Radiance | Department of Energy
Broader source: Energy.gov (indexed) [DOE]
retrofit of the New York Times offices in New York.
Image credit: Andrew McNeil, LBNL. Radiance rendering of daylighting and electric lighting for the retrofit of the New...
On quantum subsystem measurement
Fedor Herbut
2013-02-09T23:59:59.000Z
It is assumed that an arbitrary composite bipartite pure state in which the two subsystems are entangled is given, and it is investigated how the entanglement transmits the influence of measurement on only one of the subsystems to the state of the opposite subsystem. It is shown that any exact subsystem measurement has the same influence as ideal measurement on the opposite subsystem. In particular, the distant effect of subsystem measurement of a twin observable, i. e., so-called 'distant measurement', is always ideal measurement on the distant subsystem no matter how intricate the direct exact measurement on the opposite subsystem is.
Pradeep Kiran Sarvepalli; Andreas Klappenecker
2008-06-30T23:59:59.000Z
In this paper we investigate the encoding of operator quantum error correcting codes i.e. subsystem codes. We show that encoding of subsystem codes can be reduced to encoding of a related stabilizer code making it possible to use all the known results on encoding of stabilizer codes. Along the way we also show how Clifford codes can be encoded. We also show that gauge qubits can be exploited to reduce the encoding complexity.
The Radiance Process: Water and Chemical Free Cleaning
Robison, J. H.
1998-01-01T23:59:59.000Z
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...
Modelling TOVS radiances of synoptic systems
Coe, Thomas Eddy
1992-01-01T23:59:59.000Z
MODELLING TOVS RADIANCES OF SYNOPTIC SYSTEMS A Thesis THOMAS EDDY COE Submitted to the Office of Graduate Studies of TBxBs AFxM Unlvezs&ty in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE December 1992 Major... Subject: Meteorology MODELLING TOVS RADIANCES OF SYNOPTIC SYSTEMS THOMAS EDDY COE Approved as to style and content by: James P. McGairk (Chair of Committee) gW('. Denrus M. Driscoll (~) J B. Valdes ~) ~ J. Zi (Head of Deparbrent) Decemter 1992...
A Gentle Introduction to Precomputed Radiance Transfer
Oliveira, Manuel M.
in computer graphics, and many algorithms have been developed to try to reproduce the visual complexity with the support of modern graphics hardware. Precomputed Radiance Transfer (PRT) is a new graphics technique of the rendering equation to a subset of the light transport paths that handle only energy exchange among diffuse
Open Subsystems of Conservative Systems
Alexander Figotin; Stephen P. Shipman
2006-01-12T23:59:59.000Z
The subject under study is an open subsystem of a larger linear and conservative system and the way in which it is coupled to the rest of system. Examples are a model of crystalline solid as a lattice of coupled oscillators with a finite piece constituting the subsystem, and an open system such as the Helmholtz resonator as a subsystem of a larger conservative oscillatory system. Taking the view of an observer accessing only the open subsystem we ask, in particular, what information about the entire system can be reconstructed having such limited access. Based on the unique minimal conservative extension of an open subsystem, we construct a canonical decomposition of the conservative system describing, in particular, its parts coupled to and completely decoupled from the open subsystem. The coupled one together with the open system constitute the unique minimal conservative extension. Combining this with an analysis of the spectral multiplicity, we show, for the lattice model in particular, that only a very small part of all possible oscillatory motion of the entire crystal, described canonically by the minimal extension, is coupled to the finite subsystem.
Acceleration of the matrix multiplication of Radiance three phase daylighting simulations
LBNL-6461E Acceleration of the matrix multiplication of Radiance three phase daylighting multiplication of Radiance three phase daylighting simulations with parallel computing on heterogeneous hardware. Radiance, a lighting simulation program, has been used to conduct daylighting simulations for complex
Holonomic quantum computation in subsystems
Ognyan Oreshkov
2009-08-28T23:59:59.000Z
We introduce a generalized method of holonomic quantum computation (HQC) based on encoding in subsystems. As an application, we propose a scheme for applying holonomic gates to unencoded qubits by the use of a noisy ancillary qubit. This scheme does not require initialization in a subspace since all dynamical effects factor out as a transformation on the ancilla. We use this approach to show how fault-tolerant HQC can be realized via 2-local Hamiltonians with perturbative gadgets.
Holonomic quantum computation in subsystems
Oreshkov, Ognyan
2009-01-01T23:59:59.000Z
We introduce a generalized method of holonomic quantum computation (HQC) based on encoding in subsystems. As an application, we propose a scheme for applying holonomic gates to unencoded qubits by the use of a noisy ancillary qubit. This scheme does not require initialization in a subspace since all dynamical effects factor out as a transformation on the ancilla. We use the scheme to show how fault-tolerant HQC can be realized via 2-local Hamiltonians by the use of perturbative gadgets.
Absolute spectral radiance responsivity calibration of sun photometers
Xu Qiuyun; Zheng Xiaobing; Zhang Wei; Wang Xianhua; Li Jianjun; Li Xin [Key Laboratory of Optical Calibration and Characterization, Chinese Academy of Sciences, Hefei 230031 (China); Li Zhengqiang [Laboratoire d'Optique Atmospherique, Universite Lille 1, Villeneuve d'Ascq 59655 (France) and State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing 100101 (China)
2010-03-15T23:59:59.000Z
Sun photometers are designed to measure direct solar irradiance and diffused sky radiance for the purpose of atmospheric parameters characterization. A sun photometer is usually calibrated by using a lamp-illuminated integrating sphere source for its band-averaged radiance responsivity, which normally has an uncertainty of 3%-5% at present. Considering the calibration coefficients may also change with time, a regular high precision calibration is important to maintain data quality. In this paper, a tunable-laser-based facility for spectral radiance responsivity calibration has been developed at the Key Laboratory of Optical Calibration and Characterization, Chinese Academy of Sciences. A reference standard radiance radiometer, calibrated against cryogenic radiometer, is used to determine the radiance from a laser-illuminated integrating sphere source. Spectral radiance responsivity of CIMEL CE318-2 sun photometer is calibrated using this new calibration system with a combined standard uncertainty of about 0.8%. As a validation, the derived band-averaged radiance responsivity are compared to that from a Goddard Space Flight Center lamp-based sphere calibration and good agreements (difference <1.4%) are found from 675 to 1020 nm bands.
Measuring absolute infrared spectral radiance with correlated photons: new arrangements
Migdall, Alan
metrologia Measuring absolute infrared spectral radiance with correlated photons: new arrangements must be created in pairs, the VIS channel is also stimulated. In this Metrologia, 1998, 35, 295-300 295
General approach to automation of FLASH subsystems
General approach to automation of FLASH subsystems Boguslaw Kosda #12;Agenda Motivation Nature of automation software for high energy experiments. Ultimate role of the automation software: Maximization of lasers availability. Automation of routine activities as startup, shutdown ... Continuous monitoring
Maintenance cost studies of present aircraft subsystems
Pearlman, Chaim Herman Shalom
1966-01-01T23:59:59.000Z
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 ...
Analytical Tool Development for Aftertreatment Sub-Systems Integration...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Tool Development for Aftertreatment Sub-Systems Integration Analytical Tool Development for Aftertreatment Sub-Systems Integration 2003 DEER Conference Presentation: Detroit Diesel...
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...
Periodic subsystem density-functional theory
Genova, Alessandro; Pavanello, Michele, E-mail: m.pavanello@rutgers.edu [Department of Chemistry, Rutgers University, Newark, New Jersey 07102 (United States); Ceresoli, Davide [Department of Chemistry, Rutgers University, Newark, New Jersey 07102 (United States); CNR-ISTM, Institute of Molecular Sciences and Technologies, Milano (Italy)
2014-11-07T23:59:59.000Z
By partitioning the electron density into subsystem contributions, the Frozen Density Embedding (FDE) formulation of subsystem Density Functional Theory (DFT) has recently emerged as a powerful tool for reducing the computational scaling of Kohn–Sham DFT. To date, however, FDE has been employed to molecular systems only. Periodic systems, such as metals, semiconductors, and other crystalline solids have been outside the applicability of FDE, mostly because of the lack of a periodic FDE implementation. To fill this gap, in this work we aim at extending FDE to treat subsystems of molecular and periodic character. This goal is achieved by a dual approach. On one side, the development of a theoretical framework for periodic subsystem DFT. On the other, the realization of the method into a parallel computer code. We find that periodic FDE is capable of reproducing total electron densities and (to a lesser extent) also interaction energies of molecular systems weakly interacting with metallic surfaces. In the pilot calculations considered, we find that FDE fails in those cases where there is appreciable density overlap between the subsystems. Conversely, we find FDE to be in semiquantitative agreement with Kohn–Sham DFT when the inter-subsystem density overlap is low. We also conclude that to make FDE a suitable method for describing molecular adsorption at surfaces, kinetic energy density functionals that go beyond the GGA level must be employed.
Codeword stabilized quantum codes on subsystems
Jeonghwan Shin; Jun Heo; Todd A. Brun
2012-08-29T23:59:59.000Z
Codeword stabilized quantum codes provide a unified approach to constructing quantum error-correcting codes, including both additive and non-additive quantum codes. Standard codeword stabilized quantum codes encode quantum information into subspaces. The more general notion of encoding quantum information into a subsystem is known as an operator (or subsystem) quantum error correcting code. Most operator codes studied to date are based in the usual stabilizer formalism. We introduce operator quantum codes based on the codeword stabilized quantum code framework. Based on the necessary and sufficient conditions for operator quantum error correction, we derive a error correction condition for operator codeword stabilized quantum codes. Based on this condition, the word operators of a operator codeword stabilized quantum code are constructed from a set of classical binary errors induced by generators of the gauge group. We use this scheme to construct examples of both additive and non-additive codes that encode quantum information into a subsystem.
National Ingition Facility subsystem design requirements optics subsystems SSDR 1.6
English, R.E.
1996-08-30T23:59:59.000Z
This Subsystems Design Requirement (SSDR) document specifies the functions to be performed and the subsystems design requirements for the major optical components. These optical components comprise those custom designed and fabricated for amplification and transport of the full aperture NIF beam and does not include those off-the-shelf components that may be part of other optical sub-systems (i.e. alignment or diagnostic systems). This document also describes the optical component processing requirements and the QA/damage testing necessary to ensure that the optical components meet or exceed the requirements.
Analytical Green's function of the radiative transfer radiance for the infinite medium
Liemert, Andre; Kienle, Alwin [Institut fuer Lasertechnologien in der Medizin und Messtechnik, Helmholtzstrasse12, D-89081 Ulm (Germany)
2011-03-15T23:59:59.000Z
An analytical solution of the radiative transfer equation for the radiance caused by an isotropic source which is located in an infinitely extended medium was derived using the P{sub N} method. The results were compared with Monte Carlo simulations and excellent agreement was found. In addition, the radiance of the SP{sub N} approximation for the same geometry was derived. Comparison with Monte Carlo simulations showed that the SP{sub N} radiance, although being more exact than the radiance derived from diffusion theory, has relatively large errors in many relevant cases.
On Subsystem Codes Beating the Hamming or Singleton Bound
Andreas Klappenecker; Pradeep Kiran Sarvepalli
2007-03-22T23:59:59.000Z
Subsystem codes are a generalization of noiseless subsystems, decoherence free subspaces, and quantum error-correcting codes. We prove a Singleton bound for GF(q)-linear subsystem codes. It follows that no subsystem code over a prime field can beat the Singleton bound. On the other hand, we show the remarkable fact that there exist impure subsystem codes beating the Hamming bound. A number of open problems concern the comparison in performance of stabilizer and subsystem codes. One of the open problems suggested by Poulin's work asks whether a subsystem code can use fewer syndrome measurements than an optimal MDS stabilizer code while encoding the same number of qudits and having the same distance. We prove that linear subsystem codes cannot offer such an improvement under complete decoding.
Three Main Subsystems: I. Centerpiece (Linear Actuation)
Provancher, William
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
Subsystem codes with spatially local generators
Bravyi, Sergey [IBM T. J. Watson Research Center, Yorktown Heights, New York 10598 (United States)
2011-01-15T23:59:59.000Z
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 LxL 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 d{sup 2}=O(n). The analogous upper bound proved recently for 2D stabilizer codes is kd{sup 2}=O(n). Our results thus demonstrate that subsystem codes can be more powerful than stabilizer codes under the spatial locality constraint.
Subsystem codes with spatially local generators
Sergey Bravyi
2010-08-05T23:59:59.000Z
We study subsystem codes whose gauge group has local generators in the 2D geometry. It is shown that there exists a family of such codes defined on lattices of size LxL 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 which 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 d^2=O(n). The analogous upper bound proved recently for 2D stabilizer codes is kd^2=O(n). Our results thus demonstrate that subsystem codes can be more powerful than stabilizer codes under the spatial locality constraint.
Energy Efficient Proactive Thermal Management in Memory Subsystem
Simunic, Tajana
Energy Efficient Proactive Thermal Management in Memory Subsystem Raid Ayoub rayoub management of memory subsystem is challenging due to performance and thermal constraints. Big energy gains appreciable energy savings in memory sub-system and mini- mize thermal problems. We adopt the consolidation
Space-reactor electric systems: subsystem technology assessment
Anderson, R.V.; Bost, D.; Determan, W.R.
1983-03-29T23:59:59.000Z
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.
O'Brien, James F.
Precomputed Radiance Transfer for Real-Time Rendering in Dynamic, Low-Frequency Lighting a new, real-time method for rendering diffuse and glossy objects in low-frequency lighting environments-frequency incident lighting into transferred radiance which includes global effects like shadows and interreflections
Double Shell Tank (DST) Process Waste Sampling Subsystem Definition Report
RASMUSSEN, J.H.
2000-04-25T23:59:59.000Z
This report defines the Double-Shell Tank (DST) Process Waste Sampling Subsystem (PWSS). This subsystem definition report fully describes and identifies the system boundaries of the PWSS. This definition provides a basis for developing functional, performance, and test requirements (i.e., subsystem specification), as necessary, for the PWSS. The resultant PWSS specification will include the sampling requirements to support the transfer of waste from the DSTs to the Privatization Contractor during Phase 1 of Waste Feed Delivery.
A comparison of model-generated and satellite-observed radiances
Smith, Donna Ellen Woolley
1989-01-01T23:59:59.000Z
periods in January: Every 12 hours between 21 January at 12 GMT and 29 January at 00 GMT. 2. Ten time periods in May: Every 12 hours between 12 May at 12 GMT and 17 May at 00 GMT, B. TIROS-N HIRS/MSU Radiances Channel radiances used as ground truth... are discussed in Chapter IV. Detailed information is described by Smith et al. (1979). Satellite radiances are not observed synoptically at 00 GMT and 12 GMT. Therefore, measurements made during satellite passes within three hours of Sponsored...
Joint Extension of States of Subsystems for a CAR System
Huzihiro Araki; Hajime Moriya
2004-05-14T23:59:59.000Z
The problem of existence and uniqueness of a state of a joint system with given restrictions to subsystems is studied for a Fermion system, where a novel feature is non-commutativity between algebras of subsystems. For an arbitrary (finite or infinite) number of given subsystems, a product state extension is shown to exist if and only if all states of subsystems except at most one are even (with respect to the Fermion number). If the states of all subsystems are pure, then the same condition is shown to be necessary and sufficient for the existence of any joint extension. If the condition holds, the unique product state extension is the only joint extension. For a pair of subsystems, with one of the given subsystem states pure, a necessary and sufficient condition for the existence of a joint extension and the form of all joint extensions (unique for almost all cases) are given. For a pair of subsystems with non-pure subsystem states, some classes of examples of joint extensions are given where non-uniqueness of joint extensions prevails.
Functional Analysis for Double Shell Tank (DST) Subsystems
CONRADS, T.J.
2000-01-12T23:59:59.000Z
This analysis identifies the DST Subsystem functions for storing, transferring, receiving, and preparing waste in support of the Waste Feed Delivery mission.
aftertreatment subsystem development: Topics by E-print Network
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AREVA T&D's aluminium electrolysis conversion substations: Environmental evaluation; Life cycle assessment; Complex system; Subsystem; Aluminium electrolysis conversion Paris-Sud...
Moffitt, John Russell
1972-01-01T23:59:59.000Z
SEMIANALYTIC MONTE CARLO CALCULATION OF REFLECTED AND TRANSMITTED RADIANCE IN A PLANE PARALLEL ATMOSPHERE A Thesis by JOHN RUSSELL MOFFITT Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE August 1972 Major Subject: Physics SEMIANALYTIC MONTE CARLO CALCULATION OF REFLECTED AND TRANSMITTED RADIANCE IN A PLANE PARALLEL ATMOSPHERE A Thesis by JOHN RUSSELL MOFFITT Approved as to style and content by: (Cha...
Double Shell Tank (DST) Monitor and Control Subsystem Definition Report
BAFUS, R.R.
2000-03-16T23:59:59.000Z
The system description of the Double-Shell Tank (DST) Monitor and Control Subsystem establishes the system boundaries and describes the interface of the DST Monitor and Control Subsystem with new and existing systems that are required to accomplish the Waste Feed Delivery (WFD) mission.
Subsystem response review. Seismic Safety Margins Research Program
Kennedy, R. P.; Campbell, R. D.; Wesley, D. A.; Kamil, H.; Gantayat, A.; Vasudevan, R.
1981-02-01T23:59:59.000Z
A study was conducted to document the state of the art in seismic qualification of nuclear power plant components and subsystems by analysis and testing and to identify the sources and magnitude of the uncertainties associated with analysis and testing methods. The uncertainties are defined in probabilistic terms for use in probabilistic seismic risk studies. Recommendations are made for the most appropriate subsystem response analysis methods to minimize response uncertainties. Additional studies, to further quantify testing uncertainties, are identified. Although the general effect of non-linearities on subsystem response is discussed, recommendations and conclusions are based principally on linear elastic analysis and testing models.
Quantum Error Correcting Subsystem Codes From Two Classical Linear Codes
Dave Bacon; Andrea Casaccino
2006-10-17T23:59:59.000Z
The essential insight of quantum error correction was that quantum information can be protected by suitably encoding this quantum information across multiple independently erred quantum systems. Recently it was realized that, since the most general method for encoding quantum information is to encode it into a subsystem, there exists a novel form of quantum error correction beyond the traditional quantum error correcting subspace codes. These new quantum error correcting subsystem codes differ from subspace codes in that their quantum correcting routines can be considerably simpler than related subspace codes. Here we present a class of quantum error correcting subsystem codes constructed from two classical linear codes. These codes are the subsystem versions of the quantum error correcting subspace codes which are generalizations of Shor's original quantum error correcting subspace codes. For every Shor-type code, the codes we present give a considerable savings in the number of stabilizer measurements needed in their error recovery routines.
Double Shell Tank (DST) Monitor and Control Subsystem Specification
BAFUS, R.R.
2000-11-03T23:59:59.000Z
This specification revises the performance requirements and provides references to the requisite codes and standards to be applied during design of the Double-Shell Tank (DST) Monitor and Control Subsystem that supports the first phase of Waste Feed Delivery.
Double Shell Tank (DST) Process Waste Sampling Subsystem Specification
RASMUSSEN, J.H.
2000-05-03T23:59:59.000Z
This specification establishes the performance requirements and provides references to the requisite codes and standards to be applied to the Double-Shell Tank (DST) Process Waste Sampling Subsystem which supports the first phase of Waste Feed Delivery.
Development of Pattern Recognition Options for Combining Safeguards Subsystems
Burr, Thomas L. [Los Alamos National Laboratory; Hamada, Michael S. [Los Alamos National Laboratory
2012-08-24T23:59:59.000Z
This talk reviews project progress in combining process monitoring data and nuclear material accounting data to improve the over nuclear safeguards system. Focus on 2 subsystems: (1) nuclear materials accounting (NMA); and (2) process monitoring (PM).
alarm subsystem design: Topics by E-print Network
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paper describes the design of the active muon veto subsystem for the MiniCLEAN dark matter direct detection experiment at SNOLAB in Sudbury, Ontario, Canada. The water-filled...
Asymptotics of the quantum Hamming bound for subsystem codes
Andreas Klappenecker; Pradeep Kiran Sarvepalli
2007-10-23T23:59:59.000Z
Ashikhmin and Litsyn showed that all binary stabilizer codes - pure or impure - of sufficiently large length obey the quantum Hamming bound, ruling out the possibility that impure codes of large length can outperform pure codes with respect to sphere packing. In contrast we show that impure subsystem codes do not obey the quantum Hamming bound for pure subsystem codes, not even asymptotically. We show that there exist arbitrarily long Bacon-Shor codes that violate the quantum Hamming bound.
Gamma Ray Array Detector Trigger Sub-System
Du Zhong-Wei; Su Hong; Qian Yi; Kong Jie
2013-05-19T23:59:59.000Z
Gamma Ray Array Detector (GRAD) is one of External Target Facility (ETF) subsystems at the Heavy Ion Research Facility at Lanzhou. The trigger subsystem of the GRAD has been developed based on Field Programmable Gate Array (FPGAs) and PXI interface. The GRAD trigger subsystem makes prompt L1 trigger decisions to select valid events. These decisions are made by processing the hit signals from 1024 CsI scintillators of the GRAD. According to the physical requirements, the GRAD trigger subsystem generates 12-bit trigger signals that are passed to the ETF global trigger system. In addition, the GRAD trigger subsystem generates trigger data that are packed and transmitted to the host computer via PXI bus for off-line analysis. The trigger processing is implemented in the front-end electronics and one FPGA of the trigger module. The logic of PXI transmission and reconfiguration is implemented in the other FPGA of the trigger module. The reliable and efficient performance in the Gamma-ray experiments demonstrates that the GRAD trigger subsystem is capable to satisfy the physical requirements.
Horizon brightness revisited: measurements and a model of clear-sky radiances
Lee Jr., Raymond L.
from solar energy engineering2 ,3 to atmospheric optics4'5 have repeatedly measured and modeled. Second, before the advent of narrow field-of-view (FOV) radiometers8 and photographic analysis tech explanation of the phenomenon. High-Resolution Measurements of Clear-Sky Radiances We beginby electronically
Solar Energy, 2006, 80, 3, 361-367 SIMULATING METEOSAT-7 BROADBAND RADIANCES USING TWO
Paris-Sud XI, Université de
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
The Five-Phase Method for Simulating Complex Fenestration with Radiance
series of illuminance or luminance result V = View matrix, relating outgoing directions on window the sun luminance (no sky luminance) Ssun = Direct sun matrix containing the radiance and position of the luminance contributions that are used in the five-phase for a space with clear glazing. E3ph - Eds-3ph + Eds
Stephens, Graeme L.
from infrared radiances Steven J. Cooper, Tristan S. L'Ecuyer, and Graeme L. Stephens Department inclusion of explicit cloud boundary information from complementary sensors as well as providing a suite of diagnostic tools for evaluating the dominant sources of uncertainty in all retrieved quantities. Errors
Salvaggio, Carl
efforts in phenomenology studies, algorithm development, and sensor evaluation. Synthetic scenes are also and op- tical properties of wildfire and burn area in an infrared remote sensing system will assist look like as seen by the airborne sensor. Radiance scene rendering of the 3D flame iv #12;v includes 2D
Remote sensing of Greenland ice sheet using multispectral near-infrared and visible radiances
Dozier, Jeff
Remote sensing of Greenland ice sheet using multispectral near-infrared and visible radiances Petr microwave methods. The method should be useful for long-term monitoring of the melt area of the Greenland of MODIS retrievals of the western portion of the Greenland ice sheet over the period 2000 to 2006
Double Shell Tank (DST) Transfer Piping Subsystem Specification
GRAVES, C.E.
2000-03-22T23:59:59.000Z
This specification establishes the performance requirements and provides references to the requisite codes and standards to be applied during design of the Double-Shell Tank (DST) Transfer Piping Subsystem that supports the first phase of Waste Feed Delivery. This specification establishes the performance requirements and provides references to the requisite codes and standards to be applied during design of the Double-Shell Tank (DST) Transfer Piping Subsystem that supports the first phase of waste feed delivery. This subsystem transfers waste between transfer-associated structures (pits) and to the River Protection Project (RPP) Privatization Contractor Facility where it will be processed into an immobilized waste form. This specification is intended to be the basis for new projects/installations (W-521, etc.). This specification is not intended to retroactively affect previously established project design criteria without specific direction by the program.
Functional Subsystems and Quantum Redundancy in Photosynthetic Light Harvesting
Nolan Skochdopole; David A. Mazziotti
2011-12-07T23:59:59.000Z
The Fenna-Matthews-Olson (FMO) antennae complex, responsible for light harvesting in green sulfur bacteria, consists of three monomers, each with seven chromophores. Here we show that multiple subsystems of the seven chromophores can transfer energy from either chromophore 1 or 6 to the reaction center with an efficiency matching or in many cases exceeding that of the full seven chromophore system. In the FMO complex these functional subsystems support multiple quantum pathways for efficient energy transfer that provide a built-in quantum redundancy. There are many instances of redundancy in nature, providing reliability and protection, and in photosynthetic light harvesting this quantum redundancy provides protection against the temporary or permanent loss of one or more chromophores. The complete characterization of functional subsystems within the FMO complex offers a detailed map of the energy flow within the FMO complex, which has potential applications to the design of more efficient photovoltaic devices.
Process of preparing metal parts to be heated by means of infrared radiance
Mayer, Howard Robinson (Cincinnati, OH); Blue, Craig A. (Knoxville, TN)
2009-06-09T23:59:59.000Z
A method for preparing metal for heating by infrared radiance to enable uniform and consistent heating. The surface of one or more metal parts, such as aluminum or aluminum alloy parts, is treated to alter the surface finish to affect the reflectivity of the surface. The surface reflectivity is evaluated, such as by taking measurements at one or more points on the surface, to determine if a desired reflectivity has been achieved. The treating and measuring are performed until the measuring indicates that the desired reflectivity has been achieved. Once the treating has altered the surface finish to achieve the desired reflectivity, the metal part may then be exposed to infrared radiance to heat the metal part to a desired temperature, and that heating will be substantially consistent throughout by virtue of the desired reflectivity.
Zhou, Kun
--We present a real-time algorithm to render all-frequency radiance transfer at both macro-scale and meso-scale. At a meso-scale, the shading is computed on a per-pixel basis by integrating the product of the local inci in a meso-scale, densely sampled at each pixel and mapped over the object. The bi-scale transfer
Barnie, Talfan; Oppenheimer, Clive
2014-12-01T23:59:59.000Z
radiance from other sources, such as reflected sunlight and thermal emission from ground, clouds and atmo- sphere as well as instrument response effects such as stray light image pixel size and irregular acquisition intervals which make analysing data from... sources are strongly non-Gaussian and will tend to give more Gaussian signals when mixed with radiative signals from other environmental processes (the diurnal cycle, cloud cover, etc.). Given volcanic thermal signals tend to be isolated discrete events...
Entrekin, Robert David
1976-01-01T23:59:59.000Z
NUMERICAL CALCULATION OF REFLECTED AND TRANSMITTED RADIANCE IN A PLANE PARALLEL ATMOSPHERE BY DOUBLING VERY THIN LAYERS A Thesis by ROBERT DAVID ENTREKIN Submitted to the Graduate College of Texas ASM University in partial fulfillment... of the requirement for the degree of MASTER OF SCIENCE December 1976 Major Subject: Physics NUMERICAL CALCULATION OF REFLECTED AND TRANSMITTED RADIANCE IN A PLANE PARALLEL ATMOSPHERE BY DOUBLING VERY THIN LAYERS A Thesis by ROBERT DAVID ENTREKIN Approved...
Subsystem real-time Time Dependent Density Functional Theory
Krishtal, Alisa; Pavanello, Michele
2015-01-01T23:59:59.000Z
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.
Shieh, L. C.; Chuang, T. Y.; O'Connell, W. J.
1981-07-01T23:59:59.000Z
This document reports on (1) the computation of the responses of subsystems, given the input subsystem support motion for components and systems whose failure can lead to an accident sequence (radioactive release), and (2) the results of a sensitivity study undertaken to determine the contributions of the several links in the seismic methodology chain (SMC) - seismic input (SI), soil-structure interaction (SSI), structure response (STR), and subsystem response (SUB) - to the uncertainty in subsystem response.
Radioisotope thermoelectric generator transportation system subsystem 143 software development plan
King, D.A.
1994-11-10T23:59:59.000Z
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.
Photovoltaic subsystem optimization and design tradeoff study. Final report
Stolte, W.J.
1982-03-01T23:59:59.000Z
Tradeoffs and subsystem choices are examined in photovoltaic array subfield design, power-conditioning sizing and selection, roof- and ground-mounted structure installation, energy loss, operating voltage, power conditioning cost, and subfield size. Line- and self-commutated power conditioning options are analyzed to determine the most cost-effective technology in the megawatt power range. Methods for reducing field installation of flat panels and roof mounting of intermediate load centers are discussed, including the cost of retrofit installations.
Double Shell Tank (DST) Transfer Pump Subsystem Specification
LESHIKAR, G.A.
2000-03-27T23:59:59.000Z
This specification establishes the performance requirements and provides references to the requisite codes and standards to be applied to the Double-Shell Tank (DST) Transfer Pump Subsystem which supports the first phase of Waste Feed Delivery (WFD). This specification establishes the performance requirements and provides the references to the requisite codes and standards to be applied during the design of the DST Transfer Pump Subsystem that supports the first phase of (WFD). The DST Transfer Pump Subsystem consists of a pump for supernatant and or slurry transfer for the DSTs that will be retrieved during the Phase 1 WFD operations. This system is used to transfer low-activity waste (LAW) and high-level waste (HLW) to designated DST staging tanks. It also will deliver blended LAW and HLW feed from these staging tanks to the River Protection Project (RPP) Privatization Contractor facility where it will be processed into an immobilized waste form. This specification is intended to be the basis for new projects/installations (W-521, etc.). This specification is not intended to retroactively affect previously established project design criteria without specific direction by the program.
Oldenburg, Douglas W.
UBC Geophysical InversionFacility Modelling and Inversion of EMI data collected over magnetic soils of EMI data acquired at sites with magnetic soils Â· Geophysical Proveouts Â· Geonics EM63 Data Â· First model parameters: Â· Location Â· Orientation Â· Polarizabilities 4 #12;UBC Geophysical Inversion Facility
Systems and methods for an integrated electrical sub-system powered by wind energy
Liu, Yan (Ballston Lake, NY); Garces, Luis Jose (Niskayuna, NY)
2008-06-24T23:59:59.000Z
Various embodiments relate to systems and methods related to an integrated electrically-powered sub-system and wind power system including a wind power source, an electrically-powered sub-system coupled to and at least partially powered by the wind power source, the electrically-powered sub-system being coupled to the wind power source through power converters, and a supervisory controller coupled to the wind power source and the electrically-powered sub-system to monitor and manage the integrated electrically-powered sub-system and wind power system.
McNeil, Andrew
2013-01-01T23:59:59.000Z
J. , 2011. Simulating the Daylight Performance of Complexof dynamic RADIANCE-based daylight simulations for a testS.E. , 1998. Energy and Daylight Performance of Angular
NOx control subsystem test plan: LEBS Phase II
NONE
1995-03-16T23:59:59.000Z
It is planned that NO{sub x} control subsystem testing in support of Phase II of the Low-Emissions Boiler Systems (LEBS) Project occur in ABB Power Plant Laboratories` (PPL) pilot scale Boiler Simulation Facility (BSF). This work will be performed to provide necessary design and operational information for inclusion of an optimized NO, control subsystem in the Proof-of-Concept Test Facility (POCTF) and Commercial Generating Unit (CGU) designs. The BSF is a 50 to 90x10{sup 6} BTU/hr (15 to 26 MWt) coal, oil or natural gas fired tangential furnace designed to replicate the residence time/temperature history of a utility scale tangentially fired boiler. All major aspects of a typical utility boiler are duplicated in the BSF including the lower furnace, the ash hopper, multiple burner elevations, the arch section, superheater/reheater panels, and the convective heat transfer surfaces. The furnace walls and heat transfer surfaces are cooled by a surrounding water jacket. Steam generated is vented off at atmospheric pressure so that a constant sink temperature of 100{degrees}C (212{degrees}C) is maintained. The lower furnace water walls are selectively refractory lined to maintain an appropriate furnace gas temperature history. Refractory is required because the sink temperature (100{degrees}C) is cooler than that of a typical, utility boiler, and the surface-to-volume ratio of the BSF is greater than that of a utility boiler due to scale effects. For the subject testing, the BSF will be configured as a coal fired boiler. Design and planning activities associated with the construction of the NO{sub x} control subsystem test unit will continue through June, 1995. Additionally, the schedule for specification of certain low NO{sub x} firing system components was set to allow for precursor, internal and LEBS development activities to occur and subsequently provide necessary design parameters.
Divergence of Lubkin's series for a quantum subsystem's mean entropy
Jacob P Dyer
2014-09-17T23:59:59.000Z
In 1978, Lubkin proposed a method of approximating the mean von Neumann entropy for a subsystem of a finite-dimensional quantum system in an overall pure state by expanding the entropy as a series in terms of the mean trace of powers of the system's reduced density operator, but the convergence of this series was never established. We find an exact closed form expression for the mean traces, which enables us to prove that the series converges if and only if the system's dimension $m\\le2$, in spite of the fact that Lubkin's proposed approximation for the entropy is now known to be correct.
Reactor Subsystem Simulation for Nuclear Hybrid Energy Systems
Shannon Bragg-Sitton; J. Michael Doster; Alan Rominger
2012-09-01T23:59:59.000Z
Preliminary system models have been developed by Idaho National Laboratory researchers and are currently being enhanced to assess integrated system performance given multiple sources (e.g., nuclear + wind) and multiple applications (i.e., electricity + process heat). Initial efforts to integrate a Fortran-based simulation of a small modular reactor (SMR) with the balance of plant model have been completed in FY12. This initial effort takes advantage of an existing SMR model developed at North Carolina State University to provide initial integrated system simulation for a relatively low cost. The SMR subsystem simulation details are discussed in this report.
Acceleration of Radiance for Lighting Simulation by Using Parallel Computing with OpenCL
Zuo, Wangda; McNeil, Andrew; Wetter, Michael; Lee, Eleanor
2011-09-06T23:59:59.000Z
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 experiments show that the combination of the above measures can speed up the annual daylighting simulations 101.7 times or 28.6 times when the sky vector has 146 or 2306 elements, respectively.
Ward, Gregory; Mistrick, Ph.D., Richard; Lee, Eleanor; McNeil, Andrew; Jonsson, Ph.D., Jacob
2011-01-21T23:59:59.000Z
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.
Moffitt, John Russell
1972-01-01T23:59:59.000Z
thickness. Both Rayleigh and isotropic scattering are considered and examples are included for r = 1, m = 1, n = -1, m ' o ' 1 and A = 0. The method is also extended to include non-zero ground albedos and an example is included. A method... scattering for = 1 m = 1 n = -1 and A = 0. The continuous m o 1 10 curve is Matrix Operator Theory result 27 INTROBNCTION 1. Current and Past Methods for Calculating Reflected and Trans- mitted Radiance Early work in calculating the reflected...
Maps and inverse maps in open quantum dynamics
Thomas F. Jordan
2008-07-08T23:59:59.000Z
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.
University of Miami; Zuo, Wangda; McNeil, Andrew; Wetter, Michael; Lee, Eleanor S.
2013-04-30T23:59:59.000Z
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.
Siala, F.M.F. (Center for Solar Energy Studies, Tripoli (Libya)); Hooper, F.C. (Univ. of Toronto, Ontario (Canada))
1990-01-01T23:59:59.000Z
The development of a new, semi-empirical model for the directional distribution of the diffuse radiance is reported. The proposed regression-type model, with the form of its base functions obtained from physical principles, is based on a combination of the purely physical reasoning approach and the purely empirical approach. Direct multiple-scattering calculations are circumvented through the use of the method of successive orders of scattering. The model is calibrated for the mean diffuse radiance estimated under all sky conditions reported in a large and comprehensive diffuse radiance data set. It is found that only a small increase in accuracy is gained by including higher orders of scattering, and this increase does not justify the complexity of the resulting model. Therefore, the single scattering approximation is recommended. The use of the model is illustrated in a typical application, in which the fraction of diffuse radiation intercepted by the receive of a compound parabolic concentrator is computed.
Hawking-Unruh Thermal Radiance as Relativistic Exponential Scaling of Quantum Noise
B. L. Hu
1996-06-26T23:59:59.000Z
The Hawking-Unruh effect of thermal radiance from a black hole or observed by an accelerated detector is usually viewed as a geometric effect related to the existence of an event horizon. Here we propose a new viewpoint, that the detection of thermal radiance in these systems is a local, kinematic effect arising from the vacuum being subjected to a relativistic exponential scale transformation. This kinematic effect alters the relative weight of quantum versus thermal fluctuations (noise) between the two vacua. This approach can treat conditions which the geometric approach cannot, such as systems which do not even have an event horizon. An example is the case of an observer whose acceleration is nonuniform or only asymptotically uniform. Since this approach is based on concepts and techniques of non-equilibrium statistical mechanics, it is more adept to dynamical problems, such as the dissipation, fluctuation, and entropy aspects of particle creation and phase transitions in black hole collapse and in the early universe.
Sheridan, Jennifer
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
Jensen, Henrik Wann
-Time Lighting Design Anders Wang Kristensen UCSD Tomas Akenine-MÂ¨oller Lund University Henrik Wann Jensen UCSD Abstract This paper introduces a new method for real-time relight- ing of scenes illuminated by local light sources. We extend previous work on precomputed radiance transfer for distant lighting to local lighting
A nanoflare model for active region radiance: application of artificial neural networks
M. Bazarghan; H. Safari; D. E. Innes; E. Karami; S. K. Solanki
2008-12-20T23:59:59.000Z
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.
Slanker, Julie Marie
2009-05-15T23:59:59.000Z
Three investigations were conducted on the nature of the radiance field in clear ocean water. It is important to understand the sunlight intensity below the sea surface because this leads to an understanding of how ocean creatures navigate...
Mills, Peter
2012-01-01T23:59:59.000Z
Microwave emissivity models of sea ice are poorly validated empirically. Typical validation studies involve using averaged or stereotyped profiles of ice parameters against averaged radiance measurements. Measurement sites are rarely matched and even less often point-by-point. Because of saline content, complex permittivity of sea ice is highly variable and difficult to predict. Therefore, to check the validity of a typical, plane-parallel, radiative-transfer-based ice emissivity model, we apply it to fresh water ice instead of salt-water ice. Radiance simulations for lake ice are compared with measurements over Lake Superior from the Advanced Microwave Scanning Radiometer on EOS (AMSR-E). AMSR-E measurements are also collected over Antarctic icepack. For each pixel, a thermodynamic model is driven by four years of European Center for Medium Range Weather Forecasts (ECMWF) reanalysis data and the resulting temperature profiles used to drive the emissivity model. The results suggest that the relatively simple ...
Pointwise Fourier Inversion: a Wave Equation Approach
Pointwise Fourier Inversion: a Wave Equation Approach Mark A. Pinsky1 Michael E. Taylor2. A general criterion for pointwise Fourier inversion 2. Pointwise Fourier inversion on Rn (n = 3) 3. Fourier inversion on R2 4. Fourier inversion on Rn (general n) 5. Fourier inversion on spheres 6. Fourier inversion
Nuernberg, Peter John
1994-01-01T23:59:59.000Z
IMPLICATIONS OF AN OPEN, EXTENSIBLE, AND DISTRIBUTED HYPERMEDIA INFORMATION SYSTEM ARCHITECTURE FOR INTERPROCESS COMMUNICATION SUBSYSTEM DESIGN A Thesis by PETER JOHN NUERNBERG Submitted to Texas A&M University in partial fulfillment...: Computer Science ABSTRACT Implications of an Open, Extensible, and Distributed Hypermedia Information System Architecture for Inter-process Communication Subsystem Design. (December 1994) Peter John Nuernberg, B. S. , Texas Ak. M University Chair...
INVERSE PROTEIN FOLDING, HIERARCHICAL OPTIMISATION
Halligan, Daniel
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
7, 1043910465, 2007 Mesoscale inversion
Boyer, Edmond
ACPD 7, 1043910465, 2007 Mesoscale inversion T. Lauvaux et al. Title Page Abstract Introduction Discussions Mesoscale inversion: first results from the CERES campaign with synthetic data T. Lauvaux 1,2 , M.lauvaux@lsce.ipsl.fr) 10439 #12;ACPD 7, 1043910465, 2007 Mesoscale inversion T. Lauvaux et al. Title Page Abstract
Robust inversion, dimensionality reduction, and randomized sampling
Aleksandr Aravkin
2011-11-17T23:59:59.000Z
Nov 17, 2011 ... Keywords: inverse problems, seismic inversion, stochastic optimization, robust estimation. Category 1: Nonlinear Optimization. Category 2: ...
Stochastic Joint Inversion for Integrated Data Interpretation...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Stochastic Joint Inversion for Integrated Data Interpretation in Geothermal Exploration Stochastic Joint Inversion for Integrated Data Interpretation in Geothermal Exploration...
Pointwise Fourier Inversion: a Wave Equation Approach
Pointwise Fourier Inversion: a Wave Equation Approach Mark A. Pinsky 1 Michael E. Taylor 2. A general criterion for pointwise Fourier inversion 2. Pointwise Fourier inversion on R n (n = 3) 3. Fourier inversion on R 2 4. Fourier inversion on R n (general n) 5. Fourier inversion on spheres 6. Fourier
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItem NotEnergy,ARMForms About Batteriesmetal-organic frameworks EFRC 1001 wordInverse
Andrew Beckwith
2014-04-15T23:59:59.000Z
Use of super-radiance in BH physics, so dE/dt past the planet Mercury.The present document makes a given differentiation between super-radiance in the case of conventional BHs and Braneworld BH super-radiance, which may delineate if Braneworlds contribute to an admissible massive graviton in terms of removing the usual problem of the 3/4th the bending of light past the planet Mercury which is normally associated with massive gravitons. This leads to a fork in the road, between two 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.
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
The AERI instrument is an advanced version of the high spectral resolution interferometer sounder (HIS) designed and fabricated at the University of Wisconsin (Revercomb et al. 1988) to measure upwelling infrared radiances from an aircraft. The AERI is a fully automated ground-based passive infrared interferometer that measures downwelling atmospheric radiance from 3.3 - 18.2 mm (550 - 3000 cm-1) at less than 10-minute temporal resolution with a spectral resolution of one wavenumber. It has been used in DOEÆs Atmospheric Radiation Measurement (ARM) program. Much of the data available here at the Cooperative Institute for Meteorological Satellite Studies (CIMSS), an institute within the University of Wisconsin’s Space Science and Engineering Center, may also be available in the ARM Archive. On this website, data and images from six different field experiments are available, along with AERIPLUS realtime data for the Madison, Wisconsin location. Realtime data includes temperature and water vapor time-height cross sections, SKEWT diagrams, convective stability indices, and displays from a rooftop Lidar instrument. The field experiments took place in Oaklahoma and Wisconsin with the AERI prototype.
Inverse problem for Bremsstrahlung radiation
Voss, K.E.; Fisch, N.J.
1991-10-01T23:59:59.000Z
For certain predominantly one-dimensional distribution functions, an analytic inversion has been found which yields the velocity distribution of superthermal electrons given their Bremsstrahlung radiation. 5 refs.
Inverse Problems in Transport Theory
The inverse scattering problem for (2.1) is the following: Does S determine ...... J. Voigt, Spectral properties of the neutron transport equation, J. Math. Anal. Appl.
de Weck, Olivier L.
Integration of System-Level Optimization with Concurrent Engineering Using Parametric Subsystem Students #12;2 #12;Integration of System-Level Optimization with Concurrent Engineering Using Parametric concurrent engineering use. In some ways concurrent engineering and automated system-level optimization
JETC: Joint Energy Thermal and Cooling Management for Memory and CPU Subsystems in Servers
Simunic, Tajana
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
Integrated thermal and nonthermal treatment technology and subsystem cost sensitivity analysis
Harvego, L.A.; Schafer, J.J.
1997-02-01T23:59:59.000Z
The U.S. Department of Energy`s (DOE) Environmental Management Office of Science and Technology (EM-50) authorized studies on alternative systems for treating contact-handled DOE mixed low-level radioactive waste (MLLW). The on-going Integrated Thermal Treatment Systems` (ITTS) and the Integrated Nonthermal Treatment Systems` (INTS) studies satisfy this request. EM-50 further authorized supporting studies including this technology and subsystem cost sensitivity analysis. This analysis identifies areas where technology development could have the greatest impact on total life cycle system costs. These areas are determined by evaluating the sensitivity of system life cycle costs relative to changes in life cycle component or phase costs, subsystem costs, contingency allowance, facility capacity, operating life, and disposal costs. For all treatment systems, the most cost sensitive life cycle phase is the operations and maintenance phase and the most cost sensitive subsystem is the receiving and inspection/preparation subsystem. These conclusions were unchanged when the sensitivity analysis was repeated on a present value basis. Opportunity exists for technology development to reduce waste receiving and inspection/preparation costs by effectively minimizing labor costs, the major cost driver, within the maintenance and operations phase of the life cycle.
Modeling the pneumatic subsystem of a S-cam air brake system
Coimbatore Subramanian, Shankar
2004-09-30T23:59:59.000Z
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...
Lott, D.F.
1980-12-01T23:59:59.000Z
Electronics systems supporting the development of biofouling countermeasures for Ocean Thermal Energy Conversion (OTEC) are described. Discussed are the thermistor/thermopile amplifiers, heaters, flowmeters, temperature measurement, control systems for chlorination, flow driven brushes, and recirculating sponge rubber balls. The operation and troubleshooting of each electronic subsystem is documented.
Paris-Sud XI, Université de
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
Report on Wind Turbine Subsystem Reliability - A Survey of Various Databases (Presentation)
Sheng, S.
2013-07-01T23:59:59.000Z
Wind industry has been challenged by premature subsystem/component failures. Various reliability data collection efforts have demonstrated their values in supporting wind turbine reliability and availability research & development and industrial activities. However, most information on these data collection efforts are scattered and not in a centralized place. With the objective of getting updated reliability statistics of wind turbines and/or subsystems so as to benefit future wind reliability and availability activities, this report is put together based on a survey of various reliability databases that are accessible directly or indirectly by NREL. For each database, whenever feasible, a brief description summarizing database population, life span, and data collected is given along with its features & status. Then selective results deemed beneficial to the industry and generated based on the database are highlighted. This report concludes with several observations obtained throughout the survey and several reliability data collection opportunities in the future.
Exchange-Only Dynamical Decoupling in the 3-Qubit Decoherence Free Subsystem
West, Jacob R
2012-01-01T23:59:59.000Z
The Uhrig dynamical decoupling sequence achieves high-order decoupling of a single system qubit from its dephasing bath through the use of bang-bang Pauli pulses at appropriately timed intervals. High-order decoupling of single and multiple qubit systems from baths causing both dephasing and relaxation can also be achieved through the nested application of Uhrig sequences, again using single-qubit Pauli pulses. For the 3-qubit decoherence free subsystem (DFS) and related subsystem encodings, Pauli pulses are not naturally available operations; instead, exchange interactions provide all required encoded operations. Here we demonstrate that exchange interactions alone can achieve high-order decoupling against general noise in the 3-qubit DFS. We present decoupling sequences for a 3-qubit DFS coupled to classical and quantum baths and evaluate the performance of the sequences through numerical simulations.
Exchange-Only Dynamical Decoupling in the 3-Qubit Decoherence Free Subsystem
Jacob R. West; Bryan H. Fong
2012-03-20T23:59:59.000Z
The Uhrig dynamical decoupling sequence achieves high-order decoupling of a single system qubit from its dephasing bath through the use of bang-bang Pauli pulses at appropriately timed intervals. High-order decoupling of single and multiple qubit systems from baths causing both dephasing and relaxation can also be achieved through the nested application of Uhrig sequences, again using single-qubit Pauli pulses. For the 3-qubit decoherence free subsystem (DFS) and related subsystem encodings, Pauli pulses are not naturally available operations; instead, exchange interactions provide all required encoded operations. Here we demonstrate that exchange interactions alone can achieve high-order decoupling against general noise in the 3-qubit DFS. We present decoupling sequences for a 3-qubit DFS coupled to classical and quantum baths and evaluate the performance of the sequences through numerical simulations.
Entanglement between two subsystems, the Wigner semicircle and extreme value statistics
Udaysinh T. Bhosale; Steven Tomsovic; Arul Lakshminarayan
2012-06-16T23:59:59.000Z
The entanglement between two arbitrary subsystems of random pure states is studied via properties of the density matrix's partial transpose, $\\rho_{12}^{T_2}$. The density of states of $\\rho_{12}^{T_2}$ is close to the semicircle law when both subsystems have dimensions which are not too small and are of the same order. A simple random matrix model for the partial transpose is found to capture the entanglement properties well, including a transition across a critical dimension. Log-negativity is used to quantify entanglement between subsystems and analytic formulas for this are derived based on the simple model. The skewness of the eigenvalue density of $\\rho_{12}^{T_2}$ is derived analytically, using the average of the third moment over the ensemble of random pure states. The third moment after partial transpose is also shown to be related to a generalization of the Kempe invariant. The smallest eigenvalue after partial transpose is found to follow the extreme value statistics of random matrices, namely the Tracy-Widom distribution. This distribution, with relevant parameters obtained from the model, is found to be useful in calculating the fraction of entangled states at critical dimensions. These results are tested in a quantum dynamical system of three coupled standard maps, where one finds that if the parameters represent a strongly chaotic system, the results are close to those of random states, although there are some systematic deviations at critical dimensions.
Inversion of the star transform
Fan Zhao; John C. Schotland; Vadim A. Markel
2014-05-06T23:59:59.000Z
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.
Fractional Inversion in Krylov Space
B. Bunk
1998-05-28T23:59:59.000Z
The fractional inverse $M^{-\\gamma}$ (real $\\gamma >0$) of a matrix $M$ is expanded in a series of Gegenbauer polynomials. If the spectrum of $M$ is confined to an ellipse not including the origin, convergence is exponential, with the same rate as for Chebyshev inversion. The approximants can be improved recursively and lead to an iterative solver for $M^\\gamma x = b$ in Krylov space. In case of $\\gamma = 1/2$, the expansion is in terms of Legendre polynomials, and rigorous bounds for the truncation error are derived.
Bowyer, J.M.
1984-04-15T23:59:59.000Z
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.
Solovyeva, Alisa [Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden (Netherlands); Technical University Braunschweig, Institute for Physical and Theoretical Chemistry, Hans-Sommer-Str. 10, 38106 Braunschweig (Germany); Pavanello, Michele [Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden (Netherlands); Neugebauer, Johannes [Technical University Braunschweig, Institute for Physical and Theoretical Chemistry, Hans-Sommer-Str. 10, 38106 Braunschweig (Germany)
2012-05-21T23:59:59.000Z
Subsystem density-functional theory (DFT) is a powerful and efficient alternative to Kohn-Sham DFT for large systems composed of several weakly interacting subunits. Here, we provide a systematic investigation of the spin-density distributions obtained in subsystem DFT calculations for radicals in explicit environments. This includes a small radical in a solvent shell, a {pi}-stacked guanine-thymine radical cation, and a benchmark application to a model for the special pair radical cation, which is a dimer of bacteriochlorophyll pigments, from the photosynthetic reaction center of purple bacteria. We investigate the differences in the spin densities resulting from subsystem DFT and Kohn-Sham DFT calculations. In these comparisons, we focus on the problem of overdelocalization of spin densities due to the self-interaction error in DFT. It is demonstrated that subsystem DFT can reduce this problem, while it still allows to describe spin-polarization effects crossing the boundaries of the subsystems. In practical calculations of spin densities for radicals in a given environment, it may thus be a pragmatic alternative to Kohn-Sham DFT calculations. In our calculation on the special pair radical cation, we show that the coordinating histidine residues reduce the spin-density asymmetry between the two halves of this system, while inclusion of a larger binding pocket model increases this asymmetry. The unidirectional energy transfer in photosynthetic reaction centers is related to the asymmetry introduced by the protein environment.
Inverse Temperature-Dependent Pathway of Cellulose Decrystallization...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Inverse Temperature-Dependent Pathway of Cellulose Decrystallization in Trifluoroacetic Acid. Inverse Temperature-Dependent Pathway of Cellulose Decrystallization in...
Center for Inverse Design: About the Center for Inverse Design
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItem NotEnergy,ARMForms About Batteriesmetal-organic frameworks EFRC 1001 wordInverse
A study of generalized inverses
McKinney, Nancy Lee
1973-01-01T23:59:59.000Z
APPENDIX A A FORTRAN IV COMPUTER PROGRAM FOR CALCULATING THE GENERALIZED INVERSE OF A MATRIX. VITA PAGE 17 17 23 32 35 38 38 46 53 53 53 59 65 68 71 92 LIST OF FIGURES FIGURE 1 Least-Square Solution. . 2 Specific Least... are as follows. We extend the definition of a diagonaL matrix to all mxn matrices. We call an mxn matrix D a diagonal matrix of d. = 0 ij for i P j, i = l, . . . , m and j = l, . . . , n. Thus the only entries in D that may be nonzero are the d, i = I...
High dimensional linear inverse modelling
Cooper, Fenwick C
2015-01-01T23:59:59.000Z
We introduce and demonstrate two linear inverse modelling methods for systems of stochastic ODE's with accuracy that is independent of the dimensionality (number of elements) of the state vector representing the system in question. Truncation of the state space is not required. Instead we rely on the principle that perturbations decay with distance or the fact that for many systems, the state of each data point is only determined at an instant by itself and its neighbours. We further show that all necessary calculations, as well as numerical integration of the resulting linear stochastic system, require computational time and memory proportional to the dimensionality of the state vector.
Inverse operator representations of quantum phase
G. M. Saxena
2008-03-14T23:59:59.000Z
We define quantum phase in terms of inverses of annihilation and creation operators. We show that like Susskind - Glogower phase operators, the measured phase operators and the unitary phase operators can be defined in terms of the inverse operators. However, for the unitary phase operator the Hilbert space includes the negative energy states. The quantum phase in inverse operator representation may find the applications in the field of quantum optics particularly in the squeezed states.
Linear conic optimization for inverse optimal control
Edouard Pauwels
2014-11-05T23:59:59.000Z
Nov 5, 2014 ... Abstract: We address the inverse problem of Lagrangian identification based on trajectories in the context of nonlinear optimal control.
INVERSE SCATTERING OF SEISMIC DATA WITH THE ...
1910-61-22T23:59:59.000Z
We discuss the inverse scattering of seismic reflection data making use of the generalized Radon transform. Through an extension, the relevant transform attains ...
Inverse hydrochemical models of aqueous extracts tests
Zheng, L.
2010-01-01T23:59:59.000Z
Samper, J. , Yang, C. , Montenegro, L. , 2003. Users ManualSamper, J. , Vázquez, A. , Montenegro, L. , 2005. Inverse563. Samper, J. , Zhang, G. , Montenegro, L. , 2006. Coupled
Fast methods for inverse wave scattering problems
Lee, Jung Hoon, Ph. D. Massachusetts Institute of Technology
2008-01-01T23:59:59.000Z
Inverse wave scattering problems arise in many applications including computerized/diffraction tomography, seismology, diffraction/holographic grating design, object identification from radar singals, and semiconductor ...
A typology of Bantu subject inversion
Marten, Lutz; van der Wal, Jenneke
2015-01-01T23:59:59.000Z
generalisations are drawn. For example, languages with instrument inversion or with patient inversion always have locative inversion (but not vice versa), or if a language has at least one inversion construction, it always has at least either default agreement... ): (36) Se-tulo seo ba-sadi ba-se-rek-ile-ng kajeno … [Sesotho] 7-chair REL7 2-woman SM2-OM7-buy-PRF-REL today ‘The chair which the women bought today …’ (37) Mbatya dza-va-ka-son-er-a va-kadzi [Shona] 10.clothes REL10-SM2...
NGNP – Creating Validated TRL and TDRMs for Critical Systems, Subsystems, and Components
John W. Collins; John M. Beck; Emmanuel O. Opare; Layne F. Pincock
2008-09-01T23:59:59.000Z
This report introduces two draft Next Generation Nuclear Plant (NGNP) Technology Development Roadmaps (TDRMs) and documents the methods used to create them. As such, this report depicts the development of the hardware needed to successfully operate the NGNP and identifies this hardware by the area of the plant it supports and by system, subsystem, and component (SSC). Several options exist for which technologies are selected to fulfill the functions of the NGNP. These options are represented by differing SSCs and are grouped into reference designs. Each SSC associated with each reference design is evaluated, rated, and assigned a technology readiness level (TRL). A rollup of the TRLs allows for comparison of the various reference designs. A TDRM then documents the tasks needed to obtain information in key discriminating criteria to support technology down selection and the tasks and test required to sufficiently mature the technology and reduce the likelihood of technological failure upon installation. This report presents the path forward, methods, and tools used to understand the requirements, manage the uncertainty, and mitigate the risk for the NGNP project. The key tool, TDRMs, is the means to facilitate NGNP risk-informed decision making, technology down selection, and technology qualification and maturation while serving to coordinate engineering, research and development, and licensing efforts.
Summarizing and Mining Inverse Distributions on Data Streams via Dynamic Inverse Sampling
Cormode, Graham
Summarizing and Mining Inverse Distributions on Data Streams via Dynamic Inverse Sampling Graham data stream management systems approach this problem by sum- marizing and mining the distributions for summariz- ing and mining inverse distributions of data streams: they rely on a novel technique to maintain
Positive and inverse isotope effect on superconductivity
Tian De Cao
2009-09-04T23:59:59.000Z
This article improves the BCS theory to include the inverse isotope effect on superconductivity. An affective model can be deduced from the model including electron-phonon interactions, and the phonon-induced attraction is simply and clearly explained on the electron Green function. The focus of this work is on how the positive or inverse isotope effect occurs in superconductors.
Reservoir Characterization Using Intelligent Seismic Inversion
Mohaghegh, Shahab
reservoir performance. Field Development #12;- Issues about the data and problems regarding data analysis characterization studies. - Inverse modeling of reservoir properties from the seismic data is known as seismic inversion. SEISMIC LOGS #12;1. Does a relationship exist between seismic data and reservoir characteristics
Kempel, P.; Hands, J.
1996-08-19T23:59:59.000Z
This Subsystem Design Requirements (SSDR) document establishes the performance, design, and verification requirements for the conventional building systems and subsystems of the Laser and Target Area Building (LTAB), including those that house and support the operation of high-energy laser equipment and the operational flow of personnel and materials throughout the facility. This SSDR addresses the following subsystems associated with the LTAB: Building structural systems for the Target Bay, Switchyards, Diagnostic Building, Decontamination Area, Laser Bays, Capacitor Bays and Operations Support Area, and the necessary space associated with building-support equipment; Architectural building features associated with housing the space and with the operational cleanliness of the functional operation of the facilities; Heating, Ventilating, and Air Conditioning (HVAC) systems for maintaining a clean and thermally stable ambient environment within the facilities; Plumbing systems that provide potable water and sanitary facilities for the occupants, plus stormwater drainage for transporting rainwater; Fire Protection systems that guard against fire damage to the facilities and their contents; Material handling systems for transporting personnel and heavy materials within the building areas; Mechanical process piping systems for liquids and gases that provide cooling and other service to experimental laser equipment and components; Electrical power and grounding systems that provide service and standby power to building and experimental equipment, including lighting distribution and communications systems for the facilities; Instrumentation and control systems that ensure the safe operation of conventional facilities systems, such as those listed above. Detailed requirements for building subsystems that are not addressed in this document (such as specific sizes, locations, or capacities) are included in detail-level NIP Project Interface Control Documents (ICDS).
Interactive Computer-Enhanced Remote Viewing System (ICERVS): Subsystem design report - Phase 2
Smith, D.A.
1994-04-22T23:59:59.000Z
This ICERVS Phase II Subsystem Design Report describes the detailed software design of the Phase II Interactive Computer-Enhanced Remote Viewing System (ICERVS). ICERVS is a computer-based system that provides data acquisition, data visualization, data analysis, and model synthesis to support robotic remediation of hazardous environments. Due to the risks associated with hazardous environments, remediation must be conducted remotely using robotic systems, which, in turn, must rely on 3D models of their workspace to support both task and path planning with collision avoidance. Tools such as ICERVS are vital to accomplish remediation tasks in a safe, efficient manner. The 3D models used by robotic systems are based on solid modeling methods, in which objects are represented by enclosing surfaces (polygons, quadric surfaces, patches, etc.) or collections of primitive solids (cubes, cylinders, etc.). In general, these 3D models must be created and/or verified by actual measurements made in the robotics workspace. However, measurement data is empirical in nature, with typical output being a collection of xyz triplets that represent sample points on some surface(s) in the workspace. As such, empirical data cannot be readily analyzed in terms of geometric representations used in robotic workspace models. The primary objective of ICERVS is to provide a reliable description of a workspace based on dimensional measurement data and to convert that description into 3D models that can be used by robotic systems. ICERVS will thus serve as a critical factor to allow robotic remediation tasks to be performed more effectively (faster, safer) and economically than with present systems.
High-temperature turbine technology program. Turbine subsystem design report: Low-Btu gas
Horner, M.W.
1980-12-01T23:59:59.000Z
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.
acoustic impedance inversion: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Topic Index 1 ACOUSTIC IMPEDANCE INVERSION FOR STATIC AND DYNAMIC CHARACTERIZATION OF A CO2 EOR PROJECT, Fossil Fuels Websites Summary: ACOUSTIC IMPEDANCE INVERSION FOR STATIC...
Local Uniqueness for the Fixed Energy Fixed Angle Inverse Problem ...
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 ...
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....
Krishtal, Alisa; Genova, Alessandro; Pavanello, Michele
2015-01-01T23:59:59.000Z
Subsystem Density-Functional Theory (DFT) is an emerging technique for calculating the electronic structure of complex molecular and condensed phase systems. In this topical review, we focus on some recent advances in this field related to the computation of condensed phase systems, their excited states, and the evaluation of many-body interactions between the subsystems. As subsystem DFT is in principle an exact theory, any advance in this field can have a dual role. One is the possible applicability of a resulting method in practical calculations. The other is the possibility of shedding light on some quantum-mechanical phenomenon which is more easily treated by subdividing a supersystem into subsystems. An example of the latter is many-body interactions. In the discussion, we present some recent work from our research group as well as some new results, casting them in the current state-of-the-art in this review as comprehensively as possible.
Self-Inverse Interleavers for Turbo Codes
Sakzad, Amin; Panario, Daniel; Eshghi, Nasim
2010-01-01T23:59:59.000Z
In this work we introduce and study a set of new interleavers based on permutation polynomials and functions with known inverses over a finite field $\\mathbb{F}_q$ for using in turbo code structures. We use Monomial, Dickson, M\\"{o}bius and R\\'edei functions in order to get new interleavers. In addition we employ Skolem sequences in order to find new interleavers with known cycle structure. As a byproduct we give an exact formula for the inverse of every R\\'edei function. The cycle structure of R\\'edei functions are also investigated. Finally, self-inverse versions of permutation functions are used to construct interleavers. These interleavers are their own de-interleavers and are useful for turbo coding and turbo decoding. Experiments carried out for self-inverse interleavers constructed using these kind of permutation polynomials and functions show excellent agreement with our theoretical results.
Inverse problem for incremental synchrotron radiation
Fisch, N.J.
1987-06-01T23:59:59.000Z
Significantly more information is available from synchrotron emission from a plasma when the plasma is purposefully disturbed. An inverse problem, to deduce properties of the disturbance given time-dependent radiation data, is proposed. The fast time response of radiation detectors is fully exploited by this approach. A special case of interest, perpendicular observation of a steady-state plasma, lends itself to an analytic inversion.
A fluorophosphate-based inverse Keggin structure
Fielden, John; Quasdorf, Kyle; Cronin, Leroy; Kogerler, Paul
2012-07-17T23:59:59.000Z
An unusual PFO(3)(2-)-templated "inverse Keggin" polyanion, [Mo(12)O(46)(PF)(4)](4-), has been isolated from the degradation reaction of an {Mo(132)}-type Keplerate to [PMo(12)O(40)](3-) by [Cu(MeCN)(4)](PF(6)) in acetonitrile. (31)P-NMR studies suggest a structure-directing role for [Cu(MeCN)(4)](+) in the formation of the highly unusual all-inorganic inverse Keggin structure.
INVERSE-SQUARE LAW TESTS 1 TESTS OF THE GRAVITATIONAL
Washington at Seattle, University of - Department of Physics, Electroweak Interaction Research Group
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
Analysis on the Inverse problem Statistical analysis of the inverse problem
regression This is a non-linear regression model. Assumption : we have equal variance measurement errors and trigonometric forms. #12;Analysis on the Inverse problem Introduction Non-linear regression This is a non-linear on the Inverse problem Introduction Linear and non-linear regression Examples : Linear model y = 0 + 1x + 2x2 y
Maslenikov, O.R.; Johnson, J.J.; Tiong, L.W.; Mraz, M.J.; Bumpus, S.; Gerhard, M.A.
1985-03-01T23:59:59.000Z
The SMACS (Seismic Methodology Analysis Chain with Statistics) system of computer programs, one of the major computational tools of the Seismic Safety Margins Research Program (SSMRP), links the seismic input with the calculation of soil-structure interaction, major structure response, and subsystem response. The seismic input is defined by ensembles of acceleration time histories in three orthogonal directions. Soil-structure interaction and detailed structural response are then determined simultaneously, using the substructure approach to SSI as implemented in the CLASSI family of computer programs. The modus operandi of SMACS is to perform repeated deterministic analyses, each analysis simulating an earthquake occurrence. Parameter values for each simulation are sampled from assumed probability distributions according to a Latin hypercube experimental design. The user may specify values of the coefficients of variation (COV) for the distributions of the input variables. At the heart of the SMACS system is the computer program SMAX, which performs the repeated SSI response calculations for major structure and subsystem response. This report describes SMAX and the pre- and post-processor codes, used in conjunction with it, that comprise the SMACS system. (ACR)
Inversions in astronomy and the SOLA method
F. P. Pijpers
1995-06-14T23:59:59.000Z
This paper was presented at the Institute for Mathematics and its Applications workshop "Inverse problems in wave propagation" and will appear in the series IMA volumes (Springer). A brief overview of applications of inversions within astronomy is presented and also an inventory of techniques commonly in use. Most of this paper is focussed on the method of Subtractive Optimally Localized Averages (SOLA) which is an adaptation of the Backus and Gilbert method. This method was originally developed for use in helioseismology where the Backus and Gilbert method is computationally too slow. Since then it has also been applied to the problem of reverberation mapping of active galactic nuclei and the differences between this inverse problem and the ones of helioseismology are also discussed.
Error handling strategies in multiphase inverse modeling
Finsterle, S.; Zhang, Y.
2010-12-01T23:59:59.000Z
Parameter estimation by inverse modeling involves the repeated evaluation of a function of residuals. These residuals represent both errors in the model and errors in the data. In practical applications of inverse modeling of multiphase flow and transport, the error structure of the final residuals often significantly deviates from the statistical assumptions that underlie standard maximum likelihood estimation using the least-squares method. Large random or systematic errors are likely to lead to convergence problems, biased parameter estimates, misleading uncertainty measures, or poor predictive capabilities of the calibrated model. The multiphase inverse modeling code iTOUGH2 supports strategies that identify and mitigate the impact of systematic or non-normal error structures. We discuss these approaches and provide an overview of the error handling features implemented in iTOUGH2.
D. Jui-Yuan Chiu
2010-10-19T23:59:59.000Z
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 Ã?Â¢Ã?Â?Ã?Â?solar-backgroundÃ?Â¢Ã?Â?Ã?Â 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 ARMÃ?Â¢Ã?Â?Ã?Â?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 SWSÃ?Â¢Ã?Â?Ã?Â? 1 Hz sampling to study the Ã?Â¢Ã?Â?Ã?Â?twilight zoneÃ?Â¢Ã?Â?Ã?Â around clouds where strong aerosol-cloud interactions are taking place. Part Three involves continuing our cloud optical depth and cloud fraction retrieval research with ARMÃ?Â¢Ã?Â?Ã?Â?s 2NFOV instrument by, first, analyzing its data from the AMF-COPS/CLOWD deployment, and second, making our algorithms part of ARMÃ?Â¢Ã?Â?Ã?Â?s operational data processing.
Dynamic Behavior of Multiple Inversions Senior Thesis
Popovic, Jovan
Dynamic Behavior of Multiple Inversions Ilya Baran Senior Thesis Boston University Academy Under functions. To iterate a function means to compose it with itself multiple times. Unless stated otherwise, we a circle centered at O with radius r is a point A 0 on the ray \\Gamma! OA such that OA r = r OA 0 (see
2, 413445, 2008 Surface inversion on
Boyer, Edmond
variations in surface flow velocity and topography along a flow line on ice streams and ice sheets of spatial variations in basal topography and basal slipperiness on surface data can be accurately separatedTCD 2, 413445, 2008 Surface inversion on ice streams G. H. Gudmundsson and M. Raymond Title Page
Wavelet Decomposition Approaches to Statistical Inverse Problems
Abramovich, Felix
Wavelet Decomposition Approaches to Statistical Inverse Problems BY F. ABRAMOVICH Department alternative is the waveletÂvaguelette decomposition method, based on the expansion of the unknown in wavelet series. In the vagueletteÂwavelet decomposition method proposed here, the observed data are expanded
INVERSION FOR APPLIED GEOPHYSICS: A TUTORIAL
Oldenburg, Douglas W.
INVERSION FOR APPLIED GEOPHYSICS: A TUTORIAL Douglas W. Oldenburg* and Yaoguo Li** * UBC-Geophysical, V6T 1Z4 ** Department of Geophysics, Colorado School of Mines, Golden, Colorado, 80401 INTRODUCTION Throughout this book there are numerous cases where geophysics has been used to help solve practical
Inverse Problems for Fractional Diffusion Equations
Zuo, Lihua
2013-06-21T23:59:59.000Z
and preliminaries in Section 1 and 2, in the third section we consider our first inverse boundary problem. This is where an unknown boundary condition is to be determined from overposed data in a time- fractional diffusion equation. Based upon the fundamental...
Focusing Inversion of Electroencephalography and Magnetoencephalography Data
Utah, University of
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
Approximating Human Reaching Volumes Using Inverse Kinematics
Rodríguez, Inmaculada
of reach: standing reach, which is useful in computer animation where virtual humans have to interact. Introduction Virtual Humans are a valuable medium for gaining knowledge and understanding about the human bodyApproximating Human Reaching Volumes Using Inverse Kinematics I. Rodrígueza , M. Peinadoa , R
Global optimization in inverse problem of scatterometry
Paris-Sud XI, UniversitÃ© de
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
Inverse Modeling for Coastal Seawater Intrusion
PolitÃ¨cnica de Catalunya, Universitat
, USA) #12;INTRODUCTION Â· Inverse modeling Â standard tool for groundwater modeling Â uncommonD3D.1 Â 2D and 3D finite-element code for simulating variable-density groundwater problems Â· UCODE 3 and given time (i.e. at one observation location) on one of the parameters in the groundwater model
Inverse modeling of partitioning interwell tracer tests: A streamline approach
Datta-Gupta, Akhil
computations, inverse modeling 1. Introduction [2] It is recognized that the presence of nonaqueous phaseInverse modeling of partitioning interwell tracer tests: A streamline approach Akhil Datta orders of magnitude. INDEX TERMS: 1832 Hydrology: Groundwater transport; 1829 Hydrology: Groundwater
Subject Inversion in French. The Limits of Information Structure
Boyer, Edmond
Marie Lit. the book that has written Marie b. Presentative inversion [pres-inv]: Alors entra un soldat
Fractal Inverse Problem: Approximation Formulation and Differential Methods
GuÃ©rin, Eric
Fractal Inverse Problem: Approximation Formulation and Differential Methods Â´Eric GuÂ´erin1 Introduction 1.1 Fractal Inverse Problem The fractal inverse problem is an important research area with a great number of potential application fields. It consists in finding a fractal model or code that generates
Parallel matrix inversion for the revised simplex method -A study
Hall, Julian
Parallel matrix inversion for the revised simplex method - A study Julian Hall School of Mathematics University of Edinburgh June 15th 2006 Parallel matrix inversion for the revised simplex method - a study #12;Overview · Nature of the challenge of matrix inversion for the revised simplex method #12
Parallel matrix inversion for the revised simplex method -A study
Hall, Julian
Parallel matrix inversion for the revised simplex method - A study Julian Hall School of Mathematics University of Edinburgh June 15th 2006 Parallel matrix inversion for the revised simplex method - a study #12;Overview · Nature of the challenge of matrix inversion for the revised simplex method
Experimental Observation of Femtosecond Electron Beam Microbunching by Inverse
Brookhaven National Laboratory
Experimental Observation of Femtosecond Electron Beam Microbunching by Inverse FreeElectronLaser scale of ß 2.5 ¯m by an Inverse Free Electron Laser (IFEL) accelerator was observed. The optimum Cerenkov accelerator (ICA)[5], inverse free electron laser (IFEL) [6] and plasma laser accelerators [7, 8
LITHOLOGY-FLUID INVERSION FROM PRESTACK SEISMIC DATA
Eidsvik, Jo
LITHOLOGY-FLUID INVERSION FROM PRESTACK SEISMIC DATA MARIT ULVMOEN Department of Mathematical of the study is on lithology-fluid inversion from prestack seismic data in a 3D reservoir. The inversion relates the lithology-fluid classes to elastic variables and the seismic data, and it follows the lines
Equation of state and helioseismic inversions
Sarbani Basu; J. Christensen-Dalsgaard
1997-02-19T23:59:59.000Z
Inversions to determine the squared isothermal sound speed and density within the Sun often use the helium abundance Y as the second parameter. This requires the explicit use of the equation of state (EOS), thus potentially leading to systematic errors in the results if the equations of state of the reference model and the Sun are not the same. We demonstrate how this potential error can be suppressed. We also show that it is possible to invert for the intrinsic difference in the adiabatic exponent Gamma_1 between two equations of state. When applied to solar data such inversion rules out the EFF equation of state completely, while with existing data it is difficult to distinguish between other equations of state.
The Product Form of the Inverse
Ward, Everett Bascomb
1966-01-01T23:59:59.000Z
the equations as follows: 19 s(1) X2 = El A2, or 0 0 1 2 1 1 0 0 0 1 v = Lo, 3, 0], and E (&) 2 1 0 0 0 ? 0 1 3 I 0 0 1 the inverse A2 of the new matrix A2 is computed. as follows: A -1 Es(2)A -1 Es(2)Es(1) 2 2 1 2 1 or ? -1 A2 1 0 0 0 ? 0.... column vector v of the elementary matrix E 3 is given by the equation of (2, 16 i as v = [-l, p, 2j, 1 1 thus Es{3) 3 0 -1 1 1 0 1 2 Therefore, the inverse A of A is computed by the equation -1 of (2. 10) as follows: A-1 = A -1 ? Es( A -1 Es(3...
Regularity of mappings inverse to Sobolev mappings
Vodop'yanov, Sergei K [S.L. Sobolev Institute for Mathematics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk (Russian Federation)
2012-10-31T23:59:59.000Z
For homeomorphisms {phi}:{Omega}{yields}{Omega}' on Euclidean domains in R{sup n}, n{>=}2, necessary and sufficient conditions ensuring that the inverse mapping belongs to a Sobolev class are investigated. The result obtained is used to describe a new two-index scale of homeomorphisms in some Sobolev class such that their inverses also form a two-index scale of mappings, in another Sobolev class. This scale involves quasiconformal mappings and also homeomorphisms in the Sobolev class W{sup 1}{sub n-1} such that rankD{phi}(x){<=}n-2 almost everywhere on the zero set of the Jacobian det D{phi}(x). Bibliography: 65 titles.
Seismic velocity inversion by differential semblance optimization
Gockenbach, M.; Symes, W.; Tapia, R.
1994-12-31T23:59:59.000Z
Differential Semblance Optimization (DSO) is a novel way of approaching certain inverse problems that arise in exploration seismology. The standard method of formulating these inverse problems -- Output Least-Squares (OLS) -- leads to a highly nonconvex objective function and therefore to a global optimization problem. The OLS problem can be rewritten as a partially linear least-squares problem with linear constraints, with the DSO objective function derived from the quadratic penalty function for this problem. It is shown that, because of the nature of the operators in this problem, the penalty function leads to a globalization procedure: for suitably small values of the penalty parameter, the global minimum of the DSO objective function can be found using local optimization techniques. There is then a path of minimizers, parameterized by the penalty constant, leading to the solution of the OLS problem.
Inverse free-electron laser accelerator
Pellegrini, C.; Campisi, R.
1982-01-01T23:59:59.000Z
We first describe the basic physical properties of an inverse free-electron laser and make an estimate of the order of magnitude of the accelerating field obtainable with such a system; then apply the general ideas to the design of an actual device and through this example we give a more accurate evaluation of the fundamental as well as the technical limitations that this acceleration scheme imposes.
Computationally efficient Bayesian inference for inverse problems.
Marzouk, Youssef M.; Najm, Habib N.; Rahn, Larry A.
2007-10-01T23:59:59.000Z
Bayesian statistics provides a foundation for inference from noisy and incomplete data, a natural mechanism for regularization in the form of prior information, and a quantitative assessment of uncertainty in the inferred results. Inverse problems - representing indirect estimation of model parameters, inputs, or structural components - can be fruitfully cast in this framework. Complex and computationally intensive forward models arising in physical applications, however, can render a Bayesian approach prohibitive. This difficulty is compounded by high-dimensional model spaces, as when the unknown is a spatiotemporal field. We present new algorithmic developments for Bayesian inference in this context, showing strong connections with the forward propagation of uncertainty. In particular, we introduce a stochastic spectral formulation that dramatically accelerates the Bayesian solution of inverse problems via rapid evaluation of a surrogate posterior. We also explore dimensionality reduction for the inference of spatiotemporal fields, using truncated spectral representations of Gaussian process priors. These new approaches are demonstrated on scalar transport problems arising in contaminant source inversion and in the inference of inhomogeneous material or transport properties. We also present a Bayesian framework for parameter estimation in stochastic models, where intrinsic stochasticity may be intermingled with observational noise. Evaluation of a likelihood function may not be analytically tractable in these cases, and thus several alternative Markov chain Monte Carlo (MCMC) schemes, operating on the product space of the observations and the parameters, are introduced.
Inverse hydrochemical models of aqueous extracts tests
Zheng, L.; Samper, J.; Montenegro, L.
2008-10-10T23:59:59.000Z
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.
Calgary, University of
Sensor Subsystem for Vehicle Platoon Control M.E. Cannon, C. Basnayake, S. Crawford, S. Syed and G been involved in satellite based navigation R&D since 1980. ABSTRACT Coordination of vehicles in high. The concept of Collaborative Driving Systems (CDS) addresses this issue by linking several vehicles
Kent, B.; Garvey, C.J.; Cookson, D.; Bryant, G.; (Aust.Synch.); (ANSTO); (RMIT)
2009-01-05T23:59:59.000Z
The inverse hexagonal to inverse ribbon phase transition in a mixed phosphatidylcholine-phosphatidylethanolamine system at low hydration is studied using small and wide angle X-ray scattering. It is found that the structural parameters of the inverse hexagonal phase are independent of temperature. By contrast the length of each ribbon of the inverse ribbon phase increases continuously with decreasing temperature over a range of 50 C. At low temperatures the inverse ribbon phase is observed to have a transition to a gel lamellar phase, with no intermediate fluid lamellar phase. This phase transition is confirmed by differential scanning calorimetry.
ARM - Measurement - Longwave narrowband radiance
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDC
ARM - Measurement - Longwave spectral radiance
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwelling irradiance ARM Data Discovery Browsespectral
ARM - Measurement - Shortwave broadband radiance
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarization ARMdownwelling
ARM - Measurement - Shortwave narrowband radiance
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarizationupwelling irradiance
ARM - Measurement - Shortwave spectral radiance
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarizationupwellingdiffuse
Radiance Solar | Open Energy Information
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Center for Inverse Design: Staff Biographies
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWPSuccess StoriesFebruaryMetalControlInverse Design Organization
Importance of Elevation and Temperature Inversions for the Interpretat...
Importance of Elevation and Temperature Inversions for the Interpretation of Thermal Infrared Satellite Images Used in Geothermal Exploration Jump to: navigation, search OpenEI...
Advanced Imaging and Ultra-fast Material Probing With Inverse...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Imaging and Ultra-fast Material Probing With Inverse Compton Scattering A proposal to the Brookhaven Accelerator Test Facility Gerard Andonian, Alberto Bacci, Ubaldo...
A Target-Oriented Magnetotelluric Inversion Approach For Characterizin...
to establish an in situ laboratory to investigate the potential for geothermal energy production. Classical 2-D smooth inversion of the MT data, recorded along two profiles,...
High Gradient Inverse Free Electron Laser (IFEL) Accelerator
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Gradient High energy gain Inverse Free Electron Laser P. Musumeci UCLA Department of Physics and Astronomy On Behalf of the RUBICON collaboration ATF user meeting, BNL, October 6...
Three-Dimensional Inversion of Magnetotelluric Data on a PC,...
Coso Geothermal Field Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings: Three-Dimensional Inversion of Magnetotelluric Data on a PC,...
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...
Potential inversion with subbarrier fusion data revisited
K. Hagino; Y. Watanabe
2007-06-18T23:59:59.000Z
We invert experimental data for heavy-ion fusion reactions at energies well below the Coulomb barrier in order to directly determine the internucleus potential between the colliding nuclei. In contrast to the previous applications of the inversion formula, we explicitly take into account the effect of channel couplings on fusion reactions, by assuming that fusion cross sections at deep subbarrier energies are governed by the lowest barrier in the barrier distribution. We apply this procedure to the $^{16}$O +$^{144}$Sm and $^{16}$O +$^{208}$Pb reactions, and find that the inverted internucleus potential are much thicker than phenomenological potentials. A relation to the steep fall-off phenomenon of fusion cross sections recently found at deep subbarrier energies is also discussed.
Supersymmetric inversion of effective-range expansions
Bikashkali Midya; Jérémie Evrard; Sylvain Abramowicz; O. L. Ramírez Suárez; Jean-Marc Sparenberg
2015-05-26T23:59:59.000Z
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.
Supersymmetric inversion of effective-range expansions
Midya, Bikashkali; Abramowicz, Sylvain; Suárez, O L Ramírez; Sparenberg, Jean-Marc
2015-01-01T23:59:59.000Z
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.
Supersymmetric inversion of effective-range expansions
Bikashkali Midya; Jérémie Evrard; Sylvain Abramowicz; O. L. Ramírez Suárez; Jean-Marc Sparenberg
2015-01-16T23:59:59.000Z
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.
Inverse Vernier Effects in Coupled Lasers
Ge, Li
2015-01-01T23:59:59.000Z
In this report we study the Vernier effect in coupled laser systems consisting of two cavities. We show that depending on the nature of their coupling, not only can the "supermodes" formed at the overlapping resonances of the coupled cavities have the lowest thresholds and lase first as previously suggested, leading to a manifestation of the typical Vernier effect now in an active system; these supermodes can also have increased thresholds and are hence suppressed, which can be viewed as an inverse Vernier effect. We attribute this effect to detuning-dependent Q-spoiling, and it can lead to an increased free spectrum range and possibly single-mode lasing, which may explain the experimental findings of several previous work. We illustrate this effect using two coupled micro-ring cavities and a micro-ring cavity coupled to a slab cavity, and we discuss its relation to the existence of exceptional points in coupled lasers.
Optical Aharonov-Bohm effect: an inverse hyperbolic problems approach
Gregory Eskin
2007-10-18T23:59:59.000Z
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.
Constrained Inverse Volume Rendering for Planetary Nebulae Marcus Magnor
Utah, University of
Inverse Volume Rendering I.4.m [Image Processing and Computer Vision]: Miscellaneous--Volumetric Modeling that we are observing 2D projections of 3D volumes of glowing gas, the actual spatial struc- ture of PNeConstrained Inverse Volume Rendering for Planetary Nebulae Marcus Magnor MPI Informatik, Germany
Anomalous Phase Inversion in Polymer Blends Prepared by Cryogenic Mechanical
, as well as interpenetrating and bicontinu- ous networks.7,8 Phase inversion occurs when the mi- norityAnomalous Phase Inversion in Polymer Blends Prepared by Cryogenic Mechanical Alloying Archie P strategies for producing highly dis- persed multicomponent polymer blends. By their very nature
Wavelet based inversion of gravity data Fabio Boschetti
Boschetti, Fabio
1 Wavelet based inversion of gravity data Fabio Boschetti CSIRO Exploration & Mining and Australian Running Heading: Wavelet based inversion of gravity data #12;2 ABSTRACT The Green's function of the Poisson equation, and its spatial derivatives, lead to a family of wavelets specifically tailored
Inverse Modelling in Geology by Interactive Evolutionary Computation
Boschetti, Fabio
Inverse Modelling in Geology by Interactive Evolutionary Computation Chris Wijns a,b,, Fabio of geological processes, in the absence of established numerical criteria to act as inversion targets, requires evolutionary computation provides for the inclusion of qualitative geological expertise within a rigorous
Inversed Temperature Dependence Aware Clock Skew Scheduling for Sequential
Kuzmanovic, Aleksandar
Inversed Temperature Dependence Aware Clock Skew Scheduling for Sequential Circuits Jieyi Long}@eecs.northwestern.edu Abstract -- We present an Inversed Temperature Dependence (ITD) aware clock skew scheduling framework, we propose an algorithm for synergistic temperature aware clock skew scheduling and dual
Hyperparameter estimation for uncertainty quantification in mesoscale carbon dioxide inversions
Paris-Sud XI, Université de
Hyperparameter estimation for uncertainty quantification in mesoscale carbon dioxide inversions-validation (GCV) and x2 test are compared for the first time under a realistic setting in a mesoscale CO2 estimation, uncertainty quantification, mesoscale carbon dioxide inversions 1. Introduction The atmosphere
THE FUKUSHIMA INVERSE PROBLEM Marta Martinez-Camara, Ivan Dokmanic,
Vetterli, Martin
THE FUKUSHIMA INVERSE PROBLEM Marta Martinez-Camara, Ivan Dokmani´c, Juri Ranieri, Robin Scheibler material was released from Fukushima in March 2011 is crucial to understand the scope of the consequences regular- ization that solves the Fukushima inverse problem blindly. Together with the atmospheric
Lithology-Fluid Inversion based on Prestack Seismic Data
Eidsvik, Jo
Lithology-Fluid Inversion based on Prestack Seismic Data Marit Ulvmoen Summary The focus of the study is on lithology-fluid inversion from prestack seismic data. The target zone is a 3D reservoir model. The likelihood model relates the lithology-fluid classes to elastic variables and the seismic
Computationally Efficient Regularized Inversion for Highly Parameterized MODFLOW Models
Barrash, Warren
. INTRODUCTION The inverse problem in groundwater modeling is generally ill-posed and non-unique. The typical geological heterogeneity has not been possible in common groundwater modeling practice. The principal reasons-Marquardt methods, and (3) lack of experience within the groundwater modeling community with regularized inversion
Adaptive dynamic inversion of nonlinear systems subjected to control saturation constraints
Tandale, Monish Deepak
2007-09-17T23:59:59.000Z
The adaptive dynamic inversion control methodology uses dynamic inversion to calculate the control, and adaptation to compensate for the errors in the inversion due to model uncertainties. Traditionally, adaptive control assumes full authority...
Inversion of TEM sounding data using the steepest descent and the conjugate gradients methods
Alsabti, Abdallah S
2001-01-01T23:59:59.000Z
In this study, the inversion of TEM sounding is investigated. I solved the over-determined and the under-determined inversion problems using the steepest descent and the conjugate gradients methods. The study depends on results from the inversion...
Sunspot umbra atmosphere from full Stokes inversion
Wenzel, R; Fluri, D M; Arnaud, J; Sainz-Dalda, A
2010-01-01T23:59:59.000Z
Sunspots are prominent manifestations of the solar cycle and provide key constraints for understanding its operation. Also, knowing internal structure of sunspots allows us to gain insights on the energy transport in strong magnetic fields and, thus, on the processes inside the convection zone, where solar magnetic fields are generated and amplified before emerging at the surface on various scales, even during solar minima. In this paper, we present results of a spectropolarimetric analysis of a sunspot observed during the declining phase of the solar cycle 23. By inversion of full Stokes spectra observed in several spectral regions in the optical at the THEMIS facility we infer the height dependence of physical quantities such as the temperature and the magnetic field strength for different sunspot regions. The simultaneous use of atomic (Fe{\\sc i} 5250.2 and 5250.6 \\AA) and highly temperature sensitive molecular (TiO 7055 \\AA and MgH 5200 \\AA) lines allow us to improve a model of the sunspot umbra.
Moho topography beneath the Corinth Rift area (Greece) from inversion of gravity data
Demouchy, Sylvie
Moho topography beneath the Corinth Rift area (Greece) from inversion of gravity data C. Tiberi,1 to Miocene lithospheric instabilities. Key words: boudinage, continental rifts, gravity inversion, Greece
Time-lapse Joint Inversion of Geophysical Data and its Applications...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Time-lapse Joint Inversion of Geophysical Data and its Applications to Geothermal Prospecting Time-lapse Joint Inversion of Geophysical Data and its Applications to Geothermal...
Inverse Cascade Regime in Shell Models of 2-Dimensional Turbulence
Thomas Gilbert; Victor S. L'vov; Anna Pomyalov; Itamar Procaccia
2002-01-13T23:59:59.000Z
We consider shell models that display an inverse energy cascade similar to 2-dimensional turbulence (together with a direct cascade of an enstrophy-like invariant). Previous attempts to construct such models ended negatively, stating that shell models give rise to a "quasi-equilibrium" situation with equipartition of the energy among the shells. We show analytically that the quasi-equilibrium state predicts its own disappearance upon changing the model parameters in favor of the establishment of an inverse cascade regime with K41 scaling. The latter regime is found where predicted, offering a useful model to study inverse cascades.
Three-dimensional geologic structures from inversion of gravity anomalies
Hinson, Charles Alvin
1976-01-01T23:59:59.000Z
. Parameters used were: Zo=7 km, R=l gm/cm , fr=0. 09 km-', fz=0. 125 km iterations=6 and final rms difference was 7. 6 10-4 km. . 42 12 Inversion Model 1. Parameters used were p = 0. 1 gm/cms, zo = 5. 4 km, f& = 0. 045 and fz = 0. 095. Contours... are in kilometers relative to sea level 56 13 Inversion Model 2. Parameters used were p = 0. 1 gm/cm zo = 5. 4 km, fq = 0. 001 and fz = 0. 002. Contours are in kilometers relative to sea level 58 14 Gravity difference between the anomaly produced by Inversion...
Not Available
1982-04-01T23:59:59.000Z
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)
Application of robust and inverse optimization in transportation
Nguyen, Thai Dung
2010-01-01T23:59:59.000Z
We study the use of inverse and robust optimization to address two problems in transportation: finding the travel times and designing a transportation network. We assume that users choose the route selfishly and the flow ...
Mesh Puppetry: Cascading Optimization of Mesh Deformation with Inverse Kinematics
Desbrun, Mathieu
approach builds upon traditional rigging by optimizing skeleton position and vertex weights. Keywords: Mesh deformation, nonlinear optimization, inverse kinematics, geometry processing. 1 Introduction. To allow for more global and complex deforma- tion, many authors proposed to cast mesh deformation
Engineering the initial state in broadband population inversion
Bo Y. Chang; Sheokmin Shin; Ignacio R. Sola
2015-03-03T23:59:59.000Z
Quantum systems with sublevel structures prevent full population inversion from one manifold of sublevels to the other using strong ultrafast resonant pulses. In this work we explain the mechanism by which this population transfer is blocked. We then develop a novel concept of geometric control, assuming full or partial coherent manipulation within the manifolds and show that by preparing specific coherent superpositions in the initial manifold, full population inversion or full population blockade, {\\it i.e} laser-induced transparency, can be achieved. In particular, by parallel population transfer we show how population inversion between the manifolds can be obtained with minimal pulse area. As the number of sublevels increases, population inversion can overcome the pulse area theorem at the expense of full control over the initial manifold of sublevels.
Nonlinear Adaptive Dynamic Inversion Control for Hypersonic Vehicles
Rollins, Elizabeth
2013-09-03T23:59:59.000Z
-of-attack and sideslip angle. To prevent undesirable inlet unstart events, the nonlinear adaptive dynamic inversion control architecture is given the ability to enforce state constraints. Because several phenomena can cause inlet unstarts, the control architecture also...
LINEARIZING NON-LINEAR INVERSE PROBLEMS AND AN ...
to show uniqueness and Hölder stability for the inverse backscattering ...... that if we replace uT by u on the r.h.s. above, we get the “distorted harmonic wave”.
Microsoft PowerPoint - High Gradient Inverse Free Electron Laser...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Hi h G di t Hi h i High Gradient High energy gain Inverse Free Electron Laser at BNL P. Musumeci UCLA Department of Physics and Astronomy ATF user meeting April 2-3 2009 Outline...
Strategies for Spectral Profile Inversion using Artificial Neural Networks
H. Socas-Navarro
2004-10-23T23:59:59.000Z
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.
Modeling and inversion of self-potential data
Minsley, Burke J
2007-01-01T23:59:59.000Z
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 ...
The Focused Inverse Method for Linear Logic Kaustuv Chaudhuri
Chaudhuri, Kaustuv
The Focused Inverse Method for Linear Logic Kaustuv Chaudhuri CMU-CS-06-162 December 4, 2006 Mellon University, or any other entity. Copyright c 2006 Kaustuv Chaudhuri #12;Abstract Linear logic
Inverse Optimization: An Application to the Capacitated Plant Location Problem
Bitran, Gabriel R.
Inverse optimization refers to the fact that each time a Lagrangean derived from a given mathematical programming problem is solved, it produces an optimal solution to some problem with a different right hand side. This ...
Tests of the Gravitational Inverse-Square Law
E. G. Adelberger; B. R. Heckel; A. E. Nelson
2003-07-22T23:59:59.000Z
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.
COLLOQUIUM: Seismic Imaging and Inversion Based on Spectral-Element...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
February 6, 2013, 4:15pm to 5:30pm Colloquia MBG Auditorium COLLOQUIUM: Seismic Imaging and Inversion Based on Spectral-Element and Adjoint Methods Professor Jeroen Tromp Princeton...
Scaling and Inverse Scaling in Anisotropic Bootstrap percolation
Aernout C. D. van Enter
2015-02-03T23:59:59.000Z
In bootstrap percolation it is known that the critical percolation threshold tends to converge slowly to zero with increasing system size, or, inversely, the critical size diverges fast when the percolation probability goes to zero. To obtain higher-order terms (that is, sharp and sharper thresholds) for the percolation threshold in general is a hard question. In the case of two-dimensional anisotropic models, sometimes correction terms can be obtained from inversion in a relatively simple manner.
Ahn, M. H.; Han, D.; Won, H. Y.; Morris, Victor R.
2015-01-01T23:59:59.000Z
For a better utilization of the ground-based microwave radiometer, it is important to detect the cloud presence in the measured data. Here, we introduce a simple and fast cloud detection algorithm by using the optical characteristics of the clouds in the infrared atmospheric window region. The new algorithm utilizes the brightness temperature (Tb) measured by an infrared radiometer installed on top of a microwave radiometer. The two step algorithm consists of a spectral test followed by a temporal test. The measured Tb is first compared with a predicted clear sky Tb obtained by an empirical formula as a function of surface air temperature and water vapor pressure. For the temporal test, the temporal variability of the measured Tb during one minute compares with a dynamic threshold value, representing the variability of the clear sky condition. It is designated as cloud free data only when both the spectral and temporal tests confirm a cloud free data. Overall, most of the thick and uniform clouds are successfully screened out by the spectral test, while the broken and fast-varying clouds are screened out by the temporal test. The algorithm is validated by comparison with the collocated ceilometer data for 6 months, from January 2013 to June 2013. The overall proportion correct is about 88.3% and the probability of detection is 90.8 %, which are comparable with or better than those of previous similar approaches. Two thirds of failures occur when the new algorithm detects clouds while the ceilometer does not detect, resulting in different values of the probability of detection with different cloud base altitude, 93.8, 90.3, and 82.8% for low, mid, and high clouds, respectively. Finally, due to the characteristics of the spectral range, the new algorithm is found to be insensitive to the presence of inversion layers.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Ahn, M.-H.; Han, D.; Won, H. Y.; Morris, V.
2015-01-01T23:59:59.000Z
For better utilization of the ground-based microwave radiometer, it is important to detect the cloud presence in the measured data. Here, we introduce a simple and fast cloud detection algorithm by using the optical characteristics of the clouds in the infrared atmospheric window region. The new algorithm utilizes the brightness temperature (Tb) measured by an infrared radiometer installed on top of a microwave radiometer. The two-step algorithm consists of a spectral test followed by a temporal test. The measured Tb is first compared with a predicted clear-sky Tb obtained by an empirical formula as a function of surface air temperaturemore »and water vapor pressure. For the temporal test, the temporal variability of the measured Tb during one minute compares with a dynamic threshold value, representing the variability of clear-sky conditions. It is designated as cloud-free data only when both the spectral and temporal tests confirm cloud-free data. Overall, most of the thick and uniform clouds are successfully detected by the spectral test, while the broken and fast-varying clouds are detected by the temporal test. The algorithm is validated by comparison with the collocated ceilometer data for six months, from January to June 2013. The overall proportion of correctness is about 88.3% and the probability of detection is 90.8%, which are comparable with or better than those of previous similar approaches. Two thirds of discrepancies occur when the new algorithm detects clouds while the ceilometer does not, resulting in different values of the probability of detection with different cloud-base altitude, 93.8, 90.3, and 82.8% for low, mid, and high clouds, respectively. Finally, due to the characteristics of the spectral range, the new algorithm is found to be insensitive to the presence of inversion layers.« less
Inverse problem for bremsstrahlung radiation K. E. Voss and N. J. Fisch
, an analytic inversion has been found that yields the velocity distribution of superthermal electrons given
Inversion of TEM sounding data using the steepest descent and the conjugate gradients methods
Alsabti, Abdallah S
2001-01-01T23:59:59.000Z
-determined problem, the inversion for layer thicknesses proved to be very reliable. I suggested a strategy to use both inversion types in mapping horizontal layers. The under-determined problem was solved by a regularized inversion. A total of 48 inversion runs...
INVERSE SPECTRAL AND SCATTERING THEORY FOR THE HALF-LINE LEFT DEFINITE
INVERSE SPECTRAL AND SCATTERING THEORY FOR THE HALF-LINE LEFT DEFINITE STURM-LIOUVILLE PROBLEM C will prove some uniqueness results for inverse spec- tral theory and inverse scattering for the left definite is via the inverse spectral theory for the left definite problem, which also is not very well developed
Image Appraisal for 2D and 3D Electromagnetic Inversion
Alumbaugh, D.L.; Newman, G.A.
1999-01-28T23:59:59.000Z
Linearized methods are presented for appraising image resolution and parameter accuracy in images generated with two and three dimensional non-linear electromagnetic inversion schemes. When direct matrix inversion is employed, the model resolution and posterior model covariance matrices can be directly calculated. A method to examine how the horizontal and vertical resolution varies spatially within the electromagnetic property image is developed by examining the columns of the model resolution matrix. Plotting the square root of the diagonal of the model covariance matrix yields an estimate of how errors in the inversion process such as data noise and incorrect a priori assumptions about the imaged model map into parameter error. This type of image is shown to be useful in analyzing spatial variations in the image sensitivity to the data. A method is analyzed for statistically estimating the model covariance matrix when the conjugate gradient method is employed rather than a direct inversion technique (for example in 3D inversion). A method for calculating individual columns of the model resolution matrix using the conjugate gradient method is also developed. Examples of the image analysis techniques are provided on 2D and 3D synthetic cross well EM data sets, as well as a field data set collected at the Lost Hills Oil Field in Central California.
Temperature inversion in long-range interacting systems
Teles, Tarcisio N; Casetti, Lapo
2015-01-01T23:59:59.000Z
Temperature inversions occur in nature, e.g., in the solar corona and in interstellar molecular clouds: somewhat counterintuitively, denser parts of the system are colder than dilute ones. We propose a simple and appealing mechanism to spontaneously generate temperature inversions in systems with long-range interactions, by preparing them in inhomogeneous thermal equilibrium states and then applying an impulsive perturbation. In similar situations, short-range systems would typically relax to another thermal equilibrium, with uniform temperature profile. By contrast, in long-range systems, the interplay between wave-particle interaction and spatial inhomogeneity drives the system to nonequilibrium stationary states that generically exhibit temperature inversion. Our work underlines the crucial role the range of interparticle interaction plays in determining the nature of steady states attained when macroscopic systems are brought out of thermal equilibrium.
Parameterization of geophysical inversion model using particle clustering
Yang, Dikun
2015-01-01T23:59:59.000Z
This paper presents a new method of constructing physical models in a geophysical inverse problem, when there are only a few possible physical property values in the model and they are reasonably known but the geometry of the target is sought. The model consists of a fixed background and many small "particles" as building blocks that float around in the background to resemble the target by clustering. This approach contrasts the conventional geometric inversions requiring the target to be regularly shaped bodies, since here the geometry of the target can be arbitrary and does not need to be known beforehand. Because of the lack of resolution in the data, the particles may not necessarily cluster when recovering compact targets. A model norm, called distribution norm, is introduced to quantify the spread of particles and incorporated into the objective function to encourage further clustering of the particles. As proof of concept, 1D magnetotelluric inversion is used as example. My experiments reveal that the ...
Lepton Number Violation within the Conformal Inverse Seesaw
Humbert, Pascal; Patra, Sudhanwa; Smirnov, Juri
2015-01-01T23:59:59.000Z
We present a novel framework within the conformal inverse seesaw scheme allowing large lepton number violation while the neutrino mass formula is still governed by the low-scale inverse seesaw mechanism. This model includes new contributions to rare low-energy lepton number violating processes like neutrinoless double beta decay. We find that the lifetime for this rare process due to heavy sterile neutrinos can saturate current experimental limits. The characteristic collider signature of the present conformal inverse seesaw scheme includes, same-sign dilepton plus two jets and same-sign dilepton plus four jets. Finally, we comment on the testability of the model at the Large Hadron Collider since there are new scalars, new fermions and an extra neutral gauge boson with masses around few 100 GeV to few TeV.
Sideband generation of transient lasing without population inversion
Luqi Yuan; Da-Wei Wang; Christopher O'Brien; Anatoly A. Svidzinsky; Marlan O. Scully
2014-08-21T23:59:59.000Z
We suggest a method to generate coherent short pulses by generating a frequency comb using lasing without inversion in the transient regime. We use a universal method to study the propagation of a pulse in various spectral regions through an active medium that is strongly driven on a low-frequency transition on a time scale shorter than the decoherence time. The results show gain on the sidebands at different modes can be produced even if there is no initial population inversion prepared. Besides the production of ultra-short pulse this frequency comb may have applications towards making short-wavelength or Tera-hertz lasers.
Goldman, S.P.; Chen, J.Z.; Battista, J.J. [Department of Physics and Astronomy, University of Western Ontario, London, Ontario N6A 3K7 (Canada); Department of Medical Biophysics and Department of Oncology, University of Western Ontario and London Regional Cancer Program, London Health Sciences Centre, London, Ontario N6A 4L6 (Canada)
2005-09-15T23:59:59.000Z
A fast optimization algorithm is very important for inverse planning of intensity modulated radiation therapy (IMRT), and for adaptive radiotherapy of the future. Conventional numerical search algorithms such as the conjugate gradient search, with positive beam weight constraints, generally require numerous iterations and may produce suboptimal dose results due to trapping in local minima. A direct solution of the inverse problem using conventional quadratic objective functions without positive beam constraints is more efficient but will result in unrealistic negative beam weights. We present here a direct solution of the inverse problem that does not yield unphysical negative beam weights. The objective function for the optimization of a large number of beamlets is reformulated such that the optimization problem is reduced to a linear set of equations. The optimal set of intensities is found through a matrix inversion, and negative beamlet intensities are avoided without the need for externally imposed ad-hoc constraints. The method has been demonstrated with a test phantom and a few clinical radiotherapy cases, using primary dose calculations. We achieve highly conformal primary dose distributions with very rapid optimization times. Typical optimization times for a single anatomical slice (two dimensional) (head and neck) using a LAPACK matrix inversion routine in a single processor desktop computer, are: 0.03 s for 500 beamlets; 0.28 s for 1000 beamlets; 3.1 s for 2000 beamlets; and 12 s for 3000 beamlets. Clinical implementation will require the additional time of a one-time precomputation of scattered radiation for all beamlets, but will not impact the optimization speed. In conclusion, the new method provides a fast and robust technique to find a global minimum that yields excellent results for the inverse planning of IMRT.
Mesh Puppetry: Cascading Optimization of Mesh Deformation with Inverse Kinematics
Zhou, Kun
approach builds upon traditional rigging by optimizing skeleton position and vertex weights. Keywords: Mesh deformation, nonlinear optimization, inverse kinematics, geometry processing. 1 Introduction,mathieu}@caltech.edu Figure 1: Armadillo Olympics: The Armadillo model (top left) can be deformed to take various sport poses
Directional Wetting in Anisotropic Inverse Opals Katherine R. Phillips,
Aizenberg, Joanna
the nano- to microscale voids. Here, we investigate how liquid wetting in highly ordered inverse opals template of colloidal particles. This highly ordered structure acts as a photonic crystal, strongly or not a given liquid will fill the structure spontaneously upon contact. Using alkylchlorosi- lanes,18 silica
Inverse Marx modulators for self-biasing klystron depressed collectors
Kemp, Mark A. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
2014-08-28T23:59:59.000Z
A novel pulsed depressed collector biasing scheme is proposed. This topology feeds forward energy recovered during one RF pulse for use on the following RF pulse. The presented ''inverse'' Marx charges biasing capacitors in series, and discharges them in parallel. Simulations are shown along with experimental demonstration on a 62kW klystron.
The Laplace Transform 1 Laplace transform and inverse transform
Yengulalp, Lynne
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
Nuclear applications of inverse scattering, present ... and future?
R. S. Mackintosh
2005-10-03T23:59:59.000Z
There now exists a practical method (IP) for the routine inversion of $S$-matrix elements to produce the corresponding potential. It can be applied to spin-1/2 and spin-1 projectiles. We survey the ways that IP inversion can be applied in nuclear physics by inverting $S_{lj}$ derived from theory or from experiment. The IP inversion method can be extended to invert $S_{lj}(E)$ over a range of energies to produce a potential $V(r,E) + \\vect{l}\\vdot\\gvect{\\sigma} V_{\\rm ls}(r,E)$. It also yields parity-dependent potentials between pairs of light nuclei and can be convoluted with a direct search on the $S$-matrix to produce `direct data $\\to V$ inversion'. The last is an economical alternative form of optical model search to fit many observables (e.g. for polarized deuterons) for many energies, producing an energy-dependent potential with many parameters (e.g. $T_{\\rm R}$ for deuterons).
Humanoid Walking Robot: Modeling, Inverse Dynamics, and Gain Scheduling Control
Williams II, Robert L.
and Robert L. Williams II Department of Mechanical Engineering Ohio University, Athens, OH 45701 Revised trajectories, recorded from real human walking cycle data. Kinematic and dynamic analysis is discussed. This analysis is accompanied by a comparison with available experimental data. Finally, an inverse plant
APPROXIMATE INVERSE PRECONDITIONING FOR THE CONJUGATE GRADIENT METHOD
Tùma, Miroslav
APPROXIMATE INVERSE PRECONDITIONING FOR THE CONJUGATE GRADIENT METHOD ON A VECTOR COMPUTER Michele definite matrix, by the preconditioned conjugate gradient method (PCG) (see, e.g., [4]). It is well of the conjugate gradient method reduces to computing a matrix vector product with G, an operation which offers
DISCRIMINATION AND CLASSIFICATION OF UXO USING MAGNETOMETRY: INVERSION AND ERROR
Sambridge, Malcolm
DISCRIMINATION AND CLASSIFICATION OF UXO USING MAGNETOMETRY: INVERSION AND ERROR ANALYSIS USING for the different solutions didn't even overlap. Introduction A discrimination and classification strategy ambiguity and possible remanent magnetization the recovered dipole moment is compared to a library
Inversion of Hydrological Tracer Test Data Using TomogrpahicConstraints
Linde, Niklas; Finsterle, Stefan; Hubbard, Susan
2004-11-11T23:59:59.000Z
A reasonable description of the hydraulic conductivity structure is a prerequisite for modeling contaminant transport. However, formulations of hydrogeological inverse problems utilizing hydrogeological data only often fail to reliably resolve features at a resolution required for accurately predicting transport. Incorporation of geophysical data into the inverse problem offers the potential to increase this resolution. In this study, we invert hydrological tracer test data using the shape and relative magnitude variations derived from geophysical tomographic data to regionalize a hydrogeological inverse problem in order to estimate the hydraulic conductivity structure. Our approach does not require that the petrophysical relationship be known a-priori, but that it is linear and stationary within each geophysical anomaly. However, tomograms are imperfect models of geophysical properties and geophysical properties are not necessarily strongly linked to hydraulic conductivity. Therefore, we focus on synthetic examples where the correlation between radar velocity and hydraulic conductivity, as well as the geophysical data acquisition errors, are varied in order to assess what aspects of the hydraulic conductivity structure we can expect to resolve under different conditions. The results indicate that regularization of the tracer inversion procedure using geophysical data improves estimates of hydraulic conductivity. We find that even under conditions of corrupted geophysical data, we can accurately estimate the effective hydraulic conductivity and areas of high and low hydraulic conductivity. However, given imperfect geophysical data, our results suggest that we cannot expect accurate estimates of the variability of the hydraulic conductivity structure.
Optimization Methods in Direct and Inverse Alexander G. Ramm1
Optimization Methods in Direct and Inverse Scattering Alexander G. Ramm1 and Semion Gutman2 1- mization problem, and solved by the Hybrid Stochastic-Deterministic minimization algorithm. A similar for the case of spherically symmetric potentials and fixed-energy phase shifts as the scattering data
On nonsingular potentials of Cox-Thompson inversion scheme
Tamas Palmai; Barnabas Apagyi
2011-11-25T23:59:59.000Z
We establish a condition for obtaining nonsingular potentials using the Cox-Thompson inverse scattering method with one phase shift. The anomalous singularities of the potentials are avoided by maintaining unique solutions of the underlying Regge-Newton integral equation for the transformation kernel. As a by-product, new inequality sequences of zeros of Bessel functions are discovered.
The Inverse Kinetics Method and PID Compensation of the
The Inverse Kinetics Method and PID Compensation of the Annular Core Research Reactor by Benjamin Kinetics Method and PID Compensation of the Annular Core Research Reactor by Benjamin Garnas ABSTRACT Kinetics Method and PID Compensation of the Annular Core Research Reactor by Benjamin Garnas B.S. General
A family of inversion formulas in Thermoacoustic Tomography
Nguyen, Linh V
2009-01-01T23:59:59.000Z
We present a family of closed form inversion formulas in thermoacoustic tomography in the case of a constant sound speed. The formulas are presented in both time-domain and frequency-domain versions. As special cases, they imply most of the previously known filtered backprojection type formulas.
Shape Reconstruction of Inverse Medium Scattering for the ...
2011-11-03T23:59:59.000Z
In practice, it is convenient to reduce the problem to a bounded domain by ... The well-posedness of the direct scattering is proved, and important energy. 2 .... The proof is completed by combining (2.6) and (2.4). Remark 2.1. .... It is essential for the success and efficiency of the inverse obstacle scattering to have a good and.
Inverse diffusion from knowledge of power densities Guillaume Bal
Bal, Guillaume
asymptotic expansions and (Fourier) transformation, this allow us to construct the power density) provides access to the power density H(x) = (x)|u|2 (x) for all x inside the domain of interestInverse diffusion from knowledge of power densities Guillaume Bal , Eric Bonnetier , Fran
Nonlinear Fourier Analysis The Direct & Inverse Scattering Transforms
Christov, Ivan C.
Nonlinear Fourier Analysis The Direct & Inverse Scattering Transforms for the Kortewegde Vries by ONR/NRL funding. Nonlinear Fourier Analysis p.1/15 #12;Background & Introduction (I) 1895: Korteweg equations known as the Scattering Transform. Nonlinear Fourier Analysis p.2/15 #12;Background
Assessing streamaquifer interactions through inverse modeling of flow routing q
Szilagyi, Jozsef
Assessing streamÂaquifer interactions through inverse modeling of flow routing q Jozsef Szilagyi a and Nieber, 1977; Troch et al., 1993; Brutsaert and Lopez, 1998; Szilagyi et al., 1998; Par- lange et al., 2001; Szilagyi, 2003a). Knowledge of this inter- action between streamflow and groundwater during flood
Inverse-design and optimization methods for centrifugal pump impellers
Twente, Universiteit
to be incompressible. As such, these methods are applicable to pumps, fans and hydraulic turbines. Furthermore details can lead to large changes in performance, like resulting head, efficiency and cavitation as input and the flow field and the performance are obtained as a result. In contrast, for an inverse
INVERSION OF CONVERTED-WAVE SEISMIC DATA FOR RESERVOIR CHARACTERIZATION
INVERSION OF CONVERTED-WAVE SEISMIC DATA FOR RESERVOIR CHARACTERIZATION AT RULISON FIELD, COLORADO Basin of northwest Colorado. The reservoir consists of lenticular fluvial sands, shales, and coals of magnitude lower than the seismic resolution which is 105 ft. The sandstone reservoirs are the primary target
Using Expert Knowledge in Solving the Seismic Inverse Problem ?
Ward, Karen
practical applications, it it important to solve the seismic inverse problem, i.e., to measure seismic exhausted. Even under the best conservation policies, there is (and there will be) a constant need to find that there are resources such as minerals at a certain location is to actually drill a borehole and analyze the materials
Interpreting Helioseismic Structure Inversion Results of Solar Active Regions
Chia-Hsien Lin; Sarbani Basu; Linghuai Li
2008-09-08T23:59:59.000Z
Helioseismic techniques such as ring-diagram analysis have often been used to determine the subsurface structural differences between solar active and quiet regions. Results obtained by inverting the frequency differences between the regions are usually interpreted as the sound-speed differences between them. These in turn are used as a measure of temperature and magnetic-field strength differences between the two regions. In this paper we first show that the "sound-speed" difference obtained from inversions is actually a combination of sound-speed difference and a magnetic component. Hence, the inversion result is not directly related to the thermal structure. Next, using solar models that include magnetic fields, we develop a formulation to use the inversion results to infer the differences in the magnetic and thermal structures between active and quiet regions. We then apply our technique to existing structure inversion results for different pairs of active and quiet regions. We find that the effect of magnetic fields is strongest in a shallow region above 0.985R_sun and that the strengths of magnetic-field effects at the surface and in the deeper (r < 0.98R_sun) layers are inversely related, i.e., the stronger the surface magnetic field the smaller the magnetic effects in the deeper layers, and vice versa. We also find that the magnetic effects in the deeper layers are the strongest in the quiet regions, consistent with the fact that these are basically regions with weakest magnetic fields at the surface. Because the quiet regions were selected to precede or follow their companion active regions, the results could have implications about the evolution of magnetic fields under active regions.
METAMODELS AS INPUT OF AN OPTIMIZATION ALGORITHM FOR SOLVING AN INVERSE EDDY CURRENT TESTING PROBLEM
Boyer, Edmond
METAMODELS AS INPUT OF AN OPTIMIZATION ALGORITHM FOR SOLVING AN INVERSE EDDY CURRENT TESTING-Curie, 91192 Gif-sur-Yvette, France Abstract A new mean of solution of eddy current testing (ECT) inverse
Inverse Compton scattering from plasma mirror experiment Hai-En Tsai, Joseph Shaw, Xiaoming Wang
Shvets, Gennady
Inverse Compton scattering from plasma mirror experiment Hai-En Tsai, Joseph Shaw, Xiaoming Wang 1 experiment, we tried to generate inverse Compton x-ray by reflecting driving pulse from plasma mirrors
Mesozoic tectonic inversion in the Neuquen Basin of west-central Argentina
Grimaldi Castro, Gabriel Orlando
2007-04-25T23:59:59.000Z
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...
Structural fabric of the Palisades Monocline: a study of positive inversion, Grand Canyon, Arizona
Orofino, James Cory
2005-08-29T23:59:59.000Z
of positive inversion to test model results and improve understanding of inversion processes. The N40W 90 oriented Palisades fault underlying the monocline has experienced northeast-southwest Precambrian extension and subsequent northeastsouthwest Laramide...
An Inverse Finite Element Analysis and A Parametric Study of Small Punch Tests
Xu, Zhenzhen
2012-02-14T23:59:59.000Z
the effects of SPT parameters including friction coefficient, punch head diameter, sample thickness, specimen scale and boundary conditions. The proposed inverse finite element (FE) method improves the accuracy of existing inverse FE methods...
Paris-Sud XI, Université de
Non-linear inversion modeling for Ultrasound Computer Tomography: transition from soft to hard Marseille cedex 20, France ABSTRACT Ultrasound Computer Tomography (UCT) is an imaging technique which has experiments. Keyword: Ultrasound Computer Tomography, Inverse Born Approximation, Elliptical Projection
An Inverse Finite Element Analysis and A Parametric Study of Small Punch Tests
Xu, Zhenzhen
2012-02-14T23:59:59.000Z
the effects of SPT parameters including friction coefficient, punch head diameter, sample thickness, specimen scale and boundary conditions. The proposed inverse finite element (FE) method improves the accuracy of existing inverse FE methods...
Direct Reservoir Parameter Estimation Using Joint Inversion of Marine Seismic AVA & CSEM Data
2005-01-01T23:59:59.000Z
estimation of reservoir parameters from geophysical data isthe seismic data fit at times below the reservoir. InversionReservoir Parameter Estimation Using Joint Inversion of Marine Seismic AVA & CSEM Data
Giles, Mike
, and its inverse erfinv(x) are a standard part of libraries such as Intel's MKL, AMD's ACML and NVIDIA
OBSERBATION OF HIGH INTENSITY X-RAYS IN INVERSE COMPTON SCATTERING EXPERIMENT
OBSERBATION OF HIGH INTENSITY X-RAYS IN INVERSE COMPTON SCATTERING EXPERIMENT S. Kashiwagi, M the first results of high intensity x-ray generation using Inverse Laser Compton scattering. This experiment Synchrotron Source (LSS). It is based on inverse Compton scattering via interaction between pulsed high power
EXPERIMENTAL STUDY OF AXISYMMETRIC INSTABILITY OF INVERSE DEE AND SQUARE TOKAMAK EQUILIBRIA
Sprott, Julien Clinton
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
Paris-Sud XI, Université de
Lipase hydration state in the gas phase: Sorption isotherm measurements and inverse gas Rochelle, Cedex 01, France. Keywords: Water, Lipase, Adsorption, Inverse Gas Chromatography, Solid/Gas@univ-lr.fr Fax : +33 5 46 45 82 65 Abbreviations: IGC, Inverse Gas Chromatography aW, water thermodynamic
Radiative inverse seesaw neutrino mass and dark matter
Guo Gang [INPAC, Department of Physics and Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai Jiao Tong University, Shanghai (China); He Xiaogang [INPAC, Department of Physics and Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai Jiao Tong University, Shanghai (China) and Department of Physics, National Tsing Hua University, and NCTS, Hsinchu, Taiwan (China); Li Guannan [INPAC, Department of Physics and Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai Jiao Tong University, Shanghai, Taiwan (China)
2013-05-23T23:59:59.000Z
Seesaw mechanism provides a natural explanation of light neutrino masses through suppression of heavy seesaw scale. In inverse seesaw models the seesaw scale can be much lower than that in the usual seesaw models. If terms inducing seesaw masses are further induced by loop corrections, the seesaw scale can be lowered to be in the range probed by experiments at the LHC without fine tuning. This talk, presented by X-G He, discuss models constructed in a recent preprint by us (arxiv:201207.6308) in which neutrino masses are generated at two loop level through inverse seesaw mechanism. These models also naturally have dark matter candidates. Although the recent data from Xenon100 put stringent constraint on the models, they can be consistent with data on neutrino masses, mixing, dark matter relic density and direct detection.
Inverse free electron laser accelerator for advanced light sources
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Duris, J. P.; Musumeci, P.; Li, R. K.
2012-06-01T23:59:59.000Z
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.
Evolving Design Rules for the Inverse Granular Packing Problem
Marc Z. Miskin; Heinrich M. Jaeger
2014-03-17T23:59:59.000Z
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.
Shot level parallelization of a seismic inversion code using PVM
Versteeg, R.J.; Gockenback, M.; Symes, W.W. [Rice Univ., Houston, TX (United States); Kern, M. [Inria, Le Chesnay (France)
1994-12-31T23:59:59.000Z
This paper presents experience with parallelization using PVM of DSO, a seismic inversion code developed in The Rice Inversion Project. It focuses on one aspect: trying to run efficiently on a cluster of 4 workstations. The authors use a coarse grain parallelism in which they dynamically distribute the shots over the available machines in the cluster. The modeling and migration of their code is parallelized very effectively by this strategy; they have reached a overall performance of 104 Mflops using a configuration of one manager with 3 workers, a speedup of 2.4 versus the serial version, which according to Amdahl`s law is optimal given the current design of their code. Further speedup is currently limited by the non parallelized part of their code optimization, linear algebra and i(o).
Magnetic catalysis and inverse magnetic catalysis in QCD
Niklas Mueller; Jan M. Pawlowski
2015-02-27T23:59:59.000Z
We investigate the effects of strong magnetic fields on the QCD phase structure at vanishing density by solving the gluon and quark gap equations, and by studying the dynamics of the quark scattering with the four-fermi coupling. The chiral crossover temperature as well as the chiral condensate are computed. For asymptotically large magnetic fields we find magnetic catalysis, while we find inverse magnetic catalysis for intermediate magnetic fields. Moreover, for large magnetic fields the chiral phase transition for massless quarks turns into a crossover. The underlying mechanisms are then investigated analytically within a few simplifications of the full numerical analysis. We find that a combination of gluon screening effects and the weakening of the strong coupling is responsible for the phenomenon of inverse catalysis. In turn, the magnetic catalysis at large magnetic field is already indicated by simple arguments based on dimensionality.
Three-dimensional induced polarization data inversion for complex resistivity
Commer, M.; Newman, G.A.; Williams, K.H.; Hubbard, S.S.
2011-03-15T23:59:59.000Z
The conductive and capacitive material properties of the subsurface can be quantified through the frequency-dependent complex resistivity. However, the routine three-dimensional (3D) interpretation of voluminous induced polarization (IP) data sets still poses a challenge due to large computational demands and solution nonuniqueness. We have developed a flexible methodology for 3D (spectral) IP data inversion. Our inversion algorithm is adapted from a frequency-domain electromagnetic (EM) inversion method primarily developed for large-scale hydrocarbon and geothermal energy exploration purposes. The method has proven to be efficient by implementing the nonlinear conjugate gradient method with hierarchical parallelism and by using an optimal finite-difference forward modeling mesh design scheme. The method allows for a large range of survey scales, providing a tool for both exploration and environmental applications. We experimented with an image focusing technique to improve the poor depth resolution of surface data sets with small survey spreads. The algorithm's underlying forward modeling operator properly accounts for EM coupling effects; thus, traditionally used EM coupling correction procedures are not needed. The methodology was applied to both synthetic and field data. We tested the benefit of directly inverting EM coupling contaminated data using a synthetic large-scale exploration data set. Afterward, we further tested the monitoring capability of our method by inverting time-lapse data from an environmental remediation experiment near Rifle, Colorado. Similar trends observed in both our solution and another 2D inversion were in accordance with previous findings about the IP effects due to subsurface microbial activity.
Inverse transonic wing design on a vector processer
Anderson, William Kyle
1982-01-01T23:59:59.000Z
of the flowfield, the new airfoil shape could be calculated from continuity considerations. perhaps the most recent method developed for transonic w' ng design was presented in 1981 by Shanker . This technique is a full potential method which utilizes.... Carlson An inverse transoric wing design method suitable for use on a vec- tor processer is presented. This method is based on the three dimen- sional, full potential flow equation written in conservation fc m. The technique for calculating the airfoil...
Combined approach to the inverse protein folding problem. Final report
Ruben A. Abagyan
2000-06-01T23:59:59.000Z
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).
Haber, Eldad
2014-03-17T23:59:59.000Z
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.
Kowalsky, M.B.; Birkholzer, J.; Peterson, J.; Finsterle, S.; Mukhopadhya y, S.; Tsang, Y.T.
2008-01-01T23:59:59.000Z
first step toward comprehensive inversion of the heater testfirst step toward a full inversion of the heater test data,
SPECTRAL MEASUREMENTS OF INFRARED SKY RADIANCE
Berdahl, P.
2014-01-01T23:59:59.000Z
displace conventional air conditioning. In order to computeduring periods of high air conditioning load. SAMPLES OF THE
Zenith Radiance Retrieval of Cloud Properties
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
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Identifying Isotropic Events Using a Regional Moment Tensor Inversion
Ford, S R; Dreger, D S; Walter, W R
2008-11-04T23:59:59.000Z
We calculate the deviatoric and isotropic source components for 17 explosions at the Nevada Test Site, as well as 12 earthquakes and 3 collapses in the surrounding region of the western US, using a regional time-domain full waveform inversion for the complete moment tensor. The events separate into specific populations according to their deviation from a pure double-couple and ratio of isotropic to deviatoric energy. The separation allows for anomalous event identification and discrimination between explosions, earthquakes, and collapses. Confidence regions of the model parameters are estimated from the data misfit by assuming normally distributed parameter values. We investigate the sensitivity of the resolved parameters of an explosion to imperfect Earth models, inaccurate event depths, and data with low signal-to-noise ratio (SNR) assuming a reasonable azimuthal distribution of stations. In the band of interest (0.02-0.10 Hz) the source-type calculated from complete moment tensor inversion is insensitive to velocity models perturbations that cause less than a half-cycle shift (<5 sec) in arrival time error if shifting of the waveforms is allowed. The explosion source-type is insensitive to an incorrect depth assumption (for a true depth of 1 km), and the goodness-of-fit of the inversion result cannot be used to resolve the true depth of the explosion. Noise degrades the explosive character of the result, and a good fit and accurate result are obtained when the signal-to-noise ratio (SNR) is greater than 5. We assess the depth and frequency dependence upon the resolved explosive moment. As the depth decreases from 1 km to 200 m, the isotropic moment is no longer accurately resolved and is in error between 50-200%. However, even at the most shallow depth the resultant moment tensor is dominated by the explosive component when the data have a good SNR.
Identifying isotropic events using a regional moment tensor inversion
Ford, S R; Dreger, D S; Walter, W R
2008-07-16T23:59:59.000Z
The deviatoric and isotropic source components for 17 explosions at the Nevada Test Site, as well as 12 earthquakes and 3 collapses in the surrounding region of the western US, are calculated using a regional time-domain full waveform inversion for the complete moment tensor. The events separate into specific populations according to their deviation from a pure double-couple and ratio of isotropic to deviatoric energy. The separation allows for anomalous event identification and discrimination between explosions, earthquakes, and collapses. Confidence regions of the model parameters are estimated from the data misfit by assuming normally distributed parameter values. We investigate the sensitivity of the resolved parameters of an explosion to imperfect Earth models, inaccurate event depths, and data with a low signal-to-noise ratio (SNR) assuming a reasonable azimuthal distribution of stations. In the band of interest (0.02-0.10 Hz) the source-type calculated from complete moment tensor inversion is insensitive to velocity models perturbations that cause less than a half-cycle shift (<5 sec) in arrival time error if shifting of the waveforms is allowed. The explosion source-type is insensitive to an incorrect depth assumption (for a true depth of 1 km), but the goodness-of-fit of the inversion result cannot be used to resolve the true depth of the explosion. Noise degrades the explosive character of the result, and a good fit and accurate result are obtained when the signal-to-noise ratio (SNR) is greater than 5. We assess the depth and frequency dependence upon the resolved explosive moment. As the depth decreases from 1 km to 200 m, the isotropic moment is no longer accurately resolved and is in error between 50-200%. However, even at the most shallow depth the resultant moment tensor is dominated by the explosive component when the data has a good SNR. The sensitivity investigation is extended via the introduction of the network sensitivity solution, which takes into account the unique station distribution, frequency band, and SNR of a given test scenario. An example of this analysis is presented for the North Korea test, which shows that in order to constrain the explosive component one needs a certain station configuration. In the future we will analyze the bias in the source-type parameters due to error in the Green's function by incorporating a suite of suitable velocity models in the inversion.
The equivalence of inverse Compton scattering and the undulator concept
Ng, K.Y,; /Fermilab
2009-08-01T23:59:59.000Z
Inverse Compton scattering is a method to produce very high frequency photon beam. However, the production mechanism can also be viewed as a undulator emission. This is because the electron sees electric and magnetic fields of the incident laser beam and is driven into transverse oscillatory motion in exactly the same way when the electron passes through a undulator consisting of alternating magnetic field. This note gives a detailed examination of the similarity about the two views. Equivalent undulator parameters are derived for the incident laser beam, as well as the differential cross section of photon emission.
Proton inelastic scattering on {sup 56}Ni in inverse kinematics
Kraus, G.; Egelhof, P.; Fischer, C.; Geissel, H.; Himmler, A.; Nickel, F.; Muenzenberg, G.; Schwab, W.; Weiss, A. [GSI, Darmstadt (Germany); Chulkov, L.; Golovkov, M.; Ogloblin, A. [I.V. Kurchatov Inst., Moscow (Russian Federation); Friese, J.; Gillitzer, A.; Koerner, H.J.; Peter, M. [TU, Munich (Germany); Henning, W.; Schiffer, J.P. [Argonne National Lab., IL (United States); Kratz, J.V. [Univ. of Mainz (Germany)
1993-10-01T23:59:59.000Z
Inelastic proton scattering to the first excited 2{sup +} state at 2.701 MeV in doubly magic {sup 56}Ni was studied at 101 MeV/u in inverse kinematics. The radioactive {sup 56}Ni ion beam was obtained from the SIS heavy ion synchrotron at GSI Darmstadt via fragmentation of a {sup 58}Ni beam, and separation by the fragment separator (FRS). A value B(E2, 0{sup +} {yields} 2{sup +}) = 600 {+-} 120 e{sup 2} fm{sup 4} was obtained which corresponds to a deformation parameter {beta} ({sup 56}Ni) = 0.173 {+-} 0.017.
A Double Cryptography Using The Smarandache Keedwell Cross Inverse Quasigroup
Temitope Gbolahan Jaiyeola
2009-03-10T23:59:59.000Z
The present study further strengthens the use of the Keedwell CIPQ against attack on a system by the use of the Smarandache Keedwell CIPQ for cryptography in a similar spirit in which the cross inverse property has been used by Keedwell. This is done as follows. By constructing two S-isotopic S-quasigroups(loops) $U$ and $V$ such that their Smarandache automorphism groups are not trivial, it is shown that $U$ is a SCIPQ(SCIPL) if and only if $V$ is a SCIPQ(SCIPL). Explanations and procedures are given on how these SCIPQs can be used to double encrypt information.
Optical inverse Compton emission from clusters of galaxies
Yamazaki, Ryo
2015-01-01T23:59:59.000Z
Shocks around clusters of galaxies accelerate electrons which upscatter the Cosmic Microwave Background photons to higher-energies. We use an analytical model to calculate this inverse Compton (IC) emission, taking into account the effects of additional energy losses via synchrotron and Coulomb scattering. We find that the surface brightness of the optical IC emission increases with redshift and halo mass. The IC emission surface brightness, 32--34~mag~arcsec$^{-2}$, for massive clusters is potentially detectable by the newly developed Dragonfly Telephoto Array.
Sneutrino inflation in supersymmetric B - L with inverse seesaw
Khalil, Shaaban; Sil, Arunansu [Centre for Theoretical Physics, Zewail City of Science and Technology, Sheikh Zayed, 12588, Giza (Egypt); Department of Mathematics, Faculty of Science, Ain Shams University, Cairo, 11566 (Egypt); Department of Physics, Indian Institute of Technology, Guwahati, Assam 781039 (India)
2012-07-27T23:59:59.000Z
We have shown that inflation in the supersymmetric B - L extension of the Standard Model can be realized where one of the associated right-handed sneutrinos can provide a non-trivial inflationary trajectory at tree level (hence breaking B - L during inflation). As soon as the inflation ends, the right-handed sneutrino falls into the supersymmetric vacuum, with a vanishing vacuum expectation value, so that B - L symmetry is restored. The B - L gauge symmetry will be radiatively broken at a TeV scale and light neutrino masses are generated through the inverse seesaw mechanism.
Seismic Attenuation Inversion with t* Using tstarTomog.
Preston, Leiph
2014-09-01T23:59:59.000Z
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.
Center for Inverse Design: Principal Investigators in the Center for
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWPSuccess StoriesFebruaryMetalControlInverse Design Principal
Center for Inverse Design: Research Thrusts and Subtasks
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWPSuccess StoriesFebruaryMetalControlInverse Design
Center for Inverse Design poster for EFRC Summit, May 2011
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItem NotEnergy,ARMForms About Batteriesmetal-organic frameworks EFRC 1001 wordInverse
Hinnell, A.C.; Ferre, T.P.A.; Vrugt, J.A.; Huisman, J.A.; Moysey, S.; Rings, J.; Kowalsky, M.B.
2009-11-01T23:59:59.000Z
There is increasing interest in the use of multiple measurement types, including indirect (geophysical) methods, to constrain hydrologic interpretations. To date, most examples integrating geophysical measurements in hydrology have followed a three-step, uncoupled inverse approach. This approach begins with independent geophysical inversion to infer the spatial and/or temporal distribution of a geophysical property (e.g. electrical conductivity). The geophysical property is then converted to a hydrologic property (e.g. water content) through a petrophysical relation. The inferred hydrologic property is then used either independently or together with direct hydrologic observations to constrain a hydrologic inversion. We present an alternative approach, coupled inversion, which relies on direct coupling of hydrologic models and geophysical models during inversion. We compare the abilities of coupled and uncoupled inversion using a synthetic example where surface-based electrical conductivity surveys are used to monitor one-dimensional infiltration and redistribution.
Solution accelerators for large scale 3D electromagnetic inverse problems
Newman, Gregory A.; Boggs, Paul T.
2004-04-05T23:59:59.000Z
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.
The inverse problems of wing panel manufacture processes
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
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.
Kouri, Donald J. (Houston, TX); Vijay, Amrendra (Houston, TX); Zhang, Haiyan (Houston, TX); Zhang, Jingfeng (Houston, TX); Hoffman, David K. (Ames, IA)
2007-05-01T23:59:59.000Z
A method and system for solving the inverse acoustic scattering problem using an iterative approach with consideration of half-off-shell transition matrix elements (near-field) information, where the Volterra inverse series correctly predicts the first two moments of the interaction, while the Fredholm inverse series is correct only for the first moment and that the Volterra approach provides a method for exactly obtaining interactions which can be written as a sum of delta functions.
The inverse conductivity problem with power densities in dimension n2
François Monard, Guillaume Bal
2012-06-19T23:59:59.000Z
Jun 19, 2012 ... The inverse conductivity problem with power densities in dimension n ? 2. François Monard Guillaume Bal. Dept. of Applied Physics and ...
Partitioned Waveform Inversion Applied to Eurasia and Northern Africa
bedle, H; Matzel, E; Flanagan, M
2006-07-27T23:59:59.000Z
This report summarizes the data analysis achieved during Heather Bedle's eleven-week Technical Scholar internship at Lawrence Livermore National Labs during the early summer 2006. The work completed during this internship resulted in constraints on the crustal and upper mantle S-velocity structure in Northern Africa, the Mediterranean, the Middle East, and Europe, through the fitting of regional waveform data. This data extends current raypath coverage and will be included in a joint inversion along with data from surface wave group velocity measurements, S and P teleseismic arrival time data, and receiver function data to create an improved velocity model of the upper mantle in this region. The tectonic structure of the North African/Mediterranean/Europe/Middle Eastern study region is extremely heterogeneous. This region consists of, among others, stable cratons and platforms such as the West Africa Craton, and Baltica in Northern Europe; oceanic subduction zones throughout the Mediterranean Sea where the African and Eurasian plate collide; regions of continental collision as the Arabian Plate moves northward into the Turkish Plate; and rifting in the Red Sea, separating the Arabian and Nubian shields. With such diverse tectonic structures, many of the waveforms were difficult to fit. This is not unexpected as the waveforms are fit using an averaged structure. In many cases the raypaths encounter several tectonic features, complicating the waveform, and making it hard for the software to converge on a 1D average structure. Overall, the quality of the waveform data was average, with roughly 30% of the waveforms being discarded due to excessive noise that interfered with the frequency ranges of interest. An inversion for the 3D S-velocity structure of this region was also performed following the methodology of Partitioned Waveform Inversion (Nolet, 1990; Van der Lee and Nolet, 1997). The addition of the newly fit waveforms drastically extends the range of the model. The model now extends as far east in Africa to cover Chad and Niger, and reaches south to cover Zambia. The model is also stretched eastward to cover the eastern half of India, and northward to cover the southern portion of Scandinavia.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Pablant, N. A.; Bell, R. E.; Bitter, M.; Delgado-Aparicio, L.; Hill, K. W.; Lazerson, S.; Morita, S.
2014-11-01T23:59:59.000Z
Accurate tomographic inversion is important for diagnostic systems on stellarators and tokamaks which rely on measurements of line integrated emission spectra. A tomographic inversion technique based on spline optimization with enforcement of constraints is described that can produce unique and physically relevant inversions even in situations with noisy or incomplete input data. This inversion technique is routinely used in the analysis of data from the x-ray imaging crystal spectrometer (XICS) installed at LHD. The XICS diagnostic records a 1D image of line integrated emission spectra from impurities in the plasma. Through the use of Doppler spectroscopy and tomographic inversion, XICSmore »can provide pro#12;file measurements of the local emissivity, temperature and plasma flow. Tomographic inversion requires the assumption that these measured quantities are flux surface functions, and that a known plasma equilibrium reconstruction is available. In the case of low signal levels or partial spatial coverage of the plasma cross-section, standard inversion techniques utilizing matrix inversion and linear-regularization often cannot produce unique and physically relevant solutions. The addition of physical constraints, such as parameter ranges, derivative directions, and boundary conditions, allow for unique solutions to be reliably found. The constrained inversion technique described here utilizes a modifi#12;ed Levenberg-Marquardt optimization scheme, which introduces a condition avoidance mechanism by selective reduction of search directions. The constrained inversion technique also allows for the addition of more complicated parameter dependencies, for example geometrical dependence of the emissivity due to asymmetries in the plasma density arising from fast rotation. The accuracy of this constrained inversion technique is discussed, with an emphasis on its applicability to systems with limited plasma coverage.« less
Pablant, N. A.; Bell, R. E.; Bitter, M.; Delgado-Aparicio, L.; Hill, K. W.; Lazerson, S. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States); Morita, S. [National Institute for Fusion Science, Toki 509-5292, Gifu (Japan)
2014-11-15T23:59:59.000Z
Accurate tomographic inversion is important for diagnostic systems on stellarators and tokamaks which rely on measurements of line integrated emission spectra. A tomographic inversion technique based on spline optimization with enforcement of constraints is described that can produce unique and physically relevant inversions even in situations with noisy or incomplete input data. This inversion technique is routinely used in the analysis of data from the x-ray imaging crystal spectrometer (XICS) installed at the Large Helical Device. The XICS diagnostic records a 1D image of line integrated emission spectra from impurities in the plasma. Through the use of Doppler spectroscopy and tomographic inversion, XICS can provide profile measurements of the local emissivity, temperature, and plasma flow. Tomographic inversion requires the assumption that these measured quantities are flux surface functions, and that a known plasma equilibrium reconstruction is available. In the case of low signal levels or partial spatial coverage of the plasma cross-section, standard inversion techniques utilizing matrix inversion and linear-regularization often cannot produce unique and physically relevant solutions. The addition of physical constraints, such as parameter ranges, derivative directions, and boundary conditions, allow for unique solutions to be reliably found. The constrained inversion technique described here utilizes a modified Levenberg-Marquardt optimization scheme, which introduces a condition avoidance mechanism by selective reduction of search directions. The constrained inversion technique also allows for the addition of more complicated parameter dependencies, for example, geometrical dependence of the emissivity due to asymmetries in the plasma density arising from fast rotation. The accuracy of this constrained inversion technique is discussed, with an emphasis on its applicability to systems with limited plasma coverage.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Pablant, N. A. [PPPL; Bell, R. E. [PPPL; Bitter, M. [PPPL; Delgado-Aparicio, L. [PPPL; Hill, K. W. [PPPL; Lazerson, S. [PPPL; Morita, S. [National Institute for Fusion Science, Toki 509-5292, Gifu, Japan
2014-11-01T23:59:59.000Z
Accurate tomographic inversion is important for diagnostic systems on stellarators and tokamaks which rely on measurements of line integrated emission spectra. A tomographic inversion technique based on spline optimization with enforcement of constraints is described that can produce unique and physically relevant inversions even in situations with noisy or incomplete input data. This inversion technique is routinely used in the analysis of data from the x-ray imaging crystal spectrometer (XICS) installed at LHD. The XICS diagnostic records a 1D image of line integrated emission spectra from impurities in the plasma. Through the use of Doppler spectroscopy and tomographic inversion, XICS can provide pro#12;file measurements of the local emissivity, temperature and plasma flow. Tomographic inversion requires the assumption that these measured quantities are flux surface functions, and that a known plasma equilibrium reconstruction is available. In the case of low signal levels or partial spatial coverage of the plasma cross-section, standard inversion techniques utilizing matrix inversion and linear-regularization often cannot produce unique and physically relevant solutions. The addition of physical constraints, such as parameter ranges, derivative directions, and boundary conditions, allow for unique solutions to be reliably found. The constrained inversion technique described here utilizes a modifi#12;ed Levenberg-Marquardt optimization scheme, which introduces a condition avoidance mechanism by selective reduction of search directions. The constrained inversion technique also allows for the addition of more complicated parameter dependencies, for example geometrical dependence of the emissivity due to asymmetries in the plasma density arising from fast rotation. The accuracy of this constrained inversion technique is discussed, with an emphasis on its applicability to systems with limited plasma coverage.
Spontaneous generation of local CP violation and inverse magnetic catalysis
Lang Yu; Hao Liu; Mei Huang
2014-09-14T23:59:59.000Z
In the chiral symmetric phase, the polarized instanton--anti-instanton molecule pairing induces a nontrivial repulsive interaction in the iso-scalar axial-vector channel. As a consequence, one unusual property is observed that in the chiral restoration phase, there is a first order phase transition for the spontaneous generation of local CP violation and chiral imbalance. Furthermore, it is found that external magnetic fields will lower the critical temperature for the local CP-odd phase transition and catalyze the chiral imbalance, which destroys the chiral condensate with pairing quarks between different chiralities. A reasonable strength of the repulsive interaction in the iso-scalar axial-vector channel can naturally explain the inverse magnetic catalysis around the critical temperature under external magnetic fields.
Chirped pulse inverse free-electron laser vacuum accelerator
Hartemann, Frederic V. (Dublin, CA); Baldis, Hector A. (Pleasanton, CA); Landahl, Eric C. (Walnut Creek, CA)
2002-01-01T23:59:59.000Z
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.
Inverse time-of-flight spectrometer for beam plasma research
Yushkov, Yu. G., E-mail: yuyushkov@gmail.com; Zolotukhin, D. B.; Tyunkov, A. V. [Tomsk State University of Control Systems and Radioelectronics, 40 Lenin Ave., Tomsk 634050 (Russian Federation); Oks, E. M. [Tomsk State University of Control Systems and Radioelectronics, 40 Lenin Ave., Tomsk 634050 (Russian Federation); Institute of High Current Electronics SB RAS, 2/3, Akademichesky Ave., Tomsk 634055 (Russian Federation); Savkin, K. P. [Institute of High Current Electronics SB RAS, 2/3, Akademichesky Ave., Tomsk 634055 (Russian Federation)
2014-08-15T23:59:59.000Z
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 (5–20 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.
Progress in relativistic gravitational theory using the inverse scattering method
G. Neugebauer; R. Meinel
2003-04-23T23:59:59.000Z
The increasing interest in compact astrophysical objects (neutron stars, binaries, galactic black holes) has stimulated the search for rigorous methods, which allow a systematic general relativistic description of such objects. This paper is meant to demonstrate the use of the inverse scattering method, which allows, in particular cases, the treatment of rotating body problems. The idea is to replace the investigation of the matter region of a rotating body by the formulation of boundary values along the surface of the body. In this way we construct solutions describing rotating black holes and disks of dust ("galaxies"). Physical properties of the solutions and consequences of the approach are discussed. Among other things, the balance problem for two black holes can be tackled.
A reservoir for inverse power law decoherence of a qubit
Filippo Giraldi; Francesco Petruccione
2011-01-24T23:59:59.000Z
The exact dynamics of a Jaynes-Cummings model for a qubit interacting with a continuous distribution of bosons, characterized by a special form of the spectral density, is evaluated analytically. The special reservoir is designed to induce anomalous decoherence, resulting in an inverse power law relaxation, of power 3/2, over an evaluated long time scale. If compared to the exponential-like relaxation obtained from the original Jaynes-Cummings model for Lorentzian-type spectral density functions, decoherence is strongly suppressed. The special reservoir exhibits an upper band edge frequency coinciding with the qubit transition frequency. Known theoretical models of photonic band gap media suitable for the realization of the designed reservoir are proposed.
A reservoir for inverse power law decoherence of a qubit
Giraldi, Filippo
2010-01-01T23:59:59.000Z
The exact dynamics of a Jaynes-Cummings model for a qubit interacting with a continuous distribution of bosons, characterized by a special form of the spectral density, is evaluated analytically. The special reservoir is designed to induce anomalous decoherence, resulting in an inverse power law relaxation, of power $3/2$, over an evaluated long time scale. If compared to the exponential-like relaxation obtained from the original Jaynes-Cummings model for Lorentzian-type spectral density functions, decoherence is strongly suppressed. The special reservoir exhibits an upper band edge frequency coinciding with the qubit transition frequency. Known theoretical models of photonic band gap media suitable for the realization of the designed reservoir are proposed.
Comparison of methods for inverse design of radiant enclosures.
Franca, Francis (Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil); Larsen, Marvin Elwood; Howell, John R. (University of Texas at Austin, Austin, TX); Daun, Kyle (National Research Council of Canada Laboratory, Ottawa, Canada); Leduc, Guillaume (Laboratoire d< U+2019> EnergÔetique, UniversitÔe Paul Sabatier, Toulouse, France)
2005-03-01T23:59:59.000Z
A particular inverse design problem is proposed as a benchmark for comparison of five solution techniques used in design of enclosures with radiating sources. The enclosure is three-dimensional and includes some surfaces that are diffuse and others that are specular diffuse. Two aspect ratios are treated. The problem is completely described, and solutions are presented as obtained by the Tikhonov method, truncated singular value decomposition, conjugate gradient regularization, quasi-Newton minimization, and simulated annealing. All of the solutions use a common set of exchange factors computed by Monte Carlo, and smoothed by a constrained maximum likelihood estimation technique that imposes conservation, reciprocity, and non-negativity. Solutions obtained by the various methods are presented and compared, and the relative advantages and disadvantages of these methods are summarized.
Axion Like Particles and the Inverse Seesaw Mechanism
Carvajal, C D R; Nishi, C C; Sánchez-Vega, B L
2015-01-01T23:59:59.000Z
Light pseudoscalars known as axion like particles (ALPs) may be behind physical phenomena like the Universe transparency to ultra-energetic photons, the soft $\\gamma$-ray excess from the Coma cluster, and the 3.5 keV line. We explore the connection of these particles with the inverse seesaw (ISS) mechanism for neutrino mass generation. We propose a very restrictive setting where the scalar field hosting the ALP is also responsible for generating the ISS mass scales through its vacuum expectation value on gravity induced nonrenormalizable operators. A discrete gauge symmetry protects the theory from the appearance of overly strong gravitational effects and discrete anomaly cancellation imposes strong constraints on the order of the group. The anomalous U$(1)$ symmetry leading to the ALP is an extended lepton number and the protective discrete symmetry can be always chosen as a subgroup of a combination of the lepton number and the baryon number.
Zeroth-order inversion of transient head observations
Vasco, D.W.
2007-08-15T23:59:59.000Z
A high-frequency, asymptotic solution for transient head,appropriate for a medium containing smoothly varying heterogeneity,provides a basis for efficient inverse modeling. The semi analyticsolution is trajectory based, akin to ray methods used in modeling wavepropagation, and may be constructed by post processing the output of anumerical simulator. For high frequencies, the amplitude sensitivities,the relationship between changes in flow properties and changes in headampliude, are dominated by the phase term which may be computed directlyfrom the output of the simulator. Thus, transient head waveforms may beinverted with little more computation than is required to invert arrivaltimes. An applicatino to synthetic head values indicates that thetechnique can be used to improve the fit to waveforms. An application totransient head data from the Migration experiment in Switzerland revealsa narrow, high conductivity pathway within a 0.5 m thick zone offracturing.
Source-independent full waveform inversion of seismic data
Lee, Ki Ha
2006-02-14T23:59:59.000Z
A set of seismic trace data is collected in an input data set that is first Fourier transformed in its entirety into the frequency domain. A normalized wavefield is obtained for each trace of the input data set in the frequency domain. Normalization is done with respect to the frequency response of a reference trace selected from the set of seismic trace data. The normalized wavefield is source independent, complex, and dimensionless. The normalized wavefield is shown to be uniquely defined as the normalized impulse response, provided that a certain condition is met for the source. This property allows construction of the inversion algorithm disclosed herein, without any source or source coupling information. The algorithm minimizes the error between data normalized wavefield and the model normalized wavefield. The methodology is applicable to any 3-D seismic problem, and damping may be easily included in the process.
Atmospheric Inverse Estimates of Methane Emissions from Central California
Zhao, Chuanfeng; Andrews, Arlyn E.; Bianco, Laura; Eluszkiewicz, Janusz; Hirsch, Adam; MacDonald, Clinton; Nehrkorn, Thomas; Fischer, Marc L.
2008-11-21T23:59:59.000Z
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.
Spherical Resorcinol-Formaldehyde Synthesis by Inverse Suspension Polymerization
Ray, Robert J.; Scrivens, Walter A.; Nash, Charles
2005-10-21T23:59:59.000Z
Base catalyzed sol-gel polycondensation of resorcinol (1,3-dihydroxybenzene) with formaldehyde by inverse suspension polymerization leads to the formation of uniform, highly cross-linked, translucent, spherical gels, which have increased selectivity and capacity for cesium ion removal from high alkaline solutions. Because of its high selectivity for cesium ion, resorcinol-formaldehyde (R-F) resins are being considered for process scale column radioactive cesium removal by ion-exchange at the Waste Treatment and Immobilization Plant (WTP), which is now under construction at the Hanford site. Other specialty resins such as Superlig{reg_sign} 644 have been ground and sieved and column tested for process scale radioactive cesium removal but show high pressure drops across the resin bed during transition from column regeneration to loading and elution. Furthermore, van Deemter considerations indicate better displacement column chromatography by the use of spherical particle beads rather than irregularly shaped ground or granular particles. In our studies batch contact equilibrium experiments using a high alkaline simulant show a definite increase in cesium loading onto spherical R-F resin. Distribution coefficient (Kd) values ranged from 777 to 429 mL/g in the presence of 0.1M and 0.7M potassium ions, respectively. Though other techniques for making R-F resins have been employed, to our knowledge no one has made spherical R-F resins by inverse suspension polymerization. Moreover, in this study we discuss the data comparisons to known algebraic isotherms used to evaluate ion-exchange resins for WTP plant scale cesium removal operations.
An Inverse Problem for Toeplitz Matrices and the Synthesis of Discrete Transmission Lines
Allen, Jont
An Inverse Problem for Toeplitz Matrices and the Synthesis of Discrete Transmission Lines Russel E and inverse problems for a transmission line which consists of piecewise constant components. Knowing the impulse response of the transmission line, we can calculate the capaci- tance taper of the line, and vice
The Phase Inversion-based Coal-CO2 Slurry (PHICCOS) Feeding System
The Phase Inversion-based Coal-CO2 Slurry (PHICCOS) Feeding System: Design, Coupled Multiscale. Commercially available feeding systems are based on coal-water slurry or lock hoppers. The earlier penalizes coal feeding system. The proposed Phase Inversion-based Coal-CO2 Slurry (PHICCOS) feeding system uses
Inversion in indirect optimal control: constrained and unconstrained F. Chaplais and N. Petit
Abstract-- This paper focuses on using non linear inversion in optimal control problems. This technique, we address the case of linear systems with a control affine cost to be minimized under inputInversion in indirect optimal control: constrained and unconstrained cases F. Chaplais and N. Petit
Weighted Radon transforms for which the Chang approximate inversion formula is precise
Paris-Sud XI, Université de
Weighted Radon transforms for which the Chang approximate inversion formula is precise R.G. Novikov formula is precise. Some subsequent results, including the Cormack type inversion for these transforms, are also given. 1.Introduction We consider the weighted ray transformation PW defined by the formula PW f
Eddy-current interaction with an ideal crack. II. The inverse problem John FL Bowler
Bowler, John R.
Eddy-current interaction with an ideal crack. II. The inverse problem John FL Bowler The University 1994) Eddy-current inversion is the process whereby the geometry of a flaw in a metal is derived from eddy-current probe impedance measurements. The approach is based on an optimization scheme that seeks
Theory of eddy current inversion Stephen:J. Nortona) and John FL Bowler
Bowler, John R.
Theory of eddy current inversion Stephen:J. Nortona) and John FL Bowler University of Surrey) The inverse eddy current problem can be described as the task of reconstructing an unknown distribution of electrical conductivity from eddy-current probe impedance measurements recorded as a function of probe
On an inverse problem: Recovery of non-smooth solutions to backward heat equation
Daripa, Prabir
On an inverse problem: Recovery of non-smooth solutions to backward heat equation Fabien Ternat 2011 Accepted 2 November 2011 Available online 11 November 2011 Keywords: Heat equation Inverse problem and CrankNicolson schemes and applied successfully to solve for smooth solutions of backward heat equation
Oldenburg, Douglas W.
Geophysical inversion in an integrated mineral exploration program: examples from the San NicolÂ´as deposit Nigel Phillips and Douglas W. Oldenburg, UBC-Geophysical Inversion Facility, University of British of the subsurface from surface geophysical data, coupled with an increasing need to explore for minerals
Advanced inverse techniques for the design of directional solidi cation processes
Zabaras, Nicholas J.
Advanced inverse techniques for the design of directional solidi cation processes Nicholas Zabaras methodologies for thermal process design can be developed using inverse problem theory. Such techniques the problem of designing the mold cooling/heating conditions such that stable solidi cation growth is obtained
Adjoint Inverse Modeling of Black Carbon During ACE-A. Hakami 1
Sandu, Adrian
in northeast China and Japan are increased. 1 #12;Introduction Black (or elemental) carbon (BC) is the mainAdjoint Inverse Modeling of Black Carbon During ACE- Asia A. Hakami 1 , D. K. Henze 1 , J. H model is used for inverse modeling of black carbon during ACE- Asia. We use the 4D-Var approach
On the Inversion of Mel-Frequency Cepstral Coefficients for Speech Enhancement Applications
De Leon, Phillip
On the Inversion of Mel-Frequency Cepstral Coefficients for Speech Enhancement Applications Laura E recognition system. The use of GMMs for speech enhancement applications has only recently been proposed present a means to invert MFCCs for use in speech enhancement applications. Results for cepstral inversion
An Ankle-Foot Prosthesis Emulator with Control of Plantarflexion and Inversion-Eversion Torques
Collins, Steven H.
An Ankle-Foot Prosthesis Emulator with Control of Plantarflexion and Inversion-Eversion Torques-foot prosthesis with two independently-actuated toes that are coordinated to provide plantarflexion and inversion prosthesis features. A similar morphology may be effective for autonomous devices. I. INTRODUCTION Robotic
GEOPHYSICAL INVERSION IN AN INTEGRATED EXPLORATION PROGRAM: EXAMPLES FROM THE SAN NICOL AS DEPOSIT
Oldenburg, Douglas W.
GEOPHYSICAL INVERSION IN AN INTEGRATED EXPLORATION PROGRAM: EXAMPLES FROM THE SAN NICOL Â´AS DEPOSIT information to the explorationist. This thesis examines the role geophysical inversion can assume in an integrated explo- ration program, and the impact it can have on the results. As an example, geophysical data
Paris-Sud XI, Université de
User Simulation in Dialogue Systems using Inverse Reinforcement Learning Senthilkumar Chandramohan based on Inverse Reinforcement Learning (IRL). The task of building the user simulator is perceived is an expensive process. User simulators aim at simulating human users in order to generate synthetic data
Renaut, Rosemary
at the electrodeelectrolyte interfaces of solid oxide fuel cells (SOFC) is investigated physically using Electrochemical describe the performance of a solid oxide fuel cell requires the solution of an inverse problem. TwoStability and error analysis of the polarization estimation inverse problem for solid oxide fuel
Volume Currents in Forward and Inverse MEG Simulations Using Realistic Head Models
Utah, University of
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, non-spherical realistic head model, the magnetic field normal to the MEG detector due to volume
Volume Currents in Forward and Inverse MEG Simulations Using Realistic Head Models
Utah, University of
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
A Gibbs sampler for inequality-constrained geostatistical interpolation and inverse modeling
Michalak, Anna M.
A Gibbs sampler for inequality-constrained geostatistical interpolation and inverse modeling Anna M. M. (2008), A Gibbs sampler for inequality-constrained geostatistical interpolation and inverse to inequality-constrained data and parameters. The approach is to be applicable with any variogram or covariance
Miga, Michael I.
A finite element inverse analysis to assess functional improvement during the fracture healing architecture on the FEA estimated material property metric. The finite element model inverse analysis developed i n f o Article history: Accepted 2 September 2009 Keywords: Fracture healing Finite element
Combined giant inverse and normal magnetocaloric effect for room-temperature magnetic cooling
Zexian, Cao
In the last two decades, magnetic refrigeration has been demonstrated as a very promising alternativeCombined giant inverse and normal magnetocaloric effect for room-temperature magnetic cooling Report, we report on the observation of a giant positive inverse magnetic entropy change about 28.6 J K-1
Geostatistical inverse modeling of transient pumping tests using temporal moments of drawdown
Cirpka, Olaf Arie
Geostatistical inverse modeling of transient pumping tests using temporal moments of drawdown Wei 2004; revised 22 April 2005; accepted 3 May 2005; published 2 August 2005. [1] Pumping tests belong from transient pumping tests using the quasi-linear geostatistical approach of inverse modeling
SO2 emissions and lifetimes: Estimates from inverse modeling using in situ and global, spacebased
Martin, Randall
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
Petrophysical inversion of borehole array-induction logs: Part I --Numerical examples
Torres-Verdín, Carlos
to mud-filtrate invasion. We use a rigorous formulation to account for the physics of fluid displacement in porous media resulting from water-base mud filtrate invading hydrocarbon- bearing rock formations inversion experiments using noisy synthetic wireline logs. The inversion requires a priori knowledge
PROGRESS ON A NEW EXPERIMENTAL TEST OF THE GRAVITATIONAL INVERSE-SQUARE LAW
Newman, Riley D.
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
Louis, Sushil J.
Seismic Velocity Inversion with Genetic Algorithms Sushil J. Louis Qinxue Chen Satish to compute travel times for seismic waves. However, in practice, we have to solve the inverse problem: travel synthetic seismic models shows that large population sizes are crit- ical to generating good seismic
Self-annihilation of inversion domains by high energy defects in III-Nitrides
Koukoula, T.; Kioseoglou, J., E-mail: sifisl@auth.gr; Kehagias, Th.; Komninou, Ph. [Department of Physics, Aristotle University of Thessaloniki, GR-54124 Thessaloniki (Greece); Ajagunna, A. O.; Georgakilas, A. [Microelectronics Research Group, IESL, FORTH, P.O. Box 1385, GR-71110 Heraklion, Crete, Greece and Department of Physics, University of Crete, P.O. Box 2208, GR-71003 Heraklion, Crete (Greece)
2014-04-07T23:59:59.000Z
Low-defect density InN films were grown on Si(111) by molecular beam epitaxy over an ?1??m thick GaN/AlN buffer/nucleation layer. Electron microscopy observations revealed the presence of inverse polarity domains propagating across the GaN layer and terminating at the sharp GaN/InN (0001{sup ¯}) interface, whereas no inversion domains were detected in InN. The systematic annihilation of GaN inversion domains at the GaN/InN interface is explained in terms of indium incorporation on the Ga-terminated inversion domains forming a metal bonded In-Ga bilayer, a structural instability known as the basal inversion domain boundary, during the initial stages of InN growth on GaN.
Knyazikhin, Y
2012-09-10T23:59:59.000Z
Main results are summarized for work in these areas: spectrally-invariant approximation within atmospheric radiative transfer; spectral invariance of single scattering albedo for water droplets and ice crystals at weakly absorbing wavelengths; seasonal changes in leaf area of Amazon forests from leaf flushing and abscission; and Cloud droplet size and liquid water path retrievals from zenith radiance measurements.
Direct Reservoir Parameter Estimation Using Joint Inversion ofMarine Seismic AVA&CSEM Data
Hoversten, G. Michael; Cassassuce, Florence; Gasperikova, Erika; Newman,Gregory A.; Rubin, Yoram; Zhangshuan, Hou; Vasco, Don
2005-01-12T23:59:59.000Z
A new joint inversion algorithm to directly estimate reservoir parameters is described. This algorithm combines seismic amplitude versus angle (AVA) and marine controlled source electromagnetic (CSEM) data. The rock-properties model needed to link the geophysical parameters to the reservoir parameters is described. Errors in the rock-properties model parameters, measured in percent, introduce errors of comparable size in the joint inversion reservoir parameter estimates. Tests of the concept on synthetic one-dimensional models demonstrate improved fluid saturation and porosity estimates for joint AVA-CSEM data inversion (compared to AVA or CSEM inversion alone). Comparing inversions of AVA, CSEM, and joint AVA-CSEM data over the North Sea Troll field, at a location with well control, shows that the joint inversion produces estimated gas saturation, oil saturation and porosity that is closest (as measured by the RMS difference, L1 norm of the difference, and net over the interval) to the logged values whereas CSEM inversion provides the closest estimates of water saturation.
Direct and Inverse Cascades in the Wind-Driven Sea
Zakharov, Vladimir E
2015-01-01T23:59:59.000Z
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 $\\omega^{-4}$.
Membrane filtration studies of inversely soluble model metalworking fluids
Misra, S.K.; Skoeld, R.O. [Chalmers Univ. of Technology, Gothenburg (Sweden)] [Chalmers Univ. of Technology, Gothenburg (Sweden)
1999-01-01T23:59:59.000Z
Model metalworking fluids, characterized by phase separation of functional components at elevated temperatures, were studied. Results of membrane filtration experiments with three oils of differing chemical nature confirm the feasibility of specific removal of finely dispersed contaminant oils without the simultaneous loss of active components from adequately formulated fluids. Prerequisites are that membrane materials and pore sizes be suitably chosen and that operating temperatures be kept below the cloud point of the least soluble component. The most suitable filter in the present study was a hydrophilic regenerated cellulose membrane with a NMWL of 100,000 dalton. Complete oil removal was attained if membrane pore sizes did not exceed 0.1 {micro}m. It was also found that intrinsically water-soluble boundary lubricants of the polyglycol ether type are retained by membranes in the presence of PPG-1800, which serves as a precipitation promoter above the cloud point. This is of considerable practical importance since it offers the possibility of designing water-soluble boundary lubrication and extreme pressure additives which are activated by the presence of an inversely soluble component above its cloud point. The latter compound also acts as the principal hydrodynamic lubricant of the present model formulations. The usefulness of a new analytical tool for the rapid acquisition and imaging of data pertinent to changes in molecular aggregation and phase conditions was demonstrated.
New advances in three-dimensional controlled-sourceelectromagnetic inversion
Commer, Michael; Newman, Gregory A.
2007-05-19T23:59:59.000Z
New techniques for improving both the computational andimaging performance of the three dimensional (3D) electromagnetic inverseproblem are presented. A non-linear conjugate gradient algorithm is theframework of the inversion scheme. Full wave equation modelling forcontrolled sources is utilized for data simulation along with anefficient gradient computation approach for the model update. Improvingthe modelling efficiency of the 3D finite difference method involves theseparation of the potentially large modelling mesh, defining the set ofmodel parameters, from the computational finite difference meshes usedfor field simulation. Grid spacings and thus overall grid sizes can bereduced and optimized according to source frequencies and source-receiveroffsets of a given input data set. Further computational efficiency isobtained by combining different levels of parallelization. While theparallel scheme allows for an arbitrarily large number of parallel tasks,the relative amount of message passing is kept constant. Imageenhancement is achieved by model parameter transformation functions,which enforce bounded conductivity parameters and thus prevent parameterovershoots. Further, a remedy for treating distorted data within theinversion process is presented. Data distortions simulated here includepositioning errors and a highly conductive overburden, hiding the desiredtarget signal. The methods are demonstrated using both synthetic andfield data.
Solving Inverse Detection Problems Using Passive Radiation Signatures
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
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.
Attractive Inverse Square Potential, U(1) Gauge, and Winding Transitions
Cristiano Nisoli; Alan. R. Bishop
2014-10-18T23:59:59.000Z
The inverse square potential arises in a variety of different quantum phenomena, yet notoriously it must be handled with care: it suffers from pathologies rooted in the mathematical foundations of quantum mechanics. We show that its recently studied conformality-breaking corresponds to an infinitely smooth winding-unwinding topological transition for the {\\it classical} statistical mechanics of a one-dimensional system: this describes the the tangling/untangling of floppy polymers under a biasing torque. When the ratio between torque and temperature exceeds a critical value the polymer undergoes tangled oscillations, with an extensive winding number. At lower torque or higher temperature the winding number per unit length is zero. Approaching criticality, the correlation length of the order parameter---the extensive winding number---follows a Kosterlitz-Thouless type law. The model is described by the Wilson line of a (0+1) $U(1)$ gauge theory, and applies to the tangling/untangling of floppy polymers and to the winding/diffusing kinetics in diffusion-convection-reactions.
A quantitative study of the low-level inversion in interior Alaska
Adamowicz, Peter Michael
1972-01-01T23:59:59.000Z
conditions for the study periods c. Synoptic situation for the study periods 12 12 15 5. THE ENERGY BUDGET OF THE INVERSION LAYER a. The budget equation b. Radiation theory and procedure 29 29 32 1. The radiation budget equation 2. Effect of cloud... is an important thermal process and subsidence is an important mechanical process. Examples of these different types of inversions are pre- sented in Fig. 1, which is modified from a discussion by Petterssen (1956). Fig. 1 A is a typical radiation inversion...
Rayleigh scattering and nonlinear inversion of elastic waves
Gritto, R.
1995-12-01T23:59:59.000Z
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.
Wang, Kun; Anis, Fatima; Li, Cuiping; Duric, Neb; Anastasio, Mark A
2015-01-01T23:59:59.000Z
Ultrasound computed tomography (USCT) holds great promise for improving the detection and management of breast cancer. Because they are based on the acoustic wave equation, waveform inversion-based reconstruction methods can produce images that possess improved spatial resolution properties over those produced by ray-based methods. However, waveform inversion methods are computationally demanding and have not been applied widely in USCT breast imaging. In this work, source encoding concepts are employed to develop an accelerated USCT reconstruction method that circumvents the large computational burden of conventional waveform inversion methods. This method, referred to as the waveform inversion with source encoding (WISE) method, encodes the measurement data using a random encoding vector and determines an estimate of the sound speed distribution by solving a stochastic optimization problem by use of a stochastic gradient descent algorithm. Both computer-simulation and experimental phantom studies are conduc...
Palacios Serrano, Diego G
2014-12-15T23:59:59.000Z
Seismic inversion approach has been applied with a moderate success in some siliciclastic reservoirs in Oriente Basin characterized by their prominent lateral facies variations. Different types of facies with different ...
Mesozoic tectonic inversion in the Neuquen Basin of west-central Argentina
Grimaldi Castro, Gabriel Orlando
2007-04-25T23:59:59.000Z
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 ...
Estimation of Impedance Using Seismic Reflection Data Based on Transdimensional Inversion
Dadi, Sireesh
2014-04-23T23:59:59.000Z
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...
3-D Inversion Of Borehole-To-Surface Electrical Data Using A...
Neural Network Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: 3-D Inversion Of Borehole-To-Surface Electrical Data Using A...
Kitaura, F S
2007-01-01T23:59:59.000Z
We address the inverse problem of cosmic large-scale structure reconstruction from a Bayesian perspective. For a linear data model, a number of known and novel reconstruction schemes, which differ in terms of the underlying signal prior, data likelihood, and numerical inverse extra-regularization schemes are derived and classified. The Bayesian methodology presented in this paper tries to unify and extend the following methods: Wiener-filtering, Tikhonov regularization, Ridge regression, Maximum Entropy, and inverse regularization techniques. The inverse techniques considered here are the asymptotic regularization, the Jacobi, Steepest Descent, Newton-Raphson, Landweber-Fridman, and both linear and non-linear Krylov methods based on Fletcher-Reeves, Polak-Ribiere, and Hestenes-Stiefel Conjugate Gradients. The structures of the up-to-date highest-performing algorithms are presented, based on an operator scheme, which permits one to exploit the power of fast Fourier transforms. Using such an implementation of t...
Watanabe, Shingo
2013-08-26T23:59:59.000Z
localization method to improve data assimilation performance while capturing geologic continuities that affect the flow dynamics and preserving model variability among the ensemble of models. For the streamline-based inversion method, we derived saturation...
Inversion of tracer test data using tomographic constraints Niklas Linde,1,2
Hubbard, Susan
Inversion of tracer test data using tomographic constraints Niklas Linde,1,2 Stefan Finsterle,3 be limited to field sites where this condition is partially or fully satisfied. Citation: Linde, N., S
Lin, Lin
2012-01-01T23:59:59.000Z
plus selected inversion (PEpSI) technique to Kohn-ShamThe advantage of using PEpSI is that it has a much lowercomparing the timing of PEpSI with that of diago- nalization
Kuhle, Nathan John
2001-01-01T23:59:59.000Z
Inversion of normal faults at different burial depths is studied using physical models constructed with rock and deformed at confining pressure. Models consist of a 1 cm thick limestone layer above a fault dipping 70° in a rigid medium...
Comprehensive inverse modeling for the study of carrier transport models in sub-50nm MOSFETs
Djomehri, Ihsan Jahed, 1976-
2002-01-01T23:59:59.000Z
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 ...
Sapphire decomposition and inversion domains in N-polar aluminum nitride
Hussey, Lindsay, E-mail: lkhussey@ncsu.edu; White, Ryan M.; Kirste, Ronny; Bryan, Isaac; Guo, Wei; Osterman, Katherine; Haidet, Brian; Bryan, Zachary; Bobea, Milena; Collazo, Ramón; Sitar, Zlatko [Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695-7919 (United States); Mita, Seiji [HexaTech, Inc., 991 Aviation Pkwy, Suite 800, Morrisville, North Carolina 27560 (United States)
2014-01-20T23:59:59.000Z
Transmission electron microscopy (TEM) techniques and potassium hydroxide (KOH) etching confirmed that inversion domains in the N-polar AlN grown on c-plane sapphire were due to the decomposition of sapphire in the presence of hydrogen. The inversion domains were found to correspond to voids at the AlN and sapphire interface, and transmission electron microscopy results showed a V-shaped, columnar inversion domain with staggered domain boundary sidewalls. Voids were also observed in the simultaneously grown Al-polar AlN, however no inversion domains were present. The polarity of AlN grown above the decomposed regions of the sapphire substrate was confirmed to be Al-polar by KOH etching and TEM.
The disordered inverse opal architecture validates the theoretical model that predicts the diffusion, operated by the Alliance for Sustainable Energy, LLC. 15013 Denver West Parkway | Golden, CO 80401 | 303
Mass, heat and nutrient fluxes in the Atlantic Ocean determined by inverse methods
Rintoul, Stephen R. (Stephen Rich)
1988-01-01T23:59:59.000Z
Inverse methods are applied to historical hydrographic data to address two aspects of the general circulation of the Atlantic Ocean. The method allows conservation statements for mass and other properties, along with a ...
Locatelli, R.
A modelling experiment has been conceived to assess the impact of transport model errors on methane emissions estimated in an atmospheric inversion system. Synthetic methane observations, obtained from 10 different model ...
Nitrous oxide emissions 1999 to 2009 from a global atmospheric inversion
Thompson, R. L.
N[subscript 2]O surface fluxes were estimated for 1999 to 2009 using a time-dependent Bayesian inversion technique. Observations were drawn from 5 different networks, incorporating 59 surface sites and a number of ship-based ...
Carbon flow and ecosystem dynamics in the Mississippi River plume described by inverse analysis
Breed, Greg Allen
2002-01-01T23:59:59.000Z
for the degree of MASTER OF SCIENCE December 2002 Major Subject: Oceanography CARBON FLOW AND ECOSYSTEM DYNAMICS IN THE MISSISSIPPI RIVER PLUME DESCRIBED BY INVERSE ANALYSIS A Thesis by GREG ALLEN BREED Submitted to Texas A&M University in partial... of Department) December 2002 Major Sublect: Oceanography ABSTRACT Carbon Flow and Ecosystem Dynamics in the Mississippi River Plume Described by Inverse Analysis. (December 2002) Greg Allen Breed, B. S. , University of Minnesota Chair of Advisory...
EDDY CURRENT INVERSION AND ESTIMATION METRICS FOR EVALUATING THERMAL BARRIER COATINGS
Sabbagh, Harold A.; Murphy, R. Kim; Sabbagh, Elias H. [Victor Technologies LLC, Bloomington, IN 47401 (United States); Knopp, Jeremy S. [Air Force Research Laboratory, Wright-Patterson AFB, OH 45433 (United States); Aldrin, John C. [Computational Tools, Gurnee, IL 60031 (United States); Nyenhuis, John [Dept. of Electric Computer Engineering, Purdue University, West Lafayette, IN (United States)
2010-02-22T23:59:59.000Z
In this paper, sophisticated eddy-current techniques incorporating model-based inverse methods were successfully demonstrated to measure the thickness and remaining-life of high-temperature coatings. To further assure the performance of these inverse methods, several estimation metrics including Fisher Information, Cramer-Rao Lower Bound (CRLB), covariance, and singular value decomposition (SVD) are introduced. The connections and utility of these metrics are illustrated in the design of eddy current methods for estimating layer thickness, conductivity and probe liftoff.
Phillips, Mike Randall
1993-01-01T23:59:59.000Z
A PARALLEL SOLUTION OF THE INVERSE PROBLEM ASSOCIATED WITH A HYPERBOLIC PARTIAL DIFFERENTIAL EQUATION A Thesis by MIKE RANDALL PHILLIPS Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE May 1993 Major Subject: Computer Science A PARALLEL SOLUTION OF THE INVERSE PROBLEM ASSOCIATED WITH A HYPERBOLIC PARTIAL DIFFERENTIAL EQUATION A Thesis by MIKE RANDALL PHILLIPS Approved as to style...
Development of a Cox-Thompson inverse scattering method to charged particles
Tamas Palmai; Barnabas Apagyi; Werner Scheid
2011-11-25T23:59:59.000Z
A Cox-Thompson fixed-energy quantum inverse scattering method is developed further to treat long-range Coulomb interaction. Depending on the reference potentials chosen, two methods have been formulated which produce inverse potentials with singular or finite value at the origin. Based on the quality of reproduction of input experimental phase shifts, it is guessed that the p-alpha interaction possesses an interesting repulsive hard core.
A Unified Approach to Various Techniques for the Nonuniqueness of the Inverse Gravimetric Problem
Âposed 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
The Quasi-Reversibility Method for the Thermoacoustic Tomography and a Coefficient Inverse Problem
Klibanov, Michael V; Nechaev, Dmitriy V; Kuzhuget, Andrey V
2007-01-01T23:59:59.000Z
An inverse problem of the determination of an initial condition in a hyperbolic equation from the lateral Cauchy data is considered. This problem has applications to the thermoacoustic tomography, as well as to linearized coefficient inverse problems of acoustics and electromagnetics. A new version of the quasi-reversibility method is described. This version requires a new Lipschitz stability estimate, which is obtained via the Carleman estimate. Numerical results are presented.
The Quasi-Reversibility Method for the Thermoacoustic Tomography and a Coefficient Inverse Problem
Michael V Klibanov; Sergey I Kabanikhin; Dmitriy V Nechaev; Andrey V Kuzhuget
2007-12-02T23:59:59.000Z
An inverse problem of the determination of an initial condition in a hyperbolic equation from the lateral Cauchy data is considered. This problem has applications to the thermoacoustic tomography, as well as to linearized coefficient inverse problems of acoustics and electromagnetics. A new version of the quasi-reversibility method is described. This version requires a new Lipschitz stability estimate, which is obtained via the Carleman estimate. Numerical results are presented.
Schuh, Andrew E.; Lauvaux, Thomas; West, Tristram O.; Denning, A.; Davis, Kenneth J.; Miles, Natasha; Richardson, S. J.; Uliasz, Marek; Lokupitiya, Erandathie; Cooley, Dan; Andrews, Arlyn; Ogle, Stephen
2013-05-01T23:59:59.000Z
An intensive regional research campaign was conducted by the North American Carbon Program (NACP) in 2005 to study the carbon cycle of the highly productive agricultural regions of the Midwestern United States. Forty-_ve di_erent associated projects were spawned across _ve U.S. agencies over the course of nearly a decade involving hundreds of researchers. The primary objective of the project was to investigate the ability of atmospheric inversion techniques to use highly calibrated CO2 mixing ratio data to estimate CO2 exchange over the major croplands of the U.S. Statistics from densely monitored crop production, consisting primarily corn and soybeans, provided the backbone of a well-studied\\bottom up"flux estimate that was used to evaluate the atmospheric inversion results. Three different inversion systems, representing spatial scales varying from high resolution mesoscale, to continental, to global, coupled to different transport models and optimization techniques were compared to the bottom up" inventory estimates. The mean annual CO2-C sink for 2007 from the inversion systems ranged from 120 TgC to 170 TgC, when viewed across a wide variety of inversion setups, with the best" point estimates ranging from 145 TgC to 155 TgC. Inversion-based mean C sink estimates were generally slightly stronger, but statistically indistinguishable,from the inventory estimate whose mean C sink was 135 TgC. The inversion results showed temporal correlations at seasonal lengths while week to week correlations remained low. Comparisons were made between atmospheric transport yields of the two regional inversion systems, which despite having different influence footprints in space and time due to differences in underlying transport models and external forcings, showed similarity when aggregated in space and time.
Spatially-Variant Tikhonov Regularization for Double-Difference Waveform Inversion
Lin, Youzuo [Los Alamos National Laboratory; Huang, Lianjie [Los Alamos National Laboratory; Zhang, Zhigang [Los Alamos National Laboratory
2011-01-01T23:59:59.000Z
Double-difference waveform inversion is a potential tool for quantitative monitoring for geologic carbon storage. It jointly inverts time-lapse seismic data for changes in reservoir geophysical properties. Due to the ill-posedness of waveform inversion, it is a great challenge to obtain reservoir changes accurately and efficiently, particularly when using time-lapse seismic reflection data. Regularization techniques can be utilized to address the issue of ill-posedness. The regularization parameter controls the smoothness of inversion results. A constant regularization parameter is normally used in waveform inversion, and an optimal regularization parameter has to be selected. The resulting inversion results are a trade off among regions with different smoothness or noise levels; therefore the images are either over regularized in some regions while under regularized in the others. In this paper, we employ a spatially-variant parameter in the Tikhonov regularization scheme used in double-difference waveform tomography to improve the inversion accuracy and robustness. We compare the results obtained using a spatially-variant parameter with those obtained using a constant regularization parameter and those produced without any regularization. We observe that, utilizing a spatially-variant regularization scheme, the target regions are well reconstructed while the noise is reduced in the other regions. We show that the spatially-variant regularization scheme provides the flexibility to regularize local regions based on the a priori information without increasing computational costs and the computer memory requirement.
Three-dimensional electromagnetic modeling and inversion on massively parallel computers
Newman, G.A.; Alumbaugh, D.L. [Sandia National Labs., Albuquerque, NM (United States). Geophysics Dept.
1996-03-01T23:59:59.000Z
This report has demonstrated techniques that can be used to construct solutions to the 3-D electromagnetic inverse problem using full wave equation modeling. To this point great progress has been made in developing an inverse solution using the method of conjugate gradients which employs a 3-D finite difference solver to construct model sensitivities and predicted data. The forward modeling code has been developed to incorporate absorbing boundary conditions for high frequency solutions (radar), as well as complex electrical properties, including electrical conductivity, dielectric permittivity and magnetic permeability. In addition both forward and inverse codes have been ported to a massively parallel computer architecture which allows for more realistic solutions that can be achieved with serial machines. While the inversion code has been demonstrated on field data collected at the Richmond field site, techniques for appraising the quality of the reconstructions still need to be developed. Here it is suggested that rather than employing direct matrix inversion to construct the model covariance matrix which would be impossible because of the size of the problem, one can linearize about the 3-D model achieved in the inverse and use Monte-Carlo simulations to construct it. Using these appraisal and construction tools, it is now necessary to demonstrate 3-D inversion for a variety of EM data sets that span the frequency range from induction sounding to radar: below 100 kHz to 100 MHz. Appraised 3-D images of the earth`s electrical properties can provide researchers opportunities to infer the flow paths, flow rates and perhaps the chemistry of fluids in geologic mediums. It also offers a means to study the frequency dependence behavior of the properties in situ. This is of significant relevance to the Department of Energy, paramount to characterizing and monitoring of environmental waste sites and oil and gas exploration.
Mernild, Sebastian Haugard [Los Alamos National Laboratory; Liston, Glen [COLORADO STATE UNIV.
2009-01-01T23:59:59.000Z
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.
Inverse Process Analysis for the Acquisition of Thermophysical Data
Jay Frankel (UTK); Adrian Sabau (UTK)
2004-10-31T23:59:59.000Z
One of the main barriers in the analysis and design of materials processing and industrial applications is the lack of accurate experimental data on the thermophysical properties of materials. To date, the measurement of most of these high-temperature thermophysical properties has often been plagued by temperature lags that are inherent in measurement techniques. These lags can be accounted for with the appropriate mathematical models, reflecting the experimental apparatus and sample region, in order to deduce the desired measurement as a function of true sample temperature. Differential scanning calorimeter (DSC) measurements are routinely used to determine enthalpies of phase change, phase transition temperatures, glass transition temperatures, and heat capacities. In the aluminum, steel, and metal casting industries, predicting the formation of defects such as shrinkage voids, microporosity, and macrosegregation is limited by the data available on fraction solid and density evolution during solidification. Dilatometer measurements are routinely used to determine the density of a sample at various temperatures. An accurate determination of the thermophysical properties of materials is needed to achieve accuracy in the numerical simulations used to improve or design new material processes. In most of the instruments used to measure properties, the temperature is changed according to instrument controllers and there is a nonhomogeneous temperature distribution within the instrument. Additionally, the sample temperature cannot be measured directly: temperature data are collected from a thermocouple that is placed at a different location than that of the sample, thus introducing a time lag. The goal of this project was to extend the utility, quality and accuracy of two types of commercial instruments -a DSC and a dilatometer - used for thermophysical property measurements in high-temperature environments. In particular, the quantification of solid fraction and density during solidification was deemed of critical importance. To accomplish this project goal, we redesigned sample holders and developed inverse mathematical methods to account for system lags. The desired property could then be correlated to the proper sample temperature. For the NETZSCH DSC 404C instrument with a high-accuracy heat capacity sensor, a mathematical model was developed by assuming that each component was isothermal and that the heat transfer among components occurred by conduction and radiation. Model parameters included effective conduction time constants and radiation time constants. Several model cases were investigated to assess the effect of heat transfer interactions. New features that have not been considered in previous DSC models were included in the present study. These new features included (a) considering the sensor platform, (b) accounting for the heat loss through the stem, and (c) considering the lag between furnace temperature and set point temperature. Comparisons with experimental results showed that temperature lags in heat flux DSC instruments could be determined by performing a heat transfer analysis based on a comprehensive model. The proposed mathematical model yielded accurate results over a wide temperature range during heating and cooling regimes. The induced thermal lag in the Theta Industries dual push-rod horizontal dilatometer is apparent owing to the distance of the thermocouple from the actual sample. In a near steady-state mode of operation, this apparent problem is minimal. However, in a transient situation, where the density is varying as a function of time, the temperature output from the remote temperature sensor must be adjusted in order to reflect the sample temperature. The conventional push-rod dilatometer insert was modified significantly to allow an accurate correlation of the measured density to the predicted sample temperature of alloys in the phase-change regime. This new configuration made use of a standard furnace assembly; however, the specimen was symmetrically encased in a well-instrumented cylind
Interlocked optimization and fast gradient algorithm for a seismic inverse problem
Metivier, Ludovic, E-mail: ludovic.metivier@gmail.com [LAGA, Universite Paris XIII, 99 Avenue Jean-Baptiste Clement, 93000 Epinay-Villetaneuse (France)
2011-08-10T23:59:59.000Z
Highlights: {yields} A 2D extension of the 1D nonlinear inversion of well-seismic data is given. {yields} Appropriate regularization yields a well-determined large scale inverse problem. {yields} An interlocked optimization loop acts as an efficient preconditioner. {yields} The adjoint state method is used to compute the misfit function gradient. {yields} Domain decomposition method yields an efficient parallel implementation. - Abstract: We give a nonlinear inverse method for seismic data recorded in a well from sources at several offsets from the borehole in a 2D acoustic framework. Given the velocity field, approximate values of the impedance are recovered. This is a 2D extension of the 1D inversion of vertical seismic profiles . The inverse problem generates a large scale undetermined ill-conditioned problem. Appropriate regularization terms render the problem well-determined. An interlocked optimization algorithm yields an efficient preconditioning. A gradient algorithm based on the adjoint state method and domain decomposition gives a fast parallel numerical method. For a realistic test case, convergence is attained in an acceptable time with 128 processors.
Shan, L.; Vincent, J.; Brunzelle, J.S.; Dussault, I.; Lin, M.; Ianculescu, I.; Sherman, M.A.; Forman, B.M.; Fernandez, E. (Tennesse)
2010-03-08T23:59:59.000Z
The nuclear receptor CAR is a xenobiotic responsive transcription factor that plays a central role in the clearance of drugs and bilirubin while promoting cocaine and acetaminophen toxicity. In addition, CAR has established a 'reverse' paradigm of nuclear receptor action where the receptor is active in the absence of ligand and inactive when bound to inverse agonists. We now report the crystal structure of murine CAR bound to the inverse agonist androstenol. Androstenol binds within the ligand binding pocket, but unlike many nuclear receptor ligands, it makes no contacts with helix H12/AF2. The transition from constitutive to basal activity (androstenol bound) appears to be associated with a ligand-induced kink between helices H10 and H11. This disrupts the previously predicted salt bridge that locks H12 in the transcriptionally active conformation. This mechanism of inverse agonism is distinct from traditional nuclear receptor antagonists thereby offering a new approach to receptor modulation.
Gehre, Matthias, E-mail: mgehre@math.uni-bremen.de [Center for Industrial Mathematics, University of Bremen, Bremen D-28344 (Germany)] [Center for Industrial Mathematics, University of Bremen, Bremen D-28344 (Germany); Jin, Bangti, E-mail: bangti.jin@gmail.com [Department of Mathematics, University of California, Riverside, University Ave. 900, Riverside, CA 92521 (United States)] [Department of Mathematics, University of California, Riverside, University Ave. 900, Riverside, CA 92521 (United States)
2014-02-15T23:59:59.000Z
In this paper, we study a fast approximate inference method based on expectation propagation for exploring the posterior probability distribution arising from the Bayesian formulation of nonlinear inverse problems. It is capable of efficiently delivering reliable estimates of the posterior mean and covariance, thereby providing an inverse solution together with quantified uncertainties. Some theoretical properties of the iterative algorithm are discussed, and the efficient implementation for an important class of problems of projection type is described. The method is illustrated with one typical nonlinear inverse problem, electrical impedance tomography with complete electrode model, under sparsity constraints. Numerical results for real experimental data are presented, and compared with that by Markov chain Monte Carlo. The results indicate that the method is accurate and computationally very efficient.
SREELS analysis of oxygen-rich inversion domain boundaries in aluminum nitride
Bruley, J.; Zhao, J.C.; Notis, M.R. [Lehigh Univ. Bethlehem, PA (United States). Dept. of Materials Science and Engineering; Westwood, A.D. [IBM T.J. Watson Research Center, Yorktown Heights, NY (United States); Youngman, R.A. [Carborundum Co., Phoenix, AZ (United States)
1995-09-01T23:59:59.000Z
Spatially resolved electron energy loss spectroscopy analysis has been conducted on planar inversion domain boundaries in aluminum nitride. The defects were found to contain 1.5 monolayers of oxygen, in agreement with the most recent structural model of Westwood. From variations in near-edge structure, the local atomic environments of both oxygen and aluminum are compared with {alpha}-Al{sub 2}O{sub 3}, {gamma}-Al{sub 2}O{sub 3} and {gamma}-AlON standards. Based upon this study the structure of the inversion domain boundary is found to resemble that of the cubic {gamma}-AlON spinel, and eliminates from consideration those structural models based upon {alpha}-Al{sub 2}O{sub 3}. Furthermore, quantification of the shape resonances provided Al-O bond-length data from the inversion domain boundary interface. These distances closely agree with the Youngman Model that has recently been further refined by Westwood et al.
Zhu, Lin; Gong, Huili; Gable, Carl; Teatini, Pietro
2015-01-01T23:59:59.000Z
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...
Experimental validation of GADRAS's coupled neutron-photon inverse radiation transport solver.
Mattingly, John K.; Mitchell, Dean James; Harding, Lee T.
2010-08-01T23:59:59.000Z
Sandia National Laboratories has developed an inverse radiation transport solver that applies nonlinear regression to coupled neutron-photon deterministic transport models. The inverse solver uses nonlinear regression to fit a radiation transport model to gamma spectrometry and neutron multiplicity counting measurements. The subject of this paper is the experimental validation of that solver. This paper describes a series of experiments conducted with a 4.5 kg sphere of {alpha}-phase, weapons-grade plutonium. The source was measured bare and reflected by high-density polyethylene (HDPE) spherical shells with total thicknesses between 1.27 and 15.24 cm. Neutron and photon emissions from the source were measured using three instruments: a gross neutron counter, a portable neutron multiplicity counter, and a high-resolution gamma spectrometer. These measurements were used as input to the inverse radiation transport solver to evaluate the solver's ability to correctly infer the configuration of the source from its measured radiation signatures.
Chen, J.; Hoversten, G.M.
2011-09-15T23:59:59.000Z
Joint inversion of seismic AVA and CSEM data requires rock-physics relationships to link seismic attributes to electrical properties. Ideally, we can connect them through reservoir parameters (e.g., porosity and water saturation) by developing physical-based models, such as Gassmann’s equations and Archie’s law, using nearby borehole logs. This could be difficult in the exploration stage because information available is typically insufficient for choosing suitable rock-physics models and for subsequently obtaining reliable estimates of the associated parameters. The use of improper rock-physics models and the inaccuracy of the estimates of model parameters may cause misleading inversion results. Conversely, it is easy to derive statistical relationships among seismic and electrical attributes and reservoir parameters from distant borehole logs. In this study, we develop a Bayesian model to jointly invert seismic AVA and CSEM data for reservoir parameter estimation using statistical rock-physics models; the spatial dependence of geophysical and reservoir parameters are carried out by lithotypes through Markov random fields. We apply the developed model to a synthetic case, which simulates a CO{sub 2} monitoring application. We derive statistical rock-physics relations from borehole logs at one location and estimate seismic P- and S-wave velocity ratio, acoustic impedance, density, electrical resistivity, lithotypes, porosity, and water saturation at three different locations by conditioning to seismic AVA and CSEM data. Comparison of the inversion results with their corresponding true values shows that the correlation-based statistical rock-physics models provide significant information for improving the joint inversion results.
Numerical solution of 2-D nonlinear inverse heat conduction problems using finite-element techniques
Khachfe, R.A.; Jarny, Y.
2000-02-01T23:59:59.000Z
A general method is presented for solving different classes of nonlinear inverse heat conduction problems (IHCP) for two-dimensional, arbitrarily shaped bodies. It is based on the systematic use of a finite-element library. It is shown that, following this approach, the conjugate gradient method can be easily implemented. The method offers a very wide field of practical applications in inverse thermal analysis, while reducing very significantly the amount of work which remains specific for each particular IHPC. Two numerical experiments illustrate the influence of data errors and the iterative regularization principle.
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
The inverse scattering transform for the focusing nonlinear Schrödinger 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.
Analysis of forward and inverse problems in chemical dynamics and spectroscopy
Rabitz, H. [Princeton Univ., NJ (United States)
1993-12-01T23:59:59.000Z
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.
Statistical method for resolving the photon-photoelectron-counting inversion problem
Wu Jinlong [LMAM and School of Mathematical Sciences, Peking University, Beijing 100871 (China); Li Tiejun, E-mail: tieli@pku.edu.c [LMAM and School of Mathematical Sciences, Peking University, Beijing 100871 (China); Peng, Xiang, E-mail: xiangpeng@pku.edu.c [CREAM Group, State Key Laboratory of Advanced Optical Communication Systems and Networks (Peking University) and Institute of Quantum Electronics, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871 (China); Guo Hong, E-mail: hongguo@pku.edu.c [CREAM Group, State Key Laboratory of Advanced Optical Communication Systems and Networks (Peking University) and Institute of Quantum Electronics, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871 (China)
2011-02-01T23:59:59.000Z
A statistical inversion method is proposed for the photon-photoelectron-counting statistics in quantum key distribution experiment. With the statistical viewpoint, this problem is equivalent to the parameter estimation for an infinite binomial mixture model. The coarse-graining idea and Bayesian methods are applied to deal with this ill-posed problem, which is a good simple example to show the successful application of the statistical methods to the inverse problem. Numerical results show the applicability of the proposed strategy. The coarse-graining idea for the infinite mixture models should be general to be used in the future.
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; H. E. Swanson
2006-11-14T23:59:59.000Z
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.
Sóbester, András
6/10/12 The use of acoustic inversion to estimate the bubble size distribution in pipelines 1 address ... yes . . . The use of acoustic inversion to estimate the bubble size distribution in pipelines devised a new method to more accurately measure gas bubbles in pipelines. The ability to measure gas
Davis, Jean-Paul
2005-03-01T23:59:59.000Z
INVICE (INVerse analysis of Isentropic Compression Experiments) is a FORTRAN computer code that implements the inverse finite-difference method to analyze velocity data from isentropic compression experiments. This report gives a brief description of the methods used and the options available in the first beta version of the code, as well as instructions for using the code.
Pedicini, Marco
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
Abstract--In this work, we first introduced a reorganized form of the Novikov's inversion formula) applying the reorganized Novikov's formula. Numerical evaluations demonstrated its computational efficiency the attenuated Radon transform (AtRT). A closed- form inversion formula for parallel-beam (PB) geometry
Stability of the numerical method of solving the 3D inverse scattering problem with fixed- energy Collections Journals About Contact us My IOPscience #12;Inverse Problems 6 (1990) L7-LI2. Printed in the UK with fixed-energy data A G Ramm Mathematics Department, Kansas State University, Manhattan, KS 66506, USA
RNAiFold: A web server for RNA inverse folding and molecular Juan Antonio Garcia-Martin, Peter Clote
Clote, Peter
RNAiFold: A web server for RNA inverse folding and molecular design Juan Antonio Garcia title: RNAiFold web server Key words: RNA, inverse folding, molecular design, synthetic biology, RNA to the 21st century. In this paper, we describe a new web server to support in silico RNA molecular design
Boyer, Edmond
1 Gravity inversion, AMS and geochronological investigations of syntectonic granitic plutons gravity inversion does not show any evidence of rooting of the granites along the SHF. Therefore, despite tectonic framework rather than local faulting as a factor controlling pluton emplacement. Keywords: granite
Marschner, Steve
Presented at the IS&T/SID Fifth Color Imaging Conference, November 1997 Inverse Lighting, New York Abstract We introduce a technique for improving photographs using inverse lighting, a new process based on algorithms develÂ oped in computer graphics for computing the reflection of light in 3D
K-space reconstruction of magnetic resonance inverse imaging (K-InI) of human visuomotor systems
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
Wang, Liqiang
Rapid 3D Seismic Source Inversion Using Windows Azure and Amazon EC2 Vedaprakash Subramanian seismic source inversion on both cluster (specif- ically, MPI-based) and cloud computing (specifically to seismic source in- version is feasible and has its advantages. In addition, we notice that both cluster
Torres-VerdÃn, Carlos
High-resolution geostatistical inversion of a seismic data set acquired in a Gulf of Mexico gas, UNOCAL Corporation Summary Geostatistical inversion is applied on a Gulf-of-Mexico, 3D post-stack seismic in this paper is located in the Gulf of Mexico, off the coast of Louisiana. Existing development wells reach two
Krakauer, Nir Y.
Influence of reduced carbon emissions and oxidation on the distribution of atmospheric CO2 carbon emission and oxidation processes in deriving inversion estimates of CO2 surface fluxes. Citation carbon emissions and oxidation on the distribution of atmospheric CO2: Implications for inversion
2001 -4380 -0 Aerospace EngineeringIto, Ward, and Valasek ROBUST DYNAMIC INVERSION
Valasek, John
2001 - 4380 - 0 Aerospace EngineeringIto, Ward, and Valasek ROBUST DYNAMIC INVERSION CONTROLLER DESIGN FOR THE X-38 AIAA-2001-4380 Dai Ito, Dr. Donald T. Ward, and Dr. John Valasek Aerospace Engineering AIAA GN&C Conference, Montreal, Canada 9 August 2001 #12;2001 - 4380 - 1 Aerospace Engineering
ACOUSTIC IMPEDANCE INVERSION FOR STATIC AND DYNAMIC CHARACTERIZATION OF A CO2 EOR PROJECT,
ACOUSTIC IMPEDANCE INVERSION FOR STATIC AND DYNAMIC CHARACTERIZATION OF A CO2 EOR PROJECT, POSTLE of the CO2 flood performance at Postle field. The use of traditional P-wave reflectivity data correlate to the roll-out of the CO2 flood program from south to north. When interpreted in conjunction
Current Distribution Models for the Earth's Main Magnetic Field: A Discrete Inverse Theory Approach
Sewards, Terence V
2008-01-01T23:59:59.000Z
Current source models for the Earth's main geomagnetic field are calculated employing conventional discrete inverse theory methods. Source structures are spherical surfaces placed at the surface of the Earth's core, and at the surface of the Earth. The data set consists of measurements taken by the MAGSAT satellite in 1979. The resulting current distributions are discussed in relation to dipole and current loop models.
Inverse optimization techniques for targeted self-assembly Salvatore Torquato*ab
Torquato, Salvatore
that we have devised to optimize interaction potentials in soft matter systems that correspond to stable may represent entirely new structural motifs. Soft matter systems, such as colloids and polymers 2009 DOI: 10.1039/b814211b This article reviews recent inverse statistical-mechanical methodologies
COMPRESSIVE INVERSE SCATTERING I. HIGH FREQUENCY SIMO/MISO AND MIMO MEASUREMENTS
Fannjiang, Albert
COMPRESSIVE INVERSE SCATTERING I. HIGH FREQUENCY SIMO/MISO AND MIMO MEASUREMENTS ALBERT C), multiple-input-single-output (MISO) or multiple-input-multiple-output (MIMO) measurements is analyzed of the data either with the MIMO measurement for the Born scattering or with the SIMO/MISO measurement
van Milligen, Boudewijn
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
6.6 Solute Transport During Variably Saturated Flow--Inverse Methods
Flury, Markus
6.6 Solute Transport During Variably Saturated Flow-- Inverse Methods JIÃ?Ã SIMÃ¦NEK AND MARTINUS TH.6.2). In separate lines of research, solute transport parameters are often obtained from column experiments assuming curves. Obtaining solute transport pa- rameters for conditions for which no analytical solutions exist
Sufficient reductions in regressions with elliptically contoured1 inverse predictors2
Bura, Efstathia
for21 the regression of Y on X comprises of a linear and a non-linear component.22 1 Introduction23 There are two general approaches based on inverse regression for estimating the linear sufficient9 reductions with18 parameters (µY , ) and density gY , there is no linear non-trivial sufficient reduction except
Collett Jr., Jeffrey L.
Evaluating atmospheric CO2 inversions at multiple scales over a highly inventoried agricultural the results to an inventory of CO2 fluxes. Statistics from densely monitored crop production, consisting primarily of corn and soybeans, provided the backbone of a well studied bottom-up inventory flux estimate
Inverse modeling of European CH4 emissions 20012006 P. Bergamaschi,1
Haak, Hein
for the total anthropogenic emissions from NWE are 21% higher compared to the EDGARv4.0 emission inventory us from verifying (or falsifying) the bottomup inventories in a strict sense. Sensitivity studies bottomup inventories, a further sensitivity inversion without this a priori information results in very
On an inverse problem: the recovery of non-smooth solutions to backward heat equation
Daripa, Prabir
On an inverse problem: the recovery of non-smooth solutions to backward heat equation Fabien Ternat solu- tions of backward heat equation. In this paper, we test the viability of using these techniques to recover non-smooth solutions of backward heat equation. In particular, we numerically integrate
Regional NO2 emission inversion through four-dimensional variational approach using
Sandu, Adrian
Regional NO2 emission inversion through four-dimensional variational approach using SCIAMACHY CHartographY) satellite observa- tions. In this paper, the NOx emission scaling factors applied over 2001 Na- tional Emissions Inventory(NEI) are estimated through a four-dimensional variational (4D-Var) approach
Inversion tectonics during continental rifting: The Turkana Cenozoic rifted zone, northern Kenya
Brest, UniversitÃ© de
Inversion tectonics during continental rifting: The Turkana Cenozoic rifted zone, northern Kenya B of inverted deformation within Miocene-Recent basins of the Turkana rift (northern Kenya) in the eastern: The Turkana Cenozoic rifted zone, northern Kenya, Tectonics, 24, TC2002, doi:10.1029/2004TC001637. 1
Inverse Modeling Using a Wireless Sensor Network (WSN) for Personalized Daylight Harvesting
Agogino, Alice M.
Inverse Modeling Using a Wireless Sensor Network (WSN) for Personalized Daylight Harvesting Ryan: predictive: daylight harvesting: piecewise linear regression: building energy efficiency Abstract: Smart light levels, discretized by sub-hourly sun angles. Applied on two days of daylight and ten days
Rheology of welding: inversion of field constraints James K. Russell*, Steven L. Quane
Russell, Kelly
Rheology of welding: inversion of field constraints James K. Russell*, Steven L. Quane Igneous the mechanisms and rheological behaviour of pyroclastic deposits during welding and compaction are poorly are constrained by physical property distributions in welded ignimbrite. Physical properties of samples from a 20
Inversion of wurtzite GaN(0001) by exposure to V. Ramachandran and R. M. Feenstra
Feenstra, Randall
1 Inversion of wurtzite GaN(0001) by exposure to magnesium V. Ramachandran and R. M. Feenstra 15213 Abstract Magnesium incorporation during the molecular beam epitaxy growth of wurtzite GaN is found important. Most devices are built on the polar basal plane of wurtzite GaN, and the characteristics
WAVELET BASED INVERSION OF POTENTIAL FIELD DATA Registration number F035
Boschetti, Fabio
WAVELET BASED INVERSION OF POTENTIAL FIELD DATA Registration number F035 F. Boschetti, P. Hornby@ned.dem.csiro.au ABSTRACT By analysing potential field data in the wavelet domain and performing a multi scale edge importantly, with the use of an appropriate wavelet, defined by the physics of the problem, information about
The $B-L$ Supersymmetric Standard Model with Inverse Seesaw at the Large Hadron Collider
Khalil, S
2015-01-01T23:59:59.000Z
We review the TeV scale $B-L$ extension of the Minimal Supersymmetric Standard Model (BLSSM) where an inverse seesaw mechanism of light neutrino mass generation is naturally implemented and concentrate on its hallmark manifestations at the Large Hadron Collider (LHC).
An inversion formula for transport equation in 3-dimensions using several complex variable analysis
Seyed Majid Saberi Fathi
2015-03-18T23:59:59.000Z
In this paper, the photon stationary transport equation has been extended from $\\mathbb{R}^3$ to $\\mathbb{C}^3$. A solution of the inverse problem is obtained on a hyper-sphere and a hyper-cylinder as X-ray and Radon transform, respectively. We show that these results can be transformed into each other and they agree with known results.
IMPROVED SEARCH OF PRINCIPAL COMPONENT ANALYSIS DATABASES FOR SPECTRO-POLARIMETRIC INVERSION
Casini, R.; Lites, B. W. [High Altitude Observatory, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 (United States); Ramos, A. Asensio [Instituto de Astrofisica de Canarias, c/Via Lactea s/n, E-38205 La Laguna, Tenerife (Spain); Ariste, A. Lopez [THEMIS, CNRS UPS 853, c/Via Lactea s/n, E-38200 La Laguna, Tenerife (Spain)
2013-08-20T23:59:59.000Z
We describe a simple technique for the acceleration of spectro-polarimetric inversions based on principal component analysis (PCA) of Stokes profiles. This technique involves the indexing of the database models based on the sign of the projections (PCA coefficients) of the first few relevant orders of principal components of the four Stokes parameters. In this way, each model in the database can be attributed a distinctive binary number of 2{sup 4n} bits, where n is the number of PCA orders used for the indexing. Each of these binary numbers (indices) identifies a group of ''compatible'' models for the inversion of a given set of observed Stokes profiles sharing the same index. The complete set of the binary numbers so constructed evidently determines a partition of the database. The search of the database for the PCA inversion of spectro-polarimetric data can profit greatly from this indexing. In practical cases it becomes possible to approach the ideal acceleration factor of 2{sup 4n} as compared to the systematic search of a non-indexed database for a traditional PCA inversion. This indexing method relies on the existence of a physical meaning in the sign of the PCA coefficients of a model. For this reason, the presence of model ambiguities and of spectro-polarimetric noise in the observations limits in practice the number n of relevant PCA orders that can be used for the indexing.
DeLucia, Evan H.
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
Selection of desired dynamics for Dynamic Inversion controlled re-entry vehicles
Georgie, Jennifer Anne
2001-01-01T23:59:59.000Z
the dynamic inversion inner-loop to provide closed-loop stability. The resulting closed-loop performance is then evaluated in the time domain, in terms of singular values in the frequency domain, a quadratic cost, and a passenger ride comfort index. A set...
Inverse Beta Decay in a Nonequilibrium Antineutrino Flux from a Nuclear Reactor
V. I. Kopeikin; L. A. Mikaelyan; V. V. Sinev
2001-10-23T23:59:59.000Z
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.
Topological insulators with inversion symmetry Liang Fu and C. L. Kane
Kane, Charles
Topological insulators with inversion symmetry Liang Fu and C. L. Kane Department of Physics; revised manuscript received 17 January 2007; published 2 July 2007 Topological insulators are materials insulators. This distinction is characterized by Z2 topological invariants, which characterize the ground
INVERSE PROBLEMS FOR A CLASS OF MEASURE DEPENDENT DYNAMICAL H. T. BANKS
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
Nonlinear inverse problem for a model of ion-exchange filter: numerical recovery of parameters
) and pressure (15 MPa) of hot steam [2]. Some units are made of cheap corrosion and heat-resistant steel which1 Nonlinear inverse problem for a model of ion-exchange filter: numerical recovery of parameters]. Power-generating units of TPP operate under severe corrosive conditions: high temperature (515 - 530°C
Duris, J.; Li, R. K.; Musumeci, P.; Sakai, Y.; Threlkeld, E.; Williams, O.; Fedurin, M.; Kusche, K.; Pogorelsky, I.; Polyanskiy, M.; Yakimenko, V. [UCLA Department of Physics and Astronomy, Los Angeles, CA 90095 (United States); Accelerator Test Facility, Brookhaven National Laboratory, Upton, NY, 11973 (United States)
2012-12-21T23:59:59.000Z
Preparations for an inverse free electron laser experiment at Brookhaven National Laboratory's Accelerator Test Facilty are presented. Details of the experimental setup including beam and laser transport optics are first discussed. Next, the driving laser pulse structure is investigated and initial diagnostics are explored and compared to simulations. Finally, planned improvements to the experimental setup are discussed.
Physical mechanism of reectance inversion in hydrogen gas sensor with Pd/PVDF structures
Mandelis, Andreas
, and industrial sectors. As part of the infrastructure of hydrogen-based technologies, the development of reliablePhysical mechanism of re¯ectance inversion in hydrogen gas sensor with Pd/PVDF structures Chinhua in thin-®lm Pd on polyvinylidene ¯uoride (PVDF) optical hydrogen sensor structures (Pd/PVDF) upon exposure
Sailhac, Pascal
1 Estimating aquifer hydraulic properties from the inversion of surface 2 Streaming Potential (SP with the geometry of the water table. It follows that 11 SP measurements can be used to estimate aquifer hydraulic and found that we 14 are able to estimate the hydraulic conductivity and the depth 15 and the thickness
Utah, University of
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
Simplified solutions of the Cox-Thompson inverse scattering method at fixed energy
Tamas Palmai; Miklos Horvath; Barnabas Apagyi
2011-11-25T23:59:59.000Z
Simplified solutions of the Cox-Thompson inverse quantum scattering method at fixed energy are derived if a finite number of partial waves with only even or odd angular momenta contribute to the scattering process. Based on new formulae various approximate methods are introduced which also prove applicable to the generic scattering events.
Late-to Post-Cretaceous Inversion of the British Isles Tectonic Stylolites at Flamborough Head
Guo, Zaoyang
not much is known about younger inversion events in the UK. Industrial: A lot of the oil and gas traps. Geology 36(11), 839-842. Koehn, D., Renard, F., Toussaint, R., Passchier, C.W. (2007) Growth of stylolite at Flamborough Head, U.K. Journal of Structural Geology 16, 97-107. Application procedure and deadlines
AN INVERSE MID-HIGH FREQUENCY ENERGY METHOD : FORMULATION AND APPLICATIONS
Paris-Sud XI, Université de
and Vibration (ICSV17), Cairo, Egypt, 18-22 July 2010 intensity vectors indicating the energy flowAN INVERSE MID-HIGH FREQUENCY ENERGY METHOD : FORMULATION AND APPLICATIONS O. Bareille, M, avenue Guy de Collongue, 69134 Ecully cedex - France, e-mail: olivier.bareille@ec-lyon.fr An energy
Using inverse-weighting in cost-eectiveness analysis with censored data
Lin, Danyu
Using inverse-weighting in cost-e¡ectiveness analysis with censored data AR Willan Program-weighting is used for censored cost and quality of life data. The methods are illustrated in an example using patient-level cost data in addition to effectiveness outcomes in randomized clinical trials. As a result
Coutinho, Alvaro L. G. A.
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
DIRECT AND INVERSE MEDIUM SCATTERING IN A 3D HOMOGENEOUS PLANAR WAVEGUIDE
Boyer, Edmond
GINTIDES, AND ARMIN LECHLEITER Abstract. Time-harmonic acoustic waves in an ocean of finite height of bounded penetrable scatterers. More important, we propose the Factorization method for solving inverse for the propagation of time-harmonic acoustic waves in the ocean [1,7,27,29]. In this model, waves traveling inside
Temperature inversion on the surface of externally heated optically thick multigrain dust clouds
Dejan Vinkovic
2006-12-01T23:59:59.000Z
It was recently discovered that the temperature in the surface layer of externally heated optically thick gray dust clouds increases with the optical depth for some distance from the surface, as opposed to the normal decrease in temperature with distance in the rest of the cloud. This temperature inversion is a result of efficient absorption of diffuse flux from the cloud interior by the surface dust exposed to the external radiation. A micron or bigger size grains experience this effect when the external flux is of stellar spectrum. We explore what happens to the effect when dust is a mixture of grain sizes (multigrain). Two possible boundary conditions are considered: i) a constant external flux without constrains on the dust temperature, and ii) the maximum dust temperature set to the sublimation temperature. We find that the first condition allows small grains to completely suppress the temperature inversion of big grains if the overall opacity is dominated by small grains. The second condition enables big grains to maintain the inversion even when they are a minor contributor to the opacity. In reality, the choice of boundary condition depends on the dust dynamics. When applied to the physics of protoplanetary disks, the temperature inversion leads to a previously unrecognized disk structure where optically thin dust can exist inside the dust destruction radius of an optically thick disk. We conclude that the transition between the dusty disk and the gaseous inner clearing is not a sharp edge, but rather a large optically thin region.
Paris-Sud XI, Université de
Figure 5 : Inversed attenuation tomography The Fresnel volume thus defined, also called Fréchet system with the LSQR algorithm : Because the size of the Fresnel volume thus defined is dependent propose to compute the Fresnel weights for a monochromatic wave, increasing its frequency at each step
Inverse electronic scattering from shifted projections within the Fresnel-Kirchhoff formalism
Mayer, Alexandre
Inverse electronic scattering from shifted projections within the Fresnel-Kirchhoff formalism A is that of Fresnel-Kirchhoff, which describes the sample as a two-dimensional mask. By processing simultaneously-dimensional nanometric sample that is observed in Fresnel conditions with an electron energy of 40 eV. The parameters
Simultaneous Inversion of Production Data and Seismic Attributes: Application to a Synthetic
Boyer, Edmond
nouvelles DOI: 10.2516/ogst/2012004 Monitoring of CO2 Sequestration and Hydrocarbon Production M and to build reliable numerical models for representing these formations. This concern recently motivated the development of dedicated inversion or matching techniques for identifying models consistent with all collected
Inverse Modeling and Animation of Growing Single-stemmed Trees at Interactive Rates
Linsen, Lars
residents. Benefits include energy savings, air pol- lutant uptake, CO2 sequestration, storm-water runoffInverse Modeling and Animation of Growing Single-stemmed Trees at Interactive Rates Steffen Rudnick species may best fit a particular environment. The models used for the animation must conform to real
Concrete calcium leaching at variable temperature: experimental data and numerical model inverse
Paris-Sud XI, UniversitÃ© de
, concrete porous solution is very basic (pH around 13) and several ionic species are highly concentrated [1Concrete calcium leaching at variable temperature: experimental data and numerical model inverse/DSU/SSIAD/BERIS, Fontenay-aux-Roses, France Abstract A simplified model for calcium leaching in concrete is presented
The "Inverse CSI Effect": Evidence from E-crime Data Richard E Overill
Overill, Richard E.
reported that in a private conversation in July 2011 Lord Justice Leveson claimed to have coined the term Effect" which ex- amines how an actual or potential criminal might be expected to react to the CSI Effect of cyber-criminals. If the proposed Inverse CSI Effect were indeed operative in the cyber domain, causing
Menut, Laurent
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
Near-field inverse scattering and image Images, projections, tomographs, reconstructions.
scanning tunnelling microscopy," Journ. Opt.A: Pure and Appl. Opt. 4 S140-S144 (2002) P Scott Carney Â· Diffractive elements http://optics.beckman.uiuc.edu P Scott Carney #12;References P Scott Carney and John C Schotland,"Inverse scattering for near-field microscopy," Appl. Phys. Lett. 77, 2798 (2000). P Scott Carney
Knowles, Ian W.
Inverse groundwater modelling in the Willunga Basin, South Australia Ian Knowles & Michael Teubner flow, based on a functional minimization technique, has been used to calibrate a groundwater flow model is the location of extensive viticulture, irrigated primarily by groundwater, the levels and quality of which have
Particle Physics Implications of a Recent Test of the Gravitational Inverse Square Law
E. G. Adelberger; B. R. Heckel; S. Hoedl; C. D. Hoyle; D. J. Kapner; A. Upadhye
2007-02-07T23:59:59.000Z
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.
A sliced inverse regression approach for data stream Marie Chavent1,2
Paris-Sud XI, Université de
regression model involving a common EDR (Effective Dimension Reduction) direction is assumed in each block consists of pooling all the observed blocks and estimating the EDR direction by the SIR (Sliced Inverse.e., drift in the EDR direction or aberrant blocks in the data stream. In a simulation study, we illustrate
A sliced inverse regression approach for data stream Marie Chavent1,2
Paris-Sud XI, Université de
regression model involving a common EDR (Effective Dimension Reduction) direction is assumed in each block consists of pooling all the observed blocks and estimating the EDR direction by the SIR (Sliced Inverse. A graphical tool is also provided in order to detect changes in the underlying model, i.e., drift in the EDR
Seismic Velocity Inversion with Genetic Algorithms Sushil J. Louis Qinxue Chen
Louis, Sushil J.
Seismic Velocity Inversion with Genetic Algorithms Sushil J. Louis Qinxue Chen Genetic AdaptiveÂsurface models from seismic travelÂtime data. Given a subÂsurface model, the physics of wave propagation through refractive media can be used to compute travel times for seismic waves. HowÂ ever, in practice, we have
Second-order adjoint state methods for Full Waveform Inversion June 25, 2013
of Gauss-Newton method compared to the steepest descent one in a canonical application. Hu et al. (2011 propose an efficient matrix-free Hessian- vector formalism, that should allow to tackle Gauss-Newton (GN of the interest of accounting for the exact Hessian in the inversion process. The final aim is to tackle Gauss
A NONLINEAR INVERSE SCALE SPACE METHOD FOR A CONVEX MULTIPLICATIVE NOISE MODEL
Soatto, Stefano
AND STANLEY OSHER Abstract. We are motivated by a recently developed nonlinear inverse scale space method to an iterative regularization method based on the Bregman distance in [21], motivated by Meyer's analysis in [19 (). In order to preserve the texture information Meyer suggested a modified variational problem using the space
Petrophysical inversion of borehole array-induction logs: Part II --Field data examples
Torres-Verdín, Carlos
Petrophysical inversion of borehole array-induction logs: Part II -- Field data examples Carlos with over 30,000 wells Sorenson, 2005 . Reservoir flow units consist of rela- tively thin 210 m marine carbonates along with fine-grained clastics and shales. The penetrated thickness of the formation in the two
Sun, Yu; Hou, Zhangshuan; Huang, Maoyi; Tian, Fuqiang; Leung, Lai-Yung R.
2013-12-10T23:59:59.000Z
This study demonstrates the possibility of inverting hydrologic parameters using surface flux and runoff observations in version 4 of the Community Land Model (CLM4). Previous studies showed that surface flux and runoff calculations are sensitive to major hydrologic parameters in CLM4 over different watersheds, and illustrated the necessity and possibility of parameter calibration. Two inversion strategies, the deterministic least-square fitting and stochastic Markov-Chain Monte-Carlo (MCMC) - Bayesian inversion approaches, are evaluated by applying them to CLM4 at selected sites. The unknowns to be estimated include surface and subsurface runoff generation parameters and vadose zone soil water parameters. We find that using model parameters calibrated by the least-square fitting provides little improvements in the model simulations but the sampling-based stochastic inversion approaches are consistent - as more information comes in, the predictive intervals of the calibrated parameters become narrower and the misfits between the calculated and observed responses decrease. In general, parameters that are identified to be significant through sensitivity analyses and statistical tests are better calibrated than those with weak or nonlinear impacts on flux or runoff observations. Temporal resolution of observations has larger impacts on the results of inverse modeling using heat flux data than runoff data. Soil and vegetation cover have important impacts on parameter sensitivities, leading to the different patterns of posterior distributions of parameters at different sites. Overall, the MCMC-Bayesian inversion approach effectively and reliably improves the simulation of CLM under different climates and environmental conditions. Bayesian model averaging of the posterior estimates with different reference acceptance probabilities can smooth the posterior distribution and provide more reliable parameter estimates, but at the expense of wider uncertainty bounds.
F. S. Kitaura; T. A. Ensslin
2009-11-06T23:59:59.000Z
We address the inverse problem of cosmic large-scale structure reconstruction from a Bayesian perspective. For a linear data model, a number of known and novel reconstruction schemes, which differ in terms of the underlying signal prior, data likelihood, and numerical inverse extra-regularization schemes are derived and classified. The Bayesian methodology presented in this paper tries to unify and extend the following methods: Wiener-filtering, Tikhonov regularization, Ridge regression, Maximum Entropy, and inverse regularization techniques. The inverse techniques considered here are the asymptotic regularization, the Jacobi, Steepest Descent, Newton-Raphson, Landweber-Fridman, and both linear and non-linear Krylov methods based on Fletcher-Reeves, Polak-Ribiere, and Hestenes-Stiefel Conjugate Gradients. The structures of the up-to-date highest-performing algorithms are presented, based on an operator scheme, which permits one to exploit the power of fast Fourier transforms. Using such an implementation of the generalized Wiener-filter in the novel ARGO-software package, the different numerical schemes are benchmarked with 1-, 2-, and 3-dimensional problems including structured white and Poissonian noise, data windowing and blurring effects. A novel numerical Krylov scheme is shown to be superior in terms of performance and fidelity. These fast inverse methods ultimately will enable the application of sampling techniques to explore complex joint posterior distributions. We outline how the space of the dark-matter density field, the peculiar velocity field, and the power spectrum can jointly be investigated by a Gibbs-sampling process. Such a method can be applied for the redshift distortions correction of the observed galaxies and for time-reversal reconstructions of the initial density field.
Milutinovi?, A. [Institute of Physics, University of Belgrade, Pregrevica 118, Zemun, Belgrade (Serbia); Lazarevi?, Z., E-mail: lzorica@yahoo.com [Institute of Physics, University of Belgrade, Pregrevica 118, Zemun, Belgrade (Serbia); Jovaleki?, ?. [Institute for Multidisciplinary Research, University of Belgrade, Belgrade (Serbia); Kuryliszyn-Kudelska, I. [Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw (Poland); Rom?evi?, M.; Kosti?, S.; Rom?evi?, N. [Institute of Physics, University of Belgrade, Pregrevica 118, Zemun, Belgrade (Serbia)
2013-11-15T23:59:59.000Z
Graphical abstract: - Highlights: • Nano powder of ZnFe{sub 2}O{sub 4} prepared by a soft mechanochemical route after 18 h milling. • Phase formation controlled by XRD, Raman spectroscopy and magnetic measurements. • Size, strain and cation inversion degree determined by Rietveld refinement. • We were able to estimate the degree of inversion at most 0.348 and 0.4. • Obtained extremely high values of saturation magnetizations at T = 4.5 K. - Abstract: Two zinc ferrite nanoparticle materials were prepared by the same method – soft mechanochemical synthesis, but starting from different powder mixtures: (1) Zn(OH){sub 2}/?-Fe{sub 2}O{sub 3} and (2) Zn(OH){sub 2}/Fe(OH){sub 3}. In both cases a single phase system was obtained after 18 h of milling. The progress of the synthesis was controlled by X-ray diffractometry (XRD), Raman spectroscopy, TEM and magnetic measurements. Analysis of the XRD patterns by Rietveld refinement allowed determination of the cation inversion degree for both obtained single phase ZnFe{sub 2}O{sub 4} samples. The sample obtained from mixture (1) has the cation inversion degree 0.3482 and the sample obtained from mixture (2) 0.400. Magnetization measurements were confirmed that the degrees of the inversion were well estimated. Comparison with published data shows that used method of synthesis gives nano powder samples with extremely high values of saturation magnetizations: sample (1) 78.3 emu g{sup ?1} and sample (2) 91.5 emu g{sup ?1} at T = 4.5 K.
Single- and coupled-channel radial inverse scattering with supersymmetric transformations
Daniel Baye; Jean-Marc Sparenberg; Andrey M Pupasov-Maksimov; Boris F Samsonov
2014-06-13T23:59:59.000Z
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.
Al-doped ZnO inverse opal networks as efficient electron collectors in BiVO4 photoanodes for solar
Steiner, Ullrich
Al-doped ZnO inverse opal networks as efficient electron collectors in BiVO4 photoanodes for solar-doped ZnO inverse opal network is introduced into a BiVO4 photoanode. The conductive inverse opal network of photogenerated charge carriers limits the performance of photoelectrodes for solar water splitting. To reduce
Linde, Niklas; Tryggvason, Ari; Peterson, John; Hubbard, Susan
2008-04-15T23:59:59.000Z
The structural approach to joint inversion, entailing common boundaries or gradients, offers a flexible way to invert diverse types of surface-based and/or crosshole geophysical data. The cross-gradients function has been introduced as a means to construct models in which spatial changes in two models are parallel or anti-parallel. Inversion methods that use such structural constraints also provide estimates of non-linear and non-unique field-scale relationships between model parameters. Here, we invert jointly crosshole radar and seismic traveltimes for structurally similar models using an iterative non-linear traveltime tomography algorithm. Application of the inversion scheme to synthetic data demonstrates that it better resolves lithological boundaries than the individual inversions. Tests of the scheme on observed radar and seismic data acquired within a shallow aquifer illustrate that the resultant models have improved correlations with flowmeter data than with models based on individual inversions. The highest correlation with the flowmeter data is obtained when the joint inversion is combined with a stochastic regularization operator, where the vertical integral scale is estimated from the flowmeter data. Point-spread functions shows that the most significant resolution improvements of the joint inversion is in the horizontal direction.
Ramirez, A; Mcnab, W; Hao, Y; White, D; Johnson, J
2011-04-14T23:59:59.000Z
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.
Pahn, T.; Jonkman, J.; Rolges, R.; Robertson, A.
2012-11-01T23:59:59.000Z
Physically measuring the dynamic responses of wind turbine support structures enables the calculation of the applied loads using an inverse procedure. In this process, inverse means deriving the inputs/forces from the outputs/responses. This paper presents results of a numerical verification of such an inverse load calculation. For this verification, the comprehensive simulation code FAST is used. FAST accounts for the coupled dynamics of wind inflow, aerodynamics, elasticity and turbine controls. Simulations are run using a 5-MW onshore wind turbine model with a tubular tower. Both the applied loads due to the instantaneous wind field and the resulting system responses are known from the simulations. Using the system responses as inputs to the inverse calculation, the applied loads are calculated, which in this case are the rotor thrust forces. These forces are compared to the rotor thrust forces known from the FAST simulations. The results of these comparisons are presented to assess the accuracy of the inverse calculation. To study the influences of turbine controls, load cases in normal operation between cut-in and rated wind speed, near rated wind speed and between rated and cut-out wind speed are chosen. The presented study shows that the inverse load calculation is capable of computing very good estimates of the rotor thrust. The accuracy of the inverse calculation does not depend on the control activity of the wind turbine.
Figure 1 Coupled system Subsystem 1
Chen, Wei
to the multiobjective collaborative optimization (MCO) in [12]. All the existing applications of CO are limited
Formal Semantics for Interacting UML subsystems
Jurjens, Jan
or attack need to exclude possible weaknesses. Problem: correctness in conflict with cost. Thorough methods, substates, internal activities. Here: simplified. Jan JÂ¨urjens, TU Munich: Formal Semantics for Interacting
FreedomCAR - Aftertreatment Subsystem Development
Lisa A. Prentiss
2005-09-30T23:59:59.000Z
The primary objective of this program was to develop generic aftertreatment technologies applicable for LDV and LDT engines ranging from 55 kW to 200kW, to develop an optimized and integrated aftertreatment system for a LDT (Light Duty Truck) type vehicle, and to demonstrate the technology which will enable light duty diesel engines to meet Federal Tier II regulation with minimum impact on fuel economy. Specifically, the development targets for emissions reduction and fuel injection penalty are given below: (1) NOx conversion efficiency > 90% (hot), > 84% (combined); (2) PM conversion efficiency > 90% (hot), > 84% (combined); (3) Fuel penalty over FTP-75 Less than 5%; and (4) Fuel penalty at Cruise condition Less than 3%. Development of cost-effective, highly efficient diesel exhaust aftertreatment systems in combination with very low engine out emission combustion development are essential elements for realization of Federal Tier II emission standards for Light Duty Trucks and Vehicles. Evaluation of several aftertreatment technologies was completed as part of this program. A combination of Diesel Oxidation Catalyst, NOx Adsorbing Catalyst and Catalyzed Soot Filter was found to provide the levels of conversion efficiency required to achieve the emission targets. While early systems required relatively large catalyst volumes, external dosing, sulfur traps, full bypass configurations and high levels of Platinum metals; the final system is a compact, scalable, flow-through, fully-integrated and engine-managed aftertreatment system capable of commercial application for Light Duty Vehicles and Trucks. NOx adsorber/particulate filter technology is particularly attractive for Light Duty applications due to the lower exhaust flow and temperature requirements as compared to Heavy Duty engines. Despite these strong positive aspects, NOx Adsorbers are challenged by their regeneration requirements and susceptibility to sulfur poisoning and thermal degradation. Capability was developed to regenerate the NOx Adsorber for NOx and SOx as well as the Particulate Filter for soot. This system was fully integrated into a truck and evaluated over the chassis dynamometer for emissions capability and in real-world winter field testing. Durability of the system was evaluated over a variety of accelerated and real-time dynamometer tests. Excellent NOx and PM conversion efficiency was demonstrated, even following 3000 hrs of endurance testing. Unregulated emissions emitted by the system were evaluated as was the fuel penalty associated with the DeNOx and DeSOx regeneration processes. In the final evaluation, the system demonstrated 90% NOx conversion and 99% PM conversion at a 6% fuel penalty over the FTP-75 test cycle. While target fuel penalty levels were demonstrated using full-bypass configuration systems, the cost associated with those systems was prohibitively high and would preclude successful commercialization of the technology. Although the flow-through configuration fell 1% short of the 5% fuel penalty target, the cost of this configuration is such that commercial application is feasible. Cost drivers for the final system configuration were identified and demonstrate areas where future development areas could focus.
Comparing radiative and recoil corrections in neutron beta-decay and inverse beta-decay
U. Raha; F. Myhrer; K. Kubodera
2014-05-06T23:59:59.000Z
The inverse $\\beta$-decay reaction, anti-nu_e + p --> e^+ + n, for low-energy anti-neutrinos coming from nuclear reactors is of great current interest in connection with high-precision measurements of the neutrino mixing angle $\\theta_{13}$. We have previously derived analytic expressions, up to next-to-leading order in heavy-baryon chiral perturbation theory, for the radiative corrections (RCs) and the nucleon-recoil corrections both for this reaction and for the related neutron $\\beta$-decay process. We investigate here the numerical consequences of these analytic expressions. We show that the recoil corrections are small for neutron $\\beta$-decay, but for inverse $\\beta$-decay, the recoil corrections are comparable in size to the RCs for typical energies of reactor anti-neutrinos, and they have opposite signs. It turns out that the RCs and the recoil corrections exhibit very different dependences on the neutrino energy.
SOLA inversions for the core structure of solar-type stars
Sarbani Basu; J. Christensen-Dalsgaard; M. J. Thompson
2001-10-19T23:59:59.000Z
The Subtractive Optimally Localized Averages (SOLA) method, developed and extensively used in helioseismology, is applied to artificial data to obtain measures of the sound speed inside a solar-type star. In contrast to inversion methods which fit models to some aspect of the data, methods such as SOLA provide an honest assessment of what can truly be resolved using seismic data, without introducing additional assumptions such as that the space of admissible stellar models is small. The resulting measures obtained from SOLA inversion can subsequently be used to eliminate putative stellar models. Here we present results of experiments to test the reliability of SOLA inferences using solar models and models of solar-type stars.
Testing the inversion of asteroids' Gaia photometry combined with ground-based observations
Santana-Ros, T; Micha?owski, T; Tanga, P; Cellino, A
2015-01-01T23:59:59.000Z
We investigated the reliability of the genetic algorithm which will be used to invert the photometric measurements of asteroids collected by the European Space Agency Gaia mission. To do that, we performed several sets of simulations for 10 000 asteroids having different spin axis orientations, rotational periods and shapes. The observational epochs used for each simulation were extracted from the Gaia mission simulator developed at the Observatoire de la C\\^{o}te d'Azur, while the brightness was generated using a Z-buffer standard graphic method. We also explored the influence on the inversion results of contaminating the data set with Gaussian noise with different $\\sigma$ values. The research enabled us to determine a correlation between the reliability of the inversion method and the asteroid's pole latitude. In particular, the results are biased for asteroids having quasi-spherical shapes and low pole latitudes. This effect is caused by the low lightcurve amplitude observed under such circumstances, as t...
SOUND-SPEED INVERSION OF THE SUN USING A NONLOCAL STATISTICAL CONVECTION THEORY
Zhang Chunguang; Deng Licai [Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China); Xiong Darun [Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China); Christensen-Dalsgaard, Jorgen, E-mail: cgzhang@nao.cas.cn [Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C (Denmark)
2012-11-01T23:59:59.000Z
Helioseismic inversions reveal a major discrepancy in sound speed between the Sun and the standard solar model just below the base of the solar convection zone. We demonstrate that this discrepancy is caused by the inherent shortcomings of the local mixing-length theory adopted in the standard solar model. Using a self-consistent nonlocal convection theory, we construct an envelope model of the Sun for sound-speed inversion. Our solar model has a very smooth transition from the convective envelope to the radiative interior, and the convective energy flux changes sign crossing the boundaries of the convection zone. It shows evident improvement over the standard solar model, with a significant reduction in the discrepancy in sound speed between the Sun and local convection models.
Rao-Blackwellised Interacting Markov Chain Monte Carlo for Electromagnetic Scattering Inversion
Giraud, François
2012-01-01T23:59:59.000Z
The following electromagnetism (EM) inverse problem is addressed. It consists in estimating local radioelectric properties of materials recovering an object from the global EM scattering measurement, at various incidences and wave frequencies. This large scale ill-posed inverse problem is explored by an intensive exploitation of an efficient 2D Maxwell solver, distributed on High Performance Computing (HPC) machines. Applied to a large training data set, a statistical analysis reduces the problem to a simpler probabilistic metamodel, on which Bayesian inference can be performed. Considering the radioelectric properties as a dynamic stochastic process, evolving in function of the frequency, it is shown how advanced Markov Chain Monte Carlo methods, called Sequential Monte Carlo (SMC) or interacting particles, can provide estimations of the EM properties of each material, and their associated uncertainties.
Building accurate initial models using gain functions for waveform inversion in the Laplace domain
Wansoo Ha; Changsoo Shin
2014-08-20T23:59:59.000Z
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.
Use of the Inverse Approach for the Manufacture and Decoration of Food Cans
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
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.
Strategy for the inversion of Hinode spectropolarimetric measurements in the quiet Sun
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
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.
Ash plume properties retrieved from infrared images: a forward and inverse modeling approach
Cerminara, Matteo; Valade, Sébastien; Harris, Andrew J L
2014-01-01T23:59:59.000Z
We present a coupled fluid-dynamic and electromagnetic model for volcanic ash plumes. In a forward approach, the model is able to simulate the plume dynamics from prescribed input flow conditions and generate the corresponding synthetic thermal infrared (TIR) image, allowing a comparison with field-based observations. An inversion procedure is then developed to retrieve ash plume properties from TIR images. The adopted fluid-dynamic model is based on a one-dimensional, stationary description of a self-similar (top-hat) turbulent plume, for which an asymptotic analytical solution is obtained. The electromagnetic emission/absorption model is based on the Schwarzschild's equation and on Mie's theory for disperse particles, assuming that particles are coarser than the radiation wavelength and neglecting scattering. [...] Application of the inversion procedure to an ash plume at Santiaguito volcano (Guatemala) has allowed us to retrieve the main plume input parameters, namely the initial radius $b_0$, velocity $U_...
Inverse scattering J-matrix approach to nucleon-nucleus scattering and the shell model
A. M. Shirokov; A. I. Mazur; J. P. Vary; E. A. Mazur
2008-10-06T23:59:59.000Z
The $J$-matrix inverse scattering approach can be used as an alternative to a conventional $R$-matrix in analyzing scattering phase shifts and extracting resonance energies and widths from experimental data. A great advantage of the $J$-matrix is that it provides eigenstates directly related to the ones obtained in the shell model in a given model space and with a given value of the oscillator spacing $\\hbar\\Omega$. This relationship is of a particular interest in the cases when a many-body system does not have a resonant state or the resonance is broad and its energy can differ significantly from the shell model eigenstate. We discuss the $J$-matrix inverse scattering technique, extend it for the case of charged colliding particles and apply it to the analysis of $n\\alpha$ and $p\\alpha$ scattering. The results are compared with the No-core Shell Model calculations of $^5$He and $^5$Li.
Spectroscopy of Double-Beta and Inverse-Beta Decays from 100Mo for Neutrinos
H. Ejiri; J. Engel; R. Hazama; P. Krastev; N. Kudomi; R. G. H. Robertson
2000-05-15T23:59:59.000Z
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.
Experimental Observation of the Inverse Spin Hall Effect at Room Temperature
Liu, Baoli; Shi, Junren; Wang, Wenxin; Zhao, Hongming; Li, Dafang; /Beijing, Inst. Phys.; Zhang, Shoucheng; /Stanford U., Phys. Dept.; Xue, Qikun; Chen, Dongmin; /Beijing, Inst. Phys.
2010-03-16T23:59:59.000Z
We observe the inverse spin Hall effect in a two-dimensional electron gas confined in Al-GaAs/InGaAs quantum wells. Specifically, they find that an inhomogeneous spin density induced by the optical injection gives rise to an electric current transverse to both the spin polarization and its gradient. The spin Hall conductivity can be inferred from such a measurement through the Einstein relation and the onsager relation, and is found to have the order of magnitude of 0.5(e{sup 2}/h). The observation is made at the room temperature and in samples with macroscopic sizes, suggesting that the inverse spin Hall effects is a robust macroscopic transport phenomenon.
Alexandre Jollivet
2013-06-16T23:59:59.000Z
We define scattering data for the Newton equation in a potential $V\\in C^2(\\R^n,\\R)$, $n\\ge2$, that decays at infinity like $r^{-\\alpha}$ for some $\\alpha\\in (0,1]$. We provide estimates on the scattering solutions and scattering data and we prove, in particular, that the scattering data at high energies uniquely determine the short range part of the potential up to the knowledge of the long range tail of the potential. The Born approximation at fixed energy of the scattering data is also considered. We then change the definition of the scattering data to study inverse scattering in other asymptotic regimes. These results were obtained by developing the inverse scattering approach of [Novikov, 1999].
Ram Lal Awasthi; M. K. Parida; Sudhanwa Patra
2013-01-21T23:59:59.000Z
In the inverse seesaw extension of the standard model, supersymmetric or non-supersymmetric, while the light left-handed neutrinos are Majorana, the heavy right-handed neutrinos are pseudo-Dirac fermions. We show how one of these latter category of particles can contribute quite significantly to neutrinoless double beta decay. The neutrino virtuality momentum is found to play a crucial role in the non-standard contributions leading to the prediction of the pseudo-Dirac fermion mass in the range of $120\\, {MeV}-500\\, {MeV}$. When the Dirac neutrino mass matrix in the inverse seesaw formula is similar to the up-quark mass matrix, characteristic of high scale quark-lepton symmetric origin, the predicted branching ratios for lepton flavor violating decays are also found to be closer to the accessible range of ongoing experiments.
Pragmatic SAE procedure in the Schrodinger equation for the inverse-square-like potentials
Nadareishvili, Teimuraz
2012-01-01T23:59:59.000Z
The Self-Adjoint Extension in the Schrodinger equation for potentials behaved as an attractive inverse square at the origin is critically reviewed. Original results are also presented. It is shown that the additional non-regular solutions must be retained for definite interval of parameters, which requires a necessity of performing a Self-Adjoint Extension (SAE) procedure of radial Hamiltonian.The Pragmatic approach is used and some of its consequences are considered for wide class of transitive potentials. Our consideration is based on the established earlier by us a boundary condition for the radial wave function and the corresponding consequences are derived. Various relevant applications are presented as well. They are: inverse square potential in the Schrodinger equation is solved when the additional non-regular solution is retained. Valence electron model and the Klein-Gordon equation with the Coulomb potential is considered and the hydrino -like levels are discussed.
Pragmatic SAE procedure in the Schrodinger equation for the inverse-square-like potentials
Teimuraz Nadareishvili; Anzor Khelashvili
2012-10-14T23:59:59.000Z
The Self-Adjoint Extension in the Schrodinger equation for potentials behaved as an attractive inverse square at the origin is critically reviewed. Original results are also presented. It is shown that the additional non-regular solutions must be retained for definite interval of parameters, which requires a necessity of performing a Self-Adjoint Extension (SAE) procedure of radial Hamiltonian.The Pragmatic approach is used and some of its consequences are considered for wide class of transitive potentials. Our consideration is based on the established earlier by us a boundary condition for the radial wave function and the corresponding consequences are derived. Various relevant applications are presented as well. They are: inverse square potential in the Schrodinger equation is solved when the additional non-regular solution is retained. Valence electron model and the Klein-Gordon equation with the Coulomb potential is considered and the hydrino -like levels are discussed.
Impeded inverse energy transfer in the Charney--Hasegawa--Mima model of quasi-geostrophic flows
Chuong V. Tran; David G. Dritschel
2005-12-02T23:59:59.000Z
The behaviour of turbulent flows within the single-layer quasi-geostrophic (Charney--Hasegawa--Mima) model is shown to be strongly dependent on the Rossby deformation wavenumber $\\lambda$ (or free-surface elasticity). Herein, we derive a bound on the inverse energy transfer, specifically on the growth rate $\\d\\ell/\\dt$ of the characteristic length scale $\\ell$ representing the energy centroid. It is found that $\\d\\ell/\\dt\\le2\
New inverse quasifission mechanism to produce neutron-rich transfermium nuclei
Kedziora, David J. [Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200 (Australia); Simenel, Cedric [Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200 (Australia); CEA, Centre de Saclay, IRFU/Service de Physique Nucleaire, F-91191 Gif-sur-Yvette (France)
2010-04-15T23:59:59.000Z
Based on time-dependent Hartree-Fock theory, a new inverse quasifission mechanism is proposed to produce neutron-rich transfermium nuclei in the collision of prolate deformed actinides. Calculations show that the collision of the tip of one nucleus with the side of the other results in a nucleon flux toward the latter. The roles of nucleon evaporation and impact parameter, as well as collision time, are discussed.
Saha, Debajyoti, E-mail: debajyoti.saha@saha.ac.in; Kumar Shaw, Pankaj; Janaki, M. S.; Sekar Iyengar, A. N.; Ghosh, Sabuj; Mitra, Vramori, E-mail: vramorimitra@yahoo.com; Michael Wharton, Alpha [Plasma Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064 (India)] [Plasma Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064 (India)
2014-03-15T23:59:59.000Z
Order-chaos-order was observed in the relaxation oscillations of a glow discharge plasma with variation in the discharge voltage. The first transition exhibits an inverse homoclinic bifurcation followed by a homoclinic bifurcation in the second transition. For the two regimes of observations, a detailed analysis of correlation dimension, Lyapunov exponent, and Renyi entropy was carried out to explore the complex dynamics of the system.
Alloatti, L.; Lauermann, M.; Koos, C.; Freude, W. [Institutes IPQ and IMT, Karlsruhe Institute of Technology (KIT), Karlsruhe 76131 (Germany)] [Institutes IPQ and IMT, Karlsruhe Institute of Technology (KIT), Karlsruhe 76131 (Germany); Sürgers, C. [Physikalisches Institut and DFG-Center for Functional Nanostructures, Karlsruhe Institute of Technology, P. O. Box 6980, Karlsruhe 76049 (Germany)] [Physikalisches Institut and DFG-Center for Functional Nanostructures, Karlsruhe Institute of Technology, P. O. Box 6980, Karlsruhe 76049 (Germany); Leuthold, J. [Institutes IPQ and IMT, Karlsruhe Institute of Technology (KIT), Karlsruhe 76131 (Germany) [Institutes IPQ and IMT, Karlsruhe Institute of Technology (KIT), Karlsruhe 76131 (Germany); Institute of Electromagnetic Fields (IFH), ETH Zurich, Zurich (Switzerland)
2013-07-29T23:59:59.000Z
We determine the optical losses in gate-induced charge accumulation/inversion layers at a Si/SiO{sub 2} interface. Comparison between gate-induced charge layers and ion-implanted thin silicon films having an identical sheet resistance shows that optical losses can be significantly lower for gate-induced layers. For a given sheet resistance, holes produce higher optical loss than electrons. Measurements have been performed at ? = 1550 nm.
Three-dimensional gravity modeling and focusing inversion using rectangular meshes.
Commer, M.
2011-03-01T23:59:59.000Z
Rectangular grid cells are commonly used for the geophysical modeling of gravity anomalies, owing to their flexibility in constructing complex models. The straightforward handling of cubic cells in gravity inversion algorithms allows for a flexible imposition of model regularization constraints, which are generally essential in the inversion of static potential field data. The first part of this paper provides a review of commonly used expressions for calculating the gravity of a right polygonal prism, both for gravity and gradiometry, where the formulas of Plouff and Forsberg are adapted. The formulas can be cast into general forms practical for implementation. In the second part, a weighting scheme for resolution enhancement at depth is presented. Modelling the earth using highly digitized meshes, depth weighting schemes are typically applied to the model objective functional, subject to minimizing the data misfit. The scheme proposed here involves a non-linear conjugate gradient inversion scheme with a weighting function applied to the non-linear conjugate gradient scheme's gradient vector of the objective functional. The low depth resolution due to the quick decay of the gravity kernel functions is counteracted by suppressing the search directions in the parameter space that would lead to near-surface concentrations of gravity anomalies. Further, a density parameter transformation function enabling the imposition of lower and upper bounding constraints is employed. Using synthetic data from models of varying complexity and a field data set, it is demonstrated that, given an adequate depth weighting function, the gravity inversion in the transform space can recover geologically meaningful models requiring a minimum of prior information and user interaction.
Inverse fixed energy scattering problem for the two-dimensional nonlinear Schroedinger operator
Georgios Fotopoulos; Valery Serov
2014-12-01T23:59:59.000Z
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.
Observation of an Inverse Energy Cascade in Developed Acoustic Turbulence in Superfluid Helium
A. N. Ganshin; V. B. Efimov; G. V. Kolmakov; L. P. Mezhov-Deglin; P. V. E. McClintock
2009-01-27T23:59:59.000Z
We report observation of an inverse energy cascade in second sound acoustic turbulence in He II. Its onset occurs above a critical driving energy and it is accompanied by giant waves that constitute an acoustic analogue of the rogue waves that occasionally appear on the surface of the ocean. The theory of the phenomenon is developed and shown to be in good agreement with the experiments.
Observation of transient gain without population inversion in a laser-cooled rubidium lambda system
S. R. de Echaniz; Andrew D. Greentree; A. V. Durrant; D. M. Segal; J. P. Marangos; J. A. Vaccaro
2001-05-17T23:59:59.000Z
We have observed clear Rabi oscillations of a weak probe in a strongly driven three-level lambda system in laser-cooled rubidium for the first time. When the coupling field is non-adiabatically switched on using a Pockels cell, transient probe gain without population inversion is obtained in the presence of uncoupled absorptions. Our results are supported by three-state computations.
A Turbulent Constitutive Law for the Two-Dimensional Inverse Energy Cascade
Gregory L. Eyink
2005-12-10T23:59:59.000Z
We develop a fundamental approach to a turbulent constitutive law for the 2D inverse cascade, based upon a convergent multi-scale gradient (MSG) expansion. To first order in gradients we find that the turbulent stress generated by small-scale eddies is proportional not to strain but instead to `skew-strain,' i.e. the strain tensor rotated by $45^\\circ.$ The skew-strain from a given scale of motion makes no contribution to energy flux across eddies at that scale, so that the inverse cascade cannot be strongly scale-local. We show that this conclusion extends a result of Kraichnan for spectral transfer and is due to absence of vortex-stretching in 2D. This `weakly local' mechanism of inverse cascade requires a relative rotation between the principal directions of strain at different scales and we argue for this using both the dynamical equations of motion and also a heuristic model of `thinning' of small-scale vortices by an imposed large-scale strain. Carrying out our expansion to second-order in gradients, we find two additional terms in the stress that can contribute to energy cascade. The first is a Newtonian stress with an `eddy-viscosity' due to differential strain-rotation, and the second is a tensile stress exerted along vorticity contour-lines. The latter was anticipated by Kraichnan for a very special model situation of small-scale vortex wave-packets in a uniform strain field. We prove a proportionality in 2D between the mean rates of differential strain-rotation and of vorticity-gradient stretching, analogous to a similar relation of Betchov for 3D. According to this result the second-order stresses will also contribute to inverse cascade when, as is plausible, vorticity contour-lines lengthen on average by turbulent advection.
Direct Wing Design and Inverse Airfoil Identification with the Nonlinear Weissinger Method
Ranneberg, Maximilian
2015-01-01T23:59:59.000Z
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.
Iliassov, Pavel Alexandrovich
2000-01-01T23:59:59.000Z
INVERSION OF FIELD-SCALE PARTITIONING TRACER RESPONSE FOR CHARACTERIZING OIL SATURATION DISTRIBUTION: A STREAMLINE APPROACH A Thesis by PAVEL ALEXANDROVICH ILIASSOV Submitted to the Office of Graduate Studies of Texas A&M University... A Thesis by PAVEL ALEXANDROVICH ILIASSOV Submitted to Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved as to style and content by: c 4- Akhil Datta-Gupta (Chair of Committee...
Inverse-Compton Emission from Clusters of Galaxies: Predictions for ASTRO-H
Bartels, Richard; Ando, Shin'ichiro
2015-01-01T23:59:59.000Z
The intra-cluster medium of several galaxy clusters hosts large-scale regions of diffuse synchrotron radio emission, known as radio halos and relics, which demonstrate the presence of magnetic fields and relativistic electrons in clusters. These relativistic electrons should also emit X-rays through inverse-Compton scattering off of cosmic microwave background photons. The detection of such a non-thermal X-ray component, together with the radio measurement, would permit to clearly separate the magnetic field from the relativistic electron distribution as the inverse-Compton emission is independent from the magnetic field in the cluster. However, non-thermal X-rays have not been conclusively detected from any cluster of galaxies so far. In this paper, for the first time, we model the synchrotron and inverse-Compton emission of all clusters hosting radio halos and relics for which the spectral index can be determined. We provide constraints on the volume-average magnetic field by comparing with current X-ray me...
Dirk Veestraeten
2015-05-21T23:59:59.000Z
The Laplace transforms of the transition probability density and distribution functions for the Ornstein-Uhlenbeck process contain the product of two parabolic cylinder functions, namely D_{v}(x)D_{v}(y) and D_{v}(x)D_{v-1}(y), respectively. The inverse transforms of these products have as yet not been documented. However, the transition density and distribution functions can be obtained by alternatively applying Doob's transform to the Kolmogorov equation and casting the problem in terms of Brownian motion. Linking the resulting transition density and distribution functions to their Laplace transforms then specifies the inverse transforms to the aforementioned products of parabolic cylinder functions. These two results, the recurrence relation of the parabolic cylinder function and the properties of the Laplace transform then enable the calculation of inverse transforms also for countless other combinations in the orders of the parabolic cylinder functions such as D_{v}(x)D_{v-2}(y), D_{v+1}(x)D_{v-1}(y) and D_{v}(x)D_{v-3}(y).
Method for the preparation of metal colloids in inverse micelles and product preferred by the method
Wilcoxon, Jess P. (Albuquerque, NM)
1992-01-01T23:59:59.000Z
A method is provided for preparing catalytic elemental metal colloidal particles (e.g. gold, palladium, silver, rhodium, iridium, nickel, iron, platinum, molybdenum) or colloidal alloy particles (silver/iridium or platinum/gold). A homogeneous inverse micelle solution of a metal salt is first formed in a metal-salt solvent comprised of a surfactant (e.g. a nonionic or cationic surfactant) and an organic solvent. The size and number of inverse micelles is controlled by the proportions of the surfactant and the solvent. Then, the metal salt is reduced (by chemical reduction or by a pulsed or continuous wave UV laser) to colloidal particles of elemental metal. After their formation, the colloidal metal particles can be stabilized by reaction with materials that permanently add surface stabilizing groups to the surface of the colloidal metal particles. The sizes of the colloidal elemental metal particles and their size distribution is determined by the size and number of the inverse micelles. A second salt can be added with further reduction to form the colloidal alloy particles. After the colloidal elemental metal particles are formed, the homogeneous solution distributes to two phases, one phase rich in colloidal elemental metal particles and the other phase rich in surfactant. The colloidal elemental metal particles from one phase can be dried to form a powder useful as a catalyst. Surfactant can be recovered and recycled from the phase rich in surfactant.
Altman, Michael Darren
2006-01-01T23:59:59.000Z
This thesis presents the development and application of several computational techniques to aid in the design and analysis of small molecules and peptides that bind to protein targets. First, an inverse small-molecule ...
Chen, Jinsong
Joint stochastic inversion of geophysical data for reservoir parameter estimation Jinsong Chen the stochastic framework, both reservoir parameters and geophysical attributes at unsampled locations. Introduction Conventional methods for reservoir parameter estimation using multiple sources of geophysical data
Yang, Di
2013-01-01T23:59:59.000Z
Changes in reservoir properties resulting from extracting hydrocarbons and injecting fluid are critical to optimize production. These properties can be characterized using waveform inversions of time-lapse seismic data. ...
Adamski, Mark Robert
1993-01-01T23:59:59.000Z
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 Site in Washington state. Previous studies of these flow systems used...
Compact x-ray source based on burst-mode inverse Compton scattering at 100 kHz
Bessuille, J.
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 ...
Torres-Verdín, Carlos
-filtrate invasion and formation test. A fully implicit finite- difference black-oil reservoir simulator with brine phenomena in porous media can be coupled through fluid saturation equations. Thus, a multi-physics inversion
Stohl, A.
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 ...
Yedavalli, Rama K.
commands, no explicit parametric stability robustness margins are provided. A static approach to online. Dynamic inversion control laws require the use of a control mixer or control surface allocation algorithm
High Frequency Inversion Capacitance Measurements for 6H-SiC n-MOS Capacitors from 450 to 600 C
Ghosh, Ruby N.
High Frequency Inversion Capacitance Measurements for 6H-SiC n-MOS Capacitors from 450 to 600 °C inversion capacitance due to thermal generation of holes in 6H-SiC n-MOS capacitors between 450 and 600 °C to thermal generation of holes in 6H-SiC n-MOS capacitors between 450 and 600 °C. In order to ensure
Moriarty, Thomas D.
1988-01-01T23:59:59.000Z
in partial fidfillment of thc requirements for the degree of XIAS IER OF SOIL'NGF. December l988 iviajor Subject: Geophysics ES'I'llvlATION Ol' THV. DIIIECTION OF' RElvIANENT MACNETIZATION: AN INVERSE METHOD DSINC 'THE PIIASV. SPECTRIIM OV A MAGNETIC... ot Department) December 1988 ABSTRACT Estimation of Direction of Remanent Magnetization: An Inverse Method Using th~ Phase Spectrum ot a. Magnetic Anomaly. (December 1988) Thomas Daniel Moriarty, B. S. , Rensselaer Polytechnic Institute Co...
Statistics of black hole radiance and the horizon area spectrum
Bekenstein, Jacob D
2015-01-01T23:59:59.000Z
The statistical response of a Kerr black hole to incoming quantum radiation has heretofore been studied by the methods of maximum entropy or quantum field theory in curved spacetime. Neither approach pretends to take into account the quantum structure of the black hole itself. To address this last issue we calculate here the conditional probability distribution associated with the hole's response by assuming that the horizon area has a discrete quantum spectrum, and that its quantum evolution corresponds to jumps between adjacent area eigenvalues, possibly occurring in series, with consequent emission or absorption of quanta, possibly in the same mode. This "atomic" model of the black hole is implemented in two different ways and recovers the previously calculated radiation statistics in both cases. The corresponding conditional probably distribution is here expressed in closed form in terms of an hypergeometric function.
atmospheric emitted radiance: Topics by E-print Network
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mesoscales (wavelengths of 64-957 km) were obtained potential energy by differential solar heating. This is converted to eddy available potential energy 11 The horizontal...
The Radiance Process: Water and Chemical Free Cleaning
Robison, J. H.
Award. It employs quantum mechanical effects of laser light and a flowing inert gas, ordinarily nitrogen, to clean surfaces. The light lifts the contaminant from the surface and the flowing gas sweeps it away. There is no pollution and no waste besides...
INlST Measurement Services: Radiance Temperature Calibrations
methods, standards, and related services. The Institute does generic and precompetitive work on new Administration National Institute of Standards and Technology #12;he National Institute of Standards's basic functions is to develop, maintain, and retain custody of the national standards of measurement
Posters Atmospheric Emitted Radiance Interferometer Data Analysis Methods
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's Possible forPortsmouth/Paducah Project Office PressPostdoctoraldecadal observations71 Posters A513
Posters Residual Analysis of Surface Spectral Radiances Between Instrument Observations
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's Possible forPortsmouth/Paducah Project Office PressPostdoctoraldecadal observations719711 Posters
CIMEL Measurements of Zenith Radiances at the ARM SGP Site
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office511041clothAdvanced Materials Advanced. C o w l i t z C o . C l a r k C o'IUHopper3CHOS2,2,CIMEL
The ARM Atmospheric Emitted Radiance Interferometer (AERI): Status and
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over Our InstagramStructureProposedPAGESafetyTed Donat
HIGH-ENERGY EMISSION OF GRB 130427A: EVIDENCE FOR INVERSE COMPTON RADIATION
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
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.
Generalized Uncertainty Quantification for Linear Inverse Problems in X-ray Imaging
Fowler, Michael James
2014-04-25T23:59:59.000Z
In industrial and engineering applications, X-ray radiography has attained wide use as a data collection protocol for the assessment of material properties in cases where direct observation is not possible. The direct measurement of nuclear materials, particularly when they are under explosive or implosive loading, is not feasible, and radiography can serve as a useful tool for obtaining indirect measurements. In such experiments, high energy X-rays are pulsed through a scene containing material of interest, and a detector records a radiograph by measuring the radiation that is not attenuated in the scene. One approach to the analysis of these radiographs is to model the imaging system as an operator that acts upon the object being imaged to produce a radiograph. In this model, the goal is to solve an inverse problem to reconstruct the values of interest in the object, which are typically material properties such as density or areal density. The primary objective in this work is to provide quantitative solutions with uncertainty estimates for three separate applications in X-ray radiography: deconvolution, Abel inversion, and radiation spot shape reconstruction. For each problem, we introduce a new hierarchical Bayesian model for determining a posterior distribution on the unknowns and develop efficient Markov chain Monte Carlo (MCMC) methods for sampling from the posterior. A Poisson likelihood, based on a noise model for photon counts at the detector, is combined with a prior tailored to each application: an edge-localizing prior for deconvolution; a smoothing prior with non-negativity constraints for spot reconstruction; and a full covariance sampling prior based on a Wishart hyperprior for Abel inversion. After developing our methods in a general setting, we demonstrate each model on both synthetically generated datasets, including those from a well known radiation transport code, and real high energy radiographs taken at two U. S. Department of Energy laboratories.
A study of temperature inversions over selected stations in Texas and Louisiana
Parker, Truman
1967-01-01T23:59:59.000Z
. J I"'erii = r ) May Io6j A Study of Temperature Inversions Over Selected Stations in Texs, s and Louisiana (May 1967) Truman Parker, B. A. , Texas AEcM University B. S. , University of Washington Directed by: Prof. J. F. Griffiths..., but are also si gnificantly more requent and persistent. From the standpo' nt of stability, the coastal area, seems to have the greatest potential for air pollution. ACFJviOWLEDGNEiUTS Sincere appreci atio. . is expressed o Professor John F. Griffiths...
Interpreting Ulysses data using inverse scattering theory: Oblique Alfv\\'en waves
Wheeler, Harry R; Hamilton, R L
2015-01-01T23:59:59.000Z
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.
Structure analysis of single- and multi-frequency subspace migrations in inverse scattering problems
Young Deuk Jo; Young Mi Kwon; Joo Young Huh; Won-Kwang Park
2013-01-09T23:59:59.000Z
In this literature, we carefully investigate the structure of single- and multi-frequency imaging functions, that are usually employed in inverse scattering problems. Based on patterns of the singular vectors of the Multi-Static Response (MSR) matrix, we establish a relationship between imaging functions and the Bessel function. This relationship indicates certain properties of imaging functions and the reason behind enhancement in the imaging performance by multiple frequencies. Several numerical simulations with a large amount of noisy data are performed in order to support our investigation.