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1

Isotopic abundance in atom trap trace analysis  

DOE Patents (OSTI)

A method and system for detecting ratios and amounts of isotopes of noble gases. The method and system is constructed to be able to measure noble gas isotopes in water and ice, which helps reveal the geological age of the samples and understand their movements. The method and system uses a combination of a cooled discharge source, a beam collimator, a beam slower and magneto-optic trap with a laser to apply resonance frequency energy to the noble gas to be quenched and detected.

Lu, Zheng-Tian; Hu, Shiu-Ming; Jiang, Wei; Mueller, Peter

2014-03-18T23:59:59.000Z

2

Atom Trap Trace Analysis at ANL | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Atom Trap Trace Analysis at ANL Atom Trap Trace Analysis at ANL Nuclear Physics (NP) NP Home About Research Facilities Science Highlights Benefits of NP Spinoff Applications Spinoff Archives SBIR/STTR Applications of Nuclear Science and Technology Funding Opportunities Nuclear Science Advisory Committee (NSAC) News & Resources Contact Information Nuclear Physics U.S. Department of Energy SC-26/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3613 F: (301) 903-3833 E: sc.np@science.doe.gov More Information » Spinoff Archives Atom Trap Trace Analysis at ANL Print Text Size: A A A RSS Feeds FeedbackShare Page Application/instrumentation: Atom Trap Trace Analysis (ATTA) to determine isotopic abundances. Developed at: Argonne National Laboratory Developed in: 1999-current

3

An atom trap trace analysis system for measuring krypton contamination in xenon dark matter detectors  

SciTech Connect

We have developed an atom trap trace analysis (ATTA) system to measure Kr in Xe at the part per trillion (ppt) level, a prerequisite for the sensitivity achievable with liquid xenon dark matter detectors beyond the current generation. Since Ar and Kr have similar laser cooling wavelengths, the apparatus has been tested with Ar to avoid contamination prior to measuring Xe samples. A radio-frequency plasma discharge generates a beam of metastable atoms which is optically collimated, slowed, and trapped using standard magneto-optical techniques. Based on the measured overall system efficiency of 1.2 × 10{sup ?8} (detection mode), we expect the ATTA system to reach the design goal sensitivity to ppt concentrations of Kr in Xe in <2 h.

Aprile, E.; Yoon, T.; Loose, A.; Goetzke, L. W.; Zelevinsky, T. [Department of Physics, Columbia University, New York, New York 10027-5255 (United States)] [Department of Physics, Columbia University, New York, New York 10027-5255 (United States)

2013-09-15T23:59:59.000Z

4

Trace Element Analysis | Open Energy Information  

Open Energy Info (EERE)

Trace Element Analysis Trace Element Analysis Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Trace Element Analysis Details Activities (8) Areas (8) Regions (4) NEPA(0) Exploration Technique Information Exploration Group: Lab Analysis Techniques Exploration Sub Group: Fluid Lab Analysis Parent Exploration Technique: Fluid Lab Analysis Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Reconstructing the fluid circulation of a hydrothermal system Thermal: Cost Information Low-End Estimate (USD): 15.001,500 centUSD 0.015 kUSD 1.5e-5 MUSD 1.5e-8 TUSD / element Median Estimate (USD): 18.001,800 centUSD 0.018 kUSD 1.8e-5 MUSD 1.8e-8 TUSD / element High-End Estimate (USD): 106.0010,600 centUSD 0.106 kUSD 1.06e-4 MUSD 1.06e-7 TUSD / element

5

Trace analysis of atmospheric organic bases  

E-Print Network (OSTI)

analysis of atmospheric organic bases were investigated; the study included (1) the analysis of submarine charcoal filter bed samples for nitrogen bases and (2) the use of metallic tetraphenylporphines (TPP) as specific adsorbents for atmospheric... gas chromatography (GC) and GC-mass spectrometry (GC-MS). The isolation procedure provided acceptable reproducibi lity in the determination of trace amounts of nitrogen bases in the submarine environment. Several metallic TPP adsorbents were...

Clark, Dwayne C.

2012-06-07T23:59:59.000Z

6

Procedure for Cleaning Bottles for Trace Metal Analysis Initial cleaning  

E-Print Network (OSTI)

Procedure for Cleaning Bottles for Trace Metal Analysis Initial cleaning: Supplies LDPE 60ml bottles (nalgene) ACS grade Hydrochloric acid Trace metal grade nitric acid Day 1 1. Submerge 60ml bottles for up to three uses) 2. Rinse 3x in milli-q (DI) water 3. Fill bottles with 2% trace metal grade nitric

Paytan, Adina

7

Electromagnetic two-dimensional analysis of trapped-ion eigenmodes  

SciTech Connect

A two-dimensional electromagnetic analysis of the trapped-ion instability for the tokamak case with ..beta.. not equal to 0 has been made, based on previous work in the electrostatic limit. The quasineutrality condition and the component of Ampere's law along the equilibrium magnetic field are solved for the perturbed electrostatic potential and the component of the perturbed vector potential along the equilibrium magnetic field. The general integro-differential equations are converted into a matrix eigenvalue-eigenfunction problem by expanding in cubic B-spline finite elements in the minor radius and in Fourier harmonics in the poloidal angle. A model MHD equilibrium with circular, concentric magnetic surfaces and large aspect ratio is used which is consistent with our assemption that B << 1. The effect on the trapped-ion mode of including these electromagnetic extensions to the calculation is considered, and the temperature (and ..beta..) scaling of the mode frequency is shown and discussed.

Kim, D.; Rewoldt, G.

1984-11-01T23:59:59.000Z

8

Desorption Electrospray Ionization Mass Spectrometry for Trace Analysis of Agrochemicals in Food  

Science Journals Connector (OSTI)

Desorption Electrospray Ionization Mass Spectrometry for Trace Analysis of Agrochemicals in Food ... Desorption electrospray ionization (DESI) is applied to the rapid, in situ, direct qualitative and quantitative (ultra)trace analysis of agrochemicals in foodstuffs. ... The results proved that DESI allows the detection and confirmation of traces of agrochemicals in actual market-purchased samples. ...

Juan F. García-Reyes; Ayanna U. Jackson; Antonio Molina-Díaz; R. Graham Cooks

2008-12-17T23:59:59.000Z

9

Computer analysis of holographic systems by means of vector ray tracing  

Science Journals Connector (OSTI)

This paper describes a computer program based on Welford's vector analysis approach capable of ray tracing through hybrid optical systems containing both conventional and diffractive...

Holloway, H W; Ferrante, R A

1981-01-01T23:59:59.000Z

10

Reasoning by Assumption: Formalisation and Analysis of Human Reasoning Traces  

E-Print Network (OSTI)

for the traces acquired in experiments undertaken. 1 Introduction Practical reasoning processes are often not limited to single reasoning steps, but extend to traces or trajectories of a number of interrelated by assumption'. This (non-deductive) practical reasoning pattern in- volves a number of interrelated reasoning

Treur, Jan

11

Trapped Ion Chain Thermometry and Mass Analysis Through Imaging  

E-Print Network (OSTI)

We demonstrate the temperature measurement of individual laser cooled ions in a linear Coulomb crystal by relating their imaged spatial extent along the linear Paul trap axis to the normal modes of vibration of coupled oscillators in a harmonic potential. We also use the thermal spatial spread of `bright' ions in the case of a two-species mixed chain to measure the secular resonance frequency of vibration of the center-of-mass mode of the entire chain and infer the molecular composition of the co-trapped `dark' ions. These techniques create new possibilities for better understanding of sympathetic cooling in mixed-ion chains and under conditions of non-uniform heat load, improving few-ion mass spectrometry, and making in-situ temperature measurements of individual trapped ions without requiring a scan over the Doppler cooling parameters.

V. Rajagopal; J. P. Marler; M. G. Kokish; B. C. Odom

2014-08-06T23:59:59.000Z

12

Trapped Ion Chain Thermometry and Mass Analysis Through Imaging  

E-Print Network (OSTI)

We demonstrate the temperature measurement of individual laser cooled ions in a linear Coulomb crystal by relating their imaged spatial extent along the linear Paul trap axis to the normal modes of vibration of coupled oscillators in a harmonic potential. We also use the thermal spatial spread of `bright' ions in the case of a two-species mixed chain to measure the secular resonance frequency of vibration of the center-of-mass mode of the entire chain and infer the molecular composition of the co-trapped `dark' ions. These techniques create new possibilities for better understanding of sympathetic cooling in mixed-ion chains and under conditions of non-uniform heat load, improving few-ion mass spectrometry, and making in-situ temperature measurements of individual trapped ions without requiring a scan over the Doppler cooling parameters.

Rajagopal, V; Kokish, M G; Odom, B C

2014-01-01T23:59:59.000Z

13

Statistical analysis of aerosol species, trace gasses, and meteorology in Chicago  

E-Print Network (OSTI)

possible pollutant sources. Keywords Atmospheric aerosols . Canonical correlation analysis . Chicago air pollution studies involve collection and anal- ysis of atmospheric aerosols and concurrent meteorol- ogy) and principal component analysis (PCA) were applied to atmospheric aerosol and trace gas concentrations

O'Brien, Timothy E.

14

Trace Element Analysis At Walker-Lane Transitional Zone Region (Coolbaugh,  

Open Energy Info (EERE)

Trace Element Analysis At Walker-Lane Transitional Zone Region (Coolbaugh, Trace Element Analysis At Walker-Lane Transitional Zone Region (Coolbaugh, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Walker-Lane Transitional Zone Region (Coolbaugh, Et Al., 2010) Exploration Activity Details Location Walker-Lane Transition Zone Geothermal Region Exploration Technique Trace Element Analysis Activity Date Usefulness useful DOE-funding Unknown Notes "This second paper provides more detailed documentation on water and rock geochemistries and describes diagnostic major and trace element ratios and concentrations that can be used to distinguish tufa columns formed from thermal waters from those that formed from non-thermal waters." "In addition to providing a potentially diagnostic lithogeochemical tool for

15

Trace Element Analysis At Nw Basin & Range Region (Coolbaugh, Et Al., 2010)  

Open Energy Info (EERE)

Trace Element Analysis At Nw Basin & Range Region (Coolbaugh, Et Al., 2010) Trace Element Analysis At Nw Basin & Range Region (Coolbaugh, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Nw Basin & Range Region (Coolbaugh, Et Al., 2010) Exploration Activity Details Location Northwest Basin and Range Geothermal Region Exploration Technique Trace Element Analysis Activity Date Usefulness useful DOE-funding Unknown Notes "This second paper provides more detailed documentation on water and rock geochemistries and describes diagnostic major and trace element ratios and concentrations that can be used to distinguish tufa columns formed from thermal waters from those that formed from non-thermal waters." "In addition to providing a potentially diagnostic lithogeochemical tool for

16

Qualitative analysis of trapped Dirac fermions in graphene  

E-Print Network (OSTI)

We study the confinement of Dirac fermions in graphene and in carbon nanotubes by an external magnetic field, mechanical deformations or inhomogeneities in the substrate. By applying variational principles to the square of the Dirac operator, we obtain sufficient and necessary conditions for confinement of the quasi-particles. The rigorous theoretical results are illustrated on the realistic examples of the three classes of traps.

Vit Jakubsky; David Krejcirik

2014-05-11T23:59:59.000Z

17

Qualitative analysis of trapped Dirac fermions in graphene  

E-Print Network (OSTI)

We study the confinement of Dirac fermions in graphene and in carbon nanotubes by an external magnetic field, mechanical deformations or inhomogeneities in the substrate. By applying variational principles to the square of the Dirac operator, we obtain sufficient and necessary conditions for confinement of the quasi-particles. The rigorous theoretical results are illustrated on the realistic examples of the three classes of traps.

Vit Jakubsky; David Krejcirik

2015-01-07T23:59:59.000Z

18

Trace Element Analysis At Socorro Mountain Area (Owens, Et Al., 2005) |  

Open Energy Info (EERE)

Trace Element Analysis At Socorro Mountain Area (Owens, Et Al., 2005) Trace Element Analysis At Socorro Mountain Area (Owens, Et Al., 2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Socorro Mountain Area (Owens, Et Al., 2005) Exploration Activity Details Location Socorro Mountain Area Exploration Technique Trace Element Analysis Activity Date Usefulness not indicated DOE-funding Unknown Notes In order to determine which of the faults in these regions were active and open to hydrothermal fluid circulation, we have employed selective ion geochemistry that is a new geochemical method capable of detecting anomalous concentrations for up to 47 elements transported to soils by geochemical cells or low pressure vapors. Enzyme leach and Terrasol leach are two such techniques. This method has to datae been mostly applied to

19

Realistic Performance Analysis of WSN Protocols Through Trace Based Simulation  

E-Print Network (OSTI)

. Generic network simulators are often used, but they tend to rely on synthetic models. Because WSN enable trace based WSN simulation by first enhancing an existing WSN profiler that automates. These include simulation area, node density, radio model, noise model, etc. These parameters are used

Han, Qi "Chee"

20

Trace Environmental Quantitative Analysis: Principles, Techniques and Applications, 2nd  

E-Print Network (OSTI)

, California State UniVersity, Los Angeles JA0599418 10.1021/ja0599418 CRC Handbook of Chemistry and Physics and field- based techniques. Loconto's book does a superlative job of introducing the concept of trace edition of this famous handbook continues to provide up-to-date, critically evaluated chemical

Zubarev, Eugene

Note: This page contains sample records for the topic "trap trace analysis" 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

Trace determination of lead by helium-4 activation analysis  

E-Print Network (OSTI)

glass samples doped with 61 different trace elements at nominal 500 to 1 ppm level concentrations. We evaluated the measurement sensitivities of two methods for alpha counting, i. e. , surface barrier detector and nuclear track detectors. Detection.... An automated system synchronized irradiation, solenoid operation, and data acquisition. Prior to irradiation, the solenoid was energized to position the aluminum sheet in front of the detector. The cyclotron's beam pulser system then began irradiation...

Vargas Bernal, Maria E.

2012-06-07T23:59:59.000Z

22

Trace Element Analysis At Central Nevada Seismic Zone Region (Coolbaugh, Et  

Open Energy Info (EERE)

Coolbaugh, Et Coolbaugh, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Central Nevada Seismic Zone Region (Coolbaugh, Et Al., 2010) Exploration Activity Details Location Central Nevada Seismic Zone Geothermal Region Exploration Technique Trace Element Analysis Activity Date Usefulness useful DOE-funding Unknown Notes "This second paper provides more detailed documentation on water and rock geochemistries and describes diagnostic major and trace element ratios and concentrations that can be used to distinguish tufa columns formed from thermal waters from those that formed from non-thermal waters." "In addition to providing a potentially diagnostic lithogeochemical tool for geothermal exploration, the analysis of lithium and other elements in tufa

23

GC Analysis of Human Breath with A Series-Coupled Column Ensemble and A Multibed Sorption Trap  

Science Journals Connector (OSTI)

The combination of a tandem column ensemble and an on-line microsorption trap is used for the analysis of organic compounds in human breath samples. The four-bed sorption trap uses a series of discreet sorption beds containing three grades of graphitized ...

Juan M. Sanchez; Richard D. Sacks

2003-04-10T23:59:59.000Z

24

Trace Element Analysis At Roosevelt Hot Springs Area (Christensen, Et Al.,  

Open Energy Info (EERE)

Christensen, Et Al., Christensen, Et Al., 1983) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Roosevelt Hot Springs Area (Christensen, Et Al., 1983) Exploration Activity Details Location Roosevelt Hot Springs Area Exploration Technique Trace Element Analysis Activity Date Usefulness useful DOE-funding Unknown Notes Three of the recognized trace-element suites are characteristic of the surface and near-surface environment. These are: (1) concentrations of As, Sb, Be and Hg associated with siliceous material at the location of liquid discharge, fluid mixing, or at boiling interfaces; (2) deposits of Mn and Fe oxides containing concentrations of Ba, W, Be, Co, Cu, As, Sb and Hg formed by the oxidation of cooled brines; and (3) high concentrations of Hg

25

Trace Element Analysis At Northern Basin & Range Region (Coolbaugh, Et Al.,  

Open Energy Info (EERE)

At Northern Basin & Range Region (Coolbaugh, Et Al., At Northern Basin & Range Region (Coolbaugh, Et Al., 2010) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Northern Basin & Range Region (Coolbaugh, Et Al., 2010) Exploration Activity Details Location Northern Basin and Range Geothermal Region Exploration Technique Trace Element Analysis Activity Date Usefulness useful DOE-funding Unknown Notes "This second paper provides more detailed documentation on water and rock geochemistries and describes diagnostic major and trace element ratios and concentrations that can be used to distinguish tufa columns formed from thermal waters from those that formed from non-thermal waters." "In addition to providing a potentially diagnostic lithogeochemical tool for

26

TRACE/PARCS Core Modeling of a BWR/5 for Accident Analysis of ATWS Events  

SciTech Connect

The TRACE/PARCS computational package [1, 2] isdesigned to be applicable to the analysis of light water reactor operational transients and accidents where the coupling between the neutron kinetics (PARCS) and the thermal-hydraulics and thermal-mechanics (TRACE) is important. TRACE/PARCS has been assessed for itsapplicability to anticipated transients without scram(ATWS) [3]. The challenge, addressed in this study, is to develop a sufficiently rigorous input model that would be acceptable for use in ATWS analysis. Two types of ATWS events were of interest, a turbine trip and a closure of main steam isolation valves (MSIVs). In the first type, initiated by turbine trip, the concern is that the core will become unstable and large power oscillations will occur. In the second type,initiated by MSIV closure,, the concern is the amount of energy being placed into containment and the resulting emergency depressurization. Two separate TRACE/PARCS models of a BWR/5 were developed to analyze these ATWS events at MELLLA+ (maximum extended load line limit plus)operating conditions. One model [4] was used for analysis of ATWS events leading to instability (ATWS-I);the other [5] for ATWS events leading to emergency depressurization (ATWS-ED). Both models included a large portion of the nuclear steam supply system and controls, and a detailed core model, presented henceforth.

Cuadra A.; Baek J.; Cheng, L.; Aronson, A.; Diamond, D.; Yarsky, P.

2013-11-10T23:59:59.000Z

27

Trace Element Analysis At Long Valley Caldera Area (Klusman & Landress,  

Open Energy Info (EERE)

Klusman & Landress, Klusman & Landress, 1979) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Trace Element Analysis At Long Valley Caldera Area (Klusman & Landress, 1979) Exploration Activity Details Location Long Valley Caldera Area Exploration Technique Trace Element Analysis Activity Date Usefulness useful DOE-funding Unknown Notes This study involved the field collection and laboratory analysis of Al-horizon soil samples in the vicinity of a known geothermal source at Long Valley, California. The samples were analyzed for several constituents known to have influence on Hg retention by soils, including pH, hydrous Fe and Mn, and organic carbon, as well as Hg. The data compiled for these secondary parameters and the field-determined parameters of geology, soil

28

Application of synchrotron radiation to x-ray fluorescence analysis of trace elements  

SciTech Connect

The development of synchrotron radiation x-ray sources has provided the means to greatly extend the capabilities of x-ray fluorescence analysis for determinations of trace element concentrations. A brief description of synchrotron radiation properties provides a background for a discussion of the improved detection limits compared to existing x-ray fluorescence techniques. Calculated detection limits for x-ray microprobes with micrometer spatial resolutions are described and compared with experimental results beginning to appear from a number of laboratories. The current activities and future plans for a dedicated x-ray microprobe beam line at the National Synchrotron Light Source (NSLS) of Brookhaven National Laboratory are presented.

Gordon, B.M.; Jones, K.W.; Hanson, A.L.

1986-08-01T23:59:59.000Z

29

Analysis of mineral trapping for CO2 disposal in deep aquifers  

E-Print Network (OSTI)

of Mineral Trapping for CO2 Disposal in Deep Aquifers Tianfue~mail: Tianfu Xu@lbl. gov) CO2 disposal into deep aquiferspermit significant sequestration of CO2. We performed batch

Xu, Tianfu

2014-01-01T23:59:59.000Z

30

Carbon dioxide Information Analysis Center and World Data Center: A for Atmospheric trace gases. Annual progress report, FY 1994  

SciTech Connect

This report summarizes the activities and accomplishments made by the Carbon Dioxide Information Analysis Center and World Data Center-A for Atmospheric Trace Gases during the fiscal year 1994. Topics discussed in this report include; organization and staff, user services, systems, communications, Collaborative efforts with China, networking, ocean data and activities of the World Data Center-A.

Burtis, M.D. [comp.] [Tennessee Univ., Knoxville, TN (United States). Energy, Environment and Resources Center; Cushman, R.M.; Boden, T.A.; Jones, S.B.; Nelson, T.R.; Stoss, F.W. [Oak Ridge National Lab., TN (United States)

1995-03-01T23:59:59.000Z

31

detonation trap  

Science Journals Connector (OSTI)

detonation trap [It prevents a detonation initiated in one part of a system...] ? Detonationsfang m, Detonationsfänger m

2014-08-01T23:59:59.000Z

32

Trace, isotopic analysis of micron-sized grains -- Mo, Zr analysis of stardust (SiC and graphite grains).  

SciTech Connect

Secondary Neutral Mass Spectrometry using resonant laser ionization can provide for both high useful yields and high discrimination while maintaining high lateral and depth resolutions. An example of the power of the method is measurement of the isotopic composition of Mo and Zr in 1-5 {micro}m presolar SiC and graphite grains isolated from the Murchison CM2 meteorite for the first time. These grains have survived the formation of the Solar System and isotopic analysis reveals a record of the stellar nucleosynthesis present during their formation. Mo and Zr, though present at less than 10 ppm in some grains, are particularly useful in that among their isotopes are members that can only be formed by distinct nucleosynthetic processes known as s-, p-, and r-process. Successful isotopic analysis of these elements requires both high selectivity (since these are trace elements) and high efficiency (since the total number of atoms available are limited). Resonant Ionization Spectroscopy is particularly useful and flexible in this application. While the sensitivity of this t.edmique has often been reported in the past, we focus hereon the very low noise properties of the technique. We further demonstrate the efficacy of noise removal by two complimentary methods. First we use the resonant nature of the signal to subtract background signal. Second we demonstrate that by choosing the appropriate resonance scheme background can often be dramatically reduced.

Pellin, M. J.; Nicolussi, G. K.

1998-02-19T23:59:59.000Z

33

Analysis of Mineral Trapping for CO2 Disposal in Deep Aquifers  

Office of Scientific and Technical Information (OSTI)

Reactive Geochemical Transport Simulation to Study Mineral Trapping Reactive Geochemical Transport Simulation to Study Mineral Trapping for CO 2 Disposal in Deep Saline Arenaceous Aquifers Tianfu Xu, John A. Apps, and Karsten Pruess Earth Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA Abstract. A reactive fluid flow and geochemical transport numerical model for evaluating long-term CO 2 disposal in deep aquifers has been developed. Using this model, we performed a number of sensitivity simulations under CO 2 injection conditions for a commonly encountered Gulf Coast sediment to analyze the impact of CO 2 immobilization through carbonate precipitation. Geochemical models are needed because alteration of the predominant host rock aluminosilicate minerals is very slow and is not

34

Atmospheric Trace Gases from the Carbon Dioxide Information Analysis Center (CDIAC)  

DOE Data Explorer (OSTI)

CDIAC products are indexed and searchable through a customized interface powered by ORNL's Mercury search engine. Products include numeric data packages, publications, trend data, atlases, models, etc. and can be searched for by subject area, keywords, authors, product numbers, time periods, collection sites, spatial references, etc. Some of the collections may also be included in the CDIAC publication, Trends Online: A Compendium of Global Change Data. Most data sets, many with numerous data files, are free to download from CDIAC's ftp area. The collections under the CDIAC heading of Atmospheric Trace Gases include: Atmospheric Carbon Dioxide, Atmospheric Methane, Atmospheric Carbon Monoxide, Atmospheric Hydrogen, Isotopes in Greenhouse Gases, Radionuclides, Aerosols, and Other Trace Gases.

35

Batch methods for enriching trace impurities in hydrogen gas for their further analysis  

DOE Patents (OSTI)

Provided herein are batch methods and devices for enriching trace quantities of impurities in gaseous mixtures, such as hydrogen fuel. The methods and devices rely on concentrating impurities using hydrogen transport membranes wherein the time period for concentrating the sample is calculated on the basis of optimized membrane characteristics, comprising its thickness and permeance, with optimization of temperature, and wherein the enrichment of trace impurities is proportional to the pressure ratio P.sub.hi/P.sub.lo and the volume ratio V.sub.1/V.sub.2, with following detection of the impurities using commonly-available detection methods.

Ahmed, Shabbir; Lee, Sheldon H.D.; Kumar, Romesh; Papdias, Dionissios D.

2014-07-15T23:59:59.000Z

36

Reasoning by Assumption: Formalisation and Analysis of Human Reasoning Traces Tibor Bosse  

E-Print Network (OSTI)

undertaken. 1. Introduction Practical reasoning processes are often not limited to single reasoning steps, but extend to traces or trajectories of a number of interrelated reasoning steps over time. This paper-deductive) practical reasoning pattern involves a number of interrelated reasoning steps, and uses in its reasoning

Bosse, Tibor

37

Trapping Coyotes  

E-Print Network (OSTI)

Coyotes cause millions of dollars of damage yearly to livestock and crops in Texas. The leaflet explains coyote habits and the types of trap set, such as scent posts, dirt holes, and trail and carcass sets. The variety of traps available and how...

Texas Wildlife Services

2008-04-15T23:59:59.000Z

38

Safety analysis report for packaging: the ORNL DOT specification 6M - tritium trap package. [Tritium absorbed as solid uranium tritide in depleted uranium trap  

SciTech Connect

The ORNL DOT Specification 6M--Tritium Trap Package was fabricated at the Oak Ridge National Laboratory (ORNL) for the transport of Type B quantities of tritium as solid uranium tritide. The package was evaluated on the basis of tests performed by the Dow Chemical Company, Rocky Flats Division, on the DOT-6M container, a drop test performed by the ORNL Operations Division, and International Atomic Energy Agency (IAEA) approvals on a similar tritium transport container. The results of these evaluations demonstrate that the package is in compliance with the applicable regulations for the transport of Type B quantities of tritium. 4 references, 8 figures.

DeVore, J.R.

1984-04-01T23:59:59.000Z

39

Counting Individual Ca41 Atoms with a Magneto-Optical Trap  

Science Journals Connector (OSTI)

Atom trap trace analysis, a novel method based upon laser trapping and cooling, is used to count individual atoms of Ca41 present in biomedical samples with isotopic abundance levels between 10-8 and 10-10. The method is calibrated against resonance ionization mass spectrometry, demonstrating good agreement between the two methods. The present system has a counting efficiency of 2×10-7. Within 1 h of observation time, its 3-? detection limit on the isotopic abundance of Ca41 reaches 4.5×10-10.

I. D. Moore; K. Bailey; J. Greene; Z.-T. Lu; P. Müller; T. P. O’Connor; Ch. Geppert; K. D. A. Wendt; L. Young

2004-04-14T23:59:59.000Z

40

On the determination of trace elements in cocoa and coffee by instrumental neutron activation analysis  

E-Print Network (OSTI)

. Charlene Helton for her helpful and productive suggestions, and, of course, for undertaking the laborious task or. typing the final manuscript. DEDICATION To mv parents. TABLE OF CONTENTS Chapter ~Pa e INTRODUCTION THEORY Neutron Activation..., commercial cocoa. CHAPTER II THEORY Neutron Activation Analysis Neutron Activation Analysis was proposed by Von Hevesy and Levi in 1936 (32). hey irradiated a yttrium sample with neutrons from a radium-beryllium source and determined the im urity...

Adanuvor, Prosper Kwasi

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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

An Improved Trace Analysis for N-Nitrosoureas from Biological Media  

Science Journals Connector (OSTI)

......Massachusetts General Hospital/Harvard Medical School, 5 Emerson Place, Boston, Massachusetts...room temperature, under special yellow lighting, in order to prevent any artificial loss...requirements, as well as manpower and overall cost per analysis. It is hoped that in the......

I.S. Krull; J. Strauss; F. Hochberg; N.T. Zervas

1981-01-01T23:59:59.000Z

42

Interaction of trapped ions with trapped atoms  

E-Print Network (OSTI)

In this thesis, I present results from two Paul-trap based ion traps carried out in the Vuleti? laboratory: the Atom-Ion trap for collision studies between cold atoms and cold ions, and the Cavity-Array trap for studying ...

Grier, Andrew T. (Andrew Todd)

2011-01-01T23:59:59.000Z

43

Determination of selected trace elements in human head hair by neutron activation analysis  

E-Print Network (OSTI)

the scope of this discussion. The final category of data contains barium and strontium. There was no data in the literature to use as a comparison, therefore the values of 49 ppm for barium and 87 ppm for strontium must stand on their own merit...) in Japan and of course, the current work in Texas. The results of the correlation analysis were that there were no significant correlations between any of the elements except in the case of strontium and barium which yielded a Pearson correlation coef...

Courson, Leonard Austin

2012-06-07T23:59:59.000Z

44

Photoionization cross-section analysis for a deep trap contributing to current collapse in GaN field-effect transistors  

Science Journals Connector (OSTI)

We perform a more incisive numerical analysis of the photon energy dependence of the photoionization cross section of a prominent deep trap (conventionally labeled as Trap 1) which had been found [Klein et al. Appl. Phys. Lett. 75 4016 (1999)] to act as a contributor to current collapse phenomena in GaN metal-semiconductor field-effect transistors. The analytical expression for the photoionization cross section of Trap 1 is taken in the form of a convolution of a temperature-independent electronic part with a thermally broadened Franck–Condon (FC) factor which also applies to the relevant regime of large lattice relaxation. For a direct comparison with earlier results we specialize the present analysis to an electronic cross-section part represented by the Lucovsky model in combination with the semiclassical (Gaussian) approximation for the FC factor. In qualitative accordance with an earlier estimation by Klein et al. we obtain a value of E O ?1.9? eV for the classical opticalionization energy in combination with a full width at half maximum of 0.64 eV. The latter implies on the assumption for the average phonon energy to be of order 50 meV an apparently unusually large magnitude D?1.1? eV for the Franck–Condon shift. This parameter constellation is equivalent to a thermal ionization (electron binding) energy E T =E O ?D of about E T ?0.8 eV. Such a location of Trap 1 near the middle of the upper half of the fundamental gap of GaN E T ?E g /4 is at clear variance to the earlier suggestion by Klein et al. for Trap 1 to be a midgap level. The present estimation offers a chance for detecting the Trap 1 also by deep-level transient spectroscopy measurements. An eventual availability of photoionization cross-section data for different temperatures is seen to be the prerequisite for a decisive reduction of residual uncertainties concerning the configuration coordinate diagram.

Roland Pässler

2004-01-01T23:59:59.000Z

45

Comparative Cost Analysis of Alternative Animal Tracing Strategies Directed Toward Foot and Mouth Disease Outbreaks in the Texas High Plains  

E-Print Network (OSTI)

with animal ID, then there are specific manufacturers that produce AIN devices including visual tags, RFID tags, and injectable transponders. The last step for NAIS is animal tracing. Animal tracking databases (ATD) that are maintained by the states...

Looney, John C.

2010-07-14T23:59:59.000Z

46

Multi-physics coupled code reactor analysis with the U.S. NRC code system TRACE/PARCS  

SciTech Connect

This paper will focus on the PARCS code and some of the recent applications of the coupled TRACE/PARCS codes to OECD LWR benchmarks and to the Advanced CANDU Reactor, the ACR-700. (authors)

Xu, Y.; Downar, T.; Ward, A. [Purdue Univ. (United States); Kozlowski, T. [KTH, Nuclear Power Safety (Sweden); Ivanov, K. [Penn State Univ. (United States)

2006-07-01T23:59:59.000Z

47

Regional-scale chemical transport modeling in support of the analysis of observations obtained during the TRACE-P experiment  

E-Print Network (OSTI)

during the TRACE-P experiment G. R. Carmichael,1 Y. Tang,1 G. Kurata,3 I. Uno,2 D. Streets,4 J.-H. Woo,1 H. Huang,1 J. Yienger,1 B. Lefer,5 R. Shetter,5 D. Blake,6 E. Atlas,5 A. Fried,5 E. Apel,5 F. Eisele the TRACE-P experiment is used to evaluate how well the CFORS/STEM-2K1 regional-scale chemical transport

Clarke, Antony

48

Stratospheric and mesospheric pressure-temperature profiles from rotational analysis of CO2 lines in atmospheric trace molecule spectroscopy/ATLAS 1 infrared solar occultation spectra  

SciTech Connect

A simple, classical, and expedient method for the retrieval of atmospheric pressure-temperature profiles has been applied to the high-resolution infrared solar absorption spectra obtained with the atmospheric trace molecule spectroscopy (ATMOS) instrument. The basis for this method is a rotational analysis of retrieved apparent abundances from CO2 rovibrational absorption lines, employing existing constituent concentration retrieval software used in the analysis of data returned by ATMOS. Pressure-temperature profiles derived from spectra acquired during the ATLAS 1 space shuttle mission of March-April 1992 are quantitatively evaluated and compared with climatological and meteorological data as a means of assessing the validity of this approach.

Stiller, G.P.; Gunson, M.R.; Lowes, L.L.; Abrams, M.C.; Raper, O.F.; Farmer, C.B.; Zander, R.; Rinsland, C.P. [Kernforschungszentrum Karlsruhe, Karlsruhe (Germany)] [Kernforschungszentrum Karlsruhe, Karlsruhe (Germany); [Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA (United States); [Liege Univ., Liege (Belgium); [NASA, Langley Research Center, Hampton, VA (United States)

1995-02-01T23:59:59.000Z

49

Thermodynamic analysis of interactions between Ni-based solid oxide fuel cells (SOFC) anodes and trace species in a survey of coal syngas  

SciTech Connect

A thermodynamic analysis was conducted to characterize the effects of trace contaminants in syngas derived from coal gasification on solid oxide fuel cell (SOFC) anode material. The effluents from 15 different gasification facilities were considered to assess the impact of fuel composition on anode susceptibility to contamination. For each syngas case, the study considers the magnitude of contaminant exposure resulting from operation of a warm gas cleanup unit at two different temperatures and operation of a nickel-based SOFC at three different temperatures. Contaminant elements arsenic (As), phosphorous (P), and antimony (Sb) are predicted to be present in warm gas cleanup effluent and will interact with the nickel (Ni) components of a SOFC anode. Phosphorous is the trace element found in the largest concentration of the three contaminants and is potentially the most detrimental. Poisoning was found to depend on the composition of the syngas as well as system operating conditions. Results for all trace elements tended to show invariance with cleanup operating temperature, but results were sensitive to syngas bulk composition. Synthesis gas with high steam content tended to resist poisoning.

Andrew Martinez; Kirk Gerdes; Randall Gemmen; James Postona

2010-03-20T23:59:59.000Z

50

Microfabricated Ion Traps  

E-Print Network (OSTI)

Ion traps offer the opportunity to study fundamental quantum systems with high level of accuracy highly decoupled from the environment. Individual atomic ions can be controlled and manipulated with electric fields, cooled to the ground state of motion with laser cooling and coherently manipulated using optical and microwave radiation. Microfabricated ion traps hold the advantage of allowing for smaller trap dimensions and better scalability towards large ion trap arrays also making them a vital ingredient for next generation quantum technologies. Here we provide an introduction into the principles and operation of microfabricated ion traps. We show an overview of material and electrical considerations which are vital for the design of such trap structures. We provide guidance in how to choose the appropriate fabrication design, consider different methods for the fabrication of microfabricated ion traps and discuss previously realized structures. We also discuss the phenomenon of anomalous heating of ions within ion traps, which becomes an important factor in the miniaturization of ion traps.

Marcus D. Hughes; Bjoern Lekitsch; Jiddu A. Broersma; Winfried K. Hensinger

2011-06-28T23:59:59.000Z

51

CGC Trace Species Partitioning  

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

Trace Species Partitioning as Affected Trace Species Partitioning as Affected by Cold Gas Cleanup Conditions: A Thermodynamic Analysis February 10, 2011 DOE/NETL-2011/1503 T r ace Species P ar titioning at C old G as C leanup C onditions Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name,

52

Trapped Inflation  

SciTech Connect

We analyze a distinctive mechanism for inflation in which particle production slows down a scalar field on a steep potential, and show how it descends from angular moduli in string compactifications. The analysis of density perturbations - taking into account the integrated effect of the produced particles and their quantum fluctuations - requires somewhat new techniques that we develop. We then determine the conditions for this effect to produce sixty e-foldings of inflation with the correct amplitude of density perturbations at the Gaussian level, and show that these requirements can be straightforwardly satisfied. Finally, we estimate the amplitude of the non-Gaussianity in the power spectrum and find a significant equilateral contribution.

Green, Daniel; Horn, Bart; /SLAC /Stanford U., Phys. Dept.; Senatore, Leonardo; /Princeton, Inst. Advanced Study /Harvard U., Phys. Dept. /Harvard-Smithsonian Ctr. Astrophys.; Silverstein, Eva; /SLAC /Stanford U., Phys. Dept.

2009-06-19T23:59:59.000Z

53

REVIEW ARTICLE Optical trapping  

E-Print Network (OSTI)

REVIEW ARTICLE Optical trapping Keir C. Neuman and Steven M. Blocka) Department of Biological ago, optical traps have emerged as a powerful tool with broad-reaching applications in biology--and the measurement of nanometer-level displacements of--optically trapped objects. We review progress

Block, Steven

54

Neutral atom traps.  

SciTech Connect

This report describes progress in designing a neutral atom trap capable of trapping sub millikelvin atom in a magnetic trap and shuttling the atoms across the atom chip from a collection area to an optical cavity. The numerical simulation and atom chip design are discussed. Also, discussed are preliminary calculations of quantum noise sources in Kerr nonlinear optics measurements based on electromagnetically induced transparency. These types of measurements may be important for quantum nondemolition measurements at the few photon limit.

Pack, Michael Vern

2008-12-01T23:59:59.000Z

55

Advanced Gasification Mercury/Trace Metal Control With Monolith Traps  

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

Gasification Technologies Gasification Technologies CONTACTS Jenny Tennant Technology/Project Manager National Energy Technology Laboratory 3610 Collins Ferry Road P.O. Box 880, Morgantown, WV 26507-0880 304-285-4830 jenny.tennant@netl.doe.gov Michael Swanson Principal Investigator University of North Dakota Energy and Environmental Research Center 15 North 23rd Street Grand Forks, ND 58202 701-777-5239 MSwanson@undeerc.org PARTNERS Corning, Inc. PROJECT DURATION

56

Structural traps I, tectonic fold traps  

SciTech Connect

This book contains studies of fields that exist because of the presence of an anticline; without the anticline there would be no trap. The fields described in this volume illustrate the complex nature of a trap type that some explorationists mistakenly regard as simple and therefore not worthy of close scrutiny. Anticlinal traps are like all other fields - each has its own peculiar personality. Many of the fields in this volume are sourced from continentally derived organic matter. All have sandstone reservoirs. Most have shale seals, but one, Sarir, has an evaporite seal. Many are faulted anticlines. Some of the anticlines formed in a compressional tectonic setting, whereas others formed in a tensional tectonic setting.

Beaumont, E.A.; Foster, N.H.

1990-01-01T23:59:59.000Z

57

Energy Savings Through Steam Trap Management  

E-Print Network (OSTI)

Energy Savings through Steam Trap Management Chris Gibbs, Account Manager, Armstrong International, Inc., Three Rivers, MI ESL-IE-08-05-08 Proceedings from theThirtieth Industrial Energy Technology Conference...-based steam trap management application developed by Armstrong International. The application calculates steam loss, fuel loss, dollar loss and CO 2 emission generation. The database allows for trend analysis, automatic energy report generation...

Gibbs, C.

2008-01-01T23:59:59.000Z

58

Prompt gamma-ray neutron activation analysis methodology for determination of boron from trace to major contents  

Science Journals Connector (OSTI)

Prompt gamma ray neutron activation analysis (PGNAA) is an isotope specific online nuclear analytical technique for non-destructive determination of elements in diverse matrices [1–5...]. Though in principle all ...

R. Acharya

2009-08-01T23:59:59.000Z

59

Trace Analysis of Polar Pharmaceuticals in Wastewater by LC-MS-MS: Comparison of Membrane Bioreactor and Activated Sludge Systems  

Science Journals Connector (OSTI)

......Analysis of Polar Pharmaceuticals in Wastewater by LC-MS-MS: Comparison...compounds in three different wastewater recycling schemes in Australia. Chemosphere...fields irrigated with treated wastewater. J. Agric. Food. Chem. 53......

Mary Dawn Celiz; Sandra Pérez; Damià Barceló; Diana S. Aga

2009-01-01T23:59:59.000Z

60

Nonlinear integrable ion traps  

SciTech Connect

Quadrupole ion traps can be transformed into nonlinear traps with integrable motion by adding special electrostatic potentials. This can be done with both stationary potentials (electrostatic plus a uniform magnetic field) and with time-dependent electric potentials. These potentials are chosen such that the single particle Hamilton-Jacobi equations of motion are separable in some coordinate systems. The electrostatic potentials have several free adjustable parameters allowing for a quadrupole trap to be transformed into, for example, a double-well or a toroidal-well system. The particle motion remains regular, non-chaotic, integrable in quadratures, and stable for a wide range of parameters. We present two examples of how to realize such a system in case of a time-independent (the Penning trap) as well as a time-dependent (the Paul trap) configuration.

Nagaitsev, S.; /Fermilab; Danilov, V.; /SNS Project, Oak Ridge

2011-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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.


61

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Vibration Electron Trapping by Molecular Vibration Print Wednesday, 27 April 2005 00:00 In photoelectron spectroscopy experiments performed at the...

62

The Use of Explanations in Knowledge-Based Systems: Cognitive Perspectives and a Process-Tracing Analysis  

Science Journals Connector (OSTI)

This exploratory research investigates the nature of explanation use and factors that influence it during users' interaction with a knowledge-based system (KBS) for decision-making. It draws upon several cognitive perspectives to help understand when, ... Keywords: Explanations Explanations In Expert Systems Knowledge Based Systems Verbal Protocol Analysis

Ji-Ye Mao; Izak Benbasat

2000-08-01T23:59:59.000Z

63

Evaluating Steam Trap Performance  

E-Print Network (OSTI)

~LmT " TRIf' 1 TRIf' 2 Figure 2 It has become common practice for engineers to oversize steam traps and place more emphasis on first cost than on maintenance cost and operating 766 3 4 ESL-IE-86-06-126 Proceedings from the Eighth Annual Industrial...EVALUATING STEAM TRAP PERFORMANCE Noel Y Fuller, P.E. Holston Defense Corporation Kingsport, Tennessee ABSTRACT Laboratory tests were conducted on several types of steam traps at Holston Defense Corporation in Kingsport, Tennessee. Data...

Fuller, N. Y.

64

TRAPping Modelica with Python  

Science Journals Connector (OSTI)

This short paper introduces TRAP, a small but powerful compiler development system based on the object-oriented, dynamic language Python. Employing a very high level language as a compiler tool’s base language re...

Thilo Ernst

1999-01-01T23:59:59.000Z

65

Trapping and Probing Antihydrogen  

SciTech Connect

Precision spectroscopy of antihydrogen is a promising path to sensitive tests of CPT symmetry. The most direct route to achieve this goal is to create and probe antihydrogen in a magnetic minimum trap. Antihydrogen has been synthesized and trapped for 1000s at CERN by the ALPHA Collaboration. Some of the challenges associated with achieving these milestones will be discussed, including mixing cryogenic positron and antiproton plasmas to synthesize antihydrogen with kinetic energy less than the trap potential of .5K. Recent experiments in which hyperfine transitions were resonantly induced with microwaves will be presented. The opportunity for gravitational measurements in traps based on detailed studies of antihydrogen dynamics will be described. The talk will conclude with a discussion future antihydrogen research that will use a new experimental apparatus, ALPHA-I.

Wurtele, Jonathan [UC Berkeley and LBNL

2013-03-27T23:59:59.000Z

66

Structural traps 5  

SciTech Connect

This book contains studies of oil and gas fields that are mainly structural in nature. Stratigraphy controls the extend of the reservoir in the traps of several fields, but overall, the main trapping features within the group of fields in this volume are structural. Fields covered in this volume include: Endicott Field, Point Arguello Field, West Puerto Chiquito Field, Dukhan Field, Sendji Field, Ruston Field, Raudhatain Field, Hassi Messaoud Field, Snapper Field, Tirrawarra Field, and Sacha Field.

Foster, N.H.; Beaumont, E.A.

1991-01-01T23:59:59.000Z

67

Steam Trap Application  

E-Print Network (OSTI)

characteristics. 2. Understand advantages and limitations of various checking methods. 3. Use more than one checking method. 4. Understand flash condensate. 5. Condensate makes more noise than steam. 6. Trouble shoot the system. 7. Review trap... or failed steam and condensate flow~' H closed to be undetected -Not always insensitive to back ground or ambient noise -Noise in electrical system if volume too high -Head set quality important -Location of probe on trap, contact force, pressure drop...

Murphy, J. J.

1982-01-01T23:59:59.000Z

68

Structural traps 2  

SciTech Connect

This book contains studies of fields that exist because of the presence of tectonic faulting. Tectonic faulting occurs because of the release of crustal stresses. Nontectonic faulting is due to other factors, such as salt solution and collapse or detachment from sedimentary loading and slumping. The traps responsible for the fields in this volume are related either directly or indirectly to a fault block. The traps of Amposta, Cano Limon, Ninian, Renqiu, and Sarir are directly related to a fault block. Brent and Magnus fields are the result of traps formed by an unconformity truncation and a tilted fault block. Mobeetie field is the result of a trap indirectly related to a fault block. The anticline associated with the trap formed by differential compaction over a basement fault block. Red Oak field comprises traps both in a fault block and in an overlying anticline formed by differential compaction over the same fault block. With the exception of Cano Limon, all the fault blocks associated with these fields formed mainly under tensional stresses. The fault block associated with Cano Limon field formed by shearing in a strike-slip environment. Another aspect described in each field study is the history of its exploration and development.

Beaumont, E.A.; Foster, N.H.

1990-01-01T23:59:59.000Z

69

EMSL - trace metals  

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

trace-metals en Microbial Reductive Transformation of Phyllosilicate Fe(III) and U(VI) in Fluvial Subsurface Sediments. http:www.emsl.pnl.govemslwebpublications...

70

Uncertainty Measurement for Trace Element Analysis of Uranium and Plutonium Samples by Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)  

SciTech Connect

The measurement uncertainty estimatino associated with trace element analysis of impurities in U and Pu was evaluated using the Guide to the Expression of Uncertainty Measurement (GUM). I this evalution the uncertainty sources were identified and standard uncertainties for the components were categorized as either Type A or B. The combined standard uncertainty was calculated and a coverage factor k = 2 was applied to obtain the expanded uncertainty, U. The ICP-AES and ICP-MS methods used were deveoped for the multi-element analysis of U and Pu samples. A typical analytical run consists of standards, process blanks, samples, matrix spiked samples, post digestion spiked samples and independent calibration verification standards. The uncertainty estimation was performed on U and Pu samples that have been analyzed previously as part of the U and Pu Sample Exchange Programs. Control chart results and data from the U and Pu metal exchange programs were combined with the GUM into a concentration dependent estimate of the expanded uncertainty. Comparison of trace element uncertainties obtained using this model was compared to those obtained for trace element results as part of the Exchange programs. This process was completed for all trace elements that were determined to be above the detection limit for the U and Pu samples.

Gallimore, David L. [Los Alamos National Laboratory

2012-06-13T23:59:59.000Z

71

Analysis of trap state densities at HfO{sub 2}/In{sub 0.53}Ga{sub 0.47}As interfaces  

SciTech Connect

HfO{sub 2} was deposited on n- and p-type In{sub 0.53}Ga{sub 0.47}As by chemical beam deposition. Interface trap densities (D{sub it}) and their energy level distribution were quantified using the conductance method in a wide temperature range (77 to 300 K). A trap level close to the intrinsic energy level caused the D{sub it} to rise above 10{sup 13} cm{sup -2} eV{sup -1}. The trap level at midgap gives rise to false inversion behavior in the capacitance-voltage curves for n-type channels at room temperature. The apparent decrease of the D{sub it} close to the band edges is discussed.

Hwang, Yoontae; Engel-Herbert, Roman; Rudawski, Nicholas G.; Stemmer, Susanne [Materials Department, University of California, Santa Barbara, California 93106-5050 (United States)

2010-03-08T23:59:59.000Z

72

Trace element content of magnetohydrodynamic coal combustion effluents  

Science Journals Connector (OSTI)

Trace element contents from effluents of a simulated coal-fired magnetohydrodynamic (MHD) combustion process have been determined using thermal neutron activation analysis techniques. The quality control consi...

M. S. Akanni; V. O. Ogugbuaja; W. D. James

1983-01-01T23:59:59.000Z

73

Fiscal Year 1998 Annual Report, Carbon Dioxide Information Analysis Center, World Data Center -- A for Atmospheric Trace Gases  

SciTech Connect

Once again, the most recent fiscal year was a productive one for the Carbon Dioxide Information Analysis Center (CDIAC) at Oak Ridge National Laboratory (ORNL), as well as a year for change. The FY 1998 in Review section in this report summarizes quite a few new and updated data and information products, and the ''What's Coming in FY 1999'' section describes our plans for this new fiscal year. During FY 1998, CDIAC began a data-management system for AmeriFlux, a long-term study of carbon fluxes between the terrestrial biosphere of the Western Hemisphere and the atmosphere. The specific objectives of AmeriFlux are to establish an infrastructure for guiding, collecting, synthesizing, and disseminating long-term measurements of CO{sub 2}, water, and energy exchange from a variety of ecosystems; collect critical new information to help define the current global CO{sub 2} budget; enable improved predictions of future concentrations of atmospheric CO{sub 2}; and enhance understanding of carbon fluxes. Net Ecosystem Production (NEP), and carbon sequestration in the terrestrial biosphere. The data-management system, available from CDIAC'S AmeriFlux home page (http://cdiac.esd.ornl.gov/programs/ameriflux/ ) is intended to provide consistent, quality-assured, and documented data across all AmeriFlux sites in the US, Canada, Costa Rica, and Brazil. It is being developed by Antoinette Brenkert and Tom Boden, with assistance from Susan Holladay (who joined CDIAC specifically to support the AmeriFlux data-management effort).

Cushman, R.M.; Boden, T.A.; Hook, L.A.; Jones, S.B.; Kaiser, D.P.; Nelson, T.R.

1999-03-01T23:59:59.000Z

74

Sensitive Analysis of Alkyl Alcohols as Decomposition Products of Alkyl Nitrites in Human Whole Blood and Urine by Headspace Capillary GC with Cryogenic Oven Trapping  

Science Journals Connector (OSTI)

......470-1192, Japan The abuse of alkyl nitrites is...oven trapping. | The abuse of alkyl nitrites is...Sensitivity and Specificity The abuse of alkyl nitrites is...abused by inhalation among young people for their aphrodisiac...common markets or by internet sales. The most popular......

Kanako Watanabe-Suzuki; Robert R. Lemmer; Hideki Nozawa; Osamu Suzuki; Akira Ishii

2003-02-01T23:59:59.000Z

75

Sensitive Analysis of Alkyl Alcohols as Decomposition Products of Alkyl Nitrites in Human Whole Blood and Urine by Headspace Capillary GC with Cryogenic Oven Trapping  

Science Journals Connector (OSTI)

......cryogenic oven trapping. | The abuse of alkyl nitrites is becoming...Sensitivity and Specificity The abuse of alkyl nitrites is becoming...them at common markets or by internet sales. The most popular alkyl...the detection of alkyl nitrite abuse in forensic science practice......

Kanako Watanabe-Suzuki; Robert R. Lemmer; Hideki Nozawa; Osamu Suzuki; Akira Ishii

2003-02-01T23:59:59.000Z

76

Coherence in Microchip Traps  

Science Journals Connector (OSTI)

We report the coherent manipulation of internal states of neutral atoms in a magnetic microchip trap. Coherence lifetimes exceeding 1 s are observed with atoms at distances of 5–130????m from the microchip surface. The coherence lifetime in the chip trap is independent of atom-surface distance within our measurement accuracy and agrees well with the results of similar measurements in macroscopic magnetic traps. Because of the absence of surface-induced decoherence, a miniaturized atomic clock with a relative stability in the 10-13 range can be realized. For applications in quantum information processing, we propose to use microwave near fields in the proximity of chip wires to create potentials that depend on the internal state of the atoms.

Philipp Treutlein; Peter Hommelhoff; Tilo Steinmetz; Theodor W. Hänsch; Jakob Reichel

2004-05-21T23:59:59.000Z

77

Asymmetric ion trap  

DOE Patents (OSTI)

An ion trap having two end cap electrodes disposed asymmetrically about a center of a ring electrode is disclosed. The inner surface of the end cap electrodes are conformed to an asymmetric pair of equipotential lines of the harmonic formed by the application of voltages to the electrodes. The asymmetry of the end cap electrodes allows ejection of charged species through the closer of the two electrodes which in turn allows for simultaneously detecting anions and cations expelled from the ion trap through the use of two detectors charged with opposite polarity. 4 figs.

Barlow, S.E.; Alexander, M.L.; Follansbee, J.C.

1997-12-02T23:59:59.000Z

78

Asymmetric ion trap  

DOE Patents (OSTI)

An ion trap having two end cap electrodes disposed asymmetrically about a center of a ring electrode. The inner surface of the end cap electrodes are conformed to an asymmetric pair of equipotential lines of the harmonic formed by the application of voltages to the electrodes. The asymmetry of the end cap electrodes allows ejection of charged species through the closer of the two electrodes which in turn allows for simultaneously detecting anions and cations expelled from the ion trap through the use of two detectors charged with opposite polarity.

Barlow, Stephan E. (Richland, WA); Alexander, Michael L. (Richland, WA); Follansbee, James C. (Pasco, WA)

1997-01-01T23:59:59.000Z

79

Venus Fly Trap Experiment  

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

Venus Fly Trap Experiment Venus Fly Trap Experiment Name: Jeremy Bailey Status: N/A Age: N/A Location: N/A Country: N/A Date: N/A Question: My name is Jeremy Bailey, and I am a student of Dorseyville Middle School. I have been working on a science project about Venus' Fly Traps. A recent addition to the project involved designing an experiment about something I found interesting about them. However, I don't know where to get them or how to grow them in the moderate climate of Pittsburgh. Also, I don't know how a successful experiment could be designed. Replies: Jeremy, I believe Venus Fly traps can be found 'in the wild' in the coastal floodplain of the Carolinas. As far as where to buy them, look in the phonebook yellow pages under plants or houseplants and do some calling. I live in eastern Pennsylvania, and over here they even sell them in hardware stores like Hechinger's and Home Depot (in their garden departments). I don't think you will have luck trying to grow them outside, our winters here are a bit too harsh for them. From what I recall they require substantial moisture and more moderate climes. You might try looking for houseplant books at your local library for more detailed information.

80

Nuclear Physics with trapped  

E-Print Network (OSTI)

Nuclear Physics with trapped atoms and ions #12;2/2/2013Dan Melconian #12;2/2/2013Dan Melconian Outline · Scope and applications of nuclear physics precision frontier compliments LHC properties and aquifers in the Sahara #12;2/2/2013Dan Melconian What is Nuclear Physics? · Began with the study

Boas, Harold P.

Note: This page contains sample records for the topic "trap trace analysis" 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.


81

Magnetic trap for thulium atoms  

SciTech Connect

For the first time ultra-cold thulium atoms were trapped in a magnetic quadrupole trap with a small field gradient (20 Gs cm{sup -1}). The atoms were loaded from a cloud containing 4x10{sup 5} atoms that were preliminarily cooled in a magneto-optical trap to the sub-Doppler temperature of 80 {mu}K. As many as 4x10{sup 4} atoms were trapped in the magnetic trap at the temperature of 40 {mu}K. By the character of trap population decay the lifetime of atoms was determined (0.5 s) and an upper estimate was obtained for the rate constant of inelastic binary collisions for spin-polarised thulium atoms in the ground state (g{sub in} < 10{sup -11}cm{sup 3} s{sup -1}). (magnetic traps)

Sukachev, D D; Sokolov, A V; Chebakov, K A; Akimov, A V; Kolachevskii, N N; Sorokin, Vadim N [P N Lebedev Physical Institute, Russian Academy of Sciences, Moscow (Russian Federation)

2011-08-31T23:59:59.000Z

82

The Elimination of Steam Traps  

E-Print Network (OSTI)

claims and misinformation gener ated by over thirty-six steam trap manufacturers in the United States alone. A PARTIAL LIST OF STEAM TRAP MANUFACTURERS AAF GESTRA ANDERSON HIROSS ARMSTRONG HOFFMAN BARNES &JONES HONEYWELL BRAUKMANN BESTOBELL... removal had been devised and these same methods, with minor variations, are employed today. The inverted bucket trap was in vented in 1910 by Otto Arner, a friend of Adam Armstrong. Armstrong began his business career by making bicycle spokes...

Dickman, F.

83

Inspect and Repair Steam Traps  

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

This tip sheet on inspecting and repairing steam traps provides how-to advice for improving industrial steam systems using low-cost, proven practices and technologies.

84

Trapping triply ionized thorium isotopes.  

E-Print Network (OSTI)

??Cold trapped ions have many applications in quantum information science and precision metrology. In this thesis, we present progress toward two objectives involving ions confined… (more)

Churchill, Layne Russell

2010-01-01T23:59:59.000Z

85

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Vibration Print In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally...

86

Cryogenic Ion Trapping Systems with Surface-Electrode Traps  

E-Print Network (OSTI)

We present two simple cryogenic RF ion trap systems in which cryogenic temperatures and ultra high vacuum pressures can be reached in as little as 12 hours. The ion traps are operated either in a liquid helium bath cryostat or in a low vibration closed cycle cryostat. The fast turn around time and availability of buffer gas cooling made the systems ideal for testing surface-electrode ion traps. The vibration amplitude of the closed cycled cryostat was found to be below 106 nm. We evaluated the systems by loading surface-electrode ion traps with $^{88}$Sr$^+$ ions using laser ablation, which is compatible with the cryogenic environment. Using Doppler cooling we observed small ion crystals in which optically resolved ions have a trapped lifetime over 2500 minutes.

P. B. Antohi; D. Schuster; G. M. Akselrod; J. Labaziewicz; Y. Ge; Z. Lin; W. S. Bakr; I. L. Chuang

2008-07-29T23:59:59.000Z

87

Parallel Seismic Ray Tracing  

E-Print Network (OSTI)

. . . . . . . . . . . . . . . . . . . . . 27 3.4.1 Rotated Take-Off Angle Mesh . . . . . . . . . . . . . . . . . . 28 3.4.2 Rotated Cubed Sphere Mesh . . . . . . . . . . . . . . . . . . . 29 3.4.3 Ray Tube Interpolation . . . . . . . . . . . . . . . . . . . . . . 30 3.5 Theoretical Model..., the ray parameters are defined as ?1 = ?(declination), ?2 = ?(azimuth), and ?3 = ?(travel-time). (b) Suppose we have a unit cube centered at the source point, then a ray can be traced from the source point through an evenly discretized point on the face...

Jain, Tarun K

2013-12-09T23:59:59.000Z

88

Cryogenic silicon surface ion trap  

E-Print Network (OSTI)

Trapped ions are pre-eminent candidates for building quantum information processors and quantum simulators. They have been used to demonstrate quantum gates and algorithms, quantum error correction, and basic quantum simulations. However, to realise the full potential of such systems and make scalable trapped-ion quantum computing a reality, there exist a number of practical problems which must be solved. These include tackling the observed high ion-heating rates and creating scalable trap structures which can be simply and reliably produced. Here, we report on cryogenically operated silicon ion traps which can be rapidly and easily fabricated using standard semiconductor technologies. Single $^{40}$Ca$^+$ ions have been trapped and used to characterize the trap operation. Long ion lifetimes were observed with the traps exhibiting heating rates as low as $\\dot{\\bar{n}}=$ 0.33 phonons/s at an ion-electrode distance of 230 $\\mu$m. These results open many new avenues to arrays of micro-fabricated ion traps.

Michael Niedermayr; Kirill Lakhmanskiy; Muir Kumph; Stefan Partel; Johannes Edlinger; Michael Brownnutt; Rainer Blatt

2014-03-20T23:59:59.000Z

89

Coherent control of a qubit is trap-free  

E-Print Network (OSTI)

There is a strong interest in optimal manipulating of quantum systems by external controls. Traps are controls which are optimal only locally but not globally. If they exist, they can be serious obstacles to the search of globally optimal controls in numerical and laboratory experiments, and for this reason the analysis of traps attracts considerable attention. In this paper we prove that for a wide range of control problems for two-level quantum systems all locally optimal controls are also globally optimal. Hence we conclude that two-level systems in general are trap-free. In particular, manipulating qubits---two-level quantum systems forming a basic building block for quantum computation---is free of traps for fundamental problems such as the state preparation and gate generation.

Alexander Pechen; Nikolay Il'in

2014-07-19T23:59:59.000Z

90

Vibrational relaxation of trapped molecules  

Science Journals Connector (OSTI)

Vibrational relaxation of trapped molecules due to collisions with cold atoms is investigated using the results of quantum-mechanical scattering calculations. Trap loss is analyzed using an exactly solvable kinetic model that includes direct collisional quenching and an indirect process of vibrational predissociation. At low atom density, the relaxation is due primarily to collisional quenching. At high atom density, the relaxation involves additional time scales due to the formation and decay of van der Waals complexes. It is shown that the most weakly bound state of the van der Waals complex for a given diatomic vibrational level controls the relaxation at all atom densities. Possible experiments using trapped molecules are discussed.

R. C. Forrey; V. Kharchenko; N. Balakrishnan; A. Dalgarno

1999-03-01T23:59:59.000Z

91

Mini ion trap mass spectrometer  

DOE Patents (OSTI)

An ion trap is described which operates in the regime between research ion traps which can detect ions with a mass resolution of better than 1:10{sup 9} and commercial mass spectrometers requiring 10{sup 4} ions with resolutions of a few hundred. The power consumption is kept to a minimum by the use of permanent magnets and a novel electron gun design. By Fourier analyzing the ion cyclotron resonance signals induced in the trap electrodes, a complete mass spectra in a single combined structure can be detected. An attribute of the ion trap mass spectrometer is that overall system size is drastically reduced due to combining a unique electron source and mass analyzer/detector in a single device. This enables portable low power mass spectrometers for the detection of environmental pollutants or illicit substances, as well as sensors for on board diagnostics to monitor engine performance or for active feedback in any process involving exhausting waste products. 10 figs.

Dietrich, D.D.; Keville, R.F.

1995-09-19T23:59:59.000Z

92

Mini ion trap mass spectrometer  

DOE Patents (OSTI)

An ion trap which operates in the regime between research ion traps which can detect ions with a mass resolution of better than 1:10.sup.9 and commercial mass spectrometers requiring 10.sup.4 ions with resolutions of a few hundred. The power consumption is kept to a minimum by the use of permanent magnets and a novel electron gun design. By Fourier analyzing the ion cyclotron resonance signals induced in the trap electrodes, a complete mass spectra in a single combined structure can be detected. An attribute of the ion trap mass spectrometer is that overall system size is drastically reduced due to combining a unique electron source and mass analyzer/detector in a single device. This enables portable low power mass spectrometers for the detection of environmental pollutants or illicit substances, as well as sensors for on board diagnostics to monitor engine performance or for active feedback in any process involving exhausting waste products.

Dietrich, Daniel D. (Livermore, CA); Keville, Robert F. (Valley Springs, CA)

1995-01-01T23:59:59.000Z

93

Managing the Steam Trap Population  

E-Print Network (OSTI)

hundred steam traps installed only 58 were working effectively -- 42% needed attention! These programs had associated cost benefits of at least 100% return on investment, a maximum six month breakeven on cash flow, and an energy cost reduction amounting...

Atlas, R. D.

1983-01-01T23:59:59.000Z

94

Novel Dipole Trapped Spheromak Configuration  

Science Journals Connector (OSTI)

We report the observation and characterization of a spheromak formed in the Swarthmore Spheromak Experiment (SSX) and trapped in a simple dipole magnetic field. The spheromak is studied in the prolate (tilt unsta...

M. R. Brown; C. D. Cothran; J. Fung; M. J. Schaffer; E. Belova

2007-06-01T23:59:59.000Z

95

Rainbow trapping of guided waves  

E-Print Network (OSTI)

Rainbow trapping of guided waves Javier Polanco and Rosa M.the propagation of a wave packet that is a superpositionof three s-polarized guided waves with different frequencies

Polanco, Javier; Fitzgerald, Rosa M; Leskova, Tamara A; Maradudin, Alexei A

2011-01-01T23:59:59.000Z

96

Quantum Engineering with Trapped Ions  

Science Journals Connector (OSTI)

We describe how to manipulate, and characterize the motional state of a trapped ion. We also give a method to measure an arbitrary motional observable in a single shot.

J. F. Poyatos; S. A. Gardiner; R. Walser…

1997-01-01T23:59:59.000Z

97

HP Steam Trap Monitoring  

E-Print Network (OSTI)

Consumption Peak Demand Mgt Peak Demand Mgt Similar Weather Day Analysis Metering and Verafication Steam Meter Monitoring ? Peak Demand Management ? Steam Consumption Management ? Steam Bill Verification ? Measurement and Verification ... Consumption Peak Demand Mgt Peak Demand Mgt Similar Weather Day Analysis Metering and Verafication Steam Meter Monitoring ? Peak Demand Management ? Steam Consumption Management ? Steam Bill Verification ? Measurement and Verification ...

Pascone, S.

2011-01-01T23:59:59.000Z

98

Application of neutron activation analysis and high resolution x-ray spectrometry for the determination of trace quantities of elements with short-lived activation products  

E-Print Network (OSTI)

Conversion Interferences and Errors 3, PROCEDURES AND EXPERIMENTAL SETUP Sample Preparation Pneumatic Sample Transfer System Sample Irradiation X-ray Spectrometry Data Reduction 4. DISCUSSION AND RESULTS System Analysis Analysis Problems.... C. Roentgen made the classic observation that a highly penatrative radiation, unknown at that time, was produced when fast electrons impinged on matter. This radiation, which h called x-rays, was being studied in all parts of the world less than...

Marshall, John Richard

1974-01-01T23:59:59.000Z

99

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Vibration Print Electron Trapping by Molecular Vibration Print In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally thought to be forbidden can in fact be excited in conjunction with certain types of molecular vibrations. Specifically, they found that when the symmetry of a linear triatomic molecule is broken by asymmetric vibrational modes, photoelectrons can become temporarily trapped by the molecule before ultimately escaping, giving rise to a broad feature in the photoelectron spectrum known as a shape resonance. This process represents a novel type of symmetry-breaking phenomenon that has not been observed previously but appears to be widespread. Such coupling between electronic motion and nuclear motion becomes increasingly important as scientists learn more about the geometry and dynamics of novel chemical structures such as those found in nanodevices and transient chemical species, and the results have implications for studies that use photoelectron spectroscopy as a diagnostic tool.

100

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Vibration Print Electron Trapping by Molecular Vibration Print In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally thought to be forbidden can in fact be excited in conjunction with certain types of molecular vibrations. Specifically, they found that when the symmetry of a linear triatomic molecule is broken by asymmetric vibrational modes, photoelectrons can become temporarily trapped by the molecule before ultimately escaping, giving rise to a broad feature in the photoelectron spectrum known as a shape resonance. This process represents a novel type of symmetry-breaking phenomenon that has not been observed previously but appears to be widespread. Such coupling between electronic motion and nuclear motion becomes increasingly important as scientists learn more about the geometry and dynamics of novel chemical structures such as those found in nanodevices and transient chemical species, and the results have implications for studies that use photoelectron spectroscopy as a diagnostic tool.

Note: This page contains sample records for the topic "trap trace analysis" 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

Heat-Traced Fluid Transfer Lines  

E-Print Network (OSTI)

This paper discusses basic considerations in designing a heat tracing system using either team or electrical tracing. Four basic reasons to heat trace are dealt with: water freeze protection, chemical freeze protection, viscosity maintenance...

Schilling, R. E.

1984-01-01T23:59:59.000Z

102

Tracing Geothermal Fluids  

SciTech Connect

Geothermal water must be injected back into the reservoir after it has been used for power production. Injection is critical in maximizing the power production and lifetime of the reservoir. To use injectate effectively the direction and velocity of the injected water must be known or inferred. This information can be obtained by using chemical tracers to track the subsurface flow paths of the injected fluid. Tracers are chemical compounds that are added to the water as it is injected back into the reservoir. The hot production water is monitored for the presence of this tracer using the most sensitive analytic methods that are economically feasible. The amount and concentration pattern of the tracer revealed by this monitoring can be used to evaluate how effective the injection strategy is. However, the tracers must have properties that suite the environment that they will be used in. This requires careful consideration and testing of the tracer properties. In previous and parallel investigations we have developed tracers that are suitable from tracing liquid water. In this investigation, we developed tracers that can be used for steam and mixed water/steam environments. This work will improve the efficiency of injection management in geothermal fields, lowering the cost of energy production and increasing the power output of these systems.

Michael C. Adams; Greg Nash

2004-03-01T23:59:59.000Z

103

Benchmark Reaction Mechanisms and Kinetics for Lean NOx Traps...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Benchmark Reaction Mechanisms and Kinetics for Lean NOx Traps Development of Chemical Kinetic Models for Lean NOx Traps Modeling the Regeneration Chemistry of Lean NOx Traps...

104

Selective ECR heating of trapped/passing electrons in the W7-X stellarator  

SciTech Connect

Using specific features of the magnetic equilibrium in the W7-X stellarator, ECRH scenarios with X2 and X3 modes are discussed. The aim is to explore the possibility of selective heating of the different classes of electrons, passing and trapped, by different RF beams with different frequencies, which can be launched from ports located in different crosssections of the device. Perspectives for this kind of experiments in W7-X are estimated numerically by coupling transport and ray tracing codes.

Marushchenko, N. B.; Erckmann, V.; Beidler, C. D.; Geiger, J.; Laqua, H. P.; Helander, P.; Maassberg, H.; Turkin, Y. [Max Planck Institute for Plasma Physics, EURATOM Association, Wendelsteinstr. 1, D-17491 Greifswald (Germany)

2014-02-12T23:59:59.000Z

105

ARM - Measurement - Trace gas concentration  

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

govMeasurementsTrace gas concentration govMeasurementsTrace gas concentration 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 Measurement : Trace gas concentration The amount per unit volume of trace gases other than carbon dioxide, ozone and water vapor, typically measured in conjunction with in situ aerosol measurements, e.g. carbon monoxide, nitrogen oxides, sulfur dioxide. Categories Atmospheric Carbon, Atmospheric State Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments CO : Carbon Monoxide Mixing Ratio System

106

Trace 700 | Open Energy Information  

Open Energy Info (EERE)

Trace 700 Trace 700 Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Trace 700 Agency/Company /Organization: Trane Sector: Energy Focus Area: Buildings, Energy Efficiency Topics: Technology characterizations Resource Type: Software/modeling tools Website: www.trane.com/Commercial/Dna/View.aspx?i=1136 References: http://www.trane.com/Commercial/Dna/View.aspx?i=1136 Detailed HVAC design tool. Can provide heating and cooling load calculation, system sizing, and energy use. A fairly thorough understanding of HVAC is necessary to use this tool. Tool Summary LAUNCH TOOL Name: Trace 700 Agency/Company /Organization: Trane Phase: Create a Vision, Determine Baseline, "Evaluate Options and Determine Feasibility" is not in the list of possible values (Bring the Right People Together, Create a Vision, Determine Baseline, Evaluate Options, Develop Goals, Prepare a Plan, Get Feedback, Develop Finance and Implement Projects, Create Early Successes, Evaluate Effectiveness and Revise as Needed) for this property.

107

Electron Trapping by Molecular Vibration  

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

Electron Trapping by Molecular Electron Trapping by Molecular Vibration Electron Trapping by Molecular Vibration Print Wednesday, 27 April 2005 00:00 In photoelectron spectroscopy experiments performed at the ALS, a group of researchers has found that electronic transitions normally thought to be forbidden can in fact be excited in conjunction with certain types of molecular vibrations. Specifically, they found that when the symmetry of a linear triatomic molecule is broken by asymmetric vibrational modes, photoelectrons can become temporarily trapped by the molecule before ultimately escaping, giving rise to a broad feature in the photoelectron spectrum known as a shape resonance. This process represents a novel type of symmetry-breaking phenomenon that has not been observed previously but appears to be widespread. Such coupling between electronic motion and nuclear motion becomes increasingly important as scientists learn more about the geometry and dynamics of novel chemical structures such as those found in nanodevices and transient chemical species, and the results have implications for studies that use photoelectron spectroscopy as a diagnostic tool.

108

Solar Coronal Structures and Stray Light in TRACE  

E-Print Network (OSTI)

Using the 2004 Venus transit of the Sun to constrain a semi-empirical point-spread function for the TRACE EUV solar telescope, we have measured the effect of stray light in that telescope. We find that 43% of 171A EUV light that enters TRACE is scattered, either through diffraction off the entrance filter grid or through other nonspecular effects. We carry this result forward, via known-PSF deconvolution of TRACE images, to identify its effect on analysis of TRACE data. Known-PSF deconvolution by this derived PSF greatly reduces the effect of visible haze in the TRACE 171A images, enhances bright features, and reveals that the smooth background component of the corona is considerably less bright (and hence much more rarefied) than commonly supposed. Deconvolution reveals that some prior conlclusions about the Sun appear to have been based on stray light in the images. In particular, the diffuse background "quiet corona" becomes consistent with hydrostatic support of the coronal plasma; feature contrast is greatly increased, possibly affecting derived parameters such as the form of the coronal heating function; and essentially all existing differential emission measure studies of small features appear to be affected by contamination from nearby features. We speculate on further implications of stray light for interpretation of EUV images from TRACE and similar instruments, and advocate deconvolution as a standard tool for image analysis with future instruments such as SDO/AIA.

C. E. DeForest; P. C. H. Martens; M. J. Wills-Davey

2008-08-29T23:59:59.000Z

109

Inertial measurement via dynamics of trapped particles  

E-Print Network (OSTI)

We describe theoretical and practical aspects of the particle trap as an inertial sensor. The insight motivating this approach is that a trapped particle acts like a mass on a spring, but the restoring forces are provided ...

Post, E. Rehmi, 1966-

2003-01-01T23:59:59.000Z

110

Carbon Nanotubes in an Optical Trap  

Science Journals Connector (OSTI)

Study of carbon nanotubes (CNTs) in a single beam optical trap (1064 nm) was done. In the optical trap, repulsion of the CNTS from the laser radiation, bubble formation, broad band...

Ramanandan, Gopika; Dharmadhikari, Aditya K; Ramachandran, Hema; Dharmadhikari, Jayasree A; Mathur, Deepak

111

Condensation of Excitons in a Trap  

Science Journals Connector (OSTI)

Condensation is observed in a gas of indirect excitons confined in an electrostatic trap. Imaging and interferometric measurements detect that excitons condense at the trap bottom and exciton spontaneous coherence emerges with lowering temperature. Below ...

A. A. High; J. R. Leonard; M. Remeika; L. V. Butov; M. Hanson; A. C. Gossard

2012-04-17T23:59:59.000Z

112

Review of Orifice Plate Steam Traps  

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

This guide was prepared to serve as a foundation for making informed decisions about when orifice plate steam traps should be considered for use in new or existing steam systems. It presents background information about different types of steam traps and defines their unique functional and operational characteristics. The advantages and disadvantages associated with using orifice plate steam traps are provided to highlight their capabilities and limitations. Finally, recommendations for using orifice plate steam traps are presented, and possible applications are identified.

113

Optical trapping for undergraduates D. C. Appleyard  

E-Print Network (OSTI)

Optical trapping for undergraduates D. C. Appleyard Department of Biological Engineering September 2006 The detailed design of a robust and inexpensive optical trap system is presented. The system experimental modules are described to cover basic concepts in optical trapping and biophysics at a level

Lang, Matthew

114

Finite element simulations of hydrodynamic trapping in microfluidic particle-trap array systems  

E-Print Network (OSTI)

Finite element simulations of hydrodynamic trapping in microfluidic particle- trap array systems;Finite element simulations of hydrodynamic trapping in microfluidic particle-trap array systems Xiaoxiao) simulation is a powerful tool in the design and implementation of microfluidic systems, especially

Nehorai, Arye

115

Trace element analysis of Texas lignite  

E-Print Network (OSTI)

or in the planning stages, Near surface lignite re- sources are estimated to be 21 billion metric tons in Texas, while deep basin reserves are estimated at 31 billion metric tons. Near (3] surface reserves alone could fulfill Texas' electrical needs for 100 years... or in the planning stages, Near surface lignite re- sources are estimated to be 21 billion metric tons in Texas, while deep basin reserves are estimated at 31 billion metric tons. Near (3] surface reserves alone could fulfill Texas' electrical needs for 100 years...

Mahar, Sean

2012-06-07T23:59:59.000Z

116

Inferring human mobility patterns from taxicab location traces  

Science Journals Connector (OSTI)

Taxicabs equipped with real-time location sensing devices are increasingly becoming popular. Such location traces are a rich source of information and can be used for congestion pricing, taxicab placement, and improved city planning. An important problem ... Keywords: hidden markov models, human mobility patterns, taxi cab occupancy, trajectory analysis

Raghu Ganti; Mudhakar Srivatsa; Anand Ranganathan; Jiawei Han

2013-09-01T23:59:59.000Z

117

Tracing the behavior of parallel applications on extreme-scale systems |  

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

Tracing the behavior of parallel applications on extreme-scale systems Tracing the behavior of parallel applications on extreme-scale systems January 3, 2014 Tweet EmailPrint Event-tracing tools have proved vital for understanding how parallel applications behave. But new challenges make the use of event tracing on extreme-scale machines problematic. Tracing tools generate large amounts of data, which can overload the parallel file system and skew the application being studied. To remedy this problem, researchers from Argonne National Laboratory, the Technische Universität Dresden in Germany, and Oak Ridge National Laboratory have devised a new technique that enables event tracing on exascale systems. Scientists who have been using existing performance analysis tools find that these frequently do not scale to large systems. And even if they do

118

Capturing Energy Savings with Steam Traps  

E-Print Network (OSTI)

Capturing Energy Savings with Steam Traps Richard C; Bockwinkel General Manager Armstrong Service? A Division of Armstrong International, Inc. Orlando, Florida ABSTRACT This paper will discuss the energy savings potential of steam... Engineer Steam Traps Armstrong International, Inc. Three Rivers, Michigan basis. Finally, it's important to recognize that a steam trap program will reduce steam waste> which will reduce the amount of fuel burned> which will reduce pollutants...

Bockwinkel, R. G.; French, S. A.

119

Reduce Steam Trap Failures at Chambers Works  

E-Print Network (OSTI)

Ultrasonic Inspection At least 2 times per year Steam Trap Surveyor Submit reports to area management, energy team, and reliability engineers for each area every month Steam Trap Team Leader Control Plan ? Process Owner agrees...Reduce Steam Trap Failures at Chambers Works GB/BB Name: Cyndi Kouba Mentor/MBB: Andrew Degraff Team Members Michael Crowley(Site Energy Lead), (Charlie) Flanigan (Aramids-maintenance), Ben Snyder (Aramids-ATO), Michael Scruggs (Central...

Kouba, C.

120

Trace element partitioning between type B CAI melts and melilite and spinel: Implications for trace element distribution  

E-Print Network (OSTI)

. Partition coefficients between intermediate composition melilites and CAI melt are the following: Li, 0.5 size energetics analysis is used to assess isovalent partitioning into the different cation sites, interpreta- tion of the trace element and isotope compositions of CAIs, particularly the light elements Li

Mcdonough, William F.

Note: This page contains sample records for the topic "trap trace analysis" 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

Specifying API Trace Birthmark by Abstract Interpretation  

Science Journals Connector (OSTI)

API trace birthmark is a major class of software birthmarks, where API sequences are defined as software birthmarks to ... , an abstract interpretation-based method for specifying API trace birthmark is proposed ...

Ying Zeng; Fenlin Liu; Jian Chen; Bin Yan

2013-01-01T23:59:59.000Z

122

Distributed trace using central performance counter memory  

DOE Patents (OSTI)

A plurality of processing cores, are central storage unit having at least memory connected in a daisy chain manner, forming a daisy chain ring layout on an integrated chip. At least one of the plurality of processing cores places trace data on the daisy chain connection for transmitting the trace data to the central storage unit, and the central storage unit detects the trace data and stores the trace data in the memory co-located in with the central storage unit.

Satterfield, David L; Sexton, James C

2013-10-22T23:59:59.000Z

123

Privacy vulnerability of published anonymous mobility traces  

Science Journals Connector (OSTI)

Mobility traces of people and vehicles have been collected and published to assist the design and evaluation of mobile networks, such as large-scale urban sensing networks. Although the published traces are often made anonymous in that the true identities ... Keywords: mobility traces, privacy, security and protection

Chris Y. T. Ma; David K. Y. Yau; Nung Kwan Yip; Nageswara S. V. Rao

2013-06-01T23:59:59.000Z

124

Ray Tracing JELLO Brand Paul S. Heckbert  

E-Print Network (OSTI)

Ray Tracing JELL­O ® Brand Gelatin Paul S. Heckbert Dessert Foods Division Pixar San Rafael, CA ABSTRACT Ray tracing has established itself in recent years as the most general image synthesis algorithm for ray tracing Jell­O ® brand gelatin. We believe the method may have application to other brands

Treuille, Adrien

125

Point-to-curve ray tracing  

Science Journals Connector (OSTI)

Point-to-curve ray tracing is an attempt at dealing with multiplicity of solutions to a generic boundary-value problem of ray tracing. In a point-to-curve tracing (P2C) the input parameters of the boundary-value....

Andrzej Hanyga

1996-01-01T23:59:59.000Z

126

Point-to-curve Ray Tracing  

Science Journals Connector (OSTI)

Point-to-curve ray tracing is an attempt at dealing with multiplicity of solutions to a generic boundary-value problem of ray tracing. In a point-to-curve tracing (P2C) the input parameters of the boundary-value....

Andrzej Hanyga

1996-01-01T23:59:59.000Z

127

Plant View On Reducing Steam Trap Energy Loss  

E-Print Network (OSTI)

of the steam traps are passing excess steam. This is caused by neglect of aged steam traps which have worn out and misapplication of steam traps by oversizing or using the 'wrong' type trap. Elimination of steam wastes by an effective well engineered steam trap...

Vallery, S. J.

1982-01-01T23:59:59.000Z

128

Effect of trapping on transport coherence  

Science Journals Connector (OSTI)

Influence of a trap (sink) on exciton transfer in molecular aggregates is investigated. Memory functions entering the generalized master equations are calculated. The presence of the sink changes their analytical form. We used the sink in trimers as an example to show that for large trapping-rate parameters the rest of the system is decoupled from the sink.

Ivan Barvk and Pavel Heman

1992-02-01T23:59:59.000Z

129

Entangled states of trapped atomic ions  

Science Journals Connector (OSTI)

... typical experiment involves trapping a few ions by using a combination of static and sinusoidally oscillating electric potentials that are applied between the electrodes of a linear quadrupole, an arrangement ... Fig. 1). When the trapped ions are laser cooled, they form a linear 'string', in which the spacings are determined by a balance between the horizontal (axial) ...

Rainer Blatt; David Wineland

2008-06-18T23:59:59.000Z

130

Standard Model tests with trapped radioactive atoms  

E-Print Network (OSTI)

We review the use of laser cooling and trapping for Standard Model tests, focusing on trapping of radioactive isotopes. Experiments with neutral atoms trapped with modern laser cooling techniques are testing several basic predictions of electroweak unification. For nuclear $\\beta$ decay, demonstrated trap techniques include neutrino momentum measurements from beta-recoil coincidences, along with methods to produce highly polarized samples. These techniques have set the best general constraints on non-Standard Model scalar interactions in the first generation of particles. They also have the promise to test whether parity symmetry is maximally violated, to search for tensor interactions, and to search for new sources of time reversal violation. There are also possibilites for exotic particle searches. Measurements of the strength of the weak neutral current can be assisted by precision atomic experiments using traps of small numbers of radioactive atoms, and sensitivity to possible time-reversal violating electric dipole moments can be improved.

J. A. Behr; G. Gwinner

2009-03-04T23:59:59.000Z

131

Autonomous microexplosives subsurface tracing system final report.  

SciTech Connect

The objective of the autonomous micro-explosive subsurface tracing system is to image the location and geometry of hydraulically induced fractures in subsurface petroleum reservoirs. This system is based on the insertion of a swarm of autonomous micro-explosive packages during the fracturing process, with subsequent triggering of the energetic material to create an array of micro-seismic sources that can be detected and analyzed using existing seismic receiver arrays and analysis software. The project included investigations of energetic mixtures, triggering systems, package size and shape, and seismic output. Given the current absence of any technology capable of such high resolution mapping of subsurface structures, this technology has the potential for major impact on petroleum industry, which spends approximately $1 billion dollar per year on hydraulic fracturing operations in the United States alone.

Engler, Bruce Phillip; Nogan, John; Melof, Brian Matthew; Uhl, James Eugene; Dulleck, George R., Jr.; Ingram, Brian V.; Grubelich, Mark Charles; Rivas, Raul R.; Cooper, Paul W.; Warpinski, Norman Raymond; Kravitz, Stanley H.

2004-04-01T23:59:59.000Z

132

A bosonic Josephson junction controlled by a single trapped ion  

E-Print Network (OSTI)

We theoretically investigate the properties of a double-well bosonic Josephson junction coupled to a single trapped ion. We find that the coupling between the wells can be controlled by the internal state of the ion, which can be used for studying mesoscopic entanglement between the two systems and to measure their interaction with high precision. As a particular example we consider a single $^{87}$Rb atom and a small Bose-Einstein condensate controlled by a single $^{171}$Yb$^+$ ion. We calculate inter-well coupling rates reaching hundreds of Hz, while the state dependence amounts to tens of Hz for plausible values of the currently unknown s-wave scattering length between the atom and the ion. The analysis shows that it is possible to induce either the self-trapping or the tunneling regime, depending on the internal state of the ion. This enables the generation of large scale ion-atomic wavepacket entanglement within current technology.

R. Gerritsma; A. Negretti; H. Doerk; Z. Idziaszek; T. Calarco; F. Schmidt-Kaler

2012-07-25T23:59:59.000Z

133

Microfabricated Renewable Beads-Trapping/Releasing Flow Cell...  

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

Microfabricated Renewable Beads-TrappingReleasing Flow Cell for Rapid Antigen-Antibody Reaction in Chemiluminescent Immunoassay Microfabricated Renewable Beads-TrappingReleasing...

134

Characterization of Trapped Lignin-Degrading Microbes in Tropical...  

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

Trapped Lignin-Degrading Microbes in Tropical Forest Soil. Characterization of Trapped Lignin-Degrading Microbes in Tropical Forest Soil. Abstract: Lignin is often the most...

135

H2-Assisted NOx Traps: Test Cell Results Vehicle Installations...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

H2-Assisted NOx Traps: Test Cell Results Vehicle Installations H2-Assisted NOx Traps: Test Cell Results Vehicle Installations 2003 DEER Conference Presentation: ArvinMeritor...

136

H2-Assisted NOx Traps: Test Cell Results Vehicle Installations  

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

Sam Crane August 28, 2003 H 2 -Assisted NOx Traps: Test Cell Results Vehicle Installations 2 Project Objectives * Determine Advantages of H 2 Assisted NO x Trap Regeneration *...

137

NOx Adsorber (Lean NOx Trap) Fundamentals (Agreement #10049 ...  

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

NOx Adsorber (Lean NOx Trap) Fundamentals (Agreement 10049 - PNNL Project 47120) NOx Adsorber (Lean NOx Trap) Fundamentals (Agreement 10049 - PNNL Project 47120) Presentation...

138

Modeling the Regeneration Chemistry of Lean NOx Traps | Department...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

the Regeneration Chemistry of Lean NOx Traps Modeling the Regeneration Chemistry of Lean NOx Traps Presentation given at DEER 2006, August 20-24, 2006, Detroit, Michigan. Sponsored...

139

Steam Trap Maintenance as a Profit Center  

E-Print Network (OSTI)

the Eighteenth Industrial Energy Technology Conference, Houston, TX, April 17-18, 1996 EXCUSES Everybody thinks his or her steam trap maintenance is good. Surveysl have shown the following are the most popular excuses encountered when managers are confronted... for steam traps. 192 ESL-IE-96-04-28 Proceedings from the Eighteenth Industrial Energy Technology Conference, Houston, TX, April 17-18, 1996 5. Set up a trap maintenance program C. Prepare and present a report to that will: management on the results...

Bouchillon, J. L.

140

Compact RF resonator for cryogenic ion traps  

E-Print Network (OSTI)

We report on the investigation and implementation of a lumped-component, radio-frequency resonator used in a cryogenic vacuum environment to drive an ion trap. The resonator was required to achieve the voltages necessary to trap (about 100 V), while dissipating as little power as possible (< 250 mW). Ultimately a voltage gain of 100 was measured at 5.7 K. Single calcium ions were confined in a trap driven by this device, providing proof of successful resonator operation at low temperature.

D. Gandolfi; M. Niedermayr; M. Kumph; M. Brownnutt; R. Blatt

2012-04-23T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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

Tool for Rapid Assessment of City Energy (TRACE) | Open Energy Information  

Open Energy Info (EERE)

Tool for Rapid Assessment of City Energy (TRACE) Tool for Rapid Assessment of City Energy (TRACE) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Tool for Rapid Assessment of City Energy (TRACE) Agency/Company /Organization: Energy Sector Management Assistance Program of the World Bank Sector: Climate Focus Area: Renewable Energy, Buildings, Energy Efficiency Topics: Low emission development planning, Pathways analysis Resource Type: Training materials, Software/modeling tools User Interface: Website Website: esmap.org/esmap/TRACE Cost: Free Equivalent URI: cleanenergysolutions.org/content/tool-rapid-assessment-city-energy-tra Language: English Policies: Deployment Programs DeploymentPrograms: Technical Assistance References: TRACE[1] This tool offers cities a quick and easy way to assess their energy

142

Nonlinear Spectroscopy of Trapped Ions  

E-Print Network (OSTI)

Nonlinear spectroscopy employs a series of laser pulses to interrogate dynamics in large interacting many-body systems, and has become a highly successful method for experiments in chemical physics. Current quantum optical experiments approach system sizes and levels of complexity which require the development of efficient techniques to assess spectral and dynamical features with scalable experimental overhead. However, established methods from optical spectroscopy of macroscopic ensembles cannot be applied straightforwardly to few-atom systems. Based on the ideas proposed in [M. Gessner et al. New J. Phys. 16 092001 (2014)], we develop a diagrammatic approach to construct nonlinear measurement protocols for controlled quantum systems and discuss experimental implementations with trapped ion technology in detail. These methods in combination with distinct features of ultra-cold matter systems allow us to monitor and analyze excitation dynamics in both the electronic and vibrational degrees of freedom. They are independent of system size, and can therefore reliably probe systems where, e.g., quantum state tomography becomes prohibitively expensive. We propose signals that can probe steady state currents, detect the influence of anharmonicities on phonon transport, and identify signatures of chaotic dynamics near a quantum phase transition in an Ising-type spin chain.

Frank Schlawin; Manuel Gessner; Shaul Mukamel; Andreas Buchleitner

2014-10-07T23:59:59.000Z

143

Adsorptive Stripping Voltammetric Measurements of Trace Uranium...  

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

Measurements of Trace Uranium at the Bismuth Film Electrode. Abstract: Bismuth-coated carbon-fiber electrodes have been successfully applied for adsorptive-stripping...

144

Accelerated Ray Traced Animations Exploiting Temporal Coherence.  

E-Print Network (OSTI)

??Ray tracing is a well-know technique for producing realistic graphics. However, the time necessary to generate images is unacceptably long. When producing the many frames… (more)

Baines, Darwin Tarry

2005-01-01T23:59:59.000Z

145

The Canadian Penning Trap Spectrometer at Argonne  

Science Journals Connector (OSTI)

The Canadian Penning Trap (CPT) mass spectrometer is a device used for high-precision mass measurements on short-lived isotopes. It is located at the ATLAS superconducting heavy-ion linac facility where a nove...

G. Savard; R. C. Barber; C. Boudreau…

2001-01-01T23:59:59.000Z

146

The Canadian Penning Trap Spectrometer at Argonne  

Science Journals Connector (OSTI)

The Canadian Penning Trap (CPT) mass spectrometer is a device used for high-precision mass measurements on short-lived isotopes. It is located at the ATLAS superconducting heavy-ion linac facility where a nove...

G. Savard; R. C. Barber; C. Boudreau; F. Buchinger; J. Caggiano…

147

pH-biased isoelectric trapping separations  

E-Print Network (OSTI)

The classical isoelectric trapping (IET) technique, using the multicompartment electrolyzer (MCE), has been one of the most successful electrophoretic techniques in preparative-scale protein separations. IET is capable of achieving high resolution...

Shave, Evan Eric

2006-10-30T23:59:59.000Z

148

Shale gas is natural gas trapped inside  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Shale gas is natural gas trapped inside formations of shale - fine grained sedimentary rocks that can be rich sources of petroleum and natural gas. Just a few years ago, much of...

149

Scaling the Ion Trap Quantum Processor  

Science Journals Connector (OSTI)

...atomic ion species to act as "refrigerator" ions to quench the...scale beyond the QCCD in a modular architecture, one can link separate...trapped ion technology. (A) Modular distributed...A major challenge in both modular quantum computer...

C. Monroe; J. Kim

2013-03-08T23:59:59.000Z

150

FEMP-FTA--Steam Trap Performance Assessment  

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

Steam Trap Function Steam Trap Function Steam traps are automatic valves used in every steam system to remove conden- sate, air, and other non-condensable gases while preventing or minimizing the passing of steam. If condensate is allowed to collect, it reduces the flow capacity of steam lines and the thermal capacity of heat transfer equipment. In addition, excess condensate can lead to "water hammer," with potentially destructive and dangerous results. Air that remains after system startup reduces steam pressure and temperature and may also reduce the thermal capacity of heat transfer equipment. Non-condensable gases, such as oxygen and carbon dioxide, cause corrosion. Steam that passes through the trap provides no heating ser- vice. This effectively reduces the heating capacity

151

Muon trapping at monovacancies in iron  

Science Journals Connector (OSTI)

Positive-muon—spin-rotation experiments were performed on electron irradiated iron. A new defect-associated frequency is observed which is assigned to muons trapped at monovacancies. The hyperfine field at the vacancy site is -0.956 T at 140 K. The diffusion constant for ?+ in iron deduced from the trapping rate follows an Arrhenius law with an activation energy of 38±3 meV between 90 and 190 K.

A. Möslang; H. Graf; G. Balzer; E. Recknagel; A. Weidinger; Th. Wichert; R. I. Grynszpan

1983-03-01T23:59:59.000Z

152

A Static Dilution System to Produce Trace Level Gas Standards for Chromatography  

Science Journals Connector (OSTI)

......trace chromatographic analysis of extraneous gases...standards for quantitative analysis of O2, N 2 , and other...its versatility and reliability. Introduction High-purity...atmosphere), and in analysis (as a carrier gas for...dried in a silica gel reactor before being admitted......

N.P. Neves; Jr.; C.A. Gasparoto; C.H. Collins

1995-10-01T23:59:59.000Z

153

Layered Video Coding Offset Distortion Traces for Trace-Based Evaluation of Video Quality after  

E-Print Network (OSTI)

Layered Video Coding Offset Distortion Traces for Trace-Based Evaluation of Video Quality after@kom.aau.dk Abstract-- Currently available video traces for scalable en- coded video with more than one layer are a convenient repre- sentation of the encoded video for the evaluation of networking mechanisms. The video

Reisslein, Martin

154

Layered Video Coding Offset Distortion Traces for Trace-Based Evaluation of Video Quality after  

E-Print Network (OSTI)

1 Layered Video Coding Offset Distortion Traces for Trace-Based Evaluation of Video Quality after video traces for scalable encoded video with more than one layer are a convenient representation of the encoded video for the evaluation of networking mechanisms. The video distortion (RMSE) or quality (PSNR

Reisslein, Martin

155

Antihydrogen Trapped in the ALPHA Experiment  

ScienceCinema (OSTI)

In 2010 the ALPHA collaboration succeeded in trapping antihydrogen atoms for the first time.[i]  Stored antihydrogen promises to be a unique tool for making high precision measurements of the structure of this first anti-atom. Achieving this milestone presented several substantial experimental challenges and this talk will describe how they were overcome.   The unique design features of the ALPHA apparatus will be explained.[ii]  These allow a high intensity positron source and an antiproton imaging detector similar to the one used in the ATHENA[iii] experiment to be combined with an innovative magnet design of the anti-atom trap. This seeks to minimise the perturbations to trapped charged particles which may cause particle loss and heating[iv].   The diagnostic techniques used to measure the diameter, number, density, and temperatures of both plasmas will be presented as will the methods developed to actively compress and cool of both plasma species to sizes and temperatures [v],[vi], [vii] where trapping attempts with a reasonable chance of success can be tried.   The results of the successful trapping experiments will be outlined as well as some subsequent experiments to improve the trapping rate and storage time. [i] 'Trapped antihydrogen' G.B. Andresen et al., Nature 468, 673 (2010) [ii]'A Magnetic Trap for Antihydrogen Confinement' W. Bertsche et al., Nucl. Instr. Meth. Phys. Res. A566, 746 (2006) [iii] Production and detection of cold antihydrogen atoms M.Amoretti et al., Nature 419, 456 (2002). [iv]' Antihydrogen formation dynamics in a multipolar neutral anti-atom trap' G.B. Andresen et al., Phys. Lett. B 685, 141 (2010) [v]' Evaporative Cooling of Antiprotons to Cryogenic Temperatures',                                   G.B. Andresen et al. Phys. Rev. Lett 105, 013003 (2010) [vi]'Compression of Antiproton Clouds for Antihydrogen Trapping' G. B. Andresen et al. Phys. Rev. Lett 100, 203401 (2008) [vii]  'Autoresonant Excitation of Antiproton Plasmas' G.B. Andresen et al., Phys. Rev. Lett. 106, 025002 (2011) Organizer: Ferdinand Hahn PH/DT Detector Seminar webpage  

None

2011-04-25T23:59:59.000Z

156

Effect of Trapped Energetic Particles on the Resistive Wall Mode  

SciTech Connect

A stability analysis for the resistive wall mode is studied in the presence of trapped energetic particles (EPs). When the EPs' beta exceeds a critical value, a fishbonelike bursting mode (FLM) with an external kink eigenstructure can exist. This offers the first analytic interpretation of the experimental observations [Phys. Rev. Lett. 103, 045001 (2009)]. The mode-particle resonances for the FLM and the q=1 fishbone occur in different regimes of the precession frequency of EPs. In certain ranges of the plasma rotation speed and the EPs' beta, a mode conversion can occur between the resistive wall mode and FLM.

Hao, G. Z.; Wang, A. K.; Qiu, X. M. [Southwestern Institute of Physics, Post Office Box 432, Chengdu 610041 (China); Liu, Y. Q. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB (United Kingdom)

2011-07-01T23:59:59.000Z

157

Solar light trapping in slanted conical-pore photonic crystals: Beyond statistical ray trapping  

E-Print Network (OSTI)

Solar light trapping in slanted conical-pore photonic crystals: Beyond statistical ray trapping of AIP content is subject to the terms at: http://jap.aip.org/about/rights_and_permissions #12;Solar Street, Toronto, Ontario M5S 1A7, Canada (Received 8 October 2012; accepted 3 April 2013; published

John, Sajeev

158

Modular cryostat for ion trapping with surface-electrode ion traps  

E-Print Network (OSTI)

We present a simple cryostat purpose built for use with surface-electrode ion traps, designed around an affordable, large cooling power commercial pulse tube refrigerator. A modular vacuum enclosure with a single vacuum space facilitates interior access, and enables rapid turnaround and flexiblity for future modifications. Long rectangular windows provide nearly 360 degrees of optical access in the plane of the ion trap, while a circular bottom window near the trap enables NA 0.4 light collection without the need for in-vacuum optics. We evaluate the system's mechanical and thermal characteristics, and we quantify ion trapping performance by trapping 40Ca+, finding small stray electric fields, long ion lifetimes, and low ion heating rates.

Vittorini, Grahame; Brown, Kenneth R; Harter, Alexa W; Doret, S Charles

2013-01-01T23:59:59.000Z

159

Modular cryostat for ion trapping with surface-electrode ion traps  

Science Journals Connector (OSTI)

We present a simple cryostat purpose built for use with surface-electrode ion traps designed around an affordable large cooling power commercial pulse tube refrigerator. A modular vacuum enclosure with a single vacuum space facilitates interior access and enables rapid turnaround and flexibility for future modifications. Long rectangular windows provide nearly 360° of optical access in the plane of the ion trap while a circular bottom window near the trap enables NA 0.4 light collection without the need for in-vacuum optics. We evaluate the system's mechanical and thermal characteristics and we quantify ion trapping performance by trapping 40Ca+ finding small stray electric fields long ion lifetimes and low ion heating rates.

Grahame Vittorini; Kenneth Wright; Kenneth R. Brown; Alexa W. Harter; S. Charles Doret

2013-01-01T23:59:59.000Z

160

Modular cryostat for ion trapping with surface-electrode ion traps  

E-Print Network (OSTI)

We present a simple cryostat purpose built for use with surface-electrode ion traps, designed around an affordable, large cooling power commercial pulse tube refrigerator. A modular vacuum enclosure with a single vacuum space facilitates interior access, and enables rapid turnaround and flexiblity for future modifications. Long rectangular windows provide nearly 360 degrees of optical access in the plane of the ion trap, while a circular bottom window near the trap enables NA 0.4 light collection without the need for in-vacuum optics. We evaluate the system's mechanical and thermal characteristics, and we quantify ion trapping performance by trapping 40Ca+, finding small stray electric fields, long ion lifetimes, and low ion heating rates.

Grahame Vittorini; Kenneth Wright; Kenneth R. Brown; Alexa W. Harter; S. Charles Doret

2013-02-20T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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.


161

Ball-grid array architecture for microfabricated ion traps  

E-Print Network (OSTI)

State-of-the-art microfabricated ion traps for quantum information research are approaching nearly one hundred control electrodes. We report here on the development and testing of a new architecture for microfabricated ion traps, built around ball-grid array (BGA) connections, that is suitable for increasingly complex trap designs. In the BGA trap, through-substrate vias bring electrical signals from the back side of the trap die to the surface trap structure on the top side. Gold-ball bump bonds connect the back side of the trap die to an interposer for signal routing from the carrier. Trench capacitors fabricated into the trap die replace area-intensive surface or edge capacitors. Wirebonds in the BGA architecture are moved to the interposer. These last two features allow the trap die to be reduced to only the area required to produce trapping fields. The smaller trap dimensions allow tight focusing of an addressing laser beam for fast single-qubit rotations. Performance of the BGA trap as characterized with $^{40}$Ca$^+$ ions is comparable to previous surface-electrode traps in terms of ion heating rate, mode frequency stability, and storage lifetime. We demonstrate two-qubit entanglement operations with $^{171}$Yb$^+$ ions in a second BGA trap.

Nicholas D. Guise; Spencer D. Fallek; Kelly E. Stevens; K. R. Brown; Curtis Volin; Alexa W. Harter; Jason M. Amini; Robert E. Higashi; Son Thai Lu; Helen M. Chanhvongsak; Thi A. Nguyen; Matthew S. Marcus; Thomas R. Ohnstein; Daniel W. Youngner

2014-12-19T23:59:59.000Z

162

Charge trapping in imidazolium ionic liquids  

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

trapping in imidazolium ionic liquids trapping in imidazolium ionic liquids I. A. Shkrob and J. F. Wishart J. Phys. Chem. B 113, 5582-5592 (2009). [Find paper at ACS Publications] or use ACS Articles on Request Abstract: Room-temperature ionic liquids (ILs) are a promising class of solvents for applications ranging from photovoltaics to solvent extractions. Some of these applications involve the exposure of the ILs to ionizing radiation, which stimulates interest in their radiation and photo- chemistry. In the case of ILs consisting of 1,3-dialkylimidazolium cations and hydrophobic anions, ionization, charge transfer and redox reactions yield charge-trapped species thought to be radicals resulting from neutralization of the constituent ions. Using computational chemistry methods and the recent results on electron spin resonance (ESR) and transient absorption

163

Cavity cooling of an optically trapped nanoparticle  

Science Journals Connector (OSTI)

We study the cooling of a dielectric nanoscale particle trapped in an optical cavity. We derive the frictional force for motion in the cavity field and show that the cooling rate is proportional to the square of oscillation amplitude and frequency. Both the radial and axial components of the center-of-mass motion of the trapped particle, which are coupled by the cavity field, are cooled. This motion is analogous to two coupled but damped pendulums. Our simulations show that the nanosphere can be cooled to e-1 of its initial momentum over time scales of hundredths of milliseconds.

P. F. Barker and M. N. Shneider

2010-02-23T23:59:59.000Z

164

Thermal electric vapor trap arrangement and method  

DOE Patents (OSTI)

A technique for trapping vapor within a section of a tube is disclosed herein. This technique utilizes a conventional, readily providable thermal electric device having a hot side and a cold side and means for powering the device to accomplish this. The cold side of this device is positioned sufficiently close to a predetermined section of the tube and is made sufficiently cold so that any condensable vapor passing through the predetermined tube section is condensed and trapped, preferably within the predetermined tube section itself. 4 figs.

Alger, T.

1988-03-15T23:59:59.000Z

165

Ultrasensitive Voltammetric Detection of Trace Heavy Metal Ions...  

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

Voltammetric Detection of Trace Heavy Metal Ions Using Carbon Nanotube Nanoelectrode Array. Ultrasensitive Voltammetric Detection of Trace Heavy Metal Ions Using Carbon Nanotube...

166

Infrared near-field spectroscopy of trace explosives using an...  

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

spectroscopy of trace explosives using an external cavity quantum cascade laser. Infrared near-field spectroscopy of trace explosives using an external cavity quantum...

167

Characterization of Trapped Lignin-Degrading Microbes in Tropical Forest Soil  

E-Print Network (OSTI)

Characterization of Trapped Lignin-Degrading Microbes inCharacterization of Trapped Lignin-Degrading Microbes inCharacterization of Trapped Lignin-Degrading Microbes in

DeAngelis, Kristen

2012-01-01T23:59:59.000Z

168

Extraction of trace metals from fly ash  

DOE Patents (OSTI)

A process is described for recovering silver, gallium and/or other trace metals from a fine grained industrial fly ash associated with a process for producing phosphorous. The fly ash has a silicate base and contains surface deposits of the trace metals as oxides, chlorides or the like. The process is carried out by contacting the fly ash with AlCl/sub 3/ in an alkali halide melt to react the trace metals with the AlCl/sub 3/ to form compositions soluble in the melt and a residue containing the silicate and aluminum oxide or other aluminum precipitate, and separating the desired trace metal or metals from the melt by electrolysis or other separation techniques.

Blander, M.; Wai, C.M.; Nagy, Z.

1983-08-15T23:59:59.000Z

169

Extraction of trace metals from fly ash  

DOE Patents (OSTI)

A process for recovering silver, gallium and/or other trace metals from a fine grained industrial fly ash associated with a process for producing phosphorous, the fly ash having a silicate base and containing surface deposits of the trace metals as oxides, chlorides or the like, with the process being carried out by contacting the fly ash with AlCl.sub.3 in an alkali halide melt to react the trace metals with the AlCl.sub.3 to form compositions soluble in the melt and a residue containing the silicate and aluminum oxide or other aluminum precipitate, and separating the desired trace metal or metals from the melt by electrolysis or other separation techniques.

Blander, Milton (Palos Park, IL); Wai, Chien M. (Moscow, ID); Nagy, Zoltan (Woodridge, IL)

1984-01-01T23:59:59.000Z

170

Trace Element Geochemical Zoning in the Roosevelt Hot Springs Thermal Area,  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Trace Element Geochemical Zoning in the Roosevelt Hot Springs Thermal Area, Utah Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Trace Element Geochemical Zoning in the Roosevelt Hot Springs Thermal Area, Utah Abstract Chemical interaction of thermal brines with reservoir rock in the Roosevelt Hot Springs thermal area has resulted in the development of distinctive trace element signatures. Geochemical analysis of soil sample, shallow temperature gradient drill hole cuttings and deep drill hole cutting provides a three dimensional perspective of trace element distributions within the system. Distributions of As, Hg and Li provide the clearest expression of hydrothermal activity. Comparison of these distribution

171

CP-violating CFT and trace anomaly  

E-Print Network (OSTI)

It is logically possible that the trace anomaly in four dimension includes the Hirzebruch-Pontryagin density in CP violating theories. Although the term vanishes at free conformal fixed points, we realize such a possibility in the holographic renormalization group and show that it is indeed possible. The Hirzebruch-Pontryagin term in the trace anomaly may serve as a barometer to understand how much CP is violated in conformal field theories.

Yu Nakayama

2012-01-17T23:59:59.000Z

172

Exciton self-trapping in bulk polyethylene  

E-Print Network (OSTI)

We studied theoretically the behavior of an injected electron-hole pair in crystalline polyethylene. Time-dependent adiabatic evolution by ab-initio molecular dynamics simulations show that the pair will become self-trapped in the perfect crystal, with a trapping energy of about 0.38 eV, with formation of a pair of trans-gauche conformational defects, three C$_2$H$_4$ units apart on the same chain. The electron is confined in the inter-chain pocket created by a local, 120$^\\circ$ rotation of the chain between the two defects, while the hole resides on the chain and is much less bound. Despite the large energy stored in the trapped excitation, there does not appear to be a direct non-radiative channel for electron-hole recombination. This suggests that intrinsic self-trapping of electron-hole pairs inside the ideal quasi-crystalline fraction of PE might not be directly relevant for electrical damage in high-voltage cables.

D. Ceresoli; M. C. Righi; E. Tosatti; S. Scandolo; G. Santoro; S. Serra

2005-07-13T23:59:59.000Z

173

Quantum Stochastic Heating of a Trapped Ion  

E-Print Network (OSTI)

The resonant heating of a harmonically trapped ion by a standing-wave light field is described as a quantum stochastic process combining a coherent Schroedinger evolution with Bohr-Einstein quantum jumps. Quantum and semi-quantum treatments are compared.

L. Horvath; R. Fisher; M. J. Collett; H. J. Carmichael

2007-11-09T23:59:59.000Z

174

Magneto-Optic Trapping of 210Fr  

Science Journals Connector (OSTI)

The alkali element francium has no stable isotopes and has eluded extensive study because sufficient quantities have not been available for detailed investigations. More than 1000 210Fr atoms have now been contained in a magneto-optic trap. This number is sufficient to allow extensive studies of Fr atomic properties that are necessary input for future tests of fundamental interactions.

J. E. Simsarian; A. Ghosh; G. Gwinner; L. A. Orozco; G. D. Sprouse; P. A. Voytas

1996-05-06T23:59:59.000Z

175

On the feasibility of electron cyclotron heating of overcritical plasma in a magnetic mirror trap  

SciTech Connect

The feasibility of matching electromagnetic radiation in the electron cyclotron frequency range to a dense plasma in an open magnetic trap by producing an inverted (with a minimum on the axis) plasma density profile is discussed. The use of such a profile shows promise for the implementation of efficient cyclotron heating at plasma densities above the critical density, at which the Langmuir frequency is equal to the heating radiation frequency. Examples of the magnetic field and plasma density distributions in a mirror trap are presented for which analysis of the beam trajectories shows the feasibility of efficient electron cyclotron absorption of microwave beams in overcritical plasma.

Vodopyanov, A. V.; Golubev, S. V.; Gospodchikov, E. D.; Smolyakova, O. B.; Suvorov, E. V. [Russian Academy of Sciences, Institute of Applied Physics (Russian Federation)

2012-06-15T23:59:59.000Z

176

Efficient light-trapping nanostructures in thin silicon solar cells  

E-Print Network (OSTI)

We examine light-trapping in thin crystalline silicon periodic nanostructures for solar cell applications. Using group theory, we show that light-trapping can be improved over a broad band when structural mirror symmetry ...

Han, Sang Eon

177

Carbon dioxide dissolution in structural and stratigraphic traps  

E-Print Network (OSTI)

The geologic sequestration of carbon dioxide (CO[subscript 2]) in structural and stratigraphic traps is a viable option to reduce anthropogenic emissions. While dissolution of the CO[subscript 2] stored in these traps ...

Hesse, M. A.

178

Energy Conservation Thru Steam Trap Surveys and Preventive Maintenance Programs  

E-Print Network (OSTI)

ENERGY CONSERVATION THRU STEAM TRAP SURVEYS AND PREVENTIVE MAINTENANCE PROGRAMS Terry Boynton, Armstrong, Three Rivers, Mich. Bob Dewhirst, Armstrong, New Braunfels, Texas. This paper will deal with steam trap surveys and preventive maintenance...

Boynton, T.; Dewhirst, B.

1980-01-01T23:59:59.000Z

179

Effective Steam Trap Selection/Maintenance - Its Payback  

E-Print Network (OSTI)

In oil refineries and petrochemical plants large number of steam traps are used to discharge condensate from steam mains, tracers and process equipment. Early efforts on steam traps focused almost exclusively on their selection and sizing...

Garcia, E.

1984-01-01T23:59:59.000Z

180

In-Vacuum Active Electronics for Microfabricated Ion Traps  

E-Print Network (OSTI)

The advent of microfabricated ion traps for the quantum information community has allowed research groups to build traps that incorporate an unprecedented number of trapping zones. However, as device complexity has grown, the number of digital-to-analog converter (DAC) channels needed to control these devices has grown as well, with some of the largest trap assemblies now requiring nearly one hundred DAC channels. Providing electrical connections for these channels into a vacuum chamber can be bulky and difficult to scale beyond the current numbers of trap electrodes. This paper reports on the development and testing of an in-vacuum DAC system that uses only 9 vacuum feedthrough connections to control a 78-electrode microfabricated ion trap. The system is characterized by trapping single and multiple $^{40}$Ca$^+$ ions. The measured axial mode stability, ion heating rates, and transport fidelities for a trapped ion are comparable to systems with external(air-side) commercial DACs.

Nicholas D. Guise; Spencer D. Fallek; Harley Hayden; C-S Pai; Curtis Volin; K. R. Brown; J. True Merrill; Alexa W. Harter; Jason M. Amini; Lisa M. Lust; Kelly Muldoon; Doug Carlson; Jerry Budach

2014-06-02T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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.


181

Single microbe trap and release in sub-microfluidics. | EMSL  

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

Single microbe trap and release in sub-microfluidics. Single microbe trap and release in sub-microfluidics. Abstract: Lab-on-a-chip systems have substantially impacted the way...

182

East Taft Field, San Patricio County, Texas - a subtle stratigraphic trap: implications for exploration in a supermature province  

SciTech Connect

The shallow upper Frio producing trend along the downthrown side of the Vicksburg flexure in the lower Texas Gulf Coast is certainly one of the world's supermature provinces for oil and gas exploration. Current emphasis in exploration must be for the subtle trap, the discovery of which has been selected against during the many years of intensive exploration. East Taft field is an excellent example of one such subtle trap. A stratigraphic oil accumulation in a barrier-bar washover sand, East Taft has produced 2.5 million bbl of oil from 35 wells completed in an average of 3 ft of net oil sand. Traps of this type are numerous along the trend due to the nature of the barrier-bar and adjacent lagoonal environments. These traps remain largely undiscovered because they are never specifically explored for and are commonly passed over as noncommercial when penetrated by wells. The economic potential of these subtle traps is enormous; however, exploration programs geared toward finding these reserves must realistically assess the unique risks involved. Innovative geologic and engineering practices will also be required to discover and develop these fields profitably. For the explorationist who is willing to do the detailed structural and stratigraphic analysis required to identify these prospects, who understands the risks involved in exploration for these traps, and who is willing to innovate, these subtle stratigraphic traps represent a new frontier in an old producing province.

Railsback, R.R.

1986-07-01T23:59:59.000Z

183

The Rajahmundry Traps, Andhra Pradesh: Evaluation of their petrogenesis relative to the Deccan Traps  

Science Journals Connector (OSTI)

Geochemical and geochronological data for rocks from the Rajahmundry Traps, are evaluated for possible correlation with the main Deccan province. Lava flows are found on both banks of the Godavari River and co...

Ajoy K. Baksi

2001-12-01T23:59:59.000Z

184

E B UNA-TRAP FISHERY E E ITERRANEAN SEA  

E-Print Network (OSTI)

of the bag of the trap to concentrate the tuna prior to capture. Photo supplied by Dr. Alonzo Palau, Genova

185

Rotating-radio-frequency ion traps T. Hasegawa*  

E-Print Network (OSTI)

rf ion trap, the rotating-radio-frequency rotating-rf trap, in which the motion of a charged particleRotating-radio-frequency ion traps T. Hasegawa* Department of Physics, Keio University, Kanagawa and Technology, Boulder, Colorado 80305, USA Received 9 July 2005; published 20 October 2005 We discuss a radio-frequency

186

Magnetic trapping of metastable 3 P2 atomic strontium  

E-Print Network (OSTI)

Magnetic trapping of metastable 3 P2 atomic strontium S. B. Nagel, C. E. Simien, S. Laha, P. Gupta trapping of metastable 3 P2 atomic strontium. Atoms are cooled in a magneto-optical trap MOT operating cooling on such a transition in strontium may lead to a fast and efficient route to all-optical quantum

Killian, Thomas C.

187

Fundamental limit of nanophotonic light trapping in solar cells  

E-Print Network (OSTI)

Fundamental limit of nanophotonic light trapping in solar cells Zongfu Yu1 , Aaswath Raman and is becoming increasingly urgent for current solar cell research. The standard theory of light trapping) Establishing the fundamental limit of nanophotonic light-trapping schemes is of paramount importance

Fan, Shanhui

188

High voltage gas insulated transmission line with continuous particle trapping  

DOE Patents (OSTI)

This invention provides a novel high voltage gas insulated transmission line utilizing insulating supports spaced at intervals with snap-in means for supporting a continuous trapping apparatus and said trapping apparatus having perforations and cutouts to facilitate trapping of contaminating particles and system flexibility.

Cookson, Alan H. (Pittsburgh, PA); Dale, Steinar J. (Monroeville, PA)

1983-01-01T23:59:59.000Z

189

Trapped-ion antennae for the transmission of quantum information  

Science Journals Connector (OSTI)

... Here this interaction is explored using ions or ion strings held in two separate potential wells of a linear segmented ion trap (Fig. 1 ... segmented ion trap (Fig. 1), where the interacting dipoles are produced by the oscillating charges. As the dipole–dipole interaction decreases rapidly with trap separation, it is advantageous ...

M. Harlander; R. Lechner; M. Brownnutt; R. Blatt; W. Hänsel

2011-02-23T23:59:59.000Z

190

Electron tunneling spectroscopy study of electrically active traps in AlGaN/GaN high electron mobility transistors  

SciTech Connect

We investigate the energy levels of electron traps in AlGaN/GaN high electron mobility transistors by the use of electron tunneling spectroscopy. Detailed analysis of a typical spectrum, obtained in a wide gate bias range and with both bias polarities, suggests the existence of electron traps both in the bulk of AlGaN and at the AlGaN/GaN interface. The energy levels of the electron traps have been determined to lie within a 0.5?eV band below the conduction band minimum of AlGaN, and there is strong evidence suggesting that these traps contribute to Frenkel-Poole conduction through the AlGaN barrier.

Yang, Jie, E-mail: jie.yang@yale.edu; Cui, Sharon; Ma, T. P. [Department of Electrical Engineering, Yale University, New Haven, Connecticut 06520 (United States)] [Department of Electrical Engineering, Yale University, New Haven, Connecticut 06520 (United States); Hung, Ting-Hsiang; Nath, Digbijoy; Krishnamoorthy, Sriram; Rajan, Siddharth [Department of Electrical and Computer Engineering, Ohio State University, Columbus, Ohio 43210 (United States)] [Department of Electrical and Computer Engineering, Ohio State University, Columbus, Ohio 43210 (United States)

2013-11-25T23:59:59.000Z

191

Energy Savings with Computerized Steam Trap Maintenance Program  

E-Print Network (OSTI)

by Armstrong International, Inc. Five other manufacturers each have about a 5% share of the tmp population, and about 5 more account for the remaining steam traps. 6,430 STEAM TRAPS COLl3Il~) FIGURE 3 - Steam trap population by application. 8,430 STEAM... standardized using the inverted bucket steam trap made by Armstrong International, Inc. "or equal", with approval, wherever applicable and sensible. I believe the inverted bucket steam trap is the best one for this. The selection of a good manufacturer...

Klidzejs, A. M.

192

Steam Trap Testing and Evaluation: An Actual Plant Case Study  

E-Print Network (OSTI)

on there is a hydraul ic shock in the forn! of a water hammer. The standard trap used at the Olin-Joliet Plant is an Armstrong carbon steel inverted bucket. The hydraulic shock has not only broken the valve assembly on the inverted buckets, but has also... service is what caused the traps to fail closed. The last set of traps tested was the Armstrong 1013LV stainless steel inverted buckets. The capacity of these units required that for each coil two traps in parallel would be required. The traps do...

Feldman, A. L.

1981-01-01T23:59:59.000Z

193

An ion trap built with photonic crystal fibre technology  

E-Print Network (OSTI)

We demonstrate a surface-electrode ion trap fabricated using techniques transferred from the manufacture of photonic-crystal fibres. This provides a relatively straightforward route for realizing traps with an electrode structure on the 100 micron scale with high optical access. We demonstrate the basic functionality of the trap by cooling a single ion to the quantum ground state, allowing us to measure a heating rate from the ground state of 787(24) quanta/s. Variation of the fabrication procedure used here may provide access to traps in this geometry with trap scales between 100 um and 10 um.

Lindenfelser, F; Kienzler, D; Bykov, D; Uebel, P; Schmidt, M A; Russell, P St J; Home, J P

2015-01-01T23:59:59.000Z

194

Use of Bullet Traps and Steel Targets  

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

USE OF BULLET TRAPS AND USE OF BULLET TRAPS AND STEEL TARGETS U.S. DEPARTMENT OF ENERGY Office of Health, Safety and Security AVAILABLE ONLINE AT: INITIATED BY: http://www.hss.energy.gov Office of Health, Safety and Security Notices This document is intended for the exclusive use of elements of the Department of Energy (DOE), to include the National Nuclear Security Administration, their contractors, and other government agencies/individuals authorized to use DOE facilities. DOE disclaims any and all liability for personal injury or property damage due to use of this document in any context by any organization, group, or individual, other than during official government activities. Local DOE management is responsible for the proper execution of firearms-related programs for

195

Nonperturbative Coherent Population Trapping: An Analytic Model  

Science Journals Connector (OSTI)

Coherent population trapping is shown to occur in a driven symmetric double-well potential in the strong-field regime. The system parameters have been chosen to reproduce the 0-?3+ transition of the inversion mode of the ammonia molecule. For a molecule initially prepared in its lower doublet we find that, under certain circumstances, the 3+ level remains unpopulated, and this occurs in spite of the fact that the laser field is resonant with the 0-?3+ transition and intense enough so as to strongly mix the 0+ and 0- ground states. This counterintuitive result constitutes a coherent population trapping phenomenon of nonperturbative origin which cannot be accounted for with the usual models.

V. Delgado and J. M. Gomez Llorente

2002-01-23T23:59:59.000Z

196

Shortcuts to adiabaticity for trapped ultracold gases  

E-Print Network (OSTI)

We study, experimentally and theoretically, the controlled transfer of harmonically trapped ultracold gases between different quantum states. In particular we experimentally demonstrate a fast decompression and displacement of both a non-interacting gas and an interacting Bose-Einstein condensate which are initially at equilibrium. The decompression parameters are engineered such that the final state is identical to that obtained after a perfectly adiabatic transformation despite the fact that the fast decompression is performed in the strongly non-adiabatic regime. During the transfer the atomic sample goes through strongly out-of-equilibrium states while the external confinement is modified until the system reaches the desired stationary state. The scheme is theoretically based on the invariants of motion and scaling equations techniques and can be generalized to decompression trajectories including an arbitrary deformation of the trap. It is also directly applicable to arbitrary initial non-equilibrium sta...

Schaff, Jean-François; Labeyrie, Guillaume; Vignolo, Patrizia

2011-01-01T23:59:59.000Z

197

Shortcuts to adiabaticity for trapped ultracold gases  

E-Print Network (OSTI)

We study, experimentally and theoretically, the controlled transfer of harmonically trapped ultracold gases between different quantum states. In particular we experimentally demonstrate a fast decompression and displacement of both a non-interacting gas and an interacting Bose-Einstein condensate which are initially at equilibrium. The decompression parameters are engineered such that the final state is identical to that obtained after a perfectly adiabatic transformation despite the fact that the fast decompression is performed in the strongly non-adiabatic regime. During the transfer the atomic sample goes through strongly out-of-equilibrium states while the external confinement is modified until the system reaches the desired stationary state. The scheme is theoretically based on the invariants of motion and scaling equations techniques and can be generalized to decompression trajectories including an arbitrary deformation of the trap. It is also directly applicable to arbitrary initial non-equilibrium states.

Jean-François Schaff; Pablo Capuzzi; Guillaume Labeyrie; Patrizia Vignolo

2011-05-11T23:59:59.000Z

198

Magneto-Optical Trapping of Holmium Atoms  

E-Print Network (OSTI)

We demonstrate sub-Doppler laser cooling and magneto-optical trapping of the rare earth element Holmium. Atoms are loaded from an atomic beam source and captured in six-beam $\\sigma_+ - \\sigma_-$ molasses using a strong $J=15/2 \\leftrightarrow J=17/2$ cycling transition at $\\lambda=410.5 \\rm nm$. Due to the small difference in hyperfine splittings and Land\\'e $g$-factors in the lower and upper levels of the cooling transition the MOT is self-repumped without additional repump light, and deep sub-Doppler cooling is achieved with the magnetic trap turned on. We measure the leakage out of the cycling transition to metastable states and find a branching ratio $\\sim 10^{-5}$ which is adequate for state resolved measurements on hyperfine encoded qubits.

J. Miao; J. Hostetter; G. Stratis; M. Saffman

2014-03-24T23:59:59.000Z

199

Trapped ghosts: a new class of wormholes  

E-Print Network (OSTI)

We construct examples of static, spherically symmetric wormhole solutions in general relativity with a minimally coupled scalar field $\\phi$ whose kinetic energy is negative in a restricted region of space near the throat (of arbitrary size) and positive far from it. Thus in such configurations a "ghost" is trapped in the strong-field region, which may in principle explain why no ghosts are observed under usual conditions. Some properties of general wormhole models with the $\\phi$ field are revealed: it is shown that (i) trapped-ghost wormholes are only possible with nonzero potentials $V(\\phi)$; (ii) in twice asymptotically flat wormholes, a nontrivial potential $V(\\phi)$ has an alternate sign, and (iii) a twice asymptotically flat wormhole which is mirror-symmetric with respect to its throat has necessarily a zero Schwarzschild mass at both asymptotics.

Kirill A. Bronnikov; Sergey V. Sushkov

2010-01-20T23:59:59.000Z

200

Trapped ghosts: a new class of wormholes  

E-Print Network (OSTI)

We construct examples of static, spherically symmetric wormhole solutions in general relativity with a minimally coupled scalar field $\\phi$ whose kinetic energy is negative in a restricted region of space near the throat (of arbitrary size) and positive far from it. Thus in such configurations a "ghost" is trapped in the strong-field region, which may in principle explain why no ghosts are observed under usual conditions. Some properties of general wormhole models with the $\\phi$ field are revealed: it is shown that (i) trapped-ghost wormholes are only possible with nonzero potentials $V(\\phi)$; (ii) in twice asymptotically flat wormholes, a nontrivial potential $V(\\phi)$ has an alternate sign, and (iii) a twice asymptotically flat wormhole which is mirror-symmetric with respect to its throat has necessarily a zero Schwarzschild mass at both asymptotics.

Bronnikov, Kirill A

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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.


201

Ion temperature gradient driven turbulence with strong trapped ion resonance  

SciTech Connect

A theory to describe basic characterization of ion temperature gradient driven turbulence with strong trapped ion resonance is presented. The role of trapped ion granulations, clusters of trapped ions correlated by precession resonance, is the focus. Microscopically, the presence of trapped ion granulations leads to a sharp (logarithmic) divergence of two point phase space density correlation at small scales. Macroscopically, trapped ion granulations excite potential fluctuations that do not satisfy dispersion relation and so broaden frequency spectrum. The line width from emission due only to trapped ion granulations is calculated. The result shows that the line width depends on ion free energy and electron dissipation, which implies that non-adiabatic electrons are essential to recover non-trivial dynamics of trapped ion granulations. Relevant testable predictions are summarized.

Kosuga, Y., E-mail: kosuga@riam.kyushu-u.ac.jp [Institute for Advanced Study, Kyushu University, Fukuoka (Japan); Research Institute for Applied Mechanics, Kyushu University, Fukuoka (Japan); Itoh, S.-I. [Research Center for Plasma Turbulence, Kyushu University, Fukuoka (Japan); Research Institute for Applied Mechanics, Kyushu University, Fukuoka (Japan); Diamond, P. H. [CASS and CMTFO, University of California at San Diego, La Jolla, California 92093 (United States); WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon (Korea, Republic of); Itoh, K. [National Institute for Fusion Science, Gifu (Japan); Research Center for Plasma Turbulence, Kyushu University, Fukuoka (Japan); Lesur, M. [Research Institute for Applied Mechanics, Kyushu University, Fukuoka (Japan)

2014-10-15T23:59:59.000Z

202

Ray tracing of Jovian kilometric radiation  

SciTech Connect

Results of computer ray tracing of Jovian kilometric from 56.2 kHz to 1 MHz in a model Jovian magnetosphere with an Io torus are presented. Ray tracing calculations indicate that the Io torus presents a propagation barrier to the radiation and that the Jovian kilometric radiation must be generated in the L-O mode from a source near Jupiter on field lines passing through the Io torus. One effect of the Io torus is to refract the rays away from the magnetic equator forming a shadow zone at radial distances beyond the torus. In general, at radial distances greater than 10 Jovian radii, as the wave frequency increases (>200 kHz) so does the magnetic latitude of the shadow zone. These and other features of the ray tracing calculations are in good qualitative agreement with the observations from the plasma wave receiver and planetary radio astronomy experiment on board both Voyager 1 and 2.

Green, J.L.; Gurnett, D.A.

1980-01-01T23:59:59.000Z

203

Subtask 4.27 - Evaluation of the Multielement Sorbent Trap (MEST) Method at an Illinois Coal-Fired Plant  

SciTech Connect

Owners of fossil fuel-fired power plants face the challenge of measuring stack emissions of trace metals and acid gases at much lower levels than in the past as a result of increasingly stringent regulations. In the United States, the current reference methods for trace metals and halogens are wet-chemistry methods, U.S. Environmental Protection Agency (EPA) Methods 29 and 26 or 26A, respectively. As a possible alternative to the EPA methods, the Energy & Environmental Research Center (EERC) has developed a novel multielement sorbent trap (MEST) method to be used to sample for trace elements and/or halogens. Sorbent traps offer a potentially advantageous alternative to the existing sampling methods, as they are simpler to use and do not require expensive, breakable glassware or handling and shipping of hazardous reagents. Field tests comparing two sorbent trap applications (MEST-H for hydrochloric acid and MEST-M for trace metals) with the reference methods were conducted at two power plant units fueled by Illinois Basin bituminous coal. For hydrochloric acid, MEST measured concentrations comparable to EPA Method 26A at two power plant units, one with and one without a wet flue gas desulfurization scrubber. MEST-H provided lower detection limits for hydrochloric acid than the reference method. Results from a dry stack unit had better comparability between methods than results from a wet stack unit. This result was attributed to the very low emissions in the latter unit, as well as the difficulty of sampling in a saturated flue gas. Based on these results, the MEST-H sorbent traps appear to be a good candidate to serve as an alternative to Method 26A (or 26). For metals, the MEST trap gave lower detection limits compared to EPA Method 29 and produced comparable data for antimony, arsenic, beryllium, cobalt, manganese, selenium, and mercury for most test runs. However, the sorbent material produced elevated blanks for cadmium, nickel, lead, and chromium at levels that would interfere with accurate measurement at U.S. hazardous air pollutant emission limits for existing coal-fired power plant units. Longer sampling times employed during this test program did appear to improve comparative results for these metals. Although the sorbent contribution to the sample was reduced through improved trap design, additional research is still needed to explore lower-background materials before the MEST-M application can be considered as a potential alternative method for all of the trace metals. This subtask was funded through the EERC–U.S. Department of Energy Joint Program on Research and Development for Fossil Energy-Related Resources Cooperative Agreement No. DE-FC26-08NT43291. Nonfederal funding was provided by the Electric Power Research Institute, the Illinois Clean Coal Institute, Southern Illinois Power Company, and the Center for Air Toxic Metals Affiliates Program.

Pavlish, John; Thompson, Jeffrey; Dunham, Grant

2014-09-30T23:59:59.000Z

204

Building Energy Software Tools Directory: TRACE 700  

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

700 700 TRACE 700 logo. Trane's TRACE 700 software - the latest version of Trane Air Conditioning Economics - brings the algorithms recommended by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) to the familiar Windows operating environment. Use it to assess the energy and economic impacts of building-related selections such as architectural features, comfort-system design, HVAC equipment selections, operating schedules, and financial options. Flexible data entry, coupled with multiple views and "drag-and-drop" load assignments, simplify the modeling process and help you identify optimal zoning and plant configurations. Compare up to four alternatives for a single project by modeling various air distribution and mechanical

205

Trace fossil assemblages in selected shelf sandstones  

E-Print Network (OSTI)

with progradation of the delta. The presence of trace fossils throughout the section, as compared to the lack of burrows in the upper unit of the True Watt A-1 section, can be attributed to the marginal location of the deposits. Santa Fe 13 and Santa Fe 10... with progradation of the delta. The presence of trace fossils throughout the section, as compared to the lack of burrows in the upper unit of the True Watt A-1 section, can be attributed to the marginal location of the deposits. Santa Fe 13 and Santa Fe 10...

Locke, Kathleen Ann

2012-06-07T23:59:59.000Z

206

Tracing compressed curves in triangulated surfaces  

Science Journals Connector (OSTI)

A simple path or cycle in a triangulated surface is normal if it intersects any triangle in a finite set of arcs, each crossing from one edge of the triangle to another. We describe an algorithm to "trace" a normal curve in O(min set{X, n2log ... Keywords: computational topology, geodesics, normal coordinates

Jeff Erickson; Amir Nayyeri

2012-06-01T23:59:59.000Z

207

Amounts of Trace Elements in Marine Cephalopods  

Science Journals Connector (OSTI)

......Amounts of Trace Elements in Marine Cephalopods T. Ueda * M. Nakahara...H. Suzuki ** * Division of Marine Radioecology, National Institute...Power Reactor and Nuclear Fuel Development Cooperation, Tokyo...Co and Cs in 5 species of marine cephalopods were determined......

T. Ueda; M. Nakahara; T. Ishii; Y. Suzuki; H. Suzuki

1979-12-01T23:59:59.000Z

208

Nuclear and Trace Ideals in Tensored \\LambdaCategories Samson Abramsky \\Lambda  

E-Print Network (OSTI)

Nuclear and Trace Ideals in Tensored \\Lambda­Categories Samson Abramsky \\Lambda Department of his 60th birthday. Abstract We generalize the notion of nuclear maps from functional analysis by defining nuclear ideals in tensored \\Lambda­categories. The motivation for this study came from attempts

Blute, Richard

209

Comparative bioaccumulation of trace elements between Nautilus pompilius and N.1 macromphalus (Cephalopoda: Nautiloidea) from Vanuatu and New-Caledonia2  

E-Print Network (OSTI)

clearly highlighted that the digestive gland32 played a key role in the bioaccumulation and storage of Ag are exposed to trace elements that are present in their diet and dissolved in49 seawater. This double exposure bioavailability of53 the metal in diet and seawater (Rainbow and Wang, 2001). Comparative analysis of trace54

Paris-Sud XI, Université de

210

Gas turbine engines with particle traps  

DOE Patents (OSTI)

A gas turbine engine (10) incorporates a particle trap (46) that forms an entrapment region (73) in a plenum (24) which extends from within the combustor (18) to the inlet (32) of a radial-inflow turbine (52, 54). The engine (10) is thereby adapted to entrap particles that originate downstream from the compressor (14) and are otherwise propelled by combustion gas (22) into the turbine (52, 54). Carbonaceous particles that are dislodged from the inner wall (50) of the combustor (18) are incinerated within the entrapment region (73) during operation of the engine (10).

Boyd, Gary L. (Tempe, AZ); Sumner, D. Warren (Phoenix, AZ); Sheoran, Yogendra (Scottsdale, AZ); Judd, Z. Daniel (Phoenix, AZ)

1992-01-01T23:59:59.000Z

211

New nano trap protects environment | Argonne National Laboratory  

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

New nano trap protects environment New nano trap protects environment By Tona Kunz * October 31, 2012 Tweet EmailPrint This story was originally published in volume 10, number 5 of Innovation magazine. A new type of nanoscale molecular trap makes it possible for industry to store large amounts of hydrogen in small fuel cells or capture, compact and remove volatile radioactive gas from spent nuclear fuel in an affordable, easily commercialized way. The ability to adjust the size of the trap openings to select for specific molecules or to alter how molecules are released at industrially accessible pressures makes the trap uniquely versatile. The trap is constructed of commercially available material and made possible through collaborative work at Argonne and Sandia national laboratories. "This introduces a new class of materials to nuclear waste remediation,"

212

Vertical and horizontal fluxes of selected radionuclides and trace metals off the coast of southern California  

SciTech Connect

The overall objective of our research, within the structure of the CaBS program, is to understand the transport pathways and mass balances of some metabolically-active and inactive chemical species in the Santa Monica/San Pedro (SM/SP) Basin. Our focus is to examine selected trace metals and radionuclides in seawater, sediment trap material, and bottom sediments. Knowledge of the inventories, fluxes, and routes of these nuclides and metals in or among these reservoirs should lead to a cogent model for these elements in SM/SP Basin, which in turn should shed light on the fate and effects of energy-related by-products in a coastal region impacted by intense human activities. 4 figs., 3 tabs.

Huh, C.-A.

1990-01-01T23:59:59.000Z

213

Runtime Tracing of The Community Earth System Model: Feasibility and Benefits  

SciTech Connect

Community Earth System Models (CESM) is one of US's leading earth system modeling systems, which has over decades of development history and embraced by large, active user communities. In this paper, we first review the history of CESM software development and layout the general objectives of performance analysis. Then we present an offline global community land model simulation within the CESM framework to demonstrate the procedure of runtime tracing of CESM using the Vampir toolset. Finally, we explain the benefits of runtime tracing to the general earth system modeling community. We hope those considerations can also be beneficial to many other modeling research programs involving legacy high-performance computing applications.

Wang, Dali [ORNL] [ORNL; Domke, Jens [ORNL] [ORNL

2011-01-01T23:59:59.000Z

214

E-Print Network 3.0 - atmospheric trace element Sample Search...  

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

Summary: 6 2.0 Sources and Deposition of Trace Metals Trace elements enter the atmosphere via both natural... 5 Chapter 2: Sources and Deposition of Trace Metals...

215

T-720: Blue Coat Director HTTP Trace Processing Flaw Permits...  

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

0: Blue Coat Director HTTP Trace Processing Flaw Permits Cross-Site Scripting Attacks T-720: Blue Coat Director HTTP Trace Processing Flaw Permits Cross-Site Scripting Attacks...

216

Emittance Measurements of Trapped Electrons from a Plasma Wakefield Accelerator  

SciTech Connect

Recent electron beam driven plasma wakefield accelerator experiments carried out at SLAC showed trapping of plasma electrons. These trapped electrons appeared on an energy spectrometer with smaller transverse size than the beam driving the wake. A connection is made between transverse size and emittance; due to the spectrometer's resolution, this connection allows for placing an upper limit on the trapped electron emittance. The upper limit for the lowest normalized emittance measured in the experiment is 1 mm {center_dot} mrad.

Kirby, N.; Berry, M.; Blumenfeld, I.; Decker, F.-J.; Hogan, M.J.; Ischebeck, R.; Iverson, R.; Siemann, R.; Walz, D.; /SLAC; Clayton, C.E.; Huang, C.; Joshi, C.; Lu, W.; Marsh, K.A.; Mori, W.B.; Zhou, M.; /UCLA; Katsouleas, T.C.; Muggli, P.; Oz, E.; /Southern California U.

2007-06-28T23:59:59.000Z

217

Decoherence in a single trapped ion due to engineered reservoir  

E-Print Network (OSTI)

The decoherence in trapped ion induced by coupling the ion to the engineered reservoir is studied in this paper. The engineered reservoir is simulated by random variations in the trap frequency, and the trapped ion is treated as a two-level system driven by a far off-resonant plane wave laser field. The dependence of the decoherence rate on the amplitude of the superposition state is given.

X. X. Yi; D. L. Zhou; C. P. Sun

2000-04-18T23:59:59.000Z

218

Gas insulated transmission line having tapered particle trapping ring  

DOE Patents (OSTI)

A gas-insulated transmission line includes an outer sheath, an inner conductor, insulating supports and an insulating gas. A particle-trapping ring is secured to each insulating support, and it is comprised of a central portion and two tapered end portions. The ends of the particle trapping ring have a smaller diameter than the central portion of the ring, so as to enable the use of the particle trapping ring in a curved transmission line.

Cookson, Alan H. (Pittsburgh, PA)

1982-01-01T23:59:59.000Z

219

Fundamental Limit of Nanophotonic Light-Trapping in Solar Cells  

Science Journals Connector (OSTI)

We use a rigorous electromagnetic approach to develop a light-trapping theory, which reveals that the conventional limit 4n2can be substantially surpassed in nanophotonic...

Yu, Zongfu; Raman, Aaswath; Fan, Shanhui

220

Neutron-Mirror-Neutron Oscillations in a Trap  

E-Print Network (OSTI)

We calculate the rate of neutron-mirror-neutron oscillations for ultracold neutrons trapped in a storage vessel. Recent experimental bounds on the oscillation time are discussed.

B. Kerbikov; O. Lychkovskiy

2008-04-03T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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

Neutron–mirror-neutron oscillations in a trap  

Science Journals Connector (OSTI)

We calculate the rate of neutron–mirror-neutron oscillations for ultracold neutrons trapped in a storage vessel. Recent experimental bounds on the oscillation time are discussed.

B. Kerbikov and O. Lychkovskiy

2008-06-27T23:59:59.000Z

222

Requirements-Driven Diesel Catalyzed Particulate Trap Design...  

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

Driven Diesel Catalyzed Particulate Trap (DCPT) Design and Optimization Tom Harris, Donna McConnell and Danan Dou Delphi Catalyst Tulsa, Oklahoma 2 Euro 45 Light Duty...

223

Dielectric nanostructures for broadband light trapping in organic solar cells  

Science Journals Connector (OSTI)

We investigate broadband light trapping using only dielectric components to improve organic solar cell efficiency. We show that substantial absorption and photocurrent enhancement is...

Raman, Aaswath; Yu, Zongfu; Fan, Shanhui

224

Variational calculation of the trapping rate in thermal barriers  

SciTech Connect

A variational calculation of the trapping rate and trapped ion density in thermal barriers is presented. The effects of diffusion in energy as well as pitch angle scattering are retained. The variational formulation uses the actual trapped-passing boundary in velocity space. The boundary condition is that the trapped ion distribution function matches the passing ion distribution function, which is taken to be a Maxwellian, on the boundary. The results compare well with two-dimensional Fokker-Planck code calculations by Futch and LoDestro.

Li, X.Z.; Emmert, G.A.

1982-10-01T23:59:59.000Z

225

Investigation of Aging Mechanisms in Lean NOx Traps | Department...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

"Mega" Merit Review 2008 on February 25, 2008 in Bethesda, Maryland. merit08johnson.pdf More Documents & Publications Investigation of Aging Mechanisms in Lean NOx Traps...

226

Location Of Hole And Electron Traps On Nanocrystalline Anatase...  

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

to two overlapping distributions: hole trap emission associated with oxygen vacancies on (101) exposed surfaces, which peaks in the green, and a broader emission...

227

Characterisation of Dust Particles Trapped in Silica Aerogels.  

E-Print Network (OSTI)

?? This thesis involves the study of dust particles trapped in silica aerogel for fusion dust diagnostics purpose. The low velocity impact experiments are done… (more)

Liu, Bing

2011-01-01T23:59:59.000Z

228

Effect of Microbial Activity on Trace Element Release from Sewage  

E-Print Network (OSTI)

Effect of Microbial Activity on Trace Element Release from Sewage Sludge S H A B N A M Q U R E S H in mobilization of trace elements from land-applied wastewater sludge is not well-defined. Our study examined-effective management alternative. Unfor- tunately, sewage sludge also contains potentially toxic trace elements

Walter, M.Todd

229

Removal of trace olefins from aromatic hydrocarbons  

SciTech Connect

A process is described for treating a hydrocarbon process stream by converting trace quantities of olefinic impurities to nonolefinic hydrocarbons. The process comprises contacting the process stream, which contains trace olefins in an amount of from about 50 to about 2000 as measured by Bromine Index and at least 80% by weight of aromatic and naphthenic hydrocarbons having from 6 to 20 carbon atoms per molecule, at reaction conditions which ensure liquid phase operation with a solid catalyst composite comprising a crystalline aluminosilicate zeolite and a refractory inorganic oxide. A catalytic olefin-consuming alkylation reaction then produces an essentially olefinfree product stream with approximately the same quantity and distribution of aromatic and naphthenic hydrocarbons as contained in the process stream.

Sachtler, J.W.A.; Barger, P.T.

1989-01-03T23:59:59.000Z

230

Improve reformer operation with trace sulfur removal  

SciTech Connect

Modern bimetallic reforming catalysts typically have feed specifications for sulfur of 0.5 to 1 wppm in the reformer naphtha carge. Sulfur in the raw naphtha is reduced to this level by naphtha hydrotreating. While most naphtha hydrotreating operations can usually obtain these levels without substantial problems. It is difficult to obtain levels much below 0.5 to 1 wppm with this process. Revamp of a constrained existing hydrotreater to reduce product sulfur slightly can be extremely costly typically entailing replacement or addition of a new reactor. At Engelhard the authors demonstrated that if the last traces of sulfur remaining from hydrotreating can be removed, the resulting ultra-low sulfur feed greatly improves the reformer operation and provides substantial economic benefit to the refiner. Removal of the remaining trace sulfur is accomplished in a simple manner with a special adsorbent bed, without adding complexity to the reforming operation.

McClung, R.G.; Novak, W.J.

1987-01-01T23:59:59.000Z

231

HELSINKI UNIVERSITY OF TECHNOLOGY ENE-47.153 Trace elements and alkaliTrace elements and alkali  

E-Print Network (OSTI)

elements in fossil - and waste-derived fuelsTrace elements in fossil - and waste-derived fuels Coal Peat Heavy fuel oil Pet coke MSW RDF Wood Waste wood Waste paper Scrap tyres Sew. sludge Hg 0.02-3 ~0.07 .153 Behaviour of trace elements in coalBehaviour of trace elements in coal combustion flue gasescombustion flue

Zevenhoven, Ron

232

Trace elements in co-combustion of solid recovered fuel and coal  

Science Journals Connector (OSTI)

Trace element partitioning in co-combustion of a bituminous coal and a solid recovered fuel (SRF) was studied in an entrained flow reactor. The experiments were carried out at conditions similar to pulverized coal combustion, with SRF shares of 7.9 wt.% (wet basis), 14.8 wt.% and 25.0 wt.%. In addition, the effect of additives such as NaCl, PVC, ammonium sulphate, and kaolinite on trace element partitioning was investigated. The trace elements studied were As, Cd, Cr, Pb, Sb and Zn, since these elements were significantly enriched in SRF as compared to coal. During the experiments, bottom ash was collected in a chamber, large fly ash particles were collected by a cyclone with a cut-off diameter of ~ 2.5 ?m, and the remaining fly ash particles were gathered in a filter. It was found that when coal was co-fired with SRF, the As, Cd, Pb, Sb and Zn content in filter ash/cyclone ash increased almost linearly with their content in fuel ash. This linear tendency was affected when the fuels were mixed with additives. The volatility of trace elements during combustion was assessed by applying a relative enrichment (RE) factor, and TEM–EDS analysis was conducted to provide qualitative interpretations. The results indicated that As, Cd, Pb, Sb and Zn were highly volatile when co-firing coal and SRF, whereas the volatility of Cr was relatively low. Compared with coal combustion, co-firing of coal and SRF slightly enhanced the volatility of Cd, Pb and Zn, but reduced the volatility of Cr and Sb. The Cl-based additives increased the volatility of Cd, Pb and As, whereas addition of ammonium sulphate generally decreased the volatility of trace elements. Addition of kaolinite reduced the volatility of Pb, while the influence on other trace elements was insignificant. The results from the present work imply that trace element emission would be significantly increased when coal is co-fired with SRF, which may greatly enhance the toxicity of the dusts from coal-fired power plant. In order to minimize trace element emission in co-combustion, in addition to lowering the trace element content in SRF, utilizing SRF with low Cl content and coal with high S and aluminosilicates content would be desirable.

Hao Wu; Peter Glarborg; Flemming Jappe Frandsen; Kim Dam-Johansen; Peter Arendt Jensen; Bo Sander

2013-01-01T23:59:59.000Z

233

Tracing of Error in a Time Series Data  

E-Print Network (OSTI)

A physical (e.g. astrophysical, geophysical, meteorological etc.) data may appear as an output of an experiment or it may contain some sociological, economic or biological information. Whatever be the source of a time series data some amount of noise is always expected to be embedded in it. Analysis of such data in presence of noise may often fail to give accurate information. Although text book data filtering theory is primarily concerned with the presences of random, zero mean errors; but in reality, errors in data are often systematic rather than random. In the present paper we produce different models of systematic error in the time series data. This will certainly help to trace the systematic error present in the data and consequently that can be removed as possible to make the data compatible for further study.

Koushik Ghosh; Probhas Raychaudhuri

2007-01-30T23:59:59.000Z

234

A Microscale Gas Trapping Investigation Markus Buchgraber, Anthony R. Kovscek  

E-Print Network (OSTI)

A Microscale Gas Trapping Investigation Markus Buchgraber, Anthony R. Kovscek Department of Energy unit Residual Trapping Sgi Sg,max krg krg Sgt(Soi) Sgt,max Gas Saturation Gas relative Land Model * * ** 1 )( gi gi gigt CS S SS + = Sgf Sg Sgt,max kd rg Sg Gas Saturation

Stanford University

235

Biodiversity Conservation and Poverty Traps December 2, 2009  

E-Print Network (OSTI)

Biodiversity Conservation and Poverty Traps December 2, 2009 Co-organizers Alex Travis and Chris biodiversity conservation and poverty traps. Multiple participants observed that Cornell has relatively large. A good deal of discussion concerned the emphasis on biodiversity conservation as opposed to broader

Angenent, Lars T.

236

CONTINUOUS FLOW "RAIL-AND-TRAP" MICROFLUIDIC PROCESSORS FOR AUTONOMOUS  

E-Print Network (OSTI)

CONTINUOUS FLOW "RAIL-AND-TRAP" MICROFLUIDIC PROCESSORS FOR AUTONOMOUS BEAD-BASED MIXING laborious and time intensive fluidic mixing procedures. Although microfluidic platforms offer significant, here we present a microfluidic "rail-and-trap" processor that functions autonomously under continuous

Lin, Liwei

237

Trapping of Gun-Injected Plasma by a Tokamak  

Science Journals Connector (OSTI)

It is shown that a plasma produced by a Marshall gun can be injected into and trapped by a tokamak plasma. Gun injection raises the line-averaged density and peaks the density profile. Trapping of the gun-injected plasma is explainable in terms of a depolarization current mechanism.

A. W. Leonard; R. N. Dexter; J. C. Sprott

1986-07-21T23:59:59.000Z

238

Pinch Effect for Trapped Particles in a Tokamak  

Science Journals Connector (OSTI)

Conservation of canonical angular momentum is shown to require that all trapped particles drift towards the magnetic axis with velocity cE?B? (E? is the toroidal electric field; B? the poloidal magnetic field). This property, plus an amplification process for the number of trapped particles, will explain the relaxation oscillations which occur for q3.

A. A. Ware

1970-07-06T23:59:59.000Z

239

Novel Dipole Trapped Spheromak Configuration M. R. Brown,1,  

E-Print Network (OSTI)

Novel Dipole Trapped Spheromak Configuration M. R. Brown,1, * C. D. Cothran,1 J. Fung,1 M. J. Schaffer,2 and E. Belova3 We report the observation and characterization of a spheromak formed in the Swarthmore Spheromak Experiment (SSX) and trapped in a simple dipole magnetic field. The spheromak is studied

Brown, Michael R.

240

Successful Implementation of a Sustainable Trap Management Program.  

E-Print Network (OSTI)

significant cost penalty in delaying implementation of a program to manage the steam trap population. Plants typically embark on a trap management initiative by focusing on a survey, but may not maximize returns because they fail to execute or sustain possible...

Walter, J.

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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

Steam Traps-The Oft Forgotten Energy Conservation Treasure  

E-Print Network (OSTI)

In these days of high technology, the steam trap is often treated as a commodity item, forgotten by many and respected by a relative few. Yet, in many facilities, widespread undetected failure of steam traps has wasted 5-15% of a plant's total steam...

Pychewicz, F. S.

242

Solar cell efficiency enhancement via light trapping in printable resonant  

E-Print Network (OSTI)

Solar cell efficiency enhancement via light trapping in printable resonant dielectric nanosphere for addressing the key challenge of light trapping in thin-film solar cells. We experimentally and theoretically the absorber, junction, and passivation layers. Recently, a number of innovative solar cell light

Atwater, Harry

243

Dielectric nanostructures for broadband light trapping in organic solar cells  

E-Print Network (OSTI)

Dielectric nanostructures for broadband light trapping in organic solar cells Aaswath Raman, Zongfu light trapping configuration for thin-film solar cells," Appl. Phys. Lett. 91, 243501 (2007). 8. M@stanford.edu Abstract: Organic bulk heterojunction solar cells are a promising candidate for low-cost next

Fan, Shanhui

244

Solar cell efficiency enhancement via light trapping in printable resonant  

E-Print Network (OSTI)

Solar cell efficiency enhancement via light trapping in printable resonant dielectric nanosphere for addressing the key challenge of light trapping in thin-film solar cells. We experimentally and theoretically, photovoltaics, resonant dielectric structures, solar cells * Corresponding author: e-mail jgrandid

Grandidier, Jonathan

245

Sympathetic cooling of trapped ions with resonant laser radiation  

SciTech Connect

We propose a novel model to describe dynamic properties of ions that are cooled by collisions with other laser-cooled ions in a quadrupole rf trap. The limit temperature of the sympathetic Cooling is estimated as functions of the trap and laser parameters, and the mass of the ions.

Shimizu, T.; Oshima, Y.; Moriwaki, Y.; Tachikawa, M. [Univ. of Tokyo (Japan)

1994-12-31T23:59:59.000Z

246

Particle-optical self-trapping  

SciTech Connect

The formation of a self-guided beam pattern via optical trapping in a suspension of Rayleigh scatterers is studied. An analytic self-guided solution is presented that is valid for low intensities. A numerical solution of the coupled diffusion and optical-wave equations is presented, which shows an evolution toward a steady state that is independent of the initial optical beam shape. At higher intensities, the numerical solution shows the influence of higher-order nonlinearities, which lead to instability. We define a critical optical intensity, in terms of the particle size, refractive index contrast, and thermal energy, that characterizes the onset of higher-order effects. Instability is found that is consistent with past parametric studies of solitons.

Gordon, R.; Blakely, J. T.; Sinton, D. [Department of Electrical and Computer Engineering, University of Victoria, Victoria, British Columbia, Canada V8P 5C2 (Canada); Department of Mechanical Engineering, University of Victoria, Victoria, British Columbia, Canada V8W 2Y2 (Canada)

2007-05-15T23:59:59.000Z

247

Penning trap mass measurements on nobelium isotopes  

SciTech Connect

The Penning trap mass spectrometer SHIPTRAP at GSI Darmstadt allows accurate mass measurements of radionuclides, produced in fusion-evaporation reactions and separated by the velocity filter SHIP from the primary beam. Recently, the masses of the three nobelium isotopes {sup 252-254}No were determined. These are the first direct mass measurements of transuranium elements, which provide new anchor points in this region. The heavy nuclides were produced in cold-fusion reactions by irradiating a PbS target with a {sup 48}Ca beam, resulting in production rates of the nuclei of interest of about one atom per second. In combination with data from decay spectroscopy our results are used to perform a new atomic-mass evaluation in this region.

Dworschak, M.; Block, M.; Ackermann, D.; Herfurth, F.; Hessberger, F. P.; Hofmann, S.; Vorobyev, G. K. [GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany); Audi, G. [CSNSM-IN2P3-CNRS, F-91405 Orsay-Campus (France); Blaum, K. [Max-Planck-Institut fuer Kernphysik, D-69117 Heidelberg (Germany); Ruprecht-Karls-Universitaet, D-69120 Heidelberg (Germany); Droese, C.; Marx, G.; Schweikhard, L. [Ernst-Moritz-Arndt-Universitaet, Institut fuer Physik, D-17487 Greifswald (Germany); Eliseev, S.; Ketter, J. [Max-Planck-Institut fuer Kernphysik, D-69117 Heidelberg (Germany); Fleckenstein, T. [Justus-Liebig-Universitaet Giessen, D-35390 Giessen (Germany); Haettner, E.; Plass, W. R.; Scheidenberger, C. [GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany); Justus-Liebig-Universitaet Giessen, D-35390 Giessen (Germany); Ketelaer, J. [Johannes Gutenberg-Universitaet, Institut fuer Physik, D-55099 Mainz (Germany); Kluge, H.-J. [GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany); Ruprecht-Karls-Universitaet, D-69120 Heidelberg (Germany)

2010-06-15T23:59:59.000Z

248

Contaminant trap for gas-insulated apparatus  

DOE Patents (OSTI)

A contaminant trap for a gas-insulated electrical conductor is provided. A resinous dielectric body such as Kel-F wax, grease or other sticky polymeric or oligomeric compound is disposed on the inside wall of the outer housing for the conductor. The resinous body is sufficiently sticky at ambient temperatures to immobilize contaminant particles in the insulating gas on the exposed surfaces thereof. An electric resistance heating element is disposed in the resinous body to selectively raise the temperature of the resinous body to a molten state so that the contaminant particles collected on the surface of the body sink into the body so that the surface of the resinous body is renewed to a particle-less condition and, when cooled, returns to a sticky collecting surface.

Adcock, James L. (Knoxville, TN); Pace, Marshall O. (Knoxville, TN); Christophorou, Loucas G. (Oak Ridge, TN)

1984-01-01T23:59:59.000Z

249

Single cell trapping and DNA damage analysis using microwell arrays  

E-Print Network (OSTI)

With a direct link to cancer, aging, and heritable diseases as well as a critical role in cancer treatment, the importance of DNA damage is well-established. The intense interest in DNA damage in applications ranging from ...

Wood, David

250

Electrostatic particle trap for ion beam sputter deposition  

DOE Patents (OSTI)

A method and apparatus for the interception and trapping of or reflection of charged particulate matter generated in ion beam sputter deposition. The apparatus involves an electrostatic particle trap which generates electrostatic fields in the vicinity of the substrate on which target material is being deposited. The electrostatic particle trap consists of an array of electrode surfaces, each maintained at an electrostatic potential, and with their surfaces parallel or perpendicular to the surface of the substrate. The method involves interception and trapping of or reflection of charged particles achieved by generating electrostatic fields in the vicinity of the substrate, and configuring the fields to force the charged particulate material away from the substrate. The electrostatic charged particle trap enables prevention of charged particles from being deposited on the substrate thereby enabling the deposition of extremely low defect density films, such as required for reflective masks of an extreme ultraviolet lithography (EUVL) system.

Vernon, Stephen P. (Pleasanton, CA); Burkhart, Scott C. (Livermore, CA)

2002-01-01T23:59:59.000Z

251

Ion-trap electrode preparation with Ne$^+$ bombardment  

E-Print Network (OSTI)

We describe an ex-situ surface-cleaning procedure that is shown to reduce motional heating from ion-trap electrodes. This precleaning treatment, to be implemented immediately before the final assembly and vacuum processing of ion traps, removes surface contaminants remaining after the electrode-fabrication process. We incorporate a multi-angle ion-bombardment treatment intended to clean the electrode surfaces and interelectrode gaps of microfabricated traps. This procedure helps to minimize redeposition in the gaps between electrodes that can cause electrical shorts. We report heating rates in a stylus-type ion trap prepared in this way that are lower by one order of magnitude compared to a similar untreated stylus-type trap using the same experimental setup.

McKay, K S; Colombe, Y; Jördens, R; Wilson, A C; Slichter, D H; Allcock, D T C; Leibfried, D; Wineland, D J; Pappas, D P

2014-01-01T23:59:59.000Z

252

Ion-trap electrode preparation with Ne$^+$ bombardment  

E-Print Network (OSTI)

We describe an ex-situ surface-cleaning procedure that is shown to reduce motional heating from ion-trap electrodes. This precleaning treatment, to be implemented immediately before the final assembly and vacuum processing of ion traps, removes surface contaminants remaining after the electrode-fabrication process. We incorporate a multi-angle ion-bombardment treatment intended to clean the electrode surfaces and interelectrode gaps of microfabricated traps. This procedure helps to minimize redeposition in the gaps between electrodes that can cause electrical shorts. We report heating rates in a stylus-type ion trap prepared in this way that are lower by one order of magnitude compared to a similar untreated stylus-type trap using the same experimental setup.

K. S. McKay; D. A. Hite; Y. Colombe; R. Jördens; A. C. Wilson; D. H. Slichter; D. T. C. Allcock; D. Leibfried; D. J. Wineland; D. P. Pappas

2014-06-06T23:59:59.000Z

253

Demonstration of a Scalable, Multiplexed Ion Trap for Quantum Information Processing  

E-Print Network (OSTI)

A scalable, multiplexed ion trap for quantum information processing is fabricated and tested. The trap design and fabrication process are optimized for scalability to small trap size and large numbers of interconnected ...

Leibrandt, David R.

254

Measurements of electric field noise and light-induced charging in cryogenic surface electrode ion traps  

E-Print Network (OSTI)

Ion traps provide an excellent tool for controlling and observing the state of a single trapped ion. For this reason, ion traps have been proposed as a possible system for large-scale quantum computation. However, many ...

Lachenmyer, Nathan S. (Nathan Scott)

2010-01-01T23:59:59.000Z

255

Circulating Optical Particle Trapping through the Integration of Fiber Optics and Microfluidics  

Science Journals Connector (OSTI)

A dual-fiber optic trap is integrated with microfluidics, and stable circulatory particle trapping is observed. The unique circulating and flow-dependant nature of the trap enables...

Blakely, J Thomas; Gordon, Reuven; Sinton, David

256

Study of Ion Cooling and Ejection from Two Stage Linear Quadrupole Ion Trap consisted of RFQ ion guides  

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

Ion Cooling and Ejection from Two Stage Linear Quadrupole Ion Trap consisted of RFQ ion guides Ion Cooling and Ejection from Two Stage Linear Quadrupole Ion Trap consisted of RFQ ion guides Kozlovskiy V.I., Filatov V. V., Shchepunov (UNIRIB, O.R.A.U. Oak Ridge, TN, USA) V. A., Brusov V. S., Pikhtelev A. R., Zelenov V. V. Introduction The primary objective of this work concerns linear quadrupole ion traps, which are commonly used to interface a continuous ion beam from an external source with a mass analyzer, requiring bunched or pulsed beams. We assume that the ions prepared for mass analysis, are well spatially shaped, and normalized by ion kinetic energy. (Slava, I don't understand the meaning of the previous sentence - I wrote it as I interpreted what you are saying - I may be all wrong) In our work, such a device was developed and built to interface a source of continuous ion beams and a

257

Advanced quadrupole ion trap instrumentation for low level vehicle emissions measurements. CRADA final report for number ORNL93-0238  

SciTech Connect

Quadrupole ion trap mass spectrometry has been evaluated for its potential use in vehicle emissions measurements in vehicle test facilities as an analyzer for the top 15 compounds contributing to smog generation. A variety of ionization methods were explored including ion trap in situ chemical ionization, atmospheric sampling glow discharge ionization, and nitric oxide chemical ionization in a glow discharge ionization source coupled with anion trap mass spectrometer. Emphasis was placed on the determination of hydrocarbons and oxygenated hydrocarbons at parts per million to parts per billion levels. Ion trap in situ water chemical ionization and atmospheric sampling glow discharge ionization were both shown to be amenable to the analysis of arenes, alcohols, aldehydes and, to some degree, alkenes. Atmospheric sampling glow discharge also generated molecular ions of methyl-t-butyl ether (MTBE). Neither of these ionization methods, however, were found to generate diagnostic ions for the alkanes. Nitric oxide chemical ionization, on the other hand, was found to yield diagnostic ions for alkanes, alkenes, arenes, alcohols, aldehydes, and MTBE. The ability to measure a variety of hydrocarbons present at roughly 15 parts per billion at measurement rates of 3 Hz was demonstrated. These results have demonstrated that the ion trap has an excellent combination of sensitivity, specificity, speed, and flexibility with respect to the technical requirements of the top 15 analyzer.

McLuckey, S.A.; Buchanan, M.V.; Asano, K.G.; Hart, K.J.; Goeringer, D.E. [Oak Ridge National Lab., TN (United States); Dearth, M.A. [Ford Motor Co., Dearborn, MI (United States). Environmental Research Consortium

1997-09-01T23:59:59.000Z

258

Measurement of the Neutron Lifetime by Counting Trapped Protons in a Cold Neutron Beam  

E-Print Network (OSTI)

A measurement of the neutron lifetime $\\tau_{n}$ performed by the absolute counting of in-beam neutrons and their decay protons has been completed. Protons confined in a quasi-Penning trap were accelerated onto a silicon detector held at a high potential and counted with nearly unit efficiency. The neutrons were counted by a device with an efficiency inversely proportional to neutron velocity, which cancels the dwell time of the neutron beam in the trap. The result is $\\tau_{n} = (886.6\\pm1.2{\\rm [stat]}\\pm3.2{\\rm [sys]})$ s, which is the most precise measurement of the lifetime using an in-beam method. The systematic uncertainty is dominated by neutron counting, in particular the mass of the deposit and the $^{6}$Li({\\it{n,t}}) cross section. The measurement technique and apparatus, data analysis, and investigation of systematic uncertainties are discussed in detail.

J. S. Nico; M. S. Dewey; D. M. Gilliam; F. E. Wietfeldt; X. Fei; W. M. Snow; G. L. Greene; J. Pauwels; R. Eykens; A. Lamberty; J. Van Gestel; R. D. Scott

2004-11-19T23:59:59.000Z

259

Properties of Trapped Electron Bunches in a Plasma Wakefield Accelerator  

SciTech Connect

Plasma-based accelerators use the propagation of a drive bunch through plasma to create large electric fields. Recent plasma wakefield accelerator (PWFA) experiments, carried out at the Stanford Linear Accelerator Center (SLAC), successfully doubled the energy for some of the 42 GeV drive bunch electrons in less than a meter; this feat would have required 3 km in the SLAC linac. This dissertation covers one phenomenon associated with the PWFA, electron trapping. Recently it was shown that PWFAs, operated in the nonlinear bubble regime, can trap electrons that are released by ionization inside the plasma wake and accelerate them to high energies. These trapped electrons occupy and can degrade the accelerating portion of the plasma wake, so it is important to understand their origins and how to remove them. Here, the onset of electron trapping is connected to the drive bunch properties. Additionally, the trapped electron bunches are observed with normalized transverse emittance divided by peak current, {epsilon}{sub N,x}/I{sub t}, below the level of 0.2 {micro}m/kA. A theoretical model of the trapped electron emittance, developed here, indicates that the emittance scales inversely with the square root of the plasma density in the non-linear 'bubble' regime of the PWFA. This model and simulations indicate that the observed values of {epsilon}{sub N,x}/I{sub t} result from multi-GeV trapped electron bunches with emittances of a few {micro}m and multi-kA peak currents. These properties make the trapped electrons a possible particle source for next generation light sources. This dissertation is organized as follows. The first chapter is an overview of the PWFA, which includes a review of the accelerating and focusing fields and a survey of the remaining issues for a plasma-based particle collider. Then, the second chapter examines the physics of electron trapping in the PWFA. The third chapter uses theory and simulations to analyze the properties of the trapped electron bunches. Chapters four and five present the experimental diagnostics and measurements for the trapped electrons. Next, the sixth chapter introduces suggestions for future trapped electron experiments. Then, Chapter seven contains the conclusions. In addition, there is an appendix chapter that covers a topic which is extraneous to electron trapping, but relevant to the PWFA. This chapter explores the feasibility of one idea for the production of a hollow channel plasma, which if produced could solve some of the remaining issues for a plasma-based collider.

Kirby, Neil; /SLAC

2009-10-30T23:59:59.000Z

260

Advanced Light-Trapping in Thin-Film Silicon Solar Cells  

Science Journals Connector (OSTI)

Light-trapping schemes are essential for high efficiency thin-film Silicon devices. Implementation of various light-trapping/scattering elements will be discussed. An optimum textured...

Wyrsch, Nicolas

Note: This page contains sample records for the topic "trap trace analysis" 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.


261

Trapping and cooling He(2{sup 3}S) metastable atoms  

SciTech Connect

A magneto-optical trap for He(2{sup 3}S) metastable atoms has been constructed, utilizing superconducting magnetic gradient coils and a Ti:Sapphire ring laser for pumping the helium 2{sup 3}S-2{sup 3}P transition. The He(2{sup 3}S) atoms are produced by a weak rf discharge in helium gas at a temperature of 1.4K. The discharge products flow through a small orifice into the trap cell, where a fraction of the He(2{sup 3}S) atoms are trapped and ground state helium atoms are rapidly cryopumped by zeolite pellets that cover most of the cell bottom. Preliminary experiments suggest that {approximately}10{sup 6} atoms are trapped in a small volume at {approximately}1 mK, with a trap lifetime of 10-100 msec limited by resonantly-enhanced He(2{sup 3}S)-He(2{sup 3}P) Penning reactions. Ultimately, it is estimated that a substantial number of atoms can be held at ultra-low temperature in near-perfect vacuum, in a dc magnetic trap. Measurements of decay times of the trapped atoms should yield rate coefficients in the quantum regime for He(2{sup 3}S)-He(2{sup 3}P) and He(2{sup 3}S)-He(2{sup 3}S) Penning reactions, and perhaps the He(2{sup 3}S) radiative lifetime.

Zhao, X.; Soletsky, P.A.; Bryan, W.H.; Ling, X. [and others

1993-05-01T23:59:59.000Z

262

Using malaise traps to sample ground beetles (Coleoptera: Carabidae).  

SciTech Connect

Pitfall traps provide an easy and inexpensive way to sample ground-dwelling arthropods (Spence and Niemela 1994; Spence et al. 1997; Abildsnes and Tommeras 2000) and have been used exclusively in many studies of the abundance and diversity of ground beetles (Coleoptera: Carabidae). Despite the popularity of this trapping technique, pitfall traps have many disadvantages. For example, they often fail to collect both small (Spence and Niemela 1994) and �¢����trap-shy�¢��� species (Benest 1989), eventually deplete the local carabid population (Digweed et al. 1995), require a species to be ground-dwelling in order to be captured (Liebherr and Mahar 1979), and produce different results depending on trap diameter and material, type of preservative used, and trap placement (Greenslade 1964; Luff 1975; Work et al. 2002). Further complications arise from seasonal patterns of movement among the beetles themselves (Maelfait and Desender 1990), as well as numerous climatic factors, differences in plant cover, and variable surface conditions (Adis 1979). Because of these limitations, pitfall trap data give an incomplete picture of the carabid community and should be interpreted carefully. Additional methods, such as use of Berlese funnels and litter washing (Spence and Niemela 1994), collection from lights (Usis and MacLean 1998), and deployment of flight intercept devices (Liebherr and Mahar 1979; Paarmann and Stork 1987), should be incorporated in surveys to better ascertain the species composition and relative numbers of ground beetles. Flight intercept devices, like pitfall traps, have the advantage of being easy to use and replicate, but their value to carabid surveys is largely unknown. Here we demonstrate the effectiveness of Malaise traps for sampling ground beetles in a bottomland hardwood forest.

Ulyshen, Michael D., James L. Hanula, and Scott Horn

2005-01-01T23:59:59.000Z

263

Vascular flora and gradient analysis of the Natchez Trace Parkway  

E-Print Network (OSTI)

....................................................................... 122 Jackson Falls............................................................................... 122 Beaver Pond................................................................................ 123 Rock Springs... Photo of possible endangered species taken on August 2004 collection trip .... 108 4 Jackson Falls located in Hickman County, TN ................................................... 123 5 Beaver Pond located in Wayne County, TN...

Phillips, Nena Mae Monique

2009-06-02T23:59:59.000Z

264

Trace-driven analysis of data forwarding in opportunistic networks  

E-Print Network (OSTI)

. Our methods draw on graph-expansion techniques and circumvent the need for more custom simulation flooding and socioaware protocol variants. We outline the general approach and exemplify and circumvent the need for more custom simulation software packages. They address a wide range of opportunistic

Stavrakakis, Ioannis

265

Securing Mediated Trace Access Using Black-box Permutation Analysis  

E-Print Network (OSTI)

in a surreptitious fashion in the output. Conceptually, the provider can detect this leakage as follows. They first

Sommer, Robin

266

Nuclear Fusion for Bose Nuclei Confined in Ion Traps  

SciTech Connect

Nuclear fusion of integer spin nuclei confined in an isotropic ion trap is investigated. Solutions of the ground state for charged bosons trapped in the isotropic harmonic oscillator potential are calculated using the equivalent linear two-body method for many-body problems, which is based on an approximate reduction of the many-body Schroedinger equation by the use of a variational principle. Using the ground-state wave function, theoretical estimates of probabilities and rates for nuclear fusion for Bose nuclei confined in ion traps are obtained. Numerical estimates for fusion rates are presented for the case of deuteron-deuteron fusion.

Kim, Yeong E.; Zubarev, Alexander L. [Purdue University (United States)

2000-03-15T23:59:59.000Z

267

Population trapping in Kr and Xe in intense laser fields  

Science Journals Connector (OSTI)

We have observed trapping of population in Rydberg states of atoms and ions exposed to intense laser radiation. The trapping occurs in nonstationary ‘‘wave-packet’’ superposition states, created, via ac Stark-shifted multiphoton resonances during the laser pulse. The formation of these highly excited bound states requires the nonresonant absorption of up to 20 or more photons; some of the ionic Rydberg states lie nearly 32 eV above the ionic ground state. All of the trapped states having binding energies much less than the photon energy but remain stable against ionization even when the multiphoton ionization probability of the atom is saturated.

R. R. Jones; D. W. Schumacher; P. H. Bucksbaum

1993-01-01T23:59:59.000Z

268

Laser trapping of short-lived radioactive isotopes  

Science Journals Connector (OSTI)

We describe an experiment which demonstrates the feasibility of trapping significant quantities of short-lived radioactive atoms with laser light. A thermal beam of 22.5 sec half-life Na21 atoms was produced on-line at the LBL 88’’ Cyclotron. After decelerating the beam using a Zeeman-tuned slowing technique we stored about 4×103 Na21 atoms in a magneto-optical trap. The number of trapped atoms is large enough to be used in experimental studies of the beta decay of Na21. The basic method can be adapted for other rare isotopes.

Z-T. Lu; C. Bowers; S. J. Freedman; B. K. Fujikawa; J. L. Mortara; S-Q. Shang; K. P. Coulter; L. Young

1994-06-13T23:59:59.000Z

269

Trap seal for open circuit liquid cooled turbines  

DOE Patents (OSTI)

An improved trap seal for open circuit liquid cooled turbines is disclosed. The trap seal of the present invention includes an annular recess formed in the supply conduit of cooling channels formed in the airfoil of the turbine buckets. A cylindrical insert is located in the annular recesses and has a plurality of axial grooves formed along the outer periphery thereof and a central recess formed in one end thereof. The axial grooves and central recess formed in the cylindrical insert cooperate with the annular recess to define a plurality of S-shaped trap seals which permit the passage of liquid coolant but prohibit passage of gaseous coolant.

Grondahl, Clayton M. (Clifton Park, NY); Germain, Malcolm R. (Ballston Lake, NY)

1980-01-01T23:59:59.000Z

270

Trapped Ion Quantum Error Correcting Protocols Using Only Global Operations  

E-Print Network (OSTI)

Quantum error-correcting codes are many-body entangled states that are prepared and measured using complex sequences of entangling operations. Each element of such an entangling sequence introduces noise to delicate quantum information during the encoding or reading out of the code. It is important therefore to find efficient entangling protocols to avoid the loss of information. Here we propose an experiment that uses only global entangling operations to encode an arbitrary logical qubit to either the five-qubit repetition code or the five-qubit code, with a six-ion Coulomb crystal architecture in a Penning trap. We show that the use of global operations enables us to prepare and read out these codes using only six and ten global entangling pulses, respectively. The proposed experiment also allows the acquisition of syndrome information during readout. We provide a noise analysis for the presented protocols, estimating that we can achieve a six-fold improvement in coherence time with noise as high as $\\sim 1\\%$ on each entangling operation.

Joseph F. Goodwin; Benjamin J. Brown; Graham Stutter; Howard Dale; Richard C. Thompson; Terry Rudolph

2014-07-07T23:59:59.000Z

271

The Effects of Trace Contaminants on Catalytic Processing of...  

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

Processing of Biomass-Derived Feedstocks . Abstract: Trace components in biomass feedstocks are potential catalyst poisons when catalytically processing these materials to...

272

Towards a Ubiquitous Semantics of Interaction: phenomenology, scenarios and traces  

E-Print Network (OSTI)

Towards a Ubiquitous Semantics of Interaction: phenomenology, scenarios and traces Alan Dix does not attempt to address the whole question, but focuses on a phenomenological semantics

Dix, Alan

273

IJS procedure for RELAP5 to TRACE input model conversion using SNAP  

SciTech Connect

The TRAC/RELAP Advanced Computational Engine (TRACE) advanced, best-estimate reactor systems code developed by the U.S. Nuclear Regulatory Commission comes with a graphical user interface called Symbolic Nuclear Analysis Package (SNAP). Much of efforts have been done in the past to develop the RELAP5 input decks. The purpose of this study is to demonstrate the Institut 'Josef Stefan' (IJS) conversion procedure from RELAP5 to TRACE input model of BETHSY facility. The IJS conversion procedure consists of eleven steps and is based on the use of SNAP. For calculations of the selected BETHSY 6.2TC test the RELAP5/MOD3.3 Patch 4 and TRACE V5.0 Patch 1 were used. The selected BETHSY 6.2TC test was 15.24 cm equivalent diameter horizontal cold leg break in the reference pressurized water reactor without high pressure and low pressure safety injection. The application of the IJS procedure for conversion of BETHSY input model showed that it is important to perform the steps in proper sequence. The overall calculated results obtained with TRACE using the converted RELAP5 model were close to experimental data and comparable to RELAP5/MOD3.3 calculations. Therefore it can be concluded, that proposed IJS conversion procedure was successfully demonstrated on the BETHSY integral test facility input model. (authors)

Prosek, A.; Berar, O. A. [Josef Stefan Inst., Jamova cesta 39, SI-1000 Ljubljana (Slovenia)

2012-07-01T23:59:59.000Z

274

Purple traps yield Reservation's first detection of Emerald Ash Borer  

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

traps yield Reservation's first detection of Emerald Ash Borer traps yield Reservation's first detection of Emerald Ash Borer The question of whether or not DOE's forests are infested with Emerald Ash Borer (EAB) has been answered. On May 10, a trap on Highway 95 at the Highway 58 interchange produced the first instance of the destructive non-native insect in Roane County. Five days later, a second trap on Bethel Valley Road near the East Portal turned up the first capture in Anderson County. "Unfortunately, these finds signal the beginning of a decline of ash species throughout the reservation" according to Greg Byrd, forester with the ORNL Natural Resources Program. "Dieback will become more prominent as the insect populations expand. Native ash trees have little defense against this pest, which was

275

Laser ablation loading of a surface-electrode ion trap  

E-Print Network (OSTI)

We demonstrate loading by laser ablation of $^{88}$Sr$^+$ ions into a mm-scale surface-electrode ion trap. The laser used for ablation is a pulsed, frequency-tripled Nd:YAG with pulse energies of 1-10 mJ and durations of 3-5 ns. An additional laser is not required to photoionize the ablated material. The efficiency and lifetime of several candidate materials for the laser ablation target are characterized by measuring the trapped ion fluorescence signal for a number of consecutive loads. Additionally, laser ablation is used to load traps with a trap depth (40 meV) below where electron impact ionization loading is typically successful ($\\gtrsim$ 500 meV).

David R. Leibrandt; Robert J. Clark; Jaroslaw Labaziewicz; Paul Antohi; Waseem Bakr; Kenneth R. Brown; Isaac L. Chuang

2007-06-22T23:59:59.000Z

276

Electron source for a mini ion trap mass spectrometer  

DOE Patents (OSTI)

An ion trap is described which operates in the regime between research ion traps which can detect ions with a mass resolution of better than 1:10{sup 9} and commercial mass spectrometers requiring 10{sup 4} ions with resolutions of a few hundred. The power consumption is kept to a minimum by the use of permanent magnets and a novel electron gun design. By Fourier analyzing the ion cyclotron resonance signals induced in the trap electrodes, a complete mass spectra in a single combined structure can be detected. An attribute of the ion trap mass spectrometer is that overall system size is drastically reduced due to combining a unique electron source and mass analyzer/detector in a single device. This enables portable low power mass spectrometers for the detection of environmental pollutants or illicit substances, as well as sensors for on board diagnostics to monitor engine performance or for active feedback in any process involving exhausting waste products. 10 figs.

Dietrich, D.D.; Keville, R.F.

1995-12-19T23:59:59.000Z

277

Electron source for a mini ion trap mass spectrometer  

DOE Patents (OSTI)

An ion trap which operates in the regime between research ion traps which can detect ions with a mass resolution of better than 1:10.sup.9 and commercial mass spectrometers requiring 10.sup.4 ions with resolutions of a few hundred. The power consumption is kept to a minimum by the use of permanent magnets and a novel electron gun design. By Fourier analyzing the ion cyclotron resonance signals induced in the trap electrodes, a complete mass spectra in a single combined structure can be detected. An attribute of the ion trap mass spectrometer is that overall system size is drastically reduced due to combining a unique electron source and mass analyzer/detector in a single device. This enables portable low power mass spectrometers for the detection of environmental pollutants or illicit substances, as well as sensors for on board diagnostics to monitor engine performance or for active feedback in any process involving exhausting waste products.

Dietrich, Daniel D. (Livermore, CA); Keville, Robert F. (Valley Springs, CA)

1995-01-01T23:59:59.000Z

278

Neutron lifetime measurements using gravitationally trapped ultracold neutrons  

E-Print Network (OSTI)

Our experiment using gravitationally trapped ultracold neutrons (UCN) to measure the neutron lifetime is reviewed. Ultracold neutrons were trapped in a material bottle covered with perfluoropolyether. The neutron lifetime was deduced from comparison of UCN losses in the traps with different surface-to-volume ratios. The precise value of the neutron lifetime is of fundamental importance to particle physics and cosmology. In this experiment, the UCN storage time is brought closer to the neutron lifetime than in any experiments before:the probability of UCN losses from the trap was only 1% of that for neutron beta decay. The neutron lifetime obtained,878.5+/-0.7stat+/-0.3sys s, is the most accurate experimental measurement to date.

A. P. Serebrov; V. E. Varlamov; A. G. Kharitonov; A. K. Fomin; Yu. N. Pokotilovski; P. Geltenbort; I. A. Krasnoschekova; M. S. Lasakov; R. R. Taldaev; A. V. Vassiljev; O. M. Zherebtsov

2007-02-06T23:59:59.000Z

279

Neutron lifetime measurements using gravitationally trapped ultracold neutrons  

SciTech Connect

Our experiment using gravitationally trapped ultracold neutrons (UCN) to measure the neutron lifetime is reviewed. Ultracold neutrons were trapped in a material bottle covered with perfluoropolyether. The neutron lifetime was deduced from comparison of UCN losses in the traps with different surface-to-volume ratios. The precise value of the neutron lifetime is of fundamental importance to particle physics and cosmology. In this experiment, the UCN storage time is brought closer to the neutron lifetime than in any experiments before: the probability of UCN losses from the trap was only 1% of that for neutron {beta} decay. The neutron lifetime obtained, 878.5{+-}0.7{sub stat}{+-}0.3{sub sys} s, is the most accurate experimental measurement to date.

Serebrov, A. P.; Varlamov, V. E.; Kharitonov, A. G.; Fomin, A. K.; Krasnoschekova, I. A.; Lasakov, M. S.; Taldaev, R. R.; Vassiljev, A. V.; Zherebtsov, O. M. [Petersburg Nuclear Physics Institute, Russian Academy of Sciences, RU-188300 Gatchina, Leningrad District (Russian Federation); Pokotilovski, Yu. N. [Joint Institute for Nuclear Research, RU-141980 Dubna, Moscow Region (Russian Federation); Geltenbort, P. [Institut Max von Laue Paul Langevin, Boite Postal 156, F-38042 Grenoble Cedex 9 (France)

2008-09-15T23:59:59.000Z

280

A bosonic Josephson junction controlled by a single trapped ion  

E-Print Network (OSTI)

We theoretically investigate the properties of a double-well bosonic Josephson junction coupled to a single trapped ion. We find that the coupling between the wells can be controlled by the internal state of the ion, which can be used for studying mesoscopic entanglement between the two systems and to measure their interaction with high precision. As a particular example we consider a small $^{87}$Rb Bose-Einstein condensate controlled by a single $^{171}$Yb$^+$ ion. We calculate interwell coupling rates reaching 100 Hz, while the state dependence amounts to 10s of Hz for plausible values of the currently unknown s-wave scattering length between the atom and the ion. The system could be realized in an experiment by combining trapped ions with optical dipole traps for cold atoms or in a combined atom-ion micro trap, where both approaches are within reach using current technology.

Gerritsma, R; Doerk, H; Idziaszek, Z; Calarco, T; Schmidt-Kaler, F

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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.


281

Mass Spectrometer: Linear Ion Trap Quadrupole (LTQ) Orbitrap...  

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

Ion Trap Quadrupole (LTQ) Orbitrap MS - for environmental research (nanoDESI) Instrument ID: 34068 Availability: 10 hours a day, 5 days a week Quick Specs Science Contact Science...

282

Quantum gates, sensors, and systems with trapped ions  

E-Print Network (OSTI)

Quantum information science promises a host of new and useful applications in communication, simulation, and computational algorithms. Trapped atomic ions are one of the leading physical systems with potential to implement ...

Wang, Shannon Xuanyue

2012-01-01T23:59:59.000Z

283

Pt-free, Perovskite-based Lean NOx Trap Catalysts  

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

Conference Pt-free, Perovskite-based Lean NO x Trap Catalysts Gongshin Qi, Chang H. Kim, and Wei Li GM Global Research & Development 2010 DEER Conference Overview LNT Chemistry...

284

On the generation of bottom-trapped internal tides  

Science Journals Connector (OSTI)

The interaction of the barotropic tide with the bottom topography when the tidal frequency ? is smaller than the Coriolis frequency f is examined. The resulting waves are called bottom-trapped internal tides. The energy density associated with ...

Saeed Falahat; Jonas Nycander

285

A variational calculation of the trapping rate in thermal barriers  

Science Journals Connector (OSTI)

A variational calculation of the trapping rate and trapped-ion density in thermal barriers is presented. The effects of diffusion in energy as well as pitch-angle scattering are retained. The variational formulation uses the actual trapped/passing boundary in velocity space. The boundary condition is that the trapped-ion distribution function match the passing-ion distribution function, which is taken to be a Maxwellian, on the boundary. The results compare well with the two-dimensional Fokker-Planck code calculations by Futch and LoDestro. The CPU time for a variational calculation is less than 0.1 s using the CRAY-I computer, while a typical Fokker-Planck code calculation takes 10–20 min.

X.Z. Li; G.A. Emmert

1984-01-01T23:59:59.000Z

286

Brief Communication 1195 A gene trap approach in Xenopus  

E-Print Network (OSTI)

developed several gene trap vectors, using the green fluorescent protein (GFP) as a marker. Using, including expression in the epiphysis, the olfactory bulb and placodes, the eyes, ear, brain, muscles, tail

Amaya, Enrique

287

Quantum state engineering in ion-traps via adiabatic passage  

Science Journals Connector (OSTI)

We propose two relatively robust schemes to generate entangled W states of three (or generally N) ions in ion trap systems by using adiabatic passage technique and appropriately designed ion-field couplings in a ...

M. Amniat-Talab; M. Saadati-Niari; S. Guérin

2012-08-01T23:59:59.000Z

288

Light trapping limits in plasmonic solar cells: an analytical investigation  

E-Print Network (OSTI)

We analytically investigate the light trapping performance in plasmonic solar cells with Si/metallic structures. We consider absorption enhancements for surface plasmon polaritons (SPPs) at planar Si/metal interfaces and ...

Sheng, Xing

289

Wednesday, January 30, 2013 Infrared Trapping the "Greenhouse Effect"  

E-Print Network (OSTI)

Wednesday, January 30, 2013 Infrared Trapping ­ the "Greenhouse Effect" Goals ­ to look is the same as a 1.8 degree F change. #12;Last time - Greenhouse effect demo Selective absorption. Greenhouse

Toohey, Darin W.

290

Novel trapping techniques for shaping Bose-Einstein condensates  

E-Print Network (OSTI)

A combination of radio frequency radiation and magnetic field gradients was used to trap atoms in dressed states. In a magnetic field with a quadrupole minimum. RF fields resonant with the (I F. m)) 11. -1) -- 1, 0) ...

Boyd, Micah (Micah Scott)

2007-01-01T23:59:59.000Z

291

Light Trapping, Absorption and Solar Energy Harvesting by Artificial Materials  

SciTech Connect

We provide designs of thin-film solar cells utilizing optimized photonic-crystal light-trapping and numerical simulations of their solar-to-electrical power conversion efficiencies.

John, Sajeev [University of Toronto

2014-08-15T23:59:59.000Z

292

A Technical Review of Penning Trap based Investigations in Neutron Decay  

E-Print Network (OSTI)

This review is concerned with a detailed analysis of some of the technical problems which arise in the application of the Penning trap method to the experimental study of neutron $\\beta $ -decay,a technique which was first successfully tested on the low-flux swimming-pool reactor LIDO (capture flux =3$\\cdot 10^6$cm$^(-2)$s$^(-1)$) at AERE Harwell in the 1970's. It does not discuss the scientific merits or demerits of these studies. Of particular importance are the trapping and release of neutron decay protons, and the influence of magnetic mirror effects and radial drifting on the trapped particles. Since these have energies < 1 keV they must be accelerated to energies of order 20-30 keV following release, at which point they are recorded in a silicon surface barrier detector. However serious difficulties were encountered in the post-release acceleration process with vacuum breakdown in the presence of crossed electric and magnetic fields.

Byrne, J

2014-01-01T23:59:59.000Z

293

A Technical Review of Penning Trap based Investigations in Neutron Decay  

E-Print Network (OSTI)

This review is concerned with a detailed analysis of some of the technical problems which arise in the application of the Penning trap method to the experimental study of neutron $\\beta $ -decay,a technique which was first successfully tested on the low-flux swimming-pool reactor LIDO (capture flux =3$\\cdot 10^6$cm$^(-2)$s$^(-1)$) at AERE Harwell in the 1970's. It does not discuss the scientific merits or demerits of these studies. Of particular importance are the trapping and release of neutron decay protons, and the influence of magnetic mirror effects and radial drifting on the trapped particles. Since these have energies < 1 keV they must be accelerated to energies of order 20-30 keV following release, at which point they are recorded in a silicon surface barrier detector. However serious difficulties were encountered in the post-release acceleration process with vacuum breakdown in the presence of crossed electric and magnetic fields.

J. Byrne

2014-07-11T23:59:59.000Z

294

Laser induced rotation of trapped chiral and achiral nematic droplets  

E-Print Network (OSTI)

We study the response of optically trapped achiral and chiralised nematic liquid crystal droplets to linear as well as circular polarised light. We find that there is internal dissipation in rotating achiral nematic droplets trapped in glycerine. We also demonstrate that some chiralised droplets rotate under linearly polarised light. The best fit to our data on chiralised droplets indicates that rotational frequency of these droplets with radius R is approximately proportional to1/R^2, rather than to 1/R^3.

Marjan Mosallaeipour; Yashodhan Hatwalne; N. V. Madhusudana; Sharath Ananthamurthy

2010-02-05T23:59:59.000Z

295

Trapped surfaces in Oppenheimer-Snyder black holes  

E-Print Network (OSTI)

The Oppenheimer-Snyder solution models a homogeneous round dust cloud collapsing to a black hole. Inside its event horizon there is a region through which trapped surfaces pass. We try to determine exactly where the boundary of this region meets the centre of the cloud. We present explicit examples of the relevant trapped (topological) spheres; they extend into the exterior vacuum region, and are carefully matched at the junction between the cloud and the vacuum.

Ingemar Bengtsson; Emma Jakobsson; José M. M. Senovilla

2013-06-27T23:59:59.000Z

296

The Engineered Approach to Energy and Maintenance Effective Steam Trapping  

E-Print Network (OSTI)

., Chemical Engineering 9/1/75. 4. Maintenance Engineering, May 1976. 5. "How Much Does Lost Steam Cost",Armstrong Machine works, Hydrocarbon Processing, p.129, Jan. 1976. 6. "Setter Steam Trapping Cuts Energy Waste", wesley Yates, Yarway Corp..., Georgia Tech Industrial Energy Extension Service, Chemical Engineering, 2/11/80. 10. ''Basic Facts & Enerqv Saving Tips" ,Lawrence R. O'Dell, Armstrong Machine Works, Heating/Piping/ Air Conditioning, May 1977. 11. Steam Trap Report - Energy Loss...

Krueger, R. G.; Wilt, G. W.

1980-01-01T23:59:59.000Z

297

Master equation approach to protein folding and kinetic traps  

E-Print Network (OSTI)

The master equation for 12-monomer lattice heteropolymers is solved numerically and the time evolution of the occupancy of the native state is determined. At low temperatures, the median folding time follows the Arrhenius law and is governed by the longest relaxation time. For good folders, significant kinetic traps appear in the folding funnel whereas for bad folders, the traps also occur in non-native energy valleys.

Marek Cieplak; Malte Henkel; Jan Karbowski; Jayanth R. Banavar

1998-04-21T23:59:59.000Z

298

Design and operation of the electron beam ion trap  

SciTech Connect

This report describes the basic features and operating principles of the Electron Beam Ion Trap. The differences between EBIT and other sources of highly charged ions are outlined. Its features and operating parameters are discussed. The report also explains why certain design choices were necessary and the constraints involved in building an electron beam ion trap. EBIT's evaporation cooling system is described in detail. 13 refs., 8 figs.

Vogel, D.

1990-05-30T23:59:59.000Z

299

Magnetic line trapping and effective transport in stochastic magnetic fields  

Science Journals Connector (OSTI)

The transport of collisional particles in stochastic magnetic fields is studied using the decorrelation trajectory method. The nonlinear effect of magnetic line trapping is considered together with particle collisions. The running diffusion coefficient is determined for arbitrary values of the statistical parameters of the stochastic magnetic field and of the collisional velocity. The effect of the magnetic line trapping is determined. New anomalous diffusion regimes are found.

M. Vlad; F. Spineanu; J. H. Misguich; R. Balescu

2003-02-07T23:59:59.000Z

300

Tracing The Largest Seasonal Migration on Earth  

E-Print Network (OSTI)

It is estimated that over 3.6 billion passengers are travelling during the Chinese Spring Festival travel season. They leave their working cities and return their hometowns to enjoy annual family time, and back to cities after the holiday. In this study, with the massive location-based data collected from millions of smartphone users, we propose a novel method to trace the migration flow and explore the migration patterns of Chinese people. From the temporal perspective, we explore the migration trend over time during a 34-days period, about half a month before and after the Spring Festival. From the spatial perspective, the migration directions and routes are estimated and quantified, and the migration flow is visualized. The spatial range of influence of developed regions could be reflected with the destinations of migration, the migration destinations and originations have obvious characteristic of geographical proximity.

Wang, Xianwen; Mao, Wenli; Hu, Zhigang; Gu, Li

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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.


301

Electron cyclotron resonance near the axis of the gas-dynamic trap  

SciTech Connect

Propagation of an extraordinary electromagnetic wave in the vicinity of electron cyclotron resonance surface in an open linear trap is studied analytically, taking into account inhomogeneity of the magnetic field in paraxial approximation. Ray trajectories are derived from a reduced dispersion equation that makes it possible to avoid the difficulty associated with a transition from large propagation angles to the case of strictly longitudinal propagation. Our approach is based on the theory, originally developed by Zvonkov and Timofeev [Sov. J. Plasma Phys. 14, 743 (1988)], who used the paraxial approximation for the magnetic field strength, but did not consider the slope of the magnetic field lines, which led to considerable error, as has been recently noted by Gospodchikov and Smolyakova [Plasma Phys. Rep. 37, 768-774 (2011)]. We have found ray trajectories in analytic form and demonstrated that the inhomogeneity of both the magnetic field strength and the field direction can qualitatively change the picture of wave propagation and significantly affect the efficiency of electron cyclotron heating of a plasma in a linear magnetic trap. Analysis of the ray trajectories has revealed a criterion for the resonance point on the axis of the trap to be an attractor for the ray trajectories. It is also shown that a family of ray trajectories can still reach the resonance point on the axis if the latter generally repels the ray trajectories. As an example, results of general theory are applied to the electron cyclotron resonance heating experiment which is under preparation on the gas dynamic trap in the Budker Institute of Nuclear Physics [Shalashov et al., Phys. Plasmas 19, 052503 (2012)].

Bagulov, D. S. [Novosibirsk State University, Pirogova Street 2, Novosibirsk (Russian Federation); Kotelnikov, I. A. [Novosibirsk State University, Pirogova Street 2, Novosibirsk (Russian Federation); Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences, Akademika Lavrentyeva Prospect 11, 630090 Novosibirsk (Russian Federation)

2012-08-15T23:59:59.000Z

302

Measuring the Neutron Lifetime Using Magnetically Trapped Neutrons  

E-Print Network (OSTI)

The neutron beta-decay lifetime plays an important role both in understanding weak interactions within the framework of the Standard Model and in theoretical predictions of the primordial abundance of 4He in Big Bang Nucleosynthesis. In previous work, we successfully demonstrated the trapping of ultracold neutrons (UCN) in a conservative potential magnetic trap. A major upgrade of the apparatus is nearing completion at the National Institute of Standards and Technology Center for Neutron Research (NCNR). In our approach, a beam of 0.89 nm neutrons is incident on a superfluid 4He target within the minimum field region of an Ioffe-type magnetic trap. A fraction of the neutrons is downscattered in the helium to energies <200 neV, and those in the appropriate spin state become trapped. The inverse process is suppressed by the low phonon density of helium at temperatures less than 200 mK, allowing the neutron to travel undisturbed. When the neutron decays the energetic electron ionizes the helium, producing scintillation light that is detected using photomultiplier tubes. Statistical limitations of the previous apparatus will be alleviated by significant increases in field strength and trap volume resulting in twenty times more trapped neutrons.

C. M. O'Shaughnessy; R. Golub; K. W. Schelhammer; C. M. Swank; P. -N. Seo; P. R. Huffman; S. N. Dzhosyuk; C. E. H. Mattoni; L. Yang; J. M. Doyle; K. J. Coakley; A. K. Thompson; H. P. Mumm; S. K. Lamoreaux; G. Yang

2009-03-31T23:59:59.000Z

303

Insect Trace Fossil Associations in Paleosols: The Coprinisphaera Ichnofacies  

Science Journals Connector (OSTI)

...Namibia Sossus Sand (Khommabes Car-bonates) Late Pleistocene...from the Pleistocene Khommabes Car-bonates of Namibia are not...1993, Trace fossils from a Car-boniferous turbiditic lake...1985, Trace fossils from the Panther Member, Star Point Formation...

JORGE F. GENISE; M. GABRIELA MáNGANO; LUIS A. BUATOIS; JOSÉ H. LAZA; MARIANO VERDE

304

Evaluating regional emission estimates using the TRACE-P observations  

E-Print Network (OSTI)

Evaluating regional emission estimates using the TRACE-P observations G. R. Carmichael,1 Y. Tang,1. Wang,6 D. R. Blake,7 E. Atlas,8 A. Fried,8 B. Potter,9 M. A. Avery,10 G. W. Sachse,10 S. T. Sandholm,11 the NASA Transport and Chemical Evolution over the Pacific (TRACE-P) experiment are used in conjunction

Clarke, Antony

305

Looking For Traces of Pharmaceuticals in Drinking Water  

E-Print Network (OSTI)

Looking For Traces of Pharmaceuticals in Drinking Water By Daniel D. Snow, Ph.D. Director traces of drugs in the public drinking water supplies of 24 major U.S. metropolitan areas. This has in drinking water supplies is not new, but the classes of contaminants being tested for are. Pharmaceuticals

Nebraska-Lincoln, University of

306

System and method for trapping and measuring a charged particle in a liquid  

DOE Patents (OSTI)

A system and method for trapping a charged particle is disclosed. A time-varying periodic multipole electric potential is generated in a trapping volume. A charged particle under the influence of the multipole electric field is confined to the trapping volume. A three electrode configuration giving rise to a 3D Paul trap and a four planar electrode configuration giving rise to a 2D Paul trap are disclosed.

Reed, Mark A; Krstic, Predrag S; Guan, Weihua; Zhao, Xiongce

2013-07-23T23:59:59.000Z

307

An investigation of the sub-grid variability of trace gases and aerosols for global climate modeling  

SciTech Connect

One fundamental property and limitation of grid based models is their inability to identify spatial details smaller than the grid cell size. While decades of work have gone into developing sub-grid treatments for clouds and land surface processes in climate models, the quantitative understanding of sub-grid processes and variability for aerosols and their precursors is much poorer. In this study, WRF-Chem is used to simulate the trace gases and aerosols over central Mexico during the 2006 MILAGRO field campaign, with multiple spatial resolutions and emission/terrain scenarios. Our analysis focuses on quantifying the sub-grid variability (SGV) of trace gases and aerosols within a typical global climate model grid cell, i.e. 75x75 km2. Our results suggest that a simulation with 3-km horizontal grid spacing adequately reproduces the overall transport and mixing of trace gases and aerosols downwind of Mexico City, while 75-km horizontal grid spacing is insufficient to represent local emission and terrain-induced flows along the mountain ridge, subsequently affecting the transport and mixing of plumes from nearby sources. Therefore, the coarse model grid cell average may not correctly represent aerosol properties measured over polluted areas. Probability density functions (PDFs) for trace gases and aerosols show that secondary trace gases and aerosols, such as O3, sulfate, ammonium, and nitrate, are more likely to have a relatively uniform probability distribution (i.e. smaller SGV) over a narrow range of concentration values. Mostly inert and long-lived trace gases and aerosols, such as CO and BC, are more likely to have broad and skewed distributions (i.e. larger SGV) over polluted regions. Over remote areas, all trace gases and aerosols are more uniformly distributed compared to polluted areas. Both CO and O3 SGV vertical profiles are nearly constant within the PBL during daytime, indicating that trace gases are very efficiently transported and mixed vertically by turbulence. But, simulated horizontal variability indicates that trace gases and aerosols are not well mixed horizontally in the PBL. During nighttime the SGV for trace gases is maximum at the surface, and quickly decreases with height. Unlike the trace gases, the SGV of BC and secondary aerosols reaches a maximum at the PBL top during the day. The SGV decreases with distance away from the polluted urban area, has a more rapid decrease for long-lived trace gases and aerosols than for secondary ones, and is greater during daytime than nighttime. The SGV of trace gases and aerosols is generally larger than for meteorological quantities. Emissions can account for up to 50% of the SGV over urban areas such as Mexico City during daytime for less-reactive trace gases and aerosols, such as CO and BC. The impact of emission spatial variability on SGV decays with altitude in the PBL and is insignificant in the free troposphere. The emission variability affects SGV more significantly during daytime (rather than nighttime) and over urban (rather than rural or remote) areas. The terrain, through its impact on meteorological fields such as wind and the PBL structure, affects dispersion and transport of trace gases and aerosols and their SGV.

Qian, Yun; Gustafson, William I.; Fast, Jerome D.

2010-07-29T23:59:59.000Z

308

Investigation on thermal and trace element characteristics during co-combustion biomass with coal gangue  

Science Journals Connector (OSTI)

Abstract The thermochemical behaviors during co-combustion of coal gangue (CG), soybean stalk (SS), sawdust (SD) and their blends prepared at different ratios have been determined via thermogravimetric analysis. The simulate experiments in a fixed bed reactor were performed to investigate the partition behaviors of trace elements during co-combustion. The combustion profiles of biomass was more complicated than that of coal gangue. Ignition property and thermal reactivity of coal gangue could be enhanced by the addition of biomass. No interactions were observed between coal gangue and biomass during co-combustion. The volatilization ratios of trace elements decrease with the increasing proportions of biomass in the blends during co-combustion. Based on the results of heating value, activation energy, base/acid ratio and gaseous pollutant emissions, the blending ratio of 20–30% biomass content is regarded as optimum composition for blending and could be applied directly at current combustion application with few modifications.

Chuncai Zhou; Guijian Liu; Ting Fang; Paul Kwan Sing Lam

2015-01-01T23:59:59.000Z

309

Larval Behavior and Natural Trace Element Signatures as Indicators of Crustacean Population Connectivity  

E-Print Network (OSTI)

variability in an atlas of trace element signatures forin creating a trace element atlas, our results show thatstage to create a trace element atlas in 2009 (Table 4.2),

Miller, Seth Haylen

2011-01-01T23:59:59.000Z

310

`Quantum explosion' of a trapped one-dimensional Bose gas  

E-Print Network (OSTI)

We analyze free expansion of a trapped one-dimensional Bose gas after a sudden release from the confining trap potential. By using the stationary phase and local density approximations, we show that the long-time asymptotic density profile and the momentum distribution of the gas are determined by the initial distribution of Bethe rapidities (quasimomenta) and hence can be obtained from the solutions to the thermodynamic Bethe ansatz equations. For expansion from a harmonic trap, and in the limits of very weak and very strong interactions, we recover the known scaling solutions of the hydrodynamic approach corresponding to self-similar expansion. For all other power-law traps and arbitrary interaction strengths, the expansion is not self-similar and shows strong dependence on the trap anharmonicity of the shape variation of the density profile during evolution. We also characterize dynamical fermionization of an expanding cloud in terms of its first- and second-order coherences describing phase and density fluctuations.

A. S. Campbell; D. M. Gangardt; K. V. Kheruntsyan

2015-01-15T23:59:59.000Z

311

NREL: Measurements and Characterization - Surface Analysis  

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

analysis, surface electronic properties NA NA NA NA NA NA NA NA NA Dynamic SIMS Cameca IMS- 5F & IMS-3F Trace-element contaminant and dopant analysis Ions (Cs, O, Ar)...

312

Trace elements in oil shale. Progress report, 1979-1980  

SciTech Connect

The purpose of this research program is to understand the potential impact of an oil shale industry on environmental levels of trace contaminants in the region. The program involves a comprehensive study of the sources, release mechanisms, transport, fate, and effects of toxic trace chemicals, principally the trace elements, in an oil shale industry. The overall objective of the program is to evaluate the environmental and health consequences of the release of toxic trace elements by shale and oil production and use. The baseline geochemical survey shows that stable trace elements maps can be constructed for numerous elements and that the trends observed are related to geologic and climatic factors. Shale retorted by above-ground processes tends to be very homogeneous (both in space and in time) in trace element content. Leachate studies show that significant amounts of B, F, and Mo are released from retorted shales and while B and Mo are rapidly flushed out, F is not. On the other hand, As, Se, and most other trace elements are not present in significant quantities. Significant amounts of F and B are also found in leachates of raw shales. Very large concentrations of reduced sulfur species are found in leachates of processed shale. Very high levels of B and Mo are taken up in some plants growing on processed shale with and without soil cover. There is a tendency for some trace elements to associate with specific organic fractions, indicating that organic chelation or complexation may play an important role. Many of the so-called standard methods for analyzing trace elements in oil shale-related materials are inadequate. A sampling manual is being written for the environmental scientist and practicing engineer. A new combination of methods is developed for separating the minerals in oil shale into different density fractions. Microbial investigations have tentatively identified the existence of thiobacilli in oil shale materials such as leachates. (DC)

Chappell, W R

1980-01-01T23:59:59.000Z

313

Sensitive ion detection device and method for analysis of compounds as vapors in gases  

DOE Patents (OSTI)

An ion mobility spectrometer (IMS) for the detection of trace gaseous molecular compounds dissolved or suspended in a carrier gas, particularly in ambient air, without preconcentration or the trapping of analyte particles. The IMS of the invention comprises an ionization volume of greater than 5 cm.sup.3 and preferably greater than 100 cm.sup.3. The larger size ionizers of this invention enable analysis of trace (<1 ppb) of sample compounds in the gas phase. To facilitate efficient ion motion through the large volume ionization and reaction regions of the IMS, an electric field gradient can be provided in the ionization region or in both the ionization and reaction regions. The systems can be implemented with radioactive ionization sources, corona discharge ion sources or ions can be formed by photoionization. In specific embodiments, particularly when the sample gas is ambient air, the sample gas is heater prior to entry into the instrument, the instrument is run at temperatures above ambient, and the instrument can be heated by contact with heated sample gas exiting the instrument.

Denton, M. Bonner; Sperline, Roger P

2014-02-18T23:59:59.000Z

314

EXPERIMENTAL STUDY OF ION INJECTION INTO AN EXTENDED TRAP OF THE BNL EBIS.  

SciTech Connect

Experiments on the BNL EBIS Test Stand (EBTS) with the ion trap extending beyond the edges of the superconducting solenoid had the main goal to study ion trap operation with a trap length exceeding that of the normal EBTS trap. Preliminary results indicate that the ion trap with length 107 cm is stable and controllable in the same fashion as our normal 70 cm trap with a multiampere electron beam. EBTS operation with ion trap 145 cm long and with electron current up to 3 A in earlier experiments also was stable and yielded more ions than from the basic ''short'' trap. These results increased our confidence in operation of the proposed RHIC in a stable mode and in the correctness of linear scaling of ion intensity with the length of the ion trap.

PIKIN,A.; ALESSI,J.; BEEBE,E.; KPONOU,A.; PRELEC,K.

2001-09-02T23:59:59.000Z

315

Coulomb crystal mass spectrometry in a digital ion trap  

E-Print Network (OSTI)

We present a mass spectrometric technique for identifying the masses and relative abundances of Coulomb-crystallized ions held in a linear Paul trap. A digital radiofrequency waveform is employed to generate the trapping potential, as this can be cleanly switched off, and static dipolar fields subsequently applied to the trap electrodes for ion ejection. Excellent detection efficiency is demonstrated for Ca+ and CaF+ ions from bi-component Ca+/CaF+ Coulomb crystals prepared by reaction of Ca+ with CH3F. A quantitative linear relationship is observed between ion number and the corresponding integrated TOF peak, independent of the ionic species. The technique is applicable to a diverse range of multi-component Coulomb crystals - demonstrated here for Ca+/NH3+/NH4+ and Ca+/CaOH+/CaOD+ crystals - and will facilitate the measurement of ion-molecule reaction rates and branching ratios in complicated reaction systems.

Deb, Nabanita; Smith, Alexander D; Keller, Matthias; Rennick, Christopher J; Heazlewood, Brianna R; Softley, Timothy P

2015-01-01T23:59:59.000Z

316

"Magic" radio-frequency dressing for trapped atomic microwave clocks  

E-Print Network (OSTI)

It has been proposed to use magnetically trapped atomic ensembles to enhance the interrogation time in microwave clocks. To mitigate the perturbing effects of the magnetic trap, "near-magic field" configurations are employed, where the involved clock transition becomes independent of the atoms potential energy to first order. Still, higher order effects are a dominating source for dephasing, limiting the perfomance of this approach. Here we propose a simple method to cancel the energy dependence to both, first and second order, using weak radio-frequency dressing. We give values for dressing frequencies, amplitudes, and trapping fields for 87Rb atoms and investigate quantitatively the robustness of these "second-order magic" conditions to variations of the system parameters. We conclude that radio-frequency dressing can suppress field-induced dephasing by at least one order of magnitude for typical experimental parameters.

Kazakov, Georgy A

2014-01-01T23:59:59.000Z

317

Trapped-flux internal-dipole superconducting motor/generator.  

SciTech Connect

A new class of motor/generator (M/G) utilizes the magnetic flux trapping capability of high-temperature superconductors (HTSs). The rotor, consists of a cylindrical shell composed of HTS segments. These segments act as trapped-field magnets, magnetized in such a way that a dipole magnetic field is produced in the interior of the shell. A stator coil assembly is placed in the interior of the shell and current passing through the conductors of the coil produce a rotational torque, either as a hysteresis motor or as a synchronous motor. The coil may be either conventional, with copper wires and an iron core, or composed of superconductors and can be used to establish the trapped fields in the HTSs.

Hull, J. R.

1998-09-03T23:59:59.000Z

318

Single Ion Trapping For The Enriched Xenon Observatory  

E-Print Network (OSTI)

In the last decade, a variety of neutrino oscillation experiments have established that there is a mass difference between neutrino flavors, without determining the absolute neutrino mass scale. The Enriched Xenon Observatory for neutrinoless double beta decay (EXO) will search for the rare decays of xenon to determine the absolute value of the neutrino mass. The experiment uses a novel technique to minimize backgrounds, identifying the decay daughter product in real time using single ion spectroscopy. Here, we describe single ion trapping and spectroscopy compatible with the EXO detector. We extend the technique of single ion trapping in ultrahigh vacuum to trapping in xenon gas. With this technique, EXO will achieve a neutrino mass sensitivity of ? m?? ≃ .010 eV.

Waldman, S J

2005-01-01T23:59:59.000Z

319

Electron capture by trapped Neq+ ions at very low energies  

Science Journals Connector (OSTI)

An electrostatic ion trap is used to trap Neq+ (1?q?10) ions created by a fast xenon beam passing through neon gas. Decay of a given charge state during the trapping time is due to electron-capture collisions with the ambient gas. Measurement of the decay constant versus density yields a rate constant, from which an effective cross section is derived. Neq+ + Ne (q=3-10) and Neq++Xe (q=6-10) collisions have been studied at mean collision energies in the range 1.0-70.0 eV. Marked oscillation of the effective capture cross sections with charge at fixed mean collision energies is observed. A strong velocity dependence of the effective cross section (rising as the velocity decreases) is observed for several collision pairs.

M. H. Prior; Richard Marrus; C. R. Vane

1983-07-01T23:59:59.000Z

320

Absorption by cold Fermi atoms in a harmonic trap  

E-Print Network (OSTI)

We study the absorption spectrum for a strongly degenerate Fermi gas confined in a harmonic trap. The spectrum is calculated using both the exact summation and also the Thomas-Fermi (TF) approximation. In the latter case, relatively simple analytical expressions are obtained for the absorption lineshape at large number of trapped atoms. At zero temperature, the approximated lineshape is characterized by a $(1-z^2)^{5/2}$ dependence which agrees well with the exact numerical calculations. At non-zero temperature, the spectrum becomes broader, although remains non-Gaussian as long as the fermion gas is degenerate. The changes in the trap frequency for an electronically excited atom can introduce an additional line broadening.

Gediminas Juzeliunas; Marius Masalas

2000-11-10T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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

Storing Electrons Instead of Positrons Without Trapping of Positive Ions  

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

Electrons Instead of Positrons Without Electrons Instead of Positrons Without Trapping of Positive Ions LS-75 T. K. Khoe October, 1986 In this note, a procedure to inject and store electrons in the ring without trapping ions will be described. The minimum injection current per bunch below which ion trapping occur will be determined. Since the vertical beam size is smaller than the horizontal beam size, we will consider the vertical motion only. The following assumptions are made: 1. The bunch period is much longer than the bunch length. This assumption allow us to use the thin lens approximation for the focusing effect of the electron bunch. 2. The bunch length is much larger than the transverse dimensions of the beam. A two-dimensional calculation can then be used to obtain the

322

E-Print Network 3.0 - atmospheric trace gas Sample Search Results  

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

Chemistry and Physics Discussions Trace gas measurements from... ., Rinsland, C. P., Stiller, G. P., and Zander, R.: On the assessment and uncertainty of atmospheric trace gas......

323

Double Well Potentials and Quantum Phase Transitions in Ion Traps  

Science Journals Connector (OSTI)

We demonstrate that the radial degree of freedom of strings of trapped ions in the quantum regime may be prepared and controlled accurately through the variation of the external trapping potential while at the same time its properties are measurable with high spatial and temporal resolution. This provides a new testbed giving access to static and dynamical properties of the physics of quantum-many-body systems and quantum phase transitions that are hard to simulate on classical computers. Furthermore, it allows for the creation of double well potentials with experimentally accessible tunneling rates, with applications in testing the foundations of quantum physics and precision sensing.

A. Retzker; R. C. Thompson; D. M. Segal; M. B. Plenio

2008-12-30T23:59:59.000Z

324

Quantum Phase Transitions in a Linear Ion Trap  

E-Print Network (OSTI)

We show that the quantum phase transition of the Tavis-Cummings model can be realised in a linear ion trap of the kind proposed for quantum computation. The Tavis-Cummings model describes the interaction between a bosonic degree of freedom and a collective spin. In an ion trap, the collective spin system is a symmetrised state of the internal electronic states of N ions, while the bosonic system is the vibrational degree of freedom of the centre of mass mode for the ions.

G. J. Milburn; Paul Alsing

2000-03-01T23:59:59.000Z

325

Sympathetic Cooling with Two Atomic Species in an Optical Trap  

Science Journals Connector (OSTI)

We simultaneously trap ultracold lithium and cesium atoms in an optical dipole trap formed by the focus of a CO2 laser and study the exchange of thermal energy between the gases. The optically cooled cesium gas efficiently decreases the temperature of the lithium gas through sympathetic cooling. Equilibrium temperatures down to 25 ?K have been reached. The measured cross section for thermalizing 133Cs-7Li collisions is 8×10-12 cm2, for both species unpolarized in their lowest hyperfine ground state. Besides thermalization, we observe evaporation of lithium purely through elastic cesium-lithium collisions (sympathetic evaporation).

M. Mudrich; S. Kraft; K. Singer; R. Grimm; A. Mosk; M. Weidemüller

2002-06-07T23:59:59.000Z

326

Electron Trapping in Shear Alfvén Waves that Power the Aurora  

Science Journals Connector (OSTI)

Results from 1D Vlasov drift-kinetic plasma simulations reveal how and where auroral electrons are accelerated along Earth’s geomagnetic field. In the warm plasma sheet, electrons become trapped in shear Alfvén waves, preventing immediate wave damping. As waves move to regions with larger vTe/vA, their parallel electric field decreases, and the trapped electrons escape their influence. The resulting electron distribution functions compare favorably with in situ observations, demonstrating for the first time a self-consistent link between Alfvén waves and electrons that form aurora.

Clare E. J. Watt and Robert Rankin

2009-01-26T23:59:59.000Z

327

Electron Trapping in Shear Alfven Waves that Power the Aurora  

SciTech Connect

Results from 1D Vlasov drift-kinetic plasma simulations reveal how and where auroral electrons are accelerated along Earth's geomagnetic field. In the warm plasma sheet, electrons become trapped in shear Alfven waves, preventing immediate wave damping. As waves move to regions with larger v{sub Te}/v{sub A}, their parallel electric field decreases, and the trapped electrons escape their influence. The resulting electron distribution functions compare favorably with in situ observations, demonstrating for the first time a self-consistent link between Alfven waves and electrons that form aurora.

Watt, Clare E. J.; Rankin, Robert [University of Alberta, Edmonton, Alberta (Canada)

2009-01-30T23:59:59.000Z

328

What To Do With Cold Traps and Why  

E-Print Network (OSTI)

of the 2012 Industrial Energy Technology Conference New Orleans, Louisiana, May 29-June 1, 2012 TABLE!1 Failure!Event Historical!Value Flare!Nozzle!Replacement $750,000! Analyzer!Failure!Plant!Shutdown $1,000,000! Flare"out!Fine $1,700,000! Gas... Orleans, Louisiana, May 29-June 1, 2012 TABLE!7 Failure!Events Annual!Cost!/!Trap (360!Traps!in!Unit) Flare!Nozzle!Replacement $694 Analyzer!Failure!Shuts!Plant $1,389 Flare"out!Fine $3,148 Gas!Compressor!Failure $5,000 Main!Turbine!Failure $11...

Risko, J. R.; Walter, J. P.

2012-01-01T23:59:59.000Z

329

Ion trapping in the emitter sheath in thermionic converters  

SciTech Connect

The effect of ion trapping in the emitter sheath in ignited thermionic converters is studied. The ion trapping prevents the emitter-sheath barrier from being higher than approximately 0.1 eV, when the current decreases in the converter. This gives a condition for the constriction of the arc. I-V curves are calculated for an ignited thermionic converter with a hydrodynamic plasma theory that takes into account the effect of Coulomb scattering and volume recombination, but assumes that the electron temperature is constant in the plasma.

Lundgren, L.

1985-12-01T23:59:59.000Z

330

Trapping dynamics of disilane on bare and monohydride-terminated Si(100)-2×1  

Science Journals Connector (OSTI)

The initial trapping probability of disilane on bare and monohydride-terminated Si(100)-2×1 surfaces was measured using molecular beam techniques. On the bare surface, trapping is shown to be very efficient, with near unit trapping probability at incident kinetic energies up to 0.2 eV, and nearly 50% trapping at 1 eV kinetic energy. The monohydride-terminated surface displays significantly less trapping efficiency than the bare surface. Interestingly, trapping probabilities decrease as the angle of incidence is increased, with the decrease becoming more pronounced at higher kinetic energies; this effect is discussed in terms of parallel momentum accommodation dynamics.

B.A. Ferguson; C.T. Reeves; C.B. Mullins

1999-01-01T23:59:59.000Z

331

Operation of a planar-electrode ion trap array with adjustable RF electrodes  

E-Print Network (OSTI)

One path to scaling-up trapped atomic ions for large-scale quantum computing and simulation is to create a two-dimensional array of ion traps in close proximity to each other. A method to control the interactions between nearest neighboring ions is demonstrated and characterized here, using an adjustable radio-frequency (RF) electrode between trapping sites. A printed circuit board planar-electrode ion trap is demonstrated, trapping laser-cooled $^{40}$Ca$^+$ ions. RF shuttling and secular-frequency adjustment are shown as a function of the power applied to the addressed RF electrode. The trapped ion's heating rate is measured via a fluorescence recooling method.

Muir Kumph; Philip Holz; Kirsten Langer; Michael Niedermayr; Michael Brownnutt; Rainer Blatt

2014-02-04T23:59:59.000Z

332

Casing design for trapped annular pressure buildup  

SciTech Connect

Conventional single-string analysis for casing design with annular-fluid expansion can underpredict or overpredict pressures between strings because multistring effects are neglected. Multiple-string systems with multiple sealed annuli behave as composite interactive systems. This paper presents a constitutive-based multistring analysis method for composite string effects and complex fluid behavior. The composite stiffness of cemented casings is determined from elastic stress/strain relationships, and the nonlinear fluid behavior is modeled by direct use of fluid PVT relations in the formulation and solution. The method is incorporated in a computer model linking comprehensive stress calculations to accurate temperature and pressure predictions. Sensitivity studies of the system response to various key parameters and operating conditions are presented, and comparisons are made with single-string analyses to demonstrate the strong interaction between casing strings.

Halal, A.S.; Mitchell, R.F. (Enertech Engineering Research Co., Houston, TX (United States))

1994-06-01T23:59:59.000Z

333

Halocarbon and Other Atmospheric Trace Species (HATS) | Data.gov  

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

Halocarbon and Other Atmospheric Trace Species (HATS) Halocarbon and Other Atmospheric Trace Species (HATS) Agriculture Community Menu DATA APPS EVENTS DEVELOPER STATISTICS COLLABORATE ABOUT Agriculture You are here Data.gov » Communities » Agriculture » Data Halocarbon and Other Atmospheric Trace Species (HATS) Dataset Summary Description The general mission of the Halocarbons and other Atmospheric Trace Species group is to quantify the distributions and magnitudes of sources and sinks for atmospheric nitrous oxide (N2O) and halogen containing compounds. HATS utilizes numerous types of platforms, including ground-based stations, towers, ocean vessels, aircraft, and balloons, to accomplish its mission. For a detailed mission statement, consult our FAQ. Tags {"nitrous oxide","sulfur hexaflouride",CFC-11,CFC-12,CFC-113,CCl4,CH3CCl3,CH3Cl,halon-1211,HCFC-22,HCFC-142b,halocarbons,chromatograph,aircraft,balloons,vessels,ships,towers,"natural resources",environment,air,"GHG "}

334

Laboratory measurements and modeling of trace atmospheric species  

E-Print Network (OSTI)

Trace species play a major role in many physical and chemical processes in the atmosphere. Improving our understanding of the impact of each species requires a combination of laboratory exper- imentation, field measurements, ...

Sheehy, Philip M. (Philip Michael)

2005-01-01T23:59:59.000Z

335

Time Series of Trace Element Concentrations Calculated from  

E-Print Network (OSTI)

a). A total of 120 samples were collected at sites within the Bay, outside the Golden Gate receives many waste water discharges, especially in areas south of the Dumbarton Bridge, that contain trace

336

A graphics architecture for ray tracing and photon mapping  

E-Print Network (OSTI)

Recently, methods were developed to render various global illumination e?ects with rasterization GPUs. Among those were hardware based ray tracing and photon mapping. However, due to current GPU??s inherent architectural limitations, the e...

Ling, Junyi

2005-11-01T23:59:59.000Z

337

A study on some trace elements in Chilean seafood  

Science Journals Connector (OSTI)

Levels of essential and toxic trace elements in six marine species greatly in demand in the international market (canned pink clams, razor clams, clams, king crab, sardines, and frozen albacore tuna fish) were...

N. Gras; L. Munoz; M. Thieck…

1993-03-01T23:59:59.000Z

338

Complex ray tracing study of electron cyclotron resonance heating  

Science Journals Connector (OSTI)

In the up-to-date ray tracing study of electron cyclotron resonance heating (ECRH) of fusion plasmas, energy absorption ... side of the tokamak plasmas approach the electron cyclotron resonance surface step by st...

Liu Hongxiu; Zhao Changlin

1986-03-01T23:59:59.000Z

339

Understanding reservoir mechanisms using phase and component streamline tracing  

E-Print Network (OSTI)

explored. The power and utility of the phase and component streamlines have been demonstrated using synthetic examples and two field cases. The new formulation of streamline tracing provides additional information about the reservoir drive mechanisms...

Kumar, Sarwesh

2009-05-15T23:59:59.000Z

340

TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID...  

Open Energy Info (EERE)

TRACING FLUID SOURCES IN THE COSO GEOTHERMAL SYSTEM USING FLUID-INCLUSION GAS CHEMISTRY Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings:...

Note: This page contains sample records for the topic "trap trace analysis" 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

The Fidelity and Trace Norm Distances for Quantifying Coherence  

E-Print Network (OSTI)

We investigate the coherence measures induced by fidelity and trace norm, based on the recent proposed coherence quantification in [Phys. Rev. Lett. 113, 140401, 2014]. We show that the fidelity of coherence does not in general satisfy the monotonicity requirement as a measure of coherence under the subselection of measurements condition. We find that the trace norm of coherence can act as a measure of coherence for qubit case and some special class of qutrits.

Lian-He Shao; Zhengjun Xi; Heng Fan; Yongming Li

2014-10-30T23:59:59.000Z

342

Technique for identifying, tracing, or tracking objects in image data  

DOE Patents (OSTI)

A technique for computer vision uses a polygon contour to trace an object. The technique includes rendering a polygon contour superimposed over a first frame of image data. The polygon contour is iteratively refined to more accurately trace the object within the first frame after each iteration. The refinement includes computing image energies along lengths of contour lines of the polygon contour and adjusting positions of the contour lines based at least in part on the image energies.

Anderson, Robert J. (Albuquerque, NM); Rothganger, Fredrick (Albuquerque, NM)

2012-08-28T23:59:59.000Z

343

Investigation of the reaction of OH and CO to form H and CO? by photoelectron-photofragment coincidence spectroscopy in a cryogenic ion beam trap  

E-Print Network (OSTI)

spectroscopy in a cryogenic ion beam trap A dissertationspectroscopy in a cryogenic ion beam trap by Christopherof the inclusion of a cryogenic ion beam trap, and its

Johnson, Christopher Joseph

2011-01-01T23:59:59.000Z

344

Trace element partitioning in Texas lignite  

E-Print Network (OSTI)

), but collected from the one of the secondary tanks which contains the slurry that exits the scrubber tower and is either recycled or sent to the thickener tank. 10. Bag house FGD (flue gas desulfurization system) fly ash fines (BHA): white-gray, dry, fine... Station. Concentrations of 41 elements were determined by neutron activation analysis. The particle size distribution was determined by Coulter counter analysis for the fly ash collected from the electrostatic precipitator outlets and from the flue...

Acevedo, Lillian Esther

1989-01-01T23:59:59.000Z

345

Laser Based Techniques for Ultra Trace Isotope Production, Spectroscopy and Detection  

SciTech Connect

A variety of research activities in the field of fundamental and applied nuclear physics has evolved in the last years using resonantly tuned radiation from powerful lasers. The technique of resonance ionization spectroscopy has delivered outstanding results and found broad acceptance in the last years as a particularly efficient and highly selective method for rare and exotic radioisotope studies. It is used for production, spectroscopy and detection of these species and provides complete isobaric, high isotopic and even some isomeric selection, which altogether is needed for on-line investigation of short lived species far off stability as well as for ultra trace determination. Good overall efficiency pushes the experimental limits of detection in elemental trace analysis down to below 106 atoms per sample, and additionally isotopic selectivity as high as 3 ? 1012 has been demonstrated. The widespread potential of resonance ionization techniques is discussed, focusing on the experimental arrangements for applications in selective on-line isotope production, spectroscopy of rare radioisotopes and ultra trace determination of radiotoxic isotopes like 238Pu to 244Pu, 135,137Cs, 89,90Sr or 41Ca in environmental, technical and biomedical samples.

Wendt, K.; Blaum, K; Geppert, C; Muller, P; Nortershauser, W.; Schmitt, Annette; Schumann, P; Trautmann, Norbert; Bushaw, Bruce A.

2006-06-26T23:59:59.000Z

346

MeTAGeM-Trace: Improving trace generation in model transformation by leveraging the role of transformation models  

Science Journals Connector (OSTI)

Abstract In the context of Model-Driven Engineering (MDE), generation of traces can be automated using the implicit traceability relationships contained in any model transformation. Besides, if transformations are developed adopting a Model-Driven Engineering (MDE) approach, i.e. promoting the role of models and the level of automation, model transformation will benefit from the promised advantages of MDE in terms of less costly software development while reducing the inherent complexity of coding model transformations. To put these ideas into practice, this work introduces MeTAGeM-Trace, the first prototype of an EMF-based toolkit for the MDD of model-to-model transformations which supports trace generation, i.e. it allows developing model transformations that produce not only the corresponding target models, but also a trace model between the elements of the source and target models involved in the transformation.

Álvaro Jiménez; Juan M. Vara; Verónica A. Bollati; Esperanza Marcos

2015-01-01T23:59:59.000Z

347

Paul trapping of charged particles in aqueous solution  

Science Journals Connector (OSTI)

...1]. Oxygen plasma treatment was...surrounding ionic atmosphere to the motion of...ii) Trapping with large fluctuations...V) Frequency (MHz) b q a i 1...with the surface area of the particle...V, and f=2.5 MHz, using the device...

Weihua Guan; Sony Joseph; Jae Hyun Park; Predrag S. Krsti?; Mark A. Reed

2011-01-01T23:59:59.000Z

348

Reversed magnetization A NOVEL DEVICE FOR CONTINUOUS FLOW MAGNETIC TRAPPING  

E-Print Network (OSTI)

1. 3 µm5 µm Reversed magnetization A NOVEL DEVICE FOR CONTINUOUS FLOW MAGNETIC TRAPPING AND SORTING Martin d'hères, France ABSTRACT The manipulation of magnetically labeled bio-objects of nano or micrometer sizes is now realizable by combining the magnetic forces with microfluidics. This paper reports

Paris-Sud XI, Université de

349

Measuring the Neutron Lifetime Using Magnetically Trapped Neutrons  

E-Print Network (OSTI)

The neutron beta-decay lifetime plays an important role both in understanding weak interactions within the framework of the Standard Model and in theoretical predictions of the primordial abundance of 4He in Big Bang Nucleosynthesis. In previous work, we successfully demonstrated the trapping of ultracold neutrons (UCN) in a conservative potential magnetic trap. A major upgrade of the apparatus is nearing completion at the National Institute of Standards and Technology Center for Neutron Research (NCNR). In our approach, a beam of 0.89 nm neutrons is incident on a superfluid 4He target within the minimum field region of an Ioffe-type magnetic trap. A fraction of the neutrons is downscattered in the helium to energies <200 neV, and those in the appropriate spin state become trapped. The inverse process is suppressed by the low phonon density of helium at temperatures less than 200 mK, allowing the neutron to travel undisturbed. When the neutron decays the energetic electron ionizes the helium, producing sci...

O'Shaughnessy, C M; Schelhammer, K W; Swank, C M; Seo, P -N; Huffman, P R; Dzhosyuk, S N; Mattoni, C E H; Yang, L; Doyle, J M; Coakley, K J; Thompson, A K; Mumm, H P; Lamoreaux, S K; Yang, G

2009-01-01T23:59:59.000Z

350

Non-Diversification Traps in Catastrophe Insurance Markets Rustam Ibragimov  

E-Print Network (OSTI)

markets, even though there is a large enough market capacity to reach full risk sharing throughNon-Diversification Traps in Catastrophe Insurance Markets Rustam Ibragimov Dwight Jaffee Johan Walden§ Abstract We develop a model for markets for catastrophic risk. The model explains why insurance

Chaudhuri, Sanjay

351

Gene Traps: Tools for Plant Development and Genomics  

Science Journals Connector (OSTI)

...activates GFP expression from the UAS. A battery of enhancer trap lines expressing this...genomic DNA flanking the insertions (). Thermal asymmetric interlaced PCR is particularly...Arabidopsis thaliana T-DNA insert junctions by thermal asymmetric interlaced PCR Lloyd A.M...

Patricia S. Springer

352

The TITAN in-trap decay spectroscopy facility at TRIUMF  

E-Print Network (OSTI)

This article presents an upgraded in-trap decay spectroscopy apparatus which has been developed and constructed for use with TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). This device consists of an open-access electron-beam ion-trap (EBIT), which is surrounded radially by seven low-energy planar Si(Li) detectors. The environment of the EBIT allows for the detection of low-energy photons by providing backing-free storage of the radioactive ions, while guiding charged decay particles away from the trap centre via the strong (up to 6 T) magnetic field. In addition to excellent ion confinement and storage, the EBIT also provides a venue for performing decay spectroscopy on highly-charged radioactive ions. Recent technical advancements have been able to provide a significant increase in sensitivity for low-energy photon detection, towards the goal of measuring weak electron-capture branching ratios of the intermediate nuclei in the two-neutrino double beta ($2\

K. G. Leach; A. Grossheim; A. Lennarz; T. Brunner; J. R. Crespo López-Urrutia; A. T. Gallant; M. Good; R. Klawitter; A. A. Kwiatkowski; T. Ma; T. D. Macdonald; S. Seeraji; M. C. Simon; C. Andreoiu; J. Dilling; D. Frekers

2014-05-28T23:59:59.000Z

353

Trapping and Frequency Variability in Electron Acoustic Waves  

E-Print Network (OSTI)

Trapping and Frequency Variability in Electron Acoustic Waves C.F. Driscoll, F. Anderegg, D 92093 USA Abstract. Electron Acoustic Waves (EAWs) with a phase velocity less than twice the plasma Langmuir waves, and at large excitations resonance is observed over a broad range. Laser Induced

California at San Diego, University of

354

Quantum Reservoir Engineering with Laser Cooled Trapped Ions  

Science Journals Connector (OSTI)

We show how to design different couplings between a single ion trapped in a harmonic potential and an environment. The coupling is due to the absorption of a laser photon and subsequent spontaneous emission. The variation of the laser frequencies and intensities allows one to “engineer” the coupling and select the master equation describing the motion of the ion.

J. F. Poyatos; J. I. Cirac; P. Zoller

1996-12-02T23:59:59.000Z

355

Light Trapping in Solar Cells Using Resonant Nanostructures P. Spinelli  

E-Print Network (OSTI)

Light Trapping in Solar Cells Using Resonant Nanostructures P. Spinelli #12;Summary Photovoltaics solar cell is reduced, due to incomplete absorption of light. In this thesis, we investigate new ways of enhancing light absorption in Si solar cells by using nanostructures that show resonant interaction

van Rooij, Robert

356

Landau Damping of Spin Waves in Trapped Boltzmann Gases  

E-Print Network (OSTI)

levels of trapped ultra-cold 87Rb atoms in the nondegenerate regimes. As in spin-polarized Boltzmann) where is the mean-field frequency, S+(z) = s+(z, p)n(p) dp and n(p) = (2mkBT)-1/2 exp[-p2/(2mk

Mullin, William J.

357

Momentum distribution and correlation function of quasicondensates in elongated traps  

Science Journals Connector (OSTI)

We calculate the spatial correlation function and momentum distribution of a phase-fluctuating, elongated three-dimensional condensate in a trap and in free expansion. We take the inhomogeneous density profile into account via a local-density approximation. We find an almost Lorentzian momentum distribution, in stark contrast with a Heisenberg-limited Thomas-Fermi condensate.

F. Gerbier; J. H. Thywissen; S. Richard; M. Hugbart; P. Bouyer; A. Aspect

2003-05-27T23:59:59.000Z

358

Multiple isotope magneto-optical trap from a single diode laser  

Science Journals Connector (OSTI)

We present a dual isotope magneto-optical trap produced using a single diode laser. We generate all the optical frequencies needed for trapping both species using a fiber intensity...

Valenzuela, Victor Manuel; Hamzeloui, Saeed; Gutiérrez, Monica; Gomez, Eduardo

2013-01-01T23:59:59.000Z

359

GreenPower Trap Water-Muffler System | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

GreenPower Trap Water-Muffler System GreenPower Trap Water-Muffler System This hydrated EGR system reduces NOx and enhances fuel efficiency, and the DPF is catalyzed by the...

360

Loading a planar RF Paul Trap from a cold Yb? source  

E-Print Network (OSTI)

In this thesis, we demonstrate a functioning planar radio frequency, three-rod Paul Trap, loaded with Yb+ ions that have been photoionized from a source of neutral atoms, which were cooled in a magneto-optical trap. Planar ...

Shields, Brendan John

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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

Ensemble method to measure the potential energy of nanoparticles in an optical trap  

Science Journals Connector (OSTI)

A method is described for measuring the potential energy of nanoparticles in an optical trap by trapping an ensemble of particles with a focused laser beam. The force balance between...

Junio, Joseph; Ng, Jack; Cohen, Joel A; Lin, Zhifang; Ou-Yang, H Daniel

2011-01-01T23:59:59.000Z

362

Finite-geometry models of electric field noise from patch potentials in ion traps  

E-Print Network (OSTI)

We model electric field noise from fluctuating patch potentials on conducting surfaces by taking into account the finite geometry of the ion trap electrodes to gain insight into the origin of anomalous heating in ion traps. ...

Low, Guang Hao

363

Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study...  

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

Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study on Sulfur Effects Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study on Sulfur Effects Presentation given...

364

Dynamics of excitons in a potential trap at ultra-low temperatures: paraexcitons in Cu2O  

Science Journals Connector (OSTI)

We present experiments on the luminescence of excitons confined in a potential trap at sub-Kelvin temperatures after nanosecond pulsed laser excitation. Analysis of the experimental results with a rate model shows that the so-called Auger decay of yellow excitons, which in previous studies led to a rapid decay of the excitons at high densities and thus prevented reaching the critical density for Bose–Einstein condensation (BEC), is greatly reduced for paraexcitons. We demonstrate that exciton numbers well above 1010 can be collected in a potential trap, albeit at temperatures in the 10 K range. During their lifetime of about 500 ns the paraexcitons cool down to the temperature of the He bath. This opens up the possibility to observe a BEC of paraexcitons provided that the bath temperature can be reduced to below 100 mK.

Rico Schwartz; Nobuko Naka; Frank Kieseling; Heinrich Stolz

2012-01-01T23:59:59.000Z

365

Ray tracing of ion-cyclotron waves in a coronal funnel  

E-Print Network (OSTI)

Remote observations of coronal holes have strongly implicated the kinetic interactions of ion-cyclotron waves with ions as a principal mechanism for plasma heating and acceleration of the fast solar wind. In order to study these waves, a linear perturbation analysis is used in the work frame of the collisionless multi-fluid model. We consider a non-uniform background plasma describing a funnel region and use the ray tracing equations to compute the ray path of the waves as well as the spatial variation of their properties.

R. Mecheri; E. Marsch

2007-06-07T23:59:59.000Z

366

Ray tracing of ion-cyclotron waves in a coronal funnel  

E-Print Network (OSTI)

Remote observations of coronal holes have strongly implicated the kinetic interactions of ion-cyclotron waves with ions as a principal mechanism for plasma heating and acceleration of the fast solar wind. In order to study these waves, a linear perturbation analysis is used in the work frame of the collisionless multi-fluid model. We consider a non-uniform background plasma describing a funnel region and use the ray tracing equations to compute the ray path of the waves as well as the spatial variation of their properties.

Mecheri, R

2007-01-01T23:59:59.000Z

367

Quality tracing in meat supply chains  

Science Journals Connector (OSTI)

...The non-parametric test Kruskal-Wallis one-way analysis of variance...differentiated statistically (Kruskal-Wallis test, p=0.454). All sensory...about appropriate use of the Kruskal-Wallis test. Anim. Behav. 76, 1083-1087...

2014-01-01T23:59:59.000Z

368

An all-glass microfluidic cell for the ABEL trap: fabrication and Adam E. Cohen  

E-Print Network (OSTI)

An all-glass microfluidic cell for the ABEL trap: fabrication and modeling Adam E. Cohen Department trap is a microfluidic cell. In previous incarnations of the ABEL trap, the microfluidic cell microfluidic cell, made entirely out of glass. This new design significantly decreases the rate

Shapiro, Benjamin

369

How to assess light trapping structures versus a Lambertian Scatterer for solar cells ?  

E-Print Network (OSTI)

How to assess light trapping structures versus a Lambertian Scatterer for solar cells ? Christian trapping nanostructures for solar cells, which we call the light trapping efficiency (LTE). The LTE has in thin Si solar cells by diffuse back reflectors," Proceedings of the 15th IEEE Photovoltaic Specialists

370

Reduction of the trapping of positrons in dislocated single crystals of iron when charged with hydrogen  

SciTech Connect

The positron annihilation measurement was carried out with the pure iron single crystals deformed in various ways before and after hydrogen permeation. The positron trapping intensity was reduced more in the screw dislocation than in the edge dislocation by hydrogen charging. The trap occupancy by hydrogen was very close to the fraction of the reduction in positron trapping intensity.

Park, Y.K.; Waber, J.T.; Snead, C.L. Jr.

1985-01-01T23:59:59.000Z

371

Solar Cell Light Trapping beyond the Ray Optic Limit Dennis M. Callahan,* Jeremy N. Munday,  

E-Print Network (OSTI)

Solar Cell Light Trapping beyond the Ray Optic Limit Dennis M. Callahan,* Jeremy N. Munday: Photovoltaic cell, solar cell, local density of optical states (LDOS), light trapping, plasmonic, nanophotonic light trapping, as the solar cell absorber layer thickness is reduced, absorption is also reduced

Atwater, Harry

372

Towards trapped antihydrogen L.V. Jrgensen a,*, G. Andresen b  

E-Print Network (OSTI)

of antihydrogen physics. The next big step forward is expected to be the trapping of the formed antihydrogen atoms using a magnetic multipole trap. ALPHA is a new international project that started to take data in 2006 in a nested Penning trap [3]. After formation the antihydrogen was no longer bound by the electric

Wurtele, Jonathan

373

Observations on the incorporation of trace elements in halite of Oligocene salt beds, Bourg-en-Bresse Basin, France  

SciTech Connect

It is common practice to employ trace elements found in chloride salts as indicators of the conditions of deposition. Because some halite contains abundant fluid inclusions, it is necessary to separate the salt from the inclusions before analysis. This study presents the data derived from the use of a simple preparative technique which permits analysis of the trace elements in solid halite, and provides a guide to test the success in elimination of the contaminants contained in the fluid inclusions. The differentiation is accomplished simply by crushing the salt in alcohol followed by separate analysis of the fluid and solid components, thus yielding accurate trace element concentrations in the solids (crystal lattice, dislocations, and grain boundaries) and the fluids. Br and K are present both in the solid and liquid phases of the halite, but Mg is exclusively in the fluid inclusions. The elimination of the Mg from the analysis of the solid phase may thus be employed as a monitor to indicate the degree of purification of the samples being analyzed.

Moretto, R. (Universite de Nancy I, Vandoeuvre-les-Nancy (France))

1988-12-01T23:59:59.000Z

374

Trace element fingerprinting of ancient Chinese gold with femtosecond laser  

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

Trace element fingerprinting of ancient Chinese gold with femtosecond laser Trace element fingerprinting of ancient Chinese gold with femtosecond laser ablation-inductivity coupled mass spectrometry Title Trace element fingerprinting of ancient Chinese gold with femtosecond laser ablation-inductivity coupled mass spectrometry Publication Type Journal Article Year of Publication 2009 Authors Brostoff, Lynn B., Jhanis J. Gonzalez, Paul Jett, and Richard E. Russo Journal Journal of Archeological Science Volume 36 Start Page 461 Issue 2 Pagination 461-466 Date Published 02/2009 Keywords Ancient gold, femtosecond, la-icp-ms, Trace element Abstract In this collaborative investigation, femtosecond laser ablation-inductively coupled mass spectrometry (LA-ICP-MS) was applied to the study of a remarkable group of ancient Chinese gold objects in the Smithsonian's Freer Gallery of Art and Arthur M. Sackler Gallery. Taking advantage of the superior ablation characteristics and high precision of a femtosecond 266 nm Ti:sapphire laser at Lawrence Berkeley National Laboratory, major, minor and trace element concentrations in the gold fragments were quantified. Results validate use of femtosecond LA-ICP-MS for revealing ''fingerprints'' in minute gold samples. These fingerprints allow us to establish patterns based on the association of silver, palladium and platinum that support historical, technical and stylistic relationships, and shed new light on these ancient objects.

375

Amplification of trace amounts of nucleic acids  

DOE Patents (OSTI)

Methods of reducing background during amplification of small amounts of nucleic acids employ careful analysis of sources of low level contamination. Ultraviolet light can be used to reduce nucleic acid contaminants in reagents and equipment. "Primer-dimer" background can be reduced by judicious design of primers. We have shown clean signal-to-noise with as little as starting material as one single human cell (.about.6 picogram), E. coli cell (.about.5 femtogram) or Prochlorococcus cell (.about.3 femtogram).

Church, George M. (Brookline, MA); Zhang, Kun (Brighton, MA)

2008-06-17T23:59:59.000Z

376

Trace metals in sediments of coastal Siberia  

E-Print Network (OSTI)

by a series of linear dispersions at various depths (Holmes and Creager, 1974). Sediments of the Laptev Sea are predominately fine grained, predominately silty- clays and clay-silts. The major rivers flowing to the Laptev Sea cross the wide coastal..., blanks, blank- spikes, sample spikes and duplicates The sediment samples were also analyzed by Instrumental Neutron Activation Analysis (INAA). They were prepared for this by packing 0. 50 g of dry sediment into pre-cleaned polyethylene vials. Six...

Esnough, Teresa Elizabeth

1996-01-01T23:59:59.000Z

377

A comparison study of gravid and under house CO2 mosquito traps in Harris County, Texas  

E-Print Network (OSTI)

Traps in Harris County, Texas. (May 2008) Stephanie Lyn White, B.S.; B.S., Texas A&M University Chair of Advisory Committee: Dr. Michael P. Ward Harris County Mosquito Control Division (HCMCD) is responsible for surveillance of mosquito species...2 traps for WNV and SLE virus surveillance. Adjusting for the week of collection, results suggest that Gravid traps caught significantly (P = 0.009) more mosquitoes (mean = 23.134 per trap) in the study area than Underhouse traps (mean = 3...

White, Stephanie Lyn

2008-10-10T23:59:59.000Z

378

Building Energy Software Tools Directory: TRACE Load 700  

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

Load 700 Load 700 TRACE Load 700 logo. Use TRACE Load 700 software - the building and load design modules of TRACE 700, Trane Air Conditioning Economics - to evaluate the effect of building orientation, size, shape, and mass based on hourly weather data and the resulting heat-transfer characteristics of air and moisture. To assure calculation integrity, the program uses algorithms recommended by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE). Choose from eight different ASHRAE cooling and heating methodologies, including the Exact Transfer Function. The program encourages "what if" analyses, allowing the user to enter construction details in any order and then easily change the resulting building model as the design progresses. Multiple project views and "drag-and-drop"

379

CSIRO GASLAB Network: Individual Flask Measurements of Atmospheric Trace  

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

GASLAB Network GASLAB Network CSIRO GASLAB Network: Individual Flask Measurements of Atmospheric Trace Gases (April 2003) data Data Investigators L.P. Steele, P.R. Krummel, and R.L. Langenfelds Commonwealth Scientific and Industrial Research Organisation (CSIRO) DOI 10.3334/CDIAC/atg.db1021 Data are available for four atmospheric trace gases at nine stationary sites and one moving platform (aircraft over Cape Grim, Tasmania, and Bass Strait, between the Australian continent and Tasmania). The trace gases are carbon dioxide (CO2), methane (CH4), carbon monoxide (CO), and hydrogen (H2). Measurements of δ13C from CO2 are also included in this database. The nine stationary sites are, from north to south: Alert, Canada; Shetland Islands, Scotland; Estevan Point, Canada; Mauna Loa, Hawaii; Cape Ferguson,

380

Natchez Trace Elec Power Assn | Open Energy Information  

Open Energy Info (EERE)

Natchez Trace Elec Power Assn Natchez Trace Elec Power Assn Jump to: navigation, search Name Natchez Trace Elec Power Assn Place Mississippi Utility Id 13227 Utility Location Yes Ownership C NERC Location SERC NERC SERC Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png General Service (1001 kW-5000kW) Industrial General Service (50 kW and Under) Commercial General Service (51 kW-1000 kW) Commercial Outdoor Lighting HPS 100 W Lighting Outdoor Lighting HPS 100 W Dedicated Pole Lighting Outdoor Lighting HPS 100 W Dedicated Pole & Transformer Lighting Outdoor Lighting HPS 100 W Dedicated Transformer Lighting

Note: This page contains sample records for the topic "trap trace analysis" 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

A Toy Model Study of Decay Trapping | Superconducting Magnet Division  

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

A Toy Model Study of Decay Trapping, reported by Brett Parker A Toy Model Study of Decay Trapping, reported by Brett Parker Introduction A group from the BNL Superconducting Magnet Division is looking at various options for dipole magnets which would be suitable for use in a muon storage ring that is used as a neutrino factory. Since the useful neutrino beams from a neutrino factory come from straight sections it is desirable to minimize the rings arc circumference, in relation to straight section length, in order to ensure that the fraction of muons which decay in the straight section is as large as possible. Therefore superconducting magnets, with higher B-fields and smaller bend radii, are reasonable to consider for this application. Unfortunately the decay electrons generated along with the neutrinos carry on average about a third of the original

382

Photoionization of strontium for trapped-ion quantum information processing  

E-Print Network (OSTI)

We report a demonstration of simple and effective loading of strontium ions into a linear radio frequency Paul trap using photoionization. The ionization pathway is 5s2 1S0 -- 5s5p 1P1 -- 5p2 1D2, and the 5p2 1D2 final state is auto-ionizing. Both transitions are driven using diode lasers: a grating-stabilized 922 nm diode doubled in a single pass through potassium niobate to 461 nm and a bare diode at 405 nm. Using this technique, we have reduced the background pressure during the ion loading process by a factor of 2 compared to the conventional technique of electron bombardment. Initial ion temperatures are low enough that the ions immediately form crystals. It is also possible to observe the trapping region with a CCD camera during ion creation, allowing specific ion number loading with high probability.

K. Vant; J. Chiaverini; W. Lybarger; D. J. Berkeland

2006-07-07T23:59:59.000Z

383

Measurement-Induced Vibrational Dynamics of a Trapped Ion  

Science Journals Connector (OSTI)

Excitation spectra of an individual trapped 138Ba+ ion show sidebands of radial and axial ion vibration in the trap. The second-order sidebands involving radial and axial vibrations would allow swapping these vibrational states; they represent an inverse Raman effect with the role of electronic and vibrational excitation interchanged. Deexcitation sidebands differ from excitation sidebands as the vibrational distribution in the D5/2 level is modified by the ion being reduced to this level in null observations of resonance light. Delayed deexcitation goes along with stochastic cooling that makes the ion collapse into the Fock state |n=1?. Sideband modulation is identified as stroboscopic detection of the light-induced nutation on a vibrational transition with ?n=±1.

B. Appasamy; Y. Stalgies; P. E. Toschek

1998-03-30T23:59:59.000Z

384

Engineering two-mode interactions in ion traps  

E-Print Network (OSTI)

We describe how two vibrational degrees of freedom of a single trapped ion can be coupled through the action of suitably-chosen laser excitation. We concentrate on a two-dimensional ion trap with dissimilar vibrational frequencies in the x- and y-directions of motion, and derive from first principles a variety of quantized two-mode couplings, concentrating on a linear coupling which takes excitations from one mode to another. We demonstrate how this can result in a state rotation, in which it is possible to transfer the motional state of the ion from say the x-direction to the y-direction without prior knowledge of that motional state.

J. Steinbach; J. Twamley; P. L. Knight

1997-08-04T23:59:59.000Z

385

Engineering superpositions of displaced number states of a trapped ion  

E-Print Network (OSTI)

We present a protocol that permits the generation of a subtle with superposition with 2^(l+1) displaced number states on a circle in phase space as target state for the center-of-mass motion of a trapped ion. Through a sequence of 'l' cycles involving the application of laser pulses and no-fluorescence measurements, explicit expressions for the total duration of laser pulses employed in the sequence and probability of getting the ion in the upper electronic state during the 'l' cycles are obtained and analyzed in detail. Furthermore, assuming that the effective relaxation process of a trapped ion can be described in the framework of the standard master equation for the damped harmonic oscillator, we investigate the degradation of the quantum interference effects inherent to superpositions via Wigner function.

Marcelo A. Marchiolli; Wagner D. Jose

2004-04-05T23:59:59.000Z

386

Freely floating structures trapping time-harmonic water waves (revisited)  

E-Print Network (OSTI)

We study the coupled small-amplitude motion of the mechanical system consisting of infinitely deep water and a structure immersed in it. The former is bounded above by a free surface, whereas the latter is formed by an arbitrary finite number of surface-piercing bodies floating freely. The mathematical model of time-harmonic motion is a spectral problem in which the frequency of oscillations serves as the spectral parameter. It is proved that there exist axisymmetric structures consisting of $N \\geq 2$ bodies; every structure has the following properties: (i) a time-harmonic wave mode is trapped by it; (ii) some of its bodies (may be none) are motionless, whereas the rest of the bodies (may be none) are heaving at the same frequency as water. The construction of these structures is based on a generalization of the semi-inverse procedure applied earlier for obtaining trapping bodies that are motionless although float freely.

Nikolay Kuznetsov; Oleg Motygin

2014-10-22T23:59:59.000Z

387

Wolf Trap, Virginia: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Trap, Virginia: Energy Resources Trap, Virginia: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 38.9398329°, -77.286094° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":38.9398329,"lon":-77.286094,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

388

Isoelectric Trapping and Mass Spectrometry: Tools for Proteomics  

E-Print Network (OSTI)

ISOELECTRIC TRAPPING AND MASS SPECTROMETRY: TOOLS FOR PROTEOMICS A Dissertation by STEPHANIE MARIE COLOGNA Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Chair of Committee, David H. Russell Committee Members, Paul S. Cremer Arul Jayaraman Gyula Vigh Head of Department, David H...

Cologna, Stephanie Marie

2012-02-14T23:59:59.000Z

389

Adiabatic trapping in coupled kinetic Alfven-acoustic waves  

SciTech Connect

In the present work, we have discussed the effects of adiabatic trapping of electrons on obliquely propagating Alfven waves in a low {beta} plasma. Using the two potential theory and employing the Sagdeev potential approach, we have investigated the existence of arbitrary amplitude coupled kinetic Alfven-acoustic solitary waves in both the sub and super Alfvenic cases. The results obtained have been analyzed and presented graphically and can be applied to regions of space where the low {beta} assumption holds true.

Shah, H. A.; Ali, Z. [Department of Physics, G.C. University, 54000 Lahore (Pakistan); Masood, W. [COMSATS, Institute of Information Technology, Park Road, Chak Shahzad, Islamabad 44000 (Pakistan); National Centre for Physics (NCP), Shahdara Valley Road, 44000 Islamabad (Pakistan); Theoretical Plasma Physics Division, P. O. Nilore, Islamabad (Pakistan)

2013-03-15T23:59:59.000Z

390

Phase-dependent coherent population trapping and optical switching  

SciTech Connect

We propose a scheme for achieving phase-dependent coherent population trapping, showing that both the dark state of the atoms and light propagation dynamics depend on the relative phase of the fields. The atomic coherence prepared via adiabatic process plays a key role in the interaction of light with matter. And an optical switching based on the phase-controlled quantum interference is implemented, which may have potential application in high-speed optical communications and quantum information systems.

Kou, J. [College of Physics, Jilin University, Changchun 130023 (China); Quantum Engineering Center, Beijing Institute of Control Device, Beijing 100854 (China); Wan, R. G.; Kang, Z. H.; Jiang, L.; Wang, L.; Jiang, Y.; Gao, J. Y. [College of Physics, Jilin University, Changchun 130023 (China)

2011-12-15T23:59:59.000Z

391

Heat Trace and Functional Determinant in One Dimension  

E-Print Network (OSTI)

We study the spectral properties of the Laplace type operator on the circle. We discuss various approximations for the heat trace, the zeta function and the zeta-regularized determinant. We obtain a differential equation for the heat kernel diagonal and a recursive system for the diagonal heat kernel coefficients, which enables us to find closed approximate formulas for the heat trace and the functional determinant which become exact in the limit of infinite radius. The relation to the generalized KdV hierarchy is discussed as well.

Ivan G Avramidi

2014-06-05T23:59:59.000Z

392

Fabrication and heating rate study of microscopic surface electrode ion traps  

E-Print Network (OSTI)

We report heating rate measurements in a microfabricated gold-on-sapphire surface electrode ion trap with trapping height of approximately 240 micron. Using the Doppler recooling method, we characterize the trap heating rates over an extended region of the trap. The noise spectral density of the trap falls in the range of noise spectra reported in ion traps at room temperature. We find that during the first months of operation the heating rates increase by approximately one order of magnitude. The increase in heating rates is largest in the ion loading region of the trap, providing a strong hint that surface contamination plays a major role for excessive heating rates. We discuss data found in the literature and possible relation of anomalous heating to sources of noise and dissipation in other systems, namely impurity atoms adsorbed on metal surfaces and amorphous dielectrics.

N. Daniilidis; S. Narayanan; S. A. Möller; R. Clark; T. E. Lee; P. J. Leek; A. Wallraff; St. Schulz; F. Schmidt-Kaler; H. Häffner

2010-09-15T23:59:59.000Z

393

Diffraction analysis of rotationally symmetric optical systems using computer-generated aberration polynomials  

Science Journals Connector (OSTI)

A ray trace scheme for the automatic generation of optical aberration polynomials to arbitrary orders pioneered by T. B. Andersen is successfully applied to the diffraction analysis of...

Tam, S C; Lewis, G D W; Doric, S; Heshmaty-Manesh, D

1983-01-01T23:59:59.000Z

394

E-Print Network 3.0 - analysis atmospheric deposition Sample...  

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

3 Chapter 2: Sources and Deposition of Trace Metals 2.1 Main Sources of Atmospheric Pollution...7 Summary: and dry deposition analysis...

395

Analysis  

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

Analysis Analysis of Short-Bunch Production with the APS Booster and a Bunch Compressor Michael Borland, AOD/OAG ∗ August 8, 2003 1 Abstract There is significant interest among x-ray scientists in short-pulse x-rays. The x-rays from the APS ring, although very bright, are produced by an electron bunch with an rms length of more than 30 ps. Typically, it is only a linear accelerator that can produce a very short bunch. An idea was brought to my attention by Glenn Decker that might allow us to produce a short bunch using the APS booster. This idea involves extracting the beam from the booster at 3 to 4 GeV, while it is still relatively short, then compressing it with a magnetic bunch compressor. In this note, we present a preliminary analysis of this idea, along with the related idea of using a nonequilibrium beam from the APS photoinjector. 2 Background We will begin with an examination of the ideal result

396

Plasma production by the trapping of energetic atoms  

Science Journals Connector (OSTI)

The production of a hot plasma by the injection of streams of energetic atoms into a confining magnetic field is discussed. The experiments described are directed towards injection of 20-keV hydrogen or deuterium atoms into a magnetic mirror field. The results of some numerical calculations of the plasma growth to a steady-state in a constant magnetic field are presented, including the calculation of the spatial distribution of the trapped ions. In these calculations, the primary trapping mechanism is the ionization of beam atoms by trapped ions and electrons. Parametric values are assigned to approximate the experimentally attainable conditions. The indicated equilibrium densities are in the range of 1014/cm3, at ? ? 1%, with typical growth times of a few seconds, if the final density is determined by ion-ion scattering into the mirror loss cone.The practical achievement of a hot plasma by this injection method depends upon maximizing the trapping rate, and minimizing the particle loss due to charge-exchange scattering. Severe requirements are therefore placed on the atomic beam intensity and the gas density in the confinement region. Some of the requirements on the build-up conditions imposed by plasma stability considerations are also discussed.Progress toward meeting the technological requirements is described. A highly collimated beam of hydrogen atoms in excess of 5 × 1017 atoms/sec at 20-keV energy has been produced. The cross-sectional area of the beam is 20 cm2 at a distance of 360 cm from the source; the half-angle divergence is less than 10 milliradians. Vacuum techniques have been developed to achieve base pressures in the 10?10 mm Hg range without extensive bakeout procedure. At the same time pumping speeds exceeding 105l/sec for hydrogen are available.A method of trapping the energetic atoms by means of a transient “cold” plasma is also discussed. This procedure greatly increases the initial plasma growth rate. The plasma density attainable depends upon the beam intensity, vacuum, and cold plasma density, the latter two being time-dependent. The generation of a suitable cold plasma is described.

C.C. Damm; A.H. Futch; F. Gordon; A.L. Hunt; E.C. Popp; R.F. Post; J.F. Steinhaus

1961-01-01T23:59:59.000Z

397

Diatom Genome Helps Explain Their Great Diversity and Success in Trapping  

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

5, 2008 5, 2008 Diatom Genome Helps Explain Their Great Diversity and Success in Trapping Excess Carbon in Oceans WALNUT CREEK, CA-Diatoms, mighty microscopic algae, have profound influence on climate, producing 20 percent of the oxygen we breathe by capturing atmospheric carbon and in so doing, countering the greenhouse effect. Since their evolutionary origins these photosynthetic wonders have come to acquire advantageous genes from bacterial, animal and plant ancestors enabling them to thrive in today's oceans. These findings, based on the analysis of the latest sequenced diatom genome, Phaeodactylum tricornutum, are published in 15 October edition of the journal Nature by an international team of researchers led by the U.S. Department of Energy Joint Genome Institute (DOE JGI) and the Ecole Normale Supérieure of

398

A study of back-trap mottle in coated papers using electron probe microanalysis  

SciTech Connect

In this paper methodology is been developed for analyzing both the surface and cross-sectional distributions for coating components using electron probe microanalysis and image analysis technology. Actual light and dark areas of print mottle are physically separated and analyzed to provide an unequivocal relationship between the distribution of coating components and the physical structure of the coating in areas of print mottle. Areas of low ink density were found to have higher surface latex concentration, greater mean coating thickness, and greater mean rawstock roughness. Furthermore, the difference in surface concentration of CaCO{sub 3} within areas of, low and high ink density was established as a new and additional probable cause of back-trap mottle.

Eby, T. (Mead Central Research, Chillicothe, OH (US)); Whalen-Shaw, M.

1991-12-01T23:59:59.000Z

399

February 1, 1994 / Vol. 19, No. 3 / OPTICS LETTERS Spin relaxation of optically trapped atoms by light scattering  

E-Print Network (OSTI)

February 1, 1994 / Vol. 19, No. 3 / OPTICS LETTERS Spin relaxation of optically trapped atoms of optically trapped atoms that is due to light scattering from the trap laser. We observe relaxation times greater than 2 s for ground-state hyperfine-levelpopulations of 85 Rb atoms trapped in an optical dipole

Heinzen, Daniel J.

400

Trace formula for dielectric cavities III: TE modes  

E-Print Network (OSTI)

The construction of the semiclassical trace formula for the resonances with the transverse electric (TE) polarization for two-dimensional dielectric cavities is discussed. Special attention is given to the derivation of the two first terms of Weyl's series for the average number of such resonances. The obtained formulas agree well with numerical calculations for dielectric cavities of different shapes.

E. Bogomolny; R. Dubertrand

2012-06-15T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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

DARK MATTER Tracing the "Cosmic Web" with Diffuse Gas  

E-Print Network (OSTI)

1 DARK MATTER STARS GAS NEUTRAL HYDROGEN Tracing the "Cosmic Web" with Diffuse Gas Quasar Quasar Absorption Lines Keck/HIRES Quasar Spectrum Observer baryons dark matter potential isotropic UV only on and the radiation field intensity... H I #12;5 GOAL: the primordial dark matter power spectrum

Steidel, Chuck

402

Generating and Analyzing Symbolic Traces of Simulink/Stateflow Models  

E-Print Network (OSTI)

of the model and the simulation traces. We propose a new represen­ tation, called the bounded vertex that enables the development, testing, and rapid prototyping of control software, supported by automated code, the semantics of these models is loosely defined in terms of a simulation engine. The lack of clearly specified

Sankaranarayanan, Sriram

403

Learning web-service task descriptions from traces  

Science Journals Connector (OSTI)

This paper considers the problem of learning task specific web-service descriptions from traces of users successfully completing a task. Unlike prior approaches, we take a traditional machine-learning perspective to the construction of web-service models ... Keywords: Apprenticeship Learning, Machine Learning, Sample Complexity, Web Services

Thomas J. Walsh; Michael L. Littman; Alexander Borgida

2012-10-01T23:59:59.000Z

404

GROUP TESTING MEETS TRAITOR TRACING Peter Meerwald and Teddy Furon  

E-Print Network (OSTI)

of the restriction of M to K. Many papers have proposed bounds on the minimal num- ber of tests or practical designs noise (q is the false positive test probability) [2]. Sejdinovic and Johnson recently considered bothGROUP TESTING MEETS TRAITOR TRACING Peter Meerwald and Teddy Furon INRIA Rennes Bretagne Atlantique

Paris-Sud XI, Université de

405

A Feasibility Study: Mining Daily Traces for Home Heating Control  

E-Print Network (OSTI)

savings as well as 14.9%­59.2% reduction in miss time. Keywords Energy, home heating, daily traces, prediction 1. INTRODUCTION Heating, ventilation and cooling (HVAC) contributes most to a home's energy bills, accounting for 48% of residential energy consumption in the U.S. and 61% in the U.K., 64% in Canada where

Whitehouse, Kamin

406

Age of Neoproterozoic Bilatarian Body and Trace Fossils, White  

E-Print Network (OSTI)

Age of Neoproterozoic Bilatarian Body and Trace Fossils, White Sea, Russia: Implications-bearing, shallow marine siliciclastic rocks in the Zimnie Gory section of the White Sea region indicates Ranges, South Australia (18); in the Poleta Formation in the White-Inyo Mountains and Upper Wood Canyon

407

A Parallelisation of Ray Tracing with Diffuse Interreflection Erik Reinhard  

E-Print Network (OSTI)

include a.i. architectural design, theatre and greenhouse lighting simulations and traffic lighting images of 3D scenes. However, the rendering of complex scenes under advanced lighting circumstances may scenes. It calculates the reflection of light in a scene by tracing the path of light backwards from

Reinhard, Erik

408

CACHING CHARACTERISTICS OF INTERNET AND INTRANET WEB PROXY TRACES  

E-Print Network (OSTI)

CACHING CHARACTERISTICS OF INTERNET AND INTRANET WEB PROXY TRACES Arthur Goldberg, Ilya Pevzner} This paper studies the caching characteristics of HTTP requests and responses that pass through production a large Internet Service Provider (ISP) and 2.0 million entries from an Intranet firewall are studied. We

Goldberg, Arthur P.

409

From transformation traces to transformation rules: Assisting Model Driven Engineering  

E-Print Network (OSTI)

From transformation traces to transformation rules: Assisting Model Driven Engineering approach. In this paper we are interested in semi-automatically gen- erating labelled graph (model) transformations conform to a particu- lar syntax (meta-model). Those transformations are basic operations in model driven

Paris-Sud XI, Université de

410

Container throughput estimation leveraging ship GPS traces and open data  

Science Journals Connector (OSTI)

Traditionally, the port container throughput, a crucial measurement of regional economic development, was manually collected by port authorities. This requires a large amount of human effort and often delays publication of this important figure. In this ... Keywords: AIS trace, container throughput estimation, open data

Longbiao Chen, Daqing Zhang, Gang Pan, Leye Wang, Xiaojuan Ma, Chao Chen, Shijian Li

2014-09-01T23:59:59.000Z

411

Method for preconcentrating a sample for subsequent analysis  

DOE Patents (OSTI)

A system for analysis of trace concentration of contaminants in air includes a portable liquid chromatograph and a preconcentrator for the contaminants to be analyzed. The preconcentrator includes a sample bag having an inlet valve and an outlet valve for collecting an air sample. When the sample is collected the sample bag is connected in series with a sorbing apparatus in a recirculation loop. The sorbing apparatus has an inner gas-permeable container containing a sorbent material and an outer gas-impermeable container. The sample is circulated through the outer container and around the inner container for trapping and preconcentrating the contaminants in the sorbent material. The sorbent material may be a liquid having the same composition as the mobile phase of the chromatograph for direct injection thereinto. Alternatively, the sorbent material may be a porous, solid body, to which mobile phase liquid is added after preconcentration of the contaminants for dissolving the contaminants, the liquid solution then being withdrawn for injection into the chromatograph.

Zaromb, Solomon (Hinsdale, IL)

1990-01-01T23:59:59.000Z

412

Heating rates in collisionally opaque alkali-metal atom traps: Role of secondary collisions  

Science Journals Connector (OSTI)

Grazing collisions with background gas are the major cause of trap loss and trap heating in atom traps. To first order, these effects do not depend on the trap density. In collisionally opaque trapped atom clouds, however, scattered atoms with an energy E larger than the effective trap depth Eeff, which are destined to escape from the atom cloud, will have a finite probability for a secondary collision. This results in a contribution to the heating rate that depends on the column density ?nl? of the trapped atoms, i.e., the product of density and characteristic size of the trap. For alkali-metal atom traps, secondary collisions are quite important due to the strong long-range interaction with like atoms. We derive a simple analytical expression for the secondary heating rate, showing a dependency proportional to ?nl??Eeff1/2. When extrapolating to a vanishing column density, only primary collisions with the background gas will contribute to the heating rate. This contribution is rather small, due to the weak long-range interaction of the usual background gas species in an ultrahigh-vacuum system—He, Ne, or Ar—with the trapped alkali-metal atoms. We conclude that the transition between trap-loss collisions and heating collisions is determined by a cutoff energy 200??K<~Eeff<~400??K, much smaller than the actual trap depth E in most magnetic traps. Atoms with an energy Eefftrap temperatures. We present results of secondary heating rates for the alkali-metal atoms Li through Cs as a function of the effective trap depth, the column density of the trap, and the species in the background gas. The predictions of our model are in good agreement with the experimental data of Myatt for heating rates in high-density 87Rb-atom magnetic traps at JILA, including the effect of the rf shield and the composition of the background gas. It is shown that collisions with atoms from the Oort cloud also contribute to the heating rate. For 85Rb the calculated heating rate is below the experimentally observed value at JILA, supporting the idea that inelastic collisions in the trap are the major source of heating.

H. C. W. Beijerinck

2000-11-15T23:59:59.000Z

413

Drunken robber, tipsy cop: First passage times, mobile traps, and Hopf bifurcations  

E-Print Network (OSTI)

For a random walk on a confined one-dimensional domain, we consider mean first passage times (MFPT) in the presence of a mobile trap. The question we address is whether a mobile trap can improve capture times over a stationary trap. We consider two scenarios: a randomly moving trap and an oscillating trap. In both cases, we find that a stationary trap actually performs better (in terms of reducing expected capture time) than a very slowly moving trap; however, a trap moving sufficiently fast performs better than a stationary trap. We explicitly compute the thresholds that separate the two regimes. In addition, we find a surprising relation between the oscillating trap problem and a moving-sink problem that describes reduced dynamics of a single spike in a certain regime of the Gray-Scott model. Namely, the above-mentioned threshold corresponds precisely to a Hopf bifurcation that induces oscillatory motion in the location of the spike. We use this correspondence to prove the uniqueness of the Hopf bifurcation.

Justin C. Tzou; Shuangquan Xie; Theodore Kolokolnikov

2014-10-03T23:59:59.000Z

414

Novel Sorbent-Based Process for High Temperature Trace Metal Removal  

SciTech Connect

The objective of this project was to demonstrate the efficacy of a novel sorbent can effectively remove trace metal contaminants (Hg, As, Se and Cd) from actual coal-derived synthesis gas streams at high temperature (above the dew point of the gas). The performance of TDA's sorbent has been evaluated in several field demonstrations using synthesis gas generated by laboratory and pilot-scale coal gasifiers in a state-of-the-art test skid that houses the absorbent and all auxiliary equipment for monitoring and data logging of critical operating parameters. The test skid was originally designed to treat 10,000 SCFH gas at 250 psig and 350 C, however, because of the limited gas handling capabilities of the test sites, the capacity was downsized to 500 SCFH gas flow. As part of the test program, we carried out four demonstrations at two different sites using the synthesis gas generated by the gasification of various lignites and a bituminous coal. Two of these tests were conducted at the Power Systems Demonstration Facility (PSDF) in Wilsonville, Alabama; a Falkirk (North Dakota) lignite and a high sodium lignite (the PSDF operator Southern Company did not disclose the source of this lignite) were used as the feedstock. We also carried out two other demonstrations in collaboration with the University of North Dakota Energy Environmental Research Center (UNDEERC) using synthesis gas slipstreams generated by the gasification of Sufco (Utah) bituminous coal and Oak Hills (Texas) lignite. In the PSDF tests, we showed successful operation of the test system at the conditions of interest and showed the efficacy of sorbent in removing the mercury from synthesis gas. In Test Campaign No.1, TDA sorbent reduced Hg concentration of the synthesis gas to less than 5 {micro}g/m{sup 3} and achieved over 99% Hg removal efficiency for the entire test duration. Unfortunately, due to the relatively low concentration of the trace metals in the lignite feed and as a result of the intermittent operation of the PSDF gasifier (due to the difficulties in the handling of the low quality lignite), only a small fraction of the sorbent capacity was utilized (we measured a mercury capacity of 3.27 mg/kg, which is only a fraction of the 680 mg/kg Hg capacity measured for the same sorbent used at our bench-scale evaluations at TDA). Post reaction examination of the sorbent by chemical analysis also indicated some removal As and Se (we did not detect any significant amounts of Cd in the synthesis gas or over the sorbent). The tests at UNDEERC was more successful and showed clearly that the TDA sorbent can effectively remove Hg and other trace metals (As and Se) at high temperature. The on-line gas measurements carried out by TDA and UNDEERC separately showed that TDA sorbent can achieve greater than 95% Hg removal efficiency at 260 C ({approx}200g sorbent treated more than 15,000 SCF synthesis gas). Chemical analysis conducted following the tests also showed modest amounts of As and Se accumulation in the sorbent bed (the test durations were still short to show higher capacities to these contaminants). We also evaluated the stability of the sorbent and the fate of mercury (the most volatile and unstable of the trace metal compounds). The Synthetic Ground Water Leaching Procedure Test carried out by an independent environmental laboratory showed that the mercury will remain on the sorbent once the sorbent is disposed. Based on a preliminary engineering and cost analysis, TDA estimated the cost of mercury removal from coal-derived synthesis gas as $2,995/lb (this analysis assumes that this cost also includes the cost of removal of all other trace metal contaminants). The projected cost will result in a small increase (less than 1%) in the cost of energy.

Gokhan Alptekin

2008-09-30T23:59:59.000Z

415

Spin tracking simulations in AGS based on ray-tracing methods - bare lattice, no snakes -  

SciTech Connect

This Note reports on the first simulations of and spin dynamics in the AGS using the ray-tracing code Zgoubi. It includes lattice analysis, comparisons with MAD, DA tracking, numerical calculation of depolarizing resonance strengths and comparisons with analytical models, etc. It also includes details on the setting-up of Zgoubi input data files and on the various numerical methods of concern in and available from Zgoubi. Simulations of crossing and neighboring of spin resonances in AGS ring, bare lattice, without snake, have been performed, in order to assess the capabilities of Zgoubi in that matter, and are reported here. This yields a rather long document. The two main reasons for that are, on the one hand the desire of an extended investigation of the energy span, and on the other hand a thorough comparison of Zgoubi results with analytical models as the 'thin lens' approximation, the weak resonance approximation, and the static case. Section 2 details the working hypothesis : AGS lattice data, formulae used for deriving various resonance related quantities from the ray-tracing based 'numerical experiments', etc. Section 3 gives inventories of the intrinsic and imperfection resonances together with, in a number of cases, the strengths derived from the ray-tracing. Section 4 gives the details of the numerical simulations of resonance crossing, including behavior of various quantities (closed orbit, synchrotron motion, etc.) aimed at controlling that the conditions of particle and spin motions are correct. In a similar manner Section 5 gives the details of the numerical simulations of spin motion in the static case: fixed energy in the neighboring of the resonance. In Section 6, weak resonances are explored, Zgoubi results are compared with the Fresnel integrals model. Section 7 shows the computation of the {rvec n} vector in the AGS lattice and tuning considered. Many details on the numerical conditions as data files etc. are given in the Appendix Section, pages A and sqs.

Meot F.; Ahrens& #44; L.; Glenn& #44; J.; Huang& #44; H.; Luccio& #44; A.; MacKay& #44; W.W.; Roser& #44; T.; Tsoupas& #44; N.

2009-09-01T23:59:59.000Z

416

Zevenhoven & Kilpinen TRACE ELEMENTS, ALKALI METALS 19.6.2001 8-1 Chapter 8 Trace elements,  

E-Print Network (OSTI)

air pollutants), "known or suspected of causing cancer or other serious health effects" (see also, in part stemming from anthropogenic sources, i.e. pollution. In wastes and waste-derived fuels the "trace to fouling of turbine blades (mainly Ca)or pollute or poison catalysts (mainly As) or sorbents downstream

Zevenhoven, Ron

417

Washability of trace elements in product coals from Illinois mines. Technical report, September 1--November 30, 1993  

SciTech Connect

The existing trace element washability data on Illinois coals are based on float-sink methods, and these data are not applicable to modern froth flotation or column flotation processes. Particularly, there is a lack of washability data on samples from modern preparation plants, as well as other product (as-shipped) coals. The goal of this project is to provide the needed trace element washability data on as-shipped coals that were collected during 1992--1993 from Illinois mines. The results generated by this project will promote Illinois coals for such prospective new markets as feed materials for advanced gasification processes, for synthetic organic chemicals, and to meet new environmental requirements for their use in utility steam generation. During the first quarter, each of 34 project samples were ground to about {approximately}100 mesh size and cleaned by use of a special froth flotation technique (release analysis). The flotation products were analyzed for ash, moisture, and heating value (BTU). The data were then used to construct a series of different-washability curves. For example, these curves can show variation in BTU or combustible recovery as a function of the amount of ash or S rejected, or as a function of the weight of the flotation products. From the relationship between %cumulative BTU and %cumulative weight, nine composite samples each having 80% of the total BTU were prepared from the individual flotation products and submitted for trace element analysis.

Demir, I.; Ruch, R.R.; Harvey, R.D.; Steele, J.D. [Illinois Dept. of Energy and Natural Resources, Springfield, IL (United States). Geological Survey

1993-12-31T23:59:59.000Z

418

Trace metal uptake and accumulation pathways in Kemp's ridley sea turtles (Lepidochelys kempii)  

E-Print Network (OSTI)

Little is known of trace metal concentrations and their possible role in the mortality of critically endangered Kemp??s ridley sea turtles (Lepidochelys kempii). Research described herein characterized concentrations of seven trace metals ?? Ag, Cd...

Wang, Hui-Chen

2005-08-29T23:59:59.000Z

419

Trace Reduction for Virtual Memory Simulations Scott F. Kaplan, Yannis Smaragdakis, and Paul R. Wilson  

E-Print Network (OSTI)

Trace Reduction for Virtual Memory Simulations Scott F. Kaplan, Yannis Smaragdakis, and Paul R reduction. Neither requires that the simulator be modi ed to accept the reduced trace. This research

Smaragdakis, Yannis

420

Determination of trace impurities in zircaloy-2 and tellurium by spark source mass spectrometry  

Science Journals Connector (OSTI)

Determination of trace impurities in zircaloy-2 and tellurium by Spark Source Mass Spectrometry (SSMS) is reported. The advantage of SSMS lies in the fact that along with metallic trace constituents even the n...

K. L. Ramakumar; V. A. Raman; V. L. Sant…

1988-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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

Simulation of dust streaming in toroidal traps: Stationary flows  

SciTech Connect

Molecular-dynamic simulations were performed to study dust motion in a toroidal trap under the influence of the ion drag force driven by a Hall motion of the ions in E x B direction, gravity, inter-particle forces, and friction with the neutral gas. This article is focused on the inhomogeneous stationary streaming motion. Depending on the strength of friction, the spontaneous formation of a stationary shock or a spatial bifurcation into a fast flow and a slow vortex flow is observed. In the quiescent streaming region, the particle flow features a shell structure which undergoes a structural phase transition along the flow direction.

Reichstein, Torben; Piel, Alexander [IEAP, Christian-Albrechts-Universitaet, D-24098 Kiel (Germany)

2011-08-15T23:59:59.000Z

422

Nuclear spin qubits in a trapped-ion quantum computer  

E-Print Network (OSTI)

Physical systems must fulfill a number of conditions to qualify as useful quantum bits (qubits) for quantum information processing, including ease of manipulation, long decoherence times, and high fidelity readout operations. Since these conditions are hard to satisfy with a single system, it may be necessary to combine different degrees of freedom. Here we discuss a possible system, based on electronic and nuclear spin degrees of freedom in trapped ions. The nuclear spin yields long decoherence times, while the electronic spin, in a magnetic field gradient, provides efficient manipulation, and the optical transitions of the ions assure a selective and efficient initialization and readout.

M. Feng; Y. Y. Xu; F. Zhou; D. Suter

2009-04-26T23:59:59.000Z

423

Dipole trapped spheromak in a prolate flux conserver  

Science Journals Connector (OSTI)

This paper reports the observation and characterization of a spheromak formed in the Swarthmore Spheromak Experiment (SSX [M. R. Brown Phys. Plasmas6 1717 (1999)]) and trapped in a simple dipole magnetic field. The spheromak is studied in a prolate (tilt unstable) 0.4 m diameter 0.6 m length copper flux conserver in SSX. This plasma does not tilt despite the prolate flux conserver. The spheromak is characterized by a suite of magnetic probe arrays for magnetic structure B ( r t ) ion Doppler spectroscopy for T i and flow and interferometry for n e . Three-dimensional magnetohydrodynamics simulations of this configuration verify its gross sta-bility.

M. R. Brown; C. D. Cothran; J. Fung; M. Chang; J. Horwitz; M. J. Schaffer; J. Leuer; E. V. Belova

2006-01-01T23:59:59.000Z

424

Equilibrium state of a trapped two-dimensional Bose gas  

Science Journals Connector (OSTI)

We study experimentally and numerically the equilibrium density profiles of a trapped two-dimensional Rb87 Bose gas and investigate the equation of state of the homogeneous system using the local density approximation. We find a clear discrepancy between in situ measurements and quantum Monte Carlo simulations, which we attribute to a nonlinear variation of the optical density of the atomic cloud with its spatial density. However, good agreement between experiment and theory is recovered for the density profiles measured after time of flight, taking advantage of their self-similarity in a two-dimensional expansion.

Steffen P. Rath, Tarik Yefsah, Kenneth J. Günter, Marc Cheneau, Rémi Desbuquois, Markus Holzmann, Werner Krauth, and Jean Dalibard

2010-07-12T23:59:59.000Z

425

Prospects for cooling and trapping rotationally hot molecules  

Science Journals Connector (OSTI)

Cold collisions involving highly rotationally excited diatomic molecules are investigated. As the translational energy is lowered, the total inelastic cross section decreases sharply for specific channels where quasiresonant transitions are no longer energetically allowed. Rate coefficients are given for collisional quenching of rotationally excited H2,D2,T2, and O2 at zero temperature. The specific rotational states that are stable against collisional relaxation would be interesting prospects for cooling and trapping. The application of collisional cooling methods together with recently developed schemes for producing rotationally hot molecules may allow high densities of ultracold “super rotors” to be achieved.

R. C. Forrey

2002-08-27T23:59:59.000Z

426

Stabilization of the resistive wall mode instability by trapped energetic particles  

SciTech Connect

A theoretical model for investigating the effect of the trapped energetic particles (EPs) on the resistive wall mode (RWM) instability is proposed. The results demonstrate that the trapped EPs have a dramatic stabilizing effect on the RWM because of resonant interaction between the mode and the magnetic precession drift motion of the trapped EPs. The results also show that the effect of the trapped EPs depends on the wall position. In addition, the stabilizing effect becomes stronger when the plasma rotation is taken into account. For sufficiently fast plasma rotation, the trapped EPs can lead to the complete stabilization of the RWM. Furthermore, the trapped EPs can induce a finite real frequency of the RWM in the absence of plasma rotation.

Hao, G. Z.; Wang, A. K.; Jiang, H. B.; Lu, Gaimin; He, H. D.; Qiu, X. M. [Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041 (China); Liu, Y. Q. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB (United Kingdom)

2011-03-15T23:59:59.000Z

427

Destruction of attractive bosonic cloud due to high spatial coherence in tight trap  

SciTech Connect

We study coherence of a trapped bosonic cloud with attractive finite-range interaction in a tight harmonic trap. One-body density and pair-distribution function in the ground state for different trap sizes are calculated. We also calculate healing length and the correlation length which signify the presence of high spatial coherence in a very tight trap leading to the destruction of the condensate for a fixed particle number. This is in marked variance with the usual collapse of the attractive metastable condensate when N>N{sub cr}. Thus we investigate the critical frequency and critical size of the trap for the existence of attractive Bose-Einstein condensation. The finite-range interaction gives a nonlocal effect in the effective many-body potential, and we observe a high-density stable branch besides the known metastable branch. Moreover, the new branch shows universal behavior even in the very tight trap.

Biswas, Anindya; Das, Tapan Kumar [Department of Physics, University of Calcutta, 92 A.P.C. Road, Kolkata 700009 (India); Chakrabarti, Barnali [Instituto de Fisica, Universidade of Sao Paulo, CP 66318, 05315-970 Sao Paulo-SP (Brazil); Department of Physics, Lady Brabourne College, P1/2 Surawardi Avenue, Kolkata 700017 (India); Salasnich, Luca [Dipartimento di Fisica ''Galileo Galilei'' and CNISM, Universita di Padova, Via Marzolo 8, IT-35122 Padova (Italy)

2011-10-15T23:59:59.000Z

428

An Attack on a TraceZero Cryptosystem Claus Diem and Jasper Scholten  

E-Print Network (OSTI)

An Attack on a Trace­Zero Cryptosystem Claus Diem and Jasper Scholten Institut fË?ur Experimentelle

Diem, Claus

429

Reactive Uptake of Trace Metals in the Hyporheic Zone of a  

E-Print Network (OSTI)

that Mn oxides in the hyporheic zone enhance trace metal uptake. Reach-scale mass-balance calculations

430

The role of trace gas flux networks in biogeosciences  

SciTech Connect

Vast networks of meteorological sensors ring the globe, providing continuous measurements of an array of atmospheric state variables such as temperature, humidity, rainfall, and the concentration of carbon dioxide [New etal., 1999; Tans etal., 1996]. These measurements provide input to weather and climate models and are key to detecting trends in climate, greenhouse gases, and air pollution. Yet to understand how and why these atmospheric state variables vary in time and space, biogeoscientists need to know where, when, and at what rates important gases are flowing between the land and the atmosphere. Tracking trace gas fluxes provides information on plant or microbial metabolism and climate-ecosystem interactions. The existence of trace gas flux networks is a relatively new phenomenon, dating back to research in 1984. The first gas flux measurement networks were regional in scope and were designed to track pollutant gases such as sulfur dioxide, ozone, nitric acid, and nitrogen dioxide. Atmospheric observations and model simulations were used to infer the depositional rates of these hazardous chemicals [Fowler etal., 2009; Meyers etal., 1991]. In the late 1990s, two additional trace gas flux measurement networks emerged. One, the United States Trace Gas Network (TRAGNET), was a short-lived effort that measured trace gas emissions from the soil and plants with chambers distributed throughout the country [Ojima etal., 2000]. The other, FLUXNET, was an international endeavor that brought many regional networks together to measure the fluxes of carbon dioxide, water vapor, and sensible heat exchange with the eddy covariance technique [Baldocchi etal., 2001]. FLUXNET, which remains active today, currently includes more than 400 tower sites, dispersed across most of the world's climatic zones and biomes, with sites in North and South America, Europe, Asia, Africa, and Australia. More recently, several specialized networks have emerged, including networks dedicated to urban areas (Urban Fluxnet), nitrogen compounds in Europe (NitroEurope), and methane (MethaneNet). Technical Aspects of Flux Networks Eddy covariance flux measurements are the preferred method by which biogeoscientists measure trace gas exchange between ecosystems and the atmosphere [Baldocchi, 2003].

Baldocch, Dennis [Department of Environmental Science, Policy and Management, University of California, Berkeley,; Reichstein, Markus [Max Planck Institute for Biogeochemistry; Papale, D. [University of Tuscia; KOTEEN, LAURIE [University of California, Berkeley; VARGAS, RODRIGO [Ensenada Center for Scientific Research and Higher Education (CICESE); Agarwal, D.A [Lawrence Berkeley National Laboratory (LBNL); Cook, Robert B [ORNL

2012-01-01T23:59:59.000Z

431

Fast shuttling of a trapped ion in the presence of noise  

E-Print Network (OSTI)

We theoretically investigate the motional excitation of a single ion caused by spring-constant and position uctuations of a harmonic trap during trap shuttling processes. A detailed study of the sensitivity on noise for several transport protocols and noise spectra is provided. The e?ect of slow spring-constant drifts is also analyzed. Trap trajectories that minimize the excitation are designed combining invariant-based inverse engineering, perturbation theory, and optimal control.

Xiao-Jing Lu; J. G. Muga; Xi Chen; U. G. Poschinger; F. Schmidt-Kaler; A. Ruschhaupt

2014-04-16T23:59:59.000Z

432

Light trapping and near-unity solar absorption in a three-dimensional photonic-crystal  

E-Print Network (OSTI)

Light trapping and near-unity solar absorption in a three-dimensional photonic-crystal Ping Kuang,1 opens up a new door for light trapping and near-unity solar absorption over broad s and wide angles://dx.doi.org/10.1364/OL.38.004200 There is a great deal of interest in efficient light trapping in thin film solar

John, Sajeev

433

Efficient Collection of 221Fr into a Vapor Cell Magneto-optical Trap  

Science Journals Connector (OSTI)

We have efficiently loaded a vapor cell magneto-optical trap from an orthotropic source of 221Fr with a trapping efficiency of 56(10)%. A novel detection scheme allowed us to measure 900 trapped atoms with a signal to noise ratio of ?60 in 1 sec. We have measured the energies and the hyperfine constants of the 7P1/22 and 7P3/22 states.

Z.-T. Lu; K. L. Corwin; K. R. Vogel; C. E. Wieman; T. P. Dinneen; J. Maddi; Harvey Gould

1997-08-11T23:59:59.000Z

434

Trace element geochemical zoning in the Roosevelt Hot Springs thermal area, Utah  

SciTech Connect

Chemical interaction of thermal brines with reservoir rock in the Roosevelt Hot Springs thermal area has resulted in the development of distinctive trace element signatures. Geochemical analysis of soil samples, shallow temperature-gradient drill hole cuttings and deep drill hole cuttings provides a three-dimensional perspective of trace element distributions within the system. Distributions of As, Hg and Li provide the clearest expression of hydrothermal activity. Comparison of these distributions suggests that Li, followed by As and Hg, are progressively deposited by outward flowing, cooling, thermal fluids. Hg, in contrast to As and Li, is distributed only within the outer portions of the thermal system where temperatures are less than about 225/sup 0/C. Heating experiments indicate that extensive Hg remobilization in Roosevelt samples occurs at temperatures as low as 200/sup 0/ to 250/sup 0/C. This suggests that the distribution of Hg largely reflects the present system thermal configuration and that this distribution may be a useful soild geothermometer.

Christensen, O.D.; Moore, J.N.; Capuano, R.M.

1980-09-01T23:59:59.000Z

435

STEIN'S METHOD, HEAT KERNEL, AND TRACES OF POWERS OF ELEMENTS OF COMPACT LIE GROUPS  

E-Print Network (OSTI)

STEIN'S METHOD, HEAT KERNEL, AND TRACES OF POWERS OF ELEMENTS OF COMPACT LIE GROUPS JASON FULMAN Abstract. Combining Stein's method with heat kernel techniques, we show that the trace of the jth power There is a large literature on the traces of powers of random elements of compact Lie groups. One of the earliest

Fulman, Jason

436

STEIN'S METHOD, HEAT KERNEL, AND TRACES OF POWERS OF ELEMENTS OF COMPACT LIE GROUPS  

E-Print Network (OSTI)

STEIN'S METHOD, HEAT KERNEL, AND TRACES OF POWERS OF ELEMENTS OF COMPACT LIE GROUPS JASON FULMAN Abstract. Combining Stein's method with heat kernel techniques, we show that the trace of the jth power on the traces of powers of random elements of compact Lie groups. One of the earliest results is due to Diaconis

Fulman, Jason

437

LES BIG DATA ET LA RELATION CLIENT Quand les traces numriques organisent l'change marchand  

E-Print Network (OSTI)

LES BIG DATA ET LA RELATION CLIENT Quand les traces numériques organisent l'échange marchand Auteur traces numériques organisent l'échange marchand Résumé : Avec le mouvement de digitalisation du commerce marchands font des comportements des consommateurs. Ces traces numériques doivent donc permettre aux

Paris-Sud XI, Université de

438

Microbial acidification and pH effects on trace element release from sewage sludge  

E-Print Network (OSTI)

Microbial acidification and pH effects on trace element release from sewage sludge Shabnam Qureshia; Trace metals; Mobilization; Land application 1. Introduction Trace elements in land-applied wastewater sludge (sewage biosolids) are potentially phyto- or zoo-toxic if present in sufficient concentration

Walter, M.Todd

439

CAN THE GEOCHEMICAL TOPSOIL ATLAS BE USED TO PREDICT TRACE METAL DEFICIENCY IN CATTLE?  

E-Print Network (OSTI)

CAN THE GEOCHEMICAL TOPSOIL ATLAS BE USED TO PREDICT TRACE METAL DEFICIENCY IN CATTLE? By: Emily courtesy LTSN Bioscience. http://bio.ltsn.ac.uk/imagebank/ Just as trace metals are important to humans to the structural stability of molecules and membranes. For these reasons, incorrect trace metal levels can

Nottingham, University of

440

T-R Cycle Characterization and Imaging: Advanced Diagnostic Methodology for Petroleum Reservoir and Trap Detection and Delineation  

SciTech Connect

Characterization of stratigraphic sequences (T-R cycles or sequences) included outcrop studies, well log analysis and seismic reflection interpretation. These studies were performed by researchers at the University of Alabama, Wichita State University and McGill University. The outcrop, well log and seismic characterization studies were used to develop a depositional sequence model, a T-R cycle (sequence) model, and a sequence stratigraphy predictive model. The sequence stratigraphy predictive model developed in this study is based primarily on the modified T-R cycle (sequence) model. The T-R cycle (sequence) model using transgressive and regressive systems tracts and aggrading, backstepping, and infilling intervals or sections was found to be the most appropriate sequence stratigraphy model for the strata in the onshore interior salt basins of the Gulf of Mexico to improve petroleum stratigraphic trap and specific reservoir facies imaging, detection and delineation. The known petroleum reservoirs of the Mississippi Interior and North Louisiana Salt Basins were classified using T-R cycle (sequence) terminology. The transgressive backstepping reservoirs have been the most productive of oil, and the transgressive backstepping and regressive infilling reservoirs have been the most productive of gas. Exploration strategies were formulated using the sequence stratigraphy predictive model and the classification of the known petroleum reservoirs utilizing T-R cycle (sequence) terminology. The well log signatures and seismic reflector patterns were determined to be distinctive for the aggrading, backstepping and infilling sections of the T-R cycle (sequence) and as such, well log and seismic data are useful for recognizing and defining potential reservoir facies. The use of the sequence stratigraphy predictive model, in combination with the knowledge of how the distinctive characteristics of the T-R system tracts and their subdivisions are expressed in well log patterns and seismic reflection configurations and terminations, improves the ability to identify and define the limits of potential stratigraphic traps and the stratigraphic component of combination stratigraphic and structural traps and the associated continental, coastal plain and marine potential reservoir facies. The assessment of the underdeveloped and undiscovered reservoirs and resources in the Mississippi Interior and North Louisiana Salt Basins resulted in the confirmation of the Monroe Uplift as a feature characterized by a major regional unconformity, which serves as a combination stratigraphic and structural trap with a significant stratigraphic component, and the characterization of a developing play in southwest Alabama, which involves a stratigraphic trap, located updip near the pinchout of the potential reservoir facies. Potential undiscovered and underdeveloped reservoirs in the onshore interior salt basins are identified as Jurassic and Cretaceous aggrading continental and coastal, backstepping nearshore marine and marine shelf, and infilling fluvial, deltaic, coastal plain and marine shelf.

Ernest A. Mancini

2006-08-30T23:59:59.000Z

Note: This page contains sample records for the topic "trap trace analysis" 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

A combinatorial method for tracing objects using semantics of their shape.  

SciTech Connect

We present a shape-first approach to finding automobiles and trucks in overhead images and include results from our analysis of an image from the Overhead Imaging Research Dataset [1]. For the OIRDS, our shape-first approach traces candidate vehicle outlines by exploiting knowledge about an overhead image of a vehicle: a vehicle's outline fits into a rectangle, this rectangle is sized to allow vehicles to use local roads, and rectangles from two different vehicles are disjoint. Our shape-first approach can efficiently process high-resolution overhead imaging over wide areas to provide tips and cues for human analysts, or for subsequent automatic processing using machine learning or other analysis based on color, tone, pattern, texture, size, and/or location (shape first). In fact, computationally-intensive complex structural, syntactic, and statistical analysis may be possible when a shape-first work flow sends a list of specific tips and cues down a processing pipeline rather than sending the whole of wide area imaging information. This data flow may fit well when bandwidth is limited between computers delivering ad hoc image exploitation and an imaging sensor. As expected, our early computational experiments find that the shape-first processing stage appears to reliably detect rectangular shapes from vehicles. More intriguing is that our computational experiments with six-inch GSD OIRDS benchmark images show that the shape-first stage can be efficient, and that candidate vehicle locations corresponding to features that do not include vehicles are unlikely to trigger tips and cues. We found that stopping with just the shape-first list of candidate vehicle locations, and then solving a weighted, maximal independent vertex set problem to resolve conflicts among candidate vehicle locations, often correctly traces the vehicles in an OIRDS scene.

Diegert, Carl F.

2010-06-01T23:59:59.000Z

442

E-Print Network 3.0 - antiproton trap hipat Sample Search Results  

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

of - Department of Physics, Non-Neutral Plasma Project Collection: Plasma Physics and Fusion 12 Cold Trapped Positrons and Progress to Cold Antihydrogen Summary: over a wide...

443

Synergies of High-Efficiency Clean Combustion and Lean NOx Trap...  

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

Combustion and Lean NOx Trap Catalysts investigation of potential synergies of low emission advanced combustion techniques and advanced lean exhaust catalytic aftertreatment....

444

Technological assessment of light-trapping technology for thin-film Si solar cell.  

E-Print Network (OSTI)

??The proposed light trapping technology of Distributed Bragg Reflector (DBR) with Diffraction Grating (DG) and Anti-Reflection Coating (ARC) for thin film Si solar cell was… (more)

Susantyoko, Rahmat Agung

2009-01-01T23:59:59.000Z

445

E-Print Network 3.0 - ap-8 trapped proton Sample Search Results  

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

J. Bebek, Armin Karcher, William F. Kolbe, Natalie A. Roe, Summary: Charge trap identification for proton-irradiated p+ channel CCDs Nick J. Mostek, Christopher J... , we...

446

Coherent population trapping on the sodium D1 line in high magnetic fields  

Science Journals Connector (OSTI)

We consider the coherent-population-trapping (CPT) phenomenon in a sodium atomic vapor. The experiment leading to the first observation of CPT is revisited with an improved...

Höller, R; Renzoni, F; Windholz, L; Xu, J H

1997-01-01T23:59:59.000Z

447

Compact, Rapid Cell Deformability Measurements Using Diode Laser Bar Optical Trapping in Microfluidics  

Science Journals Connector (OSTI)

We present a simple, compact, microfluidic system that easily facilitates diode laser bar optical trapping for cell stretching measurements and particle sorting within flowing...

Applegate Jr , Robert W; Squier, Jeff; Vestad, Tor; Oakey, John; Marr, David W

448

Nano-particle trapping by optically induced Dielectrophoresis enhanced by nano-antennas  

Science Journals Connector (OSTI)

We demonstrate experimentally trapping and manipulation of 50nm gold nanoparticles suspended in Isopropanol using dielectrophoretic (DEP) forces induced by illuminating arrays of...

Yifat, Yuval; Eitan, Michal; Scheuer, Jacob

449

E-Print Network 3.0 - aerosol trapping effect Sample Search Results  

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

of this infrared radiation is trapped... 'S TEMPERATURE IS RISING This is the greenhouse effect. Without it, the Earths climate would be ... Source: Brookhaven National...

450

Comparison of methods to quantify interface trap densities at dielectric/IIIV semiconductor interfaces  

E-Print Network (OSTI)

and a series resistance R s . ?c? Equivalent circuit of theresistance, R s . The in- terface trap density contributes an equivalent

Stemmer, Susanne

2010-01-01T23:59:59.000Z

451

QUANTUM SIMULATIONS OF THE ISING MODEL WITH TRAPPED IONS: DEVIL'S STAIRCASE AND ARBITRARY LATTICE PROPOSAL .  

E-Print Network (OSTI)

??A collection of trapped atomic ions represents one of the most attractive platforms for the quantum simulation of interacting spin networks and quantum magnetism. Spin-dependent… (more)

Korenblit, Simcha

2013-01-01T23:59:59.000Z

452

Water Trapping on Tidally Locked Terrestrial Planets Requires Special Conditions  

E-Print Network (OSTI)

Surface liquid water is essential for standard planetary habitability. Calculations of atmospheric circulation on tidally locked planets around M stars suggest that this peculiar orbital configuration lends itself to the trapping of large amounts of water in kilometers-thick ice on the night side, potentially removing all liquid water from the day side where photosynthesis is possible. We study this problem using a global climate model including coupled atmosphere, ocean, land, and sea-ice components as well as a continental ice sheet model driven by the climate model output. For a waterworld we find that surface winds transport sea ice toward the day side and the ocean carries heat toward the night side. As a result, night-side sea ice remains O(10 m) thick and night-side water trapping is insignificant. If a planet has large continents on its night side, they can grow ice sheets O(1000 m) thick if the geothermal heat flux is similar to Earth's or smaller. Planets with a water complement similar to Earth's w...

Yang, Jun; Hu, Yongyun; Abbot, Dorian S

2014-01-01T23:59:59.000Z

453

Dudley Ridge, a geomorphic trap - lacustrine gas in California  

SciTech Connect

The Dudley Ridge gas field is about 6 mi southeast of Kettleman City, California. The abandoned field straddles the boundary between T23S, R19E, and T23S, R20E, MDBM, in Kings County, California. The Tulare Lake depression was formed during the Pleistocene. It is bounded by the Temblor Range on the west, the Sierra Nevada rise on the east, the north tilt of the San Joaquin Valley to the south, and a gentle rise in the San Joaquin Valley floor to the north. The depression is almost circular except for the west side where North Kettleman dome formed a peninsula. The prevailing longshore current was to the south due to Coriolis-directed winds. Dudley Ridge was formed as a spit, trailing south off the side of North Kettleman dome. The spit is sandy, silty clay, with sand lense onlaps. The geomorphic trap formed by the sand lenses serves as a trap for the methane gas being produced in the organic-rich lake-bed sediments.

Sugden, H.E.

1986-04-01T23:59:59.000Z

454

Auxiliary ECR heating system for the gas dynamic trap  

SciTech Connect

Physics aspects of a new system for electron cyclotron resonance heating (ECRH) at the magnetic mirror device Gas Dynamic Trap (GDT, Budker Institute, Novosibirsk) are discussed. This system based on two 400 kW/54.5 GHz gyrotrons is aimed at increasing the electron temperature up to the range 250-350 eV for improved energy confinement of hot ions. The key physical issue of the GDT magnetic field topology is that conventional ECRH geometries are not accessible. The proposed solution is based on a peculiar effect of radiation trapping in inhomogeneous magnetized plasma. Under specific conditions, oblique launch of gyrotron radiation results in generation of right-hand-polarized (R) electromagnetic waves propagating with high N{sub Double-Vertical-Line Double-Vertical-Line} in the vicinity of the cyclotron resonance layer, which leads to effective single-pass absorption of the injected microwave power. In the present paper, we investigate numerically an optimized ECRH scenario based on the proposed mechanism of wave propagation and discuss the design of the ECRH system, which is currently under construction at the Budker Institute.

Shalashov, A. G.; Gospodchikov, E. D.; Smolyakova, O. B.; Malygin, V. I. [Institute of Applied Physics of the Russian Academy of Sciences, Ulyanova St. 46, 603950 Nizhny Novgorod (Russian Federation); Bagryansky, P. A. [Budker Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences, Akademika Lavrentieva Prospect 11, 630090 Novosibirsk (Russian Federation); Thumm, M. [Institut fuer Hochfrequenztechnik und Elektronik, Karlsruhe Institut fuer Technologie, Engesserstrasse 5, 76131 Karlsruhe (Germany)

2012-05-15T23:59:59.000Z

455

Heating of trapped ultracold atoms by collapse dynamics  

E-Print Network (OSTI)

{The Continuous Spontaneous Localization (CSL) theory alters the Schr\\"odinger equation. It describes wave function collapse as a dynamical process instead of an ill-defined postulate, thereby providing macroscopic uniqueness and solving the so-called measurement problem of standard quantum theory. CSL contains a parameter $\\lambda$ giving the collapse rate of an isolated nucleon in a superposition of two spatially separated states and, more generally, characterizing the collapse time for any physical situation. CSL is experimentally testable, since it predicts some behavior different from that predicted by standard quantum theory. One example is the narrowing of wave functions, which results in energy imparted to particles. Here we consider energy given to trapped ultra-cold atoms. Since these are the coldest samples under experimental investigation, it is worth inquiring how they are affected by the CSL heating mechanism. We examine the CSL heating of a BEC in contact with its thermal cloud. Of course, other mechanisms also provide heat and also particle loss. From varied data on optically trapped cesium BEC's, we present an energy audit for known heating and loss mechanisms. The result provides an upper limit on CSL heating and thereby an upper limit on the parameter $\\lambda$. We obtain $\\lambda\\lesssim 1(\\pm1)\\times 10^{-7}$sec$^{-1}$.}

Franck Laloë; William J. Mullin; Philip Pearle

2014-11-12T23:59:59.000Z

456

Tracing And Quantifying Magmatic Carbon Discharge In Cold Groundwaters-  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Tracing And Quantifying Magmatic Carbon Discharge In Cold Groundwaters- Lessons Learned From Mammoth Mountain, Usa Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Tracing And Quantifying Magmatic Carbon Discharge In Cold Groundwaters- Lessons Learned From Mammoth Mountain, Usa Details Activities (3) Areas (1) Regions (0) Abstract: A major campaign to quantify the magmatic carbon discharge in cold groundwaters around Mammoth Mountain volcano in eastern California was carried out from 1996 to 1999. The total water flow from all sampled cold springs was >=1.8_107 m3/yr draining an area that receives an estimated

457

Fault simulation of combinational circuits based on critical path tracing  

E-Print Network (OSTI)

FAULT SIMULATION Ol' COMBINATIONAI, CIRCUITS BASED ON CRITICAL PATH TRACING A Thesis by CHARLES JAMES BURNETT Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE December 1992 Major Subject: Electrical Engineering FAULT SIIUIULATION OF COMBINATlONAL CIRCUITS BASED ON CRITICAL PATH TRACINC A Thesis CHARLES JAMES BURNETT Approved as to style and content by: Don E. Ross (Chair of Committee...

Burnett, Charles James

1992-01-01T23:59:59.000Z

458

An Analysis of Surface and Subsurface Lineaments and Fractures for Oil and Gas Exploration in the Mid-Continent Region  

SciTech Connect

An extensive literature search was conducted and geological and mathematical analyses were performed to investigate the significance of using surface lineaments and fractures for delineating oil and gas reservoirs in the Mid-Continent region. Tremendous amount of data were acquired including surface lineaments, surface major fracture zones, surface fracture traces, gravity and magnetic lineaments, and Precambrian basement fault systems. An orientation analysis of these surface and subsurface linear features was performed to detect the basic structural grains of the region. The correlation between surface linear features and subsurface oil and gas traps was assessed, and the implication of using surface lineament and fracture analysis for delineating hydrocarbon reservoirs in the Mid-Continent region discussed. It was observed that the surface linear features were extremely consistent in orientation with the gravity and magnetic lineaments and the basement faults in the Mid-Continent region. They all consist of two major sets bending northeast and northwest, representing, therefore, the basic structural grains of the region. This consistency in orientation between the surface and subsurface linear features suggests that the systematic fault systems at the basement in the Mid-Continent region have probably been reactivated many times and have propagated upward all the way to the surface. They may have acted as the loci for the development of other geological structures, including oil and gas traps. Also observed was a strong association both in orientation and position between the surface linear features and the subsurface reservoirs in various parts of the region. As a result, surface lineament and fracture analysis can be used for delineating additional oil and gas reserves in the Mid-Continent region. The results presented in this paper prove the validity and indicate the significance of using surface linear features for inferring subsurface oil and gas reservoirs in the Mid-Continent region. Any new potential oil and gas reservoirs in the Mid-Continent region, if they exist, will be likely associated with the northeast- and northwest-trending surface lineaments and fracture traces in the region.

Guo, Genliang; and George, S.A.

1999-04-08T23:59:59.000Z

459

Ion Crystals Produced by Laser and Sympathetic Cooling in a Linear RF Ion Trap  

E-Print Network (OSTI)

A detailed investigation of ion crystals produced by laser and sympathetic cooling in a linear RF trap has been conducted. The laser cooling methods were examined and applied to the trapped ^24Mg^(positive) ions. The crystals produced by the laser...

Zhu, Feng

2012-02-14T23:59:59.000Z

460

Laser Stabilization for Quantum Computing with Trapped Barium ions Corey Adams  

E-Print Network (OSTI)

Laser Stabilization for Quantum Computing with Trapped Barium ions Corey Adams University of Rochester (Dated: November 11, 2009) ABSTRACT The goal of this project was to stabilize a laser cooling system used to trap and cool Ba+ ions used for quantum computation research. The lasers, at 650 and 985

Blinov, Boris

Note: This page contains sample records for the topic "trap trace analysis" 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

ccsd00000593 Collective modes of a trapped Lieb-Liniger gas  

E-Print Network (OSTI)

ccsd­00000593 (version 1) : 11 Sep 2003 Collective modes of a trapped Lieb-Liniger gas September 11, 2003) We consider a trapped repulsive one-dimensional (1D) Bose gas at very low temperature, where the gas is locally described by the Lieb-Liniger model of bosons interacting via a repulsive delta

462

Surface-Enhanced Raman Scattering with Ag Nanoparticles Optically Trapped by a Photonic Crystal Cavity  

E-Print Network (OSTI)

on the chemical to be sensed. Figure 1a shows a schematic diagram of the trapping-assisted SERS platform we) platform by optically trapping Ag nanoparticles with a photonic crystal cavity integrated, unattended systems for the continual monitoring of chemicals in air and water. A high- performance substrate

463

Trapped-particle diocotron modes T. J. Hilsabeck and T. M. O'Neil  

E-Print Network (OSTI)

Trapped-particle diocotron modes T. J. Hilsabeck and T. M. O'Neil Department of Physics, University rate, and eigenmode structure are compared to experimental observation. The modes are excited on a non-neutral plasma column in which classes of trapped and passing particles have been created by the application

California at San Diego, University of

464

MATERIALS, METHODS, AND INSTRUMENTATION FOR PREPARATIVE-SCALE ISOELECTRIC TRAPPING SEPARATIONS  

E-Print Network (OSTI)

MATERIALS, METHODS, AND INSTRUMENTATION FOR PREPARATIVE- SCALE ISOELECTRIC TRAPPING SEPARATIONS A Dissertation by ROBERT YATES NORTH Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of DOCTOR OF PHILOSOPHY May 2009 Major Subject: Chemistry MATERIALS, METHODS, AND INSTRUMENTATION FOR PREPARATIVE- SCALE ISOELECTRIC TRAPPING SEPARATIONS A Dissertation by ROBERT YATES NORTH...

North, Robert Yates

2011-08-08T23:59:59.000Z

465

NEUTRON LIFETIME EXPERIMENT USING UCN STORAGE IN AN `ACCORDION-LIKE' TRAP  

E-Print Network (OSTI)

NEUTRON LIFETIME EXPERIMENT USING UCN STORAGE IN AN `ACCORDION-LIKE' TRAP BY ASHISH M. DESAI determination of the neutron lifetime has an impact on particle physics and cosmology. We report progress towards a measurement of the neutron lifetime using an accordion-like storage trap. Ultracold neutrons

Steyerl, Albert

466

M4C3 precipitation in FeCMoV steels and relationship to hydrogen trapping  

E-Print Network (OSTI)

, Pembroke Street, Cambridge CB2 3QZ, UK Strong steels suffer from embrittlement due to dissolved hydrogenM4C3 precipitation in Fe­C­Mo­V steels and relationship to hydrogen trapping BY S. YAMASAKI AND H, a phenomenon which can be mitigated by trapping the hydrogen at carbide particles, where it is rendered benign

Cambridge, University of

467

Video Article A Microfluidic-based Hydrodynamic Trap for Single Particles  

E-Print Network (OSTI)

Video Article A Microfluidic-based Hydrodynamic Trap for Single Particles Eric M. Johnson). A Microfluidic-based Hydrodynamic Trap for Single Particles. JoVE. 47. http://www.jove.com/details.php?id=2517 and biology ranging from the molecular to cellular level. In this article, we introduce a new microfluidic

Schroeder, Charles

468

Trapping cold atoms using surface-grown carbon nanotubes P. G. Petrov,1,* S. Machluf,1  

E-Print Network (OSTI)

Trapping cold atoms using surface-grown carbon nanotubes P. G. Petrov,1,* S. Machluf,1 S. Younis,1 atomic clouds into magnetic traps created by single-wall carbon nanotubes grown directly onto dielectric surfaces. We show that atoms may be captured for experimen- tally sustainable nanotube currents, generating

Joselevich, Ernesto

469

Optica Applicata Vol. XXVIII, No. 3, str. 239, 1998 Magneto-Optical Trap for Rubidium Atoms  

E-Print Network (OSTI)

1 Optica Applicata Vol. XXVIII, No. 3, str. 239, 1998 Magneto-Optical Trap for Rubidium Atoms Jerzy of the lasers used in the set-up. 1. Introduction Atomic physics has noticed recently a rapid development of research on different methods of cooling and trapping of atoms with use of optical forces (light pressure

470

Cooling and Trapping Atoms Atoms are slowed and cooled by radiation pressure from laser light  

E-Print Network (OSTI)

Cooling and Trapping Atoms Atoms are slowed and cooled by radiation pressure from laser light and then trapped in a bottle whose "walls" are magnetic fields. Cooled atoms are ideal for exploring basic. research has traditionally been the study of the intrinsic prop erties of isolated atoms. In the early part

Johannesson, Henrik

471

VOLUME 6S, NUMBER 13 PHYSICAL REVIEW LETTERS Very Cold Trapped Atoms in a Vapor Cell  

E-Print Network (OSTI)

VOLUME 6S, NUMBER 13 PHYSICAL REVIEW LETTERS Very Cold Trapped Atoms in a Vapor Cell 24 SEPTEMBER sample of spin-polarized trapped atoms. The technique used dramati- cally simplifies the production of laser-cooled atoms. In this experiment, 1.8x10' neutral cesium atoms were optically captured directly

Monroe, Christopher

472

Cooling and Heating of the Quantum Motion of Trapped Cd+ Louis Deslauriers  

E-Print Network (OSTI)

of fluctuating electric fields with the motional state of the ion leads to heating and thus to decoherence of decoherence in ion traps and possibly other charge-based quantum systems. #12;Cooling and HeatingABSTRACT Cooling and Heating of the Quantum Motion of Trapped Cd+ Ions by Louis Deslauriers Chair

Monroe, Christopher

473

Trapping of ultracold atoms in a hollow-core photonic crystal fiber Caleb A. Christensen,1  

E-Print Network (OSTI)

light in multiple modes in the cladding or core. Such fibers are susceptible to speckle or inhomogeneous have succeeded in trapping ultracold atoms 13 or guiding thermal 14 or laser-cooled atoms 15 through laser cooling and rf evaporation in a dc Ioffe-Pritchard magnetic trap, then load the BEC into a red

474

The trapped-particle instability in the Boeing 1kW FEL oscillator  

SciTech Connect

The new design for the Boeing High Average Power Free Electron Laser will operate at 1KW average power (0.63 {mu}m) with a peak current of 132A. Simulations are used to investigate the trapped-particle instability and diffraction effects. Incorporating large desynchronism may prove to be a useful method of controlling the trapped-particle instability.

Ramos, L.; Blau, J.; Colson, W.B. [Naval Postgraduate School, Monterey, CA (United States)

1995-12-31T23:59:59.000Z

475

Oscillating Magnetic Trap and Non-Thermal Emission from Solar Flares  

Science Journals Connector (OSTI)

......connected with the electron thermal conductivity and ion viscosity...1, ed. Galeev A. A., Sudan R. N. (North-Holland Physics...Oscillating Magnetic Trap and Non-Thermal Emission from Solar Flares...scattering of trapped non-thermal electrons (Aschwanden et al......

Yuri Tsap; Yulia Kopylova; Tatiana Goldvarg; Alexander Stepanov

2013-12-05T23:59:59.000Z

476

Ground state cooling, quantum state engineering and study of decoherence of ions in Paul traps  

E-Print Network (OSTI)

Ground state cooling, quantum state engineering and study of decoherence of ions in Paul traps F March 2000; revision received 23 June 2000) Abstract. We investigate single ions of 40 Ca in Paul traps for the manipulation of the ion' s quantum state. We apply sideband cooling to the ion and reach the ground state

Blatt, Rainer

477

Fundamental limit of light trapping in grating Zongfu Yu, Aaswath Raman and Shanhui Fan+  

E-Print Network (OSTI)

­305 (1982). 5. M. A. Green, "Lambertian light trapping in textured solar cells and light-emitting diodes. I. Tobías, A. Luque, and A. Marti, "Light intensity enhancement by diffracting structures in solar of nanophotonic light trapping for solar cells," arXiv:1004.2902v2 [physics.optics] (2010). http

Fan, Shanhui

478

Silicon Solar Cell Light-Trapping Using Defect Mode Photonic Kelsey A. Whitesell*a  

E-Print Network (OSTI)

Silicon Solar Cell Light-Trapping Using Defect Mode Photonic Crystals Kelsey A. Whitesell to enhance performance of thin film solar cells because of their unique ability to control light. We show for light trapping in thin film photovoltaics. Keywords: photonic crystals, defect, silicon, solar cell

Atwater, Harry

479

Light Trapping Textures Designed by Electromagnetic Optimization for Sub-Wavelength Thick Solar Cells  

E-Print Network (OSTI)

Light Trapping Textures Designed by Electromagnetic Optimization for Sub-Wavelength Thick Solar Sciences Division, Lawrence Berkeley National Laboratory July 23, 2013 Abstract Light trapping in solar the surface of the solar cell, where n is the material refractive index. This ray-optics absorption

California at Irvine, University of

480

Light trapping design for low band-gap polymer solar cells  

E-Print Network (OSTI)

Light trapping design for low band-gap polymer solar cells Stephen Foster1,* and Sajeev John1,2 1 demonstrate numerically a 2-D nanostructured design for light trapping in a low band-gap polymer solar cell, "Light harvesting improvement of organic solar cells with self- enhanced active layer designs," Opt

John, Sajeev

Note: This page contains sample records for the topic "trap trace analysis" 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.


481

3D modeling of magnetic atom traps on type-II superconductor chips  

E-Print Network (OSTI)

Israel 2 A. Yersin Department of Solar Energy and Environmental Physics, The Blaustein Institutes. The proposed approach allows us to predict important characteristics of the magnetic traps (their depth, shape, and in the usage of trapped atoms to probe local irregularities of magnetic and electric fields near conductive

Prigozhin, Leonid

482

Optical diagnostics of cold (I'mK atoms in the magneto-optical trap  

E-Print Network (OSTI)

Optical diagnostics of cold (I'mK atoms in the magneto-optical trap Tomasz M. Brzozowski, Witold with the spectroscopic methods. In this paper, we present basic principles ofobtaining ultra-cold atoms and methods used-OFHCAL TRAP Temperatures of atoms in gaseous phase below 1 mK are nowadays routinely reached with the help

483

NREL experiments show that disordered inverse opals significantly scatter and trap near-infrared light, with  

E-Print Network (OSTI)

NREL experiments show that disordered inverse opals significantly scatter and trap near-infrared wavelengths in the near-infrared (NIR), which is important to a number of technologies. This discovery.neale@nrel.gov Reference: N.R. Neale, B.G. Lee, S.H. Kang, and A.J. Frank."Near-Infrared Light Trapping in Disordered

484

Title of dissertation: QUANTUM SIMULATIONS OF THE ISING MODEL WITH TRAPPED IONS  

E-Print Network (OSTI)

are intractable. #12;QUANTUM SIMULATIONS OF THE ISING MODEL WITH TRAPPED IONS: DEVIL'S STAIRCASE AND ARBITRARYABSTRACT Title of dissertation: QUANTUM SIMULATIONS OF THE ISING MODEL WITH TRAPPED IONS: DEVIL'S STAIRCASE AND ARBITRARY LATTICE PROPOSAL Simcha Korenblit, Doctor of Philosophy 2013 Dissertation directed

Monroe, Christopher

485

Light traps are one of a number of different gears used to sample  

E-Print Network (OSTI)

phases, current speed or water Effects of current speed and turbidity on stationary light-trap catches measurements of cur- rent speed and turbidity. Materials and methods Study sites Larval and juvenile fishes438 Light traps are one of a number of different gears used to sample pelagic larval and juvenile

486

Steven Chu: Laser Cooling and Trapping of Atoms  

Office of Scientific and Technical Information (OSTI)

Steven Chu Steven Chu Laser Cooling and Trapping of Atoms Resources with Additional Information · Interviews, Speeches, and Presentations · Patents Steven Chu Photo Credit: Lawrence Berkeley National Laboratory Roy Kaltschmidt, Photographer Steven Chu was appointed by President Barack Obama to be the 12th Secretary of Energy and served in this capacity until April 22, 2013. He was previously Director of Lawrence Berkeley National Laboratory (LBNL), Professor in the Physics Department at the University of California, Berkeley, and 'the Theodore and Frances Geballe Professor of Physics and Applied Physics at Stanford University. Professor Chu's research is in atomic physics, polymer and biophysics. His thesis and postdoctoral work at Berkeley ... was the observation of parity non-conservation in atomic transitions in 1978. This experiment was one of the earliest atomic physics confirmations of the Weinberg-Salam-Glashow theory that unifies the weak and electromagnetic forces.

487

Steven Chu: Laser Cooling and Trapping of Atoms  

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

Steven Chu Steven Chu Laser Cooling and Trapping of Atoms Resources with Additional Information · Interviews, Speeches, and Presentations · Patents Steven Chu Photo Credit: Lawrence Berkeley National Laboratory Roy Kaltschmidt, Photographer Steven Chu was appointed by President Barack Obama to be the 12th Secretary of Energy and served in this capacity until April 22, 2013. He was previously Director of Lawrence Berkeley National Laboratory (LBNL), Professor in the Physics Department at the University of California, Berkeley, and 'the Theodore and Frances Geballe Professor of Physics and Applied Physics at Stanford University. Professor Chu's research is in atomic physics, polymer and biophysics. His thesis and postdoctoral work at Berkeley ... was the observation of parity non-conservation in atomic transitions in 1978. This experiment was one of the earliest atomic physics confirmations of the Weinberg-Salam-Glashow theory that unifies the weak and electromagnetic forces.

488

Laser cooling of a trapped particle with increased Rabi frequencies  

E-Print Network (OSTI)

This paper analyses the cooling of a single particle in a harmonic trap with red-detuned laser light with fewer approximations than previously done in the literature. We avoid the adiabatic elimination of the excited atomic state but are still interested in Lamb-Dicke parameters $\\eta \\ll 1$. Our results show that the Rabi frequency of the cooling laser can be chosen higher than previously assumed, thereby increasing the effective cooling rate but {\\em not} affecting the final outcome of the cooling process. Since laser cooling is already a well established experimental technique, the main aim of this paper is to present a model which can be extended to more complex scenarios, like cavity-mediated laser cooling.

Tony Blake; Andreas Kurcz; Norah S. Saleem; Almut Beige

2011-10-14T23:59:59.000Z

489

Subwavelength edge detection through trapped resonances in waveguides  

E-Print Network (OSTI)

Lenses that can collect the perfect image of an object must restore propagative and evanescent waves. However, for efficient information transfer, e.g., in compressed sensing, it is often desirable to detect only the fast spatial variations of the wave field (carried by evanescent waves), as the one created by edges or small details. Image processing edge detection algorithms perform such operation but they add time and complexity to the imaging process. Here, we present a new subwavelength approach that generates an image of only those components of the acoustic field that are equal to or smaller than the operating wavelength. The proposed technique converts evanescent waves into propagative waves exciting trapped resonances in a waveguide, and it uses periodicity to attenuate the propagative components. This approach achieves resolutions about an order of magnitude smaller than the operating wavelength and makes it possible to visualize independently edges aligned along different directions.

Molerón, Miguel

2015-01-01T23:59:59.000Z

490

Trapping and aerogelation of nanoparticles in negative gravity hydrocarbon flames  

SciTech Connect

We report the experimental realization of continuous carbon aerogel production using a flame aerosol reactor by operating it in negative gravity (?g; up-side-down configuration). Buoyancy opposes the fuel and air flow forces in ?g, which eliminates convectional outflow of nanoparticles from the flame and traps them in a distinctive non-tipping, flicker-free, cylindrical flame body, where they grow to millimeter-size aerogel particles and gravitationally fall out. Computational fluid dynamics simulations show that a closed-loop recirculation zone is set up in ?g flames, which reduces the time to gel for nanoparticles by ?10{sup 6}?s, compared to positive gravity (upward rising) flames. Our results open up new possibilities of one-step gas-phase synthesis of a wide variety of aerogels on an industrial scale.

Chakrabarty, Rajan K., E-mail: rajan.chakrabarty@gmail.com [Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130 (United States); Laboratory for Aerosol Science, Spectroscopy, and Optics, Desert Research Institute, Nevada System of Higher Education, Reno, Nevada 89512 (United States); Novosselov, Igor V. [Department of Mechanical Engineering, University of Washington, Seattle, Washington 98195 (United States); Enertechnix Inc., Maple Valley, Washington 98068 (United States); Beres, Nicholas D.; Moosmüller, Hans [Laboratory for Aerosol Science, Spectroscopy, and Optics, Desert Research Institute, Nevada System of Higher Education, Reno, Nevada 89512 (United States); Sorensen, Christopher M. [Condensed Matter Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506 (United States); Stipe, Christopher B. [TSI Incorporated, 500 Cardigan Rd, Shoreview, Minnesota 55126 (United States)

2014-06-16T23:59:59.000Z

491

Hydrogen trapping in ?-Pu: insights from electronic structure calculations  

Science Journals Connector (OSTI)

Density functional theory calculations have been performed to provide details of the structural and charge-transfer details related to the solid solution of hydrogen in (?)-plutonium. We follow the Flanagan model that outlines the process by which hydrogen interacts with a metal to produce hydride phases, via a sequence of surface, interstitial and defect-bound (trapped) states. Due to the complexities of the electronic structure in plutonium solid-state systems, we take the pragmatic approach of adopting the 'special quasirandom structure' to disperse the atomic magnetic moments. We find that this approach produces sound structural and thermodynamic properties in agreement with the available experimental data. In ?-Pu, hydrogen has an exothermic binding energy to all of the states relevant in the Flanagan model, and, furthermore, is anionic in all these states. The charge transfer is maximized (i.e. most negative for hydrogen) in the hydride phase. The pathway from surface to hydride is sequentially exothermic, in the order surface

Christopher D Taylor; Sarah C Hernandez; Michael F Francis; Daniel S Schwartz; Asok K Ray

2013-01-01T23:59:59.000Z

492

Theory of indirect exciton photoluminescence in elevated quantum trap  

Science Journals Connector (OSTI)

Abstract Inspired by an experiment of indirect excitons photoluminescence (PL) in elevated quantum trap (High et al., 2009), we theoretically investigate the energy relaxation and nonlinear interactions of indirect excitons in coupled quantum wells. It is shown that, when increasing the laser power, the intensity reversion of two PL peaks is due to the phonon necklace effect. In addition, we use a nonlinear Schrödinger equation including attractive two-body, repulsive three-body interactions and the excitation power dependence of energy distribution to understand the exciton states. This model gives a natural account for the PL blue shift with the increase of the excitation power. This study thus provides an alternative way to understand the underlying physics of the exciton dynamics in coupled potential wells.

C.S. Liu; T.F. Xu; Y.H. Liu; X.L. Jing

2014-01-01T23:59:59.000Z

493

Nuclear spin cooling using Overhauser field selective coherent population trapping  

E-Print Network (OSTI)

Hyperfine interactions with a nuclear spin environment fundamentally limit the coherence properties of confined electron spins in the solid-state. Here, we show that a quantum interference effect in optical absorption from two electronic spin states of a solid-state emitter can be used to prepare the surrounding environment of nuclear spins in well-defined states, thereby suppressing electronic spin dephasing. The evolution of the coupled electron-nuclei system into a coherent population trapping state by optical excitation induced nuclear spin diffusion can be described in terms of Levy flights, in close analogy with sub-recoil laser cooling of atoms. The large difference in electronic and nuclear time scales simultaneously allow for a measurement of the magnetic field produced by nuclear spins, making it possible to turn the lasers that cause the anomalous spin diffusion process off when the strength of the resonance fluorescence reveals that the nuclear spins are in the desired narrow state.

Mena Issler; Eric Kessler; Geza Giedke; Susanne Yelin; Ignacio Cirac; Mikhail Lukin; Atac Imamoglu

2010-08-20T23:59:59.000Z

494

Lean Gasoline Engine Reductant Chemistry During Lean NOx Trap Regeneration  

SciTech Connect

Lean NOx Trap (LNT) catalysts can effectively reduce NOx from lean engine exhaust. Significant research for LNTs in diesel engine applications has been performed and has led to commercialization of the technology. For lean gasoline engine applications, advanced direct injection engines have led to a renewed interest in the potential for lean gasoline vehicles and, thereby, a renewed demand for lean NOx control. To understand the gasoline-based reductant chemistry during regeneration, a BMW lean gasoline vehicle has been studied on a chassis dynamometer. Exhaust samples were collected and analyzed for key reductant species such as H2, CO, NH3, and hydrocarbons during transient drive cycles. The relation of the reductant species to LNT performance will be discussed. Furthermore, the challenges of NOx storage in the lean gasoline application are reviewed.

Choi, Jae-Soon [ORNL] [ORNL; Prikhodko, Vitaly Y [ORNL] [ORNL; Partridge Jr, William P [ORNL] [ORNL; Parks, II, James E [ORNL; Norman, Kevin M [ORNL] [ORNL; Huff, Shean P [ORNL] [ORNL; Chambon, Paul H [ORNL] [ORNL; Thomas, John F [ORNL] [ORNL

2010-01-01T23:59:59.000Z

495

Penning traps with unitary architecture for storage of highly charged ions  

E-Print Network (OSTI)

Penning traps are made extremely compact by embedding rare-earth permanent magnets in the electrode structure. Axially-oriented NdFeB magnets are used in unitary architectures that couple the electric and magnetic components into an integrated structure. We have constructed a two- magnet Penning trap with radial access to enable the use of laser or atomic beams, as well as the collection of light. An experimental apparatus equipped with ion optics is installed at the NIST electron beam ion trap (EBIT) facility, constrained to fit within 1 meter at the end of a horizontal beamline for transporting highly charged ions. Highly charged ions of neon and argon, extracted with initial energies up to 4000 eV per unit charge, are captured and stored to study the confinement properties of a one-magnet trap and a two-magnet trap. Design considerations and some test results are discussed.

Tan, Joseph N; Guise, Nicholas D; 10.1063/1.3685246

2012-01-01T23:59:59.000Z

496

Noise and microresonance of critical current in Josephson junction induced by Kondo trap states  

E-Print Network (OSTI)

We analyze the impact of trap states in the oxide layer of a superconducting tunnel junctions, on the fluctuation of the Josephson critical current, thus on coherence in superconducting qubits. Two mechanisms are usually considered: the current blockage due to repulsion at the occupied trap states, and the noise from electrons hopping across a trap. We extend previous studies of noninteracting traps to the case where the traps have on-site electron repulsion inside one ballistic channel. The repulsion not only allows the appropriate temperature dependence of 1/f noise, but also is a control to the coupling between the computational qubit and the spurious two-level systems inside the oxide dielectric. We use second order perturbation theory which allows to obtain analytical formulae for the interacting bound states and spectral weights, limited to small and intermediate repulsions. Remarkably, it still reproduces the main features of the model as identified from the Numerical Renormalization Group. We present ...

Ansari, Mohammad H

2011-01-01T23:59:59.000Z

497

Adiabatic electron response and solitary wave generation by trapped particle nonlinearity in a hydrogen plasma  

SciTech Connect

The finite amplitude ion acoustic waves that trap electrons modify the structure of the evolving nonlinear soliton solutions. In the numerical simulations, self-consistently generated solitary waves are studied that emerge as a result of a current driven microinstability growing the ion acoustic mode in a collisionless Vlasov plasma. The growth saturates as a result of nonlinear effects governed by a combination of nonlinearities originating from the hydrodynamic model and kinetic particle trapping effects. The resulting solitary waves also coexist with a finite current and an electron plasma wave capable of perturbing the trapping potential. The results of multiscale simulation are analyzed and characterized following the kinetic prescription of undamped trapped particle mode in the form of phase space vortex solutions that are generalized form of Sagdeev's solitons and obey the solutions of a modified Korteweg-de Vries equation, accounting for a stronger nonlinearity originating from the electron trapping.

Mandal, Debraj; Sharma, Devendra [Institute for Plasma Research, Bhat, Gandhinagar 382428 (India)

2014-10-15T23:59:59.000Z

498

Accuracy estimations of overtone vibrational transition frequencies of optically trapped 174Yb6Li molecules  

Science Journals Connector (OSTI)

The attainable accuracy of the X2?(v,N)=(0,0)?(vu,0) transition frequencies of optically trapped 174Yb6Li molecules are analyzed (vu=1,2,3,4) to test the variation in the proton-to-electron mass ratio. We eliminate the Stark shifts induced by the trap and Raman lasers by choosing appropriate frequencies (magic frequencies). For vu=1 and 2, we obtain more than one experimentally useful magic frequency, thereby leading to more choice in the trap laser. For vu=3 and 4, the choice in the trap laser is limited. The systematic frequency uncertainty is given by the trap laser frequency detuning from the magic frequency and the fluctuation of the power ratio of the two Raman lasers and can be lower than 10?16 for all these transition frequencies. To obtain lower statistical uncertainty, measurement with vu=4 is more advantageous than that with vu=1?3.

Masatoshi Kajita; Geetha Gopakumar; Minori Abe; Masahiko Hada

2012-06-28T23:59:59.000Z

499

Hybrid particle traps and conditioning procedure for gas insulated transmission lines  

DOE Patents (OSTI)

A gas insulated transmission line includes an outer sheath, an inner condor within the outer sheath, insulating supports supporting the inner conductor within the outer sheath, and an insulating gas electrically insulating the inner conductor from the outer sheath. An apertured particle trapping ring is disposed within the outer sheath, and the trapping ring has a pair of dielectric members secured at each longitudinal end thereof, with the dielectric members extending outwardly from the trapping ring along an arc. A support sheet having an adhesive coating thereon is secured to the trapping ring and disposed on the outer sheath within the low field region formed between the trapping ring and the outer sheath. A conditioning method used to condition the transmission line prior to activation in service comprises applying an AC voltage to the inner conductor in a plurality of voltage-time steps, with the voltage-time steps increasing in voltage magnitude while decreasing in time duration.

Dale, Steinar J. (Monroeville, PA); Cookson, Alan H. (Churchill, PA)

1982-01-01T23:59:59.000Z

500

Contamination analysis unit  

DOE Patents (OSTI)

The portable Contamination Analysis Unit (CAU) measures trace quantifies of surface contamination in real time. The detector head of the portable contamination analysis unit has an opening with an O-ring seal, one or more vacuum valves and a small mass spectrometer. With the valve closed, the mass spectrometer is evacuated with one or more pumps. The O-ring seal is placed against a surface to be tested and the vacuum valve is opened. Data is collected from the mass spectrometer and a portable computer provides contamination analysis. The CAU can be used to decontaminate and decommission hazardous and radioactive surface by measuring residual hazardous surface contamination, such as tritium and trace organics It provides surface contamination data for research and development applications as well as real-time process control feedback for industrial cleaning operations and can be used to determine the readiness of a surface to accept bonding or coatings.

Gregg, Hugh R. (Livermore, CA); Meltzer, Michael P. (Livermore, CA)

1996-01-01T23:59:59.000Z