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1

Introducing Matrix Operations through Biological Applications  

NSDL National Science Digital Library

For the Blue Waters Undergraduate Petascale Education Program (NSF), we developed a computational science module, "Living Links: Applications of Matrix Operations to Population Studies," which introduces matrix operations using applications to population studies and provides accompanying programs in a variety of systems (C/MPI, MATLAB, Mathematica). The module provides a foundation for the use of matrix operations that are essential to modeling numerous computational science applications from population studies to social networks. This paper describes the module; details experiences using the material in two undergraduate courses (High Performance Computing and Linear Algebra) in 2010 and 2011 at Wofford College and two workshops for Ph.D. students at Monash University in Melbourne, Australia, in 2011; and describes refinements to the module based on suggestions in student and instructor evaluations.

Shiflet, Angela B.; Shiflet, George W.

2

Living Links: Applications of Matrix Operations to Population Studies  

NSDL National Science Digital Library

Many computational science models involve matrices. This module will provide a foundation for understanding matrices and some of their operations with examples from population dynamics and will provide background material for other computational science modules. The module will also have a discussion of the importance of matrices in many models that employ high performance computing. The model will have two accompanying tutorials. One will include some of the basics of MPI. The other will provide an introduction to matrices in Mathematica along with Grid Mathematica.

Angela B. Shiflet, George W. Shiflet, Jesse A. Hanley

3

Matrix-free application of Hamiltonian operators in Coifman wavelet bases.  

PubMed

A means of evaluating the action of Hamiltonian operators on functions expanded in orthogonal compact support wavelet bases is developed, avoiding the direct construction and storage of operator matrices that complicate extension to coupled multidimensional quantum applications. Application of a potential energy operator is accomplished by simple multiplication of the two sets of expansion coefficients without any convolution. The errors of this coefficient product approximation are quantified and lead to use of particular generalized coiflet bases, derived here, that maximize the number of moment conditions satisfied by the scaling function. This is at the expense of the number of vanishing moments of the wavelet function (approximation order), which appears to be a disadvantage but is shown surmountable. In particular, application of the kinetic energy operator, which is accomplished through the use of one-dimensional (1D) [or at most two-dimensional (2D)] differentiation filters, then degrades in accuracy if the standard choice is made. However, it is determined that use of high-order finite-difference filters yields strongly reduced absolute errors. Eigensolvers that ordinarily use only matrix-vector multiplications, such as the Lanczos algorithm, can then be used with this more efficient procedure. Applications are made to anharmonic vibrational problems: a 1D Morse oscillator, a 2D model of proton transfer, and three-dimensional vibrations of nitrosyl chloride on a global potential energy surface. PMID:20590186

Acevedo, Ramiro; Lombardini, Richard; Johnson, Bruce R

2010-06-28

4

Matrix-free application of Hamiltonian operators in Coifman wavelet bases  

Microsoft Academic Search

A means of evaluating the action of Hamiltonian operators on functions expanded in orthogonal compact support wavelet bases is developed, avoiding the direct construction and storage of operator matrices that complicate extension to coupled multidimensional quantum applications. Application of a potential energy operator is accomplished by simple multiplication of the two sets of expansion coefficients without any convolution. The errors

Ramiro Acevedo; Richard Lombardini; Bruce R. Johnson

2010-01-01

5

Resonances for matrix Schrödinger operators  

Microsoft Academic Search

We study the resonances of matrix Schrödinger operators,\\u000amotivated by the Born-Oppenheimer approximation. We give a simple\\u000acriterion for the potential to generate resonances. This criterion\\u000aalso gives the location of the resonances generated.

L. Nedelec

2001-01-01

6

Matrix Nearness Problems and Applications  

Microsoft Academic Search

A matrix nearness problem consists of finding, for an arbitrary matrix A, a nearest member of some given class of matrices, where distance is measured in a matrix norm. A survey of nearness problems is given, with particular emphasis on the fundamental properties of symmetry, positive definiteness, orthogonality, normality, rank-deficiency and instability. Theoretical results and computational methods are described. Applications

Nicholas J. Higham

1989-01-01

7

Density-matrix renormalization-group algorithms with nonorthogonal orbitals and non-Hermitian operators, and applications to polyenes  

SciTech Connect

We describe the theory and implementation of two extensions to the density-matrix renormalization-group (DMRG) algorithm in quantum chemistry: (i) to work with an underlying nonorthogonal one-particle basis (using a biorthogonal formulation) and (ii) to use non-Hermitian and complex operators and complex wave functions, which occur naturally in biorthogonal formulations. Using these developments, we carry out ground-state calculations on ethene, butadiene, and hexatriene, in a polarized atomic-orbital basis. The description of correlation in these systems using a localized nonorthogonal basis is improved over molecular-orbital DMRG calculations, and comparable to or better than coupled-cluster calculations, although we encountered numerical problems associated with non-Hermiticity. We believe that the non-Hermitian DMRG algorithm may further become useful in conjunction with other non-Hermitian Hamiltonians, for example, similarity-transformed coupled-cluster Hamiltonians.

Chan, Garnet Kin-Lic; Van Voorhis, Troy [Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853-1301 (United States); Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307 (United States)

2005-05-22

8

Renormalon ambiguities in NRQCD operator matrix elements  

SciTech Connect

We analyze the renormalon ambiguities that appear in factorization formulas in QCD. Our analysis contains a simple argument that the ambiguities in the short-distance coefficients and operator matrix elements are artifacts of dimensional-regularization factorization schemes and are absent in cutoff schemes. We also present a method for computing the renormalon ambiguities in operator matrix elements and apply it to a computation of the ambiguities in the matrix elements that appear in the NRQCD factorization formulas for the annihilation decays of {ital S}-wave quarkonia. Our results, combined with those of Braaten and Chen for the short-distance coefficients, provide an explicit demonstration that the ambiguities cancel in the physical decay rates. In addition, we analyze the renormalon ambiguities in the Gremm-Kapustin relation and in various definitions of the heavy-quark mass. {copyright} {ital 1999} {ital The American Physical Society}

Bodwin, G.T. [High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Chen, Y. [Physics Department, Ohio State University, Columbus, Ohio 43210 (United States)

1999-09-01

9

Renormalon ambiguities in NRQCD operator matrix elements  

NASA Astrophysics Data System (ADS)

We analyze the renormalon ambiguities that appear in factorization formulas in QCD. Our analysis contains a simple argument that the ambiguities in the short-distance coefficients and operator matrix elements are artifacts of dimensional-regularization factorization schemes and are absent in cutoff schemes. We also present a method for computing the renormalon ambiguities in operator matrix elements and apply it to a computation of the ambiguities in the matrix elements that appear in the NRQCD factorization formulas for the annihilation decays of S-wave quarkonia. Our results, combined with those of Braaten and Chen for the short-distance coefficients, provide an explicit demonstration that the ambiguities cancel in the physical decay rates. In addition, we analyze the renormalon ambiguities in the Gremm-Kapustin relation and in various definitions of the heavy-quark mass.

Bodwin, Geoffrey T.; Chen, Yu-Qi

1999-09-01

10

Matrix representation of the time operator  

SciTech Connect

In quantum mechanics the time operator {Theta} satisfies the commutation relation [{Theta}, H]=i, and thus it may be thought of as being formally canonically conjugate to the Hamiltonian H. The time operator associated with a given Hamiltonian H is not unique because one can replace {Theta} by {Theta}+{Theta}{sub hom}, where {Theta}{sub hom} satisfies the homogeneous condition [{Theta}{sub hom}, H]= 0. To study this nonuniqueness the matrix elements of {Theta} for the harmonic-oscillator Hamiltonian are calculated in the eigenstate basis. This calculation requires the summation of divergent series, and the summation is accomplished by using zeta-summation techniques. It is shown that by including appropriate homogeneous contributions, the matrix elements of {Theta} simplify dramatically. However, it is still not clear whether there is an optimally simple representation of the time operator.

Bender, Carl M. [Department of Physics, Kings College London, Strand, London WC2R 1LS (United Kingdom); Gianfreda, Mariagiovanna [Dipartimento di Matematica e Fisica, Universita del Salento and I.N.F.N. Sezione di Lecce, Via Arnesano, I-73100 Lecce (Italy)

2012-06-15

11

Applications of matrix inversion tomosynthesis  

NASA Astrophysics Data System (ADS)

The improved image quality and characteristics of new flat- panel x-ray detectors have renewed interest in advanced algorithms such as tomosynthesis. Digital tomosynthesis is a method of acquiring and reconstructing a three-dimensional data set with limited-angle tube movement. Historically, conventional tomosynthesis reconstruction has suffered contamination of the planes of interest by blurred out-of- plane structures. This paper focuses on a Matrix Inversion Tomosynthesis (MITS) algorithm to remove unwanted blur from adjacent planes. The algorithm uses a set of coupled equations to solve for the blurring function in each reconstructed plane. This paper demonstrates the use of the MITS algorithm in three imaging applications: small animal microscopy, chest radiography, and orthopedics. The results of the MITS reconstruction process demonstrate an improved reduction of blur from out-of-plane structures when compared to conventional tomosynthesis. We conclude that the MITS algorithm holds potential in a variety of applications to improve three-dimensional image reconstruction.

Warp, Richard J.; Godfrey, Devon J.; Dobbins, James T.

2000-04-01

12

Superstring vertex operators in type IIB matrix model  

SciTech Connect

We clarify the relation between the vertex operators in type IIB matrix model and superstring. Green-Schwarz light-cone closed superstring theory is obtained from IIB matrix model on two-dimensional noncommutative backgrounds. Superstring vertex operators should be reproduced from those of IIB matrix model through this connection. Indeed, we confirm that supergravity vertex operators in IIB matrix model on the two-dimensional backgrounds reduce to those in superstring theory. Noncommutativity plays an important role in our identification. Through this correspondence, we can reproduce superstring scattering amplitudes from IIB matrix model.

Kitazawa, Yoshihisa [High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801 (Japan); Department of Particle and Nuclear Physics, Graduate University for Advanced Studies, Tsukuba, Ibaraki 305-0801 Japan (Japan); Nagaoka, Satoshi [High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801 (Japan)

2008-06-15

13

Wilson loops and vertex operators in a matrix model  

SciTech Connect

We systematically construct wave functions and vertex operators in the type IIB (IKKT) matrix model by expanding a supersymmetric Wilson loop operator. They form a massless multiplet of the N=2 type IIB supergravity and automatically satisfy conservation laws.

Iso, Satoshi; Terachi, Hidenori [Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK) Oho 1-1, Tsukuba, Ibaraki 305-0801 (Japan) and Department of Particle and Nuclear Physics, The Graduate University for Advanced Studies (Sokendai) Oho 1-1, Tsukuba, Ibaraki 305-0801 (Japan); Umetsu, Hiroshi [Okayama Institute for Quantum Physics, 1-9-1 Kyoyama, Okayama City, Okayama 700-0015 (Japan)

2004-12-15

14

Modification of Matrix Models by Square Terms of Scaling Operators  

Microsoft Academic Search

We study one (or two) matrix models modified by terms of the form $g(\\\\rho(P))^2 + g'(\\\\rho'({\\\\cal{O}}))^2$, where the matrix representation of the puncture operator $P$ and the one of a scaling operator ${\\\\cal{O}}$ are denoted by $\\\\rho(P)$ and $\\\\rho'({\\\\cal{O}})$ respectively. We rewrite the modified models as effective theories of baby universes. We find an upper bound for the gravitational dimension

Hiroshi Shirokura

1994-01-01

15

Operational Models Matrix: Characteristics of Operational NWP Models  

NSDL National Science Digital Library

Characteristics of Operational NWP Models, part of the Numerical Weather Prediction Professional Development Series, contains information about the characteristics and architecture of commonly used operational models, their operationally significant strengths and weaknesses, and model assessment tools. The information is updated whenever significant model changes are made. The module is linked to the Impact of Model Numerics on Weather Depiction module (also in the NWP PDS), which provides background information about model components.

Spangler, Tim

2003-01-01

16

Multiplier operator algebras and applications  

PubMed Central

The one-sided multipliers of an operator space X are a key to “latent operator algebraic structure” in X. We begin with a survey of these multipliers, together with several of the applications that they have had to operator algebras. We then describe several new results on one-sided multipliers, and new applications, mostly to one-sided M-ideals.

Blecher, David P.; Zarikian, Vrej

2004-01-01

17

Active matrix OLED for rugged HMD and viewfinder applications  

Microsoft Academic Search

We present characterization of a full-color 852x3x600-pixel, active matrix organic light emitting diode (AMOLED) color microdisplay (eMagin Corporation's SVGA+ display) for environmentally demanding applications. The results show that the AMOLED microdisplay can provide cold-start turn-on and operate at extreme temperature conditions, far in excess of non-emissive displays. Correction factors for gamma response of the AMOLED microdisplay as a function of

Kia Low; Susan K. Jones; Olivier Prache; David A. Fellowes

2004-01-01

18

Matrix Operator Theory of Radiative Transfer 1: Rayleigh Scattering  

Microsoft Academic Search

An entirely rigorous method for the solution of the equations for radiative transfer based on the matrix operator theory is reviewed. The advantages of the present method are: (1) all orders of the reflection and transmission matrices are calculated at once; (2) layers of any thickness may be combined, so that a realistic model of the atmosphere can be developed

Gilbert N. Plass; George W. Kattawar; Frances E. Catchings

1973-01-01

19

Analytic calculation of arbitrary matrix elements for the boson exponential quadratic operator  

NASA Astrophysics Data System (ADS)

Making use of the transformation relation between the ordinary form and the antinormal product form of boson exponential quadratic operators (BEQO's), we present an effective method which can be conveniently used to calculate arbitrary matrix elements of BEQO's. By this method, some important matrix elements have been calculated analytically. As a preliminary application, we obtain the exact solution of the density matrix and partition function for the general boson quadratic Hamiltonian without any information for the energy level. As a natural extension, we also obtain the partition function for a general fermion quadratic system.

Pan, Jian-Wei; Dong, Qin-Xi; Zhang, Yong-De; Hou, Guang; Wang, Xiang-Bin

1997-09-01

20

Metal Matrix Microencapsulated Fuel Technology for LWR Applications  

SciTech Connect

An overview of the metal matrix microencapsulated (M3) fuel concept for the specific LWR application has been provided. Basic fuel properties and characteristics that aim to improve operational reliability, enlarge performance envelope, and enhance safety margins under design-basis accident scenarios are summarized. Fabrication of M3 rodlets with various coated fuel particles over a temperature range of 800-1300 C is discussed. Results from preliminary irradiation testing of LWR M3 rodlets with surrogate coated fuel particles are also reported.

Terrani, Kurt A [ORNL; Bell, Gary L [ORNL; Kiggans, Jim [ORNL; Snead, Lance Lewis [ORNL

2012-01-01

21

R-matrix parameters in reactor applications  

SciTech Connect

The key role of the resonance phenomena in reactor applications manifests through the self-shielding effect. The basic issue involves the application of the microscopic cross sections in the macroscopic reactor lattices consisting of many nuclides that exhibit resonance behavior. To preserve the fidelity of such a effect requires the accurate calculations of the cross sections and the neutron flux in great detail. This clearly not possible without viable resonance data. Recently released ENDF/B VI resonance data in the resolved range especially reflect the dramatic improvement in two important areas; namely, the significant extension of the resolved resonance ranges accompanied by the availability of the R-matrix parameters of the Reich-Moore type. Aside from the obvious increase in computing time required for the significantly greater number of resonances, the main concern is the compatibility of the Riech-Moore representation to the existing reactor processing codes which, until now, are based on the traditional cross section formalisms. This purpose of this paper is to summarize our recent efforts to facilitate implementation of the proposed methods into the production codes at ANL.

Hwang, R.N.

1992-01-01

22

Cloning operator and its applications  

NASA Astrophysics Data System (ADS)

A novel genetic operator called cloning is introduced and tested in different applications of genetic algorithms. Essentially, the cloning monotonically increases the lengths of the chromosomes during the evolution. It is argued that, under these circumstances, the cloning operator can accommodate a multiresolution search strategy, where the search starts at coarser scales and is subsequently mapped to finer scales upon achieving some in-scale performance criteria. Although the practical implementation of cloning is application dependent, a few general requirements are stated. In the remainder of the paper, different implementations of the cloning operator are introduced and employed in distinct applications, namely, function optimization, object support reconstruction from the support of its autocorrelation and the shortest path problem in planar graphs. The first two cases present typical multiresolution approaches to search problems and their results show consistent improvements in convergence speed with respect to classical genetic algorithms. In the last problem, a cloning operator is incorporated in an evolutionary algorithm that builds a set of valid paths in a planar graph. It is demonstrated that cloning can enhance the ability of a genetic algorithm to explore the search space efficiently in some applications.

Voicu, Liviu I.; Myler, Harley R.; Toma, Cristian E.

1998-03-01

23

Maple code for the calculation of the matrix elements of the Boltzmann collision operators for mixtures  

NASA Astrophysics Data System (ADS)

A Maple code is provided which is used to compute the matrix elements of the collision operators in the Boltzmann equation for arbitrary differential elastic collision cross section. The present paper describes an efficient method for the calculation of the matrix elements of the collision operators in the Sonine basis set. The method employs the generating functions for these polynomials. The transport properties of gaseous mixtures of atoms and/or ions are generally determined from solutions of the Boltzmann equation. The solution of the Boltzmann equation for the velocity distribution functions requires a representation of the integral collision operators defined by the differential cross sections describing collisions between pairs of particles. Many applications have considered either the simple hard sphere cross section or the cross section corresponding to the inverse fourth power of the inter-particle distance (“Maxwell molecules”). There are a few applications where realistic quantum mechanical cross sections have been used. The basis set of Sonine (or Laguerre) polynomials is the basis set of choice used to represent the distribution functions. The Maple code provided is used to express the matrix elements of the collision operators in terms of a finite sum of the omega integrals of transport theory and defined by the differential cross section. Thus the matrix representations of the collision operators are applicable to arbitrary interaction potentials. Catalogue identifier: AEGJ_v1_0 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEGJ_v1_0.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 2422 No. of bytes in distributed program, including test data, etc.: 48?653 Distribution format: tar.gz Programming language: Maple Computer: Personal computer or workstation Operating system: Windows or Linux RAM: bytes Classification: 12 Nature of problem: The representation of the collision operators in the Boltzmann equation in the basis set of Sonine (Laguerre) polynomials. Solution method: The matrix element of the generating function for the Sonine polynomials are evaluated analytically. The individual matrix elements are the coefficients in the double power series expansion in two parameters. The Maple code is used to effect this expansion and extract the coefficients of the omega integrals. The omega integrals are defined by the differential cross section. Running time: A few seconds for the examples provided.

Shizgal, Bernie D.; Dridi, Raouf

2010-09-01

24

Fault tolerant matrix operations for networks of workstations using multiple checkpointing  

Microsoft Academic Search

Recently, an algorithm-based approach using diskless checkpointing has been developed to provide fault tolerance for high-performance matrix operations. With this approach, fault tolerance is incorporated into the matrix operations, making them resilient to any single process failure with low overhead. In this paper, we present a technique called multiple checkpointing that enables the matrix operations to tolerate a certain set

Youngbae Kimt; James S. Plank; Jack J. Dongarra

1997-01-01

25

Dense and Sparse Matrix Operations on the Cell Processor  

SciTech Connect

The slowing pace of commodity microprocessor performance improvements combined with ever-increasing chip power demands has become of utmost concern to computational scientists. Therefore, the high performance computing community is examining alternative architectures that address the limitations of modern superscalar designs. In this work, we examine STI's forthcoming Cell processor: a novel, low-power architecture that combines a PowerPC core with eight independent SIMD processing units coupled with a software-controlled memory to offer high FLOP/s/Watt. Since neither Cell hardware nor cycle-accurate simulators are currently publicly available, we develop an analytic framework to predict Cell performance on dense and sparse matrix operations, using a variety of algorithmic approaches. Results demonstrate Cell's potential to deliver more than an order of magnitude better GFLOP/s per watt performance, when compared with the Intel Itanium2 and Cray X1 processors.

Williams, Samuel W.; Shalf, John; Oliker, Leonid; Husbands,Parry; Yelick, Katherine

2005-05-01

26

Light-ray operators and their application in QCD  

SciTech Connect

The nonperturbative parton distribution and wave functions are directly related to matrix elements of light-ray (nonlocal) operators. These operators are generalizations of the standard local operators known from the operator product expansions. The renormalization group equation for these operators leads to evolution equations for more general distribution amplitudes which include the Altarelli-Parisi and the Brodsky-Lepage equations as special cases. It is possible to derive the Altarelli-Parisi kernel as a limiting case of the extended Brodsky-Lepage kernel. As a new application of the operator product expansion, the virtual Compton scattering near forward direction is considered.

Geyer, B.; Robaschik, D. [Leipzig Univ. (Germany). Fachbereich Physik; Mueller, D. [Stanford Linear Accelerator Center, Menlo Park, CA (United States)

1994-05-01

27

Structural and functional polymer-matrix composites for electromagnetic applications  

Microsoft Academic Search

This dissertation addresses the science and technology of functional and structural polymer-matrix composite materials for electromagnetic applications, which include electromagnetic interference (EMI) shielding and low observability (Stealth). The structural composites are continuous carbon fiber epoxy-matrix composites, which are widely used for airframes. The functional composites are composites with discontinuous fillers and in both bulk and coating forms. Through composite structure

Junhua Wu

2010-01-01

28

Matrix Converter Protection for More Electric Aircraft Applications  

Microsoft Academic Search

This paper explains the concept of a matrix converter, its features, advantages - disadvantages and emergency \\/ failure modes which require some sort of protection. The paper discusses existing protection strategies and introduce a more robust approach. Two target applications are used to explain the limitations of existing protection strategies. The first a 25 kVA matrix converter-permanent magnet synchronous machine

Lee Empringham; Liliana de Lillo; Patrick W Wheeler; Jon C Clare

2006-01-01

29

Design Structure Matrix Methods and Applications  

Microsoft Academic Search

Design structure matrix (DSM) is a straightforward and flexible modeling technique that can be used for designing, developing, and managing complex systems. DSM offers network modeling tools that represent the elements of a system and their interactions, thereby highlighting the system’s architecture (or designed structure). Its advantages include compact format, visual nature, intuitive representation, powerful analytical capacity, and flexibility. Used

Steven D. Eppinger; Tyson R. Browning

30

The Dirac operator on a finite domain and the R-matrix method  

NASA Astrophysics Data System (ADS)

Relativistic effects in electron-atom collisions and photo-excitation and -ionization processes increase in importance as the atomic number of the target atom grows and spin-dependent effects increase. A relativistic treatment in which electron motion is described using the Dirac Hamiltonian is then desirable. A version of the popular nonrelativistic R-matrix package incorporating terms from the Breit-Pauli Hamiltonian has been used for modelling such processes for some years. The fully relativistic Dirac R-matrix method has been less popular, but is becoming increasingly relevant for applications to heavy ion targets, where the need to use relativistic wavefunctions is more obvious. The Dirac R-matrix method has been controversial ever since it was first proposed by Goertzel (1948 Phys. Rev. 73 1463-6), and it is therefore important to confirm that recent elaborate and costly applications of the method, such as, Badnell et al (2004 J. Phys. B: At. Mol. Phys. 37 4589) and Ballance and Griffin (2007 J. Phys. B: At. Mol. Opt. Phys. 40 247-58), rest on secure foundations. The first part of this paper analyses the structure of the two-point boundary-value problem for the Dirac operator on a finite domain, from which we construct a unified derivation of the Schrödinger (nonrelativistic) and Dirac (relativistic) R-matrix methods. Suggestions that the usual relativistic theory is not well founded are shown to be without foundation.

Grant, I. P.

2008-03-01

31

Matrix variate logistic regression model with application to EEG data.  

PubMed

Logistic regression has been widely applied in the field of biomedical research for a long time. In some applications, the covariates of interest have a natural structure, such as that of a matrix, at the time of collection. The rows and columns of the covariate matrix then have certain physical meanings, and they must contain useful information regarding the response. If we simply stack the covariate matrix as a vector and fit a conventional logistic regression model, relevant information can be lost, and the problem of inefficiency will arise. Motivated from these reasons, we propose in this paper the matrix variate logistic (MV-logistic) regression model. The advantages of the MV-logistic regression model include the preservation of the inherent matrix structure of covariates and the parsimony of parameters needed. In the EEG Database Data Set, we successfully extract the structural effects of covariate matrix, and a high classification accuracy is achieved. PMID:22753784

Hung, Hung; Wang, Chen-Chien

2012-07-02

32

Geometric applications of a matrix searching algorithm  

Microsoft Academic Search

Let A be a matrix with real entries and let j(i) be the index of the leftmost column containing the maximum value in row i ofA. A is said to be monotone if il > i2 implies thatj(il) >-j(i2). A is totally monotone if all of its submatrices are monotone. We show that finding the maximum entry in each row

Alok Aggarwal; Maria M. Klawe; Shlomo Moran; Peter W. Shor; Robert E. Wilber

1986-01-01

33

Fluctuation studies in the infinite interval matrix representations of operator products and their decompositions  

SciTech Connect

In this work a study on finite dimensional matrix approximations to products of quantum mechanical operators is conducted. It is emphasized that the matrix representation of the product of two operators is equal to the product of the matrix representation of each of the operators when all the fluctuation terms are ignored. The calculation of the elements of the matrices corresponding to the matrix representation of various operators, based on three terms recursive relation is defined. Finally it is shown that the approximation quality depends on the choice of higher values of n, namely the dimension of Hilbert space.

Baykara, N. A.; Guervit, Ercan; Demiralp, Metin [Marmara University, Department of Mathematics, Goeztepe, 34722, Istanbul (Turkey); Istanbul Technical University, Informatics Institute, Maslak, 34469, Istanbul (Turkey)

2012-12-10

34

Applications of matrix solid-phase dispersion in food analysis  

Microsoft Academic Search

Matrix solid-phase dispersion (MSPD), a patented process for the simultaneous disruption and extraction of solid and semi-solid samples, was first reported in 1989. Since that time, MSPD has found application in numerous fields, but has proven to be particularly applicable for the analysis of drugs, pollutants, pesticides and other components in foods. The present article provides a review of these

Steven A Barker

2000-01-01

35

Second kind Chebyshev operational matrix algorithm for solving differential equations of Lane-Emden type  

NASA Astrophysics Data System (ADS)

In this paper, we present a new second kind Chebyshev (S2KC) operational matrix of derivatives. With the aid of S2KC, an algorithm is described to obtain numerical solutions of a class of linear and nonlinear Lane-Emden type singular initial value problems (IVPs). The idea of obtaining such solutions is essentially based on reducing the differential equation with its initial conditions to a system of algebraic equations. Two illustrative examples concern relevant physical problems (the Lane-Emden equations of the first and second kind) are discussed to demonstrate the validity and applicability of the suggested algorithm. Numerical results obtained are comparing favorably with the analytical known solutions.

Doha, E. H.; Abd-Elhameed, W. M.; Youssri, Y. H.

2013-10-01

36

Active matrix OLED for rugged HMD and viewfinder applications  

NASA Astrophysics Data System (ADS)

We present characterization of a full-color 852x3x600-pixel, active matrix organic light emitting diode (AMOLED) color microdisplay (eMagin Corporation's SVGA+ display) for environmentally demanding applications. The results show that the AMOLED microdisplay can provide cold-start turn-on and operate at extreme temperature conditions, far in excess of non-emissive displays. Correction factors for gamma response of the AMOLED microdisplay as a function of temperature have been determined to permit consistent luminance and contrast from -40°C to over +80°C. Gamma adjustments are made by a simple temperature compensation adjustment of the reference voltages of the AMOLED. The typical room temperature full-on luminance half-life of the SVGA+ full color display organic light emitting diode (OLED) display at over 3,000 hr at a starting luminance at approx. 100 cd/m2, translates to more than 15,000 hr of continuous full-motion video usage, based on a 25% duty cycle at a typical 50-60 cd/m2 commercial luminance level, or over 60,000 hr half-life in monochrome white usage, or over 100,000 hr luminance half-life in monochrome yellow usage at similar operating conditions. Half life at typical night vision luminance levels would be much longer.

Low, Kia; Jones, Susan K.; Prache, Olivier; Fellowes, David A.

2004-09-01

37

Silicide-matrix materials for high-temperature applications  

Microsoft Academic Search

Intermetallic-matrix composites are attractive alternatives to carbon\\/carbon and ceramic\\/ceramic composities for applications up to 1,600 C. Recent work on the intermetallic compounds MoSi2 and Ti5Si3 has included determination of their mechanical properties and deformation behavior, selection of thermodynamically compatible high-strength and ductile reinforcements, and strengthening and toughening mechanisms in silicide-matrix composites for high-temperature service. 11 refs.

P. J. Meschter; D. S. Schwartz

1989-01-01

38

Applications of the operational method  

SciTech Connect

New equations for continuous, operational interpolation on four plates in rectangular array are derived. The equations can be applied to the interpretation of experimental data. Other topics include convergence of operational formulas and extrapolation by operational methods. 11 refs.

Silver, G.L.

1990-11-14

39

ANALYSIS AND APPLICATIONS OF DESIGN STRUCTURE MATRIX , DOMAIN MAPPING MATRIX , AND ENGINEERING SYSTEM MATRIX FRAMEWORKS  

Microsoft Academic Search

The structure of this paper consists of three parts. Part 1 discusses three different, yet related, modeling frameworks: DSMs, DSM\\/DMMs, and ESMs. Part 2 examines the existing analysis techniques as applied to the different modeling frameworks. It also includes additional potential analysis techniques proposed for application to the three modeling frameworks. Part 3 provides a more detailed discussion of the

J. Bartolomei; M. Cokus; J. Dahlgren; J. Wilds

40

Carbon Fiber Reinforced Glass Matrix Composites for Satellite Applications.  

National Technical Information Service (NTIS)

The development of carbon fiber reinforced glass and glass-ceramic matrix composites for satellite applications is described. A variety of carbon fibers (HMU, P-100, FT700, K110OX) have been used to reinforce borosilicate glass and BMAS glass-ceramics to ...

W. K. Tredway P. H. McCluskey K. M. Prewo

1992-01-01

41

Terrorist Application of Operational Art.  

National Technical Information Service (NTIS)

The terrorist attacks committed by Osama bin Laden illustrate that he has developed the ability to apply operational art and network centric warfare to terrorism. He has clearly defined policy objectives on which he bases his strategy and focuses his atta...

M. G. Tranchemontagne

2002-01-01

42

Floating-Point Accumulation Circuit for Matrix Applications  

Microsoft Academic Search

Many scientific algorithms require floating-point reduction operations, or accumulations, including matrix-vector-multiply (MVM), vector dot-products, and the discrete cosine transform (DCT). Because FPGA implementations of each of these algorithms are desirable, it is clear that a high-performance, floatingpoint accumulation unit is necessary. However, this type of circuit is difficult to design in an FPGA environment due to the deep pipelining of

Michael R. Bodnar; John R. Humphrey; Petersen F. Curt; James P. Durbano; Dennis W. Prather

2006-01-01

43

Nucleon matrix elements of higher-twist operators from the instanton vacuum  

NASA Astrophysics Data System (ADS)

We compute the nucleon matrix elements of QCD operators of twist 3 and 4 in the instanton vacuum. We consider the operators determining 1/Q2-power corrections to the Bjorken, Ellis-Jaffe and Gross-Llewellyn-Smith sum rules. The nucleon is described as a soliton of the effective chiral theory derived from instantons in the 1Nc expansion. QCD operators involving the gluon field are systematically represented by effective operators in the effective chiral theory. We find that twist-3 matrix elements are suppressed relative to twist 4 by a power of the packing fraction of the instanton medium. Numerical results for the spin-dependent (d(2), f(2)) and spin-independent twist-3 and -4 matrix elements are compared with results of other approaches and with experimental estimates of power corrections. The methods developed can be used to evaluate a wide range of matrix elements relevant to DIS.

Balla, J.; Polyakov, M. V.; Weiss, C.

1998-01-01

44

The construction of operational matrix of fractional derivatives using B-spline functions  

NASA Astrophysics Data System (ADS)

Fractional calculus has been used to model physical and engineering processes that are found to be best described by fractional differential equations. For that reason we need a reliable and efficient technique for the solution of fractional differential equations. Here we construct the operational matrix of fractional derivative of order ? in the Caputo sense using the linear B-spline functions. The main characteristic behind the approach using this technique is that it reduces such problems to those of solving a system of algebraic equations thus we can solve directly the problem. The method is applied to solve two types of fractional differential equations, linear and nonlinear. Illustrative examples are included to demonstrate the validity and applicability of the new technique presented in the current paper.

Lakestani, Mehrdad; Dehghan, Mehdi; Irandoust-Pakchin, Safar

2012-03-01

45

Thermosetting polymer-matrix composites for structural repair applications  

NASA Astrophysics Data System (ADS)

Several classes of thermosetting polymer matrix composites were evaluated for use in structural repair applications. Initial work involved the characterization and evaluation of woven carbon fiber/epoxy matrix composites for structural pipeline repair. Cyanate ester resins were evaluated as a replacement for epoxy in composites for high-temperature pipe repair applications, and as the basis for adhesives for resin infusion repair of high-temperature composite materials. Carbon fiber/cyanate ester matrix composites and fumed silica/cyanate ester nanocomposites were evaluated for their thermal, mechanical, viscoelastic, and rheological properties as they relate to their structure, chemistry, and processing characteristics. The bisphenol E cyanate ester under investigation possesses a high glass transition temperature, excellent mechanical properties, and unique ambient temperature processability. The incorporation of fumed silica served to enhance the mechanical and rheological properties of the polymer and reduce thermal expansion without sacrificing glass transition or drastically altering curing kinetics. Characterization of the composites included dynamic mechanical analysis, thermomechanical analysis, differential scanning calorimetry, thermogravimetric analysis, rheological and rheokinetic evaluation, and transmission electron microscopy.

Goertzen, William Kirby

46

Thermosetting Polymer-Matrix Composites for Strucutral Repair Applications  

SciTech Connect

Several classes of thermosetting polymer matrix composites were evaluated for use in structural repair applications. Initial work involved the characterization and evaluation of woven carbon fiber/epoxy matrix composites for structural pipeline repair. Cyanate ester resins were evaluated as a replacement for epoxy in composites for high-temperature pipe repair applications, and as the basis for adhesives for resin infusion repair of high-temperature composite materials. Carbon fiber/cyanate ester matrix composites and fumed silica/cyanate ester nanocomposites were evaluated for their thermal, mechanical, viscoelastic, and rheological properties as they relate to their structure, chemistry, and processing characteristics. The bisphenol E cyanate ester under investigation possesses a high glass transition temperature, excellent mechanical properties, and unique ambient temperature processability. The incorporate of fumed silica served to enhance the mechanical and rheological properties of the polymer and reduce thermal expansion without sacrificing glass transition or drastically altering curing kinetics. Characterization of the composites included dynamic mechanical analysis, thermomechanical analysis, differential scanning calorimetry, thermogravimetric analysis, rheological and rheokinetic evaluation, and transmission electron microscopy.

William Kirby Goertzen

2007-12-01

47

Digitally programmable composite operational amplifier applications  

NASA Astrophysics Data System (ADS)

In this study, CMOS implementation of composite operational amplifiers onto a single chip is examined. Composite operational amplifiers are realized by interconnecting two or more single operational amplifiers in any one of four high performance circuit topologies. These high performance topologies result in composite operational amplifiers having useful bandwidths that are significantly larger than those associated with their constituent operational amplifiers without sacrificing closed loop gain. Computer simulations using PSPICE are compared with experimental results for performance evaluation. As an application, a multiple feedback bandpass filter implementation is examined.

Crowell, Ronald A.

1993-09-01

48

Unity Power Factor Operation Control Method For Single-phase to Three-phase Matrix Converter  

NASA Astrophysics Data System (ADS)

This paper proposes a new control method of matrix converter to obtain the unity power factor operation. Source side of the matrix converter is single-phase voltage, and the load side is three-phase ac motor. The number of switching device is six, and the converter does not require a reactor or an electrolytic capacitor. Generally, it is difficult for matrix converter to control both its input current waveform and the output voltage waveform, because the switching devices are connected to both source side and load side. In this paper, applying an algebraic transfer matrix, the control method of single-phase to three-phase matrix converter applies the indirect modulation model. The indirect modulation model treats a matrix converter as a two-stage transformation converter. The rectifier of proposed model consists only diode and small L-C filter. Hence, the switching frequency is lower than the conventional model one. The inverter of the proposed model regulates both the input current waveform and the motor speed. The inverter control scheme for IPM motor is based on direct torque control (DTC). The additional current controller improves its input current waveform. Hence, an optimum switching pattern of the matrix converter realizes quick torque response and unity power factor operation. This paper describes that the proposed method achieves the power factor 97.6% by experimental tests. The experimental results confirm the feasibility of the proposed method for matrix converter.

Haga, Hitoshi; Takahashi, Isao; Ohishi, Kiyoshi

49

Vector radiative transfer numerical model of coupled ocean-atmosphere system using matrix-operator method  

Microsoft Academic Search

A vector radiative transfer numerical model of the coupled ocean-atmosphere system is developed based on the matrix-operator\\u000a method, which is named PCOART. Using the Fourier analysis, the vector radiative transfer equation (VRTE) is separated into\\u000a a set of equations depending only on the observation zenith angle. Using the Gaussian-Quadrature method, VRTE is finally transferred\\u000a into the matrix equation solved by

XianQiang He; DeLu Pan; Yan Bai; QianKun Zhu; Fang Gong

2007-01-01

50

Adaptive Monte Carlo methods for matrix equations with applications  

NASA Astrophysics Data System (ADS)

This paper discusses empirical studies with both the adaptive correlated sequential sampling method and the adaptive importance sampling method which can be used in solving matrix and integral equations. Both methods achieve geometric convergence (provided the number of random walks per stage is large enough) in the sense: e[nu]<=c[lambda][nu], where e[nu] is the error at stage [nu], [lambda][set membership, variant](0,1) is a constant, c>0 is also a constant. Thus, both methods converge much faster than the conventional Monte Carlo method. Our extensive numerical test results show that the adaptive importance sampling method converges faster than the adaptive correlated sequential sampling method, even with many fewer random walks per stage for the same problem. The methods can be applied to problems involving large scale matrix equations with non-sparse coefficient matrices. We also provide an application of the adaptive importance sampling method to the numerical solution of integral equations, where the integral equations are converted into matrix equations (with order up to 8192×8192) after discretization. By using Niederreiter's sequence, instead of a pseudo-random sequence when generating the nodal point set used in discretizing the phase space [Gamma], we find that the average absolute errors or relative errors at nodal points can be reduced by a factor of more than one hundred.

Lai, Yongzeng

2009-09-01

51

Construction of fuzzy spaces and their applications to matrix models  

NASA Astrophysics Data System (ADS)

Quantization of spacetime by means of finite dimensional matrices is the basic idea of fuzzy spaces. There remains an issue of quantizing time, however, the idea is simple and it provides an interesting interplay of various ideas in mathematics and physics. Shedding some light on such an interplay is the main theme of this dissertation. The dissertation roughly separates into two parts. In the first part, we consider rather mathematical aspects of fuzzy spaces, namely, their construction. We begin with a review of construction of fuzzy complex projective spaces CP k (k = 1, 2, · · ·) in relation to geometric quantization. This construction facilitates defining symbols and star products on fuzzy CPk. Algebraic construction of fuzzy CPk is also discussed. We then present construction of fuzzy S 4, utilizing the fact that CP3 is an S2 bundle over S4. Fuzzy S4 is obtained by imposing an additional algebraic constraint on fuzzy CP3. Consequently it is proposed that coordinates on fuzzy S4 are described by certain block-diagonal matrices. It is also found that fuzzy S8 can analogously be constructed. In the second part of this dissertation, we consider applications of fuzzy spaces to physics. We first consider theories of gravity on fuzzy spaces, anticipating that they may offer a novel way of regularizing spacetime dynamics. We obtain actions for gravity on fuzzy S2 and on fuzzy CP3 in terms of finite dimensional matrices. Application to M(atrix) theory is also discussed. With an introduction of extra potentials to the theory, we show that it also has new brane solutions whose transverse directions are described by fuzzy S 4 and fuzzy CP3. The extra potentials can be considered as fuzzy versions of differential forms or fluxes, which enable us to discuss compactification models of M(atrix) theory. In particular, compactification down to fuzzy S4 is discussed and a realistic matrix model of M-theory in four-dimensions is proposed.

Abe, Yasuhiro

52

Linear circuit applications of operational amplifiers  

Microsoft Academic Search

Some of the most frequently encountered linear circuit applications of operational amplifiers are discussed in this article. Included are details of differential dc amplifiers, bridge amplifiers, analog integrators, differentiators, line-driving amplifiers, ac coupled feedback amplifiers, current-to-voltage converters, reference-voltage sources, voltage regulators, current amplifiers, and charge amplifiers.

Larry L. Schick

1971-01-01

53

Matrix elements of four-quark operators and ?L=2 hyperon decays  

NASA Astrophysics Data System (ADS)

The study of neutrinoless double beta decays of nuclei and hyperons requires the calculation of hadronic matrix elements of local four-quark operators that change the total charge by two units ?Q=2. Using a low energy effective Lagrangian that induces these transitions, we compute these hadronic matrix elements in the framework of the Massachussetts Institute of Technology bag model. As an illustrative example we evaluate the amplitude and transition rate of ?-?pe-e-, a decay process that violates lepton number by two units (?L=2). The relevant matrix element is evaluated without assuming the usual factorization approximation of the four-quark operators and the results obtained in both approaches are compared.

Barbero, C.; Li, Ling-Fong; López Castro, G.; Mariano, A.

2013-02-01

54

Inverse spectral problems for Sturm-Liouville operators with matrix-valued potentials  

NASA Astrophysics Data System (ADS)

We give a complete description of the set of spectral data (eigenvalues and specially introduced norming constants) for Sturm-Liouville operators on the interval [0, 1] with matrix-valued potentials in the Sobolev space W-12 and suggest an algorithm reconstructing the potential from the spectral data that is based on Krein's accelerant method.

Mykytyuk, Ya V.; Trush, N. S.

2010-01-01

55

Radiative transfer in an atmosphere-ocean system: A matrix operator approach  

Microsoft Academic Search

Air water interactions, Radiative transfer, Mathematical analysis, Matrices Mathematics, Radiance, Rayleigh scattering, Dielectrics, Computations, Transfer functions, Albedo, Mapping Transformations. It is the purpose of this paper to demonstrate how the matrix operator method can be effectively implemented to couple the radiation fields of the atmosphere and ocean. Azimuthally averaged radiances and irradiances are presented as a function of optical depth

G. W. Kattawar; T. J. Humphreys; G. N. Plass

1978-01-01

56

Nondestructive damage evaluation in ceramic matrix composites for aerospace applications.  

PubMed

Infrared thermography (IRT) and acoustic emission (AE) are the two major nondestructive methodologies for evaluating damage in ceramic matrix composites (CMCs) for aerospace applications. The two techniques are applied herein to assess and monitor damage formation and evolution in a SiC-fiber reinforced CMC loaded under cyclic and fatigue loading. The paper explains how IRT and AE can be used for the assessment of the material's performance under fatigue. IRT and AE parameters are specifically used for the characterization of the complex damage mechanisms that occur during CMC fracture, and they enable the identification of the micromechanical processes that control material failure, mainly crack formation and propagation. Additionally, these nondestructive parameters help in early prediction of the residual life of the material and in establishing the fatigue limit of materials rapidly and accurately. PMID:23935428

Dassios, Konstantinos G; Kordatos, Evangelos Z; Aggelis, Dimitrios G; Matikas, Theodore E

2013-07-11

57

Financial Applications of Random Matrix Theory: Old Laces and New Pieces  

Microsoft Academic Search

This contribution to the proceedings of the Cracow meeting on `Applications of Random Matrix Theory' summarises a series of studies, some old and others more recent on financial applications of Random Matrix Theory (RMT). We first review some early results in that field, with particular emphasis on the applications of correlation cleaning to portfolio optimisation, and discuss the extension of

Marc Potters; Jean-Philippe Bouchaud; Laurent Laloux

2005-01-01

58

Matrix assisted ionization in vacuum, a sensitive and widely applicable ionization method for mass spectrometry.  

PubMed

An astonishingly simple new method to produce gas-phase ions of small molecules as well as proteins from the solid state under cold vacuum conditions is described. This matrix assisted ionization vacuum (MAIV) mass spectrometry (MS) method produces multiply charged ions similar to those that typify electrospray ionization (ESI) and uses sample preparation methods that are nearly identical to matrix-assisted laser desorption/ionization (MALDI). Unlike these established methods, MAIV does not require a laser or voltage for ionization, and unlike the recently introduced matrix assisted ionization inlet method, does not require added heat. MAIV-MS requires only introduction of a crystalline mixture of the analyte incorporated with a suitable small molecule matrix compound such as 3-nitrobenzonitrile directly to the vacuum of the mass spectrometer. Vacuum intermediate pressure MALDI sources and modified ESI sources successfully produce ions for analysis by MS with this method. As in ESI-MS, ion formation is continuous and, without a laser, little chemical background is observed. MAIV, operating from a surface offers the possibility of significantly improved sensitivity relative to atmospheric pressure ionization because ions are produced in the vacuum region of the mass spectrometer eliminating losses associated with ion transfer from atmospheric pressure to vacuum. Mechanistic aspects and potential applications for this new ionization method are discussed. PMID:23526166

Trimpin, Sarah; Inutan, Ellen D

2013-03-23

59

operational applications of high accuracy lighting data  

NASA Astrophysics Data System (ADS)

Lightning data has long benefited from high resolution measurement, typically giving location accuracy better than 1km and time resolution in the millisecond range. Lightning products can be available in continuous real time data flows or as images updated every minute. Those characteristics, linked to the very nature of the flash discharge, are key to some application of lighting data in operational conditions. The presentation will demonstrate the importance of those characteristics in fields ranging from power line management, to airport operation or outdoor activity risk handling. We will show how high resolution contributes to make lighting data a complement to other available meteorological information.

Bonnet, M.

2009-09-01

60

Hanford Site air operating permit application  

SciTech Connect

The Clean Air Act Amendments of 1990, which amended the Federal Clean Air Act of 1977, required that the US Environmental Protection Agency develop a national Air Operating Permit Program, which in turn would require each state to develop an Air Operating Permit Program to identify all sources of ``regulated`` pollutants. Regulated pollutants include ``criteria`` pollutants (oxides of nitrogen, sulfur oxides, total suspended particulates, carbon monoxide, particulate matter greater than 10 micron, lead) plus 189 other ``Hazardous`` Air Pollutants. The Hanford Site, owned by the US Government and operated by the US Department of Energy, Richland Operations Office, is located in southcentral Washington State and covers 560 square miles of semi-arid shrub and grasslands located just north of the confluence of the Snake and Yakima Rivers with the Columbia River. This land, with restricted public access, provides a buffer for the smaller areas historically used for the production of nuclear materials, waste storage, and waste disposal. About 6 percent of the land area has been disturbed and is actively used. The Hanford Site Air Operating Permit Application consists of more than 1,100 sources and in excess of 300 emission points. Before January 1995, the maintenance and operations contractor and the environmental restoration contractor for the US Department of Energy completed an air emission inventory on the Hanford Site. The inventory has been entered into a database so that the sources and emission points can be tracked and updated information readily can be retrieved. The Hanford Site Air Operating Permit Application contains information current as of April 19, 1995.

NONE

1995-05-01

61

36 CFR 1194.21 - Software applications and operating systems.  

Code of Federal Regulations, 2010 CFR

... Software applications and operating systems. 1194.21 Section 1194... Software applications and operating systems. (a) When software is designed...disable activated features of any operating system that are identified as...

2009-07-01

62

36 CFR 1194.21 - Software applications and operating systems.  

Code of Federal Regulations, 2010 CFR

... Software applications and operating systems. 1194.21 Section 1194... Software applications and operating systems. (a) When software is designed...disable activated features of any operating system that are identified as...

2010-07-01

63

Tensor operators: Constructions and applications for long-range interaction systems  

Microsoft Academic Search

We consider the representation of operators in terms of tensor networks and their application to the ground-state approximation and time evolution of systems with long-range interactions. We provide an explicit construction to represent an arbitrary many-body Hamilton operator in terms of a one-dimensional tensor network (i.e., as a matrix product operator). For pairwise interactions, we show that such a representation

F. Froewis; V. Nebendahl; W. Duer

2010-01-01

64

On the fine spectrum of the operator defined by a lambda matrix over the sequence space c0 and c  

NASA Astrophysics Data System (ADS)

The main purpose of this paper is to determine the fine spectrum with respect to Goldberg's classification of the operator defined by a lambda matrix over the sequence spaces c0 and c. As a new development, we give the approximate point spectrum, defect spectrum and compression spectrum of the matrix operator Lambda on the sequence spaces c0 and c.

Ye?ilkayagil, Medine; Ba?ar, Feyzi

2012-08-01

65

Matrix coordinate Bethe Ansatz: applications to XXZ and ASEP models  

NASA Astrophysics Data System (ADS)

We present the construction of the full set of eigenvectors of the open asymmetric simple exclusion process (ASEP) and XXZ models with special constraints on the boundaries. The method combines both recent constructions of coordinate Bethe Ansatz and the old method of matrix Ansatz specific to the ASEP. This ‘matrix coordinate Bethe Ansatz’ can be viewed as a non-commutative coordinate Bethe Ansatz, the non-commutative part being related to the algebra appearing in the matrix Ansatz.

Crampe, N.; Ragoucy, E.; Simon, D.

2011-10-01

66

K??? hadronic matrix elements of left-right current-current operators  

NASA Astrophysics Data System (ADS)

Effective ?S=1 four-fermion operators involving left- and right-handed currents are relevant in left-right gauge extensions of the Standard Model and scalar extension of the Yukawa sector. They induce K??? decays which are strictly constrained by experimental data, typically resulting in strong bounds on the new physics scales or parameters. We evaluate the K??? hadronic matrix elements of such operators within the phenomenological framework of the chiral quark model. The results are consistent with the estimates used in a previous work on TeV scale left-right symmetry, thus confirming the conclusions obtained there.

Bertolini, Stefano; Maiezza, Alessio; Nesti, Fabrizio

2013-08-01

67

Fuzzy geometry via the spinor bundle, with applications to holographic space-time and matrix theory  

SciTech Connect

We present a new framework for defining fuzzy approximations to geometry in terms of a cutoff on the spectrum of the Dirac operator, and a generalization of it that we call the Dirac-flux operator. This framework does not require a symplectic form on the manifold, and is completely rotation invariant on an arbitrary n-sphere. The framework is motivated by the formalism of holographic space-time, whose fundamental variables are sections of the spinor bundle over a compact Euclidean manifold. The strong holographic principle requires the space of these sections to be finite dimensional. We discuss applications of fuzzy spinor geometry to holographic space-time and to matrix theory.

Banks, Tom [NHETC and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019 (United States); SCIPP and Department of Physics, University of California, Santa Cruz, California 95064-1077 (United States); Kehayias, John [SCIPP and Department of Physics, University of California, Santa Cruz, California 95064-1077 (United States)

2011-10-15

68

Matrix coordinate Bethe Ansatz: applications to XXZ and ASEP models  

Microsoft Academic Search

We present the construction of the full set of eigenvectors of the open asymmetric simple exclusion process (ASEP) and XXZ models with special constraints on the boundaries. The method combines both recent constructions of coordinate Bethe Ansatz and the old method of matrix Ansatz specific to the ASEP. This `matrix coordinate Bethe Ansatz' can be viewed as a non-commutative coordinate

N. Crampe; E. Ragoucy; D. Simon

2011-01-01

69

Application of Inorganic SIAL Matrix and Movable Technology in Solidification of the TRU Sludges and Sludge/Resin Mixtures  

SciTech Connect

The inorganic SIAL matrix for immobilization and solidification of radioactive waste was developed by AllDeco Company. The SIAL matrix is the product of polycondensation of inorganic compounds. Process of immobilization and solidification is running at room temperature. The application of the SIAL matrix was performed on various types of radioactive sludges, resins and sludge/resin mixtures from NPPs. Laboratory tests on waste fixed in the SIAL matrix have shown results with compressive strengths of the final product from 20 to 25 MPa and the indexes of leachability from 9 to 18. Different tailored mobile and remotely operated devices were designed and manufactured for the application of the SIAL matrix. Devices for the solidification are relatively small, lightweight and designed for the application on site, directly 'in situ' or near localized sludges or resin occurrences. The solidification of sludge/resin mixtures was realized into 60-liter or 200-liter drums. Also TRU radioactive sludges were solidified 'in situ' in original canisters used for storage and cooling of spent fuel assemblies. (authors)

Majersky, D.; Sekely, S.; Zavodska, D.; Breza, M. [AllDeco, 919 31 Jaslovske Bohunice (Slovakia)

2006-07-01

70

Some applications of the matrix symbolism in the adjustment  

Microsoft Academic Search

The classical matrix (mhmlus whi(:h is due to CAYLEY is intended to be employed on systems of linear equations. Therefore it is no wonder that the method of least squaces with great advantage may be expressed by means of the matrix symbols. A great literature o,l adjustment t)roblems using the mah'iees as tools has appeared. In the list of references

Henry Jensen

1950-01-01

71

Application of the J-matrix method to multichannel scattering  

NASA Astrophysics Data System (ADS)

In this contribution we describe the multichannel extension to the nonrelativistic J-matrix method, and present differential cross sections for scattering of slow electrons from Argon atoms. Nonrelativistic phase shifts, then the S-matrix and the cross sections have been calculated using newly developed Fortran code, JMATRIX-MULTI. We applied the model Hartree-Fock potential as the scattering potential, which was truncated in the oscillatory basis functions.

Syty, P.; Redynk, ?.; Sienkiewicz, J. E.

2013-10-01

72

Evaluation of the Trajectory Operations Applications Software Task (TOAST).  

National Technical Information Service (NTIS)

The Trajectory Operations Applications Software Task (TOAST) is a software development project under the auspices of the Mission Operations Directorate. Its purpose is to provide trajectory operation pre-mission and real-time support for the Space Shuttle...

S. Perkins A. Martin B. Bavinger

1990-01-01

73

Structural and functional polymer-matrix composites for electromagnetic applications  

NASA Astrophysics Data System (ADS)

This dissertation addresses the science and technology of functional and structural polymer-matrix composite materials for electromagnetic applications, which include electromagnetic interference (EMI) shielding and low observability (Stealth). The structural composites are continuous carbon fiber epoxy-matrix composites, which are widely used for airframes. The functional composites are composites with discontinuous fillers and in both bulk and coating forms. Through composite structure variation, attractive electromagnetic properties have been achieved. With no degradation of the tensile strength or modulus, the shielding effectiveness of the structural composites has been improved by enhancing multiple reflections through light activation of the carbon fiber. The multiple reflections loss of the electromagnetic wave increases from 1.1 to 10.2 dB at 1.0 GHz due to the activation. Such a large effect of multiple reflections has not been previously reported in any material. The observability of these composites has been lowered by decreasing the electrical conductivity (and hence decreasing the reflection loss) through carbon fiber coating. The incorporation of mumetal, a magnetic alloy particulate filler (28-40 mum size), in a latex paint has been found to be effective for enhancing the shielding only if the electrical resistivity of the resulting composite coating is below 10 O.cm, as rendered by a conductive particulate filler, such as nickel flake (14-20 mum size). This effectiveness (39 dB at 1.0 GHz) is attributed to the absorption of the electromagnetic wave by the mumetal and the nickel flake, with the high conductivity rendered by the presence of the nickel flake resulting in a relatively high reflection loss of 15.5 dB. Without the nickel flake, the mumetal gives only 3 dB of shielding and 1.5 dB of reflection loss at 1.0 GHz. Nickel powder (0.3-0.5 mum size) has been found to be an effective filler for improving the shielding of polyethersulfone (PES) bulk composites. At 13 vol.%, it gives 90 dB of shielding at 1.0 GHz, compared to 46 dB for nickel powder (20-40 mum) and the prior value of 87 dB reported by Shui and Chung for nickel filament (0.4 mum diameter). The minimum filler content for high shielding is 7-13 vol.% for both nickel powders, compared to 3-7 vol.% for nickel filament. Due to the skin effect, a small filler unit size helps the shielding, which is dominated by reflection. Carbon filament (0.1 mum, >100 mum long, >1000 in aspect ratio) is effective for enhancing the shielding effectiveness of a coating made from a water-based colloid that contains graphite particle (0.7-0.8 mum, 22 wt.%) and a starch-type binder. The filament addition increases the shielding from 11 to 20 dB at 1.0 GHz. This increase in shielding is associated with increase in reflectivity and decrease in electrical resistivity. Graphite flake (5 mum) at the same volume proportion is even more effective; its addition increases the shielding from 11 to 28 dB. The combined use of the graphite flake and a low proportion of stainless steel fiber (11 mum diameter, 2 mm long, 180 in aspect ratio) is yet more effective; it increases the shielding from 11 to 34 dB. Alumina particle (5 mum size, 15 vol.%) is effective for increasing the impedance of a coating made from the graphite colloid by 290%, though the shielding effectiveness is reduced from 18 to 11 dB at 1.0 GHz. The high impedance is attractive for MRIcompatible pacemaker leads. The interface between filler and matrix also affects the shielding. Silane treatment of the surface of graphite flake (5 mum) used in the graphite colloid decreases the viscosity (e.g., from 1750 to 1460 CP), but it also decreases the shielding effectiveness (e.g., from 20 to 16 dB at 1 GHz). Ozone treatment gives a similar effect. The decrease of the shielding effectiveness is attributed to the increase in resistivity due to the surface treatment. Measured and calculated values of the reflection loss are comparable, with the measured value lower than the corresponding calculated value, when th

Wu, Junhua

74

Ceramic matrix composites application in automotive gas turbines  

Microsoft Academic Search

The authors are conducting the development of ceramic matrix composites (CMC) and components made of CMC for a 100 kW automotive ceramic gas turbine (CGT). When compared to monolithic ceramics (MC), CMC that they have developed demonstrate superior strength characteristics in terms of resistance to particle impact and thermal shock. The authors have conducted evaluation tests on the strength of

Takao Izumi; Hiroshi Kaya

1997-01-01

75

The Application of Risk Matrix to Software Project Risk Management  

Microsoft Academic Search

Risk management and performance enhancement have always been the focus of software project management studies. This paper give basic concepts of risk management, analyzed the four stage of risk management in acquisition process. overview the three steps method of risk matrix, summarize the 14 categories and 82 factors of software project risks, then the paper, beginning with the use the

Li Xiaosong; Liu Shushi; Cai Wenjun; Feng Songjiang

2009-01-01

76

Combining multiple single-reference transmissibility functions in a unique matrix formulation for operational modal analysis  

NASA Astrophysics Data System (ADS)

In recent years, the authors have proposed an innovative approach for Operational Modal Analysis based on transmissibility measurements. A method was proposed based on combining 2 single-reference transmissibility functions that were obtained during 2 different loading conditions. However in practice one in general has access to multiple transmissibility functions and perhaps even multiple loading conditions. In this paper a new method is introduced that combines all the measured single-reference transmissibility functions in a unique matrix formulation in order to identify system poles. It will be shown that each element of the pseudo-inverse of this matrix is a rational function with poles equal to the system poles. The proposed method reduces the risk to miss system poles and to identify extra non-physical poles. Therefore the method increases the usability and reliability of transmissibility based operational modal analysis (TOMA). The method will be demonstrated and validated by means of an experiment on a beam excited at multiple inputs for three different loading conditions.

Devriendt, C.; Weijtjens, W.; De Sitter, G.; Guillaume, P.

2013-10-01

77

Properties of Graphite Fiber Reinforced Copper Matrix Composites for Space Power Applications.  

National Technical Information Service (NTIS)

The thermal and mechanical properties of pitch-based graphite fiber reinforced copper matrix (Gr/Cu) composites usable for space applications such as radiator fins were investigated. Thermal conductivity was measured as a function of fiber volume fraction...

D. L. Ellis

1992-01-01

78

Potential application of ceramic matrix composites to aero-engine components  

Microsoft Academic Search

The present paper describes the potential application of ceramic matrix composites to aero-engine components by reviewing the related published papers and our experience in this field. It contains the material requirements for aero-engines, trends in aero-engine materials use, Japanese projects related to ceramic matrix composites (CMCs) and potential application of CMCs to aero-engines, such as combustors, nozzle flaps, bladed disks

Hisaichi Ohnabe; Shoju Masaki; Masakazu Onozuka; Kaoru Miyahara; Tadashi Sasa

1999-01-01

79

Two-loop operator matrix elements calculated up to finite terms for polarized deep inelastic lepton-hadron scattering  

NASA Astrophysics Data System (ADS)

We present the two-loop corrected operator matrix elements contributing to the scale evolution of the longitudinal spin structure function g1(x,Q2) calculated up to finite terms which survive in the limit ?=N-4-->0. These terms are needed to renormalize the local operators up to third order in the strong coupling constant ?s. Further the expressions for the two-loop corrected operator matrix elements can be inserted into one loop graphs to obtain a part of the third order contributions to these matrix elements. This work is a first step in obtaining the third order anomalous dimensions so that a complete next-to-next-to-leading order analysis of the above-mentioned structure function can be carried out. In our calculation particular attention is paid to the renormalization constant which is needed to restore the Ward identities violated by the HVBM prescription for the ?5 matrix in N-dimensional regularization.

Matiounine, Y.; Smith, J.; van Neerven, W. L.

1998-10-01

80

Evaluating wilderness recreational opportunities: Application of an impact matrix  

NASA Astrophysics Data System (ADS)

An inventory of the severity and spatial distribution of wilderness campsite impacts in Sequoia and Kings Canyon National Parks identified a total of 273 distinct nodes of campsites or “management areas.” A campsite impact matrix was developed to evaluate management areas based on total impacts (correlated to the total area of campsite development) and the density, or concentration, of impacts relative to each area's potentially campable area. The matrix is used to quantify potential recreational opportunities for wilderness visitors in a spectrum from areas offering low impact-dispersed camping to those areas offering high impact-concentrated camping. Wilderness managers can use this type of information to evaluate use distribution patterns, identify areas to increase or decrease use, and to identify areas needing site-specific regulations (e.g., one-night camping limits) to preserve wilderness resources and guarantee outstanding opportunities for solitude.

Stohlgren, Thomas J.; Parsons, David J.

1992-05-01

81

Spectral properties of contact matrix: application to proteins.  

PubMed

A protein can be modelled by a set of points representing its amino acids. Topologically, this set of points is entirely defined by its contact matrix (adjacency matrix in graph theory). The contact matrix characterizing the relation between neighboring amino acids is deduced from Voronoi or Laguerre decomposition. This method allows contact matrices to be defined without any arbitrary cut-off that could induce arbitrary effects. Eigenvalues of these matrices are related with elementary excitations in proteins. We present some spectral properties of these matrices that reflect global properties of proteins. The eigenvectors indicate participation of each amino acids to the excitation modes of the proteins. It is interesting to compare the protein modelled as a close packing of amino acids, with a random close packing of spheres. The main features of the protein are those of a packing, a result that confirms the importance of the dense packing model for proteins. Nevertheless there are some properties, specific to the hierarchical organization of the protein: the primary chain order, the secondary structures and the domain structures. PMID:16292476

Sadoc, J F

2005-11-15

82

Magnet operating experience review for fusion applications.  

National Technical Information Service (NTIS)

This report presents a review of magnet operating experiences for normal-conducting and superconducting magnets from fusion, particle accelerator, medical technology, and magnetohydrodynamics research areas. Safety relevant magnet operating experiences ar...

L. C. Cadwallader

1991-01-01

83

Partial Differential Equations, Operator Theory and Applications.  

National Technical Information Service (NTIS)

The senior investigators on this grant have been active in the following subjects: Cordes has been working on algebras of operators which include partial differential operators as special cases. In particular, he has made detailed investigations of the sy...

M. H. Protter

1968-01-01

84

Magnet operating experience review for fusion applications  

Microsoft Academic Search

This report presents a review of magnet operating experiences for normal-conducting and superconducting magnets from fusion, particle accelerator, medical technology, and magnetohydrodynamics research areas. Safety relevant magnet operating experiences are presented to provide feedback on field performance of existing designs and to point out the operational safety concerns. Quantitative estimates of magnet component failure rates and accident event frequencies are

Cadwallader

1991-01-01

85

Pseudo-Random Operators: Theory and Applications  

NASA Astrophysics Data System (ADS)

Pseudo-random operators consist of sets of operators that exhibit important statistical features of uniformly distributed operators although their parametrization and generation requires exponentially fewer resources. Pseudo-random operators can be applied for quantum communication tasks such as data-hiding and super-dense coding of quantum states, and enable efficient stochastic methods for noise estimation on prototype quantum processors. This paper summarizes published work by Emerson et al. [Science 302:2098 (2003)] demonstrating a random circuit method for the implementation of pseudo-random unitary operators on a quantum processor and some more recent related results.

Emerson, Joseph

2004-11-01

86

Geometric Applications of a Matrix-Searching Algorithm  

Microsoft Academic Search

LetA be a matrix with real entries and letj(i) be the index of the leftmost column containing the maximum value in rowi ofA.A is said to bemonotone ifi\\u000a 1 >i\\u000a 2 implies thatj(i\\u000a 1) ?J(i\\u000a 2).A istotally monotone if all of its submatrices are monotone. We show that finding the maximum entry in each row of an arbitraryn xm monotone

Alok Aggarwal; Maria M. Klawe; Shlomo Moran; Peter W. Shor; Robert E. Wilber

1987-01-01

87

Magnet operating experience review for fusion applications  

SciTech Connect

This report presents a review of magnet operating experiences for normal-conducting and superconducting magnets from fusion, particle accelerator, medical technology, and magnetohydrodynamics research areas. Safety relevant magnet operating experiences are presented to provide feedback on field performance of existing designs and to point out the operational safety concerns. Quantitative estimates of magnet component failure rates and accident event frequencies are also presented, based on field experience and on performance of similar components in other industries.

Cadwallader, L.C.

1991-11-01

88

Operational options to reduce matrix effects in liquid chromatography–electrospray ionisation-mass spectrometry analysis of aqueous environmental samples  

Microsoft Academic Search

Matrix effects like signal enhancement or suppression can severely compromise quantitative analysis of environmental samples with liquid chromatography–electrospray ionization–mass spectrometry (LC–ESI–MS). Several operational options were studied to reduce such matrix effects in the determination of polar organic trace contaminants from water, like non-steroidal anti-inflammatory drugs, among them ibuprofen, diclofenac and naproxen, lipid regulators like bezafibrate and clofibric acid and industrial

Achim Kloepfer; José Benito Quintana; Thorsten Reemtsma

2005-01-01

89

The synthesis, compressive properties, and applications of metal matrix syntactic foams  

NASA Astrophysics Data System (ADS)

Metal matrix syntactic foams are composites that incorporate hollow particles in a matrix, where enclosing porosity inside the thin shell of the particle leads to low density without large decreases in mechanical properties. Studies on Al, Mg, Pb, and Zn alloy matrix syntactic foams are available in the published literature. A large stress plateau region appears in the compressive stress-strain graphs of metal matrix syntactic foams. The height and length of stress plateau can be tailored by means of particle wall thickness, volume fraction, and size, and the total compressive energy absorption can be controlled. Metal matrix syntactic foams seem promising in various energy absorbing applications including automobile parts since their energy absorption capability per unit weight is better than other foams and lightweight materials.

Rohatgi, Pradeep K.; Gupta, Nikhil; Schultz, Benjamin F.; Luong, Dung D.

2011-02-01

90

Two-step matrix application for the enhancement and imaging of latent fingermarks.  

PubMed

Matrix deposition is a crucial aspect for successful matrix-assisted laser desorption ionization mass spectrometry imaging (MALDI MSI) analysis. The search for more efficient protocols over the years has resulted in the devising of "dry matrix methods" in which the matrix is solely or preliminarily deposited as powder and acts in most cases as a seeding agent. Although not fully embraced by the MALDI MSI community, these methods have proven to be more efficient in terms of ion intensity, ion abundance, and ion images in the experimental circumstances they were employed. Here we report a novel two-step matrix application method, that we have named the "dry-wet" method, where the matrix is dusted onto the sample followed by solvent spray using a robotic device. The new method has been successfully applied to the detection and mapping of several analyte classes within latent fingermarks. Dusting the matrix generated the added advantage of enhancing the latent fingermarks which are invisible. This allows not only for an optical image to be taken of the fingermark in situ but also bridges the gap in the application of MALDI MSI technology in this field; with the use of the methodology reported, fingermark enhancement, recovery, and analysis from different surfaces is now compatible with subsequent MALDI MSI analysis thus allowing visual and chemical information to be obtained simultaneously. PMID:21667965

Ferguson, L; Bradshaw, R; Wolstenholme, R; Clench, M; Francese, S

2011-06-13

91

Boron-bearing species in ceramic matrix composites for long-term aerospace applications  

Microsoft Academic Search

Boron-bearing refractory species are introduced in non-oxide ceramic matrix fibrous composites (such as SiC\\/SiC composites) to improve their oxidation resistance under load at high temperatures with a view to applications in the aerospace field. B-doped pyrocarbon and hex-BN have been successfully used as interphase (instead of pure pyrocarbon) either as homogeneous or multilayered fiber coatings, to arrest and deflect matrix

R. Naslain; A. Guette; F. Rebillat; R. Pailler; F. Langlais; X. Bourrat

2004-01-01

92

Sublimation as a method of matrix application for mass spectrometric imaging  

Microsoft Academic Search

Common organic matrix-assisted laser desorption\\/ionization (MALDI) matrices, 2,5-dihydroxybenzoic acid, 3,5-dimethoxy-4-hydroxycinnamic\\u000a acid, and ?-cyano-4-hydroxycinnamic acid, were found to undergo sublimation without decomposition under conditions of reduced pressure\\u000a and elevated temperature. This solid to vapor-phase transition was exploited to apply MALDI matrix onto tissue samples over\\u000a a broad surface in a solvent-free application for mass spectrometric imaging. Sublimation of matrix produced an

Joseph A. Hankin; Robert M. Barkley; Robert C. Murphy

2007-01-01

93

Strategic Leadership Development: An Operation Domain Application.  

National Technical Information Service (NTIS)

The leaders of tomorrow's military will be faced not only with more complex technologically but will function in an environment of joint operations. In this environment members from sister services will be brought together toward the goals of planning and...

B. Hatfield

1997-01-01

94

PRINCIPLES AND APPLICATIONS OF OPERATIONS RESEARCH  

Microsoft Academic Search

This chapter will provide an overview of Operations Research (O.R.) from the perspective of an industrial engineer. The focus of the chapter is on the basic philosophy behind O.R. and the so-called \\

Jayant Rajgopal

95

Operations research applications in the plywood industry  

Microsoft Academic Search

There are several areas in the plywood industry where Operations Research techniques have greatly assisted in better decision-making.\\u000a These have resulted in improved profits, reduction of wood losses and better utilization of resources. Realizing these, some\\u000a of the plywood manufacturing firms in the developed countries have established separate Operations Research departments or\\u000a divisions. In the face of limited raw-material resources,

B. G. Raghavendra

1987-01-01

96

Intermetallic and titanium matrix composite materials for hypersonic applications  

SciTech Connect

As part of the French Program of Research and Technology for Advanced Hypersonic Propulsion (PREPHA) which was launched in 1992 between Aerospatiale, Dassault Aviation, ONERA, SNECMA and SEP, an important work is specially devoted to the development of titanium and intermetallic composite materials for large airframe structures. At Dassault Aviation, starting from a long experience in Superplastic Forming - Diffusion Bonding (SPF-DB) of titanium parts, the effort is brought on the manufacturing and characterization of composites made from Timet beta 21S or IMI 834 foils and Textron SCS6 fiber fabrics. At `Aersopatiale Espace & Defence`, associated since a long time about intermetallic composite materials with university research laboratories, the principal effort is brought on plasma technology to develop the gamma titanium aluminide TiAl matrix composite reinforced by protected silicon carbide fibers (BP SM 1240 or TEXTRON SCS6). The objective, is to achieve, after 3 years of time, to elaborate a medium size integrally stiffened panel (300 x 600 sq mm).

Berton, B.; Surdon, G.; Colin, C. [Dassault Aviation, Saint-Cloud (France)]|[Aersopatiale Space & Defence, St Medard en Jalles (France)

1995-09-01

97

Applications of real-time matrix-acidizing evaluation method  

SciTech Connect

A new technique for real-time matrix-acidizing job evaluation has recently been presented that uses reservoir transients during acid injection to simulate pressure response of the unperturbed reservoir and compares simulated pressures with measured values. The difference between these values is attributed to the changing skin effect. An associated pretreatment injection/falloff test is presented as an essential element of that method. It involves injection of an inert fluid (water or reservoir oil) and analysis of the ensuing falloff for a period during which pumping has stopped just before acid enters the perforations. Injection resumes immediately thereafter. Two field case studies, a water-injection well in a fissured carbonate reservoir and an oil well completed in a sandstone reservoir, demonstrate the technique. For both treatments, conclusions are drawn regarding the effectiveness of the acid injection. The job evolution is demonstrated, and forecasts of expected well performance for unstimulated and stimulated cases are presented. The skin evolution is shown as a function of injection time. The simulated and measured pressure values for both treatments are shown, indicating the real-time job progression.

Prouvost, L.P.; Economides, M.J. (Dowell Schlumberger (US))

1989-11-01

98

Reduced density matrix hybrid approach: Application to electronic energy transfer  

SciTech Connect

Electronic energy transfer in the condensed phase, such as that occurring in photosynthetic complexes, frequently occurs in regimes where the energy scales of the system and environment are similar. This situation provides a challenge to theoretical investigation since most approaches are accurate only when a certain energetic parameter is small compared to others in the problem. Here we show that in these difficult regimes, the Ehrenfest approach provides a good starting point for a dynamical description of the energy transfer process due to its ability to accurately treat coupling to slow environmental modes. To further improve on the accuracy of the Ehrenfest approach, we use our reduced density matrix hybrid framework to treat the faster environmental modes quantum mechanically, at the level of a perturbative master equation. This combined approach is shown to provide an efficient and quantitative description of electronic energy transfer in a model dimer and the Fenna-Matthews-Olson complex and is used to investigate the effect of environmental preparation on the resulting dynamics.

Berkelbach, Timothy C.; Reichman, David R. [Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027 (United States); Markland, Thomas E. [Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, California 94305 (United States)

2012-02-28

99

The labour force matrix of Pakistan: selected applications.  

PubMed

This paper develops and estimates a labor force matrix (LFM) for Pakistan, which is shown to be a new and very useful tool in describing the multi-dimensional nature of the work force and its dynamic characteristics over time. The paper then uses the LFM as a guideline in the simulation of the labor force in the 6th Five-Year Plan. The LFM allows one to read the number of persons who belong to a specific combination of location, status, sector, occupation, and education, and is, therefore, superior to 2-dimensional cross-tabulations. Under plausible assumptions, such matrices have been constructed from published data of the labor surveys of 1977-1978 and 1982-1983 and projected to 1988. The authors simulated the 6th Plan by means of a model which forecasts demand and supply and generates a planned LFM for 1988. A comparison between the 2 matrices shows that on the whole the plan does not predict major surprises in the structure of the labor force. Concurrently, the results suggest some future unresolved shortage-imbalances for production workers and the lowest educational levels and some surpluses of a frictional nature in the upper skills and educational levels. Even though the apparent recommendations for balancing the labor force may be more vocational training, a higher rate of primary school enrollment and fewer primary school dropouts, and job upgrading at the higher end of skills and education, a complementary analysis is required before sensible conclusions can be drawn. Besides, a disaggregation into many more occupations and short-term labor market signals as regards trends in vacancies and relative earnings are indispensable in complementing the obtained picture. PMID:12340756

Cohen, S I

100

Positivity of elliptic difference operators and its applications  

NASA Astrophysics Data System (ADS)

In the present paper, we consider the difference operator (-1)n?hp2n+Ahp, where Ahp is the self-adjoint positive definite operator in L2h. The positivity of this difference operator in the Holder spaces is established. In applications, the well-posedness of the initial-boundary value problem for the parabolic difference equation is established.

Semenova, Galina E.

2012-08-01

101

The Operator Manifold Formalism. II. Physical Applications  

Microsoft Academic Search

Within the operator manifold approach (part I, hep-th\\/9812181) we derive the\\u000aGell-Mann-Nishijima relation and flavour group, whereas the leptons are\\u000aparticles with integer electric and leptonic charges and free of confinement,\\u000awhile quarks carry fractional electric and baryonic charges and imply the\\u000aconfinement. We consider the unified electroweak interactions with small number\\u000aof free parameters, exploit the background of the

G. T. Ter-Kazarian

1998-01-01

102

Matrix Simulation  

NSDL National Science Digital Library

This applet simulates the operation of a 2x2 matrix geometrically. The simulation shows a 2D image of the transformation of unit vectors due to the matrix. It displays the values of the matrix coefficients, the eigenvectors and the determinant. The matrix can be transposed, inverted or rotated. The page also includes an extensive explanation, and the source.

Falstad, Paul

2004-07-23

103

Insulated gate triac: device operation and applications  

Microsoft Academic Search

A new three-terminal power switch is described. The MOS-gated bi-directional device has forward and reverse conducting paths that utilize the same area, thus saving silicon space significantly. A single MOS-gate controls the current flow in both the forward and reverse directions. Two examples of power electronic applications that benefit from the use of this device are briefly discussed

J. S. Ajit; R. Dutta; D. Kinzer

1998-01-01

104

Numerical simulation of the light field in the atmosphere–ocean system using the matrix-operator method  

Microsoft Academic Search

A computer code to calculate the light field in the stratified atmosphere–ocean system is described and validated. The code is based on the matrix-operator method and includes multiple scattering as well as the effects at the flat or rough sea surface and the ocean ground. Special emphasis is put on the methods employed to ensure numerical accuracy and energy conservation.

Frank Fell; Jürgen Fischer

2001-01-01

105

Bulk metallic glass matrix composites: Processing, microstructure, and application as a kinetic energy penetrator  

Microsoft Academic Search

The development of alloys with high glass forming ability allows fabrication of bulk samples of amorphous metal. This capability makes these materials available for applications which require significant material thickness in all three dimensions. Superior mechanical properties and advantages in processing make metallic glass a choice candidate as a matrix material for composites. This study reports techniques for making composites

Richard B. Dandliker

1998-01-01

106

An application of the Design Structure Matrix to Integrated Concurrent Engineering  

Microsoft Academic Search

This paper demonstrates an application of the Design Structure Matrix (DSM) to Integrated Concurrent Engineering (ICE), an approach to conceptual space systems design intended to increase the pace of work by bringing together all relevant personnel in the same room to conduct focused, collaborative one-week design studies. Although the DSM methodology explicitly incorporates the concurrent aspects of engineering design, it

Mark S. Avnet; Annalisa L. Weigel

2010-01-01

107

Applicability of the market appeal—robusticity matrix: a case study of heritage tourism  

Microsoft Academic Search

Hong Kong is a city where contemporary global culture coexists with traditional Chinese heritage. One way of promoting Hong Kong's traditional built heritage is to develop a number of linked sites as a heritage trail. For helping the development of such, this study evaluates the applicability of the market appeal—robusticity matrix on heritage tourism development, by assessing the potential for

Yiping Li; Raymond Lap Bong Lo

2004-01-01

108

10 CFR 71.81 - Applicability of operating controls and procedures.  

Code of Federal Regulations, 2013 CFR

...Applicability of operating controls and procedures. ...TRANSPORTATION OF RADIOACTIVE MATERIAL Operating Controls and Procedures ...Applicability of operating controls and procedures. ...transports licensed material or delivers...

2013-01-01

109

Imaging MALDI mass spectrometry of sphingolipids using an oscillating capillary nebulizer matrix application system.  

PubMed

Matrix deposition is a critical step in tissue imaging by matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). It greatly affects the quality of MALDI imaging, especially for the analytes (such as lipids) that may easily dissolve in the solvent used for the matrix application. This chapter describes the use of an oscillating capillary nebulizer (OCN) to spray small droplets of matrix aerosol onto the sample surface for improved matrix homogeneity, reduced crystal size, and controlled solvent effects. This protocol allows visualization of many different lipid species and, of particular interest, sphingolipids in tissue slices of Tay-Sachs/Sandhoff disease by imaging MALDI-MS. The structures of these lipids were identified by analysis of tissue extracts using electrospray ionization in conjunction with tandem mass spectrometry (MS/MS and MS(3)). These results illustrate the usefulness of tissue imaging MALDI-MS with matrix deposition by OCN for the molecular analysis in normal physiology and pathology. In addition, the observation of numerous lipid subclasses with distinct localizations in the brain slices demonstrates that imaging MALDI-MS could be effectively used for "lipidomic" studies. PMID:20680588

Chen, Yanfeng; Liu, Ying; Allegood, Jeremy; Wang, Elaine; Cachón-González, Begoña; Cox, Timothy M; Merrill, Alfred H; Sullards, M Cameron

2010-01-01

110

Operations research applications in the pulp and paper industry.  

National Technical Information Service (NTIS)

Operations research, the quantitative study of optimally allocating limited resources among competing activities, became associated with pulp and paper industries in the beginning of the 1960s through applications to the cutting stock problem facing finis...

H. Halvorsen

1991-01-01

111

Application of Haddon's matrix in qualitative research methodology: an experience in burns epidemiology  

PubMed Central

Background Little has been done to investigate the application of injury specific qualitative research methods in the field of burn injuries. The aim of this study was to use an analytical tool (Haddon’s matrix) through qualitative research methods to better understand people’s perceptions about burn injuries. Methods This study applied Haddon’s matrix as a framework and an analytical tool for a qualitative research methodology in burn research. Both child and adult burn injury victims were enrolled into a qualitative study conducted using focus group discussion. Haddon’s matrix was used to develop an interview guide and also through the analysis phase. Results The main analysis clusters were pre-event level/human (including risky behaviors, belief and cultural factors, and knowledge and education), pre-event level/object, pre-event phase/environment and event and post-event phase (including fire control, emergency scald and burn wound management, traditional remedies, medical consultation, and severity indicators). This research gave rise to results that are possibly useful both for future injury research and for designing burn injury prevention plans. Conclusion Haddon’s matrix is applicable in a qualitative research methodology both at data collection and data analysis phases. The study using Haddon’s matrix through a qualitative research methodology yielded substantially rich information regarding burn injuries that may possibly be useful for prevention or future quantitative research.

Deljavan, Reza; Sadeghi-Bazargani, Homayoun; Fouladi, Nasrin; Arshi, Shahnam; Mohammadi, Reza

2012-01-01

112

N-Th Root of Hermite Matrix and its Application in Quantum Systems  

NASA Astrophysics Data System (ADS)

In this paper, the n-th root of a matrix is defined, and the explicit form of n-th root of an Hermitian matrix is given. A new method for diagonalizing quadratic Hamiltonians is proposed. Also, a class of quantum operators is induced by the linear transformation in configuration space, and its unitary properties and transformation behavior are studied. Our new method based on n-th root of matrices can develop the mathematical methods of quantum mechanics and quantum optics, and can also be applied to engineering, quantum optics and quantum fields states with squeezing properties, as well as the binomial field states.

Xu, Shi-Min; Xu, Xing-Lei; Jiang, Feng; Li, Hong-Qi

2013-08-01

113

IBM Applications and Techniques of Operations Research. A Selected Bibliography.  

ERIC Educational Resources Information Center

This bibliography on the tools and applications of operations research, management science, industrial engineering, and systems engineering lists many entries which appeared between 1961 and 1966 in 186 periodicals and trade journals. Twenty-six texts in operations research are also listed along with an indication as to which of 37 techniques or…

International Business Machines Corp., White Plains, NY. Data Processing Div.

114

Clinical application of serial operations with preserving spleen  

Microsoft Academic Search

AIM: To evaluate the clinical application of serial operations with preservation of spleen. METHODS: Serial operations with preserving spleen were performed on 211 cases in our hospital from 1980 to 2000. The patient's age ranged from 13 to 56 years, averaging 38 years. Diseases included splenic injury in 171 cases, portal hypertension in 9 cases, splenic cyst in 10 cases,

Hong-Chi Jiang; Bei Sun; Hai-Quan Qiao; Jun Xu; Da-Xun Piao; Hang Yin

115

Vacuum system operating experience review for fusion applications  

Microsoft Academic Search

This report presents a review of vacuum system operating experiences from particle accelerator, fusion experiment, space simulation chamber, and other applications. Safety relevant operating experiences and accident information are discussed. Quantitative order-of-magnitude estimates of vacuum system component failure rates and accident initiating event frequencies are presented for use in risk assessment, reliability, and availability studies. Safety concerns with vacuum systems

L. C. Cadwallader

1994-01-01

116

Cryogenic system operating experience review for fusion applications  

Microsoft Academic Search

This report presents a review of cryogenic system operating experiences, from particle accelerator, fusion experiment, space research, and other applications. Safety relevant operating experiences and accident information are discussed. Quantitative order-of-magnitude estimates of cryogenic component failure rates and accident initiating event frequencies are presented for use in risk assessment, reliability, and availability studies. Safety concerns with cryogenic systems are discussed,

L. C. Cadwallader

1992-01-01

117

Fire protection system operating experience review for fusion applications  

Microsoft Academic Search

This report presents a review of fire protection system operating experiences from particle accelerator, fusion experiment, and other applications. Safety relevant operating experiences and accident information are discussed. Quantitative order-of-magnitude estimates of fire protection system component failure rates and fire accident initiating event frequencies are presented for use in risk assessment, reliability, and availability studies. Safety concerns with these systems

Cadwallader

1995-01-01

118

COMPLEX SYMPLECTIC GEOMETRY WITH APPLICATIONS TO ORDINARY DIFFERENTIAL OPERATORS  

Microsoft Academic Search

Complex symplectic spaces, and their Lagrangian subspaces, are dened in accord with motivations from Lagrangian classical dynamics and from linear ordinary dierential operators; and then their basic algebraic prop- erties are established. After these purely algebraic developments, an Appendix presents a related new result on the theory of self-adjoint operators in Hilbert spaces, and this provides an important application of

W. N. EVERITT; L. MARKUS

119

Distortion invariant correlation filters application for quality inspection of master-matrix for security holograms  

NASA Astrophysics Data System (ADS)

Security holograms (SH) are perspective for document and product authenticity protection due to difficulties of such a protection mark falsification. Mass production of SH uses widespread technology of hot foil or lavsan paper stamping. The quality of holograms significantly depends on perfection of nickel master-matrix that is used in stamping equipment. We represent the method of automatic quality inspection of nickel master-matrix based on digital processing of its surface relief microphotographs. Proposed processing algorithm is based on combination of image spatial frequency analysis and image matching using distortion invariant correlation filters. The results of our method application for real SH master-matrices inspection are shown in this paper.

Zlokazov, Evgeny; Shaulskiy, Dmitriy; Starikov, Rostislav; Odinokov, Sergey; Zherdev, Alexander; Koluchkin, Vasiliy; Shvetsov, Ivan; Smirnov, Andrey

2013-03-01

120

Collaborative power management between operating systems and applications  

Microsoft Academic Search

Power consumption is an important design constraint for computers. Many power management policies have been studied in operating systems (OSs). These policies focus on accurately predicting idleness in workloads so that hardware components can be shut down or slowed down to save energy. Since idleness in workloads is ultimately determined by applications, some studies have proposed application-level techniques for power

Changjiu Xian

2008-01-01

121

14 CFR 119.36 - Additional certificate application requirements for commercial operators.  

Code of Federal Regulations, 2013 CFR

...certificate application requirements for commercial operators. 119.36 Section 119...OPERATIONS CERTIFICATION: AIR CARRIERS AND COMMERCIAL OPERATORS Certification, Operations...certificate application requirements for commercial operators. (a) Each...

2013-01-01

122

76 FR 19818 - Entergy Operations, Inc.; Notice of Withdrawal of Application for Amendment to Facility Operating...  

Federal Register 2010, 2011, 2012, 2013

...Amendment to Facility Operating License The U.S. Nuclear Regulatory...amendment to Facility Operating License No. DPR-51 for the Arkansas...commonly known as a Decay Heat Removal loop) to be inoperable. The...withdrew the application for license amendment (Agencywide...

2011-04-08

123

Operation and Applications of the Boron Cathodic Arc Ion Source  

SciTech Connect

The boron cathodic arc ion source has been developed with a view to several applications, particularly the problem of shallow junction doping in semiconductors. Research has included not only development and operation of the boron cathode, but other cathode materials as well. Applications have included a large deposition directed toward development of a neutron detector and another deposition for an orthopedic coating, as well as the shallow ion implantation function. Operational experience is described and information pertinent to commercial operation, extracted from these experiments, is presented.

Williams, J. M.; Freeman, J. H. [Brontek Delta Corporation, 6580 Valley Center Drive, Radford, VA 24141 (United States); Klepper, C. C. [Brontek Delta Corporation, 6580 Valley Center Drive, Radford, VA 24141 (United States); HY-Tech Research Corporation, 105 Centre Court, Radford, VA 24141 (United States); Chivers, D. J. [Ion Links Int. Ltd., 32 St. Mary's Place, Bathgate, Scotland (United Kingdom); Hazelton, R. C. [HY-Tech Research Corporation, 105 Centre Court, Radford, VA 24141 (United States)

2008-11-03

124

Artificial intelligence program in a computer application supporting reactor operations  

SciTech Connect

Improving nuclear reactor power plant operability is an ever-present concern for the nuclear industry. The definition of plant operability involves a complex interaction of the ideas of reliability, safety, and efficiency. This paper presents observations concerning the issues involved and the benefits derived from the implementation of a computer application which combines traditional computer applications with artificial intelligence (AI) methodologies. A system, the Component Configuration Control System (CCCS), is being installed to support nuclear reactor operations at the Experimental Breeder Reactor II.

Stratton, R.C.; Town, G.G.

1985-01-01

125

Growth conditions, compact perturbations and operator subdecomposability, with applications to generalized Cesàro operators  

NASA Astrophysics Data System (ADS)

We adapt recent results of Albrecht and Ricker to obtain conditions under which growth constraints on the left resolvent of a Banach space operator are preserved under suitable perturbations. As an application, we establish Bishop's property ([beta]) for certain generalized Cesàro operators on the classical Hardy spaces Hp, 1operators.

Miller, T. L.; Miller, V. G.; Neumann, M. M.

2005-01-01

126

Design of a security screening system with a capacitance sensor matrix operating in single-electrode mode  

NASA Astrophysics Data System (ADS)

A planar capacitance sensor matrix may be used to detect dangerous objects for security screening because different materials under test (MUT) have different permittivities. Usually, each capacitance sensing element consists of two electrodes, one for excitation and the other for detection. A weakness of such a two-electrode structure is that its sensing depth is limited. To increase the sensing depth, a planar capacitance sensor matrix operating in single-electrode mode has been designed for a security screening system. In this paper, the design of the planar single-electrode capacitance sensor matrix is described and its performance is analysed. A model for the single-electrode capacitance sensor and its equivalent circuit is discussed. The sensor response to the properties of MUT is studied by simulation to determine the design parameters. A single-electrode capacitance measuring circuit is designed to measure capacitance from the planar single-electrode capacitance sensor matrix. Preliminary experimental results show that a steel knife can be imaged by the screening system with the planar single-electrode capacitance sensor matrix.

Chen, Dixiang; Hu, Xiaohui; Yang, Wuqiang

2011-11-01

127

Bulk metallic glass matrix composites: Processing, microstructure, and application as a kinetic energy penetrator  

NASA Astrophysics Data System (ADS)

The development of alloys with high glass forming ability allows fabrication of bulk samples of amorphous metal. This capability makes these materials available for applications which require significant material thickness in all three dimensions. Superior mechanical properties and advantages in processing make metallic glass a choice candidate as a matrix material for composites. This study reports techniques for making composites by melt-infiltration casting using the alloy Zrsb{41.2}Tisb{13.8}Cusb{12.5}Nisb{10.0}Besb{22.5} (VitreloyspTM 1) as a matrix material. Composite rods 5 cm in length and 7 mm in diameter were made and found to have a nearly fully amorphous matrix; there was less than 3 volume percent crystallized matrix material. The samples were reinforced by continuous metal wires, tungsten powder, or silicon carbide particulate preforms. The most easily processed samples were made with uniaxially aligned tungsten and carbon steel continuous wire reinforcement; the majority of the analysis presented is of these samples. The measured porosity was typically less than 3%. The results also indicate necessary guidelines for developing processing techniques for large scale production, new reinforcement materials, and other metallic glass compositions. Analysis of the microstructure of the tungsten wire and steel wire reinforced composites was performed by x-ray diffraction, scanning electron microscopy, scanning Auger microscopy, transmission electron microscopy, and energy dispersive x-ray spectroscopy. The most common phase in the crystallized matrix is most likely a Laves phase with the approximate formula Besb{12}Zrsb3TiNiCu. In tungsten-reinforced composites, a crystalline reaction layer 240 nm thick of tungsten nanocrystals in an amorphous matrix formed. In the steel reinforced composites, the reaction layer was primarily composed of a mixed metal carbide, mainly ZrC. One promising application of the metallic glass matrix composite is as a kinetic energy penetrator material. Ballistic tests show that a composite of 80 volume percent uniaxially aligned tungsten wires and a VitreloyspTM 1 matrix has self-sharpening behavior, which is a necessary characteristic of superior penetrator materials. Small-scale tests with both aluminum and steel targets show that this composite performs better than tungsten heavy alloys typically used for penetrator applications, and comparably with depleted uranium.

Dandliker, Richard B.

128

Decellularized cartilage matrix as a novel biomatrix for cartilage tissue-engineering applications.  

PubMed

Damage of cartilage structures in the head and neck region as well as in orthopedic sites are frequently caused by trauma, tumor resection, or congenital defects. Despite a high demand in many clinical fields, until today, no adequate cartilage replacement matrix is available for these fields of application. Materials that are clinically applied for joint cartilage repair still need optimization due to difficult intraoperative handling and risk of early mechanical damage. We have developed and applied a novel chemical process to completely decellularize and sterilize human and porcine cartilage tissues (meniscus cartilage and nasal septum) to generate a new type of bioimplant matrix. To characterize this matrix and to determine the effect of the decellularization process, the content of denatured collagen (w(D)) and the content of glycosaminoglycans (GAGs) (w(G)) were determined. Possible cytotoxic effects and cellular compatibility of the matrix in vitro have been examined by seeding processed cartilage biomatrices with human primary chondrocytes as well as murine fibroblasts (L929). Vitality and state of metabolism of cells were measured using MTS assays. Both cell types adhered to scaffold surfaces and proliferated. No areas of growth inhibition or cytotoxic effects were detected. New synthesis of cartilage-specific extracellular matrix was observed. By histological staining, electron microscopy, and ?CT analysis, an increase of matrix porosity, complete cell elimination, and high GAG removal were demonstrated. Being from natural-origin, processed xenogenic and allogeneic cartilage biomatrices are highly versatile with regard to shape, size, and biomechanics, making them promising candidates for various biomedical applications. PMID:22690787

Schwarz, Silke; Koerber, Ludwig; Elsaesser, Alexander F; Goldberg-Bockhorn, Eva; Seitz, Andreas M; Dürselen, Lutz; Ignatius, Anita; Walther, Paul; Breiter, Roman; Rotter, Nicole

2012-07-20

129

The vector radiative transfer numerical model of coupled ocean-atmosphere system using the matrix-operator method  

Microsoft Academic Search

The numerical model of the vector radiative transfer of the coupled ocean-atmosphere system is developed based on the matrix-operator method, which is named PCOART. In PCOART, using the Fourier analysis, the vector radiative transfer equation (VRTE) splits up into a set of independent equations with zenith angle as only angular coordinate. Using the Gaussian-Quadrature method, VRTE is finally transferred into

He Xianqiang; Pan Delu; Bai Yan; Zhu Qiankun

2005-01-01

130

Joining of SiC\\/SiC f ceramic matrix composites for fusion reactor blanket applications  

Microsoft Academic Search

Using a preceramic polymer, joints between SiC\\/SiCf ceramic matrix composites were obtained. The polymer, upon pyrolysis at high temperature, transforms into a ceramic material and develops an adhesive bonding with the composite. The surface morphology of 2D and 3D SiC\\/SiCf composites did not allow satisfactory results to be obtained by a simple application of the method initially developed for monolithic

P. Colombo; B. Riccardi; A Donato; G Scarinci

2000-01-01

131

On the applicability of fluidic flexible matrix composite variable impedance materials for prosthetic and orthotic devices  

Microsoft Academic Search

The applicability of variable impedance fluidic flexible matrix composites (F2MC) is investigated for development of prosthetic and orthotic devices. The F2MC material is an innovative combination of high performance composite tubes containing high bulk modulus fluids. The new material system can potentially achieve a change in stiffness of several orders of magnitude through valve control. The F2MC material system is

M. Philen

2009-01-01

132

A comparison of algorithms to compute the positive matrix factorization and their application to unsupervised unmixing  

NASA Astrophysics Data System (ADS)

This paper presents a comparison of different algorithms to compute the constrained positive matrix factorization and their application to the unsupervised unmixing problem. We study numerical methods based on the Gauss-Newton algorithm, the Seung-Lee approach, the Gauss-Seidel algorithm, and penalty methods. Preliminary results using a Hyperion image from southwestern Puerto Rico presented. Algorithms will be compared in terms of their convergence performance, and quality of the results.

Masalmah, Yahya M.; Vélez-Reyes, Miguel

2006-06-01

133

Properties of graphite fiber reinforced copper matrix composites for space power applications. Final report  

Microsoft Academic Search

The thermal and mechanical properties of pitch-based graphite fiber reinforced copper matrix (Gr\\/Cu) composites usable for space applications such as radiator fins were investigated. Thermal conductivity was measured as a function of fiber volume fraction and architecture. Results showed for unidirectional P-100 Gr\\/Cu composites, the longitudinal thermal conductivity was nearly independent of fiber volume fraction. Transverse thermal conductivities (perpendicular to

1992-01-01

134

Perturbation of operators and applications to frame theory  

Microsoft Academic Search

A celebrated classical result states that an operator U on a Banach space is invertible if it is close enough to the identity\\u000a operator I in the sense that ?I?U?1. Here we show that U actually is invertible under a much weaker condition. As an application we prove new theorems concerning\\u000a stability offrames (and frame-like decompositions) under perturbation in both

Peter G. Cazassa; Ole Christensen

1997-01-01

135

Comparison of the Steady State Operator of Prigogine with the T-Matrix.  

National Technical Information Service (NTIS)

Using their general perturbation methods for solving the Liouville equation, the Prigogine group has derived a transport operator, i psi (+io). By means of this operator a generalized transport equation governing the dynamic aspects of transport phenomena...

W. C. Schieve

1966-01-01

136

Fire protection system operating experience review for fusion applications  

SciTech Connect

This report presents a review of fire protection system operating experiences from particle accelerator, fusion experiment, and other applications. Safety relevant operating experiences and accident information are discussed. Quantitative order-of-magnitude estimates of fire protection system component failure rates and fire accident initiating event frequencies are presented for use in risk assessment, reliability, and availability studies. Safety concerns with these systems are discussed, including spurious operation. This information should be useful to fusion system designers and safety analysts, such as the team working on the Engineering Design Activities for the International Thermonuclear Experimental Reactor.

Cadwallader, L.C.

1995-12-01

137

Heat kernel expansion and induced action for the matrix model Dirac operator  

NASA Astrophysics Data System (ADS)

We compute the quantum effective action induced by integrating out fermions in Yang-Mills matrix models on a 4-dimensional background, expanded in powers of a gauge-invariant UV cutoff. The resulting action is recast into the form of generalized matrix models, manifestly preserving the SO( D) symmetry of the bare action. This provides non-commutative (NC) analogs of the Seeley-de Witt coefficients for the emergent gravity which arises on NC branes, such as curvature terms. From the gauge theory point of view, this provides strong evidence that the non-commutative mathcal{N} = 4 SYM has a hidden SO(10) symmetry even at the quantum level, which is spontaneously broken by the space-time background. The geometrical view proves to be very powerful, and allows to predict nontrivial loop computations in the gauge theory.

Blaschke, Daniel N.; Steinacker, Harold; Wohlgenannt, Michael

2011-03-01

138

Characterization and decolorization applicability of xerogel matrix immobilized manganese peroxidase produced from Trametes versicolor IBL-04.  

PubMed

A novel manganese peroxidase (MnP) isolated from solid state culture of Trametes versicolor IBL-04 was immobilized using xerogel matrix composed of trimethoxysilane (TMOS) and propyltetramethoxysilane (PTMS). FTIR spectroscopy confirmed the successful entrapment of MnP into the xerogel matrix. An immobilization efficiency of 92.2% was achieved with a purified active fraction containing 2 mg/mL MnP. After 24 h incubation at varying pH and temperatures, the immobilized MnP retained 82 and 75% activity at pH 4 and 80°C, respectively. Xerogel matrix immobilization enhanced the catalytic efficiency of entrapped MnP. Metal ions including Cu2+, Mn2+ and Fe2+ stimulated enzyme activity while cysteine, EDTA and Ag+ inhibited the activity. MnP preserved 82% of its initial activity during oxidation of MnSO4 in 10 consecutive cycles, demonstrating the reusability of xerogel entrapped MnP. The immobilized MnP could be stored for up to 75 days at 4°C without significant activity loss. To explore the industrial applicability of MnP, the immobilized MnP was tested for decolorization of textile industry effluent in a Packed Bed Reactor System (PBRS). After five consecutive cycles, 98.8% decolorization of effluent was achieved within 5 h. The kinetic properties, storage stability and reusability of entrapped MnP from T. versicolor IBL-04 reflect its prospects as biocatalyst for bioremediation and other industrial applications. PMID:23016633

Iqbal, Hafiz Muhammad Nasir; Asgher, Muhammad

2013-05-01

139

Sensors for military special operations and law enforcement applications  

Microsoft Academic Search

Improvement in the capabilities of infrared, millimeter- wave, acoustic, and x-ray, sensors has provided means to detect weapons concealed beneath clothing and to provide wide-area surveillance capability in darkness and poor light for military special operations and law enforcement application. In this paper we provide an update on this technology, which we have discussed in previous papers on this subject.

David D. Ferris; Robert W. McMillan; Nicholas C. Currie; Michael C. Wicks; Mohamed A. Slamani

1997-01-01

140

Applications of the generalized bias operators in reactor theory  

Microsoft Academic Search

Generalized bias operators (GBOs) can be derived from the differences in the calculations of a nuclear system by two methods. One method is accurate and expensive and the other one is less accurate and less expensive. These GBOs serve to improve the accuracy of the less accurate methods for systems similar to the original one. Two applications are discussed. In

Y. Navon

1988-01-01

141

PROGRAMMED INSTRUCTION IN AUDIO-VISUAL EQUIPMENT OPERATION AND APPLICATION.  

ERIC Educational Resources Information Center

IN THE FALL SEMESTER OF 1963 PROGRAMED INSTRUCTION WAS INTRODUCED TO TEACH STUDENT TEACHERS THE OPERATION AND APPLICATION OF AN OVERHEAD PROJECTOR, A TAPE RECORDER, AND FILMSTRIP-SLIDE PROJECTORS. IT WAS DECIDED THAT EACH PIECE OF EQUIPMENT SHOULD BE PROGRAMED INDEPENDENTLY, THAT A LIGHT, INFORMAL APPROACH BE USED, AND THAT, WHILE LEARNING, THE…

DIAMOND, ROBERT M.

142

Human factors applications to emergency operating procedures in Mexico  

Microsoft Academic Search

The applications of human factors engineering to the emergency operating procedures (EOPs) of the Laguna Verde Nuclear Power Plant in Mexico are presented. Human factors were considered for the development, validation, implementation, and training of the Laguna Verde EOPs. During the Laguna Verde probabilistic risk assessment, experience was acquired in the area of EOPs. This led to updating and improving

P. Nelson; V. Hernandez; A. Lopez; V. Galetti

1992-01-01

143

Arbitrarily Applicable Comparative Relations: Experimental Evidence for a Relational Operant  

Microsoft Academic Search

Arbitrarily applicable derived relational responding has been argued by relational frame theorists to be a form of operant behavior. The present study examined this idea with 4 female participants, ages 4 to 5 years old, who could not perform a series of problem-solving tasks involving arbitrary more than and less than relations. In a combined multiple baseline (across responses and

NICHOLAS M. BERENS; STEVEN C. HAYES

2007-01-01

144

Application of Cost Index to Fleet Hub Operation  

Microsoft Academic Search

A cost index is used to describe a family of minimum cost flight profiles with a single number expressing the ratio of time cost to fuel cost. A unique cost index for each segment can be used to minimize fuel consumption within the time constraints dictated by hub operation. This paper addresses application of cost index to the fleet of

M. K. DeJonge; W. H. Syblon

1984-01-01

145

Processor Capacity Reserves: Operating System Support for Multimedia Applications  

Microsoft Academic Search

Multimedia applications have timing requirements that cannot generally be satisfied using the time-sharing scheduling algorithms of general purpose operating sys- tems. Our approach is to provide the predictability of real-time systems while retaining the flexibility of a time- sharing system. We designed a processor capacity reserva- tion mechanism that isolates programs from the timing and execution characteristics of other programs

Clifford W. Mercer; Stefan Savage; Hideyuki Tokuda

1994-01-01

146

Operations research applications in Taiwan: A linguistic approach  

Microsoft Academic Search

This paper discusses the utilization of specified Operations Research (OR) techniques and the application areas of OR in Taiwan's companies. Since the data solicited from the business organizations are represented by fuzzy linguistic terms, a linguistic approach is used to transform the data to total utility values for ranking. The results show that decision making with computers and statistical forecasting

Chiang Kao; Shiang-Tai Liu

1997-01-01

147

Application of Operations Research to Personal Selling Strategy  

Microsoft Academic Search

Effective application of operations research to selling strategy offers significant opportunities for understanding how the market responds to sales effort and for better strategy decisions. Lack of progress to date may have created premature disillusionment. New information technology will create new needs and opportunities for applying increasingly realistic OR techniques to selling strategy.

David B. MONTGOMERY

1968-01-01

148

Development of damped metal-matrix composites for advanced structural applications. Technical report  

SciTech Connect

The development of damped metal matrix composite structures for advanced applications has been investigated by the use of two different approaches: (1) the development of metal matrix composites with high intrinsic damping compared to that of the matrix material, and (2) the development of coated metal matrix composites with high structural damping compared to that of the composite substrates. The two different approaches are analyzed in terms of their potential for improved damping and feasibility for structural applications. Damping was measured by the transverse vibration of free-free beams using the bandwidth technique by a laser vibrometer under ambient conditions. The damping measurements were made over a wide range of frequencies (.7 kHz to 25.6 kHz) at low strain amplitudes (10 to the -10 power to 10 to the -7 power). Materials investigated for their tensile stiffness, strength, and damping performance include mechanically alloyed (MA) Aluminum-Magnesium, SiC(p)/Aluminum-Copper (MA), SiC(p)/AL, AL2O3(p)/AL, SiC(W)/AL, planar random Gr/AL, unidirectional Gr/AL and unidirectional SiC(Nicalon)/AL composites. The effects of coatings of high damping metals (nitinol and incramute) on 6061-T6 AL and AL2O3(p)/AL substrates have also been studied. The AL-Mg (MA), SiC(p)/AL (MA), SiC(W)/AL and th AL2O3(p)/AL composites show no significant improvement in damping compared with that of the 6061-T6 AL.

Updike, C.A.; Bhagat, R.B.

1990-04-01

149

Cryogenic system operating experience review for fusion applications  

SciTech Connect

This report presents a review of cryogenic system operating experiences, from particle accelerator, fusion experiment, space research, and other applications. Safety relevant operating experiences and accident information are discussed. Quantitative order-of-magnitude estimates of cryogenic component failure rates and accident initiating event frequencies are presented for use in risk assessment, reliability, and availability studies. Safety concerns with cryogenic systems are discussed, including ozone formation, effects of spills, and modeling spill behavior. This information should be useful to fusion system designers and safety analysts, such as the team working on the International Thermonuclear Experimental Reactor design.

Cadwallader, L.C.

1992-01-01

150

Experimental subwavelength localization of scatterers by decomposition of the time reversal operator interpreted as a covariance matrix.  

PubMed

The D.O.R.T. method (French acronym for Decomposition of the Time Reversal Operator) is an active remote sensing technique using arrays of antennas for the detection and localization of scatterers [Prada et at., J. Acoust. Soc. Am. 99, 2067-2076 (1996)]. The analogy between the time reversal operator and the covariance matrix used for classical sources separation in passive remote sensing [Bienvenu et al., IEEE Trans. ASSP 31, 1235-1247 (1983)] is established. Then, an experiment of subwavelength detection and localization of point-like scatterers with a linear array of transducers is presented. Using classical estimators in reception like Maximum-Likelihood and Multiple Signal Characterization (MUSIC), two point-like scatterers separated by lambda/3 and placed at 100lambda from the array of transducers are resolved. In these experiments, the role of multiple scattering and the existence of additional eigenvectors associated with dipolar and monopolar radiation of each scatterer is discussed. PMID:12880038

Prada, Claire; Thomas, Jean-Louis

2003-07-01

151

Two-loop massive operator matrix elements and unpolarized heavy flavor production at asymptotic values Q?m  

NASA Astrophysics Data System (ADS)

We calculate the O(?s2) massive operator matrix elements for the twist-2 operators, which contribute to the heavy flavor Wilson coefficients in unpolarized deeply inelastic scattering in the region Q?m. The calculation has been performed using light-cone expansion techniques. We confirm an earlier result obtained in [M. Buza, Y. Matiounine, J. Smith, R. Migneron, W.L. van Neerven, Nucl. Phys. B 472 (1996) 611, hep-ph/9601302]. The calculation is carried out without using the integration-by-parts method and in Mellin space using harmonic sums, which lead to a significant compactification of the analytic results derived previously. The results allow to determine the heavy flavor Wilson coefficients for F(x,Q) to O(?s2) and for F(x,Q) to O(?s3) for all but the power suppressed terms ?m/Q)k,k?1.

Bierenbaum, Isabella; Blümlein, Johannes; Klein, Sebastian

2007-09-01

152

Release from or through a wax matrix system. V. Applicability of the square-root time law equation for release from a wax matrix tablet.  

PubMed

To obtain basic and clear release properties, wax matrix tablets were prepared from a physical mixture of drug and wax powder at a fixed mixing ratio. Properties of release from the single flat-faced surface, curved side surface, and/or whole surface of the wax matrix tablet were examined. Then tortuosity and the applicability of Higuchi's square-root time law equation were examined. The Higuchi equation well analyzed the release processes of different release manners. However, the region fitted to the Higuchi equation differed with the release manner. Tortuosity obtained with release from the single flat-faced surface and curved side surface was comparable with that obtained with the release from a reservoir device tablet, whereas tortuosity obtained with release from the whole surface was larger. As the wax matrix tablets were prepared at a fixed mixing ratio, their internal structures should be similar. Therefore changes in the matrix volume or volume fraction with release were examined, and an extra volume where dissolved drug stray becomes large with release time in the case of release from the whole surface. These factors should be taken into account for evaluation of applicability and release properties. Furthermore, the entire release process should be analyzed using a combination of the square-root time law and other suitable equations in accordance with release manner or condition. PMID:12913226

Yonezawa, Yorinobu; Ishida, Sumio; Sunada, Hisakazu

2003-08-01

153

Gas turbine compressor unit application in sour gas field operation  

SciTech Connect

The use of sour gas as primary energy requires constant supply pressure and flow to the gas treatment plant as well as to the pipeline distribution network and consumers. During exploitation of gas fields, when the well head pressure and flow decreases, production continues at increased cost. Application of gas compression equipment is required for continuation of supply pressure and flow to the sour gas treatment plant and to customer connection flanges. The design and layout of sour gas compression equipment has to guarantee high operational availability and reliability for continuous duty. To properly select equipment for sour gas applications, including the compressor, its driver and auxiliary and ancillary systems, the specific requirements and standards have to be taken into consideration. This paper reports about a situation in the sour gas fields in the northern part of West Germany and will describe the design objectives, station layout and equipment selection for a sour gas compressor station including operating experiences.

Schmidt, K.D.; Scholz, W.; Schluter, H.

1986-01-01

154

Aggregating risk capital, with an application to operational risk  

Microsoft Academic Search

We describe a numerical procedure to obtain bounds on the distribution function of a sum of n dependent risks having fixed marginals. With respect to the existing literature, our method provides improved bounds and\\u000a can be applied also to large non-homogeneous portfolios of risks. As an application, we compute the VaR-based minimum capital\\u000a requirement for a portfolio of operational risk

Paul Embrechts; Giovanni Puccetti

2006-01-01

155

Estimation of the mean and the covariance matrix under a marginal independence assumption — an application of matrix differential calculus  

Microsoft Academic Search

The estimation of the mean and the covariance matrix of a normal population has been investigated in the literature under various assumptions. We consider minimum distance estimation of the parameters w.r.t. the Kullback-Leibler distance under a marginal independence assumption. Namely, the subvectors xL and xK are supposed to be independent when the underlying random vector x is partitioned like (x?L,

Erhard Cramer

1999-01-01

156

High-performance ab initio density matrix renormalization group method: applicability to large-scale multireference problems for metal compounds.  

PubMed

This article presents an efficient and parallelized implementation of the density matrix renormalization group (DMRG) algorithm for quantum chemistry calculations. The DMRG method as a large-scale multireference electronic structure model is by nature particularly efficient for one-dimensionally correlated systems, while the present development is oriented toward applications for polynuclear transition metal compounds, in which the macroscopic one-dimensional structure of electron correlation is absent. A straightforward extension of the DMRG algorithm is proposed with further improvements and aggressive optimizations to allow its application with large multireference active space, which is often demanded for metal compound calculations. Special efficiency is achieved by making better use of sparsity and symmetry in the operator and wave function representations. By accomplishing computationally intensive DMRG calculations, the authors have found that a large number of renormalized basis states are required to represent high entanglement of the electron correlation for metal compound applications, and it is crucial to adopt auxiliary perturbative correction to the projected density matrix during the DMRG sweep optimization in order to attain proper convergence to the solution. Potential energy curve calculations for the Cr(2) molecule near the known equilibrium precisely predicted the full configuration interaction energies with a correlation space of 24 electrons in 30 orbitals [denoted by (24e,30o)]. The energies are demonstrated to be accurate to 0.6mE(h) (the error from the extrapolated best value) when as many as 10,000 renormalized basis states are employed for the left and right DMRG block representations. The relative energy curves for [Cu(2)O(2)](2+) along the isomerization coordinate were obtained from DMRG and other correlated calculations, for which a fairly large orbital space (32e,62o) is modeled as a full correlation space. The DMRG prediction nearly overlaps with the energy curve from the coupled cluster with singles, doubles, and perturbative triple [CCSD(T)] calculations, while the multireference complete active space self-consistent field (CASSCF) calculations with the small reference configuration (8e,8o) are found to overestimate the biradical character of the electronic state of [Cu(2)O(2)](2+) according to the one-electron density matrix analysis. PMID:19548718

Kurashige, Yuki; Yanai, Takeshi

2009-06-21

157

Metal Matrix Superconductor Composites for SMES-Driven, Ultra High Power BEP Applications: Part 2  

NASA Astrophysics Data System (ADS)

A 2.5 TJ superconducting magnetic energy storage (SMES) design presentation is continued from the preceding paper (Part 1) with electromagnetic and associated stress analysis. The application of interest is a rechargeable power-beaming infrastructure for manned microwave Lightcraft operations. It is demonstrated that while operational performance is within manageable parameter bounds, quench (loss of superconducting state) imposes enormous electrical stresses. Therefore, alternative multiple toroid modular configurations are identified, alleviating simultaneously all excessive stress conditions, operational and quench, in the structural, thermal and electromagnetic sense - at some reduction in specific energy, but presenting programmatic advantages for a lengthy technology development, demonstration and operation schedule. To this end several natural units, based on material properties and operating parameters are developed, in order to identify functional relationships and optimization paths more effectively.

Gross, Dan A.; Myrabo, Leik N.

2006-05-01

158

An evaluation of fiber-reinforced titanium matrix composites for advanced high-temperature aerospace applications  

NASA Astrophysics Data System (ADS)

The current capabilities of continuous silicon-carbide fiber-reinforced titanium matrix composites (TMCs) are reviewed with respect to application needs and compared to the capabilities of conventional high-temperature monolithic alloys and aluminides. In particular, the properties of a firstgeneration titanium aluminide composite, SCS-6/Ti-24Al-11Nb, and a second-generation metastable beta alloy composite, SCS-6/TIMETAL 21S, are compared with the nickel-base superalloy IN100, the high-temperature titanium alloy Ti-1100, and a relatively new titanium aluminide alloy. Emphasis is given to life-limiting cyclic and monotonie properties and to the influence of time-dependent deformation and environmental effects on these properties. The composite materials offer a wide range of performance capabilities, depending on laminate architecture. In many instances, unidirectional composites exhibit outstanding properties, although the same materials loaded transverse to the fiber direction typically exhibit very poor properties, primarily due to the weak fiber/matrix interface. Depending on the specific mechanical property under consideration, composite cross-ply laminates often show no improvement over the capability of conventional monolithic materials. Thus, it is essential that these composite materials be tailored to achieve a balance of properties suitable to the specific application needs if these materials are to be attractive candidates to replace more conventional materials.

Larsen, James M.; Russ, Stephan M.; Jones, J. W.

1995-12-01

159

Application of matrix-assisted laser desorption/ionization mass spectrometric imaging for photolithographic structuring.  

PubMed

The aim of this contribution is the application of matrix-assisted laser desorption/ionization mass spectrometric imaging (MALDI-MSI) in the area of photolithographic structuring. As proof of concept, this method was used to image an UV exposed negative photoresist layer, which is generally used to manufacture printed circuit boards (PCB) for electronic components. The negative photoresist layer consisting of the main component novolac, benzophenone as the active component, and the solvent tetrahydrofuran was mixed with the matrix dithranol and the salt additive LiTFA and spin-coated onto an ITO-conductive glass slide. To imprint an image on the created surface, a transparency with a printed wiring diagram was placed on top of it and irradiated by UV light for 15 min. The inspection of the efficient imprinting of the microstructure onto the photoresist layer was performed by MALDI-MSI. This unique application represents a further step toward the surface analysis of polymer films by this emerging life science imaging technique. PMID:22877236

Crecelius, Anna C; Steinacker, Ralf; Meier, Alexander; Alexandrov, Theodore; Vitz, Jürgen; Schubert, Ulrich S

2012-07-30

160

An evaluation of fiber-reinforced titanium matrix composites for advanced high-temperature aerospace applications  

SciTech Connect

The current capabilities of continuous silicon-carbide fiber-reinforced titanium matrix composites (TMCs) are reviewed with respect to application needs and compared to the capabilities of conventional high-temperature monolithic alloys and aluminides. In particular, the properties of a first-generation titanium aluminide composite, SCS-6/Ti-24Al-11Nb, and a second-generation metastable beta alloy composite, SCS-6/TIMETAL 21S, are compared with the nickel-base superalloy IN100, the high-temperature titanium alloy Ti-1100, and a relatively new titanium aluminide alloy. Emphasis is given to life-limiting cyclic and monotonic properties and to the influence of time-dependent deformation and environmental effects on these properties. The composite materials offer a wide range of performance capabilities, depending on laminate architecture. In many instances, unidirectional composites exhibit outstanding properties, although the same materials loaded transverse to the fiber direction typically exhibit very poor properties, primarily due to the weak fiber/matrix interface. Depending on the specific mechanical property under consideration, composite cross-ply laminates often show no improvement over the capability of conventional monolithic materials. Thus, it is essential that these composite materials be tailored to achieve a balance of properties suitable to the specific application needs if these materials are to be attractive candidates to replace more conventional materials.

Larsen, J.M.; Russ, S.M. [Wright Lab., Wright-Patterson AFB, OH (United States). Materials Directorate; Jones, J.W. [Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering

1995-12-01

161

SMES application for frequency control during islanded microgrid operation  

NASA Astrophysics Data System (ADS)

This paper analyzes the operating characteristics of a superconducting magnetic energy storage (SMES) for the frequency control of an islanded microgrid operation. In the grid-connected mode of a microgrid, an imbalance between power supply and demand is solved by a power trade with the upstream power grid. The difference in the islanded mode is a critical problem because the microgrid is isolated from any power grid. For this reason, the frequency control during islanded microgrid operation is a challenging issue. A test microgrid in this paper consisted of a wind power generator, a PV generation system, a diesel generator and a load to test the feasibility of the SMES for controlling frequency during islanded operation as well as the transient state varying from the grid-connected mode to the islanded mode. The results show that the SMES contributes well for frequency control in the islanded operation. In addition, a dual and a single magnet type of SMES have been compared to demonstrate the control performance. The dual magnet has the same energy capacity as the single magnet, but there are two superconducting coils and each coil has half inductance of the single magnet. The effectiveness of the SMES application with the simulation results is discussed in detail.

Kim, A.-Rong; Kim, Gyeong-Hun; Heo, Serim; Park, Minwon; Yu, In-Keun; Kim, Hak-Man

2013-01-01

162

The Role of Information Technology in Operating Cost and Operational Efficiency of Banks: An Application of Frontier Efficiency Analysis  

Microsoft Academic Search

This study explores how information technology, operating cost, and operational efficiency are related to each other in banking. It is well known that the adoption of information technology can reduce organizational operating cost and improve operational efficiency. However, the intuitive impacts should be evaluated in greater detail. This paper proposes a framework for measuring the performance of information technology application,

CHU-FEN LI

2007-01-01

163

The vector radiative transfer numerical model of coupled ocean-atmosphere system using the matrix-operator method  

NASA Astrophysics Data System (ADS)

The numerical model of the vector radiative transfer of the coupled ocean-atmosphere system is developed based on the matrix-operator method, which is named PCOART. In PCOART, using the Fourier analysis, the vector radiative transfer equation (VRTE) splits up into a set of independent equations with zenith angle as only angular coordinate. Using the Gaussian-Quadrature method, VRTE is finally transferred into the matrix equation, which is calculated by using the adding-doubling method. According to the reflective and refractive properties of the ocean-atmosphere interface, the vector radiative transfer numerical model of ocean and atmosphere is coupled in PCOART. By comparing with the exact Rayleigh scattering look-up-table of MODIS(Moderate-resolution Imaging Spectroradiometer), it is shown that PCOART is an exact numerical calculation model, and the processing methods of the multi-scattering and polarization are correct in PCOART. Also, by validating with the standard problems of the radiative transfer in water, it is shown that PCOART could be used to calculate the underwater radiative transfer problems. Therefore, PCOART is a useful tool to exactly calculate the vector radiative transfer of the coupled ocean-atmosphere system, which can be used to study the polarization properties of the radiance in the whole ocean-atmosphere system and the remote sensing of the atmosphere and ocean.

Xianqiang, He; Delu, Pan; Yan, Bai; Qiankun, Zhu

2005-10-01

164

Arbitrarily Applicable Comparative Relations: Experimental Evidence for a Relational Operant  

PubMed Central

Arbitrarily applicable derived relational responding has been argued by relational frame theorists to be a form of operant behavior. The present study examined this idea with 4 female participants, ages 4 to 5?years old, who could not perform a series of problem-solving tasks involving arbitrary more than and less than relations. In a combined multiple baseline (across responses and participants) and multiple probe design (with trained and untrained stimuli), it was shown that reinforced multiple-exemplar training facilitated the development of arbitrary comparative relations, and that these skills generalized not just across stimuli but also across trial types. The sequence of training identified potential prerequisites in the development of comparative relations (e.g., nonarbitrary comparative relations). Taken as a whole, the present data, along with previous work by others in this area, suggest that relating arbitrary events comparatively is an operant. The implications of this conclusion for the analysis of complex behavior are discussed.

Berens, Nicholas M; Hayes, Steven C

2007-01-01

165

Vacuum system operating experience review for fusion applications  

SciTech Connect

This report presents a review of vacuum system operating experiences from particle accelerator, fusion experiment, space simulation chamber, and other applications. Safety relevant operating experiences and accident information are discussed. Quantitative order-of-magnitude estimates of vacuum system component failure rates and accident initiating event frequencies are presented for use in risk assessment, reliability, and availability studies. Safety concerns with vacuum systems are discussed, including personnel safety, foreign material intrusion, and factors relevant to vacuum systems being the primary confinement boundary for tritium and activated dusts. This information should be useful to fusion system designers and safety analysts, such as the team working on the Engineering Design Activities for the International Thermonuclear Experimental Reactor.

Cadwallader, L.C.

1994-03-01

166

Pattern Expression Nonnegative Matrix Factorization: Algorithm and Applications to Blind Source Separation  

PubMed Central

Independent component analysis (ICA) is a widely applicable and effective approach in blind source separation (BSS), with limitations that sources are statistically independent. However, more common situation is blind source separation for nonnegative linear model (NNLM) where the observations are nonnegative linear combinations of nonnegative sources, and the sources may be statistically dependent. We propose a pattern expression nonnegative matrix factorization (PE-NMF) approach from the view point of using basis vectors most effectively to express patterns. Two regularization or penalty terms are introduced to be added to the original loss function of a standard nonnegative matrix factorization (NMF) for effective expression of patterns with basis vectors in the PE-NMF. Learning algorithm is presented, and the convergence of the algorithm is proved theoretically. Three illustrative examples on blind source separation including heterogeneity correction for gene microarray data indicate that the sources can be successfully recovered with the proposed PE-NMF when the two parameters can be suitably chosen from prior knowledge of the problem.

Zhang, Junying; Wei, Le; Feng, Xuerong; Ma, Zhen; Wang, Yue

2008-01-01

167

Application of human error analysis to aviation and space operations  

SciTech Connect

For the past several years at the Idaho National Engineering and Environmental Laboratory (INEEL) the authors have been working to apply methods of human error analysis to the design of complex systems. They have focused on adapting human reliability analysis (HRA) methods that were developed for Probabilistic Safety Assessment (PSA) for application to system design. They are developing methods so that human errors can be systematically identified during system design, the potential consequences of each error can be assessed, and potential corrective actions (e.g. changes to system design or procedures) can be identified. The primary vehicle the authors have used to develop and apply these methods has been a series of projects sponsored by the National Aeronautics and Space Administration (NASA) to apply human error analysis to aviation operations. They are currently adapting their methods and tools of human error analysis to the domain of air traffic management (ATM) systems. Under the NASA-sponsored Advanced Air Traffic Technologies (AATT) program they are working to address issues of human reliability in the design of ATM systems to support the development of a free flight environment for commercial air traffic in the US. They are also currently testing the application of their human error analysis approach for space flight operations. They have developed a simplified model of the critical habitability functions for the space station Mir, and have used this model to assess the affects of system failures and human errors that have occurred in the wake of the collision incident last year. They are developing an approach so that lessons learned from Mir operations can be systematically applied to design and operation of long-term space missions such as the International Space Station (ISS) and the manned Mars mission.

Nelson, W.R.

1998-03-01

168

Application of best-estimate LOCA analyses to operating plants  

SciTech Connect

This paper presents results of the first application of a complete realistic approach to the analysis of large-break loss-of-coolant accidents (LBLOCAs). It meets the requirements of the revised regulation in 10 CFR 50.46 issued by the U.S. Nuclear Regulatory Commission (NRC) in 1988 and the supporting Regulatory Guide 1. 157. A complete best-estimate LOCA analysis methodology was developed under a Westinghouse/Electric Power Research Institute/Consolidated Edison project and applied to Indian Point 2 (IP2) to provide the basis for improvements in safety, reduction in fuel costs, increase in availability, and additional operating margins.

Ginsberg, A.P. [Consolidated Edison Company of New York, Inc., New York, NY (United States); Jackson, C. [Consolidate Edison Company, Buchanan, NY (United States); Pal Kalra, S. [Electric Power Research Institute, Palo Alto, CA (United States)] [and others

1995-12-31

169

On formulation of a transition matrix for electroporoelastic medium and application to analysis of scattered electroseismic wave.  

PubMed

On the basis of Pride's theory (1994) which couples Biot's theory for poroelastic medium (1956) and Maxwell equations via flux/force transport equations, we extend Yeh et al. (2004) approach for poroelastic medium to develop a transition matrix for electroporoelastic medium. The transition matrix, which relates the coefficients of scattered waves to those of incident waves, is then derived through the application of Betti's third identity and the associated orthogonality conditions for the electroporoelastic medium. To illustrate the application, a simple case of the scattering problem of a spherical electroporoelastic inclusion, embedded within the surrounding electroporoelastic medium subjected to an incident plane compressional wave is considered. PMID:17225395

Yeh, Chau-Shioung; Chen, Szu-Miau; Teng, Tsung-Jen; Lee, Yang-Jye

2006-12-01

170

Analysis Operator Learning and its Application to Image Reconstruction  

NASA Astrophysics Data System (ADS)

Exploiting a priori known structural information lies at the core of many image reconstruction methods that can be stated as inverse problems. The synthesis model, which assumes that images can be decomposed into a linear combination of very few atoms of some dictionary, is now a well established tool for the design of image reconstruction algorithms. An interesting alternative is the analysis model, where the signal is multiplied by an analysis operator and the outcome is assumed to be the sparse. This approach has only recently gained increasing interest. The quality of reconstruction methods based on an analysis model severely depends on the right choice of the suitable operator. In this work, we present an algorithm for learning an analysis operator from training images. Our method is based on an $\\ell_p$-norm minimization on the set of full rank matrices with normalized columns. We carefully introduce the employed conjugate gradient method on manifolds, and explain the underlying geometry of the constraints. Moreover, we compare our approach to state-of-the-art methods for image denoising, inpainting, and single image super-resolution. Our numerical results show competitive performance of our general approach in all presented applications compared to the specialized state-of-the-art techniques.

Hawe, Simon; Kleinsteuber, Martin; Diepold, Klaus

2013-06-01

171

Method of Moments Applications. Volume VI. Matrix Methods for Static Microstrip.  

National Technical Information Service (NTIS)

Matrix methods are applied to static microstrip problems and used to deduce the approximate propagation characteristics of the dominant, quasi-TEM mode. Three basically different techniques are employed, in conjunction with the matrix methods. The first u...

A. Farrar A. T. Adams

1975-01-01

172

Network latency and operator performance in teleradiology applications.  

PubMed

Teleradiology applications often use an interactive conferencing mode with remote control mouse pointers. When a telephone is used for voice communication, latencies of the data network can create a temporal discrepancy between the position of the mouse pointer and the verbal communication. To assess the effects of this dissociation, we examined the performance of 5 test persons carrying out simple teleradiology tasks under varying simulated network conditions. When the network latency exceeded 400 milliseconds, the performance of the test persons dropped, and an increasing number of errors were made. This effect was the same for constant latencies, which can occur on the network path, and for variable delays caused by the Nagle algorithm, an internal buffering scheme used by the TCP/IP protocol. Because the Nagle algorithm used in typical TCP/IP implementations causes a latency of about 300 milliseconds even before a data packet is sent, any additional latency in the network of 100 milliseconds or more will result in a decreased operator performance in teleradiology applications. These conditions frequently occur on the public Internet or on overseas connections. For optimal performance, the authors recommend bypassing the Nagle algorithm in teleradiology applications. PMID:15359750

Stahl, J N; Tellis, W; Huang, H K

2000-08-01

173

Application of dynamic neural networks in the modeling of drug release from polyethylene oxide matrix tablets  

Microsoft Academic Search

The main objective of this study was to demonstrate the possible use of dynamic neural networks to model diclofenac sodium release from polyethylene oxide hydrophilic matrix tablets. High and low molecular weight polymers in the range of 0.9–5×106 have been used as matrix forming materials and 12 different formulations were prepared for each polymer. Matrix tablets were made by direct

Jelena Petrovi?; Svetlana Ibri?; Gabriele Betz; Jelena Paroj?i?; Zorica ?uri?

2009-01-01

174

Applications and current limitations of matrix-assisted laser desorption Fourier transform mass spectrometry for biomolecules  

Microsoft Academic Search

The recent advances in matrix-assisted laser desorption mass spectrometry have indicated tremendous potential for the analysis of large biomolecules (MW > 100,000 Daltons) such as peptides and oligonucleotides. To achieve soft ionization for these large molecules, a matrix compound such as nicotinic acid is mixed with a small amount of the biological analyte. This matrix helps absorb the laser radiation

R. L. Hettich; M. V. Buchanan

1991-01-01

175

Improved estimation of the covariance matrix of stock returns with an application to portofolio selection  

Microsoft Academic Search

This paper proposes to estimate the covariance matrix of stock returns by an optimally weighted average of two existing estimators: the sample covariance matrix and single-index covariance matrix. This method is generally known as shrinkage, and it is standard in decision theory and in empirical Bayesian statistics. Our shrinkage estimator can be seen as a way to account for extra-market

Olivier Ledoit; Michael Wolf

2001-01-01

176

Improved estimation of the covariance matrix of stock returns with an application to portfolio selection  

Microsoft Academic Search

This paper proposes to estimate the covariance matrix of stock returns by an optimally weighted average of two existing estimators: the sample covariance matrix and single-index covariance matrix. This method is generally known as shrinkage, and it is standard in decision theory and in empirical Bayesian statistics. Our shrinkage estimator can be seen as a way to account for extra-market

Olivier Ledoit; Michael Wolf

2003-01-01

177

47 CFR 90.137 - Applications for operation at temporary locations.  

Code of Federal Regulations, 2012 CFR

...applications for operation at temporary locations exceeding 180 days by applicants using 220-222 MHz spectrum for geophysical telemetry operations need not be accompanied by evidence of frequency coordination. (b) When any unit or units of a base...

2012-10-01

178

47 CFR 90.137 - Applications for operation at temporary locations.  

Code of Federal Regulations, 2011 CFR

...applications for operation at temporary locations exceeding 180 days by applicants using 220-222 MHz spectrum for geophysical telemetry operations need not be accompanied by evidence of frequency coordination. (b) When any unit or units of a base...

2011-10-01

179

Ergonomics applications of a mechanical model of the human operator in power hand tool operation.  

PubMed

Applications of a new model for predicting power threaded-fastener-driving tool operator response and capacity to react against impulsive torque reaction forces are explored for use in tool selection and ergonomic workplace design. The model is based on a mechanical analog of the human operator, with parameters dependent on work location (horizontal and vertical distances); work orientation (horizontal and vertical); and tool shape (in-line, pistol grip, and right angle); and is stratified by gender. This model enables prediction of group means and variances of handle displacement and force for a given tool configuration. Response percentiles can be ascertained for specific tool operations. For example, a sample pistol grip nutrunner used on a horizontal surface at 30 cm in front of the ankles and 140 cm above the floor results in a predicted mean handle reaction displacement of 39.0 (SD=28.1) mm for males. Consequently 63%of the male users exceed a 30 mm handle displacement limit. When a right angle tool of similar torque output is used instead, the model predicted that only 4.6%of the male tool users exceed a 30 mm handle displacement. A method is described for interpolating individual subject model parameters at any given work location using linear combinations in relation to the range of modeled factors. Additional examples pertinent to ergonomic workstation design and tool selection are provided to demonstrate how the model can be used to aid tool selection and workstation design. PMID:15764531

Lin, Jia-Hua; Radwin, Robert; Nembhard, David

2005-02-01

180

A high-throughput mutation detection method based on heteroduplex analysis using graft copolymer matrixes: application to Brca1 and Brca2 analysis.  

PubMed

We present here a new approach to electrophoretic heteroduplex analysis (EHDA) based on improved matrixes. EHDA is an appealing technique for the detection of unknown point mutations because of its simplicity and high throughput. We present here a new matrix for electrophoretic heteroduplex analysis much more sensitive for insertions, deletions, and substitutions than reported for previous EHDA separations and also superior to DHPLC. This separation matrix is based on a copolymer with a comb architecture, poly(acrylamide-g-polydimethylacrylamide), made of a high molecular weight polyacrylamide backbone grafted with poly(dimethylacrylamide) side chains. The effect of operational parameters on electrophoretic resolution and sensitivity to single-nucleotide mismatches was studied using a collection of samples from patients bearing mutations in the breast cancer predisposition genes BRCA1 and BRCA2. Seventeen fragments (10 mutations), implying mostly substitutions on fragments with sizes ranging from 200 to 600 bp, were analyzed using a single set of separation conditions. A success rate of 94% was achieved with a qualitative analysis in terms of number of peaks, and 100% identification of mutations was obtained with a more quantitative test using peak width analysis. This strong improvement of performance with regard to previous HDA methods is attributed to a composite mechanism of separation, combining steric and chromatographic effects. It opens the route to a significant reduction of development time and operation cost for diagnostic and genomic applications. PMID:15307796

Weber, Jérémie; Barbier, Valessa; Pages-Berhouet, Sabine; Caux-Moncoutier, Virginie; Stoppa-Lyonnet, Dominique; Viovy, Jean-Louis

2004-08-15

181

Control design of linear dynamic systems with matrix differential equations for aerospace applications  

NASA Astrophysics Data System (ADS)

In this dissertation, two control design approaches for general matrix second order systems with indefinite and nonsymmetric system matrices using accelerometers are proposed. The first approach takes advantage of the distributed sensing and actuation of smart structures in which one can use as many actuators as controlled modes. In this case, the design is directly carried out via matrix second order framework. The second approach is an extended algorithm for designing the controller as well as the estimator in the form of a matrix second order system. In this approach, there are no limitations on the number of sensors and actuators. Baseline controller design is obtained using standard approaches (such as pole placement and LQR) for state space systems by feedback of velocity and displacement. Once a baseline design is available, algorithms for constructing the same closed loop system by feedback of acceleration and velocity or acceleration and displacement are proposed. Since the information of high order signals (such as acceleration) can be sensed directly, the sensor equation and control laws in a state space framework are modified to meet real situations. In order to deal with different sensors and feedback of various signals in the state space system, the 'Generalized State Space System with State Derivative Measurement' is proposed in this study. In this framework, it is assumed that different sensors are available to directly detect and feed back different types of signals(state derivative and state) to improve system performance without increasing the number of actuators. For systems in which only the state derivative can be sensed directly, a special case of 'Generalized State Space System with State Derivative Measurement', namely, the 'Reciprocal State Space System' is proposed. It is shown that many available design methods, stability tests, controllability tests and observability tests for standard state space systems can also be applied to the 'Reciprocal State Space System'. Furthermore, the control design of descriptor systems can be handled using this novel framework. The concept and design approaches of the 'Reciprocal State Space System' are supplemental to those of standard state space system. Therefore, more flexibility is obtained to deal with problems of larger scope than before. Various applications are considered to illustrate the proposed design algorithms. Thus, the dissertation provides contributions that have both theoretical and practical values.

Tseng, Yuan-Wei

182

UN Institute for Training and Research Operational Satellite Applications Programme  

NSDL National Science Digital Library

Satellites are used for just about any purpose imaginable, and the United Nations Institute for Training and Research Operational Satellite Applications Programme (UNITAR) is one that is meant to help out in "the life of communities exposed to poverty, hazards and risk." On their site, visitors should first take a look at the "What we do" area to learn about their recent achievements and work. Moving on, they can view their latest satellite maps of places such as Vietnam and Cambodia. The maps are entirely free, and they cover such topics as flood hazards, environmental degradation, and active fire locations. After a quick look, visitors can move on to read up on their satellite image services, technical assistance, and ordering information (for those who desire physical copies). The site also contains a glossary of terms, and a sign-in area for those users who wish to compile and maintain a record of the maps they will need to use most frequently.

183

Personal computer applications in DIII-D neutral beam operation  

SciTech Connect

An IBM PC AT has been implemented to improve operation of the DIII-D neutral beams. The PC system provides centralization of all beam data with reasonable access for on-line shot-to-shot control and analysis. The PC hardware was configured to interface all four neutral beam host minicomputers, support multitasking, and provide storage for approximately one month's accumulation of beam data. The PC software is composed of commercial packages used for performance and statistical analysis (i.e., LOTUS 123, PC PLOT, etc.), host communications software (i.e., PCLink, KERMIT, etc.), and applications developed software utilizing f-smcapso-smcapsr-smcapst-smcapsr-smcapsa-smcapsn-smcaps and b-smcapsa-smcapss-smcapsIc-smcaps. The objectives of this paper are to describe the implementation of the PC system, the methods of integrating the various software packages, and the scenario for on-line control and analysis.

Glad, A.S.

1986-08-01

184

Development of welding defects identifier application on radiographic film using gray level co-occurrence matrix and backpropagation  

NASA Astrophysics Data System (ADS)

Development of Welding Defect Identifiers for application in Radiographic Film by using Gray Level Co-Occurrence Matrix and Back-Propagation. A research on the application development to interpret the welding defects in industrial radiographic films by using neural networks has been conducted. This research is aimed to produce an application that implement the digital image processing, feature extraction and pattern recognition using artificial neural networks. Digital image processing applied in the development is the technique of noise removal using median filter, contrast stretching and image sharpening by Laplacian filter. Method of Grey level co-occurrence matrix (GLCM) is applied to extract features from digital images radiographic films. Back-propagation artificial neural network method is used for defect classification and interpretation of welding defect in radiographic films. The result of this research is an application of back-propagation neural networks with classification results for 60 simulated data with 95% of classification successful rate.

Abidin, Zaenal; Anompa, Muhammad Angger; Muhtadan

2013-09-01

185

Exokernel: an operating system architecture for application-level resource management  

Microsoft Academic Search

We describe an operating system architecture that securely multiplexes machine resources while permitting an unprecedented degree of application-specific customization of traditional operating system abstractions. By abstracting physical hardware resources, traditional operating systems have significantly limited the performance, flexibility, and functionality of applications. The exokernel architecture removes these limitations by allowing untrusted software to implement traditional operating system abstractions entirely at

Dawson R. Engler; M. Frans Kaashoek; James O'Toole Jr

1995-01-01

186

Space Environment Information System - SPENVIS: Applicability for Mission Operations  

NASA Astrophysics Data System (ADS)

ESA's Space Environment Information System (SPENVIS) is a system of models of the space environment and its effects on material (e.g. spacecraft). It covers the natural radiation belts, solar energetic particles, cosmic rays, plasmas, and micro-particles. SPENVIS currently integrates 35 distinct models, with new ones being added regularly. The underlying models arise from many years of research, supported by national and international space agencies, resulting in a variety of tools to investigate the Sun-Earth connection and near-earth environment. SPENVIS was originally developed as a browser-based research tool that collects these tools together, being capable of recreating the full range of conditions in most of the solar system. In recent years SPENVIS has been further developed into an Operational System. In addition to enhancing the modeling capabilities, this required an enhancement to the customer perspective, i.e. ease-of-use, consistency, stability, runtime, support, etc. SPENVIS is now available as a web-based or standalone application. This paper will present the result of the latest development project, along with user case studies that will have particular significance for the satellite operations community

Lawrence, G.; Reid, S.; Kruglanski, M.; Parmentier, N.

2009-12-01

187

Effect of Sample Matrix on Suppression of Ionization in Water Samples Using LC-ESI-MS Application  

Microsoft Academic Search

Liquid chromatography electrospray ionization mass spectrometry is a very powerful technique that combines the liquid chromatography separation with highly selec- tive and sensitive mass detection, but the ionization process is susceptible to matrix signal suppression. Signal suppression, therefore, presents a challenge in doing quantitative liquid chromatography\\/mass spec- trometry applications. Using the Agilent Technologies 1100 series quadrupole mass spectrometry system cou-

Neil Cullum; Chin-Kai Meng; Paul Zavitsanos

188

A review on application of carbonaceous materials and carbon matrix composites for heat exchangers and heat sinks  

Microsoft Academic Search

Carbonaceous materials and carbon matrix composites (CAMCs) have potential to be used in heat exchangers and heat sinks for a number of thermal management applications related to HVAC&R systems, especially in high-temperature and corrosive environments. Recent developments in carbonaceous materials, such as new, natural graphite, carbon foam, carbon nanotubes, and CAMCs, open opportunities for new heat exchanger designs for compact

Q. Wang; X. H. Han; A. Sommers; C. T’ Joen; A. Jacobi

189

ac transport studies in polymers by resistor-network and transfer-matrix approaches: Application to polyaniline  

Microsoft Academic Search

A statistical model of resistor networks is proposed to describe a polymer structure and to simulate the real and imaginary components of its ac resistivity. It takes into account the polydispersiveness of the material as well as intrachain and interchain charge transport processes. By the application of a transfer-matrix technique, it reproduces ac resistivity measurements carried out with polyaniline films

H. N. Nagashima; R. N. Onody; R. M. Faria

1999-01-01

190

Immobilized carbon nanotubes as matrix for MALDI-TOF-MS analysis: Applications to neutral small carbohydrates  

Microsoft Academic Search

In this work, we reported on the advantages of immobilized carbon nanotubes as a novel MALDI-matrix. Recently, carbon nanotubes\\u000a have been reported to be an effective MALDI matrix for small molecules (Anal. Chem.\\u000a 2003,\\u000a 75, 6191), as it can eliminate the interfering matrix peaks as well as form a web morphology to fully disperse the analyte and\\u000a allow strong ultraviolet

Shi-fang Ren; Li Zhang; Zhi-hong Cheng; Yin-long Guo

2005-01-01

191

Transfer-matrix approach to three-dimensional bond percolation: An application of Novotny's formalism  

Microsoft Academic Search

A transfer-matrix simulation scheme for the three-dimensional (d=3) bond percolation is presented. Our scheme is based on Novotny's transfer-matrix formalism, which enables us to consider arbitrary (integral) number of sites N constituting a unit of the transfer-matrix slice even for d=3 . Such an arbitrariness allows us to perform systematic finite-size-scaling analysis of the criticality at the percolation threshold. Diagonalizing

Yoshihiro Nishiyama

2006-01-01

192

Functional characterization of detergent-decellularized equine tendon extracellular matrix for tissue engineering applications.  

PubMed

Natural extracellular matrix provides a number of distinct advantages for engineering replacement orthopedic tissue due to its intrinsic functional properties. The goal of this study was to optimize a biologically derived scaffold for tendon tissue engineering using equine flexor digitorum superficialis tendons. We investigated changes in scaffold composition and ultrastructure in response to several mechanical, detergent and enzymatic decellularization protocols using microscopic techniques and a panel of biochemical assays to evaluate total protein, collagen, glycosaminoglycan, and deoxyribonucleic acid content. Biocompatibility was also assessed with static mesenchymal stem cell (MSC) culture. Implementation of a combination of freeze/thaw cycles, incubation in 2% sodium dodecyl sulfate (SDS), trypsinization, treatment with DNase-I, and ethanol sterilization produced a non-cytotoxic biomaterial free of appreciable residual cellular debris with no significant modification of biomechanical properties. These decellularized tendon scaffolds (DTS) are suitable for complex tissue engineering applications, as they provide a clean slate for cell culture while maintaining native three-dimensional architecture. PMID:23724028

Youngstrom, Daniel W; Barrett, Jennifer G; Jose, Rod R; Kaplan, David L

2013-05-27

193

MORSMATEL: a rapid and efficient code to calculate vibration-rotational matrix elements for r-dependent operators of two Morse oscillators  

NASA Astrophysics Data System (ADS)

The computer program MORSMATEL has been developed to calculate vibrational-rotational matrix elements of several r-dependent operators of two Morse oscillators. This code is based on a set of recurrence relations which are valid for any value of the power and of the quantum numbers v and J of each oscillator.

Lopez-Piñeiro, A.; Sanchez, M. L.; Moreno, B.

1992-06-01

194

Extracellular matrix production by human osteoblasts cultured on biodegradable polymers applicable for tissue engineering  

Microsoft Academic Search

The nature of the extracellular matrix (ECM) is crucial in regulating cell functions via cell–matrix interactions, cytoskeletal organization, and integrin-mediated signaling. In bone, the ECM is composed of proteins such as collagen (CO), fibronectin (FN), laminin (LM), vitronectin (VN), osteopontin (OP) and osteonectin (ON). For bone tissue engineering, the ECM should also be considered in terms of its function in

S. F. El-Amin; H. H. Lu; Y. Khan; J. Burems; J. Mitchell; R. S. Tuan; C. T. Laurencin

2003-01-01

195

Properties of Wear-Resistant Metal Matrix Composite and It's Applications.  

National Technical Information Service (NTIS)

Metal matrix composite (MMC), consisting of aluminum alloy matrix reinforced with fibers or powders of SiC or Al2O3, exhibits not only superior specific strength and specific rigidity but also high resistance to wear and heat. As such, it is expected to b...

H. Kashiwaya T. Nishimura M. Kikuchi

1989-01-01

196

Application of nanobiotechnology to construct a piezoelectric sensor matrix sensing the flexibility of immunoglobulin  

Microsoft Academic Search

We have constructed a piezoelectric sensor matrix with the capability of measuring the flexibility of immunoglobulin. The matrix consisted of 6 independent quartz crystal microbalance (QCM) coated with gold nanoparticles (GNP) of 3.5, 5, 12, 17, and 37 nm, and BSA. The detection was performed simultaneously. Antiserum against GNP bound to QCMs coated with 3.5 nm GNP and maximized for

G. Steven Huang; Yu-Shiun Chen; Xin-Yau Lin

2007-01-01

197

Polarimetric radar covariance matrix algorithms and applications to meteorological radar data  

Microsoft Academic Search

Characterization of backscatter from complex or nonstationary targets, which is partially polarized, is considered first. The possibility of constructing the covariance matrix from coherency matrix measurements is investigated, and examples using practical polarization diversity radar data from meteorological targets are given. From examining the practical data, it is found that, for this type of target, reflection symmetry exists, thus giving

V. Santalla; Yahia M. M. Antar; A. G. Pino

1999-01-01

198

Applications For Real Time NOMADS At NCEP To Disseminate NOAA's Operational Model Data Base  

NASA Astrophysics Data System (ADS)

A wide range of environmental information, in digital form, with metadata descriptions and supporting infrastructure is contained in the NOAA Operational Modeling Archive Distribution System (NOMADS) and its Real Time (RT) project prototype at the National Centers for Environmental Prediction (NCEP). NOMADS is now delivering on its goal of a seamless framework, from archival to real time data dissemination for NOAA's operational model data holdings. A process is under way to make NOMADS part of NCEP's operational production of products. A goal is to foster collaborations among the research and education communities, value added retailers, and public access for science and development. In the National Research Council's "Completing the Forecast", Recommendation 3.4 states: "NOMADS should be maintained and extended to include (a) long-term archives of the global and regional ensemble forecasting systems at their native resolution, and (b) re-forecast datasets to facilitate post-processing." As one of many participants of NOMADS, NCEP serves the operational model data base using data application protocol (Open-DAP) and other services for participants to serve their data sets and users to obtain them. Using the NCEP global ensemble data as an example, we show an Open-DAP (also known as DODS) client application that provides a request-and-fulfill mechanism for access to the complex ensemble matrix of holdings. As an example of the DAP service, we show a client application which accesses the Global or Regional Ensemble data set to produce user selected weather element event probabilities. The event probabilities are easily extended over model forecast time to show probability histograms defining the future trend of user selected events. This approach insures an efficient use of computer resources because users transmit only the data necessary for their tasks. Data sets are served by OPeN-DAP allowing commercial clients such as MATLAB or IDL as well as freeware clients such as GrADS to access the NCEP real time database. We will demonstrate how users can use NOMADS services to repackage area subsets and select levels and variables that are sent to a users selected ftp site. NOMADS can also display plots on demand for area subsets, selected levels, time series and selected variables.

Alpert, J. C.; Wang, J.; Rutledge, G.

2007-05-01

199

Matrix Metalloproteinase-9 Inhibition Reduces Inflammation and Improves Motility in Murine Models of Post-Operative Ileus  

PubMed Central

Background & Aims Matrix metalloprotease (MMP)-9, a member of the gelatinase family of MMPs, mediates leukocyte migration during inflammation. Inflammation contributes to development of post-operative ileus (POI), which is caused by physical disturbances to the bowel during abdominal surgery. We evaluated the role of MMP-9 in POI and investigated whether disruption of MMP-9 or administration of an inhibitor of MMP-9 activity reduced cellular inflammation and bowel dysmotility in rat and mouse models of POI. Methods Mice and rats underwent laparotomy and bowel manipulation; bowel tissues were collected 3–24 hr later and analyzed by real time reverse transcriptase PCR, immunoblot, in situ zymography, and functional analyses. Results Bowel manipulation resulted in a time-dependent increase in MMP-9 expression within the intestinal muscularis; increases in MMP-9 mRNA were iNOS-dependent. Immunoblot analyses confirmed the presence of the pro-enzyme and the catalytically active form of MMP-9. Administration of MMP-2/MMP-9 II, a dual active-site inhibitor, reduced the number of myeloperoxidase-positive immune cells that infiltrated the muscularis and prevented the surgically induced reduction in bowel smooth muscle contractility. Zymography analysis, performed in muscularis whole mounts in situ, indicated that MMP-9 and not MMP-2 mediated the gelatinase activity observed in infiltrating cells. MMP-9 knockout mice were protected from the inflammation and dysmotility associated with POI. Conclusions MMP-9 mediates cellular inflammatory responses within the intestinal muscularis in mouse and rat models of POI. Inhibition of MMP-9 activity reduced recruitment of immune cells to the intestinal muscularis, preventing loss of smooth muscle contractility. Induction of MMP-9 expression requires iNOS.

Moore, Beverley A.; Manthey, Carl L.; Johnson, Dana L.; Bauer, Anthony J.

2011-01-01

200

Universal elements for non-linear operators and their applications  

NASA Astrophysics Data System (ADS)

We prove that under certain topological conditions on the set of universal elements of a continuous map T acting on a topological space X, that the direct sum T[circle plus operator]Mg is universal, where Mg is multiplication by a generating element of a compact topological group. We use this result to characterize -supercyclic operators and to show that whenever T is a supercyclic operator and z1,...,zn are pairwise different non-zero complex numbers, then the operator z1T[circle plus operator]...[circle plus operator]znT is cyclic. The latter answers affirmatively a question of Bayart and Matheron.

Shkarin, Stanislav

2008-12-01

201

Exokernel: an operating system architecture for application-level resource management  

Microsoft Academic Search

Traditional operating systems limit the performance, flexibility, and functionality of applications by fixing the interface and implementation of operating system abstractions such as interprocess communication and virtual memory. The exokernel operating system architecture addresses this problem by providing application-level management of physical resources. In the exokernel architecture, a small kernel securely exports all hardware resources through a lowlevel interface to

Dawson R. Engler; M. Frans Kaashoek; James O'Toole Jr

1995-01-01

202

Research on the application of comprehensive budget management in China based on operation: Problems and countermeasures  

Microsoft Academic Search

As an advanced management mode with budget as an instrument, comprehensive budget management is widely applied abroad. However, its application in China is faced with many problems, and its further application is thus greatly hindered. As a new method of cost management, operation management is formed based on operation cost and its key lies in operation analysis. Comprehensive budget management

Hua Zhang; Qinqin Li; Yinde Zhao; Xiaoyu Ni

2011-01-01

203

Wavelet crosstalk matrix and its application to assessment of shift-variant imaging systems  

SciTech Connect

The objective assessment of image quality is essential for design of imaging systems. Barrett and Gifford [1] introduced the Fourier cross talk matrix. Because it is diagonal for continuous linear shift-invariant imaging systems, the Fourier cross talk matrix is a powerful technique for discrete imaging systems that are close to shift invariant. However, for a system that is intrinsically shift variant, Fourier techniques are not particularly effective. Because Fourier bases have no localization property, the shift-variance of the imaging system cannot be shown by the response of individual Fourier bases; rather, it is shown in the correlation between the Fourier coefficients. This makes the analysis and optimization quite difficult. In this paper, we introduce a wavelet cross talk matrix based on wavelet series expansions. The wavelet cross talk matrix allows simultaneous study of the imaging system in both the frequency and spatial domains. Hence it is well suited for shift variant systems. We compared the wavelet cross talk matrix with the Fourier cross talk matrix for several simulated imaging systems, namely the interior and exterior tomography problems, limited angle tomography, and a rectangular geometry positron emission tomograph. The results demonstrate the advantages of the wavelet cross talk matrix in analyzing shift-variant imaging systems.

Qi, Jinyi; Huesman, Ronald H.

2002-11-01

204

Application of the adjacency matrix eigenvectors method to geometry determination of toroidal carbon molecules  

NASA Astrophysics Data System (ADS)

Torusenes are defined as closed toroidal networks where every vertex or atom is 3-valent, and they can represent pure carbon tori. Here we study the geometries of two classes: hexagonal torusenes containing purely polyhex networks and the second class, 5,6,7-ring torusenes which besides hexagons contain also an equal number of 5- and 7-membered rings. As sophisticated quantum-mechanical methods for geometry determination are time consuming for large carbon cages, and having in mind the huge number of their isomers, one is interested in methods which are simple to apply but which are still able to produce plausible geometries. One of them is offered by the adjacency matrix elgenvectors (AME) method, which was proposed in this journal [D. E. Manolopoulos and P. W. Fowler, J. Chem. Phys. 96, 7603 (1992)]. The application of the AME method to fullerenes is based on an appropriately chosen triplet of eigenvectors. A rational choice may be made on the basis of their nodal properties. No rules have been formulated up to now on how to apply the AME method to torusenes. In order to find such a rule a systematic study of nodal properties of torusenes is crucial, and such a study is the subject of this paper. Theoretical and computer experimental considerations presented here suggest that a triplet a2,a3,aopt fulfills the task where the aopt should be checked for among those eigenvectors which possess no radial nodal plane but have one axial cut. In the present paper these findings have been elaborated for 5,6,7-ring torusenes with up to 270 atoms, and computer experiments have shown that similar findings hold for purely polyhex torusenes with up to 224 carbon atoms as well. In order to understand better these nodal properties, a quantum-mechanical study of free electrons on the surface of a torus was also undertaken.

Graovac, Ante; Plavši?, Dejan; Kaufman, Matjaž; Pisanski, Tomaž; Kirby, Edward C.

2000-08-01

205

Developing scandium and zirconium containing aluminum boron carbide metal matrix composites for high temperature applications  

NASA Astrophysics Data System (ADS)

The study presented in this thesis focuses on developing castable, precipitation-strengthened Al--B4C metal matrix composites (MMCs) for high temperature applications. In the first part, B4C plates were immersed in liquid aluminum alloyed with Sc, Zr and Ti to investigate the interfacial reactions between B4C and liquid aluminum The influences of Sc, Zr and Ti on the interfacial microstructure in terms of individual and combined additions were examined. Results reveal that all three elements reacted with B4C and formed interfacial layers that acted as a diffusion barrier to limit the decomposition of B4C in liquid aluminum. The interfacial reactions and the reaction products in each system were identified. With the combined addition of Sc, Zr and Ti, most of the Ti was found to enrich at the interface, which not only offered appropriate protection of the B4C but also reduced the consumption of Sc and Zr at the interface. In the second part, Sc and Zr were introduced into Al-15vol.% B 4C composites presaturated by Ti, and eight experimental composites with different Sc and Zr levels were prepared via a conventional casting technique. It was found that Sc was involved in the interfacial reactions with B 4C that partially consume Sc. The Sc addition yielded considerable precipitation strengthening in the as-cast and peak aged conditions. To achieve an equivalent strengthening effect of Sc in binary Al-Sc alloys, approximately double the amount of Sc is required in Al-B4C composites. On the contrary, no major Zr reaction products were found at the interfaces and the major part of Zr remained in the matrix for the precipitation strengthening. The combination of Sc and Zr enhanced sthe precipitation strengthening. Two kinds of nanoscale precipitates, Al3Sc and Al3(Sc, Zr), were found in the as-cast microstructure and contributed to the increase in the matrix hardness. In the third part, all the experimental composites were isothermally aged at 300, 350, 400 and 450°C after a homogenization/solution treatment. Results demonstrate that the addition of Sc generated a considerable precipitation hardening of the matrix of the composites for all aging temperatures applied. The precipitation hardening effect increased when increasing the Sc content and decreased with increase in aging temperature. The combination of alloying Sc and Zr in Al-B4C composites produced a remarkable synergistic effect. The addition of Zr provided not only a strength increase at peak aging but also an improvement of thermal stability. The composites with a high Zr:Sc ratio (?1) showed excellent thermal stability of the strength up to 400°C. The overaging in these materials was delayed by ˜100°C compared with the Zr-free composites at the same Sc level. The precipitate volume fraction, the average radius and the size distribution of nanoscale Al3Sc and Al3(Sc,Zr) precipitates during the aging process were measured. The Al3(Sc,Zr) precipitates generally showed a much better coarsening resistance than the Al3Sc precipitates. In the fourth part, two experimental composites with 0.4wt.% Sc and 0.4wt.% Sc plus 0.24wt.% Zr 0were selected to examine the mechanical properties during long-term exposure (2000h) at elevated temperatures from 250 to 350°C. For long-term thermal stability, the mechanical properties of the Sc and Zr containing composite were stable up to 300°C, while the composite containing only Sc exhibited a good softening resistance up to 250°C. At higher temperatures the strengths of both composites decreased with prolonged annealing time. The reduction of the composites' mechanical properties during long-time annealing at higher temperatures was dominated by the precipitate coarsening. Finally, two experimental composites with 0.58wt.% Sc and 0.58wt.% Sc plus 0.24wt.% Zr, were respectively hot-rolled to a 2 mm thick sheet with a total reduction of 93%. Results indicate that the Sc- and Zr-containing composites possessed a good hot rolling processability. (Abstract shortened by UMI.)

Lai, Jing

206

Particulate Titanium Matrix Composites Tested--Show Promise for Space Propulsion Applications.  

National Technical Information Service (NTIS)

Uniformly distributed particle-strengthened titanium matrix composites (TMCs) can be manufactured at lower cost than many types of continuous-fiber composites. The innovative manufacturing technology combines cold and hot isostatic pressing procedures to ...

B. A. Lerch J. R. Ellis

2004-01-01

207

Density matrix renormalization group method. Application to the EPP model of a cyclic polyene chain.  

National Technical Information Service (NTIS)

The density matrix renormalization group (DMRG) method introduced by White for the study of strongly interacting electron systems is reviewed; the method is variational and considers a system of localized electrons as the union of two adjacent fragments A...

G. Fano F. Ortolani L. Ziosi

1997-01-01

208

Storage of Ag nanoparticles in pore-arrays of SU8 matrix for antibacterial applications  

Microsoft Academic Search

Silver nanoparticles (NPs) stored in pore-arrays (pa) SU-8 photoresist layer were utilized as an antibacterial nanocomposition against E. coli bacteria. The pa-SU-8 matrix was fabricated by an optical interference lithography method resulting in small pores with a diameter of ~50 nm and a depth of ~100 nm. The Ag NPs were deposited on the soft polymeric matrix at different drying

O. Akhavan; M. Abdolahad; R. Asadi

2009-01-01

209

Applications of matrix-assisted laser desorption fourier transform mass spectrometry for biomolecules  

Microsoft Academic Search

Matrix-assisted laser desorption FTMS provides a powerful technique for the generation and structural characterization of\\u000a normal and modified oligonucleotides. Examination of these compounds using 266 nm radiation and a nicotinic acid matrix revealed\\u000a (M-H)? ions as well as fragment ions which provided structural information. The fragmentation observed resulted primarily from elimination\\u000a of nucleosides from the 5? end of the oligomers

R. Hettich; M. V. Buchanan

1991-01-01

210

Application of a fiber-matrix model to transport in renal tubules  

Microsoft Academic Search

The effects of tight junction structure on water and solute fluxes across proximal tubular epithelium were examined with fiber-matrix equations previously derived by Curry and Michel (1980. Microvascular Research. 20:96-99). Using plausible estimates of tight junction fiber length and width the model pre- dicts solute (Ps) and water permeability (Lp) coefficients that agree with the mea- sured values. When fiber-matrix

W. D. Fraser; A. D. BAINES

1989-01-01

211

Zhang neural network and its application to Newton iteration for matrix square root estimation  

Microsoft Academic Search

A special class of recurrent neural networks (RNN) has recently been proposed by Zhang et al. for solving online time-varying\\u000a matrix problems. Being different from conventional gradient-based neural networks (GNN), such RNN (termed specifically as\\u000a Zhang neural networks, ZNN) are designed based on matrix-valued error functions, instead of scalar-valued norm-based energy\\u000a functions. In this paper, we generalize and further investigate the

Yunong Zhang; Yiwen Yang; Binghuang Cai; Dongsheng Guo

212

Transglutaminase 2 cross-linking of matrix proteins: biological significance and medical applications  

Microsoft Academic Search

This review summarises the functions of the enzyme tissue transglutaminase (TG2) in the extracellular matrix (ECM) both as\\u000a a matrix stabiliser through its protein cross-linking activity and as an important cell adhesion protein involved in cell\\u000a survival. The contribution of extracellular TG2 to the pathology of important diseases such as cancer and fibrosis are discussed\\u000a with a view to the

R. J. Collighan; M. Griffin

2009-01-01

213

Metal Matrix Composites  

Microsoft Academic Search

Metal matrix composites have found selected application in areas that can cost-effectively capitalize on improvements in specific stiffness, specific strength, fatigue resistance, wear resistance, and coefficient of thermal expansion. Metal matrix composites comprise a relatively wide range of materials defined by the metal matrix, reinforcement type, and reinforcement geometry. In the area of the matrix, most metallic systems have been

Warren Hunt; Darrell R. Herling

2004-01-01

214

Review of Operations Research Applications in Workforce Planning and Potential Modeling of Military Training.  

National Technical Information Service (NTIS)

This report presents the review of workforce planning applications of operations research and explores potential modelling of military training. We classify the operations research techniques applied in workforce planning into four major branches: Markov ...

J. Wang

2005-01-01

215

Operational Testing and Applications of the AIRS FPA with Infrared Fisheye Optics.  

National Technical Information Service (NTIS)

Nova's development of the Modular Infrared Imaging Applications Development System (MIRIADS) produced a longwave infrared (LWIR) camera system that operated the Adaptive Infrared Sensor (AIRS) focal plane device produced by the Raytheon Infrared Operation...

C. R. Baxter M. A. Massie T. J. Bartolac

2002-01-01

216

High-speed simulation of skin spectral reflectance based on an optical path-length matrix method and its application  

NASA Astrophysics Data System (ADS)

In this paper, we propose optical path-length matrix method for high-speed simulation of photon migration in human skin. The optical path-length matrix is defined as the probability density distribution of optical pathlength in the skin. Generally, Monte Carlo simulation is used to simulate a skin reflectance, since it can simulate the reflectance accurately. However, it requires a huge computation time, thus this is not easily applicable in practical imaging system with large number of pixels. On the other hand, the proposed optical path-length matrix method achieves the simulation in shorter time. The skin model was assumed to be two-layered media of the epidermal and dermal layers. For obtaining the path-length matrix, photon migration in the model without any absorption was simulated only once by Monte Carlo simulation for each wavelength, and the probabilistic density histograms of the optical path-length at each layer were acquired and stored in the optical path-length matrix. Skin spectral reflectance for arbitrary absorption can be calculated easily by accumulating all combination of an element in the above pre-recomputed path-length matrix and absorption coefficient based on the Beer-Lambert law. Our proposed method was compared with the conventional Monte Carlo simulation. Computational time of the proposed method was approximately two minutes; while that of the conventional method was 15 hours. In addition, error margin of the proposed method was approximately less than 1.6%. This method would applied to skin spectral image analysis for skin chromophore quantification.

Fujiwara, Izumi; Yamamoto, Satoshi; Yamauchi, Midori; Ogawa-Ochiai, Keiko; Nakaguchi, Toshiya; Tsumura, Norimichi

2011-02-01

217

The Applicability of Self-Awareness for Network Management Operations  

NASA Astrophysics Data System (ADS)

Network management operation will get increasingly more difficult in next generation and Future Internet scenarios due to many factors, such as mobility and the need for context-awareness. This position paper argues that the increasing complexity in business, system, and other operations can only be managed by making the systems aware of their own operations. This is shown by describing how self-awareness is implemented in the FOCALE autonomic architecture.

Strassner, John; van der Meer, Sven; Hong, James Won-Ki

218

Reversible quantum operations and their application to teleportation  

Microsoft Academic Search

Quantum operations provide a general description of the state changes allowed\\u000aby quantum mechanics. Simple necessary and sufficient conditions for an ideal\\u000aquantum operation to be reversible by a unitary operation are derived in this\\u000apaper. These results generalize recent work on reversible measurements by\\u000aMabuchi and Zoller [Phys. Rev. Lett. {\\\\bf 76}, 3108 (1996)]. Quantum\\u000ateleportation can be understood

M. A. Nielsen; Carlton M. Caves

1997-01-01

219

An Operating-System-Level Framework for Providing Application-Aware Reliability  

Microsoft Academic Search

Operating systems enable collecting and extracting rich information on application execution characteristics, including program counter traces, memory access patterns, and operating-system-generated signals. This information can be exploited to design highly efficient, application-aware reliability mechanisms that are transparent to applications. This paper describes the Reliability MicroKernel framework (RMK), a loadable kernel module for providing application-aware reliability and dynamically configuring reliability mechanisms

Long Wang; Zbigniew Kalbarczyk; Weining Gu; Ravi Iyer

220

Multipole representation of the Fermi operator with application to the electronic structure analysis of metallic systems  

NASA Astrophysics Data System (ADS)

We propose a multipole representation of the Fermi-Dirac function and the Fermi operator and use this representation to develop algorithms for electronic structure analysis of metallic systems. The algorithm is quite simple and efficient. Its computational cost scales logarithmically with ??? where ? is the inverse temperature and ?? is the width of the spectrum of the discretized Hamiltonian matrix.

Lin, Lin; Lu, Jianfeng; Car, Roberto; E, Weinan

2009-03-01

221

GIS applications for military operations in coastal zones  

Microsoft Academic Search

In order to successfully support current and future US military operations in coastal zones, geospatial information must be rapidly integrated and analyzed to meet ongoing force structure evolution and new mission directives. Coastal zones in a military-operational environment are complex regions that include sea, land and air features that demand high-volume databases of extreme detail within relatively narrow geographic corridors.

S. Fleming; T. Jordan; M. Madden; E. L. Usery; R. Welch

2009-01-01

222

Design, fabrication, and operation of hybrid bionanodevices for biomedical applications  

Microsoft Academic Search

Cells are the fundamental building blocks of life. Despite their simplicity, cells are extremely versatile, performing a variety of functions including detection, signaling, and repair. While current biomedical devices operate at the organ level, the next generation will operate at the cellular level, combining the nanoscale machinery of cells with the mechanical robustness of synthetic materials in the form of

Robert Matthew Tucker

2009-01-01

223

The Application of EVT-Copula in Operational Risk Quantification  

Microsoft Academic Search

As the operational risk of Chinese banks becomes increasingly outstanding, we need urgently to find out a accurate measurement method. This article takes one commercial bank as an example, analyses the tails' characteristics of three types of operational risk loss event. It measures the fat-tail and light-tail loss by the POT model of EVT and logarithm normal model. Since the

Hu Liqin; Peng Hongfeng

2007-01-01

224

RoboCon: Operator interface for robotic applications  

SciTech Connect

Carnegie Mellon U. and ORNL`s Robotics and Process Systems Division are developing a state-of-the-art robot operator control station (RoboCon) with standardized hardware and software control interfaces to be adaptable to a variety of remote and robotic equipment currently funded by DOE`s Office of Science & Technology Robotics Technology Development Program. The human operation and telerobotic and supervisory control of sophisticated and remote and robotic systems is a complex, tiring, and non-intuitive activity. Since decontamination & decommissioning, selective equipment removal, mixed waste operations, and in-tank cleanup are going to be a major future activity in DOE environmental restoration and waste management cleanup agenda, it seems necessary to utilize an operator control station and interface which maximizes operator comfort and productivity.

Schempf, H.; Warwick, J.; Fung, M.; Chemel, B.; Blackwell, M.

1996-12-31

225

The matrix coalescent and an application to human single-nucleotide polymorphisms.  

PubMed Central

The "matrix coalescent" is a reformulation of the familiar coalescent process of population genetics. It ignores the topology of the gene tree and treats the coalescent as a Markov process describing the decay in the number of ancestors of a sample of genes as one proceeds backward in time. The matrix formulation of this process is convenient when the population changes in size, because such changes affect only the eigenvalues of the transition matrix, not the eigenvectors. The model is used here to calculate the expectation of the site frequency spectrum under various assumptions about population history. To illustrate how this method can be used with data, we then use it in conjunction with a set of SNPs to test hypotheses about the history of human population size.

Wooding, Stephen; Rogers, Alan

2002-01-01

226

Wireless Sensor Applications for Building Operation and Management  

SciTech Connect

This chapter provides an introduction to wireless sensing technology, its potential applications in buildings, three practical examples of tests in real buildings, estimates of impacts on energy consumption, discussions of costs and practical issues in implementation, and some ideas on applications likely in the near future.

Brambley, Michael R.; Kintner-Meyer, Michael CW; Katipamula, Srinivas; O'Neill, Patrick

2005-07-29

227

Applicability of Visual Analytics to Defence and Security Operations.  

National Technical Information Service (NTIS)

In the context of modern defence and security operations, analysts are faced with a continuously growing set of information of different nature which causes significant information overload problems and prevent developing good situation awareness. Fortuna...

D. Gouin V. Lavigne

2011-01-01

228

Application of anticancer agent embolism in Miles’ operation  

Microsoft Academic Search

Summary  Presented in this paper is a report of the prospective studies on rectal cancer. By using the method of anticancer agent gelatin\\u000a sponge to form embolism and by ligating the bilateral arteria ilica internal, we performed Miles’ operation on 64 cases of\\u000a rectal cancer. Only 24 cases in the control group had Miles’ operation. The amount of blood transfused during

Liu Fei-long; Yie Qi-fa; Yang Chuan-yuan; Zhao Cui-lang; Dai Zhi-ben

1995-01-01

229

Nonnegative Matrix Factorization with Orthogonality Constraints and its Application to Raman Spectroscopy  

Microsoft Academic Search

We introduce non-negative matrix factorization with orthogonality constraints (NMFOC) for detection of a target spectrum in a given set of Raman spectra data. An orthogonality measure is defined and two different orthogonality constraints are imposed on the standard NMF to incorporate prior information into the estimation and hence to facilitate the subsequent detection procedure. Both multiplicative and gradient type update

Hualiang Li; Tülay Adali; Wei Wang; Darren Emge; Andrzej Cichocki

2007-01-01

230

A penalized matrix decomposition, with applications to sparse principal components and canonical correlation analysis  

PubMed Central

We present a penalized matrix decomposition (PMD), a new framework for computing a rank-K approximation for a matrix. We approximate the matrix X as , where dk, uk, and vk minimize the squared Frobenius norm of X, subject to penalties on uk and vk. This results in a regularized version of the singular value decomposition. Of particular interest is the use of L1-penalties on uk and vk, which yields a decomposition of X using sparse vectors. We show that when the PMD is applied using an L1-penalty on vk but not on uk, a method for sparse principal components results. In fact, this yields an efficient algorithm for the “SCoTLASS” proposal (Jolliffe and others 2003) for obtaining sparse principal components. This method is demonstrated on a publicly available gene expression data set. We also establish connections between the SCoTLASS method for sparse principal component analysis and the method of Zou and others (2006). In addition, we show that when the PMD is applied to a cross-products matrix, it results in a method for penalized canonical correlation analysis (CCA). We apply this penalized CCA method to simulated data and to a genomic data set consisting of gene expression and DNA copy number measurements on the same set of samples.

Witten, Daniela M.; Tibshirani, Robert; Hastie, Trevor

2009-01-01

231

The Application of an Enamel Matrix Protein Derivative (Emdogain®) in Regenerative Periodontal Therapy: A Review  

Microsoft Academic Search

Regenerative periodontal therapy aims at reconstitution of the lost periodontal structures such as new formation of root cementum, periodontal ligament and alveolar bone. Findings from basic research indicate that enamel matrix protein derivative (EMD) has a key role in periodontal wound healing. Histological results from animal and human studies have shown that treatment with EMD promotes periodontal regeneration. Moreover, clinical

Anton Sculean; Frank Schwarz; Jürgen Becker; Michel Brecx

2007-01-01

232

An introduction to the application of the simplest matrix-generalized inverse in systems science  

Microsoft Academic Search

Various kinds of matrix-generalized inverses are defined and classified. Theorems on the existence, calculation, and use of the simplest generalized inverse are stated. Matrices of functions receive special attention. Generalized inverses are applied to solving underdetermined and overdetermined systems of equations, specifically those that arise in linear control problems. Simple examples illustrate suggested procedures.

VICTOR LOVASS-NAGY; RICHARD J. MILLER; DAVID L. POWERS

1978-01-01

233

New Factorized S-Matrix and Its Application to Exactly Solvable q-State Model. I  

Microsoft Academic Search

Presented is a new q-state factorized S-matrix which possesses the CPT invariances, crossing symmetry and the charge conservation symmetry. The result is a generalization of Zamolodchikov and Fateev's case (q = 3) to arbitrary q case. Another solution of the factorization equations is given and asymmetric generalization of the q-state model is discussed.

Kiyoshi Sogo; Yasuhiro Akutsu; Takayuki Abe

1983-01-01

234

The Application of a Job Exposure Matrix in the Natural Gas Industry  

Microsoft Academic Search

A questionnaire was designed, implemented, and analyzed, using a job exposure matrix format, to profile jobs in the Pipeline Division of a natural gas company with respect to possible hazardous exposures. The categories of chemical, physical, ergonomic, biological, and psychological hazards were surveyed. The first stage was to formulate and confirm a list of hazardous agents extant within the Pipeline

Nora Maher

2003-01-01

235

Application of pressure infiltration to the manufacturing of aluminium matrix composite materials with different reinforcement shape  

Microsoft Academic Search

Purpose: The purpose of this work is to investigate the influence of reinforcing phase's shape on structure and properties of composite materials with aluminium alloy matrix. Design\\/methodology\\/approach: The material for studies was produced by a method of pressure infiltration of the porous ceramic framework. In order to investigate the influence of reinforcing phase's shape the comparison was made between the

L. A. Dobrza?ski a; M. Kremzer; A. Nagel

236

Constrained Flows of Matrix-Valued Functions: Application to Diffusion Tensor Regularization  

Microsoft Academic Search

Nonlinear partial differential equations (PDE) are now widely used to regularize images. They allow to eliminate noise and ar- tifacts while preserving large global features, such as object contours. In this context, we propose a geometric framework to design PDE flows actingon constrained datasets. We focus our interest on flows of matrix- valued functions undergoing orthogonal and spectral constraints. The

C. Chefd; D. Tschumperle; R. Deriche; O. Faugeras

237

Constrained Flows of Matrix-Valued Functions: Application to Diffusion Tensor Regularization  

Microsoft Academic Search

Abstract. Nonlinear partial differential equations (PDE) are now widely used to regularize images. They allow to eliminate noise and ar- tifacts while preserving large global features, such as object contours. In this context, we propose a geometric framework to design PDE flows actingon constrained datasets. We focus our interest on flows of matrix- valued functions undergoing orthogonal and spectral constraints.

Christophe Chefd'hotel; David Tschumperlé; Rachid Deriche; Olivier D. Faugeras

2002-01-01

238

Automotive applications polymer matrix composites. (Latest citations from Engineered Materials abstracts). NewSearch  

SciTech Connect

The bibliography contains citations concerning the use of polymer matrix composites in automotive body parts, structural frame members, and engine components. Design, manufacturing, and performance considerations are examined. The future of engineered plastics and their role in new products are reviewed. (Contains 250 citations and includes a subject term index and title list.)

Not Available

1994-10-01

239

Polar Satellite Products for the Operational Meteorologist, Module 2: Microwave Products and Applications  

NSDL National Science Digital Library

Polar Satellite Products for the Operational Forecaster will be a series of short Web-based lessons that demonstrate the use of polar satellite imagery and derived products in a variety of settings. POES 2: Microwave Products and Applications focuses on microwave applications from the AMSU and SSM/I instruments and includes descriptions and examples of the operational and experimental microwave products available.

Spangler, Tim

1996-10-01

240

Operational applications of remote sensing in hydrology: success, prospects and problems  

Microsoft Academic Search

The use of remote sensing information in operational hydrology is relatively limited, but specific examples can be cited for determining precipitation, soil moisture, groundwater, snow, surface water and basin characteristics. The application of remote sensing in hydrology can be termed operational if at least one of two conditions are met: (a) the application produces an output on a regular basis,

ALBERT RANGO; AHLAM I. SHALABY

1999-01-01

241

Qt-based mobile application GUI style for smart phone operating system  

Microsoft Academic Search

On the one hand, smart phones are becoming an important means for personal and business applications, such as voice, data, e-mail, and Internet access. And on the other hand, the most current operating system for smart phones has greatly extended the application fields in the future. The current popular smart phone operating systems are quite different and there is not

Xingyan Shi; Wei Zhang

2010-01-01

242

Split skin graft application over an integrating, biodegradable temporizing polymer matrix: immediate and delayed.  

PubMed

The objective of this study is to further investigate the NovoSorb™ biodegradable polyurethane in generating dermal scaffolds; to perform a pilot study comparing the previously used spun mat against a recently developed NovoSorb™ foam, ascertaining the optimum structure of the matrix; and to evaluate the successful matrix as an immediate adjunct to split skin grafting and as a temporizing matrix in a prospective six-pig study. A pilot study comparing a previously investigated form of the polymer (spun mat) against a new structural form, a foam, was performed. This was followed by a six-pig study of the foam matrix with three treatment arms-autologous split skin graft alone, polymer foam with immediate engraftment, and polymer foam with delayed engraftment. The foams allowed less wound contraction than the spun mats. The foam structure is less dense (cheaper to produce and having less degradation products). The material remained in situ despite clinical wound infection. Proof of concept was achieved in both treatment modalities in the main study. Split skin graft applied immediately over the polymer foam was able to engraft successfully. The result was "thicker" to pinch and "flush" with the skin surrounding the wound. There was no significant difference in the degree of wound contraction between the graft alone and the polymer plus immediate graft groups. Split skin graft also "took" when applied to the surface of a polymer that had been applied to a wound 11 days earlier, again with a thicker result, flush with the surrounding skin. Split skin grafts alone left a persisting depression. However, a significant degree of wound contraction (compared with the other two groups) was observed in the polymer plus delayed graft group. This has prompted further investigation into "sealing" the polymer foam with a membrane, to prevent evaporative water loss, when the foam is to be used as a biodegradable temporizing matrix. The studies indicate that the NovoSorb™ platform will allow the creation of two inexpensive dermal matrix products; an immediate scaffold to allow a thicker grafting result and a biodegradable temporizing matrix (BTM) for wound integration after burn debridement while donor sites become reharvestable. However, further modification on the BTM structure is necessary to further reduce wound contraction pregrafting. PMID:22079917

Greenwood, John Edward; Dearman, Bronwyn Louise

243

7 CFR 273.2 - Office operations and application processing.  

Code of Federal Regulations, 2013 CFR

...Legal obligation and actual child support payments. The...shelters for battered women and children. Residents of shelters for battered women and children who are otherwise entitled...cases, the applicant's identity (i.e., the...

2013-01-01

244

7 CFR 273.2 - Office operations and application processing.  

Code of Federal Regulations, 2010 CFR

...Agriculture (Continued) FOOD AND NUTRITION SERVICE, DEPARTMENT OF AGRICULTURE FOOD STAMP AND FOOD DISTRIBUTION...date of filing of his/her food stamp application is the... For residents of drug addiction or alcoholic treatment...

2009-01-01

245

7 CFR 273.2 - Office operations and application processing.  

Code of Federal Regulations, 2010 CFR

...Agriculture (Continued) FOOD AND NUTRITION SERVICE, DEPARTMENT OF AGRICULTURE FOOD STAMP AND FOOD DISTRIBUTION...date of filing of his/her food stamp application is the... For residents of drug addiction or alcoholic treatment...

2010-01-01

246

47 CFR 25.137 - Application requirements for earth stations operating with non-U.S. licensed space stations.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 false Application requirements for earth stations operating with non-U.S. licensed...COMMUNICATIONS Applications and Licenses Earth Stations § 25.137 Application requirements for earth stations operating with non-U.S....

2010-10-01

247

47 CFR 25.137 - Application requirements for earth stations operating with non-U.S. licensed space stations.  

Code of Federal Regulations, 2010 CFR

...2009-10-01 false Application requirements for earth stations operating with non-U.S. licensed...COMMUNICATIONS Applications and Licenses Earth Stations § 25.137 Application requirements for earth stations operating with non-U.S....

2009-10-01

248

Campaign Planning and Scheduling for Multiproduct Batch Operations with Applications to the Food-Processing Industry  

Microsoft Academic Search

We analyze planning and scheduling of multiproduct batch operations in the food-processing industry. Such operations are encountered in many applications including manufacturing of sorbitol, modified starches, and specialty sugars. Unlike discrete manufacturing, batch sizes in these operations cannot be set arbitrarily, but are often determined by equipment size. Multiple batches of the same product are often run sequentially in ÜcampaignsÝ

Kumar Rajaram; Uday S. Karmarkar

2004-01-01

249

Linguistic Types and the Valence of Operators in Applicative Universal Grammar.  

ERIC Educational Resources Information Center

The relationship between linguistic types and the valence of operators on the genotype level of Applicative Universal Grammar (AUG) is examined. Assuming that the "t" and "s" types may be treated as zero-place operators, a relationship is found between the valence of an operator and its genotype, which explains the difference between types…

Sypniewski, Bernard Paul

250

Time series analysis: a tool for operators training? Application to the direct reduction of ilmenite concentrate  

Microsoft Academic Search

Time series analysis provides a method to analyze and model the behaviour of operators of ilmenite reduction furnaces. The models are used to assess the consistency of actions carried out by operators and to review and improve the training procedures. The application of the method led to a significant reduction in product variability and operating costs of the ilmenite furnaces.

Claude Bazin; Bruno Girard; Daniel Hodouin

2000-01-01

251

An algorithm for selective undo of any operation in collaborative applications  

Microsoft Academic Search

Selective undo allows users to undo any operation in the history and is considered a key feature in collaborative applications. Operational transformation (OT) is a powerful tool for implementing selective undo because it can be used to rearrange operations in a history in arbitrary orders. Despite the significant progress over the past two decades, however, there is still a space

Bin Shao; Du Li; Ning Gu

2010-01-01

252

Operating system support for continuous media applications-RT-Mach extensions  

Microsoft Academic Search

In this paper, we describe operating system support for continuous media applications based on our experience of using the Real-Time Mach microkernel. We first address the limitations of the current workstation operating systems. Then, we discuss operating system support for continuous media from three different points of view: architectural support, resource management support, and programming support. Several Real-Time Mach examples

Hideyuki Tokuda

1995-01-01

253

Metal Matrix Superconductor Composites for SMES-Driven, Ultra High Power BEP Applications: Part 1  

NASA Astrophysics Data System (ADS)

A superconducting magnetic energy storage (SMES) `battery' of order 0.25-1 km diameter is designed to demonstrate theoretical feasibility for large scale beamed energy propulsion (BEP) applications, charging at ~300e MW from solar or nuclear sources, and discharging the full energy load into a gyrotron network in 1-2 minutes. The superconducting coil, whose storage capacity is 2.5 TJ, is made of structural carbon fiber filaments with a superconducting MgCNi3 high current density film surface layer, imbedded in a high electrical and thermal conductivity stabilizer metal, such as copper and/or beryllium. The SMES energy density is compared to other energy storage means and appears superior at the proposed operations scale and prolonged, frequent cycling duty. It is demonstrated that a toroidal coil with solenoidal winding configuration is most effective in specific energy (J/kg). Concurrently the high modulus and yield strength of the coil composite perform well for tensile hoop stress along the winding conductors, as well as transversely, to resist a self generated effective external pressure tending to buckling conditions in the thin walls. As such the toroid cross-section is re-enforced with periodic discrete rings. To achieve this hyper rigidity, the coil composite requires exclusion of traditional soft insulators (like epoxy), making use of a CVD (with tough metal-bonded Al2O3) continuous process of wire insulation and integration into a coil structural lattice, which ultimately needs to withstand very large quench voltages. The coil is built on a modular inflatable mandrel which is removed after assembly. A Part 2 associated paper treats the electromagnetic problem.

Gross, Dan A.; Myrabo, Leik N.

2006-05-01

254

Optical butterfly interconnections and applications in optical logic operations  

NASA Astrophysics Data System (ADS)

In this paper, the optical butterfly interconnections have first been implemented in theory and experiment by using the special reflected interconnect gratings and liquid crystal light valve (LCLV), and two most primitive optical logic operations (AND and OR) have been completed on the basis in parallel. Hence, this work makes the fundamental for more complex digital optical computings.

Sun, Degui; Wang, Na-Xin; Weng, Zhao-Heng

1993-02-01

255

Application of quadratures and operator splitting to partial differential equations  

NASA Astrophysics Data System (ADS)

In this work we study the stability of a method for the numerical solution of initial value problems, that combines finite differences with Simpson's rule. This method is applied to a one spatial dimension, convection-dominated transport problem. To solve the same problem in two spatial dimensions, the proposed method was used in combination with Strang's operator decomposition method.

Sánchez-Bernabe, Francisco J.; Salcedo, J.

2013-02-01

256

Applications of Optimal Building Energy System Selection and Operation  

SciTech Connect

Berkeley Lab has been developing the Distributed Energy Resources Customer Adoption Model (DER-CAM) for several years. Given load curves for energy services requirements in a building microgrid (u grid), fuel costs and other economic inputs, and a menu of available technologies, DER-CAM finds the optimum equipment fleet and its optimum operating schedule using a mixed integer linear programming approach. This capability is being applied using a software as a service (SaaS) model. Optimisation problems are set up on a Berkeley Lab server and clients can execute their jobs as needed, typically daily. The evolution of this approach is demonstrated by description of three ongoing projects. The first is a public access web site focused on solar photovoltaic generation and battery viability at large commercial and industrial customer sites. The second is a building CO2 emissions reduction operations problem for a University of California, Davis student dining hall for which potential investments are also considered. And the third, is both a battery selection problem and a rolling operating schedule problem for a large County Jail. Together these examples show that optimization of building u grid design and operation can be effectively achieved using SaaS.

Marnay, Chris; Stadler, Michael; Siddiqui, Afzal; DeForest, Nicholas; Donadee, Jon; Bhattacharya, Prajesh; Lai, Judy

2011-04-01

257

Banking Intelligence: Application of data warehouse in bank operations  

Microsoft Academic Search

Along with the development of information technology, business intelligence plays an important role in the bank operation process. Bank Intelligence is a method of storing and presenting key bank business data so that anyone in the bank can quickly and easily ask questions of accurate and timely data. In a bank network, hundreds of millions of customer data records are

Zhonglin Lin; Minghua Zhu; Wenjun Yin; Jin Dong

2008-01-01

258

Causal modeling alternatives in operations research: Overview and application  

Microsoft Academic Search

This paper uses the relationships between three basic, fundamental and proven concepts in manufacturing (resource commitment to improvement programs, flexibility to changes in operations, and customer delivery performance) as the empirical context for reviewing and comparing two casual modeling approaches (structural equation modeling and Bayesian networks). Specifically, investments in total quality management (TQM), process analysis, and employee participation programs are

Ronald D. Anderson; Gyula Vastag

2004-01-01

259

An algorithm for enforcement of contact constraints in quasistatic applications using matrix-free solution algorithms  

SciTech Connect

A contact enforcement algorithm has been developed for matrix-free quasistatic finite element techniques. Matrix-free (iterative) solution algorithms such as nonlinear Conjugate Gradients (CG) and Dynamic Relaxation (DR) are distinctive in that the number of iterations required for convergence is typically of the same order as the number of degrees of freedom of the model. From iteration to iteration the contact normal and tangential forces vary significantly making contact constraint satisfaction tenuous. Furthermore, global determination and enforcement of the contact constraints every iteration could be questioned on the grounds of efficiency. This work addresses this situation by introducing an intermediate iteration for treating the active gap constraint and at the same time exactly (kinematically) enforcing the linearized gap rate constraint for both frictionless and frictional response.

Heinstein, M.W. [Sandia National Labs., Albuquerque, NM (United States). Engineering Mechanics and Material Modeling Dept.

1997-10-01

260

Application of the transfer matrix method to reflection gratings in positive and negative index materials  

NASA Astrophysics Data System (ADS)

The transfer matrix method (TMM) has been used to analyze plane wave and beam propagation through linear photonic bandgap structures. Here, we apply TMM to determine the exact spatial behavior of TE and TM waves in periodic refractive index structures of arbitrary thickness. First, we extend the TMM approach to analyze plane wave propagation through Kerr type nonlinear media. Secondly, we analyze second harmonic fields in a 1D nonlinear photonic crystal for arbitrary angle of incidence of the fundamental plane wave. This allows us to construct the overall transfer matrix of nonlinear waves for the whole nonlinear optical structure from all the individual layer transfer matrices. We extend this method to analyze the effect of second order nonlinearity to beam propagation by applying TMM to the angular spectral components of the beam(s).

Aylo, R.; Li, H.; Nehmetallah, G.; Banerjee, P. P.

2012-10-01

261

Design, fabrication, and operation of hybrid bionanodevices for biomedical applications  

NASA Astrophysics Data System (ADS)

Cells are the fundamental building blocks of life. Despite their simplicity, cells are extremely versatile, performing a variety of functions including detection, signaling, and repair. While current biomedical devices operate at the organ level, the next generation will operate at the cellular level, combining the nanoscale machinery of cells with the mechanical robustness of synthetic materials in the form of new hybrid devices. This thesis presents advances in four topics concerning the development of nanomedical devices: fabrication, stabilization, control, and operation. First, as feature sizes decrease from the milli- and microscale towards the nanoscale, new fabrication methods must be developed. A new rapid prototyping technique using confocal microscopy was used to produce freely-programmable high-resolution protein patterns of functional motor proteins on thermo-responsive polymer surfaces. Second, hybrid device operation should be temperature-independent, but most biological components have strong responses to temperature fluctuations. To counter operational fluctuations, the temperature-dependent enzymatic activity was characterized for two types of molecular motors with the goal of developing a bionanosystem which is stabilized against temperature fluctuations. Third, replacing electromechanical systems consisting of pumps and batteries with proteins that directly convert chemical potential into mechanical energy increases the efficiency and decreases the size of the bionanodevice, but requires new control methods. An enzymatic network was developed in which fuel was photolytically released to activate molecular shuttles, excess fuel was sequestered using an enzyme, and spatial and temporal control of the system was achieved. Finally, chemically powered bionanodevices will require high-precision nano- and microscale actuators. A two-part hybrid actuator was designed, which consists of a molecular motor-coated synthetic macroscale forcer and a microtubule-based stator. Methods to create and characterize the stator were developed, which can be used to optimize the force generation of the device.

Tucker, Robert Matthew

262

Matrix-based modeling of blue crab population dynamics with applications to the Chesapeake Bay  

Microsoft Academic Search

Blue crab (Callinectes sapidus) plays an important ecological and economic role in estuaries from South America to New England. It supports a large commercial\\u000a fishery in the United States with approximately one third of the landings taken from Chesapeake Bay. I developed a stage-based\\u000a matrix model of the blue crab population to address three key questions: What is the ability

Thomas J. Miller

2001-01-01

263

Shape description matrix and its applications to color-image retrieval and recognition  

Microsoft Academic Search

Shape description matrix (SDM) describing regional pixel distribution characteristics of images is defined, with both radial\\u000a and angular distribution messages taken into account to offer a comprehensive and exact description of the shape characteristics\\u000a even upon a blurred edge. Using this SDM, a general color histogram (GCH) is developed. Both theoretical and experimental\\u000a results show that the GCH can be

Yi Wang; Hongchen Zhai; Yanmei Liang; Siyuan Zhang; Guoguang Mu

2004-01-01

264

Application of Taguchi techniques to study dry sliding wear behaviour of metal matrix composites  

Microsoft Academic Search

Aluminium metal matrix composites reinforced with SiC and graphite (Gr) particles was prepared by liquid metallurgy route. Dry sliding wear behaviour of the composite was tested and compared with Al\\/SiCp composite. A plan of experiments based on Taguchi technique was used to acquire the data in a controlled way. An orthogonal array and analysis of variance was employed to investigate

S. Basavarajappa; G. Chandramohan; J. Paulo Davim

2007-01-01

265

Application limits in using backscattered radiation for matrix correction in X-ray fluorescence analysis  

Microsoft Academic Search

The known relations of sample element concentration to X-ray fluorescence and backscattered radiation and the correlated cross-sections\\u000a are investigated for atomic numbers between 6 and 92. Calculations were performed using tabulated coefficients. Results show\\u000a that coherent scattered primary radiation cannot be used as a check point for matrix correction. Only incoherent scattering\\u000a on well defined conditions makes it possible to

R. George; M. Schiekel

1983-01-01

266

Nonnegative Matrix Factorization with the Itakura-Saito Divergence: With Application to Music Analysis  

Microsoft Academic Search

This letter presents theoretical, algorithmic, and experimental results about nonnegative matrix factorization (NMF) with the Itakura-Saito (IS) divergence. We describe how IS-NMF is underlaid by a well-defined statistical model of superimposed gaussian components and is equivalent to maximum likelihood estimation of variance parameters. This setting can accommodate regularization constraints on the factors through Bayesian priors. In particular, inverse-gamma and gamma

Cédric Févotte; Nancy Bertin; Jean-louis Durrieu

2009-01-01

267

Application of high-efficiency phosphorescent OLEDs in both passive and active matrix displays  

NASA Astrophysics Data System (ADS)

High-efficiency electrophosphorescent organic light emitting devices (OLEDs), based on triplet emission, is an enabling technology for low power full-color OLED displays. In addition, top emission OLED architectures can be used to maximize display aperture ratio and pixel current densities. In this paper we report on recent results in red, green and blue phosphorescent and top emission OLEDs and discuss the benefits that these attributes have on both active and passive matrix display performance.

Weaver, Michael S.; Brown, Julie J.; Kwong, Raymond C.; Lu, Min-Hao M.; Hack, Michael; Tung, Yeh-Jiun; Chwang, Anna B.; Zhou, Theodore X.

2003-05-01

268

Preliminary Investigation by Raman Spectroscopy of Some Polymeric Matrix with Pharmaceutical Applications  

NASA Astrophysics Data System (ADS)

The possibility to use poly(ethylene oxide) as a polymeric matrix for some pharmaceutical products was analyzed. The behavior of the polymer in the aqueous solutions and the possible interactions between the polymer and the clotrimazole were investigated by Raman spectroscopy. Repeated action of the water on the polymeric conformation is a reversible process and the introduction of the clotrimazole in the polymeric gel do not modify the properties of the active substance of the pharmaceutical product.

Todica, M.; Pop, C. V.; Dinte, E.; Farcau, C.; Astilean, S.

269

Development and Evaluation of Selected Mobility Applications for VII Concept of Operations  

Microsoft Academic Search

This report describes the concept of operations for the three mobility applications that PATH is developing and evaluating under the sponsorship of the FHWA Exploratory Advanced Research Program. These applications are intended to use DSRC wireless communications among vehicles and between vehicles and the roadway infrastructure to improve mobility on limited-access highways. The first application combines ramp metering with variable

Steven E. Shladover; Xiao-Yun Lu; Delphine Cody

270

Potential application of neural networks to the operation of nuclear power plants  

Microsoft Academic Search

The application of neural networks, a rapidly evolving technology used extensively in defense applications, to some of the problems of operating nuclear power plants is a logical complement to the expert systems currently being introduced in some of those plants. The potential applications of neural networks include, but are not limited to: (1) Diagnosing specific abnormal conditions. (2) Identifying nonlinear

Uhrig

1991-01-01

271

Application of dynamic neural networks in the modeling of drug release from polyethylene oxide matrix tablets.  

PubMed

The main objective of this study was to demonstrate the possible use of dynamic neural networks to model diclofenac sodium release from polyethylene oxide hydrophilic matrix tablets. High and low molecular weight polymers in the range of 0.9-5 x 10(6) have been used as matrix forming materials and 12 different formulations were prepared for each polymer. Matrix tablets were made by direct compression method. Fractions of polymer and compression force have been selected as most influential factors on diclofenac sodium release profile. In vitro dissolution profile has been treated as time series using dynamic neural networks. Dynamic networks are expected to be advantageous in the modeling of drug release. Networks of different topologies have been constructed in order to obtain precise prediction of release profiles for test formulations. Short-term and long-term memory structures have been included in the design of network making it possible to treat dissolution profiles as time series. The ability of network to model drug release has been assessed by the determination of correlation between predicted and experimentally obtained data. Calculated difference (f(1)) and similarity (f(2)) factors indicate that dynamic networks are capable of accurate predictions. Dynamic neural networks were compared to most frequently used static network, multi-layered perceptron, and superiority of dynamic networks has been demonstrated. The study also demonstrated differences between the used polyethylene oxide polymers in respect to drug release and suggests explanations for the obtained results. PMID:19632323

Petrovi?, Jelena; Ibri?, Svetlana; Betz, Gabriele; Parojci?, Jelena; Duri?, Zorica

2009-07-24

272

Block-Diagonalization of Operators with Gaps, with Applications to Dirac Operators  

NASA Astrophysics Data System (ADS)

We present new results on the block-diagonalization of operators with spectral gaps, based on a method of Langer and Tretter, and apply them to Dirac operators on three-dimensional Euclidean space with unbounded potentials. For the Coulomb potential, we achieve an exact diagonalization up to nuclear charge Z = 124 (which covers all chemical elements) and prove the convergence of an approximate block-diagonalization up to Z = 62, thus considerably improving the upper bounds Z = 93 and Z = 51, respectively, established by Siedentop and Stockmeyer.

Cuenin, Jean-Claude

2012-09-01

273

Imaging with tilted surfaces: an efficient matrix method for the generalized Scheimpflug condition and its application to rotationally symmetric triangulation  

NASA Astrophysics Data System (ADS)

An efficient two-dimensional matrix method is presented that facilitates the design of optical systems with tilted surfaces for which the requirement or knowledge of the orientation of the image plane is necessary, i.e., for which a generalized Scheimpflug condition is needed. In more general terms, the method results in imaging properties of second-order expansion, but the method is linear. Therefore the complexity of the design process is considerably reduced. The strength of the design method is demonstrated in detail for a novel application in which a reflective optical system of several surfaces is required for rotationally symmetric triangulation.

Ott, Peter

2005-06-01

274

Electrical power distribution system operating experience review for fusion applications  

Microsoft Academic Search

This paper describes safety research on electrical distribution systems applicable to fusion facilities. Electrical power has many uses in both magnetic and inertial fusion experiments; it is the most important support system for any fusion experiment. Electricity powers a wide variety of plant equipment, including vacuum pumps, magnets, coolant pumps, air handlers, compressors, and either plasma heating or target implosion

L. C Cadwallader

2002-01-01

275

SevenOperators, a Mathematica script for harmonic oscillator nuclear matrix elements arising in semileptonic electroweak interactions  

Microsoft Academic Search

Semi-leptonic electroweak interactions in nuclei - such as \\\\beta decay, \\\\mu\\u000acapture, charged- and neutral-current neutrino reactions, and electron\\u000ascattering - are described by a set of multipole operators carrying definite\\u000aparity and angular momentum, obtained by projection from the underlying nuclear\\u000acharge and three-current operators. If these nuclear operators are approximated\\u000aby their one-body forms and expanded in the

Wick Haxton; Cecilia Lunardini

2008-01-01

276

Process Design for Operability: A Styrene Polymerization Application  

Microsoft Academic Search

: Steady-state multiplicity analysis is used to study the operability of a jacketed exothermic styrene polymerizationCSTR. Low and high temperature infeasibility regions are shown to occur under certain design conditions.The approach developed is based on using a combination of analytical and numerical techniques to guide the analysis,rather than using a purely numerical approach. A reactor design used by previous researchers

Louis P. Russo; B. Wayne Bequette

1997-01-01

277

Application of Reactive Barriers Operated in Frozen Ground  

Microsoft Academic Search

Permeable reactive barriers allow passive treatment of contaminated groundwater. Barriers, filled with reactive media, are\\u000a able to treat a wide range of contaminants including dissolved nutrients and metals, petroleum hydrocarbons and chlorinated\\u000a organic compounds. Advantages for areas of frozen ground include low energy requirements, the ability to function unattended,\\u000a and a low cost of operation. Although freeze-thaw cycling poses additional

Damian B. Gore

278

Nonequilibrium density matrix for quantum transport: Hershfield approach as a McLennan-Zubarev form of the statistical operator  

NASA Astrophysics Data System (ADS)

In this paper, we formally demonstrate that the nonequilibrium density matrix developed by Hershfield for the steady state has the form of a McLennan-Zubarev nonequilibrium ensemble. The correction term in this pseudoequilibrium Gibbs-like ensemble is directly related to the entropy production in the quantum open system. The fact that both methods state that a nonequilibrium steady state can be mapped onto a pseudoequilibrium, permits us to develop nonequilibrium quantities from formal expressions equivalent to the equilibrium case. We provide an example: the derivation of a nonequilibrium distribution function for the electron population in a scattering region in the context of quantum transport.

Ness, H.

2013-08-01

279

Pipe line pigs have varied applications in operations. Part 2  

SciTech Connect

In the early days of pipelining, it was discovered that running a swab equipped with leather disks through the line removed paraffin deposited on the pipe wall increasing the flow without increasing the power input. Blades were added to the device later to improve the efficiency of wax removal, which also decreased the number of runs and the cost of pigging. Pig developers learned from their successes as well as their failures. Part 1 of this work focused on the construction and kaliper pigs, and the second part describes the general form and function of the different operational pigs, i.e., calipers, cleaners, and spheres.

Vernooy, B.

1980-10-01

280

Operation and areas of application for pipeline pigs  

SciTech Connect

Pigs are used daily in the operation and construction of pipelines. They may be used for a variety of reasons: (1) to clean and increase line efficiency; (2) to gage or survey the inside diameter of the pipe; (3) to separate products; and (4) to dewater lines after hydrostatic testing or for a number of other reasons. Data pertinent to pigs and pigging techniques are discussed with relation to these functions. In the first function, pigs are used to improve and maintain internal pipe cleanliness by removing contaminants and deposits in the pipe. Periodic line cleaning with pigs can be used in conjunction with corrosion mitigation measures to ensure capacity flow and rate.

Not Available

1981-01-01

281

Non-negative matrix factorization of two-dimensional NMR spectra: Application to complex mixture analysis  

NASA Astrophysics Data System (ADS)

A central problem in the emerging field of metabolomics is how to identify the compounds comprising a chemical mixture of biological origin. NMR spectroscopy can greatly assist in this identification process, by means of multi-dimensional correlation spectroscopy, particularly total correlation spectroscopy (TOCSY). This Communication demonstrates how non-negative matrix factorization (NMF) provides an efficient means of data reduction and clustering of TOCSY spectra for the identification of unique traces representing the NMR spectra of individual compounds. The method is applied to a metabolic mixture whose compounds could be unambiguously identified by peak matching of NMF components against the BMRB metabolomics database.

Snyder, David A.; Zhang, Fengli; Robinette, Steven L.; Bruschweiler-Li, Lei; Brüschweiler, Rafael

2008-02-01

282

Interaction between reinforce carbon black and polymeric matrix for industrial applications  

NASA Astrophysics Data System (ADS)

In this work the interaction between the carbon black reinforcement agent and a polymeric rubber matrix is investigated. Chemical activity of carbon black powder samples was enhanced using ? radiation in the dose range 168-1000 kGy and the radiation induced free radical concentration was investigated by EPR measurements. Activated powder samples were mixed with rubber and the bound rubber values of obtained compounds was measured by TG analysis. A comparison between EPR and bound rubber data shows that the greatest filler-polymer chemical interaction corresponds to the highest radiation induced free radical concentration.

Baccaro, S.; Cataldo, F.; Cecilia, A.; Cemmi, A.; Padella, F.; Santini, A.

2003-08-01

283

Finding Nonoverlapping Substructures of a Sparse Matrix  

SciTech Connect

Many applications of scientific computing rely on computations on sparse matrices. The design of efficient implementations of sparse matrix kernels is crucial for the overall efficiency of these applications. Due to the high compute-to-memory ratio and irregular memory access patterns, the performance of sparse matrix kernels is often far away from the peak performance on a modern processor. Alternative data structures have been proposed, which split the original matrix A into A{sub d} and A{sub s}, so that A{sub d} contains all dense blocks of a specified size in the matrix, and A{sub s} contains the remaining entries. This enables the use of dense matrix kernels on the entries of A{sub d} producing better memory performance. In this work, we study the problem of finding a maximum number of nonoverlapping dense blocks in a sparse matrix, which is previously not studied in the sparse matrix community. We show that the maximum nonoverlapping dense blocks problem is NP-complete by using a reduction from the maximum independent set problem on cubic planar graphs. We also propose a 2/3-approximation algorithm that runs in linear time in the number of nonzeros in the matrix. This extended abstract focuses on our results for 2x2 dense blocks. However we show that our results can be generalized to arbitrary sized dense blocks, and many other oriented substructures, which can be exploited to improve the memory performance of sparse matrix operations.

Pinar, Ali; Vassilevska, Virginia

2005-08-11

284

The HDTV digital audio matrix  

NASA Astrophysics Data System (ADS)

Multichannel sound systems are being studied as part of the Eureka 95 and Radio-communication Bureau TG10-1 investigations into high definition television. One emerging sound system has five channels; three at the front and two at the back. This raises some compatibility issues. The listener might have only, say, two loudspeakers or the material to be broadcast may have fewer than five channels. The problem is how best to produce a set of signals to be broadcast, which is suitable for all listeners, from those that are available. To investigate this area, a device has been designed and built which has six input channels and six output channels. Each output signal is a linear combination of the input signals. The inputs and outputs are in AES/EBU digital audio format using BBC-designed AESIC chips. The matrix operation, to produce the six outputs from the six inputs, is performed by a Motorola DSP56001. The user interface and 'housekeeping' is managed by a T222 transputer. The operator of the matrix uses a VDU to enter sets of coefficients and a rotary switch to select which set to use. A set of analog controls is also available and is used to control operations other than the simple compatibility matrixing. The matrix has been very useful for simple tasks: mixing a stereo signal into mono, creating a stereo signal from a mono signal, applying a fixed gain or attenuation to a signal, exchanging the A and B channels of an AES/EBU bitstream, and so on. These are readily achieved using simple sets of coefficients. Additions to the user interface software have led to several more sophisticated applications which still consist of a matrix operation. Different multichannel panning laws have been evaluated. The analog controls adjust the panning; the audio signals are processed digitally using a matrix operation. A digital SoundField microphone decoder has also been implemented. matrix operation, the analog controls being used to adjust the characteristics of the decoded microphone. &DSP software for specific tasks not requiring operator control has also been used. Adaptive filtering and signal restoration are two examples. The transputer in this case can be left to perform the housekeeping. *The design of the HDTV digital audio matrix is such that it can be applied to a wide variety of signal processing tasks. -The combination of a dedicated DSP chip programmed in assembly language for speed of operation and a general purpose processor for user interface tasks programmed in a high level language has been found to be extremely useful.

Mason, A. J.

285

Studies on Swelling Behavior of HPMC based Matrix Tablets by the Application of Digital Imaging Technique  

Microsoft Academic Search

The widespread application of hydrogels in a number of applications like control of microfluidic flow, development of muscle-like actuators, filtration\\/separation and drug delivery makes it important to properly understand these materials. Understanding hydrogel properties is also important from the standpoint of their similarity to many biological tissues. The degree of swelling as well as the rate of swelling of the

Irwin Dewan; Reza-ul Jalil

2009-01-01

286

Application of Mueller matrix spectroscopic ellipsometry to determine line edge roughness on photomasks  

NASA Astrophysics Data System (ADS)

We report on Mueller Matrix spectroscopic ellipsometry (MM-SE) to examine undesired asymmetries in structural parameters, i.e. line edge roughness (LER). The investigation was done on a photomask containing line space arrays with intentionally modulated line edges. The Mueller Matrix (MM) elements were measured within the complete azimuth angle range (0 - 360°) and a wavelength range from 300 nm to 980 nm. The results are presented in polar coordinates with the azimuth angle and wavelength as the angular and radial coordinate, respectively. It was found that LER significantly impacts the MM elements, which is indicated by the increase of the isotropic character of the array. The experimental data are confirmed by Rigorous Coupled Wave Analysis (RCWA) simulations on perturbed arrays. Based on RCWA the impact of LER amplitudes in the nm range is determined. It was found that both deviation of critical dimension (CD) and LER amplitude impact the MM elements. Based on the intensity ratios of the elements and their spectral distribution both errors create a characteristic finger print, which allows to separate them. Finally, the required measurement precision for LER in the nm range is estimated at 0.001. This precision is challenging but achievable with today's metrology.

Heinrich, A.; Dirnstorfer, I.; Bischoff, J.; Richter, U.; Ketelson, H.; Meiner, K.; Mikolajick, T.

2013-10-01

287

Fabrication of nanocrystallites in the SiOx matrix applicable in microelectronics  

NASA Astrophysics Data System (ADS)

The development of the technology of fabricating hydrogenated amorphous silicon (a-Si:H) or silicon oxide (SiOx) matrix with nanocrystalline inclusions (nc-Si:H) is the next step in improving the properties of electronic devices, such as solar cells, thin film transistors (TFT), floating gate transistors and others. Those films exhibit increased stability, absorption and carrier mobility. This paper is focused on the technology of manufacturing such films by means of Radio Frequency Plasma Enhanced Chemical Vapor Deposition (RF PECVD), which is use to fabricate electronic devices. The technology was developed in the Semiconductor Thin Films and Solar Cells Laboratory at the Department of Electronics at the AGH University of Science and Technology. The author describes the manufacturing process based on periodical variation of the process parameters, such as hydrogen to silane ratio (Rh), gas flows, RF power and pressure in the process chamber, during the deposition process. The author also presents the results of the measurements of typical samples with High Resolution Transmission Electron Microscopy (HRTEM), which confirms the existence of the nanocrystallites in the a-Si:H/SiOx matrix.

Kolodziej, Tomasz

2013-07-01

288

In-Situ growth of cadmium telluride nanocrystals in poly(3-hexylthiophene) matrix for photovoltaic application  

NASA Astrophysics Data System (ADS)

In the present study, nanocrystals of cadmium telluride (CdTe) have been directly synthesized in poly(3-hexylthiophene) (P3HT) matrix without use of any surfactant. In situ synthesis of nanoparticles in polymer matrix improves the polymer-nanoparticles interface, which facilitates efficient electronic interaction between them. Spectral results suggest that CdTe nanocrystals are bound with P3HT via dipole-dipole interaction and form a charge transfer complex. Structural and morphological studies reveal that CdTe works as transport media along/between the polymer chains, which facilitate percolation pathways for charge transport. Therefore, enhancement in current density has been observed for the bulk heterojunction (BHJ) device of P3HT-CdTe nanocomposites blended with PCBM. An open circuit voltage (VOC) of 0.80 V was obtained from the BHJ device due to the increase in the energy level offset between the donor and acceptor. This new photovoltaic element could provide a new nanoscale criterion for the investigation of photoinduced energy/charge transport in organic-inorganic interfaces.

Taukeer Khan, Mohd; Kaur, Amarjeet; Dhawan, S. K.; Chand, Suresh

2011-08-01

289

MOCAGE-accident: From research to operational applications  

NASA Astrophysics Data System (ADS)

MOCAGE (Modèle de Chimie Atmosphérique à Grande Echelle) is the multi-scale 3D Chemistry and Transport Model of Météo-France. From air quality forecasting to the study of interactions between climate and chemistry, MOCAGE is a flexible tool that is currently used for both research on atmospheric composition (over 35 publications in the international literature) and operations in Météo-France and at several collaborating institutes. In particular, MOCAGE products are used for the French operational Air Quality platform Prév'Air as well as in projects building up the GMES Atmospheric Service. Here, we present a new specific configuration "MOCAGE-accident”, currently used in pre-operations trial by Météo-France forecasters, in support of our international responsibilities as RSMC (Regional Meteorological Specialized Centre) and VAAC (Volcanic Ash Advisory Centre). Briefly, a semi-lagrangian scheme is used for advection (Williamson and Rash, 1989), while turbulent diffusion, using the Louis scheme (Louis, 1979) and convection, using the Bechtold scheme (Kain and Fritsch, 1990 and Bechtold, 2001) are parameterized. In the specific "accident” configuration, no chemical reactions are considered and a module allows to specify the temporal and geometrical characteristics of the release. Three types of pollutants can be considered : - tracers: no interactions between this tracer and the other atmospheric components are considered ; only transport, wet and dry deposition are taken into account. - radionucleides: in this case, radioactive disintegration is treated following the type of radionuclide and its lifetime. - volcanic ashes: solid materials are considered and sedimentation of the particles is also considered. Concerning the current pre-operations trial, the horizontal resolution of MOCAGE-accident is 0,5° all over the globe, with 47 levels from surface to 5 hPa. This model is thus able to represent accidental emissions on every place of the world, in troposphere and lower stratosphere. Dispersion and deposition forecasts strongly depend on the meteorological forecast fields used as an input. Within MOCAGE-accident, the choice of the NWP trajectory is left to the forecaster, who has several options for global forecasts depending upon his appreciation of the best NWP model in the area and in the period concerned with the accidental or volcanic release. An interesting additional capability of MOCAGE-accident is to calculate backwards 3D simulations, using its adjoint. This backtracking mode is used in Near-Real-Time to infer location and release period of possible nuclear explosions, in the context of a collaborative network of international centres jointly set up by the secretariats of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) and the World Meteorological Organization (WMO). An example from a recent exercise will be illustrated. Last, on-going research activities targeted at improving performance and assessing uncertainties will be shown. We will focus on the use of two types of ensemble approaches that have been tested: - using a range of different dispersion models, relying on the same meteorological forecasts or not. This is done in the context of the ENSEMBLE project. - using only MOCAGE-accident, but driven by meteorological fields from the members of Ensemble Predictions Systems.

Martet, M.; Josse, M.; Peuch, Mr.; Peuch, M.; Bonnardot, Mr.

2009-09-01

290

Application Study on Monitoring a Large Power Plant Operation  

NASA Astrophysics Data System (ADS)

Upon close examination of a set of industrial data from a large scale power plant, time varying behavior are discovered. If a fixed model is applied to monitor this process, false alarms will be inevitable. This paper suggests the use of adaptive models to cope with such situation. A recently proposed technique, fast algorithm for Moving Window Principal Component Analysis (MWPCA) was employed because of its following strength: (i) the ability in adapting process changes, (ii) the conceptual simplicity, and (iii) its computational efficiency. Its advances in fault detection is demonstrated in the paper by comparing with the conventional PCA. In addition, this paper proposed to plot the scaled variables in conjunction with MWPCA for fault diagnosis, which is proved to be effective in this application.

Li, Pingkang; Wang, Xun; Du, Xiuxia

291

Community Noise Exposure Resulting from Aircraft Operations: Application Guide for Predictive Procedure.  

National Technical Information Service (NTIS)

This report is one of a series describing the research program undertaken by the Aerospace Medical Research Laboratory to develop procedures for predicting the community noise exposure resulting from aircraft operations. It discusses the applications of t...

D. E. Bishop

1974-01-01

292

40 CFR 63.747 - Standards: Chemical milling maskant application operations.  

Code of Federal Regulations, 2013 CFR

...NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES (CONTINUED) National Emission Standards for Aerospace Manufacturing and Rework Facilities § 63.747 Standards: Chemical milling maskant application operations....

2013-07-01

293

Operational Status and Current Trends in Gas Turbines for Utility Applications in Europe.  

National Technical Information Service (NTIS)

This investigation was conducted to ascertain the operational status and current trends in gas turbines for electric utility applications in Europe. A number of selected organizations were contacted by letter and personal visits and readily available pert...

R. A. Harmon

1976-01-01

294

Non-Lethal Weapons: MEF Application in Joint High Intensity Conflict Battle Field Operations.  

National Technical Information Service (NTIS)

The scope of this paper covers current and future NLW technology most likely to have an application in MEF high intensity battlefield operations. These principally include but are not limited to Chemical (Sleep Agents), Electro-Magnetic (Non Nuclear Elect...

J. R. Rizzo

1998-01-01

295

77 FR 67837 - Callaway Plant, Unit 1; Application for Amendment to Facility Operating License  

Federal Register 2010, 2011, 2012, 2013

...Regulatory Commission. ACTION: License amendment application; withdrawal...amendment to Facility Operating License No. NPF-30 for the Callaway...for achieving the heat removal rate assumed in the Callaway...September 10, 2012, and the license's letter dated October...

2012-11-14

296

Storage of Ag nanoparticles in pore-arrays of SU-8 matrix for antibacterial applications  

NASA Astrophysics Data System (ADS)

Silver nanoparticles (NPs) stored in pore-arrays (pa) SU-8 photoresist layer were utilized as an antibacterial nanocomposition against E. coli bacteria. The pa-SU-8 matrix was fabricated by an optical interference lithography method resulting in small pores with a diameter of ~50 nm and a depth of ~100 nm. The Ag NPs were deposited on the soft polymeric matrix at different drying temperatures of 50 and 90 °C. X-ray photoelectron spectroscopy showed that the deposited silver NPs were substantially in the metallic state, independent from the drying condition. However, the concentration of the immobilized Ag NPs on the film surface increased (by a factor of 2.5) at the higher drying temperature. This increase was consistently observed in the strengthening of the surface plasmon resonance absorption peak of the Ag NPs. The size of the Ag NPs released from the Ag NPs/pa-SU-8 film was found to be in the range 7-15 nm. Antibacterial activity of the Ag NPs/pa-SU-8 films was investigated at different temperatures (37, 55 and 75 °C) of the solution containing the film. The relative rate of reduction of the viable bacteria was calculated to be 4.5 × 10-2 (2.8 × 10-2) min-1 at 37 °C, for the film dried at 90 (50) °C. By increasing the temperature to 75 °C, the rate of reduction increased to 8.4 × 10-2 (4.1 × 10-2) min-1, corresponding to 60 (120) min required time to kill all the bacteria. Silver ion release measurements showed that the higher drying temperature (90 °C) provided more diffusion of Ag NPs in the porous soft matrix to store a considerable amount of Ag NPs in it, resulting in a lasting antibacterial activity. The amount of silver released from the Ag NPs/pa-SU-8 film, and thus its antibacterial activity, can be controlled by small variation (~20 °C) of the environmental temperature.

Akhavan, O.; Abdolahad, M.; Asadi, R.

2009-07-01

297

Sensitivity-based operational mode shape normalisation: Application to a bridge  

Microsoft Academic Search

Recently, an innovative sensitivity-based technique was introduced for the normalisation of operational mode shapes purely on a basis of output-only data. The technique is based on the use of a controlled mass modification experiment and does not involve any analytical models. Moreover, it allows to extend the applicability of many modal analysis based applications towards the domain of in-operation modal

E. Parloo; B. Cauberghe; F. Benedettini; R. Alaggio; P. Guillaume

2005-01-01

298

Application-specific service technologies for commodity operating systems in real-time environments  

Microsoft Academic Search

In order to eliminate the costs of proprietary systems and special purpose hardware, many real-time and embedded computing platforms are being built on commodity operating systems and generic hardware. Unfortunately, many such systems are ill-suited to the low-latency and predictable timing requirements of real-time applications. This article, therefore, focuses on application-specific service technologies for low-cost commodity operating systems and hardware,

Richard West; Gabriel Parmer

2011-01-01

299

Application-Specific Service Technologies for Commodity Operating Systems in Real-Time Environments  

Microsoft Academic Search

In order to eliminate the costs of proprietary systems and special purpose hardware, many real-time and em- bedded computing platforms are being built on commod- ity operating systems and generic hardware. Unfortunately, many such systems are ill-suited to the low-latency and predictable timing requirements of real-time applications. This paper, therefore, focuses on application-specific ser- vice technologies for low-cost commodity operating

Richard West; Gabriel Parmer

2006-01-01

300

Two-dimensional R-matrix propagator: Application to electron-hydrogen scattering  

NASA Astrophysics Data System (ADS)

The two-dimensional R-matrix propagator of Le Dourneuf et al. [J. Phys. B 23, L559 (1990)] is generalized to arbitrary angular momenta and applied to the study of electron-hydrogen collisions at energies up to the n=5 threshold. Results are presented for phase shifts, resonance positions and widths, as well as cross sections for partial waves of total angular momenta L<=3. The stability and efficiency of the method are established. A comparison is made below the n=3 threshold with results from other theories. Agreement is very good, in particular with the results of a finite-difference numerical integration of the Schrödinger equation by Wang and Callaway [Phys. Rev. A 50, 2327 (1994)]. Partial cross sections for 1S between the n=3 and 5 thresholds illustrate the potential of the method for studying excitation into high Rydberg states.

Dunseath, K. M.; Le Dourneuf, M.; Terao-Dunseath, M.; Launay, J.-M.

1996-07-01

301

The application of Positive Matrix Factorization (PMF) to eco-efficiency analysis.  

PubMed

A new method for weighting and aggregating eco-efficiency indicators is of the utmost importance, if researchers in the field are to provide simplified and physically meaningful information to policy makers. To date, there is still considerable debate over which weighting and aggregating methods to use in this context. We apply a new variant of factor analysis, Positive Matrix Factorization (PMF), to a simple eco-efficiency analysis case study. PMF constrains its solutions to be non-negative, providing two important advantages over traditional factor analysis (FA) or principal component analysis (PCA): the rotational ambiguity of the solution space is reduced, and all the results are guaranteed to be physically meaningful. We suggest that PMF is better choice than either FA or PCA for eco-efficiency indicators, especially when dealing with complex social-economic and environmental data. PMID:22325638

Wu, Jiaying; Wu, Zhijun; Holländer, Robert

2012-01-08

302

Application of positive matrix factorization to identify potential sources of PAHs in soil of Dalian, China.  

PubMed

Soil derived sources of polycyclic aromatic hydrocarbons (PAHs) in the region of Dalian, China were investigated using positive matrix factorization (PMF). Three factors were separated based on PMF for the statistical investigation of the datasets both in summer and winter. These factors were dominated by the pattern of single sources or groups of similar sources, showing seasonal and regional variations. The main sources of PAHs in Dalian soil in summer were the emissions from coal combustion average (46%), diesel engine (30%), and gasoline engine (24%). In winter, the main sources were the emissions from coal-fired boiler (72%), traffic average (20%), and gasoline engine (8%). These factors with strong seasonality indicated that coal combustion in winter and traffic exhaust in summer dominated the sources of PAHs in soil. These results suggested that PMF model was a proper approach to identify the sources of PAHs in soil. PMID:19201072

Wang, Degao; Tian, Fulin; Yang, Meng; Liu, Chenlin; Li, Yi-Fan

2009-02-07

303

Development and characterization of starch nanoparticles by gamma radiation: potential application as starch matrix filler.  

PubMed

Gamma radiation arises as an advantageous alternative to obtain starch nanoparticles given its low cost, simple methodology and scalability. Starch nanoparticles (SNP) with sizes around 20 and 30 nm were obtained applying a dose of 20 kGy from cassava (CNP-?) and waxy maize (WNP-?) starch, respectively. They showed the same thermal degradation behavior and their maximum mass loss zone was similar to those nanoparticles obtained from acid hydrolysis (WNP-h). Additionally, CNP-? and WNP-? were used as nanofillers in a cassava matrix. Increments of 102% in storage modulus were obtained with the addition of only 2.5 wt.% of WNP-?, showing that gamma radiation is a successful methodology to obtain SNP able to be used as starch reinforcement. PMID:23769521

Lamanna, Melisa; Morales, Noé J; García, Nancy Lis; Goyanes, Silvia

2013-05-03

304

Verification of operating software for cooperative monitoring applications  

SciTech Connect

Monitoring agencies often use computer based equipment to control instruments and to collect data at sites that are being monitored under international safeguards or other cooperative monitoring agreements. In order for this data to be used as an independent verification of data supplied by the host at the facility, the software used must be trusted by the monitoring agency. The monitoring party must be sure that the software has not be altered to give results that could lead to erroneous conclusions about nuclear materials inventories or other operating conditions at the site. The host might also want to verify that the software being used is the software that has been previously inspected in order to be assured that only data that is allowed under the agreement is being collected. A description of a method to provide this verification using keyed has functions and how the proposed method overcomes possible vulnerabilities in methods currently in use such as loading the software from trusted disks is presented. The use of public key data authentication for this purpose is also discussed.

Tolk, K.M.; Rembold, R.K.

1997-08-01

305

Characterization of aluminum metal-matrix composite (MMC) for lightweight space optics application: a study of thermal expansion behavior of MMC in simulated space thermal environment  

NASA Astrophysics Data System (ADS)

Application of advanced composite material for lightweight mirror for space optics needs to know the exact thermal expansion behavior of the composite in space thermal environment. In this paper, thermal expansion behaviors of plasma thermal sprayed and powder metallurgy processed ceramic particulate reinforced aluminum metal-matrix composites in simulated space thermal environment were studied. Thermal cycling was found to cause hysteresis and non-linear thermal expansion responses to the composites when the thermal stress within the composite exceeds the yield strength of the matrix, and subsequently causes matrix plastic flow. High matrix yield strength is necessary for MMC to have linear, stable and repeatable thermal expansion response in severe space thermal environment. The study lays out a fundamental for choosing existed or developing a new MMC for lightweight mirror application.

Jiang, Xin X.; Nikanpour, Darius

2000-10-01

306

A matrix lower bound  

SciTech Connect

A matrix lower bound is defined that generalizes ideas apparently due to S. Banach and J. von Neumann. The matrix lower bound has a natural interpretation in functional analysis, and it satisfies many of the properties that von Neumann stated for it in a restricted case. Applications for the matrix lower bound are demonstrated in several areas. In linear algebra, the matrix lower bound of a full rank matrix equals the distance to the set of rank-deficient matrices. In numerical analysis, the ratio of the matrix norm to the matrix lower bound is a condition number for all consistent systems of linear equations. In optimization theory, the matrix lower bound suggests an identity for a class of min-max problems. In real analysis, a recursive construction that depends on the matrix lower bound shows that the level sets of continuously differential functions lie asymptotically near those of their tangents.

Grcar, Joseph F.

2002-02-04

307

10 CFR 2.103 - Action on applications for byproduct, source, special nuclear material, facility and operator...  

Code of Federal Regulations, 2013 CFR

...applications for byproduct, source, special nuclear material, facility and operator licenses. 2.103 Section 2.103 Energy NUCLEAR REGULATORY COMMISSION AGENCY RULES OF...applications for byproduct, source, special nuclear material, facility and operator...

2013-01-01

308

40 CFR Table 1 to Subpart Vvvvvv... - Hazardous Air Pollutants Used To Determine Applicability of Chemical Manufacturing Operations  

Code of Federal Regulations, 2013 CFR

...Pollutants Used To Determine Applicability of Chemical Manufacturing Operations 1 Table...Standards for Hazardous Air Pollutants for Chemical Manufacturing Area Sources Pt. 63...Pollutants Used To Determine Applicability of Chemical Manufacturing Operations As...

2013-07-01

309

Operational status and current trends in gas turbines for utility applications in Europe  

Microsoft Academic Search

This investigation was conducted to ascertain the operational status and current trends in gas turbines for electric utility applications in Europe. A number of selected organizations were contacted by letter and personal visits and readily available pertinent literature was reviewed. The impact of business recovery in 1976 and increases in power demand on gas turbine operation and design trends is

1976-01-01

310

A Review of Operations Research Applications in Workforce Planning and Potential Modelling of Military Training  

Microsoft Academic Search

This report presents the review of workforce planning applications of operations research and explores potential modelling of military training. We classify the operations research techniques applied in workforce planning into four major branches: Markov chain models, computer simulation models, optimisation models and supply chain management through System Dynamics. For each of these, we outline the underlying mathematical formalism and concepts,

Jun Wang

311

Adaptive power controllable retrodirective array system for portable battery-operated applications  

Microsoft Academic Search

An adaptive power controllable retrodirective array system is presented for portable applications. The proposed system is able to turn on only when it needs to operate so that it can avoid wasting battery power in idle mode. This power management is accomplished by employing a rectenna and an analog switch into a battery-operated system. When an RF signal is received

Sungjoon Lim; Kevin M. K. H. Leong; Tatsuo Itoh

2005-01-01

312

Evaluation of the Trajectory Operations Applications Software Task (TOAST). Volume 2: Interview Transcripts.  

National Technical Information Service (NTIS)

The Trajectory Operations Applications Software Task (TOAST) is a software development project whose purpose is to provide trajectory operation pre-mission and real-time support for the Space Shuttle. The purpose of the evaluation was to evaluate TOAST as...

S. Perkins A. Martin B. Bavinger

1990-01-01

313

Applying SWOT Analysis in Formulation of Propositions for more Effective Operational Application of Timeshare in Greece  

Microsoft Academic Search

The present paper aims to suggest specific actions- proposals for policies likely to counteract the difficulties involved in the operational application of Timeshare in Greece. The choice of the S.W.O.T. Analysis methodology can be accounted for by the fact that it enables the detection of strengths and weaknesses as they manifest themselves in the internal operational environment of the Greek

Theodoros Stavrinoudis

2007-01-01

314

Application of the Operational Art to the NATO (North Atlantic Treaty Organization) Air Element.  

National Technical Information Service (NTIS)

This study examines the applicability of the operational art practiced by land commander to air campaign planning. It focuses on the role of U.S. Army Air Defense systems in operational maneuver and particularly seeks to determine if the same basic tenets...

R. E. Curry

1989-01-01

315

Ontological Approach to Developing Information Operations Applications for use on the Semantic Web.  

National Technical Information Service (NTIS)

Information Operations (IO) have the potential to alter the landscape of modern warfare through the sustained application of a broad spectrum of kinetic and non-kinetic effects. Operations of this type offer the benefit of reducing the scope of direct con...

T. L. Clarke

2008-01-01

316

Ontological Approach to Developing Information Operations Applications for Use on the Semantic Web.  

National Technical Information Service (NTIS)

Information Operations (IO) have the potential to alter the landscape of modern warfare through the sustained application of a broad spectrum of kinetic and non-kinetic effects. Operations of this type offer the benefit of reducing the scope of direct con...

T. L. Clarke

2008-01-01

317

Bank branch operating efficiency: A comparative application of DEA and the loglinear model  

Microsoft Academic Search

In this paper, a comparison regarding the operational efficiency of individual branches of a bank is made, through the application to the same body of data of two different estimation methods: (i) Data Envelopment Analysis (DEA) and (ii) Loglinear Model Analysis. In addition to that, the study examines whether operations in the bank branches were conducted in regions of increasing,

DI Giokas

1991-01-01

318

The impact of operating system scheduling policies and synchronization methods of performance of parallel applications  

Microsoft Academic Search

Shared-memory multiprocessors are frequently used as compute servers with multiple parallel applications executing at the same time. In such environments, the efficiency of a parallel application can be significantly affected by the operating system scheduling policy. In this paper, we use detailed simulation studies to evaluate the performance of several different scheduling strategies, These include regular priority scheduling, coscheduling or

Anoop Gupta; Andrew Tucker; Shigeru Urushibara

1991-01-01

319

Application of Energy-Saving Clean-Field Technique in Operating Theaters.  

National Technical Information Service (NTIS)

The aim of this research work was to study the applicability and hygienic effectiveness of the Clean-Field Technique (CFT) under clinical conditions in surgery. After application of the CFT in operating theaters of general surgery, bone and traumatic surg...

H. Esdorn Z. Nouri

1981-01-01

320

Towards a theory of management and evaluation of operational enterprise resource planning applications  

Microsoft Academic Search

Enterprise resource planning (ERP) applications are the most ubiquitous of business information systems. They impact almost all business functions, bringing control and providing information. Some of these applications have already been operational for 20 years and this longevity has changed the way in which management of information systems is envisaged. Traditionally, information systems had a lifespan of perhaps five to

Richard Fulford

2008-01-01

321

27 CFR 71.49a - Applications for operating permits and industrial use permits.  

Code of Federal Regulations, 2013 CFR

...PRACTICES RULES OF PRACTICE IN PERMIT PROCEEDINGS Grounds for Citation § 71.49a Applications for operating permits and industrial...are not adequate to protect the revenue; He may issue a citation for the contemplated disapproval of the application....

2013-04-01

322

Pharmaceutical applications of shellac: moisture-protective and taste-masking coatings and extended-release matrix tablets.  

PubMed

Shellac is a natural polymer, which is used as enteric coating material in pharmaceutical applications. The major objective of the present study was to investigate the potential of shellac for other purposes, namely to provide moisture-protective and taste-masking coatings as well as extended-release matrix tablets. The efficiency of shellac to achieve moisture protection and taste masking was compared with that of hydroxypropyl methylcellulose (HPMC), which is most frequently used for these purposes. Shellac-coated tablets showed lower water uptake rates than HPMC-coated systems at the same coating level. The stability of acetylsalicylic acid was higher in tablets coated with shellac compared with HPMC-coated systems, irrespective of the storage humidity. Therefore, lower shellac coating levels were required to achieve the same degree of drug protection. Shellac coatings effectively masked the unpleasant taste of acetaminophen tablets. Compared to HPMC, again lower coating levels were required to achieve similar effects. The resulting drug release in simulated gastric fluid was not significantly altered by the thin shellac coatings, which rapidly ruptured due to the swelling of the coated tablet core. In addition, shellac was found to be a suitable matrix former for extended-release tablets. The latter could be prepared by direct compression or via wet granulation using ethanolic or ammoniated aqueous shellac binder solutions. The resulting drug-release patterns could effectively be altered by varying different formulation and processing parameters. PMID:14570313

Pearnchob, N; Siepmann, J; Bodmeier, R

2003-09-01

323

Application of axiomatic design and design structure matrix to the decomposition of engineering systems  

Microsoft Academic Search

A design decomposition-integration model, named COPE, is proposed in which Axiomatic Design Matrices (DM) map Functional Requirements to Design Parameters while Design Structure Matrices (DSM) provide structured representation of the system development context. In COPE, the DM and the DSM co-evolve. Traversing between the two types of matrices allows for some control in the application of the system knowledge which

M. D. Guenov; S. G. Barker

2005-01-01

324

Microwave VI transmission matrix formalism for the analysis of photonic circuits: application to fiber Bragg gratings  

Microsoft Academic Search

We propose the use of V-I matrices well known in microwave engineering to the analysis of photonic devices, especially those based on multilayer dielectrics. As an application we present a novel fast effective index method for the analysis of fiber Bragg gratings based on the use of V-I transmission matrices. It combines the exactitude of traditional effective index methods and

J. Capmany; M. A. Muriel; S. Sales; J. J. Rubio; D. Pastor

2003-01-01

325

Review article: Polymer-matrix Nanocomposites, Processing, Manufacturing, and Application: An Overview  

Microsoft Academic Search

This review is designed to be a comprehensive source for polymer nanocomposite research, including fundamental structure\\/property relationships, manufacturing techniques, and applications of polymer nanocomposite materials. In addition to presenting the scientific framework for the advances in polymer nanocomposite research, this review focuses on the scientific principles and mechanisms in relation to the methods of processing and manufacturing with a discussion

Farzana Hussain; Mehdi Hojjati; Masami Okamoto; Russell E. Gorga

2006-01-01

326

Knowledge communities in matrix-like organizations: managing knowledge towards application  

Microsoft Academic Search

Purpose – This paper aims to analyze how formal, horizontal knowledge communities contribute to knowledge application. In large, complex organizations employees face multiple roles that compete for their time and may be conflicting. The paper seeks to analyze the interplay between the communities, the line organization, and the employees; specifically, to examine how the quality of management of the communities,

Torstein Nesheim; Karen M. Olsen; Anita E. Tobiassen

2011-01-01

327

Development of ceramic matrix composites for application in the ceramic technology for advanced heat engines project  

SciTech Connect

The objective of this effort (Phase II of a multi-phase program) was to maximize the toughness of a high-temperature Si{sub 3}N{sub 4} (GN-10) by the near-net-shape fabrication technology established previously (Phase I). Acid-etched American Matrix SiC whiskers were selected as the reinforcement. Extensive green forming and densification process optimizations were conducted. The results showed that whisker addition increased the toughness slightly, but decreased the strength of the material. It has been recommended to discontinue the whisker reinforcement approach, and to instead pursue the in-situ grown-whisker reinforcement approach. To address future needs for the composite technology, two supplemental efforts were conducted using monolithic GN-10 Si{sub 3}N{sub 4}. These were nanometer deposition of sintering aids and ultrasonic characterization of drying. Spray drying, polymerization, basic precipitation, and evaporation yielded more uniform sintering aid distributions than conventional ball milling. Spray drying was selected for scale-up study. Improved mechanical properties were demonstrated. The results of the ultrasonic study showed that variations in ultrasonic compressional velocity in slip-cast components are more complex than anticipated. Specifically, it was found that the sonic velocity, as a function of moisture content, was double-valued. This behavior, together with the problems associated with maintaining uniform couplant, precludes the use of ultrasonics as a routine means of monitoring moisture content.

Yeh, H.; Solidum, E.; Karasek, K.; Stranford, G.; Yuhas, D.; Schienle, J.; Bradley, S. (Allied-Signal Aerospace Co., Torrance, CA (United States). Garrett Ceramic Components Div.)

1992-04-01

328

Two-dimensional {ital R}-matrix propagator: Application to electron-hydrogen scattering  

SciTech Connect

The two-dimensional {ital R}-matrix propagator of Le Dourneuf {ital et} {ital al}. [J. Phys. B {bold 23}, L559 (1990)] is generalized to arbitrary angular momenta and applied to the study of electron-hydrogen collisions at energies up to the {ital n}=5 threshold. Results are presented for phase shifts, resonance positions and widths, as well as cross sections for partial waves of total angular momenta {ital L}{le}3. The stability and efficiency of the method are established. A comparison is made below the {ital n}=3 threshold with results from other theories. Agreement is very good, in particular with the results of a finite-difference numerical integration of the Schr{umlt o}dinger equation by Wang and Callaway [Phys. Rev. A {bold 50}, 2327 (1994)]. Partial cross sections for {sup 1}{ital S} between the {ital n}=3 and 5 thresholds illustrate the potential of the method for studying excitation into high Rydberg states. {copyright} {ital 1996 The American Physical Society.}

Dunseath, K.M.; Le Dourneuf, M.; Terao-Dunseath, M.; Launay, J. [Laboratoire de Simulation des Interatctions entre Molecules, Photons et Atomes, EP 99 du CNRS, Batiment 22, Campus de Beaulieu, Universite de Rennes I, 35042 Rennes Cedex (France)

1996-07-01

329

Applications of random matrix theory in quantum Hall effect and stochastic growth processes  

NASA Astrophysics Data System (ADS)

When a fluid of negligible viscosity is inserted into another, much more viscous fluid, in a 2-D geometry (the Hele-Shaw cell), it forms a droplet whose boundary evolves forming complicated patterns by the fingering instability. Neglecting the effects of surface tension, the evolution of the interface is given by Laplacian growth, which is known to lead to singularities of the boundary in finite time. Understanding the structure and evolution of singular points of Laplacian growth is considered to be essential in developing an effective theory for diffusion-limited aggregation (DLA). In DLA, a fractal aggregate grows by accretion of 2-D random walkers incoming from infinity. Laplacian growth is the deterministic version of the stochastic growth problem of DLA. Laplacian growth is also related to the semi-classical approximation of a system of 2-D electrons in a strong magnetic field---the Quantum Hall droplet. Although having very different characteristic length scales, all of these systems can be described through the normal random matrix theory. This formulation of the theory introduces a natural regularization procedure, resolving the singular boundary points of Laplacian growth, and leading to the correct semi-classic expression of the electronic wave function near such points. These results can also be used to understand the properties of the fractal structures obtained in stochastic growth processes such as DLA.

Teodorescu, Razvan

330

The B-spline R-matrix method for atomic processes: application to atomic structure, electron collisions and photoionization  

NASA Astrophysics Data System (ADS)

The basic ideas of the B-spline R-matrix (BSR) approach are reviewed, and the use of the method is illustrated with a variety of applications to atomic structure, electron-atom collisions and photo-induced processes. Special emphasis is placed on complex, open-shell targets, for which the method has proven very successful in reproducing, for example, a wealth of near-threshold resonance structures. Recent extensions to a fully relativistic framework and intermediate energies have allowed for an accurate treatment of heavy targets as well as a fully nonperturbative scheme for electron-impact ionization. Finally, field-free BSR Hamiltonian and electric dipole matrices can be employed in the time-dependent treatment of intense short-pulse laser-atom interactions.

Zatsarinny, Oleg; Bartschat, Klaus

2013-06-01

331

Potential analytical applications of interfacing a GC to an FT-ICR MS: fingerprinting complex sample matrixes.  

PubMed

Details of interfacing a high-pressure gas chromatograph to the internal ion source of a Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS) are described. We present our preliminary results and potential analytical applications of GC/FT-ICR for analyzing complex biological and environmental sample matrixes, such as petroleum mixtures. Based on GC/FT-ICR data, rapid characterization of various automobile gasoline samples is possible. Comparison between acquired data from the GC/FT-ICR MS (in broadband mode) and a commercial GC quadrupole mass spectrometer (QMS) (over a wide mass range) indicates that sensitivity of the GC/FT-ICR MS is an order of magnitude lower. High mass resolution and mass measurement accuracy of FT-ICR MS can be utilized for unambiguous molecular formula identification of unknown analytes. PMID:12139051

Szulejko, J E; Solouki, T

2002-07-15

332

A new numerical algorithm to solve fractional differential equations based on operational matrix of generalized hat functions  

NASA Astrophysics Data System (ADS)

In this paper, we propose a new numerical algorithm for solving linear and non linear fractional differential equations based on our newly constructed integer order and fractional order generalized hat functions operational matrices of integration. The linear and nonlinear fractional order differential equations are transformed into a system of algebraic equations by these matrices and these algebraic equations are solved through known computational methods. Further some numerical examples are given to illustrate and establish the accuracy and reliability of the proposed algorithm. The results obtained, using the scheme presented here, are in full agreement with the analytical solutions and numerical results presented elsewhere.

Tripathi, Manoj P.; Baranwal, Vipul K.; Pandey, Ram K.; Singh, Om P.

2013-06-01

333

Forward operation of adenine nucleotide translocase during F0F1-ATPase reversal: critical role of matrix substrate-level phosphorylation  

PubMed Central

In pathological conditions, F0F1-ATPase hydrolyzes ATP in an attempt to maintain mitochondrial membrane potential. Using thermodynamic assumptions and computer modeling, we established that mitochondrial membrane potential can be more negative than the reversal potential of the adenine nucleotide translocase (ANT) but more positive than that of the F0F1-ATPase. Experiments on isolated mitochondria demonstrated that, when the electron transport chain is compromised, the F0F1-ATPase reverses, and the membrane potential is maintained as long as matrix substrate-level phosphorylation is functional, without a concomitant reversal of the ANT. Consistently, no cytosolic ATP consumption was observed using plasmalemmal KATP channels as cytosolic ATP biosensors in cultured neurons, in which their in situ mitochondria were compromised by respiratory chain inhibitors. This finding was further corroborated by quantitative measurements of mitochondrial membrane potential, oxygen consumption, and extracellular acidification rates, indicating nonreversal of ANT of compromised in situ neuronal and astrocytic mitochondria; and by bioluminescence ATP measurements in COS-7 cells transfected with cytosolic- or nuclear-targeted luciferases and treated with mitochondrial respiratory chain inhibitors in the presence of glycolytic plus mitochondrial vs. only mitochondrial substrates. Our findings imply the possibility of a rescue mechanism that is protecting against cytosolic/nuclear ATP depletion under pathological conditions involving impaired respiration. This mechanism comes into play when mitochondria respire on substrates that support matrix substrate-level phosphorylation.—Chinopoulos, C., Gerencser, A. A., Mandi, M., Mathe, K., Töröcsik, B., Doczi, J., Turiak, L., Kiss, G., Konràd, C., Vajda, S., Vereczki, V., Oh, R. J., Adam-Vizi, V. Forward operation of adenine nucleotide translocase during F0F1-ATPase reversal: critical role of matrix substrate-level phosphorylation.

Chinopoulos, Christos; Gerencser, Akos A.; Mandi, Miklos; Mathe, Katalin; Torocsik, Beata; Doczi, Judit; Turiak, Lilla; Kiss, Gergely; Konrad, Csaba; Vajda, Szilvia; Vereczki, Viktoria; Oh, Richard J.; Adam-Vizi, Vera

2010-01-01

334

Wrapper-based selection of genetic features in genome-wide association studies through fast matrix operations  

PubMed Central

Background Through the wealth of information contained within them, genome-wide association studies (GWAS) have the potential to provide researchers with a systematic means of associating genetic variants with a wide variety of disease phenotypes. Due to the limitations of approaches that have analyzed single variants one at a time, it has been proposed that the genetic basis of these disorders could be determined through detailed analysis of the genetic variants themselves and in conjunction with one another. The construction of models that account for these subsets of variants requires methodologies that generate predictions based on the total risk of a particular group of polymorphisms. However, due to the excessive number of variants, constructing these types of models has so far been computationally infeasible. Results We have implemented an algorithm, known as greedy RLS, that we use to perform the first known wrapper-based feature selection on the genome-wide level. The running time of greedy RLS grows linearly in the number of training examples, the number of features in the original data set, and the number of selected features. This speed is achieved through computational short-cuts based on matrix calculus. Since the memory consumption in present-day computers can form an even tighter bottleneck than running time, we also developed a space efficient variation of greedy RLS which trades running time for memory. These approaches are then compared to traditional wrapper-based feature selection implementations based on support vector machines (SVM) to reveal the relative speed-up and to assess the feasibility of the new algorithm. As a proof of concept, we apply greedy RLS to the Hypertension – UK National Blood Service WTCCC dataset and select the most predictive variants using 3-fold external cross-validation in less than 26 minutes on a high-end desktop. On this dataset, we also show that greedy RLS has a better classification performance on independent test data than a classifier trained using features selected by a statistical p-value-based filter, which is currently the most popular approach for constructing predictive models in GWAS. Conclusions Greedy RLS is the first known implementation of a machine learning based method with the capability to conduct a wrapper-based feature selection on an entire GWAS containing several thousand examples and over 400,000 variants. In our experiments, greedy RLS selected a highly predictive subset of genetic variants in a fraction of the time spent by wrapper-based selection methods used together with SVM classifiers. The proposed algorithms are freely available as part of the RLScore software library at http://users.utu.fi/aatapa/RLScore/.

2012-01-01

335

Some Applications of the Pruefer Transformation and its Extensions.  

National Technical Information Service (NTIS)

Applications of the modified Prufer transformation to the scalar Schrodinger operator eigenvalue problem were considered as well as extensions of this transformation to the matrix Schrodinger operator eigenvalue problem and Dirac operator eigenvalue probl...

I. Ulehla

1982-01-01

336

The procedure execution manager and its application to Advanced Photon Source operation  

SciTech Connect

The Procedure Execution Manager (PEM) combines a complete scripting environment for coding accelerator operation procedures with a manager application for executing and monitoring the procedures. PEM is based on Tcl/Tk, a supporting widget library, and the dp-tcl extension for distributed processing. The scripting environment provides support for distributed, parallel execution of procedures along with join and abort operations. Nesting of procedures is supported, permitting the same code to run as a top-level procedure under operator control or as a subroutine under control of another procedure. The manager application allows an operator to execute one or more procedures in automatic, semi-automatic, or manual modes. It also provides a standard way for operators to interact with procedures. A number of successful applications of PEM to accelerator operations have been made to date. These include start-up, shutdown, and other control of the positron accumulator ring (PAR), low-energy transport (LET) lines, and the booster rf systems. The PAR/LET procedures make nested use of PEM`s ability to run parallel procedures. There are also a number of procedures to guide and assist tune-up operations, to make accelerator physics measurements, and to diagnose equipment. Because of the success of the existing procedures, expanded use of PEM is planned.

Borland, M. [Argonne National Lab., IL (United States). Advanced Photon Source

1997-06-01

337

Energy evaluation of steam-water cycle operation with mathematical modelling application  

NASA Astrophysics Data System (ADS)

In recent years, we can observe the development of the thermal diagnosis and operating control systems based on measuring techniques and mathematical modelling of processes improvement. Evaluation of the actual operating state is insufficient to make an optimal operating decisions. Thus, information about the influence of the operating parameters' deviations from the reference state on indicators describing energy consumption of the process (for example specific heat consumption or specific energy consumption) is also necessary. The paper presents methods for generation the information about the influence of the steam-water cycle operating parameters on specific heat consumption in a turbine's cycle. A mathematical model of steam-water cycle for a CHP (Cogeneration - also Combined Heat and Power) unit is being worked out. Methods for calculation of operating deviations with the application of correction curves and a mathematical model are described. Exemplary calculation results are presented.

Rusinowski, Henryk; Szapajko, Grzegorz

2011-12-01

338

Self-affine polytopes. Applications to functional equations and matrix theory  

SciTech Connect

A special kind of functional equation with compression of the argument--the affine self-similarity equation--is studied. The earlier known one-dimensional self-similarity equations are generalized to the multidimensional case of functions of several variables. A criterion for the existence and uniqueness of an L{sub p}-solution is established. Description of such equations involves classification of finite-dimensional convex self-affine compact sets. In this work properties of such objects are thoroughly analysed; in particular, a counterexample to the well-known conjecture about the structure of such bodies, which was put forward in 1991, is given. Applications of the results obtained include some facts about the convergence of products of stochastic matrices; also, criteria for the convergence of some subdivision algorithms are suggested. Bibliography: 39 titles.

Voynov, Andrey S [M. V. Lomonosov Moscow State University, Faculty of Mechanics and Mathematics, Moscow (Russian Federation)

2011-10-31

339

Matrix diagonalization algorithm and its applicability to the nuclear shell model  

SciTech Connect

An importance-sampling iterative algorithm for diagonalizing shell model Hamiltonian matrices is reviewed and implemented in a spin uncoupled basis. Shell model spaces of dimensions up to N < or approx.10{sup 9} are considered. The analysis shows that about 10% of the basis states are enough to bring the eigenvalues to convergence. This fraction of states, however, is insufficient to lead to convergence of the transition strengths, thereby limiting the applicability of the method to not too large spaces. In its domain of validity, the method yields a large number of eigensolutions and can be usefully adopted for rather complete studies of low-energy spectroscopy. This is done here for {sup 132,134}Xe isotopes. The calculation yields spectra and electromagnetic responses in fairly good agreement with the available experimental data and unveils the properties of the low-energy states of these isotopes, including their proton-neutron symmetry.

Bianco, D.; Andreozzi, F.; Lo Iudice, N.; Porrino, A.; Knapp, F. [Dipartimento di Scienze Fisiche, Universita di Napoli Federico II and Istituto Nazionale di Fisica Nucleare, Monte S. Angelo, via Cintia, I-80126 Napoli (Italy)

2011-08-15

340

A New CCM (Carbon Composite Matrix) Material with Improved Shielding Effectiveness for X-Band Application  

NASA Astrophysics Data System (ADS)

In this letter, a new CCM material, adding Ni powder to a conventional CCM, for X-band applications is designed and analyzed to improve the SE. To obtain the SE of the fabricated CCM accurately, material constants of the CCM of the permittivity and permeability were extracted using transmission/reflection measurements. Using the material constants derived from the measurement, the SE was calculated and the results were verified using a commercial full-wave three-dimensional electromagnetic wave simulator. The SE of the proposed the CCM was improved by approximately 4dB in the X band compared to that of a conventional CCM. The CCM proposed in this paper can be applied as a shielding material as well as for housing of various communication systems and electrical instruments.

Chung, Yeong-Chul; Lee, Kyung-Won; Hong, Ic-Pyo; Oh, Kyung-Hyun; Yook, Jong-Gwan

341

Hankel Operators of Class \\mathfrak{S}_p and Their Applications (rational Approximation, Gaussian Processes, the Problem of Majorizing Operators)  

NASA Astrophysics Data System (ADS)

A criterion is given for a Hankel operator H_{\\varphi} \\colon H^2 \\to H_-^2 (H_{\\varphi} f = (I - \\mathbf{P})\\varphi f, where \\mathbf{P} is the orthogonal projection of L^2 onto H^2) to belong to the Schatten-von Neumann class \\mathfrak{S}_p in terms of its symbol \\varphi. Various applications are considered: a precise description is obtained for classes of functions definable in terms of rational approximation in the BMO (bounded mean oscillation) norm; it is proved that the averaging projection onto the set of Hankel operators is bounded in the norm of \\mathfrak{S}_p, 1 < p < +\\infty; a counterexample is given to a conjecture of Simon on the majorization property in \\mathfrak{S}_p; a problem of Ibragimov and Solev on stationary Gaussian processes is solved; and a criterion is obtained for functions of an operator in the Sz.-Nagy-Foia? model to belong to the class \\mathfrak{S}_p.Bibliography: 47 titles.

Peller, V. V.

1982-04-01

342

Variable speed operation of generators with rotor-speed feedback in wind power applications  

SciTech Connect

The use of induction generators in wind power applications has been common since the early development of the wind industry. Most of these generators operate at fixed frequency and are connected directly to the utility grid. Unfortunately, this mode of operation limits the rotor speed to a specific rpm. Variable speed operation is preferred in order to facilitate maximum energy capture over a wide range of wind speeds. This paper explores variable speed operating strategies for wind turbine applications. The objectives are to maximize energy production, provide controlled start-up, and reduce torque loading. This paper focuses on optimizing the energy captured by operating at maximum aerodynamic efficiency at any wind speed. The control strategy the authors analyze uses rotor speed and generator power as the feedback signals. In the normal operating region, rotor speed is used to compute a target power that corresponds to optimum operation. With power as the control objective, the power converter and generator are controlled to track the target power at any rpm. Thus, the torque-speed characteristic of the generator is shaped to optimize the energy capture. The target power is continuously updated at any rpm. In extreme areas of the operating envelope, during start-up, shutdown, generator overload, or overspeed, different strategies driven by other system considerations must be used.

Muljadi, E.; Butterfield, C.P.; Migliore, P. [National Renewable Energy Lab., Golden, CO (United States)

1996-11-01

343

Variable speed operation of generators with rotor-speed feedback in wind power applications  

SciTech Connect

The use of induction generators in wind power applications has been common since the early development of the wind industry. Most of these generators operate at fixed frequency and are connected directly to the utility grid. Unfortunately, this mode of operation limits the rotor speed to a specific rpm. Variable-speed operation is preferred in order to facilitate maximum energy capture over a wide range of wind speeds. This paper explores variable-speed operating strategies for wind turbine applications. The objectives are to maximize energy production, provide controlled start-up and reduce torque loading. This paper focuses on optimizing the energy captured by operating at maximum aerodynamic efficiency at any wind speed. The control strategy we analyze uses rotor speed and generator power as the feedback signals. In the normal operating region, rotor speed is used to compute a target power that corresponds to optimum operation. With power as the control objective, the power converter and generator are controlled to track the target power at any rpm. Thus, the torque-speed characteristic of the generator is shaped to optimize the energy capture. The target power is continuously updated at any rpm. in extreme areas of the operating envelope, during start-up, shutdown, generator overload, or overspeed, different strategies driven by other system considerations must be used.

Muljadi, E.; Butterfield, C.P.; Migliore, P.

1995-11-01

344

Polynomial supersymmetry for matrix Hamiltonians  

NASA Astrophysics Data System (ADS)

We study intertwining relations for matrix non-Hermitian Hamiltonians by matrix differential operators of arbitrary order. It is established that for any intertwining operator of minimal order there is operator that intertwines the same Hamiltonians in the opposite direction and such that the products of these operators are identical polynomials of the corresponding Hamiltonians. The related polynomial algebra of supersymmetry is constructed. The problems of minimization and reducibility of a matrix intertwining operator are considered and the criteria of minimizability and reducibility are presented. It is shown that there are absolutely irreducible matrix intertwining operators, in contrast to the scalar case.

Sokolov, A. V.

2013-03-01

345

Fisher information matrix for branching processes with application to electron-multiplying charge-coupled devices  

PubMed Central

The high quantum efficiency of the charge-coupled device (CCD) has rendered it the imaging technology of choice in diverse applications. However, under extremely low light conditions where few photons are detected from the imaged object, the CCD becomes unsuitable as its readout noise can easily overwhelm the weak signal. An intended solution to this problem is the electron-multiplying charge-coupled device (EMCCD), which stochastically amplifies the acquired signal to drown out the readout noise. Here, we develop the theory for calculating the Fisher information content of the amplified signal, which is modeled as the output of a branching process. Specifically, Fisher information expressions are obtained for a general and a geometric model of amplification, as well as for two approximations of the amplified signal. All expressions pertain to the important scenario of a Poisson-distributed initial signal, which is characteristic of physical processes such as photon detection. To facilitate the investigation of different data models, a “noise coefficient” is introduced which allows the analysis and comparison of Fisher information via a scalar quantity. We apply our results to the problem of estimating the location of a point source from its image, as observed through an optical microscope and detected by an EMCCD.

Chao, Jerry; Ward, E. Sally; Ober, Raimund J.

2012-01-01

346

Infrared and millimeter-wave sensors for military special operations and law enforcement applications  

Microsoft Academic Search

We consider the application of infrared and millimeter-wave sensors, developed for the most part during the Cold War, to the solution of problems encountered by military special operations units and law enforcement personnel. These problems include detection of weapons concealed beneath clothing, through-the-wall surveillance, and wide-area surveillance under poor lighting conditions. Key sensors used in these applications are infrared cameras,

N. C. Currie; F. J. Demma; D. D. Ferris; B. R. Kwasowsky; R. W. McMillan; M. C. Wicks

1996-01-01

347

Monte Carlo applications for the design and operation of nuclear facilities  

SciTech Connect

The computational capabilities of current supercomputers enable the application of rigorous Monte Carlo methods to solve day-to-day neutronics and shielding problems. Experience at Westinghouse Hanford Company has included applications to: reactor operations, decommissioning of a reactor facility, and the design of a space reactor; intermediate energy accelerators; and high-level waste facilities and casks. These practical applications are typically computationally intensive because of the amount of information required. A number of practical examples are discussed. An increase in effective computer capabilities would further enhance the use of Monte Carlo methods. 16 refs., 4 figs., 2 tabs.

Carter, L.L.; Bunch, W.L.; Morford, R.J.; Wootan, D.W.; Schwarz, R.A.

1988-06-01

348

Nanocrystal doped matrixes  

DOEpatents

Matrixes doped with semiconductor nanocrystals are provided. In certain embodiments, the semiconductor nanocrystals have a size and composition such that they absorb or emit light at particular wavelengths. The nanocrystals can comprise ligands that allow for mixing with various matrix materials, including polymers, such that a minimal portion of light is scattered by the matrixes. The matrixes of the present invention can also be utilized in refractive index matching applications. In other embodiments, semiconductor nanocrystals are embedded within matrixes to form a nanocrystal density gradient, thereby creating an effective refractive index gradient. The matrixes of the present invention can also be used as filters and antireflective coatings on optical devices and as down-converting layers. Processes for producing matrixes comprising semiconductor nanocrystals are also provided. Nanostructures having high quantum efficiency, small size, and/or a narrow size distribution are also described, as are methods of producing indium phosphide nanostructures and core-shell nanostructures with Group II-VI shells.

Parce, J. Wallace (Palo Alto, CA); Bernatis, Paul (Sunnyvale, CA); Dubrow, Robert (San Carlos, CA); Freeman, William P. (San Mateo, CA); Gamoras, Joel (Vallejo, CA); Kan, Shihai (San Jose, CA); Meisel, Andreas (Redwood City, CA); Qian, Baixin (Sunnyvale, CA); Whiteford, Jeffery A. (Belmont, CA); Ziebarth, Jonathan (Palo Alto, CA)

2010-01-12

349

Principles and practical application of the receiver-operating characteristic analysis for diagnostic tests  

Microsoft Academic Search

We review the principles and practical application of receiver-operating characteristic (ROC) analysis for diagnostic tests. ROC analysis can be used for diagnostic tests with outcomes measured on ordinal, interval or ratio scales. The dependence of the diagnostic sensitivity and specificity on the selected cut-off value must be considered for a full test evaluation and for test comparison. All possible combinations

M. Greiner; D. Pfeiffer; R. D. Smith

2000-01-01

350

Variable speed operation of generators with rotor-speed feedback in wind power applications.  

National Technical Information Service (NTIS)

The use of induction generators in wind power applications has been common since the early development of the wind industry. Most of these generators operate at fixed frequency and are connected directly to the utility grid. Unfortunately, this mode of op...

E. Muljadi C. P. Butterfield P. Migliore

1995-01-01

351

Linear Recurrences with Polynomial Coefficients and Application to Integer Factorization and Cartier-Manin Operator  

Microsoft Academic Search

We study the complexity of computing one or several terms (not necessarily consec- utive) in a recurrence with polynomial coefficients. As applications, we improve the best currently known upper bounds for factoring integers deterministically and for computing the Cartier-Manin operator of hyperelliptic curves.

Alin Bostan; Pierrick Gaudry; Éric Schost

2007-01-01

352

14 CFR 135.4 - Applicability of rules for eligible on-demand operations.  

Code of Federal Regulations, 2013 CFR

...TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...GOVERNING PERSONS ON BOARD SUCH AIRCRAFT General § 135.4 Applicability...fixed-wing and powered-lift aircraft, the following FAA certification...ratings. (iii) For all other aircraft, the following FAA...

2013-01-01

353

78 FR 16302 - Crystal River Unit 3 Nuclear Generating Plant, Application for Amendment to Facility Operating...  

Federal Register 2010, 2011, 2012, 2013

...REGULATORY COMMISSION [Docket No. 50-302; NRC-2011-0301] Crystal River Unit 3 Nuclear Generating Plant, Application for Amendment...amendment to Facility Operating License No. DPR-72 for the Crystal River Unit 3 Nuclear Generating Plant (CR-3),...

2013-03-14

354

The Application of Operant Principles to Mentally Retarded Children. (RIEEC Research Bulletin 1).  

ERIC Educational Resources Information Center

|Presented are six case studies demonstrating the application of operant conditioning principles to teaching self-care skills and modifying deviant behavior in six moderately to profoundly retarded children 5- to 15-years-old in Japan. Included in the case histories, such as that of a moderately retarded 12-year-old who was toilet trained, are…

Yamaguchi, Kaoru

355

Black Fox Station, Units 1 and 2. Application for Construction Permits and Operating Licenses.  

National Technical Information Service (NTIS)

An application to construct and operate Black Fox Station, Units 1 and 2, is presented. The two BWR type reactors will have a rated core thermal power of 3579 MW(t) and a net electrical power of approximately 1150 MW(e). The facility will be located in In...

1975-01-01

356

Receiver operating characteristic (ROC) analysis: Basic principles and applications in radiology  

Microsoft Academic Search

Receiver operating characteristic (ROC) analysis is a widely accepted method for analyzing and comparing the diagnostic accuracy of radiological tests. In this paper we will explain the basic principles underlying ROC analysis and provide practical information on the use and interpretation of ROC curves. The major applications of ROC analysis will be discussed and their limitations will be addressed.

Arian R van Erkel; Peter M. Th Pattynama

1998-01-01

357

Mission computer replacement prototype for Special Operations Forces aircraft: an application of commercial technology to avionics  

Microsoft Academic Search

Attempts to improve the reliability and maintainability of Special Operations Forces (SOF) fixed wing aircraft avionics by developing the mission computer replacement prototype (MCRP), are described. The purpose of the MCRP is to design, build, and demonstrate a replacement mission computer that is applicable across SOF aircraft. Our goal is to develop an open architecture mission computer based on industry

H. Lowery; B. Mitchell

2000-01-01

358

78 FR 7818 - Duane Arnold Energy Center; Application for Amendment to Facility Operating License  

Federal Register 2010, 2011, 2012, 2013

...NRC-2013-0022] Duane Arnold Energy Center; Application for Amendment...granted the request of NextEra Energy Duane Arnold, LLC (the licensee...for proposed amendment to Renewed Facility Operating License No. DPR-49 for the Duane Arnold Energy Center, located in...

2013-02-04

359

Session: Development and application of guidelines for siting, constructing, operating and monitoring wind turbines  

Microsoft Academic Search

This session at the Wind Energy and Birds\\/Bats workshop consisted of two presentations followed by a discussion\\/question and answer period. The two papers were: 'Development and Application of USFWS Guidance for Site Evaluation, Siting, Construction, Operation and Monitoring of Wind Turbines' by Albert Manville and 'Wind Power in Washington State' by Greg Hueckel. The session provided a comparison of wind

Albert Manville; Greg Hueckel

2004-01-01

360

SAI (SYSTEMS APPLICATIONS, INCORPORATED) AIRSHED MODEL OPERATIONS MANUALS. VOLUME 1. USER'S MANUAL  

EPA Science Inventory

This report presents a general view of the Systems Applications, Inc. (SAI) Airshed Model as well as detailed operating instructions for the user. Included are discussions of all the files needed to run the model, the data preparation programs that produce each file, the input fo...

361

Application of active telecommunication network to intelligent data processing for power system operation  

Microsoft Academic Search

An active telecommunication network plays an important role in achieving intelligent data processing for the next generation power system operation, which facilitates the collection of accurate power system status and the transfer of proper signals and commands based on active routers. Active routers enable new applications and services that leverage network-based computation and storage to fully enhance traditional network functions.

Duo Li; Yoshizumi Serizawa; Mai Kiuchi

2002-01-01

362

Plasticity associated with escalated operant ethanol self-administration during acute withdrawal in ethanol-dependent rats requires intact matrix metalloproteinase systems  

PubMed Central

Repeated cycles of ethanol intoxication and withdrawal associated with dependence induce neuroadaptations in a variety of brain systems. Withdrawal-induced negative emotional states can be ameliorated by ethanol consumption; a learned process termed negative reinforcement. Accordingly, a dependence-induced phenotype is escalated ethanol self-administration. Matrix metalloproteinases (MMPs) are proteolytic enzymes which degrade the extracellular matrix to allow for synaptic reorganization and plasticity. To test the hypothesis that an intact MMP system is required for animals to learn about the negative reinforcing effects of ethanol and display escalated self-administration during acute withdrawal when ethanol-dependent, male Wistar rats were trained to self-administer ethanol and then assigned to either acute or chronic MMP inhibition treatment groups. The chronic treatment group received intracerebroventricular (ICV) infusions of the broad spectrum MMP inhibitor FN-439 or artificial cerebrospinal fluid (aCSF) via osmotic minipumps during a one month ethanol dependence induction period and subsequent post-dependence induction self-administration sessions that occurred during acute withdrawal. The acute treatment group only received ICV FN-439 or aCSF on the day of self-administration sessions following dependence induction during acute withdrawal. The results showed that inhibition of MMPs attenuated escalated ethanol self-administration following chronic and acute exposure conditions. Furthermore, once learning (i.e., plasticity) had occurred, MMP inhibition had no impact on escalated response patterns and animals previously subjected to MMP inhibition that did not escalate evidenced normal escalations in operant ethanol self-administration once FN-439 treatments were terminated. Thus, the present data identified that an intact MMP system is required for the escalated responding that occurs during acute withdrawal in dependent animals and implicate such escalation as a learned response.

Smith, Alexander W.; Nealey, Kathryn A.; Wright, John W.; Walker, Brendan M.

2011-01-01

363

A Framework for Regularized Non-Negative Matrix Factorization, with Application to the Analysis of Gene Expression Data  

PubMed Central

Non-negative matrix factorization (NMF) condenses high-dimensional data into lower-dimensional models subject to the requirement that data can only be added, never subtracted. However, the NMF problem does not have a unique solution, creating a need for additional constraints (regularization constraints) to promote informative solutions. Regularized NMF problems are more complicated than conventional NMF problems, creating a need for computational methods that incorporate the extra constraints in a reliable way. We developed novel methods for regularized NMF based on block-coordinate descent with proximal point modification and a fast optimization procedure over the alpha simplex. Our framework has important advantages in that it (a) accommodates for a wide range of regularization terms, including sparsity-inducing terms like the penalty, (b) guarantees that the solutions satisfy necessary conditions for optimality, ensuring that the results have well-defined numerical meaning, (c) allows the scale of the solution to be controlled exactly, and (d) is computationally efficient. We illustrate the use of our approach on in the context of gene expression microarray data analysis. The improvements described remedy key limitations of previous proposals, strengthen the theoretical basis of regularized NMF, and facilitate the use of regularized NMF in applications.

Taslaman, Leo; Nilsson, Bjorn

2012-01-01

364

[Application of excitation-emission matrix spectrum combined with parallel factor analysis in dissolved organic matter in East China Sea].  

PubMed

Using excitation-emission matrix spectrum(EEMs) combined with parallel factor analysis (PARAFAC) examine the fluorescent components feature of dissolved organic matter (DOM) sampled from East China Sea in the summer and autumn was examined. The type, distribution and origin of the fluorescence dissolved organic matter were also discussed. Three fluorescent components were identified by PARAFAC, including protein-like component C1 (235, 280/330), terrestrial or marine humic-like component C2 (255, 330/400) and terrestrial humic-like component C3 (275, 360/480). The good linearity of the two humic-like components showed the same source or some relationship between the chemical constitutions. As a whole, the level of the fluorescence intensity in coastal ocean was higher than that of the open ocean in different water layers in two seasons. The relationship of three components with chlorophyll-a and salinity showed the DOM in the study area is almost not influenced by the living algal matter, but the fresh water outflow of the Yangtze River might be the source of them in the Yangtze River estuary in Summer. From what has been discussed above, we can draw the conclusion that the application of EEM-PARAFAC modeling will exert a profound influence upon the research of the dissolved organic matter. PMID:23705426

Lü, Li-Sha; Zhao, Wei-Hong; Miao, Hui

2013-03-01

365

Photosensized Controlling Benzyl Methacrylate-Based Matrix Enhanced Eu3+ Narrow-Band Emission for Fluorescence Applications  

PubMed Central

This study synthesized a europium (Eu3+) complex Eu(DBM)3Cl-MIP (DBM = dibenzoyl methane; Cl-MIP = 2-(2-chlorophenyl)-1-methyl-1H-imidazo[4,5-f][1,10]phenanthroline) dispersed in a benzyl methacrylate (BMA) monomer and treated with ultraviolet (UV) light for polymerization. Spectral results showed that the europium complex containing an antenna, Cl-MIP, which had higher triplet energy into the Eu3+ energy level, was an energetically enhanced europium emission. Typical stacking behaviors of ?–? interactions between the ligands and the Eu3+-ion were analyzed using single crystal X-ray diffraction. Regarding the luminescence performance of this europium composite, the ligand/defect emission was suppressed by dispersion in a poly-BMA (PBMA) matrix. The underlying mechanism of the effective enhancement of the pure Eu3+ emission was attributed to the combined effects of structural modifications, defect emissions, and carrier charge transfer. Fluorescence spectra were compared to the composite of optimized Eu3+ emission where they were subsequently chelated to four metal ions via carboxylate groups on the BMA unit. The optical enhanced europium composite clearly demonstrated highly efficient optical responses and is, therefore a promising application as an optical detection material.

Lee, Jiann-Fong; Chen, Hsuen-Li; Lee, Geneh-Siang; Tseng, Shao-Chin; Lin, Mei-Hsiang; Liau, Wen-Bin

2012-01-01

366

The cysteine switch: a principle of regulation of metalloproteinase activity with potential applicability to the entire matrix metalloproteinase gene family.  

PubMed

The general applicability of the "cysteine-switch" activation mechanism to the members of the matrix metalloproteinase (MMP) gene family is examined here. All currently known members of the MMP gene family share the characteristic that they are synthesized in a latent, inactive, form. Recent evidence suggests that this latency in human fibroblast collagenase (HFC) is the result of formation of an intramolecular complex between the single cysteine residue in its propeptide domain and the essential zinc atom in the catalytic domain, a complex that blocks the active site. Latent HFC can be activated by multiple means, all of which effect the dissociation of the cysteine residue from the complex. This is referred to as the "cysteine-switch" mechanism of activation. The propeptide domain that contains the critical cysteine residue and the catalytic domain that contains the zinc-binding site are the only two domains common to all of the MMPs. The amino acid sequences surrounding both the critical cysteine residue and a region of the protein chains containing two of the putative histidine zinc-binding ligands are highly conserved in all of the MMPs. A survey of the literature shows that many of the individual MMPs can be activated by the multiple means observed for latent HFC. These observations support the view that the cysteine-switch mechanism is applicable to all members of this gene family. This mechanism is unprecedented in enzymology as far as we know and offers the opportunity for multiple modes of physiological activation of these important enzymes. Since conditions in different cells and tissues may match those necessary to effect one of these activation modes for a given MMP, this may offer metabolic flexibility in the control of MMP activation. PMID:2164689

Van Wart, H E; Birkedal-Hansen, H

1990-07-01

367

30 CFR 947.780 - Surface mining permit application-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...application-minimum requirements for reclamation and operation plan. 947.780 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationâminimum requirements for reclamation and operation plan. (a) Part...

2013-07-01

368

30 CFR 941.780 - Surface mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-minimum requirements for reclamation and operation plan. 941.780 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâminimum requirements for reclamation and operation plan. (a) Part...

2013-07-01

369

30 CFR 937.780 - Surface mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-minimum requirements for reclamation and operation plan. 937.780 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâminimum requirements for reclamation and operation plan. (a) Part...

2013-07-01

370

30 CFR 903.784 - Underground mining permit applications-Minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-Minimum requirements for reclamation and operation plan. 903.784 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâMinimum requirements for reclamation and operation plan. Part 784 of...

2013-07-01

371

30 CFR 910.780 - Surface mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-minimum requirements for reclamation and operation plan. 910.780 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâminimum requirements for reclamation and operation plan. (a) Part...

2013-07-01

372

30 CFR 905.780 - Surface mining permit applications-Minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-Minimum requirements for reclamation and operation plan. 905.780 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâMinimum requirements for reclamation and operation plan. Part 780 of...

2013-07-01

373

30 CFR 933.780 - Surface mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-minimum requirements for reclamation and operation plan. 933.780 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâminimum requirements for reclamation and operation plan. Part 780 of...

2013-07-01

374

30 CFR 912.780 - Surface mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-minimum requirements for reclamation and operation plan. 912.780 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâminimum requirements for reclamation and operation plan. Part 780 of...

2013-07-01

375

30 CFR 905.784 - Underground mining permit applications-Minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-Minimum requirements for reclamation and operation plan. 905.784 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâMinimum requirements for reclamation and operation plan. Part 784 of...

2013-07-01

376

30 CFR 922.780 - Surface mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-minimum requirements for reclamation and operation plan. 922.780 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâminimum requirements for reclamation and operation plan. Part 780 of...

2013-07-01

377

30 CFR 912.784 - Underground mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-minimum requirements for reclamation and operation plan. 912.784 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâminimum requirements for reclamation and operation plan. Part 784 of...

2013-07-01

378

30 CFR 939.780 - Surface mining permit applications-minimum requirements for reclamation and operations plan.  

Code of Federal Regulations, 2013 CFR

...applications-minimum requirements for reclamation and operations plan. 939.780 ...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâminimum requirements for reclamation and operations plan. (a) Part...

2013-07-01

379

30 CFR 922.784 - Underground mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-minimum requirements for reclamation and operation plan. 922.784 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâminimum requirements for reclamation and operation plan. Part 784 of...

2013-07-01

380

30 CFR 942.780 - Surface mining permit applications-Minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-Minimum requirements for reclamation and operation plan. 942.780 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâMinimum requirements for reclamation and operation plan. Part 780 of...

2013-07-01

381

30 CFR 903.780 - Surface mining permit applications-Minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-Minimum requirements for reclamation and operation plan. 903.780 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâMinimum requirements for reclamation and operation plan. Part 780 of...

2013-07-01

382

30 CFR 921.784 - Underground mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-minimum requirements for reclamation and operation plan. 921.784 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâminimum requirements for reclamation and operation plan. Part 784 of...

2013-07-01

383

30 CFR 921.780 - Surface mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-minimum requirements for reclamation and operation plan. 921.780 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâminimum requirements for reclamation and operation plan. Part 780 of...

2013-07-01

384

30 CFR 933.784 - Underground mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...applications-minimum requirements for reclamation and operation plan. 933.784 Section...Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE...applicationsâminimum requirements for reclamation and operation plan. Part 784 of...

2013-07-01

385

The Characterisation of the Collagenolytic Activity of Cardosin A Demonstrates its Potential Application for Extracellular Matrix Degradative Processes  

Microsoft Academic Search

Type I collagen is the major fibrous protein of mammals being needed to strengthen and organise the extracellular matrix (ECM). Connective tissue components are modulated by matrix metalloproteinases, which are critical for disintegration and remodelling of ECM under physiological and pathological conditions. Cardosin A is an abundant aspartic proteinase (AP) from Cynara cardunculus L. that has been shown to be

Ana S. Duarte; Anabela O. Pereira; Antonio M. S. Cabrita; Arthur J. G. Moir; Euclides M. V. Pires; Marlene M. T. Barros

2005-01-01

386

30 CFR 947.784 - Underground mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

...784 Underground mining permit applications...chapter, Underground Mining Permit Applications...conduct underground coal mining operations. ...compliance with local Air Pollution Control Authorities...with the Washington Water Pollution...

2013-07-01

387

In situ applications of a new diver-operated motorized microsensor profiler.  

PubMed

Microsensors are powerful tools for microenvironment studies, however their use has often been restricted to laboratory applications due to the lack of adequate equipment for in situ deployments. Here we report on new features, construction details, and examples of applications of an improved diver-operated motorized microsensor profiler for underwater field operation to a water depth of 25 m. The new motorized profiler has a final precision of 5 microm, and can accommodate amperometric Clark-type microsensors for oxygen and hydrogen sulfide, potentiometric microsensors (e.g., for pH, Ca2+), and fiber-optic irradiance microsensors. The profiler is interfaced by a logger with a signal display, and has pushbuttons for underwater operation. The system can be pre-programmed to autonomous operation or interactively operated by divers. Internal batteries supply power for up to 24 h of measurements and 36 h of data storage (max. 64 million data points). Two flexible stands were developed for deployment on uneven or fragile surfaces, such as coral reefs. Three experimental pilot studies are presented, where (1) the oxygen distribution in a sand ripple was 3-D-mapped, (2) the microenvironment of sediment accumulated on a stony coral was studied, and (3) oxygen dynamics during an experimental sedimentation were investigated. This system allows SCUBA divers to perform a wide array of in situ measurements, with deployment precision and duration similar to those possible in the laboratory. PMID:17937304

Weber, Miriam; Faerber, Paul; Meyer, Volker; Lott, Christian; Eickert, Gabriele; Fabricius, Katharina E; De Beer, Dirk

2007-09-01

388

Hybrid matrix amplifier  

DOEpatents

The present invention comprises a novel matrix amplifier. The matrix amplifier includes an active superconducting power divider (ASPD) having N output ports; N distributed amplifiers each operatively connected to one of the N output ports of the ASPD; and a power combiner having N input ports each operatively connected to one of the N distributed amplifiers. The distributed amplifier can included M stages of amplification by cascading superconducting active devices. The power combiner can include N active elements. The resulting (N[times]M) matrix amplifier can produce signals of high output power, large bandwidth, and low noise. 6 figures.

Martens, J.S.; Hietala, V.M.; Plut, T.A.

1995-01-03

389

Hybrid matrix amplifier  

DOEpatents

The present invention comprises a novel matrix amplifier. The matrix amplifier includes an active superconducting power divider (ASPD) having N output ports; N distributed amplifiers each operatively connected to one of the N output ports of the ASPD; and a power combiner having N input ports each operatively connected to one of the N distributed amplifiers. The distributed amplifier can included M stages of amplification by cascading superconducting active devices. The power combiner can include N active elements. The resulting (N.times.M) matrix amplifier can produce signals of high output power, large bandwidth, and low noise.

Martens, Jon S. (Sunnyvale, CA); Hietala, Vincent M. (Placitas, NM); Plut, Thomas A. (Albuquerque, NM)

1995-01-01

390

Solar photovoltaic applications seminar: design, installation and operation of small, stand-alone photovoltaic power systems  

SciTech Connect

This seminar material was developed primarily to provide solar photovoltaic (PV) applied engineering technology to the Federal community. An introduction to photoconductivity, semiconductors, and solar photovoltaic cells is included along with a demonstration of specific applications and application identification. The seminar details general systems design and incorporates most known information from industry, academia, and Government concerning small solar cell power system design engineering, presented in a practical and applied manner. Solar PV power system applications involve classical direct electrical energy conversion and electric power system analysis and synthesis. Presentations and examples involve a variety of disciplines including structural analysis, electric power and load analysis, reliability, sizing and optimization; and, installation, operation and maintenance. Four specific system designs are demonstrated: water pumping, domestic uses, navigational and aircraft aids, and telecommunications. All of the applications discussed are for small power requirement (under 2 kilowatts), stand-alone systems to be used in remote locations. Also presented are practical lessons gained from currently installed and operating systems, problems at sites and their resolution, a logical progression through each major phase of system acquisition, as well as thorough design reviews for each application.

Not Available

1980-07-01

391

Solar thermal system for lunar ISRU applications: development and field operation at Mauna Kea, HI  

NASA Astrophysics Data System (ADS)

This paper discusses the development, deployment and operation of the optical waveguide (OW) solar thermal power system for In-Situ Resource Utilization (ISRU) applications at the NASA ISRU analog test site on Mauna Kea, HI. In this solar thermal system, solar radiation is collected by the concentrator array which transfers the concentrated solar radiation to the OW transmission line made of low loss optical fibers. The OW transmission line directs the solar radiation to the place of utilization of the solar energy. In this paper applications of solar energy to sintering of native soil for surface stabilization and thermo-chemical processing of native soil for oxygen production are discussed.

Nakamura, Takashi; Smith, Benjamin K.

2011-09-01

392

Achieving a log(n) Speed Up for Boolean Matrix Operations and Calculating the Complexity of the Dense Linear Algebra step of Algebraic Stream Cipher Attacks and of Integer Factorization Methods  

Microsoft Academic Search

The purpose of this paper is to calculate the running time of dense boolean matrix operations, as used in stream cipher cryptanalysis and integer factorization. Several variations of Gaussian Elimination, Strassen's Algorithm and the Method of Four Russians are analyzed. In particular, we demonstrate that Strassen's Algorithm is actually slower than the Four Russians algorithm for matrices of the sizes

Gregory V. Bard

393

Regulating manure application discharges from concentrated animal feeding operations in the United States.  

PubMed

In the United States, reducing pollution from agriculture has received attention due to data suggesting that this is the leading source of impairment of many waterbodies. The federal government revised its regulations governing concentrated animal feeding operations (CAFOs) to enhance governmental oversight over sources of pollution. For the application of manure resulting in pollutant discharges, CAFOs need to implement nutrient management plans. A federal court affirmed the ability of the US federal government to oversee the application of manure from CAFOs that have discharges. Simultaneously, owners and operators of CAFOs who have implemented an appropriate nutrient management plan may forgo securing a permit if their discharges qualify under the agricultural stormwater discharge exemption. PMID:16271814

Centner, Terence J; Feitshans, Theodore A

2005-11-03

394

High-Performance Low Operation Power Transistor for 45nm Node Universal Applications  

Microsoft Academic Search

High-performance low operation power (LOP) transistors were developed for 45nm node universal applications. A high uniaxial strain and low resistance NiSi technique, enhanced by a slit under the slim and high Young's modulus (YM) offset spacer covered with dual stress liner (DSL), were used for electron and hole mobility enhancement and parasitic resistance (Rsd) reduction. The junction profile was also

M. Shima; K. Okabe; A. Yamaguchi; T. Sakoda; K. Kawamura; S. Pidin; M. Okuno; T. Owada; K. Sugimoto; J. Ogura; H. Kokura; H. Morioka; T. Watanabe; T. Isome; K. Okoshi; T. Mori; Y. Hayami; H. Minakata; A. Hatada; Y. Shimamune; A. Katakami; H. Ota; T. Sakuma; T. Miyashita; K. Hosaka; H. Fukutome; N. Tamura; T. Aoyama; K. Sukegawa; M. Nakaishi; S. Fukuyama; S. Nakai; M. Kojima; S. Sato; M. Miyajima; K. Hashimoto; T. Sugii

2006-01-01

395

Operation and application of a laser mass analyser (LASMA) for multielement analysis  

Microsoft Academic Search

The design and the operation of the LASMA instrument combining laser ablation with time-of-flight mass analysis is briefly\\u000a described. The application to the analysis of multielement metal samples and non-conducting powder mixtures of known composition\\u000a reveals the LASMA technique to be a semi-quantitative method for elemental bulk analysis with a detection limit around 50\\u000a ?g\\/g in a mass range up

D. M. Woll; M. Wahl; H. Oechsner

1999-01-01

396

Microwave operation of on-chip antenna embedded in WL-CSP [RFID applications  

Microsoft Academic Search

An on-chip antenna for microwave operation is demonstrated. The application of wafer-level chip-scale package (WL-CSP) techniques such as dual Cu electroplating conductive layers, and thick resin layers separating the conductive layer more than 10 ?m from the Si substrate, allow on-chip integration. Details of the antenna fabrication process and performance are presented. Antenna performance achieved a maximum communication range between

Hiroshi Abe; M. Sato; K. Itoi; S. Kawai; T. Tanaka; T. Hayashi; Y. Saitoh; T. Ito

2005-01-01

397

SADEP—a fuzzy diagnostic system shell-an application to fossil power plant operation  

Microsoft Academic Search

Artificial Intelligence applications in large-scale industry, such as fossil fuel power plants, require the ability to manage uncertainty and time. In these domains, the knowledge about the process comes from experts' experience and it is generally expressed in a vague-fuzzy way using ill-defined linguistic terms. In this paper, we present a fuzzy expert system shell to assist an operator of

L. Enrique Sucar

1998-01-01

398

SAR-Derived coastal and marine applications: from research to operational products  

Microsoft Academic Search

The synthetic aperture radar (SAR) has now successfully demonstrated its capacity to uniquely provide valuable high-resolution information for coastal applications (oil-spill monitoring, ship detection, shallow-water bathymetry mapping, sea-ice monitoring, high-resolution wind fields, coastal wave fields). However, it appears that the operational use of SAR-derived products still remains limited, particularly in Europe. Although costs and sampling rate are often invoked to

Vincent Kerbaol; Fabrice Collard

2005-01-01

399

Container Shipping: Operating System Support for I\\/O-Intensive Applications  

Microsoft Academic Search

We present an operating system facility for efficiently transferring very large volumes of data between multiple processes and I\\/O devices, benefitting I\\/O inten- sive applications such as multimedia (e.g. video and image) and scientific comput- ing. The execution of these programs often create an I\\/O pipeline , a set of processes that repeatedly carry out the following steps: a large

Joseph Pasquale; Eric W. Anderson; Keith Muller

1994-01-01

400

Rapid pentachlorophenol evaluation in solid matrixes by second derivative UV spectroscopy for application to wood and leather samples  

SciTech Connect

A method for the quail-quantitative evaluation of pentachlorophenol (PCP) in solid matrixes has been developed. The procedure is based on solid-liquid extraction of solid samples (leather or wood), followed by purification on a cyanopropyl column and determination of the preservative by second derivative UV spectroscopy considering the PCP A peak-through value (304-297 nm). The method allows rapid PCP determination in the concentration range 1-40 micrograms/mL; any matrix interference is avoided by the purification step and recoveries of the preservative were 99.12% (RSD% 0.13) for the leather matrix and 98.03 (RSD% 0.17) for the wood matrix.

Secchieri, M.; Benassi, C.A.; Pastore, S.; Semenzato, A.; Bettero, A.; Levorato, M.; Guerrato, A. (Universita di Padova, Dipartimento di Scienze Farmaceutiche (Italy))

1991-07-01

401

Atom, Atom-Type, and Total Linear Indices of the “Molecular Pseudograph’s Atom Adjacency Matrix”: Application to QSPR\\/QSAR Studies of Organic Compounds  

Microsoft Academic Search

In this paper we describe the application in QSPR\\/QSAR studies of a new group of molecular descriptors: atom, atom-type and total linear indices of the molecular pseudograph's atom adjacency matrix. These novel molecular descriptors were used for the prediction of boiling point and partition coefficient (log P), specific rate constant (log k), and antibacterial activity of 28 alkyl-alcohols and 34

Yovani Marrero Ponce; Juan Alberto Castillo Garit; Francisco Torrens; Vicente Romero Zaldivar; Eduardo A. Castro

2004-01-01

402

Newton Leibniz integration for ket bra operators in quantum mechanics (IV)—Integrations within Weyl ordered product of operators and their applications  

NASA Astrophysics Data System (ADS)

We show that the technique of integration within normal ordering of operators [Hong-yi Fan, Hai-liang Lu, Yue Fan, Ann. Phys. 321 (2006) 480 494] applied to tackling Newton Leibniz integration over ket bra projection operators, can be generalized to the technique of integration within Weyl ordered product (IWWOP) of operators. The Weyl ordering symbol ? is introduced to find the Wigner operator’s Weyl ordering form ?(p,q) = ? ?(p - P)?(q - Q) ?, and to find operators’ Weyl ordered expansion formula. A remarkable property is that Weyl ordering of operators is covariant under similarity transformation, so it has many applications in quantum statistics and signal analysis. Thus the invention of the IWWOP technique promotes the progress of Dirac’s symbolic method.

Fan, Hong-Yi

2008-02-01

403

Application of Mueller matrix and near fields measurements to detect and identify trace species in drugs and threat agents  

NASA Astrophysics Data System (ADS)

Since biological materials possess some degree of chirality a full wave solution for the scattering of electromagnetic waves (including optical and infra-red wavelengths) at an irregular interface between free space and a chiral medium is derived. To this and the electromagnetic fields are expressed in terms of Generalized Fourier Transforms. These transforms provide the basis for converting Maxwells equations, together with the associated exact boundary conditions, into Gneralized Telegraphists' Equations for irregular stratified media. Scattered near fields as well as far fields can be obtained from the solutions for the Generalized Telegraphists equations. The Mueller elements are related to the linear like and cross polarized far field scattering matrix. All sixteen Mueller Matrix elements of Bio-Medical Materials are examined. Special attention is given to the eight quasi off diagonal elements of the Mueller Matrix in order to examine the feasibility for detection and identification of bio-medical materials. The specific impact of chirality on the Mueller Matrix elements is analyzed. It is shown that (to within first order of the chirality parameter) only the eight quasi off diagonal elements of the Mueller Matrix are effected by the chiral property of the bio-medical materials. This reinforces the experimental observation from previous scattering experiments that the quasi off diagonal Mueller Matrix elements could provide a basis for bio-medical detection and identification. The analysis provides the explicit relationship between the quasi off diagonal elements and the degree of chirality of the bio-medical materials.

Bahar, Ezekiel

2005-11-01

404

Matrix elements of operators in symmetrical U(6)containsU(3)containsU(2)containsU(1) and U(6)containsSU(3)containsSO(3)containsSO(2) basis  

SciTech Connect

In this paper we consider a basis for N boson states classified by the chain of groups U(6)containsU(3)containsU(2)containsU(1). We determine analytical expressions for the matrix elements of the boson creation and annihilation operators, as well as for the U(6) generators, with respect to that basis. For such purpose, we use the Wigner--Eckart theorem with respect to U(3) and calculate the reduced matrix elements of the appropriate irreducible tensors from their matrix elements between highest weight states. Then we apply the transformation brackets from the chain U(6)containsU(3)containsU(2)containsU(1) to the physical chain U(6)containsSU(3)containsSO(3)containsSO(2) to obtain the matrix elements of the above-mentioned operators in a basis corresponding to the latter. The matrix elements so determined can be used either in the nuclear interacting boson model of Arima and Iachello or in the microscopic nuclear collective model of Vanagas et al.

Quesne, C.

1981-07-01

405

Application of data assimilation in portable operational forecasting systems—the DATools assimilation environment  

NASA Astrophysics Data System (ADS)

The first part of the paper describes a portable and flexible data assimilation environment (DATools) for easy application of data assimilation and calibration techniques to models that are used in smaller-scale engineering applications, for example to guide temporary offshore construction works, marine surveying and salvage operations. These applications are characterized by the need for detailed forecasts of often strongly non-linear marine behaviour in shallow-shelf seas under constraints of limited field measurements and absence of large-scale computing facilities. The applications are often prepared, and their results are interpreted by end-user engineers in field offices, not well acquainted with the data assimilation theory. The DATools data assimilation environment has been designed to facilitate such applications. It presently features an ensemble Kalman filter and two particle filters. These can be coupled to any process model in a standardized way through the so-called Published Interface that is used in an increasing number of flood-forecasting applications across Europe. The design of the system and its main modules are discussed, looking at the system from a non-specialist user perspective and focusing on modularity, transparency, user guidance, intuitive and flexible uncertainty prescription. The second part of the paper describes a typical example application of data assimilation in an engineering environment for which the modelling environment has been developed: the daily forecast of current and salinity profiles to guide construction works in Osaka Bay. An ensemble Kalman filter-based steady-state Kalman filter is developed for assimilation of salinity and horizontal currents into an existing three-dimensional flow model for the highly non-linear stratified shallow bay. Calibration results are summarised for both hindcast mode and forecast mode. After assessment of the results, a second, improved model setup is described, including now assimilation of temperature and water level as well as currents and salinity. The calibration results are shown to improve further. Both applications show that significant forecast improvements can be possible with data assimilation in typical engineering applications, notwithstanding operational constraints such as limited measurement data and restricted computational infrastructure. It is argued that the described portable data assimilation environment is well suited for temporary engineering applications as it provides typical end-user functionalities for data assimilation and will so allow the user to focus on the characteristics of the physical processes and interpretation of the results instead of on details of the mathematical techniques. This should make practical data assimilation accessible for a much wider (end) user community in oceanography and offshore.

El Serafy, Ghada Y.; Gerritsen, Herman; Hummel, Stef; Weerts, Albrecht H.; Mynett, Arthur E.; Tanaka, Masahiro

2007-10-01

406

47 CFR 25.137 - Application requirements for earth stations operating with non-U.S. licensed space stations.  

Code of Federal Regulations, 2012 CFR

...stations operating with non-U.S. licensed space stations. 25.137 Section 25.137...stations operating with non-U.S. licensed space stations. (a) Earth station applicants...to operate with a non-U.S. licensed space station to serve the United...

2012-10-01

407

47 CFR 25.137 - Application requirements for earth stations operating with non-U.S. licensed space stations.  

Code of Federal Regulations, 2011 CFR

...stations operating with non-U.S. licensed space stations. 25.137 Section 25.137...stations operating with non-U.S. licensed space stations. (a) Earth station applicants...to operate with a non-U.S. licensed space station to serve the United...

2011-10-01

408

Nonorthogonal orbital based N-body reduced density matrices and their applications to valence bond theory. I. Hamiltonian matrix elements between internally contracted excited valence bond wave functions.  

PubMed

In this series, the n-body reduced density matrix (n-RDM) approach for nonorthogonal orbitals and their applications to ab initio valence bond (VB) methods are presented. As the first paper of this series, Hamiltonian matrix elements between internally contracted VB wave functions are explicitly provided by means of nonorthogonal orbital based RDM approach. To this end, a more generalized Wick's theorem, called enhanced Wick's theorem, is presented both in arithmetical and in graphical forms, by which the deduction of expressions for the matrix elements between internally contracted VB wave functions is dramatically simplified, and the matrix elements are finally expressed in terms of tensor contractions of electronic integrals and n-RDMs of the reference VB self-consistent field wave function. A string-based algorithm is developed for the purpose of evaluating n-RDMs in an efficient way. Using the techniques presented in this paper, one is able to develop new methods and efficient algorithms for nonorthogonal orbital based many-electron theory much easier than by use of the first quantized formulism. PMID:23635123

Chen, Zhenhua; Chen, Xun; Wu, Wei

2013-04-28

409

Nonorthogonal orbital based N-body reduced density matrices and their applications to valence bond theory. I. Hamiltonian matrix elements between internally contracted excited valence bond wave functions  

NASA Astrophysics Data System (ADS)

In this series, the n-body reduced density matrix (n-RDM) approach for nonorthogonal orbitals and their applications to ab initio valence bond (VB) methods are presented. As the first paper of this series, Hamiltonian matrix elements between internally contracted VB wave functions are explicitly provided by means of nonorthogonal orbital based RDM approach. To this end, a more generalized Wick's theorem, called enhanced Wick's theorem, is presented both in arithmetical and in graphical forms, by which the deduction of expressions for the matrix elements between internally contracted VB wave functions is dramatically simplified, and the matrix elements are finally expressed in terms of tensor contractions of electronic integrals and n-RDMs of the reference VB self-consistent field wave function. A string-based algorithm is developed for the purpose of evaluating n-RDMs in an efficient way. Using the techniques presented in this paper, one is able to develop new methods and efficient algorithms for nonorthogonal orbital based many-electron theory much easier than by use of the first quantized formulism.

Chen, Zhenhua; Chen, Xun; Wu, Wei

2013-04-01

410

Performance Analysis of the SIFT Operator for Automatic Feature Extraction and Matching in Photogrammetric Applications.  

PubMed

In the photogrammetry field, interest in region detectors, which are widely used in Computer Vision, is quickly increasing due to the availability of new techniques. Images acquired by Mobile Mapping Technology, Oblique Photogrammetric Cameras or Unmanned Aerial Vehicles do not observe normal acquisition conditions. Feature extraction and matching techniques, which are traditionally used in photogrammetry, are usually inefficient for these applications as they are unable to provide reliable results under extreme geometrical conditions (convergent taking geometry, strong affine transformations, etc.) and for bad-textured images. A performance analysis of the SIFT technique in aerial and close-range photogrammetric applications is presented in this paper. The goal is to establish the suitability of the SIFT technique for automatic tie point extraction and approximate DSM (Digital Surface Model) generation. First, the performances of the SIFT operator have been compared with those provided by feature extraction and matching techniques used in photogrammetry. All these techniques have been implemented by the authors and validated on aerial and terrestrial images. Moreover, an auto-adaptive version of the SIFT operator has been developed, in order to improve the performances of the SIFT detector in relation to the texture of the images. The Auto-Adaptive SIFT operator (A(2) SIFT) has been validated on several aerial images, with particular attention to large scale aerial images acquired using mini-UAV systems. PMID:22412336

Lingua, Andrea; Marenchino, Davide; Nex, Francesco

2009-05-18

411

Performance Analysis of the SIFT Operator for Automatic Feature Extraction and Matching in Photogrammetric Applications  

PubMed Central

In the photogrammetry field, interest in region detectors, which are widely used in Computer Vision, is quickly increasing due to the availability of new techniques. Images acquired by Mobile Mapping Technology, Oblique Photogrammetric Cameras or Unmanned Aerial Vehicles do not observe normal acquisition conditions. Feature extraction and matching techniques, which are traditionally used in photogrammetry, are usually inefficient for these applications as they are unable to provide reliable results under extreme geometrical conditions (convergent taking geometry, strong affine transformations, etc.) and for bad-textured images. A performance analysis of the SIFT technique in aerial and close-range photogrammetric applications is presented in this paper. The goal is to establish the suitability of the SIFT technique for automatic tie point extraction and approximate DSM (Digital Surface Model) generation. First, the performances of the SIFT operator have been compared with those provided by feature extraction and matching techniques used in photogrammetry. All these techniques have been implemented by the authors and validated on aerial and terrestrial images. Moreover, an auto-adaptive version of the SIFT operator has been developed, in order to improve the performances of the SIFT detector in relation to the texture of the images. The Auto-Adaptive SIFT operator (A2 SIFT) has been validated on several aerial images, with particular attention to large scale aerial images acquired using mini-UAV systems.

Lingua, Andrea; Marenchino, Davide; Nex, Francesco

2009-01-01

412

Membrane-mirror-based autostereoscopic display for tele-operation and teleprescence applications  

NASA Astrophysics Data System (ADS)

An autostereoscopic display for telepresence and tele- operation applications has been developed at the University of Strathclyde in Glasgow, Scotland. The research is a collaborative effort between the Imaging Group and the Transparent Telepresence Research Group, both based at Strathclyde. A key component of the display is the directional screen; a 1.2-m diameter Stretchable Membrane Mirror is currently used. This patented technology enables large diameter, small f No., mirrors to be produced at a fraction of the cost of conventional optics. Another key element of the present system is an anthropomorphic and anthropometric stereo camera sensor platform. Thus, in addition to mirror development, research areas include sensor platform design focused on sight, hearing, research areas include sensor platform design focused on sight, hearing, and smell, telecommunications, display systems for all visual, aural and other senses, tele-operation, and augmented reality. The sensor platform is located at the remote site and transmits live video to the home location. Applications for this technology are as diverse as they are numerous, ranging from bomb disposal and other hazardous environment applications to tele-conferencing, sales, education and entertainment.

McKay, Stuart; Mair, Gordon M.; Mason, Steven; Revie, Kenneth

2000-05-01

413

Combined Arms Brigades in AirLand Operations: The Airland Operations Application of Combined Arms Brigades at the Operational Level of War.  

National Technical Information Service (NTIS)

The purpose of this paper is to analyze the viability of combined arms brigade employment in AirLand Operations. As criteria, the study imposes the Operational Operating Systems (OOS) contained in the April 15, 1990 TRADOC Pam 11-9, Army to determine whet...

W. M. Jacobs

1991-01-01

414

Spectral approximations of unbounded nonselfadjoint operators  

NASA Astrophysics Data System (ADS)

We consider the operator A=S+B, where S is an unbounded normal operator in a separable Hilbert space H, having a compact inverse one and B is a linear operator in H, such that BS^{-1} is compact. Let \\{e_k\\}_{k=1}^infty be the normalized eigenvectors of S and B be represented in \\{e_k\\}_{k=1}^infty by a matrix (b_{jk})_{j,k=1}^infty . We approximate the eigenvalues of A by a combination of the eigenvalues of S and the eigenvalues of the finite matrix {(b_{jk})}_{j,k=1}n. Applications of to differential operators are also discussed.

Gil', Michael

2013-03-01

415

Session: Development and application of guidelines for siting, constructing, operating and monitoring wind turbines  

SciTech Connect

This session at the Wind Energy and Birds/Bats workshop consisted of two presentations followed by a discussion/question and answer period. The two papers were: 'Development and Application of USFWS Guidance for Site Evaluation, Siting, Construction, Operation and Monitoring of Wind Turbines' by Albert Manville and 'Wind Power in Washington State' by Greg Hueckel. The session provided a comparison of wind project guidelines developed by the U.S. Fish and Wildlife Service (USFWS) in May 2003 and the Washington State Department of Fish and Wildlife in August 2003. Questions addressed included: is there a need or desire for uniform national or state criteria; can other states learn from Washington State's example, or from the USFWS voluntary guidelines; should there be uniform requirements/guidelines/check-lists for the siting, operation, monitoring, and mitigation to prevent or minimize avian, bat, and other wildlife impacts.

Manville, Albert; Hueckel, Greg

2004-09-01

416

Applications of operant learning theory to the management of challenging behavior after traumatic brain injury.  

PubMed

For more than 3 decades, interventions derived from learning theory have been delivered within a neurobehavioral framework to manage challenging behavior after traumatic brain injury with the aim of promoting engagement in the rehabilitation process and ameliorating social handicap. Learning theory provides a conceptual structure that facilitates our ability to understand the relationship between challenging behavior and environmental contingencies, while accommodating the constraints upon learning imposed by impaired cognition. Interventions derived from operant learning theory have most frequently been described in the literature because this method of associational learning provides good evidence for the effectiveness of differential reinforcement methods. This article therefore examines the efficacy of applying operant learning theory to manage challenging behavior after TBI as well as some of the limitations of this approach. Future developments in the application of learning theory are also considered. PMID:21552069

Wood, Rodger Ll; Alderman, Nick

417

Application of hardware-in-the-loop simulation to operational test and evaluation  

NASA Astrophysics Data System (ADS)

The rapid advance of computer technology and advances in image generation and projection have provided unprecedented growth in the fidelity of hardware-in-the-loop (HITL) simulation. HITL simulation has improved to a level where it can support operational test and evaluation, often providing better insight into system performance than traditional open-air flight tests. This comes at a time of increasing open-air test costs and decreasing test budgets, two factors that are driving the movement for simulation based acquisition. We present two case studies on the application of HITL simulation to the operational test of the AGM-65 Maverick missile system. These studies demonstrate their fidelity of modern HITL simulation, highlight the benefits derived from this testing, and examine the cultural and technical impediments hindering the wider acceptance of simulation based acquisition efforts.

Cocanougher, David S.; Mirsky, Samuel A.; Card, Darrell B.

1999-07-01

418

Applications of neural networks to monitoring and decision making in the operation of nuclear power plants  

SciTech Connect

Application of neural networks to monitoring and decision making in the operation of nuclear power plants is being investigated under a US Department of Energy sponsored program at the University of Tennessee. Projects include the feasibility of using neural networks for the following tasks: (1) diagnosing specific abnormal conditions or problems in nuclear power plants, (2) detection of the change of mode of operation of the plant, (3) validating signals coming from detectors, (4) review of noise'' data from TVA's Sequoyah Nuclear Power Plant, and (5) examination of the NRC's database of Letter Event Reports'' for correlation of sequences of events in the reported incidents. Each of these projects and its status are described briefly in this paper. This broad based program has as its objective the definition of the state-of-the-art in using neural networks to enhance the performance of commercial nuclear power plants.

Uhrig, R.E. (Tennessee Univ., Knoxville, TN (United States) Oak Ridge National Lab., TN (United States))

1990-01-01

419

The application of total quality management principles to spacecraft mission operations  

NASA Astrophysics Data System (ADS)

By now, the philosophies of Total Quality Management have had an impact on every aspect of American industrial life. The trail-blazing work of Deming, Juran, and Crosby, first implemented in Japan, has 're-migrated' across the Pacific and now plays a growing role in America's management culture. While initially considered suited only for a manufacturing environment, TQM has moved rapidly into the 'service' areas of offices, sales forces, and even fast-food restaurants. The next logical step has also been taken - TQM has found its way into virtually all departments of the Federal Government, including NASA. Because of this widespread success, it seems fair to ask whether this new discipline is directly applicable to the profession of spacecraft operations. The results of quality emphasis on OAO Corporation's contract at JPL provide strong support for Total Quality Management as a useful tool in spacecraft operations.

Sweetin, Maury

1993-03-01

420

Application of Bayesian networks in quantitative risk assessment of subsea blowout preventer operations.  

PubMed

This article proposes a methodology for the application of Bayesian networks in conducting quantitative risk assessment of operations in offshore oil and gas industry. The method involves translating a flow chart of operations into the Bayesian network directly. The proposed methodology consists of five steps. First, the flow chart is translated into a Bayesian network. Second, the influencing factors of the network nodes are classified. Third, the Bayesian network for each factor is established. Fourth, the entire Bayesian network model is established. Lastly, the Bayesian network model is analyzed. Subsequently, five categories of influencing factors, namely, human, hardware, software, mechanical, and hydraulic, are modeled and then added to the main Bayesian network. The methodology is demonstrated through the evaluation of a case study that shows the probability of failure on demand in closing subsea ram blowout preventer operations. The results show that mechanical and hydraulic factors have the most important effects on operation safety. Software and hardware factors have almost no influence, whereas human factors are in between. The results of the sensitivity analysis agree with the findings of the quantitative analysis. The three-axiom-based analysis partially validates the correctness and rationality of the proposed Bayesian network model. PMID:23106231

Cai, Baoping; Liu, Yonghong; Liu, Zengkai; Tian, Xiaojie; Zhang, Yanzhen; Ji, Renjie

2012-10-29

421

Newton Leibniz integration for ket bra operators (II)—application in deriving density operator and generalized partition function formula  

NASA Astrophysics Data System (ADS)

Via the route of applying Newton Leibniz integration rule to Dirac’s symbolic operators, we show that the density operator e-?H, where H is multi-mode quadratic interacting boson operators, is a mapping of symplectic transformation in the coherent state representation appearing in the form of non-symmetric ket bra operator integration. By virtue of the technique of integration within an ordered product (IWOP) of operators, we deduce its normally ordered form which directly leads to the generalized partition function formula and the Wigner function. Some new representations, such as displacement-squeezing correlated squeezed coherent states, constructed by the IWOP technique, also bring convenience in deriving partition functions.

Fan, Hong-Yi

2007-04-01

422

A tempering approach for Itakura-Saito non-negative matrix factorization. With application to music transcription  

Microsoft Academic Search

In this paper we are interested in non-negative matrix factorization (NMF) with the Itakura-Saito (IS) divergence. Previous work has demonstrated the relevance of this cost function for the decompo- sition of audio power spectrograms. This is in particular due to its scale invariance, which makes it more robust to the wide dynamics of audio, a property which is not shared

Nancy Bertin; Cédric Févotte; Roland Badeau

2009-01-01

423

New Perturbative Approach to the Application of Low-Energy Electron Diffraction-the t-Matrix Formalism.  

National Technical Information Service (NTIS)

The authors present a new t-matrix formulation of the perturbation approach to the theory of low-energy electron diffraction. Good agreement is obtained between theory and experiment for the (100) and (110) clean surfaces of aluminum and nickel. Speed and...

R. H. Tait S. Y. Tong T. N. Rhodin

1971-01-01

424

Oscillation Theory and Computational Procedures for Matrix Sturm-Liouville Eigenvalue Problems, with an Application to the Hydrogen Molecular Ion.  

National Technical Information Service (NTIS)

A generalized Prufer transformation is used to derive comparison and oscillation theorems for the matrix Sturm-Liouville eigenvalue problem. It is shown in particular that if the eigenvectors are required to vanish at one (at least) of the end points, the...

J. M. Calvert W. D. Davison

1968-01-01

425

Applicability of the Somatomorphic Matrix computer program in Japanese and Australian Caucasian males in relation to measured body composition  

Microsoft Academic Search

The Somatomorphic Matrix (SM) is a computer-based body image assessment program that allows assessment of the individual's body image in relation to known body composition values. To date, no study has compared the SM results to the measured body composition and assessed the usefulness in multi-ethnic samples. Japanese and Australian Caucasian males underwent testing to examine the SM body image

Masaharu Kagawa; Deborah Kerr; Satvinder Dhaliwal; Andrew P. Hills; Colin W. Binns

2006-01-01

426

The development of a preselection physical fitness training program for Canadian Special Operations Regiment applicants.  

PubMed

Special Operations Forces (SOF) soldiers must undergo a rigorous selection process that requires high levels of physical fitness and stamina to complete. Physical preparedness is crucial for an applicant's performance during a selection process; preselection physical training programs for SOF applicants must be specific to the demands of the selection process. The purpose of this study was to analyze the physical demands of the Canadian Special Operations Regiment (CSOR) Assessment Center (AC) to develop an evidence-based physical fitness program to assist future applicants to CSOR with their physical preparation. Seventy-one men volunteered to undergo a battery of fitness tests before attending the CSOR AC. Forty-six (mean [SD]: age 26.2 [4.4] years, height 176.5 [7.4] cm, body mass 82.4 [10.1] kg) of the 71 participants further volunteered to participate in the characterization of the physical demands of the AC. Heart rate (HR) data were collected during the physically demanding sessions, and a subsequent task and physiological analysis was conducted to determine key performance variables for exercise prescription. The physically demanding sessions ranged in length from 26.38 (4.24) minutes to 668.52 (30.09) minutes, with the mean HR data ranging from 169.81 (6.64) to 97.51 (6.65) b·min?¹, respectively. Key predictors of completion of the AC were V[Combining Dot Above]O2peak (?exp: 5.92; confidence interval [CI]: 1.1-31.0), and 1-repetition maximum (1RM) squats (?exp: 5.16; CI: 1.2-22.2). The information derived from this study provided the foundation for the design of an evidence-based preparatory training program for future applicants that is reflective of the physical demands of the selection process. PMID:22643138

Carlson, Mark J; Jaenen, Suzanne P

2012-07-01

427

Multiplexed aptasensors and amplified DNA sensors using functionalized graphene oxide: application for logic gate operations.  

PubMed

Graphene oxide (GO) is implemented as a functional matrix for developing fluorescent sensors for the amplified multiplexed detection of DNA, aptamer-substrate complexes, and for the integration of predesigned DNA constructs that activate logic gate operations. Fluorophore-labeled DNA strands acting as probes for two different DNA targets are adsorbed onto GO, leading to the quenching of the luminescence of the fluorophores. Desorption of the probes from the GO, through hybridization with the target DNAs, leads to the fluorescence of the respective label. By coupling exonuclease III, Exo III, to the system, the recycling of the target DNAs is demonstrated, and this leads to the amplified detection of the DNA targets (detection limit 5 × 10(-12) M). Similarly, adsorption of fluorophore-functionalized aptamers against thrombin or ATP onto the GO leads to the desorption of the aptamer-substrate complexes from GO and to the triggering of the luminescence corresponding to the respective fluorophore, thus, allowing the multiplexed analysis of the aptamer-substrate complexes. By designing functional fluorophore-labeled DNA constructs and their interaction with GO, in the presence (or absence) of nucleic acids, or two different substrates for aptamers, as inputs, the activation of the "OR" and "AND" logic gates is demonstrated. PMID:22404375

Liu, Xiaoqing; Aizen, Ruth; Freeman, Ronit; Yehezkeli, Omer; Willner, Itamar

2012-03-26

428

Application of signature analysis for determining the operational readiness of motor-operated valves under blowdown test conditions  

Microsoft Academic Search

In support of the NRC-funded Nuclear Plant Aging Research (NPAR) program, Oak Ridge National Laboratory (ORNL) has carried out a comprehensive aging assessment of Motor-Operated Valves (MOVs). As part of this work, ORNL participated in the Gate Valve Flow Interruption Blowdown (GVFIB) tests carried out in Huntsville, Alabama. The GVFIB tests were intended primarily to determine the behavior of motor-operated

1988-01-01

429

Application of ultraviolet fluorometry and excitation-emission matrix spectroscopy (EEMS) to fingerprint oil and chemically dispersed oil in seawater.  

PubMed

Excitation-emission matrix spectroscopy (EEMS) was used to characterize the ultra violet fluorescence fingerprints of eight crude oils (with a 14,470-fold range of dynamic viscosity) in seawater. When the chemical dispersant Corexit 9500 was mixed with the oils prior to their dispersion in seawater, the fingerprints of each oil changed primarily as an increase in fluorescence over an emission band centered on 445 nm. In order to simplify the wealth of information available in the excitation-emission matrix spectra (EEMs), two ratios were calculated. A 66-90% decrease in the slope ratio was observed with the addition of Corexit. When the slope ratios were reduced in complexity to intensity ratios, similar trends were apparent. As a result either of the ratios could be used as a simple and rapid means of identifying and monitoring chemically dispersed oil in the open ocean. PMID:18304589

Bugden, J B C; Yeung, C W; Kepkay, P E; Lee, K

2008-03-04

430

Synthesis and physical properties of new layered double hydroxides based on ionic liquids: application to a polylactide matrix.  

PubMed

Ionic liquids based on tetraalkylphosphonium salts combined with different anions (decanoate and dodecylsulfonate) have been used as intercalating agents of layered double hydroxides (LDHs) by ion exchange. The synthesized phosphonium-treated LDHs display a dramatically improved thermal degradation and a significant increase in the interlayer distance as confirmed by thermogravimetric analysis (TGA) and X-ray Diffraction (XRD), respectively. To highlight the effect of thermostable ionic liquids, a very low amount of LDHs has been introduced within a polylactide (PLA) matrix and PLA/LDHs nanocomposites have been processed in melt by twin-screw extrusion. Then, transmission electron microscopy (TEM) analysis has been used to investigate the influence of ILs on the different morphologies of these nanocomposites. Even though the thermal stability of PLA matrix decreased, an excellent stiffness-toughness compromise has been obtained. PMID:22999461

Livi, Sébastien; Bugatti, Valeria; Estevez, Luis; Duchet-Rumeau, Jannick; Giannelis, Emmanuel P

2012-08-28

431

Statistical characterization of C-arm distortion with application to intra-operative distortion correction  

NASA Astrophysics Data System (ADS)

C-arm images suffer from pose dependant distortion, which needs to be corrected for intra-operative quantitative 3D surgical guidance. Several distortion correction techniques have been proposed in the literature, the current state of art using a dense grid pattern rigidly attached to the detector. These methods become cumbersome for intra-operative use, such as 3D reconstruction, since the grid pattern interferes with patient anatomy. The primary contribution of this paper is a framework to statistically analyze the distortion pattern which enables us to study alternate intra-operative distortion correction methods. In particular, we propose a new phantom that uses very few BBs, and yet accurately corrects for distortion. The high dimensional space of distortion pattern can be effectively characterized by principal component analysis (PCA). The analysis shows that only first three eigen modes are significant and capture about 99% of the variation. Phantom experiments indicate that distortion map can be recovered up to an average accuracy of less than 0.1 mm/pixel with these three modes. With this prior statistical knowledge, a subset of BBs can be sufficient to recover the distortion map accurately. Phantom experiments indicate that as few as 15 BBs can recover distortion with average error of 0.17 mm/pixel, accuracy sufficient for most clinical applications. These BBs can be arranged on the periphery of the C-arm detector, minimizing the interference with patient anatomy and hence allowing the grid to remain attached to the detector permanently. The proposed method is fast, economical, and C-arm independent, potentially boosting the clinical viability of applications such as quantitative 3D fluoroscopic reconstruction.

Chintalapani, Gouthami; Jain, Ameet K.; Taylor, Russell H.

2007-03-01

432

SSA Building Blocks - Transforming Your Data and Applications into Operational Capability  

NASA Astrophysics Data System (ADS)

The Electronic System Center's 850 Electronic Systems Group (ELSG) is currently using a Service Oriented Architecture (SOA) to rapidly create net-centric experimental prototypes. This SOA has been utilized effectively across diverse mission areas, such as global air operations and rapid sensor tasking for improved space event management. The 850 ELSG has deployed a working, accredited, SOA on the SIPRNET and provided real-time space information to five separate distributed operations centers. The 850 ELSG has learned first-hand the power of SOAs for integrating DoD and non-DoD SSA data in a rapid and agile manner, allowing capabilities to be fielded and sensors to be integrated in weeks instead of months. This opens a world of opportunity to integrate University data and experimental or proof-of-concept data with sensitive sensors and sources to support developing an array of SSA products for approved users in and outside of the space community. This paper will identify how new capabilities can be proactively developed to rapidly answer critical needs when SOA methodologies are employed and identifies the operational utility and the far-reaching benefits realized by implementing a service-oriented architecture. We offer a new paradigm for how data and application producer's contributions are presented for the rest of the community to leverage.

Buell, D.; Hawthorne, Shayn, L.; Higgins, J.

433

Coherent-potential and average t-matrix approximations for disordered muffin-tin alloys. II. Application to realistic systems  

Microsoft Academic Search

In an earlier article, the electronic spectrum of the disordered alloy AxB1-x, using the coherent-potential (CPA) and the average t-matrix (ATA) approximations, was discussed within the framework of the muffintin Hamiltonian. Using the illustrative examples of CuxNi1-x and CuxZn1-x, the present paper exposes the physically relevant aspects of the electronic spectra of disordered transition and noble-metal alloys. Bloch spectral densities,

A. Bansil

1979-01-01

434

A numerical model for coupled fluid flow and matrix deformation with applications to disequilibrium compaction and delta stability  

Microsoft Academic Search

A model is developed which couples fully saturated porous compaction to the viscous-plastic deformation of the skeleton matrix. The Darcy fluid flow during compaction is described by an advection-diffusion equation for the excess pressure with two source\\/sink terms that depend on the mechanical compressibility and viscous compaction of the pore space, the latter representing the effect of pressure solution. The

Christina Morency; Ritske S. Huismans; Christopher Beaumont; Philippe Fullsack

2007-01-01

435

Topical Application of 17?-Estradiol Increases Extracellular Matrix Protein Synthesis by Stimulating TGF-? Signaling in Aged Human Skin In Vivo  

Microsoft Academic Search

To investigate the effects of topically applied 17?-estradiol on the expression of extracellular matrix proteins in aged human skin, 17?-estradiol (0.01%) and its vehicle (70% propylene glycol, 30% ethanol) were applied to aged (68–82 y, eight females and five males) human buttock skin under occlusion for 2 wk (three times per week). Topical 17?-estradiol was found to increase the expression

Eui Dong Son; Jin Young Lee; Serah Lee; Mi Sun Kim; Byeong Gon Lee; Ih Seoup Chang; Jin Ho Chung

2005-01-01

436

Low temperature Aluminum induced crystallization process to get Poly silicon films for thin film transistor application in active matrix displays  

Microsoft Academic Search

The realization of high information-content active matrix flat-panel displays (FPD's) requires low temperature thin film transistor (TFT) process that is compatible with the thermal constraints imposed by common inexpensive glass panels. Aluminum induced crystallization (AIC) has been researched extensively for producing poly-Si from a-Si. In this paper Aluminum- induced crystallization (AIC) in amorphous silicon films deposited by Hot Wire CVD

Hitesh Chelawat; Alka Kumbhar; Subhra Adhikari; Hrishikesk Kelkar; R. O. Dusane

437

ac transport studies in polymers by resistor-network and transfer-matrix approaches: Application to polyaniline  

Microsoft Academic Search

A statistical model of resistor network is proposed to describe a polymer\\u000astructure and to simulate the real and imaginary components of its ac\\u000aresistivity. It takes into account the polydispersiveness of the material as\\u000awell as intrachain and interchain charge transport processes. By the\\u000aapplication of a transfer matrix technique, it reproduces ac resistivity\\u000ameasurements carried out with polyaniline

H. N. Nagashima; R. N. Onody; R. M. Faria

1999-01-01

438

Application of the ithink ® System Dynamics Software Program to the Social Fabric Matrix to Analyze Public School Finance Systems  

Microsoft Academic Search

State finance systems for public elementary and secondary education are a complex institution of court decisions and state\\u000a statutes, working together as rules of law, agency rules and regulations, and administrative codes. The ithink® Analyst system dynamics software program and the social fabric matrix (SFM) were used for a public school finance lawsuit in the\\u000a state of Nebraska. A model

Jerry L. Hoffman

439

Potential Industrial Applications of the One Atmosphere Uniform Glow Discharge Plasma (OAUGDP) Operating in Ambient Air  

NASA Astrophysics Data System (ADS)

The majority of industrial plasma processing with glow discharges has been conducted at pressures below 10 torr. This tends to limit applications to high value workpieces as a result of the high capital cost of vacuum systems and the production constraints of batch processing. It has long been recognized that glow discharge plasmas would play a much larger industrial role if they could be generated at one atmosphere. The One Atmosphere Uniform Glow Discharge Plasma (OAUGDP), developed at the University of Tennessee's Plasma Sciences Laboratory, is a non-thermal RF plasma operating on displacement currents with the time-resolved characteristics of a classical low pressure DC normal glow discharge. As a glow discharge, the OAUGDP operates with maximum electrical efficiency at the Stoletow point, where the energy input per ion-electron pair is a minimum [1, 2]. Several interdisciplinary teams have investigated potential applications of the OAUGDP. These teams included collaborators from the UTK Textiles and Nonwovens Development Center (TANDEC), and the Departments of Electrical and Computer Engineering, Microbiology, and Food Science and Technology, as well as the NASA Langley Research Center. The potential applications of the OAUGDP have all been at one atmosphere and room temperature, using air as the working gas. These applications include sterilizing medical and dental equipment; sterilizable air filters to deal with the "sick building syndrome"; removal of soot from Diesel engine exhaust; subsonic plasma aerodynamic effects, including flow re-attachment to airfoils and boundary layer modification; electrohydrodynamic (EDH) flow control of working gases; increasing the surface energy of materials; improving the adhesion of paints and electroplated layers: improving the wettability and wickability of fabrics; stripping of photoresist; and plasma deposition and directional etching of potential microelectronic relevance. [1] J. R. Roth, Industrial Plasma Engineering: Volume I, Principles. Institute of Physics Publishing, Bristol and Philadelphia 1995, ISBN 0-7503-0318-2. [2] Roth, J. R. Industrial Plasma Engineering: Volume II Applications to Nonthermal Plasma Processing Institute of Physics Publishing, Bristol and Philadelphia. 2001, ISBN 0-7503-0545-2.

Reece Roth, J.

2004-11-01

440

Application of signature analysis for determining the operational readiness of motor-operated valves under blowdown test conditions  

SciTech Connect

In support of the NRC-funded Nuclear Plant Aging Research (NPAR) program, Oak Ridge National Laboratory (ORNL) has carried out a comprehensive aging assessment of Motor-Operated Valves (MOVs). As part of this work, ORNL participated in the Gate Valve Flow Interruption Blowdown (GVFIB) tests carried out in Huntsville, Alabama. The GVFIB tests were intended primarily to determine the behavior of motor-operated gate valves under the temperature, pressure, and flow conditions expected to be experienced by isolation valves in Boiling Water Reactors (BWRs) during a high energy line break (blowdown) outside of containment. In addition, the tests provided an excellent opportunity to evaluate signature analysis methods for determining the operational readiness of the MOVs under those accident conditions. ORNL acquired motor current and torque switch shaft angular position data on two test MOVs during various times of the GVFIB tests. The reduction in operating ''margin'' of both MOVs due to the presence of additional valve running loads imposed by high flow was clearly observed in motor current and torque switch angular position signatures. In addition, the effects of differential pressure, fluid temperature, and line voltage on MOV operations were observed and more clearly understood as a result of utilizing signature analysis techniques. 1 ref.; 16 figs.

Haynes, H.D.

1988-01-01

441

Operational-scale application of entomopathogenic fungi for control of Sahelian grasshoppers  

PubMed Central

Locusts and grasshoppers regularly threaten agricultural production across large parts of the developed and developing worlds. Recent concerns over the health and environmental impacts of standard chemical control measures have led to a demand for alternative, more environmentally benign control technologies. Here we present the results of a field study to investigate the potential of inundative biological control for control of grasshoppers in the Sahelian region of Africa. The biocontrol agent was an oil-based biopesticide formulation of a naturally occurring entomopathogenic fungus, Metarhizium flavoviride. This was applied at a rate of 2l ha-1 to a total area of 150 ha using standard equipment normally used for the application of chemical pesticides. Twenty-one days after application, an 80 per cent reduction in grasshopper populations was recorded in treated plots, relative to control populations in equivalent unsprayed areas. We think that this is the first operational-scale application of a biopesticide to demonstrate significant population reductions of key Sahelian grasshopper pests. This represents a substantial development in locust and grasshopper control, and should open the way for a new era of integrated control strategies where reliance on conventional chemicals is reduced.

Kooyman, C.; Bateman, R. P.; Langewald, J.; Lomer, C. J.; Ouambama, Z.; Thomas, M. B.

1997-01-01

442

High-power diode lasers operating around 1500-nm for eyesafe applications  

NASA Astrophysics Data System (ADS)

Er:YAG solid state lasers offer an "eye-safe" alternative to traditional Nd:YAG lasers for use in military and industrial applications such as range-finding, illumination, flash/scanning LADAR, and materials processing. These laser systems are largely based on diode pumped solid state lasers that are subsequently (and inefficiently) frequency-converted using optical parametric oscillators. Direct diode pumping of Er:YAG around 1.5 ?m offers the potential for greatly increased system efficiency, reduced system complexity/cost, and further power scalability. Such applications have been driving the development of high-power diode lasers around these wavelengths. For end-pumped rod and fiber applications requiring high brightness, nLIGHT has developed a flexible package format, based on scalable arrays of single-emitter diode lasers and efficiently coupled into a 400 ?m core fiber. In this format, a rated power of 25 W is reported for modules operating at 1.47 ?m, with a peak electrical to optical conversion efficiency of 38%. In centimeter-bar on copper micro-channel cooler format, maximum continuous wave power in excess of 100 W at room temperature and conversion efficiency of 50% at 6C are reported. Copper heat sink conductively-cooled bars show a peak electrical-to-optical efficiency of 43% with 40 W of maximum continuous wave output power. Also reviewed are recent reliability results at 1907-nm.

Patterson, Steve; Leisher, Paul; Price, Kirk; Kennedy, Keith; Dong, Weimin; Grimshaw, Mike; Zhang, Shiguo; Patterson, Jason; Das, Suhit; Karlsen, Scott; Martinsen, Rob; Bell, Jake

2008-05-01

443

Optimization of Matrix Solid-Phase Dispersion method for simultaneous extraction of aflatoxins and OTA in cereals and its application to commercial samples.  

PubMed

A method based on Matrix Solid-Phase Dispersion (MSPD) has been developed for the determination of 5 mycotoxins (ochratoxin A and aflatoxins B and G) in different cereals. Several dispersants, eluents and ratios were tested during the optimization of the process in order to obtain the best results. Finally, samples were blended with C(18) and the mycotoxins were extracted with acetonitrile. Regarding to matrix effects, the results clearly demonstrated the necessity to use a matrix-matched calibration to validate the method. Analyses were performed by liquid chromatography-triple quadrupole-tandem mass spectrometry (LC-QqQ-MS/MS). The recoveries of the extraction process ranged from 64% to 91% with relative standard deviation lower than 19% in all cases, when samples were fortified at two different concentrations levels. Limits of detection ranged from 0.3 ng g(-1) for aflatoxins to 0.8 ng g(-1) for OTA and the limits of quantification ranged from 1 ng g(-1) for aflatoxins to 2 ng g(-1) for OTA, which were below the limits of mycotoxins set by European Union in the matrices evaluated. Application of the method to the analysis of several samples purchased in local supermarkets revealed aflatoxins and OTA levels. PMID:20602937

Rubert, Josep; Soler, Carla; Mañes, Jordi

2010-05-16

444

Microwave initiated synthesis of polyacrylamide grafted guar gum (GG-g-PAM)-Characterizations and application as matrix for controlled release of 5-amino salicylic acid.  

PubMed

This paper details the study of applicability of microwave initiated synthesized polyacrylamide grafted guar gum (GG-g-PAM) as matrix for controlled release of 5-amino salicylic acid (a drug used for the treatment of ulcerative colitis). In vitro release of this drug from various grades of GG-g-PAM has been studied by USP dissolution method (paddle type). The effect of percentage grafting on the rate of drug release has been investigated. The power of the microwave oven and other factors being kept constant, the percentage grafting in turn is dependent on the net time of exposure to microwave irradiation; thus a correlation can be drawn between net time of irradiation and rate of drug release (from the matrix). This holds the promise of a tailor-made matrix, with the rate of drug release being precisely programmed at the molecular level. Further, the drug release study was carried out in different pH medium, to investigate the possibility of pH triggered release for colon targeted drug delivery (where the pH is alkaline). PMID:20471416

Sen, Gautam; Mishra, Sumit; Jha, Usha; Pal, Sagar

2010-05-13

445

Image segmentation via adaptive K-mean clustering and knowledge-based morphological operations with biomedical applications  

Microsoft Academic Search

Image segmentation remains one of the major challenges in image analysis. In medical applications, skilled operators are usually employed to extract the desired regions that may be anatomically separate but statistically indistinguishable. Such manual processing is subject to operator errors and biases, is extremely time consuming, and has poor reproducibility. We propose a robust algorithm for the segmentation of three-dimensional

Chang Wen Chen; Jiebo Luo; Kevin J. Parker

1998-01-01

446

Drought and water scarcity indicators: experience and operational applications in italian basins  

NASA Astrophysics Data System (ADS)

In the framework of River Basin Managment Plans (RBMPs), according to the Water Framework Directive, prevention and mitigation of water scarcity and droughts are some of the most challenging tasks. In the last ten years Italy experienced the highest ever observed frequency of occurrence of drought/water scarcity events. As an example, the damages for the latest, country-wide drought event of summer 2012 exceeded one billion euros. On the other hand, according to the more recent reports on the risks of extreme events, there is evidence, providing a basis for medium confidence, that droughts will intensify over the coming century in southern Europe and in the Mediterranean region (IPCC 2012). Monitoring actions are necessary and extremely effective to "feel the pulse of the situation" about both natural availability and anthropic use of freshwater resources. In this context, referring to the Programmes of Measures of RBMPs, italian River Basin Authorities (RBA) are tackling the issue at different spatial scales, planning an operational use of different indicators, between theme the Water Exploitation Index (EEA, 2009) and some statistical indicators. In this context, Po and Arno River Basin authorities, with the support of ISPRA, are directly involved in the experimental application of some significant indicators combining climatic, hydrological and anthropic factors affecting water availability. Planning and operational experiences for the two main basins (Po and Arno) and for a list of smaller scale subbasins are presented, with a detailed description of data needs, range of application, spatial and temporal scale issues, and threshold definition. For each indicator, a critical analysis of strenghts and weaknesses (at data and response level) is reported, with particular regard to the feasibility of its use within water management and water planning actions at the river basin and district scale. Tests were carried out for the whole Po River and Northern Appennines districts, and for the basin of Arno, Trebbia and Oglio rivers, and included the following indicators: modified Water Exploitation Index (WEI+) calculated at annual and monthly scale (ETC/ICM, 2012); Standardized Precipitation Index (SPI); Standardized Runoff Index (SRI). The results confirmed the need for the analysis of the indicators different spatial and temporal scales to understand their meaning in the local regional context considered. It was clearly shown that sub-annual patterns of water availability and water use play a fundamental role in the indicators meaning, and should be considered in their operational application. References: IPCC, 2012 - Special Report on Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation, 2012 ETC/ICM, 2012 - Vulnerability to Water Scarcity and Drought in Europe - Background thematic report for EEA water 2012 report, EEA/NSV/10/002

Mazzanti, Bernardo; Checcucci, Gaia; Monacelli, Giuseppina; Puma, Francesco; Vezzani, Claudia

2013-04-01

447

The Application of Performance Assessment to Make Regulatory and Operational Changes in an Operating Nuclear Waste Repository  

Microsoft Academic Search

This paper describes how performance assessment (PA) is used to support changes to the regulatory basis of the Waste Isolation Pilot Plant (WIPP). The WIPP, located near Carlsbad, New Mexico is operated by the U.S. Department of Energy (DOE) as the nation's only deep geologic repository for the disposal of transuranic nuclear waste. In 1998, the Environmental Protection Agency (EPA)

R. Patterson; R. Kirkes

2008-01-01

448

NOAA Operational Model Archive Distribution System (NOMADS): High Availability Applications for Reliable Real Time Access to Operational Model Data  

Microsoft Academic Search

To reduce the impact of natural hazards and environmental changes, the National Centers for Environmental Prediction (NCEP) provide first alert and a preferred partner for environmental prediction services, and represents a critical national resource to operational and research communities affected by climate, weather and water. NOMADS is now delivering high availability services as part of NOAA's official real time data

J. C. Alpert; J. Wang

2009-01-01

449

The ambient media player: a media application remotely operated by the use of mobile devices and gestures  

Microsoft Academic Search

To utilize interactive multimedia applications in public and private environments for advertisement, entertainment and user guidance requires remote input capabilities. The use of mobile and handheld devices is a desirable option for implementation of user interaction with remote services from a distance. Another prominent option to operate a remote application is the use of gestures performed in the air. This

Andreas Lorenz; Marc Jentsch

2010-01-01

450

PbS Quantum Dots Embedded in a ZnS Dielectric Matrix for Bulk Heterojunction Solar Cell Applications.  

PubMed

We demonstrate a novel bulk heterojunction structure based on a mesoporous TiO2 substrate, PbS quantum dots (QDs), and a ZnS dielectric medium. The galena PbS QD arrays embedded in an amorphous ZnS matrix are adopted to fill up the mesoporous TiO2 electrode with an in situ approach, i.e., successive ionic layer adsorption and reaction. The inorganic ZnS resembles the capping material normally used in colloidal QDs to control the size of PbS. PMID:23824682

Sun, Lidong; Koh, Zhen Yu; Wang, Qing

2013-07-04

451

Analytical matrix elements of the Uehling potential in three-body systems and applications to exotic molecules  

NASA Astrophysics Data System (ADS)

Exact analytical expressions for the matrix elements of the Uehling potential in a basis of explicitly correlated exponential wave functions are presented. The obtained formulas are then used to compute with an improved accuracy the vacuum polarization correction to the binding energy of muonic and pionic molecules, both in a first-order perturbative treatment and in a nonperturbative approach. The first resonant states lying below the n=2 threshold are also studied, by means of the stabilization method with a real dilatation parameter.

Karr, Jean-Philippe; Hilico, Laurent

2013-01-01

452

Processing multiphoton states through operation on a single photon: Methods and applications  

SciTech Connect

Multiphoton states are widely applied in quantum information technology. By the methods presented in this paper, the structure of a multiphoton state in the form of multiple single-photon qubit products can be mapped to a single-photon qudit, which could also be in a separable product with other photons. This makes possible the manipulation of such multiphoton states by processing single-photon states. The optical realization of unknown qubit discrimination [B. He, J. A. Bergou, and Y.-H. Ren, Phys. Rev. A 76, 032301 (2007)] is simplified with the transformation methods. Another application is the construction of quantum logic gates, where the inverse transformations back to the input state spaces are also necessary. We especially show that the modified setups to implement the transformations can realize the deterministic multicontrol gates (including Toffoli gate) operating directly on the products of single-photon qubits.

Lin Qing [College of Information Science and Engineering, Huaqiao University (Xiamen), Xiamen 361021 (China); He Bing [Institute for Quantum Information Science, University of Calgary, Alberta, T2N 1N4 (Canada); Bergou, Janos A.; Ren, Yuhang [Department of Physics and Astronomy, Hunter College of the City University of New York, 695 Park Avenue, New York, New York 10065 (United States)

2009-10-15

453

Application of the Effective Operator Approach to the Calculation of12C16O2Line Intensities  

NASA Astrophysics Data System (ADS)

The effective operator approach has been applied to the calculation of line intensities of12C16O2. Using the eigenfunctions of our reduced effective Hamiltonian (1992,J. Mol. Spectrosc.156,48-64) the experimental line intensities of cold and hot bands lying in the regions of 15, 10, and 5 ?m have been fitted to parameters of the corresponding effective dipole moment matrix elements. The quality of fittings and the extrapolational properties of the fitted parameters are discussed. Formulas in terms of basic molecular properties for some of the parameters of the effective dipole moment matrix elements are derived. Values of these parameters calculated from the theoretical formulas using the force field and dipole moment expansions of Wattson and Rothman (1992,J. Quant. Spectrosc. Radiat. Transfer48,763-780) have been compared with corresponding fitted values.

Teffo, J.-L.; Lyulin, O. M.; Perevalov, V. I.; Lobodenko, E. I.

1998-01-01

454

Metal Matrix Composites  

SciTech Connect

Metal matrix composites have found selected application in areas that can cost-effectively capitalize on improvements in specific stiffness, specific strength, fatigue resistance, wear resistance, and coefficient of thermal expansion. Metal matrix composites comprise a relatively wide range of materials defined by the metal matrix, reinforcement type, and reinforcement geometry. In the area of the matrix, most metallic systems have been explored, including aluminum, beryllium, magnesium, titanium, iron, nickel, cobalt, and silver. However, aluminum is by far the most preferred. For reinforcements, the materials are typically ceramics, which provide a very beneficial combination of stiffness, strength, and relatively low density. Candidate reinforcement materials include SiC, Al2O3, B4C, TiC, TiB2, graphite, and a number of other ceramics. In addition, metallic materials such as tungsten and steel fibers have been considered.

Hunt, Warren; Herling, Darrell R.

2004-02-01

455

Application of a wireless sensor node to health monitoring of operational wind turbine blades  

SciTech Connect

Structural health monitoring (SHM) is a developing field of research with a variety of applications including civil structures, industrial equipment, and energy infrastructure. An SHM system requires an integrated process of sensing, data interrogation and statistical assessment. The first and most important stage of any SHM system is the sensing system, which is traditionally composed of transducers and data acquisition hardware. However, such hardware is often heavy, bulky, and difficult to install in situ. Furthermore, physical access to the structure being monitored may be limited or restricted, as is the case for rotating wind turbine blades or unmanned aerial vehicles, requiring wireless transmission of sensor readings. This study applies a previously developed compact wireless sensor node to structural health monitoring of rotating small-scale wind turbine blades. The compact sensor node collects low-frequency structural vibration measurements to estimate natural frequencies and operational deflection shapes. The sensor node also has the capability to perform high-frequency impedance measurements to detect changes in local material properties or other physical characteristics. Operational measurements were collected using the wireless sensing system for both healthy and damaged blade conditions. Damage sensitive features were extracted from the collected data, and those features were used to classify the structural condition as healthy or damaged.

Taylor, Stuart G [Los Alamos National Laboratory; Farinholt, Kevin M [Los Alamos National Laboratory; Park, Gyuhae [Los Alamos National Laboratory; Farrar, Charles R [Los Alamos National Laboratory; Todd, Michael D [UCSD

2009-01-01

456

Green's function, reproducing kernel and Galerkin's matrix for the exterior of an ellipsoid: Application in gravity field studies  

NASA Astrophysics Data System (ADS)

In gravity field studies the complex structure of the Earth's surface makes the solution of potential problems (typically for the exterior of the Earth) rather demanding. This equally concerns classical methods of potential theory as well as modern methods often based on a weak solution concept. Green's functions, integral kernels, reproducing kernels of the respective Hilbert spaces, kernels associated with the integral equation method, but also linear (e.g. Galerkin's) systems resulting from the use of direct methods are usually constructed for a solution domain of boundary that is slightly simplified in comparison with reality. The measure of this simplification has an essential impact on the convergence of iteration procedures applied in this connection. Very often a sphere is used, but it seems this is not an adequate choice for a global approach to the solution. In this paper an attempt is made to discuss an apparatus suitable for the determination of a harmonic function that meets a prescribed boundary condition on an ellipsoid of revolution. Ellipsoidal harmonics come into play. The structure of the kernels mentioned above similarly as of the entries of Galerkin's matrix becomes rather complex. Therefore, an approximation of ellipsoidal harmonics based on an approximation version of Legendre's ordinary differential equation, resulting from the method of separation of variables in solving Laplace's equation, is used. The idea is applied to the construction of Green's function, reproducing kernel and Galarkin's matrix with a particular view to potential problems in gravity field modeling.

Holota, Petr

2010-05-01

457

Synthesis and characterization of PVP-capped CdSe nanoparticles embedded in PVA matrix for photovoltaic application  

NASA Astrophysics Data System (ADS)

Polyvinyl pyrrolidone (PVP) capped cadmium selenide (CdSe) nanoparticles embedded in polyvinyl alcohol (PVA) matrix are reported. PVP-CdSe nanoparticles are prepared by a non-aqueous method wherein cadmium chloride is used as the cadmium source and sodium selenate as the selenium source. The nanocomposites are characterized by x-ray diffraction (XRD) and transmission electron microscopy (TEM) studies. XRD and TEM studies show the formation of cubic CdSe particles with an average size of 2.3 ± 0.2 nm. The synthesized nanoparticles are dispersed in the PVA matrix and cast as self-standing flexible (PVP-CdSe)-PVA films. These films are characterized by optical absorption spectroscopy, by which optical band energy gaps as well as the average particle size of CdSe nanoparticles were calculated. The I-V characteristic curve of the (PVP-CdSe)-PVA film shows a photovoltaic cell-like behaviour. The electromotive force generated from the (PVP-CdSe)-PVA film as a function of light intensity was also studied.

Mahmoud, Waleed E.; El-Mallah, H. M.

2009-02-01

458

A large-area, flexible pressure sensor matrix with organic field-effect transistors for artificial skin applications  

PubMed Central

It is now widely accepted that skin sensitivity will be very important for future robots used by humans in daily life for housekeeping and entertainment purposes. Despite this fact, relatively little progress has been made in the field of pressure recognition compared to the areas of sight and voice recognition, mainly because good artificial “electronic skin” with a large area and mechanical flexibility is not yet available. The fabrication of a sensitive skin consisting of thousands of pressure sensors would require a flexible switching matrix that cannot be realized with present silicon-based electronics. Organic field-effect transistors can substitute for such conventional electronics because organic circuits are inherently flexible and potentially ultralow in cost even for a large area. Thus, integration of organic transistors and rubber pressure sensors, both of which can be produced by low-cost processing technology such as large-area printing technology, will provide an ideal solution to realize a practical artificial skin, whose feasibility has been demonstrated in this paper. Pressure images have been taken by flexible active matrix drivers with organic transistors whose mobility reaches as high as 1.4 cm2/V·s. The device is electrically functional even when it is wrapped around a cylindrical bar with a 2-mm radius.

Someya, Takao; Sekitani, Tsuyoshi; Iba, Shingo; Kato, Yusaku; Kawaguchi, Hiroshi; Sakurai, Takayasu

2004-01-01

459

A matrix sensitive gas chromatography method for the analysis of pymetrozine in red pepper: Application to dissipation pattern and PHRL.  

PubMed

A gas chromatography (GC) method for the analysis of pymetrozine was developed after utilizing matrix enhancement effect of pymetrozine to nitrogen phosphorus detector (NPD). Samples were extracted with acetonitrile and purified through primary secondary amine (PSA) and C18 dispersive sorbent. Matrix-matched calibration curve prepared after spiking standard pymetrozine across the studied range of concentrations (0.003-1.0mg/L) into blank red pepper extract was excellent with a determination coefficients (R(2))=1. Recovery studies were carried out at three concentration levels (0.04, 0.4, and 2.0mg/kg, n=3) and the rates were ranged between 77.2% and 109.1%, with relative standard deviations ranged from 1.3% to 16.4%. The developed method was applied to field samples to characterize the dissipation pattern, half life, and pre-harvest residue limits (PHRL). The dissipation rates of the analyte were ascribed to first-order kinetics with half-life of 2.7 and 2.5days for recommended and double the recommended doses. From the PHRL curve, we could predict that if the residue level of pymetrozine is below the 1.23mg/kg at 10days or 0.71mg/kg at 7days before harvest, then the residues will be below the maximum residue limits (MRL=0.2mg/kg) established by the Korea Food and Drug Administration (KFDA). PMID:24176366

Jang, Jin; Rahman, Md Musfiqur; Ko, Ah-Young; Abd El-Aty, A M; Park, Jong-Hyouk; Cho, Soon-Kil; Shim, Jae-Han

2013-09-18

460

76 FR 9853 - Parts and Accessories Necessary for Safe Operation; Brakes; Application for Exemption From...  

Federal Register 2010, 2011, 2012, 2013

...Application for Exemption From Innovative Electronics; Correction AGENCY: Federal Motor...Application for Exemption From Innovative Electronics published in the Federal Register of...Application for Exemption From Innovative Electronics; Notice of application for...

2011-02-22

461

Operational climate monitoring from space: the EUMETSAT satellite application facility on climate monitoring (CM-SAF)  

NASA Astrophysics Data System (ADS)

The Satellite Application Facility on Climate Monitoring (CM-SAF) aims at the provision of satellite-derived geophysical parameter data sets suitable for climate monitoring. CM-SAF provides climatologies for Essential Climate Variables (ECV), as required by the Global Climate Observing System implementation plan in support of the UNFCCC. Several cloud parameters, surface albedo, radiation fluxes at the top of the atmosphere and at the surface as well as atmospheric temperature and humidity products form a sound basis for climate monitoring of the atmosphere. The products are categorized in monitoring data sets obtained in near real time and data sets based on carefully intercalibrated radiances. The CM-SAF products are derived from several instruments on-board operational satellites in geostationary and polar orbit, i.e., the Meteosat and NOAA satellites, respectively. The existing data sets will be continued using data from the instruments on-board the new EUMETSAT Meteorological Operational satellite (MetOP). The products have mostly been validated against several ground-based data sets both in situ and remotely sensed. The accomplished accuracy for products derived in near real time is sufficient to monitor variability on diurnal and seasonal scales. Products based on intercalibrated radiance data can also be used for climate variability analysis up to inter-annual scale. A central goal of the recently started Continuous Development and Operations Phase of the CM-SAF (2007-2012) is to further improve all CM-SAF data sets to a quality level that allows for studies of inter-annual variability.

Schulz, J.; Albert, P.; Behr, H.-D.; Caprion, D.; Deneke, H.; Dewitte, S.; Dürr, B.; Fuchs, P.; Gratzki, A.; Hechler, P.; Hollmann, R.; Johnston, S.; Karlsson, K.-G.; Manninen, T.; Müller, R.; Reuter, M.; Riihelä, A.; Roebeling, R.; Selbach, N.; Tetzlaff, A.; Thomas, W.; Werscheck, M.; Wolters, E.; Zelenka, A.

2008-05-01

462

Operational climate monitoring from space: the EUMETSAT Satellite Application Facility on Climate Monitoring (CM-SAF)  

NASA Astrophysics Data System (ADS)

The Satellite Application Facility on Climate Monitoring (CM-SAF) aims at the provision of satellite-derived geophysical parameter data sets suitable for climate monitoring. CM-SAF provides climatologies for Essential Climate Variables (ECV), as required by the Global Climate Observing System implementation plan in support of the UNFCCC. Several cloud parameters, surface albedo, radiation fluxes at the top of the atmosphere and at the surface as well as atmospheric temperature and humidity products form a sound basis for climate monitoring of the atmosphere. The products are categorized in monitoring data sets obtained in near real time and data sets based on carefully intercalibrated radiances. The CM-SAF products are derived from several instruments on-board operational satellites in geostationary and polar orbit as the Meteosat and NOAA satellites, respectively. The existing data sets will be continued using data from the instruments on-board the new joint NOAA/EUMETSAT Meteorological Operational Polar satellite. The products have mostly been validated against several ground-based data sets both in situ and remotely sensed. The accomplished accuracy for products derived in near real time is sufficient to monitor variability on diurnal and seasonal scales. The demands on accuracy increase the longer the considered time scale is. Thus, interannual variability or trends can only be assessed if the sensor data are corrected for jumps created by instrument changes on successive satellites and more subtle effects like instrument and orbit drift and also changes to the spectral response function of an instrument. Thus, a central goal of the recently started Continuous Development and Operations Phase of the CM-SAF (2007-2012) is to further improve all CM-SAF data products to a quality level that allows for studies of interannual variability.

Schulz, J.; Albert, P.; Behr, H.-D.; Caprion, D.; Deneke, H.; Dewitte, S.; Dürr, B.; Fuchs, P.; Gratzki, A.; Hechler, P.; Hollmann, R.; Johnston, S.; Karlsson, K.-G.; Manninen, T.; Müller, R.; Reuter, M.; Riihelä, A.; Roebeling, R.; Selbach, N.; Tetzlaff, A.; Thomas, W.; Werscheck, M.; Wolters, E.; Zelenka, A.

2009-03-01

463

Matrix Arithmetic  

NSDL National Science Digital Library

The purposes of this module are to experiment with matrix addition, subtraction, and (mostly) multiplication; to see that many familiar arithmetic properties of real numbers carry over to matrices, but some do not.

Blake, Lewis; Smith, David

1999-06-04

464

Matrix Metalloproteinases  

PubMed Central

The most common cause of failure of retinal reattachment surgery is formation of fibrocellular contractile membranes on both surfaces of the neuroretina. This intraocular fibrosis, known as proliferative vitreoretinopathy, results in a blinding tractional retinal detachment because of the contractile nature of the membrane. Contractility is a cell-mediated event that is thought to be dependent on locomotion and adhesion to the extracellular matrix. Interactions between cells and the extracellular matrix can be influenced by matrix metalloproteinases (MMPs) and we investigated the role of MMPs in two in vitro models (two- and three-dimensional) of human retinal pigment epithelial (RPE) cell-mediated contraction. MMP activity was detected using enzyme-linked immunosorbent assays and zymography techniques that revealed MMP-1, -2, -3, and -9 positivity during the collagen matrix contraction assays. RPE-populated collagen matrix contraction (three-dimensional) was inhibited using a cocktail of anti-MMP antibodies and with Galardin (a broad-spectrum MMP inhibitor). Galardin inhibition was dose-dependent, reversible, and dependent on cell number. MMP inhibitors had no effect on contraction when RPEs were seeded on two-dimensional collagen matrices or on cellular adhesion to collagen type I. Our results suggest that MMP activity may be required for three-dimensional but not two-dimensional RPE-collagen matrix contraction.

Sheridan, Carl M.; Occleston, Nick L.; Hiscott, Paul; Kon, Chee H.; Khaw, Peng T.; Grierson, Ian

2001-01-01

465

High Performance Linear Algebra Operations on Reconfigurable Systems  

Microsoft Academic Search

Field-Programmable Gate Arrays (FPGAs) have become an attractive option for scientific computing. Several vendors have developed high performance reconfigurable systems which employ FPGAs for application acceleration. In this paper, we propose a BLAS (Basic Linear Algebra Subprograms) library for state-of-the-art reconfigurable systems. We study three data-intensive operations: dot product, matrix-vector multiply and dense matrix multiply. The first two operations are

Ling Zhuo; Viktor K. Prasanna