Fast Approximate Convex Decomposition
Ghosh, Mukulika
2012-10-19T23:59:59.000Z
: D(M) = Mij[iMi = Mand 8i 6=jM i \\M j = ; (3.1) where M i is the open set of Mi, i.e.,Mi excluding its boundary. De nition .2 The cuts fCig in a decomposition D of a model M , are the maxi- mal boundaries of the components Mi...
u.s. Wea.ther Bureau. Hurricane Helena. Sept. 2S-29. 1958.
QC 945.2 .H45 H8 1958 u.s. Wea.ther Bureau. Hurricane Helena. Sept. 2S-29. 1958. #12;National;PRELIMINARY REPORT, HURRICANE HELENE SEPTEMBER 23-29, 1958 Hurricane Helene, one of the most dangerous to hurricane strength by the next day. It continued to intensify and advanced on a slow and somewhat erratic
Obesity & Weight Loss Therapy Krakauer and Krakauer, J Obes Weight Loss Ther 2014, 4:2
Krakauer, Nir Y.
Obesity & Weight Loss Therapy Krakauer and Krakauer, J Obes Weight Loss Ther 2014, 4:2 http the original author and source are credited. Keywords: Waist circumference; Body shape index; Obesity Introduction Obesity has historically been a sign of good health, except at the greatestexcess[1
Qu sucede con esta imagen? Crculo las diez cosas mal en la
¿Qué sucede con esta imagen? Círculo las diez cosas mal en la foto. Cocina Temperatura caliente limpio #12;¿Qué sucede con esta imagen? -"Servir comida segura" Clave 1. Caliente explotación por debajo
Fast Approximate Convex Decomposition
Ghosh, Mukulika
2012-10-19T23:59:59.000Z
Approximate convex decomposition (ACD) is a technique that partitions an input object into "approximately convex" components. Decomposition into approximately convex pieces is both more efficient to compute than exact ...
Spectral proper orthogonal decomposition
Sieber, Moritz; Paschereit, Christian Oliver
2015-01-01T23:59:59.000Z
The identification of coherent structures from experimental or numerical data is an essential task when conducting research in fluid dynamics. This typically involves the construction of an empirical mode base that appropriately captures the dominant flow structures. The most prominent candidates are the energy-ranked proper orthogonal decomposition (POD) and the frequency ranked Fourier decomposition and dynamic mode decomposition (DMD). However, these methods fail when the relevant coherent structures occur at low energies or at multiple frequencies, which is often the case. To overcome the deficit of these "rigid" approaches, we propose a new method termed Spectral Proper Orthogonal Decomposition (SPOD). It is based on classical POD and it can be applied to spatially and temporally resolved data. The new method involves an additional temporal constraint that enables a clear separation of phenomena that occur at multiple frequencies and energies. SPOD allows for a continuous shifting from the energetically ...
Inman, Richard Headen
2012-01-01T23:59:59.000Z
and operation of solar power plants and the model- ing offor application to solar ther- mal power plants energy
Multicriteria approximation through decomposition
Burch, C. [Carnegie Mellon Univ., Pittsburgh, PA (United States). School of Computer Sciences]|[Sandia National Labs., Albuquerque, NM (United States); Krumke, S. [Univ. of Wuerzburg (Germany). Dept. of Computer Science; Marathe, M. [Los Alamos National Lab., NM (United States); Phillips, C. [Sandia National Labs., Albuquerque, NM (United States). Applied Mathematics Dept.; Sundberg, E. [Rutgers Univ., NJ (United States). Dept. of Computer Science]|[Sandia National Labs., Albuquerque, NM (United States)
1997-12-01T23:59:59.000Z
The authors propose a general technique called solution decomposition to devise approximation algorithms with provable performance guarantees. The technique is applicable to a large class of combinatorial optimization problems that can be formulated as integer linear programs. Two key ingredients of the technique involve finding a decomposition of a fractional solution into a convex combination of feasible integral solutions and devising generic approximation algorithms based on calls to such decompositions as oracles. The technique is closely related to randomized rounding. The method yields as corollaries unified solutions to a number of well studied problems and it provides the first approximation algorithms with provable guarantees for a number of new problems. The particular results obtained in this paper include the following: (1) The authors demonstrate how the technique can be used to provide more understanding of previous results and new algorithms for classical problems such as Multicriteria Spanning Trees, and Suitcase Packing. (2) They show how the ideas can be extended to apply to multicriteria optimization problems, in which they wish to minimize a certain objective function subject to one or more budget constraints. As corollaries they obtain first non-trivial multicriteria approximation algorithms for problems including the k-Hurdle and the Network Inhibition problems.
Multicriteria approximation through decomposition
Burch, C. [Carnegie Mellon Univ., Pittsburgh, PA (United States). School of Computer Science; Krumke, S. [Univ. of Wuerzburg (Germany). Dept. of Computer Science; Marathe, M. [Los Alamos National Lab., NM (United States); Phillips, C. [Sandia National Labs., Albuquerque, NM (United States). Applied Mathematics Dept.; Sundberg, E. [Rutgers Univ., NJ (United States). Dept. of Computer Science
1998-06-01T23:59:59.000Z
The authors propose a general technique called solution decomposition to devise approximation algorithms with provable performance guarantees. The technique is applicable to a large class of combinatorial optimization problems that can be formulated as integer linear programs. Two key ingredients of their technique involve finding a decomposition of a fractional solution into a convex combination of feasible integral solutions and devising generic approximation algorithms based on calls to such decompositions as oracles. The technique is closely related to randomized rounding. Their method yields as corollaries unified solutions to a number of well studied problems and it provides the first approximation algorithms with provable guarantees for a number of new problems. The particular results obtained in this paper include the following: (1) the authors demonstrate how the technique can be used to provide more understanding of previous results and new algorithms for classical problems such as Multicriteria Spanning Trees, and Suitcase Packing; (2) they also show how the ideas can be extended to apply to multicriteria optimization problems, in which they wish to minimize a certain objective function subject to one or more budget constraints. As corollaries they obtain first non-trivial multicriteria approximation algorithms for problems including the k-Hurdle and the Network Inhibition problems.
L'alg`ebre de decomposition universelle (Universal Decomposition Algebra)
Lombardi, Henri
L'alg`ebre de d´ecomposition universelle (Universal Decomposition Algebra) Gema M. Diaz-Toca Henri`e- bre de Boole munie d'un groupe d'automorphismes. Ceci s'applique en particulier `a l'alg`ebre 1 #12;de Boole des idempotents d'une alg`ebre de d´ecomposition universelle ou plus g´en´eralement d'une alg
O'Keefe, Dennis R. (San Diego, CA); Norman, John H. (San Diego, CA)
1983-01-01T23:59:59.000Z
Liquid hydrogen iodide is decomposed to form hydrogen and iodine in the presence of water using a soluble catalyst. Decomposition is carried out at a temperature between about 350.degree. K. and about 525.degree. K. and at a corresponding pressure between about 25 and about 300 atmospheres in the presence of an aqueous solution which acts as a carrier for the homogeneous catalyst. Various halides of the platinum group metals, particularly Pd, Rh and Pt, are used, particularly the chlorides and iodides which exhibit good solubility. After separation of the H.sub.2, the stream from the decomposer is countercurrently extracted with nearly dry HI to remove I.sub.2. The wet phase contains most of the catalyst and is recycled directly to the decomposition step. The catalyst in the remaining almost dry HI-I.sub.2 phase is then extracted into a wet phase which is also recycled. The catalyst-free HI-I.sub.2 phase is finally distilled to separate the HI and I.sub.2. The HI is recycled to the reactor; the I.sub.2 is returned to a reactor operating in accordance with the Bunsen equation to create more HI.
Erbium hydride decomposition kinetics.
Ferrizz, Robert Matthew
2006-11-01T23:59:59.000Z
Thermal desorption spectroscopy (TDS) is used to study the decomposition kinetics of erbium hydride thin films. The TDS results presented in this report are analyzed quantitatively using Redhead's method to yield kinetic parameters (E{sub A} {approx} 54.2 kcal/mol), which are then utilized to predict hydrogen outgassing in vacuum for a variety of thermal treatments. Interestingly, it was found that the activation energy for desorption can vary by more than 7 kcal/mol (0.30 eV) for seemingly similar samples. In addition, small amounts of less-stable hydrogen were observed for all erbium dihydride films. A detailed explanation of several approaches for analyzing thermal desorption spectra to obtain kinetic information is included as an appendix.
The combinatorics of reduced decompositions
Tenner, Bridget Eileen
2006-01-01T23:59:59.000Z
This thesis examines several aspects of reduced decompositions in finite Coxeter groups. Effort is primarily concentrated on the symmetric group, although some discussions are subsequently expanded to finite Coxeter groups ...
DOMAIN DECOMPOSITION FOR A MIXED FINITE ELEMENT ...
SIAM (#1) 1035 2001 Apr 10 12:32:38
2003-03-12T23:59:59.000Z
... porous media, where highly discontinuous conductivity coefficients are also ...... [14] B. Smith, P. Bjørstad, and W. Gropp, Domain Decomposition, Cambridge
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
Stability of the Trotter-Suzuki decomposition
Ish Dhand; Barry C. Sanders
2014-07-09T23:59:59.000Z
The Trotter-Suzuki decomposition is an important tool for the simulation and control of physical systems. We provide evidence for the stability of the Trotter-Suzuki decomposition. We model the error in the decomposition and determine sufficiency conditions that guarantee the stability of this decomposition under this model. We relate these sufficiency conditions to precision limitations of computing and control in both classical and quantum cases. Furthermore we show that bounded-error Trotter-Suzuki decomposition can be achieved by a suitable choice of machine precision.
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
has been licensed non-exclusively to POCO Graphite of Decatur, Texas. Applications for graphite foam include ther- mal management for notebook computers, automobile batteries,...
2013-01-01T23:59:59.000Z
transports from ocean to land and global energy ?ows inof Earth energy imbal- ance, ocean warming, and thermostericthe ther- mal energy of the ocean, it remains a challenging
Princeton Univer sity Plasma Physics Laboratory
:ment of better coal fired syste:ms in recent years to raise the ther:mal efficiency from· 35 to 41 percent
ON THE ISOTYPIC DECOMPOSITION OF COHOMOLOGY ...
2015-03-20T23:59:59.000Z
Mar 20, 2015 ... Primary 14P10, 14P25; Secondary 68W30. Key words and phrases. Symmetric group, isotypic decomposition, semi-algebraic sets, Specht.
Generalized covariation and extended Fukushima decompositions for Banach valued processes.
Paris-Sud XI, Université de
Generalized covariation and extended Fukushima decompositions for Banach valued processes corresponding results when B = C([-, 0]) and X = X(·). This will consitute a significant Fukushima decomposition random variables, Malliavin calculus, Generalized Fukushima decomposition. LUISS Guido Carli - Libera
Interactive simulation of fire, burn and decomposition
Melek, Zeki
2008-10-10T23:59:59.000Z
This work presents an approach to effectively integrate into one unified modular fire simulation framework the major processes related to fire, namely: a burning process, chemical combustion, heat distribution, decomposition and deformation...
Interactive simulation of fire, burn and decomposition
Melek, Zeki
2009-05-15T23:59:59.000Z
This work presents an approach to effectively integrate into one unified modular fire simulation framework the major processes related to fire, namely: a burning process, chemical combustion, heat distribution, decomposition and deformation...
Network With Costs: Timing and Flow Decomposition
Ho, Tracey
Network With Costs: Timing and Flow Decomposition Shreeshankar Bodas, Jared Grubb, Sriram Sridharan, Tracey Ho, Sriram Vishwanath {bodas, grubb, sridhara, sriram}@ece.utexas.edu, tho@caltech.edu Abstract
Decomposition of forest products buried in landfills
Wang, Xiaoming, E-mail: xwang25@ncsu.edu [Department of Civil, Construction, and Environmental Engineering, Campus Box 7908, North Carolina State University, Raleigh, NC 27695-7908 (United States); Padgett, Jennifer M. [Department of Civil, Construction, and Environmental Engineering, Campus Box 7908, North Carolina State University, Raleigh, NC 27695-7908 (United States); Powell, John S. [Department of Chemical and Biomolecular Engineering, Campus Box 7905, North Carolina State University, Raleigh, NC 27695-7905 (United States); Barlaz, Morton A. [Department of Civil, Construction, and Environmental Engineering, Campus Box 7908, North Carolina State University, Raleigh, NC 27695-7908 (United States)
2013-11-15T23:59:59.000Z
Highlights: • This study tracked chemical changes of wood and paper in landfills. • A decomposition index was developed to quantify carbohydrate biodegradation. • Newsprint biodegradation as measured here is greater than previous reports. • The field results correlate well with previous laboratory measurements. - Abstract: The objective of this study was to investigate the decomposition of selected wood and paper products in landfills. The decomposition of these products under anaerobic landfill conditions results in the generation of biogenic carbon dioxide and methane, while the un-decomposed portion represents a biogenic carbon sink. Information on the decomposition of these municipal waste components is used to estimate national methane emissions inventories, for attribution of carbon storage credits, and to assess the life-cycle greenhouse gas impacts of wood and paper products. Hardwood (HW), softwood (SW), plywood (PW), oriented strand board (OSB), particleboard (PB), medium-density fiberboard (MDF), newsprint (NP), corrugated container (CC) and copy paper (CP) were buried in landfills operated with leachate recirculation, and were excavated after approximately 1.5 and 2.5 yr. Samples were analyzed for cellulose (C), hemicellulose (H), lignin (L), volatile solids (VS), and organic carbon (OC). A holocellulose decomposition index (HOD) and carbon storage factor (CSF) were calculated to evaluate the extent of solids decomposition and carbon storage. Samples of OSB made from HW exhibited cellulose plus hemicellulose (C + H) loss of up to 38%, while loss for the other wood types was 0–10% in most samples. The C + H loss was up to 81%, 95% and 96% for NP, CP and CC, respectively. The CSFs for wood and paper samples ranged from 0.34 to 0.47 and 0.02 to 0.27 g OC g{sup ?1} dry material, respectively. These results, in general, correlated well with an earlier laboratory-scale study, though NP and CC decomposition measured in this study were higher than previously reported.
CHARACTERIZATION OF THE GASEOUS AND SOLID PRODUCTS OF DECOMPOSITION OF ALUMINUM SULFATE
Knutsen, G.F.
2010-01-01T23:59:59.000Z
OF DECOMPOSITION OF ALUMINUM SULFATE Gary F. Knutsen (M. S.OF DECOMPOSITION OF ALUMINUM SULFATE Contents Abstract . .OF DECOMPOSITION OF ALUMINUM SULFATE Gary F. Knutsen
PRESCRIBED GAUSS DECOMPOSITION FOR KAC-MOODY GROUPS OVER FIELDS.
PRESCRIBED GAUSS DECOMPOSITION FOR KAC-MOODY GROUPS OVER FIELDS University 52900, Ramat Gan, ISRAEL Abstract. We will show the Gauss. 1.Introduction Kac-Moody groups are equipped with canonical decompositions of different kinds
Thermal decomposition study of hydroxylamine nitrate during storage and handling
Zhang, Chuanji
2007-09-17T23:59:59.000Z
decomposition behavior under various conditions and proposed isothermal aging testing and kinetic-based simulation to determine safety boundaries for HAN storage and handling. Specifically, HAN decomposition in the presence of glass, titanium, stainless steel...
A parallel interior point decomposition algorithm for block angular ...
2008-05-24T23:59:59.000Z
a parallel and distributed high performance computing environment. We compare our. MPI (Message Passing Interface) implementation of the decomposition ...
ccsd00001360, Natural decomposition of processes
, Poland #3;#3;#3; IRMAR, Universit#19;e de Rennes 1 Campus de Beaulieu, 35042 Rennes Cedex, France process has #12;nite energy, as de#12;ned by Graversen and Rao, its Doob-Meyer type decomposition, semimartin- gales, #12;nite energy processes, quadratic variation, mutual quadratic covari- ation, Ito
Large power grid analysis using domain decomposition
Mohanram, Kartik
Large power grid analysis using domain decomposition Quming Zhou, Kai Sun, Kartik Mohanram, Danny C referred to as the power grid. The power grid for a modern integrated circuit may consist of several grid is traditionally described as a large-scale linear system. Simulation of power grids usually
Graph Decompositions and Secret Sharing Schemes 1
Stinson, Douglas
Graph Decompositions and Secret Sharing Schemes 1 C. Blundo and A. De Santis Dipartimento di In this paper, we continue a study of secret sharing schemes for access structures based on graphs. Given a graph G, we require that a subset of participants can compute a secret key if they contain an edge of G
Finite element decomposition of the human neocortex
Chow, Seeling
1998-01-01T23:59:59.000Z
Relationships between iso-parametric curves and principal curvature directions, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . ?. ???, . ?. . . . . . . . . . ??. ?. 25 Reparameterizing macro elements for finite element decomposition... . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . 33 Front, top, bottom, left, and right views of the reconstructed neocortex cut through the coronal plane at 38mm from the back, FIGURE Page 34 Middle Temporal Gyrus extracted from the Delaunay triangulation of the neocortex of the right...
Decomposition method for the Multiperiod Blending Problem
Grossmann, Ignacio E.
Decomposition method for the Multiperiod Blending Problem Francisco Trespalacios, Irene Lotero Engineering Carnegie Mellon University Pittsburgh, PA 15213 #12;2 Motivation and goals Multiperiod blending problem is a general model for many applications, and it is difficult to solve · Gasoline and crude oil
Decomposition method for the Multiperiod Blending Problem
Grossmann, Ignacio E.
for many applications 4 · Gasoline and crude oil blending · Raw material feed scheduling · StorageDecomposition method for the Multiperiod Blending Problem Irene Lotero, Francisco Trespalacios algorithm #12;Supply Tanks (s) Blending Tanks (b) Demand Tanks (d) Multiperiod blending problem is defined
Decomposition of amino diazeniumdiolates (NONOates): Molecular mechanisms
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Shaikh, Nizamuddin [Brookhaven National Laboratory, Chemistry Dept, Upton, NY (United States); Valiev, Marat [Pacific Northwest National Laboratory, William R. Wiley Environmental Molecular Sciences Laboratory, Richland, WA (United States); Lymar, Sergei V. [Brookhaven National Laboratory, Chemistry Dept, Upton, NY (United States)
2014-12-01T23:59:59.000Z
Although diazeniumdiolates (X[N(O)NO]?) are extensively used in biochemical, physiological, and pharmacological studies due to their ability to release NO and/or its congeneric nitroxyl, the mechanisms of these processes remain obscure. In this work, we used a combination of spectroscopic, kinetic, and computational techniques to arrive at a quantitatively consistent molecular mechanism for decomposition of amino diazeniumdiolates (amino NONOates: R2N[N(O)NO]?, where R = single bondN(C2H5)2 (1), single bondN(C3H4NH2)2 (2), or single bondN(C2H4NH2)2 (3)). Decomposition of these NONOates is triggered by protonation of their [NN(O)NO]? group with the apparent pKa and decomposition rate constants of 4.6 and 1 s? 1 for 1; 3.5 and 0.083 s? 1 for 2; and 3.8 and 0.0033 s? 1 for 3. Although protonation occurs mainly on the O atoms of the functional group, only the minor R2N(H)N(O)NO tautomer (population ~ 10? 7, for 1) undergoes the Nsingle bondN heterolytic bond cleavage (kd ~ 107 s? 1 for 1) leading to amine and NO. Decompositions of protonated amino NONOates are strongly temperature-dependent; activation enthalpies are 20.4 and 19.4 kcal/mol for 1 and 2, respectively, which includes contributions from both the tautomerization and bond cleavage. The bond cleavage rates exhibit exceptional sensitivity to the nature of R substituents which strongly modulate activation entropy. At pH < 2, decompositions of all three NONOates that have been investigated are subject to additional acid catalysis that occurs through di-protonation of the [NN(O)NO]? group.
Decomposition of amino diazeniumdiolates (NONOates): Molecular mechanisms
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Shaikh, Nizamuddin; Valiev, Marat; Lymar, Sergei V.
2014-12-01T23:59:59.000Z
Although diazeniumdiolates (X[N(O)NO]?) are extensively used in biochemical, physiological, and pharmacological studies due to their ability to release NO and/or its congeneric nitroxyl, the mechanisms of these processes remain obscure. In this work, we used a combination of spectroscopic, kinetic, and computational techniques to arrive at a quantitatively consistent molecular mechanism for decomposition of amino diazeniumdiolates (amino NONOates: R2N[N(O)NO]?, where R = single bondN(C2H5)2 (1), single bondN(C3H4NH2)2 (2), or single bondN(C2H4NH2)2 (3)). Decomposition of these NONOates is triggered by protonation of their [NN(O)NO]? group with the apparent pKa and decomposition rate constants of 4.6 and 1 s? 1 for 1;more »3.5 and 0.083 s? 1 for 2; and 3.8 and 0.0033 s? 1 for 3. Although protonation occurs mainly on the O atoms of the functional group, only the minor R2N(H)N(O)NO tautomer (population ~ 10? 7, for 1) undergoes the Nsingle bondN heterolytic bond cleavage (kd ~ 107 s? 1 for 1) leading to amine and NO. Decompositions of protonated amino NONOates are strongly temperature-dependent; activation enthalpies are 20.4 and 19.4 kcal/mol for 1 and 2, respectively, which includes contributions from both the tautomerization and bond cleavage. The bond cleavage rates exhibit exceptional sensitivity to the nature of R substituents which strongly modulate activation entropy. At pH « less
Approximate convex decomposition and its applications
Lien, Jyh-Ming
2009-05-15T23:59:59.000Z
hull CHP . : : : : : : : : : : : : : : : : : : : : : : : : 12 xi FIGURE Page 9 (a) Decomposition process. The tolerable concavity is user in- put. (b) A hierarchical representation of polygon P. Vertex r is a notch and concavity is measured... as the distance to the convex hull CHP . : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 20 10 Although polygon P1 is visually closer to being convex than poly- gon P2, this is not identi ed by their convexity measurements, as de ned in Eqn 7...
Decomposition of amino diazeniumdiolates (NONOates): Molecular mechanisms
Shaikh, Nizamuddin [Brookhaven National Laboratory, Chemistry Dept, Upton, NY (United States); Valiev, Marat [Pacific Northwest National Laboratory, William R. Wiley Environmental Molecular Sciences Laboratory, Richland, WA (United States); Lymar, Sergei V. [Brookhaven National Laboratory, Chemistry Dept, Upton, NY (United States)
2014-12-01T23:59:59.000Z
Although diazeniumdiolates (X[N(O)NO]^{-}) are extensively used in biochemical, physiological, and pharmacological studies due to their ability to release NO and/or its congeneric nitroxyl, the mechanisms of these processes remain obscure. In this work, we used a combination of spectroscopic, kinetic, and computational techniques to arrive at a quantitatively consistent molecular mechanism for decomposition of amino diazeniumdiolates (amino NONOates: R_{2}N[N(O)NO]^{-}, where R = —N(C_{2}H_{5})_{2}(1), —N(C_{3}H_{4}NH_{2})_{2}(2), or —N(C_{2}H_{4}NH_{2})_{2}(3)). Decomposition of these NONOates is triggered by protonation of their [NN(O)NO]^{-} group with the apparent pKa and decomposition rate constants of 4.6 and 1 s^{-1} for 1; 3.5 and 0.083 s^{-1} for 2; and 3.8 and 0.0033 s^{-1} for 3. Although protonation occurs mainly on the O atoms of the functional group, only the minor R_{2}N(H)N(O)NO tautomer (population ~ 10^{-7}, for 1) undergoes the N—N heterolytic bond cleavage (k_{d} ~ 107 s^{-1} for 1) leading to amine and NO. Decompositions of protonated amino NONOates are strongly temperature-dependent; activation enthalpies are 20.4 and 19.4 kcal/mol for 1 and 2, respectively, which includes contributions from both the tautomerization and bond cleavage. The bond cleavage rates exhibit exceptional sensitivity to the nature of R substituents which strongly modulate activation entropy. At pH < 2, decompositions of all three NONOates that have been investigated are subject to additional acid catalysis that occurs through di-protonation of the [NN(O)NO]^{-} group.
Kinetics of thermal decomposition of surrogate solid wastes
Missoum, A.; Gupta, A.K.; Chen, J. [Univ. of Maryland, College Park, MD (United States); Keating, E.L. [Naval Surface Warfare Center, Annapolis, MD (United States)
1996-12-31T23:59:59.000Z
Decomposition behavior of different materials in a controlled environment at different heating rates are presented. The surrogate materials used are cellulose, polyethylene, polystyrene, polypropylene, nylon and bisphenol-A-polycarbonate. A series of tests were performed using a Perkin-Elmer 7 series thermal analysis system. Two heating rates of 10 C/minute and 100 C/minute were used. The temperature dependence and mass load characteristics of materials was obtained and used to obtain Arrhenius kinetic parameters and therefore the decomposition rates under defined conditions of pressure, temperature, environment, heating rate and waste composition. This information is helpful in characterizing and understanding the thermal decomposition properties of these materials during their thermal destruction. The decomposition rates are affected by the heating rate. The higher the heating rate the faster the decomposition. The results show that an increase in heating rate shifted thermal decomposition to higher temperatures and that the temperature at which maximum devolatilization began and ended was affected by heating rate. The kinetic parameters were calculated and the char yield from the different samples was less than 2% by weight except for polycarbonate which was around 5%. The remaining char in nylon and polycarbonate is attributed to the inert impurities in these materials. The thermal decomposition of the materials studied here could be related to their composition. It was found that polyethylene, polypropylene and polycarbonate have comparable decomposition rates over the same temperature range. Cellulose has the lowest decomposition rate and polystyrene has the highest.
Software Architecture Decomposition Using Attributes Chung-Horng Lung
Lung, Chung-Horng
1 Software Architecture Decomposition Using Attributes Chung-Horng Lung Xia Xu Department and Eppinger [29] in other engineering disciplines. Inspired by Alexander, Andreu [2] and Lung,
SP1TFRE-SP-100 transient fuel rod evaluation code
Carpenter, David Charles
1986-01-01T23:59:59.000Z
Carpenter Compar ison of theoretical Fuel element temperatures with and without flux depression . . 63 65 IV-6 BWR/6 thermal-hydr aulic input par ametens. IV-7 BWR/6 actinide inventor y. IV-8 CRBR ther mal-hydr aulic input par ameters . . IV-9 CRBR... actinide inventory. IV-10 SP-100 ther mal-hydr aulic input parameter s. 73 76 78 82 IV-11 SP-100 actinide inventor y. A-1 Constants used for specific heat cor r elation . A-2 Constants used for ther mal expansion cour clat. ion 90 . 101 G-1...
PRESCRIBED GAUSS DECOMPOSITION FOR KAC-MOODY GROUPS OVER FIELDS.
PRESCRIBED GAUSS DECOMPOSITION FOR KAC-MOODY GROUPS OVER FIELDS. Jun Morita Institute o f and Computer Science Bar Ilan University 52900, Ramat Gan, ISRAEL Abstract. We will show the Gauss. Introduction Kac-Moody groups are equipped with canonical decompositions of di#11;erent kinds. Let us note
PRESCRIBED GAUSS DECOMPOSITION FOR KAC-MOODY GROUPS OVER FIELDS.
PRESCRIBED GAUSS DECOMPOSITION FOR KAC-MOODY GROUPS OVER FIELDS. Jun Morita Institute o f and Computer Science Bar Ilan University 52900, Ramat Gan, ISRAEL Abstract. We will show the Gauss Kac-Moody groups are equipped with canonical decompositions of Â¢Â¡Â¤Â£Â¦Â¥Â¨Â§Â©Â¥ t kinds. Let us note
Saddle point formulation for a cartoon-texture decomposition
Soatto, Stefano
Saddle point formulation for a cartoon-texture decomposition Stefan Kindermann , Stanley Osher Abstract We consider the image-decomposition into a cartoon and texture part proposed by Yves Meyer. We we consider the generalization of the ROF-functional proposed by Y. Meyer [14]. The idea is to obtain
An Energy Reference Bus Independent LMP Decomposition Algorithm
1 An Energy Reference Bus Independent LMP Decomposition Algorithm Xu Cheng, Student Member, IEEE and settlement of these financial instruments. A new energy reference bus independent LMP decomposition model and a proof are given. The new model achieves a set of reference bus independent results. An example
Using learning decomposition to analyze student fluency development
Mostow, Jack
introduces an approach called learning decomposition to analyze what types of practice are most effective TO LEARNING CURVES AND LEARNING DECOMPOSITION The goal of this paper is to investigate how different types learning curves to measure the relative impact of various types of learning events. For tracking student
Thermal Decomposition of Natural Fibers: Global Kinetic Modeling with Nonisothermal
with consideration of fiber as one pseudocomponent. Ma´lek method with activation energy values previously obtainedThermal Decomposition of Natural Fibers: Global Kinetic Modeling with Nonisothermal.interscience.wiley.com). ABSTRACT: The modeling of thermal decomposition process of ten natural fibers commonly used in polymer
Hydrogen production by the decomposition of water
Bowman, M.G.; Hollabaugh, C.M.
1981-01-13T23:59:59.000Z
How to produce hydrogen from water was a problem addressed by this invention. The solution employs a combined electrolyticalthermochemical sulfuric acid process. Additionally, high purity sulfuric acid can be produced in the process. Water and SO2 react in electrolyzer (12) so that hydrogen is produced at the cathode and sulfuric acid is produced at the anode. Then the sulfuric acid is reacted with a particular compound mrxs so as to form at least one water insoluble sulfate and at least one water insoluble oxide of molybdenum, tungsten, or boron. Water is removed by filtration; and the sulfate is decomposed in the presence of the oxide in sulfate decomposition zone (21), thus forming SO3 and reforming mrxs. The mrxs is recycled to sulfate formation zone (16). If desired, the SO3 can be decomposed to SO2 and O2; and the SO2 can be recycled to electrolyzer (12) to provide a cycle for producing hydrogen.
Thermal Decomposition of Radiation-Damaged Polystyrene
Abrefah, John; Klinger, George S.
2000-09-26T23:59:59.000Z
The radiation-damaged polystyrene (given the identification name of 'polycube') was fabricated by mixing high-density polystyrene material ("Dylene Fines # 100") with plutonium and uranium oxides. The polycubes were used in the 1960s for criticality studies during processing of spent nuclear fuel. The polycubes have since been stored for almost 40 years at the Hanford Plutonium Finishing Plant (PFP) after failure of two processes to reclaim the plutonium and uranium oxides from the polystyrene matrix. Thermal decomposition products from this highly cross-linked polystyrene matrix were characterized using Gas Chromatograph/Mass Spectroscopy (GC/MS) system coupled to a horizontal furnace. The decomposition studies were performed in air and helium atmospheres at about 773 K. The volatile and semi-volatile organic products for the radiation-damaged polystyrene were different compared to virgin polystyrene. The differences were in the number of organic species generated and their concentrations. In the inert (i.e., helium) atmosphere, the major volatile organic products identified (in order of decreasing concentrations) were styrene, benzene, toluene, ethylbenzene, xylene, nathphalene, propane, .alpha.-methylbenzene, indene and 1,2,3-trimethylbenzene. But in air, the major volatile organic species identified changed slightly. Concentrations of the organic species in the inert atmosphere were significantly higher than those for the air atmosphere processing. Overall, 38 volatile organic species were identified in the inert atmosphere compared to 49 species in air. Twenty of the 38 species in the inert conditions were also products in the air atmosphere. Twenty-two oxidized organic products were identified during thermal processing in air.
Lin, Pei-Chun
2012-01-01T23:59:59.000Z
in the geo-environment. The applied temperature profiles include uniform, constant temperature gradient oxidation of methane.16,17 Continental shield regions have a steady ther- mal structure with a geothermal
Dundas, Robert G.
that involved thrusting, that buried rocks faster than they can equilibrate with the ambient geothermal gradient, followed by ther- mal relaxation, which reestablished the ambient geo- thermal gradient in underthrust
A Fault Detection and Recovery Architecture for a Teradevice Dataflow System
Giorgi, Roberto
, ther- mal changes, or variability in the manufacturing process will further raise [30], making faults a lean recovery mechanism on thread-level. The paper is organized as follows: in Section 2 we present
Nonlocal Geometric Phase Measurements in Polarized Interferometry with Pairs of single Photons
Paris-Sud XI, Université de
the experimental observation of the nonlocal geometric phase in Hanbury Brown-Twiss polarized intensity Brown and Twiss (HB-T), who performed in- tensity interferometry experiments using incoherent ther- mal
A network-theoretic approach for decompositional translation across Open Biological Ontologies
Cimino, James J.
, gluconeogenesis (biological process term) to glucose (chemical ontology term). Identifying such decompositional
Catalytic H2O2 decomposition on palladium surfaces
Salinas, S. Adriana
1998-01-01T23:59:59.000Z
to pretrial the palladium surfaces. The rate of decomposition was found to be dependent upon the coverage and identity of the halogen adsorbate. Experimental measurements were based upon Auger electron spectroscopy (AES), low-energy electron Diffraction (LEED...
Decomposition Pathway of Ammonia Borane on the Surface of nano...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Pathway of Ammonia Borane on the Surface of nano-BN. Decomposition Pathway of Ammonia Borane on the Surface of nano-BN. Abstract: Ammonia borane (AB) is under significant...
On Decomposition of Tame Polynomials and Rational Functions
Gutierrez, Jaime
On Decomposition of Tame Polynomials and Rational Functions Jaime Gutierrez1 , David Sevilla2 1 Faculty of Sciences, University of Cantabria, Santander EÂ39071, Spain jaime.gutierrez@unican.es 2 Dpt
Autocatalytic Decomposition of Cumene Hydroperoxide at Low Temperature Conditions
Chen, Shu-Ching
depends on the self-heat rate, which is influenced by the reaction mechanism during decomposition of Electrical and Computer Engineering, University of Miami, Coral Gables, FL 33124-0640, U.S.A. Abstract Cumene
Optimization Online - An MILP-MINLP decomposition method for the ...
Irene Lotero
2015-04-14T23:59:59.000Z
Apr 14, 2015 ... An MILP-MINLP decomposition method for the global optimization of a source based model of the multiperiod ... Citation: Submitted for Publication to Computers and Chemical Engineering ... Mathematical Optimization Society.
Hydrogen production by the decomposition of water
Hollabaugh, Charles M. (Los Alamos, NM); Bowman, Melvin G. (Los Alamos, NM)
1981-01-01T23:59:59.000Z
How to produce hydrogen from water was a problem addressed by this invention. The solution employs a combined electrolytical-thermochemical sulfuric acid process. Additionally, high purity sulfuric acid can be produced in the process. Water and SO.sub.2 react in electrolyzer (12) so that hydrogen is produced at the cathode and sulfuric acid is produced at the anode. Then the sulfuric acid is reacted with a particular compound M.sub.r X.sub.s so as to form at least one water insoluble sulfate and at least one water insoluble oxide of molybdenum, tungsten, or boron. Water is removed by filtration; and the sulfate is decomposed in the presence of the oxide in sulfate decomposition zone (21), thus forming SO.sub.3 and reforming M.sub.r X.sub.s. The M.sub.r X.sub.s is recycled to sulfate formation zone (16). If desired, the SO.sub.3 can be decomposed to SO.sub.2 and O.sub.2 ; and the SO.sub.2 can be recycled to electrolyzer (12) to provide a cycle for producing hydrogen.
IN SITU INFRARED STUDY OF CATALYTIC DECOMPOSITION OF NO
KHALID ALMUSAITEER; RAM KRISHNAMURTHY; STEVEN S.C. CHUANG
1998-08-18T23:59:59.000Z
The growing concerns for the environment and increasingly stringent standards for NO emission have presented a major challenge to control NO emissions from electric utility plants and automobiles. Catalytic decomposition of NO is the most attractive approach for the control of NO emission for its simplicity. Successful development of an effective catalyst for NO decomposition will greatly decrease the equipment and operation cost of NO control. Due to lack of understanding of the mechanism of NO decomposition, efforts on the search of an effective catalyst have been unsuccessful. Scientific development of an effective catalyst requires fundamental understanding of the nature of active site, the rate-limiting step, and an approach to prolong the life of the catalyst. Research is proposed to study the reactivity of adsorbates for the direct NO decomposition and to investigate the feasibility of two novel approaches for improving catalyst activity and resistance to sintering. The first approach is the use of silanation to stabilize metal crystallites and supports for Cu-ZSM-5 and promoted Pt catalysts; the second is utilization of oxygen spillover and desorption to enhance NO decomposition activity. An innovative infrared reactor system will be used to observe and determine the dynamic behavior and the reactivity of adsorbates during NO decomposition, oxygen spillover, and silanation. A series of experiments including X-ray diffraction, temperature programmed desorption, temperature programmed reaction, X-ray photoelectron spectroscopy will be used to characterized the catalysts. The information obtained from this study will provide a scientific basis for developing an effective catalyst for the NO decomposition under practical flue gas conditions.
de la Rue du Can, Stephane
2014-01-01T23:59:59.000Z
REPORT California Energy Balance Update and DecompositionCalifornia Energy Balance Update and Decomposition Analysis2011. California Energy Balance Update and Decomposition
Algorithmic Thomas Decomposition of Algebraic and Differential Systems
Bächler, Thomas; Lange-Hegermann, Markus; Robertz, Daniel
2011-01-01T23:59:59.000Z
In this paper, we consider systems of algebraic and non-linear partial differential equations and inequations. We decompose these systems into so-called simple subsystems and thereby partition the set of solutions. For algebraic systems, simplicity means triangularity, square-freeness and non-vanishing initials. Differential simplicity extends algebraic simplicity with involutivity. We build upon the constructive ideas of J. M. Thomas and develop them into a new algorithm for disjoint decomposition. The given paper is a revised version of a previous paper and includes the proofs of correctness and termination of our decomposition algorithm. In addition, we illustrate the algorithm with further instructive examples and describe its Maple implementation together with an experimental comparison to some other triangular decomposition algorithms.
Helmholtz-Hodge Theorems: Unification of Integration and Decomposition Perspectives
Jose G. Vargas
2014-12-01T23:59:59.000Z
We develop a Helmholtz-like theorem for differential forms in Euclidean space $E_{n}$ using a uniqueness theorem similar to the one for vector fields. We then apply it to Riemannian manifolds, $R_{n}$, which, by virtue of the Schlaefli-Janet-Cartan theorem of embedding, are here considered as hypersurfaces in $E_{N}$ with $N\\geq n(n+1)/2$. We obtain a Hodge decomposition theorem that includes and goes beyond the original one, since it specifies the terms of the decomposition. We then view the same issue from a perspective of integrability of the system ($d\\alpha =\\mu ,$ $\\delta \\alpha =\
A coke oven model including thermal decomposition kinetics of tar
Munekane, Fuminori; Yamaguchi, Yukio [Mitsubishi Chemical Corp., Yokohama (Japan); Tanioka, Seiichi [Mitsubishi Chemical Corp., Sakaide (Japan)
1997-12-31T23:59:59.000Z
A new one-dimensional coke oven model has been developed for simulating the amount and the characteristics of by-products such as tar and gas as well as coke. This model consists of both heat transfer and chemical kinetics including thermal decomposition of coal and tar. The chemical kinetics constants are obtained by estimation based on the results of experiments conducted to investigate the thermal decomposition of both coal and tar. The calculation results using the new model are in good agreement with experimental ones.
Iterative image-domain decomposition for dual-energy CT
Niu, Tianye; Dong, Xue; Petrongolo, Michael; Zhu, Lei, E-mail: leizhu@gatech.edu [Nuclear and Radiological Engineering and Medical Physics Programs, The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)] [Nuclear and Radiological Engineering and Medical Physics Programs, The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)
2014-04-15T23:59:59.000Z
Purpose: Dual energy CT (DECT) imaging plays an important role in advanced imaging applications due to its capability of material decomposition. Direct decomposition via matrix inversion suffers from significant degradation of image signal-to-noise ratios, which reduces clinical values of DECT. Existing denoising algorithms achieve suboptimal performance since they suppress image noise either before or after the decomposition and do not fully explore the noise statistical properties of the decomposition process. In this work, the authors propose an iterative image-domain decomposition method for noise suppression in DECT, using the full variance-covariance matrix of the decomposed images. Methods: The proposed algorithm is formulated in the form of least-square estimation with smoothness regularization. Based on the design principles of a best linear unbiased estimator, the authors include the inverse of the estimated variance-covariance matrix of the decomposed images as the penalty weight in the least-square term. The regularization term enforces the image smoothness by calculating the square sum of neighboring pixel value differences. To retain the boundary sharpness of the decomposed images, the authors detect the edges in the CT images before decomposition. These edge pixels have small weights in the calculation of the regularization term. Distinct from the existing denoising algorithms applied on the images before or after decomposition, the method has an iterative process for noise suppression, with decomposition performed in each iteration. The authors implement the proposed algorithm using a standard conjugate gradient algorithm. The method performance is evaluated using an evaluation phantom (Catphan©600) and an anthropomorphic head phantom. The results are compared with those generated using direct matrix inversion with no noise suppression, a denoising method applied on the decomposed images, and an existing algorithm with similar formulation as the proposed method but with an edge-preserving regularization term. Results: On the Catphan phantom, the method maintains the same spatial resolution on the decomposed images as that of the CT images before decomposition (8 pairs/cm) while significantly reducing their noise standard deviation. Compared to that obtained by the direct matrix inversion, the noise standard deviation in the images decomposed by the proposed algorithm is reduced by over 98%. Without considering the noise correlation properties in the formulation, the denoising scheme degrades the spatial resolution to 6 pairs/cm for the same level of noise suppression. Compared to the edge-preserving algorithm, the method achieves better low-contrast detectability. A quantitative study is performed on the contrast-rod slice of Catphan phantom. The proposed method achieves lower electron density measurement error as compared to that by the direct matrix inversion, and significantly reduces the error variation by over 97%. On the head phantom, the method reduces the noise standard deviation of decomposed images by over 97% without blurring the sinus structures. Conclusions: The authors propose an iterative image-domain decomposition method for DECT. The method combines noise suppression and material decomposition into an iterative process and achieves both goals simultaneously. By exploring the full variance-covariance properties of the decomposed images and utilizing the edge predetection, the proposed algorithm shows superior performance on noise suppression with high image spatial resolution and low-contrast detectability.
On Partial and Generic Uniqueness of Block Term Tensor Decomposition in Signal Processing
Yang, Ming 1984-
2012-09-18T23:59:59.000Z
In this dissertation, we study the partial and generic uniqueness of block term tensor decompositions in signal processing. We present several conditions for generic uniqueness of tensor decompositions of multilinear rank (1, L1, L1), ..., (1, LR...
EFFECT OF LiCl ON THE RATE OF CALCITE DECOMPOSITION
Knutsen, Gary F.
2013-01-01T23:59:59.000Z
formed by decomposition of Caco3 and Ca(OH) 2 in vacuum, J.high co2 pressures, also for caco3 decomposition. This workLow alkali reagent grade Caco3 t of 2 to 5 ~m average
Liang, Lan
2007-04-25T23:59:59.000Z
A thermal catalytic decomposition process has been developed to recycle used tire rubber. This process enables the recovery of useful products, such as hydrocarbons and carbon blacks. During the catalytic decomposition process, the tire rubber...
Press Tonnage Signal Decomposition and Validation Analysis for
Jin, Jionghua "Judy"
Press Tonnage Signal Decomposition and Validation Analysis for Transfer or Progressive Die to de- velop a new methodology that can decompose press tonnage sig- nals to obtain individual station consists of multiple die stations, the press tonnage signals measured from the press linkages
Cardiovascular Signal Decomposition and Estimation with the Extended Kalman Smoother
Cardiovascular Signal Decomposition and Estimation with the Extended Kalman Smoother James Mc of cardiovascular signals that can be used with the extended Kalman filter or smoother to simultaneously estimate with the extended Kalman filter and smoother to estimate and track all the model parameters of interest including
Process Model Discovery: A Method Based on Transition System Decomposition
van der Aalst, Wil
Process Model Discovery: A Method Based on Transition System Decomposition Anna A. Kalenkova1 discovery algo- rithms deal with large data sets to learn automatically process models. As more event data by the unified process model. The proposed discovery algorithm is illustrated using a running example. 1
Co-evolutionary Modular Neural Networks for Automatic Problem Decomposition
Yao, Xin
-problems will be much easier than the corresponding monolithic problem. In most cases such a decomposition relies-evolutionary methods [14, 15, 16] the sub- components/modules are evolved in separate genetically isolated sub-populations and fitness evaluations for these in- dividuals are carried out by combining representative indi- viduals from
An accurate product SVD (singular value decomposition) algorithm
Bojanczyk, A.W.; Luk, F.T. (Cornell Univ., Ithaca, NY (USA). School of Electrical Engineering); Ewerbring, M. (Argonne National Lab., IL (USA)); Van Dooren, P. (Philips Research Lab., Louvain-la-Neuve (Belgium))
1990-01-01T23:59:59.000Z
In this paper, we propose a new algorithm for computing a singular value decomposition of a product of three matrices. We show that our algorithm is numerically desirable in that all relevant residual elements will be numerically small. 12 refs., 1 tab.
Kinetic modelling of the thermal decomposition of ettringite into metaettringite
Boyer, Edmond
the validity of kinetic assumptions (rate-determining step, expression of the rate as d/dt = k f() ...), a good1 Kinetic modelling of the thermal decomposition of ettringite into metaettringite J. Pourchez on nucleation and growth mechanisms of metaettringite remained. Therefore, a better understanding of the kinetic
Fast Distributed Network Decompositions and Baruch Awerbuch y
Cowen, Lenore
in the distributed network model, particularly a strong form of network decomposition known as a sparse neighborhood to the modular design of e cient network algorithms Pel93, AP90b, AP90a, AR91, BFR92]. Using this method control problems (such as shortest paths AR91], job scheduling and load balancing AKP92], broadcast
A dimensional decomposition method for stochastic fracture mechanics
Rahman, Sharif
A dimensional decomposition method for stochastic fracture mechanics Sharif Rahman * Department required by the proposed method can be viewed as performing deterministic fracture analyses at selected, no derivatives of fracture response are required by the new method developed. Results of three numerical exam
Optimal MU-MIMO precoder with MISO decomposition approach
Gesbert, David
Optimal MU-MIMO precoder with MISO decomposition approach Mustapha Amara, Yi Yuan-Wu Orange Labs considered the best existing precoder design algorithm for a MISO multiuser sys- tem proposed in [1 procedure transforming the MU-MIMO channel for each iteration into a MU-MISO channel trough virtual channel
Block Tensor Decomposition for Source Apportionment of Air Pollution
Hopke, Philip K; Li, Na; Navasca, Carmeliza
2011-01-01T23:59:59.000Z
The ambient particulate chemical composition data with three particle diameter sizes (2.5mmair sample data. In particular, we use the Block Term Decomposition (BTD) in rank-(L;L;1) form to identify nine pollution sources (Fe+Zn, Sulfur with Dust, Road Dust, two types of Metal Works, Road Salt, Local Sulfate, and Homogeneous and Cloud Sulfate).
MATROID BASE POLYTOPE DECOMPOSITION II : SEQUENCES OF HYPERPLANE SPLITS
Paris-Sud XI, Université de
(2011), 158- 172] about matroid base polytope decomposition. We will present sufficient conditions is defined as the convex hull of the incidence vectors of bases of M, that is, P(M) := conv iB ei : B a base of M , where ei is the ith standard basis vector in Rn. P(M) is a polytope of dimension at most n - 1
On decomposition and piecewise linearization in petroleum production
Foss, Bjarne A.
On decomposition and piecewise linearization in petroleum production optimization Vidar Gunnerud operations of large and complex petroleum assets is not a trivial task. There are numerous decisions- port. In petroleum assets with rate dependent gas to oil, or water to oil ratios, and with limited gas
Decomposition of Perfluorocompounds on Alumina-Based Catalyst
Kanno, Shuichi; Tamata, Shin; Kurokawa, Hideaki
2004-03-31T23:59:59.000Z
The control of the atmospheric release of PFCs (perfluorocompounds) is an important environmental problem worldwide. PFCs are powerful greenhouse gases used by the semiconductor and liquid crystal industries as etching and cleaning agents. We developed a catalyst that decomposes PFCs with only water. Al2O3 was selected from the survey of some single metal-oxide catalysts. Addition of another metal-oxide improved the decomposition ratio and durability. The Al2O3-based catalyst decomposed CF4, C2F6, C3F8, C4F8, NF3 and SF6 by more than 99% at 750 degrees Celsius. Furthermore, our catalyst retained a high decomposition ratio as demonstrated by a continuous run for about 4000 hours at 700-750 degrees Celsius. The influence of chlorine as an impurity with regard to the SF6 decomposition ratio on the catalyst was examined. SF6 was decomposed at more than 99% during 8 hours in the presence of 400 ppm chlorine. Chlorine concentration in the outlet gas was less than TLV. No chlorine compounds were found by X-ray diffraction analysis of the used catalyst. That is, the hydrogenation of chlorine did not inhibit the surface catalytic reaction for PFC. Also, CF4 was decomposed at the condition of 1.4% of high concentration. The conversion remained higher than 99% throughout during a durability test. Furthermore, we investigated a large-scale decomposition system in the paper.
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
Approximate Pyramidal Shape Decomposition Ruizhen Hu1,2
Zhang, Richard "Hao"
shapes are optimal for molding, casting, and layered 3D printing. However, many common objects, resulting in significant saving in time and material when 3D printed via layered fabrication. be visible motivated our study of pyramidality is 3D printing via Fusion Decomposition Modeling (FDM). FDM is one
Approximate Pyramidal Shape Decomposition Ruizhen Hu1,2
Zhang, Richard "Hao"
shapes are optimal for molding, casting, and layered 3D printing. However, many common objects in time and material when 3D printed via layered fabrication. pyramidal shape S has a designated motivated our study of pyramidality is 3D printing via Fusion Decomposition Modeling (FDM). FDM is one
Hepp and Speer Sectors within Modern Strategies of Sector Decomposition
A. V. Smirnov; V. A. Smirnov
2008-12-26T23:59:59.000Z
Hepp and Speer sectors were successfully used in the sixties and seventies for proving mathematical theorems on analytically or/and dimensionally regularized and renormalized Feynman integrals at Euclidean external momenta. We describe them within recently developed strategies of introducing iterative sector decompositions. We show that Speer sectors are reproduced within one of the existing strategies.
Roaming radical pathways for the decomposition of alkanes.
Harding, L. B.; Klippenstein, S. J. (Chemical Sciences and Engineering Division)
2010-01-01T23:59:59.000Z
CASPT2 calculations predict the existence of roaming radical pathways for the decomposition of propane, n-butane, isobutane and neopentane. The roaming radical paths lead to the formation of an alkane and an alkene instead of the expected radical products. The predicted barriers for the roaming radical paths lie {approx}1 kcal/mol below the corresponding radical asymptotes.
Optical ranked-order filtering using threshold decomposition
Allebach, J.P.; Ochoa, E.; Sweeney, D.W.
1987-10-09T23:59:59.000Z
A hybrid optical/electronic system performs median filtering and related ranked-order operations using threshold decomposition to encode the image. Threshold decomposition transforms the nonlinear neighborhood ranking operation into a linear space-invariant filtering step followed by a point-to-point threshold comparison step. Spatial multiplexing allows parallel processing of all the threshold components as well as recombination by a second linear, space-invariant filtering step. An incoherent optical correlation system performs the linear filtering, using a magneto-optic spatial light modulator as the input device and a computer-generated hologram in the filter plane. Thresholding is done electronically. By adjusting the value of the threshold, the same architecture is used to perform median, minimum, and maximum filtering of images. A totally optical system is also disclosed. 3 figs.
Optical ranked-order filtering using threshold decomposition
Allebach, Jan P. (West Lafayette, IN); Ochoa, Ellen (Pleasanton, CA); Sweeney, Donald W. (Alamo, CA)
1990-01-01T23:59:59.000Z
A hybrid optical/electronic system performs median filtering and related ranked-order operations using threshold decomposition to encode the image. Threshold decomposition transforms the nonlinear neighborhood ranking operation into a linear space-invariant filtering step followed by a point-to-point threshold comparison step. Spatial multiplexing allows parallel processing of all the threshold components as well as recombination by a second linear, space-invariant filtering step. An incoherent optical correlation system performs the linear filtering, using a magneto-optic spatial light modulator as the input device and a computer-generated hologram in the filter plane. Thresholding is done electronically. By adjusting the value of the threshold, the same architecture is used to perform median, minimum, and maximum filtering of images. A totally optical system is also disclosed.
A TFETI Domain Decomposition Solver for Elastoplastic Problems
?ermák, M; Sysala, S; Valdman, J
2012-01-01T23:59:59.000Z
In the paper, we propose an algorithm for the efficient parallel implementation of elastoplastic problems with hardening based on the so-called TFETI (Total Finite Element Tearing and Interconnecting) domain decomposition method. We consider an associated elastoplastic model with the von Mises plastic criterion and the linear isotropic hardening law. Such a model is discretized by the implicit Euler method in time and the consequent one time step elastoplastic problem by the finite element method in space. The latter results in a system of nonlinear equations with a strongly semismooth and strongly monotone operator. The semismooth Newton method is applied to solve this nonlinear system. Corresponding linearized problems arising in the Newton iterations are solved in parallel by the above mentioned TFETI domain decomposition method. The proposed TFETI based algorithm was implemented in Matlab parallel environment and its performance was illustrated on a 3D elastoplastic benchmark. Numerical results for differ...
A decomposition approach to the economic dispatch of hydrothermal systems
Pereira, M.U.F.; Pinto, L.M.
1982-10-01T23:59:59.000Z
The objective of the predispatch of a hydroelectric system is to produce an hourly generation schedule that does not violate electrical constraints and meets weekly generation targets for each hydro plant. The predispatch can therefore be seen as a link between operation planning and the on-line generation scheduling. This paper presents a decomposition approach to the solution of the predispatch problem, which is modeled as a large-scale linear program and solved by Dantzig-Wolfe decomposition. The subproblems in this decompositon correspond to hourly optimal rescheduling problems and are solved by an efficient version of the Dual Simplex method. Core and CPU requirements are thus greatly reduced. A case study with the Brazilian Southeast network is presented and discussed.
Multipole decomposition of potentials in relativistic heavy ion collisions
A. Isar
2006-04-13T23:59:59.000Z
In relativistic heavy ion collisions an exact multipole decomposition of the Lorentz transformed time dependent Coulomb potentials in a coordinate system with equal constant, but opposite velocities of the ions, is obtained for both zero and different from zero impact parameter. The case of large values of $\\gamma$ and the gauge transformation of the interaction removing both the $\\gamma$ dependence and the $\\ln b$ dependence are also considered.
The exocenter and type decomposition of a generalized pseudoeffect algebra
David J. Foulis; Sylvia Pulmannova; Elena Vincekova
2012-07-12T23:59:59.000Z
We extend to a generalized pseudoeffect algebra (GPEA) the notion of the exocenter of a generalized effect algebra (GEA) and show that elements of the exocenter are in one-to-one correspondence with direct decompositions of the GPEA; thus the exocenter is a generalization of the center of a pseudoeffect algebra (PEA). The exocenter forms a boolean algebra and the central elements of the GPEA correspond to elements of a sublattice of the exocenter which forms a generalized boolean algebra. We extend to GPEAs the notion of central orthocompleteness, prove that the exocenter of a centrally orthocomplete GPEA (COGPEA) is a complete boolean algebra and show that the sublattice corresponding to the center is a complete boolean subalgebra. We also show that in a COGPEA, every element admits an exocentral cover and that the family of all exocentral covers, the so-called exocentral cover system, has the properties of a hull system on a generalized effect algebra. We extend the notion of type determining (TD) sets, originally introduced for effect algebras and then extended to GEAs and PEAs, to GPEAs, and prove a type-decomposition theorem, analogous to the type decomposition of von Neumann algebras.
Volume Decomposition and Feature Recognition for Hexahedral Mesh Generation
GADH,RAJIT; LU,YONG; TAUTGES,TIMOTHY J.
1999-09-27T23:59:59.000Z
Considerable progress has been made on automatic hexahedral mesh generation in recent years. Several automatic meshing algorithms have proven to be very reliable on certain classes of geometry. While it is always worth pursuing general algorithms viable on more general geometry, a combination of the well-established algorithms is ready to take on classes of complicated geometry. By partitioning the entire geometry into meshable pieces matched with appropriate meshing algorithm the original geometry becomes meshable and may achieve better mesh quality. Each meshable portion is recognized as a meshing feature. This paper, which is a part of the feature based meshing methodology, presents the work on shape recognition and volume decomposition to automatically decompose a CAD model into meshable volumes. There are four phases in this approach: (1) Feature Determination to extinct decomposition features, (2) Cutting Surfaces Generation to form the ''tailored'' cutting surfaces, (3) Body Decomposition to get the imprinted volumes; and (4) Meshing Algorithm Assignment to match volumes decomposed with appropriate meshing algorithms. The feature determination procedure is based on the CLoop feature recognition algorithm that is extended to be more general. Results are demonstrated over several parts with complicated topology and geometry.
Evaluation of microporous carbon filters as catalysts for ozone decomposition
Whinnery, L.; Coutts, D.; Shen, C.; Adams, R. [Sandia National Labs., Livermore, CA (United States); Quintana, C.; Showalter, S. [Sandia National Labs., Albuquerque, NM (United States)
1994-12-31T23:59:59.000Z
Ozone is produced in small quantities in photocopiers and laser printers in the workplace and large quantities in industrial waste water treatment facilities. Carbon filters are commonly used to decompose this unwanted ozone. The three most important factors in producing a filter for this purpose are flow properties, efficiency, and cost. Most ozone decomposition applications require very low back-pressure at modest flow rates. The tradeoff between the number of pores and the size of the pores will be discussed. Typical unfiltered emissions in the workplace are approximately 1 ppm. The maximum permissible exposure limit, PEL, for worker exposure to ozone is 0.1 ppm over 8 hours. Several methods have been examined to increase the efficiency of ozone decomposition. Carbon surfaces were modified with catalysts, the surface activated, and the surface area was increased, in attempts to decompose ozone more effectively. Methods to reduce both the processing and raw material costs were investigated. Several sources of microporous carbon were investigated as ozone decomposition catalysts. Cheaper processing routes including macropore templating, faster drying and extracting methods were also studied.
Development of a Novel Catalyst for No Decomposition
Ates Akyurtlu; Jale Akyurtlu
2007-06-22T23:59:59.000Z
Air pollution arising from the emission of nitrogen oxides as a result of combustion taking place in boilers, furnaces and engines, has increasingly been recognized as a problem. New methods to remove NO{sub x} emissions significantly and economically must be developed. The current technology for post-combustion removal of NO is the selective catalytic reduction (SCR) of NO by ammonia or possibly by a hydrocarbon such as methane. The catalytic decomposition of NO to give N{sub 2} will be preferable to the SCR process because it will eliminate the costs and operating problems associated with the use of an external reducing species. The most promising decomposition catalysts are transition metal (especially copper)-exchanged zeolites, perovskites, and noble metals supported on metal oxides such as alumina, silica, and ceria. The main shortcoming of the noble metal reducible oxide (NMRO) catalysts is that they are prone to deactivation by oxygen. It has been reported that catalysts containing tin oxide show oxygen adsorption behavior that may involve hydroxyl groups attached to the tin oxide. This is different than that observed with other noble metal-metal oxide combinations, which have the oxygen adsorbing on the noble metal and subsequently spilling over to the metal oxide. This observation leads one to believe that the Pt/SnO{sub 2} catalysts may have a potential as NO decomposition catalysts in the presence of oxygen. This prediction is also supported by some preliminary data obtained for NO decomposition on a Pt/SnO{sub 2} catalyst in the PI's laboratory. The main objective of the research that is being undertaken is the evaluation of the Pt/SnO{sub 2} catalysts for the decomposition of NO in simulated power plant stack gases with particular attention to the resistance to deactivation by O{sub 2}, H{sub 2}O, and elevated temperatures. Temperature programmed desorption (TPD) and temperature programmed reaction (TPRx) studies on Pt/SnO{sub 2} catalysts having different noble metal concentrations and pretreated under different conditions were done. It is also planned to perform NO decomposition tests in a laboratory-size packed-bed reactor to obtain long-term deactivation data. Temperature programmed desorption and temperature controlled reaction runs were made with catalysts containing 15% Pt and 10% Pt on SnO{sub 2}. Catalysts containing 10% Pt resulted in significantly lower activities than 15% PT catalysts. Therefore, in the remainder of the tests 15% Pt/SnO{sub 2} catalysts were used. Isothermal reaction studies were made to elucidate the effects of temperature, oxygen, water vapor, pretreatment temperature, and space velocity on NO dissociation. It was found that the presence of oxygen and water vapor did not affect the activation energy of the NO dissociation reaction indicating the presence of the same rate controlling step for all feed compositions. Activation energy was higher for higher gas velocities suggesting the presence of mass transfer limitations at lower velocities. Presence of oxygen in the feed inhibited the NO decomposition. Having water vapor in the feed did not significantly affect the catalyst activity for catalysts pretreated at 373 K, but significantly reduced catalyst activity for catalysts pretreated at 900 K. Long-term deactivation studies indicated that the catalyst deactivated slowly both with and without the presence of added oxygen in the feed, Deactivation started later in the presence of oxygen. The activities of the catalysts investigated were too low below 1000 K for commercial applications. Their selectivity towards N{sub 2} was good at temperatures above 700 K. A different method for catalyst preparation is needed to improve the catalyst performance.
The Static Quark Potential from the Gauge Independent Abelian Decomposition
Nigel Cundy; Y. M. Cho; Weonjong Lee
2015-03-24T23:59:59.000Z
We investigate the relationship between colour confinement and the gauge independent Cho-Duan-Ge Abelian decomposition. The decomposition is defined in terms of a colour field $n$; the principle novelty of our study is that we have defined this field in terms of the eigenvectors of the Wilson Loop. This establishes an equivalence between the path ordered integral of the non-Abelian gauge fields with an integral over an Abelian restricted gauge field which is tractable both theoretically and numerically in lattice QCD. We circumvent path ordering without needing an additional path integral. By using Stokes' theorem, we can compute the Wilson Loop in terms of a surface integral over a restricted field strength, and show that the restricted field strength may be dominated by certain structures, which occur when one of the quantities parametrising the colour field $n$ winds itself around a non-analyticity in the colour field. If they exist, these structures will lead to a area law scaling for the Wilson Loop and provide a mechanism for quark confinement. We search for these structures in quenched lattice QCD. We perform the Abelian decomposition, and compare the electric and magnetic fields with the patterns expected theoretically. We find that the restricted field strength is dominated by objects which may be peaks a single lattice spacing in size or extended string-like lines of electromagnetic flux. The objects are not isolated monopoles, as they generate electric fields in addition to magnetic fields, and the fields are not spherically symmetric, but may be either caused by a monopole/anti-monopole condensate, some other types of topological objects or a combination of these. Removing these peaks removes the area law scaling of the string tension, suggesting that they are responsible for confinement.
Decomposition of cumyl hydroperoxide in the presence of sulphonated silica in a flow-type system
Shelpakova, N.A.; Ioffa, A.F.
1993-12-31T23:59:59.000Z
An investigation has been made of the decomposition of cumyl hydroperoxide (CHP) in the presence of silica-based sulphocationites in a flow-type system. It was established that the given specimens are effective catalysts for the decomposition of CHP into phenol and acetone. It was shown that, in the course of the process, no irreversible poisoning of the surface of the catalyst by the products of CHP decomposition occurs. Data of chromatographic analysis of the products of CHP decomposition in the presence of sulphuric acid and silica-based sulphocationites are given.
Signal evaluations using singular value decomposition for Thomson scattering diagnostics
Tojo, H., E-mail: tojo.hiroshi@jaea.go.jp; Yatsuka, E.; Hatae, T.; Itami, K. [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0193 (Japan); Yamada, I.; Yasuhara, R.; Funaba, H.; Hayashi, H. [National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292 (Japan)
2014-11-15T23:59:59.000Z
This paper provides a novel method for evaluating signal intensities in incoherent Thomson scattering diagnostics. A double-pass Thomson scattering system, where a laser passes through the plasma twice, generates two scattering pulses from the plasma. Evaluations of the signal intensities in the spectrometer are sometimes difficult due to noise and stray light. We apply the singular value decomposition method to Thomson scattering data with strong noise components. Results show that the average accuracy of the measured electron temperature (T{sub e}) is superior to that of temperature obtained using a low-pass filter (<20 MHz) or without any filters.
Gallego Arrubla, Julian Andres
2013-07-25T23:59:59.000Z
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 viii LIST OF FIGURES FIGURE Page 3.1 System of inequalities U . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.2 Systems of inequalities B and C . . . . . . . . . . . . . . . . . . . . 26 3.3 Compass search tree of system B..., and T (~!) T is deterministic. B. T (~!) and r(~!) are random. C. X Rn1 . I. X Zn2 . N. X Bn2 . M. X Rn1 Zn2 or X Rn1 Bn2 . Most of the approaches found in the literature attempt to solve SIP-C1 for the 1RC case. This work develops an IIS decomposition method...
Energy decomposition within Einstein-Born-Infeld black holes
Jonas P. Pereira; Jorge A. Rueda
2015-03-09T23:59:59.000Z
We analyze the consequences of the recently found generalization of the Christodoulou-Ruffini black hole mass decomposition for Einstein-Born-Infeld black holes [characterized by the parameters $(Q,M,b)$, where $M = M(M_{irr},Q,b)$, $b$ scale field, $Q$ charge, $M_{irr}$ "irreducible mass", physically meaning the energy of a black hole when its charge is null] and their interactions. We show in this context that their description is largely simplified and can basically be split into two families depending upon the parameter $b|Q|$. If $b|Q|\\leq 1/2$, then black holes could have even zero irreducible masses and they always exhibit single, non degenerated, horizons. If $b|Q|>1/2$, then an associated black hole must have a minimum irreducible mass (related to its minimum energy) and has two horizons up to a transitional irreducible mass. For larger irreducible masses, single horizon structures raise again. By assuming that black holes emit thermal uncharged scalar particles, we further show in light of the black hole mass decomposition that one satisfying $b|Q|>1/2$ takes an infinite amount of time to reach the zero temperature, settling down exactly at its minimum energy. Finally, we argue that depending on the fundamental parameter $b$, the radiation (electromagnetic and gravitational) coming from Einstein-Born-Infeld black holes could differ significantly from Einstein-Maxwell ones. Hence, it could be used to assess such a parameter.
Cho decomposition of electrically charged one-half monopole
Ng, Ban-Loong; Teh, Rosy; Wong, Khai-Ming [School of Physics, Universiti Sains Malaysia, 11800 USM Penang (Malaysia)
2014-03-05T23:59:59.000Z
Recently we have carried out some work on the Cho decomposition of the electrically neutral, finite energy one-half monopole solution of the SU(2) Yang-Mills-Higgs field theory. In this paper, we performed the decomposition of the electrically charged solution using the same numerical procedure. The gauge potential of the one-half dyon solution is decomposed into Abelian and non-Abelian components. The semi-infinite string singularity in the gauge potential is a contribution of the Higgs field and hence topological in nature. The string singularity cannot be cancelled by the non-Abelian components of the gauge potential. However, the string singularity is integrable and the energy of the solution is finite. By decomposing the magnetic fields and covariant derivatives of the Higgs field into three isospin space directions, we are able to provide conclusive evidence that the constructed one-half dyon is certainly a non-BPS solution even in the limit of vanishing Higgs self-coupling constant and electric charge. Furthermore, we found that the time component of gauge function is parallel to the Higgs field in isospace only at large distances, elsewhere they are non-parallel.
de la Rue du Can, Stephane
2014-01-01T23:59:59.000Z
Energy Balance Update and Decomposition Analysis for the Industry and Building SectorsEnergy Balance Update and Decomposition Analysis for the Industry and Building SectorsEnergy Balance Update and Decomposition Analysis for the Industry and Building Sectors.
FOURTH-ORDER CONFAC DECOMPOSITION APPROACH FOR BLIND IDENTIFICATION OF UNDERDETERMINED MIXTURES
Paris-Sud XI, Université de
FOURTH-ORDER CONFAC DECOMPOSITION APPROACH FOR BLIND IDENTIFICATION OF UNDERDETERMINED MIXTURES to the case of third-order derivatives by resorting to a fourth-order CONFAC decomposition. We show how different third-order derivative types can be combined into a single fourth-order CONFAC tensor model
On the use of proper orthogonal decomposition to describe inflow turbulence and wind turbine loads
Manuel, Lance
On the use of proper orthogonal decomposition to describe inflow turbulence and wind turbine loads, USA Keywords: Proper Orthogonal Decomposition, inflow turbulence, wind turbine ABSTRACT: We discuss experienced by a wind turbine. A methodology is proposed that employs low- dimensional POD models
Circular Harmonic Decomposition Approach for Numerical Inversion of Circular Radon Transforms
Louis, Alfred K.
Circular Harmonic Decomposition Approach for Numerical Inversion of Circular Radon Transforms Gaël@num.uni-sb.de ABSTRACT Numerical inversions via circular harmonic decomposition for two classes of circular Radon transforms are established. The first class deals with the Radon transform (RT) de- fined on circular arcs
Reduction of Model Order Based on Proper Orthogonal Decomposition for Lithium-Ion Battery decomposition POD for a physics-based lithium-ion battery model. The methodology to obtain the proper orthogonal modes and to analyze their optimality is included. The POD-based ROM for a lithium-ion battery is used
Integration of Refinery Planning and Crude-Oil Scheduling using Lagrangian Decomposition
Grossmann, Ignacio E.
program (MINLP) integrating the two main optimization problems appearing in the oil refining industry scheduling, mixed-integer nonlinear programming, Lagrangian decomposition 1. Introduction The oil refiningIntegration of Refinery Planning and Crude-Oil Scheduling using Lagrangian Decomposition Sylvain
Operator-Schmidt decomposition and the geometrical edges of two-qubit gates
S. Balakrishnan; R. Sankaranarayanan
2011-06-30T23:59:59.000Z
Nonlocal two-qubit quantum gates are represented by canonical decomposition or equivalently by operator-Schmidt decomposition. The former decomposition results in geometrical representation such that all the two-qubit gates form tetrahedron within which perfect entanglers form a polyhedron. On the other hand, it is known from the later decomposition that Schmidt number of nonlocal gates can be either 2 or 4. In this work, some aspects of later decomposition are investigated. It is shown that two gates differing by local operations possess same set of Schmidt coefficients. Employing geometrical method, it is established that Schmidt number 2 corresponds to controlled unitary gates. Further, all the edges of tetrahedron and polyhedron are characterized using Schmidt strength, a measure of operator entanglement. It is found that one edge of the tetrahedron possesses the maximum Schmidt strength, implying that all the gates in the edge are maximally entangled.
Operator-Schmidt decomposition and the geometrical edges of two-qubit gates
Balakrishnan, S
2010-01-01T23:59:59.000Z
Nonlocal two-qubit quantum gates are represented by canonical decomposition or equivalently by operator-Schmidt decomposition. The former decomposition results in geometrical representation such that all the two-qubit gates form tetrahedron within which perfect entanglers form a polyhedron. On the other hand, it is known from the later decomposition that Schmidt number of nonlocal gates can be either 2 or 4. In this work, some aspects of later decomposition are investigated. It is shown that two gates differing by local operations possess same set of Schmidt coefficients. Employing geometrical method, it is established that Schmidt number 2 corresponds to controlled unitary gates. Further, all the edges of tetrahedron and polyhedron are characterized using Schmidt strength, a measure of operator entanglement. It is found that one edge of the tetrahedron possesses the maximum Schmidt strength, implying that all the gates in the edge are maximally entangled.
Estimating the solar meridional circulation by normal mode decomposition
Lars Krieger; Markus Roth; Oskar von der Luehe
2008-11-05T23:59:59.000Z
The objective of this article is to use Fourier-Hankel decomposition as suggested earlier by Braun & Fan (1998) to estimate the integrated horizontal meridional flow velocity as a function of mode penetration depth, and to find ways of potentially improve this technique. We use a time series of 43200 (30 days) consecutive full-disk Dopplergrams obtained by the MDI (Michelson Doppler Imager) instrument aboard the SOHO (Solar Heliospheric Observatory) spacecraft in April 1999. We find averaged meridional flow estimates of 15 m/s for modes with a penetration depth in the upper 20 Mm of the solar convection zone. This reproduces the results of the earlier investigations. Moreover we conclude that this method has the potential to become a new technique to measure the meridional circulation in the deep convection zone, if some improvements will be applied.
Object detection with a multistatic array using singular value decomposition
Hallquist, Aaron T.; Chambers, David H.
2014-07-01T23:59:59.000Z
A method and system for detecting the presence of subsurface objects within a medium is provided. In some embodiments, the detection system operates in a multistatic mode to collect radar return signals generated by an array of transceiver antenna pairs that is positioned across a surface and that travels down the surface. The detection system converts the return signals from a time domain to a frequency domain, resulting in frequency return signals. The detection system then performs a singular value decomposition for each frequency to identify singular values for each frequency. The detection system then detects the presence of a subsurface object based on a comparison of the identified singular values to expected singular values when no subsurface object is present.
Stochastic domain decomposition for time dependent adaptive mesh generation
Bihlo, Alexander; Walsh, Emily J
2015-01-01T23:59:59.000Z
The efficient generation of meshes is an important component in the numerical solution of problems in physics and engineering. Of interest are situations where global mesh quality and a tight coupling to the solution of the physical partial differential equation (PDE) is important. We consider parabolic PDE mesh generation and present a method for the construction of adaptive meshes in two spatial dimensions using stochastic domain decomposition that is suitable for an implementation in a multi- or many-core environment. Methods for mesh generation on periodic domains are also provided. The mesh generator is coupled to a time dependent physical PDE and the system is evolved using an alternating solution procedure. The method uses the stochastic representation of the exact solution of a parabolic linear mesh generator to find the location of an adaptive mesh along the (artificial) subdomain interfaces. The deterministic evaluation of the mesh over each subdomain can then be obtained completely independently us...
Non-equilibrium Theory of Arrested Spinodal Decomposition
José Manuel Olais-Govea; Leticia López-Flores; Magdaleno Medina-Noyola
2015-05-03T23:59:59.000Z
The Non-equilibrium Self-consistent Generalized Langevin Equation theory of irreversible relax- ation [Phys. Rev. E (2010) 82, 061503; ibid. 061504] is applied to the description of the non- equilibrium processes involved in the spinodal decomposition of suddenly and deeply quenched simple liquids. For model liquids with hard-sphere plus attractive (Yukawa or square well) pair potential, the theory predicts that the spinodal curve, besides being the threshold of the thermo- dynamic stability of homogeneous states, is also the borderline between the regions of ergodic and non-ergodic homogeneous states. It also predicts that the high-density liquid-glass transition line, whose high-temperature limit corresponds to the well-known hard-sphere glass transition, intersects the spinodal curve at lower temperatures and densities, and continues inside the spinodal region as a glass-glass transition line. Within the region bounded from below by this low-temperature glass-glass transition and from above by the spinodal dynamic arrest line we can recognize two distinct domains with qualitatively different temperature dependence of the localization length. In the shallow-quench domain the localization length diverges as a power law as the tempera- ture T approaches the spinodal temperature Ts, whereas in the deep-quench domain, immediately above the glass-glass line, the localization length increases exponentially with T. We conjecture that the upper domain might correspond to full gas-liquid phase separation conditions, whereas the deep-quench domain might correspond to the formation of physical gels by arrested spinodal decomposition.
Kusiak, Andrew
Decomposition in Data Mining: An Industrial Case Study Andrew Kusiak, Member, IEEE Abstract--Data mining offers for mining. In this paper, numerous methods for decomposition of data sets are discussed. Decomposition enhances the quality of knowledge extracted from large databases by simplification of the data mining task
Title: Wood decomposition rates and functional types in a shifting climate. Principal Investigator, focused on decomposition of black spruce wood, would complement the SPRUCE decomposition trial (Kolka PI and an approach that can be mirrored in a small-diameter wood decay study and can allow us to leverage sampling
Alternative Decomposition of Two-Qutrit Pure States and Its Relation with Entanglement Invariants
Rui-Juan Gu; Fu-Lin Zhang; Shao-Ming Fei; Jing-Ling Chen
2011-11-03T23:59:59.000Z
Based on maximally entangled states in the full- and sub-spaces of two qutrits, we present an alternative decomposition of two-qutrit pure states in a form $|\\Psi>=\\frac{p_{1}}{\\sqrt{3}}(|00>+|11>+|22>) +\\frac{p_{2}}{\\sqrt{2}}(|01>+|12>)+ p_{3}e^{i\\theta}|02>$. Similar to the Schmidt decomposition, all two-qutrit pure states can be transformed into the alternative decomposition under local unitary transformations, and the parameter $p_1$ is shown to be an entanglement invariant.
Singular value decomposition utilizing parallel algorithms on graphical processors
Kotas, Charlotte W [ORNL; Barhen, Jacob [ORNL
2011-01-01T23:59:59.000Z
One of the current challenges in underwater acoustic array signal processing is the detection of quiet targets in the presence of noise. In order to enable robust detection, one of the key processing steps requires data and replica whitening. This, in turn, involves the eigen-decomposition of the sample spectral matrix, Cx = 1/K xKX(k)XH(k) where X(k) denotes a single frequency snapshot with an element for each element of the array. By employing the singular value decomposition (SVD) method, the eigenvectors and eigenvalues can be determined directly from the data without computing the sample covariance matrix, reducing the computational requirements for a given level of accuracy (van Trees, Optimum Array Processing). (Recall that the SVD of a complex matrix A involves determining V, , and U such that A = U VH where U and V are orthonormal and is a positive, real, diagonal matrix containing the singular values of A. U and V are the eigenvectors of AAH and AHA, respectively, while the singular values are the square roots of the eigenvalues of AAH.) Because it is desirable to be able to compute these quantities in real time, an efficient technique for computing the SVD is vital. In addition, emerging multicore processors like graphical processing units (GPUs) are bringing parallel processing capabilities to an ever increasing number of users. Since the computational tasks involved in array signal processing are well suited for parallelization, it is expected that these computations will be implemented using GPUs as soon as users have the necessary computational tools available to them. Thus, it is important to have an SVD algorithm that is suitable for these processors. This work explores the effectiveness of two different parallel SVD implementations on an NVIDIA Tesla C2050 GPU (14 multiprocessors, 32 cores per multiprocessor, 1.15 GHz clock - peed). The first algorithm is based on a two-step algorithm which bidiagonalizes the matrix using Householder transformations, and then diagonalizes the intermediate bidiagonal matrix through implicit QR shifts. This is similar to that implemented for real matrices by Lahabar and Narayanan ("Singular Value Decomposition on GPU using CUDA", IEEE International Parallel Distributed Processing Symposium 2009). The implementation is done in a hybrid manner, with the bidiagonalization stage done using the GPU while the diagonalization stage is done using the CPU, with the GPU used to update the U and V matrices. The second algorithm is based on a one-sided Jacobi scheme utilizing a sequence of pair-wise column orthogonalizations such that A is replaced by AV until the resulting matrix is sufficiently orthogonal (that is, equal to U ). V is obtained from the sequence of orthogonalizations, while can be found from the square root of the diagonal elements of AH A and, once is known, U can be found from column scaling the resulting matrix. These implementations utilize CUDA Fortran and NVIDIA's CUB LAS library. The primary goal of this study is to quantify the comparative performance of these two techniques against themselves and other standard implementations (for example, MATLAB). Considering that there is significant overhead associated with transferring data to the GPU and with synchronization between the GPU and the host CPU, it is also important to understand when it is worthwhile to use the GPU in terms of the matrix size and number of concurrent SVDs to be calculated.
Sanov, Andrei
Photoinitiated decomposition of HNCO near the H NCO threshold: Centrifugal barriers and channel. These constraints are associated with long range 47 Å centrifugal barriers, which are significant even near
Armagan, Emre
2009-01-01T23:59:59.000Z
In this thesis, a Benders decomposition algorithm is designed and implemented to solve both deterministic and stochastic pooling problems to global optimality. Convergence of the algorithm to a global optimum is proved and ...
Kammen, Daniel M.
1 Globalization, Economic Reform, and Structural Price Transmission: SAM Decomposition Techniques those which have been slow to reform systems of administered prices. Such allocation mechanisms now undermine reform and structural adjustments efforts in this important emerging Asian economy. Key words
Image Cartoon-Texture Decomposition and Feature Selection Using the Total Variation Regularized L1
Yin, Wotao
Functional Wotao Yin1 , Donald Goldfarb1 , and Stanley Osher2 1 Department of Industrial Engineering-based cartoon-texture decomposition models, Meyer [15] and Haddad & Meyer [12] proposed to use the G-norm, Vese
Decomposition of Images by the Anisotropic Rudin-Osher-Fatemi Model
Soatto, Stefano
Decomposition of Images by the Anisotropic Rudin-Osher-Fatemi Model Stanley J. Osher and Selim. Meyer shows in [3] for minimizers of (1). From an applied point of view, our main results
Image Cartoon-Texture Decomposition and Feature Selection using the Total Variation Regularized L1
Soatto, Stefano
Functional Wotao Yin1 , Donald Goldfarb1 , and Stanley Osher2 1 Department of Industrial Engineering-based cartoon-texture decomposition models, Meyer [13] and Haddad & Meyer [10] proposed to use the G-norm, Vese
Easwaran, Gopalakrishnan
2010-01-16T23:59:59.000Z
on decomposition techniques, heuristics, and meta-heuristic approaches to seek a solution that characterizes the configuration of the CLSC network, along with the coordinated forward and reverse flows....
the decomposition of GeH4.[11] The fragmentation of 1 via
Gleason, Karen K.
the decisive step.[12] The difference between the decomposition mechanisms of organosilanes and organogermanes in a stainless steel reactor (Fig. 4), evac- uated by a drag pump. The substrate is mounted on a resistive heater
Multi-layered Decomposition of Recurrent David Russell and Shaogang Gong
Gong, Shaogang
Multi-layered Decomposition of Recurrent Scenes David Russell and Shaogang Gong Department' to the temporal domain such that the presence #12;2 D. Russell and S. Gong of an object is treated explicitly
Spectral Decomposition Using S-transform for Hydrocarbon Detection and Filtering
Zhang, Zhao
2012-10-19T23:59:59.000Z
Spectral decomposition is a modern tool that utilizes seismic data to generate additional useful information in seismic exploration for hydrocarbon detection, lithology identification, stratigraphic interpretation, filtering and others. Different...
Ionization-Enhanced Decomposition of 2,4,6-Trinitrotoluene (TNT) Molecules
Wang, Bin [Vanderbilt University; Wright, David [Vanderbilt University; Cliffel, David [Vanderbilt University; HaglundJr., Richard F [Vanderbilt University; Pantelides, Sokrates T. [Vanderbilt University
2011-01-01T23:59:59.000Z
The unimolecular decomposition reaction of TNT can in principle be used to design ways to either detect or remove TNT from the environment. Here, we report the results of a density functional theory study of possible ways to lower the reaction barrier for this decomposition process by ionization, so that decomposition and/or detection can occur at room temperature. We find that ionizing TNT lowers the reaction barrier for the initial step of this decomposition. We further show that a similar effect can occur if a positive moiety is bound to the TNT molecule. The positive charge produces a pronounced electron redistribution and dipole formation in TNT with minimal charge transfer from TNT to the positive moiety.
Diagonal and Low-Rank Matrix Decompositions, Correlation Matrices, and Ellipsoid Fitting
Saunderson, James F.
In this paper we establish links between, and new results for, three problems that are not usually considered together. The first is a matrix decomposition problem that arises in areas such as statistical modeling and ...
Software Architecture Decomposition Using Attributes Chung-Horng Lung, Xia Xu Marzia Zaman
Lung, Chung-Horng
Software Architecture Decomposition Using Attributes Chung-Horng Lung, Xia Xu Marzia Zaman in the life cycle. Inspired by Alexander, Andreu, et al. [3] and Lung, et al. [15] presented applications
Schwaenen, Markus
2012-07-16T23:59:59.000Z
techniques. As an example for the latter, a temporal highly resolved data set from wall pressure measurements of a transonic compressor stage is analyzed using proper orthogonal decomposition. The underlying experiments were performed by collaborators...
METALLICITY-DEPENDENT GALACTIC ISOTOPIC DECOMPOSITION FOR NUCLEOSYNTHESIS
West, Christopher; Heger, Alexander, E-mail: west0482@umn.edu, E-mail: alexander.heger@monash.edu [Minnesota Institute for Astrophysics, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 (United States)
2013-09-01T23:59:59.000Z
All stellar evolution models for nucleosynthesis require an initial isotopic abundance set to use as a starting point. Generally, our knowledge of isotopic abundances of stars is fairly incomplete except for the Sun. We present a first model for a complete average isotopic decomposition as a function of metallicity. Our model is based on the underlying nuclear astrophysics processes, and is fitted to observational data, rather than traditional forward galactic chemical evolution modeling which integrates stellar yields beginning from big bang nucleosynthesis. We first decompose the isotopic solar abundance pattern into contributions from astrophysical sources. Each contribution is then assumed to scale as a function of metallicity. The resulting total isotopic abundances are summed into elemental abundances and fitted to available halo and disk stellar data to constrain the model's free parameter values. This procedure allows us to use available elemental observational data to reconstruct and constrain both the much needed complete isotopic evolution that is not accessible to current observations, and the underlying astrophysical processes. As an example, our model finds a best fit for Type Ia contributing {approx_equal} 0.7 to the solar Fe abundance, and Type Ia onset occurring at [Fe/H] {approx_equal} -1.1, in agreement with typical values.
Systematic decomposition of the neutrinoless double beta decay operator
Florian Bonnet; Martin Hirsch; Toshihiko Ota; Walter Winter
2014-06-23T23:59:59.000Z
We discuss the systematic decomposition of the dimension nine neutrinoless double beta decay operator, focusing on mechanisms with potentially small contributions to neutrino mass, while being accessible at the LHC. We first provide a (d=9 tree-level) complete list of diagrams for neutrinoless double beta decay. From this list one can easily recover all previously discussed contributions to the neutrinoless double beta decay process, such as the celebrated mass mechanism or "exotics", such as contributions from left-right symmetric models, R-parity violating supersymmetry and leptoquarks. More interestingly, however, we identify a number of new possibilities which have not been discussed in the literature previously. Contact to earlier works based on a general Lorentz-invariant parametrisation of the neutrinoless double beta decay rate is made, which allows, in principle, to derive limits on all possible contributions. We furthermore discuss possible signals at the LHC for mediators leading to the short-range part of the amplitude with one specific example. The study of such contributions would gain particular importance if there were a tension between different measurements of neutrino mass such as coming from neutrinoless double beta decay and cosmology or single beta decay.
Perez, Lennard
1997-01-01T23:59:59.000Z
overhead due to processor communication, loss in efficiency occurs due to spatial domain decomposition when subdomains become optically thin (less than about a mean free path in thickness). (By this, we refer to the fact that as the subdomain width... (in terms of problem size and domain width) for which spatial domain decomposition methods exhibit high and low degrees of scalability. ACKNOWLEDGMENTS I would like to especially thank Dr. Paul Nelson of the Computer Science Department at Texas...
The kinetics of microbial decomposition in a fecal pellet-seawater system
Kaplan, Warren Allan
1970-01-01T23:59:59.000Z
THE KINETICS OF MICROBIAL DECOMPOSITION IN A FECAL PELLET ? SEAWATER SYSTEM A Thesis WARREN ALLAN KAPLAE Submitted to the Graduate College of Texas A&K University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE... August 1970 Major Subject: Biological Oceanography THE KINETICS OF MICROBIAL DECOMPOSITION IN A FECAL PELLET ? SEAWATER SYSTEM A Thesis by WARREN ALLAN KAPLAN Approved as to sty1e and content by: airman of Committee Head of D a ment Member...
Caballero, F.G. [Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda Gregorio del Amo, 8, Madrid E-28040 (Spain); Yen, Hung-Wei [Department of Materials Science and Engineering, National Taiwan University, 1, Roosevelt Rd. Sec. 4, Taipei 10617, Taiwan (China); Australian Centre for Microscopy and Microanalysis, The University of Sydney, NSW 2006 (Australia); Miller, M.K. [Oak Ridge National Laboratory (ORNL), Materials Science and Technology Division, Oak Ridge, TN 37831-6139 (United States); Cornide, J. [Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda Gregorio del Amo, 8, Madrid E-28040 (Spain); Chang, Hsiao-Tzu [Department of Materials Science and Engineering, National Taiwan University, 1, Roosevelt Rd. Sec. 4, Taipei 10617, Taiwan (China); Garcia-Mateo, C. [Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avda Gregorio del Amo, 8, Madrid E-28040 (Spain); Yang, Jer-Ren [Department of Materials Science and Engineering, National Taiwan University, 1, Roosevelt Rd. Sec. 4, Taipei 10617, Taiwan (China)
2014-02-15T23:59:59.000Z
Interphase carbide precipitation due to austenite decomposition was investigated by high resolution transmission electron microscopy and atom probe tomography in tempered nanostructured bainitic steels. Results showed that cementite (?) forms by a paraequilibrium transformation mechanism at the bainitic ferrite–austenite interface with a simultaneous three phase crystallographic orientation relationship. - Highlights: • Interphase carbide precipitation due to austenite decomposition • Tempered nanostructured bainitic steels • High resolution transmission electron microscopy and atom probe tomography • Paraequilibrium ? with three phase crystallographic orientation relationship.
Adsorption and thermal decomposition of H2S on Si(100) Ying-Huang Lai a
Wu, Shin-Tson
Adsorption and thermal decomposition of H2S on Si(100) Ying-Huang Lai a , Chuin-Tih Yeh a , Yi Adsorption and thermal decomposition of H2S on Si(1 0 0)-2 Ã? 1 are studied by means of temperature-programmed desorption (TPD) and X-ray photoemission spectroscopy (XPS) with synchrotron radiation. The H2S molecule dis
Department of Mathematics MAL 522 (Statistical Inference)
Dharmaraja, S.
location parameter family the sample variance is ancillary. 9. Using Basu's theorem establish that sample parameter . Show that (Y1, Y2, . . . , Yn-1) where Yi = X(n) - X(i), i = 1, 2, . . . , n - 1 is ancillary or not the ancillary statistics (Y1, Y2, . . . , Yn-1) is independent of the minimal sufficient statistics of . 12
Department of Mathematics MAL 522 (Statistical Inference)
Dharmaraja, S.
with unknown mean . The reliability of equipment for time t is defined as the probability of failure free. 1100, 1085, 1585, 1602, 1540, 1250 Find ML estimate for reliability of the equipment for 1000 hours. 6 MLE of (µ1, µ2, 2 ). 5. The time to failure of an equipment follows exponential distribution
Department of Mathematics MAL 522 (Statistical Inference)
Dharmaraja, S.
. The time to failure of an equipment follows exponential distribution with unknown mean . The reliability, 1250 Find ML estimate for reliability of the equipment for 1000 hours. 6. Suppose that the random of equipment for time t is defined as the probability of failure free operation up to time t. The following
Dirk Pauly
2011-05-20T23:59:59.000Z
We study in detail Hodge-Helmholtz decompositions in non-smooth exterior domains filled with inhomogeneous and anisotropic media. We show decompositions of alternating differential forms belonging to weighted Sobolev spaces into irrotational and solenoidal forms. These decompositions are essential tools, for example, in electro-magnetic theory for exterior domains. In the appendix we translate our results to the classical framework of vector analysis.
Chan, Tony F.
Domain decomposition survey 143 Methods for Partial Differential Equations (R. Glowinski, G, eds), SIAM (Philadelphia, PA). W. P. Tang (1988), `Schwarz splitting and template operators
Lattice QCD with Domain Decomposition on Intel Xeon Phi Co-Processors
Simon Heybrock; Bálint Joó; Dhiraj D. Kalamkar; Mikhail Smelyanskiy; Karthikeyan Vaidyanathan; Tilo Wettig; Pradeep Dubey
2014-12-08T23:59:59.000Z
The gap between the cost of moving data and the cost of computing continues to grow, making it ever harder to design iterative solvers on extreme-scale architectures. This problem can be alleviated by alternative algorithms that reduce the amount of data movement. We investigate this in the context of Lattice Quantum Chromodynamics and implement such an alternative solver algorithm, based on domain decomposition, on Intel Xeon Phi co-processor (KNC) clusters. We demonstrate close-to-linear on-chip scaling to all 60 cores of the KNC. With a mix of single- and half-precision the domain-decomposition method sustains 400-500 Gflop/s per chip. Compared to an optimized KNC implementation of a standard solver [1], our full multi-node domain-decomposition solver strong-scales to more nodes and reduces the time-to-solution by a factor of 5.
Photo-fragmentation of the closo-carboranes Part 1: Energetics of Decomposition
Kilcoyne, Arthur L; Feng, Danqin; Liu, Jing; Hitchcock, Adam P.; Kilcoyne, A.L. David; Tyliszczak, Tolek; Riehs, Norman F.; Rühl, Eckart; Bozek, John D.; McIlroy, David; Dowben, Peter A.
2007-11-09T23:59:59.000Z
The ionic fragmentation following B 1s and C 1s excitation of three isomeric carborane cage compounds [closo-dicarbadodecaboranes: orthocarborane (1,2-C2B10H12), metacarborane (1,7-C2B10H12), and paracarborane (1,12-C2B10H12)], is compared with the energetics of decomposition. The fragmentation yields for all three molecules are quite similar. Thermodynamic cycles are constructed for neutral and ionic species in an attempt to systemically characterize single ion closo-carborane creation and fragmentation processes. Lower energy decomposition processes are favored. Among the ionic species, the photon induced decomposition isdominated by BH+ and BH2+ fragment loss. Changes in ion yield associated with core to bound excitations are observed.
Lattice QCD with Domain Decomposition on Intel Xeon Phi Co-Processors
Heybrock, Simon; Joo, Balint; Kalamkar, Dhiraj D.; Smelyanskiy, Mikhail; Vaidyanathan, Karthikeyan; Wettig, Tilo; Dubey, Pradeep
2014-12-01T23:59:59.000Z
The gap between the cost of moving data and the cost of computing continues to grow, making it ever harder to design iterative solvers on extreme-scale architectures. This problem can be alleviated by alternative algorithms that reduce the amount of data movement. We investigate this in the context of Lattice Quantum Chromodynamics and implement such an alternative solver algorithm, based on domain decomposition, on Intel Xeon Phi co-processor (KNC) clusters. We demonstrate close-to-linear on-chip scaling to all 60 cores of the KNC. With a mix of single- and half-precision the domain-decomposition method sustains 400-500 Gflop/s per chip. Compared to an optimized KNC implementation of a standard solver [1], our full multi-node domain-decomposition solver strong-scales to more nodes and reduces the time-to-solution by a factor of 5.
Jackson, Robert B.
decomposition data with process-based biogeochemical models is essential to quantify the turnover of organic to model multiple cohort decomposition, unifying both types of experimental data in one theory. Based models with a single time-dependent decay rate, and two models based on a continuous distribution
AN ADAPTIVE MIXED SCHEME FOR ENERGY-TRANSPORT SIMULATIONS OF FIELD-EFFECT TRANSISTORS
Pietra, Paola
AN ADAPTIVE MIXED SCHEME FOR ENERGY-TRANSPORT SIMULATIONS OF FIELD-EFFECT TRANSISTORS #3; STEFAN HOLST, ANSGAR J UNGEL y AND PAOLA PIETRA z Abstract. Energy-transport models are used in semiconductor simulations to account for ther- mal e#11;ects. The model consists of the continuity equations for the mass
Optical and elastic properties of diamond-like carbon with metallic inclusions: A theoretical study
for solar collectors, where the efficiency of the collector depends critically on the performance. INTRODUCTION Trough solar collectors are a technology for solar ther- mal energy conversion that can deliver emission-free solar power for on-site and centralized applications.1,2 The effi- ciency of the collector
EarlyOff: Using House Cooling Rates To Save Energy Microsoft Research, UK and
Krumm, John
Keywords Heating, Control, Occupancy, Departure, Predictive 1 Introduction In many regions of the world aimed at automatic control of heating systems based on predicting future occupancy, and heating up@microsoft.com Abstract Home heating systems often have a significant ther- mal inertia, as homes stay warm after
Johansson, Karl Henrik
energy requirements, there is a need for improving the energetic efficiency of existing buildings, Smart Buildings, Sustainable Control Systems, Copulas, Learning Abstract Heating, Ventilation and Air Conditioning (HVAC) sys- tems play a fundamental role in maintaining acceptable ther- mal comfort and Indoor
Mechanical engineering Department Seminar
power generation gas turbines and jet engines. As the energy efficiency of gas turbines in- creases to pro- vide thermal protection to turbine blades and vanes in the hottest sections of both electric with turbine inlet turbine, advances in turbine efficiency depend on improved ther- mal barrier coatings
Proceedings of ASME/Pacific Rim Technical Conference and Exhibition on Packaging and Integration of
Walker, D. Greg
of thermal and electrical transport properties are important to constructing an efficient direct energy density of states, which can improve the Seebeck coefficient and 2) reduced ther- mal transport due the results cannot be quantitatively compared to actual measurements, they show how their electrical behavior
Hague, Jim
efficiency for converting ther- mal into electrical energy between a hot source (TH) and a cold sink (Tc/Ge superlattice materials. Mobility spectrum analysis along with low temperature measurements indicate. Comparison of the results with modelling using the Boltzmann transport equation with scattering parameters
532 RESONANCE June 2015 GENERAL ARTICLE
Giri, Ranjit K.
utilizing ther- mal energy available via solar radiation. Phase change mate- rial (commonly known as PCM) when cooled and takes the form of steam (gas) when heated. The temperature at which it boils (boiling or a solid or condensing a vapor is called the heat of vaporization. 1.2 Latent Heat Storage System Latent
Robertson, Meldrum
; heat shock proteins; quanta; thermal stress; presynaptic; postsynaptic; neuromuscular Prior exposure such as synaptic function from subse- quent stress. The neurophysiological consequences of heat shock have not been is down-regulated during ther- mal stress, but the predominant heat shock protein hsp70 is rapidly induced
Unsteady Internal Forced-Convective Flow Under Dynamic Time-Dependent Boundary Temperature
Bahrami, Majid
thevariable ther- mal load on 1) thermal solar panels in thermal energy storage (TES) systems [13]; 2) power electronics of solar/wind/tidal energy con- version systems [4,5]; and 3) power electronics and electric motor9]. Solar thermal systems are widely used in solar powerplants and are being widely commercialized. Solar
Pandey, Ravi
Theoretical study of nonpolar surfaces of aluminum nitride: Zinc blende ,,110... and wurtzite ,,101 structure and electronic properties of the nonpolar surfaces, namely zinc blende 110 and wurtzite (10 1 and small ther- mal expansion coefficient. At ambient conditions, AlN crys- tallizes in the wurtzite phase
Short-Term Load Forecasting This paper discusses the state of the art in short-term load fore-
Gross, George
spectrum of time intervals. In therange of seconds, when load variationsare small and random, the automatic by a number of generation control functions such as hydro scheduling, unit commitment, hydro-ther- mal present, functions such as fuel, hydro, and maintenance scheduling are performed to ensure that the load
Growth of germanium-carbon alloys on silicon substrates by molecular beam epitaxy
Kolodzey, James
circulated in the growth chamber cryopanels to avoid ther- mal cycling which could loosen flakes of dust from was produced by thermal evaporation from a solid source of zonerefined polycrystal- line Ge in a pyrolytic by direct current. The C filament temperature was calculated from the dissipated power and the Stefan
Observer for the Rotor Temperature of IPMSM Andreas Specht, Joachim Bocker
Noé, Reinhold
hybrid drive-trains mostly include inte- rior permanent magnet synchronous machines (IPMSM). This type Terms--Automotive application, Electrical machine, Estimation technique, Flux model, Hybrid electric vehicle (HEV), Permanent magnet motor, Synchronous motor, Ther- mal stress I. INTRODUCTION Today's modern
Wong, Pak Kin
such as the domination of surface forces over inertial forces, the laminar nature of fluid flow, fast ther- mal to fully realize the potential of microfluidics. In this article, we review several promising system investigating the behavior and the manipulation of small amounts of fluids with characteristic length scales
9 10D&A SUMMER 2008 ISSUE 098 AnD ARchItEctURE
Perez, Richard R.
energy exceeds the world's energy comsumption by a factor of 1.500. Fossil fuels like oil and coal alone of Ocean ther- mal Energy conversion Resources, Journal of Energy Resources tech- nology December 2005 Productivity of the Biosphere. Springer-Verlag, 305-328. ISBn 0-3870-7083-4. Environmental Resources Group,6
Ris Energy Report 5 Solar thermal 41 by the end of 2004 about 110 million m2
Risø Energy Report 5 Solar thermal 41 6.3.2 by the end of 2004 about 110 million m2 of solar ther be within the competence of the existing solar thermal industry. Solar thermal PETER AHM, PA ENERgy LTD- mal collectors were installed worldwide. Figure 24 il- lustrates the energy contribution from
Turbulent velocity profiles in a tilted heat pipe J. Salort, X. Riedinger,
Paris-Sud XI, Université de
Turbulent velocity profiles in a tilted heat pipe J. Salort, X. Riedinger, E. Rusaouen, J the ther- mal behavior of a square heat pipe, depending on its inclination angle and the applied heat flux (stresses). Heat pipes, or gravital flows in vertical or inclined Also at College of Engineering
Mukhtar, Saqib
What is compost? Composting refers to biological decomposition and stabilization of organic materials by microorganisms under aerobic conditions (in the presence of oxygen). During the composting is production of good-quality compost that is biologically stable, relatively uniform in appearance, free
SPECTRAL DECOMPOSITION APPLIED TO TIME-LAPSE SEISMIC INTERPRETATION AT RULISON FIELD,
SPECTRAL DECOMPOSITION APPLIED TO TIME-LAPSE SEISMIC INTERPRETATION AT RULISON FIELD, GARFIELD focuses on the application of this technique to time-lapse seismic interpretation using nine-component 4D-lapse interpretation through a cross equalization process. I analyzed two time-lapse pairs of seismic surveys: 2003
Decomposition of Human Motion into Dynamics Based Primitives with Application to Drawing Tasks
Murray, Richard M.
experiments 1 Introduction Building systems that can detect and recognize human actions and activitiesDecomposition of Human Motion into Dynamics Based Primitives with Application to Drawing Tasks D dynamical systems and systems identification we develop a framework for the study of primitives for human
PROCEEDINGS OF 2006 PMAPS, STOCKHOLM, SWEDEN, JUNE 2006 A Global Decomposition Algorithm for
calculation which is obtained from many runs of MARS. In a single MARS run, the outage of This work are with the Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX 77843 USA (e. Improved versions of decomposition for including load and planned outages in a computationally efficient
Rapid Protein Side-Chain Packing via Tree Decomposition Jinbo Xu1,2
Xu, Jinbo
is the number of residues in the protein, M the number of interacting residue pairs, nrot the average number is taken into consideration, then our tree-decomposition based energy minimization algorithm is more than frequently used by structural biologists and pharmaceutical companies to analyze the structure features
coal and gasoline [3]. Moreover, hydrogen can be used in fuel cells to generate electricity, or directly as a transportation fuel [4]. Hydrogen can be generated from hydrocarbons and water resourcesPhotoelectrochemical hydrogen production from water/ methanol decomposition using Ag/TiO2
Turning Tangent Empirical Mode Decomposition: a framework for mono-and multivariate signals
Paris-Sud XI, Université de
processing with a very important topic of research and development in various fields such as biomedical1 Turning Tangent Empirical Mode Decomposition: a framework for mono- and multivariate signals-EMD, for both mono- and multivariate signals is proposed in this paper. It differs from the other approaches
Ayache, Simon
2012-09-03T23:59:59.000Z
level of geometric complexity. It has been carried out during a secondment to work at Rolls-Royce plc with the aim of sharing fundamental and applied research developments. In the PhD thesis, Proper Orthogonal Decomposition (POD) has been systematically...
Eddy mean flow decomposition and eddy diffusivity estimates in the tropical Pacific Ocean
Eddy mean flow decomposition and eddy diffusivity estimates in the tropical Pacific Ocean: 2] Eddy diffusivity of the surface velocity field in the tropical Pacific Ocean was estimated using diffusivity estimates in the tropical Pacific Ocean: 2. Results, J. Geophys. Res., 107(C10), 3154, doi:10
Comparative Density Functional Study of Methanol Decomposition on Cu4 and Co4 Clusters
Mehmood, Faisal; Greeley, Jeffrey P.; Zapol, Peter; Curtiss, Larry A.
2010-11-18T23:59:59.000Z
A density functional theory study of the decomposition of methanol on Cu4 and Co4 clusters is presented. The reaction intermediates and activation barriers have been determined for reaction steps to form H2 and CO. For both clusters, methanol decomposition initiated by C-H and O-H bond breaking was investigated. In the case of a Cu4 cluster, methanol dehydrogenation through hydroxymethyl (CH2OH), hydroxymethylene (CHOH), formyl (CHO), and carbon monoxide (CO) is found to be slightly more favorable. For a Co4 cluster, the dehydrogenation pathway through methoxy (CH3O) and formaldehyde (CH2O) is slightly more favorable. Each of these pathways results in formation of CO and H2. The Co cluster pathway is very favorable thermodynamically and kinetically for dehydrogenation. However, since CO binds strongly, it is likely to poison methanol decomposition to H2 and CO at low temperatures. In contrast, for the Cu cluster, CO poisoning is not likely to be a problem since it does not bind strongly, but the dehydrogenation steps are not energetically favorable. Pathways involving C-O bond cleavage are even less energetically favorable. The results are compared to our previous study of methanol decomposition on Pd4 and Pd8 clusters. Finally, all reaction energy changes and transition state energies, including those for the Pd clusters, are related in a linear, Broensted-Evans-Polanyi plot.
THE BETA-JACOBI MATRIX MODEL, THE CS DECOMPOSITION, AND GENERALIZED SINGULAR
Sutton, Brian
THE BETA-JACOBI MATRIX MODEL, THE CS DECOMPOSITION, AND GENERALIZED SINGULAR VALUE PROBLEMS ALAN EDELMAN AND BRIAN D. SUTTON Abstract. We provide a solution to the -Jacobi matrix model problem posed the algorithm on a Haar-distributed random matrix to produce the -Jacobi matrix model. The Jacobi ensemble on Rn
Partial wave decomposition of the N3LO equation of state
D. Davesne; J. Meyer; A. Pastore; J. Navarro
2014-12-05T23:59:59.000Z
By means of a partial wave decomposition, we separate their contributions to the equation of state of symmetric nuclear matter for the N3LO pseudo-potential. In particular, we show that although both the tensor and the spin-orbit terms do not contribute to the equation of state, they give a non-vanishing contribution to the separate (JLS) channels.
Image decomposition and restoration using total variation minimization and the H 1 norm
Soatto, Stefano
Image decomposition and restoration using total variation minimization and the H 1 norm Stanley-Osher-Fatemi, and of the results of Y. Meyer on oscillatory functions. An initial image f is decomposed into a cartoon part u. Meyer [7] proposed a new minimization problem, changing in (1) the L 2 norm of (f u) by another norm
IMAGE DECOMPOSITION AND RESTORATION USING TOTAL VARIATION MINIMIZATION AND THE H-1
Vese, Luminita A.
IMAGE DECOMPOSITION AND RESTORATION USING TOTAL VARIATION MINIMIZATION AND THE H-1 NORM STANLEY results of Meyer [Oscillating Patterns in Image Processing and Nonlinear Evolution Equations, Univ #12;350 STANLEY OSHER, ANDR´ES SOL´E, AND LUMINITA VESE which is the minimizer of this convex
Paris-Sud XI, Université de
Substances involved Effects 1921, Oppau - Germany 1947, Canada (NH4)2SO4/NH4NO3 NH4NO3 Explosion Fire 1947 materials NH4NO3/sodium salt of dichloroisocyanuric acid (SDIC) Explosion Fire followed by explosion to be considered: fire, decomposition and explosion. Whereas by itself AN is not combustible, it can thermally
BLIND CHANNEL IDENTIFICATION OF MISO SYSTEMS BASED ON THE CP DECOMPOSITION OF CUMULANT TENSORS
BLIND CHANNEL IDENTIFICATION OF MISO SYSTEMS BASED ON THE CP DECOMPOSITION OF CUMULANT TENSORS algorithm for identifying the parameters of MISO sys- tem. 1. INTRODUCTION We consider the following-Input Single-Output (MISO) channel, y[n] is the output signal. Signals and system are assumed to be complex
Domain Decomposition Algorithm and Analytical Simulation of Coupled Flow in Reservoir / Well System
Ewing, Richard E.
that the technological progress of horizontal well drilling has been recognized by the petroleum industry as a most e of the wall and acceleration terms in balance equation. In the present paper a model of a reservoir/wellDomain Decomposition Algorithm and Analytical Simulation of Coupled Flow in Reservoir / Well System
Domain Decomposition Algorithm and Analytical Simulation of Coupled Flow in Reservoir / Well System
Lazarov, Raytcho
of horizontal well drilling has been recognized by the petroleum industry as a most efficient technique of the wall and acceleration terms in balance equation. In the present paper a model of a reservoir/wellDomain Decomposition Algorithm and Analytical Simulation of Coupled Flow in Reservoir / Well System
Effect of temperature on the desorption and decomposition of mustard from activated carbon
Karwacki, C.J.; Buchanan, J.H.; Mahle, J.J.; Buettner, L.C.; Wagner, G.W.
1999-12-07T23:59:59.000Z
Experimental data are reported for the desorption of bis-2-chloroethyl sulfide, (a sulfur mustard or HD) and its decomposition products from activated coconut shell carbon (CSC). The results show that under equilibrium conditions changes in the HD partial pressure are affected primarily by its loading and temperature of the adsorbent. The partial pressure of adsorbed HD is found to increase by about a decade for each 25 C increase in temperature for CSC containing 0.01--0.1 g/g HD. Adsorption equilibria of HD appear to be little affected by coadsorbed water. Although complicated by its decomposition, the distribution of adsorbed HD (of known amount) appears to occupy pores of similar energy whether dry or in the presence of adsorbed water. On dry CSC adsorbed HD appears stable, while in the presence of water its decomposition is marked by hydrolysis at low temperature and thermal decomposition at elevated temperatures. The principal volatile products desorbed are 1,4-thioxane, 2-chloroethyl vinyl sulfide and 1,4-dithiane, with the latter favoring elevated temperatures.
THE NEXUS BETWEEN ENERGY CONSUMPTION AND ECONOMIC GROWTH IN OECD COUNTRIES: A DECOMPOSITION ANALYSIS
1 THE NEXUS BETWEEN ENERGY CONSUMPTION AND ECONOMIC GROWTH IN OECD COUNTRIES: A DECOMPOSITION the impacts of renewable and non-renewable energy consumption on economic activities to find out whether and both renewable and non-renewable energy consumption in the short- and long run. This finding confirms
Dantzig-Wolfe decomposition for real-time optimization -applied to the Troll west oil
Foss, Bjarne A.
of the Troll west oil rim, a petroleum asset with severe production optimization challenges due to rate: Optimization, Dantzig-Wolfe Decomposition, Petroleum production, Plantwide control. 1. INTRODUCTION Development and robust option for complex production systems. Moreover, the method compares favourable with earlier
Decomposition of Human Motion into Dynamics Based Primitives with Application to Drawing Tasks
Murray, Richard M.
to prevent a possible crime. Other applications include video-games and animation where virtual human motionDecomposition of Human Motion into Dynamics Based Primitives with Application to Drawing Tasks D dynamical systems and systems identification we develop a framework for the study of primitives for human
Warming accelerates decomposition of decades-old carbon in forest soils
(received for review January 10, 2012) Global climate carbon-cycle models predict acceleration of soilWarming accelerates decomposition of decades-old carbon in forest soils Francesca M. Hopkinsa,b,1, CA 94720; and d Energy and Resources Group, University of California, Berkeley, CA 94720 Edited
Kowal, Grzegorz; Lazarian, A., E-mail: kowal@astro.wisc.ed, E-mail: lazarian@astro.wisc.ed [Department of Astronomy, University of Wisconsin, 475 North Charter Street, Madison, WI 53706 (United States)
2010-09-01T23:59:59.000Z
We study compressible magnetohydrodynamic turbulence, which holds the key to many astrophysical processes, including star formation and cosmic-ray propagation. To account for the variations of the magnetic field in the strongly turbulent fluid, we use wavelet decomposition of the turbulent velocity field into Alfven, slow, and fast modes, which presents an extension of the Cho and Lazarian decomposition approach based on Fourier transforms. The wavelets allow us to follow the variations of the local direction of the magnetic field and therefore improve the quality of the decomposition compared to the Fourier transforms, which are done in the mean field reference frame. For each resulting component, we calculate the spectra and two-point statistics such as longitudinal and transverse structure functions as well as higher order intermittency statistics. In addition, we perform a Helmholtz- Hodge decomposition of the velocity field into incompressible and compressible parts and analyze these components. We find that the turbulence intermittency is different for different components, and we show that the intermittency statistics depend on whether the phenomenon was studied in the global reference frame related to the mean magnetic field or in the frame defined by the local magnetic field. The dependencies of the measures we obtained are different for different components of the velocity; for instance, we show that while the Alfven mode intermittency changes marginally with the Mach number, the intermittency of the fast mode is substantially affected by the change.
FUSION OF VISIBLE AND INFRARED IMAGES USING EMPIRICAL MODE DECOMPOSITION TO IMPROVE FACE RECOGNITION
Koschan, Andreas
FUSION OF VISIBLE AND INFRARED IMAGES USING EMPIRICAL MODE DECOMPOSITION TO IMPROVE FACE of Tennessee, Knoxville, TN-37996 ABSTRACT In this effort, we propose a new image fusion technique, utilizing). In this method, we decompose images from different imaging modalities into their IMFs. Fusion is performed
Myung, Noh-Hoon
Extraction of Vibration Components from a Rotating Propeller Model Based on Complex Empirical Mode dydynoel@kaist.ac.kr Abstract -- In this paper, we present extraction of vibration components embedded decomposition (CEMD), an extended version of EMD, is employed to extract the vibration components. With FEKO
Multi-Material Decomposition Using Statistical Image Reconstruction in X-Ray CT
Fessler, Jeffrey A.
and Jeffrey A. Fessler Abstract--Dual-energy (DE) CT scans provide two sets of measurements at two different-mean-square (RMS) errors. Index Terms--Computed tomography, dual energy, multi- material decomposition, statistical image reconstruction I. INTRODUCTION Dual-energy (DE) CT reconstruction methods typically re- construct
Kiran Kumar Bhogadi Decomposition and Generation of Minimal Strongly Connected Digraphs
Robinson, Robert W.
of this algorithm, we are also able to generate all the 2connected MSDs through 13 vertices in less than an hourKiran Kumar Bhogadi Decomposition and Generation of Minimal Strongly Connected Digraphs (Under the direction of Robert W. Robinson) A new algorithm for the generation of minimal strongly connected digraphs
Cortes, Corinna
Automated Decomposition of Build Targets Mohsen Vakilian, Raluca Sauciuc, J. David Morgenthaler, Vahab Mirrokni Google, USA {vakilian, ralucas, jdm, mirrokni}@google.com Abstract--A (build) target specifies the information that is needed to automatically build a software artifact. This paper focuses
Fast decomposition of pgroups in the Roquette category, for p > 2
Bouc, Serge
Fast decomposition of pgroups in the Roquette category, for p > 2 Serge Bouc Abstract : Let p be a prime number. In [9], I introduced the Roquette category R p of finite pgroups, which is an additive tensor category containing all finite pgroups among its objects. In R p , every finite pgroup P admits
Fast decomposition of p-groups in the Roquette category, for p > 2
Paris-Sud XI, UniversitÃ© de
Fast decomposition of p-groups in the Roquette category, for p > 2 Serge Bouc Abstract : Let p be a prime number. In [9], I introduced the Roquette category Rp of finite p-groups, which is an additive tensor category containing all finite p-groups among its objects. In Rp, every finite p-group P admits
Convergent Decomposition Solvers for Tree-reweighted Free Energies Jeremy Jancsary Gerald Matz
Convergent Decomposition Solvers for Tree-reweighted Free Energies Jeremy Jancsary Gerald Matz of tree- reweighted free energies for the purpose of obtaining approximate marginal probabil- ities given to the method by showing that it can be understood to min- imize the so-called Bethe free energy
Wright, Grady B.
of the water in the oceans (surface ocean currents). According to the Helmholtz-Hodge decomposition, any vector, these respective components of the horizontal ocean currents give information on gyres and overturning flow [35 applications from the atmospheric and oceanic sciences (e.g., in diagnosing the horizontal wind and ocean
Estimating Litter Decomposition Rate in Single-Pool Models Using Nonlinear Beta Regression
Thomas, David D.
Estimating Litter Decomposition Rate in Single-Pool Models Using Nonlinear Beta Regression Etienne the performance of nonlinear regression using the beta distribution, which is well-suited to bounded data and this type of heteroscedasticity, to standard nonlinear regression (normal errors) on simulated and real
Encapsulation of Nickel Nanoparticles in Carbon Obtained by the Sonochemical Decomposition of
Prozorov, Ruslan
Encapsulation of Nickel Nanoparticles in Carbon Obtained by the Sonochemical Decomposition of Ni(C8 A new precursor for the sonochemical preparation of amorphous nickel, Ni(cyclooctadiene)2, yielded relatively large (200 nm) amorphous nanoparticles composed of nickel and carbon atoms. Small nickel particles
Hydrogen production from methanol decomposition over Pt/Al2O3 and ceria promoted Pt/Al2O3 catalysts
Gulari, Erdogan
Hydrogen production from methanol decomposition over Pt/Al2O3 and ceria promoted Pt/Al2O3 catalysts-based catalysts in the production of hydrogen from methanol through catalytic decomposition rights reserved. Keywords: Methanol decomposition; Pt/alumina; Ceria; Hydrogen; PEM fuel cell 1
Choi, Jiyoung; Kang, Dong-Goo; Kang, Sunghoon; Sung, Younghun [Samsung Advanced Institute of Technology (SAIT), San 14, Nong-seo dong, Giheung-gu, Yongin, Kyunggi 446-712 (Korea, Republic of)] [Samsung Advanced Institute of Technology (SAIT), San 14, Nong-seo dong, Giheung-gu, Yongin, Kyunggi 446-712 (Korea, Republic of); Ye, Jong Chul [Bio-Imaging and Signal Processing Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejon 305-701 (Korea, Republic of)] [Bio-Imaging and Signal Processing Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejon 305-701 (Korea, Republic of)
2013-09-15T23:59:59.000Z
Purpose: Material decomposition using multienergy photon counting x-ray detectors (PCXD) has been an active research area over the past few years. Even with some success, the problem of optimal energy selection and three material decomposition including malignant tissue is still on going research topic, and more systematic studies are required. This paper aims to address this in a unified statistical framework in a mammographic environment.Methods: A unified statistical framework for energy level optimization and decomposition of three materials is proposed. In particular, an energy level optimization algorithm is derived using the theory of the minimum variance unbiased estimator, and an iterative algorithm is proposed for material composition as well as system parameter estimation under the unified statistical estimation framework. To verify the performance of the proposed algorithm, the authors performed simulation studies as well as real experiments using physical breast phantom and ex vivo breast specimen. Quantitative comparisons using various performance measures were conducted, and qualitative performance evaluations for ex vivo breast specimen were also performed by comparing the ground-truth malignant tissue areas identified by radiologists.Results: Both simulation and real experiments confirmed that the optimized energy bins by the proposed method allow better material decomposition quality. Moreover, for the specimen thickness estimation errors up to 2 mm, the proposed method provides good reconstruction results in both simulation and real ex vivo breast phantom experiments compared to existing methods.Conclusions: The proposed statistical framework of PCXD has been successfully applied for the energy optimization and decomposition of three material in a mammographic environment. Experimental results using the physical breast phantom and ex vivo specimen support the practicality of the proposed algorithm.
Thammajak, Nirawat; Battle, Peter D., E-mail: peter.battle@chem.ox.ac.uk; Brown, Catherine; Higgon, Katherine; Stansfield, Rhian
2014-01-15T23:59:59.000Z
Polycrystalline samples of Nd{sub 18}Li{sub 8}Fe{sub 4}M?O{sub 39} (M?=Al, Ga) and La{sub 18}Li{sub 8}Fe{sub 4.5}In{sub 0.5}O{sub 39} have been prepared by the ceramic method and characterised by neutron diffraction and magnetometry. All three compounds adopt a cubic structure (space group Pm3{sup ¯}n, a ?12 Å) based on intersecting ?1 1 1? chains of cation sites with alternating octahedral and prismatic coordination geometry. These sites are occupied by Li, Fe and M? or In; Nd or La cations occupy sites between the chains. The cation distribution over the octahedral and prismatic sites within the chains is disordered in all three compounds. The Nd-containing compositions show spin-glass behaviour below ?4.5 K whereas small, weakly-ferrimagnetic domains form in La{sub 18}Li{sub 8}Fe{sub 4.5}In{sub 0.5}O{sub 39} below 7.60 K. The dependence of the magnetic properties on the nature of the lanthanide cation is discussed. - Graphical abstract: At low temperatures Nd{sub 18}Li{sub 8}Fe{sub 4}M?O{sub 39} (M’=Al, Ga) behave as spin glasses whereas small ferrimagnetic domains form in La{sub 18}Li{sub 8}Fe{sub 4.5}In{sub 0.5}O{sub 39}. Display Omitted - Highlights: • p-Block cations can be accommodated in the La{sub 18}Li{sub 8}Rh{sub 5}O{sub 39} structure. • Small ferrimagnetic domains in La{sub 18}Li{sub 8}Fe{sub 4.5}In{sub 0.5}O{sub 39}. • Magnetic behaviour controlled by the lanthanide cation.
Data-driven spectral decomposition and forecasting of ergodic dynamical systems
Giannakis, Dimitrios
2015-01-01T23:59:59.000Z
We develop a framework for dimension reduction, mode decomposition, and nonparametric forecasting of data generated by ergodic dynamical systems. This framework is based on a representation of the Koopman group of unitary operators in a smooth orthonormal basis of the L2 space of the dynamical system, acquired from time-ordered data through the diffusion maps algorithm. Using this representation, we compute Koopman eigenfunctions through a regularized advection-diffusion operator, and employ these eigenfunctions in dimension reduction maps with projectible dynamics and high smoothness for the given observation modality. In systems with pure point spectra, we construct a decomposition of the generator of the Koopman group into mutually commuting vector fields, which we reconstruct in data space through a representation of the pushforward map in the Koopman eigenfunction basis. We also use a special property of this basis, namely that the basis elements evolve as simple harmonic oscillators, to build nonparamet...
Everett, Susan M [ORNL; Rawn, Claudia J [ORNL; Keffer, David J. [University of Tennessee, Knoxville (UTK); Mull, Derek L [ORNL; Payzant, E Andrew [ORNL; Phelps, Tommy Joe [ORNL
2013-01-01T23:59:59.000Z
Gas hydrates are known to have a slowed decomposition rate at ambient pressure and temperatures below the melting point of ice termed self-preservation or anomalous preservation. As hydrate exothermically decomposes, gas is released and water of the clathrate cages transforms into ice. Two regions of slowed decomposition for methane hydrate, 180 200 K and 230 260 K, were observed, and the kinetics were studied by in situ low temperature x-ray powder diffraction. The kinetic constants for ice formation from methane hydrate were determined by the Avrami model within each region and activation energies, Ea, were determined by the Arrhenius plot. Ea determined from the data for 180 200 K was 42 kJ/mol and for 230 260 K was 22 kJ/mol. The higher Ea in the colder temperature range was attributed to a difference in the microstructure of ice between the two regions.
Jacob, Rick E.; Carson, James P.
2014-01-01T23:59:59.000Z
Elastase dosed mice, whole lung and single lobe groups. Combines octree image decomposition with variogram-based analysis Results in promising novel approach for characterizing and measuring lung disease at different stages
A reduced-order model based on proper orthogonal decomposition for non-isothermal two-phase flows
Richardson, Brian Ross
2009-05-15T23:59:59.000Z
This thesis presents a study of reduced-order models based on proper orthogonal decomposition applied to non-isothermal transport phenomena in °uidized beds. A numerical °ow solver called Multiphase Flow with Interphase eXchanges (MFIX) was used...
Anagnostakis, Ioannis
2004-01-01T23:59:59.000Z
(cont.) to the design of a heuristic decomposed algorithm for solving the ROP problem. This decomposition methodology offers an original paradigm potentially applicable to the design of solution algorithms for a class of ...
Simple waves and a characteristic decomposition of the two dimensional compressible Euler equations
) with constant speed c has an interesting decomposition (t + cx)(t - cx)u = 0, (2) 1 Research partially supported #12;or (t - cx)(t + cx)u = 0 (3) known from elementary text books. One can rewrite them as +-u = 0, or -+u = 0, (4) where Â± = t Â± cx. Sometimes, the same fact is written in Riemann invariants tR + cxR = 0
Catalytic decomposition of Ba(NO3)2 on Pt(111)
Mudiyanselage, Kumudu; Weaver, Jason F.; Szanyi, Janos
2011-04-07T23:59:59.000Z
The decomposition of Ba(NO3)2 formed on BaO/Pt(111) (Pt(111) surface is partially covered by BaO) in the presence of CO was studied using temperature programmed desorption (TPD), infrared reflection absorption (IRA) and X-ray photoelectron (XP) spectroscopies. The exposure of BaO/Pt(111) to elevated NO2 pressure (1.0×10-4 Torr) at 450 K leads to the formation of Ba(NO3)2, chemisorbed O (OPt) and Pt-oxide-like domains. During TPD, the Ba(NO3)2 begins to thermally decompose near 490 K, releasing NO and NO2 with the maximum NOx desorption rate seen at 605 K. The OPt species formed following the exposure of BaO/Pt(111) to NO2 react with CO to release CO2 at 450 K. The consumption of OPt during CO oxidation initiates the migration of O from the Pt-oxide-like domains to the chemisorbed phase, where the CO oxidation reaction occurs. Therefore, the removal of OPt by CO leads to the reduction of oxidized Pt, and to the formation of metallic Pt(111) domains, where, subsequently, catalytic decomposition of Ba(NO3)2 can take place. The Pt-catalyzed decomposition of Ba(NO3)2 occurs readily at 450 K, a temperature much lower than the onset of the decomposition temperature of Ba(NO3)2 in the presence of oxidized Pt. This work was supported by the US Department of Energy Basic Energy Sciences' Chemical Sciences, Geosciences & Biosciences Division. Pacific Northwest National Laboratory is operated by Battelle for the US Department of Energy.
Constraints on the Decomposition of the Rotation Curves of Spiral Galaxies
B. Fuchs
2002-12-20T23:59:59.000Z
I discuss anew how arguments about the internal dynamics of galactic disks set constraints on the otherwise ambiguous decomposition of the rotation curves of spiral galaxies into the contributions by the various constituents of the galaxies. Analyzing the two sample galaxies NGC 3198 and NGC 2985 I conclude from the multiplicities of the spiral arms and the values of the Q disk stability parameters that the disks of both galaxies are `maximum disks'.
On the Convergence of the Decomposition Method for Support Vector Machines
Lin, Chih-Jen
such that y i 2 f1; 1g, the support vector technique requires the solution of the following optimization set B #26; f1; : : : ; lg whose size is q. De#12;ne N #17; f1; : : : ; lgnB and #11; k B and #11; k N and goto Step 2. The basic idea of the decomposition method is that in each iteration, the indices f1
Not Available
1994-10-01T23:59:59.000Z
The bibliography contains citations concerning the decomposition of toxic materials by biological means. Bacteria, enzymes, and bioluminescence are among the methods discussed. Bacteria and enzymes that digest toluene, polychlorinated biphenyls (PCBs), selenium wastes, oil shale waste, uranium, oil sludge, pesticides, rubber wastes, and pentachlorophenol are discussed. Flavobacterium and white rot fungus are among the biological agents highlighted. (Contains 250 citations and includes a subject term index and title list.)
Hydrodynamic Crossovers in Surface-Directed Spinodal Decomposition and Surface Enrichment
Prabhat K. Jaiswal; Sanjay Puri; Subir K. Das
2010-11-29T23:59:59.000Z
We present comprehensive molecular dynamics (MD) results for the kinetics of surface-directed spinodal decomposition (SDSD) and surface enrichment (SE) in binary mixtures at wetting surfaces. We study the surface morphology and the growth dynamics of the wetting and enrichment layers. The growth law for the thickness of these layers shows a crossover from a diffusive regime to a hydrodynamic regime. We provide phenomenological arguments to understand this crossover.
Cho-Duan-Ge decomposition of QCD in the constraintless Clairaut-type formalism
Michael L. Walker; Steven Duplij
2015-03-15T23:59:59.000Z
We apply the recently derived constraintless Clairaut-type formalism to the Cho-Duan-Ge decomposition in SU(2) QCD. We find nontrivial corrections to the physical equations of motion and that the contribution of the topological degrees of freedom is qualitatively different from that found by treating the monopole potential as though it were dynamic. We also find alterations to the field commutation relations that undermine the particle interpretation in the presence of the chromomonopole condensate.
Beier, Eric
2012-02-14T23:59:59.000Z
x LIST OF FIGURES FIGURE Page 1 A Subgradient Optimization Algorithm : : : : : : : : : : : : : : : : : : 9 2 The L-Shaped Algorithm : : : : : : : : : : : : : : : : : : : : : : : : : 12 3 The Progressive Hedging Algorithm... decomposition was first applied to stochastic programs with the develop- ment of the L-shaped algorithm Slyke and Wets (1969). L-shaped methods get their name because of the shape that the first-stage (x) decision vectors make with each set of scenario...
Hydrogen-terminated silicon nanowire photocatalysis: Benzene oxidation and methyl red decomposition
Lian, Suoyuan [Institute of Functional Nano and Soft Materials and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123 (China) [Institute of Functional Nano and Soft Materials and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123 (China); School of Chemical Engineering and Materials, Dalian Polytechnic University, Dalian 116034 (China); Tsang, Chi Him A. [Institute of Functional Nano and Soft Materials and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123 (China) [Institute of Functional Nano and Soft Materials and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123 (China); Centre of Super Diamond and Advanced Films, City University of Hong Kong, Hong Kong (China); Kang, Zhenhui, E-mail: zhkang@suda.edu.cn [Institute of Functional Nano and Soft Materials and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123 (China)] [Institute of Functional Nano and Soft Materials and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123 (China); Liu, Yang, E-mail: yangl@suda.edu.cn [Institute of Functional Nano and Soft Materials and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123 (China)] [Institute of Functional Nano and Soft Materials and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123 (China); Wong, Ningbew [Centre of Super Diamond and Advanced Films, City University of Hong Kong, Hong Kong (China)] [Centre of Super Diamond and Advanced Films, City University of Hong Kong, Hong Kong (China); Lee, Shuit-Tong [Institute of Functional Nano and Soft Materials and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123 (China) [Institute of Functional Nano and Soft Materials and Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123 (China); Centre of Super Diamond and Advanced Films, City University of Hong Kong, Hong Kong (China)
2011-12-15T23:59:59.000Z
Graphical abstract: H-SiNWs can catalyze hydroxylation of benzene and degradation of methyl red under visible light irradiation. Highlights: Black-Right-Pointing-Pointer Hydrogen-terminated silicon nanowires were active photocatalyst in the hydroxylation of benzene under light. Black-Right-Pointing-Pointer Hydrogen-terminated silicon nanowires were also effective in the decomposition of methyl red dye. Black-Right-Pointing-Pointer The Si/SiO{sub x} core-shell structure is the main reason of the obtained high selectivity during the hydroxylation. -- Abstract: Hydrogen-terminated silicon nanowires (H-SiNWs) were used as heterogeneous photocatalysts for the hydroxylation of benzene and for the decomposition of methyl red under visible light irradiation. The above reactions were monitored by GC-MS and UV-Vis spectrophotometry, respectively, which shows 100% selectivity for the transformation of benzene to phenol. A complete decomposition of a 2 Multiplication-Sign 10{sup -4} M methyl red solution was achieved within 30 min. The high selectivity for the hydroxylation of benzene and the photodecomposition demonstrate the catalytic activity of ultrafine H-SiNWs during nanocatalysis.
Calculation of excitation energies from the CC2 linear response theory using Cholesky decomposition
Baudin, Pablo, E-mail: baudin.pablo@gmail.com [Institute of Molecular Science, University of Valencia, Valencia, ES-46071 (Spain) [Institute of Molecular Science, University of Valencia, Valencia, ES-46071 (Spain); qLEAP – Center for Theoretical Chemistry, Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C (Denmark); Marín, José Sánchez; Cuesta, Inmaculada García; Sánchez de Merás, Alfredo M. J., E-mail: sanchez@uv.es [Institute of Molecular Science, University of Valencia, Valencia, ES-46071 (Spain)
2014-03-14T23:59:59.000Z
A new implementation of the approximate coupled cluster singles and doubles CC2 linear response model is reported. It employs a Cholesky decomposition of the two-electron integrals that significantly reduces the computational cost and the storage requirements of the method compared to standard implementations. Our algorithm also exploits a partitioning form of the CC2 equations which reduces the dimension of the problem and avoids the storage of doubles amplitudes. We present calculation of excitation energies of benzene using a hierarchy of basis sets and compare the results with conventional CC2 calculations. The reduction of the scaling is evaluated as well as the effect of the Cholesky decomposition parameter on the quality of the results. The new algorithm is used to perform an extrapolation to complete basis set investigation on the spectroscopically interesting benzylallene conformers. A set of calculations on medium-sized molecules is carried out to check the dependence of the accuracy of the results on the decomposition thresholds. Moreover, CC2 singlet excitation energies of the free base porphin are also presented.
DIRECT DECOMPOSITION OF METHANE TO HYDROGEN ON METAL LOADED ZEOLITE CATALYST
Lucia M. Petkovic; Daniel M. Ginosar; Kyle C. Burch; Harry W. Rollins
2005-08-01T23:59:59.000Z
The manufacture of hydrogen from natural gas is essential for the production of ultra clean transportation fuels. Not only is hydrogen necessary to upgrade low quality crude oils to high-quality, low sulfur ultra clean transportation fuels, hydrogen could eventually replace gasoline and diesel as the ultra clean transportation fuel of the future. Currently, refinery hydrogen is produced through the steam reforming of natural gas. Although efficient, the process is responsible for a significant portion of refinery CO2 emissions. This project is examining the direct catalytic decomposition of methane as an alternative to steam reforming. The energy required to produce one mole of hydrogen is slightly lower and the process does not require water-gas-shift or pressure-swing adsorption units. The decomposition process does not produce CO2 emissions and the product is not contaminated with CO -- a poison for PEM fuel cells. In this work we examined the direct catalytic decomposition of methane over a metal modified zeolite catalyst and the recovery of catalyst activity by calcination. A favorable production of hydrogen was obtained, when compared with previously reported nickel-zeolite supported catalysts. Reaction temperature had a strong influence on catalyst activity and on the type of carbon deposits. The catalyst utilized at 873 and 973 K could be regenerated without any significant loss of activity, however the catalyst utilized at 1073 K showed some loss of activity after regeneration.
Why Blow Away Heat? Harvest Server's Heat Using Ther-moelectric Generators
Huang, Polly
ABSTRACT This paper argues for harvesting energy from servers' wasted heat in data centers. Our approach. INTRODUCTION A data center consumes vast amount of electricity and produces enormous amount of wasted heat that needs to be removed by cooling facilities. This paper looks at wasted heat as opportunities for energy
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University explains: BALL LIGHTNING at hand the estimated diameter was between three inches and a foot nature of ball lightning is sowwhat obscure, as few persons have The re- Observed the origin of a ball by others. In one case, it was reported that three SUC- In die- A l l the ball lightning seen was reported
High pressure sulfuric acid decomposition experiments for the sulfur-iodine thermochemical cycle.
Velasquez, Carlos E; Reay, Andrew R.; Andazola, James C.; Naranjo, Gerald E.; Gelbard, Fred
2005-09-01T23:59:59.000Z
A series of three pressurized sulfuric acid decomposition tests were performed to (1) obtain data on the fraction of sulfuric acid catalytically converted to sulfur dioxide, oxygen, and water as a function of temperature and pressure, (2) demonstrate real-time measurements of acid conversion for use as process control, (3) obtain multiple measurements of conversion as a function of temperature within a single experiment, and (4) assess rapid quenching to minimize corrosion of metallic components by undecomposed acid. All four of these objectives were successfully accomplished. This report documents the completion of the NHI milestone on high pressure H{sub 2}SO{sub 4} decomposition tests for the Sulfur-Iodine (SI) thermochemical cycle project. All heated sections of the apparatus, (i.e. the boiler, decomposer, and condenser) were fabricated from Hastelloy C276. A ceramic acid injection tube and a ceramic-sheathed thermocouple were used to minimize corrosion of hot liquid acid on the boiler surfaces. Negligible fracturing of the platinum on zirconia catalyst was observed in the high temperature decomposer. Temperature measurements at the exit of the decomposer and at the entry of the condenser indicated that the hot acid vapors were rapidly quenched from about 400 C to less than 20 C within a 14 cm length of the flow path. Real-time gas flow rate measurements of the decomposition products provided a direct measurement of acid conversion. Pressure in the apparatus was preset by a pressure-relief valve that worked well at controlling the system pressure. However, these valves sometimes underwent abrupt transitions that resulted in rapidly varying gas flow rates with concomitant variations in the acid conversion fraction.
Tang Shaojie; Tang Xiangyang [Imaging and Medical Physics, Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1701 Uppergate Dr., C-5018, Atlanta, Georgia 30322 (United States); School of Automation, Xi'an University of Posts and Telecommunications, Xi'an, Shaanxi 710121 (China); Imaging and Medical Physics, Department of Radiology and Imaging Sciences, Emory University School of Medicine, 1701 Uppergate Dr., C-5018, Atlanta, Georgia 30322 (United States)
2012-09-15T23:59:59.000Z
Purposes: The suppression of noise in x-ray computed tomography (CT) imaging is of clinical relevance for diagnostic image quality and the potential for radiation dose saving. Toward this purpose, statistical noise reduction methods in either the image or projection domain have been proposed, which employ a multiscale decomposition to enhance the performance of noise suppression while maintaining image sharpness. Recognizing the advantages of noise suppression in the projection domain, the authors propose a projection domain multiscale penalized weighted least squares (PWLS) method, in which the angular sampling rate is explicitly taken into consideration to account for the possible variation of interview sampling rate in advanced clinical or preclinical applications. Methods: The projection domain multiscale PWLS method is derived by converting an isotropic diffusion partial differential equation in the image domain into the projection domain, wherein a multiscale decomposition is carried out. With adoption of the Markov random field or soft thresholding objective function, the projection domain multiscale PWLS method deals with noise at each scale. To compensate for the degradation in image sharpness caused by the projection domain multiscale PWLS method, an edge enhancement is carried out following the noise reduction. The performance of the proposed method is experimentally evaluated and verified using the projection data simulated by computer and acquired by a CT scanner. Results: The preliminary results show that the proposed projection domain multiscale PWLS method outperforms the projection domain single-scale PWLS method and the image domain multiscale anisotropic diffusion method in noise reduction. In addition, the proposed method can preserve image sharpness very well while the occurrence of 'salt-and-pepper' noise and mosaic artifacts can be avoided. Conclusions: Since the interview sampling rate is taken into account in the projection domain multiscale decomposition, the proposed method is anticipated to be useful in advanced clinical and preclinical applications where the interview sampling rate varies.
Ning, J. G.; Chu, L.; Ren, H. L., E-mail: huilanren@bit.edu.cn [State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081 (China)
2014-08-28T23:59:59.000Z
We base a quantitative acoustic emission (AE) study on fracture processes in alumina ceramics on wavelet packet decomposition and AE source location. According to the frequency characteristics, as well as energy and ringdown counts of AE, the fracture process is divided into four stages: crack closure, nucleation, development, and critical failure. Each of the AE signals is decomposed by a 2-level wavelet package decomposition into four different (from-low-to-high) frequency bands (AA{sub 2}, AD{sub 2}, DA{sub 2}, and DD{sub 2}). The energy eigenvalues P{sub 0}, P{sub 1}, P{sub 2}, and P{sub 3} corresponding to these four frequency bands are calculated. By analyzing changes in P{sub 0} and P{sub 3} in the four stages, we determine the inverse relationship between AE frequency and the crack source size during ceramic fracture. AE signals with regard to crack nucleation can be expressed when P{sub 0} is less than 5 and P{sub 3} more than 60; whereas AE signals with regard to dangerous crack propagation can be expressed when more than 92% of P{sub 0} is greater than 4, and more than 95% of P{sub 3} is less than 45. Geiger location algorithm is used to locate AE sources and cracks in the sample. The results of this location algorithm are consistent with the positions of fractures in the sample when observed under a scanning electronic microscope; thus the locations of fractures located with Geiger's method can reflect the fracture process. The stage division by location results is in a good agreement with the division based on AE frequency characteristics. We find that both wavelet package decomposition and Geiger's AE source locations are suitable for the identification of the evolutionary process of cracks in alumina ceramics.
Second test of base hydrolysate decomposition in a 0.04 gallon per minute scale reactor
Cena, R.J.; Thorsness, C.B.; Coburn, T.T.; Watkins, B.E.
1994-10-11T23:59:59.000Z
LLNL has built and operated a pilot plant for processing oil shale using recirculating hot solids. This pilot plant, was adapted in 1993 to demonstrate the feasibility of decomposing base hydrolysate, a mixture of sodium nitrite, sodium formate and other constituents. This material is the waste stream from the base hydrolysis process for destruction of energetic materials. In the Livermore process, the waste feed is thermally treated in a moving packed bed of ceramic spheres, where constituents in the waste decompose, in the presence of carbon dioxide, to form solid sodium carbonate and a suite of gases including: methane, carbon monoxide, oxygen, nitrogen oxides, ammonia and possibly molecular nitrogen. The ceramic spheres are circulated and heated, providing the energy required for thermal decomposition. The spheres provide a large surface area for evaporation and decomposition to occur, avoiding sticking and agglomeration of the waste. We performed a 2.5 hour test of the solids recirculation system, with continuous injection of approximately 0.04 gal/min of waste. Gasses from the packed bed reactor were directed through the lift pipe and water was not condensed. Potassium carbonate (0.356 M) was added to the hydrolysate prior to its introduction to the retort. Continuous on-line gas analysis was invaluable in tracking the progress of the experiment and quantifying the decomposition products. Analyses showed the primary solid product, collected in the lift exit cyclone, was indeed sodium carbonate, as expected. For the reactor condition studied in this test, N{sub 2}O was found to be the primary nitrogen bearing gas species. In the test, approximately equal quantities of ammonia and nitrogen bearing oxide gases were produced. Under proper conditions, this ammonia and NO{sub x} can be recombined downstream to form N{sub 2} and O{sub 2} as the primary effluent gases.
Dong, Xue; Niu, Tianye; Zhu, Lei, E-mail: leizhu@gatech.edu [Nuclear and Radiological Engineering and Medical Physics Programs, The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)] [Nuclear and Radiological Engineering and Medical Physics Programs, The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)
2014-05-15T23:59:59.000Z
Purpose: Dual-energy CT (DECT) is being increasingly used for its capability of material decomposition and energy-selective imaging. A generic problem of DECT, however, is that the decomposition process is unstable in the sense that the relative magnitude of decomposed signals is reduced due to signal cancellation while the image noise is accumulating from the two CT images of independent scans. Direct image decomposition, therefore, leads to severe degradation of signal-to-noise ratio on the resultant images. Existing noise suppression techniques are typically implemented in DECT with the procedures of reconstruction and decomposition performed independently, which do not explore the statistical properties of decomposed images during the reconstruction for noise reduction. In this work, the authors propose an iterative approach that combines the reconstruction and the signal decomposition procedures to minimize the DECT image noise without noticeable loss of resolution. Methods: The proposed algorithm is formulated as an optimization problem, which balances the data fidelity and total variation of decomposed images in one framework, and the decomposition step is carried out iteratively together with reconstruction. The noise in the CT images from the proposed algorithm becomes well correlated even though the noise of the raw projections is independent on the two CT scans. Due to this feature, the proposed algorithm avoids noise accumulation during the decomposition process. The authors evaluate the method performance on noise suppression and spatial resolution using phantom studies and compare the algorithm with conventional denoising approaches as well as combined iterative reconstruction methods with different forms of regularization. Results: On the Catphan©600 phantom, the proposed method outperforms the existing denoising methods on preserving spatial resolution at the same level of noise suppression, i.e., a reduction of noise standard deviation by one order of magnitude. This improvement is mainly attributed to the high noise correlation in the CT images reconstructed by the proposed algorithm. Iterative reconstruction using different regularization, including quadratic orq-generalized Gaussian Markov random field regularization, achieves similar noise suppression from high noise correlation. However, the proposed TV regularization obtains a better edge preserving performance. Studies of electron density measurement also show that our method reduces the average estimation error from 9.5% to 7.1%. On the anthropomorphic head phantom, the proposed method suppresses the noise standard deviation of the decomposed images by a factor of ?14 without blurring the fine structures in the sinus area. Conclusions: The authors propose a practical method for DECT imaging reconstruction, which combines the image reconstruction and material decomposition into one optimization framework. Compared to the existing approaches, our method achieves a superior performance on DECT imaging with respect to decomposition accuracy, noise reduction, and spatial resolution.
Knot Topology of Vacuum Space-Time and Vacuum Decomposition of Einstein's Theory
Y. M. Cho; Franklin H. Cho
2011-10-28T23:59:59.000Z
Viewing Einstein's theory as the gauge theory of Lorentz group, we construct the most general vacuum connections which have vanishing curvature tensor and show that the vacuum space-time can be classified by the knot topology $\\pi_3(S^3)\\simeq \\pi_3(S^2)$ of $\\pi_3(SO(3,1))$. With this we obtain the gauge independent vacuum decomposition of Einstein's theory to the vacuum and gauge covariant physical parts. We discuss the physical implications of our result in quantum gravity.
Completely positive maps within the framework of direct-sum decomposition of state space
Longjiang Liu; D. M. Tong
2014-07-08T23:59:59.000Z
We investigate completely positive maps for an open system interacting with its environment. The families of the initial states for which the reduced dynamics can be described by a completely positive map are identified within the framework of direct-sum decomposition of state space. They includes not only separable states with vanishing or nonvanishing quantum discord but also entangled states. A general expression of the families as well as the Kraus operators for the completely positive maps are explicitly given. It significantly extends the previous results.
Sub-band coding of images with Quadtree guided recursive polynomial decomposition
Ramirez, Emil Alfred B
1993-01-01T23:59:59.000Z
(n) = s * h(n), 17 Periodic Extension v(k) Filter Window Fig. 6. Periodic Extension in One Dimension. z(m) h(n ? rn), z(m + kN) h(n ? m), P z(l) . h(n+ klV ? m), i= ? 0O y(n+ he), where y(. ) is the filtered sequence and h( ) is the finite length... and Threshold Determination . 7 10 10 11 11 15 18 22 25 26 27 29 30 30 33 35 39 43 46 48 IV SYSTEM IMPLEMENTATION AND PERFORMANCE A. Decomposition Process 52 CHAPTER Page V B. Side Information C. GRPD Specific Side Information 1...
Application of subgroup decomposition in diffusion theory to gas cooled thermal reactor problem
Yasseri, S.; Rahnema, F. [Nuclear and Radiological Engineering and Medical Physics Program, George W. Woodruff School, Georgia Institute of Technology, Atlanta, GA 30332-0405 (United States)
2013-07-01T23:59:59.000Z
In this paper, the accuracy and computational efficiency of the subgroup decomposition (SGD) method in diffusion theory is assessed in a ID benchmark problem characteristic of gas cooled thermal systems. This method can be viewed as a significant improvement in accuracy of standard coarse-group calculations used for VHTR whole core analysis in which core environmental effect and energy angle coupling are pronounced. It is shown that a 2-group SGD calculation reproduces fine-group (47) results with 1.5 to 6 times faster computational speed depending on the stabilizing schemes while it is as efficient as single standard 6-group diffusion calculation. (authors)
Mehmood, Faisal; Rankin, Rees B.; Greeley, Jeffrey P.; Curtiss, Larry A.
2012-05-15T23:59:59.000Z
A combination of ?rst principles Density Functional Theory calculations and thermochemical scaling relationships are employed to estimate the thermochemistry and kinetics of methanol decomposition on unsupported subnanometer metal clusters. The approach uses binding energies of various atomic and molecular species, determined on the pure metal clusters, to develop scaling relationships that are then further used to estimate the methanol decomposition thermodynamics for a series of pure and bimetallic clusters with four atoms per cluster. Additionally, activation energy barriers are estimated from Brønsted–Evans–Polanyi plots relating transition and ?nal state energies on these clusters. The energetic results are combined with a simple, microkineticallyinspired rate expression to estimate reaction rates as a function of important catalytic descriptors, including the carbon and atomic oxygen binding energies to the clusters. Based on these analyses, several alloy clusters are identi?ed as promising candidates for the methanol decomposition reaction.
G. J. de Frias; W. Aquino; K. H. Pierson; M. W. Heinstein; B. W. Spencer
2014-03-01T23:59:59.000Z
One of the main computational issues with explicit dynamics simulations is the significant reduction of the critical time step as the spatial resolution of the finite element mesh increases. In this work, a selective mass scaling approach is presented that can significantly reduce the computational cost in explicit dynamic simulations, while maintaining accuracy. The proposed method is based on a multiscale decomposition approach that separates the dynamics of the system into low (coarse scales) and high frequencies (fine scales). Here, the critical time step is increased by selectively applying mass scaling on the fine scale component only. In problems where the response is dominated by the coarse (low frequency) scales, significant increases in the stable time step can be realized. In this work, we use the proper orthogonal decomposition (POD) method to build the coarse scale space. The main idea behind POD is to obtain an optimal low-dimensional orthogonal basis for representing an ensemble of high-dimensional data. In our proposed method, the POD space is generated with snapshots of the solution obtained from early times of the full-scale simulation. The example problems addressed in this work show significant improvements in computational time, without heavily compromising the accuracy of the results.
General Electric-Magnetic decomposition of fields, positivity and Rainich-like conditions
Jose M M Senovilla
2000-10-29T23:59:59.000Z
We show how to generalize the classical electric-magnetic decomposition of the Maxwell or the Weyl tensors to arbitrary fields described by tensors of any rank in general $n$-dimensional spacetimes of Lorentzian signature. The properties and applications of this decomposition are reviewed. In particular, the definition of tensors quadratic in the original fields and with important positivity properties is given. These tensors are usually called "super-energy" (s-e) tensors, they include the traditional energy-momentum, Bel and Bel-Robinson tensors, and satisfy the so-called Dominant Property, which is a straightforward generalization of the classical dominant energy condition satisfied by well-behaved energy-momentum tensors. We prove that, in fact, any tensor satisfying the dominant property can be decomposed as a finite sum of the s-e tensors. Some remarks about the conservation laws derivable from s-e tensors, with some explicit examples, are presented. Finally, we will show how our results can be used to provide adequate generalizations of the Rainich conditions in general dimension and for any physical field.
HYBRID SULFUR FLOWSHEETS USING PEM ELECTROLYSIS AND A BAYONET DECOMPOSITION REACTOR
Gorensek, M; William Summers, W
2008-05-30T23:59:59.000Z
A conceptual design is presented for a Hybrid Sulfur process for the production of hydrogen using a high-temperature nuclear heat source to split water. The process combines proton exchange membrane-based SO{sub 2}-depolarized electrolyzer technology being developed at Savannah River National Laboratory with silicon carbide bayonet decomposition reactor technology being developed at Sandia National Laboratories. Both are part of the US DOE Nuclear Hydrogen Initiative. The flowsheet otherwise uses only proven chemical process components. Electrolyzer product is concentrated from 50 wt% sulfuric acid to 75 wt% via recuperative vacuum distillation. Pinch analysis is used to predict the high-temperature heat requirement for sulfuric acid decomposition. An Aspen Plus{trademark} model of the flowsheet indicates 340.3 kJ high-temperature heat, 75.5 kJ low-temperature heat, 1.31 kJ low-pressure steam, and 120.9 kJ electric power are consumed per mole of H{sub 2} product, giving an LHV efficiency of 35.3% (41.7% HHV efficiency) if electric power is available at a conversion efficiency of 45%.
Mahajan, Devinder; Jones, Keith W.; Feng, Huan; Winters, William J.
2004-12-01T23:59:59.000Z
The use of methane hydrate as an energy source requires development of a reliable method for its extraction from its highly dispersed locations in oceanic margin sediments and permafrost. The high pressure (up to 70 MPa) and low temperature (272 K to 278 K) conditions under which hydrates are stable in the marine environment can be mimicked in a laboratory setting and several kinetic studies of pure methane hydrate decomposition have been reported. However, the effect of host sediments on methane hydrate occurrence and decomposition are required to develop reliable hydrate models. In this paper, we describe methods to measure sediment properties as they relate to pore-space methane gas hydrate. Traditional geotechnical techniques are compared to the micrometer level by use of the synchrotron Computed Microtomography (CMT) technique. CMT was used to measure the porosity at the micrometer level and to show pore-space pathways through field samples. Porosities for three sediment samples: one from a site on Georges Bank and two from the known Blake Ridge methane hydrate site, from different depths below the mud line were measured by traditional drying and by the new CMT techniques and found to be in good agreement. The integration of the two analytical approaches is necessary to enable better understanding of methane hydrate interactions with the surrounding sediment particles.
New Hampshire, University of
Purchasing Compost Compost, the end product of a controlled decomposition of plant and animal wastes, makes an excellent addition to lawn or garden soil. Adding compost to your soil helps improve both its drainage and waterholding properties. Compost stores plant nutrients and prevents them from
Murphy, Robert F.
Less is More: Compact Matrix Decomposition for Large Sparse Graphs Jimeng Sun Yinglian Xie Hui Given a large sparse graph, how can we find patterns and anomalies? Several important applications can be modeled as large sparse graphs, e.g., network traffic monitoring, research citation network analysis
Kik, Pieter
in fuel cell vehicles [3]. Methanol can be produced from a number of renewable resources such as black of electricity, and its promise for use in fuel cell technology, thus it has been the subject of intensive study-dependent decomposition of methanol (MeOH) over narrowly distributed Pt nanoparticles supported on nanocrystalline anatase
Hitchcock, Adam P.
Quantitative Mapping of Structured Polymeric Systems Using Singular Value Decomposition Analysis of Soft X-ray Images I. N. Koprinarov, A. P. Hitchcock,* C. T. McCrory, and R. F. Childs Department of this system. The sample was studied fully hydrated in order to perform the quantitative mapping when
7198 J. Org. Chem. 1995,60, 7198-7208 Gas Phase Decomposition of Conjugate Acid Ions of Simple
Morton, Thomas Hellman
(MTBE),ethyl (ETBE),n-propyl,isopropyl,and isobutyl tert-butyl ethers have been examined experimentally spectroscopy (MIKES) experiments on deuterated ions from MTBE and ETBE. Mechanistic possibilities are probed. Protonated ETBE yields a pair of unimolecular decomposition products, tert-butyl cation and protonated
Iglesia, Enrique
Isotopic and kinetic assessment of the mechanism of methane reforming and decomposition reactions reforming reactions. 1. Introduction Methane is an essential raw material in the synthesis of liquid fuels and petrochemical, but its strong CH bonds (439 kJ molÀ1 1 ) require active catalysts and severe reaction
Giannakis, Georgios
for Market Clearing With Large-Scale Demand Response Nikolaos Gatsis, Member, IEEE, and Georgios B. Giannakis, Fellow, IEEE Abstract--This paper is concerned with large-scale integration of demand response (DR) from--Aggregators, decomposition algorithms, demand response, demand-side management, pricing. NOMENCLATURE A. Constants, Sets
Torrellas, Josep
L1 Data Cache Decomposition for Energy Efficiency Michael Huang, Jose Renau, Seung-Moon Yoo they will have a power density close to a nuclear reac- tor [9]. Reducing the energy consumption of processor on energy-efficient designs for the L1 data cache. It is well known that smaller caches consume less energy
Photoinitiated H2CO unimolecular decomposition: Accessing H HCO products via S0 and T1 pathways
Reisler, Hanna
because they lie below the T1 barrier. Alternatively, at the high end of the energy range, the T1 pathway decomposition of formaldehyde via the H HCO radical channel has been examined at energies where the S0 and T1 with increasing energy , while the T1 pathway involves a barrier and therefore a tight transition state
Masud, Arif
. There are many processes in nat- ure that can be modeled using the Darcy flow equations. Oil extraction to be solenoidal (i.e., a divergence free vector field). The main issue is that the equations of Darcy flow leadA stabilized mixed finite element method for Darcy flow based on a multiscale decomposition
Vallino, Joseph J.
decomposition at the WB barrier. Sulfate reduction: SO4 2- + 2CH2O + 2H+ 2CO2 + H2S + 2H2O 1.2. Questions 2 Abstract Permeable reactive barriers can benefit aquatic ecosystems by using wood chips to remove carbon was more important in the wood from the barriers. Keywords Nitrate removal, Permeable Reactive
Mode Decomposition Method RONALD J. LAI Environmental Sciences Branch, Minerals Management Service, U investigation related to the shelf/slope dynamics studies sponsored by the Minerals Management Service (MMS). The development of deep water oil exploration and extraction in the GOM region has increased rapidly in recent
Ottino, Julio M.
OF POLYMER PYROLYSIS Principal Investigator: Linda J. Broadbelt Objective: The push to recycle plastics of the decomposition of polymers during pyrolysis. NORTHWESTERN CHEMICAL AND BIOLOGICAL ENGINEERING MECHANISTIC MODEL years as environmental concerns over landfill capacity continued to grow. Converting waste polymers
Cédric Lorcé
2009-01-27T23:59:59.000Z
In a set of two papers, we propose to study an old-standing problem, namely the electromagnetic interaction for particles of arbitrary spin. Based on the assumption that light-cone helicity at tree level and $Q^2=0$ should be conserved non-trivially by the electromagnetic interaction, we are able to derive \\emph{all} the natural electromagnetic moments for a pointlike particle of \\emph{any} spin. In this first paper, we propose a transparent decomposition of the electromagnetic current in terms of covariant vertex functions. We also define in a general way the electromagnetic multipole form factors, and show their relation with the electromagnetic moments. Finally, by considering the Breit frame, we relate the covariant vertex functions to multipole form factors.
Wijesekera, T.; Lyons, J.E.; Ellis, P.E. Jr.
1998-03-03T23:59:59.000Z
The invention comprises a method for the oxidation of alkanes to alcohols and for decomposition of hydroperoxides to alcohols utilizing new compositions of matter, which are metal complexes of porphyrins. Preferred complexes have hydrogen, haloalkyl or haloaryl groups in meso positions, two of the opposed meso atoms or groups being hydrogen or haloaryl, and two of the opposed meso atoms or groups being hydrogen or haloalkyl, but not all four of the meso atoms or groups being hydrogen. Other preferred complexes are ones in which all four of the meso positions are substituted with haloalkyl groups and the beta positions are substituted with halogen atoms. A new method of synthesizing porphyrinogens is also disclosed.
Wijesekera, Tilak (Glen Mills, PA); Lyons, James E. (Wallingford, PA); Ellis, Jr., Paul E. (Downingtown, PA)
1998-01-01T23:59:59.000Z
The invention comprises a method for the oxidation of alkanes to alcohols and for decomposition of hydroperoxides to alcohols utilizing new compositions of matter, which are metal complexes of porphyrins. Preferred complexes have hydrogen, haloalkyl or haloaryl groups in meso positions, two of the opposed meso atoms or groups being hydrogen or haloaryl, and two of the opposed meso atoms or groups being hydrogen or haloalkyl, but not all four of the meso atoms or groups being hydrogen. Other preferred complexes are ones in which all four of the meso positions are substituted with haloalkyl groups and the beta positions are substituted with halogen atoms. A new method of synthesizing porphyrinogens is also disclosed.
Validation of Heat Transfer Thermal Decomposition and Container Pressurization of Polyurethane Foam.
Scott, Sarah Nicole; Dodd, Amanda B.; Larsen, Marvin E. [Sandia National Laboratories, Albuquerque, NM; Suo-Anttila, Jill M. [Sandia National Laboratories, Albuquerque, NM; Erickson, Kenneth L
2014-09-01T23:59:59.000Z
Polymer foam encapsulants provide mechanical, electrical, and thermal isolation in engineered systems. In fire environments, gas pressure from thermal decomposition of polymers can cause mechanical failure of sealed systems. In this work, a detailed uncertainty quantification study of PMDI-based polyurethane foam is presented to assess the validity of the computational model. Both experimental measurement uncertainty and model prediction uncertainty are examined and compared. Both the mean value method and Latin hypercube sampling approach are used to propagate the uncertainty through the model. In addition to comparing computational and experimental results, the importance of each input parameter on the simulation result is also investigated. These results show that further development in the physics model of the foam and appropriate associated material testing are necessary to improve model accuracy.
Unveiling the Proton Spin Decomposition at a Future Electron-Ion Collider
Aschenauer, Elke C; Stratmann, M
2015-01-01T23:59:59.000Z
We present a detailed assessment of how well a future Electron-Ion Collider could constrain helicity parton distributions in the nucleon and, therefore, unveil the role of the intrinsic spin of quarks and gluons in the proton's spin budget. Any remaining deficit in this decomposition will provide the best indirect constraint on the contribution due to the total orbital angular momenta of quarks and gluons. Specifically, all our studies are performed in the context of global QCD analyses based on realistic pseudo-data and in the light of the most recent data obtained from polarized proton-proton collisions at BNL-RHIC that have provided evidence for a significant gluon polarization in the accessible, albeit limited range of momentum fractions. We also present projections on what can be achieved on the gluon's helicity distribution by the end of BNL-RHIC operations. All estimates of current and projected uncertainties are performed with the robust Lagrange multiplier technique.
Sapphire decomposition and inversion domains in N-polar aluminum nitride
Hussey, Lindsay, E-mail: lkhussey@ncsu.edu; White, Ryan M.; Kirste, Ronny; Bryan, Isaac; Guo, Wei; Osterman, Katherine; Haidet, Brian; Bryan, Zachary; Bobea, Milena; Collazo, Ramón; Sitar, Zlatko [Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695-7919 (United States); Mita, Seiji [HexaTech, Inc., 991 Aviation Pkwy, Suite 800, Morrisville, North Carolina 27560 (United States)
2014-01-20T23:59:59.000Z
Transmission electron microscopy (TEM) techniques and potassium hydroxide (KOH) etching confirmed that inversion domains in the N-polar AlN grown on c-plane sapphire were due to the decomposition of sapphire in the presence of hydrogen. The inversion domains were found to correspond to voids at the AlN and sapphire interface, and transmission electron microscopy results showed a V-shaped, columnar inversion domain with staggered domain boundary sidewalls. Voids were also observed in the simultaneously grown Al-polar AlN, however no inversion domains were present. The polarity of AlN grown above the decomposed regions of the sapphire substrate was confirmed to be Al-polar by KOH etching and TEM.
Data decomposition of Monte Carlo particle transport simulations via tally servers
Romano, Paul K., E-mail: paul.k.romano@gmail.com [Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 77 Massachusetts Ave., Cambridge, MA 02139 (United States); Siegel, Andrew R., E-mail: siegala@mcs.anl.gov [Argonne National Laboratory, Theory and Computing Sciences, 9700 S Cass Ave., Argonne, IL 60439 (United States); Forget, Benoit, E-mail: bforget@mit.edu [Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 77 Massachusetts Ave., Cambridge, MA 02139 (United States)] [Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 77 Massachusetts Ave., Cambridge, MA 02139 (United States); Smith, Kord, E-mail: kord@mit.edu [Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 77 Massachusetts Ave., Cambridge, MA 02139 (United States)] [Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 77 Massachusetts Ave., Cambridge, MA 02139 (United States)
2013-11-01T23:59:59.000Z
An algorithm for decomposing large tally data in Monte Carlo particle transport simulations is developed, analyzed, and implemented in a continuous-energy Monte Carlo code, OpenMC. The algorithm is based on a non-overlapping decomposition of compute nodes into tracking processors and tally servers. The former are used to simulate the movement of particles through the domain while the latter continuously receive and update tally data. A performance model for this approach is developed, suggesting that, for a range of parameters relevant to LWR analysis, the tally server algorithm should perform with minimal overhead on contemporary supercomputers. An implementation of the algorithm in OpenMC is then tested on the Intrepid and Titan supercomputers, supporting the key predictions of the model over a wide range of parameters. We thus conclude that the tally server algorithm is a successful approach to circumventing classical on-node memory constraints en route to unprecedentedly detailed Monte Carlo reactor simulations.
Decomposition of adsorbed VX on activated carbons studied by {sup 31}P MAS NMR
Ishay Columbus; Daniel Waysbort; Liora Shmueli; Ido Nir; Doron Kaplan [Israel Institute for Biological Research, Ness Ziona (Israel). Departments of Organic Chemistry and Physical Chemistry
2006-06-15T23:59:59.000Z
The fate of the persistent OP nerve agent O-ethyl S-(2-(diisopropylamino)ethyl) methylphosphonothioate (VX) on granular activated carbons that are used for gas filtration was studied by means of 31P magic angle spinning (MAS) NMR spectroscopy. Four types of activated carbon were used, including coal-based BPL. VX as vapor or liquid was adsorbed on carbon granules, and MAS NMR spectra were recorded periodically. The results show that at least 90% of the adsorbed VX decomposes within 20 days or less to the nontoxic ethyl methylphosphonic acid (EMPA) and bis(S-2-diisopropylaminoethane) ((DES){sub 2}). Decomposition occurred irrespective of the phase from which VX was loaded, the presence of metal impregnation on the carbon surface, and the water content of the carbon. Theoretical and practical aspects of the degradation are discussed. 17 refs., 6 figs., 3 tabs.
Leung, Kevin; Foster, Michael E; Ma, Yuguang; del la Hoz, Julibeth M Martinez; Sai, Na; Balbuena, Perla B
2014-01-01T23:59:59.000Z
Fluoroethylene carbonate (FEC) shows promise as an electrolyte additive for improving passivating solid-electrolyte interphase (SEI) films on silicon anodes used in lithium ion batteries (LIB). We apply density functional theory (DFT), ab initio molecular dynamics (AIMD), and quantum chemistry techniques to examine excess-electron-induced FEC molecular decomposition mechanisms that lead to FEC-modified SEI. We consider one- and two-electron reactions using cluster models and explicit interfaces between liquid electrolyte and model Li(x)Si(y) surfaces, respectively. FEC is found to exhibit more varied reaction pathways than unsubstituted ethylene carbonate. The initial bond-breaking events and products of one- and two-electron reactions are qualitatively similar, with a fluoride ion detached in both cases. However, most one-electron products are charge-neutral, not anionic, and may not coalesce to form effective Li+-conducting SEI unless they are further reduced or take part in other reactions. The implication...
Qian Zhao; Bao Yuan Sun; Wen Hui Long
2014-11-23T23:59:59.000Z
The isospin coupling-channel decomposition of the potential energy density functional is carried out within the covariant density functional theory, and their isospin and density dependence in particular the influence on the symmetry energy is studied. It is found that both isospin-singlet and isospin-triplet components of the potential energy play the dominant role in deciding the symmetry energy, especially when the Fock diagram is introduced. The results illustrate a quite different mechanism to the origin of the symmetry energy from the microscopic Brueckner-Hartree-Fock theory, and demonstrate the importance of the Fork diagram in the CDF theory, especially from the isoscalar mesons, in the isospin properties of the in-medium nuclear force at high density.
Growth and stability of oxidation resistant Si nanocrystals formed by decomposition of alkyl silanes
Zaitseva, N; Hamel, S; Dai, Z R; Saw, C; Williamson, A J; Galli, G
2007-01-12T23:59:59.000Z
The synthesis and characterization of 1-10 nm Si nanocrystals highly resistant to oxidation is described. The nanocrystals were prepared by thermal decomposition of tetramethylsilane at 680 C, or in a gold- induced catalytic process at lower temperatures down to 400-450 C using trioctylamine as an initial solvent. Transmission electron microscopic analysis of samples obtained in the presence of gold show that the nanocrystals form via solid-phase epitaxial attachment of Si to the gold crystal lattice. The results of computational modeling performed using first principles density functional theory (DFT) calculations predict that the enhanced stability of nanocrystals to oxidation is due to the presence of N or N-containing groups on the surface of nanocrystals.
Preparation of nanocrystalline perovskite KNbO{sub 3} by peroxo-precursor decomposition method
Tsuyumoto, Isao, E-mail: tsuyu@neptune.kanazawa-it.ac.jp [Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501 (Japan)] [Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501 (Japan); Kato, Tomohiro; Arai, Tatsuya [Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501 (Japan)] [Department of Applied Chemistry, College of Bioscience and Chemistry, Kanazawa Institute of Technology, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501 (Japan)
2010-12-15T23:59:59.000Z
Nanocrystalline perovskite KNbO{sub 3} is prepared by a peroxo-precursor decomposition method at moderate temperatures of 650-900 {sup o}C. Peroxo-heteropoly-niobic acid is prepared by direct reaction between NbC powder and H{sub 2}O{sub 2} aq, and mixing the peroxo-heteropoly-niobic acid with KOH aq yields an amorphous precursor salt. Perovskite KNbO{sub 3} is obtained by heating the precursor in air for 1 h at 650-900 {sup o}C. The X-ray diffraction patterns were well fitted with the space group Pm3m in the Rietveld analysis. The X-ray diffraction peak profiles and field emission scanning electron microscope images indicate the crystallite size is in the range of 25-35 nm.
Tensor decomposition in post-Hartree–Fock methods. II. CCD implementation
Benedikt, Udo; Böhm, Karl-Heinz; Auer, Alexander A., E-mail: alexander.auer@cec.mpg.de [Max-Planck-Institute for Chemical Energy Conversion, Stiftstraße 34 - 36, D-45470 Mülheim an der Ruhr (Germany)
2013-12-14T23:59:59.000Z
In a previous publication, we have discussed the usage of tensor decomposition in the canonical polyadic (CP) tensor format for electronic structure methods. There, we focused on two-electron integrals and second order Møller-Plesset perturbation theory (MP2). In this work, we discuss the CP format for Coupled Cluster (CC) theory and present a pilot implementation for the Coupled Cluster Doubles method. We discuss the iterative solution of the CC amplitude equations using tensors in CP representation and present a tensor contraction scheme that minimizes the effort necessary for the rank reductions during the iterations. Furthermore, several details concerning the reduction of complexity of the algorithm, convergence of the CC iterations, truncation errors, and the choice of threshold for chemical accuracy are discussed.
A decomposition approach to optimal reactive power dispatch in large-scale power systems
Deeb, N.I.
1989-01-01T23:59:59.000Z
Power systems network operation is aimed at reducing system losses and minimizing the operational cost while satisfying performance requirements in normal and contingency situations. In this project, the procedure for the reactive power optimization has the solutions for investment and operation subproblems. The global solution is an iterative process between these two subproblems using the Bender decomposition method. In the investment subproblem decisions for the capacity and location of new reactive sources are made. These decisions are used in the optimization of the system operation. The outstanding features of the proposed method are that it does not require any matrix inversion, will save computation time and memory space, and can be implemented on very large scale power systems. The method employs a linearized objective function and constraints, and is based on adjusting control variables which are tap positions of transformers and reactive power injections. Linear programming is used to calculate voltage increments, which would minimize transmission losses, and adjustments of control variables would be obtained by a modified Jacobian matrix. This approach would greatly simplify the application of Dantzig-Wolfe decomposition method for solving the operation subproblem. According to the mathematical features of the Dantzig-Wolfe method, a multi-area approach is implemented and system equations are decomposed into a master problem and several subproblems. The master problem is formed by constraints, which represent linking transmission lines between areas. Two updated techniques are incorporated in the method to enhance the optimization process, which would save additional computation time and memory space. The proposed method is applied to the IEEE-30 bus system, a 60-bus system, a 180-bus system and a 1200-bus system, and numerical results are presented.
Mimicking Natural Systems: Methane Hydrate Formation-Decomposition in Depleted Sediments
Eaton, M.; Jones, K; Mahajan, D
2009-01-01T23:59:59.000Z
We have initiated a systematic study of sediment-hydrate interaction under subsurface-mimic conditions to initially focus on marine hydrates. A major obstacle to studying natural hydrate systems has been the absence of a sophisticated mimic apparatus in which the hydrate formation phenomenon can be reproduced with precision. We have designed and constructed a bench-top unit, namely flexible integrated study of hydrates (FISH), for this purpose. The unit is fully instrumented to precisely record temperatures, pressures and changes in gas volume during absorption/evolution. The Labview software allows rapid and continuous data collection during the hydrate formation/dissociation cycle. In our integrated approach, several host sediments collected from Blake Ridge, a well-researched hydrate site, were characterized using the computed microtomography technique at Beamline X-26A of the National Synchrotron Light Source at Brookhaven National Laboratory. The characterized depleted sediments were then used to study the hydrate formation/decomposition kinetics under various pressures in the FISH unit. We report two hydrate formation methods: one under continuous methane gas-flow conditions (dynamic mode) and the other in which hydrates are formed from the dissolved gas phase by diffusion (static mode). Also reported is a depressurization method, namely the step-down pressure method, to yield gas evolution data. Data from such runs with host sediment from the deepest site (667 metres) is presented. During hydrate formation, the data reveals a temperature signature that is consistent with an exothermic hydrate formation event. In the decomposition cycle, data at various pressures was analysed to yield curves with similar slopes, suggesting a zero-order dependence. The capabilities of the FISH unit and the implications of these runs in establishing a database of sediment-hydrate kinetics and pore saturation are discussed.
Cogeneration Plant is Designed for Total Energy
Howell, H. D.; Vera, R. L.
1987-01-01T23:59:59.000Z
of a 200 MW combined cycle cogeneration plant located at Occidental Chemical Corporation's Battleground chlorine-caustic plant at La Porte, Texas. This successful application of a total energy management concept utilizing combined cycle... the electrical and ther mal energy requirements at its Battleground facility. Results of the feasibility study indicated that the combined cycle cogeneration-concept was the best al ternative when comparing energy efficiency, capital costs, environmental...
Design for, and Evaluation of Life Cycle Performance
Ahner, D. J.; Hall, E. W.
performance degradation will also be described. INTRODUCTION Deterioration of power plant equipment per formance is inevitable as its design ser vice life is utilized. Correspondingly, the planned and forced outage profile also increases as more..., operating procedures, equipment availabilities, etc. This paper discusses the general nature, and the ther mal interaction of power plant components as individual equipment degradation occurs, describing overall plant performance trends and quant...
Rasisuttha, S.; Haberl, J.
2004-01-01T23:59:59.000Z
electricity and heat domestic hot water. The solar energy system used in the analysis of the supplemental energy was a hybrid photovoltaic- thermal (PV-T2) collector system, which is a combination photovoltaic (for producing electricity) and solar... residential buildings is promising. One photovoltaic system, the hybrid photovoltaic-ther- mal (PV-T) collector system, has been investigated by several researchers over the last 20 years (Rockendorf et al., 1999). The hybrid photovoltaic-thermal (PV-T...
Ignacio Gomez; Mario Castagnino
2014-11-09T23:59:59.000Z
In this paper we study Spectral Decomposition Theorem [1] and translate it to quantum language by means of the Wigner transform. We obtain a quantum version of Spectral Decomposition Theorem (QSDT) which enables us to achieve three distinct goals: First, to rank Quantum Ergodic Hierarchy levels [2,3]. Second, to analyze the classical limit in quantum ergodic systems and quantum mixing systems. And third, and maybe most important feature, to find a relevant and simple connection between the first three levels of quantum ergodic hierarchy (ergodic, exact and mixing) and quantum spectrum. Finally, we illustrate the physical relevance of QSDT applying it to two examples: Microwave billiards [4,5] and a phenomenological Gamow model type [6,7].
Brodie, Eoin [Berkeley Lab
2013-03-01T23:59:59.000Z
Eoin Brodie of Berkeley Lab on "Succession of phylogeny and function during plant litter decomposition" at the 8th Annual Genomics of Energy & Environment Meeting on March 27, 2013 in Walnut Creek, Calif.
Mehmood, F.; Greeley, J.; Zapol, P.; Curtiss, L. A.
2010-08-12T23:59:59.000Z
A density functional theory study of the decomposition of methanol on Cu{sub 4} and Co{sub 4} clusters is presented. The reaction intermediates and activation barriers have been determined for reaction steps to form H{sub 2} and CO. For both clusters, methanol decomposition initiated by C-H and O-H bond breaking was investigated. In the case of a Cu{sub 4} cluster, methanol dehydrogenation through hydroxymethyl (CH{sub 2}OH), hydroxymethylene (CHOH), formyl (CHO), and carbon monoxide (CO) is found to be slightly more favorable. For a Co{sub 4} cluster, the dehydrogenation pathway through methoxy (CH{sub 3}O) and formaldehyde (CH{sub 2}O) is slightly more favorable. Each of these pathways results in formation of CO and H{sub 2}. The Co cluster pathway is very favorable thermodynamically and kinetically for dehydrogenation. However, since CO binds strongly, it is likely to poison methanol decomposition to H{sub 2} and CO at low temperatures. In contrast, for the Cu cluster, CO poisoning is not likely to be a problem since it does not bind strongly, but the dehydrogenation steps are not energetically favorable. Pathways involving C-O bond cleavage are even less energetically favorable. The results are compared to our previous study of methanol decomposition on Pd{sub 4} and Pd{sub 8} clusters. Finally, all reaction energy changes and transition state energies, including those for the Pd clusters, are related in a linear, Broensted?Evans?Polanyi plot.
Schmidt, A.J.; Freeman, H.D.; Brown, M.D.; Zacher, A.H.; Neuenschwander, G.N.; Wilcox, W.A.; Gano, S.R. [Pacific Northwest National Lab., Richland, WA (United States)] [Pacific Northwest National Lab., Richland, WA (United States); Kim, B.C.; Gavaskar, A.R. [Battelle Columbus Div., OH (United States)] [Battelle Columbus Div., OH (United States)
1996-02-01T23:59:59.000Z
Base Catalyzed Decomposition (BCD) is a chemical dehalogenation process designed for treating soils and other substrate contaminated with polychlorinated biphenyls (PCB), pesticides, dioxins, furans, and other hazardous organic substances. PCBs are heavy organic liquids once widely used in industry as lubricants, heat transfer oils, and transformer dielectric fluids. In 1976, production was banned when PCBs were recognized as carcinogenic substances. It was estimated that significant quantities (one billion tons) of U.S. soils, including areas on U.S. military bases outside the country, were contaminated by PCB leaks and spills, and cleanup activities began. The BCD technology was developed in response to these activities. This report details the evolution of the process, from inception to deployment in Guam, and describes the process and system components provided to the Navy to meet the remediation requirements. The report is divided into several sections to cover the range of development and demonstration activities. Section 2.0 gives an overview of the project history. Section 3.0 describes the process chemistry and remediation steps involved. Section 4.0 provides a detailed description of each component and specific development activities. Section 5.0 details the testing and deployment operations and provides the results of the individual demonstration campaigns. Section 6.0 gives an economic assessment of the process. Section 7.0 presents the conclusions and recommendations form this project. The appendices contain equipment and instrument lists, equipment drawings, and detailed run and analytical data.
Orthogonal decomposition as a design tool: With application to a mixing impeller
Sloan, Benjamin
2013-05-15T23:59:59.000Z
Digital manufacturing eliminates the expense and time required to develop custom products. By utilizing this technology, designers can quickly create a customized product specifically for their performance needs. But the timescale and expense from the engineering design workflows used to develop these customized products have not been adapted from the workflows used in mass production. In many cases these customized designs build upon already successful mass-produced products that were developed using conventional engineering design workflows. Many times as part of this conventional design process significant time is spent creating and validating high fidelity models that accurately predict the performance of the final design. These existing validated high fidelity models used for the mass-produced design can be reused for analysis and design of unknown products. This thesis explores the integration of reduced order modeling and detailed analysis into the engineering design workflow developing a customized design using digital manufacturing. Specifically, detailed analysis is coupled with proper orthogonal decomposition to enable the exploration of the design space while simultaneously shaping the model representing the design. This revised workflow is examined using the design of a laboratory scale overhead mixer impeller. The case study presented here is compared with the design of the Kar Dynamic Mixer impeller developed by The Dow Chemical Company. The result of which is a customized design for a refined set of operating conditions with improved performance.
Fiber Optic Sensing Technology for Detecting Gas Hydrate Formation and Decomposition
Rawn, Claudia J [ORNL; Leeman, John R [University of Oklahoma, Norman; Ulrich, Shannon M [ORNL; Alford, Jonathan E [ORNL; Phelps, Tommy Joe [ORNL; Madden, Megan Elwood [University of Oklahoma, Norman
2011-01-01T23:59:59.000Z
A fiber optic-based distributed sensing system (DSS) has been integrated with a large volume (72 L) pressure vessel providing high spatial resolution, time resolved, 3-D measurement of hybrid temperature-strain (TS) values within experimental sediment gas hydrate systems. Areas of gas hydrate formation (exothermic) and decomposition (endothermic) can be characterized through this proxy by time series analysis of discrete data points collected along the length of optical fibers placed within a sediment system. Data is visualized as a 'movie' of TS values along the length of each fiber over time. Experiments conducted in the Seafloor Processing Simulator (SPS) at Oak Ridge National Laboratory show clear indications of hydrate formation and dissociation events at expected P-T conditions given the thermodynamics of the CH4-H2O system. The high spatial resolution achieved with fiber optic technology makes the DSS a useful tool for visualizing time resolved formation and dissociation of gas hydrates in large-scale sediment experiments.
Nigel Cundy; Yongmin Cho; Weonjong Lee
2014-11-04T23:59:59.000Z
In the past few years, we have presented a new way of considering quark confinement. Through a careful choice of a Cho-Duan-Ge Abelian Decomposition, we can construct the QCD Wilson Loop in terms of an Abelian restricted field. The relationship between the QCD and restricted string tensions is exact; and we do not need to gauge fix, apply any path ordering of gauge links, or additional path integrals. This hints at why mesons are colour neutral. Furthermore, the Abelian restricted field contains two parts: a Maxwell term, and a topological term. The topological term can describe magnetic monopoles and other topological objects, which can be studied both numerically and theoretically. By examining the topological part of the restricted field strength we have found evidence suggesting that these objects, which will contribute to confinement if present, are indeed there. Previous studies have used simplifications, breaking the exact relationship between the restricted and QCD string tensions, but it was found that the topological term dominated the restricted string tension. Here we remove those simplifications, and show that the Abelian restricted field does indeed fully explain confinement. However, our results for how much of the restricted string tension arises from the topological objects show strong dependence on the lattice spacing and level of smearing, so we are not yet able to draw a definitive conclusion.
Decomposition of the total momentum in a linear dielectric into field and matter components
Crenshaw, Michael E., E-mail: michael.crenshaw@us.army.mil
2013-11-15T23:59:59.000Z
The long-standing resolution of the Abraham–Minkowski electromagnetic momentum controversy is predicated on a decomposition of the total momentum of a closed continuum electrodynamic system into separate field and matter components. Using a microscopic model of a simple linear dielectric, we derive Lagrangian equations of motion for the electric dipoles and show that the dielectric can be treated as a collection of stationary simple harmonic oscillators that are driven by the electric field and produce a polarization field in response. The macroscopic energy and momentum are defined in terms of the electric, magnetic, and polarization fields that travel through the dielectric together as a pulse of electromagnetic radiation. We conclude that both the macroscopic total energy and the macroscopic total momentum are entirely electromagnetic in nature for a simple linear dielectric in the absence of significant reflections. -- Highlights: •The total momentum in a dielectric is identified by conservation principles. •The total momentum in a dielectric cannot be decomposed into field and matter parts. •A component of momentum in a dielectric is due to motion of the polarization field.
Kevin Leung; Susan B. Rempe; Michael E. Foster; Yuguang Ma; Julibeth M. Martinez del la Hoz; Na Sai; Perla B. Balbuena
2014-01-17T23:59:59.000Z
Fluoroethylene carbonate (FEC) shows promise as an electrolyte additive for improving passivating solid-electrolyte interphase (SEI) films on silicon anodes used in lithium ion batteries (LIB). We apply density functional theory (DFT), ab initio molecular dynamics (AIMD), and quantum chemistry techniques to examine excess-electron-induced FEC molecular decomposition mechanisms that lead to FEC-modified SEI. We consider one- and two-electron reactions using cluster models and explicit interfaces between liquid electrolyte and model Li(x)Si(y) surfaces, respectively. FEC is found to exhibit more varied reaction pathways than unsubstituted ethylene carbonate. The initial bond-breaking events and products of one- and two-electron reactions are qualitatively similar, with a fluoride ion detached in both cases. However, most one-electron products are charge-neutral, not anionic, and may not coalesce to form effective Li+-conducting SEI unless they are further reduced or take part in other reactions. The implications of these reactions to silicon-anode based LIB are discussed.
Omitaomu, Olufemi A [ORNL; Protopopescu, Vladimir A [ORNL; Ganguly, Auroop R [ORNL
2011-01-01T23:59:59.000Z
A new approach is developed for denoising signals using the Empirical Mode Decomposition (EMD) technique and the Information-theoretic method. The EMD technique is applied to decompose a noisy sensor signal into the so-called intrinsic mode functions (IMFs). These functions are of the same length and in the same time domain as the original signal. Therefore, the EMD technique preserves varying frequency in time. Assuming the given signal is corrupted by high-frequency Gaussian noise implies that most of the noise should be captured by the first few modes. Therefore, our proposition is to separate the modes into high-frequency and low-frequency groups. We applied an information-theoretic method, namely mutual information, to determine the cut-off for separating the modes. A denoising procedure is applied only to the high-frequency group using a shrinkage approach. Upon denoising, this group is combined with the original low-frequency group to obtain the overall denoised signal. We illustrate our approach with simulated and real-world data sets. The results are compared to two popular denoising techniques in the literature, namely discrete Fourier transform (DFT) and discrete wavelet transform (DWT). We found that our approach performs better than DWT and DFT in most cases, and comparatively to DWT in some cases in terms of: (i) mean square error, (ii) recomputed signal-to-noise ratio, and (iii) visual quality of the denoised signals.
Search for gravitational wave bursts by wavelet packet decomposition: The detection algorithm
Camarda, M.; Ortolan, A. [Dipartimento di Ingegneria dell'Informazione, Via Gradenigo, 6/B, 35131 Padova (Italy); INFN Laboratori Nazionali di Legnaro, I-35020 Legnaro, Padova (Italy); INFN Laboratori Nazionali di Legnaro, I-35020 Legnaro, Padova (Italy)
2006-09-15T23:59:59.000Z
We present a novel method based on wavelet packet transformation for detection of gravitational wave (gw) bursts embedded in additive Gaussian noise. The method exploits a wavelet packet decomposition of observed data and performs detection of bursts at multiple time-frequency resolutions by the extreme value statistics. We discuss the performances of detection algorithms (efficiency and robustness) in the general framework of hypothesis testing. In particular, we compare the performances of wavelet packet (WP), matched filter (MF), and power filter (PF) algorithms by means of a complete Monte Carlo simulation of the output of a gw detector, with the detection efficiencies of MF and PF playing the role of upper and lower bounds, respectively. Moreover, the performances of impulsive filter (IF) algorithm, widely used in the data analysis of resonant gw detectors, have been investigated. Results we get by injecting chirplet signals confirm the expected performances in terms of efficiency and robustness. To illustrate the application of the new method to real data, we analyzed a few data sets of the resonant gw detector AURIGA.
Department of Mathematics MAL 250 (Probability and Stochastic Processes)
Dharmaraja, S.
components each with reliability 0.8. If the reliability of the system is to be at least 0.99, then the minimum number of components in this system is 3. 3. Let = {a, b, c, d}. Find three different -fields {Fn and C that x is divisible by 5. Are the events A, B and C independent? 16. An electronic assembly
Lin, Yuting [Tu and Yuen Center for Functional Onco-Imaging, Department of Radiological Sciences, University of California, Irvine, California (United States); Liu, Tian; Yang, Xiaofeng [Department of Radiation Oncology, Emory University Hospital, Winship Cancer Institute, Atlanta, Georgia (United States); Wang, Yuenan [Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, Maryland (United States); Khan, Mohammad K., E-mail: drkhurram2000@gmail.com [Department of Radiation Oncology, Emory University Hospital, Winship Cancer Institute, Atlanta, Georgia (United States)
2013-10-01T23:59:59.000Z
Purpose: The objective of this work is to characterize and quantify the impact of respiratory-induced prostate motion. Methods and Materials: Real-time intrafraction motion is observed with the Calypso 4-dimensional nonradioactive electromagnetic tracking system (Calypso Medical Technologies, Inc. Seattle, Washington). We report the results from a total of 1024 fractions from 31 prostate cancer patients. Wavelet transform was used to decompose the signal to extract and isolate the respiratory-induced prostate motion from the total prostate displacement. Results: Our results show that the average respiratory motion larger than 0.5 mm can be observed in 68% of the fractions. Fewer than 1% of the patients showed average respiratory motion of less than 0.2 mm, whereas 99% of the patients showed average respiratory-induced motion ranging between 0.2 and 2 mm. The maximum respiratory range of motion of 3 mm or greater was seen in only 25% of the fractions. In addition, about 2% patients showed anxiety, indicated by a breathing frequency above 24 times per minute. Conclusions: Prostate motion is influenced by respiration in most fractions. Real-time intrafraction data are sensitive enough to measure the impact of respiration by use of wavelet decomposition methods. Although the average respiratory amplitude observed in this study is small, this technique provides a tool that can be useful if one moves to smaller treatment margins (?5 mm). This also opens ups the possibility of being able to develop patient specific margins, knowing that prostate motion is not unpredictable.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Negassa, Wakene C.; Guber, Andrey K.; Kravchenko, Alexandra N.; Marsh, Terence L.; Hildebrandt, Britton; Rivers, Mark L.
2015-07-01T23:59:59.000Z
Physical protection of soil carbon (C) is one of the important components of C storage. However, its exact mechanisms are still not sufficiently lucid. The goal of this study was to explore the influence of soil structure, that is, soil pore spatial arrangements, with and without presence of plant residue on (i) decomposition of added plant residue, (ii) CO? emission from soil, and (iii) structure of soil bacterial communities. The study consisted of several soil incubation experiments with samples of contrasting pore characteristics with/without plant residue, accompanied by X-ray micro-tomographic analyses of soil pores and by microbial community analysis ofmore »amplified 16S–18S rRNA genes via pyrosequencing. We observed that in the samples with substantial presence of air-filled well-connected large (>30 µm) pores, 75–80% of the added plant residue was decomposed, cumulative CO? emission constituted 1,200 µm C g?¹ soil, and movement of C from decomposing plant residue into adjacent soil was insignificant. In the samples with greater abundance of water-filled small pores, 60% of the added plant residue was decomposed, cumulative CO? emission constituted 2,000 µm C g?¹ soil, and the movement of residue C into adjacent soil was substantial. In the absence of plant residue the influence of pore characteristics on CO? emission, that is on decomposition of the native soil organic C, was negligible. The microbial communities on the plant residue in the samples with large pores had more microbial groups known to be cellulose decomposers, that is, Bacteroidetes, Proteobacteria, Actinobacteria, and Firmicutes, while a number of oligotrophic Acidobacteria groups were more abundant on the plant residue from the samples with small pores. This study provides the first experimental evidence that characteristics of soil pores and their air/water flow status determine the phylogenetic composition of the local microbial community and directions and magnitudes of soil C decomposition processes.« less
Gorensek, M.; Edwards, T.
2009-06-11T23:59:59.000Z
A recuperative bayonet reactor design for the high-temperature sulfuric acid decomposition step in sulfur-based thermochemical hydrogen cycles was evaluated using pinch analysis in conjunction with statistical methods. The objective was to establish the minimum energy requirement. Taking hydrogen production via alkaline electrolysis with nuclear power as the benchmark, the acid decomposition step can consume no more than 450 kJ/mol SO{sub 2} for sulfur cycles to be competitive. The lowest value of the minimum heating target, 320.9 kJ/mol SO{sub 2}, was found at the highest pressure (90 bar) and peak process temperature (900 C) considered, and at a feed concentration of 42.5 mol% H{sub 2}SO{sub 4}. This should be low enough for a practical water-splitting process, even including the additional energy required to concentrate the acid feed. Lower temperatures consistently gave higher minimum heating targets. The lowest peak process temperature that could meet the 450-kJ/mol SO{sub 2} benchmark was 750 C. If the decomposition reactor were to be heated indirectly by an advanced gas-cooled reactor heat source (50 C temperature difference between primary and secondary coolants, 25 C minimum temperature difference between the secondary coolant and the process), then sulfur cycles using this concept could be competitive with alkaline electrolysis provided the primary heat source temperature is at least 825 C. The bayonet design will not be practical if the (primary heat source) reactor outlet temperature is below 825 C.
Mandelis, Andreas
for monitoring the modulated thermal (blackbody) radiation emitted from a material surface after photothermal to the diffusion length, u(f)m i n , Fig. 1. Sch
Lau, August
2010-01-01T23:59:59.000Z
The classical approach to solvability of a mathematical problem is to define a method which includes certain rules of operation or algorithms. Then using the defined method, one can show that some problems are solvable or not solvable or undecidable depending on the particular method. With numerical solutions implemented in a computer, it might be more practical to define solvability of a mathematical problem as a complex decomposition problem. The decomposition breaks the data into a simple part and a complex part. The simple part is the solvable part by the method prescribed in the problem definition. The complex part is the leftover of the simple part. Complex part can be viewed as the "residual" of data or operator. It should be interpreted and not to be discarded as useless. We will give different examples to illustrate the more practical definition of solvability. The complex part is not noise and should not be viewed as useless part of the data. It has its own merit in terms of topological or geologica...
Oladosu, Gbadebo A [ORNL
2009-01-01T23:59:59.000Z
This work applies the empirical mode decomposition (EMD) method to data on real quarterly oil price (West Texas Intermediate - WTI) and U.S. gross domestic product (GDP). This relatively new method is adaptive and capable of handling non-linear and non-stationary data. Correlation analysis of the decomposition results was performed and examined for insights into the oil-macroeconomy relationship. Several components of this relationship were identified. However, the principal one is that the medium-run cyclical component of the oil price exerts a negative and exogenous influence on the main cyclical component of the GDP. This can be interpreted as the supply-driven or supply-shock component of the oil price-GDP relationship. In addition, weak correlations suggesting a lagging demand-driven, an expectations-driven, and a long-run supply-driven component of the relationship were also identified. Comparisons of these findings with significant oil supply disruption and recession dates were supportive. The study identified a number of lessons applicable to recent oil market events, including the eventuality of persistent economic and price declines following a long oil price run-up. In addition, it was found that oil-market related exogenous events are associated with short- to medium-run price implications regardless of whether they lead to actual supply disruptions.
Matturro, M.G.; Reynolds, R.P.; Kastrup, R.V.; Pictroski, C.F.
1986-05-14T23:59:59.000Z
The chemistry of ozonides is of considerable interest from a practical and theoretical viewpoint. Thioozonide 1, formally the monosulfur-substituted ozonide of dimethylcyclobutadiene, has been proposed as an intermediate in the room temperature photooxidation of 2,5-dimethylthiophene. Subsequent low-temperature studies confirmed this structural assignment. When 1 is allowed to warm to room temperature, it rearranges to a mixture of sulfine 2 and cis- and trans-3-hexene-2,5-diones (3c and 3t). Recent examination of the thermal decomposition of 1 has led to a proposed mechanism involving a carbonyl sulfide 4 as an intermediate along the sulfur expulsion pathway to 3c; however, no experimental support for this hypothesis was given. Carbonyl O-sulfides have also been implicated as intermediates from the photolysis of oxathiiranes. The authors report evidence for the formation of 4 during the decomposition of 1 and that elemental sulfur (S/sub 8/) is formed during the reaction by concatenation of sulfur atoms or fragments (S/sub 2/, S/sub 3/, etc.).
Subber, Waad, E-mail: wsubber@connect.carleton.ca; Sarkar, Abhijit, E-mail: abhijit_sarkar@carleton.ca
2014-01-15T23:59:59.000Z
Recent advances in high performance computing systems and sensing technologies motivate computational simulations with extremely high resolution models with capabilities to quantify uncertainties for credible numerical predictions. A two-level domain decomposition method is reported in this investigation to devise a linear solver for the large-scale system in the Galerkin spectral stochastic finite element method (SSFEM). In particular, a two-level scalable preconditioner is introduced in order to iteratively solve the large-scale linear system in the intrusive SSFEM using an iterative substructuring based domain decomposition solver. The implementation of the algorithm involves solving a local problem on each subdomain that constructs the local part of the preconditioner and a coarse problem that propagates information globally among the subdomains. The numerical and parallel scalabilities of the two-level preconditioner are contrasted with the previously developed one-level preconditioner for two-dimensional flow through porous media and elasticity problems with spatially varying non-Gaussian material properties. A distributed implementation of the parallel algorithm is carried out using MPI and PETSc parallel libraries. The scalabilities of the algorithm are investigated in a Linux cluster.
Zhang, Keni; Moridis, G.J.; Wu, Y.-S.; Pruess, K.
2008-07-01T23:59:59.000Z
Simulation of the system behavior of hydrate-bearing geologic media involves solving fully coupled mass- and heat-balance equations. In this study, we develop a domain decomposition approach for large-scale gas hydrate simulations with coarse-granularity parallel computation. This approach partitions a simulation domain into small subdomains. The full model domain, consisting of discrete subdomains, is still simulated simultaneously by using multiple processes/processors. Each processor is dedicated to following tasks of the partitioned subdomain: updating thermophysical properties, assembling mass- and energy-balance equations, solving linear equation systems, and performing various other local computations. The linearized equation systems are solved in parallel with a parallel linear solver, using an efficient interprocess communication scheme. This new domain decomposition approach has been implemented into the TOUGH+HYDRATE code and has demonstrated excellent speedup and good scalability. In this paper, we will demonstrate applications for the new approach in simulating field-scale models for gas production from gas-hydrate deposits.
Yu, Chung-Chin [Department of Environmental Engineering, Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan (China) [Department of Environmental Engineering, Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan (China); Nano Materials Applications R and D Center, Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan (China); Yang, Kuang-Hsuan, E-mail: khy@mail.vnu.edu.tw [Department of Chemical and Materials Engineering, Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan (China) [Department of Chemical and Materials Engineering, Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan (China); Nano Materials Applications R and D Center, Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan (China); Liu, Yu-Chuan [Department of Chemical and Materials Engineering, Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan (China) [Department of Chemical and Materials Engineering, Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan (China); Nano Materials Applications R and D Center, Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan (China); Chen, Bo-Chuen [Department of Chemical and Materials Engineering, Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan (China)] [Department of Chemical and Materials Engineering, Vanung University, 1, Van Nung Road, Shuei-Wei Li, Chung-Li City, Taiwan (China)
2010-07-15T23:59:59.000Z
In this work, we report a new pathway to prepare size-controllable gold nanoparticles (NPs) on chitosan (Ch) in aqueous solutions for improving catalytic decomposition of acetaldehyde by pure gold NPs at room temperature. First, Au substrates were cycled in deoxygenated aqueous solutions containing 0.1N NaCl and 1 g/L Ch from -0.28 to +1.22 V vs Ag/AgCl at 500 mV/s for 200 scans. Then the solutions were irradiated with UV lights of different wavelengths to prepare size-controllable Au NPs on Ch. Experimental results indicate that the particle sizes of prepared NPs are increased when UV lights with longer wavelengths were employed. The particle sizes of resulted Au NPs can be controlled from 10 to 50 nm. Moreover, the decomposition of acetaldehydes in wines can be significantly enhanced by ca. 190% of magnitude due to the contribution of the adsorption of Au NPs on Ch.
Matsumura, Yukihiko; Nuessle, F.W.; Antal, M.J. Jr. [Univ. of Hawaii at Manoa, Honolulu, HI (United States)
1996-12-31T23:59:59.000Z
Recently, carbonaceous materials including activated carbon were proven to be effective catalysts for hazardous waste gasification in supercritical water. Using coconut shell activated carbon catalyst, complete decomposition of industrial organic wastes including methanol and acetic acid was achieved. During this process, the total mass of the activated carbon catalyst changes by two competing processes: a decrease in weight via gasification of the carbon by supercritical water, or an increase in weight by deposition of carbonaceous materials generated by incomplete gasification of the biomass feedstocks. The deposition of carbonaceous materials does not occur when complete gasification is realized. Gasification of the activated carbon in supercritical water is often favored, resulting in changes in the quality and quantity of the catalyst. To thoroughly understand the hazardous waste decomposition process, a more complete understanding of the behavior of activated carbon in pure supercritical water is needed. The gasification rate of carbon by water vapor at subcritical pressures was studied in relation to coal gasification and generating activated carbon.
Futatani, S. [France-Japan Magnetic Fusion Laboratory, CNRS, France; Bos, W.J.T. [CNRS, Ecole Centrale de Lyon, Universite Claude Bernard Lyon; Del-Castillo-Negrete, Diego B [ORNL; Schneider, Kai [Universite d'Aix-Marseille; Benkadda, S. [France-Japan Magnetic Fusion Laboratory, CNRS, France; Farge, Marie [Laboratoire de Meteorologie Dynamique-CNRL, Ecole Normale Superieure
2011-01-01T23:59:59.000Z
We assess two techniques for extracting coherent vortices out of turbulent flows: the wavelet based Coherent Vorticity Extraction (CVE) and the Proper Orthogonal Decomposition (POD). The former decomposes the flow field into an orthogonal wavelet representation and subsequent thresholding of the coefficients allows one to split the flow into organized coherent vortices with non-Gaussian statistics and an incoherent random part which is structureless. POD is based on the singular value decomposition and decomposes the flow into basis functions which are optimal with respect to the retained energy for the ensemble average. Both techniques are applied to direct numerical simulation data of two-dimensional drift-wave turbulence governed by Hasegawa Wakatani equation, considering two limit cases: the quasi-hydrodynamic and the quasi-adiabatic regimes. The results are compared in terms of compression rate, retained energy, retained enstrophy and retained radial flux, together with the enstrophy spectrum and higher order statistics. (c) 2010 Published by Elsevier Masson SAS on behalf of Academie des sciences.
Sivaramakrishnan, R.; Su, M.-C.; Michael, J. V.; Klippenstein, S. J.; Harding, L. B.; Ruscic, B. (Chemical Sciences and Engineering Division)
2011-04-21T23:59:59.000Z
The thermal decomposition of propane has been studied using both shock tube experiments and ab initio transition state theory-based master equation calculations. Dissociation rate constants for propane have been measured at high temperatures behind reflected shock waves using high-sensitivity H-ARAS detection and CH{sub 3} optical absorption. The two major dissociation channels at high temperature are C{sub 3}H{sub 8} {yields} CH{sub 3} + C{sub 2}H{sub 5} (eq 1a) and C{sub 3}H{sub 8} {yields} CH{sub 4} + C{sub 2}H{sub 4} (eq 1b). Ultra high-sensitivity ARAS detection of H-atoms produced from the decomposition of the product, C{sub 2}H{sub 5}, in (1a), allowed measurements of both the total decomposition rate constants, k{sub total}, and the branching to radical products, k{sub 1a}/k{sub total}. Theoretical analyses indicate that the molecular products are formed exclusively through the roaming radical mechanism and that radical products are formed exclusively through channel 1a. The experiments were performed over the temperature range 1417-1819 K and gave a minor contribution of (10 {+-} 8%) due to roaming. A multipass CH{sub 3} absorption diagnostic using a Zn resonance lamp was also developed and characterized in this work using the thermal decomposition of CH{sub 3}I as a reference reaction. The measured rate constants for CH{sub 3}I decomposition agreed with earlier determinations from this laboratory that were based on I-atom ARAS measurements. This CH{sub 3} diagnostic was then used to detect radicals from channel 1a allowing lower temperature (1202-1543 K) measurements of k1a to be determined. Variable reaction coordinate-transition state theory was used to predict the high pressure limits for channel (1a) and other bond fission reactions in C{sub 3}H{sub 8}. Conventional transition state theory calculations were also used to estimate rate constants for other tight transition state processes. These calculations predict a negligible contribution (<1%) from all other bond fission and tight transition state processes, indicating that the bond fission channel (1a) and the roaming channel (1b) are indeed the only active channels at the temperature and pressure ranges of the present experiments. The predicted reaction exo- and endothermicities are in excellent agreement with the current version of the Active Thermochemical Tables. Master equation calculations incorporating these transition state theory results yield predictions for the temperature and pressure dependence of the dissociation rate constants for channel 1a. The final theoretical results reliably reproduce the measured dissociation rate constants that are reported here and in the literature. The experimental data are well reproduced over the 500-2500 K and 1 x 10{sup -4} to 100 bar range (errors of {approx}15% or less) by the following Troe parameters for Ar as the bath gas: k{sub {infinity}} = 1.55 x 10{sup 24}T{sup -2.034} exp(-45490/T) s{sup -1}, k{sub 0} = 7.92 x 10{sup 53}T{sup -16.67} exp(-50380/T) cm{sup 3} s{sup -1}, and F{sub c} = 0.190 exp(-T/3091) + 0.810 exp(-T/128) + exp(-8829/T).
Meshcheryakov, Oleg
2014-01-01T23:59:59.000Z
Even a single excess electron or ion migrating on the surface of sensitive explosives can catalyze their gradual exothermic decomposition. Mechanisms underlying such a charge-induced gradual thermal decomposition of highly sensitive explosives can be different. If sensitive explosive is a polar liquid, intense charge-dipole attraction between excess surface charges and surrounding explosive molecules can result in repetitive attempts of solvation of these charges by polar explosive molecules. Every attempt of such uncompleted nonequilibrium solvation causes local exothermic decomposition of thermolabile polar molecules accompanied by further thermal jumping unsolvated excess charges to new surface sites. Thus, ionized mobile hot spots emerge on charged explosive surface. Stochastic migration of ionized hot spots on explosive surface causes gradual exothermic decomposition of the whole mass of the polar explosive. The similar gradual charge-catalyzed exothermic decomposition of both polar and nonpolar highly s...
Cai, C. [CEA, LIST, 91191 Gif-sur-Yvette, France and CNRS, SUPELEC, UNIV PARIS SUD, L2S, 3 rue Joliot-Curie, 91192 Gif-sur-Yvette (France)] [CEA, LIST, 91191 Gif-sur-Yvette, France and CNRS, SUPELEC, UNIV PARIS SUD, L2S, 3 rue Joliot-Curie, 91192 Gif-sur-Yvette (France); Rodet, T.; Mohammad-Djafari, A. [CNRS, SUPELEC, UNIV PARIS SUD, L2S, 3 rue Joliot-Curie, 91192 Gif-sur-Yvette (France)] [CNRS, SUPELEC, UNIV PARIS SUD, L2S, 3 rue Joliot-Curie, 91192 Gif-sur-Yvette (France); Legoupil, S. [CEA, LIST, 91191 Gif-sur-Yvette (France)] [CEA, LIST, 91191 Gif-sur-Yvette (France)
2013-11-15T23:59:59.000Z
Purpose: Dual-energy computed tomography (DECT) makes it possible to get two fractions of basis materials without segmentation. One is the soft-tissue equivalent water fraction and the other is the hard-matter equivalent bone fraction. Practical DECT measurements are usually obtained with polychromatic x-ray beams. Existing reconstruction approaches based on linear forward models without counting the beam polychromaticity fail to estimate the correct decomposition fractions and result in beam-hardening artifacts (BHA). The existing BHA correction approaches either need to refer to calibration measurements or suffer from the noise amplification caused by the negative-log preprocessing and the ill-conditioned water and bone separation problem. To overcome these problems, statistical DECT reconstruction approaches based on nonlinear forward models counting the beam polychromaticity show great potential for giving accurate fraction images.Methods: This work proposes a full-spectral Bayesian reconstruction approach which allows the reconstruction of high quality fraction images from ordinary polychromatic measurements. This approach is based on a Gaussian noise model with unknown variance assigned directly to the projections without taking negative-log. Referring to Bayesian inferences, the decomposition fractions and observation variance are estimated by using the joint maximum a posteriori (MAP) estimation method. Subject to an adaptive prior model assigned to the variance, the joint estimation problem is then simplified into a single estimation problem. It transforms the joint MAP estimation problem into a minimization problem with a nonquadratic cost function. To solve it, the use of a monotone conjugate gradient algorithm with suboptimal descent steps is proposed.Results: The performance of the proposed approach is analyzed with both simulated and experimental data. The results show that the proposed Bayesian approach is robust to noise and materials. It is also necessary to have the accurate spectrum information about the source-detector system. When dealing with experimental data, the spectrum can be predicted by a Monte Carlo simulator. For the materials between water and bone, less than 5% separation errors are observed on the estimated decomposition fractions.Conclusions: The proposed approach is a statistical reconstruction approach based on a nonlinear forward model counting the full beam polychromaticity and applied directly to the projections without taking negative-log. Compared to the approaches based on linear forward models and the BHA correction approaches, it has advantages in noise robustness and reconstruction accuracy.
Boyer, Edmond
in the patient head. Yet, the skull anisotropy happens to be highly anisotropic, and must then be modeled.e. for the brain and the scalp). A domain decomposition (DD) framework allows to split the global system. This work presents such a coupling formulation of a 3-DD method solving iteratively a BEM for the brain
Salo, Heikki; Laine, Jarkko; Comerón, Sebastien; Gadotti, Dimitri A; Buta, Ron; Sheth, Kartik; Zaritsky, Dennis; Ho, Luis; Knapen, Johan; Athannassoula, E; Bosma, Albert; Laine, Seppo; Cisternas, Mauricio; Kim, Taehyun; Regan, Juan Carlos Muñoz-Mateos Michael; Hinz, Joannah L; de Paz, Armando Gil; Menendez-Delmestre, Karin; Mizusawa, Trisha; Erroz-Ferrer, Santiago; Meidt, Sharon E; Querejeta, Miguel
2015-01-01T23:59:59.000Z
The Spitzer Survey of Stellar Structure in Galaxies (S$^4$G, Sheth et. al. 2010) is a deep 3.6 and 4.5 $\\mu$m imaging survey of 2352 nearby ($pipeline 4, which is dedicated to 2-dimensional structural surface brightness decompositions of 3.6 $\\mu$m images, using GALFIT3.0 \\citep{peng2010}. Besides automatic 1-component S\\'ersic fits, and 2-component S\\'ersic bulge + exponential disk fits, we present human supervised multi-component decompositions, which include, when judged appropriate, a central point source, bulge, disk, and bar components. Comparison of the fitted parameters indicates that multi-component models are needed to obtain reliable estimates for the bulge S\\'ersic index and bulge-to-total light ratio ($B/T$), confirming earlier results \\citep{laurikainen2007, gadotti2008, weinzirl2009}. In this first paper, we describe the preparations of input data done for decompositions, give examples of our decomposition strategy, and describe the d...
Senroy, Nilanjan (New Delhi, IN); Suryanarayanan, Siddharth (Littleton, CO)
2011-03-15T23:59:59.000Z
A computer-implemented method of signal processing is provided. The method includes generating one or more masking signals based upon a computed Fourier transform of a received signal. The method further includes determining one or more intrinsic mode functions (IMFs) of the received signal by performing a masking-signal-based empirical mode decomposition (EMD) using the at least one masking signal.
Paris 7 - Denis Diderot, Université
- putational cost, which facilitates the processing of long signals. Re- sults show that this algorithm is very1808 IEEE TRANSACTIONS ON AUDIO, SPEECH, AND LANGUAGE PROCESSING , VOL. 14, NO. 5, SEPTEMBER 2006 Sparse and Structured Decompositions of Signals With the Molecular Matching Pursuit Laurent Daudet
Kik, Pieter
Applied Catalysis A: General 350 (2008) 207216 A R T I C L E I N F O Article history: Received 14 June.R. Cuenya). Contents lists available at ScienceDirect Applied Catalysis A: General journal homepage: Methanol decomposition Bimetallic nanoparticles Segregation Catalysis A B S T R A C T We present here
Sklenak, Stepan
Structure and critical function of Fe and acid sites in Fe-ZSM-5 in propane oxidative species Steamed Fe-zeolites Mössbauer spectroscopy UVVis FTIR H2-TPR N2O decomposition Propane oxidative of propane to propene with N2O. The evacuated non-steamed FeH-ZSM-5 contained high concentration of Brønsted
Florida, University of
Decomposition of Fresh and Anaerobically Digested Plant Biomass in Soil1 K. K. MOORHEAD, D. A to produce CH4 or added to soil directly as an amendment.In this study, fresh and anaerobically digested. The fresh plant biomassand digested biomasssludgewere freeze- dried and groundto passa0.84-mm sieve
Matsumura, Yukihiko; Nuessle, F.W.; Antal, M.J. Jr. [Univ. of Hawaii at Manoa, Honolulu, HI (United States)
1996-10-01T23:59:59.000Z
Recently, carbonaceous materials were proved to be effective catalysts for hazardous waste decomposition in supercritical water. Gasification of the carbonaceous catalyst itself is also expected, however, under supercritical conditions. Thus, it is essential to determine the gasification rate of the carbonaceous materials during this process to determine the active lifetime of the catalysts. For this purpose, the gasification characteristics of granular coconut shell activated carbon in supercritical water alone (600-650{degrees}C, 25.5-34.5 MPa) were investigated. The gasification rate at subatmospheric pressure agreed well with the gasification rate at supercritical conditions, indicating the same reaction mechanism. Methane generation under these conditions is via pyrolysis, and thus is not affected by the water pressure. An iodine number increase of 25% was observed as a result of the supercritical water gasification.
Zhivotov, V.K.; Levitskii, A.A.; Macheret, S.O.; Polak, L.S.
1986-05-01T23:59:59.000Z
The authors carry out a model calculation of the kinetics of the decomposition of carbon dioxide in the presence of sulfur in a moderate-pressure nonequilibrium discharge. The process is stimulated by the vibrational excitation of CO/sub 2/. Kinetic curves and the time variation of the vibrational and translational temperatures are calculated. The dependence of the energy efficiency on the specific energy input has been obtained. The optimal energy input is 4 J/cm/sup 3/. The minimal energy comsumption per CO molecule is 2.7-3.5 eV. The results of the calculations are consistent with the experimental results in the case of a nonequilibrium UHF discharge. The mechanism of the process, which accounts for the results, particularly the higher efficiency of the process in comparison to the dissociation of pure CO/sub 2/, has been ascertained.
Oladosu, Gbadebo A [ORNL; Kline, Keith L [ORNL; Uria Martinez, Rocio [ORNL; Eaton, Laurence M [ORNL
2011-01-01T23:59:59.000Z
The use of corn for ethanol production in the United States quintupled between 2001 and 2009, generating concerns that this could lead to the conversion of forests and grasslands around the globe, known as indirect land-use change (iLUC). Estimates of iLUC and related food versus fuel concerns rest on the assumption that the corn used for ethanol production in the United States would come primarily from displacing corn exports and land previously used for other crops. A number of modeling efforts based on these assumptions have projected significant iLUC from the increases in the use of corn for ethanol production. The current study tests the veracity of these assumptions through a systematic decomposition analysis of the empirical data from 2001 to 2009. The logarithmic mean divisia index decomposition method (Type I) was used to estimate contributions of different factors to meeting the corn demand for ethanol production. Results show that about 79% of the change in corn used for ethanol production can be attributed to changes in the distribution of domestic corn consumption among different uses. Increases in the domestic consumption share of corn supply contributed only about 5%. The remaining contributions were 19% from added corn production, and 2% from stock changes. Yield change accounted for about two-thirds of the contributions from production changes. Thus, the results of this study provide little support for large land-use changes or diversion of corn exports because of ethanol production in the United States during the past decade.
Isotope effect in the photochemical decomposition of CO{sub 2} (ice) by Lyman-{alpha} radiation
Yuan Chunqing; Yates, John T. Jr. [Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904 (United States)
2013-04-21T23:59:59.000Z
The photochemical decomposition of CO{sub 2}(ice) at 75 K by Lyman-{alpha} radiation (10.2 eV) has been studied using transmission infrared spectroscopy. An isotope effect in the decomposition of the CO{sub 2} molecule in the ice has been discovered, favoring {sup 12}CO{sub 2} photodecomposition over {sup 13}CO{sub 2} by about 10%. The effect is caused by electronic energy transfer from the excited CO{sub 2} molecule to the ice matrix, which favors quenching of the heavier electronically-excited {sup 13}CO{sub 2} molecule over {sup 12}CO{sub 2}. The effect is similar to the Menzel-Gomer-Redhead isotope effect in desorption from adsorbed molecules on surfaces when electronically excited. An enhancement of the rate of formation of lattice-trapped CO and CO{sub 3} species is observed for the photolysis of the {sup 12}CO{sub 2} molecule compared to the {sup 13}CO{sub 2} molecule in the ice. Only 0.5% of the primary photoexcitation results in O-CO bond dissociation to produce trapped-CO and trapped-CO{sub 3} product molecules and the majority of the electronically-excited CO{sub 2} molecules return to the ground state. Here either vibrational relaxation occurs (majority process) or desorption of CO{sub 2} occurs (minority process) from highly vibrationally-excited CO{sub 2} molecules in the ice. The observation of the {sup 12}C/{sup 13}C isotope effect in the Lyman-{alpha} induced photodecomposition of CO{sub 2} (ice) suggests that over astronomical time scales the isotope enrichment effect may distort historical information derived from isotope ratios in space wherever photochemistry can occur.
Mass-radius relations and core-envelope decompositions of super-Earths and sub-Neptunes
Howe, Alex R.; Burrows, Adam [Department of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544 (United States); Verne, Wesley, E-mail: arhowe@astro.princeton.edu, E-mail: burrows@astro.princeton.edu [Department of Computer Science, Princeton University, Princeton, NJ 08544 (United States)
2014-06-01T23:59:59.000Z
Many exoplanets have been discovered with radii of 1-4 R {sub ?}, between that of Earth and Neptune. A number of these are known to have densities consistent with solid compositions, while others are 'sub-Neptunes' likely to have significant H{sub 2}-He envelopes. Future surveys will no doubt significantly expand these populations. In order to understand how the measured masses and radii of such planets can inform their structures and compositions, we construct models both for solid layered planets and for planets with solid cores and gaseous envelopes, exploring a range of core masses, H{sub 2}-He envelope masses, and associated envelope entropies. For planets in the super-Earth/sub-Neptune regime for which both radius and mass are measured, we estimate how each is partitioned into a solid core and gaseous envelope, associating a specific core mass and envelope mass with a given exoplanet. We perform this decomposition for both ''Earth-like'' rock-iron cores and pure ice cores, and find that the necessary gaseous envelope masses for this important sub-class of exoplanets must range very widely from zero to many Earth masses, even for a given core mass. This result bears importantly on exoplanet formation and envelope evaporation processes.
Jacox, M.B.
1995-05-20T23:59:59.000Z
The infrared spectra of reaction intermediates trapped in solid neon were studied in order to support the development of diagnostics for short-lived species which are reaction carriers in nitramine decomposition and combustion and to derive information about reactions which are important in the condensed-phase decomposition of nitramines. Nitromethane and monomethylnitramine were used as model compounds in these studies. Evidence was obtained for the formation of water complexes with both of these species. The results support the water-catalyzed decomposition mechanism for nitramines that was proposed by Melius. Studies of the photodecomposition of isotopically substituted monomethylnitramine demonstrate that four different groups of products are formed. Tentative spectral assignments are made for the aci-isomer of monomethylnitramine and for CH3NHONO. The final photodecomposition products are CH4, NO, CH3OH, and N20. Other studies have provided evidence for the formation of a weakly bonded complex of H2 with H20, as well as spectral data for the HCC free radical and for the H20+, N02+, NO(2-), and NO(3-), molecular ions.
Vasiliou, AnGayle K. [Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215 (United States); National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, Colorado 80401 (United States); Piech, Krzysztof M.; Reed, Beth; Ellison, G. Barney [Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215 (United States); Zhang Xu [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099 (United States); Nimlos, Mark R. [National Renewable Energy Laboratory, 1617 Cole Blvd., Golden, Colorado 80401 (United States); Ahmed, Musahid; Golan, Amir; Kostko, Oleg [Chemical Sciences Division, LBNL MS 6R-2100, Berkeley, California 94720 (United States); Osborn, David L. [Combustion Research Facility, Sandia National Laboratories, P.O. Box 969 MS 9055, Livermore, California 94551-0969 (United States); David, Donald E. [Integrated Instrument Design Facility, CIRES, University of Colorado, Boulder, Colorado 80309-0216 (United States); Urness, Kimberly N.; Daily, John W. [Center for Combustion and Environmental Research, Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, Colorado 80309-0427 (United States); Stanton, John F. [Institute for Theoretical Chemistry, Department of Chemistry, University of Texas, Austin, Texas 78712 (United States)
2012-10-28T23:59:59.000Z
A heated SiC microtubular reactor has been used to decompose acetaldehyde and its isotopomers (CH{sub 3}CDO, CD{sub 3}CHO, and CD{sub 3}CDO). The pyrolysis experiments are carried out by passing a dilute mixture of acetaldehyde (roughly 0.1%-1%) entrained in a stream of a buffer gas (either He or Ar) through a heated SiC reactor that is 2-3 cm long and 1 mm in diameter. Typical pressures in the reactor are 50-200 Torr with the SiC tube wall temperature in the range 1200-1900 K. Characteristic residence times in the reactor are 50-200 {mu}s after which the gas mixture emerges as a skimmed molecular beam at a pressure of approximately 10 {mu}Torr. The reactor has been modified so that both pulsed and continuous modes can be studied, and results from both flow regimes are presented. Using various detection methods (Fourier transform infrared spectroscopy and both fixed wavelength and tunable synchrotron radiation photoionization mass spectrometry), a number of products formed at early pyrolysis times (roughly 100-200 {mu}s) are identified: H, H{sub 2}, CH{sub 3}, CO, CH{sub 2}=CHOH, HC{identical_to}CH, H{sub 2}O, and CH{sub 2}=C=O; trace quantities of other species are also observed in some of the experiments. Pyrolysis of rare isotopomers of acetaldehyde produces characteristic isotopic signatures in the reaction products, which offers insight into reaction mechanisms that occur in the reactor. In particular, while the principal unimolecular processes appear to be radical decomposition CH{sub 3}CHO (+M) {yields} CH{sub 3}+ H + CO and isomerization of acetaldehyde to vinyl alcohol, it appears that the CH{sub 2}CO and HCCH are formed (perhaps exclusively) by bimolecular reactions, especially those involving hydrogen atom attacks.
Numerical solution to differential equations using Legendre Polynomials
Baggiano, Anthony Lincoln
1963-01-01T23:59:59.000Z
that was in = greement with the theoretical unpei!orbed model of Figure 1. A 4' x 4" x 4' water test secticn vas pcsiticned in the graphite fiHed ther mal cclimr:. of i the N. S. C. R. to obtair. essenti=lly 'i. pure thermal neutr-cr. flux ir. water. Graphite.... In the measurement of the flux perturbations, it was essential that the experiment be organized and designed to minimize errors due tc 1. chemical preparation of the foil solutions, 2. repositioning of the foils in the test. secticn and graphite loading, 3...
Axial clad strain behavior of sphere-pac fuel pins
Thomas, James Kelly
1986-01-01T23:59:59.000Z
rate than the cladding as pin power is increased. Additional fuel expansion r elative to the clad- ding may occur as a result of irradiation induced fuel growth and 24 I'ission gas swelling This is the driving mechanism for FCMI in ther mal reactor...'erences in the mechanical behav- ior of the alumina micr ospheres and actual spher e ? pac exist, the use of the alumina will ser ve to demonstrate the main mechanical beha- vior al tendencies of a packed particle bed. Additionally, the use of the alumina does not r...
On-nanowire spatial bandgap design for white light emission
Yang, Zongyin; Xu, Jinyou; Wang, Pan; Zhuang, Xiujuan; Pan, Anlian; Tong, Limin
2011-10-19T23:59:59.000Z
processes for full-composition (b) and tri-color (c) bandgap graded ZnCdSSe nanowires, respectively. Figure 1a shows the schematic setup for the growth of full-color bandgap graded ZnCdSSe alloy nanowires. A horizontal quartz tube (inner diameter 45 mm... in the untunable PL photometric properties of nanowires. The strategy in this experiment is to cool tube with a flow of air and fill the gap between substrate and tube with high ther- mal conductivity material. Low working temperature of CdSe source causes dilute...
Chan, Ho-Kai
1975-01-01T23:59:59.000Z
flow rate of the heat transfer fluid, a linear relationship can be obtained when the instantaneous efficiencv of the air heater is plotted against the rate of change of heater temperature per unit of the intensity of total solar radiation inci... solar radiation reaches the glazing, the "Fenwal" ther- mal switch is automatically closed, causing the pump to draw water from the tank and send it to the top of the floating-deck at the rate of 6. 0-6. 5 gallons per min- ute. The water forms a thin...
Martino, C.; King, W.; Ketusky, E.
2012-01-12T23:59:59.000Z
Savannah River National Laboratory conducted a series of tests on the Enhanced Chemical Cleaning (ECC) process using actual Savannah River Site waste material from Tanks 5F and 12H. Testing involved sludge dissolution with 2 wt% oxalic acid, the decomposition of the oxalates by ozonolysis (with and without the aid of ultraviolet light), the evaporation of water from the product, and tracking the concentrations of key components throughout the process. During ECC actual waste testing, the process was successful in decomposing oxalate to below the target levels without causing substantial physical or chemical changes in the product sludge.
Morris D. Argyle; John F. Ackerman; Suresh Muknahallipatna; Jerry C. Hamann; Stanislaw Legowski; Guibing Zhao; Sanil John
2006-09-30T23:59:59.000Z
The goal of this experimental project is to design and fabricate a reactor and membrane test cell to dissociate hydrogen sulfide (H{sub 2}S) in a non-thermal plasma and recover hydrogen (H{sub 2}) through a superpermeable multi-layer membrane. Superpermeability of hydrogen atoms (H) has been reported by some researchers using membranes made of Group V transition metals (niobium, tantalum, vanadium, and their alloys), although it has yet to be confirmed in this study. Several pulsed corona discharge (PCD) reactors have been fabricated and used to dissociate H{sub 2}S into hydrogen and sulfur. Visual observation shows that the corona is not uniform throughout the reactor. The corona is stronger near the top of the reactor in argon, while nitrogen and mixtures of argon or nitrogen with H{sub 2}S produce stronger coronas near the bottom of the reactor. Both of these effects appear to be explainable base on the different electron collision interactions with monatomic versus polyatomic gases. A series of experiments varying reactor operating parameters, including discharge capacitance, pulse frequency, and discharge voltage were performed while maintaining constant power input to the reactor. At constant reactor power input, low capacitance, high pulse frequency, and high voltage operation appear to provide the highest conversion and the highest energy efficiency for H{sub 2}S decomposition. Reaction rates and energy efficiency per H{sub 2}S molecule increase with increasing flow rate, although overall H{sub 2}S conversion decreases at constant power input. Voltage and current waveform analysis is ongoing to determine the fundamental operating characteristics of the reactors. A metal infiltrated porous ceramic membrane was prepared using vanadium as the metal and an alumina tube. Experiments with this type of membrane are continuing, but the results thus far have been consistent with those obtained in previous project years: plasma driven permeation or superpermeability has not been observed. A new test cell specially designed to test the membranes has been constructed to provide basic science data on superpermeability.
Oleg Meshcheryakov
2013-07-17T23:59:59.000Z
Even a single excess electron or ion migrating on the surface of sensitive explosives can catalyze their gradual exothermic decomposition. Mechanisms underlying such a charge-induced gradual thermal decomposition of highly sensitive explosives can be different. If sensitive explosive is a polar liquid, intense charge-dipole attraction between excess surface charges and surrounding explosive molecules can result in repetitive attempts of solvation of these charges by polar explosive molecules. Every attempt of such uncompleted nonequilibrium solvation causes local exothermic decomposition of thermolabile polar molecules accompanied by further thermal jumping unsolvated excess charges to new surface sites. Thus, ionized mobile hot spots emerge on charged explosive surface. Stochastic migration of ionized hot spots on explosive surface causes gradual exothermic decomposition of the whole mass of the polar explosive. The similar gradual charge-catalyzed exothermic decomposition of both polar and nonpolar highly sensitive explosives can be also caused by intense charge-dipole attacks of surrounding water vapor molecules electrostatically attracted from ambient humid air and strongly accelerated towards charged sites on explosive surfaces. Emission of electrons, photons and heat from ionized hot spots randomly migrating on charged surface of highly sensitive explosive aerosol nanoparticles converts such particles into the form of short-circuited thermionic nanobatteries.
Decomposition of Risk Functionals
Alois Pichler
2014-03-29T23:59:59.000Z
at a later time, the opposite relation holds almost surely. The extended ... International Institute for Applied Systems Analysis (IIASA), Laxenburg, Austria.
Decompositionality and identity
Takahashi, Shoichi, Ph. D. Massachusetts Institute of Technology
2006-01-01T23:59:59.000Z
The Scope of quantificational phrases (QPs) is often not represented in surface structures, in the sense that a constituent that is, on the surface, sister to a QP is not necessarily interpreted as its argument semantically. ...
Lucia M. Petkovic; Daniel M. Ginosar; Harry W. Rollins; Kyle C. Burch; Patrick J. Pinhero; Helen H. Farrell
2007-06-01T23:59:59.000Z
Production of hydrogen by splitting of water at lower temperatures than by direct thermal decomposition can be achieved by a series of particular chemical reactions that establish a thermochemical cycle [1]. Among the high number of thermochemical water-splitting cycles proposed in the literature [2], the sulfur-based group is of considerable interest. All the sulfur-based cycles employ the catalytic decomposition of sulfuric acid into SO2 and O2. The produced O2 corresponds to the O2 generated from water in the overall cycle. Research performed at the Idaho National Laboratory [3] has found that even one of the most stables catalysts, Pt supported on low surface area titania, deactivates with time on stream (TOS). To develop an understanding of the factors that cause catalyst deactivation, samples of 1% Pt supported on titania (rutile) catalyst were submitted to flowing concentrated sulfuric acid at 1123 K and atmospheric pressure for different TOSs between 0 and 548 h and a number of chemical and spectroscopic analyses applied to the spent samples.
Boyer, Edmond
-phase decomposition of propane : correlation with pyrocarbon deposition Cédric Descamps, Gerard L. Vignoles , Olivier : A chemical kinetic model for gas-phase pyrolysis of propane has been set up, partially reduced, and validated the notion of "maturation" from propane to lighter hydrocarbons, then to aromatic compounds and PAHs. The gas
Kim, Do Heui; Mudiyanselage, Kumudu K.; Szanyi, Janos; Kwak, Ja Hun; Zhu, Haiyang; Peden, Charles HF
2013-10-25T23:59:59.000Z
We have investigated nitrate formation and decomposition processes, and measured NOx storage performance on Pt-K2O/Al2O3 catalysts as a function of potassium loading. After NO2 adsorption at room temperature, ionic and bidentate nitrates were observed by fourier transform infra-red (FTIR) spectroscopy. The ratio of the former to the latter species increased with increasing potassium loading up to 10 wt%, and then stayed almost constant with additional K, demonstrating a clear dependence of loading on the morphology of the K species. Although both K2O(10)/Al2O3 and K2O(20)/Al2O3 samples have similar nitrate species after NO2 adsorption, the latter has more thermally stable nitrate species as evidenced by FTIR and NO2 temperature programmed desorption (TPD) results. With regard to NOx storage performance, the temperature of maximum NOx uptake (Tmax) is 573 K up to a potassium loading of 10 wt%. As the potassium loading increases from 10 wt% to 20 wt%, Tmax shifted from 573 K to 723 K. Moreover, the amount of NO uptake (38 cm3 NOx/g catal) at Tmax increased more than three times, indicating that efficiency of K in storing NOx is enhanced significantly at higher temperature, in good agreement with the NO2 TPD and FTIR results. Thus, a combination of characterization and NOx storage performance results demonstrates an unexpected effect of potassium loading on nitrate formation and decomposition processes; results important for developing Pt-K2O/Al2O3 for potential applications as high temperature NOx storage-reduction catalysts.
Rachid B. Slimane; Francis S. Lau; Javad Abbasian
2000-10-01T23:59:59.000Z
The objective of this program is to develop an economical process for hydrogen production, with no additional carbon dioxide emission, through the thermal decomposition of hydrogen sulfide (H{sub 2}S) in H{sub 2}S-rich waste streams to high-purity hydrogen and elemental sulfur. The novel feature of the process being developed is the superadiabatic combustion (SAC) of part of the H{sub 2}S in the waste stream to provide the thermal energy required for the decomposition reaction such that no additional energy is required. The program is divided into two phases. In Phase 1, detailed thermochemical and kinetic modeling of the SAC reactor with H{sub 2}S-rich fuel gas and air/enriched air feeds is undertaken to evaluate the effects of operating conditions on exit gas products and conversion efficiency, and to identify key process parameters. Preliminary modeling results are used as a basis to conduct a thorough evaluation of SAC process design options, including reactor configuration, operating conditions, and productivity-product separation schemes, with respect to potential product yields, thermal efficiency, capital and operating costs, and reliability, ultimately leading to the preparation of a design package and cost estimate for a bench-scale reactor testing system to be assembled and tested in Phase 2 of the program. A detailed parametric testing plan was also developed for process design optimization and model verification in Phase 2. During Phase 2 of this program, IGT, UIC, and industry advisors UOP and BP Amoco will validate the SAC concept through construction of the bench-scale unit and parametric testing. The computer model developed in Phase 1 will be updated with the experimental data and used in future scale-up efforts. The process design will be refined and the cost estimate updated. Market survey and assessment will continue so that a commercial demonstration project can be identified.
Florida, University of
, films from tetrakis (dimethylamido) titanium precursor onto InP A. Katz, A. Feingold, S. Nakahara, and SP, using a combined reactive chemistry of ammonia (NH,) gas and tetrakis (dimethylamido) titanium (DMATi to the preview RT-LPMOCVD TN, film deposited using only the DMATi precursor. I. INTRODUCTION Titanium nitride
Yuan, Bing; Yu, Zijun; Bernstein, Elliot R., E-mail: erb@lamar.Colostate.edu [Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872 (United States)
2014-02-21T23:59:59.000Z
Decomposition of the energetic material FOX-7 (1,1-diamino-2,2-dinitroethylene, C{sub 2}H{sub 4}N{sub 4}O{sub 4}) is investigated both theoretically and experimentally. The NO molecule is observed as an initial decomposition product subsequent to electronic excitation. The observed NO product is rotationally cold (<35 K) and vibrationally hot (2800 K). The initial decomposition mechanism is explored at the complete active space self-consistent field (CASSCF) level. Potential energy surface calculations at the CASSCF(12,8)/6-31G(d) level illustrate that conical intersections play an essential role in the decomposition mechanism. Electronically excited S{sub 2} FOX-7 can radiationlessly relax to lower electronic states through (S{sub 2}/S{sub 1}){sub CI} and (S{sub 1}/S{sub 0}){sub CI} conical intersections and undergo a nitro-nitrite isomerization to generate NO product on the S{sub 0} state. The theoretically predicted mechanism is consistent with the experimental results. As FOX-7 decomposes on the ground electronic state, thus, the vibrational energy of the NO product from FOX-7 is high. The observed rotational energy distribution for NO is consistent with the final transition state structure on the S{sub 0} state. Ground state FOX-7 decomposition agrees with previous work: the nitro-nitrite isomerization has the lowest average energy barrier, the C–NH{sub 2} bond cleavage is unlikely under the given excitation conditions, and HONO formation on the ground state surface is energy accessible but not the main process.
MalCoBox: Designing a 10 Gb/s Malware Collection Honeypot using Reconfigurable Technology
.muehlbach@cased.de Martin Brunner, Christopher Roblee Network Security and Early Warning Systems Fraunhofer@esa.cs.tu-darmstadt.de Abstract--Honeypots present networked computer systems with known security flaws to attackers and can serve¨uhlbach Secure Things Group Center for Advanced Security Research Darmstadt (CASED) sascha
GENERA[. VI1:\\\\ M I,OS ANGELES NORMAL MAL SCHOOL BUILDINGS AND GROUNDS
, June 27, 1907 #12;'WARD OF TRUSTEES GEORGE C. PARDEE, - - - - Governor of California };a Officio THOMAS /THOMAS R. CROSWELL , PH-D., Supervisor of Training School /SARAH P. MONKS , A.M., CURATOROlt MUSEUM, Zoology and Botany /HARRIET B. DUNN, SECRETARY OF FACULTY, History *AGNES ELLIOTT, History /FRED ALLISON
O professor do IST diz ser necessrio repensar o funcionamento das democracias Mal-estar europeu
Instituto de Sistemas e Robotica
financiamento das empresas, a atração do investimento, a melhor utilização das verbas do QREN, o uso mais, as biotecnologias, as ciências da saúde, as tecnologias da informação, a robótica, as nanotecnologias, as energias
LINEAR OP~lMAL CONTROL PRENTICE-HALLINTERNATIONAL,INC.,London
Moore, John Barratt
emphasis on those particular optimal control results having application to linear systems. It may therefore wcastle LINEAR OPTIMAL CONTROL PRENTICE-HALL, INC. Englewood Cliffs, New Jersey #12;Q 1971 by Prentice theory of Iinear systems within the broader framework of optimal control theory per se, it has been
MalStone: Towards A Benchmark for Analytics on Large Data Clouds
Grossman, Robert
Management]: Database Applications-- data mining; H.3.4 [Information Storage and Retrieval]: Systems 2010 ACM 978-1-4503-0055-110/07 ...$10.00. 1. INTRODUCTION Clouds based on the Hadoop system large data cloud architectures and systems. This can be difficult without standardized archi- tectures
Sutherland, J.W.; Patterson, P.M.; Klemm, R.B.
1992-02-01T23:59:59.000Z
The thermal decompositions of N{sub 2}O and CO{sub 2} was investigated by monitoring the kinetics of formation of O({sup 3}P) atoms in the reflected shock regime using atomic resonance absorption spectrophotometry (A.R.A.S.). The temperature range was 1805K to 2379K for N{sub 2}O and 2332K to 2869K for CO{sub 2}. Total densities were 3--4 {times} 10{sup 18} molecules cm{sup {minus}3} and hence the reported rate constants are at or near the low pressure limit for unimolecular decomposition. The results were expressed by the following Arrhenius equations: CO{sub 2} k(T) = (1.63 {plus_minus} 1.96) {times} 10{sup {minus}8} exp({minus}122565 {plus_minus} 5183/RT) cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} N{sub 2}O k(T) = (6.02 {plus_minus} 2.81) {times} 10{sup 10} exp({minus}53397 {plus_minus} 1865/RT) cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}. Uncertainties in the Arrhenius expressions are given at the one standard deviation level and the mean deviations of the experimental data from the respective expression are {plus_minus} 18.6% and {plus_minus} 30.7%. Corresponding values for the reverse reaction, k{sub rev}(CO{sub 2}) were computed from the expression k{sub for}/k{sub rev} = K{sub c}. The value obtained for k{sub rev}(CO{sub 2}) was (2.18 {plus_minus} 0.83) {times} 10{sup {minus}34} cm{sup 6} molecule{sup {minus}2} s{sup {minus}1}, independent of temperature from 2332K to 2869K. Preliminary results are also reported for the direct determination of the rate constant for the reaction, CO + O{sub 2} {yields} CO{sub 2} + O, from measurements of the initial rate of formation of O({sup 3}P) atoms. 35 refs., 9 figs., 4 tabs.
Sutherland, J.W.; Patterson, P.M.; Klemm, R.B.
1992-01-01T23:59:59.000Z
The thermal decompositions of N{sub 2}O and CO{sub 2} was investigated by monitoring the kinetics of formation of O({sup 3}P) atoms in the reflected shock regime using atomic resonance absorption spectrophotometry (A.R.A.S.). The temperature range was 1805K to 2379K for N{sub 2}O and 2332K to 2869K for CO{sub 2}. Total densities were 3--4 {times} 10{sup 18} molecules cm{sup {minus}3} and hence the reported rate constants are at or near the low pressure limit for unimolecular decomposition. The results were expressed by the following Arrhenius equations: CO{sub 2} k(T) = (1.63 {plus minus} 1.96) {times} 10{sup {minus}8} exp({minus}122565 {plus minus} 5183/RT) cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} N{sub 2}O k(T) = (6.02 {plus minus} 2.81) {times} 10{sup 10} exp({minus}53397 {plus minus} 1865/RT) cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}. Uncertainties in the Arrhenius expressions are given at the one standard deviation level and the mean deviations of the experimental data from the respective expression are {plus minus} 18.6% and {plus minus} 30.7%. Corresponding values for the reverse reaction, k{sub rev}(CO{sub 2}) were computed from the expression k{sub for}/k{sub rev} = K{sub c}. The value obtained for k{sub rev}(CO{sub 2}) was (2.18 {plus minus} 0.83) {times} 10{sup {minus}34} cm{sup 6} molecule{sup {minus}2} s{sup {minus}1}, independent of temperature from 2332K to 2869K. Preliminary results are also reported for the direct determination of the rate constant for the reaction, CO + O{sub 2} {yields} CO{sub 2} + O, from measurements of the initial rate of formation of O({sup 3}P) atoms. 35 refs., 9 figs., 4 tabs.
Iida, Daisuke, E-mail: dft0tfi16@meijo-u.ac.jp; Kawai, Syunsuke; Ema, Nobuaki; Tsuchiya, Takayoshi; Iwaya, Motoaki; Takeuchi, Tetsuya; Kamiyama, Satoshi [Faculty of Science and Technology, Meijo University, Nagoya 468-8502 (Japan); Akasaki, Isamu [Faculty of Science and Technology, Meijo University, Nagoya 468-8502 (Japan); Akasaki Research Center, Nagoya University, Nagoya 464-8603 (Japan)
2014-08-18T23:59:59.000Z
We developed a laser lift-off technique for a freestanding GaN substrate using an In droplet formed by thermal decomposition of GaInN. A combination of an In droplet formed by thermal decomposition of GaInN during growth and a pulsed second-harmonic neodymium-doped yttrium aluminum garnet laser (??=?532?nm) realized the lift-off GaN substrate. After laser lift-off of the GaN substrate, it was used to achieve 380?nm ultraviolet light-emitting diodes with light output enhanced 1.7-fold. In this way, the light extraction can be improved by removing the GaN substrate.
Sidler, Rolf, E-mail: rsidler@gmail.com [Center for Research of the Terrestrial Environment, University of Lausanne, CH-1015 Lausanne (Switzerland)] [Center for Research of the Terrestrial Environment, University of Lausanne, CH-1015 Lausanne (Switzerland); Carcione, José M. [Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42c, 34010 Sgonico, Trieste (Italy)] [Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42c, 34010 Sgonico, Trieste (Italy); Holliger, Klaus [Center for Research of the Terrestrial Environment, University of Lausanne, CH-1015 Lausanne (Switzerland)] [Center for Research of the Terrestrial Environment, University of Lausanne, CH-1015 Lausanne (Switzerland)
2013-02-15T23:59:59.000Z
We present a novel numerical approach for the comprehensive, flexible, and accurate simulation of poro-elastic wave propagation in 2D polar coordinates. An important application of this method and its extensions will be the modeling of complex seismic wave phenomena in fluid-filled boreholes, which represents a major, and as of yet largely unresolved, computational problem in exploration geophysics. In view of this, we consider a numerical mesh, which can be arbitrarily heterogeneous, consisting of two or more concentric rings representing the fluid in the center and the surrounding porous medium. The spatial discretization is based on a Chebyshev expansion in the radial direction and a Fourier expansion in the azimuthal direction and a Runge–Kutta integration scheme for the time evolution. A domain decomposition method is used to match the fluid–solid boundary conditions based on the method of characteristics. This multi-domain approach allows for significant reductions of the number of grid points in the azimuthal direction for the inner grid domain and thus for corresponding increases of the time step and enhancements of computational efficiency. The viability and accuracy of the proposed method has been rigorously tested and verified through comparisons with analytical solutions as well as with the results obtained with a corresponding, previously published, and independently benchmarked solution for 2D Cartesian coordinates. Finally, the proposed numerical solution also satisfies the reciprocity theorem, which indicates that the inherent singularity associated with the origin of the polar coordinate system is adequately handled.
Hokenek, Selma; Kuhn, John N. (USF)
2012-10-23T23:59:59.000Z
Monodisperse palladium particles of six distinct and controlled sizes between 4-16 nm were synthesized in a one-pot polyol process by varying the molar ratios of the two palladium precursors used, which contained palladium in different oxidation states. This difference permitted size control by regulation of the nucleation rate because low oxidation state metals ions nucleate quickly relative to high oxidation state ions. After immobilization of the Pd particles on silica by mild sonication, the catalysts were characterized by X-ray absorption spectroscopy and applied toward catalytic methanol decomposition. This reaction was determined as structure sensitive with the intrinsic activity (turnover frequency) increasing with increasing particle size. Moreover, observed catalytic deactivation was linked to product (carbon monoxide) poisoning. Co-feeding carbon dioxide caused the activity and the amount of deactivation to decrease substantially. A reaction mechanism based on the formation of the {pi}-bond between carbon and oxygen as the rate-limiting step is in agreement with antipathetic structure sensitivity and product poisoning by carbon monoxide.
Naoto Yokoyama; Masanori Takaoka
2014-12-09T23:59:59.000Z
A single-wavenumber representation of nonlinear energy spectrum, i.e., stretching energy spectrum is found in elastic-wave turbulence governed by the F\\"oppl-von K\\'arm\\'an (FvK) equation. The representation enables energy decomposition analysis in the wavenumber space, and analytical expressions of detailed energy budget in the nonlinear interactions are obtained for the first time in wave turbulence systems. We numerically solved the FvK equation and observed the following facts. Kinetic and bending energies are comparable with each other at large wavenumbers as the weak turbulence theory suggests. On the other hand, the stretching energy is larger than the bending energy at small wavenumbers, i.e., the nonlinearity is relatively strong. The strong correlation between a mode $a_{\\bm{k}}$ and its companion mode $a_{-\\bm{k}}$ is observed at the small wavenumbers. Energy transfer shows that the energy is input into the wave field through stretching-energy transfer at the small wavenumbers, and dissipated through the quartic part of kinetic-energy transfer at the large wavenumbers. A total-energy flux consistent with the energy conservation is calculated directly by using the analytical expression of the total-energy transfer, and the forward energy cascade is observed clearly.
de la Rue du Can, Stephane [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Hasanbeigi, Ali [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Sathaye, Jayant [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
2010-12-01T23:59:59.000Z
This report on the California Energy Balance version 2 (CALEB v2) database documents the latest update and improvements to CALEB version 1 (CALEB v1) and provides a complete picture of how energy is supplied and consumed in the State of California. The CALEB research team at Lawrence Berkeley National Laboratory (LBNL) performed the research and analysis described in this report. CALEB manages highly disaggregated data on energy supply, transformation, and end-use consumption for about 40 different energy commodities, from 1990 to 2008. This report describes in detail California's energy use from supply through end-use consumption as well as the data sources used. The report also analyzes trends in energy demand for the "Manufacturing" and "Building" sectors. Decomposition analysis of energy consumption combined with measures of the activity driving that consumption quantifies the effects of factors that shape energy consumption trends. The study finds that a decrease in energy intensity has had a very significant impact on reducing energy demand over the past 20 years. The largest impact can be observed in the industry sector where energy demand would have had increased by 358 trillion British thermal units (TBtu) if subsectoral energy intensities had remained at 1997 levels. Instead, energy demand actually decreased by 70 TBtu. In the "Building" sector, combined results from the "Service" and "Residential" subsectors suggest that energy demand would have increased by 264 TBtu (121 TBtu in the "Services" sector and 143 TBtu in the "Residential" sector) during the same period, 1997 to 2008. However, energy demand increased at a lesser rate, by only 162 TBtu (92 TBtu in the "Services" sector and 70 TBtu in the "Residential" sector). These energy intensity reductions can be indicative of energyefficiency improvements during the past 10 years. The research presented in this report provides a basis for developing an energy-efficiency performance index to measure progress over time in the State of California.
COUPLED CANONICAL POLYADIC DECOMPOSITIONS AND (COUPLED) DECOMPOSITIONS IN MULTILINEAR
applications in science and engineering, ranging from psychometrics, chemometrics, data mining, bioinformatics and Technology, KU Leuven - Kulak, E. Sabbelaan 53, 8500 Kortrijk, Belgium, KU Leuven, E.E. Dept. (ESAT IT Department, Kas- teelpark Arenberg 10, B-3001 Leuven-Heverlee, Belgium. {Mikael.Sorensen, Ignat
Ozone decomposition in water solutions
Hewes, Cecil Grayson
1969-01-01T23:59:59.000Z
OF LITERATUR 1V Vi ~ V111 III ~ EXPERIMENTAL SYSTEM AND ITS OPERATION 14 IV. DISCUSS10N OF RESULTS AND COiJCLUSION. . . 24 i~JOMENCLATUHE. BIBLIOGRAPIFY APPENDIX I. WASTE WATER REGENERATION BY OZONATION. II. AMINE REMOVAL BY OZONATION...ATER SOLUTIONS OF pH 8. XIII. REACTION RATE CONSTANTS FOR THE D'COMPOSITION OF OZONE IN INTER SOLUTIONS OF pH 8. XIV COD REMOVAL BY OZONE XV. OZONIZATION OF MATER CONTAINIiNG RESIDUAL AMINE. 57 60 LIST OF FIGURES FIGURE 1. FIOW DIAGRAM OF THZ...
PATH SPACE DECOMPOSITIONS FOR THE
of the ground state is 0 and thus it is much easier to ?nd the energy of the excited state, since ..... The price paid is the “loss” of a simple shift .... 12, 538 (1970).
Thermocatalytic decomposition of vulcanized rubber
Qin, Feng
2007-04-25T23:59:59.000Z
Used vulcanized rubber tires have caused serious trouble worldwide. Current disposal and recycling methods all have undesirable side effects, and they generally do not produce maximum benefits. A thermocatalytic process ...
Thermocatalytic decomposition of vulcanized rubber
Qin, Feng
2007-04-25T23:59:59.000Z
of the polymer at lower temperatures (non-pyrolysis conditions). Studies by Larsen et al. (41, 42) demonstrated that molten salt catalysts with Lewis acid properties, such as chloride, tin chloride, and antimony iodide, can decompose tire rubbers... described in the following paragraphs. Aluminum chloride, AlCl3, is a strong Lewis acid that can accept an electron pair acting as an acid during reaction (51). It is a hygroscopic white solid that reacts vigorously with moisture in air at room...
Numerical Irreducible Decomposition using PHCpack #
Sommese, Andrew J.
in several variables. # The authors gratefully acknowledge the support of this work by Volkswagen Stiftung
Deng, Yi
2014-11-24T23:59:59.000Z
DOE-GTRC-05596 11/24/2104 Collaborative Research: Process-Resolving Decomposition of the Global Temperature Response to Modes of Low Frequency Variability in a Changing Climate PI: Dr. Yi Deng (PI) School of Earth and Atmospheric Sciences Georgia Institute of Technology 404-385-1821, yi.deng@eas.gatech.edu El Niño-Southern Oscillation (ENSO) and Annular Modes (AMs) represent respectively the most important modes of low frequency variability in the tropical and extratropical circulations. The projection of future changes in the ENSO and AM variability, however, remains highly uncertain with the state-of-the-science climate models. This project conducted a process-resolving, quantitative evaluations of the ENSO and AM variability in the modern reanalysis observations and in climate model simulations. The goal is to identify and understand the sources of uncertainty and biases in models’ representation of ENSO and AM variability. Using a feedback analysis method originally formulated by one of the collaborative PIs, we partitioned the 3D atmospheric temperature anomalies and surface temperature anomalies associated with ENSO and AM variability into components linked to 1) radiation-related thermodynamic processes such as cloud and water vapor feedbacks, 2) local dynamical processes including convection and turbulent/diffusive energy transfer and 3) non-local dynamical processes such as the horizontal energy transport in the oceans and atmosphere. In the past 4 years, the research conducted at Georgia Tech under the support of this project has led to 15 peer-reviewed publications and 9 conference/workshop presentations. Two graduate students and one postdoctoral fellow also received research training through participating the project activities. This final technical report summarizes key scientific discoveries we made and provides also a list of all publications and conference presentations resulted from research activities at Georgia Tech. The main findings include: 1) the distinctly different roles played by atmospheric dynamical processes in establishing surface temperature response to ENSO at tropics and extratropics (i.e., atmospheric dynamics disperses energy out of tropics during ENSO warm events and modulate surface temperature at mid-, high-latitudes through controlling downward longwave radiation); 2) the representations of ENSO-related temperature response in climate models fail to converge at the process-level particularly over extratropics (i.e., models produce the right temperature responses to ENSO but with wrong reasons); 3) water vapor feedback contributes substantially to the temperature anomalies found over U.S. during different phases of the Northern Annular Mode (NAM), which adds new insight to the traditional picture that cold/warm advective processes are the main drivers of local temperature responses to the NAM; 4) the overall land surface temperature biases in the latest NCAR model (CESM1) are caused by biases in surface albedo while the surface temperature biases over ocean are related to multiple factors including biases in model albedo, cloud and oceanic dynamics, and the temperature biases over different ocean basins are also induced by different process biases. These results provide a detailed guidance for process-level model turning and improvement, and thus contribute directly to the overall goal of reducing model uncertainty in projecting future changes in the Earth’s climate system, especially in the ENSO and AM variability.
Short time proton dynamics in bulk ice and in porous anode solid oxide fuel cell materials
Basoli, Francesco [Università degli Studi di Roma Tor Vergata, Italy] [Università degli Studi di Roma Tor Vergata, Italy; Senesi, Roberto [ORNL] [ORNL; Kolesnikov, Alexander I [ORNL] [ORNL; Licoccia, Silvia [NAST Center, University of Roma "Tor Vergata"] [NAST Center, University of Roma "Tor Vergata"
2014-01-01T23:59:59.000Z
Oxygen reduction and incorporation into solid electrolytes and the reverse reaction of oxygen evolution play a cru-cial role in Solid Oxide Fuel Cell (SOFC) applications. However a detailed un derstanding of the kinetics of the cor-responding reactions, i.e. on reaction mechanisms, rate limiting steps, reaction paths, electrocatalytic role of materials, is still missing. These include a thorough characterization of the binding potentials experienced by protons in the lattice. We report results of Inelastic Neutron Scattering (INS) measurements of the vibrational state of the protons in Ni- YSZ highly porous composites (75% to 90% ), a ceramic-metal material showing a high electrical conductivity and ther mal stability, which is known to be most effectively used as anodes for solid ox ide fuel cells. The results are compared with INS and Deep Inelastic Neutron Scattering (DINS) experiments on the proton binding states in bulk ice.
Aparicio, Claudia, E-mail: claudia.aparicio@upol.cz; Filip, Jan, E-mail: claudia.aparicio@upol.cz; Mashlan, Miroslav, E-mail: claudia.aparicio@upol.cz; Zboril, Radek, E-mail: claudia.aparicio@upol.cz [Regional Centre of Advanced Technologies and Materials, Departments of Experimental Physics and Physical Chemistry, Faculty of Science, Palacky University, 17. listopadu 1192/12, 77146 Olomouc (Czech Republic)
2014-10-27T23:59:59.000Z
Thermally-induced reductive decomposition of natural iron-bearing garnets of the almandine-pyrope and almandine-spessartine series were studied at temperatures up to 1200 °C (heating rate of 10 °C/min) under atmosphere of forming gas (10% of H{sub 2} in N{sub 2}). Crystallochemical formula of the studied garnet was calculated as {sup VIII}(A{sub 3?x}Fe{sub x}{sup 2+}){sup VI}(Al,Fe{sup 3+}){sub 2}Si{sub 3}O{sub 12}, where the amount of Fe{sup 3+} in the octahedral sites is negligible with the exception of pyrope, A = Mg, Mn, and 0.47 ? x ? 2.85. The observed decomposition temperature, determined from differential scanning calorimetry and thermogravimetry, is greater than 1000 °C in all cases and showed almost linear dependence on the iron content in the dodecahedral sites of the studied garnets, with the exception of garnet with a near-pyrope composition (Prp{sub 80}Alm{sub 20}). The initial garnet samples and decomposition products were characterized in details by means of X-ray powder diffraction and {sup 57}Fe Mössbauer spectroscopy. We found that all studied garnets have common decomposition products such as metallic iron (in general, rounded particles below 4 ?m) and Fe-spinel; the other identified decomposition products depend on starting chemical composition of the garnet: Fe-cordierite, olivine (fayalite or tephroite), cristobalite, pyroxene (enstatite or pigeonite), and anorthite. Anorthite and pigeonite were only present in garnets with Ca in the dodecahedral site. All the identified phases were usually well crystallized.
Op%mal Scheduling of Combined Heat and Power (CHP) Plants1 under Time-sensi%ve Electricity Prices
Grossmann, Ignacio E.
. #12;Facing the challenge of variability, the power grid is in transi power grid. #12;Under-u%liza%on can be a opportunity for %ghter interac%ons with the power grid 4 Power Grid CHP plant Typically mul%ple boilers and turbines
Paru dans Nathalie Nabert (d.), Figures du Mal aux XIV et XV sicles, Paris, 1996, p. 187-210.
Paris-Sud XI, Université de
'hérésie cathare, le christianisme s'est toujours efforcé de se démarquer du dualisme, notamment en insistant sur
Einstein apaixonado: A cincia mal-contada de um mito bem-traado Carlos Alberto dos Santos
dos Santos, C.A.
. (...) A luz de junho explode através das janelas que dão para a Unionstrasse, no coração do lendário e "a nova teoria das ondas de luz de James Clerk Maxwell" e a controvérsia em torno da natureza da luz fazer com que os raios catódicos, isto é, os elétrons, fossem emitidos de um metal expondo-o à luz
Bueno, Marianne
2012-01-01T23:59:59.000Z
Richard R. Remembering the Alamo: Memory, Modernity & theR. Flores, Remembering the Alamo: Memory, Modernity, and theR. Flores, Remembering the Alamo: Memory, Modernity, and the
Uncloaking the Magician: Contributions of Comparative Psychology to Understanding Animal Training
Young, Robert J.
2002-01-01T23:59:59.000Z
cattle culture. Applied Ani- mal Ethology, 5, 174-186.written books about their ani- mal training methods so thatfor example, training ani- mals using social models.
Sondergaard, M.; Christensen, M.; Johnsen, S. [Center for Energy Materials, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus C (Denmark); Stiewe, C.; Dasgupta, T.; Mueller, E. [German Aerospace Center (DLR), Linder Hoehe, DE-51147 Cologne (Germany); Iversen, B.B., E-mail: bo@chem.au.d [Center for Energy Materials, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus C (Denmark)
2011-05-15T23:59:59.000Z
Three samples of Pb{sub 0.9-x}Sn{sub 0.1}Ge{sub x}Te with x=0.25, 0.35, 0.6 were prepared by heating the mixtures above the melting point of the constituent elements followed by quenching in water. The x=0.6 sample is close to the center of the immiscibility region, while the x=0.25 and 0.35 samples are in the Pb rich region inside the spinodal miscibility gap. Microstructural investigations using Powder X-ray Diffraction, Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy revealed both GeTe-rich and PbTe-rich phases. The samples were uniaxially hot pressed and the thermoelectric properties were characterized in the temperature range 2-400 K using a commercial apparatus and from 300 to 650 K with a custom designed setup. The best sample (x=0.6) reached zT{approx}0.6 at 650 K, while the x=0.25 and 0.35 samples showed thermal instability at elevated temperatures. -- Graphical abstract: Spinodal decomposition in the GeTe-SnTe-PbTe system demonstrated by SEM and EXS images. Display Omitted Highlights: {yields} Investigation of Pb-rich part of the spinodal miscibility gap in PbTe-SnTe-GeTe. {yields} zT=0.6 at 650 K reproduced for Pb{sub 0.3}Sn{sub 0.1}Ge{sub 0.6}Te. {yields} Pb-rich phases shown to be thermally instable. {yields} Thermoelectric property characterization at low and high temperature. {yields} Microstructural investigations using PXRD, SEM, EDX and PSM.
Jones, W.M.; Bowman, M.G.
1982-01-01T23:59:59.000Z
The concept of utilizing oxide decompositions in advanced thermochemical hydrogen cycles for solar heat sources is introduced. It has particular interest in allowing direct transmission of energy to the process through an air window. A cycle for the Co/sub 3/O/sub 4/-CoO pair would be, schematically: (1) Co/sub 3/O/sub 4/ = 3CoO + 1/2 O/sub 2/; (2) I/sub 2/(s,1) + Mg(OH)/sub 2/ + 3CoO = MgI/sub 2/(aq) + Co/sub 3/O/sub 4/ + H/sub 2/O(1); (3) H/sub 2/O + MgI/sub 2/(aq) = MgO + 2HI; (4) 2 HI = H/sub 2/ + I/sub 2/; (5) MgO + H/sub 2/O = Mg(OH)/sub 2/. Reaction (2) should give a high concentration of MgI/sub 2/ that would be favorable for (3). The solutions would also contain iodine dissolved as polyiodide, partly offsetting this advantage. Preliminary results indicate that reaction (2) is slow at 150/sup 0/C. It is surmised that the mechanism of (2) consists of the iodine disproportionation reaction (6), followed by reaction (7). (6) I/sub 2/(s,1) + Mg(OH)/sub 2/ = 5/6 MgI/sub 2/(aq) + 1/6 Mg(IO/sub 3/)/sub 2/(aq) + H/sub 2/O(1); (7) 1/6 Mg(IO/sub 3/)/sub 2/(aq) + 3 CoO = 1/6 MgI/sub 2/(aq) + Co/sub 3/O/sub 4/. Other workers have found (6) to be relatively fast and with a good yield at 150/sup 0/C. We have found the independently studied reaction (7) to be sufficiently slow at 150/sup 0/C to account for the slowness of (2). The yield of (7) was found to be proportional to the square root of the time, which suggests that iodate must diffuse through an adherent, accumulating Co/sub 3/O/sub 4/ layer. Since (7) is much faster when Mg(IO/sub 3/)/sub 2/ is replaced by KIO/sub 3/, the Mg/sup 2 +/ ion may catalyze formation of an adherent Co/sub 3/O/sub 4/ spinel layer. The reactivity of CoO in the KIO/sub 3/ analog of (7) is greatly decreased by exposure to high temperature.
Model combination by decomposition and aggregation
Xu, Mingyang, 1974-
2004-01-01T23:59:59.000Z
This thesis focuses on a general problem in statistical modeling, namely model combination. It proposes a novel feature-based model combination method to improve model accuracy and reduce model uncertainty. In this method, ...
Emergent properties of heterogeneous decomposition networks
Forney, David C., III
2012-01-01T23:59:59.000Z
Organic matter respiration in natural ecosystems is controlled by a network of biologically, physically, and chemically driven processes. Often it is important to estimate total carbon flux from a degradation system or the ...
Optimization Online - A PARALLEL interior point decomposition ...
Kartik Krishnan Sivaramakrishnan
2006-12-04T23:59:59.000Z
Dec 4, 2006 ... ... and decomposed and distributed subproblems (smaller SDPs) in a parallel and distributed high performance computing environment.
Robust Critical Node Selection by Benders Decomposition
2014-01-28T23:59:59.000Z
Another application arises in health-care particularly in virus immunization where limited immunization resources are to be distributed. The goal is to identify the ...
Innovative Methodology Decomposition of Surface EMG Signals
De Luca, Carlo J.
for decomposing surface electromyographic (sEMG) signals into the constituent motor unit (MU) action potential limb muscles. I N T R O D U C T I O N The electromyographic (EMG) signal is composed of the action
Distributed Prognostics Based on Structural Model Decomposition
Daigle, Matthew
efficiency. Using a centrifugal pump as a case study, we perform a number of simulation-based experiments or probability Q volumetric flow T temperature r friction coefficient w wear parameter M model/submodel v
Approximate convex decomposition and its applications
Lien, Jyh-Ming
2009-05-15T23:59:59.000Z
Approved by: Chair of Committee, Nancy M. Amato Committee Members, Ergun Akleman Ricardo Gutierrez-Osuna Donald H. House John C. Keyser Head of Department, Valerie E. Taylor December 2006 Major Subject: Computer Science iii ABSTRACT Approximate Convex...-Yen Li, for teaching me about research. I would like to thank my committee members, John Keyser, Donald House, Ergun Akleman, and Ricardo Gutierrez-Osuna, who supported me through this challenging journey. I would like to thank everyone in the Algorithms...
22 November 2012 ISE Department's Index Decomposition
Chaudhuri, Sanjay
in energy consumption and to track economy-wide energy efficiency trends. It is also a technique developed and Renewable Energy of the United States to study US energy intensity trends. The technique has also been used internationally IN September, New Zealand released its "Changes in Energy Use: New Zealand 1990-2011" document
Research Article Decomposition of Epoxy Model Compounds
Guo, John Zhanhu
on chemical recycling of plastics using SCW and NCW has also been conducted. It was found that the condensation polymers, i.e., polyurethane, Nylon 6, and polycarbonates, Chem. Eng. Technol. 2013, 36, No. 12
A DECOMPOSITION-BASED PSEUDOAPPROXIMATION ALGORITHM
Krumke, Sven O.
Burch College of St Benedict and St John's University cburch@csbsju.edu Robert Carr Sandia National Department of Energy under contract DE-AC04-94AL85000. 1 #12;2 Eric Sundberg¶ Rutgers University sundberg
Proper Orthogonal Decomposition for Flow Calculations
North Carolina State University Raleigh, NC 276958205 USA March 23, 1998 Abstract Proper orthogonal with the energy and the species equa tions. In addition, we also examined the feasibility and efficiency of POD method in the optimal control of the source vapors to obtain the most uniform deposition profile
Thermal Decomposition of Nitrated Tributyl Phosphate
Paddleford, D.F. [Westinghouse Savannah River Company, Aiken, SC (United States); Hou, Y.; Barefield, E.K.; Tedder, D.W.; Abdel-Khalik, S.I. [Georgia Institute of Technology, GA (United States)
1995-01-01T23:59:59.000Z
Contact between tributyl phosphate and aqueous solutions of nitric acid and/or heavy metal nitrate salts at elevated temperatures can lead to exothermic reactions of explosive violence. Even though such operations have been routinely performed safely for decades as an intrinsic part of the Purex separation processes, several so-called ``red oil`` explosions are known to have occurred in the United States, Canada, and the former Soviet Union. The most recent red oil explosion occurred at the Tomsk-7 separations facility in Siberia, in April 1993. That explosion destroyed part of the unreinforced masonry walls of the canyon-type building in which the process was housed, and allowed the release of a significant quantity of radioactive material.
Nonserial dynamic programming and local decomposition ...
2006-03-23T23:59:59.000Z
every assignment to x2 and x3, compute the value of x1 for which: h1(x2,x3) .... Consider the integer linear programming problem Z with binary variables: z = cT x ...
Optimization Online - Decomposition theorems for linear programs
Jean-Bertrand Gauthier
2014-10-08T23:59:59.000Z
Oct 8, 2014 ... While it is the crucial component of the analysis, the heart of the algorithm is the residual network upon which are derived two theorems that ...
Wavelet-Vaguelette Decompositions and Homogeneous Equations
1997-12-12T23:59:59.000Z
definition, see Chapter 3) of functions to have a wavelet-vaguelette system. ... where parameters ? and ?0 are determined from our analysis, leads to a ...... it suffices to consider the right hand side of (8.3) to control the error between fm ...... With the assumption that the true intensity field f of the digital ..... Design, 9 (1992)
Empirical Mode Decomposition Analysis for Visual Stylometry
Ding, Wandi
(1525-1569) and a set of works attributed to Dutch master Rembrandt van Rijn (1606- 1669) and his pupils
Separable Approximations and Decomposition Methods for the ...
2013-08-30T23:59:59.000Z
Aug 30, 2013 ... chrift der Naturforschenden Gesellschaft in Zürich, 15:272–286, 1870. [31] Shai Shalev-Shwartz and Ambuj Tewari. Stochastic methods for l1 ...
Gaseous Decomposition Products of Safety Powders
Cubbison, C.E.
1912-01-01T23:59:59.000Z
o f ca rbon d i o x i d e Oxygen p r e s e n t Buret te r ead ing com. 58.0 58.0 I I . I 67.1 78.2 68.0 10.2 64.4 Per c en t . 75.0 - 58.0 = 17.d 68.0 — 6 4 . 4 = 3.6 Excess . A§tm " C " C o a l Powder . Gases As a n a l y z e d... t h t h i s i s a I i nch h o l e d r i l l e d t o a depth o f 5 l /4 inches.A c i r c u l a r b rass washer i s m o r t i s e d i n between the base o f the th r eads and the one inch chamber. A tapped p lug out frmm a two inch bar f i t s the l...
Decomposition of radiational effects of model feedbacks
Ellsaesser, H.W.; MacCracken, M.C.; Potter, G.L.; Mitchell, C.S.
1981-08-01T23:59:59.000Z
Three separate doubled CO/sub 2/ experiments with the statistical dynamic model are used to illustrate efforts to study the climate dynamics, feedbacks, and interrelationships of meteorological parameters by decomposing and isolating their individual effects on radiation transport.
Decomposition Techniques for Learning Graphical Models
Refaat, Khaled
2015-01-01T23:59:59.000Z
Workshop on Artificial Intelligence and Statistics, pp. 112–Lectures on Artificial Intelligence and Machine Learning.on Uncertainty in Artificial Intelligence. Thiesson, B. ,
Dynamic Mode Decomposition: Theory and Applications
Rowley, Clarence W.
to investigate the source of low-frequency oscillations in shock-turbulent boundary layer interactions. Using also apply DMD to analyze oscillatory fluid flows, which is its most common use. In one example, we is characterized by frequency lock-on between the wake and the shear layer. In another example, we use DMD
Interactive simulation of fire, burn and decomposition
Melek, Zeki
2009-05-15T23:59:59.000Z
. . . . . . . . . . . . . . . . . . . . . . 86 35 Simulation control in action. . . . . . . . . . . . . . . . . . . . . . . . 89 36 Burning a log and a Siggraph logo. . . . . . . . . . . . . . . . . . . . 95 37 Two sets of quadrilateral stacks are used for different camera angles. 97 38...
Interactive simulation of fire, burn and decomposition
Melek, Zeki
2008-10-10T23:59:59.000Z
. . . . . . . . . . . . . . . . . . . . . . 86 35 Simulation control in action. . . . . . . . . . . . . . . . . . . . . . . . 89 36 Burning a log and a Siggraph logo. . . . . . . . . . . . . . . . . . . . 95 37 Two sets of quadrilateral stacks are used for different camera angles. 97 38...
Learning inverse kinematics via crosspoint function decomposition
Torras, Carme
industrial robots, that greatly reduces the number of movements needed to learn or relearn the IK to a given
Partitioning strategies: Spatiotemporal patterns of program decomposition
Hoffmann, Henry Christian
We describe four partitioning strategies, or patterns, used to decompose a serial application into multiple concurrently executing parts. These partitioning strategies augment the commonly used task and data parallel ...
DECOMPOSITION OF LARGE-SCALE STOCHASTIC OPTIMAL ...
2009-03-06T23:59:59.000Z
consider dynamical systems that can be divided into small-scale independent .... realizations of the noise process are identical up to time t, then the same ..... without our approximation, the algorithm would build primal iterates that converge ...
Decomposition Methods for Large Scale LP Decoding
2012-04-02T23:59:59.000Z
that have extreme reliability requirements. While suitably ...... parity-check codes. Electronic Notes in Theoretical Computer Science, 74(0):97–104, 2003.
Spatial variation decomposition via sparse regression
Zhang, Wangyang
In this paper, we briefly discuss the recent development of a novel sparse regression technique that aims to accurately decompose process variation into two different components: (1) spatially correlated variation, and (2) ...
MULTIFRACTAL DECOMPOSITIONS OF DIGRAPH RECURSIVE FRACTALS
Edgar, Gerald
FRACTALS G. A. Edgar and R. Daniel Mauldin The Ohio State University 1 #12;2 G. A. EDGAR AND R. DANIEL MAULDIN 5. Other Remarks
Functional composition and decomposition for signal processing
Demirtas, Sefa
2014-01-01T23:59:59.000Z
Functional composition, the application of one function to the results of another function, has a long history in the mathematics community, particularly in the context of polynomials and rational functions. This thesis ...
Hepatic fatty acid and cholesterol metabolism in nephrotic syndrome
Han, Seungyeup; Vaziri, Nosratola D; Gollapudi, Pavan; Kwok, Vincent; Moradi, Hamid
2013-01-01T23:59:59.000Z
In addition, the NS ani- mals had increased plasmain the liver tissue of nephrotic ani- mals. The underlying
Timing Behavior and Development: Comments on Some Animal and Human Data
Lejeune, Helga; Richelle, Marc
1990-01-01T23:59:59.000Z
from those used with other ani- mals. These procedures,the scalloped pattern of ani- mals. The second criterion,
Bernatchez, Louis
´decine, Que´bec, Que´bec, Canada G1V 0A6 2 Institut de Biologie Inte´grative et des Syste`mes (IBIS), Universite´ Laval, Pavillon Charles-Euge`ne-Marchand, Que´bec, Que´bec, Canada G1V 0A6 3 Department'Environnement, de la Faune et des Parcs du Que´bec, 880 chemin Sainte-Foy, Que´bec, Que´bec, Canada G1S 4X4
Barthelat, Francois
and well-being, of economic prosperity, and of change --in Quebec, for Quebecers. PUBLICATION: Office Building, Room 519 Montreal, Quebec H3A 0G4 Canada info.communications@mcgill.ca www 1,000 hectares of natural primeval forests. McGill and Quebec 2 Health and aging 4 Public
N J I T M A G A Z I N E | S P R I N G 2 0 1 2 1 7 mal & friendS
Gary, Dale E.
on projects such as port facilities, breakwaters, deepwater oil- drilling platforms and offshore oil fields
Anti-cancer drugs elicit re-expression of UDP-glucuronosyltransferases in melanoma cells.
Dellinger, Ryan W; Matundan, Harry H; Ahmed, Amelia S; Duong, Priscilla H; Meyskens, Frank L Jr
2012-01-01T23:59:59.000Z
changes induced by resveratrol in human melanoma. Molwhich is inhibited by resveratrol. Mol Cancer Ther 7: 3751–
Anti-Cancer Drugs Elicit Re-Expression of UDP-Glucuronosyltransferases in Melanoma Cells
Dellinger, Ryan W; Matundan, Harry H; Ahmed, Amelia S; Duong, Priscilla H; Meyskens, Frank L; Smalley, Keiran
2012-01-01T23:59:59.000Z
changes induced by resveratrol in human melanoma. Molwhich is inhibited by resveratrol. Mol Cancer Ther 7: 3751–
Current drive in recombining plasma P. F. Schmit and N. J. Fisch
-variation on wave-particle processes in the plasma. Time variation in nei- ther the application of rf power nor
Volume13.Issue2Summer2000.ISSN1044-5536 Introduction
permits investigation of both ionic and non-dipolar molecules, nei- ther of which are generally accessible
El Ni~no and La Ni~na: Causes and Global Consequences Michael J McPhaden
~no, which was nei- ther predicted nor even detected until nearly at its peak, a 10-year international
Krysl, P; Cranford, T W; Wiggins, S M; Hildebrand, John A
2006-01-01T23:59:59.000Z
impedance mismatch within this ani- mal. To construct anwith respect to the ani- mal, with an exponential ramp upfactors determined by the ani- mal during a dive cycle. With
2012-01-01T23:59:59.000Z
to 20 copies/ml when the ani- mal was euthanized at 41 weeks45–207 of SIV infection), this ani- mal developed a gradualviral RNA in the tonsil of ani- mal 32186 revealed a pure
In vitro gas production provides effective method for assessing ruminant feeds
Getachew, Girma; DePeters, Edward J.; Robinson, Peter H.
2004-01-01T23:59:59.000Z
in numerous experiments. Ani- mal experiments will continuevalue of ruminant feeds. Ani- mal Feed Sci Technol 102:169–value, or energy content, of an ani- mal feed is determined
Mast cells in a murine lung ischemia-reperfusion model of primary graft dysfunction
2014-01-01T23:59:59.000Z
when compared to wild-type ani- mals as manifested by graftdifference in wild-type ani- mals with and without mast
Kenneth S. Norris: Naturalist, Cetologist & Conservationist, 1924-1998: An Oral History Biography
Reti, Irene H.
1999-01-01T23:59:59.000Z
interested in describing the ani- mals he saw in a system,arguments about how, why, ani- mals behaved the way they
Russian Regional Flags: Flags of the Subjects of the Russian Federation
Platoff, Anne M.
2009-01-01T23:59:59.000Z
of the flags have wild ani- mals—five have lions, three havedown from the clouds toward the ani- mal, strengthening its
Domain decomposition preconditioners for higher-order discontinuous Galerkin discretizations
Diosady, Laslo Tibor
2012-01-01T23:59:59.000Z
Aerodynamic flows involve features with a wide range of spatial and temporal scales which need to be resolved in order to accurately predict desired engineering quantities. While computational fluid dynamics (CFD) has ...
Information processing with longitudinal spectral decomposition of ultrashort pulses
Saperstein, Robert Elliot
2007-01-01T23:59:59.000Z
Photonics) by Robert Elliot Saperstein Committee in charge:K. L. Yu Copyright Robert Elliot Saperstein, 2007 All rightsThe Dissertation of Robert Elliot Saperstein is approved,
Ketone Production from the Thermal Decomposition of Carboxylate Salts
Landoll, Michael 1984-
2012-08-15T23:59:59.000Z
The MixAlco process uses an anaerobic, mixed-culture fermentation to convert lignocellulosic biomass to carboxylate salts. The fermentation broth must be clarified so that only carboxylate salts, water, and minimal impurities remain. Carboxylate...
Optimization Decomposition of Resistive Power Networks with Energy Storage
Tan, Chee Wei
, Senior Member, IEEE Abstract--A fundamental challenge of a smart grid is: to what extent can moving, smart grid, message passing algorithm. I. INTRODUCTION A key challenge in a smart grid design of demands and supply generation (see Figure 1), while promising in a smart grid, motivates the important
Gallego Arrubla, Julian Andres
2013-07-25T23:59:59.000Z
for systems of inequalities with binary variables are developed. The first algorithm uses the new theory and the method of the alternative polyhedron within a branch-and-bound (BAB) approach. The second algorithm applies the new theory and the method...
Integrated boiler, superheater, and decomposer for sulfuric acid decomposition
Moore, Robert (Edgewood, NM); Pickard, Paul S. (Albuquerque, NM); Parma, Jr., Edward J. (Albuquerque, NM); Vernon, Milton E. (Albuquerque, NM); Gelbard, Fred (Albuquerque, NM); Lenard, Roger X. (Edgewood, NM)
2010-01-12T23:59:59.000Z
A method and apparatus, constructed of ceramics and other corrosion resistant materials, for decomposing sulfuric acid into sulfur dioxide, oxygen and water using an integrated boiler, superheater, and decomposer unit comprising a bayonet-type, dual-tube, counter-flow heat exchanger with a catalytic insert and a central baffle to increase recuperation efficiency.
Continuous decomposition of quantum measurements via Hamiltonian feedback
Jan Florjanczyk; Todd A. Brun
2015-04-15T23:59:59.000Z
We characterize the set of generalized quantum measurements that can be decomposed into a continuous measurement process using a stream of probe qubits and a tunable interaction Hamilto- nian. Each probe in the stream interacts weakly with the target quantum system, then is measured projectively in a standard basis. This measurement result is used in a closed feedback loop to tune the interaction Hamiltonian for the next probe. The resulting evolution is a stochastic process with the structure of a one-dimensional random walk. To maintain this structure, and require that at long times the measurement outcomes be independent of the path, the allowed interaction Hamil- tonians must lie in a restricted set, such that the Hamiltonian terms on the target system form a finite dimensional Jordan algebra. This algebraic structure of the interaction Hamiltonians yields a large class of generalized measurements that can be continuously performed by our scheme, and we fully describe this set.
SoilLitter Mixing Accelerates Decomposition in a Chihuahuan
of Geography, University of California Los Angeles, 1255 Bunche Hall, Box 951524, Los Angeles, California 90095 the study; DH and RM performed the research and analyzed the data; DH, HT, SA, and RM wrote the paper that of mesic systems, where simple models based on climate variables such as actual evapotranspiration predict
Audio sparse decompositions in parallel Let the greed be shared !
Paris 7 - Denis Diderot, Université
by absolute de- caying order, one observes a fast decay, typically a power law with some large negative harmonics of the musical content. With a smart quantization of these few large transform coefficients Abstract--Greedy methods are often the only practical way of solving very large sparse approximation
Parallel Sparse Modi ed Gram-Schmidt QR Decomposition ?
TouriÃ±o, Juan
cx=0; cxcx++) f Obtain px, cx #20; px , such that norm px = max cx#20;jcx; break; g else swap (norm cx ; col cx of M and R), (norm px ; col px of M and R); (4) r cx cx = p norm cx ; (5) for (i=0; i
A scenario decomposition algorithm for 0-1 stochastic programs
2013-06-26T23:59:59.000Z
Jun 26, 2013 ... ... and impose a time limit of 5000 seconds. All computations are done using the boyle cluster in the ISyE High Performance Computing Facility.
Evaluation of Parallel Decomposition Methods for Biomechanical Optimizations
George, Alan D.
that parallelizes the analysis function (i.e., a kinematic or dynamic simulation) called repeatedly by the optimizer , Jeffrey A. Reinbolt2,3 , Benjamin J. Fregly2,3 , and Alan D. George1 1 Department of Electrical & Computer
Decomposition algorithms for multi-area power system analysis
Min, Liang
2007-09-17T23:59:59.000Z
A power system with multiple interconnected areas needs to be operated coordinately for the purposes of the system reliability and economic operation, although each area has its own ISO under the market environment. In consolidation of different...
Multiagent planning and learning using random decompositions and adaptive representations
Üre, Nazim Kemal
2015-01-01T23:59:59.000Z
Multiagent planning problems are ubiquitous in engineering. Applications range from control of robotic missions and manufacturing processes to resource allocation and traffic monitoring problems. A common theme in all of ...
In uence-Based Model Decomposition Christopher Bailey-Kellogg
Bailey-Kellogg, Chris
building temperature (smart buildings) to ve- hicle on-board diagnostic and control systems that in- cessing technology have enabled a new generation of AI robotic systems | so-called Smart Matter systems of these Smart Matter systems is to synthesize optimal control policies using data rich models for the systems
A stochastic ordering based on a decomposition of Kendall's tau
Maume-Deschamps, Véronique
, it is shown to be weaker than the association ordering of Schriever (1987) under weak regularity conditions. 1, but that it is weaker than the association ordering of Schriever (1987). A short discussion concludes the paper. 2
Methane Decomposition: Production of Hydrogen and Carbon Filaments
Goodman, Wayne
hydrogen production include autothermal reforming and partial oxidation. However, all these processes and auto-thermal reforming also entail similar procedures for COx removal. Removal of COx to ppm levels
Spacial and objective decompositions for very large SCAPs
Bent, Russell W [Los Alamos National Laboratory; Van Hentenryck, Pascal [BROWN UNIV.; Coffrin, Carleton [BROWN UNIV.
2010-01-01T23:59:59.000Z
This paper considers the single commodity allocation problem (SCAP) for disaster recovery, a fundamental problem faced by all populated areas. SCAPs are complex stochastic optimization problems that combine resource allocation, warehouse routing, and parallel fleet routing. Moreover, these problems must be solved under tight run-time constraints to be practical in real-world disaster situations. This paper revisits the SCAP algorithm proposed in and proposes new storage allocation models that are necessary to enable the algorithm to scale to problem sizes of three orders of magnitude greater (250, 500, 1000 storage locations). The new algorithms are validated on large-scale hurricane disaster scenarios generated by Los Alamos National Laboratory using state-of-the-art disaster simulation tools.
Model-based planning through constraint and causal order decomposition
Chung, Seung H. (Seung Hwa), 1975-
2008-01-01T23:59:59.000Z
One of the major challenges in autonomous planning and sequencing is the theoretical complexity of planning problems. Even a simple STRIPS planning problem is PSPACEcomplete, and depending on the expressivity of the planning ...
On the Error in the Product QR Decomposition
Van Vleck, Erik
2010-03-17T23:59:59.000Z
for sequences of matrices by ?{Vk}?k=1? = supk ?Vk?F , we have ?? ?1G(x 0 )? ? ? for G defined in (3.1) and (3.2), ? defined in (4.9), (4.10), and (4.11), x 0 = {I}?k=1, and ? given in (4.2). Proof. To determine this bound, we consider the linear system ?V = G(x... ?Vn+1?F = sup n ? 2 ? ? m?1 ? j=1 m ? i=j+1 (Vn+1) 2 ji ? ? 1/2 (4.16) ? ? 2 ? ? m?1 ? j=1 m ? i=j+1 ( ?ij |Eij | Rjj ) 2 ? ? 1/2 . 4.3. Bounds on ???1G?(x 0 ) ? I?. We next prove the following lemma to obtain the bound ? on ???1G?(x 0 )? I? given...
PRODUCTION OF HYDROGEN BY SUPERADIABATIC DECOMPOSITION OF HYDROGEN SULFIDE
NREL/CP-610-32405 #12;As a logical extension of our ongoing process development efforts, GTI plans concentrated mainly on the superadiabatic reactor, and has comprised computational modeling and experimental concept, using H2S-N2-O2 gas mixtures. Theoretical (numerical modeling) studies at UIC and collaborative
Domain Decomposition Preconditioning for High Order Hybrid Discontinuous Galerkin Methods
Schoeberl, Joachim
for elliptic problems [4, 12, 24]. The motivation might be to have dominant convection, or one wants to build. With this result condition number estimates follow with the usual techniques. 1 #12;The main difficulty is to build operators which are motivated by the multiplication with low-energy functions of Pavarino and Widlund
Finding analogies in semantic networks using the singular value decomposition
Krishnamurthy, Jayant (Jayant S.)
2009-01-01T23:59:59.000Z
We present CROSSBRIDGE, an algorithm for finding analogies in large, sparse semantic networks. We treat analogies as comparisons between domains of knowledge. A domain is a small semantic network, i.e., a set of concepts ...
Method for increasing steam decomposition in a coal gasification process
Wilson, M.W.
1987-03-23T23:59:59.000Z
The gasification of coal in the presence of steam and oxygen is significantly enhanced by introducing a thermochemical water- splitting agent such as sulfuric acid, into the gasifier for decomposing the steam to provide additional oxygen and hydrogen usable in the gasification process for the combustion of the coal and enrichment of the gaseous gasification products. The addition of the water-splitting agent into the gasifier also allows for the operation of the reactor at a lower temperature.
Singular-value decomposition of a tomosynthesis system
Dainty, Chris
1967 (2009). 3. L. T. Niklason, "Digital tomosynthesis in breast imaging," Radiology 1997, 399406 (1997). 4Nova University Center, SE-10691Stockholm, Sweden 2College of Optical Sciences and Dept. of Radiology Univ to replace mammography, since it gives 3D information at a relatively small increase in dose and cost. We
Computation and Uses of the Semidiscrete Matrix Decomposition
O'Leary, Dianne P.
Laboratories and Dianne P. O'Leary University of Maryland We derive algorithms for computing a semidiscrete Energy Research Corporation. O'Leary's work was supported by the National Sci ence Foundation under 945519214, tgkolda@sandia.gov. Name: Dianne P. O'Leary Address: Computer Science Department
Algorithm 805: Computation and Uses of the Semidiscrete Matrix Decomposition
O'Leary, Dianne P.
National Laboratories and DIANNE P. O'LEARY University of Maryland We present algorithms for computing Research Corporation. O'Leary's work was supported by the National Science Foundation under Grant CCR-97@sandia.gov; D. P. O'Leary, Computer Science Department and Institute for Advanced Computer Studies, University
Computation and Uses of the Semidiscrete Matrix Decomposition
Kolda, T.G.; O'Leary, D.P.
1999-06-01T23:59:59.000Z
We derive algorithms for computing a semidiscrete approximation to a matrix in the Frobenius and weighted norms. The approximation is formed as a weighted sum of outer products of vectors whose elements are +/=1 or 0, so the storage required by the approximation is quite small.
IBM Research Report An Efficient Decomposition Algorithm for Static ...
2009-03-02T23:59:59.000Z
Feb 20, 2009 ... In this article, we are interested in optimization formulations involving a ..... appealing in terms of the approximation quality, because the ...
An interior-point Lagrangian decomposition method for separable ...
2009-02-04T23:59:59.000Z
1Katholieke Universiteit Leuven, Department of Electrical Engineering ... network flows) [1,2], process system engineering (e.g. distributed model ...... A first application that we will discuss here is the control of large-scale systems with .... with application to power system automatic generation control, IEEE Transactions
Parallel Triangular Decompositions of an Oil Refining Simulation Xiaodong Zhang
Moreno Maza, Marc
important process in oil refining is to separate the crude oil into various oil products. This process the composition of the various oil products in designed refining columns operated under a given set of conditions oil products. This process is called distilla- tion, which is a thermal separation method
A Branch-and-Cut Decomposition Algorithm for Solving Chance ...
2013-04-03T23:59:59.000Z
a probabilistic constraint) states that the chosen decision vector should, with .... what we present here, but the mechanism for generating cuts is significantly .... if we don't assume f is convex, or that X is a convex set, then again (7) is not efficiently ... We now describe our procedure for generating valid inequalities of the form.
Balanced Decomposition for Power System Simulation on Parallel Computers
Catholic University of Chile (Universidad Católica de Chile)
industry and the associated academic research are requiring complex de- velopments in high performance computing tools, such as parallel computers, e cient compilers, graphic interfaces and algorithms including
Decomposition formula of the Jacobian group of plane curve (Draft)
International Association for Cryptologic Research (IACR)
) = f0(x, y) + a1f1(x, y) + .... + ad-gfd-g(x, y) (ai Fpn ) up to constant multiplication. Let us denote H(x, y) := f0(x, y) + A1f1(x, y) + .... + Ad-gfd-g(x, y) where Ai are variables and let S@kanto-gakuin.ac.jp) Fac. of Engineering, Kanto Gakuin Univ., Joint-work with Kazuto Matsuo(Kanagawa Univ.,) and Tsuyoshi
Skew-product decompositions of Brownian motions on manifolds: A ...
2002-07-25T23:59:59.000Z
(1) If (M,g) is an euclidean sphere, i.e. the sectional curvature K is constant and non- ..... 27,. 139–142. [6] A.R. Galmarino, Representation of an isotropic diffusion as a ... [19] H.S. Ruse, A.G. Walker, T.J. Willlmore, Harmonic Spaces, Edizioni ...
Decomposition algorithms for multi-area power system analysis
Min, Liang
2007-09-17T23:59:59.000Z
to update tie-line power flows calculated by Repeated Power Flow (RPF). These tie-line power flows are then treated as injections in the TTC calculation of each area, as the central entity coordinates these results to determine the final system-wide TTC...
Constraint Propagation and Decomposition Techniques for Highly Disjunctive and Highly
@bouyguestelecom.fr 1 Bouygues, Direction des Technologies Nouvelles, 1, av. E. Freyssinet, F-78061 Saint
Jon Ayers 1 Singular Value Decomposition, Its History and Applications
Marzuola, Jeremy
developed without the likes of Gauss and Cauchy, both who contributed to the field of Linear Algebra in its naissance (Steward, 551). In 1823 Gauss published his famous elimination algorithm for reducing matrices for the diagonalization of a symmetric matrix, and the canonical forms for pairs of bilinear functions which
Decomposition Algorithm for Optimizing Multi-server Appointment ...
2014-10-01T23:59:59.000Z
rooms (ORs) and minimizing the cost of operating ORs under uncertain surgery ... constraint with recourse variables, random technology matrix, and discrete ...
Minimum Cost Layout Decomposition and Legalization for Triple ...
2015-06-27T23:59:59.000Z
problem as a minimum cost coloring problem, and it is relaxed to a nonlinear 0-1 ... ered as a promising technology for next-generation lithogra- phy. However ...
Catalytic H2O2 decomposition on palladium surfaces
Salinas, S. Adriana
1998-01-01T23:59:59.000Z
foil. Cyclic voltammogram of an electrochemically cleaned polycrystalline palladium foil. The scan rate was 10 mV/s and the scan was started at 0. 25V. Potentials are relative to Ag/ AgC1 reference electrode. The electrolyte used was 1 M H, SO..., . . . 21 Fractional coverage (0) vs, time. The iodine concentration used was 1. 5x10 ' M and the volume used was 10 ml. The potential was stepped from 0. 3 V to 1. 15 V. The electrolyte used was HC104 (pH = 1). AES spectrum of a clean and well...
Decomposition Algorithms with Parametric Gomory Cuts for Two ...
2012-08-15T23:59:59.000Z
August 15, 2012. Abstract. We consider a class of two-stage stochastic integer programs with binary variables in the first stage and general integer variables in ...
Ketone Production from the Thermal Decomposition of Carboxylate Salts
Landoll, Michael 1984-
2012-08-15T23:59:59.000Z
The MixAlco process uses an anaerobic, mixed-culture fermentation to convert lignocellulosic biomass to carboxylate salts. The fermentation broth must be clarified so that only carboxylate salts, water, and minimal impurities remain. Carboxylate...
SPARSE AND LOW-RANK MATRIX DECOMPOSITION VIA ...
2009-10-04T23:59:59.000Z
resulting relative errors are mostly quite small and poor quality recovery .... cations to Hankel and Euclidean distance matrices, Proceedings of the American Control ... [32] M. Ng, P. A. Weiss and X. M. Yuan, Solving constrained total-
Research Article Kinetic Study of Epoxy Resin Decomposition
Guo, John Zhanhu
on chemical recycling of plastics using SCW and NCW has also been conducted. It was found that the condensation polymers, i.e., polyurethane, Nylon 6, and polycarbonates, could be read- ily decomposed
Ruin probabilities and decompositions for general perturbed risk processes
Vondraèek, Zoran
-Hinchin type formula for the survival proba- bility of that risk process, and give an interpretation: Risk theory, ruin probability, Pollaczek-Hinchin formula, subordinator, spectrally negative L/c survival probability
Domain Decomposition Preconditioners for Higher-Order Discontinuous Galerkin Discretizations
Peraire, Jaime
(2005) Submitted to the Department of Aeronautics and Astronautics in partial fulfillment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Department of Aeronautics and Astronautics Sept 23, 2011 Certified by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . David L. Darmofal Professor of Aeronautics and Astronautics Thesis Supervisor Certified
Decomposition and Organic Matter Quality in Continental Peatlands
Turetsky, Merritt
deglaciation and represent a long-term sink for atmospheric carbon dioxide (CO2). Soil temperatures incubations to quantify carbon dioxide (CO2) pro- duction in peat formed under different permafrost regimes (Alberta, Sas- katchewan) or within depth intervals (surface, deep). Internal lawn peat produces more CO2
Method of generating hydrogen by catalytic decomposition of water
Balachandran, Uthamalingam (Hinsdale, IL); Dorris, Stephen E. (LaGrange Park, IL); Bose, Arun C. (Pittsburgh, PA); Stiegel, Gary J. (Library, PA); Lee, Tae-Hyun (Naperville, IL)
2002-01-01T23:59:59.000Z
A method for producing hydrogen includes providing a feed stream comprising water; contacting at least one proton conducting membrane adapted to interact with the feed stream; splitting the water into hydrogen and oxygen at a predetermined temperature; and separating the hydrogen from the oxygen. Preferably the proton conducting membrane comprises a proton conductor and a second phase material. Preferable proton conductors suitable for use in a proton conducting membrane include a lanthanide element, a Group VIA element and a Group IA or Group IIA element such as barium, strontium, or combinations of these elements. More preferred proton conductors include yttrium. Preferable second phase materials include platinum, palladium, nickel, cobalt, chromium, manganese, vanadium, silver, gold, copper, rhodium, ruthenium, niobium, zirconium, tantalum, and combinations of these. More preferably second phase materials suitable for use in a proton conducting membrane include nickel, palladium, and combinations of these. The method for generating hydrogen is preferably preformed in the range between about 600.degree. C. and 1,700.degree. C.
Decomposition Algorithms for Two-Stage Chance-Constrained ...
2014-08-11T23:59:59.000Z
Mar 1, 2014 ... power system operator wishes to have a plan in which all energy ... §2 an alternative model for risk management, which models the need to ...
Pressure Dependent Decomposition Kinetics of the Energetic Material HMX up
Office of Scientific and Technical Information (OSTI)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,SeparationConnect JournalPentoxide. (Journal Article)(Conference) | SciTechTransition. (Conference) | SciTechto
Pressure Dependent Decomposition Kinetics of the Energetic Material HMX up
Office of Scientific and Technical Information (OSTI)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,SeparationConnect JournalPentoxide. (Journal Article)(Conference) | SciTechTransition. (Conference) |
Urea Decomposition and SCR Performance at Low Temperature | Department of
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
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A conic interior point decomposition approach for large scale ...
2005-12-15T23:59:59.000Z
the multiplicity of the minimum eigenvalue of the dual slack matrix associated with the semidefinite ...... Ai(Xi) = b represent common resources shared by the r ...
Masas and Bimodule Decompositions of II_1 Factors
Mukherjee, Kunal K.
2010-10-12T23:59:59.000Z
x,y ? M. (ii) A has the weak asymptotic homomorphism property (WAHP) if, for each epsilon1 > 0 and each finite subset x1,??? ,xn ? M there is an unitary u?A such that vextenddoublevextenddoubleE A(xiux?j)?EA(xi)uEA(x?j) vextenddoublevextenddouble 2...
A Numerical Method for Computing an SVD-like Decomposition
Xu, Hongguo
2005-09-05T23:59:59.000Z
variety of applications. One example is the linear Hamiltonian system [19] x?(t) = JAx(t), x(0) = x0, where A ? R2m×2m is real symmetric positive definite. The solution of such a Hamil- tonian system satisfies xT (t)Ax(t) = xT0 Ax0 ?t ? 0.(1.4) This shows... one fundamental principle of the Hamiltonian system, the conservation law. The solution x(t) can be computed by using the structured canonical form of the Hamiltonian matrix JA. Since A is positive definite, one can compute the factorization A = BTB...
Flows and Decompositions of Games: Harmonic and Potential Games
2010-05-13T23:59:59.000Z
immediately follows from Proposition 1 that dimP = h2 ?1, dimH = (h?1)2 and dimN = 2h. For simplicity, we further assume that the payoffs are normalized4. Thus ...
Spinodal decomposition in particle-laden Landau-Levich flow
Kao, Justin C. T.
We examine Landau-Levich coating by a suspension of spherical particles. For particles larger than the liquid film thickness, capillary forces lead to self-assembly of monolayer particle aggregates. We observe two regimes ...
DECOMPOSITION OF CALCIUM SULFATE: A REVIEW OF THE LITERATURE
Office of Scientific and Technical Information (OSTI)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23Tribal EnergyCatalytic Coby ModsEnergy, science, andEnergy,Contact Us Contact Us
Characterization of explosives processing waste decomposition due to composting
Griest, W.H.; Tyndall, R.L.; Stewart, A.J.; Ho, C.H.; Ironside, K.S.; Caton, J.E.; Caldwell, W.M.; Tan, E.
1991-11-01T23:59:59.000Z
Static pile and mechanically stirred composts generated at the Umatilla Army Depot Activity in a field composting optimization study were chemically and toxicologically characterized to provide data for the evaluation of composting efficiency to decontaminate and detoxify explosives-contaminated soil. Characterization included determination of explosives and 2,4,6,-trinitrotoluene metabolites in composts and their EPA Synthetic Precipitation Leaching Procedure Leachates, leachate toxicity to Ceriodaphnia Dubia and mutagenicity of the leachates and organic solvent extracts of the composts to Ames bacterial strains TA-98 and TA-100. The main conclusion from this study is that composting can effectively reduce the concentrations of explosives and bacterial mutagenicity in explosives -- contaminated soil, and can reduce the aquatic toxicity of leachable compounds. Small levels of explosive and metabolites, bacterial mutagenicity, and leachable aquatic toxicity remain after composting. The ultimate fate of the biotransformed explosives, and the source(s) of residual toxicity and mutagenicity remain unknown.
Mixed-Integer Rounding Enhanced Benders Decomposition for ...
2014-11-13T23:59:59.000Z
Nov 13, 2014 ... Department of Industrial and Systems Engineering, University of ... modern forecasting procedures provide both a point estimate of the ...... Scheduling control for queueing systems with many servers: Asymptotic optimality.
Spectral decomposition of entangled photons with an arbitrary pump
Alison M. Yao
2010-12-22T23:59:59.000Z
We calculate the bi-photon state generated by spontaneous parametric down conversion in a thin crystal and under collinear phase matching conditions using a pump consisting of any superposition of Laguerre-Gauss modes. The result has no restrictions on the angular or radial momenta or, in particular, on the width of the pump, signal and idler modes. We demonstrate the strong effect of the pump to signal/idler width ratio on the composition of the down-converted entangled fields. Knowledge of the pump to signal/idler width ratio is shown to be essential when calculating the maximally entangled states that can be produced using pumps with a complex spatial profile.
Decomposition and Dynamic Cut Generation in Integer Linear ...
2004-08-18T23:59:59.000Z
tion procedures or by rewriting it as the equivalent linear program. zLD. = max ...... of a “class” of inequalities comes from the well-known template paradigm for separation, so named by ...... for Management of Operations and Logistics, 1995. 27.
Solid Double-Layered Hydroxide Catalysts for Lignin Decomposition - Energy
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (Million CubicRefinersUpcomingSmall-Industrial Sign IneditionSoftcontinuted) A B C D E F
Simultaneous Batching and Scheduling Using Dynamic Decomposition on a Grid
Mangasarian, Olvi L.
Production scheduling is a very important and challenging problem in many process industries. For example and consumer products, scheduling problems typically involve the sequence of production in continuous the allocation of limited resources (e.g. processing and storage units) to competing products and the sequencing
Flavor decomposition of the elastic nucleon electromagnetic form factors
C.D. Cates, C.W. Jager, S. Riordan, B. Wojtsekhowski
2011-06-01T23:59:59.000Z
The u- and d-quark contributions to the elastic nucleon electromagnetic form factors have been determined using experimental data on GEn , GMn , GpE , and GpM . Such a flavor separation of the form factors became possible up to 3.4 GeV2 with recent data on GEn from Hall A at JLab. At a negative four-momentum transfer squared Q2 above 1 GeV2, for both the u- and d-quark components, the ratio of the Pauli form factor to the Dirac form factor, F2/F1, was found to be almost constant, and for each of F2 and F1 individually, the d-quark component drops continuously with increasing Q2.
Two-Stage Decomposition Algorithms for Single Product Maritime ...
2013-09-21T23:59:59.000Z
... MIRPs for several products, including crude oil [23], fuel oil [2], liquefied ... discharge in a given period; and a deterministic per-period rate of production or ...
Method for increasing steam decomposition in a coal gasification process
Wilson, Marvin W. (Fairview, WV)
1988-01-01T23:59:59.000Z
The gasification of coal in the presence of steam and oxygen is significantly enhanced by introducing a thermochemical water-splitting agent such as sulfuric acid, into the gasifier for decomposing the steam to provide additional oxygen and hydrogen usable in the gasification process for the combustion of the coal and enrichment of the gaseous gasification products. The addition of the water-splitting agent into the gasifier also allows for the operation of the reactor at a lower temperature.
Towards An Automated Approach to Hardware/Software Decomposition
Qin, Shengchao
We propose in this paper an algebraic approach to hard-ware/software partitioning in Verilog Hardware Description Language (HDL). We explore a collection of algebraic laws for Verilog programs, from which we design a set ...
Hierarchical Reinforcement Learning with the MAXQ Value Function Decomposition
will produce better policies than Feudal Q learning. 1 Introduction Hierarchical approaches to reinforcement level can be thought of as an agent that must obey the commands of the level above it (its feudal lord(4,4), so the * is converted to a ne subgoal at level 2. In Feudal Q learning, each level i of the hierarchy
Revised, final form, July 1994 Domain Decomposition, Parallel Computing and
BjÃ¸rstad, Petter E.
Petter E. BjÃ¸rstad \\Lambda Terje KÅ¡arstad y Abstract A prototype black oil simulator is described describing the flow in porous media is a nonlinear system consisting of an elliptic equation and a formally parabolic convectionÂdiffusion equation. Our algorithms and techniques apply to a much larger class
Thermal decomposition study of hydroxylamine nitrate during storage and handling
Zhang, Chuanji
2007-09-17T23:59:59.000Z
incidents from 1972 to 1997. One major HAN incident was an explosion on May 14, 1997, in the Chemical Preparation Room of the Plutonium Reclamation Facility at the Hanford Plutonium Finishing Plant (U.S. Department of Energy, 1998). The investigation...
Expected Future Value Decomposition Based Bid Price Generation ...
2009-11-15T23:59:59.000Z
demand management decisions of these resources must be coordinated, ... Additive bid prices are easy to implement and popular in practice, however non- ...... In general, we can say that EFVN is consistently the best method in terms of AvgRev, ... constraints prevent an adaptive response to the realization of demand
Decomposition of the wave eld into optimized Gaussian packets
Cerveny, Vlastislav
, Gabor function, coherent-state transform, prestack depth migration, common-shot gather. 1 Introduction Our long-term project is to explore the properties of a depth migration method based on Gaussian;eld into optimized Gaussian packets is of key impor- tance in the Gaussian packet migration. We
DECOMPOSITION OF THE WAVE FIELD INTO OPTIMIZED GAUSSIAN PACKETS
Cerveny, Vlastislav
represents a crucial step of the Gaussian packet prestack depth migration algorithm. The shape of optimized, coherent-state transform, prestack depth migration, common shot gather 1. INTRODUCTION Our long-term project is to explore the properties of a depth migration method based on Gaussian packets. Gaussian
On the Implementation of Interior Point Decomposition Algorithms for ...
2005-10-31T23:59:59.000Z
Oct 31, 2005 ... Their analysis extends the earlier results of Zhao ..... The seminal mean-variance model of Markowitz [15] provides a quantitative framework for establishing a balance of the risk and return characteristics of various asset ...
VARIATIONAL MODELS FOR IMAGE COLORIZATION VIA CHROMATICITY AND BRIGHTNESS DECOMPOSITION
regions with color are given. We propose a couple of variational models using chromaticity color component algorithm using weighted distance image blending technique is studied in [49]. The authors utilize Dijkstra, and YCbCr (Luminance,two color-difference components) widely used for digital video; nonlinear color
Generalized spectral decomposition method for solving stochastic finite element equations
Paris-Sud XI, Université de
or stochastic bases, have been proposed in order to reduce these computational costs. Recently, a new ap- proach times and memory requirements. The reduction of these computational costs has now become a key question and the automatic construction of reduced bases. In this paper, the concept of GSD, initially introduced for a class
The LATIN multiscale computational method and the Proper Generalized Decomposition
drastically and presents some sim- ilarities with the POD. Initially introduced for the analyze and reduction numbers of degrees of freedom and the corresponding calcula- tion costs are generally prohibitive. There and the macroscale. A new micro/macro computational strat- egy was proposed in [18] which involved space and time
Correlation matrix decomposition of WIG20 intraday fluctuations
Rak, R; Kwapien, J; Oswiecimka, P
2006-01-01T23:59:59.000Z
Using the correlation matrix formalism we study the temporal aspects of the Warsaw Stock Market evolution as represented by the WIG20 index. The high frequency (1 min) WIG20 recordings over the time period between January 2001 and October 2005 are used. The entries of the correlation matrix considered here connect different distinct periods of the stock market dynamics, like days or weeks. Such a methodology allows to decompose the price fluctuations into the orthogonal eigensignals that quantify different modes of the underlying dynamics. The magnitudes of the corresponding eigenvalues reflect the strengths of such modes. One observation made in this paper is that strength of the daily trend in the WIG20 dynamics systematically decreases when going from 2001 to 2005. Another is that large events in the return fluctuations are primarily associated with a few most collective eigensignals.
A Decomposition for In-place Matrix Transposition Bryan Catanzaro
algorithm: we have measured median throughput of 19.5 GB/s on an NVIDIA Tesla K20c processor/s throughput on the K20c, which is up to 45 times faster than compiler-generated Ar- ray of Structures accesses
DECOMPOSITION-BASED ASSEMBLY SYNTHESIS OF STRUCTURAL PRODUCTS: PRELIMINARY RESULTS
Saitou, Kazuhiro "Kazu"
Department of Mechanical Engineering and Applied Mechanics University of Michigan, Ann Arbor USA F. Arkin Yetis Department of Mechanical Engineering and Applied Mechanics University of Michigan, Ann Arbor USA products such as automotive bod- ies are made of multiple components with relatively simple geometries
Taylor Series as Wide-sense Biorthogonal Wavelet Decomposition
H. M. de Oliveira; R. D. Lins
2015-02-05T23:59:59.000Z
Pointwise-supported generalized wavelets are introduced, based on Dirac, doublet and further derivatives of delta. A generalized biorthogonal analysis leads to standard Taylor series and new Dual-Taylor series that may be interpreted as Laurent Schwartz distributions. A Parseval-like identity is also derived for Taylor series, showing that Taylor series support an energy theorem. New representations for signals called derivagrams are introduced, which are similar to spectrograms. This approach corroborates the impact of wavelets in modern signal analysis.
Masas and Bimodule Decompositions of II_1 Factors
Mukherjee, Kunal K.
2010-10-12T23:59:59.000Z
Radon measure on a metric space X and T be a measurable map into (Y,?Y ). Let ? be a ?-finite measure on ?Y such that T??lessmuch?. If ?Y is countably generated and contains all singleton sets {t}, then ? has a (T,?) disintegration. The measures ?t... of Thm. II.16 is due to von Neumann. Proposition II.17. Let ? be a Radon measure on a compact metric space X and T be a measurable map into (Y,?Y ). Let ? be a ?-finite measure on ?Y such that T?? lessmuch ?. Assume that ?Y is countably generated...
Approximate inference : decomposition methods with applications to networks
Jung, Kyomin
2009-01-01T23:59:59.000Z
Markov random field (MRF) model provides an elegant probabilistic framework to formulate inter-dependency between a large number of random variables. In this thesis, we present a new approximation algorithm for computing ...
. The method employs an orthogonal polynomial collocation technique on multiple subdomains. The subdomain is a Chebyshev collocation method. Orthogonal polynomial techniques suffer from many drawbacks. For example(N 2 ) for a finite difference method. Despite the disadvantages orthogonal polynomials do give
Long-Term Sustainability of a High-Energy, Low-Diversity Crustal Biome
Hazen, Terry
microbial ecosystems examined to date (including subsea- floor sediments, deep-sea hydrother- mal vents
J Sched (2008) 11: 187204 DOI 10.1007/s10951-008-0053-0
Kaminsky, Philip M.
2008-01-01T23:59:59.000Z
these heuris- tics are asymptotically optimal. Computational testing fur- ther demonstrates the relative effectiveness of these heuris- tics under various conditions. Keywords Due date quotation · Scheduling · On
International Symposium on Site Characterization for CO2 Geological Storage
Tsang, Chin-Fu
2006-01-01T23:59:59.000Z
compromised by the drilling of wells. Well bores representoptimal points for drilling new well(s) are automaticallymay necessitate in drilling additional wells and fur- ther
to test antiviral drugs without using the small-pox virus itself and would focus on replica-
at Rokkasho. Last week, at a meeting in Vienna, Austria, nei- ther the E.U. nor Japan could persuade the other
Capps, Scott B; Zender, Charles S
2010-01-01T23:59:59.000Z
generator and gearbox inefficiencies. [ 37 ] The sensitivity of wind powergenerator/gearbox inefficiencies fur- ther reducing this limit. A wind turbine power
Building Technologies Program - 1995 Annual Report
Selkowitz, S.E.
2010-01-01T23:59:59.000Z
WI. Also ide Films for Electrochromic Devices," published as1) (1995). posited Electrochromic Coatings," nology: 1973-37747, July 1995. Use of Electrochromic Windows," Ther- LBL
Integrating POMDP and Reinforcement Learning for a Two Layer Simulated Robot Architecture
Pyeatt, Larry
and actuator mal function caused by hardware failure or low battery conditions. Our current system has two
Issues in moving to a semantic web for a large corporation.
Sleeman, Derek
presented by Mal- colm et al [16]. Due to the increase in virtual enterprises, lean and agile manufactur
CAPTEUR CAPACITIF DE PETITS DPLACEMENTS APPLICATION A LA RALISATION D'UNE BALANCE
Boyer, Edmond
sensibles, mais se prêtant mal à l'enre- gistrement, les capteurs potentiométriques, très simples et peu
Neubauer, M. L.; Dudas, A.; Sah, R.; Elliott, T. S.; Rimmer, R. A.; Stirbet, M. S.
2010-05-23T23:59:59.000Z
A superconducting RF (SRF) power coupler capable of handling 500 kW CW RF power is required for present and future storage rings and linacs. There are over 35 coupler designs for SRF cavities ranging in frequency from 325 to 1500 MHz. Coupler windows vary from cylinders to cones to disks, and RF power couplers are limited by the ability of ceramic windows to withstand the stresses due to heating and mechanical flexure. We propose a novel robust co-axial SRF coupler design which uses compressed window technology. This technology will allow the use of highly thermally conductive materials for cryogenic windows. Using compressed window techniques on disk co-axial windows will make significant improvements in the power handling of SRF couplers. We present the bench test results of two window assemblies back to back, as well as individual window VSWR in EIA3.125 coax. A vacuum test assembly was made and the windows baked out at 155C. The processes used to build windows is scalable to larger diameter coax and to higher power levels.
A Flow-Channel Analysis for the Mars Hopper
W. Spencer Cooley
2013-02-01T23:59:59.000Z
The Mars Hopper is an exploratory vehicle designed to fly on Mars using carbon dioxide from the Martian atmosphere as a rocket propellant. The propellent gasses are thermally heated while traversing a radioisotope ther- mal rocket (RTR) engine’s core. This core is comprised of a radioisotope surrounded by a heat capacitive material interspersed with tubes for the propellant to travel through. These tubes, or flow channels, can be manu- factured in various cross-sectional shapes such as a special four-point star or the traditional circle. Analytical heat transfer and computational fluid dynamics (CFD) anal- yses were performed using flow channels with either a circle or a star cross- sectional shape. The nominal total inlet pressure was specified at 2,805,000 Pa; and the outlet pressure was set to 2,785,000 Pa. The CO2 inlet tem- perature was 300 K; and the channel wall was 1200 K. The steady-state CFD simulations computed the smooth-walled star shape’s outlet temper- ature to be 959 K on the finest mesh. The smooth-walled circle’s outlet temperature was 902 K. A circle with a surface roughness specification at 0.01 mm gave 946 K and at 0.1 mm yielded 989 K. The The effects of a slightly varied inlet pressure were also examined. The analytical calculations were based on the mass flow rates computed in the CFD simulations and provided significantly higher outlet temperature results while displaying the same comparison trends. Research relating to the flow channel heat transfer studies was also done. Mathematical methods to geometrically match the cross-sectional areas of the circle and star, along with a square and equilateral triangle, were derived. A Wolfram Mathematica 8 module was programmed to analyze CFD results using Richardson Extrapolation and calculate the grid convergence index (GCI). A Mathematica notebook, also composed, computes and graphs the bulk mean temperature along a flow channel’s length while the user dynam- ically provides the input variables, allowing their effects on the temperature to be more easily observed.
Einat, Aharonov
The long runout of the Heart Mountain landslide: Heating, pressurization, and carbonate; accepted 8 July 2010; published 29 October 2010. [1] The Heart Mountain landslide of northwestern Wyoming emplacement of the Heart Mountain landslide that is independent of slide triggering. The mechanism
Figure 30. Decomposition 4941 of Energy Use by Effect, 1988-1994,
Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23 362 334 318Cubic Feet) YearSalesNew2003 Detailed TablesProved56 125 102 52Cubic3 PC's
DECOMPOSITION OF LIGNIN AND CELLOBIOSE IN RELATION TO THE ENZYMATIC HYDROLYSIS OF CELLULOSE
Yamanaka, Y.
2010-01-01T23:59:59.000Z
culture of the fungus in a composting mode suggest thatresults were obtained in composting culture of ground woodfeasibility of the composting method remains in doubt. II.
Banker, Donald Henry
1966-01-01T23:59:59.000Z
& j & n+1. (k) (k) The elements of A are defined in terms of the ik row by (2 18) (k) (k-1) (k-1) (k-1) ikk ikk ~1 ik4 i k for 1 & k & n, ik p ik 1, ik-2''''' 1' (2 ] 9) a(k) (a(k 1) 1 (k-1) (k-1) ) ) ] ya(k) kj ikj ~ 1 k ~j k fork& j &n+1; (2.... 85) follows from (2. 84) will be accom- plished by a case by case description of the elements pro- duced by the product R S (k-1} Case 1 i & k & m-1; 1 & j & n. (k) (k-1) ~ ~ (k-1) (k-1) 1"i~ 4] . 1 ii Cj ig (k) ij 36 Case II k&i&n; j &i. (k...
An MILP-MINLP decomposition method for the global optimization of ...
2015-03-27T23:59:59.000Z
combining the p and q models to avoid additional bilinear terms that arise ..... streams to blending tanks is not allowed, i.e. flow cannot enter and exit ...... means that, after finding the same solution of 177.3, SCIP continues the search until the.
Plan Quality Optimisation via Block Decomposition Fazlul Hasan Siddiqui and Patrik Haslum
Haslum, Patrik
to be used at any point on the efficiencyquality trade-off scale. Anytime planners promise to provide