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1

A retrieval of coastal water constituent concentrations by least-squares inversion of a radiance model  

SciTech Connect (OSTI)

A three-component model of water color including phytoplankton pigment, dissolved organic matter (DOM) and suspended sediments has been developed and applied to coastal waters. A feature of the model is the possibility of varying the parameters describing the spectral backscatter of sediment and the spectral absorption of DOM when inverting the water-leaving radiance model. A linear least-squares technique is used to retrieve optical properties from the water-leaving radiance model. The radiance model is inverted to obtain the optical properties for each set of the parameter values. The set providing the minimum standard error of least squares inversion is taken as the final solution. An analysis of sensitivity of the solution to random radiance measurement errors was carried out. The application of the approach to coastal waters subject to tidal resuspension is discussed.

Vasilkov, A.P. [Management Unit of the Mathematical Models of the North Sea and Scheldt Estuary, Brussels (Belgium)

1997-08-01T23:59:59.000Z

2

Radiance | Department of Energy  

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

have been developing Radiance for 30 years and continue to do so in coordination with Optics, WINDOW, and EnergyPlus development. In recent years, new Radiance developments have...

3

radiance | OpenEI  

Open Energy Info (EERE)

radiance radiance Dataset Summary Description Freedom Field is a not-for-profit organization formed to facilitate development and commercialization of renewable energy solutions. The organization has installed a variety of renewable energy generating technologies at their facility (located at Rock River Water Reclamation in Rockford, IL), with the intention of serving as a demonstration facility. The facility monitors data (at 5-minute intervals) from a weather station, 12.4 kW of PV panels (56 220-watt panels), a 10kW wind turbine (HAWT), a 1.2 kW wind turbine (VAWT), an absorption cooling system, and biogas burners. Source Freedom Field Date Released July 19th, 2011 (3 years ago) Date Updated Unknown Keywords biogas monitoring data PV radiance solar temperature

4

ARM - Measurement - Longwave narrowband radiance  

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

Send Measurement : Longwave narrowband radiance The rate at which radiant energy in the longwave portion of the spectrum is emitted in narrow wavelength bands in a...

5

ARM - Measurement - Shortwave spectral radiance  

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

: Shortwave spectral radiance The rate at which the spectrally resolved radiant energy in the shortwave portion of the spectrum is emitted in a particular direction per unit...

6

ARM - Measurement - Longwave spectral radiance  

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

spectral radiance spectral radiance ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Longwave spectral radiance The rate at which the spectrally resolved radiant energy in the longwave portion of the spectrum is emitted in a particular direction per unit area perpendicular to the direction of radiation. Categories Radiometric Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments AERI : Atmospheric Emitted Radiance Interferometer ASSIST : Atmospheric Sounder Spectrometer for Infrared Spectral

7

Radiance: Synthetic Imaging System | Open Energy Information  

Open Energy Info (EERE)

Radiance: Synthetic Imaging System Radiance: Synthetic Imaging System Jump to: navigation, search Tool Summary Name: RADIANCE Agency/Company /Organization: Lawrence Berkeley National Laboratory Sector: Energy Focus Area: Buildings Resource Type: Software/modeling tools User Interface: Desktop Application Website: radsite.lbl.gov/radiance/ Cost: Free References: Radiance[1] Logo: RADIANCE RADIANCE is a highly accurate ray-tracing software system for UNIX computers that is licensed at no cost in source form. Radiance was developed with primary support from the U.S. Department Of Energy and additional support from the Swiss Federal Government. Radiance is a suite of programs for the analysis and visualization of lighting in design. Input files specify the scene geometry, materials, luminaires,time, date

8

ARM - Measurement - Shortwave narrowband radiance  

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

narrowband radiance narrowband radiance ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Shortwave narrowband radiance A measure of the intrinsic radiant energy flux intensity, at wavelengths between 0.4 and 4 {mu}, emitted by a radiator in a given direction, expressed in units of energy per unit time per unit solid angle. Categories Radiometric Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments CSPHOT : Cimel Sunphotometer SWS : Shortwave Spectroradiometer

9

Radiance Solar | Open Energy Information  

Open Energy Info (EERE)

Radiance Solar Radiance Solar Jump to: navigation, search Name Radiance Solar Place Atlanta, Georgia Zip 30318 Product Commercial and residential PV installer based in Atlanta. Coordinates 33.748315°, -84.391109° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":33.748315,"lon":-84.391109,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

10

Building Energy Software Tools Directory: Radiance  

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

Radiance Radiance Radiance logo. Advanced lighting simulation and rendering package; calculates spectral radiance values (illuminance & color) and spectral irradiance (illuminance & color) for interior and exterior spaces considering electric lighting, daylight and interreflection. Used by architects and designers to predict illumination, visual quality and appearance of design spaces. Used by researchers to evaluate new lighting and daylighting technologies and study visual comfort and similar quantities related to the visual environment. Keywords lighting, daylighting, rendering Validation/Testing N/A Expertise Required High level of computer literacy required; 4 days training, minimum. Users Over 200. Audience Daylighting, lighting, and architectural designers.

11

The Radiance Process: Water and Chemical Free Cleaning  

E-Print Network [OSTI]

Radiance Services Company manages a new technology called the Radiance Process, a dry non-toxic technology for surface cleaning. The Radiance Process received the National Pollution Prevention Roundtable's 1997 Most Valuable Pollution Prevention...

Robison, J. H.

12

The Constant Radiance Term Lszl Neumann 1  

E-Print Network [OSTI]

is zero. The self- 1 Email: neumann@hungary.net #12; L. Neumann: The Constant Radiance Term - 2 information, nor the calculation of form factors. A constant radiance is extracted from the solution in every of the residuum problem is zero. The self-emitting term of the residuum problem can either be positive or negative

13

Posters Residual Analysis of Surface Spectral Radiances Between...  

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

1 Posters Residual Analysis of Surface Spectral Radiances Between Instrument Observations and Line-by-Line Calculations S. A. Clough and P. D. Brown Atmospheric and Environmental...

14

The ARM Atmospheric Emitted Radiance Interferometer (AERI): Status and  

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

The ARM Atmospheric Emitted Radiance Interferometer (AERI): Status and The ARM Atmospheric Emitted Radiance Interferometer (AERI): Status and Preliminary Assessments of Instrument Deployments in 2006 Dedecker, Ralph University of Wisconsin Demirgian, Jack Argonne National Laboratory Knuteson, Robert University Of Wisconsin Revercomb, Henry University of Wisconsin-Madison Tobin, David University of Wisconsin-Madison Turner, David University of Wisconsin-Madison Category: Instruments One of the key operational instruments at the Atmospheric Radiation Measurement Climate Research Facility (ACRF) is the Atmospheric Emitted Radiance Interferometer (AERI). This instrument provides the ARM program with surface-based observations of infrared spectrally resolved radiance from a vertically directed cone with better than 1% accuracy. The data from

15

Acceleration of the matrix multiplication of Radiance three phase  

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

Acceleration of the matrix multiplication of Radiance three phase Acceleration of the matrix multiplication of Radiance three phase daylighting simulations with parallel computing on heterogeneous hardware of personal computer Title Acceleration of the matrix multiplication of Radiance three phase daylighting simulations with parallel computing on heterogeneous hardware of personal computer Publication Type Journal Article LBNL Report Number LBNL-6461E Year of Publication 2013 Authors Zuo, Wangda, Andrew McNeil, Michael Wetter, and Eleanor S. Lee Journal Journal of Building Performance Simulation Keywords daylighting simulation, graphics processing unit, multicore central processing unit, OpenCL, parallel computing Abstract Building designers are increasingly relying on complex fenestration systems to reduce energy consumed for lighting and HVAC in low energy buildings. Radiance, a lighting simulation program, has been used to conduct daylighting simulations for complex fenestration systems. Depending on the configurations, the simulation can take hours or even days using a personal computer. This paper describes how to accelerate the matrix multiplication portion of a Radiance three-phase daylight simulation by conducting parallel computing on heterogeneous hardware of a personal computer. The algorithm was optimized and the computational part was implemented in parallel using OpenCL. The speed of new approach was evaluated using various daylighting simulation cases on a multicore central processing unit and a graphics processing unit. Based on the measurements and analysis of the time usage for the Radiance daylighting simulation, further speedups can be achieved by using fast I/O devices and storing the data in a binary format.

16

FUSE satellite electrical power subsystem  

SciTech Connect (OSTI)

The Far Ultraviolet Spectroscopic Explorer (FUSE) satellite will be placed into a low earth orbit to investigate astrophysical processes related to the formation and development of the early universe. The FUSE satellite is considered a pathfinder for NASA's Mid-Class Explorers (MIDEX). To reduce mission cost and development time while delivering quality science, NASA has enforced strict cost caps with a clear definition of high-level science objectives. As a result, a significant design driver for the electrical power subsystem (EPS) was to minimize cost. The FUSE EPS is a direct energy transfer, unregulated bus architecture, with batteries directly on the bus and solar array power limted by pulse-width-modulated shunt regulators. The power subsystem electronics (PSE) contains circuitry to control battery charging, provide power to the loads, and provide fault protection. The electronics is based on the PSE which Orbital (formerly, Fairchild Space) designed and built for NASA/GSFC's XTE spacecraft. However, the FUSE PSE design incorporates a number of unique features to meet the mission requirements. To minimize size of the solar panels due to stowed attachment constraints, GaAs/Ge solar cells were selected. This is the first time this type of large area, thinned solar cell with integral bypass diodes are being used for a NASA LEO mission. The solar panels support a satellite load power of 520W. Nickel Cadmium (NiCd) batteries are used which are identical to the RADARSAT-I design, except for different temperature sensors. This is the first mission for which Orbital is using SAFT NiCd batteries. The spacecraft bus, including the EPS, has successfully completed environmental testing and has been delivered for instrument integration. Tradeoffs involved in designing the EPS and selecting components based on the requirements are discussed. Analyses including solar array and battery sizing and energy balance are presented in addition to results from testing the flight hardware.

Roufberg, L.; Noah, K.

1998-07-01T23:59:59.000Z

17

Maintenance cost studies of present aircraft subsystems  

E-Print Network [OSTI]

This report describes two detailed studies of actual maintenance costs for present transport aircraft. The first part describes maintenance costs for jet transport aircraft broken down into subsystem costs according to an ...

Pearlman, Chaim Herman Shalom

1966-01-01T23:59:59.000Z

18

Fuel Cell Subsystems and Components | Department of Energy  

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

Fuel Cell Subsystems and Components Fuel Cell Subsystems and Components As recommended by the 2004 National Research Council report, the program continues to increase its support...

19

Time series analysis of AERI radiances for GCM testing and improvement  

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

Time series analysis of AERI radiances for GCM testing and improvement Time series analysis of AERI radiances for GCM testing and improvement Dykema, John Harvard University Leroy, Stephen Harvard University Anderson, James Harvard University Tobin, David University of Wisconsin-Madison Knuteson, Robert University Of Wisconsin Revercomb, Henry University of Wisconsin-Madison Category: Radiation High resolution infrared radiances measured by the Atmospheric Emitted Radiance Interferometer (AERI) contained detailed information about the structure and dynamics of temperature, water vapor, and clouds below 3 km. Infrared radiances also contain the signature of radiative forcing by well-mixed gases that constitutes the greenhouse effect. Direct comparison of these radiance observations to similar radiances calculated from output

20

CIMEL Measurements of Zenith Radiances at the ARM SGP Site  

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

CIMEL Measurements of Zenith Radiances CIMEL Measurements of Zenith Radiances at the ARM SGP Site W. J. Wiscombe National Aeronautics and Space Administration Goddard Space Flight Center Climate and Radiation Branch Greenbelt, Maryland A. Marshak and K. Evans Joint Center for Earth Systems Technology University of Maryland Baltimore, Maryland Y. Knyazikhin Department of Geography Boston University Boston, Massachusetts H. W. Barker Environment Canada Downsview, Ontario, Canada C. F. Pavloski Department of Meteorology Pennsylvania State University University Park, Pennsylvania A. B. Davis Los Alamos National Laboratory Space and Remote Sensing Sciences Los Alamos, New Mexico M. Miller Brookhaven National Laboratory Upton, New York Introduction The objective of our study is to exploit the sharp spectral contrast in vegetated surface reflectance across

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Posters Atmospheric Emitted Radiance Interferometer Data Analysis Methods  

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

Posters Atmospheric Emitted Radiance Interferometer Data Analysis Methods R. O. Knuteson, W. L. Smith, S. A. Ackerman, H. E. Revercomb, H. Woolf, and H. Howell Cooperative Institute for Meteorological Satellite Studies University of Wisconsin-Madison Madison, Wisconsin Introduction Data from the Atmospheric Emitted Radiance Inter- ferometer (AERI) have been analyzed for the Atmospheric Radiation Measurement (ARM) Program's Fourier Transform Data Analysis Tools science team project under the direction of William L. Smith of the University of Wisconsin-Madison. The data consist of observations of the downwelling infrared emission at the surface from gaseous atmospheric constituents and from cloud and particulate aerosols. The observations are at 0.5 cm-1 spectral resolution over the

22

International Satellite Cloud Climatology Project (ISCCP) Radiance Calibration Report  

E-Print Network [OSTI]

This document describes the radiance calibrations used for all ISCCP Stage B3 data for the period July 1983 through June 1991 (Schiffer and Rossow 1985; Rossow et al. 1987; Brest and Rossow 1992; Desormeaux et al. 1992). Calibration is reported in three stages, called nominal, normalized and absolute. Equations and tables in the following sections define each of these calibrations. 1.1. NOMINAL CALIBRATION The nominal calibration (first set of tables on Stage B3 data tapes) represents the best information available at the start of processing of data from a particular satellite, usually the pre-launch calibration supplied by the satellite operator for the visible (VIS) channel (and other channels at solar wavelengths) and an equation or table used to interpret on-board calibration information for the infrared (IR) channel (and other channels at thermal infrared wavelengths). Specific details are given for each satellite in sections to follow. In this document, VIS radiances are given as "scaled radiances", L

William Rossow; Yves Desormeaux; Christopher L. Brest; Alison Walker

1992-01-01T23:59:59.000Z

23

Three Main Subsystems: I. Centerpiece (Linear Actuation)  

E-Print Network [OSTI]

Systems Two Main Subsystems: I. Solar Panels Four 100 W high efficiency solar panels were installed symmetrically atop the canopy. The panels were wired in parallel to a deep cycle solar battery. In full sunlight- Monocrystalline-Solar-Panel-4-Pack-GS-S-250- Fab5x4/202960000?N=8p9Z5yc1v Left Bottom: Wind Blue Power LLC. (2014

Provancher, William

24

Automated searching for quantum subsystem codes  

E-Print Network [OSTI]

Quantum error correction allows for faulty quantum systems to behave in an effectively error free manner. One important class of techniques for quantum error correction is the class of quantum subsystem codes, which are relevant both to active quantum error correcting schemes as well as to the design of self-correcting quantum memories. Previous approaches for investigating these codes have focused on applying theoretical analysis to look for interesting codes and to investigate their properties. In this paper we present an alternative approach that uses computational analysis to accomplish the same goals. Specifically, we present an algorithm that computes the optimal quantum subsystem code that can be implemented given an arbitrary set of measurement operators that are tensor products of Pauli operators. We then demonstrate the utility of this algorithm by performing a systematic investigation of the quantum subsystem codes that exist in the setting where the interactions are limited to 2-body interactions between neighbors on lattices derived from the convex uniform tilings of the plane.

Gregory M. Crosswhite; Dave Bacon

2010-09-11T23:59:59.000Z

25

Subsystem codes with spatially local generators  

Science Journals Connector (OSTI)

We study subsystem codes whose gauge group has local generators in two-dimensional (2D) geometry. It is shown that there exists a family of such codes defined on lattices of size LL with the number of logical qubits k and the minimum distance d both proportional to L. The gauge group of these codes involves only two-qubit generators of type XX and ZZ coupling nearest-neighbor qubits (and some auxiliary one-qubit generators). Our proof is not constructive as it relies on a certain version of the Gilbert-Varshamov bound for classical codes. Along the way, we introduce and study properties of generalized Bacon-Shor codes that might be of independent interest. Secondly, we prove that any 2D subsystem [n,k,d] code with spatially local generators obeys upper bounds kd=O(n) and d2=O(n). The analogous upper bound proved recently for 2D stabilizer codes is kd2=O(n). Our results thus demonstrate that subsystem codes can be more powerful than stabilizer codes under the spatial locality constraint.

Sergey Bravyi

2011-01-26T23:59:59.000Z

26

Space-reactor electric systems: subsystem technology assessment  

SciTech Connect (OSTI)

This report documents the subsystem technology assessment. For the purpose of this report, five subsystems were defined for a space reactor electric system, and the report is organized around these subsystems: reactor; shielding; primary heat transport; power conversion and processing; and heat rejection. The purpose of the assessment was to determine the current technology status and the technology potentials for different types of the five subsystems. The cost and schedule needed to develop these potentials were estimated, and sets of development-compatible subsystems were identified.

Anderson, R.V.; Bost, D.; Determan, W.R.

1983-03-29T23:59:59.000Z

27

Remote sensing of Greenland ice sheet using multispectral near-infrared and visible radiances  

E-Print Network [OSTI]

Remote sensing of Greenland ice sheet using multispectral near-infrared and visible radiances Petr remote-sensing algorithm that utilizes reflected visible and near-infrared radiation to discriminate using multispectral near-infrared and visible radiances, J. Geophys. Res., 112, D24S20, doi:10

Dozier, Jeff

28

Radiance: Science and Stagecraft Come Together via Alan Alda and Marie  

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

Radiance: Science and Stagecraft Come Together via Alan Alda and Radiance: Science and Stagecraft Come Together via Alan Alda and Marie Curie Radiance: Science and Stagecraft Come Together via Alan Alda and Marie Curie May 27, 2011 - 1:30pm Addthis Alan Alda | Photo Courtesy of www.alanalda.com Alan Alda | Photo Courtesy of www.alanalda.com Charles Rousseaux Charles Rousseaux Senior Writer, Office of Science They might appear to have little in common. She received two Nobel Prizes. He won six Emmys. She was born in Poland and made her name in Paris. He was born in New York City, and made his fame in Hollywood. Despite their differences, Marie Curie and Alan Alda will be coming together on opening night of the upcoming World Science Festival, through a special reading of his first play, Radiance: The Passion of Marie Curie.

29

Radiance: Science and Stagecraft Come Together via Alan Alda and Marie  

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

Radiance: Science and Stagecraft Come Together via Alan Alda and Radiance: Science and Stagecraft Come Together via Alan Alda and Marie Curie Radiance: Science and Stagecraft Come Together via Alan Alda and Marie Curie May 27, 2011 - 1:30pm Addthis Alan Alda | Photo Courtesy of www.alanalda.com Alan Alda | Photo Courtesy of www.alanalda.com Charles Rousseaux Charles Rousseaux Senior Writer, Office of Science They might appear to have little in common. She received two Nobel Prizes. He won six Emmys. She was born in Poland and made her name in Paris. He was born in New York City, and made his fame in Hollywood. Despite their differences, Marie Curie and Alan Alda will be coming together on opening night of the upcoming World Science Festival, through a special reading of his first play, Radiance: The Passion of Marie Curie.

30

CIMEL SUN PHOTOMETERS: UPDATES ON NEW DEPLOYMENTS AND CLOUD MODE ZENITH RADIANCE DATA  

E-Print Network [OSTI]

CIMEL SUN PHOTOMETERS: UPDATES ON NEW DEPLOYMENTS AND CLOUD MODE ZENITH RADIANCE DATA Richard of Science ABSTRACT Since March 1998, ARM has deployed Cimel Sun PHOTometers (CSPHOT) at several but not all

31

On subsystem codes beating the quantum Hamming or Singleton bound  

Science Journals Connector (OSTI)

...One of the open problems suggested by Poulin's work asks whether a subsystem code...subsystems (Kribs et al. 2005, 2006; Poulin 2005; Bacon 2006; Knill 2006; Kribs...can be converted to a stabilizer code (Poulin 2005; Kribs et al. 2006). See also...

2007-01-01T23:59:59.000Z

32

Exotic normal fusion subsystems of general linear groups  

Science Journals Connector (OSTI)

......saturated fusion subsystem of index prime to p in (Sn...qe ) up to p-completion, where [n/e] is...saturated fusion subsystem of index prime to p in CFn,q...n/e] pl ) is an index r subgroup of AutCFn...qe ) up to p-completion. Proof. We proceed......

Albert Ruiz

2007-08-01T23:59:59.000Z

33

ACCELERATION OF RADIANCE FOR LIGHTING SIMULATION BY USING PARALLEL COMPUTING WITH OPENCL  

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

ACCELERATION OF RADIANCE FOR LIGHTING SIMULATION BY USING ACCELERATION OF RADIANCE FOR LIGHTING SIMULATION BY USING PARALLEL COMPUTING WITH OPENCL Wangda Zuo, Andrew McNeil, Michael Wetter, Eleanor Lee Building Technologies Department, Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA ABSTRACT We report on the acceleration of annual daylighting simulations for fenestration systems in the Radiance ray-tracing program. The algorithm was optimized to reduce both the redundant data input/output operations and the floating-point operations. To further accelerate the simulation speed, the calculation for matrix multiplications was implemented using parallel computing on a graphics processing unit. We used OpenCL, which is a cross- platform parallel programming language. Numerical

34

The Advanced Composition Explorer power subsystem  

SciTech Connect (OSTI)

The Johns Hopkins University Applied Physics Laboratory, under contract with NASA Goddard Space Flight Center, has designed and launched the Advanced Composition Explorer (ACE) spacecraft. ACE is a scientific observatory housing ten instruments, and is located in a halo orbit about the L1 Sun-Earth libration point. ACE is providing real-time solar wind monitoring and data on elemental and isotopic matter of solar and galactic origin. The ACE Electrical Power Subsystem (EPS) is a fault tolerant, solar powered, shunt regulated, direct energy transfer architecture based on the Midcourse Space Experiment (MSX) EPS. The differences are that MSX used oriented solar arrays with a nickel hydrogen-battery defined bus, while ACE uses fixed solar panels with a regulated bus decoupled from its nickel cadmium (NiCd) battery. Also, magnetometer booms are mounted on two of the four ACE solar panels. The required accuracy of the magnetometers impose severe requirements on the magnetic fields induced by the solar array. Other noteworthy features include a solar cell degradation experiment, in-flight battery reconditioning, a battery requalified to a high vibrational environment, and an adjustable bus voltage setpoint. The four solar panels consist of aluminum honeycomb substrates covered with 15.1% efficient silicon cells. The cells are strung using silver interconnects and are back-wired to reduce magnetic emissions below 0.1nT. Pyrotechnic actuated, spring loaded hinges deploy the panels after spacecraft separation from the Delta II launch vehicle. Solar cell experiments on two of the panels track cell performance degradation at L1, and also distinguish any hydrazine impingement degradation which may be caused by the thrusters. Each solar panel uses a digital shunt box, containing blocking diodes and MOSFETs, for short-circuit control of its 5 solar strings. A power box contains redundant analog MOSFET shunts, the 90% efficient boost regulator, and redundant battery chargers which provide closed-loop voltage and current limiting. The booster can also be configured in flight to cause a regulated 0.6A discharge to provide partial battery reconditioning. The battery uses 18 spare 12Ah NiCd cells from the retired constellation of Navy navigation satellites. The battery unintentionally received twice the intended amplitude during vibration testing, but a packaging review and cell requalification proved the battery capable of safely operating in the more rugged environment. The control box contains redundant hybrid switching converters, shunt regulation electronics, and a circuit to switch sides in response to bus under or over-voltage. The control box also contains redundant 80C85RH-based processors which digitize all EPS telemetry and decode digital commands communicated over cross-strapped serial links with the redundant spacecraft command and data handling systems.

Panneton, P.E.; Tarr, J.E.; Goliaszewski, L.T.

1998-07-01T23:59:59.000Z

35

Central Receiver Plant evaluation: (2) THEMIS collector subsystem evaluation  

SciTech Connect (OSTI)

This report is part of the evaluation work carried out at Ecole Centrale on central receiver plants. The THEMIS collector subsystem is evaluated with emphasis given to the energy performance problems. The collector subsystem, the heliostat, and the operation modes are described. The mechanisms which contribute to the energy losses of the collector subsystem are discussed individually. Heliostat availability, reflectivity, geometrical effects (mirror shadowing and blocking, cosine factor, tower shadowing), beam focusing quality, beam pointing, spillage, propagation losses in the atmosphere between the mirrors and the receiver are successively evaluated. The overall collector efficiency is then estimated from two different points of view. The theoretical performance showing the physical limitation of the system, and the actual performance based on real experimental results, are separately discussed. The electricity consumption of the heliostat field is examined for plant parasitics analysis. The maintenance problems and the lessons learned on hardware behavior at the THEMIS site are also discussed. 19 refs., 7 figs.; 24 tabs.

Amri, A.; Izygon, M.; Tedjiza, B.

1988-01-01T23:59:59.000Z

36

Solar Energy, 2006, 80, 3, 361-367 SIMULATING METEOSAT-7 BROADBAND RADIANCES USING TWO  

E-Print Network [OSTI]

Solar Energy, 2006, 80, 3, 361-367 SIMULATING METEOSAT-7 BROADBAND RADIANCES USING TWO VISIBLE-00361360,version1-13Feb2009 Author manuscript, published in "Solar Energy 80, 3 (2006) 361-367" DOI : 10.1016/j.solener.2005.01.012 #12;Solar Energy, 2006, 80, 3, 361-367 · Imet-7 the maximum irradiance

Paris-Sud XI, Université de

37

Bioluminescence in a complex coastal environment: 1. Temporal dynamics of nighttime water-leaving radiance  

E-Print Network [OSTI]

in intensity and spectral quality of water-leaving radiance provide suitable ranges for assessing detection light, which often leads to brilliant displays in the wakes of ships, in breaking waves, or even around method (as opposed to active methods such as RADAR or LIDAR) of identifying hostile ships, submarines

Moline, Mark

38

Deployment of the Polar Atmospheric Emitted Radiance Interferometer (P-AERI) in Eureka, Canada for SEARCH  

E-Print Network [OSTI]

Deployment of the Polar Atmospheric Emitted Radiance Interferometer (P-AERI) in Eureka, Canada operate in the polar darkness when solar transmission instruments are not useful. The University of Idaho's P-AERI instrument was deployed in Eureka, Canada in March 2006. It has been operating nearly

Walden, Von P.

39

Posters Atmospheric Emitted Radiance Interferometer: Status and Water Vapor Continuum Results  

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

9 9 Posters Atmospheric Emitted Radiance Interferometer: Status and Water Vapor Continuum Results H. E. Revercomb, R. O. Knuteson, W. L. Smith, F. A. Best, and R. G. Dedecker University of Wisconsin Madison, Wisconsin H. B. Howell National Oceanic and Atmospheric Administration Systems Design and Applications Branch Madison, Wisconsin Introduction Accurate and spectrally detailed observations of the thermal emission from radiatively important atmospheric gases, aerosols, and clouds are now being provided to the Atmospheric Radiation Measurement (ARM) data base by the Atmospheric Emitted Radiance Interferometer (AERI) prototype at the Southern Great Plains Cloud and Radiation Testbed (CART) site. Spectra over the range from 520 to 3000 cm -1 (3 to 19 microns) with a resolution of 0.5 cm

40

Simultaneous measurements of super-radiance at multiple wavelengths from helium excited states: (I) Experiment  

E-Print Network [OSTI]

In this paper, we report the results of measurements of the intensities and delays of super-radiance decays from excited helium atoms at multiple wavelengths. The experiment was performed using extreme ultraviolet radiation produced by the free electron laser at the SPring-8 Compact SASE Source test accelerator facility as an excitation source. We observed super-radiant transitions on the $1s3p \\to 1s2s$ ($\\lambda=$502 nm), $1s3d \\to 1s2p$ ($\\lambda=$668 nm), and $1s3s \\to 1s2p$ ($\\lambda=$728 nm) transitions. The pulse energy of each transition and its delay time were measured as a function of the target helium gas density. Several interesting features of the data, some of which appear to contradict with the predictions of the simple two-level super-radiance theory, are pointed out.

Nakajima, Kyo; Iwayama, Hiroshi; Kuma, Susumu; Miyamoto, Yuki; Nagasono, Mitsuru; Ohae, Chiaki; Togashi, Tadashi; Yabashi, Makina; Shigemasa, Eiji; Sasao, Noboru

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

OTEC Cold Water Pipe-Platform Sub-System Dynamic Interaction...  

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

OTEC Cold Water Pipe-Platform Sub-System Dynamic Interaction Validation (OPPSDIV) OTEC Cold Water Pipe-Platform Sub-System Dynamic Interaction Validation (OPPSDIV) OTEC Cold Water...

42

Subsystem real-time Time Dependent Density Functional Theory  

E-Print Network [OSTI]

We present the extension of Frozen Density Embedding (FDE) theory to real-time Time Dependent Density Functional Theory (rt-TDDFT). FDE a is DFT-in-DFT embedding method that allows to partition a larger Kohn-Sham system into a set of smaller, coupled Kohn-Sham systems. Additional to the computational advantage, FDE provides physical insight into the properties of embedded systems and the coupling interactions between them. The extension to rt-TDDFT is done straightforwardly by evolving the Kohn-Sham subsystems in time simultaneously, while updating the embedding potential between the systems at every time step. Two main applications are presented: the explicit excitation energy transfer in real time between subsystems is demonstrated for the case of the Na$_4$ cluster and the effect of the embedding on optical spectra of coupled chromophores. In particular, the importance of including the full dynamic response in the embedding potential is demonstrated.

Krishtal, Alisa; Pavanello, Michele

2015-01-01T23:59:59.000Z

43

10 MWe solar thermal central receiver pilot plant. Collector subsystem functional test plan  

SciTech Connect (OSTI)

This Phase II Collector Subsystem Functional Test Plan presents the functional testing to be performed to demonstrate the readiness of the Collector Subsystem for the Integrated Acceptance Tests. The functional testing will be performed with the collector subsystem as a stand-alone subsystem. In this context, all heliostat operational commands will be issued from the Heliostat Array Controller (HAC) and heliostat responses will be verified by visual means and from the HAC status displays.

Not Available

1981-11-17T23:59:59.000Z

44

Radioisotope thermoelectric generator transportation system subsystem 143 software development plan  

SciTech Connect (OSTI)

This plan describes the activities to be performed and the controls to be applied to the process of specifying, developing, and qualifying the data acquisition software for the Radioisotope Thermoelectric Generator (RTG) Transportation System Subsystem 143 Instrumentation and Data Acquisition System (IDAS). This plan will serve as a software quality assurance plan, a verification and validation (V and V) plan, and a configuration management plan.

King, D.A.

1994-11-10T23:59:59.000Z

45

Maps and inverse maps in open quantum dynamics  

SciTech Connect (OSTI)

Two kinds of maps that describe evolution of states of a subsystem coming from dynamics described by a unitary operator for a larger system, maps defined for fixed mean values and maps defined for fixed correlations, are found to be quite different for the same unitary dynamics in the same situation in the larger system. An affine form is used for both kinds of maps to find necessary and sufficient conditions for inverse maps. All the different maps with the same homogeneous part in their affine forms have inverses if and only if the homogeneous part does. Some of these maps are completely positive; others are not, but the homogeneous part is always completely positive. The conditions for an inverse are the same for maps that are not completely positive as for maps that are. For maps defined for fixed mean values, the homogeneous part depends only on the unitary operator for the dynamics of the larger system, not on any state or mean values or correlations. Necessary and sufficient conditions for an inverse are stated several different ways: in terms of the maps of matrices, basis matrices, density matrices, or mean values. The inverse maps are generally not tied to the dynamics the way the maps forward are. A trace-preserving completely positive map that is unital cannot have an inverse that is obtained from any dynamics described by any unitary operator for any states of a larger system.

Jordan, Thomas F., E-mail: tjordan@d.umn.ed [Physics Department, University of Minnesota, Duluth, MN 55812 (United States)

2010-10-15T23:59:59.000Z

46

Maps and inverse maps in open quantum dynamics  

E-Print Network [OSTI]

Two kinds of maps that describe evolution of states of a subsystem coming from dynamics described by a unitary operator for a larger system, maps defined for fixed mean values and maps defined for fixed correlations, are found to be quite different for the same unitary dynamics in the same situation in the larger system. An affine form is used for both kinds of maps to find necessary and sufficient conditions for inverse maps. All the different maps with the same homogeneous part in their affine forms have inverses if and only if the homogeneous part does. Some of these maps are completely positive; others are not, but the homogeneous part is always completely positive. The conditions for an inverse are the same for maps that are not completely positive as for maps that are. For maps defined for fixed mean values, the homogeneous part depends only on the unitary operator for the dynamics of the larger system, not on any state or mean values or correlations. Necessary and sufficient conditions for an inverse are stated several different ways: in terms of the maps of matrices, basis matrices, density matrices, or mean values. The inverse maps are generally not tied to the dynamics the way the maps forward are. A trace-preserving completely positive map that is unital can not have an inverse that is obtained from any dynamics described by any unitary operator for any states of a larger system.

Thomas F. Jordan

2008-07-08T23:59:59.000Z

47

Simulating the Daylight Performance of Complex Fenestration Systems Using Bidirectional Scattering Distribution Functions within Radiance  

SciTech Connect (OSTI)

We describe two methods which rely on bidirectional scattering distribution functions (BSDFs) to model the daylighting performance of complex fenestration systems (CFS), enabling greater flexibility and accuracy in evaluating arbitrary assemblies of glazing, shading, and other optically-complex coplanar window systems. Two tools within Radiance enable a) efficient annual performance evaluations of CFS, and b) accurate renderings of CFS despite the loss of spatial resolution associated with low-resolution BSDF datasets for inhomogeneous systems. Validation, accuracy, and limitations of the methods are discussed.

Ward, Gregory; Mistrick, Ph.D., Richard; Lee, Eleanor; McNeil, Andrew; Jonsson, Ph.D., Jacob

2011-01-21T23:59:59.000Z

48

Acceleration of the matrix multiplication of Radiance three phase daylighting simulations with parallel computing on heterogeneous hardware of personal computer  

SciTech Connect (OSTI)

Building designers are increasingly relying on complex fenestration systems to reduce energy consumed for lighting and HVAC in low energy buildings. Radiance, a lighting simulation program, has been used to conduct daylighting simulations for complex fenestration systems. Depending on the configurations, the simulation can take hours or even days using a personal computer. This paper describes how to accelerate the matrix multiplication portion of a Radiance three-phase daylight simulation by conducting parallel computing on heterogeneous hardware of a personal computer. The algorithm was optimized and the computational part was implemented in parallel using OpenCL. The speed of new approach was evaluated using various daylighting simulation cases on a multicore central processing unit and a graphics processing unit. Based on the measurements and analysis of the time usage for the Radiance daylighting simulation, further speedups can be achieved by using fast I/O devices and storing the data in a binary format.

University of Miami; Zuo, Wangda; McNeil, Andrew; Wetter, Michael; Lee, Eleanor S.

2013-04-30T23:59:59.000Z

49

Final Report: High Spectral Resolution Atmospheric Emitted Radiance Studies with the ARM UAV  

SciTech Connect (OSTI)

The active participation in the Atmospheric Radiation Measurement (ARM) Unmanned Airborne Vehicle (UAV) science team that was anticipated in the grant proposal was indefinitely delayed after the first year due to a programmatic decision to exclude the high spectral resolution observations from the existing ARM UAV program. However, this report shows that substantial progress toward the science objectives of this grant have made with the help of separate funding from NASA and other agencies. In the four year grant period (including time extensions), a new high spectral resolution instrument has been flown and has successfully demonstrated the ability to obtain measurements of the type needed in the conduct of this grant. In the near term, the third water vapor intensive observing period (WVIOP-3) in October 2000 will provide an opportunity to bring the high spectral resolution observations of upwelling radiance into the ARM program to complement the downwelling radiance observations from the existing ARM AERI instruments. We look forward to a time when the ARM-UAV program is able to extend its scope to include the capability for making these high spectral resolution measurements from a UAV platform.

Revercomb, Henry E.

1999-12-31T23:59:59.000Z

50

Release Path Temperatures of Shock-Compressed Tin from Dynamic Reflectance and Radiance Measurements  

SciTech Connect (OSTI)

Dynamic reflectance and radiance measurements were conducted for tin samples shock compressed to 35 GPa and released to 15 GPa using high explosives. We determined the reflectance of the tin samples glued to lithium fluoride windows using an integrating sphere with an internal xenon flashlamp as an illumination source. The dynamic reflectance (R) was determined at near normal incidence in four spectral bands with coverage in visible and near-infrared spectra. Uncertainties in R/R0 are < 2%, and uncertainties in absolute reflectance are < 5%. In complementary experiments, thermal radiance from the tin/glue/lithium fluoride interface was recorded with similar shock stress and spectral coverage as the reflectance measurements. The two sets of experiments were combined to obtain the temperature history of the tin surface with an uncertainty of < 2%. The stress at the interface was determined from photonic Doppler velocimetry and combined with the temperatures to obtain temperature-stress release paths for tin. We discuss the relationship between the experimental release paths and release isentropes that begin on the principal shock Hugoniot.

La Lone, B. M. [NSTec; Stevens, G. D. [NSTec; Turley, W. D. [NSTec; Holtkamp, D. B. [LANL; Iverson, A. J. [NSTec; Hixson, R. S. [NSTec; Veeser, L. R. [NSTec

2013-08-01T23:59:59.000Z

51

REDSHIFTS, WIDTHS, AND RADIANCES OF SPECTRAL LINES EMITTED BY THE SOLAR TRANSITION REGION  

SciTech Connect (OSTI)

A long-standing problem in understanding the physics of the transition region has been the ubiquitous redshifts of transition region ultraviolet spectral lines relative to chromospheric emission lines, a result known since the Skylab era. Extended spectral scans performed for various regions of the solar disk by the Solar Ultraviolet Measurements of Emitted Radiation spectrometer on the Solar and Heliospheric Observatory contain thousands of line profiles per study and allow a thorough investigation of the redshift phenomenon. In using these data from seven distinct disk areas made in lines spanning the chromosphere to coronal temperature range, we derive a relationship between Doppler wavelength shifts and radiances and a relationship between line widths and radiances. While chromospheric and coronal lines emitted by very bright plasmas may in some cases show pronounced redshifts, transition-region lines predominantly show redshifts everywhere in the quiet Sun and in active regions. In coronal holes, however, they display a reduced shift, which at times altogether disappears. The observations and the findings will be described, and possible explanations will be considered.

Feldman, U. [Artep Inc. 2922 Excelsior Spring Circle, Ellicott City, Columbia, MD 21042 (United States); Dammasch, I. E. [Solar Influences Data Analysis Center, Royal Observatory of Belgium, Circular Avenue 3, 1180 Uccle, Brussels (Belgium); Doschek, G. A. [Space Science Division, Naval Research Laboratory, Washington, DC (United States)

2011-12-20T23:59:59.000Z

52

Some special sub-systems for stratospheric balloon flights in India  

Science Journals Connector (OSTI)

During last few years several new sub-systems for balloon were developed and are being regularly used in the balloon flights. Some of these sub-systems are i) positive monitor for magnetic ballast release using an opto-electronic device ii) one-way pressure switch to terminate flight for runaway balloon iii) in-flight payload reel down system for atmospheric science experiment. The design, usage and performance of these and other sub-systems will be presented.

S.V. Damle; G.S. Gokhale; R.U. Kundapurkar

1987-01-01T23:59:59.000Z

53

Multi-terminal Subsystem Model Validation for Pacific DC Intertie  

SciTech Connect (OSTI)

this paper proposes to validate dynamic model of Pacific DC Intertie with the concept of hybrid simulation by combing simulation with PMU measurements. The Playback function available in GE PSLF is adopted for hybrid simulation. It is demonstrated for the first time the feasibility of using Playback function on multi-terminal subsystem. Sensitivity studies are also presented as a result of common PMU measurement quality problem, ie, offset noise and time synchronization. Results indicate a good tolerance of PDCI model generally. It is recommended that requirements should apply to phasor measurements in model validation work to ensure better analysis. Key parameters are identified based on impact of value change to model behavior. Two events are employed for preliminary model validation with PMU measurements. Suggestions are made for PDCI model validation work in the future.

Yang, Bo; Huang, Zhenyu; Kosterev, Dmitry

2008-07-20T23:59:59.000Z

54

Inverse Energy Transfer  

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

which is unstable. It saturates by transfer to a separate, damped eigenmode (i.e., a subcritical spectrum of damped waves). Inverse energy transfer is carried by three-wave...

55

A comparison of cloud top heights computed from airborne lidar and MAS radiance data using CO2 slicing  

E-Print Network [OSTI]

A comparison of cloud top heights computed from airborne lidar and MAS radiance data using CO2 in assessing the accuracy of the CO2-slicing cloud height algorithm. Infrared measurements of upwelling which included various single- layer and multilayer cloud conditions. Overall, the CO2-slicing method

Sheridan, Jennifer

56

Improved ARM-SGP TOA OLR Fluxes from GOES-8 IR Radiances Based on CERES Data  

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

ARM-SGP TOA OLR Fluxes from GOES-8 IR ARM-SGP TOA OLR Fluxes from GOES-8 IR Radiances Based on CERES Data D. R. Doelling and M. M. Khaiyer Analytical Services and Materials, Inc. Hampton, Virginia P. Minnis National Aeronautics and Space Administration Langley Research Center Hampton, Virginia Introduction The radiation budget at the top of the atmosphere (TOA) is a quantity of fundamental importance to the Atmospheric Radiation Measurement (ARM) Program. Thus, it is necessary to measure the radiation budget components, broadband shortwave albedo and outgoing longwave radiation (OLR), as accurately as possible. Measurement of OLR over the ARM surface sites has only been possible since the advent of Clouds and the Earth's Radiant Energy System (CERES; Wielicki et al. 1998) in 1998. Prior to

57

A nanoflare model for active region radiance: application of artificial neural networks  

E-Print Network [OSTI]

Context. Nanoflares are small impulsive bursts of energy that blend with and possibly make up much of the solar background emission. Determining their frequency and energy input is central to understanding the heating of the solar corona. One method is to extrapolate the energy frequency distribution of larger individually observed flares to lower energies. Only if the power law exponent is greater than 2, is it considered possible that nanoflares contribute significantly to the energy input. Aims. Time sequences of ultraviolet line radiances observed in the corona of an active region are modelled with the aim of determining the power law exponent of the nanoflare energy distribution. Methods. A simple nanoflare model based on three key parameters (the flare rate, the flare duration time, and the power law exponent of the flare energy frequency distribution) is used to simulate emission line radiances from the ions Fe XIX, Ca XIII, and Si iii, observed by SUMER in the corona of an active region as it rotates around the east limb of the Sun. Light curve pattern recognition by an Artificial Neural Network (ANN) scheme is used to determine the values. Results. The power law exponents, alpha 2.8, 2.8, and 2.6 for Fe XIX, Ca XIII, and Si iii respectively. Conclusions. The light curve simulations imply a power law exponent greater than the critical value of 2 for all ion species. This implies that if the energy of flare-like events is extrapolated to low energies, nanoflares could provide a significant contribution to the heating of active region coronae.

M. Bazarghan; H. Safari; D. E. Innes; E. Karami; S. K. Solanki

2008-08-28T23:59:59.000Z

58

Subsystem Interaction Analysis in Power Distribution Systems of Next Generation Airlifters  

E-Print Network [OSTI]

1 Subsystem Interaction Analysis in Power Distribution Systems of Next Generation Airlifters Sriram power distribution system of a next generation transport aircraft is addressed. Detailed analysis with the analysis of subsystem integration in power distribution systems of next generation transport aircraft

Lindner, Douglas K.

59

Memory effect and temperature behavior in spin valves with and without antiferromagnetic subsystems  

E-Print Network [OSTI]

Memory effect and temperature behavior in spin valves with and without antiferromagnetic subsystems Temperature behavior and memory effect in standard spin valves SV and SVs with synthetic antiferromagnetic Co/Ru/Co SV-SAF subsystems have been studied. SV-SAFs show much better temperature stability. Memory effect

Xiao, John Q.

60

Surface Micromachined Components for a Safety Subsystem Application  

SciTech Connect (OSTI)

We have designed and fabricated a system using micromachining technologies that represents the first phase of an effort to develop a miniaturized or micro trajectory safety subsystem. Two Surface Micromachined (SMM) devices have been fabricated. The first is a device, denoted the Shuttle Mechanism, that contains a suspended shuttle that has a unique code imbedded in its surface. The second is a mechanical locking mechanism, denoted a Stronglink, that uses the code imbedded in the Shuttle Mechanism for unlocking. The Stronglink is designed to block a beam of optical energy until unlocked. A Photonic Integrated Circuit (PIC) fabricated in Gallium Arsenide (GaAs) and an ASIC have been designed to read the code contained in the Shuttle Mechanism. The ASIC interprets the data read by the PIC and outputs low-level drive signals for the actuators used by the Stronglink. An off-chip circuit amplifies the drive signals. Once the Stronglink is unlocked, a laser array that is assembled beneath the device is energized and light is transmitted through an aperture.

Garcia, E.J.; Holswade, S.; Plummer, D.W.; Polosky, M.A.; Shul, R.J.; Sulivan, C.T.

1999-03-04T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

The Inverse Ising Problem  

Science Journals Connector (OSTI)

Abstract The inverse Ising problem consists of taking a set of Ising configurations generated with unknown interaction parameters, and deter- mining reliable estimates for the values of those interaction parameters. The problem first arose in connection with the Monte Carlo renormalization group, and was solved thirty years ago. Recently, there has been renewed interest in the inverse Ising problem due to biological applications. The original solution seems to have been forgotten, as it was rediscovered in a different representation by Aurell and Ekeberg in 2012. In this paper we modify the earlier equations to solve problems that are not translationally invariant.

Joseph Albert; Robert H. Swendsen

2014-01-01T23:59:59.000Z

62

Evaluating Water Vapor in the NCAR CAM3 Climate Model with RRTMG/McICA using Modeled and Observed AIRS Spectral Radiances  

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

Water Vapor in the NCAR CAM3 Climate Model with Water Vapor in the NCAR CAM3 Climate Model with RRTMG/McICA using Modeled and Observed AIRS Spectral Radiances Michael J. Iacono, Atmospheric and Environmental Research, Inc., 131 Hartwell Avenue, Lexington, MA 02421 USA 1. Overview Objectives: * Evaluate water vapor and temperature simulation in two versions of CAM3 by comparing modeled and observed cloud-cleared AIRS spectral radiances. * Use spectral differences to verify comparisons between modeled water vapor and temperature and observed fields retrieved from AIRS radiances. Models: OSS: Optimal Spectral Sampling model developed at AER was used to simulate clear sky AIRS radiance spectra in CAM3. RRTMG/McICA: ARM-supported LW and SW radiative transfer model developed at AER for application to GCMs. RRTMG has been fully

63

Satellite Data Assimilation in Numerical Weather Prediction Models. Part II: Uses of Rain-Affected Radiances from Microwave Observations for Hurricane Vortex Analysis  

Science Journals Connector (OSTI)

A hybrid variational scheme (HVAR) is developed to produce the vortex analysis associated with tropical storms. This scheme allows for direct assimilation of rain-affected radiances from satellite microwave instruments. In the HVAR, the ...

Fuzhong Weng; Tong Zhu; Banghua Yan

2007-11-01T23:59:59.000Z

64

Implications of an open, extensible, and distributed hypermedia information system architecture for interprocess communication subsystem design  

E-Print Network [OSTI]

in an information system as openness and extensibility. Secondly, it was shown that the design and implementation of an interprocess communication subsystem has critical implications for the supersystem into which it is integrated. Namely, if the interprocess...

Nuernberg, Peter John

1994-01-01T23:59:59.000Z

65

CMS Distribution Subsystem user`s guide. Software Version 2.0  

SciTech Connect (OSTI)

The Common Mapping Standard (CMS) Data Production System (CDPS) produces and distributes CMS data in compliance with the Common Mapping Standard Interface Control Document. CDPS is composed of two subsystems the CMS Distribution Subsystem (CDS) and the CMS Preprocessing Subsystem (CPS). This guide describes the operation of CDS. CDS is responsible for the management of archived CMS data, the management of production orders, and the generation of theater databases. This subsystem was developed for use on a workstation running Ultrix 4.2, the X Window System Version X11R4, and motif Version 1.1. CDS is organized into seven major functional groups and supports archiving and distributing CMS data for selected products.

Gash, J.D.; Greitzer, F.L.; Hatfield, L.D.; Portwood, M.H.; Turney, C.R.

1993-12-01T23:59:59.000Z

66

An FPGA implementation of multicore, multithreaded powerPC processors with memory subsystem using Bluespec  

E-Print Network [OSTI]

This thesis describes the design, construction and integration of a multicore processor and a memory subsystem. The work is part of a joint project with IBM Watson research. The processors have multithreading capacities ...

Yamhure, Alessandro

2008-01-01T23:59:59.000Z

67

CMS Preprocessing Subsystem user`s guide: Software Version 2.0  

SciTech Connect (OSTI)

The Common Mapping Standard (CMS) Data Production System (CDPS) produces and distributes CMS data in compliance with the Common Mapping Standard Interface Control Document. CDPS is composed of two subsystems, the CMS Preprocessing Subsystem (CPS) and the CMS Distribution Subsystem (CDS). This guide describes the operation of CPS. CPS is responsible for the management of source data and the production of CMS data from source data. The CPS system was developed for use on a workstation running Ultrix 4.2, the X Window System Version X11R4, and motif Version 1.1. This subsystem is organized into four major functional groups and supports production of CMS data from source chart, indose, and elevation data products.

Didier, B.T.; Gash, J.D.; Greitzer, F.L.; Havre, S.L.; Ramsdell, J.V.; Turney, C.R.

1993-12-01T23:59:59.000Z

68

Improving Gas-Fired Heat Pump Capacity and Performance by Adding a Desiccant Dehumidification Subsystem  

E-Print Network [OSTI]

capacity 50%. Increased initial manufacturing costs are estimated at around $500/ton ($142/kW) for volume production. This cost Level is expected to reduce the total initial cost per ton compared to a system without the desiccant subsystem....

Parsons, B. K.; Pesaran, A. A.; Bharathan, D.; Shelpuk, B. C.

1990-01-01T23:59:59.000Z

69

INVERSE PROTEIN FOLDING, HIERARCHICAL OPTIMISATION  

E-Print Network [OSTI]

INVERSE PROTEIN FOLDING, HIERARCHICAL OPTIMISATION AND TIE KNOTS Thomas M. A. Fink st. john Introduction 3 1.1 Inverse Protein Folding 3 1.2 Hierarchical Optimisation 5 1.3 Tie Knots 6 1.4 Schematic Organisation 6 1.5 Publications 9 2 Protein Folding, Inverse Protein Folding and Energy Landscapes 10 2

Halligan, Daniel

70

NREL: Computational Science - Inverse Design  

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

Inverse Design Inverse Design The NREL Computational Science Center collaborates with the High Throughput and Inverse Band Structure (HT/IBS) Group within the Center for Inverse Design (CID) to research, design, and create materials with given target properties. The Center for Inverse Design is an Energy Frontier Research Center of the U.S. Department of Energy Office of Science. To address a crucial scientific grand challenge, the Center is pursuing a new approach to material science. Rather than using the conventional direct approach ("Given the structure, find the electronic properties"), we are using a "materials by inverse design" approach ("Given the desired property, find the structure"). Illustration of a blue arrow pointing to a graphic with three curved lines that represent an electronic structure and blue arrow pointing to a red and blue balls that represent an atomic configuration.

71

Nonlocal independent pixel approximation: Direct and inverse problems  

SciTech Connect (OSTI)

The independent pixel approximation (IPA), which treats radiative properties of each pixel independently by using standard plane-parallel calculations preserves scale-invariance found in the analyses of the horizontal variability of liquid water in marine stratocumulus clouds. Several studies, however, report a violation of scale-invariance in LANDSAT cloud radiance fields that are much smoother than cloud structure on small scales. This shows a limitation of IPA on small scales: it is unable to simulate the smooth small-scale behavior that is due to the horizontal photon transport. This paper introduces a nonlocal independent pixel approximation (NIPA) that extends the IPA by incorporating empirically the smoothing effects of horizontal interpixel fluxes through a convolution product of the IPA and an approximate Green function for radiative transfer. The authors also address the inverse problem of cloud optical depth retrieval from satellite data, showing how NIPA can be used to overcome the limitations of current IPA-based methods at small scales.

Marshak, A. [NASA Goddard Space Flight Center, Greenbelt, MD (United States). Climate and Radiation Branch] [NASA Goddard Space Flight Center, Greenbelt, MD (United States). Climate and Radiation Branch; [Univ. of Maryland Baltimore County, Baltimore, MD (United States). Joint Center for Earth Systems Technology; Davis, A. [NASA Goddard Space Flight Center, Greenbelt, MD (United States). Climate and Radiation Branch] [NASA Goddard Space Flight Center, Greenbelt, MD (United States). Climate and Radiation Branch; [Science Systems and Applications, Inc., Lanham, MD (United States); Cahalan, R.F.; Wiscombe, W. [NASA Goddard Space Flight Center, Greenbelt, MD (United States). Climate and Radiation Branch] [NASA Goddard Space Flight Center, Greenbelt, MD (United States). Climate and Radiation Branch

1998-01-01T23:59:59.000Z

72

A study of generalized inverses  

E-Print Network [OSTI]

A STUDY OF GENERALIZED INVERSES A Thesis by NANCY LEE MCKINNEY Submitted to the Graduate College of Texas ASM University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE August 1973 Major Subject: Mathematics A... STUDY OF GENERALIZED INVERSES A Thesis by NANCY LEE MCKINNEY Approved as to style and content by: airman o ittee Hea o epartment e er Me er August 1973 ABSTRACT A Study of Generalized Inverses. (August 1973) Nancy Lee NcKinney, B. A...

McKinney, Nancy Lee

1973-01-01T23:59:59.000Z

73

CMS Distribution Subsystem User`s Guide. Software: Version 1.2  

SciTech Connect (OSTI)

Historically, tactical mission planning systems have been the primary clients of CMS data. CDPS is composed of two subsystems, the CMS Preprocessing Subsystem (CPS) and the CMS Distribution Subsystem (CDS). This guide describes the operation of CDS. References and other resources used for the preparation of this guide are listed. CDS is responsible for the management of archived CMS data, the management of production orders and the generation of theater databases. The CDS system was developed for use on a workstation running Ultrix 4.2, the X Window System Version X11R4, and Motif Version 1.1. CDS is organized into seven major functional groups: CDS Executive, Manage Processed Data, Display CMS Data, Manage Production Orders, Build Theater Databases, Administration Tools, and System Utilities.

Gash, J.D.; Greitzer, F.L.; Hatfield, L.D.; Portwood, M.H.; Turney, C.R.

1993-10-01T23:59:59.000Z

74

FY2002 Annual Progress Report for the Light Vehicle Propulsioin & Ancillary Subsystems Program  

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

& Vehicle Technologies & Vehicle Technologies 1000 Independence Avenue, S.W. Washington, DC 20585-0121 FY 2002 Annual Progress Report for the Light Vehicle Propulsion & Ancillary Subsystems Program Submitted to: U.S. Department of Energy Energy Efficiency and Renewable Energy Office of FreedomCAR & Vehicle Technologies Vehicle Systems Team Robert Kost, Team Leader January 2003 Light Vehicle Propulsion & Ancillary Subsystems Program FY 2002 Annual Progress Report CONTENTS I. INTRODUCTION ............................................................................................... 1 II. TECHNOLOGY REQUIREMENTS DEFINITION....................................... 3 A. Simulation Model Development ..................................................................... 3 1. Improvement, Validation and Application of Advanced

75

S?PRIME Heat Transport and Heat Rejection Subsystems Design Optimization  

Science Journals Connector (OSTI)

The purpose of this paper is to describe the design status of the Rocketdyne space power reactor incore multicell evolutionary (S?PRIME) design of the heat transport and heat rejection subsystems. The basic design concept is similar to that described previously; however several detail design changes have resulted from changes in requirements. Improved definition of the various loop components has evolved from the performance of various trade studies. Overall layouts of the subsystem have been completed and the majority of the components are ready for preliminary design. The design will provide for the safe and reliable cooling of the nuclear reactor in a proven lightweight configuration.

Michael P. Moriarty

1994-01-01T23:59:59.000Z

76

Inverse Problems and Industrial Mathematics  

E-Print Network [OSTI]

line coke ore charging of ore and coke layers indirect reduction of ore by CO and H2 Inverse Problems in process parameters - charging strategy (distribution of coke-ore layers) - different raw materials Inverse and uniform quality of produced liquid iron - the decrease of coke consumption - a uniform gas mass flow

Fulmek, Markus

77

Modeling the pneumatic subsystem of a S-cam air brake system  

E-Print Network [OSTI]

The air brake system is one of the critical components in ensuring the safe operation of any commercial vehicle. This work is directed towards the development of a fault-free model of the pneumatic subsystem of the air brake system. This model can...

Coimbatore Subramanian, Shankar

2004-09-30T23:59:59.000Z

78

Subsystem functionals in density-functional theory: Investigating the exchange energy per particle R. Armiento*  

E-Print Network [OSTI]

Subsystem functionals in density-functional theory: Investigating the exchange energy per particle; published 31 October 2002 A viable way of extending the successful use of density-functional theory for slowly varying densities and discuss the implications of our findings on the future of functional

Armiento, Rickard

79

Describing long-range charge-separation processes with subsystem density-functional theory  

SciTech Connect (OSTI)

Long-range charge-transfer processes in extended systems are difficult to describe with quantum chemical methods. In particular, cost-effective (non-hybrid) approximations within time-dependent density functional theory (DFT) are not applicable unless special precautions are taken. Here, we show that the efficient subsystem DFT can be employed as a constrained DFT variant to describe the energetics of long-range charge-separation processes. A formal analysis of the energy components in subsystem DFT for such excitation energies is presented, which demonstrates that both the distance dependence and the long-range limit are correctly described. In addition, electronic couplings for these processes as needed for rate constants in Marcus theory can be obtained from this method. It is shown that the electronic structure of charge-separated states constructed by a positively charged subsystem interacting with a negatively charged one is difficult to converge charge leaking from the negative subsystem to the positive one can occur. This problem is related to the delocalization error in DFT and can be overcome with asymptotically correct exchangecorrelation (XC) potentials or XC potentials including a sufficiently large amount of exact exchange. We also outline an approximate way to obtain charge-transfer couplings between locally excited and charge-separated states.

Solovyeva, Alisa; Neugebauer, Johannes, E-mail: j.neugebauer@uni-muenster.de [Theoretische Organische Chemie, Organisch-Chemisches Institut and Center for Multiscale Theory and Simulation, Westflische Wilhelms-Universitt Mnster, Corrensstrae 40, 48149 Mnster (Germany)] [Theoretische Organische Chemie, Organisch-Chemisches Institut and Center for Multiscale Theory and Simulation, Westflische Wilhelms-Universitt Mnster, Corrensstrae 40, 48149 Mnster (Germany); Pavanello, Michele, E-mail: m.pavanello@rutgers.edu [Department of Chemistry, Rutgers University, 73 Warren St., Newark, New Jersey 07102 (United States)] [Department of Chemistry, Rutgers University, 73 Warren St., Newark, New Jersey 07102 (United States)

2014-04-28T23:59:59.000Z

80

On Designing Mixed-Signal Programmable Fuzzy Logic Controllers as Embedded Subsystems in Standard CMOS Technologies  

E-Print Network [OSTI]

On Designing Mixed-Signal Programmable Fuzzy Logic Controllers as Embedded Subsystems in Standard analogue Fuzzy Logic Controller (FLC) is presented. Input and output signals are processed in the analog the choice of on-chip controllers becomes an interesting option. Digital Fuzzy Logic chips provide enough

Verleysen, Michel

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

CMS Preprocessing Subsystem user`s guide. Software version 1.2  

SciTech Connect (OSTI)

The Common Mapping Standard (CMS) Data Production System (CDPS) produces and distributes CMS data in compliance with the Common Mapping Standard Interface Control Document, Revision 2.2. Historically, tactical mission planning systems have been the primary clients of CMS data. CDPS is composed of two subsystems, the CMS Preprocessing Subsystem (CPS) and the CMS Distribution Subsystem (CDS). This guide describes the operation of CPS, which is responsible for the management of source data and the production of CMS data from source data. The CPS system was developed for use on a workstation running Ultrix 4.2, and X Window System Version X11R4, and Motif Version 1.1. This subsystem is organized into four major functional groups: CPS Executive; Manage Source Data; Manage CMS Data Preprocessing; and CPS System Utilities. CPS supports the production of CMS data from the following source chart, image, and elevation data products: Global Navigation Chart; Jet Navigation Chart; Operational Navigation Chart; Tactical Pilotage Chart; Joint Operations Graphics-Air; Topographic Line Map; ARC Digital Raster Imagery; Digital Terrain Elevation Data (Level 1); and Low Flying Chart.

Didier, B.T.; Gash, J.D.; Greitzer, F.L.; Havre, S.L.; Ramsdell, J.V.; Turney, C.R.

1993-10-01T23:59:59.000Z

82

Performance of solid-gas chemical heat pump subsystem of solar dryer  

Science Journals Connector (OSTI)

In this paper the performance of solid-gas chemical heat pump subsystem of solar dryer has been investigated. A thermodynamic analysis is presented to upgrade solar energy with solid-gas chemical heat pump for agriculture drying purpose. A solar assisted ... Keywords: coefficient of performance (COPh), drying, evacuated tubes, overall COPs, solar, solid gas chemical heats pump

M. Ibrahim; W. R. W. Daud; Kamaruzaman Ibrahim; Azami Zaharim; Kamaruzaman Sopian

2010-01-01T23:59:59.000Z

83

JETC: Joint Energy Thermal and Cooling Management for Memory and CPU Subsystems in Servers  

E-Print Network [OSTI]

JETC: Joint Energy Thermal and Cooling Management for Memory and CPU Subsystems in Servers Raid In this work we propose a joint energy, thermal and cooling management technique (JETC) that significantly re- duces per server cooling and memory energy costs. Our analysis shows that decoupling the optimization

Simunic, Tajana

84

Memory Subsystem Description in EXPRESSION Prabhat Mishra Peter Grun Nikil Dutt Alex Nicolau  

E-Print Network [OSTI]

Memory Subsystem Description in EXPRESSION Prabhat Mishra Peter Grun Nikil Dutt Alex Nicolau Science University of California, Irvine, CA 92697, USA October 2000 Abstract Memory represents a major bottleneck in modern embedded systems. Traditionally, memory orga- nizations for programmable systems assumed

Mishra, Prabhat

85

Chapter 6 - Seismic Inversion Techniques  

Science Journals Connector (OSTI)

Abstract Seismic inversion techniques were developed as a discipline at the same time that seismic technologies were widely applied in oil exploration and development starting in the 1980s. Except for basic theories and principles, seismic inversion techniques are different from traditional seismic exploration methods in geological tasks, involving basic information as well as study approaches. In the early stages of exploration, the geological task of seismic exploration was to find structures and identify traps, and seismic exploration techniques always focused on the ups and downs of reflection interfaces. They mainly relied on the travel time for structural interpretation. The main work of reservoir geophysics is to study the heterogeneity of a reservoir, and the main geological task is to make predictions on the reservoir parameters. Scientists focus on the lateral variation of reservoir characteristics and conduct seismic interpretation based on the information extracted from the results of reservoir seismic inversion. Seismic inversion has developed rapidly in recent years, including recursive inversion, log-constrained inversion, and multiparameter lithological seismic inversion. We choose different methods according to the geological characteristics and specific problems of the study area.

Ming Li; Yimin Zhao

2014-01-01T23:59:59.000Z

86

Center for Inverse Design: Publications  

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

a bell curve on a graph with many points defined. New selection metric for design of thin-film solar cell absorber materials The Center for Inverse Design has developed...

87

Solar radius determination from SODISM/PICARD and HMI/SDO observations of the decrease of the spectral solar radiance during the June  

E-Print Network [OSTI]

Solar radius determination from SODISM/PICARD and HMI/SDO observations of the decrease of the spectral solar radiance during the June 2012 Venus transit A. Hauchecorne1 , M. Meftah1 , A. Irbah1 , S of Venus provided a rare opportunity to determine the radius of the Sun using solar imagers observing

Paris-Sud XI, Université de

88

Direct Insertion of MODIS Radiances in a Global Aerosol Transport Model CLARK WEAVER,* ARLINDO DA SILVA, MIAN CHIN,# PAUL GINOUX,@ OLEG DUBOVIK,&,@@  

E-Print Network [OSTI]

is directly inserted into the Goddard Chemistry and Aerosol Radiation Transport model (GOCART), which aerosol radiative forcing in the thermody- namic equation of GCMs, 3) to account for the reduc- tionDirect Insertion of MODIS Radiances in a Global Aerosol Transport Model CLARK WEAVER,* ARLINDO DA

Chin, Mian

89

Analyzing Black Hole super-radiance Emission of Particles/Energy from a Black Hole as a Gedankenexperiment to get bounds on the mass of a Graviton  

E-Print Network [OSTI]

Use of super-radiance in BH physics, so dE/dt alternatives with the possibility of needing a multiverse containment of BH structure, or embracing what Hawkings wrote up recently, namely a re do of the Event Horizon hypothesis as we know it.

Andrew Beckwith

2014-04-15T23:59:59.000Z

90

Remotely Controlled, Continuous Observations of Infrared Radiance with the CSIRO/ARM Mark II Radiometer at the SGP CART Site  

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

Remotely Controlled, Continuous Observations of Remotely Controlled, Continuous Observations of Infrared Radiance with the CSIRO/ARM Mark II Radiometer at the SGP CART Site C. M. R. Platt and R. T. Austin Department of Atmospheric Science Colorado State University Fort Collins, Colorado C. M. R. Platt and J. A. Bennett Commonwealth Scientific and Industrial Research Organization Atmospheric Research Aspendale, Victoria, Australia Abstract The Commonwealth Scientific and Industrial Research Organization/Atmospheric Radiation Measurement (CSIRO/ARM) Program Mark II infrared (IR) filter radiometer operated continuously at the Southern Great Plains (SGP) Cloud and Radiation Testbed (CART) site for a period of five weeks. Data of high quality were obtained by remote operation and data transfer with no evidence of spurious

91

FY2001 Annual Progress Report for the Vehicle Propulsion & Ancillary Subsystems Program  

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

PROPULSION & PROPULSION & ANCILLARY SUBSYSTEMS 2 0 0 1 A N N UA L P R O G R E S S R E P O R T U.S. Department of Energy Energy Efficiency and Renewable Energy Office of Transportation Technologies A C K N O W L E D G E M E N T We would like to express our sincere appreciation to Argonne National Laboratory and Computer Systems Management, Inc., for their artistic and technical contributions in preparing and publishing this report. In addition, we would like to thank all our program participants for their contributions to the programs and all the authors who prepared the project abstracts that comprise this report. U.S. Department of Energy Office of Advanced Automotive Technologies 1000 Independence Avenue, S.W. Washington, D.C. 20585-0121 FY 2001 Annual Progress Report for the Vehicle Propulsion & Ancillary Subsystems Program

92

Thermal-storage-subsystem analysis report (RADL Item 5-1)  

SciTech Connect (OSTI)

Calculations and internal Rocketdyne memos generated in support of the Thermal Storage Subsystem design are presented. The calculations are presented informally, i.e., original hand calculations are included. General descriptions of computer programs are given where applicable. Correlation of experimental test results with model predictions are made. Environmental extremes are summarized. These extremes, together with Pilot Plant operating requirements, form the inputs to the analyses. Outputs of the thermal analyses in the form of temperatures and temperature gradients are used as inputs to the stress analyses. System level analyses are presented. Subsequent analyses are presented in the order of the WBS format, i.e., Thermal Storage Unit, heat exchangers, controls and instrumentation. The results of charging and discharging loop simulations are included. Subsystem level analyses include pressure loss calculations for both steam/water loops and for both oil loops. These pressure loss calculations provide sizing requirements for pumps, valves, pipes and other components.

Not Available

1980-02-01T23:59:59.000Z

93

Inversion of the star transform  

E-Print Network [OSTI]

We define the star transform as a generalization of the broken ray transform introduced by us in previous work. The advantages of using the star transform include the possibility to reconstruct the absorption and the scattering coefficients of the medium separately and simultaneously (from the same data) and the possibility to utilize scattered radiation which, in the case of the conventional X-ray tomography, is discarded. In this paper, we derive the star transform from physical principles, discuss its mathematical properties and analyze numerical stability of inversion. In particular, it is shown that stable inversion of the star transform can be obtained only for configurations involving odd number of rays. Several computationally-efficient inversion algorithms are derived and tested numerically.

Fan Zhao; John C. Schotland; Vadim A. Markel

2014-05-06T23:59:59.000Z

94

Method of and apparatus for preheating pressurized fluidized bed combustor and clean-up subsystem of a gas turbine power plant  

DOE Patents [OSTI]

In a gas turbine power plant having a pressurized fluidized bed combustor, gas turbine-air compressor subsystem and a gas clean-up subsystem interconnected for fluid flow therethrough, a pipe communicating the outlet of the compressor of the gas turbine-air compressor subsystem with the interior of the pressurized fluidized bed combustor and the gas clean-up subsystem to provide for flow of compressed air, heated by the heat of compression, therethrough. The pressurized fluidized bed combustor and gas clean-up subsystem are vented to atmosphere so that the heated compressed air flows therethrough and loses heat to the interior of those components before passing to the atmosphere.

Cole, Rossa W. (E. Rutherford, NJ); Zoll, August H. (Cedar Grove, NJ)

1982-01-01T23:59:59.000Z

95

MIT inverse Compton source concept  

E-Print Network [OSTI]

A compact X-ray source based on inverse Compton scattering of a high-power laser on a high-brightness linac beam is described. The facility can operate in two modes: at high (MHz) repetition rate with flux and brilliance ...

Graves, William S.

96

Kinematic Stirling engine as an energy conversion subsystem for paraboloidal dish solar thermal power plants  

SciTech Connect (OSTI)

The potential of a suitably designed and economically manufactured Stirling engine as the energy conversion subsystem of a paraboloidal dish-Stirling solar thermal power module has been estimated. Results obtained by elementary cycle analyses have been shown to match quite well the performance characteristics of an advanced kinematic Stirling engine, the United Stirling P-40, as established by current prototypes of the engine and by a more sophisticated analytic model of its advanced derivative. In addition to performance, brief consideration has been given to other Stirling engine criteria such as durability, reliability, and serviceability. Production costs have not been considered here.

Bowyer, J.M.

1984-04-15T23:59:59.000Z

97

Kinematic Stirling engine as an energy conversion subsystem for paraboloidal dish solar thermal plants  

SciTech Connect (OSTI)

The potential of a suitably designed and economically manufactured Stirling engine as the energy conversion subsystem of a paraboloidal dish-Stirling solar thermal power module was estimated. Results obtained by elementary cycle analyses were shown to match quite well the performance characteristics of an advanced kinematic Stirling engine, the United Stirling P-40, as established by current prototypes of the engine and by a more sophisticated analytic model of its advanced derivative. In addition to performance, brief consideration was given to other Stirling engine criteria such as durability, reliability, and serviceability. Production costs were not considered here.

Bowyer, J.M.

1984-04-01T23:59:59.000Z

98

Multiparameter inversion in anisotropic elastic media  

Science Journals Connector (OSTI)

......volume fractions of sand and shale in a finely layered sand-shale sequence. 4 Anisotropic Inversion Via An Inverse Generalized...1994. An in situ estimation of anisotropic elastic moduli for a submarine shale.. J. geophys. Res., 99......

Robert Burridge; Maarten V. de Hoop; Douglas Miller; Carl Spencer

1998-09-01T23:59:59.000Z

99

Heat pipe cooled heat rejection subsystem modelling for nuclear electric propulsion. Final report  

SciTech Connect (OSTI)

NASA LeRC is currently developing a FORTRAN based computer model of a complete nuclear electric propulsion (NEP) vehicle that can be used for piloted and cargo missions to the Moon or Mars. Proposed designs feature either a Brayton or a K-Rankine power conversion cycle to drive a turbine coupled with rotary alternators. Both ion and magnetoplasmodynamic (MPD) thrusters will be considered in the model. In support of the NEP model, Rocketdyne is developing power conversion, heat rejection, and power management and distribution (PMAD) subroutines. The subroutines will be incorporated into the NEP vehicle model which will be written by NASA LeRC. The purpose is to document the heat pipe cooled heat rejection subsystem model and its supporting subroutines. The heat pipe cooled heat rejection subsystem model is designed to provide estimate of the mass and performance of the equipment used to reject heat from Brayton and Rankine cycle power conversion systems. The subroutine models the ductwork and heat pipe cooled manifold for a gas cooled Brayton; the heat sink heat exchanger, liquid loop piping, expansion compensator, pump and manifold for a liquid loop cooled Brayton; and a shear flow condenser for a K-Rankine system. In each case, the final heat rejection is made by way of a heat pipe radiator. The radiator is sized to reject the amount of heat necessary.

Moriarty, M.P.

1993-11-01T23:59:59.000Z

100

Optimization of the Target Subsystem for the New g-2 Experiment  

SciTech Connect (OSTI)

A precision measurement of the muon anomalous magnetic moment, a{sub {mu}} = (g-2)/2, was previously performed at BNL with a result of 2.2-2.7 standard deviations above the Standard Model (SM) theoretical calculations. The same experimental apparatus is being planned to run in the new Muon Campus at Fermilab, where the muon beam is expected to have less pion contamination and the extended dataset may provide a possible 7.5{sigma} deviation from the SM, creating a sensitive and complementary benchmark for proposed SM extensions. We report here on a preliminary simulation study of the target subsystem where the apparatus is optimized for pions that have favourable phase space to create polarized daughter muons around the magic momentum of 3.094 GeV/c, which is needed by the downstream g 2 muon ring.

Yoshikawa, C.; /Muons, Inc.; Leveling, A.; Mokhov, N.V.; Morgan, J.; Neuffer, D.; Striganov, S.; /Fermilab

2012-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Fast methods for inverse wave scattering problems  

E-Print Network [OSTI]

Inverse wave scattering problems arise in many applications including computerized/diffraction tomography, seismology, diffraction/holographic grating design, object identification from radar singals, and semiconductor ...

Lee, Jung Hoon, Ph. D. Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

102

NUMERICAL SOLUTION OF AN INVERSE OBSTACLE ...  

E-Print Network [OSTI]

such as nanotechnology, biology, information storage, and surface chemistry. Recently novel approaches have been developed for solving a class of inverse...

2014-09-30T23:59:59.000Z

103

Design of a telescope pointing and tracking subsystem for the Big Bear Solar Observatory New Solar Telescope  

E-Print Network [OSTI]

, California, U.S.A.; bNew Jersey Institute of Technology, Newark, New Jersey, U.S.A. ABSTRACT The New SolarDesign of a telescope pointing and tracking subsystem for the Big Bear Solar Observatory New Solar Telescope J. R. Varsika and G.Yangb aBig Bear Solar Observatory, 40386 North Shore Lane, Big Bear City

104

Hydrogen, Fuel Cells, and Infrastructure Technologies FY 2002 Progress Report IV.D Fuel Cell Stack Subsystem and Components  

E-Print Network [OSTI]

-Tolerant PEM Fuel Cell Stack System Tim Rehg (Primary Contact), Nguyen Minh (Program Manager) Honeywell electrolyte membrane (PEM) fuel cell stack system comprised of a PEM fuel cell stack and the supporting gas, thermal, and water management subsystems. The PEM fuel cell stack system will be capable of integration

105

Use of the ARM Measurements of Spectral Zenith Radiance for Better Understanding of 3D Cloud-Radiation Processes & Aerosol-Cloud Interaction  

SciTech Connect (OSTI)

We proposed a variety of tasks centered on the following question: what can we learn about 3D cloud-radiation processes and aerosol-cloud interaction from rapid-sampling ARM measurements of spectral zenith radiance? These ARM measurements offer spectacular new and largely unexploited capabilities in both the temporal and spectral domains. Unlike most other ARM instruments, which average over many seconds or take samples many seconds apart, the new spectral zenith radiance measurements are fast enough to resolve natural time scales of cloud change and cloud boundaries as well as the transition zone between cloudy and clear areas. In the case of the shortwave spectrometer, the measurements offer high time resolution and high spectral resolution, allowing new discovery-oriented science which we intend to pursue vigorously. Research objectives are, for convenience, grouped under three themes: ? Understand radiative signature of the transition zone between cloud-free and cloudy areas using data from ARM shortwave radiometers, which has major climatic consequences in both aerosol direct and indirect effect studies. ? Provide cloud property retrievals from the ARM sites and the ARM Mobile Facility for studies of aerosol-cloud interactions. ? Assess impact of 3D cloud structures on aerosol properties using passive and active remote sensing techniques from both ARM and satellite measurements.

Alexander Marshak; Warren Wiscombe; Yuri Knyazikhin; Christine Chiu

2011-05-24T23:59:59.000Z

106

Support minimized inversion of acoustic and elastic wave scattering  

SciTech Connect (OSTI)

This report discusses the following topics on support minimized inversion of acoustic and elastic wave scattering: Minimum support inversion; forward modelling of elastodynamic wave scattering; minimum support linearized acoustic inversion; support minimized nonlinear acoustic inversion without absolute phase; and support minimized nonlinear elastic inversion.

Safaeinili, A.

1994-04-24T23:59:59.000Z

107

Inverse problems in multifractal analysis  

E-Print Network [OSTI]

Multifractal formalism is designed to describe the distribution at small scales of the elements of $\\mathcal M^+_c(\\R^d)$, the set of positive, finite and compactly supported Borel measures on $\\R^d$. It is valid for such a measure $\\mu$ when its Hausdorff spectrum is the upper semi-continuous function given by the concave Legendre-Fenchel transform of the free energy function $\\tau_\\mu$ associated with $\\mu$; this is the case for fundamental classes of exact dimensional measures. For any function $\\tau$ candidate to be the free energy function of some $\\mu\\in \\mathcal M^+_c(\\R^d)$, we build such a measure, exact dimensional, and obeying the multifractal formalism. This result is extended to a refined formalism considering jointly Hausdorff and packing spectra. Also, for any upper semi-continuous function candidate to be the lower Hausdorff spectrum of some exact dimensional $\\mu\\in\\mathcal M^+_c(\\R^d)$, we build such a measure. Our results transfer to the analoguous inverse problems in multifractal analysis of H\\"older continuous functions.

Julien Barral

2014-09-29T23:59:59.000Z

108

MODEL SELECTION FOR SPECTROPOLARIMETRIC INVERSIONS  

SciTech Connect (OSTI)

Inferring magnetic and thermodynamic information from spectropolarimetric observations relies on the assumption of a parameterized model atmosphere whose parameters are tuned by comparison with observations. Often, the choice of the underlying atmospheric model is based on subjective reasons. In other cases, complex models are chosen based on objective reasons (for instance, the necessity to explain asymmetries in the Stokes profiles) but it is not clear what degree of complexity is needed. The lack of an objective way of comparing models has, sometimes, led to opposing views of the solar magnetism because the inferred physical scenarios are essentially different. We present the first quantitative model comparison based on the computation of the Bayesian evidence ratios for spectropolarimetric observations. Our results show that there is not a single model appropriate for all profiles simultaneously. Data with moderate signal-to-noise ratios (S/Ns) favor models without gradients along the line of sight. If the observations show clear circular and linear polarization signals above the noise level, models with gradients along the line are preferred. As a general rule, observations with large S/Ns favor more complex models. We demonstrate that the evidence ratios correlate well with simple proxies. Therefore, we propose to calculate these proxies when carrying out standard least-squares inversions to allow for model comparison in the future.

Asensio Ramos, A.; Manso Sainz, R.; Martinez Gonzalez, M. J.; Socas-Navarro, H. [Instituto de Astrofisica de Canarias, E-38205, La Laguna, Tenerife (Spain); Viticchie, B. [ESA/ESTEC RSSD, Keplerlaan 1, 2200 AG Noordwijk (Netherlands); Orozco Suarez, D., E-mail: aasensio@iac.es [National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan)

2012-04-01T23:59:59.000Z

109

Migration/inversion for transversely isotropic elastic media  

Science Journals Connector (OSTI)

......Inverse scattering solutions in anisotropic media, inGeophysical Inversion...plane-layered isotropic and anisotropic media by the state-space...1990 Velocity anisotropy in shale determined from crosshole...migration/inversion method for anisotropic elastic media. Our derivation......

David W. S. Eaton; Robert R. Stewart

1994-11-01T23:59:59.000Z

110

Inversion-free, noiseless Raman echoes  

E-Print Network [OSTI]

Using double optical Raman rephasing, an inversion-free resonant Raman echo is studied in an inhomogeneously broadened spin ensemble of a solid medium, where the Raman optical field-excited spin coherence has a frozen propagation vector. Unlike photon echoes whose quantum memory application is strictly limited due to \\pi rephasing pulse-induced population inversion causing quantum noises, the optical Raman field-excited spin echo is inherently silent owing to the frozen propagation vector. Thus, the doubly rephased Raman echo can be directly applied for quantum interface in a population inversion-free environment.

Byoung S. Ham

2011-11-20T23:59:59.000Z

111

Local Uniqueness for the Fixed Energy Fixed Angle Inverse Problem ...  

E-Print Network [OSTI]

Abstract. We prove local uniqueness for the inverse problem in obstacle scattering at a fixed energy and fixed incident angle. We consider the inverse problem of...

112

Center for Inverse Design: Research Thrusts and Subtasks  

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

Research Thrusts and Subtasks The Center for Inverse Design creates an unprecedented coupling of theory and experiment to realize the thesis that inverse design can revolutionize...

113

Joint inversion of electrical and seismic data for Fracture char...  

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

Joint inversion of electrical and seismic data for Fracture char. and Imaging of Fluid Flow in Geothermal Systems Joint inversion of electrical and seismic data for Fracture char....

114

National Ignition Facility subsystem design requirements NIF site improvements SSDR 1.2.1  

SciTech Connect (OSTI)

This Subsystem Design Requirements (SSDR) document establishes the performance, design, and verification requirements associated with the NIF Project Site at Lawrence Livermore National Laboratory (LLNL) at Livermore, California. It identifies generic design conditions for all NIF Project facilities, including siting requirements associated with natural phenomena, and contains specific requirements for furnishing site-related infrastructure utilities and services to the NIF Project conventional facilities and experimental hardware systems. Three candidate sites were identified as potential locations for the NIF Project. However, LLNL has been identified by DOE as the preferred site because of closely related laser experimentation underway at LLNL, the ability to use existing interrelated infrastructure, and other reasons. Selection of a site other than LLNL will entail the acquisition of site improvements and infrastructure additional to those described in this document. This SSDR addresses only the improvements associated with the NIF Project site located at LLNL, including new work and relocation or demolition of existing facilities that interfere with the construction of new facilities. If the Record of Decision for the PEIS on Stockpile Stewardship and Management were to select another site, this SSDR would be revised to reflect the characteristics of the selected site. Other facilities and infrastructure needed to support operation of the NIF, such as those listed below, are existing and available at the LLNL site, and are not included in this SSDR. Office Building. Target Receiving and Inspection. General Assembly Building. Electro- Mechanical Shop. Warehousing and General Storage. Shipping and Receiving. General Stores. Medical Facilities. Cafeteria services. Service Station and Garage. Fire Station. Security and Badging Services.

Kempel, P.; Hands, J.

1996-08-19T23:59:59.000Z

115

High-temperature turbine technology program. Turbine subsystem design report: Low-Btu gas  

SciTech Connect (OSTI)

The objective of the US Department of Energy High-Temperature Turbine Technology (DOE-HTTT) program is to bring to technology readiness a high-temperature (2600/sup 0/F to 3000/sup 0/F firing temperature) turbine within a 6- to 10-year duration, Phase II has addressed the performance of component design and technology testing in critical areas to confirm the design concepts identified in the earlier Phase I program. Based on the testing and support studies completed under Phase II, this report describes the updated turbine subsystem design for a coal-derived gas fuel (low-Btu gas) operation at 2600/sup 0/F turbine firing temperature. A commercial IGCC plant configuration would contain four gas turbines. These gas turbines utilize an existing axial flow compressor from the GE product line MS6001 machine. A complete description of the Primary Reference Design-Overall Plant Design Description has been developed and has been documented. Trends in overall plant performance improvement at higher pressure ratio and higher firing temperature are shown. It should be noted that the effect of pressure ratio on efficiency is significally enhanced at higher firing temperatures. It is shown that any improvement in overall plant thermal efficiency reflects about the same level of gain in Cost of Electricity (COE). The IGCC concepts are shown to be competitive in both performance and cost at current and near-term gas turbine firing temperatures of 1985/sup 0/F to 2100/sup 0/F. The savings that can be accumulated over a thirty-year plant life for a water-cooled gas turbine in an IGCC plant as compared to a state-of-the-art coal-fired steam plant are estimated. A total of $500 million over the life of a 1000 MW plant is projected. Also, this IGCC power plant has significant environmental advantages over equivalent coal-fired steam power plants.

Horner, M.W.

1980-12-01T23:59:59.000Z

116

Laboratory Results and Status Update for Pathfinder at LBT, The LINC-NIRVANA NGS Ground- Layer AO Subsystem  

E-Print Network [OSTI]

The full LINC-NIRVANA instrument will be one of the most complex ground-based astronomical systems ever built. It will consist of multiple subsystems, including two multi-conjugate ground layer AO systems (MCAO) that drive the LBT adaptive secondaries, two mid-high layer AO systems with their own Xynetics 349 actuator DM's , a fringe tracker, a beam combiner, and the NIR science camera. In order to mitigate risk, we take a modular approach to instrument testing and commissioning by decoupling these subsystems individually. The first subsystem tested on-sky will be one of the ground-layer AO systems, part of a test-bed known as the Pathfinder. The Pathfinder consists of a 12-star pyramid wavefront sensor (PWFS) that drives one of the LBT's adaptive secondaries, a support structure known as "The Foot," and the infrared test camera (IRTC), which is used for acquisition and alignment. The 12 natural guide stars are acquired by moveable arms called "star enlargers," each of which contains its own optical path. The...

Kopon, Derek; Bertram, Thomas; Herbst, Tom; Krster, Martin; Berwein, Jrgen; Ragazzoni, Roberto; Farinato, Jacopo; Viotto, Valentina; Bergomi, Maria; Rohloff, Ralf-Rainer; Baumeister, Harald; De Bonis, Fulvio; Hofferbert, Ralph; Brunelli, Alessandro; Arcidiacono, Carmelo; Pott, Jorg-Uwe; Bizenberger, Peter; Briegel, Florian; Meschke, Daniel; Mohr, Lars; Zhang, Xianyu; Kittmann, Frank

2014-01-01T23:59:59.000Z

117

Inverse Problems Regularized by Sparsity Martin Vetterli  

E-Print Network [OSTI]

the nuclear fallout of Fukushima? Conclusions Acknowledgements 1 #12;#12;Introduction: Sparsity is good example Forward model y(0, 0) = - x( + 0, tan 0) d Inverse ^x(, ) s.t. ^y(, ) y(, ) Usually

Combettes, Patrick Louis

118

Center for Inverse Design: Need Help?  

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

Need Help? Use this form to send us your comments and questions, to report problems with the Center for Inverse Design site, or to ask for help in finding information on our site....

119

INVERSE-SQUARE LAW TESTS 1 TESTS OF THE GRAVITATIONAL  

E-Print Network [OSTI]

INVERSE-SQUARE LAW TESTS 1 TESTS OF THE GRAVITATIONAL INVERSE-SQUARE LAW E.G.Adelberger, B-1560 KEYWORDS: gravitation, experimental tests of inverse-square law, quantum gravity, extra dimensions ABSTRACT: We review recent experimental tests of the gravitational inverse-square law, and the wide variety

Washington at Seattle, University of - Department of Physics, Electroweak Interaction Research Group

120

Population inversion in Landau-quantized graphene  

E-Print Network [OSTI]

Landau level lasers have the advantage of tunability of the laser frequency by means of the external magnetic field. The crucial prerequisite of such a laser is a population inversion between optically coupled Landau levels. Efficient carrier-carrier and carrier-phonon scattering generally suppresses this effect in conventional materials. Based on microscopic calculations, we predict for the first time the occurrence of a long-lived population inversion in Landau-quantized graphene and reveal the underlying many-particle mechanisms. To guide the experimental demonstration, we present optimal conditions for the observation of a maximal population inversion in terms of experimentally accessible parameters, such as the strength of the magnetic field, pump fluence, temperature, and doping. We reveal that in addition to the tunability of the Landau-level laser frequency, also the polarization of the emitted light can be tuned via gate voltage controlling the doping of the sample.

Wendler, Florian

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

JORDAN GEOMETRIES BY INVERSIONS WOLFGANG BERTRAM  

E-Print Network [OSTI]

JORDAN GEOMETRIES BY INVERSIONS WOLFGANG BERTRAM Abstract. Jordan geometries are defined as spaces equipped with point reflections Sx fixing x, and therefore the theories of Jordan geometries actions of torsors and of symmetric spaces is introduced. Jordan geometries give rise both to symmetry

122

"Sousveillance": inverse surveillance in multimedia imaging  

Science Journals Connector (OSTI)

This is a personal narrative that began 30 years ago as a childhood hobby, of wearing and implanting various sensors, effectors, and multimedia computation in order to re-define personal space and modify sensory perception computationally. This work ... Keywords: computer mediated reality, cyborglog, equiveillance, eyetap, inverse surveillance, sousveillance, surveillance, weblog

Steve Mann

2004-10-01T23:59:59.000Z

123

Focusing Inversion of Electroencephalography and Magnetoencephalography Data  

E-Print Network [OSTI]

or magnetic #12;eld recorded outside of the head. In this paper, we present a new minimization technique to the inverse bioelectric and biomagnetic #12;eld problems are functional brain studies and clinical diagnosis of neural disease, such as epilepsy. In functional brain studies, sensory signals stimulate the subject

Utah, University of

124

Global optimization in inverse problem of scatterometry  

E-Print Network [OSTI]

Global optimization in inverse problem of scatterometry Lekbir Afraites1,2 Jerome Hazard3 Patrick as a parametric optimization problem using the Least Square criterion. In this work, a design procedure for global robust optimization is developed using Kriging and global optimization approaches. Robustness

Paris-Sud XI, Université de

125

Invisibility and Inverse Problems Allan Greenleaf  

E-Print Network [OSTI]

Invisibility and Inverse Problems Allan Greenleaf Yaroslav Kurylev Matti Lassas, Gunther Uhlmann§ Abstract We describe recent theoretical and experimental progress on mak- ing objects invisible. Ideas issues involved. 1 Introduction Invisibility has been a subject of human fascination for millennia, from

Uhlmann, Gunther

126

Importance of Elevation and Temperature Inversions for the Interpretation  

Open Energy Info (EERE)

Importance of Elevation and Temperature Inversions for the Interpretation Importance of Elevation and Temperature Inversions for the Interpretation of Thermal Infrared Satellite Images Used in Geothermal Exploration Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Importance of Elevation and Temperature Inversions for the Interpretation of Thermal Infrared Satellite Images Used in Geothermal Exploration Details Activities (1) Areas (1) Regions (0) Abstract: Examples of nighttime temperature inversions are shown in thermal infrared satellite images collected over the Coso geothermal field in eastern California. Temperature-elevation plots show the normal trend of temperature decrease with elevation, on which temperature inversions appear superimposed as opposite trends. Such inversions are common and they should

127

Probing Pulsar Winds Using Inverse Compton Scattering  

E-Print Network [OSTI]

We investigate the effects of inverse Compton scattering by electrons and positrons in the unshocked winds of rotationally-powered binary pulsars. This process can scatter low energy target photons to produce gamma rays with energies from MeV to TeV. The binary radio pulsars PSR B1259-63 and PSR J0045-73 are both in close eccentric orbits around bright main sequence stars which provide a huge density of low energy target photons. The inverse Compton scattering process transfers momentum from the pulsar wind to the scattered photons, and therefore provides a drag which tends to decelerate the pulsar wind. We present detailed calculations of the dynamics of a pulsar wind which is undergoing inverse Compton scattering, showing that the deceleration of the wind of PSR B1259-63 due to `inverse Compton drag' is small, but that this process may confine the wind of PSR J0045-73 before it attains pressure balance with the outflow of its companion star. We calculate the spectra and light curves of the resulting inverse Compton emission from PSR B1259-63 and show that if the size of the pulsar wind nebula is comparable to the binary separation, then the gamma-ray emission from the unshocked wind may be detectable by atmospheric Cerenkov detectors or by the new generation of satellite-borne gamma-ray detectors such as INTEGRAL and GLAST. This mechanism may therefore provide a direct probe of the freely-expanding regions of pulsar winds, previously thought to be invisible.

Lewis Ball; J. G. Kirk

1999-08-18T23:59:59.000Z

128

Use of the ARM Measurement of Spectral Zenith Radiance For Better Understanding Of 3D Cloud-Radiation Processes and Aerosol-Cloud Interaction  

SciTech Connect (OSTI)

Our proposal focuses on cloud-radiation processes in a general 3D cloud situation, with particular emphasis on cloud optical depth and effective particle size. We also focus on zenith radiance measurements, both active and passive. The proposal has three main parts. Part One exploits the ?¢????solar-background?¢??? mode of ARM lidars to allow them to retrieve cloud optical depth not just for thin clouds but for all clouds. This also enables the study of aerosol cloud interactions with a single instrument. Part Two exploits the large number of new wavelengths offered by ARM?¢????s zenith-pointing ShortWave Spectrometer (SWS), especially during CLASIC, to develop better retrievals not only of cloud optical depth but also of cloud particle size. We also propose to take advantage of the SWS?¢???? 1 Hz sampling to study the ?¢????twilight zone?¢??? around clouds where strong aerosol-cloud interactions are taking place. Part Three involves continuing our cloud optical depth and cloud fraction retrieval research with ARM?¢????s 2NFOV instrument by, first, analyzing its data from the AMF-COPS/CLOWD deployment, and second, making our algorithms part of ARM?¢????s operational data processing.

D. Jui-Yuan Chiu

2010-10-19T23:59:59.000Z

129

Three-dimensional modelling and inversion of dc resistivity data incorporating topography II. Inversion  

Science Journals Connector (OSTI)

......geometric factors. However, the inversion process became instable and parameter values exceeded...Therefore, we split up the forward process into two parts: the time-intensive...criterion, in 69th Annual Internat. Mtg., Soc. Expl. Geophys., Expanded......

Thomas Gnther; Carsten Rcker; Klaus Spitzer

2006-08-01T23:59:59.000Z

130

COLLOQUIUM: Seismic Imaging and Inversion Based on Spectral-Element...  

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

shear attenuation and impedance contrasts. We apply this method to study seismic inverse problems at various scales, from exploration-scale full-waveform inversion to global-scale...

131

E-Print Network 3.0 - anatomy-based inverse planning Sample Search...  

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

in Fully-Discretized Inverse Problems of Summary: of Iterative Prescription Refinement (IPR) for inverse planning in any fully-discretized model of radiation... ), for inverse...

132

E-Print Network 3.0 - attenuated inversion recovery Sample Search...  

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

of a linear inverse problem. A full... values. 12;The Inverse DWT Since the wavelet transform matrix is orthonormal, Hence... the inverse transform is given by: ...

133

Inverse transport calculations in optical imaging with subspace optimization algorithms  

Science Journals Connector (OSTI)

Inverse boundary value problems for the radiative transport equation play an important role in optics-based medical imaging techniques such as diffuse optical tomography (DOT) and fluorescence optical tomography (FOT). Despite the rapid progress in the ... Keywords: Diffuse optical tomography, Fluorescence optical tomography, Inverse problems, Inverse transport problems, Optical imaging, Radiative transport equation, Singular value decomposition, Subspace optimization method

Tian Ding, Kui Ren

2014-09-01T23:59:59.000Z

134

Aquifer Structure Identification Using Stochastic Inversion  

SciTech Connect (OSTI)

This study presents a stochastic inverse method for aquifer structure identification using sparse geophysical and hydraulic response data. The method is based on updating structure parameters from a transition probability model to iteratively modify the aquifer structure and parameter zonation. The method is extended to the adaptive parameterization of facies hydraulic parameters by including these parameters as optimization variables. The stochastic nature of the statistical structure parameters leads to nonconvex objective functions. A multi-method genetically adaptive evolutionary approach (AMALGAM-SO) was selected to perform the inversion given its search capabilities. Results are obtained as a probabilistic assessment of facies distribution based on indicator cokriging simulation of the optimized structural parameters. The method is illustrated by estimating the structure and facies hydraulic parameters of a synthetic example with a transient hydraulic response.

Harp, Dylan R [Los Alamos National Laboratory; Dai, Zhenxue [Los Alamos National Laboratory; Wolfsberg, Andrew V [Los Alamos National Laboratory; Vrugt, Jasper A [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

135

Fast inversion of solar Ca II spectra  

E-Print Network [OSTI]

We present a fast (solar Ca II lines. The code uses an archive of spectra that are synthesized prior to the inversion under the assumption of local thermodynamic equilibrium (LTE). We show that it can be successfully applied to spectrograph data or more sparsely sampled spectra from two-dimensional spectrometers. From a comparison to a non-LTE inversion of the same set of spectra, we derive a first-order non-LTE correction to the temperature stratifications derived in the LTE approach. The correction factor is close to unity up to log tau ~ -3 and increases to values of 2.5 and 4 at log tau = -6 in the quiet Sun and the umbra, respectively.

Beck, C; Rezaei, R; Louis, R E

2014-01-01T23:59:59.000Z

136

Inverse hydrochemical models of aqueous extracts tests  

SciTech Connect (OSTI)

Aqueous extract test is a laboratory technique commonly used to measure the amount of soluble salts of a soil sample after adding a known mass of distilled water. Measured aqueous extract data have to be re-interpreted in order to infer porewater chemical composition of the sample because porewater chemistry changes significantly due to dilution and chemical reactions which take place during extraction. Here we present an inverse hydrochemical model to estimate porewater chemical composition from measured water content, aqueous extract, and mineralogical data. The model accounts for acid-base, redox, aqueous complexation, mineral dissolution/precipitation, gas dissolution/ex-solution, cation exchange and surface complexation reactions, of which are assumed to take place at local equilibrium. It has been solved with INVERSE-CORE{sup 2D} and been tested with bentonite samples taken from FEBEX (Full-scale Engineered Barrier EXperiment) in situ test. The inverse model reproduces most of the measured aqueous data except bicarbonate and provides an effective, flexible and comprehensive method to estimate porewater chemical composition of clays. Main uncertainties are related to kinetic calcite dissolution and variations in CO2(g) pressure.

Zheng, L.; Samper, J.; Montenegro, L.

2008-10-10T23:59:59.000Z

137

Inversion of marine magnetic anomalies by deconvolution  

E-Print Network [OSTI]

. Fahlqu st (Member) Terry W. encer (M er) Earl R. Hoskins (Head of Department) December 1983 ABSTRACT Inversion Of Marine Magnetic Anomalies By Deconvolution (December, 1983) Dennis Lee Harry B. S. , Texas A&M University Co... magnetization, j(x), with a transfer function, g(x), which is dependant upon the location and orientation of the anomaly profile and the ridge axis relative to the earth's present magnetic field [Bott, 1967]. This is expressed as f(x) f g(x-C) ](C) d0...

Harry, Dennis Lee

1983-01-01T23:59:59.000Z

138

ARM - Measurement - Shortwave broadband radiance  

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

0.4 and 4 mu, emitted by a radiator in a given direction, expressed in units of energy per unit time per unit solid angle. Categories Radiometric Instruments The above...

139

Use of curium neutron flux from head-end pyroprocessing subsystems for the High Reliability Safeguards methodology  

Science Journals Connector (OSTI)

Abstract The deployment of nuclear energy systems (NESs) is expanding around the world. Nations are investing in \\{NESs\\} as a means to establish energy independence, grow national economies, and address climate change. Transitioning to the advanced nuclear fuel cycle can meet growing energy demands and ensure resource sustainability. However, nuclear facilities in all phases of the advanced fuel cycle must be safeguardable, where safety, safeguards, and security are integrated into a practical design strategy. To this end, the High Reliability Safeguards (HRS) approach is a continually developing safeguardability methodology that applies intrinsic design features and employs a risk-informed approach for systems assessment that is safeguards-motivated. Currently, a commercial pyroprocessing facility is used as the example system. This paper presents a modeling study that investigates the neutron flux associated with processed materials. The intent of these studies is to determine if the neutron flux will affect facility design, and subsequently, safeguardability. The results presented in this paper are for the head-end subsystems in a pyroprocessing facility. The collective results from these studies will then be used to further develop the HRS methodology.

R.A. Borrelli

2014-01-01T23:59:59.000Z

140

Stochastic Joint Inversion for Integrated Data Interpretation in Geothermal Exploration  

Broader source: Energy.gov [DOE]

Stochastic Joint Inversion for Integrated Data Interpretation in Geothermal Exploration presentation at the April 2013 peer review meeting held in Denver, Colorado.

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

7. Twisted_inverse_image.pdf - Department of Mathematics, Purdue ...  

E-Print Network [OSTI]

Feb 20, 2009 ... Suresh Nayak extended Nagata's theorem, and hence the twisted inverse image, to essentially finite-type separated maps [arXiv:0809.1201].

2009-02-22T23:59:59.000Z

142

conference on inverse problems in honor of gunther uhlmann  

E-Print Network [OSTI]

Jun 18, 2012 ... These more general transforms come up in seismic imaging (inverse .... proof backed up by experimental evidence that Maxwell's fish eye in.

2012-06-20T23:59:59.000Z

143

Joint inversion of electrical and seismic data for Fracture char...  

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

Joint inversion of electrical and seismic data for Fracture char. and Imaging of Fluid Flow in Geothermal Systems Michael Batzle, PI Colorado School of Mines Track Name: Fluid...

144

Importance of Elevation and Temperature Inversions for the Interpretat...  

Open Energy Info (EERE)

Geothermal Exploration Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings: Importance of Elevation and Temperature Inversions for the...

145

Inverse Parametric Optimization with an Application to Hybrid ...  

E-Print Network [OSTI]

Jul 30, 2013 ... Abstract: We present a number of results on inverse parametric optimization and its application to hybrid system control. We show that any...

Andreas B. Hempel

2013-07-30T23:59:59.000Z

146

Center for Inverse Design: Collaboration Tool for the Center...  

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

Collaboration Tool for the Center for Inverse Design The SharePoint collaboration tool provides access to research results obtained from various theoretical and experimental...

147

Supersymmetric inversion of effective-range expansions  

E-Print Network [OSTI]

A complete and consistent inversion technique is proposed to derive an accurate interaction potential from an effective-range function for a given partial wave in the neutral case. First, the effective-range function is Taylor or Pad\\'e expanded, which allows high precision fitting of the experimental scattering phase shifts with a minimal number of parameters on a large energy range. Second, the corresponding poles of the scattering matrix are extracted in the complex wave-number plane. Third, the interaction potential is constructed with supersymmetric transformations of the radial Schr\\"odinger equation. As an illustration, the method is applied to the experimental phase shifts of the neutron-proton elastic scattering in the $^1S_0$ and $^1D_2$ channels on the $[0-350]$ MeV laboratory energy interval.

Bikashkali Midya; Jrmie Evrard; Sylvain Abramowicz; O. L. Ramrez Surez; Jean-Marc Sparenberg

2015-01-16T23:59:59.000Z

148

Zeros in (inverse) bremsstrahlung matrix elements  

Science Journals Connector (OSTI)

We discuss the possibility of zeros in the nonrelativistic radiative continuum-continuum matrix element for electron-atom (inverse) bremsstrahlung. As demonstrated earlier for upward transitions from bound states, the occurrence of different signs for the free-free matrix element in limiting cases, plus the requirement of continuity, implies the existence of zeros. Using knowledge of the sign of the dipole matrix element in the soft- and hard-photon limits with one continuum electron energy held fixed, we show that zeros can occur in the s-p matrix element. We discuss the connection of our results to elastic scattering and to Ramsauer-Townsend minima. We consider the observability of zeros in this (s-p) matrix element manifested as minima in the cross sections.

C. David Shaffer; R. H. Pratt; Sung Dahm Oh

1998-01-01T23:59:59.000Z

149

Supersymmetric inversion of effective-range expansions  

E-Print Network [OSTI]

A complete and consistent inversion technique is proposed to derive an accurate interaction potential from an effective-range function for a given partial wave in the neutral case. First, the effective-range function is Taylor or Pad\\'e expanded, which allows high precision fitting of the experimental scattering phase shifts with a minimal number of parameters on a large energy range. Second, the corresponding poles of the scattering matrix are extracted in the complex wave-number plane. Third, the interaction potential is constructed with supersymmetric transformations of the radial Schr\\"odinger equation. As an illustration, the method is applied to the experimental phase shifts of the neutron-proton elastic scattering in the $^1S_0$ and $^1D_2$ channels on the $[0-350]$ MeV laboratory energy interval.

Midya, Bikashkali; Abramowicz, Sylvain; Surez, O L Ramrez; Sparenberg, Jean-Marc

2015-01-01T23:59:59.000Z

150

Estimation of Parigi reservoir characteristics using seismic attributes, AVO analysis and AVO inversion, and seismic inversion  

SciTech Connect (OSTI)

In the carbonate reservoir, the gas was trapped in the cavity of the formation. First of all, to identify the cavity as the distribution of the cavity or porous zone will be done by reflection strength and instantaneous frequency from the seismic attribute analysis. After the zone has been identified, the existing gas and the value of porosity can be estimated using AVO analysis and AVO inversion technique. This idea was applied to the carbonate reservoir within the Parigi Formation in the Northwest Java Basin (Indonesia) by Santoso et al. The result shows a clear zone of high reflection strength and low instantaneous frequency in the carbonate build up. The porosity estimated by AVO inversion gives a value of the porosity about 38% and the Poisson`s ratio around 0.22-0.26. This paper is continuation of Santoso et al. study. It is done by the delineation of the porosity which can be displayed by the acoustic impedance section as a result of seismic inversion process. The delineation of the reservoir characters to the horizontal direction as previous study gives around a similar value as shown by acoustic impedance value. When these results were compared to the borehole data in the location, they are very close. Therefore this idea has given a satisfactory result in estimating porosity from seismic data and delineating the carbonate reservoir away from the borehole.

Santoso, D.; Hendrajaya, L.; Watkins, J.S. [and others

1995-12-31T23:59:59.000Z

151

JORDAN GEOMETRIES AN APPROACH VIA INVERSIONS WOLFGANG BERTRAM  

E-Print Network [OSTI]

JORDAN GEOMETRIES ­ AN APPROACH VIA INVERSIONS WOLFGANG BERTRAM Abstract. Jordan geometries]) as spaces equipped with point reflections Sx fixing x, and therefore the theories of Jordan geometries action of torsors and of symmetric spaces is introduced. Jordan geometries give rise both to inversive

Paris-Sud XI, Université de

152

Inversion of the Pieri formula for Macdonald polynomials  

E-Print Network [OSTI]

Inversion of the Pieri formula for Macdonald polynomials Michel Lassalle Centre National de la://www.mat.univie.ac.at/~schlosse February 8, 2004 Abstract We give the explicit analytic development of Macdonald polynomials in terms and phrases: Macdonald polynomials, Pieri formula, matrix inversion, symmetric functions, Schur functions

Schlosser, Michael

153

Program Inversion for Tail Recursive Functions Naoki Nishida1  

E-Print Network [OSTI]

inputs, say vi1 , . . . , vim , the partial inverse computation computes the remaining inputs vj1 , . . . , vjk such that f(v1, . . . , vn) = v with {vi1 , . . . , vim }{vj1 , . . . , vjk } = {v1, . . . , vn} and {vi1 , . . . , vim } {vj1 , . . . , vjk } = . Two approaches to inverse computation are distinguished

Vidal, Germán

154

INVERSE PROBLEM ON THE LINE WITHOUT PHASE INFORMATION  

E-Print Network [OSTI]

in neutron and x­ray scattering studies of surface and interface structures, see e.g. [FR91,FY96,ZC95 of a potential with support in a right half­line is studied in terms of the scattering data consisting Keywords: Phase retrieval, Inverse scattering, 1­D Schr¨odinger equation Short title: Inverse problem

155

INVERSE PROBLEM ON THE LINE WITHOUT PHASE INFORMATION  

E-Print Network [OSTI]

applications in neutron and x-ray scattering studies of surface and interface structures, see e.g. [FR91,FY96 of a potential with support in a right half-line is studied in terms of the scattering data consisting Keywords: Phase retrieval, Inverse scattering, 1-D Schrodinger equation Short title: Inverse problem

156

A computationally feasible approximate resolution matrix for seismic inverse problems  

Science Journals Connector (OSTI)

......traveltimes, 65th Ann. Int. Mtg, Soc. Expl. Geophys...mest in the inversion process: (1) where R E W...subsurface, the inversion process cannot generally return...I then applied this process to two field-data reflectivity...traveltimes, 65th Ann. Int. Mtg, Soc. Expl. Geophys......

Susan E. Minkoff

1996-08-01T23:59:59.000Z

157

Optical Aharonov-Bohm effect: an inverse hyperbolic problems approach  

E-Print Network [OSTI]

We describe the general setting for the optical Aharonov-Bohm effect based on the inverse problem of the identification of the coefficients of the governing hyperbolic equation by the boundary measurements. We interpret the inverse problem result as a possibility in principle to detect the optical Aharonov-Bohm effect by the boundary measurements.

Gregory Eskin

2007-10-18T23:59:59.000Z

158

Finite Element Discretization Strategies for the Inverse Electrocardiographic (ECG) Problem  

E-Print Network [OSTI]

Finite Element Discretization Strategies for the Inverse Electrocardiographic (ECG) Problem Dafang electrocardiographic (ECG) problems re- quires the ability to both quantify and minimize approxi- mation errors specifically for the inverse ECG prob- lem. By quantitatively analyzing the connection between the ill

Utah, University of

159

Inversion of synthetic aperture radar interferograms for sources of  

Open Energy Info (EERE)

Inversion of synthetic aperture radar interferograms for sources of Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie Valley geothermal field Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie Valley geothermal field Authors Bill Foxall and D. W. Vasco Published Journal Journal of Volcanology and Geothermal Research, 2008 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie Valley geothermal field Citation Bill Foxall,D. W. Vasco. 2008. Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie

160

Chapter 7 - Prestack Seismic Inversion and Seismic Attribute Analysis  

Science Journals Connector (OSTI)

Abstract Based on seismic, logging, and geological data, the seismic inversion technique can reveal the spatial characteristics (including reservoir thickness, structural characteristics, extending direction, extending range, pinch-out location, and others) of the target layers, such as reservoirs or coal seams. By combining a large area of the continuous distribution of seismic data with high-resolution well logging data, this technique transforms conventional seismic data into a high-resolution well data volume, enabling us to use the acoustic characteristics of rock formations to ascertain lithological interfaces. So we can extrapolate the borehole lithological and physical properties and hydrocarbon features from points to lines and lines to faces, and predict lateral reservoir variations and reservoir properties from known reservoir characteristics. Seismic inversion technology has been one of the core technologies for reservoir characteristics and reservoir prediction. Seismic attribute analysis is the premise of fine reservoir characteristics and fine 3D seismic interpretation, which help us uncover information about lithology and reservoir heterogeneity from seismic data. The work of seismic attribute analysis includes (1) extracting various seismic attributes from poststack seismic data; (2) conducting crossplot analysis of seismic attributes and reservoir properties (including geology, well logging, and petrophysical parameters) to establish relationships between seismic attributes and reservoir parameters; and (3) dynamically interpreting 3D seismic, geological, and logging data, which helps us to study the relationships between seismic reflection characteristics and sedimentary and tectonic information, predict the reservoir spatial distribution, and reveal how fracture systems influence the reservoir distribution. Development of the seismic inversion technique in reservoir characterization can be summarized in four stages: the first stage was in the 1960s. In this stage, the exploration targets were structural reservoirs, and seismic inversion techniques were not used. The second stage was in the 1970s. The exploration targets were structural and lithological reservoirs, and no well-constraint seismic inversion techniques were used. The third stage was in the 1980s, when many new techniques were developed. Seismic inversion techniques, including the prestack amplitude versus offset (AVO) technique and wave impedance inversion technique, developed rapidly and greatly improved our understanding of seismic reservoir characterization. The fourth stage is the stage of reservoir characterization and dynamic monitoring in the 1990s. Seismic inversion techniques are used for reservoir dynamic characterization, such as 3D AVO inversion, well-seismic joint inversion, reservoir characteristics curve reconstruction, multiparameter reservoir inversion, and the elastic wave impedance inversion techniques. Prestack seismic data contain richer information than do poststack data, so prestack seismic inversion and attribute analysis are increasingly important in oil and gas exploration.

Ming Li; Yimin Zhao

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Linearized Functional Minimization for Inverse Modeling  

SciTech Connect (OSTI)

Heterogeneous aquifers typically consist of multiple lithofacies, whose spatial arrangement significantly affects flow and transport. The estimation of these lithofacies is complicated by the scarcity of data and by the lack of a clear correlation between identifiable geologic indicators and attributes. We introduce a new inverse-modeling approach to estimate both the spatial extent of hydrofacies and their properties from sparse measurements of hydraulic conductivity and hydraulic head. Our approach is to minimize a functional defined on the vectors of values of hydraulic conductivity and hydraulic head fields defined on regular grids at a user-determined resolution. This functional is constructed to (i) enforce the relationship between conductivity and heads provided by the groundwater flow equation, (ii) penalize deviations of the reconstructed fields from measurements where they are available, and (iii) penalize reconstructed fields that are not piece-wise smooth. We develop an iterative solver for this functional that exploits a local linearization of the mapping from conductivity to head. This approach provides a computationally efficient algorithm that rapidly converges to a solution. A series of numerical experiments demonstrates the robustness of our approach.

Wohlberg, Brendt [Los Alamos National Laboratory; Tartakovsky, Daniel M. [University of California, San Diego; Dentz, Marco [Institute of Environmental Assessment and Water Research, Barcelona, Spain

2012-06-21T23:59:59.000Z

162

The relativistic inverse stellar structure problem  

SciTech Connect (OSTI)

The observable macroscopic properties of relativistic stars (whose equations of state are known) can be predicted by solving the stellar structure equations that follow from Einsteins equation. For neutron stars, however, our knowledge of the equation of state is poor, so the direct stellar structure problem can not be solved without modeling the highest density part of the equation of state in some way. This talk will describe recent work on developing a model independent approach to determining the high-density neutron-star equation of state by solving an inverse stellar structure problem. This method uses the fact that Einsteins equation provides a deterministic relationship between the equation of state and the macroscopic observables of the stars which are composed of that material. This talk illustrates how this method will be able to determine the high-density part of the neutron-star equation of state with few percent accuracy when high quality measurements of the masses and radii of just two or three neutron stars become available. This talk will also show that this method can be used with measurements of other macroscopic observables, like the masses and tidal deformabilities, which can (in principle) be measured by gravitational wave observations of binary neutron-star mergers.

Lindblom, Lee [Theoretical Astrophysics, California Institute of Technology, Pasadena, CA 91125 (United States)

2014-01-14T23:59:59.000Z

163

Joint inversion of receiver function and ambient noise based on Bayesian theory  

E-Print Network [OSTI]

In this study, we present a method for the joint inversion of receiver function and ambient noise based on Bayesian inverse theory (Tarantola, 1987, 2005). The nonlinear inversion method of the complex spectrum ratio of ...

van der Hilst, Robert D.

164

Inverse Freezing in Mean-Field Models of Fragile Glasses  

E-Print Network [OSTI]

A disordered spin model suitable for studying inverse freezing in fragile glass-forming systems is introduced. The model is a microscopic realization of the ``random-first order'' scenario in which the glass transition can be either continuous or discontinuous in thermodynamic sense. The phase diagram exhibits a first-order transition line between two fluid phases terminating at a critical point. When the interacting degrees of freedom are entropically favoured an inverse static glass transition and a double inverse dynamic freezing appear.

Mauro Sellitto

2006-03-14T23:59:59.000Z

165

Inverse freezing in mean-field models of fragile glasses  

Science Journals Connector (OSTI)

A disordered spin model suitable for studying inverse freezing in fragile glass-forming systems is introduced. The model is a microscopic realization of the random first-order scenario in which the glass transition can be either continuous or discontinuous in thermodynamic sense. The phase diagram exhibits a first-order transition line between two fluid phases terminating at a critical point. When the interacting degrees of freedom are entropically favored, an inverse static glass transition and a double inverse dynamic freezing appear.

Mauro Sellitto

2006-05-30T23:59:59.000Z

166

Simulations of Trade Wind Cumuli under a Strong Inversion  

Science Journals Connector (OSTI)

The fifth intercomparison of the Global Water and Energy Experiment Cloud System Studies Working Group 1 is used as a vehicle for better understanding the dynamics of trade wind cumuli capped by a strong inversion. The basis of the ...

Bjorn Stevens; Andrew S. Ackerman; Bruce A. Albrecht; Andrew R. Brown; Andreas Chlond; Joan Cuxart; Peter G. Duynkerke; David C. Lewellen; Malcolm K. Macvean; Roel A. J. Neggers; Enrique Snchez; A. Pier Siebesma; David E. Stevens

2001-07-01T23:59:59.000Z

167

A Thermohaline Inverse Method for Estimating Diathermohaline Circulation and Mixing  

Science Journals Connector (OSTI)

The thermohaline inverse method (THIM) is presented that provides estimates of the diathermohaline streamfunction , the downgradient along-isopycnal diffusion coefficient K, and the isotropic downgradient turbulent diffusion coefficient D of small-...

Sjoerd Groeskamp; Jan D. Zika; Bernadette M. Sloyan; Trevor J. McDougall; Peter C. McIntosh

2014-10-01T23:59:59.000Z

168

Strategies for Spectral Profile Inversion using Artificial Neural Networks  

E-Print Network [OSTI]

This paper explores three different strategies for the inversion of spectral lines (and their Stokes profiles) using artificial neural networks. It is shown that a straightforward approach in which the network is trained with synthetic spectra from a simplified model leads to considerable errors in the inversion of real observations. This problem can be overcome in at least two different ways that are studied here in detail. The first method makes use of an additional pre-processing auto-associative neural network to project the observed profile into the theoretical model subspace. The second method considers a suitable regularization of the neural network used for the inversion. These new techniques are shown to be robust and reliable when applied to the inversion of both synthetic and observed data, with errors typically below $\\sim$100 G.

H. Socas-Navarro

2004-10-23T23:59:59.000Z

169

Three-dimensional massively parallel electromagnetic inversionI. Theory  

Science Journals Connector (OSTI)

......waste-site evaluations, mineral, oil, and gas exploration, and more recently reservoir...parameter Because of the computational cost of using an exact forward solution...will also serve as an accuracy benchmark on approxi- mate inverse methods......

G. A. Newman; D. L. Alumbaugh

1997-02-01T23:59:59.000Z

170

Tests of the Gravitational Inverse-Square Law  

E-Print Network [OSTI]

We review recent experimental tests of the gravitational inverse-square law and the wide variety of theoretical considerations that suggest the law may break down in experimentally accessible regions.

E. G. Adelberger; B. R. Heckel; A. E. Nelson

2003-07-22T23:59:59.000Z

171

Modeling and inversion of self-potential data  

E-Print Network [OSTI]

This dissertation presents data processing techniques relevant to the acquisition, modeling, and inversion of self-potential data. The primary goal is to facilitate the interpretation of self-potentials in terms of the ...

Minsley, Burke J

2007-01-01T23:59:59.000Z

172

Inverse scattering by a continuation method with initial guesses from ...  

E-Print Network [OSTI]

Sep 5, 2007 ... b Department of Mathematics and Statistics, Louisiana Tech University, ... The present paper focuses on the inverse scattering problem. ..... Example 1: (a) the true scatterer; (b) the initial guess; and (c) the final reconstruction.

2007-10-11T23:59:59.000Z

173

Pivot-Free Block Matrix Inversion Stephen M. Watt  

E-Print Network [OSTI]

Pivot-Free Block Matrix Inversion Stephen M. Watt Ontario Research Centre for Computer Algebra Department of Computer Science University of Western Ontario London Ontario, CANADA N6A 5B7 watt

Watt, Stephen M.

174

Inverse transport calculations in optical imaging with subspace optimization algorithms  

E-Print Network [OSTI]

Kui Ren April 16, 2014 Abstract Inverse boundary value problems for the radiative transport equation transport problems, radiative transport equation, subspace optimization method, singular value decomposition physical parameters in the radiative transport equation from partial information on the solution

Ren, Kui

175

Forward and inverse metabolic engineering strategies for improving polyhydroxybyrate production  

E-Print Network [OSTI]

Forward metabolic engineering (FME) is a rational approach to cellular engineering, relying on an understanding of the entire metabolic network to direct perturbations for phenotype improvement. Conversely, inverse metabolic ...

Tyo, Keith E. J

2008-01-01T23:59:59.000Z

176

The Inverse Ocean Modeling System. Part I: Implementation  

Science Journals Connector (OSTI)

The Inverse Ocean Modeling (IOM) system constructs and runs weak-constraint, four-dimensional variational data assimilation (W4DVAR) for any dynamical model and any observing array. The dynamics and the observing algorithms may be nonlinear but ...

A. F. Bennett; B. S. Chua; B. L. Pflaum; M. Erwig; Z. Fu; R. D. Loft; J. C. Muccino

2008-09-01T23:59:59.000Z

177

Electromagnetic Inverse Problems Involving Distributions of Dielectric Mechanisms and Parameters  

E-Print Network [OSTI]

Electromagnetic Inverse Problems Involving Distributions of Dielectric Mechanisms and Parameters H University, Raleigh, NC 27695-8205 August 17, 2005 Abstract We consider electromagnetic interrogation, uniform, log-normal, and log-Bi-Gaussian distributions. Keywords: Electromagnetic interrogation

178

On the structure of inversive pseudorandom number generators  

Science Journals Connector (OSTI)

We analyze the lattice structure and linear complexity of a new inversive pseudorandom number generator recently introduced by Niederreiter and Rivat. In particular, we introduce a new lattice test which is much stronger than its predecessors and prove ...

Harald Niederreiter; Arne Winterhof

2007-12-01T23:59:59.000Z

179

Computational Inversion of Electron Tomography Images -Gradient Flows  

E-Print Network [OSTI]

Computational Inversion of Electron Tomography Images Using L2 -Gradient Flows Guoliang Xu 1) Ming Computing Institute of Computational Mathematics, Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing 100190, China 2) Department of Computer Sciences and Institute

Texas at Austin, University of

180

Advances in Inverse Transport Methods and Applications to Neutron Tomography  

E-Print Network [OSTI]

The purpose of the inverse-transport problems that we address is to reconstruct the material distribution inside an unknown object undergoing a nondestructive evaluation. We assume that the object is subjected to incident beams of photons...

Wu, Zeyun

2011-02-22T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Receiver subsystem analysis report (RADL Item 4-1). 10-MWe Solar Thermal Central-Receiver Pilot Plant: solar-facilities design integration  

SciTech Connect (OSTI)

The results are presented of those thermal hydraulic, structural, and stress analyses required to demonstrate that the Receiver design for the Barstow Solar Pilot Plant will satisfy the general design and performance requirements during the plant's design life. Recommendations resulting from those analyses and supporting test programs are presented regarding operation of the receiver. The analyses are limited to receiver subsystem major structural parts (primary tower, receiver unit core support structure), pressure parts (absorber panels, feedwater, condensate and steam piping/components, flash tank, and steam mainfold) and shielding. (LEW)

Not Available

1982-04-01T23:59:59.000Z

182

A Target-Oriented Magnetotelluric Inversion Approach For Characterizing The  

Open Energy Info (EERE)

Target-Oriented Magnetotelluric Inversion Approach For Characterizing The Target-Oriented Magnetotelluric Inversion Approach For Characterizing The Low Enthalpy Gross Schonebeck Geothermal Reservoir Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: A Target-Oriented Magnetotelluric Inversion Approach For Characterizing The Low Enthalpy Gross Schonebeck Geothermal Reservoir Details Activities (0) Areas (0) Regions (0) Abstract: Electrical conductivity is a key parameter for the exploration and characterization of geothermal reservoirs as hot mineralized formation water of active geothermal areas usually exhibits significantly higher conductivity than the surrounding host rock. Here we present results of a magnetotelluric (MT) exploration experiment carried out in the vicinity of the Gross Schonebeck geothermal test site in Northern Germany, where a

183

Inverse melting in a system with positive heats of formation  

SciTech Connect (OSTI)

Supersaturated body-centered-cubic Fe-W solid solutions with positive heats of formation were prepared by cosputtering and mechanical alloying over a wide concentration range. Upon annealing, these solid solutions were observed to undergo amorphization in the range of 20{endash}37 at.{percent} W. For Fe{sub 70}W{sub 30} and Fe{sub 67}W{sub 33} the transformation was polymorphous, indicating an inverse melting behavior. A thermodynamic analysis of the Fe-W system, which was carried out using the calculation-of-phase-diagrams method, supported that inverse melting is energetically possible in the Fe-W system. The results demonstrate that inverse melting can also occur in systems with positive heats of amorphous phase formation. {copyright} {ital 1997} {ital The American Physical Society}

Bai, H.Y.; Michaelsen, C.; Bormann, R. [Institute for Materials Research, GKSS-Research Center, Max-Planck-Strasse, D-21502 Geesthacht (Germany)] [Institute for Materials Research, GKSS-Research Center, Max-Planck-Strasse, D-21502 Geesthacht (Germany)

1997-11-01T23:59:59.000Z

184

Inversion kinetics for Kr-Xe bilayers on palladium  

Science Journals Connector (OSTI)

The thermally activated inversion of Kr-Xe bilayers on Pd is studied with the use of photoemission and photon-excited Auger spectroscopy. Bilayers formed by the deposit of a monolayer or less of Xe on top of a monolayer of Kr on Pd at 49 K are shown to invert when the temperature is raised, with Xe coming in direct contact with the substrate. For a Pd(111) substrate the activation energy of this inversion process is determined: Ea=0.120.03 eV.

G. Kaindl; T.-C. Chiang; D. E. Eastman

1982-06-15T23:59:59.000Z

185

Solving the inverse problem of noise-driven dynamic networks  

E-Print Network [OSTI]

Nowadays massive amount of data are available for analysis in natural and social systems. Inferring system structures from the data, i.e., the inverse problem, has become one of the central issues in many disciplines and interdisciplinary studies. In this Letter, we study the inverse problem of stochastic dynamic complex networks. We derive analytically a simple and universal inference formula called double correlation matrix (DCM) method. Numerical simulations confirm that the DCM method can accurately depict both network structures and noise correlations by using available kinetic data only. This inference performance was never regarded possible by theoretical derivation, numerical computation and experimental design.

Zhang, Zhaoyang; Niu, Haijing; Mi, Yuanyuan; Wu, Si; Hu, Gang

2014-01-01T23:59:59.000Z

186

Observation of the Inverse Cotton-Mouton Effect  

E-Print Network [OSTI]

We report the investigation of the Inverse Cotton-Mouton Effect (ICME) i.e. the magnetization induced in a medium by light propagating in the presence of a transverse magnetic field. We present a detailed study of the ICME in a TGG crystal showing the dependence of the measured effect on the laser power density and polarization, and on the static external magnetic field. We finally derive a relation between the Cotton-Mouton and Inverse Cotton-Mouton effects which is experimentally confirmed.

Baranga, Andrei Ben-Amar; Fouch, Mathilde; Rizzo, Carlo; Rikken, G L J A

2010-01-01T23:59:59.000Z

187

an inverse boundary value problem for the stationary transport ...  

E-Print Network [OSTI]

inverse problem (IP) for the time-dependent transport equation (?t ? T)u = 0, where T ... Then the pairs (?a,0) and (?a,0) (i.e. k = k = 0) produce the same .... Note that Jf? is defined so that T1Jf? = 0, Jf?|?? = f?, therefore J is the solution...

188

INVERSION OF CONVERTED-WAVE SEISMIC DATA FOR RESERVOIR CHARACTERIZATION  

E-Print Network [OSTI]

Basin of northwest Colorado. The reservoir consists of lenticular fluvial sands, shales, and coals, the Thomsen anisotropy parameters are es- timated at the UMV Shale interval from a joint PP/PS traveltime inversion. An anisotropic AVO modeling study based on the elastic parameters extracted at the study well

189

Refactoring Composite to Visitor and Inverse Transformation in Java  

E-Print Network [OSTI]

Refactoring Composite to Visitor and Inverse Transformation in Java Akram Ajouli1 & Julien Cohen2 1, EMN) We describe how to use refactoring tools to transform a Java program conforming to the Composite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 CompositeVisitor Transformation Scheme 7 3.1 CompositeVisitor Transformation

Paris-Sud XI, Université de

190

Refactoring Composite to Visitor and Inverse Transformation in Java  

E-Print Network [OSTI]

Refactoring Composite to Visitor and Inverse Transformation in Java Akram Ajouli1 & Julien Cohen2 1, EMN) We describe how to use refactoring tools to transform a Java program conforming to the Composite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 CompositeVisitor Transformation Scheme 7 3.1 CompositeVisitor Transformation

Paris-Sud XI, Université de

191

A Bayesian Analysis of Regularised Source Inversions in Gravitational Lensing  

SciTech Connect (OSTI)

Strong gravitational lens systems with extended sources are of special interest because they provide additional constraints on the models of the lens systems. To use a gravitational lens system for measuring the Hubble constant, one would need to determine the lens potential and the source intensity distribution simultaneously. A linear inversion method to reconstruct a pixellated source distribution of a given lens potential model was introduced by Warren and Dye. In the inversion process, a regularization on the source intensity is often needed to ensure a successful inversion with a faithful resulting source. In this paper, we use Bayesian analysis to determine the optimal regularization constant (strength of regularization) of a given form of regularization and to objectively choose the optimal form of regularization given a selection of regularizations. We consider and compare quantitatively three different forms of regularization previously described in the literature for source inversions in gravitational lensing: zeroth-order, gradient and curvature. We use simulated data with the exact lens potential to demonstrate the method. We find that the preferred form of regularization depends on the nature of the source distribution.

Suyu, Sherry H.; /Caltech /KIPAC, Menlo Park; Marshall, P.J.; /KIPAC, Menlo Park; Hobson, M.P.; /Cambridge U., Inst. of Astron.; Blandford, R.D.; /Caltech /KIPAC, Menlo

2006-01-25T23:59:59.000Z

192

Fast Vectorless Power Grid Verification Using an Approximate Inverse Technique  

E-Print Network [OSTI]

Fast Vectorless Power Grid Verification Using an Approximate Inverse Technique Nahi H. Abdul Ghani Department of ECE University of Toronto Toronto, Ontario, Canada f.najm@utoronto.ca ABSTRACT Power grid Aids General Terms Performance, Algorithms, Verification Keywords Power grid, voltage drop, approximate

Najm, Farid N.

193

HYBRID INVERSE PROBLEMS AND REDUNDANT SYSTEMS OF PARTIAL DIFFERENTIAL EQUATIONS  

E-Print Network [OSTI]

. The theory is applied to the case of power density measurements, which are internal functionals of the form from knowledge of said internal functionals. For recent books and reviews on hybrid inverse problems conditions. General theories of elliptic systems then allow us to construct a parametrix for such systems

Bal, Guillaume

194

An inverse random source problem for the Helmholtz equation  

E-Print Network [OSTI]

Jun 10, 2013 ... see e.g., Devaney, Marengo, and Li [13], Eller and Valdivia [15], and the references cited therein. ... See also Gelfand and Levitan [16] for a related inverse Sturm. Liouville ...... MR2443008 (2010b:35508). [7] Guillaume Bal...

Gang Bao; Shui-Nee Chow; Peijun Li; Haomin Zhou

2013-10-25T23:59:59.000Z

195

Inverse Scattering and Acousto-Optic Imaging Guillaume Bal  

E-Print Network [OSTI]

Inverse Scattering and Acousto-Optic Imaging Guillaume Bal Department of Applied Physics the optical properties of a highly-scattering medium from incoherent acousto-optic measurements. The method of interior control of boundary measurements by an external wave field. 1 #12;The acousto-optic effect

Bal, Guillaume

196

Nonlinear Adaptive Dynamic Inversion Applied to a Generic Hypersonic Vehicle  

E-Print Network [OSTI]

Nonlinear Adaptive Dynamic Inversion Applied to a Generic Hypersonic Vehicle Elizabeth Rollins Conclusions Extensions 3 / 50 #12;Motivation Control of Hypersonic Vehicles · Wide range of flight conditions in hypersonic flight · Three main causes of inlet unstarts: 1 A flow to the inlet that is slower than

Valasek, John

197

Nonlinear Adaptive Dynamic Inversion Applied to a Generic Hypersonic Vehicle  

E-Print Network [OSTI]

Nonlinear Adaptive Dynamic Inversion Applied to a Generic Hypersonic Vehicle Elizabeth Rollins of hypersonic vehicles is challenging because of the wide range of oper- ating conditions encountered and certain aspects unique to high speed flight. A particular safety concern in hypersonic flight is the risk

Valasek, John

198

Ocean effect correction in global inversion of geomagnetic  

E-Print Network [OSTI]

data: dcorr = dobs ­ ( F(mi) ­ F'(mi) ) ·invert corrected data: mi+1 = F'-1 (dcorr ) ·repeat until |mi+1 - mi | mi+1 ­ mi = F'-1 ( dobs ­ F(mi) ) ·then if mi+1 ­ mi 0, also mi F-1 (dobs ) Inverse problem with an approximate forward operator #12

Cerveny, Vlastislav

199

Inversion of Scattered Waves for Material Properties in Fractured Rock  

SciTech Connect (OSTI)

The authors apply a recently developed low-frequency, non-linear inversion method which includes near and far field terms to a crosshole data set to determine the bulk and shear modulus, as well as the density for a fractured zone in a granitic rock mass. The method uses the scattered elastic wavefield which is extracted from the recorded data before the inversion is performed. The inversion result is appraised by investigating the resolution and standard deviation of the model estimates. The sensitivity of the three parameters to different features of the medium is revealed. While the bulk modulus appears to be sensitive to voids and welded contacts, the density is mostly affected by fractured zones. The shear modulus is least constrained due to the absence of S wave anisotropy information. It is shown that the three medium parameters are generally sensitive to other medium features than those determined by velocity inversions. Thus this method is viewed as a complimentary approach to travel time tomography which provides more insight into the material properties of inhomogeneous media.

Gritto, Roland; Korneev, Valeri A.; Johnson, Lane R.

1999-07-01T23:59:59.000Z

200

Inversion of borehole weak motion records observed in Istanbul (Turkey)  

Science Journals Connector (OSTI)

......sets, might be large. This indicates...the inversion of borehole weak and strong...2005 December, a drilling program consisting...the 140-m-deep borehole, based on the encountered...applicable also to borehole sites where other...velocities (with a large change of impedance......

S. Parolai; R. Wang; D. Bindi

2012-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Sensitivity and inversion of borehole flexural dispersions for formation parameters  

Science Journals Connector (OSTI)

......any constraints for a Gaussian random process is given by Figure 1. Schematic diagram...waveforms. Nevertheless, the inversion process tolerates a 10 per cent uncertainty in...waves, presented at 66th Ann. Int. Mtg, Soc. Expl. Geophys., Denver, CO......

Bikash K. Sinha

1997-01-01T23:59:59.000Z

202

Inverse scattering for rotationally scanned optical coherence tomography  

E-Print Network [OSTI]

Inverse scattering for rotationally scanned optical coherence tomography Daniel L. Marks, Tyler S May 16, 2006; posted May 26, 2006 (Doc. ID 67358) Optical coherence tomography of luminal structures coherence tomography1,2 (OCT), is determined in large part by the degree to which the images provide

Bhargava, Rohit

203

The Laplace Transform 1 Laplace transform and inverse transform  

E-Print Network [OSTI]

The Laplace Transform Name: 1 Laplace transform and inverse transform Definition. Let f(t) be a function defined for t 0. Then the integral L {f(t)} = 0 e-st f(t)dt is said to be the Laplace transform of f provided the integral converges. Fill in the following Laplace transforms. L {tn } = L {eat } = L

Yengulalp, Lynne

204

The Laplace Transform 1 Laplace transform and inverse transform  

E-Print Network [OSTI]

The Laplace Transform Name: 1 Laplace transform and inverse transform Definition. Let f be a function defined for t 0. Then the integral L {f(t)} = 0 e-st f(t)dt is said to be the Laplace transform of f provided the integral converges. Fill in the following Laplace transforms. L {tn } = n! sn+1 L

Yengulalp, Lynne

205

Variational Structure of Inverse Problems in Wave Propagation and Vibration  

E-Print Network [OSTI]

Variational Structure of Inverse Problems in Wave Propagation and Vibration James G. Berryman in wave propagation (traveltime tomography) and two examples in vibration (the plucked string and free.'' For vibrating systems, the apparently very complex behavior of an excited string, drumhead, or the Earth can

206

Time-lapse gravity inversion with an active time constraint  

Science Journals Connector (OSTI)

......volcanic activity and geothermal fields (e.g...potential (potential energy per unit mass...the computational cost of the inversion...funding from DOE (Geothermal Technology Advancement...the CO2 plume. Energy Proc. (2011...ground water flow in geothermal fields. J. geophys......

M. Karaoulis; A. Revil; B. Minsley; M. Todesco; J. Zhang; D.D. Werkema

2014-01-01T23:59:59.000Z

207

Time-lapse gravity inversion with an active time constraint  

Science Journals Connector (OSTI)

......J. Zhang 1 D.D. Werkema 5 1 Department of Geophysics, Colorado School of Mines, Golden, CO 80401, USA. E-mail: arevil...We applied the time-lapse inversion algorithm to a water-flood and secondary oil recovery experiment in which water was injected......

M. Karaoulis; A. Revil; B. Minsley; M. Todesco; J. Zhang; D.D. Werkema

2014-01-01T23:59:59.000Z

208

Motion Without Correspondence from Tomographic Projections by Bayesian Inversion Theory  

E-Print Network [OSTI]

Computing 3D reconstructions from X-ray projections is al- ready possible in some medical applications by Bayesian formalism as we want to handle either sparsely collected or limited-angle data, which are beyondMotion Without Correspondence from Tomographic Projections by Bayesian Inversion Theory S. S

Brandt, Sami

209

Reverse Audio Engineering: Model-Based Inversion of Dynamic Range  

E-Print Network [OSTI]

1 Reverse Audio Engineering: Model-Based Inversion of Dynamic Range Compression Stanislaw Gorlow, Graduate Student Member, IEEE and Joshua D. Reiss, Member, IEEE Abstract--Reverse audio engineering so far, reverse audio engineering. I. INTRODUCTION SOUND or audio engineering is an established discipline

210

THE INVERSE OF A SEMI-INFINITE SYMMETRIC BANDED MATRIX  

E-Print Network [OSTI]

algorithm 3]. The eigen- values and eigen-vectors for the nite symmetric tridiagonal case were obtainedTHE INVERSE OF A SEMI-INFINITE SYMMETRIC BANDED MATRIX D. A. LAVISy , B. W. SOUTHERNz and I. F a method for obtaining an analytic form for a class of sym- metric semi-in nite banded matrices, which are

Lavis, David

211

Mesozoic tectonic inversion in the Neuquen Basin of west-central Argentina  

E-Print Network [OSTI]

Mesozoic tectonic inversion in the Neuquen Basin of west-central Argentina produced two main fault systems: (1) deep faults that affected basement and syn-rift strata where preexisting faults were selectively reactivated during inversion based...

Grimaldi Castro, Gabriel Orlando

2007-04-25T23:59:59.000Z

212

Time-lapse Joint Inversion of Geophysical Data and its Applications...  

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

Objectives of the project * Forward modeling geophysical response with fluid flowheat modeling * Joint inversion (stochasticdeterministic) for ground water flow imaging *...

213

DIRECT SOLUTION OF THE INVERSE STOCHASTIC PROBLEM THROUGH ELEMENTARY MARKOV STATE DISAGGREGATION  

E-Print Network [OSTI]

matrix, inverse eigenvalue problem, state disaggregation. AMS subject classifications. 65F18, 15B51, 15A

Boyer, Edmond

214

EXPERIMENTAL STUDY OF AXISYMMETRIC INSTABILITY OF INVERSE DEE AND SQUARE TOKAMAK EQUILIBRIA  

E-Print Network [OSTI]

EXPERIMENTAL STUDY OF AXISYMMETRIC INSTABILITY OF INVERSE DEE AND SQUARE TOKAMAK EQUILIBRIA COO Study ofAxi.symmetric !nsta bUity of Inverse Dee and Square Tokamak Equilibria B. Lipschultz, S as a function of time in a tokamak with a 4-null poloidal d ivertor. Inverse dee equilibria are observed

Sprott, Julien Clinton

215

PARTICLE FILTER BASED MULTI-SENSOR FUSION FOR SOLVING LOW FREQUENCY ELECTROMAGNETIC NDE INVERSE PROBLEMS  

E-Print Network [OSTI]

PARTICLE FILTER BASED MULTI-SENSOR FUSION FOR SOLVING LOW FREQUENCY ELECTROMAGNETIC NDE INVERSE 48824 khantari,sdass@msu.edu, r.pradeep@ieee.org Abstract: Flaw profile characterization from NDE from multi-sensor data is considered. The NDE inverse problem is posed as a statistical inverse problem

Dass, Sarat C.

216

Inverse free electron laser accelerator for advanced light sources  

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

We discuss the inverse free electron laser (IFEL) scheme as a compact high gradient accelerator solution for driving advanced light sources such as a soft x-ray free electron laser amplifier or an inverse Compton scattering based gamma-ray source. In particular, we present a series of new developments aimed at improving the design of future IFEL accelerators. These include a new procedure to optimize the choice of the undulator tapering, a new concept for prebunching which greatly improves the fraction of trapped particles and the final energy spread, and a self-consistent study of beam loading effects which leads to an energy-efficient high laser-to-beam power conversion.

Duris, J. P.; Musumeci, P.; Li, R. K.

2012-06-01T23:59:59.000Z

217

Evolving Design Rules for the Inverse Granular Packing Problem  

E-Print Network [OSTI]

If a collection of identical particles is poured into a container, different shapes will fill to different densities. But what is the shape that fills a container as close as possible to a pre-specified, desired density? We demonstrate a solution to this inverse-packing problem by framing it in the context of artificial evolution. By representing shapes as bonded spheres, we show how shapes may be mutated, simulated, and selected to produce particularly dense or loose packing aggregates, both with and without friction. Moreover, we show how motifs emerge linking these shapes together. The result is a set of design rules that function as an effective solution to the inverse packing problem for given packing procedures and boundary conditions. Finally, we show that these results are verified by experiments on 3D-printed prototypes used to make packings in the real world.

Marc Z. Miskin; Heinrich M. Jaeger

2014-03-17T23:59:59.000Z

218

A RANK FOR RIGHT CONGRUENCES ON INVERSE VICTORIA GOULD  

E-Print Network [OSTI]

A RANK FOR RIGHT CONGRUENCES ON INVERSE SEMIGROUPS VICTORIA GOULD Abstract. The sandwich rank, or S­rank, of a right congruence # on a semi­ group S is the Cantor­Bendixson rank of # in the lattice of right congruences RC of S with respect to a topology we call the finite type topology. If ev­ ery # # RC possesses S­rank

Gould, Victoria

219

Assessment of 2D resistivity structures using 1D inversions  

E-Print Network [OSTI]

) E. R. Hoskins (Head of Departsnent) May 1987 ABSTRACT Assessment of 2D Resistivity Structures Using 1D Inversion. (May 1987) Les Paul Beard, B. S. , East Texas State University Chairman of Advisory Committee: Dr. Frank Dale Morgan Resistivity... sections from Schlumberger soundings over and near normal fault. 4. 11 Inverted sections from Wenner soundings over and near nornral fault 4. 12 Schlumberger apparent resistivity contour for normal fault 4. 13 Wenner apparenl resistivity contour...

Beard, Les Paul

1987-01-01T23:59:59.000Z

220

Combined approach to the inverse protein folding problem. Final report  

SciTech Connect (OSTI)

The main scientific contribution of the project ''Combined approach to the inverse protein folding problem'' submitted in 1996 and funded by the Department of Energy in 1997 is the formulation and development of the idea of the multilink recognition method for identification of functional and structural homologues of newly discovered genes. This idea became very popular after they first announced it and used it in prediction of the threading targets for the CASP2 competition (Critical Assessment of Structure Prediction).

Ruben A. Abagyan

2000-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

THE INVERSE OF A SYMMETRIC BANDED TOEPLITZ MATRIX  

E-Print Network [OSTI]

matrices the inverse can be computed numerically using the Trench algorithm 3]. The eigen- values and eigen ::: 2n: (10) It is then not di cult to show that the eigen-values of T are the roots k, ;1 k , k = 1 A has elements As j with the property As j = a(s ; j). In the case of semi-in nite matrices (s j = 0 1

Lavis, David

222

Inversion of reverberation data for rapid environmental assessment  

Science Journals Connector (OSTI)

From 1996 through 1998 SACLANTCEN participated in three rapid environmental assessment (REA) trials including experiments for bottom reverberation. Eight sites were visited: near Sicily in the Ionian Sea and near the Straits of Gibraltar. SUS charges were used as sources. The receivers were horizontal arrays (four apertures) spanning a wide frequency range. Sets of nearly monostatic recordings were analyzed in frequency bands from 80 to 4000 Hz. Previous results by the author [Berlin ASA meeting (1999)] showed polar plots of the beam time series superimposed on bathymetric charts revealing a number of scattering features not on the charts and that directional reverberation measurements are a useful remote?sensing tool. Another objective of the reverberation experiments was to quickly invert for estimates of scattering and geo?acoustic parameters that can be used in a wider variety of conditions. A manual inversion procedure was originally used to obtain at?sea results. New work uses a simulated annealing algorithm giving more formal inversion results. The horizontal array data are compared with the generic sonar model (GSM) predictions for both the manual and automated inverse schemes. A summary of the estimated geo?acoustic parameters using both methods is presented. [Work supported by ONR and DREA.

John R. Preston

2000-01-01T23:59:59.000Z

223

Harmonic inversion analysis of exceptional points in resonance spectra  

E-Print Network [OSTI]

The spectra of, e.g. open quantum systems are typically given as the superposition of resonances with a Lorentzian line shape, where each resonance is related to a simple pole in the complex energy domain. However, at exceptional points two or more resonances are degenerate and the resulting non-Lorentzian line shapes are related to higher order poles in the complex energy domain. In the Fourier-transform time domain an $n$-th order exceptional point is characterised by a non-exponentially decaying time signal given as the product of an exponential function and a polynomial of degree $n-1$. The complex positions and amplitudes of the non-degenerate resonances can be determined with high accuracy by application of the nonlinear harmonic inversion method to the real-valued resonance spectra. We extend the harmonic inversion method to include the analysis of exceptional points. The technique yields, in the energy domain, the amplitudes of the higher order poles contributing to the spectra, and, in the time domain, the coefficients of the polynomial characterising the non-exponential decay of the time signal. The extended harmonic inversion method is demonstrated on two examples, viz. the analysis of exceptional points in resonance spectra of the hydrogen atom in crossed magnetic and electric fields, and an exceptional point occurring in the dynamics of a single particle in a time-dependent harmonic trap.

Jacob Fuchs; Jrg Main; Holger Cartarius; Gnter Wunner

2014-02-17T23:59:59.000Z

224

Final Technical Report for "Applied Mathematics Research: Simulation Based Optimization and Application to Electromagnetic Inverse Problems"  

SciTech Connect (OSTI)

The focus of research was: Developing adaptive mesh for the solution of Maxwell's equations; Developing a parallel framework for time dependent inverse Maxwell's equations; Developing multilevel methods for optimization problems with inequal- ity constraints; A new inversion code for inverse Maxwell's equations in the 0th frequency (DC resistivity); A new inversion code for inverse Maxwell's equations in low frequency regime. Although the research concentrated on electromagnetic forward and in- verse problems the results of the research was applied to the problem of image registration.

Haber, Eldad

2014-03-17T23:59:59.000Z

225

Globally strongly convex cost functional for a coefficient inverse problem  

E-Print Network [OSTI]

A Carleman Weight Function (CWF) is used to construct a new cost functional for a Coefficient Inverse Problems for a hyperbolic PDE. Given a bounded set of an arbitrary size in a certain Sobolev space, one can choose the parameter of the CWF in such a way that the constructed cost functional will be strongly convex on that set. Next, convergence of the gradient method, which starts from an arbitrary point of that set, is established. Since restrictions on the size of that set are not imposed, then this is the global convergence.

Larisa Beilina; Michael V. Klibanov

2013-12-10T23:59:59.000Z

226

Nonlinear inverse perturbation in structural dynamics redesign of risers  

SciTech Connect (OSTI)

Marine risers, and offshore structures in general, may have undesirable natural frequencies and/or mode shapes. Structural redesign is mandatory in such cases. An Inverse Perturbation Redesign (IPR) method, which uses only the finite element analysis of the baseline system and was developed in previous work for general structures, is extended in this work to handle systems with geometric stiffness matrices like marine risers. The IPR method is currently applicable to undamped structural systems or systems with Rayleigh damping and is valid for large or small changes which are frequently required to change modal characteristics of offshore structures.

Bernitsas, M.M.; Hoff, C.J.; Kokara kis, J.E.

1985-06-01T23:59:59.000Z

227

Finite Rank Perturbations, Scattering Matrices and Inverse Problems  

E-Print Network [OSTI]

In this paper the scattering matrix of a scattering system consisting of two selfadjoint operators with finite dimensional resolvent difference is expressed in terms of a matrix Nevanlinna function. The problem is embedded into an extension theoretic framework and the theory of boundary triplets and associated Weyl functions for (in general nondensely defined) symmetric operators is applied. The representation results are extended to dissipative scattering systems and an explicit solution of an inverse scattering problem for the Lax-Phillips scattering matrix is presented.

Jussi Behrndt; Mark M. Malamud; Hagen Neidhardt

2009-02-20T23:59:59.000Z

228

Seismic Attenuation Inversion with t* Using tstarTomog.  

SciTech Connect (OSTI)

Seismic attenuation is defined as the loss of the seismic wave amplitude as the wave propagates excluding losses strictly due to geometric spreading. Information gleaned from seismic waves can be utilized to solve for the attenuation properties of the earth. One method of solving for earth attenuation properties is called t*. This report will start by introducing the basic theory behind t* and delve into inverse theory as it pertains to how the algorithm called tstarTomog inverts for attenuation properties using t* observations. This report also describes how to use the tstarTomog package to go from observed data to a 3-D model of attenuation structure in the earth.

Preston, Leiph

2014-09-01T23:59:59.000Z

229

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

230

Nonmetallic Conduction in Electron Inversion Layers at Low Temperatures  

Science Journals Connector (OSTI)

We have measured the resistance of electron inversion layers in Si metal-oxide-semiconductor field-effect transistors at low temperatures (?50 mK) and low electric fields (?0.1 V/m). At low values of R? we observe logarithmic dependences of the resistance on both temperature and applied electric field which scale only on R?. We observe a gradual transition to an exponential dependence at R??10 k?. The logarithmic dependences agree qualitatively but not quantitatively with current theories of localization.

D. J. Bishop, D. C. Tsui, and R. C. Dynes

1980-04-28T23:59:59.000Z

231

Negative Compressibility and Inverse Problem for Spinning Gas  

SciTech Connect (OSTI)

A spinning ideal gas in a cylinder with a smooth surface is shown to have unusual properties. First, under compression parallel to the axis of rotation, the spinning gas exhibits negative compressibility because energy can be stored in the rotation. Second, the spinning breaks the symmetry under which partial pressures of a mixture of gases simply add proportional to the constituent number densities. Thus, remarkably, in a mixture of spinning gases, an inverse problem can be formulated such that the gas constituents can be determined through external measurements only.

Vasily Geyko and Nathaniel J. Fisch

2013-01-11T23:59:59.000Z

232

Threshold Law for Attractive Inverse-Cube Interactions  

Science Journals Connector (OSTI)

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

Tim-Oliver Mller

2013-06-24T23:59:59.000Z

233

Solution accelerators for large scale 3D electromagnetic inverse problems  

SciTech Connect (OSTI)

We provide a framework for preconditioning nonlinear 3D electromagnetic inverse scattering problems using nonlinear conjugate gradient (NLCG) and limited memory (LM) quasi-Newton methods. Key to our approach is the use of an approximate adjoint method that allows for an economical approximation of the Hessian that is updated at each inversion iteration. Using this approximate Hessian as a preconditoner, we show that the preconditioned NLCG iteration converges significantly faster than the non-preconditioned iteration, as well as converging to a data misfit level below that observed for the non-preconditioned method. Similar conclusions are also observed for the LM iteration; preconditioned with the approximate Hessian, the LM iteration converges faster than the non-preconditioned version. At this time, however, we see little difference between the convergence performance of the preconditioned LM scheme and the preconditioned NLCG scheme. A possible reason for this outcome is the behavior of the line search within the LM iteration. It was anticipated that, near convergence, a step size of one would be approached, but what was observed, instead, were step lengths that were nowhere near one. We provide some insights into the reasons for this behavior and suggest further research that may improve the performance of the LM methods.

Newman, Gregory A.; Boggs, Paul T.

2004-04-05T23:59:59.000Z

234

The inverse problems of wing panel manufacture processes  

SciTech Connect (OSTI)

It is shown that inverse problems of steady-state creep bending of plates in both the geometrically linear and nonlinear formulations can be represented in a variational formulation. Steady-state values of the obtained functionals corresponding to the solutions of the problems of inelastic deformation and springback are determined by applying a finite element procedure to the functionals. Optimal laws of creep deformation are formulated using the criterion of minimizing damage in the functionals of the inverse problems. The formulated problems are reduced to the problems solved by the finite element method using MSC.Marc software. Currently, forming of light metals poses tremendous challenges due to their low ductility at room temperature and their unusual deformation characteristics at hot-cold work: strong asymmetry between tensile and compressive behavior, and a very pronounced anisotropy. We used the constitutive models of steady-state creep of initially transverse isotropy structural materials the kind of the stress state has influence. The paper gives basics of the developed computer-aided system of design, modeling, and electronic simulation targeting the processes of manufacture of wing integral panels. The modeling results can be used to calculate the die tooling, determine the panel processibility, and control panel rejection in the course of forming.

Oleinikov, A. I., E-mail: a.i.oleinikov@mail.ru [Komsomolsk-on-Amur State Technical University, Lenina prospect 27, Komsomolsk-on-Amur, 681013, Russian Federation, and Institute of Machinery and Metallurgy Far Eastern Branch of the Russian Academy of Sciences, Metallurgov Street 1, Komsomolsk-on-Am (Russian Federation); Bormotin, K. S., E-mail: cvmi@knastu.ru [Komsomolsk-on-Amur State Technical University, Lenina prospect 27, Komsomolsk-on-Amur, 681013, Russian Federation (Russian Federation)

2013-12-16T23:59:59.000Z

235

Zenith Radiance Retrieval of Cloud Properties  

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

retrievals of cloud properties retrievals of cloud properties from the AMF/COPS campaign Preliminary retrievals of cloud properties from the AMF/COPS campaign Christine Chiu, UMBC/JCET Alexander Marshak, GSFC Yuri Knyazikhin, Boston University Warren Wiscombe, GSFC Christine Chiu, UMBC/JCET Alexander Marshak, GSFC Yuri Knyazikhin, Boston University Warren Wiscombe, GSFC The cloud optical properties of interest are: The cloud optical properties of interest are: * Cloud optical depth τ - the great unknown * Radiative cloud fraction * Cloud effective drop size, r eff * Cloud optical depth τ - the great unknown * Radiative cloud fraction * Cloud effective drop size, r eff τ = 3 2 LWP r eff r eff in μm, LWP in g/m 2 The 2-ch narrow-field-of-view radiometer (2NFOV) The 2-ch narrow-field-of-view radiometer

236

Modelling TOVS radiances of synoptic systems  

E-Print Network [OSTI]

results. Experiment compared brightness ~tures of standard soundings run through the RII4 to the same soundings run through the RII4 after the lowest two layers (65 and 66) were artificially set to zero . . . . . . . . . . . . . . . . . . . . . 27 5 5... RII4 "no moisture" experiment results. Experiment cxxnpared brightness ~tures of a sounding run ~ the RIM to the same ~sxling run through the RII4 after all relative humi- dity values had been set to 0. 1 percent ~ , . . . . . ~ ~ . . . . . . 28 6...

Coe, Thomas Eddy

2012-06-07T23:59:59.000Z

237

Application Of 3D Inversion To Magnetotelluric Data In The Ogiri Geothermal  

Open Energy Info (EERE)

Of 3D Inversion To Magnetotelluric Data In The Ogiri Geothermal Of 3D Inversion To Magnetotelluric Data In The Ogiri Geothermal Area, Japan Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Application Of 3D Inversion To Magnetotelluric Data In The Ogiri Geothermal Area, Japan Details Activities (0) Areas (0) Regions (0) Abstract: A stable inversion technique has been developed for threedimensional (3D) interpretation of magnetotelluric (MT) data. The inversion method is based on the Gauss-Newton (linearized least-squares) method with smoothness regularization. Static shifts are also treated as unknown parameters in the inversion. The forward modeling is done by using the staggered-grid finite difference method. A Bayesian criterion ABIC is applied to searching for the optimum trade-off among the minimization of

238

Inverse deuterium isotope effect in the intersystem crossing of diphenylcarbene. Report for 1984-1985  

SciTech Connect (OSTI)

The singlet-to-triplet intersystem crossing rate k/sub ST/ of diphenylcarbene (DPC) is found to exhibit an inverse isotope effect in various solvents. An off-resonance coupling model between the initial singlet state and a sparse triplet vibronic manifold accounts for k/sub ST/ showing both an inverse isotope effect in a given solvent as well as an inverse energy gap effect in a solvent series.

Langan, J.G.; Sitzmann, E.V.; Eisenthal, K.B.

1986-02-07T23:59:59.000Z

239

Uniqueness and partial identification in a geometric inverse problem for the Boussinesq system .  

E-Print Network [OSTI]

??We analyze the inverse problem of the identification of a rigid body immersed in a fluid governed by the stationary Boussinesq system. First, we establish (more)

Doubova, Anna

2006-01-01T23:59:59.000Z

240

E-Print Network 3.0 - alpha inverse agonist Sample Search Results  

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

an inverse... . - Adrenoceptor agonists have been used to treat asthma for more than a century. The mechanisms of action of 2... -adrenoceptor agonists are well characterized...

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Submillimeter Test of the Gravitational Inverse-Square Law Using a Superconducting Differential Accelerometer .  

E-Print Network [OSTI]

??The inverse-square law of gravitation is tested at submillimeter distances. To minimize Newtonian errors, the experiment employs a near null source, a circular disk of (more)

Prieto, Violeta A

2007-01-01T23:59:59.000Z

242

E-Print Network 3.0 - all-optical inverse compton Sample Search...  

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

the proton Summary: :00 Fujiwara: Science Facilities with Inverse Compton Photon beam in Japan and their new developments 11... Workshop will be held in Physics Astronomy...

243

SciTech Connect: Entropy-Bayesian Inversion of Time-Lapse Tomographic...  

Office of Scientific and Technical Information (OSTI)

the Bayesian estimates from the previous inversion (as a memory function) with new data. The memory function and pilot point design takes advantage of the spatial-temporal...

244

Integration of Noise and Coda Correlation Data into Kinematic and Waveform Inversions  

Broader source: Energy.gov [DOE]

Integration of Noise and Coda Correlation Data into Kinematic and Waveform Inversions presentation at the April 2013 peer review meeting held in Denver, Colorado.

245

Sub-millimeter tests of the gravitational inverse-square law.  

E-Print Network [OSTI]

??The Newtonian Law of Universal Gravitation states that the strength of the gravitational force between point test bodies falls as the inverse-square of the distance (more)

Hoyle, Charles D., 1974-

2001-01-01T23:59:59.000Z

246

figures for inverse problem paper in 3d - Department of Mathematics ...  

E-Print Network [OSTI]

FIGURES FOR INVERSE PROBLEM PAPER IN 3D. JUAN E. SANTOS. Departamento de Geof sica Aplicada, Facultad de Ciencias Astron omicas y Geof sicas,.

santos

1910-20-20T23:59:59.000Z

247

Time-lapse Joint Inversion of Geophysical Data and its Applications to Geothermal Prospecting  

Broader source: Energy.gov [DOE]

Time-lapse Joint Inversion of Geophysical Data and its Applications to Geothermal Prospecting presentation at the April 2013 peer review meeting held in Denver, Colorado.

248

Feasibility of UV lasing without inversion in mercury vapor  

E-Print Network [OSTI]

We investigate the feasibility of UV lasing without inversion at a wavelength of $253.7$ nm utilizing interacting dark resonances in mercury vapor. Our theoretical analysis starts with radiation damped optical Bloch equations for all relevant 13 atomic levels. These master equations are generalized by considering technical phase noise of the driving lasers. From the Doppler broadened complex susceptibility we obtain the stationary output power from semiclassical laser theory. The finite overlap of the driving Gaussian laser beams defines an ellipsoidal inhomogeneous gain distribution. Therefore, we evaluate the intra-cavity field inside a ring laser self-consistently with Fourier optics. This analysis confirms the feasibility of UV lasing and reveals its dependence on experimental parameters.

Martin R. Sturm; Benjamin Rein; Thomas Walther; Reinhold Walser

2014-06-27T23:59:59.000Z

249

Inverse time-of-flight spectrometer for beam plasma research  

Science Journals Connector (OSTI)

The paper describes the design and principle of operation of an inverse time-of-flight spectrometer for research in the plasma produced by an electron beam in the forevacuum pressure range (520 Pa). In the spectrometer the deflecting plates as well as the drift tube and the primary ion beam measuring system are at high potential with respect to ground. This provides the possibility to measure the mass-charge constitution of the plasma created by a continuous electron beam with a current of up to 300 mA and electron energy of up to 20 keV at forevacuum pressures in the chamber placed at ground potential. Research results on the mass-charge state of the beam plasma are presented and analyzed.

A. V. Tyunkov; K. P. Savkin

2014-01-01T23:59:59.000Z

250

Chirped pulse inverse free-electron laser vacuum accelerator  

DOE Patents [OSTI]

A chirped pulse inverse free-electron laser (IFEL) vacuum accelerator for high gradient laser acceleration in vacuum. By the use of an ultrashort (femtosecond), ultrahigh intensity chirped laser pulse both the IFEL interaction bandwidth and accelerating gradient are increased, thus yielding large gains in a compact system. In addition, the IFEL resonance condition can be maintained throughout the interaction region by using a chirped drive laser wave. In addition, diffraction can be alleviated by taking advantage of the laser optical bandwidth with negative dispersion focusing optics to produce a chromatic line focus. The combination of these features results in a compact, efficient vacuum laser accelerator which finds many applications including high energy physics, compact table-top laser accelerator for medical imaging and therapy, material science, and basic physics.

Hartemann, Frederic V. (Dublin, CA); Baldis, Hector A. (Pleasanton, CA); Landahl, Eric C. (Walnut Creek, CA)

2002-01-01T23:59:59.000Z

251

The Inverse-Cube Central Force Field in Quantum Mechanics  

Science Journals Connector (OSTI)

The problem of the motion of a particle in an inverse-cube central force field is fully treated by quantum mechanics and the results compared with the classical theory. Taking the effective radial potential energy as Sr2, although the solutions for negative energy for 0?S?-h232?2? satisfy the usual boundary conditions, they can not be admitted because the Hamiltonian is not Hermitian in these solutions. This corresponds to taking (l+12)2 in place of l(l+1) as the analogue of the square of the classical angular momentum. If we do this, we get a complete analogy between the classical and quantum mechanically allowed solutions, with no quantization. The solutions involve Bessel functions of both real and imaginary orders with both real and imaginary arguments.

George H. Shortley

1931-07-01T23:59:59.000Z

252

Inverse bremsstrahlung heating rate for dense plasmas in laser fields  

SciTech Connect (OSTI)

We report a theoretical analysis of inverse bremsstrahlung heating rate in the eikonal approximation. The present analysis is performed for a dense plasma using the screened electron-ion interaction potential for the ion charge state Z{sub i} = 1 and for both the weak and strong plasma screening cases. We have also compared the eikonal results with the first Born approximation (FBA) [M. Moll et al., New J. Phys. 14, 065010 (2012)] calculation. We find that the magnitudes of inverse bremsstrahlung heating rate within the eikonal approximation (EA) are larger than the FBA values in the weak screening case (? = 0.03 a.u.) in a wide range of field strength for three different initial electron momenta (2, 3, and 4 a.u.). But for strong screening case (? = 0.3 a.u.), the heating rates predicted by the two approximations do not differ much after reaching their maximum values. Furthermore, the individual contribution of photoemission and photoabsorption processes to heating rate is analysed for both the weak and strong screening cases. We find that the single photoemission and photoabsorption rates are the same throughout the field strength while the multiphoton absorption process dominates over the multiphoton emission process beyond the field strength ? 410{sup 8} V/cm. The present study of the dependence of heating rate on the screening parameter ranging from 0.01 to 20 shows that whereas the heating rate predicted by the EA is greater than the FBA up to the screening parameter ? = 0.3 a.u., the two approximation methods yield results which are nearly identical beyond the above value.

Dey, R. [D-203, Samruddhi Residency, Motera, Ahmedabad-380009, Gujarat (India)] [D-203, Samruddhi Residency, Motera, Ahmedabad-380009, Gujarat (India); Roy, A. C. [School of Mathematical Sciences, Ramakrishna Mission Vivekananda University, Belur Math 711202, West Bengal (India)] [School of Mathematical Sciences, Ramakrishna Mission Vivekananda University, Belur Math 711202, West Bengal (India)

2013-07-15T23:59:59.000Z

253

Atmospheric Inverse Estimates of Methane Emissions from Central California  

SciTech Connect (OSTI)

Methane mixing ratios measured at a tall-tower are compared to model predictions to estimate surface emissions of CH{sub 4} in Central California for October-December 2007 using an inverse technique. Predicted CH{sub 4} mixing ratios are calculated based on spatially resolved a priori CH{sub 4} emissions and simulated atmospheric trajectories. The atmospheric trajectories, along with surface footprints, are computed using the Weather Research and Forecast (WRF) coupled to the Stochastic Time-Inverted Lagrangian Transport (STILT) model. An uncertainty analysis is performed to provide quantitative uncertainties in estimated CH{sub 4} emissions. Three inverse model estimates of CH{sub 4} emissions are reported. First, linear regressions of modeled and measured CH{sub 4} mixing ratios obtain slopes of 0.73 {+-} 0.11 and 1.09 {+-} 0.14 using California specific and Edgar 3.2 emission maps respectively, suggesting that actual CH{sub 4} emissions were about 37 {+-} 21% higher than California specific inventory estimates. Second, a Bayesian 'source' analysis suggests that livestock emissions are 63 {+-} 22% higher than the a priori estimates. Third, a Bayesian 'region' analysis is carried out for CH{sub 4} emissions from 13 sub-regions, which shows that inventory CH{sub 4} emissions from the Central Valley are underestimated and uncertainties in CH{sub 4} emissions are reduced for sub-regions near the tower site, yielding best estimates of flux from those regions consistent with 'source' analysis results. The uncertainty reductions for regions near the tower indicate that a regional network of measurements will be necessary to provide accurate estimates of surface CH{sub 4} emissions for multiple regions.

Zhao, Chuanfeng; Andrews, Arlyn E.; Bianco, Laura; Eluszkiewicz, Janusz; Hirsch, Adam; MacDonald, Clinton; Nehrkorn, Thomas; Fischer, Marc L.

2008-11-21T23:59:59.000Z

254

The inverse scattering problem for a discrete Sturm-Liouville equation on the line  

SciTech Connect (OSTI)

This paper investigates the inverse scattering problem for a discrete Sturm-Liouville equation on the entire line with coefficients that stabilize to zero in one direction. We derive a necessary and a sufficient condition on the scattering data so that the inverse problem is uniquely solvable. Bibliography: 23 titles.

Khanmamedov, Agil Kh [Baku State University, Baku (Azerbaijan)

2011-07-31T23:59:59.000Z

255

Non-linear traveltime inversion for 3-D seismic tomography in strongly anisotropic media  

Science Journals Connector (OSTI)

......low velocity body (Shale 2) and produces many...of the non-linear anisotropic inversion, we obtained...high velocity body (Shale 1) and fails to indicate...low velocity block (Shale 2). By contrast...of the non-linear anisotropic inversion yields clear......

Bing Zhou; Stewart Greenhalgh

2008-01-01T23:59:59.000Z

256

Math. H110 Gauss-Jordan Inversion October 16, 1998 Prof. W. Kahan Page 1  

E-Print Network [OSTI]

Math. H110 Gauss-Jordan Inversion October 16, 1998 Prof. W. Kahan Page 1 Gauss-Jordan Inversion accurate on some machines, is based upon Gauss-Jordan Elimination, a process that resembles Gaussian purpose is twofold; first to explain how Gauss- Jordan Elimination works when pivotal exchanges

California at Berkeley, University of

257

PROGRESS ON A NEW EXPERIMENTAL TEST OF THE GRAVITATIONAL INVERSE-SQUARE LAW  

E-Print Network [OSTI]

1 PROGRESS ON A NEW EXPERIMENTAL TEST OF THE GRAVITATIONAL INVERSE-SQUARE LAW R.M. BONICALZI, P from an oscillating torsion-pendulum experiment searching for gravitational inverse square law Relativity, i.e. Newton's Law of Universal Gravitation. The experiment reported here is designed

Newman, Riley D.

258

An Ankle-Foot Prosthesis Emulator with Control of Plantarflexion and Inversion-Eversion Torques  

E-Print Network [OSTI]

An Ankle-Foot Prosthesis Emulator with Control of Plantarflexion and Inversion-Eversion Torques Steven H. Collins,1,2,, Myunghee Kim,1, Tianjian Chen1, and Tianyao Chen3 Abstract--Ankle inversion, in robotic devices could improve balance for people with amputation. We designed a tethered ankle

Collins, Steven H.

259

SO2 emissions and lifetimes: Estimates from inverse modeling using in situ and global, spacebased  

E-Print Network [OSTI]

SO2 emissions and lifetimes: Estimates from inverse modeling using in situ and global, spacebased 18 March 2011. [1] Topdown constraints on global sulfur dioxide (SO2) emissions are inferred through of GEOSChem for inversion of SO2 columns to emissions. The seasonal mean SO2 lifetime calculated with the GEOS

Martin, Randall

260

Inverting geodetic time series with a principal component analysis-based inversion method  

E-Print Network [OSTI]

Inverting geodetic time series with a principal component analysis-based inversion method A. P (2010), Inverting geodetic time series with a principal component analysis-based inversion method, J; Cohen, 1999]. This formulation is linear and easily inverted using standard algorithms. The distribution

Avouac, Jean-Philippe

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Volume Currents in Forward and Inverse MEG Simulations Using Realistic Head Models  

E-Print Network [OSTI]

Volume Currents in Forward and Inverse MEG Simulations Using Realistic Head Models Robert Van of magnetoencephalographic (MEG) forward or inverse sim­ ulations in realistic head models. We verify the accuracy, in an inhomogeneous, non­spherical realistic head model, the magnetic field normal to the MEG detector due to volume

Utah, University of

262

Proteome analysis of factor for inversion stimulation (Fis) overproduction in Escherichia coli  

E-Print Network [OSTI]

Proteome analysis of factor for inversion stimulation (Fis) overproduction in Escherichia coli The factor-for-inversion stimulation protein (Fis) is a global regulatory protein in Escherichia coliRNA promoter and enhances transcription 5- to 10-fold in vivo. Fis overexpression results in different effects

Chen, Wilfred

263

Lossy Electric Transmission Line Soft Fault Diagnosis: an Inverse Scattering Approach  

E-Print Network [OSTI]

1 Lossy Electric Transmission Line Soft Fault Diagnosis: an Inverse Scattering Approach Huaibin transmission lines is studied through the inverse scattering approach. The considered soft faults are modeled as continuous spatial variations of distributed characteristic parameters of transmission lines. The diagnosis

Paris-Sud XI, Université de

264

Partial and Full Inverse Compensation for Hysteresis in Smart Material Systems  

E-Print Network [OSTI]

Partial and Full Inverse Compensation for Hysteresis in Smart Material Systems Ralph C. Smith Chad Smart material transducers employing piezoceramic or magnetostrictive drive components typically exhibit and hysteresis in­ herent to the smart material components. The second technique employs a partial inverse

265

Automated Technique For Comparison Of Magnetic Field Inversion Lines With Filament Skeletons From The Solar Feature Catalogue  

Science Journals Connector (OSTI)

We present an automated technique for comparison of magnetic field inversion-line maps from SOHO/MDI magnetograms with solar ... component labelling are used to identify nearest inversion lines to filament skelet...

S. S. Ipson; V. V. Zharkova; S. Zharkov; A. K. Benkhalil; J. Aboudarham

2005-05-01T23:59:59.000Z

266

Solving Inverse Detection Problems Using Passive Radiation Signatures  

SciTech Connect (OSTI)

The ability to reconstruct an unknown radioactive object based on its passive gamma-ray and neutron signatures is very important in homeland security applications. Often in the analysis of unknown radioactive objects, for simplicity or speed or because there is no other information, they are modeled as spherically symmetric regardless of their actual geometry. In these presentation we discuss the accuracy and implications of this approximation for decay gamma rays and for neutron-induced gamma rays. We discuss an extension of spherical raytracing (for uncollided fluxes) that allows it to be used when the exterior shielding is flat or cylindrical. We revisit some early results in boundary perturbation theory, showing that the Roussopolos estimate is the correct one to use when the quantity of interest is the flux or leakage on the boundary. We apply boundary perturbation theory to problems in which spherically symmetric systems are perturbed in asymmetric nonspherical ways. We apply mesh adaptive direct search (MADS) algorithms to object reconstructions. We present a benchmark test set that may be used to quantitatively evaluate inverse detection methods.

Favorite, Jeffrey A. [Los Alamos National Laboratory; Armstrong, Jerawan C. [Los Alamos National Laboratory; Vaquer, Pablo A. [Los Alamos National Laboratory

2012-08-15T23:59:59.000Z

267

Direct and Inverse Cascades in the Wind-Driven Sea  

E-Print Network [OSTI]

We offer a new form for the S(nl) term in the Hasselmann kinetic equation for squared wave amplitudes of wind-driven gravity wave. This form of S(nl) makes possible to rewrite in differential form the conservation laws for energy, momentum, and wave action, and introduce their fluxes by a natural way. We show that the stationary kinetic equation has a family of exact Kolmogorov-type solutions governed by the fluxes of motion constants: wave action, energy, and momentum. The simple "local" model for S(nl) term that is equivalent to the "diffusion approximation" is studied in details. In this case, Kolmogorov spectra are found in the explicit form. We show that a general solution of the stationary kinetic equation behind the spectral peak is described by the Kolmogorov-type solution with frequency-dependent fluxes. The domains of "inverse cascade" and "direct cascade" can be separated by natural way. The spectrum in the universal domain is close to $\\omega^{-4}$.

Zakharov, Vladimir E

2015-01-01T23:59:59.000Z

268

Development of an Inverse Algorithm for Resonance Inspection  

SciTech Connect (OSTI)

Resonance inspection (RI), which employs the natural frequency spectra shift between the good and the anomalous part populations to detect defects, is a non-destructive evaluation (NDE) technique with many advantages such as low inspection cost, high testing speed, and broad applicability to structures with complex geometry compared to other contemporary NDE methods. It has already been widely used in the automobile industry for quality inspections of safety critical parts. Unlike some conventionally used NDE methods, the current RI technology is unable to provide details, i.e. location, dimension, or types, of the flaws for the discrepant parts. Such limitation severely hinders its wide spread applications and further development. In this study, an inverse RI algorithm based on maximum correlation function is proposed to quantify the location and size of flaws for a discrepant part. A dog-bone shaped stainless steel sample with and without controlled flaws are used for algorithm development and validation. The results show that multiple flaws can be accurately pinpointed back using the algorithms developed, and the prediction accuracy decreases with increasing flaw numbers and decreasing distance between flaws.

Lai, Canhai; Xu, Wei; Sun, Xin

2012-10-01T23:59:59.000Z

269

Inverse Cotton-Mouton effect of the Vacuum and of atomic sys-C. Rizzo1,2,3  

E-Print Network [OSTI]

epl draft Inverse Cotton-Mouton effect of the Vacuum and of atomic sys- tems C. Rizzo1,2,3 , A.mm.xx ­ Third pacs description Abstract. - In this letter we calculate the Inverse Cotton-Mouton Effect (ICME magnetic field and a powerful light source are necessary. One of these effects is the inverse Cotton

Boyer, Edmond

270

Velocity structure of upper-mantle transition zones beneath central Eurasia from seismic inversion using genetic algorithms  

Science Journals Connector (OSTI)

......inversion, 60th Ann. Internat. Mtg., Soc. Expl. Geophys...control the likelihood of this process. A posteriori probability density...affected) into the whole inversion process. Therefore, no genetic feature...inversion, 60th Ann. Internat. Mtg., Soc. Expl. Geophys......

Fernando A. Neves; Satish C. Singh; Keith F. Priestley

1996-06-01T23:59:59.000Z

271

A TEM study of inverse melting in Nb{sub 45}Cr{sub 55}  

SciTech Connect (OSTI)

Inverse melting of bcc Nb{sub 45}Cr{sub 55} is investigated using transmission electron microscopy, high-resolution TEM and electron diffraction. It is shown that the transformation to the amorphous phase initiates at the bcc grain boundaries. The transformation results in an increase in incoherence, evidenced by a loss of bend contours. Some anisotropy is found in the amorphous phase produced by inverse melting, which is associated in HRTEM with preferentially oriented but discontinuous and distorted fringes. The results are consistent with the production of an amorphous phase by inverse melting.

Sinkler, W.; Michaelsen, C.; Bormann, R. [GKSS Forschungszentrum, Geesthacht (Germany). Inst. for Materials Research

1996-12-31T23:59:59.000Z

272

Anomaly-free perturbations with inverse-volume and holonomy corrections in Loop Quantum Cosmology  

E-Print Network [OSTI]

This article addresses the issue of the closure of the algebra of constraints for generic (cosmological) perturbations when taking into account simultaneously the two main corrections of effective loop quantum cosmology, namely the holonomy and the inverse-volume terms. Previous works on either the holonomy or the inverse volume case are reviewed and generalized. In the inverse-volume case, we point out new possibilities. An anomaly-free solution including both corrections is found for perturbations, and the corresponding equations of motion are derived.

Thomas Cailleteau; Linda Linsefors; Aurelien Barrau

2014-03-04T23:59:59.000Z

273

Rayleigh scattering and nonlinear inversion of elastic waves  

SciTech Connect (OSTI)

Rayleigh scattering of elastic waves by an inclusion is investigated and the limitations determined. In the near field of the inhomogeneity, the scattered waves are up to a factor of 300 stronger than in the far field, excluding the application of the far field Rayleigh approximation for this range. The investigation of the relative error as a function of parameter perturbation shows a range of applicability broader than previously assumed, with errors of 37% and 17% for perturbations of {minus}100% and +100%, respectively. The validity range for the Rayleigh limit is controlled by large inequalities, and therefore, the exact limit is determined as a function of various parameter configurations, resulting in surprisingly high values of up to k{sub p}R = 0.9. The nonlinear scattering problem can be solved by inverting for equivalent source terms (moments) of the scatterer, before the elastic parameters are determined. The nonlinear dependence between the moments and the elastic parameters reveals a strong asymmetry around the origin, which will produce different results for weak scattering approximations depending on the sign of the anomaly. Numerical modeling of cross hole situations shows that near field terms are important to yield correct estimates of the inhomogeneities in the vicinity of the receivers, while a few well positioned sources and receivers considerably increase the angular coverage, and thus the model resolution of the inversion parameters. The pattern of scattered energy by an inhomogeneity is complicated and varies depending on the object, the wavelength of the incident wave, and the elastic parameters involved. Therefore, it is necessary to investigate the direction of scattered amplitudes to determine the best survey geometry.

Gritto, R.

1995-12-01T23:59:59.000Z

274

2D Joint Inversion Of Dc And Scalar Audio-Magnetotelluric Data In The  

Open Energy Info (EERE)

Joint Inversion Of Dc And Scalar Audio-Magnetotelluric Data In The Joint Inversion Of Dc And Scalar Audio-Magnetotelluric Data In The Evaluation Of Low Enthalpy Geothermal Fields Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: 2D Joint Inversion Of DC And Scalar Audio-Magnetotelluric Data In The Evaluation Of Low Enthalpy Geothermal Fields Details Activities (0) Areas (0) Regions (0) Abstract: Audio-magnetotelluric (AMT) and resistivity (dc) surveys are often used in environmental, hydrological and geothermal evaluation. The separate interpretation of those geophysical data sets assuming two-dimensional models frequently produces ambiguous results. The joint inversion of AMT and dc data is advocated by several authors as an efficient method for reducing the ambiguity inherent to each of those

275

Inverse natural convection problem of estimating wall heat flux using a moving sensor  

SciTech Connect (OSTI)

Inverse heat transfer problems have many applications in various branch of science and engineering. Here, the inverse problem of determining heat flux at the bottom wall of a two-dimensional cavity from temperature measurement in the domain is considered. The Boussinesq equation is used to model the natural convection induced by the wall heat flux. The inverse natural convection problem is posed as a minimization problem of the performance function, which is the sum of square residuals between calculated and observed temperature, by means of a conjugate gradient method. Instead of employing several fixed sensors, a single sensor is used which is moving at a given frequency over the bottom wall. The present method solves the inverse natural convection problem accurately without a priori information about the unknown function to be estimated.

Park, H.M.; Chung, O.Y.

1999-11-01T23:59:59.000Z

276

A parametrization study for surface seismic full waveform inversion in an acoustic vertical transversely isotropic medium  

Science Journals Connector (OSTI)

......acoustic wave equation for anisotropic media, Geophysics, 65...theory and modelling for anisotropic media, Geophys. J. Int...1984. Velocity anisotropy of shales and depth estimation in the...Feasibility study for an anisotropic full waveform inversion of......

R.-. Plessix; Q. Cao

2011-04-01T23:59:59.000Z

277

E-Print Network 3.0 - aerosol parameter inversion Sample Search...  

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

parameter inversion Page: << < 1 2 3 4 5 > >> 1 The Way Forward2 Authors: David Rind, NASA GISS; Ralph A. Kahn, NASA GSFC; Mian Chin, NASA3 Summary: ) hygroscopic growth, (f)...

278

Estimation of Impedance Using Seismic Reflection Data Based on Transdimensional Inversion  

E-Print Network [OSTI]

Deterministic seismic inversion can obtain optimal results when there is a linear relationship between data and model parameters during local optimization (single optimum solution). For nonlinear geophysical problems and in the presence of multiple...

Dadi, Sireesh

2014-04-23T23:59:59.000Z

279

Stochastic and Deterministic Inversion Methods for History Matching of Production and Time-Lapse Seismic Data  

E-Print Network [OSTI]

-based inversion methods as a deterministic approach for integrating both production and time-lapse seismic data into high resolution reservoir models. For the ensemble Kalman filter, we develope a physically motivated phase streamline-based covariance...

Watanabe, Shingo

2013-08-26T23:59:59.000Z

280

Comprehensive inverse modeling for the study of carrier transport models in sub-50nm MOSFETs  

E-Print Network [OSTI]

Direct quantitative 2-D characterization of sub-50 nm MOSFETs continues to be elusive. This research develops a comprehensive indirect inverse modeling technique for extracting 2-D device topology using combined log(I)-V ...

Djomehri, Ihsan Jahed, 1976-

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

A Full Field Inversion Method for Acoustic Tomography of Ocean Currents  

Science Journals Connector (OSTI)

An extension of the matched field inversion technique to include oceanic current tomography is considered. Matching of the non-reciprocity of acoustic fields propagated in opposite directions (instead of match...

O. A. Godin; D. Yu. Mikhin; A. V. Mokhov

1995-01-01T23:59:59.000Z

282

Structural fabric of the Palisades Monocline: a study of positive inversion, Grand Canyon, Arizona  

E-Print Network [OSTI]

. During inversion, contraction induced reverse reactivation of existing hanging wall faults, footwall folding and footwall thrust-faulting. Precambrian normal slip along the master normal fault and subsequent Laramide reverse slip along the new footwall...

Orofino, James Cory

2005-08-29T23:59:59.000Z

283

Chromosomal evolution in the Drosophila cardini group (Diptera: Drosophilidae): photomaps and inversion analysis  

Science Journals Connector (OSTI)

Phylogenetic relationships within the cardini...group have been proposed using male genital morphology and intercrossing tests (Futch 1962; Heed 1962), chromosomal inversions (Heed and Russell 1971), allozyme pol...

Juliana Cordeiro; Daniela Cristina De Toni; Gisele de Souza da Silva

2014-10-01T23:59:59.000Z

284

Evidence for Large-Scale Laramide Tectonic Inversion and a Mid...  

Open Energy Info (EERE)

Scale Laramide Tectonic Inversion and a Mid-Tertiary Caldera Ring Fracture Zone at the Lightning Dock Geothermal System, New Mexico Jump to: navigation, search OpenEI Reference...

285

Parameter Identification for a Dispersive Dielectric in 2D Electromagnetics: Forward and Inverse  

E-Print Network [OSTI]

Parameter Identification for a Dispersive Dielectric in 2D Electromagnetics: Forward and Inverse with a Debye dielectric slab and PML absorbing boundaries. This system assumes that the electric #12;Parameter

286

Particle-Filter-Based Multisensor Fusion For Solving Low-Frequency Electromagnetic NDE Inverse Problems  

SciTech Connect (OSTI)

Flaw profile characterization from NDE measurements is a typical inverse problem. A novel transformation of this inverse problem into a tracking problem, and subsequent application of a sequential Monte Carlo method called particle filtering, has been proposed by the authors in an earlier publication [1]. In this study, the problem of flaw characterization from multi-sensor data is considered. The NDE inverse problem is posed as a statistical inverse problem and particle filtering is modified to handle data from multiple measurement modes. The measurement modes are assumed to be independent of each other with principal component analysis (PCA) used to legitimize the assumption of independence. The proposed particle filter based data fusion algorithm is applied to experimental NDE data to investigate its feasibility.

Khan, T.; Ramuhalli, Pradeep; Dass, Sarat

2011-06-30T23:59:59.000Z

287

Application Of 3D Inversion To Magnetotelluric Data In The Ogiri...  

Open Energy Info (EERE)

Of 3D Inversion To Magnetotelluric Data In The Ogiri Geothermal Area, Japan Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Application Of 3D...

288

A Unified Approach to Various Techniques for the Nonuniqueness of the Inverse Gravimetric Problem  

E-Print Network [OSTI]

­posed inverse problem is the inversion of New- ton's Law of Gravitation V (y) = B D(x) |x - y| dx , where V is the gravitational potential, which is given, for example at the Earth's surface or at satellite height, is the gravitational constant, B is the closed unit ball, and D L2(B) is the unknown mass density function. The first

289

An efficient strategy for the inversion of bidirectional reflectance models with satellite remote sensing data  

SciTech Connect (OSTI)

The angular distribution of radiation scattered by the earth surface contains information on the structural and optical properties of the surface. Potentially, this information may be retrieved through the inversion of surface bidirectional reflectance distribution function (BRDF) models. This report details the limitations and efficient application of BRDF model inversions using data from ground- and satellite-based sensors. A turbid medium BRDF model, based on the discrete ordinates solution to the transport equation, was used to quantify the sensitivity of top-of-canopy reflectance to vegetation and soil parameters. Results were used to define parameter sets for inversions. Using synthetic reflectance values, the invertibility of the model was investigated for different optimization algorithms, surface and sampling conditions. Inversions were also conducted with field data from a ground-based radiometer. First, a soil BRDF model was inverted for different soil and sampling conditions. A condition-invariant solution was determined and used as the lower boundary condition in canopy model inversions. Finally, a scheme was developed to improve the speed and accuracy of inversions.

Privette, J.L.

1994-12-31T23:59:59.000Z

290

The borderlines of the invisibility and visibility for Calderon's inverse problem  

E-Print Network [OSTI]

We consider the determination of a conductivity function in a two-dimensional domain from the Cauchy data of the solutions of the conductivity equation on the boundary. We prove uniqueness results for this inverse problem, posed by Calderon, for conductivities that are degenerate, that is, they may not be bounded from above or below. In particular, for scalar conductivities we solve the inverse problem in a class which is larger than $L^\\infty$. Also, we give new counterexamples for the uniqueness of the inverse conductivity problem. We say that a conductivity is visible if the inverse problem is solvable so that the inside of the domain can be uniquely determined, up to a change of coordinates, using the boundary measurements. The present counterexamples for the inverse problem have been related to the invisibility cloaking. This means that there are conductivities for which a part of the domain is shielded from detection via boundary measurements. Such conductivities are called invisibility cloaks. In the present paper we identify the borderline of the visible conductivities and the borderline of invisibility cloaking conductivities. Surprisingly, these borderlines are not the same. We show that between the visible and the cloaking conductivities there are the electric holograms, conductivities which create an illusion of a non-existing body. The electric holograms give counterexamples for the uniqueness of the inverse problem which are less degenerate than the previously known ones.

Kari Astala; Matti Lassas; Lassi Paivarinta

2011-09-13T23:59:59.000Z

291

Efficient Inversion of Mult-frequency and Multi-Source Electromagnetic Data  

SciTech Connect (OSTI)

The project covered by this report focused on development of efficient but robust non-linear inversion algorithms for electromagnetic induction data, in particular for data collected with multiple receivers, and multiple transmitters, a situation extremely common in eophysical EM subsurface imaging methods. A key observation is that for such multi-transmitter problems each step in commonly used linearized iterative limited memory search schemes such as conjugate gradients (CG) requires solution of forward and adjoint EM problems for each of the N frequencies or sources, essentially generating data sensitivities for an N dimensional data-subspace. These multiple sensitivities allow a good approximation to the full Jacobian of the data mapping to be built up in many fewer search steps than would be required by application of textbook optimization methods, which take no account of the multiplicity of forward problems that must be solved for each search step. We have applied this idea to a develop a hybrid inversion scheme that combines features of the iterative limited memory type methods with a Newton-type approach using a partial calculation of the Jacobian. Initial tests on 2D problems show that the new approach produces results essentially identical to a Newton type Occam minimum structure inversion, while running more rapidly than an iterative (fixed regularization parameter) CG style inversion. Memory requirements, while greater than for something like CG, are modest enough that even in 3D the scheme should allow 3D inverse problems to be solved on a common desktop PC, at least for modest (~ 100 sites, 15-20 frequencies) data sets. A secondary focus of the research has been development of a modular system for EM inversion, using an object oriented approach. This system has proven useful for more rapid prototyping of inversion algorithms, in particular allowing initial development and testing to be conducted with two-dimensional example problems, before approaching more computationally cumbersome three-dimensional problems.

Gary D. Egbert

2007-03-22T23:59:59.000Z

292

The influence of air temperature inversions on snowmelt and glacier mass-balance simulations, Ammassalik island, SE Greenland  

SciTech Connect (OSTI)

In many applications, a realistic description of air temperature inversions is essential for accurate snow and glacier ice melt, and glacier mass-balance simulations. A physically based snow-evolution modeling system (SnowModel) was used to simulate eight years (1998/99 to 2005/06) of snow accumulation and snow and glacier ice ablation from numerous small coastal marginal glaciers on the SW-part of Ammassalik Island in SE Greenland. These glaciers are regularly influenced by inversions and sea breezes associated with the adjacent relatively low temperature and frequently ice-choked fjords and ocean. To account for the influence of these inversions on the spatiotemporal variation of air temperature and snow and glacier melt rates, temperature inversion routines were added to MircoMet, the meteorological distribution sub-model used in SnowModel. The inversions were observed and modeled to occur during 84% of the simulation period. Modeled inversions were defined not to occur during days with strong winds and high precipitation rates due to the potential of inversion break-up. Field observations showed inversions to extend from sea level to approximately 300 m a.s.l., and this inversion level was prescribed in the model simulations. Simulations with and without the inversion routines were compared. The inversion model produced air temperature distributions with warmer lower elevation areas and cooler higher elevation areas than without inversion routines due to the use of cold sea-breeze base temperature data from underneath the inversion. This yielded an up to 2 weeks earlier snowmelt in the lower areas and up to 1 to 3 weeks later snowmelt in the higher elevation areas of the simulation domain. Averaged mean annual modeled surface mass-balance for all glaciers (mainly located above the inversion layer) was -720 {+-} 620 mm w.eq. y{sup -1} for inversion simulations, and -880 {+-} 620 mm w.eq. y{sup -1} without the inversion routines, a difference of 160 mm w.eq. y{sup -1}. The annual glacier loss for the two simulations was 50.7 x 10{sup 6} m{sup 3} y{sup -1} and 64.4 x 10{sup 6} m{sup 3} y{sup -1} for all glaciers - a difference of {approx}21%. The average equilibrium line altitude (ELA) for all glaciers in the simulation domain was located at 875 m a.s.l. and at 900 m a.s.l. for simulations with or without inversion routines, respectively.

Mernild, Sebastian Haugard [Los Alamos National Laboratory; Liston, Glen [COLORADO STATE UNIV.

2009-01-01T23:59:59.000Z

293

Forming Analysis of AZ31 Magnesium Alloy Sheets by Means of a Multistep Inverse Approach  

SciTech Connect (OSTI)

This paper applies a multi-step inverse approach to predict the forming of AZ31 magnesium alloy sheets. An in-house finite element code named INAPH, which implements the inverse approach formulation by Guo et al. (Int. J. Numer. Methods Eng., 30, 1385-1401), has been used for the forming analysis. This inverse approach uses the deformation theory of plasticity and assumes that the deformation is independent of the loading history. Failure during forming is predicted by a stress-based criterion or a forming limit diagram-based criterion. The INAPH predictions have been compared with experimental results of Takuda et al (Journal of Materials Processing Technology, 89-90:135-140) and incremental analysis using ABAQUS. The multi-step inverse analysis has been shown to very quickly and fairly accurately predict stress, plastic strain, thickness distributions and failure locations on deeply drawn parts made of AZ31 magnesium alloy. The capability of INAPH to predict the formability of magnesium alloys has also been demonstrated at various temperatures. As magnesium alloys possess very limited formability at room temperature, and their formability becomes better at higher temperatures (> 100oC), the inverse analysis constitutes an efficient and valuable tool to predict forming of magnesium alloy parts as a function of temperature. In addition, other processing and design parameters such as the initial dimensions, final desired shape, blank holder forces, and friction can be quickly adjusted to assess the forming feasibility.

Nguyen, Ba Nghiep; Bapanapalli, Satish K.

2009-04-01T23:59:59.000Z

294

A GOODNESS-OF-FIT TEST FOR THE INVERSE GAUSSIAN DISTRIBUTION BASED ON THE MATSUMOTO-YOR PROPERTY  

E-Print Network [OSTI]

A GOODNESS-OF-FIT TEST FOR THE INVERSE GAUSSIAN DISTRIBUTION BASED ON THE MATSUMOTO-YOR PROPERTY-of-fit test for the inverse Gaussian distribution. Résumé : Soient X et Y des variables aléatoires positives utilisons cette pro- priété pour proposer un test d'adéquation pour la loi gaussienne inverse. Keywords

Boyer, Edmond

295

The $?$-term, CP$^{N-1}$ Model and the Inversion Approach in the Imaginary $?$ Method  

E-Print Network [OSTI]

The weak coupling region of CP$^{N-1}$ lattice field theory with the $\\theta$-term is investigated. Both the usual real theta method and the imaginary theta method are studied. The latter was first proposed by Bhanot and David. Azcoiti et al. proposed an inversion approach based on the imaginary theta method. The role of the inversion approach is investigated in this paper. A wide range of values of $h=-{\\rm Im} \\theta$ is studied, where $\\theta $ denotes the magnitude of the topological term. Step-like behavior in the $x$-$h$ relation (where $x=Q/V$, $Q$ is the topological charge, and $V$ is the two dimensional volume) is found in the weak coupling region. The physical meaning of the position of the step-like behavior is discussed. The inversion approach is applied to weak coupling regions.

Masahiro Imachi; Hitoshi Kambayashi; Yasuhiko Shinno; Hiroshi Yoneyama

2006-01-23T23:59:59.000Z

296

Statistic inversion of multi-zone transition probability models for aquifer characterization in alluvial fans  

E-Print Network [OSTI]

Understanding the heterogeneity arising from the complex architecture of sedimentary sequences in alluvial fans is challenging. This paper develops a statistical inverse framework in a multi-zone transition probability approach for characterizing the heterogeneity in alluvial fans. An analytical solution of the transition probability matrix is used to define the statistical relationships among different hydrofacies and their mean lengths, integral scales, and volumetric proportions. A statistical inversion is conducted to identify the multi-zone transition probability models and estimate the optimal statistical parameters using the modified Gauss-Newton-Levenberg-Marquardt method. The Jacobian matrix is computed by the sensitivity equation method, which results in an accurate inverse solution with quantification of parameter uncertainty. We use the Chaobai River alluvial fan in the Beijing Plain, China, as an example for elucidating the methodology of alluvial fan characterization. The alluvial fan is divided...

Zhu, Lin; Gong, Huili; Gable, Carl; Teatini, Pietro

2015-01-01T23:59:59.000Z

297

High-Power Laser Pulse Recirculation for Inverse Compton Scattering-Produced Gamma-Rays  

SciTech Connect (OSTI)

Inverse Compton scattering of high-power laser pulses on relativistic electron bunches represents an attractive method for high-brightness, quasi-monoenergetic {gamma}-ray production. The efficiency of {gamma}-ray generation via inverse Compton scattering is severely constrained by the small Thomson scattering cross section. Furthermore, repetition rates of high-energy short-pulse lasers are poorly matched with those available from electron accelerators, resulting in low repetition rates for generated {gamma}-rays. Laser recirculation has been proposed as a method to address those limitations, but has been limited to only small pulse energies and peak powers. Here we propose and experimentally demonstrate an alternative method for laser pulse recirculation that is uniquely capable of recirculating short pulses with energies exceeding 1 J. Inverse Compton scattering of recirculated Joule-level laser pulses has a potential to produce unprecedented peak and average {gamma}-ray brightness in the next generation of sources.

Jovanovic, I; Shverdin, M; Gibson, D; Brown, C

2007-04-17T23:59:59.000Z

298

Three-Dimensional Inversion of Magnetotelluric Data on a PC, Methodology  

Open Energy Info (EERE)

Dimensional Inversion of Magnetotelluric Data on a PC, Methodology Dimensional Inversion of Magnetotelluric Data on a PC, Methodology and Applications to the Coso Geothermal Field Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Three-Dimensional Inversion of Magnetotelluric Data on a PC, Methodology and Applications to the Coso Geothermal Field Details Activities (1) Areas (1) Regions (0) Abstract: We describe here efforts in technology development to invert magnetotelluric (MT) data collected in geothermal settings for three-dimensional resistivity models using desktop PC's or small clusters. A finite difference scheme is utilized for the forward problem, with various options to compute the parameter Jacobians, and parameter step estimates are defined using an explicit Gauss-Newton step. The paper

299

Modeling the reactive inorganic solute distributions in the groundwater flow systems of the Hanford Site using inverse analytical modeling techniques.  

E-Print Network [OSTI]

??Inverse analytical techniques were used to model solute distributions and determine transport parameters for two flow systems in the Yakima Basalt subgroup at the Hanford (more)

Adamski, Mark Robert

2012-01-01T23:59:59.000Z

300

Nonperturbative ocean acoustic tomography inversion of 1000?km pulse propagation in the Pacific Ocean  

Science Journals Connector (OSTI)

A nonperturbative inversion was performed of acoustic tomographymeasurements made in the northeastern Pacific Ocean in July 1989 in which acoustic transmissions from a 250?Hz broadband source located near the sound?channel axis were recorded at a long vertical array of hydrophones 1000 km away. In contrast with a conventional inversion this nonperturbative inversion does not assume that travel times are linearly related to the sound?speed deviations from a background sound?speed model. The inversion process involved three steps: (1) Measured pulse travel times and the source and receiver locations were used to determine the range average of the equivalent symmetric sound?slowness profile. That part of the inversion used only curve fitting and Abel transforms and required independent (nontomographic) information only to help identify the pulse arrivals. (2) Under the assumption that the range dependence of sound speed was small we used the reciprocal of the range?averaged sound?slowness profile to approximate the range average of the sound?speed profile. (3) Constraining the sound speed below the sound?channel axis to match climatological data and neglecting the range dependence of sound speed below the sound?channel axis allowed us to estimate the range average of the sound?speed profile above the sound?channel axis. This inversion was compared with the range average of sound speed calculated from CTD measurements made during the experiment over a 10?day period. The agreement was good between 50? and 300?m depths but there were some disagreements near the surface and near the sound?channel axis.

R. Michael Jones; Bruce M. Howe; James A. Mercer; Robert C. Spindel; T. M. Georges

1994-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Inverse scattering series for multiple attenuation: An example with surface and internal multiples  

SciTech Connect (OSTI)

A multiple attenuation method derived from an inverse scattering series is described. The inversion series approach allows a separation of multiple attenuation subseries from the full series. The surface multiple attenuation subseries was described and illustrated in Carvalho et al. (1991, 1992). The internal multiple attenuation method consists of selecting the parts of the odd terms that are associated with removing only multiply reflected energy. The method, for both types of multiples, is multidimensional and does not rely on periodicity or differential moveout, nor does it require a model of the reflectors generating the multiples. An example with internal and surface multiples will be presented.

Araujo, F.V. [PPPG/Federal Univ. of Bahia, Salvador (Brazil); Weglein, A.B. [Schlumberger Cambridge Research (United Kingdom); Carvalho, P.M. [Petrobras SA, Rio de Janeiro (Brazil); Stolt, R.H.

1994-12-31T23:59:59.000Z

302

Tests of the Gravitational Inverse-Square Law below the Dark-Energy Length Scale  

E-Print Network [OSTI]

We conducted three torsion-balance experiments to test the gravitational inverse-square law at separations between 9.53 mm and 55 micrometers, probing distances less than the dark-energy length scale $\\lambda_{\\rm d}=\\sqrt[4]{\\hbar c/\\rho_{\\rm d}}\\approx 85 \\mu$m. We find with 95% confidence that the inverse-square law holds ($|\\alpha| \\leq 1$) down to a length scale $\\lambda = 56 \\mu$m and that an extra dimension must have a size $R \\leq 44 \\mu$m.

D. J. Kapner; T. S. Cook; E. G. Adelberger; J. H. Gundlach; B. R. Heckel; C. D. Hoyle; H. E. Swanson

2006-11-14T23:59:59.000Z

303

Analysis of forward and inverse problems in chemical dynamics and spectroscopy  

SciTech Connect (OSTI)

The overall scope of this research concerns the development and application of forward and inverse analysis tools for problems in chemical dynamics and chemical kinetics. The chemical dynamics work is specifically associated with relating features in potential surfaces and resultant dynamical behavior. The analogous inverse research aims to provide stable algorithms for extracting potential surfaces from laboratory data. In the case of chemical kinetics, the focus is on the development of systematic means to reduce the complexity of chemical kinetic models. Recent progress in these directions is summarized below.

Rabitz, H. [Princeton Univ., NJ (United States)

1993-12-01T23:59:59.000Z

304

Inverse scattering transform for the focusing nonlinear Schrdinger equation with nonzero boundary conditions  

SciTech Connect (OSTI)

The inverse scattering transform for the focusing nonlinear Schrdinger equation with non-zero boundary conditions at infinity is presented, including the determination of the analyticity of the scattering eigenfunctions, the introduction of the appropriate Riemann surface and uniformization variable, the symmetries, discrete spectrum, asymptotics, trace formulae and the so-called theta condition, and the formulation of the inverse problem in terms of a Riemann-Hilbert problem. In addition, the general behavior of the soliton solutions is discussed, as well as the reductions to all special cases previously discussed in the literature.

Biondini, Gino [Department of Mathematics, State University of New York at Buffalo, Buffalo, New York 14260 (United States)] [Department of Mathematics, State University of New York at Buffalo, Buffalo, New York 14260 (United States); Kova?i?, Gregor [Department of Mathematical Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)] [Department of Mathematical Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)

2014-03-15T23:59:59.000Z

305

Inversion of TEM sounding data using the steepest descent and the conjugate gradients methods  

E-Print Network [OSTI]

for la er conductivities Intensively covered case Figure 2 shows four test models (Ml-M4) and their associated TEM responses used for the two-parameter inversion. For both of the SD and CG methods, the first TEM response was intensively covered... for la er conductivities Intensively covered case Figure 2 shows four test models (Ml-M4) and their associated TEM responses used for the two-parameter inversion. For both of the SD and CG methods, the first TEM response was intensively covered...

Alsabti, Abdallah S

2012-06-07T23:59:59.000Z

306

Coherent Phonon-Grain Boundary Scattering in Silicon Inverse Opals Bibek R. Parajuli,,  

E-Print Network [OSTI]

in the structure. The corresponding material thermal conductivity is in the range 5-12 W/mK and has an anomalous T1 the lattice structure resulting in significant increase in thermal resistance. At microscopic length scales thermal conductivity of the material. Previous theoretical work on thermal transport in inverse opals12

Braun, Paul

307

Sustainability of terrestrial carbon sequestration: A case study in Duke Forest with inversion approach  

E-Print Network [OSTI]

Sustainability of terrestrial carbon sequestration: A case study in Duke Forest with inversion of terrestrial carbon (C) sequestration is critical for the success of any policies geared toward stabilizing. Ellsworth, A. Finzi, J. Lichter, and W. H. Schlesinger, Sustainability of terrestrial carbon sequestration

DeLucia, Evan H.

308

Anisotropic inversion of refracted waves in vertical cable data in the presence of dip  

E-Print Network [OSTI]

the anisotropic parameters of these shales in situ. In these studies, seismic lines were laid out parallelAnisotropic inversion of refracted waves in vertical cable data in the presence of dip Hejie Wang1 isotropic and anisotropic media. Two sets of transversely isotropic models are used to analyse the azimuthal

Edinburgh, University of

309

The Asperity-deformation Model Improvements and Its Applications to Velocity Inversion  

E-Print Network [OSTI]

the data to within first-order approximation, some systematic misfits exist as a result of using the rigid-host solution, whereas compliant-host inversion returns smaller and random misfits, yet out-of-range parameter estimates. These problems indicate...

Bui, Hoa Q.

2010-01-16T23:59:59.000Z

310

Building starting model for full waveform inversion from wide-aperture data by stereotomography  

E-Print Network [OSTI]

Building starting model for full waveform inversion from wide-aperture data by stereotomography CGG Veritas, Massy, France; 3 LGIT - UJF - CNRS, France Abstract Building reliable starting model). In this study, we assess the stereotomography as a tool to build reliable starting model for frequency

Vallée, Martin

311

Durability Assessment of an Arch Dam using Inverse Analysis with Neural Networks and High Performance Computing.  

E-Print Network [OSTI]

the viscoelastic parameters; 3D FEM analysis using High Performance Computing (parallel and vector features) to run Performance Computing. E. M. R. Fairbairn, E. Goulart, A. L. G. A. Coutinho, N. F. F. Ebecken COPPEDurability Assessment of an Arch Dam using Inverse Analysis with Neural Networks and High

Coutinho, Alvaro L. G. A.

312

Particle Physics Implications of a Recent Test of the Gravitational Inverse Square Law  

E-Print Network [OSTI]

We use data from our recent search for violations of the gravitational inverse-square law to constrain dilaton, radion and chameleon exchange forces as well as arbitrary vector or scalar interactions. We test the interpretation of the PVLAS effect and a conjectured ``fat graviton'' scenario and constrain the $\\gamma_5$ couplings of pseuodscalar bosons and arbitrary power-law interactions.

E. G. Adelberger; B. R. Heckel; S. Hoedl; C. D. Hoyle; D. J. Kapner; A. Upadhye

2007-02-07T23:59:59.000Z

313

Quantification of Nanoscale Density Fluctuations in Biological Cells/Tissues: Inverse Participation Ratio (IPR) Analysis of  

E-Print Network [OSTI]

Ratio (IPR) Analysis of Transmission Electron Microscopy Images and Implications for Early-Stage Cancer analysis of the inverse participation ratio (IPR) of the eigenfunctions of these optical lattices at the nanoscales. First, the IPR analysis is validated in experiments with models of disordered systems fabricated

Pradhan, Prabhakar

314

ApJ (submitted) Synchrotron self-inverse Compton radiation from reverse shock on  

E-Print Network [OSTI]

ApJ (submitted) Synchrotron self-inverse Compton radiation from reverse shock on GRB120326A Yuji Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 6 Center for the Exploration of the Origin-ku, Nagoya, Aichi 464- 8601, Japan 8 Division of Particle and Astrophysical Science, Graduate School

Pak, Soojong

315

Mapping microphytobenthos biomass by non-linear inversion of visible-infrared hyperspectral images  

E-Print Network [OSTI]

- 1 - Mapping microphytobenthos biomass by non-linear inversion of visible-infrared hyperspectral-Philippe.Combe@chimie.univ-nantes.fr Abstract This study presents an innovative approach to map microphytobenthos biomass and fractional cover to microscale intimate mixtures. This prevents the use of classical linear unmixing models to retrieve biomass

Combe, Jean-Philippe

316

Computer Physics Communications 66(1991) 243-258 Function parametrization: a fast inverse mapping method  

E-Print Network [OSTI]

1 Computer Physics Communications 66(1991) 243-258 Function parametrization: a fast inverse mapping (FP) is a method to invert computer models that map physical parameters describing the state that requires little computing time to evaluate. The major advantages of FP over other analysis methods are

van Milligen, Boudewijn

317

First-order disorder-driven transition and inverse melting of the vortex lattice  

E-Print Network [OSTI]

`inverse' melting behavior. ? 2001 Published by Elsevier Science B.V. Keywords: Type-II superconductivity-order transition (FOT) [1±5] whereas at low temperatures the ordered vortex lattice transforms into a disordered open questions in the phase diagram of HTS is the thermodynamic nature of the disorder-dri- ven

Zeldov, Eli

318

Selection of desired dynamics for Dynamic Inversion controlled re-entry vehicles  

E-Print Network [OSTI]

-shaping compensator that affects the closed-loop response of the entire system. This paper attempts to quantify the particular form of desired dynamics that produces the best overall closed-loop performance and robustness in a Dynamic Inversion flight controller...

Georgie, Jennifer Anne

2012-06-07T23:59:59.000Z

319

Inverse modeling of surface emissions for local pollution: A new methodology applied to academic test cases  

E-Print Network [OSTI]

Inverse modeling of surface emissions for local pollution: A new methodology applied to academic; (2) LISA Creteil France Needs: Optimize surface emissions using daily recorded ozone and NOX by PRIMEQUAL2, program of the french ministry of environment Firstguess emissions inventory for the Paris

Menut, Laurent

320

Inverse modeling of European CH4 emissions 20012006 P. Bergamaschi,1  

E-Print Network [OSTI]

Inverse modeling of European CH4 emissions 2001­2006 P. Bergamaschi,1 M. Krol,2,3,4 J. F. Meirink,5] European CH4 emissions are estimated for the period 2001­2006 using a four dimensional variational (4DVAR/ESRL network. The available observations mainly provide information on the emissions from northwest Europe (NWE

Haak, Hein

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Market making with an inverse Kelly strategy E. Noon* and W. Knottenbelt**  

E-Print Network [OSTI]

229 Market making with an inverse Kelly strategy E. Noon* and W. Knottenbelt** *Imperial College Kensington Campus, London, SW7 2AZ. wjk@doc.ic.ac.uk Abstract. Kelly's celebrated staking system calculates the optimal fraction of wealth to bet on each of a series of favourable bets. We previously extended Kelly

Knottenbelt, William J.

322

Coding into a source: an inverse rate-distortion Anant Sahai  

E-Print Network [OSTI]

Sahai (UC Berkeley) Inverse Rate Distortion Sep 27, 2006 1 / 27 #12;Suppose the aliens landed. . . Your Distortion Sep 27, 2006 2 / 27 #12;Suppose the aliens landed. . . Your mission: reverse 27, 2006 2 / 27 #12;Suppose the aliens landed. . . Your mission: reverse

Sahai, Anant

323

Limitations of polynomial chaos expansions in the Bayesian solution of inverse problems  

E-Print Network [OSTI]

expensive, especially in high-dimensional problems. Polynomial chaos expansions (PCE) and generalized PCE,14,20,29]) which can be used to reduce the cost of Bayesian inverse problems [2,16­18,21]. The PCE leads), the surrogate posterior can be very different from the posterior and PCE-based sampling is either inaccurate

Chorin, Alexandre J.

324

A modified R1 R1 method for helioseismic rotation inversions  

Science Journals Connector (OSTI)

......forskningsfond, Institut for Fysik og Astronomi, Aarhus...to linear perturbation theory, which is an excellent...the advantage of the basic ~I ~I concept. We...still be superior to a basic ~1 ~1 inversion, as...described by first-order theory). Sekii's original......

F. P. Pijpers; M. J. Thompson

1996-03-11T23:59:59.000Z

325

A scalable framework for the solution of stochastic inverse problems using a sparse grid collocation approach  

SciTech Connect (OSTI)

Experimental evidence suggests that the dynamics of many physical phenomena are significantly affected by the underlying uncertainties associated with variations in properties and fluctuations in operating conditions. Recent developments in stochastic analysis have opened the possibility of realistic modeling of such systems in the presence of multiple sources of uncertainties. These advances raise the possibility of solving the corresponding stochastic inverse problem: the problem of designing/estimating the evolution of a system in the presence of multiple sources of uncertainty given limited information. A scalable, parallel methodology for stochastic inverse/design problems is developed in this article. The representation of the underlying uncertainties and the resultant stochastic dependant variables is performed using a sparse grid collocation methodology. A novel stochastic sensitivity method is introduced based on multiple solutions to deterministic sensitivity problems. The stochastic inverse/design problem is transformed to a deterministic optimization problem in a larger-dimensional space that is subsequently solved using deterministic optimization algorithms. The design framework relies entirely on deterministic direct and sensitivity analysis of the continuum systems, thereby significantly enhancing the range of applicability of the framework for the design in the presence of uncertainty of many other systems usually analyzed with legacy codes. Various illustrative examples with multiple sources of uncertainty including inverse heat conduction problems in random heterogeneous media are provided to showcase the developed framework.

Zabaras, N. [Materials Process Design and Control Laboratory, Sibley School of Mechanical and Aerospace Engineering, 101 Frank H.T. Rhodes Hall, Cornell University, Ithaca, NY 14853-3801 (United States)], E-mail: zabaras@cornell.edu; Ganapathysubramanian, B. [Materials Process Design and Control Laboratory, Sibley School of Mechanical and Aerospace Engineering, 101 Frank H.T. Rhodes Hall, Cornell University, Ithaca, NY 14853-3801 (United States)

2008-04-20T23:59:59.000Z

326

Inverse Beta Decay in a Nonequilibrium Antineutrino Flux from a Nuclear Reactor  

E-Print Network [OSTI]

The evolution of the reactor antineutrino spectrum toward equilibrium above the inverse beta-decay threshold during the reactor operating period and the decay of residual antineutrino radiation after reactor shutdown are considered. It is found that, under certain conditions, these processes can play a significant role in experiments seeking neutrino oscillations.

V. I. Kopeikin; L. A. Mikaelyan; V. V. Sinev

2001-10-23T23:59:59.000Z

327

INVERSE PROBLEMS FOR A CLASS OF MEASURE DEPENDENT DYNAMICAL H. T. BANKS  

E-Print Network [OSTI]

of polymers and rubber, and polarization in dielectric materials. We develop an inverse problem framework pathways for virus production. These delays represent lags between acute infection of cells and the initiation of vi- ral production as well as between productive acute infection and chronic infection (e

328

Stationary IPA Estimates for Non-Smooth G/G/1/ Functionals via Palm Inversion and  

E-Print Network [OSTI]

Stationary IPA Estimates for Non-Smooth G/G/1/ Functionals via Palm Inversion and Level, the derivative of J with respect to . To this end, we use Infinitesimal Perturbation Analysis (IPA), a method on IPA. Alternative methods have been used to estimate derivatives, namely Smooth Perturbation Analysis

Paris-Sud XI, Université de

329

Bayesian analysis of the scatterometer wind retrieval inverse problem: some new approaches  

E-Print Network [OSTI]

the solution of this inverse problem. We apply our methods to both data assimilation, where we have, Birmingham B4 7ET, UK Summary. The retrieval of wind vectors from satellite scatterometers is a non the size of the data set can become prohibitively large. We contrast the sampling results

330

Inexact range-space Krylov solvers for linear systems arising from inverse problems  

E-Print Network [OSTI]

is crucial in data assimilation appli- cations and other inverse problems. Secondly, it is shown.1) and methods of the type we just men- tioned finds its origin in (but is not limited by) the data assimilation. Keywords: Krylov methods, linear systems, inexact matrix products, data assimila- tion. 1 Introduction

Toint, Philippe

331

Inverse-synthetic-aperture imaging of trees over a ground plane  

SciTech Connect (OSTI)

Recent data collections with the Sandia VHF-UHF synthetic-aperture radar have yielded surprising results; trees appear brighter in the images than expected! In an effort to understand this phenomenon, various small trees have been measured on the Sandia folded compact range with the inverse-synthetic-aperture imaging system. A compilation of these measurements is contained in this report.

Zittel, D.H.; Brock, B.C.; Littlejohn, J.H.; Patitz, W.E.

1995-11-01T23:59:59.000Z

332

Mesoporous composite cathode materials prepared from inverse micelle structures for high  

E-Print Network [OSTI]

active materials in LIBs. Manganese oxide-based compounds are particularly attrac- tive as cathodes owingMesoporous composite cathode materials prepared from inverse micelle structures for highCoO2) is the most common active material.1 However, since natural deposits of cobalt are scarce

Cao, Guozhong

333

Inverse Problems in Science and Engineering Vol. 00, No. 00, July 2004, 125  

E-Print Network [OSTI]

of the solar Bremsstrahlung inverse problem: model dependence and implementation issues A.M.Massone M problem in solar plasma physics by means of an `ad hoc' imple- mentation of the Tikhonov regularization, an application to a real observationrecorded by the NASA mission 'Reuven Ramaty High Energy Solar Spectroscopic

Piana, Michele

334

Inverse Problems in Transport and Diffusion Theory with Applications in Optical Tomography  

E-Print Network [OSTI]

problem related to the scattering-free atmospheric radiative transport equation. The inverse problem aims the coefficient and the source term of the transport equation) from wavenumber-dependent boundary radiation transport equation as the forward model of light propagation in tissues. We show by numerical examples

Ren, Kui

335

An accurate solver for forward and inverse transport. Francois Monard and Guillaume Bal  

E-Print Network [OSTI]

(radiative transfer) equations numerically. Our main objective is to address the inverse transport problem theory. 1 Introduction The radiative transfer (linear Boltzmann or linear transport) equation finds. Although the methodology might not be the fastest way to solve transport equations, its physical accuracy

Bal, Guillaume

336

An inverse correlation between loop length and stability in a four-helix-bundle protein  

E-Print Network [OSTI]

their intrinsic func- tionality upon their new environmental context: the calcium-binding activity of a loop has the molten globule behavior of apo- - lactalbumin in the absence of calcium [18]. Conversely, loops have beenAn inverse correlation between loop length and stability in a four-helix-bundle protein Athena D

Mochrie, Simon

337

Experimental Measurement of Lateral Transport in the Inversion Layer of Silicon Heterojunction Solar Cells  

E-Print Network [OSTI]

]. Furthermore, the a-Si:H emitter and back surface field depositions are performed at low temperatures, which-type emitter configuration that is commonly used, the c-Si/a-Si:H heterointerface presents a valence band in the inversion layer. II. EXPERIMENTAL The experimental structure used was a SHJ emitter, in which an intrinsic a-Si:H

Atwater, Harry

338

Asking for Help Using Inverse Semantics Author Names Omitted for Anonymous Review. Paper-ID 69  

E-Print Network [OSTI]

Asking for Help Using Inverse Semantics Author Names Omitted for Anonymous Review. Paper-ID 69 an approach for enabling a robot to recover from failures by communicating its need for specific help targeted spoken-language requests for help such as "Please give me the white table leg that is on the black

Tellex, Stefanie

339

Volume Currents in Forward and Inverse Magnetoencephalographic Simulations Using Realistic Head Models  

E-Print Network [OSTI]

Volume Currents in Forward and Inverse Magnetoencephalographic Simulations Using Realistic Head of magnetoencephalographic MEG forward or in- verse simulations in realistic head models. We verify the accu- racy of our, in an inhomoge- neous, nonspherical realistic head model, the magnetic field normal to the MEG detector due

Utah, University of

340

Evaluating the effect of network density and geometric distribution on kinematic source inversion models  

Science Journals Connector (OSTI)

......function as slip velocity function. We test three different cases of station network...Our results show: (1) single station tests suggest that it may be possible to obtain...for source inversion. (2) Multistation tests show that the quality of the inverted source......

Youbing Zhang; Luis A. Dalguer; Seok Goo Song; John Clinton; Domenico Giardini

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

14ZH-2003-05 Hydrogel Nanoparticle Dispersins with Inverse Thermoreversible Gelation  

E-Print Network [OSTI]

14ZH-2003-05 Hydrogel Nanoparticle Dispersins with Inverse Thermoreversible Gelation Hydrogels have by entrapping a colloidal array inside a gel, by covalently bonding self-assembled nanoparticles into a network nanoparticles that can form a physically bonded nanoparticle network above a gelation temperature. The gel

Mohanty, Saraju P.

342

The Ice Cream Cone Model for Inversing Geometrical Properties of Halo Coronal Mass Ejections  

E-Print Network [OSTI]

the front half ellipse produced by the cone part when the angle of the central axis of the ice cream coneThe Ice Cream Cone Model for Inversing Geometrical Properties of Halo Coronal Mass Ejections Xue Pu recently that most of halo coronal mass ejections (CMEs) may be formed by an ice cream cone-like shell

Zhao, Xuepu

343

Inverse scattering for frequency-scanned full-field optical coherence tomography  

E-Print Network [OSTI]

Inverse scattering for frequency-scanned full-field optical coherence tomography Daniel L. Marks-field optical coherence tomography (OCT) is able to image an entire en face plane of scatterers simulta- neously: 100.3010, 110.4500. 1. INTRODUCTION The capabilities of optical coherence tomography1,2 (OCT

Bhargava, Rohit

344

NREL experiments show that disordered inverse opals significantly scatter and trap near-infrared light, with  

E-Print Network [OSTI]

NREL experiments show that disordered inverse opals significantly scatter and trap near-infrared wavelengths in the near-infrared (NIR), which is important to a number of technologies. This discovery.neale@nrel.gov Reference: N.R. Neale, B.G. Lee, S.H. Kang, and A.J. Frank."Near-Infrared Light Trapping in Disordered

345

Hysteresis Modeling and Inverse Feedforward Control of an AFM Piezoelectric Scanner Based on Nano Images  

E-Print Network [OSTI]

Hysteresis Modeling and Inverse Feedforward Control of an AFM Piezoelectric Scanner Based on Nano of micro/nano technology. As a critical part of AFM system, the piezoelectric scanner exists many defects in this paper possess a good performance for AFM nano imaging. Index Terms-- Hysteresis modeling, feedforward

Li, Yangmin

346

Frequency Moments Inverse Problem and Maximum (Shannon vs. R enyi-Tsallis) Entropy  

E-Print Network [OSTI]

) maximization of Shannon's entropy (MaxEnt), b) maximization of R#19;enyi-Tsallis entropy (maxTent). ConcerningEnt 4 1.2 Aims 5 2 Frequency moment constraints 5 2.1 Characteristics of MaxEnt choice 6 2.2 Maximum RFrequency Moments Inverse Problem and Maximum (Shannon vs. R#19;enyi-Tsallis) Entropy #3; A case

347

Characterization of heterogeneous near-surface materials by joint 2D inversion of dc resistivity and seismic data  

E-Print Network [OSTI]

Characterization of heterogeneous near-surface materials by joint 2D inversion of dc resistivity materials by joint 2D inversion of dc resistivity and seismic data, Geophys. Res. Lett., 30(13), 1658, doi electrical resistivity and seismic compressional (P) wave velocity in heterogeneous near-surface materials

Meju, Max

348

A novel optimization-based pole-figure inversion method: comparison with WIMV and maximum entropy methods  

Science Journals Connector (OSTI)

An optimization-based pole-figure inversion method is presented that utilizes the orientation distribution function gradient for conditional control of the solution. The novel pole-figure inversion method, coined the hybrid -seminorm minimization, is empirically shown to be versatile, general and robust in the presence of simulated experimental errors.

Bernier, J.V.

2006-09-12T23:59:59.000Z

349

K-space reconstruction of magnetic resonance inverse imaging (K-InI) of human visuomotor systems  

E-Print Network [OSTI]

MRI InI Visual MRI Neuroimaging K-InI Inverse solution MEG EEG Electroencephalography channels of a radio-frequency coil array, magnetic resonance inverse imaging (InI) can achieve ultra. Mathematically, the InI reconstruction is a generalization of parallel MRI (pMRI), which includes image space

350

Florence, 28/02/2011: Two applied inverse problems: Introduction 1 -Problem #1: Studying the protein fold via NMR constraints.  

E-Print Network [OSTI]

the protein fold via NMR constraints. In collaboration with the CERM (Centre for Magnetic Resonance problems. #12;Florence, 28/02/2011: Two applied inverse problems: The problem of protein folding 2 H CCN) Backbone #12;Florence, 28/02/2011: Two applied inverse problems: The problem of protein folding 3 Genoma

Pedicini, Marco

351

Single- and coupled-channel radial inverse scattering with supersymmetric transformations  

E-Print Network [OSTI]

The present status of the coupled-channel inverse-scattering method with supersymmetric transformations is reviewed. We first revisit in a pedagogical way the single-channel case, where the supersymmetric approach is shown to provide a complete solution to the inverse-scattering problem. A special emphasis is put on the differences between conservative and non-conservative transformations. In particular, we show that for the zero initial potential, a non-conservative transformation is always equivalent to a pair of conservative transformations. These single-channel results are illustrated on the inversion of the neutron-proton triplet eigenphase shifts for the S and D waves. We then summarize and extend our previous works on the coupled-channel case and stress remaining difficulties and open questions. We mostly concentrate on two-channel examples to illustrate general principles while keeping mathematics as simple as possible. In particular, we discuss the difference between the equal-threshold and different-threshold problems. For equal thresholds, conservative transformations can provide non-diagonal Jost and scattering matrices. Iterations of such transformations are shown to lead to practical algorithms for inversion. A convenient technique where the mixing parameter is fitted independently of the eigenphases is developed with iterations of pairs of conjugate transformations and applied to the neutron-proton triplet S-D scattering matrix, for which exactly-solvable matrix potential models are constructed. For different thresholds, conservative transformations do not seem to be able to provide a non-trivial coupling between channels. In contrast, a single non-conservative transformation can generate coupled-channel potentials starting from the zero potential and is a promising first step towards a full solution to the coupled-channel inverse problem with threshold differences.

Daniel Baye; Jean-Marc Sparenberg; Andrey M Pupasov-Maksimov; Boris F Samsonov

2014-06-13T23:59:59.000Z

352

A fast inverse consistent deformable image registration method based on symmetric optical flow computation  

Science Journals Connector (OSTI)

Deformable image registration is widely used in various radiation therapy applications including daily treatment planning adaptation to map planned tissue or dose to changing anatomy. In this work, a simple and efficient inverse consistency deformable registration method is proposed with aims of higher registration accuracy and faster convergence speed. Instead of registering image I to a second image J, the two images are symmetrically deformed toward one another in multiple passes, until both deformed images are matched and correct registration is therefore achieved. In each pass, a delta motion field is computed by minimizing a symmetric optical flow system cost function using modified optical flow algorithms. The images are then further deformed with the delta motion field in the positive and negative directions respectively, and then used for the next pass. The magnitude of the delta motion field is forced to be less than 0.4 voxel for every pass in order to guarantee smoothness and invertibility for the two overall motion fields that are accumulating the delta motion fields in both positive and negative directions, respectively. The final motion fields to register the original images I and J, in either direction, are calculated by inverting one overall motion field and combining the inversion result with the other overall motion field. The final motion fields are inversely consistent and this is ensured by the symmetric way that registration is carried out. The proposed method is demonstrated with phantom images, artificially deformed patient images and 4D-CT images. Our results suggest that the proposed method is able to improve the overall accuracy (reducing registration error by 30% or more, compared to the original and inversely inconsistent optical flow algorithms), reduce the inverse consistency error (by 95% or more) and increase the convergence rate (by 100% or more). The overall computation speed may slightly decrease, or increase in most cases because the new method converges faster. Compared to previously reported inverse consistency algorithms, the proposed method is simpler, easier to implement and more efficient.

Deshan Yang; Hua Li; Daniel A Low; Joseph O Deasy; Issam El Naqa

2008-01-01T23:59:59.000Z

353

Final Report: Improved Site Characterization And Storage Prediction Through Stochastic Inversion Of Time-Lapse Geophysical And Geochemical Data  

SciTech Connect (OSTI)

During the last months of this project, our project activities have concentrated on four areas: (1) performing a stochastic inversion of pattern 16 seismic data to deduce reservoir bulk/shear moduli and density; the need for this inversion was not anticipated in the original scope of work, (2) performing a stochastic inversion of pattern 16 seismic data to deduce reservoir porosity and permeability, (3) complete the software needed to perform geochemical inversions and (4) use the software to perform stochastic inversion of aqueous chemistry data to deduce mineral volume fractions. This report builds on work described in progress reports previously submitted (Ramirez et al., 2009, 2010, 2011 - reports fulfilled the requirements of deliverables D1-D4) and fulfills deliverable D5: Field-based single-pattern simulations work product. The main challenge with our stochastic inversion approach is its large computational expense, even for single reservoir patterns. We dedicated a significant level of effort to improve computational efficiency but inversions involving multiple patterns were still intractable by project's end. As a result, we were unable to fulfill Deliverable D6: Field-based multi-pattern simulations work product.

Ramirez, A; Mcnab, W; Hao, Y; White, D; Johnson, J

2011-04-14T23:59:59.000Z

354

3-D Inversion Of Borehole-To-Surface Electrical Data Using A  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » 3-D Inversion Of Borehole-To-Surface Electrical Data Using A Back-Propagation Neural Network Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: 3-D Inversion Of Borehole-To-Surface Electrical Data Using A Back-Propagation Neural Network Details Activities (0) Areas (0) Regions (0) Abstract: The "fluid-flow tomography", an advanced technique for geoelectrical survey based on the conventional mise-a-la-masse measurement, has been developed by Exploration Geophysics Laboratory at the Kyushu University. This technique is proposed to monitor fluid-flow behavior

355

Building accurate initial models using gain functions for waveform inversion in the Laplace domain  

E-Print Network [OSTI]

We suggest an initial model building technique using time gain functions in the Laplace domain. Applying the gain expressed as a power of time is equivalent to taking the partial derivative of the Laplace-domain wavefield with respect to a damping constant. We construct an objective function, which minimizes the logarithmic differences between the gained field data and the partial derivative of the modeled data with respect to the damping constant. We calculate the modeled wavefield, the partial derivative wavefield, and the gradient direction in the Laplace domain using the analytic Green's function starting from a constant velocity model. This is an efficient method to generate an accurate initial model for a following Laplace-domain inversion. Numerical examples using two marine field datasets confirm that a starting model updated once from a scratch using the gradient direction calculated with the proposed method can be successfully used for a subsequent Laplace-domain inversion.

Wansoo Ha; Changsoo Shin

2014-08-20T23:59:59.000Z

356

Use of the Inverse Approach for the Manufacture and Decoration of Food Cans  

SciTech Connect (OSTI)

Innovation is a key objective in the metal packaging industry in order to produce new concepts, designs, shapes and printing. Simulation technology now allows both the can design as well as the manufacturing process to be carefully analysed before any physical prototypes or dies have been manufactured. These simulations are traditionally carried out using incremental simulation methodologies. However, much information may also be attained by using the inverse approach: the initial blank format for the can body as well as its lid may be optimised much faster, the actual decoration of the can may be evaluated and even calculated when deformation printing techniques are utilised. This paper presents some of the technical details relating to the inverse approach employed in Stampack to carry out simulations important for the manufacture of food cans that are shown via industrial.

Duffett, G.A.; Forgas, A.; Neamtu, L. [Quantech ATZ, Barcelona (Spain); Naceur, H.; Batoz, J.L.; Guo, Y.Q. [Divergent Consultants, Centre de Transfert, Compiegne (France)

2005-08-05T23:59:59.000Z

357

Renormalization of the strongly attractive inverse square potential: Taming the singularity  

E-Print Network [OSTI]

Quantum anomalies in the inverse square potential are well known and widely investigated. Most prominent is the unbounded increase in oscillations of the particle's state as it approaches the origin when the attractive coupling parameter is greater than the critical value of 1/4. Due to this unphysical divergence in oscillations, we are proposing that the interaction gets screened at short distances making the coupling parameter acquire an effective (renormalized) value that falls within the weak range 0 to 1/4. This prevents the oscillations form growing without limit giving a lower bound to the energy spectrum and forcing the Hamiltonian of the system to be self-adjoint. Technically, this translates into a regularization scheme whereby the inverse square potential is replaced near the origin by another that has the same singularity but with a weak coupling strength. Here, we take the Eckart as the regularizing potential and obtain the corresponding solutions (discrete bound states and continuum scattering states).

A. D. Alhaidari

2014-06-14T23:59:59.000Z

358

Absorption of laser light in overdense plasmas by sheath inverse bremsstrahlung  

SciTech Connect (OSTI)

The original sheath inverse bremsstrahlung model [P. J. Catto and R. M. More, 1977] is modified by including the vxB term in the equation of motion. It is shown that the present results axe significantly different from those derived without the vxB term. The vxB term is also important in interpreting the absorption mechanism. If the vxB term were neglected, the absorption of the light would be incorrectly interpreted as an increase in the transverse electron temperature. This would violate the conservation of the transverse components of the canonical momentum, in the case of a normally incident laser light. It is also shown that both the sheath inverse bremsstrahlung and the anomalous skin effect are limiting cases of the same collisionless absorption mechanism. Finally, results from PIC plasma simulations are compared with the absorption coefficient calculated from the linear theory.

Yang, T.Y.B.; Kruer, W.L.; More, R.M.

1994-11-01T23:59:59.000Z

359

PAM-PAA microgel inverse opal photonic crystal and pH response  

Science Journals Connector (OSTI)

The colloidal crystal template or opal with a closed-packed face-centered cubic (fcc) lattice was prepared from monodisperse polystyrene (PS) spheres by vertical sedimentation. The template provided void space for infiltration of monomer precursor composed of acrylate acid, acrylamide and ammonium persulfate, as well as microgel from the subsequent copolymerization. The sample was immersed in dimethylbenzene for completely removing PS spheres to form PAM inverse opal hydrogels (IOHPAM) or PAM/PAA inverse opal hydrogels (IOHPAM/PAA) photonic crystals. The PS spheres were replaced by air spheres, which interconnected each other through the windows. The study of responses to pH show that there are two peaks for both IOHPAM and IOHPAM/PAA films, but the IOHPAM/PAA peaks shift to higher pH, and the peaks are independent with the AA content.

Yong Qiang He; Xiao Dong Wang; Jian Ying Wang; Yan Feng; Yong Qiang Zhao; Xiu Dong You

2007-01-01T23:59:59.000Z

360

Spectroscopy of Double-Beta and Inverse-Beta Decays from 100Mo for Neutrinos  

E-Print Network [OSTI]

Spectroscopic studies of two beta-rays from 100Mo are shown to be of potential interest for investigating both the Majorana neutrino mass by neutrinoless double beta-decay and low energy solar neutrino's by inverse beta-decay. With a multi-ton 100Mo detector, coincidence studies of correlated beta-beta from neutrinoless double beta-decay, together with the large Q value, permit identification of the neutrino-mass term with a sensitivity of ~ 0.03 eV. Correlation studies of the inverse beta and the successive beta-decay of 100Tc, together with the large capture rates for low energy solar neutrino's, make it possible to detect in realtime individual low energy solar neutrino in the same detector.

H. Ejiri; J. Engel; R. Hazama; P. Krastev; N. Kudomi; R. G. H. Robertson

1999-11-20T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Strategy for the inversion of Hinode spectropolarimetric measurements in the quiet Sun  

E-Print Network [OSTI]

In this paper we propose an inversion strategy for the analysis of spectropolarimetric measurements taken by {\\em Hinode} in the quiet Sun. The spectropolarimeter of the Solar Optical Telescope aboard {\\em Hinode} records the Stokes spectra of the \\ion{Fe}{i} line pair at 630.2 nm with unprecendented angular resolution, high spectral resolution, and high sensitivity. We discuss the need to consider a {\\em local} stray-light contamination to account for the effects of telescope diffraction. The strategy is applied to observations of a wide quiet Sun area at disk center. Using these data we examine the influence of noise and initial guess models in the inversion results. Our analysis yields the distributions of magnetic field strengths and stray-light factors. They show that quiet Sun internetwork regions consist mainly of hG fields with stray-light contaminations of about 0.8.

D. Orozco Suarez; L. R. Bellot Rubio; J. C. del Toro Iniesta; S. Tsuneta; B. W. Lites; K. Ichimoto; Y. Katsukawa; S. Nagata; T. Shimizu; R. A. Shine; Y. Suematsu; T. D. Tarbell; A. M. Title

2007-09-13T23:59:59.000Z

362

Robust joint full-waveform inversion of time-lapse seismic data sets with total-variation regularization  

E-Print Network [OSTI]

We present a technique for reconstructing subsurface velocity model changes from time-lapse seismic survey data using full-waveform inversion (FWI). The technique is based on simultaneously inverting multiple survey vintages, with model difference regularization using the total variation (TV) seminorm. We compare the new TV-regularized time-lapse FWI with the $L_2$-regularized joint inversion proposed in our earlier work, using synthetic data sets that exhibit survey repeatability issues. The results demonstrate clear advantages of the proposed TV-regularized joint inversion over alternatives methods for recovering production-induced model changes that are due to both fluid substitution and geomechanical effects.

Maharramov, Musa

2014-01-01T23:59:59.000Z

363

Direct Wing Design and Inverse Airfoil Identification with the Nonlinear Weissinger Method  

E-Print Network [OSTI]

A vortex-lattice method for wing aerodynamics that uses nonlinear airfoil data is presented. Two applications of this procedure are presented: Direct Design of a Flying Wing and Inverse Identification from wind tunnel measurements with low-aspect ratio wings. A Newton method is employed, which not only allows very fast solutions to the nonlinear equations but enables the calculation of static and dynamic stability and control derivatives without further cost.

Ranneberg, Maximilian

2015-01-01T23:59:59.000Z

364

Inversion of azimuthally dependent NMO velocity in transversely isotropic media with a tilted axis of symmetry  

SciTech Connect (OSTI)

Just as the transversely isotropic model with a vertical symmetry axis (VTI media) is typical for describing horizontally layered sediments, transverse isotropy with a tilted symmetry axis (TTI) describes dipping TI layers (such as tilted shale beds near salt domes) or crack systems. P-wave kinematic signatures in TTI media are controlled by the velocity V{sub PO} in the symmetry direction, Thomsen's anisotropic coefficients {xi} and {delta}, and the orientation (tilt {nu} and azimuth {beta}) of the symmetry axis. Here, the authors show that all five parameters can be obtained from azimuthally varying P-wave NMO velocities measured for two reflectors with different dips and/or azimuths (one of the reflectors can be horizontal). The shear-wave velocity V{sub SO} in the symmetry direction, which has negligible influence on P-wave kinematic signatures, can be found only from the moveout of shear waves. Using the exact NMO equation, the authors examine the propagation of errors in observed moveout velocities into estimated values of the anisotropic parameters and establish the necessary conditions for a stable inversion procedure. Since the azimuthal variation of the NMO velocity is elliptical, each reflection event provides them with up to three constraints on the model parameters. Generally, the five parameters responsible for P-wave velocity can be obtained from two P-wave ellipses, but the feasibility of the moveout inversion strongly depends on the tilt {nu}. While most of the analysis is carried out for a single layer, the authors also extend the inversion algorithm to vertically heterogeneous TTI media above a dipping reflector using the generalized Dix equation. A synthetic example for a strongly anisotropic, stratified TTI medium demonstrates a high accuracy of the inversion.

Grechka, V.; Tsvankin, I.

2000-02-01T23:59:59.000Z

365

An Inverse Finite Element Analysis and A Parametric Study of Small Punch Tests  

E-Print Network [OSTI]

-displacement curve of 40CrNi2Mo alloy steel (Guan et al., 2011) ....... 21 Fig. 2.8 Estimate of the first step displacement ........................................................... 22 Fig. 2.9 FE simulation results with ? = 800 MPa at ? = 0...-strain curve of 40CrNi2Mo alloy steel from the inverse FE x analysis of the SPT ......................................................................................... 28 Fig. 2.18 1.25Cr0.5Mo alloy steel elastic modulus and yield...

Xu, Zhenzhen

2012-02-14T23:59:59.000Z

366

Inverse fixed energy scattering problem for the two-dimensional nonlinear Schroedinger operator  

E-Print Network [OSTI]

This work studies the direct and inverse fixed energy scattering problem for two-dimensional Schroedinger equation with rather general nonlinear index of refraction. In particular, using the Born approximation we prove that all singularities of the unknown compactly supported potential from $L^2$-space can be obtained uniquely by the scattering data with fixed positive energy. The proof is based on the new estimates for the Faddeev-Green's function in $L^\\infty$-space.

Georgios Fotopoulos; Valery Serov

2014-12-01T23:59:59.000Z

367

Optical imaging of phantoms from real data by an approximately globally convergent inverse algorithm  

E-Print Network [OSTI]

A numerical method for an inverse problem for an elliptic equation with the running source at multiple positions is presented. This algorithm does not rely on a good first guess for the solution. The so-called "approximate global convergence" property of this method is shown here. The performance of the algorithm is verified on real data for Diffusion Optical Tomography. Direct applications are in near-infrared laser imaging technology for stroke detection in brains of small animals.

Jianzhong Su; Michael V. Klibanov; Yueming Liu; Zhijin Lin; Natee Pantong; Hanli Liu

2012-08-25T23:59:59.000Z

368

Statistical inversion for medical x-ray tomography with few radiographs: II. Application to dental radiology  

Science Journals Connector (OSTI)

Diagnostic and operational tasks in dental radiology often require three-dimensional information that is difficult or impossible to see in a projection image. A CT-scan provides the dentist with comprehensive three-dimensional data. However, often CT-scan is impractical and, instead, only a few projection radiographs with sparsely distributed projection directions are available. Statistical (Bayesian) inversion is well-suited approach for reconstruction from such incomplete data. In statistical inversion, a priori information is used to compensate for the incomplete information of the data. The inverse problem is recast in the form of statistical inference from the posterior probability distribution that is based on statistical models of the projection data and the a priori information of the tissue. In this paper, a statistical model for three-dimensional imaging of dentomaxillofacial structures is proposed. Optimization and MCMC algorithms are implemented for the computation of posterior statistics. Results are given with in vitro projection data that were taken with a commercial intraoral x-ray sensor. Examples include limited-angle tomography and full-angle tomography with sparse projection data. Reconstructions with traditional tomographic reconstruction methods are given as reference for the assessment of the estimates that are based on the statistical model.

V Kolehmainen; S Siltanen; S Jrvenp; J P Kaipio; P Koistinen; M Lassas; J Pirttil; E Somersalo

2003-01-01T23:59:59.000Z

369

Robust inverse scattering full waveform seismic tomography for imaging complex structure  

SciTech Connect (OSTI)

Seismic tomography becomes important tool recently for imaging complex subsurface. It is well known that imaging complex rich fault zone is difficult. In this paper, The application of time domain inverse scattering wave tomography to image the complex fault zone would be shown on this paper, especially an efficient time domain inverse scattering tomography and their run in cluster parallel computer which has been developed. This algorithm is purely based on scattering theory through solving Lippmann Schwienger integral by using Born's approximation. In this paper, it is shown the robustness of this algorithm especially in avoiding the inversion trapped in local minimum to reach global minimum. A large data are solved by windowing and blocking technique of memory as well as computation. Parameter of windowing computation is based on shot gather's aperture. This windowing technique reduces memory as well as computation significantly. This parallel algorithm is done by means cluster system of 120 processors from 20 nodes of AMD Phenom II. Benchmarking of this algorithm is done by means Marmoussi model which can be representative of complex rich fault area. It is shown that the proposed method can image clearly the rich fault and complex zone in Marmoussi model even though the initial model is quite far from the true model. Therefore, this method can be as one of solution to image the very complex mode.

Nurhandoko, Bagus Endar B.; Sukmana, Indriani; Wibowo, Satryo; Deny, Agus; Kurniadi, Rizal; Widowati, Sri; Mubarok, Syahrul; Susilowati; Kaswandhi [Wave Inversion and Subsurface Fluid Imaging Research (WISFIR) Lab., Complex System Research Division, Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung. and Rock Fluid Imaging Lab., Rock Physics and Cluster C (Indonesia); Rock Fluid Imaging Lab., Rock Physics and Cluster Computing Center, Bandung (Indonesia); Physics Department of Institut Teknologi Bandung (Indonesia); Rock Fluid Imaging Lab., Rock Physics and Cluster Computing Center, Bandung, Indonesia and Institut Teknologi Telkom, Bandung (Indonesia); Rock Fluid Imaging Lab., Rock Physics and Cluster Computing Center, Bandung (Indonesia)

2012-06-20T23:59:59.000Z

370

Master of Science Thesis Minimal Critical Subsystems  

E-Print Network [OSTI]

catastrophic effects. For instance, a software flaw in a radiation therapy machine claimed the lives of six cancer patients [BK08, p.2]. The safety and reliability issues caused by software errors necessitate ro an increasing adoption of software in several industries such as the automotive industry, the aerospace industry

Ábrahám, Erika

371

The hydroelectric problem of porous rocks: inversion of the position of the water table from self-potential data  

Science Journals Connector (OSTI)

......Potential Field and Applied Geophysics The hydroelectric problem of porous rocks: inversion...Green's functions for the coupled hydroelectric problem yields an integral equation...water flow through the electrokinetic (hydroelectric) coupling (e.g. Jouniaux et al......

A. Revil; V. Naudet; J. D. Meunier

2004-11-01T23:59:59.000Z

372

Estimation of in-situ petrophysical properties from wireline formation tester and induction logging measurements: A joint inversion approach  

E-Print Network [OSTI]

-filtrate invasion and formation test. A fully implicit finite- difference black-oil reservoir simulator with brine noise-free and noise-contaminated synthetic data. Joint inversion results provide a quantitative proof

Torres-Verdín, Carlos

373

Ambient noise surface wave tomography to determine the shallow shear velocity structure at Valhall: depth inversion with a Neighbourhood Algorithm  

Science Journals Connector (OSTI)

......dispersion. 4.3 Construction of a hybrid model Adding a single additional...inversion results. Therefore, a final hybrid 3-D model is constructed only...resources provided by the European Grid Infrastructure. For more information, please......

A. Mordret; M. Lands; N. M. Shapiro; S. C. Singh; P. Roux

2014-01-01T23:59:59.000Z

374

High Frequency Inversion Capacitance Measurements for 6H-SiC n-MOS Capacitors from 450 to 600 C  

E-Print Network [OSTI]

we have focused on the regime of inversion biasing, where the electrical characteristics, where the electrical characteristics of the capacitor are dominated by minority carriers. Due was determined by monitoring the resistan

Ghosh, Ruby N.

375

Joint inversion of electrical and seismic data for Fracture char. and Imaging of Fluid Flow in Geothermal Systems  

Broader source: Energy.gov [DOE]

Joint inversion of electrical and seismic data for Fracture char. and Imaging of Fluid Flow in Geothermal Systems presentation at the April 2013 peer review meeting held in Denver, Colorado.

376

Compact x-ray source based on burst-mode inverse Compton scattering at 100kHz  

E-Print Network [OSTI]

A design for a compact x-ray light source (CXLS) with flux and brilliance orders of magnitude beyond existing laboratory scale sources is presented. The source is based on inverse Compton scattering of a high brightness ...

Bessuille, J.

377

The prevalence and clinical presentation of fibularis myofascial trigger points in the assessment and treatment of inversion ankle sprains.  

E-Print Network [OSTI]

??Thesis (M.Tech.:Chiropractic)-Dept. of Chiropractic, Durban University of Technology, 2007 121 leaves Ankle sprains account for 85% of all injuries to the ankle (Garrick, 1997). Inversion (more)

Van der Toorn, Ingrid

2007-01-01T23:59:59.000Z

378

On the feasibility to study inverse proximity effect in a single S/F bilayer by Polarized Neutron Reflectometry  

Science Journals Connector (OSTI)

Here we report on a feasibility study aiming to explore the potential of Polarized Neutron Reflectometry (PNR) for detecting the inverse proximity...T = 0.5T C ...

Yu. N. Khaydukov; B. Nagy; J. -H. Kim; T. Keller; A. Rhm; Yu. V. Nikitenko

2013-09-01T23:59:59.000Z

379

An analytical inversion method for determining regional and global emissions of greenhouse gases: Sensitivity studies and application to halocarbons  

E-Print Network [OSTI]

A new analytical inversion method has been developed to determine the regional and global emissions of long-lived atmospheric trace gases. It exploits in situ measurement data from three global networks and builds on ...

Stohl, A.

380

HIGH-ENERGY EMISSION OF GRB 130427A: EVIDENCE FOR INVERSE COMPTON RADIATION  

SciTech Connect (OSTI)

A nearby superluminous burst GRB 130427A was simultaneously detected by six ?-ray space telescopes (Swift, the Fermi GLAST Burst Monitor (GBM)/Large Area Telescope, Konus-Wind, SPI-ACS/INTEGRAL, AGILE, and RHESSI) and by three RAPTOR full-sky persistent monitors. The isotropic ?-ray energy release is ?10{sup 54} erg, rendering it the most powerful explosion among gamma-ray bursts (GRBs) with a redshift z ? 0.5. The emission above 100 MeV lasted about one day, and four photons are at energies greater than 40 GeV. We show that the count rate of 100 MeV-100 GeV emission may be mainly accounted for by the forward shock synchrotron radiation and the inverse Compton radiation likely dominates at GeV-TeV energies. In particular, an inverse Compton radiation origin is favored for the ?(95.3, 47.3, 41.4, 38.5, 32) GeV photons arriving at t ? (243, 256.3, 610.6, 3409.8, 34366.2) s after the trigger of Fermi-GBM. Interestingly, the external inverse Compton scattering of the prompt emission (the second episode, i.e., t ? 120-260 s) by the forward-shock-accelerated electrons is expected to produce a few ?-rays at energies above 10 GeV, while five were detected in the same time interval. A possible unified model for the prompt soft ?-ray, optical, and GeV emission of GRB 130427A, GRB 080319B, and GRB 090902B is outlined. Implications of the null detection of >1 TeV neutrinos from GRB 130427A by IceCube are discussed.

Fan, Yi-Zhong; Zhang, Fu-Wen; He, Hao-Ning; Zhou, Bei; Yang, Rui-Zhi; Jin, Zhi-Ping; Wei, Da-Ming [Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China); Tam, P. H. T. [Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan (China); Liang, Yun-Feng, E-mail: yzfan@pmo.ac.cn, E-mail: fwzhang@pmo.ac.cn, E-mail: dmwei@pmo.ac.cn [Department of Physics, Guangxi University, Guangxi 530004 (China)

2013-10-20T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Effective environments: Preparation of stationary states with inverse temperature ranging from positive to negative values  

E-Print Network [OSTI]

In this paper, we discuss how effective environments incorporating periodic measurements can be used to prepare a two-level system (TLS) in almost arbitrary thermal states: Concretely, we study a TLS coupled to a spin environment, the magnetization of which is measured periodically. In ensemble average these measurements cause a relaxation of the TLS into a thermal (diagonal) state. By adjusting the time between the measurements and the detuning of the environmental spins, the creation of very low temperatures as well as inversion becomes possible. Our analytical results derived for large environments are numerically shown to be valid even for quite small environments, down to only a few spins.

Thomas Jahnke; Gnter Mahler

2011-07-18T23:59:59.000Z

382

Interpreting Ulysses data using inverse scattering theory: Oblique Alfv\\'en waves  

E-Print Network [OSTI]

Solitary wave structures observed by the Ulysses spacecraft in the solar wind were analyzed using both inverse scattering theory as well as direct numerical integration of the derivative nonlinear Schr\\"odinger (DNLS) equation. Several of these structures were found to be consistent with soliton solutions of the DNLS equation. Such solitary structures have been commonly observed in the space plasma environment and may, in fact, be long-lived solitons. While the generation of these solitons may be due to an instability mechanism, e.g., the mirror instability, they may be observable far from the source region due to their coherent nature.

Wheeler, Harry R; Hamilton, R L

2015-01-01T23:59:59.000Z

383

Lensmem a gravitational lens inversion algorithm using the maximum entropy method  

E-Print Network [OSTI]

We present a new algorithm for inverting poorly resolved gravitational lens systems using the maximum entropy method (MEM). We test the method with simulations and then apply it to an 8 GHz VLA map of the radio ring lens MG1654+134. We model the lens as a singular isothermal sphere embedded in an external shear field and find the critical radius of the lens is b=0\\parcs9820, the dimensionless shear is \\gamma=0.0771, and the position angle of the shear is \\theta=100\\pdeg8. These results are consistent with the results obtained by Kochanek (1995) using a complementary inversion algorithm based on Clean.

Wallington, S; Narayan, R

1995-01-01T23:59:59.000Z

384

LensMEM: A Gravitational Lens Inversion Algorithm Using the Maximum Entropy Method  

E-Print Network [OSTI]

We present a new algorithm for inverting poorly resolved gravitational lens systems using the maximum entropy method (MEM). We test the method with simulations and then apply it to an 8 GHz VLA map of the radio ring lens MG1654+134. We model the lens as a singular isothermal sphere embedded in an external shear field and find the critical radius of the lens is $b=0\\parcs9820$, the dimensionless shear is $\\gamma=0.0771$, and the position angle of the shear is $\\theta=100\\pdeg8$. These results are consistent with the results obtained by Kochanek (1995) using a complementary inversion algorithm based on Clean.

S. Wallington; C. S. Kochanek; R. Narayan

1995-11-28T23:59:59.000Z

385

Inverse Cotton-Mouton effect of the Vacuum and of atomic systems  

E-Print Network [OSTI]

In this letter we calculate the Inverse Cotton-Mouton Effect (ICME) for the vacuum following the predictions of Quantum ElectroDynamics. We compare the value of this effect for the vacuum with the one expected for atomic systems. We finally show that ICME could be measured for the first time for noble gases using state-of-the-art laser systems and for the quantum vacuum with near-future laser facilities like ELI and HiPER, providing in particular a test of the nonlinear behaviour of quantum vacuum at intensities below the Schwinger limit of 4.5x10^33 W/m^2.

C. Rizzo; A. Dupays; R. Battesti; M. Fouch; G. L. J. A. Rikken

2010-05-04T23:59:59.000Z

386

Inverse Cotton-Mouton effect of the Vacuum and of atomic systems  

E-Print Network [OSTI]

In this letter we calculate the Inverse Cotton-Mouton Effect (ICME) for the vacuum following the predictions of Quantum ElectroDynamics. We compare the value of this effect for the vacuum with the one expected for atomic systems. We finally show that ICME could be measured for the first time for noble gases using state-of-the-art laser systems and for the quantum vacuum with near-future laser facilities like ELI and HiPER, providing in particular a test of the nonlinear behaviour of quantum vacuum at intensities below the Schwinger limit of 4.5x10^33 W/m^2.

Rizzo, C; Battesti, R; Fouch, M; Rikken, G L J A

2010-01-01T23:59:59.000Z

387

Sub-mm tests of the gravitational inverse-square law  

E-Print Network [OSTI]

Sub-mm tests of the gravitational inverse-square law are interesting from several quite different perspectives. This paper discusses work by the Eot-Wash group performed since the publication of our initial result in February 2001. We find no evidence for short-range Yukawa interactions. Our results provide an upper limit of 200 micrometers on the size of the largest ``extra'' dimension, and for the unification scenario with 2 large extra dimensions, set an upper limit of 150 micrometers on the size of those dimensions.

E. G. Adelberger

2002-02-02T23:59:59.000Z

388

Inverse spin Hall effect induced by spin pumping into semiconducting ZnO  

SciTech Connect (OSTI)

The inverse spin Hall effect (ISHE) of n-type semiconductor ZnO thin films with weak spin-orbit coupling has been observed by utilizing the spin pumping method. In the ferromagnetic resonance condition, the spin pumping driven by the dynamical exchange interaction of a permalloy film injects a pure spin current into the adjacent ZnO layer. This spin current gives rise to a DC voltage through the ISHE in the ZnO layer, and the DC voltage is proportional to the microwave excitation power. The effect is sizeable even when the spin backflow is considered.

Lee, Jung-Chuan [Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China); Huang, Leng-Wei [Graduate Institute of Applied Physics, National Chengchi University, Taipei 11605, Taiwan (China); Hung, Dung-Shing, E-mail: dshung@mail.mcu.edu.tw [Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China); Department of Information and Telecommunications Engineering, Ming Chuan University, Taipei 111, Taiwan (China); Chiang, Tung-Han [Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan (China); Huang, J. C. A., E-mail: jcahuang@mail.ncku.edu.tw [Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan (China); Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan (China); Liang, Jun-Zhi [Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan (China); Department of Physics, Fu Jen Catholic University, Taipei 242, Taiwan (China); Lee, Shang-Fan, E-mail: leesf@phys.sinica.edu.tw [Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China); Graduate Institute of Applied Physics, National Chengchi University, Taipei 11605, Taiwan (China)

2014-02-03T23:59:59.000Z

389

High-resolution inverse Raman and resonant-wave-mixing spectroscopy  

SciTech Connect (OSTI)

These research activities consist of high-resolution inverse Raman spectroscopy (IRS) and resonant wave-mixing spectroscopy to support the development of nonlinear-optical techniques for temperature and concentration measurements in combustion research. Objectives of this work include development of spectral models of important molecular species needed to perform coherent anti-Stokes Raman spectroscopy (CARS) measurements and the investigation of new nonlinear-optical processes as potential diagnostic techniques. Some of the techniques being investigated include frequency-degenerate and nearly frequency-degenerate resonant four-wave-mixing (DFWM and NDFWM), and resonant multi-wave mixing (RMWM).

Rahn, L.A. [Sandia National Laboratories, Livermore, CA (United States)

1993-12-01T23:59:59.000Z

390

Final Version: Orbital Specificity in the Unoccupied States of UO2 from Resonant Inverse Photoelectron Spectroscopy  

SciTech Connect (OSTI)

One of the crucial questions of all actinide electronic structure determinations is the issue of 5f versus 6d character and the distribution of these components across the density of states. Here, a break-though experiment is discussed, which has allowed the direct determination of the U5f and U6d contributions to the unoccupied density of states (UDOS) in Uranium Dioxide. A novel Resonant Inverse Photoelectron (RIPES) and X-ray Emission Spectroscopy (XES) investigation of UO{sub 2} is presented. It is shown that the U5f and U6d components are isolated and identified unambiguously.

Tobin, J G; Yu, S W

2012-03-12T23:59:59.000Z

391

Quantum interference controlled resonance profiles: From lasing without inversion to photo-detection  

E-Print Network [OSTI]

In this work we report a quantum interference mediated control of the resonance profiles in a generic three-level system and investigate its effect on key quantum interference (QI) phenomena. Namely in a three level configuration with doublets in the ground or excited states, we show control over enhancement and suppression of the emission (absorption) profiles. This is achieved by manipulation of the strength of QI and the energy spacing of the doublets. We analyze the application of such QI induced control of the resonance profile in the framework of two limiting cases of lasing without inversion and photo-detection.

Konstantin E. Dorfman; Pankaj K. Jha; Sumanta Das

2011-08-07T23:59:59.000Z

392

Inverse diffraction for the Atmospheric Imaging Assembly in the Solar Dynamics Observatory  

E-Print Network [OSTI]

The Atmospheric Imaging Assembly in the Solar Dynamics Observatory provides full Sun images every 1 seconds in each of 7 Extreme Ultraviolet passbands. However, for a significant amount of these images, saturation affects their most intense core, preventing scientists from a full exploitation of their physical meaning. In this paper we describe a mathematical and automatic procedure for the recovery of information in the primary saturation region based on a correlation/inversion analysis of the diffraction pattern associated to the telescope observations. Further, we suggest an interpolation-based method for determining the image background that allows the recovery of information also in the region of secondary saturation (blooming).

Torre, Gabriele; Benvenuto, Federico; Massone, Anna Maria; Piana, Michele

2015-01-01T23:59:59.000Z

393

Structured x-ray beams from twisted electrons by inverse Compton scattering of laser light  

E-Print Network [OSTI]

The inverse Compton scattering of laser light on high-energetic twisted electrons is investigated with the aim to construct spatially structured x-ray beams. In particular, we analyze how the properties of the twisted electrons, such as the topological charge and aperture angle of the electron Bessel beam, affects the energy and angular distribution of scattered x-rays. We show that with suitably chosen initial twisted electron states one can synthesize tailor-made x-ray beam profiles with a well-defined spatial structure, in a way not possible with ordinary plane-wave electron beams.

Seipt, D; Fritzsche, S

2014-01-01T23:59:59.000Z

394

A Study of Gasification of Municipal Solid Waste Using a Double Inverse Diffusion Flame Burner  

Science Journals Connector (OSTI)

A Study of Gasification of Municipal Solid Waste Using a Double Inverse Diffusion Flame Burner ... Furthermore, the experiences of the waste incineration industry driven in the past by regulatory as well as technical issues may facilitate their commercial potentials outside the common market, especially in highly populated developing countries such as Korea with scarce landfill sites. ... Recently, several new technologies that involve gasification or combinations of pyrolysis, combustion, and gasification processes are currently being brought into the market for energy-efficient, environmentally friendly and economically sound methods of thermal processing of wastes. ...

Tae-Heon Kwak; Seungmoon Lee; Sanjeev Maken; Ho-Chul Shin; Jin-Won Park; Young Done Yoo

2005-08-24T23:59:59.000Z

395

Effect of Doppler broadening on optical gain without inversion in a four-level model  

Science Journals Connector (OSTI)

We discuss the effect of Doppler broadening on the gain and refractive index experienced by an optical probe when passing through a collection of atoms in the absence of a population inversion. We calculate the gain-absorption spectrum of the medium when the atoms have a Maxwell velocity distribution and compare the atomic response when the pump and probe beams are arranged in copropagating and counterpropagating configurations. The results in these two cases can be qualitatively very different from each other, as we show with the help of numerical calculations. A physical interpretation and the conditions for the validity of the results are provided.

De-Zhong Wang and Jin-Yue Gao

1995-10-01T23:59:59.000Z

396

Direct Use of Satellite Sounding Radiances in Numerical Weather Prediction  

Science Journals Connector (OSTI)

Since 1978, operational satellite soundings of the atmospheres temperature and humidity structure have been provided by the TIROS Operational Vertical Sounder (TONS) on the TIROS-N/NOAA series of polar orbiti...

J. R. Eyre; E. Andersson; A. P. McNally

1993-01-01T23:59:59.000Z

397

Magnetic topology and current channels in plasmas with toroidal current density inversions  

SciTech Connect (OSTI)

The equilibrium magnetic field inside axisymmetric plasmas with inversions on the toroidal current density is considered. Previous works have shown that internal regions with negative current density lead to non-nested magnetic surfaces inside the plasma. Following these results, we derive a general expression relating the positive and negative currents inside the non-nested surfaces. This is done in terms of an anisotropy parameter that is model-independent and is based in very general properties of the magnetic field. We demonstrate that the positive currents in axisymmetric islands screen the negative one in the plasma center by reaching about twice its magnitude. Further, we illustrate these results by developing a family of analytical local solutions for the poloidal magnetic field in a region of interest that contains the inverted current. These local solutions exhibit non-nested magnetic surfaces with a combined current of at least twice the magnitude of the negative one, as prescribed from the topological arguments, and allow to study topological transitions driven by geometrical changes in the current profile. To conclude, we discuss the signatures of internal current density inversions in a confinement device and show that magnetic pitch measurements may be inappropriate to differentiate current reversals and small current holes in plasmas.

Ciro, D.; Caldas, I. L. [Departamento de Fsica Aplicada, Universidade de So Paulo, 05508-090 So Paulo (Brazil)] [Departamento de Fsica Aplicada, Universidade de So Paulo, 05508-090 So Paulo (Brazil)

2013-10-15T23:59:59.000Z

398

COLLECTIVE EVIDENCE FOR INVERSE COMPTON EMISSION FROM EXTERNAL PHOTONS IN HIGH-POWER BLAZARS  

SciTech Connect (OSTI)

We present the first collective evidence that Fermi-detected jets of high kinetic power (L{sub kin}) are dominated by inverse Compton emission from upscattered external photons. Using a sample with a broad range in orientation angle, including radio galaxies and blazars, we find that very high power sources (L{sub kin} > 10{sup 45.5} erg s{sup -1}) show a significant increase in the ratio of inverse Compton to synchrotron power (Compton dominance) with decreasing orientation angle, as measured by the radio core dominance and confirmed by the distribution of superluminal speeds. This increase is consistent with beaming expectations for external Compton (EC) emission, but not for synchrotron self-Compton (SSC) emission. For the lowest power jets (L{sub kin} < 10{sup 43.5} erg s{sup -1}), no trend between Compton and radio core dominance is found, consistent with SSC. Importantly, the EC trend is not seen for moderately high power flat spectrum radio quasars with strong external photon fields. Coupled with the evidence that jet power is linked to the jet speed, this finding suggests that external photon fields become the dominant source of seed photons in the jet comoving frame only for the faster and therefore more powerful jets.

Meyer, Eileen T.; Fossati, Giovanni [Department of Physics and Astronomy, Rice University, Houston, TX 77005 (United States); Georganopoulos, Markos [Department of Physics, Joint Center for Astrophysics, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250 (United States); Lister, Matthew L. [Department of Physics, Purdue University, 525 Northwestern Avenue, West Lafayette, IN 47907 (United States)

2012-06-10T23:59:59.000Z

399

Inverse kinematics for optimal tool orientation control in 5-axis CNC machining  

Science Journals Connector (OSTI)

Abstract The problem of determining the inputs to the rotary axes of a 5-axis CNC machine is addressed, such that relative variations of orientation between the tool axis and surface normal are minimized subject to the constraint of maintaining a constant cutting speed with a ball-end tool. In the context of an orientable-spindle machine, the results of a prior study are directly applicable to the solution of this inverse-kinematics problem. However, since they are expressed in terms of the integral of the geodesic curvature, a discrete time-step solution is proposed that yields accurate rotary-axis increments at high sampling frequencies. For an orientable-table machine, a closed-form solution that specifies the rotary-axis positions as functions of the surface normal variation along the toolpath is possible. In this context, however, the feasibility of a solution is dependent upon the surface normal along the toolpath satisfying certain orientational constraints. These inverse-kinematics solutions facilitate accurate and efficient 5-axis machining of free-form surfaces without unnecessary actuation of the machine rotary axes.

Rida T. Farouki; Chang Yong Han; Shiqiao Li

2014-01-01T23:59:59.000Z

400

Estimating permeability from quasi-static deformation: Temporal variations and arrival time inversion  

SciTech Connect (OSTI)

Transient pressure variations within a reservoir can be treated as a propagating front and analyzed using an asymptotic formulation. From this perspective one can define a pressure 'arrival time' and formulate solutions along trajectories, in the manner of ray theory. We combine this methodology and a technique for mapping overburden deformation into reservoir volume change as a means to estimate reservoir flow properties, such as permeability. Given the entire 'travel time' or phase field, obtained from the deformation data, we can construct the trajectories directly, there-by linearizing the inverse problem. A numerical study indicates that, using this approach, we can infer large-scale variations in flow properties. In an application to Interferometric Synthetic Aperture (InSAR) observations associated with a CO{sub 2} injection at the Krechba field, Algeria, we image pressure propagation to the northwest. An inversion for flow properties indicates a linear trend of high permeability. The high permeability correlates with a northwest trending fault on the flank of the anticline which defines the field.

Vasco, D.W.; Ferretti, Alessandro; Novali, Fabrizio

2008-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Properties of solar plage from a spatially coupled inversion of Hinode SP data  

E-Print Network [OSTI]

The properties of magnetic fields forming an extended plage region in AR 10953 were investigated. Stokes spectra of the Fe I line pair at 6302 \\AA recorded by the spectropolarimeter aboard the Hinode satellite were inverted using the SPINOR code. The code performed a 2D spatially coupled inversion on the Stokes spectra, allowing the retrieval of gradients in optical depth within the atmosphere of each pixel, whilst accounting for the effects of the instrument's PSF. Consequently, no magnetic filling factor was needed. The inversion results reveal that plage is composed of magnetic flux concentrations (MFCs) with typical field strengths of 1520 G at log(\\tau)=-0.9 and inclinations of 10-15 degrees. The MFCs expand by forming magnetic canopies composed of weaker and more inclined magnetic fields. The expansion and average temperature stratification of isolated MFCs can be approximated well with an empirical plage thin flux-tube model. The highest temperatures of MFCs are located at their edges in all log(\\tau) ...

Buehler, D; Solanki, S K; van Noort, M

2015-01-01T23:59:59.000Z

402

Stellar acoustic radii, mean densities and ages from seismic inversion techniques  

E-Print Network [OSTI]

Context. Determining stellar characteristics such as the radius, the mass or the age is crucial when studying stellar evolution, exoplanetary systems or characterising stellar populations in the Galaxy. Asteroseismology is the golden path to accurately obtain these characteristics. In this context, a key question is how to make these methods less model-dependant. Aims. Building on the work of Reese et al. (2012), we wish to extend the SOLA inversion technique to new stellar global characteristics in addition to the mean density. The goal is to provide a general framework in which to estimate these characteristics as accurately as possible in low mass main sequence stars. Methods. First, we describe our framework and discuss the reliability of the inversion technique and the possible sources of error.We then apply this methodology to the acoustic radius, an age indicator based on the sound speed derivative and the mean density and compare it to estimates based on the average large and small frequency separatio...

Buldgen, Gal; Dupret, Marc-Antoine; Samadi, Rza

2014-01-01T23:59:59.000Z

403

Singing with yourself: Evidence for an inverse modeling account of poor-pitch singing  

Science Journals Connector (OSTI)

Abstract Singing is a ubiquitous and culturally significant activity that humans engage in from an early age. Nevertheless, some individuals termed poor-pitch singers are unable to match target pitches within a musical semitone while singing. In the experiments reported here, we tested whether poor-pitch singing deficits would be reduced when individuals imitate recordings of themselves as opposed to recordings of other individuals. This prediction was based on the hypothesis that poor-pitch singers have not developed an abstract inverse model of the auditoryvocal system and instead must rely on sensorimotor associations that they have experienced directly, which is true for sequences an individual has already produced. In three experiments, participants, both accurate and poor-pitch singers, were better able to imitate sung recordings of themselves than sung recordings of other singers. However, this self-advantage was enhanced for poor-pitch singers. These effects were not a byproduct of self-recognition (Experiment 1), vocal timbre (Experiment 2), or the absolute pitch of target recordings (i.e., the advantage remains when recordings are transposed, Experiment 3). Results support the conceptualization of poor-pitch singing as an imitative deficit resulting from a deficient inverse model of the auditoryvocal system with respect to pitch.

Peter Q. Pfordresher; James T. Mantell

2014-01-01T23:59:59.000Z

404

Spherical and ellipsoidal volcanic sources at Long Valley caldera, California, using a genetic algorithm inversion technique  

Science Journals Connector (OSTI)

We model the second inflation period at Long Valley caldera, California using a genetic algorithm technique and high quality geodetic measurements of elevation changes and baseline extensions. We compare two source inversions for both spherical Mogi point sources and the finite prolate ellipsoid of Yang and Davis. A sensitivity analysis for the genetic algorithm is performed based upon synthetic data set inversions on similar sources in order to better constrain the areal location, orientation, and volume of the potential sources. The spherical sources are well constrained, the larger located at 9.9km beneath the resurgent dome, with a volume of 0.036km3, while the second, at only 0.008km3, is located at a depth of 7.3km beneath the south moat. The depths to the ellipsoidal sources are switched, with the larger source at a depth of 9.6km and the smaller at 11.8km, with volumes of 0.037 and 0.002km3, respectively.

K.F Tiampo; J.B Rundle; J Fernandez; J.O Langbein

2000-01-01T23:59:59.000Z

405

Dynamic Inversion for Hydrological Process Monitoring with Electrical Resistance Tomography Under Model Uncertainty  

SciTech Connect (OSTI)

We propose an approach for imaging the dynamics of complex hydrological processes. The evolution of electrically conductive fluids in porous media is imaged using time-lapse electrical resistance tomography. The related dynamic inversion problem is solved using Bayesian filtering techniques, that is, it is formulated as a sequential state estimation problem in which the target is an evolving posterior probability density of the system state. The dynamical inversion framework is based on the state space representation of the system, which involves the construction of a stochastic evolution model and an observation model. The observation model used in this paper consists of the complete electrode model for ERT, with Archie's law relating saturations to electrical conductivity. The evolution model is an approximate model for simulating flow through partially saturated porous media. Unavoidable modeling and approximation errors in both the observation and evolution models are considered by computing approximate statistics for these errors. These models are then included in the construction of the posterior probability density of the estimated system state. This approximation error method allows the use of approximate - and therefore computationally efficient - observation and evolution models in the Bayesian filtering. We consider a synthetic example and show that the incorporation of an explicit model for the model uncertainties in the state space representation can yield better estimates than a frame-by-frame imaging approach.

Lehikoinen, A.; Huttunen, J.M.J.; Finsterle, S.; Kowalsky, M.B.; Kaipio, J.P.

2009-08-01T23:59:59.000Z

406

Flaw Shape Reconstruction from SH-Wave Array Ultrasonic Data Using Time Domain Linearized Inverse Scattering Method  

SciTech Connect (OSTI)

A linearized inverse scattering method, so called the Kirchhoff inversion, is formulated in time domain for SH-waves measured by a contact ultrasonic transducer and tested using experimental data. The data for reconstruction are experimentally obtained by measuring ultrasonic echoes from artificial flaws in steel plate specimens. For an efficient and accurate data collection, a contact SH-wave linear array transducer is used. The shapes of the artificial flaws are reconstructed by the Kirchhoff inversion and the conventional SAFT (Synthetic Aperture Focusing Technique) using the waves from a single ray path. Comparison of the two methods shows that the Kirchhoff inversion works well for experimental data and outperforms SAFT although only an illuminated portion of the flaw boundaries is reconstructed by either method. In order to gain more information on the flaw boundaries, the Kirchhoff inversion which takes into account multiple ray paths is also tested with the same experimental data. As a result, it is shown that a larger part of the flaw boundaries can be visualized by considering the multiple ray paths.

Kimoto, K.; Hirose, S. [Department of Mechanical and Environmental Informatics, Graduate School of Information Science and Engineering, Tokyo Institute of Technology 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552 (Japan)

2005-04-09T23:59:59.000Z

407

A transmission electron microscopy investigation of inverse melting in Nb{sub 45}Cr{sub 55}  

SciTech Connect (OSTI)

In inverse melting, a supersaturated crystalline phase transforms polymorphously under heat treatment to the amorphous state. Inverse melting of body-centered cubic (bcc) Nb{sub 45}Cr{sub 55} is studied using transmission electron microscopy (TEM) and high resolution TEM (HRTEM). The crystalline to amorphous transformation is heterogeneous, initiating at the bcc grain boundaries. HRTEM reveals 2-3 nm domains with medium range order (MRO) in the amorphous phase. Preferred orientation of MRO domains is found on a scale corresponding to the precursor bcc grain size. Using HRTEM and calorimetry, MRO development in cosputtered Nb{sub 45}Cr{sub 55} films is characterized and compared to that in the amorphous phase produced by inverse melting. {copyright} {ital 1997 Materials Research Society.}

Sinkler, W.; Michaelsen, C.; Bormann, R. [Institute for Materials Research, GKSS Research Center, 21502 Geesthacht (Germany)

1997-07-01T23:59:59.000Z

408

Iron-57 nuclear magnetic resonance chemical shifts of hindered iron porphyrins. Ruffling as a possible mechanism for d-orbital energy level inversion  

Science Journals Connector (OSTI)

Iron-57 nuclear magnetic resonance chemical shifts of hindered iron porphyrins. ... Ruffling as a possible mechanism for d-orbital energy level inversion ...

Lars Baltzer; Marie Landergren

1990-03-01T23:59:59.000Z

409

Verification, optimization and refinement of a direct-inverse transonic wing design method including weak viscous interaction  

E-Print Network [OSTI]

and Refinement of a. Direct-Inverse Transonic Wing Design Method Including Weak Viscous Interaction. (August 1989) Robert R. Ratcliff, B. S. , Texas A&M University Chair oi' Advisory Committee: Dr. Leland A. Carlson New developments in the direct-inverse wing... AND DISCUSSION . 92 VI V. 1 Bound&ary L&iyer and Wake Effects . . V. 2 Spanwise Grid Skewness V. 3 Wing Planform Effects V. 4 Initial Profile Efi'ects V. 5 Pressure Distribution Compatibility V. 6 Grid Refinement Effects . . V. 7 Fixed Trailing Edge...

Ratcliff, Robert R.

2012-06-07T23:59:59.000Z

410

On the GCR intensity and the inversion of the heliospheric magnetic field during the periods of the high solar activity  

E-Print Network [OSTI]

We consider the long-term behavior of the solar and heliospheric parameters and the GCR intensity in the periods of high solar activity and the inversions of heliospheric magnetic field (HMF). The classification of the HMF polarity structures and the meaning of the HMF inversion are discussed. The procedure is considered how to use the known HMF polarity distribution for the GCR intensity modeling during the periods of high solar activity. We also briefly discuss the development and the nearest future of the sunspot activity and the GCR intensity in the current unusual solar cycle 24.

Krainev, M B

2014-01-01T23:59:59.000Z

411

Identification of Friction Parameters from the Inverse Analysis of a Direct Extrusion Test  

SciTech Connect (OSTI)

This work proposes to use a special upsetting test and an optimal direct extrusion one performed to identify the constitutive equation of the material behavior and the friction coefficients directly from the load-stroke curves. The proposed friction test has the advantage to permit to take into account contact phenomena corresponding to new specimen surfaces created during a real bulk cold forming process. A lot of numerical simulations are made with the commercial software FORGE2 in order to study the influence of some design and process parameters. Different friction laws will be identified starting from the classical Coulomb and Tresca ones. All the parameter identifications are made using the Inverse Analysis principle.

Adinel, Gavrus; Thien, Pham Duc [LGCGM Laboratory, EA 3913, INSA de RENNES, UEB, CS70839, F-35708, Rennes-Cedex 7 (France); Henri, Francillette [SCR/CM, UMR 6226, INSA de RENNES, UEB, CS70839, F-35708, Rennes-Cedex 7 (France)

2011-01-17T23:59:59.000Z

412

Nonlinear inverse synthesis for high spectral efficiency transmission in optical fibers  

E-Print Network [OSTI]

In linear communication channels, spectral components (modes) defined by the Fourier transform of the signal propagate without interactions with each other. In certain nonlinear channels, such as the one modelled by the classical nonlinear Schr\\"odinger equation, there are nonlinear modes (nonlinear signal spectrum) that also propagate without interacting with each other and without corresponding nonlinear cross talk; effectively, in a linear manner. Here, we describe in a constructive way how to introduce such nonlinear modes for a given input signal. We investigate the performance of the nonlinear inverse synthesis (NIS) method, in which the information is encoded directly onto the continuous part of the nonlinear signal spectrum. This transmission technique, combined with the appropriate distributed Raman amplification, can provide an effective eigenvalue division multiplexing with high spectral efficiency, thanks to highly suppressed channel cross talk. The proposed NIS approach can be integrated with any...

Le, Son Thai; Turitsyn, Sergei K

2014-01-01T23:59:59.000Z

413

Constraints on Light Pseudoscalars Implied by Tests of the Gravitational Inverse-Square Law  

E-Print Network [OSTI]

The exchange of light pseudoscalars between fermions leads to a spin-independent potential in order g^4, where g is the Yukawa pseudoscalar-fermion coupling constant. This potential gives rise to detectable violations of both the weak equivalence principle (WEP) and the gravitational inverse-square law (ISL), even if g is quite small. We show that when previously derived WEP constraints are combined with those arisingfrom ISL tests, a direct experimental limit on the Yukawa coupling of light pseudoscalars to neutrons can be inferred for the first time (g_n^2/4pi < 1.6 \\times 10^-7), along with a new (and significantly improved) limit on the coupling of light pseudoscalars to protons.

Ephraim Fischbach; Dennis E. Krause

1999-06-03T23:59:59.000Z

414

Inverse seesaw in NMSSM and 126 GeV Higgs boson  

Science Journals Connector (OSTI)

We consider extensions of the next-to-minimal supersymmetric model (NMSSM) in which the observed neutrino masses are generated through a TeV scale inverse seesaw mechanism. The new particles associated with this mechanism can have sizable couplings to the Higgs field which can yield a large contribution to the mass of the lightest CP-even Higgs boson. With this new contribution, a 126 GeV Higgs is possible along with order of 200 GeV masses for the stop quarks for a broad range of tan?. The Higgs production and decay in the diphoton channel can be enhanced due to this new contribution. It is also possible to solve the little hierarchy problem in this model without invoking a maximal value for the NMSSM trilinear coupling and without severe restrictions on the value of tan?.

Ilia Gogoladze; Bin He; Qaisar Shafi

2013-01-01T23:59:59.000Z

415

IBIS: An inverse geometry Brillouin inelastic neutron spectrometer for the SNS  

SciTech Connect (OSTI)

The high power target station at the Spallation Neutron Source (SNS) currently has about 20 completed neutron scattering instruments. With a broad coverage of the momentum transfer (Q)-energy (E) space, these instruments serve an extensive user community. In an effort to further expand the scientific capabilities of the SNS instrument suites, we propose a low background, inverse geometry Brillouin inelastic spectrometer for the SNS which will expand the Q-E coverage of the current instrument suite and facilitate the study of inelastic and quasi-elastic scatterings at low Q values. The possible location for the proposed instrument is either beamline 8 which views the decoupled water moderator, or beamline 14A, which views a cold, coupled super critical hydrogen moderator. The instrument parameters, optimizations, and performances at these two beamline locations are discussed.

Zhao, J. K.; Robertson, Lee; Herwig, Kenneth W. [Instrument and Source Development Division, Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Wildgruber, Christoph U. [Chemical and Engineering Division, Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

2013-02-15T23:59:59.000Z

416

Inverse Sensitivity/Uncertainty Methods Development for Nuclear Fuel Cycle Applications  

Science Journals Connector (OSTI)

Abstract The Standardized Computer Analyses for Licensing Evaluation (SCALE) software package developed at the Oak Ridge National Laboratory includes codes that propagate uncertainties available in the nuclear data libraries to compute uncertainties in nuclear application performance parameters. We report on our recent efforts to extend this capability to develop an inverse sensitivity/uncertainty (IS/U) methodology that identifies the improvements in nuclear data that are needed to compute application responses within prescribed tolerances, while minimizing the cost of such data improvements. We report on our progress to date and present a simple test case for our method. Our methodology is directly applicable to thermal and intermediate neutron energy systems because it addresses the implicit neutron resonance self-shielding effects that are essential to accurate modeling of thermal and intermediate systems. This methodology is likely to increase the efficiency of nuclear data efforts.

G. Arbanas; M.E. Dunn; M.L. Williams

2014-01-01T23:59:59.000Z

417

Narrowband inverse Compton scattering x-ray sources at high laser intensities  

E-Print Network [OSTI]

Narrowband x- and gamma-ray sources based on the inverse Compton scattering of laser pulses suffer from a limitation of the allowed laser intensity due to the onset of nonlinear effects that increase their bandwidth. It has been suggested that laser pulses with a suitable frequency modulation could compensate this ponderomotive broadening and reduce the bandwidth of the spectral lines, which would allow to operate narrowband Compton sources in the high-intensity regime. In this paper we, therefore, present the theory of nonlinear Compton scattering in a frequency modulated intense laser pulse. We systematically derive the optimal frequency modulation of the laser pulse from the scattering matrix element of nonlinear Compton scattering, taking into account the electron spin and recoil. We show that, for some particular scattering angle, an optimized frequency modulation completely cancels the ponderomotive broadening for all harmonics of the backscattered light. We also explore how sensitive this compensation ...

Seipt, D; Surzhykov, A; Fritzsche, S

2014-01-01T23:59:59.000Z

418

Fast Inverse Nonlinear Fourier Transform For Generating Multi-Solitons In Optical Fiber  

E-Print Network [OSTI]

The achievable data rates of current fiber-optic wavelength-division-multiplexing (WDM) systems are limited by nonlinear interactions between different subchannels. Recently, it was thus proposed to replace the conventional Fourier transform in WDM systems with an appropriately defined nonlinear Fourier transform (NFT). The computational complexity of NFTs is a topic of current research. In this paper, a fast inverse NFT algorithm for the important special case of multi-solitonic signals is presented. The algorithm requires only $\\mathcal{O}(D\\log^{2}D)$ floating point operations to compute $D$ samples of a multi-soliton. To the best of our knowledge, this is the first algorithm for this problem with $\\log^{2}$-linear complexity. The paper also includes a many samples analysis of the generated nonlinear Fourier spectra.

Wahls, Sander

2015-01-01T23:59:59.000Z

419

Nuclear Magnetic Resonance Inverse Spectra of InGaAs Quantum Dots: Atomistic Level Structural Information  

E-Print Network [OSTI]

A wealth of atomistic information is buried within a self-assembled quantum dot (QD), carrying the legacy of its chemical composition and the growth history. In the presence of quadrupolar nuclei, as in InGaAs QDs, much of this is inherited to nuclear spins. With this computational study, we identify what sorts of atomistic information can be tapped from a single InGaAs QD, as probed optically by the recently introduced highly sensitive inverse spectra nuclear magnetic resonance technique. To capture the fingerprints of alloying in the spectra, we compare In0.2Ga0.8As QD with the compound InAs QD of the same shape, as well as performing a search over the parameter space of the inverse spectra technique. We display how both the elemental nuclear properties and local bonding take roles. The arsenic nuclei with their small gyromagnetic ratio are the most vulnerable to strain at a given magnetic field. Furthermore, because of their large S44 gradient elastic tensor components, the deviation of the major electric field gradient axis from the static magnetic field is also the largest. Moreover, this axial tilting has a big variance caused by the availability of various arsenic-centric nearest-neighbor configurations under cation alloying. We identify that a signature of alloying as opposed to segregated binaries within the QD is a peak that appears like an additional satellite transition of 75As. The local chemical and strain environment distinctly affect the isotopic line profiles, in particular the central transitions, for which we provide an in-depth analysis. We demonstrate the possibility of restoring to a large extend a monoenergetic distribution of isotopic nuclear spins by simply tilting the sample within a range of angles with respect to static magnetic field.

Ceyhun Bulutay; E. A. Chekhovich; A. I. Tartakovskii

2014-08-02T23:59:59.000Z

420

National Ignition Facility subsystem design requirements laser auxiliary subsystem SSDR 1.3.5  

SciTech Connect (OSTI)

This system design requirement document establishes the performance, design, development and test requirements for the NIF Laser Auxiliary Systems. The Laser Auxiliary Systems consist of: a. Gas Cooling System; b. Low conductivity cooling water system; C. Deionized cooling water system; d. Electrical power distribution system. The gas cooling system will be used for cooling the main laser amplifier flashlamps and some smaller quantities will be used for purging Pockels cells and for diode pumps in preamplifier. The low conductivity cooling water system will be used for cooling the capacitor banks. The deionized cooling water system will be used to cool the multi-pass amplifier in the OPG PAM. Electrical power will be required for the OPG systems, Pockels cells, power conditioning, and amplifier support equipment.

Mukherji, S.

1996-10-24T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

National Ignition Facility subsystem design requirements target diagnostics subsystem SSDR 1.8.3  

SciTech Connect (OSTI)

This SSDR establishes the performance, design, development and test requirements for the Target Experimental System`s Diagnostic, WBS 1.8. 3. This includes the individual diagnostic components, the Target Diagnostic Data Acquisition System (Target DAS), the diagnostic vacuum system, the timing/fiducial system, and the EMI protection system.

Lee, D.

1996-10-28T23:59:59.000Z

422

Carbon sequestration monitoring with acoustic double-difference waveform inversion: A case study on SACROC walkaway VSP data  

E-Print Network [OSTI]

Carbon sequestration monitoring with acoustic double-difference waveform inversion: A case study National Laboratory SUMMARY Geological carbon sequestration involves large-scale injection of carbon is crucial for ensuring safe and reliable carbon storage (Bickle et al., 2007). Conventional analysis of time

Malcolm, Alison

423

Multicomponent pre-stack seismic waveform inversion in transversely isotropic media using a non-dominated sorting genetic algorithm  

Science Journals Connector (OSTI)

......Anisotropic (VTI) model For the anisotropic case, we used the same...isotropic inversion but added anisotropic parameters to the Baxter shale region of the model that...When we assumed the Baxter shale to be anisotropic and added VTI parameters......

Amit Padhi; Subhashis Mallick

2014-01-01T23:59:59.000Z

424

Gauss-Jordan Method (GJ) Matrix Multiplication Linear Independence (LI) Rank Inverse Math 364: Principles of Optimization, Lecture 2  

E-Print Network [OSTI]

Gauss-Jordan Method (GJ) Matrix Multiplication Linear Independence (LI) Rank Inverse Math 364 University Spring 2012 Haijun Li Math 364: Principles of Optimization, Lecture 2 Spring 2012 1 / 15 #12;Gauss-Jordan and methods from linear algebra, including Gauss-Jordan method, matrix multiplication, linear independence

Li, Haijun

425

Velocity model-building by 3D frequency-domain, full-waveform inversion of wide-aperture seismic data  

E-Print Network [OSTI]

Velocity model-building by 3D frequency-domain, full-waveform inversion of wide-aperture seismic, any approach that helps to auto- mate and optimize velocity model-building will speed up the output . The most common approaches for building a PSDM velocity model rely on reflection traveltime tomography e

Vallée, Martin

426

Upper mantle structure of South America from joint inversion of waveforms and fundamental mode group velocities of Rayleigh waves  

E-Print Network [OSTI]

Upper mantle structure of South America from joint inversion of waveforms and fundamental mode tomographic S wave velocity model for the upper mantle beneath South America is presented. We developed three-dimensional (3-D) upper mantle S velocity model and a Moho depth model for South America, which

van der Lee, Suzan

427

Inverse modeling of emissions for local photo-oxidant pollution : Testing a new methodology with kriging constraints  

E-Print Network [OSTI]

Inverse modeling of emissions for local photo-oxidant pollution : Testing a new methodology. Abstract For chemistry-transport models operating at regional scales, surface emissions are the input data a methodology to optimize surface emissions at local scale i.e. to compute correction factors for the available

Menut, Laurent

428

Timing and Tectonic implications of basin inversion in the Nam Con Son Basin and adjacent areas, southern South China Sea  

E-Print Network [OSTI]

and Malay basins. Contraction in the Western NCS, West Natuna, and Malay basins was accommodated through reactivation of major basin-bounding fault systems that resulted in asymmetric fault-bend folding of syn- and early post-rift strata. Inversion...

Olson, Christopher Charles

2012-06-07T23:59:59.000Z

429

Full-Wave Seismic Data Assimilation: Theoretical Background and Recent Advances Abstract--The seismological inverse problem has much in  

E-Print Network [OSTI]

Full-Wave Seismic Data Assimilation: Theoretical Background and Recent Advances PO CHEN 1 Abstract for estimating seismic source and Earth structure parameters in the form of weak-con- straint generalized inverse, in which the seismic wave equation and the associated initial and boundary conditions are allowed to con

Chen, Po

430

Effects of adaptive refinement on the inverse EEG solution David M. Weinstein, Christopher R. Johnson and John A. Schmidt  

E-Print Network [OSTI]

on the surface of the scalp and the geometry and conductivity properties within the head, calculate the current and potential fields within the brain through an inverse procedure. To test these methods, we have constructed several finite element head models from magnetic resonance images (MRI) of a patient. The finite element

Utah, University of

431

PII S0016-7037(00)00772-4 Rare earth element variations resulting from inversion of pigeonite and subsolidus  

E-Print Network [OSTI]

PII S0016-7037(00)00772-4 Rare earth element variations resulting from inversion of pigeonite ion mass spectrometry study of the rare earth elements (REEs) in the minerals of two samples of lunar earth element (REE) composi- tions of the minerals in the subgroups of lunar ferroan anortho- sites

432

Three-dimensional self-potential inversion for subsurface DNAPL contaminant detection at the Savannah River Site, South Carolina  

E-Print Network [OSTI]

as an electrochemical source for the SP signals measured in this investigation. A 3-D self-potential inversion algorithm a long-term groundwater hazard. Remediation of sites contaminated with these chemicals therefore remains an important issue today. The goal of this investigation is to characterize underground contaminant

Sailhac, Pascal

433

Inversion of regional gravity gradient data over the Vredefort Impact Structure, South Africa Cericia Martinez and Yaoguo Li  

E-Print Network [OSTI]

Inversion of regional gravity gradient data over the Vredefort Impact Structure, South Africa- try data over the Vredefort Impact Structure in South Africa. With the rapidly growing field impact structure in South Africa. INTRODUCTION Gravity has long been used to study and characterize

434

Estimation of errors in the inverse modeling of accidental release of atmospheric pollutant: Application to the reconstruction  

E-Print Network [OSTI]

Estimation of errors in the inverse modeling of accidental release of atmospheric pollutant difficulty when inverting the source term of an atmospheric tracer dispersion problem is the estimation of the prior errors: those of the atmospheric transport model, those ascribed to the representativity

Paris-Sud XI, Université de

435

Joint inversion of seismic AVO and EM data for gas saturation estimation using a sampling-based stochastic model  

E-Print Network [OSTI]

hypothesis using a sampling-based stochastic model, based on a typical situation of gas explorationJoint inversion of seismic AVO and EM data for gas saturation estimation using a sampling- based stochastic model Jinsong Chen*, G. Michael Hoversten, and D. W. Vasco, Lawrence Berkeley National Laboratory

Chen, Jinsong

436

Probing sequence-structure relationships in proteins: Application of simple energy functions to the inverse folding problem  

E-Print Network [OSTI]

A brief description of the protein-folding and inverse-folding problems is provided. Design of energy are applied to estimate the sequence capacity of all known protein folds, and to compute the evolutionary for recognition of protein folds, and conclude with an application to protein evolution, studying the sequence

Elber, Ron

437

Influence of reduced carbon emissions and oxidation on the distribution of atmospheric CO2: Implications for inversion analyses  

E-Print Network [OSTI]

Influence of reduced carbon emissions and oxidation on the distribution of atmospheric CO2 carbon emissions. We used TransCom3 annual mean simulations from three transport models to evaluate carbon emission and oxidation processes in deriving inversion estimates of CO2 surface fluxes. Citation

Krakauer, Nir Y.

438

Perfluorocyclohexene Bridge in Inverse DiArylEthenes: One Step Synthesis through Pd-Catalysed C-H bond Activation, Joint Experimental and Theoretical Studies on  

E-Print Network [OSTI]

Perfluorocyclohexene Bridge in Inverse DiArylEthenes: One Step Synthesis through Pd-Catalysed C-H versus inverse (I-type)3,4 DAE (see Scheme 1). In addition, the nature of the ethene bridge can photochromic properties in which the ethene bridge is incorporated into a six-membered ring have been also

439

A multiresolution spatial parametrization for the estimation of fossil-fuel carbon dioxide emissions via atmospheric inversions.  

SciTech Connect (OSTI)

The estimation of fossil-fuel CO2 emissions (ffCO2) from limited ground-based and satellite measurements of CO2 concentrations will form a key component of the monitoring of treaties aimed at the abatement of greenhouse gas emissions. To that end, we construct a multiresolution spatial parametrization for fossil-fuel CO2 emissions (ffCO2), to be used in atmospheric inversions. Such a parametrization does not currently exist. The parametrization uses wavelets to accurately capture the multiscale, nonstationary nature of ffCO2 emissions and employs proxies of human habitation, e.g., images of lights at night and maps of built-up areas to reduce the dimensionality of the multiresolution parametrization. The parametrization is used in a synthetic data inversion to test its suitability for use in atmospheric inverse problem. This linear inverse problem is predicated on observations of ffCO2 concentrations collected at measurement towers. We adapt a convex optimization technique, commonly used in the reconstruction of compressively sensed images, to perform sparse reconstruction of the time-variant ffCO2 emission field. We also borrow concepts from compressive sensing to impose boundary conditions i.e., to limit ffCO2 emissions within an irregularly shaped region (the United States, in our case). We find that the optimization algorithm performs a data-driven sparsification of the spatial parametrization and retains only of those wavelets whose weights could be estimated from the observations. Further, our method for the imposition of boundary conditions leads to a 10computational saving over conventional means of doing so. We conclude with a discussion of the accuracy of the estimated emissions and the suitability of the spatial parametrization for use in inverse problems with a significant degree of regularization.

Ray, Jaideep; Lee, Jina; Lefantzi, Sophia; Yadav, Vineet [Carnegie Institution for Science, Stanford, CA; Michalak, Anna M. [Carnegie Institution for Science, Stanford, CA; van Bloemen Waanders, Bart Gustaaf [Sandia National Laboratories, Albuquerque, NM; McKenna, Sean Andrew [IBM Research, Mulhuddart, Dublin 15, Ireland

2013-04-01T23:59:59.000Z

440

Inverse cascade and symmetry breaking in rapidly-rotating Boussinesq convection  

E-Print Network [OSTI]

In this paper we present numerical simulations of rapidly-rotating Rayleigh-B\\'enard convection in the Boussinesq approximation with stress-free boundary conditions. At moderately low Rossby number and large Rayleigh number, we show that a large-scale depth-invariant flow is formed, reminiscent of the condensate state observed in two-dimensional flows. We show that the large-scale circulation shares many similarities with the so-called vortex, or slow-mode, of forced rotating turbulence. Our investigations show that at a fixed rotation rate the large-scale vortex is only observed for a finite range of Rayleigh numbers, as the quasi-two-dimensional nature of the flow disappears at very high Rayleigh numbers. We observe slow vortex merging events and find a non-local inverse cascade of energy in addition to the regular direct cascade associated with fast small-scale turbulent motions. Finally, we show that cyclonic structures are dominant in the small-scale turbulent flow and this symmetry breaking persists in ...

Favier, B; Proctor, M R E

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


441

IMAGING STARSPOT EVOLUTION ON KEPLER TARGET KIC 5110407 USING LIGHT-CURVE INVERSION  

SciTech Connect (OSTI)

The Kepler target KIC 5110407, a K-type star, shows strong quasi-periodic light curve fluctuations likely arising from the formation and decay of spots on the stellar surface rotating with a period of 3.4693 days. Using an established light-curve inversion algorithm, we study the evolution of the surface features based on Kepler space telescope light curves over a period of two years (with a gap of .25 years). At virtually all epochs, we detect at least one large spot group on the surface causing a 1%-10% flux modulation in the Kepler passband. By identifying and tracking spot groups over a range of inferred latitudes, we measured the surface differential rotation to be much smaller than that found for the Sun. We also searched for a correlation between the 17 stellar flares that occurred during our observations and the orientation of the dominant surface spot at the time of each flare. No statistically significant correlation was found except perhaps for the very brightest flares, suggesting that most flares are associated with regions devoid of spots or spots too small to be clearly discerned using our reconstruction technique. While we may see hints of long-term changes in the spot characteristics and flare statistics within our current data set, a longer baseline of observation will be needed to detect the existence of a magnetic cycle in KIC 5110407.

Roettenbacher, Rachael M.; Monnier, John D. [Department of Astronomy, University of Michigan, Ann Arbor, MI 48109 (United States)] [Department of Astronomy, University of Michigan, Ann Arbor, MI 48109 (United States); Harmon, Robert O. [Department of Physics and Astronomy, Ohio Wesleyan University, Delaware, OH 43015 (United States)] [Department of Physics and Astronomy, Ohio Wesleyan University, Delaware, OH 43015 (United States); Barclay, Thomas; Still, Martin, E-mail: rmroett@umich.edu [NASA Ames Research Center, Moffett Field, CA 94035 (United States)] [NASA Ames Research Center, Moffett Field, CA 94035 (United States)

2013-04-10T23:59:59.000Z

442

Inverse modeling and forecasting for the exploitation of the Pauzhetsky geothermal field, Kamchatka, Russia  

SciTech Connect (OSTI)

A three-dimensional numerical model of the Pauzhetsky geothermal field has been developed based on a conceptual hydrogeological model of the system. It extends over a 13.6-km2 area and includes three layers: (1) a base layer with inflow; (2) a geothermal reservoir; and (3) an upper layer with discharge and recharge/infiltration areas. Using the computer program iTOUGH2 (Finsterle, 2004), the model is calibrated to a total of 13,675 calibration points, combining natural-state and 1960-2006 exploitation data. The principal model parameters identified and estimated by inverse modeling include the fracture permeability and fracture porosity of the geothermal reservoir, the initial natural upflow rate, the base-layer porosity, and the permeabilities of the infiltration zones. Heat and mass balances derived from the calibrated model helped identify the sources of the geothermal reserves in the field. With the addition of five makeup wells, simulation forecasts for the 2007-2032 period predict a sustainable average steam production of 29 kg/s, which is sufficient to maintain the generation of 6.8 MWe at the Pauzhetsky power plant.

Finsterle, Stefan; Kiryukhin, A.V.; Asaulova, N.P.; Finsterle, S.

2008-04-01T23:59:59.000Z

443

Parameter estimation from flowing fluid temperature logging data in unsaturated fractured rock using multiphase inverse modeling  

SciTech Connect (OSTI)

A simple conceptual model has been recently developed for analyzing pressure and temperature data from flowing fluid temperature logging (FFTL) in unsaturated fractured rock. Using this conceptual model, we developed an analytical solution for FFTL pressure response, and a semianalytical solution for FFTL temperature response. We also proposed a method for estimating fracture permeability from FFTL temperature data. The conceptual model was based on some simplifying assumptions, particularly that a single-phase airflow model was used. In this paper, we develop a more comprehensive numerical model of multiphase flow and heat transfer associated with FFTL. Using this numerical model, we perform a number of forward simulations to determine the parameters that have the strongest influence on the pressure and temperature response from FFTL. We then use the iTOUGH2 optimization code to estimate these most sensitive parameters through inverse modeling and to quantify the uncertainties associated with these estimated parameters. We conclude that FFTL can be utilized to determine permeability, porosity, and thermal conductivity of the fracture rock. Two other parameters, which are not properties of the fractured rock, have strong influence on FFTL response. These are pressure and temperature in the borehole that were at equilibrium with the fractured rock formation at the beginning of FFTL. We illustrate how these parameters can also be estimated from FFTL data.

Mukhopadhyay, S.; Tsang, Y.; Finsterle, S.

2009-01-15T23:59:59.000Z

444

LENDA, a Low Energy Neutron Detector Array for experiments with radioactive beams in inverse kinematics  

E-Print Network [OSTI]

The Low Energy Neutron Detector Array (LENDA) is a neutron time-of-flight (TOF) spectrometer developed at the National Superconducting Cyclotron Lab- oratory (NSCL) for use in inverse kinematics experiments with rare isotope beams. Its design has been motivated by the need to study the spin-isospin response of unstable nuclei using (p, n) charge-exchange reactions at intermediate energies (> 100 MeV/u). It can be used, however, for any reaction study that involves emission of low energy neutrons (150 keV - 10 MeV). The array consists of 24 plastic scintillator bars and is capable of registering the recoiling neutron energy and angle with high detection efficiency. The neutron energy is determined by the time-of-flight technique, while the position of interaction is deduced using the timing and energy information from the two photomultipliers of each bar. A simple test setup utilizing radioactive sources has been used to characterize the array. Results of test measurements are compared with simulations. A neutron energy threshold of 20 % for neutrons below 4 MeV have been obtained.

G. Perdikakis; M. Sasano; Sam M. Austin; D. Bazin; C. Caesar; S. Cannon; J. M. Deaven; H. J. Doster; C. J. Guess; G. W. Hitt; J. Marks; R. Meharchand; D. T. Nguyen; D. Peterman; A. Prinke; M. Scott; Y. Shimbara; K. Thorne; L. Valdez; R. G. T. Zegers

2012-05-21T23:59:59.000Z

445

Modified Inverse First Order Reliability Method (I-FORM) for Predicting Extreme Sea States.  

SciTech Connect (OSTI)

Environmental contours describing extreme sea states are generated as the input for numerical or physical model simulation s as a part of the stand ard current practice for designing marine structure s to survive extreme sea states. Such environmental contours are characterized by combinations of significant wave height ( ) and energy period ( ) values calculated for a given recurrence interval using a set of data based on hindcast simulations or buoy observations over a sufficient period of record. The use of the inverse first - order reliability method (IFORM) i s standard design practice for generating environmental contours. In this paper, the traditional appli cation of the IFORM to generating environmental contours representing extreme sea states is described in detail and its merits and drawbacks are assessed. The application of additional methods for analyzing sea state data including the use of principal component analysis (PCA) to create an uncorrelated representation of the data under consideration is proposed. A reexamination of the components of the IFORM application to the problem at hand including the use of new distribution fitting techniques are shown to contribute to the development of more accurate a nd reasonable representations of extreme sea states for use in survivability analysis for marine struc tures. Keywords: In verse FORM, Principal Component Analysis , Environmental Contours, Extreme Sea State Characteri zation, Wave Energy Converters

Eckert-Gallup, Aubrey Celia; Sallaberry, Cedric Jean-Marie; Dallman, Ann Renee; Neary, Vincent Sinclair

2014-09-01T23:59:59.000Z

446

Optimization of operating conditions for steam turbine using an artificial neural network inverse  

Science Journals Connector (OSTI)

Abstract The useful life (UL) of the failure assessment in blades of steam turbines is optimized using the artificial intelligence. The objective of this paper is to develop an integrated approach using artificial neural network inverse (ANNi) coupling with a Nelder Mead optimization method to estimate the resonance stress when the UL of the blades is required. The proposed method \\{ANNi\\} is a new tool which inverts the artificial neural network (ANN). Firstly, It is necessary to build the artificial neural network (ANN) that simulates the output parameter (UL). ANN's model is constituted of feedforward network with one hidden layer to calculate the output of the process when input parameters are well known, then inverting ANN. The \\{ANNi\\} could be used as a tool to estimate the optimal unknown parameter required (resonance stress). Very low percentage of error and short computing time are precise and efficient, make this methodology (ANNi) attractive to be applied for control on line the UL of the system and constitutes a very promising framework for finding set of good solutions.

Y.El. Hamzaoui; J.A. Rodrguez; J.A. Hernndez; Victor Salazar

2015-01-01T23:59:59.000Z

447

Derivation of coarse-grained potentials via multistate iterative Boltzmann inversion  

E-Print Network [OSTI]

In this work, an extension to the standard iterative Boltzmann inversion (IBI) method to derive coarse-grained potentials is proposed. It is shown that the inclusion of target data from multiple states yields a less state-dependent potential, and is thus better suited to simulate systems over a range of thermodynamic states than the standard IBI method. The inclusion of target data from multiple states forces the algorithm to sample regions of potential phase space that match the radial distribution function at multiple state points, thus producing a derived potential that is more representative of the underlying potential interactions. It is shown that the algorithm is able to converge to the true potential for a system where the underlying potential is known. It is also shown that potentials derived via the proposed method better predict the behavior of n-alkane chains than those derived via the standard method. Additionally, through the examination of alkane monolayers, it is shown that the relative weight given to each state in the fitting procedure can impact bulk system properties, allowing the potentials to be further tuned in order to match the properties of reference atomistic and/or experimental systems.

Timothy C. Moore; Christopher R. Iacovella; Clare McCabe

2014-10-07T23:59:59.000Z

448

Rank deficiency and Tikhonov regularization in the inverse problem for gravitational-wave bursts  

E-Print Network [OSTI]

Coherent techniques for searches of gravitational-wave bursts effectively combine data from several detectors, taking into account differences in their responses. The efforts are now focused on the maximum likelihood principle as the most natural way to combine data, which can also be used without prior knowledge of the signal. Recent studies however have shown that straightforward application of the maximum likelihood method to gravitational waves with unknown waveforms can lead to inconsistencies and unphysical results such as discontinuity in the residual functional, or divergence of the variance of the estimated waveforms for some locations in the sky. So far the solutions to these problems have been based on rather different physical arguments. Following these investigations, we now find that all these inconsistencies stem from rank deficiency of the underlying network response matrix. In this paper we show that the detection of gravitational-wave bursts with a network of interferometers belongs to the category of ill-posed problems. We then apply the method of Tikhonov regularization to resolve the rank deficiency and introduce a minimal regulator which yields a well-conditioned solution to the inverse problem for all locations on the sky.

Malik Rakhmanov

2006-09-19T23:59:59.000Z

449

Transfer Matrices as Non-Unitary S-Matrices, Multimode Unidirectional Invisibility, and Perturbative Inverse Scattering  

E-Print Network [OSTI]

We show that in one dimension the transfer matrix M of any scattering potential v coincides with the S-matrix of an associated time-dependent non-Hermitian 2 x 2 matrix Hamiltonian H(\\tau). If v is real-valued, H(\\tau) is pseudo-Hermitian and its exceptional points correspond to the classical turning points of v. Applying time-dependent perturbation theory to H(\\tau) we obtain a perturbative series expansion for M and use it to study the phenomenon of unidirectional invisibility. In particular, we establish the possibility of having multimode unidirectional invisibility with wavelength-dependent direction of invisibility and construct various physically realizable optical potentials possessing this property. We also offer a simple demonstration of the fact that the off-diagonal entries of the first Born approximation for M determine the form of the potential. This gives rise to a perturbative inverse scattering scheme that is particularly suitable for optical design. As a simple application of this scheme, we construct an infinite-range unidirectionally invisible potential.

Ali Mostafazadeh

2013-11-07T23:59:59.000Z

450

Synchrotron and inverse-Compton emissions from pairs formed in GRB afterglows (analytical treatment)  

E-Print Network [OSTI]

We calculate the synchrotron and inverse-Compton emissions from pairs formed in GRB afterglows from high-energy photons (above 100 MeV), assuming a power-law photon spectrum C_nu ~ nu^{-2} and considering only the pairs generated from primary high-energy photons. The essential properties of these pairs (number, minimal energy, cooling energy, distribution with energy) and of their emission (peak flux, spectral breaks, spectral slope) are set by the observables GeV fluence Phi (t) = Ft and spectrum, and by the Lorentz factor Gamma and magnetic field B of the source of high-energy photons, at observer-time t. Optical and X-ray pseudo--light-curves F_nu (Gamma) are calculated for given B; proper synchrotron self-Compton light-curves are calculated by setting the dynamics Gamma(t) of the high-energy photons source to be that of a decelerating, relativistic shock. It is found that the emission from pairs can accommodate the flux and decays of the optical flashes measured during the prompt (GRB) phase and of the fa...

Panaitescu, A

2014-01-01T23:59:59.000Z

451

Tests of the Gravitational Inverse-Square Law below the Dark-Energy Length Scale D. J. Kapner,* T. S. Cook, E. G. Adelberger, J. H. Gundlach, B. R. Heckel, C. D. Hoyle, and H. E. Swanson  

E-Print Network [OSTI]

Tests of the Gravitational Inverse-Square Law below the Dark-Energy Length Scale D. J. Kapner,* T-balance experiments to test the gravitational inverse-square law at separations between 9.53 mm and 55 m, probing of the gravitational inverse-square law we report in this Letter. Our tests were made with a substantially upgraded ver

Washington at Seattle, University of - Department of Physics, Electroweak Interaction Research Group

452

Energy exchange between a laser beam and charged particles using inverse transition radiation and method for its use  

DOE Patents [OSTI]

A method and apparatus for exchanging energy between relativistic charged particles and laser radiation using inverse diffraction radiation or inverse transition radiation. The beam of laser light is directed onto a particle beam by means of two optical elements which have apertures or foils through which the particle beam passes. The two apertures or foils are spaced by a predetermined distance of separation and the angle of interaction between the laser beam and the particle beam is set at a specific angle. The separation and angle are a function of the wavelength of the laser light and the relativistic energy of the particle beam. In a diffraction embodiment, the interaction between the laser and particle beams is determined by the diffraction effect due to the apertures in the optical elements. In a transition embodiment, the interaction between the laser and particle beams is determined by the transition effect due to pieces of foil placed in the particle beam path.

Kimura, Wayne D. (Bellevue, WA); Romea, Richard D. (Seattle, WA); Steinhauer, Loren C. (Bothell, WA)

1998-01-01T23:59:59.000Z

453

Patient-Specific Monte Carlo-Based Dose-Kernel Approach for Inverse Planning in Afterloading Brachytherapy  

SciTech Connect (OSTI)

Purpose: Brachytherapy planning software relies on the Task Group report 43 dosimetry formalism. This formalism, based on a water approximation, neglects various heterogeneous materials present during treatment. Various studies have suggested that these heterogeneities should be taken into account to improve the treatment quality. The present study sought to demonstrate the feasibility of incorporating Monte Carlo (MC) dosimetry within an inverse planning algorithm to improve the dose conformity and increase the treatment quality. Methods and Materials: The method was based on precalculated dose kernels in full patient geometries, representing the dose distribution of a brachytherapy source at a single dwell position using MC simulations and the Geant4 toolkit. These dose kernels are used by the inverse planning by simulated annealing tool to produce a fast MC-based plan. A test was performed for an interstitial brachytherapy breast treatment using two different high-dose-rate brachytherapy sources: the microSelectron iridium-192 source and the electronic brachytherapy source Axxent operating at 50 kVp. Results: A research version of the inverse planning by simulated annealing algorithm was combined with MC to provide a method to fully account for the heterogeneities in dose optimization, using the MC method. The effect of the water approximation was found to depend on photon energy, with greater dose attenuation for the lower energies of the Axxent source compared with iridium-192. For the latter, an underdosage of 5.1% for the dose received by 90% of the clinical target volume was found. Conclusion: A new method to optimize afterloading brachytherapy plans that uses MC dosimetric information was developed. Including computed tomography-based information in MC dosimetry in the inverse planning process was shown to take into account the full range of scatter and heterogeneity conditions. This led to significant dose differences compared with the Task Group report 43 approach for the Axxent source.

D'Amours, Michel [Departement de Radio-Oncologie et Centre de Recherche en Cancerologie de l'Universite Laval, Hotel-Dieu de Quebec, Quebec, QC (Canada); Department of Physics, Physics Engineering, and Optics, Universite Laval, Quebec, QC (Canada); Pouliot, Jean [Department of Radiation Oncology, University of California, San Francisco, School of Medicine, San Francisco, CA (United States); Dagnault, Anne [Departement de Radio-Oncologie et Centre de Recherche en Cancerologie de l'Universite Laval, Hotel-Dieu de Quebec, Quebec, QC (Canada); Verhaegen, Frank [Department of Radiation Oncology, Maastro Clinic, GROW Research Institute, Maastricht University Medical Centre, Maastricht (Netherlands); Department of Oncology, McGill University, Montreal, QC (Canada); Beaulieu, Luc, E-mail: beaulieu@phy.ulaval.ca [Departement de Radio-Oncologie et Centre de Recherche en Cancerologie de l'Universite Laval, Hotel-Dieu de Quebec, Quebec, QC (Canada); Department of Physics, Physics Engineering, and Optics, Universite Laval, Quebec, QC (Canada)

2011-12-01T23:59:59.000Z

454

Changes in stationary upright standing and proprioceptive reflex control of foot muscles after fatiguing static foot inversion  

Science Journals Connector (OSTI)

Abstract We searched for the consequences of a maximal static foot inversion sustained until exhaustion on the post-exercise stationary upright standing and the proprioceptive control of the foot muscles. Twelve healthy subjects executed an unilateral maximal static foot inversion during which continuous power spectrum analyses of surface electromyograms of the tibialis anterior (TA), peroneus longus (PL), and gastrocnemius medialis (GM) muscles were performed. Superimposed pulse trains (twitch interpolation) were delivered to the TA muscle to identify central or peripheral fatigue. Before and after the fatiguing task, we measured (1) the repartition of the plantar and barycentre surfaces with a computerized stationary platform, (2) the peak contractile TA response to electrical stimulation (TA twitch), (3) the tonic vibratory response (TVR) of TA and GM muscles, and (4) the Hoffman reflex. During static exercise, central fatigue was diagnosed in 5/12 subjects whereas in the 7 others peripheral TA fatigue was deduced from the absence of response to twitch interpolation and the post-exercise decrease in twitch amplitude. The sustained foot inversion was associated with reduced median frequency in TA but not in PL and GM muscles. After static exercise, in all subjects both the mean plantar and rearfoot surfaces increased, indicating a foot eversion, the TVR amplitude decreased in TA but did not vary in GM, and the Hoffman reflex remained unchanged. Whatever was the mechanism of fatigue during the maximal foot inversion task, the facilitating myotatic reflex was constantly altered in foot invertor muscles. This could explain the prevailing action of the antagonistic evertor muscles.

Bruno Vie; Nicolas Gomez; Christelle Brerro-Saby; Jean Paul Weber; Yves Jammes

2013-01-01T23:59:59.000Z

455

Inverse Square Law of Gravitation in (2+1)-Dimensional Space-Time as a Consequence of Casimir Energy  

E-Print Network [OSTI]

The gravitational effect of vacuum polarization in space exterior to a particle in (2+1)-dimensional Einstein theory is investigated. In the weak field limit this gravitational field corresponds to an inverse square law of gravitational attraction, even though the gravitational mass of the quantum vacuum is negative. The paradox is resolved by considering a particle of finite extension and taking into account the vacuum polarization in its interior.

H. H. Soleng

1993-10-04T23:59:59.000Z

456

On the electrical resistivity of Pt3FexMn1-x alloys in the exchange inversion region  

E-Print Network [OSTI]

L-781 On the electrical resistivity of Pt3FexMn1-x alloys in the exchange inversion region J. V The electrical resistivity (p) data as a function of temperature are reported for Pt3FexMn1-x alloys (with x = 0. The samples for electrical resistivity ( ~ 1 x 1 x 8 mm3) were cut and reannealed for 72 hours before being

Boyer, Edmond

457

Energy flux pattern of inverse Goos-Hanchen shift in photonic crystals with negative index of refraction  

E-Print Network [OSTI]

The energy flux patterns of inverse Goos-Hanchen (GH) shift around the interface between air and negatively refractive photonic crystal (NRPhC) with different surface terminations is investigated. Results show that NRPhC exhibits inverse GH shift in TM and TE polarization, and the localization and pattern of energy flux differ in TM and TE polarizations and are strongly affected by surface termination. This is different to the condition of negative permittivity materials (i.e., metal), which only presents inverse GH shift in TM polarization. In the case of TE polarization, the energy flux pattern exhibits the flux of backward wave whose localization changes from the surface to inside of NRPhC with the variation of surface termination. In the case of TM polarization, the energy flux pattern is always confined within the surface of NRPhC, whereas its pattern changes from the flux of backward wave to vortices at the surface of NRPhC, which is different to the energy flux of TM polarization of metal. By properly ...

Hu, Jinbing; Chen, Jiabi; Jiang, Qiang; Wang, Yan; Zhuang, Songlin

2015-01-01T23:59:59.000Z

458

Development of a High Solid-Angle Silicon Detector Array for Measurement of Transfer Reactions in Inverse Kinematics  

SciTech Connect (OSTI)

The development of high quality radioactive beams, such as those at the HRIBF at Oak Ridge National Laboratory, has made possible the measurement of transfer reactions in inverse kinematics on unstable nuclei. Measurement of (d,p) reactions on neutron-rich nuclei yield data on the evolution of nuclear structure away from stability, and are of astrophysical interest due to the proximity of suggested nuclear burning paths in the astrophysical r-process in supernovae. Experimentally, (d,p) reactions on heavy (Z = 50) fission fragments are complicated by the strongly inverse kinematics, and the relatively low beam intensities. Consequently, ejectile detection with high resolution in position and energy, a high dynamic range and a high solid angular coverage is required. The Oak Ridge Rutgers University Barrel Array (ORRUBA) is a new silicon detector array currently under construction, optimized for the measurement of (d,p) reactions in inverse kinematics. It consists of two rings of silicon detectors, providing a high solid angular coverage for angles symmetrically forward and backward of 90 degrees. Resistive strip detectors are used to obtain high precision position and energy measurement of reaction ejectiles.

Pain, S. D. [Rutgers University; Cizewski, J. A. [Rutgers University; Hatarik, Robert [Rutgers University; Jones, K. L. [University of Tennessee, Knoxville (UTK); Thomas, J. S. [Rutgers University; Bardayan, Daniel W [ORNL; Blackmon, Jeff C [ORNL; Nesaraja, Caroline D [ORNL; Smith, Michael Scott [ORNL; Kozub, R. L. [Tennessee Technological University; Johnson, Micah [ORNL

2007-01-01T23:59:59.000Z

459

Galileo Photopolarimeter-Radiometer Observations of Jupiter and the Galilean Satellites  

Science Journals Connector (OSTI)

...assuming average atmospheric radiances and aver-ages...September 1996 Galileo Plasma Wave Observations...flyby of lo. The plasma wave subsystem...measure the spectrum of plasma waves and radio emissions...from 5 Hz to 5.6 MHz (1). During the...fre-quency (-20 to 60 kHz), uniquely identi-fies...

G. S. Orton; J. R. Spencer; L. D. Travis; T. Z. Martin; L. K. Tamppari

1996-10-18T23:59:59.000Z

460

Acceleration of electrons using an inverse free electron laser auto- accelerator  

SciTech Connect (OSTI)

We present data from our study of a device known as the inverse free electron laser. First, numerical simulations were performed to optimize the design parameters for an experiment that accelerates electrons in the presence of an undulator by stimulated absorption of radiation. The Columbia free electron laser (FEL) was configured as an auto-accelerator (IFELA) system; high power (MW's) FEL radiation at {approximately}1.65 mm is developed along the first section of an undulator inside a quasi-optical resonator. The electron beam then traverses a second section of undulator where a fraction of the electrons is accelerated by stimulated absorption of the 1.65 mm wavelength power developed in the first undulator section. The second undulator section has very low gain and does not generate power on its own. We have found that as much as 60% of the power generated in the first section can be absorbed in the second section, providing that the initial electron energy is chosen correctly with respect to the parameters chosen for the first and second undulators. An electron momentum spectrometer is used to monitor the distribution of electron energies as the electrons exit the IFELA. We have found; using our experimental parameters, that roughly 10% of the electrons are accelerated to energies as high as 1100 keV, in accordance with predictions from the numerical model. The appearance of high energy electrons is correlated with the abrupt absorption of millimeter power. The autoaccelerator configuration is used because there is no intense source of coherent power at the 1.65 mm design wavelength other than the FEL.

Wernick, I.K.; Marshall, T.C.

1992-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiance inversions subsystem" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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461

Acceleration of electrons using an inverse free electron laser auto- accelerator  

SciTech Connect (OSTI)

We present data from our study of a device known as the inverse free electron laser. First, numerical simulations were performed to optimize the design parameters for an experiment that accelerates electrons in the presence of an undulator by stimulated absorption of radiation. The Columbia free electron laser (FEL) was configured as an auto-accelerator (IFELA) system; high power (MW`s) FEL radiation at {approximately}1.65 mm is developed along the first section of an undulator inside a quasi-optical resonator. The electron beam then traverses a second section of undulator where a fraction of the electrons is accelerated by stimulated absorption of the 1.65 mm wavelength power developed in the first undulator section. The second undulator section has very low gain and does not generate power on its own. We have found that as much as 60% of the power generated in the first section can be absorbed in the second section, providing that the initial electron energy is chosen correctly with respect to the parameters chosen for the first and second undulators. An electron momentum spectrometer is used to monitor the distribution of electron energies as the electrons exit the IFELA. We have found; using our experimental parameters, that roughly 10% of the electrons are accelerated to energies as high as 1100 keV, in accordance with predictions from the numerical model. The appearance of high energy electrons is correlated with the abrupt absorption of millimeter power. The autoaccelerator configuration is used because there is no intense source of coherent power at the 1.65 mm design wavelength other than the FEL.

Wernick, I.K.; Marshall, T.C.

1992-07-01T23:59:59.000Z

462

Inverse bremsstrahlung heating rate in xenon clusters in the eikonal approximation  

SciTech Connect (OSTI)

We report inverse bremsstrahlung (IB) heating rates in the eikonal approximation (EA). The present analysis is performed using the plasma-screened Rogers and Debye potentials for Xe clusters with two different charge states (6 and 10). We compare the eikonal results with the first Born approximation (FBA) and classical-simulation (CL-sim) (Moll et al., Phys. Plasmas 19, 033303 (2012)) calculations for clusters in infrared light. Calculations have been performed for the field strength of 2.6 Multiplication-Sign 10{sup 8} V/cm. We find that compared to the FBA and CL-sim methods, the IB heating rate in the EA is less sensitive to the choice of the two potentials considered here. The present EA calculation shows that the influence of the inner structure of atomic ion on the heating rate is more prominent for the smaller ion charge (Xe{sup 6+}). In the case of low laser field approximation based on the elastic transport cross sections, it is seen that in contrast to the FBA and classical methods, the heating rate predicted by the EA does not deviate much all over the range of mean kinetic energy of electrons (20-500 eV) considered here for both the charge states of xenon (Xe{sup 6+} and Xe{sup 10+}). Furthermore, for the Rogers potential, EA is found to be in closer agreement with the classical method than the FBA. We also compare the results of the IB heating rate using the present and low-field approximation approaches to the above three methods and observe that the magnitudes of the IB heating rate calculated in the low field approximation are, in general, higher than the corresponding values predicted by the present approach for both the electron-ion potentials.

Dey, R. [Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching (Germany); Roy, A. C. [School of Mathematical Sciences, Ramakrishna Mission Vivekananda University, Belur Math, 711202 West Bengal (India)

2013-03-15T23:59:59.000Z

463

Inversion of reservoir quality: An example from the Triassic Buntsandstein, offshore Netherlands  

SciTech Connect (OSTI)

Sandstones from the Triassic Main Buntsandstein form a major gas reservoir in the Netherlands offshore. The sequence is dominated by siliciclastics deposited in an arid continental setting, and include dune, interdune, sheetsand, and fluvial sandstones. Reduction in reservoir quality is caused primarily by dolomite, halite, and anhydrite cementation, with minor authigenic illite and chlorite. Integration of petrographic and isotopic data has allowed the origins and relative timing of the different cements to be constrained. The carbon and oxygen isotopic composition of dolomite ([delta][sup 13]C = -3.76 to -9.3%, [delta][sup 18]O = -3 to +2.9% PDB) combined with strontium isotopic data (0.7091 to 0.7109 [sup 86]Sr/[sup 87]Sr) suggest that is precipitated from meteoric groundwater. Halite and anhydrite formed from a mixture of meteoric water and saline fluids expelled from underlying evaporites and claystones. Sulfur isotopic data (+4.2 to +12.1 CDT) support6 this interpretation for the origin of the anhydrite. Precipitation of the major authigenic minerals occurred during early diagenesis, prior to burial depths of 500 m. Cementation and groundwater flow followed the zones of highest permeability and caused an inversion of reservoir quality. Sandstones with the highest depositional porosity and permeability (i.e., dune sandstones) are the most cemented, and have poorer reservoir quality compared to the fluvial and interdune sandstones, which originally had lower depositional porosity/permeability. Formation of authigenic illite and chlorite occurred during burial and has significantly reduced permeability. Information on the depositional settings and paleogeography, combined with expected groundwater flow, has helped define potential exploration areas of reduced reservoir quality as a result of extensive early cementation.

Purvis, K.; Okkerman, J. (Koninklijke/Shell Exploratie en Producktie Laboratorium, Rijswijk (Netherlands))

1993-09-01T23:59:59.000Z

464

TransCom N[subscript 2]O model inter-comparison Part 2: Atmospheric inversion estimates of N[subscript 2]O emissions  

E-Print Network [OSTI]

This study examines N[subscript 2]O emission estimates from five different atmospheric inversion frameworks based on chemistry transport models (CTMs). The five frameworks differ in the choice of CTM, meteorological data, ...

Thompson, R. L.

465

Selective Fusion, Solvent Dissolution, and Local Symmetry Effects in Inversion of Colloidal Crystals to Ordered Porous Films  

Science Journals Connector (OSTI)

Selective Fusion, Solvent Dissolution, and Local Symmetry Effects in Inversion of Colloidal Crystals to Ordered Porous Films ... (15) The weight ratio of styrene to methacrylic acid was 9:1; the Z-average mean diameter of the colloidal spheres in solution was 290 nm, as measured with dynamic laser light scattering (Zetasizer 3000 HS of Malvern Instruments Ltd. with a 633 nm light source and a detector angle of 90). ... After carbonization and HF extn. of silica, the resulting carbon monoliths maintained the open, interconnected macropore structure of the preform and the mesoporosity of the skeleton, which provided a high surface area >1200 m2/g to the material. ...

Ting Zhang; Jun Qian; Xinlin Tuo; Jun Yuan

2009-12-08T23:59:59.000Z

466

2D Schrdinger Equation with Singular Even-Power and Inverse-Power Potentials in Non Commutative Complex space  

E-Print Network [OSTI]

We obtain exact solutions of the 2D Schr\\"odinger equation with the Singular Even-Power and Inverse-Power Potentials in non-commutative complex space, using the Power-series expansion method. Hence we can say that the Schr\\"odinger equation in non-commutative complex space describes to the particles with spin (1/2)in an external uniform magnitic field. Where the noncommutativity play the role of magnetic field with created the total magnetic moment of particle with spin 1/2, who in turn shifted the spectrum of energy. Such effects are similar to the Zeeman splitting in a commutative space.

Slimane Zaim; Abdelkader Bahache

2014-09-19T23:59:59.000Z

467

Dark matter vs. modifications of the gravitational inverse-square law. Results from planetary motion in the solar system  

E-Print Network [OSTI]

Dark matter or modifications of the Newtonian inverse-square law in the solar-system are studied with accurate planetary astrometric data. From extra-perihelion precession and possible changes in the third Kepler's law, we get an upper limit on the local dark matter density, rho_{DM} gravitational acceleration are really small. We examined the MOND interpolating function mu in the regime of strong gravity. Gradually varying mu suggested by fits of rotation curves are excluded, whereas the standard form mu(x)= x/(1+x^2)^{1/2} is still compatible with data. In combination with constraints from galactic rotation curves and theoretical considerations on the external field effect, the absence of any significant deviation from inverse square attraction in the solar system makes the range of acceptable interpolating functions significantly narrow. Future radio ranging observations of outer planets with an accuracy of few tenths of a meter could either give positive evidence of dark matter or disprove modifications of gravity.

M. Sereno; Ph. Jetzer

2006-06-08T23:59:59.000Z

468

Initial Report on the Development of a Monte Carlo-Markov Chain Joint Inversion Approach for Geothermal Exploration  

SciTech Connect (OSTI)

Geothermal exploration and subsequent characterization of potential resources typically employ a variety of geophysical, geologic and geochemical techniques. However, since the data collected by each technique provide information directly on only one or a very limited set of the many physical parameters that characterize a geothermal system, no single method can be used to describe the system in its entirety. Presently, the usual approach to analyzing disparate data streams for geothermal applications is to invert (or forward model) each data set separately and then combine or compare the resulting models, for the most part in a more or less ad hoc manner. However, while each inversion may yield a model that fits the individual data set, the models are usually inconsistent with each other to some degree. This reflects uncertainties arising from the inevitable fact that geophysical and other exploration data in general are to some extent noisy, incomplete, and of limited sensitivity and resolution, and so yield non-unique results. The purpose of the project described here is to integrate the different model constraints provided by disparate geophysical, geological and geochemical data in a rigorous and consistent manner by formal joint inversion. The objective is to improve the fidelity of exploration results and reservoir characterization, thus addressing the goal of the DOE Geothermal Program to improve success in exploration for economically viable resources by better defining drilling targets, reducing risk, and improving exploration/drilling success rates.

Foxall, W; Ramirez, A; Carlson, S; Dyer, K; Sun, Y

2007-04-25T23:59:59.000Z

469

Critical Endpoint and Inverse Magnetic Catalysis for Finite Temperature and Density Quark Matter in a Magnetic Background  

E-Print Network [OSTI]

In this article we study chiral symmetry breaking for quark matter in a magnetic background, $\\bm B$, at finite temperature and quark chemical potential, $\\mu$, making use of the Ginzburg-Landau effective action formalism. As a microscopic model to compute the effective action we use the renormalized quark-meson model. Our main goal is to study the evolution of the critical endpoint, ${\\cal CP}$, as a function of the magnetic field strength, and investigate on the realization of inverse magnetic catalysis at finite chemical potential. We find that the phase transition at zero chemical potential is always of the second order; for small and intermediate values of $\\bm B$, ${\\cal CP}$ moves towards small $\\mu$, while for larger $\\bm B$ it moves towards moderately larger values of $\\mu$. Our results are in agreement with the inverse magnetic catalysis scenario at finite chemical potential and not too large values of the magnetic field, while at larger $\\bm B$ direct magnetic catalysis sets in.

M. Ruggieri; L. Oliva; P. Castorina; R. Gatto; V. Greco

2014-02-04T23:59:59.000Z

470

Transient Inverse Calibration of Site-Wide Groundwater Model to Hanford Operational Impacts from 1943 to 1996--Alternative Conceptual Model Considering Interaction with Uppermost Basalt Confined Aquifer  

SciTech Connect (OSTI)

The baseline three-dimensional transient inverse model for the estimation of site-wide scale flow parameters, including their uncertainties, using data on the transient behavior of the unconfined aquifer system over the entire historical period of Hanford operations, has been modified to account for the effects of basalt intercommunication between the Hanford unconfined aquifer and the underlying upper basalt confined aquifer. Both the baseline and alternative conceptual models (ACM-1) considered only the groundwater flow component and corresponding observational data in the 3-Dl transient inverse calibration efforts. Subsequent efforts will examine both groundwater flow and transport. Comparisons of goodness of fit measures and parameter estimation results for the ACM-1 transient inverse calibrated model with those from previous site-wide groundwater modeling efforts illustrate that the new 3-D transient inverse model approach will strengthen the technical defensibility of the final model(s) and provide the ability to incorporate uncertainty in predictions related to both conceptual model and parameter uncertainty. These results, however, indicate that additional improvements are required to the conceptual model framework. An investigation was initiated at the end of this basalt inverse modeling effort to determine whether facies-based zonation would improve specific yield parameter estimation results (ACM-2). A description of the justification and methodology to develop this zonation is discussed.

Vermeul, Vincent R.; Cole, Charles R.; Bergeron, Marcel P.; Thorne, Paul D.; Wurstner, Signe K.

2001-08-29T23:59:59.000Z

471

Investigation on edge fringing effect and oxide thickness dependence of inversion current in metal-oxide-semiconductor tunneling diodes with comb-shaped electrodes  

SciTech Connect (OSTI)

A particular edge-dependent inversion current behavior of metal-oxide-semiconductor (MOS) tunneling diodes was investigated utilizing square and comb-shaped electrodes. The inversion tunneling current exhibits the strong dependence on the tooth size of comb-shaped electrodes and oxide thickness. Detailed illustrations of current conduction mechanism are developed by simulation and experimental measurement results. It is found that the electron diffusion current and Schottky barrier height lowering for hole tunneling current both contribute on inversion current conduction. In MOS tunneling photodiode applications, the photoresponse can be improved by decreasing SiO{sub 2} thickness and using comb-shaped electrodes with smaller tooth spacing. Meantime, the high and steady photosensitivity can also be approached by introducing HfO{sub 2} into dielectric stacks.

Lin, Chien-Chih; Hsu, Pei-Lun; Lin, Li; Hwu, Jenn-Gwo, E-mail: jghwu@ntu.edu.tw [Graduate Institute of Electronics Engineering, Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan (China)

2014-03-28T23:59:59.000Z

472

Regularization strategy for the layered inversion of airborne TEM data: application to VTEM data acquired over the basin of Franceville (Gabon)  

E-Print Network [OSTI]

Airborne transient electromagnetic (TEM) is a cost-effective method to image the distribution of electrical conductivity in the ground. We consider layered earth inversion to interpret large data sets of hundreds of kilometre. Different strategies can be used to solve this inverse problem. This consists in managing the a priori information to avoid the mathematical instability and provide the most plausible model of conductivity in depth. In order to obtain fast and realistic inversion program, we tested three kinds of regularization: two are based on standard Tikhonov procedure which consist in minimizing not only the data misfit function but a balanced optimization function with additional terms constraining the lateral and the vertical smoothness of the conductivity; another kind of regularization is based on reducing the condition number of the kernel by changing the layout of layers before minimizing the data misfit function. Finally, in order to get a more realistic distribution of conductivity, notably...

Guillemoteau, Julien; Behaegel, Mickael; 10.1111/j.1365-2478.2011.00990.x

2012-01-01T23:59:59.000Z

473

Study on inverse spinel zinc stannate, Zn2SnO4, as transparent conductive films deposited by rf magnetron sputtering  

Science Journals Connector (OSTI)

Inverse spinel zinc stannate (Zn2SnO4, ZTO) films were deposited onto fused quartz glass substrates heated at 800C by rf magnetron sputtering using a ceramic ZTO target (Zn:Sn=2:1). H2 flow ratios [H2/(Ar+H2)] were controlled from 0 to 30% during the depositions. ZTO films deposited at 800C possessed a polycrystalline inverse spinel structure. The lowest resistivity of 1.1נ10?2? cm was obtained for a ZTO film deposited at 20% H2 flow ratio. The transmittance of the ZTO film was approximately 80% in the visible region.

Yasushi Sato; Jun Kiyohara; Akira Hasegawa; Takeshi Hattori; Masaya Ishida; Noriaki Hamada; Nobuto Oka; Yuzo Shigesato

2009-01-01T23:59:59.000Z

474

Cryogenic growth of Al nitride on GaAs(110): X-ray-photoemission spectroscopy and inverse-photoemission spectroscopy  

Science Journals Connector (OSTI)

We report on our recent studies of Al nitride growth on GaAs(110) formed by depositing Al onto a condensed ammonia overlayer on GaAs(110) at T=90 K using x-ray-photoemission spectroscopy and inverse-photoemission spectroscopy. We have also investigated the temperature dependence of the interface thus formed. The results show some limited amount of Al nitride formed at T=90 K even though the reaction is slow, but the overlayer mostly remains metallic until the substrate is heated up. Much of the reaction of Al with ammonia occurs at about T=170 K, above which the overlayer becomes insulating. The combined information from occupied and unoccupied states reveals new features of the interface formation, and is consistent with our previous synchrotron photoemission studies of Al/NH3/GaAs(100).

Ken T. Park and Y. Gao

1993-02-15T23:59:59.000Z

475

Inverse magnetic catalysis in the (2+1)-flavor Nambu--Jona-Lasinio and Polyakov--Nambu--Jona-Lasinio models  

E-Print Network [OSTI]

The QCD phase diagram at zero chemical potential and finite temperature subject to an external magnetic field is studied within the three flavor Nambu--Jona-Lasinio (NJL) model and the NJL model with the Polyakov loop (PNJL). A scalar coupling parameter dependent on the magnetic field intensity is considered. The scalar coupling has been fitted so that the lattice QCD pseudocritical chiral transition temperatures are reproduced and in the limit of large magnetic field decreases with the inverse of the magnetic field intensity. This dependence of the coupling allows to reproduce the lattice QCD results with respect to the quark condensates and Polyakov loop: due to the magnetic field the quark condensates are enhanced at low and high temperatures and suppressed for temperatures close to the transition temperatures and the Polyakov loop increases with the magnetic field.

M. Ferreira; P. Costa; O. Loureno; T. Frederico; C. Providncia

2014-04-22T23:59:59.000Z

476

Permanent prostate implant using high activity seeds and inverse planning with fast simulated annealing algorithm: A 12-year Canadian experience  

SciTech Connect (OSTI)

Purpose: To report outcomes and toxicity of the first Canadian permanent prostate implant program. Methods and Materials: 396 consecutive patients (Gleason {<=}6, initial prostate specific antigen (PSA) {<=}10 and stage T1-T2a disease) were implanted between June 1994 and December 2001. The median follow-up is of 60 months (maximum, 136 months). All patients were planned with fast-simulated annealing inverse planning algorithm with high activity seeds ([gt] 0.76 U). Acute and late toxicity is reported for the first 213 patients using a modified RTOG toxicity scale. The Kaplan-Meier biochemical failure-free survival (bFFS) is reported according to the ASTRO and Houston definitions. Results: The bFFS at 60 months was of 88.5% (90.5%) according to the ASTRO (Houston) definition and, of 91.4% (94.6%) in the low risk group (initial PSA {<=}10 and Gleason {<=}6 and Stage {<=}T2a). Risk factors statistically associated with bFFS were: initial PSA >10, a Gleason score of 7-8, and stage T2b-T3. The mean D90 was of 151 {+-} 36.1 Gy. The mean V100 was of 85.4 {+-} 8.5% with a mean V150 of 60.1 {+-} 12.3%. Overall, the implants were well tolerated. In the first 6 months, 31.5% of the patients were free of genitourinary symptoms (GUs), 12.7% had Grade 3 GUs; 91.6% were free of gastrointestinal symptoms (GIs). After 6 months, 54.0% were GUs free, 1.4% had Grade 3 GUs; 95.8% were GIs free. Conclusion: The inverse planning with fast simulated annealing and high activity seeds gives a 5-year bFFS, which is comparable with the best published series with a low toxicity profile.

Martin, Andre-Guy [Departement de Radio-oncologie, Centre de Recherche en Cancerologie de l'Universite Laval, Quebec (Canada); Roy, Jean [Departement de Radio-oncologie, Centre de Recherche en Cancerologie de l'Universite Laval, Quebec (Canada); Beaulieu, Luc [Departement de Radio-oncologie, Centre de Recherche en Cancerologie de l'Universite Laval, Quebec (Canada); Centre de Recherche de l'Hotel-Dieu de Quebec, L'Hotel-Dieu de Quebec, Centre Hospitalier Universitaire de Quebec (CHUQ), Centre de Recherche en Cancerologie de l'Universite Laval, Quebec (Canada); Pouliot, Jean [Radiation Oncology, University of California San Francisco, San Francisco, CA (United States); Harel, Francois [Centre de Recherche de l'Hotel-Dieu de Quebec, L'Hotel-Dieu de Quebec, Centre Hospitalier Universitaire de Quebec (CHUQ), Centre de Recherche en Cancerologie de l'Universite Laval, Quebec (Canada); Vigneault, Eric [Departement de Radio-oncologie, Centre de Recherche en Cancerologie de l'Universite Laval, Quebec (Canada)]. E-mail: Eric.Vigneault@chuq.qc.ca

2007-02-01T23:59:59.000Z

477

Low abundances of heavy elements in the solar outer layers: comparisons of solar models with helioseismic inversions  

E-Print Network [OSTI]

Recent solar photospheric abundance analyses have led to a significant reduction of the metal abundances compared to the previous determinations. The solar models computed with standard opacities and diffusion processes using these new abundances give poor agreement with helioseismic inversions for the sound-speed profile, the surface helium abundance, and the convective zone depth. We attempt to obtain a good agreement between helioseismic inversions and solar models which present the "old" mixture in the interior and new chemical composition in the convective zone. To reach this result, we assume an undermetallic accretion at the beginning of the main sequence. We compute solar models with the Toulouse-Geneva Evolution Code, in which we simulate an undermetallic accretion in the early stages of the main sequence, in order to obtain new mixture in the outer convective zone. We compare the sound-speed profile, the convective zone depth, and the surface helium abundance with those deduced from helioseismology. The model with accretion but without any mixing process inside is in better agreement with helioseismology than the solar model with the new abundances throughout. There is, however, a spike under the convective zone which reaches 3.4%. Furthermore, the convective zone depth and the surface helium abundance are too low. Introducing undershooting below the convective zone allows us to recover the good convective zone radius and the addition of rotation-induced mixing and tachocline allows us to reconcile the surface helium abundance. But in any case the agreement of the sound-speed profile with helioseismic inference is worse than obtained with the old abundances.

M. Castro; S. Vauclair; O. Richard

2006-11-20T23:59:59.000Z

478

Application of magnetic amplitude inversion in exploration for natural gas in volcanics Yaoguo Li, Center for Gravity, Electrical, and Magnetic Studies, Colorado School of Mines  

E-Print Network [OSTI]

Application of magnetic amplitude inversion in exploration for natural gas in volcanics Yaoguo Li basins and have strong remanent magnetization. The appli- cation arises in exploration of natural gas identify the volcanic units at large depths. INTRODUCTION Exploration for natural gas hosted in volcanics

479

Combined simulation and inversion of SP and resistivity logs for the estimation of connate-water resistivity and Archie's cementation exponent  

E-Print Network [OSTI]

Combined simulation and inversion of SP and resistivity logs for the estimation of connate and water injection/steam flooding has been applied to enhance production. Fluid samples tak- en by fluid developed using a resistor net- work Segesman, 1962 , where dipole layers were simulated using voltage

Torres-Verdín, Carlos

480

Stationary IPA Estimates for NonSmooth G/G/1/1 Functionals via Palm Inversion and LevelCrossing Analysis. \\Lambda  

E-Print Network [OSTI]

Stationary IPA Estimates for Non­Smooth G/G/1/1 Functionals via Palm Inversion and Level Infinitesimal Perturbation Analysis (IPA), a method first introduced by Ho and Cao [13] and further developed and Cao [14] summarize and review most previous results on IPA. Alternative methods have been used

Lasgouttes, Jean-Marc

Note: This page contains sample records for the topic "radiance inversions subsystem" 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

Inverse Design: Playing "Jeopardy" in Materials Science (A "Life at the Frontiers of Energy Research" contest entry from the 2011 Energy Frontier Research Centers (EFRCs) Summit and Forum)  

ScienceCinema (OSTI)

'Inverse Design: Playing 'Jeopardy' in Materials Science' was submitted by the Center for Inverse Design (CID) to the 'Life at the Frontiers of Energy Research' video contest at the 2011 Science for Our Nation's Energy Future: Energy Frontier Research Centers (EFRCs) Summit and Forum. Twenty-six EFRCs created short videos to highlight their mission and their work. CID, an EFRC directed by Bill Tumas at the National Renewable Energy Laboratory is a partnership of scientists from five institutions: NREL (lead), Northwestern University, University of Colorado, Stanford University, and Oregon State University. The Office of Basic Energy Sciences in the U.S. Department of Energy's Office of Science established the 46 Energy Frontier Research Centers (EFRCs) in 2009. These collaboratively-organized centers conduct fundamental research focused on 'grand challenges' and use-inspired 'basic research needs' recently identified in major strategic planning efforts by the scientific community. The overall purpose is to accelerate scientific progress toward meeting the nation's critical energy challenges. The mission of the Center for Inverse Design is 'to replace trial-and-error methods used in the development of materials for solar energy conversion with an inverse design approach powered by theory and computation.' Research topics are: solar photovoltaic, photonic, metamaterial, defects, spin dynamics, matter by design, novel materials synthesis, and defect tolerant materials.

Alex Zunger (former Director, Center for Inverse Design); Tumas, Bill (Director, Center for Inverse Design); CID Staff

2011-11-02T23:59:59.000Z

482

Application of the 2 principle and unbiased predictive risk estimator for determining the regularization parameter in 3-D focusing gravity inversion  

Science Journals Connector (OSTI)

......rhomax] are imposed. During the inversion process if a given density value falls outside...which further complicates the solution process. First, an approach for determining...Abstracts. 251-254. 69th Ann. Internat. Mtg. Mead J.L. , Renaut R.A. A Newton......

Saeed Vatankhah; Vahid E. Ardestani; Rosemary A. Renaut

2015-01-01T23:59:59.000Z

483

A theoretical study of the gas-phase ion pair SN2 reactions of lithium halide and methyl halide with inversion and retention mechanisms  

Science Journals Connector (OSTI)

Identity and non-identity ion pair SN2 reactions, LiX+CH3X, LiY+CH3X (Y, X=F, Cl, Br and I) were investigated using CCSD(T) calculations. Two possible reaction mechanisms, inversion and retention, were discussed. Introduction of lithium cation will significantly raise the inversion barriers and may lower the retention barriers. The analysis of barrier gaps between the two channels indicates that the retention mechanism is favorable for all of the reactions involving fluorine, in contrast to the anionic SN2 reactions at carbon where inversion reaction pathway is much more favorable for all halogens. The stabilization energies for dipoledipole complexes CH3X?LiY (Y=FI) are found to have a good correlation with the electronegativity of X. The CCSD(T) central barriers and overall barriers show good agreement with the predictions of Marcus equation and its modification, respectively. Further interesting feature of the non-identity ion pair SN2 reactions is a good correlation between inversion central barriers and the composite geometric looseness (%L).

Yan Xiong; Hua-jie Zhu; Yi Ren

2003-01-01T23:59:59.000Z

484

Stochastic inversion of 2D magnetotelluric data using sharp boundary parameterization Jinsong Chen*, Lawrence Berkeley National Laboratory, Michael G. Hoversten, Chevron Energy  

E-Print Network [OSTI]

in computing power, especially parallel computing techniques, and the recent development of new numerical Institution of Oceanography, and Gregg Nordquist, Chevron Geothermal and Power Operations Summary Stochastic approaches for inverting geophysical data have many advantages over deterministic inversion methods in terms

Chen, Jinsong

485

Co-simulation of algebraically coupled dynamic subsystems  

E-Print Network [OSTI]

In the manufacturing industry out-sourcing/integration is becoming an important business pattern (not a clear statement-integration still done in house-component design and manufacturing outsourced). An engineering system ...

Gu, Bei, 1970-

2001-01-01T23:59:59.000Z

486

FAILURE DATA ANALYSIS OF THE SUPERHILAC RADIO FREQUENCY SUBSYSTEM  

E-Print Network [OSTI]

Operations Research Center (ORC) for their assistance andto Eduardo Ruiz-Esparza o' ORC for his excellent programmingthe SuperHILAC Accelerator," ORC 77-11, Operations Research

Chang, Mark K.

2012-01-01T23:59:59.000Z

487

Air Management Subsystems JohnJohn GarbakGarbak  

E-Print Network [OSTI]

with fuel cell and fuel processor · Reduce cost Fuel Cell Power System $45/kW Air Management (50-kW System · Turbocompressor for PEM Fuel Cells · Hybrid Compressor/Expander Module · Motor Blower Technology for Fuel Cell) $6/kW $39/kW #12;Status and Proposed Targets Compressor/Expander for Transportation Fuel Cell System

488

Energy Efficient Proactive Thermal Management in Memory Subsystem  

E-Print Network [OSTI]

improves energy savings by 43% and reduces performance overhead by 85% with respect to the state of the art itself is a power hungry module which consumes a big portion of the total system energy [9]. The cost relationship between fan power and its speed [13]. Recent studies show a growing concern for energy problems

Simunic, Tajana

489

ATF Video Frame Grabber Subsystems - Frequently Asked Questions  

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

III - Re-creating images from captured data (Q1) Using Matlab, how can I recreate an image from captured data (without using the ATF frame grabber program)? (A1) The easiest way is...

490

Vibration analysis of rotor systems using reduced subsystem models  

E-Print Network [OSTI]

the relative motion between the rotor and housing. A detailed analysis of this hydrodynamic coupling force is given in Ref. 1B to 20. Aerodynamic cross-coupling forces are developed when the fluid flows through blades causing a back-flow phenomenon...] is the diagonal matrix of assumed modal damping ratios. In case there are only the coupling forces (FC) at the connecting points to the rotor, the 3l transposed modal matrix [ASS] in equation (44) can 1T further be reduced to sub-matrices corresponding...

Fan, Uei-Jiun

1985-01-01T23:59:59.000Z

491

ATF Video Frame Grabber Subsystems - Frequently Asked Questions  

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

eofg.private.atf.net, videofg2.private.atf.net Video type : Analog, RS-170 Hardware manufacturer: Imaging Technology, Inc. Model : IM-PCI (PCI card) Digitization : 8-bit (fixed)...

492

Collector subsystem official performance test: Test Procedure 118. Revision A  

SciTech Connect (OSTI)

The first objective is to demonstrate the heliostat beam quality by taking beam quality data with the BCS. Beam quality data, shall be taken at two different times per day for each heliostat. Beam quality data for a group of ten heliostats at a given time will be combined as follows to yield a composite beam shape for the group: the centroids of each beam shape will be superimposed by the BCS; the flux values at each BCS grid point will be numerically summed; and the summed fluxes at each point will be divided by ten. The composite beam shape for each group of heliostats will be assumed to represent the beam shape of a single heliostat in the group and will be analyzed using HELIOS to ASSESS compliance with the beam quality specification over the operating temperature range. The second objective is to demonstrate that the beam centroid tracking error for each heliostat is within the tracking error specification. Beam centroid tracking data shall be acquired using BCS. Tracking error data for each heliostat will be compared with the specification value of the RMS error.

Rose, G.R.

1981-09-01T23:59:59.000Z

493

Irreducible Infeasible Subsystem Decomposition for Probabilistically Constrained Stochastic Integer Programs  

E-Print Network [OSTI]

, but it may not be done almost surely. Consider the wild re initial response planning problem for example. This problem involves making e ective strategic resource deployment plans so that the total deployment, relocation, re damage, and dispatch cost... is minimized. Dispatch of resources to all res during a re season may be too expensive, or it may just not be possible, depending on the number of available resources to provide initial response. Thus, strategic deployment decisions should be made while...

Gallego Arrubla, Julian Andres

2013-07-25T23:59:59.000Z

494

Photovoltaic subsystem marketing and distribution model: programming manual. Final report  

SciTech Connect (OSTI)

Complete documentation of the marketing and distribution (M and D) computer model is provided. The purpose is to estimate the costs of selling and transporting photovoltaic solar energy products from the manufacturer to the final customer. The model adjusts for the inflation and regional differences in marketing and distribution costs. The model consists of three major components: the marketing submodel, the distribution submodel, and the financial submodel. The computer program is explained including the input requirements, output reports, subprograms and operating environment. The program specifications discuss maintaining the validity of the data and potential improvements. An example for a photovoltaic concentrator collector demonstrates the application of the model.

Not Available

1982-07-01T23:59:59.000Z

495

Preliminary requirements for thermal storage subsystems in solar thermal applications  

SciTech Connect (OSTI)

Methodologies for the analysis of value and comparing thermal storage concepts are presented. Value is a measure of worth and is determined by the cost of conventional fuel systems. Value data for thermal storage in large solar thermal electric power applications are presented. Thermal storage concepts must be compared when all are performing the same mission. A method for doing that analysis, called the ranking index, is derived. Necessary data to use the methodology are included.

Copeland, R.J.

1980-04-01T23:59:59.000Z

496

Synchrotron-based far infrared study of the rotation-vibration-inversion spectrum of silacyclobutane below 500 cm{sup ?1}: The ?{sub 29} and ?{sub 30} bands  

SciTech Connect (OSTI)

Fourier transform spectra of the four-membered heterocycle silacyclobutane (c-C{sub 3}H{sub 8}Si) were recorded in the far infrared region from 100 to 500 cm{sup ?1} with a maximum resolution of 0.000959 cm{sup ?1} using synchrotron radiation from the Canadian Light Source. The two fundamental bands observed in this region correspond to motions best described as the out-of-plane modes related to ring puckering (?{sub 30}) at ?158 cm{sup ?1} and SiH{sub 2} rocking (?{sub 29}) at ?410 cm{sup ?1}. Both bands exhibit complex, dense spectral patterns that arise from ring inversion tunneling of the puckered SCB ring through a planar (C{sub 2v}) intermediate configuration. Analysis of these patterns revealed rotation-vibration transitions between states of the same inversion symmetry as well as rotation-vibration-inversion transitions that connect states of different inversion symmetry. Infrared ground state combination differences from 1871 pairs of P and R branch transitions were used to accurately determine the spectroscopic parameters for the tunneling-doubled ground state based on a broad range of quantum levels. With the ground state energy levels well-determined, 8255 infrared transitions were assigned and analyzed to derive the band centers, rotational and centrifugal distortion constants for the inversion split ?{sub 29} and ?{sub 30} vibrational states. Comparison with the band centers predicted via DFT (B3LYP) and MP2 calculations [6-311++G(2d,2p)] suggests that anharmonic corrections found via perturbation theory typically agree within 2% when compared with the observed spectrum of SCB.

Chen, Ziqiu; Wijngaarden, Jennifer van, E-mail: vanwijng@cc.umanitoba.ca [Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada)

2013-12-28T23:59:59.000Z

497

Progress Report, December 2010: Improved Site Characterization And Storage Prediction Through Stochastic Inversion Of Time-Lapse Geophysical And Geochemical Data  

SciTech Connect (OSTI)

Over the last project six months, our project activities have concentrated on three areas: (1) performing a stochastic inversion of pattern 16 seismic data to deduce reservoir permeability, (2) development of the geochemical inversion strategy and implementation of associated software, and (3) completing the software implementation of TProGS and the geostatistical analysis that provides the information needed when using the software to produce realizations of the Midale reservoir. The report partially the following deliverables: D2: Model development: MCMC tool (synthetic fluid chemistry data); deliverable completed. D4: Model development/verification: MCMC tool (TProGS, field seismic/chemistry data) work product; deliverable requirements partially fulfilled. D5: Field-based single-pattern simulations work product; deliverable requirements partially fulfilled. When completed, our completed stochastic inversion tool will explicitly integrate reactive transport modeling, facies-based geostatistical methods, and a novel stochastic inversion technique to optimize agreement between observed and predicted storage performance. Such optimization will be accomplished through stepwise refinement of: (1) the reservoir model - principally its permeability magnitude and heterogeneity - and (2) geochemical parameters - primarily key mineral volume fractions and kinetic data. We anticipate that these refinements will facilitate significantly improved history matching and forward modeling of CO{sub 2} storage. Our tool uses the Markov Chain Monte Carlo (MCMC) methodology. Deliverable D1, previously submitted as a report titled ''Development of a Stochastic Inversion Tool To Optimize Agreement Between The Observed And Predicted Seismic Response To CO{sub 2} Injection/Migration in the Weyburn-Midale Project'' (Ramirez et al., 2009), described the stochastic inversion approach that will identify reservoir models that optimize agreement between the observed and predicted seismic response. The software that implements this approach has been completed, tested, and used to process seismic data from pattern 16. A previously submitted report titled ''Model verification: synthetic single pattern simulations using seismic reflection data'', Ramirez et al. 2010, partially fulfilled deliverable D3 by summarizing verification activities that evaluate the performance of the seismic software and its ability to recover reservoir model permeabilities using synthetic seismic reflection data. A future progress report will similarly describe summarizing verification activities of the geochemical inversion software, thereby completing deliverable D3. This document includes a chapter that shows and discusses permeability models produced by seismic inversion that used seismic data from pattern 16 in Phase 1A. It partially fulfills deliverable D5: Field-based single-pattern simulations work product. The D5 work product is supposed to summarize the results of applying NUFT/MCMC to refine the reservoir model and geochemical parameters by optimizing observation/prediction agreement for the seismic/geochemical response to CO{sub 2} injection/migration within a single pattern of Phase 1A/1B. A future progress report will show inversion results for the same pattern using geochemical data, thereby completing deliverable D5. This document also contains a chapter that fulfills deliverable D2: Model development: MCMC tool (synthetic fluid chemistry data). The chapter will summarize model development activities required to facilitate application of NUFT/MCMC to optimize agreement between the observed and predicted geochemical response to CO{sub 2} injection/migration. Lastly, this document also contains a chapter that partially fulfills deliverable D4: Model development/verification: MCMC tool (TProGS, field seismic/chemistry data) work product. This work product is supposed to summarize model development activities required for (1) application of TProGS to Weyburn, (2) use of TProGS within the MCMC tool, and (3) application of the MCMC tool to address field seismic and g

Ramirez, A; Mcnab, W; Carle, S; Hao, Y; White, D; Johnson, J

2010-12-17T23:59:59.000Z

498

Imprints of deviations from the gravitational inverse-square law on the power spectrum of mass fluctuations  

E-Print Network [OSTI]

Deviations from the gravitational inverse-square law would imprint scale-dependent features on the power spectrum of mass density fluctuations. We model such deviations as a Yukawa-like contribution to the gravitational potential and discuss the growth function in a mixed dark matter model with adiabatic initial conditions. Evolution of perturbations is considered in general non-flat cosmological models with a cosmological constant, and an analytical approximation for the growth function is provided. The coupling between baryons and cold dark matter across recombination is negligibly affected by modified gravity physics if the proper cutoff length of the long-range Yukawa-like force is > 10 h^{-1} Mpc. Enhancement of gravity affects the subsequent evolution, boosting large-scale power in a way that resembles the effect of a lower matter density. This phenomenon is almost perfectly degenerate in power-spectrum shape with the effect of a background of massive neutrinos. Back-reaction on density growth from a modified cosmic expansion rate should however also affect the normalization of the power spectrum, with a shape distortion similar to the case of a non-modified background.

M. Sereno; J. A. Peacock

2006-05-19T23:59:59.000Z

499

Numerical inverse method predicting acoustic spinning modes radiated by a ducted fan from free-field test dataa)  

Science Journals Connector (OSTI)

Spinning modes generated by a ducted turbofan at a given frequency determine the acoustic free-field directivity. An inverse method starting from measured directivity patterns is interesting in providing information on the noise sources without requiring tedious spinning-mode experimental analyses. According to a previous article equations are based on analytical modal splitting inside a cylindrical duct and on a Rayleigh or a Kirchhoff integral on the duct exit cross section to get far-field directivity. Equations are equal in number to free-field measurement locations and the unknowns are the propagating mode amplitudes (there are generally more unknowns than equations). A MATLAB procedure has been implemented by using either the pseudoinverse function or the backslash operator. A constraint comes from the fact that squared modal amplitudes must be positive which involves an iterative least squares fitting. Numerical simulations are discussed along with several examples based on tests performed by RollsRoyce in the framework of a European project. It is assessed that computation is very fast and it well fits the measured directivities but the solution depends on the method and is not unique. This means that the initial set of modes should be chosen according to any known physical property of the acoustic sources.

Serge Lewy

2008-01-01T23:59:59.000Z

500

A Model of the EGRET Source at the Galactic Center: Inverse Compton Scattering Within Sgr A East and its Halo  

E-Print Network [OSTI]

Continuum low-frequency radio observations of the Galactic Center reveal the presence of two prominent radio sources, Sgr A East and its surrounding Halo, containing non-thermal particle distributions with power-law indices around 2.5-3.3 and 2.4, respectively. The central 1-2 pc region is also a source of intense (stellar) UV and (dust-reprocessed) far-IR radiation that bathes these extended synchrotron-emitting structures. A recent detection of gamma-rays (2EGJ1746-2852) from within around 1 degree of the Galactic Center by EGRET onboard the Compton GRO shows that the emission from this environment extends to very high energies. We suggest that inverse Compton scatterings between the power-law electrons inferred from the radio properties of Sgr A East and its Halo, and the UV and IR photons from the nucleus, may account for the possibly diffuse gamma-ray source as well. We show that both particle distributions may be contributing to the gamma-ray emission, though their relevant strength depends on the actual physical properties (such as the magnetic field intensity) in each source. If this picture is correct, the high-energy source at the Galactic Center is extended over several arcminutes, which can be tested with thenext generation of gamma-ray and hard X-ray missions.

Fulvio Melia; Farhad Yusef-Zadeh; Marco Fatuzzo

1998-06-24T23:59:59.000Z