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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.


1

Method of estimating pulse response using an impedance spectrum  

DOE Patents [OSTI]

Electrochemical Impedance Spectrum data are used to predict pulse performance of an energy storage device. The impedance spectrum may be obtained in-situ. A simulation waveform includes a pulse wave with a period greater than or equal to the lowest frequency used in the impedance measurement. Fourier series coefficients of the pulse train can be obtained. The number of harmonic constituents in the Fourier series are selected so as to appropriately resolve the response, but the maximum frequency should be less than or equal to the highest frequency used in the impedance measurement. Using a current pulse as an example, the Fourier coefficients of the pulse are multiplied by the impedance spectrum at corresponding frequencies to obtain Fourier coefficients of the voltage response to the desired pulse. The Fourier coefficients of the response are then summed and reassembled to obtain the overall time domain estimate of the voltage using the Fourier series analysis.

Morrison, John L; Morrison, William H; Christophersen, Jon P; Motloch, Chester G

2014-10-21T23:59:59.000Z

2

Injection Locking Techniques for Spectrum Analysis  

SciTech Connect (OSTI)

Wideband spectrum analysis supports future communication systems that reconfigure and adapt to the capacity of the spectral environment. While test equipment manufacturers offer wideband spectrum analyzers with excellent sensitivity and resolution, these spectrum analyzers typically cannot offer acceptable size, weight, and power (SWAP). CMOS integrated circuits offer the potential to fully integrate spectrum analysis capability with analog front-end circuitry and digital signal processing on a single chip. Unfortunately, CMOS lacks high-Q passives and wideband resonator tunability that is necessary for heterodyne implementations of spectrum analyzers. As an alternative to the heterodyne receiver architectures, two nonlinear methods for performing wideband, low-power spectrum analysis are presented. The first method involves injecting the spectrum of interest into an array of injection-locked oscillators. The second method employs the closed loop dynamics of both injection locking and phase locking to independently estimate the injected frequency and power.

Gathma, Timothy D.; Buckwalter, James F. [Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Dr., La Jolla, CA 9209 (United States)

2011-04-19T23:59:59.000Z

3

Wavelet Spectrum Analysis and Ocean Wind Waves  

E-Print Network [OSTI]

Wavelet Spectrum Analysis and Ocean Wind Waves Paul C. Liu Abstract. Wavelet spectrum analysis is applied to a set of measured ocean wind waves data collected during the 1990 SWADE {Surface Wave Dynamics Experi- ment) program. The results reveal significantly new and previously unexplored Insights on wave

4

A Framework for Radio Frequency Spectrum Measurement and Analysis  

E-Print Network [OSTI]

A Framework for Radio Frequency Spectrum Measurement and Analysis V. Rory Petty ITTC-FY2008-TR allocation and the burgeoning problem of spectrum scarcity have prompted an examination of how the radio frequency spectrum is utilized. The radio frequency spectrum is an important national resource that impacts

Kansas, University of

5

Decision Analysis of Dynamic Spectrum Access Rules  

SciTech Connect (OSTI)

A current trend in spectrum regulation is to incorporate spectrum sharing through the design of spectrum access rules that support Dynamic Spectrum Access (DSA). This paper develops a decision-theoretic framework for regulators to assess the impacts of different decision rules on both primary and secondary operators. We analyze access rules based on sensing and exclusion areas, which in practice can be enforced through geolocation databases. Our results show that receiver-only sensing provides insufficient protection for primary and co-existing secondary users and overall low social welfare. On the other hand, using sensing information between the transmitter and receiver of a communication link, provides dramatic increases in system performance. The performance of using these link end points is relatively close to that of using many cooperative sensing nodes associated to the same access point and large link exclusion areas. These results are useful to regulators and network developers in understanding in developing rules for future DSA regulation.

Juan D. Deaton; Luiz A. DaSilva; Christian Wernz

2011-12-01T23:59:59.000Z

6

IMPLEMENTING THE STANDARD SPECTRUM METHOD FOR ANALYSIS OF ?-? COINCIDENCE SPECTRA  

SciTech Connect (OSTI)

The standard deconvolution analysis tool (SDAT) algorithms were developed and tested at the University of Texas at Austin. These algorithms utilize the standard spectrum technique for spectral analysis of {beta}-{gamma} coincidence spectra for nuclear explosion monitoring. Work has been conducted under this contract to implement these algorithms into a useable scientific software package with a graphical user interface. Improvements include the ability to read in PHD formatted data, gain matching, and data visualization. New auto-calibration algorithms were developed and implemented based on 137Cs spectra for assessment of the energy vs. channel calibrations. Details on the user tool and testing are included.

Biegalski, S.; Flory, Adam E.; Schrom, Brian T.; Ely, James H.; Haas, Derek A.; Bowyer, Ted W.; Hayes, James C.

2011-09-14T23:59:59.000Z

7

Spectrum Occupancy Analysis for Cognitive Radio Zhe Wang and Sana Salous  

E-Print Network [OSTI]

Spectrum Occupancy Analysis for Cognitive Radio Zhe Wang and Sana Salous School of Engineering frequency strategy has not been able to optimise the spectrum usage. Cognitive Radio could in theory allow spectrum to operate in. Cognitive Radio would hop into unused bands of the radio spectrum and hop out again

Haddadi, Hamed

8

Analysis of Ocean Electromagnetic Data Using a Hilbert Spectrum Approach  

Science Journals Connector (OSTI)

We apply a newly developed time series analysis technique the Hilbert?Huang Transform (HHT) to naturally occurring ocean electromagnetic data obtained from bottom?mounted sensors. The HHT was originally developed as an alternative to the Fourier power spectral density for the analysis of nonlinear phenomena in water waves. The HHT is applied to the data in two steps. In the first step an empirical mode decomposition is used to extract individual oscillatory modes possessing different characteristic time scales. Unlike Fourier modes however these modes can vary in amplitude and frequency. In the second step the Hilbert transform is used to determine physically meaningful instantaneous frequencies from these modes. We present results showing that the HHT provides a more compact representation of the ocean electromagnetic environment than the Fourier spectrum. In particular the HHT is able to capture nonlinear wave phenomena associated with ocean swell in a single mode without the need for higher order harmonics.

Jeffrey Ridgway; Michael L. Larsen; Cye H. Waldman; Michael Gabbay; Rodney R. Buntzen; C. David Rees

2003-01-01T23:59:59.000Z

9

BAYESIAN ANGULAR POWER SPECTRUM ANALYSIS OF INTERFEROMETRIC DATA  

SciTech Connect (OSTI)

We present a Bayesian angular power spectrum and signal map inference engine which can be adapted to interferometric observations of anisotropies in the cosmic microwave background (CMB), 21 cm emission line mapping of galactic brightness fluctuations, or 21 cm absorption line mapping of neutral hydrogen in the dark ages. The method uses Gibbs sampling to generate a sampled representation of the angular power spectrum posterior and the posterior of signal maps given a set of measured visibilities in the uv-plane. We use a mock interferometric CMB observation to demonstrate the validity of this method in the flat-sky approximation when adapted to take into account arbitrary coverage of the uv-plane, mode-mode correlations due to observations on a finite patch, and heteroschedastic visibility errors. The computational requirements scale as O(n{sub p} log n{sub p}) where n{sub p} measures the ratio of the size of the detector array to the inter-detector spacing, meaning that Gibbs sampling is a promising technique for meeting the data analysis requirements of future cosmology missions.

Sutter, P. M.; Wandelt, Benjamin D. [Department of Physics, 1110 West Green Street, University of Illinois at Urbana-Champaign, Urbana, IL 61801 (United States); Malu, Siddarth S. [Raman Research Institute, C V Raman Avenue, Bangalore 560080 (India)

2012-09-15T23:59:59.000Z

10

Frequency spectrum analysis of electromagnetic waves radiated by electrical discharges  

Science Journals Connector (OSTI)

In this study, we analyzed the frequency spectrum of the electromagnetic waves radiated by an electric discharge as a basic method for developing an on-line diagnostic technique for power equipment installed inside closed-switchboards. In order to simulate ... Keywords: closed-switchboard, electromagnetic shielding room, electromagnetic wave, frequency spectrum, local discharge, series arc discharge

Hyeon-Kyu Cha; Sun-Jae Kim; Dae-Won Park; Gyung-Suk Kil

2011-03-01T23:59:59.000Z

11

THE SPECTRUM AND TERM ANALYSIS OF V II  

SciTech Connect (OSTI)

The spectrum and extended term analysis of V II are presented. Fourier transform spectrometry was used to record high resolution spectra of singly ionized vanadium in the region 1492-5800 A (67020-17260 cm{sup -1}) with vanadium-neon and vanadium-argon hollow cathode lamps as sources. The wavenumber uncertainty for the center of gravity of the strongest lines is typically 0.002 cm{sup -1}, an improvement of an order of magnitude over previous measurements. Most of the lines exhibit partly resolved hyperfine structure. The V II energy levels in the 1985 compilation of Sugar and Corliss have been confirmed and revised, with the exception of the high-lying 4f levels and eight of the lower levels. Thirty-nine of the additional eighty-five high levels published by Iglesias et al. have also been confirmed and revised, and three of their missing levels have been found. The energy uncertainty of the revised levels has been reduced by about an order of magnitude. In total, 176 even levels and 233 odd levels are presented. Wavenumbers and classifications are given for 1242 V II lines.

Thorne, A. P.; Pickering, J. C.; Semeniuk, J. I., E-mail: j.pickering@imperial.ac.uk [Blackett Laboratory, Imperial College, London SW7 2BZ (United Kingdom)

2013-07-15T23:59:59.000Z

12

COBE Data Spatial--Frequency Analysis and CMB Anisotropy Spectrum  

E-Print Network [OSTI]

We discuss the problem of CMB spectrum corruption during Galactic emission removing. A new technique of spatial--frequency data reduction is proposed. The technique gives us a possibility to avoid a spatial harmonics nonorthogonality. The proposed technique is applied to the two-year COBE DMR sky maps. We exclude the harmonics with l=7, 9,13, 23 and 25 as having anomalous statistics noise behavior. One shows that procedure do not give systematic errors, if the data are statistically regular. The spectral parameter of the power spectrum of primordial perturbation $n=1.84 \\pm 0.29$ and quadrupole moment $Q_2=15.22 \\pm 3.0$ are estimated. The power spectrum estimation results are inconsistent with the Harrison-Zel`dovich $n=1$ model with the confidence 99%. It is shown a necessity of an increasing a survey sensitivity to reach a more reliable estimation of the cosmological signal.

A. A. Brukhanov; D. P. Skulachev; I. A. Strukov; T. V. Konkina

1995-12-22T23:59:59.000Z

13

Dynamic Spectrum Analysis of High-Speed Train Passenger Compartment Luggage Rack Noise  

Science Journals Connector (OSTI)

In order to understand the dynamic changes of vibration radiation noise of high-speed train’s passenger compartment luggage rack, the dynamic spectrum is used for analysis ... , spectral structure and dynamic ran...

Chuanhui Wu; Xiangling Gao; Pinxian Gao

2012-01-01T23:59:59.000Z

14

Video-Aided Analysis of Zebrafish Locomotion and Anxiety-Related Behavioral Responses  

E-Print Network [OSTI]

Chapter 1 Video-Aided Analysis of Zebrafish Locomotion and Anxiety-Related Behavioral Responses their behavioral phenotypes. Video-aided analysis of zebrafish behavior offers an increased spectrum of behavioral. This protocol describes a method for fast, accurate, and consistent video-aided measurements of zebrafish

Kalueff, Allan V.

15

Primordial power spectrum: a complete analysis with the WMAP nine-year data  

SciTech Connect (OSTI)

We have improved further the error sensitive Richardson-Lucy deconvolution algorithm making it applicable directly on the un-binned measured angular power spectrum of Cosmic Microwave Background observations to reconstruct the form of the primordial power spectrum. This improvement makes the application of the method significantly more straight forward by removing some intermediate stages of analysis allowing a reconstruction of the primordial spectrum with higher efficiency and precision and with lower computational expenses. Applying the modified algorithm we fit the WMAP 9 year data using the optimized reconstructed form of the primordial spectrum with more than 300 improvement in ?{sup 2}{sub eff} with respect to the best fit power-law. This is clearly beyond the reach of other alternative approaches and reflects the efficiency of the proposed method in the reconstruction process and allow us to look for any possible feature in the primordial spectrum projected in the CMB data. Though the proposed method allow us to look at various possibilities for the form of the primordial spectrum, all having good fit to the data, proper error-analysis is needed to test for consistency of theoretical models since, along with possible physical artefacts, most of the features in the reconstructed spectrum might be arising from fitting noises in the CMB data. Reconstructed error-band for the form of the primordial spectrum using many realizations of the data, all bootstrapped and based on WMAP 9 year data, shows proper consistency of power-law form of the primordial spectrum with the WMAP 9 data at all wave numbers. Including WMAP polarization data in to the analysis have not improved much our results due to its low quality but we expect Planck data will allow us to make a full analysis on CMB observations on both temperature and polarization separately and in combination.

Hazra, Dhiraj Kumar; Shafieloo, Arman [Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 790-784 (Korea, Republic of); Souradeep, Tarun, E-mail: dhiraj@apctp.org, E-mail: arman@apctp.org, E-mail: tarun@iucaa.ernet.in [Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007 (India)

2013-07-01T23:59:59.000Z

16

Cross-spectrum Analyzer for Low Frequency Noise Analysis  

E-Print Network [OSTI]

The design and performance of a sensitive and reliable cross-correlation spectrum analyzer for studying low frequency transport noise is described in detail. The design makes use of common PC-based data acquisition hardware and preamplifiers to acquire time-based data, along with software we have developed to compute the cross-correlation and noise spectral density. The impedance of device under test may cover four decades from ${100\\,{\\Omega}}$ to ${1\\,{\\mathrm{M}\\Omega}}$. By utilizing a custom developed signal processing program, this system is tested to be accurate and efficient for measuring voltage noise as low as $\\sim\\!10^{-19}\\,\\mathrm{V}^2/\\mathrm{Hz}$ from ${0.001\\,}$Hz to ${100\\,}$kHz within one day's averaging time, comparable with more expensive hardware solutions (bandwidth in real measurements may be limited by the sample impedance and stray capacitance). The time dependence of measurement sensitivity is discussed theoretically and characterized experimentally to optimize between measuring tim...

Zhong, Xing; Jones, Josh; Mewes, Claudia; LeClair, Patrick R

2014-01-01T23:59:59.000Z

17

Forced response analysis of hydroelectric systems  

Science Journals Connector (OSTI)

At off-design operating points, Francis turbines develop cavitation vortex rope in the draft tube which may interact with the hydraulic system. Risk resonance assessment by means of eigenmodes computation of the system is usually performed. However, the system response to the excitation source induced by the cavitation vortex rope is not predicted in terms of amplitudes and phase. Only eigenmodes shapes with related frequencies and dampings can be predicted. Besides this modal analysis, the risk resonance assessment can be completed by a forced response analysis. This method allows identifying the contribution of each eigenmode into the system response which depends on the system boundary conditions and the excitation source location. In this paper, a forced response analysis of a Francis turbine hydroelectric power plant including hydraulic system, rotating train, electrical system and control devices is performed. First, the general methodology of the forced response analysis is presented and validated with time domain simulations. Then, analysis of electrical, hydraulic and hydroelectric systems are performed and compared to analyse the influence of control structures on pressure fluctuations induced by cavitation vortex rope.

S Alligné; P C O Silva; A Béguin; B Kawkabani; P Allenbach; C Nicolet; F Avellan

2014-01-01T23:59:59.000Z

18

294 IEEE COMMUNICATIONS LETTERS, VOL. 13, NO. 5, MAY 2009 Analysis of Cognitive Radio Spectrum Access with  

E-Print Network [OSTI]

294 IEEE COMMUNICATIONS LETTERS, VOL. 13, NO. 5, MAY 2009 Analysis of Cognitive Radio Spectrum Member, IEEE Abstract--A new loss model for cognitive radio spectrum access with finite user population the delay performance of a cognitive radio system under various primary traffic loads and spectrum band

Wong, Eric Wing-Ming

19

Alpha-amylase, cortisol, and pupillary responses to social and non-social dynamic scenes in young children with autism spectrum disorder  

E-Print Network [OSTI]

ALPHA-AMYLASE, CORTISOL, AND PUPILLARY RESPONSES TO SOCIAL AND NON- SOCIAL DYNAMIC SCENES IN YOUNG CHILDREN WITH AUTISM SPECTRUM DISORDER BY Christa J. Anderson Submitted to the graduate degree program in Psychology... dissertation: ALPHA-AMYLASE, CORTISOL, AND PUPILLARY RESPONSES TO SOCIAL AND NON- SOCIAL DYNAMIC SCENES IN YOUNG CHILDREN WITH AUTISM SPECTRUM DISORDER Committee: John Colombo_______________________ Chairperson* Stephen C. Fowler...

Anderson, Christa J.

2010-04-27T23:59:59.000Z

20

Evidences of high energy protons with energies beyond 0.4 GeV in the solar particle spectrum as responsible for the cosmic rays solar diurnal anisotropy  

E-Print Network [OSTI]

Analysis on the daily variations of cosmic ray muons with $E_{\\mu}\\geq 0.2 GeV$ based on the data of two directional muon telescopes at sea level and with a rigidity of response to cosmic proton spectrum above 0.4 GV is presented. The analysis covers two months of observations and in 60% of days, abrupt transitions between a low to a high muon intensity and vice-verse is observed, the period of high muon intensity is from $\\sim 8.0h$ up to $\\sim 19.0h$ (local time) and coincides with the period when the interplanetary magnetic field (IMF) lines overtake the Earth. This behavior strongly suggest that the high muon intensity is due to a contribution of solar protons (ions) on the muon intensity produced by the galactic cosmic rays, responsible for the low muon intensity. This implies that the solar particle spectrum extends to energies beyond 1 GeV. We show that this picture can explain the solar daily variation origin, and it is a most accurate scenario than the assumption of corotating galactic cosmic ray with the IMF lines, specially in the high rigidity region. Obtained results are consistent with the data reported in others papers. Some aspects on the sensitivity of our muon telescopes are also presented.

C. E. Navia; C. R. A. Augusto; M. B. Robba; K. H. Tsui

2007-06-26T23:59:59.000Z

Note: This page contains sample records for the topic "response spectrum 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

Response Predicting LTCC Firing Shrinkage: A Response Surface Analysis Study  

SciTech Connect (OSTI)

The Low Temperature Cofired Ceramic (LTCC) technology is used in a variety of applications including military/space electronics, wireless communication, MEMS, medical and automotive electronics. The use of LTCC is growing due to the low cost of investment, short development time, good electrical and mechanical properties, high reliability, and flexibility in design integration (3 dimensional (3D) microstructures with cavities are possible)). The dimensional accuracy of the resulting x/y shrinkage of LTCC substrates is responsible for component assembly problems with the tolerance effect that increases in relation to the substrate size. Response Surface Analysis was used to predict product shrinkage based on specific process inputs (metal loading, layer count, lamination pressure, and tape thickness) with the ultimate goal to optimize manufacturing outputs (NC files, stencils, and screens) in achieving the final product design the first time. Three (3) regression models were developed for the DuPont 951 tape system with DuPont 5734 gold metallization based on green tape thickness.

Girardi, Michael; Barner, Gregg; Lopez, Cristie; Duncan, Brent; Zawicki, Larry

2009-02-25T23:59:59.000Z

22

Predicting Flaw-Induced Resonance Spectrum Shift with Theoretical Perturbation Analysis  

SciTech Connect (OSTI)

Resonance inspection is an emerging non-destructive evaluation (NDE) technique which uses the resonance spectra differences between the good part population and the flawed parts to identify anomalous parts. It was previously established that finite-element (FE)-based modal analysis can be used to predict the resonance spectrum for an engineering scale part with relatively good accuracy. However, FE-based simulations can be time consuming in examining the spectrum shifts induced by all possible structural flaws. This paper aims at developing a computationally efficient perturbation technique to quantify the frequency shifts induced by small structural flaws, based on the FE simulated resonance spectrum for the perfect part. A generic automotive connecting rod is used as the example part for our study. The results demonstrate that the linear perturbation theory provides a very promising way in predicting frequency changes induced by small structural flaws. As the flaw size increases, the discrepancy between the perturbation analysis and the actual FE simulation results increases due to nonlinearity, yet the perturbation analysis is still able to predict the right trend in frequency shift.

Lai, Canhai; Sun, Xin

2013-10-28T23:59:59.000Z

23

Tsunami response at Wake Island: azimuthal mode analysis  

E-Print Network [OSTI]

Committee: Dr. Andrew C. Vastano This is sn extension of previous studies (numerical and hydraulic) of the relative amplitude response at Wake Island associated with plane progressive incident waves of stipulated time history, whose spectrum includes... of the island, Van Dorn cautioned that the influence of Wake Island topography on the wave spectrum really remains unknown. In a later study of the same data, by Royer (1969), it was concluded that the island topography may modify waves of certain periods...

Creswell, Wiltie Austin

2012-06-07T23:59:59.000Z

24

Analysis of Open Automated Demand Response Deployments in California  

E-Print Network [OSTI]

LBNL-6560E Analysis of Open Automated Demand Response Deployments in California and Guidelines The work described in this report was coordinated by the Demand Response Research. #12; #12;Abstract This report reviews the Open Automated Demand Response

25

Stay or Switch? Analysis and Comparison of Interweave and Underlay Spectrum Access in  

E-Print Network [OSTI]

--Cognitive Networks have been proposed to opportunistically discover and exploit licensed spectrum bands, in which, measurements of the utilization of licensed wireless spectrum in fact reveal that the available spectrum this issue, dynamic spectrum access tech- niques have recently been proposed, with cognitive radio (CR

Gesbert, David

26

A novel acquisition method of nuclear spectrum based on pulse area analysis  

E-Print Network [OSTI]

A novel method based on pulse area analysis(PAA) was presented for acquisition nuclear spectrum by the digitizer. PAA method can be used as a substitute for the traditional method of pulse height analysis (PHA). In the PAA method a commercial digitizer was employed to sample and sum in the pulse, and the area of pulse is proportional to the energy of the detected radiation. The results of simulation and experiment indicate the great advantages of PAA method, especially when the count rate is high and shaping time constant is small. When shaping time constant is 0.5us, the energy resolution of PAA is about 66% better than that of PHA.

Dongcang, Li; Lei, Yang; Zhong, Qi; Xiangting, Meng; Bitao, Hu

2014-01-01T23:59:59.000Z

27

A novel acquisition method of nuclear spectrum based on pulse area analysis  

E-Print Network [OSTI]

A novel method based on pulse area analysis(PAA) was presented for acquisition nuclear spectrum by the digitizer. PAA method can be used as a substitute for the traditional method of pulse height analysis (PHA). In the PAA method a commercial digitizer was employed to sample and sum in the pulse, and the area of pulse is proportional to the energy of the detected radiation. The results of simulation and experiment indicate the great advantages of PAA method, especially when the count rate is high and shaping time constant is small. When shaping time constant is 0.5us, the energy resolution of PAA is about 66% better than that of PHA.

Li Dongcang; Ren Zhongguo; Yang Lei; Qi Zhong; Meng Xiangting; Hu Bitao

2014-07-23T23:59:59.000Z

28

Bayesian statistics applied to neutron activation data for reactor flux spectrum analysis  

Science Journals Connector (OSTI)

Abstract In this paper, we present a statistical method, based on Bayesian statistics, to analyze the neutron flux spectrum from the activation data of different isotopes. The experimental data were acquired during a neutron activation experiment performed at the TRIGA Mark II reactor of Pavia University (Italy) in four irradiation positions characterized by different neutron spectra. In order to evaluate the neutron flux spectrum, subdivided in energy groups, a system of linear equations, containing the group effective cross sections and the activation rate data, has to be solved. However, since the system’s coefficients are experimental data affected by uncertainties, a rigorous statistical approach is fundamental for an accurate evaluation of the neutron flux groups. For this purpose, we applied the Bayesian statistical analysis, that allows to include the uncertainties of the coefficients and the a priori information about the neutron flux. A program for the analysis of Bayesian hierarchical models, based on Markov Chain Monte Carlo (MCMC) simulations, was used to define the problem statistical model and solve it. The first analysis involved the determination of the thermal, resonance-intermediate and fast flux components and the dependence of the results on the Prior distribution choice was investigated to confirm the reliability of the Bayesian analysis. After that, the main resonances of the activation cross sections were analyzed to implement multi-group models with finer energy subdivisions that would allow to determine the neutron flux groups, their uncertainties and correlations with good accuracy. The results were then compared with the ones obtained from the Monte Carlo simulations of the reactor fluxes performed with the MCNP code, finding in general a good agreement.

Davide Chiesa; Ezio Previtali; Monica Sisti

2014-01-01T23:59:59.000Z

29

Demand Response Analysis in Smart Grids Using Fuzzy Clustering Model  

Science Journals Connector (OSTI)

This paper focuses on an analysis of demand response in a smart grid context, presenting the ... A fuzzy subtractive clustering method is applied to demand response on several domestic consumption scenarios and r...

R. Pereira; A. Fagundes; R. Melício…

2013-01-01T23:59:59.000Z

30

Solar Neutrino Rates, Spectrum, and its Moments : an MSW Analysis in the Light of Super-Kamiokande Results  

E-Print Network [OSTI]

We re-examine MSW solutions of the solar neutrino problem in a two flavor scenario taking (a) the results on total rates and the electron energy spectrum from the 1117-day SuperKamiokande (SK) data and (b) those on total rates from the Chlorine and Gallium experiments. We find that the SMA solution gives the best fit to the total rates data from the different experiments. One new feature of our analysis is the use of the moments of the SK electron spectrum in a $\\chi^2$ analysis. The best-fit to the moments is broadly in agreement with that obtained from a direct fit to the spectrum data and prefers a $\\Delta m^2$ comparable to the SMA fit to the rates but the required mixing angle is larger. In the combined rate and spectrum analysis, apart from varying the normalization of the $^8$B flux as a free parameter and determining its best-fit value we also obtain the best-fit parameters when correlations between the rates and the spectrum data are included and the normalization of the $^8$B flux held fixed at its SSM value. We observe that the correlations between the rates and spectrum data are important and the goodness of fit worsens when these are included. In either case, the best-fit lies in the LMA region.

Srubabati Goswami; Debasish Majumdar; Amitava Raychaudhuri

2001-04-09T23:59:59.000Z

31

Analysis of Spectrum Utilization in Suburb Environment Evaluation of Potentials for Cognitive Radio  

E-Print Network [OSTI]

antenna. Our results show that the radio spectrum is not utilized in an optimal manner and that there do in an opportunistic way. Cognitive radio concept for better spectrum utilization is introduced here along allocation. The radio spectrum is assigned or sold to users on long term basis, covering large regions like

Paris-Sud XI, Université de

32

Data-Adaptive Wavelets and Multi-Scale Singular Spectrum Analysis  

E-Print Network [OSTI]

Using multi-scale ideas from wavelet analysis, we extend singular-spectrum analysis (SSA) to the study of nonstationary time series of length $N$ whose intermittency can give rise to the divergence of their variance. SSA relies on the construction of the lag-covariance matrix C on M lagged copies of the time series over a fixed window width W to detect the regular part of the variability in that window in terms of the minimal number of oscillatory components; here W = M Dt, with Dt the time step. The proposed multi-scale SSA is a local SSA analysis within a moving window of width M fractal or power-law behavior which mimic selected features of certain climatic and geophysical time series. A real application is to the Southern Oscillation index (SOI) monthly values for 1933-1996. Our methodology highlights an abrupt periodicity shift in the SOI near 1960. This abrupt shift between 4 and 3 years supports the Devil's staircase scenario for the El Nino/Southern Oscillation phenomenon.

P. Yiou; D. Sornette; M. Ghil

1998-10-29T23:59:59.000Z

33

Extreme Response Analysis A. Naess1,2)  

E-Print Network [OSTI]

NTNU Extreme Response Analysis A. Naess1,2) 1) Centre for Ships and Ocean Structures (CeSOS) 2) Department of Mathematical Sciences Norwegian University of Science and Technology Trondheim, Norway Extreme Response Analysis ­ p. 1/33 #12;NTNU Introduction The approach to extreme value statistics generally

Nørvåg, Kjetil

34

High Efficiency, Spectrum Splitting Solar Cell Assemblies: Design, Measurement and Analysis  

Science Journals Connector (OSTI)

A spectrum splitting photovoltaic architecture was proposed for high energy conversion efficiency. Assemblies of this architecture were constructed, measured and analyzed, which allow...

Barnett, Allen; Wang, Xiaoting

35

Fluorescence spectrum analysis using Fourier series modeling for Fluorescein solution in Ethanol  

E-Print Network [OSTI]

We have measured the fluorescence spectrum for fluorescein solution in ethanol with concentration 1 {\\times} 10-3 mol/liter at different temperatures from room temperature to freezing point of solvent, (T = 153, 183, 223, 253, and 303 K) using liquid nitrogen. Table curve 2D version 5.01 program has been used to determine the fitting curve and fitting equation for each fluorescence spectrum. Fourier series (3 {\\times} 2) was the most suitable fitting equation for all spectra. Theoretical fluorescence spectrum of fluorescein in ethanol at T = 183K was calculated and compared with experimental fluorescence spectrum at the same temperature. There is a good similarity between them.

Hadi, Mahasin F

2011-01-01T23:59:59.000Z

36

Spectrum usage models for the analysis, design and simulation of cognitive radio networks.  

E-Print Network [OSTI]

??The owned spectrum allocation policy, in use since the early days of modern radio communications, has been proven to effectively control interference among radio communication… (more)

López Benítez, Miguel

2011-01-01T23:59:59.000Z

37

Beyond Design Basis Events Analysis and Response Information | Department  

Broader source: Energy.gov (indexed) [DOE]

Beyond Design Basis Events Analysis Beyond Design Basis Events Analysis and Response Information Beyond Design Basis Events Analysis and Response Information September 19-20, 2012 Beyond Design Basis Events Analysis and Response Information DOE's Safety Bulletin No. 2011-01, Events Beyond Design Safety Basis Analysis, March 2011 DOE's Nuclear Safety Workshop Newsletter, June 2011 2011 Nuclear Safety Workshop Presentations, June 2011 Transmittal Memorandum, Report on Review of Requirements and Capabilities for Analyzing and Responding to Beyond Design Basis Events, September 2011 Review of Requirements and Capabilities for Analyzing and Responding to Beyond Design Basis Events, August 2011 NRC Report - Recommendations for Enhancing Reactor Safety in the 21st Century; The Near-Term Task Force Review of Insights from the

38

The 2dF Galaxy Redshift Survey: Power-spectrum analysis of the final dataset and cosmological implications  

E-Print Network [OSTI]

We present a power spectrum analysis of the final 2dF Galaxy Redshift Survey, employing a direct Fourier method. The sample used comprises 221,414 galaxies with measured redshifts. We investigate in detail the modelling of the sample selection. A new angular mask is derived, based on revisions to the photometric calibration. The redshift selection function is determined by dividing the survey according to rest-frame colour, and deducing a self-consistent treatment of k-corrections and evolution for each population. The covariance matrix for the power-spectrum estimates is determined using two different approaches to the construction of mock surveys which are used to demonstrate that the input cosmological model can be correctly recovered. We are confident that the 2dFGRS power spectrum can be used to infer the matter content of the universe. On large scales, our estimated power spectrum shows evidence for the `baryon oscillations' that are predicted in CDM models. Fitting to a CDM model, assuming a primordial $n_{s}=1$ spectrum, $h=0.72$ and negligible neutrino mass, the preferred parameters are $\\Omega_{M} h = 0.168 \\pm 0.016$ and a baryon fraction $\\Omega_{b} /\\Omega_{M} = 0.185\\pm0.046$ (1$\\sigma$ errors). The value of $\\Omega_{M} h$ is $1\\sigma$ lower than the $0.20 \\pm 0.03$ in our 2001 analysis of the partially complete 2dFGRS. This shift is largely due to the signal from the newly-sampled regions of space, rather than the refinements in the treatment of observational selection. This analysis therefore implies a density significantly below the standard $\\Omega_{M} =0.3$: in combination with CMB data from WMAP, we infer $\\Omega_{M} =0.231\\pm 0.021$. (Abridged.)

S. Cole; W. J. Percival; J. A. Peacock; P. Norberg; C. M. Baugh; C. S. Frenk; I. Baldry; J. Bland-Hawthorn; T. Bridges; R. Cannon; M. Colless; C. Collins; W. Couch; N. J. G. Cross; G. Dalton; V. R. Eke; R. De Propris; S. P. Driver; G. Efstathiou; R. S. Ellis; K. Glazebrook; C. Jackson; A. Jenkins; O. Lahav; I. Lewis; S. Lumsden; S. Maddox; D. Madgwick; B. A. Peterson; W. Sutherland; K. Taylor

2005-08-05T23:59:59.000Z

39

Perspective on Beyond Design Basis Event Analysis and Response | Department  

Broader source: Energy.gov (indexed) [DOE]

Perspective on Beyond Design Basis Event Analysis and Response Perspective on Beyond Design Basis Event Analysis and Response Perspective on Beyond Design Basis Event Analysis and Response September 20, 2012 Presenter: John Schwenker, Nuclear Safety Manager for Liquid Operations, Savannah River Remediation, LLC, Savannah River Site Topics Covered: Waste Tanks can contain up to 1.3 Millions Gallons of highly radioactive waste (sludge, salt, supernate). Type III/IIIA Waste Tank Structures and berms are PC-3 Qualified. Tanks may fail in a Beyond Design Basis Seismic Event. Waste could flow above ground to streams and rivers. Unmitigated Tank Explosion exceeds offsite Evaluation Guidelines Hydrogen gas can be trapped in the sludge and saltcake structure. Seismic Event can cause a prompt release of trapped hydrogen. It is not physically practical to install a ventilation system that

40

Gamma-ray bursts prompt emission spectrum: an analysis of a photosphere model  

Science Journals Connector (OSTI)

...research-article Discussion Meeting Issue Gamma-ray bursts organized by Alan Wells, Ralph...J. Wijers and Martin Rees Gamma-ray bursts prompt emission spectrum: an...stages of the prompt emission of gamma-ray bursts (GRBs) and X-ray flashes...

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "response spectrum 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

The application of spectrum standardization method for carbon analysis in coal using laser-induced breakdown spectroscopy  

E-Print Network [OSTI]

Measurements of carbon content in coal using laser-induced breakdown spectroscopy (LIBS) is limited by its low measurement precision and accuracy. A spectrum standardization method was proposed to achieve both reproducible and accurate results for the quantitative analysis of carbon content in coal with LIBS. The proposed method utilized the molecular carbon emissions to compensate the diminution of atomic carbon emission caused by matrix effect. The compensated carbon line intensities were further converted into an assumed standard state with fixed plasma temperature, electron density, and total number density of elemental carbon, which is proportional to its concentration in the coal samples. In addition, in order to obtained better compensation for total carbon number density fluctuations, an iterative algorithm was applied, which is different from our previous standardization calculations. The modified spectrum standardization model was applied to the measurement of carbon content in 24 bituminous coal sa...

Li, Xiongwei; Fu, Yangting; Li, Zheng; Liu, Jianming; Ni, Weidou

2014-01-01T23:59:59.000Z

42

Modeling, Analysis, and Control of Demand Response Resources  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Modeling, Analysis, and Control of Demand Response Resources Modeling, Analysis, and Control of Demand Response Resources Speaker(s): Johanna Mathieu Date: April 27, 2012 - 12:00pm Location: 90-3122 Seminar Host/Point of Contact: Sila Kiliccote While the traditional goal of an electric power system has been to control supply to fulfill demand, the demand-side can play an active role in power systems via Demand Response (DR). Recent DR programs have focused on peak load reduction in commercial buildings and industrial facilities (C&I facilities). We present a regression-based baseline model, which allows us to quantify DR performance. We use this baseline model to understand the performance of C&I facilities participating in an automated dynamic pricing DR program in California. In this program, facilities are

43

Analysis of offsite Emergency Planning Zones (EPZs) for the Rocky Flats Plant. Phase 3, Sitewide spectrum-of-accidents and bounding EPZ analysis  

SciTech Connect (OSTI)

During Phase 3 of the EPZ project, a sitewide analysis will be performed applying a spectrum-of-accidents approach to both radiological and nonradiological hazardous materials release scenarios. This analysis will include the MCA but will be wider in scope and will produce options for the State of Colorado for establishing a bounding EPZ that is intended to more comprehensively update the interim, preliminary EPZ developed in Phase 2. EG&G will propose use of a hazards assessment methodology that is consistent with the DOE Emergency Management Guide for Hazards Assessments and other methods required by DOE orders. This will include hazards, accident, safety, and risk analyses. Using this methodology, EG&G will develop technical analyses for a spectrum of accidents. The analyses will show the potential effects from the spectrum of accidents on the offsite population together with identification of offsite vulnerable zones and areas of concern. These analyses will incorporate state-of-the-art technology for accident analysis, atmospheric plume dispersion modeling, consequence analysis, and the application of these evaluations to the general public population at risk. The analyses will treat both radiological and nonradiological hazardous materials and mixtures of both released accidentally to the atmosphere. DOE/RFO will submit these results to the State of Colorado for the State`s use in determining offsite emergency planning zones for the Rocky Flats Plant. In addition, the results will be used for internal Rocky Flats Plant emergency planning.

Petrocchi, A.J.; Zimmerman, G.A.

1994-03-14T23:59:59.000Z

44

Orbit Response Matrix Analysis Applied at PEP-II  

SciTech Connect (OSTI)

The analysis of orbit response matrices has been used very successfully to measure and correct the gradient and skew gradient distribution in many accelerators. It allows determination of an accurately calibrated model of the coupled machine lattice, which then can be used to calculate the corrections necessary to improve coupling, dynamic aperture and ultimately luminosity. At PEP-II, the Matlab version of LOCO has been used to analyze coupled response matrices for both the LER and the HER. The large number of elements in PEP-II and the very complicated interaction region present unique challenges to the data analysis. All necessary tools to make the analysis method useable at PEP-II have been implemented and LOCO can now be used as a routine tool for lattice diagnostic.

Steier, C.; Wolski, A.; /LBL, Berkeley; Ecklund, S.; Safranek, J.A.; Tenenbaum, P.; Terebilo, A.; Turner, J.L.; Yocky, G.; /SLAC

2005-05-17T23:59:59.000Z

45

Green thermoelectrics: Observation and analysis of plant thermoelectric response  

E-Print Network [OSTI]

Plants are sensitive to thermal and electrical effects; yet the coupling of both, known as thermoelectricity, and its quantitative measurement in vegetal systems never were reported. We recorded the thermoelectric response of bean sprouts under various thermal conditions and stress. The obtained experimental data unambiguously demonstrate that a temperature difference between the roots and the leaves of a bean sprout induces a thermoelectric voltage between these two points. Basing our analysis of the data on the force-flux formalism of linear response theory, we found that the strength of the vegetal equivalent to the thermoelectric coupling is one order of magnitude larger than that in the best thermoelectric materials. Experimental data also show the importance of the thermal stress variation rate in the plant's electrophysiological response. Therefore, thermoelectric effects are sufficiently important to partake in the complex and intertwined processes of energy and matter transport within plants.

Goupil, C; Khamsing, A; Apertet, Y; Bouteau, F; Mancuso, S; Patino, R; Lecoeur, Ph

2015-01-01T23:59:59.000Z

46

Power spectrum analysis of the annual rainfall series for Massachusetts (NE, U.S.A.)  

Science Journals Connector (OSTI)

Maximum Entropy Spectral Analysis of the annual rainfall series for 1887–1976 (90 years) for Massachusetts (northeastern USA.) shows T...= 17.8 (very near the 18.6 year luni-solar signal) as the most prominent pe...

R. P. Kane; N. R. Teixeira

1991-01-01T23:59:59.000Z

47

Roughness-induced Transient Growth: Continuous-spectrum Receptivity and Secondary Instability Analysis  

E-Print Network [OSTI]

] investigated the boundary layer response to an array of roughness elements that were both repeatable and of significant size. He arranged an array of spheres on a flat plate and contrasted results with single spheres and multi-sphere arrays. These spheres....S., Case Western Reserve University Chair of Advisory Committee: Dr. Edward White This dissertation analyzes the effect of periodic roughness elements on the stability of a flat plate boundary layer. Receptivity data is extracted from direct numerical...

Denissen, Nicholas Allen

2012-07-16T23:59:59.000Z

48

A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry  

E-Print Network [OSTI]

Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since December 2006, has observed the star HD49933 twice. The oscillation spectrum of this star has proven difficult to interpret. Thanks to a new timeseries provided by CoRoT, we aim to provide a robust description of the oscillations in HD49933, i.e., to identify the degrees of the observed modes, and to measure mode frequencies, widths, amplitudes and the average rotational splitting. Several methods were used to model the Fourier spectrum: Maximum Likelihood Estimators and Bayesian analysis using Markov Chain Monte-Carlo techniques. The different methods yield consistent result, and allow us to make a robust identification of the modes and to extract precise mode parameters. Only the rotational splitting remains difficult to estimate precisely, but is clearly relatively large (several microHz in size).

Benomar, O; Campante, T L; Chaplin, W J; García, R A; Gaulme, P; Toutain, T; Verner, G A; Appourchaux, T; Ballot, J; Barban, C; Elsworth, Y; Mathur, S; Mosser, B; Régulo, C; Roxburgh, I W; Auvergne, M; Baglin, A; Catala, C; Michel, E; Samadi, R

2009-01-01T23:59:59.000Z

49

A systematic review and meta-analysis of the fMRI investigation of autism spectrum disorders  

Science Journals Connector (OSTI)

Recent years have seen a rapid increase in the investigation of autism spectrum disorders (ASD) through the use of functional magnetic resonance imaging (fMRI). We carried out a systematic review and ALE meta-analysis of fMRI studies of ASD. A disturbance to the function of social brain regions is among the most well replicated finding. Differences in social brain activation may relate to a lack of preference for social stimuli as opposed to a primary dysfunction of these regions. Increasing evidence points towards a lack of effective integration of distributed functional brain regions and disruptions in the subtle modulation of brain function in relation to changing task demands in ASD. Limitations of the literature to date include the use of small sample sizes and the restriction of investigation to primarily high functioning males with autism.

Ruth C.M. Philip; Maria R. Dauvermann; Heather C. Whalley; Katie Baynham; Stephen M. Lawrie; Andrew C. Stanfield

2012-01-01T23:59:59.000Z

50

Modeling, Analysis, and Control of Demand Response Resources  

E-Print Network [OSTI]

advanced metering and demand response in electricityGoldman, and D. Kathan. “Demand response in U.S. electricity29] DOE. Benefits of demand response in electricity markets

Mathieu, Johanna L.

2012-01-01T23:59:59.000Z

51

A study of wind variability in the lower troposphere through power spectrum analysis at mesoscale frequencies  

E-Print Network [OSTI]

on the theoretical and practical application of the analysis method comes directly from this reference. B. Fundamental Assum tions of Power S ectrum Theor Consider a function of time X(t), such as wind speed, which is generated by a random process. Then the value... of the function X(t) at any particular point in time is a random variable. This random process may or may not have a Gaussian or normal distribution but it is a fundamental assumption (at least in the development of the theory) that the random process...

Cornett, John Sheldon

1966-01-01T23:59:59.000Z

52

A study of the ground and excited states of Al3 and Al3 Computational analysis of the 488 nm anion photoelectron spectrum  

E-Print Network [OSTI]

A study of the ground and excited states of Al3 and Al3 - . II. Computational analysis of the 488 nm anion photoelectron spectrum and a reconsideration of the Al3 bond dissociation energy Stephen R-lying excited electronic states of Al3 - and Al3 and compared with the available spectroscopic data

Truhlar, Donald G

53

Microarray analysis of IFN-? response genes in astrocytes  

Science Journals Connector (OSTI)

IFN-gamma (IFN-?) has been shown to activate astrocytes to acquire immune functions. In this study the effect of IFN-? on murine astrocytes was investigated via microarray analysis. The activating effect of IFN-? on the astrocyte transcriptome showed predominance toward pathways involved in adaptive immunity, initiation of the immune response and innate immunity. Previously unknown astrocytic genes expressed included members of the p47 \\{GTPases\\} and guanine nucleotide binding protein (GBP) families. Down-regulatory effects of IFN-? stimulation were confined to pathways involved in growth regulation, cell differentiation and cell adhesion. This data supports the notion that astrocytes are an important immunocompetant cell in the brain and indicate that astrocytes may have a significant role in various infectious diseases such as Toxoplasmic Encephalitis and neurological diseases with an immunological component such as Alzheimer's and autoimmune disorders.

Sandra K. Halonen; Tyson Woods; Kate McInnerney; Louis M. Weiss

2006-01-01T23:59:59.000Z

54

Global analysis of heat shock response in Desulfovibrio vulgaris Hildenborough.  

SciTech Connect (OSTI)

Desulfovibrio vulgaris Hildenborough belongs to a class of sulfate-reducing bacteria (SRB) and is found ubiquitously in nature. Given the importance of SRB-mediated reduction for bioremediation of metal ion contaminants, ongoing research on D. vulgaris has been in the direction of elucidating regulatory mechanisms for this organism under a variety of stress conditions. This work presents a global view of this organism's response to elevated growth temperature using whole-cell transcriptomics and proteomics tools. Transcriptional response (1.7-fold change or greater; Z {ge} 1.5) ranged from 1,135 genes at 15 min to 1,463 genes at 120 min for a temperature up-shift of 13 C from a growth temperature of 37 C for this organism and suggested both direct and indirect modes of heat sensing. Clusters of orthologous group categories that were significantly affected included posttranslational modifications; protein turnover and chaperones (up-regulated); energy production and conversion (down-regulated), nucleotide transport, metabolism (down-regulated), and translation; ribosomal structure; and biogenesis (down-regulated). Analysis of the genome sequence revealed the presence of features of both negative and positive regulation which included the CIRCE element and promoter sequences corresponding to the alternate sigma factors {sigma}{sup 32} and {sigma}{sup 54}. While mechanisms of heat shock control for some genes appeared to coincide with those established for Escherichia coli and Bacillus subtilis, the presence of unique control schemes for several other genes was also evident. Analysis of protein expression levels using differential in-gel electrophoresis suggested good agreement with transcriptional profiles of several heat shock proteins, including DnaK (DVU0811), HtpG (DVU2643), HtrA (DVU1468), and AhpC (DVU2247). The proteomics study also suggested the possibility of posttranslational modifications in the chaperones DnaK, AhpC, GroES (DVU1977), and GroEL (DVU1976) and also several periplasmic ABC transporters.

Arkin, A. P. (Physical Biosciences Division, Berkeley, CA); Wall, J. D. (University of Missouri-Columbia, Columbia, MO); Hazen, T. C. (Physical Biosciences Division, Berkeley, CA); He, Z. (Oak Ridge National Laboratory, Oak Ridge, TN); Zhou, J. (Oak Ridge National Laboratory, Oak Ridge, TN); Huang, K. H. (Physical Biosciences Division, Berkeley, CA); Gaucher, Sara P.; He, Q. (Oak Ridge National Laboratory, Oak Ridge, TN); Hadi, Masood Z.; Chhabra, Swapnil R.; Alm, Eric J. (Physical Biosciences Division, Berkeley, CA); Singh, A. K.

2005-08-01T23:59:59.000Z

55

The Analysis of Altered Ethylene Response in Arabidopsis.  

E-Print Network [OSTI]

??Ethylene is a simple plant hormone involved in fruit ripening, tissue senescence, germination and pathogen response. The characteristic triple response phenotype in Arabidopsis has facilitated… (more)

Alvarez, Ashley

2014-01-01T23:59:59.000Z

56

Broad spectrum solar cell  

DOE Patents [OSTI]

An alloy having a large band gap range is used in a multijunction solar cell to enhance utilization of the solar energy spectrum. In one embodiment, the alloy is In.sub.1-xGa.sub.xN having an energy bandgap range of approximately 0.7 eV to 3.4 eV, providing a good match to the solar energy spectrum. Multiple junctions having different bandgaps are stacked to form a solar cell. Each junction may have different bandgaps (realized by varying the alloy composition), and therefore be responsive to different parts of the spectrum. The junctions are stacked in such a manner that some bands of light pass through upper junctions to lower junctions that are responsive to such bands.

Walukiewicz, Wladyslaw (Kensington, CA); Yu, Kin Man (Lafayette, CA); Wu, Junqiao (Richmond, CA); Schaff, William J. (Ithaca, NY)

2007-05-15T23:59:59.000Z

57

Nonlinear seismic ground response analysis: code usage protocols and verification against vertical array data  

E-Print Network [OSTI]

Response Analysis: Code Usage Protocols and Verificationparameter selection and code usage protocols as well aslinear modeling. Regarding code usage/parameter selection

Stewart, Jonathan P; Kwok, Annie O.L.

2008-01-01T23:59:59.000Z

58

Dynamic response analysis of a 900 kW wind turbine subject to ground excitation  

E-Print Network [OSTI]

response analysis of wind turbine towers including soil-were attached to the wind turbine tower at 7 locations alongload demands on the wind turbine tower structure. Additional

Caudillo, Adrian Felix

2012-01-01T23:59:59.000Z

59

Seismic Response Analysis of Municipal Solid Waste Landfill  

Science Journals Connector (OSTI)

According to the engineering practice of municipal solid waste landfill, the dynamic response of landfill based on the finite element method is implemented. The equivalent linearization method is used to consider the non-linear dynamic response characteristics. ... Keywords: Dynamic response, Ground motion input, Finite element method

Zhang Guodong; Li Yong; Jin Xing; Li Rongbin; Chen Fei

2009-10-01T23:59:59.000Z

60

Analysis of offsite emergency planning zones (EPZs) for the Rocky Flats Plant. Phase 3, Sitewide spectrum-of-accidents and bounding EPZ analysis  

SciTech Connect (OSTI)

This Charter provides the basis for a cooperative, interagency effort to conduct Phase III of the ``Analysis of Offsite Emergency Planning Zones (EPZs) for the Rocky Flats Plant`` Project. The purpose of this Charter is to define the Project and establish an Oversight Committee management structure together with responsibilities and commitments. This Charter establishes a commitment on the part of the signing agencies to participate in a Phase III EPZ analysis to refine existing EPZs for the Rocky Flats Plant. These agencies agree to commit resources to this Project to fulfill their identified roles. The specific types and levels of resources committed by each agency will be determined as part of the Project planning process. This Charter does not commit any agency to any specific level of effort or resources. It does, however, commit these agencies to support the Phase III analysis to completion.

Petrocchi, A.J.; Smith, M.L.

1993-10-25T23:59:59.000Z

Note: This page contains sample records for the topic "response spectrum 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

Development of fatigue stress spectrum and fatigue life prediction of endless winder sheave for wind turbine lift using finite element analysis  

Science Journals Connector (OSTI)

This paper aims to develop the fatigue stress spectrum and predicted fatigue life of the endless winder sheave using finite element (FE) analysis which is utilized in wind turbine lift. First we identified the fatigue critical location (FCL) of endless winder sheave through a static FE analysis. And the lifting velocity was measured using the non-contact velocity dectector. Based on the measured lifting velocity and compressive loads by traction of endless winder sheave the compressive load-angle of rotation history at the FCL was determined. According to the compressive load-angle of rotation time history total 230 FE analyses were performed with the interval of the angle of rotation of 15° we eventually obtained the fatigue stress spectrum at the FCL. These results were processed using the rainflow cycle counting and the Goodman equation. Finally the fatigue life of sheave was evaluated using the linear damage cumulative rule.

2014-01-01T23:59:59.000Z

62

An analysis of the energy spectrum of near vertical muons above 3·1011 eV  

Science Journals Connector (OSTI)

Available data from a variety of cosmic-ray experiments are compared and analysed to give a best estimate of the integral spectrum of near vertical muons in the energy range 3·1011 eV

L. K. Ng; A. W. Wolfendale

1974-03-11T23:59:59.000Z

63

Analysis of the Ce 3d-4d4d Auger spectrum with the use of synchrotron radiation  

Science Journals Connector (OSTI)

We report 3d-4d4d Auger spectra of Ce metal with the use of synchrotron radiation to excite the initial core hole. By sweeping the excitation energy through the 3d?4f threshold, it has been possible to excite different initial states selectively, enabling us to analyze the complex spectrum in terms of different contributions arising from various decay channels.

D. D. Sarma; C. Carbone; R. Cimino; P. Sen; W. Gudat; W. Eberhardt

1993-03-01T23:59:59.000Z

64

Analysis of Automotive Turbocharger Nonlinear Response Including Bifurcations  

E-Print Network [OSTI]

automotive TCs operate with variable rotational speed, predictions are conducted with shaft acceleration/deceleration. Over most of its operating speed range, TC rotor nonlinear response predictions display two subsynchronous whirl frequencies w1 and w 2...

Vistamehr, Arian

2010-10-12T23:59:59.000Z

65

Use of Exact Solutions of Wave Propagation Problems to Guide Implementation of Nonlinear Seismic Ground Response Analysis Procedures  

E-Print Network [OSTI]

?1992?. SUMDES: A nonlinear procedure for response analysisusing ?nite element procedures and incorporating a compliantGround Response Analysis Procedures Annie O. L. Kwok, M.ASCE

2007-01-01T23:59:59.000Z

66

Analysis of Residential Demand Response and Double-Auction Markets  

SciTech Connect (OSTI)

Demand response and dynamic pricing programs are expected to play increasing roles in the modern Smart Grid environment. While direct load control of end-use loads has existed for decades, price driven response programs are only beginning to be explored at the distribution level. These programs utilize a price signal as a means to control demand. Active markets allow customers to respond to fluctuations in wholesale electrical costs, but may not allow the utility to control demand. Transactive markets, utilizing distributed controllers and a centralized auction can be used to create an interactive system which can limit demand at key times on a distribution system, decreasing congestion. With the current proliferation of computing and communication resources, the ability now exists to create transactive demand response programs at the residential level. With the combination of automated bidding and response strategies coupled with education programs and customer response, emerging demand response programs have the ability to reduce utility demand and congestion in a more controlled manner. This paper will explore the effects of a residential double-auction market, utilizing transactive controllers, on the operation of an electric power distribution system.

Fuller, Jason C.; Schneider, Kevin P.; Chassin, David P.

2011-10-10T23:59:59.000Z

67

A theoretical analysis of proportional counter response versus LET  

E-Print Network [OSTI]

'lowing this inspection, the beta spectrum for each of the five isotopes was generaL. d and the Ites'I) ts a~e shown in FTGS. 7, 8, 9, 10 and 11. The reduced EET equation wa. . compuLcd for an eI argy range of 0. 01 Ifcy to 1, 2 I'!eV 44hi! h inc1udcs the eneri y...V) FIG. 15. NcighLcd mass-absorption energy losses for iodine-131 negaL~ns in air . 28 1 0 0 ~ 8 0. 6 03 'a 0 ' 4 'o Ql P s' 0 ~ 2 0 ' 04 0 ~ 12 0 ~ 20 Energy (I'1eV) 0 ~ 36 11G. 16. '~~'sigh Led rsess ? absorption ener gy losses tor Xenon...

Martin, George Gerald

2012-06-07T23:59:59.000Z

68

Nonlinear seismic response analysis of steel-concrete composite frames  

E-Print Network [OSTI]

of nonlinear steel- concrete composite beam ele- ment. ”Tests and analysis of composite beams with incom- pleteElementary Behaviour of Composite Steel and Concrete Struc-

Barbato, Michele

2008-01-01T23:59:59.000Z

69

Risk decision analysis in emergency response: A method based on cumulative prospect theory  

Science Journals Connector (OSTI)

Emergency response of a disaster is generally a risk decision-making problem with multiple states. In emergency response analysis, it is necessary to consider decision-maker's (DM's) psychological behavior such as reference dependence, loss aversion and judgmental distortion, whereas DM's behavior is neglected in the existing studies on emergency response. In this paper, a risk decision analysis method based on cumulative prospect theory (CPT) is proposed to solve the risk decision-making problem in emergency response. The formulation and solution procedure of the studied emergency response problem are given. Then, according to CPT, the values of potential response results concerning each criterion are calculated. Consider the interdependence or conflict among criteria, Choquet integral is used to determine the values of each potential response result. Accordingly, the weights of probabilities of all potential response results are calculated. Furthermore, by aggregating the values and weights of response results, the prospect value of each response action (alternative) is determined, and overall prospect value of each response action is obtained by aggregating the prospect value and the cost of each action. According to the obtained overall prospect values, a ranking of all response actions can be determined. Finally, based on the background of emergency evacuation from barrier lake downstream villages, an example is given to illustrate the feasibility and validity of the proposed method.

Yang Liu; Zhi-Ping Fan; Yao Zhang

2014-01-01T23:59:59.000Z

70

Statistical energy analysis prediction of the response of offshore structures to random wave excitation  

Science Journals Connector (OSTI)

The principle of reciprocity is applied to dynamic response prediction of structures excited by ocean waves. It is shown that the modal wave force spectrum may be expressed in terms of the modal radiation damping coefficient. This leads to the familiar SEA result: that the damping controlled response of the resonator (a mode of an offshore structure) has an upper bound which occurs when the ratio of the radiation to the total damping approaches unity. This result is embodied in a general method for predicting the damping controlled response of a broad variety of oceanstructures. The method includes the effects of the highly directional nature of ocean wave spectra. Example calculations are presented for fixed and floating structures and the results of full scale tests are reported.

J. Kim Vandiver

1979-01-01T23:59:59.000Z

71

Responsibilities for support of beam line controls, data acquisition, and data analysis  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Intra-Laboratory Memo Intra-Laboratory Memo ANL-26A (3-06) 2010 March 22 FROM: Pete R. Jemian, Group Leader, AES Beam line Controls and Data Acquisition SUBJECT: Responsibilities for support of beam line controls, data acquisition, and data analysis Responsibilities for support of beam line controls, data acquisition, and data analysis This document provides guidelines defining the responsibilities for the software and hardware support of controls, data acquisition, and data analysis at APS beam lines. It has been created in direct response to a specific question from one of the APS/XSD/XOR sectors but is generalized for all beam lines managed by APS/XSD/XOR. The following table lists the basic responsibilities. Brief descriptions of the activities are provided after the table.

72

Analysis of residual spectra and the monopole spectrum for 3 K blackbody radiation by means of non-extensive thermostatistics  

E-Print Network [OSTI]

We analyze residual spectra of 3 K blackbody radiation (CMB) using non-extensive thermostatistics with a parameter q-1. The limits of |q-1|<1.2x10^{-5} and the temperature fluctuation |delta T|<(1.6-4.3)x10^{-5} are smaller than those by Tsallis et al. Moreover, analyzing the monopole spectrum by a formula including the chemical potential mu, we obtain the limits |q-1|<2.3x10^{-5} and |mu|<1.6x10^{-4}. |q-1| is comparable with the Sunyaev-Zeldovich effect y.

Minoru Biyajima; Takuya Mizoguchi

2012-10-22T23:59:59.000Z

73

Cost Principles Policy Responsible Office: Cost Analysis Effective Date: November 1, 2013  

E-Print Network [OSTI]

Cost Principles Policy Responsible Office: Cost Analysis Effective Date: November 1, 2013 Last-21, Cost Principles for Educational Institutions and the Cost Accounting Standards Board (CASB)) identify cost accounting policies that must be followed to receive federal awards. These regulations

Jawitz, James W.

74

Cost Principles Directives & Procedures Responsible Office: Cost Analysis Effective Date: November 1, 2013  

E-Print Network [OSTI]

1 Cost Principles Directives & Procedures Responsible Office: Cost Analysis Effective Date....................................................................................................................... 2 2. Guiding Principles to Determine the Charge of a Cost to a Sponosred Agreement ................................................................................................. 5 5.1. Personnel Costs

Jawitz, James W.

75

E-Print Network 3.0 - analysis reveals response Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

11 NATURE NEUROSCIENCE CO R R I G E N D UM Summary: > scrambled, P < 0.001, no spatial smoothing). Re- analysis of average category responses with cross... NATURE NEUROSCIENCE...

76

AIAA-2003-0867 STATISTICAL ANALYSIS OF INFLOW AND STRUCTURAL RESPONSE DATA  

E-Print Network [OSTI]

AIAA-2003-0867 1 STATISTICAL ANALYSIS OF INFLOW AND STRUCTURAL RESPONSE DATA FROM THE LIST PROGRAM, University of Texas at Austin, Austin, TX 78712 2 Wind Energy Technology Department, Sandia National is gathering inflow and structural response data on a modified version of the Micon 65/13 wind turbine

Manuel, Lance

77

Preliminary analysis of fission gas behavior and fuel response during an LMFBR operational transient  

SciTech Connect (OSTI)

This summary presents results obtained from a preliminary analysis of gas behavior and oxide fuel response during an LMFBR operational transient. The DiMelfi and Deitrich model is extrapolated to operational transient regimes to delineate brittle versus ductile fuel response modes. All pertinent parameters necessary for application of the DiMelfi and Deitrich model were obtained from the LIFE-3 code.

Liu, Y.Y.

1983-01-01T23:59:59.000Z

78

The export responsiveness of the Argentine grain export marketing system: a constant market share analysis  

E-Print Network [OSTI]

THE EXPORT RESPONSIVENESS OF THE ARGENTINE GRAIN EXPORT MARKET NG SYSTEM: A CONSTANT MARKET SHARE ANALYSIS A Thesis by SCOTT ALAN MILLIMET Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE May 1982 Ma) or Subject: Agricultural Economics THE EXPORT RESPONSIVENESS OF THE ARGENTINE GRAIN EXPORT MARKETING SYSTEM: A CONSTANT MARKET SHARE ANALYSIS A Thesis by SCOTT ALAN MILLIMET Approved as to style...

Millimet, Scott Alan

1982-01-01T23:59:59.000Z

79

Video-aided analysis of zebrafish locomotion and anxiety-related behavioral responses  

E-Print Network [OSTI]

1 Video-aided analysis of zebrafish locomotion and anxiety-related behavioral responses Peter R tools that accurately record their behavioral phenotypes. Video-aided analysis of zebrafish behavior and consistent video-aided measurements of zebrafish locomotion and anxiety-related behavior. #12;3 Introduction

Kalueff, Allan V.

80

Single-wave-number representation of nonlinear energy spectrum in elastic-wave turbulence of the Föppl–von Kármán equation: Energy decomposition analysis and energy budget  

Science Journals Connector (OSTI)

A single-wave-number representation of a nonlinear energy spectrum, i.e., a stretching-energy spectrum, is found in elastic-wave turbulence governed by the Föppl–von Kármán (FvK) equation. The representation enables energy decomposition analysis in the wave-number space and analytical expressions of detailed energy budgets in the nonlinear interactions. We numerically solved the FvK equation and observed the following facts. Kinetic energy and bending energy are comparable with each other at large wave numbers as the weak turbulence theory suggests. On the other hand, stretching energy is larger than the bending energy at small wave numbers, i.e., the nonlinearity is relatively strong. The strong correlation between a mode ak and its companion mode a?k is observed at the small wave numbers. The energy is input into the wave field through stretching-energy transfer at the small wave numbers, and dissipated through the quartic part of kinetic-energy transfer at the large wave numbers. Total-energy flux consistent with energy conservation is calculated directly by using the analytical expression of the total-energy transfer, and the forward energy cascade is observed clearly.

Naoto Yokoyama and Masanori Takaoka

2014-12-08T23:59:59.000Z

Note: This page contains sample records for the topic "response spectrum 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

Single-wavenumber Representation of Nonlinear Energy Spectrum in Elastic-Wave Turbulence of {F}öppl-von {K}ármán Equation: Energy Decomposition Analysis and Energy Budget  

E-Print Network [OSTI]

A single-wavenumber representation of nonlinear energy spectrum, i.e., stretching energy spectrum is found in elastic-wave turbulence governed by the F\\"oppl-von K\\'arm\\'an (FvK) equation. The representation enables energy decomposition analysis in the wavenumber space, and analytical expressions of detailed energy budget in the nonlinear interactions are obtained for the first time in wave turbulence systems. We numerically solved the FvK equation and observed the following facts. Kinetic and bending energies are comparable with each other at large wavenumbers as the weak turbulence theory suggests. On the other hand, the stretching energy is larger than the bending energy at small wavenumbers, i.e., the nonlinearity is relatively strong. The strong correlation between a mode $a_{\\bm{k}}$ and its companion mode $a_{-\\bm{k}}$ is observed at the small wavenumbers. Energy transfer shows that the energy is input into the wave field through stretching-energy transfer at the small wavenumbers, and dissipated through the quartic part of kinetic-energy transfer at the large wavenumbers. A total-energy flux consistent with the energy conservation is calculated directly by using the analytical expression of the total-energy transfer, and the forward energy cascade is observed clearly.

Naoto Yokoyama; Masanori Takaoka

2014-12-09T23:59:59.000Z

82

Plant Odor Analysis of Potato: Response of Guatemalan Moth to Above- and Belowground Potato Volatiles  

Science Journals Connector (OSTI)

Plant Odor Analysis of Potato: Response of Guatemalan Moth to Above- and Belowground Potato Volatiles ... Potatoes were planted in fertilized and limed peat soil (NPK 180:90:195 g/m3; Hydro Agri AB, Landskrona, Sweden) in 5-L plastic pots. ...

Miriam Frida Karlsson; Göran Birgersson; Alba Marina Cotes Prado; Felipe Bosa; Marie Bengtsson; Peter Witzgall

2009-06-04T23:59:59.000Z

83

Analysis of Fish Response to Flows in the 1991 Pasco Flume Experiments  

E-Print Network [OSTI]

1 Analysis of Fish Response to Flows in the 1991 Pasco Flume Experiments by James J. Anderson. The hypothesis of the study is that low fish guidance efficiency (FGE) at Columbia River dams may, in part, be due to fish diving when they encounter changes in water velocities. This behavior would cause fish

Washington at Seattle, University of

84

Time-domain Fatigue Response and Reliability Analysis of Offshore Wind Turbines with  

E-Print Network [OSTI]

Time-domain Fatigue Response and Reliability Analysis of Offshore Wind Turbines with Emphasis of offshore wind turbines Defense: 09.12.2012 2012 - : Structural Engineer in Det Norske Veritas (DNV) 2007 of the drive train of an on-land wind turbine under dynamic wind loads. The main tasks of this study are to

Nørvåg, Kjetil

85

A Structural Analysis of Vehicle Design Responses to Corporate Average Fuel Economy Policy  

E-Print Network [OSTI]

sensitive to fuel prices than to CAFE standards, with the 2007 average fuel price implying that current CAFE09-0588 A Structural Analysis of Vehicle Design Responses to Corporate Average Fuel Economy Policy, Michalek, and Hendrickson 1 ABSTRACT The U.S. Corporate Average Fuel Economy (CAFE) regulations, which aim

Michalek, Jeremy J.

86

Transient Response of the Hadley Centre Coupled Ocean-Atmosphere Model to Increasing Carbon Dioxide. Part III: Analysis of Global-Mean Response Using Simple Models  

Science Journals Connector (OSTI)

The roles of surface, atmospheric, and oceanic feedbacks in controlling the global-mean transient response of a coupled ocean-atmosphere general circulation model to increasing carbon dioxide are investigated. The analysis employs a four-box ...

J. M. Murphy

1995-03-01T23:59:59.000Z

87

Energy Spectrum | Open Energy Information  

Open Energy Info (EERE)

Product: Brooklyn-based energy management conslutants with services including demand response, load control, cogeneration and rate analysis. Coordinates: 42.852755,...

88

Multivariate analysis and prediction of wind turbine response to varying wind field characteristics based on machine learning  

E-Print Network [OSTI]

Multivariate analysis and prediction of wind turbine response to varying wind field characteristics characteristics have a significant impact on the structural response and the lifespan of wind turbines. This paper presents a machine learning approach towards analyzing and predicting the response of wind turbine

Stanford University

89

Temporal and spatial scaling of hydraulic response to recharge in fractured aquifers: Insights from a frequency domain analysis  

E-Print Network [OSTI]

Temporal and spatial scaling of hydraulic response to recharge in fractured aquifers: Insights from investigate the hydraulic response to recharge of a fractured aquifer, using a frequency domain approach scaling of hydraulic response to recharge in fractured aquifers: Insights from a frequency domain analysis

Paris-Sud XI, Université de

90

Characteristics of identifying linear dynamic models from impulse response data using Prony analysis  

SciTech Connect (OSTI)

The purpose of the study was to investigate the characteristics of fitting linear dynamic models to the impulse response of oscillatory dynamic systems using Prony analysis. Many dynamic systems exhibit oscillatory responses with multiple modes of oscillations. Although the underlying dynamics of such systems are often nonlinear, it is frequently possible and very useful to represent the system operating about some set point with a linear model. Derivation of such linear models can be done using two basic approaches: model the system using theoretical derivations and some linearization method such as a Taylor series expansion; or use a curve-fitting technique to optimally fit a linear model to specified system response data. Prony analysis belongs to the second class of system modeling because it is a method of fitting a linear model to the impulse response of a dynamic system. Its parallel formulation inherently makes it well suited for fitting models to oscillatory system data. Such oscillatory dynamic effects occur in large synchronous-generator-based power systems in the form of electromechanical oscillations. To study and characterize these oscillatory dynamics, BPA has developed computer codes to analyze system data using Prony analysis. The objective of this study was to develop a highly detailed understanding of the properties of using Prony analysis to fit models to systems with characteristics often encountered in power systems. This understanding was then extended to develop general rules-of-thumb'' for using Prony analysis. The general characteristics were investigated by performing fits to data from known linear models under controlled conditions. The conditions studied include various mathematical solution techniques; different parent system configurations; and a large variety of underlying noise characteristics.

Trudnowski, D.J.

1992-12-01T23:59:59.000Z

91

Characteristics of identifying linear dynamic models from impulse response data using Prony analysis  

SciTech Connect (OSTI)

The purpose of the study was to investigate the characteristics of fitting linear dynamic models to the impulse response of oscillatory dynamic systems using Prony analysis. Many dynamic systems exhibit oscillatory responses with multiple modes of oscillations. Although the underlying dynamics of such systems are often nonlinear, it is frequently possible and very useful to represent the system operating about some set point with a linear model. Derivation of such linear models can be done using two basic approaches: model the system using theoretical derivations and some linearization method such as a Taylor series expansion; or use a curve-fitting technique to optimally fit a linear model to specified system response data. Prony analysis belongs to the second class of system modeling because it is a method of fitting a linear model to the impulse response of a dynamic system. Its parallel formulation inherently makes it well suited for fitting models to oscillatory system data. Such oscillatory dynamic effects occur in large synchronous-generator-based power systems in the form of electromechanical oscillations. To study and characterize these oscillatory dynamics, BPA has developed computer codes to analyze system data using Prony analysis. The objective of this study was to develop a highly detailed understanding of the properties of using Prony analysis to fit models to systems with characteristics often encountered in power systems. This understanding was then extended to develop general ``rules-of-thumb`` for using Prony analysis. The general characteristics were investigated by performing fits to data from known linear models under controlled conditions. The conditions studied include various mathematical solution techniques; different parent system configurations; and a large variety of underlying noise characteristics.

Trudnowski, D.J.

1992-12-01T23:59:59.000Z

92

Analysis and fitting of an SIR model with host response to infection load for a plant disease  

Science Journals Connector (OSTI)

...model fitting to field data and analysis of model...response to the amount (load) of parasite infection...model fitting to field data and analysis of model...response to the amount (load) of parasite infection...plant. Nonlinear loads were introduced to...estimation from the field data Phil. rans. R...

1997-01-01T23:59:59.000Z

93

A NON-LTE ANALYSIS OF THE HOT SUBDWARF O STAR BD+28 Degree-Sign 4211. I. THE UV SPECTRUM  

SciTech Connect (OSTI)

We present a detailed analysis of the UV spectrum of the calibration star BD+28 Degree-Sign 4211 using high-quality spectra obtained with the Hubble Space Telescope and Far-Ultraviolet Spectroscopic Explorer satellites. To this aim, we compare quantitatively the observed data with model spectra obtained from state-of-the-art non-LTE metal line-blanketed model atmospheres and synthetic spectra calculated with TLUSTY and SYNSPEC. We thus determine in a self-consistent way the abundances of 11 elements with well-defined lines in the UV, namely those of C, N, O, F, Mg, Si, P, S, Ar, Fe, and Ni. The derived abundances range from about solar to 1/10 solar. We find that the overall quality of the derived spectral fits is very satisfying. Our spectral analysis can be used to constrain rather tightly the effective temperature of BD+28 Degree-Sign 4211 to a value of T{sub eff} = 82, 000 {+-} 5000 K. We also estimate conservatively that its surface gravity falls in the range log g = 6.2{sub -0.1}{sup +0.3}. Assuming that the Hipparcos measurement for BD+28 Degree-Sign 4211 is fully reliable and that our model atmospheres are reasonably realistic, we can reconcile our spectroscopic constraints with the available parallax measurement only if the mass of BD+28 Degree-Sign 4211 is significantly less than the canonical value of 0.5 M{sub Sun} for a representative post-extended horizontal branch star.

Latour, M.; Fontaine, G.; Brassard, P. [Departement de Physique, Universite de Montreal, Succ. Centre-Ville, C.P. 6128, Montreal, QC H3C 3J7 (Canada); Chayer, P., E-mail: marilyn@astro.umontreal.ca [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)

2013-08-20T23:59:59.000Z

94

Live Cell Imaging and in situ analysis of cellular responses to DNA doublestrand  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Live Cell Imaging and in situ analysis of cellular responses to DNA double- Live Cell Imaging and in situ analysis of cellular responses to DNA double- strand breaks in mammalian cells. David J. Chen Division of Molecular Radiation Biology, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas TX 75390 The integrity of the human genome is constantly threatened by internal as well as external factors with the propensity to cause DNA damage. Of the various types of DNA damage that can occur within the mammalian cell nucleus, the DNA double strand break (DSB) is perhaps the most dangerous. Estimates put the number of endogenous DSBs anywhere between 10-100 per nucleus per day. A direct link between DSBs and cancer has been surmised by researchers based upon the fact that many cancer-predisposition

95

A model combining spectrum standardization and dominant factor based partial least square method for carbon analysis in coal by laser-induced breakdown spectroscopy  

E-Print Network [OSTI]

Successful quantitative measurement of carbon content in coal using laser-induced breakdown spectroscopy (LIBS) is suffered from relatively low precision and accuracy. In the present work, the spectrum standardization method was combined with the dominant factor based partial least square (PLS) method to improve the measurement accuracy of carbon content in coal by LIBS. The combination model employed the spectrum standardization method to convert the carbon line intensity into standard state for more accurately calculating the dominant carbon concentration, and then applied PLS with full spectrum information to correct the residual errors. The combination model was applied to the measurement of carbon content for 24 bituminous coal samples. The results demonstrated that the combination model could further improve the measurement accuracy compared with both our previously established spectrum standardization model and dominant factor based PLS model using spectral area normalized intensity for the dominant fa...

Li, Xiongwei; Fu, Yangting; Li, Zheng; Ni, Weidou

2014-01-01T23:59:59.000Z

96

NREL Spectrum of Clean Energy Innovation (Brochure)  

SciTech Connect (OSTI)

This brochure describes the NREL Spectrum of Clean Energy Innovation, which includes analysis and decision support, fundamental science, market relevant research, systems integration, testing and validation, commercialization and deployment. Through deep technical expertise and an unmatched breadth of capabilities, the National Renewable Energy Laboratory (NREL) leads an integrated approach across the spectrum of renewable energy innovation. From scientific discovery to accelerating market deployment, NREL works in partnership with private industry to drive the transformation of our nation's energy systems. NREL integrates the entire spectrum of innovation, including fundamental science, market relevant research, systems integration, testing and validation, commercialization, and deployment. Our world-class analysis and decision support informs every point on the spectrum. The innovation process at NREL is inter-dependent and iterative. Many scientific breakthroughs begin in our own laboratories, but new ideas and technologies may come to NREL at any point along the innovation spectrum to be validated and refined for commercial use.

Not Available

2011-09-01T23:59:59.000Z

97

Analysis of Dose Response for Circulatory Disease After Radiotherapy for Benign Disease  

SciTech Connect (OSTI)

Purpose: To assess the shape of the dose-response for various circulatory disease endpoints, and modifiers by age and time since exposure. Methods and Materials: This was an analysis of the US peptic ulcer data testing for heterogeneity of radiogenic risk by circulatory disease endpoint (ischemic heart, cerebrovascular, other circulatory disease). Results: There were significant excess risks for all circulatory disease, with an excess relative risk Gy{sup -1} of 0.082 (95% CI 0.031-0.140), and ischemic heart disease, with an excess relative risk Gy{sup -1} of 0.102 (95% CI 0.039-0.174) (both p = 0.01), and indications of excess risk for stroke. There were no statistically significant (p > 0.2) differences between risks by endpoint, and few indications of curvature in the dose-response. There were significant (p < 0.001) modifications of relative risk by time since exposure, the magnitude of which did not vary between endpoints (p > 0.2). Risk modifications were similar if analysis was restricted to patients receiving radiation, although the relative risks were slightly larger and the risk of stroke failed to be significant. The slopes of the dose-response were generally consistent with those observed in the Japanese atomic bomb survivors and in occupationally and medically exposed groups. Conclusions: There were excess risks for a variety of circulatory diseases in this dataset, with significant modification of risk by time since exposure. The consistency of the dose-response slopes with those observed in radiotherapeutically treated groups at much higher dose, as well as in lower dose-exposed cohorts such as the Japanese atomic bomb survivors and nuclear workers, implies that there may be little sparing effect of fractionation of dose or low-dose-rate exposure.

Little, Mark P., E-mail: mark.little@nih.gov [Radiation Epidemiology Branch, National Cancer Institute, Executive Plaza South, Rockville, Maryland (United States); Kleinerman, Ruth A. [Radiation Epidemiology Branch, National Cancer Institute, Executive Plaza South, Rockville, Maryland (United States)] [Radiation Epidemiology Branch, National Cancer Institute, Executive Plaza South, Rockville, Maryland (United States); Stovall, Marilyn; Smith, Susan A. [Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, Texas (United States)] [Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, Texas (United States); Mabuchi, Kiyohiko [Radiation Epidemiology Branch, National Cancer Institute, Executive Plaza South, Rockville, Maryland (United States)] [Radiation Epidemiology Branch, National Cancer Institute, Executive Plaza South, Rockville, Maryland (United States)

2012-12-01T23:59:59.000Z

98

THE COMPACT STEEP SPECTRUM AND GHZ PEAKED SPECTRUM RADIO SOURCES  

E-Print Network [OSTI]

THE COMPACT STEEP SPECTRUM AND GHZ PEAKED SPECTRUM RADIO SOURCES Christopher P. O'Dea Space@stsci.edu ABSTRACT I review the radio to X­ray properties of GHz Peaked Spectrum (GPS) and Compact Steep Spectrum The GHz Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) radio sources make up significant fractions

99

SPECTRUM OPPORTUNITY AND INTERFERENCE CONSTRAINT IN OPPORTUNISTIC SPECTRUM ACCESS  

E-Print Network [OSTI]

of the radio spec- trum? Actual spectrum usage measurements obtained by the FCC's Spectrum Policy Task Force [1SPECTRUM OPPORTUNITY AND INTERFERENCE CONSTRAINT IN OPPORTUNISTIC SPECTRUM ACCESS Qing Zhao@ece.ucdavis.edu ABSTRACT In this paper, we study two important concepts in opportunis- tic spectrum access: spectrum

Islam, M. Saif

100

Statistical and risk analysis for the measured and predicted axial response of 100 piles  

E-Print Network [OSTI]

of Committee) cu. Har y M. Coyl (Member) J rey D. Hart (Member) Donald McDonald (Head of Department) May 1986 ABSTRACT Statistical and Risk Analysis for the Measured and Predicted Axial Response of 100 Piles (December 1985) Dario Perdomo, B. S... encouragement and financial support. Sincere thanks are expressed to Dr. Jean-Louis Briaud and Nr. Larry Tucker i'or their guidance and advice throughout the course of this research. The assistance of Dr. Harry Coyle and Dr. Jeffrey Hart are also...

Perdomo, Dario

1986-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "response spectrum 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

An Analysis of the Broadband (22-3900 MHz) Radio Spectrum of HB3 (G132.7+1.3): The Detection of Thermal Radio Emission from an Evolved Supernova Remnant?  

E-Print Network [OSTI]

We present an analysis of the broadband radio spectrum (from 22 to 3900 MHz) of the Galactic supernova remnant (SNR) HB3 (G132.7+1.3). Published observations have revealed that a curvature is present in the radio spectrum of this SNR, indicating that a single synchrotron component appears is insufficient to adequately fit the spectrum. We present here a fit to this spectrum using a combination of a synchrotron component and a thermal bremsstrahlung component. We discuss properties of this latter component and estimate the ambient density implied by the presence of this component to be n \\~ 10 cm^-3. We have also analyzed extracted X-ray spectra from archived {\\it ASCA} GIS observations of different regions of HB3 to obtain independent estimates of the density of the surrounding interstellar medium (ISM). From this analysis, we have derived electron densities of 0.1-0.4 f^-1/2 cm^-3 for the ISM for the three different regions of the SNR, where f is the volume filling factor. By comparing these density estimates with the estimate derived from the thermal bremsstrahlung component, we argue that the radio thermal bremsstrahlung emission is emitted from a thin shell enclosing HB3. The presence of this thermal bremsstrahlung component in the radio spectrum of HB3 suggests that this SNR is in fact interacting with an adjacent molecular cloud associated with the HII region W3. By extension, we argue that the presence of thermal emission at radio wavelengths may be a useful tool for identifying interactions between SNRs and molecular clouds, and for estimating the ambient density near SNRs using radio continuum data.

D. Urosevic; T. Pannuti; D. Leahy

2006-12-22T23:59:59.000Z

102

Analysis of Open Automated Demand Response Deployments in California and Guidelines to Transition to Industry Standards  

E-Print Network [OSTI]

to  Automated  Demand   Response  and  the  OpenADR  ®  Automated  Demand  Response  Program.   https://Data  for  Automated  Demand  Response  in  Commercial  

Ghatikar, Girish

2014-01-01T23:59:59.000Z

103

Global Metabolomic and Network analysis of Escherichia coli Responses to Exogenous Biofuels  

Science Journals Connector (OSTI)

Although synthetic biology progress has made it possible to produce various biofuels in more user-friendly hosts, such as Escherichia coli, the large-scale biofuel production in these non-native systems is still challenging, mostly due to the very low tolerance of these non-native hosts to the biofuel toxicity. ... The findings enhanced our understanding of E. coli responses to exogenous biofuels and also demonstrated the effectiveness of the metabolomic and network analysis in identifying key targets for biofuel tolerance. ... For metabolomic analysis, three independent cultivations for both control (no addition of biofuels) and biofuel-treated experiments (under selected concentrations) were conducted, and cells were collected at four sampling time points, 1, 2.5, 4, and 7 h, roughly corresponding to early exponential, late-exponential, transition, and stationary phases of the cell growth, respectively (Figure 1). ...

Jiangxin Wang; Lei Chen; Xiaoxu Tian; Lianju Gao; Xiangfeng Niu; Mengliang Shi; Weiwen Zhang

2013-09-09T23:59:59.000Z

104

Intelligent Spectrum Sensor Radio.  

E-Print Network [OSTI]

??A cognitive radio is a radio with built-in intelligence that makes it able to utilize the radio frequency spectrum more efficiently by adapting to the… (more)

Mian, Omer

2008-01-01T23:59:59.000Z

105

In Depth Analysis of AVCOAT TPS Response to a Reentry Flow  

SciTech Connect (OSTI)

Modeling of the high altitude portion of reentry vehicle trajectories with DSMC or statistical BGK solvers requires accurate evaluation of the boundary conditions at the ablating TPS surface. Presented in this article is a model which takes into account the complex ablation physics including the production of pyrolysis gases, and chemistry at the TPS surface. Since the ablation process is time dependent the modeling of the material response to the high energy reentry flow starts with the solution of the rarefied flow over the vehicle and then loosely couples with the material response. The objective of the present work is to carry out conjugate thermal analysis by weakly coupling a flow solver to a material thermal response model. The latter model solves the one dimensional heat conduction equation accounting for the pyrolysis process that takes place in the reaction zone of an ablative thermal protection system (TPS) material. An estimate of the temperature range within which the pyrolysis reaction (decomposition and volatilization) takes place is obtained from Ref. [1]. The pyrolysis reaction results in the formation of char and the release of gases through the porous charred material. These gases remove additional amount of heat as they pass through the material, thus cooling the material (the process known as transpiration cooling). In the present work, we incorporate the transpiration cooling model in the material thermal response code in addition to the pyrolysis model. The flow in the boundary layer and in the vicinity of the TPS material is in the transitional flow regime. Therefore, we use a previously validated statistical BGK method to model the flow physics in the vicinity of the micro-cracks, since the BGK method allows simulations of flow at pressures higher than can be computed using DSMC.

Titov, E. V.; Kumar, Rakesh; Levin, D. A. [Pennsylvania State University, University Park, PA 16802 (United States)

2011-05-20T23:59:59.000Z

106

A structural analysis of vehicle design responses to Corporate Average Fuel Economy policy  

Science Journals Connector (OSTI)

The US Corporate Average Fuel Economy (CAFE) regulations are intended to influence automaker vehicle design and pricing choices. CAFE policy has been in effect for the past three decades, and new legislation has raised standards significantly. We present a structural analysis of automaker responses to generic CAFE policies. We depart from prior CAFE analyses by focusing on vehicle design responses in long-run oligopolistic equilibrium, and we view vehicles as differentiated products, taking demand as a general function of price and product attributes. We find that under general cost, demand, and performance functions, single-product profit maximizing firm responses to CAFE standards follow a distinct pattern: firms ignore CAFE when the standard is low, treat CAFE as a vehicle design constraint for moderate standards, and violate CAFE when the standard is high. Further, the point and extent of first violation depends upon the penalty for violation, and the corresponding vehicle design is independent of further standard increases. Thus, increasing CAFE standards will eventually have no further impact on vehicle design if the penalty for violation is also not increased. We implement a case study by incorporating vehicle physics simulation, vehicle manufacturing and technology cost models, and a mixed logit demand model to examine equilibrium powertrain design and price decisions for a fixed vehicle body. Results indicate that equilibrium vehicle design is not bound by current CAFE standards, and vehicle design decisions are directly determined by market competition and consumer preferences. We find that with increased fuel economy standards, a higher violation penalty than the current stagnant penalty is needed to cause firms to increase their design fuel economy at equilibrium. However, the maximum attainable improvement can be modest even if the penalty is doubled. We also find that firms’ design responses are more sensitive to variation in fuel prices than to CAFE standards, within the examined ranges.

Ching-Shin Norman Shiau; Jeremy J. Michalek; Chris T. Hendrickson

2009-01-01T23:59:59.000Z

107

Radiation detector spectrum simulator  

DOE Patents [OSTI]

A small battery operated nuclear spectrum simulator having a noise source nerates pulses with a Gaussian distribution of amplitudes. A switched dc bias circuit cooperating therewith generates several nominal amplitudes of such pulses and a spectral distribution of pulses that closely simulates the spectrum produced by a radiation source such as Americium 241.

Wolf, Michael A. (Los Alamos, NM); Crowell, John M. (Los Alamos, NM)

1987-01-01T23:59:59.000Z

108

Radiation detector spectrum simulator  

DOE Patents [OSTI]

A small battery operated nuclear spectrum simulator having a noise source generates pulses with a Gaussian distribution of amplitudes. A switched dc bias circuit cooperating therewith to generate several nominal amplitudes of such pulses and a spectral distribution of pulses that closely simulates the spectrum produced by a radiation source such as Americium 241.

Wolf, M.A.; Crowell, J.M.

1985-04-09T23:59:59.000Z

109

Modeling and analysis of the latent period of osteosarcomas induced by incorporated 239Pu: The role of immune responses  

Science Journals Connector (OSTI)

This paper considers the utility of a stochastic model of carcinogenesis, proposed earlier by Yakovlev and Polig, in quantitative analysis of the incidence of radiation-induced osteosarcomas in beagels injected with various amounts of ^2^3^9Pu. The original ... Keywords: Bone tumors, Carcinogenesis models, Immune response, Internal irradiation, Survival analysis

A. D. Tsodikov; F. Bruenger; R. D. Lloyd; S. Miller; E. Polig; A. Yu. Yakovlev

2001-06-01T23:59:59.000Z

110

Artificial Neural Networks and quadratic Response Surfaces for the functional failure analysis of a thermal-hydraulic passive system  

E-Print Network [OSTI]

] have been widely used in reliability analysis and risk assessment [16]. Recently, advanced samplingArtificial Neural Networks and quadratic Response Surfaces for the functional failure analysis decay heat removal system of a Gas-cooled Fast Reactor (GFR). Keywords: epistemic uncertainties, passive

Paris-Sud XI, Université de

111

Parametric Adaptive Spectrum Sensing Framework for Dynamic Spectrum Access Networks  

E-Print Network [OSTI]

- ture for dynamic spectrum sensing. In our approach, the radio learns the statistics of the channel Spectrum Sensing Architecture The proposed PASS architecture enables the radio to adapt its spectrumParametric Adaptive Spectrum Sensing Framework for Dynamic Spectrum Access Networks Dinesh Datla

Kansas, University of

112

Decentralized demand–supply matching using community microgrids and consumer demand response: A scenario analysis  

Science Journals Connector (OSTI)

Abstract Developing countries constantly face the challenge of reliably matching electricity supply to increasing consumer demand. The traditional policy decisions of increasing supply and reducing demand centrally, by building new power plants and/or load shedding, have been insufficient. Locally installed microgrids along with consumer demand response can be suitable decentralized options to augment the centralized grid based systems and plug the demand–supply gap. The objectives of this paper are to: (1) develop a framework to identify the appropriate decentralized energy options for demand–supply matching within a community, and, (2) determine which of these options can suitably plug the existing demand–supply gap at varying levels of grid unavailability. A scenario analysis framework is developed to identify and assess the impact of different decentralized energy options at a community level and demonstrated for a typical urban residential community – Vijayanagar, Bangalore in India. A combination of LPG based CHP microgrid and proactive demand response by the community is the appropriate option that enables the Vijayanagar community to meet its energy needs 24/7 in a reliable, cost-effective manner. The paper concludes with an enumeration of the barriers and feasible strategies for the implementation of community microgrids in India based on stakeholder inputs.

Kumudhini Ravindra; Parameshwar P. Iyer

2014-01-01T23:59:59.000Z

113

Sensitivity Analysis of the Thermal Response of 9975 Packaging Using Factorial Design Methods  

SciTech Connect (OSTI)

A method is presented for using the statistical design of experiment (2{sup k} Factorial Design) technique in the sensitivity analysis of the thermal response (temperature) of the 9975 radioactive material packaging where multiple thermal properties of the impact absorbing and fire insulating material Celotex and certain boundary conditions are subject to uncertainty. 2{sup k} Factorial Design method is very efficient in the use of available data and is capable of analyzing the impact of main variables (Factors) and their interactions on the component design. The 9975 design is based on detailed finite element (FE) analyses and extensive proof testing to meet the design requirements given in 10CFR71 [1]. However, the FE analyses use Celotex thermal properties that are based on published data and limited experiments. Celotex is an orthotropic material that is used in the home building industry. Its thermal properties are prone to variation due to manufacturing and fabrication processes, and due to long environmental exposure. This paper will evaluate the sensitivity of variations in thermal conductivity of the Celotex, convection coefficient at the drum surface, and drum emissivity (herein called Factors) on the thermal response of 9975 packaging under Normal Conditions of Transport (NCT). Application of this methodology will ascertain the robustness of the 9975 design and it can lead to more specific and useful understanding of the effects of various Factors on 9975 performance.

Gupta, Narendra K.

2005-10-31T23:59:59.000Z

114

Analysis of tracer responses in the BULLION Forced-Gradient Experiment at Pahute Mesa, Nevada  

SciTech Connect (OSTI)

This report presents an analysis of the tracer data from the BULLION forced-gradient experiment (FGE) conducted on Pahute Mesa at the Nevada Test Site from June 2, 1997 through August 28, 1997, for the Underground Test Area (UGTA) Program. It also serves to document the polystyrene microsphere data from the FGE. The FGE involved the injection of solute and colloid tracers into wells ER-20-6 No. 1 and ER-20-6 No. 2 while ER-20-6 No. 3 was pumped at approximately 116 gallons per minute (gpm). The experimental configuration and test design are described briefly in this report; more details are provided elsewhere (IT, 1996, 1997, 1998). The tracer responses in the various wells yielded valuable information about transport processes such as longitudinal dispersion, matrix diffusion and colloid transport in the hydrogeologic system in the vicinity of the BULLION nuclear test cavity. Parameter values describing these processes are derived from the semi-analytical model interpretations presented in this report. A companion report (IT, 1998) presents more detailed numerical modeling interpretations of the solute tracer responses.

Paul W. Reimus; Marc J. Haga

1999-10-01T23:59:59.000Z

115

An analysis of asymmetric demand response to price changes: The case of local telephone calls  

Science Journals Connector (OSTI)

Asymmetric demand responses to price changes are not an observable ... empirical studies generally support the theory of asymmetric demand responses. We construct a dynamic model based on...

Miles O. Bidwell Jr.; Bruce X. Wang; J. Douglas Zona

1995-11-01T23:59:59.000Z

116

BNL | ICS Spectrum  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Demonstration of Mass-shift and High Harmonics in ICS X-ray Spectrum The recent improvements in the ATF's CO2 laser, in particular, using CO2 isotopes for the picosecond pulse...

117

Sensitivity analysis of reactivity responses using one-dimensional discrete ordinates and three-dimensional Monte Carlo methods  

SciTech Connect (OSTI)

The TSUNAMI computational sequences currently in the SCALE 5 code system provide an automated approach to performing sensitivity and uncertainty analysis for eigenvalue responses, using either one-dimensional discrete ordinates or three-dimensional Monte Carlo methods. This capability has recently been expanded to address eigenvalue-difference responses such as reactivity changes. This paper describes the methodology and presents results obtained for an example advanced CANDU reactor design. (authors)

Williams, M. L.; Gehin, J. C.; Clarno, K. T. [Oak Ridge National Laboratory, Bldg. 5700, P.O. Box 2008, Oak Ridge, TN 37831-6170 (United States)

2006-07-01T23:59:59.000Z

118

Utilization and Fairness in Spectrum Assignment for Opportunistic Spectrum Access  

E-Print Network [OSTI]

. INTRODUCTION Wireless devices are becoming ubiquitous, placing increas­ ing stress on the fixed radio spectrum by software defined radio (SDR) technology [5], [15], [23], Open Spectrum allows unlicensed (secondary) users1 Utilization and Fairness in Spectrum Assignment for Opportunistic Spectrum Access Chunyi Peng

Zhao, Ben Y.

119

Utilization and Fairness in Spectrum Assignment for Opportunistic Spectrum Access  

E-Print Network [OSTI]

. INTRODUCTION Wireless devices are becoming ubiquitous, placing increas- ing stress on the fixed radio spectrum by software defined radio (SDR) technology [5], [16], [24], Open Spectrum allows unlicensed (secondary) users1 Utilization and Fairness in Spectrum Assignment for Opportunistic Spectrum Access Chunyi Peng

Almeroth, Kevin C.

120

An Approximate Truthfulness Motivated Spectrum Auction for Dynamic Spectrum Access  

E-Print Network [OSTI]

Radio Spectrum is a critical but scarce resource for wireless communications. Traditionally of spectrum allocation approach, each licensed user has exclusive right for the allocated spectrum, thus facilities as well as the explosive growth of novel wireless services, the demand for radio spectrum

Zhou, Yuanyuan

Note: This page contains sample records for the topic "response spectrum 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

Efficient Dynamic Spectrum Sharing Through Rate Compensation and Spectrum Handoff  

E-Print Network [OSTI]

Abstract--In this work, we propose a heuristic for dynamic spectrum sharing in cognitive radio networks licensed channels available for opportunistic spectrum access. Each SU is equipped with n wEfficient Dynamic Spectrum Sharing Through Rate Compensation and Spectrum Handoff Adisorn

Paris-Sud XI, Université de

122

Radio and Spectrum Management | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Radio and Spectrum Management Radio and Spectrum Management DOE Radio and Spectrum Workshop 43.pdf More Documents & Publications ICAM Workshop Ad Hoc Meetings Spectrum Technology...

123

A threat-rigidity analysis of the Apache Software Foundation's response to reported server security issues  

E-Print Network [OSTI]

There exists a broad body of literature documenting organizational responses to competitive threats, including those responses which fit into the threat-rigidity hypothesis. The purpose of this thesis is to investigate how ...

Shapira, Yoav

2006-01-01T23:59:59.000Z

124

Corporate social responsibility in Brazil : a comparative analysis of two paper companies  

E-Print Network [OSTI]

If being socially responsible can result in short or long-term economic benefits, then why do not all companies adopt corporate social responsibility (CSR) practices? This thesis draws on general assumptions from illustrative ...

Nascimento, Ana Paula M. do, 1966-

2004-01-01T23:59:59.000Z

125

Gene selection using rough set based on neighborhood for the analysis of plant stress response  

Science Journals Connector (OSTI)

Abstract Gene selection and sample classification based on gene expression data are important research trends in bioinformatics. It is very difficult to select significant genes closely related to classification because of the high dimension and small sample size of gene expression data. Rough set based on neighborhood has been successfully applied to gene selection, as it selects attributes without redundancy and deals with numerical attributes directly. Construction of neighborhoods, approximation operators and attribute reduction algorithm are three key components in this gene selection approach. In this study, a novel neighborhood named intersection neighborhood for numerical data was defined. The performances of two kinds of approximation operators were compared on gene expression data. A significant gene selection algorithm, which was applied to the analysis of plant stress response, was proposed by using positive region and gene ranking, and then this algorithm with thresholds optimization for intersection neighborhood was extended. The performance of the proposed algorithm, along with a comparison with other related methods, classical algorithms and rough set methods, was analyzed. The results of experiments on four data sets showed that intersection neighborhood was more flexible to adapt to the data with various structure, and approximation operator based on elementary set was more suitable for this application than that based on element. That was to say that the proposed algorithms were effective, as they could select significant gene subsets without redundancy and achieve high classification accuracy.

Jun Meng; Jing Zhang; Rui Li; Yushi Luan

2014-01-01T23:59:59.000Z

126

Analyzing the temporal variation of wind turbine responses using Gaussian Mixture Model and Gaussian Discriminant Analysis  

E-Print Network [OSTI]

1 Analyzing the temporal variation of wind turbine responses using Gaussian Mixture Model characteristics have a significant impact on the structural response and the lifespan of wind turbines. This paper presents a machine learning approach towards analyzing and predicting the response of a wind turbine

Stanford University

127

NREL Spectrum of Innovation  

SciTech Connect (OSTI)

There are many voices calling for a future of abundant clean energy. The choices are difficult and the challenges daunting. How will we get there? The National Renewable Energy Laboratory integrates the entire spectrum of innovation including fundamental science, market relevant research, systems integration, testing and validation, commercialization and deployment. The innovation process at NREL is interdependent and iterative. Many scientific breakthroughs begin in our own laboratories, but new ideas and technologies come to NREL at any point along the innovation spectrum to be validated and refined for commercial use.

None

2011-01-01T23:59:59.000Z

128

Using cluster analysis to identify patterns in students’ responses to contextually different conceptual problems  

Science Journals Connector (OSTI)

This study examined the evolution of student responses to seven contextually different versions of two Force Concept Inventory questions in an introductory physics course at the University of Arkansas. The consistency in answering the closely related questions evolved little over the seven-question exam. A model for the state of student knowledge involving the probability of selecting one of the multiple-choice answers was developed. Criteria for using clustering algorithms to extract model parameters were explored and it was found that the overlap between the probability distributions of the model vectors was an important parameter in characterizing the cluster models. The course data were then clustered and the extracted model showed that students largely fit into two groups both pre- and postinstruction: one that answered all questions correctly with high probability and one that selected the distracter representing the same misconception with high probability. For the course studied, 14% of the students were left with persistent misconceptions post instruction on a static force problem and 30% on a dynamic Newton’s third law problem. These students selected the answer representing the predominant misconception slightly more consistently postinstruction, indicating that the course studied had been ineffective at moving this subgroup of students nearer a Newtonian force concept and had instead moved them slightly farther away from a correct conceptual understanding of these two problems. The consistency in answering pairs of problems with varied physical contexts is shown to be an important supplementary statistic to the score on the problems and suggests that the inclusion of such problem pairs in future conceptual inventories would be efficacious. Multiple, contextually varied questions further probe the structure of students’ knowledge. To allow working instructors to make use of the additional insight gained from cluster analysis, it is our hope that the physics education research community will make these methods available though their Web sites.

John Stewart; Mayo Miller; Christine Audo; Gay Stewart

2012-10-04T23:59:59.000Z

129

Reconnection of vortex filaments and Kolmogorov spectrum  

E-Print Network [OSTI]

The energy spectrum of the 3D velocity field, induced by collapsing vortex filaments is studied. One of the aims of this work is to clarify the appearance of the Kolmogorov type energy spectrum $E(k)\\varpropto k^{-5/3}$, observed in many numerical works on discrete vortex tubes (quantized vortex filaments in quantum fluids). Usually, explaining classical turbulent properties of quantum turbulence, the model of vortex bundles, is used. This model is necessary to mimic the vortex stretching, which is responsible for the energy transfer in classical turbulence. In our consideration we do not appeal to the possible "bundle arrangement" but explore alternative idea that the turbulent spectra appear from singular solution, which describe the collapsing line at moments of reconnection. One more aim is related to an important and intensively discussed topic - a role of hydrodynamic collapse in the formation of turbulent spectra. We demonstrated that the specific vortex filament configuration generated the spectrum $E...

Nemirovskii, Sergey K

2014-01-01T23:59:59.000Z

130

Screening potato genotypes for antioxidant activity, identification of the responsible compounds, and differentiating Russet Norkotah strains using AFLP and microsatellite marker analysis  

E-Print Network [OSTI]

SCREENING POTATO GENOTYPES FOR ANTIOXIDANT ACTIVITY, IDENTIFICATION OF THE RESPONSIBLE COMPOUNDS, AND DIFFERENTIATING RUSSET NORKOTAH STRAINS USING AFLP AND MICROSATELLITE MARKER ANALYSIS A Dissertation by ANNA LOUISE HALE... FOR ANTIOXIDANT ACTIVITY, IDENTIFICATION OF THE RESPONSIBLE COMPOUNDS, AND DIFFERENTIATING RUSSET NORKOTAH STRAINS USING AFLP AND MICROSATELLITE MARKER ANALYSIS A Dissertation by ANNA LOUISE HALE Submitted to Texas A&M University in partial fulfillment...

Hale, Anna Louise

2005-02-17T23:59:59.000Z

131

Analysis and simulation of dynamic response behavior of Scots pine trees to wind loading  

Science Journals Connector (OSTI)

This paper presents an empirical approach for the decomposition, simulation, and reconstruction of wind-induced stem displacement of plantation-grown Scots ... tree motion patterns in response to non-destructive

Dirk Schindler; Hannes Fugmann; Helmut Mayer

2013-11-01T23:59:59.000Z

132

Socially Responsible Investing : a comparative analysis of environmental, social, governance, reputational and labor factors  

E-Print Network [OSTI]

Socially Responsible Investing (SRI) aims to deliver competitive investment returns while fostering social good. It aims achieves its objective by including a firm's corporate social performance (CSP) in its investment d ...

Balasubramaniam, Arun, S.M. Massachusetts Institute of Technology

2011-01-01T23:59:59.000Z

133

Ethylene Insensitivity in Maize: Analysis of Ethylene Receptors and the Ethylene Response in Maize  

E-Print Network [OSTI]

and Ecker, J.R. (2002) Ethylene Biosynthesis and Signalingand Kende, H. (2000) Ethylene: a gaseous signal molecule inE.M. (1993) Arabidopsis Ethylene- Response Gene ETR1:

Chen, Juifen

2011-01-01T23:59:59.000Z

134

Ethylene Insensitivity in Maize: Analysis of Ethylene Receptors and the Ethylene Response in Maize.  

E-Print Network [OSTI]

??The biological role of ethylene, H2C=CH2, was first identified as a plant hormone responsible for leaf drop from the observation that plants relatively close to… (more)

Chen, Juifen

2011-01-01T23:59:59.000Z

135

A meta-analysis of single case research studies on aided augmentative and alternative communication systems with individuals with autism spectrum disorders  

E-Print Network [OSTI]

behavioral outcomes, summary of the results, and overall quality of the research. The teaching method implemented included three categories. Child-led involved Running Head: META-ANALYSIS OF AAC 11 instruction that began only when the child initiated... generally fit the criteria for child-led, however, instruction took place during natural activities (e.g., free play, snack time); the adult did not strictly control access to the stimuli. Teacher-led involved one-on-one instruction in a contrived...

Ganz, Jennifer B.; Earles-Vollrath, Theresa L.; Heath, Amy K.; Parker, Richard; Rispoli, Mandy J.; Duran, Jaime

2012-01-01T23:59:59.000Z

136

Spectrum Mobility Games Richard Southwell  

E-Print Network [OSTI]

by allowing cognitive radio devices to opportunisti- cally access underutilized licensed spectrum while With the unprecedented growth in the number of mobile devices and wireless services, the radio frequency spectrum are widely underutilized. Cognitive radio technology has the great potential to alleviate spectrum scarcity

Huang, Jianwei

137

Hybrid spread spectrum radio system  

DOE Patents [OSTI]

Systems and methods are described for hybrid spread spectrum radio systems. A method, includes receiving a hybrid spread spectrum signal including: fast frequency hopping demodulating and direct sequence demodulating a direct sequence spread spectrum signal, wherein multiple frequency hops occur within a single data-bit time and each bit is represented by chip transmissions at multiple frequencies.

Smith, Stephen F. (London, TN) [London, TN; Dress, William B. (Camas, WA) [Camas, WA

2010-02-09T23:59:59.000Z

138

Discrete multiwavelength spectrum created  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Supramolecular structure of polymer blends Supramolecular structure of polymer blends * Macroscale self-similarity of rocks * Structure of colloidal crystals and alloys * Hydration of cement pastes * Aggregation in colloidal dispersions * Self-assembling of polymers * Mesoscopic structure of natural composites * Structure of granular powders * Morphology of colloidal reinforcing fillers * Structure and morphology of complex fluids * Rheology and morphology of hydrogels 06-G01637F/gim Moderator Decoupled poisoned hydrogen Source- detector distance 30 m Focusing premono- chromator Cooper mosaic Cu(111) crystals Monochro- mator and analyzer Si(220) channel-cut, triple-bounce crystals Bragg angle 70° Wavelength spectrum 4 Bragg

139

MGA: A gamma-ray spectrum analysis code for determining plutonium isotopic abundances. Volume 3, FORTRAN listing of the GA code  

SciTech Connect (OSTI)

Nondestructive measurements of x-ray and gamma-ray emissions can be used to determine the abundances of various actinides in a sample. Volume 1 of this report describes the methods and algorithms we have developed to determine the relative isotopic abundances of actinides in a sample, by analyzing gamma-ray spectra obtained using germanium detector systems. Volume 2 is a guide to using the MGA (Multiple Group Analysis) computer program we have written to perform plutonium isotopic analyses. This report contains a listing of the FORTRAN instructions of the code.

Gunnink, R

1991-09-01T23:59:59.000Z

140

A Database and Meta-Analysis of Ecological Responses to Flow in the South Atlantic Region  

SciTech Connect (OSTI)

Generalized and quantitative relationships between flow and ecology are pivotal to developing environmental flow standards based on socially acceptable ecological conditions. Informing management at regional scales requires compiling sufficient hydrologic and ecological sources of information, identifying information gaps, and creating a framework for hypothesis development and testing. We compiled studies of empirical and theoretical relationships between flow and ecology in the South Atlantic region (SAR) of the United States to evaluate their utility for the development of environmental flow standards. Using database searches, internet searches, and agency contacts, we gathered 186 sources of information that provided a qualitative or quantitative relationship between flow and ecology within states encompassing the SAR. A total of 109 of the 186 sources had sufficient information to support quantitative analyses. Ecological responses to natural changes in flow magnitude, frequency, and duration were highly variable regardless of the direction and magnitude of changes in flow. In contrast, the majority of ecological responses to anthropogenic-induced flow alterations were negative. Fish consistently showed negative responses to anthropogenic flow alterations whereas other ecological groups showed somewhat variable responses (e.g. macroinvertebrates and riparian vegetation) and even positive responses (e.g. algae). Fish and organic matter had sufficient sample sizes to stratify natural flow-ecology relationships by specific flow categories (e.g. high flow, baseflows) or by region (e.g. coastal plain, uplands). After stratifying relationships, we found that significant correlations existed between changes in natural flow and ecological responses. In addition, a regression tree explained 57% of the variation in fish responses to anthropogenic and natural changes in flow. Because of some ambiguity in interpreting the directionality in ecological responses, we utilized ecological gains or losses, where each represents a benefit or reduction to ecosystem services, respectively. Variables explained 49% of the variation in ecological gains and losses for all ecological groups combined. Altogether, our results suggested that the source of flow change and the ecological group of interest played primary roles in determining the direction and magnitude of ecological responses. Furthermore, our results suggest that developing broadly generalized relationships between ecology and changes in flow at a regional scale is unlikely unless relationships are placed within meaningful contexts, such as environmental flow components or by geomorphic setting.

McManamay, Ryan A [ORNL; Orth, Dr. Donald J [Virginia Polytechnic Institute and State University (Virginia Tech); Davis, Dr, Mary [Southeastern Aquatic Resources Partnership; Kauffman, John [John Kauffman LLC.

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "response spectrum 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

The angular power spectrum of NVSS radio galaxies  

E-Print Network [OSTI]

We measure the angular power spectrum of radio galaxies in the NRAO VLA Sky Survey (NVSS) using two independent methods: direct spherical harmonic analysis and maximum likelihood estimation. The results are consistent and can be understood using models for the spatial matter power spectrum and for the redshift distribution of radio galaxies at mJy flux-density levels. A good fit to the angular power spectrum can only be achieved if radio galaxies possess high bias with respect to mass fluctuations; by marginalizing over the other parameters of the model we derive a 68% confidence interval 1.53 radio galaxies and sigma_8 describes the normalization of the matter power spectrum. Our models indicate that the majority of the signal in the NVSS angular power spectrum is generated at low redshifts. Individual redshifts for the NVSS sources are thus required to alleviate projection effects and probe directly the matter power spectrum on large scales.

Chris Blake; Pedro G. Ferreira; Julian Borrill

2004-04-05T23:59:59.000Z

142

Spectrum sharing in cognitive radio networks.  

E-Print Network [OSTI]

??Years of growth in wireless communication services and conservative spectrum allocation policies by government regulators have led to spectrum scarcity. On the other hand, spectrum… (more)

Ahmed, Waqas

2012-01-01T23:59:59.000Z

143

Spectrum Policy Seminar | Department of Energy  

Energy Savers [EERE]

Policy Seminar Spectrum Policy Seminar Slide show from FCC's Public Safety and Homeland Security Bureau's presenation on spectrum policy. Spectrum Policy Seminar More Documents &...

144

A PER-BASELINE, DELAY-SPECTRUM TECHNIQUE FOR ACCESSING THE 21 cm COSMIC REIONIZATION SIGNATURE  

SciTech Connect (OSTI)

A critical challenge in measuring the power spectrum of 21 cm emission from cosmic reionization is compensating for the frequency dependence of an interferometer's sampling pattern, which can cause smooth-spectrum foregrounds to appear unsmooth and degrade the separation between foregrounds and the target signal. In this paper, we present an approach to foreground removal that explicitly accounts for this frequency dependence. We apply the delay transformation introduced in Parsons and Backer to each baseline of an interferometer to concentrate smooth-spectrum foregrounds within the bounds of the maximum geometric delays physically realizable on that baseline. By focusing on delay modes that correspond to image-domain regions beyond the horizon, we show that it is possible to avoid the bulk of smooth-spectrum foregrounds. We map the point-spread function of delay modes to k-space, showing that delay modes that are uncorrupted by foregrounds also represent samples of the three-dimensional power spectrum, and can be used to constrain cosmic reionization. Because it uses only spectral smoothness to differentiate foregrounds from the targeted 21 cm signature, this per-baseline analysis approach relies on spectrally and spatially smooth instrumental responses for foreground removal. For sufficient levels of instrumental smoothness relative to the brightness of interfering foregrounds, this technique substantially reduces the level of calibration previously thought necessary to detect 21 cm reionization. As a result, this approach places fewer constraints on antenna configuration within an array, and in particular, facilitates the adoption of configurations that are optimized for power-spectrum sensitivity. Under these assumptions, we demonstrate the potential for the Precision Array for Probing the Epoch of Reionization (PAPER) to detect 21 cm reionization at an amplitude of 10 mK{sup 2} near k {approx} 0.2 h Mpc{sup -1} with 132 dipoles in 7 months of observing.

Parsons, Aaron R.; Pober, Jonathan C. [Astronomy Department, University of California, Berkeley, CA (United States); Aguirre, James E.; Moore, David F. [Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA (United States); Carilli, Christopher L. [National Radio Astronomy Observatory, Socorro, NM (United States); Jacobs, Daniel C. [School of Earth and Space Exploration, Arizona State University, Tucson, AZ (United States)

2012-09-10T23:59:59.000Z

145

Analysis and Effects of Cytosolic Free Calcium Increases in Response to Elicitors in Nicotiana plumbaginifolia Cells  

Science Journals Connector (OSTI)

...to trigger calcium influx in tobacco (Price et al., 1994 Takahashi et al., 1998...Blein, J.P. (1991). Capsidiol and ethylene production by tobacco cells in response...interactions. Plant J. 5, 507-521. Price, A.H., Taylor, A., Ripley, S...

David Lecourieux; Christian Mazars; Nicolas Pauly; Raoul Ranjeva; Alain Pugin

2002-09-16T23:59:59.000Z

146

Responsiveness summary for the engineering evaluation/cost analysis for decontamination at the St. Louis Downtown Site, St. Louis, Missouri  

SciTech Connect (OSTI)

The US Department of Energy (DOE) is responsible for conducting remedial actions at the Mallinckrodt Chemical Plant, also referred to as the St. Louis Downtown Site (SLDS), located in the city of St. Louis, Missouri. Remedial activities at the SLDS are being carried out under DOE's Formerly Utilized Sites Remedial Action Program (FUSRAP) as part of the overall cleanup planned for three noncontiguous areas in St. Louis, which are collectively referred to as the St. Louis Site. Potential response action alternatives for managing the contaminated material generated at the SLDS have been evaluated in accordance with US Environmental Protection Agency (EPA) guidance for conducting interim actions under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), as amended. An engineering evaluation/cost analysis (EE/CA) report was prepared to document this process. On the basis of the analysis presented in the EE/CA, the preferred alternative for the management of contaminated wastes generated by DOE-supported plant activities is the provision of temporary storage capacity, which can be made available by modifying an existing building (i.e., Building 116) at SLDS. This alternative would enable DOE and Mallinckrodt to coordinate efforts to prevent the uncontrolled relocation of contamination and ensure that ultimate site cleanup objectives are not complicated by plant activities implemented by Mallinckrodt. The EE/CA, dated May 1991, was issued to the general public on June 7, 1991, and a public comment period was held from June 7 through July 10, 1991, in accordance with the public participation process identified in CERCLA. Comments on the proposed action were received in writing from the Missouri Department of Health, private citizen Kay Drey, and the EPA Region 7. This responsiveness summary has been prepared to respond to issues identified in these comment letters on the proposed action.

Picel, M.H.; Peterson, J.M. (Argonne National Lab., IL (United States)); Williams, M.J. (Bechtel National, Inc., Oak Ridge, TN (United States))

1991-12-01T23:59:59.000Z

147

Responsiveness summary for the engineering evaluation/cost analysis for decontamination at the St. Louis Downtown Site, St. Louis, Missouri  

SciTech Connect (OSTI)

The US Department of Energy (DOE) is responsible for conducting remedial actions at the Mallinckrodt Chemical Plant, also referred to as the St. Louis Downtown Site (SLDS), located in the city of St. Louis, Missouri. Remedial activities at the SLDS are being carried out under DOE`s Formerly Utilized Sites Remedial Action Program (FUSRAP) as part of the overall cleanup planned for three noncontiguous areas in St. Louis, which are collectively referred to as the St. Louis Site. Potential response action alternatives for managing the contaminated material generated at the SLDS have been evaluated in accordance with US Environmental Protection Agency (EPA) guidance for conducting interim actions under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), as amended. An engineering evaluation/cost analysis (EE/CA) report was prepared to document this process. On the basis of the analysis presented in the EE/CA, the preferred alternative for the management of contaminated wastes generated by DOE-supported plant activities is the provision of temporary storage capacity, which can be made available by modifying an existing building (i.e., Building 116) at SLDS. This alternative would enable DOE and Mallinckrodt to coordinate efforts to prevent the uncontrolled relocation of contamination and ensure that ultimate site cleanup objectives are not complicated by plant activities implemented by Mallinckrodt. The EE/CA, dated May 1991, was issued to the general public on June 7, 1991, and a public comment period was held from June 7 through July 10, 1991, in accordance with the public participation process identified in CERCLA. Comments on the proposed action were received in writing from the Missouri Department of Health, private citizen Kay Drey, and the EPA Region 7. This responsiveness summary has been prepared to respond to issues identified in these comment letters on the proposed action.

Picel, M.H.; Peterson, J.M. [Argonne National Lab., IL (United States); Williams, M.J. [Bechtel National, Inc., Oak Ridge, TN (United States)

1991-12-01T23:59:59.000Z

148

NREL: Innovation Spectrum - NREL Spectrum of Innovation Video...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

are many...and the challenges are daunting. How will we get there? The National Renewable Energy Laboratory integrates the entire spectrum of innovation, including Fundamental...

149

Consumer response to uncertain promotions: An empirical analysis of conditional rebates  

Science Journals Connector (OSTI)

Abstract We formulate, estimate, and analyze a model of consumer response to promotions where consumers' receipt of the promotional reward is uncertain. The model incorporates consumers' risk aversion and their subjective assessment of the probability that they will get the reward. It is used to assess the effectiveness of a “conditional rebate”, where the uncertainty arises because the reward is contingent on an external event, versus a traditional rebate, which is similar in all respects except that it is certain. We estimate the model using a conjoint choice experiment. Response to conditional rebates is highly segmented and related to perceived thinking costs and savings and entertainment benefits of conditional rebates as well as to event involvement and gambling proneness. In our application, conditional rebates are more cost effective than certain rebates, mostly because consumers' subjective probability of the event occurring is higher than what market wisdom suggests.

Kusum L. Ailawadi; Karen Gedenk; Tobias Langer; Yu Ma; Scott A. Neslin

2014-01-01T23:59:59.000Z

150

Numerical implementation of shape memory alloy (SMA) constitutive response and structural analysis of active composites  

E-Print Network [OSTI]

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . B. 3. Stresses B. 4. Incremental Constitutive Relationship . B. 5. Principle of Virtual Work B. 6. Finite Element Formulation of Equilibrium Equations . . . . B. 7. Final Equations . 116 116 117 117 118 120 122 VITA 126 LIST OF TABLES... of Active Composites. (December 1995) Muhammad Abu Bakar Siddiq Qidwai, B. S. , Middle East Technical University Chair of Advisory Committee: Dr. Dimittis C. Lagoudas Numerical implementation of the thermomechanical constitutive response of shape memory...

Qidwai, Muhammad Abu Bakar Siddiq

2012-06-07T23:59:59.000Z

151

An analysis of factors association with responsibility attribution in incidents of medical malpractice  

E-Print Network [OSTI]

, and relationships. It is a projection of meaning on to this social web. Accepting responsibility for a choice extends well beyond mere selection. It establishes a relationship between an agent and an act. Conte and Paolucci (2004) have described... the levels of coercion and the level of resulting harm. Specifically, Joseph and Tedeschi (1983) isolated three issues. First, coercion is not an acceptable justification when non-harmful alternatives were available to the actor. This acknowledges...

O'Toole, Thomas M.

2007-12-11T23:59:59.000Z

152

Development of flight instrumentation and analysis of an aircraft's lateral response to a discrete two-dimensional vertical gust  

E-Print Network [OSTI]

of the requirement for the degree of MASTER OF SCI~?E May 1973 Major Subject, : Aerospace Engineering D~PK~3lT OF FLIGHT INSTRUMENTATION AND ANALYSIS OF AN AIRCRAFT~S LAIL RESPONSE TO A DISCR TE TN'OWINENSIONAL V&TICAL GUST A Thesis RUSSsLL LANE MASK... DeHavilland DHC 2 'Beaver' STOL aircraft. This is a single engined, high-wing aircraft of all metal construction, Fig. 1. Table 1 pro- vides some quantitative data relating to this aircraft. With the emphasis of this paper directed to the aircraft...

Mask, Russell Lane

1973-01-01T23:59:59.000Z

153

Analysis of Open Automated Demand Response Deployments in California and Guidelines to Transition to Industry Standards  

SciTech Connect (OSTI)

This report reviews the Open Automated Demand Response (OpenADR) deployments within the territories serviced by California?s investor-owned utilities (IOUs) and the transition from the OpenADR 1.0 specification to the formal standard?OpenADR 2.0. As demand response service providers and customers start adopting OpenADR 2.0, it is necessary to ensure that the existing Automated Demand Response (AutoDR) infrastructure investment continues to be useful and takes advantage of the formal standard and its many benefits. This study focused on OpenADR deployments and systems used by the California IOUs and included a summary of the OpenADR deployment from the U.S. Department of Energy-funded demonstration conducted by the Sacramento Municipal Utility District (SMUD). Lawrence Berkeley National Laboratory collected and analyzed data about OpenADR 1.0 deployments, categorized architectures, developed a data model mapping to understand the technical compatibility of each version, and compared the capabilities and features of the two specifications. The findings, for the first time, provided evidence of the total enabled load shed and average first cost for system enablement in the IOU and SMUD service territories. The OpenADR 2.0a profile specification semantically supports AutoDR system architectures and data propagation with a testing and certification program that promotes interoperability, scaled deployments by multiple vendors, and provides additional features that support future services.

Ghatikar, Girish; Riess, David; Piette, Mary Ann

2014-01-02T23:59:59.000Z

154

Federal Spectrum Management at the National Telecommunications...  

Broader source: Energy.gov (indexed) [DOE]

Federal Spectrum Management at the National Telecommunications and Information Administration Federal Spectrum Management at the National Telecommunications and Information...

155

Spectrum Sensing and Reconstruction for Cognitive Radio  

E-Print Network [OSTI]

Spectrum Sensing and Reconstruction for Cognitive Radio Amanpreet S Saini, Zhen Hu, Robert Qiu with spectrum sensing and spectrum reconstruction under the umbrella of cognitive radio which is the smart radio to explore and exploit the free spectrum. Spectrum analyzer is used to emulate cognitive radio to do spectrum

Qiu, Robert Caiming

156

Objective and subjective analysis of acoustical response in newly renovated Palais Moncalm, Quebec City, Canada  

Science Journals Connector (OSTI)

To celebrate the 75th anniversary of Palais Montcalm the building has been almost entirely rebuilt to convert it into the House of Music. The main room named Salle Raoul?Jobin has been designed specifically for the resident chamber orchestra:Les Violons du Roy. Collaboration between acoustical consultant Larry S. King and architect Jacques Plante of MUSE consortium results in a 979 seats concert hall with variable acoustic to accommodate different kinds of musical events. Since reopening in March 2007 the general acoustic has been enthusiastically acclaimed by professionals by world known musicians and by the public. The principal objective of this study is to characterize acoustical response of the room with various adjustments of wall curtains and motorized canopy. This important reflective area is software?controlled in a range of 3 meters depending on musical needs. Acoustical objective parameters such as reverberation time early decay time impulse response or C80 factor will be analyzed and compared to musical subjective perception of a few instruments played at multiple positions on stage and for different listening locations.

Jean?Philippe Migneron; Jean?Gabriel Migneron; Jean?François Hardy

2008-01-01T23:59:59.000Z

157

Studies on dual fuel engine performance and exhaust emission analysis by response surface methodology  

Science Journals Connector (OSTI)

In this present study a five factor three level Box-Behnken response surface design was used to study the effect of five independent variables such as diesel (40%–100%) ethanol (0%-30%) pongamia oil methyl ester (POME) (0%–30%) compressed natural gas (CNG) (0%–20%) and load of the engine (0%–100%) on the performance (brake thermal efficiency brake specific fuel consumption and exhaust gas temperature) and emission characteristics (carbon mono-oxide (CO) carbon dioxides (CO2) unburnt hydrocarbon oxides of nitrogen (NOX) and smoke) of a single cylinder four stroke water cooled diesel engine converted to dual fuel system. It was operated with either diesel fuel or blend with CNG using an electronically controlled solenoid actuated valve mechanism. The experimental results showed that all the process variables have significant effect on the engine performance. The emission characteristics (CO CO2 NOX and Smoke) were significantly lower than the diesel fuel emissions. From the experimental results second order polynomial models were developed to predict the response variables. The optimal conditions were determined and it was found to be: Diesel 70% Ethanol 15% POME 15% CNG 10% and load 50% respectively with a desirability value of 0.894.

R. Senthilraja; V. Sivakumar; J. Prakash Maran

2014-01-01T23:59:59.000Z

158

Energy Market Analysis | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Energy Market Analysis Energy Market Analysis Energy Market Analysis synthesizes all analysis efforts in the analysis spectrum. Scenario analyses, in the context of market...

159

Reservoir characterization based on tracer response and rank analysis of production and injection rates  

SciTech Connect (OSTI)

Quantification of the spatial distribution of properties is important for many reservoir-engineering applications. But, before applying any reservoir-characterization technique, the type of problem to be tackled and the information available should be analyzed. This is important because difficulties arise in reservoirs where production records are the only information for analysis. This paper presents the results of a practical technique to determine preferential flow trends in a reservoir. The technique is a combination of reservoir geology, tracer data, and Spearman rank correlation coefficient analysis. The Spearman analysis, in particular, will prove to be important because it appears to be insightful and uses injection/production data that are prevalent in circumstances where other data are nonexistent. The technique is applied to the North Buck Draw field, Campbell County, Wyoming. This work provides guidelines to assess information about reservoir continuity in interwell regions from widely available measurements of production and injection rates at existing wells. The information gained from the application of this technique can contribute to both the daily reservoir management and the future design, control, and interpretation of subsequent projects in the reservoir, without the need for additional data.

Refunjol, B.T. [Lagoven, S.A., Pdvsa (Venezuela); Lake, L.W. [Univ. of Texas, Austin, TX (United States)

1997-08-01T23:59:59.000Z

160

PAT-1 safety analysis report addendum author responses to request for additional information.  

SciTech Connect (OSTI)

The Plutonium Air Transportable Package, Model PAT-1, is certified under Title 10, Code of Federal Regulations Part 71 by the U.S. Nuclear Regulatory Commission (NRC) per Certificate of Compliance (CoC) USA/0361B(U)F-96 (currently Revision 9). The National Nuclear Security Administration (NNSA) submitted SAND Report SAND2009-5822 to NRC that documented the incorporation of plutonium (Pu) metal as a new payload for the PAT-1 package. NRC responded with a Request for Additional Information (RAI), identifying information needed in connection with its review of the application. The purpose of this SAND report is to provide the authors responses to each RAI. SAND Report SAND2010-6106 containing the proposed changes to the Addendum is provided separately.

Weiner, Ruth F.; Schmale, David T.; Kalan, Robert J.; Akin, Lili A.; Miller, David Russell; Knorovsky, Gerald Albert; Yoshimura, Richard Hiroyuki; Lopez, Carlos; Harding, David Cameron; Jones, Perry L.; Morrow, Charles W.

2010-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "response spectrum 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

NREL: Innovation Spectrum Home Page  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Innovation Spectrum Innovation Spectrum Te xt version The scope of NREL's capabilities emulates the nature of the innovation process itself. Moving new technologies from initial concept to commercial application requires a breadth of expertise across the innovation spectrum, encompassing: Fundamental science Market-relevant research Systems integration Testing and validation Commercialization Deployment The NREL innovation spectrum is highly interactive within the laboratory and across other research institutions and private industry. NREL provides the scientific and analytical leadership to guide the innovation process, contributing knowledge and expertise at each stage. Innovation Success Stories Learn more about the spectrum of clean energy innovation and how NREL is creating a future of sustainable energy systems based on clean,

162

Disruption Analysis and Response Implicattions of Passive Plates for the NSTX Upgrade  

SciTech Connect (OSTI)

The NSTX upgrade project requires analysis qualifications of existing vacuum vessel and passive stabilizing plates for increased plasma performance. Vertical stability is critically dependent on the passive conducting structure that surrounds the plasma. In this paper, the passive conducting structure is analyzed for the upgrade condition during plasma disruption to ensure the level of stress in the stabilizing plates and the fastener is within its design limits. The counter-bore of the passive plates for bolting is evaluated in details and counter-bore bushing is redesigned to prevent shear failure during disruptions as a result of high pulling and pushing forces, particularly for support at the corner bolts

Yuhu Zhai, Peter Titus, Art Brooks, and Ron Hatcher

2012-08-27T23:59:59.000Z

163

Multichannel response analysis on 2D projection views for detection of clustered microcalcifications in digital breast tomosynthesis  

SciTech Connect (OSTI)

Purpose: To investigate the feasibility of a new two-dimensional (2D) multichannel response (MCR) analysis approach for the detection of clustered microcalcifications (MCs) in digital breast tomosynthesis (DBT). Methods: With IRB approval and informed consent, a data set of two-view DBTs from 42 breasts containing biopsy-proven MC clusters was collected in this study. The authors developed a 2D approach for MC detection using projection view (PV) images rather than the reconstructed three-dimensional (3D) DBT volume. Signal-to-noise ratio (SNR) enhancement processing was first applied to each PV to enhance the potential MCs. The locations of MC candidates were then identified with iterative thresholding. The individual MCs were decomposed with Hermite–Gaussian (HG) and Laguerre–Gaussian (LG) basis functions and the channelized Hotelling model was trained to produce the MCRs for each MC on the 2D images. The MCRs from the PVs were fused in 3D by a coincidence counting method that backprojects the MC candidates on the PVs and traces the coincidence of their ray paths in 3D. The 3D MCR was used to differentiate the true MCs from false positives (FPs). Finally a dynamic clustering method was used to identify the potential MC clusters in the DBT volume based on the fact that true MCs of clinical significance appear in clusters. Using two-fold cross validation, the performance of the 3D MCR for classification of true and false MCs was estimated by the area under the receiver operating characteristic (ROC) curve and the overall performance of the MCR approach for detection of clustered MCs was assessed by free response receiver operating characteristic (FROC) analysis. Results: When the HG basis function was used for MCR analysis, the detection of MC cluster achieved case-based test sensitivities of 80% and 90% at the average FP rates of 0.65 and 1.55 FPs per DBT volume, respectively. With LG basis function, the average FP rates were 0.62 and 1.57 per DBT volume at the same sensitivity levels. The difference in the two sets of basis functions for detection of MCs did not show statistical significance. Conclusions: The authors' experimental results indicate that the MCR approach is promising for the detection of MCs on PV images. The HG or LG basis functions are both effective in characterizing the signal response of MCs using the channelized Hotelling model. The coincidence counting method for fusion of the 2D MCR in 3D is an important step for FP reduction. Further study is underway to improve the MCR approach for microcalcification detection in DBT.

Wei, Jun, E-mail: jvwei@umich.edu; Chan, Heang-Ping; Hadjiiski, Lubomir M.; Helvie, Mark A.; Lu, Yao; Zhou, Chuan; Samala, Ravi [Department of Radiology, University of Michigan, Ann Arbor, Michigan 48109-5842 (United States)] [Department of Radiology, University of Michigan, Ann Arbor, Michigan 48109-5842 (United States)

2014-04-15T23:59:59.000Z

164

Analysis of thermal response of a food self-heating system  

Science Journals Connector (OSTI)

This paper presents a distributed model of heat transfer in a self-heating unit for group meals and its numerical simulation. A magnesium alloy and water exothermic reaction provides the necessary energy. The resulting governing equations of chemical reaction and heat conduction that depicts the heater performance were solved to develop an approximate analytical solution, to which experimental data found from literature were compared and curve fitted. Then, a model of a complete food-heating unit for group meals, which include a stack of four sets of food tray, heating tray, and heater sandwiched between them, as well as the cardboard container, was developed. The governing equations for heat conduction in the complete model were solved. The response in thermal performance of the heating system to the parameters that influence heating profiles of the heater such as decay constant and heat generation capacity were studied. The results show that the system thermal performance is most significantly affected by heat generation and a proper combination of heaters with different heat generation capacity can improve temperature uniformity between food trays. The results are useful for designing and optimizing self-heating multi-food tray units.

Son H. Ho; Muhammad M. Rahman; Aydin K. Sunol

2010-01-01T23:59:59.000Z

165

Response Surface Analysis of Elemental Composition and Energy Properties of Corn Stover During Torrefaction  

SciTech Connect (OSTI)

This research studied the effects of torrefaction temperature (250-250 C) and time (30-120 minutes) on elemental composition and energy properties changes in corn stover. Torrefied material was analyzed for moisture content, moisture-free carbon (%), hydrogen (%), nitrogen (%), sulfur (%), and higher heating value (MJ/kg). Results at 350 C and 120 minutes indicated a steep decrease in moisture content to a final value of about 1.48% - a reduction of about 69%. With respect to carbon content, the increase was about 23%, while hydrogen and sulfur content decreased by about 46.82% and 66.6%, respectively. The hydrogen-to-carbon ratio decreased as torrefaction temperature and time increased, with the lowest value of 0.6 observed at 350 C and 120 minutes. Higher heating value measured at 350 C and 60 minutes increased by about 22% and the maximum degree of carbonization observed was about 1.21. Further, the regression models developed for chemical composition in terms of torrefaction temperature and time adequately described the process with coefficient of determination values (R2) in the range of 0.92-0.99 for the elemental composition and energy properties studied. Response surface plots indicated that increasing both torrefaction temperature and time resulted in decreased moisture content, hydrogen content, and the hydrogen to-carbon ratio, and increased carbon content and higher heating value. This effect was more significant at torrefaction temperatures and times >280 C and >30 minutes.

Jaya Shankar Tumuluru; Richard D. Boardman; Christopher T. Wright

2012-02-01T23:59:59.000Z

166

Reconnection of vortex filaments and Kolmogorov spectrum  

E-Print Network [OSTI]

The energy spectrum of the 3D velocity field, induced by collapsing vortex filaments is studied. One of the aims of this work is to clarify the appearance of the Kolmogorov type energy spectrum $E(k)\\varpropto k^{-5/3}$, observed in many numerical works on discrete vortex tubes (quantized vortex filaments in quantum fluids). Usually, explaining classical turbulent properties of quantum turbulence, the model of vortex bundles, is used. This model is necessary to mimic the vortex stretching, which is responsible for the energy transfer in classical turbulence. In our consideration we do not appeal to the possible "bundle arrangement" but explore alternative idea that the turbulent spectra appear from singular solution, which describe the collapsing line at moments of reconnection. One more aim is related to an important and intensively discussed topic - a role of hydrodynamic collapse in the formation of turbulent spectra. We demonstrated that the specific vortex filament configuration generated the spectrum $E(k)$ close to the Kolmogorov dependence and discussed the reason for this as well as the reason for deviation. We also discuss the obtained results from point of view of the both classical and quantum turbulence.

Sergey K. Nemirovskii

2014-04-19T23:59:59.000Z

167

PROSPECT - A precision oscillation and spectrum experiment  

E-Print Network [OSTI]

Segmented antineutrino detectors placed near a compact research reactor provide an excellent opportunity to probe short-baseline neutrino oscillations and precisely measure the reactor antineutrino spectrum. Close proximity to a reactor combined with minimal overburden yield a high background environment that must be managed through shielding and detector technology. PROSPECT is a new experimental effort to detect reactor antineutrinos from the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory, managed by UT Battelle for the U.S. Department of Energy. The detector will use novel lithium-loaded liquid scintillator capable of neutron/gamma pulse shape discrimination and neutron capture tagging. These enhancements improve the ability to identify neutrino inverse-beta decays and reject background events in analysis. Results from these efforts will be covered along with their implications for an oscillation search and a precision spectrum measurement.

T. J. Langford

2014-12-22T23:59:59.000Z

168

PROSPECT - A precision oscillation and spectrum experiment  

E-Print Network [OSTI]

Segmented antineutrino detectors placed near a compact research reactor provide an excellent opportunity to probe short-baseline neutrino oscillations and precisely measure the reactor antineutrino spectrum. Close proximity to a reactor combined with minimal overburden yield a high background environment that must be managed through shielding and detector technology. PROSPECT is a new experimental effort to detect reactor antineutrinos from the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory, managed by UT Battelle for the U.S. Department of Energy. The detector will use novel lithium-loaded liquid scintillator capable of neutron/gamma pulse shape discrimination and neutron capture tagging. These enhancements improve the ability to identify neutrino inverse-beta decays and reject background events in analysis. Results from these efforts will be covered along with their implications for an oscillation search and a precision spectrum measurement.

,

2015-01-01T23:59:59.000Z

169

NREL: Innovation Spectrum - NREL Spectrum of Innovation Video (Text  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Spectrum of Innovation Video (Text Version) Spectrum of Innovation Video (Text Version) Below is the text version of the NREL Spectrum of Innovation video. "...renewable energy is a national imperative..." "...This breakthrough technology will..." "...we are still looking for an innovative material that will..." "...we need a study to determine..." "...the right people need to work together..." "...competing priorities mean we cannot..." There are many voices calling for a future of abundant, clean energy. The choices are many...and the challenges are daunting. How will we get there? The National Renewable Energy Laboratory integrates the entire spectrum of innovation, including Fundamental Science, Market-Relevant Research, Systems Integration, Testing and Validation, Commercialization, and

170

Parallel Radioisotope Collection and Analysis in Response to the Fukushima Release  

SciTech Connect (OSTI)

Two independent air samplers were operated at Pacific Northwest National Laboratory in parallel during the collection of samples from the Fukushima reactor releases. One system is an automated aerosol collection and analysis unit, while the other was a manual sampler of higher daily air volume. The samples collected each day showed excellent correlation in radionuclide activity, although some variations were seen. These variations illustrate the reproducibility of the air sample radionuclide measurements made by the Comprehensive Nuclear-Test-Ban Treaty International Monitoring System (IMS) and show a simple way to acquire useful parallel samples for scientific purposes. In particular, a party wishing to have a “copy” of a sample acquired by the verification regime of the treaty could employ this method and have results similar to the IMS station at low cost and even higher sensitivity.

Woods, Vincent T.; Bowyer, Ted W.; Biegalski, S.; Greenwood, Lawrence R.; Haas, Derek A.; Hayes, James C.; Lepel, Elwood A.; Miley, Harry S.; Morris, Scott J.

2013-05-01T23:59:59.000Z

171

Estimation of some characteristics of driver responses at freeway entrance ramps by probit analysis  

E-Print Network [OSTI]

driver's will- ingness to merge. A probit analysis for each ramp is pre- sented in which a linear combination xo+ qV , where q r' is unknown, is co=sidered the stimulus and r the re- sponse. The assumption here is that. each driver has a tolerance... T for the stimulus t = xO+ qV . If t & T, r' the driver merges; if t + T, he waits. It is assumed that the distribution. of all such T 's is normal with 18 and 1 s = ?. Then 1 (35) Y = a & pit = a + pl(xO&qV ) = n + l31xO& 82V where now P2 = qPI. In each...

LaMotte, Lynn Roy

2012-06-07T23:59:59.000Z

172

Supplement analysis for continued operation of Lawrence Livermore National Laboratory and Sandia National Laboratories, Livermore. Volume 2: Comment response document  

SciTech Connect (OSTI)

The US Department of Energy (DOE), prepared a draft Supplement Analysis (SA) for Continued Operation of Lawrence Livermore National Laboratory (LLNL) and Sandia National Laboratories, Livermore (SNL-L), in accordance with DOE`s requirements for implementation of the National Environmental Policy Act of 1969 (NEPA) (10 Code of Federal Regulations [CFR] Part 1021.314). It considers whether the Final Environmental Impact Statement and Environmental Impact Report for Continued Operation of Lawrence Livermore National Laboratory and Sandia National Laboratories, Livermore (1992 EIS/EIR) should be supplement3ed, whether a new environmental impact statement (EIS) should be prepared, or no further NEPA documentation is required. The SA examines the current project and program plans and proposals for LLNL and SNL-L, operations to identify new or modified projects or operations or new information for the period from 1998 to 2002 that was not considered in the 1992 EIS/EIR. When such changes, modifications, and information are identified, they are examined to determine whether they could be considered substantial or significant in reference to the 1992 proposed action and the 1993 Record of Decision (ROD). DOE released the draft SA to the public to obtain stakeholder comments and to consider those comments in the preparation of the final SA. DOE distributed copies of the draft SA to those who were known to have an interest in LLNL or SNL-L activities in addition to those who requested a copy. In response to comments received, DOE prepared this Comment Response Document.

NONE

1999-03-01T23:59:59.000Z

173

Behavioral Response to Hydrogen Fuel Cell Vehicles and Refueling: A Comparative Analysis of Short- and Long-Term Exposure  

E-Print Network [OSTI]

on the attitude towards hydrogen fuel cell buses in the CUTEBEHAVIORAL RESPONSE TO HYDROGEN FUEL CELL VEHICLES ANDBEHAVIORAL RESPONSE TO HYDROGEN FUEL CELL VEHICLES AND

Martin, Elliot; Shaheen, Susan; Lipman, Timothy; Lidicker, Jeffery

2008-01-01T23:59:59.000Z

174

Raman Spectrum of Heavy Water  

Science Journals Connector (OSTI)

... . of 99.2 gm./lOO gm. D2O ( 1.1049) supplied by the Norsk Hydro-Elektrisk Kvaelstofaktieselskab. The Raman spectrum of the substance was photographed with a Hilger ...

R. ANANTHAKRISHNAN

1935-10-05T23:59:59.000Z

175

Spectrum of C_heart  

E-Print Network [OSTI]

Spectrum of C_heart where 1 + z + 2\\sqrt{1 - z^2} heart(z)= ------------------------- 3 - z + 2\\sqrt{1 - z^2}. Figure 7.1, page 303, of "Composition Operators on Spaces ...

176

What should we say to extraterrestrial intelligence?: An analysis of responses to “Earth Speaks”  

Science Journals Connector (OSTI)

If scientists engaged in the Search for Extraterrestrial Intelligence (SETI) detect a signal from an extraterrestrial civilization, one of the most pressing issues facing humankind will be “Should we reply, and if so, what should we say?” Building on an infrastructure that the SETI Institute used to gather over 50,000 messages from around the world to send onboard the Kepler mission, Earth Speaks invites people to submit online their text messages, pictures, and sounds, as they ponder what they would want to say to an extraterrestrial civilization. Participants for the study have been recruited from 68 nations, from all walks of life. By tracking demographic variables for each person submitting a message, we have identified commonalities and differences in message content that are related to such factors as age and gender. Similarly, by tracking the date on which messages were submitted and the location from which the message was sent, we have also identified the way in which message content is related to time and geographic location. Furthermore, when we compare previous themes derived from textual messages to our current categorical analysis of submitted images, we find our textual themes to be concurrently validated. In doing so, we find the Earth Speaks Website not only allows for the construction of interstellar messages, but also functions as a projective psychological assessment of species-level human identity. We next proceed to demonstrate the generative power of our method by showing how we can synthesize artificial messages from the Earth Speaks messages. We then discuss how these artificially generated messages can be tailored to represent both commonality and diversity in human thought as it is revealed through our data. We end by discussing our method's utility for cross-disciplinary research in the social sciences and humanities.

Douglas A. Vakoch; Timothy A. Lower; Britton A. Niles; Katrina A. Rast; Christopher DeCou

2013-01-01T23:59:59.000Z

177

Spectrum Clouds: A Session Based Spectrum Trading System for Multi-hop Cognitive Radio Networks  

E-Print Network [OSTI]

of opportunistic using licensed spectrum bands has initiated the spectrum trading in multi-hop cognitive radioSpectrum Clouds: A Session Based Spectrum Trading System for Multi-hop Cognitive Radio Networks in the demand for radio spectrum. In parallel with that, current static spectrum allocation policy of Federal

Latchman, Haniph A.

178

Spectrum Technology Workshop | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Technology Workshop Spectrum Technology Workshop Agenda.pdf More Documents & Publications Radio and Spectrum Management Transuranic Waste Transportation Working Group Agenda...

179

Spectrum sensing through implementation of USRP2.  

E-Print Network [OSTI]

??Scarcity of the wireless spectrum has led to the development of new techniques for better utilization of the wireless spectrum. Demand for high data rates… (more)

Aftab, Adnan

2011-01-01T23:59:59.000Z

180

Compressive Spectrum Sensing for Cognitive Radio Networks.  

E-Print Network [OSTI]

??Spectrum sensing is the most important part in cognitive radios. Wideband spectrum sensing requires high speed and large data samples. It makes sampling process challenging… (more)

Nakarmi, Ukash

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "response spectrum 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

WTB & Spectrum Access Overview | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

WTB & Spectrum Access Overview More Documents & Publications An Introduction to Spectrum Engineering NBP RFI: Communications Requirements Reply Comments of Southern Company...

182

Electromagnetic Spectrum of Radium D  

Science Journals Connector (OSTI)

The electromagnetic spectrum of RaD has been studied by the proportional counter spectrometry technique. The work of the Curie Laboratory on the gamma-ray spectrum has been generally confirmed. However, the presumed K x-ray lines are of much lower intensity and occur at a lower energy than previously reported. The L x-ray intensity is 22 per hundred disintegrations, indicating 0.63 conversion per disintegration and a conversion coefficient of 18.3 for the principal gamma-ray.

P. E. Damon and R. R. Edwards

1953-04-15T23:59:59.000Z

183

Junior QA Engineer Intern -14895BR -EH QA Engineers are responsible for facilitating the analysis, evaluation, and testing of firmware across multiple platforms.  

E-Print Network [OSTI]

Junior QA Engineer Intern - 14895BR - EH QA Engineers are responsible for facilitating the analysis, evaluation, and testing of firmware across multiple platforms. · Develop, implement, review ­ C, Java, or other object-oriented programming language acceptable. · Networking experience (L2/L3

Ravikumar, B.

184

Response to Comment on “Solid Recovered Fuel: Materials Flow Analysis and Fuel Property Development during the Mechanical Processing of Biodried Waste”  

Science Journals Connector (OSTI)

Response to Comment on “Solid Recovered Fuel: Materials Flow Analysis and Fuel Property Development during the Mechanical Processing of Biodried Waste” ... treatment-derived SRF quality, informing the development of realistic SRF quality specifications, through modeling exercises, needed for effective thermal recovery. ... Velis, C. A.; Cooper, J.Are solid recovered fuels resource-efficient? ...

Costas A. Velis; Stuart Wagland; Phil Longhurst; Bryce Robson; Keith Sinfield; Stephen Wise; Simon Pollard

2013-12-05T23:59:59.000Z

185

Two-dimensional analysis of the effect of subsurface anomalies on the free surface response to incident SH-waves  

Science Journals Connector (OSTI)

......the ground surface response. This earlier study...ships between the response and the structure...than the time for energy to propagate across...computer time and storage, one major advantage...the power spectral response when an anomaly...is dimensionless frequency: (depth of anomaly......

Joel M. Crichlow; David Beckles; William P. Aspinall

1984-11-01T23:59:59.000Z

186

Spectrum Sensing Techniques in Cognitive Radio Communications  

E-Print Network [OSTI]

1 Spectrum Sensing Techniques in Cognitive Radio Communications Mario Bkassiny*, Yang Li, Georges for CR's. Index Terms-- Cognitive radio, cooperative spectrum sensing, dynamic spectrum access, energy, jayaweera, christos}@ece.unm.edu Abstract-- In this paper, we review some of the recent patents on spectrum

Jayaweera, Sudharman K.

187

Coalition Formation Games for Collaborative Spectrum Sensing  

E-Print Network [OSTI]

demand on the radio spectrum. However, the spectrum resources are scarce and most of them have been already licensed to existing operators. Various studies have shown that the actual licensed spectrum remains unoccupied for large periods [1]. For efficiently exploiting these spectrum holes, cognitive radio

Paris-Sud XI, Université de

188

Smart Radio Spectrum Management for Cognitive Radio  

E-Print Network [OSTI]

Today's wireless networks are characterized by fixed spectrum assignment policy. The limited available spectrum and the inefficiency in the spectrum usage necessitate a new communication paradigm to exploit the existing wireless spectrum opportunistically. Cognitive radio is a paradigm for wireless communication in which either a network or a wireless node changes its transmission or reception parameters to communicate efficiently avoiding interference with licensed or unlicensed users. In this work, a fuzzy logic based system for spectrum management is proposed where the radio can share unused spectrum depending on some parameters like distance, signal strength, node velocity and availability of unused spectrum. The system is simulated and is found to give satisfactory results.

Bhattacharya, Partha Pratim; Gera, Rishita; Agarwal, Anjali

2011-01-01T23:59:59.000Z

189

Ion beam energy spectrum calculation via dosimetry data deconvolution.  

SciTech Connect (OSTI)

The energy spectrum of a H{sup +} beam generated within the HERMES III accelerator is calculated from dosimetry data to refine future experiments. Multiple layers of radiochromic film are exposed to the beam. A graphic user interface was written in MATLAB to align the film images and calculate the beam's dose depth profile. Singular value regularization is used to stabilize the unfolding and provide the H{sup +} beam's energy spectrum. The beam was found to have major contributions from 1 MeV and 8.5 MeV protons. The HERMES III accelerator is typically used as a pulsed photon source to experimentally obtain photon impulse response of systems due to high energy photons. A series of experiments were performed to explore the use of Hermes III to generate an intense pulsed proton beam. Knowing the beam energy spectrum allows for greater precision in experiment predictions and beam model verification.

Harper-Slaboszewicz, Victor Jozef; Sharp, Andrew Clinton (A& M University, College Station, TX)

2010-10-01T23:59:59.000Z

190

Three-dimensional Numerical Analysis on Blade Response of Vertical Axis Tidal Current Turbine Under Operational Condition  

SciTech Connect (OSTI)

Tidal power as a large-scale renewable source of energy has been receiving significant attention recently because of its advantages over the wind and other renewal energy sources. The technology used to harvest energy from tidal current is called a tidal current turbine. Though some of the principles of wind turbine design are applicable to tidal current turbines, the design of latter ones need additional considerations like cavitation damage, corrosion etc. for the long-term reliability of such turbines. Depending up on the orientation of axis, tidal current turbines can be classified as vertical axis turbines or horizontal axis turbines. Existing studies on the vertical axis tidal current turbine focus more on the hydrodynamic aspects of the turbine rather than the structural aspects. This paper summarizes our recent efforts to study the integrated hydrodynamic and structural aspects of the vertical axis tidal current turbines. After reviewing existing methods in modeling tidal current turbines, we developed a hybrid approach that combines discrete vortex method -finite element method that can simulate the integrated hydrodynamic and structural response of a vertical axis turbine. This hybrid method was initially employed to analyze a typical three-blade vertical axis turbine. The power coefficient was used to evaluate the hydrodynamic performance, and critical deflection was considered to evaluate the structural reliability. A sensitivity analysis was also conducted with various turbine height-to-radius ratios. The results indicate that both the power output and failure probability increase with the turbine height, suggesting a necessity for optimal design. An attempt to optimize a 3-blade vertical axis turbine design with hybrid method yielded a ratio of turbine height to radius (H/R) about 3.0 for reliable maximum power output.

Li, Ye; Karri, Naveen K.; Wang, Qi

2014-04-30T23:59:59.000Z

191

Transcriptome analysis reveals response regulator SO2426-mediated gene expression in Shewanella oneidensis MR-1 under chromate challenge  

SciTech Connect (OSTI)

Shewanella oneidensis MR-1 exhibits diverse metal ion-reducing capabilities and thus is of potential utility as a bioremediation agent. Knowledge of the molecular components and regulatory mechanisms dictating cellular responses to heavy metal stress, however, remains incomplete. In a previous work, the S. oneidensis so2426 gene, annotated as a DNA-binding response regulator, was demonstrated to be specifically responsive at both the transcript and protein levels to acute chromate [Cr(VI)] challenge. To delineate the cellular function of SO2426 and its contribution to metal stress response, we integrated genetic and physiological approaches with a genome-wide screen for target gene candidates comprising the SO2426 regulon.

Chourey, Karuna [ORNL; Wei, Wei [ORNL; Wan, Xiu-Feng [Centers for Disease Control and Prevention; Thompson, Dorothea K. [Purdue University

2008-01-01T23:59:59.000Z

192

Towards Cognitive Radio Networks: Spectrum Utilization Measurements in Suburb Environment  

E-Print Network [OSTI]

Towards Cognitive Radio Networks: Spectrum Utilization Measurements in Suburb Environment Václav in an opportunistic way. Cognitive radio concept for better spectrum utilization is introduced here along -- Cognitive radio, radio spectrum management, spectrum sensing, spectrum utilization. I. INTRODUCTION

Paris-Sud XI, Université de

193

Public safety radios must pool spectrum  

E-Print Network [OSTI]

The dynamic-spectrum-access research and development community is maturing technologies that will enable radios to share RF spectrum much more intensively. The adoption of DSA technologies by the public-safety community ...

Lehr, William Herndon

194

Detectability of Radio Frequency Interference due to Spread Spectrum Communication Signals using the  

E-Print Network [OSTI]

Detectability of Radio Frequency Interference due to Spread Spectrum Communication Signals using-- Analysis of detectability of the kurtosis algorithm for pulsed-sinusoidal Radio Frequency Interference (RFI) has already been performed in detail. The detectability for wide- band spread-spectrum RFI

Ruf, Christopher

195

Spectrum Characterization for Opportunistic Cognitive Radio Systems  

E-Print Network [OSTI]

1 Spectrum Characterization for Opportunistic Cognitive Radio Systems Tevfik Y¨ucek and H challenging problems in cognitive radio systems. The spectrum of interest needs to be characterized and unused initial network entry is also discussed as a case study. Index Terms-- Cognitive radio, spectrum sensing

Arslan, Hüseyin

196

DCE-MRI defined subvolumes of a brain metastatic lesion by principle component analysis and fuzzy-c-means clustering for response assessment of radiation therapy  

SciTech Connect (OSTI)

Purpose: To develop a pharmacokinetic modelfree framework to analyze the dynamic contrast enhanced magnetic resonance imaging (DCE-MRI) data for assessment of response of brain metastases to radiation therapy. Methods: Twenty patients with 45 analyzable brain metastases had MRI scans prior to whole brain radiation therapy (WBRT) and at the end of the 2-week therapy. The volumetric DCE images covering the whole brain were acquired on a 3T scanner with approximately 5 s temporal resolution and a total scan time of about 3 min. DCE curves from all voxels of the 45 brain metastases were normalized and then temporally aligned. A DCE matrix that is constructed from the aligned DCE curves of all voxels of the 45 lesions obtained prior to WBRT is processed by principal component analysis to generate the principal components (PCs). Then, the projection coefficient maps prior to and at the end of WBRT are created for each lesion. Next, a pattern recognition technique, based upon fuzzy-c-means clustering, is used to delineate the tumor subvolumes relating to the value of the significant projection coefficients. The relationship between changes in different tumor subvolumes and treatment response was evaluated to differentiate responsive from stable and progressive tumors. Performance of the PC-defined tumor subvolume was also evaluated by receiver operating characteristic (ROC) analysis in prediction of nonresponsive lesions and compared with physiological-defined tumor subvolumes. Results: The projection coefficient maps of the first three PCs contain almost all response-related information in DCE curves of brain metastases. The first projection coefficient, related to the area under DCE curves, is the major component to determine response while the third one has a complimentary role. In ROC analysis, the area under curve of 0.88 ± 0.05 and 0.86 ± 0.06 were achieved for the PC-defined and physiological-defined tumor subvolume in response assessment. Conclusions: The PC-defined subvolume of a brain metastasis could predict tumor response to therapy similar to the physiological-defined one, while the former is determined more rapidly for clinical decision-making support.

Farjam, Reza; Tsien, Christina I.; Lawrence, Theodore S. [Department of Radiation Oncology, University of Michigan, 1500 East Medical Center Drive, SPC 5010, Ann Arbor, Michigan 48109-5010 (United States)] [Department of Radiation Oncology, University of Michigan, 1500 East Medical Center Drive, SPC 5010, Ann Arbor, Michigan 48109-5010 (United States); Cao, Yue, E-mail: yuecao@umich.edu [Department of Radiation Oncology, University of Michigan, 1500 East Medical Center Drive, SPC 5010, Ann Arbor, Michigan 48109-5010 (United States) [Department of Radiation Oncology, University of Michigan, 1500 East Medical Center Drive, SPC 5010, Ann Arbor, Michigan 48109-5010 (United States); Department of Radiology, University of Michigan, 1500 East Medical Center Drive, Med Inn Building C478, Ann Arbor, Michigan 48109-5842 (United States); Department of Biomedical Engineering, University of Michigan, 2200 Bonisteel Boulevard, Ann Arbor, Michigan 48109-2099 (United States)

2014-01-15T23:59:59.000Z

197

Hybrid spread spectrum radio system  

DOE Patents [OSTI]

Systems and methods are described for hybrid spread spectrum radio systems. A method includes modulating a signal by utilizing a subset of bits from a pseudo-random code generator to control an amplification circuit that provides a gain to the signal. Another method includes: modulating a signal by utilizing a subset of bits from a pseudo-random code generator to control a fast hopping frequency synthesizer; and fast frequency hopping the signal with the fast hopping frequency synthesizer, wherein multiple frequency hops occur within a single data-bit time.

Smith, Stephen F. (London, TN); Dress, William B. (Camas, WA)

2010-02-02T23:59:59.000Z

198

SPARTA: Stable and Efficient Spectrum Access in Next Generation Dynamic Spectrum Networks  

E-Print Network [OSTI]

and development require easy and reliable access to radio spectrum. However, exist- ing regulations allocateSPARTA: Stable and Efficient Spectrum Access in Next Generation Dynamic Spectrum Networks Lili Cao.S.A Abstract--Future wireless infrastructure networks will dynam- ically access spectrum for maximum

Almeroth, Kevin C.

199

Joint Spectrum Allocation and Scheduling for Fair Spectrum Sharing in Cognitive Radio  

E-Print Network [OSTI]

Joint Spectrum Allocation and Scheduling for Fair Spectrum Sharing in Cognitive Radio Wireless University, Tempe, AZ 85287-8809. Email:{misra,xue}@asu.edu Abstract Cognitive radio and Dynamic Spectrum joint spectrum alloca- tion and scheduling problems in cognitive radio wireless networks with the objec

Misra, Satyajayant

200

Determination of a mutational spectrum  

DOE Patents [OSTI]

A method of resolving (physically separating) mutant DNA from nonmutant DNA and a method of defining or establishing a mutational spectrum or profile of alterations present in nucleic acid sequences from a sample to be analyzed, such as a tissue or body fluid. The present method is based on the fact that it is possible, through the use of DGGE, to separate nucleic acid sequences which differ by only a single base change and on the ability to detect the separate mutant molecules. The present invention, in another aspect, relates to a method for determining a mutational spectrum in a DNA sequence of interest present in a population of cells. The method of the present invention is useful as a diagnostic or analytical tool in forensic science in assessing environmental and/or occupational exposures to potentially genetically toxic materials (also referred to as potential mutagens); in biotechnology, particularly in the study of the relationship between the amino acid sequence of enzymes and other biologically-active proteins or protein-containing substances and their respective functions; and in determining the effects of drugs, cosmetics and other chemicals for which toxicity data must be obtained.

Thilly, William G. (Winchester, MA); Keohavong, Phouthone (Cambridge, MA)

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "response spectrum 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

On the Spectrum of Superspheres  

E-Print Network [OSTI]

Sigma models on coset superspaces, such as odd dimensional superspheres, play an important role in physics and in particular the AdS/CFT correspondence. In this work we apply recent general results on the spectrum of coset space models and on supergroup WZNW models to study the conformal sigma model with target space S^{3|2}. We construct its vertex operators and provide explicit formulas for their anomalous dimensions, at least to leading order in the sigma model coupling. The results are used to revisit a non-perturbative duality between the supersphere and the OSP(4|2) Gross-Neveu model that was conjectured by Candu and Saleur. With the help of powerful all-loop results for 1/2 BPS operators in the Gross-Neveu model we are able to recover the entire zero mode spectrum of the sigma model at a certain finite value of the Gross-Neveu coupling. In addition, we argue that the sigma model constraints and equations of motion are implemented correctly in the dual Gross-Neveu description. On the other hand, high(er) gradient operators of the sigma model are not all accounted for. It is possible that this discrepancy is related to an instability from high gradient operators that has previously been observed in the context of Anderson localization.

Alessandra Cagnazzo; Volker Schomerus; Vaclav Tlapak

2014-08-28T23:59:59.000Z

202

On the Spectrum of Superspheres  

E-Print Network [OSTI]

Sigma models on coset superspaces, such as odd dimensional superspheres, play an important role in physics and in particular the AdS/CFT correspondence. In this work we apply recent general results on the spectrum of coset space models and on supergroup WZNW models to study the conformal sigma model with target space S^{3|2}. We construct its vertex operators and provide explicit formulas for their anomalous dimensions, at least to leading order in the sigma model coupling. The results are used to revisit a non-perturbative duality between the supersphere and the OSP(4|2) Gross-Neveu model that was conjectured by Candu and Saleur. With the help of powerful all-loop results for 1/2 BPS operators in the Gross-Neveu model we are able to recover the entire zero mode spectrum of the sigma model at a certain finite value of the Gross-Neveu coupling. In addition, we argue that the sigma model constraints and equations of motion are implemented correctly in the dual Gross-Neveu description. On the other hand, high(er...

Cagnazzo, Alessandra; Tlapak, Vaclav

2014-01-01T23:59:59.000Z

203

Energy spectrum of cosmic ray muons above 10 TeV according to BUST data  

Science Journals Connector (OSTI)

The energy spectrum of cosmic ray muons in the range of several TeV to ... obtained through the analysis of multiple interactions of muons (the pair meter technique) in the ... are compared with prior BUST data o...

A. G. Bogdanov; R. P. Kokoulin…

2011-03-01T23:59:59.000Z

204

The light nuclei energy spectrum of primary cosmic rays using EAS MSU array data  

Science Journals Connector (OSTI)

The change in the energy spectrum index ?? in the knee region was determined by means of analysis of extensive air showers (EAS) spectra using the number of the particles measured by the EAS MSU array. The val...

N. N. Kalmykov; V. N. Kalmykov; G. V. Kulikov…

2008-12-01T23:59:59.000Z

205

Energy Spectrum of the Soft Component near Sea Level  

Science Journals Connector (OSTI)

An analysis of the transition curves of Carmichael and Steljes has been carried out to yield the transition curves in lead of ion-chamber bursts produced by cascades initiated by the electrons and photons of the soft component incident from the atmosphere. From the rates at the maxima of these transition curves, the absolute omnidirectional integral energy spectrum of the electrons and photons of the soft component at sea level, in the energy range from about 100 Mev to 100 Bev, is deduced. Incident electrons and photons associated with extensive air showers, as identified by coincidences with a nearby larger ion chamber, are excluded. An additional single experimental point on the integral spectrum (8.4×10-3 per sphere of unit area per sec) is obtained from the observed rate of electrons of all energies greater than 1 Mev which intersect the unshielded ion chamber. Since a quantitative relation from electromagnetic cascade theory is made use of in the derivation of the energy spectrum, and since this relation is at present uncertain for lead in the energy range involved, the possible error of the flux in the energy spectrum (±100%) is much larger than that of the observed rates of occurrence of bursts (±5%). In this respect the spectrum is preliminary only. In the energy range below 400 Mev the integral spectrum is in agreement with previous absolute measurements; below 2 Bev it is in conformity with a previous relative measurement; from 1.6 Bev to 100 Bev, where there are no previous determinations, it obeys a power law of exponent -2.00 and the rate for 1.6 Bev is 2.4×10-5 per sphere of unit area per sec.

Hugh Carmichael

1957-09-01T23:59:59.000Z

206

Spectrum Auction Framework for Access Allocation in Cognitive Radio Networks  

E-Print Network [OSTI]

1 Spectrum Auction Framework for Access Allocation in Cognitive Radio Networks Gaurav S. Kasbekar does not exist. Index Terms Cognitive Radio Networks, Spectrum Auctions, Algorithms I. INTRODUCTION, Wireless Meteropolitan Area networks etc., demand for radio spectrum is increasing. Currently, spectrum

Sarkar, Saswati

207

Value of Demand Response -Introduction Klaus Skytte  

E-Print Network [OSTI]

Value of Demand Response - Introduction Klaus Skytte Systems Analysis Department February 7, 2006 Energinet.dk, Ballerup #12;What is Demand Response? Demand response (DR) is the short-term response

208

Experiences with aquifer testing and analysis in fractured low-permeability sedimentary rocks exhibiting nonradial pumping response  

SciTech Connect (OSTI)

Multiple-well aquifer pumping tests have been used successfully to measure the bulk hydraulic properties of limestone and shale formations of the Conasauga Group of East Tennessee and to define directional components in transmissivity associated with joints and small-scale folds. This experience demonstrates that multiple-well pumping tests can be used to measure the characteristics of low-permeability fractured rocks, and it illustrates the application of data interpretation techniques that are based on models of nonradial aquifer pumping response. Analytical models that have been used to interpret pumping test data include models for simple anisotropic response and for complex pumping response in an anisotropic aquifer intersected by a single high-conductivity vertical fracture. Comparisons of results obtained using nonradial flow methods with those obtained using traditional (radial flow) analytical methods indicate that the error from radial flow methods is generally less than an order of magnitude, an insignificant error in most low-permeability settings. However, the nonradial flow methods provide much more information on structural controls on groundwater movement. Special challenges encountered in conducting aquifer pumping tests in this hydrogeologic environment include selecting a pumping rate that can be sustained after fracture storage is depleted and laying out a test configuration that is consistent with the test geometry required by the nonradial flow interpretive models. Effective test design and data interpretation thus require extensive insight into site geology.

Smith, E.D.; Vaughan, N.D.

1985-01-01T23:59:59.000Z

209

Closed loop adaptive control of spectrum-producing step using neural networks  

DOE Patents [OSTI]

Characteristics of the plasma in a plasma-based manufacturing process step are monitored directly and in real time by observing the spectrum which it produces. An artificial neural network analyzes the plasma spectrum and generates control signals to control one or more of the process input parameters in response to any deviation of the spectrum beyond a narrow range. In an embodiment, a plasma reaction chamber forms a plasma in response to input parameters such as gas flow, pressure and power. The chamber includes a window through which the electromagnetic spectrum produced by a plasma in the chamber, just above the subject surface, may be viewed. The spectrum is conducted to an optical spectrometer which measures the intensity of the incoming optical spectrum at different wavelengths. The output of optical spectrometer is provided to an analyzer which produces a plurality of error signals, each indicating whether a respective one of the input parameters to the chamber is to be increased or decreased. The microcontroller provides signals to control respective controls, but these lines are intercepted and first added to the error signals, before being provided to the controls for the chamber. The analyzer can include a neural network and an optional spectrum preprocessor to reduce background noise, as well as a comparator which compares the parameter values predicted by the neural network with a set of desired values provided by the microcontroller.

Fu, Chi Yung (San Francisco, CA)

1998-01-01T23:59:59.000Z

210

The radio spectrum of Sgr A*  

E-Print Network [OSTI]

We discuss the radio spectrum of Sgr A* \\index{Sgr A*, radio spectrum} in the frequency range between $\\approx 1\\,{\\rm GHz}$ and $\\approx 1\\,000\\,{\\rm GHz}$, show that it can be explained by optically thin synchrotron radiation \\index{Sgr A*, synchrotron radiation, optically thin} of relativistic electrons, and point toward a possible correlation between the spectrum of Sgr A* and larger-scale ($\\la 50\\,{\\rm pc}$) radio emission from the Galactic Center \\index{Galactic Center} region.

Wolfgang J. Duschl; Harald Lesch

1994-11-03T23:59:59.000Z

211

Entanglement Entropy and Entanglement Spectrum of the Kitaev Model  

Science Journals Connector (OSTI)

In this Letter, we obtain an exact formula for the entanglement entropy of the ground state and all excited states of the Kitaev model. Remarkably, the entanglement entropy can be expressed in a simple separable form S=SG+SF, with SF the entanglement entropy of a free Majorana fermion system and SG that of a Z2 gauge field. The Z2 gauge field part contributes to the universal “topological entanglement entropy” of the ground state while the fermion part is responsible for the nonlocal entanglement carried by the Z2 vortices (visons) in the non-Abelian phase. Our result also enables the calculation of the entire entanglement spectrum and the more general Renyi entropy of the Kitaev model. Based on our results we propose a new quantity to characterize topologically ordered states—the capacity of entanglement, which can distinguish the states with and without topologically protected gapless entanglement spectrum.

Hong Yao and Xiao-Liang Qi

2010-08-16T23:59:59.000Z

212

Cognitive radio networks for dynamic spectrum management.  

E-Print Network [OSTI]

??A fundamental evolution is witnessed in recent research and development of wireless communications: much effort is put on shifting from the current static spectrum management… (more)

Jia, Juncheng

2009-01-01T23:59:59.000Z

213

Proceedings of the IEEE, vol. 97, no. 4, pp. 708-19, April 2009. Sharing Spectrum through Spectrum Policy Reform  

E-Print Network [OSTI]

Spectrum Policy Reform and Cognitive Radio1 Jon M. Peha Carnegie Mellon University Abstract Traditionally inefficient use of spectrum. Cognitive radio along with software radio, spectrum sensors, mesh networks sharing, spectrum policy, cognitive radio, band manager, unlicensed, etiquette, opportunistic access

Peha, Jon M.

214

Investment and Pricing with Spectrum Uncertainty: A Cognitive Operator's Perspective  

E-Print Network [OSTI]

" of licensed bands and dynamically leasing from the spectrum owner. As a result, a C-MVNO can make flexible--Cognitive radio, spectrum trading, spectrum sensing, dynamic spectrum leasing, spectrum pricing, Stackelberg game affecting the normal oper- ation of the spectrum owner who serves the primary (licensed) users. Dynamic

Huang, Jianwei

215

Earthquake Damage Detection in the Imperial County Services Building III: Analysis of Wave Travel Times via Impulse Response Functions  

E-Print Network [OSTI]

, one such method is explored using strong motion data from the 1979 Imperial Valley Earthquake recorded1 Earthquake Damage Detection in the Imperial County Services Building III: Analysis of Wave Travel in the former Imperial County Services (ICS) Building, severely damaged by this earthquake. Shear wave travel

Southern California, University of

216

THE SPECTRUM OF Fe II  

SciTech Connect (OSTI)

The spectrum of singly ionized iron (Fe II) has been recorded using high-resolution Fourier transform (FT) and grating spectroscopy over the wavelength range 900 A to 5.5 {mu}m. The spectra were observed in high-current continuous and pulsed hollow cathode discharges using FT spectrometers at the Kitt Peak National Observatory, Tucson, AZ and Imperial College, London and with the 10.7 m Normal Incidence Spectrograph at the National Institute of Standards and Technology. Roughly 12,900 lines were classified using 1027 energy levels of Fe II that were optimized to measured wavenumbers. The wavenumber uncertainties of lines in the FT spectra range from 10{sup -4} cm{sup -1} for strong lines around 4 {mu}m to 0.05 cm{sup -1} for weaker lines around 1500 A. The wavelength uncertainty of lines in the grating spectra is 0.005 A. The ionization energy of (130,655.4 {+-} 0.4) cm{sup -1} was estimated from the 3d{sup 6}({sup 5}D)5g and 3d{sup 6}({sup 5}D)6h levels.

Nave, Gillian [National Institute of Standards and Technology, Gaithersburg, MD 20899-8422 (United States); Johansson, Sveneric, E-mail: gillian.nave@nist.gov [Lund Observatory, University of Lund, Box 43, SE-22100 Lund (Sweden)

2013-01-15T23:59:59.000Z

217

Mainstream consumers driving plug-in battery-electric and plug-in hybrid electric cars: A qualitative analysis of responses and evaluations  

Science Journals Connector (OSTI)

Plug-in electric vehicles can potentially emit substantially lower CO2 emissions than internal combustion engine vehicles, and so have the potential to reduce transport emissions without curtailing personal car use. Assessing the potential uptake of these new categories of vehicles requires an understanding of likely consumer responses. Previous in-depth explorations of appraisals and evaluations of electric vehicles have tended to focus on ‘early adopters’, who may not represent mainstream consumers. This paper reports a qualitative analysis of responses to electric cars, based on semi-structured interviews conducted with 40 UK non-commercial drivers (20 males, 20 females; age 24–70 years) at the end of a seven-day period of using a battery electric car (20 participants) or a plug-in hybrid car (20 participants). Six core categories of response were identified: (1) cost minimisation; (2) vehicle confidence; (3) vehicle adaptation demands; (4) environmental beliefs; (5) impression management; and, underpinning all other categories, (6) the perception of electric cars generally as ‘work in progress’ products. Results highlight potential barriers to the uptake of current-generation (2010) plug-in electric cars by mainstream consumers. These include the prioritization of personal mobility needs over environmental benefits, concerns over the social desirability of electric vehicle use, and the expectation that rapid technological and infrastructural developments will make current models obsolete. Implications for the potential uptake of future electric vehicles are discussed.

Ella Graham-Rowe; Benjamin Gardner; Charles Abraham; Stephen Skippon; Helga Dittmar; Rebecca Hutchins; Jenny Stannard

2012-01-01T23:59:59.000Z

218

Spectrum Energy Inc SEI | Open Energy Information  

Open Energy Info (EERE)

Energy Inc SEI Energy Inc SEI Jump to: navigation, search Name Spectrum Energy Inc (SEI) Place Elk Grove, California Zip 95758 Sector Efficiency, Services, Solar Product US-based solar and energy services company that installs PV systems on a turnkey-basis; also provides evaluations of energy efficiency. References Spectrum Energy Inc (SEI)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Spectrum Energy Inc (SEI) is a company located in Elk Grove, California . References ↑ "Spectrum Energy Inc (SEI)" Retrieved from "http://en.openei.org/w/index.php?title=Spectrum_Energy_Inc_SEI&oldid=351613" Categories: Clean Energy Organizations Companies Organizations

219

Visible Spectrum Incandescent Selective Emitter  

SciTech Connect (OSTI)

The purpose of the work performed was to demonstrate the feasibility of a novel bi-layer selective emitter. Selective emitters are incandescent radiant bodies with emissivities that are substantially larger in a selected part of the radiation spectrum, thereby significantly shifting their radiated spectral distribution from that of a blackbody radiating at the same temperature. The major research objectives involved answering the following questions: (1) What maximum VIS/NIR radiant power and emissivity ratios can be attained at 2650 K? (2) What is the observed emitter body life and how does its performance vary with time? (3) What are the design tradeoffs for a dual heating approach in which both an internally mounted heating coil and electrical resistance self-heating are used? (4) What are the quantitative improvements to be had from utilizing a bi-layer emitter body with a low emissivity inner layer and a partially transmissive outer layer? Two approaches to obtaining selective emissivity were investigated. The first was to utilize large optical scattering within an emitter material with a spectral optical absorption that is much greater within the visible spectrum than that within the NIR. With this approach, an optically thick emitter can radiate almost as if optically thin because essentially, scattering limits the distance below the surface from which significant amounts of internally generated radiation can emerge. The performance of thin emitters was also investigated (for optically thin emitters, spectral emissivity is proportional to spectral absorptivity). These emitters were fabricated from thin mono-layer emitter rods as well as from bi-layer rods with a thin emitter layer mounted on a substrate core. With an initially estimated energy efficiency of almost three times that of standard incandescent bulbs, a number of energy, economic and environmental benefits such as less energy use and cost, reduced CO{sub 2} emissions, and no mercury contamination was initially projected. The work performed provided answers to a number of important questions. The first is that, with the investigated approaches, the maximum sustained emitter efficiencies are about 1.5 times that of a standard incandescent bulb. This was seen to be the case for both thick and thin emitters, and for both mono-layer and bi-layer designs. While observed VIS/NIR ratios represent improvements over standard incandescent bulbs, it does not appear sufficient to overcome higher cost (i.e. up to five times that of the standard bulb) and ensure commercial success. Another result is that high temperatures (i.e. 2650 K) are routinely attainable without platinum electrodes. This is significant for reducing material costs. A novel dual heating arrangement and insulated electrodes were used to attain these temperatures. Another observed characteristic of the emitter was significant grain growth soon after attaining operating temperatures. This is an undesirable characteristic that results in substantially less optical scattering and spectral selectivity, and which significantly limits emitter efficiencies to the values reported. Further work is required to address this problem.

Sonsight Inc.

2004-04-30T23:59:59.000Z

220

DOE/SEA-03; Special Environmental Analysis for the Department of Energy, National Nuclear Security Administration, Actions Taken in Response to the Cerro Grande Fire at Los Alamos National Laboratory, Los Alamos, New Mexico (September 2000)  

Broader source: Energy.gov (indexed) [DOE]

Analysis for Actions Taken in Response to the Cerro Grande Fire at LANL Analysis for Actions Taken in Response to the Cerro Grande Fire at LANL DOE/LAAO September 2000 S-1 SUMMARY The U.S. Department of Energy (DOE), National Nuclear Security Administration, is issuing this special environmental analysis (SEA) to document its assessment of impacts associated with emergency activities conducted at Los Alamos National Laboratory (LANL), Los Alamos County, New Mexico, in response to major disaster conditions caused by the recent wildfire known as the Cerro Grande Fire. This wildfire burned about 7,650 1 acres (ac) (3,061 hectares [ha]) within the boundaries of LANL and about an additional 35,500 ac (14,200 ha) in neighboring areas. DOE's emergency response to the threat of this fire began with certain preventative actions undertaken immediately before

Note: This page contains sample records for the topic "response spectrum 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

DOE/SEA-03; Special Environmental Analysis for the Department of Energy, National Nuclear Security Administration, Actions Taken in Response to the Cerro Grande Fire at Los Alamos National Laboratory, Los Alamos, New Mexico (September 2000)  

Broader source: Energy.gov (indexed) [DOE]

Analysis Analysis Actions taken in Response to the Cerro Grande Fire at Los Alamos National Laboratory, Los Alamos, New Mexico September 2000 U.S. Department of Energy Los Alamos Area Office Los Alamos, New Mexico for the Department of Energy, National Nuclear Security Administration DOE/SEA-03 COVER SHEET Responsible Agency: U.S. Department of Energy (DOE), National Nuclear Security Administration Title: Special Environmental Analysis for the Department of Energy, National Nuclear Security Administration, Actions Taken in Response to the Cerro Grande Fire at Los Alamos National Laboratory, Los Alamos, New Mexico Contacts: For further information on this Special Environmental Analysis (SEA) or to provide comments contact: Ms. Elizabeth Withers SEA Document Manager Los Alamos Area Office,

222

Wind noise and the spectrum of atmospheric turbulence pressure fluctuations  

Science Journals Connector (OSTI)

Previous research [S. Morgan and R. Raspet J. Acoust. Soc. Am. 92 1180–1183 (1992)] has shown that wind noise is predominantly caused by pressure fluctuations intrinsic to the turbulent atmospheric flow. Therefore it should be possible to predict wind noise from models for turbulent pressure spectra in the atmosphere. Based on simple dimensional analysis and an application of Taylor’s hypothesis the inertial?subrange power spectrum for turbulent pressure fluctuations should be proportional to f ?7/3 where f is frequency. But more recent atmospheric observations and theoretical arguments [J. D. Albertson G. G. Katul M. B. Parlange and W. E. Eichinger Phys. Fluids 10 1725–1732 (1998)] suggest that the power spectrum actually goes as f ?3/2. In this paper it is shown that the f ?3/2 dependence predicts a much slower decay in wind noise with increasing acoustic frequency than is typically observed. Possible reasons for this discrepancy are discussed.

2003-01-01T23:59:59.000Z

223

Global transcriptional analysis of short-term hepatic stress responses in Atlantic salmon (Salmo salar) exposed to depleted uranium  

Science Journals Connector (OSTI)

Abstract Potential environmental hazards of radionuclides are often studied at the individual level. Sufficient toxicogenomics data at the molecular/cellular level for understanding the effects and modes of toxic action (MoAs) of radionuclide is still lacking. The current article introduces transcriptomic data generated from a recent ecotoxicological study, with the aims to characterize the MoAs of a metallic radionuclide, deplete uranium (DU) in an ecologically and commercially important fish species, Atlantic salmon (Salmo salar). Salmon were exposed to three concentrations (0.25, 0.5 and 1.0 mg/L) of DU for 48 h. Short-term global transcriptional responses were studied using Agilent custom-designed high density 60,000-feature (60 k) salmonid oligonucleotide microarrays (oligoarray). The microarray datasets deposited at Gene Expression Omnibus (GEO ID: GSE58824) were associated with a recently published study by Song et al. (2014) in BMC Genomics. The authors describe the experimental data herein to build a platform for better understanding the toxic mechanisms and ecological hazard of radionuclides such as DU in fish.

You Song; Brit Salbu; Hans-Christian Teien; Lene Sørlie Heier; Bjørn Olav Rosseland; Tore Høgåsen; Knut Erik Tollefsen

2014-01-01T23:59:59.000Z

224

Distillation by repeated measurements: Continuous spectrum case  

SciTech Connect (OSTI)

Repeated measurements on one part of a bipartite system strongly affect the other part that is not measured, the dynamics of which is regulated by an effective contracted evolution operator. When the spectrum of this operator is discrete, the nonmeasured system is driven into a pure state, irrespective of the initial state, provided that the spectrum satisfies certain conditions. We show here that, even in the case of continuous spectrum, an effective distillation can occur under rather general conditions. We confirm it by applying our formalism to a simple model.

Bellomo, Bruno; Compagno, Giuseppe [CNISM and Dipartimento di Scienze Fisiche ed Astronomiche, Universita di Palermo, via Archirafi 36, IT-90123 Palermo (Italy); Nakazato, Hiromichi [Department of Physics, Waseda University, Tokyo 169-8555 (Japan); Yuasa, Kazuya [Waseda Institute for Advanced Study, Waseda University, Tokyo 169-8050 (Japan)

2010-12-15T23:59:59.000Z

225

Artificial Neural Network Processing of Stripping Analysis Responses for Identifying and Quantifying Heavy Metals in the Presence of Intermetallic Compound Formation  

Science Journals Connector (OSTI)

Artificial Neural Network Processing of Stripping Analysis Responses for Identifying and Quantifying Heavy Metals in the Presence of Intermetallic Compound Formation ... Using simulated data, modeled after complex interactions experimentally observed in samples containing Cu and Zn, it has been demonstrated that networks containing two layers of neurons (a nonlinear hidden layer and a linear output layer) can be trained to calculate concentrations under a variety of complicated situations. ... The output of any particular neuron in a feed-forward neural network is determined by passing the sum of the weighted inputs through a transfer function, where the transfer function can have any of a variety of forms (linear and sigmoidal transfer functions are most common). ...

Helen Chan; Alexander Butler; David M. Falck; Michael S. Freund

1997-07-01T23:59:59.000Z

226

Survey on Spectrum Utilization in Europe: Measurements, Analyses and Observations  

E-Print Network [OSTI]

major results and comparisons of radio spectrum utilization measurements that have been carried out and physical aspects that will have to be considered in the future radio spectrum management to assure efficient spectrum utilization. Keywords-cognitive radio, dynamic spectrum access, spectrum utilization

Paris-Sud XI, Université de

227

Cooperation and Learning in Multiuser Opportunistic Spectrum Access  

E-Print Network [OSTI]

for the efficient utilization of the radio frequency spectrum is opportunistic spectrum access (OSA), whereCooperation and Learning in Multiuser Opportunistic Spectrum Access Hua Liu§ , Bhaskar spectrum access net- work where spectrum opportunities are time varying and spatially inhomogeneous

Islam, M. Saif

228

MAP: Multiauctioneer Progressive Auction for Dynamic Spectrum Access  

E-Print Network [OSTI]

to access the licensed spectrum, and dynamic spectrum access (DSA) is one of the fundamental functions of CR solution according to the length of step. Index Terms--Cognitive radio, dynamic spectrum access, auction from scarcity in spectrum resource and inefficiency in spectrum usage. Cognitive radio (CR) or dynamic

Wang, Xinbing

229

ACTION SPECTRUM OF THE "SECOND EMERSON EFFECT"  

E-Print Network [OSTI]

at 670 mju in the action spectrum of the "second Emerson effect"' (22, 33), in the green alga Chlorella the fraction of total absorbed light absorbed by the accessory pigments (be it chlorophyll b in Chlorella

Govindjee

230

The 21-cm power spectrum after reionization  

Science Journals Connector (OSTI)

......spectrum (PS) following the completion of reionization. In contrast...uncertainty in the primordial PS index or through a running spectral index, which we have not considered...the 21-cm PS following the completion of reionization. Our approach......

J. Stuart B. Wyithe; Abraham Loeb

2009-08-21T23:59:59.000Z

231

Mass Spectrum, Actons and Cosmological Landscape  

E-Print Network [OSTI]

It is suggested that the properties of the mass spectrum of elementary particles could be related with cosmology. Solutions of the Klein-Gordon equation on the Friedmann type manifold with the finite action are constructed. These solutions (actons) have a discrete mass spectrum. We suggest that such solutions could select a universe from cosmological landscape. In particular the solutions with the finite action on de Sitter space are investigated.

V. V. Kozlov; I. V. Volovich

2006-12-13T23:59:59.000Z

232

Optimal Classifier Based Spectrum Sensing in Cognitive Radio Wireless Systems  

E-Print Network [OSTI]

Optimal Classifier Based Spectrum Sensing in Cognitive Radio Wireless Systems Siddharth Sharma tolerance. General Terms Algorithms, Theory, Reliability. Keywords Cognitive Radio; Cooperative Spectrum Cognitive radio (CR) networks have been proposed as a revolutionary breakthrough to enhance spectrum

Jagannatham, Aditya K.

233

GADRAS Detector Response Function.  

SciTech Connect (OSTI)

The Gamma Detector Response and Analysis Software (GADRAS) applies a Detector Response Function (DRF) to compute the output of gamma-ray and neutron detectors when they are exposed to radiation sources. The DRF is fundamental to the ability to perform forward calculations (i.e., computation of the response of a detector to a known source), as well as the ability to analyze spectra to deduce the types and quantities of radioactive material to which the detectors are exposed. This document describes how gamma-ray spectra are computed and the significance of response function parameters that define characteristics of particular detectors.

Mitchell, Dean J.; Harding, Lee; Thoreson, Gregory G; Horne, Steven M.

2014-11-01T23:59:59.000Z

234

SciTech Connect: Broad Spectrum Photoelectrochemical Diodes for...  

Office of Scientific and Technical Information (OSTI)

Broad Spectrum Photoelectrochemical Diodes for Solar Hydrogen Generation Citation Details In-Document Search Title: Broad Spectrum Photoelectrochemical Diodes for Solar Hydrogen...

235

Muon decay in orbit: Spectrum of high-energy electrons  

Science Journals Connector (OSTI)

Experimental searches for lepton-flavor-violating coherent muon-to-electron conversion in the field of a nucleus, have been proposed to reach the unprecedented sensitivity of 10-16–10-18 per stopped muon. At that level, they probe new interactions at effective-mass scales well beyond 1000 TeV. However, they must contend with background from ordinary bound muon decay. To better understa560nd the background-spectrum shape and rate, we have carried out a detailed analysis of Coulombic-bound-state muon decay, including nuclear recoil. Implications for future experiments are briefly discussed.

Andrzej Czarnecki, Xavier Garcia i Tormo, and William J. Marciano

2011-07-14T23:59:59.000Z

236

Management Responsibilities  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Management Responsibilities Management Responsibilities Depleted UF6 Management Responsibilities DOE has responsibility for safe and efficient management of approximately 700,000 metric tons of depleted UF6. Organizational Responsibilities In the United States, the U.S. Department of Energy is responsible for managing all the depleted uranium that has been generated by the government and has been declared surplus to national defense needs. In addition, as a result of two memoranda of agreement that have been signed between the DOE and USEC, the DOE has assumed management responsibility for approximately 145,000 metric tons of depleted UF6 that has been or will be generated by USEC. Any additional depleted UF6 that USEC generates will be USEC's responsibility to manage. DOE Management Responsibility

237

Hardening Neutron Spectrum for Advanced Actinides Transmutation Experiments in the ATR  

SciTech Connect (OSTI)

The most effective method for transmuting long-lived isotopes contained in spent nuclear fuel into shorter-lived fission products is in a fast neutron spectrum reactor. In the absence of a fast rest reactor in the United States, initial irradiation testing of candidate fuels can be performed in a thermal test reactor that has been modified to produce a test region with a hardened neutron spectrum. Such a test facility, with a spectrum similar but somewhat softer than that of the liquid-metal fast breeder reactor (LMFBR), has been constructed in the INEEL's Advanced Test Reactor (ATR). The radial fission power distribution of the actinide fuel pin, which is an important parameter in fission gas released modelling, needs to be accurately predicted and the hardened neturon spectrum in the ATR and the LMFBR fast neutron spectrum is compared. The comparison analyses in this study are peformed using MCWO, a well-developed tool that couples the Monte Carlo transport code MCNP with the isotope depletion and build-up code ORIGEN-2. MCWO analysis yields time-dependent and neutron-spectrum-dependent minor actinide and Pu concentrations and detailed radial fission power profile calculations for a typical fast reactor (LMFBR) neutron spectrum and the hardened neturon spectrum test region in the ATR. The MCWO-calculated results indicate that the cadmium basket used in the advanced fuel test assembly in the ATR can effectively depress the linear heat generation rate in the experimental fuels and harden the neutron spectrum in the test region.

G. S. Chang; R. G. Ambrosek

2004-05-01T23:59:59.000Z

238

The Power Spectrum of Rich Clusters of Galaxies on Large Spatial Scales  

E-Print Network [OSTI]

We present an analysis of the redshift-space power spectrum, $P(k)$, of rich clusters of galaxies based on an automated cluster catalogue selected from the APM Galaxy Survey. We find that $P(k)$ can be approximated by a power law, $P(k)\\proptok^{n}$, with $n\\approx-1.6$ over the wavenumber range $0.04\\hrspectrum has the same shape as the power spectra measured for optical and IRAS galaxies. This is consistent with a simple linear bias model in which different tracers have the same power spectrum as that of the mass distribution but shifted in amplitude by a constant biasing factor. On larger scales, the power spectrum of APM clusters flattens and appears to turn over on a scale $k \\sim 0.03\\hmpcrev$. We compare the power spectra estimated from simulated APM cluster catalogues to those estimated directly from cubical N-body simulation volumes and find that the APM cluster survey should give reliable estimates of the true power spectrum at wavenumbers $k \\simgt 0.02\\hmpcrev$. These results suggest that the observed turn-over in the power spectrum may be a real feature of the cluster distribution and that we have detected the transition to a near scale-invariant power spectrum implied by observations of anisotropies in the cosmic microwave background radiation. The scale of the turn-over in the cluster power spectrum is in good agreement with the scale of the turn-over observed in the power spectrum of APM galaxies.

Helen Tadros; George Efstathiou; Gavin Dalton

1997-08-28T23:59:59.000Z

239

$N$-boson spectrum from a Discrete Scale Invariance  

E-Print Network [OSTI]

We present the analysis of the $N$-boson spectrum computed using a soft two-body potential the strength of which has been varied in order to cover an extended range of positive and negative values of the two-body scattering length $a$ close to the unitary limit. The spectrum shows a tree structure of two states, one shallow and one deep, attached to the ground-state of the system with one less particle. It is governed by an unique universal function, $\\Delta(\\xi)$, already known in the case of three bosons. In the three-particle system the angle $\\xi$, determined by the ratio of the two- and three-body binding energies $E_3/E_2=\\tan^2\\xi$, characterizes the Discrete Scale Invariance of the system. Extending the definition of the angle to the $N$-body system as $E_N/E_2=\\tan^2\\xi$, we study the $N$-boson spectrum in terms of this variable. The analysis of the results, obtained for up to $N=16$ bosons, allows us to extract a general formula for the energy levels of the system close to the unitary limit. Interestingly, a linear dependence of the universal function as a function of $N$ is observed at fixed values of $a$. We show that the finite-range nature of the calculations results in the range corrections that generate a shift of the linear relation between the scattering length $a$ and a particular form of the universal function. We also comment on the limits of applicability of the universal relations.

A. Kievsky; N. K. Timofeyuk; M. Gattobigio

2014-05-10T23:59:59.000Z

240

1 Spectrum Sharing Games of Network Operators and Cognitive Radios  

E-Print Network [OSTI]

Contents 1 Spectrum Sharing Games of Network Operators and Cognitive Radios Mohammad Hossein advances in radio technology, the spectrum regulators have opened some parts of the available spectrum operators and cognitive radios. Because of the dynamic nature of spectrum sharing, it is difficult

Bencsáth, Boldizsár

Note: This page contains sample records for the topic "response spectrum 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

Robust Performance of Spectrum Sensing in Cognitive Radio Networks  

E-Print Network [OSTI]

1 Robust Performance of Spectrum Sensing in Cognitive Radio Networks Shimin Gong, Ping Wang) in cognitive radio networks requires SUs to be spectrum aware and know which spectrum bands are occupied by PUs and reduces the system sensitivity on decision variables. Index Terms Cognitive radio network, spectrum

Huang, Jianwei

242

Reputation Aware Collaborative Spectrum Sensing for Mobile Cognitive Radio Networks  

E-Print Network [OSTI]

Reputation Aware Collaborative Spectrum Sensing for Mobile Cognitive Radio Networks Abstract ­ The task of spectrum sensing for Dynamic Spectrum Access in Cognitive Radio Networks (CRNs) is very of Cognitive Radio (CR) operation is the opportunistic utilization of licensed spectrum bands by the Secondary

Zou, Cliff C.

243

Cryptographic Link Signatures for Spectrum Usage Authentication in Cognitive Radio  

E-Print Network [OSTI]

Cryptographic Link Signatures for Spectrum Usage Authentication in Cognitive Radio Xi Tan, Kapil frequency spectrum was inefficiently utilized. To fully use these spectrums, cognitive radio networks have of cognitive radio is to enable the current fixed spectrum channels assigned by Federal Communica- tions

Du, Wenliang "Kevin"

244

Toward Secure Distributed Spectrum Sensing in Cognitive Radio Networks  

E-Print Network [OSTI]

1 Toward Secure Distributed Spectrum Sensing in Cognitive Radio Networks Ruiliang Chen, Jung}@vt.edu Abstract Cognitive radio (CR) is a revolutionary technology that promises to alleviate the spectrum shortage problem and to bring about remarkable improvement in spectrum utilization. Spectrum sensing is one

245

SAMER: Spectrum Aware Mesh Routing in Cognitive Radio Networks  

E-Print Network [OSTI]

SAMER: Spectrum Aware Mesh Routing in Cognitive Radio Networks SHORT PAPER Ioannis Pefkianakis1 in licensed bands, to meet the increasing demand for radio spectrum. The new open spectrum operation--Cognitive Radio, Spectrum Aware Routing I. INTRODUCTION Cognitive radio networks (CORNET) are an emerging multihop

Lu, Songwu

246

Energy-efficient spectrum sensing for cognitive sensor networks  

E-Print Network [OSTI]

spectrum. Traditionally, radio spectrum allocation has been based on exclusive, licensed use of portions for newer wireless net- works and applications. Radio spectrum measurements [13] however indicate that large portions of spectrum licensed to wireless systems remain under-utilized. Consequently there is a growing

Leus, Geert

247

Scheduling Heterogeneous Wireless Systems for Efficient Spectrum Access  

E-Print Network [OSTI]

Radio approach for usage of the Virtual Unlicensed Spectrum (CORVUS) system exploits unoccupied licensed

Bao, Lichun; Liao, Shenghui

2010-01-01T23:59:59.000Z

248

Distributed Routing, Relay Selection, and Spectrum Allocation in Cognitive and  

E-Print Network [OSTI]

of the existing radio spectrum. Based on the reported evidence that static licensed spectrum allocation results--Throughput maximization is a key challenge in cognitive radio ad hoc networks, where the availability of local spectrum radio networks, dynamic spectrum allocation, routing, cross-layer de- sign. I. INTRODUCTION The need

Melodia, Tommaso

249

Federal Spectrum Management at the National Telecommunications and Information Administration  

Broader source: Energy.gov [DOE]

Slides from National Telecommunications and Information Administration's presentation on Federal spectrum management.

250

A Survey on Dynamic Spectrum Access Techniques for Cognitive Radio  

E-Print Network [OSTI]

Cognitive radio (CR) is a new paradigm that utilizes the available spectrum band. The key characteristic of CR system is to sense the electromagnetic environment to adapt their operation and dynamically vary its radio operating parameters. The technique of dynamically accessing the unused spectrum band is known as Dynamic Spectrum Access (DSA). The dynamic spectrum access technology helps to minimize unused spectrum bands. In this paper, main functions of Cognitive Radio (CR) i.e. spectrum sensing, spectrum management, spectrum mobility and spectrum sharing are discussed. Then DSA models are discussed along with different methods of DSA such as Command and Control, Exclusive-Use, Shared Use of Primary Licensed User and Commons method. Game-theoretic approach using Bertrand game model, Markovian Queuing Model for spectrum allocation in centralized architecture and Fuzzy logic based method are also discussed and result are shown.

Garhwal, Anita

2012-01-01T23:59:59.000Z

251

Performance Analysis of Dispersed Spectrum Cognitive Radio Systems  

E-Print Network [OSTI]

appreciation goes out to Dr. Wael, Nathan, Rakan, Joshua and all friends in College Station. I am also very thankful to my friends Saleh and Ahmad in Jordan. Special thanks to my uncle, Ziad Masad and my brothers, Mohammad, Manar, Murad, Majdi, and Muntaser...

Mohammad, Muneer

2011-02-22T23:59:59.000Z

252

Economic Viability of Dynamic Spectrum Management  

E-Print Network [OSTI]

and Economics Lab Department of Information Engineering The Chinese University of Hong Kong #12;#12;1 EconomicEconomic Viability of Dynamic Spectrum Management Jianwei Huang Network Communications efficiently. Successful im- plementation of DSM is not a pure engineering issue. It is also a complicated

Huang, Jianwei

253

Energy spectrum of cosmic-ray muons  

Science Journals Connector (OSTI)

The energy spectrum of cosmic-ray muons at sea-level is calculated by the ... in good agreement with the observed data of muons with the zenith angles of 0° and ... the scaling model is valid up to the muon energy

H. Komori; K. Mitsui

254

Spectrum of the Flame of Ethylene  

Science Journals Connector (OSTI)

1 December 1934 research-article Spectrum of the Flame of Ethylene W. M. Vaidya The Royal Society is collaborating with JSTOR to digitize, preserve, and extend access to Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences. www.jstor.org

1934-01-01T23:59:59.000Z

255

Microwave Absorption Spectrum of ND3  

Science Journals Connector (OSTI)

The main J=K sequence of inversion lines of the ND3 absorption spectrum were observed and measured between 1589 and 2540 Mc. Quantum numbers up to J, K=18, 18 were assigned by the use of an approximate empirical formula.

R. G. Nuckolls; L. J. Rueger; Harold Lyons

1953-03-01T23:59:59.000Z

256

EARS (Enhancing Access to the Radio Spectrum) PROGRAM: The radio spectrum is a finite but exceedingly valuable natural resource that  

E-Print Network [OSTI]

EARS (Enhancing Access to the Radio Spectrum) PROGRAM: The radio spectrum is a finite communications, among a multitude of others. During the last two decades, the use of the radio spectrum has on the topic of Enhancing Access to the Radio Spectrum. The charge to the workshop was "to identify

Cetiner, Bedri A.

257

Methods and apparatuses using filter banks for multi-carrier spread-spectrum signals  

DOE Patents [OSTI]

A transmitter includes a synthesis filter bank to spread a data symbol to a plurality of frequencies by encoding the data symbol on each frequency, apply a common pulse-shaping filter, and apply gains to the frequencies such that a power level of each frequency is less than a noise level of other communication signals within the spectrum. Each frequency is modulated onto a different evenly spaced subcarrier. A demodulator in a receiver converts a radio frequency input to a spread-spectrum signal in a baseband. A matched filter filters the spread-spectrum signal with a common filter having characteristics matched to the synthesis filter bank in the transmitter by filtering each frequency to generate a sequence of narrow pulses. A carrier recovery unit generates control signals responsive to the sequence of narrow pulses suitable for generating a phase-locked loop between the demodulator, the matched filter, and the carrier recovery unit.

Moradi, Hussein; Farhang, Behrouz; Kutsche, Carl A

2014-05-20T23:59:59.000Z

258

Methods and apparatuses using filter banks for multi-carrier spread-spectrum signals  

DOE Patents [OSTI]

A transmitter includes a synthesis filter bank to spread a data symbol to a plurality of frequencies by encoding the data symbol on each frequency, apply a common pulse-shaping filter, and apply gains to the frequencies such that a power level of each frequency is less than a noise level of other communication signals within the spectrum. Each frequency is modulated onto a different evenly spaced subcarrier. A demodulator in a receiver converts a radio frequency input to a spread-spectrum signal in a baseband. A matched filter filters the spread-spectrum signal with a common filter having characteristics matched to the synthesis filter bank in the transmitter by filtering each frequency to generate a sequence of narrow pulses. A carrier recovery unit generates control signals responsive to the sequence of narrow pulses suitable for generating a phase-locked loop between the demodulator, the matched filter, and the carrier recovery unit.

Moradi, Hussein; Farhang, Behrouz; Kutsche, Carl A

2014-10-14T23:59:59.000Z

259

Fluid Inclusion Gas Analysis  

SciTech Connect (OSTI)

Fluid inclusion gas analysis for wells in various geothermal areas. Analyses used in developing fluid inclusion stratigraphy for wells and defining fluids across the geothermal fields. Each sample has mass spectrum counts for 180 chemical species.

Dilley, Lorie

2013-01-01T23:59:59.000Z

260

Field Sampling and Analysis Plan for the Remedial Investigation of Waste Area Grouping 2 at Oak Ridge National Laboratory, Oak Ridge, Tennessee. Responses to comments  

SciTech Connect (OSTI)

This report provides responses to US Environmental Protection Agency Region IV EPA-M and Tennessee Department of Environment and Conservation Oversite Division (TDEC-O) comments on report ORNL/ER-58, Field Sampling and Analysis Plan for the Remedial Investigation of Waste Area Grouping 2 at Oak Ridge National Laboratory, Oak Ridge, Tennessee. Waste Area Grouping (WAG) 2 consists of the White Oak Creek (WOC) drainage system downgradient of the major ORNL WAGs in the WOC watershed. A strategy for the remedial investigation (RI) of WAG2 was developed in report ES/ER-14&Dl, Remedial Investigation Plan for Waste Area Grouping 2 at Oak Ridge National Laboratory, Oak Ridge, Tennessee. This strategy takes full advantage of WAG2`s role as an integrator of contaminant releases from the ORNL WAGs in the WOC watershed, and takes full advantage of WAG2`s role as a conduit for contaminants from the ORNL site to the Clinch River. The strategy calls for a multimedia environmental monitoring and characterization program to be conducted in WAG2 while upgradient contaminant sources are being remediated. This monitoring and characterization program will (1) identify and quantify contaminant fluxes, (2) identify pathways of greatest concern for human health and environmental risk, (3) improve conceptual models of contaminant movement, (4) support the evaluation of remedial alternatives, (5) support efforts to prioritize sites for remediation, (6) document the reduction in contaminant fluxes following remediation, and (7) support the eventual remediation of WAG2. Following this strategy, WAG2 has been termed an ``integrator WAG,`` and efforts in WAG2 over the short term are directed toward supporting efforts to remediate the contaminant ``source WAGS`` at ORNL.

Not Available

1992-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "response spectrum 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

The Energy Spectrum of Fronts: Time Evolution of Shocks in Burgers‚ Equation  

Science Journals Connector (OSTI)

Andrews and Hoskins used semigeostrophic theory to argue that the energy spectrum of a front should decay like the ?8/3 power of the wavenumber. They note, however, that their inviscid analysis is restricted to the very moment of breaking; that ...

John P. Boyd

1992-01-01T23:59:59.000Z

262

The host galaxies of Compact Steep Spectrum and Gigahertz-Peaked Spectrum radio sources  

E-Print Network [OSTI]

I will review some of the developments in studies of the host galaxy properties of Compact Steep Spectrum (CSS) and GigaHertz-Peaked Spectrum (GPS) radio sources. In contrast to previous reviews structured around observational technique, I will discuss the host galaxy properties in terms of morphology, stellar content and warm gas properties and discuss how compact, young radio-loud AGN are key objects for understanding galaxy evolution.

J. Holt

2008-12-15T23:59:59.000Z

263

Steps toward the power spectrum of matter. I.The mean spectrum of galaxies  

E-Print Network [OSTI]

We calculate the mean power spectrum of galaxies using published power spectra of galaxies and clusters of galaxies. On small scales we use the power spectrum derived from the 2-dimensional distribution of APM galaxies, on large scales we use power spectra derived from 3-dimensional data for galaxy and cluster samples. Spectra are reduced to real space and to the amplitude of the power spectrum of APM galaxies. Available data indicate the presence of two different populations in the nearby Universe. Clusters of galaxies sample a relatively large region in the Universe where rich, medium and poor superclusters are well represented. Their mean power spectrum has a spike on scale 120 h^{-1}Mpc, followed by an approximate power-law spectrum of index n = -1.9 towards small scales. The power spectrum found from LCRS and IRAS 1.2 Jy surveys is flatter around the maximum, which may represent regions of the Universe with medium-rich and poor superclusters.

J. Einasto; M. Einasto; E. Tago; A. A. Starobinsky; F. Atrio-Barandela; V. M"uller; A. Knebe; P. Frisch; R. Cen; H. Andernach; D. Tucker

1998-12-13T23:59:59.000Z

264

Energy Spectrum of Buoyancy-driven Turbulence  

E-Print Network [OSTI]

Using direct numerical simulation we demonstrate that stably stratified flows with large Richardson number follow Bolgiano-Obukhov scaling, i.e, the kinetic energy spectrum $E_u(k) \\sim k^{-11/5}$, the entropy spectrum $E_\\theta(k) \\sim k^{-7/5}$, and kinetic energy flux $\\Pi_u(k) \\sim k^{-4/5}$. This is due to the conversion of kinetic energy to potential energy because of buoyancy. We also demonstrate that $E_u(k) \\sim k^{-5/3}$ for stratified flow with weaker buoyancy or smaller Richardson number. We argue that due to the positive energy supply by buoyancy and non-decreasing $\\Pi_u(k)$, Rayleigh B\\'{e}nard convection should follow Kolmogorov-Obukhov scaling ($E_u(k) \\sim k^{-5/3}$).

Verma, Mahendra K; Chatterjee, Anando G

2014-01-01T23:59:59.000Z

265

Analysis  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (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

266

Power Spectrum in Krein Space Quantization  

E-Print Network [OSTI]

The power spectrum of scalar field and space-time metric perturbations produced in the process of inflation of universe, have been presented in this paper by an alternative approach to field quantization namely, Krein space quantization [1,2]. Auxiliary negative norm states, the modes of which do not interact with the physical world, have been utilized in this method. Presence of negative norm states play the role of an automatic renormalization device for the theory.

M. Mohsenzadeh; S. Rouhani; M. V. Takook

2008-11-06T23:59:59.000Z

267

The magnetic recoil spectrometer for measurements of the absolute neutron spectrum at OMEGA and the NIF  

SciTech Connect (OSTI)

The neutron spectrum produced by deuterium-tritium (DT) inertial confinement fusion implosions contains a wealth of information about implosion performance including the DT yield, ion-temperature, and areal-density. The Magnetic Recoil Spectrometer (MRS) has been used at both the OMEGA laser facility and the National Ignition Facility (NIF) to measure the absolute neutron spectrum from 3 to 30 MeV at OMEGA and 3 to 36 MeV at the NIF. These measurements have been used to diagnose the performance of cryogenic target implosions to unprecedented accuracy. Interpretation of MRS data requires a detailed understanding of the MRS response and background. This paper describes ab initio characterization of the system involving Monte Carlo simulations of the MRS response in addition to the commission experiments for in situ calibration of the systems on OMEGA and the NIF.

Casey, D. T.; Frenje, J. A.; Gatu Johnson, M.; Seguin, F. H.; Li, C. K.; Petrasso, R. D. [Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Glebov, V. Yu.; Katz, J.; Magoon, J.; Meyerhofer, D. D.; Sangster, T. C.; Shoup, M.; Ulreich, J. [Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States); Ashabranner, R. C.; Bionta, R. M.; Carpenter, A. C.; Felker, B.; Khater, H. Y.; LePape, S.; MacKinnon, A. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); and others

2013-04-15T23:59:59.000Z

268

Observation of the Ankle and Evidence for a High-Energy Break in the Cosmic Ray Spectrum  

E-Print Network [OSTI]

We have measured the cosmic ray spectrum at energies above $10^{17}$ eV using the two air fluorescence detectors of the High Resolution Fly's Eye experiment operating in monocular mode. We describe the detector, PMT and atmospheric calibrations, and the analysis techniques for the two detectors. We fit the spectrum to models describing galactic and extragalactic sources. Our measured spectrum gives an observation of a feature known as the ``ankle'' near $3\\times 10^{18}$ eV, and strong evidence for a suppression near $6\\times 10^{19}$ eV.

The High Resolution Fly's Eye Collaboration

2005-06-07T23:59:59.000Z

269

1569003080 1 Characterization of Spectrum Activities in the  

E-Print Network [OSTI]

interference, and policy performance with local and cooperative sensing. We analyze the collected data. Jung is with the Electrical and Computer Engineering Department, The University of California, Davis and dynamic spectrum policies, including regulation recommendations, secondary market spectrum leasing rulings

Liu, Xin

270

Centralized Collaborative Compressed Sensing of Wideband Spectrum for Cognitive Radios  

E-Print Network [OSTI]

1 Centralized Collaborative Compressed Sensing of Wideband Spectrum for Cognitive Radios Hessam, spectrum sensing, cognitive radio, distri- bution discontinuities, algebraic detection, wideband. I technique for cognitive radio systems which combines algebraic tools and compressive sampling techniques

Paris-Sud XI, Université de

271

A day in the life of the RF spectrum  

E-Print Network [OSTI]

There is a misguided perception that RF spectrum space is fully allocated and fully used though even a superficial study of actual spectrum usage by measuring local RF energy shows it largely empty of radiation. Traditional ...

Cooley, James E. (James Edward)

2005-01-01T23:59:59.000Z

272

Risk assessment for the Waste Technologies Industries (WTI) hazardous waste incineration facility (East Liverpool, Ohio). Volume 8. Additional analysis in response to peer review recommendations  

SciTech Connect (OSTI)

Contents: Introduction; Combustion Engineering; Air Dispersion and Deposition Modeling; Accident Analysis; Exposure Assessment; Toxicology; and Ecological Risk Assessment.

NONE

1997-05-01T23:59:59.000Z

273

Sequential Detection based Cooperative Spectrum Sensing Algorithms in Cognitive Radio  

E-Print Network [OSTI]

Sequential Detection based Cooperative Spectrum Sensing Algorithms in Cognitive Radio Arun considers the problem of Spectrum Sensing in Cognitive Radio Networks. For this we use a recently developed is not experienced by our algorithm. Keywords-Cognitive Radio, Cooperative Spectrum Sensing, Decentralized Sequential

Sharma, Vinod

274

Competitive Interference-aware Spectrum Access in Cognitive Radio Networks  

E-Print Network [OSTI]

Competitive Interference-aware Spectrum Access in Cognitive Radio Networks Jocelyne Elias, Fabio studies the spectrum access problem in cognitive radio networks from a game theoretical perspective. Finally, we provide numerical results of the proposed spectrum access game in several cognitive radio

Boyer, Edmond

275

High Throughput Spectrum-aware Routing for Cognitive Radio Networks  

E-Print Network [OSTI]

High Throughput Spectrum-aware Routing for Cognitive Radio Networks Ashwin Sampath, Lei Yang, Lili, wireless nodes equipped with cognitive radios [11] do not operate on statically as- signed spectrum who own the spectrum, e.g. analog TV broadcast stations. Such flexibility means cognitive radios can

Zhao, Ben Y.

276

Spectrum Leasing via Distributed Cooperation in Cognitive Radio  

E-Print Network [OSTI]

Spectrum Leasing via Distributed Cooperation in Cognitive Radio Igor Stanojev1 , Osvaldo Simeone1 for cognitive radio. I. INTRODUCTION Cognitive radio is a debated new paradigm for efficient spectrum or unlicensed model [1], requires secondary users to first sense the radio environment in search of spectrum

Yener, Aylin

277

Spectrum Leasing via Distributed Cooperation in Cognitive Radio  

E-Print Network [OSTI]

Spectrum Leasing via Distributed Cooperation in Cognitive Radio Igor Stanojev1, Osvaldo Simeone1 for cognitive radio. I. INTRODUCTION Cognitive radio is a debated new paradigm for efficient spectrum or unlicensed model [1], requires secondary users to first sense the radio environment in search of spectrum

Simeone, Osvaldo

278

Censored Truncated Sequential Spectrum Sensing for Cognitive Radio Networks  

E-Print Network [OSTI]

1 Censored Truncated Sequential Spectrum Sensing for Cognitive Radio Networks Sina Maleki Geert Leus Abstract Reliable spectrum sensing is a key functionality of a cognitive radio network. Cooperative spectrum sensing improves the detection reliability of a cognitive radio system but also increases

Leus, Geert

279

Collaborative Spectrum Sensing from Sparse Observations in Cognitive Radio Networks  

E-Print Network [OSTI]

1 Collaborative Spectrum Sensing from Sparse Observations in Cognitive Radio Networks Jia (Jasmine for the implementation of cognitive radio. Collaborative spectrum sensing among the cognitive radio nodes is expected to improve the ability of checking complete spectrum usage. Due to hardware limitations, each cognitive radio

Yin, Wotao

280

Demonstration of Real-time Spectrum Sensing for Cognitive Radio  

E-Print Network [OSTI]

Demonstration of Real-time Spectrum Sensing for Cognitive Radio Zhe Chen, Nan Guo, and Robert C sensing detects the availability of the radio frequency spectrum in a real-time fashion, which is essen Cognitive radio (CR) has been put forward to make effi- cient use of scarce radio frequency spectrum

Qiu, Robert Caiming

Note: This page contains sample records for the topic "response spectrum 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

Two Phase Spectrum Sharing for Frequency-Agile Radio Networks  

E-Print Network [OSTI]

1 Two Phase Spectrum Sharing for Frequency-Agile Radio Networks Zhenhua Feng and Yaling Yang of modern radios. We solve a joint spectrum sharing and end-to-end rate control problems for general technologies (e.g. software defined radio and cognitive radios) enable more flexible spectrum access through

Ha, Dong S.

282

Throughput Enhancing Cooperative Spectrum Sensing Strategies for Cognitive Radios  

E-Print Network [OSTI]

Throughput Enhancing Cooperative Spectrum Sensing Strategies for Cognitive Radios Kyounghwan Lee growth of wireless services continues to accelerate the exhaustion of usable radio spectrum. The radio channels licensed to the primary users. A main chal- lenge in this case is to design a spectrum sensing

Yener, Aylin

283

Quickest Spectrum Detection Using Hidden Markov Model for Cognitive Radio  

E-Print Network [OSTI]

Quickest Spectrum Detection Using Hidden Markov Model for Cognitive Radio Zhe Chen, Zhen Hu, Robert and recognition under the umbrella of cognitive radio. In the procedure of spectrum recognition, a frequency) opened free white space spectrum on November 4, 2008 [1]. Cognitive radio has been put forward as a more

Qiu, Robert Caiming

284

Partial Cooperation for Spectrum Sharing in Cognitive Radio Network  

E-Print Network [OSTI]

Partial Cooperation for Spectrum Sharing in Cognitive Radio Network Lok Man Law1, Fen Hou2, Jianwei that many licensed radio spectrums are heavily under-utilized. Cognitive radio technology can improve spectrum, without affecting the normal communications of the primary licensed users. In cognitive radio

Paris-Sud XI, Université de

285

Partial Cooperation for Spectrum Sharing in Cognitive Radio Network  

E-Print Network [OSTI]

that many licensed radio spectrums are heavily under-utilized. Cognitive radio technology can improve spectrum, without affecting the normal communications of the primary licensed users. In cognitive radioPartial Cooperation for Spectrum Sharing in Cognitive Radio Network Lok Man Law1, Fen Hou2, Jianwei

Huang, Jianwei

286

Competition and bargaining in wireless networks with spectrum leasing  

E-Print Network [OSTI]

which have bought a license, giving them the exclusive right to use a fixed part of the radio spectrum a license which gives it the right to use spectrum, while the MVNO is a Secondary Operator (SO), which leases a fraction of the spectrum licensed to the PO. The SO is assumed to have deployed a new technology

Paris-Sud XI, Université de

287

ICST Transactions Preprint Cooperation Scheme For Distributed Spectrum  

E-Print Network [OSTI]

ICST Transactions Preprint Cooperation Scheme For Distributed Spectrum Sensing In Cognitive Radio, Philadelphia, PA 19122 Abstract Spectrum sensing is an essential phase in cognitive radio networks (CRNs). It enables secondary users (SUs) to access licensed spectrum, which is temporarily not occupied

Wu, Jie

288

Robust Distributed Spectrum Sensing in Cognitive Radio Networks  

E-Print Network [OSTI]

unlicensed radios to operate in licensed spectrum, provided no harmful interference is expe- riencedRobust Distributed Spectrum Sensing in Cognitive Radio Networks Ruiliang Chen, Jung-Min Park {rlchen, jungmin, kgbian}@vt.edu Abstract--Distributed spectrum sensing (DSS) enables a Cog- nitive Radio

289

Cognitive Radio Networks: How much Spectrum Sharing is Optimal?  

E-Print Network [OSTI]

Cognitive Radio Networks: How much Spectrum Sharing is Optimal? Sudhir Srinivasa and Syed Ali Jafar the traditional `divide and set aside' approach to spectrum regulation ensures that the licensed (primary) users periodically monitors the radio spectrum, intelligently detects occupancy in the different frequency bands

Jafar, Syed A.

290

Spread-spectrum Cognitive Networking: Distributed Channelization and Routing  

E-Print Network [OSTI]

Mainstream cognitive radio proposals focus on opportunistic access to the licensed spectrum where the primary. Moreover, in cognitive radio networks with multi-hop communication requirements, spectrum occupancy or secondary users. In this way, the secondary users share the licensed spectrum with the primary users

Melodia, Tommaso

291

On the Characteristics of Spectrum-Agile Communication Networks  

E-Print Network [OSTI]

space" in radio spectrum, varying on frequency, time, and geographic locations. Thus, it is likely and general observations indicate that much of the radio spectrum is not in use for a significant amount on the opportunistic spectrum utilization by users other than the primary licensed ones on a non-interfering or leasing

Liu, Xin

292

Ensuring Trustworthy Spectrum Sensing in Cognitive Radio Networks  

E-Print Network [OSTI]

Ensuring Trustworthy Spectrum Sensing in Cognitive Radio Networks Ruiliang Chen and Jung-Min Park to coexist with incumbent users in licensed spectrum bands without inducing interference to incumbent--Cognitive Radio, Spectrum Sensing, Primary User Emulation Attack, Location Verification. I. INTRODUCTION The need

293

Spectrum Investment with Uncertainty Based on Prospect Theory  

E-Print Network [OSTI]

Spectrum Investment with Uncertainty Based on Prospect Theory Junlin Yu, Man Hon Cheung, and Jianwei Huang Abstract--We study a secondary wireless operator's spectrum investment problem under is uncertain. We formulate such a hybrid spectrum investment problem as a two-stage optimization prob- lem

Huang, Jianwei

294

Nonlinear Energy Transfer in a Narrow Gravity-Wave Spectrum  

Science Journals Connector (OSTI)

...research-article Nonlinear Energy Transfer in a Narrow Gravity-Wave Spectrum J. C...calculation of the rate of energy transfer due to...a narrow gravity wave spectrum according...typical narrow wind wave spectrum on the nonlinear energy transfer are very...

1979-01-01T23:59:59.000Z

295

Neutrino mass spectrum and neutrinoless double beta decay  

E-Print Network [OSTI]

The relations between the effective Majorana mass of the electron neutrino, $m_{ee}$, responsible for neutrinoless double beta decay, and the neutrino oscillation parameters are considered. We show that for any specific oscillation pattern $m_{ee}$ can take any value (from zero to the existing upper bound) for normal mass hierarchy and it can have a minimum for inverse hierarchy. This means that oscillation experiments cannot fix in general $m_{ee}$. Mass ranges for $m_{ee}$ can be predicted in terms of oscillation parameters with additional assumptions about the level of degeneracy and the type of hierarchy of the neutrino mass spectrum. These predictions for $m_{ee}$ are systematically studied in the specific schemes of neutrino mass and flavor which explain the solar and atmospheric neutrino data. The contributions from individual mass eigenstates in terms of oscillation parameters have been quantified. We study the dependence of $m_{ee}$ on the non-oscillation parameters: the overall scale of the neutrino mass and the relative mass phases. We analyze how forthcoming oscillation experiments will improve the predictions for $m_{ee}$. On the basis of these studies we evaluate the discovery potential of future \\znbb decay searches. The role \\znbb decay searches will play in the reconstruction of the neutrino mass spectrum is clarified. The key scales of $m_{ee}$, which will lead to the discrimination among various schemes are: $m_{ee} \\sim 0.1$ eV and $m_{ee} \\sim 0.005$ eV.

H. V. Klapdor-Kleingrothaus; H. Päs; A. Y. Smirnov

2000-10-08T23:59:59.000Z

296

Hawking spectrum and high frequency dispersion  

Science Journals Connector (OSTI)

We study the spectrum of created particles in two-dimensional black hole geometries for a linear, Hermitian scalar field satisfying a Lorentz noninvariant field equation with higher spatial derivative terms that are suppressed by powers of a fundamental momentum scale k0. The preferred frame is the "free-fall frame" of the black hole. This model is a variation of Unruh's sonic black hole analogy. We find that there are two qualitatively different types of particle production in this model: a thermal Hawking flux generated by "mode conversion" at the black hole horizon, and a nonthermal spectrum generated via scattering off the background into negative free-fall frequency modes. This second process has nothing to do with black holes and does not occur for the ordinary wave equation because such modes do not propagate outside the horizon with positive Killing frequency. The horizon component of the radiation is astonishingly close to a perfect thermal spectrum: for the smoothest metric studied, with Hawking temperature TH?0.0008k0, agreement is of order (THk0)3 at frequency ?=TH, and agreement to order THk0 persists out to ?TH?45 where the thermal number flux is ?10-20. The flux from scattering dominates at large ? and becomes many orders of magnitude larger than the horizon component for metrics with a "kink," i.e., a region of high curvature localized on a static world line outside the horizon. This nonthermal flux amounts to roughly 10% of the total luminosity for the kinkier metrics considered. The flux exhibits oscillations as a function of frequency which can be explained by interference between the various contributions to the flux.

Steven Corley and Ted Jacobson

1996-07-15T23:59:59.000Z

297

Optical Absorption Spectrum of AgF  

Science Journals Connector (OSTI)

The optical absorption of thin films of silver monofluoride has been investigated in the visible and ultraviolet region of the spectrum at room and low temperatures. Exciton peaks have been observed at 4.63 and 6.34 eV for samples at 4.8 °K. The first exciton peak is considerably lower in energy than might be expected on the basis of the trend set by the other silver halides. This unusually low energy has led us to speculate that the band structure of AgF may be quite different from those of the other silver halides.

Alfred P. Marchetti and G. L. Bottger

1971-04-15T23:59:59.000Z

298

Raman Spectrum of Graphene and Graphene Layers  

Science Journals Connector (OSTI)

Graphene is the two-dimensional building block for carbon allotropes of every other dimensionality. We show that its electronic structure is captured in its Raman spectrum that clearly evolves with the number of layers. The D peak second order changes in shape, width, and position for an increasing number of layers, reflecting the change in the electron bands via a double resonant Raman process. The G peak slightly down-shifts. This allows unambiguous, high-throughput, nondestructive identification of graphene layers, which is critically lacking in this emerging research area.

A. C. Ferrari; J. C. Meyer; V. Scardaci; C. Casiraghi; M. Lazzeri; F. Mauri; S. Piscanec; D. Jiang; K. S. Novoselov; S. Roth; A. K. Geim

2006-10-30T23:59:59.000Z

299

The Angular Momentum Content and Evolution of Class I and Flat-Spectrum Protostars  

E-Print Network [OSTI]

We report on the angular momentum content of heavily embedded protostars based on our analysis of the projected rotation velocities (v sin i s) of 38 Class I/flat spectrum young stellar objects presented by Doppmann et al (2005). After correcting for projection effects, we find that infrared-selected Class I/flat spectrum objects rotate significantly more quickly (median equatorial rotation velocity ~ 38 km/sec) than Classical T Tauri stars (CTTSs; median equatorial rotation velocity ~ 18 km/sec) in the Rho Ophiuchi and Taurus-Aurigae regions. The detected difference in rotation speeds between Class I/flat spectrum sources and CTTSs proves difficult to explain without some mechanism which transfers angular momentum out of the protostar between the two phases. Assuming Class I/flat spectrum sources possess physical characteristics (M_*,R_*,B_*) typical of pre-main sequence stars, fully disk locked Class I objects should have co-rotation radii within their protostellar disks that match well (within 30%) with the predicted magnetic coupling radii of Shu et al (1994). The factor of two difference in rotation rates between Class I/flat spectrum and CTTS sources, when interpreted in the context of disk locking models, also imply a factor of 5 or greater difference in mass accretion rates between the two phases.

Kevin R. Covey; Thomas P. Greene; Greg W. Doppmann; Charles J. Lada

2005-02-23T23:59:59.000Z

300

Quantum-classical correspondence in response theory  

E-Print Network [OSTI]

In this thesis, theoretical analysis of correspondence between classical and quantum dynamics is studied in the context of response theory. Thesis discusses the mathematical origin of time-divergence of classical response ...

Kryvohuz, Maksym

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "response spectrum 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

The Optical Spectrum of the Vela Pulsar  

E-Print Network [OSTI]

Our knowledge of the optical spectra of Isolated Neutron Stars (INSs) is limited by their intrinsic faintness. Among the fourteen optically identified INSs, medium resolution spectra have been obtained only for a handful of objects. No spectrum has been published yet for the Vela pulsar (PSR B0833-45), the third brightest (V=23.6) INS with an optical counterpart. Optical multi-band photometry underlines a flat continuum.In this work we present the first optical spectroscopy observations of the Vela pulsar, performed in the 4000-11000 A spectral range.Our observations have been performed at the ESO VLT using the FORS2 instrument. The spectrum of the Vela pulsar is characterized by a flat power-law (alpha = -0.04 +/- 0.04), which compares well with the values obtained from broad-band photometry. This confirms, once more, that the optical emission of Vela is entirely of magnetospheric origin. The comparison between the optical spectral indeces of rotation-powered INSs does not show evidence for a spectral evolution suggesting that, as in the X-rays, the INS aging does not affect the spectral properties of the magnetospheric emission. At the same time, the optical spectral indeces are found to be nearly always flatter then the X-rays ones, clearly suggesting a general spectral turnover at lower energies.

R. P. Mignani; S. Zharikov; P. A. Caraveo

2007-07-13T23:59:59.000Z

302

Spectrum Management for Cognitive Radio based on Genetics Algorithm  

E-Print Network [OSTI]

Spectrum scarceness is one of the major challenges that the present world is facing. The efficient use of existing licensed spectrum is becoming most critical as growing demand of the radio spectrum. Different researches show that the use of licensed are not utilized inefficiently. It has been also shown that primary user does not use more than 70% of the licensed frequency band most of the time. Many researchers are trying to found the techniques that efficiently utilize the under-utilized licensed spectrum. One of the approaches is the use of "Cognitive Radio". This allows the radio to learn from its environment, changing certain parameters. Based on this knowledge the radio can dynamically exploit the spectrum holes in the licensed band of the spectrum. This paper w i l l focus on the performance of spectrum allocation technique, based on popular meta-heuristics Genetics Algorithm and analyzing the performance of this technique using Mat Lab.

Singh, Santosh Kumar; Pathak, Vibhakar; Roy, Dr Krishna Chandra

2011-01-01T23:59:59.000Z

303

Adaptive transmission schemes of cognitive radio for dynamic spectrum access using wavelets and multiwavelets.  

E-Print Network [OSTI]

??Electromagnetic spectrum is a natural resource and at present its use is regulated by fixed spectrum assignment policy. That is, spectrum is assigned to license… (more)

Manju Mathew.

2012-01-01T23:59:59.000Z

304

Quantitative Analysis of Spectral Impacts on Silicon Photodiode Radiometers  

SciTech Connect (OSTI)

Inexpensive broadband pyranometers with silicon photodiode detectors have a non-uniform spectral response over the spectral range of 300-1100 nm. The response region includes only about 70% to 75% of the total energy in the terrestrial solar spectral distribution from 300 nm to 4000 nm. The solar spectrum constantly changes with solar position and atmospheric conditions. Relative spectral distributions of diffuse hemispherical irradiance sky radiation and total global hemispherical irradiance are drastically different. This analysis convolves a typical photodiode response with SMARTS 2.9.5 spectral model spectra for different sites and atmospheric conditions. Differences in solar component spectra lead to differences on the order of 2% in global hemispherical and 5% or more in diffuse hemispherical irradiances from silicon radiometers. The result is that errors of more than 7% can occur in the computation of direct normal irradiance from global hemispherical irradiance and diffuse hemispherical irradiance using these radiometers.

Myers, D. R.

2011-01-01T23:59:59.000Z

305

Quantitative Analysis of Spectral Impacts on Silicon Photodiode Radiometers: Preprint  

SciTech Connect (OSTI)

Inexpensive broadband pyranometers with silicon photodiode detectors have a non-uniform spectral response over the spectral range of 300-1100 nm. The response region includes only about 70% to 75% of the total energy in the terrestrial solar spectral distribution from 300 nm to 4000 nm. The solar spectrum constantly changes with solar position and atmospheric conditions. Relative spectral distributions of diffuse hemispherical irradiance sky radiation and total global hemispherical irradiance are drastically different. This analysis convolves a typical photodiode response with SMARTS 2.9.5 spectral model spectra for different sites and atmospheric conditions. Differences in solar component spectra lead to differences on the order of 2% in global hemispherical and 5% or more in diffuse hemispherical irradiances from silicon radiometers. The result is that errors of more than 7% can occur in the computation of direct normal irradiance from global hemispherical irradiance and diffuse hemispherical irradiance using these radiometers.

Myers, D. R.

2011-04-01T23:59:59.000Z

306

Chapter 9: Photovoltaic DevicesChapter 9: Photovoltaic Devices Solar energy spectrumSolar energy spectrum  

E-Print Network [OSTI]

Chapter 9: Photovoltaic DevicesChapter 9: Photovoltaic Devices Solar energy spectrumSolar energy Solar Energy? · Clean · Nearly unlimited PHYS5320 Chapter Nine 3 #12;S l ll l t PHYS5320 Chapter Nine 4 Solar cell plant #12;Cars powered by photovoltaic devices PHYS5320 Chapter Nine 5 #12;Solar Energy

Wang, Jianfang

307

Systems-Wide Analysis of Acclimation Responses to Long-Term Heat Stress and Recovery in the Photosynthetic Model Organism Chlamydomonas reinhardtii  

Science Journals Connector (OSTI)

...Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario N1G2W1, Canada [W] Online version contains Web-only data. [OPEN] Articles can be viewed online without a subscription. Early acclimation responses of Chlamydomonas to...

Dorothea Hemme; Daniel Veyel; Timo Mühlhaus; Frederik Sommer; Jessica Jüppner; Ann-Katrin Unger; Michael Sandmann; Ines Fehrle; Stephanie Schönfelder; Martin Steup; Stefan Geimer; Joachim Kopka; Patrick Giavalisco; Michael Schroda

2014-11-18T23:59:59.000Z

308

Symmetry and Dirac points in graphene spectrum  

E-Print Network [OSTI]

Existence and stability of Dirac points in the dispersion relation of operators periodic with respect to the hexagonal lattice is investigated for different sets of additional symmetries. The following symmetries are considered: rotation by $2\\pi/3$ and inversion, rotation by $2\\pi/3$ and horizontal reflection, inversion or reflection with weakly broken rotation symmetry, and the case where no Dirac points arise: rotation by $2\\pi/3$ and vertical reflection. All proofs are based on symmetry considerations and are elementary in nature. In particular, existence of degeneracies in the spectrum is proved by a transplantation argument (which is deduced from the (co)representation of the relevant symmetry group). The conical shape of the dispersion relation is obtained from its invariance under rotation by $2\\pi/3$. Persistence of conical points when the rotation symmetry is weakly broken is proved using a geometric phase in one case and parity of the eigenfunctions in the other.

Gregory Berkolaiko; Andrew Comech

2014-12-28T23:59:59.000Z

309

The Spectrum of AgD  

Science Journals Connector (OSTI)

The spectrum of AgD has been photographed at high dispersion with an Ag arc in an atmosphere of deuterium as a source. Quantum analyses of the 0,0 and 1,1 bands are presented. The value ?e=3.2595 is found for the lower state. Comparing this with the corresponding value for AgH, the ratio BeiBe for the two isotopic molecules is 0.50511, whereas the ratio of the reduced masses, by using Aston's latest values for the masses of the H and D atoms, is 0.50497. Calculation of the corrections to Be for the anharmonic oscillator as given by J. L. Dunham shows them to affect the Be ratio inappreciably.

Philip G. Koontz

1935-07-15T23:59:59.000Z

310

End of the cosmic neutrino energy spectrum  

E-Print Network [OSTI]

There may be a high-energy cutoff of neutrino events in IceCube data. In particular, IceCube does not observe the Standard Model Glashow-resonance events expected at 6.3 PeV. There are also no higher-energy neutrino signatures in the ANITA and Auger experiments. This absence of high-energy neutrino events motivates models with a fundamental restriction on neutrino energies above a few PeV. The simplest scenario to terminate the neutrino spectrum is Lorentz-invariance violating with a limiting neutrino velocity that is smaller than the speed of light. A consequence is that charged pions are stable above four times the maximum neutrino energy and may serve as a cosmic ray primary.

Anchordoqui, L A; Goldberg, H; Learned, J G; Marfatia, D; Pakvasa, S; Paul, T C; Weiler, T J

2014-01-01T23:59:59.000Z

311

Prompt Fission Neutron Spectrum of Pu241  

Science Journals Connector (OSTI)

The energy distribution of prompt neutrons resulting from the thermal-neutron-induced fission of Pu241 is measured. Fast time-of-flight techniques are employed in the neutron energy range 0.3 to 6.0 Mev. Proton recoils in emulsions are utilized for the measurement of neutron energies from 1.6 to 7.0 Mev. The experimentally determined Pu241 fission neutron spectrum is well represented by the Maxwellian distribution, N(E)?E12e-ET, where E is the neutron energy in Mev, N(E) the number of neutrons per unit energy interval, and T=1.335±0.034 Mev. The measured average Pu241 fission neutron energy is 2.002±0.051 Mev.

A. B. Smith; R. K. Sjoblom; J. H. Roberts

1961-09-15T23:59:59.000Z

312

Measures of the glottal source spectrum.  

E-Print Network [OSTI]

M. K. , & Antoñanzas- Barroso, N. (1985). Measures of88. Javkin, H. , Antoñanzas-Barroso, N. , & Maddieson, I. (B. R. , & Antoñanzas-Barroso, N. (2006). Analysis and

Kreiman, Jody; Gerratt, Bruce R; Antoñanzas-Barroso, Norma

2007-01-01T23:59:59.000Z

313

Energy spectrum of cosmic ray muons in ?100 TeV energy region reconstructed from the BUST data  

Science Journals Connector (OSTI)

Inclusive differential and integral energy spectra of cosmic ray muons in the energy range from several TeV to ?1 PeV obtained by means of the analysis of multiple interactions of muons (pair meter technique) in the Baksan underground scintillation telescope (BUST) are presented. The results are compared with preceding BUST data on muon energy spectrum based on electromagnetic cascade shower measurements and depth-intensity curve analysis, with calculations for different muon spectrum models, and also with data of other experiments.

A.G. Bogdanov; R.P. Kokoulin; Yu.F. Novoseltsev; R.V. Novoseltseva; V.B. Petkov; A.A. Petrukhin

2012-01-01T23:59:59.000Z

314

On Spectrum Selection Games in Cognitive Radio Ilaria Malanchini, Matteo Cesana, Nicola Gatti  

E-Print Network [OSTI]

On Spectrum Selection Games in Cognitive Radio Networks Ilaria Malanchini, Matteo Cesana, Nicola to evalu- ate spectrum management functionalities in Cognitive Radio Net- works. The spectrum selection environment, consequently exploiting under-utilized spectrum portions. The motivation for cognitive radio

Gatti, Nicola

315

Abstract--Flexible spectrum sharing is widely seen to be important feature for the future  

E-Print Network [OSTI]

systems. Efficient implementation of spectrum sharing requires novel radio resource management (RRM the spectrum sharing with systems using other radio access technologies. The proposed architecture provides. Index Terms -- Beyond 3G systems, flexible spectrum use, radio resource management, spectrum sharing

316

Spectrum Sensing via Universal Source Coding Jithin K. Sreedharan and Vinod Sharma  

E-Print Network [OSTI]

(Cognitive Radios) to identify the primary (licensed) user's spectrum usage via spectrum sensing. Given. These algorithms are motivated from spectrum sensing application in Cognitive Radios. Universal sequential Radios using universal codes is also considered. Keywords- Cognitive Radio, Spectrum Sensing, Sequential

Sharma, Vinod

317

Power spectrum of the fluctuation of Chebyshev's prime counting function  

E-Print Network [OSTI]

The one-sided power spectrum of the fluctuation of Chebyshev's weighted prime counting function is numerically estimated based on samples of the fluctuating function of different sizes. The power spectrum is also estimated analytically for large frequency based on Riemann hypothesis and the exact formula for the fluctuating function in terms of all the non-trivial Riemann zeroes. Our analytical estimate is consistent with our numerical estimate of a 1/f^2 power spectrum.

Boon Leong Lan; Shaohen Yong

2005-06-20T23:59:59.000Z

318

Rotational-level mixing and intracollisional interference in the pure rotational spectrum of HD gas  

Science Journals Connector (OSTI)

Rotational-level mixing by anisotropic intermolecular forces is found to be important to the mechanism which produces intracollisional interference effects in the pure rotational spectrum of HD and HD–inert-gas mixtures. The major contribution involves the anisotropic repulsive term in the potential and the anisotropic overlap-induced dipole moment. Improved agreement between calculation and experiment results when the mixing is included in the analysis.

G. C. Tabisz and J. Bradley Nelson

1985-02-01T23:59:59.000Z

319

Bright and fast voltage reporters across the visible spectrum via electrochromic FRET (eFRET)  

E-Print Network [OSTI]

We present a palette of brightly fluorescent genetically encoded voltage indicators (GEVIs) with excitation and emission peaks spanning the visible spectrum, sensitivities from 6 - 10% Delta F/F per 100 mV, and half-maximal response times from 1 - 7 ms. A fluorescent protein is fused to an Archaerhodopsin-derived voltage sensor. Voltage-induced shifts in the absorption spectrum of the rhodopsin lead to voltage-dependent nonradiative quenching of the appended fluorescent protein. Through a library screen, we identified linkers and fluorescent protein combinations which reported neuronal action potentials in cultured rat hippocampal neurons with a single-trial signal-to-noise ratio from 6.6 to 11.6 in a 1 kHz imaging bandwidth at modest illumination intensity. The freedom to choose a voltage indicator from an array of colors facilitates multicolor voltage imaging, as well as combination with other optical reporters and optogenetic actuators.

Zou, Peng; Douglass, Adam D; Hochbaum, Daniel R; Brinks, Daan; Werley, Christopher A; Harrison, D Jed; Campbell, Robert E; Cohen, Adam E

2014-01-01T23:59:59.000Z

320

An hybrid Tykhonov method for neutron spectrum unfolding  

E-Print Network [OSTI]

An hybrid iterative Tykhonov regularization approach with an accelerating algorithm is considered. This method is illustrated by two neutron spectrum unfoldings measured with a Bonner Sphere system.

Olivier Besida

2005-06-30T23:59:59.000Z

Note: This page contains sample records for the topic "response spectrum 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

Wideband and Narrowband Spectrum Sensing Methods Using Software Defined Radios.  

E-Print Network [OSTI]

??The ability to accurately sense the surrounding wireless spectrum, without having any prior information about the type of signals present, is an important aspect for… (more)

Stegman, Jason Karl

2014-01-01T23:59:59.000Z

322

Spectrum hole identification and exploitation in cognitive radio networks.  

E-Print Network [OSTI]

??Cognitive radio networks are envisaged as the solution for effective spectrum management for the future communications. In a cognitive radio network, the unlicensed users are… (more)

Vamsi Krishna Tumuluru.

2011-01-01T23:59:59.000Z

323

Priority Queuing Based Spectrum sensing Methodology in Cognitive Radio Network.  

E-Print Network [OSTI]

??Radio spectrum is becoming scarce resource due to increase in the usage of wireless communication devices. However studies have revealed that most of the allotted… (more)

[email protected; /* */, Sajid

2011-01-01T23:59:59.000Z

324

Spectrum of the volume integral operator of electromagnetic scattering  

E-Print Network [OSTI]

Spectrum of the volume integral operator of the three-dimensional electromagnetic scattering is analyzed. The operator has both continuous essential spectrum, which dominates at lower frequencies, and discrete eigenvalues, which spread out at higher ones. The explicit expression of the operator's symbol provides exact outline of the essential spectrum for any inhomogeneous anisotropic scatterer with Holder continuous constitutive parameters. Geometrical bounds on the location of discrete eigenvalues are derived for various physical scenarios. Numerical experiments demonstrate good agreement between the predicted spectrum of the operator and the eigenvalues of its discretized version.

Neil V. Budko; Alexander B. Samokhin

2005-05-04T23:59:59.000Z

325

Use Remote Sensing Data (selected visible and infrared spectrums...  

Broader source: Energy.gov (indexed) [DOE]

Use Remote Sensing Data (selected visible and infrared spectrums) to locate high temperature ground anomalies in Colorado. Confirm heat flow potential with on-site surveys to drill...

326

Vibration-rotation spectrum of HCl: A physical chemistry experiment  

Science Journals Connector (OSTI)

Vibration-rotation spectrum of HCl: A physical chemistry experiment ... Utilizing a 0.5 cm−1 resolution teaching grade FTIR spectrometer, 15 vibrational ... ...

Fred E. Stafford; C. W. Holt; G. L. Paulson

1963-01-01T23:59:59.000Z

327

ARM - Publications: Science Team Meeting Documents: Solar spectrum...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Solar spectrum: Uncertainties between current models and implications for atmospheric radiation modeling and remote sensing Trishchenko, Alexander Canada Centre for Remote Sensing...

328

Response Elements  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

The Guide provides acceptable methods for meeting the requirement of DOE O 151.1C for response elements that respond or contribute to response as needed in an emergency. Cancels DOE G 151.1-1, Volume 3-1, DOE G 151.1-1, Volume 3-2, DOE G 151.1-1, Volume 3-3, DOE G 151.1-1, Volume 3-4, DOE G 151.1-1, Volume 4-1, DOE G 151.1-1, Volume 4-2, DOE G 151.1-1, Volume 4-3, DOE G 151.1-1, Volume 4-4, DOE G 151.1-1, Volume 4-5, and DOE G 151.1-1, Volume 4-6.

2007-07-11T23:59:59.000Z

329

THE SUBMILLIMETER POLARIZATION SPECTRUM OF M17  

SciTech Connect (OSTI)

We present 450 {mu}m polarimetric observations of the M17 molecular cloud obtained with the SHARP polarimeter at the Caltech Submillimeter Observatory. Across the observed region, the magnetic field orientation is consistent with previous submillimeter and far-infrared polarization measurements. Our observations are centered on a region of the molecular cloud that has been compressed by stellar winds from a cluster of OB stars. We have compared these new data with previous 350 {mu}m polarimetry and find an anti-correlation between the 450 and 350 {mu}m polarization magnitude ratio and the ratio of 21 cm to 450 {mu}m intensity. The polarization ratio is lower near the east end of the studied region where the cloud is exposed to stellar winds and radiation. At the west end of the region, the polarization ratio is higher. We interpret the varying polarization spectrum as evidence supporting the radiative alignment torque model for grain alignment, implying higher alignment efficiency in the region that is exposed to a higher anisotropic radiation field.

Zeng Lingzhen; Jimenez-Serra, Izaskun [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Bennett, Charles L. [Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218 (United States); Chapman, Nicholas L.; Novak, Giles [Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) and Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 (United States); Chuss, David T. [Observational Cosmology Laboratory, NASA Goddard Space Flight Center, Code 665, Greenbelt, MD 20771 (United States); Vaillancourt, John E., E-mail: lingzhen@cfa.harvard.edu [SOFIA Science Center, Universities Space Research Association, NASA Ames Research Center, MS 232-11, Moffett Field, CA 94035 (United States)

2013-08-10T23:59:59.000Z

330

Apparatus for synthesis of a solar spectrum  

DOE Patents [OSTI]

A xenon arc lamp and a tungsten filament lamp provide light beams that together contain all the wavelengths required to accurately simulate a solar spectrum. Suitable filter apparatus selectively direct visible and ultraviolet light from the xenon arc lamp into two legs of a trifurcated randomized fiber optic cable. Infrared light selectively filtered from the tungsten filament lamp is directed into the third leg of the fiber optic cable. The individual optic fibers from the three legs are brought together in a random fashion into a single output leg. The output beam emanating from the output leg of the trifurcated randomized fiber optic cable is extremely uniform and contains wavelengths from each of the individual filtered light beams. This uniform output beam passes through suitable collimation apparatus before striking the surface of the solar cell being tested. Adjustable aperture apparatus located between the lamps and the input legs of the trifurcated fiber optic cable can be selectively adjusted to limit the amount of light entering each leg, thereby providing a means of "fine tuning" or precisely adjusting the spectral content of the output beam. Finally, an adjustable aperture apparatus may also be placed in the output beam to adjust the intensity of the output beam without changing the spectral content and distribution of the output beam.

Sopori, Bhushan L. (Denver, CO)

1993-01-01T23:59:59.000Z

331

Coupled multiphase flow and closure analysis of repository response to waste-generated gas at the Waste Isolation Pilot Plant (WIPP)  

SciTech Connect (OSTI)

A long-term assessment of the Waste Isolation Pilot Plant (WIPP) repository performance must consider the impact of gas generation resulting from the corrosion and microbial degradation of the emplaced waste. A multiphase fluid flow code, TOUGH2/EOS8, was adapted to model the processes of gas generation, disposal room creep closure, and multiphase (brine and gas) fluid flow, as well as the coupling between the three processes. System response to gas generation was simulated with a single, isolated disposal room surrounded by homogeneous halite containing two anhydrite interbeds, one above and one below the room. The interbeds were assumed to have flow connections to the room through high-permeability, excavation-induced fractures. System behavior was evaluated by tracking four performance measures: (1) peak room pressure; (2) maximum brine volume in the room; (3) total mass of gas expelled from the room; and (4) the maximum gas migration distance in an interbed. Baseline simulations used current best estimates of system parameters, selected through an evaluation of available data, to predict system response to gas generation under best-estimate conditions. Sensitivity simulations quantified the effects of parameter uncertainty by evaluating the change in the performance measures in response to parameter variations. In the sensitivity simulations, a single parameter value was varied to its minimum and maximum values, representative of the extreme expected values, with all other parameters held at best-estimate values. Sensitivity simulations identified the following parameters as important to gas expulsion and migration away from a disposal room: interbed porosity; interbed permeability; gas-generation potential; halite permeability; and interbed threshold pressure. Simulations also showed that the inclusion of interbed fracturing and a disturbed rock zone had a significant impact on system performance.

Freeze, G.A.; Larson, K.W. [INTERA Inc., Austin, TX (United States); Davies, P.B. [Sandia National Laboratories, Albuquerque, NM (United States)

1995-10-01T23:59:59.000Z

332

A new RNASeq-based reference transcriptome for sugar beet and its application in transcriptome-scale analysis of vernalization and gibberellin responses  

E-Print Network [OSTI]

× 10-172 ATAMY3, AMY3 | alpha-amylase-like 3 | chr1:26288518-26293003 REVERSE LENGTH = 887 98654 AT1G16070.2 2 × 10-106 AtTLP8, TLP8 | tubby like protein 8 | chr1:5511899-5513779 REVERSE LENGTH = 398 32761 AT1G56580.1 8 × 10-41 SVB | Protein of unknown... transport; response to abscisic acid stimulus; endomembrane system; lipid binding; AT5G63090 LOB organ boundary specification between lateral organs and the meristem; chloroplast; na AT1G69830 na starch catabolic process; chloroplast; alpha-amylase activity...

Mutasa-Gottgens, Effie S; Joshi, Anagha; Holmes, Helen F; Hedden, Peter; Gottgens, Berthold

2012-03-19T23:59:59.000Z

333

On the energy loss of muons and their momentum spectrum  

Science Journals Connector (OSTI)

Our results on the momentum spectrum under 7.2 kg cm-2 of rock have been extended to lower momenta in order to test the expected rate of momentum loss in the rock. The low-momentum spectrum is quite sensitive to ...

M. J. Campbell; H. S. Murdoch; K. W. Ogilvie; H. D. Rathgeber

1963-01-01T23:59:59.000Z

334

: Correlation-Based Cooperative Spectrum Sensing in Cognitive Radio Networks  

E-Print Network [OSTI]

(CORN)2 : Correlation-Based Cooperative Spectrum Sensing in Cognitive Radio Networks Dongyue Xue is referred to as cognitive radio networks (CRNs) [2]. Based on the ambient spectrum information, cognitive for cognitive radio networks to minimize energy consumption. A sensing quality metric is defined as a measure

Paris-Sud XI, Université de

335

Denial-of-Service Attacks on Dynamic Spectrum Access Networks  

E-Print Network [OSTI]

radios was opportunistic utilization of licensed spec- trum bands. Traditionally, the spectrum has been Abstract-- Cognitive radio technologies have emerged as a platform to solve the problem of spectrum scarcity for wire- less applications since cognitive radios have the potential to utilize the idle licensed

Subbalakshmi , K.P. "Suba"

336

Cognitive UWB-OFDM: Combining Ultrawideband with Opportunistic Spectrum Usage  

E-Print Network [OSTI]

wireless world, the number of radio systems increases every day, and efficient spectrum usage becomes problem, cognitive radio proposes an opportunistic spectrum usage approach [3], in which frequency bands that are not being used by their primary (licensed) users are utilized by cognitive radios. Both UWB and cognitive

Arslan, Hüseyin

337

Supporting Dynamic Spectrum Access in Heterogeneous LTE+ Networks  

SciTech Connect (OSTI)

As early as 2014, mobile network operators’ spectral capac- ity is expected to be overwhelmed by the demand brought on by new devices and applications. With Long Term Evo- lution Advanced (LTE+) networks likely as the future one world 4G standard, network operators may need to deploy a Dynamic Spectrum Access (DSA) overlay in Heterogeneous Networks (HetNets) to extend coverage, increase spectrum efficiency, and increase the capacity of these networks. In this paper, we propose three new management frameworks for DSA in an LTE+ HetNet: Spectrum Accountability Client, Cell Spectrum Management, and Domain Spectrum Man- agement. For these spectrum management frameworks, we define protocol interfaces and operational signaling scenar- ios to support cooperative sensing, spectrum lease manage- ment, and alarm scenarios for rule adjustment. We also quan- tify, through integer programs, the benefits of using DSA in an LTE+ HetNet, that can opportunistically reuse vacant TV and GSM spectrum. Using integer programs, we consider a topology using Geographic Information System data from the Blacksburg, VA metro area to assess the realistic benefits of DSA in an LTE+ HetNet.

Luiz A. DaSilva; Ryan E. Irwin; Mike Benonis

2012-08-01T23:59:59.000Z

338

Luo and Zhang: DSM and Optimization 1 Dynamic Spectrum Management  

E-Print Network [OSTI]

Luo and Zhang: DSM and Optimization 1 Dynamic Spectrum Management: Complexity, Duality and Zhang: DSM and Optimization 2 Dynamic Spectrum Management (DSM) Multiuser communication system: · K interferences. Shuzhong Zhang, The Chinese University of Hong Kong #12;Luo and Zhang: DSM and Optimization 3

Zhang, Shuzhong

339

Fishing destabilizes the biomass flow in the marine size spectrum  

Science Journals Connector (OSTI)

...processes underlying the biomass size spectrum, the distribution of biomass across body size classes...species. When the energy transfer is governed...Dickie 2001 The biomass spectrum. A predator-prey...and T. Platt 1978 Energy flux in the pelagic...

2012-01-01T23:59:59.000Z

340

Absolutely continuous spectrum and spectral transition for some continuous random  

E-Print Network [OSTI]

both of which ex- hibit a.c. spectrum. In the former case we also know the existence of dense pure are 'sparse' as we later exhibit in the example 3.1. Exhibiting a.c. spectrum for stationary random potentials is a hard and interesting problem and this was shown on the Bethe lattice by Klein [16] first

Maddaly, Krishna

Note: This page contains sample records for the topic "response spectrum 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 Impact of Frequency-Agility on Dynamic Spectrum Sharing  

E-Print Network [OSTI]

The Impact of Frequency-Agility on Dynamic Spectrum Sharing Lili Cao, Lei Yang and Haitao Zheng}@cs.ucsb.edu Abstract-- Designed to adapt spectrum usage on-the-fly, frequency-agile radios can drastically improve complexity. This motivates us to understand when and why having higher degree of frequency-agility helps

Almeroth, Kevin C.

342

AIAA-2001-0025 SPECTRUM FATIGUE LIFETIME AND RESIDUAL STRENGTH  

E-Print Network [OSTI]

fit of the two. Direct lifetime under a variety of loads spectra for wind tests of residual strength for a modified standard wind bone coupons were manufactured, tested and favorably turbine spectrum. When a single and residual strength. Over 900 tests spectrum loading and fatigue lifetimes of a typical wind have been run

343

A Simple Sequential Spectrum Sensing Scheme for Cognitive Radio  

E-Print Network [OSTI]

Cognitive radio that supports a secondary and opportunistic access to licensed spectrum shows great potential to dramatically improve spectrum utilization. Spectrum sensing performed by secondary users to detect unoccupied spectrum bands, is a key enabling technique for cognitive radio. This paper proposes a truncated sequential spectrum sensing scheme, namely the sequential shifted chi-square test (SSCT). The SSCT has a simple test statistic and does not rely on any deterministic knowledge about primary signals. As figures of merit, the exact false-alarm probability is derived, and the miss-detection probability as well as the average sample number (ASN) are evaluated by using a numerical integration algorithm. Corroborating numerical examples show that, in comparison with fixed-sample size detection schemes such as energy detection, the SSCT delivers considerable reduction on the ASN while maintaining a comparable detection performance.

Xin, Yan

2009-01-01T23:59:59.000Z

344

Fast Spectrum Molten Salt Reactor Options  

SciTech Connect (OSTI)

During 2010, fast-spectrum molten-salt reactors (FS-MSRs) were selected as a transformational reactor concept for light-water reactor (LWR)-derived heavy actinide disposition by the Department of Energy-Nuclear Energy Advanced Reactor Concepts (ARC) program and were the subject of a preliminary scoping investigation. Much of the reactor description information presented in this report derives from the preliminary studies performed for the ARC project. This report, however, has a somewhat broader scope-providing a conceptual overview of the characteristics and design options for FS-MSRs. It does not present in-depth evaluation of any FS-MSR particular characteristic, but instead provides an overview of all of the major reactor system technologies and characteristics, including the technology developments since the end of major molten salt reactor (MSR) development efforts in the 1970s. This report first presents a historical overview of the FS-MSR technology and describes the innovative characteristics of an FS-MSR. Next, it provides an overview of possible reactor configurations. The following design features/options and performance considerations are described including: (1) reactor salt options-both chloride and fluoride salts; (2) the impact of changing the carrier salt and actinide concentration on conversion ratio; (3) the conversion ratio; (4) an overview of the fuel salt chemical processing; (5) potential power cycles and hydrogen production options; and (6) overview of the performance characteristics of FS-MSRs, including general comparative metrics with LWRs. The conceptual-level evaluation includes resource sustainability, proliferation resistance, economics, and safety. The report concludes with a description of the work necessary to begin more detailed evaluation of FS-MSRs as a realistic reactor and fuel cycle option.

Gehin, Jess C [ORNL; Holcomb, David Eugene [ORNL; Flanagan, George F [ORNL; Patton, Bruce W [ORNL; Howard, Rob L [ORNL; Harrison, Thomas J [ORNL

2011-07-01T23:59:59.000Z

345

Demand Response and Open Automated Demand Response  

E-Print Network [OSTI]

LBNL-3047E Demand Response and Open Automated Demand Response Opportunities for Data Centers G described in this report was coordinated by the Demand Response Research Center and funded by the California. Demand Response and Open Automated Demand Response Opportunities for Data Centers. California Energy

346

Crosstalk Compensation for a Rapid, Higher Resolution Impedance Spectrum Measurement  

SciTech Connect (OSTI)

Batteries and other energy storage devices are playing larger roles in various industries (e.g., military, automotive, electric utilities, etc.) as the U.S. seeks to reduce its dependence on foreign energy resources. As such, there exists a significant need for accurate, robust state-of-health assessment techniques. Present techniques tend to focus on simple, passive monitoring of voltage and current at a given ambient temperature. However, this approach has the disadvantage of ignoring key elements of health, that is, changes in resistance growth and power fade. Impedance spectroscopy is considered a useful laboratory tool in gauging changes in the resistance and power performance, but it has not been widely considered as an onboard diagnostic tool due to the length of time required to complete the measurement. Cross-Talk Compensation (CTC) is a novel approach that enables rapid, high resolution impedance spectra measurements using a hardware platform that could be designed as an embedded system. This input signal consists of a sum-of-sines excitation current that has a known frequency spread and a duration of one period of the lowest frequency. The voltage response is then captured at a sufficiently fast sample rate. Previously developed rapid impedance spectrum measurement techniques either required a longer excitation signal or a sum-of-sines signal that was separated by harmonic frequencies to reduce or eliminate, respectively, the cross-talk interference in the calculated results. The distinct advantage of CTC, however, is that non-harmonic frequencies can now be included within the excitation signal while still keeping the signal duration at one period of the lowest frequency. Since the frequency spread of the input signal is known, the crosstalk interference between sinusoidal signals within the sum-of-sines at a given frequency of interest can be pre-determined and assigned to an error matrix. Consequently, the real and imaginary components of the impedance at each frequency of interest can be calculated using simple linear algebra based on the error matrix and measured response from the energy storage device given the excitation signal. Analytical validation of CTC over a frequency range between 2000 and 0.1 Hz (i.e., a ten-second input signal duration) was performed using a standardized battery lumped parameter model. The results indicated that the CTC was able to successfully resolve more than 45 frequencies within a sum-of-sines excitation signal, whereas previous techniques could only resolve up to 15 frequencies. A simplified derivation of the CTC technique and its corresponding analytical validation studies using the lumped-parameter model will be presented.

Jon P. Christophersen; John L. Morrison; David M. Rose; William H. Morrison; Chester G. Motloch

2012-03-01T23:59:59.000Z

347

Spectrum and structure of complexes of HCl with s-tetrazine. [s-tetrazine  

SciTech Connect (OSTI)

Complexes of s-tetrazine with HCl have been prepared in a supersonic free-jet expansion, and their spectra have been observed by laser-induced fluorescence. Rotational structure has been observed in the electronic spectrum, and analysis of this structure has allowed the determination of the geometries of the complexes. The one-to-one complex tetrazine-HCl has a planar structure with the hydrogen of the HCl hydrogen bonded to the lone pair of the tetrazine nitrogen atom. A vibrational feature in the fluorescence excitation spectrum displaced 26 cm/sup -1/ from the origin transition has been assigned as an overtone of a nontotally symmetric out-of-plane bend of the HCl. In the complex tetrazine-(HCl)/sub 2/, the second HCl molecule bonds to the HCl, not directly to the tetrazine ring.

Haynam, C.A.; Morter, C.; Young, L.; Levy, D.H.

1987-05-07T23:59:59.000Z

348

CONSULTATION RESPONSE Wellcome Trust response to Workforce  

E-Print Network [OSTI]

account of in workforce planning. The importance of integrating academic training with clinical trainingCONSULTATION RESPONSE Wellcome Trust response to Workforce of the Healthcare Science Workforce Modernising Scientific Careers: The Next Steps Response by the Wellcome Trust

Rambaut, Andrew

349

Multiphonon Optical Spectrum of NaF  

Science Journals Connector (OSTI)

The high-frequency exponential wing of the reststrahlen band of NaF is decomposed into a number of N-phonon absorption spectra (N=2,3,4,5) by means of a temperature analysis. Overall agreement of the individual spectra with recent theoretical predictions is good, except for a fairly pronounced structure which indicates particularly strong contributions from certain frequencies of the TO and LO phonon branches.

Thomas F. McNelly and Dieter W. Pohl

1974-06-10T23:59:59.000Z

350

The Broadband Spectrum of Galaxy Clusters  

E-Print Network [OSTI]

We examine whether nonthermal protons energized during a cluster merger are simultaneously responsible for the Coma cluster's diffuse radio flux (via secondary decay) and the departure of its intra-cluster medium (ICM) from a thermal profile via Coulomb collisions between the quasithermal electrons and the hadrons. Rather than approximating the influence of nonthermal proton/thermal electron collisions as extremely rare events which cause an injection of nonthermal, power-law electrons (the `knock-on' approximation), we self-consistently solve (to our knowledge, for the first time) the covariant kinetic equations for the two populations. The electron population resulting from these collisions is out of equilibrium, yet not a power law, and importantly displays a higher bremsstrahlung radiative efficiency than a pure power law. Observations with GLAST will test this model directly.

Brandon Wolfe; Fulvio Melia

2007-12-02T23:59:59.000Z

351

Spectrum of Light in a Quantum Fluctuating Periodic Structure  

Science Journals Connector (OSTI)

We address the general problem of the excitation spectrum for light coupled to scatterers having quantum fluctuating positions around the sites of a periodic lattice. In addition to providing an imaginary part to the spectrum, we show that these quantum fluctuations affect the real part of the spectrum, in a way that we determine analytically. Our predictions may be observed with ultracold atoms in an optical lattice, on a J=0?J?=1 narrow atomic transition. As a side result, we resolve a controversy for the occurrence of a spectral gap in a fcc lattice.

Mauro Antezza and Yvan Castin

2009-09-18T23:59:59.000Z

352

Commercial & Industrial Demand Response  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Resources News & Events Expand News & Events Skip navigation links Smart Grid Demand Response Agricultural Residential Demand Response Commercial & Industrial Demand Response...

353

On the Performance of Dimension Estimation-based Spectrum Sensing for Cognitive Radio  

E-Print Network [OSTI]

On the Performance of Dimension Estimation-based Spectrum Sensing for Cognitive Radio Bassem Zayen-day spectrum allocation and spectrum use suggests that radio spectrum shortage could be overcome by allowing immediate local spectrum availability. A new class of radios that is able to reliably sense the spectral

Gesbert, David

354

A Performance Study of Kullback-Leibler Distance-based Spectrum Sensing Algorithm  

E-Print Network [OSTI]

-day spectrum allocation and spectrum use suggests that radio spectrum shortage could be overcome by allowing immediate local spectrum availability. A new class of radios that is able to reliably sense the spectral1 A Performance Study of Kullback-Leibler Distance-based Spectrum Sensing Algorithm Bassem Zayen

Gesbert, David

355

Joint Transport, Routing and Spectrum Sharing Optimization for Wireless Networks with  

E-Print Network [OSTI]

on the spectrum agility of modern radios which can configure both the central frequency and spectrum width and cognitive radios) enable more flexible spectrum access through spectrum sensing and dy- namic that the amount/width of spectrum band of radio channels can also be configured dynamically. For examples, in Wi

Ha, Dong S.

356

A Game Theoretic Approach for Medium Access of Open Spectrum in Cognitive Radios  

E-Print Network [OSTI]

A Game Theoretic Approach for Medium Access of Open Spectrum in Cognitive Radios Madhusudhan R broadcast [2]. The U.S. DARPA Next Generation Com- open spectrum for spectrum agile radios that use spectrum radios. Spectrum funding Program (FP6) of the European Union are working agile radios operate in parts

Chronopoulos, Anthony T.

357

IEEE TRANSACTIONS ON SYSTEMS, MAN, AND CYBERNETICS PART B 1 Spectrum Sharing in Cognitive Radio Networks  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON SYSTEMS, MAN, AND CYBERNETICS ­ PART B 1 Spectrum Sharing in Cognitive Radio of radio frequency spectrum. In this paper, we consider the problem of spectrum sharing among primary (or Terms--Cognitive radio, spectrum sensing, spectrum sharing, game theory, Nash equilibrium. I

Wang, Xinbing

358

Power Control in Spectrum Overlay Networks: How to Cross a Multi-Lane Highway  

E-Print Network [OSTI]

--Cognitive radio, opportunistic spectrum access, spec- trum overlay, power control, spectrum opportunity detectionPower Control in Spectrum Overlay Networks: How to Cross a Multi-Lane Highway Wei Ren, Qing Zhao in spectrum overlay networks (also referred to as opportunistic spectrum access) where secondary users

Islam, M. Saif

359

DECENTRALIZED COGNITIVE MAC FOR DYNAMIC SPECTRUM ACCESS Qing Zhao, Lang Tong, and Ananthram Swami  

E-Print Network [OSTI]

- prove spectrum efficiency through time- and space-dependent spectrum sharing among coexisting radio and region, a portion of the spectrum to a radio access network for its exclusive use. As such, white space to exploit the instantaneous spectrum availability by opening licensed spectrum to secondary users. The idea

Islam, M. Saif

360

Distributed Compressive Wide-Band Spectrum Ying Wang , Ashish Pandharipande , Yvan Lamelas Polo and Geert Leus  

E-Print Network [OSTI]

-band spectrum sensing, Cognitive radio, Spectrum estimation. I. INTRODUCTION Efficient utilization of radio and services and the dearth of available spectrum for licensed allocation [13]. Recent spectrum measurements have shown that large portions of licensed spectrum, notably in the VHF-UHF bands licensed

Leus, Geert

Note: This page contains sample records for the topic "response spectrum 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

1203caref1 http://www.spectrum.ieee.org/spectrum/dec03/departments/1203caref... 1 of 1 12/7/03 1:47 PM  

E-Print Network [OSTI]

1203caref1 http://www.spectrum.ieee.org/spectrum/dec03/departments/1203caref... 1 of 1 12/7/03 1 #12;Resources: Careers http://www.spectrum.ieee.org/spectrum/dec03/departments/1203care... 2 of 4 12, Stetten designed a radio telemetric egg that could sense the range of temperatures experienced under

Stetten, George

362

The Redshift Distribution of Flat-Spectrum Radio Sources  

E-Print Network [OSTI]

The redshift distribution of flat-spectrum radio sources with 5 GHz flux densities S>5 mJy is a key component in using current radio lens surveys to probe the cosmological model. We have constructed the first flat-spectrum radio sample in the flux density range 3-20 mJy. Our new sample has 33 sources; we have determined the redshifts of 14 of these (42% complete). The low mean redshift, ~0.75, of our faintest sample needs to be confirmed by further observations to improve the sample completeness. We also increased the redshift completeness of several surveys of brighter flat-spectrum sources. While the mean redshift, ~1.1 of flat-spectrum samples fainter than 1 Jy is nearly constant, the fraction of the sources identifiable as quasars steadily drops from ~80% to ~10% as the flux density of the sources decreases.

J. A. Munoz; E. E. Falco; C. S. Kochanek; J. Lehar; E. Mediavilla

2003-05-20T23:59:59.000Z

363

Low frequency radio spectrum and spectral turnover of LS 5039  

E-Print Network [OSTI]

LS 5039, a possible black hole x-ray binary, was recently observed with Giant Meterwave Radio Telescope. The observed spectrum presented here shows that the spectrum is inverted at the low frequency. When combined with the archival data with orbital phase similar to the present observations, it shows a clear indication of a spectral turnover. The combined data are fitted with a broken power-law and the break frequency signifies a possible spectral turnover of the spectrum around 964 MHz. Truly simultaneous observations in radio wavelength covering a wide range of frequencies are required to fix the spectrum and the spectral turn over which will play a crucial role in developing a deeper understanding of the radio emitting jet in LS 5039.

Sagar Godambe; Subir Bhattacharyya; Nilay Bhatt; Manojendu Choudhury

2008-07-15T23:59:59.000Z

364

Building highly efficient LEDs in the yellow-green spectrum  

SciTech Connect (OSTI)

Argonne and Purdue researchers are peering deep into the atomic structure and composition of LED lights in order to build highly efficient LEDs in the yellow-green spectrum.

None

2012-01-01T23:59:59.000Z

365

Discharge convective instability as modifier of nonlinear hydrodynamic spectrum  

E-Print Network [OSTI]

Discharge source is considered as modifier of flow hydrodynamic spectrum. Characteristic frequency of nonlinear spectrum and spectrum power were determined under conditions of arc sliding discharge in supersonic flow. Two stages of discharge were defined: sliding stage and still stage. It was found that stage transition occurs due to convective instability of discharge. Fraction of sliding stage in overall discharge duration is determined by averaged current that is general stable discharge parameter. This phenomenon gives opportunity to control power of pressure fluctuations spectrum. Theoretical insight of field and hydrodynamic factors influencing on pulsations frequency was achieved. Hydrodynamic resistance of discharge region and holding cathode electric field turned out to be basic factors of frequency modification. Corresponding experimental verification was taken. Basic frequency law was determined for several discharge regimes.

Sergey Kamenshchikov

2012-04-26T23:59:59.000Z

366

Energy levels of the second spectrum of curium, Cm ii  

Science Journals Connector (OSTI)

The curium emission spectrum from electrodeless lamps has been observed from 2400 to 26 500 Å. About 30% of the 14,250 observed lines have been assigned by experimental methods as Cm...

Worden, Earl F; Conway, John G; Blaise, Jean

1986-01-01T23:59:59.000Z

367

The Spectrum of Fluorine (F1). Part II  

Science Journals Connector (OSTI)

2 January 1928 research-article The Spectrum of Fluorine (F1). Part II Herbert Dingle The Royal Society is collaborating with JSTOR to digitize, preserve, and extend access to Proceedings...

1928-01-01T23:59:59.000Z

368

An evaluation of the fast-mixed spectrum reactor  

E-Print Network [OSTI]

An independent evaluation of the neutronic characteristics of a gas-cooled fast-mixed spectrum reactor (FMSR) core design has been performed. A benchmark core configuration for an early FMSR design was provided by Brookhaven ...

Loh, Wee Tee

1980-01-01T23:59:59.000Z

369

Underground muon energy spectrum and its relevance for muon astronomy  

Science Journals Connector (OSTI)

A striking result from the NUSEX (1) and SOUDAN (2...) experiments is the discovery of a high flux of muons from the direction of Cygnus X-3 ... source. The differential energy spectrum of these muons is much fla...

A. Castellina; B. D’Ettorre Piazzoli; G. Mannocchi…

1985-11-16T23:59:59.000Z

370

Seeing the Invisible Axion in the Sparticle Spectrum  

E-Print Network [OSTI]

I describe how under favourable circumstances the invisible axion may manifest its existence at the LHC through the sparticle spectrum; in particular through a gluino \\sim \\ln (M_P/m_{3/2}) times heavier than other gauginos.

Joseph P. Conlon

2006-07-12T23:59:59.000Z

371

Optimal Channel Probing and Transmission Scheduling for Opportunistic Spectrum Access  

E-Print Network [OSTI]

In this study, we consider optimal opportunistic spectrum access (OSA) policies for a transmitter in a multichannel wireless system, where a channel can be in one of multiple states. In such systems, the transmitter typically ...

Chang, Nicholas B.

372

MEASURING THE JET POWER OF FLAT-SPECTRUM RADIO QUASARS  

SciTech Connect (OSTI)

We use frequency-dependent position shifts of flat-spectrum radio cores to estimate the kinetic power of active galactic nucleus (AGN) jets. We find a correlation between the derived jet powers and AGN narrow-line luminosity, consistent with the well-known relation for radio galaxies and steep spectrum quasars. This technique can be applied to intrinsically weak jets even at high redshift.

Shabala, S. S.; Santoso, J. S. [School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, TAS 7001 (Australia); Godfrey, L. E. H. [International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, Western Australia 6845 (Australia)

2012-09-10T23:59:59.000Z

373

Terahertz bandwidth integrated radio frequency spectrum analyzer via nonlinear optics  

E-Print Network [OSTI]

We report an integrated all-optical radio frequency spectrum analyzer based on a ~ 4cm long doped silica glass waveguide, with a bandwidth greater than 2.5 THz. We use this device to characterize the intensity power spectrum of ultrahigh repetition rate mode-locked lasers at repetition rates up to 400 GHz, and observe dynamic noise related behavior not observable with other techniques.

Ferrera, Marcello; Pasquazi, Alessia; Peccianti, Marco; Clerici, Matteo; Caspani, Lucia; Chu, Sai T; Little, Brent E; Morandotti, Roberto; Moss, David J

2014-01-01T23:59:59.000Z

374

Mechanism for a bounded and discrete mass spectrum of fermions  

E-Print Network [OSTI]

A mechanism for determining fermion masses in four spacetime dimensions is presented, which uses a scalar-field domain wall extending in a fifth spacelike dimension and a special choice of Yukawa coupling constants. A bounded and discrete fermion mass spectrum is obtained, which depends on a combination of the Yukawa coupling constants and the parameters of the scalar potential. A similar mechanism for a finite mass spectrum may apply to $(1+1)$--dimensional fermions relevant to condensed matter physics.

Klinkhamer, F R

2014-01-01T23:59:59.000Z

375

The Spectrum of SnF  

Science Journals Connector (OSTI)

Measurements of the absorption bands of SnF are reported for the first time. Analysis of the frequencies of the band heads shows the presence of four doublet systems, all due to transitions from a doublet normal state X, of separation 2317.3 cm-1. The various states are as follows: State??exe?eProbable typeX0.0582.92.69?2 2317.3587.62.65 A34,108.4676.72.65?2B40,834594-?2C44,161.6688.24.65?2 45,498.9688.24.65 D46,326598-?2 46,427607- E?41,000---F?53,000--- The transitions E?X and F?X give continua. The second component of B?X is probably masked by E?X. Resolution of the Sn isotope effect is observed for the first time. A carbon tube furnace for studying absorption spectra is described.

F. A. Jenkins and George D. Rochester

1937-12-01T23:59:59.000Z

376

A Wavelet Approach to Wideband Spectrum Sensing for Cognitive Radios Department of Electrical & Computer Engineering  

E-Print Network [OSTI]

A Wavelet Approach to Wideband Spectrum Sensing for Cognitive Radios Zhi Tian Department. The proposed sensing techniques provide an effective radio sensing architecture to identify and locate spectrum static spectrum allocation, fixed radio functions, and limited network coordination between mobile

Tian, Zhi "Gerry"

377

DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum  

E-Print Network [OSTI]

We present measurements of anisotropy in the Cosmic Microwave Background (CMB) from the first season of observations with the Degree Angular Scale Interferometer (DASI). The instrument was deployed at the South Pole in the austral summer 1999--2000, and made observations throughout the following austral winter. We have measured the angular power spectrum of the CMB in the range 100analysis, in particular the use of constraint matrices to project out contaminants such as ground and point source signals, and to test for correlations with diffuse foreground templates. We find no evidence of foregrounds other than point sources in the data, and find a maximum likelihood temperature spectral index beta = -0.1 +/- 0.2 (1 sigma), consistent with CMB. We detect a first peak in the power spectrum at l approx 200, in agreement with previous experiments. In addition, we detect a peak in the power spectrum at l approx 550 and power of similar magnitude at l approx 800 which are consistent with the second and third harmonic peaks predicted by adiabatic inflationary cosmological models.

N. W. Halverson; E. M. Leitch; C. Pryke; J. Kovac; J. E. Carlstrom; W. L. Holzapfel; M. Dragovan; J. K. Cartwright; B. S. Mason; S. Padin; T. J. Pearson; M. C. Shepherd; A. C. S. Readhead

2001-04-30T23:59:59.000Z

378

Effect of space charge on the energy spectrum of a multispecies ion beam  

SciTech Connect (OSTI)

The parameters of a multispecies metal ion beam extracted with the help of a set of grids from a plasma jet of a pulsed vacuum arc are studied experimentally. It is shown that the beam contains ions with energies that are both significantly lower and higher than the expected energy E{sub Z} = Z-bar eU{sub acc}, where Z-bar is the average ion charge number and U{sub acc} is the extracting voltage. As a result, the mean ion energy is lower than E{sub Z} and the ion energy spectrum is substantially wider than that in the plasma jet. It is found that this effect weakens with decreasing discharge current amplitude and that the shape of the spectrum depends on the accelerating voltage. Probe measurements show that, at accelerating voltages higher than 1 kV, a positive space charge forms in the drift gap, due to which the electric potential in the drift gap increases to a few hundred electronvolts. Analysis of experimental data indicates that the observed features of the ion spectrum can be attributed to the effect of the unsteady electric field of the space charge of the ion beam transported through the drift gap.

Paperny, V. L.; Chernykh, A. A. [Irkutsk State University (Russian Federation); Shklyaev, V. A. [Russian Academy of Sciences, Institute of High-Current Electronics, Siberian Branch (Russian Federation)

2009-02-15T23:59:59.000Z

379

PyRAT (python radiography analysis tool): overview  

SciTech Connect (OSTI)

PyRAT was developed as a quantitative tool for robustly characterizing objects from radiographs to solve problems such as the hybrid nonlinear inverse problem. The optimization software library that was used is the nonsmooth optimization by MADS algorithm (NOMAD). Some of PyRAT's features are: (1) hybrid nonlinear inverse problem with calculated x-ray spectrum and detector response; (2) optimization based inversion approach with goal of identifying unknown object configurations - MVO problem; (3) using functionalities of Python libraries for radiographic image processing and analysis; (4) using the Tikhonov regularization method of linear inverse problem to recover partial information of object configurations; (5) using a priori knowledge of problem solutions to define feasible region and discrete neighbor for the MVO problem - initial data analysis + material library {yields} a priori knowledge; and (6) using the NOMAD (C++ version) software in the object.

Armstrong, Jerawan C [Los Alamos National Laboratory; Temple, Brian A [Los Alamos National Laboratory; Buescher, Kevin L [Los Alamos National Laboratory

2011-01-14T23:59:59.000Z

380

E-Print Network 3.0 - autistic spectrum disorders--a Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Practice... in autistic spectrum disorders, Special Children, 3pp. ISSN: 09516875. RR Jordan, KK Guldberg. 2002... . Autistic Spectrum Disorders. Web wise, Special ... Source:...

Note: This page contains sample records for the topic "response spectrum 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

Improving spectrum sensing and multiuser cooperation in wireless cognitive radio networks.  

E-Print Network [OSTI]

??Nowadays wireless spectrum resource is more and more scarce because most wireless spectrum bands have been allocated to licensed users, however measurements show that many… (more)

Song, Chengqi

2010-01-01T23:59:59.000Z

382

Performance of Cognitive Radio Spectrum Access with Intra- and Inter-Handoff.  

E-Print Network [OSTI]

??Opportunistic spectrum access (OSA) is a technology that allows unlicensed users to access spectrum holes and to provide so efficient use of radio resources. Most… (more)

Yao, Yong; Ngoga, Said; Erman, David

2012-01-01T23:59:59.000Z

383

E-Print Network 3.0 - apparatus-mass spectrum resolution Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

RF Emissions: Spectrum Analyzers and Ylva Pihlstrm, UNM Summary: 1 LWA Equipment RF Emissions: Spectrum Analyzers and Laptops Ylva Pihlstrm, UNM 82706 Summary I......

384

A power line impedance spectrum analyzer using real-time digital signal processing  

E-Print Network [OSTI]

. The subscript on each source corresponds to the harmonic generated by that source and all sources were set to an amplitude of O. lmA. The output files obtained from a transient analysis were then transferred to Matlab, and impedance spectrums were generated... Harmonic Number Figure 12 Simulated lmH Load Next the power network was simulated both with and without the attachment of the non-linear load. The voltage across the linear load was measured and plotted in the frequency domain using Matlab. Figure 13...

Margolis, Michael G

2012-06-07T23:59:59.000Z

385

Theoretical rotation-vibration spectrum of thioformaldehyde  

SciTech Connect (OSTI)

We present a variational calculation of the first comprehensive T = 300 K rovibrational line list for thioformaldehyde, H{sub 2}CS. It covers 41?809 rovibrational levels for states up to J{sub max} = 30 with vibrational band origins up to 5000 cm{sup ?1} and provides the energies and line intensities for 547?926 transitions from the ground vibrational state to these levels. It is based on our previously reported accurate ab initio potential energy surface and a newly calculated ab initio dipole moment surface. Minor empirical adjustments are made to the ab initio equilibrium geometry to reduce systematic errors in the predicted intra-band rotational energy levels. The rovibrational energy levels and transition intensities are computed variationally by using the methods implemented in the computer program TROVE. Transition wavelengths and intensities are found to be in excellent agreement with the available experimental data. The present calculations correctly reproduce the observed resonance effects, such as intensity borrowing, thus reflecting the high accuracy of the underlying ab initio surfaces. We report a detailed analysis of several vibrational bands, especially those complicated by strong Coriolis coupling, to facilitate future laboratory assignments.

Yachmenev, Andrey [Department of Physics and Astronomy, University College London, London, WC1E 6BT (United Kingdom)] [Department of Physics and Astronomy, University College London, London, WC1E 6BT (United Kingdom); Polyak, Iakov; Thiel, Walter [Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D–45470 Mülheim an der Ruhr (Germany)] [Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D–45470 Mülheim an der Ruhr (Germany)

2013-11-28T23:59:59.000Z

386

E-Print Network 3.0 - anomalous genotoxic responses Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

response. Generally, toxicity testing agreed with expectations based on chemical analysis... the genotoxic response, among which PAHs and dioxins are prominent. The three...

387

The Challenge of an Automatic Mössbauer Analysis  

Science Journals Connector (OSTI)

The present paper reports on our efforts to obtain an intelligent and automatic Mössbauer analysis. For this propose, a program was implemented capable to analyse and fit a Mössbauer spectrum, identify the sub...

Paulo A. de Souza Jr.; Vijayendra K. Garg

1999-01-01T23:59:59.000Z

388

FlexibleSUSY -- A spectrum generator generator for supersymmetric models  

E-Print Network [OSTI]

We introduce FlexibleSUSY, a Mathematica and C++ package, which generates a fast, precise C++ spectrum generator for any SUSY model specified by the user. The generated code is designed with both speed and modularity in mind, making it easy to adapt and extend with new features. The model is specified by supplying the superpotential, gauge structure and particle content in a SARAH model file; specific boundary conditions e.g. at the GUT, weak or intermediate scales are defined in a separate FlexibleSUSY model file. From these model files, FlexibleSUSY generates C++ code for self-energies, tadpole corrections, renormalization group equations (RGEs) and electroweak symmetry breaking (EWSB) conditions and combines them with numerical routines for solving the RGEs and EWSB conditions simultaneously. The resulting spectrum generator is then able to solve for the spectrum of the model, including loop-corrected pole masses, consistent with user specified boundary conditions. The modular structure of the generated co...

Athron, Peter; Stöckinger, Dominik; Voigt, Alexander

2014-01-01T23:59:59.000Z

389

Electronic structure and UV spectrum of hexachloroplatinate dianions in vacuo  

SciTech Connect (OSTI)

We present a joint experimental and theoretical study of the electronic spectrum of hexachloroplatinate dianion. We have measured electronic photodissociation and photodetachment spectra of mass-selected PtCl{sub 6}{sup 2?} ions in vacuo and compare these with calculated band positions from time-dependent density functional theory and from relativistic calculations. Excitation of an electronic transition of the dianion leads to resonant enhancement of the photodetachment cross section superimposed on direct detachment. Photoexcitation results in loss of Cl{sup ?} and Cl{sup 0}, depending on photon energy. The photofragmentation spectrum for formation of the PtCl{sub 4}{sup ?} fragment ion mirrors the UV/vis absorption spectrum of PtCl{sub 6}{sup 2?} in solution with a small solvatochromic shift.

Kaufman, Sydney H.; Weber, J. Mathias, E-mail: weberjm@jila.colorado.edu, E-mail: Markus.Pernpointner@pci.uni-heidelberg.de [JILA and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309 (United States); Pernpointner, Markus, E-mail: weberjm@jila.colorado.edu, E-mail: Markus.Pernpointner@pci.uni-heidelberg.de [Physikalisch-Chemisches Institut, Theoretische Chemie, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg (Germany)] [Physikalisch-Chemisches Institut, Theoretische Chemie, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg (Germany)

2013-11-21T23:59:59.000Z

390

The Spectrum of Clean Energy Innovation (Fact Sheet)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

than 30 years, than 30 years, the National Renewable Energy Laboratory (NREL) has advanced the science of renewable energy and energy- efficiency technologies while building the capabilities to guide rapid deployment of commercial applications. Transforming our energy systems to achieve the nation's aggressive economic, environmental, and security goals requires a comprehensive approach. Today, NREL is at the epicenter of this transformation-enabling a future of sustainable energy systems based on clean, cost- effective, and secure resources. The NREL Innovation Spectrum The scope of NREL's capabilities emulates the nature of the innovation process itself. Shepherding new technologies from initial concept to commercial application requires a breadth of expertise across the innovation spectrum,

391

Energy Spectrum of Neutrons from Thermal Fission of U235  

Science Journals Connector (OSTI)

A proton recoil counter has been used to determine the neutron spectrum, in the energy range 3.3-17 Mev, of a beam produced by irradiating 95 percent U235 (metal) in the central experimental hole of the Los Alamos Homogeneous Reactor. Most of the fissions were induced by slow neutrons. The data are combined with those obtained by D. Hill and by T. W. Bonner, R. A. Ferrell and M. C. Rinehart; the composite spectrum so obtained extends from 0.075 to 17 Mev. Fits with two general formulas are discussed.

B. E. Watt

1952-09-15T23:59:59.000Z

392

Scission neutron emission and prompt fission neutron spectrum  

E-Print Network [OSTI]

The mass, energy and angular integrated spectra of prompt fission neutrons for sup 2 sup 3 sup 5 U induced fission in the energy range from thermal to 5 MeV were analyzed. It allows assume that about 0.362+-0.025 neutrons per fission are emitted due to another mechanism then neutron emission from excited fragments after full acceleration. The spectrum of scission neutrons consists of two components with average energy 0.98 MeV and 2.74 MeV. The share of scission neutrons and their spectrum shape estimated in this work does not contradict to results of differential experiments analyzed in previous papers.

Kornilov, N V

2001-01-01T23:59:59.000Z

393

The Cosmic Microwave Background: Beyond the Power Spectrum  

E-Print Network [OSTI]

Much recent work on the cosmic microwave background (CMB) has focussed on the angular power spectrum of temperature anisotropies and particularly on the recovery of cosmological parameters from acoustic peaks in the power spectrum. However, there is more that can conceivably be done with CMB measurements. Here I briefly survey a few such ideas: cross-correlation with other cosmic backgrounds as a probe of the density of the Universe; CMB polarization as a gravitational-wave detector; secondary anisotropies and the ionization history of the Universe; tests of alternative-gravity theories; polarization, the Sunyaev-Zeldovich effect, and cosmic variance; and tests for a neutrino mass.

Marc Kamionkowski

1998-09-24T23:59:59.000Z

394

Ontology-based Spectrum Access Policies for Policy-based Cognitive Radios  

E-Print Network [OSTI]

Ontology-based Spectrum Access Policies for Policy-based Cognitive Radios Behnam Bahrak, Jung radios (CRs) need to be able to cope with the constantly changing spectrum environment, evolving spectrum, to alleviate the spectrum shortage problem. The cognitive radio is seen as one of the key technologies

395

A Coalition Formation Game for Energy-efficient Cooperative Spectrum Sensing in Cognitive Radio  

E-Print Network [OSTI]

A Coalition Formation Game for Energy-efficient Cooperative Spectrum Sensing in Cognitive Radio to realize spectrum reuse and increase the spectrum efficiency in cognitive radio networks (CRNs]. As for spectrum sensing, each SU is required to sense the radio environment within its operating range to find

Wong, Vincent

396

A Contracts-based Approach for Spectrum Sharing Among Cognitive Radios  

E-Print Network [OSTI]

A Contracts-based Approach for Spectrum Sharing Among Cognitive Radios Dileep M. Kalathil spectrum, sharing of spectrum through new paradigms such as cognitive radio sensing, as well Departments University of Southern California rahul.jain @ usc.edu Abstract--Development of dynamic spectrum

Paris-Sud XI, Université de

397

A major radio outburst in III Zw 2 with an extremely inverted, millimeterpeaked spectrum  

E-Print Network [OSTI]

A major radio outburst in III Zw 2 with an extremely inverted, millimeter­peaked spectrum Heino ABSTRACT III Zw 2 is a spiral galaxy with an optical spectrum and faint extended radio structure typical­band radio spectrum between 1.4 and 666 GHz shows a textbook­like synchrotron spectrum peaking at 43 GHz

Falcke, Heino

398

Proportional and Double Imitation Rules for Spectrum Access in Cognitive Radio Networks$  

E-Print Network [OSTI]

Proportional and Double Imitation Rules for Spectrum Access in Cognitive Radio Networks$ Stefano as a promising paradigm to enable more efficient spectrum utilization. Spectrum access models in cognitive radio-scale cognitive radio net- works from an evolutionary game theoretic angle. We formulate the spectrum access

Paris-Sud XI, Université de

399

Collaborative Spectrum Sensing from Sparse Observations Using Matrix Completion for Cognitive Radio Networks  

E-Print Network [OSTI]

Collaborative Spectrum Sensing from Sparse Observations Using Matrix Completion for Cognitive Radio Abstract-- In cognitive radio, spectrum sensing is a key component to detect spectrum holes (i.e., channels not used by any primary users). Collaborative spectrum sensing among the cognitive radio nodes is expected

Yin, Wotao

400

Asymmetric Cooperative Communications Based Spectrum Leasing via Auctions in Cognitive Radio  

E-Print Network [OSTI]

1 Asymmetric Cooperative Communications Based Spectrum Leasing via Auctions in Cognitive Radio for dynamic spectrum sharing (DSS) in cognitive radio networks (CRN's). In this paper, we propose a new way--Cognitive radios, cooperative communications, distributed dynamic spectrum leasing, dynamic spectrum access

Jayaweera, Sudharman K.

Note: This page contains sample records for the topic "response spectrum 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

Dimension Estimation-based Spectrum Sens-ing for Cognitive Radio  

E-Print Network [OSTI]

Dimension Estimation-based Spectrum Sens- ing for Cognitive Radio Bassem Zayen and Aawatif Hayar. Introduction The discrepancy between current-day spectrum allocation and spectrum use sug- gests that radio mean that radios could find and adapt to any immediate local spectrum availability. A new class

Gesbert, David

402

On Performance Evaluation of Cooperative Spectrum Sensing in Cognitive Radio Networks  

E-Print Network [OSTI]

On Performance Evaluation of Cooperative Spectrum Sensing in Cognitive Radio Networks Gang Xiong evaluation for energy-detection based cooperative spectrum sens- ing in cognitive radio networks. Three to exploit under- utilized spectrum and enhance spectrum efficiency. In cog- nitive radio networks, secondary

Yener, Aylin

403

Preamble Design for Non-contiguous Spectrum Usage in Cognitive Radio Networks  

E-Print Network [OSTI]

Preamble Design for Non-contiguous Spectrum Usage in Cognitive Radio Networks Shulan Feng1 spectrum, cognitive radios can operate on unused spectrum channels in their local neighborhoods without utilization. The amount of spectrum usable to cognitive radios depends on not only the primary user

Almeroth, Kevin C.

404

Whether and When to Share: Spectrum Sensing as An Evolutionary Game  

E-Print Network [OSTI]

}@temple.edu Abstract--Cooperative spectrum sensing is an efficient sensing scheme for cognitive radio networks (CRNs), spectrum sensing, game theory, USRP testbed. I. INTRODUCTION Cognitive radio networks (CRNs) [1] enable secondary users (SUs) to utilize the licensed spectrum when primary users (PUs) are not using it. Spectrum

Wu, Jie

405

Cascade atom in high-Q cavity: The spectrum for non-Markovian decay  

E-Print Network [OSTI]

The spontaneous emission spectrum for a three level cascade configuration atom in a single mode high-Q cavity coupled to a zero temperature reservoir of continuum external modes is determined from the atom-cavity mode master equation using the quantum regression theorem. Initially the atom is in its upper state and the cavity mode empty of photons. Following Glauber, the spectrum is defined via the response of a detector atom. Spectra are calculated for the detector located inside the cavity (case A), outside the cavity end mirror (Case B-end emission), or placed for emission out the side of the cavity (Case C). The spectra for case A and case B are found to be essentially the same. In all the cases the predicted lineshapes are free of instrumental effects and only due to cavity decay. Spectra are presented for intermediate and strong coupling regime situations (where both atomic transitions are resonant with the cavity frequency), for cases of non-zero cavity detuning, and for cases where the two atomic transition frequencies differ. The spectral features for Cases B(A) and C are qualitatively similar, with six spectral peaks for resonance cases and eight for detuned cases. These general features of the spectra can be understood via the dressed atom model. However, Case B and C spectra differ in detail, with the latter exhibiting a deep spectral hole at the cavity frequency due to quantum interference effects.

B. J. Dalton; B. M. Garraway

2007-07-08T23:59:59.000Z

406

A review of neuropsychological and neuroimaging research in autistic spectrum disorders: Attention, inhibition and cognitive flexibility  

Science Journals Connector (OSTI)

Autistic spectrum disorders (ASD) are devastating neurodevelopmental disorders of unknown aetiology with characteristic deficits in social interaction, communication and behaviour. Individuals with ASD show deficits in executive function (EF), which are hypothesised to underlie core repetitive, stereotyped behaviours of autism. Neuroimaging research has identified structural brain abnormalities in ASD, which coincide with brain regions involved in EF. Therefore, we reviewed the literature on four specific executive functions in ASD—sustained attention, orienting attention, response inhibition and set shifting. Medline and Embase searches were carried out using specific search terms. This task was followed by the identification of further relevant publications from papers referenced in initial search results. Discussion with experts in neuropsychology, neuroimaging and autism research yielded further publications that were reviewed. Based on these data there is evidence to suggest that deficits in orienting attention, response inhibition and set shifting exist in ASD, but sustained attention ability appears to be normal. A striking lack of research attempting to link neural correlates with these deficits in orienting attention, response inhibition and set shifting was noted. Future research should focus on understanding links between the neuropsychological deficits and structural and functional brain abnormalities.

Jane Sanders; Katherine A. Johnson; Hugh Garavan; Michael Gill; Louise Gallagher

2008-01-01T23:59:59.000Z

407

SIC (MUltiple SIgnal Classification) CSP (Cross-power Spectrum Phase)  

E-Print Network [OSTI]

2ch CSP ( ) 1 MU- SIC (MUltiple SIgnal Classification) CSP (Cross- power Spectrum Phase) [1, 2, 3, 4] [5, 6] [7, 8, 9, 10] [7] CSP CSP [8] [9] CSP [10] Estimation of talker's head orientation based (Kobe univ.) [11] 2ch CSP CSP CSP CSP 2 CSP GCC-PHAT (Generalized Cross- Correlation PHAse Transform

Takiguchi, Tetsuya

408

Sequence Detection Algorithms for Dynamic Spectrum Access Networks  

E-Print Network [OSTI]

Laneman, and Glenn J. Bradford Department of Electrical Engineering, University of Notre Dame E acknowledged that the traditional static allo- cation of wireless bandwidth by governmental regulators. Classical physical (PHY) layer spectrum sensing approaches for a non-cooperating SU, such as coherent

Laneman, J. Nicholas

409

High-Diversity Cooperative Spectrum Sensing in Cognitive Radio Networks  

E-Print Network [OSTI]

High-Diversity Cooperative Spectrum Sensing in Cognitive Radio Networks Guobing Li1,2, Alfonso Cano2 and Shihua Zhu1 1 School of Elect. and Info. Engr., Xi'an Jiaotong University, Xi'an, Shaanxi-mails: {gbli, szhu}@mail.xjtu.edu.cn; alfonso@umn.edu Abstract--This paper develops a cooperative scheme among

Pleite, Alfonso Cano

410

Electron energy-loss spectrum of nanowires G. F. Bertsch  

E-Print Network [OSTI]

Electron energy-loss spectrum of nanowires G. F. Bertsch Institute of Nuclear Theory and Department, Cornell University, Ithaca, New York 14853 Received 8 May 1998 The electronic properties of nanoscale-size fibers can be studied by electron energy-loss spectroscopy with electron beams that pass near the fiber

Bertsch George F.

411

Energy spectrum of muons from their knock-on electrons  

Science Journals Connector (OSTI)

The energy spectrum of muons producing knock-on electrons in medium- and...Z elements has been determined. The energy of a muon can be determined from the energy it transfers to a knock-on electron ... with the d...

A. K. Das

1969-01-11T23:59:59.000Z

412

Energy spectrum of cosmic-ray muons at sea level  

Science Journals Connector (OSTI)

The integral energy spectrum of cosmic-ray muons at sea level in the energy range (200÷7500) GeV is deduced ... this, the effect of fluctuations in the energy losses of muons is taken into account. The deduced muon

S. Miyake; V. S. Narasimham; P. V. Ramana Murthy

1964-01-16T23:59:59.000Z

413

Energy spectrum of a uniformly accelerated detector at finite temperature  

Science Journals Connector (OSTI)

The energy spectrum of the zero-point field of a massless scalar field in the presence of both uniform acceleration and temperature is obtained by the use of the Wightman function. It has an intricate form. However, in two limiting cases, (a) the temperature is approaching zero and (b) the acceleration is approaching zero, it has physically appropriate forms.

H. T. Lee and O. J. Kwon

1991-01-15T23:59:59.000Z

414

Code design based on metric-spectrum and applications  

E-Print Network [OSTI]

We introduced nested search methods to design (n, k) block codes for arbitrary channels by optimizing an appropriate metric spectrum in each iteration. For a given k, the methods start with a good high rate code, say k/(k + 1), and successively...

Papadimitriou, Panayiotis D.

2005-02-17T23:59:59.000Z

415

Influence of temperature on the luminescence spectrum of  

Science Journals Connector (OSTI)

An investigation was made of the influence of temperature on the luminescence spectrum of blue-green single-cell algae in water. It was found that the relative intensity of the maxima changed by 30% when temperature was increased from 0 to 23 °C. This dependence could be used for remote determination of the temperature of water.

F V Bunkin; D V Vlasov; L M Gerasimenko; V P Slobodyanin

1983-01-01T23:59:59.000Z

416

Hyperfine Structure in the Infrared Spectrum of HD  

Science Journals Connector (OSTI)

The hyperfine structure of the vibration-rotation transitions of HD+ is calculated to an accuracy of ± 0.5 MHz. The theoretical spectra confirm the experimental observation that only lines near the center of each transition are intense enough to be detected by the present experiments. The complete spectrum is some 1500 MHz wide and contains structure which has not yet been resolved.

Roger D. Ray and Phillip R. Certain

1977-04-11T23:59:59.000Z

417

Short range spread-spectrum radiolocation system and method  

DOE Patents [OSTI]

A short range radiolocation system and associated methods that allow the location of an item, such as equipment, containers, pallets, vehicles, or personnel, within a defined area. A small, battery powered, self-contained tag is provided to an item to be located. The tag includes a spread-spectrum transmitter that transmits a spread-spectrum code and identification information. A plurality of receivers positioned about the area receive signals from a transmitting tag. The position of the tag, and hence the item, is located by triangulation. The system employs three different ranging techniques for providing coarse, intermediate, and fine spatial position resolution. Coarse positioning information is provided by use of direct-sequence code phase transmitted as a spread-spectrum signal. Intermediate positioning information is provided by the use of a difference signal transmitted with the direct-sequence spread-spectrum code. Fine positioning information is provided by use of carrier phase measurements. An algorithm is employed to combine the three data sets to provide accurate location measurements.

Smith, Stephen F. (Loudon, TN)

2003-04-29T23:59:59.000Z

418

DSASim: A simulation framework for dynamic spectrum allocation  

E-Print Network [OSTI]

School of Electrical Engineering and Computer Science University of Central Florida Orlando, FL 32816 cable or satellite. Another reason is that some services such as public safety are usually allocated and many others leave the spectrum inefficiently allocated. Recently, researchers and manufacturers have

Turgut, Damla

419

On the information content of the matter power spectrum  

E-Print Network [OSTI]

We discuss an analytical approximation for the matter power spectrum covariance matrix and its inverse on translinear scales, $k \\sim 0.1h - 0.8h/\\textrm{Mpc}$ at $z = 0$. We proceed to give an analytical expression for the Fisher information matrix of the nonlinear density field spectrum, and derive implications for its cosmological information content. We find that the spectrum information is characterized by a pair of upper bounds, 'plateaux', caused by the trispectrum, and a 'knee' in the presence of white noise. The effective number of Fourier modes, normally growing as a power law, is bounded from above by these plateaux, explaining naturally earlier findings from $N$-body simulations. These plateaux limit best possible measurements of the nonlinear power at the percent level in a $h^{-3}\\textrm{Gpc}^3$ volume; the extraction of model parameters from the spectrum is limited explicitly by their degeneracy to the nonlinear amplitude. The value of the first, super-survey (SS) plateau depends on the charact...

Carron, Julien; Szapudi, István

2014-01-01T23:59:59.000Z

420

"Light" or the Electromagnetic spectrum www.nasa.gov  

E-Print Network [OSTI]

(absorbed then emitted light) · About the solar atmosphere · About comet tails · About our galaxy · About#12;"Light" or the Electromagnetic spectrum www.nasa.gov #12;Diffraction and Light · When passed through a prism or grating, light is separated into its component wavelengths · This looks like a rainbow

Mojzsis, Stephen J.

Note: This page contains sample records for the topic "response spectrum 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

Blend lines in the polarized spectrum of the Sun  

Science Journals Connector (OSTI)

......July 2012 research-article Papers Blend lines in the polarized spectrum of the Sun K...Astrophysics, Bangalore 560034, India Blend lines form an integral part of the theoretical...Their interaction with other spectral lines needs to be explored and understood before......

K. Sowmya; K. N. Nagendra; M. Sampoorna

2012-07-01T23:59:59.000Z

422

Synthetic Spectrum Methods for Three-Dimensional Supernova Models  

E-Print Network [OSTI]

Current observations stimulate the production of fully three-dimensional explosion models, which in turn motivates three-dimensional spectrum synthesis for supernova atmospheres. We briefly discuss techniques adapted to address the latter problem, and consider some fundamentals of line formation in supernovae without recourse to spherical symmetry. Direct and detailed extensions of the technique are discussed, and future work is outlined.

R. C. Thomas

2003-10-21T23:59:59.000Z

423

I. What is electromagnetic radiation and the electromagnetic spectrum?  

E-Print Network [OSTI]

i­1 I. What is electromagnetic radiation and the electromagnetic spectrum? What do light, X effects on matter. This "stuff" is called electromagnetic radiation, because it travels (radiates) and has electrical and magnetic effects. Electromagnetic radiation is the means for many of our interactions

Sitko, Michael L.

424

Branching fraction and photon energy spectrum for b -> s gamma  

E-Print Network [OSTI]

theory corrections. We obtain first and second moments of the photon energy spectrum above 2.0 GeV, (E gamma) = 2.346 +/- 0.032 +/- 0.011 GeV, and (E-gamma(2)) - (E-gamma)(2) = 0.0226 +/- 0.0066 +/- 0.0020 GeV2, where the errors are statistical...

Ammar, Raymond G.; Bean, Alice; Besson, David Zeke; Zhao, X.

2001-12-01T23:59:59.000Z

425

Spectrum Sharing and Privacy: A Research Agenda Janine S. Hiller  

E-Print Network [OSTI]

in the National Broadband Plan and in the President's Council of Advisors on Science and Technology report security and privacy implications for these possible new designs. Security and privacy become especially government, including military, users and fixed satellite service licensees--share spectrum with Secondary

426

Transverse electric scattering on inhomogeneous objects: spectrum of integral operator and preconditioning  

E-Print Network [OSTI]

The domain integral equation method with its FFT-based matrix-vector products is a viable alternative to local methods in free-space scattering problems. However, it often suffers from the extremely slow convergence of iterative methods, especially in the transverse electric (TE) case with large or negative permittivity. We identify the nontrivial essential spectrum of the pertaining integral operator as partly responsible for this behavior, and the main reason why a normally efficient deflating preconditioner does not work. We solve this problem by applying an explicit multiplicative regularizing operator, which transforms the system to the form `identity plus compact', yet allows the resulting matrix-vector products to be carried out at the FFT speed. Such a regularized system is then further preconditioned by deflating an apparently stable set of eigenvalues with largest magnitudes, which results in a robust acceleration of the restarted GMRES under constraint memory conditions.

Zouros, Grigorios P

2011-01-01T23:59:59.000Z

427

Far-infrared spectrum of ice Ih: A first-principles study  

Science Journals Connector (OSTI)

The dielectric properties of ice Ih in the translational far-infrared region (0–400 cm-1) have been investigated by means of density functional theory methods. We show that interpretation of the experimental data for the absorption coefficient requires a full account of proton disorder, an ab initio description of the electronic response, and a proper treatment of the longitudinal-optical–transverse-optical (LO-TO) splitting. The orientational average for the LO-TO splitting yields a broad range of values, and the average over proton disorder gives rise to a peak at 150 cm-1 in the absorption spectrum of ice Ih. The peak is not present in ice XI, the ferroelectric state with lowest energy. Our study supports the notion that the far-IR dielectric properties of water aggregates are tightly related to local molecular order.

G. Profeta and S. Scandolo

2011-07-05T23:59:59.000Z

428

The 2dF Galaxy Redshift Survey: The power spectrum and the matter content of the universe  

E-Print Network [OSTI]

The 2dF Galaxy Redshift Survey has now measured in excess of 160000 galaxy redshifts. This paper presents the power spectrum of the galaxy distribution, calculated using a direct FFT-based technique. We argue that, within the k-space region 0.02spectrum should be close to that of the linear density perturbations convolved with the window function of the survey. This window function and its convolving effect on the power spectrum estimate are analyzed in detail. By convolving model spectra, we are able to fit the power-spectrum data and provide a measure of the matter content of the universe. Our results show that models containing baryon oscillations are mildly preferred over featureless power spectra. Analysis of the data yields 68% confidence limits on the total matter density times the Hubble parameter \\Omega_m h = 0.20 +/- 0.03, and the baryon fraction \\Omega_b/\\Omega_m = 0.15 +/- 0.07, assuming scale-invariant primordial fluctuations.

Will J. Percival; Carlton M. Baugh; Joss Bland-Hawthorn; Terry Bridges; Russell Cannon; Shaun Cole; Matthew Colless; Chris Collins; Warrick Couch; Gavin Dalton; Roberto De Propris; Simon P. Driver; George Efstathiou; Richard S. Ellis; Carlos S. Frenk; Karl Glazebrook; Carole Jackson; Ofer Lahav; Ian Lewis; Stuart Lumsden; Steve Maddox; Stephen Moody; Peder Norberg; John A. Peacock; Bruce A. Peterson; Will Sutherland; Keith Taylor

2001-05-15T23:59:59.000Z

429

Regional GHG Mitigation Response and Leakage Effects  

E-Print Network [OSTI]

Regional GHG Mitigation Response and Leakage Effects: Scenario Analysis of U.S. Forestry of Analysis · Assess net GHG mitigation potential in forestry & ag · Use FASOM-GHG model · Mitigation results) ­ vary GHG targets ­ vary payment approach · Show regional mitigation potential across U

McCarl, Bruce A.

430

A.O. Smith Corporation Response to Preliminary Plan for Retrospective...  

Energy Savers [EERE]

A.O. Smith Corporation Response to Preliminary Plan for Retrospective Analysis of A.O. Smith Corporation Response to Preliminary Plan for Retrospective Analysis of A.O. Smith...

431

Energy Spectrum of Particles Accelerated in Relativistic Collisionless Shocks  

Science Journals Connector (OSTI)

We analytically study diffusive particle acceleration in relativistic, collisionless shocks. We find a simple relation between the spectral index s and the anisotropy of the momentum distribution along the shock front. Based on this relation, we obtain s=(3?u-2?u?d2+?d3)/(?u-?d) for isotropic diffusion, where ?u (?d) is the upstream (downstream) fluid velocity normalized to the speed of light. This result is in agreement with previous numerical determinations of s for all (?u,?d), and yields s=38/9 in the ultrarelativistic limit. The spectrum-anisotropy connection is useful for testing numerical studies and constraining anisotropic diffusion results. It suggests that the spectrum is highly sensitive to the form of the diffusion function for particles traveling along the shock front.

Uri Keshet and Eli Waxman

2005-03-24T23:59:59.000Z

432

Toward the excited isoscalar meson spectrum from lattice QCD  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

We report on the extraction of an excited spectrum of isoscalar mesons using lattice QCD. Calculations on several lattice volumes are performed with a range of light quark masses corresponding to pion masses down to about ~400 MeV. The distillation method enables us to evaluate the required disconnected contributions with high statistical precision for a large number of meson interpolating fields. We find relatively little mixing between light and strange in most JPC channels; one notable exception is the pseudoscalar sector where the approximate SU(3)F octet, singlet structure of the ?, ?' is reproduced. We extract exotic JPC states, identified as hybrid mesons in which an excited gluonic field is coupled to a color-octet qqbar pair, along with non-exotic hybrid mesons embedded in a qqbar-like spectrum.

Edwards, Robert G. [JLAB; Dudek, Jozef J. [JLAB, Old Dominion U.; Thomas, Christopher Edward [Trinity College, Dublin; Guo, Peng [Indiana U.

2013-11-01T23:59:59.000Z

433

Reconstructing the linear power spectrum of cosmological mass fluctuations  

E-Print Network [OSTI]

We describe an attempt to reconstruct the initial conditions for the formation of cosmological large-scale structure. The power spectrum of the primordial fluctuations is affected by bias, nonlinear evolution and redshift-space distortions, but we show how these effects can be corrected for analytically. Using eight independent datasets, we obtain excellent agreement in the estimated linear power spectra given the following conditions. First, the relative bias factors for Abell clusters, radio galaxies, optical galaxies and IRAS galaxies must be in the ratios 4.5:1.9:1.3:1. Second, the data require redshift-space distortion: $\\Omega^{0.6}/b_{\\ss I} = 1.0 \\pm 0.2$. Third, low values of $\\Omega$ and bias are disfavoured. The shape of the spectrum is extremely well described by a CDM transfer function with an apparent value of the fitting parameter $\\Omega h =0.25$. Tilted models predict too little power at 100 Mpc wavelengths.

J. A. Peacock; S. J. Dodds

1993-11-23T23:59:59.000Z

434

Recovering information of tunneling spectrum from Weakly Isolated Horizon  

E-Print Network [OSTI]

In this paper we investigate the properties of tunneling spectrum from weakly isolated horizon(WIH). We find that there are correlations among Hawking radiations from weakly isolated horizon, the information can be carried out in terms of correlations between sequential emissions, and the radiation is an entropy conservation process. We generalize Refs.[11-13]' results to a more general spacetime. Through revisiting the calculation of tunneling spectrum of weakly isolated horizon, we find that Ref.[12]'s requirement that radiating particles have the same angular momenta of unit mass as that of black hole is not needed, and the energy and angular momenta of emitting particles are very arbitrary which should be restricted only by keeping the cosmic censorship of black hole.

Ge-Rui Chen; Yong-Chang Huang

2014-06-02T23:59:59.000Z

435

Studying 21cm power spectrum with one-point statistics  

E-Print Network [OSTI]

The redshifted 21cm line signal from neutral hydrogens is a promising tool to probe the cosmic dawn and the epoch of reionization (EoR). Ongoing and future low-frequency radio experiments are expected to detect its fluctuations, especially through the power spectrum. In this paper, we give a physical interpretation of the time evolution of the power spectrum of the 21cm brightness temperature fluctuations, which can be decomposed into dark matter density, spin temperature and neutral fraction of hydrogen fluctuations. From the one-point statistics of the fluctuations, such as variance and skewness, we find that the peaks and dips in the time evolution are deeply related to X-ray heating of the intergalactic gas, which controls the spin temperature. We suggest the skewness of the brightness temperature distribution is a key observable to identify the onset of X-ray heating.

Shimabukuro, Hayato; Takahashi, Keitaro; Yokoyama, Shuichiro; Ichiki, Kiyotomo

2014-01-01T23:59:59.000Z

436

Auger spectrum of the LiF molecule  

Science Journals Connector (OSTI)

The Auger spectrum of LiF vapor has been measured in the energy region 600-680 eV by means of electron-beam excitation. The assignment of the peak structure is based on theoretical ab initio calculations with the use of the multiconfigurational complete-active-space self-consistent-field method and by comparison with the corresponding spectra of the neon atom and the hydrogen fluoride molecule.

Matti Hotokka; Hans Ågren; Helena Aksela; Seppo Aksela

1984-10-01T23:59:59.000Z

437

The energy production rate & the generation spectrum of UHECRs  

E-Print Network [OSTI]

We derive simple analytic expressions for the flux and spectrum of ultra-high energy cosmic-rays (UHECRs) predicted in models where the CRs are protons produced by extra-Galactic sources. For a power-law scaling of the CR production rate with redshift and energy, d\\dot{n} /dE\\propto E^-\\alpha (1+z)^m, our results are accurate at high energy, E>10^18.7 eV, to better than 15%, providing a simple and straightforward method for inferring d\\dot{n}/dE from the observed flux at E. We show that current measurements of the UHECR spectrum, including the latest Auger data, imply E^2d\\dot{n}/dE(z=0)=(0.45\\pm0.15)(\\alpha-1) 10^44 erg Mpc^-3 yr^-1 at E<10^19.5 eV with \\alpha roughly confined to 2\\lesseq\\alpha<2.7. The uncertainty is dominated by the systematic and statistic errors in the experimental determination of individual CR event energy, (\\Delta E/E)_{sys} (\\Delta E/E)_{stat} ~20%. At lower energy, d\\dot{n}/dE is uncertain due to the unknown Galactic contribution. Simple models in which \\alpha\\simeq 2 and the transition from Galactic to extra-Galactic sources takes place at the "ankle", E ~10^19 eV, are consistent with the data. Models in which the transition occurs at lower energies require a high degree of fine tuning and a steep spectrum, \\alpha\\simeq 2.7, which is disfavored by the data. We point out that in the absence of accurate composition measurements, the (all particle) energy spectrum alone cannot be used to infer the detailed spectral shapes of the Galactic and extra-Galactic contributions.

Boaz Katz; Ran Budnik; Eli Waxman

2009-03-18T23:59:59.000Z

438

Hydrogen-atom spectrum under a minimal-length hypothesis  

E-Print Network [OSTI]

The energy spectrum of the Coulomb potential with minimal length commutation relations $[X_i, P_j] = i\\hbar\\{\\delta_{ij}(1+\\beta P^2) + \\beta'P_iP_j\\}$ is determined both numerically and perturbatively for arbitrary values of $\\beta'/\\beta$ and angular momenta $\\ell$. The constraint on the minimal length scale from precision hydrogen spectroscopy data is of order of a few GeV$\

Sandor Benczik; Lay Nam Chang; Djordje Minic; Tatsu Takeuchi

2005-07-08T23:59:59.000Z

439

Information content of the non-linear matter power spectrum  

E-Print Network [OSTI]

We use an ensemble of N-body simulations of the currently favoured (concordance) cosmological model to measure the amount of information contained in the non-linear matter power spectrum about the amplitude of the initial power spectrum. Two surprising results emerge from this study: (i) that there is very little independent information in the power spectrum in the translinear regime (k ~ 0.2-0.8 Mpc/h at the present day) over and above the information at linear scales and (ii) that the cumulative information begins to rise sharply again with increasing wavenumber in the non-linear regime. In the fully non-linear regime, the simulations are consistent with no loss of information during translinear and non-linear evolution. If this is indeed the case then the results suggest a picture in which translinear collapse is very rapid, and is followed by a bounce prior to virialization, impelling a wholesale revision of the HKLM-PD formalism.

C. D. Rimes; A. J. S. Hamilton

2005-02-03T23:59:59.000Z

440

NREL: Energy Analysis - Jennie Jorgenson  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and dispatch modeling Integrating concentrating solar power, energy storage, and demand response into power grid models Quantitativestatistical analysis and modeling Primary...

Note: This page contains sample records for the topic "response spectrum 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

Influence of the electron-exchange and quantum shielding on the bremsstrahlung spectrum in degenerate quantum plasmas  

SciTech Connect (OSTI)

The influence of the electron-exchange and quantum shielding on the bremsstrahlung spectrum is investigated in degenerate quantum plasmas. The impact-parameter analysis with the Shukla-Eliasson potential is applied to obtain the electron-ion bremsstrahlung radiation cross section as a function of the impact parameter, photon energy, projectile energy, electron-exchange parameter, Fermi energy, and plasmon energy. The result shows that the electron-exchange effect strongly enhances the bremsstrahlung radiation spectrum in degenerate quantum plasmas. It is also shown that the influence of the electron-exchange broadens the photon emission range in the electron-ion bremsstrahlung process. It is found that the electron-exchange effect focuses the bremsstrahlung photon energy in the soft photon domain. In addition, it is found that the bremsstrahlung radiation cross section increases with an increase of the Fermi energy and, however, decreases with increasing plasmon energy.

Jung, Young-Dae [Department of Electrical and Computer Engineering, MC 0407, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0407, USA and Department of Applied Physics, Hanyang University, Ansan, Kyunggi-Do 426-791 (Korea, Republic of)] [Department of Electrical and Computer Engineering, MC 0407, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0407, USA and Department of Applied Physics, Hanyang University, Ansan, Kyunggi-Do 426-791 (Korea, Republic of)

2013-10-15T23:59:59.000Z

442

SIC (MUltiple SIgnal Classification) CSP (Cross-power Spectrum Phase)  

E-Print Network [OSTI]

, 6] [7, 8, 9, 10] [7] SRP-PHAT (Steered Response Power with the PHAse Transform) SRP-PHAT [8] [9] SRP

Takiguchi, Tetsuya

443

Spectral Analysis of Wave Motions in the Region of Temperature Minimum of the Sun’s Atmosphere  

Science Journals Connector (OSTI)

We present some results of an analysis of the spatial spectrum and two-dimensional distribution of horizontally running waves of five-minute oscillations.

V. E. Merkulenko; V. I. Polyakov; V. S. Loskutnikov

1982-01-01T23:59:59.000Z

444

Mass Market Demand Response  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Mass Market Demand Response Mass Market Demand Response Speaker(s): Karen Herter Date: July 24, 2002 - 12:00pm Location: Bldg. 90 Demand response programs are often quickly and poorly crafted in reaction to an energy crisis and disappear once the crisis subsides, ensuring that the electricity system will be unprepared when the next crisis hits. In this paper, we propose to eliminate the event-driven nature of demand response programs by considering demand responsiveness a component of the utility obligation to serve. As such, demand response can be required as a condition of service, and the offering of demand response rates becomes a requirement of utilities as an element of customer service. Using this foundation, we explore the costs and benefits of a smart thermostat-based demand response system capable of two types of programs: (1) a mandatory,

445

The Spectrum of the Kinematic Dynamo Operator for an Ideally Conducting Fluid  

E-Print Network [OSTI]

The Spectrum of the Kinematic Dynamo Operator for an Ideally Conducting Fluid dynamo operator and of the corresponding group it generates for an ideally conducting fluid, 2001 Abstract The spectrum of the kinematic dynamo operator

Montgomery-Smith, Stephen

446

Data Collection, Analysis, and Reporting  

Office of Energy Efficiency and Renewable Energy (EERE)

The Data Collection, Analysis, and Reporting business line is responsive to the Office of Energy Efficiency and Renewable Energy's (EERE) need for timely, accurate, and detailed analysis reporting...

447

Demand Response Assessment INTRODUCTION  

E-Print Network [OSTI]

Demand Response Assessment INTRODUCTION This appendix provides more detail on some of the topics raised in Chapter 4, "Demand Response" of the body of the Plan. These topics include 1. The features, advantages and disadvantages of the main options for stimulating demand response (price mechanisms

448

364 IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 31, NO. 3, MARCH 2013 Censored Truncated Sequential Spectrum  

E-Print Network [OSTI]

of the licensed electromag- netic spectrum [1]. Cognitive radios opportunistically share the spectrum while Sequential Spectrum Sensing for Cognitive Radio Networks Sina Maleki and Geert Leus Abstract--Reliable spectrum sensing is a key functionality of a cognitive radio network. Cooperative spectrum sensing improves

Leus, Geert

449

Telecommunications Policy 28 (2004) 603618 Real-time secondary markets for spectrum  

E-Print Network [OSTI]

Telecommunications Policy 28 (2004) 603­618 Real-time secondary markets for spectrum Jon M. Peha*,1

Peha, Jon M.

450

CHEMILUMINESCENT CHEMI-IONIZATION: Ar* + Ca AND THE CaAr+ EMISSION SPECTRUM  

SciTech Connect (OSTI)

A flowing afterglow chemiluminescence apparatus has been used to analyze visible fluorescence in the Ar* ({sup 3}P{sub 2}{sup o}) + Ca ({sup 1}S{sub 0}) reaction. The rate constants for production of Ca{sup +} ({sup 2}P{sub 3/2}{sup o}) and Ca{sup +} ({sup 2}P{sub 1/2}{sup o}) were measured to be 1.6 x 10{sup -10} cm{sup 3}-molecule{sup -1} sec{sup -1} and 3.2 x 10{sup -11} cm{sup 3} molecule{sup -1} sec{sup -1}, respectively. These results demonstrate a transfer of the total electronic angular momentum polarization in Ar* tothe excited ion levels. The molecular band spectrum of the associative ionization product CaAr{sup +} (A{sup 2}{Pi}) was observed. Molecular fluorescence constituted 14% of the total fluorescence from all ion products. This spectrum was analyzed with a model (exp-Z4) potential, yielding, for the ground state, {Chi}{sup 2}{Sigma}{sup +}, R{sub e} = 2.8 {angstrom}, {omega}''{sub e} = 87 cm{sup -1}, and D''{sub e} = 1000 cm{sup -1}, and, for the A{sup 2}{Pi} state, R{sub e} = 2.6 {angstrom}, {omega}'{sub e} = 200 cm{sup -1}, and D'{sub e} = 4900 cm{sup -1}. The nascent internal state distribution in CaAr{sup +} is found to consist of a fairly narrow range of high vibrational levels. The analysis of spectra from chemiluminescent reaction is a well established technique for elucidating the product state distributions of elementary processes. In this paper, they use the analysis of the chemiluminescent chemi-ionization reactions between metastable argon atoms and calcium atoms to expose the dynamics of associative ionization (AI) and to measure the branching ratios for chemi-ionization into more than one product channel.

Hartman, Dennis C.; Winn, John S.

1980-09-01T23:59:59.000Z

451

Material Effects and Detector Response Corrections for Bunch Length Measurements  

SciTech Connect (OSTI)

A typical diagnostic used to determine the bunch length of ultra-short electron bunches is the auto-correlation of coherent transition radiation. This technique can produce artificially short bunch length results due to the attenuation of low frequency radiation if corrections for the material properties of the Michelson interferometer and detector response are not made. Measurements were taken using FTIR spectroscopy to determine the absorption spectrum of various materials and the response of a Molectron P1-45 pyroelectric detector. The material absorption data will be presented and limitations on the detector calibration discussed.

Zacherl, W.; Blumenfeld, I.; Berry, M.; Decker, F.-J.; Hogan, M.J.; Ischebeck, R.; Iverson, R.; Kirby, N.; 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

452

Solar Energetic Particle Spectrum on 13 December 2006 Determined by IceTop  

SciTech Connect (OSTI)

The IceTop air shower array now under construction at the South Pole as the surface component of the IceCube neutrino telescope (Achterberg et al. 2006) detected an unusual near-solar-minimum Ground Level Enhancement (GLE) after a solar flare on 13 December 2006. Beginning at 0220 UT, the 4B class flare occurred at solar coordinates S06 W24, accompanied by strong (X3.4) X-ray emission and type II and IV radio bursts. The LASCO coronagraph on the SOHO spacecraft observed a halo CME launch from the Sun at {approx} 0225 UT with speed estimated to be {approx} 1770 km/s. We have begun (Bieber et al. 2007) a comprehensive analysis of the propagation of solar energetic particles in this event. However the focus of this Letter is the new and unique ability of IceTop to derive the energy spectrum of these particles in the multi-GeV regime from a single detector with a well defined viewing direction. When completed, IceTop will have approximately 500 square meters of ice Cherenkov collecting area arranged in an array of 80 stations on a 125 m triangular grid to detect air showers from one PeV to one EeV. Each station consists of two, two meter diameter tanks filled with ice to a depth of 90 cm. Tanks are instrumented with two Digital Optical Modules (DOM) operated at different gain settings to provide appropriate dynamic range to cover both large and small air showers. Each DOM contains a 10 inch photomultiplier and an advanced readout system capable of digitizing the full waveform. For historical reasons, the two discriminator counting rates recorded in each DOM are termed SPE (Single Photo Electron), and MPE (Multi Photo Electron). In the present analysis the SPE threshold corresponds approximately to 20 photoelectrons (PE), and the MPE threshold to 100 PE. Due to the high altitude (2835m) and the nearly zero geomagnetic cutoff at the South Pole, secondary particle spectra at the detector retain a significant amount of information on the spectra of the primary particles. In a thin, ionization detector these secondary particles either would not interact, or would produce virtually indistinguishable signals. This is not the case in the thick Ice-Top detector, where a traversing muon produces 130 PE and the typical electron only 15 PE. Signal amplitude therefore carries information about the composition and spectra of the incident particles, albeit integrated over broad regions of the spectrum. In particular, differences in counting rates of discriminators at different thresholds allow us to infer the particle spectrum incident at the top of the atmosphere.

IceCube Collaboration; Klein, Spencer

2008-10-11T23:59:59.000Z

453

Spectrum-Sensing Opportunistic Wireless Relay Networks: Outage and Diversity Performance  

E-Print Network [OSTI]

Lee Aylin Yener Wireless Communications and Networking Laboratory Electrical Engineering Department cooperatively sense the spectrum and help the designated cognitive relay node. I. INTRODUCTION The demand. Currently, the radio spectrum is regulated and the licensed spectrum bands are not "shared". On the other

Yener, Aylin

454

The energy spectrum of neutrons produced by cosmic ray muons in LVD  

Science Journals Connector (OSTI)

The energy spectrum of neutrons produced by cosmic ray muons in the underground detector LVD (3650 m.w.e.) is obtained for the energy range of 30–450 MeV. The spectrum is derived using the energy release spectrum...

N. Yu. Agafonova; V. V. Boyarkin…

2009-05-01T23:59:59.000Z

455

Optimal Spectrum Sharing for Multi-hop Software Defined Radio Networks  

E-Print Network [OSTI]

Optimal Spectrum Sharing for Multi-hop Software Defined Radio Networks Y. Thomas Hou Yi Shi Hanif D. The uneven size of bands in the radio spectrum prompts the need of further division into sub the required network-wide radio spectrum resource for a set of user sessions. Since such problem formulation

Hou, Y. Thomas

456

Computer Networks 00 (2012) 120 Spectrum Access Policy Reasoning for Policy-Based Cognitive Radios  

E-Print Network [OSTI]

}@vt.edu Abstract Cognitive radio (CR) is one of the key enabling technologies for opportunistic spectrum sharing. In such a spec- trum sharing paradigm, radios access spectrum opportunistically by identifying the under. Keywords: Spectrum access policy, cognitive radio, policy reasoner, binary decision diagram, policy algebra

457

Competitive Sharing of the Spectrum in Cognitive Radio Network: A Market Equilibrium Framework  

E-Print Network [OSTI]

Competitive Sharing of the Spectrum in Cognitive Radio Network: A Market Equilibrium Framework of pricing the spectrum usage in a cognitive radio network. In such a network, where licensed/primary users radio spectrum allocation scheme requires that the telecommunication industry's regulator (for example

Paris-Sud XI, Université de

458

Opportunistic Spectrum Scheduling for Mobile Cognitive Radio Networks in White Space  

E-Print Network [OSTI]

Opportunistic Spectrum Scheduling for Mobile Cognitive Radio Networks in White Space Li Zhang, Kai of secondary users, carefully scheduling the spectrum allocation in cognitive radio networks operating on white in an opportunistic manner, this paper studies how to schedule the spectrum assignment for mobile cognitive radio

California at Davis, University of

459

SUBJECT: Effective Date: Policy Number: Radio Frequency Spectrum 12-15-10 4-011  

E-Print Network [OSTI]

SUBJECT: Effective Date: Policy Number: Radio Frequency Spectrum 12-15-10 4-011 Supersedes: Page. POLICY STATEMENT: Radio frequency spectrum is a critical resource that must be managed to eliminate be approved by UCF Computer Services & Telecommunications to provide spectrum coordination and avoid radio

Glebov, Leon

460

TRIESTE: A Trusted Radio Infrastructure for Enforcing SpecTrum Etiquettes  

E-Print Network [OSTI]

1 TRIESTE: A Trusted Radio Infrastructure for Enforcing SpecTrum Etiquettes Wenyuan Xu Pandurang presents a framework, known as TRIESTE (Trusted Radio Infrastructure for Enforcing SpecTrum Etiquettes), which can ensure that radio devices are only able to access/use the spectrum in a manner that conforms

Xu, Wenyuan

Note: This page contains sample records for the topic "response spectrum 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

ROSA: Distributed Joint Routing and Dynamic Spectrum Allocation in Cognitive Radio Ad Hoc Networks  

E-Print Network [OSTI]

ROSA: Distributed Joint Routing and Dynamic Spectrum Allocation in Cognitive Radio Ad Hoc Networks opportunistic spectrum access and dynamic routing algorithm for cognitive radio networks is proposed, called Keywords Cognitive Radio Networks, routing, dynamic spectrum allocation, cross-layer design 1. INTRODUCTION

Melodia, Tommaso

462

Cooperative Spectrum Sensing and Localiza-tion in Cognitive Radio Systems using Com-  

E-Print Network [OSTI]

Cooperative Spectrum Sensing and Localiza- tion in Cognitive Radio Systems using Com- pressed features in cog- nitive radio systems (CRS): spectrum sensing and location awareness in a single compressed implementing a cognitive radio system. The major problem for spectrum sensing arises in wideband radio, when

Gesbert, David

463

Quickest Spectrum Sensing in Cognitive Radio Husheng Li, Chengzhi Li and Huaiyu Dai  

E-Print Network [OSTI]

1 Quickest Spectrum Sensing in Cognitive Radio Husheng Li, Chengzhi Li and Huaiyu Dai Abstract spectrum sensing in secondary radio systems without data fusion centers. Performance is evaluated using to detect the primary radio signal. The fundamental limits of spectrum sensing are discussed in [15] while

Dai, Huaiyu

464

Imitation-based Spectrum Access Policy for CSMA/CA-based Cognitive Radio Networks  

E-Print Network [OSTI]

1 Imitation-based Spectrum Access Policy for CSMA/CA-based Cognitive Radio Networks Stefano Iellamo spectrum access protocols in cognitive radio networks. Second, evolutionary game theory provides is particularly suited in decentralized environments as cognitive radio networks. We formulate the spectrum access

Coupechoux, Marceau

465

A Graphical Framework for Spectrum Modeling and Decision Making in Cognitive Radio Networks  

E-Print Network [OSTI]

1 A Graphical Framework for Spectrum Modeling and Decision Making in Cognitive Radio Networks occupancies in cognitive radio networks. It is known that there exist correlations of spectrum occupancies for the inference and decision problems related to spectrum ac- tivities in cognitive radio networks. Bayesian

Qiu, Robert Caiming

466

An Auction Framework for Spectrum Allocation with Interference Constraint in Cognitive Radio Networks  

E-Print Network [OSTI]

1 An Auction Framework for Spectrum Allocation with Interference Constraint in Cognitive Radio for cognitive radio networks to allow unlicensed secondary users (SUs) to share the available spectrum problem of designing efficient spectrum allocation mechanism for cogni- tive radio networks. We consider

Coupechoux, Marceau

467

Nine Regimes of Radio Spectrum Management: A 4-Step Decision Guide  

E-Print Network [OSTI]

1 Nine Regimes of Radio Spectrum Management: A 4-Step Decision Guide Gérard POGOREL Ecole Nationale N°65 April 2007 Summary Diverse radio spectrum management regimes are defined according to 4 levels in the next decade. The generally accepted view is that this will provoke an increased need for radio spectrum

Paris-Sud XI, Université de

468

Cooperative Robust Sequential Detection Algorithms for Spectrum Sensing in Cognitive Radio  

E-Print Network [OSTI]

Cooperative Robust Sequential Detection Algorithms for Spectrum Sensing in Cognitive Radio Arun consider the problem of Spectrum Sensing in Cogni- tive Radio Networks. In our previous work we have algorithm. We also analyze these algorithms theoretically. Keywords-Cognitive Radio, Cooperative Spectrum

Sharma, Vinod

469

Spectrum Management of Cognitive Radio Using Multi-agent Reinforcement Learning  

E-Print Network [OSTI]

Spectrum Management of Cognitive Radio Using Multi-agent Reinforcement Learning Cheng Wu spectrum management can signif- icantly reduce the interference to the licensed users, while maintaining: Spectrum Management of Cognitive Radio Using Multi-agent Reinforcement Learning, C. Wu, K. Chowdhury, M. D

Meleis, Waleed

470

Auction Mechanism for Spectrum Allocation and Profit Sharing Sung Hyun Chun and Richard J. La  

E-Print Network [OSTI]

is an operator that provides mobile communication services without its own licensed spectrum and necessary flexible use of spectrum is based on Cognitive Radio (CR) [14], which is being con- sidered as a candidate for the spectrum. There are several proposed solutions to ensuring that CR users do not interfere with licensed

La, Richard J.

471

Optimal Myopic Sensing and Dynamic Spectrum Access in Cognitive Radio Networks with  

E-Print Network [OSTI]

1 Optimal Myopic Sensing and Dynamic Spectrum Access in Cognitive Radio Networks with Low primary channels that are licensed to primary users. We consider a group of SU's with limited spectrum. Index Terms--Cognitive radios, dynamic spectrum access (DSA), Markov chains, partially observable Markov

Jayaweera, Sudharman K.

472

A Distributed Framework with a Novel Pricing Model for Enabling Dynamic Spectrum Access for  

E-Print Network [OSTI]

years. Wireless Service Providers (WSPs) have been investing heavily in the licensed spectrum to satisfy this ever increasing demand, thus making the scarce radio spectrum a very expensive resource. Underutilization of the radio spectrum in both spatial and temporal domains, indi- cating the inefficient usage

Yanikomeroglu, Halim

473

Distributed Spectrum Sensing in Cognitive Radio Networks with Fairness Consideration: Efficiency of  

E-Print Network [OSTI]

Distributed Spectrum Sensing in Cognitive Radio Networks with Fairness Consideration: Efficiency the spectrum of the licensed users. The licensed users are called primary users and the users of the cognitive radio network are called secondary users. Spectrum sensing is a crucial function for cognitive radio

Yuen, Chau

474

Spectrum auction with interference constraint for cognitive radio networks with multiple primary and secondary users  

E-Print Network [OSTI]

Spectrum auction with interference constraint for cognitive radio networks with multiple primary shown the benefits of cognitive radio technologies to improve the flexibility and efficiency of spectrum (SUs) to share the available spectrum of licensed primary users (PUs) fairly and efficiently, subject

Coupechoux, Marceau

475

The Primary User Emulation Attack in Dynamic Spectrum Access Networks: A Game Theoretic  

E-Print Network [OSTI]

Cognitive radio enabled dynamic spectrum access networks are designed to detect and opportunistically utilize the unused or under-utilized spectrum bands. However, due to the open paradigm of cognitive radio Communication Commission (FCC). This new policy would allow unused, licensed spectrum bands (white spaces

Subbalakshmi, K.P. "Suba"

476

Spectral Efficiency of Spectrum Pooling Systems Majed Haddad and Aawatif Hayar  

E-Print Network [OSTI]

as a mean to implement efficient reuse of the licensed spectrum. The key feature of cognitive radios In this contribution, we investigate the idea of using cognitive radio to reuse locally unused spectrum to increase the proposed scheme is based on the notion of spectrum pooling. The idea is quite simple: a cognitive radio

Boyer, Edmond

477

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

E-Print Network [OSTI]

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

Paris-Sud XI, Université de

478

CAMECO SPECTRUM 2013 January 2013 College of Engineering University Of Saskatchewan  

E-Print Network [OSTI]

CAMECO SPECTRUM 2013 January 2013 College of Engineering University Of Saskatchewan Room 1C03.2, College of Engineering · University of Saskatchewan 57 Campus Drive · Saskatoon, SK · S7N 5A9 spectrum SPECTRUM 2013 January 2013 College of Engineering University Of Saskatchewan Room 1C03.2, College

Saskatchewan, University of

479

NF3: UV absorption spectrum temperature dependence and the atmospheric and climate forcing implications  

E-Print Network [OSTI]

NF3: UV absorption spectrum temperature dependence and the atmospheric and climate forcing absorption spectrum, s(l,T), was measured at 16 wavelengths between 184.95 and 250 nm at temperatures between. Including the UV absorption spectrum temperature dependence increased the stratospheric photolysis lifetime

Jackman, Charles H.

480

THE NEAR-INFRARED SPECTRUM OF THE BROWN DWARF GLIESE 229B T. R. GEBALLE  

E-Print Network [OSTI]

THE NEAR-INFRARED SPECTRUM OF THE BROWN DWARF GLIESE 229B T. R. GEBALLE Joint Astronomy Centre, 660 vapor. Water and methane are both shown to be strong absorbers in the near-infrared spectrum. (1995) obtained a low-resolution ( / 2 150) near-infrared (1­2.5 m) spectrum of Gl 229B and found

Sloan, Gregory C.

Note: This page contains sample records for the topic "response spectrum 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

On the Nonlinear Transfer of Energy in the Peak of a Gravity-Wave Spectrum. II  

Science Journals Connector (OSTI)

...Nonlinear Transfer of Energy in the Peak of a Gravity-Wave Spectrum. II M. J...nonlinear transfer of energy within a continuous spectrum of water waves. The spectrum is assumed...narrow, that is, the wave energy is initially concentrated...

1976-01-01T23:59:59.000Z

482

Advanced Demand Responsive Lighting  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Demand Demand Responsive Lighting Host: Francis Rubinstein Demand Response Research Center Technical Advisory Group Meeting August 31, 2007 10:30 AM - Noon Meeting Agenda * Introductions (10 minutes) * Main Presentation (~ 1 hour) * Questions, comments from panel (15 minutes) Project History * Lighting Scoping Study (completed January 2007) - Identified potential for energy and demand savings using demand responsive lighting systems - Importance of dimming - New wireless controls technologies * Advanced Demand Responsive Lighting (commenced March 2007) Objectives * Provide up-to-date information on the reliability, predictability of dimmable lighting as a demand resource under realistic operating load conditions * Identify potential negative impacts of DR lighting on lighting quality Potential of Demand Responsive Lighting Control

483

Excitation spectrum and quasiparticles in quantum gases. A rigorous approach  

E-Print Network [OSTI]

This thesis is devoted to a rigorous study of interacting quantum gases. The main objects of interest are the closely related concepts of excitation spectrum and quasiparticles. The immediate motivation of this work is to propose a spectral point of view concerning these two concepts. In the first part of this thesis we discuss the concepts of excitation spectrum and quasiparticles. We provide an overview of physical motivations and based on that we propose a spectral and Hamiltonian-based approach towards these terms. Based on that, we formulate definitions and propositions related to these concepts. In the second part we recall the Bogoliubov and Hartree-Fock-Bogoliubov approximations, which in the physics literature are used to obtain the quasiparticle picture. We show how these two approaches fit into a universal scheme which allows us to arrive at a quasiparticle picture in a more general setup. This scheme is based on the minimization of Hamiltonians over the so-called Gaussian states. Its abstract formulation is the content of Beliaev's Theorem. In the last part we present a rigorous result concerning the justification of the Bogoliubov approximation. This justification employs the concept of the mean-field and infinite-volume limit. We show that for a large number of particles, a large volume and a sufficiently high density, the low-lying energy-momentum spectrum of the homogeneous Bose gas is well described by the Bogoliubov approximation. This result, which is formulated in the form of a theorem, can be seen as the main result of this thesis.

Marcin Napiórkowski

2014-09-02T23:59:59.000Z

484

The Spectrum of Fluorine, F II, F III, F IV  

Science Journals Connector (OSTI)

The spectrum of fluorine extending from 125A to 620A has been obtained by using a two-meter grazing-incidence spectrograph. A large number of these lines, including nearly all of the stronger ones, have been classified as transitions in the F II, F III and F IV ions. This has made possible the classification of additional lines measured by Dingle in the longer wave-length regions. These analyses yield the following ionization potentials: F II 34.81 volts, F III 62.35 volts, F IV 87.34 volts.

I. S. Bowen

1934-01-15T23:59:59.000Z

485

Energy spectrum of ultra high energy cosmic rays  

E-Print Network [OSTI]

The construction of the southern site of the Pierre Auger Observatory is almost completed. Three independent measurements of the flux of the cosmic rays with energies larger than 1 EeV have been performed during the construction phase. The surface detector data collected until August 2007 have been used to establish a flux suppression at the highest energies with a 6 sigma significance. The observations of cosmic rays by the fluorescence detector allowed the extension of the energy spectrum to lower energies, where the efficiency of the surface detector is less than 100% and a change in the spectral index is expected.

Ioana C. Maris; for the Pierre Auger Collaboration

2008-08-12T23:59:59.000Z

486

Emission spectrum of the atomic chain excited by channeled particle  

E-Print Network [OSTI]

Basic properties of radiation of the atomic chains excited by a channeled particle are considered. Using a very simple two-dimensional model of a crystal lattice we have shown that the main part of this radiation is generated on the frequency of oscillations of a channeled particle between the crystal planes, shifted by the Doppler effect. Spectral and angular distribution and spectral distribution of the radiation of the atomic chain excited by channeled particle were calculated. Emission spectrum of the atomic chain excited by channeled particle was plotted.

Epp, V

2014-01-01T23:59:59.000Z

487

Reconstruction of the Primordial Power Spectrum by Direct Inversion  

E-Print Network [OSTI]

We introduce a new method for reconstructing the primordial power spectrum, $P(k)$, directly from observations of the Cosmic Microwave Background (CMB). We employ Singular Value Decomposition (SVD) to invert the radiation perturbation transfer function. The degeneracy of the multipole $\\ell$ to wavenumber $k$ linear mapping is thus reduced. This enables the inversion to be carried out at each point along a Monte Carlo Markov Chain (MCMC) exploration of the combined $P(k)$ and cosmological parameter space. We present best--fit $P(k)$ obtained with this method along with other cosmological parameters.

Nicholson, Gavin; Paykari, Paniez

2009-01-01T23:59:59.000Z

488

Neutron Activation Analysis for the Demonstration of Amphibolite Rock-Weathering Activity of a Yeast  

Science Journals Connector (OSTI)

...research-article General Microbial Ecology Neutron Activation Analysis for the Demonstration...University of Kiel, Kiel, Germany Neutron activation analysis was employed in a...demonstrated by comparing a spectrum of neutron-activated amphibolite powder (particle...

E. Rades-Rohkohl; P. Hirsch; O. Fränzle

1979-12-01T23:59:59.000Z

489

The effect of aberration on partial-sky measurements of the cosmic microwave background temperature power spectrum  

E-Print Network [OSTI]

Our motion relative to the cosmic-microwave-background (CMB) rest frame deflects light rays giving rise to shifts as large as L -> L(1+-beta), where beta=0.00123 is our velocity (in units of the speed of light) on measurements of small-scale (large multipole moment L) CMB fluctuations. For measurements at L>1000, where the CMB power spectrum varies roughly as C(L) ~ L^-7, the fractional change to the power spectrum measured on a small sky patch can be as large as Delta C(L)/C(L)~7*beta~1%, larger than the measurement uncertainties in several current experiments. Here we present a novel harmonic-space approach to this CMB aberration that improves upon prior work by allowing us to (i) go to higher orders in beta, thus extending the validity of the analysis to measurements at L>1/beta~800; and (ii) treat the effects of window functions and pixelization in a more accurate and computationally efficient manner. We calculate precisely the magnitude of the systematic bias in the power spectrum inferred from current S...

Jeong, Donghui; Dai, Liang; Kamionkowski, Marc; Wang, Xin

2014-01-01T23:59:59.000Z

490

Demand response enabling technology development  

E-Print Network [OSTI]

Demand Response Enabling Technology Development Phase IEfficiency and Demand Response Programs for 2005/2006,Application to Demand Response Energy Pricing” SenSys 2003,

2006-01-01T23:59:59.000Z

491

Demand Response Spinning Reserve Demonstration  

E-Print Network [OSTI]

F) Enhanced ACP Date RAA ACP Demand Response – SpinningReserve Demonstration Demand Response – Spinning Reservesupply spinning reserve. Demand Response – Spinning Reserve

2007-01-01T23:59:59.000Z

492

Cross-sector Demand Response  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Resources News & Events Expand News & Events Skip navigation links Smart Grid Demand Response Agricultural Residential Demand Response Commercial & Industrial Demand Response...

493

Demand Response Programs for Oregon  

E-Print Network [OSTI]

Demand Response Programs for Oregon Utilities Public Utility Commission May 2003 Public Utility ....................................................................................................................... 1 Types of Demand Response Programs............................................................................ 3 Demand Response Programs in Oregon

494

Demand response enabling technology development  

E-Print Network [OSTI]

behavior in developing a demand response future. Phase_II_Demand Response Enabling Technology Development Phase IIYi Yuan The goal of the Demand Response Enabling Technology

Arens, Edward; Auslander, David; Huizenga, Charlie

2008-01-01T23:59:59.000Z

495

Automated Demand Response and Commissioning  

E-Print Network [OSTI]

Fully-Automated Demand Response Test in Large Facilities14in DR systems. Demand Response using HVAC in Commercialof Fully Automated Demand Response in Large Facilities”

Piette, Mary Ann; Watson, David S.; Motegi, Naoya; Bourassa, Norman

2005-01-01T23:59:59.000Z

496

RESEARCH ARTICLE Open Access Comparative analysis of Klebsiella pneumoniae  

E-Print Network [OSTI]

. Analysis of lipid composition of a defective E. coli strain complemented with pld1 suggests an involvement-spectrum -lactamases and car- bapenemases, such as the recently described NDM-1 [4], multi, extremely or pan

Paris-Sud XI, Université de

497

The Late-Time Radio Spectrum of SN1993J  

E-Print Network [OSTI]

We present VLA radio continuum measurements of SN1993J in M81 at the frequencies of 0.32 (P-band), 1.3 and 1.7 (L-band), 4.9 (C-band), 8.5 (X-band), and 14.9 (U-band) GHz carried out on December 17 and 21, 2000, about 2820 days after the supernova explosion. We find that a power-law spectrum, free-free absorbed by an homogeneous, or clumpy, distribution of ionized gas yields the best fit to the radio data. A combined homogeneous-clumpy model is not favored, but neither totally excluded. This result contrasts with the modeling of the early ($t \\lessim $230 days) radio emission from SN1993J, where a mixture of homogeneous and clumpy absorbers appeared to be necessary to adequately describe the behavior of the light curves. The radio spectrum of supernova SN1993J between 0.32 and 14.9 GHz is well characterized by $\\alpha = -0.67 \\pm 0.02 $ ($S_\

M. A. Perez-Torres; A. Alberdi; J. M. Marcaide

2002-05-14T23:59:59.000Z

498

Warped supersymmetric unification with a nonunified superparticle spectrum  

Science Journals Connector (OSTI)

We present a new supersymmetric extension of the standard model. The model is constructed in warped space, with a unified bulk symmetry broken by boundary conditions on both the Planck and TeV branes. In the supersymmetric limit, the massless spectrum contains exotic colored particles along with the particle content of the minimal supersymmetric standard model (MSSM). Nevertheless, the model still reproduces the MSSM prediction for gauge coupling unification and does not suffer from a proton decay problem. The exotic states acquire masses from supersymmetry breaking, making the model completely viable, but there is still the possibility that these states will be detected at the LHC. The lightest of these states is most likely A5XY, the fifth component of the gauge field associated with the broken unified symmetry. Because supersymmetry is broken on the SU(5)-violating TeV brane, the gaugino masses generated at the TeV scale are completely independent of one another. We explore some of the unusual features that the superparticle spectrum might have as a consequence.

Yasunori Nomura; David Tucker-Smith; Brock Tweedie

2005-04-06T23:59:59.000Z

499

The energy production rate & the generation spectrum of UHECRs  

E-Print Network [OSTI]

We derive simple analytic expressions for the flux and spectrum of ultra-high energy cosmic-rays (UHECRs) predicted in models where the CRs are protons produced by extra-Galactic sources. For a power-law scaling of the CR production rate with redshift and energy, d\\dot{n} /dE\\propto E^-\\alpha (1+z)^m, our results are accurate at high energy, E>10^18.7 eV, to better than 15%, providing a simple and straightforward method for inferring d\\dot{n}/dE from the observed flux at E. We show that current measurements of the UHECR spectrum, including the latest Auger data, imply E^2d\\dot{n}/dE(z=0)=(0.45\\pm0.15)(\\alpha-1) 10^44 erg Mpc^-3 yr^-1 at E<10^19.5 eV with \\alpha roughly confined to 2\\lesseq\\alpha<2.7. The uncertainty is dominated by the systematic and statistic errors in the experimental determination of individual CR event energy, (\\Delta E/E)_{sys}~(\\Delta E/E)_{stat} ~20%. At lower energy, d\\dot{n}/dE is uncertain due to the unknown Galactic contribution. Simple models in which \\alpha\\simeq 2 and the ...

Katz, Boaz; Waxman, Eli

2008-01-01T23:59:59.000Z

500

A simplified approach to characterizing a kilovoltage source spectrum for accurate dose computation  

SciTech Connect (OSTI)

Purpose: To investigate and validate the clinical feasibility of using half-value layer (HVL) and peak tube potential (kVp) for characterizing a kilovoltage (kV) source spectrum for the purpose of computing kV x-ray dose accrued from imaging procedures. To use this approach to characterize a Varian Registered-Sign On-Board Imager Registered-Sign (OBI) source and perform experimental validation of a novel in-house hybrid dose computation algorithm for kV x-rays. Methods: We characterized the spectrum of an imaging kV x-ray source using the HVL and the kVp as the sole beam quality identifiers using third-party freeware Spektr to generate the spectra. We studied the sensitivity of our dose computation algorithm to uncertainties in the beam's HVL and kVp by systematically varying these spectral parameters. To validate our approach experimentally, we characterized the spectrum of a Varian Registered-Sign OBI system by measuring the HVL using a Farmer-type Capintec ion chamber (0.06 cc) in air and compared dose calculations using our computationally validated in-house kV dose calculation code to measured percent depth-dose and transverse dose profiles for 80, 100, and 125 kVp open beams in a homogeneous phantom and a heterogeneous phantom comprising tissue, lung, and bone equivalent materials. Results: The sensitivity analysis of the beam quality parameters (i.e., HVL, kVp, and field size) on dose computation accuracy shows that typical measurement uncertainties in the HVL and kVp ({+-}0.2 mm Al and {+-}2 kVp, respectively) source characterization parameters lead to dose computation errors of less than 2%. Furthermore, for an open beam with no added filtration, HVL variations affect dose computation accuracy by less than 1% for a 125 kVp beam when field size is varied from 5 Multiplication-Sign 5 cm{sup 2} to 40 Multiplication-Sign 40 cm{sup 2}. The central axis depth dose calculations and experimental measurements for the 80, 100, and 125 kVp energies agreed within 2% for the homogeneous and heterogeneous block phantoms, and agreement for the transverse dose profiles was within 6%. Conclusions: The HVL and kVp are sufficient for characterizing a kV x-ray source spectrum for accurate dose computation. As these parameters can be easily and accurately measured, they provide for a clinically feasible approach to characterizing a kV energy spectrum to be used for patient specific x-ray dose computations. Furthermore, these results provide experimental validation of our novel hybrid dose computation algorithm.

Poirier, Yannick; Kouznetsov, Alexei; Tambasco, Mauro [Department of Physics and Astronomy, University of Calgary, Calgary, Alberta T2N 4N2 (Canada); Department of Physics and Astronomy and Department of Oncology, University of Calgary and Tom Baker Cancer Centre, Calgary, Alberta T2N 4N2 (Canada)

2012-06-15T23:59:59.000Z