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Liu, David
We present a new technique for the design of transformation-optics devices based on large-scale optimization to achieve the optimal effective isotropic dielectric materials within prescribed index bounds, which is ...
Center for Inverse Design: About the Center for Inverse Design
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Alex Zunger (former Director, Center for Inverse Design); Tumas, Bill (Director, Center for Inverse Design); CID Staff
2011-11-02T23:59:59.000Z
'Inverse Design: Playing 'Jeopardy' in Materials Science' was submitted by the Center for Inverse Design (CID) to the 'Life at the Frontiers of Energy Research' video contest at the 2011 Science for Our Nation's Energy Future: Energy Frontier Research Centers (EFRCs) Summit and Forum. Twenty-six EFRCs created short videos to highlight their mission and their work. CID, an EFRC directed by Bill Tumas at the National Renewable Energy Laboratory is a partnership of scientists from five institutions: NREL (lead), Northwestern University, University of Colorado, Stanford University, and Oregon State University. The Office of Basic Energy Sciences in the U.S. Department of Energy's Office of Science established the 46 Energy Frontier Research Centers (EFRCs) in 2009. These collaboratively-organized centers conduct fundamental research focused on 'grand challenges' and use-inspired 'basic research needs' recently identified in major strategic planning efforts by the scientific community. The overall purpose is to accelerate scientific progress toward meeting the nation's critical energy challenges. The mission of the Center for Inverse Design is 'to replace trial-and-error methods used in the development of materials for solar energy conversion with an inverse design approach powered by theory and computation.' Research topics are: solar photovoltaic, photonic, metamaterial, defects, spin dynamics, matter by design, novel materials synthesis, and defect tolerant materials.
Equilibrium cluster fluids: Pair interactions via inverse design
Ryan B. Jadrich; Jonathan A. Bollinger; Beth A. Lindquist; Thomas M. Truskett
2015-09-14T23:59:59.000Z
Inverse methods of statistical mechanics are becoming productive tools in the design of materials with specific microstructures or properties. While initial studies have focused on solid-state design targets (e.g, assembly of colloidal superlattices), one can alternatively design fluid states with desired morphologies. This work addresses the latter and demonstrates how a simple iterative Boltzmann inversion strategy can be used to determine the isotropic pair potential that reproduces the radial distribution function of a fluid of amorphous clusters with prescribed size. The inverse designed pair potential of this "ideal" cluster fluid, with its broad attractive well and narrow repulsive barrier at larger separations, is qualitatively different from the so-called SALR form most commonly associated with equilibrium cluster formation in colloids, which features short-range attractive (SA) and long-range repulsive (LR) contributions. These differences reflect alternative mechanisms for promoting cluster formation with an isotropic pair potential, and they in turn produce structured fluids with qualitatively different static and dynamic properties. Specifically, equilibrium simulations show that the amorphous clusters resulting from the inverse designed potentials display more uniformity in size and shape, and they also show greater spatial and temporal resolution than those resulting from SALR interactions.
Inverse lattice design and its application to bent waveguides
E. Rivera-Mociños; E. Sadurní
2015-06-12T23:59:59.000Z
This paper is divided in two parts. In the first part, the inverse spectral problem for tight-binding hamiltonians is studied. This problem is shown to have an infinite number of solutions for properly chosen energies. The space of such solutions is characterized by a hypersurface in the space of hopping amplitudes (i.e. couplings), whose dimension is half the number of sites in the array. Low dimensional examples for short chains are carefully studied and a table of exactly solvable inverse problems is provided in terms of Lie algebraic structures. With the aim of providing a method to generate lattice configurations, a set of equations for coupling constants in terms of energies is obtained; this is done by means of a new formula for the calculation of characteristic polynomials. Two examples with randomly generated spectra are studied numerically, leading to peaked distributions of couplings. In the second part of the paper, our results are applied to the design of bent waveguides, reproducing specific spectra below propagation threshold. As a demonstration, the Dirac and the finite oscillator are realized in this way. A few partially isospectral configurations are also presented.
Performance of CID camera X-ray imagers at NIF in a harsh neutron environment
Palmer, N. E. [LLNL; Schneider, M. B. [LLNL; Bell, P. M. [LLNL; Piston, K. W. [LLNL; Moody, J. D. [LLNL; James, D. L. [LLNL; Ness, R. A. [LLNL; Haugh, M. J. [NSTec; Lee, J. J. [NSTec; Romano, E. D. [NSTec
2013-09-01T23:59:59.000Z
Charge-injection devices (CIDs) are solid-state 2D imaging sensors similar to CCDs, but their distinct architecture makes CIDs more resistant to ionizing radiation.1–3 CID cameras have been used extensively for X-ray imaging at the OMEGA Laser Facility4,5 with neutron fluences at the sensor approaching 109 n/cm2 (DT, 14 MeV). A CID Camera X-ray Imager (CCXI) system has been designed and implemented at NIF that can be used as a rad-hard electronic-readout alternative for time-integrated X-ray imaging. This paper describes the design and implementation of the system, calibration of the sensor for X-rays in the 3 – 14 keV energy range, and preliminary data acquired on NIF shots over a range of neutron yields. The upper limit of neutron fluence at which CCXI can acquire useable images is ~ 108 n/cm2 and there are noise problems that need further improvement, but the sensor has proven to be very robust in surviving high yield shots (~ 1014 DT neutrons) with minimal damage.
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
Center for Inverse Design poster for EFRC Summit, May 2011
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Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design
Miller, Owen D
2013-01-01T23:59:59.000Z
Photonic innovation is becoming ever more important in the modern world. Optical systems are dominating shorter and shorter communications distances, LED's are rapidly emerging for a variety of applications, and solar cells show potential to be a mainstream technology in the energy space. The need for novel, energy-efficient photonic and optoelectronic devices will only increase. This work unites fundamental physics and a novel computational inverse design approach towards such innovation. The first half of the dissertation is devoted to the physics of high-efficiency solar cells. As solar cells approach fundamental efficiency limits, their internal physics transforms. Photonic considerations, instead of electronic ones, are the key to reaching the highest voltages and efficiencies. Proper photon management led to Alta Device's recent dramatic increase of the solar cell efficiency record to 28.3%. Moreover, approaching the Shockley-Queisser limit for any solar cell technology will require light extraction to ...
Inverse Problems, Design and Optimization Symposium Jo~ao Pessoa, Brazil, August 25-27, 2010
Walker, D. Greg
Inverse Problems, Design and Optimization Symposium Jo~ao Pessoa, Brazil, August 25-27, 2010. Jorge Mechanical Engineering Institute Federal University of Itajub´a Itajub´a, MG, Brazil ariosto and Optimization Symposium Jo~ao Pessoa, Brazil, August 25-27, 2010 ## # # Thermocouples Heat source x y z Figure 1
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.
Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design
Miller, Owen Dennis
2012-01-01T23:59:59.000Z
design setup for thin-film solar cell. An initial anti-in randomly textured thin-film solar cells,” Optics Express,tion enhancement in thin-film solar cells using whispering
Inverse design and demonstration of a compact and broadband on-chip wavelength demultiplexer
Piggott, Alexander Y; Lagoudakis, Konstantinos G; Petykiewicz, Jan; Babinec, Thomas M; Vu?kovi?, Jelena
2015-01-01T23:59:59.000Z
Integrated photonic devices are poised to play a key role in a wide variety of applications, ranging from optical interconnects and sensors to quantum computing. However, only a small library of semi-analytically designed devices are currently known. In this paper, we demonstrate the use of an inverse design method that explores the full design space of fabricable devices and allows us to design devices with previously unattainable functionality, higher performance and robustness, and smaller footprints compared to conventional devices. We designed a silicon wavelength demultiplexer that splits $1300~\\mathrm{nm}$ and $1550~\\mathrm{nm}$ light from an input waveguide into two output waveguides, and fabricated and characterized several devices. The devices display low insertion loss $\\left(2 - 4~\\mathrm{dB}\\right)$, high contrast $\\left(12 - 17~\\mathrm{dB}\\right)$, and wide bandwidths $\\left(\\sim 100~\\mathrm{nm} \\right)$. The device footprint is $2.8 \\times 2.8 ~\\mathrm{\\mu m}$, making this the smallest dielectr...
Chen, Qingyan "Yan"
use efficiency are three important29 indices for heating, ventilation and air-conditioning (HVAC1 Inverse Design Methods for Indoor Ventilation Systems Using1 CFD-Based Multi equilibrium and require ventilation rates of12 a space to design ventilation systems for the space
Effectiveness of CID, HCD, and ETD with FT MS/MS for degradomic...
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of fragmentation methods namely CID-, HCD-, and ETD for FT MSMS analysis of human blood plasma peptidomic peptides. The peptidomic peptides were able to be identified from...
CID | U.S. DOE Office of Science (SC)
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CID Gas Recovery Biomass Facility | Open Energy Information
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Ratcliff, Robert R.
1989-01-01T23:59:59.000Z
as weak or nonexistent shock waves, a slowly increasing adverse pressure gradient to limit boundary layer separation, a center of pressure loca, tion giving a desirable pitch- ing moment, or an efficient spanwise loa. ding. The designer may also use wind...-tunnel tests of successful airfoils as an aid in picking a desirable pressure distribution. The direct-inverse technique has been successfully used in stretched and sheared Carte- sian coordinate systems' ' '' and most recently by Gaily ' in a curvilinear...
Chen, Qingyan "Yan"
1 Inverse design of the thermal environment in an airliner cabin by use of the1 CFD of thermal environment19 The design method is innovative for thermal environment20 The design used variables in less than 10 design cycles22 23 Abstract24 25 The current thermal environments in airliner
Design of Radiant Enclosures using Inverse and Non-linear Programming Techniques
Morton, David
vector x 2nd -order radiosity sensitivity vector #12;4 Greek Symbols k Step size ij Blockage factor Vector of design parameters (heater settings) #12;5 1. INTRODUCTION The design of radiant enclosures is to irradiate a design surface with heater surfaces located elsewhere in the enclosure. For example, the design
Center for Inverse Design: Inverse Design Approach
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Design of digital circuits using inverse-mode cascode SiGe HBTs for single event upset mitigation.
Thrivikraman, Tushar K. (Georgia Institute of Technology, Atlanta, GA); Phillips, Stanley D. (Georgia Institute of Technology, Atlanta, GA); Dodd, Paul Emerson; Cressler, John D. (Georgia Institute of Technology, Atlanta, GA); Marshall, Paul W. (Consultant to NASA, Brookneal, VA); Vizkelethy, Gyorgy; Marshall, Cheryl (NASA Goddard Space Flight Center, Greenbelt, MD); Wilcox, Edward (Georgia Institute of Technology, Atlanta, GA)
2010-07-01T23:59:59.000Z
We report on the design and measured results of a new SiGe HBT radiation hardening by design technique called the 'inverse-mode cascode' (IMC). A third-generation SiGe HBT IMC device was tested in a time resolved ion beam induced charge collection (TRIBICC) system, and was found to have over a 75% reduction in peak current transients with the use of an n-Tiedown on the IMC sub-collector node. Digital shift registers in a 1st-generation SiGe HBT technology were designed and measured under a heavy-ion beam, and shown to increase the LET threshold over standard npn only shift registers. Using the CREME96 tool, the expected orbital bit-errors/day were simulated to be approximately 70% lower with the IMC shift register. These measured results help demonstrate the efficacy of using the IMC device as a low-cost means for improving the SEE radiation hardness of SiGe HBT technology without increasing area or power.
Inverse Problems, Design and Optimization Symposium (IPDO-2013) Albi, France, June 26-28, 2013
Paris-Sud XI, Université de
OPTIMAL DESIGN OF ENERGY PRODUCTION AND STORAGE SYSTEMS IN BUILDINGS Aurélie Chabaud a,b , Julien Eynard a is being deregulated and decentralized energy production systems become more and more popular. That is why equipped with energy production and storage systems [8,9]. The impact of local energy production on
Torres-Verdín, Carlos
Design of Experiment and data-weighing inversion: Synthetic and field examples Renzo Angeles a, , Carlos synthetic or field data. This paper presents the development and field test of a new method to estimate-house and commercial reservoir simulators to model the processes of mud-filtrate invasion, acquisition of borehole
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 ...
Spectral imaging with a cid camera. Final report, 4 February 1982-14 September 1984
Tarbell, T.D.
1985-03-22T23:59:59.000Z
This report describes a program of spectral imaging observations of the solar atmosphere using the Sacromento Peak Vacuum Tower Telescope. The observations were obtained with Lockheed instruments including: an active tilt mirror for image motion compensation; polarization analyzer; narrowband tunable birefringent filter; photoelectric cid array camera; digital video image processor; and a microcomputer controller. Five observing runs were made, three of them with the entire system in operation. The images obtained were processed to measure magnetic and velocity fields in the solar photosphere with very high spatial resolution - 0.5 arcseconds on the best frames. Sets of these images have been studied to address three scientific problems; (1) The relationship among small magnetic flux tubes, downdrafts and granulation; (2) The puzzling flux changes in isolated magnetic features in a decaying active region; (3) The temporal power spectrum of the magnetogram signal in isolated flux tubes. Examples of the narrowband images are included in the report, along with abstracts and manuscripts of papers, resulting from this research.
Sze, L.K.; Cheung, C.S.; Leung, C.W. [Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong (China)
2006-01-01T23:59:59.000Z
Experiments were carried out to investigate the appearance, temperature distribution, and NO{sub x} emission index of two inverse diffusion flames, one with circumferentially arranged ports (CAPs) and the other with co-axial (CoA) jets, both burning LPG with 70% butane and 30% propane. Flame appearances were investigated first with a fixed fueling rate at different airflow rates equivalent to air jet Reynolds numbers (Re) of 1000 to 4500; and then at a fixed airflow rate with different fueling rates equivalent to overall equivalence ratios (F) of 1.0 to 2.0. The CAP flame is found to consist of two zones: a lower entrainment zone and an upper mixing and combustion zone. The CoA flame in most cases is similar to a diffusion flame. The two-zone structure can be observed only at Re larger than 2500. The temperature distributions of the flames are similar at overall equivalence ratios of 1.0 and 1.2 for Re=2500, except that the corresponding CoA flame is longer. The flame temperature is higher in the CAP flame than the CoA flame at higher overall equivalence ratios. A measurement of centerline oxygen concentrations shows that the oxygen concentration reaches a minimum value at a flame height of 50 mm in the CAP flame but decreases more gradually in the CoA flame. It can be concluded that there is more intense air-fuel mixing in a CAP flame than the CoA flame. Investigation of the emission index of NO{sub x} (EINO{sub x}) for both flames at Re=2500 and overall equivalence ratios of 1.0 to 6.0 reveals that the EINO{sub x} curve of each flame is bell-shaped, with a maximum value of 3.2 g/kg at F=1.2 for the CAP flame and 3 g/kg at F=2.2 for the CoA flame.
Center for Inverse Design: Publications
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Center for Inverse Design: Publications
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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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) | SciTech Connect Journal Article: X-ray lineARMParticipants1.1 Buildings SectorCMIfor|CareersPublications Principal
CID-miRNA: A web server for prediction of novel miRNA precursors in human genome
Tyagi, Sonika; Vaz, Candida [Centre for Computational Biology and Bioinformatics, School of Information Technology, Jawaharlal Nehru University, New Mehrauli Road, New Delhi 110067 (India); Gupta, Vipin; Bhatia, Rohit [Department of Computer Sciences, Netaji Subhash Institute of Technology, New Delhi (India); Maheshwari, Sachin [Department of Computer Sciences, Indian Institute of Technology, New Delhi (India); Srinivasan, Ashwin [IBM Research Lab, Indian Institute of Technology, New Delhi (India); Bhattacharya, Alok [Centre for Computational Biology and Bioinformatics, School of Information Technology, Jawaharlal Nehru University, New Mehrauli Road, New Delhi 110067 (India); School of Life Sciences, Jawaharlal Nehru University, New Delhi (India)], E-mail: alok.bhattacharya@gmail.com
2008-08-08T23:59:59.000Z
microRNAs (miRNA) are a class of non-protein coding functional RNAs that are thought to regulate expression of target genes by direct interaction with mRNAs. miRNAs have been identified through both experimental and computational methods in a variety of eukaryotic organisms. Though these approaches have been partially successful, there is a need to develop more tools for detection of these RNAs as they are also thought to be present in abundance in many genomes. In this report we describe a tool and a web server, named CID-miRNA, for identification of miRNA precursors in a given DNA sequence, utilising secondary structure-based filtering systems and an algorithm based on stochastic context free grammar trained on human miRNAs. CID-miRNA analyses a given sequence using a web interface, for presence of putative miRNA precursors and the generated output lists all the potential regions that can form miRNA-like structures. It can also scan large genomic sequences for the presence of potential miRNA precursors in its stand-alone form. The web server can be accessed at (http://mirna.jnu.ac.in/cidmirna/)
Locative Inversion In Cantonese
Mok, Sui-Sang
1992-01-01T23:59:59.000Z
This paper proposes that locative inversion is a widespread syntactic process in Cantonese. The sentence-initial locative phrases in the Locative Inversion sentences are argued to be subjects which come from the postverbal complement position...
Wavelet Domain Geophysical Inversion
Kane, Jonathan
2002-01-01T23:59:59.000Z
We present a non-linear method for solving linear inverse problems by thresholding coefficients in the
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
Wiederhold, Gio
Background and Refernces An extensive history First moving pictures: 1834, William George Horner management system (DBMS) is a collection of programs which uses computers to store, maintain, and interrogate the database. To support the DBMS we require not only hardware, by operating systems and file system services
Inverse Stochastic Linear Programming
2007-01-05T23:59:59.000Z
Pittsburgh, PA USA 15261. Lewis Ntaimo ... College Station, TX USA 77843. Abstract. Inverse ..... investments in the electricity generation industry. The instances ...
Maniraj, M.; Barman, Sudipta Roy [UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452001, Madhya Pradesh (India)] [UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452001, Madhya Pradesh (India)
2014-03-15T23:59:59.000Z
By imaging the spatial intensity distribution of the electrons from a Stoffel-Johnson (SJ) type low energy electron source for inverse photoemission spectroscopy (IPES), we find that the focus is distorted when the beam current exceeds the limiting value due to space charge effect. The space charge effect and the contact potential difference suppress the beam current at low energies (<10 eV). In this work, we show that these limitations of the SJ source can be overcome by compensation of the contact potential difference between the cathode and the lens electrodes and an uniform well focused electron beam with the set kinetic energy can be obtained. The size of the electron beam is around 1 mm full width at half maximum over the whole energy range of 5 to 30 eV generally used for IPES. The compensation of the contact potential difference also enhances the beam current substantially at low energies (<10 eV) and uniform beam current is achieved for the whole energy range. We find that the drift in the electron beam position is sensitive to the lens electrode separation and it is about 1 mm over the whole energy range. By measuring the n = 1 image potential state on Cu(100), we show that the resolution is better when the cathode filament current is set to lower values.
Center for Inverse Design: Modality 1 - Inverse Band Structure
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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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41cloth Documentation DataDepartment of EnergyOn-Farm1 ofCategorical ExclusionCategÂ·as PartinOpticalMPA-CINT Center
Inverse Folding of RNA Pseudoknot Structures
Gao, James Z M; Reidys, Christian M
2010-01-01T23:59:59.000Z
Background: RNA exhibits a variety of structural configurations. Here we consider a structure to be tantamount to the noncrossing Watson-Crick and \\pairGU-base pairings (secondary structure) and additional cross-serial base pairs. These interactions are called pseudoknots and are observed across the whole spectrum of RNA functionalities. In the context of studying natural RNA structures, searching for new ribozymes and designing artificial RNA, it is of interest to find RNA sequences folding into a specific structure and to analyze their induced neutral networks. Since the established inverse folding algorithms, {\\tt RNAinverse}, {\\tt RNA-SSD} as well as {\\tt INFO-RNA} are limited to RNA secondary structures, we present in this paper the inverse folding algorithm {\\tt Inv} which can deal with 3-noncrossing, canonical pseudoknot structures. Results: In this paper we present the inverse folding algorithm {\\tt Inv}. We give a detailed analysis of {\\tt Inv}, including pseudocodes. We show that {\\tt Inv} allows to...
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 ...
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
Structure of Laminar Sooting Inverse Diffusion Flames
Mikofski, Mark A
2007-01-01T23:59:59.000Z
Combust. Structure of Laminar Sooting Inverse Diffusion2002, p. 252. Structure of Laminar Sooting Inverse Diffusion219-226. Structure of Laminar Sooting Inverse Diffusion
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
Center for Inverse Design: Staff Biographies
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Inverse Design Summer School brochure, Sept 2011
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Center for Inverse Design: Need Help?
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Center for Inverse Design Home Page
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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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41clothThe Bonneville PowerTariff Pages default Sign In AboutIs gravity a7 12 BONNEVILLEMinoritiesTwo SignInventors inInverse
A study of generalized inverses
McKinney, Nancy Lee
1973-01-01T23:59:59.000Z
A STUDY OF GENERALIZED INVERSES A Thesis by NANCY LEE MCKINNEY Submitted to the Graduate College of Texas ASM University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE August 1973 Major Subject: Mathematics A... STUDY OF GENERALIZED INVERSES A Thesis by NANCY LEE MCKINNEY Approved as to style and content by: airman o ittee Hea o epartment e er Me er August 1973 ABSTRACT A Study of Generalized Inverses. (August 1973) Nancy Lee NcKinney, B. A...
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 folding of RNA pseudoknot structures
Gao, James Z M; Reidys, Christian M
2009-01-01T23:59:59.000Z
Results: In this paper we present the inverse folding algorithm {\\tt inv} as well as two applications. We give a detailed analysis of {\\tt inv}, including pseudocodes. The algorithm is freely available at \\url{http://www.combinatorics.cn/cbpc/inv.html}. We show, using 3-noncrossing nonplanar RNA pseudoknot structures as an example, that {\\tt inv} allows to design specific 3-noncrossing RNA structures. Furthermore we use {\\tt inv} for estimating the distance of the neutral networks. Conclusions: The algorithm {\\tt inv} extends inverse folding capabilities to RNA pseudoknot structures. In comparison with {\\tt RNAinverse} it uses new ideas, for instance by taking sets of competing structures into consideration. As a result, {\\tt inv} is able to find novel sequences even for RNA secondary structures.
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
Requirements and Designs for Mars Rover RTGs
Schock, Alfred; Shirbacheh, M; Sankarankandath, V
2012-01-19T23:59:59.000Z
The current-generation RTGs (both GPHS and MOD) are designed for operation in a vacuum environment. The multifoil thermal insulation used in those RTGs only functions well in a good vacuum. Current RTGs are designed to operate with an inert cover gas before launch, and to be vented to space vacuum after launch. Both RTGs are sealed with a large number of metallic C-rings. Those seals are adequate for retaining the inert-gas overpressure during short-term launch operations, but would not be adequate to prevent intrusion of the Martian atmospheric gases during long-term operations there. Therefore, for the Mars Rover application, those RTGs just be modified to prevent the buildup of significant pressures of Mars atmosphere or of helium (from alpha decay of the fuel). In addition, a Mars Rover RTG needs to withstand a long-term dynamic environment that is much more severe than that seen by an RTG on an orbiting spacecraft or on a stationary planetary lander. This paper describes a typical Rover mission, its requirements, the environment it imposes on the RTG, and a design approach for making the RTG operable in such an environment. Specific RTG designs for various thermoelectric element alternatives are presented.; Reference CID #9268 and CID #9276.
Center for Inverse Design: Organization of the Center for Inverse Design
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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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt DocumentationSitesWeather6 Shares of U.S.Career Opportunities forLight EmittingLEDEFRC
Inverse differential kinematics Statics and force transformations
De Luca, Alessandro
;Damped Least Squares method ! inversion of differential kinematics as an optimization problem ! function
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
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
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.
Instructor: Gus Hart CID & NAME
Hart, Gus
S kB ln f(x, t) = A sin(kx - t + ) sin = 1/mach# f2/f1 = 21/12 n k = n! k!(n - k)! P = 1 2 µ2 A2 v sin bright = m (Bragg) n = tan p t2 = t1 L2 = L1/ x = (x - vt) p = mv = 1 1 - 2 = v c f = f 1 ± 1C = 1 - Tc Th (Carnot engine efficiency) e = 1 - 1 (V1/V2)-1 (Otto cycle) dS = dQr T Weng = |Qh| - |Qc
Transmission Eigenvalues in Inverse Scattering Theory
2012-04-22T23:59:59.000Z
TE and Scattering Theory. Spherically Stratified Media. Transmission Eigenvalues. Open Problem. Transmission Eigenvalues in Inverse. Scattering Theory.
Radon Transform Inversion using the Shearlet Representation
Labate, Demetrio
Radon Transform Inversion using the Shearlet Representation Flavia Colonna Department The inversion of the Radon transform is a classical ill-posed inverse problem where some method-optimal rate of convergence in estimating a large class of images from noisy Radon data. This is achieved
Inverse Temperature-Dependent Pathway of Cellulose Decrystallization...
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Inverse Temperature-Dependent Pathway of Cellulose Decrystallization in Trifluoroacetic Acid. Inverse Temperature-Dependent Pathway of Cellulose Decrystallization in...
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.
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.
Inversion Methods for Determining Tsunami Source Amplitudes
Percival, Don
Inversion Methods for Determining Tsunami Source Amplitudes from DART Buoy Data Don Percival: given data from DART buoys and models for unit magnitude earthquakes from various tsunami source
Transmission Eigenvalues in Inverse Scattering Theory
Title: Transmission Eigenvalues in Inverse Scattering Theory Abstract: The transmission eigenvalue problem is a new class of eigenvalue problems that has
The Generalized Stieltjes Transform and Its Inverse
John H. Schwarz
2004-05-18T23:59:59.000Z
The generalized Stieltjes transform (GST) is an integral transform that depends on a parameter $\\rho > 0$. In previous work a convenient form of the inverse transformation was derived for the case $\\rho = 3/2$. This paper generalizes that result to all $\\rho > 0$. It is a well-known fact that the GST can be formulated as an iterated Laplace transform, and that therefore its inverse can be expressed as an iterated inverse Laplace transform. The form of the inverse transform derived here is a one-dimensional integral that is considerably simpler.
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.
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...
INVERSE OBSTACLE SCATTERING FOR ELASTIC WAVES 1 ...
2015-03-04T23:59:59.000Z
scientific areas such as seismic tomography, non-destructive testing, and medical imaging. The underlying mathematical problems are known as the inverse ...
Coupled Physics Inverse Problems: EIT meets MRI
2013-11-14T23:59:59.000Z
Nov 14, 2014 ... Coupled Physics Inverse Problems: EIT meets MRI. Carlos Montalto. Department of Mathematics cmontalto@math.purdue.edu. November 14 ...
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.
A General Framework for Nonlinear Multigrid Inversion
cost. . . . . . . . . 9 2 Pseudocode specification of a twogrid inversion algorithm. The notation c) and r (q+1) explicit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3 Pseudocode 4 Pseudocode specification of fixed grid and multigrid inversion methods for ODT problem showing (a
Inversion of the attenuated Radon transform
MÃ¼nster, WestfÃ¤lische Wilhelms-UniversitÃ¤t
Inversion of the attenuated Radon transform F. Natterer Institut fur Numerische und instrumentelle@math.uni-muenster.de Abstract We derive an exact inversion formula for the attenuated Radon transform. The formula is closely for x 2 IR2, #12; 2 S1 Dax; #12; = 1Z 0 ax + t#12;dt : 1.1 The attenuated Radon transform Ra is de ned
Solving Stochastic Inverse Problems: A Sparse Grid
Zabaras, Nicholas J.
Solving Stochastic Inverse Problems: A Sparse Grid Collocation Approach N. Zabaras Cornell to large scale problems. To solve large-scale problems involving high-dimensional stochastic spaces (in Methods for Large-Scale Inverse Problems and Quantification of Uncertainity. Edited by People on Earth c
Solving Generalized Small Inverse Problems Noboru Kunihiro
International Association for Cryptologic Research (IACR)
Solving Generalized Small Inverse Problems Noboru Kunihiro The University of Tokyo, Japan kunihiro@k.u-tokyo.ac.jp Abstract. We introduce a "generalized small inverse problem (GSIP)" and present an algorithm for solving such that the target problem can be solved in polynomial time in log M in an explicit form. Since GSIPs in- clude some
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 ...
Center for Inverse Design: Partner Institutions in the Center for Inverse
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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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt DocumentationSitesWeather6 Shares of U.S.Career Opportunities forLight EmittingLEDEFRCDesign
Center for Inverse Design: Collaboration Tool for the Center for Inverse
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) | SciTech Connect Journal Article: X-ray lineARMParticipants1.1 Buildings SectorCMIfor|Careers atAnPeople
COLLOQUIUM: Seismic Imaging and Inversion Based on Spectral-Element...
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anisotropy, shear attenuation and impedance contrasts. We apply this method to study seismic inverse problems at various scales, from exploration-scale full-waveform inversion...
Flame Height Measurement of Laminar Inverse Diffusion Flames
Mikofski, Mark A.; Williams, Timothy C.; Shaddix, Christopher R.; Blevins, Linda G.
2006-01-01T23:59:59.000Z
Flame Height Measurement of Laminar Inverse Diffusion Flamesinverse diffusion flame, laminar, flame height, OH, laserair and methane-air laminar inverse diffusion flames were
Joint inversion of electrical and seismic data for Fracture char...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
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. and...
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.
Center for Inverse Design: Modality 3 - Discovery of Missing Materials
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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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41cloth Documentation DataDepartment of EnergyOn-Farm1 ofCategorical ExclusionCategÂ·as PartinOpticalMPA-CINT3: Discovery
Inverse transonic wing design on a vector processer
Anderson, William Kyle
1982-01-01T23:59:59.000Z
) Now, in this method the wing is assumed to be placed between grid 1'nes (see Fig. 2 ), and suff'ciently thin so tha the boundary cor;di- tions can be applied at Z=O. This technique of applying the fu' 1 oo- tent al boundary condit'on at Z=O (which...
Center for Inverse Design Highlight: Iron Chalcogenide PV Absorbers
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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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt DocumentationSitesWeather6 Shares of U.S.Career Opportunities forLight EmittingLED
Center for Inverse Design: EFRC Researchers in Focus (Text Version)
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt DocumentationSitesWeather6 Shares of U.S.Career Opportunities forLight EmittingLEDEFRC Researchers in
Center for Inverse Design: Lost SharePoint Password?
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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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt DocumentationSitesWeather6 Shares of U.S.Career Opportunities forLight EmittingLEDEFRC Researchers
Center for Inverse Design: Principal Investigators in the Center for
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt DocumentationSitesWeather6 Shares of U.S.Career Opportunities forLight
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt DocumentationSitesWeather6 Shares of U.S.Career Opportunities forLightResearch Thrusts and Subtasks
Center for Inverse Design: EFRC Researchers in Focus
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) | SciTech Connect Journal Article: X-ray lineARMParticipants1.1 Buildings SectorCMIfor|Careers atAnPeopleEFRC
Water Budget Analysis and Groundwater Inverse Modeling
Farid Marandi, Sayena
2012-07-16T23:59:59.000Z
hydrological processes at the Norman Landfill site including evapotranspiration, recharge, and regional groundwater flow and groundwater-surface water interaction. The MCMC scheme also proved to be a robust tool for the inverse groundwater modeling but its...
A General Framework for Nonlinear Multigrid Inversion
cost. . . . . . . . . 9 2 Pseudo-code specification of a two-grid inversion algorithm. The notation c) explicit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3 Pseudo-code specification of (a grid update. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 Pseudo-code
FAST SPARSE SELECTED INVERSION 1. Introduction. Extracting ...
2015-07-06T23:59:59.000Z
nal blocks of the inverse of a sparse symmetric matrix A, using the multifrontal method and rank structures. ..... To construct an HSS form, the HSS blocks are compressed hierarchically in a bottom-up ...... seismic modeling of the earth media.
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.
Avoidable Sets in The Bicyclic Inverse Semigroup Nandor Sieben
Sieben, Nándor
Avoidable Sets in The Bicyclic Inverse Semigroup N´andor Sieben 9/2/2003 Abstract A subset U elements of B. The avoidable sets of the bicyclic inverse semigroup are classified. 1. Introduction If (S avoidable sets in the bicyclic inverse semigroup, which is perhaps the most important inverse semigroup. Its
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
Hellebrand, Sybille
instruments. Design and analysis of reliable and computationally effective mathematical solution methods on computational methods for inverse problems in imaging is held at University of Eastern Finland, Kuopio campus in the fields of mathematics, physics or engineering with an interest towards inverse problems. The school
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
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.
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.
Fast bias inversion of a double well without residual particle excitation
S. Martínez-Garaot; M. Palmero; D. Guéry-Odelin; J. G. Muga
2015-07-14T23:59:59.000Z
We design fast bias inversions of an asymmetric double well so that the lowest states in each well remain so and free from residual motional excitation. This cannot be done adiabatically, and a sudden bias switch produces in general motional excitation. The residual excitation is suppressed by complementing a predetermined fast bias change with a linear ramp whose time-dependent slope compensates for the displacement of the wells. The process, combined with vibrational multiplexing and demultiplexing, can produce vibrational state inversion without exciting internal states, just by deforming the trap.
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
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
Inverse Problems in Engineering (Publisher: Taylor & Francis)
Vajda, Sandor
detailed Tables of Laplace transform pairs and employing some basic properties. A more recent alternative1 Inverse Problems in Engineering (Publisher: Taylor & Francis) Volume 10, Number 5, Year 2002, pp. Valkó1 and Sandor Vajda2 1 Harold Vance Department of Petroleum Engineering, Texas A&M University mail
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
Transdimensional Approaches to Geophysical Inverse Problems
Bodin, Thomas
complicated and quantitative mechanisms with simple qualitative concepts. This research was supported underTransdimensional Approaches to Geophysical Inverse Problems Thomas Bodin October 2010 A thesis Except where otherwise indicated in the text, the research described in this thesis is my own original
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
An inverse of the modular invariant
Semjon Adlaj
2011-10-14T23:59:59.000Z
During the last few years of his life, Ramanujan had adamantly tried to invert the modular invariant. Subsequent efforts failed until May 30, 2011 when an explicit closed formula for an inverse was presented at the CCRAS (Moscow, Russia). This very formula, along with some special values of the modular invariant, is given in this paper.
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...
Lagaris, Isaac
2007-01-01T23:59:59.000Z
on the solution of the one-dimensional single channel inverse scattering is proposed for the design of quantum; Inverse scattering 1. Introduction The inverse scattering problem on the line [14] was the subject scattering techniques in one dimension has been made despite their huge prospects in a variety of fields
Nonlinear Integral Equations for the Inverse Problem in Corrosion ...
2012-06-15T23:59:59.000Z
Nonlinear Integral Equations for the Inverse. Problem in Corrosion Detection from Partial. Cauchy Data. Fioralba Cakoni. Department of Mathematical Sciences, ...
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
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.
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
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.
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...
Lagrange Inversion via Transforms Heinrich Niederhausen
Niederhausen, Heinrich
is called the order of , n = ord( ), and the set of all Laurent series is denoted by K btc. As indicated in K btc is de...ned as multiplication of series. A multi- plicative inverse (reciprocal) exists in K btc 0 K btc, the set of all Laurent series where the ...rst non-zero term is a unit in K, i.e. has
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.
Note: Low energy inverse photoemission spectroscopy apparatus
Yoshida, Hiroyuki, E-mail: yoshida@e.kuicr.kyoto-u.ac.jp [Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 (Japan)] [Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011 (Japan)
2014-01-15T23:59:59.000Z
An apparatus for the low-energy inverse photoemission spectroscopy is described. In this technique, low energy electron having kinetic energy below 4 eV is incident to the sample and detect the emitted photons in the near ultraviolet range (below 5 eV, longer than 250 nm) to investigate the unoccupied states of the solid materials. Compared with the prototype apparatus reported previously [H. Yoshida, Chem. Phys. Lett. 539–540, 180–185 (2012)], the collection efficiency of photons is improved by a factor of four and practically any conductive substrates can be used. The overall resolution is 0.27 eV.
The Lorentz Integral Transform and its Inversion
N. Barnea; V. D. Efros; W. Leidemann; G. Orlandini
2009-12-23T23:59:59.000Z
The Lorentz integral transform method is briefly reviewed. The issue of the inversion of the transform, and in particular its ill-posedness, is addressed. It is pointed out that the mathematical term ill-posed is misleading and merely due to a historical misconception. In this connection standard regularization procedures for the solution of the integral transform problem are presented. In particular a recent one is considered in detail and critical comments on it are provided. In addition a general remark concerning the concept of the Lorentz integral transform as a method with a controlled resolution is made.
Elber, Ron
A brief description of the protein-folding and inverse-folding problems is provided. Design of energy are applied to estimate the sequence capacity of all known protein folds, and to compute the evolutionary for recognition of protein folds, and conclude with an application to protein evolution, studying the sequence
Center for Inverse Design: Modality 2 - Design of Materials with Targeted
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41cloth Documentation DataDepartment of EnergyOn-Farm1 ofCategorical ExclusionCategÂ·as PartinOpticalMPA-CINT
Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design
Miller, Owen Dennis
2012-01-01T23:59:59.000Z
of state-of-the-art photovoltaic cells,” Progress ineffective way. Photovoltaic cells are the most promisingthe absorptivity of photovoltaic cell: the material absorp-
Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design
Miller, Owen Dennis
2012-01-01T23:59:59.000Z
Surface Textures for Sub-Wavelength Solar Cells 7.1 Problemhigh-efficiency III-V cells,” Solar Cells, vol. 30, pp. 337–Limit 4 Analysis of next-generation solar cells 4.1 Carrier
Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design
Miller, Owen Dennis
2012-01-01T23:59:59.000Z
Version 39),” Progress in Photovoltaics: Research andVersion 36),” Progress in Photovoltaics: Research andVersion 31),” Progress in Photovoltaics: Research and
Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design
Miller, Owen Dennis
2012-01-01T23:59:59.000Z
efficiency tables (Version 39),” Progress in Photovoltaics:efficiency tables (Version 36),” Progress in Photovoltaics:efficiency tables (Version 31),” Progress in Photovoltaics:
Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design
Miller, Owen Dennis
2012-01-01T23:59:59.000Z
V OC ), and (b) short-circuit current (J SC ), as a functionalmost the same short-circuit current as the other twoV OC , but not on short-circuit current, J SC , for a 3µm
Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design
Miller, Owen Dennis
2012-01-01T23:59:59.000Z
enhancement of solar energy conversion,” Nano Letters, vol.of photovoltaic solar energy conversion,” Solar Energy65] P. Wurfel, “Solar energy conversion with hot electrons
Approaching the Island of Inversion: 34P
Bender, P.C.; Hoffman, C.R.; Wiedeking, M.; Allmond, J.M.; Bernstein, L.A.; Burke, J.T.; Bleuel, D.L.; Clark, R.M.; Fallon, P.; Goldblum, B.L.; Hinners, T.A.; Jeppesen, H.B.; Lee, Sangjin; Lee, I.Y.; Lesher, S.R.; Machiavelli, A.O.; McMahan, M.A.; Morris, D.; Perry, M.; Phair, L.; Scielzo, N.D.; Tabor, S.L.; Tripathi, Vandana; Volya, A.
2011-06-14T23:59:59.000Z
Yrast states in 34P were investigated using the 18O(18O,pn) reaction at energies of 20, 24, 25, 30, and 44 MeV at Florida State University and at Lawrence Berkeley National Laboratory. The level scheme was expanded, ray angular distributions were measured, and lifetimes were inferred with the Doppler-shift attenuation method by detecting decay protons in coincidence with one or more rays. The results provide a clearer picture of the evolution of structure approaching the 'Island of Inversion', particularly how the 1 and 2 particle-hole (ph) states fall in energy with increasing neutro number approaching inversion. However, the agreement of the lowest few states with pure sd shell model predictions shows that the level scheme of 34P is not itself inverted. Rather, the accumulated evidence indicates that the 1-ph states start at 2.3 MeV. A good candidate for the lowest 2-ph state lies at 6236 keV, just below the neutron separation energy of 6291 keV. Shell model calculations made using a small modification of the WBP interaction reproduce the negative-parity, 1-ph states rather well.
Speaker and Title Information -- Inverse Problems Conference in ...
Margaret Cheney, Radar Imaging, Friday, 11:00–11:45. David Colton, Transmission Eigenvalues and Inverse Scattering Theory, Thursday, 11:00–11:
Globally strictly convex cost functional for an inverse parabolic problem
Michael V. Klibanov; Vladimir G. Kamburg
2015-02-04T23:59:59.000Z
A coefficient inverse problem for a parabolic equation is considered. Using a Carleman Weight Function, a globally strictly convex cost functional is constructed for this problem.
STABILITY OF COUPLED-PHYSICS INVERSE PROBLEMS WITH ...
2014-03-27T23:59:59.000Z
we do not introduce additional solution to the inverse problem. For 0 system by taking ..... conductivity from power densities in dimension n 3, Communications in Partial.
The Inverse Problem for Derivative Securities of Interest Rate
2008-02-02T23:59:59.000Z
May 26, 2000 ... Market price for risk of interest rate reflects the close relation between risk and yield of securities dependent on interest rate. An inverse problem.
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,...
Stochastic spectral methods for Bayesian inference in inverse ...
... CA The Bayesian approach to inverse problems provides a foundation for inference from noisy and limited data, a natural mechanism for regularization in the ...
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...
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...
Design Editorial Design Innovation
Papalambros, Panos
juxtaposition of innovation versus invention: "Invention is the first occurrence of an idea for a new product such as innovation strategies, product design, service inno- vation, cutting-edge designers, design awards, and green design. Much of that perspective on innovation is then tied to industrial or product design, often
An inverse problem for Schwinger pair production
Hebenstreit, Florian
2015-01-01T23:59:59.000Z
The production of electron-positron pairs in time-dependent electric fields (Schwinger mechanism) depends non-linearly on the applied field profile. Accordingly, the resulting momentum spectrum is extremely sensitive to small variations of the field parameters. Owing to this non-linear dependence it is so far unpredictable how to choose a field configuration such that a predetermined momentum distribution is generated. We show that quantum kinetic theory along with optimal control theory can be used to approximately solve this inverse problem for Schwinger pair production. We exemplify this by studying the superposition of a small number of harmonic components resulting in predetermined signatures in the asymptotic momentum spectrum. In the long run, our results could facilitate the observation of this yet unobserved pair production mechanism in quantum electrodynamics by providing suggestions for tailored field configurations.
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.
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.
"Inverse Sandwichâ? Complexes of Perhalogenated Cyclohexasilane
Dai, Xuliang; Shulz, Douglas; Braun, Christopher; Ugrinov, Angel; and Boudjouk, Philip
2010-04-20T23:59:59.000Z
Perhalogenated cyclohexasilanes, Si{sub 6}X{sub 12} (X = Cl, Br), were prepared by reaction of Si{sub 6}H{sub 12} with molecular chlorine or bromine in cold (-89 C) dichloromethane. Single-crystal structural determination by X-ray analysis shows that the six silicon atoms comprising Si{sub 6}Br{sub 12} adopt a chair conformation in the solid state. The addition of p-tolunitrile to Si{sub 6}X{sub 12} (X = Cl, Br) leads to the rapid formation of colorless precipitates. Si{sub 6}Br{sub 12} 3 2(p-CH{sub 3}C{sub 6}H{sub 4}CN) adopts an 'inverse sandwich' structure where the N atoms of the p-tolunitrile molecules are {micro}{sub 6} bonded and are located above and below the planar hexagonal Si{sub 6} ring. In conclusion, Si{sub 6}X{sub 12} (X = Cl, Br) was synthesized by molecular halogenation of Si{sub 6}H{sub 12} in high yield and good purity. Perhalogenated cyclohexasilanes react with p-tolunitrile to give 'inverse sandwich' adducts 3 and 4 with a planar Si{sub 6} ring upon coordination. Our future reports will detail dianionic adducts based on tetra-n-butylammonium halides as well as a monoanionic adamantyl azide adduct of Si{sub 6}Cl{sub 12}. It is straightforward to conceptualize the utility of Si{sub 6}X{sub 12} {center_dot} Ln chemistry in molecular assembly of silicon-based clusters/tubes/wires. Thereby, we proffer that this constitutes a new landscape in Si chemistry.
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
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
Inverses of Multivariate Polynomial Matrices using Discrete Convolution
Young, R. Michael
Inverses of Multivariate Polynomial Matrices using Discrete Convolution R. Lobo Dept. of Elec Raleigh, NC 27695 Abstract-- A new method for inversion of rectangular matrices in a multivariate to multivariate polynomial system of equations is the subject of intensive research and has major applications
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
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
Introduction to Inverse Kinematics with Jacobian Transpose, Pseudoinverse and Damped
Chai, Jinxiang
Introduction to Inverse Kinematics with Jacobian Transpose, Pseudoinverse and Damped Least Squares method, the pseudoinverse method, and the damped least squares methods for inverse kinematics (IK], pseudoinverse methods [45], Jacobian transpose methods [5, 46], the Levenberg-Marquardt damped least squares
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
DYNAMIC INVERSE PROBLEM IN A WEAKLY LATERALLY INHOMOGENEOUS MEDIUM.
problem is mainly solved by means of the map migration method. The map migration method assumes of an independent way to recover the velocity profile above the interface may hinder the map migration techniques on depth, z, inverse problems of geophysics are often reduced to one-dimensional inverse problems
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...
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...
Joint inversion of receiver function and ambient noise based on Bayesian theory
van der Hilst, Robert D.
In this study, we present a method for the joint inversion of receiver function and ambient noise based on Bayesian inverse theory (Tarantola, 1987, 2005). The nonlinear inversion method of the complex spectrum ratio of ...
Conceptual aircraft dynamics from inverse aircraft modeling
Ziegler, Gregory E
1999-01-01T23:59:59.000Z
This thesis presents a method of construe' ting a nonlinear dynamics model of a theoretical aircraft from the nonlinear batch simulation of an existing aircrew This method provides control law designers with a method of fabricating nonlinear models...
Conceptual aircraft dynamics from inverse aircraft modeling
Ziegler, Gregory E
1999-01-01T23:59:59.000Z
This thesis presents a method of construe' ting a nonlinear dynamics model of a theoretical aircraft from the nonlinear batch simulation of an existing aircrew This method provides control law designers with a method of fabricating nonlinear models...
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...
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.
Linearized inverse scattering based on seismic Reverse Time Migration
Tim J. P. M. Op 't Root; Christiaan C. Stolk; Maarten V. de Hoop
2011-01-21T23:59:59.000Z
In this paper we study the linearized inverse problem associated with imaging of reflection seismic data. We introduce an inverse scattering transform derived from reverse-time migration (RTM). In the process, the explicit evaluation of the so-called normal operator is avoided, while other differential and pseudodifferential operator factors are introduced. We prove that, under certain conditions, the transform yields a partial inverse, and support this with numerical simulations. In addition, we explain the recently discussed 'low-frequency artifacts' in RTM, which are naturally removed by the new method.
Inverse Freezing in Mean-Field Models of Fragile Glasses
Mauro Sellitto
2006-05-25T23:59:59.000Z
A disordered spin model suitable for studying inverse freezing in fragile glass-forming systems is introduced. The model is a microscopic realization of the ``random-first order'' scenario in which the glass transition can be either continuous or discontinuous in thermodynamic sense. The phase diagram exhibits a first-order transition line between two fluid phases terminating at a critical point. When the interacting degrees of freedom are entropically favoured an inverse static glass transition and a double inverse dynamic freezing appear.
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...
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
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.
Forward and inverse metabolic engineering strategies for improving polyhydroxybyrate production
Tyo, Keith E. J
2008-01-01T23:59:59.000Z
Forward metabolic engineering (FME) is a rational approach to cellular engineering, relying on an understanding of the entire metabolic network to direct perturbations for phenotype improvement. Conversely, inverse metabolic ...
SOFTWARE Open Access RNAexinv: An extended inverse RNA folding from
Barash, Danny
SOFTWARE Open Access RNAexinv: An extended inverse RNA folding from shape and physical attributes problem that aims to predict the secondary structure of a given RNA sequence. Software packages are nowa
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 ...
STOCHASTIC INVERSE PROBLEM WITH NOISY -APPLICATION TO AERONAUTICAL MODEL -
Klein, Thierry
STOCHASTIC INVERSE PROBLEM WITH NOISY SIMULATOR - APPLICATION TO AERONAUTICAL MODEL - by Nabil-based method to estimate aeronautic parameters in a Fuel mass model. We use an analytical model that can
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.
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...
Effects of surface scattering in full-waveform inversion
Rondenay, Stephane
In full-waveform inversion of seismic body waves, often the free surface is ignored on grounds of computational efficiency. A synthetic study was performed to investigate the effects of this simplification. In terms of ...
A multitask learning perspective on acoustic-articulatory inversion
Richmond, Korin
2007-01-01T23:59:59.000Z
This paper proposes the idea that by viewing an inversion mapping MLP from a Multitask Learning perspective, we may be able to relax two constraints which are inherent in using electromagnetic articulography as a source ...
Ultrasonic quantitative NDE of layered media: the inverse problem
Jaminet, Paul Thomas
1993-01-01T23:59:59.000Z
knowing any of them. Results are presented for several single plates and three-layer specimens: aluminum, titanium, stainless steel, tungsten, Plexiglas, aluminum/water/aluminum, aluminum/water/titanium, and titanium/water/titanium. Successful inversion...
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 ...
Advances in Inverse Transport Methods and Applications to Neutron Tomography
Wu, Zeyun
2011-02-22T23:59:59.000Z
The purpose of the inverse-transport problems that we address is to reconstruct the material distribution inside an unknown object undergoing a nondestructive evaluation. We assume that the object is subjected to incident ...
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...
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.
Using inverse scattering methods to study inter-nucleus potentials
R S Mackintosh; S G Cooper
1998-03-05T23:59:59.000Z
It is now straightforward to carry out S-matrix to potential inversion over a very wide range of energies and for a wide range of projectile-target combinations. Inversion is possible in many cases involving spin. IP inversion also permits direct scattering data-to-potential inversion and furnishes powerful tools for the phenomenological analysis of nuclear scattering. The resulting single particle potentials exhibit various generic properties which challenge fundamental reaction theories as well as yield information on densities, provide input for reaction calculations. S-matrix to potential inversion is also a powerful tool for directly investigating theoretical processes which contribute to inter-nuclear potentials. Various studies have given insight into contributions to the dynamic polarisation potential (DPP) due to breakup processes and due to collective and reaction channel coupling and have also illuminated the role played by exchange processes in leading to non-locality and parity dependence of the potentials. A case study involving d + He-4 is a model for ways in which inversion applied jointly to theory and experiment might illuminate the scattering of exotic nuclei.
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.
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
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
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...
Oldenburg, Douglas W.
this problem we design a methodology for inverting magnetic data for subsurface magnetization, as opposed to magnetic susceptibility. Our approach contains flexibility to obtain different types of magnetization3D magnetic inversion for total magnetization in areas with complicated remanence Peter G. Leli
On the computational complexity of sequence design problems
Hart, W.E. [Sandia National Labs., Albuquerque, NM (United States)
1997-12-01T23:59:59.000Z
Inverse protein folding concerns the identification of an amino acid sequence that folds to a given structure. Sequence design problems attempt to avoid the apparant difficulty of inverse protein folding by defining an energy that can be minimized to find protein-like sequences. We evaluate the practical relevance of two sequence design problems by analyzing their computational complexity. We show that the canonical method of sequence design is intractable and describe approximation algorithms for this problem. We also describe an efficient algorithm that exactly solves the grand canonical method. Our analysis shows how sequence design problems can fail to reduce the difficulty of the inverse protein folding problem and highlights the need to analyze these problems to evaluate their practical relevance. 10 refs., 8 figs.
On the computational complexity of sequence design problems
Hart, W.E. [Sandia National Labs., Albuquerque, NM (United States). Algorithms and Discrete Mathematics Dept.
1996-12-31T23:59:59.000Z
Inverse protein folding concerns the identification of an amino acid sequence that folds to a given structure. Sequence design problems attempt to avoid the apparent difficulty of inverse protein folding by defining an energy that can be minimized to find protein-like sequences. The authors evaluate the practical relevance of two sequence design problems by analyzing their computation complexity. They show that the canonical method of sequence design is intractable, and describe approximation algorithms for this problem. The authors also describe an efficient algorithm that exactly solves the grand canonical method. The analysis shows how sequence design problems can fail to reduce the difficulty of the inverse protein folding problem, and highlights the need to analyze these problems to evaluate their practical relevance.
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.
Material model calibration through indentation test and stochastic inverse analysis
Buljak, Vladimir
2015-01-01T23:59:59.000Z
Indentation test is used with growing popularity for the characterization of various materials on different scales. Developed methods are combining the test with computer simulation and inverse analyses to assess material parameters entering into constitutive models. The outputs of such procedures are expressed as evaluation of sought parameters in deterministic sense, while for engineering practice it is desirable to assess also the uncertainty which affects the final estimates resulting from various sources of errors within the identification procedure. In this paper an experimental-numerical method is presented centered on inverse analysis build upon data collected from the indentation test in the form of force-penetration relationship (so-called indentation curve). Recursive simulations are made computationally economical by an a priori model reduction procedure. Resulting inverse problem is solved in a stochastic context using Monte Carlo simulations and non-sequential Extended Kalman filter. Obtained re...
Inverse scattering for a specific resonating group model nonlocality
Pantis, G.; Sofianos, S.A. [Department of Physics, University of South Africa, Pretoria (South Africa)] [Department of Physics, University of South Africa, Pretoria (South Africa)
1996-10-01T23:59:59.000Z
An inverse scattering method of Lipperheide and Fiedeldey [Z. Phys. A {bold 286}, 45 (1978); {bold 301}, 81 (1981)] has been used to construct an energy-dependent potential from the elastic-scattering phase shifts of the recently developed {ital K} model of Kaneko, LeMere, and Tang [Phys. Rev. C {bold 44}, 1588 (1991); {bold 46}, 298 (1992)] for the {ital n}{minus}{alpha} and {ital n}{minus}{sup 40}Ca systems. The local momentum of the inversion potential is subsequently used to recover the Wigner transforms of the {ital K} model. The results obtained indicate that it is possible to find, via inversion, an {ital l}-independent Wigner transform, which, when calculated at all energies, can provide us with the full nonlocality. {copyright} {ital 1996 The American Physical Society.}
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 ...
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.
The Generalized Mader's Inversion Formulas for the Radon Transforms
Yuri A. Antipov; Boris Rubin
2011-03-11T23:59:59.000Z
In 1927 Philomena Mader derived elegant inversion formulas for the hyperplane Radon transform on $\\bbr^n$. These formulas differ from the original ones by Radon and seem to be forgotten. We generalize Mader's formulas to totally geodesic Radon transforms in any dimension on arbitrary constant curvature space. Another new interesting inversion formula for the $k$-plane transform was presented in the recent book "Integral geometry and Radon transform" by S. Helgason. We extend this formula to arbitrary constant curvature space. The paper combines tools of integral geometry and complex analysis.
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.
An inverse random source problem for the Helmholtz equation
Gang Bao; Shui-Nee Chow; Peijun Li; Haomin Zhou
2013-10-25T23:59:59.000Z
Jun 10, 2013 ... use electric or magnetic measurements on the surface of the human body, such as the head, to infer the source currents inside of the body, such as the brain, that .... for the solution of the boundary value problem, which allows us to ... analysis for the direct and inverse source scattering problems in the rest ...
An inverse random source scattering problem in inhomogeneous ...
P Li
2011-02-03T23:59:59.000Z
Feb 4, 2011 ... on the surface of the human body, such as the head, to infer the ... and the full vector electromagnetic inverse source problems in the free space as well as in .... the so-called outgoing radiation boundary conditions, which are ...
COMPLEX WAVELET REGULARIZATION FOR SOLVING INVERSE PROBLEMS IN REMOTE SENSING
Weiss, Pierre
COMPLEX WAVELET REGULARIZATION FOR SOLVING INVERSE PROBLEMS IN REMOTE SENSING Mika¨el Carlavan Sophia-Antipolis - France ABSTRACT Many problems in remote sensing can be modeled as the min- imization processing: sparsity and regular- ity priors. 1. INTRODUCTION Some problems in remote sensing consist
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
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
Numerical Methods for the Inverse Nonlinear Fourier Transform
Civelli, Stella; Secondini, Marco
2015-01-01T23:59:59.000Z
We introduce a new numerical method for the computation of the inverse nonlinear Fourier transform and compare its computational complexity and accuracy to those of other methods available in the literature. For a given accuracy, the proposed method requires the lowest number of operations
Automatic Sacts and inverse semigroup presentations Erzsebet Rita Dombi
St Andrews, University of
Automatic SÂacts and inverse semigroup presentations Erzsâ??ebet Rita Dombi Ph.D. Thesis University.3 Automatic groups and semigroups . . . . . . . . . . . . . . . . . . . . . . . 14 3 Automatic semigroup acts.2 SchË?utzenberger automatic regular semigroups . . . . . . . . . . . . . . . . . 25 3.3 Examples
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.
Traveltime inversion of vertical radar profiles William P. Clement1
Barrash, Warren
, 1999 . The ac- quisition geometry of a VRP is similar to the better-known vertical seismic profile VSPTraveltime inversion of vertical radar profiles William P. Clement1 and Michael D. Knoll1 ABSTRACT Traveltimes of direct arrivals in vertical radar profiles VRPs are tomographically inverted to estimate
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
INVERSE MEDIUM SCATTERING PROBLEMS IN NEAR-FIELD ...
2007-05-08T23:59:59.000Z
verse medium scattering problem that arises in near-field optics, which .... Throughout, by assuming nonmagnetic materials and transverse electric polarization, ..... and J. Schotland, Determination of three-dimensional structure in photon scanning ... method for 3D electromagnetic imaging using adjoint fields, Inverse Probl., ...
Outer inverses: Jacobi type identities and nullities of submatrices
Bapat, Ravindra B.
Outer inverses: Jacobi type identities and nullities of submatrices@isid.ac.in Abstract According to the Jacobi identity, if A is an invertible matrix then any min* *or of A-1 for special generalized * *in- verses. A permanental analog of the Jacobi identity is proved. Bounds
Fast Vectorless Power Grid Verification Using an Approximate Inverse Technique
Najm, Farid N.
Fast Vectorless Power Grid Verification Using an Approximate Inverse Technique Nahi H. Abdul Ghani Department of ECE University of Toronto Toronto, Ontario, Canada f.najm@utoronto.ca ABSTRACT Power grid Aids General Terms Performance, Algorithms, Verification Keywords Power grid, voltage drop, approximate
A PLANAR PARALLEL MANIPULATOR WITH HOLONOMIC HIGHER PAIRS: INVERSE KINEMATICS
Hayes, John
kinematic analysis. Very little literature on such planar mechanisms was found. The e ects of initialA PLANAR PARALLEL MANIPULATOR WITH HOLONOMIC HIGHER PAIRS: INVERSE KINEMATICS Matthew John D. HAYES of Mechanical Engineering 817 r. Sherbrooke O., Rm 454, Montreal, Quebec, H3A 2K6 Canada, Tel: (514) 398
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.
An interactive Bayesian geostatistical inverse protocol for hydraulic tomography
Barrash, Warren
An interactive Bayesian geostatistical inverse protocol for hydraulic tomography Michael N. Fienen April 2008; published 25 July 2008. [1] Hydraulic tomography is a powerful technique for characterizing, necessitate subdivision into zones across which there is no correlation among hydraulic parameters. We propose
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
Current distribution in HTSC tapes obtained by inverse problem calculation
Amoros, Jaume
. There have been proposed several methods for non destructive in situ, or nearly in situ, testing of large on a non destructive measurement of the magnetic field created by the own current flowing in the SC. In this work, the QR inversion strategy is extended to non finite systems by considering the effect
Random variate generation for the generalized inverse gaussian distribution
Devroye, Luc
;Introduction The two-parameter form of the generalized inverse gaussian distribution (or gig) has density does not quite work for gig variate generation, but it is almost possible to do so. Indeed gaussian law--see, e.g., Lesosky and Horrocks (2003). -- 2 -- #12;A transformed gig distribution
State Complexity of Inversion Operations Da-Jung Cho1
Han, Yo-Sub
] investigated the state complexity for basic operations. Later, Yu and his co-authors [7, 8, 20, 21] initi- ated] investigated a generative mechanism based on some operations inspired by mutations in genomes such as deletionState Complexity of Inversion Operations Da-Jung Cho1 , Yo-Sub Han1 , Sang-Ki Ko1 , and Kai Salomaa
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).
The Inverse Kinetics Method and PID Compensation of the
spent working with me to understand the nuclear reactor theory. Additional thanks to Dr. Parma for all.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Nuclear Reaction TheoryThe Inverse Kinetics Method and PID Compensation of the Annular Core Research Reactor by Benjamin
Quadratic Inverse Eigenvalue Problems, Active Vibration Control and Model Updating
Datta, Biswa
is an important practical problem that arises in a wide range of applications, including mechanical vibrations control (AVC) and finite element model updating (FEMU) in mechanical vibration. The active vibrationQuadratic Inverse Eigenvalue Problems, Active Vibration Control and Model Updating Biswa N. Datta,1
Variational Structure of Inverse Problems in Wave Propagation and Vibration
Variational Structure of Inverse Problems in Wave Propagation and Vibration James G. Berryman in wave propagation (traveltime tomography) and two examples in vibration (the plucked string and free.'' For vibrating systems, the apparently very complex behavior of an excited string, drumhead, or the Earth can
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
Seismic amplitude inversion for interface geometry: practical approach for application
Pratt, R. Gerhard
-stack depth-migrated CRP gathers. The input data for tomography are time deviations derived from the apparent£ection seismic gathers is performed with the aid of pre-stack time migration, which enhances continuity and re zone by migration brings the amplitudes closer to the ray amplitudes assumed in the inversion. De-migration
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
Using Expert Knowledge in Solving the Seismic Inverse Problem
Ward, Karen
resources such as the oil in the Middle East. However, nowadays, most easy-to-access mineral resources have Inverse Problem: Brief Introduction In evaluations of natural resources and in the search for natural resources, it is very important to determine Earth structure. Our civilization greatly depends on the things
Using Expert Knowledge in Solving the Seismic Inverse Problem ?
Ward, Karen
resources such as the oil in the Middle East. However, nowadays, most easyÂtoÂaccess mineral resources have knowledge 1 Seismic Inverse Problem: Brief Introduction In evaluations of natural resources and in the search for natural resources, it is very important to determine Earth structure. Our civilization greatly
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
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
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
Kuhle, Nathan John
2001-01-01T23:59:59.000Z
, and distributed fracturing and folding. The relative contribution of these mechanisms depends on the relative ductility of the rock and magnitude of inversion. Reverse slip on the normal fault and distributed fracturing occur during early stages of inversion...
Fast Algorithms for Regularized Minimum Norm Solutions to Inverse Problems Irina F. Gorodnitsky
Gorodnitsky, Irina
Fast Algorithms for Regularized Minimum Norm Solutions to Inverse Problems Irina F. Gorodnitsky- tional algorithms for solving regularized inverse problems. The computationaladvantages are obtained. The algorithms imple- ment two common regularizationprocedures, Tikhonov reg- ularization and Truncated Singular
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...
Weighted Radon transforms for which the Chang approximate inversion formula is precise
Roman Novikov
2011-01-17T23:59:59.000Z
We describe all weighted Radon transforms on the plane for which the Chang approximate inversion formula is precise. Some subsequent results, including the Cormack type inversion for these transforms, are also given.
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
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...
Entropy production for a class of inverse SRB measures Eugen Mihailescu and Mariusz Urbanski
Urbanski, Mariusz
Entropy production for a class of inverse SRB measures Eugen Mihailescu and Mariusz Urba´nski Abstract We study the entropy production for inverse SRB measures for a class of hyperbolic folded strictly negative entropy production of the respective inverse SRB measures. Moreover we provide concrete
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
INVERSE KINEMATICS AND DYNAMICS ANALYSIS OF A THREE LEGGED PARALLEL MECHANISM ACTUATED BY AGVs
Saha, Subir Kumar
1 INVERSE KINEMATICS AND DYNAMICS ANALYSIS OF A THREE LEGGED PARALLEL MECHANISM ACTUATED BY AGVs kinematics and inverse dynamics analysis of a parallel mechanism is presented. The mechanism consists configuration. Inverse kinematics and dynamics analysis is also performed for the three actuators (mobile robots
Inversion of the noisy Radon transform on SO(3) by Gabor frames and sparse recovery principles
Teschke, Gerd
Inversion of the noisy Radon transform on SO(3) by Gabor frames and sparse recovery principles-dimensional Radon transform on the rotation group SO(3) is an ill-posed inverse problem that can be applied to X to stably approximate the inverse of the noisy Radon transform on SO(3). The proposed approach is composed
Migration/inversion for Incident Waves Synthesized from Common-Shot Data Gathers
Bleistein, Norman
Migration/inversion for Incident Waves Synthesized from Common-Shot Data Gathers Norman Bleistein Presented at the International Meeting of the SEG, 2006 Keywords Kirchhoff inversion, migration/inversion, true amplitude wave equation migration, Gaussian beams, ray theory, common-shot data, source synthesis
1.10 Theory and Observations Seismic Tomography and Inverse Methods
Boschi, Lapo
least-squares solutions 338 1.10.4.2.2 Occam's inversion and Bayesian methods 340 1.10.4.3 Hypocenter solvers 338 1.10.4.2 Regularized and Constrained Inversion 338 1.10.4.2.1 Generalized inverse and damped
Author's personal copy Monte Carlo methods for design and analysis of radiation detectors
Shultis, J. Kenneth
Author's personal copy Monte Carlo methods for design and analysis of radiation detectors William L Radiation detectors Inverse problems Detector design a b s t r a c t An overview of Monte Carlo as a practical method for designing and analyzing radiation detectors is provided. The emphasis is on detectors
Linninger, Andreas A.
-integrated prefractionating columns. Our employed inverse design procedure enables the systematic design of physically process design with ecological or energy targets.1,2 Distillation is arguably the most significant suggested.412 For example, thermally coupled distillation columns known as Petlyuk configurations13 only
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.
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).
Advances in Inverse Transport Methods and Applications to Neutron Tomography
Wu, Zeyun
2011-02-22T23:59:59.000Z
) tomography method [5?7], which mainly involves the following principles: (1) Radon transform and inverse Radon transform, which maps and anti-maps a transmission line set to a projected point set; (2) Fourier projection-slice theorem (also referred... of the Radon Transform [5,6,59], e.g., line integrals along projection trajectories. With some in- version techniques such as filtered back projection (FBP) applied to the projections, analytic tomography methods are capable of reconstructing material...
Level-set, penalization and cartesian meshes: A paradigm for inverse problems and optimal design
Bruneau, Charles-Henri
of their engines, are required to look for aerodynamic ways to re- duce oil consumption, particularly through Bordeaux, IMB and INRIA Futurs, MC2, CNRS UMR 5251, 351 Cours de la Libération, Talence F-33405, France b Université du Sud Toulon Var, Imath, Avenue de l'Université, BP20132 La Garde Cedex F-83957, France a r t i c
Inverse Problem Techniques for the Design of Photonic Crystals Martin Burger
Soatto, Stefano
as for optical wavelengths. These new structures are inspired by the 3-D geome- try of both natural crystals, Quan- tum Optics, Nano-structures, Materials Science, and now Applied Mathematics. Essentially this field has concerned itself with arti- ficial engineering of 3-D structures that achieve a cer- tain goal
Inverse Problems, Design and Optimization Symposium (IPDO-2013) Albi, France, June 26-28, 2013
Paris-Sud XI, Université de
and flexible strategies are needed to increase the use of biomass in Europe [4]. Thermal energy storage by 2020, the European Union counts on biomass to impact on final heat energy consumption. Using biomass of biomass affirmed that biomass for heating and power applications can reduce such emissions by 55 to 98
Center for Inverse Design Highlight: Anomalous Surface Conductivity in In2O3 Transparent Conductors
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt DocumentationSitesWeather6 Shares of U.S.Career Opportunities forLight EmittingLED Nanowire
Center for Inverse Design Highlight: Enabling Practical p-Type Doping in Oxide Spinels
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt DocumentationSitesWeather6 Shares of U.S.Career Opportunities forLight EmittingLED NanowirePractical
Inverse Design of High-Absorption Thin-Film Photovoltaic Materials
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirtA Journey Inside the Complex and Powerful World'Make' Introduction to 'Make'SeeInventors in
Inverse Design of Mn-based ternary p-type wide-gap oxides
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirtA Journey Inside the Complex and Powerful World'Make' Introduction to 'Make'SeeInventors inZnO is an
Inverse Design of Mn-based ternary p-type wide-gap oxides
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirtA Journey Inside the Complex and Powerful World'Make' Introduction to 'Make'SeeInventors inZnO is
An Asymptotic Numerical Method for Inverse Elastic Shape Design Changxi Zheng
Grinspun, Eitan
]: Computational Geom- etry and Object Modeling--Physically based modeling; Keywords: elastic fabrication, 3D printing, finite element methods, nonlinear optimization Links: DL PDF VIDEO CODE 1 Introduction Elastic
Inverse Problems, Design and Optimization Symposium (IPDO-2013) Albi, France, June 26-28, 2013
Paris-Sud XI, Université de
is a two-point shape optimization of a helicopter rotor blade in which the primary criterion is the Figure. This approach is first demonstrated over a test-case of aero-structural aircraft wing shape opti- mization
Partial Inverse Compensation Techniques for Linear Control Design in Magnetostrictive Transducers
are typically biased through either an applied DC current to the solenoid or by way of a permanent magnet and forces generated by magnetostrictive transducers with reasonable accuracy. However, at the moderate and automotive processes due to the magnitude of forces and strains which can be generated through currents
Experimental Design and Inverse Problems in Plant Biological , H.T. Banks
growth. 1 Introduction and Motivation In today's world, the demand for more food and energy) using non-linear enzyme kinetic ordinary dif- ferential equations and mass-balance laws that contain, diets are changing, and our need for more energy as fuel is rising; however, we do not have the land
Experience of light : the use of an inverse method and a genetic algorithm in daylight design
Chutarat, Acharawan
2001-01-01T23:59:59.000Z
Integration of daylight availability in time and architectural space is a critical element in achieving optimal comfort and productivity, as well as in minimizing energy consumption. In recent years, there has been an ...
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,
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.
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.
Inverse determination of effective mechanical properties of adhesive bondlines
Hass, Philipp; Mendoza, Miller; Herrmann, Hans J; Niemz, Peter
2015-01-01T23:59:59.000Z
A new approach for determining effective mechanical bondline properties using a combined experimental-numerical modal analysis technique is proposed. After characterizing clear spruce wood boards, an adhesive layer is applied to the boards surfaces. The shift of the eigenfrequencies resulting from the adhesive layer together with information on the bondline geometry can then be used to inversely determine the mechanical properties of the adhesive layer using Finite Element Models. The calculated values for clear wood as well as for the adhesive layer lie within reasonable ranges, thus demonstrating the methods potential.
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.
Quark Antiscreening at Strong Magnetic Field and Inverse Magnetic Catalysis
E. J. Ferrer; V. de la Incera; X. J. Wen
2015-02-17T23:59:59.000Z
The dependence of the QCD coupling constant with a strong magnetic field and the implications for the critical temperature of the chiral phase transition are investigated. It is found that the coupling constant becomes anisotropic in a strong magnetic field and that the quarks, confined by the field to the lowest Landau level where they pair with antiquarks, produce an antiscreening effect. These results lead to inverse magnetic catalysis, providing a natural explanation for the behavior of the critical temperature in the strong-field region.
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.
Inversion formulas for the broken-ray Radon transform
Lucia Florescu; Vadim A. Markel; John C. Schotland
2010-07-23T23:59:59.000Z
We consider the inverse problem of the broken ray transform (sometimes also referred to as the V-line transform). Explicit image reconstruction formulas are derived and tested numerically. The obtained formulas are generalizations of the filtered backprojection formula of the conventional Radon transform. The advantages of the broken ray transform include the possibility to reconstruct the absorption and the scattering coefficients of the medium simultaneously and the possibility to utilize scattered radiation which, in the case of the conventional X-ray tomography, is typically discarded.
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.
Improving Collision Induced Dissociation (CID), High Energy Collision...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In this work we describe how peptide high-precision fragments measured with Fourier transform mass spectrometry can provide a powerful discriminative capability to...
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~1 Preparation of Esters \\leth) I e\\ler lIere preparuJ u\\lng the mClhod :r, "ere \\cparated an d Idenlilied u\\lng , Zook E J Powell B Hackley J Emerson J Brooker. and G M Knobl
Modified Inverse First Order Reliability Method (I-FORM) for Predicting Extreme Sea States.
Eckert-Gallup, Aubrey Celia; Sallaberry, Cedric Jean-Marie; Dallman, Ann Renee; Neary, Vincent Sinclair
2014-09-01T23:59:59.000Z
Environmental contours describing extreme sea states are generated as the input for numerical or physical model simulation s as a part of the stand ard current practice for designing marine structure s to survive extreme sea states. Such environmental contours are characterized by combinations of significant wave height ( ) and energy period ( ) values calculated for a given recurrence interval using a set of data based on hindcast simulations or buoy observations over a sufficient period of record. The use of the inverse first - order reliability method (IFORM) i s standard design practice for generating environmental contours. In this paper, the traditional appli cation of the IFORM to generating environmental contours representing extreme sea states is described in detail and its merits and drawbacks are assessed. The application of additional methods for analyzing sea state data including the use of principal component analysis (PCA) to create an uncorrelated representation of the data under consideration is proposed. A reexamination of the components of the IFORM application to the problem at hand including the use of new distribution fitting techniques are shown to contribute to the development of more accurate a nd reasonable representations of extreme sea states for use in survivability analysis for marine struc tures. Keywords: In verse FORM, Principal Component Analysis , Environmental Contours, Extreme Sea State Characteri zation, Wave Energy Converters
Inversion of seismic reflection traveltimes using a nonlinear optimization scheme
Pullammanappallil, S.K.; Louie, J.N. (Univ. of Nevada, Reno, NV (United States). Mackay School of Mines)
1993-11-01T23:59:59.000Z
The authors present the use of a nonlinear optimization scheme called generalized simulated annealing to invert seismic reflection times for velocities, reflector depths, and lengths. A finite-difference solution of the eikonal equation computes reflection traveltimes through the velocity model and avoids ray tracing. They test the optimization scheme on synthetic models and compare it with results from a linearized inversion. The synthetic tests illustrate that, unlike linear inversion schemes, the results obtained by the optimization scheme are independent of the initial model. The annealing method has the ability to produce a suite of models that satisfy the data equally well. They make use of this property to determine the uncertainties associated with the model parameters obtained. Synthetic examples demonstrate that allowing the reflector length to vary, along with its position, helps the optimization process obtain a better solution. The authors put this to use in imaging the Garlock fault, whose geometry at depth is poorly known. They use reflection times picked from shot gathers recorded along COCORP Mojave Line 5 to invert for the Garlock fault and velocities within the Cantil Basin below Fremont Valley, California. The velocities within the basin obtained by their optimization scheme are consistent with earlier studies, though their results suggest that the basin might extend 1--2 km further south. The reconstructed reflector seems to suggest shallowing of the dip of the Garlock fault at depth.
Balancing aggregation and smoothing errors in inverse models
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Turner, A. J.; Jacob, D. J.
2015-01-13T23:59:59.000Z
Inverse models use observations of a system (observation vector) to quantify the variables driving that system (state vector) by statistical optimization. When the observation vector is large, such as with satellite data, selecting a suitable dimension for the state vector is a challenge. A state vector that is too large cannot be effectively constrained by the observations, leading to smoothing error. However, reducing the dimension of the state vector leads to aggregation error as prior relationships between state vector elements are imposed rather than optimized. Here we present a method for quantifying aggregation and smoothing errors as a function ofmore »state vector dimension, so that a suitable dimension can be selected by minimizing the combined error. Reducing the state vector within the aggregation error constraints can have the added advantage of enabling analytical solution to the inverse problem with full error characterization. We compare three methods for reducing the dimension of the state vector from its native resolution: (1) merging adjacent elements (grid coarsening), (2) clustering with principal component analysis (PCA), and (3) applying a Gaussian mixture model (GMM) with Gaussian pdfs as state vector elements on which the native-resolution state vector elements are projected using radial basis functions (RBFs). The GMM method leads to somewhat lower aggregation error than the other methods, but more importantly it retains resolution of major local features in the state vector while smoothing weak and broad features.« less
Balancing aggregation and smoothing errors in inverse models
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Turner, A. J.; Jacob, D. J.
2015-06-30T23:59:59.000Z
Inverse models use observations of a system (observation vector) to quantify the variables driving that system (state vector) by statistical optimization. When the observation vector is large, such as with satellite data, selecting a suitable dimension for the state vector is a challenge. A state vector that is too large cannot be effectively constrained by the observations, leading to smoothing error. However, reducing the dimension of the state vector leads to aggregation error as prior relationships between state vector elements are imposed rather than optimized. Here we present a method for quantifying aggregation and smoothing errors as a function ofmore »state vector dimension, so that a suitable dimension can be selected by minimizing the combined error. Reducing the state vector within the aggregation error constraints can have the added advantage of enabling analytical solution to the inverse problem with full error characterization. We compare three methods for reducing the dimension of the state vector from its native resolution: (1) merging adjacent elements (grid coarsening), (2) clustering with principal component analysis (PCA), and (3) applying a Gaussian mixture model (GMM) with Gaussian pdfs as state vector elements on which the native-resolution state vector elements are projected using radial basis functions (RBFs). The GMM method leads to somewhat lower aggregation error than the other methods, but more importantly it retains resolution of major local features in the state vector while smoothing weak and broad features.« less
Estimation of Impedance Using Seismic Reflection Data Based on Transdimensional Inversion
Dadi, Sireesh
2014-04-23T23:59:59.000Z
parameters based on an ensemble of models. I apply Bayesian inversion with rjMCMC sampling for two applications. In the first application, I define upscaling velocity logs as an inversion problem to obtain optimal models and quantify uncertainty of upscaled... for a cost function, global optimization techniques are necessary to characterize the global minimum solution. Stochastic, model-based seismic inversion is a widely used global optimization technique and Markov Chain Monte Carlo (MCMC) method is a...
Smith, Cherri Imelda
1987-01-01T23:59:59.000Z
of dynamic control systems. It allows direct, parametric observation of parameter deviations. In this aspect, inverse sensitivity theory is a powerful device in preventing the gradual deterioration of system performance. Normally large changes in system... systems. Another set of first-order inverse sensitivity functions were developed for the nonlinear-in-parameter systems. A method was offered for obtaining higher-order inverse sensitivity functions for nonlinear-in-parameter systems. The derived...
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.
Hinnell, A.C.
2010-01-01T23:59:59.000Z
followed by a case study considering infiltration into astudy, we demonstrate the advantages and limitations of coupled hydrogeophysical inversion using an illustrative example of infiltration
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 ...
Dornfeld, David; Wright, Paul
2007-01-01T23:59:59.000Z
Environmentally benign manufacturing: Trends in Europe,USA” Trans. ASME, J. Manufacturing Science and Engineering,Design and Inverse Manufacturing, Tokyo, Japan. Krishnan,
Identifying Isotropic Events Using a Regional Moment Tensor Inversion
Dreger, D S; Ford, S R; Walter, W R
2009-08-03T23:59:59.000Z
In our previous work the deviatoric and isotropic source components for 17 explosions at the Nevada Test Site, as well as 12 earthquakes and 4 collapses in the surrounding region of the western US, were calculated using a regional time-domain full waveform inversion for the complete moment tensor (Dreger et al., 2008; Ford et al., 2008; Ford et al., 2009a). 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 developed a new Network Sensitivity Solution (NSS) in which the fit of sources distributed over a source-type plot (Hudson et al., 1989) show the resolution of the source parameters. The NSS takes into account the unique station distribution, frequency band, and signal-to-noise ratio of a given event scenario. The NSS compares both a hypothetical pure source (for example an explosion or an earthquake) and the actual data with several thousand sets of synthetic data from a uniform distribution of all possible sources. The comparison with a hypothetical pure source provides the theoretically best-constrained source-type region for a given set of stations, and with it one can determine whether further analysis with the data is warranted. We apply the NSS to a NTS nuclear explosion, and earthquake, as well as the 2006 North Korean explosion, and a nearby earthquake. The results show that explosions and earthquakes are distinguishable, however the solution space depends strongly on the station coverage. Finally, on May 25, 2009 a second North Korean test took place. Our preliminary results show that the explosive nature of the event may be determined using the regional distance moment tensor method. Results indicate that the 2009 event is approximately 5-6 times larger than the earlier test, with an isotropic moment of about 1.8e+22 dyne cm. We perform a series of inversions for pure double-couple, pure explosion, combined double-couple and explosion, full moment tensor, and damped moment tensor inversions to assess the resolution of the isotropic moment of the event.
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.
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.
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.
Inverse magnetic catalysis in holographic models of QCD
Kiminad A. Mamo
2015-05-11T23:59:59.000Z
We study the effect of magnetic field $B$ on the critical temperature $T_{c}$ of the confinement-deconfinement phase transition in hard-wall AdS/QCD, and holographic duals of flavored and unflavored $\\mathcal{N}=4$ super-Yang Mills theories on $\\mathbb{R}^3\\times \\rm S^1$. For all of the holographic models, we find that $T_{c}(B)$ decreases with increasing magnetic field $B\\ll T^2$, consistent with the inverse magnetic catalysis recently observed in lattice QCD for $B\\lesssim 1~GeV^2$. We also predict that, for large magnetic field $B\\gg T^2$, the critical temperature $T_{c}(B)$, eventually, starts to increase with increasing magnetic field $B\\gg T^2$ and asymptotes to a constant value.
A Model for TSUnami FLow INversion from Deposits (TSUFLIND)
Tang, Hui
2015-01-01T23:59:59.000Z
Modern tsunami deposits are employed to estimate the overland flow characteristics of tsunamis. With the help of the overland-flow characteristics, the characteristics of the causative tsunami wave can be estimated. The understanding of tsunami deposits has tremendously improved over the last decades. There are three prominent inversion models: Moore advection model, Soulsby's model and TsuSedMod model. TSUFLIND incorporates all three models and adds new modules to better simulate tsunami deposit formation and calculate flow condition. TSUFLIND takes grain-size distribution, thickness, water depth and topography information as inputs. TSUFLIND computes sediment concentration, grain-size distribution of sediment source and initial flow condition to match the sediment thickness and grain size distribution from field observation. Furthermore, TSUFLIND estimates the flow speed, Froude number and representative wave amplitude. The model is tested by using field data collected at Ranganathapuram, India after the 20...
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.
The Dynamical Inverse Problem for Axisymmetric Stellar Systems
David Merritt
1996-06-05T23:59:59.000Z
The standard method of modelling axisymmetric stellar systems begins from the assumption that mass follows light. The gravitational potential is then derived from the luminosity distribution, and a unique two-integral distribution function f(E,Lz) that generates the stellar density in this potential is found. We show that the gravitational potential can instead be generated directly from the velocity data in a two-integral galaxy, thus allowing one to drop the assumption that mass follows light. The rotational velocity field can also be recovered in a model-independent way. We present regularized algorithms for carrying out the inversions and test them by application to pseudo-data from a family of oblate models.
Stokes Inversion Techniques: Recent Advances and New Challenges
L. R. Bellot Rubio
2006-09-27T23:59:59.000Z
Inversion techniques (ITs) allow us to infer the magnetic, dynamic, and thermal properties of the solar atmosphere from polarization line profiles. In recent years, major progress has come from the application of ITs to state-of-the-art observations. This paper summarizes the main results achieved both in the photosphere and in the chromosphere. It also discusses the challenges facing ITs in the near future. Understanding the limitations of spectral lines, implementing more complex atmospheric models, and devising efficient strategies of data analysis for upcoming ground-based and space-borne instruments, are among the most important issues that need to be addressed. It is argued that proper interpretations of diffraction-limited Stokes profiles will not be possible without accounting for gradients of the atmospheric parameters along the line of sight. The feasibility of determining gradients in real time from space-borne observations is examined.
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.
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.
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
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.
Geophysical inversion with adaptive array processing of ambient noise
Traer, James
2011-01-01T23:59:59.000Z
a new air–sea interaction spar buoy: Design and performanceMiami Air-Sea Interaction Spar (ASIS) Buoys [11] generated
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
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
Meju, Max
Joint two-dimensional DC resistivity and seismic travel time inversion with cross to evaluate the structural features common to both methods. The cross-gradients function is incorporated method. The resultant iterative two-dimensional (2-D) joint inversion scheme is successfully applied
New constraints on the upper mantle structure of the Slave craton from Rayleigh wave inversion
Rondenay, Stephane
New constraints on the upper mantle structure of the Slave craton from Rayleigh wave inversion Chin recorded by the POLARIS broadband seismic network and the Yellowknife array. Phase velocities obtained of its high degree of mantle depletion. The one-dimensional inversion of phase velocities yields high
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
Joint inversion of seismic traveltimes and gravity data on unstructured grids with application to
Farquharson, Colin G.
Joint inversion of seismic traveltimes and gravity data on unstructured grids with application to mineral exploration Peter G. Leli`evre, Colin G. Farquharson and Charles A. Hurich plelievre Seismic data (2 / 32) Leli`evre, Farquharson, Hurich, plelievre@mun.ca Joint inversion of seismic
Brachytherapy Anatomy-based inverse planning dose optimization in HDR prostate
Pouliot, Jean
Brachytherapy Anatomy-based inverse planning dose optimization in HDR prostate implant: A toxicity-planned HDR brachytherapy is a viable option to deliver higher dose to the prostate as a boost without; HDR brachytherapy; Inverse planning; Simulated annealing; Toxicity Worldwide, more than 650,000 men
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
Lightweight Floating-Point Arithmetic: Case Study of Inverse Discrete Cosine Transform
Chen, Tsuhan
, customizable bit- width, rounding modes, low-power, inverse discrete cosine transform, video coding 1 of effort must be spent to manage the complexity, power consumption and time-to-market of the modernLightweight Floating-Point Arithmetic: Case Study of Inverse Discrete Cosine Transform Fang Fang
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
GG695 BAYESIAN DATA ANALYSIS [3 CR] (former title: Geophysical Inverse Theory)
Estimation and Inverse Problems, 2nd edition, Academic Press. Tarantola, A. (2005) Inverse Problem Theory, Oxford University Press. Gelman et al. (2014) Bayesian Data Analysis, 3rd edition, Chapman and Hall objectives, respectively, for the MS and PhD graduate degree programs, relating to technical knowledge
A joint atmosphere-ocean inversion for surface fluxes of carbon dioxide
Fletcher, Sara E. Mikaloff
A joint atmosphere-ocean inversion for surface fluxes of carbon dioxide: 2. Regional results Andrew atmospheric CO2 gradients and transport simulations are combined with observations of ocean interior carbon (2007), A joint atmosphere-ocean inversion for surface fluxes of carbon dioxide: 2. Regional results
A joint atmosphere-ocean inversion for surface fluxes of carbon dioxide
Fletcher, Sara E. Mikaloff
interprets in situ observations of carbon dioxide concentration in the ocean and atmosphere with transportA joint atmosphere-ocean inversion for surface fluxes of carbon dioxide: 1. Methods and global March 2007. [1] We have constructed an inverse estimate of surface fluxes of carbon dioxide using both
Using CO2:CO correlations to improve inverse analyses of carbon fluxes
Palmer, Paul
Using CO2:CO correlations to improve inverse analyses of carbon fluxes Paul I. Palmer,1,2 Parvadha 30 June 2006. [1] Observed correlations between atmospheric concentrations of CO2 and CO represent potentially powerful information for improving CO2 surface flux estimates through coupled CO2-CO inverse
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
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
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
INVERSIONS OF INTEGRAL OPERATORS AND ELLIPTIC BETA INTEGRALS ON ROOT SYSTEMS
Warnaar, Ole
INVERSIONS OF INTEGRAL OPERATORS AND ELLIPTIC BETA INTEGRALS ON ROOT SYSTEMS VYACHESLAV P- metric integrals associated to a pair of root systems. Using the (A,C) inversion formula to invert one of the known C-type elliptic beta integrals, we obtain a new elliptic beta integral for the root system of type
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
Circular Harmonic Decomposition Approach for Numerical Inversion of Circular Radon Transforms
Louis, Alfred K.
Circular Harmonic Decomposition Approach for Numerical Inversion of Circular Radon Transforms Gaël@num.uni-sb.de ABSTRACT Numerical inversions via circular harmonic decomposition for two classes of circular Radon transforms are established. The first class deals with the Radon transform (RT) de- fined on circular arcs
EXPONENTIAL RADON TRANSFORM INVERSION BASED ON HARMONIC ANALYSIS OF THE EUCLIDEAN MOTION GROUP
Yazici, Birsen
EXPONENTIAL RADON TRANSFORM INVERSION BASED ON HARMONIC ANALYSIS OF THE EUCLIDEAN MOTION GROUP Can Engineering Troy, NY ABSTRACT This paper presents a new method for the exponential Radon trans- form inversion based on harmonic analysis of the Euclidean mo- tion group (M(2)). The exponential Radon transform
RADON TRANSFORM INVERSION BASED ON HARMONIC ANALYSIS OF THE EUCLIDEAN MOTION GROUP
Yazici, Birsen
RADON TRANSFORM INVERSION BASED ON HARMONIC ANALYSIS OF THE EUCLIDEAN MOTION GROUP Can Evren Yarman of the projection slice theorem using harmonic analysis of the Euclidean motion group (M(N)). The Radon transform to new algo- rithms for the inversion of the Radon transform. 1. INTRODUCTION The Radon transform forms
On the number of roots of self-inversive polynomials on the complex unit circle
R. S. Vieira
2015-02-18T23:59:59.000Z
We present sufficient conditions for a self-inversive polynomial to have a fixed number of roots on the complex unit circle. This generalizes the condition found by Lakatos and Losonczi for a self-inversive polynomial to have all its roots on the complex unit circle.
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
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
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
Boschetti, Fabio
Algorithms F. Boschetti L. Moresi CSIRO, Exploration and Mining, CSIRO, Exploration and Mining, 39 Fairway@ned.dem.csiro.au Abstract- Inversion algorithms employ numerical evaluation of the mismatch between model and data to guide for physical reasons. Since such a priori assumptions are often hidden deep in the inverse algorithm
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.
Acceleration of electrons using an inverse free electron laser auto- accelerator
Wernick, I.K.; Marshall, T.C.
1992-07-01T23:59:59.000Z
We present data from our study of a device known as the inverse free electron laser. First, numerical simulations were performed to optimize the design parameters for an experiment that accelerates electrons in the presence of an undulator by stimulated absorption of radiation. The Columbia free electron laser (FEL) was configured as an auto-accelerator (IFELA) system; high power (MW`s) FEL radiation at {approximately}1.65 mm is developed along the first section of an undulator inside a quasi-optical resonator. The electron beam then traverses a second section of undulator where a fraction of the electrons is accelerated by stimulated absorption of the 1.65 mm wavelength power developed in the first undulator section. The second undulator section has very low gain and does not generate power on its own. We have found that as much as 60% of the power generated in the first section can be absorbed in the second section, providing that the initial electron energy is chosen correctly with respect to the parameters chosen for the first and second undulators. An electron momentum spectrometer is used to monitor the distribution of electron energies as the electrons exit the IFELA. We have found; using our experimental parameters, that roughly 10% of the electrons are accelerated to energies as high as 1100 keV, in accordance with predictions from the numerical model. The appearance of high energy electrons is correlated with the abrupt absorption of millimeter power. The autoaccelerator configuration is used because there is no intense source of coherent power at the 1.65 mm design wavelength other than the FEL.
Acceleration of electrons using an inverse free electron laser auto- accelerator
Wernick, I.K.; Marshall, T.C.
1992-07-01T23:59:59.000Z
We present data from our study of a device known as the inverse free electron laser. First, numerical simulations were performed to optimize the design parameters for an experiment that accelerates electrons in the presence of an undulator by stimulated absorption of radiation. The Columbia free electron laser (FEL) was configured as an auto-accelerator (IFELA) system; high power (MW's) FEL radiation at {approximately}1.65 mm is developed along the first section of an undulator inside a quasi-optical resonator. The electron beam then traverses a second section of undulator where a fraction of the electrons is accelerated by stimulated absorption of the 1.65 mm wavelength power developed in the first undulator section. The second undulator section has very low gain and does not generate power on its own. We have found that as much as 60% of the power generated in the first section can be absorbed in the second section, providing that the initial electron energy is chosen correctly with respect to the parameters chosen for the first and second undulators. An electron momentum spectrometer is used to monitor the distribution of electron energies as the electrons exit the IFELA. We have found; using our experimental parameters, that roughly 10% of the electrons are accelerated to energies as high as 1100 keV, in accordance with predictions from the numerical model. The appearance of high energy electrons is correlated with the abrupt absorption of millimeter power. The autoaccelerator configuration is used because there is no intense source of coherent power at the 1.65 mm design wavelength other than the FEL.
Geophysical inversion using petrophysical constraints with application to lithology differentiation. It has been shown that incorporation of such information into geophysical inversions can greatly improve region, the application of petrophysical constraints to geophysical inversions could seriously distort
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 $\\omega^{-4}$.
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.
van Vliet, Lucas J.
-wavelength scale. The presented thin-bed seismic inversion method, which makes use of a priori information obtained of Technology) SUMMARY The analysis of seismic data is always an inversion problem since the quantities from a well, is quite sufficient for very thin reservoirs. The resolution of the thin-bed inversion
van Vliet, Lucas J.
High-resolution reservoir characterization by an acoustic impedance inversion of a Tertiary deltaic of both methods with the actual seismic data. INTRODUCTION Inversion of seismic data is a widely used tool seismic inversion methods based on the form of the objective function to be minimized. Merletti and Torres
Sailhac, Pascal
Inversion of surface nuclear magnetic resonance data by an adapted Monte Carlo method applied, France Abstract Inversion of surface nuclear magnetic resonance (SNMR) provides important information Science B.V. All rights reserved. Keywords: Inversion; Surface nuclear magnetic resonance; Monte Carlo 1
Analytic continuation of Pasquier inversion representation of Khuri-Treiman equation
Peng Guo
2014-12-12T23:59:59.000Z
The single integral form of Pasquier inversion representation of Khuri-Treiman (KT) equation presents great advantages for describing final state interaction of three-body decay or production processes. However, the original form of Pasquier inversion representation is only given in decay region and regions below. For the regions above, analytic continuation of original form is required. Because of non-trivial nature of analytic continuation procedure, it is the purpose of this work to obtain a well-defined Pasquier inversion representation of KT equation for all the energy range.
Algorithmic design of self-assembling structures
Henry Cohn; Abhinav Kumar
2009-06-18T23:59:59.000Z
We study inverse statistical mechanics: how can one design a potential function so as to produce a specified ground state? In this paper, we show that unexpectedly simple potential functions suffice for certain symmetrical configurations, and we apply techniques from coding and information theory to provide mathematical proof that the ground state has been achieved. These potential functions are required to be decreasing and convex, which rules out the use of potential wells. Furthermore, we give an algorithm for constructing a potential function with a desired ground state.
Design Editorial Design Analysis and Synthesis
Papalambros, Panos
Journal of Mechanical Design Editorial Design Analysis and Synthesis What is design? Why is design to call it simply design analysis. If a design exists, I can analyze its behavior. Based on the results of the analysis, I may have to modify the design to make it fit better to my purpose. The implication of analysis
Network Sensitivity Solutions for Regional Moment Tensor Inversions
Ford, S R; Dreger, D S; Walter, W R
2009-06-05T23:59:59.000Z
Well-resolved moment tensor solutions reveal information about the sources of seismic waves. Here we introduce a new way of assessing confidence in the regional full moment tensor inversion via the introduction of the network sensitivity solution (NSS). The NSS takes into account the unique station distribution, frequency band, and signal-to-noise ratio of a given event scenario. The NSS compares both a hypothetical pure source (for example an explosion or an earthquake) and the actual data with several thousand sets of synthetic data from a uniform distribution of all possible sources. The comparison with a hypothetical pure source provides the theoretically best-constrained source-type region for a given set of stations, and with it one can determine whether further analysis with the data is warranted. The NSS that employs the actual data gives a direct comparison of all other source-types with the best-fit source. In this way, one can choose a threshold level of fit where the solution is comfortably constrained. The method is tested for the well-recorded nuclear test, JUNCTION, at the Nevada Test Site. Sources that fit comparably well to a hypothetical pure explosion recorded with no noise at the JUNCTION data stations have a large volumetric component and are not described well by a double-couple (DC) source. The NSS using the real data from JUNCTION is even more tightly constrained to an explosion since the data contains some energy that precludes fitting with any type of deviatoric source. We also calculate the NSS for the October 2006 North Korea test and a nearby earthquake, where the station coverage is poor and the event magnitude is small. The earthquake solution is very well fit by a DC source, and the best-fit solution to the nuclear test (M{sub W}4.1) is dominantly explosion.
Manuel, Lance
On Assessing the Accuracy of Offshore Wind Turbine Reliability-Based Design Loads from to derive design loads for an active stall-regulated offshore wind turbine. Two different Danish offshore contour method; wind turbine; offshore; reliability. INTRODUCTION Inverse reliability techniques
Bangerth, Wolfgang
INVERSE BIOMEDICAL IMAGING USING SEPARATELY ADAPTED MESHES FOR PARAMETERS AND FORWARD MODEL Many important existing and upcoming biomedical imaging modalities lead to nonlinear relationships experiment. 1. INTRODUCTION In a number of current and upcoming biomedical imaging methods, the relationship
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
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 ...
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...
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
Near E{sub F} Electronic Structure of Graphite from Photoemission and Inverse Photoemission Studies
Sekhar, B. R.; Kundu, R.; Mishra, P. [Institute of Physics, Sachivalaya Marg, Bhubaneswar 751005 (India); Maniraj, M.; Barman, S. R. [Surface Physics Laboratory, UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452001, Madhya Pradesh (India)
2011-10-20T23:59:59.000Z
A comparative study of the electronic band structure of single crystal and highly oriented pyrolitic graphite is presented. We have used angle resolved photoelectron spectroscopy and angle resolved inverse photoelectron spectroscopy to map the occupied and unoccupied electronic states respectively.
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 ...
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 ...
2D Joint Inversion Of Dc And Scalar Audio-Magnetotelluric Data...
situated in a graben. The joint inverted models show a better definition of shallow and deep structures. The results show that the extension of the benefits using joint inversion...
Property estimation using inverse methods for elliptic and parabolic partial differential equations
Parmekar, Sandeep
1994-01-01T23:59:59.000Z
In this work we use inverse methods to estimate flow coefficients in both elliptic and parabolic partial differential equations. An algorithm is developed to solve a one layer problem for elliptic and parabolic partial differential equations...
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.
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...
Phillips, Mike Randall
1993-01-01T23:59:59.000Z
Parallel computing is applied to the solution of an inverse problem arising from a system of hyperbolic partial differential equations. A sequential algorithm is converted to a parallel algorithm, and it is executed on a ...
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 ...
Watanabe, Shingo
2013-08-26T23:59:59.000Z
Automatic history matching methods utilize various kinds of inverse modeling techniques. In this dissertation, we examine ensemble Kalman filter as a stochastic approach for assimilating different types of production data and streamline...
wavelet domain inversion and joint deconvolution/interpolation of geophysical data
Kane, Jonathan A. (Jonathan Andrew), 1973-
2003-01-01T23:59:59.000Z
This thesis presents two innovations to geophysical inversion. The first provides a framework and an algorithm for combining linear deconvolution methods with geostatistical interpolation techniques. This allows for sparsely ...
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 ...
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...
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.
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...
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.
Menke, William
trivially. 4. The damped least squares generalized inverse has the form Note that since is symmetric, its least squares generalized inverse % GMG = (G'*G + epsi*eye(M,M)) \\ G' epsi = 0.1; A = (G'*G + epsi data kernel s=0.1; G=random('Normal',0, s, N, M ) + eye(N,M); % stddev of data sigmad = 1; % use damped
Bruce A. Bassett; David Parkinson; Robert C. Nichol
2005-07-05T23:59:59.000Z
We highlight the flexibility of the IPSO experiment-design framework by contrasting its application to CMB, weak lensing and redshift surveys. We illustrate the latter with a 10 parameter MCMC D-optimisation of a dark energy redshift survey. When averaged over a standard dark energy model space the resulting optimal survey typically has only one or two redshift bins, located at zoptimisation we show how the statistical power of such surveys is significantly enhanced. Experiment design is aided by the richness of the figure of merit landscape which means one can impose secondary optimisation criteria at little cost. For example, one may choose either to maximally test a single model (such as \\Lambda CDM) or to get the most general model-independent constraints possible (e.g. on a whole space of dark energy models). Such freedom points to a future where cosmological experiments become increasingly specialised and optimisation increasingly important.
Embedded Design Guide Embedded Design Guide
Berns, Hans-Gerd
Embedded Design Guide #12;Embedded Design Guide Table of Contents Embedded Systems Overview . . . . . . . . . . . . . . . .4 Elements of Embedded Designs . . . . . . . . . . . . . . . . . . .5 Key Test Challenges of Embedded Designs . . . . . . . . . .6 Microprocessors and Microcontrollers . . . . . . . . 7 - 11 Debugging
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.
Simulation studies of the three-phase inverse dual converter
Arvind, Jayanthi
1991-01-01T23:59:59.000Z
Ehsani and Kustom and are presented in their book [7]. The IDC circuit proposed by Ehsani et al [6] also uses thyristors in a multi-stage configuration in order to enhance power handling capability The single-phase IDC was designed and analyzed using... frequencies. A proof-of-principle circuit was also built to illustrate the operation of a single-phase IDC experimentally [6]. The basic circuit diagram of the single phase IDC is shown in Fig. 1, where, V? is the input source voltage, Ls is the source...
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.
Constraints on the structure of 16 Cyg A and 16 Cyg B using inversion techniques
Buldgen, G; Dupret, M A
2015-01-01T23:59:59.000Z
Constraining mixing processes and chemical composition is a central problem in stellar physics as their impact on stellar age determinations leads to biases in our studies of stellar evolution, galactic history and exoplanetary systems. In two previous papers, we showed how seismic inversion techniques could offer strong constraints on such processes by pointing out weaknesses in theoretical models. We now apply our technique to the solar analogues 16CygA and 16CygB, being amongst the best targets in the Kepler field to test the diagnostic potential of seismic inversions. The combination of various seismic indicators helps to provide more constrained and accurate fundamendal parameters for these stars. We use the latest seismic, spectroscopic and interferometric observational constraints in the litterature for this system to determine reference models independently for both stars. We carry out seismic inversions of the acoustic radius, the mean density and a core conditions indicator. We note that a degenerac...
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...
Development of a coarse-grained water forcefield via multistate iterative Boltzmann inversion
Moore, Timothy C; McCabe, Clare
2015-01-01T23:59:59.000Z
A coarse-grained water model is developed using multistate iterative Boltzmann inversion. Following previous work, the k-means algorithm is used to dynamically map multiple water molecules to a single coarse-grained bead, allowing the use of structure-based coarse-graining methods. The model is derived to match the bulk and interfacial properties of liquid water and improves upon previous work that used single state iterative Boltzmann inversion. The model accurately reproduces the density and structural correlations of water at 305 K and 1.0 atm, stability of a liquid droplet at 305 K, and shows little tendency to crystallize at physiological conditions. This work also illustrates several advantages of using multistate iterative Boltzmann inversion for deriving generally applicable coarse-grained forcefields.
Waves and vortices in the inverse cascade regime of stratified turbulence with or without rotation
Herbert, Corentin; Rosenberg, Duane; Pouquet, Annick
2015-01-01T23:59:59.000Z
We study the partition of energy between waves and vortices in stratified turbulence, with or without rotation, for a variety of parameters, focusing on the behavior of the waves and vortices in the inverse cascade of energy towards the large scales. To this end, we use direct numerical simulations in a cubic box at a Reynolds number Re=1000, with the ratio between the Brunt-V\\"ais\\"al\\"a frequency N and the inertial frequency f varying from 1/4 to 20, together with a purely stratified run. The Froude number, measuring the strength of the stratification, varies within the range 0.02 energy spectra and fluxes exhibit characteristics of an inverse cascade, even though their energy is not conserved. Surprisingly, the slow vortices still dominate when the ratio N/f increases, also in the stratified case, although less and less so. However, when N/f increases, the inverse cascade of the slow modes becomes we...
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.
Foxall, W; Cunningham, C; Mellors, R; Templeton, D; Dyer, K; White, J
2012-02-27T23:59:59.000Z
Many clandestine development and production activities can be conducted underground to evade surveillance. The purpose of the study reported here was to develop a technique to detect underground facilities by broad-area search and then to characterize the facilities by inversion of the collected data. This would enable constraints to be placed on the types of activities that would be feasible at each underground site, providing a basis the design of targeted surveillance and analysis for more complete characterization. Excavation of underground cavities causes deformation in the host material and overburden that produces displacements at the ground surface. Such displacements are often measurable by a variety of surveying or geodetic techniques. One measurement technique, Interferometric Synthetic Aperture Radar (InSAR), uses data from satellite-borne (or airborne) synthetic aperture radars (SARs) and so is ideal for detecting and measuring surface displacements in denied access regions. Depending on the radar frequency and the acquisition mode and the surface conditions, displacement maps derived from SAR interferograms can provide millimeter- to centimeter-level measurement accuracy on regional and local scales at spatial resolution of {approx}1-10 m. Relatively low-resolution ({approx}20 m, say) maps covering large regions can be used for broad-area detection, while finer resolutions ({approx}1 m) can be used to image details of displacement fields over targeted small areas. Surface displacements are generally expected to be largest during or a relatively short time after active excavation, but, depending on the material properties, measurable displacement may continue at a decreasing rate for a considerable time after completion. For a given excavated volume in a given geological setting, the amplitude of the surface displacements decreases as the depth of excavation increases, while the area of the discernable displacement pattern increases. Therefore, the ability to detect evidence for an underground facility using InSAR depends on the displacement sensitivity and spatial resolution of the interferogram, as well as on the size and depth of the facility and the time since its completion. The methodology development described in this report focuses on the exploitation of synthetic aperture radar data that are available commercially from a number of satellite missions. Development of the method involves three components: (1) Evaluation of the capability of InSAR to detect and characterize underground facilities ; (2) inversion of InSAR data to infer the location, depth, shape and volume of a subsurface facility; and (3) evaluation and selection of suitable geomechanical forward models to use in the inversion. We adapted LLNL's general-purpose Bayesian Markov Chain-Monte Carlo procedure, the 'Stochastic Engine' (SE), to carry out inversions to characterize subsurface void geometries. The SE performs forward simulations for a large number of trial source models to identify the set of models that are consistent with the observations and prior constraints. The inverse solution produced by this kind of stochastic method is a posterior probability density function (pdf) over alternative models, which forms an appropriate input to risk-based decision analyses to evaluate subsequent response strategies. One major advantage of a stochastic inversion approach is its ability to deal with complex, non-linear forward models employing empirical, analytical or numerical methods. However, while a geomechanical model must incorporate adequate physics to enable sufficiently accurate prediction of surface displacements, it must also be computationally fast enough to render the large number of forward realizations needed in stochastic inversion feasible. This latter requirement prompted us first to investigate computationally efficient empirical relations and closed-form analytical solutions. However, our evaluation revealed severe limitations in the ability of existing empirical and analytical forms to predict deformations from undergro
A quantitative study of the low-level inversion in interior Alaska
Adamowicz, Peter Michael
1972-01-01T23:59:59.000Z
temperature with time. This was primarily due to the balance between the net radiation, net turbulent trans- fer, and snow-layer conduction terms. The mean temperature of the inversion layer in January 1971 cooled about 3C day . This was due to the strong... 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...
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.
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.
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.
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.
Botero, Cristina, Ph. D. Massachusetts Institute of Technology
2014-01-01T23:59:59.000Z
The continuous conveying of a solid feedstock like pulverized coal into a pressurized environment is a challenging task required in multiple industrial processes. Plants based on pressurized, entrained-flow gasifiers (EFG) ...
Boakye, Emmanuel
2012-10-19T23:59:59.000Z
voltage swing at the output of the TIA. The proposed TIA filter has a channel bandwidth of 20MHz, and can processes interferers of +/- 10mA fully differential without saturating the opamps. The maximum single ended voltage swing at all the nodes...
Ratcliff, Robert R.
1989-01-01T23:59:59.000Z
grid location (i ? ?, . j, 1) is 1 1 c7h ) u r r ? u r t ?. 25 '+r s+r '+r r+r y ooy f (2 ? 25) I, )+1/2 I I I I k? U 0+, )+I 2) I 4'(I, J) I 0+v2J+v2) X~II+1/2 JsV2) II+V2J+V2) Xy~(l+V2J+1/2) ~(i+1, J-1) Primary Cells? Secondary Cell I... into the secondary box is accounted for, Eq. (2-22) becomes p?6, u+ p, 6?v (P*s), +sr, qsr (16*v)i~sr, ? sr (4'*v)i-sr, +sr (P*s)i-sr, -rr)? -e( . . . , ? . . . , ? . . . , + . . . , =0 which is equivalent to (2 ? 28) p?6?4 + p**6?P ? e6??P = 0 (2 ? 29...
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
Biosystem Dynamics & Design | EMSL
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Dynamics & Design Overview Atmospheric Aerosol Systems Biosystem Dynamics & Design Energy Materials & Processes Terrestrial & Subsurface Ecosystems Biosystem Dynamics &...
Chen, Jinsong
among seismic and electric attributes and reservoir parameters from distant borehole logs. In this studyJoint inversion of marine seismic AVA and CSEM data using statistical rock-physics models and Markov random fields Jinsong Chen1 and G. Michael Hoversten2 ABSTRACT Joint inversion of seismic AVA
Chen, Jinsong
studies, reservoir parameters as well as geophysical attributes at unsampled locations were considered relationships between the reservoir parameters and the geophysical attributes were enforced. Those methods and the geophysical attributes. Unlike conventional inversion, our stochastic inversion of seismic P-wave velocity
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
van Vliet, Lucas J.
with oblique internal layering, best imaged on seismic reflection profiles, where three geometric elementsHigh-resolution clinoform characterization by 2-D model-driven seismic Bayesian inversion Daria of seismic data always presents an inversion problem. Instead of analyzing the data trace by trace, we
Olson, Christopher Charles
2001-01-01T23:59:59.000Z
) the south to north progression of inversion from Early to Late Miocene time, 2) magnitudes of inversion documented within each basin, 3) the suggested NW-SE orientation of []?,4) the approximately N-S azimuth of compression that caused observed styles...
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.
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 devel oped in computer graphics for computing the reflection of light in 3D
Torres-Verdín, 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
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
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
Chen, Jinsong
Joint inversion of marine seismic AVA and CSEM data using statistical rock-physics models, Chevron ETC Summary Joint inversion of seismic AVA and CSEM data needs rock- physics models to link seismic attributes to electrical properties. Ideally, we can develop physical-based models (e.g., Gassmann
Boccacci, Patrizia
An inversion method for the restoration of chopped and nodded images M. Bertero a , P. Boccacci b an iterative inversion method for the restoration of chopped and nodded images, typical of thermal infrared reduced by combining a few (24) images taken with different chopping/nodding throws of small amplitude
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
On the inverse Magnus effect in free molecular flow Patrick D. Weidman
Huang, Jianyu
reproduces the inverse Magnus force on a sphere reported by Borg, So¨derholm and Esse´n Phys. Fluids 15, 736 a calculation of the transverse force on a spinning sphere translating in a rarefied gas, showing that its and transverse momentum proportional to v2 imparted to the body contribute to drag and lift forces, respectively
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
Remote sensing of breaking wave phase speeds with application to non-linear depth inversions
Haller, Merrick
Remote sensing of breaking wave phase speeds with application to non-linear depth inversions high-resolution remote sensing video and surface elevation records from fixed, in-situ wave gages. Wave phase speeds are extracted from the remote sensing data using a feature tracking technique, and local
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
Stochastic inversion of seismic PP and PS data for reservoir parameter estimation
Chen, Jinsong
Stochastic inversion of seismic PP and PS data for reservoir parameter estimation Jinsong Chen1-based Bayesian method developed previously for inverting seismic PP data only, by including PS responses and time et al., 2013) and res- ervoir characterization (Brettwood et al., 2013). In this study, we use
Torres-Verdín, Carlos
aerial coverage of post-stack three-dimensional seismic data. A systematic field study is presented, by making quantitative use of the post-stack seismic data, geostatistical inversion considerably reduces acquired at control wells and the seismic data measured at every node of the 3D seismic cube (see
Simultaneous Inversion of Production Data and Seismic Attributes: Application to a Synthetic
Boyer, Edmond
Simultaneous Inversion of Production Data and Seismic Attributes: Application to a Synthetic SAGD and Seismic Attributes: Application to a Synthetic SAGD Produced Field Case -- The joint use of production such as facies, porosity and permeability into reservoirs from production data and seismic attributes
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
Stochastic inversion of seismic PP and PS data for reservoir parameter estimation
Chen, Jinsong
surveying has been used for hydrocarbon exploration for decades because it can capture the seismic wavefieldStochastic inversion of seismic PP and PS data for reservoir parameter estimation Jinsong Chen1 and Michael E. Glinsky2 ABSTRACT We have investigated the value of isotropic seismic con- verted-wave (i
Goldberg, Ken
IPIP: A new approach to inverse planning for HDR brachytherapy by directly optimizing dosimetric; published 22 June 2011) Purpose: Many planning methods for high dose rate (HDR) brachytherapy require brachytherapy by directly optimizing the dose distribution based on dosimetric criteria. Methods: The authors
Brachytherapy 3 (2004) 147152 Comparison of inverse planning simulated annealing and geometrical
Pouliot, Jean
2004-01-01T23:59:59.000Z
Brachytherapy 3 (2004) 147152 Comparison of inverse planning simulated annealing and geometrical optimization for prostate high-dose-rate brachytherapy I-Chow J. Hsu1,*, Etienne Lessard1 , Vivian Weinberg2) algorithm for optimization of high- dose-rate (HDR) brachytherapy has been previously described
Spectral signatures of compact sources in the inverse Compton catastrophe limit
Petropoulou, Maria; Mastichiadis, Apostolos
2015-01-01T23:59:59.000Z
The inverse Compton catastrophe is defined as a dramatic rise in the luminosity of inverse Compton scattered photons. It is described by a non-linear loop of radiative processes that sets in for high values of the electron compactness and is responsible for the efficient transfer of energy from electrons to photons, predominantly through inverse Compton scatterings. We search for the conditions that drive a magnetized non-thermal source to the inverse Compton catastrophe regime and study its multi-wavelength (MW) photon spectrum. We develop a generic analytical framework and use numerical calculations as a backup to the analytical predictions. We find that the escaping radiation from a source in the Compton catastrophe regime bears some unique features. The MW photon spectrum is a broken power law with a break at $\\sim m_e c^2$ due to the onset of the Klein-Nishina suppression. The spectral index below the break energy depends on the electron and magnetic compactnesses logarithmically, while it is independent...
A unified approach for inversion problems in intensity-modulated radiation therapy
Censor, Yair
intensities (radiation intensity map) deliverable by all beamlets, that would result in a clinically value, however, this radiation intensity map must be implementable, in a clinically acceptable formA unified approach for inversion problems in intensity-modulated radiation therapy Yair Censor1
Automatic S-acts and inverse semigroup presentations Erzsebet Rita Dombi
St Andrews, University of
Automatic S-acts and inverse semigroup presentations ErzsÂ´ebet Rita Dombi Ph.D. Thesis University.3 Automatic groups and semigroups . . . . . . . . . . . . . . . . . . . . . . . 14 3 Automatic semigroup acts.2 SchÂ¨utzenberger automatic regular semigroups . . . . . . . . . . . . . . . . . 25 3.3 Examples
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.
Anisotropic inversion of refracted waves in vertical cable data in the presence of dip
Edinburgh, University of
method in vertical seismic profiles (VSP). In the VSP case, the anisotropic phase-slowness surface local exploration tech- nique, vertical-cable (VC) seismic uses vertical arrays of hydrophones deployed in the waterAnisotropic inversion of refracted waves in vertical cable data in the presence of dip Hejie Wang1
P-wave traveltime inversion in weakly anisotropic media: a preliminary study
Cerveny, Vlastislav
(vertical seismic profiling) experiment, which provides a good angular illumination, and we study a general anisotropy in the inversion process. We use a vertical seismic profiling (VSP) configuration Republic. E-mail: b.ruzek@ig.cas.cz; ip@ig.cas.cz Abstract There is an increasing interest in seismic
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
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
An inverse relationship between production and export efficiency in the Southern Ocean
An inverse relationship between production and export efficiency in the Southern Ocean Kanchan of studies have been carried out in the Southern Ocean to look at export production using drifting sediment the existing relationships between production, export efficiency, and temperature to derive satellite
An inverse relationship between production and export efficiency in the Southern Ocean
Buesseler, Ken
An inverse relationship between production and export efficiency in the Southern Ocean Kanchan out in the Southern Ocean to look at export production using drifting sediment traps and thorium-234 between production, export efficiency, and temperature to derive satellite-based carbon export estimates
SYNTHETIC APERTURE INVERSION FOR NON-FLAT TOPOGRAPHY C. J. Nolan *
Cheney, Margaret
SYNTHETIC APERTURE INVERSION FOR NON-FLAT TOPOGRAPHY C. J. Nolan * , M. Cheney ** * Department topography is known but not necessarily flat. We consider two cases, corresponding to the degree and the topography to avoid artifacts. We show that the algorithm correctly reproduces certain features of the scene
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
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
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.
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
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
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
INVESTIGATING EVOLUTIONARY LINES OF LEAST RESISTANCE USING THE INVERSE PROTEIN-FOLDING
Naylor, Gavin
INVESTIGATING EVOLUTIONARY LINES OF LEAST RESISTANCE USING THE INVERSE PROTEIN-FOLDING PROBLEM J sequences that fold to a specified target protein conformation based on Sun et al's Grand Canonical (GC There is a large body of work devoted to solving the protein folding problem, which is defined as follows: Given
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
The Asperity-deformation Model Improvements and Its Applications to Velocity Inversion
Bui, Hoa Q.
2010-01-16T23:59:59.000Z
-of-nails? (BNM) model. Existing analytic solutions include one that assumes the host rock is infinitely more rigid than the fractures, and one that takes the host-rock compliance into account. Inversion results indicate that although both solutions can fit...
Structural fabric of the Palisades Monocline: a study of positive inversion, Grand Canyon, Arizona
Orofino, James Cory
2005-08-29T23:59:59.000Z
contraction. The magnitude of inversion is estimated to be 25% based on vertical offset across the fault, although this does not account for flexure or horizontal shortening. The preferred N50W 90 joint and vein orientation and N50W 68 NE and SW conjugate...
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
Annual Logging Symposium, June 21-24, 2009 INVERSION OF SECTOR-BASED LWD DENSITY MEASUREMENTS
Torres-Verdín, Carlos
of Petrophysicists and Well Log Analysts (SPWLA) and the submitting authors. This paper was prepared for presentation MEASUREMENTS ACQUIRED IN LAMINATED SEQUENCES PENETRATED BY HIGH- ANGLE AND HORIZONTAL WELLS Alberto Mendoza. ABSTRACT We show that inversion processing improves the petrophysical interpretation of logging-while-drilling
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
One-dimensional inversion of airborne electromagnetic data: application to oil sands exploration
Farquharson, Colin G.
One-dimensional inversion of airborne electromagnetic data: application to oil sands exploration, and Larry Mewhort. · Richard Kellett, formerly of Komex International. #12;Oil sands in Canada #12;Source: Mark Savage, "Oil Sands Characteristics - Geology," 9 April 2002 Wabasca Calgary Edmonton Cold Lake
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
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
Inversion of weighted Radon transforms via finite Fourier series weight approximations
Guillement, Jean-Pol
Inversion of weighted Radon transforms via finite Fourier series weight approximations J Moscow, Russia e-mail: novikov@cmap.polytechnique.fr Abstract. We consider weighted Radon transforms approach by numerical examples for the case of the attenuated Radon transforms in the framework
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
ACOUSTIC IMPEDANCE INVERSION FOR STATIC AND DYNAMIC CHARACTERIZATION OF A CO2 EOR PROJECT,
improved reservoir characterization of the incised valley-fill Morrow Sandstones and understanding of the CO2 flood performance at Postle field. The use of traditional P-wave reflectivity data between the sandstone and the surrounding shale. Acoustic impedance inversion of the P-wave reflectivity
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.
Seismogenic patterns in the Taiwan region: insights from source parameter inversion of BATS data
Lin, Andrew Tien-Shun
Seismogenic patterns in the Taiwan region: insights from source parameter inversion of BATS data Honn Kao*, Pei-Ru Jian Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan, ROC Received 1 earthquakes that occurred in the Taiwan region between July 1995 and June 1998, using waveforms recorded
A tomographic approach to inverse Mie particle characterization from scattered light
Jaffe, Jules
A tomographic approach to inverse Mie particle characterization from scattered light Jules S. Jaffe field of a homogeneous sphere from the observation of its scattered light field is explored. Using Fourier relationship between a component of the internal E-field and the scattered light in a preferred
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
Coding into a source: an inverse rate-distortion Anant Sahai
California at Berkeley, University of
Sahai (UC Berkeley) Inverse Rate Distortion Sep 27, 2006 1 / 27 #12;Suppose the aliens landed. . . Your Distortion Sep 27, 2006 2 / 27 #12;Suppose the aliens landed. . . Your mission: reverse 27, 2006 2 / 27 #12;Suppose the aliens landed. . . Your mission: reverse
The role of defects in light induced domain inversion in lithium Christian Sandmann1
Dierolf, Volkmar
The role of defects in light induced domain inversion in lithium niobate Christian Sandmann1 bombardment [811] and UV light [1216]. Several groups have studied light induced poling effects, which have crystals [12, 13]. In this technique using UV light, interference patterns are transfered into domain
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
A flow-induced phase inversion in immiscible polymer blends containing a liquid-crystalline polymer
Paris-Sud XI, Université de
2 , 3 with being the viscosity ratio of the blend components at the blending shear rate. Luciani etA flow-induced phase inversion in immiscible polymer blends containing a liquid-crystalline polymer0148-6055 00 01504-2 I. INTRODUCTION The increasing application of polymer blends for the elaboration
Chen, Ying "Ada"
Gaussian frequency blending algorithm with Matrix Inversion Tomosynthesis (MITS) and Filtered Back and applied to the FBP reconstructions. A frequency weighting parameter was studied to blend the high-passed MITS with low-passed FBP frequency components. Four different reconstruction methods were investigated
Cross, Rebecca
2012-04-23T23:59:59.000Z
of the cortical inversion was stable in each generation; in no instances did F1 and F2 lines with inverted rows spontaneously lose them, nor did F1 and F2 lines with normal cortexes spontaneously generate inverted cortical rows. These results demonstrate...
A Brief Comment on Post inversion formula for the Laplace transform
Jose Javier Garcia MOreta
2007-03-06T23:59:59.000Z
In this paper we comment the Post inversion formula for Laplace transform, and its possible application to the branch of Analytic Number theory (Arithmetical functions, RH and PNT), involving a condition in the form of iterated limit to calculate the Riemann Hypothesis.
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 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.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Ray, J.; Lee, J.; Yadav, V.; Lefantzi, S.; Michalak, A. M.; van Bloemen Waanders, B.
2015-04-29T23:59:59.000Z
Atmospheric inversions are frequently used to estimate fluxes of atmospheric greenhouse gases (e.g., biospheric CO2 flux fields) at Earth's surface. These inversions typically assume that flux departures from a prior model are spatially smoothly varying, which are then modeled using a multi-variate Gaussian. When the field being estimated is spatially rough, multi-variate Gaussian models are difficult to construct and a wavelet-based field model may be more suitable. Unfortunately, such models are very high dimensional and are most conveniently used when the estimation method can simultaneously perform data-driven model simplification (removal of model parameters that cannot be reliably estimated) and fitting.more »Such sparse reconstruction methods are typically not used in atmospheric inversions. In this work, we devise a sparse reconstruction method, and illustrate it in an idealized atmospheric inversion problem for the estimation of fossil fuel CO2 (ffCO2) emissions in the lower 48 states of the USA. Our new method is based on stagewise orthogonal matching pursuit (StOMP), a method used to reconstruct compressively sensed images. Our adaptations bestow three properties to the sparse reconstruction procedure which are useful in atmospheric inversions. We have modified StOMP to incorporate prior information on the emission field being estimated and to enforce non-negativity on the estimated field. Finally, though based on wavelets, our method allows for the estimation of fields in non-rectangular geometries, e.g., emission fields inside geographical and political boundaries. Our idealized inversions use a recently developed multi-resolution (i.e., wavelet-based) random field model developed for ffCO2 emissions and synthetic observations of ffCO2 concentrations from a limited set of measurement sites. We find that our method for limiting the estimated field within an irregularly shaped region is about a factor of 10 faster than conventional approaches. It also reduces the overall computational cost by a factor of 2. Further, the sparse reconstruction scheme imposes non-negativity without introducing strong nonlinearities, such as those introduced by employing log-transformed fields, and thus reaps the benefits of simplicity and computational speed that are characteristic of linear inverse problems.« less
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.
Kissock, J. K.; Haberl, J. S.; Claridge, D. E.
2002-11-01T23:59:59.000Z
This report summarizes the results of ASHRAE Research Project 1050: Development of a Toolkit for Calculating Linear, Change-Point Linear and Multiple Linear Inverse Building Energy Analysis Models. The Inverse Modeling Toolkit (WIT) is a FORTRAN 90...
for Gravity, Electrical and Magnetic Studies, Colorado School of Mines SUMMARY Inversion based on L2 norm has
Design Editorial Design: The New Frontier
Papalambros, Panos
countries with lower labor costs. In a sense, our research and education agenda must transition from a "pure for sustainable growth and innovation, and design is the surest path to realizing it. Design is the new frontier with innovation, as exemplified in frequent references to design in the business press. In the pursuit for sus
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.
Torres-Verdín, Carlos
by these attribute sections. Introduction Full waveform pre-stack seismic inversion as an aid for reservoir. Travel time inversion or even migration of seismic wave field in pre-stack domain provides an estimate for reservoir characterization. Forward Problem and Optimization In our inversion we make use of data
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
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.
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.
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].
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.
Decay estimates for One-dimensional wave equations with inverse power potentials
O. Costin; M. Huang
2014-10-23T23:59:59.000Z
We study the one-dimensional wave equation with an inverse power potential that equals $const.x^{-m}$ for large $|x|$ where $m$ is any positive integer greater than or equal to 3. We show that the solution decays pointwise like $t^{-m}$ for large $t$, which is consistent with existing mathematical and physical literature under slightly different assumptions (see e.g. Bizon, Chmaj, and Rostworowski, 2007; Donninger and Schlag, 2010; Schlag, 2007). Our results can be generalized to potentials consisting of a finite sum of inverse powers, the largest of which being $const.x^{-\\alpha}$ where $\\alpha>2$ is a real number, as well as potentials of the form $const.x^{-m}+O(x^{-m-\\delta_1})$ with $\\delta_1>3$.
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_...
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.
Encapsulation of nanoclusters in dried gel materials via an inverse micelle/sol gel synthesis
Martino, A.; Yamanaka, S.A.; Kawola, J.S.; Showalter, S.K.; Loy, D.A.
1998-09-29T23:59:59.000Z
A dried gel material sterically entrapping nanoclusters of a catalytically active material and a process to make the material via an inverse micelle/sol-gel synthesis are disclosed. A surfactant is mixed with an apolar solvent to form an inverse micelle solution. A salt of a catalytically active material, such as gold chloride, is added along with a silica gel precursor to the solution to form a mixture. To the mixture are then added a reducing agent for the purpose of reducing the gold in the gold chloride to atomic gold to form the nanoclusters and a condensing agent to form the gel which sterically entraps the nanoclusters. The nanoclusters are normally in the average size range of from 5--10 nm in diameter with a monodisperse size distribution. 1 fig.
Encapsulation of nanoclusters in dried gel materials via an inverse micelle/sol gel synthesis
Martino, Anthony (Albuquerque, NM); Yamanaka, Stacey A. (Dallas, TX); Kawola, Jeffrey S. (Albuquerque, NM); Showalter, Steven K. (Albuquerque, NM); Loy, Douglas A. (Albuquerque, NM)
1998-01-01T23:59:59.000Z
A dried gel material sterically entrapping nanoclusters of a catalytically active material and a process to make the material via an inverse micelle/sol-gel synthesis. A surfactant is mixed with an apolar solvent to form an inverse micelle solution. A salt of a catalytically active material, such as gold chloride, is added along with a silica gel precursor to the solution to form a mixture. To the mixture are then added a reducing agent for the purpose of reducing the gold in the gold chloride to atomic gold to form the nanoclusters and a condensing agent to form the gel which sterically entraps the nanoclusters. The nanoclusters are normally in the average size range of from 5-10 nm in diameter with a monodisperse size distribution.
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...
Inversed Vernier effect based single-mode laser emission in coupled microdisks
Li, Meng; Wang, Kaiyang; Li, Jiankai; Xiao, Shumin; Song, Qinghai
2015-01-01T23:59:59.000Z
Recently, on-chip single-mode laser emission has attracted considerable research attention due to its wide applications. While most of single-mode lasers in coupled microdisks or microrings have been qualitatively explained by either Vernier effect or inversed Vernier effect, none of them have been experimentally confirmed. Here, we studied the mechanism for single-mode operation in coupled microdisks. We found that the mode numbers had been significantly reduced to nearly single-mode within a large pumping power range from threshold to gain saturation. The detail laser spectra showed that the largest gain and the first lasing peak were mainly generated by one disk and the laser intensity was proportional to the frequency detuning. The corresponding theoretical analysis showed that the experimental observations were dominated by internal coupling within one cavity, which was similar to the recently explored inversed Vernier effect in two coupled microrings. We believe our finding will be important for underst...
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.
Mendez, M P A; Miraglia, J E
2015-01-01T23:59:59.000Z
Exchange potentials for specific orbitals of noble gases are calculated by inverting the corresponding Hartree-Fock wavefunctions. This procedure was performed by using a Depurated Inversion Method, which is presented here. The basic idea of the method relies upon the substitution of Hartree-Fock orbitals and eigenvalues into the Kohn-Sham equation. Through inversion, the corresponding effective potential were obtained. A further depuration of the potential should be performed. It consists in a careful optimization which shatters the poles and also ensures the fulfillment of the appropriate boundary conditions. The method is not restricted to the ground state or to a nodeless orbital. It allows to reproduce the input energies and wavefunctions with a remarkable degree of accuracy.
Computation & design for nanophotonics
Oskooi, Ardavan F
2010-01-01T23:59:59.000Z
The versatility of computational design as an alternative to design by nanofabrication has made computers a reliable design tool in nanophotonics. Given that almost any 2d pattern can be fabricated at infrared length scales, ...
Kieval, Tamar S. (Tamar Shoshana), 1980-
2004-01-01T23:59:59.000Z
Blast design is a necessary part of design for more buildings in the United States. Blast design is no longer limited to underground shelters and sensitive military sites, buildings used by the general public daily must ...
Control System Design Using Finite Laplace Transform Theory
Das, Subhendu
2011-01-01T23:59:59.000Z
The Laplace transform theory violates a very fundamental requirement of all engineering systems. We show that this theory assumes that all signals must exist over infinite time interval. Since in engineering this infinite time assumption is not meaningful and feasible, this paper presents a design for linear control systems using the well known theory of Finite Laplace transform (FLT). The major contributions of this paper can be listed as: (a) A design principle for linear control systems using FLT, (b) A numerical inversion method for the FLT with examples, (c) A proof that the FLT does not satisfy the convolution theorem as normally required in engineering design and analysis, and (d) An observation that the FLT is conceptually similar to the analog equivalent of the Finite Impulse Response (FIR) digital filter.
Designing optimal greenhouse gas observing networks that consider performance and cost
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Lucas, D. D.; Yver Kwok, C.; Cameron-Smith, P.; Graven, H.; Bergmann, D.; Guilderson, T. P.; Weiss, R.; Keeling, R.
2014-12-23T23:59:59.000Z
Emission rates of greenhouse gases (GHGs) entering into the atmosphere can be inferred using mathematical inverse approaches that combine observations from a network of stations with forward atmospheric transport models. Some locations for collecting observations are better than others for constraining GHG emissions through the inversion, but the best locations for the inversion may be inaccessible or limited by economic and other non-scientific factors. We present a method to design an optimal GHG observing network in the presence of multiple objectives that may be in conflict with each other. As a demonstration, we use our method to design a prototypemore »network of six stations to monitor summertime emissions in California of the potent GHG 1,1,1,2-tetrafluoroethane (CH2FCF3, HFC-134a). We use a multiobjective genetic algorithm to evolve network configurations that seek to jointly maximize the scientific accuracy of the inferred HFC-134a emissions and minimize the associated costs of making the measurements. The genetic algorithm effectively determines a set of "optimal" observing networks for HFC-134a that satisfy both objectives (i.e., the Pareto frontier). The Pareto frontier is convex, and clearly shows the tradeoffs between performance and cost, and the diminishing returns in trading one for the other. Without difficulty, our method can be extended to design optimal networks to monitor two or more GHGs with different emissions patterns, or to incorporate other objectives and constraints that are important in the practical design of atmospheric monitoring networks.« less
A quantitative study of the low-level inversion in interior Alaska
Adamowicz, Peter Michael
1972-01-01T23:59:59.000Z
cooling effect of net radiation and the small cooling effect of advection. The effects of cloud cover were impor- tant both in the formation and in the breakdown of the inversion. iv ACKNOWLEDGMENTS The author gratefully would like to acknowledge... Solar radiation is not considered in this equation, since, as mentioned before, the effect of it was small. A statistical study of the terms in ( 6) will be found in Appendix B. 2. Effect of cloud cover. Clouds act essentially as black- bodies...
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.
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\