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Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
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1

Bispectral Analysis of Energy Transfer within the Two-Dimensional Oceanic Internal Wave Field  

Science Journals Connector (OSTI)

Bispectral analysis of the numerically reproduced spectral responses of the two-dimensional oceanic internal wave field to the incidence of the low-mode semidiurnal internal tide is performed. At latitudes just equatorward of 30°, the low-mode ...

Naoki Furuichi; Toshiyuki Hibiya; Yoshihiro Niwa

2005-11-01T23:59:59.000Z

2

USE OF A SPATIALLY ADAPTIVE THRESHOLDING METHOD FOR THE CONDITION MONITORING OF A WIND TURBINE GEARBOX  

E-Print Network (OSTI)

USE OF A SPATIALLY ADAPTIVE THRESHOLDING METHOD FOR THE CONDITION MONITORING OF A WIND TURBINE.Antoniadou@sheffield.ac.uk ABSTRACT Condition monitoring of wind turbine gearboxes is an important practice in order to de- termine the state of the wind turbine drivetrain. In this way reparative actions could be taken whenever needed

Boyer, Edmond

3

Standard Test Method for Measurement of Hydrogen Embrittlement Threshold in Steel by the Incremental Step Loading Technique  

E-Print Network (OSTI)

1.1 This test method establishes a procedure to measure the susceptibility of steel to a time-delayed failure such as that caused by hydrogen. It does so by measuring the threshold for the onset of subcritical crack growth using standard fracture mechanics specimens, irregular-shaped specimens such as notched round bars, or actual product such as fasteners (2) (threaded or unthreaded) springs or components as identified in SAE J78, J81, and J1237. 1.2 This test method is used to evaluate quantitatively: 1.2.1 The relative susceptibility of steels of different composition or a steel with different heat treatments; 1.2.2 The effect of residual hydrogen in the steel as a result of processing, such as melting, thermal mechanical working, surface treatments, coatings, and electroplating; 1.2.3 The effect of hydrogen introduced into the steel caused by external environmental sources of hydrogen, such as fluids and cleaners maintenance chemicals, petrochemical products, and galvanic coupling in an aqueous enviro...

American Society for Testing and Materials. Philadelphia

2009-01-01T23:59:59.000Z

4

Detection threshold  

Science Journals Connector (OSTI)

Detection threshold or recognition differential is defined as the signal?to?noise ratio at the beamformer output required for detection. An introduction to this topic is provided in Uricks’ Principles of Underwater Sound. The subject is frequently a source of confusion due to the multiple possible definitions of signal?to?noise ratio the effects of nonlinearities in the signal processing and the overall complexity of the sonar operators job of signal recognition in real?world clutter. In this paper a review of the basic theory of mathematical relationships are provided followed by a discussion of practical limitations in applying simple formulas to performance predictions. The relationships of detection threshold to the signal?processing approach and background?noise statistics are discussed. Active sonars in both noise and reverberation as well as passive sonars involving energy detection spectral analysis and cross correlators are discussed.

Henry Cox

1999-01-01T23:59:59.000Z

5

Predicting percolation thresholds in networks  

E-Print Network (OSTI)

We consider different methods, that do not rely on numerical simulations of the percolation process, to approximate percolation thresholds in networks. We perform a systematic analysis on synthetic graphs and a collection of 109 real networks to quantify their effectiveness and reliability as prediction tools. Our study reveals that the inverse of the largest eigenvalue of the non-backtracking matrix of the graph often provides a tight lower bound for true percolation threshold. However, in more than 40% of the cases, this indicator is less predictive than the naive expectation value based solely on the moments of the degree distribution. We find that the performance of all indicators becomes worse as the value of the true percolation threshold grows. Thus, none of them represents a good proxy for robustness of extremely fragile networks.

Radicchi, Filippo

2014-01-01T23:59:59.000Z

6

Vibration intensity difference thresholds.  

E-Print Network (OSTI)

??The intensity difference threshold is defined as ‘the difference in the intensity of two stimuli which is just sufficient for their difference to be detected’.… (more)

Forta, Nazim Gizem

2009-01-01T23:59:59.000Z

7

Hydrogen Threshold Cost Calculation  

NLE Websites -- All DOE Office Websites (Extended Search)

Program Record (Offices of Fuel Cell Technologies) Program Record (Offices of Fuel Cell Technologies) Record #: 11007 Date: March 25, 2011 Title: Hydrogen Threshold Cost Calculation Originator: Mark Ruth & Fred Joseck Approved by: Sunita Satyapal Date: March 24, 2011 Description: The hydrogen threshold cost is defined as the hydrogen cost in the range of $2.00-$4.00/gge (2007$) which represents the cost at which hydrogen fuel cell electric vehicles (FCEVs) are projected to become competitive on a cost per mile basis with the competing vehicles [gasoline in hybrid-electric vehicles (HEVs)] in 2020. This record documents the methodology and assumptions used to calculate that threshold cost. Principles: The cost threshold analysis is a "top-down" analysis of the cost at which hydrogen would be

8

Efficient threshold cryptosystems  

E-Print Network (OSTI)

A threshold signature or decryption scheme is a distributed implementation of a cryptosystem, in which the secret key is secret-shared among a group of servers. These servers can then sign or decrypt messages by following ...

Jarecki, Stanisł aw (Stanisł aw Michal), 1971-

2001-01-01T23:59:59.000Z

9

Hydrogen Threshold Cost Calculation | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Hydrogen Threshold Cost Calculation Hydrogen Threshold Cost Calculation DOE Hydrogen Program Record number11007, Hydrogen Threshold Cost Calculation, documents the methodology and...

10

Kitaev's Zd-code threshold estimates  

Science Journals Connector (OSTI)

We study the quantum error correction threshold of Kitaev's toric code over the group Zd subject to a generalized bit-flip noise. This problem requires special decoding techniques, and for this purpose we generalize the renormalization-group method we introduced previously [G. Duclos-Cianci and D. Poulin, Phys. Rev. Lett. 104, 050504 (2010) and IEEE Information Theory Workshop, Dublin (2010), p. 1] for Z2 topological codes.

Guillaume Duclos-Cianci and David Poulin

2013-06-27T23:59:59.000Z

11

Threshold voltage extraction circuit  

E-Print Network (OSTI)

=Vos* (point of inflection in t/In-V&s), the drain current flowing in M2 and Ml would correspond to the square-law current equation of In; ? (kp/2);(W/L)i (Vcs; ? Vr) . (17) Thus, 4Im = Im and t/Inz/VIm ? 0. 5. By plotting the graph of ratio t... can also be expressed as VGS2 VGS/ slope = ~ (4) Let 4~ = I then t//t ? 2I, then by equating (3) and (4), Vr can be obtained with a simple expression as Vr = 2Vost ? Vcr. Linear Extrapolation Method This method is similar...

Hoon, Siew Kuok

2012-06-07T23:59:59.000Z

12

MACHINE MONITORING USING PROBABILITY THRESHOLDS  

E-Print Network (OSTI)

MACHINE MONITORING USING PROBABILITY THRESHOLDS AND SYSTEM OPERATING CHARACTERISTICS Stephen M a discrete-part production machine, with the objective of effectively determining when to shut the machine analysis: a) There is an underlying time interval that characterizes the operation of the machine, most

Pollock, Stephen

13

Embracing thresholds for better environmental management  

Science Journals Connector (OSTI)

...Threshold-based resource management: a framework for comprehensive ecosystem management. Environ. Manage...J. 1990 Threshold management policies for exploited...2007 A diagnostic approach for going beyond panaceas...social-ecological systems. Science 325, 419-422...

2015-01-01T23:59:59.000Z

14

Photo-Ionization of Molecules near Threshold  

Science Journals Connector (OSTI)

An orthogonalized Coulomb-wave method for the construction of continuum wave functions of molecules is described. Hydrogenic functions of definite angular momentum, which transform according to the irreducible representations of the point group of the molecule, are phenomenologically used as trial functions. Corrections to the trial functions are made by orthogonalizing them to charge rearrangement states of the molecule. The photo-ionization cross section is obtained by summing over the asymptotic angular-momentum quantum number. The method is exemplified by calculation of the photo-ionization cross sections of the ground and first excited states of the anthracene molecule in the range of 1.5 eV above threshold.

John P. Hernandez

1968-03-05T23:59:59.000Z

15

Compositional threshold for Nuclear Waste Glass Durability  

SciTech Connect

Within the composition space of glasses, a distinct threshold appears to exist that separates "good" glasses, i.e., those which are sufficiently durable, from "bad" glasses of a low durability. The objective of our research is to clarify the origin of this threshold by exploring the relationship between glass composition, glass structure and chemical durability around the threshold region.

Kruger, Albert A. [Pacific Northwest National Lab., Richland, WA (United States); Farooqi, Rahmatullah [Pohang Univ. of Science and Technology, (Korea, Republic of); Hrma, Pavel R. [Pacific Northwest National Lab., Richland, WA (United States), Pohang Univ. of Science and Technology, (Korea, Republic of)

2013-04-24T23:59:59.000Z

16

Near-threshold positron impact ionization of hydrogen  

SciTech Connect

The hyperspherical hidden crossing method (HHCM) is used to investigate positron impact ionization of hydrogen near threshold. An important feature of this method is that it can provide valuable insight into scattering processes. In the calculation of positron-hydrogen ionization, the adiabatic Hamiltonian is expanded about the Wannier saddle point; anharmonic corrections are treated perturbatively. The S-wave results are consistent with the Wannier threshold law and with the extended threshold law that was previously derived using the HHCM. We have extended the previous HHCM calculation to higher angular momenta L and have calculated the absolute ionization cross-section for L = 0, 1 and 2. The HHCM calculation confirms that the S-wave ionization cross-section is small and provides the reason why it is small. The HHCM ionization cross-section (summed over the lowest partial waves) is compared with a convergent close-coupling calculation, a 33-state close-coupling calculation and experimental data.

Macek, Joseph H [ORNL; Ward, S.J. [University of North Texas; Jansen, Krista [University of North Texas; Shertzer, J. [College Holy Cross, Worcester, MA

2008-01-01T23:59:59.000Z

17

Rotationally resolved threshold photoionization of H{sub 2}S  

SciTech Connect

With the recent development of zero kinetic energy threshold photoelectron spectroscopy (ZEKE-PES) it is now possible to take advantage of the high resolution capabilities of laser radiation and measure the rotational distributions of many small cations produced via photoionization. We have used threshold photoelectron spectroscopy in conjunction with a VUV laser source to probe the rotational distributions of several molecular cations following one- photon VUV photoionization. Spectra are obtained by the delayed, pulsed field ionization (PFI) method which is a variant of the ZEKE- PES technique. In this paper, we report on the rotationally-resolved threshold photoelectron spectra of the non-linear triatomic H{sub 2}S. These measurements are an extension of our earlier study on H{sub 2}O which provided the first look at the symmetry properties of allowed rotational transitions in the photoionization of non-linear molecules.

Wiedmann, R.T.; White, M.G.

1991-12-31T23:59:59.000Z

18

Rotationally resolved threshold photoionization of H sub 2 S  

SciTech Connect

With the recent development of zero kinetic energy threshold photoelectron spectroscopy (ZEKE-PES) it is now possible to take advantage of the high resolution capabilities of laser radiation and measure the rotational distributions of many small cations produced via photoionization. We have used threshold photoelectron spectroscopy in conjunction with a VUV laser source to probe the rotational distributions of several molecular cations following one- photon VUV photoionization. Spectra are obtained by the delayed, pulsed field ionization (PFI) method which is a variant of the ZEKE- PES technique. In this paper, we report on the rotationally-resolved threshold photoelectron spectra of the non-linear triatomic H{sub 2}S. These measurements are an extension of our earlier study on H{sub 2}O which provided the first look at the symmetry properties of allowed rotational transitions in the photoionization of non-linear molecules.

Wiedmann, R.T.; White, M.G.

1991-01-01T23:59:59.000Z

19

CABLE TECHNOLOGY LABORATORIES, INC. DETERMINATION OF THRESHOLD...  

Office of Scientific and Technical Information (OSTI)

CABLE TECHNOLOGY LABORATORIES, INC. DETERMINATION OF THRESHOLD AND MAXIMUM OPERATING ELECTRIC STRESSES FOR SELECTED HIGH VOLTAGE INSULATIONS Investigation of Aged Polymeric...

20

Threshold 21 Model | Open Energy Information  

Open Energy Info (EERE)

Threshold 21 Model Threshold 21 Model Jump to: navigation, search LEDSGP green logo.png FIND MORE DIA TOOLS This tool is part of the Development Impacts Assessment (DIA) Toolkit from the LEDS Global Partnership. Tool Summary LAUNCH TOOL Name: Threshold 21 Model Agency/Company /Organization: Millennium Institute Sector: Climate Topics: Co-benefits assessment, - Macroeconomic, Pathways analysis Resource Type: Software/modeling tools Complexity/Ease of Use: Moderate Website: www.millenniuminstitute.net/integrated_planning/tools/T21/index.html#r Cost: Free Threshold 21 Model Screenshot References: Threshold 21 Model[1] Related Tools MIT Emissions Prediction and Policy Analysis (EPPA) Model Global Atmospheric Pollution Forum Air Pollutant Emission Inventory Electricity Markets Analysis (EMA) Model

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Ionization threshold of crystalline LiF  

Science Journals Connector (OSTI)

The ionization threshold for crystalline LiF is calculated using a cluster embedded model. The experimental ionization threshold is 9.8 eV; however, previous band and cluster model calculations gave 14–15 eV. These earlier calculations used a crystal having a perfect lattice. In the present work, a crystal with lattice defects is introduced. The calculated surface and bulk ionization thresholds are 8.1 and 8.7 eV, respectively, showing good correspondence with experiment. The electron affinity and other band parameters are also studied.

Hiroshi Tatewaki

1999-08-01T23:59:59.000Z

22

Definition: Curtailment Threshold | Open Energy Information  

Open Energy Info (EERE)

Curtailment Threshold Curtailment Threshold Jump to: navigation, search Dictionary.png Curtailment Threshold The minimum Transfer Distribution Factor which, if exceeded, will subject an Interchange Transaction to curtailment to relieve a transmission facility constraint.[1] Related Terms transmission lines, Distribution Factor, transmission line References ↑ Glossary of Terms Used in Reliability Standards An in LikeLike UnlikeLike You like this.Sign Up to see what your friends like. line Glossary Definition Retrieved from "http://en.openei.org/w/index.php?title=Definition:Curtailment_Threshold&oldid=480338" Categories: Definitions ISGAN Definitions What links here Related changes Special pages Printable version Permanent link Browse properties 429 Throttled (bot load) Error 429 Throttled (bot load)

23

Initiation Pressure Thresholds from Three Sources  

SciTech Connect

Pressure thresholds are minimum pressures needed to start explosive initiation that ends in detonation. We obtain pressure thresholds from three sources. Run-to-detonation times are the poorest source but the fitting of a function gives rough results. Flyer-induced initiation gives the best results because the initial conditions are the best known. However, very thick flyers are needed to give the lowest, asymptotic pressure thresholds used in modern models and this kind of data is rarely available. Gap test data is in much larger supply but the various test sizes and materials are confusing. We find that explosive pressures are almost the same if the distance in the gap test spacers are in units of donor explosive radius. Calculated half-width time pulses in the spacers may be used to create a pressure-time curve similar to that of the flyers. The very-large Eglin gap tests give asymptotic thresholds comparable to extrapolated flyer results. The three sources are assembled into a much-expanded set of near-asymptotic pressure thresholds. These thresholds vary greatly with density: for TATB/LX-17/PBX 9502, we find values of 4.9 and 8.7 GPa at 1.80 and 1.90 g/cm{sup 3}, respectively.

Souers, P C; Vitello, P

2007-02-28T23:59:59.000Z

24

Making Diagnostic Thresholds Less Arbitrary  

E-Print Network (OSTI)

more than words can express. vi NOMENCLATURE 2PL Two-Parameter Logistic DSM-IV-TR Diagnostic and Statistical Manual of Mental Disorders, 4th Edition, Text Revision GAF Global Assessment of Functioning ICC Item Characteristic Curve IRT... Item Response Theory MAP maximum a posteriori MIDAS Methods to Improve Diagnostic and Assessment Services Database PD/PDs Personality Disorder/Personality Disorders SIDP-IV Structured Interview for DSM-IV Personality vii TABLE OF CONTENTS...

Unger, Alexis Ariana

2012-07-16T23:59:59.000Z

25

GC GUIDANCE ON MINOR CONSTRUCTION THRESHOLDS  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

GUIDANCE GUIDANCE ON MINOR CONSTRUCTION THRESHOLDS We have been asked about how the Department implements what is known as the "minor construction threshold," which limits the amount of certain funds that can be spent on minor construction projects that are not specifically authorized by law. This Guidance is intended to clarify both the applicable law and Department policy. The Secretary's authority to carry out construction projects is subject to several limitations in the Atomic Energy Defense Act (AEDA) on the use of funds appropriated for DOE national security programs. One of these limitations, the "minor construction threshold," caps the amount of "operation and maintenance funds" or "facilities and "infrastructure funds authorized by a DOE

26

L-H Threshold Studies in NSTX  

SciTech Connect

Recent experiments in the low aspect ratio National Spherical Torus Experiment (NSTX) have been run in support of the high priority ITER and ITPA issue of access to the H-mode. Specifically, a series of experiments showed reduced power threshold values for deuterium vs helium plasmas, and for plasmas with lower current, lower triangularity and with lithium conditioning. Application of n=3 fields at the plasma edge resulted in higher power thresholds. To within the constraints of temporal and spatial resolutions, no systematic difference in T{sub e}, n{sub e}, p{sub e}, T{sub i}, v or their derivatives was found in discharges that transitioned into the H-mode versus those at slightly lower power that did not. Finally, H{sub 98y,2} {approx} 1 confinement quality could be achieved for powers just above the threshold power in ELM-free conditions.

Kaye, S M; Battaglia, D; Bell, R E; Chang, C S; Hosea, J; Kugel, H; LeBlanc, B P; Meyer, H; Park, G Y

2011-09-06T23:59:59.000Z

27

L-H Threshold Studies in NSTX  

SciTech Connect

Recent experiments in the low aspect ratio National Spherical Torus Experiment (NSTX) have been run in support of the high priority ITER and ITPA issue of access to the H-mode. Specifically, a series of experiments showed reduced power threshold values for deuterium versus helium plasmas, and for plasmas with lower current, lower triangularity and with lithium conditioning. Application of n = 3 fields at the plasma edge resulted in higher power thresholds. To within the constraints of temporal and spatial resolutions, no systematic difference in T(e), n(e), p(e), T(i), v or their derivatives was found in discharges that transitioned into the H-mode versus those at slightly lower power that did not. Finally, H(98y,2) similar to 1 confinement quality could be achieved for powers just above the threshold power in ELM-free conditions.

Kaye, S. M. [Princeton Plasma Physics Laboratory (PPPL); Maingi, Rajesh [ORNL; Battaglia, D. J. [Oak Ridge National Laboratory (ORNL); Bell, R. E. [Princeton Plasma Physics Laboratory (PPPL); Chang, C. S. [Princeton Plasma Physics Laboratory (PPPL); Hosea, J. [Princeton Plasma Physics Laboratory (PPPL); Kugel, H. W. [Princeton Plasma Physics Laboratory (PPPL); LaBlanc, B. P. [Princeton Plasma Physics Laboratory (PPPL); Meyer, H. [EURATOM / UKAEA, UK; Park, G-Y. [New York University; Wilson, J. R. [Princeton Plasma Physics Laboratory (PPPL)

2011-01-01T23:59:59.000Z

28

Pressure Systems Stored-Energy Threshold Risk Analysis  

SciTech Connect

Federal Regulation 10 CFR 851, which became effective February 2007, brought to light potential weaknesses regarding the Pressure Safety Program at the Pacific Northwest National Laboratory (PNNL). The definition of a pressure system in 10 CFR 851 does not contain a limit based upon pressure or any other criteria. Therefore, the need for a method to determine an appropriate risk-based hazard level for pressure safety was identified. The Laboratory has historically used a stored energy of 1000 lbf-ft to define a pressure hazard; however, an analytical basis for this value had not been documented. This document establishes the technical basis by evaluating the use of stored energy as an appropriate criterion to establish a pressure hazard, exploring a suitable risk threshold for pressure hazards, and reviewing the methods used to determine stored energy. The literature review and technical analysis concludes the use of stored energy as a method for determining a potential risk, the 1000 lbf-ft threshold, and the methods used by PNNL to calculate stored energy are all appropriate. Recommendations for further program improvements are also discussed

Paulsen, Samuel S.

2009-08-25T23:59:59.000Z

29

Threshold singularities and Gribov's Reggeon calculus  

Science Journals Connector (OSTI)

Within the framework of Gribov's Reggeon calculus we study the influence of the two-pion threshold on the Pomeron trajectory. We point out that in order to obtain a physically meaningful result, it is important to know which Reggeon-Reggeon-particle-particle partial-wave amplitudes can be taken to be constants.

F. Hayot

1974-10-15T23:59:59.000Z

30

Threshold LET for SEU induced by low energy ions  

SciTech Connect

Simulations to determine the threshold LET as a function of the length of the ion track are consistent with there being two regions of charge collection. In the top layer which contains the depletion region all the charge generated is collected in time to upset the device. In the next layer, 10% to 20% of the charge generated is collected and contributes to upsetting the device. This second layer of partial charge collection may significantly impact the accuracy of SEU predictions involving low-energy neutrons and protons. A simple method of including this contribution in calculations is proposed.

McNulty, P.J.; Roche, P.; Palau, J.M.; Gasiot, J.

1999-12-01T23:59:59.000Z

31

Reduce Threshold for Toplit Daylighting Area  

NLE Websites -- All DOE Office Websites (Extended Search)

Supporting analysis for proposed Supporting analysis for proposed changes to the commercial provisions of the 2012 IECC: Reduce Threshold for Toplit Daylighting Area R Hart R Athalye Pacific Northwest National Laboratory December 2012 2 Proposal Description This proposal modifies Section C402.3.2 of the 2012 IECC for the 2015 version. It reduces the area threshold for skylight daylit zones from 10,000 square feet to 2,000 square feet. It maintains 15 foot ceiling height requirement and the exception for climate zones 6 through 8. Energy Impact Based on average national energy prices 1 of $0.99 per therm and $0.1032 per kWh, the net savings are calculated with EnergyPlus(tm) 2 from whole building energy savings that result from reduced lighting, and depending on climate zone, increased or decreased heating and cooling.

32

Power threshold for neutral beam current drive  

SciTech Connect

For fully noninductive current drive in tokamaks using neutral beams, there is a power and density threshold condition, setting a minimum value for P{sup 3/2}/n{sup 2}. If this condition is not met, stationary state cannot occur, and a tokamak discharge will collapse. This is a consequence of the coupling between current and electron temperature, or between current drive efficiency and energy confinement time. 4 figs.

Politzer, P.A. (General Atomics, San Diego, CA (USA)); Porter, G.D. (Lawrence Livermore National Lab., CA (USA))

1989-10-02T23:59:59.000Z

33

Distribution of sensory taste thresholds for phenylthiocarbamide (PTC) taste ability in North Indian Muslim populations  

Science Journals Connector (OSTI)

Abstract The ability to taste Phenylthiocarbamide (PTC), a bitter organic compound has been described as a bimodal autosomal trait in both genetic and anthropological studies. This study is based on the ability of a person to taste PTC. The present study reports the threshold distribution of PTC taste sensitivity among some Muslim populations of North India, as till now no detailed information is available. A survey was conducted among healthy individuals within the age range of 10–45 years who were randomly selected from among six populations viz; Syed, Sheikh, Pathan, Ansari, Qureshi and Saifi. The PTC tasting ability was measured using a serial dilution method of Harris and Kalmus. A bimodal distribution was observed from the graphs plotted for the PTC threshold distribution. The mean PTC threshold values (±SD) of the male and female individuals were calculated as 8.12 ± 0.21 and 8.39 ± 0.20, respectively. The threshold values among the six populations ranged from 7.71 to 8.81 among males, 7.44–9.04 among females and 7.86–8.91 as combined. The results found that females show a higher mean threshold value than males, though of no statistical significance. This type of study will provide brief information on the distribution of PTC sensory thresholds among some Muslim populations of North India. This study has some physiological relevance to highlight the adaptability of endogamous groups to behavioral traits in the same place.

Ruqaiya Hussain; Ahsana Shah; Mohammad Afzal

2013-01-01T23:59:59.000Z

34

Category 3 threshold quantities for hazard categorization of nonreactor facilities  

SciTech Connect

This document provides the information necessary to determine Hazard Category 3 threshold quantities for those isotopes of interest not listed in WHC-CM-4-46, Section 4, Table 1.''Threshold Quantities.''

Mandigo, R.L.

1996-02-13T23:59:59.000Z

35

Motion thresholds can be predicted from contrast discrimination  

E-Print Network (OSTI)

and flicker thresholds for suprathreshold sinusoidal gratings are similar. This finding sup- ports the idea are slightly higher than jitter thresholds indicates that the contrast gain control (or satu- rating energy

Klein, Stanley

36

Threshold resummed spectra in semi-inclusive B decays  

E-Print Network (OSTI)

I discuss some aspects of the universality of soft gluon dynamics in semileptonic and radiative decays at the threshold region.

Giulia Ricciardi

2006-07-05T23:59:59.000Z

37

VINYL CHLORIDE ACUTE TOXICITY THRESHOLDS IN THE CONTEXT OF CONTROLLING  

E-Print Network (OSTI)

. The "irreversible effects threshold" is the maximum concentration of pollutant in the air for a given exposure timeVINYL CHLORIDE ACUTE TOXICITY THRESHOLDS IN THE CONTEXT OF CONTROLLING URBAN DEVELOPMENT OR LAND of vinyl Chloride , the french procedure to set acute toxicity thresholds in the context of controlling

Boyer, Edmond

38

Empirical Bayes approach to improve wavelet thresholding for image noise  

E-Print Network (OSTI)

Empirical Bayes approach to improve wavelet thresholding for image noise reduction Maarten Jansen thresholding for image noise reduction Maarten Jansen Adhemar Bultheel Report TW 296, October 1999 Department to improve wavelet thresholding for image noise reduction Maarten Jansen and Adhemar Bultheel Department

Jansen, Maarten

39

No Evidence of Dioxin Cancer Threshold David Mackie1  

E-Print Network (OSTI)

1 No Evidence of Dioxin Cancer Threshold David Mackie1 , Junfeng Liu1 , Yeong-Shang Loh2 , Valerie Environmental Institute, Guyot Hall, Princeton University, Princeton NJ 08544 #12;2 No Evidence of Dioxin Cancer Threshold Key Words: Dioxin, TCDD, Cancer, Threshold Acknowledgements: This work was carried out as part

Thomas, Valerie

40

Trapping volumetric measurement by multidetector CT in chronic obstructive pulmonary disease: Effect of CT threshold  

SciTech Connect

Purpose: The purpose of this study was to evaluate the effect of various computed tomography (CT) thresholds on trapping volumetric measurements by multidetector CT in chronic obstructive pulmonary disease (COPD).Methods: Twenty-three COPD patients were scanned with a 64-slice CT scanner in both the inspiratory and expiratory phase. CT thresholds of ?950 Hu in inspiration and ?950 to ?890 Hu in expiration were used, after which trapping volumetric measurements were made using computer software. Trapping volume percentage (Vtrap%) under the different CT thresholds in the expiratory phase and below ?950 Hu in the inspiratory phase was compared and correlated with lung function.Results: Mean Vtrap% was similar under ?930 Hu in the expiratory phase and below ?950 Hu in the inspiratory phase, being 13.18 ± 9.66 and 13.95 ± 6.72 (both lungs), respectively; this difference was not significant (P= 0.240). Vtrap% under ?950 Hu in the inspiratory phase and below the ?950 to ?890 Hu threshold in the expiratory phase was moderately negatively correlated with the ratio of forced expiratory volume in one second to forced vital capacity and the measured value of forced expiratory volume in one second as a percentage of the predicted value.Conclusions: Trapping volumetric measurement with multidetector CT is a promising method for the quantification of COPD. It is important to know the effect of various CT thresholds on trapping volumetric measurements.

Wang, Xiaohua; Yuan, Huishu [Department of Radiology, Peking University Third Hospital, Beijing 100191 (China)] [Department of Radiology, Peking University Third Hospital, Beijing 100191 (China); Duan, Jianghui [Medical School, Peking University, Beijing 100191 (China)] [Medical School, Peking University, Beijing 100191 (China); Du, Yipeng; Shen, Ning; He, Bei [Department of Respiration Internal Medicine, Peking University Third Hospital, Beijing 100191 (China)] [Department of Respiration Internal Medicine, Peking University Third Hospital, Beijing 100191 (China)

2013-08-15T23:59:59.000Z

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Rebate rules in threshold public good provision  

Science Journals Connector (OSTI)

This paper considers how six alternative rebate rules affect voluntary contributions in a threshold public-good experiment. The rules differ by (1) whether an individual can receive a proportional rebate of excess contributions, a winner-takes-all of any excess contributions, or a full rebate of one's contribution in the event the public good is provided and excess contributions exist, and (2) whether the probability of receiving a rebate is proportional to an individual's contribution relative to total contributions or is a simple uniform probability distribution set by the number of contributors. The paper adds to the existing experimental economics literature on threshold public goods by investigating both aggregate and individual demand revelation under the winner-take-all and random full-rebate rules. Half of the rules (proportional rebate, winner-take-all with uniform probability among all group members, and random full-rebate with uniform probability) provide total contributions that nearly equal total benefits, while the rest (winner-take-all with proportional probability, winner-take-all with uniform probability among contributors only, and random full-rebate with proportional probability) exceed benefits by over 30%. Only the proportional rebate rule is found to achieve both aggregate and individual demand revelation. Our experimental results have implications for both fundraisers and valuation practitioners.

Michael A. Spencer; Stephen K. Swallow; Jason F. Shogren; John A. List

2009-01-01T23:59:59.000Z

42

Photo-Electric Thresholds and Fatigue  

Science Journals Connector (OSTI)

Photo-electric fatigue.—Using elements of the highest purity, clean surfaces were prepared, in a vacuum of the order of 10-6 mm of Hg, by means of an electromagnetic filing device. A linear relation was found between the logarithm of the photo-electric current and the logarithm of the time elapsed since polishing the specimen. The rate of fatigue depends upon the element used and the factors which produce fatigue and, for a given substance, increases numerically as the threshold is approached. Increasing the pressure increases the rate of fatigue. The action of light has a negligible effect.Photo-electric thresholds.—The values for Ca, Fe, Co, Ni, Cu, Zn, and Ge are, respectively, 4475, 3155, 3165, 3040, 2955, 3180, and 2880A. Within a period of several hours at least photo-electric fatigue causes no change in these values when a high vacuum is used. Evidence for a shift towards shorter wave-lengths is obtained for lower vacua.The "patch" theory.—A theory in which contamination takes place at discrete areas of the surface of the element is proposed to account for the experimental facts obtained.

George B. Welch

1928-10-01T23:59:59.000Z

43

Speech Recognition, Using Analog Threshold Logic  

Science Journals Connector (OSTI)

A speech?analysis system using analog threshold logic (ATL) for feature abstraction is being developed to recognize consonants in utterances of CVC words by a number of talkers. The ATL element originally modeled after the biological neuron has an output that is linearly proportional to the net sum of excitatory and inhibitory inputs provided that this net sum is greater than some adjustable threshold. The speech?analysis system abstracts relatively steady?state as well as transient features over almost 60 dB of dynamic range from the logarithmitized outputs of 19 low?Q filters. Feature abstraction takes place in real time does not require segmentation utilizes parallel processing and provides information about both the presence and magnitude of the frequency?energy?temporal characteristics of speech sounds. Many features corresponding to results of speech?recognition experiments described in the literature have been automatically abstracted by ATL networks which measure the slope of the spectral envelope in real time. Using the experimental system recognition scores in the range of 82%–99% were obtained for 16 consonants. Results for the fricative consonants are discussed and some of their invariant features described. [Work supported by the U. S. Air Force Research and Technology Division Air Force Avionics Laboratory.

T. B. Martin; H. J. Zadell; A. L. Nelson; M. B. Herscher

1964-01-01T23:59:59.000Z

44

Superlinear threshold detectors in quantum cryptography  

SciTech Connect

We introduce the concept of a superlinear threshold detector, a detector that has a higher probability to detect multiple photons if it receives them simultaneously rather than at separate times. Highly superlinear threshold detectors in quantum key distribution systems allow eavesdropping the full secret key without being revealed. Here, we generalize the detector control attack, and analyze how it performs against quantum key distribution systems with moderately superlinear detectors. We quantify the superlinearity in superconducting single-photon detectors based on earlier published data, and gated avalanche photodiode detectors based on our own measurements. The analysis shows that quantum key distribution systems using detector(s) of either type can be vulnerable to eavesdropping. The avalanche photodiode detector becomes superlinear toward the end of the gate. For systems expecting substantial loss, or for systems not monitoring loss, this would allow eavesdropping using trigger pulses containing less than 120 photons per pulse. Such an attack would be virtually impossible to catch with an optical power meter at the receiver entrance.

Lydersen, Lars; Maroey, Oystein; Skaar, Johannes; Makarov, Vadim [Department of Electronics and Telecommunications, Norwegian University of Science and Technology, NO-7491 Trondheim (Norway); University Graduate Center, NO-2027 Kjeller (Norway); Jain, Nitin; Wittmann, Christoffer; Marquardt, Christoph; Leuchs, Gerd [Max Planck Institute for the Science of Light, Guenther-Scharowsky-Strasse 1/Bau 24, DE-91058 Erlangen (Germany); Institut fuer Optik, Information und Photonik, University of Erlangen-Nuremberg, Staudtstrasse 7/B2, DE-91058 Erlangen (Germany)

2011-09-15T23:59:59.000Z

45

Heart Rate Variability Analysis Using Threshold of Wavelet Package Coefficients  

E-Print Network (OSTI)

In this paper, a new efficient feature extraction method based on the adaptive threshold of wavelet package coefficients is presented. This paper especially deals with the assessment of autonomic nervous system using the background variation of the signal Heart Rate Variability HRV extracted from the wavelet package coefficients. The application of a wavelet package transform allows us to obtain a time-frequency representation of the signal, which provides better insight in the frequency distribution of the signal with time. A 6 level decomposition of HRV was achieved with db4 as mother wavelet, and the above two bands LF and HF were combined in 12 specialized frequencies sub-bands obtained in wavelet package transform. Features extracted from these coefficients can efficiently represent the characteristics of the original signal. ANOVA statistical test is used for the evaluation of proposed algorithm.

Kheder, G; Massoued, M Ben; Samet, M

2009-01-01T23:59:59.000Z

46

Absolute cross section for positron-impact ionization of hydrogen near threshold  

SciTech Connect

We investigate positron-impact ionization of hydrogen near threshold using the hyperspherical hidden crossing method (HHCM). Previously, Ihra et al. Phys. Rev. Lett. 78 4027 (1997) used the HHCM to obtain the extended Wannier threshold law for zero angular momentum. We extend their analysis to higher angular momentum L and show that the extended Wannier threshold law is L independent. We also calculate the absolute partial-wave ionization cross sections for L=0, 1, 2, and 3 and compare our results with other calculations and with experimental measurements. The HHCM calculation provides an explanation for the very small S-wave and large D-wave contributions to the ionization cross section in terms of destructive and constructive interference, respectively.

Jansen, Krista [University of North Texas; Ward, S.J. [University of North Texas; Macek, Joseph H [ORNL

2009-01-01T23:59:59.000Z

47

Detection of lactate threshold by including haemodynamic and oxygen extraction data  

Science Journals Connector (OSTI)

To date, few attempts have been made to correlate cardiovascular variables to lactate threshold (LT). This study was designed to determine the relationship between the accumulation of blood lactate and several haemodynamic variables during exercise. Eight male volunteer cyclists performed an incremental test on an electromagnetically braked cycle-ergometer consisting of a 50 W linear increase in workload every 3 min up to exhaustion. Blood lactate was measured with a portable analyser during each exercise step. Oxygen consumption (VO2) and pulmonary ventilation were measured by means of a mass spectrometer while heart rate, stroke volume and cardiac output (CO) were assessed by impedance cardiography. The arterio-venous oxygen difference (A-V O2 Diff) was obtained by dividing VO2 by CO. By applying the Dmax mathematical method, LT and thresholds of ventilatory and haemodynamic parameters were calculated. The Bland and Altman statistics used to assess agreement between two methods of measurement were applied in order to evaluate the agreement between LT and thresholds derived from ventilatory and haemodynamic data. The main result was that most of the haemodynamic variables did not provide thresholds which could be used interchangeably with LT. Only the threshold of A-V O2 Diff showed mean values that were no different compared to LT together with limits of agreement that were not very wide between thresholds (below ±25%). Hence of the haemodynamic parameters, A-V O2 Diff appears to be the one most closely coupled with lactate accumulation and consequently it is also the most suitable for non-invasive calculation of the LT.

Antonio Crisafulli; Filippo Tocco; Gianluigi Pittau; Marcello Caria; Luigi Lorrai; Franco Melis; Alberto Concu

2006-01-01T23:59:59.000Z

48

Human Contrast Threshold and Astronomical Visibility  

E-Print Network (OSTI)

The standard visibility model in light pollution studies is the formula of Hecht (1947), as used e.g. by Schaefer (1990). However it is applicable only to point sources and is shown to be of limited accuracy. A new visibility model is presented for uniform achromatic targets of any size against background luminances ranging from zero to full daylight, produced by a systematic procedure applicable to any appropriate data set (e.g Blackwell (1946)), and based on a simple but previously unrecognized empirical relation between contrast threshold and adaptation luminance. The scotopic luminance correction for variable spectral radiance (colour index) is calculated. For point sources the model is more accurate than Hecht's formula and is verified using telescopic data collected at Mount Wilson by Bowen (1947), enabling the sky brightness at that time to be determined. The result is darker than the calculation by Garstang (2004), implying that light pollution grew more rapidly in subsequent decades than has been sup...

Crumey, Andrew

2014-01-01T23:59:59.000Z

49

Optical ranked-order filtering using threshold decomposition  

DOE Patents (OSTI)

A hybrid optical/electronic system performs median filtering and related ranked-order operations using threshold decomposition to encode the image. Threshold decomposition transforms the nonlinear neighborhood ranking operation into a linear space-invariant filtering step followed by a point-to-point threshold comparison step. Spatial multiplexing allows parallel processing of all the threshold components as well as recombination by a second linear, space-invariant filtering step. An incoherent optical correlation system performs the linear filtering, using a magneto-optic spatial light modulator as the input device and a computer-generated hologram in the filter plane. Thresholding is done electronically. By adjusting the value of the threshold, the same architecture is used to perform median, minimum, and maximum filtering of images. A totally optical system is also disclosed. 3 figs.

Allebach, J.P.; Ochoa, E.; Sweeney, D.W.

1987-10-09T23:59:59.000Z

50

Optical ranked-order filtering using threshold decomposition  

DOE Patents (OSTI)

A hybrid optical/electronic system performs median filtering and related ranked-order operations using threshold decomposition to encode the image. Threshold decomposition transforms the nonlinear neighborhood ranking operation into a linear space-invariant filtering step followed by a point-to-point threshold comparison step. Spatial multiplexing allows parallel processing of all the threshold components as well as recombination by a second linear, space-invariant filtering step. An incoherent optical correlation system performs the linear filtering, using a magneto-optic spatial light modulator as the input device and a computer-generated hologram in the filter plane. Thresholding is done electronically. By adjusting the value of the threshold, the same architecture is used to perform median, minimum, and maximum filtering of images. A totally optical system is also disclosed.

Allebach, Jan P. (West Lafayette, IN); Ochoa, Ellen (Pleasanton, CA); Sweeney, Donald W. (Alamo, CA)

1990-01-01T23:59:59.000Z

51

Optimization Online - A Counterexample to “Threshold Boolean form ...  

E-Print Network (OSTI)

Jan 2, 2015 ... Abstract: Recently, in the paper “Threshold Boolean form for joint probabilistic constraints with random technology matrix” (Math. Program.

James Luedtke

2015-01-02T23:59:59.000Z

52

Pulsed Laser Ignition Thresholds of Energetic Multilayer Foils  

Science Journals Connector (OSTI)

Ignition thresholds for energetic multilayer foils comprised of aluminum (Al) and platinum (Pt) layers are presented as a function of foil properties for laser pulse durations of 100...

McDonald, Joel P; Picard, Yoosuf N; Yalisove, Steven M; Adams, David P

53

Photo-Neutron Thresholds of Beryllium and Deuterium  

Science Journals Connector (OSTI)

The photo-neutron thresholds of beryllium and deuterium have been measured by comparison with the Li7(p,n) threshold. For this purpose an electrostatic generator was used in which an electron beam and a positive ion beam were established simultaneously. Accurate control and measurement of the generator voltage was obtained by using an electrostatic analyzer on the H2+ component of the ion beam. Because the Li7(p,n) threshold lies between the Be9(?,n) and D(?,n) thresholds, errors in extrapolation should be small. The electron beam was accelerated from ground to the accurately known potential of the high voltage electrode where x-rays were produced for the photo-disintegration process. From the photo-neutron thresholds the neutron binding energies of beryllium and deuterium were found to be 1.666±0.002 and 2.226±0.003 Mev, respectively.

R. C. Mobley and R. A. Laubenstein

1950-11-01T23:59:59.000Z

54

Energy Dependence of Cross Sections near Threshold: One Neutral and Two Charged Reaction Products  

Science Journals Connector (OSTI)

The energy dependence near threshold of cross sections for reactions leading to the escape of one neutral and two charged particles is determined. The method is an extension of one developed previously for uncharged particles, and utilizes only general properties of solutions of the time-independent three-particle Schrödinger equation valid outside a reaction zone of finite extent. Electron detachment from H- by charged particle bombardment, and nuclear reactions of the type (n, np) are considered as examples.

Robert W. Hart; Ernest P. Gray; William H. Guier

1957-12-15T23:59:59.000Z

55

Optical Damage Threshold of Silicon for Ultrafast Infrared Pulses  

SciTech Connect

While silicon has several properties making it an attractive material for structure-based laser-driven acceleration, its optical damage threshold, a key parameter for high-gradient acceleration, has been unknown. Here we present measurements of the optical damage threshold of crystalline silicon for ultrafast pulses in the mid-infrared. The wavelengths tested span a range from the telecommunications band at 1550 nm extending longer toward the two-photon absorption threshold at around 2200 nm. We discuss the prevailing theories of ultrafast optical breakdown, describe the experimental setup and preliminary results, and propose a relevant performance parameter for candidate accelerator structures.

Cowan, B.; /SLAC

2006-09-07T23:59:59.000Z

56

Continuum percolation threshold for interpenetrating squares and cubes  

Science Journals Connector (OSTI)

Monte Carlo simulations are performed to determine the critical percolation threshold for interpenetrating square objects in two dimensions and cubic objects in three dimensions. Simulations are performed for two cases: (i) objects whose edges are aligned parallel to one another and (ii) randomly oriented objects. For squares whose edges are aligned, the critical area fraction at the percolation threshold ?c=0.6666±0.0004, while for randomly oriented squares ?c=0.6254±0.0002, 6% smaller. For cubes whose edges are aligned, the critical volume fraction at the percolation threshold ?c=0.2773±0.0002, while for randomly oriented cubes ?c=0.2168±0.0002, 22% smaller.

Don R. Baker; Gerald Paul; Sameet Sreenivasan; H. Eugene Stanley

2002-10-30T23:59:59.000Z

57

Threshold Law for Attractive Inverse-Cube Interactions  

Science Journals Connector (OSTI)

For scattering by potentials with attractive inverse-cube (-C3/r3) tails, the threshold law for elastic collisions is presented. The expansion of the scattering phase shift contains all terms up to and including O(k2) and only relies on the value of the threshold quantum number’s remainder ??[0,1), which accounts for short-range deviations of the full potential from the pure -C3/r3 form. In contrast to previous approaches, the threshold law presented provides a connection to the regular solution at zero energy as well as to the position of a weakly bound s-wave state.

Tim-Oliver Müller

2013-06-24T23:59:59.000Z

58

1  

NLE Websites -- All DOE Office Websites (Extended Search)

of cloud optical depth. The bispectral method is regularly adopted by conventional weather satellites (AVHRR, GMS, GOES, METEOSAT, VIRS, etc.) because the two channels are...

59

Gelation threshold of cross-linked polymer brushes  

Science Journals Connector (OSTI)

The cross-linking of polymer brushes is studied using the bond-fluctuation model. By mapping the cross-linking process into a two-dimensional (2D) percolation problem within the lattice of grafting points, we investigate the gelation transition in detail. We show that the particular properties of cross-linked polymer brushes can be reduced to the distribution of bonds which are formed between the grafted chains, and we propose scaling arguments to relate the gelation threshold to the chain length and the grafting density. The gelation threshold is lower than the percolation threshold for 2D bond percolation because of the longer range and broad distribution of bonds formed by the cross-linking process. We term this type of percolation problem star percolation. We observe a broad crossover from mean-field to critical percolation behavior by analyzing the cluster size distribution near the gelation threshold.

Max Hoffmann; Michael Lang; Jens-Uwe Sommer

2011-02-23T23:59:59.000Z

60

Laser-Matter Interaction Above the Plasma Ignition Threshold Intensity  

Science Journals Connector (OSTI)

In this chapter we present the process of laser-matter interaction above the plasma ignition threshold intensity. The physics of the pulsed laser ablation process at high intensities is very complex since it invo...

Mihai Stafe; Aurelian Marcu; Niculae N. Puscas

2014-01-01T23:59:59.000Z

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61

Laser-Matter Interaction Below the Plasma Ignition Threshold Intensity  

Science Journals Connector (OSTI)

In this chapter we present the process of laser-matter interaction below the plasma ignition threshold intensity. When the high power laser radiation characterized by electric field intensities around ...

Mihai Stafe; Aurelian Marcu; Niculae N. Puscas

2014-01-01T23:59:59.000Z

62

A Multichannel, Variable?Threshold, Time?Sequence Recorder  

Science Journals Connector (OSTI)

The analysis and design of a ten?channel variable?threshold time?sequence recorder that uses TTL is presented. Channel?to?channel time resolution is ? 250 nsec and risetime is ? 6 usec for a 2?V p?p signal. Although the recorder is designed to examine the flux?jump phenomenon in large superconducting magnets it has application wherever variable?threshold time?sequencing is required.

Mark L. McKinstry

1973-01-01T23:59:59.000Z

63

A threshold type Cerenkov radiation detector  

E-Print Network (OSTI)

. 3 The Cerenkov cone, and the field vectors. I , "9 / / L 5! D. The General Plan c the Present Work. The intensities of high-energy cosmic ray muons are being studied at Texas Assai University. A detector that would detect only the hign-energy..., low-intensity muons in the presence of a high-intensity, low-energy component would therefore be useful. The second method described in Section I. C fulfills this requirement if a suitable radiating medium is used. Pure water has been choser...

Winningham, John David

2012-06-07T23:59:59.000Z

64

Test plan: Gas-threshold-pressure testing of the Salado Formation in the WIPP underground facility  

SciTech Connect

Performance assessment for the disposal of radioactive waste from the United States defense program in the WIPP underground facility must assess the role of post-closure was generation by waste degradation and the subsequent pressurization of the facility. be assimilated by the host formation will Whether or not the generated gas can be assimilated by the host formation will determine the ability of the gas to reach or exceed lithostatic pressure within the repository. The purpose of this test plan is (1) to present a test design to obtain realistic estimates of gas-threshold pressure for the Salado Formation WIPP underground facility including parts of the formation disturbed by the underground of the Salado, and (2) to provide a excavations and in the far-field or undisturbed part framework for changes and amendments to test objectives, practices, and procedures. Because in situ determinations of gas-threshold pressure in low-permeability media are not standard practice, the methods recommended in this testplan are adapted from permeability-testing and hydrofracture procedures. Therefore, as the gas-threshold-pressure testing program progresses, personnel assigned to the program and outside observers and reviewers will be asked for comments regarding the testing procedures. New and/or improved test procedures will be documented as amendments to this test plan, and subject to similar review procedures.

Saulnier, G.J. Jr. (INTERA, Inc., Austin, TX (United States))

1992-03-01T23:59:59.000Z

65

Multiple thresholds in a model system of noisy ion channels  

Science Journals Connector (OSTI)

Voltage-activated ion channels vary randomly between open and closed states, influenced by the membrane potential and other factors. Signal transduction is enhanced by noise in a simple ion channel model. The enhancement occurs in a finite range of signals; the range can be extended using populations of channels. The range increases more rapidly in multiple-threshold channel populations than in single-threshold populations. The diversity of ion channels may thus be present as a strategy to reduce the metabolic costs of handling a broad class of electrochemical signals.

Michael J. Barber and Manfred L. Ristig

2006-10-19T23:59:59.000Z

66

Optical Damage Threshold of Silicon for Ultrafast Infrared Pulses  

SciTech Connect

We present measurements of the optical damage threshold of crystalline silicon in air for ultrafast pulses in the near infrared. The wavelengths tested span a range from the telecommunications band at 1550 nm, extending to 2260 nm. We discuss the motivation for the measurements and give theoretical context. We then describe the experimental setup, diagnostics, and procedure. The results show a breakdown threshold of 0.2J/cm{sup 2} at 1550 nm and 1.06 ps FWHM pulse duration, and a weak dependence on wavelength.

Cowan, Benjamin M.; /Tech-X, Boulder /SLAC

2007-11-28T23:59:59.000Z

67

Low-Threshold Surface-Passivated Photonic Crystal Nanocavity Laser  

E-Print Network (OSTI)

The efficiency and operating range of a photonic crystal laser is improved by passivating the InGaAs quantum well (QW) gain medium and GaAs membrane using an (NH4)S treatment. The passivated laser shows a four-fold reduction in nonradiative surface recombination rate, resulting in a four-fold reduction in lasing threshold. A three-level carrier dynamics model explains the results and shows that lasing threshold is as much determined by surface recombination losses as by the cavity quality factor (Q). Surface passivation therefore appears crucial in operating such lasers under practical conditions.

Dirk Englund; Hatice Altug; Jelena Vuckovic

2007-03-21T23:59:59.000Z

68

Photoproduction of the omega meson off the proton near threshold  

E-Print Network (OSTI)

An experimental study of omega photoproduction off the proton has been conducted by using the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. The gp-->omega p differential cross sections are measured from threshold to the incident-photon energy Eg=1.4 GeV with ~15 MeV binning and full production-angle coverage. The quality of the present data near threshold gives access to a variety of interesting physics, including an estimation of the omegaN scattering length alpha_{omega p}.

Strakovsky, I I; Azimov, Ya I; Aguar-Bartolome, P; Annand, J R M; Arends, H J; Bantawa, K; Beck, R; Bekrenev, V; Berghaeuser, H; Braghieri, A; Briscoe, W J; Brudvik, J; Cherepnya, S; Codling, R F B; Collicott, C; Costanza, S; Demissie, B T; Downie, E J; Drexler, P; Fil'kov, L V; Glazier, D I; Gregor, R; Hamilton, D J; Heid, E; Hornidge, D; Jaegle, I; Jahn, O; Jude, T C; Kashevarov, V L; Keshelashvili, I; Kondratiev, R; Korolija, M; Kotulla, M; Koulbardis, A; Kruglov, S; Krusche, B; Lisin, V; Livingston, K; MacGregor, I J D; Maghrbi, Y; Manley, D M; Marinides, Z; McGeorge, J C; McNicoll, E F; Mekterovic, D; Metag, V; Middleton, D G; Mushkarenkov, A; Nefkens, B M K; Nikolaev, A; Novotny, R; Ortega, H; Ostrick, M; Otte, P B; Oussena, B; Pedroni, P; Pheron, F; Polonski, A; Robinson, J; Rosner, G; Rostomyan, T; Schumann, S; Sikora, M H; Starostin, A; Supek, I; Taragin, M F; Tarbert, C M; Thiel, M; Thomas, A; Unverzagt, M; Watts, D P; Werthmueller, D; Zehr, F

2014-01-01T23:59:59.000Z

69

Photoproduction of the omega meson off the proton near threshold  

E-Print Network (OSTI)

An experimental study of omega photoproduction off the proton has been conducted by using the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. The gp-->omega p differential cross sections are measured from threshold to the incident-photon energy Eg=1.4 GeV with ~15 MeV binning and full production-angle coverage. The quality of the present data near threshold gives access to a variety of interesting physics, including an estimation of the omegaN scattering length alpha_{omega p}.

I. I. Strakovsky; S. Prakhov; Ya. I. Azimov; P. Aguar-Bartolome; J. R. M. Annand; H. J. Arends; K. Bantawa; R. Beck; V. Bekrenev; H. Berghaeuser; A. Braghieri; W. J. Briscoe; J. Brudvik; S. Cherepnya; R. F. B. Codling; C. Collicott; S. Costanza; B. T. Demissie; E. J. Downie; P. Drexler; L. V. Fil'kov; D. I. Glazier; R. Gregor; D. J. Hamilton; E. Heid; D. Hornidge; I. Jaegle; O. Jahn; T. C. Jude; V. L. Kashevarov; I. Keshelashvili; R. Kondratiev; M. Korolija; M. Kotulla; A. Koulbardis; S. Kruglov; B. Krusche; V. Lisin; K. Livingston; I. J. D. MacGregor; Y. Maghrbi; D. M. Manley; Z. Marinides; J. C. McGeorge; E. F. McNicoll; D. Mekterovic; V. Metag; D. G. Middleton; A. Mushkarenkov; B. M. K. Nefkens; A. Nikolaev; R. Novotny; H. Ortega; M. Ostrick; P. B. Otte; B. Oussena; P. Pedroni; F. Pheron; A. Polonski; J. Robinson; G. Rosner; T. Rostomyan; S. Schumann; M. H. Sikora; A. Starostin; I. Supek; M. F. Taragin; C. M. Tarbert; M. Thiel; A. Thomas; M. Unverzagt; D. P. Watts; D. Werthmueller; F. Zehr

2014-07-13T23:59:59.000Z

70

Threshold resummation for Drell-Yan production: theory and phenomenology  

E-Print Network (OSTI)

We present a phenomenological study of Drell-Yan pair production at hadron colliders based on the NNLO fixed order calculation and on NNLL resummation of threshold logarithms. We give an argument to prove that resummation effects are relevant also for values of x=M^2/s far from threshold. We compare different prescriptions for the calculation of resummed quantities, emphasizing the differences coming from subleading terms, which are important when x is small. We present phenomenological predictions for Drell-Yan rapidity distributions at the LHC, we study the ambiguity related to the resummation prescription, and we compare it to that coming from scale variation.

Marco Bonvini

2010-10-09T23:59:59.000Z

71

Threshold current analysis of compressive strain (0-1. 8%) in low-threshold, long-wavelength quantum well lasers  

SciTech Connect

A comprehensive study of the effect of compressive strain on the threshold current performance of long-wavelength (1.5 [mu]m) quantum well (QW) lasers is presented. Model predictions of threshold currents in such devices identify QW thickness as a parameter that must be considered in optimizing laser performance when Auger currents are present. A minimum in threshold current density is thus calculated when QW thicknesses are maintained between 70 and 100 [angstrom], presently achieved in strained QW's using InGaAsP, and thereby isolating strain effects from any thickness and energy dependences. Experimental comparisons between strained and unstrained devices thus reveal strain-induced reductions in internal transparency current density per QW from 66 to 40 A/cm[sup 2], an increase in peak differential modal gain from 0.12 to 0.23 cm/A, and evidence for the elimination of intervalence band absorption as compressive strain increases from 0 to 18%. However, most of these improvements arise in the first [approximately]1% of compressive strain. In order to fabricate low-threshold 1.5 [mu]m buried heterostructure BH devices in InP using these trained QW active regions, an optimized design is derived which shows that threshold current is at its lowest when the strip width is approximately 0.6-0.7 [mu]m. Example uncoated BH lasers exhibit room temperature pulsed threshold currents of 5.9 mA in structures without current blocking layers, and 4.1 mA in structures with current blocking layers.

Osinski, J.S.; Grodzinski, P.; Dapkus, D. (Univ. of Southern California, Los Angeles, CA (United States)); Zou, Yao (National Research Council, Ottawa (Canada))

1993-06-01T23:59:59.000Z

72

SHARP THRESHOLDS FOR THE RANDOMCLUSTER AND ISING MODELS  

E-Print Network (OSTI)

SHARP THRESHOLDS FOR THE RANDOM­CLUSTER AND ISING MODELS BENJAMIN GRAHAM AND GEOFFREY GRIMMETT), the Ising model with external field, and the coloured random­cluster model. The principal tech­ nique in statistical physics, namely those of the random­cluster model and the Ising model. In each case, the event

Grimmett, Geoffrey

73

SHARP THRESHOLDS FOR THE RANDOM-CLUSTER AND ISING MODELS  

E-Print Network (OSTI)

SHARP THRESHOLDS FOR THE RANDOM-CLUSTER AND ISING MODELS BENJAMIN GRAHAM AND GEOFFREY GRIMMETT. The models in question are the random-cluster model near the self-dual point psd(q) = q/(1 + q), the Ising in statistical physics, namely those of the random-cluster model and the Ising model. In each case, the event

Grimmett, Geoffrey

74

A Threshold Autoregressive Model for Wholesale Electricity Prices  

E-Print Network (OSTI)

A Threshold Autoregressive Model for Wholesale Electricity Prices B. Ricky Rambharat, Department, 2003 Abstract We introduce a discrete-time model for electricity prices, which accounts for both spikes Introduction The study of electricity price dynamics has attracted significant attention from researchers

75

Polymer Collapse, Protein Folding, and the Percolation Threshold  

E-Print Network (OSTI)

Polymer Collapse, Protein Folding, and the Percolation Threshold HAGAI MEIROVITCH University (Macromolecules 1989, 22, 3986­3997) to study protein folding, where H and P are the hydrophobic and polar amino; computer simulation; collapse transition; protein folding Introduction The behavior of dilute polymer

Meirovitch, Hagai

76

Low dimensional model of heart rhythm dynamics as a tool for diagnosing the anaerobic threshold  

SciTech Connect

We report preliminary results on describing the dependence of the heart rhythm variability on the stress level by using qualitative, low dimensional models. The reconstruction of macroscopic heart models yielding cardio cycles (RR-intervals) duration was based on actual clinical data. Our results show that the coefficients of the low dimensional models are sensitive to metabolic changes. In particular, at the transition between aerobic and aerobic-anaerobic metabolism, there are pronounced extrema in the functional dependence of the coefficients on the stress level. This strong sensitivity can be used to design an easy indirect method for determining the anaerobic threshold. This method could replace costly and invasive traditional methods such as gas analysis and blood tests. {copyright} {ital 1997 American Institute of Physics.}

Anosov, O.L. [Institute of Physiology, Charite Humboldt-University at Berlin, Berlin, D-10117 (Germany)] [Regional. Cardio Center, Vladimir, (Russia); Butkovskii, O.Y. [Vladimir State Technical University, 87, Gorki St., Vladimir, 600026 (Russia); Kadtke, J. [Institute for Pure and Applied Physical Science University of California at San Diego, La Jolla, California 92093-0360 (United States); Kravtsov, Y.A. [Space Research Institute of RAS, 84/32 Profsoyuznaja St., Moscow, 117810 (Russia); Protopopescu, V. [Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6364 (United States)

1997-05-01T23:59:59.000Z

77

Intrashell Electron Interaction Mediated Photoformation of Hollow Atoms near Threshold  

SciTech Connect

Double photoionization (DPI) of an atom by a single photon is a direct consequence of electron-electron interactions within the atom. We have measured the evolution of the K-shell DPI from threshold up in transition metals by high-resolution x-ray emission spectroscopy of the K{sup h}a hypersatellites, photoexcited by monochromatized synchrotron radiation. The measured evolution of the single-to-double photoionization cross-section ratio with excitation energy was found to be universal. Theoretical fits suggest that near threshold DPI is predominantly a semiclassical knockout effect, rather than the purely quantum-mechanical shake-off observed at the infinite photon energy limit.

Houtari, S.; Kao, C.; Hamalainen, K.; Diamant, R.; Sharon, R.; Deutsch, M.

2008-07-25T23:59:59.000Z

78

Predicting threshold and location of laser damage on optical surfaces  

DOE Patents (OSTI)

An apparatus useful in the prediction of the damage threshold of various optical devices, the location of weak spots on such devices and the location, identification, and elimination of optical surface impurities comprising, a focused and pulsed laser, an photo electric detector/imaging means, and a timer. The weak spots emit photoelectrons when subjected to laser intensities that are less than the intensity actually required to produce the damage. The weak spots may be eliminated by sustained exposure to the laser beam.

Siekhaus, Wigbert (Berkeley, CA)

1987-01-01T23:59:59.000Z

79

Threshold Dynamics in Soil Carbon Storage for Bioenergy Crops  

Science Journals Connector (OSTI)

Threshold Dynamics in Soil Carbon Storage for Bioenergy Crops ... Because of increasing demands for bioenergy, a considerable amount of land in the midwestern United States could be devoted to the cultivation of second-generation bioenergy crops, such as switchgrass and miscanthus. ... The foliar carbon/nitrogen ratio (C/N) in these bioenergy crops at harvest is significantly higher than the ratios in replaced crops, such as corn or soybean. ...

Dong K. Woo; Juan C. Quijano; Praveen Kumar; Sayo Chaoka; Carl J. Bernacchi

2014-09-10T23:59:59.000Z

80

? photoproduction from threshold through the S11(1535) resonance  

Science Journals Connector (OSTI)

We study photoproduction of ? mesons off protons in the effective Lagrangian approach. Unlike the ?0 case, ? photoproduction at threshold is strongly dominated by resonance excitation. The quantity (???)1/2A1/2/?T, characteristic of the photoexcitation of the S11(1535) resonance and its decay into the ?-nucleon channel, of interest to hadron models, is determined to be (0.22±0.02)×10-3 MeV-1 from the existing data.

M. Benmerrouche and Nimai C. Mukhopadhyay

1991-08-26T23:59:59.000Z

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81

Economical (k,m)-threshold controlled quantum teleportation  

E-Print Network (OSTI)

We study a (k,m)-threshold controlling scheme for controlled quantum teleportation. A standard polynomial coding over GF(p) with prime p > m-1 needs to distribute a d-dimensional qudit with d >= p to each controller for this purpose. We propose a scheme using m qubits (two-dimensional qudits) for the controllers' portion, following a discussion on the benefit of a quantum control in comparison to a classical control of a quantum teleportation.

Akira SaiToh; Robabeh Rahimi; Mikio Nakahara

2009-01-19T23:59:59.000Z

82

Interference in above-threshold-ionization electron distributions from molecules  

SciTech Connect

We present quantum-mechanical studies on above-threshold ionization of molecular ions in two and three dimensions. The momentum distributions show signatures of interfering emissions from the molecular centers. These structures deviate from a simple double-slit model that ignores the electron-ion interaction, but they are reproduced by an eikonal model. Such distortions of the interference pattern are partly responsible for the absence of clear interference patterns in the angle-integrated electron energy spectra.

Henkel, Jost [Institut fuer Physikalische und Theoretische Chemie, Universitaet Wuerzburg, and Roentgen Research Center for Complex Material Systems, Am Hubland, D-97074 Wuerzburg (Germany); Institut fuer Theoretische Physik and Centre for Quantum Engineering and Space-Time Research (QUEST), Leibniz Universitaet Hannover Appelstrasse 2, D-30167 Hannover (Germany); Lein, Manfred [Institut fuer Theoretische Physik and Centre for Quantum Engineering and Space-Time Research (QUEST), Leibniz Universitaet Hannover Appelstrasse 2, D-30167 Hannover (Germany); Engel, Volker [Institut fuer Physikalische und Theoretische Chemie, Universitaet Wuerzburg, and Roentgen Research Center for Complex Material Systems, Am Hubland, D-97074 Wuerzburg (Germany)

2011-05-15T23:59:59.000Z

83

Sharp thresholds for Hamiltonicity in random intersection graphs  

Science Journals Connector (OSTI)

Random Intersection Graphs, G"n","m","p, is a class of random graphs introduced in Karonski (1999) [7] where each of the n vertices chooses independently a random subset of a universal set of m elements. Each element of the universal sets is chosen independently ... Keywords: Hamilton cycles, Random intersection graph, Sharp threshold, Stochastic order relation between Gn,p and Gn,m,p

Charilaos Efthymiou; Paul G. Spirakis

2010-09-01T23:59:59.000Z

84

Long-Range Validity of Threshold Laws in Inner-Shell Photodetachment  

NLE Websites -- All DOE Office Websites (Extended Search)

Long-Range Validity of Threshold Laws in Inner-Shell Photodetachment Print Long-Range Validity of Threshold Laws in Inner-Shell Photodetachment Print A threshold law describes the dependence of a reaction yield near a reaction threshold. It is also a signature of the physical forces involved in the reaction, so the agreement of an observed threshold behavior with a threshold law or a departure from it can be a sensitive probe into how well the reaction physics is understood. A collaboration from Western Michigan University, the ALS, and Denison University has now shown that the threshold laws for inner-shell photodetachment of negative ions are not only obeyed but can extend over a much wider energy range than theory had predicted. Crossing a Threshold In physics and chemistry, a threshold refers to the minimum energy required for a reaction to just become observable. A threshold law mathematically describes the reaction yield as the energy varies near the threshold. For ionization of an atom, for example, the threshold is the minimum energy needed to eject an electron, and the threshold behavior of the ionization depends only on the Coulomb (electrical) attraction between the positively charged nucleus and negatively charged electron. When absorption of light causes removal (photodetachment) of an electron from a negatively charged ion (atom with one extra electron) the story changes because the negative electron is bound to a neutral atom.

85

Long-Range Validity of Threshold Laws in Inner-Shell Photodetachment  

NLE Websites -- All DOE Office Websites (Extended Search)

Long-Range Validity of Threshold Laws in Inner-Shell Photodetachment Print Long-Range Validity of Threshold Laws in Inner-Shell Photodetachment Print A threshold law describes the dependence of a reaction yield near a reaction threshold. It is also a signature of the physical forces involved in the reaction, so the agreement of an observed threshold behavior with a threshold law or a departure from it can be a sensitive probe into how well the reaction physics is understood. A collaboration from Western Michigan University, the ALS, and Denison University has now shown that the threshold laws for inner-shell photodetachment of negative ions are not only obeyed but can extend over a much wider energy range than theory had predicted. Crossing a Threshold In physics and chemistry, a threshold refers to the minimum energy required for a reaction to just become observable. A threshold law mathematically describes the reaction yield as the energy varies near the threshold. For ionization of an atom, for example, the threshold is the minimum energy needed to eject an electron, and the threshold behavior of the ionization depends only on the Coulomb (electrical) attraction between the positively charged nucleus and negatively charged electron. When absorption of light causes removal (photodetachment) of an electron from a negatively charged ion (atom with one extra electron) the story changes because the negative electron is bound to a neutral atom.

86

Low-threshold analysis of CDMS shallow-site data  

E-Print Network (OSTI)

Data taken during the final shallow-site run of the first tower of the Cryogenic Dark Matter Search (CDMS II) detectors have been reanalyzed with improved sensitivity to small energy depositions. Four ~224 g germanium and two ~105 g silicon detectors were operated at the Stanford Underground Facility (SUF) between December 2001 and June 2002, yielding 118 live days of raw exposure. Three of the germanium and both silicon detectors were analyzed with a new low-threshold technique, making it possible to lower the germanium and silicon analysis thresholds down to the actual trigger thresholds of ~1 keV and ~2 keV, respectively. Limits on the spin-independent cross section for weakly interacting massive particles (WIMPs) to elastically scatter from nuclei based on these data exclude interesting parameter space for WIMPs with masses below 9 GeV/c^2. Under standard halo assumptions, these data partially exclude parameter space favored by interpretations of the DAMA/LIBRA and CoGeNT experiments' data as WIMP signals, and exclude new parameter space for WIMP masses between 3 GeV/c^2 and 4 GeV/c^2.

CDMS Collaboration; D. S. Akerib; M. J. Attisha; L. Baudis; D. A. Bauer; A. I. Bolozdynya; P. L. Brink; R. Bunker; B. Cabrera; D. O. Caldwell; C. L. Chang; R. M. Clarke; J. Cooley; M. B. Crisler; P. Cushman; F. DeJongh; R. Dixon; D. D. Driscoll; J. Filippini; S. Funkhouser; R. J. Gaitskell; S. R. Golwala; D. Holmgren; L. Hsu; M. E. Huber; S. Kamat; R. Mahapatra; V. Mandic; P. Meunier; N. Mirabolfathi; D. Moore; S. W. Nam; H. Nelson; R. W. Ogburn; X. Qiu; W. Rau; A. Reisetter; T. Saab; B. Sadoulet; J. Sander; C. Savage; R. W. Schnee; D. N. Seitz; T. A. Shutt; G. Wang; S. Yellin; J. Yoo; B. A. Young

2010-10-20T23:59:59.000Z

87

Long-Range Validity of Threshold Laws in Inner-Shell Photodetachment  

NLE Websites -- All DOE Office Websites (Extended Search)

Long-Range Validity of Threshold Long-Range Validity of Threshold Laws in Inner-Shell Photodetachment Long-Range Validity of Threshold Laws in Inner-Shell Photodetachment Print Wednesday, 29 March 2006 00:00 A threshold law describes the dependence of a reaction yield near a reaction threshold. It is also a signature of the physical forces involved in the reaction, so the agreement of an observed threshold behavior with a threshold law or a departure from it can be a sensitive probe into how well the reaction physics is understood. A collaboration from Western Michigan University, the ALS, and Denison University has now shown that the threshold laws for inner-shell photodetachment of negative ions are not only obeyed but can extend over a much wider energy range than theory had predicted.

88

Investigation of the Cause of Low Blister Threshold Temperatures in the RERTR-12 and AFIP-4 Experiments  

SciTech Connect

Blister–threshold testing of fuel plates is a standard method through which the safety margin for operation of plate-type in research and test reactors is assessed. The blister-threshold temperature is indicative of the ability of fuel to operate at high temperatures for short periods of time (transient conditions) without failure. This method of testing was applied to the newly developed U-Mo monolithic fuel system. Blister annealing studies on the U-Mo monolithic fuel plates began in 2007, with the Reduced Enrichment for Research and Test Reactors (RERTR)-6 experiment, and they have continued as the U-Mo fuel system has evolved through the research and development process. Blister anneal threshold temperatures from early irradiation experiments (RERTR-6 through RERTR-10) ranged from 400 to 500°C. These temperatures were projected to be acceptable for NRC-licensed research reactors and the high-power Advanced Test Reactor (ATR) and the High Flux Isotope Reactor (HFIR) based on current safety-analysis reports (SARs). Initial blister testing results from the RERTR-12 experiment capsules X1 and X2 showed a decrease in the blister-threshold temperatures. Blister threshold temperatures from this experiment ranged from 300 to 400°C. Selected plates from the AFIP-4 experiment, which was fabricated using a process similar to that used to fabricate the RERTR-12 experiment, also underwent blister testing to determine whether results would be similar. The measured blister-threshold temperatures from the AFIP-4 plates fell within the same blister-threshold temperature range measured in the RERTR-12 plates. Investigation of the cause of this decrease in bister threshold temperature is being conducted under the guidance of Idaho National Laboratory PLN-4155, “Analysis of Low Blister Threshold Temperatures in the RERTR-12 and AFIP-4 Experiments,” and is driven by hypotheses. The main focus of the investigation is in the following areas: 1. Fabrication variables 2. Pre-irradiation characterization 3. Irradiation conditions 4. Post-irradiation examination 5. Additional blister testing 6. Mechanical modeling This report documents the preliminary results of this investigation. Several hypotheses can be dismissed as a result of this investigation. Two primary categories of causes remain. The most prominent theory, supported by the data, is that low blister-threshold temperature is the result of mechanical energy imparted on the samples during the fabrication process (hot and cold rolling) without adequate post processing (annealing). The mechanisms are not clearly understood and require further investigation, but can be divided into two categories: • Residual Stress • Undesirable interaction boundary and/or U-Mo microstructure change A secondary theory that cannot be dismissed with the information that is currently available is that a change in the test conditions has resulted in a statistically significant downward shift of measured blister temperature. This report outlines the results of the forensic investigations conducted to date. The data and conclusions presented in this report are preliminary. Definitive cause and effect relationships will be established by future experimental programs.

Mitchell K Meyer

2012-06-01T23:59:59.000Z

89

Measurement of the generalized form factors near threshold via ?*p ? n?+ at high Q2  

We report the first extraction of the pion-nucleon multipoles near the production threshold for the n?+ channel at relatively high momentum transfer (Q2 up to 4.2 GeV2). The dominance of the s-wave transverse multipole (E0+), expected in this region, allowed us to access the generalized form factor G1 within the light-cone sum rule (LCSR) framework as well as the axial form factor GA. The data analyzed in this work were collected by the nearly 4? CEBAF Large Acceptance Spectrometer (CLAS) using a 5.754-GeV electron beam on a proton target. The differential cross section and the ?-N multipole E0+/GD were measured using two different methods, the LCSR and a direct multipole fit. The results from the two methods are found to be consistent and almost Q2 independent.

Park, K; Adhikari, K P; Adikaram, D; Anghinolfi, M; Baghdasaryan, H; Ball, J; Battaglieri, M; Batourine, V; Bedlinskiy, I; Bennett, R P; Biselli, A S; Bookwalter, C; Boiarinov, S; Branford, D; Briscoe, W J; Brooks, W K; Burkert, V D; Carman, D S; Celentano, A; Chandavar, S; Charles, G; Cole, P L; Contalbrigo, M; Crede, V; D'Angelo, A; Daniel, A; Dashyan, N; De Vita, R; De Sanctis, E; Deur, A; Djalali, C; Doughty, D; Dupre, R; El Alaoui, A; El Fassi, L; Euginio, P; Fedotov, G; Fradi, A; Gabrielyan, M Y; Gevorgyan, N; Gilfoyle, G P; Giovanetti, K L; Girod, F X; Goetz, J T; Gohn, W; Golovatch, E; Graham, L; Griffioen, K A; Guidal, M; Guo, L; Hafidi, K; Hakobyan, H; Hanretty, C; Heddle, D; Hicks, K; Holtrop, M; Ilieva, Y; Ireland, D G; Ishkhanov, B S; Isupov, E L; Jenkins, D; Jo, H S; Joo, K; Khandaker, M; Khertarpal, P; Kim, A; Kim, W; Klein, F J; Kubarovsky, A; Kubarovsky, V; Kuhn, S E; Kuleshov, S V; Kvaltine, N D; Livingston, K; Lu, H Y; MacGregor, J D; Markov, N; Mayer, M; McKinnon, B; Mestayer, M D; Meyer, C A; Mineeva, T; Mirazita, M; Mokeev, V; Moutarde, H; Munevar, E; Nadel-Turonski, P; Nasseripour, R; Niccolai, S; Niculescu, G; Niculescu, I; Osipenko, M; Ostrovidov, A I; Paolone, M; Pappalardo, L; Paremuzyan, R; Park, S; Anefalos Pereira, S; Phelps, E; Pisano, S; Pogorelko, O; Pozdniakov, S; Price, J W; Procureur, S; Prok, Y; Ricco, G; Rimal, D; Ripani, M; Ritchie, B G; Rosner, G; Rossi, P; Sabati ee, F; Saini, M S; Salgado, C; Schott, D; Schumacher, R A; Seraydaryan, H; Sharabian, Y G; Smith, E S; Smith, G D; Sober, D I; Sokhan, D; Stepanyan, S S; Stepanyan, S; Stoler, P; Strakovsky, I I; Strauch, S; Taiuti, M; Tang, W; Taylor, C E; Tian, Y; Tkachenko, S; Trivedi, A; Ungaro, M; Vernarsky, B; Vlassov, A V; Voutier, E; Watts, D P; Weygand, D P; Wood, M H; Zachariou, N; Zhao, B; Zhao, Z W

2012-03-26T23:59:59.000Z

90

Thresher: an improved algorithm for peak height thresholding of microbial community profiles  

Science Journals Connector (OSTI)

......replicates in a pair failing a quantitative test of similarity, either that threshold or...replicates in a pair failing some quantitative test of similarity, either that threshold or...rejected. As we show below, an appropriate test of similarity can be used both to set thresholds......

Verena Starke; Andrew Steele

2014-11-15T23:59:59.000Z

91

Determination of action thresholds for electromagnetic tracking system-guided hypofractionated prostate radiotherapy using volumetric modulated arc therapy  

SciTech Connect

Purpose: Hypofractionated prostate radiotherapy may benefit from both volumetric modulated arc therapy (VMAT) due to shortened treatment time and intrafraction real-time monitoring provided by implanted radiofrequency(RF) transponders. The authors investigate dosimetrically driven action thresholds (whether treatment needs to be interrupted and patient repositioned) in VMAT treatment with electromagnetic (EM) tracking. Methods: VMAT plans for five patients are generated for prescription doses of 32.5 and 42.5 Gy in five fractions. Planning target volume (PTV) encloses the clinical target volume (CTV) with a 3 mm margin at the prostate-rectal interface and 5 mm elsewhere. The VMAT delivery is modeled using 180 equi-spaced static beams. Intrafraction prostate motion is simulated in the plan by displacing the beam isocenter at each beam assuming rigid organ motion according to a previously recorded trajectory of the transponder centroid. The cumulative dose delivered in each fraction is summed over all beams. Two sets of 57 prostate motion trajectories were randomly selected to form a learning and a testing dataset. Dosimetric end points including CTV D95%, rectum wall D1cc, bladder wall D1cc, and urethra Dmax, are analyzed against motion characteristics including the maximum amplitude of the anterior-posterior (AP), superior-inferior (SI), and left-right components. Action thresholds are triggered when intrafraction motion causes any violations of dose constraints to target and organs at risk (OAR), so that treatment is interrupted and patient is repositioned. Results: Intrafraction motion has a little effect on CTV D95%, indicating PTV margins are adequate. Tight posterior and inferior action thresholds around 1 mm need to be set in a patient specific manner to spare organs at risk, especially when the prescription dose is 42.5 Gy. Advantages of setting patient specific action thresholds are to reduce false positive alarms by 25% when prescription dose is low, and increase the sensitivity of detecting dose limits violations by 30% when prescription dose is high, compared to a generic 2 mm action box. The sensitivity and specificity calculated from the testing dataset are consistent to the learning set, which indicates that the patient specific approach is reliable and reproducible within the scope of the prostate database. Conclusions: This work introduces a formalism for ensuring a VMAT delivery meets the most clinically important dose requirements by using patient specific and dosimetric-driven action thresholds to hold the beam and reposition the patient when necessary. Such methods can provide improved sensitivity and specificity compared to conventional methods, which assume directionally symmetric action thresholds.

Zhang, Pengpeng; Mah, Dennis; Happersett, Laura; Cox, Brett; Hunt, Margie; Mageras, Gig [Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York 10021 (United States); Department of Radiation Oncology, Montefiore Medical Center, Bronx, New York 10467 (United States); Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York 10021 (United States); Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center, New York, New York 10021 (United States); Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York 10021 (United States)

2011-07-15T23:59:59.000Z

92

Qualitative and analytical results of the bifurcation thresholds to halo orbits  

E-Print Network (OSTI)

We study the dynamics in the neighborhood of the collinear Lagrangian points in the spatial, circular, restricted three--body problem. We consider the case in which one of the primaries is a radiating body and the other is oblate (although the latter is a minor effect). Beside having an intrinsic mathematical interest, this model is particularly suited for the description of a mission of a spacecraft (e.g., a solar sail) to an asteroid. The aim of our study is to investigate the occurrence of bifurcations to halo orbits, which take place as the energy level is varied. The estimate of the bifurcation thresholds is performed by analytical and numerical methods: we find a remarkable agreement between the two approaches. As a side result, we also evaluate the influence of the different parameters, most notably the solar radiation pressure coefficient, on the dynamical behavior of the model. To perform the analytical and numerical computations, we start by implementing a center manifold reduction. Next, we estimate the bifurcation values using qualitative techniques (e.g. Poincar\\'e surfaces, frequency analysis, FLIs). Concerning the analytical approach, following \\cite{CPS} we implement a resonant normal form, we transform to suitable action-angle variables and we introduce a detuning parameter measuring the displacement from the synchronous resonance. The bifurcation thresholds are then determined as series expansions in the detuning. Three concrete examples are considered and we find in all cases a very good agreement between the analytical and numerical results.

Sara Bucciarelli; Marta Ceccaroni; Alessandra Celletti; Giuseppe Pucacco

2015-02-01T23:59:59.000Z

93

Qualitative and analytical results of the bifurcanion thresholds to halo orbits  

E-Print Network (OSTI)

We study the dynamics in the neighborhood of the collinear Lagrangian points in the spatial, circular, restricted three--body problem. We consider the case in which one of the primaries is a radiating body and the other is oblate (although the latter is a minor effect). Beside having an intrinsic mathematical interest, this model is particularly suited for the description of a mission of a spacecraft (e.g., a solar sail) to an asteroid. The aim of our study is to investigate the occurrence of bifurcations to halo orbits, which take place as the energy level is varied. The estimate of the bifurcation thresholds is performed by analytical and numerical methods: we find a remarkable agreement between the two approaches. As a side result, we also evaluate the influence of the different parameters, most notably the solar radiation pressure coefficient, on the dynamical behavior of the model. To perform the analytical and numerical computations, we start by implementing a center manifold reduction. Next, we estimate the bifurcation values using qualitative techniques (e.g. Poincar\\'e surfaces, frequency analysis, FLIs). Concerning the analytical approach, following \\cite{CPS} we implement a resonant normal form, we transform to suitable action-angle variables and we introduce a detuning parameter measuring the displacement from the synchronous resonance. The bifurcation thresholds are then determined as series expansions in the detuning. Three concrete examples are considered and we find in all cases a very good agreement between the analytical and numerical results.

Sara Bucciarelli; Marta Ceccaroni; Alessandra Celletti; Giuseppe Pucacco

2015-01-23T23:59:59.000Z

94

Effects of Age and Sex on Pure?Tone Thresholds  

Science Journals Connector (OSTI)

Recent developments have emphasized the need for an adequate reference level from which to assess the degree of noise?induced hearing loss. The purpose of the present study was to determine the threshold of hearing for pure tones on a large sample of subjects (N = 500) drawn from a population exposed to minimal levels of industrial noise. Four age groups were studied: 18 to 24 26 to 32 34 to 40 and 43 to 49 years inclusive. Threshold measurements were made from 250 to 8000 cps on a Beltone audiometer provided with PDR?8 earphones calibrated in a National Bureau of Standards Coupler 9?A. The threshold data were analyzed by age groups ear and sex in terms of three types of distributions: (1) original distributions which contained the data for all subjects tested; (2) screened distributions which contained the data only for subjects who passed rigid screening criteria related to otological disorders and extent of noise exposure; and (3) truncated distributions which contained only data ±15 db from the mode of the screen distributions. The results of the study indicate that in general only minor differences (less than 5 db) exist between ears but that women have more sensitive and less variable hearing than men. The sex difference is independent of age and appears to be more marked at the higher frequencies. Although the effects of age are clearly evident for both men and women there is limited agreement between the curves of presbycousis of the present study and those proposed by the American Standards Association. The suggestion is offered that future audiometric standards be specified independently for men and for women according to particular age levels. [This research was supported by the United States Air Force under Contract AF 33(616)?2626 monitored by the Bio?Acoustics Branch Aero?Medical Laboratory Wright Air Development Center Ohio.

John F. Corso

1958-01-01T23:59:59.000Z

95

Threshold Stress Creep Behavior of Alloy 617 at Intermediate Temperatures  

SciTech Connect

Creep of Alloy 617, a solid solution Ni-Cr-Mo alloy, was studied in the temperature range of 1023 K to 1273 K (750 °C to 1000 °C). Typical power-law creep behavior with a stress exponent of approximately 5 is observed at temperatures from 1073 K to 1273 K (800 °C to 1000 °C). Creep at 1023 K (750 °C), however, exhibits threshold stress behavior coinciding with the temperature at which a low volume fraction of ordered coherent y' precipitates forms. The threshold stress is determined experimentally to be around 70 MPa at 1023 K (750 °C) and is verified to be near zero at 1173 K (900 °C)—temperatures directly correlating to the formation and dissolution of y' precipitates, respectively. The y' precipitates provide an obstacle to continued dislocation motion and result in the presence of a threshold stress. TEM analysis of specimens crept at 1023 K (750 °C) to various strains, and modeling of stresses necessary for y' precipitate dislocation bypass, suggests that the climb of dislocations around the y' precipitates is the controlling factor for continued deformation at the end of primary creep and into the tertiary creep regime. As creep deformation proceeds at an applied stress of 121 MPa and the precipitates coarsen, the stress required for Orowan bowing is reached and this mechanism becomes active. At the minimum creep rate at an applied stress of 145 MPa, the finer precipitate size results in higher Orowan bowing stresses and the creep deformation is dominated by the climb of dislocations around the y' precipitates.

J.K. Benz; L.J. Carroll; J.K. Wright; R.N. Wright; T. Lillo

2014-06-01T23:59:59.000Z

96

Threshold for Potential Sputtering of LiF  

Science Journals Connector (OSTI)

We have measured total sputtering yields for impact of slow ( ?100 eV) singly and doubly charged ions on LiF. The minimum potential energy necessary to induce potential sputtering (PS) from LiF was determined to be about 10 eV. This threshold coincides with the energy necessary to produce a cold hole in the valence band of LiF by resonant neutralization. This allows the first unambiguous identification of PS induced by cold holes. Further stepwise increase of the sputtering yield with higher projectile potential energies provides evidence for additional defect-mediated sputtering mechanisms operative in alkali halides.

G. Hayderer; M. Schmid; P. Varga; H P. Winter; F. Aumayr; L. Wirtz; C. Lemell; J. Burgdörfer; L. Hägg; C. O. Reinhold

1999-11-08T23:59:59.000Z

97

Declining Threshold for Hypoxia in the Gulf of Mexico  

Science Journals Connector (OSTI)

Declining Threshold for Hypoxia in the Gulf of Mexico ... The northwestern Gulf of Mexico shelf has been nicknamed “The Dead Zone” due to annual summertime (May?September) bottom-water hypoxia (dissolved oxygen ?2 mg L-1) that can be extensive (>20?000 km2) and last for several months. ... The annual occurrence of summertime (May?September) hypoxia on the northwestern Gulf of Mexico continental shelf has received considerable attention because it can extend over a large area (>20?000 km2) and last for several months (14). ...

Craig A. Stow; Song S. Qian; J. Kevin Craig

2004-12-22T23:59:59.000Z

98

NPR step-scaling across the charm threshold  

E-Print Network (OSTI)

Matching Non-Perturbative Renormalisation on the lattice and perturbative renormalisation would benefit from higher matching scales, which are needed for observables entering their permile era such as BK. In this work we lay down a strategy, within the Rome-Southampton framework, to push this scale higher across the charm threshold, and apply it to an exploration of the BK running from 3 GeV to 9 GeV. This is done on Nf = 2+1+1 ensembles generated by the RBC-UKQCD collaboration, and features a close study of the discretisation effects.

Frison, Julien; Garron, Nicolas

2014-01-01T23:59:59.000Z

99

Lower versus Higher Hemoglobin Threshold for Transfusion in Septic Shock  

Science Journals Connector (OSTI)

...the criteria for septic shock, and had a blood concentration of hemoglobin of 9 g per deciliter or less as measured by means of valid point-of-care testing (see the Supplementary Appendix). The reasons for the exclusion of some patients are shown in Figure 1 and listed in the Supplementary Appendix. Intervention... A large Scandinavian randomized trial showed no important outcome differences between hemoglobin levels of 7 g per deciliter and 9 g per deciliter as transfusion thresholds in patients with septic shock.

Holst L.B.; Haase N.; Wetterslev J.

2014-10-09T23:59:59.000Z

100

Precision determination of the dpi -> NN transition strength at threshold  

E-Print Network (OSTI)

An unusual but effective way to determine at threshold the dpi -> NN transition strength is to exploit the hadronic ground-state broadening in pionic deuterium, accessible by x-ray spectroscopy. The broadening is dominated by the true absorption channel dpi- -> nn, which is related to s-wave pion production pp -> dpi+ by charge symmetry and detailed balance. Using the exotic atom circumvents the problem of Coulomb corrections to the cross section as necessary in the production experiments. Our dedicated measurement finds (1171+23/-49) meV for the broadening yielding (252+5/-11) \\mub.

Th. Strauch; F. D. Amaro; D. F. Anagnostopoulos; P. Bühler; D. S. Covita; H. Gorke; D. Gotta; A. Gruber; A. Hirtl; P. Indelicato; E. -O. LeBigot; M. Nekipelov; J. M. F. dos Santos; S. Schlesser; Ph. Schmid; L. M. Simons; M. Trassinelli; J. F. C. A. Veloso; J. Zmeskal

2010-03-22T23:59:59.000Z

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

?D??0D reaction in the threshold region  

Science Journals Connector (OSTI)

Coherent pion photoproduction on the deuteron is studied in the threshold region spanning photon lab energies from threshold at 139.83 MeV to 160 MeV. Unlike previous similar calculations which used the now obsolete value for the s-wave E0+ multipole, our work relies on the latest information on the elementary amplitudes which are in excellent agreement with recent precise data on the ?p??0p reaction. We compare the exact treatment of pion propagation against various approximations often used in the literature and their impact on the very important pion rescattering contribution. We have investigated the sensitivity of the ?D??0D cross section to various choices of the values of the elementary multipoles and in particular the neutron s-wave amplitude E0+?0n. The Fermi motion, corrections due to the boost from the nucleon to the deuteron frames as well as the deuteron D-state are all taken into account. The predicted total and differential cross sections are compared with the very recent experimental data from the Saskatchewan Accelerator Laboratory.

M. Benmerrouche and E. Tomusiak

1998-09-01T23:59:59.000Z

102

Preliminary ecotoxicity assessment thresholds: Setting screening values for terrestrial systems  

SciTech Connect

How does one address the question of what level of environmental contamination causes adverse effects in plants and wildlife based solely on information from the ecotoxicology literature? One is confronted with a database derived from studies conducted in different laboratories, with different protocols, on different species that address different toxicity endpoints. Rarely will this information be directly applicable to the species of interest. How then are priorities set to sort the literature data in order of relevance to needs? Using decision analysis theory in an analytical hierarchy procedure the authors queried a panel of experts to define which components of a study make it more or less applicable to determining toxicity thresholds for organisms in their natural environment. A questionnaire guided them through a series of pairwise comparisons that enabled them to rank the importance of study duration, endpoint, and other reported variables. Each study from the literature can then be ranked according to the relative weights given to each of the categories and its usefulness determined for setting threshold values for a species of interest.

Fairbrother, A.; Kapustka, L.A.; Anderson, S.A. [Ecological Planning and Toxicology, Inc., Corvallis, OR (United States)

1994-12-31T23:59:59.000Z

103

Threshold hyperon production in proton-proton collisions at COSY-11  

E-Print Network (OSTI)

The Sigma+ hyperon production was measured at the COSY-11 spectrometer via the p p --> n K+ Sigma+ reaction at excess energies of Q = 13 MeV and Q = 60 MeV. These measurements continue systematic hyperon production studies via the p p --> p K+ Lambda/Sigma0 reactions where a strong decrease of the cross section ratio close-to-threshold was observed. In order to verify models developed for the description of the Lambda and Sigma0 production we have performed the measurement on the Sigma+ hyperon and found unexpectedly that the total cross section is by more than one order of magnitude larger than predicted by all anticipated models. After the reconstruction of the kaon and neutron four momenta, the Sigma+ is identified via the missing mass technique. Details of the method and the measurement will be given and discussed in view of theoretical models.

Rozek, T; Budzanowski, A; Czyzykiewicz, R; Grzonka, D; Janusz, M; Jarczyk, L; Kamys, B; Khoukaz, A; Kilian, K; Klaja, P; Kowina, P; Moskal, P; Oelert, W; Piskor-Ignatowicz, C; Przerwa, J; Ritman, J; Sefzick, T; Siemaszko, M; Smyrski, J; Täschner, A; Winter, P; Wolke, M; Wüstner, P; Zhang, Z; Zipper, W

2006-01-01T23:59:59.000Z

104

V-uniform ergodicity of threshold autoregressive nonlinear time series  

E-Print Network (OSTI)

intervals. Each threshold autoregressive model can be embedded in a Markov chain on Rp. For specifics, if we write Xt = (yt,yt-1,...,yt-p+1)prime the TAR(p) model introduced in (1.1) can be expressed as the following: Xt = AiXt-1 +nut, Xt-1 element Ri (1... ... 0 0 0 1 0 ... 0 ... 0 ... 0 0 0 .. ... 1 0 1 CC CC CC CC CC A 3 and nut = xit(1,0,...,0)prime . Since the distribution of Xt given X0,...,Xt-1 depends upon Xt-1 only, Xt is a Markov chain. The transition measure of Xt is singular w.r.t. Lebesgue...

Boucher, Thomas Richard

2004-09-30T23:59:59.000Z

105

Measurements of the Threshold Displacement Energy in Ta and Nb  

Science Journals Connector (OSTI)

Changes in the damage rate (residual electrical resistivity per unit electron fluence) were measured as a function of incident electron energy in the range 1.0-2.2 MeV for 0.002-in.-diam Nb and Ta wires. The threshold energies, estimated by simple extrapolation to zero production rates, were 36 eV for Nb and 32 eV for Ta. The resistivity of a Frenkel pair was determined to be about 5.3 ?? cm/at.% for Nb and 1.9 ?? cm/at.% for Ta. The damage production curves for two other bcc metals, Mo and W, are compared with those for Nb and Ta.

G. Youngblood; S. Myhra; J. W. DeFord

1969-12-15T23:59:59.000Z

106

Threshold estimation from the linear dose-response model: Method and radiation data  

Science Journals Connector (OSTI)

The linear dose-response model is considered a conservative, nonthreshold relationship. This is based on a confusion between the sufficient condition (that is, zero slope at zero dose) and the necessary condit...

David J. Schaeffer; Konanur G. Janardan; Harold W. Kerster

1981-01-01T23:59:59.000Z

107

Low Threshold Parametric Decay Backscattering Instability in Tokamak Electron Cyclotron Resonance Heating Experiments  

Science Journals Connector (OSTI)

The experimental conditions leading to substantial reduction of the backscattering decay instability threshold in electron cyclotron resonance heating experiments in toroidal devices are analyzed. It is shown that a drastic decrease of threshold is provided by the nonmonotonic behavior of plasma density in the vicinity of magnetic island and poloidal magnetic field inhomogeneity making possible localization of ion Bernstein decay waves. The corresponding ion Bernstein wave gain and the parametric decay instability pump power threshold is calculated.

E. Z. Gusakov and A. Yu. Popov

2010-09-09T23:59:59.000Z

108

Low Threshold Parametric Decay Backscattering Instability in Tokamak Electron Cyclotron Resonance Heating Experiments  

SciTech Connect

The experimental conditions leading to substantial reduction of the backscattering decay instability threshold in electron cyclotron resonance heating experiments in toroidal devices are analyzed. It is shown that a drastic decrease of threshold is provided by the nonmonotonic behavior of plasma density in the vicinity of magnetic island and poloidal magnetic field inhomogeneity making possible localization of ion Bernstein decay waves. The corresponding ion Bernstein wave gain and the parametric decay instability pump power threshold is calculated.

Gusakov, E. Z.; Popov, A. Yu. [Ioffe Institute, St.-Petersburg (Russian Federation)

2010-09-10T23:59:59.000Z

109

E-Print Network 3.0 - absolute threshold technique Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

and Computing (1995) 5, 265-273 Application of wavelets to the Summary: theory. In Section 3, we discuss available techniques for thresholding the coefficients of a...

110

E-Print Network 3.0 - above-threshold ionization energy-resolved...  

NLE Websites -- All DOE Office Websites (Extended Search)

Femtoscale Linda Young Summary: is thought to evolve to another breakup mechanism as the excess energy above threshold (203 eV) is increased... describes experiments using...

111

2014 Race to Zero Student Design Competition: Ryerson University Profile (Threshold House)  

Energy.gov (U.S. Department of Energy (DOE))

2014 Race to Zero Student Design Competition: Ryerson University Profile (Threshold House), as posted on the U.S. Department of Energy website.

112

E-Print Network 3.0 - atoms two-photon above-threshold Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

created, which can be considered above threshold ionization ATI . Unlike in the seminal atomic ATI studies... absorption of four laser photons, equivalent to 20 eV excitation...

113

Generalized cell–dual-cell transformation and exact thresholds for percolation  

Science Journals Connector (OSTI)

Suggested by Scullard’s recent star-triangle relation for correlated bond systems, we propose a general “cell–dual-cell” transformation, which allows in principle an infinite variety of lattices with exact percolation thresholds to be generated. We directly verify Scullard’s site percolation thresholds, and derive the bond thresholds for his “martini” lattice (pc=1?2) and the “A” lattice (pc=0.625457…, solution to p5?4p4+3p3+2p2?1=0). We also present a precise Monte Carlo test of the site threshold for the “A” lattice.

Robert M. Ziff

2006-01-27T23:59:59.000Z

114

Observed Minimum Illuminance Threshold for Night Market Vendors in Kenya who use LED Lamps  

SciTech Connect

Creation of light for work, socializing, and general illumination is a fundamental application of technology around the world. For those who lack access to electricity, an emerging and diverse range of LED based lighting products hold promise for replacing and/or augmenting their current fuel-based lighting sources that are costly and dirty. Along with analysis of environmental factors, economic models for total cost-ofownership of LED lighting products are an important tool for studying the impacts of these products as they emerge in markets of developing countries. One important metric in those models is the minimum illuminance demanded by end-users for a given task before recharging the lamp or replacing batteries. It impacts the lighting service cost per unit time if charging is done with purchased electricity, batteries, or charging services. The concept is illustrated in figure 1: LED lighting products are generally brightest immediately after the battery is charged or replaced and the illuminance degrades as the battery is discharged. When a minimum threshold level of illuminance is reached, the operational time for the battery charge cycle is over. The cost to recharge depends on the method utilized; these include charging at a shop at a fixed price per charge, charging on personal grid connections, using solar chargers, and purchasing dry cell batteries. This Research Note reports on the observed"charge-triggering" illuminance level threshold for night market vendors who use LED lighting products to provide general and task oriented illumination. All the study participants charged with AC power, either at a fixed-price charge shop or with electricity at their home.

Johnstone, Peter; Jacobson, Arne; Mills, Evan; Radecsky, Kristen

2009-03-21T23:59:59.000Z

115

Alternatives of non-threshold and threshold concepts of cancerogenic and mutagenic effects of low LET radiation: the analysis of postulates and arguments  

Science Journals Connector (OSTI)

The comparative analysis of radiation-induced stochastic effects in organisms and cells is given under the aspect of the comparison of non-threshold vs. threshold concepts of radiation effect induction including their postulate basis analysis. Most representative data of basic research areas of radiation-induced stochastic effects are considered, including data on radiation epidemiology and experimental and theoretical radiobiology. The main conclusion of the elaborated analysis consists in the principal difference of dose response patterns for radiation-induced, stochastic effects in the low dose range compared with those in the high dose range. The principal inadequacy of extrapolations from high to low dose ranges is noted, as well as the better justification and the corresponding preference attributed to the threshold concept of low LET radiation effects. The new approach principle of the approximate radiation-induced stochastic effect, quasi-threshold evaluation, is presented.

Lev M. Rozhdestvensky

2006-01-01T23:59:59.000Z

116

Phenomenology of the $ppK^+K^-$ system near threshold  

E-Print Network (OSTI)

In this article studies of the near threshold $pp\\to ppK^+K^-$ reaction conducted with the COSY-11 and the ANKE detectors are reviewed. In particular recent investigations on the $K^+K^-$ final state interaction are revisited taking into account updated cross sections of the COSY-11 experiment. These studies resulted in the new value of $K^+K^-$ effective range amounting to: $\\mathrm{Re}(b_{K^{+}K^{-}}) = -0.2^{+0.8_{stat}~+0.4_{sys}}_{-0.6_{stat}~-0.4_{sys}}~\\mathrm{fm}$ and $\\mathrm{Im}(b_{K^{+}K^{-}}) = 1.2^{~+0.5_{stat}~+0.3_{sys}}_{~-0.3_{stat}~-0.3_{sys}}~\\mathrm{fm}$. The determined real and imaginary parts of the $K^+K^-$ scattering length were estimated to be: $\\left|\\mathrm{Re}(a_{K^{+}K^{-}})\\right| = 10^{~+17_{stat}}_{~-10_{stat}}~\\mathrm{fm}$ and $\\mathrm{Im}(a_{K^{+}K^{-}}) = 0^{~+37_{stat}}_{~-10_{stat}}~\\mathrm{fm}$.

M. Silarski

2014-01-18T23:59:59.000Z

117

Relations among Intensity, Time, and Temporary Threshold Shift  

Science Journals Connector (OSTI)

The results of a series of studies using normal ears on the effects of broad?band noise (equal energy in all octave bands from 75 to 10 000 cps) can be summarized by the equation TTS ?=?1.06R(S?85)?( log 10 ?T/1.7)?(1–0.37? log 10 ?t/2) where TTS is the threshold shift at 4000 cps in db t minutes after cessation of a T?minute exposure to the noise;S is the sound?pressure level of the noise and R is the fraction of time that the noise is on. This equation is shown to hold for 05 min t>2 min and all values of R provided that the noise pulses are 1 sec to 1 min long. Thus the relation between intensity and duration for constant TTS is much more complicated than predicted by the equation IT = K of classical psychophysics or the I 2 T = k recently suggested although both are approximately true in particular regions. Furthermore it is evident that a noise on only part of the time is much less dangerous than one on continuously. (This research was supported in part by a grant from the National Institutes of Health.)

W. D. Ward; A. Glorig; D. L. Sklar

1958-01-01T23:59:59.000Z

118

Threshold Concepts and Their Use in Rangeland Management and Restoration: The Good,  

E-Print Network (OSTI)

management via potential-based land classification sys- tems and associated state-and-transition models (STMsThreshold Concepts and Their Use in Rangeland Management and Restoration: The Good, the Bad properties in time or space. In rangeland management, thresholds reflect changes in vegetation and soils

119

Investigating the Effect of Freeway Congestion Thresholds on Decision-making Inputs  

E-Print Network (OSTI)

. The rankings of congestion measures for freeway segments hold steady across the congestion thresholds ranging from 60 mph to 30 mph and across the congestion measures. From an investment point of view, the congestion threshold speed used is not a concern...

Qu, Tongbin

2011-10-21T23:59:59.000Z

120

An extremely sharp phase transition threshold for the slow growing hierarchy  

E-Print Network (OSTI)

threshold point'. An everyday life example of this is the change from one material state to a different oneAn extremely sharp phase transition threshold for the slow growing hierarchy Andreas Weiermann of. This article is part of our general research program on phase transitions in logic

Weiermann, Andreas

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Consumption asymmetry and the stock market: New evidence through a threshold adjustment model  

E-Print Network (OSTI)

Consumption asymmetry and the stock market: New evidence through a threshold adjustment model whether stock market wealth affects real consumption asymmetrically through a threshold adjustment model. The empirical findings for the US show that wealth produces an asymmetric effect on real consumption

Ahmad, Sajjad

122

Catalyst: Triggering Collective Action with Thresholds Justin Cheng, Michael S. Bernstein  

E-Print Network (OSTI)

Catalyst: Triggering Collective Action with Thresholds Justin Cheng, Michael S. Bernstein Stanford The web is a catalyst for drawing people together around shared goals, but many groups never reach other people commit as well. Catalyst is a platform that introduces activation thresholds for on

Pratt, Vaughan

123

4th BIENNIAL THRESHOLD CONCEPTS CONFERENCE and 6th NAIRTL ANNUAL CONFERENCE  

E-Print Network (OSTI)

4th BIENNIAL THRESHOLD CONCEPTS CONFERENCE and 6th NAIRTL ANNUAL CONFERENCE Register at www.nairtl.ie/conference12 before May 31st Registration fee is 200 SUB-THEMES The conference programme will include oral development, and new developments in threshold concepts. PRE-CONFERENCE WORKSHOPS A pre-conference "Student

O'Mahony, Donal E.

124

Profit Sharing with Thresholds and Non-monotone Player Utilities Elliot Anshelevich  

E-Print Network (OSTI)

Profit Sharing with Thresholds and Non-monotone Player Utilities Elliot Anshelevich John Postl July that the player utility is monotone in the number of participants working on their project, we consider non-monotone player utilities. Such utilities could result, for example, from "threshold" or "phase transition

Anshelevich, Elliot

125

Two-photon above-threshold ionization of magnesium F. Martin,2  

E-Print Network (OSTI)

Two-photon above-threshold ionization of magnesium A. Reber,1 F. Marti´n,2 H. Bachau,3 and R. S to understanding the photoionization properties of magnesium 1­8 , the problem of above- threshold ionization ATI

Berry, R. Stephen

126

Characterization of the Threshold Response of Initiation of Blood Clotting to Stimulus Patch Size  

E-Print Network (OSTI)

Characterization of the Threshold Response of Initiation of Blood Clotting to Stimulus Patch Size demonstrates that the threshold response of initiation of blood clotting to the size of a patch of stimulus on the Damko¨hler number. Human blood and plasma were exposed to surfaces patterned with patches presenting

Ismagilov, Rustem F.

127

Design and implementation of a sub-threshold wireless BFSK transmitter  

E-Print Network (OSTI)

the BFSK transmitter using a standard cell methodology on the same die operating at super-threshold voltages on a different voltage domain. Experiments using the fabricated die show that the sub-threshold circuit consumes 19.4x lower power than...

Paul, Suganth

2009-05-15T23:59:59.000Z

128

Design and implementation of a sub-threshold wireless BFSK transmitter  

E-Print Network (OSTI)

the BFSK transmitter using a standard cell methodology on the same die operating at super-threshold voltages on a different voltage domain. Experiments using the fabricated die show that the sub-threshold circuit consumes 19.4x lower power than...

Paul, Suganth

2008-10-10T23:59:59.000Z

129

The H-mode power threshold in hydrogen plasmas in DIII-D  

SciTech Connect

In DIII-D, experiments have been performed in hydrogen plasmas to determine the requirement for hydrogen operation in ITER. The H-mode threshold power has been determined to increase with input torque for both hydrogen and deuterium plasmas with the H-mode power threshold for hydrogen plasmas being greater by approximately a factor of 2 at zero torque than in comparable deuterium plasmas. The threshold power for hydrogen discharges with full counter-current beam injection is roughly the same as the threshold power for deuterium discharges with co-current beam injection. The plasma geometry also influences the power threshold through the vertical distance between the X-point and the divertor surface.

Gohil, P. [General Atomics; Jernigan, T. C. [Oak Ridge National Laboratory (ORNL); Scoville, J. T. [General Atomics, San Diego; Strait, E. J. [General Atomics

2009-01-01T23:59:59.000Z

130

Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory  

E-Print Network (OSTI)

Results are reported from a joint analysis of Phase I and Phase II data from the Sudbury Neutrino Observatory. The effective electron kinetic energy threshold used is Teff=3.5 MeV, the lowest analysis threshold yet achieved ...

Monroe, Jocelyn

131

Associated production of Higgs boson with vector boson at threshold N$^3$LO in QCD  

E-Print Network (OSTI)

We present the results for the associated production of Higgs boson with vector boson computed at threshold N$^3$LO in QCD. We use the recently available result on the threshold contributions to the inclusive Drell-Yan production cross-section at third order in strong coupling constant. We have implemented it in the publicly available computer package vh@nnlo, thereby obtaining the numerical impact of threshold N$^3$LO contributions for the first time. We find that the inclusion of such corrections do reduce theoretical uncertainties resulting from the renormalization scale.

Kumar, M C; Ravindran, V

2014-01-01T23:59:59.000Z

132

Higgs boson gluon-fusion production beyond threshold in N3LO QCD  

E-Print Network (OSTI)

In this article, we compute the gluon fusion Higgs boson cross-section at N3LO through the second term in the threshold expansion. This calculation constitutes a major milestone towards the full N3LO cross section. Our result has the best formal accuracy in the threshold expansion currently available, and includes contributions from collinear regions besides subleading corrections from soft and hard regions, as well as certain logarithmically enhanced contributions for general kinematics. We use our results to perform a critical appraisal of the validity of the threshold approximation at N3LO in perturbative QCD.

Anastasiou, Charalampos; Dulat, Falko; Furlan, Elisabetta; Gehrmann, Thomas; Herzog, Franz; Mistlberger, Bernhard

2014-01-01T23:59:59.000Z

133

Threshold displacement energies and defect formation energies in Y2Ti2O7  

SciTech Connect

Ab initio molecular dynamics simulations have been carried out to determine both the threshold displacement energies Ed and corresponding defect configurations, and ab initio methods have been used to accurately determine the formation energies in Y2Ti2O7. The minimum Ed is found to be 27 eV for a Y recoil along the <100> direction, 31.5 eV for Ti atoms along the <100> direction, 14.5 eV for O48f atoms along the <110> direction and 13 eV for O8b atoms along the <111> direction. The average Ed value along three directions determined is 35.1, 35.4, 17.0 and 16.2 eV for yttrium, titanium, O48f and O8b atoms, respectively. Cation interstitials at vacant 8a sites, which are generally occupied by oxygen anions, and at the bridge sites between two neighboring cations along the <010> direction are observed after low energy recoil events. A systematic study of the defect formation energies suggests that cation interstitials, which are located at 8a sites and bridge sites along the <010> direction, and in split configurations along the <010>, <110> or <111> direction, are all stable in these configurations. It is suggested that the relative stability of cation interstitials may provide a pathway of driving ion-irradiation induced amorphization in Y2Ti2O7.

Xiao, Haiyan Y.; Gao, Fei; Weber, William J.

2010-10-20T23:59:59.000Z

134

PT-symmetric sinusoidal optical lattices at the symmetry-breaking threshold  

SciTech Connect

The PT-symmetric potential V{sub 0}[cos(2{pi}x/a)+i{lambda}sin(2{pi}x/a)] has a completely real spectrum for {lambda}{<=}1 and begins to develop complex eigenvalues for {lambda}>1. At the symmetry-breaking threshold {lambda}=1 some of the eigenvectors become degenerate, giving rise to a Jordan-block structure for each degenerate eigenvector. In general this is expected to result in a secular growth in the amplitude of the wave. However, it has been shown in a recent paper by Longhi, by numerical simulation and by the use of perturbation theory, that for a broad initial wave packet this growth is suppressed, and instead a saturation leading to a constant maximum amplitude is observed. We revisit this problem by explicitly constructing the Bloch wave functions and the associated Jordan functions and using the method of stationary states to find the dependence on the longitudinal distance z for a variety of different initial wave packets. This allows us to show in detail how the saturation of the linear growth arises from the close connection between the contributions of the Jordan functions and those of the neighboring Bloch waves.

Graefe, Eva-Maria [Mathematics Department, Imperial College, London SW7 2BZ (United Kingdom); Jones, H. F. [Physics Department, Imperial College, London SW7 2BZ (United Kingdom)

2011-07-15T23:59:59.000Z

135

Electrochemical and Electro-Discharge Machining with a Threshold Current  

Science Journals Connector (OSTI)

......machining and electro-discharge machining of a metal...problems in which the electric potential satisfies...ECM), electro-discharge machining (EDM...method of electrochemical arc machining (ECAM...depending upon the local electric current density. In......

A. A. LACEY; M. SHILLOR

1987-01-01T23:59:59.000Z

136

Electrical power distribution control methods, electrical energy demand monitoring methods, and power management devices  

DOE Patents (OSTI)

Electrical power distribution control methods, electrical energy demand monitoring methods, and power management devices are described. In one aspect, an electrical power distribution control method includes providing electrical energy from an electrical power distribution system, applying the electrical energy to a load, providing a plurality of different values for a threshold at a plurality of moments in time and corresponding to an electrical characteristic of the electrical energy, and adjusting an amount of the electrical energy applied to the load responsive to an electrical characteristic of the electrical energy triggering one of the values of the threshold at the respective moment in time.

Chassin, David P. (Pasco, WA); Donnelly, Matthew K. (Kennewick, WA); Dagle, Jeffery E. (Richland, WA)

2006-12-12T23:59:59.000Z

137

Evidence of a Threshold Wind Speed in Tower-mounted Scatterometer Data David W. Draper and David G. Long  

E-Print Network (OSTI)

Evidence of a Threshold Wind Speed in Tower-mounted Scatterometer Data David W. Draper and David G ) in scatterom- eter measurements over water is theorized to go to zero below a threshold wind speed due. Evidence of the threshold wind speed and a hysteresis effect have been observed in airship and wave tank

Long, David G.

138

Error Threshold for Color Codes and Random Three-Body Ising Models  

E-Print Network (OSTI)

We study the error threshold of color codes, a class of topological quantum codes that allow a direct implementation of quantum Clifford gates suitable for entanglement distillation, teleportation, and fault-tolerant quantum ...

Bombin, Hector

139

Effect of ambient light on electronically displayed medical images as measured by luminance-discrimination thresholds  

Science Journals Connector (OSTI)

The effect of ambient light on linearization of gray scales was studied in two experiments by measuring brightness-discrimination thresholds for stimuli as a function of ambient-light...

Rogers, Diane C; Pizer, Stephen M; Johnston, R Eugene

1987-01-01T23:59:59.000Z

140

DOE Hydrogen and Fuel Cells Program Record 11007: Hydrogen Threshold Cost Calculation  

Energy.gov (U.S. Department of Energy (DOE))

Record 11007 from the U.S. Department of Energy Hydrogen and Fuel Cells Program documents the methodology and assumptions used to calculate the hydrogen threshold cost of $2.00 to $4.00 per gasoline gallon equivalent.

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Conventional wisdom and challenges to the threshold behavior of two-electron escape  

Science Journals Connector (OSTI)

The threshold behavior of two-electron escape and the complementary characterization of doubly-excited resonances have been the subject of investigation for forty years. The conventional view of the physics of...

M. S. Lubell

1994-01-01T23:59:59.000Z

142

Direct measurement of onset and offset phonation threshold pressure in normal subjects  

Science Journals Connector (OSTI)

Phonation threshold pressures were directly measured in five normal subjects in a variety of voicing conditions. The effects of fundamental frequency intensity closure speed of the vocal folds and laryngeal airway resistance on phonation threshold pressures were determined. Subglottic air pressures were measured using percutaneous puncture of the cricothyroid membrane. Both onset and offset of phonation were studied to see if a hysteresis effect produced lower offset pressures than onset pressures. Univariate analysis showed that phonation threshold pressure was influenced most strongly by fundamental frequency and intensity. Multiple linear regression showed that these two variables as well as laryngeal airway resistance most strongly predicted phonation threshold pressure. Two of the five subjects demonstrated a significant hysteresis effect but one subject actually had higher offset pressures than onset pressures.

Randall L. Plant; Gary L. Freed; Richard E. Plant

2004-01-01T23:59:59.000Z

143

No-threshold dose-response curves for nongenotoxic chemicals: Findings and applications for risk assessment  

SciTech Connect

We tested the hypothesis that no threshold exists when estradiol acts through the same mechanism as an active endogenous estrogen. A Michaelis-Menten (MM) equation accounting for response saturation, background effects, and endogenous estrogen level fit a turtle sex-reversal data set with no threshold and estimated the endogenous dose. Additionally, 31 diverse literature dose-response data sets were analyzed by adding a term for nonhormonal background; good fits were obtained but endogenous dose estimations were not significant due to low resolving power. No thresholds were observed. Data sets were plotted using a normalized MM equation; all 178 data points were accommodated on a single graph. Response rates from {approx}1% to >95% were well fit. The findings contradict the threshold assumption and low-dose safety. Calculating risk and assuming additivity of effects from multiple chemicals acting through the same mechanism rather than assuming a safe dose for nonthresholded curves is appropriate.

Sheehan, Daniel M. [Daniel M. Sheehan and Associates, 1422 Scott St., Little Rock, AR 72202 (United States)]. E-mail: dansheeh@swbell.net

2006-01-15T23:59:59.000Z

144

Analysis of an esoteric interpretation of a threshold in beta decay  

Science Journals Connector (OSTI)

A threshold associated with a small mixing of a heavy neutrino in beta decay cannot be interpreted as due to the production of a fictitious neutral scalar in conjunction with a light neutrino.

G. Karl; V. Novikov; J. J. Simpson

1992-11-01T23:59:59.000Z

145

Tuning the threshold voltage in electrolyte-gated organic field-effect transistors  

Science Journals Connector (OSTI)

...variation of the electric potential (constant electric field) across the...respectively. q is the elementary charge, Qis is the...attributed to contact resistance. The threshold...Chemicals | Algorithms Electric Conductivity Electrolytes...

Loïg Kergoat; Lars Herlogsson; Benoit Piro; Minh Chau Pham; Gilles Horowitz; Xavier Crispin; Magnus Berggren

2012-01-01T23:59:59.000Z

146

Identification of threshold levels for Warner-Bratzler shear force of beef value cuts  

E-Print Network (OSTI)

IDENTIFICATION OF THRESHOLD LEVELS FOR WARNER-BRATZLER SHEAR FORCE OF BEEF VALUE CUTS A Thesis by LEEANN SITKA Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE August 2007 Major Subject: Animal Science IDENTIFICATION OF THRESHOLD LEVELS FOR WARNER-BRATZLER SHEAR FORCE OF BEEF VALUE CUTS A Thesis by LEEANN SITKA Submitted to the Office...

Sitka, LeeAnn

2009-06-02T23:59:59.000Z

147

Effect of taurine on chemoshock seizure thresholds in lead-exposed animals  

SciTech Connect

The high levels of taurine found in developing brain have led to postulates that taurine is involved in brain maturation. The authors have examined the effect of taurine on the chemoshock threshold of rats reared in the presence of the environmental toxin, lead. Within 24 h of giving birth, dams were placed on one of four regimens: Group P received 0.4% lead acetate in the drinking water; Group T received 3% taurine in drinking water; Group PT received both taurine and lead acetate; and Group C received distilled water. The pups were weaned at 21 days, but maintained on the same treatments. Pentylene tetrazole seizure thresholds were determined at 42 days. Thresholds in Group P were significantly depressed relative to Group C (56.0 mg/kg v 79.9 mg/kg). Taurine supplementation had no effect on threshold (T = 72.7 mg/kg). However, thresholds in Group PT were significantly higher than those of Group P (PT = 85.2 mg/kg). These data show that whereas taurine was without effect on the threshold of animals not stressed by exposure to lead, it had a protective effect on exposed animals. As human neonates are unable to synthesize taurine, the findings reinforce the concept of taurine being a conditionally essential nutrient in developing humans.

Huxtable, R.J.; Shindo, S.; Nakagawa, K.

1986-03-01T23:59:59.000Z

148

Optical breakdown threshold investigation of 1064 nm laser induced air plasmas  

SciTech Connect

We present the theoretical and experimental measurements and analysis of the optical breakdown threshold for dry air by 1064 nm infrared laser radiation and the significance of the multiphoton and collisional cascade ionization process on the breakdown threshold measurements over pressures range from 10 to 2000 Torr. Theoretical estimates of the breakdown threshold laser intensities and electric fields are obtained using two distinct theories namely multiphoton and collisional cascade ionization theories. The theoretical estimates are validated by experimental measurements and analysis of laser induced breakdown processes in dry air at a wavelength of 1064 nm by focusing 450 mJ max, 6 ns, 75 MW max high-power 1064 nm IR laser radiation onto a 20 {mu}m radius spot size that produces laser intensities up to 3 - 6 TW/cm{sup 2}, sufficient for air ionization over the pressures of interest ranging from 10 to 2000 Torr. Analysis of the measured breakdown threshold laser intensities and electric fields are carried out in relation with classical and quantum theoretical ionization processes, operating pressures. Comparative analysis of the laser air breakdown results at 1064 nm with corresponding results of a shorter laser wavelength (193 nm) [M. Thiyagarajan and J. E. Scharer, IEEE Trans. Plasma Sci. 36, 2512 (2008)] and a longer microwave wavelength (10{sup 8} nm) [A. D. MacDonald, Microwave Breakdown in Gases (Wiley, New York, 1966)]. A universal scaling analysis of the breakdown threshold measurements provided a direct comparison of breakdown threshold values over a wide range of frequencies ranging from microwave to ultraviolet frequencies. Comparison of 1064 nm laser induced effective field intensities for air breakdown measurements with data calculated based on the collisional cascade and multiphoton breakdown theories is used successfully to determine the scaled collisional microwave portion. The measured breakdown threshold of 1064 nm laser intensities are then scaled to classical microwave breakdown theory after correcting for the multiphoton ionization process for different pressures and good agreement, regarding both pressure dependence and breakdown threshold electric fields, is obtained. The effect of the presence of submicron particles on the 1064 nm breakdown threshold was also investigated. The measurements show that higher breakdown field is required, especially at lower pressures, and in close agreement with classical microwave breakdown theory and measurements in air.

Thiyagarajan, Magesh; Thompson, Shane [Plasma Engineering Research Lab (PERL), College of Science and Engineering, Texas A and M University-Corpus Christi, Texas 78412 (United States)

2012-04-01T23:59:59.000Z

149

The FY 2007 Budget Request - On the Threshold of Incredible Advances  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

7 Budget Request 7 Budget Request On the Threshold of Incredible Advances Douglas L. Faulkner Acting Assistant Secretary Office of Energy Efficiency and Renewable Energy February 2006 2 President's State of the Union Address Keeping America competitive requires affordable energy. And here we have a serious problem: America is addicted to oil, which is often imported from unstable parts of the world. The best way to break this addiction is through technology.... and we are on the threshold of incredible advances... So tonight I announce...push for breakthroughs in two vital areas...change how we power our homes and offices,...change how we power our automobiles. On the Threshold of Incredible Advances 3 Change How We Power Our Automobiles * President's Biofuels Initiative * President's Hydrogen Fuel Initiative

150

Question: What is the cost threshold for providing cost detail for subrecipient  

NLE Websites -- All DOE Office Websites (Extended Search)

Question: What is the cost threshold for providing cost detail for subrecipients or consultant Question: What is the cost threshold for providing cost detail for subrecipients or consultant information? Is there a cost threshold set for third parties? Answer: Each subawardee/subrecipient/subcontractor whose work is expected to exceed $650,000 or 50% of the total work effort (whichever is less) should complete a Budget Justification package to include the SF 424A budget form, Budget Justification Guideline Excel document, and a narrative supporting the Budget Justification Guidelines. This information may be saved as a separate file or included with the Prime Applicant's Budget.pdf file. Summary level information for subawardees is not sufficient. Detailed explanations and supporting

151

A Hierarchy of Linear Threshold Models for the Spread of Political Revolutions on Social Networks  

E-Print Network (OSTI)

We study a linear threshold agent-based model (ABM) for the spread of political revolutions on social networks using empirical network data. We propose new techniques for building a hierarchy of simplified ordinary differential equation (ODE) based models that aim to capture essential features of the ABM, including effects of the actual networks, and give insight in the parameter regime transitions of the ABM. We relate the ABM and the hierarchy of models to a population-level compartmental ODE model that we proposed previously for the spread of political revolutions [1], which is shown to be mathematically consistent with the proposed ABM and provides a way to analyze the global behaviour of the ABM. This consistency with the linear threshold ABM also provides further justification a posteriori for the compartmental model of [1]. Extending concepts from epidemiological modelling, we define a basic reproduction number $R_0$ for the linear threshold ABM and apply it to predict ABM behaviour on empirical networ...

Lang, John C

2015-01-01T23:59:59.000Z

152

Probing nuclear symmetry energy with the sub-threshold pion production  

E-Print Network (OSTI)

Within the framework of semiclassical Boltzmann-Uehling-Uhlenbeck (BUU) transport model, we investigated the effects of symmetry energy on the sub-threshold pion using the isospin MDI interaction with the stiff and soft symmetry energies in the central collision of $^{48}$Ca + $^{48}$Ca at the incident beam energies of 100, 150, 200, 250 and 300 MeV/nucleon, respectively. We find that the ratio of $\\pi^{-}/\\pi^{+}$ of sub-threshold charged pion production is greatly sensitive to the symmetry energy, particularly around 100 MeV/nucleon energies. Large sensitivity of sub-threshold charged pion production to nuclear symmetry energy may reduce uncertainties of probing nuclear symmetry energy via heavy-ion collision.

Fang Zhang; Yang Liu; Gao-Chan Yong; Wei Zuo

2012-04-05T23:59:59.000Z

153

Improving noise threshold for optical quantum computing with the EPR photon source  

SciTech Connect

We show that the noise threshold for optical quantum computing obtained by Varnava et al. [Phys. Rev. Lett. 100, 060502 (2008)] can be significantly improved by replacing the single-photon source with the Einstein-Podolsky-Rosen (EPR) type of photon source. In this implementation, for an EPR source that emits either nothing (a vacuum state) or a perfect EPR state with probability {eta}{sub s}, the detector efficiency {eta}{sub d} is required to be larger than 50% and the source efficiency {eta}{sub s} can be an arbitrarily small positive number. We also present the error threshold for a more general noise model including additional photon absorption and show that the threshold still compares favorably with the previous results. We discuss several physical setups for realization of the required EPR photon source, including a photon emitter in a single-atom cavity.

Wei, Z.-H. [Centre for Quantum Technologies, National University of Singapore, Singapore 117542 (Singapore); Department of Physics and MCTP, University of Michigan, Ann Arbor, Michigan 48109 (United States); Han, Y.-J.; Duan, L.-M. [Department of Physics and MCTP, University of Michigan, Ann Arbor, Michigan 48109 (United States); Oh, C. H. [Centre for Quantum Technologies, National University of Singapore, Singapore 117542 (Singapore)

2010-06-15T23:59:59.000Z

154

High Energy Thresholds in SUSY GUTs - A refined analysis  

E-Print Network (OSTI)

In a previous paper we have developed a novel method in order to parametrize the effect of the large number of HETs into as fewer parameters as possible. Apart from its obvious advantages this parametrization serves as a vehicle for the examination of the validity of a minimal SO(10) model concerning a series of constraints. Among them is demand for unification of the gauge couplings, the experimental values of the strong coupling constant and lower experimental bound of the proton lifetime. All of these claims lead to preferred regions both in the soft the superheavy parameter space. In this paper we give the necessary updates of our results which stem mainly from the recent experimental measurements. We also include some additions in our analysis involving the universal trilinear coupling A_0 and the rate x, which is related to superheavy vevs. Finally we cross-check the preferred regions of the parameter space and narrow the even more by applying new constraints based on the results of the LHC experiment f...

Katsikatsou, A

2014-01-01T23:59:59.000Z

155

Bounds on the map threshold of iterative decoding systems with erasure noise  

E-Print Network (OSTI)

BOUNDS ON THE MAP THRESHOLD OF ITERATIVE DECODING SYSTEMS WITH ERASURE NOISE A Thesis by CHIA-WEN WANG Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment of the requirements for the degree of MASTER OF SCIENCE... August 2008 Major Subject: Electrical Engineering BOUNDS ON THE MAP THRESHOLD OF ITERATIVE DECODING SYSTEMS WITH ERASURE NOISE A Thesis by CHIA-WEN WANG Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment...

Wang, Chia-Wen

2008-10-10T23:59:59.000Z

156

Higgs boson gluon–fusion production at threshold in N3LO QCD  

Science Journals Connector (OSTI)

Abstract We present the cross-section for the threshold production of the Higgs boson at hadron-colliders at next-to-next-to-next-to-leading order (N3LO) in perturbative QCD. We present an analytic expression for the partonic cross-section at threshold and the impact of these corrections on the numerical estimates for the hadronic cross-section at the LHC. With this result we achieve a major milestone towards a complete evaluation of the cross-section at N3LO which will reduce the theoretical uncertainty in the determination of the strengths of the Higgs boson interactions.

Charalampos Anastasiou; Claude Duhr; Falko Dulat; Elisabetta Furlan; Thomas Gehrmann; Franz Herzog; Bernhard Mistlberger

2014-01-01T23:59:59.000Z

157

Analysis and estimation of the threshold for a microwave "pellicle mirror" parametric oscillator, via energy conservation  

E-Print Network (OSTI)

An experiment is proposed to observe the dynamical Casimir effect by means of two tandem, high Q, superconducting microwave cavities, which are separated from each other by only a very thin wall consisting of a flexible superconducting membrane that can be driven into motion by means of resonant "pump" microwaves injected into the left cavity. Degenerate "signal" and "idler" microwave signals can then be generated by the exponential amplification of vacuum fluctuations in the initially empty right cavity, above a certain threshold. The purpose of this paper is calculate the threshold for this novel kind of opto-mechanical parametric oscillation, using energy considerations.

Chiao, Raymond Y

2012-01-01T23:59:59.000Z

158

Very Stable Electron Field Emission From Strontium Titanate Coated Carbon Nanotube Matrices With Low Emission Thresholds  

SciTech Connect

PMMA-STO-CNT matrices were created by opened-tip vertically-aligned multiwalled carbon nanotubes (VA-MWCNTs) with conformal coating of strontium titanate and Poly(methyl methacrylate). Emission threshold of 0.8 V/?m was demonstrated, about five-fold lower than that of the as-grown VAMWCNTs. Theoretical simulation and modeling suggest that PMMA-STO-CNT matrices have suppressed screening effects and Coulombs’ repulsion forces between electrons in adjacent CNTs, leading to low emission threshold, high emission density, and prolong emission stability. These findings are important for practical application of VA-MWCNTs in field emission devices.

Pandey, Archana; Prasad, Abhishek; Moscatello, Jason; Engelhard, Mark H.; Wang, Chong M.; Yap, Yoke K.

2013-01-22T23:59:59.000Z

159

Alternative rebate rules in the provision of a threshold public good: An experimental investigation  

Science Journals Connector (OSTI)

This study reports the effects of rebate rules on voluntary contributions to a threshold public good. Rebate rules specify how excess contributions, over the threshold amount are distributed. We examine three rebate rules experimentally: a no rebate policy where excess contributions are discarded, a proportional rebate policy where excess contributions are rebated proportionally to an individual's contribution, and a utilization rebate policy where excess contributions provide some continuous public good. Significantly more Nash equilibrium outcomes are observed under the no rebate treatment than under either of the other two. Interestingly, the variance of contributions differs significantly between rebate treatments.

Melanie Marks; Rachel Croson

1998-01-01T23:59:59.000Z

160

Improving noise threshold for optical quantum computing with the EPR photon source  

E-Print Network (OSTI)

We show that the noise threshold for optical quantum computing can be significantly improved by using the EPR-type of photon source. In this implementation, the detector efficiency $\\eta_{d}$ is required to be larger than 50%, and the source efficiency $\\eta_{s}$ can be an arbitrarily small positive number. This threshold compares favorably with the implementation using the single-photon source, where one requires the combined efficiency $\\eta_{d}\\eta_{s}>2/3$. We discuss several physical setups for realization of the required EPR photon source, including the photon emitter from a single-atom cavity.

Z. -H. Wei; Y. -J. Han; C. H. OH; L. -M. Duan

2009-12-08T23:59:59.000Z

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to obtain the most current and comprehensive results.


161

arXiv:hepex/9905010 Towards Low-Threshold, Real-Time Solar Neutrino  

E-Print Network (OSTI)

of qualitatively new experimental tools. According to the SSM the solar neutrino ux is dominated by the low energy energy resolution. The main obstacle in achieving these goals comes from the formidable backgrounds fromarXiv:hep­ex/9905010 v1 6 May 1999 Towards Low-Threshold, Real-Time Solar Neutrino Detectors G

Gratta, Giorgio

162

Non-parametric Multiple-Antenna Blind Spectrum Sensing by Predicted Eigenvalue Threshold  

E-Print Network (OSTI)

in poor spectrum utilization. The dramatic increase in the demand for radio spectrum and the actual low (secondary user) must be aware of its radio environment and capable of detecting the licensed users, alsoNon-parametric Multiple-Antenna Blind Spectrum Sensing by Predicted Eigenvalue Threshold K. Hassan

Paris-Sud XI, Université de

163

A simple Markov model of sodium channels with a dynamic threshold  

Science Journals Connector (OSTI)

Characteristics of action potential generation are important to understanding brain functioning and, thus, must be understood and modeled. It is still an open question what model can describe concurrently the phenomena of sharp spike shape, the spike ... Keywords: Conductance-based neurons, Divisive effect, Dynamic patch-clamp, Sodium channels, Spike shape, Spike threshold

A. V. Chizhov; E. Yu. Smirnova; K. Kh. Kim; A. V. Zaitsev

2014-08-01T23:59:59.000Z

164

Effects of creatine loading on electromyographic fatigue threshold during cycle ergometry in college-aged women  

E-Print Network (OSTI)

The purpose of this study was to examine the effects of 5 days of Creatine (Cr) loading on the electromyographic fatigue threshold (EMGFT) in college-aged women. Fifteen healthy college-aged women (mean ± SD = 22.3 ± 1.7 ...

Smith, Abbie E.; Walter, Ashley A.; Herda, Trent J.; Ryan, Eric D.; Moon, Jordan R.; Cramer, Joel T.; Stout, Jeffrey R.

2007-01-01T23:59:59.000Z

165

A threshold area ratio of organic to conventional agriculture causes recurrent pathogen outbreaks in organic agriculture  

E-Print Network (OSTI)

A threshold area ratio of organic to conventional agriculture causes recurrent pathogen outbreaks in organic agriculture S. Adl a, , D. Iron b , T. Kolokolnikov b a Department of Biology, Dalhousie Fungal spores Organic agriculture Pathogen dispersal Conventional agriculture uses herbicides, pesticides

Kolokolnikov, Theodore

166

THE LOW-TEMPERATURE THRESHOLD FOR PINK SALMON EGGS IN RELATION TO A PROPOSED HYDROELECTRIC INSTALLATION  

E-Print Network (OSTI)

THE LOW-TEMPERATURE THRESHOLD FOR PINK SALMON EGGS IN RELATION TO A PROPOSED HYDROELECTRIC INSTALLATION JACK E. BAILEY' AND DALE R. EVANS' ABSTRACT A proposed hydroelectric installation in southeastern hydroelectric installation could result in temperatures as low as 4.5 0 C during spawning and initial incubation

167

Temporal Integration of Sound Pressure Determines Thresholds of Auditory-Nerve Fibers  

E-Print Network (OSTI)

and at variance with one another. They include sound pressure, sound power, or intensity, which are proportional to the square of pressure, and energy, i.e., the integral of sound power over time. Here we showTemporal Integration of Sound Pressure Determines Thresholds of Auditory-Nerve Fibers Peter Heil

Allen, Jont

168

Asymptotic behavior of the minimum mean squared error threshold for noisy  

E-Print Network (OSTI)

Ã?cients of piecewise smooth signals Maarten Jansen Adhemar Bultheel Report TW 294, October 1999 n Katholieke smooth signals Maarten Jansen Adhemar Bultheel Report TW 294, October 1999 Department of Computer Science Jansen, Adhemar Bultheel October 4, 1999 Abstract This paper investigates the minimum risk threshold

Jansen, Maarten

169

Integrating Preemption Threshold Scheduling and Dynamic Voltage Scaling for Energy Efficient Real-Time  

E-Print Network (OSTI)

scheduling (PTS) enables designing scalable real-time systems. PTS not only decreases the run-time overhead by the Earliest Dead- line First (EDF) policy. We present an algorithm to compute threshold preemption levels- tion is an important aspect of embedded systems design. Generally speaking, the pro- cessor consumes

Gupta, Rajesh

170

Three-photon above-threshold ionization of magnesium F. Martin,2  

E-Print Network (OSTI)

Three-photon above-threshold ionization of magnesium A. Reber,1 F. Marti´n,2 H. Bachau,3 and R. S of magnesium as an electron source 1 have motivated our theoretical study in three-photon above

Berry, R. Stephen

171

Above-threshold ionization near the 3p4d 1 autoionizing state in magnesium  

E-Print Network (OSTI)

Above-threshold ionization near the 3p4d 1 Fo autoionizing state in magnesium A. Reber,1 T. Baynard ionization of magnesium from the 3 1 P state in the region of the 3p4d 1 Fo autoionizing resonance, in which of magnesium atoms just inside the focus of a magnetic bottle spectrometer MBS 13 . One laser is tuned

Berry, R. Stephen

172

Pseudo-random-number generators and the square site percolation threshold  

Science Journals Connector (OSTI)

Selected pseudo-random-number generators are applied to a Monte Carlo study of the two-dimensional square-lattice site percolation model. A generator suitable for high precision calculations is identified from an application specific test of randomness. After extended computation and analysis, an ostensibly reliable value of pc=0.59274598(4) is obtained for the percolation threshold.

Michael J. Lee

2008-09-25T23:59:59.000Z

173

Electron-Nuclear Energy Sharing in Above-Threshold Multiphoton Dissociative Ionization of H2  

E-Print Network (OSTI)

Electron-Nuclear Energy Sharing in Above-Threshold Multiphoton Dissociative Ionization of H2 J. Wu­4], where the photon energy is shared by the freed electrons and the nuclear fragments. For the molecular ionization [10­15], and the imaging of inter- nuclear distance using nuclear kinetic energy release spec- tra

Thumm, Uwe

174

Monotone cooperative games and their threshold versions Haris Aziz Felix Brandt Paul Harrenstein  

E-Print Network (OSTI)

Monotone cooperative games and their threshold versions Haris Aziz Felix Brandt Paul Harrenstein,brandtf,harrenst}@tcs.ifi.lmu.de ABSTRACT Cooperative games provide an appropriate framework for fair and stable resource allocation in multiagent systems. This paper focusses on monotone cooperative games, a class which comprises a variety

Cengarle, María Victoria

175

THRESHOLDING-BASED SEGMENTATION AND APPLE GRADING BY MACHINE Devrim Unay, and Bernard Gosselin  

E-Print Network (OSTI)

THRESHOLDING-BASED SEGMENTATION AND APPLE GRADING BY MACHINE VISION Devrim Unay, and Bernard.tcts.fpms.ac.be ABSTRACT In this paper, a computer vision based system is introduced to automatically grade apple fruits outperformed others with 89 % recognition. 1. INTRODUCTION Computer vision based quality sorting of apple

Dupont, Stéphane

176

Determination of energy thresholds on an artificial retina using a multiple-pulsed laser  

E-Print Network (OSTI)

This study is focused on determining single and multiple pulse ED?? for laser pulses of 200 ns duration. Energy thresholds in this experiment were determined on an artificial retina, for a variety of pulse widths and spot sizes. Due to numerous...

Stephenson, Albert David

2012-06-07T23:59:59.000Z

177

Fatigue threshold R-curves for predicting reliability of ceramics under cyclic loading  

E-Print Network (OSTI)

these materials are typically susceptible to prema- ture failure by subcritical crack propagation owing growth resistance [11] for cracks shorter than the steady-state bridging-zone lengths. Such crack, grain-bridging ceramics, the crack-size dependence of the fatigue threshold during bridging zone

Ritchie, Robert

178

Tau threshold experiments: status and expectations A.G. Shamov for KEDR Collaboration a  

E-Print Network (OSTI)

1 Tau threshold experiments: status and expectations #3; A.G. Shamov for KEDR Collaboration. The most precise measurement of this kind was performed by the BES collaboration in 1991. We critically is completely dominated by the result of the BES collaboration [3] based on 65 #28; + #28; events. Since

179

Collision-induced desorption of ammonia chemisorbed on Pt^111: From direct measurement of the threshold energy to determination  

E-Print Network (OSTI)

metal surface by a beam of neutral, energetic Ar atoms. From direct measurement of the threshold energy for NH3 desorption at one-quarter of a monolayer coverage were measured for Ar beam energies up to 3 e surface well depth from a collision-induced desorption experiment is measurement of the threshold energy

Levis, Robert J.

180

Fatigue Threshold R-Curve Behavior of Grain Bridging Ceramics: Role of Grain Size and Grain-Boundary Adhesion  

E-Print Network (OSTI)

unless they experience environmentally assisted subcritical growth during cyclic loading.7 Fatigue-crack (moist air and dry N2). The fine-grained micro- structure showed higher fatigue thresholds at short crack sizes, while the coarse-grained microstructure demonstrated higher fatigue thresholds at long crack

Kruzic, Jamie

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
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181

ARM - VAP Process - visst  

NLE Websites -- All DOE Office Websites (Extended Search)

Productsvisst Productsvisst Documentation & Plots visst : XDC documentation Data Management Facility Plots (Quick Looks) ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send VAP : Minnis Cloud Products Using Visst Algorithm (VISST) Instrument Categories Cloud Properties, Satellite Observations General Overview Satellite based retrievals of cloud and radiation properties are available in this value-added product provided by Pat Minnis' group at NASA/Langley using the VISST (Visible Infrared Solar-Infrared Split Window Technique) algorithm. These datastreams are both pixel-level (4-km) retrievals and averages on a 0.3 or 0.5 degree latitude-longitude grid and replace earlier satellite-based retrievals on the Layered Bispectral Threshold Method

182

Cloud Microphysical and Radiative Properties Derived from MODIS, VIRS, AVHRR, and GMS Data Over the Tropical Western Pacific  

NLE Websites -- All DOE Office Websites (Extended Search)

Microphysical and Radiative Properties Derived Microphysical and Radiative Properties Derived from MODIS, VIRS, AVHRR, and GMS Data Over the Tropical Western Pacific G. D. Nowicki, M. L. Nordeen, P. W. Heck, D. R. Doelling, and M. M. Khaiyer Analytical Services and Materials, Inc. Hampton, Virginia P. Minnis National Aeronautics and Space Administration Atmospheric Sciences Division Langley Research Center Hampton, Virginia S. Sun-Mack Science Applications International Corporation Hampton, Virginia Introduction Utilization of the geostationary meteorological satellite (GMS) imagery has allowed for the derivation of cloud and radiative properties over the Tropical Western Pacific (TWP) on relatively high spatial and temporal scales. The layered bispectral threshold method (LBTM) has been applied to GMS data

183

Nonsequential double ionization below laser-intensity threshold: Anticorrelation of electrons without excitation of parent ion  

SciTech Connect

Two-electron correlated spectra of nonsequential double ionization below laser-intensity threshold are known to exhibit back-to-back scattering of the electrons, i.e., the anticorrelation of the electrons. Currently, the widely accepted interpretation of the anticorrelation is recollision-induced excitation of the ion plus subsequent field ionization of the second electron. We argue that another mechanism, namely, simultaneous electron emission, when the time of return of the rescattered electron is equal to the time of liberation of the bounded electron (i.e., the ion has no time for excitation), can also explain the anticorrelation of the electrons in the deep, below laser-intensity threshold regime. Our conclusion is based on the results of the numerical solution of the time-dependent Schroedinger equation for a model system of two one-dimensional electrons, as well as on an adiabatic analytic model that allows for a closed-form solution.

Bondar, D. I. [University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada); National Research Council of Canada, Ottawa, Ontario K1A 0R6 (Canada); Yudin, G. L. [National Research Council of Canada, Ottawa, Ontario K1A 0R6 (Canada); Universite de Sherbrooke, Sherbrooke, Quebec J1K 2R1 (Canada); Liu, W.-K. [University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada); Ivanov, M. Yu. [Imperial College, London SW7 2BW (United Kingdom); Bandrauk, A. D. [Universite de Sherbrooke, Sherbrooke, Quebec J1K 2R1 (Canada)

2011-01-15T23:59:59.000Z

184

Vibrational Feshbach resonances in near threshold HOCO{sup -} photodetachment: a theoretical study  

SciTech Connect

The results of a theoretical study of HOCO{sup ?} photodetachment are presented, with a view toward understanding the origin of two peaks observed by Lu and Continetti (Phys. Rev. Lett. 99, 113005 (2007)) in the photoelectron kinetic energy spectrum very close to threshold. It is shown that the peaks can be attributed to vibrational Feshbach resonances of dipole-bound trans-HOCO{sup ?}, and not s- and p-wave shape resonances as previously assumed. Fixed-nuclei variational electron-HOCO scattering calculations are used to compute photodetachment cross sections and laboratory-frame photoelectron angular distributions. The calculations show a broad A??(#25;{pi}*)-shape resonance several eV above threshold.

Miyabe, Shungo; Haxton, Dan; Lawler, Keith; Orel, Ann; McCurdy, Bill; Rescigno, Tom

2011-03-02T23:59:59.000Z

185

Longitudinal Single-Bunch Instability in the ILC Damping Rings: Estimate of Current Threshold  

SciTech Connect

Characterization of single-bunch instabilities in the International Linear Collider (ILC) damping rings (DRs) has been indicated as a high-priority activity toward completion of an engineering design. In this paper we report on a first estimate ofthe current thresholds for the instability using numerical and analytical models of the wake potentials associated with the various machine components. The numerical models were derived (upon appropriate scaling) from designs of the correspondingcomponents installed in existing machines. The current thresholds for instabilities were determined by numerical solution of the Vlasov equation for the longitudinal dynamics. For the DR baseline lattice as of Feb. 2007 we find the critical current forinstability to be safely above the design specifications leaving room for further optimization of the choice of the momentum compaction.

Venturini, Marco; Venturini, Marco

2008-06-25T23:59:59.000Z

186

Evidence for threshold effects in positron diffraction from NaF and LiF  

Science Journals Connector (OSTI)

We have measured the energy dependence of the intensity of a positron beam specularly reflected from the (100) surfaces of NaF and LiF. A 1-eV-wide peak located at an energy that decreases with increasing angle of incidence ? is qualitatively identified as a beam threshold effect. Given the known small positron affinity for the solids, the narrowness of the peak is consistent with its being due to a true surface resonance. However, the dispersion appears to depart from the expected energy versus ? trajectory parallel to the kinematic threshold. Additionally, a search in 50-meV steps did not reveal any fine structure in the peaks, possibly due to our 0.3-eV effective instrumental resolution. Further experiments to map the dispersion with greater precision, to measure the binding energies of the resonances, and to search for possible fine structure are proposed.

T. N. Horsky; G. R. Brandes; K. F. Canter; P. H. Lippel; A. P. Mills; Jr.

1989-10-15T23:59:59.000Z

187

Charge-distribution effect of imaging molecular structure by high-order above-threshold ionization  

SciTech Connect

Using a triatomic molecular model, we show that the interference pattern in the high-order above-threshold ionization (HATI) spectrum depends dramatically on the charge distribution of the molecular ion. Therefore the charge distribution can be considered a crucial factor for imaging a molecular geometric structure. Based on this study, a general destructive interference formula for each above-threshold ionization channel is obtained for a polyatomic molecule concerning the positions and charge values of each nuclei. Comparisons are made for the HATI spectra of CO{sub 2}, O{sub 2}, NO{sub 2}, and N{sub 2}. These results may shed light on imaging complex molecular structure by the HATI spectrum.

Wang Bingbing; Fu Panming [Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080 (China); Guo Yingchun [Department of Physics, State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062 (China); Zhang Bin; Zhao Zengxiu [Department of Physics, National University of Defense Technology, Changsha 410073 (China); Yan Zongchao [Department of Physics, University of New Brunswick, Fredericton, New Brunswick E3B 5A3 (Canada)

2010-10-15T23:59:59.000Z

188

Site-Percolation Threshold of Carbon Nanotube Fibers: Fast Inspection of Percolation with Markov Stochastic Theory  

E-Print Network (OSTI)

We present a site-percolation model based on a modified FCC lattice, as well as an efficient algorithm of inspecting percolation which takes advantage of the Markov stochastic theory, in order to study the percolation threshold of carbon nanotube (CNT) fibers. Our Markov-chain based algorithm carries out the inspection of percolation by performing repeated sparse matrix-vector multiplications, which allows parallelized computation to accelerate the inspection for a given configuration. With this approach, we determine that the site-percolation transition of CNT fibers occurs at p_c =0.1533+-0.0013, and analyze the dependence of the effective percolation threshold (corresponding to 0.5 percolation probability) on the length and the aspect ratio of a CNT fiber on a finite-size-scaling basis. We also discuss the aspect ratio dependence of percolation probability with various values of p (not restricted to p_c).

Xu, Fangbo; Yakobson, Boris I

2014-01-01T23:59:59.000Z

189

Development of high damage threshold optics for petawatt-class short-pulse lasers  

SciTech Connect

The authors report laser-induced damage threshold measurements on pure and multilayer dielectrics and gold-coated optics at 1053 and 526 nm for pulse durations, {tau}, ranging from 140 fs to 1 ns. Damage thresholds of gold coatings are limited to 500 mJ/cm{sup 2} in the subpicosecond range for 1053-nm pulses. In dielectrics, qualitative differences in the morphology of damage and a departure from the diffusion-dominated {tau}1/2 scaling indicate that damage results from plasma formation and ablation for {tau}{le}10 ps and from conventional melting and boiling for {tau}>50 ps. A theoretical model based on electron production via multiphoton ionization, Joule heating, and collisional (avalanche) ionization is in quantitative agreement with both the pulsewidth and wavelength scaling of experimental results.

Stuart, B.C.; Perry, M.D.; Boyd, R.D. [and others

1995-02-22T23:59:59.000Z

190

Single-shot and single-spot measurement of laser ablation threshold for carbon nanotubes  

E-Print Network (OSTI)

A simple and convenient procedure for single-shot, single-spot ablation threshold measurement has been developed. It is based on the employment of cylindrical lens to obtain elliptical Gaussian laser spot. The ablated spot chords which are parallel to the minor axis were measured across the spot major axis which is proportional to the fluence cross-section thus providing wide range dependence of damaged spot size versus fluence in one spot measurement. For both conventional and new-developed procedures the ablation threshold for typical Nd:YAG laser parameters (1064 nm, 10 ns) has been measured as 50 mJ/cm2 which is one order of magnitude lower than that for a bulk graphite.

Lednev, Vasily N; Obraztsova, Elena D; Kudryashov, Sergey I; Bunkin, Alexey F

2013-01-01T23:59:59.000Z

191

Spin-tagged electron-hydrogen scattering: Ionization in the near-threshold region  

SciTech Connect

We use beams of polarized electrons and polarized hydrogen atoms to measure the ionization-rate asymmetry, {Delta}{sub {ital I}}=({ital R}({up arrow}{down arrow}){minus}{ital R}({up arrow}{up arrow}))/({ital R}({up arrow}{down arrow})+{ital R}({up arrow}{up arrow})), in the near-threshold region, where {ital R}({up arrow}{down arrow}) and {ital R}({up arrow}{up arrow}) are the ionization rates when the electron spin is antiparallel and parallel, respectively, to the atomic spins. Within 1.7 eV above threshold, our results reveal the presence of structure, which heretofore has not been predicted by any conventional theoretical calculation.

Guo, X.Q.; Crowe, D.M.; Lubell, M.S.; Tang, F.C.; Vasilakis, A.; Slevin, J.; Eminyan, M. (Department of Physics, City College of the City University of New York, New York, NY (USA) Department of Experimental Physics, St. Patrick's College, Maynooth, Maynooth, County Kildare (United Kingdom) Laboratoire de Physique Atomique, Tour 24, Universite Paris VII, F-75251 Paris (France))

1990-10-08T23:59:59.000Z

192

Near-threshold quantization for potentials with inverse-cube tails  

Science Journals Connector (OSTI)

For potential wells with long-range attractive tails proportional to -1/r3, as occur in the resonant dipole-dipole interaction in homonuclear alkali-metal dimers, we present a highly accurate analytical expression for the tail contribution to the quantization function F(E). This quantization function determines the near-threshold bound-state energies via the quantization rule nth-n=F(En). The performance of the quantization function derived in this paper is demonstrated by applying it to a model Lennard-Jones potential and to vibrational bound-state spectra of sodium dimers (Na2). These results are compared with those obtained via the semiclassical LeRoy-Bernstein formula which neglects quantum effects that are important in the near-threshold regime.

Tim-Oliver Müller and Harald Friedrich

2011-02-02T23:59:59.000Z

193

Revisiting Bloodstein's Anticipatory Struggle Hypothesis from a psycholinguistic perspective: A Variable Release Threshold hypothesis of stuttering  

Science Journals Connector (OSTI)

Abstract This paper reviews Bloodstein's (1975) Anticipatory Struggle Hypothesis of stuttering, identifies its weaknesses, and proposes modifications to bring it into line with recent advances in psycholinguistic theory. The review concludes that the Anticipatory Struggle Hypothesis provides a plausible explanation for the variation in the severity of stuttered disfluencies across speaking situations and conversation partners. However, it fails to explain the forms that stuttered disfluencies characteristically take or the subjective experience of loss of control that accompanies them. The paper then describes how the forms and subjective experiences of persistent stuttering can be accounted for by a threshold-based regulatory mechanism of the kind described in Howell's (2003) revision of the EXPLAN hypothesis. It then proposes that shortcomings of both the Anticipatory Struggle and EXPLAN hypotheses can be addressed by combining them together to create a ‘Variable Release Threshold’ hypothesis whereby the anticipation of upcoming difficulty leads to the setting of an excessively high threshold for the release of speech plans for motor execution. The paper also reconsiders the possibility that two stuttering subtypes exist: one related to formulation difficulty and other to difficulty initiating motor execution. It concludes that research findings that relate to the one may not necessarily apply to the other. Learning outcomes: After reading this article, the reader will be able to: (1) summarize the key strengths and weaknesses of Bloodstein's Anticipatory Struggle Hypothesis; (2) describe two hypothesized mechanisms behind the production of stuttered disfluencies (tension and fragmentation & release threshold mechanisms); and (3) discuss why the notion of anticipation is relevant to current hypotheses of stuttering.

Paul H. Brocklehurst; Robin J. Lickley; Martin Corley

2013-01-01T23:59:59.000Z

194

Search for Sub-threshold Photoproduction of J/Psi Mesons  

SciTech Connect

A search was made for sub-threshold $J/\\psi$ production from a carbon target using a mixed real and quasi-real Bremsstrahlung photon beam with an endpoint energy of 5.76 GeV. No events were observed, which is consistent with predictions assuming quasi-free production. The results place limits on exotic mechanisms that strongly enhance quasi-free production.

Bosted, Peter; Dunne, James; Lee, C.A.; Junnarkar, Parikshit; Arrington, John; Asaturyan, Razmik; Benmokhtar, Fatiha; Christy, Michael; Chudakov, Eugene; Clasie, Benjamin; Connell, Simon; Dalton, Mark; Daniel, AJI; Day, Donal; Dutta, Dipangkar; Ent, Rolf; Fomin, Nadia; Gaskell, David; Horn, Tanja; Kalantarians, Narbe; Keppel, Cynthia; Meekins, David; Mkrtchyan, Hamlet; Navasardyan, Tigran; Roche, Julie; Rodriguez, Victor; Rohe, Daniela; Seely, Charles; Slifer, Karl; Strikman, Mark; Tajima, Shigeyuki; Testa, Giuseppe; Trojer, Roman; Wesselmann, Frank; Wood, Stephen; Zheng, Xiaochao

2009-01-01T23:59:59.000Z

195

Threshold-Based Insulin-Pump Interruption for Reduction of Hypoglycemia  

Science Journals Connector (OSTI)

...changes in glycated hemoglobin levels. We conducted a randomized, controlled, multicenter, open-label trial — ASPIRE (Automation to Simulate Pancreatic Insulin Response) In-Home study — to evaluate the effects of the threshold-suspend feature with sensor-augmented insulin-pump therapy, as compared... In this study involving patients with type 1 diabetes, sensor-augmented insulin-pump therapy plus automated insulin suspension when glucose dropped below 70 mg per deciliter reduced nocturnal hypoglycemia, without affecting glycated hemoglobin values.

Bergenstal R.M.; Klonoff D.C.; Garg S.K.

2013-07-18T23:59:59.000Z

196

Reexamination of tests of the Wannier threshold law for two-electron escape  

SciTech Connect

Recent experimental studies of the spin dependence in electron-impact ionization of atomic hydrogen revealed the presence of deviations from the predictions of the conventional Wannier threshold theory of two-electron escape. We provide some insight into the possible origin of these deviations and reexamine the results of previous work that had claimed consistency with the Wannier theory but, with added statistical analysis, also seem to show deviations.

Friedman, J.R.; Guo, X.Q.; Lubell, M.S. (Department of Physics, City College of the City University of New York, New York, New York 10031 (United States)); Frankel, M.R. (Department of Statistics, Baruch College of the City University of New York, New York, New York 10010 (United States))

1992-07-01T23:59:59.000Z

197

Search for Sub-threshold Photoproduction of J/Psi Mesons  

E-Print Network (OSTI)

A search was made for sub-threshold $J/\\psi$ production from a carbon target using a mixed real and quasi-real Bremsstrahlung photon beam with an endpoint energy of 5.76 GeV. No events were observed, which is consistent with predictions assuming quasi-free production. The results place limits on exotic mechanisms that strongly enhance quasi-free production.

P. Bosted; J. Dunne; C. A. Lee; P. Junnarkar; J. Arrington; R. Asaturyan; F. Benmokhtar; M. E. Christy; E. Chudakov; B. Clasie; S. H. Connell; M. M. Dalton; A. Daniel; D. Day; D. Dutta; R. Ent; N. Fomin; D. Gaskell; T. Horn; N. Kalantarians; C. E. Keppel; D. G. Meekins; H. Mkrtchyan; T. Navasardyan; J. Roche; V. M. Rodriguez; D. Kiselev; J. Seely; K. Slifer; M. Strikman; S. Tajima; G. Testa; Roman Trojer; F. R. Wesselmann; S. A. Wood; X. C. Zheng

2008-11-14T23:59:59.000Z

198

Limiting absorption principle for some long range perturbations of Dirac systems at threshold energies  

E-Print Network (OSTI)

We establish a limiting absorption principle for some long range perturbations of the Dirac systems at threshold energies. We cover multi-center interactions with small coupling constants. The analysis is reduced to study a family of non-self-adjoint operators. The technique is based on a positive commutator theory for non self-adjoint operators, which we develop in appendix. We also discuss some applications to the dispersive Helmholzt model in the quantum regime.

Nabile Boussaid; Sylvain Golénia

2009-06-08T23:59:59.000Z

199

M1 Giant Resonance in Pb208 From Threshold Photoneutron Measurements  

Science Journals Connector (OSTI)

From threshold photoneutron cross-section and angular-distribution measurements on Pb208, seven 1+ states have been detected, which have a total M1 strength of 51 eV. This M1 strength, centered at an excitation energy of 7.9 MeV and spread over a range of 700 keV, constitutes at least half and perhaps all of the total M1 strength obtained from shell-model calculations.

C. D. Bowman, R. J. Baglan, B. L. Berman, and T. W. Phillips

1970-11-02T23:59:59.000Z

200

The low threshold parametric decay instabilities leading to anomalous phenomena at ECRH in toroidal devices  

SciTech Connect

A possibility of 3D electron Bernstein wave trapping in intensive magnetic field aligned density fluctuation or blob in toroidal plasma is demonstrated. Semi-analytic approach for description of associated plasma cavity is developed. A mechanism of low-threshold parametric decay instability driven by 2{sup nd} harmonic extraordinary pump microwave and leading to excitation of localized electron Bernstein wave and low frequency heavily damped oscillations is proposed and analyzed.

Gusakov, E.; Popov, A.; Saveliev, A. [Ioffe Physical Technical Institute of RAS, St. Petersburg (Russian Federation)

2014-02-12T23:59:59.000Z

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201

Damage and ablation thresholds of fused-silica in femtosecond regime  

SciTech Connect

We present an experimental and numerical study of the damage and ablation thresholds at the surface of a dielectric material, e.g., fused silica, using short pulses ranging from 7 to 300 fs. The relevant numerical criteria of damage and ablation thresholds are proposed consistently with experimental observations of the laser irradiated zone. These criteria are based on lattice thermal melting and electronic cohesion temperature, respectively. The importance of the three major absorption channels (multi-photon absorption, tunnel effect, and impact ionization) is investigated as a function of pulse duration (7-300 fs). Although the relative importance of the impact ionization process increases with the pulse duration, our results show that it plays a role even at short pulse duration (<50 fs). For few optical cycle pulses (7 fs), it is also shown that both damage and ablation fluence thresholds tend to coincide due to the sharp increase of the free electron density. This electron-driven ablation regime is of primary interest for thermal-free laser-matter interaction and therefore for the development of high quality micromachining processes.

Chimier, B.; Uteza, O.; Sanner, N.; Sentis, M. [Laboratoire LP3, UMR 6182 CNRS - Universite de la Mediterranee, C. 917, 163, Av. de Luminy, 13288 Marseille cedex 9 (France); Itina, T. [Laboratoire Hubert Curien - LaHC, UMR 5516 CNRS - Universite Jean Monnet, Bat. F, 18, rue Professeur B. Lauras, 42000 Saint-Etienne (France); Lassonde, P.; Legare, F.; Vidal, F.; Kieffer, J. C. [INRS, Energie, Materiaux et Telecommunications, 1650 bld Lionel Boulet, Varennes (Quebec), J3X 1S2 (Canada)

2011-09-01T23:59:59.000Z

202

High-Power Electrostatic Discharges in PETN: Threshold and Scaling Experiments  

SciTech Connect

There is a considerable set of data establishing the safety of PETN-based detonators that are insulted by electrostatic discharge (ESD) from a human body. However, the subject of ESD safety has garnered renewed interest because of the sparse data on high-power, low-impedance discharges that result when the source is a metallic object such as a tool. Experiments on as-built components, using pin-to-cap fault circuits through PETN-based detonators, showed significant evidence of a power dependence but with a very broad energy threshold and some uncertainty in the breakdown path. We have performed a series of experiments using a well-defined arc discharge path and a well-characterized source that is capable of independent variation of energy and power. Studies include threshold variation with power, arc length, powder surface area, and surface vs. bulk discharge paths. We find that an energy threshold variation with power does not appear to exist in the tested range of fractions to tens of MW, and that there are many subtleties to proper energy and power bookkeeping. We also present some test results for PBX 9407.

Liou, W; McCarrick, J F; Hodgin, R L; Phillips, D F

2010-03-05T23:59:59.000Z

203

Optical damage threshold of Au nanowires in strong femtosecond laser fields  

E-Print Network (OSTI)

Ultrashort, intense light pulses permit the study of nanomaterials in the optical non-linear regime, potentially leading to optoelectronics that operate in the petahertz domain. These non-linear regimes are often present just below the damage threshold thus requiring the careful tuning of laser parameters to avoid the melting and disintegration of the materials. Detailed studies of the damage threshold of nanoscale materials are therefore needed. We present results on the damage threshold of Au nanowires when illuminated by intense femtosecond pulses. These nanowires were synthesized with the directed electrochemical nanowire assembly (DENA) process in two configurations: (1) free-standing Au nanowires on W electrodes and (2) Au nanowires attached to fused silica slides. In both cases the wires have a single-crystalline structure. For laser pulses with durations of 108 fs and 32 fs at 790 nm at a repetition rate of 2 kHz, we find that the free-standing nanowires melt at intensities close to 3 TW/cm$^2$ and 7....

Summers, A M; Paneru, Govind; Kling, M F; Flanders, B N; Trallero-Herrero, C A

2013-01-01T23:59:59.000Z

204

High-efficiency, dielectric multilayer gratings optimized for manufacturability and laser damage threshold  

SciTech Connect

Ultrashort pulse, high-intensity lasers offer new opportunities for the study of light-matter interaction and for inertial confinement fusion. A 100 Terawatt laser operating 400 fs and 1.053 {mu}m is operational at LLNL, and a 1000 Terawatt (Petawatt) laser will come online in early 1996. These lasers use large-aperture (40 cm and 94 cm diameter, respectively) diffraction gratings to compress the amplified laser pulse. At present, hologrphically produced, gold overcoated photoresist gratings are used: these gratings represent the fuse in the laser chain. Higher laser damage thresholds and higher diffraction efficiencies are theoretically possible with multilayer dielectric gratings (MDG`s). A number of design parameters regarding both the multilayer stack and the etched grating structure can be optimized to maximize the laser damage threshold and also improve the processing latitude for the interference lithography and reactive ion etching steps used during manufacture of these gratings. This paper presents model predictions for the behavior of hafnia/silica MDG`s both during processing and in operation, and presents experimental data on the diffraction efficiency and short- pulse laser damage threshold for optimized witness gratings.

Britten, J.A.; Perry, M.D.; Shore, B.W.; Boyd, R.D.; Loomis, G.E.; Chow, R.

1995-11-29T23:59:59.000Z

205

Dynamic theory of cascades on finite clustered random networks with a threshold rule  

Science Journals Connector (OSTI)

Cascade dynamics on networks are usually analyzed statically to determine existence criteria for cascades. Here, the Watts model of threshold dynamics on random Erd?s-Rényi networks is analyzed to determine the dynamic time evolution of cascades. The network is assumed to have a specific finite number of nodes n and is not assumed to be treelike. All combinations of threshold ?, network average nodal degree z, and seed sizes |S| from a single node up are included. The analysis permits study of network size effects and increased clustering coefficient. Several size effects not found by infinite network theory are predicted by the analysis and confirmed by simulations. In the region of ? and z where a single node can start a cascade, cascades are expanding, in the sense that each step flips a larger group than the previous step did. We show that this region extends to larger values of z than predicted by infinite network analyses. In the region where larger seeds are needed (size proportional to n), cascades begin by contracting: at the outset, each step flips fewer nodes than the previous step, but eventually the process reverses and becomes expanding. A critical mass that grows during the cascade beyond an easily-calculated threshold is identified as the cause of this reversal.

Daniel E. Whitney

2010-12-08T23:59:59.000Z

206

Multiphoton detachment of H-. II. Intensity-dependent photodetachment rates and threshold behavior—complex-scaling generalized pseudospectral method  

E-Print Network (OSTI)

intensity considered ranges from 1 to 40 GW/cm2 and the laser frequency covers 0.20–0.42 eV (in the c.m. frame). Finally we perform a simulation of intensity-averaged multiphoton detachment rates by considering the experimental conditions of the laser and H...

Chu, Shih-I; Wang, Jingyan; Laughlin, Cecil

1994-10-01T23:59:59.000Z

207

Optimal threshold-based network-level transportation infrastructure life-cycle management with heterogeneous maintenance actions  

Science Journals Connector (OSTI)

Transportation infrastructure life-cycle management deals with maintenance decision making of transportation facilities such as pavement, bridges, and railways under budget constraints. In practice, transportation agencies adopt threshold-based rules for maintenance planning because they are intuitive and easy to implement. However, the thresholds are often determined based on engineering judgment without any systematic approach. Therefore, maintenance budgets cannot be used effectively and facility conditions are not optimized. This research uses hybrid dynamic models to represent threshold-based maintenance for transportation infrastructure in a realistic manner. Hybrid dynamic models combine continuous states such as pavement roughness and age with discrete states such as maintenance history. These models are also capable of considering multiple maintenance actions with heterogeneous effects. Based on facility conditions and maintenance thresholds, corresponding maintenance actions are selected automatically and the facility switches between deterioration modes to reflect the effects of the chosen action. Furthermore, to consider users’ reactions to maintenance actions and accurately predict deterioration for a network of facilities, threshold-based maintenance is formulated as an upper-level problem, and user response is incorporated as a lower-level problem. This leads to a bi-level programming problem where maintenance thresholds are decision variables, which is solved with a modified tabu search algorithm. The proposed methodology is validated with the road network of an urban area and the generated maintenance thresholds are reasonable and robust, which shows that the methodology has great potential to support transportation infrastructure life-cycle management in practice.

James C. Chu; Yin-Jay Chen

2012-01-01T23:59:59.000Z

208

A common column density threshold for scattering at 3.6 mum and water-ice in molecular clouds  

E-Print Network (OSTI)

Context: Observations of scattered light in the 1-5 $\\mu$m range have revealed dust grains in molecular cores with sizes larger than commonly inferred for the diffuse interstellar medium. It is currently unclear whether these grains are grown within the molecular cores or are an ubiquitous component of the interstellar medium. Aims: We investigate whether the large grains necessary for efficient scattering at 1-5 mum are associated with the abundance of water-ice within molecular clouds and cores. Methods: We combined water-ice abundance measurements for sight lines through the Lupus IV molecular cloud complex with measurements of the scattered light at 3.6 mum for the same sight lines. Results: We find that there is a similar threshold for the cores in emission in scattered light at 3.6 mum (tau_9.7=0.15pm0.05, A_K=0.4pm0.2 as water-ice (tau_9.7=0.11pm0.01, A_K=0.19pm0.04) and that the scattering efficiency increases as the relative water-ice abundance increases. The ice layer increases the average grain siz...

Andersen, M; Steinacker, J; Tothill, N

2014-01-01T23:59:59.000Z

209

Cryogenic ion implantation near amorphization threshold dose for halo/extension junction improvement in sub-30 nm device technologies  

SciTech Connect

We report on junction advantages of cryogenic ion implantation with medium current implanters. We propose a methodical approach on maximizing cryogenic effects on junction characteristics near the amorphization threshold doses that are typically used for halo implants for sub-30 nm technologies. BF{sub 2}{sup +} implant at a dose of 8 Multiplication-Sign 10{sup 13}cm{sup -2} does not amorphize silicon at room temperature. When implanted at -100 Degree-Sign C, it forms a 30 - 35 nm thick amorphous layer. The cryogenic BF{sub 2}{sup +} implant significantly reduces the depth of the boron distribution, both as-implanted and after anneals, which improves short channel rolloff characteristics. It also creates a shallower n{sup +}-p junction by steepening profiles of arsenic that is subsequently implanted in the surface region. We demonstrate effects of implant sequences, germanium preamorphization, indium and carbon co-implants for extension/halo process integration. When applied to sequences such as Ge+As+C+In+BF{sub 2}{sup +}, the cryogenic implants at -100 Degree-Sign C enable removal of Ge preamorphization, and form more active n{sup +}-p junctions and steeper B and In halo profiles than sequences at room temperature.

Park, Hugh; Todorov, Stan; Colombeau, Benjamin; Rodier, Dennis; Kouzminov, Dimitry; Zou Wei; Guo Baonian; Khasgiwale, Niranjan; Decker-Lucke, Kurt [Applied Materials, Varian Semiconductor Equipment, 35 Dory Road, Gloucester, Massachusetts 01930 (United States)

2012-11-06T23:59:59.000Z

210

Image registration method for medical image sequences  

DOE Patents (OSTI)

Image registration of low contrast image sequences is provided. In one aspect, a desired region of an image is automatically segmented and only the desired region is registered. Active contours and adaptive thresholding of intensity or edge information may be used to segment the desired regions. A transform function is defined to register the segmented region, and sub-pixel information may be determined using one or more interpolation methods.

Gee, Timothy F.; Goddard, James S.

2013-03-26T23:59:59.000Z

211

The torque dependence of the H-mode power threshold in hydrogen, deuterium and helium plasmas in DIII-D  

SciTech Connect

On DIII-D, the H-mode power threshold has been determined for hydrogen, deuterium and helium plasmas heated by neutral beam injection and/or by electron cyclotron heating and as a function of the applied torque plasmas for plasma configurations in the favourable ion grad-B drift direction. The H-mode threshold power has been determined to increase with input torque for all the main ion species (hydrogen, deuterium and helium). The H-mode threshold power for similar plasma parameters and configurations is the least for deuterium, followed by helium and hydrogen in that order. The plasma geometry also affects the power threshold, which is dependent on the X-point height.

Gohil, P. [General Atomics; Jernigan, T. C. [Oak Ridge National Laboratory (ORNL); Osborne, T.H. [General Atomics, San Diego; Scoville, J. T. [General Atomics, San Diego; Strait, E. J. [General Atomics

2010-01-01T23:59:59.000Z

212

Roughening of a Si(100) surface induced by the adsorption of oxygen near the solid-oxide nucleation threshold  

Science Journals Connector (OSTI)

An investigation of the processes on a Si(100) surface interacting with oxygen near the solid-oxide nucleation threshold using x-ray photoelectron spectroscopy and atomic-force microscopy is described. The nuclea...

V. D. Borman; Yu. Yu. Lebedinskii…

1998-07-01T23:59:59.000Z

213

Theory of the temperature dependence of the threshold current of an InGaAsP laser  

SciTech Connect

The threshold current of an InGaAsP laser is calculated, where the radiative emission, reflection and absorption losses, and Auger recombination are considered. Moreover, the enhancement of the threshold carrier density at high temperatures is an important point. A mechanism for this enhancement is discussed. Then we obtain an excellent agreement with the measured temperature dependence of the threshold current, in particular the T /SUB o/ -values for Tgreater than or equal toT /SUB B/ and the break point T /SUB B/ . The reason for this break point is that the radiative recombination dominates for T < T /SUB B/ , whereas the strongly temperature dependent valence band Auger process becomes more and more important for T > T /SUB B/ . It is this process which causes the strong increase of the threshold current in the room temperature range.

Haug, A.

1985-06-01T23:59:59.000Z

214

Wave-packet propagation based calculation of above-threshold ionization in the x-ray regime  

E-Print Network (OSTI)

We investigate the multi-photon process of above-threshold ionization for the light elements hydrogen, carbon, nitrogen and oxygen in the hard x-ray regime. Numerical challenges are discussed and by comparing Hartree-Fock-Slater calculations to configuration-interaction-singles results we justify the mean-field potential approach in this regime. We present a theoretical prediction of two-photon above-threshold-ionization cross sections for the mentioned elements. Moreover, we study how the importance of above-threshold ionization varies with intensity. We find that for carbon, at x-ray intensities around $10^{23}{\\rm Wcm}^{-2}$, two-photon above-threshold ionization of the K-shell electrons is as probable as one-photon ionization of the L-shell electrons.

Tilley, Matthew; Santra, Robin

2015-01-01T23:59:59.000Z

215

Investigation of channel width-dependent threshold voltage variation in a-InGaZnO thin-film transistors  

SciTech Connect

This Letter investigates abnormal channel width-dependent threshold voltage variation in amorphous indium-gallium-zinc-oxide (a-IGZO) thin-film transistors. Unlike drain-induced source barrier lowering effect, threshold voltage increases with increasing drain voltage. Furthermore, the wider the channel, the larger the threshold voltage observed. Because of the surrounding oxide and other thermal insulating material and the low thermal conductivity of the IGZO layer, the self-heating effect will be pronounced in wider channel devices and those with a larger operating drain bias. To further clarify the physical mechanism, fast IV measurement is utilized to demonstrate the self-heating induced anomalous channel width-dependent threshold voltage variation.

Liu, Kuan-Hsien; Chou, Wu-Ching [Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan (China); Chang, Ting-Chang, E-mail: tcchang@mail.phys.nsysu.edu.tw [Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); Advanced Optoelectronics Technology Center, National Cheng Kung University, Taiwan (China); Wu, Ming-Siou; Hung, Yi-Syuan; Sze, Simon M. [Department of Electronics Engineering, National Chiao Tung University, Hsinchu, Taiwan (China); Hung, Pei-Hua; Chu, Ann-Kuo [Department of Photonics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); Hsieh, Tien-Yu [Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); Yeh, Bo-Liang [Advanced Display Technology Research Center, AU Optronics, No. 1, Li-Hsin Rd. 2, Hsinchu Science Park, Hsinchu 30078, Taiwan (China)

2014-03-31T23:59:59.000Z

216

Renormalization Group Evolution of Neutrino Parameters in Presence of Seesaw Threshold Effects and Majorana Phases  

E-Print Network (OSTI)

We examine the renormalization group evolution (RGE) for different mixing scenarios in the presence of seesaw threshold effects from high energy scale (GUT) to the low electroweak (EW) scale in the Standard Model (SM) and the Minimal Supersymmetric Standard Model (MSSM). We consider four mixing scenarios namely Tri-Bimaximal Mixing, Bimaximal Mixing, Hexagonal Mixing and Golden Ratio Mixing which come from different flavor symmetries at the GUT scale. All these mixing scenarios give vanishing reactor angle ($\\theta_{13}$) and maximal atmospheric mixing angle. The solar mixing angle has different value for all four cases. In the light of non zero value of $\\theta_{13}$ it becomes interesting to study the present status of these symmetries, i.e. whether they can generate the current neutrino oscillation data at low energy scale or not. We find that the Majorana phases play an important role in the RGE running of these mixing patterns along with the seesaw threshold corrections. We present a comparative study of the RGE of all these mixing scenarios both with and without Majorana CP phases when seesaw threshold corrections are taken into consideration. We find that in the absence of these Majorana phases both the RGE running and seesaw effects may lead to $\\theta_{13}energies both in the SM and the MSSM. However, if the Majorana phases are incorporated to the mixing matrix the running can be enhanced both in the SM and the MSSM. Even by incorporating non zero Majorana CP phases in the SM, we do not get $\\theta_{13}$ in its present 3$\\sigma$ range. The current values of the two mass squared differences and mixing angles including $\\theta_{13}$ can be produced in the MSSM case with tan$\\beta$ = 10 and non zero Majorana CP phases at low energy.

Shivani Gupta; Sin Kyu Kang; C. S. Kim

2014-06-29T23:59:59.000Z

217

Modeling of recurrent threshold crossings due to noise with long memory  

E-Print Network (OSTI)

? of the signal by an additive Gaussian noise which optimizes the SNR at the output of a stochastic resonator. Using a simple Level Crossing Detector (LCD) which is a stochastic resonator without internal dynamics, we are able to achieve a maximum at the output... of the LCD for a particular level of input noise. The LCD works in such a way that a short uniform spike is initiated at its output whenever the voltage at its input goes through a given voltage level, the threshold voltage, in the increasing direction...

Singh, Abhishek Narayan

2007-04-25T23:59:59.000Z

218

Threshold resummation for W±Z and ZZ pair production at the LHC  

Science Journals Connector (OSTI)

We perform the threshold resummation for W±Z and ZZ pair production at the next-to-next-to-leading logarithmic accuracy in soft-collinear effective theory at the LHC. Our results show that the resummation effects increase the total cross sections by about 7% for ZZ production and 12% for W±Z production with S=7, 8, 13 and 14 TeV, respectively, and the scale uncertainties are significantly reduced. Besides, our numerical results are consistent with experimental data reported by the ATLAS and CMS collaborations.

Yan Wang; Chong Sheng Li; Ze Long Liu; Ding Yu Shao

2014-08-11T23:59:59.000Z

219

Effect of Neoclassical Toroidal Viscosity on Error-Field Penetration Thresholds in Tokamak Plasmas  

SciTech Connect

A model for field-error penetration is developed that includes nonresonant as well as the usual resonant field-error effects. The nonresonant components cause a neoclassical toroidal viscous torque that keeps the plasma rotating at a rate comparable to the ion diamagnetic frequency. The new theory is used to examine resonant error-field penetration threshold scaling in Ohmic tokamak plasmas. Compared to previous theoretical results, we find the plasma is less susceptible to error-field penetration and locking, by a factor that depends on the nonresonant error-field amplitude.

Cole, A. J.; Hegna, C. C.; Callen, J. D. [University of Wisconsin, Madison, Wisconsin 53706-1609 (United States)

2007-08-10T23:59:59.000Z

220

Self-sputtering far above the runaway threshold: an extraordinary metal ion generator  

SciTech Connect

When self-sputtering is driven far above the runaway threshold voltage, energetic electrons are made available to produce"excess plasma" far from the magnetron target. Ionization balance considerations show that the secondary electrons deliver the necessary energy to the"remote" zone. Thereby, such a system can be an extraordinarily prolific generator of useable metal ions. Contrary to other known sources, the ion current to a substrate can exceed the discharge current. For gasless self-sputtering of copper, the useable ion current scales exponentially with the discharge voltage.

Andersson, Joakim; Anders, Andre

2008-12-16T23:59:59.000Z

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

T-odd polarization observables in the photoproduction of charmed particles near threshold  

Science Journals Connector (OSTI)

The imaginary part of the matrix element for associative charm particle photoproduction, ?+N??c+D¯, has a definite spin structure, near the reaction threshold, being characterized by a single parameter. This allows us to predict, in the framework of an effective Lagrangian approach, the energy and the angular dependence of T-odd polarization observables such as the analyzing power in the reaction ?+p???c+D¯ and the polarization of the ?c hyperon, produced in the collision of unpolarized particles. We find sizable values for these observables, which can be measured experimentally.

Michail P. Rekalo and Egle Tomasi-Gustafsson

2001-12-11T23:59:59.000Z

222

Final state interactions at the threshold of Higgs boson pair production  

E-Print Network (OSTI)

We study the effect of final state interactions at the threshold of Higgs boson pair production in the Glashow-Weinberg-Salam model. We consider three major processes of the pair production in the model: lepton pair annihilation, ZZ fusion, and WW fusion. We find that the corrections caused by the effect for these processes are markedly different. According to our results, the effect can cause non-negligible corrections to the cross sections for lepton pair annihilation and small corrections for ZZ fusion, and this effect is negligible for WW fusion.

Zhang, Zhentao

2015-01-01T23:59:59.000Z

223

Mechanical fluctuations suppress the threshold of soft-glassy solids : the secular drift scenario  

E-Print Network (OSTI)

We propose a dynamical mechanism leading to the fluidization of soft-glassy amorphous mate-rial driven below the yield-stress by external mechanical fluctuations. The model is based on the combination of memory effect and non-linearity, leading to an accumulation of tiny effects over a long-term. We test this scenario on a granular packing driven mechanically below the Coulomb threshold. We bring evidences for an effective viscous response directly related to small stress modulations in agreement with the theoretical prediction of a generic secular drift.

Adeline Pons; Axelle Amon; Thierry Darnige; Jérôme Crassous; Eric Clément

2014-12-10T23:59:59.000Z

224

QCD CORRECTIONS TO DILEPTON PRODUCTION NEAR PARTONIC THRESHOLD IN PP SCATTERING.  

SciTech Connect

We present a recent study of the QCD corrections to dilepton production near partonic threshold in transversely polarized {bar p}p scattering, We analyze the role of the higher-order perturbative QCD corrections in terms of the available fixed-order contributions as well as of all-order soft-gluon resummations for the kinematical regime of proposed experiments at GSI-FAIR. We find that perturbative corrections are large for both unpolarized and polarized cross sections, but that the spin asymmetries are stable. The role of the far infrared region of the momentum integral in the resummed exponent and the effect of the NNLL resummation are briefly discussed.

SHIMIZU, H.; STERMAN, G.; VOGELSANG, W.; YOKOYA, H.

2005-10-02T23:59:59.000Z

225

Method and apparatus for analog pulse pile-up rejection  

DOE Patents (OSTI)

A method and apparatus for pulse pile-up rejection are disclosed. The apparatus comprises a delay value application constituent configured to receive a threshold-crossing time value, and provide an adjustable value according to a delay value and the threshold-crossing time value; and a comparison constituent configured to receive a peak-occurrence time value and the adjustable value, compare the peak-occurrence time value with the adjustable value, indicate pulse acceptance if the peak-occurrence time value is less than or equal to the adjustable value, and indicate pulse rejection if the peak-occurrence time value is greater than the adjustable value.

De Geronimo, Gianluigi

2014-11-18T23:59:59.000Z

226

Frequency dependence of thresholds for ultrasonic production of thermal lesions in tissue  

Science Journals Connector (OSTI)

The ultrasonic intensity threshold for producing lesions in mammalian brain tissue is not a strong function of frequency (over the range of 1–10 MHz) for exposures longer than 1 sec. A model is presented to explain this apparent lack of frequency dependence. It is assumed that the maximum temperature developed in the lesion volume for a given pulse duration is determined (1) by the absorption coefficient of that tissue and (2) by the distribution of the acoustic intensity over the treated volume (sharpness of the beam). The former is observed experimentally to be nearly linearly dependent upon frequency in the range 1–10 MHz and the latter for a good lens is related inversely to frequency. Temperature calculations which account for heat loss by diffusion as well as the frequency dependence for the beam geometry and the absorption coefficient are presented. These lead to nearly frequency independent curves for threshold dosages beyond 1?sec exposure giving credence to the suggestion that thermal processes may be predominant for such exposures.

R. M. Lerner; E. L. Carstensen; F. Dunn

1973-01-01T23:59:59.000Z

227

Threshold condition for traveling wave excitation in an annular prime?mover  

Science Journals Connector (OSTI)

The threshold condition for thermoacoustic instability in an annular prime?mover is derived. The region of spatially inhomogeneous temperature distribution (due to the presence of a stack and hot and cold heat exchangers) is assumed to be acoustically thin. The interaction of acoustic waves with the stack is assumed to be quasiadiabatic. Theoretical approach (based on the transformation of differential wave equation into Volterra integral equation which is solved by iterative procedure) is valid for arbitrary spatial temperature distribution. Nevertheless it was found that the threshold for the excitation of a traveling acoustic wave does not depend on the details of temperature spatial distribution but just on the ratio of the temperatures of hot and cold heat exchangers. Moreover the critical temperature ratio does not depend on the thickness of the stack if the acoustic losses inside the heated region are negligible in comparison with acoustic losses in the rest part of the annular system. In this important limiting case critical temperature ratio diminishes when the dimensions of the system are scaled up. [Work supported by DGA.

T. Le Polles; S. Job; H. Bailliet; P. Lotton; M. Bruneau; V. Gusev

1999-01-01T23:59:59.000Z

228

A study on reactor core failure thresholds to safety operation of LMFBR  

SciTech Connect

Japan Nuclear Safety Organization (JNES) has been developing the methodology and computer codes for applying level-1 PSA to LMFBR. Many of our efforts have been directed to the judging conditions of reactor core damage and the time allowed to initiate the accident management. Several candidates of the reactor core failure threshold were examined to a typical proto-type LMFBR with MOX fuel based on the plant thermal-hydraulic analyses to the actual progressions leading to the core damage. The results of the present study showed that the judging condition of coolant-boundary integrity failure, 750 degree-C of the boundary temperature, is enough as the threshold of core damage to PLOHS (protected loss-of-heat sink). High-temperature fuel cladding creep failure will not take place before the coolant-boundary reaches the judging temperature and sodium boiling will not occur due to the system pressure rise. In cases of ATWS (anticipated transient without scrum) the accident progression is so fast and the reactor core damage will be inevitable even a realistic negative reactivity insertion due to the temperature rise is considered. Only in the case of ULOHS (unprotected loss-of-heat sink) a relatively long time of 11 min will be allowed till the shut-down of the reactor before the core damage. (authors)

Kazuo, Haga; Hiroshi, Endo; Tomoko, Ishizu; Yoshihisa, Shindo [Japan Nuclear Energy Safety Organization, Safety Analysis and Evaluation Division, Kamiya-cho MT Bldg., 4-3-20, Toranomon, Minato-ku, Tokyo (Japan)

2006-07-01T23:59:59.000Z

229

Production of K+K? pairs in proton-proton collisions below the ? meson threshold  

The pp?ppK+K? reaction was measured below the ? threshold at a beam energy of 2.568 GeV using the COSY-ANKE magnetic spectrometer. By assuming that the four-body phase space is distorted only by the product of two-body final-state interactions, fits to a variety of one-dimensional distributions permit the evaluation of differential and total cross sections. The shapes of the distributions in the Kp and Kpp invariant masses are reproduced only if the K?p interaction is even stronger than that found at higher energy. The cusp effect in the K+K? distribution at the K0K{bar}0 threshold is much more clear and some evidence is also found for coupling between the K?p and K?0n channels. However, the energy dependence of the total cross section cannot be reproduced by considering only a simple product of such pairwise final-state interactions.

Ye, Q. J.; Hartmann, M.; Chiladze, D.; Dymov, S.; Dzyuba, A.; Gao, H.; Gebel, R.; Hejny, V.; Kacharava, A.; Lorentz, B.; Mchedlishvili, D.; Merzliakov, S.; Mielke, M.; Mikirtytchiants, S.; Ohm, H.; Papenbrock, M.; Polyanskiy, A.; Serdyuk, V.; Stein, H. J.; Ströher, H.; Trusov, S.; Valdau, Yu.; Wilkin, C.; Wüstner, P.

2013-06-01T23:59:59.000Z

230

A precision measurement of the $p$($e,e^\\prime p\\,$)$?^0$ reaction at threshold  

E-Print Network (OSTI)

New results are reported from a measurement of $\\pi^0$ electroproduction near threshold using the $p(e,e^{\\prime} p)\\pi^0$ reaction. The experiment was designed to determine precisely the energy dependence of $s-$ and $p-$wave electromagnetic multipoles as a stringent test of the predictions of Chiral Perturbation Theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the $\\phi^*_{\\pi}$ and $\\theta^*_{\\pi}$ angles in the $p \\pi^0$ center-of-mass was obtained for invariant energies above threshold from 0.5 MeV up to 15 MeV. The 4-momentum transfer $Q^2$ coverage ranges from 0.05 to 0.155 (GeV/c)$^2$ in fine steps. A simple phenomenological analysis of our data shows strong disagreement with $p-$wave predictions from ChPT for $Q^2>0.07$ (GeV/c)$^2$, while the $s-$wave predictions are in reasonable agreement.

K. Chirapatpimol; M. H. Shabestari; R. A. Lindgren; L. C. Smith; J. R. M. Annand; D. W. Higinbotham; B. Moffit; V. Nelyubin; B. E. Norum; K. Allada; K. Aniol; K. Ardashev; D. S. Armstrong; R. A. Arndt; F. Benmokhtar; A. M. Bernstein; W. Bertozzi; W. J. Briscoe; L. Bimbot; A. Camsonne; J. -P. Chen; S. Choi; E. Chudakov; E. Cisbani; F. Cusanno; M. M. Dalton; C. Dutta; K. Egiyan; C. Fernandez-Ramirez; R. Feuerbach; K. G. Fissum; S. Frullani; F. Garibaldi; O. Gayou; R. Gilman; S. Gilad; J. Goity; J. Gomez; B. Hahn; D. Hamilton; J. -O. Hansen; J. Huang; R. Igarashi; D. Ireland; C. W. de Jager; X. Jin; X. Jiang; T. Jinasundera; J. Kellie; C. E. Keppel; N. Kolb; J. LeRose; N. Liyanage; K. Livingston; D. McNulty; L. Mercado; R. Michaels; M. Mihovilovic; S. Qian; X. Qian; S. Mailyan; V. Mamyan; S. Marrone; P. Monaghan; S. Nanda; C. F. Perdrisat; E. Piasetzky; D. Protopopescu; V. Punjabi; Y. Qiang; I. A. Rachek; A. Rakhman; G. Ron; G. Rosner; A. Saha; B. Sawatzky; A. Shahinyan; S. Sirca; N. Sparveris; R. R. Subedi; R. Suleiman; I. Strakovsky; V. Sulkosky; J. Moinelo; H. Voskanyan; K. Wang; Y. Wang; J. Watson; D. Watts; B. Wojtsekhowski; R. L. Workman; H. Yao; X. Zhan; Y. Zhang

2015-02-08T23:59:59.000Z

231

Logic gates at the surface code threshold: Superconducting qubits poised for fault-tolerant quantum computing  

E-Print Network (OSTI)

A quantum computer can solve hard problems - such as prime factoring, database searching, and quantum simulation - at the cost of needing to protect fragile quantum states from error. Quantum error correction provides this protection, by distributing a logical state among many physical qubits via quantum entanglement. Superconductivity is an appealing platform, as it allows for constructing large quantum circuits, and is compatible with microfabrication. For superconducting qubits the surface code is a natural choice for error correction, as it uses only nearest-neighbour coupling and rapidly-cycled entangling gates. The gate fidelity requirements are modest: The per-step fidelity threshold is only about 99%. Here, we demonstrate a universal set of logic gates in a superconducting multi-qubit processor, achieving an average single-qubit gate fidelity of 99.92% and a two-qubit gate fidelity up to 99.4%. This places Josephson quantum computing at the fault-tolerant threshold for surface code error correction. Our quantum processor is a first step towards the surface code, using five qubits arranged in a linear array with nearest-neighbour coupling. As a further demonstration, we construct a five-qubit Greenberger-Horne-Zeilinger (GHZ) state using the complete circuit and full set of gates. The results demonstrate that Josephson quantum computing is a high-fidelity technology, with a clear path to scaling up to large-scale, fault-tolerant quantum circuits.

R. Barends; J. Kelly; A. Megrant; A. Veitia; D. Sank; E. Jeffrey; T. C. White; J. Mutus; A. G. Fowler; B. Campbell; Y. Chen; Z. Chen; B. Chiaro; A. Dunsworth; C. Neill; P. O`Malley; P. Roushan; A. Vainsencher; J. Wenner; A. N. Korotkov; A. N. Cleland; John M. Martinis

2014-02-19T23:59:59.000Z

232

Threshold concentrations in zinc-doped lithium niobate crystals and their structural conditionality  

SciTech Connect

On the basis of precise X-ray diffraction study of lithium niobate single crystals of congruent composition and four zinc-doped (at 2.8, 5.2, 7.6, and 8.2 mol %) crystals, structural conditionality of the threshold concentrations of the dopant has been established. At these concentrations, the mechanism of zinc incorporation into crystal changes. As the zinc concentration increases, this element first substitutes excess niobium, localized in lithium positions, with a simultaneous decrease in the number of vacancies in these positions. Then zinc substitutes lithium with formation of new lithium vacancies. When a certain limit on the number of vacancies is reached, zinc begins to substitute niobium in its main positions. This process is naturally accompanied by a decrease in the number of vacancies to their complete disappearance and formation of a self-compensating crystal. The character of the dependence of the crystal physical properties on the dopant concentration changes specifically when the impurity concentration passes through the threshold values.

Chernaya, T. S.; Volk, T. R.; Verin, I. A.; Simonov, V. I., E-mail: simonov@ns.crys.ras.ru [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)

2008-07-15T23:59:59.000Z

233

Effects of temporal correlations on cascades: Threshold models on temporal networks  

Science Journals Connector (OSTI)

A person's decision to adopt an idea or product is often driven by the decisions of peers, mediated through a network of social ties. A common way of modeling adoption dynamics is to use threshold models, where a node may become an adopter given a high enough rate of contacts with adopted neighbors. We study the dynamics of threshold models that take both the network topology and the timings of contacts into account, using empirical contact sequences as substrates. The models are designed such that adoption is driven by the number of contacts with different adopted neighbors within a chosen time. We find that while some networks support cascades leading to network-level adoption, some do not: the propagation of adoption depends on several factors from the frequency of contacts to burstiness and timing correlations of contact sequences. More specifically, burstiness is seen to suppress cascade sizes when compared to randomized contact timings, while timing correlations between contacts on adjacent links facilitate cascades.

Ville-Pekka Backlund; Jari Saramäki; Raj Kumar Pan

2014-06-26T23:59:59.000Z

234

An evaluation of crack front effect on threshold and crack propagation  

SciTech Connect

That a through-thickness crack may exhibit over the entire fatigue crack propagation (FCP) regime morphological variations such as curvature, deviation and deflection appears to be very common. This effect is hereafter referred to as the crack front effect (CFE). It includes the practical consequence that when CFE occurs, local crack length, and hence the surface and the through-thickness data derived, tend to differ. Apparently, the difference should not be significant a least for thin specimens, for which data acquisition on one face suffices, and therefore, problems resulting from CFE can be neglected in certain cases. The authors became involved in the CFE problem while studying hysteresis effects in the threshold regime, particularly when post-threshold non-propagation was observed on the surface. In brief, the specimens had a section thickness of 4mm, i.e., relatively thin (B/W = 0.066), and according to the ASIM test recommendations the surface data should have been accurate. The major questions which arose were, however, whether surface and through-thickness effects are comparable, and how reliable surface observations are. Pure copper was chosen as the material since it exhibits a mixed mode fracture path, and thus should be inherently prone to yield CFE.

Vaidya, W.V.

1989-01-01T23:59:59.000Z

235

Reaction {pi}N {yields} {pi}{pi}N near threshold  

SciTech Connect

The LAMPF E1179 experiment used the {pi}{sup 0} spectrometer and an array of charged particle range counters to detect and record {pi}{sup +}{pi}{sup 0}, {pi}{sup 0}p, and {pi}{sup +}{pi}{sup 0}p coincidences following the reaction {pi}{sup +}p {yields} {pi}{sup 0}{pi}{sup +}p near threshold. The total cross sections for single pion production were measured at the incident pion kinetic energies 190, 200, 220, 240, and 260 MeV. Absolute normalizations were fixed by measuring {pi}{sup +}p elastic scattering at 260 MeV. A detailed analysis of the {pi}{sup 0} detection efficiency was performed using cosmic ray calibrations and pion single charge exchange measurements with a 30 MeV {pi}{sup {minus}} beam. All published data on {pi}N {yields} {pi}{pi}N, including our results, are simultaneously fitted to yield a common chiral symmetry breaking parameter {xi} ={minus}0.25{plus_minus}0.10. The threshold matrix element {vert_bar}{alpha}{sub 0}({pi}{sup 0}{pi}{sup +}p){vert_bar} determined by linear extrapolation yields the value of the s-wave isospin-2 {pi}{pi} scattering length {alpha}{sub 0}{sup 2}({pi}{pi}) = {minus}0.041{plus_minus}0.003 m{sub {pi}}{sup {minus}1}, within the framework of soft-pion theory.

Frlez, E.

1993-11-01T23:59:59.000Z

236

Bound and resonance states of the dipolar anion of hydrogen cyanide: competition between threshold effects and rotation in an open quantum system  

E-Print Network (OSTI)

Bound and resonance states of the dipole-bound anion of hydrogen cyanide HCN$^-$ are studied using a non-adiabatic pseudopotential method and the Berggren expansion technique involving bound states, decaying resonant states, and non-resonant scattering continuum. We devise an algorithm to identify the resonant states in the complex energy plane. To characterize spatial distributions of electronic wave functions, we introduce the body-fixed density and use it to assign families of resonant states into collective rotational bands. We find that the non-adiabatic coupling of electronic motion to molecular rotation results in a transition from the strong-coupling to weak-coupling regime. In the strong coupling limit, the electron moving in a subthreshold, spatially extended halo state follows the rotational motion of the molecule. Above the ionization threshold, electron's motion in a resonance state becomes largely decoupled from molecular rotation. Widths of resonance-band members depend primarily on the electro...

Fossez, K; Nazarewicz, W; P?oszajczak, M; Jaganathen, Y

2014-01-01T23:59:59.000Z

237

Impact of contaminates on the laser damage threshold of 1w HR coatings  

SciTech Connect

In operational laser systems, it is often difficult to keep optical components completely free of foreign material. We have investigated the performance of high damage threshold 1.053 {micro}m high reflectors in the presence of surface contaminants. We have looked at the impact of stainless steel, aluminum, Azurlite{reg_sign}, dust, cotton fibers and polyester fibers on the performance of the mirrors under laser irradiation. The first four contaminants were deposited in sizes ranging from 30 microns to 150 microns. The fibers included lengths ranging to several millimeters. The testing was done at either a single fluence in the range of 6 J/cm{sup 2} to 24 J/cm{sup 2}, or a ramped sequence of shots starting at 1 J/cm{sup 2}. We will present data showing the onset of damage, the type of damage, and the propensity to damage growth in the fluence range studied.

Norton, M A; Stolz, C J; Donohue, E; Hollingsworth, W G; Listiyo, K; Pryatel, J A; Hackel, R P

2005-10-28T23:59:59.000Z

238

Modeling of damage generation mechanisms in silicon at energies below the displacement threshold  

Science Journals Connector (OSTI)

We have used molecular dynamics simulation techniques to study the generation of damage in Si within the low-energy deposition regime. We have demonstrated that energy transfers below the displacement threshold can produce a significant amount of damage, usually neglected in traditional radiation damage calculations. The formation of amorphous pockets agrees with the thermal spike concept of local melting. However, we have found that the order-disorder transition is not instantaneous, but it requires some time to reach the appropriate kinetic-potential energy redistribution for melting. The competition between the rate of this energy redistribution and the energy diffusion to the surrounding atoms determines the amount of damage generated by a given deposited energy. Our findings explain the diverse damage morphology produced by ions of different masses.

Iván Santos; Luis A. Marqués; Lourdes Pelaz

2006-11-21T23:59:59.000Z

239

Dynamics of strangeness production in heavy-ion collisions near threshold energies  

E-Print Network (OSTI)

Within the framework of the improved isospin dependent quantum molecular dynamics (ImIQMD) model, the dynamics of strangeness (K$^{0,+}$, $\\Lambda$ and $\\Sigma^{-,0,+}$) production in heavy-ion collisions near threshold energies is investigated systematically, in which the strange particles are considered to be mainly produced by the inelastic collisions of baryon-baryon and pion-baryon. The collisions in the region of supra-saturation densities of the dense baryonic matter formed in heavy-ion collisions dominate the yields of strangeness production. The total multiplicities as functions of incident energies and collision centralities are calculated with the Skyrme parameter SLy6. The excitation function of strangeness production is analyzed and also compared with the KaoS data for the K$^{+}$ production in the reactions $^{12}$C+$^{12}$C and $^{197}$Au+$^{197}$Au.

Zhao-Qing Feng; Gen-Ming Jin

2010-10-13T23:59:59.000Z

240

Double-metal-gate nanocrystalline Si thin film transistors with flexible threshold voltage controllability  

SciTech Connect

We fabricated nano-crystalline Si (nc-Si:H) thin-film transistors (TFTs) with a double-metal-gate structure, which showed a high electron-mobility (?{sub FE}) and adjustable threshold voltages (V{sub th}). The nc-Si:H channel and source/drain (S/D) of the multilayered TFT were deposited at 375?°C by inductively coupled plasma chemical vapor deposition. The low grain-boundary defect density of the channel layer is responsible for the high ?{sub FE} of 370 cm{sup 2}/V-s, a steep subthreshold slope of 90?mV/decade, and a low V{sub th} of ?0.64?V. When biased with the double-gate driving mode, the device shows a tunable V{sub th} value extending from ?1?V up to 2.7?V.

Chiou, Uio-Pu; Pan, Fu-Ming, E-mail: fmpan@faculty.nctu.edu.tw [Department of Materials Science and Engineering, National Chiao-Tung University, Hsinchu 30050, Taiwan (China)] [Department of Materials Science and Engineering, National Chiao-Tung University, Hsinchu 30050, Taiwan (China); Shieh, Jia-Min, E-mail: jmshieh@narlabs.org.tw, E-mail: jmshieh@faculty.nctu.edu.tw [National Nano Device Laboratories, No. 26, Prosperity Road 1, Hsinchu 30078, Taiwan (China) [National Nano Device Laboratories, No. 26, Prosperity Road 1, Hsinchu 30078, Taiwan (China); Departments of Photonics and Institute of Electro-Optical Engineering, National Chiao-Tung University, Hsinchu 30010, Taiwan (China); Yang, Chih-Chao [National Nano Device Laboratories, No. 26, Prosperity Road 1, Hsinchu 30078, Taiwan (China)] [National Nano Device Laboratories, No. 26, Prosperity Road 1, Hsinchu 30078, Taiwan (China); Huang, Wen-Hsien [Department of Materials Science and Engineering, National Chiao-Tung University, Hsinchu 30050, Taiwan (China) [Department of Materials Science and Engineering, National Chiao-Tung University, Hsinchu 30050, Taiwan (China); National Nano Device Laboratories, No. 26, Prosperity Road 1, Hsinchu 30078, Taiwan (China); Kao, Yo-Tsung [Departments of Photonics and Institute of Electro-Optical Engineering, National Chiao-Tung University, Hsinchu 30010, Taiwan (China)] [Departments of Photonics and Institute of Electro-Optical Engineering, National Chiao-Tung University, Hsinchu 30010, Taiwan (China)

2013-11-11T23:59:59.000Z

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Effective temperature of an ultracold electron source based on near-threshold photoionization  

Science Journals Connector (OSTI)

Abstract We present a detailed description of measurements of the effective temperature of a pulsed electron source, based on near-threshold photoionization of laser-cooled atoms. The temperature is determined by electron beam waist scans, source size measurements with ion beams, and analysis with an accurate beam line model. Experimental data is presented for the source temperature as a function of the wavelength of the photoionization laser, for both nanosecond and femtosecond ionization pulses. For the nanosecond laser, temperatures as low as 14±3 K were found; for femtosecond photoionization, 30±5 K is possible. With a typical source size of 25 ? m , this results in electron bunches with a relative transverse coherence length in the 10?4 range and an emittance of a few nm rad.

W.J. Engelen; E.P. Smakman; D.J. Bakker; O.J. Luiten; E.J.D. Vredenbregt

2014-01-01T23:59:59.000Z

242

Deep sub-threshold $?$ and $?$ production in nuclear collisions with the UrQMD transport model  

E-Print Network (OSTI)

We present results on deep sub threshold hyperon production in nuclear collisions, with the UrQMD transport model. Introducing anti-kaon+baryon and hyperon+hyperon strangeness exchange reactions we obtain a good description of experimental data on single strange hadron production in Ar+KCl reactions at $E_{lab}=1.76$ A GeV. We find that the hyperon strangeness exchange is the dominant process contributing to the $\\Xi^-$ yield, however remains short of explaining the $\\Xi^-/\\Lambda$ ratio measured with the HADES experiment. We also discuss possible reasons for the discrepancy with previous studies and the experimental results, finding that many details of the transport simulation may have significant effects on the final $\\Xi^-$ yield.

G. Graef; J. Steinheimer; Feng Li; Marcus Bleicher

2014-09-28T23:59:59.000Z

243

Threshold-Resummed Cross Section for the Drell-Yan Process in Pion-Nucleon Collisions at COMPASS  

E-Print Network (OSTI)

We present a study of the Drell-Yan process in pion-proton collisions including next-to-leading-logarithmic threshold-resummed contributions. We analyze rapidity-integrated as well as rapidity-differential cross sections in the kinematic regime relevant for the COMPASS fixed target experiment. We find that resummation leads to a significant enhancement of the cross section compared to fixed-order calculations in this regime. Particularly large corrections arise at large forward and backward rapidities of the lepton pair. We also study the scale dependence of the cross section and find it to be substantially reduced by threshold resummation.

Matthias Aicher; Andreas Schäfer; Werner Vogelsang

2011-04-18T23:59:59.000Z

244

Method for microbeam radiation therapy  

DOE Patents (OSTI)

A method is disclosed of performing radiation therapy on a patient, involving exposing a target, usually a tumor, to a therapeutic dose of high energy electromagnetic radiation, preferably X-ray radiation. The dose is in the form of at least two non-overlapping microbeams of radiation, each microbeam having a width of less than about 1 millimeter. Target tissue exposed to the microbeams receives a radiation dose during the exposure that exceeds the maximum dose that such tissue can survive. Non-target tissue between the microbeams receives a dose of radiation below the threshold amount of radiation that can be survived by the tissue, and thereby permits the non-target tissue to regenerate. The microbeams may be directed at the target from one direction, or from more than one direction in which case the microbeams overlap within the target tissue enhancing the lethal effect of the irradiation while sparing the surrounding healthy tissue. No Drawings

Slatkin, D.N.; Dilmanian, F.A.; Spanne, P.O.

1994-08-16T23:59:59.000Z

245

Oxygen and organic matter thresholds for benthic faunal activity on the Pakistan margin oxygen minimum zone (7001100 m)  

E-Print Network (OSTI)

Oxygen and organic matter thresholds for benthic faunal activity on the Pakistan margin oxygen increased animal activity associated with increasing bottom-water oxygen concentration. We examined faunal community responses to oxygen and organic matter gradients across the lower oxygen minimum zone (OMZ

Levin, Lisa

246

Study of the near-threshold $??$ mass enhancement in doubly OZI suppressed $J/?\\to ???$ decays  

E-Print Network (OSTI)

A 2.25$\\times10^8$ $\\jpsi$ event sample accumulated with the BESIII detector is used to study the doubly OZI suppressed decay modes $\\jpsi\\to\\gamma\\of$, $\\omega\\to\\ppp$, $\\phi\\to\\kk$. A strong deviation ($>$ 30$\\sigma$) from three-body $\\jpsi\\to\\gamma\\omega\\phi$ phase space is observed near the $\\omega\\phi$ mass threshold that is consistent with a previous observation reported by the BESII experiment. A partial wave analysis with a tensor covariant amplitude that assumes that the enhancement is due to the presence of a resonance, the X(1810), is performed, and confirms that the spin-parity of the X(1810) is $0^{++}$. The mass and width of the X(1810) are determined to be $M=1795\\pm7$(stat)$^{+13}_{-5}$(syst)$\\pm$19(mod) MeV/$c^2$ and $\\Gamma=95\\pm10$(stat)$^{+21}_{-34}$(syst)$\\pm$75(mod) MeV/$c^2$, respectively, and the product branching fraction is measured to be ${\\cal B}(\\jpsi\\to\\gamma X(1810))\\times{\\cal B}(X(1810)\\to\\of)=(2.00\\pm0.08$(stat)$^{+0.45}_{-1.00}$(syst)$\\pm$1.30(mod))$\\times10^{-4}$. %where the first error is the statistical error and the second the systematical error. These results are consistent within errors with those of the BESII experiment.

M. Ablikim; M. N. Achasov; O. Albayrak; D. J. Ambrose; F. F. An; Q. An; J. Z. Bai; Y. Ban; J. Becker; J. V. Bennett; M. Bertani; J. M. Bian; E. Boger; O. Bondarenko; I. Boyko; R. A. Briere; V. Bytev; X. Cai; O. Cakir; A. Calcaterra; G. F. Cao; S. A. Cetin; J. F. Chang; G. Chelkov; G. Chen; H. S. Chen; J. C. Chen; M. L. Chen; S. J. Chen; X. Chen; Y. B. Chen; H. P. Cheng; Y. P. Chu; D. Cronin-Hennessy; H. L. Dai; J. P. Dai; D. Dedovich; Z. Y. Deng; A. Denig; I. Denysenko; M. Destefanis; W. M. Ding; Y. Ding; L. Y. Dong; M. Y. Dong; S. X. Du; J. Fang; S. S. Fang; L. Fava; C. Q. Feng; R. B. Ferroli; P. Friedel; C. D. Fu; Y. Gao; C. Geng; K. Goetzen; W. X. Gong; W. Gradl; M. Greco; M. H. Gu; Y. T. Gu; Y. H. Guan; A. Q. Guo; L. B. Guo; T. Guo; Y. P. Guo; Y. L. Han; F. A. Harris; K. L. He; M. He; Z. Y. He; T. Held; Y. K. Heng; Z. L. Hou; C. Hu; H. M. Hu; J. F. Hu; T. Hu; G. M. Huang; G. S. Huang; J. S. Huang; L. Huang; X. T. Huang; Y. Huang; Y. P. Huang; T. Hussain; C. S. Ji; Q. Ji; Q. P. Ji; X. B. Ji; X. L. Ji; L. L. Jiang; X. S. Jiang; J. B. Jiao; Z. Jiao; D. P. Jin; S. Jin; F. F. Jing; N. Kalantar-Nayestanaki; M. Kavatsyuk; B. Kopf; M. Kornicer; W. Kuehn; W. Lai; J. S. Lange; M. Leyhe; C. H. Li; Cheng Li; Cui Li; D. M. Li; F. Li; G. Li; H. B. Li; J. C. Li; K. Li; Lei Li; Q. J. Li; S. L. Li; W. D. Li; W. G. Li; X. L. Li; X. N. Li; X. Q. Li; X. R. Li; Z. B. Li; H. Liang; Y. F. Liang; Y. T. Liang; G. R. Liao; X. T. Liao; D. Lin; B. J. Liu; C. L. Liu; C. X. Liu; F. H. Liu; Fang Liu; Feng Liu; H. Liu; H. B. Liu; H. H. Liu; H. M. Liu; H. W. Liu; J. P. Liu; K. Liu; K. Y. Liu; Kai Liu; P. L. Liu; Q. Liu; S. B. Liu; X. Liu; Y. B. Liu; Z. A. Liu; Zhiqiang Liu; Zhiqing Liu; H. Loehner; G. R. Lu; H. J. Lu; J. G. Lu; Q. W. Lu; X. R. Lu; Y. P. Lu; C. L. Luo; M. X. Luo; T. Luo; X. L. Luo; M. Lv; C. L. Ma; F. C. Ma; H. L. Ma; Q. M. Ma; S. Ma; T. Ma; X. Y. Ma; F. E. Maas; M. Maggiora; Q. A. Malik; Y. J. Mao; Z. P. Mao; J. G. Messchendorp; J. Min; T. J. Min; R. E. Mitchell; X. H. Mo; C. Morales Morales; N. Yu. Muchnoi; H. Muramatsu; Y. Nefedov; C. Nicholson; I. B. Nikolaev; Z. Ning; S. L. Olsen; Q. Ouyang; S. PacettiB; J. W. Park; M. Pelizaeus; H. P. Peng; K. Peters; J. L. Ping; R. G. Ping; R. Poling; E. Prencipe; M. Qi; S. Qian; C. F. Qiao; L. Q. Qin; X. S. Qin; Y. Qin; Z. H. Qin; J. F. Qiu; K. H. Rashid; G. Rong; X. D. Ruan; A. Sarantsev; B. D. Schaefer; M. Shao; C. P. Shen; X. Y. Shen; H. Y. Sheng; M. R. Shepherd; X. Y. Song; S. Spataro; B. Spruck; D. H. Sun; G. X. Sun; J. F. Sun; S. S. Sun; Y. J. Sun; Y. Z. Sun; Z. J. Sun; Z. T. Sun; C. J. Tang; X. Tang; I. Tapan; E. H. Thorndike; D. Toth; M. Ullrich; G. S. Varner; B. Q. Wang; D. Wang; D. Y. Wang; K. Wang; L. L. Wang; L. S. Wang; M. Wang; P. Wang; P. L. Wang; Q. J. Wang; S. G. Wang; X. F. Wang; X. L. Wang; Y. F. Wang; Z. Wang; Z. G. Wang; Z. Y. Wang; D. H. Wei; J. B. Wei; P. Weidenkaff; Q. G. Wen; S. P. Wen; M. Werner; U. Wiedner; L. H. Wu; N. Wu; S. X. Wu; W. Wu; Z. Wu; L. G. Xia; Z. J. Xiao; Y. G. Xie; Q. L. Xiu; G. F. Xu; G. M. Xu; Q. J. Xu; Q. N. Xu; X. P. Xu; Z. R. Xu; F. Xue; Z. Xue; L. Yan; W. B. Yan; Y. H. Yan; H. X. Yang; Y. Yang; Y. X. Yang; H. Ye; M. Ye; M. H. Ye; B. X. Yu; C. X. Yu; H. W. Yu; J. S. Yu; S. P. Yu; C. Z. Yuan; Y. Yuan; A. A. Zafar; A. Zallo; Y. Zeng; B. X. Zhang; B. Y. Zhang; C. Zhang; C. C. Zhang; D. H. Zhang; H. H. Zhang; H. Y. Zhang; J. Q. Zhang; J. W. Zhang; J. Y. Zhang; J. Z. Zhang; R. Zhang; S. H. Zhang; X. J. Zhang; X. Y. Zhang; Y. Zhang; Y. H. Zhang; Z. P. Zhang; Z. Y. Zhang; Zhenghao Zhang; G. Zhao; H. S. Zhao; J. W. Zhao; K. X. Zhao; Lei Zhao; Ling Zhao; M. G. Zhao; Q. Zhao; Q. Z. Zhao; S. J. Zhao; T. C. Zhao; Y. B. Zhao; Z. G. Zhao; A. Zhemchugov; B. Zheng; J. P. Zheng; Y. H. Zheng; B. Zhong; Z. Zhong; L. Zhou; X. K. Zhou; X. R. Zhou; C. Zhu; K. Zhu; K. J. Zhu; S. H. Zhu; X. L. Zhu; Y. C. Zhu; Y. M. Zhu; Y. S. Zhu; Z. A. Zhu; J. Zhuang; B. S. Zou; J. H. Zou

2012-11-24T23:59:59.000Z

247

Photo-production of neutral kaons on 12C in the threshold region  

E-Print Network (OSTI)

Kaon photo-production process on $^{12}$C has been studied by measuring neutral kaons in a photon energy range of 0.8$-$1.1 GeV. Neutral kaons were identified by the invariant mass constructed from two charged pions emitted in the $K^{0}_{S}\\to\\pi^{+}\\pi^{-}$ decay channel. The differential cross sections as well as the integrated ones in the threshold photon energy region were obtained. The obtained momentum spectra were compared with a Spectator model calculation using elementary amplitudes of kaon photo-production given by recent isobar models. Present result provides, for the first time, the information on $n(\\gamma,K^{0})\\Lambda$ reaction which is expected to play an important role to construct models for strangeness production by the electromagnetic interaction. Experimental results show that cross section of $^{12}{\\rm C}(\\gamma,K^0)$ is of the same order to that of $^{12}{\\rm C}(\\gamma,K^+)$ and suggest that slightly backward $K^0$ angular distribution is favored in the $\\gamma n\\to K^0\\Lambda$ process.

T. Watanabe; P. Bydžovský; K. Dobashi; S. Endo; Y. Fujii; O. Hashimoto; T. Ishikawa; K. Itoh; H. Kanda; M. Katoh; T. Kinoshita; O. Konno; K. Maeda; A. Matsumura; F. Miyahara; H. Miyase; T. Miyoshi; K. Mizunuma; Y. Miura; S. N. Nakamura; H. Nomura; Y. Okayasu; T. Osaka; M. Oyamada; A. Sasaki; T. Satoh; H. Shimizu; M. Sotona; T. Takahashi; T. Tamae; H. Tamura; T. Terasawa; H. Tsubota; K. Tsukada; M. Ukai; M. Wakamatsu; H. Yamauchi; H. Yamazaki

2006-07-18T23:59:59.000Z

248

Experimental onset threshold and magnetic pressure pileup for 3D Sweet-Parker reconnection  

SciTech Connect

In space, astrophysical and laboratory plasmas, magnetic reconnect ion converts magnetic into particle energy during unsteady, explosive events. The abrupt onset and cessation has been a long standing puzzle. We show the first three-dimensional (3D) laboratory example of onset and stagnation of Sweet-Parker type magnetic reconnection between magnetized and parallel current (flux) ropes driven by magnetohydrodynamic (MHD) attraction and 3D instability. Mutually attracting flux ropes advect and merge oppositely directed magnetic fields. Magnetic flux is annihilated, but reaches soon a threshold where magnetic flux and pressure pile up, and reconnection magnetic topology appears. This occurs when inflow speeds exceed the SweetParker speed v{sub SP} = v{sub A} / S{sup 1/2}, where v{sub A} is the Alfven speed and S is the Lundquist number for the reconnection layer, as magnetic flux arrives faster than flux annihilation can process it. Finally piled up fields generate MHD reaction forces that stall the inflow and the reconnection process.

Intrator, Thomas P [Los Alamos National Laboratory; Sun, Xuan [Los Alamos National Laboratory; Lapenta, Giovanni [Los Alamos National Laboratory; Furno, Ivo [Los Alamos National Laboratory; [NON LANL

2008-01-01T23:59:59.000Z

249

The linear no-threshold debate: Where do we go from here?  

Science Journals Connector (OSTI)

For the past several years the LNT (linear no-threshold) theory has come under attack within the scientific community. Analysis of a number of epidemiological studies of the Japanese survivors of the atomic bombings and workers exposed to low level radiation suggest that the LNT philosophy is overly conservative and low-level radiation may be less dangerous than commonly believed. Proponents of current standards argue that risk conservatism is justified because low level risks remain uncertain and it is prudent public health policy; LNT opponents maintain that regulatory compliance costs are excessive and there is now substantial scientific information arguing against the LNT model. Regulators use the LNT theory in the standards setting process to predict numbers of cancers due to exposure to low level radiation because direct observations of radiation-induced cancers in populations exposed to low level radiation are difficult. The LNT model is simplistic and provides a conservative estimate of risk. Abandoning the LNT philosophy and relaxing regulations would have enormous economic implications. However alternative models to predict risk at low dose are as difficult to justify as the LNT model. Perhaps exposure limits should be based on model-independent approaches. There is no requirement that exposure limits be based on any predictive model. It is prudent to base exposure limits on what is known directly about health effects of radiation exposure of human populations.

Kenneth L. Mossman

1998-01-01T23:59:59.000Z

250

Binary threshold networks as a natural null model for biological networks  

Science Journals Connector (OSTI)

Spin models of neural networks and genetic networks are considered elegant as they are accessible to statistical mechanics tools for spin glasses and magnetic systems. However, the conventional choice of variables in spin systems may cause problems in some models when parameter choices are unrealistic from a biological perspective. Obviously, this may limit the role of a model as a template model for biological systems. Perhaps less obviously, also ensembles of random networks are affected and may exhibit different critical properties. We consider here a prototypical network model that is biologically plausible in its local mechanisms. We study a discrete dynamical network with two characteristic properties: Nodes with binary states 0 and 1, and a modified threshold function with ?0(0)=0. We explore the critical properties of random networks of such nodes and find a critical connectivity Kc=2.0 with activity vanishing at the critical point. Finally, we observe that the present model allows a more natural implementation of recent models of budding yeast and fission yeast cell-cycle control networks.

Matthias Rybarsch and Stefan Bornholdt

2012-08-27T23:59:59.000Z

251

Measurement of the generalized form factors near threshold via ?*p ? n?+ at high Q2  

SciTech Connect

We report the first extraction of the pion-nucleon multipoles near the production threshold for the n?+ channel at relatively high momentum transfer (Q2 up to 4.2 GeV2). The dominance of the s-wave transverse multipole (E0+), expected in this region, allowed us to access the generalized form factor G1 within the light-cone sum rule (LCSR) framework as well as the axial form factor GA. The data analyzed in this work were collected by the nearly 4? CEBAF Large Acceptance Spectrometer (CLAS) using a 5.754-GeV electron beam on a proton target. The differential cross section and the ?-N multipole E0+/GD were measured using two different methods, the LCSR and a direct multipole fit. The results from the two methods are found to be consistent and almost Q2 independent.

Park, K; Adhikari, K P; Adikaram, D; Anghinolfi, M; Baghdasaryan, H; Ball, J; Battaglieri, M; Batourine, V; Bedlinskiy, I; Bennett, R P; Biselli, A S; Bookwalter, C; Boiarinov, S; Branford, D; Briscoe, W J; Brooks, W K; Burkert, V D; Carman, D S; Celentano, A; Chandavar, S; Charles, G; Cole, P L; Contalbrigo, M; Crede, V; D'Angelo, A; Daniel, A; Dashyan, N; De Vita, R; De Sanctis, E; Deur, A; Djalali, C; Doughty, D; Dupre, R; El Alaoui, A; El Fassi, L; Euginio, P; Fedotov, G; Fradi, A; Gabrielyan, M Y; Gevorgyan, N; Gilfoyle, G P; Giovanetti, K L; Girod, F X; Goetz, J T; Gohn, W; Golovatch, E; Graham, L; Griffioen, K A; Guidal, M; Guo, L; Hafidi, K; Hakobyan, H; Hanretty, C; Heddle, D; Hicks, K; Holtrop, M; Ilieva, Y; Ireland, D G; Ishkhanov, B S; Isupov, E L; Jenkins, D; Jo, H S; Joo, K; Khandaker, M; Khertarpal, P; Kim, A; Kim, W; Klein, F J; Kubarovsky, A; Kubarovsky, V; Kuhn, S E; Kuleshov, S V; Kvaltine, N D; Livingston, K; Lu, H Y; MacGregor, J D; Markov, N; Mayer, M; McKinnon, B; Mestayer, M D; Meyer, C A; Mineeva, T; Mirazita, M; Mokeev, V; Moutarde, H; Munevar, E; Nadel-Turonski, P; Nasseripour, R; Niccolai, S; Niculescu, G; Niculescu, I; Osipenko, M; Ostrovidov, A I; Paolone, M; Pappalardo, L; Paremuzyan, R; Park, S; Anefalos Pereira, S; Phelps, E; Pisano, S; Pogorelko, O; Pozdniakov, S; Price, J W; Procureur, S; Prok, Y; Ricco, G; Rimal, D; Ripani, M; Ritchie, B G; Rosner, G; Rossi, P; Sabati ee, F; Saini, M S; Salgado, C; Schott, D; Schumacher, R A; Seraydaryan, H; Sharabian, Y G; Smith, E S; Smith, G D; Sober, D I; Sokhan, D; Stepanyan, S S; Stepanyan, S; Stoler, P; Strakovsky, I I; Strauch, S; Taiuti, M; Tang, W; Taylor, C E; Tian, Y; Tkachenko, S; Trivedi, A; Ungaro, M; Vernarsky, B; Vlassov, A V; Voutier, E; Watts, D P; Weygand, D P; Wood, M H; Zachariou, N; Zhao, B; Zhao, Z W

2012-03-26T23:59:59.000Z

252

System and method for optically locating microchannel positions  

DOE Patents (OSTI)

A system and method is disclosed for optically locating a microchannel position. A laser source generates a primary laser beam which is directed at a microchannel plate. The microchannel plates include microchannels at various locations. A back-reflectance beam detector receives a back-reflected beam from the plate. The back-reflected beam is generated when the primary beam reflects off of the plate. A photodiode circuit generates a trigger signal when the back-reflected beam exceeds a predetermined threshold, indicating a presence of the microchannel. The method of the present invention includes the steps of generating a primary beam, directing the primary beam to a plate containing a microchannel, receiving from the plate a back-reflected beam generated in response to the primary beam, and generating a trigger signal when the back-reflected beam exceeds a predetermined threshold which corresponds to a presence of the microchannel.

Brewer, Laurence R. (Oakland, CA); Kimbrough, Joseph (Pleasanton, CA); Balch, Joseph (Livermore, CA); Davidson, J. Courtney (Livermore, CA)

2001-01-01T23:59:59.000Z

253

Near-threshold excitation in light rare-earth compounds: A new interpretation of 3 d appearance-potential spectra  

SciTech Connect

A two-step model describing the transitions in electron-excited appearance-potential spectroscopy (APS) is presented for the 3{ital d} thresholds of La and Ce compounds. The model permits a consistent interpretation of APS spectra taken with different modes (soft x-ray APS (SXAPS), Auger-electron APS, disappearance-potential spectroscopy). Within this model an investigation has been performed on La and Ce compounds exhibiting different valencies: LaB{sub 6}, CeB{sub 6}, and CeO{sub 2}. The spectra are discussed in terms of atomiclike 4{ital f} states. The fine structure reflects the multiplet structure of the excited configurations modified by state-selective excitation probabilities near the threshold and---in SXAPS---by dipole selection rules. The interpretation of the APS data is supported by comparison with multiplet calculations and core-level electron-energy-loss spectra recorded at low excitation energy.

Hinkers, H.; Stiller, R.; Merz, H. (Physikalisches Institut der Universitaet Munster, Wilhelm-Klemm-Strasse 10, D-4400 Munster, Federal Republic of Germany (DE))

1989-11-15T23:59:59.000Z

254

Separated cross sections in ?^0 electroproduction at threshold at Q^2 = 0.05 GeV^2/c^2  

E-Print Network (OSTI)

The differential cross sections \\sigma_0=\\sigma_T+\\epsilon \\sigma_L, \\sigma_{LT}, and \\sigma_{TT} of \\pi^0 electroproduction from the proton were measured from threshold up to an additional center of mass energy of 40 MeV, at a value of the photon four-momentum transfer of Q^2= 0.05 GeV^2/c^2 and a center of mass angle of \\theta=90^\\circ. By an additional out-of-plane measurement with polarized electrons \\sigma_{LT'} was determined. This showed for the first time the cusp effect above the \\pi^+ threshold in the imaginary part of the s-wave. The predictions of Heavy Baryon Chiral Perturbation Theory are in disagreement with these data. On the other hand, the data are somewhat better predicted by the MAID phenomenological model and are in good agreement with the dynamical model DMT.

M. Weis; P. Bartsch; D. Baumann; J. Bermuth; A. M. Bernstein; K. Bohinc; R. Böhm; M. Ding; M. O. Distler; I. Ewald; J. M. Friedrich; J. Friedrich; M. Kahrau; M. Kohl; K. W. Krygier; A. Liesenfeld; H. Merkel; P. Merle; U. Müller; R. Neuhausen; M. M. Pavan; Th. Pospischil; M. Potokar; G. Rosner; H. Schmieden; M. Seimetz; S. Širca; A. Wagner; Th. Walcher

2007-05-25T23:59:59.000Z

255

A high-energy, low-threshold tunable intracavity terahertz-wave parametric oscillator with surface-emitted configuration  

Science Journals Connector (OSTI)

A high-energy, low-threshold THz-wave output has been experimentally demonstrated with an intracavity terahertz-wave parametric oscillator based on a surface-emitted configuration, which was pumped by a diode-side-pumped Q-switched Nd:YAG laser. Different beam sizes and repetition rates of the pump light have been investigated for high-energy and high-efficiency THz-wave generation. The maximum THz-wave output energy of 283 nJ/pulse was obtained at 1.54 THz under an intracavity 1064 nm pump energy of 59 mJ. The conversion efficiency was 4.8 ? 10?6, corresponding to a photon conversion efficiency of 0.088%. The pump threshold was 12.9 mJ/pulse. A continuously tunable range from 0.75 to 2.75 THz was realized.

Y Y Wang; D G Xu; H Jiang; K Zhong; J Q Yao

2013-01-01T23:59:59.000Z

256

A 2.6-W Sub-threshold Mixed-signal ECG SoC S. C. Jocke1  

E-Print Network (OSTI)

A 2.6-µW Sub-threshold Mixed-signal ECG SoC S. C. Jocke1 , J. F. Bolus1 , S. N. Wooters1 , A. DC) that acquires and processes an electrocardiogram (ECG) signal for wireless ECG monitoring. The SoC uses a sub the ECG data. The C operates from 0.24 V to 1.2 V and consumes as little as 1.51 pJ per instruction

Calhoun, Benton H.

257

Electron affinity of arsenic and the fine structure of As{sup -} measured using infrared photodetachment threshold spectroscopy  

SciTech Connect

The binding energy and fine-structure splittings of the arsenic negative ion (As{sup -}) have been measured using infrared photodetachment threshold spectroscopy. The relative cross section for neutral atom production was measured with a crossed ion-beam-laser-beam apparatus over selected photon energy ranges between 630-810 meV. An s-wave threshold was observed due to the opening of the As{sup -}(4p{sup 4} {sup 3}P{sub 2}) to As(4p{sup 3} {sup 4}S{sub 3/2}) ground-state to ground-state transition, which yields the electron affinity of As to be 804.8(2) meV. s-wave thresholds were also observed for detachment from the J=1 and J=0 excited levels of As{sup -}, permitting accurate determination of the fine-structure splittings of 127.6(2) meV for {sup 3}P{sub 1}-{sup 3}P{sub 2} and 164.3(10) meV for {sup 3}P{sub 0}-{sup 3}P{sub 2}. The present values are consistent with previous measurements and substantially reduce the uncertainties.

Walter, C. W.; Gibson, N. D.; Field, R. L. III; Snedden, A. P.; Shapiro, J. Z.; Janczak, C. M.; Hanstorp, D. [Department of Physics and Astronomy, Denison University, Granville, Ohio 43023 (United States); Department of Physics, University of Gothenburg, SE-412 96 Gothenburg (Sweden)

2009-07-15T23:59:59.000Z

258

Method and system for controlling a synchronous machine over full operating range  

DOE Patents (OSTI)

System and method for controlling a synchronous machine are provided. The method allows for calculating a stator voltage index. The method further allows for relating the magnitude of the stator voltage index against a threshold voltage value. An offset signal is generated based on the results of the relating step. A respective state of operation of the machine is determined. The offset signal is processed based on the respective state of the machine.

Walters, James E. (Carmel, IN); Gunawan, Fani S. (Westfield, IN); Xue, Yanhong (Westfield, IN)

2002-01-01T23:59:59.000Z

259

A new thresholding algorithm for document images based on the perception of objects by distance  

Science Journals Connector (OSTI)

In this work a new method to enhance and binarize document images with several kind of degradation is proposed. The method is based on the idea that by the absolute difference between a document image and its background it is possible to effectively ... Keywords: Binarization, Document Image Analysis, Document Image Processing, Image Pixel Classification, Visual Perception

R. G. Mesquita; C. A. B. Mello; L. H. E. V. Almeida

2014-04-01T23:59:59.000Z

260

Estimating Methods  

Directives, Delegations, and Requirements

Based on the project's scope, the purpose of the estimate, and the availability of estimating resources, the estimator can choose one or a combination of techniques when estimating an activity or project. Estimating methods, estimating indirect and direct costs, and other estimating considerations are discussed in this chapter.

1997-03-28T23:59:59.000Z

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261

Method to Improve Total Dose Radiation Hardness in a CMOS dc-dc Boost  

E-Print Network (OSTI)

in a wide range of radiation environment, with increasing total dose radiation, The efticieney also greatlyMethod to Improve Total Dose Radiation Hardness in a CMOS dc-dc Boost Converter Huadian Pan to natural radiation in space. Among the effects of ionizing radiation are shiftsin threshold voltageand

Wilamowski, Bogdan Maciej

262

A new cloud and aerosol layer detection method based on micropulse lidar measurements  

E-Print Network (OSTI)

A new cloud and aerosol layer detection method based on micropulse lidar measurements Chuanfeng algorithm to detect aerosols and clouds based on micropulse lidar measurements. A semidiscretization is then introduced. Combined with empirical threshold values, we determine if the signal waves indicate clouds

Li, Zhanqing

263

STATISTICAL METHODS FOR RELATING TEMPERATURE EXTREMES TO LARGE-SCALE METEOROLOGICAL PATTERNS  

E-Print Network (OSTI)

1 STATISTICAL METHODS FOR RELATING TEMPERATURE EXTREMES TO LARGE-SCALE METEOROLOGICAL PATTERNS Rick Extreme Value Analysis: Block Maxima (3) Conditional Extreme Value Analysis: Peaks over Threshold (4) Application to California Temperature Extremes (5) Remaining Work #12;3 #12;4 #12;5 (1) Introduction

Katz, Richard

264

Deeply-bound $K^- pp$ state in the $^3$He(in-flight $K^-$, $n$) spectrum and its moving pole near the $??N$ threshold  

E-Print Network (OSTI)

The formation of a deeply-bound $K^- pp$ state with $I=1/2$, $J^\\pi=0^-$ by the $^3$He(in-flight $K^-$, $n$) reaction is theoretically investigated in a distorted-wave impulse approximation using the Green's function method. The expected inclusive and semi-exclusive spectra at $p_{K^-} = 1.0$ GeV/c and $\\theta_{\\rm lab} = 0^{\\circ}$ are calculated for the forthcoming J-PARC E15 experiment. We demonstrate these spectra with several types of phenomenological $K^-$-``$pp$'' optical potentials $U^{\\rm opt}(E)$ which have an energy-dependent imaginary part multiplied by a phase space suppression factor, fitting to recent theoretical predictions or experimental candidates of the $K^-pp$ bound state. The results show that a cusp-like peak at the $\\pi \\Sigma N$ threshold is an unique signal for the $K^-pp$ bound state in the spectrum including the [$K^-pp$] $\\to$ $Y + N$ decay process from the two-nucleon $K^-$ absorption, as well as a distinct peak of the $K^-pp$ bound state. The shape of the spectrum is explained by a trajectory of a moving pole of the $K^-pp$ bound state in the complex energy plane. The importance of the spectrum with [$K^-pp$] $\\to$ $Y + N$ from the two-nucleon $K^-$ absorption is emphasized in order to extract clear evidence of the $K^-pp$ bound state.

T. Koike; T. Harada

2009-11-06T23:59:59.000Z

265

Method and system for managing an electrical output of a turbogenerator  

DOE Patents (OSTI)

The system and method manages an electrical output of a turbogenerator in accordance with multiple modes. In a first mode, a direct current (DC) bus receives power from a turbogenerator output via a rectifier where turbogenerator revolutions per unit time (e.g., revolutions per minute (RPM)) or an electrical output level of a turbogenerator output meet or exceed a minimum threshold. In a second mode, if the turbogenerator revolutions per unit time or electrical output level of a turbogenerator output are less than the minimum threshold, the electric drive motor or a generator mechanically powered by the engine provides electrical energy to the direct current bus.

Stahlhut, Ronnie Dean (Bettendorf, IA); Vuk, Carl Thomas (Denver, IA)

2010-08-24T23:59:59.000Z

266

The dE/dx method and its implementation on the search for the lambdab baryon  

E-Print Network (OSTI)

) Teruki K amon (Member) Richard Arnowitt (Head of Department) May 1993 ABSTRACT The dE/dx Method and Its Implementation on the Search for the Ab Baryon. (May 1993) Michael Kokkoris, B. S. , University of Athens Chair of Advisory Committee: Dr.... . dE Figure 35. Plot of o' versus total momentum for pion. 58 59 60 61 62 Figure 36. Plot of the invariant mass of A for low psa, threshold of 0. 3 GeV/c. Figure 37. Plot of the invariant mass of A for low ps r threshold of 0. 2 GeV/c. 64...

Kokkoris, Michael

2012-06-07T23:59:59.000Z

267

Infrared emitting device and method  

DOE Patents (OSTI)

An infrared emitting device and method. The infrared emitting device comprises a III-V compound semiconductor substrate upon which are grown a quantum-well active region having a plurality of quantum-well layers formed of a ternary alloy comprising InAsSb sandwiched between barrier layers formed of a ternary alloy having a smaller lattice constant and a larger energy bandgap than the quantum-well layers. The quantum-well layers are preferably compressively strained to increase the threshold energy for Auger recombination; and a method is provided for determining the preferred thickness for the quantum-well layers. Embodiments of the present invention are described having at least one cladding layer to increase the optical and carrier confinement in the active region, and to provide for waveguiding of the light generated within the active region. Examples have been set forth showing embodiments of the present invention as surface- and edge-emitting light emitting diodes (LEDs), an optically-pumped semiconductor laser, and an electrically-injected semiconductor diode laser. The light emission from each of the infrared emitting devices of the present invention is in the midwave infrared region of the spectrum from about 2 to 6 microns.

Kurtz, Steven R. (Albuquerque, NM); Biefeld, Robert M. (Albuquerque, NM); Dawson, L. Ralph (Albuquerque, NM); Howard, Arnold J. (Albuquerque, NM); Baucom, Kevin C. (Albuquerque, NM)

1997-01-01T23:59:59.000Z

268

Effects of pion potential and nuclear symmetry energy on the $\\pi^{-}/\\pi^{+}$ ratio in heavy-ion collisions at beam energies around the pion production threshold  

E-Print Network (OSTI)

Within the framework of an isospin-dependent Boltzmann-Uehling-Uhlenbeck(IBUU) transport model, we studied the effects of the pion potential and the symmetry energy on the pion production in the central $^{197}Au+^{197}Au$ collisions around the pion production threshold. It is found that the pion potential affects the value of $\\pi^-/\\pi^+$ ratio around the Coulomb peak and also in the high energy region of pion mesons. The effect of the pion potential on the $\\pi^-/\\pi^+$ ratio becomes large in heavy-ion collisions at beam energies below the pion production threshold. And at beam energies below the pion production threshold, with the pion potential, the effect of the symmetry energy on the $\\pi^-/\\pi^+$ ratio becomes quite small compared with that above the pion production threshold.

Guo, Wen-Mei; Liu, Hang; Zuo, Wei

2014-01-01T23:59:59.000Z

269

Spontaneous Recovery in Acute Human Hepatitis C Virus Infection: Functional T-Cell Thresholds and Relative Importance of CD4 Help  

Science Journals Connector (OSTI)

...IMMUNITY Spontaneous Recovery in Acute Human...Sciences Center and National Jewish Hospital...established a large national network of patients...thresholds that predict recovery. Interestingly...appropriate institutional review boards. Acute HCV was...

Susan Smyk-Pearson; Ian A. Tester; Jared Klarquist; Brent E. Palmer; Jean-Michel Pawlotsky; Lucy Golden-Mason; Hugo R. Rosen

2007-11-28T23:59:59.000Z

270

Damage Mechanisms In Polymers Upon NIR Femtosecond Pulse Laser Irradiation: Sub-Threshold Processes And Their Implications For Laser Safety Applications  

SciTech Connect

This contribution investigates laser-induced damage of thin film and bulk polymer samples, with the focus on physical processes occurring close to the damage threshold. In-situ real-time reflectivity (RTR) measurements with picosecond (ps) and nanosecond (ns) temporal resolution were performed on thin polymer films on a timescale up to a few microseconds ({mu}s). A model for polymer thin film damage is presented, indicating that irreversible chemical modification processes take place already below the fluence threshold for macroscopic damage. On dye-doped bulk polymer filters (as used for laser goggles), transmission studies using fs-and ps-laser pulses reveal the optical saturation behavior of the material and its relation to the threshold of permanent damage. Implications of the sub-threshold processes for laser safety applications will be discussed for thin film and bulk polymer damage.

Bonse, Joern; Krueger, Joerg [BAM Bundesanstalt fuer Materialforschung und -pruefung, Unter den Eichen 87, D-12205 Berlin (Germany); Solis, Javier [Laser Processing Group, Instituto de Optica, CSIC, Serrano 121, E-28006 Madrid (Spain); Spielmann, Christian [Friedrich-Schiller-Universitaet Jena, Max-Wien-Platz 1, D-07743 Jena (Germany); Lippert, Thomas [Paul Scherrer Institut, CH-5232 Villigen (Switzerland)

2010-10-08T23:59:59.000Z

271

Method and apparatus for monitoring a hydrocarbon-selective catalytic reduction device  

DOE Patents (OSTI)

A method for monitoring a hydrocarbon-selective catalytic reactor device of an exhaust aftertreatment system of an internal combustion engine operating lean of stoichiometry includes injecting a reductant into an exhaust gas feedstream upstream of the hydrocarbon-selective catalytic reactor device at a predetermined mass flowrate of the reductant, and determining a space velocity associated with a predetermined forward portion of the hydrocarbon-selective catalytic reactor device. When the space velocity exceeds a predetermined threshold space velocity, a temperature differential across the predetermined forward portion of the hydrocarbon-selective catalytic reactor device is determined, and a threshold temperature as a function of the space velocity and the mass flowrate of the reductant is determined. If the temperature differential across the predetermined forward portion of the hydrocarbon-selective catalytic reactor device is below the threshold temperature, operation of the engine is controlled to regenerate the hydrocarbon-selective catalytic reactor device.

Schmieg, Steven J; Viola, Michael B; Cheng, Shi-Wai S; Mulawa, Patricia A; Hilden, David L; Sloane, Thompson M; Lee, Jong H

2014-05-06T23:59:59.000Z

272

Method to reduce damage to backing plate  

DOE Patents (OSTI)

The present invention is a method for penetrating a workpiece using an ultra-short pulse laser beam without causing damage to subsequent surfaces facing the laser. Several embodiments are shown which place holes in fuel injectors without damaging the back surface of the sack in which the fuel is ejected. In one embodiment, pulses from an ultra short pulse laser remove about 10 nm to 1000 nm of material per pulse. In one embodiment, a plasma source is attached to the fuel injector and initiated by common methods such as microwave energy. In another embodiment of the invention, the sack void is filled with a solid. In one other embodiment, a high viscosity liquid is placed within the sack. In general, high-viscosity liquids preferably used in this invention should have a high damage threshold and have a diffusing property.

Perry, Michael D. (Livermore, CA); Banks, Paul S. (Livermore, CA); Stuart, Brent C. (Fremont, CA)

2001-01-01T23:59:59.000Z

273

Optimal threshold probability in undiscounted Markov decision processes with a target set  

Science Journals Connector (OSTI)

We consider risk minimizing problems in undiscounted Markov decisions processes with a target set. We formulate the problem as an infinite horizon case with a recurrent class. We show that an optimal value function is a unique solution to an optimality ... Keywords: Existence of optimal policy, Markov decision process, Minimizing risk model, Policy improvement method, Value iteration

Yoshio Ohtsubo

2004-02-01T23:59:59.000Z

274

Casting methods  

DOE Patents (OSTI)

A casting device includes a covered crucible having a top opening and a bottom orifice, a lid covering the top opening, a stopper rod sealing the bottom orifice, and a reusable mold having at least one chamber, a top end of the chamber being open to and positioned below the bottom orifice and a vacuum tap into the chamber being below the top end of the chamber. A casting method includes charging a crucible with a solid material and covering the crucible, heating the crucible, melting the material, evacuating a chamber of a mold to less than 1 atm absolute through a vacuum tap into the chamber, draining the melted material into the evacuated chamber, solidifying the material in the chamber, and removing the solidified material from the chamber without damaging the chamber.

Marsden, Kenneth C.; Meyer, Mitchell K.; Grover, Blair K.; Fielding, Randall S.; Wolfensberger, Billy W.

2012-12-18T23:59:59.000Z

275

A precision measurement of the $p$($e,e^\\prime p\\,$)$\\pi^0$ reaction at threshold  

E-Print Network (OSTI)

New results are reported from an experiment to measure $\\pi^0$ electroproduction at and above threshold using the $p(e,e^{\\prime} p)\\pi^0$ reaction. The experiment was designed to precisely determine the energy dependence of $s-$ and $p-$wave electromagnetic multipoles as a stringent test of the predictions of Chiral Perturbation Theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the $\\phi^*_{\\pi}$ and $\\theta^*_{\\pi}$ angles in the $p \\pi^0$ center-of-mass was obtained for invariant energies above threshold from 0.5~MeV up to 15~MeV. The 4-momentum transfer $Q^2$ coverage ranges from 0.05 to 0.155 (GeV/c)$^2$ in fine steps. A simple phenomenological analysis of our data shows strong disagreement with $p-$wave predictions from ChPT for $Q^2>0.07$ (GeV/c)$^2$, while the $s-$wave predictions are in reasonable agreement.

Chirapatpimol, K; Lindgren, R A; Smith, L C; Annand, J R M; Higinbotham, D W; Moffit, B; Nelyubin, V; Norum, B E; Allada, K; Aniol, K; Ardashev, K; Armstrong, D S; Arndt, R A; Benmokhtar, F; Bernstein, A M; Bertozzi, W; Briscoe, W J; Bimbot, L; Camsonne, A; Chen, J -P; Choi, S; Chudakov, E; Cisbani, E; Cusanno, F; Dalton, M M; Dutta, C; Egiyan, K; Fernandez-Ramirez, C; Feuerbach, R; Fissum, K G; Frullani, S; Garibaldi, F; Gayou, O; Gilman, R; Gilad, S; Goity, J; Gomez, J; Hahn, B; Hamilton, D; Hansen, J -O; Huang, J; Igarashi, R; Ireland, D; de Jager, C W; Jin, X; Jiang, X; Jinasundera, T; Kellie, J; Keppel, C E; Kolb, N; LeRose, J; Liyanage, N; Livingston, K; McNulty, D; Mercado, L; Michaels, R; Mihovilovic, M; Qian, S; Qian, X; Mailyan, S; Mamyan, V; Marrone, S; Monaghan, P; Nanda, S; Perdrisat, C F; Piasetzky, E; Protopopescu, D; Punjabi, V; Qiang, Y; Rachek, I A; Rakhman, A; Ron, G; Rosner, G; Saha, A; Sawatzky, B; Shahinyan, A; Sirca, S; Sparveris, N; Subedi, R R; Suleiman, R; Strakovsky, I; Sulkosky, V; Moinelo, J; Voskanyan, H; Wang, K; Wang, Y; Watson, J; Watts, D; Wojtsekhowski, B; Workman, R L; Yao, H; Zhan, X; Zhang, Y

2015-01-01T23:59:59.000Z

276

Comparison of detection threshold measurements and modeling for approaching electric cars and conventional cars presented in traffic and pink noise  

Science Journals Connector (OSTI)

This study investigates the difference in audibility of an approaching conventional car with internal combustion engine and an electric car at various velocities. The goal was to compare the risk that pedestrians do not hear the approaching car in time. Binaural recordings of each of these approaching cars were presented together with either a traffic noise masker or a pink noise masker. In the first detection experiment the threshold level was determined for which the cars could just be detected. In a second reaction time experiment the moment was determined at which the approaching car was first detectable. This measured reaction time should give an indication about how much time a person has to evade an impending collision. Results indicated that slowly approaching electric cars where less audible than cars with a conventional engine. The results also showed that the decrement of reaction times as a function of SNR was halved when pink noise was used instead of traffic noise. A psycho-acoustic masking model [Dau et al. J. Acoust. Soc. Am. 99 3615–3622 (1996)] was applied to predict detection thresholds and showed good correspondence with the subjective data.

2013-01-01T23:59:59.000Z

277

Comparison of detection threshold measurements and modeling for approaching electric cars and conventional cars presented in traffic and pink noise  

Science Journals Connector (OSTI)

This study investigates the difference in audibility of an approaching conventional car with internal combustion engine and an electric car at various velocities. The goal was to compare the risk that pedestrians do not hear the approaching car in time. Binaural recordings of each of these approaching cars were presented together with either a traffic noise masker or a pink noise masker. In the first detection experiment the threshold level was determined for which the cars could just be detected. In a second reaction time experiment the moment was determined at which the approaching car was first detectable. This measured reaction time should give an indication about how much time a person has to evade an impending collision. Results indicated that slowly approaching electric cars where less audible than cars with a conventional engine. The results also showed that the decrement of reaction times as a function of SNR was halved when pink noise was used instead of traffic noise. A psycho-acoustic masking model [Dau et. al. (1996) J. Acoust. Soc. Am. 99 3615 - 3622] was applied to predict detection thresholds and showed good correspondence with the subjective data.

Julian Grosse; Reinhard Weber; Steven Van de Par

2013-01-01T23:59:59.000Z

278

Lowering the background level and the energy threshold of Micromegas x-ray detectors for axion searches  

E-Print Network (OSTI)

Axion helioscopes search for solar axions by their conversion in x-rays in the presence of high magnetic fields. The use of low background x-ray detectors is an essential component contributing to the sensitivity of these searches. In this work, we review the recent advances on Micromegas detectors used in the CERN Axion Solar Telescope (CAST) and proposed for the future International Axion Observatory (IAXO). The actual setup in CAST has achieved background levels below 10$^{-6}$ keV$^{-1}$ cm$^{-2}$ s$^{-1}$, a factor 100 lower than the first generation of Micromegas detectors. This reduction is based on active and passive shielding techniques, the selection of radiopure materials, offline discrimination techniques and the high granularity of the readout. We describe in detail the background model of the detector, based on its operation at CAST site and at the Canfranc Underground Laboratory (LSC), as well as on Geant4 simulations. The best levels currently achieved at LSC are low than 10$^{-7}$ keV$^{-1}$ cm$^{-2}$ s$^{-1}$ and show good prospects for the application of this technology in IAXO. Finally, we present some ideas and results for reducing the energy threshold of these detectors below 1 keV, using high-transparent windows, autotrigger electronics and studying the cluster shape at different energies. As a high flux of axion-like-particles is expected in this energy range, a sub-keV threshold detector could enlarge the physics case of axion helioscopes.

F. J. Iguaz; S. Aune; F. Aznar; J. F. Castel; T. Dafni; M. Davenport; E. Ferrer-Ribas; J. Galan; J. A. Garcia; J. G. Garza; I. Giomataris; I. G. Irastorza; T. Papaevangelou; A. Rodriguez; A. Tomas; T. Vafeiadis; S. C. Yildiz

2015-01-07T23:59:59.000Z

279

Infrared emitting device and method  

DOE Patents (OSTI)

The infrared emitting device comprises a III-V compound semiconductor substrate upon which are grown a quantum-well active region having a plurality of quantum-well layers formed of a ternary alloy comprising InAsSb sandwiched between barrier layers formed of a ternary alloy having a smaller lattice constant and a larger energy bandgap than the quantum-well layers. The quantum-well layers are preferably compressively strained to increase the threshold energy for Auger recombination; and a method is provided for determining the preferred thickness for the quantum-well layers. Embodiments of the present invention are described having at least one cladding layer to increase the optical and carrier confinement in the active region, and to provide for waveguiding of the light generated within the active region. Examples have been set forth showing embodiments of the present invention as surface- and edge-emitting light emitting diodes (LEDs), an optically-pumped semiconductor laser, and an electrically-injected semiconductor diode laser. The light emission from each of the infrared emitting devices of the present invention is in the midwave infrared region of the spectrum from about 2 to 6 microns. 8 figs.

Kurtz, S.R.; Biefeld, R.M.; Dawson, L.R.; Howard, A.J.; Baucom, K.C.

1997-04-29T23:59:59.000Z

280

Role of relative humidity in concrete expansion due to alkali-silica reaction and delayed ettringite formation: relative humidity thresholds, measurement methods, and coatings to mitigate expansion.  

E-Print Network (OSTI)

??Premature concrete deterioration due to alkali-silica reaction (ASR) and delayed ettringite formation (DEF) is a significant problem all over the world. In cases where these… (more)

Rust, Charles Karissa

2009-01-01T23:59:59.000Z

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281

Motor cortex activation by H-coil and figure-8 coil at different depths. Combined motor threshold and electric field distribution study  

Science Journals Connector (OSTI)

AbstractObjective To compare the ability of an H-coil and figure-8 coil to stimulate different motor cortex regions. Methods The resting (rMT) and active (aMT) motor thresholds were measured for the right hand APB and leg AHB muscles in 10 subjects, using an H-coil and a figure-8 coil. The electric field distribution induced by the coils was measured in a head model. The combination of the hand and leg \\{MTs\\} with the field measurements was used to determine the depth of hand and leg motor areas via the intersection points. Results The rMT and aMT of both APB and AHB were significantly lower for the H-coil. The ratio and difference between the leg and hand rMT and aMT were significantly lower for the H-Coil. Electric field measurements revealed significantly more favorable depth profile and larger volume of stimulation for the H-coil. The averaged intersection for the APB was at a distance from coil of 1.83 ± 0.54 cm and at an intensity of 97.8 ± 21.4 V/m, while for the AHB it was at a distance of 2.73 ± 0.44 cm and at an intensity of 118.6 ± 21.3 V/m. Conclusion The results suggest a more efficient activation of deeper motor cortical regions using the H-coil. Significance The combined evaluation of \\{MTs\\} by H- and figure-8 coils allows measurement of the individual depth of different motor cortex regions. This could be helpful for optimizing stimulation parameters for TMS treatment.

Yiftach Roth; Gaby S. Pell; Andrei V. Chistyakov; Alon Sinai; Abraham Zangen; Menashe Zaaroor

2014-01-01T23:59:59.000Z

282

Universal squash model for optical communications using linear optics and threshold detectors  

SciTech Connect

Transmission of photons through open-air or optical fibers is an important primitive in quantum-information processing. Theoretical descriptions of this process often consider single photons as information carriers and thus fail to accurately describe experimental implementations where any number of photons may enter a detector. It has been a great challenge to bridge this big gap between theory and experiments. One powerful method for achieving this goal is by conceptually squashing the received multiphoton states to single-photon states. However, until now, only a few protocols admit a squash model; furthermore, a recently proven no-go theorem appears to rule out the existence of a universal squash model. Here we show that a necessary condition presumed by all existing squash models is in fact too stringent. By relaxing this condition, we find that, rather surprisingly, a universal squash model actually exists for many protocols, including quantum key distribution, quantum state tomography, Bell's inequality testing, and entanglement verification.

Fung, Chi-Hang Fred; Chau, H. F. [Department of Physics and Center of Computational and Theoretical Physics, University of Hong Kong, Pokfulam Road (Hong Kong); Lo, Hoi-Kwong [Center for Quantum Information and Quantum Control, Department of Physics and Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4 (Canada)

2011-08-15T23:59:59.000Z

283

Threshold Photoelectron Photoion Coincidence (TPEPICO) Studies: The Road to ? 0.1 kJ/mol Thermochemistry  

SciTech Connect

The threshold photoelectron photoion coincidence (TPEPICO) technique is utilized to investigate the dissociation dynamics and thermochemistry of energy selected medium to large organic molecular ions. The reactions include parallel and consecutive steps that are modeled with the statistical theory in order to extract dissociation onsets for multiple dissociation paths. These studies are carried out with the aid of molecular orbital calculations of both ions and the transition states connecting the ion structure to their products. The results of these investigations yield accurate heats of formation of ions, free radicals, and stable molecules. In addition, they provide information about the potential energy surface that governs the dissociation process. Isomerization reactions prior to dissociation are readily inferred from the TPEPICO data.

Baer, Tomas [University of North Carolina

2013-10-14T23:59:59.000Z

284

Observation of a backward peak in the gamma d ---> pi0 d cross- section near the eta threshold  

SciTech Connect

High-quality cross sections for the reaction gamma+d->pi^0+d have been measured using the CLAS at Jefferson Lab over a wide energy range near and above the eta-meson photoproduction threshold. At backward c.m. angles for the outgoing pions, we observe a resonance-like structure near E_gamma=700 MeV. Our model analysis shows that it can be explained by eta excitation in the intermediate state. The effect is the result of the contribution of the N(1535)S_11 resonance to the amplitudes of the subprocesses occurring between the two nucleons and of a two-step process in which the excitation of an intermediate eta meson dominates.

Yordanka Ilieva; Barry Berman; Alexander Kudryavtsev; I.I. Strakovsky; V.E. Tarasov; Moscov Amaryan; Pawel Ambrozewicz; Marco Anghinolfi; G. Asryan; Harutyun Avakian; Hovhannes Baghdasaryan; Nathan Baillie; Jacques Ball; Nathan Baltzell; V. Batourine; Marco Battaglieri; Ivan Bedlinski; Ivan Bedlinskiy; Matthew Bellis; Nawal Benmouna; Angela Biselli; Sylvain Bouchigny; Sergey Boyarinov; Robert Bradford; Derek Branford; William Briscoe; William Brooks; Stephen Bueltmann; Volker Burkert; Cornel Butuceanu; John Calarco; Sharon Careccia; Daniel Carman; Shifeng Chen; Philip Cole; Patrick Collins; Philip Coltharp; Donald Crabb; Volker Crede; R. De Masi; Enzo De Sanctis; Raffaella De Vita; Pavel Degtiarenko; Alexandre Deur; Richard Dickson; Chaden Djalali; Gail Dodge; Joseph Donnelly; David Doughty; Michael Dugger; Oleksandr Dzyubak; Hovanes Egiyan; Kim Egiyan; Latifa Elouadrhiri; Paul Eugenio; Gleb Fedotov; Gerald Feldman; Herbert Funsten; Michel Garcon; Gagik Gavalian; Gerard Gilfoyle; Kevin Giovanetti; Francois-Xavier Girod; John Goetz; Atilla Gonenc; Ralf Gothe; Keith Griffioen; Michel Guidal; Nevzat Guler; Lei Guo; Vardan Gyurjyan; Kawtar Hafidi; Rafael Hakobyan; F. Hersman; Kenneth Hicks; Ishaq Hleiqawi; Maurik Holtrop; Charles Hyde; Charles Hyde-Wright; David Ireland; Boris Ishkhanov; Eugeny Isupov; Mark Ito; David Jenkins; Hyon-Suk Jo; Kyungseon Joo; Henry Juengst; Narbe Kalantarians; James Kellie; Mahbubul Khandaker; Wooyoung Kim; Andreas Klein; Franz Klein; Mikhail Kossov; Zebulun Krahn; Laird Kramer; V. Kubarovsky; Joachim Kuhn; Sebastian Kuhn; Sergey Kuleshov; Jeff Lachniet; Jean Laget; Jorn Langheinrich; David Lawrence; Kenneth Livingston; Haiyun Lu; Marion MacCormick; Nikolai Markov; Bryan McKinnon; Bernhard Mecking; Mac Mestayer; Curtis Meyer; Tsutomu Mibe; Konstantin Mikhaylov; Marco Mirazita; Rory Miskimen; Viktor Mokeev; Kei Moriya; Steven Morrow; M. Moteabbed; E. Munevar; Gordon Mutchler; Pawel Nadel-Turonski; Rakhsha Nasseripour; Silvia Niccolai; Gabriel Niculescu; Maria-Ioana Niculescu; Bogdan Niczyporuk; Megh Niroula; Rustam Niyazov; Mina Nozar; Mikhail Osipenko; Alexander Ostrovidov; K. Park; Evgueni Pasyuk; Craig Paterson; Joshua Pierce; Nikolay Pivnyuk; Oleg Pogorelko; S. Pozdniakov; John Price; Yelena Prok; Dan Protopopescu; Brian Raue; Giovanni Ricco; Marco Ripani; Barry Ritchie; Federico Ronchetti; Guenther Rosner; Patrizia Rossi; Franck Sabatie; Carlos Salgado; Joseph Santoro; Vladimir Sapunenko; Reinhard Schumacher; Vladimir Serov; Youri Sharabian; Nikolay Shvedunov; Elton Smith; Lee Smith; Daniel Sober; Aleksey Stavinskiy; Samuel Stepanyan; Stepan Stepanyan; Burnham Stokes; Paul Stoler; Steffen Strauch; Mauro Taiuti; David Tedeschi; Ulrike Thoma; Avtandil Tkabladze; Svyatoslav Tkachenko; Clarisse Tur; Maurizio Ungaro; Michael Vineyard; Alexander Vlassov; Lawrence Weinstein; Dennis Weygand; M. Williams; Elliott Wolin; Michael Wood; Amrit Yegneswaran; Lorenzo Zana; Jixie Zhang; Bo Zhao; Zhiwen Zhao

2007-05-14T23:59:59.000Z

285

Low-threshold up-conversion luminescence in ZnxCd1?xS with oxidized surface  

Science Journals Connector (OSTI)

The process of low-threshold up-conversion luminescence in ZnxCd1?xS crystals of solid solutions (where x=0.5–0.9) with oxidized surface has been studied. It has been proved that the centers of excitation of up-conversion luminescence form from (CdO)n and (ZnO)n clusters adsorbed on the surface of ZnxCd1?xS crystals. It has been experimentally proved that up-conversion luminescence is connected with the formation of quantum wells. The excitation of such luminescence appears under the influence of quanta 1.7–2.0 eV with the density 0.005 W/cm2, as a result of cold Auger process.

Mikhail S. Smirnov; Oleg V. Ovchinnikov; Ekaterina A. Kosyakova; Anatoly N. Latyshev; Alexander F. Klinskikh; Elena P. Tat’yanina; Pavel V. Novikov; Mien Hai

2009-01-01T23:59:59.000Z

286

Consistent threshold pi0 electro-production at Q^2=0.05, 0.10, and 0.15 GeV^2/c^2  

E-Print Network (OSTI)

New, accurate data are presented on the near threshold p(e,e'p)pi^0 reaction in the range of four-momentum transfers between Q^2=0.05 and 0.15GeV^2/c^2. The data were taken with the spectrometer setup of the A1 Collaboration at the Mainz Microtron MAMI. The complete center of mass solid angle was covered up to a center of mass energy of 4MeV above threshold. These results supersede the previous analysis based on three separate experiments, and are compared with calculations in Heavy Baryon Chiral Perturbation Theory and with phenomenological models.

H. Merkel; P. Achenbach; C. Ayerbe Gayoso; M. Ases Antelo; D. Baumann; A. M. Bernstein; R. Böhm; D. Bosnar; M. Ding; M. O. Distler; L. Doria; J. Garcia Llongo; D. W. Higinbotham; G. Jover Mañas; M. Makek; U. Müller; R. Neuhausen; L. Nungesser; R. Pérez Benito; J. Pochodzalla; M. Seimetz; S. Sirca; S. Stave; Th. Walcher; M. Weis

2011-09-23T23:59:59.000Z

287

Method and apparatus for welding precipitation hardenable materials  

DOE Patents (OSTI)

A method for welding together members consisting of precipitation age hardened materials includes the steps of selecting a weld filler material that has substantially the same composition as the materials being joined, and an age hardening characteristic temperature age threshold below that of the aging kinetic temperature range of the materials being joined, whereby after welding the members together, the resulting weld and heat affected zone (HAZ) are heat treated at a temperature below that of the kinetic temperature range of the materials joined, for obtaining substantially the same mechanical characteristics for the weld and HAZ, as for the parent material of the members joined. 5 figures.

Murray, H. Jr.; Harris, I.D.; Ratka, J.O.; Spiegelberg, W.D.

1994-06-28T23:59:59.000Z

288

Optical domain analog to digital conversion methods and apparatus  

DOE Patents (OSTI)

Methods and apparatus for optical analog to digital conversion are disclosed. An optical signal is converted by mapping the optical analog signal onto a wavelength modulated optical beam, passing the mapped beam through interferometers to generate analog bit representation signals, and converting the analog bit representation signals into an optical digital signal. A photodiode receives an optical analog signal, a wavelength modulated laser coupled to the photodiode maps the optical analog signal to a wavelength modulated optical beam, interferometers produce an analog bit representation signal from the mapped wavelength modulated optical beam, and sample and threshold circuits corresponding to the interferometers produce a digital bit signal from the analog bit representation signal.

Vawter, Gregory A

2014-05-13T23:59:59.000Z

289

Method and apparatus for welding precipitation hardenable materials  

DOE Patents (OSTI)

A method for welding together members consisting of precipitation age hardened materials includes the steps of selecting a weld filler material that has substantially the same composition as the materials being joined, and an age hardening characteristic temperature age threshold below that of the aging kinetic temperature range of the materials being joined, whereby after welding the members together, the resulting weld and heat affected zone (HAZ) are heat treated at a temperature below that of the kinetic temperature range of the materials joined, for obtaining substantially the same mechanical characteristics for the weld and HAZ, as for the parent material of the members joined.

Murray, Jr., Holt (Hopewell, NJ); Harris, Ian D. (Dublin, OH); Ratka, John O. (Cleveland Heights, OH); Spiegelberg, William D. (Parma, OH)

1994-01-01T23:59:59.000Z

290

Optical Nonlinearity in Ar and N2 near the Ionization Threshold J. K. Wahlstrand, Y.-H. Cheng, Y.-H. Chen, and H. M. Milchberg  

E-Print Network (OSTI)

Optical Nonlinearity in Ar and N2 near the Ionization Threshold J. K. Wahlstrand, Y.-H. Cheng, Y measure the nonlinear optical response in argon and nitrogen in a thin gas target to laser intensities.103901 PACS numbers: 42.65.An, 42.65.Jx, 42.65.Re The optical Kerr effect, the intensity-dependent refrac

Milchberg, Howard

291

Increasing the laser-induced damage threshold of single-crystal ZnGeP{sub 2}  

SciTech Connect

The laser-induced damage threshold (LIDT) of single-crystal zinc germanium phosphide (ZGP), ZnGeP{sub 2}, was increased to 2 J/cm{sup 2} at 2.05 {mu}m and a 10 kHz pulse rate frequency (double the previously measured value of 1 J/cm{sup 2}). This increased LIDT was achieved by improving the polishing of ZGP optical parametric oscillator crystals. Two different polishing techniques were evaluated. Surfaces were characterized using scanning white-light interferometry to determine rms surface roughness and sample flatness. The photon backscatter technique was used to determine the degree of surface and subsurface damage in the sample induced through the fabrication process. The effect of subsurface damage in the samples was studied by removing different amounts of material during polishing for otherwise identical samples. Statistical LIDT was measured using a high-average-power, repetitively Q-switched Tm,Ho:YLF 2.05 {mu}m pump laser. On average, lower surface roughness and photon backscatter measurements were a good indicator of ZGP samples exhibiting higher LIDT. The removal of more material during polishing significantly improved the LIDT of otherwise identical samples, indicating the importance of subsurface damage defects in the LIDT of ZGP.

Zawilski, Kevin T.; Setzler, Scott D.; Schunemann, Peter G.; Pollak, Thomas M. [BAE Systems, Advanced Systems and Technology, P.O. Box 868, MER15-1813, Nashua, New Hampshire 03061-0868 (United States)

2006-11-15T23:59:59.000Z

292

A semi-analytic power balance model for low (L) to high (H) mode transition power threshold  

SciTech Connect

We present a semi-analytic model for low (L) to high (H) mode transition power threshold (P{sub th}). Two main assumptions are made in our study. First, high poloidal mode number drift resistive ballooning modes (high-m DRBM) are assumed to be the dominant turbulence driver in a narrow edge region near to last closed flux surface. Second, the pre-transition edge profile and turbulent diffusivity at the narrow edge region pertain to turbulent equipartition. An edge power balance relation is derived by calculating the dissipated power flux through both turbulent conduction and convection, and radiation in the edge region. P{sub th} is obtained by imposing the turbulence quench rule due to sheared E?×?B rotation. Evaluation of P{sub th} shows a good agreement with experimental results in existing machines. Increase of P{sub th} at low density (i.e., the existence of roll-over density in P{sub th} vs. density) is shown to originate from the longer scale length of the density profile than that of the temperature profile.

Singh, R., E-mail: rsingh129@yahoo.co.in [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); Institute for Plasma Research, Bhat Gandhinagar 2382 428 (India); Jhang, Hogun [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); Kaw, P. K. [Institute for Plasma Research, Bhat Gandhinagar 2382 428 (India); Diamond, P. H. [WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); Center for Momentum Transport and Flow Organization, University of California, San Diego, California 92093 (United States); Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Dr., La Jolla, California 92093-0424 (United States); Nordman, H. [Department of Earth and Space Sciences, Chalmers University of Technology, SE-412 96 Göteborg (Sweden); Bourdelle, C. [Euratom-CEA Association, CEA/DSM/DRFC, CEA Cadarache F-13108 Saint-Paul-Lez-Durance (France); Loarte, A. [ITER Organization, Route de Vinon Sur Verdon, A. 13115 Saint Paul Lez Durance (France)

2014-06-15T23:59:59.000Z

293

Thickness effect on laser-induced-damage threshold of indium-tin oxide films at 1064 nm  

SciTech Connect

Laser-induced-damage characteristics of commercial indium-tin oxide (ITO) films deposited by DC magnetron sputtering deposition on K9 glass substrates as a function of the film thickness have been studied at 1064 nm with a 10 ns laser pulse in the 1-on-1 mode, and the various mechanisms for thickness effect on laser-induced-damage threshold (LIDT) of the film have been discussed in detail. It is observed that laser-damage-resistance of ITO film shows dramatic thickness effect with the LIDT of the 50-nm ITO film 7.6 times as large as the value of 300 nm film, and the effect of depressed carrier density by decreasing the film thickness is demonstrated to be the primary reason. Our experiment findings indicate that searching transparent conductive oxide (TCO) film with low carrier density and high carrier mobility is an efficient technique to improve the laser-damage-resistance of TCO films based on maintaining their well electric conductivity.

Wang Haifeng; Huang Zhimeng; Zhang Dayong; Luo Fei; Huang Lixian; Li Yanglong; Luo Yongquan; Wang Weiping; Zhao Xiangjie [Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900 (China)

2011-12-01T23:59:59.000Z

294

DAKOTA reliability methods applied to RAVEN/RELAP-7.  

SciTech Connect

This report summarizes the result of a NEAMS project focused on the use of reliability methods within the RAVEN and RELAP-7 software framework for assessing failure probabilities as part of probabilistic risk assessment for nuclear power plants. RAVEN is a software tool under development at the Idaho National Laboratory that acts as the control logic driver and post-processing tool for the newly developed Thermal-Hydraulic code RELAP-7. Dakota is a software tool developed at Sandia National Laboratories containing optimization, sensitivity analysis, and uncertainty quantification algorithms. Reliability methods are algorithms which transform the uncertainty problem to an optimization problem to solve for the failure probability, given uncertainty on problem inputs and a failure threshold on an output response. The goal of this work is to demonstrate the use of reliability methods in Dakota with RAVEN/RELAP-7. These capabilities are demonstrated on a demonstration of a Station Blackout analysis of a simplified Pressurized Water Reactor (PWR).

Swiler, Laura Painton; Mandelli, Diego [Idaho National Laboratory, Idaho Falls, ID; Rabiti, Cristian [Idaho National Laboratory, Idaho Falls, ID; Alfonsi, Andrea [Idaho National Laboratory, Idaho Falls, ID

2013-09-01T23:59:59.000Z

295

FY 2010 Second Quarter Report Evaluation of the Liu-Daum-McGraw (LDM) Drizzle Threshold Parameterization using Measurements from the VAMOS Ocean-Cloud-Atmosphere Land Study (VOCALS) Field Campaign  

SciTech Connect

Metric for Quarter 2: Evaluate LDM (Liu, Daum, McGraw) drizzle threshold parameterization for a range of cloud conditions by comparing the threshold function computed using measurements of cloud droplet number concentration and cloud liquid water content to measurements of drizzle droplet number concentrations and/or drizzle water content.

McGraw, R; Kleinman, LI; Springston, SR; Daum, PH; Senum, G; Wang, J

2011-04-04T23:59:59.000Z

296

Experimental characterization of multiscale and multifield turbulence as a critical gradient threshold is surpassed in the DIII-D tokamak  

SciTech Connect

A critical gradient for long wavelength (k{sub ?}?{sub s}?0.4) electron temperature fluctuations has been observed in an experiment in the DIII-D tokamak [J. L. Luxon, Nucl. Fusion 42, 614 (2002)], where below a threshold value of L{sub T{sub e}{sup ?1}}=|?T{sub e}|/T{sub e} electron temperature fluctuations are constant and above they steadily increase. Above the critical gradient, the electron heat flux inferred by power balance also increases rapidly. Critical gradients are a predicted attribute of turbulence arising from linear instabilities and are thought to be related to transport stiffness. The presented results are the first direct, systematic demonstration of critical gradient behavior in turbulence measurements in a tokamak. The experiment was performed by changing the deposition location of electron cyclotron heating shot-to-shot to locally scan L{sub T{sub e}{sup ?1}} at r/a = 0.6 in L-mode plasmas; rotation was also varied by changing the momentum input from neutral beam injection. Temperature fluctuations were measured with a correlation electron cyclotron emission (CECE) radiometry system. In addition to the CECE measurements, an array of turbulence measurements were acquired to characterize fluctuations in multiple fields and at multiple scales as L{sub T{sub e}{sup ?1}} and rotation were modified: long wavelength (k{sub ?}?{sub s}?0.5) density fluctuations were acquired with beam emission spectroscopy, the phase angle between electron temperature and density fluctuations was measured by coupling the CECE system and a reflectometer, intermediate scale (k{sub ?}?{sub s}?0.8) density fluctuations were measured with a Doppler backscattering (DBS) system, and low frequency flows were also measured with DBS. The accumulated measurements and trends constrain identification of the instability responsible for the observed critical gradient to the ?T{sub e}-driven trapped electron mode.

Hillesheim, J. C.; Peebles, W. A.; Carter, T. A.; Wang, G.; Rhodes, T. L.; Schmitz, L.; Doyle, E. J.; Zeng, L. [University of California Los Angeles, PO Box 957099, Los Angeles, California 90024-1547 (United States)] [University of California Los Angeles, PO Box 957099, Los Angeles, California 90024-1547 (United States); DeBoo, J. C.; Staebler, G. M.; Burrell, K. H.; Petty, C. C.; Smith, S. P. [General Atomics, PO Box 85608, San Diego, California 92186-5608 (United States)] [General Atomics, PO Box 85608, San Diego, California 92186-5608 (United States); McKee, G. R.; Yan, Z. [University of Wisconsin-Madison, 1500 Engineering Dr., Madison, Wisconsin 53706-1687 (United States)] [University of Wisconsin-Madison, 1500 Engineering Dr., Madison, Wisconsin 53706-1687 (United States); Holland, C. [University of California San Diego, 9500 Gilman Dr., La Jolla, California 92093-0417 (United States)] [University of California San Diego, 9500 Gilman Dr., La Jolla, California 92093-0417 (United States); White, A. E. [Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)] [Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2013-05-15T23:59:59.000Z

297

Systems and methods for initializing a charging system  

DOE Patents (OSTI)

Systems and methods are provided for initiating a charging system. The method, for example, may include, but is not limited to, providing, by the charging system, an incrementally increasing voltage to a battery up to a first predetermined threshold while the energy conversion module has a zero-percent duty cycle, providing, by the charging system, an incrementally increasing voltage to the battery from an initial voltage level of the battery up to a peak voltage of a voltage source while the energy conversion module has a zero-percent duty cycle, and providing, by the charging system, an incrementally increasing voltage to the battery by incrementally increasing the duty cycle of the energy conversion module.

Ransom, Ray M.; Perisic, Milun; Kajouke, Lateef A.

2014-09-09T23:59:59.000Z

298

Systems and methods for initializing a charging system  

DOE Patents (OSTI)

Systems and methods are provided for initiating a charging system. The method, for example, may include, but is not limited to, providing, by the charging system, an incrementally increasing voltage to a battery up to a first predetermined threshold while the energy conversion module has a zero-percent duty cycle, providing, by the charging system, an incrementally increasing voltage to the battery from an initial voltage level of the battery up to a peak voltage of a voltage source while the energy conversion module has a zero-percent duty cycle, and providing, by the charging system, an incrementally increasing voltage to the battery by incrementally increasing the duty cycle of the energy conversion module.

Ransom, Ray M; Perisic, Milun; Kajouke, Lateef A

2014-06-24T23:59:59.000Z

299

Method for nonlinear optimization for gas tagging and other systems  

DOE Patents (OSTI)

A method and system are disclosed for providing nuclear fuel rods with a configuration of isotopic gas tags. The method includes selecting a true location of a first gas tag node, selecting initial locations for the remaining n-1 nodes using target gas tag compositions, generating a set of random gene pools with L nodes, applying a Hopfield network for computing on energy, or cost, for each of the L gene pools and using selected constraints to establish minimum energy states to identify optimal gas tag nodes with each energy compared to a convergence threshold and then upon identifying the gas tag node continuing this procedure until establishing the next gas tag node until all remaining n nodes have been established. 6 figs.

Chen, T.; Gross, K.C.; Wegerich, S.

1998-01-06T23:59:59.000Z

300

Method for nonlinear optimization for gas tagging and other systems  

DOE Patents (OSTI)

A method and system for providing nuclear fuel rods with a configuration of isotopic gas tags. The method includes selecting a true location of a first gas tag node, selecting initial locations for the remaining n-1 nodes using target gas tag compositions, generating a set of random gene pools with L nodes, applying a Hopfield network for computing on energy, or cost, for each of the L gene pools and using selected constraints to establish minimum energy states to identify optimal gas tag nodes with each energy compared to a convergence threshold and then upon identifying the gas tag node continuing this procedure until establishing the next gas tag node until all remaining n nodes have been established.

Chen, Ting (Chicago, IL); Gross, Kenny C. (Bolingbrook, IL); Wegerich, Stephan (Glendale Heights, IL)

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
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301

Methods for improved forewarning of condition changes in monitoring physical processes  

DOE Patents (OSTI)

This invention teaches further improvements in methods for forewarning of critical events via phase-space dissimilarity analysis of data from biomedical equipment, mechanical devices, and other physical processes. One improvement involves objective determination of a forewarning threshold (U.sub.FW), together with a failure-onset threshold (U.sub.FAIL) corresponding to a normalized value of a composite measure (C) of dissimilarity; and providing a visual or audible indication to a human observer of failure forewarning and/or failure onset. Another improvement relates to symbolization of the data according the binary numbers representing the slope between adjacent data points. Another improvement relates to adding measures of dissimilarity based on state-to-state dynamical changes of the system. And still another improvement relates to using a Shannon entropy as the measure of condition change in lieu of a connected or unconnected phase space.

Hively, Lee M.

2013-04-09T23:59:59.000Z

302

Physics-based, Bayesian sequential detection method and system for radioactive contraband  

DOE Patents (OSTI)

A distributed sequential method and system for detecting and identifying radioactive contraband from highly uncertain (noisy) low-count, radionuclide measurements, i.e. an event mode sequence (EMS), using a statistical approach based on Bayesian inference and physics-model-based signal processing based on the representation of a radionuclide as a monoenergetic decomposition of monoenergetic sources. For a given photon event of the EMS, the appropriate monoenergy processing channel is determined using a confidence interval condition-based discriminator for the energy amplitude and interarrival time and parameter estimates are used to update a measured probability density function estimate for a target radionuclide. A sequential likelihood ratio test is then used to determine one of two threshold conditions signifying that the EMS is either identified as the target radionuclide or not, and if not, then repeating the process for the next sequential photon event of the EMS until one of the two threshold conditions is satisfied.

Candy, James V; Axelrod, Michael C; Breitfeller, Eric F; Chambers, David H; Guidry, Brian L; Manatt, Douglas R; Meyer, Alan W; Sale, Kenneth E

2014-03-18T23:59:59.000Z

303

We've found an error in our paper. In the threshold signature scheme that we used, there are restrictions on the threshold value. In particular if the key is shared over a degree t polynomial, then 2t+1 players (not t+1)  

E-Print Network (OSTI)

and will be updating the paper accordingly. Securing Bitcoin wallets via threshold signatures Steven Goldfeder stevenag@cs.princeton.edu Arvind Narayanan arvindn@cs.princeton.edu ABSTRACT The Bitcoin ecosystem has suffered frequent thefts serious. Due to the irre- versibility, automation, and pseudonymity of transactions, Bitcoin currently

Singh, Jaswinder Pal

304

Dissociation of internal energy-selected methyl bromide ion revealed from threshold photoelectron-photoion coincidence velocity imaging  

SciTech Connect

Dissociative photoionization of methyl bromide (CH{sub 3}Br) in an excitation energy range of 10.45–16.90 eV has been investigated by using threshold photoelectron-photoion coincidence (TPEPICO) velocity imaging. The coincident time-of-flight mass spectra indicate that the ground state X{sup 2}E of CH{sub 3}Br{sup +} is stable, and both A{sup 2}A{sub 1} and B{sup 2}E ionic excited states are fully dissociative to produce the unique fragment ion of CH{sub 3}{sup +}. From TPEPICO 3D time-sliced velocity images of CH{sub 3}{sup +} dissociated from specific state-selected CH{sub 3}Br{sup +} ion, kinetic energy release distribution (KERD) and angular distribution of CH{sub 3}{sup +} fragment ion are directly obtained. Both spin-orbit states of Br({sup 2}P) atom can be clearly observed in fast dissociation of CH{sub 3}Br{sup +}(A{sup 2}A{sub 1}) ion along C–Br rupture, while a KERD of Maxwell-Boltzmann profile is obtained in dissociation of CH{sub 3}Br{sup +}(B{sup 2}E) ion. With the aid of the re-calculated potential energy curves of CH{sub 3}Br{sup +} including spin-orbit coupling, dissociation mechanisms of CH{sub 3}Br{sup +} ion in A{sup 2}A{sub 1} and B{sup 2}E states along C–Br rupture are revealed. For CH{sub 3}Br{sup +}(A{sup 2}A{sub 1}) ion, the CH{sub 3}{sup +} + Br({sup 2}P{sub 1/2}) channel is occurred via an adiabatic dissociation by vibration, while the Br({sup 2}P{sub 3/2}) formation is through vibronic coupling to the high vibrational level of X{sup 2}E state followed by rapid dissociation. C–Br bond breaking of CH{sub 3}Br{sup +}(B{sup 2}E) ion can occur via slow internal conversion to the excited vibrational level of the lower electronic states and then dissociation.

Tang, Xiaofeng [Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 (China) [Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 (China); National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029 (China); Zhou, Xiaoguo, E-mail: xzhou@ustc.edu.cn, E-mail: yanbing@jlu.edu.cn; Liu, Shilin [Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 (China) [Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 (China); Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China); Sun, Zhongfa [Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 (China)] [Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 (China); Liu, Fuyi; Sheng, Liusi [National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029 (China)] [National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029 (China); Yan, Bing, E-mail: xzhou@ustc.edu.cn, E-mail: yanbing@jlu.edu.cn [Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012 (China)] [Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012 (China)

2014-01-28T23:59:59.000Z

305

Material Point Methods  

NLE Websites -- All DOE Office Websites (Extended Search)

Material Point Methods and Multiphysics for Fracture and Multiphase Problems Joseph Teran, UCLA and Alice Koniges, LBL Contact: jteran@math.ucla.edu Material point methods (MPM)...

306

08/05/2006 12:16 AM3-D Computer-Automated Threshold Amsler Grid Test Page 1 of 8http://www-aig.jpl.nasa.gov/public/mls/home/wfink/3DVisualFieldTest.htm  

E-Print Network (OSTI)

08/05/2006 12:16 AM3-D Computer-Automated Threshold Amsler Grid Test Page 1 of 8http://www-aig.jpl.nasa.gov/public/mls/home: #12;08/05/2006 12:16 AM3-D Computer-Automated Threshold Amsler Grid Test Page 5 of 8http://www-aig.jpl.nasa.gov/public/mls/home/wfink/3DVisualFieldTest.htm Introduction The 3-D Computer-Automated Threshold Amsler Grid Test is a five

Arizona, University of

307

Second moment method for a family of boolean CSP  

E-Print Network (OSTI)

The estimation of phase transitions in random boolean Constraint Satisfaction Problems (CSP) is based on two fundamental tools: the first and second moment methods. While the first moment method on the number of solutions permits to compute upper bounds on any boolean CSP, the second moment method used for computing lower bounds proves to be more tricky and in most cases gives only the trivial lower bound 0. In this paper, we define a subclass of boolean CSP covering the monotone versions of many known NP-Complete boolean CSPs. We give a method for computing non trivial lower bounds for any member of this subclass. This is achieved thanks to an application of the second moment method to some selected solutions called characteristic solutions that depend on the boolean CSP considered. We apply, as an example, this method to establish that the threshold r_{k} of monotone 1-in-k-SAT is \\log k/k\\leq r_{k}\\leq\\log^{2}k/k

Boufkhad, Yacine

2011-01-01T23:59:59.000Z

308

Please cite this article in press as: Hart, S.J., Laroque, C.P., Searching for thresholds in climateradial growth rela-tionships of Engelmann spruce and subalpine fir, Jasper National Park, Alberta, Canada. Dendrochronologia (2012),  

E-Print Network (OSTI)

in climate­radial growth rela- tionships of Engelmann spruce and subalpine fir, Jasper National Park, Alberta for thresholds in climate­radial growth relationships of Engelmann spruce and subalpine fir, Jasper National Park

Walters, Bradley B.

309

Method for enhanced control of welding processes  

DOE Patents (OSTI)

Method and system for producing high quality welds in welding processes, in general, and gas tungsten arc (GTA) welding, in particular by controlling weld penetration. Light emitted from a weld pool is collected from the backside of a workpiece by optical means during welding and transmitted to a digital video camera for further processing, after the emitted light is first passed through a short wavelength pass filter to remove infrared radiation. By filtering out the infrared component of the light emitted from the backside weld pool image, the present invention provides for the accurate determination of the weld pool boundary. Data from the digital camera is fed to an imaging board which focuses on a 100.times.100 pixel portion of the image. The board performs a thresholding operation and provides this information to a digital signal processor to compute the backside weld pool dimensions and area. This information is used by a control system, in a dynamic feedback mode, to automatically adjust appropriate parameters of a welding system, such as the welding current, to control weld penetration and thus, create a uniform weld bead and high quality weld.

Sheaffer, Donald A. (Livermore, CA); Renzi, Ronald F. (Tracy, CA); Tung, David M. (Livermore, CA); Schroder, Kevin (Pleasanton, CA)

2000-01-01T23:59:59.000Z

310

Experimental study of the p+{sup 6}Li{yields}{eta}+{sup 7}Be reaction 11.3 MeV above threshold  

SciTech Connect

The cross section for the reaction p+{sup 6}Li{yields}{eta}+{sup 7}Be was measured at an excess energy of 11.28 MeV above threshold by detecting the recoiling {sup 7}Be nuclei. A dedicated set of focal plane detectors was built for the magnetic spectrograph Big Karl and was used for identification and four-momentum measurement of {sup 7}Be. A differential cross section of nb/(d{sigma}/d{Omega})=[0.69{+-}0.20(stat.){+-}0.20(syst.)] sr for the ground state plus 1/2{sup -} was measured. The result is compared to model calculations.

Budzanowski, A.; Kliczewski, S.; Siudak, R. [Institute of Nuclear Physics, Polska Akademia Nauk, Radzikowskiego 152, PL-31342 Krakow (Poland); Chatterjee, A.; Jha, V.; Roy, B. J. [Nuclear Physics Division, Bhabha Atomic Research Centre, Trombay, 400 085-Mumbai (India); Hawranek, P.; Magiera, A. [Institute of Physics, Jagellonian University, Reymonta 4, PL-30059 Krakow (Poland); Jahn, R. [Helmholtz-Institut fuer Strahlen- und Kernphysik der Universitaet Bonn, D-53115 Bonn (Germany); Kilian, K.; Maier, R.; Protic, D.; Ritman, J.; Rossen, P. von [Institut fuer Kernphysik, Forschungszentrum Juelich, D-52425 Juelich (Germany); Kirillov, Da.; Machner, H. [Institut fuer Kernphysik, Forschungszentrum Juelich, D-52425 Juelich (Germany); Fachbereich Physik, Universitaet Duisburg-Essen, D-47048 Duisburg (Germany); Kirillov, Di.; Piskunov, N.; Sitnik, I. [Laboratory for High Energies, Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Moscow region (Russian Federation); Kolev, D. [Physics Faculty, University of Sofia, 1164 Sofia (Bulgaria)

2010-10-15T23:59:59.000Z

311

A theory for calculating the surface-adsorbate bond dissociation energy from collision-induced desorption threshold measurements  

E-Print Network (OSTI)

-induced desorption measurements. D, is calculated from the minimum collision energy required for desorption. Thermal desorption spectroscopy (TDS ) is the current technique used for measuring surface bond energies.' As with all thermal methods, a TDS ex- periment is constrained to measure the activation energy of the pathway

Levis, Robert J.

312

4 IEEE TRANSACTIONS ON NANOTECHNOLOGY, VOL. 8, NO. 1, JANUARY 2009 Threshold Voltage and OnOff Ratio Tuning  

E-Print Network (OSTI)

in both inverter fanout-of-4 (FO4) delay (4.7Ã?) and energy per cycle (2.6Ã?) [5]. Multiple-tube CNFETs also enable new methods for tuning the device characteristics previously impossible with single-tube CNFETs performance and reduced power dissipation. Similarly, a poor ION/IOFF can cause slow output transitions

Zhou, Chongwu

313

Hydrogen Production Methods  

Science Journals Connector (OSTI)

Commercially available hydrogen production methods such as steam reforming of natural gas, ... process that are based on fossil hydrocarbons and methods in the stage of development, like thermolysis ... radiolysi...

Y. Yürüm

1995-01-01T23:59:59.000Z

314

Lattice Boltzmann Method  

Science Journals Connector (OSTI)

The lattice Boltzmann method is a discrete computational method based upon the lattice gas automata — a simplified, fictitious molecular ... model. It consists of three basic tasks: lattice Boltzmann equation, lattice

Dr. Jian Guo Zhou

2004-01-01T23:59:59.000Z

315

Method of intrinsic marking  

DOE Patents (OSTI)

A method of pulsed laser intrinsic marking can provide a unique identifier to detect tampering or counterfeiting.

Adams, David P; McDonald, Joel Patrick; Jared, Bradley Howell; Hodges, V. Carter; Hirschfeld, Deidre; Blair, Dianna S

2014-04-01T23:59:59.000Z

316

Photoproduction of pi0pi0 and pi0pi+-pairs off the proton from threshold to the second resonance region  

E-Print Network (OSTI)

Precise total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing $p\\pi^0\\pi^0$ and $n\\pi^+\\pi^0$ final states from the threshold region up to 800 MeV incident photon energy. Additionally, beam helicity asymmetries have been measured in the second resonance region (550 MeV - 820 MeV). The experiment was performed at the tagged photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4$\\pi$ solid-angle electromagnetic calorimeter. The results are much more precise than any previous measurements and confirm the chiral perturbation theory predictions for the threshold behavior of these reactions. In the second resonance region, the invariant-mass distributions of meson-meson and meson-nucleon pairs are in reasonable agreement with model predictions, but none of the models reproduce the asymmetries for the mixed-charge channel.

F. Zehr; B. Krusche; P. Aguar; J. Ahrens; J. R. M. Annand; H. J. Arends; R. Beck; V. Bekrenev; B. Boillat; A. Braghieri; D. Branford; W. J. Briscoe; J. Brudvik; S. Cherepnya; R. F. B. Codling; E. J. Downie; P. Drexler; D. I. Glazier; L. V. Fil'kov; R. Gregor; E. Heid; D. Hornidge; I. Jaegle; O. Jahn; V. L. Kashevarov; A. Knezevic; R. Kondratiev; M. Korolija; M. Kotulla; D. Krambrich; A. Kulbardis; M. Lang; V. Lisin; K. Livingston; S. Lugert; I. J. D. MacGregor; D. M. Manley; Y. Maghrbi; M. Martinez; J. C. McGeorge; D. Mekterovic; V. Metag; B. M. K. Nefkens; A. Nikolaev; M. Ostrick; P. Pedroni; F. Pheron; A. Polonski; S. Prakhov; J. W. Price; G. Rosner; M. Rost; T. Rostomyan; S. Schumann; D. Sober; A. Starostin; I. Supek; C. M. Tarbert; A. Thomas; M. Unverzagt; Th. Walcher; D. P. Watts

2012-07-10T23:59:59.000Z

317

Re-examination of the Linear No Threshold (LNT) hypothesis, and a trial for the public to comprehend the reality of the low-dose effects of radiation  

Science Journals Connector (OSTI)

People have imprinted knowledge of the LNT hypothesis. Use of the terms LNT hypothesis, ALARA, or stochastic effect, etc. clouds the understanding of people about the real effects of very low doses of radiation. In this paper, the scientific basis of the LNT hypothesis is re-examined. A denial of the presence of a threshold means that individuals have no protection from even very small doses or dose rates of radiation in the body. As the human population is heterogeneous, a linear dose-response curve is obtained, as even whole majorities have a threshold. Current results from radiation epidemiological studies and experimental studies from cells and animals were reported by experts from USA, Canada and Japan at the Radition Effects Association (REA) symposium in March 2005 in Tokyo. The findings did not support the LNT hypothesis, but the importance of biological reactions and factors involving radiation-carcinogenesis. Even a few antinuclear audiences started to think about the presence of a body-defence mechanism against radiation. Necessary information on radiation-carcinogenesis is summarised in several figures for better comprehensions by the public.

Junko Matsubara

2006-01-01T23:59:59.000Z

318

On using Extreme Values to detect global stability thresholds in multi-stable systems: The case of transitional plane Couette flow  

E-Print Network (OSTI)

Extreme Value Theory (EVT) is exploited to determine the global stability threshold $R_g$ of plane Couette flow --the flow of a viscous fluid in the space between two parallel plates-- whose laminar or turbulent behavior depends on the Reynolds number R. Even if the existence of a global stability threshold has been detected in simulations and experiments, its numerical value has not been unequivocally defined. $R_g$ is the value such that for $R > R_g$ turbulence is sustained, whereas for $R energy fluctuations. When $R_g$, both the positive and negative extremes are bounded. As the critical Reynolds number is approached from above, the probability of observing a very low minimum increases causing asymmetries in the distributions of maxima and minima. On the other hand, the maxima distribution is unaffected as the fluctuations towards higher values of the perturbation energy remain bounded. This tipping point can be detected by fitting the data to the Generalized Extreme Value (GEV) distribution and by identifying $R_g$ as the value of $R$ such that the shape parameter of the GEV for the minima changes sign from negative to positive. The results are supported by the analysis of theoretical models which feature a bistable behavior.

Davide Faranda; Valerio Lucarini; Paul Manneville; Jeroen Wouters

2014-03-21T23:59:59.000Z

319

Combustible structural composites and methods of forming combustible structural composites  

DOE Patents (OSTI)

Combustible structural composites and methods of forming same are disclosed. In an embodiment, a combustible structural composite includes combustible material comprising a fuel metal and a metal oxide. The fuel metal is present in the combustible material at a weight ratio from 1:9 to 1:1 of the fuel metal to the metal oxide. The fuel metal and the metal oxide are capable of exothermically reacting upon application of energy at or above a threshold value to support self-sustaining combustion of the combustible material within the combustible structural composite. Structural-reinforcing fibers are present in the composite at a weight ratio from 1:20 to 10:1 of the structural-reinforcing fibers to the combustible material. Other embodiments and aspects are disclosed.

Daniels, Michael A.; Heaps, Ronald J.; Steffler, Eric D.; Swank, W. David

2013-04-02T23:59:59.000Z

320

Combustible structural composites and methods of forming combustible structural composites  

DOE Patents (OSTI)

Combustible structural composites and methods of forming same are disclosed. In an embodiment, a combustible structural composite includes combustible material comprising a fuel metal and a metal oxide. The fuel metal is present in the combustible material at a weight ratio from 1:9 to 1:1 of the fuel metal to the metal oxide. The fuel metal and the metal oxide are capable of exothermically reacting upon application of energy at or above a threshold value to support self-sustaining combustion of the combustible material within the combustible structural composite. Structural-reinforcing fibers are present in the composite at a weight ratio from 1:20 to 10:1 of the structural-reinforcing fibers to the combustible material. Other embodiments and aspects are disclosed.

Daniels, Michael A. (Idaho Falls, ID); Heaps, Ronald J. (Idaho Falls, ID); Steffler, Eric D (Idaho Falls, ID); Swank, William D. (Idaho Falls, ID)

2011-08-30T23:59:59.000Z

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Insulation Resistance Measurement Methods  

Science Journals Connector (OSTI)

A traditional method of insulation resistance measurement in live DC networks is ... of an ammeter is described. Formulas for insulation equivalent resistance calculation are derived with help...

Piotr Olszowiec

2013-01-01T23:59:59.000Z

322

Accelerated Molecular Dynamics Methods  

Energy.gov (U.S. Department of Energy (DOE))

This presentation on Accelerated Molecular Dynamics Methods was given at the DOE Theory Focus Session on Hydrogen Storage Materials on May 18, 2006.

323

Air quality modelling as a supplementary assessment method in the framework of the European Air Quality Directive  

Science Journals Connector (OSTI)

According to the European Air Quality (AQ) Directive, member states must annually report their AQ to the European Commission (EC). This report can be based on modelling data if the concentration levels do not exceed the established lower assessment thresholds (LAT), or on combined data from modelling and monitoring systems (supplementary assessment methods) if concentrations levels are below the upper assessment threshold (UAT). This work presents and applies a methodology that combines air pollutant concentration values from monitored data and from a numerical modelling system to deliver AQ information for Portugal in 2010. This methodology produces improved information, especially for areas where the amount of fixed monitoring stations is sparse or non-existent, allowing obtaining a better and broader overview of the AQ in Portugal to support AQ reporting to the European Commission.

I. Ribeiro; A. Monteiro; A.P. Fernandes; A.C. Monteiro; M. Lopes; C. Borrego; A.I. Miranda

2014-01-01T23:59:59.000Z

324

Radiation damage to amorphous carbon thin films irradiated by multiple 46.9 nm laser shots below the single-shot damage threshold  

SciTech Connect

High-surface-quality amorphous carbon (a-C) optical coatings with a thickness of 45 nm, deposited by magnetron sputtering on a silicon substrate, were irradiated by the focused beam of capillary-discharge Ne-like Ar extreme ultraviolet laser (CDL=capillary-discharge laser; XUV=extreme ultraviolet, i.e., wavelengths below 100 nm). The laser wavelength and pulse duration were 46.9 nm and 1.7 ns, respectively. The laser beam was focused onto the sample surface by a spherical Sc/Si multilayer mirror with a total reflectivity of about 30%. The laser pulse energy was varied from 0.4 to 40 muJ on the sample surface. The irradiation was carried out at five fluence levels between 0.1 and 10 J/cm{sup 2}, accumulating five different series of shots, i.e., 1, 5, 10, 20, and 40. The damage to the a-C thin layer was investigated by atomic force microscopy (AFM) and Nomarski differential interference contrast (DIC) optical microscopy. The dependence of the single-shot-damaged area on pulse energy makes it possible to determine a beam spot diameter in the focus. Its value was found to be equal to 23.3+-3.0 mum using AFM data, assuming the beam to have a Gaussian profile. Such a plot can also be used for a determination of single-shot damage threshold in a-C. A single-shot threshold value of 1.1 J/cm{sup 2} was found. Investigating the consequences of the multiple-shot exposure, it has been found that an accumulation of 10, 20, and 40 shots at a fluence of 0.5 J/cm{sup 2}, i.e., below the single-shot damage threshold, causes irreversible changes of thin a-C layers, which can be registered by both the AFM and the DIC microscopy. In the center of the damaged area, AFM shows a-C removal to a maximum depth of 0.3, 1.2, and 1.5 nm for 10-, 20- and 40-shot exposure, respectively. Raman microprobe analysis does not indicate any change in the structure of the remaining a-C material. The erosive behavior reported here contrasts with the material expansion observed earlier [L. Juha et al., Proc. SPIE 5917, 91 (2005)] on an a-C sample irradiated by a large number of femtosecond pulses of XUV high-order harmonics.

Juha, L.; Hajkova, V.; Vorlicek, V. [Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8 (Czech Republic); Chalupsky, J. [Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8 (Czech Republic); Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehova 7, 115 19 Prague 1 (Czech Republic); Ritucci, A.; Reale, A.; Zuppella, P. [Department of Physics, University of L'Aquila, gc Laboratorio Nazionale del Gran Sasso (Istituto Nazionale di Fisica Nucleare-INFN), 67010 Coppito, L'Aquila (Italy); Stoermer, M. [GKSS Research Center, Max-Planck-Strasse 1, D-21502 Geesthacht (Germany)

2009-05-01T23:59:59.000Z

325

An 8-{mu}m quantum cascade laserproduced by the metalorganic vapour phase epitaxy method  

SciTech Connect

An 8-{mu}m quantum cascade laser is fabricated by the metalorganic vapour phase epitaxy method. A scheme of vertical transitions in a structure consisting of three quantum wells is used. The laser operates in a pulsed regime at temperatures up to 250 K. The threshold current density was about 3 kA cm{sup -2} and increased up to 6 kA cm{sup -2} at 250 K. The 1-{mu}s pulse power in the multimode regime was 45 mW at 77 K.

Zasavitskii, I I; Pashkeev, D A [P N Lebedev Physical Institute, Russian Academy of Sciences, Moscow (Russian Federation); Marmalyuk, Aleksandr A; Ryaboshtan, Yu L [M.F. Stel'makh Polyus Research and Development Institute, Moscow (Russian Federation); Mikaelyan, G T [OJSC Research and Manufacturing Enterprise 'Inject', Saratov (Russian Federation)

2010-02-28T23:59:59.000Z

326

Method of forming nanodielectrics  

DOE Patents (OSTI)

A method of making a nanoparticle filled dielectric material. The method includes mixing nanoparticle precursors with a polymer material and reacting the nanoparticle mixed with the polymer material to form nanoparticles dispersed within the polymer material to form a dielectric composite.

Tuncer, Enis [Knoxville, TN; Polyzos, Georgios [Oak Ridge, TN

2014-01-07T23:59:59.000Z

327

Accelerated Metropolis method  

Science Journals Connector (OSTI)

It is shown that the freedom in the choice of the proposal matrix in the generalized Metropolis method can be used to greatly enhance the efficiency of the method. For example, the difficulties associated with the existence of multiple length scales in electronic structure calculations can be avoided by making an intelligent choice. Results are presented for Ne, Ar, and Li2.

C. J. Umrigar

1993-07-19T23:59:59.000Z

328

Water treatment method  

DOE Patents (OSTI)

A method is described for reducing the concentration of any undesirable metals dissolved in contaminated water, such as waste water. The method involves uniformly reacting the contaminated water with an excess amount of solid particulate calcium sulfite to insolubilize the undesirable metal ions, followed by removal thereof and of the unreacted calcium sulfite.

Martin, F.S.; Silver, G.L.

1991-04-30T23:59:59.000Z

329

Methods for data classification  

DOE Patents (OSTI)

The present invention provides methods for classifying data and uncovering and correcting annotation errors. In particular, the present invention provides a self-organizing, self-correcting algorithm for use in classifying data. Additionally, the present invention provides a method for classifying biological taxa.

Garrity, George (Okemos, MI); Lilburn, Timothy G. (Front Royal, VA)

2011-10-11T23:59:59.000Z

330

Normalized Tritium Quantification Approach (NoTQA) a Method for Quantifying Tritium Contaminated Trash and Debris at LLNL  

SciTech Connect

Several facilities and many projects at LLNL work exclusively with tritium. These operations have the potential to generate large quantities of Low-Level Radioactive Waste (LLW) with the same or similar radiological characteristics. A standardized documented approach to characterizing these waste materials for disposal as radioactive waste will enhance the ability of the Laboratory to manage them in an efficient and timely manner while ensuring compliance with all applicable regulatory requirements. This standardized characterization approach couples documented process knowledge with analytical verification and is very conservative, overestimating the radioactivity concentration of the waste. The characterization approach documented here is the Normalized Tritium Quantification Approach (NoTQA). This document will serve as a Technical Basis Document which can be referenced in radioactive waste characterization documentation packages such as the Information Gathering Document. In general, radiological characterization of waste consists of both developing an isotopic breakdown (distribution) of radionuclides contaminating the waste and using an appropriate method to quantify the radionuclides in the waste. Characterization approaches require varying degrees of rigor depending upon the radionuclides contaminating the waste and the concentration of the radionuclide contaminants as related to regulatory thresholds. Generally, as activity levels in the waste approach a regulatory or disposal facility threshold the degree of required precision and accuracy, and therefore the level of rigor, increases. In the case of tritium, thresholds of concern for control, contamination, transportation, and waste acceptance are relatively high. Due to the benign nature of tritium and the resulting higher regulatory thresholds, this less rigorous yet conservative characterization approach is appropriate. The scope of this document is to define an appropriate and acceptable characterization method for quantification of tritium contaminated trash and debris. The characterization technique is applicable to surface and subsurface tritium contaminated materials with surfaces amenable to swiping. Some limitations of this characterization technique are identified.

Dominick, J L; Rasmussen, C L

2008-07-23T23:59:59.000Z

331

Optical breakdown threshold in nanosecond high repetition second harmonic generation by periodically poled Mg-doped LiTaO{sub 3} crystal  

SciTech Connect

Our study shows that a local temperature increase of ?1 K in the crystal lattice caused by second harmonic generation (SHG) and two-photon absorption of 532 nm radiation at the rear of periodically poled stoichiometric LiTaO{sub 3} crystal by changing spontaneous polarization induces a pyroelectric field ?10 kV/cm, accelerating free electrons to an energy of ?10 eV, followed by optical breakdown and crystal damage. Theoretical analysis leads to an explicit expression for the threshold laser fluence of optical breakdown giving ?1.2 J/cm{sup 2} for 1064 nm input radiation in 6.8 kHz pulsed SHG operation, agreeing well with the experimentally found value ?1.32 J/cm{sup 2}.

Louchev, Oleg A.; Wada, Satoshi [Center for Advanced Photonics, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)] [Center for Advanced Photonics, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Hatano, Hideki; Kitamura, Kenji [Division of Environment and Energy Materials, National Institute for Materials Science (NIMS) 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)] [Division of Environment and Energy Materials, National Institute for Materials Science (NIMS) 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)

2013-08-26T23:59:59.000Z

332

Defect structures and the MgO-doping-level-threshold effect on the optical absorption of reduced MgO-doped lithium niobate  

Science Journals Connector (OSTI)

Congruent LiNbO3 crystals have been doped with Mg impurity to levels of 1.0, 2.7, 5.0, and 6.0 mol %. With doping levels between 5.0 and 6.0 mol %, there was an abrupt change in the features of the optical absorption. This observation is consistent with our theoretical calculation, which independently predicted that the critical magnesium concentration, [Mg], for the threshold effect should occur at [Mg]c=5.3 mol %. The spectra exhibit anisotropy. Defect-structure models are proposed. We demonstrate that, under thermochemical reduction, the density of the crystal increases and oxygen vacancies are also formed. We propose that when congruent crystals are thermochemically reduced, the observed optical absorptions are due to defects comprising both oxygen vacancies and different types of dipolarons.

Qi-Ren Zhang and Xi-Qi Feng

1991-05-15T23:59:59.000Z

333

Insight into threshold dynamics of two-electron escape from electron-impact ionization spin-asymmetry studies of valence-one atoms  

SciTech Connect

The conventional description of the behavior of two-electron escape near threshold is usually summarized by the Wannier power law, {sigma}=aE{sup {eta}}+bE{sup 2{eta}}, for the ionization cross section, {sigma}, as a function of the total escape energy, E, where a and b are constants and {eta}=1.127 for a residual ionic core of unit charge. It is known that departures from this simple formalism occur as a result of dynamical influences on the inside part of the two-electron wave function and that these departures can be observed through spin-dependent ionization measurements. Comparative studies of impact ionization asymmetries for H, He, Li, Na, K, and Cs now reveal the striking influence of the ionic core on the double-escape process.

Lubell, M.S.

1993-05-01T23:59:59.000Z

334

Evidence for a Narrow Near-Threshold Structure in the $J/\\psi\\phi$ Mass Spectrum in $B^+\\to J/\\psi\\phi K^+$ Decays  

SciTech Connect

Evidence is reported for a narrow structure near the J/{psi}{phi} threshold in exclusive B{sup +} {yields} J/{psi}{phi}K{sup +} decays produced in {bar p}p collisions at {radical}s = 1.96 TeV. A signal of 14 {+-} 5 events, with statistical significance in excess of 3.8 standard deviations, is observed in a data sample corresponding to an integrated luminosity of 2.7 fb{sup -1}, collected by the CDF II detector. The mass and natural width of the structure are measured to be 4143.0 {+-} 2.9(stat) {+-} 1.2(syst) MeV/c{sup 2} and 11.7{sub -5.0}{sup +8.3}(stat) {+-} 3.7(syst) MeV/c{sup 2}.

Aaltonen, T.; /Helsinki Inst. of Phys.; Adelman, Jahred A.; /Chicago U., EFI; Akimoto, T.; /Tsukuba U.; Alvarez Gonzalez, B.; /Cantabria Inst. of Phys.; Amerio, S.; /INFN, Padua; Amidei, Dante E.; /Michigan U.; Anastassov, A.; /Northwestern U.; Annovi, Alberto; /Frascati; Antos, Jaroslav; /Comenius U.; Apollinari, G.; /Fermilab; Apresyan, A.; /Purdue U. /Waseda U.

2009-03-01T23:59:59.000Z

335

Search for Narrow Nucleon Resonances below Pion Threshold in the H(e,e'pi^+)X and D(e,e'p)X Reactions  

E-Print Network (OSTI)

In two series of high-resolution coincidence experiments at the three-spectrometer facility at MAMI, the H(e,e'pi^+)X and D(e,e'p)X reactions were studied to search for narrow nucleon resonances below pion threshold. The missing-mass resolution was 0.6 to 1.6 MeV/c^2 (FWHM) in the proton experiment and 0.9 to 1.3 MeV/c^2 in the deuteron experiment. The experiments covered the missing-mass region from the neutron mass up to about 1050 and 1100 MeV/c^2, respectively. None of our measurements showed a signal for narrow resonances to a level of down to 10^-4 with respect to the neutron peak in the missing-mass spectra.

M. Kohl; M. Ases Antelo; C. Ayerbe; D. Baumann; R. Boehm; D. Bosnar; M. Ding; M. O. Distler; J. Friedrich; J. Garcia Llongo; P. Jennewein; G. Jover Manas; H. Merkel; P. Merle; U. Mueller; R. Neuhausen; L. Nungesser; R. Perez Benito; J. Pochodzalla; M. Potokar; C. Rangacharyulu; A. Richter; G. Schrieder; M. Seimetz; Th. Walcher; M. Weis

2003-04-11T23:59:59.000Z

336

Enhancement of {pi}A{r_arrow}{pi}{pi}A threshold cross sections by in-medium {pi}{pi} final state interactions  

SciTech Connect

We address the problem of pion production in low-energy {pi}-nucleus collisions. For the production mechanism, we assume a simple model consisting of a coherent sum of single pion exchange and the excitation{emdash}followed by the decay into two pions and a nucleon{emdash}of the N{sup {asterisk}}(1440) resonance. The production amplitude is modified by the final state interaction between the pions calculated using the chirally improved J{umlt u}lich meson exchange model including the polarization of the nuclear medium by the pions. The model reproduces well the experimentally observed {pi}A{r_arrow}{pi}{pi}A cross sections, especially the enhancement with increasing {ital A} of the {pi}{sup +}{pi}{sup {minus}} mass distribution in the threshold region. {copyright} {ital 1999} {ital The American Physical Society}

Rapp, R. [Department of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, New York 11794-3800 (United States)] [Department of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, New York 11794-3800 (United States); Durso, J.W.; Krehl, O.; Speth, J. [Physics Department, Mount Holyoke College, South Hadley, Massachusetts 01075 (United States)] [Physics Department, Mount Holyoke College, South Hadley, Massachusetts 01075 (United States); Durso, J.W. [Institut fuer Kernphysik, Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany)] [Institut fuer Kernphysik, Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany); Aouissat, Z.; Wambach, J. [Institut fuer Kernphysik, Schlossgartenstrasse 9, TU-Darmstadt, D-64289 Darmstadt (Germany)] [Institut fuer Kernphysik, Schlossgartenstrasse 9, TU-Darmstadt, D-64289 Darmstadt (Germany); Chanfray, G. [IPN, IN2P3-CNRS/Universite Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918 F-69622 Villeurbanne Cedex (France)] [IPN, IN2P3-CNRS/Universite Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918 F-69622 Villeurbanne Cedex (France); Schuck, P. [ISN, IN2P3-CNRS/Universite Joseph Fourier, 53 Avenue de Martyrs, F-38026 Grenoble Cedex (France)] [ISN, IN2P3-CNRS/Universite Joseph Fourier, 53 Avenue de Martyrs, F-38026 Grenoble Cedex (France)

1999-03-01T23:59:59.000Z

337

Cleaning method and apparatus  

DOE Patents (OSTI)

A method of very thoroughly and quikcly cleaning a guaze electrode used in chemical analyses is given, as well as an automobile cleaning apparatus which makes use of the method. The method generates very little waste solution, and this is very important in analyzing radioactive materials, especially in aqueous solutions. The cleaning apparatus can be used in a larger, fully automated controlled potential coulometric apparatus. About 99.98% of a 5 mg plutonium sample was removed in less than 3 minutes, using only about 60 ml of rinse solution and two main rinse steps.

Jackson, D.D.; Hollen, R.M.

1981-02-27T23:59:59.000Z

338

Method for inducing hypothermia  

DOE Patents (OSTI)

Systems for phase-change particulate slurry cooling equipment and methods to induce hypothermia in a patient through internal and external cooling are provided. Subcutaneous, intravascular, intraperitoneal, gastrointestinal, and lung methods of cooling are carried out using saline ice slurries or other phase-change slurries compatible with human tissue. Perfluorocarbon slurries or other slurry types compatible with human tissue are used for pulmonary cooling. And traditional external cooling methods are improved by utilizing phase-change slurry materials in cooling caps and torso blankets.

Becker, Lance B. (Chicago, IL); Hoek, Terry Vanden (Chicago, IL); Kasza, Kenneth E. (Palos Park, IL)

2008-09-09T23:59:59.000Z

339

Langlie Test Method Program for use with the HP-41CV/X calculator  

SciTech Connect

Explosive component designers need to test the sensitivity of some unit response as a function level of stress, for example, the sensitivity of a detonator or ignitor bridgewire to input current. There exists a threshold level, above which the detonator will function and below which it will not. Statistical testing of explosive components often requires destructive testing of expensive hardware. If the unit functions, it is destroyed; and if it doesn't fire, the results from any further testing cannot be relied on because the initial test affects the detonator. In order to obtain meaningful results and not expend a large number of units, the Langlie ''One-Shot'' Method of testing is employed. Typical component attributes that require Langlie testing include ''all-fire'' and ''no-fire'' tests to determine threshold levels of performance. Generally, any sensitivity testing lends itself to the Langlie method. This method has also been shown to be insensitive to design. Typically, support test groups and venders implement the test method with their own computers. The method is subject to some interpretation which may lead to inconsistency in results from facility to facility. Another concern is that an error made in choosing a stimulus level will affect subsequent levels, resulting in an analysis that is not a true Langlie. A program has been written for the HP-41CV/X calculator in order to standardize the Langlie test procedures at the various facilities, and to minimize the possibilities of introducing errors in the test method. A distinct advantage of using the calculator is the ability to hand carry it in the field and perform the Langlie test method at remote locations. 2 refs.

Kopczewski, M.R.

1987-10-01T23:59:59.000Z

340

Methods for measuring turbine efficiency  

SciTech Connect

This article describes the most common methods used for measuring hydro turbine efficiency. These methods are the acoustic flowmeter method, the Gibson (pressure-time) method, pressure drop across a flow restriction, propeller-driven flowmeters, the volumetric method, Winter-Kennedy taps, and the thermodynamic method. A new computerized variation of the Gibson method is also described.

O'Kelly, F.

1992-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Method for synthesizing boracities  

DOE Patents (OSTI)

A method for producing boracites is disclosed in which a solution of divalent metal acetate, boric acid, and halogen acid is evaporated to dryness and the resulting solid is heated in an inert atmosphere under pressure.

Wolf, Gary A [Kennewick, WA

1982-01-01T23:59:59.000Z

342

Semiparametric Methods and Applications  

E-Print Network (OSTI)

theoretical semiparametric methods, we study the dynamic effectiveness of marketing mix variables and the competition among the pioneer and early followers in pharmaceutical industry. With two pharmaceutical categories data, we find dynamic effectiveness...

Lin, Zhongjian

2014-05-02T23:59:59.000Z

343

Entropic lattice Boltzmann methods  

Science Journals Connector (OSTI)

...research-article Research Article Entropic lattice Boltzmann methods Bruce M Boghosian 1...methodology for constructing lattice Boltzmann models of hydrodynamics with...visualizing the state-space of lattice Boltzmann algorithms that conserve a given...

2001-01-01T23:59:59.000Z

344

Subcell Remapping Method  

National Nuclear Security Administration (NNSA)

Subcell Subcell Remapping Method on Staggered Polygonal Grids for Arbitrary Lagrangian-Eulerian Methods Mikhail Shashkov T-7, LANL, shashkov@lanl.gov webpage: cnls.lanl.gov/∼ shashkov Raphael Loubere, T-7, LANL This work was performed under the auspices of the US Department of Energy at Los Alamos National Laboratory, under contract W-7405-ENG-36. The authors acknowledge the partial support of the ASC-ASCI Program at LANL and MICS DOE/ASCR Program in the Applied Mathematical Sciences 1 Outline * Arbitrary Lagrangian-Eulerian (ALE) Methods * Lagrangian Stage - Discretization, Subcell forces, Artificial Viscosity * Rezone Stage - Reference Jacobian Strategy, Untangling * Staggered Remap - Statement, Requirements and Main Stages - Gathering Stage - Subcell Remapping Stage - Scattering Stage - Numerical Examples * References 2 Arbitrary Lagrangian-Eulerian (ALE) Methods

345

Combined construction method  

Science Journals Connector (OSTI)

When selecting the optimal scheme of performing earthworks with volumes exceeding 800, 000 m3, it is revommended to consider the use of the combined methods. This is especially necessary in those cases when the u...

B. M. Shkundin

1987-10-01T23:59:59.000Z

346

Method of saccharifying cellulose  

DOE Patents (OSTI)

A method of saccharifying cellulose by incubation with the cellulase of Clostridium thermocellum in a broth containing an efficacious amount of a reducing agent. Other incubation parameters which may be advantageously controlled to stimulate saccharification include the concentration of alkaline earth salts, pH, temperature, and duration. By the method of the invention, even native crystalline cellulose such as that found in cotton may be completely saccharified.

Johnson, Eric A. (Brookline, MA); Demain, Arnold L. (Wellesley, MA); Madia, Ashwin (Decatur, IL)

1985-09-10T23:59:59.000Z

347

Method of saccharifying cellulose  

DOE Patents (OSTI)

A method is disclosed of saccharifying cellulose by incubation with the cellulase of Clostridium thermocellum in a broth containing an efficacious amount of thiol reducing agent. Other incubation parameters which may be advantageously controlled to stimulate saccharification include the concentration of alkaline earth salts, pH, temperature, and duration. By the method of the invention, even native crystalline cellulose such as that found in cotton may be completely saccharified.

Johnson, E.A.; Demain, A.L.; Madia, A.

1983-05-13T23:59:59.000Z

348

Geophysical Methods | Open Energy Information  

Open Energy Info (EERE)

Geophysical Methods Geophysical Methods Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Geophysical Methods Details Activities (0) Areas (0) Regions (0) NEPA(1) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Geophysical Techniques Parent Exploration Technique: Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Thermal: Dictionary.png Geophysical Methods: Methods used to measure the physical properties of the earth Other definitions:Wikipedia Reegle Introduction There are five main types of geophysical methods used for geothermal resource discovery: Seismic Methods (active and passive) Electrical Methods Magnetic Methods Gravity Methods Radiometric Methods Seismic methods dominates oil and gas exploration, and probably accounts

349

Combining multiple FDG-PET radiotherapy target segmentation methods to reduce the effect of variable performance of individual segmentation methods  

SciTech Connect

Purpose: Many approaches have been proposed to segment high uptake objects in 18F-fluoro-deoxy-glucose positron emission tomography images but none provides consistent performance across the large variety of imaging situations. This study investigates the use of two methods of combining individual segmentation methods to reduce the impact of inconsistent performance of the individual methods: simple majority voting and probabilistic estimation. Methods: The National Electrical Manufacturers Association image quality phantom containing five glass spheres with diameters 13-37 mm and two irregularly shaped volumes (16 and 32 cc) formed by deforming high-density polyethylene bottles in a hot water bath were filled with 18-fluoro-deoxyglucose and iodine contrast agent. Repeated 5-min positron emission tomography (PET) images were acquired at 4:1 and 8:1 object-to-background contrasts for spherical objects and 4.5:1 and 9:1 for irregular objects. Five individual methods were used to segment each object: 40% thresholding, adaptive thresholding, k-means clustering, seeded region-growing, and a gradient based method. Volumes were combined using a majority vote (MJV) or Simultaneous Truth And Performance Level Estimate (STAPLE) method. Accuracy of segmentations relative to CT ground truth volumes were assessed using the Dice similarity coefficient (DSC) and the symmetric mean absolute surface distances (SMASDs). Results: MJV had median DSC values of 0.886 and 0.875; and SMASD of 0.52 and 0.71 mm for spheres and irregular shapes, respectively. STAPLE provided similar results with median DSC of 0.886 and 0.871; and median SMASD of 0.50 and 0.72 mm for spheres and irregular shapes, respectively. STAPLE had significantly higher DSC and lower SMASD values than MJV for spheres (DSC, p < 0.0001; SMASD, p= 0.0101) but MJV had significantly higher DSC and lower SMASD values compared to STAPLE for irregular shapes (DSC, p < 0.0001; SMASD, p= 0.0027). DSC was not significantly different between 128 Multiplication-Sign 128 and 256 Multiplication-Sign 256 grid sizes for either method (MJV, p= 0.0519; STAPLE, p= 0.5672) but was for SMASD values (MJV, p < 0.0001; STAPLE, p= 0.0164). The best individual method varied depending on object characteristics. However, both MJV and STAPLE provided essentially equivalent accuracy to using the best independent method in every situation, with mean differences in DSC of 0.01-0.03, and 0.05-0.12 mm for SMASD. Conclusions: Combining segmentations offers a robust approach to object segmentation in PET. Both MJV and STAPLE improved accuracy and were robust against the widely varying performance of individual segmentation methods. Differences between MJV and STAPLE are such that either offers good performance when combining volumes. Neither method requires a training dataset but MJV is simpler to interpret, easy to implement and fast.

McGurk, Ross J. [Medical Physics Graduate Program, Duke University, Durham, North Carolina 27705 (United States); Bowsher, James; Das, Shiva K. [Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina 27705 (United States); Lee, John A [Molecular Imaging and Experimental Radiotherapy Unit, Universite Catholique de Louvain, 1200 Brussels (Belgium)

2013-04-15T23:59:59.000Z

350

Methods | Transparent Cost Database  

Open Energy Info (EERE)

Methods Methods Disclaimer The data gathered here are for informational purposes only. Inclusion of a report in the database does not represent approval of the estimates by DOE or NREL. Levelized cost calculations DO NOT represent real world market conditions. The calculation uses a single discount rate in order to compare technology costs only. About the Cost Database For emerging energy technologies, a variety of cost and performance numbers are cited in presentations and reports for present-day characteristics and potential improvements. Amid a variety of sources and methods for these data, the Office of Energy Efficiency and Renewable Energy's technology development programs determine estimates for use in program planning. The Transparent Cost Database collects program cost and performance

351

Methods of forming steel  

DOE Patents (OSTI)

In one aspect, the invention encompasses a method of forming a steel. A metallic glass is formed and at least a portion of the glass is converted to a crystalline steel material having a nanocrystalline scale grain size. In another aspect, the invention encompasses another method of forming a steel. A molten alloy is formed and cooled the alloy at a rate which forms a metallic glass. The metallic glass is devitrified to convert the glass to a crystalline steel material having a nanocrystalline scale grain size. In yet another aspect, the invention encompasses another method of forming a steel. A first metallic glass steel substrate is provided, and a molten alloy is formed over the first metallic glass steel substrate to heat and devitrify at least some of the underlying metallic glass of the substrate.

Branagan, Daniel J. (Iona, ID); Burch, Joseph V. (Shelley, ID)

2001-01-01T23:59:59.000Z

352

Unorthodox theoretical methods  

SciTech Connect

The use of the ReaxFF force field to correlate with NMR mobilities of amine catalytic substituents on a mesoporous silica nanosphere surface is considered. The interfacing of the ReaxFF force field within the Surface Integrated Molecular Orbital/Molecular Mechanics (SIMOMM) method, in order to replicate earlier SIMOMM published data and to compare with the ReaxFF data, is discussed. The development of a new correlation consistent Composite Approach (ccCA) is presented, which incorporates the completely renormalized coupled cluster method with singles, doubles and non-iterative triples corrections towards the determination of heats of formations and reaction pathways which contain biradical species.

Nedd, Sean

2012-06-20T23:59:59.000Z

353

The Use of Decision Threshold Adjustment in Classification for Cancer Prediction James J. Chen1, Chen-An Tsai2, Hojin Moon1, Hongshik Ahn3, John J. Young1,  

E-Print Network (OSTI)

The Use of Decision Threshold Adjustment in Classification for Cancer Prediction James J. Chen1 #12;INTRODUCTION Classification/prediction (machine learning) has been a widely used data mining technique in many areas of research and applications. Class prediction has been used to predict the activity

Ahn, Hongshik

354

UNCORRECTED TRIBOLOGY METHODS1  

E-Print Network (OSTI)

UNCORRECTED PROOF TRIBOLOGY METHODS1 2 Uncertainty in Pin-on-Disk Wear Volume Measurements Using 3 Surface Scanning Techniques 4 R. S. Colbert · B. A. Krick · A. C. Dunn · 5 J. R. Vail · N. Argibay · W. G 2010 8 Abstract The uncertainty of wear volumes measured 9 using surface scanning techniques is often

Sawyer, Wallace

355

Sampling system and method  

DOE Patents (OSTI)

The present disclosure provides an apparatus and method for coupling conduit segments together. A first pump obtains a sample and transmits it through a first conduit to a reservoir accessible by a second pump. The second pump further conducts the sample from the reservoir through a second conduit.

Decker, David L.; Lyles, Brad F.; Purcell, Richard G.; Hershey, Ronald Lee

2013-04-16T23:59:59.000Z

356

Solar Energy Storage Methods  

Science Journals Connector (OSTI)

Solar Energy Storage Methods ... Conducting polymers have superior specific energies to the carbon-based supercapacitors and have greater power capability, compared to inorganic battery material. ... The question of load redistribution for better energetic usage is of vital importance since these new renewable energy sources are often intermittent. ...

Yu Hou; Ruxandra Vidu; Pieter Stroeve

2011-06-09T23:59:59.000Z

357

INTRODUCTION CURRENT METHODS  

E-Print Network (OSTI)

membrane, leaving salt and contaminants behind. Another common method of desalination is vacuum distillation, in which water is separated from salt and other contaminants based on the fact that water and leave behind the brine from the salt water, thereby purifying potable water. Presently, the major

Auerbach, Scott M.

358

Biomass treatment method  

DOE Patents (OSTI)

A method for treating biomass was developed that uses an apparatus which moves a biomass and dilute aqueous ammonia mixture through reaction chambers without compaction. The apparatus moves the biomass using a non-compressing piston. The resulting treated biomass is saccharified to produce fermentable sugars.

Friend, Julie (Claymont, DE); Elander, Richard T. (Evergreen, CO); Tucker, III; Melvin P. (Lakewood, CO); Lyons, Robert C. (Arvada, CO)

2010-10-26T23:59:59.000Z

359

RECENT ADVANCES COMPUTATIONAL METHODS  

E-Print Network (OSTI)

RECENT ADVANCES ON COMPUTATIONAL METHODS FOR STRUCTURED INVERSE QUADRATIC EIGENVALUE PROBLEMS by Biswa Nath Datta Department of Mathematical Sciences Northern Illinois University DeKalb, IL 60115 E-Element Model Updating in Aerospace and Au- tomobile Industries. 10 #12;Quadratic Inverse Eigenvalue Problems

Datta, Biswa

360

Heart imaging method  

DOE Patents (OSTI)

A method for providing an image of the human heart's electrical system derives time-of-flight data from an array of EKG electrodes and this data is transformed into phase information. The phase information, treated as a hologram, is reconstructed to provide an image in one or two dimensions of the electrical system of the functioning heart.

Collins, H. Dale (Richland, WA); Gribble, R. Parks (Richland, WA); Busse, Lawrence J. (Littleton, CO)

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Hydrogen and fluorine migration in photo-double-ionization of 1,1-difluoroethylene (1,1-C2H2F2) near and above threshold  

Science Journals Connector (OSTI)

We have studied the nondissociative and dissociative photo-double-ionization of 1,1-difluoroethylene using single photons of energies ranging from 40 to 70 eV. Applying a coincident electron-ion three-dimensional momentum imaging technique, kinematically complete measurements have been achieved. We present the branching ratios of the six reaction channels identified in the experiment. Electron-ion energy maps and relative electron emission angles are used to distinguish between direct and indirect photo-double-ionization mechanisms at a few different photon energies. The influence of selection and propensity rules is discussed. Threshold energies of double ionization are extracted from the sum of the kinetic energies of the electrons, which hint to the involvement of different manifolds of states. The dissociative ionization channels with two ionic fragments are explored in detail by measuring the kinetic energy release of the fragment ions, sum of the kinetic energies, as well as the energy sharing of the two emitted electrons. We investigate the migration of hydrogen and fluorine atoms and compare the experimental results to the photo-double-ionization of centrosymmetric linear and planar hydrocarbons (C2H2 and C2H4) whenever possible.

B. Gaire; I. Bocharova; F. P. Sturm; N. Gehrken; J. Rist; H. Sann; M. Kunitski; J. Williams; M. S. Schöffler; T. Jahnke; B. Berry; M. Zohrabi; M. Keiling; A. Moradmand; A. L. Landers; A. Belkacem; R. Dörner; I. Ben-Itzhak; Th. Weber

2014-04-21T23:59:59.000Z

362

Trend of tunnel magnetoresistance and variation in threshold voltage for keeping data load robustness of metal–oxide–semiconductor/magnetic tunnel junction hybrid latches  

Science Journals Connector (OSTI)

The robustness of data load of metal–oxide–semiconductor/magnetic tunnel junction (MOS/MTJ) hybrid latches at power-on is examined by using Monte Carlo simulation with the variations in magnetoresistances for MTJs and in threshold voltages for MOSFETs involved in 90?nm technology node. Three differential pair type spin-transfer-torque-magnetic random access memory cells (4T2MTJ 6T2MTJ and 8T2MTJ) are compared for their successful data load at power-on. It is found that the 4T2MTJ cell has the largest pass area in the shmoo plot in TMR ratio (tunnel magnetoresistance ratio) and Vdd in which a whole 256?kb cell array can be powered-on successfully. The minimum TMR ratio for the 4T2MTJ in 0.9?V?

S. Ikeda; T. Hanyu; H. Ohno

2014-01-01T23:59:59.000Z

363

The Regulation of Cooling and Star Formation in Luminous Galaxies by AGN Feedback and the Cooling-Time/Entropy Threshold for the Onset of Star Formation  

E-Print Network (OSTI)

Using broadband optical imaging and Chandra X-ray data for a sample of 46 cluster central dominant galaxies (CDGs), we investigate the connection between star formation, the intracluster medium (ICM), and the central active galactic nucleus (AGN). We report the discovery of a remarkably sharp threshold for the onset of star formation that occurs when the central cooling time of the hot atmosphere falls below ~ 5x10^8 yr, or equivalently when the central entropy falls below ~ 30 keV cm^2. In addition to this criterion, star formation in cooling flows also appears to require that the X-ray and galaxy centroids lie within ~ 20 kpc of each other, and that the jet (cavity) power is smaller than the X-ray cooling luminosity. These three criteria, together with the high ratio of cooling time to AGN outburst (cavity) age across our sample, directly link the presence of star formation and AGN activity in CDGs to cooling instabilities in the intracluster plasma. Our results provide compelling evidence that AGN feedback into the hot ICM is largely responsible for regulating cooling and star formation in the cores of clusters, leading to the significant growth of supermassive black holes in CDGs at late times.

David Rafferty; Brian McNamara; Paul Nulsen

2008-02-13T23:59:59.000Z

364

Accelerated Molecular Dynamics Methods  

NLE Websites -- All DOE Office Websites (Extended Search)

Dynamics Methods Dynamics Methods for Infrequent Events Arthur F. Voter Theoretical Division Los Alamos National Laboratory Los Alamos, New Mexico U.S. Department of Energy Theory Focus Session on Hydrogen Storage Materials Crystal City, VA May 18, 2006 Los Alamos Acknowledgments Blas P. Uberuaga (LANL, MST-8) Francesco Montalenti (U. Milano-Bicocca) Graeme Henkelman (U. Texas at Austin) Timothy C. Germann (LANL, X-7) James A. Sprague (NRL) Mads Sorensen (Novo Nordisk A/S, Copenhagen) Sriram Swaminarayan (LANL, MST-8) Steve Stuart (Clemson) David Sholl (Carnegie Mellon) John Hamilton (Sandia) Wolfgang Windl (Ohio State) Roger Smith (U. Loughborough) Robin Grimes (Imperial College) Kurt Sickafus (LANL, MST-8) Jacques Amar (U. Toledo) DOE Office of Basic Energy Sciences Motorola Intel Los Alamos Outline

365

Die singulation method  

DOE Patents (OSTI)

A method is disclosed for singulating die from a semiconductor substrate (e.g. a semiconductor-on-insulator substrate or a bulk silicon substrate) containing an oxide layer (e.g. silicon dioxide or a silicate glass) and one or more semiconductor layers (e.g. monocrystalline or polycrystalline silicon) located above the oxide layer. The method etches trenches through the substrate and through each semiconductor layer about the die being singulated, with the trenches being offset from each other around at least a part of the die so that the oxide layer between the trenches holds the substrate and die together. The trenches can be anisotropically etched using a Deep Reactive Ion Etching (DRIE) process. After the trenches are etched, the oxide layer between the trenches can be etched away with a HF etchant to singulate the die. A release fixture can be located near one side of the substrate to receive the singulated die.

Swiler, Thomas P [Albuquerque, NM; Garcia, Ernest J [Albuquerque, NM; Francis, Kathryn M [Rio Rancho, NM

2014-01-07T23:59:59.000Z

366

Cold isopressing method  

DOE Patents (OSTI)

A cold isopressing method in which two or more layers of material are formed within an isopressing mold. One of the layers consists of a tape-cast film. The layers are isopressed within the isopressing mold, thereby to laminate the layers and to compact the tape-cast film. The isopressing mold can be of cylindrical configuration with the layers being coaxial cylindrical layers. The materials used in forming the layers can contain green ceramic materials and the resultant structure can be fired and sintered as necessary and in accordance with known methods to produce a finished composite, ceramic structure. Further, such green ceramic materials can be of the type that are capable of conducting hydrogen or oxygen ions at high temperature with the object of utilizing the finished composite ceramic structure as a ceramic membrane element.

Chen, Jack C. (Getzville, NY); Stawisuck, Valerie M. (North Tonawanda, NY); Prasad, Ravi (East Amherst, NY)

2003-01-01T23:59:59.000Z

367

Vapor spill monitoring method  

DOE Patents (OSTI)

Method for continuous sampling of liquified natural gas effluent from a spill pipe, vaporizing the cold liquified natural gas, and feeding the vaporized gas into an infrared detector to measure the gas composition. The apparatus utilizes a probe having an inner channel for receiving samples of liquified natural gas and a surrounding water jacket through which warm water is flowed to flash vaporize the liquified natural gas.

Bianchini, Gregory M. (Livermore, CA); McRae, Thomas G. (Livermore, CA)

1985-01-01T23:59:59.000Z

368

Parametric Lattice Boltzmann Method  

E-Print Network (OSTI)

The discretized equilibrium distributions of the lattice Boltzmann method are presented by using the coefficients of the Lagrange interpolating polynomials that pass through the points related to discrete velocities and using moments of the Maxwell-Boltzmann distribution. The ranges of flow velocity and temperature providing positive valued distributions vary with regulating discrete velocities as parameters. In addition, thermal flows are simulated by only five on-lattice discrete velocities and the distributions upon asymmetric sets of discrete velocities are introduced.

Shim, Jae Wan

2014-01-01T23:59:59.000Z

369

Consistent Lattice Boltzmann Method  

Science Journals Connector (OSTI)

Lack of energy conservation in lattice Boltzmann models leads to unrealistically high values of the bulk viscosity. For this reason, the lattice Boltzmann method remains a computational tool rather than a model of a fluid. A novel lattice Boltzmann model with energy conservation is derived from Boltzmann’s kinetic theory. Simulations demonstrate that the new lattice Boltzmann model is the valid approximation of the Boltzmann equation for weakly compressible flows and microflows.

Santosh Ansumali and Iliya V. Karlin

2005-12-29T23:59:59.000Z

370

Course description Mathematical Methods  

E-Print Network (OSTI)

. The method of characteristics. 7 Second-order PDE in two variables. Separation of variables for the heat Grading Outline References References Course slides will be posted on the intranet before each session.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-241Fall2003/CourseHome/ Separate chapters will be also posted on the intranet. BL S. Boyd and S

Batlle, Carles

371

Method for detecting biomolecules  

DOE Patents (OSTI)

A method for detecting and measuring the concentration of biomolecules in solution, utilizing a conducting electrode in contact with a solution containing target biomolecules, with a film with controllable pore size distribution characteristics applied to at least one surface of the conducting electrode. The film is functionalized with probe molecules that chemically interact with the target biomolecules at the film surface, blocking indicator molecules present in solution from diffusing from the solution to the electrode, thereby changing the electrochemical response of the electrode

Huo, Qisheng (Albuquerque, NM); Liu, Jun (Albuquerque, NM)

2008-08-12T23:59:59.000Z

372

Innovative sludge stabilization method  

SciTech Connect

Sludge is generated in many water and wastewater treatment processes, both biological and physical/chemical. Examples include biological sludges from sanitary and industrial wastewater treatment operations and chemical sludges such as those produced when metals are removed from metal plating wastewater. Even some potable water plants produce sludge, such as when alum is used as a flocculating agent to clarify turbid water. Because sludge is produced from such a variety of operations, different techniques have been developed to remove water from sludges and reduce the sludge volume and mass, thus making the sludge more suitable for recovery or disposal. These techniques include mechanical (e.g., filter presses), solar (sludge drying beds), and thermal. The least expensive of these methods, neglecting land costs, involves sludge drying beds and lagoons. The solar method was widely used in sewage treatment plants for many years, but has fallen in disfavor in the US; mechanical and thermal methods have been preferred. Since environmental remediation often requires managing sludges, this article presents a discussion of a variation of sludge lagoons known as evaporative sludge stabilization. Application of this process to the closure of two 2.5 acre (10117 m{sup 2}) hazardous waste surface impoundments will be discussed. 1 ref., 2 figs.

Riggenbach, J.D.

1995-06-01T23:59:59.000Z

373

Multiphoton above-threshold detachment of Li-: Exterior-complex-scaling– generalized-pseudospectral method for calculations of complex-quasienergy resonances in Floquet formulation of time-dependent density-functional theory  

E-Print Network (OSTI)

-independent non-Hermitian Floquet matrix eigen- value problem @19–22#. Such a TDDFT-Floquet formalism provides a general time-independent approach for nonpertur- bative treatment of multiphoton processes of many-electron quantum systems in periodic, quasiperiodic... state for the eigen- value problem. Accordingly, there is no concept of the initial state in the Floquet formulation of TDDFT. The Floquet states are the eigenstates of the Hermitian operator Hˆ in the extended Hilbert space S. In this respect, Floquet...

Telnov, Dmitry A.; Chu, Shih-I

2002-10-25T23:59:59.000Z

374

Method for FractMethod for Fracture Detection Using Multicomponent...  

NLE Websites -- All DOE Office Websites (Extended Search)

Method for FractMethod for Fracture Detection Using Multicomponent Seismic Dataure Detection Using Multicomponent Seismic Data Dr. Bryan DeVault Department of Geophysics Colorado...

375

Asymptotic method for determining the amplitude for three-particle breakup: Neutron-deuteron scattering  

SciTech Connect

The process of neutron-deuteron scattering at energies above the deuteron-breakup threshold is described within the three-body formalism of Faddeev equations. Use is made of the method of solving Faddeev equations in configuration space on the basis of expanding wave-function components in the asymptotic region in bases of eigenfunctions of specially chosen operators. Asymptotically, wave-function components are represented in the form of an expansion in an orthonormalized basis of functions depending on the hyperangle. This basis makes it possible to orthogonalize the contributions of elastic-scattering and breakup channels. The proposed method permits determining scattering and breakup parameters from the asymptotic representation of the wave function without reconstructing it over the entire configuration space. The scattering and breakup amplitudes for states of total spin S = 1/2 and 3/2 were obtained for the s-wave Faddeev equation.

Belov, P. A., E-mail: pavelbelov@gmail.com; Yakovlev, S. L., E-mail: yakovlev@cph10.phys.spbu.ru [St. Petersburg State University, Department of Computational Physics (Russian Federation)

2013-02-15T23:59:59.000Z

376

Imaging sunspots using helioseismic methods  

Science Journals Connector (OSTI)

...poorly understood areas in solar physics. Imaging local anomalous...sunspots and the surrounding solar active regions. By highlighting...Interpretation, Computer-Assisted methods Oscillometry methods Rheology methods Solar Activity Solar System Vibration

2005-01-01T23:59:59.000Z

377

The Higgs Portal Above Threshold  

E-Print Network (OSTI)

The discovery of the Higgs boson opens the door to new physics interacting via the Higgs Portal, including motivated scenarios relating to baryogenesis, dark matter, and electroweak naturalness. We systematically explore the collider signatures of singlet scalars produced via the Higgs Portal at the 14 TeV LHC and a prospective 100 TeV hadron collider. We focus on the challenging regime where the scalars are too heavy to be produced in the decays of an on-shell Higgs boson, and instead are produced primarily via an off-shell Higgs. Assuming these scalars escape the detector, promising channels include missing energy in association with vector boson fusion, monojets, and top pairs. We forecast the sensitivity of searches in these channels at $\\sqrt{s} = 14$ & 100 TeV and compare collider reach to the motivated parameter space of singlet-assisted electroweak baryogenesis, Higgs Portal dark matter, and neutral naturalness.

Nathaniel Craig; Hou Keong Lou; Matthew McCullough; Arun Thalapillil

2014-11-30T23:59:59.000Z

378

The Higgs Portal Above Threshold  

E-Print Network (OSTI)

The discovery of the Higgs boson opens the door to new physics interacting via the Higgs Portal, including motivated scenarios relating to baryogenesis, dark matter, and electroweak naturalness. We systematically explore the collider signatures of singlet scalars produced via the Higgs Portal at the 14 TeV LHC and a prospective 100 TeV hadron collider. We focus on the challenging regime where the scalars are too heavy to be produced in the decays of an on-shell Higgs boson, and instead are produced primarily via an off-shell Higgs. Assuming these scalars escape the detector, promising channels include missing energy in association with vector boson fusion, monojets, and top pairs. We forecast the sensitivity of searches in these channels at $\\sqrt{s} = 14$ & 100 TeV and compare collider reach to the motivated parameter space of singlet-assisted electroweak baryogenesis, Higgs Portal dark matter, and neutral naturalness.

Craig, Nathaniel; McCullough, Matthew; Thalapillil, Arun

2014-01-01T23:59:59.000Z

379

Method of drying articles  

DOE Patents (OSTI)

A method of drying a green particulate article includes the steps of: a. Providing a green article which includes a particulate material and a pore phase material, the pore phase material including a solvent; and b. contacting the green article with a liquid desiccant for a period of time sufficient to remove at least a portion of the solvent from the green article, the pore phase material acting as a semipermeable barrier to allow the solvent to be sorbed into the liquid desiccant, the pore phase material substantially preventing the liquid desiccant from entering the pores.

Janney, Mark A. (Knoxville, TN); Kiggans, Jr., James O. (Oak Ridge, TN)

1999-01-01T23:59:59.000Z

380

Control system design method  

DOE Patents (OSTI)

A control system design method and concomitant control system comprising representing a physical apparatus to be controlled as a Hamiltonian system, determining elements of the Hamiltonian system representation which are power generators, power dissipators, and power storage devices, analyzing stability and performance of the Hamiltonian system based on the results of the determining step and determining necessary and sufficient conditions for stability of the Hamiltonian system, creating a stable control system based on the results of the analyzing step, and employing the resulting control system to control the physical apparatus.

Wilson, David G. (Tijeras, NM); Robinett, III, Rush D. (Tijeras, NM)

2012-02-21T23:59:59.000Z

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Brush Management Methods  

E-Print Network (OSTI)

such junipers and deposition as oaks mesquite on sand- clay loams Grazon ET, Controls most species 5+ May temporarily in- Crossbow, except junipers and jure grasses in imme- Diesel lime pricklyash diate area of woody (basal bark plant, depending on application... vegetation caused by disking make the method most applicable to deep soils that can be seeded. Chaining Chaining is used to knock down and thin moderate to thick stands of brush (Figure 9). Chaining alone gives only temporary control. It is most effective...

Welch, Tommy G.

2000-07-14T23:59:59.000Z

382

Method of joining ceramics  

DOE Patents (OSTI)

According to the method of the present invention, joining a first bi-element carbide to a second bi-element carbide, has the steps of: (a) forming a bond agent containing a metal carbide and silicon; (b) placing the bond agent between the first and second bi-element carbides to form a pre-assembly; and (c) pressing and heating the pre-assembly in a non-oxidizing atmosphere to a temperature effective to induce a displacement reaction creating a metal silicon phase bonding the first and second bi-element carbides.

Henager, Jr., Charles H. (Kennewick, WA); Brimhall, John L. (West Richland, WA)

2000-01-01T23:59:59.000Z

383

Method of drying articles  

DOE Patents (OSTI)

A method of drying a green particulate article includes the steps of: (a) Providing a green article which includes a particulate material and a pore phase material, the pore phase material including a solvent; and (b) contacting the green article with a liquid desiccant for a period of time sufficient to remove at least a portion of the solvent from the green article, the pore phase material acting as a semipermeable barrier to allow the solvent to be sorbed into the liquid desiccant, the pore phase material substantially preventing the liquid desiccant from entering the pores. 3 figs.

Janney, M.A.; Kiggans, J.O. Jr.

1999-03-23T23:59:59.000Z

384

Method for resonant measurement  

DOE Patents (OSTI)

A method of measurement of objects to determine object flaws, Poisson's ratio (.sigma.) and shear modulus (.mu.) is shown and described. First, the frequency for expected degenerate responses is determined for one or more input frequencies and then splitting of degenerate resonant modes are observed to identify the presence of flaws in the object. Poisson's ratio and the shear modulus can be determined by identification of resonances dependent only on the shear modulus, and then using that shear modulus to find Poisson's ratio using other modes dependent on both the shear modulus and Poisson's ratio.

Rhodes, George W. (5201 Rio Grande Blvd., N.W., Albuquerque, NM 87107); Migliori, Albert (Rte. 4, Box 258 Tano Rd., Sante Fe, NM 87501); Dixon, Raymond D. (396 Connie Ave., White Rock, NM 87544)

1996-01-01T23:59:59.000Z

385

Methods of making monolayers  

DOE Patents (OSTI)

The invention pertains to methods of forming monolayers on various surfaces. The surfaces can be selected from a wide array of materials, including, for example, aluminum dioxide, silicon dioxide, carbon and SiC. The substrates can be planar or porous. The monolayer is formed under enhanced pressure conditions. The monolayer contains functionalized molecules, and accordingly functionalizes a surface of the substrate. The properties of the functionalized substrate can enhance the substrate's applicability for numerous purposes including, for example, utilization in extracting contaminants, or incorporation into a polymeric matrix.

Alford, Kentin L. (Pasco, WA); Simmons, Kevin L. (Kennewick, WA); Samuels, William D. (Richland, WA); Zemanian, Thomas S. (Richland, WA); Liu, Jun (Albuquerque, NM); Shin, Yongsoon (Richland, WA); Fryxell, Glen E. (Kennewick, WA)

2009-12-08T23:59:59.000Z

386

Method for welding beryllium  

DOE Patents (OSTI)

A method is provided for joining beryllium pieces which comprises: depositing aluminum alloy on at least one beryllium surface; contacting that beryllium surface with at least one other beryllium surface; and welding the aluminum alloy coated beryllium surfaces together. The aluminum alloy may be deposited on the beryllium using gas metal arc welding. The aluminum alloy coated beryllium surfaces may be subjected to elevated temperatures and pressures to reduce porosity before welding the pieces together. The aluminum alloy coated beryllium surfaces may be machined into a desired welding joint configuration before welding. The beryllium may be an alloy of beryllium or a beryllium compound. The aluminum alloy may comprise aluminum and silicon.

Dixon, Raymond D. (Los Alamos, NM); Smith, Frank M. (Espanola, NM); O'Leary, Richard F. (Los Alamos, NM)

1997-01-01T23:59:59.000Z

387

Method for producing superconductors  

SciTech Connect

A method for producing a V3Al superconductor is disclosed which comprises making a composite composed of a sheath portion of a copper alloy containing 1 to 15 atomic percent of germanium, 1 to 15 atomic percent of silicon or 2 to 25 atomic percent of gallium and surrounded by the sheath portion, at least one core portion of a vanadium-aluminum alloy containing 0.5 to 20 atomic percent of aluminum; elongating the composite; and then heat-treating the elongated composite thereby to form a V3(Al, Ge), V3(Al, Si) or V3(Al, Ga) layer between the sheath portion and the core portion.

Inoue, K.; Tachikawa, K.; Togano, K.

1982-03-30T23:59:59.000Z

388

About the Uniform Methods Project  

Office of Energy Efficiency and Renewable Energy (EERE)

The Uniform Methods Project is developing Methods for Determining Energy Efficiency Savings for Specific Measures through collaboration with energy efficiency program administrators, stakeholders,...

389

Combining building thermal simulation methods and LCA methods  

E-Print Network (OSTI)

- 1 - Combining building thermal simulation methods and LCA methods Frank Pedersen, Researcher assessment (LCA) method into a whole building hygro-thermal simulation tool. The motivation for the work of buildings (CEN/TC 350). Combining LCA methods with hygro-thermal simulation tools enables designers

Hansen, René Rydhof

390

Nucleic acid detection methods  

DOE Patents (OSTI)

The invention relates to methods for rapidly determining the sequence and/or length a target sequence. The target sequence may be a series of known or unknown repeat sequences which are hybridized to an array of probes. The hybridized array is digested with a single-strand nuclease and free 3{prime}-hydroxyl groups extended with a nucleic acid polymerase. Nuclease cleaved heteroduplexes can be easily distinguish from nuclease uncleaved heteroduplexes by differential labeling. Probes and target can be differentially labeled with detectable labels. Matched target can be detected by cleaving resulting loops from the hybridized target and creating free 3-hydroxyl groups. These groups are recognized and extended by polymerases added into the reaction system which also adds or releases one label into solution. Analysis of the resulting products using either solid phase or solution. These methods can be used to detect characteristic nucleic acid sequences, to determine target sequence and to screen for genetic defects and disorders. Assays can be conducted on solid surfaces allowing for multiple reactions to be conducted in parallel and, if desired, automated. 18 figs.

Smith, C.L.; Yaar, R.; Szafranski, P.; Cantor, C.R.

1998-05-19T23:59:59.000Z

391

New {sup 34}Cl proton-threshold states and the thermonuclear {sup 33}S(p,{gamma}){sup 34}Cl rate in ONe novae  

SciTech Connect

Analysis of presolar grains in primitive meteorites has shown isotopic ratios largely characteristic of the conditions thought to prevail in various astrophysical environments. A possible indicator for a grain of ONe nova origin is a large {sup 33}S abundance: nucleosynthesis calculations predict as much as 150 times the solar abundance of {sup 33}S in the ejecta of nova explosions on massive ONe white dwarfs. This overproduction factor may, however, vary by factors of at least 0.01-3 because of uncertainties of several orders of magnitude in the {sup 33}S(p,{gamma}){sup 34}Cl reaction rate at nova peak temperatures (T{sub peak}{approx}0.1-0.4 GK). These uncertainties arise due to the lack of nuclear physics information for states within {approx}600 keV of the {sup 33}S+p threshold in {sup 34}Cl (S{sub p}({sup 34}Cl) = 5143 keV). To better constrain this rate we have measured, for the first time, the {sup 34}S({sup 3}He,t){sup 34}Cl reaction over the region E{sub x}({sup 34}Cl) = 4.9-6 MeV. We confirm previous states and find 15 new states in this energy region. New {sup 33}S(p,{gamma}){sup 34}Cl resonances at E{sub R}=281(2), 301(2), and 342(2) keV may dominate this rate at relevant nova temperatures. Our results could affect predictions of sulphur isotopic ratios in nova ejecta (e.g., {sup 32}S/{sup 33}S) that may be used as diagnostic tools for the nova paternity of grains.

Parikh, A.; Faestermann, T.; Kruecken, R.; Behrens, T.; Bildstein, V.; Bishop, S.; Eppinger, K.; Herlitzius, C.; Hinke, C.; Schlarb, M.; Seiler, D.; Wimmer, K. [Physik Department E12, Technische Universitaet Muenchen, D-85748 Garching (Germany); Maier-Leibnitz-Laboratorium der Muenchner Universitaeten (MLL), D-85748 Garching (Germany); Hertenberger, R.; Wirth, H.-F. [Maier-Leibnitz-Laboratorium der Muenchner Universitaeten (MLL), D-85748 Garching (Germany); Fakultaet fuer Physik, Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching (Germany); Schafstadler, D. [Physik Department E12, Technische Universitaet Muenchen, D-85748 Garching (Germany)

2009-07-15T23:59:59.000Z

392

New 34Cl proton-threshold states and the thermonuclear 33S(p,gamma)34Cl rate in ONe novae  

E-Print Network (OSTI)

Analysis of presolar grains in primitive meteorites has shown isotopic ratios largely characteristic of the conditions thought to prevail in various astrophysical environments. A possible indicator for a grain of ONe nova origin is a large 33S abundance: nucleosynthesis calculations predict as much as 150 times the solar abundance of 33S in the ejecta of nova explosions on massive ONe white dwarfs. This overproduction factor may, however, vary by factors of at least 0.01 - 3 because of uncertainties of several orders of magnitude in the 33S(p,gamma)34Cl reaction rate at nova peak temperatures (Tpeak ~ 0.1 - 0.4 GK). These uncertainties arise due to the lack of nuclear physics information for states within ~ 600 keV of the 33S+p threshold in 34Cl (Sp(34Cl) = 5143 keV). To better constrain this rate we have measured, for the first time, the 34S(3He,t)34Cl reaction over the region Ex(34Cl) = 4.9 - 6 MeV. We confirm previous states and find 15 new states in this energy region. New 33S(p,gamma)34Cl resonances at ER = 281(2), 301(2) and 342(2) keV may dominate this rate at relevant nova temperatures. Our results could affect predictions of sulphur isotopic ratios in nova ejecta (e.g., 32S/33S) that may be used as diagnostic tools for the nova paternity of grains.

A. Parikh; T. Faestermann; R. Hertenberger; R. Kruecken; D. Schafstadler; H. -F. Wirth; T. Behrens; V. Bildstein; S. Bishop; K. Eppinger; C. Herlitzius; C. Hinke; M. Schlarb; D. Seiler; K. Wimmer

2009-06-19T23:59:59.000Z

393

Novel method for hit-position reconstruction using voltage signals in plastic scintillators and its application to Positron Emission Tomography  

E-Print Network (OSTI)

Currently inorganic scintillator detectors are used in all commercial Time of Flight Positron Emission Tomograph (TOF-PET) devices. The J-PET collaboration investigates a possibility of construction of a PET scanner from plastic scintillators which would allow for single bed imaging of the whole human body. This paper describes a novel method of hit-position reconstruction based on sampled signals and an example of an application of the method for a single module with a 30 cm long plastic strip, read out on both ends by Hamamatsu R4998 photomultipliers. The sampling scheme to generate a vector with samples of a PET event waveform with respect to four user-defined amplitudes is introduced. The experimental setup provides irradiation of a chosen position in the plastic scintillator strip with an annihilation gamma quanta of energy 511~keV. The statistical test for a multivariate normal (MVN) distribution of measured vectors at a given position is developed, and it is shown that signals sampled at four thresholds in a voltage domain are approximately normally distributed variables. With the presented method of a vector analysis made out of waveform samples acquired with four thresholds, we obtain a spatial resolution of about 1 cm and a timing resolution of about 80 ps

L. Raczynski; P. Moskal; P. Kowalski; W. Wislicki; T. Bednarski; P. Bialas; E. Czerwinski; L . Kaplon; A. Kochanowski; G. Korcyl; J. Kowal; T. Kozik; W. Krzemien; E. Kubicz; M. Molenda; I. Moskal; Sz. Niedzwiecki; M. Palka; M. Pawlik-Niedzwiecka; Z. Rudy; P. Salabura; N. G. Sharma; M. Silarski; A. Slomski; J. Smyrski; A. Strzelecki; A. Wieczorek; M. Zielinski; N. Zon

2014-07-31T23:59:59.000Z

394

BEGIN VCALENDAR METHOD PUBLISH  

NLE Websites -- All DOE Office Websites (Extended Search)

BEGIN VCALENDAR BEGIN VCALENDAR METHOD PUBLISH PRODID aps anl gov NONSGML iCalcreator VERSION X WR TIMEZONE America Chicago BEGIN VEVENT UID T152245CST wfNso0 aps anl gov DTSTAMP T212245Z DESCRIPTION DTEND TZID America Chicago T130000 DTSTART TZID America Chicago T120000 LOCATION A1100 SUMMARY User Science Seminar resumes END VEVENT BEGIN VEVENT UID T152245CST bNeb1D aps anl gov DTSTAMP T212245Z DESCRIPTION DTEND TZID America Chicago T090000 DTSTART TZID America Chicago T080000 SUMMARY Run Begins END VEVENT BEGIN VEVENT UID T152245CST C7VJtG aps anl gov DTSTAMP T212245Z DESCRIPTION Anthony Cugini DOE NETL DTEND TZID America Chicago T120000 DTSTART TZID America Chicago T110000 LOCATION Y AUD SUMMARY Application of Computational Science for Fossil Fuel Conversion

395

Electrochemical catalyst recovery method  

DOE Patents (OSTI)

A method of recovering catalyst material from latent catalyst material solids includes: (a) combining latent catalyst material solids with a liquid acid anolyte solution and a redox material which is soluble in the acid anolyte solution to form a mixture; (b) electrochemically oxidizing the redox material within the mixture into a dissolved oxidant, the oxidant having a potential for oxidation which is effectively higher than that of the latent catalyst material; (c) reacting the oxidant with the latent catalyst material to oxidize the latent catalyst material into at least one oxidized catalyst species which is soluble within the mixture and to reduce the oxidant back into dissolved redox material; and (d) recovering catalyst material from the oxidized catalyst species of the mixture. The invention is expected to be particularly useful in recovering spent catalyst material from petroleum hydroprocessing reaction waste products having adhered sulfides, carbon, hydrocarbons, and undesired metals, and as well as in other industrial applications. 3 figs.

Silva, L.J.; Bray, L.A.

1995-05-30T23:59:59.000Z

396

Thermal Recovery Methods  

SciTech Connect

Thermal Recovery Methods describes the basic concepts of thermal recovery and explains the injection patterns used to exploit reservoir conditions. Basic reservoir engineering is reviewed with an emphasis on changes in flow characteristics caused by temperature. The authors discuss an energy balance for steam and combustion drive, and they explain in situ reactions. Heat loss, combustion drive, and steam displacement also are examined in detail, as well as cyclic steam injection, downhole ignition, well heating, and low-temperature oxidation. Contents: Thermal processes; Formation and reservoir evaluations; Well patterns and spacing; Flow and process equations; Laboratory simulation of thermal recovery; Heat loss and transmission; Displacement and production; Equipment; Basic data for field selection; Laboratory evaluation of combustion characteristics; Thermal properties of reservoirs and fluids.

White, P.D.; Moss, J.T.

1983-01-01T23:59:59.000Z

397

Method for controlling brazing  

DOE Patents (OSTI)

A method for making a braze joint across a discontinuity in a work piece using alternating current. A filler metal is pre-placed at a location sufficiently close to the discontinuity such that, when an alternating current is applied across a work piece to heat the work piece and melt the filler metal, the filler metal is drawn into the discontinuity. The alternating current is maintained for a set residence time, generally less than 10 seconds and more particularly less than 3 seconds. The alternating current is then altered, generally by reducing the current and/or voltage such that the filler metal can solidify to form a braze joint of desired quality and thickness.

Hosking, F. Michael (Albuquerque, NM); Hall, Aaron C. (Albuquerque, NM); Givler, Richard C. (Albuquerque, NM); Walker, Charles A. (Albuquerque, NM)

2006-08-01T23:59:59.000Z

398

Freeze drying method  

DOE Patents (OSTI)

The present invention provides methods and apparatus for freeze drying in which a solution, which can be a radioactive salt dissolved within an acid, is frozen into a solid on vertical plates provided within a freeze drying chamber. The solid is sublimated into vapor and condensed in a cold condenser positioned above the freeze drying chamber and connected thereto by a conduit. The vertical positioning of the cold condenser relative to the freeze dryer helps to help prevent substances such as radioactive materials separated from the solution from contaminating the cold condenser. Additionally, the system can be charged with an inert gas to produce a down rush of gas into the freeze drying chamber to also help prevent such substances from contaminating the cold condenser.

Coppa, Nicholas V. (Malvern, PA); Stewart, Paul (Youngstown, NY); Renzi, Ernesto (Youngstown, NY)

1999-01-01T23:59:59.000Z

399

Magnesium fluoride recovery method  

DOE Patents (OSTI)

A method of obtaining magnesium fluoride substantially free from radioactive uranium from a slag containing the same and having a radioactivity level of at least about 7000 pCi/gm. The slag is ground to a particle size of about 200 microns or less. The ground slag is contacted with an acid under certain prescribed conditions to produce a liquid product and a particulate solid product. The particulate solid product is separated from the liquid and treated at least two more times with acid to produce a solid residue consisting essentially of magnesium fluoride substantially free of uranium and having a residual radioactivity level of less than about 1000 pCi/gm. In accordance with a particularly preferred embodiment of the invention a catalyst and an oxidizing agent are used during the acid treatment and preferably the acid is sulfuric acid having a strength of about 1.0 Normal.

Gay, Richard L. (Canoga Park, CA); McKenzie, Donald E. (Woodland Hills, CA)

1989-01-01T23:59:59.000Z

400

Method for maskless lithography  

DOE Patents (OSTI)

The present invention provides a method for maskless lithography. A plurality of individually addressable and rotatable micromirrors together comprise a two-dimensional array of micromirrors. Each micromirror in the two-dimensional array can be envisioned as an individually addressable element in the picture that comprises the circuit pattern desired. As each micromirror is addressed it rotates so as to reflect light from a light source onto a portion of the photoresist coated wafer thereby forming a pixel within the circuit pattern. By electronically addressing a two-dimensional array of these micromirrors in the proper sequence a circuit pattern that is comprised of these individual pixels can be constructed on a microchip. The reflecting surface of the micromirror is configured in such a way as to overcome coherence and diffraction effects in order to produce circuit elements having straight sides.

Sweatt, William C. (13027 Arrovo de Vista, Albuquerque, NM 87111); Stulen, Richard H. (5258 Roxanne Ct., Livermore, Alameda County, CA 94550)

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Floating Silicon Method  

SciTech Connect

The Floating Silicon Method (FSM) project at Applied Materials (formerly Varian Semiconductor Equipment Associates), has been funded, in part, by the DOE under a “Photovoltaic Supply Chain and Cross Cutting Technologies” grant (number DE-EE0000595) for the past four years. The original intent of the project was to develop the FSM process from concept to a commercially viable tool. This new manufacturing equipment would support the photovoltaic industry in following ways: eliminate kerf losses and the consumable costs associated with wafer sawing, allow optimal photovoltaic efficiency by producing high-quality silicon sheets, reduce the cost of assembling photovoltaic modules by creating large-area silicon cells which are free of micro-cracks, and would be a drop-in replacement in existing high efficiency cell production process thereby allowing rapid fan-out into the industry.

Kellerman, Peter

2013-12-21T23:59:59.000Z

402

Method for forming materials  

DOE Patents (OSTI)

A material-forming tool and a method for forming a material are described including a shank portion; a shoulder portion that releasably engages the shank portion; a pin that releasably engages the shoulder portion, wherein the pin defines a passageway; and a source of a material coupled in material flowing relation relative to the pin and wherein the material-forming tool is utilized in methodology that includes providing a first material; providing a second material, and placing the second material into contact with the first material; and locally plastically deforming the first material with the material-forming tool so as mix the first material and second material together to form a resulting material having characteristics different from the respective first and second materials.

Tolle, Charles R. (Idaho Falls, ID); Clark, Denis E. (Idaho Falls, ID); Smartt, Herschel B. (Idaho Falls, ID); Miller, Karen S. (Idaho Falls, ID)

2009-10-06T23:59:59.000Z

403

The Effects of Walking Surface and Vibration on the Gait Pattern and Vibration Perception Threshold of Typically Developing Children and Children with Idiopathic Toe Walking.  

E-Print Network (OSTI)

?? The aim of the current study is to investigate novel therapeutic/treatment methods and outcome measurement for children with Idiopathic Toe Walking (ITW). Fifteen typically… (more)

Fanchiang, Hsin-chen

2014-01-01T23:59:59.000Z

404

Threshold characteristics of semiconductor microdisk lasers R. E. Slusher, A. F. J. Levi, U. Mohideen, S. L. McCall, S. J. Peat-ton, and R. A. Logan  

E-Print Network (OSTI)

characteristics of InGaAs/InGaAsP microdisk lasers with optical emission near a wavelength /2=1.52 pm. More than 5 in a factor of l/f' in the calculated mode spacing. Loss due to optical absorption in the cold cavity (pumping well below threshold) leads to Q;`=aU 2rrn,s fg where a is the absorption coefficient obtained

Levi, Anthony F. J.

405

Method for etherifications  

DOE Patents (OSTI)

A method is described for producing tertiary ethers from C[sub 4] or C[sub 5] streams containing isobutene and isoamylene respectively in a process wherein a acidic cation exchange resin is used as the catalyst and as a distillation structure in a distillation reactor column, wherein the improvement is the operation of the catalytic distillation in two zones at different pressures, the first zone containing the catalyst packing and operated a higher pressure in the range of 100 to 200 psig in the case of C[sub 4] and 15 to 100 psig in the case of C[sub 5] which favors the etherification reaction and the second zone being a distillation operated at a lower pressure in the range of 0 to 100 psig in the case of C[sub 4] and 0 to 15 psig in the case of C[sub 5] wherein a first overhead from the first zone is fractionated to remove a portion of the unreacted alcohol from the first overhead and to return a condensed portion containing said alcohol to the first zone and to produce a second overhead having less alcohol than said first overhead. 3 figs.

Jones, E.M. Jr.

1985-03-12T23:59:59.000Z

406

Method of turbocharger control  

SciTech Connect

This patent describes a method of turbocharger control in a vehicle having an engine and a turbocharger for increasing the density of at least the air entering a cylinder of the engine. The turbocharger has at least a compressor and a turbine coupled by a shaft and a nozzle to increase the angular momentum of the flow of gas to the turbine. The nozzle has a housing and movable vanes to vary the angle and velocity that the exhaust gas hits the wheel of the turbine, and actuator for moving the vanes, a can separated by a diaphragm and having an A side and B side for actuating the actuator, solenoid-actuated valves for controlling the pressure in the A and B sides of the can, an electronic control unit (ECU) having memory for storing data and predetermined values and for actuating and de-actuating the solenoid-actuated valves, a plurality of inputs to the ECU for providing input data indicative of engine temperature, engine speed, vehicle speed, intake manifold pressure, throttle angle, engine knock and charge air temperature.

Lyon, K.M.

1990-10-09T23:59:59.000Z

407

Method of Separating Tangents  

E-Print Network (OSTI)

The well known Jensen inequality, holds true for every convex functions. However, we found that it is possible to apply it to some problems related to nonconvex functions for which Jensen's inequality holds true locally. Having considered a set of such functions, we noted some general patterns. We show that the key point, which provides Jensen's inequality holds true locally, is that the plot of function should be situated at only one side from the local base curve defined compatible with conditional variables. Moreover, we have achieved even more general result. It turned out that the graph of the function can be located on either sides of the local base curve, with the conditions. This result allows one to prove easily difficult types of inequalities, and on the other hand to broaden applications in physics, economy, and information theory. On the basis of the conducted analysis of different sources it is possible to claim, that our method is applicable to about three fourths of studied inequalities related to Jensen's inequality.

Adilsultan Lepes

2014-12-12T23:59:59.000Z

408

Method for producing superconductors  

SciTech Connect

In a method for producing v/sub 3/Ga superconductors which comprises forming a composite of a core portion and a sheath portion surrounding said core portion, said sheath portion being composed of a gallium-containing alloy selected from the group consisting of copper-gallium and copper-silver-gallium alloys, and said core portion being composed of a vanadium metal, elongating said composite, and heat-treating the resulting elongated composite to form a v/sub 3/Ga layer between said sheath and core portions; the improvement wherein the gallium-containing alloy has a gallium content of 0.1 to 30 atomic percent and additionally contains at least one metal selected from the group consisting of 0.05 to 5 atomic percent of magnesium, 0.5 to 10 atomic percent of aluminum , 0.1 to 10 atomic percent of cerium and 0.05 to 10 atomic percent of sodium, and the vanadium metal is a vanadium alloy containing 0.1 to 15 atomic percent of gallium.

Asano, T.; Tachikawa, K.; Tanaka, Y.; Yoshida, Y.

1981-06-23T23:59:59.000Z

409

Concerted unimolecular triple dissociation of s-tetrazine: Transition-state structural optimizations using configuration interaction and coupled cluster methods  

SciTech Connect

High level ab initio quantum mechanical methods have been applied to the reaction s-tetrazine {yields} 2HCN + N{sub 2}. Basis sets as large as triple-{zeta} plus double polarization (TZ2P) were used in conjunction with configuration interaction and coupled cluster methods including in some cases all triple excitations (CCSDT-1). The result is an enormous decrease in the predicted triple dissociation barrier height from 79.4 kcal (double-{zeta} plus polarization basis set, self-consistent-field method) to the final barrier of 38.3 kcal. After correction for zero-point vibrational energies, the predicted activation energy is only 33.1 kcal. Since this prediction falls well below the threshold for photodissociation (51.8 kcal), new experiments are called for.

Scuseria, G.E. (Rice Univ., Houston, TX (USA)); Schaefer, H.F. III (Univ. of Georgia, Athens (USA))

1990-07-12T23:59:59.000Z

410

Methods of Purchasing Purchasing methods include the different  

E-Print Network (OSTI)

" purchases must be reviewed and approved by the Controller's Office. This may result in the end user beingMethods of Purchasing Purchasing methods include the different processes of ordering goods and/or services, and encumbering funds. #12;Method of Purchase Field Purchase Orders (FPO) Accepted

411

A New Framework for Combining Global and Local Methods in ...  

E-Print Network (OSTI)

Jul 29, 2013 ... recent metamodels include kriging (also known as Gaussian Process ... to determine these key performance thresholds in advance, the parameter values for the switch criteria are ...... in Aerospace Sciences 45 50–79.

2013-07-29T23:59:59.000Z

412

Neutron Scattering Methods in Chemistry  

Science Journals Connector (OSTI)

Starting with basic properties of the neutron, this chapter reviews the most important neutron scattering methods that provide valuable information for a ... wide, from standard methods of crystallography to neutron

L. Pusztai

2011-01-01T23:59:59.000Z

413

The Uniform Methods Project: Methods for Determining Energy Efficiency  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

The Uniform Methods Project: Methods for Determining Energy The Uniform Methods Project: Methods for Determining Energy Efficiency Savings for Specific Measures (April 2013) The Uniform Methods Project: Methods for Determining Energy Efficiency Savings for Specific Measures (April 2013) In April 2013 the National Renewable Energy Laboratory (NREL) published the first set of protocols for determining energy savings from energy efficiency measures and programs. Funded by the Office of Electricity Delivery and Energy Reliability and the Office of Energy Efficiency and Renewable Energy, the developed protocols provide a straightforward method for evaluating gross energy savings for each of the most common residential and commercial measures and programs offered by ratepayer-funded energy efficiency programs in the US. Using a single measurement and verification

414

Methods of making textured catalysts  

DOE Patents (OSTI)

A textured catalyst having a hydrothermally-stable support, a metal oxide and a catalyst component is described. Methods of conducting aqueous phase reactions that are catalyzed by a textured catalyst are also described. The invention also provides methods of making textured catalysts and methods of making chemical products using a textured catalyst.

Werpy, Todd (West Richland, WA); Frye, Jr., John G. (Richland, WA); Wang, Yong (Richland, WA); Zacher, Alan H. (Kennewick, WA)

2010-08-17T23:59:59.000Z

415

APPENDIX: BAYESIAN REGRESSION METHODS Introduction  

E-Print Network (OSTI)

statistics begins with a model for the joint probability distribution of and y, p(,y). may be a single to VI derive from Bayesian statistics. Bayesian methods are less familiar than some other statistical variables (Gelman et al. 1995). Bayesian methods can be used for any probability distribution. The methods

416

ANALYTICAL METHODS in CHEMICAL ECOLOGY  

E-Print Network (OSTI)

ANALYTICAL METHODS in CHEMICAL ECOLOGY a post graduate course (doktorandkurs) when: February 10 ­ 28, 2014 where: Chemical Ecology, Plant Protection Biology, Swedish University of Agriculture (SLU to modern analytical methods used in Chemical Ecological and Ecotoxicological research, such as: methods

417

Excitation Methods for Bridge Structures  

SciTech Connect

This paper summarizes the various methods that have been used to excited bridge structures during dynamic testing. The excitation methods fall into the general categories of ambient excitation methods and measured-input excitation methods. During ambient excitation the input to the bridge is not directly measured. In contrast, as the category label implies, measured-input excitations are usually applied at a single location where the force input to the structure can be monitored. Issues associated with using these various types of measurements are discussed along with a general description of the various excitation methods.

Farrar, C.R.; Duffy, T.A.; Cornwell, P.J.; Doebling, S.W.

1999-02-08T23:59:59.000Z

418

Improved real-time method for noise reduction of directional Doppler audio signals  

Science Journals Connector (OSTI)

A noise reduction filter for Doppler audio signals is one important part of Transcranial Doppler ultrasound system. Several studies have been carried out for low-pass filter with fixed value for Doppler audio signals; however, most of these studies lacked complex research works and few studies analyzed the relationship of both parts of spectrum signal processing and audio signal processing. To solve the above-mentioned concern, this research is focused on the algorithms of de-noising and enveloping of spectrum signal processing part and improved new real-time method, which reduces the noise using low-pass filter with a variable threshold value based on maximum frequency of spectrum signals. The noise of Doppler audio signals was reduced efficiently by using this algorithm.

Erdenedalai Naranchimeg; Byambasuren Bat-Erdene; Seung-Moo Han

2012-01-01T23:59:59.000Z

419

Method of making alkyl esters  

DOE Patents (OSTI)

Methods of making alkyl esters are described herein. The methods are capable of using raw, unprocessed, low-cost feedstocks and waste grease. Generally, the method involves converting a glyceride source to a fatty acid composition and esterifying the fatty acid composition to make alkyl esters. In an embodiment, a method of making alkyl esters comprises providing a glyceride source. The method further comprises converting the glyceride source to a fatty acid composition comprising free fatty acids and less than about 1% glyceride by mass. Moreover, the method comprises esterifying the fatty acid composition in the presence of a solid acid catalyst at a temperature ranging firm about 70.degree. C. to about 120.degree. C. to produce alkyl esters, such that at least 85% of the free fatty acids are converted to alkyl esters. The method also incorporates the use of packed bed reactors for glyceride conversion and/or fatty acid esterification to make alkyl esters.

Elliott, Brian (Wheat Ridge, CO)

2010-09-14T23:59:59.000Z

420

Development of elastography as a non-invasive method for hard spots detection of packaged beef rations  

E-Print Network (OSTI)

automatic thresholding segmentation algorithms were also developed in this study. They selected the threshold value for segmentation based on the contour lines, the local minima of the histogram of the elastogram, and the magnitude of gradient of the Image....

Wang, Wei-wei

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Methods of manipulating stressed epistructures  

DOE Patents (OSTI)

A method of processing an epistructure or processing a semiconductor device including associating a conformal and flexible handle with the epistructure and removing the epistructure and handle as a unit from the parent substrate. The method further includes causing the epistructure and handle unit to conform to a shape that differs from the shape the epistructure otherwise inherently assumes upon removal from the parent substrate. A device prepared according to the disclosed methods.

Wanlass, Mark W

2014-04-08T23:59:59.000Z

422

Scientific Method, Statistical Method, and the Speed of Light.  

E-Print Network (OSTI)

Scientific Method, Statistical Method, and the Speed of Light. R.J. Mackay and R.W. Oldford Working on the speed of light carried out by A.A. Michelson in 1879. Our answer to the second question is negative. To understand this a history on the speed of light up to the time of Michelson's study is presented. The larger

Oldford, R.W.

423

Evaluation of Islanding Detection Methods  

Office of Scientific and Technical Information (OSTI)

shutdown associated with an out-of-frequency condition. Other countries such as Germany and Austria require a specific method based on sudden impedance changes and described...

424

Uniform Methods Project Related Links  

Office of Energy Efficiency and Renewable Energy (EERE)

The websites and publications listed below provide supporting information for the Uniform Methods Project and for evaluation, measurement, and verification (EM&V) of energy efficiency programs.

425

About the Uniform Methods Project  

Office of Energy Efficiency and Renewable Energy (EERE)

The Uniform Methods Project is developing measurement and verification protocols for determining energy savings for commonly implemented program measures. This work is being done through...

426

New Methods of Glasshouse Fumigation  

Science Journals Connector (OSTI)

... Hort. Soc.t 74, Pt. 10; 1949). Insecticidal smokes, produced by igniting pyrotechnic mixtures containing DDT, 'Gammexane' or 'Azobenzene', provide a very convenient method, ...

1950-07-22T23:59:59.000Z

427

Algebraic Statistics methods Giovanni Pistone  

E-Print Network (OSTI)

Algebraic Statistics methods for DOE Giovanni Pistone Department of Mathematics Politecnico di Torino, Italy giovanni.pistone@polito.it Eva Riccomagno Department of Mathematics Politecnico di Torino

Ceragioli, Francesca

428

Method of producing synthetic pitch  

DOE Patents (OSTI)

Embodiments of a method are described for modifying pitches, oils, tars, and binders by using these materials as solvents to extract organic chemicals from coal.

Kennel, Elliot B. (Morgantown, WV); Stansberry, Peter G. (North Olmsted, OH); Stiller, Alfred H. (Morgantown, WV); Zondlo, John W. (Albright, WV)

2012-07-24T23:59:59.000Z

429

The Uniform Methods Project: Methods for Determining Energy Efficiency  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Electricity Policy Coordination and Implementation » Electricity Policy Coordination and Implementation » State and Regional Policy Assistance » The Uniform Methods Project: Methods for Determining Energy Efficiency Savings for Specific Measures The Uniform Methods Project: Methods for Determining Energy Efficiency Savings for Specific Measures In April 2013 the National Renewable Energy Laboratory (NREL) published the first set of protocols for determining energy savings from energy efficiency measures and programs. Funded by the Office of Electricity Delivery and Energy Reliability and the Office of Energy Efficiency and Renewable Energy, the developed protocols provide a straightforward method for evaluating gross energy savings for each of the most common residential and commercial measures and programs offered by ratepayer-funded energy

430

Ratiometric Analysis of Single-Molecule Fluorescence Resonance Energy Transfer Using Logical Combinations of Threshold Criteria: A Study of 12-mer DNA  

E-Print Network (OSTI)

Ratiometric Analysis of Single-Molecule Fluorescence Resonance Energy Transfer Using LogicalEW United Kingdom ReceiVed: NoVember 5, 1999; In Final Form: March 13, 2000 Single-molecule can be readily distinguished by this single-molecule method. Fluorescence lifetimes and anisotropy

Wallace, Mark

431

Method of producing polyalkylated oligoalkylenepolyamines  

DOE Patents (OSTI)

A method of preparing polyalkylated oligoalkylenepolyamines is provided. The method includes contacting oligoalkylenepolyamine with a reagent composition comprising (a) alkyl bromide and/or alkyl chloride; (b) a basic agent; and (c) iodide salt. The alkylation reaction may be carried out in a polar, aprotic organic solvent.

Elangovan, Arumugasamy

2014-02-25T23:59:59.000Z

432

Challenging Proteins Principles and Methods  

E-Print Network (OSTI)

.............................................................................................................................................................12 Small-scale expression screening of histidine-tagged membrane proteins from E. coli lysates Gel Filtration Principles and Methods 18-1022-18 Recombinant Protein Purification Handbook Principles and Methods 18-1142-75 Protein Purification Handbook 18-1132-29 Hydrophobic Interaction and Reversed Phase

Jacobsen, Steve

433

Drilling Methods | Open Energy Information  

Open Energy Info (EERE)

Drilling Methods Drilling Methods Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Drilling Methods Details Activities (0) Areas (0) Regions (0) NEPA(5) Exploration Technique Information Exploration Group: Exploration Sub Group: None Parent Exploration Technique: Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Thermal: Dictionary.png Drilling Methods: No definition has been provided for this term. Add a Definition References No exploration activities found. Document # Analysis Type Applicant Geothermal Area Lead Agency District Office Field Office Mineral Manager Surface Manager Development Phase(s) Techniques CA-170-02-15 EA Mammoth Pacific Long Valley Caldera Geothermal Area BLM BLM Central California District Office BLM Bishop Field Office BLM Geothermal/Exploration Drilling Methods

434

Gravity Methods | Open Energy Information  

Open Energy Info (EERE)

Gravity Methods Gravity Methods Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Gravity Methods Details Activities (0) Areas (0) Regions (0) NEPA(3) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Gravity Techniques Parent Exploration Technique: Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Thermal: Dictionary.png Gravity Methods: No definition has been provided for this term. Add a Definition References No exploration activities found. Document # Analysis Type Applicant Geothermal Area Lead Agency District Office Field Office Mineral Manager Surface Manager Development Phase(s) Techniques NVN-084630 CU Vulcan Energy Patua Geothermal Area BLM Nevada State Office BLM Winnemucca District Office BLM Humboldt River Field Office BLM BLM Geothermal/Exploration Gravity Methods

435

Requirements for Hypermedia Development Methods: A Survey of Outstanding Methods  

Science Journals Connector (OSTI)

The aim of this paper is to present a framework of requirements to survey design methods for hypermedia systems. Such requirements are taken from software engineering as well as from hypermedia engineering fields. Finally, these requirements are applied ...

Susana Montero; Paloma Díaz; Ignacio Aedo

2002-05-01T23:59:59.000Z

436

Study of psi(2S) Decays to gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} and Search for p bar{p} Threshold Enhancements  

E-Print Network (OSTI)

The decays of psi(2S) into gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} have been studied with the CLEO-c detector using a sample of 24.5 million psi(2S) events obtained from e^+e^- annihilations at sqrt{s} = 3686 MeV. The data show evidence for the excitation of several N^* resonances in p pi^0 and p eta channels in pi^0 p bar{p} and eta p bar{p} decays, and f_2 states in gamma p bar{p} decay. Branching fractions for decays of psi(2S) to gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} have been determined. No evidence for p bar{p} threshold enhancements was found in the reactions psi(2S)-> X p bar{p}, where X = gamma, pi^0, eta. We do, however, find confirming evidence for a p bar{p} threshold enhancement in J/psi-> gamma p bar{p} as previously reported by BES.

CLEO Collaboration; J. P. Alexander; D. G. Cassel; S. Das; R. Ehrlich; L. Fields; L. Gibbons; S. W. Gray; D. L. Hartill; B. K. Heltsley; D. L. Kreinick; V. E. Kuznetsov; J. R. Patterson; D. Peterson; D. Riley; A. Ryd; A. J. Sadoff; X. Shi; W. M. Sun; J. Yelton; P. Rubin; N. Lowrey; S. Mehrabyan; M. Selen; J. Wiss; S. Adams; M. Kornicer; R. E. Mitchell; M. R. Shepherd; C. M. Tarbert; D. Besson; T. K. Pedlar; J. Xavier; D. Cronin-Hennessy; J. Hietala; P. Zweber; S. Dobbs; Z. Metreveli; K. K. Seth; A. Tomaradze; T. Xiao; S. Brisbane; J. Libby; L. Martin; A. Powell; P. Spradlin; G. Wilkinson; H. Mendez; J. Y. Ge; D. H. Miller; I. P. J. Shipsey; B. Xin; G. S. Adams; D. Hu; B. Moziak; J. Napolitano; K. M. Ecklund; J. Insler; H. Muramatsu; C. S. Park; L. J. Pearson; E. H. Thorndike; F. Yang; S. Ricciardi; C. Thomas; M. Artuso; S. Blusk; R. Mountain; T. Skwarnicki; S. Stone; J. C. Wang; L. M. Zhang; G. Bonvicini; D. Cinabro; A. Lincoln; M. J. Smith; P. Zhou; J. Zhu; P. Naik; J. Rademacker; D. M. Asner; K. W. Edwards; K. Randrianarivony; G. Tatishvili; R. A. Briere; H. Vogel; P. U. E. Onyisi; J. L. Rosner

2010-07-16T23:59:59.000Z

437

Method of passivating semiconductor surfaces  

DOE Patents (OSTI)

A method of passivating Group III-V or II-VI semiconductor compound surfaces. The method includes selecting a passivating material having a lattice constant substantially mismatched to the lattice constant of the semiconductor compound. The passivating material is then grown as an ultrathin layer of passivating material on the surface of the Group III-V or II-VI semiconductor compound. The passivating material is grown to a thickness sufficient to maintain a coherent interface between the ultrathin passivating material and the semiconductor compound. In addition, a device formed from such method is also disclosed.

Wanlass, Mark W. (Golden, CO)

1990-01-01T23:59:59.000Z

438

The Method of Boundary Perturbation,  

NLE Websites -- All DOE Office Websites (Extended Search)

Method of Boundary Perturbation, Method of Boundary Perturbation, and Its Application to Wakefield Calculationst Weiren Chou+ Advanced Photon Source Argonne National Laboratory 9700 S. Cass Ave. Argonne, IL 60439 USA Spring Meeting of The American Physical Society Division of Physics of Beams Washington, D.C. April 16-19, 1990 tWork supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under Contract W-31-109-ENG-38. tPresent address: SSC Laboratory, Accelerator Division, MS-I046, 2550 Beckleymeade Ave., Dallas, TX 75237, USA. LS-/~ Method of Boundary Perturbation, and Its Application to Wakefield Calculations ABSTRACT The boundary perturbation method, suggested by Zhang and, independently, by Chatard-Moulin, Cooper, and their colleagues, is employed to the wakefield cal-

439

Magnetotelluric Methods | Open Energy Information  

Open Energy Info (EERE)

Magnetotelluric Methods Magnetotelluric Methods Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Magnetotelluric Methods Details Activities (0) Areas (0) Regions (0) NEPA(3) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Thermal: Dictionary.png Magnetotelluric Methods: No definition has been provided for this term. Add a Definition References No exploration activities found. Document # Analysis Type Applicant Geothermal Area Lead Agency District Office Field Office Mineral Manager Surface Manager Development Phase(s) Techniques DOI-BLM-NV-C010-2012-0070-CX CX US Navy Geothermal Program Office Dixie Valley Geothermal Area BLM BLM Carson City District Office BLM Stillwater Field Office BLM BLM Geothermal/Exploration Reflection Survey

440

ALTERNATING DIRECTION METHODS FOR SPARSE ...  

E-Print Network (OSTI)

Since zero entries in the inverse covariance matrix correspond to the conditional ..... All the codes of the ADM approach were written by Matlab 7.1. .... graphs via chordal embedding, Optimization Methods and Software 23 (4) (2008), pp. 501-.

2009-09-04T23:59:59.000Z

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Peptides and methods against diabetes  

DOE Patents (OSTI)

This invention relates to methods of preventing or reducing the severity of diabetes. In one embodiment, the method involves administering to the individual a peptide having substantially the sequence of a on-conserved region sequence of a T cell receptor present on the surface of T cells mediating diabetes or a fragment thereof, wherein the peptide or fragment is capable of causing an effect on the immune system to regulate the T cells. In particular, the T cell receptor has the V.beta. regional V.beta.6 or V.beta.14. In another embodiment, the method involves gene therapy. The invention also relates to methods of diagnosing diabetes by determining the presence of diabetes predominant T cell receptors.

Albertini, Richard J. (Underhill Center, VT); Falta, Michael T. (Hinesburg, VT)

2000-01-01T23:59:59.000Z

442

Method of modifying a surface  

DOE Patents (OSTI)

The present invention provides a surface modification method that provides beneficial changes in surface properties, can modify a surface to a greater depth than previous methods, and that is suitable for industrial application. The present method comprises applying a thin-film coating to a surface of a substrate, then subjecting the coated surface to an ion beam. The ion beam power pulse heats the coated surface, leading to alloying between the material in the coating and the material of the substrate. Rapid cooling of the alloyed layer after an ion beam pulse can lead to formation of metastable alloys and microstructures not accessible by conventional alloying methods or intense ion beam treatment of the substrate alone.

Renk, Timothy J. (Albuquerque, NM); Sorensen, Neil R. (Albuquerque, NM); Senft, Donna Cowell (Albuquerque, NM); Buchheit, Jr., Rudolph G. (Columbus, OH); Thompson, Michael O. (Ithaca, NY); Grabowski, Kenneth S. (Alexandria, VA)

2000-01-01T23:59:59.000Z

443

Reduced shedding regenerator and method  

DOE Patents (OSTI)

A reduced shedding regenerator and method are disclosed with regenerator surfaces to minimize shedding of particles from the regenerator thereby alleviating a source of potential damage and malfunction of a thermal regenerative machine using the regenerator.

Qiu, Songgang (Richland, WA); Augenblick, John E. (Richland, WA); Erbeznik, Raymond M. (Kennewick, WA)

2007-05-22T23:59:59.000Z

444

The Modified Embedded Atom Method  

SciTech Connect

Recent modifications have been made to generalize the Embedded Atom Method (EAM) to describe bonding in diverse materials. By including angular dependence of the electron density in an empirical way, the Modified Embedded Atom Method (MEAM) has been able to reproduce the basic energetic and structural properties of 45 elements. This method is ideally suited for examining the interfacial behavior of dissimilar materials. This paper explains in detail the derivation of the method, shows how the parameters of the MEAM are determined directly from experiment or first principles calculations, and examines the quality of the reproduction of the database. Materials with fcc, bcc, hcp, and diamond cubic crystal structure are discussed. A few simple examples of the application of the MEAM to surfaces and interfaces are presented. Calculations of pullout of a SiC fiber in a diamond matrix as a function of applied stress show non-uniform deformation of the fiber.

Baskes, M.I.

1994-08-01T23:59:59.000Z

445

Method for controlling powertrain pumps  

DOE Patents (OSTI)

A method of controlling a pump supplying a fluid to a transmission includes sensing a requested power and an excess power for a powertrain. The requested power substantially meets the needs of the powertrain, while the excess power is not part of the requested power. The method includes sensing a triggering condition in response to the ability to convert the excess power into heat in the transmission, and determining that an operating temperature of the transmission is below a maximum. The method also includes determining a calibrated baseline and a dissipation command for the pump. The calibrated baseline command is configured to supply the fluid based upon the requested power, and the dissipation command is configured to supply additional fluid and consume the excess power with the pump. The method operates the pump at a combined command, which is equal to the calibrated baseline command plus the dissipation command.

Sime, Karl Andrew; Spohn, Brian L; Demirovic, Besim; Martini, Ryan D; Miller, Jean Marie

2013-10-22T23:59:59.000Z

446

Method of Dehalogenation using Diamonds  

SciTech Connect

A method for preparing olefins and halogenated olefins is provided comprising contacting halogenated compounds with diamonds for a sufficient time and at a sufficient temperature to convert the halogenated compounds to olefins and halogenated olefins via elimination reactions.

Farcasiu, Malvina; Kaufman, Phillip B.; Ladner, Edward P.; Anderson, Richard R.

1999-02-26T23:59:59.000Z

447

Hedge Algorithm and Subgradient Methods  

E-Print Network (OSTI)

can be interpreted as an approximation of the utility function over gains and losses used ... fixing the step-size, from a simple approximate line-search method to ...

2010-10-05T23:59:59.000Z

448

Atomistic methods in fluid simulation  

Science Journals Connector (OSTI)

...easily describable by traditional methods, as ICF involves a complex coupling between fluid instabilities and combustion processes at very small length and times scales. One contribution of 13 to a Theme Issue Turbulent mixing and beyond . Figure...

2010-01-01T23:59:59.000Z

449

Method for determining gene knockouts  

DOE Patents (OSTI)

A method for determining candidates for gene deletions and additions using a model of a metabolic network associated with an organism, the model includes a plurality of metabolic reactions defining metabolite relationships, the method includes selecting a bioengineering objective for the organism, selecting at least one cellular objective, forming an optimization problem that couples the at least one cellular objective with the bioengineering objective, and solving the optimization problem to yield at least one candidate.

Maranas, Costa D; Burgard, Anthony R; Pharkya, Priti

2013-06-04T23:59:59.000Z

450

Method to blend separator powders  

DOE Patents (OSTI)

A method for making a blended powder mixture, whereby two or more powders are mixed in a container with a liquid selected from nitrogen or short-chain alcohols, where at least one of the powders has an angle of repose greater than approximately 50 degrees. The method is useful in preparing blended powders of Li halides and MgO for use in the preparation of thermal battery separators.

Guidotti, Ronald A. (Albuquerque, NM); Andazola, Arthur H. (Albuquerque, NM); Reinhardt, Frederick W. (Albuquerque, NM)

2007-12-04T23:59:59.000Z

451

Analytical methods under emergency conditions  

SciTech Connect

This lecture discusses methods for the radiochemical determination of internal contamination of the body under emergency conditions, here defined as a situation in which results on internal radioactive contamination are needed quickly. The purpose of speed is to determine the necessity for medical treatment to increase the natural elimination rate. Analytical methods discussed include whole-body counting, organ counting, wound monitoring, and excreta analysis. 12 references. (ACR)

Sedlet, J.

1983-01-01T23:59:59.000Z

452

Method for grinding precision components  

SciTech Connect

A method for precision cylindrical grinding of hard brittle materials, such as ceramics or glass and composites comprising ceramics or glass, provides material removal rates as high as 19--380 cm{sup 3}/min/cm. The abrasive tools used in the method comprise a strong, light weight wheel core bonded to a continuous rim of abrasive segments containing superabrasive grain in a dense metal bond matrix.

Ramanath, S.; Kuo, S.Y.; Williston, W.H.; Buljan, S.T.

2000-02-01T23:59:59.000Z

453

Analysis and forecasting of wind velocity in chetumal, quintana roo, using the single exponential smoothing method  

Science Journals Connector (OSTI)

In this paper the analysis and forecasting of wind velocities in Chetumal, Quintana Roo, Mexico is presented. Measurements were made by the Instituto de Investigaciones Eléctricas (IIE) during two years, from 2004 to 2005. This location exemplifies the wind energy generation potential in the Caribbean coast of Mexico that could be employed in the hotel industry in the next decade. The wind speed and wind direction were measured at 10 m above ground level. Sensors with high accuracy and a low starting threshold were used. The wind velocity was recorded using a data acquisition system supplied by a 10 W photovoltaic panel. The wind speed values were measured with a frequency of 1 Hz and the average wind speed was recorded considering regular intervals of 10 min. First a statistical analysis of the time series was made in the first part of the paper through conventional and robust measures. Also the forecasting of the last day of measurements was made utilizing the single exponential smoothing method (SES). The results showed a very good accuracy of the data with this technique for an ? value of 0.9. Finally the SES method was compared with the artificial neural network (ANN) method showing the former better results.

E. Cadenas; O.A. Jaramillo; W. Rivera

2010-01-01T23:59:59.000Z

454

Bayesian method for global optimization  

Science Journals Connector (OSTI)

We introduce a Bayesian approach for obtaining the global optimum of multimodal functions. The set of observed minima of a multimodal function is viewed as a sample from a multinomial distribution, whose cells correspond to the basins of attraction of the local optima. We then derive the posterior distribution of the number of local optima. This posterior information is obtained from a Bayesian analysis and is used to construct a stopping criterion for a sequential random search method which finds the optimal tradeoff between reliability and computational effort. The computational complexity of this global optimization method is a strong function of the total number of local optima and a weak function of the dimensions of the configuration space. Application to four classical problems from the global optimization literature, a bifunctional catalytic reactor problem, and the conformation problem of Lennard-Jones microclusters is demonstrated. Comparisons with the Bayesian method of Boender and Rinooy Kan [Math. Program. 37, 59 (1987)] and the simulated annealing method of Dekkers and Aarts [Math. Program. 50, 367 (1991)] are provided and, in each case, the computational complexity of our method is shown to be smaller than that of these methods.

Prasana K. Venkatesh; Morrel H. Cohen; Robert W. Carr; Anthony M. Dean

1997-05-01T23:59:59.000Z

455

Method of Synthesis of Proton Conducting Materials  

NLE Websites -- All DOE Office Websites (Extended Search)

Method of Synthesis of Proton Conducting Materials Method of Synthesis of Proton Conducting Materials A method of producing a proton conducting material. Available for thumbnail of...

456

Unimolecular photodissociation dynamics of ketene (CH{sub 2}CO): The singlet/triplet branching ratio and experimental observation of the vibrational level thresholds of the transition-state  

SciTech Connect

The rotational distributions of CO products from the dissociation of ketene at photolysis energies 10 cm{sup {minus}1} below, 56, 110, 200, 325, 425, 1,107, 1,435, 1,720, and 2,500 cm{sup {minus}1} above the singlet threshold, are measured in a supersonic free jet of ketene. The CO(v{double_prime} = 0) rotational distributions at 56, 110, 200, 325, and 425 cm{sup {minus}1} are bimodal. The peaks at low J`s, which are due to CO from the singlet channel, show that the product rotational distribution of CO product from ketene dissociation on the singlet surface is well described by phase space theory (PST). For CO(v{double_prime} = 0) rotational distributions at higher excess energies, the singlet and triplet contributions are not clearly resolved, and the singlet/triplet branching ratios are estimated by assuming that PST accurately predicts the CO rotational distribution from the singlet channel and that the distribution from the triplet channel changes little from that at 10 cm{sup {minus}1} below the singlet threshold. At 2,500 cm{sup {minus}1} excess energy, the CO(v{double_prime} = 1) rotational distribution is obtained, and the ratio of CO(v{double_prime} = 1) to CO(v{double_prime} = 0) products for the singlet channel is close to the variational RRKM calculation, 0.038, and the separate statistical ensembles (SSE) prediction, 0.041, but much greater than the PST prediction, 0.016. Rate constants for the dissociation of ketene (CH{sub 2}CO) and deuterated ketene (CD{sub 2}CO) have been measured at the threshold for the production of the CH(D){sub 2} and CO. Sharp peaks observed in photofragment excitation (PHOFEX) spectra probing CO (v = 0, J = 2) product are identified with the C-C-O bending mode of the transition state. RRKM calculations are carried out for two limiting cases for the dynamics of K-mixing in highly vibrationally excited reactant states.

Kim, S.K.

1993-05-01T23:59:59.000Z

457

Comparison of homotopy analysis method and homotopy perturbation method  

E-Print Network (OSTI)

equation Songxin Liang , David J. Jeffrey Department of Applied Mathematics, University of Western Ontario an evolution equation used as the second example in a recent paper by Ganji et al (2007). It is found and t except t = 0. It is also found that the solution given by the variational iteration method (VIM

Jeffrey, David

458

Method and apparatus for generating low energy nuclear particles  

DOE Patents (OSTI)

A particle accelerator (12) generates an input particle beam having an initial energy level above a threshold for generating secondary nuclear particles. A thin target (14) is rotated in the path of the input beam for undergoing nuclear reactions to generate the secondary particles and correspondingly decrease energy of the input beam to about the threshold. The target (14) produces low energy secondary particles and is effectively cooled by radiation and conduction. A neutron scatterer (44) and a neutron filter (42) are also used for preferentially degrading the secondary particles into a lower energy range if desired.

Powell, James R. (Shoreham, NY); Reich, Morris (Flushing, NY); Ludewig, Hans (Brookhaven, NY); Todosow, Michael (Miller Place, NY)

1999-02-09T23:59:59.000Z

459

Method and apparatus for generating low energy nuclear particles  

DOE Patents (OSTI)

A particle accelerator generates an input particle beam having an initial energy level above a threshold for generating secondary nuclear particles. A thin target is rotated in the path of the input beam for undergoing nuclear reactions to generate the secondary particles and correspondingly decrease energy of the input beam to about the threshold. The target produces low energy secondary particles and is effectively cooled by radiation and conduction. A neutron scatterer and a neutron filter are also used for preferentially degrading the secondary particles into a lower energy range if desired. 18 figs.

Powell, J.R.; Reich, M.; Ludewig, H.; Todosow, M.

1999-02-09T23:59:59.000Z

460

Seismic Fracture Characterization Methods for Enhanced Geothermal...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Seismic Fracture Characterization Methods for Enhanced Geothermal Systems Seismic Fracture Characterization Methods for Enhanced Geothermal Systems Project objective: Make Seismic...

Note: This page contains sample records for the topic "bispectral threshold method" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Seismic Fracture Characterization Methods for Enhanced Geothermal...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Seismic Fracture Characterization Methods for Enhanced Geothermal Systems; 2010 Geothermal Technology Program Peer Review Report Seismic Fracture Characterization Methods for...

462

Robotic follow system and method  

SciTech Connect

Robot platforms, methods, and computer media are disclosed. The robot platform includes perceptors, locomotors, and a system controller, which executes instructions for a robot to follow a target in its environment. The method includes receiving a target bearing and sensing whether the robot is blocked front. If the robot is blocked in front, then the robot's motion is adjusted to avoid the nearest obstacle in front. If the robot is not blocked in front, then the method senses whether the robot is blocked toward the target bearing and if so, sets the rotational direction opposite from the target bearing, and adjusts the rotational velocity and translational velocity. If the robot is not blocked toward the target bearing, then the rotational velocity is adjusted proportional to an angle of the target bearing and the translational velocity is adjusted proportional to a distance to the nearest obstacle in front.

Bruemmer, David J [Idaho Falls, ID; Anderson, Matthew O [Idaho Falls, ID

2007-05-01T23:59:59.000Z

463

Deflation Methods in Fermion Inverters  

E-Print Network (OSTI)

I will review recent developments in matrix deflation methods, by Ronald Morgan/Walter Wilcox, Andreas Stathopoulos/Konstantinos Orginos, and Martin L\\"uscher, with application to lattice QCD fermion inversion. I will begin with a short review of deflation-related work in the field. The Morgan/Wilcox algorithms using GMRES and BiCGStab for deflation will be described. Typical results for quenched (Wilson and twisted mass) and dynamical configurations (CP-PACS and ETMC) will be displayed and discussed. I will outline how inclusion of multiple right-hand sides and multiple shifts can be accommodated within versions of these methods. I will also review deflation methods based on Conjugate Gradient introduced by Stathopoulos and Orginos for hermitian systems with multiple right-hand sides as well as L\\"uscher's non-hermitian domain decomposition algorithm using Generalized Conjugate Residual.}

Walter Wilcox

2007-10-23T23:59:59.000Z

464

Methods of producing transportation fuel  

DOE Patents (OSTI)

Systems, methods, and heaters for treating a subsurface formation are described herein. At least one method for producing transportation fuel is described herein. The method for producing transportation fuel may include providing formation fluid having a boiling range distribution between -5.degree. C. and 350.degree. C. from a subsurface in situ heat treatment process to a subsurface treatment facility. A liquid stream may be separated from the formation fluid. The separated liquid stream may be hydrotreated and then distilled to produce a distilled stream having a boiling range distribution between 150.degree. C. and 350.degree. C. The distilled liquid stream may be combined with one or more additives to produce transportation fuel.

Nair, Vijay (Katy, TX); Roes, Augustinus Wilhelmus Maria (Houston, TX); Cherrillo, Ralph Anthony (Houston, TX); Bauldreay, Joanna M. (Chester, GB)

2011-12-27T23:59:59.000Z

465

Green methods for hydrogen production  

Science Journals Connector (OSTI)

This paper discusses environmentally benign and sustainable, as green, methods for hydrogen production and categorizes them based on the driving sources and applications. Some potential sources are electrical, thermal, biochemical, photonic, electro-thermal, photo-thermal, photo-electric, photo-biochemical, and thermal-biochemical. Such forms of energy can be derived from renewable sources, nuclear energy and from energy recovery processes for hydrogen production purposes. These processes are analyzed and assessed for comparison purposes. Various case studies are presented to highlight the importance of green hydrogen production methods and systems for practical applications.

Ibrahim Dincer

2012-01-01T23:59:59.000Z

466

New methodical developments for GRANIT  

SciTech Connect

New methodical developments for the GRANIT spectrometer address further improvements of the critical parameters of this experimental installation, as well as its applications to new fields of research. Keeping in mind an extremely small fraction of ultra cold neutrons (UCN) that could be bound in gravitational quantum states, we look for methods to increase statistics due to: developing UCN sources with maximum phase-space density, counting simultaneously a large fraction of neutrons using position-sensitive detectors, and decreasing detector backgrounds. Also we explore an eventual application of the GRANIT spectrometer beyond the scope of its initial goals, for instance, for reflectometry with UCN.

Baessler, Stefan [ORNL; Nesvizhevsky, V. [ Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France; Toperverg, B [Ruhr University, Bochum, Germany; Zhernenkov, K. [Ruhr University, Bochum, Germany; Gagarski, A [Petersburg Nuclear Physics Institute, Gatchina, Russia; Lychagin, E [Joint Institute for Nuclear Research, Dubna, Russia; Muzychka, A [Joint Institute for Nuclear Research, Dubna, Russia; Strelkov, A [Joint Institute for Nuclear Research, Dubna, Russia; Mietke, A [Technische Universitat Dresden

2011-01-01T23:59:59.000Z

467

Combustion synthesis method and products  

DOE Patents (OSTI)

Disclosed is a method of producing dense refractory products, comprising: (a) obtaining a quantity of exoergic material in powder form capable of sustaining a combustion synthesis reaction; (b) removing absorbed water vapor therefrom; (c) cold-pressing said material into a formed body; (d) plasma spraying said formed body with a molten exoergic material to form a coat thereon; and (e) igniting said exoergic coated formed body under an inert gas atmosphere and pressure to produce self-sustained combustion synthesis. Also disclosed are products produced by the method.

Holt, J.B.; Kelly, M.

1993-03-30T23:59:59.000Z

468

Combustion synthesis method and products  

DOE Patents (OSTI)

Disclosed is a method of producing dense refractory products, comprising: (a) obtaining a quantity of exoergic material in powder form capable of sustaining a combustion synthesis reaction; (b) removing absorbed water vapor therefrom; (c) cold-pressing said material into a formed body; (d) plasma spraying said formed body with a molten exoergic material to form a coat thereon; and (e) igniting said exoergic coated formed body under an inert gas atmosphere and pressure to produce self-sustained combustion synthesis. Also disclosed are products produced by the method.

Holt, J. Birch (San Jose, CA); Kelly, Michael (West Alexandria, OH)

1993-01-01T23:59:59.000Z

469

Helicity dependence and contribution to the Gerasimov-Drell-Hearn sum rule of the ??d???NN reaction channels in the energy region from threshold up to the ?(1232) resonance  

Science Journals Connector (OSTI)

The helicity dependence of the ??d???-pp,??d???+nn, and ??d???0np reaction channels is studied for incident photon energies from threshold up to the ?(1232) resonance with inclusion of leading ?NN effects. The doubly polarized total and differential cross sections for parallel and antiparallel helicity states are predicted. Then the contribution of various channels to the deuteron spin asymmetry and the double polarization E asymmetry is calculated. In addition, the contribution to the Gerasimov-Drell-Hearn (GDH) integral from separate channels is evaluated by explicit integration up to a photon lab energy of 350 MeV. Sizeable effects from final-state interactions, specially for ?0 production, are found. The sensitivity of the results to the elementary pion photoproduction operator is also investigated. Considerable dependence of the results on the elementary amplitude is found. We expect that these results may be useful to interpret the recent measurements from LEGS@BNL, A2, and GDH@MAMI Collaborations.

E. M. Darwish; C. Fernández-Ramírez; E. Moya de Guerra; J. M. Udías

2007-10-15T23:59:59.000Z

470

Reformulated diesel fuel and method  

DOE Patents (OSTI)

A method for mathematically identifying at least one diesel fuel suitable for combustion in an automotive diesel engine with significantly reduced emissions and producible from known petroleum blendstocks using known refining processes, including the use of cetane additives (ignition improvers) and oxygenated compounds.

McAdams, Hiramie T [Carrollton, IL; Crawford, Robert W [Tucson, AZ; Hadder, Gerald R [Oak Ridge, TN; McNutt, Barry D [Arlington, VA

2006-08-22T23:59:59.000Z

471

Heat reclaiming method and apparatus  

DOE Patents (OSTI)

Method and apparatus to extract heat by transferring heat from hot compressed refrigerant to a coolant, such as water, without exceeding preselected temperatures in the coolant and avoiding boiling in a water system by removing the coolant from direct or indirect contact with the hot refrigerant.

Jardine, Douglas M. (Colorado Springs, CO)

1984-01-01T23:59:59.000Z

472

Development Methods for Web Services  

E-Print Network (OSTI)

Development Methods for Web Services Jakub Walaszczyk LYNGBY 2004 MSc THESIS NR. 52/2004 IMM #12.D. The project was focused in the area of Web Services. The final result was a successful implementation: a conceptual part, requiring research into the areas of Web Services and a practical part, involving

473

Professional Ethics, System Design Methods  

E-Print Network (OSTI)

Professional Ethics, System Design Methods and Geospatial Data Quality #12;Objectives #12;Geospatial Data Uncertainty and Ethics #12;Geospatial Data Uncertainty and Ethics #12;Geospatial Data Uncertainty and Ethics #12;Geospatial Data Uncertainty and Ethics #12;Geospatial Data Uncertainty and Ethics

Wright, Dawn Jeannine

474

Method for synthesizing carbon nanotubes  

DOE Patents (OSTI)

A method for preparing a precursor solution for synthesis of carbon nanomaterials, where a polar solvent is added to at least one block copolymer and at least one carbohydrate compound, and the precursor solution is processed using a self-assembly process and subsequent heating to form nanoporous carbon films, porous carbon nanotubes, and porous carbon nanoparticles.

Fan, Hongyou

2012-09-04T23:59:59.000Z

475

Additive manufacturing method of producing  

E-Print Network (OSTI)

Additive manufacturing method of producing silver or copper tracks on polyimide film Problem/stripping) using an additive process support by a novel bio- degradable photo-initiator package. technology. Building on previous work by Hoyd- Gigg Ng et al. [1,2], Heriot-Watt has developed an additive film

Painter, Kevin

476

Method-level bug prediction  

Science Journals Connector (OSTI)

Researchers proposed a wide range of approaches to build effective bug prediction models that take into account multiple aspects of the software development process. Such models achieved good prediction performance, guiding developers towards those parts ... Keywords: code metrics, fine-grained source code changes, method-level bug prediction

Emanuel Giger; Marco D'Ambros; Martin Pinzger; Harald C. Gall

2012-09-01T23:59:59.000Z

477

Grant Writing Using Qualitative Methods  

E-Print Network (OSTI)

Grant Writing Using Qualitative Methods Michael L. Hecht Distinguished Professor Communication Arts and Sciences Crime, Law, and Justice #12; Section 1: Grants Overview Section 2: Grant Criteria Section 3: Grant Writing Section 4: Grant Reviews & Revision Get Funded! (OK, write proposal) Workshop Outline

Omiecinski, Curtis

478

Method for producing a borohydride  

DOE Patents (OSTI)

A method for producing a borohydride is described and which includes the steps of providing a source of borate; providing a material which chemically reduces the source of the borate to produce a borohydride; and reacting the source of borate and the material by supplying heat at a temperature which substantially effects the production of the borohydride.

Kong, Peter C. (Idaho Falls, ID)

2008-09-02T23:59:59.000Z

479

GGNB Methods Courses 2012 -Overview Sep 2012 -Feb 2013 Short Methods Courses & Method Seminars; Extended Methods Course  

E-Print Network (OSTI)

fluorescence complementation) in yeast 1.0 Oct 2012 Jahn, Reinhard Chua, John / Binotti, Beyenech / Boyken-protein interactions in RNP complexes 1.0 23-25 Jan 2013 Görlich, Dirk Frey, Steffen A 131 Methods in bacterial protein expression and purification 0.5 18 Oct 2012 Görlich, Dirk Frey, Steffen A 132 Purification of recombinant

Gollisch, Tim

480

TRAC methods and models. [PWR  

SciTech Connect

The numerical methods and physical models used in the Transient Reactor Analysis Code (TRAC) versions PD2 and PF1 are discussed. Particular emphasis is placed on TRAC-PF1, the version specifically designed to analyze small-break loss-of-coolant accidents (LOCAs).

Mahaffy, J.H.; Liles, D.R.; Bott, T.F.

1981-01-01T23:59:59.000Z

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481

Method of forming ceramic bricks  

DOE Patents (OSTI)

A method for forming free standing ceramic bricks for use as tritium breeder material is disclosed. Aqueous solutions of sodium carbonate and potassium carbonate are mixed with an organic hydrocolloid dispersion and powdered lithium carbonate, spray dried, and ceramic bricks formed by molding in a die and firing.

Poeppel, R.B.; Claar, T.D.; Silkowski, P.

1987-04-22T23:59:59.000Z

482

Method of making monodisperse nanoparticles  

DOE Patents (OSTI)

A method of making particles of either spherical or cylindrical geometry with a characteristic diameter less than 50 nanometers by mixing at least one structure directing agent dissolved in a solvent with at least one amphiphilic block copolymer dissolved in a solvent to make a solution containing particles, where the particles can be subsequently separated and dispersed in a solvent of choice.

Fan, Hongyon; Sun, Zaicheng

2012-10-16T23:59:59.000Z

483

Methods of producing cermet materials and methods of utilizing same  

DOE Patents (OSTI)

Methods of fabricating cermet materials and methods of utilizing the same such as in filtering particulate and gaseous pollutants from internal combustion engines having intermetallic and ceramic phases. The cermet material may be made from a transition metal aluminide phase and an alumina phase. The mixture may be pressed to form a green compact body and then heated in a nitrogen-containing atmosphere so as to melt aluminum particles and form the cermet. Filler materials may be added to increase the porosity or tailor the catalytic properties of the cermet material. Additionally, the cermet material may be reinforced with fibers or screens. The cermet material may also be formed so as to pass an electrical current therethrough to heat the material during use.

Kong, Peter C. (Idaho Falls, ID)

2008-12-30T23:59:59.000Z

484

The Trojan Horse method for nuclear astrophysics: Recent results on resonance reactions  

SciTech Connect

Nuclear astrophysics aims to measure nuclear-reaction cross sections of astrophysical interest to be included into models to study stellar evolution and nucleosynthesis. Low energies, < 1 MeV or even < 10 keV, are requested for this is the window where these processes are more effective. Two effects have prevented to achieve a satisfactory knowledge of the relevant nuclear processes, namely, the Coulomb barrier exponentially suppressing the cross section and the presence of atomic electrons. These difficulties have triggered theoretical and experimental investigations to extend our knowledge down to astrophysical energies. For instance, indirect techniques such as the Trojan Horse Method have been devised yielding new cutting-edge results. In particular, I will focus on the application of this indirect method to resonance reactions. Resonances might dramatically enhance the astrophysical S(E)-factor so, when they occur right at astrophysical energies, their measurement is crucial to pin down the astrophysical scenario. Unknown or unpredicted resonances might introduce large systematic errors in nucleosynthesis models. These considerations apply to low-energy resonances and to sub-threshold resonances as well, as they may produce sizable modifications of the S-factor due to, for instance, destructive interference with another resonance.

Cognata, M. La; Pizzone, R. G. [Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Catania (Italy); Spitaleri, C.; Cherubini, S.; Romano, S. [Dipartimento di Fisica e Astronomia, Università di Catania, Catania, Italy and Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Catania (Italy); Gulino, M.; Tumino, A. [Kore University, Enna, Italy and Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Catania (Italy); Lamia, L. [Dipartimento di Fisica e Astronomia, Università di Catania, Catania (Italy)

2014-05-09T23:59:59.000Z

485

Explosives detection system and method  

DOE Patents (OSTI)

A method of detecting explosives in a vehicle includes providing a first rack on one side of the vehicle, the rack including a neutron generator and a plurality of gamma ray detectors; providing a second rack on another side of the vehicle, the second rack including a neutron generator and a plurality of gamma ray detectors; providing a control system, remote from the first and second racks, coupled to the neutron generators and gamma ray detectors; using the control system, causing the neutron generators to generate neutrons; and performing gamma ray spectroscopy on spectra read by the gamma ray detectors to look for a signature indicative of presence of an explosive. Various apparatus and other methods are also provided.

Reber, Edward L. (Idaho Falls, ID); Jewell, James K. (Idaho Falls, ID); Rohde, Kenneth W. (Idaho Falls, ID); Seabury, Edward H. (Idaho Falls, ID); Blackwood, Larry G. (Idaho Falls, ID); Edwards, Andrew J. (Idaho Falls, ID); Derr, Kurt W. (Idaho Falls, ID)

2007-12-11T23:59:59.000Z

486

Update on pipeline repair methods  

SciTech Connect

A comprehensive review of pipeline repair methods has been recently completed under the sponsorship of the American Gas Association`s, Pipeline Research Committee. This paper is intended to summarize the important results of that review. First and foremost, two relatively new methods of repair are reviewed. One involves the use of a continuous-fiber fiberglass composite material which can be applied as an alternative to a steel sleeve for the reinforcement of nonleaking defects. The second is the use of deposited weld metal to replace metal lost to external corrosion. This latter technique is not new in principle, but recent research has shown how it can be done safely on a pressurized pipeline. The other significant outcome of the comprehensive review was a set of guidelines for using all types of repairs including full-encirclement sleeves and repair clamps. Pipeline operators can use these guidelines to enhance their current repair procedures, or to train new personnel in maintenance techniques.

Kiefner, J.F. [Kiefner and Associates, Inc., Worthington, OH (United States); Bruce, W.A. [Edison Welding Inst., Columbus, OH (United States); Stephens, D.R. [Battelle, Columbus, OH (United States)

1995-12-31T23:59:59.000Z

487

Method for detecting toxic gases  

DOE Patents (OSTI)

A method is disclosed which is capable of detecting low concentrations of a pollutant or other component in air or other gas. This method utilizes a combination of a heating filament having a catalytic surface of a noble metal for exposure to the gas and producing a derivative chemical product from the component. An electrochemical sensor responds to the derivative chemical product for providing a signal indicative of the product. At concentrations in the order of about 1-100 ppm of tetrachloroethylene, neither the heating filament nor the electrochemical sensor is individually capable of sensing the pollutant. In the combination, the heating filament converts the benzyl chloride to one or more derivative chemical products which may be detected by the electrochemical sensor. 6 figures.

Stetter, J.R.; Zaromb, S.; Findlay, M.W. Jr.

1991-10-08T23:59:59.000Z

488

Monte Carlo methods in ICF  

SciTech Connect

Monte Carlo methods appropriate to simulate the transport of x-rays, neutrons, ion and electrons in Inertial Confinement Fusion targets are described and analyzed. The Implicit Monte Carlo method of x-ray transport handles symmetry within indirect drive ICF hohlraums well, but can be improved 50X in efficiency by angular biasing the x-rays towards the fuel capsule. Accurate simulation of thermonuclear burns nd burn diagnostics involves detailed particle source spectra, charged particle ranges, inflight reaction kinematics, corrections for bulk and thermal Doppler effects and variance reduction to obtain adequate statistics for rare events. It is found that the effects of angular Coulomb scattering must be included in models of charged particle transport through heterogeneous materials.

Zimmerman, G.B.

1997-06-24T23:59:59.000Z

489

Method of migrating seismic records  

DOE Patents (OSTI)

The present invention provides a method of migrating seismic records that retains the information in the seismic records and allows migration with significant reductions in computing cost. The present invention comprises phase encoding seismic records and combining the encoded seismic records before migration. Phase encoding can minimize the effect of unwanted cross terms while still allowing significant reductions in the cost to migrate a number of seismic records.

Ober, Curtis C. (Las Lunas, NM); Romero, Louis A. (Albuquerque, NM); Ghiglia, Dennis C. (Longmont, CO)

2000-01-01T23:59:59.000Z