These are representative sample records from Science.gov related to your search topic.
For comprehensive and current results, perform a real-time search at Science.gov.
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

Matrix Operations  

NSDL National Science Digital Library

Created by Lewis Blake and David Smith of the Connected Curriculum Project, the purposes of this module are to experiment with matrix operations, especially multiplication, inversion, and determinants, and to explore applications to solving systems of linear equations. In the process of studying these matrix operations, we will learn how to use a helper application to carry out matrix computations.

Blake, Lewis; Smith, David

2010-06-24

3

Matrix Operations  

NSDL National Science Digital Library

Created by Lewis Blake and David Smith for the Connected Curriculum Project, the purposes of this module are to experiment with matrix operations, espcially multiplication, inversion, and determinants, and to explore applications to solving systems of linear equations. In the process of studying these matrix operations, we will learn how to use a helper application to carry out matrix computations. This is one of a much larger set of learning modules hosted by Duke University.

Blake, Lewis; Smith, David

2010-04-29

4

General transfer matrix formalism to calculate DNA–protein–drug binding in gene regulation: application to OR operator of phage ?  

PubMed Central

The transfer matrix methodology is proposed as a systematic tool for the statistical–mechanical description of DNA–protein–drug binding involved in gene regulation. We show that a genetic system of several cis-regulatory modules is calculable using this method, considering explicitly the site-overlapping, competitive, cooperative binding of regulatory proteins, their multilayer assembly and DNA looping. In the methodological section, the matrix models are solved for the basic types of short- and long-range interactions between DNA-bound proteins, drugs and nucleosomes. We apply the matrix method to gene regulation at the OR operator of phage ?. The transfer matrix formalism allowed the description of the ?-switch at a single-nucleotide resolution, taking into account the effects of a range of inter-protein distances. Our calculations confirm previously established roles of the contact CI–Cro–RNAP interactions. Concerning long-range interactions, we show that while the DNA loop between the OR and OL operators is important at the lysogenic CI concentrations, the interference between the adjacent promoters PR and PRM becomes more important at small CI concentrations. A large change in the expression pattern may arise in this regime due to anticooperative interactions between DNA-bound RNA polymerases. The applicability of the matrix method to more complex systems is discussed. PMID:17526526

Teif, Vladimir B.

2007-01-01

5

The Social Fabric Matrix Approach to Central Bank Operations: An Application to the Federal Reserve and the Recent Financial Crisis  

Microsoft Academic Search

This chapter utilizes the social fabric matrix approach (SFM-A) to provide a detailed description of the Federal Reserve’s\\u000a (Fed’s) daily operations and the recent financial crisis. The SFM of the Fed’s operations presents the primary components\\u000a – major norms, institutions, technologies – relevant on a day-to-day basis. The SFM is then used for normative systems analysis\\u000a (Hayden 1998) to show

Scott T. Fullwiler

6

Modified engagement method for matrix operation  

NASA Astrophysics Data System (ADS)

We describe a modified engagement method for matrix operation based on a two-dimensional crossed-ring interconnection network. Our method incorporates fewer steps than that reported by Bocker et al. [Appl. Opt. 22, 804 (1983)], and its performance is found to be the most efficient (minimum steps) in comparison with other systolic and/or engagement methods for matrix operation. Thus, it may be helpful for other optical and electronic implementations of matrix operations. One compact optoelectronic integrity approach for implementing the modified engagement method is briefly described.

Zhou, Changhe; Liu, Liren; Li, Guoqiang; Ying, Yaozu

1995-11-01

7

Learned fusion operators based on matrix completion  

NASA Astrophysics Data System (ADS)

The efficient and timely management of imagery captured in the battlefield requires methods capable of searching the voluminous databases and extracting highly symbolic concepts. When processing images, a semantic and definition gap exists between machine representations and the user's language. Based on matrix completion techniques, we present a fusion operator that fuses imagery and expert knowledge provided by user inputs during post analysis. Specifically, an information matrix is formed from imagery and a class map as labeled by an expert. From this matrix an image operator is derived for the extraction/prediction of information from future imagery. We will present results using this technique on single mode data.

Risko, Kelly K. D.; Hester, Charles F.

2011-05-01

8

Operational Models Matrix: Characteristics of Operational NWP Models  

NSDL National Science Digital Library

Operational Models Matrix: 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. The subject matter expert for this module is Dr. Ralph Petersen of the National Centers for Environmental Prediction, Environmental Modeling Center (NCEP/EMC).

Comet

2007-10-19

9

THE MATRIX CUBE PROBLEM: Approximations and Applications  

E-print Network

THE MATRIX CUBE PROBLEM: Approximations and Applications Arkadi Nemirovski, Stieltjes Visiting with A. Ben-Tal 1. Matrix Cube � The problem: formulation and moti- vation � Main result � Back to applications � Sketch of the proof 2. From Matrix Cube to Computing Ma- trix Norms � The problem � Main result

Nemirovski, Arkadi

10

Random Matrix Theory and its Innovative Applications  

E-print Network

deep in the heart of nature." 1. Distinguishing "signal" from "noise": Generate a matrix of dataRandom Matrix Theory and its Innovative Applications Alan Edelman and Yuyang Wang Abstract Recently more and more disciplines of science and engineering have found Random Matrix Theory valuable. Some

Edelman, Alan

11

Crystal frameworks, matrix-valued functions and rigidity operators  

E-print Network

Crystal frameworks, matrix-valued functions and rigidity operators S.C. Power Abstract. An introduction and survey is given of some recent work on the infinitesimal dynamics of crystal frameworks operators, matrix-function representations and low energy phonons. These phonons in material crystals

Haase, Markus

12

Application of Fuzzy Logic to Matrix FMECA  

NASA Astrophysics Data System (ADS)

A methodology combining the benefits of Fuzzy Logic and Matrix FMEA is presented in this paper. The presented methodology extends the risk prioritization beyond the conventional Risk Priority Number (RPN) method. Fuzzy logic is used to calculate the criticality rank. Also the matrix approach is improved further to develop a pictorial representation retaining all relevant qualitative and quantitative information of several FMEA elements relationships. The methodology presented is demonstrated by application to an illustrative example.

Shankar, N. Ravi; Prabhu, B. S.

2001-04-01

13

Airspace Operations Demo Functional Requirements Matrix  

NASA Technical Reports Server (NTRS)

The Flight IPT assessed the reasonableness of demonstrating each of the Access 5 Step 1 functional requirements. The functional requirements listed in this matrix are from the September 2005 release of the Access 5 Functional Requirements Document. The demonstration mission considered was a notional Western US mission (WUS). The conclusion of the assessment is that 90% of the Access 5 Step 1 functional requirements can be demonstrated using the notional Western US mission.

2005-01-01

14

Nonnegative Matrix Factorization: Models, Algorithms and Applications  

E-print Network

]). In fact, in many applications such as image processing, biology or text mining, nonnegative data analysis. In recent years, Nonnegative Matrix Factorization (NMF) has become a popular model in data mining society conclusions: 1) NMF has a good interpretability due to its nonnegative constraints; 2) NMF is very flexible

Allen, Jont

15

Fault-Tolerant Matrix Operations On Multiple Processor Systems Using Weighted Checksums  

NASA Astrophysics Data System (ADS)

Hardware for performing matrix operations at high speeds is in great demand in signal and image processing and in many real-time and scientific applications. VLSI technology has made it possible to perform fast large-scale vector and matrix computations by using multiple copies of low-cost processors. Since any functional error in a high performance system may seriously jeopardize the operation of the system and its data integrity, some level of fault-tolerance must be obtained to ensure that the results of long computations are valid. A low-cost checksum scheme had been proposed to obtain fault-tolerant matrix operations on multiple processor systems. However, this scheme can only correct errors in matrix multiplication; it can detect, but not correct errors in matrix-vector multiplication, LU-decomposition, and matrix inversion. In order to solve these problems with the checksum scheme, a very general matrix encoding scheme is proposed in this paper to achieve fault-tolerant matrix operations with multiple processor systems. Since many signal and image processing algorithms involving a "multiply-and-accumulate" type of expression can be transformed into matrix-vector multiplication operations and executed in a linear array, this scheme is extremely useful for cost-effective and fault-tolerant signal and image processing.

Jou, Jing-Yang; Abraham, Jacob A.

1984-11-01

16

Airbreathing Hypersonic Vision-Operational-Vehicles Design Matrix  

NASA Technical Reports Server (NTRS)

This paper presents the status of the airbreathing hypersonic airplane and space-access vision-operational-vehicle design matrix, with emphasis on horizontal takeoff and landing systems being, studied at Langley, it reflects the synergies and issues, and indicates the thrust of the effort to resolve the design matrix including Mach 5 to 10 airplanes with global-reach potential, pop-up and dual-role transatmospheric vehicles and airbreathing launch systems. The convergence of several critical systems/technologies across the vehicle matrix is indicated. This is particularly true for the low speed propulsion system for large unassisted horizontal takeoff vehicles which favor turbines and/or perhaps pulse detonation engines that do not require LOX which imposes loading concerns and mission Flexibility restraints.

Hunt, James L.; Pegg, Robert J.; Petley, Dennis H.

1999-01-01

17

Airbreathing Hypersonic Vision-Operational-Vehicles Design Matrix  

NASA Technical Reports Server (NTRS)

This paper presents the status of the airbreathing hypersonic airplane and space-access vision-operational-vehicle design matrix, with emphasis on horizontal takeoff and landing systems being studied at Langley; it reflects the synergies and issues, and indicates the thrust of the effort to resolve the design matrix including Mach 5 to 10 airplanes with global-reach potential, pop-up and dual-role transatmospheric vehicles and airbreathing launch systems. The convergence of several critical systems/technologies across the vehicle matrix is indicated. This is particularly true for the low speed propulsion system for large unassisted horizontal takeoff vehicles which favor turbines and/or perhaps pulse detonation engines that do not require LOX which imposes loading concerns and mission flexibility restraints.

Hunt, James L.; Pegg, Robert J.; Petley, Dennis H.

1999-01-01

18

New fractional matrix with its applications in image encryption  

NASA Astrophysics Data System (ADS)

In this paper, new fractional matrix generation by using different the periodic matrix sequences are considered. For a periodic matrix with period P, its integer forms and fractional forms can constitute different periodic matrix sequences. The series of the periodic matrix sequence can be used to compute and construct different fractional matrices, which is depended on the relationship between the period and the size of the periodic matrix sequence. The proposed fractional matrix generation method is general and can be used to any periodic matrices. Then, we extend the new fractional matrices to multi-order forms, which can be used in image encryption. Simulation results and the application example in image encryption using the obtained new fractional matrix are also presented.

Zhang, Feng; Hu, Yang; Tao, Ran; Wang, Yue

2014-12-01

19

Boundary operator from matrix field formulation of boundary conditions for Friedrichs systems  

NASA Astrophysics Data System (ADS)

Following the recent progress in understanding the abstract setting for Friedrichs symmetric positive systems by Ern, Guermond and Caplain (2007) [8], as well as Antoni? and Burazin (2010) [3], an attempt is made to relate these results to the classical Friedrichs theory. A comparison of two approaches, via the trace operator and the boundary operator, has been made, favouring the latter. Finally, a particular set of sufficient conditions for a boundary matrix field to define a boundary operator in that case is given, and the applicability of this procedure in realistic situations is shown by examples.

Antoni?, Nenad; Burazin, Krešimir

20

Extreme ranks of a linear quaternion matrix expression subject to triple quaternion matrix equations with applications  

Microsoft Academic Search

In this paper, we establish the formulas of the maximal and minimal ranks of the quaternion matrix expression C4-A4XB4 where X is a variant quaternion matrix subject to quaternion matrix equations A1X=C1,XB2=C2,A3XB3=C3. As applications, we give a new necessary and sufficient condition for the existence of solutions to the system of matrix equations A1X=C1,XB2=C2,A3XB3=C3,A4XB4=C4, which was investigated by Wang [Q.W.

Qing-wen Wang; Shao-wen Yu; Chun-yan Lin

2008-01-01

21

HPRR operating experience and applications  

Microsoft Academic Search

The Health Physics Research Reactor (HPRR) is a small, unmoderated fast pulse reactor located at the Oak Ridge National Laboratory (ORNL). The HPRR is the principal research tool of ORNL's Dosimetry Applications Research (DOSAR) Group. The reactor is described, its operating experience is presented, and its major applications are discussed.

E. G. Bailiff; C. S. Sims; R. E. Swaja

1986-01-01

22

Handbook Article on Applications of Random Matrix Theory to QCD  

E-print Network

In this chapter of the Oxford Handbook of Random Matrix Theory we introduce chiral Random Matrix Theories with the global symmetries of QCD. In the microscopic domain, these theories reproduce the mass and chemical potential dependence of QCD. The main focus of this chapter is on the spectral properties of the QCD Dirac operator and relations between chiral Random Matrix Theories and chiral Lagrangians. Both spectra of the anti-hermitian Dirac operator and spectra of the nonhermitian Dirac operator at nonzero chemical potential are discussed.

J. J. M. Verbaarschot

2009-10-21

23

General linear codes for fault-tolerant matrix operations on processor arrays  

NASA Technical Reports Server (NTRS)

Various checksum codes have been suggested for fault-tolerant matrix computations on processor arrays. Use of these codes is limited due to potential roundoff and overflow errors. Numerical errors may also be misconstrued as errors due to physical faults in the system. In this a set of linear codes is identified which can be used for fault-tolerant matrix operations such as matrix addition, multiplication, transposition, and LU-decomposition, with minimum numerical error. Encoding schemes are given for some of the example codes which fall under the general set of codes. With the help of experiments, a rule of thumb for the selection of a particular code for a given application is derived.

Nair, V. S. S.; Abraham, J. A.

1988-01-01

24

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

25

Operating characteristics of a three-phase to single-phase matrix converter with hybrid control scheme of power compensation and modulation applied to gas engine cogeneration system  

Microsoft Academic Search

Operating characteristics of a three-phase to single-phase matrix converter applied to a gas engine cogeneration system is investigated in this paper. Application of the matrix converter can enhance efficiency of a synchronous generator and converter because it improves total power factor of the generator and reduce losses in the converter. This matrix converter has no dc link but a small

Yushi Miura; Tomofumi Amano; Toshifumi Ise

2011-01-01

26

Graphite fiber reinforced glass matrix composites for aerospace applications  

NASA Technical Reports Server (NTRS)

The graphite fiber reinforced glass matrix composite system is described. Although this composite is not yet a mature material, it possesses low density, attractive mechanical properties at elevated temperatures, and good environmental stability. Properties are reported for a borosilicate glass matrix unidirectionally reinforced with 60 volume percent HMS graphite fiber. The flexural strength and fatigue characteristics at room and elevated temperature, resistance to thermal cycling and continuous high temperature oxidation, and thermal expansion characteristics of the composite are reported. The properties of this new composite are compared to those of advanced resin and metal matrix composites showing that graphite fiber reinforced glass matrix composites are attractive for aerospace applications.

Prewo, K. M.; Bacon, J. F.; Dicus, D. L.

1979-01-01

27

Improved operation of a three phase matrix converter using simple modulation strategy  

Microsoft Academic Search

Present work relates to improved operation of a 3-phase matrix converter using simple modulation strategy. A simple approach for input displacement power factor control is described, which can make the matrix converter as a source or sink of controlled reactive power. Novel feature of this investigation is the study relating to parallel operation of two matrix converters, from the point

A. K. Rao; J. K. Chatterjee; Shankar Subramanian; V. Rajasekhar

2010-01-01

28

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

29

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

30

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

31

COMMERICAL MOTOR VEHICLE OPERATOR EMPLOYMENT APPLICATION SUPPLEMENT  

E-print Network

COMMERICAL MOTOR VEHICLE OPERATOR EMPLOYMENT APPLICATION SUPPLEMENT _________________________________________________________ Applicants for positions involving the operation of a commercial motor vehicle must comply with Title 49 CFR: _______________ Please list the following information for each unexpired commercial motor vehicle operator license

Pilyugin, Sergei S.

32

Real-number codes for fault-tolerant matrix operations on processor arrays  

NASA Technical Reports Server (NTRS)

A generalization of existing real number codes is proposed. It is proven that linearity is a necessary and sufficient condition for codes used for fault-tolerant matrix operations such as matrix addition, multiplication, transposition, and LU decomposition. It is also proven that for every linear code defined over a finite field, there exists a corresponding linear real-number code with similar error detecting capabilities. Encoding schemes are given for some of the example codes which fall under the general set of real-number codes. With the help of experiments, a rule is derived for the selection of a particular code for a given application. The performance overhead of fault tolerance schemes using the generalized encoding schemes is shown to be very low, and this is substantiated through simulation experiments.

Nair, V. S. S.; Abraham, Jacob A.

1990-01-01

33

The stochastic operator approach to random matrix theory  

E-print Network

Classical random matrix models are formed from dense matrices with Gaussian entries. Their eigenvalues have features that have been observed in combinatorics, statistical mechanics, quantum mechanics, and even the zeros ...

Sutton, Brian D. (Brian David)

2005-01-01

34

Matrix Manipulations by Computer: Direct Numerical Procedures for Basic Matrix Operations.  

National Technical Information Service (NTIS)

This paper describes a set of computer programs that develop a number of reasonably complex routines for determinant evaluation, solution of simultaneous equations, and matrix inversion; the programs are derived from a simple Gauss elimination technique f...

J. Staudhammer

1966-01-01

35

Relativistic matrix elements of the energy operator in the case of complex electronic configurations  

Microsoft Academic Search

The relativistic energy operator is considered. The expressions for the matrix elements of this operator in the case of complex electronic configurations (one and two subshells of equivalent electrons) are presented. The numerical values of the coefficients of the radial integrals in these matrix elements are tabulated. The tables contain all these coefficients in the case of configurations arising from

Z. B. Rudzikas; V. I. Sivcev; I. S. Kickin

1976-01-01

36

Polymer, metal and ceramic matrix composites for advanced aircraft engine applications  

NASA Technical Reports Server (NTRS)

Advanced aircraft engine research within NASA Lewis is being focused on propulsion systems for subsonic, supersonic, and hypersonic aircraft. Each of these flight regimes requires different types of engines, but all require advanced materials to meet their goals of performance, thrust-to-weight ratio, and fuel efficiency. The high strength/weight and stiffness/weight properties of resin, metal, and ceramic matrix composites will play an increasingly key role in meeting these performance requirements. At NASA Lewis, research is ongoing to apply graphite/polyimide composites to engine components and to develop polymer matrices with higher operating temperature capabilities. Metal matrix composites, using magnesium, aluminum, titanium, and superalloy matrices, are being developed for application to static and rotating engine components, as well as for space applications, over a broad temperature range. Ceramic matrix composites are also being examined to increase the toughness and reliability of ceramics for application to high-temperature engine structures and components.

Mcdanels, D. L.; Serafini, T. T.; Dicarlo, J. A.

1985-01-01

37

A matrix safety frame approach to robot safety for space applications. Thesis  

NASA Technical Reports Server (NTRS)

The planned use of autonomous robots in space applications has generated many new safety problems. This thesis assesses safety of autonomous robot systems through the structure of a proposed three-dimensional matrix safety frame. By identifying the common points of accidents and fatalities involving terrestrial robots, reviewing terrestrial robot safety standards, and modifying and extending these results to space applications, hazards are identified and their associated risks assessed. Three components of the safeguarding dimension of the matrix safety frame, safeguarding through design and operation for intrinsic safety, and incorporation of add-on safety systems are explained through examples for both terrestrial and space robots. A space robot hazard identification checklist, a qualitative tool for robot systems designers, is developed using the structure imparted by the matrix safety frame. The development of an expert system from the contents of the checklist is discussed.

Montgomery, T. D.; Lauderbaugh, L. Ken

1988-01-01

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

Matrix Elements and Operator Equivalents Connected with the Magnetic Properties of Rare Earth Ions  

Microsoft Academic Search

An account is given of the methods used to determine the matrix elements of crystal field potentials with particular reference to rare earth ions. Emphasis is laid on the importance of Wigner coefficients in such problems and the idea of using equivalent angular momentum operators is developed. For convenience in applying the results tables of matrix elements are included.

K W H Stevens; K. W. H

1952-01-01

40

Matrix product state applications for the ALPS project  

NASA Astrophysics Data System (ADS)

The density-matrix renormalization group method has become a standard computational approach to the low-energy physics as well as dynamics of low-dimensional quantum systems. In this paper, we present a new set of applications, available as part of the ALPS package, that provide an efficient and flexible implementation of these methods based on a matrix product state (MPS) representation. Our applications implement, within the same framework, algorithms to variationally find the ground state and low-lying excited states as well as simulate the time evolution of arbitrary one-dimensional and two-dimensional models. Implementing the conservation of quantum numbers for generic Abelian symmetries, we achieve performance competitive with the best codes in the community. Example results are provided for (i) a model of itinerant fermions in one dimension and (ii) a model of quantum magnetism.

Dolfi, Michele; Bauer, Bela; Keller, Sebastian; Kosenkov, Alexandr; Ewart, Timothée; Kantian, Adrian; Giamarchi, Thierry; Troyer, Matthias

2014-12-01

41

Physics 116A Winter 2011 Elementary row operations and some applications  

E-print Network

Physics 116A Winter 2011 Elementary row operations and some applications 1. Elementary row operations Given an N Ã? N matrix A, we can perform various operations that modify some of the rows of A. There are three classes of elementary row operations, which we shall denote using the following notation: 1. Rj

California at Santa Cruz, University of

42

Physics 116A Winter 2011 Elementary row operations and some applications  

E-print Network

Physics 116A Winter 2011 Elementary row operations and some applications 1. Elementary row operations Given an N Ã?N matrix A, we can perform various operations that modify some of the rows of A. There are three classes of elementary row operations, which we shall denote using the following notation: 1. R j

California at Santa Cruz, University of

43

Inverse scattering for the matrix Schroedinger operator and Schroedinger operator on graphs with general self-adjoint boundary conditions  

E-print Network

Using a parameterisation of general self-adjoint boundary conditions in terms of Lagrange planes we propose a scheme for factorising the matrix Schroedinger operator and hence construct a Darboux transformation an interesting feature of which is that the matrix potential and boundary conditions are altered under the transformation. We present a solution of the inverse problem in the case of general boundary conditions using a Marchenko equation and discusss the specialisation to the case of graph with trivial compact part, ie. diagonal matrix potential.

M. Harmer

2007-03-01

44

Matrix fatigue cracking in {alpha}{sub 2} titanium matrix composites for hypersonic applications  

SciTech Connect

The objective of this work was to understand matrix cracking mechanisms in a unidirectional {alpha}{sub 2} titanium matrix composite (TMC) in possible hypersonic applications. A [0]{sub 8} SCS-6/Ti-24Al-11Nb (atomic %) TMC was first subjected to a variety of simple isothermal and nonisothermal fatigue cycles to evaluate the damage mechanisms in simple conditions. A modified ascent mission cycle test was then performed to evaluate the combined effects of loading modes. This cycle mixes mechanical cycling at 150 and 483 C, sustained loads, and a slow thermal cycle to 815 C. At low cyclic stresses and strains more common in hypersonic applications, environment-assisted surface cracking limited fatigue resistance. This damage mechanism was most acute for out-of-phase nonisothermal cycles having extended cycle periods and the ascent mission cycle. A simple linear fraction damage model was employed to help understand this damage mechanism. Time-dependent environmental damage was found to strongly influence out-of-phase and mission life, with mechanical cycling damage due to the combination of external loading and CTE mismatch stresses playing a smaller role. The mechanical cycling and sustained loads in the mission cycle also had a smaller role.

Gabb, T.P.; Gayda, J. [NASA Lewis Research Center, Cleveland, OH (United States)

1996-12-31

45

Optimal real number codes for fault tolerant matrix operations  

Microsoft Academic Search

Today s long running high performance computing applica- tions typically tolerate fail-stop failures by checkpointing. However, applications such as dense linear algebra com- putations often modify a large mount of memory between checkpoints and checkpointing usually introduces consider- able overhead when the number of processors used for com- putation is large. It has been demonstrated in (13) that single fail-stop

Zizhong Chen

2009-01-01

46

Advanced Ceramic Matrix Composites (CMCs) for High Temperature Applications  

NASA Technical Reports Server (NTRS)

Advanced ceramic matrix composites (CMCs) are enabling materials for a number of demanding applications in aerospace, energy, and nuclear industries. In the aerospace systems, these materials are being considered for applications in hot sections of jet engines such as the combustor liner, vanes, nozzle components, nose cones, leading edges of reentry vehicles, and space propulsion components. Applications in the energy and environmental industries include radiant heater tubes, heat exchangers, heat recuperators, gas and diesel particulate filters, and components for land based turbines for power generation. These materials are also being considered for use in the first wall and blanket components of fusion reactors. In the last few years, a number of CMC components have been developed and successfully tested for various aerospace and ground based applications. However, a number of challenges still remain slowing the wide scale implementation of these materials. They include robust fabrication and manufacturing, assembly and integration, coatings, property modeling and life prediction, design codes and databases, repair and refurbishment, and cost. Fabrication of net and complex shape components with high density and tailorable matrix properties is quite expensive, and even then various desirable properties are not achievable. In this presentation, a number of examples of successful CMC component development and testing will be provided. In addition, critical need for robust manufacturing, joining and assembly technologies in successful implementation of these systems will be discussed.

Singh, M.

2005-01-01

47

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

48

Properties and applications of transversal operators  

E-print Network

This paper presents some properties and applications of "transversal operators". Two transversal operators are presented: a "translation" operator T and a "dilation" operator D. Such operators are used in common analysis systems including Fourier series analysis, Fourier analysis, Gabor analysis, multiresolution analysis (MRA), and wavelet analysis. Like the unitary Fourier transform operator F, the transversal operators T and D are unitary. Demonstrations of the usefulness of these three unitary operators are found in the proofs of results found in some common analytic systems including MRA analysis and wavelet analysis.

Daniel J. Greenhoe

2014-10-20

49

Carbon matrix based magnetic nanocomposites for potential biomedical applications.  

PubMed

It was found that by varying the pyrolysis temperature of the polymeric precursor, carbon matrix magnetic nanocomposites with different constitution and fractions of magnetic component were made. X-ray diffraction, transmission electron microscopy and Raman spectroscopy revealed the presence of nanocrystallites (NCs) of Co, Fe3C and Ni embedded in porous, partially-graphitized carbon matrix. Vibrating sample magnetometer measurements enabled to determine the correlation between NCs size distribution and magnetic properties. The magnetic studies confirmed that the coercivity, saturation and remanent magnetizations, as well as fraction of the magnetic component depend on the pyrolysis temperature. The Co#C and Fe3C#C composites exhibited ferromagnetic behavior with a remanent to saturation magnetization (M(R)/M(S)) ratio ranging from 0.25 to 0.3, whereas in the Ni containing samples a relatively small M(R)/M(S) ratio point to significant contribution of superparamagnetic interactions. As the carbon matrix magnetic nanocomposites are proposed for biomedical application the basic cytotoxicity test were performed to evaluate a potential toxic effect of the materials on MG-63 cells line. PMID:24745221

Izydorzak-Wozniak, M; Leonowicz, M

2014-03-01

50

Erosion Resistant Coatings for Polymer Matrix Composites in Propulsion Applications  

NASA Technical Reports Server (NTRS)

Polymer Matrix Composites (PMCs) offer lightweight and frequently low cost alternatives to other materials in many applications. High temperature PMCs are currently used in limited propulsion applications replacing metals. Yet in most cases, PMC propulsion applications are not in the direct engine flow path since particulate erosion degrades PMC component performance and therefore restricts their use in gas turbine engines. This paper compares two erosion resistant coatings (SANRES and SANPRES) on PMCs that are useful for both low and high temperature propulsion applications. Collaborating over a multi-year period, researchers at NASA Glenn Research Center, Allison Advanced Developed Company, and Rolls-Royce Corporation have optimized these coatings in terms of adhesion, surface roughness, and erosion resistance. Results are described for vigorous hot gas/particulate erosion rig and engine testing of uncoated and coated PMC fan bypass vanes from the AE 3007 regional jet gas turbine engine. Moreover, the structural durability of these coatings is described in long-term high cycle fatigue tests. Overall, both coatings performed well in all tests and will be considered for applications in both commercial and defense propulsion applications.

Sutter, James K.; Naik, Subhash K.; Horan, Richard; Miyoshi, Kazuhisa; Bowman, Cheryl; Ma, Kong; Leissler, George; Sinatra, Raymond; Cupp, Randall

2003-01-01

51

Two-loop QED Operator Matrix Elements with Massive External Fermion Lines  

E-print Network

The two-loop massive operator matrix elements for the fermionic local twist--2 operators with external massive fermion lines in Quantum Electrodynamics (QED) are calculated up to the constant terms in the dimensional parameter $\\epsilon = D - 4$. We investigate the hypothesis of Ref. \\cite{BBN} that the 2--loop QED initial state corrections to $e^+e^-$ annihilation into a virtual neutral gauge boson, except power corrections of $O((m_f^2/s)^k), k \\geq 1$, can be represented in terms of these matrix elements and the massless 2-loop Wilson coefficients of the Drell-Yan process.

Blümlein, Johannes; van Neerven, Wilhelmus

2011-01-01

52

Nondestructive Damage Evaluation in Ceramic Matrix Composites for Aerospace Applications  

PubMed Central

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.

2013-01-01

53

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

2013-01-01

54

Dry borax applicator operator's manual.  

SciTech Connect

Annosum root rot affects conifers throughout the Northern Hemisphere, infecting their roots and eventually killing the trees. The fungus Heterobasidion annosum causes annosum root rot. The fungus colonizes readily on freshly cut stumps. Partially cut stands have a high risk of infestation because the fungus can colonize on each of the stumps and potentially infect the neighboring trees. Wind and rain carry the annosum spores. Spores that land on freshly cut stumps grow down the stump's root system where they can infect living trees through root grafts or root contacts. Once annosum becomes established, it can remain active for many years in the Southern United States and for several decades in the north. About 7% of the trees that become infected die. When thinning, stumps can be treated successfully using a competing fungus, Phlebia gigantea, and with ''Tim-Bor'' in liquid formulations. These liquid products are no longer approved in the United States. Only the dry powder form is registered and approved by the EPA. Stumps can be treated with a dry formula of borax, (Sporax), significantly reducing one of the primary routes by which Heterobasidion annosum infects a stand of trees. Sporax is used by the USDA Forest Service to control annosum root rot. Sporax is now applied by hand, but once the felled trees are skidded it becomes very hard to locate the stumps. A stump applicator will reduce error, labor costs, and hazards to workers.

Karsky, Richard, J.

1999-01-01

55

WATER DISTRIBUTION SYSTEM OPERATION: APPLICATION OF  

E-print Network

CHAPTER 5 WATER DISTRIBUTION SYSTEM OPERATION: APPLICATION OF SIMULATED ANNEALING Fred E. Goldman Arizona State University, Tempe, Arizona 5.1 INTRODUCTION The operation of water distribution systems affects the water quality in these systems. EPA regulations require that water quality be maintained

Mays, Larry W.

56

Optical matrix processors  

NASA Astrophysics Data System (ADS)

The optical implementation of matrix-algebra operations is examined in an analytical review. Analog procedures for basic operations such as scalar-vector multiplication, inner and outer vector products, and vector-matrix and matrix-matrix multiplication are explained; the computational throughput for these operations is analyzed; digital encoding techniques to improve the accuracy of the operations are discussed; and higher-order operations such as L-U decomposition and Gram-Schmidt orthogonalization are considered. Image-processing and pattern-recognition applications (transformation, data compression, feature extraction, and image synthesis) are briefly characterized.

Athale, Ravindra A.

57

Advanced mutation operators applicable in C# programs  

Microsoft Academic Search

This paper is devoted to advanced mutation operators for C# source code. They deal with object-oriented (OO mutations) and\\u000a other complex features of the code. They require structural information about a code, unlike the standard mutations. Applicability\\u000a of OO operators in C# is compared with those for other OO languages. Operators for specific features of C# language are also\\u000a proposed.

Anna Derezinska

2006-01-01

58

The operation stability of a three-phase matrix-type SFCL against break-down of superconducting elements  

NASA Astrophysics Data System (ADS)

When the fault occurred in the power system, the superconducting fault current limiter (SFCL) rapidly limited the fault current to protect the power devices with preventing power failure. Therefore, the application of the matrix-type SFCL in the power system could improve of its reliability and stability. To apply the SFCL into the real power system, many superconducting elements should be connected in series and parallel. If any superconducting element of the matrix-type SFCL breaks down, it cannot basically limit the fault current. In this paper, we analyzed operation stability of the matrix-type SFCL which was divided into trigger and current-limiting parts as follows: Case 1. Break-down of a superconducting element in the trigger part. Case 2. Break-down of a superconducting element in the current-limiting part. Case 3. Break-down of two superconducting elements in the current-limiting part. When any superconducting element was broken down, we confirmed that all fault current flowed into other normal superconducting element connected in parallel and its power burden was largely increased. At that time, the matrix-type SFCL was operated well to limit the fault, but the fault current was decreased a little bit because the resistance generated in the superconducting element was abruptly increased. If the excessive current of the superconducting element exceeds its capacity, it could cause the break-down of the other superconducting element, shunt resistors, or shunt reactors, and then the break-down could be extended to the whole matrix-type SFCL. Through these results, we found that the number of superconducting elements connected in series and parallel should be designed with enough margins against the break-down of superconducting elements and optimal conditions for shunt resistors and reactors should be determined.

Jung, B. I.; Cho, Y. S.; Choi, H. S.; Chul, D. C.

2010-11-01

59

Numerical solution of an integral equations system of the first kind by using an operational matrix with block pulse functions  

Microsoft Academic Search

This article proposes a simple efficient method for solving a Volterra integral equations system of the first kind. By using block pulse functions and their operational matrix of integration, a first kind integral equations system can be reduced to a linear system of algebraic equations. The coefficient matrix of this system is a block matrix with lower triangular blocks. Numerical

Khosrow Maleknejad; Hamid Safdari; Mostafa Nouri

2011-01-01

60

On the matrix elements of dB=0 operators in the heavy meson decay widths  

E-print Network

We determine the chiral corrections to the matrix elements of the Delta B=0 four-quark operators which are relevant to the studies of the ratios of lifetimes of heavy-light mesons as well as to the power corrections to the inclusive semileptonic heavy-to-light decays. The chiral logarithmic corrections computed here can be combined with the forthcoming estimates of the corresponding matrix elements on the lattice to provide the reliable physics result of the well known bag-parameters B_(1,2) and epsilon_(1,2).

Damir Becirevic; Svjetlana Fajfer; Jernej F. Kamenik

2008-04-10

61

Matrix converter fed open-ended power electronic transformer for power system application  

Microsoft Academic Search

A matrix converter controlled 3-phase power electronics transformer is proposed for power system application. The proposed system uses three matrix converters and a three phase high frequency transformer in order to achieve isolation and, voltage and current transformation from primary to secondary. The primary side of the transformer is open-ended and two matrix converters connected to both sides of the

K. K. Mohapatra; Ned Mohan

2008-01-01

62

Compiling Parallel Code for Sparse Matrix Applications Vladimir Kotlyar Keshav Pingali Paul Stodghill  

E-print Network

matrix. In this paper, we show how this framework can be used to generate parallel code, and presentCompiling Parallel Code for Sparse Matrix Applications Vladimir Kotlyar Keshav Pingali Paul efficient sparse matrix code from dense DO­ANY loops and a specification of the representation of the sparse

Stodghill, Paul

63

Compiling Parallel Code for Sparse Matrix Applications Vladimir Kotlyar Keshav Pingali Paul Stodghill  

E-print Network

Compiling Parallel Code for Sparse Matrix Applications Vladimir Kotlyar Keshav Pingali Paul sparse matrix code from dense DO-ANY loops and a speci cation of the representation of the sparse matrix. In this paper, we show how this framework can be used to generate parallel code, and present experimental data

Pingali, Keshav K.

64

A note on the maximization of matrix valued Hankel determinants with applications  

NASA Astrophysics Data System (ADS)

In this note, we consider the problem of maximizing the determinant of moment matrices of matrix measures. The maximizing matrix measure can be characterized explicitly by having equal (matrix valued) weights at the zeros of classical (one-dimensional) orthogonal polynomials. The results generalize classical work of Schoenberg (Indag. Math. 62 (1959) 282) to the case of matrix measures. As a statistical application we consider several optimal design problems in linear models, which generalize the classical weighing design problems.

Dette, Holger; Studden, W. J.

2005-05-01

65

Fission matrix capability for MCNP, Part II - Applications  

SciTech Connect

This paper describes the initial experience and results from implementing a fission matrix capability into the MCNP Monte Carlo code. The fission matrix is obtained at essentially no cost during the normal simulation for criticality calculations. It can be used to provide estimates of the fundamental mode power distribution, the reactor dominance ratio, the eigenvalue spectrum, and higher mode spatial eigenfunctions. It can also be used to accelerate the convergence of the power method iterations. Past difficulties and limitations of the fission matrix approach are overcome with a new sparse representation of the matrix, permitting much larger and more accurate fission matrix representations. Numerous examples are presented. A companion paper (Part I - Theory) describes the theoretical basis for the fission matrix method. (authors)

Carney, S. E. [University of Michigan, NERS Department, 2355 Bonisteel Boulevard, Ann Arbor, MI 48109 (United States); Brown, F. B. [Los Alamos National Laboratory, Monte Carlo Codes Group, MS A143, PO Box 1663, Los Alamos, NM 87545 (United States); Kiedrowski, B. C. [University of Michigan, NERS Department, 2355 Bonisteel Boulevard, Ann Arbor, MI 48109 (United States); Martin, W. R. [Los Alamos National Laboratory, Monte Carlo Codes Group, MS A143, PO Box 1663, Los Alamos, NM 87545 (United States)

2013-07-01

66

A direct method to solve integral and integro-differential equations of convolution type by using improved operational matrix  

Microsoft Academic Search

In this article, we use improved operational matrix of block pulse functions on interval [0,?1) to solve Volterra integral and integro-differential equations of convolution type without solving any system and projection method. We first obtain Laplace transform of the problem and then we find numerical inversion of Laplace transform by improved operational matrix of integration. Numerical examples show that the

K. Maleknejad; M. Nouri

2012-01-01

67

Matrix-Product Operators and States: NP-Hardness and Undecidability  

NASA Astrophysics Data System (ADS)

Tensor network states constitute an important variational set of quantum states for numerical studies of strongly correlated systems in condensed-matter physics, as well as in mathematical physics. This is specifically true for finitely correlated states or matrix-product operators, designed to capture mixed states of one-dimensional quantum systems. It is a well-known open problem to find an efficient algorithm that decides whether a given matrix-product operator actually represents a physical state that in particular has no negative eigenvalues. We address and answer this question by showing that the problem is provably undecidable in the thermodynamic limit and that the bounded version of the problem is NP-hard (nondeterministic-polynomial-time hard) in the system size. Furthermore, we discuss numerous connections between tensor network methods and (seemingly) different concepts treated before in the literature, such as hidden Markov models and tensor trains.

Kliesch, M.; Gross, D.; Eisert, J.

2014-10-01

68

Matrix-Product Operators and States: NP-Hardness and Undecidability.  

PubMed

Tensor network states constitute an important variational set of quantum states for numerical studies of strongly correlated systems in condensed-matter physics, as well as in mathematical physics. This is specifically true for finitely correlated states or matrix-product operators, designed to capture mixed states of one-dimensional quantum systems. It is a well-known open problem to find an efficient algorithm that decides whether a given matrix-product operator actually represents a physical state that in particular has no negative eigenvalues. We address and answer this question by showing that the problem is provably undecidable in the thermodynamic limit and that the bounded version of the problem is NP-hard (nondeterministic-polynomial-time hard) in the system size. Furthermore, we discuss numerous connections between tensor network methods and (seemingly) different concepts treated before in the literature, such as hidden Markov models and tensor trains. PMID:25361243

Kliesch, M; Gross, D; Eisert, J

2014-10-17

69

The Matrix Elements of Tensor Operators for the Electronic Configurations fn  

Microsoft Academic Search

It is shown that many simple relations exist between various reduced matrix elements of the form (fn WUSL || Uk || fnW'U'SL'), where W = (w1w2w3) and U = (u1u2) are irreducible representations of R7 and G2 respectively. This is done by using the fact that for k = 2, 4 and 6, the components Uqk of the tensor operators

B R Judd

1959-01-01

70

An SVD-like matrix decomposition and its applications  

E-print Network

*(iJ)y. In this paper we provide several matrix factorizations related to symplectic matrices. We introduce a singular value-like decomposition B = QDS(-1) for any real matrix B is an element of R-n x 2m, where Q is real orthogonal, S is real symplectic, and D...

Xu, Hongguo

2003-07-15

71

The bladder extracellular matrix. Part II: regenerative applications  

Microsoft Academic Search

Bladder regeneration is a long-sought goal that could provide alternatives to cystoplasty using non-urological tissues. Regeneration might be achieved in different ways, such as seeding matrices with stem cells or conventional cells, or repopulation of the matrix by the body's own reservoir of cells. Consideration of how the extracellular matrix directs cell behavior will be crucial to the success of

Karen J. Aitken; Darius J. Bägli

2009-01-01

72

Theory and application of radiation boundary operators  

NASA Technical Reports Server (NTRS)

A succinct unified review is provided of the theory of radiation boundary operators. With the recent introduction of the on-surface radiation condition (OSRC) method and the continued growth of finite-difference and finite-element techniques for modeling electromagnetic wave scattering problems, the understanding and use of radiation boundary operators has become increasingly important. Results are presented to illustrate the application of radiation boundary operators in both these areas. Recent OSRC results include analysis of the scattering behavior of both electrically small and large cylinders, a reactively loaded acoustic sphere, and a simple reentrant duct. Radiation boundary operator results include the demonstration of the effectiveness of higher-order operators in truncating finite-difference time-domain grids.

Moore, Thomas G.; Kriegsmann, Gregory A.; Taflove, Allen; Blaschak, Jeffrey G.

1988-01-01

73

Extremal ranks of a quaternion matrix expression subject to consistent systems of quaternion matrix equations with applications  

Microsoft Academic Search

Assume that the linear quaternion matrix expression f(X1,X2)=A?A3X1B3?A4X2B4 where X1, X2 are variant quaternion matrices. In this paper, we derive the maximal and minimal ranks of f(X1,X2) subject to consistent systems of quaternion matrix equations A1X1=C1, X1B1=C2 and A2X2=C3, X2B2=C4. Moreover, corresponding results on some special cases are presented. As applications, we give necessary and sufficient conditions for the existence

Qing-wen Wang; Zhong-cheng Wu; Chun-yan Lin

2006-01-01

74

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

75

Low-lying Dirac operator eigenvalues, lattice effects and random matrix theory  

E-print Network

Recently, random matrix theory predictions for the distribution of low-lying Dirac operator eigenvalues have been extended to include lattice effects for both staggered and Wilson fermions. We computed low-lying eigenvalues for the Hermitian Wilson-Dirac operator and for improved staggered fermions on several quenched ensembles with size $\\approx 1.5$ fm. Comparisons to the expectations from RMT with lattice effects included are made. Wilson RMT describes our Wilson data nicely. For improved staggered fermions we find strong indications that taste breaking effects on the low-lying spectrum disappear in the continuum limit, as expected from staggered RMT.

Urs M. Heller

2011-12-08

76

Closed formula for the matrix elements of the volume operator in canonical quantum gravity  

NASA Astrophysics Data System (ADS)

We derive a closed formula for the matrix elements of the volume operator for canonical Lorentzian quantum gravity in four space-time dimensions in the continuum in a spin-network basis. We also display a new technique of regularization which is state dependent but we are forced to it in order to maintain diffeomorphism covariance and in that sense it is natural. We arrive naturally at the expression for the volume operator as defined by Ashtekar and Lewandowski up to a state-independent factor.

Thiemann, T.

1998-06-01

77

Closed formula for the matrix elements of the volume operator in canonical quantum gravity  

E-print Network

We derive a closed formula for the matrix elements of the volume operator for canonical Lorentzian quantum gravity in four spacetime dimensions in the continuum in a spin-network basis. We also display a new technique of regularization which is state dependent but we are forced to it in order to maintain diffeomorphism covariance and in that sense it is natural. We arrive naturally at the expression for the volume operator as defined by Ashtekar and Lewandowski up to a state independent factor.

T. Thiemann

1996-06-29

78

The application of the transfer matrix and matrix condensation methods with finite elements to duct acoustics  

Microsoft Academic Search

When making an acoustic finite element model of a duct system, the resulting matrices can be very large due to the length of ductwork, the complex changes in geometry and the numerous junctions, and a full model may require several thousand nodes. In this paper two techniques are given for reducing the size of the matrices; the transfer matrix method

A. Craggs

1989-01-01

79

Theoretical uncertainties in the nuclear matrix elements of neutrinoless double beta decay: The transition operator  

SciTech Connect

We explore the theoretical uncertainties related to the transition operator of neutrinoless double-beta (0???) decay. The transition operator used in standard calculations is a product of one-body currents, that can be obtained phenomenologically as in Tomoda [1] or Šimkovic et al. [2]. However, corrections to the operator are hard to obtain in the phenomenological approach. Instead, we calculate the 0??? decay operator in the framework of chiral effective theory (EFT), which gives a systematic order-by-order expansion of the transition currents. At leading orders in chiral EFT we reproduce the standard one-body currents of Refs. [1] and [2]. Corrections appear as two-body (2b) currents predicted by chiral EFT. We compute the effects of the leading 2b currents to the nuclear matrix elements of 0??? decay for several transition candidates. The 2b current contributions are related to the quenching of Gamow-Teller transitions found in nuclear structure calculations.

Menéndez, Javier [Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt (Germany)

2013-12-30

80

GC/matrix isolation/FTIR applications: analysis of PCBs  

SciTech Connect

High resolution capillary gas chromatography, coupled with the superior infrared spectra produced by matrix isolation FTIR, yields a powerful analytical tool which is applied to the analysis of polychlorinated biphenyls (PCBs). PCB congeners are identified in a commercially produced mixture (Aroclor 1221) using the matrix-isolated infrared spectra obtained by this method. The gas chromatograph/matrix isolation/Fourier transform infrared (GC/MI/FTIR) instrument utilized was developed at Argonne National Laboratory. GC/MI/FTIR is especially useful in the determination of PCBs in samples where the Aroclor pattern is not present.

Schneider, J.F.; Reedy, G.T.; Ettinger, D.G.

1985-02-01

81

Ab Initio MCSM Calculation for Reduced Matrix Elements of E2 Operator for A = 10 Nuclei  

NASA Astrophysics Data System (ADS)

The reduced matrix elements of Ê2 operator for 10Be low-lying states are evaluated with the no-core Monte Carlo shell model, which has been used to investigate the structure of light nuclei in an ab initio sense recently. The MCSM calculation converges within 20 MCSM dimensions. These MCSM results show good agreement with new experimental data and other ab initio calculations. The reduced matrix elements are investigated in terms of single-particle orbits contribution. It is found that the transition among p-shell orbits is dominant. The triaxial deformation of 10Be, as well as its mirror nucleus 10C, is also discussed. Meanwhile, the importance of p-shell orbits to the triaxiality is addressed.

Liu, Lang

2014-08-01

82

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

83

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

84

Application of the R-matrix method to photoionization of molecules  

Microsoft Academic Search

The R-matrix method has been used for theoretical calculation of electron collision with atoms and molecules for long years. The method was also formulated to treat photoionization process, however, its application has been mostly limited to photoionization of atoms. In this work, we implement the R-matrix method to treat molecular photoionization problem based on the UK R-matrix codes. This method

Motomichi Tashiro

2010-01-01

85

Glueball matrix elements: a lattice calculation and applications  

E-print Network

We compute the matrix elements of the energy-momentum tensor between glueball states and the vacuum in SU(3) lattice gauge theory and extrapolate them to the continuum. These matrix elements may play an important phenomenological role in identifying glue-rich mesons. Based on a relation derived long ago by the ITEP group for J/psi radiative decays, the scalar matrix element leads to a branching ratio for the glueball that is at least three times larger than the experimentally observed branching ratio for the f_0 mesons above 1GeV. This suggests that the glueball component must be diluted quite strongly among the known scalar mesons. Finally we review the current best continuum determination of the scalar and tensor glueball masses, the deconfining temperature, the string tension and the Lambda parameter, all in units of the Sommer reference scale, using calculations based on the Wilson action.

Harvey B. Meyer

2008-08-22

86

Solutions of the equation of radiative transfer by matrix operator techniques  

E-print Network

and the method of calcu- lation are discussed. Matrix operator theory is used to calculate the reflected and transmitted radiance of photons for the cases of Rayleigh scattering from a homogeneous layer and of plane parallel iv maritime haze layers... is more marked and the relative limb darkening under very thick layers is greater for haze 1i than for Rayleigh scattering. The downward diffuse flux at the lower boundary for A = 0 is always greater and the cloud al- bedo is always less for haze ll...

Catchings, Frances Eugenia King

2012-06-07

87

Application of the Transmission Line Matrix method for outdoor sound propagation modelling Part 1: Model  

E-print Network

Application of the Transmission Line Matrix method for outdoor sound propagation modelling ­ Part 1 applied to outdoor sound propagation under meteorological effects. The Transmission Line Matrix method propagation 1. Introduction Many numerical models have been developed in order to simulate me- teorological

Paris-Sud XI, Université de

88

Matrix elements of $\\Delta B=0$ operators in heavy hadron chiral perturbation theory  

E-print Network

We study the light-quark mass and spatial volume dependence of the matrix elements of $\\Delta B=0$ four-quark operators relevant for the determination of $V_{ub}$ and the lifetime ratios of single-$b$ hadrons. To this end, one-loop diagrams are computed in the framework of heavy hadron chiral perturbation theory with partially quenched formalism for three light-quark flavors in the isospin limit; flavor-connected and -disconnected diagrams are carefully analyzed. These calculations include the leading light-quark flavor and heavy-quark spin symmetry breaking effects in the heavy hadron spectrum. Our results can be used in the chiral extrapolation of lattice calculations of the matrix elements to the physical light-quark masses and to infinite volume. To provide insight on such chiral extrapolation, we evaluate the one-loop contributions to the matrix elements containing external $B_d$, $B_s$ mesons and $\\Lambda_b$ baryon in the QCD limit, where sea and valence quark masses become equal. In particular, we find...

Lee, Jong-Wan

2014-01-01

89

Matrix Elements and Few-Body Calculations within the Unitary Correlation Operator Method  

E-print Network

We employ the Unitary Correlation Operator Method (UCOM) to construct correlated, low-momentum matrix elements of realistic nucleon-nucleon interactions. The dominant short-range central and tensor correlations induced by the interaction are included explicitly by an unitary transformation. Using correlated momentum-space matrix elements of the Argonne V18 potential, we show that the unitary transformation eliminates the strong off-diagonal contributions caused by the short-range repulsion and the tensor interaction, and leaves a correlated interaction dominated by low-momentum contributions. We use correlated harmonic oscillator matrix elements as input for no-core shell model calculations for few-nucleon systems. Compared to the bare interaction, the convergence properties are dramatically improved. The bulk of the binding energy can already be obtained in very small model spaces or even with a single Slater determinant. Residual long-range correlations, not treated explicitly by the unitary transformation, can easily be described in model spaces of moderate size allowing for fast convergence. By varying the range of the tensor correlator we are able to map out the Tjon line and can in turn constrain the optimal correlator ranges.

R. Roth; H. Hergert; P. Papakonstantinou; T. Neff; H. Feldmeier

2005-05-30

90

Application of the Design Structure Matrix (DSM) to the real estate development process  

E-print Network

This thesis presents a pioneering application of an engineering systems framework, the Design Structure Matrix (DSM), to model the real estate development (RED) process. The DSM is a process modeling tool that originated ...

Bulloch, Benjamin (Benjamin Edward)

2009-01-01

91

Evaluating wilderness recreational opportunities: application of an impact matrix  

USGS Publications Warehouse

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.

1992-01-01

92

Evaluation of Concepts for Mulitiple Application Thermal Reactor for Irradiation eXperiments (MATRIX)  

SciTech Connect

The Advanced Test Reactor (ATR) is a high power density test reactor specializing in fuel and materials irradiation. For more than 45 years, the ATR has provided irradiations of materials and fuels testing along with radioisotope production. Originally operated primarily in support of the Offcie of Naval Reactors (NR), the mission has gradually expanded to cater to other customers, such as the DOE Office of Nuclear Energy (NE), private industry, and universities. Unforeseen circumstances may lead to the decommissioning of ATR, thus leaving the U.S. Government without a large-scale materials irradiation capability to meet the needs of its nuclear energy and naval reactor missions. In anticipation of this possibility, work was performed under the Laboratory Directed Research and Development (LDRD) program to investigate test reactor concepts that could satisfy the current missions of the ATR along with an expanded set of secondary missions. This work can be viewed as an update to a project from the 1990’s called the Broad Application Test Reactor (BATR). In FY 2012, a survey of anticipated customer needs was performed, followed by analysis of the original BATR concepts with fuel changed to low-enriched uranium. Departing from these original BATR designs, four concepts were identified for further analysis in FY2013. The project informally adopted the acronym MATRIX (Multiple-Application Thermal Reactor for Irradiation eXperiments). This report discusses analysis of the four MATRIX concepts along with a number of variations on these main concepts. Designs were evaluated based on their satisfaction of anticipated customer requirements and the “Cylindrical” variant was selected for further analysis of options. This downselection should be considered preliminary and the backup alternatives should include the other three main designs. The baseline Cylindrical MATRIX design is expected to be capable of higher burnup than the ATR (or longer cycle length given a particular batch scheme). The volume of test space in IPTs is larger in MATRIX than in ATR with comparable magnitude of neutron flux. In addition to the IPTs, the Cylindrical MATRIX concept features test spaces at the centers of fuel assemblies where very high fast flux can be achieved. This magnitude of fast flux is similar to that achieved in the ATR A-positions, however, the available volume having these conditions is greater in the MATRIX design than in the ATR. From the analyses performed in this work, it appears that the Cylindrical MATRIX design can be designed to meet the anticipated needs of the ATR replacement reactor. However, this statement must be qualified by acknowledging that this design is quite immature, and therefore any requirements currently met must be re-evaluated as the design matures. Also, some of the requirements were not strictly met, but are believed to be achievable once features to be added later are designed.

Michael A. Pope; Hans D. Gougar; John M. Ryskamp

2013-09-01

93

36 CFR 1194.21 - Software applications and operating systems.  

...2014-07-01 2014-07-01 false Software applications and operating systems... Technical Standards § 1194.21 Software applications and operating systems. (a) When software is designed to run on a system...

2014-07-01

94

Massive 3-loop ladder diagrams for quarkonic local operator matrix elements  

NASA Astrophysics Data System (ADS)

3-loop diagrams of the ladder-type, which emerge for local quarkonic twist-2 operator matrix elements, are computed directly for general values of the Mellin variable N using Appell-function representations and applying modern summation technologies provided by the package Sigma and the method of hyperlogarithms. In some of the diagrams generalized harmonic sums with ??{1,1/2,2} emerge beyond the usual nested harmonic sums. As the asymptotic representation of the corresponding integrals shows, the generalized sums conspire giving well behaved expressions for large values of N. These diagrams contribute to the 3-loop heavy flavor Wilson coefficients of the structure functions in deep-inelastic scattering in the region Q2?m2.

Ablinger, Jakob; Blümlein, Johannes; Hasselhuhn, Alexander; Klein, Sebastian; Schneider, Carsten; Wißbrock, Fabian

2012-11-01

95

Massive 3-loop Ladder Diagrams for Quarkonic Local Operator Matrix Elements  

E-print Network

3-loop diagrams of the ladder-type, which emerge for local quarkonic twist-2 operator matrix elements, are computed directly for general values of the Mellin variable $N$ using Appell-function representations and applying modern summation technologies provided by the package {\\sf Sigma} and the method of hyperlogarithms. In some of the diagrams generalized harmonic sums with $\\xi \\in \\{1,1/2,2\\}$ emerge beyond the usual nested harmonic sums. As the asymptotic representation of the corresponding integrals shows, the generalized sums conspire giving well behaved expressions for large values of $N$. These diagrams contribute to the 3-loop heavy flavor Wilson coefficients of the structure functions in deep-inelastic scattering in the region $Q^2 \\gg m^2$.

Ablinger, Jakob; Hasselhuhn, Alexander; Klein, Sebastian; Schneider, Carsten; Wißbrock, Fabian

2012-01-01

96

A List of Matrix Flows with Applications Moody T. Chu  

E-print Network

cult problems. The ow approach has potential applications ranging from new development of numerical-up problem whose solution is trivial while the other is the real problem whose solution is di cult to nd

97

R-matrix Methods with an application to 12C(alpha,gamma)16O  

E-print Network

We review some aspects of R-matrix theory and its application to the semi-empirical analysis of nuclear reactions. Important applications for nuclear astrophysics and recent results for the ${}^{12}{\\rm C}(\\alpha,\\gamma){}^{16}{\\rm O}$ reaction are emphasized.

Carl R. Brune

2010-05-24

98

Improved MALDI-TOF Microbial Mass Spectrometry Imaging by Application of a Dispersed Solid Matrix  

NASA Astrophysics Data System (ADS)

The key step in high quality microbial matrix-assisted laser desorption/ionization mass spectrometry imaging (microbial MALDI MSI) is the fabrication of a homogeneous matrix coating showing a fine-grained morphology. This application note addresses a novel method to apply solid MALDI matrices onto microbial cultures grown on thin agar media. A suspension of a mixture of 2,5-DHB and ?-CHCA is sprayed onto the agar sample surface to form highly homogeneous matrix coatings. As a result, the signal intensities of metabolites secreted by the fungus Aspergillus fumigatus were found to be clearly enhanced.

Vergeiner, Stefan; Schafferer, Lukas; Haas, Hubertus; Müller, Thomas

2014-08-01

99

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

100

Extended Krylov subspaces approximations of matrix functions. Application to computational electromagnetics  

SciTech Connect

There is now a growing interest in the area of using Krylov subspace approximations to compute the actions of matrix functions. The main application of this approach is the solution of ODE systems, obtained after discretization of partial differential equations by method of lines. In the event that the cost of computing the matrix inverse is relatively inexpensive, it is sometimes attractive to solve the ODE using the extended Krylov subspaces, originated by actions of both positive and negative matrix powers. Examples of such problems can be found frequently in computational electromagnetics.

Druskin, V.; Lee, Ping [Schlumberger-Doll Research, Ridgefield, CT (United States); Knizhnerman, L. [Central Geophysical Expedition, Moscow (Russian Federation)

1996-12-31

101

On Low Rank Matrix Approximations with Applications to Synthesis ...  

E-print Network

The only known to us result on low rank approximation of matrices in uniform norm is the one in [9]; it states ..... to the relative accuracy ? requires O(n2 ln(1/?)) elementary operations. The total ..... Intelligence, 3559, 545-560. Springer-Verlag

2011-05-23

102

An Application of the Infinite Matrix Theory to Mathieu Equation  

Microsoft Academic Search

In this paper we study the infinite linear system M?X=0 equivalent to the Mathieu equation. Applying some results in summability we determine the Floquet exponents corresponding to the solutions of the differential equation. We also determine an approximation of the corresponding solutions and study the kernel of the operator represented by M?. Finally we deal with the Mathieu equation with

Bruno de Malafosse

2006-01-01

103

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

104

Blood Vessel-Derived Acellular Matrix for Vascular Graft Application  

PubMed Central

To overcome the issues connected to the use of autologous vascular grafts and artificial materials for reconstruction of small diameter (<6?mm) blood vessels, this study aimed to develop acellular matrix- (AM-) based vascular grafts. Rat iliac arteries were decellularized by a detergent-enzymatic treatment, whereas endothelial cells (ECs) were obtained through enzymatic digestion of rat skin followed by immunomagnetic separation of CD31-positive cells. Sixteen female Lewis rats (8 weeks old) received only AM or previously in vitro reendothelialized AM as abdominal aorta interposition grafts (about 1?cm). The detergent-enzymatic treatment completely removed the cellular part of vessels and both MHC class I and class II antigens. One month after surgery, the luminal surface of implanted AMs was partially covered by ECs and several platelets adhered in the areas lacking cell coverage. Intimal hyperplasia, already detected after 1 month, increased at 3 months. On the contrary, all grafts composed by AM and ECs were completely covered at 1 month and their structure was similar to that of native vessels at 3 months. Taken together, our findings show that prostheses composed of AM preseeded with ECs could be a promising approach for the replacement of blood vessels. PMID:25136610

Dall'Olmo, Luigi; Zanusso, Ilenia; Di Liddo, Rosa; Chioato, Tatiana; Bertalot, Thomas; Conconi, Maria Teresa

2014-01-01

105

Solid-supported phospholipid bilayers: separation matrix for proteomics applications  

E-print Network

and provide an excellent environment for membrane proteins. These key parameters made this membrane supported platform an ideal system for applications in biosensors and lab-on-a-chip devices. My work is divided into two areas. The first area is centered...,32 dynamics, 33 multivalent ligand-receptor interactions, 34,35 electrochemical properties of membranes, 36 development of membrane-based biosensors, 37 and microscopic separation devices. 38 Supported bilayers consist of a continuous fluid membrane...

Diaz Vazquez, Arnaldo Joel

2009-05-15

106

Generalized Sylvester theorems for periodic applications in matrix optics  

NASA Astrophysics Data System (ADS)

Sylvester's theorem is often applied to problems involving light propagation through periodic optical systems represented by unimodular 2 X 2 transfer matrices. We extend this theorem to apply to broader classes of optics-related matrices. These matrices may be 2 X 2 or take on an important augmented 3 X 3 form. The results, which are summarized in tabular form, are useful for the analysis and the synthesis of a variety of optical systems, such as those that contain periodic distributed-feedback lasers, lossy birefringent filters, periodic pulse compressors, and misaligned lenses and mirrors. The results are also applicable to other types of system such as periodic electric circuits with intracavity independent sources, high-energy particle accelerators, and periodic computer graphics manipulations that may include object translation. As an example, we use the 3 X 3 form of Sylvester's theorem to examine Gaussian beam propagation in a misaligned resonator.

Tovar, Anthony A.; Casperson, Lee W.

1995-03-01

107

ESTIMATION OF NORMALIZED COHERENCY MATRIX THROUGH THE SIRV MODEL. APPLICATION TO HIGH RESOLUTION POLSAR DATA  

Microsoft Academic Search

In the context of non-Gaussian polarimetric clutter mod- els, this paper presents an application of the recent ad- vances in the field of Spherically Invariant Random Vec- tors (SIRV) modelling for coherency matrix estimation in heterogeneous clutter. The complete description of the POLSAR data set is achieved by estimating the span and the normalized coherency independently. The normal- ized coherency

ONERA DEMR

108

Silk fibroin based biomimetic artificial extracellular matrix for hepatic tissue engineering applications  

Microsoft Academic Search

Hepatic tissue engineering, which aims to construct artificial liver tissues, requires a suitable extracellular matrix (ECM) for growth and proliferation of metabolically active hepatocytes. The current paper describes the development of a biomimetic artificial ECM, for hepatic tissue engineering applications, by mimicking the architectural features and biochemical composition of native ECM. Electrospinning was chosen as the fabrication technique of choice,

Naresh Kasoju; Utpal Bora

2012-01-01

109

Advanced composites: fabrication processes for selected resin matrix materials. Space shuttle engineering and operations support  

Microsoft Academic Search

This design note is based on present state of the art for epoxy and polyimide matrix composite fabrication technology. Boron\\/epoxy and polyimide and graphite\\/epoxy and polyimide structural parts can be successfully fabricated. Fabrication cycles for polyimide matrix composites have been shortened to near epoxy cycle times. Nondestructive testing has proven useful in detecting defects and anomalies in composite structure elements.

Welhart

1976-01-01

110

From Operating-System Correctness to Pervasively Verified Applications  

NASA Astrophysics Data System (ADS)

Though program verification is known and has been used for decades, the verification of a complete computer system still remains a grand challenge. Part of this challenge is the interaction of application programs with the operating system, which is usually entrusted with retrieving input data from and transferring output data to peripheral devices. In this scenario, the correct operation of the applications inherently relies on operating-system correctness. Based on the formal correctness of our real-time operating system Olos, this paper describes an approach to pervasively verify applications running on top of the operating system.

Daum, Matthias; Schirmer, Norbert W.; Schmidt, Mareike

111

Space Operations Learning Center Facebook Application  

NASA Technical Reports Server (NTRS)

The proposed Space Operations Learning Center (SOLC) Facebook module, initially code-named Spaceville, is intended to be an educational online game utilizing the latest social networking technology to reach a broad audience base and inspire young audiences to be interested in math, science, and engineering. Spaceville will be a Facebook application/ game with the goal of combining learning with a fun game and social environment. The mission of the game is to build a scientific outpost on the Moon or Mars and expand the colony. Game activities include collecting resources, trading resources, completing simple science experiments, and building architectures such as laboratories, habitats, greenhouses, machine shops, etc. The player is awarded with points and achievement levels. The player s ability increases as his/her points and levels increase. A player can interact with other players using multiplayer Facebook functionality. As a result, a player can discover unexpected treasures through scientific missions, engineering, and working with others. The player creates his/her own avatar with his/her selection of its unique appearance, and names the character. The player controls the avatar to perform activities such as collecting oxygen molecules or building a habitat. From observations of other successful social online games such as Farmville and Restaurant City, a common element of these games is having eye-catching and cartoonish characters, and interesting animations for all activities. This will create a fun, educational, and rewarding environment. The player needs to accumulate points in order to be awarded special items needed for advancing to higher levels. Trophies will be awarded to the player when certain goals are reached or tasks are completed. In order to acquire some special items needed for advancement in the game, the player will need to visit his/her neighboring towns to discover the items. This is the social aspect of the game that requires the player to go out of his/her own establishment to explore what is in the neighborhood. Spaceville will take advantage of Facebook s successful architecture to inspire a new audience of scientists and engineers for the future.

Lui, Ben; Milner, Barbara; Binebrink, Dan; Kuok, Heng

2012-01-01

112

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

113

Ensemble Prediction System Matrix: Characteristics of Operational Ensemble Prediction Systems (EPS)  

NSDL National Science Digital Library

This one-stop Ensemble Model Matrix provides information on the configurations of the NCEP Short-Range Ensemble Forecast (SREF) and Medium-Range Ensemble Forecast (MREF) systems. Information on ensemble perturbation methods; NWP model resolution, dynamics, physics (precipitation, radiation, land surface and turbulence); and ensemble post-processing and verification links are provided. As the ensemble prediction systems (EPSs) are improved, the information in the Ensemble Model Matrix will be updated. Additionally, as new EPSs are added to AWIPS, we will add new columns to the Ensemble Model Matrix.

Comet

2006-04-05

114

PCOS - An operating system for modular applications  

NASA Technical Reports Server (NTRS)

This paper is an introduction to the PCOS operating system for the MC68000 family processors. Topics covered are: development history; development support; rational for development of PCOS and salient characteristics; architecture; and a brief comparison of PCOS to UNIX.

Tharp, V. P.

1986-01-01

115

Dexterous Operations on ISS and Future Applications  

NASA Technical Reports Server (NTRS)

The Mobile Servicing System (MSS) is a complex robotics system used extensively in the assembly, inspection and maintenance of the International Space Station (ISS). Its external components are comprised of the Space Station Remote Manipulator System (SSRMS), the Mobile Base System (MBS), and the Special Purpose Dexterous Manipulator (SPDM or "Dextre"). Dexterous robotic maintenance operations on the ISS are now enabled with the launch and deployment of "Dextre" in March 2008 and the recently completed commissioning to support nominal operations. These operations include allowing for maintenance of the MSS capability to be executed uniquely via robotic means. Examples are detailed inspection and the removal and replacement of On-orbit Replaceable Units (ORUs) located outside the pressurized volume of the ISS, alleviating astronauts from performing numerous risky and time-consuming extra-vehicular activities (EVAs). In light of the proposed extension of the ISS to 2020 and beyond, "Dextre" can also be seen as a resource for the support and conduct of external ISS experiments. "Dextre" can be utilized to move experiments around ISS, as test bed for more elaborate experiments outside the original design intent, and as a unique platform for external experiments. This paper summarizes the status of "Dextre", its planned use, and future potential for dexterous operations on the ISS. Lessons learned from the planning and execution of SPDM commissioning are first introduced, and significant differences between "Dextre" and SSRMS operations are discussed. The use of ground control as the predominant method for operating "Dextre" is highlighted, along with the benefits and challenges that this poses. Finally, the latest plans for dexterous operations on ISS are summarized including visiting vehicle unloading, nominal maintenance, and operations of a more experimental flavor.

Keenan, P. Andrew; Read, David A.

2011-01-01

116

Application Software Structure Enables NIF Operations  

SciTech Connect

The NIF Integrated Computer Control System (ICCS) application software uses a set of service frameworks that assures uniform behavior spanning the front-end processors (FEPs) and supervisor programs. This uniformity is visible both in the way each program employs shared services and in the flexibility it affords for attaching graphical user interfaces (GUIs). Uniformity of structure across applications is desired for the benefit of programmers who will be maintaining the many programs that constitute the ICCS. In this paper, the framework components that have the greatest impact on the application structure are discussed.

Fong, K W; Estes, C M; Fisher, J M; Shelton, R T

2001-10-17

117

SRV: A Virtual Reality Application to Electrical Substations Operation Training  

Microsoft Academic Search

Presents SRV (Virtual Reality System), a virtual reality application to train personnel associated with the manual operation of electrical substation equipment. We present a low-cost PC-based application which allows the user both to know the basic elements of an electrical substation in terms of appearance, behaviour and functionality, and to operate the substation by interacting with the switching equipment and

Eder Arroyo; José Luis Los Arcos

1999-01-01

118

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.

119

From Operating-System Correctness to Pervasively Verified Applications  

E-print Network

correctness. Based on the formal correctness of our real-time operating system Olos, this paper describes of hardware, a real-time operating system, and application programs. We have implemented the operating system of its automotive subproject is a pervasively verified distributed real-time system, consisting

Paris-Sud XI, Université de

120

Dirac Operator on Hypersurfaces and Applications  

E-print Network

the existence of a Spinc Killing spinor on homogeneous 3-dimensional manifolds E (, ) with 4-dimensional of the Dirac operator, parallel and Killing spinors, manifolds with boundary and boundary conditions, Sasaki or Killing spinor field coming from Z, C. B¨ar [5] derived an upper bound for the eigenvalues of the Dirac

Paris-Sud XI, Université de

121

Application of Ozone in Food Processing Operations  

Microsoft Academic Search

The potential utility of ozone in food processing lies in the fact that ozone is a 52% stronger oxidant than chlorine. The widespread use of chlorine by the US food industry is under scrutiny and the acceptance of chlorine as the primary sanitizing agent for food process operations is being reconsidered by many processors and regulators. By US law, ozone

Brian C. Hampson; Steven R. Fiori

122

The logarithmic contributions to the asymptotic massive Wilson coefficients and operator matrix elements in deeply inelastic scattering  

NASA Astrophysics Data System (ADS)

We calculate the logarithmic contributions to the massive Wilson coefficients for deep-inelastic scattering in the asymptotic region $Q^2 \\gg m^2$ to 3-loop order in the fixed-flavor number scheme and present the corresponding expressions for the massive operator matrix elements needed in the variable flavor number scheme. Explicit expressions are given both in Mellin-$N$ space and $z$-space.

Behring, A.; Bierenbaum, I.; Blümlein, J.; De Freitas, A.; Klein, S.; Wißbrock, F.

2014-09-01

123

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

Microsoft Academic Search

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

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

1995-01-01

124

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

125

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

NASA Astrophysics Data System (ADS)

Semi-leptonic electroweak interactions in nuclei—such as ? decay, ? capture, charged- and neutral-current neutrino reactions, and electron scattering—are described by a set of multipole operators carrying definite parity and angular momentum, obtained by projection from the underlying nuclear charge and three-current operators. If these nuclear operators are approximated by their one-body forms and expanded in the nucleon velocity through order |p?|/M, where p? and M are the nucleon momentum and mass, a set of seven multipole operators is obtained. Nuclear structure calculations are often performed in a basis of Slater determinants formed from harmonic oscillator orbitals, a choice that allows translational invariance to be preserved. Harmonic-oscillator single-particle matrix elements of the multipole operators can be evaluated analytically and expressed in terms of finite polynomials in q, where q is the magnitude of the three-momentum transfer. While results for such matrix elements are available in tabular form, with certain restriction on quantum numbers, the task of determining the analytic form of a response function can still be quite tedious, requiring the folding of the tabulated matrix elements with the nuclear density matrix, and subsequent algebra to evaluate products of operators. Here we provide a Mathematica script for generating these matrix elements, which will allow users to carry out all such calculations by symbolic manipulation. This will eliminate the errors that may accompany hand calculations and speed the calculation of electroweak nuclear cross sections and rates. We illustrate the use of the new script by calculating the cross sections for charged- and neutral-current neutrino scattering in 12C. Program summaryProgram title: SevenOperators Catalogue identifier: AEAY_v1_0 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEAY_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.: 2227 No. of bytes in distributed program, including test data, etc.: 19 382 Distribution format: tar.gz Programming language: Mathematica Computer: Any computer running Mathematica; tested on Mac OS X PowerPC (32-bit) running Mathematica 6.0.0 Operating system: Any running Mathematica RAM: Memory requirements determined by Mathematica; 512 MB or greater RAM and hard drive space of at least 3.0 GB recommended Classification: 17.16, 17.19 Nature of problem: Algebraic evaluation of harmonic oscillator nuclear matrix elements for the one-body multipole operators governing semi-leptonic weak interactions, such as charged- or neutral-current neutrino scattering off nuclei. Solution method: Mathematica evaluation of associated angular momentum algebra and spherical Bessel function radial integrals. Running time: Depends on the complexity of the one-body density matrix employed, but times of a few seconds are typical.

Haxton, Wick; Lunardini, Cecilia

2008-09-01

126

Different Methods for the Two-Nucleon T-Matrix in the Operator Form  

NASA Astrophysics Data System (ADS)

We compare three methods to calculate the nucleon-nucleon t-matrix based on the three-dimensional formulation of Golak et al. (Phys Rev C 81:034006, 2010). In the first place we solve a system of complex linear inhomogeneous equations directly for the t-matrix. Our second method is based on iterations and a variant of the Lanczos algorithm. In the third case we obtain the t-matrix in two steps, solving a system of real linear equations for the k-matrix expansion coefficients and then solving an on-shell equation, which connects the scalar coefficients of the k- and t-matrices. A very good agreement among the three methods is demonstrated for selected nucleon-nucleon scattering observables using a chiral next-to-next-to-leading-order neutron-proton potential. We also apply our three-dimensional framework to the demanding problem of proton-proton scattering, using a corresponding version of the nucleon-nucleon potential and supplementing it with the (screened) Coulomb force, taken also in the three-dimensional form. We show converged results for two different screening functions and find a very good agreement with other methods dealing with proton-proton scattering.

Golak, J.; Skibi?ski, R.; Wita?a, H.; Topolnicki, K.; Glöckle, W.; Nogga, A.; Kamada, H.

2012-10-01

127

Recursive mass matrix factorization and inversion: An operator approach to open- and closed-chain multibody dynamics  

NASA Technical Reports Server (NTRS)

This report advances a linear operator approach for analyzing the dynamics of systems of joint-connected rigid bodies.It is established that the mass matrix M for such a system can be factored as M=(I+H phi L)D(I+H phi L) sup T. This yields an immediate inversion M sup -1=(I-H psi L) sup T D sup -1 (I-H psi L), where H and phi are given by known link geometric parameters, and L, psi and D are obtained recursively by a spatial discrete-step Kalman filter and by the corresponding Riccati equation associated with this filter. The factors (I+H phi L) and (I-H psi L) are lower triangular matrices which are inverses of each other, and D is a diagonal matrix. This factorization and inversion of the mass matrix leads to recursive algortihms for forward dynamics based on spatially recursive filtering and smoothing. The primary motivation for advancing the operator approach is to provide a better means to formulate, analyze and understand spatial recursions in multibody dynamics. This is achieved because the linear operator notation allows manipulation of the equations of motion using a very high-level analytical framework (a spatial operator algebra) that is easy to understand and use. Detailed lower-level recursive algorithms can readily be obtained for inspection from the expressions involving spatial operators. The report consists of two main sections. In Part 1, the problem of serial chain manipulators is analyzed and solved. Extensions to a closed-chain system formed by multiple manipulators moving a common task object are contained in Part 2. To retain ease of exposition in the report, only these two types of multibody systems are considered. However, the same methods can be easily applied to arbitrary multibody systems formed by a collection of joint-connected regid bodies.

Rodriguez, G.; Kreutz, K.

1988-01-01

128

Multifunctional Nanotube Polymer Nanocomposites for Aerospace Applications: Adhesion between SWCNT and Polymer Matrix  

NASA Technical Reports Server (NTRS)

Multifunctional structural materials can enable a novel design space for advanced aerospace structures. A promising route to multifunctionality is the use of nanotubes possessing the desired combination of properties to enhance the characteristics of structural polymers. Recent nanotube-polymer nanocomposite studies have revealed that these materials have the potential to provide structural integrity as well as sensing and/or actuation capabilities. Judicious selection or modification of the polymer matrix to promote donor acceptor and/or dispersion interactions can improve adhesion at the interface between the nanotubes and the polymer matrix significantly. The effect of nanotube incorporation on the modulus and toughness of the polymer matrix will be presented. Very small loadings of single wall nanotubes in a polyimide matrix yield an effective sensor material that responds to strain, stress, pressure, and temperature. These materials also exhibit significant actuation in response to applied electric fields. The objective of this work is to demonstrate that physical properties of multifunctional material systems can be tailored for specific applications by controlling nanotube treatment (different types of nanotubes), concentration, and degree of alignment.

Park, Cheol; Wise, Kristopher E.; Kang, Jin Ho; Kim, Jae-Woo; Sauti, Godfrey; Lowther, Sharon E.; Lillehei, Peter T.; Smith, Michael W.; Siochi, Emilie J.; Harrison, Joycelyn S.; Jordan, Kevin

2008-01-01

129

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

130

[Applicability of a natural swelling matrix as the propellant of osmotic pump tablets].  

PubMed

The purpose of this study is to investigate the applicability of a natural swelling matrix derived from boat-fruited sterculia seed (SMS) as the propellant of osmotic pump tablets. The sugar components, static swelling, water uptake and viscosity of SMS were determined and compared with that of polythylene oxide (WSR-N10 and WSR-303). Both ribavirin and glipizide were used as water-soluble and water-insoluble model drugs. Then, the monolayer osmotic pump tablets of ribavirin and the bilayer osmotic pump tablets of glipizide were prepared using SMS as the osmotically active substance and propellant. SMS was mainly composed of rhamnose, arabinose, xylose and galactose and exhibited relatively high swelling ability. The area of the disintegrated matrix tablet was 20.1 times as that at initial after swelling for 600 s. SMS swelled rapidly and was fully swelled (0.5%) in aqueous solution with relative low viscosity (3.66 +/- 0.03) mPa x s at 25 degrees C. The monolayer osmotic pump tablets of ribavirin and the bilayer osmotic pump tablets of glipizide using SMS as propellant exhibited typical drug release features of osmotic pumps. In conclusion, the swelling matrix derived from boat-fruited sterculia seed, with low viscosity and high swelling, is a potential propellant in the application of osmotic pump tablets. PMID:24187843

Wu, Li; Li, Hai-Yan; Yin, Xian-Zhen; Li, Ying; Chen, Jian-Xiu; Hu, Rong-feng; Zhang, Ji-Wen

2013-08-01

131

The application of CRM to military operations  

NASA Technical Reports Server (NTRS)

The detailed content of the CRM training component of the C-5 Aircrew Training System (ATS) was left to the discretion of the contractor. As a part of determining what the content should be, United Airlines Services Corporation has made an effort to understand how the needs of MAC crews compare with those of civilian airline crews. There are distinct similarities between the crew roles in the cockpits of civilian airliners and military air transports. Many of the attitudes and behaviors exhibited by civil and military crew members are comparable, hence much of the training in the field referred to as Cockpit Resource Management (CRM) is equally appropriate to civil or military aircrews. At the same time, there are significant differences which require assessment to determine if modifications to what might be termed generic CRM are necessary. The investigation enabled the definition and specification of CRM training which is believed to address the needs of the C-5 operational community. The study has concentrated largely on military airlift, but the training objectives and course content of the CRM training are readily adaptable to a wider range of military cockpits than are found in strategic airlift. For instance, CRM training focusing on communication, leadership, situational awareness, and crew coordination is just as appropriate, with some modification, to the pilots manning a flight to Tactical Airlift Command A-7's as it is to the pilots, flight engineers, and loadmasters crewing a C-5.

Cavanagh, Dale E.; Williams, Kenneth R.

1987-01-01

132

A FACTORIZATION OF THE SPECTRAL GALERKIN SYSTEM FOR PARAMETERIZED MATRIX EQUATIONS: DERIVATION AND APPLICATIONS  

E-print Network

Recent work has explored solver strategies for the linear system of equations arising from a spectral Galerkin approximation of the solution of PDEs with parameterized (or stochastic) inputs. We consider the related problem of a matrix equation whose matrix and right hand side depend on a set of parameters (e.g. a PDE with stochastic inputs semidiscretized in space) and examine the linear system arising from a similar Galerkin approximation of the solution. We derive a useful factorization of this system of equations, which yields bounds on the eigenvalues, clues to preconditioning, and a flexible implementation method for a wide array of problems. We complement this analysis with (i) a numerical study of preconditioners on a standard elliptic PDE test problem and (ii) a fluids application using existing CFD codes; the MATLAB codes used in the numerical studies are available online.

Constantine, Paul G; Iaccarino, Gianluca

2010-01-01

133

Application performance in the QLinux multimedia operating system  

Microsoft Academic Search

In this paper, we argue that conventional operating systems need to be enhanced with predictable resource management mechanisms to meet the diverse performance requirements of emerging multimedia and web applications. We present QLinux—a multimedia operating system based on the Linux kernel that meets this requirement. QLinux employs hierarchical schedulers for fair, predictable allocation of processor, disk and network bandwidth, and

Vijay Sundaram; Abhishek Chandra; Pawan Goyal; Prashant J. Shenoy; Jasleen Sahni; Harrick M. Vin

2000-01-01

134

Polynorbornene as a low loss matrix material for IR metamaterial applications.  

SciTech Connect

Novel low loss photopatternable matrix materials for IR metamaterial applications were synthesized using the ring opening metathesis polymerization reaction (ROMP) of norbornene followed by a partial hydrogenation to remove most of the IR absorbing olefin groups which absorb in the 8-12 {micro}m range. Photopatterning was achieved via crosslinking of the remaining olefin groups with alpha, omega-dithiols via the thiol-ene coupling reaction. Since ROMP is a living polymerization the molecular weight of the polymer can be controlled simply by varying the ratio of catalyst to monomer. In order to determine the optimum photopattenable IR matrix material we varied the amount of olefin remaining after the partial hydrogenation. Hydrogenation was accomplished using tosyl hydrazide. The degree of hydrogenation can be controlled by altering the reaction time or reaction stoichiometry and the by-products can be easily removed during workup by precipitation into ethanol. Several polymers have been prepared using this reduction scheme including two polymers which had 54% and 68% olefin remaining. Free standing films (approx. 12 {micro}m) were prepared from the 68% olefin material using draw-down technique and subsequently irradiated with a UV lamp (365 nm) for thirty minutes to induce crosslinking via thiol-ene reaction. After crosslinking, the olefin IR-absorption band disappeared and the Tg of the matrix material increased; both desirable properties for IR metamaterial applications. The polymer system has inherent photopatternable behavior primarily because of solubility differences between the pre-polymer and cross-linked matrix. Photopatterned structures using the 54% as well as the 68% olefin material were easily obtained. The synthesis, processing, and IR absorption data and the ramifications to dielectric metamaterials will be discussed.

Arrington, Christian Lew; Sinclair, Michael B.; Ginn, James Cleveland, III; Lee, Yun-Ju; Sanchez, Andrea E.; Clem, Paul Gilbert; Hines, Paul; Dirk, Shawn M.; Rasberry, Roger D.

2010-11-01

135

Operating System Support for Task-Aware Applications  

E-print Network

as a sequence of tasks ­ Users should be provided with an execution context that is adapted to the taskOperating System Support for Task-Aware Applications Jo~ao Garcia and Paulo Ferreira Distributed of applications and files. Users wanting to perform a particular task have to navigate the file system of one

Ferreira, Paulo

136

Processor Capacity Reserves: Operating System Support for Multimedia Applications  

E-print Network

. Our approach is to provide the predictability of real-time systems while retaining the flexibility capacity reserves in Real-Time Mach, and we describe the performance of our system on several types of applications. 1 Introduction Multimedia applications require that operating systems support time

Savage, Stefan

137

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

...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...

2014-01-01

138

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

Code of Federal Regulations, 2010 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...

2010-01-01

139

Application of AI technology to nuclear plant operations  

SciTech Connect

In this paper, applications of Artificial Intelligence (AI) Technology to nuclear-power plant operation are reviewed. AI Technology is advancing rapidly and in the next five years is expected to enjoy widespread application to operation, maintenance, management and safety. Near term emphasis on a sensor validation, scheduling, alarm handling, and expert systems for procedural assistance. Ultimate applications are envisioned to culminate in autonomous control such as would be necessary for a power system in space, where automatic control actions are taken based upon reasoned conclusions regarding plant conditions, capability and control objectives.

Sackett, J.I.

1988-01-01

140

Actively Cooled Ceramic Matrix Composite Concepts for High Heat Flux Applications  

NASA Technical Reports Server (NTRS)

High temperature composite heat exchangers are an enabling technology for a number of aeropropulsion applications. They offer the potential for mass reductions of greater than fifty percent over traditional metallics designs and enable vehicle and engine designs. Since they offer the ability to operate at significantly higher operating temperatures, they facilitate operation at reduced coolant flows and make possible temporary uncooled operation in temperature regimes, such as experienced during vehicle reentry, where traditional heat exchangers require coolant flow. This reduction in coolant requirements can translate into enhanced range or system payload. A brief review of the approaches, challenges and test results are presented, along with a status of recent government-funded projects.

Eckel, Andrew J.; Jaskowiak, Martha H.; Dickens, Kevin

2004-01-01

141

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

142

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

Microsoft Academic Search

The current capabilities of continuous silicon-carbide fiber-reinforced titanium matrix composites (TMCs) are reviewed with\\u000a respect to application needs and compared to the capabilities of conventional high-temperature monolithic alloys and aluminides.\\u000a In particular, the properties of a firstgeneration titanium aluminide composite, SCS-6\\/Ti-24Al-11Nb, and a second-generation\\u000a metastable beta alloy composite, SCS-6\\/TIMETAL 21S, are compared with the nickel-base superalloy IN100, the high-temperature\\u000a titanium

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

1995-01-01

143

Evaluation of the relative gain matrix for distillation systems at steady and unsteady state operation  

E-print Network

of benzene and carbon tetrachloraide using the approach developed by Rosenbrock. . A Theta method of convergence for conventional and complex columns at unsteady state operation was developed by Waggoner (1964). Waggoner transformed the set of integral... of benzene and carbon tetrachloraide using the approach developed by Rosenbrock. . A Theta method of convergence for conventional and complex columns at unsteady state operation was developed by Waggoner (1964). Waggoner transformed the set of integral...

Mijares Cervantes, Gerardo

2012-06-07

144

Application of the transmission line matrix method to the analysis of slab and channel optical waveguides  

NASA Astrophysics Data System (ADS)

The applicability of the three-dimensional vectorial transmission line matrix (TLM) method to the analysis of optical waveguiding structures is demonstrated. Any waveguide geometry, even incorporating anisotropic materials, can be treated by taking into account the coupling between all optical field components. The application of the TLM method to optical waveguides is shown to be both efficient and accurate. The dispersion curve for the fundamental TE-like mode of a typical rib dielectric waveguide as well as its electric-field pattern is obtained by the use of the TLM method. Numerical comparisons with the integral-formulation technique, the effective-index method, the finite-difference analysis, the spectral-index method, and the beam-propagation technique are also included.

Moniri-Ardakani, S. M.; Glytsis, E. N.

1995-05-01

145

Applications of multiple-constraint matrix updates to the optimal control of large structures  

NASA Technical Reports Server (NTRS)

Low-authority control or vibration suppression in large, flexible space structures can be formulated as a linear feedback control problem requiring computation of displacement and velocity feedback gain matrices. To ensure stability in the uncontrolled modes, these gain matrices must be symmetric and positive definite. In this paper, efficient computation of symmetric, positive-definite feedback gain matrices is accomplished through the use of multiple-constraint matrix update techniques originally developed for structural identification applications. Two systems were used to illustrate the application: a simple spring-mass system and a planar truss. From these demonstrations, use of this multiple-constraint technique is seen to provide a straightforward approach for computing the low-authority gains.

Smith, S. W.; Walcott, B. L.

1992-01-01

146

Development and application of NDE methods for monolithic and continuous fiber ceramic matrix composites.  

SciTech Connect

Monolithic structural ceramics and continuous fiber ceramic matrix composites (CMCs) are being developed for application in many thermally and chemically aggressive environments where structural reliability is paramount. We have recently developed advanced nondestructive evaluation (NDE) methods that can detect distributed ''defects'' such as density gradients and machining-induced damage in monolithic materials, as well as delamination, porosity, and throughwall cracks, in CMC materials. These advanced NDE methods utilize (a) high-resolution, high-sensitivity thermal imaging; (b) high-resolution X-ray imaging; (c) laser-based elastic optical scattering; (d) acoustic resonance; (e) air-coupled ultrasonic methods; and (f) high-sensitivity fluorescent penetrant technology. This paper discusses the development and application of these NDE methods relative to ceramic processing and ceramic components used in large-scale industrial gas turbines and hot gas filters for gas stream particulate cleanup.

Ellingson, W. A.

1999-05-21

147

The automated Matrix-Element reweighting and its applications at the LHC  

NASA Astrophysics Data System (ADS)

Given a sample of experimental events and a set of theoretical models, the matrix element method (MEM) is a procedure to select the most plausible model that governs the production of these events. From a theoretical point of view, it is probably the most powerful multi-variate analysis technique since it maximally uses the information contained in the Feynman amplitudes. This technique is now widely known since it has been used for the precision top mass measurement at Tevatron, for example. The MadWeight software is presented. MadWeight is a phase-space generator designed for the automated numerical estimation of matrix elements based on MadGraph amplitudes. With the modern computing resources, it allows the large-scale deployment of the MEM technique on high-statistics data and simulated samples. Several applications of the method at LHC are discussed, including the measurement of the spin and parity of the recently discovered boson, signal-to-background discrimination, full differential spectrum estimation and other promising applications.

Mertens, Alexandre

2014-06-01

148

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

149

InkTag: Secure Applications on an Untrusted Operating System  

PubMed Central

InkTag is a virtualization-based architecture that gives strong safety guarantees to high-assurance processes even in the presence of a malicious operating system. InkTag advances the state of the art in untrusted operating systems in both the design of its hypervisor and in the ability to run useful applications without trusting the operating system. We introduce paraverification, a technique that simplifies the InkTag hypervisor by forcing the untrusted operating system to participate in its own verification. Attribute-based access control allows trusted applications to create decentralized access control policies. InkTag is also the first system of its kind to ensure consistency between secure data and metadata, ensuring recoverability in the face of system crashes. PMID:24429939

Hofmann, Owen S.; Kim, Sangman; Dunn, Alan M.; Lee, Michael Z.; Witchel, Emmett

2014-01-01

150

40 CFR Table 4 to Subpart Xxxx of... - Operating Limits for Puncture Sealant Application Control Devices  

Code of Federal Regulations, 2011 CFR

... true Operating Limits for Puncture Sealant Application Control Devices 4 Table...Part 63—Operating Limits for Puncture Sealant Application Control Devices As stated...with the operating limits for puncture sealant application affected sources in...

2011-07-01

151

40 CFR Table 4 to Subpart Xxxx of... - Operating Limits for Puncture Sealant Application Control Devices  

Code of Federal Regulations, 2010 CFR

... true Operating Limits for Puncture Sealant Application Control Devices 4 Table...Part 63—Operating Limits for Puncture Sealant Application Control Devices As stated...with the operating limits for puncture sealant application affected sources in...

2010-07-01

152

40 CFR Table 4 to Subpart Xxxx of... - Operating Limits for Puncture Sealant Application Control Devices  

Code of Federal Regulations, 2013 CFR

... true Operating Limits for Puncture Sealant Application Control Devices 4 Table...Part 63—Operating Limits for Puncture Sealant Application Control Devices As stated...with the operating limits for puncture sealant application affected sources in...

2013-07-01

153

40 CFR Table 4 to Subpart Xxxx of... - Operating Limits for Puncture Sealant Application Control Devices  

Code of Federal Regulations, 2012 CFR

... false Operating Limits for Puncture Sealant Application Control Devices 4 Table...Part 63—Operating Limits for Puncture Sealant Application Control Devices As stated...with the operating limits for puncture sealant application affected sources in...

2012-07-01

154

40 CFR Table 4 to Subpart Xxxx of... - Operating Limits for Puncture Sealant Application Control Devices  

... false Operating Limits for Puncture Sealant Application Control Devices 4 Table...Part 63—Operating Limits for Puncture Sealant Application Control Devices As stated...with the operating limits for puncture sealant application affected sources in...

2014-07-01

155

Application of Accelerometer Data to Mars Global Surveyor Aerobraking Operations  

Microsoft Academic Search

Aerobraking was selected for the Mars Global Surveyor mission as a primary and enabling operation. The application of accelerometer data for determining atmospheric density during operations for the é rst phase of aerobraking isreported.Acceleration was measured alongthebody zaxis, which is theaxisnominally into theè ow. For a 1-s count time, thedata have a resolution of 0.332 mm \\/s, permitting the recovery

R. H. Tolson; G. M. Keating; G. J. Cancro; J. S. Parker; S. N. Noll; B. L. Wilkerson

1999-01-01

156

ELECTRICAL CONDUCTIVITY AND SCATTERING MATRIX FOR DIRAC OPERATORS ON MANIFOLDS WITH CYLINDRICAL CONTACTS  

Microsoft Academic Search

In the static limit of linear response theory, the electrical con- ductivity is a linear operator taking closed electric flelds into closed electric current densities. The induced mapping in cohomology is called the electrical conductance. Using the notion of relative de Rham cohomology of a mani- fold M with boundary, we give a thorough discussion of what is meant by

MATTHIAS LESCH; FLORIAN MERZ; MARTIN R. ZIRNBAUER

157

Remote Sensing of Water Quality: Bridging Operational and Applications Communities  

NASA Astrophysics Data System (ADS)

One of the highest priorities of the NASA Applied Sciences Program (ASP) is to benefit society by supporting the development of tools, services, and applications that leverage Earth observations (EO) and satellite assets, and their transfer to operations. Toward this goal, the Water Resources Application Area of ASP has been exploring how satellite remote sensing could contribute to water quality monitoring decisions and practices and organized a workshop at the biennial National Water Quality Monitoring Conference 2014 in Cincinnati, Ohio.

Lee, Christine M.; Orne, Tiffani; Schaeffer, Blake

2014-09-01

158

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

... 2014-07-01 false Standards: Chemical milling maskant application operations...Facilities § 63.747 Standards: Chemical milling maskant application operations...owner or operator of a new or existing chemical milling maskant operation subject...

2014-07-01

159

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

160

Web Application Software for Ground Operations Planning Database (GOPDb) Management  

NASA Technical Reports Server (NTRS)

A Web application facilitates collaborative development of the ground operations planning document. This will reduce costs and development time for new programs by incorporating the data governance, access control, and revision tracking of the ground operations planning data. Ground Operations Planning requires the creation and maintenance of detailed timelines and documentation. The GOPDb Web application was created using state-of-the-art Web 2.0 technologies, and was deployed as SaaS (Software as a Service), with an emphasis on data governance and security needs. Application access is managed using two-factor authentication, with data write permissions tied to user roles and responsibilities. Multiple instances of the application can be deployed on a Web server to meet the robust needs for multiple, future programs with minimal additional cost. This innovation features high availability and scalability, with no additional software that needs to be bought or installed. For data governance and security (data quality, management, business process management, and risk management for data handling), the software uses NAMS. No local copy/cloning of data is permitted. Data change log/tracking is addressed, as well as collaboration, work flow, and process standardization. The software provides on-line documentation and detailed Web-based help. There are multiple ways that this software can be deployed on a Web server to meet ground operations planning needs for future programs. The software could be used to support commercial crew ground operations planning, as well as commercial payload/satellite ground operations planning. The application source code and database schema are owned by NASA.

Lanham, Clifton; Kallner, Shawn; Gernand, Jeffrey

2013-01-01

161

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

NASA Technical Reports Server (NTRS)

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 the fibers) were strongly affected by the fiber volume fraction with higher volume fractions resulting in lower thermal conductivities. The effect of architecture on thermal conductivity followed the cosine squared law for simple architectures. Insufficient data are available currently to model more complex architectures, but adding fibers in the direction of the heat flow increases the thermal conductivity as low conductivity plies are supplemented by high conductivity plies. Thermal expansion tests were conducted on the Gr fibers and Gr/Cu composites. The results show a considerable thermal expansion mismatch between the fibers and the Cu matrix. The longitudinal thermal expansion showed a strong dependence on the architecture of the Gr/Cu composites. The composites also show a thermal expansion hysteresis. The hysteresis was eliminated by an engineered interface. Mechanical testing concentrated on the dynamic modulus and strength of the composites. The dynamic modulus of the Gr/Cu composites was 305 GPa up to 400 C, a value equivalent to Be. The strengths of the composites were less than expected, but this is attributed to the poor bond across the interface between the Gr fibers and Cu matrix. Testing of composites with an engineered interface is expected to yield strengths nearer the values predicted by the rule of mixtures.

Ellis, David L.

1992-01-01

162

Operation of lead-acid batteries for HEV applications  

Microsoft Academic Search

Hybrid electric vehicles (HEV) are approaching commercial realization, many using advanced high power, lead-acid batteries. The HEV application is quite challenging due to the high currents going to and from the batteries. Although cycle efficiencies of thin plate lead-acid batteries are as high or better than other available power sources, the heat generated by HEV mode operation is not a

J. B. Olson; E. D. Sexton

2000-01-01

163

Dual-band operation vertical patch antenna for WLAN applications  

Microsoft Academic Search

In this paper, a novel design of the dual-band operation vertical patch antenna are proposed. The structure of proposed antenna consists of two vertical patches which is different from the architecture of traditional planar antennas. By utilizing the broadband feeding mechanism, the antenna bandwidth is significantly increased. And, two separate wide resonant modes for WLAN applications can be generated by

Kuo-Chien Chao; Fa-Shian Chang; Hong-Twu chen; Chia-Hung Lu; Yung-Tao Liu

2007-01-01

164

Re) Configurable Real-Time Operating Systems and Their Applications  

Microsoft Academic Search

There are trends in the area of real-time computing to shift from RTOS kernels (fixed or configurable ones) to more flexible approaches, where a RTOS (real-time operating system) is generated exactly in the way it is needed for a specific application context. One example for this approach is the component library Dreams, developed at HNI of Universitat Paderborn. This library

Carsten Böke; Marcelo Götz; Tales Heimfarth; Dania El Kebbe; Franz J. Rammig; Sabina Rips

2003-01-01

165

Interactive intelligent remote operations: application to space robotics  

NASA Astrophysics Data System (ADS)

A set of tolls addressing the problems specific to the control and monitoring of remote robotic systems from extreme distances has been developed. The tools include the capability to model and visualize the remote environment, to generate and edit complex task scripts, to execute the scripts to supervisory control mode and to monitor and diagnostic equipment from multiple remote locations. Two prototype systems are implemented for demonstration. The first demonstration, using a prototype joint design called Dexter, shows the applicability of the approach to space robotic operation in low Earth orbit. The second demonstration uses a remotely controlled excavator in an operational open-pit tar sand mine. This demonstrates that the tools developed can also be used for planetary exploration operations as well as for terrestrial mining applications.

Dupuis, Erick; Gillett, G. R.; Boulanger, Pierre; Edwards, Eric; Lipsett, Michael G.

1999-11-01

166

Extracellular matrix of dental pulp stem cells: applications in pulp tissue engineering using somatic MSCs  

PubMed Central

Dental Caries affects approximately 90% of the world's population. At present, the clinical treatment for dental caries is root canal therapy. This treatment results in loss of tooth sensitivity and vitality. Tissue engineering can potentially solve this problem by enabling regeneration of a functional pulp tissue. Dental pulp stem cells (DPSCs) have been shown to be an excellent source for pulp regeneration. However, limited availability of these cells hinders its potential for clinical translation. We have investigated the possibility of using somatic mesenchymal stem cells (MSCs) from other sources for dental pulp tissue regeneration using a biomimetic dental pulp extracellular matrix (ECM) incorporated scaffold. Human periodontal ligament stem cells (PDLSCs) and human bone marrow stromal cells (HMSCs) were investigated for their ability to differentiate toward an odontogenic lineage. In vitro real-time PCR results coupled with histological and immunohistochemical examination of the explanted tissues confirmed the ability of PDLSCs and HMSCs to form a vascularized pulp-like tissue. These findings indicate that the dental pulp stem derived ECM scaffold stimulated odontogenic differentiation of PDLSCs and HMSCs without the need for exogenous addition of growth and differentiation factors. This study represents a translational perspective toward possible therapeutic application of using a combination of somatic stem cells and extracellular matrix for pulp regeneration. PMID:24432005

Ravindran, Sriram; Huang, Chun-Chieh; George, Anne

2014-01-01

167

A matrix-form GSM-CFD solver for incompressible fluids and its application to hemodynamics  

NASA Astrophysics Data System (ADS)

A GSM-CFD solver for incompressible flows is developed based on the gradient smoothing method (GSM). A matrix-form algorithm and corresponding data structure for GSM are devised to efficiently approximate the spatial gradients of field variables using the gradient smoothing operation. The calculated gradient values on various test fields show that the proposed GSM is capable of exactly reproducing linear field and of second order accuracy on all kinds of meshes. It is found that the GSM is much more robust to mesh deformation and therefore more suitable for problems with complicated geometries. Integrated with the artificial compressibility approach, the GSM is extended to solve the incompressible flows. As an example, the flow simulation of carotid bifurcation is carried out to show the effectiveness of the proposed GSM-CFD solver. The blood is modeled as incompressible Newtonian fluid and the vessel is treated as rigid wall in this paper.

Yao, Jianyao; Liu, G. R.

2014-10-01

168

LBB application in the US operating and advanced reactors  

SciTech Connect

The regulatory application of leak before break (LBB) for operating and advanced reactors in the U.S. is described. The U.S. Nuclear Regulatory Commission (NRC) has approved the application of LBB for six piping systems in operating reactors: reactor coolant system primary loop piping, pressurizer surge, safety injection accumulator, residual heat removal, safety injection, and reactor coolant loop bypass. The LBB concept has also been applied in the design of advanced light water reactors. LBB applications, and regulatory considerations, for pressurized water reactors and advanced light water reactors are summarized in this paper. Technology development for LBB performed by the NRC and the International Piping Integrity Research Group is also briefly summarized.

Wichman, K.; Tsao, J.; Mayfield, M.

1997-04-01

169

The generalization of the extended Stevens operators to higher ranks and spins, and a systematic review of the tables of the tensor operators and their matrix elements  

NASA Astrophysics Data System (ADS)

Spherical (S) and tesseral (T) tensor operators (TOs) have been extensively used in, for example, EMR and optical spectroscopy of transition ions. To enable a systematic review of the published tables of the operators and their matrix elements (MEs) we have generated the relevant tables by computer, using Mathematica programs. Our review reveals several misprints/errors in the major sources of TTOs—the conventional Stevens operators (CSOs—components q\\ge 0 ) and the extended ones (ESOs—all q) for rank k = 2,4, and 6—as well as of some STOs with k\\le 8 . The implications of using incorrect operators and/or MEs for the reliability of EMR-related programs and interpretation of experimental data are discussed. Studies of high-spin complexes like Mn12 (S = 10) and Fe19 (S = 33/2) require operator and ME listings up to k = 2S, which are not presently available. Using the algorithms developed recently by Ryabov, the generalized ESOs and their MEs for arbitrary rank k and spin S are generated by computer, using Mathematica. The extended tables enable simulation of the energy levels for arbitrary spin systems and symmetry cases. Tables are provided for the ESOs not available in the literature, with odd k = 3,5, and 7 for completeness; however, for the newly generalized ESOs with the most useful even rank k = 8,10, and 12 only, in view of the large listings sizes. General source codes for the generation of the ESO listings and their ME tables are available from the authors.

Rudowicz, C.; Chung, C. Y.

2004-08-01

170

Application of AI techniques to blast furnace operations  

SciTech Connect

It was during the first stages of application of artificial intelligence (AI) to industrial fields, that the ironmaking division of Mizushima works at Kawasaki Steel recognized its potential. Since that time, the division has sought applications for these techniques to solve various problems. AI techniques applied to control the No. 3 blast furnace operations at the Mizushima works include: Blast furnace control by a diagnostic type of expert system that gives guidance to the actions required for blast furnace operation as well as control of furnace heat by automatically setting blast temperature; Hot stove combustion control by a combination of fuzzy inference and a physical model to insure good thermal efficiency of the stove; and blast furnace burden control using neural networks makes it possible to connect the pattern of gas flow distribution with the condition of the furnace. Experience of AI to control the blast furnace and other ironmaking operations has proved its capability for achieving automation and increased operating efficiency. The benefits are very high. For these reasons, the applications of AI techniques will be extended in the future and new techniques studied to further improve the power of AI.

Iida, Osamu; Ushijima, Yuichi; Sawada, Toshiro [Kawasaki Steel Corp., Kurashiki (Japan)

1995-10-01

171

Underwater application of nasal decongestants: method for special operations.  

PubMed

A simple method of emergency underwater application of a nasal decongestant in divers to prevent diving-related accidents or even fatalities attributable to sequelae of middle-ear and sinus barotrauma of ascent was evaluated. Eleven military divers had to inject 1 mL of 0.02% methylene blue into a central venous catheter after having inserted the tip between their upper lip and the mask at 1 m depth in a pool. After injection, the head had to be reclined. Blue liquid flowing from a diver's nostril and a "bitter" taste sensation reported immediately after surfacing indicated successful application. All divers were observed to have had blue liquid flowing from the nostril of application, and one diver could not describe the taste. This method of underwater application of nasal decongestants may be useful for emergency prevention in divers, especially during covert operations. Underwater availability of the system in a special kit carried by divers would be required. PMID:11143432

Mutzbauer, T S; Mueller, P H; Sigg, O; Tetzlaff, K; Neubauer, B

2000-11-01

172

The $O(\\alpha_s^3 n_f T_F^2 C_{A,F})$} Contributions to the Gluonic Massive Operator Matrix Elements  

E-print Network

The $O(\\alpha_s^3 n_f T_F^2 C_{A,F})$ terms to the massive gluonic operator matrix elements are calculated for general values of the Mellin variable $N$. These twist-2 matrix elements occur as transition functions in the variable flavor number scheme at NNLO. The calculation uses sum-representations in generalized hypergeometric series turning into harmonic sums. The analytic continuation to complex values of $N$ is provided.

Blümlein, Johannes; Klein, Sebastian; Schneider, Carsten

2012-01-01

173

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

174

Application of matrix heat exchangers to thermomechanical exergy recovery from liquid hydrogen  

Microsoft Academic Search

This paper reports the outcome of a project aimed at exploring thermomechanical exergy recovery from liquid hydrogen.The basis of this project was the conceptual design, development and testing of a new process for CO2 removal from air for use in alkaline fuel cells operating with hydrogen stored as a liquid, addressing simultaneously:•thermomechanical exergy recovery from liquid hydrogen, and•its application to

Vikas Ahuja; Roger Green

1998-01-01

175

Coiled-tubing applications for blowout-control operations  

SciTech Connect

Coiled-tubing drilling is now being used in various operations. Its complete field of applications is not currently established. Coiled tubing used for well control while drilling is a new field where its limits are being explored. This paper provides guidelines on topics to be considered in determining the applicability of coiled tubing for well-control problems. The information provided is based on recent field experiences with several well-control problems when drilling vent and relief wells. In some cases, coiled-tubing drilling capabilities, by necessity, were significantly extended beyond levels the industry considered to be upper limits. Well control cannot always be handled by coiled tubing. It is a special-application tool that can handle many situations and is, in some cases, clearly the optimum choice for the application. This paper presents guidelines for selecting coiled tubing for each application and discusses economics. It also describes coiled-tubing operations for regaining control of blowout wells in certain situations and gives technical requirements for planning and executing these types of jobs. Case histories where coiled-tubing units (CTU`s) have been used to regain control of drilling and producing wells are provided for illustration.

Adams, N.J. [Neal Adams Firefighters Inc., Houston, TX (United States); Mack, S.K.; Fannin, V.R.; Rocchi, T.

1996-05-01

176

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

177

Evaluation of Ceramic Matrix Composite Technology for Aircraft Turbine Engine Applications  

NASA Technical Reports Server (NTRS)

The goals of the NASA Environmentally Responsible Aviation (ERA) Project are to reduce the NO(x) emissions, fuel burn, and noise from turbine engines. In order to help meet these goals, commercially-produced ceramic matrix composite (CMC) components and environmental barrier coatings (EBCs) are being evaluated as parts and panels. The components include a CMC combustor liner, a CMC high pressure turbine vane, and a CMC exhaust nozzle as well as advanced EBCs that are tailored to the operating conditions of the CMC combustor and vane. The CMC combustor (w/EBC) could provide 2700 F temperature capability with less component cooling requirements to allow for more efficient combustion and reductions in NOx emissions. The CMC vane (w/EBC) will also have temperature capability up to 2700 F and allow for reduced fuel burn. The CMC mixer nozzle will offer reduced weight and improved mixing efficiency to provide reduced fuel burn. The main objectives are to evaluate the manufacturability of the complex-shaped components and to evaluate their performance under simulated engine operating conditions. Progress in CMC component fabrication, evaluation, and testing is presented in which the goal is to advance from the proof of concept validation (TRL 3) to a system/subsystem or prototype demonstration in a relevant environment (TRL 6).

Halbig, Michael C.; Jaskowiak, Martha H.; Kiser, James D.; Zhu, Dongming

2013-01-01

178

Matrix fatigue cracking mechanisms of alpha(2) TMC for hypersonic applications  

SciTech Connect

The objective of this work was to understand matrix cracking mechanisms in a unidirectional alpha[sub 2] TMC in possible hypersonic applications. A (0)[sub 8] SCS-6/Ti-24Al-11Nb (at. percent) TMC was first subjected to a variety of simple isothermal and nonisothermal fatigue cycles to evaluate the damage mechanisms in simple conditions. A modified ascent mission cycle test was then performed to evaluate the combined effects of loading modes. This cycle mixes mechanical cycling at 150 and 483 C, sustained loads, and a slow thermal cycle to 815 C. At low cyclic stresses and strains more common in hypersonic applications, environment-assisted surface cracking limited fatigue resistance. This damage mechanism was most acute for out-of-phase nonisothermal cycles having extended cycle periods and the ascent mission cycle. A simple linear fraction damage model was employed to help understand this damage mechanism. Time-dependent environmental damage was found to strongly influence out-of-phase and mission life, with mechanical cycling damage due to the combination of external loading and CTE mismatch stresses playing a smaller role. The mechanical cycling and sustained loads in the mission cycle also had a smaller role.

Gabb, T.P.; Gayda, J.

1994-02-01

179

Multi-scale mechanism based life prediction of polymer matrix composites for high temperature airframe applications  

NASA Astrophysics Data System (ADS)

A multi-scale mechanism-based life prediction model is developed for high-temperature polymer matrix composites (HTPMC) for high temperature airframe applications. In the first part of this dissertation the effect of Cloisite 20A (C20A) nano-clay compounding on the thermo-oxidative weight loss and the residual stresses due to thermal oxidation for a thermoset polymer bismaleimide (BMI) are investigated. A three-dimensional (3-D) micro-mechanics based finite element analysis (FEA) was conducted to investigate the residual stresses due to thermal oxidation using an in-house FEA code (NOVA-3D). In the second part of this dissertation, a novel numerical-experimental methodology is outlined to determine cohesive stress and damage evolution parameters for pristine as well as isothermally aged (in air) polymer matrix composites. A rate-dependent viscoelastic cohesive layer model was implemented in an in-house FEA code to simulate the delamination initiation and propagation in unidirectional polymer composites before and after aging. Double cantilever beam (DCB) experiments were conducted (at UT-Dallas) on both pristine and isothermally aged IM-7/BMI composite specimens to determine the model parameters. The J-Integral based approach was adapted to extract cohesive stresses near the crack tip. Once the damage parameters had been characterized, the test-bed FEA code employed a micromechanics based viscoelastic cohesive layer model to numerically simulate the DCB experiment. FEA simulation accurately captures the macro-scale behavior (load-displacement history) simultaneously with the micro-scale behavior (crack-growth history).

Upadhyaya, Priyank

180

Ventilation Systems Operating Experience Review for Fusion Applications  

SciTech Connect

This report is a collection and review of system operation and failure experiences for air ventilation systems in nuclear facilities. These experiences are applicable for magnetic and inertial fusion facilities since air ventilation systems are support systems that can be considered generic to nuclear facilities. The report contains descriptions of ventilation system components, operating experiences with these systems, component failure rates, and component repair times. Since ventilation systems have a role in mitigating accident releases in nuclear facilities, these data are useful in safety analysis and risk assessment of public safety. An effort has also been given to identifying any safety issues with personnel operating or maintaining ventilation systems. Finally, the recommended failure data were compared to an independent data set to determine the accuracy of individual values. This comparison is useful for the International Energy Agency task on fusion component failure rate data collection.

L. C. Cadwallader

1999-12-01

181

Design and applications of new fluorinated liquid crystals of fused ring systems for active matrix LCD  

NASA Astrophysics Data System (ADS)

The thermal and physical properties of several new classes of fluorinated liquid crystals of fused ring systems are discussed. The fluorinated phenyl-decahydronaphthalenes have low birefringence and relatively high clearing points. The naphthalenes with four fluoro-groups, including a fluoro- substituent at C-1 position for the naphthalene ring, have large dielectric anisotropy, large birefringence and low visco-elastic ratio which leads to quick response time in a twisted nematic liquid crystal display (TN-LCD). The pentafluorinated tetrahydronaphthalene has large dielectric anisotropy with relatively low birefringence and exhibits good stability of nematic phase at low temperature. We have designed some liquid crystal mixtures for an active matrix LCD with advanced performance. The liquid crystal mixtures with low birefringence, sufficiently high voltage holding ratio and wide operating temperature range, which are suitable for a reflective liquid crystal display, have been achieved. The liquid crystal mixtures, which exhibit about 10 ms of quick response time for a TN-LCD and are suitable for TV, also have been achieved.

Takatsu, Haruyoshi; Takehara, Sadao; Takeuchi, Kiyofumi; Iwashita, Yoshinori

2001-12-01

182

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

183

ZKCM: a C++ library for multiprecision matrix computation with applications in quantum information  

E-print Network

ZKCM is a C++ library developed for the purpose of multiprecision matrix computation, on the basis of the GNU MP and MPFR libraries. It provides an easy-to-use syntax and convenient functions for matrix manipulations including those often used in numerical simulations in quantum physics. Its extension library, ZKCM_QC, is developed for simulating quantum computing using the time-dependent matrix-product-state simulation method. This paper gives an introduction about the libraries with practical sample programs.

Akira SaiToh

2013-03-25

184

ZKCM: a C++ library for multiprecision matrix computation with applications in quantum information  

E-print Network

ZKCM is a C++ library developed for the purpose of multiprecision matrix computation, on the basis of the GNU MP and MPFR libraries. It provides an easy-to-use syntax and convenient functions for matrix manipulations including those often used in numerical simulations in quantum physics. Its extension library, ZKCM_QC, is developed for simulating quantum computing using the time-dependent matrix-product-state simulation method. This paper gives an introduction about the libraries with practical sample programs.

SaiToh, Akira

2013-01-01

185

ZKCM: A C++ library for multiprecision matrix computation with applications in quantum information  

NASA Astrophysics Data System (ADS)

ZKCM is a C++ library developed for the purpose of multiprecision matrix computation, on the basis of the GNU MP and MPFR libraries. It provides an easy-to-use syntax and convenient functions for matrix manipulations including those often used in numerical simulations in quantum physics. Its extension library, ZKCM_QC, is developed for simulating quantum computing using the time-dependent matrix-product-state simulation method. This paper gives an introduction about the libraries with practical sample programs.

SaiToh, Akira

2013-08-01

186

Matrix elements in the coupled-cluster approach - With application to low-lying states in Li  

NASA Technical Reports Server (NTRS)

A procedure is suggested for evaluating matrix elements of an operator between wavefunctions in the coupled-cluster form. The use of the exponential ansatz leads to compact exponential expressions also for matrix elements. Algorithms are developed for summing all effects of one-particle clusters and certain chains of two-particle clusters (containing the well-known random-phase approximation as a subset). The treatment of one-particle perturbations in single valence states is investigated in detail. As examples the oscillator strength for the 2s-2p transition in Li as well as the hyperfine structure for the two states are studied and compared to earlier work.

Martensson-Pendrill, Ann-Marie; Ynnerman, Anders

1990-01-01

187

Methodology of management of dredging operations II. Applications.  

PubMed

This paper presents the new methodology of management of dredging operations. Derived partly from existing methodologies (OECD, PNUE, AIPCN), it aims to be more comprehensive, mixing the qualities and the complementarities of previous methodologies. The application of the methodology has been carried out on the site of the Port of Dunkirk (FRANCE). Thus, a characterization of the sediments of this site has allowed a zoning of the Port to be established in to zones of probable homogeneity of sediments. Moreover, sources of pollution have been identified, with an aim of prevention. Ways of waste improvement have also been developed, to answer regional needs, from a point of view of competitive and territorial intelligence. Their development has required a mutualisation of resources between professionals, research centres and local communities, according to principles of industrial ecology. Lastly, a tool of MultiCriteria Decision-Making Aid (M.C.D.M.A.) has been used to determine the most relevant scenario (or alternative, or action) for a dredging operation intended by the Port of Dunkirk. These applications have confirmed the relevance of this methodology for the management of dredging operations. PMID:16583827

Junqua, G; Abriak, N E; Gregoire, P; Dubois, V; Mac Farlane, F; Damidot, D

2006-04-01

188

Java application for the superposition T-matrix code to study the optical properties of cosmic dust aggregates  

NASA Astrophysics Data System (ADS)

In this paper, we report the development of a java application for the Superposition T-matrix code, JaSTA (Java Superposition T-matrix App), to study the light scattering properties of aggregate structures. It has been developed using Netbeans 7.1.2, which is a java integrated development environment (IDE). The JaSTA uses double precession superposition codes for multi-sphere clusters in random orientation developed by Mackowski and Mischenko (1996). It consists of a graphical user interface (GUI) in the front hand and a database of related data in the back hand. Both the interactive GUI and database package directly enable a user to model by self-monitoring respective input parameters (namely, wavelength, complex refractive indices, grain size, etc.) to study the related optical properties of cosmic dust (namely, extinction, polarization, etc.) instantly, i.e., with zero computational time. This increases the efficiency of the user. The database of JaSTA is now created for a few sets of input parameters with a plan to create a large database in future. This application also has an option where users can compile and run the scattering code directly for aggregates in GUI environment. The JaSTA aims to provide convenient and quicker data analysis of the optical properties which can be used in different fields like planetary science, atmospheric science, nano science, etc. The current version of this software is developed for the Linux and Windows platform to study the light scattering properties of small aggregates which will be extended for larger aggregates using parallel codes in future. Catalogue identifier: AETB_v1_0 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AETB_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.: 571570 No. of bytes in distributed program, including test data, etc.: 120226886 Distribution format: tar.gz Programming language: Java, Fortran95. Computer: Any Windows or Linux systems capable of hosting a java runtime environment, java3D and fortran95 compiler; Developed on 2.40 GHz Intel Core i3. Operating system: Any Windows or Linux systems capable of hosting a java runtime environment, java3D and fortran95 compiler. RAM: Ranging from a few Mbytes to several Gbytes, depending on the input parameters. Classification: 1.3. External routines: jfreechart-1.0.14 [1] (free plotting library for java), j3d-jre-1.5.2 [2] (3D visualization). Nature of problem: Optical properties of cosmic dust aggregates. Solution method: Java application based on Mackowski and Mischenko's Superposition T-Matrix code. Restrictions: The program is designed for single processor systems. Additional comments: The distribution file for this program is over 120 Mbytes and therefore is not delivered directly when Download or Email is requested. Instead a html file giving details of how the program can be obtained is sent. Running time: Ranging from few minutes to several hours, depending on the input parameters. References: [1] http://www.jfree.org/index.html [2] https://java3d.java.net/

Halder, P.; Chakraborty, A.; Deb Roy, P.; Das, H. S.

2014-09-01

189

Application of fiber bridging models to fatigue crack growth in unidirectional titanium matrix composites  

NASA Technical Reports Server (NTRS)

Several fiber bridging models were reviewed and applied to study the matrix fatigue crack growth behavior in center notched (0)(sub 8) SCS-6/Ti-15-3 and (0)(sub 4) SCS-6/Ti-6Al-4V laminates. Observations revealed that fatigue damage consisted primarily of matrix cracks and fiber matrix interfacial failure in the (0)(sub 8) SCS-6/Ti-15-3 laminates. Fiber-matrix interface failure included fracture of the brittle reaction zone and cracking between the two carbon rich fiber coatings. Intact fibers in the wake of the matrix cracks reduce the stress intensity factor range. Thus, an applied stress intensity factor range is inappropriate to characterize matrix crack growth behavior. Fiber bridging models were used to determine the matrix stress intensity factor range in titanium metal matrix composites. In these models, the fibers in the wake of the crack are idealized as a closure pressure. An unknown constant frictional shear stress is assumed to act along the debond or slip length of the bridging fibers. The frictional shear stress was used as a curve fitting parameter to available data (crack growth data, crack opening displacement data, and debond length data). Large variations in the frictional shear stress required to fit the experimental data indicate that the fiber bridging models in their present form lack predictive capabilities. However, these models provide an efficient and relatively simple engineering method for conducting parametric studies of the matrix growth behavior based on constituent properties.

Bakuckas, J. G., Jr.; Johnson, W. S.

1992-01-01

190

Novel application of high pressure processing for the production of shellfish toxin matrix reference materials.  

PubMed

The production of homogeneous and stable matrix reference materials for marine biotoxins is important for the validation and implementation of instrumental methods of analysis. High pressure processing was investigated to ascertain potential advantages this technique may have in stabilising paralytic shellfish poisoning toxins in shellfish tissues compared to untreated materials. Oyster tissues were subjected to a range of different temperatures and pressures, with results showing a significant reduction in biological activity in comparison to control samples, without significantly altering toxin profiles. Tissue subjected to pressures >600 MPa at 50 °C was assessed for homogeneity and stability. The sample homogeneity was determined using a pre-column oxidation LC-FLD method and shown to be within accepted levels of within batch repeatability. Short and long-term stability studies were conducted over a range of temperatures, with analysis by pre and post column oxidation LC-FLD demonstrating improved stability of toxins compared to the untreated materials and with epimerisation of toxins also notably reduced in treated materials. This study confirmed the technique of high pressure processing to improve the stability of PSP toxins compared to untreated wet tissues and highlighted its applicability in reference material preparation where removal of biological activity is of importance. PMID:25086341

Turner, Andrew D; Powell, Andy L; Burrell, Stephen

2014-11-01

191

Development and Evaluation of Novel Metal Reinforced Ceramic Matrix Composites for High Temperature Applications  

NASA Astrophysics Data System (ADS)

For high temperature applications two novel ceramic-matrix composite (CMC) materials are manufactured, by embedding molybdenum (Mo) and Hastelloy X (HX) wire meshes in 7YSZ ceramic. The mechanical properties and oxidizing behaviour at 1050°C were investigated. The designs, fabrication, assessment of the mechanical strength, cyclic and isothermal oxidation of the CMCs are described in this thesis. After manufacturing meshes, NiCrA1Y bond coats and 7YSZ were applied via plasma spraying. Bonding strength in some CMC samples are improved by vacuum heat treating, then as-sprayed and heat treated CMCs are subjected to three-point bend and impact tests. Mo and HX wire mesh incorporation in 7YSZ increase the strength and the elongation to failure. In particular, Mo wire increases yield load of 7YSZ by at least 3 times and HX wire increases yield by 9 times. Mo/7YSZ CMC degrades and oxidizes after 330 hours at 1050°C tests, but HX/7YSZ shows higher oxidation resistance. The metallographic analysis shows NiCrA1Y bond coat cracks and delaminates from the wires during isothermal tests. Cyclic test, creating larger thermal stresses, worsens the damage. To increase the oxidation and mechanical properties of these composites, a more effective ceramic coating method is recommended. Overall, the advantages of HX/7YSZ composite suggest further testing and investigation.

Mohammadi, Teymoor

192

Direct electrochemistry of alcohol oxidase using multiwalled carbon nanotube as electroactive matrix for biosensor application.  

PubMed

Rapid detection of alcohol is important in clinical diagnosis and fermentation industry. An octameric alcohol oxidase (AOx) (Mr 675 kDa) from Pichia pastoris, immobilized on multiwalled carbon nanotubes-Nafion® (MWCNT-Nf) matrix and encapsulated with polyethylenimine (PEI) on gold electrode (AuE), showed a redox peak at 0.21V (vs. Ag/AgCl electrode at pH 7.5) for oxidation of alcohol. The electron transfer rate constant and surface coverage of the immobilized AOx were 1.69±0.15 s?¹ and 2.43×10?¹² mol cm?², respectively. Studies on response and kinetics of Au-MWCNT-Nf-AOx-PEI bioelectrodes for alcohol showed a linear response in the range of 8 ?M-42 ?M, response time of 55 s for steady state current, and detection limit of 5 ?M. The bioelectrode retains ~90% of the original response even after four weeks when stored in potassium phosphate buffer pH 7.5 at 4 °C. The fabricated bioelectrode was found to exclude interference caused by the common electroactive species such as ascorbic acid, uric acid, lactic acid, glucose and urea. The bioelectrode also showed reliable response characteristics in blood serum samples. The findings of the investigation have established the direct electrochemistry of the AOx protein and its potential biosensor application for quantitative detection of alcohol in blood serum. PMID:23000393

Das, Madhuri; Goswami, Pranab

2013-02-01

193

Algorithms and Application of Sparse Matrix Assembly and Equation Solvers for Aeroacoustics  

NASA Technical Reports Server (NTRS)

An algorithm for symmetric sparse equation solutions on an unstructured grid is described. Efficient, sequential sparse algorithms for degree-of-freedom reordering, supernodes, symbolic/numerical factorization, and forward backward solution phases are reviewed. Three sparse algorithms for the generation and assembly of symmetric systems of matrix equations are presented. The accuracy and numerical performance of the sequential version of the sparse algorithms are evaluated over the frequency range of interest in a three-dimensional aeroacoustics application. Results show that the solver solutions are accurate using a discretization of 12 points per wavelength. Results also show that the first assembly algorithm is impractical for high-frequency noise calculations. The second and third assembly algorithms have nearly equal performance at low values of source frequencies, but at higher values of source frequencies the third algorithm saves CPU time and RAM. The CPU time and the RAM required by the second and third assembly algorithms are two orders of magnitude smaller than that required by the sparse equation solver. A sequential version of these sparse algorithms can, therefore, be conveniently incorporated into a substructuring for domain decomposition formulation to achieve parallel computation, where different substructures are handles by different parallel processors.

Watson, W. R.; Nguyen, D. T.; Reddy, C. J.; Vatsa, V. N.; Tang, W. H.

2001-01-01

194

Noncollective excitations in low-energy heavy-ion reactions: Applicability of the random-matrix model  

NASA Astrophysics Data System (ADS)

We investigate the applicability of a random-matrix model to the description of noncollective excitations in heavy-ion reactions around the Coulomb barrier. To this end, we study fusion in the reaction 16O + 208Pb, taking account of the known noncollective excitations in the 208Pb nucleus. We show that the random-matrix model for the corresponding couplings reproduces reasonably well the exact calculations, obtained using empirical deformation parameters. This implies that the model may provide a powerful method for systems in which the noncollective couplings are not so well known.

Yusa, S.; Hagino, K.; Rowley, N.

2013-10-01

195

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

196

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

197

Leak before break application in French PWR plants under operation  

SciTech Connect

Practical applications of the leak-before break concept are presently limited in French Pressurized Water Reactors (PWR) compared to Fast Breeder Reactors. Neithertheless, different fracture mechanic demonstrations have been done on different primary, auxiliary and secondary PWR piping systems based on similar requirements that the American NUREG 1061 specifications. The consequences of the success in different demonstrations are still in discussion to be included in the global safety assessment of the plants, such as the consequences on in-service inspections, leak detection systems, support optimization,.... A large research and development program, realized in different co-operative agreements, completes the general approach.

Faidy, C. [EDF SEPTEN, Villeurbanne (France)

1997-04-01

198

Application of the Finite-Element Z-Matrix Method to e-H2 Collisions  

NASA Technical Reports Server (NTRS)

The present study adapts the Z-matrix formulation using a mixed basis of finite elements and Gaussians. This is a energy-independent basis which allows flexible boundary conditions and is amenable to efficient algorithms for evaluating the necessary matrix elements with molecular targets.

Huo, Winifred M.; Brown, David; Langhoff, Stephen R. (Technical Monitor)

1997-01-01

199

Piezoacoustic wave spectra using improved surface impedance matrix: Application to high impedance-contrast layered plates  

Microsoft Academic Search

Starting from the general modal solutions for a homogeneous layer of arbitrary material and crystalline symmetry, a matrix formalism is developed to establish the semi analytical expressions of the surface impedance matrices (SIM) for a single piezo-electric layer. By applying the electrical boundary conditions, the layer impedance matrix is reduced to a unified elastic form whether the material is piezoelectric

Victor Y. Zhang; Bertrand Dubus; Bernard Collet; Michel Destrade

2008-01-01

200

A Delphi–matrix approach to SEA and its application within the tourism sector in Taiwan  

Microsoft Academic Search

Strategic Environmental Assessment (SEA) is a procedural tool and within the framework of SEA, several different types of analytical methods can be used in the assessment. However, the impact matrix used currently in Taiwan has some disadvantages. Hence, a Delphi–matrix approach to SEA is proposed here to improve the performance of Taiwan's SEA. This new approach is based on the

Nae-Wen Kuo; Teng-Yuan Hsiao; Yue-Hwa Yu

2005-01-01

201

Potential Applications of Matrix Organization Theory for the New Jersey Department of Education. Position Paper.  

ERIC Educational Resources Information Center

Matrix organization focuses on the shift from cost center or process input planning to product output or results planning. Matrix organization puts the personnel and the resources where they are needed to get the job done. This management efficiency is brought about by dividing all organizational activities into two areas: (1) input or maintenance…

Hanson, J. Robert

202

Source based commutation in matrix converter fed power electronic transformer for power systems application  

Microsoft Academic Search

This paper proposes a source based commutation method for a matrix converter fed power electronic transformer. Two converters produce high frequency voltage across a transformer, with open ended primary. A third matrix converter converts the high frequency chopped voltage to line frequency. The leakage inductance of the transformer creates a commutation delay in the primary side to secondary side voltage

Shabari Nath; K. K. Mohapatra; Kaushik Basu; Ned Mohan

2010-01-01

203

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

204

Positive real synthesis using matrix inequalities for mechanical networks: application to vehicle suspension  

Microsoft Academic Search

This paper presents a procedure for the synthesis of positive real controllers based on matrix inequalities. Problems with H2 and H? cost are considered and the resulting bilinear matrix inequality problems are solved using local, iterative algorithms. The procedure is applied to the synthesis of passive suspensions for the optimization of certain performance measures for a quarter-car model. The characterization

Christakis Papageorgiou; Malcolm C. Smith

2006-01-01

205

Comparison of two matrix data structures for advanced CSM testbed applications  

NASA Technical Reports Server (NTRS)

The first section describes data storage schemes presently used by the Computational Structural Mechanics (CSM) testbed sparse matrix facilities and similar skyline (profile) matrix facilities. The second section contains a discussion of certain features required for the implementation of particular advanced CSM algorithms, and how these features might be incorporated into the data storage schemes described previously. The third section presents recommendations, based on the discussions of the prior sections, for directing future CSM testbed development to provide necessary matrix facilities for advanced algorithm implementation and use. The objective is to lend insight into the matrix structures discussed and to help explain the process of evaluating alternative matrix data structures and utilities for subsequent use in the CSM testbed.

Regelbrugge, M. E.; Brogan, F. A.; Nour-Omid, B.; Rankin, C. C.; Wright, M. A.

1989-01-01

206

A scalable, parallel matrix-free Stokes solver for geodynamic applications  

NASA Astrophysics Data System (ADS)

Here I describe a numerical method suitable for studying non-linear, large deformation processes in crustal and lithopspheric dynamics. The method utilizes a hybrid spatial discretisation which consists of mixed finite elements for the Stokes flow problem, coupled to a Lagrangian marker based discretisation to represent the material properties (viscosity and density). This approach is akin to the classical Marker-And-Cell (MAC) scheme of Harlow and the subsequently developed Material Point Method (MPM) of Sulsky and co-workers. The geometric flexibility and ease of modelling large deformation processes afforded by such mesh-particle methods has been exploited by the lithospheric dynamics community over the last 20 years. The strength of the Stokes preconditioner fundamentally controls the scientific throughput achievable and represents the largest bottleneck in the development of our understanding of geodynamic processes. The possibility to develop a 'cheap' and efficient preconditioning methodology which is suitable for the mixed Q2-P1 element is explored here. I describe a flexible strategy, which aims to address the Stokes preconditioning issue using an upper block triangular preconditioner, together with a geometric multi-grid preconditioner for the viscous block. The key to the approach is to utilize algorithms and data-structures that exploit current multi-core hardware and avoid the need for excessive global reductions. In order to develop a scalable method, special consideration is given to; the definition of the coarse grid operator, the smoother and the coarse grid solver. The performance characteristics of this hybrid matrix-free / partially assembled multi-level preconditioning strategy is examined. The robustness of the preconditioner with respect to the viscosity contrast and the topology of the viscosity field, together with the parallel scalability is demonstrated.

May, D.

2013-12-01

207

43 CFR 23.4 - Application for permission to conduct exploration operations.  

Code of Federal Regulations, 2010 CFR

...Application for permission to conduct exploration operations. 23.4 Section 23...the Secretary of the Interior SURFACE EXPLORATION, MINING AND RECLAMATION OF LANDS ...Application for permission to conduct exploration operations. No person...

2010-10-01

208

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

209

47 CFR 90.137 - Applications for operation at temporary locations.  

Code of Federal Regulations, 2013 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...

2013-10-01

210

76 FR 38597 - Regulatory Guidance: Applicability of the Federal Motor Carrier Safety Regulations to Operators...  

Federal Register 2010, 2011, 2012, 2013

...Applicability of the Federal Motor Carrier Safety Regulations to Operators...Equipment AGENCY: Federal Motor Carrier Safety Administration (FMCSA...applicability of the Federal Motor Carrier Safety Regulations to operators...DC 20590-0001. Hand Delivery: Ground Floor, Room...

2011-07-01

211

Component-Based Real-Time Operating System for Embedded Applications  

E-print Network

Component-Based Real-Time Operating System for Embedded Applications Fr´ed´eric Loiret1 , Juan-established Real-Time Operating System, and how component- based applications are built on top of it. We use

Boyer, Edmond

212

GIS applications for military operations in coastal zones  

NASA Astrophysics Data System (ADS)

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. Static products in the form of analog maps at varying scales traditionally have been used by military commanders and their operational planners. The rapidly changing battlefield of 21st Century warfare, however, demands dynamic mapping solutions. Commercial geographic information system (GIS) software for military-specific applications is now being developed and employed with digital databases to provide customized digital maps of variable scale, content and symbolization tailored to unique demands of military units. Research conducted by the Center for Remote Sensing and Mapping Science at the University of Georgia demonstrated the utility of GIS-based analysis and digital map creation when developing large-scale (1:10,000) products from littoral warfare databases. The methodology employed-selection of data sources (including high resolution commercial images and Lidar), establishment of analysis/modeling parameters, conduct of vehicle mobility analysis, development of models and generation of products (such as a continuous sea-land DEM and geo-visualization of changing shorelines with tidal levels)-is discussed. Based on observations and identified needs from the National Geospatial-Intelligence Agency, formerly the National Imagery and Mapping Agency, and the Department of Defense, prototype GIS models for military operations in sea, land and air environments were created from multiple data sets of a study area at US Marine Corps Base Camp Lejeune, North Carolina. Results of these models, along with methodologies for developing large-scale littoral warfare databases, aid the National Geospatial-Intelligence Agency in meeting littoral warfare analysis, modeling and map generation requirements for US military organizations.

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

213

Video Operations in the Gradient Domain Fusion of image sequences is a fundamental operation in numerous video applications and usually  

E-print Network

1 Video Operations in the Gradient Domain Abstract Fusion of image sequences is a fundamental operation in numerous video applications and usually consists of segmentation, matting and compositing. We present a unified framework for performing these operations on video in the gradient domain. Our approach

Cohen-Or, Daniel

214

Advanced Composites: Mechanical Properties and Hardware Programs for Selected Resin Matrix Materials. [considering space shuttle applications  

NASA Technical Reports Server (NTRS)

This design note presents typical mechanical properties tabulated from industrial and governmental agencies' test programs. All data are correlated to specific products and all of the best known products are presented. The data include six epoxies, eight polyimides and one polyquinoxaline matrix material. Bron and graphite are the fiber reinforcements. Included are forty-two summaries of advanced (resin matrix) composite programs in existence in the United States. It is concluded that the selection of appropriate matrices, the geometric manner in which the fibers are incorporated in the matrix and the durability of the bond between fiber and matrix establish the end properties of the composite material and the performance of the fabricated structure.

Welhart, E. K.

1976-01-01

215

A NEW MULTIDIMENSIONAL MATRIX INVERSE WITH APPLICATIONS TO MULTIPLE q-SERIES  

E-print Network

TO MULTIPLE q-SERIES CHRISTIAN KRATTENTHALERy AND MICHAEL SCHLOSSERy in the important discovery, jointly wit* *h Hsu, of a very ______________ y The authors were supported 1 #12; 2 CHRISTIAN KRATTENTHALER AND MICHAEL SCHLOSSER general matrix inversion [32

Krattenthaler, Christian

216

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

217

Preliminary experience with cardiac reconstruction using decellularized porcine extracellular matrix scaffold: human applications in congenital heart disease.  

PubMed

An ideal material for repair of congenitally malformed hearts would encourage tissue regeneration with growth potential. Decellularized porcine small intestinal submucosa extracellular matrix (SIS-ECM) promotes tissue regeneration in animal models and noncardiac human applications. This retrospective review evaluates SIS-ECM for reconstruction of congenital heart defects. From June 2007 to May 2009, SIS-ECM patches were used in 43 operations on 40 patients aged 2 days to 13 years. In 16 cases, the SIS-ECM was used for pericardial closure. The SIS-ECM was used for cardiac or great vessel repair in 37 cases: atrial septal defect repair in 11, pulmonary arterioplasty in 10, right ventricular outflow tract patch in 6, pulmonary monocusp valve creation in 5, superior vena cava patch in 2 and aortoplasty in 2, valve leaflet augmentation in 2, and repair of unroofed coronary sinus in 1. Follow-up was complete. There were 5 deaths, all unrelated to the SIS-ECM. Mean follow-up was 7.85 months (0.5-24 months). No pericardial effusions or intracardiac or intravascular thromboses occurred related to the SIS-ECM. The patches did not shrink or calcify. Four of 5 monocusp valves were competent and none were stenotic. One patient who underwent tricuspid valve anterior leaflet augmentation with SIS-ECM required tricuspid valve replacement 4 months later for severe regurgitation following a catheter-based procedure. Explanted tissue showed resorption of the SIS-ECM, replacement with organized collagen, and re-endothelialization. Repair of congenital heart defects using SIS-ECM is feasible and safe. In valve reconstruction, this procedure shows potential for replacement by autologous tissue. Longer-term follow-up is required to assess the potential for growth. PMID:23804734

Scholl, Frank G; Boucek, Mark M; Chan, Kak-Chen; Valdes-Cruz, Lilliam; Perryman, Richard

2010-04-01

218

Application of a matrix-fracture transfer pseudofunction in geothermal reservoir simulation  

Microsoft Academic Search

A fine-grid, single porosity model of a matrix-fracture system was used to visualize the pressure response and mass transfer mechanisms in a vapor-dominated geothermal reservoir. The observed pressure response and saturation distributions were used to generate a pseudofunction representing the product of vapor phase relative permeability and matrix-fracture transfer shape factor for a dual-porosity model. The pseudofunction was found to

K. T. Lim; K. L. Enedy; K. K. Bloomfield; K. Aziz

1992-01-01

219

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

220

Flight Dynamics Application of a New Symbolic Matrix Order-Reduction Algorithm  

Microsoft Academic Search

In the field of control, the basis of state-space theory is the representation of a system in a matrix-like form and its subsequent manipulation for synthesis and analysis. The state-space model represents any system, given by nonlinear first-order ordinary differential equations (ODE), as a 2 2 block matrix _ x y = A B C D x u using state

Andrés Marcos; Declan G. Bates; Ian Postlethwaite

221

Application research of ferrous matrix composites in roller ring used in high-speed wire\\/bar rolling mill  

Microsoft Academic Search

Tungsten carbide particle (WCP) reinforced ferrous matrix composites roller rings were fabricated by centrifugal casting. The microstructures, properties and application effect of the composites roller rings were investigated by SEM, TEM and various property testers. The experimental results show that the WCP were uniformly distributed in outer reinforced-layer (working-layer) of 20–50mm in thickness and their volume fraction reached 60–80vol.%; there

Yanpei Song; Xiuqing Li; Shuangxu Bi

2010-01-01

222

Econometric applications of positive rank-one modifications of the symmetric factorization of a positive semi-definite matrix  

Microsoft Academic Search

.   We present an algorithm for updating the symmetric factorization of a positive semi-definite matrix after a positive rank-one\\u000a modification, which works even if the matrices involved do not have full rank. Recursive least squares and factor analysis\\u000a provide two important econometric applications. An illustrative simulation shows that it can be potentially very useful in\\u000a recursive situations.

Enrique Sentana

1999-01-01

223

NOAA Operational Model Archive Distribution System (NOMADS): High Availability Applications for Reliable Real Time Access to Operational Model Data  

NASA Astrophysics Data System (ADS)

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 dissemination at its Web Operations Center (WOC) server. The WOC is a web service used by organizational units in and outside NOAA, and acts as a data repository where public information can be posted to a secure and scalable content server. A goal is to foster collaborations among the research and education communities, value added retailers, and public access for science and development efforts aimed at advancing modeling and GEO-related tasks. The user (client) executes what is efficient to execute on the client and the server efficiently provides format independent access services. Client applications can execute on the server, if it is desired, but the same program can be executed on the client side with no loss of efficiency. In this way this paradigm lends itself to aggregation servers that act as servers of servers listing, searching catalogs of holdings, data mining, and updating information from the metadata descriptions that enable collections of data in disparate places to be simultaneously accessed, with results processed on servers and clients to produce a needed answer. The services used to access the operational model data output are the Open-source Project for a Network Data Access Protocol (OPeNDAP), implemented with the Grid Analysis and Display System (GrADS) Data Server (GDS), and applications for slicing, dicing and area sub-setting the large matrix of real time model data holdings. This approach insures an efficient use of computer resources because users transmit/receive only the data necessary for their tasks including metadata. Data sets served in this way with a high availability server offer vast possibilities for the creation of new products for value added retailers and the scientific community. We demonstrate how users can use NOMADS services to select the values of Ensemble model runs over the ith Ensemble component, (forecast) time, vertical levels, global horizontal location, and by variable, virtually a 6-Dimensional data cube of access across the internet. The example application called the “Ensemble Probability Tool” make probability predictions of user defined weather events that can be used in remote areas for weather vulnerable circumstances. An application to access data for a verification pilot study is shown in detail in a companion paper (U06) collaboration with the World Bank and is an example of high value, usability and relevance of NCEP products and service capability over a wide spectrum of user and partner needs.

Alpert, J. C.; Wang, J.

2009-12-01

224

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.

225

Rotordynamic analysis using the Complex Transfer Matrix: An application to elastomer supports using the viscoelastic correspondence principle  

NASA Astrophysics Data System (ADS)

Numerous methods are available to calculate rotordynamic whirl frequencies, including analytic methods, finite element analysis, and the transfer matrix method. The typical real-valued transfer matrix (RTM) suffers from several deficiencies, including lengthy computation times and the inability to distinguish forward and backward whirl. Though application of complex coordinates in rotordynamic analysis is not novel per se, specific advantages gained from using such coordinates in a transfer matrix analysis have yet to be elucidated. The present work employs a complex coordinate redefinition of the transfer matrix to obtain reduced forms of the elemental transfer matrices in inertial and rotating reference frames, including external stiffness and damping. Application of the complex-valued state variable redefinition results in a reduction of the 8×8 RTM to the 4×4 Complex Transfer Matrix (CTM). The CTM is advantageous in that it intrinsically separates forward and backward whirl, eases symbolic manipulation by halving the transfer matrices’ dimension, and provides significant improvement in computation time. A symbolic analysis is performed on a simple overhung rotor to demonstrate the mathematical motivation for whirl frequency separation. The CTM's utility is further shown by analyzing a rotordynamic system supported by viscoelastic elastomer rings. Viscoelastic elastomer ring supports can provide significant damping while reducing the cost and complexity associated with conventional components such as squeeze film dampers. The stiffness and damping of a viscoelastic damper ring are determined herein as a function of whirl frequency using the viscoelastic correspondence principle and a constitutive fractional calculus viscoelasticity model. The CTM is then employed to obtain the characteristic equation, where the whirl frequency dependent stiffness and damping of the elastomer supports are included. The Campbell diagram is shown, demonstrating the CTM's ability to intrinsically separate synchronous whirl direction for a non-trivial rotordynamic system. Good agreement is found between the CTM results and previously obtained analytic and experimental results for the elastomer ring supported rotordynamic system.

Varney, Philip; Green, Itzhak

2014-11-01

226

An operational global ocean forecast system and its applications  

NASA Astrophysics Data System (ADS)

A global Real-Time Ocean Forecast System (RTOFS) was implemented in operations at NCEP/NWS/NOAA on 10/25/2011. This system is based on an eddy resolving 1/12 degree global HYCOM (HYbrid Coordinates Ocean Model) and is part of a larger national backbone capability of ocean modeling at NWS in strong partnership with US Navy. The forecast system is run once a day and produces a 6 day long forecast using the daily initialization fields produced at NAVOCEANO using NCODA (Navy Coupled Ocean Data Assimilation), a 3D multi-variate data assimilation methodology. As configured within RTOFS, HYCOM has a horizontal equatorial resolution of 0.08 degrees or ~9 km. The HYCOM grid is on a Mercator projection from 78.64 S to 47 N and north of this it employs an Arctic dipole patch where the poles are shifted over land to avoid a singularity at the North Pole. This gives a mid-latitude (polar) horizontal resolution of approximately 7 km (3.5 km). The coastline is fixed at 10 m isobath with open Bering Straits. This version employs 32 hybrid vertical coordinate surfaces with potential density referenced to 2000 m. Vertical coordinates can be isopycnals, often best for resolving deep water masses, levels of equal pressure (fixed depths), best for the well mixed unstratified upper ocean and sigma-levels (terrain-following), often the best choice in shallow water. The dynamic ocean model is coupled to a thermodynamic energy loan ice model and uses a non-slab mixed layer formulation. The forecast system is forced with 3-hourly momentum, radiation and precipitation fluxes from the operational Global Forecast System (GFS) fields. Results include global sea surface height and three dimensional fields of temperature, salinity, density and velocity fields used for validation and evaluation against available observations. Several downstream applications of this forecast system will also be discussed which include search and rescue operations at US Coast Guard, navigation safety information provided by OPC using real time ocean model guidance from Global RTOFS surface ocean currents, operational guidance on radionuclide dispersion near Fukushima using 3D tracers, boundary conditions for various operational coastal ocean forecast systems (COFS) run by NOS etc.

Mehra, A.; Tolman, H. L.; Rivin, I.; Rajan, B.; Spindler, T.; Garraffo, Z. D.; Kim, H.

2012-12-01

227

Interdisciplinary matrix in economics: two applications to the transition from socialism to capitalism.  

PubMed

The 7-fold interdisciplinary matrix is introduced. This integrated methodological point of view is original, although it is based on ideas of others in various ways. The name for this new approach draws on the Kuhnian notion of a disciplinary matrix. There are four components of the Kuhnian matrix on which the existence of scientific communities hinges: symbolic generalizations, models, values, and exemplars. In this context the term "paradigm" should refer to exemplars. The interdisciplinary matrix is composed of seven elements: cybernetics, catastrophe theory, fractal geometry, deterministic chaos, artificial intelligence, theory of complexity, and humanistic values. Scientific developments have recently brought substantial changes in the structure of scientific communities. Transferability of ideas and thoughts contributed to the creation of scientific communities, which unite representatives of various professions. When researching into certain phenomena we no longer need to develop theories for them from scratch, as we can draw on the achievements in other disciplines. Two examples of the employment of the interdisciplinary matrix in macroeconomics are elaborated here: the investment cycle model in socialist economy, and the model of economic transformation based on chaotic hysteresis. PMID:19781137

Jakimowicz, Aleksander

2009-10-01

228

Application of Heisenberg's S matrix program to the angular scattering of the state-to-state F + H2 reaction.  

PubMed

This paper makes two applications of Heisenberg's S matrix program (HSMP) to the differential cross section (DCS) of the benchmark reaction F + H2(vi = 0, ji = 0, mi = 0) ? FH(vf = 3, jf = 3, mf = 0) + H, at a relative translational energy of 0.119 eV (total energy, 0.3872 eV), where v, j, m are vibrational, rotational, and helicity quantum numbers, respectively, for the initial and final states. (1) The first application employs a "weak" version of HSMP in which no potential energy surface (PES) is employed. It uses four simple S matrix parametrizations, two of which are piecewise continuous, and two are piecewise discontinuous, developed earlier by X. Shan and J. N. L. Connor (J. Phys. Chem. A 2012, 116, 11414-11426) for the state-to-state H + D2 reaction. We find that the small-angle DCS is reproduced for only ?R ? 10° when compared with the DCS for a numerical S matrix obtained in a large-scale quantum scattering computation using a PES. Here ?R is the reactive scattering angle. (2) In our second application, we ask the question "Can simple modifications to the parametrized S matrix be made in order to extend the agreement to larger angles?" To answer this question, we adopt a "hybrid" version of HSMP, as outlined by Shan and Connor (Phys. Chem. Chem. Phys. 2011, 13, 8392-8406), which indirectly uses PES information. We make simple Gaussian-type modifications to both the modulus and argument of the S matrix. We then obtain agreement between the DCSs for the modified and numerical S matrices up to ?R ? 70°, a significant improvement compared with ?R ? 10° for the unmodified parametrizations. We find that modifying the argument but not the modulus, or modifying the modulus but not the argument, fails to extend the agreement to larger angles. A semiclassical analysis is used to prove that the enhanced small-angle scattering for the "modified-modulus-modified-argument" parametrized S matrix is an example of a forward glory. PMID:24844325

Shan, Xiao; Connor, J N L

2014-08-21

229

GIS applications for military operations in coastal zones  

USGS Publications Warehouse

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. Static products in the form of analog maps at varying scales traditionally have been used by military commanders and their operational planners. The rapidly changing battlefield of 21st Century warfare, however, demands dynamic mapping solutions. Commercial geographic information system (GIS) software for military-specific applications is now being developed and employed with digital databases to provide customized digital maps of variable scale, content and symbolization tailored to unique demands of military units. Research conducted by the Center for Remote Sensing and Mapping Science at the University of Georgia demonstrated the utility of GIS-based analysis and digital map creation when developing large-scale (1:10,000) products from littoral warfare databases. The methodology employed-selection of data sources (including high resolution commercial images and Lidar), establishment of analysis/modeling parameters, conduct of vehicle mobility analysis, development of models and generation of products (such as a continuous sea-land DEM and geo-visualization of changing shorelines with tidal levels)-is discussed. Based on observations and identified needs from the National Geospatial-Intelligence Agency, formerly the National Imagery and Mapping Agency, and the Department of Defense, prototype GIS models for military operations in sea, land and air environments were created from multiple data sets of a study area at US Marine Corps Base Camp Lejeune, North Carolina. Results of these models, along with methodologies for developing large-scale littoral warfare databases, aid the National Geospatial-Intelligence Agency in meeting littoral warfare analysis, modeling and map generation requirements for US military organizations. ?? 2008 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS).

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

2009-01-01

230

Theory and implementation of the MBPT density matrix. An application to one-electron properties  

NASA Astrophysics Data System (ADS)

A perturbation-independent response density matrix has been derived and implemented for many-body perturbation theory. This density contains all orbital relaxation terms, which allows for fast, efficient computation of correlated one-electron response properties. As such, it eliminates the need for finite-field calculations of first-order properties. The method is applied to H 2O using an extended basis set for the MBPT (2), MBPT (3), and SDQ-MBPT (4) levels of theory. The relationship of the response density to an average density matrix is discussed.

Trucks, Gary W.; Salter, E. A.; Sosa, Carlos; Bartlett, Rodney J.

1988-06-01

231

Clinical application and long-term follow-up study of porcine acellular dermal matrix combined with autoskin grafting.  

PubMed

The purpose of this study was to investigate the clinical effects of porcine acellular dermal matrix combined with autoskin grafting on full-thickness skin defects using long-term clinical follow-up study and histologic examination. One hundred fifty-two patients with deep burn or trauma hospitalized from February 2000 to July 2003 were repaired with porcine acellular dermal matrix and split-thickness autoskin graft. Take rate of the grafts was calculated on 1 week after operation. Scar hyperplasia was examined on 1, 3, 6, and 12 months after operation. At the same time, the contracture rates of grafted areas were also calculated. Skin biopsy was performed on five patients for histologic examination, as well as transmission electron microscopy 78 months after operation. The take rate of grafts of 116 patients (76.3%) was 100%, and the take rate of the rest of the patients (36 patients, 23.7%) was more than 95%. No one needed skin transplantation for the second time. One hundred twenty-seven patients were followed up on 1 month after operation; grafts showed mild contraction. There was slight cicatricle at skin junction with tender texture. There was no obvious pruritus and blister. One hundred one patients were followed up on 3 months after operation. The graft contraction showed obvious relief with good articular function. Eighty-two patients were followed up on 6 months after operation. The color and texture of the grafts were similar to normal skin without obvious cicatricial hyperplasia. Fifty-eight patients were followed up on 12 months after operation. The grafts were similar to normal skin without obvious rejection. There were no significant differences between the contracture rates at 3, 6, and 12 months and 1 month after the second surgery. Sixteen patients were followed up on 78 months after operation. The appearance of grafts was slightly dry compared with normal skin. Tissue structure of grafts was similar to normal skin with sweat gland-like structure, and sweat gland cells were shown in the dermis. Xenogenic acellular dermal matrix combined with split-thickness autograft can repair full-thickness skin defects and inhibit scar proliferation without obvious immune rejection for long time. Newly formed sweat gland-like structure and sweat gland cells in the dermis may be a new research point for reconstruction of skin function. PMID:20182383

Jiong, Chen; Jiake, Chai; Chunmao, Han; Yingen, Pan; Qiuhe, Wu; Zhouxi, Fang; Xiangsheng, Feng

2010-01-01

232

T-Matrix Method and its Applications to Electromagnetic Scattering by Particles: A Current Perspective  

NASA Technical Reports Server (NTRS)

This note serves as a short introduction to the reprint of our article "T-matrix computations of light scattering by nonspherical particles: a review" (JQSRT 1996; 55:535:75). We first discuss the motivation for writing that article and explain its historical context. This is followed by a short overview of more recent developments.

Mishchenko, Michael I.; Travis, Larry D.; Mackowski, Daniel W.

2010-01-01

233

A Delphi-matrix approach to SEA and its application within the tourism sector in Taiwan  

SciTech Connect

Strategic Environmental Assessment (SEA) is a procedural tool and within the framework of SEA, several different types of analytical methods can be used in the assessment. However, the impact matrix used currently in Taiwan has some disadvantages. Hence, a Delphi-matrix approach to SEA is proposed here to improve the performance of Taiwan's SEA. This new approach is based on the impact matrix combination with indicators of sustainability, and then the Delphi method is employed to collect experts' opinions. In addition, the assessment of National Floriculture Park Plan and Taiwan Flora 2008 Program is taken as an example to examine this new method. Although international exhibition is one of the important tourism (economic) activities, SEA is seldom about tourism sector. Finally, the Delphi-matrix approach to SEA for tourism development plan is established containing eight assessment topics and 26 corresponding categories. In summary, three major types of impacts: resources' usages, pollution emissions, and local cultures change are found. Resources' usages, such as water, electricity, and natural gas demand, are calculated on a per capita basis. Various forms of pollution resulting from this plan, such as air, water, soil, waste, and noise, are also identified.

Kuo, N.-W. [Graduate Institute of Tourism and Health Science, National Taipei College of Nursing, Taiwan (China)]. E-mail: ibis@ntcn.edu.tw; Hsiao, T.-Y. [Department of Tourism Industry, Jin-Wen Institute of Technology, Taiwan (China); Yu, Y.-H. [Graduate Institute of Environmental Engineering, National Taiwan University, Taiwan (China)

2005-04-15

234

Torsional velocity measurements in wire, with application to metal-matrix composites  

NASA Astrophysics Data System (ADS)

A technique is described for measuring torsional wave velocity in (nonferromagnetic) wire with diameters of less than 1 mm. Transduction is noncontacting, via Lorentz forces acting across a gap between transducer and wire, so that velocity can be ''scanned'' along the length of the wire. A double-receiver approach permits the scan to be made in a ''point-by-point'' fashion. The wires are a metal-matrix composite of 6061 aluminum and pitch mesophase graphite. Some data are presented, together with a discussion of the effects of metal-matrix-composite parameters, such as graphite content and porosity, on torsional velocity. An extrapolation of our metal-matrix- composite data yields a value for c44, of the graphite fiber, that was within 1% of a value determined from data of Fischbach and Scrinivasagopalan. Good predictions of experimental results were obtained through use of theory of Hashin and of Achenbach and Herrmann. Some differences, and their implications, between torsional and longitudinal waves propagating in metal-matrix-composite wire are described.

Frost, H. M.; Prout, J. H.; Reed, Robert W.

1982-06-01

235

A NEW MULTIDIMENSIONAL MATRIX INVERSE WITH APPLICATIONS TO MULTIPLE qSERIES  

E-print Network

KRATTENTHALER y AND MICHAEL SCHLOSSER y Institut f¨ur Mathematik der Universit¨at Wien, Strudlhofgasse 4, A­1090], [28], [29], [30]. This study culminated in the important discovery, jointly with Hsu, of a very y #12; 2 CHRISTIAN KRATTENTHALER AND MICHAEL SCHLOSSER general matrix inversion [32], which contained

Krattenthaler, Christian

236

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

237

FAST INCREMENTAL METHOD FOR MATRIX COMPLETION: AN APPLICATION TO TRAJECTORY CORRECTION  

E-print Network

a fast and incremental algorithm which is able to cope with out- liers. We present experiments showing/EEA-CRO/098822/2008. (SPOC), iteratively completes the matrix while enforcing the obtained result to be as close to rank-4 as possible. SPOC is optimal, as long as the occlusion pattern follows a Young dia- gram, i

Instituto de Sistemas e Robotica

238

Exploiting discriminant information in nonnegative matrix factorization with application to frontal face verification  

Microsoft Academic Search

Abstract In this paper, two supervised methods for enhancing the classification accuracy of the Non- negative Matrix Factorization (NMF) algorithm are presented. The idea is to extend the NMF algorithm in order to extract features that enforce not only the spatial locality, but also the separability between,classes in a discriminant manner. The first method,em ploys discriminant analysis in the features

Stefanos Zafeiriou; Anastasios Tefas; Ioan Buciu; Ioannis Pitas

2006-01-01

239

APPLICATION OF MATRIX ISOLATION INFRARED SPECTROSCOPY TO ANALYSIS FOR POLYNUCLEAR AROMATIC HYDROCARBONS IN ENVIRONMENTAL SAMPLES  

EPA Science Inventory

Gas chromatography combined with matrix isolation infrared spectroscopy (GC/MI-IR) enables identification and quantification of components of complex mixtures by infrared spectroscopy at levels of a few nanograms. These levels are several orders of magnitude lower than those achi...

240

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

2012-01-01

241

Continuous SiC fiber, CVI SiC matrix composites for nuclear applications: Properties and irradiation effects  

NASA Astrophysics Data System (ADS)

Silicon carbide (SiC) continuous fiber-reinforced, SiC-matrix composites (SiC/SiC composites) are industrially available materials that are promising for applications in nuclear environments. The SiC/SiC composites consisting of near-stoichiometric SiC fibers, stoichiometric and fully crystalline SiC matrices, and the pyrocarbon (PyC) or multilayered PyC/SiC interphase between the fiber and the matrix are considered particularly resistant to very high radiation environments. This paper provides a summary compilation of the properties of these composites, specifically those with the chemically vapor-infiltrated (CVI) SiC matrices, including newly obtained results. The properties discussed are both in unirradiated condition and after neutron irradiation to intermediate fluence levels (most data are for

Katoh, Yutai; Ozawa, Kazumi; Shih, Chunghao; Nozawa, Takashi; Shinavski, Robert J.; Hasegawa, Akira; Snead, Lance L.

2014-05-01

242

Integrating Matrix Method for Determining the Natural Vibrations of a Rotating, Unsymmetrical Beam with Application to Twisted Propeller Blades  

NASA Technical Reports Server (NTRS)

A numerical method is Presented for determining the natural vibration frequencies, and the corresponding mode shapes, of a rotating cantilever beam which has a nonuniform, unsymmetrical cross section. Two coupled fourth-order differential equations of motion with variable coefficients are derived which govern the motion of such a beam having deformations in two directions. Through the development and utilization of the integrating matrix, the solution of the differential equations is obtained in the form of an eigenvalue problem. The solutions to the eigenvalue problem are determined by an iteration method based upon a special orthogonality relationship which is derived. Numerical examples, including an application to a twisted propeller blade, are presented with the results of the integrating matrix solutions being compared to exact solutions and experimental data.

Hunter, William F.

1967-01-01

243

Two Algorithms for Orthogonal Nonnegative Matrix Factorization with Application to Clustering  

E-print Network

Approximate matrix factorization techniques with both nonnegativity and orthogonality constraints, referred to as orthogonal nonnegative matrix factorization (ONMF), have been recently introduced and shown to work remarkably well for clustering tasks such as document classification. In this paper, we introduce two new methods to solve ONMF. First, we show mathematical equivalence between ONMF and a weighted variant of spherical $k$-means, from which we derive our first method, a simple EM-like algorithm. Our second method is based on an augmented Lagrangian approach. Standard ONMF algorithms typically enforce nonnegativity for their iterates while trying to achieve orthogonality at the limit (e.g., using a proper penalization term or a suitably chosen search direction). Our method works the opposite way: orthogonality is strictly imposed at each step while nonnegativity is asymptotically obtained, using a quadratic penalty. Finally, we show that the two proposed approaches compare favorably with standard ONMF...

Pompili, Filippo; Absil, P -A; Glineur, François

2012-01-01

244

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

PubMed

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 circumflexX = sigma(k=1)(K) d(k)u(k)v(k)(T), where d(k), u(k), and v(k) minimize the squared Frobenius norm of X - circumflexX, subject to penalties on u(k) and v(k). This results in a regularized version of the singular value decomposition. Of particular interest is the use of L(1)-penalties on u(k) and v(k), which yields a decomposition of X using sparse vectors. We show that when the PMD is applied using an L(1)-penalty on v(k) but not on u(k), 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. PMID:19377034

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

2009-07-01

245

Heteropoly acids immobilized into a silica matrix: characterization and catalytic applications  

Microsoft Academic Search

Four dodecaheteropoly acids of the Keggin-type (Hn[XM12O40]; n=3, 4; X=Si, P; M=Mo, W) were immobilized into a silica matrix by means of a sol–gel technique. It was shown by ammonia thermodesorption that W-containing samples possess higher acidity than their Mo-containing counterparts which is in agreement with previous results for the neat acids. These silica-included heteropoly acids proved to be effective

Árpád Molnár; Csilla Keresszegi; Béla Török

1999-01-01

246

Some Applications of the Newton-Raphson Method to Non-Linear Matrix Problems  

Microsoft Academic Search

If D(lambda) is a lambda-matrix the latent roots are defined as the roots, lambda_i, of the equation |D(lambda)| = 0, and the eigenvalues are defined as the roots, mu_j(lambda), of |D-mu I| = 0. It is shown that mu_j(lambda) = 0 for some j if and only if lambda is a latent root, and it is shown that the Newton-Raphson

P. Lancaster

1963-01-01

247

Mixed matrix membrane application for olive oil wastewater treatment: process optimization based on Taguchi design method.  

PubMed

Olive oil mill wastewater (OMW) is a concentrated effluent with a high organic load. It has high levels of organic chemical oxygen demand (COD) and phenolic compounds. This study presents a unique process to treat OMW. The process uses ultrafiltration (UF) membranes modified by a functionalized multi wall carbon nano-tube (F-MWCNT). The modified tube has an inner diameter of 15-30 nm and is added to the OMW treatment process to improve performance of the membrane. Tests were done to evaluate the following operating parameters of the UF system; pressure, pH and temperature; also evaluated parameters of permeate flux, flux decline, COD removal and total phenol rejection. The Taguchi robust design method was applied for an optimization evaluation of the experiments. Variance (ANOVA) analysis was used to determine the most significant parameters affecting permeate flux, flux decline, COD removal and total phenols rejection. Results demonstrated coagulation and pH as the most important factors affecting permeate flux of the UF. Moreover, pH and F-MWCNT UF had significant positive effects on flux decline, COD removal and total phenols rejection. Based on the optimum conditions determined by the Taguchi method, evaluations for permeate flux tests; flux decline, COD removal and total phenols rejection were about 21.2 (kg/m(2) h), 12.6%, 72.6% and 89.5%, respectively. These results were in good agreement with those predicted by the Taguchi method (i.e.; 22.8 (kg/m(2) h), 11.9%, 75.8 and 94.7%, respectively). Mechanical performance of the membrane and its application for high organic wastewater treatment were determined as strong. PMID:24291584

Zirehpour, Alireza; Rahimpour, Ahmad; Jahanshahi, Mohsen; Peyravi, Majid

2014-01-01

248

Application of the transfer matrix for tuning the CSNS-DTL  

NASA Astrophysics Data System (ADS)

In the construction of a drift tube LINAC (DTL), many factors caused during the fabrication and assembly of the structure cells cause the electric field distribution not as the same as the design curve. To solve this problem, the traditional way is to solve the equation of Slater's perturbation theorem to obtain the electrical field variation due to local frequency shift. However, that is very difficult under complicated conditions. Since the field perturbation equation is similar to the particle's transverse motion equation, which can be simply solved by using the transfer matrix method, we thus propose to apply a transfer matrix method in tuning the DTL. We demonstrate the availability and advantages of this method with 3D microwave code simulation and the LabVIEW calculation program. After two iterations, the initial error of the electric field of 19.5% has been improved greatly down to 1.3%-4.5%. This indicates that the transfer matrix method is very useful and convenient for the simplification of tuning procedures.

Li, A.-Hong; Yin, Xue-Jun; Fu, Shi-Nian; Sun, Zhi-Rui

2011-10-01

249

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

2009-09-10

250

Matrix differentiation formulas  

NASA Technical Reports Server (NTRS)

A compact differentiation technique (without using indexes) is developed for scalar functions that depend on complex matrix arguments which are combined by operations of complex conjugation, transposition, addition, multiplication, matrix inversion and taking the direct product. The differentiation apparatus is developed in order to simplify the solution of extremum problems of scalar functions of matrix arguments.

Usikov, D. A.; Tkhabisimov, D. K.

1983-01-01

251

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

252

75 FR 33365 - Entergy Nuclear Operations, Inc.; Notice of Withdrawal of Application for Amendment to Facility...  

Federal Register 2010, 2011, 2012, 2013

...has granted the request of Entergy Nuclear Operations, Inc. (ENO) (the licensee) to withdraw its August 28, 2008, application...and Section 5.6.5 Core Operating Limits Report (COLR). ENO supplemented the License Amendment Request by letter dated...

2010-06-11

253

Assessment of Erosion Resistance of Coated Polymer Matrix Composites for Propulsion Applications  

NASA Technical Reports Server (NTRS)

The erosion behavior of tungsten carbide-cobalt (WC-Co) coated and uncoated polymer matrix composites (PMCs) was examined with solid particle impingement using air jets. Erosion tests were conducted with Arizona road dust impinging at 20 degrees, 60 degrees, and 90 degrees angles at a velocity of 229 meters per second at both 294 and 366 K. Noncontact optical profilometry was used to measure the wear volume loss. Results indicate that the WC-Co coating enhanced erosion resistance and reduced erosion wear volume loss by a factor of nearly 2. This should contribute to longer wear lives, reduced related breakdowns, decreased maintenance costs, and increased product reliability.

Miyoshi, Kazuhisa; Sutter, James K.; Horan, Richard A.; Naik, Subhash K.; Cupp, Randall J.

2004-01-01

254

Application of the extended Jones matrix formalism for higher-order transverse modes to laser resonators.  

PubMed

The extension of the Jones matrix formalism to higher-order transverse modes using N x N matrices presented in a previous paper [8] is applied to laser resonators. The resonator discussed in detail has a TEM(01)* Hermite-Gaussian mode, an axially symmetric polarizer combined with an axially symmetric phase shifter as a rear mirror and a folding mirror with conventional polarization dependent reflectivity and phase shift. The analysis reveals some useful regimes, where the output polarization is close to radial or azimuthal and the sensitivity to variations in the phase shift of the folding mirror is minimized. PMID:20941051

Voss, Andreas; Abdou-Ahmed, Marwan; Graf, Thomas

2010-10-11

255

14 CFR 119.35 - Certificate application requirements for all operators.  

Code of Federal Regulations, 2010 CFR

(a) A person applying to the Administrator for an Air Carrier Certificate or Operating Certificate under this part (applicant) must submit an application— (1) In a form and manner prescribed by the Administrator;...

2010-01-01

256

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

257

Research and application of embedded real-time operating system  

NASA Astrophysics Data System (ADS)

In this paper, based on the analysis of existing embedded real-time operating system, the architecture of an operating system is designed and implemented. The experimental results show that the design fully complies with the requirements of embedded real-time operating system, can achieve the purposes of reducing the complexity of embedded software design and improving the maintainability, reliability, flexibility. Therefore, this design program has high practical value.

Zhang, Bo

2013-03-01

258

Three-Dimensional Supermacroporous Carrageenan-Gelatin Cryogel Matrix for Tissue Engineering Applications  

PubMed Central

A tissue-engineered polymeric scaffold should provide suitable macroporous structure similar to that of extracellular matrix which can induce cellular activities and guide tissue regeneration. Cryogelation is a technique in which appropriate monomers or polymeric precursors frozen at sub-zero temperature leads to the formation of supermacroporous cryogel matrices. In this study carrageenan-gelatin (natural polymers) cryogels were synthesized by using glutaraldehyde and 1-ethyl-3-[3-dimethylaminopropyl] carbodiimide hydrochloride and N-hydroxysuccinimide (EDC-NHS) as crosslinking agent at optimum concentrations. Matrices showed large and interconnected pores which were in the range of 60–100??m diameter. Unconfined compression analysis showed elasticity and physical integrity of all cryogels, as these matrices regained their original length after 90% compressing from the original size. Moreover Young's modulus was found to be in the range of 4–11?kPa for the dry cryogel sections. These cryogels also exhibited good in vitro degradation capacity at 37 °C within 4 weeks of incubation. Supermacroporous carrageenan-gelatin cryogels showed efficient cell adherence and proliferation of Cos-7 cells which was examined by SEM. PI nuclear stain was used to observe cell-matrix interaction. Cytotoxicity of the scaffolds was checked by MTT assay which showed that cryogels are biocompatible and act as a potential material for tissue engineering and regenerative medicine. PMID:23936806

Sharma, Archana; Bhat, Sumrita; Vishnoi, Tanushree; Nayak, Vijayashree; Kumar, Ashok

2013-01-01

259

The Matrix Element Method and its Application to Measurements of the Top Quark Mass  

E-print Network

The most precise measurements of the top quark mass are based on the Matrix Element method. We present a detailed description of this analysis method, taking the measurements of the top quark mass in final states with one and two charged leptons as concrete examples. In addition, we show how the Matrix Element method is suitable to reduce the dominant systematic uncertainties related to detector effects, by treating the absolute energy scales for b-quark and light-quark jets independently as free parameters in a simultaneous fit together with the top quark mass. While the determination of the light-quark jet energy scale has already been applied in several recent measurements, the separate determination of the absolute b-quark jet energy scale is a novel technique with the prospect of reducing the overall uncertainty on the top quark mass in the final measurements at the Tevatron and in analyses at the LHC experiments. The procedure is tested on Monte Carlo generated events with a realistic detector resolution.

Frank Fiedler; Alexander Grohsjean; Petra Haefner; Philipp Schieferdecker

2010-03-05

260

Medical Applications of White LEDs for Surgical Operation  

Microsoft Academic Search

Everywhere in the world, the highest quality and quantity of lighting is required during the surgical operations. However, the surgical approach has had many types and various angles, common ceiling surgical halogen lighting system cannot provide an adequate amount of beams because the surgeons' heads hinder the illuminations from reaching the operation field. The evolution of solid-state-lighting is currently going

Junichi Shimada; Yoichi Kawakami

2005-01-01

261

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

262

Exploiting discriminant information in nonnegative matrix factorization with application to frontal face verification.  

PubMed

In this paper, two supervised methods for enhancing the classification accuracy of the Nonnegative Matrix Factorization (NMF) algorithm are presented. The idea is to extend the NMF algorithm in order to extract features that enforce not only the spatial locality, but also the separability between classes in a discriminant manner. The first method employs discriminant analysis in the features derived from NMF. In this way, a two-phase discriminant feature extraction procedure is implemented, namely NMF plus Linear Discriminant Analysis (LDA). The second method incorporates the discriminant constraints inside the NMF decomposition. Thus, a decomposition of a face to its discriminant parts is obtained and new update rules for both the weights and the basis images are derived. The introduced methods have been applied to the problem of frontal face verification using the well-known XM2VTS database. Both methods greatly enhance the performance of NMF for frontal face verification. PMID:16722172

Zafeiriou, Stefanos; Tefas, Anastasios; Buciu, Ioan; Pitas, Ioannis

2006-05-01

263

Concerning an application of the method of least squares with a variable weight matrix  

NASA Technical Reports Server (NTRS)

An estimate of a state vector for a physical system when the weight matrix in the method of least squares is a function of this vector is considered. An iterative procedure is proposed for calculating the desired estimate. Conditions for the existence and uniqueness of the limit of this procedure are obtained, and a domain is found which contains the limit estimate. A second method for calculating the desired estimate which reduces to the solution of a system of algebraic equations is proposed. The question of applying Newton's method of tangents to solving the given system of algebraic equations is considered and conditions for the convergence of the modified Newton's method are obtained. Certain properties of the estimate obtained are presented together with an example.

Sukhanov, A. A.

1979-01-01

264

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

2013-08-14

265

Matrix-vector Product for Con uent Cauchy-like Matrices with Application to Con uent Rational Interpolation  

E-print Network

O(n) of parameters. Operating directly on these parameters allows one to design eÃ?cient fast by itself, its study was motivated by the following application. In a recent paper [18] the authors derived log n otherwise (1.1) the running time of basic polynomial manipulation algorithms

Olshevsky, Vadim

266

Google matrix 1 Google matrix  

E-print Network

Google matrix 1 Google matrix A Google matrix is a particular stochastic matrix that is used by Google's PageRank algorithm. The matrix represents a graph with edges representing links between pages. The rank of each page can be generated iteratively from the Google matrix using the power method. However

Shepelyansky, Dima

267

Google matrix 1 Google matrix  

E-print Network

Google matrix 1 Google matrix Fig.1. Google matrix of Wikipedia articles network, written [19]) A Google matrix is a particular stochastic matrix that is used by Google's PageRank algorithm be generated iteratively from the Google matrix using the power method. However, in order for the power method

Shepelyansky, Dima

268

Biologically motivated operator and its application to detecting intensity spots  

Microsoft Academic Search

We present a new operator, named the normalized negative Laplacian of Gaussian (NNLoG) operator to model the centre-surround mechanism of biological vision. We proved in mathematically that the NNLoG is invariant to scale. A computational scheme for selective detection of intensity spots is proposed. To detect intensity spots of specific size, the algorithm uses only one NNLoG of appropriate size.

You Li; Zhihui Lei

2008-01-01

269

EOS: a real-time operating system adapts to application architectures  

Microsoft Academic Search

Rather than dictating the architecture of application software and hardware, a real-time operating system should be flexible enough to adapt to the application's needs. The EOS real-time operating system provides a modular, scalable software platform users can tailor to specific custom hardware architectures. Developers can use minimum configurations of EOS for simple systems or enhance it with their own code

Gianluigi Castelli; G. Ragazzini

1995-01-01

270

Fast and Robust Computation of the Matrix Absolute Value Function. Application to Roe Solver for the Numerical Simulation of Two-Phase Flow Models  

Microsoft Academic Search

The application of the generalized Roe scheme to the numerical simulation of two-phase flow models requires a fast and robust computation of the absolute value of the system matrix. In several models such as the two-fluid model or a general multi-field model, this matrix has a non trivial Eigen-structure and the Eigen decomposition is often ill conditioned. We give two

Michael Ndjinga; Anela Kumbaro; Pascal Laurent-Gengoux; Florian De Vuyst

2006-01-01

271

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

Code of Federal Regulations, 2013 CFR

...2013-10-01 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....

2013-10-01

272

40 CFR 63.5734 - What standards must I meet for resin and gel coat application equipment cleaning operations?  

Code of Federal Regulations, 2010 CFR

...What standards must I meet for resin and gel coat application equipment cleaning operations...Manufacturing Standards for Resin and Gel Coat Application Equipment Cleaning Operations...What standards must I meet for resin and gel coat application equipment cleaning...

2010-07-01

273

The OCLC Network: Its Architecture, Application, and Operation.  

ERIC Educational Resources Information Center

This overview of the OCLC telecommunications network discusses: its scope and applications, user demographics, the system architecture, access, costs, protocols, maintenance, vendor relationships, performance data, and network engineering. (13 references) (MES)

Learn, Larry L.; Carpenter, George L.

1988-01-01

274

High Availability Applications for NOMADS at the NOAA Web Operations Center Aimed at Providing Reliable Real Time Access to Operational Model Data  

NASA Astrophysics Data System (ADS)

The NOAA Operational Modeling Archive Distribution System (NOMADS) is now delivering high availability services as part of NOAA's official real time data dissemination at its Web Operations Center (WOC). The WOC is a web service used by all organizational units in NOAA and acts as a data repository where public information can be posted to a secure and scalable content server. A goal is to foster collaborations among the research and education communities, value added retailers, and public access for science and development efforts aimed at advancing modeling and GEO-related tasks. The services used to access the operational model data output are the Open-source Project for a Network Data Access Protocol (OPeNDAP), implemented with the Grid Analysis and Display System (GrADS) Data Server (GDS), and applications for slicing, dicing and area sub-setting the large matrix of real time model data holdings. This approach insures an efficient use of computer resources because users transmit/receive only the data necessary for their tasks including metadata. Data sets served in this way with a high availability server offer vast possibilities for the creation of new products for value added retailers and the scientific community. New applications to access data and observations for verification of gridded model output, and progress toward integration with access to conventional and non-conventional observations will be discussed. We will demonstrate how users can use NOMADS services to repackage area subsets either using repackaging of GRIB2 files, or values selected by ensemble component, (forecast) time, vertical levels, global horizontal location, and by variable, virtually a 6- Dimensional analysis services across the internet.

Alpert, J. C.; Rutledge, G.; Wang, J.; Freeman, P.; Kang, C. Y.

2009-05-01

275

Neutronic aspects of inert matrix fuels for application in ADS J. Wallenius *  

E-print Network

Abstract Accelerator driven systems may operate on uranium or thorium free fuels. In order to guarantee for americium and magnesia the highest burnup potential. Ã? 2003 Elsevier Science B.V. All rights reserved. 1 matter Ã? 2003 Elsevier Science B.V. All rights reserved. doi:10.1016/S0022-3115(03)00181-8 www

276

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

277

The impact of the rank of marker variance-covariance matrix in principal component evaluation for genomic selection applications.  

PubMed

In genomic selection (GS) programmes, direct genomic values (DGV) are evaluated using information provided by high-density SNP chip. Being DGV accuracy strictly dependent on SNP density, it is likely that an increase in the number of markers per chip will result in severe computational consequences. Aim of present work was to test the effectiveness of principal component analysis (PCA) carried out by chromosome in reducing the marker dimensionality for GS purposes. A simulated data set of 5700 individuals with an equal number of SNP distributed over six chromosomes was used. PCs were extracted both genome-wide (ALL) and separately by chromosome (CHR) and used to predict DGVs. In the ALL scenario, the SNP variance-covariance matrix (S) was singular, positive semi-definite and contained null information which introduces 'spuriousness' in the derived results. On the contrary, the S matrix for each chromosome (CHR scenario) had a full rank. Obtained DGV accuracies were always better for CHR than ALL. Moreover, in the latter scenario, DGV accuracies became soon unsettled as the number of animals decreases, whereas in CHR, they remain stable till 900-1000 individuals. In real applications where a 54k SNP chip is used, the largest number of markers per chromosome is approximately 2500. Thus, a number of around 3000 genotyped animals could lead to reliable results when the original SNP variables are replaced by a reduced number of PCs. PMID:22059577

Dimauro, C; Cellesi, M; Pintus, M A; Macciotta, N P P

2011-12-01

278

Java application for the superposition T-matrix code to study the optical properties of cosmic dust aggregates  

E-print Network

In this paper, we report the development of a java application for the Superposition T-matrix code, JaSTA (Java Superposition T-matrix App), to study the light scattering properties of aggregate structures. It has been developed using Netbeans 7.1.2, which is a java integrated development environment (IDE). The JaSTA uses double precession superposition codes for multi-sphere clusters in random orientation developed by Mackowski and Mischenko (1996). It consists of a graphical user interface (GUI) in the front hand and a database of related data in the back hand. Both the interactive GUI and database package directly enable a user to model by self-monitoring respective input parameters (namely, wavelength, complex refractive indices, grain size, etc.) to study the related optical properties of cosmic dust (namely, extinction, polarization, etc.) instantly, i.e., with zero computational time. This increases the efficiency of the user. The database of JaSTA is now created for a few sets of input parameters with...

Halder, P; Roy, P Deb; Das, H S

2014-01-01

279

Influence of hydro-climatic conditions, soil type, and application matrix on potential vadose zone export of PPCPs  

NASA Astrophysics Data System (ADS)

The land-application of biosolids and animal manure to agricultural fields has the potential to negatively impact the quality of nearby surface and subsurface water due to the presence of emerging contaminants in these residuals. We investigated the extent to which the vadose zone acts as a hydrologic and biogeochemical filter of two emerging contaminants, Triclosan (TCS) and estrone (E1) using a coupled source zone and vadose zone modeling approach. Monte Carlo simulations were run for a year following residual applications to explore the following research questions: (1) how does the application matrix (e.g., de-watered solids, liquid lagoon effluent, etc.) affect PPCP mass fluxes?; (2) how do hydro-climatic conditions and soil type affect PPCP mass fluxes?; (3) what role does the presence of macropore pathways play in PPCP export from the vadose zone; and (4) does the long-term, repeated application of residuals affect the ability of the vadose zone to act as an effective biogeochemical filter? The simulations were conducted for a sub-tropical climate with sand (e.g., Florida) and a humid climate with a silty clay loam (e.g., Midwestern United States). Simulation results suggest that the potential mobility of emerging contaminants increases linearly with increasing fraction applied to the mobile phase of the source zone (i.e., higher PPCP mass fraction in the dissolved phase during application). Following a single application, the total amount of PPCP mass exported from the source zone over the course of a year can be as high as 70% in a sub-tropical climate with sand soil. However, these types of soils do not have macropore flow pathways and the annual PPCP mass exported from the vadose zone is less than 1% of the mass applied. The higher organic carbon content in a silty clay loam reduces the amount of PPCP mass released from the source zone to less than 5% of the mass applied. In the presence of macropore pathways, the silty clay loam's vadose zone acts as a less effective biogeochemical filter than the sand's vadose zone. However, following a single application, Monte Carlo simulations suggest that the annual mass exported from the silty clay loam's vadose zone is less than 0.2% of the applied mass. Additionally, simulation results suggest that the mass exported from the vadose zone of the silty clay loam increases with time when fields receive long-term, repeated residual applications. Thus, field studies conducted with single applications likely underestimate mass fluxes exported from fields with a history of applications.

Gall, H. E.; Rao, P.; O'Connor, G.

2013-12-01

280

Leptonic CP violation phases using an ansatz for the neutrino mass matrix and application to leptogenesis  

SciTech Connect

We further study the previously proposed ansatz, Tr(M{sub {nu}})=0, for a prediagonal light Majorana type neutrino mass matrix. If CP violation is neglected this enables one to use the existing data on squared mass differences to estimate (up to a discrete ambiguity) the neutrino masses themselves. If it is assumed that only the conventional CP phase is present, the ansatz enables us to estimate this phase in addition to all three masses. If it is assumed that only the two Majorana CP phases are present, the ansatz enables us to present a one parameter family of solutions for the masses and phases. This enables us to obtain a simple 'global' view of lepton number violation effects. Furthermore using an SO(10) motivation for the ansatz suggests an amusing toy (clone) model in which the heavy neutrinos have the same mixing pattern and mass ratios as the light ones. In this case only their overall mass scale is not known (although it is constrained by the initial motivation). Using this toy model we make a rough estimate of the magnitude of the baryon to photon ratio induced by the leptogenesis mechanism. Solutions close to the CP conserving cases seem to be favored.

Nasri, Salah; Schechter, Joseph; Moussa, Sherif [Department of Physics, University of Maryland, College Park, Maryland 20742-4111 (United States); Department of Physics, Syracuse University, Syracuse, New York 13244-1130 (United States); Department of Mathematics, Faculty of Science, Ain Shams University (Egypt)

2004-09-01

281

The Application of the Haddon Matrix to Public Health Readiness and Response Planning  

PubMed Central

State and local health departments continue to face unprecedented challenges in preparing for, recognizing, and responding to threats to the public’s health. The attacks of 11 September 2001 and the ensuing anthrax mailings of 2001 highlighted the public health readiness and response hurdles posed by intentionally caused injury and illness. At the same time, recent natural disasters have highlighted the need for comparable public health readiness and response capabilities. Public health readiness and response activities can be conceptualized similarly for intentional attacks, natural disasters, and human-caused accidents. Consistent with this view, the federal government has adopted the all-hazards response model as its fundamental paradigm. Adoption of this paradigm provides powerful improvements in efficiency and efficacy, because it reduces the need to create a complex family of situation-specific preparedness and response activities. However, in practice, public health preparedness requires additional models and tools to provide a framework to better understand and prioritize emergency readiness and response needs, as well as to facilitate solutions; this is particularly true at the local health department level. Here, we propose to extend the use of the Haddon matrix—a conceptual model used for more than two decades in injury prevention and response strategies—for this purpose. PMID:15866764

Barnett, Daniel J.; Balicer, Ran D.; Blodgett, David; Fews, Ayanna L.; Parker, Cindy L.; Links, Jonathan M.

2005-01-01

282

A transverse isotropic model for microporous solids: Application to coal matrix adsorption and swelling  

NASA Astrophysics Data System (ADS)

Understanding the adsorption-induced swelling in coal is critical for predictable and enhanced coal bed methane production. The coal matrix is a natural anisotropic disordered microporous solid. We develop an elastic transverse isotropic poromechanical model for microporous solids which couples adsorption and strain through adsorption stress functions and expresses the adsorption isotherm as a multivariate function depending on fluid pressure and solid strains. Experimental data from the literature help invert the anisotropic adsorptive-mechanical properties of Brzeszcze coal samples exposed to CO2. The main findings include the following: (1) adsorption-induced swelling can be modeled by including fluid-specific and pressure-dependent adsorption stress functions into equilibrium equations, (2) modeling results suggest that swelling anisotropy is mostly caused by anisotropy of the solid mechanical properties, and (3) the total amount of adsorbed gas measured by immersing coal in the adsorbate overestimates adsorption amount compared to in situ conditions up to ˜20%. The developed fully coupled model can be upscaled to determine the coal seam permeability through permeability-stress relationships.

Espinoza, D. N.; Vandamme, M.; Dangla, P.; Pereira, J.-M.; Vidal-Gilbert, S.

2013-12-01

283

Application of Genetic Algorithms in Colombian Interconnected Power System Operative Planning  

Microsoft Academic Search

Each interconnected electric system has to define its operating mode and how expansion and operation planning are made. This paper presents the first phase of the work of implementing a tool with application to Colombian power system operative planning. The tool uses genetic algorithms to optimize the cost functions that arise in which the elements of the system are the

Jaime A. Valencia; Walter M. Villa; Esteban Velilla; G. Marin A; José I. Gutiérrez; Mónica M. Montoya

2009-01-01

284

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

285

FUNCTIONALIZED SILICA MATERIALS AND MIXED-MATRIX MEMBRANES FOR ENVIRONMENTAL APPLICATIONS  

Microsoft Academic Search

Functionalized silica materials are synthesized for various environmental applications. The overall objective is functionalization with sulfur-containing moieties for mercury sorption and as a platform for nanoparticle synthesis. The first objective is quantifying this functionalization for various silica platforms. The second objective is development of effective mercury sorbents, for both aqueous mercury and elemental mercury vapor. Third, those sorbents are incorporated

Noah Daniel Meeks

2012-01-01

286

LOW DIMENSIONAL POLYTOPE APPROXIMATION AND ITS APPLICATIONS TO NONNEGATIVE MATRIX FACTORIZATION  

E-print Network

algorithm and suggests an effective implementation. Testing results strongly evidence that this approach are abounding. We can hardly be exhaustive by suggesting [6, 11, 12, 13, 18, 19, 20, 21, 23] and the references with a little bit motives on the study of NMF, we briefly outline two applications below. A good survey of other

287

MIL-H-8501B: Application to shipboard terminal operations  

NASA Technical Reports Server (NTRS)

The philosophy and structure of the proposed U.S. Military Specification for Handling Qualities Requirements for Military Rotorcraft, MIL-H-8501B, are presented with emphasis on shipboard terminal operations. The impact of current and future naval operational requirements on the selection of appropriate combinations of basic vehicle dynamics and usable cue environments are identified. An example 'walk through' of MIL-H-8501B is conducted from task identification to determination of stability and control requirements. For selected basic vehicle dynamics, criteria as a function of input/response magnitude are presented. Additionally, rotorcraft design development implications are discussed.

Cappetta, A. N.; Johns, J. B.

1993-01-01

288

Intra-Operative Frozen Section Consultation: Concepts, Applications and Limitations  

PubMed Central

Intra-operative frozen section plays an important role in the management of surgical patients and yet it must be used prudently to avoid the indiscriminate usage of this important technique. As it is subjected to many limitations in comparison to the paraffin embedded tissue sections, this review aims to highlight the important concepts and principle of intra-operative frozen section consultation as well as discussing the limitations of this technique. This will then allow the endusers of this technique to be more informed and more selective in their decisions when requesting for a frozen section report. PMID:22589584

Jaafar, Hasnan

2006-01-01

289

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

290

Identification of rainfall-runoff models for operational applications  

Microsoft Academic Search

The problem of selecting appropriate objective functions for the identifica- tion of a lumped conceptual rainfall-runoff model is investigated, focusing on the value of the model in an operational setting. A probability-distributed soil moisture model is coupled with a linear parallel routing scheme, and conditioned on rainfall- runoff observations from three catchments in the southeast of England. Using an abstraction

THORSTEN WAGENER

2005-01-01

291

An Application-Independent System for Visualizing User Operation History  

E-print Network

of Computer Science The University of Tokyo toshi@ui.is.s.u-tokyo.ac.jp Takeo Igarashi Department of Computer Science The University of Tokyo / JST ERATO takeo@acm.org ABSTRACT A history-of-user-operations function, viewing an animation takes time. Of course, one could fast-forward through an anima- tion, but as playback

Igarashi, Takeo

292

Application of Operations Research Methods To Correctional Problems  

Microsoft Academic Search

The paper discusses basic operations research techniques to build models for optimization problems and some of the difficulties encountered in applying these techniques to address correctional problems, and indicates some possible areas in the criminal justice system that can be explored using these methods. It briefly reviews four different correctional projects that are currently being undertaken by the Pennsylvania Bureau

Sitansu S. Mittra

1975-01-01

293

Operational transfer path analysis: Theory, guidelines and tire noise application  

Microsoft Academic Search

The operational transfer path analysis (OTPA) method is the subject of research in this article, which starts with a discussion on it's theory. Here clear similarities with the MIMO technique in experimental modal analysis are found. Based on the knowledge of MIMO, one finds that input signals are allowed to be coherent to a certain extend. As coherence can be

D. de Klerk; A. Ossipov

2010-01-01

294

The application of optical coherence tomography to problems in polymer matrix composites  

NASA Astrophysics Data System (ADS)

The Composites Group at the National Institute of Standards and Technology has found optical coherence tomography (OCT) to be a powerful tool for non-destructive characterization of polymer matrix composites. Composites often exhibit superior properties to traditional materials such as wood and metal. However, the barrier to their widespread infiltration into consumer markets is cost. Composites can be made more cost competitive by improved composite design, process optimization, and quality control. OCT provides a means of evaluating the three aforementioned areas. OCT is a very versatile technique that can be applied to a variety of problems in polymer composites such as: microstructure determination for permeability and mechanical property prediction, void, dry spot, and defect detection, and damage evaluation. Briefly, OCT uses a low coherence source such as a superluminescent diode laser with a fiber optic based Michelson interferometer. In this configuration, the composite is the fixed arm of the interferometer. Reflections from heterogeneities within the sample are mapped as a function of thickness for any one position. Volume information is generated by translating the sample on a motorized stage. Information about the location and size of a feature within the composite is obtained. In this work, the power of OCT for imaging composite microstructure and damage is presented. An example of permeability prediction using the composite microstructure imaged from OCT is demonstrated. The effect of image processing on the value of permeability is discussed. Using the same sample, OCT imaging of composite impact damage is compared to more traditional techniques, X-ray computed tomography and confocal microscopy.

Dunkers, Joy P.; Phelan, Frederick R.; Sanders, Daniel P.; Everett, Matthew J.; Green, William H.; Hunston, Donald L.; Parnas, Richard S.

295

Advanced ceramic matrix composite materials for current and future propulsion technology applications  

NASA Astrophysics Data System (ADS)

Current rocket engines, due to their method of construction, the materials used and the extreme loads to which they are subjected, feature a limited number of load cycles. Various technology programmes in Europe are concerned, besides developing reliable and rugged, low cost, throwaway equipment, with preparing for future reusable propulsion technologies. One of the key roles for realizing reusable engine components is the use of modern and innovative materials. One of the key technologies which concern various engine manufacturers worldwide is the development of fibre-reinforced ceramics—ceramic matrix composites. The advantages for the developers are obvious—the low specific weight, the high specific strength over a large temperature range, and their great damage tolerance compared to monolithic ceramics make this material class extremely interesting as a construction material. Over the past years, the Astrium company (formerly DASA) has, together with various partners, worked intensively on developing components for hypersonic engines and liquid rocket propulsion systems. In the year 2000, various hot-firing tests with subscale (scale 1:5) and full-scale nozzle extensions were conducted. In this year, a further decisive milestone was achieved in the sector of small thrusters, and long-term tests served to demonstrate the extraordinary stability of the C/SiC material. Besides developing and testing radiation-cooled nozzle components and small-thruster combustion chambers, Astrium worked on the preliminary development of actively cooled structures for future reusable propulsion systems. In order to get one step nearer to this objective, the development of a new fibre composite was commenced within the framework of a regionally sponsored programme. The objective here is to create multidirectional (3D) textile structures combined with a cost-effective infiltration process. Besides material and process development, the project also encompasses the development of special metal/ceramic and ceramic/ceramic joining techniques as well as studying and verifying non destructive investigation processes for the purpose of testing components.

Schmidt, S.; Beyer, S.; Knabe, H.; Immich, H.; Meistring, R.; Gessler, A.

2004-08-01

296

Towards an operational ERTS - requirements for implementing cartographic applications of an operational ERTS type satellite  

NASA Technical Reports Server (NTRS)

After nearly 18 months of successful operation of the first Earth Resources Technology Satellite (ERTS-1), a careful look at the future in order. Judging from the results of ERTS-1 experiments, public sales of ERTS-1 products and overall worldwide response it is believed that ERTS-1 has demonstrated an earth sensing mode that should become operational. It is recognized that several studies leading to the definition of an operational ERTS have been made. However cartographic requirements are generally more basic and demanding than those of the earth science disciplines and are therefore treated separately in this report. One assumption made is that the configuration of ERTS, particularly with respect to the multispectral scanner and data transmission rates cannot be materially altered.

Colvocoresses, A. P.

1974-01-01

297

Decolorization applicability of sol-gel matrix immobilized manganese peroxidase produced from an indigenous white rot fungal strain Ganoderma lucidum  

PubMed Central

Background An eco-friendly treatment of industrial effluents is a major environmental concern of the modern world in the face of stringent environmental legislations. By keeping in mind the extensive industrial applications of ligninolytic enzymes, this study was performed to purify, and immobilize the manganese peroxidase (MnP) produced from an indigenous strain of Ganoderma lucidum. The present study was also focused on investigating the capability of immobilized MnP for decolorization of dye containing textile effluents. Results A large magnitude of an indigenous MnP (882±13.3 U/mL) was obtained from white rot fungal strain G. lucidum in solid state bio-processing of wheat straw under optimized fermentation conditions (moisture, 50%; substrate, 5 g; pH, 5.5; temperature, 30°C; carbon source, 2% fructose; nitrogen source, 0.02% yeast extract; C: N ratio, 25:1; fungal spore suspension, 5 mL and fermentation time period, 4 days). After ammonium sulfate fractionation and Sephadex-G-100 gel filtration chromatography, MnP was 4.7-fold purified with specific activity of 892.9 U/mg. G. lucidum MnP was monomeric protein as evident by single band corresponding to 48 kDa on native and denaturing SDS-PAGE. The purified MnP (2 mg/mL) was immobilized using a sol–gel matrix of tetramethoxysilane (TMOS) and proplytrimethoxysilane (PTMS). The oxidation of MnSO4 for up to 10 uninterrupted cycles demonstrated the stability and reusability of the immobilized MnP. Shelf life profile revealed that enzyme may be stored for up to 60 days at 25°C without losing much of its activity. To explore the industrial applicability of MnP produced by G. lucidum, the immobilized MnP was tested against different textile effluents. After 4 h reaction time, the industrial effluents were decolorized to different extents (with a maximum of 99.2%). The maximally decolorized effluent was analyzed for formaldehyde and nitroamines and results showed that the toxicity parameters were below the permissible limits. Conclusions In conclusion, G. lucidum MnP was immobilized by sol–gel matrix entrapment with an objective to enhance its practical efficiencies. The MnP was successfully entrapped into a sol- gel matrix of TMOS and PTMS with an overall immobilization efficiency of 93.7%. The sol- gel entrapped MnP seems to have prospective capabilities which can be useful for industrial purposes, especially for bioremediation of industrial effluents. PMID:23849469

2013-01-01

298

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

Microsoft Academic Search

The high quantum efficiency of the charge-coupled device (CCD) has rendered it the imaging technology of choice in diverse\\u000a applications. However, under extremely low light conditions where few photons are detected from the imaged object, the CCD\\u000a becomes unsuitable as its readout noise can easily overwhelm the weak signal. An intended solution to this problem is the\\u000a electron-multiplying charge-coupled device

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

299

Application of human error analysis to aviation and space operations  

Microsoft Academic Search

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

1998-01-01

300

46 CFR 298.12 - Applicant and operator's qualifications.  

Code of Federal Regulations, 2011 CFR

...the Vessel(s) or Shipyard Project, possesses the necessary...the Vessel(s) or Shipyard Project which serve as security for...requirements of this part. (b) Identity and ownership of applicant...assess the likelihood that the project will be successful, we...

2011-10-01

301

Certificate in Cyber Operations Pre-Application Form  

E-print Network

& SELF-LEARNING 1.What it your highest level of education?* High School Trade School College designated with * are required. This pre-application includes six steps: Contact Information Education and Legal Background Unofficial Transcripts (High School or College unofficial transcript must be submitted

Maryland, Baltimore County, University of

302

Long Running Application Models and Co-operating Monitors  

Microsoft Academic Search

Business processes representing related interactions within a business organization as well as e-commerce interactions across multiple independent autonomous organizations span days and weeks in time. The software which supports or automates the activities of a single business is best modeled as a set of long running applications which interact repeatedly with the outside world. The execution of these long running

Asit Dan; Francis Parr

1999-01-01

303

Application of diagnostics to determine operational readiness of aged motor-operated valves  

Microsoft Academic Search

Oak Ridge National Laboratory (ORNL) has been carrying out an aging assessment of motor-operated valves (MOVs) with the primary objective of recommending diagnostic methods for detecting and trending aging. As a result of experimental investigations at ORNL, it was discovered that the motor current during a valve stroke was a very useful diagnostic parameter for detecting and trending many MOV

Eissenberg

1987-01-01

304

Application of diagnostics to determine motor-operated valve operational readiness  

Microsoft Academic Search

ORNL has been carrying out an aging assessment of motor-operated valves (MOVs) with the primary objective of recommending diagnostic methods for detecting and trending aging. As a result of experimental investigations at ORNL, it was discovered that the motor current during a valve stroke was a very useful diagnostic parameter for detecting and trending many MOV drive train load variations.

Eissenberg

1986-01-01

305

Peri-operative warming devices: performance and clinical application.  

PubMed

Since the adverse consequences of accidental peri-operative hypothermia have been recognised, there has been a rapid expansion in the development of new warming equipment designed to prevent it. This is a review of peri-operative warming devices and a critique of the evidence assessing their performance. Forced-air warming is a common and extensively tested warming modality that outperforms passive insulation and water mattresses, and is at least as effective as resistive heating. More recently developed devices include circulating water garments, which have shown promising results due to their ability to cover large surface areas, and negative pressure devices aimed at improving subcutaneous perfusion for warming. We also discuss the challenge of fluid warming, looking particularly at how devices' performance varies according to flow rate. Our ultimate aim is to provide a guide through the bewildering array of devices on the market so that clinicians can make informed and accurate choices for their particular hospital environment. PMID:24720346

John, M; Ford, J; Harper, M

2014-06-01

306

The application of automated operations at the Institutional Processing Center  

NASA Technical Reports Server (NTRS)

The JPL Institutional and Mission Computing Division, Communications, Computing and Network Services Section, with its mission contractor, OAO Corporation, have for some time been applying automation to the operation of JPL's Information Processing Center (IPC). Automation does not come in one easy to use package. Automation for a data processing center is made up of many different software and hardware products supported by trained personnel. The IPC automation effort formally began with console automation, and has since spiraled out to include production scheduling, data entry, report distribution, online reporting, failure reporting and resolution, documentation, library storage, and operator and user education, while requiring the interaction of multi-vendor and locally developed software. To begin the process, automation goals are determined. Then a team including operations personnel is formed to research and evaluate available options. By acquiring knowledge of current products and those in development, taking an active role in industry organizations, and learning of other data center's experiences, a forecast can be developed as to what direction technology is moving. With IPC management's approval, an implementation plan is developed and resources identified to test or implement new systems. As an example, IPC's new automated data entry system was researched by Data Entry, Production Control, and Advance Planning personnel. A proposal was then submitted to management for review. A determination to implement the new system was made and elements/personnel involved with the initial planning performed the implementation. The final steps of the implementation were educating data entry personnel in the areas effected and procedural changes necessary to the successful operation of the new system.

Barr, Thomas H.

1993-01-01

307

Applications of triggered lightning to space vehicle operations  

NASA Technical Reports Server (NTRS)

Kennedy Space Center (KSC) and the USAF Eastern Space Missile Center (ESMC) covering an area of 25 x 40 km are frequently called America's Spaceport. This title is earned through the integration, by labor and management, of many skills in a wide variety of engineering fields to solve many technical problems that occur during the launch processing of space vehicles. Weather is one of these problems, and although less frequent in time and duration when compared to engineering type problems, has caused costly and life threatening situations. This sensitivity to weather, especially lightning, was recognized in the very early pioneer days of space operations. The need to protect the many v\\facilities, space flight hardware, and personnel from electrified clouds capable of producing lightning was a critical element in improving launch operations. A KSC lightning committee was formed and directed to improve lightning protection, detection, and measuring systems and required that all theoretical studies be confirmed by KSC field data. Over the years, there have been several lightning incidents involving flight vehicles during ground processing as well as launch. Subsequent investigations revealed the need to improve these systems as well as the knowledge of the electrical atmosphere and its effects on operations in regard to cost and safety. Presented here is how, KSC Atmospheric Science Field Laboratory (AFSL), in particular Rocket Triggered Lightning, is being used to solve these problems.

Jafferis, William; Sanicandro, Rocco; Rompalla, John; Wohlman, Richard

1992-01-01

308

Electrically conductive, black thermal control coatings for spacecraft applications. III - Plasma-deposited ceramic matrix  

NASA Technical Reports Server (NTRS)

Five black, electrically-conductive thermal control coatings have been formulated and tested for application on the Galileo spacecraft. The coatings consist of both organic and inorganic systems applied on titanium, aluminum, and glass/epoxy composite surfaces. The coatings were tested under simulated space environment conditions. Coated specimens were subjected to thermal radiation, convective and combustive heating, and cryogenic conditions over a temperature range between -196 C and 538 C. Mechanical, physical, thermal, electrical, and thermooptical properties are presented for one of these coatings. This paper describes the preparation, characteristics, and spraying of iron titanate on titanium and aluminum, and presents performance results.

Hribar, V. F.; Bauer, J. L.; O'Donnell, T. P.

1987-01-01

309

Output voltage regulation in matrix converter fed power electronic transformer for power systems application in electric ship  

Microsoft Academic Search

The system described in this paper uses three matrix converters and a high frequency transformer to achieve isolation and voltage transformation from primary to secondary side. Two matrix converters produce high frequency voltage across a transformer, with open ended primary. A third matrix converter converts the high frequency chopped voltage to line frequency. The non-idealities such as leakage inductance of

Shabari Nath; K. K. Mohapatra; Ned Mohan

2009-01-01

310

Application of fractal and grey level co-occurrence matrix analysis in evaluation of brain corpus callosum and cingulum architecture.  

PubMed

This aim of this study was to assess the discriminatory value of fractal and grey level co-occurrence matrix (GLCM) analysis methods in standard microscopy analysis of two histologically similar brain white mass regions that have different nerve fiber orientation. A total of 160 digital micrographs of thionine-stained rat brain white mass were acquired using a Pro-MicroScan DEM-200 instrument. Eighty micrographs from the anterior corpus callosum and eighty from the anterior cingulum areas of the brain were analyzed. The micrographs were evaluated using the National Institutes of Health ImageJ software and its plugins. For each micrograph, seven parameters were calculated: angular second moment, inverse difference moment, GLCM contrast, GLCM correlation, GLCM variance, fractal dimension, and lacunarity. Using the Receiver operating characteristic analysis, the highest discriminatory value was determined for inverse difference moment (IDM) (area under the receiver operating characteristic (ROC) curve equaled 0.925, and for the criterion IDM?0.610 the sensitivity and specificity were 82.5 and 87.5%, respectively). Most of the other parameters also showed good sensitivity and specificity. The results indicate that GLCM and fractal analysis methods, when applied together in brain histology analysis, are highly capable of discriminating white mass structures that have different axonal orientation. PMID:24967845

Pantic, Igor; Dacic, Sanja; Brkic, Predrag; Lavrnja, Irena; Pantic, Senka; Jovanovic, Tomislav; Pekovic, Sanja

2014-10-01

311

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

312

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

313

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

314

Multimegabit Operation Multiplexer System. [PCM telemetry unit for space applications  

NASA Technical Reports Server (NTRS)

The Multimegabit Operation Multiplexer System (MOMS) is a high-data-rate PCM telemetry unit capable of sampling and encoding 60 scanning radiometer and four vidicon channels at 250 kilosamples/second and 5 megasamples/second, respectively. This sampling capacity plus the seven-bit quantization requires a total throughput rate of 40 megasamples/second and 280 megabits/second. To produce these rates efficiently, the system was divided into a pair of identical 140-megabit blocks. A low-power 20-MHz analog multiplexer and analog-to-digital converter were developed together with a video sample-and-hold that features an aperture time error of less than 50 psec. Breadboard testing of these basic building blocks confirmed the design prediction that the total system would consume 27 watts of power. Two 140-megabit output parts are suitable for quadriphase modulation.

Giri, R. R.; Maxwell, M. S.

1973-01-01

315

Military applications of hypoxic training for high-altitude operations.  

PubMed

Rapid deployment of unacclimatized soldiers to high mountainous environments causes debilitating effects on operational capabilities (physical work performance), and force health (altitude sickness). Most of these altitude-induced debilitations can be prevented or ameliorated by a wide range of physiological responses collectively referred to as altitude acclimatization. Acclimatization to a target altitude can be induced by slow progressive ascents or continuous sojourns at intermediate altitudes. However, this "altitude residency" requirement reduces their utilization in rapid response military missions that exploit the air mobility capability of modern military forces to quickly deploy to an area of operations on short notice. A more recent approach to induce altitude acclimatization is the use of daily intermittent hypoxic exposures (IHE) in lieu of continuous residence at high altitudes. IHE treatments consist of three elements: 1) IHE simulated altitude (inspired oxygen partial pressure: PIO2), 2) IHE session duration, and 3) total number of IHE sessions over the treatment period. This paper reviews and summarizes the results of 25 published IHE studies. This review finds that an IHE altitude>or=4000 m, and daily exposure duration of at least 1.5 h repeated over a week or more are required to have a high probability of developing altitude acclimatization. The efficacy of shorter duration (<1.5 h) hypoxic exposures at >or=4000 m simulated altitudes, and longer exposures (>4 h) at moderate altitudes (2500-3500 m) is not well documented. The predominate IHE-induced altitude acclimatization response appears to be increased arterial oxygen content through ventilatory acclimatization. Thus, IHE is a promising approach to provide the benefits of altitude acclimatization to low-altitude-based soldiers before their deployment to high mountainous regions. PMID:17805096

Muza, Stephen R

2007-09-01

316

Development of RGB Composite Imagery for Operational Weather Forecasting Applications  

NASA Technical Reports Server (NTRS)

The NASA Short-term Prediction Research and Transition (SPoRT) Center, in collaboration with the Cooperative Institute for Research in the Atmosphere (CIRA), is providing red-green-blue (RGB) color composite imagery to several of NOAA s National Centers and National Weather Service forecast offices as a demonstration of future capabilities of the Advanced Baseline Imager (ABI) to be implemented aboard GOES-R. Forecasters rely upon geostationary satellite imagery to monitor conditions over their regions of responsibility. Since the ABI will provide nearly three times as many channels as the current GOES imager, the volume of data available for analysis will increase. RGB composite imagery can aid in the compression of large data volumes by combining information from multiple channels or paired channel differences into single products that communicate more information than provided by a single channel image. A standard suite of RGB imagery has been developed by the European Organization for the Exploitation of Meteorological Satellites (EUMETSAT), based upon the Spinning Enhanced Visible and Infrared Imager (SEVIRI). The SEVIRI instrument currently provides visible and infrared wavelengths comparable to the future GOES-R ABI. In addition, the Moderate Resolution Imaging Spectroradiometer (MODIS) instruments aboard the NASA Terra and Aqua satellites can be used to demonstrate future capabilities of GOES-R. This presentation will demonstrate an overview of the products currently disseminated to SPoRT partners within the GOES-R Proving Ground, and other National Weather Service forecast offices, along with examples of their application. For example, CIRA has used the channels of the current GOES sounder to produce an "air mass" RGB originally designed for SEVIRI. This provides hourly imagery over CONUS for looping applications while demonstrating capabilities similar to the future ABI instrument. SPoRT has developed similar "air mass" RGB imagery from MODIS, and through a case study example, synoptic-scale features evident in single-channel water vapor imagery are shown in the context of the air mass product. Other products, such as the "nighttime microphysics" RGB, are useful in the detection of low clouds and fog. Nighttime microphysics products from MODIS offer some advantages over single-channel or spectral difference techniques and will be discussed in the context of a case study. Finally, other RGB products from SEVIRI are being demonstrated as precursors to GOES-R within the GOES-R Proving Ground. Examples of "natural color" and "dust" imagery will be shown with relevant applications.

Molthan, Andrew L.; Fuell, Kevin K.; Oswald, Hayden, K; Knaff, John A.

2012-01-01

317

Durability of polymer matrix composites for automotive structural applications: A state-of-the-art review  

SciTech Connect

A key unanswered question that must be addressed before polymeric composites will be widely used in automotive structural components is their known durability. Major durability issues are the effects that cyclic loadings, creep, automotive fluid environments, and low-energy impacts have on dimensional stability, strength, and stiffness throughout the required life of a composite component. This report reviews the current state of understanding in each of these areas. It also discusses the limited information that exists on one of the prime candidate materials for automotive structural applications--an isocyanurate reinforced with a continuous strand, swirl mat. Because of the key role that nondestructive evaluations must play in understanding damage development and progression, a chapter is included on ultrasonic techniques. A final chapter then gives conclusions and recommendations for research needed to resolve the various durability issues. These recommendations will help provide a sound basis for program planning for the Durability of Lightweight Composite Structures Project sponsored by the US Department of Energy in cooperation with the Automotive Composites Consortium of Chrysler, Ford, and General Motors.

Corum, J.M.; Simpson, W.A. Jr.; Sun, C.T.; Talreja, R.; Weitsman, Y.J.

1995-07-01

318

An assessment of nitrogen-based manure application rates on 39 U.S. swine operations.  

PubMed

Water quality concerns and revised regulations are changing how confined animal feeding operations manage manure. Devising acceptable and feasible changes in manure practices requires a full understanding of the forces shaping current manure management decisions. Previous theoretical models have shown that a wide range of factors influence the lowest cost solution for manure management. We used a mechanistic model to characterize the manure management practices on 39 swine operations (20 unagitated lagoon and 19 slurry operations) in five states (Iowa, Missouri, North Carolina, Oklahoma, and Pennsylvania). Information was collected from each operation about animal numbers, feed and water use, manure handling and storage characteristics, field locations, crop rotation, fertilizer need, and equipment inventory and usage. Collected data were used as input and to validate results from a mechanistic model that determined acres required for manure application, manure application rate, time required for manure application, value of manure, and costs of manure management. The 39 farms had a mean of 984 animal units (AU) per operation, 18.2 AU ha(-1) (7.4 AU acre(-1)), and manure application costs of dollar 10.49 AU(-1) yr(-1). Significant factors affecting manure management included operation size, manure handling system, state, and ownership structure. Larger operations had lower manure management costs (r2 = 0.32). Manure value potentially exceeded manure application costs on 58% of slurry and 15% of lagoon operations. But 38% of slurry operations needed to apply manure off the farm whereas all lagoon operations had sufficient land for N-based manure management. Manure management was a higher percentage of gross income on contract operations compared with independents (P < 0.01). This research emphasized the importance of site-specific factors affecting manure management decisions and the economics of U.S. swine operations. PMID:15224950

Lory, John A; Massey, Raymond E; Zulovich, Joseph M; Hoehne, John A; Schmidt, Amy M; Carlson, Marcia S; Fulhage, Charles D

2004-01-01

319

The BiotSavart operator for application to knot theory, fluid dynamics, and plasma physics  

E-print Network

The Biot­Savart operator for application to knot theory, fluid dynamics, and plasma physics Jason in fluid dynamics and plasma physics. The Biot­Savart op- erator associates with each current distribution

Cantarella, Jason

320

The hunt for a Bellman function: applications to estimates of singular integral operators and to other  

E-print Network

The hunt for a Bellman function: applications to estimates of singular integral operators backward. : : : : : : : : : : : : : : : : : : : : : 40 6.3 The hunt for a Bellman (type) function : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 42 6.3.1 Remark : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 43 6.4 The hunt

Treil, Sergei

321

The hunt for a Bellman function: applications to estimates of singular integral operators and to other  

E-print Network

The hunt for a Bellman function: applications to estimates of singular integral operators backward. . . . . . . . . . . . . . . . . . . . . . 39 6.3 The hunt for a Bellman (type) function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 6.3.1 Remark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 6.4 The hunt

Nazarov, Fedja

322

Large bearing operation without retainer. [high speed ball bearings for space application  

NASA Technical Reports Server (NTRS)

The design and testing of large high-speed ball bearings for space application is described. A well-defined lubrication system to provide oil to both race contacts in zero g allows stable operation without ball retainer.

Kingsbury, E.

1978-01-01

323

Bio/Pharmaceutical Facilities, Operations and Validation Technician/Manager Open Applicant Pool  

E-print Network

Bio/Pharmaceutical Facilities, Operations and Validation Technician/Manager Open Applicant Pool Bio/Manager position: This position requires strong knowledge of engineering, facility maintenance, laboratory equipment and experience in biotech or pharmaceutical setting. Preferred experience with manufacturing

Stephens, Graeme L.

324

40 CFR 63.1104 - Process vents from continuous unit operations: applicability assessment procedures and methods.  

...report within 60 days after the performance test or applicability assessment...affected source. (ii) If a performance test is required as a result of a...operator shall specify that the performance test has become necessary due...

2014-07-01

325

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

326

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

327

Application of matrix solid-phase dispersion to the propham and maleic hydrazide determination in potatoes by differential pulse voltammetry and HPLC  

Microsoft Academic Search

The application of the matrix solid-phase dispersion (MSPD) process as sample treatment in connection with the electrochemical detection is studied for the first time. For this purpose, a novel methodology is introduced for the extraction of propham and maleic hydrazide herbicides from potatoes samples based in the MSPD process prior to their electrochemical detection. Potato samples disruption was done by

Alberto Sánchez Arribas; Esperanza Bermejo; Manuel Chicharro; Antonio Zapardiel

2007-01-01

328

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

329

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

Code of Federal Regulations, 2012 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...

2012-07-01

330

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

331

10 CFR 2.404 - Hearings on applications for operating licenses pursuant to appendix N of 10 CFR part 50.  

Code of Federal Regulations, 2011 CFR

...ORDERS Additional Procedures Applicable to Proceedings for the Issuance of Licenses To Construct and/or Operate Nuclear Power Plants of Identical Design at Multiple Sites § 2.404 Hearings on applications for operating licenses...

2011-01-01

332

Extension of Boolean algebra by a Bayesian operator; application to the definition of a Deterministic  

E-print Network

Extension of Boolean algebra by a Bayesian operator; application to the definition, it is the all or the none. Abstract This work contributes to the domains of Boolean algebra and of Bayesian prob- ability, by proposing an algebraic extension of Boolean algebras, which implements an operator

Paris-Sud XI, Université de

333

An Assessment of Nitrogen-Based Manure Application Rates on 39 U.S. Swine Operations  

Microsoft Academic Search

potential swine concentrated animal feeding oper- ations (CAFOs) generated 71 090 Mg of N and 71 730 Water quality concerns and revised regulations are changing how Mg of P available for land application (Gollehon et al., confined animal feeding operations manage manure. Devising accept- 2001). able and feasible changes in manure practices requires a full under- standing of the forces

John A. Lory; Raymond E. Massey; Joseph M. Zulovich; John A. Hoehne; Amy M. Schmidt; Marcia S. Carlson; Charles D. Fulhage

2004-01-01

334

Operation of power electronic converters at cryogenic temperatures for utility energy conditioning applications  

Microsoft Academic Search

The operation of power MOSFET devices at cryogenic temperatures has been shown to offer potential advantages in large conversion systems, due primarily to a major drop in on-resistance. This paper investigates the use of high frequency switch mode power electronics converters based on available commercial devices operating at cryogenic temperatures, particularly in relation to electricity supply applications. Efficiency, transient response

Alister I Gardiner; Stephen A Johnson; Ellery Schempp

1996-01-01

335

Evaluation of Transit Operations: Data Applications of Tri-Met's Automated Bus Dispatching System  

E-print Network

Evaluation of Transit Operations: Data Applications of Tri-Met's Automated Bus Dispatching System Transportation System (APTS) technology has been motivated by transit providers' desire to improve service data to evaluate potential demand. Detailed operations data are needed to develop schedules

Bertini, Robert L.

336

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

337

On a Successful Application of Multi-Agent Reinforcement Learning to Operations Research Benchmarks  

E-print Network

On a Successful Application of Multi-Agent Reinforcement Learning to Operations Research Benchmarks reinforcement learning techniques for a new category of challenging benchmark problems from the field of Operations Research. We demonstrate that interpreting and solving the task of job-shop scheduling as a multi

Teschner, Matthias

338

An Analysis of SEU Effects in Embedded Operating Systems for Real-Time Applications  

Microsoft Academic Search

Embedded operating systems are becoming widely used in electronic systems for fields ranging from the mobile phone to the industrial control mechanisms. The major advantages in using embedded operating systems include the capability of adapting the electronic functionalities to several kind of applications while respecting the real-time constraints. These characteristics make them attractive also for specific fields where the dependability

L. Sterpone; M. Violante

2007-01-01

339

Operating System Support for Augmented Reality Applications Loris D'Antoni1  

E-print Network

-level libraries like OpenCV or the Mi- crosoft Kinect SDK. In this paper, we explore how operating systems should in the context of a real room before buy- ing [13]. The Kinect has sold over 19 million units and allowsOperating System Support for Augmented Reality Applications Loris D'Antoni1 , Alan Dunn2 , Suman

Kohno, Tadayoshi

340

Operator calculus in generalized zeon algebras: theory and application to multi-constrained path  

E-print Network

Operator calculus in generalized zeon algebras: theory and application to multi-constrained path single-source Pareto paths remaining. 2 Theory: Generalized zeon algebras Zeon algebras are commutative-constrained path problems is described. keywords: shortest paths, message routing, operator calculus, semigroup

Paris-Sud XI, Université de

341

Operator calculus in generalized zeon algebras: theory and application to multi-constrained path  

E-print Network

Operator calculus in generalized zeon algebras: theory and application to multi-constrained path-constrained path problems is described. keywords: shortest paths, message routing, operator calculus, semigroup about self-avoiding structures (paths, cycles, trails, etc.) in the graph are revealed by computing

Schott, René - Institut de Mathématiques �lie Cartan, Université Henri Poincaré

342

Application of submarine extended operating cycle programs to the enhancement of commercial nuclear power plant operation and maintenance  

SciTech Connect

During the past 10 yr, the US Navy has extended submarine operating cycles - the period between major ship overhauls - from 4 to > 15 yr. Major programs to extend submarine operating cycles have been the submarine extended operating cycle (SEOC) and the engineered SEOC programs. Currently, the navy is incorporating lessons learned from these programs, as well as new concepts, into its newest Seawolf (SSN-21) ship class. Major elements of these programs are a disciplined machinery condition assessment (MCA) program consisting of intrusive and nonintrusive elements, the use of rotatable equipment pools, and the engineering of maintenance periodicities to establish operating cycles. Many of the concepts and elements of these programs can be applied to two objectives for enhanced operation and maintenance: the increased availability of means of improved equipment performance and reduced outage durations and the extension of plant life. The objectives of this paper are to review the US Navy SEOC programs, to draw parallels between the US Navy programs and commercial nuclear power plant programs, and to suggest potential opportunities for application to commercial nuclear power plants.

Mason, J.H.; Livingston, B.K.; Clarke, E.J.

1988-01-01

343

Performance assessments of Android-powered military applications operating on tactical handheld devices  

NASA Astrophysics Data System (ADS)

Transformative Apps (TransApps) is a Defense Advanced Research Projects Agency (DARPA) funded program whose goal is to develop a range of militarily-relevant software applications ("apps") to enhance the operational-effectiveness of military personnel on (and off) the battlefield. TransApps is also developing a military apps marketplace to facilitate rapid development and dissemination of applications to address user needs by connecting engaged communities of endusers with development groups. The National Institute of Standards and Technology's (NIST) role in the TransApps program is to design and implement evaluation procedures to assess the performance of: 1) the various software applications, 2) software-hardware interactions, and 3) the supporting online application marketplace. Specifically, NIST is responsible for evaluating 50+ tactically-relevant applications operating on numerous Android™-powered platforms. NIST efforts include functional regression testing and quantitative performance testing. This paper discusses the evaluation methodologies employed to assess the performance of three key program elements: 1) handheld-based applications and their integration with various hardware platforms, 2) client-based applications and 3) network technologies operating on both the handheld and client systems along with their integration into the application marketplace. Handheld-based applications are assessed using a combination of utility and usability-based checklists and quantitative performance tests. Client-based applications are assessed to replicate current overseas disconnected (i.e. no network connectivity between handhelds) operations and to assess connected operations envisioned for later use. Finally, networked applications are assessed on handhelds to establish baselines of performance for when connectivity will be common usage.

Weiss, Brian A.; Fronczek, Lisa; Morse, Emile; Kootbally, Zeid; Schlenoff, Craig

2013-05-01

344

The Chimera II Real-Time Operating System for Advanced Sensor-Based Control Applications  

Microsoft Academic Search

This paper describes the Chimera II Real-time Operating System, which has been developed for advanced sensor-based control applications. It has been designed as a local operating system, to be used in conjunction with a global operating system. It executes on one or more single board computers in a VMEbus-based system. Advanced sensor-based control systems are both statically and dynamically reconfigurable.

David B. Stewart; Donald E. Schmitz; Pradeep K. Khosla

1997-01-01

345

A Public Safety Application of GPS-Enabled Smartphones and the Android Operating System  

Microsoft Academic Search

While the Apple iPhone single handedly redefined the term ¿smartphone¿ during its first two years of release, Google's Android platform for mobile devices has quickly developed into a serious open source alternative. We explored the android operating system (OS) and software development environment and evaluated several of its capabilities by constructing a working application. This application collected speed and location

William L. Arensman; John G. Whipple; Marian Starr Boler

2009-01-01

346

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

347

Operational readiness of microwave remote sensing of soil moisture for hydrologic applications  

Microsoft Academic Search

Microwave remote sensing of soil moisture has been an active area of research since the 1970s but has yet found little use in operational applications. Given recent advances in retrieval algorithms and the approval of a dedicated soil moisture satellite, it is time to re-assess the potential of various satellite systems to provide soil moisture information for hydrologic applications in

Wolfgang Wagner; Günter Blöschl; Paolo Pampaloni; Jean-Christophe Calvet; Bizzarro Bizzarri; Jean-Pierre Wigneron; Yann Kerr

2007-01-01

348

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. PMID:22489178

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

2012-01-01

349

Photosensized controlling benzyl methacrylate-based matrix enhanced eu(3+) narrow-band emission for fluorescence applications.  

PubMed

This study synthesized a europium (Eu(3+)) complex Eu(DBM)(3)Cl-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 Eu(3+) energy level, was an energetically enhanced europium emission. Typical stacking behaviors of ?-? interactions between the ligands and the Eu(3+)-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 Eu(3+) 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. PMID:22489178

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

2012-01-01

350

Application of LBB to high energy piping systems in operating PWR  

SciTech Connect

The amendment to General Design Criterion 4 allows exclusion, from the design basis, of dynamic effects associated with high energy pipe rupture by application of leak-before-break (LBB) technology. This new approach has resulted in substantial financial savings to utilities when applied to the Pressurized Water Reactor (PWR) primary loop piping and auxiliary piping systems made of stainless steel material. To date majority of applications pertain to piping systems in operating plants. Various steps of evaluation associated with the LBB application to an operating plant are described in this paper.

Swamy, S.A.; Bhowmick, D.C. [Westinghouse Nuclear Technology Division, Pittsburgh, PA (United States)

1997-04-01

351

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

352

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

353

Repair of photoaged dermal matrix by topical application of a cosmetic ‘antiageing’ product: Repair of photoageing by a cosmetic product  

Microsoft Academic Search

Background Photoaged skin is characterized by coarse and fine wrinkles. The mech- anism of wrinkle formation appears to involve changes to components of the dermal extracellular matrix. Topical treatment with all-trans retinoic acid (RA) can repair photoaged dermal matrix; this is regarded as the 'gold standard' against which repair agents are judged. To date, little is known regarding the ability

R. E. B. Watson; S. P. Long; J. J. Bowden; J. Y. Bastrilles; S. P. Barton; C. E. M. Griffiths

2007-01-01

354

Operations  

ERIC Educational Resources Information Center

Previous research has documented schemes and operations that undergird students' understanding of fractions. This prior research was based, in large part, on small-group teaching experiments. However, written assessments are needed in order for teachers and researchers to assess students' ways of operating on a whole-class scale. In this…

Wilkins, Jesse L. M.; Norton, Anderson; Boyce, Steven J.

2013-01-01

355

Algebraic Approach to Bare Nucleon Matrix Elements  

E-print Network

An algebraic method for evaluating bare nucleon matrix elements of quark operators is proposed. Thereby, bare nucleon matrix elements are traced back to vacuum matrix elements. The method is similar to the soft pion theorem. Matrix elements of two-quark, four-quark and six-quark operators inside the bare nucleon are considered.

Sven Zschocke; Burkhard Kampfer; Guenter Plunien

2005-06-29

356

Medical Matrix  

NSDL National Science Digital Library

Medical Matrix is a Web resource that offers a database of Internet clinical medicine resources. Medical Matrix categorizes resources by disease, specialty, and other interest areas. It is designed as a "home page" for a physician's or healthworker's computer. Medical Matrix is a project of the Internet Working Group of the American Medical Informatics Association.

357

Effects of Fiber Reinforcement Architecture on the Hygrothermal-Mechanical Performance of Polyimide Matrix Composites for Aeropropulsion Applications  

NASA Technical Reports Server (NTRS)

A lightweight sandwich support structure, for the combustor chamber of a new generation liquid propellant rocket engine, was designed and fabricated using a polymer matrix composite (PMC) facesheet on a Ti honeycomb core. The PMC facesheet consisted of high stiffness carbon fiber, M40JB, and high temperature Polyimides, such as PMR-II-50 and HFPE-II-52. Six different fiber architectures; four harness satin (4HS) woven fabric, uni-tape, woven-uni hybrid, stitched woven fabric, stitched uni-tape and triaxial braided structures have been investigated for optimum stiffness-thickness-weight-hygrothermal performance design criteria for the hygrothermal-mechanical propulsion service exposure conditions including rapid heating up to 200 F/sec, maximum operating temperature of 600 F, internal pressure up to 100 psi. One of the specific objectives in this study is to improve composite blistering resistance in z-direction at minimum expense of in-plane mechanical properties. An extensive property-performance database including dry-wet mechanical properties at various temperatures, thermal-physical properties, such as blistering onset condition was generated for fiber architecture down-selection and design guidelines. Various optimized process methods such as vacuum bag compression molding, solvent assistant resin transfer molding (SaRTM), resin film infusion (RFI) and autoclaving were utilized for PMC panel fabrication depending on the architecture type. In the case of stitched woven fabric architecture, the stitch pattern in terms of stitch density and yarn size was optimized based on both in-plane mechanical properties and blistering performance. Potential reduction of the in-plane properties transverse to the line of stitching was also evaluated. Efforts have been made to correlate the experimental results with theoretical micro-mechanics predictions. Changes in deformation mechanism and failure sequences in terms of fiber architecture will be discussed.

Shin, E. Eugene; Thesken, John C.; Sutter, James K.; Chuang, Kathy; Juhas, John; Veverka, Adrienne; Inghram, Linda; Papadopoulos, Demetrios; Burke, Chris; Scheiman, Dan

2003-01-01

358

Investigation of matrix effects in bioanalytical high-performance liquid chromatography/tandem mass spectrometric assays: application to drug discovery.  

PubMed

A series of studies was performed to investigate some of the causes for matrix effects ('ion suppression' or 'ion enhancement') in bioanalytical high-performance liquid chromatography/tandem mass spectrometry (HPLC/MS/MS) assays. Previous studies have reported that matrix effects are mainly due to endogenous components in biological fluids and are a greater concern for electrospray ionization (ESI) than for atmospheric pressure chemical ionization (APCI). In this report we demonstrate that: (1) matrix effects can also be caused by exogenous materials, such as polymers contained in different brands of plastic tubes, or Li-heparin, a commonly used anticoagulant; (2) matrix effects are not only ionization mode (APCI or ESI) dependent, but also source design (Sciex, Finnigan, Micromass) dependent; and (3) for at least one vendor's design, we found the APCI mode to be more sensitive to matrix effects than the ESI mode. Based on these findings, we have proposed the following simple strategies to avoid matrix effects: (1) select the same brand of plastic tubes for processing and storing plasma samples and spiked plasma standards; (2) avoid using Li-heparin as the anticoagulant; and (3) try switching the ionization mode or switching to different mass spectrometers when matrix effects are encountered. These three strategies have allowed us to use protein precipitation and generic fast LC techniques to generate reliable LC/MS/MS data for the support of pharmacokinetic studies at the early drug discovery stage. PMID:12478560

Mei, Hong; Hsieh, Yunsheng; Nardo, Cymbylene; Xu, Xiaoying; Wang, Shiyong; Ng, Kwokei; Korfmacher, Walter A

2003-01-01

359

The Augmented Lagrange Multipliers Method for Matrix Completion from Corrupted Samplings with Application to Mixed Gaussian-Impulse Noise Removal  

PubMed Central

This paper studies the problem of the restoration of images corrupted by mixed Gaussian-impulse noise. In recent years, low-rank matrix reconstruction has become a research hotspot in many scientific and engineering domains such as machine learning, image processing, computer vision and bioinformatics, which mainly involves the problem of matrix completion and robust principal component analysis, namely recovering a low-rank matrix from an incomplete but accurate sampling subset of its entries and from an observed data matrix with an unknown fraction of its entries being arbitrarily corrupted, respectively. Inspired by these ideas, we consider the problem of recovering a low-rank matrix from an incomplete sampling subset of its entries with an unknown fraction of the samplings contaminated by arbitrary errors, which is defined as the problem of matrix completion from corrupted samplings and modeled as a convex optimization problem that minimizes a combination of the nuclear norm and the -norm in this paper. Meanwhile, we put forward a novel and effective algorithm called augmented Lagrange multipliers to exactly solve the problem. For mixed Gaussian-impulse noise removal, we regard it as the problem of matrix completion from corrupted samplings, and restore the noisy image following an impulse-detecting procedure. Compared with some existing methods for mixed noise removal, the recovery quality performance of our method is dominant if images possess low-rank features such as geometrically regular textures and similar structured contents; especially when the density of impulse noise is relatively high and the variance of Gaussian noise is small, our method can outperform the traditional methods significantly not only in the simultaneous removal of Gaussian noise and impulse noise, and the restoration ability for a low-rank image matrix, but also in the preservation of textures and details in the image. PMID:25248103

Meng, Fan; Yang, Xiaomei; Zhou, Chenghu

2014-01-01

360

Contrast mechanisms in polarization-sensitive Mueller-matrix optical coherence tomography and application in burn imaging  

Microsoft Academic Search

We investigate the various contrast mechanisms provided by polarization-sensitive (PS) Mueller-matrix optical coherence tomography (OCT). Our PS multichannel Mueller-matrix OCT is the first, to our knowledge, to offer simultaneously comprehensive polarization-contrast mechanisms, including the amplitude of birefringence, the orientation of birefringence, and the diattenuation in addition to the polarization-independent intensity contrast, all of which can be extracted from the measured

Shuliang Jiao; Wurong Yu; George Stoica; Lihong V. Wang

2003-01-01

361

A phase-synchronization and random-matrix based approach to multichannel time-series analysis with application to epilepsy  

NASA Astrophysics Data System (ADS)

We present a general method to analyze multichannel time series that are becoming increasingly common in many areas of science and engineering. Of particular interest is the degree of synchrony among various channels, motivated by the recognition that characterization of synchrony in a system consisting of many interacting components can provide insights into its fundamental dynamics. Often such a system is complex, high-dimensional, nonlinear, nonstationary, and noisy, rendering unlikely complete synchronization in which the dynamical variables from individual components approach each other asymptotically. Nonetheless, a weaker type of synchrony that lasts for a finite amount of time, namely, phase synchronization, can be expected. Our idea is to calculate the average phase-synchronization times from all available pairs of channels and then to construct a matrix. Due to nonlinearity and stochasticity, the matrix is effectively random. Moreover, since the diagonal elements of the matrix can be arbitrarily large, the matrix can be singular. To overcome this difficulty, we develop a random-matrix based criterion for proper choosing of the diagonal matrix elements. Monitoring of the eigenvalues and the determinant provides a powerful way to assess changes in synchrony. The method is tested using a prototype nonstationary noisy dynamical system, electroencephalogram (scalp) data from absence seizures for which enhanced cortico-thalamic synchrony is presumed, and electrocorticogram (intracranial) data from subjects having partial seizures with secondary generalization for which enhanced local synchrony is similarly presumed.

Osorio, Ivan; Lai, Ying-Cheng

2011-09-01

362

The Procedure Execution Manager and Its Application to Advanced Photon Source Accelerator Operation  

NASA Astrophysics Data System (ADS)

The Procedure Execution Manager (PEM) combines a complete scripting environment for coding accelerator operation procedures with a manager application for executing and monitoring of the procedures. PEM is based on Tcl/Tk, a supporting graphics library, and the dp-tcl extension for distributed processing. A careful design balance has been achieved which meets the flexibility requirements of commissioning physicists and the operations-driven need for automation and a consistent user interface. The scripting environment provides support for distributed, parallel execution of procedures along with join and controlled abort operations. The manager application allows an operator to execute a procedure in automatic, semi-automatic, or manual modes. A number of successful applications of PEM to accelerator operations have been made to date. These include startup, shutdown, and other control of the positron accumulator ring (PAR), low-energy transport lines (LET), 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.

Saunders, C. W.; Borland, M.

1997-05-01

363

Metal matrix composites for aircraft propulsion systems  

NASA Technical Reports Server (NTRS)

Studies of advanced aircraft propulsion systems have indicated that performance gains and operating costs are possible through the application of metal matrix composites. Compressor fan blades and turbine blades have been identified as components with high payoff potential as a result of these studies. This paper will present the current status of development of five candidate materials for such applications. Boron fiber/aluminum, boron fiber/titanium, and silicon carbide fiber/titanium composites are considered for lightweight compressor fan blades. Directionally solidified eutectic superalloy and tungsten wire/superalloy composites are considered for application to turbine blades for use temperatures to 1100 C (2000 F).

Signorelli, R. A.

1975-01-01

364

Twisted mass QCD for weak matrix elements  

E-print Network

I report on the application of tmQCD techniques to the computation of hadronic matrix elements of four-fermion operators. Emphasis is put on the computation of $B_K$ in quenched QCD performed by the ALPHA Collaboration. The extension of tmQCD strategies to the study of neutral $B$-meson mixing is briefly discussed. Finally, some remarks are made concerning proposals to apply tmQCD to the computation of $K\\to\\pi\\pi$ amplitudes.

Carlos Pena

2006-10-19

365

Sparse matrix inverse factors  

SciTech Connect

The inverses of matrix factors lend themselves to parallel operations in the direct solution phase of sparse matrix solutions. These inverse factors, given suitable ordering of the equations, are themselves sparse, if less so than the original factors. Partitioning reduces the build-up of nonzero elements in the inverse factors. All of the multiplications required for repeat solutions may be performed in parallel using the inverse factors, with only as many serial steps as twice the number of factors.

Enns, M.K. (Electrocon International, Inc., Ann Arbor, MI (USA)); Tinney, W.F.; Alvarado, F.L. (Wisconsin Univ., Madison, WI (USA))

1990-05-01

366

Faces of matrix models  

NASA Astrophysics Data System (ADS)

Partition functions of eigenvalue matrix models possess a number of very different descriptions: as matrix integrals, as solutions to linear and nonlinear equations, as ?-functions of integrable hierarchies and as special-geometry prepotentials, as result of the action of W-operators and of various recursions on elementary input data, as gluing of certain elementary building blocks. All this explains the central role of such matrix models in modern mathematical physics: they provide the basic "special functions" to express the answers and relations between them, and they serve as a dream model of what one should try to achieve in any other field.

Morozov, A.

2012-08-01

367

A New Robust Operator for Computer Vision: Application to Range and Intensity Images  

E-print Network

A New Robust Operator for Computer Vision: Application to Range and Intensity Images Charles V that produce: (1) large numbers of outliers, (2) points from multiple surfaces interspersed over large image also showed that MINPRAN often favors a single fit bridging multiple surfaces when the data in an image

Bystroff, Chris

368

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

369

Industrial application of multivariate SPC to continuous caster start-up operations for breakout prevention  

Microsoft Academic Search

Breakouts are of major concern in the continuous steel-casting process, because they can lead to severe damage to equipment, significant process downtime, and potential safety consequences. Dofasco's plant experiences show that approximately 25% of breakouts occur during the caster start-up operation. This paper describes an advanced industrial application of the Multiway Principal Component Analysis (MPCA) method to monitor continuous caster

Yale Zhang; Michael S. Dudzic

2006-01-01

370

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

Microsoft Academic Search

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

Terence J. Centner; Theodore A. Feitshans

2006-01-01

371

Thermal energy storage program annual operating plan FY 1980. Building heating and cooling applications  

Microsoft Academic Search

The thermal energy storage program operating plans for FY 1980 are described in terms of general program objectives (scope, justification, targets, and goals), the proposed approach and organization for achieving these objectives (program elements and schedules), and the specific technical activities being implemented. Building heating and cooling applications as well as fiscal data, are presented for each of the several

D. M. Eissenberg; H. W. Hoffman

1980-01-01

372

Delete and insert operations in Voronoi\\/Delaunay methods and applications  

Microsoft Academic Search

This paper presents simple point insertion and deletion operations in Voronoi diagrams and Delaunay triangulations which may be useful for a wide variety of applications, either where interactivity is important, or where local modification of the topology is preferable to global rebuilding. While incremental point insertion has been known for many years, point deletion is relatively unknown. The robustness and

Mir Abolfazl Mostafavi; Christopher Gold; Maciej Dakowicz

373

Problems in operational and systems analysis educational process: solved by ICT application  

Microsoft Academic Search

The ICT application will cultivate new methods, with a possibility to be used in all subjects. It will contain influences from inside and outside the faculty or university. To study methods of operational and systems analysis is very difficult for students, most of themes are hard to understand and need a lot of examples to practice. The scheme for the

Martina Berankova; Petra Nevrivova

2003-01-01

374

Application of the HGPT methodology of reactor operation problems with a nodal mixed method  

Microsoft Academic Search

The heuristically based generalized perturbation theory (HGPT), to first and higher order, applied to the neutron field of a reactor system, is discussed in relation to quasistatic problems. This methodology is of particular interest in reactor operation. In this application it may allow an on-line appraisal of the main physical responses of the reactor system when subject to alterations relevant

A. M. Baudron; G. B. Bruna; A. Gandini; J. J. Lautard; S. Monti; G. Pizzigati

1998-01-01

375

A study on applications of energy storage for the wind power operation in power systems  

Microsoft Academic Search

Energy storage system (ESS) has been studied as a high-tech solution for managing power flows from wind turbine generator (WTG), and making them be competitive energy sources without putting power systems at risk. This paper illustrates possible applications of the energy storage for the wind power operating in power systems focusing on its short-duration prospective. Employing a sample power system,

Kyung Soo Kook; Keith J. McKenzie; Yilu Liu; Stan Atcitty

2006-01-01

376

Fifth Annual Workshop on Space Operations Applications and Research (SOAR 1991), volume 2  

NASA Technical Reports Server (NTRS)

Papers given at the Space Operations and Applications Symposium, host by the NASA Johnson Space Center on July 9-11, 1991 are given. The technical areas covered included intelligent systems, automation and robotics, human factors and life sciences, and environmental interactions.

Krishen, Kumar (editor)

1992-01-01

377

MODAL TESTING AND ANALYSIS OF STRUCTURES UNDER OPERATIONAL CONDITIONS: INDUSTRIAL APPLICATIONS  

Microsoft Academic Search

Experimental identification of structural dynamics models is usually based on the modal analysis approach. In the classical modal parameter estimation approach, the baseline data which are processed are frequency response functions measured under laboratory conditions. However, in many applications, the real operating conditions may differ significantly from those applied during the modal test. Hence, the need arises to identify a

L. Hermans; H. VAN DER AUWERAER

1999-01-01

378

Rationale, Scenarios, and Profiles for the Application of the Internet Protocol Suite (IPS) in Space Operations  

NASA Technical Reports Server (NTRS)

This greenbook captures some of the current, planned and possible future uses of the Internet Protocol (IP) as part of Space Operations. It attempts to describe how the Internet Protocol is used in specific scenarios. Of primary focus is low-earth-orbit space operations, which is referred to here as the design reference mission (DRM). This is because most of the program experience drawn upon derives from this type of mission. Application profiles are provided. This includes parameter settings programs have proposed for sending IP datagrams over CCSDS links, the minimal subsets and features of the IP protocol suite and applications expected for interoperability between projects, and the configuration, operations and maintenance of these IP functions. Of special interest is capturing the lessons learned from the Constellation Program in this area, since that program included a fairly ambitious use of the Internet Protocol.

Benbenek, Daniel B.; Walsh, William

2010-01-01

379

Spectral Pollution and How to Avoid It (With Applications to Dirac and Periodic Schrödinger Operators)  

E-print Network

This paper, devoted to the study of spectral pollution, contains both abstract results and applications to some self-adjoint operators with a gap in their essential spectrum occuring in Quantum Mechanics. First we consider Galerkin basis which respect the decomposition of the ambient Hilbert space into a direct sum $H=PH\\oplus(1-P)H$, given by a fixed orthogonal projector $P$, and we localize the polluted spectrum exactly. This is followed by applications to periodic Schr\\"odinger operators (pollution is absent in a Wannier-type basis), and to Dirac operator (several natural decompositions are considered). In the second part, we add the constraint that within the Galerkin basis there is a certain relation between vectors in $PH$ and vectors in $(1-P)H$. Abstract results are proved and applied to several practical methods like the famous "kinetic balance" of relativistic Quantum Mechanics.

Mathieu Lewin; Eric Séré

2008-12-11

380

Application of mixture experimental design in the formulation and optimization of matrix tablets containing carbomer and hydroxy-propylmethylcellulose.  

PubMed

Using mixture experimental design, the effect of carbomer (Carbopol((R)) 971P NF) and hydroxypropylmethylcellulose (Methocel((R)) K100M or Methocel((R)) K4M) combination on the release profile and on the mechanism of drug liberation from matrix tablet was investigated. The numerical optimization procedure was also applied to establish and obtain formulation with desired drug release. The amount of TP released, release rate and mechanism varied with carbomer ratio in total matrix and HPMC viscosity. Increasing carbomer fractions led to a decrease in drug release. Anomalous diffusion was found in all matrices containing carbomer, while Case - II transport was predominant for tablet based on HPMC only. The predicted and obtained profiles for optimized formulations showed similarity. Those results indicate that Simplex Lattice Mixture experimental design and numerical optimization procedure can be applied during development to obtain sustained release matrix formulation with desired release profile. PMID:20162406

Petrovic, Aleksandra; Cvetkovic, Nebojsa; Ibric, Svetlana; Trajkovic, Svetlana; Djuric, Zorica; Popadic, Dragica; Popovic, Radmila

2009-12-01

381

Extreme ranks of the solution to a consistent system of linear quaternion matrix equations with an application  

Microsoft Academic Search

In this paper, we establish the maximal and minimal ranks of the solution to the consistent system of quaternion matrix equations A1X=C1,A2X=C2,A3XB3=C3 and A4XB4=C4, which was investigated recently by Wang [Q.W. Wang, The general solution to a system of real quaternion matrix equations, Comput. Math. Appl. 49 (2005) 665–675]. Moreover, corresponding results on some special cases are presented. As an

Qing-wen Wang; Guang-jing Song; Chun-yan Lin

2007-01-01

382

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

...AND ENFORCEMENT, DEPARTMENT OF THE INTERIOR PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE MASSACHUSETTS § 921.784 Underground mining permit applications—minimum requirements for reclamation and operation plan....

2014-07-01

383

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

Code of Federal Regulations, 2013 CFR

...AND ENFORCEMENT, DEPARTMENT OF THE INTERIOR PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE MASSACHUSETTS § 921.784 Underground mining permit applications—minimum requirements for reclamation and operation plan....

2013-07-01

384

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

Code of Federal Regulations, 2011 CFR

...AND ENFORCEMENT, DEPARTMENT OF THE INTERIOR PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE MASSACHUSETTS § 921.784 Underground mining permit applications—minimum requirements for reclamation and operation plan....

2011-07-01

385

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

Code of Federal Regulations, 2012 CFR

...AND ENFORCEMENT, DEPARTMENT OF THE INTERIOR PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE MASSACHUSETTS § 921.784 Underground mining permit applications—minimum requirements for reclamation and operation plan....

2012-07-01

386

Application of matrix singular value properties for evaluating gain and phase margins of multiloop systems. [stability margins for wing flutter suppression and drone lateral attitude control  

NASA Technical Reports Server (NTRS)

A stability margin evaluation method in terms of simultaneous gain and phase changes in all loops of a multiloop system is presented. A universal gain-phase margin evaluation diagram is constructed by generalizing an existing method using matrix singular value properties. Using this diagram and computing the minimum singular value of the system return difference matrix over the operating frequency range, regions of guaranteed stability margins can be obtained. Singular values are computed for a wing flutter suppression and a drone lateral attitude control problem. The numerical results indicate that this method predicts quite conservative stability margins. In the second example if the eigenvalue magnitude is used instead of the singular value, as a measure of nearness to singularity, more realistic stability margins are obtained. However, this relaxed measure generally cannot guarantee global stability.

Mukhopadhyay, V.; Newsom, J. R.

1982-01-01

387

Matrix Metalloproteinases  

PubMed Central

Articles on tumor invasion, metastasis, and angiogenesis in normal and disease states have been well represented among the pages of The American Journal of Pathology. In addition to exciting interest in a variety of disease processes, these studies have been central in defining the emerging field in cancer research known as the tumor microenvironment. Early studies in this field established the importance of the extracellular matrix on tumor cell growth and differentiation. With time, the role of the extracellular matrix and matrix metalloproteinases in the regulation of tumor invasion, metastasis, and angiogenesis was recognized, and AJP has published seminal articles in this field. Moreover, recent studies show evidence for a role of matrix metalloproteinases in the regulation of inflammation within tumor lesions, making the targeting of matrix metalloproteinases in cancer therapy even more complex. This review attempts to summarize the contribution of AJP to some of the key changes that have led to the evolution of this field. PMID:23063657

Shuman Moss, Laurie A.; Jensen-Taubman, Sandra; Stetler-Stevenson, William G.

2013-01-01

388

Web Application Security Standards and Practices Page 1 of 13 Web Application Security Standard Operating Environment (SOE) V1 1 (2).  

E-print Network

Web Application Security Standards and Practices Page 1 of 13 Web Application Security Standard Operating Environment (SOE) V1 1 (2). Columbia University Web Application Security Standards and Practices Objective and Scope Effective Date: January 2011 This Web Application Security Standards and Practices

Grishok, Alla

389

Magnetic Parkia pendula seed gum as matrix for Concanavalin A lectin immobilization and its application in affinity purification.  

PubMed

The present work aimed to magnetize Parkia pendula seeds gum and use it as a matrix for Concanavalin A covalent immobilization. This composite was applied in affinity purification of glycoconjugates. Parkia pendula seeds were hydrated and the gum provenient from the supernatant was precipitated and washed with ethanol and dried. The gum was magnetized in co-precipitation using solutions of Fe+2 and Fe+3. Matrix activation was accomplished with NaIO4. Magnetized Parkia pendula seeds gum with covalently immobilized Concanavalin A was used as an affinity matrix for the recognition of bovine serum fetuin glycoprotein. Fetuin elution was carried out with a solution of glucose (300mM) and evaluated through SDS-PAGE. The efficiency of lectin immobilization and fetuin purification were 63% and 14%, respectively. These results indicate that the composite produced is a promising magnetic polysaccharide matrix for lectins immobilization. Thus, such system can be applied for affinity purification allowing an easy recovery by magnetic field. PMID:25140501

Rêgo, Moacyr J B M; Almeida, Sinara M; Bezerra, Sérgio A; Carvalho Júnior, Luiz B; Beltrão, Eduardo I C

2014-09-01

390

Spectral Methods for Matrix Rigidity with Applications to Size-Depth Trade-offs and Communication Complexity  

Microsoft Academic Search

The rigidity of a matrix measures the number of entries that must be changed in order to reduce its rank below a certain value. The known lower bounds on the rigidity of explicit matrices are very weak. It is known that stronger lower bounds would have important consequences in complexity theory. We consider some restricted variants of the rigidity problem

Satyanarayana V. Lokam

2001-01-01

391

Vibrational self-consistent field approach to anharmonic spectroscopy of molecules in solids: Application to iodine in argon matrix  

E-print Network

, and that the treatment includes anharmonic effects, both due to the intrinsic property of individual modes and due- monic level.6 The treatment of matrix effects on the molecu- lar vibrational lines would have been relatively simple, of course, had the media been of static atoms. In fact, both theoretical considerations

Apkarian, V. Ara

392

Comments on the 1950s applications and extensions of Skinner's operant psychology  

PubMed Central

These comments address Laties', Dewsbury's, and Rutherford's papers on the extension and application of Skinner's operant psychology during the 1950s. I begin by reflecting on the papers' overall theme—that the success of behavior analysis lies in its practical applications—and add some comments on Planck's principle. I then turn to the three papers and address such topics as (a) other applications and extensions (e.g., the U.S. space program), (b) relations between the research and researchers at the Yerkes Laboratories of Primate Biology (e.g., a Yerkes' researcher in Skinner's laboratory), and (c) human schedule performance (e.g., continuity and discontinuity with nonhuman behavior). I end with a discussion of the fundamental reason for the success of the extensions and applications of behavior analysis—the experimental analysis of behavior. PMID:22478408

Morris, Edward K.

2003-01-01

393

Sixth Annual Workshop on Space Operations Applications and Research (SOAR 1992), volume 2  

NASA Technical Reports Server (NTRS)

This document contains papers presented at the Space Operations, Applications, and Research Symposium (SOAR) hosted by the U.S. Air Force (USAF) on 4-6 Aug. 1992. The symposium was cosponsored by the Air Force Material Command and by NASA/JSC. Key technical areas covered during the symposium were robotics and telepresence, automation and intelligent systems, human factors, life sciences, and space maintenance and servicing. The SOAR differed from most other conferences in that it was concerned with Government-sponsored research and development relevant to aerospace operations. Symposium proceedings include papers covering various disciplines presented by experts from NASA, the USAF, universities, and industry.

Krishen, Kumar (editor)

1993-01-01

394

Seventh Annual Workshop on Space Operations Applications and Research (SOAR 1993), volume 2  

NASA Technical Reports Server (NTRS)

This document contains papers presented at the Space Operations, Applications and Research Symposium (SOAR) Symposium hosted by NASA/Johnson Space Center (JSC) and cosponsored by NASA/JSC and U.S. Air Force Materiel Command. SOAR included NASA and USAF programmatic overviews, plenary session, panel discussions, panel sessions, and exhibits. It invited technical papers in support of U.S. Army, U.S. Navy, Department of Energy, NASA, and USAF programs in the following areas: robotics and telepresence, automation and intelligent systems, human factors, life support, and space maintenance and servicing. SOAR was concerned with Government-sponsored research and development relevant to aerospace operations.

Krishen, Kumar (editor)

1994-01-01

395

The Application of Performance Assessment to Make Regulatory and Operational Changes in an Operating Nuclear Waste Repository  

SciTech Connect

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) certified that the WIPP met the performance requirements of 40 CFR Part 191, Environmental Radiation Protection Standards for Management and Disposal of Spent Nuclear Fuel, High-Level and Transuranic Radioactive Wastes. A PA analysis of long term (10,000 year) repository performance successfully demonstrated that the probability and consequences of potential long-term releases of radionuclides to the accessible environment would be well below the established limits. These results were key in obtaining WIPP's initial certification, allowing the first shipment and disposal of nuclear waste in March of 1999. As disposal operations have taken place over the last eight years, changes have been identified in the regulatory and operational realms of the facility that would enhance waste disposal efficiency. Such changes, however, cannot be made without prior consent of the EPA. Therefore, changes planned by the DOE must be thoroughly described and supported by varying degrees of the same type of analyses that were conducted to demonstrate the WIPP's containment capabilities as presented in the initial compliance application submitted to EPA in 1996. Such analyses are used to identify the impacts or benefits of implementing the planned change. The DOE has successfully used performance assessment analyses for the approval of changes such as: 1) the disposal of super-compacted waste forms, and; 2) the adoption of new parameters and modeling assumptions In some cases the planned changes are simpler in nature than those listed above, and therefore only require targeted or simplified PA analyses to demonstrate the effect on performance. Targeted analyses have been used to successfully gain approval of the following: 1) a reduction in the amount of magnesium oxide (MgO) chemical buffer backfill that must be emplaced in the repository 2) a change in the repository mining/disposal horizon In addition to these approved changes, the DOE has used PA analyses to support the following planned change requests that await EPA's approval: 1) panel closure redesign 2) further reduction in the MgO-to-waste ratio Finally, this paper will discuss some of the changes that the DOE is currently preparing and plans to submit to the EPA for approval in the near future. This paper will describe how a set of analytical tools initially used to open the WIPP continues to have a role in making the repository more efficient and adaptable as variations in waste streams, operational demands, and other dynamic forces change the operating environment over time. (authors)

Patterson, R. [Department of Energy, Carlsbad Field Office, Carlsbad, NM (United States); Kirkes, R. [John Hart and Associates, P.A., Albuquerque, NM (United States)

2008-07-01

396

A new calibration method for measuring acoustic transfer matrixes with flow and application to an automotive compressor  

NASA Astrophysics Data System (ADS)

A new method for measuring acoustic transfer matrixes with flow has been developed. It is based on two-load technique. Great improvements were obtained on specific calibration of the connections. We present here the calibration principles and validation. Measurements of basic resonating systems, first without flow then with flow up to Mach 0.2 clearly validated the accuracy of the technique, even under extreme flow conditions. This technique was developed to allow the determination of the acoustic behavior of an automotive engine intake line, comprising a compressor. Measurements of the transfer matrix of an automotive compressor are presented without flow then under realistic engine conditions. The results obtained are compared to those of a basic acoustic model of the compressor.

Rousselet, Benoit; Gibiat, Vincent; Guilain, Stéphane; Lefebvre, Alain

2014-12-01

397

Preparation of II-VI semiconductor nanocrystallites in a glass matrix using chalcogenizing agent: Application to CdSe  

SciTech Connect

A new route for preparing CdX (X = S, Se, Te, S+Se) nanocrystallites dispersed in a sodium borosilicate glass matrix from a hydrogel is proposed. Chalcogenizing complexing molecules -- for instance a mixture of NH{sub 4}SCN + H{sub 2}SeO{sub 3} -- introduced in the starting solution allowed an in situ crystallite preparation concomitant to gel densification. Prevention of crystallite oxidation is thus obtained. Moreover, coalescence is minimized because of the low gel-glass transition temperature. Low temperature absorption spectra have been interpreted in terms of exciton and electron-hole confinements, accounting for both an intrinsic broadening of energy states inside each nanocrystal and a Gaussian size distribution. Crystallite sizes and size dispersion can be adjusted by changing the initial Cd concentration. The crystallinity of the nanoparticles without change in dispersion is strongly improved by thermal treatment above the T{sub g} of the glass matrix.

Marc, J.L.; Granier, W.; Pradel, A.; Ribes, M.; Richard, T.; Allegre, J.; Lefebvre, P. [Univ. Montpellier-2 (France)

1994-12-31

398

Application of X-ray K-edge densitometry in D and D operations  

SciTech Connect

K-edge densitometry is a nondestructive assay technique which provides accurate measurement of heavy metal contamination in pipes, containers, and other items encountered in D and D operations. A prototype mobile K-edge instrument has been built and demonstrated in several applications. Results from measurements of uranium in pipes and spent reactor fuel plates, and quantification of mercury and lead in waste drums are presented. In this report the authors briefly describe the theory behind K-edge densitometry. They follow that with a description of the prototype system they have developed, and a presentation of results from demonstrations of this system. They conclude with a discussion of the potential for application of K-edge analysis in D and D operations.

Jensen, T.; Aljundi, T.; Gray, J.N. [Ames Lab., IA (United States)]|[Iowa State Univ., Ames, IA (United States). Center for NDE

1998-12-31

399

Application of mixture experimental design in the formulation and optimization of matrix tablets containing carbomer and hydroxy-propylmethylcellulose  

Microsoft Academic Search

Using mixture experimental design, the effect of carbomer (Carbopol® 971P NF) and hydroxypropylmethylcellulose (Methocel®\\u000a K100M or Methocel® K4M) combination on the release profile and on the mechanism of drug liberation from matrix tablet was\\u000a investigated. The numerical optimization procedure was also applied to establish and obtain formulation with desired drug\\u000a release. The amount of TP released, release rate and mechanism

Aleksandra Petrovic; Nebojsa Cvetkovic; Svetlana Ibric; Svetlana Trajkovic; Zorica Djuric; Dragica Popadic; Radmila Popovic

2009-01-01

400

Applications of Delayed Extraction Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry to Oligonucleotide Analysis  

Microsoft Academic Search

A delayed ion extraction technique is shown to dramati- cally improve mass resolution and the overall quality of matrix-assisted laser desorption ionization (MALDI) mass spectra of oligonucleotides. Isotope limited mass resolu- tion was obtained on samples up to 10-kDa molecular mass in linear mode, and as high as 7500 mass resolution (defined at half peak height) was observed in reflector

Peter Juhasz; Mark T. Roskey; Igor P. Smirnov; Lawrence A. Haff; Marvin L. Vestal; Stephen A. Martin

1996-01-01

401

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

402

Impact of Public Key Enabled Applications on the Operation and Maintenance of Commercial Airplanes  

Microsoft Academic Search

Making airplanes network-enabled can significantly increase the efficiency of aircraft manufacturing, operation and maintenance processes. Yet these benefits cannot be realized without addressing the potential for network-induced security threats. This paper addresses challenges that emerge for network-enabled airplanes that use public key cryptography-based applications. In particular, we focus on the electronic distribution of airplane software and data. We present both

Richard V. Robinson; Mingyan Li; Scott A. Lintelman; Krishna Sampigethaya; Radha Poovendran; David von Oheimb

403

A simplified application of the method of operators to the calculation disturbed motions of an airplane  

NASA Technical Reports Server (NTRS)

A simplified treatment of the application of Heaviside's operational methods to problems of airplane dynamics is given. Certain graphical methods and logarithmic formulas that lessen the amount of computation involved are explained. The problem of representing a gust disturbance or control manipulation is taken up and it is pointed out that in certain cases arbitrary control manipulations may be dealt with as though they imposed specific constraints on the airplane, thus avoiding the necessity of any integration whatever.

Jones, R. T.

1976-01-01

404

Polar Satellite Products for the Operational Forecaster (POES) Module 2: Microwave Products and Applications  

NSDL National Science Digital Library

This Web-based module is a component of the Integrated Sensor Training (IST) Professional Development Series (PDS) Professional Competency Unit #6-Satellite Data and Products. This module provides a closer look at the capabilities, products, and applications available to operational weather forecasting with the present suite of microwave instruments onboard both NOAA and DMSP satellites. If you wish, you may launch the module from this page.

Comet

1999-07-23

405

Local topological modification of hexahedral meshes using dual-based operations : progress and application.  

SciTech Connect

Local topological modification is widely used to improve mesh quality after automatic generation of tetrahedral and quadrilateral meshes. These same techniques are also used to support adaptive refinement of these meshes. In contrast, few methods are known for locally modifying the topology of hexahedral meshes. Most efforts to do this have been based on fixed transition templates or global refinement. In contrast, a dual-based 'pillowing' method has been used which, while local, is still quite restricted in its application, and is typically applied in a template-based fashion. In this presentation, I will describe the generalization of a dual-based approach to the local topological modification of hex meshes and its application to clean up hexahedral meshes. A set of three operations for locally modifying hex mesh topology has been shown to reproduce the so-called 'flipping' operations described by Bern et. al as well as other commonly-used refinement templates. I will describe the implementation of these operators and their application to real meshes. Challenging aspects of this work have included visualization of a hex mesh and its dual (especially for poor-quality meshes); the incremental modification of both the primal (i.e. the mesh) and the dual simultaneously; and the interactive steering of these operations with the goal of improving hex meshes which would otherwise have unacceptable quality. These aspects will be discussed in the context of improving hex meshes generated by curve contraction-based whisker weaving. Application of these techniques for improving other hexahedral mesh types, for example those resulting from tetrahedral subdivision, will also be discussed.

Tautges, Timothy James

2005-02-01

406

Operational Data for a Large Vertical Thrust Bearing in a Pumped Storage Application  

Microsoft Academic Search

This paper presents operating temperatures for a 2756 mm (108.5?) 10-shoe thrust bearing installed in a vertical turbine generator in a pumped storage application. The rated output of the generator is 350 MW at a rotational speed of 257 RPM. Temperature data will be presented for shaft speed up to 257 RPM and loads that ranged from 8.00 to 11.12

William S. Chambers; Andrew M. Mikula

1988-01-01

407

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

408

Matrix stone.  

PubMed

Matrix stone is a rare form of renal calculi, and it is often difficult to make an exact preoperative diagnosis. To our knowledge, we reported the first case of matrix stones which received magnetic resonance imaging (MRI) for image study. They showed hypointense signal in T1-weighted images and slight hyperintense signal in T2-weighted images. No obvious contrast enhancement was found after gadolinium administration in T1-weighted images. Besides, postoperative study of computerized tomography (CT) for matrix stones also showed the characteristic of soft tissue densities by measuring the Hounsfield units. We think our experiences may provide some help for the diagnosis of matrix stones when someone encounters the same situation and may prevent overtreatment due to misdiagnosis as malignancy. PMID:14501375

Liu, Chia-Chu; Li, Ching-Chia; Shih, Ming-Chen; Chou, Yii-Her; Huang, Chun-Hsiung

2003-01-01

409

43 CFR 3261.15 - Must I give BLM my drilling permit application, drilling program, and operations plan at the same...  

...application, drilling program, and operations plan at the same time? 3261...application, drilling program, and operations plan at the same time? ...and complete drilling program and operations plan either together or...

2014-10-01

410

43 CFR 3261.15 - Must I give BLM my drilling permit application, drilling program, and operations plan at the same...  

Code of Federal Regulations, 2012 CFR

...application, drilling program, and operations plan at the same time? 3261...application, drilling program, and operations plan at the same time? ...and complete drilling program and operations plan either together or...

2012-10-01

411

43 CFR 3261.15 - Must I give BLM my drilling permit application, drilling program, and operations plan at the same...  

Code of Federal Regulations, 2013 CFR

...application, drilling program, and operations plan at the same time? 3261...application, drilling program, and operations plan at the same time? ...and complete drilling program and operations plan either together or...

2013-10-01

412

43 CFR 3261.15 - Must I give BLM my drilling permit application, drilling program, and operations plan at the same...  

Code of Federal Regulations, 2011 CFR

...application, drilling program, and operations plan at the same time? 3261...application, drilling program, and operations plan at the same time? ...and complete drilling program and operations plan either together or...

2011-10-01

413

A new separable potential operator for representing a chemical bond and other applications  

NASA Astrophysics Data System (ADS)

A new type of potential operator has several kinds of applications in electronic structure calculations. Three uses are envisaged here. First when some special region of a covalently bonded solid or very large molecule is modeled by a modest sized cluster, each dangling bond at the cluster surface can be saturated in a way that exactly reproduces the bond in the complete system. Second a similar approach can be used at the matching surface in an embedding scheme for calculations on the same type of systems. The third application is to atomic pseudopotentials where the new potential operator avoids the possibility of ``ghost'' states that sometimes plague the widely used Kleinman-Bylander form of the pseudopotential. The theory of the new separable potential and its application to the dangling bond problem are the main subjects of the present paper. Starting from a given potential or pseudopotential, the new separable operator modifies some of the required eigenfunctions and eigenvalues in a controlled way while conserving all other eigenvalues. The method has been tested on the molecules X-SiH3 where X=H, F, Cl, Br, or I.

Abarenkov, I. V.; Tupitsyn, I. I.

2001-07-01

414

10 CFR 2.404 - Hearings on applications for operating licenses pursuant to appendix N of 10 CFR part 50.  

Code of Federal Regulations, 2010 CFR

...Additional Procedures Applicable to Proceedings for the Issuance of Licenses To Construct and/or Operate Nuclear Power Plants of Identical Design at Multiple Sites § 2.404 Hearings on applications for operating licenses pursuant to appendix N of 10 CFR...

2010-01-01

415

Some implications of the application or removal of agency seals by facility operators  

SciTech Connect

This report is the outcome of a study of the technical and procedural requirements which would need to be met if the Agency and facility operators were to agree that under certain circumstances the operator could remove or apply on Agency seal in the absence of an inspector. In the FRG and USA Support Programmes respectively an electronic seal (VACOSS) and a CCTV system (MIVS) have been developed. Through a joint project, an interface has been demonstrated which enables the seal data to be superimposed upon the surveillance data. This interface is briefly described in the appendix. A proposed application for this integrated system is to allow facility operators to carry-out some of the seal procedures normally performed by an inspector, thereby reducing the need for inspector presence at certain crucial times.

Walford, F. (UKAEA Atomic Energy Research Establishment, Harwell (UK)); Drayer, D.D.; Sonnier, C.S. (Sandia National Labs., Albuquerque, NM (USA))

1990-04-01

416

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. PMID:11583981

Sheridan, Carl M.; Occleston, Nick L.; Hiscott, Paul; Kon, Chee H.; Khaw, Peng T.; Grierson, Ian

2001-01-01

417

From R&D to end users applications in operational oceanography: The navy's "SOAP" case study  

NASA Astrophysics Data System (ADS)

For the last ten years, the CMO/BRESM has conducted an operational program for Ocean Analysis and Prediction SOAP, whose goal has been to support sea activities with high resolution mesoscale ocean nowcast products. Successive prototypes have been generated, operated and improved in tandem with a continuous re-evaluation of Navy Needs. This strategy played a key-role in defining the concept of “real-time integrated oceanography” which relies on remote and in situ ocean observations, (a hierarchy of) ocean models and data assimilation methods. The paper focuses on the results of the latter feasability study for next SOAP prototype: the military motivation for developing new prototypes is to extend the application domain of SOAP operational products from the operative (~ a description of the synoptic scale) to the tactical ( ~ a tailored product to strategic needs) relevance. Current SOAP P2 system is as a transition system pulled by end-user’s requirements and designed by research oceanographers from existing tools and models. The development of SOAP P3 has just started and will benefit from the emergence of an increasing offer of ocean modelling results, pushed by the GODAE initiative. It will be based on MERCATOR high resolution prototypes. From that starting point future developments will have to address both issues of defense specific requirements for high resolution ocean modeling and computation of relevant acoustical products for military applications. Especially, the crucial needs for assessing the end-users’ products reliability should be explored.

Giraud Saint-Albin, S.; Jourdan, D.

2003-04-01

418

Application of submarine extended operating cycle programs to the enhancement of commercial nuclear power plant operation and maintenance  

Microsoft Academic Search

During the past 10 yr, the US Navy has extended submarine operating cycles - the period between major ship overhauls - from 4 to > 15 yr. Major programs to extend submarine operating cycles have been the submarine extended operating cycle (SEOC) and the engineered SEOC programs. Currently, the navy is incorporating lessons learned from these programs, as well as

J. H. Mason; B. K. Livingston; E. J. Clarke

1988-01-01

419

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

Code of Federal Regulations, 2010 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...

2010-10-01

420

Applicability of ultrasonic testing for the determination of volume fraction of particulates in alumina-reinforced aluminum matrix composites  

SciTech Connect

An ultrasonic testing technique was employed to determine the volume fraction of alumina particulate reinforcement in 6061 aluminum matrix composites. this study was performed on various composites with Al{sub 2}O{sub 3} nominal volume fractions of 10, 15, and 20%. For comparison, other techniques were employed as well, including the Archimedes method, metallographic image analysis, X-ray diffraction, and acid dissolution. Observations indicated that ultrasonic testing and acid dissolution methods are more reliable than the other techniques, while ultrasonic testing is faster than the acid dissolution method.

Fang, C.K.; Fang, R.L.; Weng, W.P.; Chuang, T.H.

1999-10-01

421

Extracellular matrix.  

PubMed

A succinct overview of recent results on the biochemistry of extracellular matrix (ECM) is presented. The rapid expansion of this discipline over the best decades renders impossible to give an even approximately complete coverage of matrix biology. Some selected results concerning the four major families of macromolecules composing the ECM, that is, collagens (14 types described), elastin(s), proteoglycans and structural glycoproteins (especially fibronectin) are described. Special attention is directed to a crucial aspect of matrix biology: cell-matrix interactions. A number of cell membrane receptors were recently described mediating the two way information flow from the cells to the matrix via the 'programme' of ECM synthesis coded in the genome and unfolding during differentiation and from the ECM to the cells through the membrane receptors which contact the cytoskeleton. One of them at least, the elastin receptor was shown to be linked through a G-protein-phospholipase C-IP3 mediated relay to the regulation of intracellular calcium. Modifications of the ECM will therefore influence cell behaviour. Derangements of this informational feed back mechanisms appear to be involved in most age-related connective tissue diseases. PMID:2166694

Labat-Robert, J; Bihari-Varga, M; Robert, L

1990-08-01

422

Optimal design and operation of solid oxide fuel cell systems for small-scale stationary applications  

NASA Astrophysics Data System (ADS)

The advent of maturing fuel cell technologies presents an opportunity to achieve significant improvements in energy conversion efficiencies at many scales; thereby, simultaneously extending our finite resources and reducing "harmful" energy-related emissions to levels well below that of near-future regulatory standards. However, before realization of the advantages of fuel cells can take place, systems-level design issues regarding their application must be addressed. Using modeling and simulation, the present work offers optimal system design and operation strategies for stationary solid oxide fuel cell systems applied to single-family detached dwellings. A one-dimensional, steady-state finite-difference model of a solid oxide fuel cell (SOFC) is generated and verified against other mathematical SOFC models in the literature. Fuel cell system balance-of-plant components and costs are also modeled and used to provide an estimate of system capital and life cycle costs. The models are used to evaluate optimal cell-stack power output, the impact of cell operating and design parameters, fuel type, thermal energy recovery, system process design, and operating strategy on overall system energetic and economic performance. Optimal cell design voltage, fuel utilization, and operating temperature parameters are found using minimization of the life cycle costs. System design evaluations reveal that hydrogen-fueled SOFC systems demonstrate lower system efficiencies than methane-fueled systems. The use of recycled cell exhaust gases in process design in the stack periphery are found to produce the highest system electric and cogeneration efficiencies while achieving the lowest capital costs. Annual simulations reveal that efficiencies of 45% electric (LHV basis), 85% cogenerative, and simple economic paybacks of 5--8 years are feasible for 1--2 kW SOFC systems in residential-scale applications. Design guidelines that offer additional suggestions related to fuel cell-stack sizing and operating strategy (base-load or load-following and cogeneration or electric-only) are also presented.

Braun, Robert Joseph

423

Aluminum matrix composites and their superplasticity  

SciTech Connect

This paper introduces in simple terms manufacturing methods associated with aluminum matrix composite materials, superplasticity research as well as its applications, and probes structural faults during the manufacturing of aluminum matrix composite materials. In conjunction with this, it brings together a crossing of subjects to expound on trends in the development of research on aluminum matrix composite material superplasticity and its applications.

Tang, C.; Li, S.; Li, H.

1995-05-26

424

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

2009-01-01

425

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

426

A Mixed Prioritization Operators Strategy Using A Single Measurement Criterion For AHP Application Development  

NASA Astrophysics Data System (ADS)

The most appropriate prioritization method is still one of the unsettled issues of the Analytic Hierarchy Process, although many studies have been made and applied. Interestingly, many AHP applications apply only Saaty's Eigenvector method as many studies have found that this method may produce rank reversals and have proposed various prioritization methods as alternatives. Some methods have been proved to be better than the Eigenvector method. However, these methods seem not to attract the attention of researchers. In this paper, eight important prioritization methods are reviewed. A Mixed Prioritization Operators Strategy (MPOS) is developed to select a vector which is prioritized by the most appropriate prioritization operator. To verify this new method, a case study of high school selection is revised using the proposed method. The contribution is that MPOS is useful for solving prioritization problems in the AHP.

Yuen, Kevin Kam Fung

2009-10-01

427

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

428

Seventh Annual Workshop on Space Operations Applications and Research (SOAR 1993), volume 1  

NASA Technical Reports Server (NTRS)

This document contains papers presented at the Space Operations, Applications and Research Symposium (SOAR) Symposium hosted by NASA/Johnson Space Center (JSC) on August 3-5, 1993, and held at JSC Gilruth Recreation Center. SOAR included NASA and USAF programmatic overview, plenary session, panel discussions, panel sessions, and exhibits. It invited technical papers in support of U.S. Army, U.S. Navy, Department of Energy, NASA, and USAF programs in the following areas: robotics and telepresence, automation and intelligent systems, human factors, life support, and space maintenance and servicing. SOAR was concerned with Government-sponsored research and development relevant to aerospace operations. More than 100 technical papers, 17 exhibits, a plenary session, several panel discussions, and several keynote speeches were included in SOAR '93.

Krishen, Kumar (editor)

1994-01-01

429

Matrix assisted pulsed laser evaporation of cinnamate-pullulan and tosylate-pullulan polysaccharide derivative thin films for pharmaceutical applications  

NASA Astrophysics Data System (ADS)

We have demonstrated the successful thin film growth of two pullulan derivatives (cinnamate-pullulan and tosylate-pullulan) using matrix assisted pulsed laser evaporation (MAPLE). Our MAPLE system consisted of a KrF* laser, a vacuum chamber, and a rotating target holder cooled with liquid nitrogen. Fused silica and silicon (1 1 1) wafers were used as substrates. The MAPLE-deposited thin films were characterized by transmission spectrometry, profilometry, atomic force microscopy (AFM), Fourier transform infrared (FTIR) spectroscopy and Raman spectroscopy. The deposited layers ranged from 250 nm to 16.5 ?m in thickness, depending on the laser fluence (0.065-0.5 J cm -2) and number of pulses applied for the deposition of one structure (1500-13,300). Our results confirmed that MAPLE was well-suited for the transfer of cinnamate-pullulan and tosylate-pullulan.

Jelinek, M.; Cristescu, R.; Axente, E.; Kocourek, T.; Dybal, J.; Remsa, J.; Plestil, J.; Mihaiescu, D.; Albulescu, M.; Buruiana, T.; Stamatin, I.; Mihailescu, I. N.; Chrisey, D. B.

2007-07-01

430

An application of matrix generalized inverses to optimal control problems of linear time-invariant discrete-time systems  

SciTech Connect

Consider the time system Ex(k + 1) = Ax(k) + Bu(k) where E is a singular square matrix. It is assumed that the system is either a priori regular i is regularizable by a feedback law of the form u(k) = Ky(k) + V(k). or it The problem is this: Find an input sequence which will drive x(k) from a given x(0) to a desired {open_quotes}final vector{close_quotes} x(N) in a given number of steps N while minimizing the cost. The novelty of this paper`s approach is the use of singular-value decomposition and of weighted generalized inverses.

Al-Humadi, A. [Embry-Riddle Aeronautical Univ., Daytona Beach, FL (United States)

1994-12-31

431

Numerical simulation of macrostructure formation in centrifugal casting of particle reinforced metal matrix composites. Part 2: simulations and practical applications  

NASA Astrophysics Data System (ADS)

Centrifugal casting is a widely applied method for production of graded metal matrix composites (MMCs). This paper discusses some aspects of the macrostructure management of centrifugally cast particle reinforced MMCs. A specially developed software product is applied for the analysis of many technological regimes for casting cylindrical sleeves of composite alloy A356 and SiC particles as reinforcing phase. A number of technological recommendations are made. Castings of aluminium alloy A356 and copper alloy C90300 with Ni coated graphite particles of diameter 100 mum introduced as reinforcing phase are discussed. Some typical and unusual casting structures are analysed using the specially developed software product. This software is based on the mathematical model described in detail in part 1.

Drenchev, Ludmil; Sobczak, Jerzy; Malinov, Savko; Sha, Wei

2003-07-01

432

Calculation of quasi particle energies using a spectral decomposition of the static dielectric matrix: application to molecules and nanoparticles  

NASA Astrophysics Data System (ADS)

We present a novel approach to evaluate quasi particle energies within many body perturbation theory, that substantially improves both the computational efficiency and the numerical accuracy of existing techniques.ootnotetextHuy-Viet Nguyen, T. Anh Pham, D. Rocca and G. Galli (preprint). We use a spectral decomposition of the static dielectric matrix as a basis for the frequency dependent density-density response function, and density functional perturbation theory to avoid the explicit calculation of empty electronic states. A Lanczos-chain algorithm is employed that allows for the evaluation of spectra over a wide frequency range. The numerical accuracy of computed quasi particle energies is controlled by a single parameter. The efficiency and accuracy of our approach are demonstrated by computing vertical ionization potentials and electron affinities of several molecules and diamondoids. Our results are in good agreement with experiment and those reported in the literature using Quantum Monte Carlo calculations.

Pham, T. Anh; Nguyen, Huy-Viet; Rocca, Dario; Galli, Giulia

2012-02-01

433

Application of transfer matrix method in heat transfer performance analysis of multi-re-entrant honeycomb structures  

NASA Astrophysics Data System (ADS)

The thermal properties for the multi-re-entrant honeycomb are investigated, where the hexagon and re-entrant topologies are applied for comparison. A compact model was adopted for the local heat transfer rate and pressure drop estimations while the total heat transfer rate was analyzed using the transfer matrix method. A thermal performance index was specified to characterize a good heat exchange medium that can transfer more heat at the expense of lower pressure loss. Numerical results reveal better thermal performances of multi-re-entrant honeycombs over hexagon and re-entrant topologies, attributed to the presence of added base walls. Auxetic effect introduced in multi-re-entrant honeycomb generally provides enhanced out-of-plane thermal conductivity and increased total heat transfer efficiency due to higher surface area density.

Hou, Xiuhui; Deng, Zichen; Yin, Guansheng

2014-12-01

434

Effect of apoptosis and response of extracellular matrix proteins after chemotherapy application on human breast cancer cell spheroids.  

PubMed

Multicellular tumor spheroid (MTS) represents a three-dimensional structural form of tumors in laboratory conditions, and it has the characteristics of avascular micrometastases or intervascular spaces of big tumors. Recent studies indicate that extracellular matrix (ECM) proteins play a critical role in tumor metastasis, therefore normal and cancer cells require an ECM for survival, proliferation and differentiation. Doxorubicin and Docetaxel are widely used in the therapy of breast cancer, as well as in in vivo and in vitro studies. In this study, we examined the effect of apoptosis and proliferation of cells on the human breast cancer cell line, MCF-7, by using p53, bcl-2 and Ki67 gene expression, and the tendency to metastasis with extracellular matrix proteins, laminin and type IV collagen after chemotherapy in the spheroid model. The apoptotic cell death in situ was detected by TUNEL method. TUNEL-positive cells and positive immunoreactivities of laminin, type IV collagen, p53 and, bcl-2 were detected in the control group. There was no laminin and type IV collagen immunoreactivities in spheroids of drug groups. While TUNEL-positive cells and p53 immunoreactivity were detected in Docetaxel, Doxorubicin and Docetaxel/Doxorubicin groups, p53 immunoreactivity was not observed in the Docetaxel group. There was no bcl-2 immunoreactivity in either drug group. In addition, we did not detect Ki67 immunoreactivity in both control and drug treatment groups. However, the absence of Ki67 protein in MCF-7 breast multicellular tumor spheroids is possibly related to the cells in G0 or S phase. These chemotherapeutic agents may affect the presence of ECM proteins in this in vitro model of micrometastasis of spheroids. These findings suggest that the possible mechanism of cell death in Doxorubicin and Docetaxel/Doxorubicin treatment groups is related to apoptosis through the p53 pathway. However, we considered the possibility that there is another control mechanism for the Docetaxel group. PMID:16391851

Oktem, G; Vatansever, S; Ayla, S; Uysal, A; Aktas, S; Karabulut, B; Bilir, A

2006-02-01

435

Towards the geometric optimization of potential field models - A new spatial operator tool and applications  

NASA Astrophysics Data System (ADS)

We present a new method for automated geometric modifications of potential field models. Computational developments and the increasing amount of available potential field data, especially gradient data from the satellite missions, lead to increasingly complex models and integrated modelling tools. Editing of these models becomes more difficult. Our approach presents an optimization tool that is designed to modify vertex-based model geometries (e.g. polygons, polyhedrons, triangulated surfaces) by applying spatial operators to the model that use an adaptive, on-the-fly model discretization. These operators deform the existing model via vertex-dragging, aiming at a minimized misfit between measured and modelled potential field anomaly. The parameters that define the operators are subject to an optimization process. This kind of parametrization provides a means for the reduction of unknowns (dimensionality of the search space), allows a variety of possible modifications and ensures that geometries are not destroyed by crossing polygon lines or punctured planes. We implemented a particle swarm optimization as a global searcher with restart option for the task of finding optimal operator parameters. This approach provides us with an ensemble of model solutions that allows a selection and geologically reasonable interpretations. The applicability of the tool is demonstrated in two 2D case studies that provide models of different extent and with different objectives. The first model is a synthetic salt structure in a horizontally layered background model. Expected geometry modifications are considerably small and localized and the initial models contain rather little information on the intended salt structure. A large scale example is given in the second study. Here, the optimization is applied to a sedimentary basin model that is based on seismic interpretation. With the aim to evaluate the seismically derived model, large scale operators are applied that mainly cause depth adjustments to the model horizons.

Haase, Claudia; Götze, Hans-Jürgen

2014-05-01

436

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

437

Application of First Principles Ni-Cd and Ni-H2 Battery Models to Spacecraft Operations  

NASA Technical Reports Server (NTRS)

The conclusions of the application of first principles model to spacecraft operations are: the first principles of Bi-phasic electrode presented model provides an explanation for many behaviors on voltage fading on LEO cycling.

Timmerman, Paul; Bugga, Ratnakumar; DiStefano, Salvador

1997-01-01

438

26 CFR 1.1502-21A - Consolidated net operating loss deduction generally applicable for consolidated return years...  

Code of Federal Regulations, 2011 CFR

...Consolidated net operating loss deduction generally applicable for consolidated return years beginning before January 1, 1997. 1.1502-21A Section 1.1502-21A Internal Revenue INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED)...

2011-04-01

439

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

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Surface mining permit application-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2013-07-01

440

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

Code of Federal Regulations, 2013 CFR

... 2013-07-01 false Underground mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE NORTH...

2013-07-01

441

30 CFR 937.784 - Underground mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2012 CFR

... 2012-07-01 false Underground mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE OREGON...

2012-07-01

442

30 CFR 910.784 - Underground mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2011 CFR

... 2011-07-01 false Underground mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2011-07-01

443

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

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Surface mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2013-07-01

444

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

Code of Federal Regulations, 2011 CFR

...2011-07-01 2011-07-01 false Surface mining permit application-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2011-07-01

445

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

Code of Federal Regulations, 2012 CFR

... 2012-07-01 false Underground mining permit applications-Minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2012-07-01

446

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

Code of Federal Regulations, 2012 CFR

...2012-07-01 2012-07-01 false Surface mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE SOUTH...

2012-07-01

447

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

Code of Federal Regulations, 2012 CFR

... 2012-07-01 false Underground mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2012-07-01

448

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

Code of Federal Regulations, 2011 CFR

... 2011-07-01 false Underground mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2011-07-01

449

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

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Surface mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE SOUTH...

2013-07-01

450

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

Code of Federal Regulations, 2013 CFR

... 2013-07-01 false Underground mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2013-07-01

451

30 CFR 939.784 - Underground mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2012 CFR

... 2012-07-01 false Underground mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE RHODE...

2012-07-01

452

30 CFR 910.784 - Underground mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2012 CFR

... 2012-07-01 false Underground mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2012-07-01

453

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

Code of Federal Regulations, 2013 CFR

... 2013-07-01 false Underground mining permit applications-Minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2013-07-01

454

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

Code of Federal Regulations, 2013 CFR

... 2013-07-01 false Underground mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2013-07-01

455

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

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Surface mining permit applications-Minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2013-07-01

456

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

Code of Federal Regulations, 2013 CFR

... 2013-07-01 false Underground mining permit applications-Minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2013-07-01

457

30 CFR 910.784 - Underground mining permit applications-minimum requirements for reclamation and operation plan.  

Code of Federal Regulations, 2013 CFR

... 2013-07-01 false Underground mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2013-07-01

458

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

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Surface mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE OREGON...

2010-07-01

459

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

Code of Federal Regulations, 2010 CFR

... 2010-07-01 false Underground mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE IDAHO...

2010-07-01

460

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

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Surface mining permit applications-Minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE...

2010-07-01