Stochastic Joint Inversion for Integrated Data Interpretation...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Stochastic Joint Inversion for Integrated Data Interpretation in Geothermal Exploration Stochastic Joint Inversion for Integrated Data Interpretation in Geothermal Exploration...
Joint inversion of electrical and seismic data for Fracture char...
Broader source: Energy.gov (indexed) [DOE]
Joint inversion of electrical and seismic data for Fracture char. and Imaging of Fluid Flow in Geothermal Systems Joint inversion of electrical and seismic data for Fracture char....
Image Appraisal for 2D and 3D Electromagnetic Inversion
Alumbaugh, D.L.; Newman, G.A.
1999-01-28T23:59:59.000Z
Linearized methods are presented for appraising image resolution and parameter accuracy in images generated with two and three dimensional non-linear electromagnetic inversion schemes. When direct matrix inversion is employed, the model resolution and posterior model covariance matrices can be directly calculated. A method to examine how the horizontal and vertical resolution varies spatially within the electromagnetic property image is developed by examining the columns of the model resolution matrix. Plotting the square root of the diagonal of the model covariance matrix yields an estimate of how errors in the inversion process such as data noise and incorrect a priori assumptions about the imaged model map into parameter error. This type of image is shown to be useful in analyzing spatial variations in the image sensitivity to the data. A method is analyzed for statistically estimating the model covariance matrix when the conjugate gradient method is employed rather than a direct inversion technique (for example in 3D inversion). A method for calculating individual columns of the model resolution matrix using the conjugate gradient method is also developed. Examples of the image analysis techniques are provided on 2D and 3D synthetic cross well EM data sets, as well as a field data set collected at the Lost Hills Oil Field in Central California.
Joint inversion of electrical and seismic data for Fracture char...
Broader source: Energy.gov (indexed) [DOE]
Joint inversion of electrical and seismic data for Fracture char. and Imaging of Fluid Flow in Geothermal Systems Michael Batzle, PI Colorado School of Mines Track Name: Fluid...
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...
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
van Vliet, Lucas J.
High-resolution clinoform characterization by 2-D model-driven seismic Bayesian inversion Daria Summary Many important details of potential subsurface reservoirs that we wish to characterize are only propose an automated procedure that adjusts the parameters of a two-dimensional geological model
Slimane Zaim; Abdelkader Bahache
2014-10-06T23:59:59.000Z
We obtain exact solutions of the 2D Schr\\"odinger equation with the Singular Even-Power and Inverse-Power Potentials in non-commutative complex space, using the Power-series expansion method. Hence we can say that the Schr\\"odinger equation in non-commutative complex space describes to the particles with spin (1/2)in an external uniform magnitic field. Where the noncommutativity play the role of magnetic field with created the total magnetic moment of particle with spin 1/2, who in turn shifted the spectrum of energy. Such effects are similar to the Zeeman splitting in a commutative space.
Numerical solution of 2-D nonlinear inverse heat conduction problems using finite-element techniques
Khachfe, R.A.; Jarny, Y.
2000-02-01T23:59:59.000Z
A general method is presented for solving different classes of nonlinear inverse heat conduction problems (IHCP) for two-dimensional, arbitrarily shaped bodies. It is based on the systematic use of a finite-element library. It is shown that, following this approach, the conjugate gradient method can be easily implemented. The method offers a very wide field of practical applications in inverse thermal analysis, while reducing very significantly the amount of work which remains specific for each particular IHPC. Two numerical experiments illustrate the influence of data errors and the iterative regularization principle.
Direct Reservoir Parameter Estimation Using Joint Inversion ofMarine Seismic AVA&CSEM Data
Hoversten, G. Michael; Cassassuce, Florence; Gasperikova, Erika; Newman,Gregory A.; Rubin, Yoram; Zhangshuan, Hou; Vasco, Don
2005-01-12T23:59:59.000Z
A new joint inversion algorithm to directly estimate reservoir parameters is described. This algorithm combines seismic amplitude versus angle (AVA) and marine controlled source electromagnetic (CSEM) data. The rock-properties model needed to link the geophysical parameters to the reservoir parameters is described. Errors in the rock-properties model parameters, measured in percent, introduce errors of comparable size in the joint inversion reservoir parameter estimates. Tests of the concept on synthetic one-dimensional models demonstrate improved fluid saturation and porosity estimates for joint AVA-CSEM data inversion (compared to AVA or CSEM inversion alone). Comparing inversions of AVA, CSEM, and joint AVA-CSEM data over the North Sea Troll field, at a location with well control, shows that the joint inversion produces estimated gas saturation, oil saturation and porosity that is closest (as measured by the RMS difference, L1 norm of the difference, and net over the interval) to the logged values whereas CSEM inversion provides the closest estimates of water saturation.
van Vliet, Lucas J.
High-resolution reservoir characterization by 2-D model-driven seismic Bayesian inversion the match with the seismic data. This low- parameterization inversion approach thus uses geological shapes of block F3 in the North Sea. Field description Geological setting F3 is a block in the Dutch sector
2D Joint Inversion Of Dc And Scalar Audio-Magnetotelluric Data...
Authors F. A. M. Santos, A. R. A. Afonso and A. Dupis Published Journal Journal of Geophysics and Engineering, 20070101 DOI Not Provided Check for DOI availability: http:...
2D Joint Inversion Of Dc And Scalar Audio-Magnetotelluric Data In The
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: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:Ezfeedflag JumpID-fTriWildcat 1 Wind ProjectsourceInformationColorado School20090: SWRCB
Chen, Jinsong
Joint stochastic inversion of geophysical data for reservoir parameter estimation Jinsong Chen the stochastic framework, both reservoir parameters and geophysical attributes at unsampled locations. Introduction Conventional methods for reservoir parameter estimation using multiple sources of geophysical data
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.
Meju, Max
multidimensional non- invasive dc resistivity and seismic refraction investigations of the near-surface have and seismic data Luis A. Gallardo1 and Max A. Meju Department of Environmental Science, Lancaster University-gradients of electrical resistivity and seismic velocity as constraints so as to investigate more precisely
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.
Tokam, A K; Tabod, C T; Nyblade, A A; Julia, J; Wiens, D A; Pasyanos, M E
2010-02-18T23:59:59.000Z
The Cameroon Volcanic Line (CVL) is a major geologic feature that cuts across Cameroon from the south west to the north east. It is a unique volcanic lineament which has both an oceanic and a continental sector and consists of a chain of Tertiary to Recent, generally alkaline volcanoes stretching from the Atlantic island of Pagalu to the interior of the African continent. The oceanic sector includes the islands of Bioko (formerly Fernando Po) and Sao Tome and Principe while the continental sector includes the Etinde, Cameroon, Manengouba, Bamboutos, Oku and Mandara mountains, as well as the Adamawa and Biu Plateaus. In addition to the CVL, three other major tectonic features characterize the region: the Benue Trough located northwest of the CVL, the Central African Shear Zone (CASZ), trending N70 degrees E, roughly parallel to the CVL, and the Congo Craton in southern Cameroon. The origin of the CVL is still the subject of considerable debate, with both plume and non-plume models invoked by many authors (e.g., Deruelle et al., 2007; Ngako et al, 2006; Ritsema and Allen, 2003; Burke, 2001; Ebinger and Sleep, 1998; Lee et al, 1994; Dorbath et al., 1986; Fairhead and Binks, 1991; King and Ritsema, 2000; Reusch et al., 2010). Crustal structure beneath Cameroon has been investigated previously using active (Stuart et al, 1985) and passive (Dorbath et al., 1986; Tabod, 1991; Tabod et al, 1992; Plomerova et al, 1993) source seismic data, revealing a crust about 33 km thick at the south-western end of the continental portion of the CVL (Tabod, 1991) and the Adamawa Plateau, and thinner crust (23 km thick) beneath the Garoua Rift in the north (Stuart et al, 1985) (Figure 1). Estimates of crustal thickness obtained using gravity data show similar variations between the Garoua rift, Adamawa Plateau, and southern part of the CVL (Poudjom et al., 1995; Nnange et al., 2000). In this study, we investigate further crustal structure beneath the CVL and the adjacent regions in Cameroon using 1-D shear wave velocity models obtained from the joint inversion of Rayleigh wave group velocities and P-receiver functions for 32 broadband seismic stations. From the 1-D shear wave velocity models, we obtain new insights into the composition and structure of the crust and upper mantle across Cameroon. After briefly reviewing the geological framework of Cameroon, we describe the data and the joint inversion method, and then interpret variations in crustal structure found beneath Cameroon in terms of the tectonic history of the region.
Torres-Verdín, Carlos
in this paper is also suitable for the quantitative interpretation of 4D seismic data. Simulation and InversionJoint Inversion of Reservoir Production Measurements and 3D Pre-Stack Seismic Data: Proof-stack seismic data and fluid production history. The production measurements and the seismic data
Brambilla, Sara [Los Alamos National Laboratory; Brown, Michael J. [Los Alamos National Laboratory
2012-06-18T23:59:59.000Z
A terrorist attack in a U.S. city utilizing biological weapons could have severe consequences. A biological agent could be aerosolized and emitted into the air in the middle of a city, invisibly traveling with the winds, and dosing an unknowing populace. The magnitude of the problem would only be revealed as sick people started arriving several days later at hospitals with symptoms, many already too ill to be saved. A national program has deployed a network of biological agent collectors in U.S. cities to provide early detection of a bio-weapon attack, thereby hastening medical intervention and potentially saving many thousands of lives. In fact, the most effective treatment takes place prior to infection or in its early stages and early warning might reduce the disease progression and, consequently, the possibility of an outbreak. If a biological attack were to occur in a city, one or more collectors may register hits with specific dosages and the city would be alerted that an attack had taken place. This piece of information alone, however, would not be enough to determine how serious the attack was, i.e., how much biological agent was released into the air and where the bio-plume traveled. The first responders and public health communities will want to know what regions were impacted, how many persons might get sick, which people most need medical supplies, and where to clean up. The law enforcement community will want to look for forensic evidence at the release location. The Bio-Agent Event Reconstruction Tool (BERT) has been developed in order to recreate what might have happened during an airborne biological agent attack based on biological agent collector measurements and wind collectors mounted around a city. The tool can be used to estimate possible release areas while eliminating other areas, and can estimate bounds on the amount of material released. The tool can then be used to project forward from the possible source areas to estimate potential hazard zones. Due to a unique source inversion technique - called the upwind collector footprint approach - the tool runs fast and the source regions can be determined in a few minutes. In this report, we provide an overview of the BERT framework, followed by a description of the source inversion technique. The Joint URBAN 2003 field experiment held in Oklahoma City that was used to validate BERT is then described. Subsequent sections describe the metrics used for evaluation, the comparison of the experimental data and BERT output, and under what conditions the BERT tool succeeds and performs poorly. Results are aggregated in different ways (e.g., daytime vs. nighttime releases, 1 vs. 2 vs. 3 hit collectors) to determine if BERT shows any systematic errors. Finally, recommendations are given for how to improve the code and procedures for optimizing performance in operational mode.
Torres-Verdín, Carlos
-filtrate invasion and formation test. A fully implicit finite- difference black-oil reservoir simulator with brine phenomena in porous media can be coupled through fluid saturation equations. Thus, a multi-physics inversion
seismic sur- veys. Results hint that the true value of time-lapse gravity as an additional tool and ongoing sensor technologies, combined with advances in computing power and robust inversion, can extract successful measure of fluid movement with time-lapse gravity experiments, although poorly documented
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,
Zhang, Hongchao
Assisted Seismic Matching: Joint Inversion of Seismic, Rock Physics and Basin Modeling Ulisses T physics, and seismic attributes, including seismic amplitude to match seismic data. Introduction a match to seismic data. In particular, we seek to match not just event timing (phase) but also reflection
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,...
% function dirfield2d % This program plots a direction field for an ODE x'=Ax, where A is % a 2x2 matrix, with the option of also plotting solution curves to % initial ...
Radiative heat transfer in 2D Dirac materials
Pablo Rodriguez-Lopez; Wang-Kong Tse; Diego A. R. Dalvit
2015-02-02T23:59:59.000Z
We compute the radiative heat transfer between two sheets of 2D Dirac materials, including topological Chern insulators and graphene, within the framework of the local approximation for the optical response of these materials. In this approximation, which neglects spatial dispersion, we derive both numerically and analytically the short-distance asymptotic of the near-field heat transfer in these systems, and show that it scales as the inverse of the distance between the two sheets. Finally, we discuss the limitations to the validity of this scaling law imposed by spatial dispersion in 2D Dirac materials.
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 ...
Constrained Inverse Volume Rendering for Planetary Nebulae Marcus Magnor
Utah, University of
Inverse Volume Rendering I.4.m [Image Processing and Computer Vision]: Miscellaneous--Volumetric Modeling that we are observing 2D projections of 3D volumes of glowing gas, the actual spatial struc- ture of PNeConstrained Inverse Volume Rendering for Planetary Nebulae Marcus Magnor MPI Informatik, Germany
Inverse Modeling for Coastal Seawater Intrusion
PolitÃ¨cnica de Catalunya, Universitat
, USA) #12;INTRODUCTION Â· Inverse modeling Â standard tool for groundwater modeling Â uncommonD3D.1 Â 2D and 3D finite-element code for simulating variable-density groundwater problems Â· UCODE 3 and given time (i.e. at one observation location) on one of the parameters in the groundwater model
Annotated Bibliography of EDGE2D Use
J.D. Strachan and G. Corrigan
2005-06-24T23:59:59.000Z
This annotated bibliography is intended to help EDGE2D users, and particularly new users, find existing published literature that has used EDGE2D. Our idea is that a person can find existing studies which may relate to his intended use, as well as gain ideas about other possible applications by scanning the attached tables.
Staring 2-D hadamard transform spectral imager
Gentry, Stephen M. (Albuquerque, NM); Wehlburg, Christine M. (Albuquerque, NM); Wehlburg, Joseph C. (Albuquerque, NM); Smith, Mark W. (Albuquerque, NM); Smith, Jody L. (Albuquerque, NM)
2006-02-07T23:59:59.000Z
A staring imaging system inputs a 2D spatial image containing multi-frequency spectral information. This image is encoded in one dimension of the image with a cyclic Hadamarid S-matrix. The resulting image is detecting with a spatial 2D detector; and a computer applies a Hadamard transform to recover the encoded image.
Finite Heat conduction in 2D Lattices
Lei Yang; Yang Kongqing
2001-07-30T23:59:59.000Z
This paper gives a 2D hamonic lattices model with missing bond defects, when the capacity ratio of defects is enough large, the temperature gradient can be formed and the finite heat conduction is found in the model. The defects in the 2D harmonic lattices impede the energy carriers free propagation, by another words, the mean free paths of the energy carrier are relatively short. The microscopic dynamics leads to the finite conduction in the model.
Thin films versus 2D sheets in layered structures: graphene and 2D metallic sheets
Bo E. Sernelius
2012-09-19T23:59:59.000Z
We study an interface between two media separated by a strictly 2D sheet. We show how the amplitude reflection coefficient can be modeled by that for an interface where the 2D sheet has been replaced by a film of small but finite thickness. We give the relationship between the 3D dielectric function of the thin film and the 2D dielectric function of the sheet. We choose graphene and a 2D metallic sheet as illustrative examples. This approach turns out to be very useful when treating graphene or graphene like sheets in non-planar structures
2D microwave imaging reflectometer electronics
Spear, A. G.; Domier, C. W., E-mail: cwdomier@ucdavis.edu; Hu, X.; Muscatello, C. M.; Ren, X.; Luhmann, N. C. [Electrical and Computer Engineering, University of California, Davis, California 95616 (United States); Tobias, B. J. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
2014-11-15T23:59:59.000Z
A 2D microwave imaging reflectometer system has been developed to visualize electron density fluctuations on the DIII-D tokamak. Simultaneously illuminated at four probe frequencies, large aperture optics image reflections from four density-dependent cutoff surfaces in the plasma over an extended region of the DIII-D plasma. Localized density fluctuations in the vicinity of the plasma cutoff surfaces modulate the plasma reflections, yielding a 2D image of electron density fluctuations. Details are presented of the receiver down conversion electronics that generate the in-phase (I) and quadrature (Q) reflectometer signals from which 2D density fluctuation data are obtained. Also presented are details on the control system and backplane used to manage the electronics as well as an introduction to the computer based control program.
Animation : 2D versus 3D and their combined effect
Au, Kristin C
2014-01-01T23:59:59.000Z
This thesis studies the differences in the perception of space and character movement between 2D and 3D animation. 2D animation is defined by elements constructed in a 2D environment while 3D animation by elements constructed ...
2-D color code quantum computation
Austin G. Fowler
2011-01-10T23:59:59.000Z
We describe in detail how to perform universal fault-tolerant quantum computation on a 2-D color code, making use of only nearest neighbor interactions. Three defects (holes) in the code are used to represent logical qubits. Triple defect logical qubits are deformed into isolated triangular sections of color code to enable transversal implementation of all single logical qubit Clifford group gates. CNOT is implemented between pairs of triple defect logical qubits via braiding.
GBL-2D Version 1.0: a 2D geometry boolean library.
McBride, Cory L. (Elemental Technologies, American Fort, UT); Schmidt, Rodney Cannon; Yarberry, Victor R.; Meyers, Ray J. (Elemental Technologies, American Fort, UT)
2006-11-01T23:59:59.000Z
This report describes version 1.0 of GBL-2D, a geometric Boolean library for 2D objects. The library is written in C++ and consists of a set of classes and routines. The classes primarily represent geometric data and relationships. Classes are provided for 2D points, lines, arcs, edge uses, loops, surfaces and mask sets. The routines contain algorithms for geometric Boolean operations and utility functions. Routines are provided that incorporate the Boolean operations: Union(OR), XOR, Intersection and Difference. A variety of additional analytical geometry routines and routines for importing and exporting the data in various file formats are also provided. The GBL-2D library was originally developed as a geometric modeling engine for use with a separate software tool, called SummitView [1], that manipulates the 2D mask sets created by designers of Micro-Electro-Mechanical Systems (MEMS). However, many other practical applications for this type of software can be envisioned because the need to perform 2D Boolean operations can arise in many contexts.
Duality between Spin networks and the 2D Ising model
Valentin Bonzom; Francesco Costantino; Etera R. Livine
2015-04-11T23:59:59.000Z
The goal of this paper is to exhibit a deep relation between the partition function of the Ising model on a planar trivalent graph and the generating series of the spin network evaluations on the same graph. We provide respectively a fermionic and a bosonic Gaussian integral formulation for each of these functions and we show that they are the inverse of each other (up to some explicit constants) by exhibiting a supersymmetry relating the two formulations. We investigate three aspects and applications of this duality. First, we propose higher order supersymmetric theories which couple the geometry of the spin networks to the Ising model and for which supersymmetric localization still holds. Secondly, after interpreting the generating function of spin network evaluations as the projection of a coherent state of loop quantum gravity onto the flat connection state, we find the probability distribution induced by that coherent state on the edge spins and study its stationary phase approximation. It is found that the stationary points correspond to the critical values of the couplings of the 2D Ising model, at least for isoradial graphs. Third, we analyze the mapping of the correlations of the Ising model to spin network observables, and describe the phase transition on those observables on the hexagonal lattice. This opens the door to many new possibilities, especially for the study of the coarse-graining and continuum limit of spin networks in the context of quantum gravity.
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
ENERGY LANDSCAPE OF 2D FLUID FORMS
Y. JIANG; ET AL
2000-04-01T23:59:59.000Z
The equilibrium states of 2D non-coarsening fluid foams, which consist of bubbles with fixed areas, correspond to local minima of the total perimeter. (1) The authors find an approximate value of the global minimum, and determine directly from an image how far a foam is from its ground state. (2) For (small) area disorder, small bubbles tend to sort inwards and large bubbles outwards. (3) Topological charges of the same sign repel while charges of opposite sign attract. (4) They discuss boundary conditions and the uniqueness of the pattern for fixed topology.
The practical application of 2D inversion to marine controlled-source electromagnetic data
Constable, Steve
to detect and im- age seafloor gas hydrates has also shown great potential Yuan and Edwards, 2000 forward driver. This code is demon- strated by inverting a CSEM data set collected at Hydrate Ridge
Using 2D inversion of magnetic resonance soundings to locate a water-filled karst conduit
the accuracy of the MRS results. Field hal-00120342,version1-14Dec2006 Author manuscript, published in "Journal governs the storage function in the karst aquifer. Each karst system is unique, and the geometry of its. Water-filled karst conduits can be located either by underground topographical survey
Pauli matrices and 2D electron gas
J. F. Geurdes
2013-02-07T23:59:59.000Z
In the present paper it will be argued that transport in a 2D electron gas can be implemented as 'local hidden instrument based' variables. With this concept of instrumentalism it is possible to explain the quantum correlation, the particle-wave duality and Wheeler's 'backward causation of a particle'. In the case of quantum correlation the spin measuring variant of the Einstein Podolsky and Rosen paradox is studied. In the case of particle-wave duality the system studied is single photon Mach-Zehnder (MZ) interferometry with a phase shift size $\\delta$. The idea that the instruments more or less neutrally may show us the way to the particle will be replaced by the concept of laboratory equipment contributing in an unexpected way to the measurement.
Universal 2D Soft Nano-Scale Mosaic Structure Theory for Polymers and Colloids
Jia-lin Wu
2011-05-25T23:59:59.000Z
A basic concept in chain-particle cluster-motion, from frozen glassy state to melt state, is the 2D soft nano-scale mosaic structure formed by 8 orders of 2D interface excitation (IE) loop-flows, from small to large in inverse cascade and re-arrangement structure in cascade along local one direction. IE has additional repulsive energy and extra vacancy volume. IE results from that the instantaneous synchronal polarized electron charge coupling pair is able to parallel transport on the interface between two neighboring chain-particles with antiparallel delocalization. This structure accords with de Gennes' mosaic structure picture, from which we can directly deduce glass transition temperature, melt temperature, free volume fraction, critical entangled chain length, and activation energy to break solid lattice. This is also the in-herency maximum order-potential structure in random systems.
2D Dirac Materials: From Graphene to Topological Insulators
Teweldebrhan, Desalegne Bekuretsion
2011-01-01T23:59:59.000Z
2D Topological Insulators. . . . . . . . . . . . . . . . .structure for a topological insulator. The Dirac cone fallsband structure for topological insulators. With the Fermi
A Planar Quantum Transistor Based on 2D-2D Tunneling in Double Quantum Well Heterostructures
Baca, W.E.; Blount, M.A.; Hafich, M.J.; Lyo, S.K.; Moon, J.S.; Reno, J.L.; Simmons, J.A.; Wendt, J.R.
1998-12-14T23:59:59.000Z
We report on our work on the double electron layer tunneling transistor (DELTT), based on the gate-control of two-dimensional -- two-dimensional (2D-2D) tunneling in a double quantum well heterostructure. While previous quantum transistors have typically required tiny laterally-defined features, by contrast the DELTT is entirely planar and can be reliably fabricated in large numbers. We use a novel epoxy-bond-and-stop-etch (EBASE) flip-chip process, whereby submicron gating on opposite sides of semiconductor epitaxial layers as thin as 0.24 microns can be achieved. Because both electron layers in the DELTT are 2D, the resonant tunneling features are unusually sharp, and can be easily modulated with one or more surface gates. We demonstrate DELTTs with peak-to-valley ratios in the source-drain I-V curve of order 20:1 below 1 K. Both the height and position of the resonant current peak can be controlled by gate voltage over a wide range. DELTTs with larger subband energy offsets ({approximately} 21 meV) exhibit characteristics that are nearly as good at 77 K, in good agreement with our theoretical calculations. Using these devices, we also demonstrate bistable memories operating at 77 K. Finally, we briefly discuss the prospects for room temperature operation, increases in gain, and high-speed.
Martovetsky, N N
2007-12-06T23:59:59.000Z
ITER Central Solenoid uses butt joints for connecting the pancakes in the CS module. The principles of the butt joining of the CICC were developed by the JAPT during CSMC project. The difference between the CSMC butt joint and the CS butt joint is that the CS butt joint is an in-line joint, while the CSMC is a double joint through a hairpin jumper. The CS butt joint has to carry the hoop load. The straight length of the joint is only 320 mm, and the vacuum chamber around the joint has to have a split in the clamp shell. These requirements are challenging. Fig.1 presents a CSMC joint, and Fig.2 shows a CS butt joint. The butt joint procedure was verified and demonstrated. The tool is capable of achieving all specified parameters. The vacuum in the end was a little higher than the target, which is not critical and readily correctable. We consider, tentatively that the procedure is established. Unexpectedly, we discover significant temperature nonuniformity in the joint cross section, which is not formally a violation of the specs, but is a point of concern. All testing parameters are recorded for QA purposes. We plan to modify the butt joining tool to improve its convenience of operation and provide all features necessary for production of butt joints by qualified personnel.
Stochastic Joint Inversion for Integrated Data Interpretation in Geothermal
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
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: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOriginEducationVideo Â»UsageSecretaryVideosSpringoutAPBF-DEC4: ProjectStephen M.P.Stewards
Risk Management Institute Joint Seminar Joint Seminar -
Chaudhuri, Sanjay
Risk Management Institute Joint Seminar Joint Seminar - Risk Management Institute And Department A (S14, #03-10) Speaker Prof. Wang Hefei University of Illinois, Chicago Title Leverage Management Abstract Leverage has often aggravated losses to managed investments. The recent collapses of hedge funds
2-D Coda and Direct Wave Attenuation Tomography in Northern Italy
Morasca, P; Mayeda, K; Gok, R; Phillips, W S; Malagnini, L
2007-10-17T23:59:59.000Z
A 1-D coda method was proposed by Mayeda et al. (2003) in order to obtain stable seismic source moment-rate spectra using narrowband coda envelope measurements. That study took advantage of the averaging nature of coda waves to derive stable amplitude measurements taking into account all propagation, site, and Sto-coda transfer function effects. Recently this methodology was applied to micro earthquake data sets from three sub-regions of northern Italy (i.e., western Alps, northern Apennines and eastern Alps). Since the study regions were small, ranging between local-to-near-regional distances, the simple 1-D path assumptions used in the coda method worked very well. The lateral complexity of this region would suggest, however, that a 2-D path correction might provide even better results if the datasets were combined, especially when paths traverse larger distances and complicated regions. The structural heterogeneity of northern Italy makes the region ideal to test the extent to which coda variance can be reduced further by using a 2-D Q tomography technique. The approach we use has been developed by Phillips et al. (2005) and is an extension of previous amplitude ratio techniques to remove source effects from the inversion. The method requires some assumptions such as isotropic source radiation which is generally true for coda waves. Our results are compared against direct Swave inversions for 1/Q and results from both share very similar attenuation features that coincide with known geologic structures. We compare our results with those derived from direct waves as well as some recent results from northern California obtained by Mayeda et al. (2005) which tested the same tomographic methodology applied in this study to invert for 1/Q. We find that 2-D coda path corrections for this region significantly improve upon the 1-D corrections, in contrast to California where only a marginal improvement was observed. We attribute this difference to stronger lateral variations in Q for northern Italy relative to California.
Office of Energy Efficiency and Renewable Energy (EERE)
The Joint Action Workshop is an annual event for joint action agencies and their members to meet informally and discuss emerging policy, regulatory, and power supply issues, and other topics...
2D Dirac Materials: From Graphene to Topological Insulators
Teweldebrhan, Desalegne Bekuretsion
2011-01-01T23:59:59.000Z
x Graphene Preparation and2008). Chapter 3 Graphene Preparation and CharacterizationPreparation Methods of Atomically-Thin 2D Graphene . . . . . . . . . . . . . . .
Lossless Wavelet Based Image Compression with Adaptive 2D Decomposition
Lossless Wavelet Based Image Compression with Adaptive 2D Decomposition Manfred Kopp Technical.kopp@ieee.org WWW: http://www.cg.tuwien.ac.at/~kopp/ Abstract 2D wavelets are usually generated from 1D wavelets wavelet functions based on the compression of the coefficients, but needs only the same number of 1D
Inverse hydrochemical models of aqueous extracts tests
Zheng, L.; Samper, J.; Montenegro, L.
2008-10-10T23:59:59.000Z
Aqueous extract test is a laboratory technique commonly used to measure the amount of soluble salts of a soil sample after adding a known mass of distilled water. Measured aqueous extract data have to be re-interpreted in order to infer porewater chemical composition of the sample because porewater chemistry changes significantly due to dilution and chemical reactions which take place during extraction. Here we present an inverse hydrochemical model to estimate porewater chemical composition from measured water content, aqueous extract, and mineralogical data. The model accounts for acid-base, redox, aqueous complexation, mineral dissolution/precipitation, gas dissolution/ex-solution, cation exchange and surface complexation reactions, of which are assumed to take place at local equilibrium. It has been solved with INVERSE-CORE{sup 2D} and been tested with bentonite samples taken from FEBEX (Full-scale Engineered Barrier EXperiment) in situ test. The inverse model reproduces most of the measured aqueous data except bicarbonate and provides an effective, flexible and comprehensive method to estimate porewater chemical composition of clays. Main uncertainties are related to kinetic calcite dissolution and variations in CO2(g) pressure.
Carlos Torres-Verdin; G. Michael Hoversten; Ki Ha Lee; Gregory Newman; Kurt Nihei
2008-12-31T23:59:59.000Z
This report summarizes the work performed between January 2005 and December 2007, under DOE research contract DE-FC26-04NT15507. The project is was performed by the Center for Petroleum and Geosystems Engineering of The University of Texas at Austin and Lawrence Berkeley National Laboratory under the auspices of the National Energy Technology Office (NETL) and the Strategic Center for Natural Gas and Oil (SCNGO). During the three-year project, we developed new methods to combine borehole sonic and electromagnetic (EM) measurements for the improved assessment of elastic and petrophysical properties of rock formations penetrated by a well. Sonic measurements consisted of full waveform acoustic amplitudes acquired with monopole and dipole sources, whereas EM measurements consisted of frequency-domain voltages acquired with multi-coil induction systems. The combination of sonic and EM measurements permitted the joint estimation of elastic and petrophysical properties in the presence of mud-filtrate invasion. It was conclusively shown that the combined interpretation of sonic and EM measurements reduced non-uniqueness in the estimation of elastic and petrophysical properties and improved the spatial resolution of the estimations compared to estimations yielded separately from the two types of measurements. Moreover, this approach enabled the assessment of dynamic petrophysical properties such as permeability, as it incorporated the physics of mud-filtrate invasion in the interpretation of the measurements. The first part of the project considered the development of fast and reliable numerical algorithms to simulate borehole sonic waveforms in 2D, 3D, and radial 1D media. Such algorithms were subsequently used in the quantitative estimation of elastic properties jointly from borehole sonic and EM measurements. In the second part of the project we developed a new algorithm to estimate water saturation, porosity, and dry-rock elastic moduli jointly from borehole sonic and EM measurements. This algorithm assumed radial 1D variations of fluid saturation due to mud-filtrate invasion. Subsequently, we adapted the estimation method to interpret borehole field measurements acquired in both a shaly-sand sedimentary sequence and a tight-gas sandstone formation. In the two cases, we simulated the process of mud-filtrate invasion and concomitantly honored sonic and EM measurements. We produced reliable estimates of permeability and dry-rock moduli that were successfully validated with rock-core measurements. Finally, we introduced a new stochastic inversion procedure to estimate elastic, electrical, and petrophysical properties of layered media jointly from waveform sonic and frequency-domain EM measurements. The procedure was based on Bayesian statistical inversion and delivered estimates of uncertainty under various forms of a-priori information about the unknown properties. Tests on realistic synthetic models confirmed the reliability of this procedure to estimate elastic and petrophysical properties jointly from sonic and EM measurements. Several extended abstracts and conference presentations stemmed from this project, including 2 SEG extended abstracts, 1 SPE extended abstract, and 2 SPWLA extended abstracts. Some of these extended abstracts have been submitted for publication in peer-reviewed journals.
Application of the 3D Edge Code EMC3-EIRENE to JET Single Null Configurations by Validating Against 2D Simulations with EDGE2D-EIRENE
Generation of high quality 2D meshes for given bathymetry
Colmenero, Jorge, S.B. Massachusetts Institute of Technology
2014-01-01T23:59:59.000Z
This thesis develops and applies a procedure to generate high quality 2D meshes for any given ocean region with complex coastlines. The different criteria used in determining mesh element sizes for a given domain are ...
3D-2D ASYMPTOTIC ANALYSIS FOR INHOMOGENEOUS THIN FILMS
3D-2D ASYMPTOTIC ANALYSIS FOR INHOMOGENEOUS THIN FILMS plate models, periodic pr* *o- files, and within the context of optimal design for thin films 5. Third application - Optimal design of a thin film 19 6. Final Remarks
Scheduling and 2D placement heuristics for partially reconfigurable systems
Santambrogio, Marco Domenico
This paper proposes new scheduling and 2D placement heuristics for partially dynamically reconfigurable systems. One specific focus of this work is to deal with applications containing hundreds of tasks grouped in a few ...
Solving the Capacitive Paradox of 2D MXene using Electrochemical...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
* DOI: 10.1002aenm.201400815 energy storage applications, such as bat- tery and supercapacitor electrodes. 4,5 These 2D materials are so labeled because, they are produced...
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
The Hanle Effect in 1D, 2D and 3D
R. Manso Sainz; J. Trujillo Bueno
2007-10-29T23:59:59.000Z
This paper addresses the problem of scattering line polarization and the Hanle effect in one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D) media for the case of a two-level model atom without lower-level polarization and assuming complete frequency redistribution. The theoretical framework chosen for its formulation is the QED theory of Landi Degl'Innocenti (1983), which specifies the excitation state of the atoms in terms of the irreducible tensor components of the atomic density matrix. The self-consistent values of these density-matrix elements is to be determined by solving jointly the kinetic and radiative transfer equations for the Stokes parameters. We show how to achieve this by generalizing to Non-LTE polarization transfer the Jacobi-based ALI method of Olson et al. (1986) and the iterative schemes based on Gauss-Seidel iteration of Trujillo Bueno and Fabiani Bendicho (1995). These methods essentially maintain the simplicity of the Lambda-iteration method, but their convergence rate is extremely high. Finally, some 1D and 2D model calculations are presented that illustrate the effect of horizontal atmospheric inhomogeneities on magnetic and non-magnetic resonance line polarization signals.
Performance of Replica-Exchange Wang-Landau Sampling for the 2D Ising Model: A Brief Survey
Zhao, Yiwei [Chinese University of Hong Kong (CUHK); Cheung, Siu Wun [Chinese University of Hong Kong (CUHK); Li, Ying Wai [ORNL; Eisenbach, Markus [ORNL
2014-01-01T23:59:59.000Z
We report a brief performance study of the replica-exchange Wang-Landau algorithm, a recently proposed parallel realization of Wang-Landau sampling, using the 2D Ising model as a test case. The simulation time is found to scale inversely with the square root of the number of subwindows (and thus number of processors) used to span the global parameter space. We also investigate the time profiles for random walkers in dierent subwindows to complete iterations, which will aid the development of and adaptive load-balancing scheme.
Structural and elastic properties of a confined 2D colloidal solid: a molecular dynamics study
M. Ebrahim Foulaadvand; Neda Ojaghlou
2014-09-27T23:59:59.000Z
We implement molecular dynamics simulations in canonical ensemble to study the effect of confinement on a $2d$ crystal of point particles interacting with an inverse power law potential proportional to $r^{-12}$ in a narrow channel. This system can describe colloidal particles at the air-water interface. It is shown that the system characteristics depend sensitively on the boundary conditions at the two {\\it walls} providing the confinement. The walls exert perpendicular forces on their adjacent particles. The potential between walls and particles varies as the inverse power of ten. Structural quantities such as density profile, structure factor and orientational order parameter are computed. It is shown that orientational order persists near the walls even at temperatures where the system in the bulk is in fluid state. The dependence of elastic constants, stress tensor elements, shear and bulk modulii on density as well as the channel width is discussed. Moreover, the effect of channel incommensurability with the triangular lattice structure is discussed. It is shown that incommensurability notably affects the system properties. We compare our findings to those obtained by Monte Carlo simulations and also to the case with the periodic boundary condition along the channel width. .
INVERSE PROTEIN FOLDING, HIERARCHICAL OPTIMISATION
Halligan, Daniel
INVERSE PROTEIN FOLDING, HIERARCHICAL OPTIMISATION AND TIE KNOTS Thomas M. A. Fink st. john Introduction 3 1.1 Inverse Protein Folding 3 1.2 Hierarchical Optimisation 5 1.3 Tie Knots 6 1.4 Schematic Organisation 6 1.5 Publications 9 2 Protein Folding, Inverse Protein Folding and Energy Landscapes 10 2
7, 1043910465, 2007 Mesoscale inversion
Boyer, Edmond
ACPD 7, 1043910465, 2007 Mesoscale inversion T. Lauvaux et al. Title Page Abstract Introduction Discussions Mesoscale inversion: first results from the CERES campaign with synthetic data T. Lauvaux 1,2 , M.lauvaux@lsce.ipsl.fr) 10439 #12;ACPD 7, 1043910465, 2007 Mesoscale inversion T. Lauvaux et al. Title Page Abstract
Robust inversion, dimensionality reduction, and randomized sampling
Aleksandr Aravkin
2011-11-17T23:59:59.000Z
Nov 17, 2011 ... Keywords: inverse problems, seismic inversion, stochastic optimization, robust estimation. Category 1: Nonlinear Optimization. Category 2: ...
Interlocked optimization and fast gradient algorithm for a seismic inverse problem
Metivier, Ludovic, E-mail: ludovic.metivier@gmail.com [LAGA, Universite Paris XIII, 99 Avenue Jean-Baptiste Clement, 93000 Epinay-Villetaneuse (France)
2011-08-10T23:59:59.000Z
Highlights: {yields} A 2D extension of the 1D nonlinear inversion of well-seismic data is given. {yields} Appropriate regularization yields a well-determined large scale inverse problem. {yields} An interlocked optimization loop acts as an efficient preconditioner. {yields} The adjoint state method is used to compute the misfit function gradient. {yields} Domain decomposition method yields an efficient parallel implementation. - Abstract: We give a nonlinear inverse method for seismic data recorded in a well from sources at several offsets from the borehole in a 2D acoustic framework. Given the velocity field, approximate values of the impedance are recovered. This is a 2D extension of the 1D inversion of vertical seismic profiles . The inverse problem generates a large scale undetermined ill-conditioned problem. Appropriate regularization terms render the problem well-determined. An interlocked optimization algorithm yields an efficient preconditioning. A gradient algorithm based on the adjoint state method and domain decomposition gives a fast parallel numerical method. For a realistic test case, convergence is attained in an acceptable time with 128 processors.
Quantum Process Tomography by 2D Fluorescence Spectroscopy
Leonardo A. Pachon; Andrew H. Marcus; Alan Aspuru-Guzik
2015-02-09T23:59:59.000Z
Reconstruction of the dynamics (quantum process tomography) of the single-exciton manifold in energy transfer systems is proposed here on the basis of two-dimensional fluorescence spectroscopy (2D-FS) with phase-modulation. The quantum-process-tomography protocol introduced here benefits from, e.g., the sensitivity enhancement and signal-to-noise ratio ascribed to 2D-FS. Although the isotropically averaged spectroscopic signals depend on the quantum yield parameter $\\Gamma$ of the doubly-excited-exciton manifold, it is shown that the reconstruction of the dynamics is insensitive to this parameter. Applications to foundational and applied problems, as well as further extensions, are discussed.
Quantum Process Tomography by 2D Fluorescence Spectroscopy
Pachon, Leonardo A; Aspuru-Guzik, Alan
2015-01-01T23:59:59.000Z
Reconstruction of the dynamics (quantum process tomography) of the single-exciton manifold in energy transfer systems is proposed here on the basis of two-dimensional fluorescence spectroscopy (2D-FS) with phase-modulation. The quantum-process-tomography protocol introduced here benefits from, e.g., the sensitivity enhancement and signal-to-noise ratio ascribed to 2D-FS. Although the isotropically averaged spectroscopic signals depend on the quantum yield parameter $\\Gamma$ of the doubly-excited-exciton manifold, it is shown that the reconstruction of the dynamics is insensitive to this parameter. Applications to foundational and applied problems, as well as further extensions, are discussed.
Characterization of 3d topological insulators by 2d invariants
Rahul Roy
2010-04-20T23:59:59.000Z
The prediction of non-trivial topological phases in Bloch insulators in three dimensions has recently been experimentally verified. Here, I provide a picture for obtaining the $Z_{2}$ invariants for a three dimensional topological insulator by deforming suitable 2d planes in momentum space and by using a formula for the 2d $Z_{2}$ invariant based on the Chern number. The physical interpretation of this formula is also clarified through the connection between this formulation of the $Z_{2}$ invariant and the quantization of spin Hall conductance in two dimensions.
Finite temperature analysis of a quasi2D dipolar gas
Ticknor, Christopher
2012-01-01T23:59:59.000Z
We present finite temperature analysis of a quasi2D dipolar gas. To do this, we use the Hartree Fock Bogoliubov method within the Popov approximation. This formalism is a set of non-local equations containing the dipole-dipole interaction and the condensate and thermal correlation functions, which are solved self-consistently. We detail the numerical method used to implement the scheme. We present density profiles for a finite temperature dipolar gas in quasi2D, and compare these results to a gas with zero-range interactions. Additionally, we analyze the excitation spectrum and study the impact of the thermal exchange.
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
Ward, Michael E. (Poway, CA); Harkins, Bruce D. (San Diego, CA)
1993-01-01T23:59:59.000Z
Many recuperators have components which react to corrosive gases and are used in applications where the donor fluid includes highly corrosive gases. These recuperators have suffered reduced life, increased service or maintenance, and resulted in increased cost. The present joint when used with recuperators increases the use of ceramic components which do not react to highly corrosive gases. Thus, the present joint used with the present recuperator increases the life, reduces the service and maintenance, and reduces the increased cost associated with corrosive action of components used to manufacture recuperators. The present joint is comprised of a first ceramic member, a second ceramic member, a mechanical locking device having a groove defined in one of the first ceramic member and the second ceramic member. The joint and the mechanical locking device is further comprised of a refractory material disposed in the groove and contacting the first ceramic member and the second ceramic member. The present joint mechanically provides a high strength load bearing joint having good thermal cycling characteristics, good resistance to a corrosive environment and good steady state strength at elevated temperatures.
Ward, M.E.; Harkins, B.D.
1993-11-30T23:59:59.000Z
Many recuperators have components which react to corrosive gases and are used in applications where the donor fluid includes highly corrosive gases. These recuperators have suffered reduced life, increased service or maintenance, and resulted in increased cost. The present joint when used with recuperators increases the use of ceramic components which do not react to highly corrosive gases. Thus, the present joint used with the present recuperator increases the life, reduces the service and maintenance, and reduces the increased cost associated with corrosive action of components used to manufacture recuperators. The present joint is comprised of a first ceramic member, a second ceramic member, a mechanical locking device having a groove defined in one of the first ceramic member and the second ceramic member. The joint and the mechanical locking device is further comprised of a refractory material disposed in the groove and contacting the first ceramic member and the second ceramic member. The present joint mechanically provides a high strength load bearing joint having good thermal cycling characteristics, good resistance to a corrosive environment and good steady state strength at elevated temperatures. 4 figures.
2D Static Light Scattering for Dairy Based Applications
2D Static Light Scattering for Dairy Based Applications Jacob Lercke Skytte Kongens Lyngby 2014 Ph information on the microstructure. The second paper makes a direction comparison between the light scattering a recently introduced light scattering tech- nique. The system setup of the technique is highly flexible
Universal topological phase of 2D stabilizer codes
H. Bombin; Guillaume Duclos-Cianci; David Poulin
2011-03-23T23:59:59.000Z
Two topological phases are equivalent if they are connected by a local unitary transformation. In this sense, classifying topological phases amounts to classifying long-range entanglement patterns. We show that all 2D topological stabilizer codes are equivalent to several copies of one universal phase: Kitaev's topological code. Error correction benefits from the corresponding local mappings.
EU Guide v 2d January 20141 Finance Division
de Gispert, Adrià
EU Guide v 2d January 20141 Finance Division Procurement Services The EU Directives on Public purchasing practice and especially where funders require it as part of their grant conditions. In exceptional Andrew Reid (goods and services) or the Director of Estate Management and Building Services (property
3D-2D ASYMPTOTIC ANALYSIS FOR MICROMAGNETIC THIN FILMS
3D-2D ASYMPTOTIC ANALYSIS FOR MICROMAGNETIC THIN FILMS Classification: 35E99, 35M10, 49J45, 74K35. Keywords: -limit, thin films, micromagnetics, relaxation; 1 1. Introduction In recent years the understanding of thin film behavior has been helped
H_2D^+: a light on baryonic dark matter?
Cecilia Ceccarelli; Carsten Dominik
2006-02-27T23:59:59.000Z
It has been suggested that the dark halos of galaxies are constituted by cloudlets of cold ( 10^7$ cm^{-3}) molecular gas. Such gas is extremely difficult to detect, because the classical tracers of molecular gas, CO and/or dust grains, have very low abundances and their emission is exceedingly weak. For this reason, the cloudlet hypothesis remains so far substantially unproven. In this Letter we propose a new method to probe the presence of cold H_2 clouds in galactic halos: the ground transition of ortho-H_2D^+ at 372 GHz. We discuss why the H_2D^+ is abundant under the physical conditions appropriate for the cloudlets, and present a chemical model that predicts the H_2D^+ abundance as function of four key parameters: gas density and metallicity, cosmic ray ionization rate and dust grain size. We conclude that current ground-based instruments might detect the ortho-H_2D^+ line emitted by the cloudlets halo, and prove, therefore, the existence of large quantities of dark baryonic matter around galaxies.
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItem NotEnergy,ARMForms About Batteriesmetal-organic frameworks EFRC 1001 wordInverse
Inverse problem for Bremsstrahlung radiation
Voss, K.E.; Fisch, N.J.
1991-10-01T23:59:59.000Z
For certain predominantly one-dimensional distribution functions, an analytic inversion has been found which yields the velocity distribution of superthermal electrons given their Bremsstrahlung radiation. 5 refs.
Inverse Problems in Transport Theory
The inverse scattering problem for (2.1) is the following: Does S determine ...... J. Voigt, Spectral properties of the neutron transport equation, J. Math. Anal. Appl.
Torres-Verdín, Carlos
decomposition. Examples of application with synthetic data sets show that the new method is computer efficient are invariably affected by borehole, mud-filtrate invasion, bed thickness, and other environ- mental effects even
2-D linear motion system. Innovative technology summary report
NONE
1998-11-01T23:59:59.000Z
The US Department of Energy's (DOE's) nuclear facility decontamination and decommissioning (D and D) program requires buildings to be decontaminated, decommissioned, and surveyed for radiological contamination in an expeditious and cost-effective manner. Simultaneously, the health and safety of personnel involved in the D and D activities is of primary concern. D and D workers must perform duties high off the ground, requiring the use of manlifts or scaffolding, often, in radiologically or chemically contaminated areas or in areas with limited access. Survey and decontamination instruments that are used are sometimes heavy or awkward to use, particularly when the worker is operating from a manlift or scaffolding. Finding alternative methods of performing such work on manlifts or scaffolding is important. The 2-D Linear Motion System (2-D LMS), also known as the Wall Walker{trademark}, is designed to remotely position tools and instruments on walls for use in such activities as radiation surveys, decontamination, and painting. Traditional (baseline) methods for operating equipment for these tasks require workers to perform duties on elevated platforms, sometimes several meters above the ground surface and near potential sources of contamination. The Wall Walker 2-D LMS significantly improves health and safety conditions by facilitating remote operation of equipment. The Wall Walker 2-D LMS performed well in a demonstration of its precision, accuracy, maneuverability, payload capacity, and ease of use. Thus, this innovative technology is demonstrated to be a viable alternative to standard methods of performing work on large, high walls, especially those that have potential contamination concerns. The Wall Walker was used to perform a final release radiological survey on over 167 m{sup 2} of walls. In this application, surveying using a traditional (baseline) method that employs an aerial lift for manual access was 64% of the total cost of the improved technology. However, for areas over approximately 600 m{sup 2}, the Wall Walker would cost less than the baseline. Using the Wall Walker 2-D LMS, ALARA exposure and worker safety is improved, and there is potential for increased productivity. This innovative technology performed better than the baseline by providing real-time monitoring of the tool or instrument position. Also, the Wall Walker 2-D LMS can traverse any two-dimensional path at constant speeds of up to 18.3 linear meters per minute (60 linear feet per minute). The survey production rate for the innovative technology was about 0.6 m{sup 2}/min (6 ft{sup 2}/min); the baseline production rate was approximately 0.3 m{sup 2}/min (3 ft{sup 2}/min), using the same surveying instrument and maximum scanning rate.
ESSDERC, Bucharest, Sep. 19, 2013.Kaustav Banerjee, UCSB 2D Electronics: Graphene and Beyond
Liebling, Michael
ESSDERC, Bucharest, Sep. 19, 2013.Kaustav Banerjee, UCSB 2D Electronics: Graphene and Beyond Electronics? I will use 2D electronic materials: Graphene and Beyond #12;ESSDERC, Bucharest, Sep. 19, 2013.Kaustav Banerjee, UCSB 2D Electronic Materials 2D family tree TMD family Graphene family Other families
Predictability of the energy cascade in 2D turbulence
G. Boffetta; S. Musacchio
2000-06-09T23:59:59.000Z
The predictability problem in the inverse energy cascade of two-dimensional turbulence is addressed by means of direct numerical simulations. The growth rate as a function of the error level is determined by means of a finite size extension of the Lyapunov exponent. For error within the inertial range, the linear growth of the error energy, predicted by dimensional argument, is verified with great accuracy. Our numerical findings are in close agreement with the result of TFM closure approximation.
Rolling contact orthopaedic joint design
Slocum, Alexander Henry, Jr
2013-01-01T23:59:59.000Z
Arthroplasty, the practice of rebuilding diseased biological joints using engineering materials, is often used to treat severe arthritis of the knee and hip. Prosthetic joints have been created in a "biomimetic" manner to ...
Longevity of Duct Tape in Residential Air Distribution Systems: 1-D, 2-D, and 3-D Joints
Abushakra, B.
2003-01-01T23:59:59.000Z
before being leakage tested. 0.230 0.240 0.250 0.260 0.270 0.280 0.290 0.300 0.310 11:10 11:25 11:40 11:55 12:10 12:25 Time (hr:min) L eakg e F l o w Rate (cfm@ 25Pa) Sample S1105 cooling down from 200F (93?C) to room temprature 77F (25?C). Room... of the resolution of the leakage tests and other issues, such as the changes due to temperature of the test sample during leakage testing (discussed earlier). For example, for the most recent tests, we waited until the samples were cool before testing, which...
Beam-Plasma Instabilities in a 2D Yukawa Lattice
Kyrkos, S. [Department of Chemistry and Physics, Le Moyne College, Syracuse, New York 13214 (United States); Kalman, G. J. [Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467 (United States); Rosenberg, M. [Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, California 92093 (United States)
2009-06-05T23:59:59.000Z
We consider a 2D Yukawa lattice of grains, with a beam of other charged grains moving in the lattice plane. In contrast to Vlasov plasmas, where the electrostatic instability excited by the beam is only longitudinal, here both longitudinal and transverse instabilities of the lattice phonons can develop. We determine and compare the transverse and longitudinal growth rates. The growth rate spectrum in wave number space exhibits remarkable gaps where no instability can develop. Depending on the system parameters, the transverse instability can be selectively excited.
Exact solutions for the 2d one component plasma
Timothy D. Andersen
2013-02-13T23:59:59.000Z
The 2d one component gas of pointlike charges in a uniform neutralizing background interacting with a logarithmic potential is a common model for plasmas. In its classical equilibrium statistics at fixed temperature (canonical ensemble) it is formally related to certain types of random matrices with Gaussian distribution and complex eigenvalues. In this paper, I present an exact integration of this ensemble for $N$ such particles (or alternatively $N\\times N$ matrices) for all even non-negative temperatures, a significant open problem in statistical physics for several decades. I achieve this exact integration via an exact integration of a related ensemble, the two-dimensional Selberg integral.
Black liquor gasification phase 2D final report
Kohl, A.L.; Stewart, A.E.
1988-06-01T23:59:59.000Z
This report covers work conducted by Rockwell International under Amendment 5 to Subcontract STR/DOE-12 of Cooperative Agreement DE-AC-05-80CS40341 between St. Regis Corporation (now Champion International) and the Department of Energy (DOE). The work has been designated Phase 2D of the overall program to differentiate it from prior work under the same subcontract. The overall program is aimed at demonstrating the feasibility of and providing design data for the Rockwell process for gasifying Kraft black liquor. In this process, concentrated black liquor is converted into low-Btu fuel gas and reduced melt by reaction with air in a specially designed gasification reactor.
Transport Experiments on 2D Correlated Electron Physics in Semiconductors
Tsui, Daniel
2014-03-24T23:59:59.000Z
This research project was designed to investigate experimentally the transport properties of the 2D electrons in Si and GaAs, two prototype semiconductors, in several new physical regimes that were previously inaccessible to experiments. The research focused on the strongly correlated electron physics in the dilute density limit, where the electron potential energy to kinetic energy ratio rs>>1, and on the fractional quantum Hall effect related physics in nuclear demagnetization refrigerator temperature range on samples with new levels of purity and controlled random disorder.
3D rotational diffusion microrheology using 2D video microscopy
Rémy Colin; Minhao Yan; Loudjy Chevry; Jean-François Berret; Bérengère Abou
2012-01-05T23:59:59.000Z
We propose a simple way to perform three-dimensional (3D) rotational microrheology using two-dimensional (2D) video microscopy. The 3D rotational brownian motion of micrometric wires in a viscous fluid is deduced from their projection on the focal plane of an optical microscope objective. The rotational diffusion coefficient of the wires of length between 1-100 \\mu m is extracted, as well as their diameter distribution in good agreement with electron microscopy measurements. This is a promising way to characterize soft visco-elastic materials, and probe the dimensions of anisotropic objects.
2D spectroscopy of double-barred galaxies
A. V. Moiseev; J. R. Valdes; V. H. Chavushyan
2002-02-13T23:59:59.000Z
The first results of the observational program of the study of 2D-kinematics in double-barred galaxies are presented. We show that, for the main part of the sample, the inner bars do not affect the circumnuclear stellar kinematics. Therefore, they are not dynamically decoupled structures. Various types of non-circular gas motion were found in many galaxies. The analysis of the ground-based and HST optical and NIR images reveals mini-spirals in about half of the investigated objects. We suggest that so called ``double-barred galaxies'' are, in fact, galaxies with very different circumnuclear structure.
SPIDERS Joint Capability Technology Demonstration Industry Day...
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SPIDERS Joint Capability Technology Demonstration Industry Day Presentations SPIDERS Joint Capability Technology Demonstration Industry Day Presentations Presentations from the...
2D kinematic signatures of boxy/peanut bulges
Iannuzzi, Francesca
2015-01-01T23:59:59.000Z
We study the imprints of boxy/peanut structures on the 2D line-of-sight kinematics of simulated disk galaxies. The models under study belong to a family with varying initial gas fraction and halo triaxiality, plus few other control runs with different structural parameters; the kinematic information was extracted using the Voronoi-binning technique and parametrised up to the fourth order of a Gauss-Hermite series. Building on a previous work for the long-slit case, we investigate the 2D kinematic behaviour in the edge-on projection as a function of the boxy/peanut strength and position angle; we find that for the strongest structures the highest moments show characteristic features away from the midplane in a range of position angles. We also discuss the masking effect of a classical bulge and the ambiguity in discriminating kinematically this spherically-symmetric component from a boxy/peanut bulge seen end-on. Regarding the face-on case, we extend existing results to encompass the effect of a second bucklin...
MESH2D GRID GENERATOR DESIGN AND USE
Flach, G.; Smith, F.
2012-01-20T23:59:59.000Z
Mesh2d is a Fortran90 program designed to generate two-dimensional structured grids of the form [x(i),y(i,j)] where [x,y] are grid coordinates identified by indices (i,j). The x(i) coordinates alone can be used to specify a one-dimensional grid. Because the x-coordinates vary only with the i index, a two-dimensional grid is composed in part of straight vertical lines. However, the nominally horizontal y(i,j{sub 0}) coordinates along index i are permitted to undulate or otherwise vary. Mesh2d also assigns an integer material type to each grid cell, mtyp(i,j), in a user-specified manner. The complete grid is specified through three separate input files defining the x(i), y(i,j), and mtyp(i,j) variations. The overall mesh is constructed from grid zones that are typically then subdivided into a collection of smaller grid cells. The grid zones usually correspond to distinct materials or larger-scale geometric shapes. The structured grid zones are identified through uppercase indices (I,J). Subdivision of zonal regions into grid cells can be done uniformly, or nonuniformly using either a polynomial or geometric skewing algorithm. Grid cells may be concentrated backward, forward, or toward both ends. Figure 1 illustrates the above concepts in the context of a simple four zone grid.
Laboratory characterization of rock joints
Hsiung, S.M.; Kana, D.D.; Ahola, M.P.; Chowdhury, A.H.; Ghosh, A. [Southwest Research Inst., San Antonio, TX (United States). Center for Nuclear Waste Regulatory Analyses
1994-05-01T23:59:59.000Z
A laboratory characterization of the Apache Leap tuff joints under cyclic pseudostatic and dynamic loads has been undertaken to obtain a better understanding of dynamic joint shear behavior and to generate a complete data set that can be used for validation of existing rock-joint models. Study has indicated that available methods for determining joint roughness coefficient (JRC) significantly underestimate the roughness coefficient of the Apache Leap tuff joints, that will lead to an underestimation of the joint shear strength. The results of the direct shear tests have indicated that both under cyclic pseudostatic and dynamic loadings the joint resistance upon reverse shearing is smaller than that of forward shearing and the joint dilation resulting from forward shearing recovers during reverse shearing. Within the range of variation of shearing velocity used in these tests, the shearing velocity effect on rock-joint behavior seems to be minor, and no noticeable effect on the peak joint shear strength and the joint shear strength for the reverse shearing is observed.
Interactive initialization of 2D/3D rigid registration
Gong, Ren Hui; Güler, Özgür [The Sheikh Zayed Institute for Pediatric Surgical Innovation, Children's National Medical Center, Washington, DC 20010 (United States)] [The Sheikh Zayed Institute for Pediatric Surgical Innovation, Children's National Medical Center, Washington, DC 20010 (United States); Kürklüoglu, Mustafa [Department of Cardiac Surgery, Children's National Medical Center, Washington, DC 20010 (United States)] [Department of Cardiac Surgery, Children's National Medical Center, Washington, DC 20010 (United States); Lovejoy, John [Department of Orthopaedic Surgery and Sports Medicine, Children's National Medical Center, Washington, DC 20010 (United States)] [Department of Orthopaedic Surgery and Sports Medicine, Children's National Medical Center, Washington, DC 20010 (United States); Yaniv, Ziv, E-mail: ZYaniv@childrensnational.org [The Sheikh Zayed Institute for Pediatric Surgical Innovation, Children's National Medical Center, Washington, DC 20010 and Departments of Pediatrics and Radiology, George Washington University, Washington, DC 20037 (United States)] [The Sheikh Zayed Institute for Pediatric Surgical Innovation, Children's National Medical Center, Washington, DC 20010 and Departments of Pediatrics and Radiology, George Washington University, Washington, DC 20037 (United States)
2013-12-15T23:59:59.000Z
Purpose: Registration is one of the key technical components in an image-guided navigation system. A large number of 2D/3D registration algorithms have been previously proposed, but have not been able to transition into clinical practice. The authors identify the primary reason for the lack of adoption with the prerequisite for a sufficiently accurate initial transformation, mean target registration error of about 10 mm or less. In this paper, the authors present two interactive initialization approaches that provide the desired accuracy for x-ray/MR and x-ray/CT registration in the operating room setting. Methods: The authors have developed two interactive registration methods based on visual alignment of a preoperative image, MR, or CT to intraoperative x-rays. In the first approach, the operator uses a gesture based interface to align a volume rendering of the preoperative image to multiple x-rays. The second approach uses a tracked tool available as part of a navigation system. Preoperatively, a virtual replica of the tool is positioned next to the anatomical structures visible in the volumetric data. Intraoperatively, the physical tool is positioned in a similar manner and subsequently used to align a volume rendering to the x-ray images using an augmented reality (AR) approach. Both methods were assessed using three publicly available reference data sets for 2D/3D registration evaluation. Results: In the authors' experiments, the authors show that for x-ray/MR registration, the gesture based method resulted in a mean target registration error (mTRE) of 9.3 ± 5.0 mm with an average interaction time of 146.3 ± 73.0 s, and the AR-based method had mTREs of 7.2 ± 3.2 mm with interaction times of 44 ± 32 s. For x-ray/CT registration, the gesture based method resulted in a mTRE of 7.4 ± 5.0 mm with an average interaction time of 132.1 ± 66.4 s, and the AR-based method had mTREs of 8.3 ± 5.0 mm with interaction times of 58 ± 52 s. Conclusions: Based on the authors' evaluation, the authors conclude that the registration approaches are sufficiently accurate for initializing 2D/3D registration in the OR setting, both when a tracking system is not in use (gesture based approach), and when a tracking system is already in use (AR based approach)
areaDetector: Software for 2-D Detectors in EPICS
Rivers, M. (UC)
2011-09-23T23:59:59.000Z
areaDetector is a new EPICS module designed to support 2-D detectors. It is modular C++ code that greatly simplifies the task of writing support for a new detector. It also supports plugins, which receive detector data from the driver and process it in some way. Existing plugins perform Region-Of-Interest extraction and analysis, file saving (in netCDF, HDF, TIFF and JPEG formats), color conversion, and export to EPICS records for image display in clients like ImageJ and IDL. Drivers have now been written for many of the detectors commonly used at synchrotron beamlines, including CCDs, pixel array and amorphous silicon detectors, and online image plates.
Electrical spin injection in 2D semiconductors and topological insulators
Golub, L. E.; Ivchenko, E. L. [Ioffe Physical-Technical Institute of the Russian Academy of Sciences, St. Petersburg (Russian Federation)
2013-12-04T23:59:59.000Z
We have developed a theory of spin orientation by electric current in 2D semiconductors. It is shown that the spin depends on the relation between the energy and spin relaxation times and can vary by a factor of two for the limiting cases of fast and slow energy relaxation. For symmetrically-doped (110)-grown semiconductor quantum wells the effect of current-induced spin orientation is shown to exist due to random spatial variation of the Rashba spin-orbit splitting. We demonstrate that the spin depends strongly on the correlation length of this random spin-orbit field. We calculate the spin orientation degree in two-dimensional topological insulators. In high electric fields when the “streaming” regime is realized, the spin orientation degree weakly depends on the electric field and can reach values about 5%.
HEXAGONAL ARRAY STRUCTURE FOR 2D NDE APPLICATIONS
Dziewierz, J.; Ramadas, S. N.; Gachagan, A.; O'Leary, R. L. [Centre for Ultrasonic Engineering, Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, G1 1XW (United Kingdom)
2010-02-22T23:59:59.000Z
This paper describes a combination of simulation and experimentation to evaluate the advantages offered by utilizing a hexagonal shaped array element in a 2D NDE array structure. The active material is a 1-3 connectivity piezoelectric composite structure incorporating triangular shaped pillars--each hexagonal array element comprising six triangular pillars. A combination of PZFlex, COMSOL and Matlab has been used to simulate the behavior of this device microstructure, for operation around 2.25 MHz, with unimodal behavior and low levels of mechanical cross-coupling predicted. Furthermore, the application of hexagonal array elements enables the array aperture to increase by approximately 30%, compared to a conventional orthogonal array matrix and hence will provide enhanced volumetric coverage and SNR. Prototype array configurations demonstrate good corroboration of the theoretically predicted mechanical cross-coupling between adjacent array elements (approx23 dB).
The 2d International Symposium on Computational Geomechanics (ComGeo II) 1 INTRODUCTION
Boyer, Edmond
The 2d International Symposium on Computational Geomechanics (ComGeo II) 1 1 INTRODUCTION Last at the contacts is studied. #12;The 2d International Symposium on Computational Geomechanics (ComGeo II) 2 complex
Optical 2-D Scanning System for Laser - Generated Shockwave Treatment of Wound Infections
Patel, Shahzad Neville
2013-01-01T23:59:59.000Z
biofilm structure from confocal scanning laser microscopyAngeles Optical 2-D Scanning System for Laser - GeneratedTHE THESIS Optical 2-D Scanning System for Laser-Generated
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron beamJoin HERO Mariners vs.Joint Environmental User
Lasecki, John V. (Livonia, MI); Novak, Robert F. (Farmington Hills, MI); McBride, James R. (Ypsilanti, MI)
1991-01-01T23:59:59.000Z
A metal to ceramic sealed joint which can withstand wide variations in temperature and maintain a good seal is provided for use in a device adapted to withstand thermal cycling from about 20 to about 1000 degrees C. The sealed joint includes a metal member, a ceramic member having an end portion, and an active metal braze forming a joint to seal the metal member to the ceramic member. The joint is positioned remote from the end portion of the ceramic member to avoid stresses at the ends or edges of the ceramic member. The sealed joint is particularly suited for use to form sealed metal to ceramic joints in a thermoelectric generator such as a sodium heat engine where a solid ceramic electrolyte is joined to metal parts in the system.
Lasecki, J.V.; Novak, R.F.; McBride, J.R.
1991-08-27T23:59:59.000Z
A metal to ceramic sealed joint which can withstand wide variations in temperature and maintain a good seal is provided for use in a device adapted to withstand thermal cycling from about 20 to about 1000 degrees C. The sealed joint includes a metal member, a ceramic member having an end portion, and an active metal braze forming a joint to seal the metal member to the ceramic member. The joint is positioned remote from the end portion of the ceramic member to avoid stresses at the ends or edges of the ceramic member. The sealed joint is particularly suited for use to form sealed metal to ceramic joints in a thermoelectric generator such as a sodium heat engine where a solid ceramic electrolyte is joined to metal parts in the system. 11 figures.
2D-GE IMAGE SEGMENTATION BASED ON LEVEL-SETS E.A. Mylona a
Athens, University of
2D-GE IMAGE SEGMENTATION BASED ON LEVEL-SETS E.A. Mylona a , M.A. Savelonas a , D. Maroulis a , M of protein spots in 2D-GE images. The proposed scheme incorporates a protein spot detection stage based both software packages in terms of segmentation performance. Index Terms--2D-GE Images, Protein Spot
An Improved Ant Colony Optimisation Algorithm for the 2D HP Protein Folding Problem
Hoos, Holger H.
An Improved Ant Colony Optimisation Algorithm for the 2D HP Protein Folding Problem Alena hydrophobic-polar (2D HP) protein folding problem. We present an improved version of our recently proposed Ant search. Overall, the results presented here establish our new ACO algorithm for 2D HP protein folding
An Ant Colony Optimization Algorithm for the 2D HP Protein Folding Problem
Hoos, Holger H.
An Ant Colony Optimization Algorithm for the 2D HP Protein Folding Problem Alena Shmygelska, Rosal, the two dimensional hydrophobic-polar (2D HP) protein folding problem. We introduce an ant colony algorithm closely approaches that of specialised, state-of-the methods for 2D HP protein folding. 1
Cylindrical 2D ALE simulations of laser interactions with flyer targets
Kurien, Susan
, mass density, v speed, p pressure, e specific internal energy, T temperature, heat conductivity acceleration simulated in 2D. 2 Numerical ALE method with extensions Our 2D ALE code [6] employs conservative 1 April 2006 We have developed 2D Arbitrary Lagrangian Eulerian (ALE) code in the cylindrical r - z
Joint Center for Artificial Photosynthesis
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The Joint Center for Artificial Photosynthesis (JCAP) is the nation's largest research program dedicated to the development of an artificial solar-fuel generation technology....
Biofluid lubrication for artificial joints
Pendelton, Alice Mae
2009-05-15T23:59:59.000Z
This research investigated biofluid lubrication related to artificial joints using tribological and rheological approaches. Biofluids studied here represent two categories of fluids, base fluids and nanostructured biofluids. ...
JOINT ELECTRICAL & COMPUTER ENGINEERING AND
JOINT ELECTRICAL & COMPUTER ENGINEERING AND APPLIED MATH SEMINAR "Imaging Science Meets Compressed, and electrical engineering. It surprisingly predicts that high-dimensional signals, which allow a sparse
Joint Center for Artificial Photosynthesis
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JCAP North JCAP Headquarters Joint Center for Artificial Photosynthesis California Institute of Technology Jorgensen Laboratory, Mail Code 132-80 1200 East California Boulevard...
Jointly Sponsored Research Program
Everett A. Sondreal; John G. Hendrikson; Thomas A. Erickson
2009-03-31T23:59:59.000Z
U.S. Department of Energy (DOE) Cooperative Agreement DE-FC26-98FT40321 funded through the Office of Fossil Energy and administered at the National Energy Technology Laboratory (NETL) supported the performance of a Jointly Sponsored Research Program (JSRP) at the Energy & Environmental Research Center (EERC) with a minimum 50% nonfederal cost share to assist industry in commercializing and effectively applying highly efficient, nonpolluting energy systems that meet the nation's requirements for clean fuels, chemicals, and electricity in the 21st century. The EERC in partnership with its nonfederal partners jointly performed 131 JSRP projects for which the total DOE cost share was $22,716,634 (38%) and the nonfederal share was $36,776,573 (62%). Summaries of these projects are presented in this report for six program areas: (1) resource characterization and waste management, (2) air quality assessment and control, (3) advanced power systems, (4) advanced fuel forms, (5) value-added coproducts, and (6) advanced materials. The work performed under this agreement addressed DOE goals for reductions in CO{sub 2} emissions through efficiency, capture, and sequestration; near-zero emissions from highly efficient coal-fired power plants; environmental control capabilities for SO{sub 2}, NO{sub x}, fine respirable particulate (PM{sub 2.5}), and mercury; alternative transportation fuels including liquid synfuels and hydrogen; and synergistic integration of fossil and renewable resources.
Inversion of the star transform
Fan Zhao; John C. Schotland; Vadim A. Markel
2014-05-06T23:59:59.000Z
We define the star transform as a generalization of the broken ray transform introduced by us in previous work. The advantages of using the star transform include the possibility to reconstruct the absorption and the scattering coefficients of the medium separately and simultaneously (from the same data) and the possibility to utilize scattered radiation which, in the case of the conventional X-ray tomography, is discarded. In this paper, we derive the star transform from physical principles, discuss its mathematical properties and analyze numerical stability of inversion. In particular, it is shown that stable inversion of the star transform can be obtained only for configurations involving odd number of rays. Several computationally-efficient inversion algorithms are derived and tested numerically.
Mandelshtam, Vladimir A.
The Multidimensional Filter Diagonalization Method II. Application to 2D Projections of 2D, 3D signals with up to four independent time variables. Direct projections of the multidimensional time- quency dimension (1). The increase in experiment time is a fair price to pay for the ability to tease out
Linde, Niklas; Chen, Jinsong; Kowalsky, Michael; Finsterle,Stefan; Rubin, Yoram; Hubbard, Susan
2004-07-01T23:59:59.000Z
With the increasing application of geophysical methods to hydrogeological problems, approaches for obtaining quantitative estimates of hydrogeological parameters using geophysical data are in great demand. A common approach to hydrogeological parameter estimation using geophysical and hydrogeological data is to first invert the geophysical data using a geophysical inversion procedure, and subsequently use the resulting estimates together with available hydrogeological information to estimate a hydrogeological parameter field. This approach does not allow us to constrain the geophysical inversion by hydrogeological data and prior information, and thus decreases our ability to make valid estimates of the hydrogeological parameter field. Furthermore, it is difficult to quantify the uncertainty in the corresponding estimates and to validate the assumptions made. They are developing alternative approaches that allow for the joint inversion of all available hydrological and geophysical data. In this presentation, they consider three studies and draw various conclusions, such as on the potential benefits of estimating the petrophysical relationships within the inversion framework and of constraining the geophysical estimates on geophysical, as well as hydrogeological data.
Joint Information CenterJoint Information Center Deepwater Horizon Response
when they see the birds that have been impacted by the Deepwa- ter Horizon/BP oil spill. While and it is determined to be within the Deepwater Horizon Oil Spill Re- sponse area, a wildlife response team is notifiedJoint Information CenterJoint Information Center Deepwater Horizon Response Incident Command Post
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.
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.
VAM2D: Variably saturated analysis model in two dimensions
Huyakorn, P.S.; Kool, J.B.; Wu, Y.S. (HydroGeoLogic, Inc., Herndon, VA (United States))
1991-10-01T23:59:59.000Z
This report documents a two-dimensional finite element model, VAM2D, developed to simulate water flow and solute transport in variably saturated porous media. Both flow and transport simulation can be handled concurrently or sequentially. The formulation of the governing equations and the numerical procedures used in the code are presented. The flow equation is approximated using the Galerkin finite element method. Nonlinear soil moisture characteristics and atmospheric boundary conditions (e.g., infiltration, evaporation and seepage face), are treated using Picard and Newton-Raphson iterations. Hysteresis effects and anisotropy in the unsaturated hydraulic conductivity can be taken into account if needed. The contaminant transport simulation can account for advection, hydrodynamic dispersion, linear equilibrium sorption, and first-order degradation. Transport of a single component or a multi-component decay chain can be handled. The transport equation is approximated using an upstream weighted residual method. Several test problems are presented to verify the code and demonstrate its utility. These problems range from simple one-dimensional to complex two-dimensional and axisymmetric problems. This document has been produced as a user's manual. It contains detailed information on the code structure along with instructions for input data preparation and sample input and printed output for selected test problems. Also included are instructions for job set up and restarting procedures. 44 refs., 54 figs., 24 tabs.
2D modeling of electromagnetic waves in cold plasmas
Crombé, K. [Laboratory for Plasma Physics, Association EURATOM - Belgian State Trilateral Euregio Cluster, Renaissancelaan 30 Avenue de la Renaissance, B-1000 Brussels, Belgium and Department of Applied Physics, Ghent University, Sint-Pietersnieuwstraat 41 B4, B (Belgium); Van Eester, D.; Koch, R.; Kyrytsya, V. [Laboratory for Plasma Physics, Association EURATOM - Belgian State Trilateral Euregio Cluster, Renaissancelaan 30 Avenue de la Renaissance, B-1000 Brussels (Belgium)
2014-02-12T23:59:59.000Z
The consequences of sheath (rectified) electric fields, resulting from the different mobility of electrons and ions as a response to radio frequency (RF) fields, are a concern for RF antenna design as it can cause damage to antenna parts, limiters and other in-vessel components. As a first step to a more complete description, the usual cold plasma dielectric description has been adopted, and the density profile was assumed to be known as input. Ultimately, the relevant equations describing the wave-particle interaction both on the fast and slow timescale will need to be tackled but prior to doing so was felt as a necessity to get a feeling of the wave dynamics involved. Maxwell's equations are solved for a cold plasma in a 2D antenna box with strongly varying density profiles crossing also lower hybrid and ion-ion hybrid resonance layers. Numerical modelling quickly becomes demanding on computer power, since a fine grid spacing is required to capture the small wavelengths effects of strongly evanescent modes.
Exact Solutions of 2d Supersymmetric Gauge Theories
Abhijit Gadde; Sergei Gukov; Pavel Putrov
2014-04-21T23:59:59.000Z
We study dynamics of two-dimensional non-abelian gauge theories with N=(0,2) supersymmetry that include N=(0,2) supersymmetric QCD and its generalizations. In particular, we present the phase diagram of N=(0,2) SQCD and determine its massive and low-energy spectrum. We find that the theory has no mass gap, a nearly constant distribution of massive states, and lots of massless states that in general flow to an interacting CFT. For a range of parameters where supersymmetry is not dynamically broken at low energies, we give a complete description of the low-energy physics in terms of 2d N=(0,2) SCFTs using anomaly matching and modular invariance. Our construction provides a vast landscape of new N=(0,2) SCFTs which, for small values of the central charge, could be used for building novel heterotic models with no moduli and, for large values of the central charge, could be dual to AdS_3 string vacua.
Foreign Fishery Developments Japanese Joint
-215. In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nationsForeign Fishery Developments Japanese Joint Fishing Ventures Stabilize Activity Trawling Skipjack tuna harvest Whaling Other harvests Aquaculture Refrigeration operations Fish processing Average $1
Joint Seminar Risk Management Institute &
Chaudhuri, Sanjay
Joint Seminar Risk Management Institute & Department of Decision Sciences Details of Seminar Date and statistics is leading to a greatly broadened theory of regression which draws on tools of convex analysis with factor analysis in finance and economics. Risk Management Institute Joint Seminar #12;
Butt, Darryl Paul; Cutler, Raymond Ashton; Rynders, Steven Walton; Carolan, Michael Francis
2006-08-22T23:59:59.000Z
A method of joining at least two sintered bodies to form a composite structure, including providing a first multicomponent metallic oxide having a perovskitic or fluorite crystal structure; providing a second sintered body including a second multicomponent metallic oxide having a crystal structure of the same type as the first; and providing at an interface a joint material containing at least one metal oxide containing at least one metal identically contained in at least one of the first and second multicomponent metallic oxides. The joint material is free of cations of Si, Ge, Sn, Pb, P and Te and has a melting point below the sintering temperatures of both sintered bodies. The joint material is heated to a temperature above the melting point of the metal oxide(s) and below the sintering temperatures of the sintered bodies to form the joint. Structures containing such joints are also disclosed.
2D Coulomb Gases and the Renormalized Energy
Sandier, Etienne
2012-01-01T23:59:59.000Z
We study the statistical mechanics of classical two-dimensional "Coulomb gases" with general potential and arbitrary \\beta, the inverse of the temperature. Such ensembles also correspond to random matrix models in some particular cases. The formal limit case \\beta=\\infty corresponds to "weighted Fekete sets" and also falls within our analysis. It is known that in such a system points should be asymptotically distributed according to a macroscopic "equilibrium measure," and that a large deviations principle holds for this, as proven by Ben Arous and Zeitouni. By a suitable splitting of the Hamiltonian, we connect the problem to the "renormalized energy" W, a Coulombian interaction for points in the plane introduced in our prior work, which is expected to be a good way of measuring the disorder of an infinite configuration of points in the plane. By so doing, we are able to examine the situation at the microscopic scale, and obtain several new results: a next order asymptotic expansion of the partition function...
Spatially-Variant Tikhonov Regularization for Double-Difference Waveform Inversion
Lin, Youzuo [Los Alamos National Laboratory; Huang, Lianjie [Los Alamos National Laboratory; Zhang, Zhigang [Los Alamos National Laboratory
2011-01-01T23:59:59.000Z
Double-difference waveform inversion is a potential tool for quantitative monitoring for geologic carbon storage. It jointly inverts time-lapse seismic data for changes in reservoir geophysical properties. Due to the ill-posedness of waveform inversion, it is a great challenge to obtain reservoir changes accurately and efficiently, particularly when using time-lapse seismic reflection data. Regularization techniques can be utilized to address the issue of ill-posedness. The regularization parameter controls the smoothness of inversion results. A constant regularization parameter is normally used in waveform inversion, and an optimal regularization parameter has to be selected. The resulting inversion results are a trade off among regions with different smoothness or noise levels; therefore the images are either over regularized in some regions while under regularized in the others. In this paper, we employ a spatially-variant parameter in the Tikhonov regularization scheme used in double-difference waveform tomography to improve the inversion accuracy and robustness. We compare the results obtained using a spatially-variant parameter with those obtained using a constant regularization parameter and those produced without any regularization. We observe that, utilizing a spatially-variant regularization scheme, the target regions are well reconstructed while the noise is reduced in the other regions. We show that the spatially-variant regularization scheme provides the flexibility to regularize local regions based on the a priori information without increasing computational costs and the computer memory requirement.
Joint Capability Technology Demonstration (JCTD) Industry Day...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Joint Capability Technology Demonstration (JCTD) Industry Day Agenda Joint Capability Technology Demonstration (JCTD) Industry Day Agenda Agenda outlines the activities of the 2014...
A Turbulent Constitutive Law for the Two-Dimensional Inverse Energy Cascade
Gregory L. Eyink
2005-12-10T23:59:59.000Z
We develop a fundamental approach to a turbulent constitutive law for the 2D inverse cascade, based upon a convergent multi-scale gradient (MSG) expansion. To first order in gradients we find that the turbulent stress generated by small-scale eddies is proportional not to strain but instead to `skew-strain,' i.e. the strain tensor rotated by $45^\\circ.$ The skew-strain from a given scale of motion makes no contribution to energy flux across eddies at that scale, so that the inverse cascade cannot be strongly scale-local. We show that this conclusion extends a result of Kraichnan for spectral transfer and is due to absence of vortex-stretching in 2D. This `weakly local' mechanism of inverse cascade requires a relative rotation between the principal directions of strain at different scales and we argue for this using both the dynamical equations of motion and also a heuristic model of `thinning' of small-scale vortices by an imposed large-scale strain. Carrying out our expansion to second-order in gradients, we find two additional terms in the stress that can contribute to energy cascade. The first is a Newtonian stress with an `eddy-viscosity' due to differential strain-rotation, and the second is a tensile stress exerted along vorticity contour-lines. The latter was anticipated by Kraichnan for a very special model situation of small-scale vortex wave-packets in a uniform strain field. We prove a proportionality in 2D between the mean rates of differential strain-rotation and of vorticity-gradient stretching, analogous to a similar relation of Betchov for 3D. According to this result the second-order stresses will also contribute to inverse cascade when, as is plausible, vorticity contour-lines lengthen on average by turbulent advection.
Expression of Ligands for the NKG2D Activating Receptor are Linked to Proliferative Signals
Jung, Heiyoun
2011-01-01T23:59:59.000Z
Upon NKG2D engagement, the ITAM in DAP12 recruits ZAP70 orcontrast, DAP10 lacks an ITAM, and instead contains a YINM
Determining Transition State Geometries in Liquids Using 2D-IR
Cahoon, James
2008-01-01T23:59:59.000Z
Material Determining transition state geometries in liquidsDetermining transition state geometries in liquids using 2D-are determined by the transition state connecting reactant
On 3D instabilities of 2D time-periodic flows - Department of ...
The Karman vortex street, the 2D periodically shedding wake of a circular cylinder, is the prototypical example. We shall consider this as well as a periodically ...
Joint probabilities and quantum cognition
Acacio de Barros, J. [Liberal Studies, 1600 Holloway Ave., San Francisco State University, San Francisco, CA 94132 (United States)
2012-12-18T23:59:59.000Z
In this paper we discuss the existence of joint probability distributions for quantumlike response computations in the brain. We do so by focusing on a contextual neural-oscillator model shown to reproduce the main features of behavioral stimulus-response theory. We then exhibit a simple example of contextual random variables not having a joint probability distribution, and describe how such variables can be obtained from neural oscillators, but not from a quantum observable algebra.
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...
Bayes Nets Representation: joint distribution and conditional
Mitchell, Tom
Bayes Nets Representation: joint distribution and conditional independence Yi Zhang 10-701, Machine joint distribution of BNs Infer C. I. from factored joint distributions D-separation (motivation) 2 structure All about the joint distribution of variables ! Conditional independence assumptions are useful
Center for Inverse Design: About the Center for Inverse Design
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItem NotEnergy,ARMForms About Batteriesmetal-organic frameworks EFRC 1001 wordInverse
A 2D Pseudodynamic Rupture Model Generator for Earthquakes on Geometrically Complex Faults
Dunham, Eric M.
A 2D Pseudodynamic Rupture Model Generator for Earthquakes on Geometrically Complex Faults complexity in the rupture process and resulting ground motion. We present a 2D kinematic rupture generator that emulates the strong dependence of earthquake source parameters on local fault geometry observed in dynamic
A 2D Graphics Interface Based on CGI Version 1.0
Clausen, Michael
) standards for device independent driving of graphics hardware, both issued from standardization institutes#12; CGI ++ A 2D Graphics Interface Based on CGI Version 1.0 Dieter W. Fellner Martin Fischer Currently, designers of 2D graphics applications have to deal with several (and unforÂ tunately incompatible
Journal of Computer Graphics Techniques Higher Quality 2D Text Rendering
Paris-Sud XI, Université de
Journal of Computer Graphics Techniques Higher Quality 2D Text Rendering Vol. 2, No. 1, 2013 http://jcgt.org Higher Quality 2D Text Rendering Nicolas P. Rougier INRIA Figure 1. When displaying text on low technology / Microsoft / native hinting) for crisp rendering or, to privilege glyph shapes (Quartz technology
Wind Tunnel and Field Test of Three 2D Sonic Anemometers
Stoffelen, Ad
Wind Tunnel and Field Test of Three 2D Sonic Anemometers Wiel Wauben R&D Information and Observation Technology, KNMI September 17, 2007 #12;#12;Wind Tunnel and Field Test of Three 2D Sonic.....................................................................................................1 2. Wind sensors
Liu, Yijun
A fast multipole boundary element method for modeling 2-D multiple crack problems with constant 3 April 2014 Accepted 20 May 2014 Keywords: Fast multipole BEM 2-D multi-crack problems Constant elements Crack opening displacements Stress intensity factors a b s t r a c t A fast multipole boundary
The following VS tools were compared: 2D OPENBABEL, DAYLIGHT2
Ritchie, Dave
The following VS tools were compared: 2D Â OPENBABEL, DAYLIGHT2 , MACCS. BCI, MOLPRINT2D3 3D Â ROCS Software Inc., Cepos Insilico Ltd., Chemical Computing Group, DAYLIGHT, Chemical Information Systems and Digital Chemistry for providing Academic Licences for ROCS, ParaSurf, MOE, DAYLIGHT, and BCI, respectively
Wavelet filtering to study mixing in 2D isotropic turbulence Carsten Beta a
École Normale Supérieure
Wavelet filtering to study mixing in 2D isotropic turbulence Carsten Beta a , Kai Schneider b simulation (CVS) filtering, based on an ortho- gonal wavelet decomposition of vorticity, to study mixing in 2; Diffusion; Wavelets 1. Introduction Decaying 2D turbulence is characterized by the emergence of long
Angular momentum and energy structure of the coherent state of a 2D isotropic harmonic oscillator
LIU Yufeng; HUO Wujun; ZENG Jinyan
1999-12-03T23:59:59.000Z
The angular momentum structure and energy structure of the coherent state of a 2D isotropic harmonic oscillator were investigated. Calculations showed that the average values of angular momentum and energy (except the zero point energy) of this nonspreading 2D wave packet are identical to those of the corresponding classical oscillator moving along a circular or an elliptic orbit.
2D-Zernike polynomials and coherent state quantization of the unit disc
K. Thirulogasanthar; Nasser Saad; G. Honnouvo
2015-01-07T23:59:59.000Z
Using the orthonormality of the 2D-Zernike polynomials, reproducing kernels, reproducing kernel Hilbert spaces, and ensuring coherent states attained. With the aid of the so-obtained coherent states, the complex unit disc is quantized. Associated upper symbols, lower symbols and related generalized Berezin transforms also obtained. A number of necessary summation formulas for the 2D-Zernike polynomials proved.
Shih, Chih-Jen, Ph. D. Massachusetts Institute of Technology
2014-01-01T23:59:59.000Z
2D materials are defined as solids with strong in-plane chemical bonds but weak out-of-plane, van der Waals (vdW) interactions. In order to realize potential applications of 2D materials in the areas of optoelectronics, ...
A feasibility study for experimentally determining dynamic force distribution in a lap joint.
Mayes, Randall Lee
2013-11-01T23:59:59.000Z
Developing constitutive models of the physics in mechanical joints is currently stymied by inability to measure forces and displacements within the joint. The current state of the art estimates whole joint stiffness and energy loss per cycle from external measured force input and one or two acceleration responses. To validate constitutive models beyond this state requires a measurement of the distributed forces and displacements at the joint interface. Unfortunately, introducing measurement devices at the interface completely disrupts the desired physics. A feasibility study is presented for a non-intrusive method of solving for the interface dynamic forces from an inverse problem using full field measured responses. The responses come from the viewable surface of a beam. The noise levels associated with digital image correlation and continuous scanning laser Doppler velocimetry are evaluated from typical beam experiments. Two inverse problems are simulated. One utilizes the extended Sum of Weighted Accelerations Technique (SWAT). The second is a new approach dubbed the method of truncated orthogonal forces. These methods are much more robust if the contact patch geometry is well identified. Various approaches to identifying the contact patch are investigated, including ion marker tracking, Prussian blue and ultrasonic measurements. A typical experiment is conceived for a beam which has a lap joint at one end with a single bolt connecting it to another identical beam. In a virtual test using the beam finite element analysis, it appears that the SWAT inverse method requires evaluation of too many coefficients to adequately identify the force distribution to be viable. However, the method of truncated orthogonal forces appears viable with current digital image correlation (and probably other) imaging techniques.
A study of generalized inverses
McKinney, Nancy Lee
1973-01-01T23:59:59.000Z
APPENDIX A A FORTRAN IV COMPUTER PROGRAM FOR CALCULATING THE GENERALIZED INVERSE OF A MATRIX. VITA PAGE 17 17 23 32 35 38 38 46 53 53 53 59 65 68 71 92 LIST OF FIGURES FIGURE 1 Least-Square Solution. . 2 Specific Least... are as follows. We extend the definition of a diagonaL matrix to all mxn matrices. We call an mxn matrix D a diagonal matrix of d. = 0 ij for i P j, i = l, . . . , m and j = l, . . . , n. Thus the only entries in D that may be nonzero are the d, i = I...
High dimensional linear inverse modelling
Cooper, Fenwick C
2015-01-01T23:59:59.000Z
We introduce and demonstrate two linear inverse modelling methods for systems of stochastic ODE's with accuracy that is independent of the dimensionality (number of elements) of the state vector representing the system in question. Truncation of the state space is not required. Instead we rely on the principle that perturbations decay with distance or the fact that for many systems, the state of each data point is only determined at an instant by itself and its neighbours. We further show that all necessary calculations, as well as numerical integration of the resulting linear stochastic system, require computational time and memory proportional to the dimensionality of the state vector.
TOPAZ2D heat transfer code users manual and thermal property data base
Shapiro, A.B.; Edwards, A.L.
1990-05-01T23:59:59.000Z
TOPAZ2D is a two dimensional implicit finite element computer code for heat transfer analysis. This user's manual provides information on the structure of a TOPAZ2D input file. Also included is a material thermal property data base. This manual is supplemented with The TOPAZ2D Theoretical Manual and the TOPAZ2D Verification Manual. TOPAZ2D has been implemented on the CRAY, SUN, and VAX computers. TOPAZ2D can be used to solve for the steady state or transient temperature field on two dimensional planar or axisymmetric geometries. Material properties may be temperature dependent and either isotropic or orthotropic. A variety of time and temperature dependent boundary conditions can be specified including temperature, flux, convection, and radiation. Time or temperature dependent internal heat generation can be defined locally be element or globally by material. TOPAZ2D can solve problems of diffuse and specular band radiation in an enclosure coupled with conduction in material surrounding the enclosure. Additional features include thermally controlled reactive chemical mixtures, thermal contact resistance across an interface, bulk fluid flow, phase change, and energy balances. Thermal stresses can be calculated using the solid mechanics code NIKE2D which reads the temperature state data calculated by TOPAZ2D. A three dimensional version of the code, TOPAZ3D is available. The material thermal property data base, Chapter 4, included in this manual was originally published in 1969 by Art Edwards for use with his TRUMP finite difference heat transfer code. The format of the data has been altered to be compatible with TOPAZ2D. Bob Bailey is responsible for adding the high explosive thermal property data.
L'vov, Victor S; Rudenko, Oleksii
2009-01-01T23:59:59.000Z
In light of some recent experiments on quasi two-dimensional (2D) turbulent channel flow we provide here a model of the ideal case, for the sake of comparison. The ideal 2D channel flow differs from its 3D counterpart by having a second quadratic conserved variable in addition to the energy, and the latter has an inverse rather than a direct cascade. The resulting qualitative differences in profiles of velocity, V, and energy, K, as a function of the distance from the wall are highlighted and explained. The most glaring difference is that the 2D channel is much more energetic, with K in wall units increasing logarithmically with the Reynolds number $\\Ret$ instead of being $\\Ret$-independent in 3D channels.
Victor S. L'vov; Itamar Procaccia; Oleksii Rudenko
2009-02-16T23:59:59.000Z
In light of some recent experiments on quasi two-dimensional (2D) turbulent channel flow we provide here a model of the ideal case, for the sake of comparison. The ideal 2D channel flow differs from its 3D counterpart by having a second quadratic conserved variable in addition to the energy, and the latter has an inverse rather than a direct cascade. The resulting qualitative differences in profiles of velocity, V, and energy, K, as a function of the distance from the wall are highlighted and explained. The most glaring difference is that the 2D channel is much more energetic, with K in wall units increasing logarithmically with the Reynolds number $\\Ret$ instead of being $\\Ret$-independent in 3D channels.
F. S. Kitaura; T. A. Ensslin
2009-11-06T23:59:59.000Z
We address the inverse problem of cosmic large-scale structure reconstruction from a Bayesian perspective. For a linear data model, a number of known and novel reconstruction schemes, which differ in terms of the underlying signal prior, data likelihood, and numerical inverse extra-regularization schemes are derived and classified. The Bayesian methodology presented in this paper tries to unify and extend the following methods: Wiener-filtering, Tikhonov regularization, Ridge regression, Maximum Entropy, and inverse regularization techniques. The inverse techniques considered here are the asymptotic regularization, the Jacobi, Steepest Descent, Newton-Raphson, Landweber-Fridman, and both linear and non-linear Krylov methods based on Fletcher-Reeves, Polak-Ribiere, and Hestenes-Stiefel Conjugate Gradients. The structures of the up-to-date highest-performing algorithms are presented, based on an operator scheme, which permits one to exploit the power of fast Fourier transforms. Using such an implementation of the generalized Wiener-filter in the novel ARGO-software package, the different numerical schemes are benchmarked with 1-, 2-, and 3-dimensional problems including structured white and Poissonian noise, data windowing and blurring effects. A novel numerical Krylov scheme is shown to be superior in terms of performance and fidelity. These fast inverse methods ultimately will enable the application of sampling techniques to explore complex joint posterior distributions. We outline how the space of the dark-matter density field, the peculiar velocity field, and the power spectrum can jointly be investigated by a Gibbs-sampling process. Such a method can be applied for the redshift distortions correction of the observed galaxies and for time-reversal reconstructions of the initial density field.
Lee, Chien-Wei; Hwu, Jenn-Gwo [Graduate Institute of Electronics Engineering/ Department of Electrical Engineering, National Taiwan University, Taipei, 10617, Taiwan (China)] [Graduate Institute of Electronics Engineering/ Department of Electrical Engineering, National Taiwan University, Taipei, 10617, Taiwan (China)
2013-10-15T23:59:59.000Z
We derive a statistical physics model of two-dimensional electron gas (2DEG) and propose an accurate approximation method for calculating the quantum-mechanical effects of metal-oxide-semiconductor (MOS) structure in accumulation and strong inversion regions. We use an exponential surface potential approximation in solving the quantization energy levels and derive the function of density of states in 2D to 3D transition region by applying uncertainty principle and Schrödinger equation in k-space. The simulation results show that our approximation method and theory of density of states solve the two major problems of previous researches: the non-negligible error caused by the linear potential approximation and the inconsistency of density of states and carrier distribution in 2D to 3D transition region.
Inverse operator representations of quantum phase
G. M. Saxena
2008-03-14T23:59:59.000Z
We define quantum phase in terms of inverses of annihilation and creation operators. We show that like Susskind - Glogower phase operators, the measured phase operators and the unitary phase operators can be defined in terms of the inverse operators. However, for the unitary phase operator the Hilbert space includes the negative energy states. The quantum phase in inverse operator representation may find the applications in the field of quantum optics particularly in the squeezed states.
Joint measurability through Naimark's theorem
Roberto Beneduci
2014-04-05T23:59:59.000Z
We use Naimark's dilation theorem in order to characterize the joint measurability of two POVMs. Then, we analyze the joint measurability of two commutative POVMs $F_1$ and $F_2$ which are the smearing of two self-adjoint operators $A_1$ and $A_2$ respectively. We prove that the compatibility of $F_1$ and $F_2$ is connected to the existence of two compatible self-adjoint dilations $A_1^+$ and $A_2^+$ of $A_1$ and $A_2$ respectively. As a corollary we prove that each couple of self-adjoint operators can be dilated to a couple of compatible self-adjoint operators. Next, we analyze the joint measurability of the unsharp position and momentum observables and show that it provides a master example of the scheme we propose. Finally, we give a sufficient condition for the compatibility of two effects.
Linear conic optimization for inverse optimal control
Edouard Pauwels
2014-11-05T23:59:59.000Z
Nov 5, 2014 ... Abstract: We address the inverse problem of Lagrangian identification based on trajectories in the context of nonlinear optimal control.
INVERSE SCATTERING OF SEISMIC DATA WITH THE ...
1910-61-22T23:59:59.000Z
We discuss the inverse scattering of seismic reflection data making use of the generalized Radon transform. Through an extension, the relevant transform attains ...
Inverse hydrochemical models of aqueous extracts tests
Zheng, L.
2010-01-01T23:59:59.000Z
Samper, J. , Yang, C. , Montenegro, L. , 2003. Users ManualSamper, J. , Vázquez, A. , Montenegro, L. , 2005. Inverse563. Samper, J. , Zhang, G. , Montenegro, L. , 2006. Coupled
Fast methods for inverse wave scattering problems
Lee, Jung Hoon, Ph. D. Massachusetts Institute of Technology
2008-01-01T23:59:59.000Z
Inverse wave scattering problems arise in many applications including computerized/diffraction tomography, seismology, diffraction/holographic grating design, object identification from radar singals, and semiconductor ...
A typology of Bantu subject inversion
Marten, Lutz; van der Wal, Jenneke
2015-01-01T23:59:59.000Z
generalisations are drawn. For example, languages with instrument inversion or with patient inversion always have locative inversion (but not vice versa), or if a language has at least one inversion construction, it always has at least either default agreement... ): (36) Se-tulo seo ba-sadi ba-se-rek-ile-ng kajeno … [Sesotho] 7-chair REL7 2-woman SM2-OM7-buy-PRF-REL today ‘The chair which the women bought today …’ (37) Mbatya dza-va-ka-son-er-a va-kadzi [Shona] 10.clothes REL10-SM2...
Rao-Blackwellised Interacting Markov Chain Monte Carlo for Electromagnetic Scattering Inversion
Giraud, François
2012-01-01T23:59:59.000Z
The following electromagnetism (EM) inverse problem is addressed. It consists in estimating local radioelectric properties of materials recovering an object from the global EM scattering measurement, at various incidences and wave frequencies. This large scale ill-posed inverse problem is explored by an intensive exploitation of an efficient 2D Maxwell solver, distributed on High Performance Computing (HPC) machines. Applied to a large training data set, a statistical analysis reduces the problem to a simpler probabilistic metamodel, on which Bayesian inference can be performed. Considering the radioelectric properties as a dynamic stochastic process, evolving in function of the frequency, it is shown how advanced Markov Chain Monte Carlo methods, called Sequential Monte Carlo (SMC) or interacting particles, can provide estimations of the EM properties of each material, and their associated uncertainties.
2D electron density profile measurement in tokamak by laser-accelerated ion-beam probe
Chen, Y. H.; Yang, X. Y.; Lin, C., E-mail: linchen0812@pku.edu.cn, E-mail: cjxiao@pku.edu.cn; Wang, X. G.; Xiao, C. J., E-mail: linchen0812@pku.edu.cn, E-mail: cjxiao@pku.edu.cn [State Key Lab of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871 (China); Wang, L. [Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190 (China); Xu, M. [Center for Fusion Science of Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041 (China)
2014-11-15T23:59:59.000Z
A new concept of Heavy Ion Beam Probe (HIBP) diagnostic has been proposed, of which the key is to replace the electrostatic accelerator of traditional HIBP by a laser-driven ion accelerator. Due to the large energy spread of ions, the laser-accelerated HIBP can measure the two-dimensional (2D) electron density profile of tokamak plasma. In a preliminary simulation, a 2D density profile was reconstructed with a spatial resolution of about 2 cm, and with the error below 15% in the core region. Diagnostics of 2D density fluctuation is also discussed.
Joint Fuel Cell Technologies and Advanced Manufacturing Webinar...
Broader source: Energy.gov (indexed) [DOE]
Joint Fuel Cell Technologies and Advanced Manufacturing Webinar Joint Fuel Cell Technologies and Advanced Manufacturing Webinar Presentation slides from the joint Fuel Cell...
Joint Technical Operations Team | National Nuclear Security Administra...
National Nuclear Security Administration (NNSA)
Render Safe Joint Technical Operations Team Joint Technical Operations Team JTOT Logo NNSA's Joint Technical Operations Team (JTOT) provides specialized technical...
Summarizing and Mining Inverse Distributions on Data Streams via Dynamic Inverse Sampling
Cormode, Graham
Summarizing and Mining Inverse Distributions on Data Streams via Dynamic Inverse Sampling Graham data stream management systems approach this problem by sum- marizing and mining the distributions for summariz- ing and mining inverse distributions of data streams: they rely on a novel technique to maintain
Offered jointly with International Business
Offered jointly with Master in International Business #12;.02 Welcome to Barcelona Welcome to UPF Pompeu Fabra (UPF), in the very heart of Barcelona. UPF is a public institution established in 1990, and is integrated into the urban fabric of the city, contributing to and participating in its dynamism. The UPF has
M. Calixto; E. Romera
2015-02-11T23:59:59.000Z
We propose a new method to identify transitions from a topological insulator to a band insulator in silicene (the silicon equivalent of graphene) in the presence of perpendicular magnetic and electric fields, by using the R\\'enyi-Wehrl entropy of the quantum state in phase space. Electron-hole entropies display an inversion/crossing behavior at the charge neutrality point for any Landau level, and the combined entropy of particles plus holes turns out to be maximum at this critical point. The result is interpreted in terms of delocalization of the quantum state in phase space. The entropic description presented in this work will be valid in general 2D gapped Dirac materials, with a strong intrinsic spin-orbit interaction, isoestructural with silicene.
Linde, Niklas
2008-01-01T23:59:59.000Z
37 (10), 2431-2456. Linde, N. , A. Binley, A. Tryggvason, L.doi:10.1029/2006WR005131. Linde, N. , S. Finsterle, and S.Tryggvason, A. , and N. Linde, 2006, Local earthquake (LE)
Kang, Peter K.
2013-01-01T23:59:59.000Z
Traditionally, seismic interpretation is performed without any account of the flow behavior. Here, we present a methodology to characterize fractured geologic media by integrating flow and seismic data. The key element of ...
Zhang, Zhishuai
2012-10-19T23:59:59.000Z
of Characterization Results Conditioned on Various Observations ......................................................................................... 29 Figure 3-5 MAP Characterization Result with Downhole Temperature Sensors .. 30 Figure 3-6 Production... the lower layer of the reservoir has a higher temperature. Thus, production temperature carries information about hydraulic properties distribution with depth in the reservoir. In addition, the usage of modern monitor technology like permanent downhole...
Time-lapse Joint Inversion of Geophysical Data and its Applications...
Broader source: Energy.gov (indexed) [DOE]
at Pagosa Springs (CO) * New method of time lapse geophysics * New method to monitor fracking Summary 16 | US DOE Geothermal Office eere.energy.gov Timeline: Budget: Project...
Joint inversion of electrical and seismic data for Fracture char. and
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
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: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't YourTransport(FactDepartment ofLetter Report: I11IG002RTC3 | ofproposalofDepartmentandon
Time-lapse Joint Inversion of Geophysical Data and its Applications to
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
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: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOriginEducationVideoStrategic|Industrial Sector,Department ThirdCosts | DepartmentTime-Off
Storage and analysis techniques for fast 2-D camera data on W. M. Davisa
Princeton Plasma Physics Laboratory
Storage and analysis techniques for fast 2-D camera data on NSTX W. M. Davisa *, D.M. Mastrovitoa, and this year, one new camera alone can acquire 2GB per pulse. The paper will describe the storage strategies
Maduri, Rajesh Kumar
2008-02-01T23:59:59.000Z
The primary focus of this thesis is to present a framework to develop higher order global differentiability local approximations for 2-D and 3-D distorted element geometries. The necessity and superiority of higher order global differentiability...
Hydrogen Bond Rearrangements in Water Probed with Temperature-Dependent 2D IR
Nicodemus, Rebecca A.
We use temperature-dependent two-dimensional infrared spectroscopy (2D IR) of dilute HOD in H2O to investigate hydrogen bond rearrangements in water. The OD stretching frequency is sensitive to its environment, and loss ...
2-D Magnetotellurics At The Geothermal Site At Soultz-Sous-Forets...
The Geothermal Site At Soultz-Sous-Forets- Resistivity Distribution To About 3000 M Depth Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: 2-D...
adriano 2d-model tests: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
a 2nd order (toroidal) field may be uniform or has a prescribed gradient. In this test phase, the 2D code is ran Paris-Sud XI, Universit de 2 Accuracy in Scientific...
Prospects for high thermoelectric figures of merit in 2D systems
Dresselhaus, M.S.; Sun, X.; Cronin, S.B.; Koga, T.; Dresselhaus, G.; Wang, K.L.
1997-07-01T23:59:59.000Z
Enhanced ZT has been predicted theoretically and observed experimentally in 2D quantum wells, with good agreement between theory and experiment. Advantages of low dimensional systems for thermoelectric applications are described and prospects for further enhancement of ZT are discussed.
2D-Modelling of pellet injection in the poloidal plane: results of numerical tests
Paris-Sud XI, UniversitÃ© de
2D-Modelling of pellet injection in the poloidal plane: results of numerical tests P. Lalousis developed for computing the expansion of pellet-produced clouds in the poloidal plane. The expansion
Signal Integrity Analysis of a 2-D and 3-D Integrated Potentiostat for Neurotransmitter Sensing
Stanacevic, Milutin
for the substrate, power network, and through silicon vias (TSVs). These models are combined integrated implantable systems. I. INTRODUCTION A multichannel potentiostat, integrated with micro and power dissipation. Signal integrity characteristics of a 2- D and 3-D integrated potentiostat
A sequential partly iterative approach for multicomponent reactive transport with CORE2D
Samper, J.
2009-01-01T23:59:59.000Z
Juncosa R. , Delgado J. and Montenegro L. (2000) CORE 2D : App. Samper, J. , Yang, C. , Montenegro, L. , 2003. CORE 2DSamper, J. , Zhang, G. , Montenegro, L. , 2006a. Coupled
CONTENT-BASED 3D OBJECT RETRIEVAL USING 2D VIEWS Thibault Napoleon
Sahbi, Hichem
CONTENT-BASED 3D OBJECT RETRIEVAL USING 2D VIEWS Thibault Napol´eon TELECOM ParisTech, CNRS UMR 5141 46 rue Barrault 75013 Paris, France napoleon@telecom-paristech.fr Hichem Sahbi CNRS UMR 5141
Development of an Independent Hip Drive for a 2D Biped Walking Machine
Rooney, Craig
2012-08-31T23:59:59.000Z
and Automation Laboratory (ISAL) at the University of Kansas has developed a two dimensional (2D) biped walker, nicknamed the Jaywalker, in order to study the requirements necessary for a bipedal robot to traverse uneven terrain and successfully regain stability...
Compatible, energy and symmetry preserving 2D Lagrangian hydrodynamics in rz-cylindrical coordinates
Shashkov, Mikhail [Los Alamos National Laboratory; Wendroff, Burton [Los Alamos National Laboratory; Burton, Donald [Los Alamos National Laboratory; Barlow, A [AWE; Hongbin, Guo [ASU
2009-01-01T23:59:59.000Z
We present a new discretization for 2D Lagrangian hydrodynamics in rz geometry (cylindrical coordinates) that is compatible, energy conserving and symmetry preserving. We describe discretization of the basic Lagrangian hydrodynamics equations.
A distributional approach to the geometry of 2D dislocations at the mesoscale
Lisbon, University of
A distributional approach to the geometry of 2D dislocations at the mesoscale Part A: General introduce the meso-scale as defined by some average distance between the dislocations. The laws governing
2d-LC-MS/MS Method-ORNL Developed for Bacteriophage
Sullivan, Matthew B.
mass spectrometry (2d-LC-MS/MS) method was optimized for bacteriophage by Kristen Corrier undergraduate should be. 4. The mass spectrometer is run in data dependent mode, specific settings should be optimized
Implementation, study and calibration of a modified ASM2d for the simulation of SBR processes
Sludge Model n. 2d, its new features are the splitting of the nitrification stage in a two-step process for the "train" of the controller. Materials and method In Table 1, the characteristics of the synthetic f
Positive and inverse isotope effect on superconductivity
Tian De Cao
2009-09-04T23:59:59.000Z
This article improves the BCS theory to include the inverse isotope effect on superconductivity. An affective model can be deduced from the model including electron-phonon interactions, and the phonon-induced attraction is simply and clearly explained on the electron Green function. The focus of this work is on how the positive or inverse isotope effect occurs in superconductors.
Reservoir Characterization Using Intelligent Seismic Inversion
Mohaghegh, Shahab
reservoir performance. Field Development #12;- Issues about the data and problems regarding data analysis characterization studies. - Inverse modeling of reservoir properties from the seismic data is known as seismic inversion. SEISMIC LOGS #12;1. Does a relationship exist between seismic data and reservoir characteristics
JOINT PROGRAM IN TRANSPORTATION UNIVERSITY OF TORONTO
Toronto, University of
JOINT PROGRAM IN TRANSPORTATION UNIVERSITY OF TORONTO 2001 TRANSPORTATION TOMORROW SURVEY of Transportation, Ontario Additions in 1996 Regional Municipalities of Niagara, Waterloo Counties of Peterborough not to participate) #12;JOINT PROGRAM IN TRANSPORTATION UNIVERSITY OF TORONTO 2001 TRANSPORTATION TOMORROW SURVEY
Proteomic analysis of E. coli using 2D HPLC and MALDI-TOF mass spectrometry
Campbell, Christopher S
2013-02-22T23:59:59.000Z
In partial fulfillment of the requirements of the UNIVERSITY UNDERGRADUATE RESEARCH FELLOWS April 2002 Group: Life Sciences I PROTEOMIC ANALYSIS OF E. COLI USING 2D HPLC AND MALDI-TOF MASS SPECTROMETRY A Senior Thesis By CHRISTOPHER S. CAMPBELL... April 2002 Group: Life Sciences I ABSTRACT Proteomic Analysis of E. coli Using 2D HPLC and MALDI-TOF Mass Spectrometry. Christopher S. Campbell Department of Biochemisty/Biophysics Texac AkM University Fellows Advisor; Dr. James C. Hu Department...
Exfoliation of self-assembled 2D organic-inorganic perovskite semiconductors
Steiner, Ullrich
Exfoliation of self-assembled 2D organic-inorganic perovskite semiconductors Wendy Niu,1,a) Anna-inorganic perovskite (C6H9C2H4NH3)2PbI4 are produced using micromechanical exfoliation. Mono- and few-layer areas microme- chanical exfoliation of 2D PbI perovskites and explore the few-layer behaviour of such systems
Note and calculations concerning elastic dilatancy in 2D glass-glass liquid foams
François Molino; Pierre Rognon; Cyprien Gay
2010-10-30T23:59:59.000Z
When deformed, liquid foams tend to raise their liquid contents like immersed granular materials, a phenomenon called dilatancy. We have aready described a geometrical interpretation of elastic dilatancy in 3D foams and in very dry foams squeezed between two solid plates (2D GG foams). Here, we complement this work in the regime of less dry 2D GG foams. In particular, we highlight the relatively strong dilatancy effects expected in the regime where we have predicted rapid Plateau border variations.
Joint Genome Institute's Automation Approach and History
Roberts, Simon
2006-01-01T23:59:59.000Z
Joint Genome Institute’s Automation Approach and Historythroughput environment; – automation does not necessarilyissues “Islands of Automation” – modular instruments with
The Joint Essential Numerical Range of operators
Li, Chi-Kwong
The Joint Essential Numerical Range of operators: Convexity and Related Results Chi-Kwong Li Classification 47A12, 47A13, 47A55. Keywords Joint essential numerical range, self-adjoint operator, Hilbert the joint behavior of several operators A1, . . . , Am. One may see [1, 5, 12, 14, 15, 16, 19, 23, 28, 31
JOINT DEGREE PROGRAMS DEFINITION AND POLICY
Omiecinski, Curtis
1 JOINT DEGREE PROGRAMS DEFINITION AND POLICY: Within the fields of medicine and law, dual training for such complementary training can be demonstrated, the creation of a formal "Joint" degree program in which students or MD) offered at Penn State may be warranted. Such Joint degree programs enhance the educational
JOINTLY HYPONORMAL PAIRS OF COMMUTING SUBNORMAL OPERATORS NEED NOT BE JOINTLY SUBNORMAL
Curto, RaÃºl
JOINTLY HYPONORMAL PAIRS OF COMMUTING SUBNORMAL OPERATORS NEED NOT BE JOINTLY SUBNORMAL RAÂ´UL E operators, jointly hyponormal but not admitting commuting normal extensions. Each such family can be used] := ST - TS. We say that an n-tuple T = (T1, Â· Â· Â· , Tn) of operators on H is (jointly) hyponormal
Sainudiin, Raazesh
READY FOR TODAY. PREPARING FOR TOMORROW. #12;The Joint Operating Environment is intended to inform. Inquiries about the Joint Operating Environment should be directed to USJFCOM Public Affairs, 1562 Mitscher R O N M E N T ( J O E ) #12;While U.S. Joint Forces Command's Joint Operating Environment (JOE
Sassen, D. S.; Peterson, J. E.
2010-03-15T23:59:59.000Z
Significant errors related to poor time zero estimation, well deviation or mislocation of the transmitter (TX) and receiver (RX) stations can render even the most sophisticated modeling and inversion routine useless. Previous examples of methods for the analysis and correction of data errors in geophysical tomography include the works of Maurer and Green (1997), Squires et al. (1992) and Peterson (2001). Here we follow the analysis and techniques of Peterson (2001) for data quality control and error correction. Through our data acquisition and quality control procedures we have very accurate control on the surface locations of wells, the travel distance of both the transmitter and receiver within the boreholes, and the change in apparent zero time. However, we often have poor control on well deviations, either because of economic constraints or the nature of the borehole itself prevented the acquisition of well deviation logs. Also, well deviation logs can sometimes have significant errors. Problems with borehole deviations can be diagnosed prior to inversion of travel-time tomography data sets by plotting the apparent velocity of a straight ray connecting a transmitter (TX) to a receiver (RX) against the take-off angle of the ray. Issues with the time-zero pick or distances between wells appear as symmetric smiles or frown in these QC plots. Well deviation or dipping-strong anisotropy will result in an asymmetric correlation between apparent velocity and take-off angle (Figure 1-B). In addition, when a network of interconnected GPR tomography data is available, one has the additional quality constraint of insuring that there is continuity in velocity between immediately adjacent tomograms. A sudden shift in the mean velocity indicates that either position deviations are present or there is a shift in the pick times. Small errors in well geometry may be effectively treated during inversion by including weighting, or relaxation, parameters into the inversion (e.g. Bautu et al., 2006). In the technique of algebraic reconstruction tomography (ART), which is used herein for the travel time inversion (Peterson et al., 1985), a small relaxation parameter will smooth imaging artifacts caused by data errors at the expense of resolution and contrast (Figure 2). However, large data errors such as unaccounted well deviations cannot be adequately suppressed through inversion weighting schemes. Previously, problems with tomograms were treated manually. However, in large data sets and/or networks of data sets, trial and error changes to well geometries become increasingly difficult and ineffective. Mislocation of the transmitter and receiver stations of GPR cross-well tomography data sets can lead to serious imaging artifacts if not accounted for prior to inversion. Previously, problems with tomograms have been treated manually prior to inversion. In large data sets and/or networks of tomographic data sets, trial and error changes to well geometries become increasingly difficult and ineffective. Our approach is to use cross-well data quality checks and a simplified model of borehole deviation with particle swarm optimization (PSO) to automatically correct for source and receiver locations prior to tomographic inversion. We present a simple model of well deviation, which is designed to minimize potential corruption of actual data trends. We also provide quantitative quality control measures based on minimizing correlations between take-off angle and apparent velocity, and a quality check on the continuity of velocity between adjacent wells. This methodology is shown to be accurate and robust for simple 2-D synthetic test cases. Plus, we demonstrate the method on actual field data where it is compared to deviation logs. This study shows the promise for automatic correction of well deviations in GPR tomographic data. Analysis of synthetic data shows that very precise estimates of well deviation can be made for small deviations, even in the presence of static data errors. However, the analysis of the synthetic data and the application of
FireStem2D A Two-Dimensional Heat Transfer Model for Simulating Tree Stem Injury in Fires
FireStem2D A Two-Dimensional Heat Transfer Model for Simulating Tree Stem Injury in Fires, et al. (2013) FireStem2D A Two-Dimensional Heat Transfer Model for Simulating Tree Stem Injury
Surface Science Letters The 2-D growth of gold on single-layer graphene/Ru(0001): Enhancement of
Goodman, Wayne
Surface Science Letters The 2-D growth of gold on single-layer graphene/Ru(0001): Enhancement of CO online 7 May 2011 Keywords: Graphene Ru(0001) STM 2-D Au CO adsorption IRAS The growth and morphology of two-dimensional (2-D) gold islands on a single-layer graphene supported on Ru(0001) have been studied
Li, Jian (New Milford, CT)
2002-01-01T23:59:59.000Z
A metal-ceramic joint assembly in which a brazing alloy is situated between metallic and ceramic members. The metallic member is either an aluminum-containing stainless steel, a high chromium-content ferritic stainless steel or an iron nickel alloy with a corrosion protection coating. The brazing alloy, in turn, is either an Au-based or Ni-based alloy with a brazing temperature in the range of 9500 to 1200.degree. C.
Kirby, Cynthia Dawn
1998-01-01T23:59:59.000Z
SETUP 3. 4. 1 Loading System. 3. 4. 2 Deformation Measurements . . . . Vt X111 . 1 . I . 1 . 2 . 3 . . . . 3 . 3 . 4 . 5 . . . 6 . 6 . 6 . 7 . 9 . 11 . 13 . 13 . 13 . 13 . 15 . 15 . 15 . 16 . 17 . 19 . 19 . 20 Page 3. 4... Vertical Bearing. 4. 6. 4 Beam Failure Mechanism. Page 4. 6. 5 Column Failure Mechanism 4. 6. 6 Predicted Failure Mechanisms 4. 7 JOINT STRENGTH PREDICTIONS (DISCONTINUOUS BEAM DIRECTION). 5. RESPONSE 5. 1 INTRODUCTION . . 5. 2. GENERAL BEHAVIOR 5...
acoustic impedance inversion: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Topic Index 1 ACOUSTIC IMPEDANCE INVERSION FOR STATIC AND DYNAMIC CHARACTERIZATION OF A CO2 EOR PROJECT, Fossil Fuels Websites Summary: ACOUSTIC IMPEDANCE INVERSION FOR STATIC...
Local Uniqueness for the Fixed Energy Fixed Angle Inverse Problem ...
Abstract. We prove local uniqueness for the inverse problem in obstacle scattering at a fixed energy and fixed incident angle. We consider the inverse problem of ...
Self-Inverse Interleavers for Turbo Codes
Sakzad, Amin; Panario, Daniel; Eshghi, Nasim
2010-01-01T23:59:59.000Z
In this work we introduce and study a set of new interleavers based on permutation polynomials and functions with known inverses over a finite field $\\mathbb{F}_q$ for using in turbo code structures. We use Monomial, Dickson, M\\"{o}bius and R\\'edei functions in order to get new interleavers. In addition we employ Skolem sequences in order to find new interleavers with known cycle structure. As a byproduct we give an exact formula for the inverse of every R\\'edei function. The cycle structure of R\\'edei functions are also investigated. Finally, self-inverse versions of permutation functions are used to construct interleavers. These interleavers are their own de-interleavers and are useful for turbo coding and turbo decoding. Experiments carried out for self-inverse interleavers constructed using these kind of permutation polynomials and functions show excellent agreement with our theoretical results.
Transparent Conducting Electrodes based on 1D and 2D Ag Nanogratings for Organic Photovoltaics
Zeng, Beibei; Bartoli, Filbert J
2014-01-01T23:59:59.000Z
The optical and electrical properties of optically-thin one-dimensional (1D) Ag nanogratings and two-dimensional (2D) Ag nanogrids are studied, and their use as transparent electrodes in organic photovoltaics are explored. A large broadband and polarization-insensitive optical absorption enhancement in the organic light-harvesting layers is theoretically and numerically demonstrated using either single-layer 2D Ag nanogrids or two perpendicular 1D Ag nanogratings, and is attributed to the excitation of surface plasmon resonances and plasmonic cavity modes. Total photon absorption enhancements of 150% and 200% are achieved for the optimized single-layer 2D Ag nanogrids and double (top and bottom) perpendicular 1D Ag nanogratings, respectively.
MODELING THE TRANSVERSE THERMAL CONDUCTIVITY OF 2D-SICF/SIC COMPOSITES
Youngblood, Gerald E.; Senor, David J.; Jones, Russell H.
2002-09-01T23:59:59.000Z
A hierarchical model was developed to describe the effective transverse thermal conductivity, K effective, of a 2D-SiC/SiC composite made from stacked and infiltrated woven fabric layers in terms of constituent properties and microstructural and architectural variables. The model includes the expected effects of fiber-matrix interfacial conductance as well as the effects of high fiber packing fractions within individual tows and the non-uniform nature of 2D-fabric layers that include a significant amount of interlayer porosity. Model predictions were obtained for two versions of DuPont 2D-Hi Nicalon(Trademark)/PyC/ICVI-SiC composite, one with a thin (0.110 micron) and the other with a thick (1.040 micron) PyC fiber coating. The model predicts that the matrix porosity content and porosity shape factor have a major influence on K effective(T) for such a composite.
Splitting of 3d quaternion dimensions into 2d-sells and a "world screen technology"
Alexander P. Yefremov
2012-02-14T23:59:59.000Z
A set of basic vectors locally describing metric properties of an arbitrary 2-dimensional (2D) surface is used for construction of fundamental algebraic objects having nilpotent and idempotent properties. It is shown that all possible linear combinations of the objects when multiplied behave as a set of hypercomples (in particular, quaternion) units; thus interior structure of the 3D space dimensions pointed by the vector units is exposed. Geometric representations of elementary surfaces (2D-sells) structuring the dimensions are studied in detail. Established mathematical link between a vector quaternion triad treated as a frame in 3D space and elementary 2D-sells prompts to raise an idea of "world screen" having 1/2 of a space dimension but adequately reflecting kinematical properties of an ensemble of 3D frames.
Inverse problem for incremental synchrotron radiation
Fisch, N.J.
1987-06-01T23:59:59.000Z
Significantly more information is available from synchrotron emission from a plasma when the plasma is purposefully disturbed. An inverse problem, to deduce properties of the disturbance given time-dependent radiation data, is proposed. The fast time response of radiation detectors is fully exploited by this approach. A special case of interest, perpendicular observation of a steady-state plasma, lends itself to an analytic inversion.
A fluorophosphate-based inverse Keggin structure
Fielden, John; Quasdorf, Kyle; Cronin, Leroy; Kogerler, Paul
2012-07-17T23:59:59.000Z
An unusual PFO(3)(2-)-templated "inverse Keggin" polyanion, [Mo(12)O(46)(PF)(4)](4-), has been isolated from the degradation reaction of an {Mo(132)}-type Keplerate to [PMo(12)O(40)](3-) by [Cu(MeCN)(4)](PF(6)) in acetonitrile. (31)P-NMR studies suggest a structure-directing role for [Cu(MeCN)(4)](+) in the formation of the highly unusual all-inorganic inverse Keggin structure.
Partitioned Waveform Inversion Applied to Eurasia and Northern Africa
bedle, H; Matzel, E; Flanagan, M
2006-07-27T23:59:59.000Z
This report summarizes the data analysis achieved during Heather Bedle's eleven-week Technical Scholar internship at Lawrence Livermore National Labs during the early summer 2006. The work completed during this internship resulted in constraints on the crustal and upper mantle S-velocity structure in Northern Africa, the Mediterranean, the Middle East, and Europe, through the fitting of regional waveform data. This data extends current raypath coverage and will be included in a joint inversion along with data from surface wave group velocity measurements, S and P teleseismic arrival time data, and receiver function data to create an improved velocity model of the upper mantle in this region. The tectonic structure of the North African/Mediterranean/Europe/Middle Eastern study region is extremely heterogeneous. This region consists of, among others, stable cratons and platforms such as the West Africa Craton, and Baltica in Northern Europe; oceanic subduction zones throughout the Mediterranean Sea where the African and Eurasian plate collide; regions of continental collision as the Arabian Plate moves northward into the Turkish Plate; and rifting in the Red Sea, separating the Arabian and Nubian shields. With such diverse tectonic structures, many of the waveforms were difficult to fit. This is not unexpected as the waveforms are fit using an averaged structure. In many cases the raypaths encounter several tectonic features, complicating the waveform, and making it hard for the software to converge on a 1D average structure. Overall, the quality of the waveform data was average, with roughly 30% of the waveforms being discarded due to excessive noise that interfered with the frequency ranges of interest. An inversion for the 3D S-velocity structure of this region was also performed following the methodology of Partitioned Waveform Inversion (Nolet, 1990; Van der Lee and Nolet, 1997). The addition of the newly fit waveforms drastically extends the range of the model. The model now extends as far east in Africa to cover Chad and Niger, and reaches south to cover Zambia. The model is also stretched eastward to cover the eastern half of India, and northward to cover the southern portion of Scandinavia.
Study of the 2-d CP(N-1) models at ?=0 and ?
B. B. Beard; M. Pepe; S. Riederer; U. J. Wiese
2004-09-14T23:59:59.000Z
We present numerical results for 2-d CP(N-1) models at \\theta=0 and \\pi obtained in the D-theory formulation. In this formulation we construct an efficient cluster algorithm and we show numerical evidence for a first order transition for CP(N-1\\geq 2) models at \\theta = \\pi. By a finite size scaling analysis, we also discuss the equivalence in the continuum limit of the D-theory formulation of the 2-d CP(N-1) models and the usual lattice definition.
Learning to segment texture in 2D vs. 3D : A comparative study
Oh, Se Jong
2004-11-15T23:59:59.000Z
in Ri. Finally, we get the Gabor energy matrix E(x,y), Orientation response matrix O(x,y), and Frequency response matrix F(x,y). . . . . . . . . . . . 28 11 Generating the 2D input set (2D preprocessing). The procedure used to generate the training data... differences (such as difference in orientation) exist. According to Chubb et al. [10], any first-order (quasi- linear) mechanism cannot detect the boundary that emerges between two textures of equal mean luminance but composed of differently oriented...
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
Joint Center for Artificial Photosynthesis
Koval, Carl; Lee, Kenny; Houle, Frances; Lewis, Nate
2013-12-10T23:59:59.000Z
The Joint Center for Artificial Photosynthesis (JCAP) is the nation's largest research program dedicated to the development of an artificial solar-fuel generation technology. Established in 2010 as a U.S. Department of Energy (DOE) Energy Innovation Hub, JCAP aims to find a cost-effective method to produce fuels using only sunlight, water, and carbon dioxide as inputs. JCAP brings together more than 140 top scientists and researchers from the California Institute of Technology and its lead partner, Berkeley Lab, along with collaborators from the SLAC National Accelerator Laboratory, and the University of California campuses at Irvine and San Diego.
Joint Center for Artificial Photosynthesis
Koval, Carl; Lee, Kenny; Houle, Frances; Lewis, Nate
2013-12-19T23:59:59.000Z
The Joint Center for Artificial Photosynthesis (JCAP) is the nation's largest research program dedicated to the development of an artificial solar-fuel generation technology. Established in 2010 as a U.S. Department of Energy (DOE) Energy Innovation Hub, JCAP aims to find a cost-effective method to produce fuels using only sunlight, water, and carbon dioxide as inputs. JCAP brings together more than 140 top scientists and researchers from the California Institute of Technology and its lead partner, Berkeley Lab, along with collaborators from the SLAC National Accelerator Laboratory, and the University of California campuses at Irvine and San Diego.
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
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: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't YourTransport(FactDepartment ofLetter Report: I11IG002RTC3 | ofproposalof Energy usJoint
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is Your Home as Ready for(SC)Joint Genome Institute (JGI)
Joint Announcement | Department of Energy
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
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: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onYouTube YouTube Note: Since the.pdfBreaking ofOil & Gas Â» MethaneJohnson Controls EnergyJoin the EnergyJoin usJoint
Joint Outreach Task Group Calendar: September 2013
Broader source: Energy.gov [DOE]
Joint Outreach Task Group (JOTG)has created a monthly calendar of community events to facilitate interagency and community involvement in these events. September 2013
JIBS | Joint Institute for Biological Sciences | ORNL
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
joint institute is located close to ORNL's Laboratory for Comparative and Functional Genomics, other biomolecular sciences research laboratories, and the Environmental Sciences...
Joint Inference for Competing Risks Data
Li, Gang; Yang, Qing
2015-01-01T23:59:59.000Z
N. (1978), “The analysis of failure times in the presence ofall failure types and groups. For regression analysis offailure types. Section 3 develops joint regression analysis
The visibility complex made visibly simple an introduction to 2D structures of visibility
Durand, Frédo
. Then a sweeping algorithm that can build the complex in O(mlog(n)) where n is the size of the visibility graph when a line becomes tangent to three objects. This is shown in the video. The complex is build usingThe visibility complex made visibly simple an introduction to 2D structures of visibility Fr
Development of a Hybrid Powered 2D Biped Walking Machine Designed for Rough Terrain Locomotion
Baker, Bryce C.
2010-07-28T23:59:59.000Z
has built a three legged 2D biped walking machine to be used as a test stand for studying rough terrain walking. The specific aim of this research is to investigate how biped walkers can best maintain walking stability when acted upon by small...
2D and 3D high-resolution imaging to reconstruct the microstructure of clay media
Paris-Sud XI, Université de
2D and 3D high-resolution imaging to reconstruct the microstructure of clay media J.C. Robinet1 & S compacted clay (illite) system, considered to be an analogy for the clay matrix constituting clay-rocks, and three different clayrocks (Callovo-Oxfordian argilites (FR), Opalinus Clay (CH), Boom Clay (BE)). Part
Wake effects characterization using wake oscillator model Comparison on 2D response with experiments
Paris-Sud XI, Université de
forces -- Fext contain the hydrodynamic forces (drag, lift and forces issued from the potential theory oscillators is developed to predict the 2D motion in a transverse plan of two rigid cylinders in tandem. Extended studies have been conduced to describe and explain them for spring mounted uniform cylinders
Full paper / Mmoire Self-assembly of hybrid solids consisting of 2D supramolecular
Paik Suh, Myunghyun
Full paper / Mémoire Self-assembly of hybrid solids consisting of 2D supramolecular networks- selected molecular building blocks may yield designed supramolecular structure in one-pot process. We have been interested in construction of the materials, where two species with different properties coexist
Vuong, Au K
2014-05-05T23:59:59.000Z
the 2-D CWT to character- ize the surface of two samples of Fe_(2)O_(3) and three samples of calcite. For a fresh surface of the calcite mineral, a cleavage plane exposed by fracturing, the surface measurements show discrete jumps in height because...
Inspection design using 2D phased array, TFM and cueMAP software
McGilp, Ailidh; Dziewierz, Jerzy; Lardner, Tim; Mackersie, John; Gachagan, Anthony [Centre for Ultrasonic Engineering, University of Strathclyde, Glasgow (United Kingdom)
2014-02-18T23:59:59.000Z
A simulation suite, cueMAP, has been developed to facilitate the design of inspection processes and sparse 2D array configurations. At the core of cueMAP is a Total Focusing Method (TFM) imaging algorithm that enables computer assisted design of ultrasonic inspection scenarios, including the design of bespoke array configurations to match the inspection criteria. This in-house developed TFM code allows for interactive evaluation of image quality indicators of ultrasonic imaging performance when utilizing a 2D phased array working in FMC/TFM mode. The cueMAP software uses a series of TFM images to build a map of resolution, contrast and sensitivity of imaging performance of a simulated reflector, swept across the inspection volume. The software takes into account probe properties, wedge or water standoff, and effects of specimen curvature. In the validation process of this new software package, two 2D arrays have been evaluated on 304n stainless steel samples, typical of the primary circuit in nuclear plants. Thick section samples have been inspected using a 1MHz 2D matrix array. Due to the processing efficiency of the software, the data collected from these array configurations has been used to investigate the influence sub-aperture operation on inspection performance.
An Efficient Genetic Algorithm for Predicting Protein Tertiary Structures in the 2D HP Model
Istrail, Sorin
, predicting its tertiary structure is known as the protein folding problem. This problem has been widely genetic algo- rithm for the protein folding problem under the HP model in the two-dimensional square Genetic Algorithm, Protein Folding Problem, 2D HP Model 1. INTRODUCTION Amino acids are the building
2D Piecewise Algebraic Splines for Implicit Modeling University of Hull
Tian, Jie
-dimensional spline techniques based on nonregular 2D polygons, such as box spline and simplex spline, are generally. In this article, a new type of bivariate spline function is introduced. This newly proposed type of bivariate. Graph. 28, 2, Article 13 (April 2009), 19 pages. DOI = 10.1145/1516522.1516524 http://doi.acm.org/10
Feature Based Rendering for 2D/3D Partial Volume Segmentation Zigang Wang1
Feature Based Rendering for 2D/3D Partial Volume Segmentation Datasets Zigang Wang1 and Zhengrong 11794, USA ABSTRACT In this paper, a new feature based rendering algorithm for partial volume is presented. This algorithm utilizes both surface and volume information for the rendering of the partial
Nonlinear interaction of compressional waves in a 2D dusty plasma crystal
Goree, John
sound waves is dispersionless [4,9,10], with a speed CL = /k given in Ref. [9]. Here, 2 0 = Q2 /4 0ma3 monolayers [1], electrons on the surface of liquid helium [2], rare gas atoms ab- sorbed on graphite [3 a screened Coulomb repulsion or Yukawa potential. Sound waves, or phonons, in a 2D Yukawa lattice are well
Assisted Teleoperation Strategies for Aggressively Controlling a Robot Arm with 2D Input
Indiana University
Assisted Teleoperation Strategies for Aggressively Controlling a Robot Arm with 2D Input Erkang You,hauserk}@indiana.edu Abstract--This paper studies assisted teleoperation techniques for controlling a 6DOF robot arm using click, and overall satisfaction. I. INTRODUCTION Assisted teleoperation allows a user to operate a robot while
Dynamics and control of the system of a 2-D rigid circular cylinder and point vortices
Shashikanth, Banavara N.
Dynamics and control of the system of a 2-D rigid circular cylinder and point vortices Zhanhua Ma dynamically interacting with N point vortices in its vicinity [16] is an idealized example of coupled solid from a fluid mechanics viewpoint as well as a dynamics and control viewpoint. The problem has many
Thompson/Ocean 420/Winter 2004 2D waves 1 Two-dimensional wave propagation
Thompson, LuAnne
Thompson/Ocean 420/Winter 2004 2D waves 1 Two-dimensional wave propagation So far we have talked about wave propagation in one-dimension. For two or three spatial dimensions, we vectorize our ideas propagation. For surface waves, there is no vertical propagation, and we are only concerned with the two
Factorization of Darboux transformations of arbitrary order for 2D Schroedinger operators
Ekaterina Shemyakova
2015-05-04T23:59:59.000Z
We give a proof of Darboux's conjecture that every Darboux transformation of arbitrary order of a 2D Schroedinger type operator can be factorized into Darboux transformations of order one. The proof is constructive. The result is obtained in the framework of an algebraic approach to Darboux transformations which is suggested in this paper and is a further improvement of S. Tsarev's earlier idea.
Fayer, Michael D.
Hydrogen Bond Migration between Molecular Sites Observed with Ultrafast 2D IR Chemical ExchangeVed: January 12, 2010 Hydrogen-bonded complexes between phenol and phenylacetylene are studied using ultrafast hydrogen bonding acceptor sites (phenyl or acetylene) that compete for hydrogen bond donors in solution
Symmetry reduction and control of the dynamics of a 2-D rigid circular cylinder and a
Shashikanth, Banavara N.
Symmetry reduction and control of the dynamics of a 2-D rigid circular cylinder and a point vortex. This dynamic model is an idealized example in an inviscid framework of fully- coupled solid-fluid systems vortex, cylinder, optimal control, reduction, scat- tering #12;Contents 1 INTRODUCTION 4 2 The SMBK model
RENORMALIZED ENERGY EQUIDISTRIBUTION AND LOCAL CHARGE BALANCE IN 2D COULOMB SYSTEMS
RENORMALIZED ENERGY EQUIDISTRIBUTION AND LOCAL CHARGE BALANCE IN 2D COULOMB SYSTEMS SIMONA ROTA of the "Coulomb renormalized energy" of Sandier-Serfaty, which corresponds to the total Coulomb interaction point charges with Coulomb pair interaction, in a con- fining potential (minimizers of this energy also
Paris-Sud XI, Université de
Anaïs Wion 2d International Littmann Conference Jan. 2006, Aksum, Ethiopia PRE-PRINT The National Archives and Library of Ethiopia: six years of Ethio-French cooperation (2001-2006) Most scholars are aware traditions are a reality that should more often be discussed openly by the scholarly community. In Ethiopia
The svgl toolkit: enabling fast rendering of rich 2D graphics Stephane Conversy1,2
Paris-Sud XI, UniversitÃ© de
The svgl toolkit: enabling fast rendering of rich 2D graphics StÂ´ephane Conversy1,2 Jean powerful graphical processors be- come available on mainstream computers, it becomes possible , a graphical toolkit that enables programmers and design- ers of interactive applications to benefit from
2D Simultaneous Localization And Mapping for Micro Air Vehicles Adrien Angeli1
Paris-Sud XI, UniversitÃ© de
, heavy weight and high energy consumption. Instead, vision seems to be a good alternative: it is cheap2D Simultaneous Localization And Mapping for Micro Air Vehicles Adrien Angeli1 David Filliat2 St to shift from human-controlled aircrafts to partially-autonomous flying agents. Today, one of the main
Water Dynamics in Salt Solutions Studied with Ultrafast Two-Dimensional Infrared (2D IR)
Fayer, Michael D.
Water Dynamics in Salt Solutions Studied with Ultrafast Two-Dimensional Infrared (2D IR RECEIVED ON FEBRUARY 3, 2009 C O N S P E C T U S Water is ubiquitous in nature, but it exists as pure water infrequently. From the ocean to biology, water molecules interact with a wide variety of dissolved species
Definition RX Evaluate Kernels K-2d K-1d Change By definition undefined
Theiler, James
Definition RX Evaluate Kernels K-2d K-1d Change By def·i·ni·tion undefined Adventures in anomaly Alamos National Laboratory Research supported by the United States Department of Energy through the Los Alamos Laboratory Directed Research and Development (LDRD) Program. #12;Theiler LA-UR-14-24429 Definition
3D Shape from Silhouette Points in Registered 2D Images Using Conjugate Gradient Method
Hoff, William A.
3D Shape from Silhouette Points in Registered 2D Images Using Conjugate Gradient Method Andrzej version of the conjugate gradient method. We take advantage of the structure of the problem to make polynomial function. The approximate problem is solved using a nonlinear conjugate gradient solver that takes
LNG FEM: GENERATING GRADED MESHES AND SOLVING ELLIPTIC EQUATIONS ON 2-D DOMAINS OF POLYGONAL, Minnesota 55455Â0436 Phone: 612-624-6066 Fax: 612-626-7370 URL: http://www.ima.umn.edu #12;LNG FEM AND VICTOR NISTOR Abstract. We develop LNG FEM, a software package for graded mesh gen- eration
Estudio de la estabilidad de una familia de toros 2D del Problema Cuasibicircular
Barcelona, Universitat de
estabilidad est'a asociado al nacimiento de las familias de toros Halo 2D. Para este trabajo se han utilizado QBCP depende de ¯, el par'ametro de masas del sistema TierraLuna, a s , la distancia media del Sol al s \\Gamma 1 ' 328900:54 ; ! s = 0:925195985520347 ; tomando las unidades de masa, distancia y tiempo de
Collective Classification for Labeling of Places and Objects in 2D and 3D Range Data
Teschner, Matthias
these representations of the environment to improve the human- robot comunication. In this work, we present an approach information to 2D maps. Koenig and Simmons (1998) apply a pre-programmed routine to detect doorways. Althaus and Christensen (2003) use sonar data to detect corridors and doorways. Moreover, Friedman et al. (2007) introduce
Simulation of surface waves with porous boundaries in a 2-D numerical wave tank
Koo, Weoncheol
1999-01-01T23:59:59.000Z
are obtained for an arbitrary 2-D body. The boundary element method is then extended to the problem with porous boundaries. The flow inside porous medium is based on Darcy's rule. Analytic solutions are obtained for the flat porous bottom case and compared...
VISION-BASED CONTROL OF 2D PLANE POISEUILLE FLOW Romeo Tatsambon Fomena and Christophe Collewet
Paris-Sud XI, Université de
Cemagref, INRIA Rennes-Bretagne Atlantique and Universit´e Europ´eenne de Bretagne 17 avenue de Cucill in optimizing shapes or in choosing suitable surfacing. Conversely, in active con- trol an external energy the vision-based control approach to regulate the 2D plane Poiseuille flow around its steady state
Finite-element discretization of a linearized 2 -D model for lubricated oil transportation
Frey, Pascal
Finite-element discretization of a linearized 2 - D model for lubricated oil transportation V acts as a lubricant by coating the wall of the pipeline, thus preventing the oil from adhering is devoted to the numerical simulation of a linearized model for the lubricated trans- portation of heavy
Genetic Algorithm for Predicting Protein Folding in the 2D HP Model
Emmerich, Michael
Genetic Algorithm for Predicting Protein Folding in the 2D HP Model A Parameter Tuning Case Study of a protein, predicting its tertiary structure is known as the protein folding problem. This problem has been. The protein folding problem in the HP model is to find a conformation (a folded sequence) with the lowest
Ionwater hydrogen-bond switching observed with 2D IR vibrational echo chemical
Fayer, Michael D.
IonÂwater hydrogen-bond switching observed with 2D IR vibrational echo chemical exchange for review November 8, 2008) The exchange of water hydroxyl hydrogen bonds between anions and water oxygens of anionÂ water hydroxyl hydrogen bond switching under thermal equilib- rium conditions as Taw 7 1 ps. Pump
Neuroglobin dynamics observed with ultrafast 2D-IR vibrational echo spectroscopy
Fayer, Michael D.
Neuroglobin dynamics observed with ultrafast 2D-IR vibrational echo spectroscopy Haruto Ishikawa Contributed by Michael D. Fayer, August 15, 2007 (sent for review July 25, 2007) Neuroglobin (Ngb), a protein energy minimum. myoglobin mutants protein dynamics energy landscape Neuroglobin (Ngb) is a recently
Fayer, Michael D.
Size-dependent ultrafast structural dynamics inside phospholipid vesicle bilayers measured with 2D 25, 2013) The ultrafast structural dynamics inside the bilayers of dilauroyl- phosphatidylcholine was used as a vibrational probe and provided information on spectral diffusion (structural dynam- ics
2D control of field-driven magnetic bubble movement using Dzyaloshinskii-Moriya interactions
Petit, Dorothée; Seem, Peter R.; Tillette, Marine; Mansell, Rhodri; Cowburn, Russell P.
2015-01-12T23:59:59.000Z
. Fukushima and S. Yuasa, Nature Phys. 7, 626 (2011) 2D. A. Allwood, G. Xiong, C. C. Faulkner, D. Atkinson, D. Petit and R. P. Cowburn, Science 309, 1688 (2005) 3D. A. Allwood, G. Xiong, M. D. Cooke, C. C. Faulkner,D. Atkin- son, N. Vernier and R. P. Cowburn...
Creative Character Design Based on Combination of 2D and 3D Characteristics
Salimi Beni, Anahita
2014-12-09T23:59:59.000Z
This research combines the need for innovation in character design with the idea of combining 2D and 3D characteristics to create an original and appealing character style. The goal has been to benefit from the capabilities of 3D animation while...
Robust and Efficient Adaptive Moving Mesh Solution of the 2-D Euler equations
Zegeling, Paul
to track individual features of the physi- cal solutions, such as shocks and emerging instabilities [2] in which the difficult choice of a user-defined adaptivity constant in the monitor function lists our conclusions. 2 The 2D Euler equations The two-dimensional Euler equations of gas dynamics
GREIT: a unified approach to 2D linear EIT reconstruction of lung images
Adler, Andy
GREIT: a unified approach to 2D linear EIT reconstruction of lung images Andy Adler1 , John H the distribution of ventilation. However, most clinical and physiological research in lung EIT is done using older algorithm for lung EIT, called GREIT (Graz consensus Reconstruction algorithm for EIT). This paper describes
Paris-Sud XI, UniversitÃ© de
be observable. II. 2D GLASS-GLASS FOAM GEOMETRICAL VADEMECUM In the present section, we shall provide a geometri- cal description and some corresponding results for two- dimensional foams squeezed between two glass liquid foams Pierre Rognon, FranÂ¸cois Molino, and Cyprien Gay Centre de Recherche Paul Pascal, CNRS, UPR
Recanati, Catherine
be observable. II. 2D GLASS-GLASS FOAM GEOMETRICAL VADEMECUM In the present section, we shall provide a geometri- cal description and some corresponding results for two- dimensional foams squeezed between two glass liquid foams Pierre Rognon, Fran#24;cois Molino, and Cyprien Gay #3; Centre de Recherche Paul Pascal
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
Algebraic theory of crystal vibrations: Singularities and zeros in vibrations of 1D and 2D lattices
F. Iachello; B. Dietz; M. Miski-Oglu; A. Richter
2015-06-02T23:59:59.000Z
A novel method for the calculation of the energy dispersion relation (EDR) and density of states (DOS) in one (1D) and two (2D) dimensions is introduced and applied to linear lattices (1D) and square and hexagonal lattices (2D). The (van Hove) singularities and (Dirac) zeros of the DOS are discussed. Results for the 2D hexagonal lattice (graphene-like materials) are compared with experimental data in microwave photonic crystals.
Inversions in astronomy and the SOLA method
F. P. Pijpers
1995-06-14T23:59:59.000Z
This paper was presented at the Institute for Mathematics and its Applications workshop "Inverse problems in wave propagation" and will appear in the series IMA volumes (Springer). A brief overview of applications of inversions within astronomy is presented and also an inventory of techniques commonly in use. Most of this paper is focussed on the method of Subtractive Optimally Localized Averages (SOLA) which is an adaptation of the Backus and Gilbert method. This method was originally developed for use in helioseismology where the Backus and Gilbert method is computationally too slow. Since then it has also been applied to the problem of reverberation mapping of active galactic nuclei and the differences between this inverse problem and the ones of helioseismology are also discussed.
Error handling strategies in multiphase inverse modeling
Finsterle, S.; Zhang, Y.
2010-12-01T23:59:59.000Z
Parameter estimation by inverse modeling involves the repeated evaluation of a function of residuals. These residuals represent both errors in the model and errors in the data. In practical applications of inverse modeling of multiphase flow and transport, the error structure of the final residuals often significantly deviates from the statistical assumptions that underlie standard maximum likelihood estimation using the least-squares method. Large random or systematic errors are likely to lead to convergence problems, biased parameter estimates, misleading uncertainty measures, or poor predictive capabilities of the calibrated model. The multiphase inverse modeling code iTOUGH2 supports strategies that identify and mitigate the impact of systematic or non-normal error structures. We discuss these approaches and provide an overview of the error handling features implemented in iTOUGH2.
EFFECT OF JOINT AUDITOR PAIR ON CONSERVATISM
Paris-Sud XI, UniversitÃ© de
1 EFFECT OF JOINT AUDITOR PAIR ON CONSERVATISM: EVIDENCE FROM IMPAIRMENT TESTS Gerald Lobo's (1997) measure of conservatism, are more likely to book impairments when operating performance is low requiring joint audit to improve audit quality. Mots clÃ©s : Co-commissariat Â Reconnaissance adÃ©quate des
Joint Fuel Cell Bus Workshop Summary Report
Joint Fuel Cell Bus Workshop Summary Report Prepared for: U.S. Department of Energy (DOE/EERE) U was jointly sponsored by the Energy Efficiency and Renewable Energy office of the DOE and the Federal Transit the entire range of operating conditions and cycles Â· Cost (manufacturing, capital, operations
Wang, Yan
PhD) (Cotutelle) · 2010(MQRES) 2.252009 10% · 2010 · 1.8 1.32012 www.international.mq.edu.au/researchCRICOS Code 00002J " 2014 200 (COREs) " Jim Piper 20091600 (MQRES) (Cotutelle) (Joint PhD) MICHELLEWILSON 20102651 104(Cotutelle) (Joint PhD) #12; (COREs) (Ancient Cultures) -- (Animal Behaviour
Canonical vs Micro-Canonical Sampling Methods in a 2D Ising model1
Kepner, Jeremy
model. Expressions for the internal energy, U, inverse temperature, Z, and specific heat, C, are givenSj . (2) #12;2 A quantity of particular interest in our experiments is the internal energy, U. In terms and the energy, the canonical scheme for changing spins can best be explained by the following piece of pseudo-code
Luc Dessart; S. P. Owocki
2005-03-23T23:59:59.000Z
We present initial attempts to include the multi-dimensional nature of radiation transport in hydrodynamical simulations of the small-scale structure that arises from the line-driven instability in hot-star winds. Compared to previous 1D or 2D models that assume a purely radial radiation force, we seek additionally to treat the lateral momentum and transport of diffuse line-radiation, initially here within a 2D context. A key incentive is to study the damping effect of the associated diffuse line-drag on the dynamical properties of the flow, focusing particularly on whether this might prevent lateral break-up of shell structures at scales near the lateral Sobolev angle of ca. $1^{\\rm o}$. We first explore nonlinear simulations that cast the lateral diffuse force in the simple, local form of a parallel viscosity. Second, to account for the lateral mixing of radiation associated with the radial driving, we next explore models in which the radial force is azimuthally smoothed over a chosen scale. Third, to account for both the lateral line-drag and the lateral mixing in a more self-consistent way, we explore further a method first proposed by Owocki (1999), which uses a restricted 3-ray approach that combines a radial ray with two oblique rays set to have an impact parameter $p < R_{\\ast}$ within the stellar core. From numerical simulations, we find that, compared to equivalent 1-ray simulations, the high-resolution 3-ray models show systematically a much higher lateral coherence.... (Full abstract in paper)
United States and France Sign Joint Statement on Civil Liability...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
and France Sign Joint Statement on Civil Liability for Nuclear Damage United States and France Sign Joint Statement on Civil Liability for Nuclear Damage Joint Statement Signed.pdf...
GMC Collisions as Triggers of Star Formation. I. Parameter Space Exploration with 2D Simulations
Wu, Benjamin; Tan, Jonathan C; Bruderer, Simon
2015-01-01T23:59:59.000Z
We utilize magnetohydrodynamic (MHD) simulations to develop a numerical model for GMC-GMC collisions between nearly magnetically critical clouds. The goal is to determine if, and under what circumstances, cloud collisions can cause pre-existing magnetically subcritical clumps to become supercritical and undergo gravitational collapse. We first develop and implement new photodissociation region (PDR) based heating and cooling functions that span the atomic to molecular transition, creating a multiphase ISM and allowing modeling of non-equilibrium temperature structures. Then in 2D and with ideal MHD, we explore a wide parameter space of magnetic field strength, magnetic field geometry, collision velocity, and impact parameter, and compare isolated versus colliding clouds. We find factors of ~2-3 increase in mean clump density from typical collisions, with strong dependence on collision velocity and magnetic field strength, but ultimately limited by flux-freezing in 2D geometries. For geometries enabling flow a...
Solving the additive eigenvalue problem associated to a dynamics of a 2D-traffic system
Nadir Farhi
2009-08-25T23:59:59.000Z
This is a technical note where we solve the additive eigenvalue problem associated to a dynamics of a 2D-traffic system. The traffic modeling is not explained here. It is available in \\cite{Far08}. It consists of a microscopic road traffic model of two circular roads crossing on one junction managed with the priority-to-the-right rule. It is based on Petri nets and minplus algebra. One of our objectives in \\cite{Far08} was to derive the fundamental diagram of 2D-traffic, which is the relation between the density and the flow of vehicles. The dynamics of this system, derived from a Petri net design, is non monotone and additively homogeneous of degree 1. In this note, we solve the additive eigenvalue problem associated to this dynamics.
Neutrino masses and the number of neutrino species from WMAP and 2dFGRS
Steen Hannestad
2003-03-04T23:59:59.000Z
We have performed a thorough analysis of the constraints which can be put on neutrino parameters from cosmological observations, most notably those from the WMAP satellite and the 2dF galaxy survey. For this data we find an upper limit on the sum of active neutrino mass eigenstates of \\sum m_nu < 1.0 eV (95% conf.), but this limit is dependent on priors. We find that the WMAP and 2dF data alone cannot rule out the evidence from neutrinoless double beta decay reported by the Heidelberg-Moscow experiment. In terms of the relativistic energy density in neutrinos or other weakly interacting species we find, in units of the equivalent number of neutrino species, N_nu, that N_nu = 4.0+3.0-2.1 (95% conf.). When BBN constraints are added, the bound on N_\
2D electron temperature diagnostic using soft x-ray imaging technique
Nishimura, K., E-mail: nishim11@nuclear.es.kit.ac.jp; Sanpei, A., E-mail: sanpei@kit.ac.jp; Tanaka, H.; Ishii, G.; Kodera, R.; Ueba, R.; Himura, H.; Masamune, S. [Department of Electronics, Kyoto Institute of Technology, Kyoto 606-8585 (Japan)] [Department of Electronics, Kyoto Institute of Technology, Kyoto 606-8585 (Japan); Ohdachi, S.; Mizuguchi, N. [National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292 (Japan)] [National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292 (Japan)
2014-03-15T23:59:59.000Z
We have developed a two-dimensional (2D) electron temperature (T{sub e}) diagnostic system for thermal structure studies in a low-aspect-ratio reversed field pinch (RFP). The system consists of a soft x-ray (SXR) camera with two pin holes for two-kinds of absorber foils, combined with a high-speed camera. Two SXR images with almost the same viewing area are formed through different absorber foils on a single micro-channel plate (MCP). A 2D T{sub e} image can then be obtained by calculating the intensity ratio for each element of the images. We have succeeded in distinguishing T{sub e} image in quasi-single helicity (QSH) from that in multi-helicity (MH) RFP states, where the former is characterized by concentrated magnetic fluctuation spectrum and the latter, by broad spectrum of edge magnetic fluctuations.
The 2dF Galaxy Redshift Survey: Wiener Reconstruction of the Cosmic Web
Pirin Erdogdu; Ofer Lahav; Saleem Zaroubi; George Efstathiou; Steve Moody; John A. Peacock; Matthew Colless; Ivan K. Baldry; Carlton M. Baugh; Joss Bland-Hawthorn; Terry Bridges; Russell Cannon; Shaun Cole; Chris Collins; Warrick Couch; Gavin Dalton; Roberto De Propris; Simon P. Driver; Richard S. Ellis; Carlos S. Frenk; Karl Glazebrook; Carole Jackson; Ian Lewis; Stuart Lumsden; Steve Maddox; Darren Madgwick; Peder Norberg; Bruce A. Peterson; Will Sutherland; Keith Taylor
2003-12-19T23:59:59.000Z
We reconstruct the underlying density field of the 2 degree Field Galaxy Redshift Survey (2dFGRS) for the redshift range 0.035
Advances in Fast 2-D Camera Data Handling and Analysis on NSTX
Princeton Plasma Physics Laboratory
4.8 800x600 150 32x32 12 Photron Fastcam 750 1500 2.0 1024x1024 120 128x16 10 Miro 2 50 2000 1.2 800 turbulence in gas puffs · The propagation of ELMs and MARFEs · Heat loading on plasma facing components Advances in Fast 2D Cameras on NSTX. Davis. 5June 15-19, 2009 ELM formation with and without background
2D radiative modelling of He I spectral lines formed in solar prominences
L. Leger; F. Paletou
2008-07-11T23:59:59.000Z
We present preliminary results of 2D radiative modelling of He I lines in solar prominences, using a new numerical code developed by us (Leger, Chevallier and Paletou 2007). It treats self-consistently the radiation transfer and the non-LTE statistical equilibrium of H and, in a second stage, the one of He using a detailed atomic model. Preliminary comparisons with new visible plus near-infrared observations made at high spectral resolution with THeMIS are very satisfactory.
t s + t w m 2D Square Mesh with Wraparound
Zhang, Jun
t s + t w m 2D Square Mesh with Wraparound: 3.5 AlltoAll Personalized Communication 0 1 2 3 4 7 5 of the messages t s 3.5 AlltoAll Personalized Communication the alltoall broadcast on a hypercube 3.5 AlltoAll Personalized Communication ( t s + 1 2 t w ) mp ( p 1 ) 3.5.2. Cut
A New Proof on Net Upscale Energy Cascade in 2D and QG Turbulence
Eleftherios Gkioulekas; Ka Kit Tung
2006-09-30T23:59:59.000Z
A general proof that more energy flows upscale than downscale in two-dimensional (2D) turbulence and barotropic quasi-geostrophic (QG) turbulence is given. A proof is also given that in Surface QG turbulence, the reverse is true. Though some of these results are known in restricted cases, the proofs given here are pedagogically simpler, require fewer assumptions and apply to both forced and unforced cases.
Mass Splitting of Staggered Fermion and $SO(2D)$ Clifford Algebra
M. Hatakeyama; H. Sawanaka; H. So
2006-09-28T23:59:59.000Z
We present a new method to introduce rotationally invariant terms in staggered fermions which is based on an $SO(2D)$ Clifford algebra formulation, where $D$ means the number of space-time dimensions. We have four candidates for improved mass terms that can split the degenerate mass of staggered fermions. Among them, we analyze three types of combinations and find only one case that can identify with the light single Dirac mode.
Week 11 Notes, Math 8610, Tanveer 1. 2-D inviscid irrotional free boundary: Conformal
Tanveer, Saleh
in the absence of a body force, but in the presence of surface tension. Note that 2-D water waves may write it as g ImZ. We now derive the kinematic boundary condition. Since the free boundary is given)] = tZ + dZ d t Hence from (1.12), we obtain the kinematic condition to be equivalent to (1.14) Re - t
Progress In Electromagnetics Research C, Vol. 36, 119130, 2013 EXPERIMENTAL STUDY OF 2-D
Paris-Sud XI, UniversitÃ© de
substrate. 2-D cells are made with 1.6 mm thick FR4 substrate on the bottom and glass plate on the top separated by thin glass spacers. Here the cell size is 11 cm Ã? 3 cm Ã? 0.1 mm. A 2.6 mm wide cathode techniques consisting of metallized foams have been recently used to fabricate regular fractals [13, 14
Thomas Clerc; Alain Hébert; Hadrien Leroyer; Jean-Philippe Argaud; Bertrand Bouriquet; Agélique Ponçot
2014-05-12T23:59:59.000Z
This paper presents a computational scheme for the determination of equivalent 2D multi-group heterogeneous reflectors in a Pressurized Water Reactor (PWR). The proposed strategy is to define a full-core calculation consistent with a reference lattice code calculation such as the Method Of Characteristics (MOC) as implemented in APOLLO2 lattice code. The computational scheme presented here relies on the data assimilation module known as "Assimilation de donn\\'{e}es et Aide \\`{a} l'Optimisation (ADAO)" of the SALOME platform developed at \\'{E}lectricit\\'{e} De France (EDF), coupled with the full-core code COCAGNE and with the lattice code APOLLO2. A first validation of the computational scheme is made using the OPTEX reflector model developed at \\'{E}cole Polytechnique de Montr\\'{e}al (EPM). As a result, we obtain 2D multi-group, spatially heterogeneous 2D reflectors, using both diffusion or $\\text{SP}_{\\text{N}}$ operators. We observe important improvements of the power discrepancies distribution over the core when using reflectors computed with the proposed computational scheme, and the $\\text{SP}_{\\text{N}}$ operator enables additional improvements.
THE 2dF REDSHIFT SURVEY. I. PHYSICAL ASSOCIATION AND PERIODICITY IN QUASAR FAMILIES
Fulton, C. C. [School of Physics, University of Western Australia, 35 Stirling Highway, Crawley, 6009 WA (Australia); Arp, H. C., E-mail: chris.fulton@uwa.edu.au, E-mail: arp@mpa-garching.mpg.de [Max-Planck-Institut fuer Astrophysik, Karl Schwarzschild-Str. 1, Postfach 1317, D-85741 Garching (Germany)
2012-08-01T23:59:59.000Z
We have tested for physical association of candidate companion quasars with putative parent galaxies by virtue of Karlsson periodicity in quasar redshifts. We examined galaxies from the 2dF Galaxy Redshift Survey (2dFGRS) and quasars from the 2dF Quasar Redshift Survey (2QZ) in the two declination strips (at declinations 0 Degree-Sign and -30 Degree-Sign ) covered by the 2QZ, first filtering out galaxies and quasars using the respective survey masks and observation qualities as described, and using only quasars with z {>=} 0.5 to avoid the redshift region of mixed galaxies and quasars. Around each galaxy, quasars are detected as physically associated with a putative parent galaxy if their respective redshifts conform to empirically derived constraints based on an ejection hypothesis. We ran Monte Carlo control trials against the pure physical associations by replacing the actual redshifts of the candidate companion quasars with quasar redshifts drawn randomly from each respective right ascension hour. The constraints are grouping of quasar redshifts and Karlsson periodicity of quasar redshifts.
Clerc, Thomas; Leroyer, Hadrien; Argaud, Jean-Philippe; Bouriquet, Bertrand; Ponçot, Agélique
2014-01-01T23:59:59.000Z
This paper presents a computational scheme for the determination of equivalent 2D multi-group heterogeneous reflectors in a Pressurized Water Reactor (PWR). The proposed strategy is to define a full-core calculation consistent with a reference lattice code calculation such as the Method Of Characteristics (MOC) as implemented in APOLLO2 lattice code. The computational scheme presented here relies on the data assimilation module known as "Assimilation de donn\\'{e}es et Aide \\`{a} l'Optimisation (ADAO)" of the SALOME platform developed at \\'{E}lectricit\\'{e} De France (EDF), coupled with the full-core code COCAGNE and with the lattice code APOLLO2. A first validation of the computational scheme is made using the OPTEX reflector model developed at \\'{E}cole Polytechnique de Montr\\'{e}al (EPM). As a result, we obtain 2D multi-group, spatially heterogeneous 2D reflectors, using both diffusion or $\\text{SP}_{\\text{N}}$ operators. We observe important improvements of the power discrepancies distribution over the cor...
Dynamic Behavior of Multiple Inversions Senior Thesis
Popovic, Jovan
Dynamic Behavior of Multiple Inversions Ilya Baran Senior Thesis Boston University Academy Under functions. To iterate a function means to compose it with itself multiple times. Unless stated otherwise, we a circle centered at O with radius r is a point A 0 on the ray \\Gamma! OA such that OA r = r OA 0 (see
2, 413445, 2008 Surface inversion on
Boyer, Edmond
variations in surface flow velocity and topography along a flow line on ice streams and ice sheets of spatial variations in basal topography and basal slipperiness on surface data can be accurately separatedTCD 2, 413445, 2008 Surface inversion on ice streams G. H. Gudmundsson and M. Raymond Title Page
Wavelet Decomposition Approaches to Statistical Inverse Problems
Abramovich, Felix
Wavelet Decomposition Approaches to Statistical Inverse Problems BY F. ABRAMOVICH Department alternative is the waveletÂvaguelette decomposition method, based on the expansion of the unknown in wavelet series. In the vagueletteÂwavelet decomposition method proposed here, the observed data are expanded
INVERSION FOR APPLIED GEOPHYSICS: A TUTORIAL
Oldenburg, Douglas W.
INVERSION FOR APPLIED GEOPHYSICS: A TUTORIAL Douglas W. Oldenburg* and Yaoguo Li** * UBC-Geophysical, V6T 1Z4 ** Department of Geophysics, Colorado School of Mines, Golden, Colorado, 80401 INTRODUCTION Throughout this book there are numerous cases where geophysics has been used to help solve practical
Inverse Problems for Fractional Diffusion Equations
Zuo, Lihua
2013-06-21T23:59:59.000Z
and preliminaries in Section 1 and 2, in the third section we consider our first inverse boundary problem. This is where an unknown boundary condition is to be determined from overposed data in a time- fractional diffusion equation. Based upon the fundamental...
Focusing Inversion of Electroencephalography and Magnetoencephalography Data
Utah, University of
or magnetic #12;eld recorded outside of the head. In this paper, we present a new minimization technique to the inverse bioelectric and biomagnetic #12;eld problems are functional brain studies and clinical diagnosis of neural disease, such as epilepsy. In functional brain studies, sensory signals stimulate the subject
Approximating Human Reaching Volumes Using Inverse Kinematics
Rodríguez, Inmaculada
of reach: standing reach, which is useful in computer animation where virtual humans have to interact. Introduction Virtual Humans are a valuable medium for gaining knowledge and understanding about the human bodyApproximating Human Reaching Volumes Using Inverse Kinematics I. Rodrígueza , M. Peinadoa , R
Global optimization in inverse problem of scatterometry
Paris-Sud XI, UniversitÃ© de
Global optimization in inverse problem of scatterometry Lekbir Afraites1,2 Jerome Hazard3 Patrick as a parametric optimization problem using the Least Square criterion. In this work, a design procedure for global robust optimization is developed using Kriging and global optimization approaches. Robustness
Joint Statement on the Global Nuclear Energy Partnership and...
Office of Environmental Management (EM)
Joint Statement on the Global Nuclear Energy Partnership and Nuclear Energy Cooperation Joint Statement on the Global Nuclear Energy Partnership and Nuclear Energy Cooperation...
acute prosthetic joint: Topics by E-print Network
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acute neuropathic joint: Topics by E-print Network
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anatomical joint angles: Topics by E-print Network
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atlanto-axial joint: Topics by E-print Network
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aa6056 butt joints: Topics by E-print Network
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acute acromioclavicular joint: Topics by E-print Network
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In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations 20 Joint Degrees & Promotion towards European Students Computer...
assessing rheumatic joint: Topics by E-print Network
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In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations 46 Joint Degrees & Promotion towards European Students Computer...
artificial joint replacements: Topics by E-print Network
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In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations 152 Joint Degrees & Promotion towards European Students Computer...
adhesive lap joints: Topics by E-print Network
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agu joint assembly: Topics by E-print Network
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total chip-eluted DNA. unknown authors 465 READY FOR TODAY. PREPARING FOR TOMORROW. The Joint Operating Environment is intended to inform joint concept Mathematics Websites...
ankle joint mobility: Topics by E-print Network
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In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations 214 Joint Degrees & Promotion towards European Students Computer...
adhesive bonded joints: Topics by E-print Network
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acromioclavicular joint reconstruction: Topics by E-print Network
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alloy butt joints: Topics by E-print Network
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arthritis wrist joints: Topics by E-print Network
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arthritis metacarpophalangeal joints: Topics by E-print Network
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animals jointly organized: Topics by E-print Network
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anticorrosive field joint: Topics by E-print Network
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In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations 48 Joint Degrees & Promotion towards European Students Computer...
atopic eczema joint: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations 38 Joint Degrees & Promotion towards European Students Computer...
ankle joint position: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations 205 Joint Degrees & Promotion towards European Students Computer...
adhesively bonded joints: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations 153 Joint Degrees & Promotion towards European Students Computer...
articular process joints: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations 146 Joint Degrees & Promotion towards European Students Computer...
atlanto-occipital joint: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations 15 Joint Degrees & Promotion towards European Students Computer...
Joint Institute for Neutron Sciences | ornl.gov
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Joint Institute for Neutron Sciences SHARE Joint Institute for Neutron Sciences JINS is located on Chestnut Ridge within the 80-acre SNS site, part of Oak Ridge National...
New Report Describes Joint Opportunities for Natural Gas and...
Office of Environmental Management (EM)
New Report Describes Joint Opportunities for Natural Gas and Hydrogen Fuel Cell Vehicle Markets New Report Describes Joint Opportunities for Natural Gas and Hydrogen Fuel Cell...
Sandia National Laboratories: New Report Describes Joint Opportunities...
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bilitiesCapabilitiesNew Report Describes Joint Opportunities for Natural Gas and Hydrogen Fuel-Cell Vehicle Markets New Report Describes Joint Opportunities for Natural Gas and...
Phosphine oxide derivatives as hosts for blue phosphors: A joint...
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oxide derivatives as hosts for blue phosphors: A joint theoretical and experimental study of their electronic Phosphine oxide derivatives as hosts for blue phosphors: A joint...
OMB and CEQ Joint Memorandum on Environmental Collaboration and...
Broader source: Energy.gov (indexed) [DOE]
Joint Memorandum on Environmental Collaboration and Conflict Resolution This Office of Management and Budget (OMB) and Council on Environmental Quality (CEQ) joint memorandum...
National Report Joint Convention on the Safety of Spent Fuel...
Office of Environmental Management (EM)
National Report Joint Convention on the Safety of Spent Fuel Management and on the Safety of Radioactive Waste Management National Report Joint Convention on the Safety of Spent...
application driven joint: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
This applica- tion is particularly challenging due to its demand for multiple concurrent media Smith, Jonathan M. 60 JOINT SEMINAR FINAL REPORT Mathematics Websites Summary: JOINT...
Sealed joint structure for electrochemical device
Tucker, Michael C; Jacobson, Craig P; De Jonghe, Lutgard C; Visco, Steven J
2013-05-21T23:59:59.000Z
Several members make up a joint in a high-temperature electrochemical device, wherein the various members perform different functions. The joint is useful for joining multiple cells (generally tubular modules) of an electrochemical device to produce a multi-cell segment-in-series stack for a solid oxide fuel cell, for instance. The joint includes sections that bond the joining members to each other; one or more seal sections that provide gas-tightness, and sections providing electrical connection and/or electrical insulation between the various joining members. A suitable joint configuration for an electrochemical device has a metal joint housing, a first porous electrode, a second porous electrode, separated from the first porous electrode by a solid electrolyte, and an insulating member disposed between the metal joint housing and the electrolyte and second electrode. One or more brazes structurally and electrically connects the first electrode to the metal joint housing and forms a gas tight seal between the first electrode and the second electrode.
Bruneau, Steve
in Pack Ice Roelof C. Dragt Offshore Engineering Faculty of Mechanical, Maritime and Material Engineering of experiments to validate a Graphics Processing Unit based numerical modelling of ship operations in 2D pack ice interaction, 2D Model Experiments, Image Processing. I. INTRODUCTION A ship travelling through pack ice
Simulating the FTICR-MS Signal of a Decaying Beryllium-7 Ion Plasma in a 2D Electrostatic PIC Code
Hart, Gus
Simulating the FTICR-MS Signal of a Decaying Beryllium-7 Ion Plasma in a 2D Electrostatic PIC Code the FTICR-MS Signal of a Decaying Beryllium-7 Ion Plasma in a 2D Electrostatic PIC Code Michael Takeshi Nakata Department of Physics and Astronomy Doctor of Philosophy Beryllium-7 (Be-7) only decays
A fast multipole boundary element method for 2D viscoelastic problems X.Y. Zhu a,d
Liu, Yijun
A fast multipole boundary element method for 2D viscoelastic problems X.Y. Zhu a,d , W.Q. Chen b Available online 21 August 2010 Keywords: Boundary element method Fast multipole method Viscoelasticity Multi-inclusion composite a b s t r a c t A fast multipole formulation for 2D linear viscoelastic
Finger length ratio (2D:4D) and sex differences in aggression during a simulated war game
Cosmides, Leda
Finger length ratio (2D:4D) and sex differences in aggression during a simulated war game Matthew H), and unprovoked attack during a simulated war game (n = 176). We also investigated whether 2D:4D mediated; Narcissism, social dominance orientation; Stress; Self-esteem; Aggression; War 0191-8869/$ - see front matter
Iglesia, Enrique
Kinetically Relevant Steps and H2/D2 Isotope Effects in Fischer-Tropsch Synthesis on Fe and CoVed: August 4, 2010; ReVised Manuscript ReceiVed: October 3, 2010 H2/D2 isotope effects on Fischer-Tropsch by theory and experiment for the specific case of CO hydrogenation. 1. Introduction Fischer-Tropsch
ccsd-00005538,version2-12Nov2005 Observation of Phase Defects in Quasi-2D Bose-Einstein Condensates
Boyer, Edmond
ccsd-00005538,version2-12Nov2005 Observation of Phase Defects in Quasi-2D Bose-Einstein Condensates in quasi-2D Bose-Einstein condensates close to the condensation temperature. Either a single or several equally spaced condensates are produced by selectively evaporating the sites of a 1D optical lattice. When
Cerveny, Vlastislav
Lyapunov exponents for 2-D ray tracing without interfaces Ludek Klimes , Department of Geophysics, Charles University, Prague, Czech Republic Summary The Lyapunov exponents asymptotically quantify the ex- ponential divergence of rays. The \\Lyapunov exponent" for a nite 2-D ray and the average \\Lyapunov exponents
A novel 2D coordination polymer based on a copper(II) tetramer with p-sulfonated thiacalix[4]arene
Gao, Song
A novel 2D coordination polymer based on a copper(II) tetramer with p-sulfonated thiacalix[4]arene and sulfato-bridged Cu(II) tetramer coor- dinating to fully deprotonated p-sulfonated thiacalix[4]arene.V. All rights reserved. Keywords: Crystal structure; 2D Coordination polymer; Copper tetramer; p
Recanati, Catherine
Note and calculations concerning elastic dilatancy in 2D glassÂglass liquid foams Franâ?ºcois Molino: October 30, 2010) When deformed, liquid foams tend to raise their liquid contents like immersed granular dilatancy in 3D foams and in very dry foams squeezed between two solid plates (2D GG foams). Here, we
INSPECTION OF FUSION JOINTS IN PLASTIC PIPE
Alex Savitski; Connie Reichert; John Coffey
2005-07-13T23:59:59.000Z
The standard method of joining plastic pipe in the field is the butt fusion process. As in any pipeline application, joint quality greatly affects overall operational safety of the system. Currently no simple, reliable, cost effective method of assessing the quality of fusion joints in the field exists. Visual examination and pressure testing are current non-destructive approaches, which do not provide any assurance about the long-term pipeline performance. This project will develop, demonstrate, and validate an in-situ non-destructive inspection method for butt fusion joints in gas distribution plastic pipelines. The inspection system will include a laser based image-recognition system that will automatically generate and interpret digital images of pipe joints and assign them a pass/fail rating, which eliminates operator bias in evaluating joint quality. A Weld Zone Inspection Method (WZIM) is being developed in which local heat is applied to the joint region to relax the residual stresses formed by the original joining operation and reveal the surface condition of the joint. In cases where the joint is not formed under optimal conditions, and the intermolecular forces between contacting surfaces are not strong enough, the relaxation of macromolecules in the surface layer causes the material to pull back, revealing a fusion line. If the joint is sound, the bond line image does not develop. To establish initial feasibility of the approach, welds were performed under standard and nonstandard conditions. These welds were subjected to the WZIM and tensile testing. There appears to be a direct correlation between the WZIM and tensile testing results. Although WZIM appears to be more sensitive than tensile testing can verify, the approach appears valid.
INSPECTION OF FUSION JOINTS IN PLASTIC PIPE
Alex Savitski; Connie Reichert; John Coffey
2004-07-13T23:59:59.000Z
The standard method of joining plastic pipe in the field is the butt fusion process. As in any pipeline application, joint quality greatly affects overall operational safety of the system. Currently no simple, reliable, cost effective method of assessing the quality of fusion joints in the field exists. Visual examination and pressure testing are current non-destructive approaches, which do not provide any assurance about the long-term pipeline performance. This project will develop, demonstrate, and validate an in-situ non-destructive inspection method for butt fusion joints in gas distribution plastic pipelines. The inspection system will include a laser based image-recognition system that will automatically generate and interpret digital images of pipe joints and assign them a pass/fail rating, which eliminates operator bias in evaluating joint quality. A Weld Zone Inspection Method (WZIM) is being developed in which local heat is applied to the joint region to relax the residual stresses formed by the original joining operation and reveal the surface condition of the joint. In cases where the joint is not formed under optimal conditions, and the intermolecular forces between contacting surfaces are not strong enough, the relaxation of macromolecules in the surface layer causes the material to pull back, revealing a fusion line. If the joint is sound, the bond line image does not develop. To establish initial feasibility of the approach, welds were performed under standard and non-standard conditions. These welds were subjected to the WZIM and tensile testing. There appears to be a direct correlation between the WZIM and tensile testing results. Although WZIM appears to be more sensitive than tensile testing can verify, the approach appears valid.
Inspection of Fusion Joints in Plastic Pipe
Connie Reichert
2005-09-01T23:59:59.000Z
The standard method of joining plastic pipe in the field is the butt fusion process. As in any pipeline application, joint quality greatly affects overall operational safety of the system. Currently no simple, reliable, cost-effective method exists for assessing the quality of fusion joints in the field. Visual examination and pressure testing are current nondestructive approaches, which do not provide any assurance about the long-term pipeline performance. This project developed, demonstrated, and validated an in-situ nondestructive inspection method for butt fusion joints in gas distribution plastic pipelines. The inspection system includes a laser-based image-recognition system that automatically generates and interprets digital images of pipe joints and assigns them a pass/fail rating, which eliminates operator bias in evaluating joint quality. An EWI-patented process, the Weld Zone Inspection Method (WZIM) was developed in which local heat is applied to the joint region to relax the residual stresses formed by the original joining operation, which reveals the surface condition of the joint. In cases where the joint is not formed under optimal conditions, and the intermolecular forces between contacting surfaces are not strong enough, the relaxation of macromolecules in the surface layer causes the material to pull back, revealing a fusion line. If the joint is sound, the bond line image does not develop. To establish initial feasibility of the approach, welds were performed under standard and nonstandard conditions. These welds were subjected to the WZIM and two destructive forms of testing: short-term tensile testing and long-term creep rupture testing. There appears to be a direct correlation between the WZIM and the destructive testing results. Although WZIM appears to be more sensitive than destructive testing can verify, the approach appears valid.
Riaud, Antoine; Charron, Eric; Bussonnière, Adrien; Matar, Olivier Bou
2015-01-01T23:59:59.000Z
From radio-electronics signal analysis to biological samples actuation, surface acoustic waves (SAW) are involved in a multitude of modern devices. Despite this versatility, SAW transducers developed up to date only authorize the synthesis of the most simple standing or progressive waves such as plane and focused waves. In particular, acoustical integrated sources able to generate acoustical vortices (the analogue of optical vortices) are missing. In this work, we propose a flexible tool based on inverse filter technique and arrays of SAW transducers enabling the synthesis of prescribed complex wave patterns at the surface of anisotropic media. The potential of this setup is illustrated by the synthesis of a 2D analog of 3D acoustical vortices, namely "swirling surface acoustic waves". Similarly to their 3D counterpart, they appear as concentric structures of bright rings with a phase singularity in their center resulting in a central dark spot. Swirling SAW can be useful in fragile sensors whose neighborhood...
Westerly, David C. [Department of Radiation Oncology, University of Colorado School of Medicine, Aurora, Colorado 80045 (United States); Mo Xiaohu; DeLuca, Paul M. Jr. [Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin 53705 (United States); Tome, Wolfgang A. [Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin 53705 and Institute of Onco-Physics, Albert Einstein College of Medicine and Division of Medical Physics, Department of Radiation Oncology, Montefiore Medical Center, Bronx, New York 10461 (United States); Mackie, Thomas R. [Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin 53705 and Department of Human Oncology, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin 53792 (United States)
2013-06-15T23:59:59.000Z
Purpose: Pencil beam algorithms are commonly used for proton therapy dose calculations. Szymanowski and Oelfke ['Two-dimensional pencil beam scaling: An improved proton dose algorithm for heterogeneous media,' Phys. Med. Biol. 47, 3313-3330 (2002)] developed a two-dimensional (2D) scaling algorithm which accurately models the radial pencil beam width as a function of depth in heterogeneous slab geometries using a scaled expression for the radial kernel width in water as a function of depth and kinetic energy. However, an assumption made in the derivation of the technique limits its range of validity to cases where the input expression for the radial kernel width in water is derived from a local scattering power model. The goal of this work is to derive a generalized form of 2D pencil beam scaling that is independent of the scattering power model and appropriate for use with any expression for the radial kernel width in water as a function of depth. Methods: Using Fermi-Eyges transport theory, the authors derive an expression for the radial pencil beam width in heterogeneous slab geometries which is independent of the proton scattering power and related quantities. The authors then perform test calculations in homogeneous and heterogeneous slab phantoms using both the original 2D scaling model and the new model with expressions for the radial kernel width in water computed from both local and nonlocal scattering power models, as well as a nonlocal parameterization of Moliere scattering theory. In addition to kernel width calculations, dose calculations are also performed for a narrow Gaussian proton beam. Results: Pencil beam width calculations indicate that both 2D scaling formalisms perform well when the radial kernel width in water is derived from a local scattering power model. Computing the radial kernel width from a nonlocal scattering model results in the local 2D scaling formula under-predicting the pencil beam width by as much as 1.4 mm (21%) at the depth of the Bragg peak for a 220 MeV proton beam in homogeneous water. This translates into a 32% dose discrepancy for a 5 mm Gaussian proton beam. Similar trends were observed for calculations made in heterogeneous slab phantoms where it was also noted that errors tend to increase with greater beam penetration. The generalized 2D scaling model performs well in all situations, with a maximum dose error of 0.3% at the Bragg peak in a heterogeneous phantom containing 3 cm of hard bone. Conclusions: The authors have derived a generalized form of 2D pencil beam scaling which is independent of the proton scattering power model and robust to the functional form of the radial kernel width in water used for the calculations. Sample calculations made with this model show excellent agreement with expected values in both homogeneous water and heterogeneous phantoms.
Inverse modeling of partitioning interwell tracer tests: A streamline approach
Datta-Gupta, Akhil
computations, inverse modeling 1. Introduction [2] It is recognized that the presence of nonaqueous phaseInverse modeling of partitioning interwell tracer tests: A streamline approach Akhil Datta orders of magnitude. INDEX TERMS: 1832 Hydrology: Groundwater transport; 1829 Hydrology: Groundwater
Lin, Youzuo [Los Alamos National Laboratory; Huang, Lianjie [Los Alamos National Laboratory; Zhang, Zhigang [Los Alamos National Laboratory
2011-01-01T23:59:59.000Z
Double-difference waveform inversion is a promising tool for quantitative monitoring for enhanced geothermal systems (EGS). The method uses time-lapse seismic data to jointly inverts for reservoir changes. Due to the ill-posedness of waveform inversion, it is a great challenge to obtain reservoir changes accurately and efficiently, particularly when using timelapse seismic reflection data. To improve reconstruction, we develop a spatially-variant total-variation regularization scheme into double-difference waveform inversion to improve the inversion accuracy and robustness. The new regularization scheme employs different regularization parameters in different regions of the model to obtain an optimal regularization in each area. We compare the results obtained using a spatially-variant parameter with those obtained using a constant regularization parameter. Utilizing a spatially-variant regularization scheme, the target monitoring regions are well reconstructed and the image noise is significantly reduced outside the monitoring regions. Our numerical examples demonstrate that the spatially-variant total-variation regularization scheme provides the flexibility to regularize local regions based on the a priori spatial information without increasing computational costs and the computer memory requirement.
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
The Joint Cascade of Energy and Helicity in Three-Dimensional Turbulence
Qiaoning Chen; Shiyi Chen; Gregory L. Eyink
2002-06-18T23:59:59.000Z
Three-dimensional (3D) turbulence has both energy and helicity as inviscid constants of motion. In contrast to two-dimensional (2D) turbulence, where a second inviscid invariant--the enstrophy--blocks the energy cascade to small scales, in 3D there is a joint cascade of both energy and helicity simultaneously to small scales. The basic cancellation mechanism which permits a joint cascade of energy and helicity is illuminated by means of the helical decomposition of the velocity into positively and negatively polarized waves. This decomposition is employed in the present study both theoretically and also in a numerical simulation of homogeneous and isotropic 3D turbulence. It is shown that the transfer of energy to small scales produces a tremendous growth of helicity separately in the + and - helical modes at high wavenumbers, diverging in the limit of infinite Reynolds number. However, because of a tendency to restore reflection invariance at small scales, the net helicity from both modes remains finite in that limit. The net helicity flux is shown to be constant all the way up to the Kolmogorov wavenumber: there is no shorter inertial-range for helicity cascade than for energy cascade. The transfer of energy and helicity between + and - modes, which permits the joint cascade, is shown to be due to two distinct physical processes, advection and vortex stretching.
Fractal Inverse Problem: Approximation Formulation and Differential Methods
GuÃ©rin, Eric
Fractal Inverse Problem: Approximation Formulation and Differential Methods Â´Eric GuÂ´erin1 Introduction 1.1 Fractal Inverse Problem The fractal inverse problem is an important research area with a great number of potential application fields. It consists in finding a fractal model or code that generates
Parallel matrix inversion for the revised simplex method -A study
Hall, Julian
Parallel matrix inversion for the revised simplex method - A study Julian Hall School of Mathematics University of Edinburgh June 15th 2006 Parallel matrix inversion for the revised simplex method - a study #12;Overview · Nature of the challenge of matrix inversion for the revised simplex method #12
Parallel matrix inversion for the revised simplex method -A study
Hall, Julian
Parallel matrix inversion for the revised simplex method - A study Julian Hall School of Mathematics University of Edinburgh June 15th 2006 Parallel matrix inversion for the revised simplex method - a study #12;Overview · Nature of the challenge of matrix inversion for the revised simplex method
Experimental Observation of Femtosecond Electron Beam Microbunching by Inverse
Brookhaven National Laboratory
Experimental Observation of Femtosecond Electron Beam Microbunching by Inverse FreeElectronLaser scale of ß 2.5 ¯m by an Inverse Free Electron Laser (IFEL) accelerator was observed. The optimum Cerenkov accelerator (ICA)[5], inverse free electron laser (IFEL) [6] and plasma laser accelerators [7, 8
LITHOLOGY-FLUID INVERSION FROM PRESTACK SEISMIC DATA
Eidsvik, Jo
LITHOLOGY-FLUID INVERSION FROM PRESTACK SEISMIC DATA MARIT ULVMOEN Department of Mathematical of the study is on lithology-fluid inversion from prestack seismic data in a 3D reservoir. The inversion relates the lithology-fluid classes to elastic variables and the seismic data, and it follows the lines
OXFORD UNIVERSITY JOINT COMMITTEE FOR MATHEMATICS AND
OXFORD UNIVERSITY JOINT COMMITTEE FOR MATHEMATICS AND PHILOSOPHY October 2014 Programme: for Mathematics, Statistics and Operational Research, and for Philosophy. http Â· to provide, within the supportive and stimulating environment of the collegiate university, a course
Safety Monitor Joint Working Group (JWG) Tour
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
4 th Meeting of the Joint Working Group of the U.S.-Japan Coordinating Committee of Fusion Energy on Safety in Inter-Institutional Collaborations (U.S.-Japan Safety Monitoring...
Joint Actinide Shock Physics Experimental Research - JASPER
None
2015-01-09T23:59:59.000Z
Commonly known as JASPER the Joint Actinide Shock Physics Experimental Research facility is a two stage light gas gun used to study the behavior of plutonium and other materials under high pressures, temperatures, and strain rates.
Joint microseismic event location with uncertain velocity
Poliannikov, Oleg V.
2013-01-01T23:59:59.000Z
We study the problem of the joint location of seismic events using an array of receivers. We show that locating multiple seismic events simultaneously is advantageous compared to the more traditional approaches of locating ...
2015 Joint Capability Technology Demonstration Industry Day
Broader source: Energy.gov [DOE]
The Smart Power Infrastructure Demonstration for Energy Reliability and Security (SPIDERS) Joint Capability Technology Demonstration (JCTD) Phase 3 Industry Day will be on August 27, 2015, from 8 a.m. to noon at the Hawaii Convention Center.
Joint Actinide Shock Physics Experimental Research - JASPER
None
2014-10-31T23:59:59.000Z
Commonly known as JASPER the Joint Actinide Shock Physics Experimental Research facility is a two stage light gas gun used to study the behavior of plutonium and other materials under high pressures, temperatures, and strain rates.
Joint Genome Institute's Automation Approach and History
Roberts, Simon
2006-07-05T23:59:59.000Z
Department of Energy/Joint Genome Institute (DOE/JGI) collaborates with DOE national laboratories and community users, to advance genome science in support of the DOE missions of clean bio-energy, carbon cycling, and bioremediation.
SPIDERS Joint Capability Technology Demonstration Industry Day
Broader source: Energy.gov [DOE]
The Smart Power Infrastructure Demonstration for Energy Reliability and Security (SPIDERS) Joint Capability Technology Demonstration (JCTD) Industry Day occurred April 22, 2014, from 8 a.m. to 1:30 p.m. at Fort Carson, Colorado.
CHARACTERIZATION OF DAMPING IN BOLTED LAP JOINTS
C. MALONEY; D. PEAIRS; ET AL
2000-08-01T23:59:59.000Z
The dynamic response of a jointed beam was measured in laboratory experiments. The data were analyzed and the system was mathematically modeled to establish plausible representations of joint damping behavior. Damping is examined in an approximate, local linear framework using log decrement and half power bandwidth approaches. in addition, damping is modeled in a nonlinear framework using a hybrid surface irregularities model that employs a bristles-construct. Experimental and analytical results are presented.
Feature selection for automatic solder joint inspection
Lee, Cheng-Cheng
1987-01-01T23:59:59.000Z
- heating Wave Soldering Drag Soldering Post- soldering Cleaning Inspection and Testing Vapor So Ide ring Fig. 2. 3 Typical Soldering Process 12 (5) simplicity of repair, (6) visual inspectability. The first three properties depend upon both.../testing after the soldering. Good joints after inspection can be sent to the testing process directly, while bad joints should be returned to be touched up by the operator. The types of test depend upon the product. For a typical PC board, electrical test...
Equation of state and helioseismic inversions
Sarbani Basu; J. Christensen-Dalsgaard
1997-02-19T23:59:59.000Z
Inversions to determine the squared isothermal sound speed and density within the Sun often use the helium abundance Y as the second parameter. This requires the explicit use of the equation of state (EOS), thus potentially leading to systematic errors in the results if the equations of state of the reference model and the Sun are not the same. We demonstrate how this potential error can be suppressed. We also show that it is possible to invert for the intrinsic difference in the adiabatic exponent Gamma_1 between two equations of state. When applied to solar data such inversion rules out the EFF equation of state completely, while with existing data it is difficult to distinguish between other equations of state.
The Product Form of the Inverse
Ward, Everett Bascomb
1966-01-01T23:59:59.000Z
the equations as follows: 19 s(1) X2 = El A2, or 0 0 1 2 1 1 0 0 0 1 v = Lo, 3, 0], and E (&) 2 1 0 0 0 ? 0 1 3 I 0 0 1 the inverse A2 of the new matrix A2 is computed. as follows: A -1 Es(2)A -1 Es(2)Es(1) 2 2 1 2 1 or ? -1 A2 1 0 0 0 ? 0.... column vector v of the elementary matrix E 3 is given by the equation of (2, 16 i as v = [-l, p, 2j, 1 1 thus Es{3) 3 0 -1 1 1 0 1 2 Therefore, the inverse A of A is computed by the equation -1 of (2. 10) as follows: A-1 = A -1 ? Es( A -1 Es(3...
Regularity of mappings inverse to Sobolev mappings
Vodop'yanov, Sergei K [S.L. Sobolev Institute for Mathematics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk (Russian Federation)
2012-10-31T23:59:59.000Z
For homeomorphisms {phi}:{Omega}{yields}{Omega}' on Euclidean domains in R{sup n}, n{>=}2, necessary and sufficient conditions ensuring that the inverse mapping belongs to a Sobolev class are investigated. The result obtained is used to describe a new two-index scale of homeomorphisms in some Sobolev class such that their inverses also form a two-index scale of mappings, in another Sobolev class. This scale involves quasiconformal mappings and also homeomorphisms in the Sobolev class W{sup 1}{sub n-1} such that rankD{phi}(x){<=}n-2 almost everywhere on the zero set of the Jacobian det D{phi}(x). Bibliography: 65 titles.
Seismic velocity inversion by differential semblance optimization
Gockenbach, M.; Symes, W.; Tapia, R.
1994-12-31T23:59:59.000Z
Differential Semblance Optimization (DSO) is a novel way of approaching certain inverse problems that arise in exploration seismology. The standard method of formulating these inverse problems -- Output Least-Squares (OLS) -- leads to a highly nonconvex objective function and therefore to a global optimization problem. The OLS problem can be rewritten as a partially linear least-squares problem with linear constraints, with the DSO objective function derived from the quadratic penalty function for this problem. It is shown that, because of the nature of the operators in this problem, the penalty function leads to a globalization procedure: for suitably small values of the penalty parameter, the global minimum of the DSO objective function can be found using local optimization techniques. There is then a path of minimizers, parameterized by the penalty constant, leading to the solution of the OLS problem.
Numerical studies of the melting transition in 2D Yukawa systems
Hartmann, P.; Donko, Z. [Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 49 (Hungary); Kalman, G. J. [Department of Physics, Boston College, Chestnut Hill, MA 02467 (United States)
2008-09-07T23:59:59.000Z
We present the latest results of our systematic studies of the solid--liquid phase transition in 2D classical many-particle systems interacting with the Yukawa potential. Our previous work is extended by applying the molecular dynamic simulations to systems with up to 1.6 million particles in the computational box (for {kappa} = 2 case). Equilibrium simulations are performed for different coupling parameters in the vicinity of the expected melting transition ({gamma}{sub m}{sup {kappa}}{sup ={sup 2}}{approx_equal}415) and a wide range of observables are averaged over uncorrelated samples of the micro-canonical ensemble generated by the simulations.
Determining finite volume elements for the 2D Navier-Stokes equations
Jones, D.A. (California Univ., Irvine, CA (United States). Dept. of Mathematics); Titi, E.S. (California Univ., Irvine, CA (United States). Dept. of Mathematics Cornell Univ., Ithaca, NY (United States). Mathematical Sciences Inst.)
1991-01-01T23:59:59.000Z
We consider the 2D Navier-Stokes equations on a square with periodic boundary conditions. Dividing the square into N equal subsquares, we show that if the asymptotic behavior of the average of solutions on these subsquares (finite volume elements) is known, then the large time behavior of the solution itself is completely determined, provided N is large enough. We also establish a rigorous upper bound for N needed to determine the solutions to the Navier-Stokes equation in terms of the physical parameters of the problem. 34 refs.
IR Renormalisation of General Effective Actions and Hawking Flux in 2D Gravity Theories
D. Hofmann; W. Kummer
2005-12-29T23:59:59.000Z
The infrared problem of the effective action in 2D is discussed in the framework of the Covariant Perturbation Theory. The divergences are regularised by a mass and the leading term is evaluated up to the third order of perturbation theory. A summation scheme is proposed which isolates the divergences from the finite part of the series and results in a single term. The latter turns out to be equivalent to the coupling to a certain classical external field. This suggests a renormalisation by factorisation.
2D Schrödinger Equation with Mixed Potential in Noncommutaive Complex space
Slimane Zaim; Hakim Guelmamene; Abdelkader Bahache
2014-10-01T23:59:59.000Z
We obtain exact solutions of the 2D Schr\\"odinger equation for Hydrogen atom with the lenear and Harmonic Potentials in noncommutative complex space, using the Power-series expansion method. Hence we can say that the Schr\\"odinger equation in noncommutative complex space describes to the particles with spin (1/2)in an external uniform magnitic field. Where the noncommutativity play the role of magnetic field with created the total magnetic moment of particle with spin 1/2, who in turn shifted the spectrum of energy. Such effects are similar to the Zeeman splitting in a commutative space.
Interference pattern of Bose-condensed gas in a 2D optical lattice
Shujuan Liu; Hongwei Xiong; Zhijun Xu; Guoxiang Huang
2003-04-25T23:59:59.000Z
For the Bose-condensed gas confined in a magnetic trap and in a two-dimensional optical lattice, the non-uniform distribution of atoms in different lattice sites is considered based on Gross-Pitaevskii equation. A propagator method is used to investigate the time evolution of 2D interference patterns after (i)only the optical lattice is swithed off, and (ii)both the optical lattice and the magnetic trap are swithed off. An analytical description on the motion of side peaks in the interference patterns is presented by using the density distribution in a momentum space.
The Benefits of 3D vs. 2D Analysis | GE Global Research
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del SolStrengthening a solidSynthesis of 2Dand Water |1Benefits of 3D vs. 2D Analysis
Inverse free-electron laser accelerator
Pellegrini, C.; Campisi, R.
1982-01-01T23:59:59.000Z
We first describe the basic physical properties of an inverse free-electron laser and make an estimate of the order of magnitude of the accelerating field obtainable with such a system; then apply the general ideas to the design of an actual device and through this example we give a more accurate evaluation of the fundamental as well as the technical limitations that this acceleration scheme imposes.
JointResearchCentre THE WATER FRAMEWORK DIRECTIVE
Commission *Directorate General Environment **Joint Research Centre #12;Evolvement of the EU Water.for operational methods and other supporting tools. ll Joint efforts and activities by all involved partiesJointJointResearchCentre THE WATER FRAMEWORK DIRECTIVE: THE CHALLENGES OF TESTING AND VALIDATION
Computationally efficient Bayesian inference for inverse problems.
Marzouk, Youssef M.; Najm, Habib N.; Rahn, Larry A.
2007-10-01T23:59:59.000Z
Bayesian statistics provides a foundation for inference from noisy and incomplete data, a natural mechanism for regularization in the form of prior information, and a quantitative assessment of uncertainty in the inferred results. Inverse problems - representing indirect estimation of model parameters, inputs, or structural components - can be fruitfully cast in this framework. Complex and computationally intensive forward models arising in physical applications, however, can render a Bayesian approach prohibitive. This difficulty is compounded by high-dimensional model spaces, as when the unknown is a spatiotemporal field. We present new algorithmic developments for Bayesian inference in this context, showing strong connections with the forward propagation of uncertainty. In particular, we introduce a stochastic spectral formulation that dramatically accelerates the Bayesian solution of inverse problems via rapid evaluation of a surrogate posterior. We also explore dimensionality reduction for the inference of spatiotemporal fields, using truncated spectral representations of Gaussian process priors. These new approaches are demonstrated on scalar transport problems arising in contaminant source inversion and in the inference of inhomogeneous material or transport properties. We also present a Bayesian framework for parameter estimation in stochastic models, where intrinsic stochasticity may be intermingled with observational noise. Evaluation of a likelihood function may not be analytically tractable in these cases, and thus several alternative Markov chain Monte Carlo (MCMC) schemes, operating on the product space of the observations and the parameters, are introduced.
Chen, J.
2013-01-01T23:59:59.000Z
seismic AVA and CSEM data for reservoir parameter estimationseismic AVA and CSEM data for reservoir parameter estimationCSEM and seismic data for reservoir parameters based on
A Module for Radiation Hydrodynamic Calculations With ZEUS-2D Using Flux-Limited Diffusion
N. J. Turner; J. M. Stone
2001-02-08T23:59:59.000Z
A module for the ZEUS-2D code is described which may be used to solve the equations of radiation hydrodynamics to order unity in v/c, in the flux-limited diffusion (FLD) approximation. In this approximation, the tensor Eddington factor f which closes the radiation moment equations is chosen to be an empirical function of radiation energy density. This is easier to implement and faster than full-transport techniques, in which f is computed by solving the transfer equation. However, FLD is less accurate when the flux has a component perpendicular to the gradient in radiation energy density, and in optically thin regions when the radiation field depends strongly on angle. The material component of the fluid is here assumed to be in local thermodynamic equilibrium. The energy equations are operator-split, with transport terms, radiation diffusion term, and other source terms evolved separately. Transport terms are applied using the same consistent transport algorithm as in ZEUS-2D. The radiation diffusion term is updated using an alternating-direction implicit method with convergence checking. Remaining source terms are advanced together implicitly using numerical root-finding. However when absorption opacity is zero, accuracy is improved by treating compression and expansion source terms using time-centered differencing. Results are discussed for test problems including radiation-damped linear waves, radiation fronts propagating in optically-thin media, subcritical and supercritical radiating shocks, and an optically-thick shock in which radiation dominates downstream pressure.
Directional Statistics for WIMP direct detection II: 2-d read-out
Ben Morgan; Anne M. Green
2005-11-17T23:59:59.000Z
The direction dependence of the WIMP direct detection rate provides a powerful tool for distinguishing a WIMP signal from possible backgrounds. We study the the number of events required to discriminate a WIMP signal from an isotropic background for a detector with 2-d read-out using non-parametric circular statistics. We also examine the number of events needed to i) detect a deviation from rotational symmetry, due to flattening of the Milky Way halo and ii) detect a deviation in the mean direction due to a tidal stream. If the senses of the recoils are measured then of order 20-70 events (depending on the plane of the 2-d read out) will be sufficient to reject isotropy of the raw recoil angles at 90% confidence. If the senses can not be measured these number increase by roughly two orders of magnitude (compared with an increase of one order of magnitude for the case of full 3-d read-out). The distributions of the reduced angles, with the (time dependent) direction of solar motion subtracted, are far more anisotropic, however, and if the isotropy tests are applied to these angles then the numbers of events required are similar to the case of 3-d read-out. A deviation from rotational symmetry will only be detectable if the Milky Way halo is significantly flattened. The deviation in the mean direction due to a tidal stream is potentially detectable, however, depending on the density and direction of the stream.
X-CSIT: a toolkit for simulating 2D pixel detectors
Joy, Ashley; Hauf, Steffen; Kuster, Markus; Rüter, Tonn
2015-01-01T23:59:59.000Z
A new, modular toolkit for creating simulations of 2D X-ray pixel detectors, X-CSIT (X-ray Camera SImulation Toolkit), is being developed. The toolkit uses three sequential simulations of detector processes which model photon interactions, electron charge cloud spreading with a high charge density plasma model and common electronic components used in detector readout. In addition, because of the wide variety in pixel detector design, X-CSIT has been designed as a modular platform so that existing functions can be modified or additional functionality added if the specific design of a detector demands it. X-CSIT will be used to create simulations of the detectors at the European XFEL, including three bespoke 2D detectors: the Adaptive Gain Integrating Pixel Detector (AGIPD), Large Pixel Detector (LPD) and DePFET Sensor with Signal Compression (DSSC). These simulations will be used by the detector group at the European XFEL for detector characterisation and calibration. For this purpose, X-CSIT has been integrat...
Electric Field Enhancement in a Self-Assembled 2D Array of Silver Nanospheres
El-Khoury, Patrick Z.; Khon, Elena; Gong, Yu; Joly, Alan G.; Abellan, Patricia; Evans, James E.; Browning, Nigel D.; Hu, Dehong; Zamkov, Mikhail; Hess, Wayne P.
2014-12-07T23:59:59.000Z
We investigate the plasmonic properties of a self-assembled 2D array of Ag nanospheres (average particle diameter/inter-particle separation distance of ~9/~4 nm). The structures of the individual particles and their assemblies are characterized using high-resolution transmission electron microscopy (HR-TEM). The plasmonic response of the nanoparticle network is probed using two-photon photoemission electron microscopy (TP-PEEM). HR-TEM and TP-PEEM statistics reveal the structure and plasmonic response of the network to be homogeneous on average. This translates into a relatively uniform surface-enhanced Raman scattering (SERS) response from biphenyl,4-4’-dithiol (BPDT) molecules adsorbed onto different sites of the network. Bright and background free SERS spectra are recorded, assigned on the basis of density 2 functional theory calculations in which BPDT is chemisorbed onto the vertex of a finitie tetrahedral Ag cluster consisting of 20 Ag atoms. A remarkable agreement between experiment and theory allows us to rigorously account for the observable vibrational states of BPDT in the ~200-2200 cm-1 region of the spectrum. Finite difference time domain simulations further reveal that physical enhancement factors on the order of 106 are attainable at the nanogaps formed between the silver nanospheres in the 2D array. Combined with modest chemical enhancement factors, this study paves the way for reproducible single molecule signals from an easily self-assembled SERS substrate.
Reactor safety issues resolved by the 2D/3D Program. International Agreement Report
Damerell, P.S.; Simons, J.W. [eds.] [MPR Associates, Inc., Washington, DC (United States)
1993-07-01T23:59:59.000Z
The 2D/3D Program studied multidimensional thermal-hydraulics in a PWR core and primary system during the end-of-blowdown and post-blowdown phases of a large-break LOCA (LBLOCA), and during selected small-break LOCA (SBLOCA) transients. The program included tests at the Cylindrical Core Test Facility (CCTF), the Slab Core Test Facility (SCTF), and the Upper Plenum Test Facility (UPTF), and computer analyses using TRAC. Tests at CCTF investigated core thermal-hydraulics and overall system behavior while tests at SCTF concentrated on multidimensional core thermal-hydraulics. The UPTF tests investigated two-phase flow behavior in the downcomer, upper plenum, tie plate region, and primary loops. TRAC analyses evaluated thermal-hydraulic behavior throughout the primary system in tests as well as in PWRs. This report summarizes the test and analysis results in each of the main areas where improved information was obtained in the 2D/3D Program. The discussion is organized in terms of the reactor safety issues investigated.
Liquid scintillator for 2D dosimetry for high-energy photon beams
Poenisch, Falk; Archambault, Louis; Briere, Tina Marie; Sahoo, Narayan; Mohan, Radhe; Beddar, Sam; Gillin, Michael T. [Department of Radiation Physics, University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard., Unit 94, Houston, Texas 77030 (United States)
2009-05-15T23:59:59.000Z
Complex radiation therapy techniques require dosimetric verification of treatment planning and delivery. The authors investigated a liquid scintillator (LS) system for application for real-time high-energy photon beam dosimetry. The system was comprised of a transparent acrylic tank filled with liquid scintillating material, an opaque outer tank, and a CCD camera. A series of images was acquired when the tank with liquid scintillator was irradiated with a 6 MV photon beam, and the light data measured with the CCD camera were filtered to correct for scattering of the optical light inside the liquid scintillator. Depth-dose and lateral profiles as well as two-dimensional (2D) dose distributions were found to agree with results from the treatment planning system. Further, the corrected light output was found to be linear with dose, dose rate independent, and is robust for single or multiple acquisitions. The short time needed for image acquisition and processing could make this system ideal for fast verification of the beam characteristics of the treatment machine. This new detector system shows a potential usefulness of the LS for 2D QA.
A Cut-Cell Approach for 2D Cartesian Meshes that Preserves Orthogonal Grid Sweep Ordering
Jarrell, Joshua J [ORNL] [ORNL; Grove, Robert E [ORNL] [ORNL; Evans, Thomas M [ORNL] [ORNL
2011-01-01T23:59:59.000Z
In this paper, we present a cut-cell methodology for solving the two-dimensional neutral-particle transport equation on an orthogonal Cartesian grid. We allow the rectangular cell to be subdivided into two polygonal subcells. We ensure that this division (or cut) conserves the volumes of the materials in the subcells and we utilize a step-characteristics (SC) slice balance approach (SBA) to calculate the angular fluxes exiting the cell as well as the average scalar fluxes in each subcell. Solving the discrete ordinates transport equation on an arbitrary mesh has historically been difficult to parallelize while maintaining good parallel efficiency. However on Cartesian meshes, the KBA algorithm maintains good parallel efficiency using a direct solve. The ability to preserve this algorithm was a driving factor in the development of our cut-cell method. This method also provides a more accurate depiction of a material interface in a cell, which leads to more accurate solutions downstream of this cell. As a result, fewer spatial cells can be utilized, resulting in reduced memory requirements. We apply this approach in the 2D/3D discrete ordinates neutral-particle transport code Denovo, where we analyze a 2D 3 x 3 lattice of pincells. We show that, for eigenvalue problems, a significant increase in accuracy for a given mesh size is gained by utilizing the cut-cell, SC equations instead of the standard homogenized-cell, SC equations.
A New 2D-Transport, 1D-Diffusion Approximation of the Boltzmann Transport equation
Larsen, Edward
2013-06-17T23:59:59.000Z
The work performed in this project consisted of the derivation, implementation, and testing of a new, computationally advantageous approximation to the 3D Boltz- mann transport equation. The solution of the Boltzmann equation is the neutron flux in nuclear reactor cores and shields, but solving this equation is difficult and costly. The new “2D/1D” approximation takes advantage of a special geometric feature of typical 3D reactors to approximate the neutron transport physics in a specific (ax- ial) direction, but not in the other two (radial) directions. The resulting equation is much less expensive to solve computationally, and its solutions are expected to be sufficiently accurate for many practical problems. In this project we formulated the new equation, discretized it using standard methods, developed a stable itera- tion scheme for solving the equation, implemented the new numerical scheme in the MPACT code, and tested the method on several realistic problems. All the hoped- for features of this new approximation were seen. For large, difficult problems, the resulting 2D/1D solution is highly accurate, and is calculated about 100 times faster than a 3D discrete ordinates simulation.
The 2D surfaces that generate Newtonian and general relativistic orbits with small eccentricities
Chad A. Middleton
2015-06-09T23:59:59.000Z
Embedding diagrams prove to be quite useful when learning general relativity as they offer a way of visualizing spacetime curvature through warped two dimensional (2D) surfaces. In this manuscript we present a different 2D construct that also serves as a useful conceptual tool for gaining insight into gravitation, in particular, orbital dynamics - namely the cylindrically symmetric surfaces that generate Newtonian and general relativistic orbits with small eccentricities. Although we first show that no such surface exists that can exactly reproduce the arbitrary bound orbits of Newtonian gravitation or of general relativity (or, more generally, of any spherically symmetric potential), surfaces do exist that closely approximate the resulting orbital motion for small eccentricities; exactly the regime that describes the motion of the solar system planets. These surfaces help to illustrate the similarities, as well as the differences, between the two theories of gravitation (i.e. stationary elliptical orbits in Newtonian gravitation and precessing elliptical-like orbits in general relativity) and offer, in this age of 3D printing, an opportunity for students and instructors to experimentally explore the predictions made by each.
Kent, B.; Garvey, C.J.; Cookson, D.; Bryant, G.; (Aust.Synch.); (ANSTO); (RMIT)
2009-01-05T23:59:59.000Z
The inverse hexagonal to inverse ribbon phase transition in a mixed phosphatidylcholine-phosphatidylethanolamine system at low hydration is studied using small and wide angle X-ray scattering. It is found that the structural parameters of the inverse hexagonal phase are independent of temperature. By contrast the length of each ribbon of the inverse ribbon phase increases continuously with decreasing temperature over a range of 50 C. At low temperatures the inverse ribbon phase is observed to have a transition to a gel lamellar phase, with no intermediate fluid lamellar phase. This phase transition is confirmed by differential scanning calorimetry.
Spin wave theory for 2D disordered hard-core bosons
Zúñiga, Juan Pablo Álvarez; Lemarié, Gabriel; Laflorencie, Nicolas [Laboratoire de Physique Théorique, Université de Toulouse, UPS, (IRSAMC), Toulouse (France)
2014-08-20T23:59:59.000Z
A spin-wave (SW) approach for hard-core bosons is presented to treat the problem of two dimensional boson localization in a random potential. After a short review of the method to compute 1/S-corrected observables, the case of random on-site energy is discussed. Whereas the mean-field solution does not display a Bose glass (BG) phase, 1/S corrections do capture BG physics. In particular, the localization of SW excitations is discussed through the inverse participation ratio.
Qualification of the Joints for the ITER Central Solenoid
Martovetsky, N; Berryhill, A; Kenney, S
2011-09-01T23:59:59.000Z
The ITER Central Solenoid has 36 interpancake joints, 12 bus joints, and 12 feeder joints in the magnet. The joints are required to have resistance below 4 nOhm at 45 kA at 4.5 K. The US ITER Project Office developed two different types of interpancake joints with some variations in details in order to find a better design, qualify the joints, and establish a fabrication process. We built and tested four samples of the sintered joints and two samples with butt-bonded joints (a total of eight joints). Both designs met the specifications. Results of the joint development, test results, and selection of the baseline design are presented and discussed in the paper. The ITER Central Solenoid (CS) consists of six modules. Each module is composed of six wound hexapancakes and one quadrapancake. The multipancakes are connected electrically and hydraulically by in-line interpancake joints. The joints are located at the outside diameter (OD) of the module. Cable in conduit conductor (CICC) high-current joints are critical elements in the CICC magnets. In addition to low resistivity, the CS joints must fit a space envelope equivalent to the regular conductor cross section and must have low hydraulic impedance and enough structural strength to withstand the hoop and compressive forces during operation, including cycling. This paper is the continuation of the work reported on the intermodule joints.
Data:853095d3-77db-4317-95ab-2d1611b26079 | Open Energy Information
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Development of models for the two-dimensional, two-fluid code for sodium boiling NATOF-2D
Zielinski, R. G.
1981-01-01T23:59:59.000Z
Several features were incorporated into NATOF-2D, a twodimensional, two fluid code developed at M.I.T. for the purpose of analysis of sodium boiling transients under LMFBR conditions. They include improved interfacial mass, ...
2D protrusion but not motility predicts growth factor–induced cancer cell migration in 3D collagen
Meyer, Aaron Samuel
Growth factor–induced migration is a critical step in the dissemination and metastasis of solid tumors. Although differences in properties characterizing cell migration on two-dimensional (2D) substrata versus within ...
Lee, Hunwoo
2012-08-31T23:59:59.000Z
Development of the Robotic Touch foot Sensor for 2D walking Robot, for Studying Rough Terrain Locomotion By HUNWOO LEE Submitted to the graduate degree program in Mechanical Engineering and the Graduate Faculty of the University of Kansas... ________________________________ Professor Robert Umholtz Date Defended: June 5, 2012 ii The Thesis Committee for HUNWOO LEE certifies that this is the approved version of the following thesis: Development of the Robotic Touch Foot Sensor for 2D Walking Robot...
Handbook on dynamics of jointed structures.
Ames, Nicoli M.; Lauffer, James P.; Jew, Michael D.; Segalman, Daniel Joseph; Gregory, Danny Lynn; Starr, Michael James; Resor, Brian Ray
2009-07-01T23:59:59.000Z
The problem of understanding and modeling the complicated physics underlying the action and response of the interfaces in typical structures under dynamic loading conditions has occupied researchers for many decades. This handbook presents an integrated approach to the goal of dynamic modeling of typical jointed structures, beginning with a mathematical assessment of experimental or simulation data, development of constitutive models to account for load histories to deformation, establishment of kinematic models coupling to the continuum models, and application of finite element analysis leading to dynamic structural simulation. In addition, formulations are discussed to mitigate the very short simulation time steps that appear to be required in numerical simulation for problems such as this. This handbook satisfies the commitment to DOE that Sandia will develop the technical content and write a Joints Handbook. The content will include: (1) Methods for characterizing the nonlinear stiffness and energy dissipation for typical joints used in mechanical systems and components. (2) The methodology will include practical guidance on experiments, and reduced order models that can be used to characterize joint behavior. (3) Examples for typical bolted and screw joints will be provided.
4D tumor centroid tracking using orthogonal 2D dynamic MRI: Implications for radiotherapy planning
Tryggestad, Erik [Department of Radiation Oncology and Molecular Radiation Sciences, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21231 and Department of Radiation Oncology, Mayo Clinic, Rochester, Minnesota 55905 (United States)] [Department of Radiation Oncology and Molecular Radiation Sciences, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21231 and Department of Radiation Oncology, Mayo Clinic, Rochester, Minnesota 55905 (United States); Flammang, Aaron; Shea, Steven M. [Center for Applied Medical Imaging, Siemens Corporation, Corporate Technology, Baltimore, Maryland 21205 (United States)] [Center for Applied Medical Imaging, Siemens Corporation, Corporate Technology, Baltimore, Maryland 21205 (United States); Hales, Russell; Herman, Joseph; Lee, Junghoon; McNutt, Todd; Roland, Teboh; Wong, John [Department of Radiation Oncology and Molecular Radiation Sciences, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21231 (United States)] [Department of Radiation Oncology and Molecular Radiation Sciences, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21231 (United States)
2013-09-15T23:59:59.000Z
Purpose: Current pretreatment, 4D imaging techniques are suboptimal in that they sample breathing motion over a very limited “snapshot” in time. Heretofore, long-duration, 4D motion characterization for radiotherapy planning, margin optimization, and validation have been impractical for safety reasons, requiring invasive markers imaged under x-ray fluoroscopy. To characterize 3D tumor motion and associated variability over durations more consistent with treatments, the authors have developed a practical dynamic MRI (dMRI) technique employing two orthogonal planes acquired in a continuous, interleaved fashion.Methods: 2D balanced steady-state free precession MRI was acquired continuously over 9–14 min at approximately 4 Hz in three healthy volunteers using a commercial 1.5 T system; alternating orthogonal imaging planes (sagittal, coronal, sagittal, etc.) were employed. The 2D in-plane pixel resolution was 2 × 2 mm{sup 2} with a 5 mm slice profile. Simultaneous with image acquisition, the authors monitored a 1D surrogate respiratory signal using a device available with the MRI system. 2D template matching-based anatomic feature registration, or tracking, was performed independently in each orientation. 4D feature tracking at the raw frame rate was derived using spline interpolation.Results: Tracking vascular features in the lung for two volunteers and pancreatic features in one volunteer, the authors have successfully demonstrated this method. Registration error, defined here as the difference between the sagittal and coronal tracking result in the SI direction, ranged from 0.7 to 1.6 mm (1?) which was less than the acquired image resolution. Although the healthy volunteers were instructed to relax and breathe normally, significantly variable respiration was observed. To demonstrate potential applications of this technique, the authors subsequently explored the intrafraction stability of hypothetical tumoral internal target volumes and 3D spatial probability distribution functions. The surrogate respiratory information allowed the authors to show how this technique can be used to study correlations between internal and external (surrogate) information over these prolonged durations. However, compared against the gold standard of the time stamps in the dMRI frames, the temporal synchronization of the surrogate 1D respiratory information was shown to be likely unreliable.Conclusions: The authors have established viability of a novel and practical pretreatment, 4D tumor centroid tracking method employing a commercially available dynamic MRI sequence. Further developments from the vendor are likely needed to provide a reliably synchronized surrogate 1D respiratory signal, which will likely broaden the utility of this method in the pretreatment radiotherapy planning context.
Center for Inverse Design: Staff Biographies
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWPSuccess StoriesFebruaryMetalControlInverse Design Organization
Determining Transition State Geometries in Liquids Using 2D-IR
Harris, Charles; Cahoon, James F.; Sawyer, Karma R.; Schlegel, Jacob P.; Harris, Charles B.
2007-12-11T23:59:59.000Z
Many properties of chemical reactions are determined by the transition state connecting reactant and product, yet it is difficult to directly obtain any information about these short-lived structures in liquids. We show that two-dimensional infrared (2D-IR) spectroscopy can provide direct information about transition states by tracking the transformation of vibrational modes as a molecule crossed a transition state. We successfully monitored a simple chemical reaction, the fluxional rearrangement of Fe(CO)5, in which the exchange of axial and equatorial CO ligands causes an exchange of vibrational energy between the normal modes of the molecule. This energy transfer provides direct evidence regarding the time scale, transition state, and mechanism of the reaction.
Evidence for 2D Solitary Sound Waves in a Lipid Controlled Interface and its Biological Implications
Shamit Shrivastava; Matthias F. Schneider
2014-05-08T23:59:59.000Z
Biological membranes by virtue of their elastic properties should be capable of propagating localized perturbations analogous to sound waves. However, the existence and the possible role of such waves in communication in biology remains unexplored. Here we report the first observations of 2D solitary elastic pulses in lipid interfaces, excited mechanically and detected by FRET. We demonstrate that the nonlinearity near a maximum in the susceptibility of the lipid monolayer results in solitary pulses that also have a threshold for excitation. These experiments clearly demonstrate that the state of the interface regulates the propagation of pulses both qualitatively and quantitatively. We elaborate on the striking similarity of the observed phenomenon to nerve pulse propagation and a thermodynamic basis of cell signaling in general.
Matter-wave 2D solitons in crossed linear and nonlinear optical lattices
H. L. F. da Luz; F. Kh. Abdullaev; A. Gammal; M. Salerno; Lauro Tomio
2010-11-08T23:59:59.000Z
It is demonstrated the existence of multidimensional matter-wave solitons in a crossed optical lattice (OL) with linear OL in the $x-$direction and nonlinear OL (NOL) in the $y-$direction, where the NOL can be generated by a periodic spatial modulation of the scattering length using an optically induced Feshbach resonance. In particular, we show that such crossed linear and nonlinear OL allows to stabilize two-dimensional (2D) solitons against decay or collapse for both attractive and repulsive interactions. The solutions for the soliton stability are investigated analytically, by using a multi-Gaussian variational approach (VA), with the Vakhitov-Kolokolov (VK) necessary criterion for stability; and numerically, by using the relaxation method and direct numerical time integrations of the Gross-Pitaevskii equation (GPE). Very good agreement of the results corresponding to both treatments is observed.
Controlling the Spontaneous Emission Rate of Single Quantum Dots in a 2D Photonic Crystal
Dirk Englund; David Fattal; Edo Waks; Glenn Solomon; Bingyang Zhang; Toshihiro Nakaoka; Yasuhiko Arakawa; Yoshihisa Yamamoto; Jelena Vuckovic
2005-04-20T23:59:59.000Z
We observe large spontaneous emission rate modification of individual InAs Quantum Dots (QDs) in 2D a photonic crystal with a modified, high-Q single defect cavity. Compared to QDs in bulk semiconductor, QDs that are resonant with the cavity show an emission rate increase by up to a factor of 8. In contrast, off-resonant QDs indicate up to five-fold rate quenching as the local density of optical states (LDOS) is diminished in the photonic crystal. In both cases we demonstrate photon antibunching, showing that the structure represents an on-demand single photon source with pulse duration from 210 ps to 8 ns. We explain the suppression of QD emission rate using Finite Difference Time Domain (FDTD) simulations and find good agreement with experiment.
2D massless QED Hall half-integer conductivity and graphene
A. Pérez Martínez; E. Rodriguez Querts; H. Pérez Rojas; R. Gaitan; S. Rodriguez Romo
2011-10-13T23:59:59.000Z
Starting from the photon self-energy tensor in a magnetized medium, the 3D complete antisymmetric form of the conductivity tensor is found in the static limit of a fermion system $C$ non-invariant under fermion-antifermion exchange. The massless relativistic 2D fermion limit in QED is derived by using the compactification along the dimension parallel to the magnetic field. In the static limit and at zero temperature the main features of quantum Hall effect (QHE) are obtained: the half-integer QHE and the minimum value proportional to $e^2/h$ for the Hall conductivity . For typical values of graphene the plateaus of the Hall conductivity are also reproduced.
The low frequency 2D vibration sensor based on flat coil element
Djamal, Mitra; Sanjaya, Edi; Islahudin; Ramli [Department of Physics, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40116 (Indonesia); Department of Physics, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40116 (Indonesia) and Department of Physics, UIN Syarif Hidayatullah, Jl. Ir.H. Djuanda 95 Ciputat 15412 (Indonesia); MTs NW Nurul Iman Kembang Kerang, Jl. Raya Mataram - Lb.Lombok, NTB (Indonesia); Department of Physics, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40116 (Indonesia) and Department of Physics,Universitas Negeri Padang, Jl. Prof. Hamka, Padang 25132 (Indonesia)
2012-06-20T23:59:59.000Z
Vibration like an earthquake is a phenomenon of physics. The characteristics of these vibrations can be used as an early warning system so as to reduce the loss or damage caused by earthquakes. In this paper, we introduced a new type of low frequency 2D vibration sensor based on flat coil element that we have developed. Its working principle is based on position change of a seismic mass that put in front of a flat coil element. The flat coil is a part of a LC oscillator; therefore, the change of seismic mass position will change its resonance frequency. The results of measurements of low frequency vibration sensor in the direction of the x axis and y axis gives the frequency range between 0.2 to 1.0 Hz.
Superclusters of galaxies from the 2dF redshift survey. 2. Comparison with simulations
Einasto, Jaan; Einasto, M.; Saar, E.; Tago, E.; Liivamagi, L.J.; Joeveer, M.J; Suhhonenko, I.; Hutsi, G.; /Tartu Observ.; Jaaniste, J.; /Estonian U.; Heinamaki, P.; /Tuorla; Muller, V.; Knebe, A.; /Potsdam, Astrophys. Inst.; Tucker, D.; /Fermilab
2006-04-01T23:59:59.000Z
We investigate properties of superclusters of galaxies found on the basis of the 2dF Galaxy Redshift Survey, and compare them with properties of superclusters from the Millennium Simulation.We study the dependence of various characteristics of superclusters on their distance from the observer, on their total luminosity, and on their multiplicity. The multiplicity is defined by the number of Density Field (DF) clusters in superclusters. Using the multiplicity we divide superclusters into four richness classes: poor, medium, rich and extremely rich.We show that superclusters are asymmetrical and have multi-branching filamentary structure, with the degree of asymmetry and filamentarity being higher for the more luminous and richer superclusters. The comparison of real superclusters with Millennium superclusters shows that most properties of simulated superclusters agree very well with real data, the main differences being in the luminosity and multiplicity distributions.
On a 2D hydro-mechanical lattice approach for modelling hydraulic fracture
Grassl, Peter; Gallipoli, Domenico; Wheeler, Simon J
2014-01-01T23:59:59.000Z
A 2D lattice approach to describe hydraulic fracturing is presented. The interaction of fluid pressure and mechanical response is described by Biot's theory. The lattice model is applied to the analysis of a thick-walled cylinder, for which an analytical solution for the elastic response is derived. The numerical results obtained with the lattice model agree well with the analytical solution. Furthermore, the coupled lattice approach is applied to the fracture analysis of the thick-walled cylinder. It is shown that the proposed lattice approach provides results that are independent of the mesh size. Moreover, a strong geometrical size effect on nominal strength is observed which lies between analytically derived lower and upper bounds. This size effect decreases with increasing Biot's coefficient.
Direct control of the small-scale energy balance in 2D fluid dynamics
Frank, Jason; Myerscough, Keith
2014-01-01T23:59:59.000Z
We explore the direct modification of the pseudo-spectral truncation of 2D, incompressible fluid dynamics to maintain a prescribed kinetic energy spectrum. The method provides a means of simulating fluid states with defined spectral properties, for the purpose of matching simulation statistics to given information, arising from observations, theoretical prediction or high fidelity simulation. In the scheme outlined here, Nos\\'e-Hoover thermostats, commonly used in molecular dynamics, are introduced as feedback controls applied to energy shells of the Fourier-discretized Navier-Stokes equations. As we demonstrate in numerical experiments, the dynamical properties (quantified using autocorrelation functions) are only modestly perturbed by our device, while ensemble dispersion is significantly enhanced in comparison with simulations of a corresponding truncation incorporating hyperviscosity.
2D and 3D Core-Collapse Supernovae Simulation Results Obtained with the CHIMERA Code
Bruenn, S W; Hix, W R; Blondin, J M; Marronetti, P; Messer, O E B; Dirk, C J; Yoshida, S
2010-01-01T23:59:59.000Z
Much progress in realistic modeling of core-collapse supernovae has occurred recently through the availability of multi-teraflop machines and the increasing sophistication of supernova codes. These improvements are enabling simulations with enough realism that the explosion mechanism, long a mystery, may soon be delineated. We briefly describe the CHIMERA code, a supernova code we have developed to simulate core-collapse supernovae in 1, 2, and 3 spatial dimensions. We then describe the results of an ongoing suite of 2D simulations initiated from a 12, 15, 20, and 25 solar mass progenitor. These have all exhibited explosions and are currently in the expanding phase with the shock at between 5,000 and 20,000 km. We also briefly describe an ongoing simulation in 3 spatial dimensions initiated from the 15 solar mass progenitor.
Transition from static to kinetic friction: Insights from a 2D model
Trømborg, Jørgen; Amundsen, David Skålid; Thøgersen, Kjetil; Malthe-Sørenssen, Anders
2013-01-01T23:59:59.000Z
We describe a 2D spring-block model for the transition from static to kinetic friction at an elastic slider/rigid substrate interface obeying a minimalistic friction law (Amontons-Coulomb). By using realistic boundary conditions, a number of previously unexplained experimental results on precursory micro-slip fronts are successfully reproduced. From the analysis of the interfacial stresses, we derive a prediction for the evolution of the precursor length as a function of the applied loads, as well as an approximate relationship between microscopic and macroscopic friction coefficients. We show that the stress build-up due to both elastic loading and micro-slip-related relaxations depend only weakly on the underlying shear crack propagation dynamics. Conversely, crack speed depends strongly on both the instantaneous stresses and the friction coefficients, through a non-trivial scaling parameter.
Jet theoretical Yang-Mills energy in the geometric dynamics of 2D-monolayer
M. Neagu; N. G. Krylova; H. V. Grushevskaya
2012-08-05T23:59:59.000Z
Langmuir-Blodgett films (LB-films) consist from few LB-monolayers which are high structured nanomaterials that are very promising materials for applications. We use a geometrical approach to describe structurization into LB-monolayers. Consequently, we develop on the 1-jet space J^1([0,\\infty),R^2) the single-time Lagrange geometry (in the sense of distinguished (d-) connection, d-torsions and an abstract anisotropic electromagnetic-like d-field) for the Lagrangian governing the 2D-motion of a particle of monolayer. One assumed that an expansion near singular points for the constructed geometrical Lagrangian theory describe phase transitions to LB-monolayer. Trajectories of particles in a field of the electrocapillarity forces of monolayer have been calculated in a resonant approximation utilizing some Jacobi equations. A jet geometrical Yang-Mills energy is introduced and some physical interpretations are given.
2D full wave modeling for a synthetic Doppler backscattering diagnostic
Hillesheim, J. C.; Schmitz, L.; Kubota, S.; Rhodes, T. L.; Carter, T. A. [Department of Physics and Astronomy, University of California, Los Angeles, California 90095 (United States); Holland, C. [University of California, San Diego, La Jolla, California 92093 (United States)
2012-10-15T23:59:59.000Z
Doppler backscattering (DBS) is a plasma diagnostic used in tokamaks and other magnetic confinement devices to measure the fluctuation level of intermediate wavenumber (k{sub {theta}}{rho}{sub s}{approx} 1) density fluctuations and the lab frame propagation velocity of turbulence. Here, a synthetic DBS diagnostic is described, which has been used for comparisons between measurements in the DIII-D tokamak and predictions from nonlinear gyrokinetic simulations. To estimate the wavenumber range to which a Gaussian beam would be sensitive, a ray tracing code and a 2D finite difference, time domain full wave code are used. Experimental density profiles and magnetic geometry are used along with the experimental antenna and beam characteristics. An example of the effect of the synthetic diagnostic on the output of a nonlinear gyrokinetic simulation is presented.
Holographic Entanglement Entropy in 2D Holographic Superconductor via $AdS_3/CFT_2$
Momeni, Davood; Raza, Muhammad; Myrzakulov, Ratbay
2015-01-01T23:59:59.000Z
The aim of the present letter is to find the holographic entanglement entropy (HEE) in 2D holographic superconductors (HSC). Indeed, it possible to compute the exact form of this entropy due to a advantage of approximate solutions inside normal and superconducting phases with backreactions. By making the UV and IR limits applied to the integrals, an approximate expression is obtained. In case the software cannot calculate minimal surface integrals analytically it offers the possibility to proceed with a numerical evaluation of the corresponding terms. We'll understand how the area formula incorporates the structure of the domain wall approximation. We conclude that the wider belt angle corresponds to a larger surface holographic surface. We see that HEE changes linearly with belt angle.
Holographic Entanglement Entropy in 2D Holographic Superconductor via $AdS_3/CFT_2$
Davood Momeni; Hossein Gholizade; Muhammad Raza; Ratbay Myrzakulov
2015-03-10T23:59:59.000Z
The aim of the present letter is to find the holographic entanglement entropy (HEE) in 2D holographic superconductors (HSC). Indeed, it possible to compute the exact form of this entropy due to a advantage of approximate solutions inside normal and superconducting phases with backreactions. By making the UV and IR limits applied to the integrals, an approximate expression is obtained. In case the software cannot calculate minimal surface integrals analytically it offers the possibility to proceed with a numerical evaluation of the corresponding terms. We'll understand how the area formula incorporates the structure of the domain wall approximation. We conclude that the wider belt angle corresponds to a larger surface holographic surface. We see that HEE changes linearly with belt angle.
Observation of Rashba zero-field spin splitting in a strained germanium 2D hole gas
Morrison, C., E-mail: c.morrison.2@warwick.ac.uk; Rhead, S. D.; Foronda, J.; Leadley, D. R.; Myronov, M. [Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom); Wi?niewski, P. [Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroclaw (Poland)
2014-11-03T23:59:59.000Z
We report the observation, through Shubnikov-de Haas oscillations in the magnetoresistance, of spin splitting caused by the Rashba spin-orbit interaction in a strained Ge quantum well epitaxially grown on a standard Si(001) substrate. The Shubnikov-de Haas oscillations display a beating pattern due to the spin split Landau levels. The spin-orbit parameter and Rashba spin-splitting energy are found to be 1.0?×?10{sup ?28?}?eVm{sup 3} and 1.4?meV, respectively. This energy is comparable to 2D electron gases in III-V semiconductors, but substantially larger than in Si, and illustrates the suitability of Ge for modulated hole spin transport devices.
Depauw, V; Daif, O El; Gomard, G; Lalouat, L; Drouard, E; Trompoukis, C; Fave, A; Seassal, C; Gordon, I
2013-01-01T23:59:59.000Z
A 2-D photonic crystal was integrated experimentally into a thin-film crystalline-silicon solar cell of 1-{\\mu}m thickness, after numerical optimization maximizing light absorption in the active material. The photonic crystal boosted the short-circuit current of the cell, but it also damaged its open-circuit voltage and fill factor, which led to an overall decrease in performances. Comparisons between modeled and actual optical behaviors of the cell, and between ideal and actual morphologies, show the global robustness of the nanostructure to experimental deviations, but its particular sensitivity to the conformality of the top coatings and the spread in pattern dimensions, which should not be neglected in the optical model. As for the electrical behavior, the measured internal quantum efficiency shows the strong parasitic absorptions from the transparent conductive oxide and from the back-reflector, as well as the negative impact of the nanopattern on surface passivation. Our exemplifying case, thus, illustr...
A 2-D Implicit, Energy and Charge Conserving Particle In Cell Method
McPherson, Allen L. [Los Alamos National Laboratory; Knoll, Dana A. [Los Alamos National Laboratory; Cieren, Emmanuel B. [Los Alamos National Laboratory; Feltman, Nicolas [Los Alamos National Laboratory; Leibs, Christopher A. [Los Alamos National Laboratory; McCarthy, Colleen [Los Alamos National Laboratory; Murthy, Karthik S. [Los Alamos National Laboratory; Wang, Yijie [Los Alamos National Laboratory
2012-09-10T23:59:59.000Z
Recently, a fully implicit electrostatic 1D charge- and energy-conserving particle-in-cell algorithm was proposed and implemented by Chen et al ([2],[3]). Central to the algorithm is an advanced particle pusher. Particles are moved using an energy conserving scheme and are forced to stop at cell faces to conserve charge. Moreover, a time estimator is used to control errors in momentum. Here we implement and extend this advanced particle pusher to include 2D and electromagnetic fields. Derivations of all modifications made are presented in full. Special consideration is taken to ensure easy coupling into the implicit moment based method proposed by Taitano et al [19]. Focus is then given to optimizing the presented particle pusher on emerging architectures. Two multicore implementations, and one GPU (Graphics Processing Unit) implementation are discussed and analyzed.
The 2dF-SDSS LRG and QSO Survey: The spectroscopic QSO catalogue
Scott M. Croom; Gordon T. Richards; Tom Shanks; Brian J. Boyle; Robert G. Sharp; Joss Bland-Hawthorn; Terry Bridges; Robert J. Brunner; Russell Cannon; Daniel Carson; Kuenley Chiu; Matthew Colless; Warrick Couch; Roberto De Propris; Michael J. Drinkwater; Alastair Edge; Stephen Fine; Jon Loveday; Lance Miller; Adam D. Myers; Robert C. Nichol; Phil Outram; Kevin Pimbblet; Isaac Roseboom; Nicholas Ross; Donald P. Schneider; Allyn Smith; Chris Stoughton; Michael A. Strauss; David Wake
2008-10-27T23:59:59.000Z
We present the final spectroscopic QSO catalogue from the 2dF-SDSS LRG and QSO (2SLAQ) Survey. This is a deep, 18
Joint measurability, steering and entropic uncertainty
H. S. Karthik; A. R. Usha Devi; A. K. Rajagopal
2014-12-02T23:59:59.000Z
The notion of incompatibility of measurements in quantum theory is in stark contrast with the corresponding classical perspective, where all physical observables are jointly measurable. It is of interest to examine if the results of two or more measurements in the quantum scenario can be perceived from a classical point of view or they still exhibit non-classical features. Clearly, commuting observables can be measured jointly using projective measurements and their statistical outcomes can be discerned classically. However, such simple minded association of compatibility of measurements with commutativity turns out to be limited in an extended framework, where the usual notion of sharp projective valued measurements of self adjoint observables gets broadened to include unsharp measurements of generalized observables constituting positive operator valued measures (POVM). There is a surge of research activity recently towards gaining new physical insights on the emergence of classical behavior via joint measurability of unsharp observables. Here, we explore the entropic uncertainty relation for a pair of discrete observables (of Alice's system) when an entangled quantum memory of Bob is restricted to record outcomes of jointly measurable POVMs only. Within the joint measurability regime, the sum of entropies associated with Alice's measurement outcomes - conditioned by the results registered at Bob's end - are constrained to obey an entropic steering inequality. In this case, Bob's non-steerability reflects itself as his inability in predicting the outcomes of Alice's pair of non-commuting observables with better precision, even when they share an entangled state. As a further consequence, the quantum advantage envisaged for the construction of security proofs in key distribution is lost, when Bob's measurements are restricted to the joint measurability regime.
Joint resummation for heavy quark production.
Banfi, Andrea; Laenen, Eric
ar X iv :h ep -p h/ 05 10 14 9v 1 1 2 O ct 2 00 5 February 2, 2008 4:14 WSPC/INSTRUCTION FILE jr International Journal of Modern Physics A c© World Scientific Publishing Company JOINT RESUMMATION FOR HEAVY QUARK PRODUCTION ANDREA BANFI Cavendish... hadroproduction, at next-to-leading logarithmic accuracy. We exhibit their dependence on the production channel and the color configurations, and compare these distributions to eachother and to NLO. Keywords: Resummation; heavy quark production. 1. Joint threshold...
Joint Genome Institute (JGI) Projects at NERSC
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is Your Home as Ready for(SC)Joint Genome Institute (JGI) Joint
Joint Faculty Appointments | ornl.gov
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron beamJoin HERO Mariners vs.Joint EnvironmentalJoint
Contact stress in a whole joint bioreactor : intrinsic levels & augmentation by external loading
Deppe, Allison Margaret
2007-01-01T23:59:59.000Z
Stress in a Whole Joint Bioreactor: Intrinsic Levels &Stress in a Whole Joint Bioreactor: Intrinsic levels &Sah, Chair A whole joint bioreactor was recently described
PICLE: a 2-D code for laser-beam - gas-jet interaction studies
Dunning, M.J.
1981-01-01T23:59:59.000Z
A heat transport hydrodynamic PIC code was adapted for application to the KMSF gas-jet experiments. The input material density profile was changed from the original solid slab geometry to a cylindrically symmetric profile modeling the gas-jet plume. The target material was changed from the original Z = 1 to arbitrary Z. Energy deposition was modified to include inverse bremsstrahlung and resonance absorption. Preliminary results indicate electron thermal conduction dominates over mass flow for times up to about the laser pulse length. Electron thermal conduction is seen to vary between classical and flux-limited values spatially and temporally according to plasma conditions. Applications of this code, entitled PICLE (Particle-In-Cell Laser Equipment code), to absorption and flux-limit parameter studies are described. A source listing and sample input deck are included.
Importance of Elevation and Temperature Inversions for the Interpretat...
Importance of Elevation and Temperature Inversions for the Interpretation of Thermal Infrared Satellite Images Used in Geothermal Exploration Jump to: navigation, search OpenEI...
Advanced Imaging and Ultra-fast Material Probing With Inverse...
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Imaging and Ultra-fast Material Probing With Inverse Compton Scattering A proposal to the Brookhaven Accelerator Test Facility Gerard Andonian, Alberto Bacci, Ubaldo...
High Gradient Inverse Free Electron Laser (IFEL) Accelerator
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Gradient High energy gain Inverse Free Electron Laser P. Musumeci UCLA Department of Physics and Astronomy On Behalf of the RUBICON collaboration ATF user meeting, BNL, October 6...
Three-Dimensional Inversion of Magnetotelluric Data on a PC,...
Coso Geothermal Field Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings: Three-Dimensional Inversion of Magnetotelluric Data on a PC,...
Huang, Lianjie [Los Alamos National Laboratory; Fehler, Michael [MIT; Malcolm, Alison [MIT; Yang, Di [MIT
2011-01-01T23:59:59.000Z
Geological carbon sequestration involves large-scale injection of carbon dioxide into underground geologic formations and is considered as a potential approach for mitigating global warming. Changes in reservoir properties resulting from the CO{sub 2} injection and migration can be characterized using waveform inversions of time-lapse seismic data. The conventional approach for analysis using waveform tomography is to take the difference of the images obtained using baseline and subsequent time-lapse datasets that are inverted independently. By contrast, double-difference waveform inversion uses timelapse seismic datasets to jointly invert for reservoir changes. We apply this method to a field time-lapse walkaway VSP data set acquired in 2008 and 2009 for monitoring CO{sub 2} injection at an enhanced oil recovery field at SACROC, Texas. The double-difference waveform inversion gives a cleaner and more easily interpreted image of reservoir changes, as compared to that obtained with the conventional scheme. Our results from the applicatoin of acoustic double-difference waveform tomography shows some zones with decreased P-wave velocity within the reservoir due to CO{sub 2} injection and migration.
Joint with application in electrochemical devices
Weil, K Scott [Richland, WA; Hardy, John S [Richland, WA
2010-09-14T23:59:59.000Z
A joint for use in electrochemical devices, such as solid oxide fuel cells (SOFCs), oxygen separators, and hydrogen separators, that will maintain a hermetic seal at operating temperatures of greater than 600.degree. C., despite repeated thermal cycling excess of 600.degree. C. in a hostile operating environment where one side of the joint is continuously exposed to an oxidizing atmosphere and the other side is continuously exposed to a wet reducing gas. The joint is formed of a metal part, a ceramic part, and a flexible gasket. The flexible gasket is metal, but is thinner and more flexible than the metal part. As the joint is heated and cooled, the flexible gasket is configured to flex in response to changes in the relative size of the metal part and the ceramic part brought about by differences in the coefficient of thermal expansion of the metal part and the ceramic part, such that substantially all of the tension created by the differences in the expansion and contraction of the ceramic and metal parts is absorbed and dissipated by flexing the flexible gasket.
Dashboards in Higher UMACRAO/WACRAO Joint
Wisconsin at Madison, University of
Dashboards in Higher Education UMACRAO/WACRAO Joint Conference November 1-3, 2006 Phil Hull charts, pie charts and gauges are usually set in a portal-like environment that is often role for Short Term Decision Making Transactional Current, Unit Record Level Data Used for Daily Operational
The Trade and Climate Change Joint Agenda
The Trade and Climate Change Joint Agenda CEPS Working Document No. 295/June 2008 Thomas L. Brewer Abstract Climate change, international trade, investment and technology transfer are all issues that have............................................................................ 6 3.2 Coverage of the Multilateral Climate and Trade Regimes
Wave Propagation in Jointed Geologic Media
Antoun, T
2009-12-17T23:59:59.000Z
Predictive modeling capabilities for wave propagation in a jointed geologic media remain a modern day scientific frontier. In part this is due to a lack of comprehensive understanding of the complex physical processes associated with the transient response of geologic material, and in part it is due to numerical challenges that prohibit accurate representation of the heterogeneities that influence the material response. Constitutive models whose properties are determined from laboratory experiments on intact samples have been shown to over-predict the free field environment in large scale field experiments. Current methodologies for deriving in situ properties from laboratory measured properties are based on empirical equations derived for static geomechanical applications involving loads of lower intensity and much longer durations than those encountered in applications of interest involving wave propagation. These methodologies are not validated for dynamic applications, and they do not account for anisotropic behavior stemming from direcitonal effects associated with the orientation of joint sets in realistic geologies. Recent advances in modeling capabilities coupled with modern high performance computing platforms enable physics-based simulations of jointed geologic media with unprecedented details, offering a prospect for significant advances in the state of the art. This report provides a brief overview of these modern computational approaches, discusses their advantages and limitations, and attempts to formulate an integrated framework leading to the development of predictive modeling capabilities for wave propagation in jointed and fractured geologic materials.
Jointly organised by HKU CIVIL ENGRG. DEPT.
Tam, Vincent W. L.
SEMINAR Jointly organised by and HKU CIVIL ENGRG. DEPT. Centre for Infrastructure and Construction Industry Development THE USE OF TRENCHLESS TECHNOLOGY FOR THE IMPROVEMENT OF URBAN HABITATS by Ian, vibration, and air pollution. The frustration this causes is aggravated by the knowledge that there often
Wide temperature range seal for demountable joints
Sixsmith, H.; Valenzuela, J.A.; Nutt, W.E.
1991-07-23T23:59:59.000Z
The present invention is directed to a seal for demountable joints operating over a wide temperature range down to liquid helium temperatures. The seal has anti-extrusion guards which prevent extrusion of the soft ductile sealant material, which may be indium or an alloy thereof. 6 figures.
Wide temperature range seal for demountable joints
Sixsmith, Herbert (Norwich, VT); Valenzuela, Javier A. (Grantham, NH); Nutt, William E. (Enfield, NH)
1991-07-23T23:59:59.000Z
The present invention is directed to a seal for demountable joints operating over a wide temperature range down to liquid helium temperatures. The seal has anti-extrusion guards which prevent extrusion of the soft ductile sealant material, which may be indium or an alloy thereof.
Wild Hypersurfaces joint work with Andrew Crabbe
Leuschke, Graham
Wild Hypersurfaces joint work with Andrew Crabbe Graham J. Leuschke gjleusch@math.syr.edu Syracuse University Notre Dame, 6 Nov 2010 , Wild Hypersurfaces, CrabbeÂLeuschke 1/14 #12;Outline Representation types in general Tame and Wild examples MCM modules over hypersurfaces Finite MCM type for hypersurfaces Tame MCM
Andres Loh joint work with Ralf Hinze
Löh, Andres
Trinity Andres L¨oh joint work with Ralf Hinze Utrecht University January 11, 2008 #12;About me Ph), polytypic / datatype-generic programming, type systems (dependent types) Andres L¨oh Trinity 2 #12;What is Trinity? Trinity is a programming language designed by Ralf Hinze and me. It is called Trinity because
Joint News Release ELEVENTH ITER NEGOTIATIONS MEETING
of Science and Technology of China Department of International Co-operation Luo Delong luodl@mail.most.govJoint News Release ELEVENTH ITER NEGOTIATIONS MEETING CHENGDU , CHINA, 24OCTOBER 2005 Delegations from China, European Union, Japan, the Republic of Korea, the Russian Federation and the United States
The Dynamics of Neutrino-Driven Supernova Explosions after Shock Revival in 2D and 3D
Müller, Bernhard
2015-01-01T23:59:59.000Z
We study the growth of the explosion energy after shock revival in neutrino-driven explosions in two and three dimensions (2D/3D) using multi-group neutrino hydrodynamics simulations of an $11.2 M_\\odot$ star. The 3D model shows a faster and steadier growth of the explosion energy and already shows signs of subsiding accretion after one second. By contrast, the growth of the explosion energy in 2D is unsteady, and accretion lasts for several seconds as confirmed by additional long-time simulations of stars of similar masses. Appreciable explosion energies can still be reached, albeit at the expense of rather high neutron star masses. In 2D, the binding energy at the gain radius is larger because the strong excitation of downward-propagating $g$-modes removes energy from the freshly accreted material in the downflows. Consequently, the mass outflow rate is considerably lower in 2D than in 3D. This is only partially compensated by additional heating by outward-propagating acoustic waves in 2D. Moreover, the mas...
OECD/MCCI 2-D Core Concrete Interaction (CCI) tests : final report February 28, 2006.
Farmer, M. T.; Lomperski, S.; Kilsdonk, D. J.; Aeschlimann, R. W.; Basu, S. (Nuclear Engineering Division); (NRC)
2011-05-23T23:59:59.000Z
Although extensive research has been conducted over the last several years in the areas of Core-Concrete Interaction (CCI) and debris coolability, two important issues warrant further investigation. The first issue concerns the effectiveness of water in terminating a CCI by flooding the interacting masses from above, thereby quenching the molten core debris and rendering it permanently coolable. This safety issue was investigated in the EPRI-sponsored Melt Attack and Coolability Experiments (MACE) program. The approach was to conduct large scale, integral-type reactor materials experiments with core melt masses ranging up to two metric tons. These experiments provided unique, and for the most part repeatable, indications of heat transfer mechanism(s) that could provide long term debris cooling. However, the results did not demonstrate definitively that a melt would always be completely quenched. This was due to the fact that the crust anchored to the test section sidewalls in every test, which led to melt/crust separation, even at the largest test section lateral span of 1.20 m. This decoupling is not expected for a typical reactor cavity, which has a span of 5-6 m. Even though the crust may mechanically bond to the reactor cavity walls, the weight of the coolant and the crust itself is expected to periodically fracture the crust and restore contact with the melt. Although crust fracturing does not ensure that coolability will be achieved, it nonetheless provides a pathway for water to recontact the underlying melt, thereby allowing other debris cooling mechanisms to proceed. A related task of the current program, which is not addressed in this particular report, is to measure crust strength to check the hypothesis that a corium crust would not be strong enough to sustain melt/crust separation in a plant accident. The second important issue concerns long-term, two-dimensional concrete ablation by a prototypic core oxide melt. As discussed by Foit the existing reactor material database for dry cavity conditions is solely one-dimensional. Although the MACE Scoping Test was carried out with a two-dimensional concrete cavity, the interaction was flooded soon after ablation was initiated to investigate debris coolability. Moreover, due to the scoping nature of this test, the apparatus was minimally instrumented and therefore the results are of limited value from the code validation viewpoint. Aside from the MACE program, the COTELS test series also investigated 2-D CCI under flooded cavity conditions. However, the input power density for these tests was quite high relative to the prototypic case. Finally, the BETA test series provided valuable data on 2-D core concrete interaction under dry cavity conditions, but these tests focused on investigating the interaction of the metallic (steel) phase with concrete. Due to these limitations, there is significant uncertainty in the partition of energy dissipated for the ablation of concrete in the lateral and axial directions under dry cavity conditions for the case of a core oxide melt. Accurate knowledge of this 'power split' is important in the evaluation of the consequences of an ex-vessel severe accident; e.g., lateral erosion can undermine containment structures, while axial erosion can penetrate the basemat, leading to ground contamination and/or possible containment bypass. As a result of this uncertainty, there are still substantial differences among computer codes in the prediction of 2-D cavity erosion behavior under both wet and dry cavity conditions. In light of the above issues, the OECD-sponsored Melt Coolability and Concrete Interaction (MCCI) program was initiated at Argonne National Laboratory. The project conducted reactor materials experiments and associated analysis to achieve the following technical objectives: (1) resolve the ex-vessel debris coolability issue through a program that focused on providing both confirmatory evidence and test data for the coolability mechanisms identified in MACE integral effects tests, and (2) address remaining uncertainties relat
Computational Study and Analysis of Structural Imperfections in 1D and 2D Photonic Crystals
K.R. Maskaly
2005-06-01T23:59:59.000Z
Dielectric reflectors that are periodic in one or two dimensions, also known as 1D and 2D photonic crystals, have been widely studied for many potential applications due to the presence of wavelength-tunable photonic bandgaps. However, the unique optical behavior of photonic crystals is based on theoretical models of perfect analogues. Little is known about the practical effects of dielectric imperfections on their technologically useful optical properties. In order to address this issue, a finite-difference time-domain (FDTD) code is employed to study the effect of three specific dielectric imperfections in 1D and 2D photonic crystals. The first imperfection investigated is dielectric interfacial roughness in quarter-wave tuned 1D photonic crystals at normal incidence. This study reveals that the reflectivity of some roughened photonic crystal configurations can change up to 50% at the center of the bandgap for RMS roughness values around 20% of the characteristic periodicity of the crystal. However, this reflectivity change can be mitigated by increasing the index contrast and/or the number of bilayers in the crystal. In order to explain these results, the homogenization approximation, which is usually applied to single rough surfaces, is applied to the quarter-wave stacks. The results of the homogenization approximation match the FDTD results extremely well, suggesting that the main role of the roughness features is to grade the refractive index profile of the interfaces in the photonic crystal rather than diffusely scatter the incoming light. This result also implies that the amount of incoherent reflection from the roughened quarterwave stacks is extremely small. This is confirmed through direct extraction of the amount of incoherent power from the FDTD calculations. Further FDTD studies are done on the entire normal incidence bandgap of roughened 1D photonic crystals. These results reveal a narrowing and red-shifting of the normal incidence bandgap with increasing RMS roughness. Again, the homogenization approximation is able to predict these results. The problem of surface scratches on 1D photonic crystals is also addressed. Although the reflectivity decreases are lower in this study, up to a 15% change in reflectivity is observed in certain scratched photonic crystal structures. However, this reflectivity change can be significantly decreased by adding a low index protective coating to the surface of the photonic crystal. Again, application of homogenization theory to these structures confirms its predictive power for this type of imperfection as well. Additionally, the problem of a circular pores in 2D photonic crystals is investigated, showing that almost a 50% change in reflectivity can occur for some structures. Furthermore, this study reveals trends that are consistent with the 1D simulations: parameter changes that increase the absolute reflectivity of the photonic crystal will also increase its tolerance to structural imperfections. Finally, experimental reflectance spectra from roughened 1D photonic crystals are compared to the results predicted computationally in this thesis. Both the computed and experimental spectra correlate favorably, validating the findings presented herein.
ankle joint complex: Topics by E-print Network
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then there exists A S(H)m Li, Chi-Kwong 458 READY FOR TODAY. PREPARING FOR TOMORROW. The Joint Operating Environment is intended to inform joint concept Mathematics Websites...
aluminum aa2024 joints: Topics by E-print Network
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337 389 494 In 1977, 175 joint fishing ventures with the participation-215. In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations...
ankle joint: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
then there exists A S(H)m Li, Chi-Kwong 366 READY FOR TODAY. PREPARING FOR TOMORROW. The Joint Operating Environment is intended to inform joint concept Mathematics Websites...
achieving joint benefits: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
337 389 494 In 1977, 175 joint fishing ventures with the participation-215. In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations...
ankle joint direkte: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
then there exists A S(H)m Li, Chi-Kwong 375 READY FOR TODAY. PREPARING FOR TOMORROW. The Joint Operating Environment is intended to inform joint concept Mathematics Websites...
alpha rotary joint: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
337 389 494 In 1977, 175 joint fishing ventures with the participation-215. In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations...
activities implemented jointly: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
337 389 494 In 1977, 175 joint fishing ventures with the participation-215. In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations...
acromioclavicular joint separations: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
337 389 494 In 1977, 175 joint fishing ventures with the participation-215. In 1981,193 joint ventures with the par- ticipation of Japanese capital were operating in 47 nations...
artificial hip joints: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
this could involve the use of additively Evans, Paul 2 COMPUTATIONAL MODELING OF HIP JOINT MECHANICS CiteSeer Summary: The hip joint is one of the largest weight bearing...
Expansion Joint Concepts for High Temperature Insulation Systems
Harrison, M. R.
1980-01-01T23:59:59.000Z
As high temperature steam and process piping expands with heat, joints begin to open between the insulation sections, resulting in increased energy loss and possible unsafe surface temperatures. Many different expansion joint designs are presently...
Optimal Joint Preventive Maintenance and Production Policies* Xiaodong Yao
Marcus, Steven I.
Optimal Joint Preventive Maintenance and Production Policies* Xiaodong Yao SAS Institute Inc. Cary preventive maintenance (PM) and production policies for an unreliable production-inventory system in which to establish some additional structural properties. Keywords: optimal preventive maintenance, joint maintenance
Mazzucco, Daniel Clarke, 1976-
2003-01-01T23:59:59.000Z
Polyethylene wear is a significant clinical problem limiting the long-term survival of joint replacement prostheses, particularly in total hip arthroplasty (THA) and total knee arthroplasty (TKA). Although the tribology ...
Ward, Karen
of Texas at El Paso, El Paso, Texas 79968-0514, USA 3Department of Geological Sciences, The University) algorithm to characterize 1D earth structure using geophysical datasets with two different optimization
Torres-Verdín, Carlos
in the frequency domain. Synthetic cases consider water-base mud filtrate invading a hydrocarbon-bearing sand-wellbore damage, resulting from drilling and mud-filtrate invasion, can substantially affect sonic and resistivity, with the formation model described by a radial variation of water and hydrocarbon saturations representative of mud
Eidsvik, Jo
,0 Sand,Shale,Sand,kc Sand,zc Sand] and the prior model of is p(). We assume that seismic AVO data. The ultimate goal of this study is to clas- sify lithology/fluid from sesimic AVO data using our stochastic Consider a geological model of a reservoir in one dimension, and the four classes oil-, gas- and brine
Gilligan, Amy; Roecker, Steven W.; Priestley, Keith F.; Nunn, Ceri
2014-07-09T23:59:59.000Z
frame based on the principal component of motion of the incident phase, in order to maximize the energy of the converted mode. Using the nomenclature of Farra & Vinnik (2000) and Vinnik (1977), for P receiver functions this is the (L, H, Q) frame, where... ; the asymmetry in our estimates suggests that sources of noise, partic- ularly in the 5–20 s band, are predominantly from the south. Given that the Arctic Ocean is covered with ice for portions of the year, it is not surprising that noise from the Indian Ocean...
Nunn, Ceri; Roecker, Steven W.; Priestley, Keith F.; Liang, Xiaofeng; Gilligan, Amy
2014-09-01T23:59:59.000Z
for traveltimes at shallow depths. 2 GEOTECTONIC SETT ING At the surface, the Tibetan plateau is a relatively uniform area of ?5 km elevation. Its formation involved numerous collisions, and several major sutures formed during the closure of the Tethys ocean (Fig... . Studies of Sn propagation indicate that Sn energy is more strongly attenuated in the northern plateau in comparison to the south (Ni & Barazangi 1983; McNamara et al. 1995). Barron & Priestley (2009) investigated the propagation of the Sn phase over a...
Joint measurements of spin, operational locality and uncertainty
Erika Andersson; Stephen M. Barnett; Alain Aspect
2005-09-21T23:59:59.000Z
Joint, or simultaneous, measurements of non-commuting observables are possible within quantum mechanics, if one accepts an increase in the variances of the jointly measured observables. In this paper, we discuss joint measurements of a spin 1/2 particle along any two directions. Starting from an operational locality principle, it is shown how to obtain a bound on how sharp the joint measurement can be. We give a direct interpretation of this bound in terms of an uncertainty relation.
Microbial Genomics Data from the DOE Joint Genome Institute (JGI)
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
As of March 2008, The Joint Genome Institute has released 296 Prokaryotic microbial sites, with 216 in finished status.
SPIDERS Joint Capability Technology Demonstration Industry Day Presentations
Broader source: Energy.gov [DOE]
Presentations from the SPIDERS Joint Capability Technology Demonstration Industry Day, which occurred on April 22, 2014, at Fort Carson, Colorado.
Potential inversion with subbarrier fusion data revisited
K. Hagino; Y. Watanabe
2007-06-18T23:59:59.000Z
We invert experimental data for heavy-ion fusion reactions at energies well below the Coulomb barrier in order to directly determine the internucleus potential between the colliding nuclei. In contrast to the previous applications of the inversion formula, we explicitly take into account the effect of channel couplings on fusion reactions, by assuming that fusion cross sections at deep subbarrier energies are governed by the lowest barrier in the barrier distribution. We apply this procedure to the $^{16}$O +$^{144}$Sm and $^{16}$O +$^{208}$Pb reactions, and find that the inverted internucleus potential are much thicker than phenomenological potentials. A relation to the steep fall-off phenomenon of fusion cross sections recently found at deep subbarrier energies is also discussed.
Supersymmetric inversion of effective-range expansions
Bikashkali Midya; Jérémie Evrard; Sylvain Abramowicz; O. L. Ramírez Suárez; Jean-Marc Sparenberg
2015-05-26T23:59:59.000Z
A complete and consistent inversion technique is proposed to derive an accurate interaction potential from an effective-range function for a given partial wave in the neutral case. First, the effective-range function is Taylor or Pad\\'e expanded, which allows high precision fitting of the experimental scattering phase shifts with a minimal number of parameters on a large energy range. Second, the corresponding poles of the scattering matrix are extracted in the complex wave-number plane. Third, the interaction potential is constructed with supersymmetric transformations of the radial Schr\\"odinger equation. As an illustration, the method is applied to the experimental phase shifts of the neutron-proton elastic scattering in the $^1S_0$ and $^1D_2$ channels on the $[0-350]$ MeV laboratory energy interval.
Supersymmetric inversion of effective-range expansions
Midya, Bikashkali; Abramowicz, Sylvain; Suárez, O L Ramírez; Sparenberg, Jean-Marc
2015-01-01T23:59:59.000Z
A complete and consistent inversion technique is proposed to derive an accurate interaction potential from an effective-range function for a given partial wave in the neutral case. First, the effective-range function is Taylor or Pad\\'e expanded, which allows high precision fitting of the experimental scattering phase shifts with a minimal number of parameters on a large energy range. Second, the corresponding poles of the scattering matrix are extracted in the complex wave-number plane. Third, the interaction potential is constructed with supersymmetric transformations of the radial Schr\\"odinger equation. As an illustration, the method is applied to the experimental phase shifts of the neutron-proton elastic scattering in the $^1S_0$ and $^1D_2$ channels on the $[0-350]$ MeV laboratory energy interval.
Supersymmetric inversion of effective-range expansions
Bikashkali Midya; Jérémie Evrard; Sylvain Abramowicz; O. L. Ramírez Suárez; Jean-Marc Sparenberg
2015-01-16T23:59:59.000Z
A complete and consistent inversion technique is proposed to derive an accurate interaction potential from an effective-range function for a given partial wave in the neutral case. First, the effective-range function is Taylor or Pad\\'e expanded, which allows high precision fitting of the experimental scattering phase shifts with a minimal number of parameters on a large energy range. Second, the corresponding poles of the scattering matrix are extracted in the complex wave-number plane. Third, the interaction potential is constructed with supersymmetric transformations of the radial Schr\\"odinger equation. As an illustration, the method is applied to the experimental phase shifts of the neutron-proton elastic scattering in the $^1S_0$ and $^1D_2$ channels on the $[0-350]$ MeV laboratory energy interval.
Inverse Vernier Effects in Coupled Lasers
Ge, Li
2015-01-01T23:59:59.000Z
In this report we study the Vernier effect in coupled laser systems consisting of two cavities. We show that depending on the nature of their coupling, not only can the "supermodes" formed at the overlapping resonances of the coupled cavities have the lowest thresholds and lase first as previously suggested, leading to a manifestation of the typical Vernier effect now in an active system; these supermodes can also have increased thresholds and are hence suppressed, which can be viewed as an inverse Vernier effect. We attribute this effect to detuning-dependent Q-spoiling, and it can lead to an increased free spectrum range and possibly single-mode lasing, which may explain the experimental findings of several previous work. We illustrate this effect using two coupled micro-ring cavities and a micro-ring cavity coupled to a slab cavity, and we discuss its relation to the existence of exceptional points in coupled lasers.
Joint Traffic Blocking and Routing under Network Failures and Maintenances
Liu, Yong
Joint Traffic Blocking and Routing under Network Failures and Maintenances Chao Liang ECE Dept paths. Therefore, it is important to design ingress traffic blocking and routing jointly to achieve a good balance between the two factors. Working towards this goal, we formulate a joint ingress blocking
Joints and Veins Earth Structure (2nd Edition), 2004
ed) 69/12/2010 Ideal joint structure (a) Block diagram showing the various components of an ideal beds, shorter joints, smaller shadows Thus, closer spacing (a) Block diagram illustrating stress shadowJoints and Veins Earth Structure (2nd Edition), 2004 W.W. Norton & Co, New York Slide show by Ben
Guide to Dowel LoadTransfer Systems for Jointed Concrete
Guide to Dowel LoadTransfer Systems for Jointed Concrete Roadway Pavements TECH BRIEF SEPTEMBER 2011 #12;#12;GUIDE TO DOWEL LOAD TRANSFER SYSTEMS FOR JOINTED CONCRETE ROADWAY PAVEMENTS i Technical and Subtitle Guide to Dowel Load Transfer Systems for Jointed Concrete Roadway Pavements 5. Report Date
Kim, Kang Seog [ORNL; Williams, Mark L [ORNL
2012-01-01T23:59:59.000Z
SCALE 6 computes problem-dependent multigroup (MG) cross sections through a combination of the conventional Bondarenko shielding-factor method and a deterministic pointwise (PW) transport calculation of the fine-structure spectra in the resolved resonance and thermal energy ranges. The PW calculation is performed by the CENTRM code using a 1-D cylindrical Wigner-Seitz model with the white boundary condition instead of the real rectangular cell shape to represent a lattice unit cell. The pointwise fluxes computed by CENTRM are not exact because a 1-D model is used for the transport calculation, which introduces discrepancies in the MG self-shielded cross sections, resulting in some deviation in the eigenvalue. In order to solve this problem, the method of characteristics (MOC) has been applied to enable the CENTRM PW transport calculation for a 2-D square pin cell. The computation results show that the new BONAMI/CENTRM-MOC procedure produces very precise self-shielded cross sections compared to MCNP reaction rates.
2d Affine XY-Spin Model/4d Gauge Theory Duality and Deconfinement
Anber, Mohamed M.; Poppitz, Erich; /Toronto U.; Unsal, Mithat; /SLAC /Stanford U., Phys. Dept. /San Francisco State U.
2012-08-16T23:59:59.000Z
We introduce a duality between two-dimensional XY-spin models with symmetry-breaking perturbations and certain four-dimensional SU(2) and SU(2) = Z{sub 2} gauge theories, compactified on a small spatial circle R{sup 1,2} x S{sup 1}, and considered at temperatures near the deconfinement transition. In a Euclidean set up, the theory is defined on R{sup 2} x T{sup 2}. Similarly, thermal gauge theories of higher rank are dual to new families of 'affine' XY-spin models with perturbations. For rank two, these are related to models used to describe the melting of a 2d crystal with a triangular lattice. The connection is made through a multi-component electric-magnetic Coulomb gas representation for both systems. Perturbations in the spin system map to topological defects in the gauge theory, such as monopole-instantons or magnetic bions, and the vortices in the spin system map to the electrically charged W-bosons in field theory (or vice versa, depending on the duality frame). The duality permits one to use the two-dimensional technology of spin systems to study the thermal deconfinement and discrete chiral transitions in four-dimensional SU(N{sub c}) gauge theories with n{sub f} {ge} 1 adjoint Weyl fermions.
A Specification for a Godunov-type Eulerian 2-D Hydrocode, Revision 0
Nystrom, William D [Los Alamos National Laboratory; Robey, Jonathan M [Los Alamos National Laboratory
2012-05-01T23:59:59.000Z
The purpose of this code specification is to describe an algorithm for solving the Euler equations of hydrodynamics in a 2D rectangular region in sufficient detail to allow a software developer to produce an implementation on their target platform using their programming language of choice without requiring detailed knowledge and experience in the field of computational fluid dynamics. It should be possible for a software developer who is proficient in the programming language of choice and is knowledgable of the target hardware to produce an efficient implementation of this specification if they also possess a thorough working knowledge of parallel programming and have some experience in scientific programming using fields and meshes. On modern architectures, it will be important to focus on issues related to the exploitation of the fine grain parallelism and data locality present in this algorithm. This specification aims to make that task easier by presenting the essential details of the algorithm in a systematic and language neutral manner while also avoiding the inclusion of implementation details that would likely be specific to a particular type of programming paradigm or platform architecture.
2D X-ray scanner and its uses in laboratory reservoir characterization measurements
Maloney, D.; Doggett, K.
1997-08-01T23:59:59.000Z
X-ray techniques are used in petroleum laboratories for a variety of reservoir characterization measurements. This paper describes the configuration of a 2D X-ray scanner and many of the ways in which it simplifies and improves accuracy`s of laboratory measurements. Linear X-ray scanners are most often used to provide descriptions of fluid saturations within core plugs during flow tests. We configured our linear scanner for both horizontal and vertical movement. Samples can be scanned horizontally, vertically, or according to horizontal and vertical grids. X-ray measurements are fast, allowing measurements of two- and three-phase fluid saturations during both steady- and unsteady-state flow processes. Rock samples can be scanned while they are subjected to stress, pore pressure, and temperature conditions simulating those of a petroleum reservoir. Many types of measurements are possible by selecting appropriate X-ray power settings, dopes, filters, and collimator configurations. The scanner has been used for a variety of applications besides fluid saturation measurements. It is useful for measuring porosity distributions in rocks, concentrations of X-ray dopes within flow streams during tracer tests, gap widths in fracture flow cells, fluid interface levels in PVT cells and fluid separators, and other features and phenomena.
2D surface temperature measurement of plasma facing components with modulated active pyrometry
Amiel, S.; Loarer, T.; Pocheau, C.; Roche, H.; Gauthier, E.; Aumeunier, M.-H.; Courtois, X.; Jouve, M.; Balorin, C.; Moncada, V. [CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France); Le Niliot, C.; Rigollet, F. [Aix-Marseille Univ, IUSTI, UMR CNRS 7343, F-13453 Marseille (France)
2014-10-15T23:59:59.000Z
In nuclear fusion devices, such as Tore Supra, the plasma facing components (PFC) are in carbon. Such components are exposed to very high heat flux and the surface temperature measurement is mandatory for the safety of the device and also for efficient plasma scenario development. Besides this measurement is essential to evaluate these heat fluxes for a better knowledge of the physics of plasma-wall interaction, it is also required to monitor the fatigue of PFCs. Infrared system (IR) is used to manage to measure surface temperature in real time. For carbon PFCs, the emissivity is high and known (? ? 0.8), therefore the contribution of the reflected flux from environment and collected by the IR cameras can be neglected. However, the future tokamaks such as WEST and ITER will be equipped with PFCs in metal (W and Be/W, respectively) with low and variable emissivities (? ? 0.1–0.4). Consequently, the reflected flux will contribute significantly in the collected flux by IR camera. The modulated active pyrometry, using a bicolor camera, proposed in this paper allows a 2D surface temperature measurement independently of the reflected fluxes and the emissivity. Experimental results with Tungsten sample are reported and compared with simultaneous measurement performed with classical pyrometry (monochromatic and bichromatic) with and without reflective flux demonstrating the efficiency of this method for surface temperature measurement independently of the reflected flux and the emissivity.
3-Phase Recognition Approach to Pseudo 3D Building Generation from 2D Floor Plan
Moloo, Raj Kishen; Auleear, Abu Salmaan
2011-01-01T23:59:59.000Z
Nowadays three dimension (3D) architectural visualisation has become a powerful tool in the conceptualisation, design and presentation of architectural products in the construction industry, providing realistic interaction and walkthrough on engineering products. Traditional ways of implementing 3D models involves the use of specialised 3D authoring tools along with skilled 3D designers with blueprints of the model and this is a slow and laborious process. The aim of this paper is to automate this process by simply analyzing the blueprint document and generating the 3D scene automatically. For this purpose we have devised a 3-Phase recognition approach to pseudo 3D building generation from 2D floor plan and developed a software accordingly. Our 3-phased 3D building system has been implemented using C, C++ and OpenCV library [24] for the Image Processing module; The Save Module generated an XML file for storing the processed floor plan objects attributes; while the Irrlitch [14] game engine was used to impleme...
A Complete Onium Program with R2D at RHIC II
Richard Witt
2006-05-16T23:59:59.000Z
Following on the discovery of a strongly interacting quark-gluon plasma (QGP) at RHIC, a program of detailed quarkonia measurements is crucial to understanding the nature of deconfinement. Lattice QCD calculations suggest a sequential melting of the quarkonia states in the deconfined medium. Such a melting would lead to a suppression in the measured charmonium and bottomonium yields. However, distinguishing a true suppression from shadowing, absorption, and recombination effects requires detailed measurements of the charmonium states (J/psi, psi', and chi_c) and bottomonium states (Y(1S), Y(2S), and Y(3S)). Also, since measurements are needed not only in A+A, but also in p+p for determining primary yields and in p+A for evaluating absorption, the detector should perform well in all collision environments. To fully realize the program outlined above, a new detector will be required at RHIC-II. We present a proposal for a complete quarkonia program and the abilities of a new detector, R2D, to meet the stated requirements. Comparisons will be made with proposed upgrades to existing RHIC detectors and with the upcoming LHC program.
Katoh, Marcus, E-mail: marcus.katoh@uks.eu; Opitz, Armin; Minko, Peter; Massmann, Alexander [University Hospital Saarland, Department of Diagnostic and Interventional Radiology (Germany); Berlich, Joachim [University Hospital Saarland, Department of Radiation Protection (Germany); Buecker, Arno [University Hospital Saarland, Department of Diagnostic and Interventional Radiology (Germany)
2011-06-15T23:59:59.000Z
Purpose: To investigate the value of rotational digital subtraction angiography (rDSA) for evaluation of peripheral and visceral artery stenoses compared to conventional digital subtraction angiography (cDSA). Methods: A phantom study was performed comparing the radiation dose of cDSA with two projections and rDSA by means of the 2D Dynavision technique (Siemens Medical Solutions, Forchheim, Germany). Subsequently, 33 consecutive patients (18 women, 15 men; mean {+-} SD age 67 {+-} 15 years) were examined by both techniques. In total, 63 vessel segments were analyzed by two observers with respect to stenoses, image contrast, and vessel sharpness. Results: Radiation dose was significantly lower with rDSA. cDSA and rDSA revealed 21 and 24 flow-relevant stenotic lesions and vessel occlusions (70-100%), respectively. The same stenosis grade was assessed in 45 segments. By means of rDSA, 10 lesions were judged to have a higher and 8 lesions a lower stenosis grade compared to cDSA. rDSA yielded additive information regarding the vessel anatomy and pathology in 29 segments. However, a tendency toward better image quality and sharper vessel visualization was seen with cDSA. Conclusion: rDSA allows for multiprojection assessment of peripheral and visceral arteries and provides additional clinically relevant information after a single bolus of contrast medium. At the same time, radiation dose can be significantly reduced compared to cDSA.
Look at this: the neural correlates of initiating and responding to bids for joint attention
Redcay, Elizabeth
When engaging in joint attention, one person directs another person's attention to an object (Initiating Joint Attention, IJA), and the second person's attention follows (Responding to Joint Attention, RJA). As such, joint ...
Optical Aharonov-Bohm effect: an inverse hyperbolic problems approach
Gregory Eskin
2007-10-18T23:59:59.000Z
We describe the general setting for the optical Aharonov-Bohm effect based on the inverse problem of the identification of the coefficients of the governing hyperbolic equation by the boundary measurements. We interpret the inverse problem result as a possibility in principle to detect the optical Aharonov-Bohm effect by the boundary measurements.
Anomalous Phase Inversion in Polymer Blends Prepared by Cryogenic Mechanical
, as well as interpenetrating and bicontinu- ous networks.7,8 Phase inversion occurs when the mi- norityAnomalous Phase Inversion in Polymer Blends Prepared by Cryogenic Mechanical Alloying Archie P strategies for producing highly dis- persed multicomponent polymer blends. By their very nature
Wavelet based inversion of gravity data Fabio Boschetti
Boschetti, Fabio
1 Wavelet based inversion of gravity data Fabio Boschetti CSIRO Exploration & Mining and Australian Running Heading: Wavelet based inversion of gravity data #12;2 ABSTRACT The Green's function of the Poisson equation, and its spatial derivatives, lead to a family of wavelets specifically tailored
Inverse Modelling in Geology by Interactive Evolutionary Computation
Boschetti, Fabio
Inverse Modelling in Geology by Interactive Evolutionary Computation Chris Wijns a,b,, Fabio of geological processes, in the absence of established numerical criteria to act as inversion targets, requires evolutionary computation provides for the inclusion of qualitative geological expertise within a rigorous
Inversed Temperature Dependence Aware Clock Skew Scheduling for Sequential
Kuzmanovic, Aleksandar
Inversed Temperature Dependence Aware Clock Skew Scheduling for Sequential Circuits Jieyi Long}@eecs.northwestern.edu Abstract -- We present an Inversed Temperature Dependence (ITD) aware clock skew scheduling framework, we propose an algorithm for synergistic temperature aware clock skew scheduling and dual
Hyperparameter estimation for uncertainty quantification in mesoscale carbon dioxide inversions
Paris-Sud XI, Université de
Hyperparameter estimation for uncertainty quantification in mesoscale carbon dioxide inversions-validation (GCV) and x2 test are compared for the first time under a realistic setting in a mesoscale CO2 estimation, uncertainty quantification, mesoscale carbon dioxide inversions 1. Introduction The atmosphere
THE FUKUSHIMA INVERSE PROBLEM Marta Martinez-Camara, Ivan Dokmanic,
Vetterli, Martin
THE FUKUSHIMA INVERSE PROBLEM Marta Martinez-Camara, Ivan Dokmani´c, Juri Ranieri, Robin Scheibler material was released from Fukushima in March 2011 is crucial to understand the scope of the consequences regular- ization that solves the Fukushima inverse problem blindly. Together with the atmospheric
Lithology-Fluid Inversion based on Prestack Seismic Data
Eidsvik, Jo
Lithology-Fluid Inversion based on Prestack Seismic Data Marit Ulvmoen Summary The focus of the study is on lithology-fluid inversion from prestack seismic data. The target zone is a 3D reservoir model. The likelihood model relates the lithology-fluid classes to elastic variables and the seismic
Computationally Efficient Regularized Inversion for Highly Parameterized MODFLOW Models
Barrash, Warren
. INTRODUCTION The inverse problem in groundwater modeling is generally ill-posed and non-unique. The typical geological heterogeneity has not been possible in common groundwater modeling practice. The principal reasons-Marquardt methods, and (3) lack of experience within the groundwater modeling community with regularized inversion
Grucker, J.; Baudon, J.; Karam, J.-C.; Perales, F.; Ducloy, M. [Laboratoire de Physique des Lasers, UMR-CNRS 7538, Universite Paris 13, 99, Avenue J.B. Clement, 93430-Villetaneuse (France); Bocvarski, V. [Institute of Physics, Pregrevica 118, 11080 - Belgrade-Zemun (Serbia and Montenegro)
2007-04-23T23:59:59.000Z
1D and 2D reflection gratings (Permalloy stripes or dots deposited on silicon), immersed in an external homogeneous static magnetic field, are used to study 1D and 2D diffraction of fast metastable helium atoms He* (23S1). Both the grazing incidence used here and the repulsive potential (for sub-level m = -1) generated by the magnetisation reduce the quenching effect. This periodically structured potential is responsible for the diffraction in the incidence plane as well as for the diffraction in the perpendicular plane.
Rational reductions of the 2D-Toda hierarchy and mirror symmetry
Andrea Brini; Guido Carlet; Stefano Romano; Paolo Rossi
2014-04-14T23:59:59.000Z
We introduce and study a two-parameter family of symmetry reductions of the two-dimensional Toda lattice hierarchy, which are characterized by a rational factorization of the Lax operator into a product of an upper diagonal and the inverse of a lower diagonal formal difference operator. They subsume and generalize several classical 1 + 1 integrable hierarchies, such as the bigraded Toda hierarchy, the Ablowitz-Ladik hierarchy and E. Frenkel's q-deformed Gelfand-Dickey hierarchy. We establish their characterization in terms of block Toeplitz matrices for the associated factorization problem, and study their Hamiltonian structure. At the dispersionless level, we show how the Takasaki-Takebe classical limit gives rise to a family of non-conformal Frobenius manifolds with flat identity. We use this to generalize the relation of the Ablowitz-Ladik hierarchy to Gromov-Witten theory by proving an analogous mirror theorem for rational reductions: in particular, we show that the dual-type Frobenius manifolds we obtain are isomorphic to the equivariant quantum cohomology of a family of toric Calabi-Yau threefolds obtained from minimal resolutions of the local orbifold line.
Adhesive joint and composites modeling in SIERRA.
Ohashi, Yuki; Brown, Arthur A.; Hammerand, Daniel Carl; Adolf, Douglas Brian; Chambers, Robert S.; Foulk, James W., III (.,; )
2005-11-01T23:59:59.000Z
Polymers and fiber-reinforced polymer matrix composites play an important role in many Defense Program applications. Recently an advanced nonlinear viscoelastic model for polymers has been developed and incorporated into ADAGIO, Sandia's SIERRA-based quasi-static analysis code. Standard linear elastic shell and continuum models for fiber-reinforced polymer-matrix composites have also been added to ADAGIO. This report details the use of these models for advanced adhesive joint and composites simulations carried out as part of an Advanced Simulation and Computing Advanced Deployment (ASC AD) project. More specifically, the thermo-mechanical response of an adhesive joint when loaded during repeated thermal cycling is simulated, the response of some composite rings under internal pressurization is calculated, and the performance of a composite container subjected to internal pressurization, thermal loading, and distributed mechanical loading is determined. Finally, general comparisons between the continuum and shell element approaches for modeling composites using ADAGIO are given.
Diesel combustion and emissions formation using multiple 2-D imaging diagnostics
Dec, J.E. [Sandia National Labs., Livermore, CA (United States)
1997-12-31T23:59:59.000Z
Understanding how emissions are formed during diesel combustion is central to developing new engines that can comply with increasingly stringent emission standards while maintaining or improving performance levels. Laser-based planar imaging diagnostics are uniquely capable of providing the temporally and spatially resolved information required for this understanding. Using an optically accessible research engine, a variety of two-dimensional (2-D) imaging diagnostics have been applied to investigators of direct-injection (DI) diesel combustion and emissions formation. These optical measurements have included the following laser-sheet imaging data: Mie scattering to determine liquid-phase fuel distributions, Rayleigh scattering for quantitative vapor-phase-fuel/air mixture images, laser induced incandescence (LII) for relative soot concentrations, simultaneous LII and Rayleigh scattering for relative soot particle-size distributions, planar laser-induced fluorescence (PLIF) to obtain early PAH (polyaromatic hydrocarbon) distributions, PLIF images of the OH radical that show the diffusion flame structure, and PLIF images of the NO radical showing the onset of NO{sub x} production. In addition, natural-emission chemiluminescence images were obtained to investigate autoignition. The experimental setup is described, and the image data showing the most relevant results are presented. Then the conceptual model of diesel combustion is summarized in a series of idealized schematics depicting the temporal and spatial evolution of a reacting diesel fuel jet during the time period investigated. Finally, recent PLIF images of the NO distribution are presented and shown to support the timing and location of NO formation hypothesized from the conceptual model.
Clustering of 2PIGG galaxy groups with 2dFGRS galaxies
Georgios Mountrichas; Tom Shanks
2007-12-19T23:59:59.000Z
Prompted by indications from QSO lensing that there may be more mass associated with galaxy groups than expected, we have made new dynamical infall estimates of the masses associated with 2PIGG groups and clusters. We have analysed the redshift distortions in the cluster-galaxy cross-correlation function as a function of cluster membership, cross-correlating z<0.12 2PIGG clusters and groups with the full 2dF galaxy catalogue. We have made estimates of the dynamical infall parameter beta and new estimates of the group velocity dispersions. We first find that the amplitude of the full 3-D redshift space cross-correlation function, xi_{cg}, rises monotonically with group membership. We use a simple linear-theory infall model to fit xi(sigma, pi) in the range 5
Skeleton as a probe of the cosmic web: the 2D case
Dimitri Novikov; Stephane Colombi; Olivier Doré
2003-06-30T23:59:59.000Z
We discuss the skeleton as a probe of the filamentary structures of a 2D random field. It can be defined for a smooth field as the ensemble of pairs of field lines departing from saddle points, initially aligned with the major axis of local curvature and connecting them to local maxima. This definition is thus non local and makes analytical predictions difficult, so we propose a local approximation: the local skeleton is given by the set of points where the gradient is aligned with the local curvature major axis and where the second component of the local curvature is negative. We perform a statistical analysis of the length of the total local skeleton, chosen for simplicity as the set of all points of space where the gradient is either parallel or orthogonal to the main curvature axis. In all our numerical experiments, which include Gaussian and various non Gaussian realizations such as \\chi^2 fields and Zel'dovich maps, the differential length is found within a normalization factor to be very close to the probability distribution function of the smoothed field. This is in fact explicitly demonstrated in the Gaussian case. This result might be discouraging for using the skeleton as a probe of non Gausiannity, but our analyses assume that the total length of the skeleton is a free, adjustable parameter. This total length could in fact be used to constrain cosmological models, in CMB maps but also in 3D galaxy catalogs, where it estimates the total length of filaments in the Universe. Making the link with other works, we also show how the skeleton can be used to study the dynamics of large scale structure.