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

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

3

Living Links: Applications of Matrix Operations to Population Studies

NSDL National Science Digital Library

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

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

4

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

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

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

2010-06-28

5

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

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

7

NASA Astrophysics Data System (ADS)

An efficient method for the numerical solution of a non-Markovian, open-system density matrix equation of motion in coordinate representation is developed. We apply the scheme to model simulations of the laser-assisted O+H?OH association reaction in an environment. The suggested approach is based on the application of the time-evolution operator to the “closed-system” part of the overall Hamiltonian and transformation of the open-system equation of motion to the Heisenberg picture suitable for numerical propagation. A dual role of the system-environment coupling with respect to the infrared (ir) laser-driven association of OH is demonstrated: the association probability is increased due to the coupling at relatively weak laser fields, but decreased at strong laser fields. Moreover, at a certain strength of the ir laser field, the association probability does not depend on the strength of the system-bath coupling at all.

Paramonov, G. K.; Saalfrank, Peter

2009-01-01

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

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

Nemirovski, Arkadi

10

NASA Astrophysics Data System (ADS)

1-D radiative transfer code Matrix-Operator Model (MOMO), has been extended from [0.2-3.65 ?m] the band to the whole [0.2-100 ?m] spectrum. MOMO can now be used for the computation of a full range of radiation budgets (shortwave and longwave). This extension to the longwave part of the electromagnetic radiation required to consider radiative transfer processes that are features of the thermal infrared: the spectroscopy of the water vapor self- and foreign-continuum of absorption at 12 ?m and the emission of radiation by gases, aerosol, clouds and surface. MOMO's spectroscopy module, Coefficient of Gas Absorption (CGASA), has been developed for computation of gas extinction coefficients, considering continua and spectral line absorptions. The spectral dependences of gas emission/absorption coefficients and of Planck's function are treated using a k-distribution. The emission of radiation is implemented in the adding-doubling process of the matrix operator method using Schwarzschild's approach in the radiative transfer equation (a pure absorbing/emitting medium, namely without scattering). Within the layer, the Planck-function is assumed to have an exponential dependence on the optical-depth. In this paper, validation tests are presented for clear air case studies: comparisons to the analytical solution of a monochromatic Schwarzschild's case without scattering show an error of less than 0.07% for a realistic atmosphere with an optical depth and a blackbody temperature that decrease linearly with altitude. Comparisons to radiative transfer code RTTOV are presented for simulations of top of atmosphere brightness temperature for channels of the space-borne instrument MODIS. Results show an agreement varying from 0.1 K to less than 1 K depending on the channel. Finally MOMO results are compared to CALIPSO Infrared Imager Radiometer (IIR) measurements for clear air cases. A good agreement was found between computed and observed radiance: biases are smaller than 0.5 K and Root Mean Square Error (RMSE) varies between 0.4 K and 0.6 K depending on the channel. The extension of the code allows the utilization of MOMO as forward model for remote sensing algorithms in the full range spectrum. Another application is full range radiation budget computations (heating rates or forcings).

Doppler, Lionel; Carbajal-Henken, Cintia; Pelon, Jacques; Ravetta, François; Fischer, Jürgen

2014-09-01

11

Modulation and control of matrix converter for aerospace application

NASA Astrophysics Data System (ADS)

In the context of modern aircraft systems, a major challenge is power conversion to supply the aircraft's electrical instruments. These instruments are energized through a fixed-frequency internal power grid. In an aircraft, the available sources of energy are a set of variable-speed generators which provide variable-frequency ac voltages. Therefore, to energize the internal power grid of an aircraft, the variable-frequency ac voltages should be converted to a fixed-frequency ac voltage. As a result, an ac to ac power conversion is required within an aircraft's power system. This thesis develops a Matrix Converter to energize the aircraft's internal power grid. The Matrix Converter provides a direct ac to ac power conversion. A major challenge of designing Matrix Converters for aerospace applications is to minimize the volume and weight of the converter. These parameters are minimized by increasing the switching frequency of the converter. To design a Matrix Converter operating at a high switching frequency, this thesis (i) develops a scheme to integrate fast semiconductor switches within the current available Matrix Converter topologies, i.e., MOSFET-based Matrix Converter, and (ii) develops a new modulation strategy for the Matrix Converter. This Matrix Converter and the new modulation strategy enables the operation of the converter at a switching-frequency of 40kHz. To provide a reliable source of energy, this thesis also develops a new methodology for robust control of Matrix Converter. To verify the performance of the proposed MOSFET-based Matrix Converter, modulation strategy, and control design methodology, various simulation and experimental results are presented. The experimental results are obtained under operating condition present in an aircraft. The experimental results verify the proposed Matrix Converter provides a reliable power conversion in an aircraft under extreme operating conditions. The results prove the superiority of the proposed Matrix Converter technology for ac to ac power conversion regarding the existing technologies of Matrix Converters.

Kobravi, Keyhan

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

Spectral analysis of nonselfadjoint Schrödinger operators with a matrix potential

NASA Astrophysics Data System (ADS)

Dissipative Schrödinger operators with a matrix potential are studied in L2((0,[infinity]);E) (dimE=n<[infinity]) which are extension of a minimal symmetric operator L0 with defect index (n,n). A selfadjoint dilation of a dissipative operator is constructed, using the Lax-Phillips scattering theory, the spectral analysis of a dilation is carried out, and the scattering matrix of a dilation is founded. A functional model of the dissipative operator is constructed and its characteristic function's analytic properties are determined, theorems on the completeness of eigenvectors and associated vectors of a dissipative Schrödinger operator are proved.

Saltan, Suna; Allahverdiev, Bilender P.

2005-03-01

14

From nucleon-nucleon interaction matrix elements in momentum space to an operator representation

Starting from the matrix elements of the nucleon-nucleon interaction in momentum space we present a method to derive an operator representation with a minimal set of operators that is required to provide an optimal description of the partial waves with low angular momentum. As a first application we use this method to obtain an operator representation for the Argonne potential transformed by means of the unitary correlation operator method and discuss the necessity of including momentum dependent operators. The resulting operator representation leads to the same results as the original momentum space matrix elements when applied to the two-nucleon system and various light nuclei. For applications in fermionic and antisymmetrized molecular dynamics, where an operator representation of a soft but realistic effective interaction is indispensable, a simplified version using a reduced set of operators is given.

D. Weber; H. Feldmeier; H. Hergert; T. Neff

2014-04-03

15

Metal Matrix Composite Materials for Aerospace Applications

NASA Technical Reports Server (NTRS)

Metal matrix composites (MMC) are attractive materials for aerospace applications because of their high specific strength, high specific stiffness, and lower thermal expansion coefficient. They are affordable since complex parts can be produced by low cost casting process. As a result there are many commercial and Department of Defense applications of MMCs today. This seminar will give an overview of MMCs and their state-of-the-art technology assessment. Topics to be covered are types of MMCs, fabrication methods, product forms, applications, and material selection issues for design and manufacture. Some examples of current and future aerospace applications will also be presented and discussed.

Bhat, Biliyar N.; Jones, C. S. (Technical Monitor)

2001-01-01

16

Active matrix OLED for rugged HMD and viewfinder applications

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

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

2004-01-01

17

Automation of Nested Matrix and Derivative Operations Robert Kalaba

Automation of Nested Matrix and Derivative Operations Robert Kalaba Departments of Electrical the automatic differentiation of hmctions expressed in terms of the derivatives d other fimctions. Building is introduced for the systematic exact evaluation of higher-order partial derivatives. Building on a key idea

Tesfatsion, Leigh

18

On the real matrix representation of PT-symmetric operators

We discuss the construction of real matrix representations of PT-symmetric operators. We show the limitation of a general recipe presented some time ago for non-Hermitian Hamiltonians with antiunitary symmetry and propose a way to overcome it. Our results agree with earlier ones for a particular case.

Francisco M. Fernández

2014-04-15

19

POLYNOMIAL AND RATIONAL MATRIX INTERPOLATION: SYSTEMS AND CONTROL APPLICATIONS

POLYNOMIAL AND RATIONAL MATRIX INTERPOLATION: SYSTEMS AND CONTROL APPLICATIONS Panos J. Antsaklis.ece.nd.edu Abstract: In this paper, a theory of polynomial and rational matrix interpolation is hintrodued and applied. Rational matrix interpolation is also discussed and it is used to solve rational matrix equations including

Antsaklis, Panos

20

Applications of Polymer Matrix Syntactic Foams

NASA Astrophysics Data System (ADS)

A collection of applications of polymer matrix syntactic foams is presented in this article. Syntactic foams are lightweight porous composites that found their early applications in marine structures due to their naturally buoyant behavior and low moisture absorption. Their light weight has been beneficial in weight sensitive aerospace structures. Syntactic foams have pushed the performance boundaries for composites and have enabled the development of vehicles for traveling to the deepest parts of the ocean and to other planets. The high volume fraction of porosity in syntactic foams also enabled their applications in thermal insulation of pipelines in oil and gas industry. The possibility of tailoring the mechanical and thermal properties of syntactic foams through a combination of material selection, hollow particle volume fraction, and hollow particle wall thickness has helped in rapidly growing these applications. The low coefficient of thermal expansion and dimensional stability at high temperatures are now leading their use in electronic packaging, composite tooling, and thermoforming plug assists. Methods have been developed to tailor the mechanical and thermal properties of syntactic foams independent of each other over a wide range, which is a significant advantage over other traditional particulate and fibrous composites.

Gupta, Nikhil; Zeltmann, Steven E.; Shunmugasamy, Vasanth Chakravarthy; Pinisetty, Dinesh

2013-11-01

21

R-matrix parameters in reactor applications

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

Hwang, R.N.

1992-01-01

22

On integrable matrix product operators with bond dimension D = 4

NASA Astrophysics Data System (ADS)

We construct and study a two-parameter family of matrix product operators of bond dimension D = 4. The operators M(x, y) act on ({\\Bbb{C}}_2)\\otimes N , i.e. the space of states of a spin-1/2 chain of length N. For the particular values of the parameters: x = 1/3 and y=1/\\sqrt{3} , the operator turns out to be proportional to the square root of the reduced density matrix of the valence-bond-solid state on a hexagonal ladder. We show that M(x, y) has several interesting properties when (x, y) lies on the unit circle centered at the origin: x2 + y2 = 1. In this case, we find that M(x, y) commutes with the Hamiltonian and all the conserved charges of the isotropic spin-1/2 Heisenberg chain. Moreover, M(x1, y1) and M(x2, y2) are mutually commuting if x^2i + y^2_i=1 for both i = 1 and 2. These remarkable properties of M(x, y) are proved as a consequence of the Yang–Baxter equation.

Katsura, Hosho

2015-01-01

23

NASA Astrophysics Data System (ADS)

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

Shizgal, Bernie D.; Dridi, Raouf

2010-09-01

24

Matrix product operators for symmetry-protected topological phases

Projected entangled pair states (PEPS) provide a natural description of the ground states of gapped, local Hamiltonians in which global characteristics of a quantum state are encoded in properties of local tensors. We show that on-site symmetries, as occurring in systems exhibiting symmetry-protected topological (SPT) quantum order, can be captured by a virtual symmetry of the tensors expressed as a set of matrix product operators labelled by the different group elements. A classification of SPT phases can hence be obtained by studying the topological obstructions to continuously deforming one set of matrix product operators into another. This leads to the classification of bosonic SPT states in terms of group cohomology, as originally derived by Chen et al. in [1106.4772]. Our formalism accommodates perturbations away from fixed point models, and hence opens up the possibility of studying phase transitions between different SPT phases. We furthermore show how the global symmetries of SPT PEPS can be promoted into a set of local gauge constraints by introducing bosonic degrees of freedom on the links of the PEPS lattice, thereby providing a natural and general mapping between PEPS in SPT phases and topologically ordered phases.

Dominic J. Williamson; Nick Bultinck; Michael Mariën; Mehmet B. Sahinoglu; Jutho Haegeman; Frank Verstraete

2014-12-17

25

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

26

Dense and Sparse Matrix Operations on the Cell Processor

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

27

The Integral Transport Matrix Method (ITMM) has been shown to be an effective method for solving the neutron transport equation in large domains on massively parallel architectures. In the limit of very large number of processors, the speed of the algorithm, and its suitability for unstructured meshes, i.e. other than an ordered Cartesian grid, is limited by the construction of four matrix operators required for obtaining the solution in each sub-domain. The existing algorithm used for construction of these matrix operators, termed the differential mesh sweep, is computationally expensive and was developed for a structured grid. This work proposes the use of a new algorithm for construction of these operators based on the construction of a single, fundamental matrix representing the transport of a particle along every possible path throughout the sub-domain mesh. Each of the operators is constructed by multiplying an element of this fundamental matrix by two factors dependent only upon the operator being constructed and on properties of the emitting and incident cells. The ITMM matrix operator construction time for the new algorithm is demonstrated to be shorter than the existing algorithm in all tested cases with both isotropic and anisotropic scattering considered. While also being a more efficient algorithm on a structured Cartesian grid, the new algorithm is promising in its geometric robustness and potential for being applied to an unstructured mesh, with the ultimate goal of application to an unstructured tetrahedral mesh on a massively parallel architecture. (authors)

Powell, B. P.; Azmy, Y. Y. [North Carolina State University, Department of Nuclear Engineering, Burlington Engineering Labs, 2500 Stinston Drive, Raleigh, NC 27695 (United States)

2013-07-01

28

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

29

Polynomial Matrix Decompositions: Algorithms and Applications

and with different delays Polynomial mixing matrix required, where each element is an FIR filter More realistic multichannel all-pass filter): Az=Az Hz H z= Hz H z=I A z = A Â¿ T 1/z det[ Az]=constant #12;7 http://www the decompositions Motivation: the QR decomposition in narrowband signal processing a11 a21 a22 a12 x1 x2 y1 y2 [y1 y

Davies, Christopher

30

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

Active matrix OLED for rugged HMD and viewfinder applications

NASA Astrophysics Data System (ADS)

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

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

2004-09-01

32

Arecibo Technical & Operations Memo ATOMS 2000-05 THE MUELLER MATRIX PARAMETERS FOR ARECIBO2 introduces the Stokes parameters, Mueller matrix, and Jones vector and matrix. x3 de#12;nes of all of Arecibo's receiver systems. This memo describes a new method of deriving the Mueller matrices

33

Arecibo Technical & Operations Memo ATOMS 2000Â04 THE MUELLER MATRIX PARAMETERS FOR ARECIBO introduces the Stokes parameters, Mueller matrix, and Jones vector and matrix. x3 defines the Mueller's receiver systems. This memo describes a new method of deriving the Mueller matrices and describes

Heiles, Carl

34

Sparse matrix technology and its application in astrometric and geodetic VLBI data analysis

NASA Astrophysics Data System (ADS)

Some ordinary forms of sparse matrix and the application of sparse matrix technology in astrometric and geodetic VLBI data analysis are introduced. The algorithm of parameter solution and the covariance matrix calculation in the astrometric and geodetic VLBI data reduction are deduced. Based on the estimation and comparison of the number of operations in solving the observation equations by using the sparse matrix technology and by a straightforward least square adjustment (LSQ), it was shown that the number of operations is approximately proportional to the cube of the total number of parameters for the straightforward LSQ solution, while it is about linearly proportional to the total number of parameters for the algorithms which remarkably decrease the computer time in the reduction of the modern space geodetic observations characterized by huge amount.

Zhang, Bo

35

Efficient O(N) recursive computation of the operational space inertial matrix

The operational space inertia matrix {Lambda} reflects the dynamic properties of a robot manipulator to its tip. In the control domain, it may be used to decouple force and/or motion control about the manipulator workspace axes. The matrix {Lambda} also plays an important role in the development of efficient algorithms for the dynamic simulation of closed-chain robotic mechanisms, including simple closed-chain mechanisms such as multiple manipulator systems and walking machines. The traditional approach used to compute {Lambda} has a computational complexity of O(N{sup 3}) for an N degree-of-freedom manipulator. This paper presents the development of a recursive algorithm for computing the operational space inertia matrix (OSIM) that reduces the computational complexity to O(N). This algorithm, the inertia propagation method, is based on a single recursion that begins at the base of the manipulator and progresses out to the last link. Also applicable to redundant systems and mechanisms with multiple-degree-of-freedom joints, the inertia propagation method is the most efficient method known for computing {Lambda} for N {>=} 6. The numerical accuracy of the algorithm is discussed for a PUMA 560 robot with a fixed base.

Lilly, K.W. [Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical Engineering] [Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical Engineering; Orin, D.E. [Ohio State Univ., Columbus, OH (United States). Dept. of Electrical Engineering] [Ohio State Univ., Columbus, OH (United States). Dept. of Electrical Engineering

1993-09-01

36

The stochastic operator approach to random matrix theory

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

37

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

38

VML 3.0 Reactive Sequencing Objects and Matrix Math Operations for Attitude Profiling

NASA Technical Reports Server (NTRS)

VML (Virtual Machine Language) has been used as the sequencing flight software on over a dozen JPL deep-space missions, most recently flying on GRAIL and JUNO. In conjunction with the NASA SBIR entitled "Reactive Rendezvous and Docking Sequencer", VML version 3.0 has been enhanced to include object-oriented element organization, built-in queuing operations, and sophisticated matrix / vector operations. These improvements allow VML scripts to easily perform much of the work that formerly would have required a great deal of expensive flight software development to realize. Autonomous turning and tracking makes considerable use of new VML features. Profiles generated by flight software are managed using object-oriented VML data constructs executed in discrete time by the VML flight software. VML vector and matrix operations provide the ability to calculate and supply quaternions to the attitude controller flight software which produces torque requests. Using VML-based attitude planning components eliminates flight software development effort, and reduces corresponding costs. In addition, the direct management of the quaternions allows turning and tracking to be tied in with sophisticated high-level VML state machines. These state machines provide autonomous management of spacecraft operations during critical tasks like a hypothetic Mars sample return rendezvous and docking. State machines created for autonomous science observations can also use this sort of attitude planning system, allowing heightened autonomy levels to reduce operations costs. VML state machines cannot be considered merely sequences - they are reactive logic constructs capable of autonomous decision making within a well-defined domain. The state machine approach enabled by VML 3.0 is progressing toward flight capability with a wide array of applicable mission activities.

Grasso, Christopher A.; Riedel, Joseph E.

2012-01-01

39

Matrix Models and Marginal Operators in the Planar Limit

NASA Astrophysics Data System (ADS)

The role of monomials which are power of traces of matrices in matrix models with polynomial interaction potential is examined. Because of well-known factorization properties, the density of eigenvalues is trivially obtained in the planar limit by the saddle point method. Different susceptibilities have positive or negative critical coefficients.

Cicuta, Giovanni M.; Montaldi, Emilio

40

Properties and applications of transversal operators

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

41

A novel tactile sensor using a matrix of LEDs operating in both photoemitter and photodetector modes

We present a novel tactile sensor based on a matrix of light emitting diodes (LEDs). Unlike previous optical-based tactile sensors this approach relies on only one matrix of elements to perform the roles of both light source and light detector. This is possible by exploiting the little-known property of LEDs to act as photodetectors when operated in the photovoltaic or

Jonathan Rossiter; Toshiharu Mukai

2005-01-01

42

Evaluating Two-Loop massive Operator Matrix Elements with Mellin-Barnes Integrals

We calculate massive 5-propagator 2-loop integrals for operator matrix elements in the light-cone expansion, using Mellin-Barnes techniques and representations through generalized hypergeometric functions.

I. Bierenbaum; J. Blümlein; S. Klein

2006-07-27

43

Mechanisms for performing a complex matrix multiplication operation are provided. A vector load operation is performed to load a first vector operand of the complex matrix multiplication operation to a first target vector register. The first vector operand comprises a real and imaginary part of a first complex vector value. A complex load and splat operation is performed to load a second complex vector value of a second vector operand and replicate the second complex vector value within a second target vector register. The second complex vector value has a real and imaginary part. A cross multiply add operation is performed on elements of the first target vector register and elements of the second target vector register to generate a partial product of the complex matrix multiplication operation. The partial product is accumulated with other partial products and a resulting accumulated partial product is stored in a result vector register.

Eichenberger, Alexandre E; Gschwind, Michael K; Gunnels, John A

2014-02-11

44

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

45

Matrix heat exchangers and their application in cryogenic systems

NASA Astrophysics Data System (ADS)

The necessity of high effectiveness in a small volume has led to the development of perforated plate matrix heat exchangers (MHE) for cryogenic applications. Although the basic principles have remained the same, the techniques of fabrication and bonding have changed considerably during the last four decades. With the introduction of all metal construction, these exchangers are finding increasing use in cryogenic refrigerators. The mechanism of heat transfer in a matrix heat exchanger is complex. Convection in three different surfaces and conduction in two different directions are coupled together in determining the temperature profiles. While early analyses were based on simple empirical correlations and approximate analytical solutions, they have given way to accurate numerical models. This paper traces the chronological development of the MHE and different methods of fabrication, heat transfer and fluid flow characteristics and design and simulation procedures.

Venkatarathnam, G.; Sarangi, Sunil

46

WATER DISTRIBUTION SYSTEM OPERATION: APPLICATION OF

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.

47

Advanced mutation operators applicable in C# programs

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

48

Boundary operators in the O(n) and RSOS matrix models

NASA Astrophysics Data System (ADS)

We study the new boundary condition of the O(n) model proposed by Jacobsen and Saleur using the matrix model. The spectrum of boundary operators and their conformal weights are obtained by solving the loop equations. Using the diagrammatic expansion of the matrix model as well as the loop equations, we make an explicit correspondence between the new boundary condition of the O(n) model and the ``alternating height'' boundary conditions in RSOS model.

Bourgine, Jean-Emile; Hosomichi, Kazuo

2009-01-01

49

The Golden-Thompson inequality: Historical aspects and random matrix applications

The Golden-Thompson inequality, Tr?(e{sup A+B}) ? Tr?(e{sup A}e{sup B}) for A, B Hermitian matrices, appeared in independent works by Golden and Thompson published in 1965. Both of these were motivated by considerations in statistical mechanics. In recent years the Golden-Thompson inequality has found applications to random matrix theory. In this article, we detail some historical aspects relating to Thompson's work, giving in particular a hitherto unpublished proof due to Dyson, and correspondence with Pólya. We show too how the 2 × 2 case relates to hyperbolic geometry, and how the original inequality holds true with the trace operation replaced by any unitarily invariant norm. In relation to the random matrix applications, we review its use in the derivation of concentration type lemmas for sums of random matrices due to Ahlswede-Winter, and Oliveira, generalizing various classical results.

Forrester, Peter J., E-mail: p.forrester@ms.unimelb.edu.au; Thompson, Colin J. [Department of Mathematics and Statistics, The University of Melbourne, Victoria 3010 (Australia)] [Department of Mathematics and Statistics, The University of Melbourne, Victoria 3010 (Australia)

2014-02-15

50

Operator-based truncation scheme based on the many-body fermion density matrix

NASA Astrophysics Data System (ADS)

In an earlier work [S. A. Cheong and C. L. Henley, preceding paper], we derived an exact formula for the many-body density matrix ?B of a block of B sites cut out from an infinite chain of noninteracting spinless fermions, and found that the many-particle eigenvalues and eigenstates of ?B can all be constructed out of the one-particle eigenvalues and one-particle eigenstates, respectively. In this paper we improved upon this understanding, and developed a statistical-mechanical analogy between the density-matrix eigenstates and the many-body states of a system of noninteracting fermions. Each density-matrix eigenstate corresponds to a particular set of occupation of single-particle pseudoenergy levels, and the density-matrix eigenstate with the largest weight, having the structure of a Fermi sea ground state, unambiguously defines a pseudo-Fermi level. Based on this analogy, we outlined the main ideas behind an operator-based truncation of the density-matrix eigenstates, where single-particle pseudoenergy levels far away from the pseudo-Fermi level are removed as degrees of freedom. We report numerical evidence for scaling behaviors in the single-particle pseudoenergy spectrum for different block sizes B and different filling fractions n¯. With the aid of these scaling relations, which tell us that the block size B plays the role of an inverse temperature in the statistical-mechanical description of the density-matrix eigenstates and eigenvalues, we looked into the performance of our operator-based truncation scheme in minimizing the discarded density-matrix weight and the error in calculating the dispersion relation for elementary excitations. This performance was compared against that of the traditional density-matrix-based truncation scheme, as well as against an operator-based plane-wave truncation scheme, and found to be very satisfactory.

Cheong, Siew-Ann; Henley, Christopher L.

2004-02-01

51

Theorems on symmetries and flux conservation in radiative transfer using the matrix operator theory.

NASA Technical Reports Server (NTRS)

The matrix operator approach to radiative transfer is shown to be a very powerful technique in establishing symmetry relations for multiple scattering in inhomogeneous atmospheres. Symmetries are derived for the reflection and transmission operators using only the symmetry of the phase function. These results will mean large savings in computer time and storage for performing calculations for realistic planetary atmospheres using this method. The results have also been extended to establish a condition on the reflection matrix of a boundary in order to preserve reciprocity. Finally energy conservation is rigorously proven for conservative scattering in inhomogeneous atmospheres.

Kattawar, G. W.

1973-01-01

52

Computing the Frechet Derivative of the Matrix Exponential, with an application to Condition

Computing the FrÂ´echet Derivative of the Matrix Exponential, with an application to ConditionÂ1657 COMPUTING THE FRÂ´ECHET DERIVATIVE OF THE MATRIX EXPONENTIAL, WITH AN APPLICATION TO CONDITION NUMBER function having many applica- tions. The FrÂ´echet derivative of the matrix exponential describes the first

Higham, Nicholas J.

53

47 CFR 1.83 - Applications for radio operator licenses.

Code of Federal Regulations, 2010 CFR

...2010-10-01 false Applications for radio operator licenses. 1.83 Section...Proceedings § 1.83 Applications for radio operator licenses. (a) Application filing procedures for amateur radio operator licenses are set forth in...

2010-10-01

54

This work is devoted to a systematic investigation of triangular matrix forms of the Pascal Triangle. To start, the twelve matrix forms (collectively referred to as G-matrices) are presented. To highlight one way in which the G-matrices relate to each other, a set of four operators named circulant operators is introduced. These operators provide a new insight into the structure

BABIGA BIRREGAH; PROSPER K. DOH; KONDO H. ADJALLAH

2006-01-01

55

We present a general methodology for performing statistical inference on the components of a real-valued matrix parameter for which rows and columns are subject to order restrictions. The proposed estimation procedure is based on an iterative algorithm developed by Dykstra and Robertson (1982) for simple order restriction on rows and columns of a matrix. For any order restrictions on rows and columns of a matrix, sufficient conditions are derived for the algorithm to converge in a single application of row and column operations. The new algorithm is applicable to a broad collection of order restrictions. In practice, it is easy to design a study such that the sufficient conditions derived in this paper are satisfied. For instance, the sufficient conditions are satisfied in a balanced design. Using the estimation procedure developed in this article, a bootstrap test for order restrictions on rows and columns of a matrix is proposed. Computer simulations for ordinal data were performed to compare the proposed t...

Teoh, Eric; Wormser, Uri; Peddada, Shyamal D

2008-01-01

56

Calculation of Massive 2-Loop Operator Matrix Elements with Outer Gluon Lines

Massive on-shell operator matrix elements and self-energy diagrams with outer gluon lines are calculated analytically at $O(\\alpha_s^2)$, using Mellin-Barnes integrals and representations through generalized hypergeometric functions. This method allows for a direct evaluation without decomposing the integrals using the integration-by-parts method.

I. Bierenbaum; J. Blümlein; S. Klein

2007-02-26

57

The most general L operator for the R -matrix of the XXX model

The problem of describing all the monodromy matrices for R matrices of the XXX and XXZ models is discussed. It is shown that the L operator of the lattice nonlinear Schrödinger model generates all possible monodromy matrices for the XXX R matrix.

A. G. Izergin; V. E. Korepin

1984-01-01

58

Published in "Operator Theory: Advances and Applications",

of convergence of the corresponding hypersingular integrals. We also show that this range coincidesPublished in "Operator Theory: Advances and Applications", vol 181, 2008, 393-416 Characterization of the range of one-dimensional fractional integration in the space with variable exponent Humberto Rafeiro

Samko, Stefan

59

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

NASA Astrophysics Data System (ADS)

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 CO 2 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 CO 2 removal from atmospheric air. This project was an attempt to address these issues by using the cooling available from the vaporisation of liquid hydrogen and/or boil-off vapour, to remove CO 2 from the alkaline fuel cell feed air by refrigeration purification, ie. by freezing the CO 2 out of the air. A schematic description of the process and an energy balance for refrigeration purification for the CO 2 removal are presented, showing that the process relies on high effectiveness heat exchangers and water re-vaporisation. The high effectiveness heat transfer is achieved using perforated plate matrix heat exchangers. Implicit in this work were: The development of a new sizing procedure for matrix heat exchangers based on an approximate analytical solution for their performance, published recently in this journal. The development of a new method for construction of perforated plate matrix heat exchangers. Experimental testing of matrix heat exchanger performance. The application of matrix heat exchangers to mass transfer, and their use as reversing heat exchangers. Certain questions relating to the recent analysis published in this journal are raised and modifications suggested. Experimental results of heat exchanger effectiveness tests and CO 2 removal tests showed that heat exchangers of the requisite effectiveness were designed and manufactured, and that the proposed process was successful in exergy recovery and CO 2 removal

Ahuja, Vikas; Green, Roger

60

NASA Astrophysics Data System (ADS)

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

Trimpin, Sarah; Inutan, Ellen D.

2013-05-01

61

Application of the device of slices for automation of matrix calculations

NASA Astrophysics Data System (ADS)

The basic concepts of the device of slices for the processing of multidimensional numerical arrays are represented. The data on the developed matrix component supporting the concept of simple and generalized slices are given. The application efficiency of the slicing device and matrix components in industrial automation at the stages of matrix computation automation is shown.

Romanovsky, E. A.

2014-12-01

62

Theory and application of covariance matrix tapers for robust adaptive beamforming

We unify several seemingly disparate approaches to robust adaptive beamforming through the introduction of the concept of a “covariance matrix taper (CMT)”. This is accomplished by recognizing that an important class of adapted pattern modification techniques are realized by the application of a conformal matrix “taper” to the original sample covariance matrix. From the Schur product theorem for positive (semi)

Joseph R. Guerci

1999-01-01

63

64

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

NASA Astrophysics Data System (ADS)

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

Ye?ilkayagil, Medine; Ba?ar, Feyzi

2012-08-01

65

Off-diagonal matrix elements of local operators in many-body quantum systems

NASA Astrophysics Data System (ADS)

In the time evolution of isolated quantum systems out of equilibrium, local observables generally relax to a long-time asymptotic value, governed by the expectation values (diagonal matrix elements) of the corresponding operator in the eigenstates of the system. The temporal fluctuations around this value, response to further perturbations, and the relaxation toward this asymptotic value are all determined by the off-diagonal matrix elements. Motivated by this nonequilibrium role, we present generic statistical properties of off-diagonal matrix elements of local observables in two families of interacting many-body systems with local interactions. Since integrability (or lack thereof) is an important ingredient in the relaxation process, we analyze models that can be continuously tuned to integrability. We show that, for generic nonintegrable systems, the distribution of off-diagonal matrix elements is a Gaussian centered at zero. As one approaches integrability, the peak around zero becomes sharper, so the distribution is approximately a combination of two Gaussians. We characterize the proximity to integrability through the deviation of this distribution from a Gaussian shape. We also determine the scaling dependence on system size of the average magnitude of off-diagonal matrix elements.

Beugeling, Wouter; Moessner, Roderich; Haque, Masudul

2015-01-01

66

Matrix-product operators and states: NP-hardness and undecidability.

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

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

Operational Experience with the Scattering Matrix Arc Detection System on the JET ITER-Like Antenna

The Scattering Matrix Arc Detection System (SMAD) has been fully deployed on all 4 sets of Resonant Double Loop (RDL), Vacuum Transmission Line (VTL) and Antenna Pressurised Transmission Lines (APTL) of the JET ICRF ITER-Like Antenna (ILA) and this has been indispensable for operating at low (real) T-point impedance values to investigate ELM tolerance. This paper describes the necessity of the SMAD vs VSWR (Voltage Standing Wave Ratio) protection system, SMAD commissioning, problems and a number of typical events detected by the SMAD system during operation on plasma.

Vrancken, M.; Lerche, E.; Dumortier, P.; Durodie, F.; Evrard, M.; Huygen, S.; Ongena, J.; Van Eester, D.; Van Schoor, M.; Vervier, M.; Weynants, R. [LPP/ERM-KMS, Association EURATOM-Belgian State, Brussels (Belgium); Blackman, T.; Graham, M.; Jacquet, P.; Kaye, A.; Mayoral, M.-L.; Nightingale, M. P. S. [EURATOM/UKAEA Fusion Association, Culham Science Center (United Kingdom); Goulding, R. H. [Oak Ridge National Laboratory, Oak Ridge (United States)

2009-11-26

69

Fission matrix capability for MCNP, Part II - Applications

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

70

NASA Astrophysics Data System (ADS)

Application of geophysical methods to collect evidence of possible conduct of an underground nuclear explosion is an essential element of the on-site inspection (OSI) verification component of the Comprehensive Nuclear Test Ban Treaty (CTBT). As with any geophysical survey, effective use of resources during an OSI is essential. The evaluation matrix approach can be applied to both assess in a comprehensive manner the suitability of OSI techniques with respect to an ensemble of different conditions based on a specific OSI scenario (Technology Evaluation Matrix, TEM) and to estimate the technical readiness status of a specific technology (Technical Readiness Status Matrix, TRSM). Applied to the work of the OSI Division of the Provisional Secretariat of the Comprehensive Nuclear-Test Ban Treaty Organization (CTBTO), the TRSM will support policy planning and operational projects that need to be thoroughly analyzed, providing a flexible mechanism that allows for fast and rationale decision making for resource allocation; on the other hand, the TEM will improve the functionality of an OSI by providing the inspection team a reference tool for a particular OSI scenario (e.g., yield and depth of the triggering event, geology of the inspection area, possible emplacement conditions). This assessment is important because of the limited time and number of team members provided to the inspection team for the conduct of an inspection. In this work we discuss the application of the TEM concept to the set of geophysical techniques that can be applied during an OSI for two basic underground nuclear explosion (UNE) scenarios: explosions conducted in a vertical emplacement (i.e. borehole) and explosions conducted in a horizontal emplacement (i.e. tunnel). After introducing the natural and manmade signatures usually associated with an UNE and the geophysical techniques allowed by the Treaty (with imposed constraints), examples of evaluation matrices are given for each scenario. The first matrix presented evaluates the technologies according to their relevance during an OSI using the different UNE observables as defined in the scenario. A second matrix estimates the limitations and confidence of each technique for the detection of UNE signatures. The third TEM considers the operational aspects of each technique, such as resources needed (in terms of personnel and time), simplicity of deployment, logistical factors, ruggedness, etc. Finally, the impact of this TEM concept on the search logic of an on-site inspection is discussed.

Gaya-Piqué, Luis R.; Stefanova, Stefka; Hawkins, Ward L.; Sweeney, Jerry J.; Melamud, Mordechai; Prah, Matjaz

2010-05-01

71

Low nonconvex rank bilinear matrix inequalities: algorithms and applications

A branch and bound (BB) algorithm for solving a general class of bilinear matrix inequality (BMI) problem is proposed. First, linear matrix inequality (LMI) constraints are incorporated into BMI constraints in a special way to take advantage of useful informations on nonconvex terms. Then, the nonconvexity of BMI is centralized in coupling constraints so that when the latter are omitted,

H. D. Tuan; P. Apkarian

1999-01-01

72

Models of new physics induce K-Kbar mixing operators having Dirac structures other than the "left-left" form of the Standard Model. We calculate the functional form of the corresponding B-parameters at next-to-leading order in both SU(3) and SU(2) staggered chiral perturbation theory (SChPT). Numerical results for these matrix elements are being generated using improved staggered fermions; our results can be used to extrapolate these matrix elements to the physical light and strange quark masses. The SU(3) SChPT results turn out to be much simpler than that for the Standard Model B_K operator, due to the absence of chiral suppression in the new operators. The SU(2) SChPT result is of similar simplicity to that for B_K. In fact, in the latter case, the chiral logarithms for two of the new B-parameters are identical to those for B_K, while those for the other two new B-parameters are of opposite sign. In addition to providing results for the 2+1 flavor theory in SU(3) SChPT and the 1+1+1 flavor theory in SU(2) SChPT, we present the corresponding continuum partially quenched results, as these are not available in the literature.

Jon A. Bailey; Hyung-Jin Kim; Weonjong Lee; Stephen R. Sharpe

2012-02-08

73

Matrix elements of spin operators in exchange coupled tetrameric metal clusters

NASA Astrophysics Data System (ADS)

An analytical evaluation of matrix elements of single spin operators in tetranuclear mixed-valence metal clusters is presented. The case of a ground state of the cluster with one strongly anti-ferromagnetic coupled spin pair and the second pair with undefined spin state is considered in detail. Such spin states have been discussed as a model for the water-oxidizing complex in photosystem II. Consequences of the structure of the ground state apparent in the hyperfine structure observed by EPR are discussed. The spin coupling algebra is presented and evaluated using the Mathematica software system.

Bittl, Robert

1993-12-01

74

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

75

Gram matrix of a Laguerre model: application to model reduction of irrational transfer function

1 Gram matrix of a Laguerre model: application to model reduction of irrational transfer function N The Gram matrix of a system is very useful in system identification, power density spectrum modeling and model reduction. The Gram ma- trix contains elements that are inner products of repeated integrals and

Paris-Sud XI, UniversitÃ© de

76

Applications of the Transmission Line Matrix Method to Microwave Scanning Razvan Ciocan

that microwave propagation is affected by a large number of material properties: composition, structure, moistureApplications of the Transmission Line Matrix Method to Microwave Scanning Microscopy Razvan Ciocan-line matrix (TLM) model was developed to simulate microwave-scanning microscopy. A TLM algorithm that allows

Ida, Nathan

77

Glueball matrix elements: a lattice calculation and applications

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

78

Registration scheme suitable to Mueller matrix imaging for biomedical applications

Most Mueller matrix imaging polarimeters implement sequential acquisition of at least 16 raw images of the same object with different incident and detected light polarizations. When this technique is implemented in vivo, the unavoidable motions of the subject may shift and distort the raw images to an extent such that the final Mueller images cannot be extracted. We describe a

Steve Guyot; Makrina Anastasiadou; Eric Deléchelle; Antonello de Martino

2007-01-01

79

Calculating massive 3-loop graphs for operator matrix elements by the method of hyperlogarithms

NASA Astrophysics Data System (ADS)

We calculate convergent 3-loop Feynman diagrams containing a single massive loop equipped with twist ?=2 local operator insertions corresponding to spin N. They contribute to the massive operator matrix elements in QCD describing the massive Wilson coefficients for deep-inelastic scattering at large virtualities. Diagrams of this kind can be computed using an extended version of the method of hyperlogarithms, originally being designed for massless Feynman diagrams without operators. The method is applied to Benz- and V-type graphs, belonging to the genuine 3-loop topologies. In case of the V-type graphs with five massive propagators, new types of nested sums and iterated integrals emerge. The sums are given in terms of finite binomially and inverse binomially weighted generalized cyclotomic sums, while the 1-dimensionally iterated integrals are based on a set of ?30 square-root valued letters. We also derive the asymptotic representations of the nested sums and present the solution for N?C. Integrals with a power-like divergence in N-space ?aN,a?R,a>1, for large values of N emerge. They still possess a representation in x-space, which is given in terms of root-valued iterated integrals in the present case. The method of hyperlogarithms is also used to calculate higher moments for crossed box graphs with different operator insertions.

Ablinger, Jakob; Blümlein, Johannes; Raab, Clemens; Schneider, Carsten; Wißbrock, Fabian

2014-08-01

80

Calculating Massive 3-loop Graphs for Operator Matrix Elements by the Method of Hyperlogarithms

We calculate convergent 3-loop Feynman diagrams containing a single massive loop equipped with twist $\\tau =2$ local operator insertions corresponding to spin $N$. They contribute to the massive operator matrix elements in QCD describing the massive Wilson coefficients for deep-inelastic scattering at large virtualities. Diagrams of this kind can be computed using an extended version to the method of hyperlogarithms, originally being designed for massless Feynman diagrams without operators. The method is applied to Benz- and $V$-type graphs, belonging to the genuine 3-loop topologies. In case of the $V$-type graphs with five massive propagators new types of nested sums and iterated integrals emerge. The sums are given in terms of finite binomially and inverse binomially weighted generalized cyclotomic sums, while the 1-dimensionally iterated integrals are based on a set of $\\sim 30$ square-root valued letters. We also derive the asymptotic representations of the nested sums and present the solution for $N \\in \\mathbb{C}$. Integrals with a power-like divergence in $N$--space $\\propto a^N, a \\in \\mathbb{R}, a > 1,$ for large values of $N$ emerge. They still possess a representation in $x$--space, which is given in terms of root-valued iterated integrals in the present case. The method of hyperlogarithms is also used to calculate higher moments for crossed box graphs with different operator insertions.

Jakob Ablinger; Johannes Blümlein; Clemens Raab; Carsten Schneider; Fabian Wißbrock

2014-03-05

81

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

82

Evaluating wilderness recreational opportunities: Application of an impact matrix

NASA Astrophysics Data System (ADS)

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

Stohlgren, Thomas J.; Parsons, David J.

1992-05-01

83

Evaluating wilderness recreational opportunities: application of an impact matrix

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

84

Coherency matrix polarization measurements: application to magnetooptic garnet films.

A method of completely determining the polarization of light is described. An algorithm that allows a fast numerical evaluation of the coherency matrix based on the results of four nonequivalent polarization measurements is presented. The method has been applied to determine the degree of polarization, ellipticity, and orientation of the major axis of light transmitted through a magnetooptic thin film on a garnet substrate as a function of magnetic field. Representative results are given. PMID:20700350

Engstrom, H

1991-05-01

85

Curcumin: a multipurpose matrix for MALDI mass spectrometry imaging applications.

Curcumin, 1,7-bis-(4-hydroxy-3-methoxy-phenyl)-hepta-1,6-diene-3,5-dione, is a polyphenolic compound naturally present in the Curcuma longa plant, also known as tumeric. Used primarily as a coloring agent and additive in food, curcumin has also long been used for its therapeutic properties in a number of medical scenarios. Here, we report on an entirely novel use of curcumin; its extended structure of conjugated double bonds suggested the potential of this compound to be a good matrix assisted laser desorption ionization mass spectrometry (MALDI MS) matrix candidate. In the quest for novel and more efficient MALDI MS matrices, curcumin is revealed to be a versatile and multipurpose matrix. It has been applied successfully for the analysis of pharmaceuticals and drugs, for imaging lipids in skin and lung tissues, and for the analysis of a number of compound classes in fingermarks. In each case, the use of curcumin is shown to promote analyte ionization very efficiently as well as provide excellent mass spectral image quality. PMID:23621442

Francese, S; Bradshaw, R; Flinders, B; Mitchell, C; Bleay, S; Cicero, L; Clench, M R

2013-05-21

86

Certificate in Cyber Operations Pre-Application Form

Certificate in Cyber Operations Pre-Application Form Please complete the entire pre-application form to be considered for acceptance into the Certificate in Cyber Operations Program. Fields-692-6600 or e-mail cyber@umbctraining.com. Pre-Application Form Submission E-mail completed form to cyber

Maryland, Baltimore County, University of

87

High-dimensional Sparse Precision Matrix Estimation via Sparse Column Inverse Operator

This paper proposes a new method for estimating sparse precision matrices in the high dimensional setting. This procedure applies a novel Sparse Column-wise Inverse Operator (SCIO) to modified sample covariance matrices. We establish the convergence rates of this procedure under various matrix norms. Under the Frobenius norm loss, we prove theoretical guarantees on using cross validation to pick data-driven tunning parameters. Another important advantage of this estimator is its efficient computation for large-scale problems, using a path-following coordinate descent algorithm we provide. Numerical merits of our estimator are also illustrated using simulated and real datasets. In particular, this method is found to perform favorably on analyzing an HIV brain tissue dataset and an ADHD resting fMRI dataset.

Liu, Weidong

2012-01-01

88

Dual closure operators and their applications D. Dikranjan

Dual closure operators and their applications D. Dikranjan and W. Tholen Abstract Departing from a suitable categorical description of closure operators, this paper dualizes this notion and introduces some basic properties of dual closure operators. Usually these operators act on quotients rather than

Tholen, Walter

89

q-Differential operator identities and applications

NASA Astrophysics Data System (ADS)

In this paper, we construct a new q-exponential operator and obtain some operator identities. Using these operator identities, we give a formal extension of Jackson's transformation formula. A formal extension of Bailey's summation and an extension of the Sears terminating balanced transformation formula are also derived by our operator method. In addition, we also derive several interesting a formal extensions involving multiple sum about three terms of Sears transformation formula and Heine's transformation formula.

Fang, Jian-Ping

2007-08-01

90

Registration scheme suitable to Mueller matrix imaging for biomedical applications

NASA Astrophysics Data System (ADS)

Most Mueller matrix imaging polarimeters implement sequential acquisition of at least 16 raw images of the same object with different incident and detected light polarizations. When this technique is implemented in vivo, the unavoidable motions of the subject may shift and distort the raw images to an extent such that the final Mueller images cannot be extracted. We describe a registration algorithm which solves this problem for the typical conditions of in vivo imaging, e.g. with spatially inhomogeneous medium to strong depolarization. The algorithm, based on the so called “optical flow,” is validated experimentally by comparing the Mueller images of a pig skin sample taken in static and in dynamic conditions.

Guyot, Steve; Anastasiadou, Makrina; Deléchelle, Eric; de Martino, Antonello

2007-06-01

91

3-loop Massive $O(T_F^2)$ Contributions to the DIS Operator Matrix Element $A_{gg}$

Contributions to heavy flavour transition matrix elements in the variable flavour number scheme are considered at 3-loop order. In particular a calculation of the diagrams with two equal masses that contribute to the massive operator matrix element $A_{gg,Q}^{(3)}$ is performed. In the Mellin space result one finds finite nested binomial sums. In $x$-space these sums correspond to iterated integrals over an alphabet containing also square-root valued letters.

J. Ablinger; J. Blümlein; A. De Freitas; A. Hasselhuhn; A. von Manteuffel; M. Round; C. Schneider

2014-09-04

92

are also finding an increasing number of applications in the context of information theory and signal of random matrices to various problems in the information theory of noisy communication channelsAn Application of Random Matrix Theory: Asymptotic Capacity of Ergodic and Non-ergodic Multiantenna

VerdÃº, Sergio

93

In this paper we introduce a general parallelizable computational method for solving a wide spectrum of constrained matrix problems. The constrained matrix problem is a core problem in numerous applications in economics. ...

Nagurney, Anna

94

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

NASA Astrophysics Data System (ADS)

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

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

2011-02-01

95

Reweighted low-rank matrix recovery and its application in image restoration.

In this paper, we propose a reweighted low-rank matrix recovery method and demonstrate its application for robust image restoration. In the literature, principal component pursuit solves low-rank matrix recovery problem via a convex program of mixed nuclear norm and l1 norm. Inspired by reweighted l1 minimization for sparsity enhancement, we propose reweighting singular values to enhance low rank of a matrix. An efficient iterative reweighting scheme is proposed for enhancing low rank and sparsity simultaneously and the performance of low-rank matrix recovery is prompted greatly. We demonstrate the utility of the proposed method both on numerical simulations and real images/videos restoration, including single image restoration, hyperspectral image restoration, and background modeling from corrupted observations. All of these experiments give empirical evidence on significant improvements of the proposed algorithm over previous work on low-rank matrix recovery. PMID:25415947

Peng, Yigang; Suo, Jinli; Dai, Qionghai; Xu, Wenli

2014-12-01

96

Sublimation as a method of matrix application for mass spectrometric imaging.

Common organic matrix-assisted laser desorption/ionization (MALDI) matrices, 2,5-dihydroxybenzoic acid, 3,5-dimethoxy-4-hydroxycinnamic acid, and alpha-cyano-4-hydroxycinnamic acid, were found to undergo sublimation without decomposition under conditions of reduced pressure and elevated temperature. This solid to vapor-phase transition was exploited to apply MALDI matrix onto tissue samples over a broad surface in a solvent-free application for mass spectrometric imaging. Sublimation of matrix produced an even layer of small crystals across the sample plate. The deposition was readily controlled with time, temperature, and pressure settings and was highly reproducible from one sample to the next. Mass spectrometric images acquired from phospholipid standards robotically spotted onto a MALDI plate yielded a more intense, even signal with fewer sodium adducts when matrix was applied by sublimation relative to samples where matrix was deposited by an electrospray technique. MALDI matrix could be readily applied to tissue sections on glass slides and stainless steel MALDI plate inserts as long as good thermal contact was made with the condenser of the sublimation device. Sections of mouse brain were coated with matrix applied by sublimation and were imaged using a Q-q-TOF mass spectrometer to yield mass spectral images of very high quality. Image quality is likely enhanced by several features of this technique including the microcrystalline morphology of the deposited matrix, increased purity of deposited matrix, and evenness of deposition. This inexpensive method was reproducible and eliminated the potential for spreading of analytes arising from solvent deposition during matrix application. PMID:17659880

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

2007-09-01

97

Magnet operating experience review for fusion applications

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

Cadwallader, L.C.

1991-11-01

98

Application of the residue number system to the matrix multiplication problem

APPLICATION OF THE RESIDUE NUMBER SYSTEM TO THE MATRIX MULTIPLICATION PROBLEM A Thesis by GARY FRANKLIN CHARD Submitted to Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER... 1989) Gary Franklin Chard, B. S. , Texas A&M University Chairman of Advisory Committee: Dr. Yu-Ying Jackson Leung I'he primary objective of this research is to evaluate a residue implementation of the matrix multiplication algorithm by comparison...

Chard, Gary Franklin

1989-01-01

99

Transmutations for Darboux transformed operators with applications

We solve the following problem. Given a continuous complex-valued potential q_1 defined on a segment [-a,a] and let q_2 be the potential of a Darboux transformed Schr\\"odinger operator. Suppose a transmutation operator T_1 for the potential q_1 is known such that the corresponding Schr\\"odinger operator is transmuted into the operator of second derivative. Find an analogous transmutation operator T_2 for the potential q_2. It is well known that the transmutation operators can be realized in the form of Volterra integral operators with continuously differentiable kernels. Given a kernel K_1 of the transmutation operator T_1 we find the kernel K_2 of T_2 in a closed form in terms of K_1. As a corollary interesting commutation relations between T_1 and T_2 are obtained which then are used in order to construct the transmutation operator for the one-dimensional Dirac system with a scalar potential.

Vladislav V. Kravchenko; Sergii M. Torba

2011-11-18

100

Neutronic aspects of inert matrix fuels for application in ADS

NASA Astrophysics Data System (ADS)

Accelerator driven systems may operate on uranium or thorium free fuels. In order to guarantee the stability of such fuels at high temperatures, the use of inert matrices is foreseen. In the present study, safety parameters of 800 MWth ADS cores operating on oxide and nitride fuels with high americium content are investigated for a representative range of pin and core geometries. It is shown that among the inert matrices investigated, chromium yields the lowest void worth, hafnium nitride the highest fission probability for americium and magnesia the highest burnup potential.

Wallenius, J.

2003-07-01

101

Reduced density matrix hybrid approach: Application to electronic energy transfer

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

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

2012-02-28

102

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

103

Real-World Applications Learning Composite Operators for Object Detection

Real-World Applications Learning Composite Operators for Object Detection Bir Bhanu and Yingqiang Lin Center for Research in Intelligent Systems University of California, Riverside, CA, 92521, USA composite operators and features that are evolved from combinations of primitive image processing operations

Fernandez, Thomas

104

Operational Applications of Satellite Snowcover Observations

NASA Technical Reports Server (NTRS)

The history of remote sensing of snow cover is reviewed and the following topics are covered: various techniques for interpreting LANDSAT and NOAA satellite data; the status of future systems for continuing snow hydrology applications; the use of snow cover observations in streamflow forecasts by Applications Systems Verification and Transfer participants and selected foreign investigators; and the benefits of using satellite snow cover data in runoff prediction.

Rango, A. (editor); Peterson, R. (editor)

1980-01-01

105

Robust Joining and Assembly of Ceramic Matrix Composites for High Temperature Applications

NASA Technical Reports Server (NTRS)

Advanced ceramic matrix composites (CMCs) are under active consideration for use in a wide variety of high temperature applications within the aerospace, energy, and nuclear industries. The engineering designs of CMC components require fabrication and manufacturing of large and complex shaped parts of various thicknesses. In many instances, it is more economical to build up complex shapes by joining simple geometrical shapes. Thus, joining and attachment have been recognized as enabling technologies for successful utilization of ceramic components in various demanding applications. In this presentation, various challenges and opportunities in design, fabrication, and testing of high temperature joints in ceramic matrix composites will be presented. A wide variety of ceramic composites, in different shapes and sizes, have been joined using an affordable, robust ceramic joining technology (ARCJoinT). Microstructure and mechanical properties of joints in melt infiltrated and CVI Sic matrix composites will be reported. Various joint design philosophies and design issues in joining of composites will be discussed.

Singh, Mrityunjay

2003-01-01

106

RFID: Applications, Operation, Numbering and Lookups

: smart self, smart shopping cart, inventory tracking Â· Large scale trials (Metro Supermarket, Germany to effects of radiation on drugs RFID Basics Â· AC oscillation at the end-points of an antenna creates/applications after possible additional processing step #12;4 Tag components Â· Antenna (different types according

Roussos, George

107

RFID: Applications, Operation, Numbering and Lookups

) Â Identification Â· Highly hackable (more on this at the end) #12;Retail Â· Consumer applications: smart self, smart of radiation on drugs #12;RFID Basics Â· AC oscillation at the end-points of an antenna creates magnetic possible additional processing step #12;Tag components Â· Antenna (different types according to coupling

Roussos, George

108

Ceramic matrix composite applications in advanced liquid fuel rocket engine turbomachinery

NASA Technical Reports Server (NTRS)

Fiber-reinforced ceramic matrix composites have been identified with properties suitable for near term applications. Conceptual design studies indicate the feasibility of applying C/SiC, and subelements were manufactured that verify selected fabrication features and key material properties. Tests and inspection of these subelements confirmed their capabilities.

Brockmeyer, Jerry W.

1992-01-01

109

Applications and comparisons of methods of computing the S Matrix of 2-ports

We report on the application of three different methods of computing the S Matrix for 2-port microwave circuits. The four methods are modal expansions with field matching across boundaries, time domain integration of Maxwell`s equations as implemented in MAFIA, HFSS (high frequency structure simulator), and the KKY frequency domain method. Among the applications to be described are steps in rectangular waveguides and irises in waveguides.

Jones, R.M.; Ko, Kwok; Tantawi, S. [Stanford Linear Accelerator Center, Menlo Park, CA (United States); Kroll, N. [Stanford Linear Accelerator Center, Menlo Park, CA (United States)]|[California Univ., San Diego, La Jolla, CA (United States); Yu, D. [Duly Research, Inc., Rancho Palos Verdes, CA (United States)

1993-05-01

110

A workshop to assess the potential application of ceramic matrix composites (CMCs) for structural applications in fusion reactors was held on May 21--22, 1990, at University of California, Santa Barbara. Participants included individuals familiar with materials and design requirements in fusion reactors, ceramic composite processing and properties and radiation effects. The primary focus was to list the feasibility issues that might limit the application of these materials in fusion reactors. Clear advantages for the use of CMCs are high-temperature operation, which would allow a high-efficiency Rankine cycle, and low activation. Limitations to their use are material costs, fabrication complexity and costs, lack of familiarity with these materials in design, and the lack of data on radiation stability at relevant temperatures and fluences. Fusion-relevant feasibility issues identified at this workshop include: hermetic and vacuum properties related to effects of matrix porosity and matrix microcracking; chemical compatibility with coolant, tritium, and breeder and multiplier materials, radiation effects on compatibility; radiation stability and integrity; and ability to join CMCs in the shop and at the reactor site, radiation stability and integrity of joints. A summary of ongoing CMC radiation programs is also given. It was suggested that a true feasibility assessment of CMCs for fusion structural applications could not be completed without evaluation of a material tailored'' to fusion conditions or at least to radiation stability. It was suggested that a follow-up workshop be held to design a tailored composite after the results of CMC radiation studies are available and the critical feasibility issues are addressed.

Jones, R.H. (Pacific Northwest Lab., Richland, WA (USA)); Lucas, G.E. (California Univ., Santa Barbara, CA (USA))

1990-11-01

111

Background Little has been done to investigate the application of injury specific qualitative research methods in the field of burn injuries. The aim of this study was to use an analytical tool (Haddon’s matrix) through qualitative research methods to better understand people’s perceptions about burn injuries. Methods This study applied Haddon’s matrix as a framework and an analytical tool for a qualitative research methodology in burn research. Both child and adult burn injury victims were enrolled into a qualitative study conducted using focus group discussion. Haddon’s matrix was used to develop an interview guide and also through the analysis phase. Results The main analysis clusters were pre-event level/human (including risky behaviors, belief and cultural factors, and knowledge and education), pre-event level/object, pre-event phase/environment and event and post-event phase (including fire control, emergency scald and burn wound management, traditional remedies, medical consultation, and severity indicators). This research gave rise to results that are possibly useful both for future injury research and for designing burn injury prevention plans. Conclusion Haddon’s matrix is applicable in a qualitative research methodology both at data collection and data analysis phases. The study using Haddon’s matrix through a qualitative research methodology yielded substantially rich information regarding burn injuries that may possibly be useful for prevention or future quantitative research. PMID:22866013

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

2012-01-01

112

36 CFR 1194.21 - Software applications and operating systems.

Code of Federal Regulations, 2011 CFR

...disrupt or disable activated features of any operating system that are identified as accessibility features where the application programming...interface for those accessibility features has been documented by the...selected contrast and color selections and other individual...

2011-07-01

113

Hypermedia and intelligent tutoring applications in a mission operations environment

NASA Technical Reports Server (NTRS)

Hypermedia, hypertext and Intelligent Tutoring System (ITS) applications to support all phases of mission operations are investigated. The application of hypermedia and ITS technology to improve system performance and safety in supervisory control is described - with an emphasis on modeling operator's intentions in the form of goals, plans, tasks, and actions. Review of hypermedia and ITS technology is presented as may be applied to the tutoring of command and control languages. Hypertext based ITS is developed to train flight operation teams and System Test and Operation Language (STOL). Specific hypermedia and ITS application areas are highlighted, including: computer aided instruction of flight operation teams (STOL ITS) and control center software development tools (CHIMES and STOL Certification Tool).

Ames, Troy; Baker, Clifford

1990-01-01

114

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

115

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

116

Draft standard for color active matrix liquid crystal displays (AMLCD) for military applications

NASA Astrophysics Data System (ADS)

With the advancements made in flat panel display technology and the insertion of these displays within military and civil application, there is a need to establish standardization of active matrix liquid crystal displays (AMLCDS) while this process is in it's infancy. Currently, there are no accepted civil or military standards covering AMLCDS. Since the proliferation of this technology has found a place within DOD applications, a best practices document in the form of a standard was created in 1993. This paper covers the changes made in the third evolution of the 'Draft Standard for Color Active Matrix Liquid Crystal Displays (AMLCDS) for US Military Aircraft, Recommended Best Practices'. This document is published by the Air Force through Wright Laboratory as WL-TR-93-1177 in Jun 94. This paper covers the background and future plans for the document as well as four key revisions: Applicability documents review, Display configurations, Testing and Test standards, and Electrical interfaces.

Revels, Allen R.; Hopper, Darrel G.; Meyer, Frederick M.

1995-06-01

117

Applications of Empirical Science in Manufacturing and Service Operations

This paper sets the stage for the special issue on the application of empirical science in operations management (OM). It highlights the contributions that empirical science can make to operations management research and practice. In particular, the role of theory building and testing as a motivation for OM empirical research is emphasized. The paper provides a brief history of the

Aleda V. Roth

2007-01-01

118

Matrix Representation of Bounded Linear Operators By Bessel Sequences, Frames and

Peter Balazs Acoustics Research Institute, Austrian Academy of Sciences, Wohllebengasse 12-14, 1040 Wien, Austria. peter.balazs@oeaw.ac.at Abstract: In this work we will investigate how to find a matrix rep

Boyer, Edmond

119

Operator Theory: Advances and Applications, Vol. 193, 281301

spaces, taking into account the degeneracy of the order (x). 20 . Hypersingular integrals. In the caseOperator Theory: Advances and Applications, Vol. 193, 281Â301 c 2009 BirkhÂ¨auser Verlag Basel and Applications on the occasion of the 70th birthday of Vladimir Maz'ya, Rome, June 30ÂJuly 3, 2008. We touch both

Samko, Stefan

120

Ergonomics Applications of a Mechanical Model of the Human Operator in Power Hand Tool Operation

Applications of a new model for predicting power threaded-fastener-driving tool operator response and capacity to react against impulsive torque reaction forces are explored for use in tool selection and ergonomic workplace design. The model is based on a mechanical analog of the human operator, with parameters dependent on work location (horizontal and vertical distances); work orientation (horizontal and vertical); and

Jia-Hua Lin; Robert G. Radwin; David A. Nembhard

2005-01-01

121

Application of the arbitrary decomposition to finite spot size Mueller matrix measurements.

Finite spot size Mueller matrix polarimetric measurements whereby the light spot impinges on two different areas of the sample, e.g., a grating and a substrate, are relatively frequently met in practice. It has been shown that if the Mueller matrix of one of the areas (the substrate) is known from an additional measurement then the Mueller matrix of the remaining medium (the grating) can be obtained from the (substrate-grating) overall response by the polarimetric subtraction method. We show that, provided a specific condition is fulfilled, the individual polarimetric responses of the two areas can be retrieved from the finite spot size measurement by using a special form of the arbitrary decomposition even if none of the individual responses is known a priori. The decomposition method is illustrated on a microelectronics grating structure and its accuracy, as well as limits of applicability, is discussed. PMID:25321684

Ossikovski, Razvigor; Garcia-Caurel, Enric; Foldyna, Martin; Gil, José J

2014-09-10

122

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.

123

Application of AI technology to nuclear plant operations

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

124

Matrix induced in-situ growth of crystalline Au nanoparticles for photonic applications

NASA Astrophysics Data System (ADS)

The authors present a novel in-situ method of fabricating crystalline gold nanoparticles by self-organization. This nanoparticles are grown and modified in a surrounding thin film matrix using two different host materials (YBa2Cu3O7-? and SrTiO3) prepared by a pulsed laser deposition technique. The crystalline Au nanoparticles are formed out of a gold seed layer whereby the thickness of the initial seed layer influences the particle size and their distribution density. As we will show, using a matrix based preparation technique offers several advantages over conventional preparation methods. On the one hand, nanoparticle size and the distribution density can be controlled individually. On the other hand, by choosing an appropriate matrix material as well as suitable growth conditions also the shape of the resulting particles can be modified. Thus, also anisotropic nanoparticles can be prepared without using highly sophisticated methods like electron beam lithography or focused ion beam techniques. As one might have to extract the nanoparticles or at least theirs tips from the surrounding matrix material to realize photonic applications, we will show that an extraction is easily possible by selectively etching the matrix. This extraction process does not influence the particle distribution, i.e. particles can be prepared and extracted at distinct positions on the substrate utilizing a patterning of the Au seed layer. A spectral characterization of extracted as well as embedded particles will be presented based on microspectroscopy as well as on measurements using an integrating sphere.

Katzer, C.; Westerhausen, M.; Naujok, P.; Bernhardt, H.; Schmidl, G.; Fritzsche, W.; Undisz, A.; Drüe, M.; Rettenmayr, M.; Schmidl, F.

2013-09-01

125

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

We consider the representation of operators in terms of tensor networks and their application to the ground-state approximation and time evolution of systems with long-range interactions. We provide an explicit construction to represent an arbitrary many-body Hamilton operator in terms of a one-dimensional tensor network (i.e., as a matrix product operator). For pairwise interactions, we show that such a representation is always efficient and requires a tensor dimension growing only linearly with the number of particles. For systems obeying certain symmetries or restrictions we find optimal representations with minimal tensor dimension. We discuss the analytic and numerical approximation of operators in terms of low-dimensional tensor operators. We demonstrate applications for time evolution and the ground-state approximation, in particular for long-range interaction with inhomogeneous couplings. The operator representations are also generalized to other geometries such as trees and two-dimensional lattices, where we show how to obtain and use efficient tensor network representations respecting a given geometry.

Froewis, F.; Nebendahl, V.; Duer, W. [Institut fuer Theoretische Physik, Universitaet Innsbruck, Technikerstrasse 25, A-6020 Innsbruck (Austria)

2010-06-15

126

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

127

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

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

128

47 CFR 0.483 - Applications for amateur or commercial radio operator licenses.

Code of Federal Regulations, 2013 CFR

...2013-10-01 false Applications for amateur or commercial radio operator licenses...Examinations § 0.483 Applications for amateur or commercial radio operator licenses. (a) Application filing procedures for amateur radio operator licenses are set...

2013-10-01

129

47 CFR 0.483 - Applications for amateur or commercial radio operator licenses.

Code of Federal Regulations, 2012 CFR

...2012-10-01 false Applications for amateur or commercial radio operator licenses...Examinations § 0.483 Applications for amateur or commercial radio operator licenses. (a) Application filing procedures for amateur radio operator licenses are set...

2012-10-01

131

47 CFR 0.483 - Applications for amateur or commercial radio operator licenses.

Code of Federal Regulations, 2011 CFR

...2011-10-01 false Applications for amateur or commercial radio operator licenses...Examinations § 0.483 Applications for amateur or commercial radio operator licenses. (a) Application filing procedures for amateur radio operator licenses are set...

2011-10-01

132

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

133

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

134

135

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

136

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

137

47 CFR 0.483 - Applications for amateur or commercial radio operator licenses.

Code of Federal Regulations, 2010 CFR

...Applications for amateur or commercial radio operator licenses. 0.483 Section...Applications for amateur or commercial radio operator licenses. (a) Application filing procedures for amateur radio operator licenses are set forth in...

2010-10-01

138

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

Code of Federal Regulations, 2010 CFR

...Applicability of rules for eligible on-demand operations. 135.4 Section 135...OPERATING REQUIREMENTS: COMMUTER AND ON DEMAND OPERATIONS AND RULES GOVERNING PERSONS...Applicability of rules for eligible on-demand operations. (a) An “eligible...

2010-01-01

139

NASA Technical Reports Server (NTRS)

The Department of Defense (DoD) defined System Operational Effectiveness (SOE) model provides an exceptional framework for an affordable approach to the development and operation of space launch vehicles and their supporting infrastructure. The SOE model provides a focal point from which to direct and measure technical effectiveness and process efficiencies of space launch vehicles. The application of the SOE model to a space launch vehicle's development and operation effort leads to very specific approaches and measures that require consideration during the design phase. This paper provides a mapping of the SOE model to the development of space launch vehicles for human exploration by addressing the SOE model key points of measurement including System Performance, System Availability, Technical Effectiveness, Process Efficiency, System Effectiveness, Life Cycle Cost, and Affordable Operational Effectiveness. In addition, the application of the SOE model to the launch vehicle development process is defined providing the unique aspects of space launch vehicle production and operations in lieu of the traditional broader SOE context that examines large quantities of fielded systems. The tailoring and application of the SOE model to space launch vehicles provides some key insights into the operational design drivers, capability phasing, and operational support systems.

Watson, Michael D.; Kelley, Gary W.

2012-01-01

140

The extracellular matrix is a structural support network made up of diverse proteins, sugars and other components. It influences a wide number of cellular processes including migration, wound healing and differentiation, all of which is of particular interest to researchers in the field of tissue engineering. Understanding the composition and structure of the extracellular matrix will aid in exploring the ways the extracellular matrix can be utilised in tissue engineering applications especially as a scaffold. This review summarises the current knowledge of the composition, structure and functions of the extracellular matrix and introduces the effect of ageing on extracellular matrix remodelling and its contribution to cellular functions. Additionally, the current analytical technologies to study the extracellular matrix and extracellular matrix–related cellular processes are also reviewed. PMID:25610589

Kular, Jaspreet K; Basu, Shouvik

2014-01-01

141

InkTag: Secure Applications on an Untrusted Operating System

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

142

This paper presents the SPMC topology that operates as an uninterruptible power supply circuit (UPS) incorporating unity power factor control. A single circuit is developed that performs both the rectifier and inverter operation may also incorporate active power filter operation. Commutation strategies are also implemented with reduction in spikes, a common phenomenon in matrix converter topologies. Results of simulations and

Mustafar Kamal Hamzah; Mohamad Fadzil Saidon; S. Z. M. Noor

2006-01-01

143

Evaluation of the Trajectory Operations Applications Software Task (TOAST)

NASA Technical Reports Server (NTRS)

The Trajectory Operations Applications Software Task (TOAST) is a software development project under the auspices of the Mission Operations Directorate. Its purpose is to provide trajectory operation pre-mission and real-time support for the Space Shuttle program. As an Application Manager, TOAST provides an isolation layer between the underlying Unix operating system and the series of user programs. It provides two main services: a common interface to operating system functions with semantics appropriate for C or FORTRAN, and a structured input and output package that can be utilized by user application programs. In order to evaluate TOAST as an Application Manager, the task was to assess current and planned capabilities, compare capabilities to functions available in commercially-available off the shelf (COTS) and Flight Analysis Design System (FADS) users for TOAST implementation. As a result of the investigation, it was found that the current version of TOAST is well implemented and meets the needs of the real-time users. The plans for migrating TOAST to the X Window System are essentially sound; the Executive will port with minor changes, while Menu Handler will require a total rewrite. A series of recommendations for future TOAST directions are included.

Perkins, Sharon; Martin, Andrea; Bavinger, Bill

1990-01-01

144

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

145

Fire protection system operating experience review for fusion applications

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

146

as independent variables and updated them using a numerical method proposed by Broyden (1965), which saves considerable amounts of computer time. Pendon et al. (1973) developed a similar procedure to solve separation problems at unsteady state by choosing... first partial derivatives are also continuous functions. ln addition to this, the use of the Jacobian method of determinants to minimize the number of computer solutions required to evaluate the elements of the relative gain matrix numerically...

Mijares Cervantes, Gerardo

2012-06-07

147

A Butler matrix (BM) for UMTS applications is presented. The Butler matrix was fabricated by conventional photolithography on a single laminate. The design is compact and complies with the required bandwidth. The design is based on the use of an elliptical coupler with certain geometrical characteristics, and a Lange coupler as a crossover. Furthermore, a design-scaling procedure that produces an

Theodoros Kaifas; John Sahalos

2006-01-01

148

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

149

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

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

150

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

151

Re) Configurable Real-Time Operating Systems and Their Applications

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

152

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

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

153

LBB application in the US operating and advanced reactors

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

154

An application of intertwining operators in functional analysis

NASA Astrophysics Data System (ADS)

We consider classes of integral operators on the spaces of square-integrable functions on the sphere and of locally integrable functions on Lobachevsky space. The kernels of these operators depend only on the distance between points in the spherical and hyperbolic geometry, respectively. These operators are intertwining for the quasi-regular representation of the corresponding Lie group, and this enables us to evaluate their spectra and diagonalize the operators themselves. As applications, we take the Minkowski problem and the Funk-Hecke theorem for Euclidean space \\mathbb R^n. A generalization is obtained of the Funk-Hecke theorem in the case of hyperbolic space \\mathbb R^{n-1,1} with indefinite inner product.

Shtepin, V. V.; Shtepina, T. V.

2009-12-01

155

Federal Register 2010, 2011, 2012, 2013

...Notice: 7876] Application for Presidential Permit To Construct, Operate and...Receipt of Application for a Presidential Permit to Construct, Operate and...L.P. has applied for a Presidential Permit to construct and operate...

2012-05-10

156

NASA Astrophysics Data System (ADS)

Employing the Mueller matrix method with polar decomposition, we analyse the polarization rotation (PR) effects in semiconductor optical amplifiers (SOAs) and demonstrate that the PR angle is linear to the birefringence dependent gain while the average PR coefficient is about 0.625 for the employed SOA. It is further evident that the current and optical intensity dependent PRs rotate reversely around the same axis. Thus we propose an optical-electric synchronous control scheme to obtain orthogonal polarization states with power-equalization, and implement it by a polarization-sensitive SOA. The polarization duration time is about 10 ns which is applicable to high-speed polarization state generation.

Li, Zheng-Yong; Wu, Chong-Qing; Shum, Ping; Dong, Hui

2008-11-01

157

Cryogenic system operating experience review for fusion applications

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

158

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

159

Generalized complement operators and applications in some semirings

Generalized complement operators on the semiring of all Boolean matrices as semilattice homomorphisms are considered. Some applications in solving equations on the set Bn of all binary relations are developed. In particular the structure of B3 is investigated by computer methods. Specific properties of the subsemigroup generated by all irregular relations in B3 are found. Stochastic experiments on the monoid Bn were made. The frequency of irregular elements as well as those of solvable equations depending on n is examined.

Bijev, G. [Technical University of Sofia, 8, Kl.Ohridski Blvd, 1000 Sofia (Bulgaria)

2013-12-18

160

Generalized complement operators and applications in some semirings

NASA Astrophysics Data System (ADS)

Generalized complement operators on the semiring of all Boolean matrices as semilattice homomorphisms are considered. Some applications in solving equations on the set Bn of all binary relations are developed. In particular the structure of B3 is investigated by computer methods. Specific properties of the subsemigroup generated by all irregular relations in B3 are found. Stochastic experiments on the monoid Bn were made. The frequency of irregular elements as well as those of solvable equations depending on n is examined.

Bijev, G.

2013-12-01

161

The Chemical Stockpile Emergency Preparedness (CSEP) Program is a wide-ranging activity in support of a national initiative involving the U.S. Army Chemical Materiel Command (CMA), the Federal Emergency Management Agency (FEMA), 9 states, and 37 counties. Established in 1988, the CSEP Program enhances emergency planning for the unlikely event of a release of hazardous chemical weapons agent from one of the Army's chemical weapons storage installations currently storing chemical weapons. These obsolete weapons are scheduled to be destroyed; meanwhile, however, they pose a threat to installation workers and residents of the surrounding communities. Argonne's CSEP Program includes a variety of components that serve the needs of multiple program participants. Among the major activities are: (1) Development of the Emergency Planning Synchronization Matrix to facilitate integration of multi-jurisdictional emergency plans: (a) Coordinating, Integrating, and Synchronizing Disaster Response: Use of an Emergency Response Synchronization Matrix in Emergency Planning, Exercises, and Operations. A graphical depiction of the entire emergency response process via a synchronization matrix is an effective management tool for optimizing the design, exercise, and real-life implementation of emergency plans. This system-based approach to emergency planning depicts how a community organizes its response tasks across space and time. It gives responders the opportunity to make real-time adjustments to maximizing the often limited resources in protecting area residents. An effective response to any natural or technological hazard must involve the entire community and must not be limited by individual jurisdictions and organizations acting on their own without coordination, integration, and synchronization. An emergency response to an accidental release of chemical warfare agents from one of this nation's eight chemical weapons stockpile sites, like any other disaster response, is complex. It requires the rapid coordination, integration, and synchronization of multiple levels of governmental and nongovernmental organizations from numerous jurisdictions, each with varying response capabilities, into a unified community response. The community response actions occur in an area extending from an on-site storage location to points 25 or more miles away. Actions are directed and controlled by responding local governments and agencies situated within the response area, as well as by state and federal operations centers quite removed from the area of impact. Time is critical and the protection action decision-making process is greatly compressed. To ensure an effective response with minimal confusion, given the potential catastrophic nature of such releases, the response community must carefully synchronize response operations.

Hewett, P. L., Jr.; Mitrani, J. E.; Metz, W. C.; Vercellone, J. J.; Decision and Information Sciences

2001-11-01

162

NASA Astrophysics Data System (ADS)

Thermal ageing of polymer-matrix composite materials of any long-life spacecraft in LEO involves evolution of mechanical, thermophysical and morphological properties, especially if the structure operates under external mechanical stress like bending. Behavior of KMU-4l carbon/epoxy composite material under combined effect of thermal profiles and static mechanical loading has been studied in a simulated LEO space environment. Thermal cycling was performed on specimens under bending stress reaching 30.4% of the material ultimate strength. Specimens subjected to combined thermal and mechanical fatigue were examined in a series of 4 intermediate points with a maximum of 120 cycles. The DMTA technique has been employed to follow the global thermomechanical response of KMU-4l composite. The degradation produced was detected by moisture diffusion analysis, the crack density was estimated at the edges of the specimens using a scanning electron microscope. Effects such as the temperature dependence of material properties and matrix post-curing phenomena are also discussed. The results are compared with the appropriate data obtained on specimens of KMU-4l exposed for up to 1501 days to LEO space environments onboard SALYUT and MIR space stations.

Issoupov, V.; Viel-Inguimbert, V.; Dinguirard, M.; Startsev, O. V.; Nikishin, E. F.

2003-09-01

163

Optimum Design of a 4x4 Planar Butler Matrix Array for WLAN Application

In recent years, high-speed wireless communication is in vogue. In wireless communication systems, multipath fading, delay and interference occurres by reflection or diffraction. In a high-speed wireless communication, it becomes a necessary to separate desired signal from delay or interference signal. Thus to overcome these problems Smart antenna systems have been developed. Basically there are two types of smart antenna systems, one is Switched beam system and another Adaptive array system.This paper presents the optimum design of a 4x4 plannar Butler matrix array as a key component of a switched beam smart antenna system, operating at 5.2 GHz for WLAN with a dielectric substrate, FR4 of er =4.9 and h=1.6mm. Conception details, simulation results and measurements are also given for the components (microstrip antenna, hybrid couplers, cross-coupler, phase shifter) used to implement the matrix. In this dissertation, mathematical calculations for all the components using MATLAB is done and then every individua...

Bhowmik, Wriddhi

2010-01-01

164

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

165

3-Dimensional conditions for the culture of Bone Marrow-derived Stromal/Stem Cells (BMSCs) can be generated with scaffolds of biological origin. Cardiogel, a cardiac fibroblast-derived Extracellular Matrix (ECM) has been previously shown to promote cardiomyogenic differentiation of BMSCs and provide protection against oxidative stress. To determine the matrix composition and identify significant proteins in cardiogel, we investigated the differences in the composition of this nanomatrix and a BMSC-derived ECM scaffold, termed as ‘mesogel’. An optimized protocol was developed that resulted in efficient decellularization while providing the maximum yield of ECM. The proteins were sequentially solubilized using acetic acid, Sodium Dodecyl Sulfate (SDS) and Dithiothreitol (DTT). These proteins were then analyzed using surfactant-assisted in-solution digestion followed by nano-liquid chromatography and tandem mass spectrometry (nLC-MS/MS). The results of these analyses revealed significant differences in their respective compositions and 17 significant ECM/matricellular proteins were differentially identified between cardiogel and mesogel. We observed that cardiogel also promoted cell proliferation, adhesion and migration while enhancing cardiomyogenic differentiation and angiogenesis. In conclusion, we developed a reproducible method for efficient extraction and solubilization of in vitro cultured cell-derived extracellular matrix. We report several important proteins differentially identified between cardiogel and mesogel, which can explain the biological properties of cardiogel. We also demonstrated the cardiomyogenic differentiation and angiogenic potential of cardiogel even in the absence of any external growth factors. The transplantation of Bone Marrow derived Stromal/Stem Cells (BMSCs) cultured on such a nanomatrix has potential applications in regenerative therapy for Myocardial Infarction (MI). PMID:25521816

Santhakumar, Rajalakshmi; Vidyasekar, Prasanna; Verma, Rama Shanker

2014-01-01

166

MIRIADS: miniature infrared imaging applications development system description and operation

NASA Astrophysics Data System (ADS)

A cooperative effort between the U.S. Air Force Research Laboratory, Nova Research, Inc., the Raytheon Infrared Operations (RIO) and Optics 1, Inc. has successfully produced a miniature infrared camera system that offers significant real-time signal and image processing capabilities by virtue of its modular design. This paper will present an operational overview of the system as well as results from initial testing of the 'Modular Infrared Imaging Applications Development System' (MIRIADS) configured as a missile early-warning detection system. The MIRIADS device can operate virtually any infrared focal plane array (FPA) that currently exists. Programmable on-board logic applies user-defined processing functions to the real-time digital image data for a variety of functions. Daughterboards may be plugged onto the system to expand the digital and analog processing capabilities of the system. A unique full hemispherical infrared fisheye optical system designed and produced by Optics 1, Inc. is utilized by the MIRIADS in a missile warning application to demonstrate the flexibility of the overall system to be applied to a variety of current and future AFRL missions.

Baxter, Christopher R.; Massie, Mark A.; McCarley, Paul L.; Couture, Michael E.

2001-10-01

167

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

168

Vacuum system operating experience review for fusion applications

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

169

Protein crystallization with microseed matrix screening: application to human germline antibody Fabs

The crystallization of 16 human antibody Fab fragments constructed from all pairs of four different heavy chains and four different light chains was enabled by employing microseed matrix screening (MMS). In initial screening, diffraction-quality crystals were obtained for only three Fabs, while many Fabs produced hits that required optimization. Application of MMS, using the initial screens and/or refinement screens, resulted in diffraction-quality crystals of these Fabs. Five Fabs that failed to give hits in the initial screen were crystallized by cross-seeding MMS followed by MMS optimization. The crystallization protocols and strategies that resulted in structure determination of all 16 Fabs are presented. These results illustrate the power of MMS and provide a basis for developing future strategies for macromolecular crystallization. PMID:25084393

Obmolova, Galina; Malia, Thomas J.; Teplyakov, Alexey; Sweet, Raymond W.; Gilliland, Gary L.

2014-01-01

170

Improvements in sparse matrix/vector technique applications for on-line load flow calculation

Sparsity technique is applied to a wide range of problems in power systems analysis. In this paper the authors propose several analytical and computational improvements in sparsity applications. The new partial matrix refactorization method and ordering algorithm are presented. The proposed method is very efficient when applied to various kinds of programs, such as: on-line load flow, optimal power flow and steady-state security analysis. The proposed methodology is applied in a fast decoupled load flow program which include the treatment of tap violations on under-load tap changing (ULTC) transformers and reactive power generation on PV buses. Effects of proposed improvements are well tested and documented on the three networks: 118 bus IEEE test network and two utility networks with 209 and 519 buses, respectively. Keywords: sparsity technique, load flow analysis, security analysis.

Ristanovic, P.; Bjelogrlic, M.; Babic, B.S.

1989-02-01

171

NASA Astrophysics Data System (ADS)

We present a way of constructing continuous matrix product states (cMPS) for coupled fields. The cMPS is a variational ansatz for the ground state of quantum field theories in one dimension. Our proposed scheme is based on a physical interpretation in which the cMPS class can be produced by means of a dissipative dynamic of a system interacting with a bath. We study the case of coupled bosonic fields. We test the method with previous DMRG results in coupled Lieb-Liniger models. Besides, we discuss a novel application for characterizing the Luttinger liquid theory emerging in the low-energy regime of these theories. Finally, we propose a circuit QED architecture as a quantum simulator for coupled fields.

Quijandría, Fernando; García-Ripoll, Juan José; Zueco, David

2014-12-01

172

High performance polymers and polymer matrix composites for spacecraft structural applications

NASA Technical Reports Server (NTRS)

A program implemented by NASA Langley Research Center to develop and evaluate new polymers and polymer matrix composites for spacecraft structural applications is examined. Various polymeric films, moldings, and adhesives are evaluated for resistance to atomic oxygen and high energy electron and UV radiation. Thin films from the poly(arylene ether)s containing phenylphosphine oxide groups and the siloxane-epoxies exhibited minor weight loss compared to Kapton polyimide after exposure. Large doses (greater than 10 exp 9 rads) of electron radiation, simulating 30 yr of exposure in GEO, are found to alter the chemical structure of epoxies by both chain scission and cross-linking. The thermal cycling representative of both LEO and GEO environments can cause microcracking in composites which can in turn affect the dimensional stability and produce mechanical property reductions. The processing and fabrication issues associated with precision composite spacecraft components are also addressed.

Bowles, D. E.; Connell, J. W.

1992-01-01

173

NASA Astrophysics Data System (ADS)

The applicability of variable impedance fluidic flexible matrix composites (F2MC) is investigated for development of prosthetic and orthotic devices. The F2MC material is an innovative combination of high performance composite tubes containing high bulk modulus fluids. The new material system can potentially achieve a change in stiffness of several orders of magnitude through valve control. The F2MC material system is investigated in this research through analytical studies for active impedance control for load transfer reduction in transtibial prosthetic sockets and impedance joint control for ankle-foot orthoses (AFO). Preliminary analysis results indicate that the variable modulus system can reduce the load transfer between the limb and transtibial socket and can provide impedance tailoring for improving foot-slap in an AFO.

Philen, M.

2009-10-01

174

ZnO:H indium-free transparent conductive electrodes for active-matrix display applications

NASA Astrophysics Data System (ADS)

Transparent conductive electrodes based on hydrogen (H)-doped zinc oxide (ZnO) have been proposed for active-matrix (AM) display applications. When fabricated with optimal H plasma power and optimal plasma treatment time, the resulting ZnO:H films exhibit low sheet resistance of 200 ?/? and high average transmission of 85% at a film thickness of 150 nm. The demonstrated transparent conductive ZnO:H films can potentially replace indium-tin-oxide and serve as pixel electrodes for organic light-emitting diodes as well as source/drain electrodes for ZnO-based thin-film transistors. Use of the proposed ZnO:H electrodes means that two photomask stages can be removed from the fabrication process flow for ZnO-based AM backplanes.

Chen, Shuming; Wang, Sisi

2014-12-01

175

High Strain-Rate Mechanical Behaviour of a Copper Matrix Composite for Nuclear Applications

Aim of this work is the investigation of mechanical behaviour of an alumina dispersion strengthened copper, known by the trade name GLIDCOP®, subjected to dynamic loads: it is a composite material with a copper matrix strengthened with aluminium oxide ceramic particles. Since the particle content is quite small the material keeps the OFE copper physical properties, such as thermal and electrical conductivity, but with a higher yield strength, like a mild-carbon steel. Besides, with the addition of aluminium oxide, the good mechanical properties are retained also at high temperatures and the resistance to thermal softening is increased: the second phase blocks the dislocation movement preventing the grain growth. Thanks to these properties GLIDCOP® finds several applications in particle accelerator technologies, where problems of thermal management, combined with structural requirements, play a key role. Currently, it is used for the construction of structural and functional parts of the particle beam collim...

Peroni, L

2012-01-01

176

Leak before break application in French PWR plants under operation

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

177

Ground Operations Aerospace Language (GOAL). Volume 5: Application Studies

NASA Technical Reports Server (NTRS)

The Ground Operations Aerospace Language (GOAL) was designed to be used by test oriented personnel to write procedures which would be executed in a test environment. A series of discussions between NASA LV-CAP personnel and IBM resulted in some peripheral tasks which would aid in evaluating the applicability of the language in this environment, and provide enhancement for future applications. The results of these tasks are contained within this volume. The GOAL vocabulary provides a high degree of readability and retainability. To achieve these benefits, however, the procedure writer utilizes words and phrases of considerable length. Brief form study was undertaken to determine a means of relieving this burden. The study resulted in a version of GOAL which enables the writer to develop a dialect suitable to his needs and satisfy the syntax equations. The output of the compiler would continue to provide readability by printing out the standard GOAL language. This task is described.

1973-01-01

178

Schwinger-Dyson operators as invariant vector fields on a matrix model analog of the group of loops

NASA Astrophysics Data System (ADS)

For a class of large-N multimatrix models, we identify a group G that plays the same role as the group of loops on space-time does for Yang-Mills theory. G is the spectrum of a commutative shuffle-deconcatenation Hopf algebra that we associate with correlations. G is the exponential of the free Lie algebra. The generating series of correlations is a function on G and satisfies quadratic equations in convolution. These factorized Schwinger-Dyson or loop equations involve a collection of Schwinger-Dyson operators, which are shown to be right-invariant vector fields on G, one for each linearly independent primitive of the Hopf algebra. A large class of formal matrix models satisfying these properties are identified, including as special cases, the zero momentum limits of the Gaussian, Chern-Simons, and Yang-Mills field theories. Moreover, the Schwinger-Dyson operators of the continuum Yang-Mills action are shown to be right-invariant derivations of the shuffle-deconcatenation Hopf algebra generated by sources labeled by position and polarization.

Krishnaswami, Govind S.

2008-06-01

179

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

180

NASA Astrophysics Data System (ADS)

In this paper, we review the radiative transfer formalism of the matrix operator method, and present the analytic form for its differentiation with respect to aerosol optical thickness, microphysical parameters and surface parameters. This “linearization” is an exact method that allows for an accurate and speedy computation of the Jacobian matrix, which is key to most optimization-based retrieval methods. We define an aerosol in terms of its optical thickness, complex refractive index and lognormal size distribution. We consider a bimodal aerosol distribution, consisting of a fine and coarse mode, such that the two modes also differ in their respective complex refractive indices. Three types of surfaces have been considered, viz. a purely Lambertian surface, a modified Rahman-Pinty-Verstraete bidirectional reflecting surface, and a Fresnel-reflecting ocean surface. We verify our results by comparing our linearized Jacobians of normalized intensities calculated at four different wavelengths in the visible (VIS) and near-infrared (NIR) and viewing angles ranging from -75° through 0° to 75° with those computed by the method of finite differences. We demonstrate the guaranteed accuracy of the linearized approach by contrasting it with the finite difference method which can only be used as a rough estimate due to its sensitivity to step size, especially for derivatives with respect to aerosol microphysical parameters. We also report that the computational speed-up due to linearization improves with the number of parameters involved, parity being achieved with the finite difference method for just one parameter. Finally, we discuss the features of the illustrated Jacobians as a function of viewing angle and wavelengths.

Sanghavi, Suniti V.; Martonchik, John V.; Davis, Anthony B.; Diner, David J.

2013-02-01

181

An Empirically Based Method of Q-Matrix Validation for the DINA Model: Development and Applications

ERIC Educational Resources Information Center

Most model fit analyses in cognitive diagnosis assume that a Q matrix is correct after it has been constructed, without verifying its appropriateness. Consequently, any model misfit attributable to the Q matrix cannot be addressed and remedied. To address this concern, this paper proposes an empirically based method of validating a Q matrix used…

de la Torre, Jimmy

2008-01-01

182

Matrix Fatigue Cracking Mechanisms of Alpha(2) TMC for Hypersonic Applications

NASA Technical Reports Server (NTRS)

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, Timothy P.; Gayda, John

1994-01-01

183

NASA Astrophysics Data System (ADS)

The deterministic quantum transfer-matrix (QTM) technique, its mathematical background, effectiveness and applicability to the real physical low-dimensional magnetic systems are presented. Modelling is based on the Heisenberg Hamiltonian which describes the macroscopic Haldane-gap and molecular-based spin S=1 chains, small size magnetic clusters embedded in some supramolecules and other interesting compounds. Using QTM, the spin degrees of freedom are accurately taken into account, yielding the thermodynamical functions at finite temperatures. The finite-temperature results for some isotropic and anisotropic systems as well as for systems with uniform and non-uniform interactions are reviewed. For Yb4As3 with antisymmetric interactions new results are presented--the field-dependent specific heat for finite chains and the field dependence of the energy gap. In order to demonstrate the effectiveness and applicability of the method to modelling of non-magnetic impurity effects, variation of the QTM approximants is shown for finite segments.As the computational complexity of our problems is exponential, the efficiency of parallelization using the Message Passing Interface (MPI) system library was analysed and estimated as close to 100% for our platform SGI Origin 3800 with 64 processor units. For the quantum chain simulations, both the memory and CPU bound for kBT/J[less-than-or-equals, slant]0.1 was established. For the finite ring simulations, the CPU time resources imposed the limits.

Kamieniarz, G.; Matysiak, R.

2006-05-01

184

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.

185

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

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

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

1995-01-01

186

NASA Technical Reports Server (NTRS)

A method of solving a class of linear matrix equations over various rings is proposed, using results from linear geometric control theory. An algorithm, successfully implemented, is presented, along with non-trivial numerical examples. Applications of the method to the algebraic control system design methodology are discussed.

Packard, A. K.; Sastry, S. S.

1986-01-01

187

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

188

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.

189

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

190

NASA Astrophysics Data System (ADS)

In the present work, we propose a deterministic numerical solver for the homogeneous Boltzmann equation based on Discontinuous Galerkin (DG) methods. The weak form of the collision operator is approximated by a quadratic form in linear algebra setting. We employ the property of "shifting symmetry" in the weight matrix to reduce the computing complexity from theoretical O(N3) down to O(N2) , with N the total number of freedom for d-dimensional velocity space. In addition, the sparsity is also explored to further reduce the storage complexity. To apply lower order polynomials and resolve loss of conserved quantities, we invoke the conservation routine at every time step to enforce the conservation of desired moments (mass, momentum and/or energy), with only linear complexity. Due to the locality of the DG schemes, the whole computing process is well parallelized using hybrid OpenMP and MPI. The current work only considers integrable angular cross-sections under elastic and/or inelastic interaction laws. Numerical results on 2-D and 3-D problems are shown.

Gamba, Irene M.; Zhang, Chenglong

2014-12-01

191

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

192

NASA Astrophysics Data System (ADS)

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

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

1992-06-01

193

Applications of matrix derivatives to optimization problems in statistical pattern recognition

NASA Technical Reports Server (NTRS)

A necessary condition for a real valued Frechet differentiable function of a vector variable have an extremum at a vector x sub 0 is that the Frechet derivative vanishes at x sub 0. A relationship between Frechet differentials and matrix derivatives was established that obtains a necessary condition on the matrix derivative at an extrema. These results are applied to various scalar functions of matrix variables which occur in statistical pattern recognition.

Morrell, J. S.

1975-01-01

194

Development of a microwave 20 x 20 switch matrix for 30/20 GHz SS-TDMA application

NASA Technical Reports Server (NTRS)

The design and fabrication of a 3-8 GHz, 20 x 20 Satellite Switched-Time Division Multiple Access IF switch matrix applicable to a 30/20 GHz communications satellite are described. An assessment of switch architecture in 1980 concluded that the GaAs FET-based coupled crossbar switch matrix, incorporating high speed CMOS LSI logic for switch crosspoint addressing, would be the optimum technology available for communications satellite switching by 1982. This assessment was based on such factors as switching speed, bandwidth, off-state isolation, and reliability, over a 10-year mission life. A proof-of-concept model's construction and testing are presented.

Cory, B. J.; Berkowitz, M.; Wallis, R.; Schiavone, A.; Shieh, D.; Campbell, J.

1982-01-01

195

NASA Astrophysics Data System (ADS)

A new algorithm is proposed for calculating the complete synthetic seismograms from a point source in the form of the sum of a single force and a dipole with an arbitrary seismic moment tensor in a plane layered medium composed of homogenous elastic isotropic layers. Following the idea of (Alekseev and Mikhailenko, 1978), an artificial cylindrical boundary is introduced, on which the boundary conditions are specified. For this modified problem, the exact solution (in terms of the displacements and stresses on the horizontal plane areal element) in the frequency domain is derived and substantiated. The unknown depth-dependent coefficients form the motion-stress vector, whose components satisfy the known system of ordinary differential equations. This system is solved by the method that involves the matrix impedance and propagator for the vector of motion, as previously suggested by the author in (Pavlov, 2009). In relation to the initial problem, the reflections from the artificial boundary are noise, which, to a certain degree, can be suppressed by selecting a long enough distance to this boundary and owing to the presence of a purely imaginary addition to the frequency. The algorithm is not constrained by the thickness of the layers, is applicable for any frequency range, and is suitable for computing the static offset.

Pavlov, V. M.

2013-01-01

196

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

197

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

198

Human fibroblast-derived extracellular matrix constructs for bone tissue engineering applications.

We exploited the biomimetic approach to generate constructs composed of synthetic biphasic calcium phosphate ceramic and extracellular matrix (SBC-ECM) derived from adult human dermal fibroblasts in complete xeno-free culture conditions. The construct morphology and composition were assessed by scanning electron microscopy, histology, immunohistochemistry, Western blot, glycosaminoglycan, and hydroxyproline assays. Residual DNA quantification, endotoxin testing, and local inflammatory response after implantation in a rat critical-sized calvarial defect were used to access the construct biocompatibility. Moreover, in vitro interaction of human mesenchymal stem cells (hMSCs) with the constructs was studied. The bone marrow- and adipose tissue-derived mesenchymal stem cells were characterized by flow cytometry and tested for osteogenic differentiation capacity prior seeding onto SBC-ECM, followed by alkaline phosphatase, 3-(4,5-dimethythiazol-2-yl)-2,5-diphenyl tetrazolium bromide assay, and real-time quantitative polymerase chain reaction to assess the osteogenic differentiation of hMSCs after seeding onto the constructs at different time intervals. The SBC-ECM constructs enhanced osteogenic differentiation of hMSCs in vitro and exhibited excellent handling properties and high biocompatibility in vivo. Our results highlight the ability to generate in vitro fibroblast-derived ECM constructs in complete xeno-free conditions as a step toward clinical translation, and the potential use of SBC-ECM in craniofacial bone tissue engineering applications. PMID:23471711

Tour, Gregory; Wendel, Mikael; Tcacencu, Ion

2013-10-01

199

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

200

Operational Applications from the Suomi Npp and Jpss Satellites

NASA Astrophysics Data System (ADS)

The Joint Polar Satellite System is NOAA's new operational satellite program and includes the SUOMI National Polar Partnership (NPP) as a bridge between NOAA's operational Polar Orbiting Environmental Satellite (POES) series, which began in 1978, and the first JPSS operational satellite scheduled for launch in 2017. JPSS provides critical data for key NOAA product and services, which the Nation depends on. These products and services include: Weather forecasting - data from the JPSS Cross-track Infrared Sounder (CrIS) and the Advanced Technology Microwave Sounder (ATMS) are needed to forecast weather events out to 7 days. Nearly 85% of all data used in weather forecasting are from polar orbiting satellites. Environmental monitoring - data from the JPSS Visible Infrared Imager Radiometer Suite (VIIRS) are used to monitor the environment including the health of coastal ecosystems, drought conditions, fire, smoke, dust, snow and ice, and the state of oceans, including sea surface temperature and ocean color. Climate monitoring - data from JPSS instruments, including OMPS, CERES and TSIS will provide continuity to climate data records established using NOAA POES and NASA Earth Observing System (EOS) satellite observations. These data records provide a unified and coherent long-term observation of the environment; the records and products are critical to climate modelers, scientists, and decision makers concerned with advancing climate change understanding, prediction, mitigation and adaptation strategies, and policies. Data collection - JPSS satellites continue the POES data collection instruments that relay in situ data and observations from remote transmitters. These instruments relay data from remote, unmanned stations including wind, temperature and salinity readings from ocean buoys, which allow for the monitoring of the ocean. These instruments are also used to track wildlife. Search and rescue - JPSS will continue the search and rescue instruments on POES that relay distress signals from aviators, mariners or land-based users in distress. This system assists in the rescue of hundreds on an annual basis. At the AGU conference, we will discuss in detail the operational applications of JPSS data and early demonstrations provided by SUOMI NPP. Examples will include improvements in weather forecasting, monitoring of coastal water quality (e.g. harmful algal blooms), marine resources, forest fires, volcanic eruptions and smoke/dust plumes, and monitoring of droughts, snow and ice cover. The quality of JPSS data for climate monitoring will also be discussed.

Goldberg, M.; Furgerson, J.; Sjoberg, W.; Weng, F.; Csiszar, I. A.; Kilcoyne, H.; Gleason, J. F.

2012-12-01

201

GIS applications for military operations in coastal zones

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

202

Novel Vibration Damping of Ceramic Matrix Composite Turbine Blades Developed for RLV Applications

NASA Technical Reports Server (NTRS)

The Reusable Launch Vehicle (RLV) represents the next generation of space transportation for the U.S. space program. The goal for this vehicle is to lower launch costs by an order of magnitude from $10,000/lb to $1,000/lb. Such a large cost reduction will require a highly efficient operation, which naturally will require highly efficient engines. The RS-2200 Linear Aerospike Engine is being considered as the main powerplant for the RLV. Strong, lightweight, temperature-resistant ceramic matrix composite (CMC) materials such as C/SiC are critical to the development of the RS-2200. Preliminary engine designs subject turbopump components to extremely high frequency dynamic excitation, and ceramic matrix composite materials are typically lightly damped, making them vulnerable to high-cycle fatigue. The combination of low damping and high-frequency excitation creates the need for enhanced damping. Thus, the goal of this project has been to develop well-damped C/SiC turbine components for use in the RLV. Foster-Miller and Boeing Rocketdyne have been using an innovative, low-cost process to develop light, strong, highly damped turbopump components for the RS-2200 under NASA s Small Business Innovation Research (SBIR) program. The NASA Glenn Research Center at Lewis Field is managing this work. The process combines three-dimensionally braided fiber reinforcement with a pre-ceramic polymer. The three-dimensional reinforcement significantly improves the structure over conventional two-dimensional laminates, including high through-the-thickness strength and stiffness. Phase I of the project successfully applied the Foster-Miller pre-ceramic polymer infiltration and pyrolysis (PIP) process to the manufacture of dynamic specimens representative of engine components. An important aspect of the program has been the development of the manufacturing process. Results show that the three-dimensionally braided carbon-fiber reinforcement provides good processability and good mechanical stiffness and strength in comparison to materials produced with competing processes as shown in the graphs.

Min, James B.

2000-01-01

203

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

NASA Technical Reports Server (NTRS)

Uniformly distributed particle-strengthened titanium matrix composites (TMCs) can be manufactured at lower cost than many types of continuous-fiber composites. The innovative manufacturing technology combines cold and hot isostatic pressing procedures to produce near-final-shape components. Material stiffness is increased up to 26-percent greater than that of components made with conventional titanium materials at no significant increase in the weight. The improved mechanical performance and low-cost manufacturing capability motivated an independent review to assess the improved properties of ceramic titanium carbide (TiC) particulate-reinforced titanium at elevated temperature. Researchers at the NASA Glenn Research Center creatively designed and executed deformation and durability tests to reveal operating regimes where these materials could lower the cost and weight of space propulsion systems. The program compares the elevated-temperature performance of titanium alloy Ti-6Al-4V matrix material to an alloy containing 10 wt% of TiC particles. Initial experiments showed that at these relatively low particle concentrations the material stiffness of the TMC was improved 20 percent over that of the plain Ti-6Al-4V alloy when tested at 427 C. The proportional limit and ultimate strength of the composite in tension are 21- and 14-percent greater than those of the plain alloy. Compression tests showed that the proportional limit is about 30 percent greater for TMC than for the plain alloy. The enhanced deformation resistance of the TMC was also evident in a series of tensile and compressive stress relaxation tests that were made. Specimens were subjected to tensile or compressive strain amplitudes of 0.75 percent for 24 hr followed by a return to zero strain imposed for 24 hr. The stress relaxation data were normalized with respect to the maximum stress for each case and plotted as a function of time in the following graph. Tensile stresses relaxed 19 percent for the TMC and 25 percent for the plain Ti-6Al-4V alloy. Compressive stresses relaxed 25 percent for the TMC and 39 percent for the plain Ti-6Al-4V alloy. The superior deformation resistance of the TMC extends to a creep rate that is 28-percent slower for the TMC when it is loaded to stress levels that are 26-percent higher than for the plain Ti-6Al-4V alloy.

Lerch, Bradley A.; Ellis, J. Rodney; Arnold. Steven M.

2004-01-01

204

We report on our computation of the hadronic matrix elements of the four-quark operators needed for the study of $K^0-{\\bar K^0}$ mixing beyond the Standard Model (SM). We consider nf=2+1 Domain-Wall fermions on Iwasaki gauge action with lightest unitary pion of 290 MeV and a single lattice spacing a=0.086 fm. The renormalization is performed non-perturbatively through the RI-MOM scheme and our results are converted perturbatively to MSbar. We have estimated the various systematic errors. Our results confirm a previous quenched study, where large ratios of non-SM to SM matrix elements were obtained.

Nicolas Garron; Peter A Boyle; Renwick J Hudspith; Andrew T Lytle

2012-12-12

205

A branch and bound (BB) algorithm for solving a general class of bilinear matrix inequality (BMI) problems is proposed. First, linear matrix inequality (LMI) constraints are incorporated into BMI constraints in a special way to take advantage of useful information on nonconvex terms. Then, the nonconvexity of the BMI is centralized in coupling constraints so that when the latter are

H. D. Tuan; P. Apkarian

2000-01-01

206

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

207

SPIN: an extensible microkernel for application-specific operating system services

Application domains such as multimedia, databases, and parallel computing, require operating system services with high performance and high functionality. Existing operating systems provide fixed interfaces and implementations to system services and resources. This makes them inappropriate for applications whose resource demands and usage patterns are poorly matched by the services provided. The SPIN operating system enables system services to be

Brian N. Bershad; Craig Chambers; Susan J. Eggers; Chris Maeda; Dylan McNamee; Przemyslaw Pardyak; Stefan Savage; Emin Gün Sirer

1994-01-01

208

NASA Technical Reports Server (NTRS)

For advanced aerospace propulsion systems, development of ceramic matrix composite integrally-bladed turbine disk technology is attractive for a number of reasons. The high strength-to-weight ratio of ceramic composites helps to reduce engine weight and the one-piece construction of a blisk will result in fewer parts count, which should translate into reduced operational costs. One shortcoming with blisk construction, however, is that blisks may be prone to high cycle fatigue due to their structural response to high vibration environments. Use of ceramic composites is expected to provide some internal damping to reduce the vibratory stresses encountered due to unsteady flow loads through the bladed turbine regions. A goal of our research was to characterize the vibration viscous damping behavior of C/SiC composites. The vibration damping properties were measured and calculated. Damping appeared to decrease with an increase in the natural frequency. While the critical damping amount of approximately 2% is required for typical aerospace turbomachinery engines, the C/SiC damping at high frequencies was less than 0.2% from our study. The advanced high-performance aerospace propulsion systems almost certainly will require even more damping than what current vehicles require. A purpose of this paper is to review some work on C/SiC vibration damping by the authors for the NASA CMC turbine blisk development program and address an importance of the further investigation of the blade vibration damping characteristics on candidate CMC materials for the NASA s advanced aerospace turbomachinery engine systems.

Min, James B.; Harris, Donald L.; Ting, J. M.

2011-01-01

209

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

210

NASA Astrophysics Data System (ADS)

Mueller matrix differential decomposition is a novel method for analyzing the polarimetric properties of optical samples. It is performed through an eigenanalysis of the Mueller matrix and the subsequent decomposition of the corresponding differential Mueller matrix into the complete set of 16 differential matrices which characterize depolarizing anisotropic media. The method has been proposed so far only for measurements in transmission configuration. In this work the method is extended to the backward direction. The modifications of the differential matrices according to the reference system are discussed. The method is successfully applied to Mueller matrices measured in reflection and backscattering.

Ortega-Quijano, Noé; Arce-Diego, José Luis

2011-07-01

211

Mueller matrix differential decomposition is a novel method for analyzing the polarimetric properties of optical samples. It is performed through an eigenanalysis of the Mueller matrix and the subsequent decomposition of the corresponding differential Mueller matrix into the complete set of 16 differential matrices which characterize depolarizing anisotropic media. The method has been proposed so far only for measurements in transmission configuration. In this work the method is extended to the backward direction. The modifications of the differential matrices according to the reference system are discussed. The method is successfully applied to Mueller matrices measured in reflection and backscattering. PMID:21934798

Ortega-Quijano, Noé; Arce-Diego, José Luis

2011-07-18

212

Analytical inversion of the hypersingular operator: Applications in the theory of antennae

Analytical inversion of the hypersingular operator is obtained and used to develop an effective numerical-analytical method\\u000a of solving hypersingular integral equations. Applications of the inverse operator to the theory of antennae are considered.

S. I. Éminov

2004-01-01

213

Federal Register 2010, 2011, 2012, 2013

...Docket No. 50-382; NRC-2012-0212] Wolf Creek Nuclear Operating Corporation, Wolf Creek Generating Station; Application for Amendment...or the Commission) has granted the request of Wolf Creek Nuclear Operating Corporation (the...

2012-09-12

214

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

Sparse Nonnegative Matrix Underapproximation and its Application to Hyperspectral Image Analysis6

and identify gas plumes such as those arising from leaks even when the gases are invisible to the human eye nonnegative matrix factorization (NMF), which improves interpretability of the decomposition. Recently

Plemmons, Robert J.

216

The Haddon matrix is a potential tool for recognizing hazards in any operating engineering system. This paper presents a case study of operational hazards at a large construction site. The fish bone structure helps to visualize and relate the chain of events, which led to the failure of the system. The two-tier Haddon matrix approach helps to analyze the problem and subsequently prescribes preventive steps. The cybernetic approach has been undertaken to establish the relationship among event variables and to identify the ones with most potential. Those event variables in this case study, based on the cybernetic concepts like control responsiveness and controllability salience, are (a) uncontrolled swing of sheet contributing to energy, (b) slippage of sheet from anchor, (c) restricted longitudinal and transverse swing or rotation about the suspension, (d) guilt or uncertainty of the crane driver, (e) safe working practices and environment. PMID:17362658

Mazumdar, Atmadeep; Sen, Krishna Nirmalya; Lahiri, Balendra Nath

2007-01-01

217

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

218

A mobile App for military operational entomology pesticide applications

Technology Transfer Automated Retrieval System (TEKTRAN)

Multiple field studies conducted for the Deployed War Fighter Protection (DWFP) research program have generated over 80 specific guidance points for innovative combinations of pesticide application equipment, pesticide formulations, and application techniques for aerosol and residual pesticide treat...

219

Code of Federal Regulations, 2010 CFR

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

2010-10-01

220

Code of Federal Regulations, 2012 CFR

...2012-10-01 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....

2012-10-01

221

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

222

Code of Federal Regulations, 2011 CFR

...2011-10-01 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....

2011-10-01

223

Machine tool for multiple operations, preferably for nuclear applications

Available from the Commission of European Communities, Luxembourg. A ; remotely controlled machine is described for multiple operations such as opening. ; unscrewing, welding and screwing of radioactive materials and articles comprising ; a circular plate on which are disposed a rotating plate with movable jaws, a ; turret with a tool carriage for said operations and a column with

R. Gillot; P. Montellanico; E. Righino; A. Sgarlata

1971-01-01

224

Transient response of perforated plate matrix heat exchangers

NASA Astrophysics Data System (ADS)

Perforated plate matrix heat exchangers are used in a number of applications such as helium liquefiers, Joule-Thompson cryocoolers operating with pure fluids and mixtures, etc. The time taken for cool down of cryocoolers is very critical in many applications, for example, those used in mobile applications (e.g. missiles). In this paper we study the effect of different parameters on the transient response of perforated plate matrix heat exchangers.

Ramesh, P.; Venkatarathnam, G.

225

Preparing the CAA Title V operating permit application

The CAA amendments contain 11 new and amended titles, including enhanced non-attainment area provisions, additional conditions for controlling hazardous air pollutants, expanded monitoring and record keeping requirements, and increased enforcement authority. The cornerstone of the regulation is the operating permits program (Title V). In the past, permits have been issued to construct or modify sources, and some sources have been permitted in states with operating permit programs. Such programs will remain in effect. However, under the new CAA, most emissions sources will be required to have an operating permit. Title V's permit provision initially affects about 34,000 major facilities and may affect another 350,000 smaller sources in the future. The amendments also increase the number of regulated pollutants from 21 to about 200. Operating permits limit emissions from manufacturing operations, and place further restrictions on raw materials and products.

Wyles, T.R. (Trinity Consultants Inc., Atlanta, GA (United States))

1994-01-01

226

RoboCon: Operator interface for robotic applications

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

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

1996-12-31

227

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

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

228

Autonomous mobile mesh networks and applications for defense network-centric operations

This paper presents an overview of mobile mesh networking technology and broadband multimedia applications that can support mission-critical operations for network-centric tactical defense operations. Such broadband, autonomous, rapidly deployable, and secure networking and distributed applications provide survivable and reliable means of providing timely information to military forces to gain information superiority and support efficient mission execution. In this paper, first,

Ambatipudi R. Sastry

2006-01-01

229

Evidence is reviewed that the operating characteristics of computer application systems, in addition to physical characteristics of display units (CRTs), are the cause of many observed effects on operator health and task effectiveness. These effects are hypothesized to occur through changes in task structure, and the man-machine redivision of labour that results when computer application systems are introduced into work

JON A. TURNER; ROBERT A. KARASEK JR

1984-01-01

230

Service management architecture is growing in importance for providing reliable telecommunications and operations services. This paper proposes a service operation and management architecture suitable for providing services in a distributed processing environment. The proposed architecture monitors application software elements (AEs) that constitute service applications (APs) and reside in different processing nodes in the telecommunications network. This monitoring function detects AE

Hiroki Tanaka; Hiroshi Ishii

1995-01-01

231

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

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

Xingyan Shi; Wei Zhang

2010-01-01

232

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

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

ALBERT RANGO; AHLAM I. SHALABY

1998-01-01

233

Some Unusual Matrix Eigenvalue Problems

. We survey some unusual eigenvalue problems arising in different applications. We show that all these problems can be cast as problems of estimating quadratic forms. Numerical algorithms based on the well-known Gauss-type quadrature rules and Lanczos process are reviewed for computing these quadratic forms. These algorithms reference the matrix in question only through a matrix-vector product operation. Hence it is well suited for large sparse problems. Some selected numerical examples are presented to illustrate the efficiency of such an approach. 1 Introduction Matrix eigenvalue problems play a significant role in many areas of computational science and engineering. It often happens that many eigenvalue problems arising in applications may not appear in a standard form that we usually learn from a textbook and find in software packages for solving eigenvalue problems. In this paper, we described some unusual eigenvalue problems we have encountered. Some of those problems have been ...

Zhaojun Bai And; Zhaojun Bai; Gene H. Golub

1999-01-01

234

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

235

To be mild! Mild oxidization of chemically converted graphene with diluted nitric acid produces low-oxidation and low-defect acid-oxidized graphene (AOG) material with excellent water dispersibility. In MALDI MS, the AOG matrix yielded significantly higher signals than graphene, graphene oxide, and conventional organic matrices for nonpolar analytes. PMID:23494774

Liu, Qian; Cheng, Mengting; Jiang, Guibin

2013-04-26

236

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

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

237

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

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

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

238

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

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

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

1978-01-01

239

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

Classification and Feature Selection on Matrix Data with Application to Gene-Expression Analysis

We consider the classification task for datasets which are described by matrices. Rows and columns of these matrices correspond to objects where row and column objects may be from different sets and column objects are labeled. Data matrix entries express relationships between row and column objects and are produced by an unknown kernel. These kernels represent dot products in some

Sepp Hochreiter

241

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

242

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

Not Available

1994-10-01

243

A 4 × 2 switch matrix in QFN24 package for 0.5–3 GHz application

NASA Astrophysics Data System (ADS)

This paper presents a 4 × 2 switching matrix implemented in the Win 0.5 ?m GaAs pseudomorphic high electron mobility transistor process, it covers the 0.5–3 GHz frequency range. The switch matrix is composed of 4 SPDT switch whose two output ports can simultaneously select the input port and a 4 to 8 bit digital decoder, both the radio frequency (RF) part and the digital part are integrated into one single chip. The chip is packaged in a low cost QFN24 plastic package. On chip shunt, capacitors at the input ports are taken to compensate for the bonding wire inductance effect. The designed switch matrix shows a good measured performance: the insertion loss is less than 5.5 dB, the isolation is no worse than 30 dB, the return loss of input ports and output ports is better than ?10 dB, the input 1 dB compression point is better than 25.6 dBm, and the OIP3 is better than 37 dBm. The chip size of the switch matrix is only 1.45 × 1.45 mm2.

Yuzhe, Liu; Pengfei, Mu; Renjie, Gong; Jing, Wan; Yulin, Zhang; Yuepeng, Yan

2014-12-01

244

Does the organic matrix constrain the application of trace element proxies in bivalve shells?

NASA Astrophysics Data System (ADS)

The use of trace element concentrations in the carbonate of bivalve shells (Figure 1 and 2) as proxies for temperature and/or salinity has been hampered so far by inconsistent and species specific relationships between environmental variable and assumed proxy. We used 13 different chemical treatments in order to remove the organic matrix from Arctica islandica shell powder. Two of the 13 treatments had a significant impact on trace element concentrations (Pb, Sr, Ba, Mg, Mn, U; ICP-MS): NaOCl incubation caused a significant decrease in Pb. Mucasol/Acetone treatment caused a significant decrease in Sr. As our results indicate, the organic matrix may be one cause for poor correlations between environmental variable and proxy. Incorporation of elements into the organic matrix is affected by biological and physiological processes, i.e. it distorts the physically determined correlation between environmental parameter and the examined proxy. Here, we find that in A. islandica the effect of the organic matrix needs to be taken into account when applying Sr/Ca and Pb/Ca proxies for temperature and anthropogenic pollution respectively. Figure 1. Umbo cross-section of Arctica islandica Figure 2. Sr88 profile measured with LA-ICP-MS along the line of strongest growth in the umbo of Arctica islandica

Krause-Nehring, J.; Nehrke, G.; Kriews, M.; Kluegel, A.; Brey, T.

2009-12-01

245

The application of image enhancement techniques to remote manipulator operation

NASA Technical Reports Server (NTRS)

Methods of image enhancement which can be used by an operator who is not experienced with the mechanisms of enhancement to obtain satisfactory results were designed and implemented. Investigation of transformations which operate directly on the image domain resulted in a new technique of contrast enhancement. Transformations on the Fourier transform of the original image, including such techniques as homomorphic filtering, were also investigated. The methods of communication between the enhancement system and the computer operator were analyzed, and a language was developed for use in image enhancement. A working enhancement system was then created, and is included.

Gonzalez, R. C.

1974-01-01

246

Department of Defense operational applications of wind measurements

NASA Technical Reports Server (NTRS)

A stated objective for this symposium is to identify requirements for global wind measurements. This paper will draw from recent reports which considered the impact of over 100 environmental factors known to affect military operations. A conclusion that can be drawn from those analyses is that one environmental factor, atmospheric wind, has an operational impact on each of the 48 mission areas examined. This paper will characterize the impact of wind on the various mission areas and will define and summarize both 'technical' and 'operational' requirements for wind intelligence.

Ramsay, Allan C.

1985-01-01

247

Improve Boiler System Operations- Application of Statistical Process Control

by improving steam boiler and boiler feedwater system operations. The processes were experiencing high maintenance cost due to metering pump and analyzer failures, equipment failures and fouling due to poor control of chemical treatment, and steam vent losses...

Scarr, D.; Shea, D.

248

This paper summarizes attempts of incorporating fly ash into aluminum castings to decrease the energy content, material content, cost, and weight of selected industrial components, while also improving selected properties. It is shown that fly ash can be incorporated in aluminum alloy matrix using stir casting and pressure infiltration techniques. The sand and permanent mold castings, which included differential covers,

P. K. Rohatgi; Nikhil Gupta

2006-01-01

249

Employing the Mueller matrix method with polar decomposition, we analyse the polarization rotation (PR) effects in semiconductor optical amplifiers (SOAs) and demonstrate that the PR angle is linear to the birefringence dependent gain while the average PR coefficient is about 0.625 for the employed SOA. It is further evident that the current and optical intensity dependent PRs rotate reversely around

Zheng-Yong Li; Chong-Qing Wu; Ping Shum; Hui Dong

2008-01-01

250

Residual energy applications program test and operations report

Objective of REAP in the recovery of waste heat at US gaseous diffusion plants by 1984. This report contains policy, objective, and guideline suggestions for utilizing the proposed Energy applied Systems Test (EAST) Facility and for managing EAST operations; preliminary design information on facility support equipment and physical plant; and estimates of initial construction costs and staffing requirements for a two-bay, three-shift operation. (DCL)

Zander, F.H.

1980-10-01

251

NASA Astrophysics Data System (ADS)

A new electrothermal space propulsion concept using waveguide heated plasmas was investigated. Attention was focused on the understanding of basic operational characteristics of this thruster concept. To this end, experimental testing of various waveguide applicator configurations was conducted. Waveguide-heated plasmas are not stable but tend to propagate toward the microwave power source due to heat conduction or radiative processes. A rectangular waveguide applicator was used to measure plasma propagation velocities. Plasma velocities in nitrogen were found to be around 10 cm/s. In helium two propagation modes were observed, one ranging in plasma velocities between 10 and 90 cm/s while the faster mode showed propagation velocities up to 2000 to 3000 cm/s. Inserting a bluff body made from boron nitride material into the gas flow enabled stabilization of the microwave discharge over given power ranges depending on mass flow rates and gas pressure. For the stabilized plasma in the rectangular guide up to 90 percent coupling efficiency, i.e. absorbed over total incident microwave power, were measured. However, it was observed that a rectangular waveguide plasma sustained in a TE(sub 10) electromagnetic field pattern touches the waveguide walls at two locations, possibly resulting in problems of thruster erosion and efficiency loss. Therefore a circular TM(sub 01) mode applicator was investigated. The microwave discharge in this applicator could be sustained well separated from the waveguide walls at coupling efficiencies up to 96 percent. For a simple converging conical nozzle arrangement, using measured data on power, pressure and mass flow rate and quasi-one dimensional nozzle flow theory, values for such rocket performance parameters as thruster efficiency, specific impulse and thrust were estimated to be 40 percent, 350 sec and 0.4 N, respectively.

Mueller, Juergen

252

NASA Astrophysics Data System (ADS)

Multichannel sound systems are being studied as part of the Eureka 95 and Radio-communication Bureau TG10-1 investigations into high definition television. One emerging sound system has five channels; three at the front and two at the back. This raises some compatibility issues. The listener might have only, say, two loudspeakers or the material to be broadcast may have fewer than five channels. The problem is how best to produce a set of signals to be broadcast, which is suitable for all listeners, from those that are available. To investigate this area, a device has been designed and built which has six input channels and six output channels. Each output signal is a linear combination of the input signals. The inputs and outputs are in AES/EBU digital audio format using BBC-designed AESIC chips. The matrix operation, to produce the six outputs from the six inputs, is performed by a Motorola DSP56001. The user interface and 'housekeeping' is managed by a T222 transputer. The operator of the matrix uses a VDU to enter sets of coefficients and a rotary switch to select which set to use. A set of analog controls is also available and is used to control operations other than the simple compatibility matrixing. The matrix has been very useful for simple tasks: mixing a stereo signal into mono, creating a stereo signal from a mono signal, applying a fixed gain or attenuation to a signal, exchanging the A and B channels of an AES/EBU bitstream, and so on. These are readily achieved using simple sets of coefficients. Additions to the user interface software have led to several more sophisticated applications which still consist of a matrix operation. Different multichannel panning laws have been evaluated. The analog controls adjust the panning; the audio signals are processed digitally using a matrix operation. A digital SoundField microphone decoder has also been implemented.

Mason, A. J.

253

Finding Nonoverlapping Substructures of a Sparse Matrix

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

254

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

255

The Trigonometry of Matrix Statistics

A matrix trigonometry developed chiefly by this author during the past 40 years has interesting applications to certain situations in statistics. The key conceptual entity in this matrix trigonometry is the matrix (maximal) turning angle. Associated entities (originally so-named by this author) are the matrix antieigenvalues and corresponding antieigenvectors upon which the matrix obtains its critical turning angles. Because this

Karl Gustafson

2006-01-01

256

Operator assistant systems - An experimental approach using a telerobotics application

NASA Technical Reports Server (NTRS)

This article presents a knowledge-based system methodology for developing operator assistant (OA) systems in dynamic and interactive environments. This is a problem both of training and design, which is the subject of this article. Design includes both design of the system to be controlled and design of procedures for operating this system. A specific knowledge representation is proposed for representing the corresponding system and operational knowledge. This representation is based on the situation recognition and analytical reasoning paradigm. It tries to make explicit common factors involved in both human and machine intelligence, including perception and reasoning. An OA system based on this representation has been developed for space telerobotics. Simulations have been carried out with astronauts and the resulting protocols have been analyzed. Results show the relevance of the approach and have been used for improving the knowledge representation and the OA architecture.

Boy, Guy A.; Mathe, Nathalie

1993-01-01

257

An improved Newton iteration for the generalized inverse of a matrix, with applications

NASA Technical Reports Server (NTRS)

The purpose here is to clarify and illustrate the potential for the use of variants of Newton's method of solving problems of practical interest on highly personal computers. The authors show how to accelerate the method substantially and how to modify it successfully to cope with ill-conditioned matrices. The authors conclude that Newton's method can be of value for some interesting computations, especially in parallel and other computing environments in which matrix products are especially easy to work with.

Pan, Victor; Schreiber, Robert

1990-01-01

258

Coherency matrix-based proper orthogonal decomposition with application to wind field simulation

Proper Orthogonal Decomposition (POD) provides a powerful modal transformation tool for stochastic dynamics. In this paper,\\u000a coherency matrix-based proper orthogonal decomposition (CPOD) is presented as an innovative form of the POD based on cross\\u000a power spectral density matrices. By introducing a discretizing scheme, the CPOD-based spectral representation method is obtained\\u000a for use in stochastic simulation. Moreover, some criteria are proposed

Liang Hu; Li Li; Jian Fan; Qinhan Fang

2006-01-01

259

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

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

260

Spaces of fractional quotients, discrete operators, and their applications. II

NASA Astrophysics Data System (ADS)

The theory of discrete operators in spaces of fractional quotients is developed. A theorem on the stability of discrete operators under smooth perturbations is proved. On this basis, using special quadrature formulae of rectangular kind, the convergence of approximate solutions of hypersingular integral equations to their exact solutions is demonstrated and a mathematical substantiation of the method of closed discrete vortex frameworks is obtained. The same line of argument is also applied to difference equations arising in the solution of the homogeneous Dirichlet problem for a general second-order elliptic equation with variable coefficients.

Lifanov, I. K.; Poltavskii, L. N.

1999-12-01

261

Application of the generalized shift operator to the Hankel transform.

It is well known that the Hankel transform possesses neither a shift-modulation nor a convolution-multiplication rule, both of which have found many uses when used with other integral transforms. In this paper, the generalized shift operator, as defined by Levitan, is applied to the Hankel transform. It is shown that under this generalized definition of shift, both convolution and shift theorems now apply to the Hankel transform. The operation of a generalized shift is compared to that of a simple shift via example. PMID:24877034

Baddour, Natalie

2014-01-01

262

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

263

Application and Operation of Audiovisual Equipment in Education.

ERIC Educational Resources Information Center

Interest in audiovisual aids in education has been increased by the shortage of classrooms and good teachers and by the modern predisposition toward learning by visual concepts. Effective utilization of audiovisual materials and equipment depends most importantly, on adequate preparation of the teacher in operating equipment and in coordinating…

Pula, Fred John

264

The application of NAVSTAR Differential GPS to civil helicopter operations

NASA Technical Reports Server (NTRS)

Principles concerning the operation of the NAVSTAR Global Positioning Systems (GPS) are discussed. Selective availability issues concerning NAVSTAR GPS and differential GPS concepts are analyzed. Civil support and market potential for differential GPS are outlined. It is concluded that differential GPS provides a variation on the baseline GPS system, and gives an assured, uninterrupted level of accuracy for the civilian community.

Beser, J.; Parkinson, B. W.

1981-01-01

265

Fast Explicit Operator Splitting Method. Application to the Polymer System

Computing solutions of convection-diffusion equations, especially in the convection dominated case, is an important and challenging problem that requires development of fast, reliable numerical methods. We propose a second-order fast explicit operator splitting (FEOS) method based on the Strang splitting. The main idea of the method is to solve the parabolic problem via a discretization of the formula for the

Alina Chertock; Alexander Kurganov; Guergana Petrova

266

Optical butterfly interconnections and applications in optical logic operations

NASA Astrophysics Data System (ADS)

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

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

1993-02-01

267

Program of KOTAC 2000 Operator Theory and Its Applications

Bong Jung (Kyungpook National University, Korea) 09:30-10:10 Sub-n-normal and sub-Jordan operators Carl and their examples Il Bong Jung and Sang Soo Park* (Kyungpook National University, Korea) 12:00 Conference photo 12

Lee, Woo Young

268

Program of KOTAC 2002 Operator Theory and Its Applications

:50-14:30 On the invariant subspace problem Carl Pearcy (Texas A&M Univ, USA) 14:30-14:40 Coffee Break Chairman: Joo Ho Kang operators Il Bong Jung (Kyungpook National Univ, Korea) 13:50-14:10 Notes on the Heinz

Lee, Woo Young

269

Matrix shrinkage and swelling can cause profound changes in porosity and permeability of coalbed methane reservoirs during depletion or when under CO{sub 2} injection processes, with significant implication for primary or enhanced methane recovery. Two models that are used to describe these effects are discussed. The first was developed by Advanced Resources International (ARI) and published in 1990 by Sawyer, et al. The second model was published by Palmer and Mansoori in 1996. This paper shows that the two provide equivalent results for most applications. However, their differences in formulation cause each to have relative advantages and disadvantages under certain circumstances. Specifically, the former appears superior for undersaturated coalbed methane reservoirs while the latter would be better if a case is found where matrix swelling is strongly disproportional to gas concentration. Since its presentation in 1996, the Palmer and Mansoori model has justifiably received much critical praise. However, the model developed by ARI for the COMET reservoir simulation program has been in use since 1990, and has significant advantages in certain settings. A review of data published by Levine in 1996 reveals that carbon dioxide causes a greater degree of coal matrix swelling compared to methane, even when measured on a unit of concentration basis. This effect is described in this report as differential swelling. Differential swelling may have important consequences for enhanced coalbed methane and carbon sequestration projects. To handle the effects of differential swelling, an extension to the matrix shrinkage and swelling model used by the COMET simulator is presented and shown to replicate the data of Levine. Preliminary field results from a carbon dioxide injection project are also presented in support of the extended model. The field evidence supports that considerable changes to coal permeability occur with CO{sub 2} injection, with significant implication for the design, implementation and performance of enhanced coalbed methane recovery and CO{sub 2} sequestration projects.

L. J. Pekot; S. R. Reeves

2002-03-31

270

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

NASA Astrophysics Data System (ADS)

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

Cuenin, Jean-Claude

2012-09-01

271

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

Abstract Accelerator driven systems may operate on uranium or thorium free fuels. In order to guarantee, safety parameters of 800 MWth ADS cores operating on oxide and nitride fuels with high americium content.97. For oxide fuels a porosity of 10% was adopted, for nitride fuels 15%. Table 2 displays the average linear

272

Risk and safety analysis for Florida commercial aerial application operations

NASA Astrophysics Data System (ADS)

The purpose of this study was to determine self-reported perceptions in the areas of agroterrorism, bioterrorism, chemical exposure and Federal Aviation Administration (FAA) oversight. The aerial application industry has been in existence since the 1920's with a gamut of issues ranging from pesticide drift to counterterrorism. The attacks of September 11th, 2001, caused a paradigm shift in the way the United States views security and, more importantly, the prevention of malicious activity. Through the proper implementation and dissemination of educational materials dealing with industry specific concerns, it is imperative that everyone has the proper level of resources and training to effectively manage terrorist threats. This research study was designed to interpret how aerial applicators view these topics of concern and how they perceive the current threat level of terrorism in the industry. Research results were consistent, indicating that a high number of aerial applicators in the state of Florida are concerned with these topics. As a result, modifications need to be made with respect to certain variables. The aerial application industry works day in and day out to provide a professional service that helps maintain the integrity of the food and commodities that we need to survive. They are a small percentage of the aviation community that we all owe a great deal for the vital and necessary services they provide.

Robbins, John Michael

273

INSTANTANEOUS ENERGY OPERATORS: APPLICATIONS TO SPEECH PROCESSING AND COMMUNICATIONS

and separation of AM{FM signal mixtures. Finally, we present a cross-coupled ESA for co-channel demodulation numerous applications to demodulating AM and/or FM signals, tracking speech modulations, detect- ing and separation of AM{FM sig- nal mixtures. Finally, we present a cross-coupled ESA for co-channel demodulation. 1

Santhanam, Balu

274

Autonomous Robots in SWAT Applications: Research, Design, and Operations Challenges

This paper describes the efforts of Stanford University's Aerospace Robotics Laboratory (ARL), the Palo Alto - Mountain View (California) Regional Special Weapons and Tactics (SWAT) team, and the MLB Company to bridge the gap between the perception of potential uses of autonomous robots in police SWAT environments and the reality of their application. The ARL researchers were given freedom of

Henry L Jones; Steve Morris

275

Applications of Genetic Methods to NASA Design and Operations Problems

NASA Technical Reports Server (NTRS)

We review four recent NASA-funded applications in which evolutionary/genetic methods are important. In the process we survey: the kinds of problems being solved today with these methods; techniques and tools used; problems encountered; and areas where research is needed. The presentation slides are annotated briefly at the top of each page.

Laird, Philip D.

1996-01-01

276

FIELD APPLICATIONS OF ROBOTIC SYSTEMS IN HAZARDOUS WASTE SITE OPERATIONS

The cleanup of hazardous waste sites is a challenging and complex field that offers numerous opportunities for the application of robotic technology. he contamination problem, long in the making, will take decades to resolve. ur ingenuity in developing robotic tools to assist in ...

277

Options for organization and operation of space applications transfer centers

NASA Technical Reports Server (NTRS)

The benefits of developing regional facilities for transfer of NASA developed technology are discussed. These centers are designed to inform, persuade, and serve users. Included will be equipment for applications and demonstrations of the processes, a library, training facilities, and meeting rooms. The staff will include experts in the various techniques, as well as personnel involved in finding and persuading potential users.

Robinson, A. C.; Madigan, J. A.

1976-01-01

278

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

279

Application of Reactive Barriers Operated in Frozen Ground

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

Damian B. Gore

280

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

281

Application of the effective Fisher matrix to the frequency domain inspiral waveforms

The Fisher matrix (FM) has been generally used to predict the accuracy of the gravitational wave parameter estimation. Although a limitation of the FM has been well known, it is still mainly used due to its very low computational cost compared to the Monte Carlo simulations. Recently, Rodriguez et al. [Phys. Rev. D 88, 084013 (2013)] performed Markov chain Monte Carlo (MCMC) simulations for nonspinning binary systems with total masses $M \\leq 20 M_{\\odot}$, they found systematic differences between the predictions from FM and MCMC for $M>10 M_{\\odot}$. On the other hand, an effective Fisher matrix (eFM) was recently introduced by Cho et al. [Phys. Rev. D 87, 24004 (2013)]. The eFM is a semi-analytic approach to the standard FM, in which the partial derivative is taken by a quadratic fitting function to the local overlap surface. In this work, we apply the eFM method to several nonspinning binary systems and find that the error bounds in eFM are qualitatively in good agreement with the MCMC results of Rodriguez et al. in all mass regions. In particular, we provide concrete examples showing an importance of taking into account the template-dependent frequency cutoff of the inspiral waveforms.

Hee-Suk Cho; Chang-Hwan Lee

2014-11-20

282

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

NASA Technical Reports Server (NTRS)

New manufacturing technologies can now produce uniformly distributed particle strengthened titanium matrix composites (TMCs) at lower cost than many types of continuous-fiber composites. The innovative process results in near-final-shape components having a material stiffness up to 26-percent greater than that of components made with conventional titanium materials. This benefit is achieved with no significant increase in the weight of the component. The improved mechanical performance and low-cost manufacturing capability motivated a review of particulate-reinforced metal composite technology as a way to lower the cost and weight of space-access propulsion systems. Focusing on the elevated-temperature properties of titanium alloy Ti-6Al-4V as the matrix material, researchers at the NASA Glenn Research Center conducted experiments to verify the improved performance of the alloy containing 10 wt% of ceramic titanium carbide (TiC) particles. The appropriate blend of metal and ceramic powder underwent a series of cold and hot isostatic pressing procedures to yield bar stock. A set of round dogbone specimens was manufactured from a small sample of the bars. The TMC material proved to have good machinability at this particle concentration as there was no difficulty in producing high-quality specimens.

Thesken, John C.; Lerch, Bradley A.; Arnold, Steven M.

2003-01-01

283

Optical characterization of biological tissues provides advantages like the non-invasive or non-contact characters, or an increased image resolution. The use of the polarization information, apart from the intensity, leads to new data for a better diagnosis. In this work, we use the Group Theory applied to polarimetry to analyse the polarization behaviour of samples. The SU(4)-O+(6) homomorphism allows us to obtain the Mueller Coherency matrix from the Mueller matrix, and applying the target decomposition theorem, which provides information on tissue structure and separates different polarization effects by means mainly of the eigenvalues and eigenvectors, tissue imaging contrast can be increased. The analysis is applied to glucose suspensions of polystyrene spheres of different concentrations, whose behaviour can be modelled by means of single or multiple scattering depending on the concentration, either in the Rayleigh or Mie regimes. The results could be applied to cell cultures, where cancerous cells grow without control, or even to some anemia pathologies, where the number of erythrocytes in blood decreases. PMID:19964941

Fanjul-Velez, Felix; Ortega-Quijano, Noe; Salas-Garcia, Irene; Arce-Diego, Jose L

2009-01-01

284

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

285

Fabrication of nanocrystallites in the SiOx matrix applicable in microelectronics

NASA Astrophysics Data System (ADS)

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

Kolodziej, Tomasz

2013-07-01

286

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

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

287

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

Code of Federal Regulations, 2011 CFR

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

2011-07-01

288

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

Code of Federal Regulations, 2010 CFR

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

2010-07-01

289

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

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

Cantarella, Jason

290

Workshop on Industrial Applications How is a hidden rule found from operation data?

Workshop on Industrial Applications How is a hidden rule found from operation data? Company: Nippon with mathematicians Expertise Revolution of our thinking (2) Innovation (1) Cost reduction Figure2 Expectation

292

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

Code of Federal Regulations, 2012 CFR

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

2012-07-01

293

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

Code of Federal Regulations, 2013 CFR

2013-07-01

294

Federal Register 2010, 2011, 2012, 2013

...application for the proposed amendment to Renewed Facility Operating License (FOL) No. DPR-59 for the James A. FitzPatrick Nuclear Power Plant, located in Oswego County, New York. The proposed amendment would have modified the Renewed FOL...

2012-01-17

295

7 CFR 56.75 - Applicability of facility and operating requirements.

Code of Federal Regulations, 2010 CFR

...THE AGRICULTURAL MARKETING ACT OF 1946 AND THE EGG PRODUCTS INSPECTION ACT (CONTINUED) VOLUNTARY GRADING OF SHELL EGGS Grading of Shell Eggs Facility Requirements § 56.75 Applicability of facility and operating requirements. The...

2010-01-01

296

NASA Astrophysics Data System (ADS)

This thesis describes the measurement and analysis of the transmission matrix (TM) for microwave radiation propagating through multichannel random waveguides in the crossover to Anderson localization. Eigenvalues of the transmission matrix and the associated eigenchannels are obtained via a singular value decomposition of the TM. The sum of the transmission eigenvalues yields the transmittance T, which is the classical analog of the dimensionless conductance g. The dimensionless conductance g is the electronic conductance in units of the quantum conductance, G/(e2/h). For diffusive waves g > 1, approximately g transmission eigenchannels contribute appreciably to the transmittance T. In contrast, for localized waves with g < 1, T is dominated by the highest transmission eigenvalue, tau 1. For localized waves, the inverse of the localization lengths of different eigenchannels are found to be equally spaced. Measurement of the TM allows us to explore the statistics of the transmittance T. A one-sided log-normal distribution of T is found for a random ensemble with your g = 0.37 and explained using an intuitive Coulomb gas model for the transmission eigenvalues. Single parameter scaling (SPS) predicted for one dimension random system is approached in multichannel systems once T is dominated by a single transmission eigenchannel. In addition to the statistics of the TM for ensembles of random samples, we investigated the statistics of a single TM. The statistics within a large single TM are found to depend upon a single parameter, the eigenchannel participation number, M. The variance of the total transmission normalized by its averaging in the TM is equal to M-1. We found universal fluctuation of M, reminiscent of the well known universal conductance fluctuations for diffusive waves. We demonstrate focusing of steady state and pulse transmission through a random medium via phase conjugation of the TM. The contrast between the focus and the background is determined by M and the size of the transmission matrix N. The spatio-temporal profile of focused radiation in the diffusive limit is shown to be the square of the field-field correlation function in space and time. We determine the density of states (DOS) of a disordered medium from the dynamics of transmission eigenchannels and from the quasi-normal modes of the medium for localized samples. The intensity profile of each eigenchannel within the random media is closely linked to the dynamics of transmission eigenchannels and an analytical expression for intensity profile of each of the eigenchannel based on numerical simulation was provided.

Shi, Zhou

297

The extra-alveolar dry period and storage medium in which the tooth was kept prior to replantation remain the critical factors affecting the survival and regeneration of the damaged periodontium. When the replantation is delayed, replacement root resorption is the most common complication following replantation of an avulsed tooth. The aim of this histological study was to evaluate the periodontal healing of replanted dogs' teeth after 20 min (short) and 60 min (long) extraoral dry time with and without the application of enamel matrix proteins. Eighty mature premolar roots (40 teeth) maxillary and mandibular premolars were extracted, the root canals were accessed, instrumented, and filled using a lateral condensation technique, and the access cavity was restored with amalgam. Each root was randomly assigned to one of experimental groups: Groups I and II: Roots were replanted after an extraoral dry time of 20 min. In group II, Emdogain(®) (Biora, Malmo, Sweden) was applied directly to the external root surface with complete coverage. Groups III and IV: Roots were replanted after an extraoral dry time of 60 min. In group IV, Emdogain(®) was applied to the whole external root surface before replantation. Roots that replanted within a total extraoral dry time of 10 min were used as negative controls, while those replanted after 90 min of extraoral dry time were assigned as positive controls. After 4 months, the dogs were euthanized, and the maxillary and mandibular processes were processed for histology and microscopically evaluated. Statistical analysis showed no significant differences (P = 0.1075) among the experimental groups. The results of this study show that 20 min of extraoral dry time is as detrimental to the PDL cells as 60 or 90 min of extraoral dry time, with avulsed dogs' teeth, even when replanted with an inductive material such as EMD. This study provides strong evidence in relation to the threshold of the extraoral dry time of avulsed teeth, suggesting that the extraoral dry time threshold of PDL cell viability is significantly less than that which current guidelines promote. PMID:25311391

Barbizam, Joao V B; Massarwa, Rasha; da Silva, Lea Assed Bezerra; da Silva, Raquel Assed Bezerra; Nelson-Filho, Paulo; Consolaro, Alberto; Cohenca, Nestor

2015-02-01

298

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

299

Application of the effective Fisher matrix to the frequency domain inspiral waveforms

NASA Astrophysics Data System (ADS)

The Fisher matrix (FM) has been generally used to predict the accuracy of the gravitational wave parameter estimation. Although the limitation of the FM has been well known, it is still mainly used due to its very low computational cost compared to the Monte Carlo simulations. Recently, Rodriguez et al (2013 Phys. Rev. D 88 084013) performed Markov chain Monte Carlo (MCMC) simulations using a frequency domain inspiral waveform model (TaylorF2) for nonspinning binary systems with total masses M?slant 20{{M}? }, and they found systematic differences between the predictions from FM and MCMC for M\\gt 10{{M}? }. On the other hand, an effective Fisher matrix (eFM) was recently introduced by Cho et al (2013 Phys. Rev. D 87 24004). The eFM is a semi-analytic approach to the standard FM, in which the derivative is taken of a quadratic function fitted to the local overlap surface. In this work, we apply the eFM method to the TaylorF2 waveform for nonspinning binary systems with a moderately high signal-to-noise ratio (SNR˜ 15) and find that the eFM can reproduce the MCMC error bounds in Rodriguez et al well, even for high masses. By comparing the eFM standard deviation directly with the 1-? confidence interval of the marginalized overlap that approximates the MCMC posterior distribution, we show that the eFM can be acceptable in all mass regions for the estimation of the MCMC error bounds. We also investigate the dependence on the signal strength.

Cho, Hee-Suk; Lee, Chang-Hwan

2014-12-01

300

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, UniversitÃ© de

301

Operator exposure from closed system loading and application of alachlor herbicide

Biological monitoring (urine) and passive monitoring (patch) techniques were used to estimate total body dose in sixteen operators of closed system transfers of the emulsifiable concentrate (EC) and the micro-encapsulated (MT) formulations of alachlor herbicide from prepackaged bulk containers. Four of the operators were also monitored during the subsequent soil incorporation applications. The dermal deposition was very low and, more

John E. Cowell; Roy G. Danhaus; James L. Kunstman; Amy G. Hackett; Mark E. Oppenhuizen; Jerry R. Steinmetz

1987-01-01

302

The research and application of the operation optimization are very active now, but there are still some problems in this field, for example, the accurate process model is hard to establish for current complex industry process. So they can not instruct operation optimization very well. As more and more real-time data are sent and stored into database, abundantly valuable knowledge

Cheng-Lin Niu; Xi-Ning Yu; Jian-Qiang Li; Wei Sun

2005-01-01

303

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

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

304

Modeling, analysis, and application of buck converters in discontinuous-input-voltage mode operation

By adding a suitable LC filter to the input of a buck power converter, it is possible to force the converter into discontinuous-input-voltage mode operation. A buck power converter in this mode of operation has useful properties such as power factor correction and soft turn-off switching. The operation, modeling, low-frequency behavior, and application of the power converter are studied. Experimental

Y. S. Lee; S. J. Wang; S. Y. R. Hui

1997-01-01

305

Matrix-assisted laser desorption ionization time-of-flight mass spectrometry as a new possibility for rapid identification of bacteria and fungi revolutionized the clinical microbiological diagnostics. It has an extreme importance in the routine microbiological laboratories, as identification of the pathogenic species rapidly will influence antibiotic selection before the final determination of antibiotic resistance of the isolate. The classical methods for identification of bacteria or fungi, based on biochemical tests, are influenced by many environmental factors. The matrix-assisted laser desorption ionization time-of-flight mass spectrometry is a rapid method which is able to identify a great variety of the isolated bacteria and fungi based on the composition of conserved ribosomal proteins. Recently several other applications of the method have also been investigated such as direct identification of pathogens from the positive blood cultures. There are possibilities to identify bacteria from the urine samples in urinary tract infection or from other sterile body fluids. Using selective enrichment broth Salmonella sp from the stool samples can be identified more rapidly, too. The extended spectrum beta-lactamase or carbapenemase production of the isolated bacteria can be also detected by this method helping the antibiotic selection in some cases. Matrix-assisted laser desorption ionization time-of-flight mass spectrometry based methods are suitable to investigate changes in deoxyribonucleic acid or ribonucleic acid, to carry out rapid antibiotic resistance determination or other proteomic analysis. The aim of this paper is to give an overview about present possibilities of using this technique in the clinical microbiological routine procedures. PMID:25217765

Nagy, Erzsébet; Abrók, Marianna; Bartha, Noémi; Bereczki, László; Juhász, Emese; Kardos, Gábor; Kristóf, Katalin; Miszti, Cecilia; Urbán, Edit

2014-09-21

306

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

307

NASA Technical Reports Server (NTRS)

The applicability of operations research, artificial intelligence, and expert systems to logistics problems for the space station were assessed. Promising application areas were identified for space station logistics. A needs assessment is presented and a specific course of action in each area is suggested.

Lippiatt, Thomas F.; Waterman, Donald

1985-01-01

308

The application of system dynamics modelling in strategic decision-making and the analysis of market scenarios has been widely recognized. However, little attention has been placed on the application of system dynamics models to support operational decision-making. This paper presents a simple system dynamics model developed for BMW's production planning department to support decision making on production schedule, -mix and inventory

Listl Andreas; Ingo Notzon

309

Many important problems in pure and applied mathematics and engineering can be reduced to linearalgebra on dense structured matrices. The structure of these dense matrices is understood in the sensethat their n2entries can be "compressed" to a smaller number O(n) of parameters. Operating directly onthese parameters allows one to design efficient fast algorithms for these matrices. One of the most

Vadim Olshevsky; Amin Shokrollahi

2000-01-01

310

Verification of operating software for cooperative monitoring applications

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

311

Monte Carlo applications for the design and operation of nuclear facilities

The computational capabilities of current supercomputers enable the application of rigorous Monte Carlo methods to solve day-to-day neutronics and shielding problems. Experience at Westinghouse Hanford Company has included applications to: reactor operations, decommissioning of a reactor facility, and the design of a space reactor; intermediate energy accelerators; and high-level waste facilities and casks. These practical applications are typically computationally intensive

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

1988-01-01

312

Application of LBB to high energy piping systems in operating PWR

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

313

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

314

Three dimensional scaffolds synthesized using natural or synthetic polymers act as an artificial niche for cell adherence and proliferation. In this study, we have fabricated cryogels employing blend of poly (ethylene glycol) (PEG) and gelatin using two different crosslinkers like, glutaraldehyde and EDC-NHS by cryogelation technique. Synthesized matrices possessed interconnected porous structure in the range of 60-100?m diameter and regained their original length after 90% compression without deformation. Visco-elastic behavior was studied by rheology and unconfined compression analysis, elastic modulus of these cryogels was observed to be >10(5)Pa which showed their elasticity and mechanical strength. TGA and DSC also showed the stability of these cryogels at different temperatures. In vitro degradation capacity was analyzed for 4weeks at 37°C. IMR-32, C2C12 and Cos-7 cells proliferation and ECM secretion on PEG-gelatin cryogels were observed by SEM and fluorescent analysis. In vitro biocompatibility was analyzed by MTT assay for the period of 15days. Furthermore, cell proliferation efficiency, metabolic activity and functionality of IMR-32 cells were analyzed by neurotransmitter assay and DNA quantification. The cell-matrix interaction, elasticity, mechanical strength, stability at different temperatures, biocompatible, degradable nature showed the potentiality of these cryogels towards soft tissue engineering such as neural, cardiac and skin. PMID:25492201

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

2015-02-01

315

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

316

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

317

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

318

Ceramic fibers for matrix composites in high-temperature engine applications

High-temperature engine applications have been limited by the performance of metal alloys and carbide fiber composites at elevated temperatures. Random inorganic networks composed of silicon, boron, nitrogen, and carbon represent a novel class of ceramics with outstanding durability at elevated temperatures. SiBN(3)C was synthesized by pyrolysis of a preceramic N-methylpolyborosilazane made from the single-source precursor Cl(3)Si-NH-BCl(2). The polymer can be processed to a green fiber by melt-spinning, which then undergoes an intermediate curing step and successive pyrolysis. The ceramic fibers, which are presently produced on a semitechnical scale, combine several desired properties relevant for an application in fiber-reinforced ceramic composites: thermal stability, mechanical strength, high-temperature creep resistivity, low density, and stability against oxidation or molten silicon. PMID:10426985

Baldus; Jansen; Sporn

1999-07-30

319

The Spin Density Matrix II: Application to a system of two quantum dots

This work is a sequel to our work "The Spin Density Matrix I: General Theory and Exact Master Equations" (eprint arXiv:0708.0644 [cond-mat]). Here we compare pure- and pseudo-spin dynamics using as an example a system of two quantum dots, a pair of localized conduction-band electrons in an n-doped GaAs semiconductor. Pure-spin dynamics is obtained by tracing out the orbital degrees of freedom, whereas pseudo-spin dynamics retains (as is conventional) an implicit coordinate dependence. We show that magnetic field inhomogeneity and spin-orbit interaction result in a non-unitary evolution in pure-spin dynamics, whereas these interactions contribute to the effective pseudo-spin Hamiltonian via terms that are asymmetric in spin permutations, in particular, the Dzyaloshinskii-Moriya (DM) spin-orbit interaction. We numerically investigate the non-unitary effects in the dynamics of the triplet states population, purity, and Lamb energy shift, as a function of interdot distance and magnetic field difference. The spin-orbit interaction is found to produce effects of roughly four orders of magnitude smaller than those due to magnetic field difference in the pure-spin model. We estimate the spin-orbit interaction magnitude in the DM-interaction term. Our estimate gives a smaller value than that recently obtained by Kavokin [Phys. Rev. B 64, 075305 (2001)], who did not include double occupancy effects. We show that a necessary and sufficient condition for obtaining a universal set of quantum logic gates, involving only two spins, in both pure- and pseudo-spin models is that the magnetic field inhomogeneity and the Heisenberg interaction are both non-vanishing. We also briefly analyze pure-spin dynamics in the electron on liquid helium system recently proposed by Lyon [Phys. Rev. A 74, 052338 (2006)].

Sharif D. Kunikeev; Daniel A. Lidar

2007-09-24

320

NASA Technical Reports Server (NTRS)

Supporting the Aeronautics Research Mission Directorate guidelines, the National Aeronautics and Space Administration [NASA] Dryden Flight Research Center is developing a multidisciplinary design, analysis, and optimization [MDAO] tool. This tool will leverage existing tools and practices, and allow the easy integration and adoption of new state-of-the-art software. Today s modern aircraft designs in transonic speed are a challenging task due to the computation time required for the unsteady aeroelastic analysis using a Computational Fluid Dynamics [CFD] code. Design approaches in this speed regime are mainly based on the manual trial and error. Because of the time required for unsteady CFD computations in time-domain, this will considerably slow down the whole design process. These analyses are usually performed repeatedly to optimize the final design. As a result, there is considerable motivation to be able to perform aeroelastic calculations more quickly and inexpensively. This paper will describe the development of unsteady transonic aeroelastic design methodology for design optimization using reduced modeling method and unsteady aerodynamic approximation. The method requires the unsteady transonic aerodynamics be represented in the frequency or Laplace domain. Dynamically linear assumption is used for creating Aerodynamic Influence Coefficient [AIC] matrices in transonic speed regime. Unsteady CFD computations are needed for the important columns of an AIC matrix which corresponded to the primary modes for the flutter. Order reduction techniques, such as Guyan reduction and improved reduction system, are used to reduce the size of problem transonic flutter can be found by the classic methods, such as Rational function approximation, p-k, p, root-locus etc. Such a methodology could be incorporated into MDAO tool for design optimization at a reasonable computational cost. The proposed technique is verified using the Aerostructures Test Wing 2 actually designed, built, and tested at NASA Dryden Flight Research Center. The results from the full order model and the approximate reduced order model are analyzed and compared.

Pak, Chan-gi; Li, Wesley W.

2009-01-01

321

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.

322

The impact of LDEF results on the space application of metal matrix composites

NASA Technical Reports Server (NTRS)

Over 200 graphite/aluminum and graphite/magnesium composites were flown on the leading and trailing edges of LDEF on the Advanced Composites Experiment. The performance of these composites was evaluated by performing scanning electron microscopy and x-ray photoelectron spectroscopy of exposed surfaces, optical microscopy of cross sections, and on-orbit and postflight thermal expansion measurements. Graphite/aluminum and graphite/magnesium were found to be superior to graphite/polymer matrix composites in that they are inherently resistant to atomic oxygen and are less susceptible to thermal cycling induced microcracking. The surface foils on graphite/aluminum and graphite/magnesium protect the graphite fibers from atomic oxygen and from impact damage from small micrometeoroid or space debris particles. However, the surface foils were found to be susceptible to thermal fatigue cracking arising from contamination embrittlement, surface oxidation, or stress risers. Thus, the experiment reinforced requirements for carefully protecting these composites from prelaunch oxidation or corrosion, avoiding spacecraft contamination, and designing composite structures to minimize stress concentrations. On-orbit strain measurements demonstrated the importance of through-thickness thermal conductivity in composites to minimize thermal distortions arising from thermal gradients. Because of the high thermal conductivity of aluminum, thermal distortions were greatly reduced in the LDEF thermal environment for graphite/aluminum as compared to graphite/magnesium and graphite/polymer composites. The thermal expansion behavior of graphite/aluminum and graphite/magnesium was stabilized by on-orbit thermal cycling in the same manner as observed in laboratory tests.

Steckel, Gary L.; Le, Tuyen D.

1993-01-01

323

This paper describes a user-friendly application tool to assist in the design, operation and maintenance of large buildings/facilities charged with complex/extensive/elaborate activities. The model centers around a specially designed, easy-access data base containing essentially all the relevant information about the facility. Our first test case is the Advanced Neutron Source (ANS) research reactor to be constructed as a center for neutron research.

Shapira, H.B.; Brown, R.A.

1995-12-31

324

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

325

The MJH1 is a very good software tool to use in the analysis of the correctness of various partitioning algorithms. It has the potential to be a forerunner in the discipline of Computer Engineering at North Carolina A and T State University. This is possible because the emulator is easily adaptable to fit system architectures other than SIMD. Through simulation, different architectures can be implemented, as well as various algorithms for exclusive partitioning of matrices to perform simple matrix operations in a parallel or multiprocessor environment. The MJH1 Emulator has the potential to be expanded tremendously. The instruction set could grow immensely. Also, the emulator could be made into a smarter, more-intelligent machine by combining some existing commands and making its language of a higher level.

Martin, H.L.

1987-10-01

326

A Survey of Operating System Support for Real-time Applications

Operating systems ’ (OS) support for applications, which require real-time behavior, are growing in number and diversity. From the desktop to very specialized software/hardware combinations, developers are required to create systems that can satisfy both hard real-time and soft real-time requirements. Since design cycles can be so short, and projects are becoming more diverse in their demands, developers want familiar and robust Application Programmers Interfaces (API), tools, and programming environments to create their real-time applications. The Developers ’ ability to integrate with their familiar tools is important, but popular operating systems do not have equal levels of support for real-time applications. The design of an OS can have a significant impact on its ability to be used in a real-time system. Some operating systems support only soft real-time, others support hard real-time, and some support hard real-time with a few caveats. This survey should help developers understand some of the tradeoffs when picking an OS for system design. We will compare the popular operating system Windows NT/2000, two flavors of Linux (plain Linux and RTLinux), and one less known operating system named sPSOS+. Real-time aspects of the operating systems ' APIs and the underlying implementation that supports those APIs will be discussed.

Dirk Bridwell

327

NSDL National Science Digital Library

The Matrix Market website, provided by the National Institute of Standards and Technology, is "a visual repository of test data for use in comparative studies of algorithms for numerical linear algebra." The repository includes about 500 sparse matrices from a variety of applications, along with matrix generation tools and services. Visitors can scan the top ten or browse the repository by collection, matrix name, or generator name. Search categories include: by matrix properties, by application area, by contributor, and in bibliography. Tools for browsing through the collection are also included. The Welcome page provides additional information on the project, as well as a few reports and technical presentations.

328

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

329

In this study, glucose oxidase and polyphenol oxidase were immobilized in conducting polymer matrices; polypyrrole and poly(N-(4-(3-thienyl methylene)-oxycarbonyl phenyl) maleimide-co-pyrrole) via electrochemical method. Fourier transform infrared and scanning electron microscope were employed to characterize the copolymer of (N-(4-(3-thienyl methylene)-oxycarbonyl phenyl) maleimide) with pyrrole. Kinetic parameters, maximum reaction rate and Michealis-Menten constant, were determined. Effects of temperature and pH were examined for immobilized enzymes. Also, storage and operational stabilities of enzyme electrodes were investigated. Glucose and polyphenol oxidase enzyme electrodes were used for determination of the glucose amount in orange juices and human serum and phenolic amount in red wines, respectively. PMID:17291580

Cil, M; Böyükbayram, A E; Kiralp, S; Toppare, L; Ya?ci, Y

2007-06-01

330

Extracellular matrix (ECM) has been utilized as a biological scaffold for tissue engineering applications in a variety of body systems, due to its bioactivity and biocompatibility. In the current study we developed a modified protocol for the efficient and reproducible derivation of mesenchymal progenitor cells (MPCs) from human embryonic stem cells as well as human induced pluripotent stem cells (hiPSCs) originating from hair follicle keratinocytes (HFKTs). ECM was produced from these MPCs and characterized in comparison to adipose mesenchymal stem cell ECM, demonstrating robust ECM generation by the excised HFKT-iPSC-MPCs. Exploiting the advantages of electrospinning we generated two types of electrospun biodegradable nanofiber layers (NFLs), fabricated from polycaprolactone (PCL) and poly(lactic-co-glycolic acid) (PLGA), which provide mechanical support for cell seeding and ECM generation. Elucidating the optimized decellularization treatment we were able to generate an available "off-the-shelf" implantable product (NFL-ECM). Using rat subcutaneous transplantation model we demonstrate that this stem-cell-derived construct is biocompatible and biodegradable and holds great potential for tissue regeneration applications. PMID:25185111

Shtrichman, Ronit; Zeevi-Levin, Naama; Zaid, Rinat; Barak, Efrat; Fishman, Bettina; Ziskind, Anna; Shulman, Rita; Novak, Atara; Avrahami, Ron; Livne, Erella; Lowenstein, Lior; Zussman, Eyal; Itskovitz-Eldor, Joseph

2014-10-01

331

Matrix diagonalization algorithm and its applicability to the nuclear shell model

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

332

NASA Astrophysics Data System (ADS)

To obtain accurate and reliable estimations of the major lithological properties of the rock within a studied volume, geophysics uses the joint information provided by different geophysical datasets (e.g. gravimetric, magnetic, seismic). Representation of the different types of information entering the problem using probability density functions can provide the mathematical framework to formulate their combination. The maximum likelihood estimator of the resulting joint posterior probability density functions leads to the solution of the problem. However, one key problem appears to limit the use of this solver to an extensive range of real applications: information coming from potential fields that implies the presence of dense matrices in the resolving estimator. It is well known that dense matrix systems rapidly challenge both the algorithms and the computing platforms, and are not suited to high-resolution 3D geophysical analysis. In this study, we propose a procedure that allows us to obtain fast and reliable solutions of the joint posterior probability density functions in the presence of large gravity datasets and using sophisticated model parametrization. As it is particularly CPU-consuming, this 3D problem makes use of parallel computing to improve the performance and the accuracy of the simulations. Analysis of the correctness of the results, and the performance on different parallel environments, shows the portability and the efficiency of the code. This code is applied to a real experiment, where we succeed in recovering a 3D shear-wave velocity and density distribution within the upper mantle of the European continent, satisfying both the seismological and gravity data. On a multiprocessor machine, we have been able to handle forward and inverse calculations with a dense matrix of 215.66 Gb in 18 min, 20 s and 20 min, 54 s, respectively.

Tondi, R.; Cavazzoni, C.; Danecek, P.; Morelli, A.

2012-11-01

333

NASA Astrophysics Data System (ADS)

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

Peller, V. V.

1982-04-01

334

Technology Transfer Automated Retrieval System (TEKTRAN)

An aerial variable-rate application system consisting of a DGPS-based guidance system, automatic flow controller, and hydraulically controlled pump/valve was evaluated for response time to rapidly changing flow requirements and accuracy of application. Spray deposition position error was evaluated ...

335

Cost Metal Matrix Composites for Automotive and other Engineering Applications P. K. Rohatgi Materials. Weiss Eck Industries, 1602 N. 8th Street, Manitowoc, WI 54221-0967 Nikhil Gupta Composite Materials and Mechanics Laboratory, Mechanical, Aerospace and Manufacturing Engineering Department, Polytechnic University

Gupta, Nikhil

336

TER-06-25 SPC-06-72 Application of Matrix Converter to Low-Voltage and Large-Current DC Power to excite the step down transformer from a three-phase utility power source. Computer simulation results. , KeywordsDC power supply, low-voltage and large-current, high-frequency transformer, leakage inductance

Fujimoto, Hiroshi

337

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

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

1996-01-01

338

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

339

NASA Astrophysics Data System (ADS)

Combined studies have been conducted on the structural-phase state and physical-mechanical and tribological properties of nanostructured titanium and zirconium subjected to ion-beam implantation or microplasma oxidation. Low-temperature ion-beam nitriding of the materials examined is shown to provide a 25-35-fold increase in the wear resistance of their surface layers and a 40% decrease in the friction coefficient for tribological interaction with contact surfaces. Microplasma oxidation of titanium in aqueous solution of phosphoric acid, hydroxylapatite and calcium carbonate powders enables calcium-phosphate coatings with high physical-mechanical properties to be produced. Tribological tests in a dry friction regime and in isotonic solution of sodium chloride have revealed that a nanostructured titanium substrate-calcium phosphate coating biocomposite exhibits a fairly high friction coefficient (0.4-1.0) in tribological interactions with ultrahigh molecular-weight polyethylene or bone tissue. A substantial improvement in the tribotechnical properties of nanostructured titanium and zirconium with modified surface layers makes them very promising materials for medical and engineering applications.

Sharkeev, Yu. P.; Kukareko, V. A.; Legostaeva, E. V.; Byeli, A. V.

2011-03-01

340

Analytic system matrix resolution modeling in PET: an application to Rb-82 cardiac imaging

NASA Astrophysics Data System (ADS)

This work explores application of a novel resolution modeling technique based on analytic physical models which individually models the various resolution degrading effects in PET (positron range, photon non-collinearity, inter-crystal scattering and inter-crystal penetration) followed by their combination and incorporation within the image reconstruction task. In addition to phantom studies, the proposed technique was particularly applied to and studied in the task of clinical Rb-82 myocardial perfusion imaging, which presently suffers from poor statistics and resolution properties in the reconstructed images. Overall, the approach is able to produce considerable enhancements in image quality. The reconstructed FWHM for a Discovery RX PET/CT scanner was seen to improve from 5.1 mm to 7.7 mm across the field-of-view (FoV) to ~3.5 mm nearly uniformly across the FoV. Furthermore, extended-source phantom studies indicated clearly improved images in terms of contrast versus noise performance. Using Monte Carlo simulations of clinical Rb-82 imaging, the resolution modeling technique was seen to significantly outperform standard reconstructions qualitatively, and also quantitatively in terms of contrast versus noise (contrast between the myocardium and other organs, as well as between myocardial defects and the left ventricle).

Rahmim, A.; Tang, J.; Lodge, M. A.; Lashkari, S.; Ay, M. R.; Lautamäki, R.; Tsui, B. M. W.; Bengel, F. M.

2008-11-01

341

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

342

In the present study the dermal and the inhalation exposure of five operators during fungicide applications in vineyards were determined. The produced exposure datasets can be used as surrogate for the estimation of the actual and the potential dermal as well as inhalation operator exposure levels for this application scenario. The dermal exposure was measured using the whole body dosimetry method while the inhalation exposure with the use of personal air sampling devices with XAD tubes located on the operator's breathing zone. Ten field trials were carried out by 5 different operators using a tractor assisted hand-held lance with spray gun at the Tanagra region of Viotia, Greece. An in-house GC-ECD analytical method was developed and validated for the determination of penconazole, which was the active substance (a.s.) of the fungicide formulation used in field trials. The mean recovery of field-fortified samples was 81%. The operator exposure results showed expected variability and were compared to those derived from the German model for prediction of operator exposure. The comparison of the 75th percentile values for an operator wearing personal protection equipment has shown that the measured levels were 2.2 times lower than those estimated by the German model. The levels of actual dermal exposure ranged from 2 to 19 mg/kg a.s. applied. The protection provided by the two types of coveralls was evaluated and in comparison to the existing reduction factors used for other types of PPE (coveralls) was found satisfactory for the operator under the conditions of the specific applications. PMID:24140699

Tsakirakis, Angelos N; Kasiotis, Konstantinos M; Charistou, Agathi N; Arapaki, Niki; Tsatsakis, Aristidis; Tsakalof, Andreas; Machera, Kyriaki

2014-02-01

343

Geometry of operator cross ratio

NASA Astrophysics Data System (ADS)

The operator cross ratio, which is meaningful, in particular, for the infinite-dimensional Sato Grassmannian is defined and investigated. Its homological interpretation is presented. A matrix and operator analogue of the Schwartzian differential operator is introduced and its relation to linear Hamiltonian systems and Riccati's equation is established. The aim of these constructions is application to the KP-hierarchy (the Kadomtsev-Petviashvili hierarchy).

Zelikin, M. I.

2006-02-01

344

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

H. Lowery; B. Mitchell

2000-01-01

345

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

346

In previous work, the authors developed an analytical line delay model for analyzing rail line-haul operations, and validated the model as a predictive tool. This paper examines the application of the model as a prescriptive tool for the generation of train schedules. A unique feature of the model is that it incorporates dynamic meet\\/pass priorities in order to approximate an

Susan F. Hallowell; Patrick T. Harker

1998-01-01

347

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

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

348

Operating System Support for Augmented Reality Applications Loris D'Antoni1

digi- tal content on top of the real world. For example, on mobile phones, augmented reality "browsersOperating System Support for Augmented Reality Applications Loris D'Antoni1 , Alan Dunn2 , Suman University of Texas at Austin 3 University of Washington 4 Microsoft Research Abstract Augmented reality (AR

Kohno, Tadayoshi

349

Synchronizing SCADA and Smart Meters operation for advanced smart distribution grid applications

This paper described the coordination of using medium voltage distribution substation SCADA, Smart Meters serving as synchro-sensors and coupled with AMI communication and GIS system for optimizing distribution network operation. Network losses management by improving the system load factor, balancing the system voltage and at the same time combining capacitor bank control and demand response type applications and asset management

Sioe T. Mak; Nader Farah

2012-01-01

350

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

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

351

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

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 deployed by 61 transit agencies as of 1998. Designing and delivering high quality transit service

Bertini, Robert L.

352

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

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

353

An investigation of potential applications of OP-SAPS: Operational Sampled Analog Processors

NASA Technical Reports Server (NTRS)

The application of OP-SAP's (operational sampled analog processors) in pattern recognition system is summarized. Areas investigated include: (1) human face recognition; (2) a high-speed programmable transversal filter system; (3) discrete word (speech) recognition; and (4) a resolution enhancement system.

Parrish, E. A.; Mcvey, E. S.

1977-01-01

354

An Operational Safety and Certification Assessment of a TASAR EFB Application

NASA Technical Reports Server (NTRS)

This paper presents an overview of a Traffic Aware Strategic Aircrew Requests (TASAR) Electronic Flight Bag application intended to inform the pilot of trajectory improvement opportunities while en route that result in operational benefits. The results of safety analyses and a detailed review of Federal Aviation Administration (FAA) regulatory documents that establish certification and operational approval requirements are presented for TASAR. The safety analyses indicate that TASAR has a likely Failure Effects Classification of “No Effect,” and at most, is no worse than “Minor Effect.” Based on this safety assessment and the detailed review of FAA regulatory documents that determine certification and operational approval requirements, this study concludes that TASAR can be implemented in the flight deck as a Type B software application hosted on a Class 2 Portable Electronic Device (PED) Electronic Flight Bag (EFB). This implementation approach would provide a relatively low-cost path to certification and operational approval for both retrofit and forward fit implementation, while at the same time facilitating the business case for early ADS-B IN equipage. A preliminary review by FAA certification and operational approvers of the analyses presented here confirmed that the conclusions are appropriate and that TASAR will be considered a Type B application.

Koczo, Stefan; Wing, David

2013-01-01

355

356

Code of Federal Regulations, 2013 CFR

...RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE INTERIOR PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE MICHIGAN § 922.784 Underground mining permit applications—minimum requirements for reclamation and operation plan....

2013-07-01

357

Surface water monitoring networks play an important role in the stream water quality management. Since a time series of data is obtained from the monitoring network, multivariate statistical techniques can be used to identify important factors or pollution sources of water system. Positive matrix factorization (PMF) is an improved factor analysis tool that has had limited application to water systems. The objective was to apply PMF to monitoring data to apportion water pollution sources in the Daliao River (DLR) basin. The DLR basin includes the Hun and Taizi River catchments in northeast China. This basin is densely populated and heavily industrialized. Fourteen monitoring stations located on the two rivers were used for monitoring 13 physical and chemical parameters from 1990 to 2002. Results show that five sources/processes in the Hun River and four in the Taizi River were identified by marker species and spatial-temporal variations of resolved factors, including point and nonpoint sources for both rivers. In addition, the industrial pollution source emission inventory data were used to compare with the resolved industrial sources. Results reveal that chemical transformations have influenced some chemical species. However, this influence is small compared with observed seasonal variations. Therefore, identification of pollution point and nonpoint sources by their seasonal variations is possible, which will also aid in water quality management. The spatial variation of the industrial pollutants typically corresponded with the urban industrial pollution source inventories. PMID:25655122

Li, Huiying; Hopke, Philip K; Liu, Xiande; Du, Xiaoming; Li, Fasheng

2015-03-01

358

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

359

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

Van Wart, H E; Birkedal-Hansen, H

1990-01-01

360

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

361

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

362

General Purpose Data-Driven Online System Health Monitoring with Applications to Space Operations

NASA Technical Reports Server (NTRS)

Modern space transportation and ground support system designs are becoming increasingly sophisticated and complex. Determining the health state of these systems using traditional parameter limit checking, or model-based or rule-based methods is becoming more difficult as the number of sensors and component interactions grows. Data-driven monitoring techniques have been developed to address these issues by analyzing system operations data to automatically characterize normal system behavior. System health can be monitored by comparing real-time operating data with these nominal characterizations, providing detection of anomalous data signatures indicative of system faults, failures, or precursors of significant failures. The Inductive Monitoring System (IMS) is a general purpose, data-driven system health monitoring software tool that has been successfully applied to several aerospace applications and is under evaluation for anomaly detection in vehicle and ground equipment for next generation launch systems. After an introduction to IMS application development, we discuss these NASA online monitoring applications, including the integration of IMS with complementary model-based and rule-based methods. Although the examples presented in this paper are from space operations applications, IMS is a general-purpose health-monitoring tool that is also applicable to power generation and transmission system monitoring.

Iverson, David L.; Spirkovska, Lilly; Schwabacher, Mark

2010-01-01

363

A hazard and operability study of anhydrous ammonia application in agriculture.

Researchers from the National Institute for Occupational Safety and Health (NIOSH) applied Hazard and Operability (HAZOP) analysis to examine hazards during the use of anhydrous ammonia by farmers. This analysis evaluated the storage, transfer, and application of anhydrous ammonia, identifying credible hazard scenarios, practical solutions, and research needs. Ninety-five findings were developed that are of use to farmers, distributors of ammonia and application equipment, and manufacturers of application equipment. The findings generally involve training, equipment design changes, preventive maintenance, and material compatibilities. The HAZOP team found that additional safety features need to be developed or implemented. The study also pointed out where correct operator procedure and preventive maintenance can prevent inadvertent releases. Other inadvertent releases are caused by incompatible materials, or by using equipment in ways other than intended. Several examples of the findings are given to emphasize the HAZOP technique and the high-risk scenarios. Strategies for dissemination to the agricultural community are presented. PMID:8256691

Spencer, A B; Gressel, M G

1993-11-01

364

A Rapidly Deployable Operational Mesoscale Modeling System for Emergency-Response Applications.

NASA Astrophysics Data System (ADS)

An operational mesoscale model based forecasting system has been developed for use by U.S. Army Test and Evaluation Command meteorologists in their support of test-range operations. This paper reports on the adaptation of this system to permit its rapid deployment in support of a variety of civilian and military emergency-response applications. The innovation that allows for this rapid deployment is an intuitive graphical user interface that permits a non-expert to quickly configure the model for a new application, and launch the forecast system to produce operational products without further intervention. The graphical interface is Web based and can be run on a wireless laptop or a personal digital assistant in the field. The instructions for configuring the modeling system are transmitted to a compute engine [generally a personal computer (PC) cluster], and forecast products are placed on a Web site that can be accessed by emergency responders or other forecast users. This system has been used operationally for predicting the potential transport and dispersion of hazardous material during the 2002 Winter Olympics in Salt Lake City, Utah, and during military operations in Afghanistan. It has also been used operationally to satisfy the rapidly evolving needs of wildfire managers. Continued use of the modeling system by nonexperts will allow developers to refine the graphical interface and make the model and the interface more fault tolerant with respect to the decisions of model users.(The National Center for Atmospheric Research is sponsored by the National Science Foundation

Warner, Thomas T.; Bowers, James F.; Swerdlin, Scott P.; Beitler, Brian A.

2004-05-01

365

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

366

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

367

We consider a singular differential-difference operator ? on the real line which generalizes the Dunkl operator associated with the reflection group Z2 on R. We construct transmutation operators between ? and the first derivative operator d\\/dx. We exploit these transmutation operators, firstly to determine the elementary solution of certain classes of singular differential-difference operators on a product of Euclidean spaces,

Mohamed Ali Mourou

2001-01-01

368

NASA Astrophysics Data System (ADS)

We extend our previous work [S. Sharma and G. K.-L. Chan, J. Chem. Phys. 136, 124121 (2012)], which described a spin-adapted (SU(2) symmetry) density matrix renormalization group algorithm, to additionally utilize general non-Abelian point group symmetries. A key strength of the present formulation is that the requisite tensor operators are not hard-coded for each symmetry group, but are instead generated on the fly using the appropriate Clebsch-Gordan coefficients. This allows our single implementation to easily enable (or disable) any non-Abelian point group symmetry (including SU(2) spin symmetry). We use our implementation to compute the ground state potential energy curve of the C2 dimer in the cc-pVQZ basis set (with a frozen-core), corresponding to a Hilbert space dimension of 1012 many-body states. While our calculated energy lies within the 0.3 mEh error bound of previous initiator full configuration interaction quantum Monte Carlo and correlation energy extrapolation by intrinsic scaling calculations, our estimated residual error is only 0.01 mEh, much more accurate than these previous estimates. Due to the additional efficiency afforded by the algorithm, the excitation energies (Te) of eight lowest lying excited states: a3?u, b 3 ?g - , A1?u, c 3 ?u + , B1?g, B ' 1 ?g + , d3?g, and C1?g are calculated, which agree with experimentally derived values to better than 0.06 eV. In addition, we also compute the potential energy curves of twelve states: the three lowest levels for each of the irreducible representations 1 ?g + , 1 ?u + , 1 ?g - , and 1 ?u - , to an estimated accuracy of 0.1 mEh of the exact result in this basis.

Sharma, Sandeep

2015-01-01

369

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

370

We extend our previous work [S. Sharma and G. K.-L. Chan, J. Chem. Phys. 136, 124121 (2012)], which described a spin-adapted (SU(2) symmetry) density matrix renormalization group algorithm, to additionally utilize general non-Abelian point group symmetries. A key strength of the present formulation is that the requisite tensor operators are not hard-coded for each symmetry group, but are instead generated on the fly using the appropriate Clebsch-Gordan coefficients. This allows our single implementation to easily enable (or disable) any non-Abelian point group symmetry (including SU(2) spin symmetry). We use our implementation to compute the ground state potential energy curve of the C2 dimer in the cc-pVQZ basis set (with a frozen-core), corresponding to a Hilbert space dimension of 10(12) many-body states. While our calculated energy lies within the 0.3 mEh error bound of previous initiator full configuration interaction quantum Monte Carlo and correlation energy extrapolation by intrinsic scaling calculations, our estimated residual error is only 0.01 mEh, much more accurate than these previous estimates. Due to the additional efficiency afforded by the algorithm, the excitation energies (Te) of eight lowest lying excited states: a(3)?u, b(3)?g (-), A(1)?u, c(3)?u (+), B(1)?g, B(') (1)?g (+), d(3)?g, and C(1)?g are calculated, which agree with experimentally derived values to better than 0.06 eV. In addition, we also compute the potential energy curves of twelve states: the three lowest levels for each of the irreducible representations (1)?g (+), (1)?u (+), (1)?g (-), and (1)?u (-), to an estimated accuracy of 0.1 mEh of the exact result in this basis. PMID:25591338

Sharma, Sandeep

2015-01-14

371

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

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

372

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

373

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

374

Using reactor operating experience to improve the design of a new Broad Application Test Reactor

Increasing regulatory demands and effects of plant aging are limiting the operation of existing test reactors. Additionally, these reactors have limited capacities and capabilities for supporting future testing missions. A multidisciplinary team of experts developed sets of preliminary safety requirements, facility user needs, and reactor design concepts for a new Broad Application Test Reactor (BATR). Anticipated missions for the new reactor include fuels and materials irradiation testing, isotope production, space testing, medical research, fusion testing, intense positron research, and transmutation doping. The early BATR design decisions have benefited from operating experiences with existing reactors. This paper discusses these experiences and highlights their significance for the design of a new BATR.

Fletcher, C.D.; Ryskamp, J.M.; Drexler, R.L.; Leyse, C.F.

1993-07-01

375

The application of time-motion study principles to retail flower store operations

'L ICATION OF TIME-MOT I(;N STLiDY PRINCIPLES TO RETAIL FLOEEII STORE OPEIIAT I ONS Bv LEON J ~ TOLLE, JII A THESIS SUBMITTED TO THE GRADUATE SCHOOL OF THE AGR I CULTURAL AND iVECHANI CAL COLLEGE OF TEXAS IN PARTIAL FULFILLMENT OF THE REIIUIREMENT... I ON MADE POSSI BLE CV g THE DETAILS OF THE STUDY ~ &X& Crl THE APPLICATION OF TIME-MOTION STUDY PRINCIPLES TO RETAIL FLOAER STORE OPERATIONS I NTRODVCT ION THE MANASEMENT SOIENcE THE RETAIL fLORIST INDUSTRY THE APPLICATION OF TIME...

Tolle, Leon J., Jr

1952-01-01

376

The Collaborative (formerly the Cooperative) Human Tissue Network (CHTN) is a federally funded service oriented grant that provides high-quality biospecimens and services to the research community. The CHTN consists of six institutions located throughout the United States to assist investigators in obtaining research specimens required for basic research. The CHTN divisions have similar operating goals: however, each division is responsible for maintaining operations at their local institutions. This requires the divisions to identify ways to maintain and sustain operations in a challenging federally funded environment, especially when the number of investigators requesting services drives the operation. Sustainability plans and goals are often times patched together out of necessity rather than taking a thoughtful approach by clearly defining and aligning activities with business strategy and priorities. The CHTN Western Division at Vanderbilt University Medical Center (CHTN-WD) has responded to this challenge of biospecimen resource sustainability in the face of diminished funding by continually identifying ways to innovate our processes through IT enhancements and requiring that the innovation produce measurable and relevant criteria for credibly reporting our operations progress and performance issues. With these overarching goals in mind, CHTN-WD underwent a Lean Six Sigma (LSS) series to identify operational inefficiencies that could be addressed with redesigning workflow and innovating the processes using IT solutions. The result of this internal collaborative innovation process was the implementation of an error-reporting module (ERM) hosted within our biorepository donor IT application, which allowed staff to report errors immediately; determine the operational area responsible; assess the severity of the error; determine course of action; determine if standard operating procedure (SOPs) revisions were required; and through automated e-mails, alert the area personnel responsible. The module provides a data-reporting feature by date range and area of operation for management and analysis. PMID:25496147

Wiles, Kerry R; Washington, M K

2014-12-01

377

A general view of the backscattering Mueller matrix for the quasi-horizontally oriented hexagonal ice crystals of cirrus clouds has been obtained in the case of tilted and scanning lidars. It is shown that the main properties of this matrix are caused by contributions from two qualitatively different components referred to the specular and corner-reflection terms. The numerical calculation of the matrix is worked out in the physical optics approximation. These matrices calculated for two wavelengths and two tilt angles (initial and present) of CALIPSO lidar are presented as a data bank. The depolarization and color ratios for these data have been obtained and discussed. PMID:23263056

Borovoi, Anatoli; Konoshonkin, Alexander; Kustova, Natalia; Okamoto, Hajime

2012-12-17

378

NASA Technical Reports Server (NTRS)

The Trajectory Operations Applications Software Task (TOAST) is a software development project whose purpose is to provide trajectory operation pre-mission and real-time support for the Space Shuttle. The purpose of the evaluation was to evaluate TOAST as an Application Manager - to assess current and planned capabilities, compare capabilities to commercially-available off the shelf (COTS) software, and analyze requirements of MCC and Flight Analysis Design System (FADS) for TOAST implementation. As a major part of the data gathering for the evaluation, interviews were conducted with NASA and contractor personnel. Real-time and flight design users, orbit navigation users, the TOAST developers, and management were interviewed. Code reviews and demonstrations were also held. Each of these interviews was videotaped and transcribed as appropriate. Transcripts were edited and are presented chronologically.

Perkins, Sharon; Martin, Andrea; Bavinger, Bill

1990-01-01

379

Twisted mass QCD for weak matrix elements

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

380

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

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

381

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

382

A method for the quail-quantitative evaluation of pentachlorophenol (PCP) in solid matrixes has been developed. The procedure is based on solid-liquid extraction of solid samples (leather or wood), followed by purification on a cyanopropyl column and determination of the preservative by second derivative UV spectroscopy considering the PCP A peak-through value (304-297 nm). The method allows rapid PCP determination in the concentration range 1-40 micrograms/mL; any matrix interference is avoided by the purification step and recoveries of the preservative were 99.12% (RSD% 0.13) for the leather matrix and 98.03 (RSD% 0.17) for the wood matrix.

Secchieri, M.; Benassi, C.A.; Pastore, S.; Semenzato, A.; Bettero, A.; Levorato, M.; Guerrato, A. (Universita di Padova, Dipartimento di Scienze Farmaceutiche (Italy))

1991-07-01

383

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 l(1)-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

384

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

385

Novel two-layer 4×4 SIW Nolen matrix for multi-beam antenna application in Ku band

A novel two-layer architecture is proposed for a 4times4 Nolen matrix in SIW technology. The matrix employs a newly developed two-layer SIW coupler offering independent control of the transmission phase and the coupling level. Simulated results show very good agreement between calculated and theoretical amplitude and phase output excitation laws with maximum amplitude error of 0.9 dB and 1.6deg phase

Ahmed Ali; Nelson Fonseca; Fabio Coccetti; Hervé Aubert

2009-01-01

386

Novel two-layer broadband 4 × 4 Butler matrix in SIW technology for Ku-band applications

In this paper, the design of a broadband 4x4 Butler matrix is presented for the first time on a two-layer Substrate Integrated Waveguide (SIW) structure. The presence of path crossings in the matrix structure often imposes the use of extra OdB couplers - usually obtained using back to back pairs of 3dB couplers - for planar realizations. Specific designs that

Ahmed Ali; Nelson Fonseca; Fabio Coccetti; Hervé Aubert

2008-01-01

387

NASA Astrophysics Data System (ADS)

We consider an application of the recently developed complex spectral representation of the Liouville operator. The fundamental objects in this formulation are singular distribution functions in classical mechanics and singular density matrices in quantum mechanics. In the domain of these distribution functions the Liouville operator can have complex eigenvalues, corresponding to irreducible spectral representation. We apply this representation to obtain kinetic equations for a one-dimensional classical anharmonic lattice. Existence of these equations represents a rigorous property of the Liouville operator for the lattice. Relation of these equations to the well-known Peierls equation is discussed. The kinetic equation is applied to the problem of the lattice heat conduction. The long time behavior of the heat current correlation function is explicitly evaluated. This result is used to show that the coefficient of heat conductivity diverges in the thermodynamic limit. These results show good agreement with the results of the computer simulations.

Pereverzev, Andrey

388

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.

389

NASA Astrophysics Data System (ADS)

During recent years great attention has been paid to outsourcing as well as to the reverse, insourcing (Dibbern et al., 2004). There has been a strong focus on how the management of software applications and information and communication technology (ICT), expressed as ICT management versus ICT governance, should be carried out (Grembergen, 2004). The maintenance and operation of software applications and ICT use a lot of the resources spent on ICT in organizations today (Bearingpoint, 2004), and managers are asked to increase the business benefits of these investments (Weill & Ross, 2004). That is, they are asked to improve the usage of ICT and to develop new business critical solutions supported by ICT. It also means that investments in ICT and software applications need to be shown to be worthwhile. Basically there are two considerations to take into account with ICT usage: cost reduction and improving business value. How the governance and management of ICT and software applications are organized is important. This means that the improvement of the control of maintenance and operation may be of interest to executives of organizations. It can be stated that usage is dependent on how it is organized. So, if an increase of ICT governance is the same as having well-organized ICT resources, could this be seen as the first step in organizations striving for external provision of ICT? This question is dealt with to some degree in this paper.

Johansson, Björn

390

A computer application system is described which provides nuclear reactor power plant operators with an improved decision support system. This system combines traditional computer applications such as graphics display with artificial intelligence methodologies such as reasoning and diagnosis so as to improve plant operability. This paper discusses the issues, and a solution, involved with the system integration of applications developed using traditional and artificial intelligence languages.

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

1985-01-01

391

Applications of the potential algebras of the two-dimensional Dirac-like operators

NASA Astrophysics Data System (ADS)

Potential algebras can be used effectively in the analysis of the quantum systems. In the article, we focus on the systems described by a separable, 2×2 matrix Hamiltonian of the first order in derivatives. We find integrals of motion of the Hamiltonian that close centrally extended so(3), so(2,1) or oscillator algebra. The algebraic framework is used in construction of physically interesting solvable models described by the (2+1) dimensional Dirac equation. It is applied in description of open-cage fullerenes where the energies and wave functions of low-energy charge-carriers are computed. The potential algebras are also used in construction of shape-invariant, one-dimensional Dirac operators. We show that shape-invariance of the first-order operators is associated with the N=4 nonlinear supersymmetry which is represented by both local and nonlocal supercharges. The relation to the shape-invariant non-relativistic systems is discussed as well.

Jakubský, Vít

2013-04-01

392

NASA Astrophysics Data System (ADS)

In this series, the n-body reduced density matrix (n-RDM) approach for nonorthogonal orbitals and their applications to ab initio valence bond (VB) methods are presented. As the first paper of this series, Hamiltonian matrix elements between internally contracted VB wave functions are explicitly provided by means of nonorthogonal orbital based RDM approach. To this end, a more generalized Wick's theorem, called enhanced Wick's theorem, is presented both in arithmetical and in graphical forms, by which the deduction of expressions for the matrix elements between internally contracted VB wave functions is dramatically simplified, and the matrix elements are finally expressed in terms of tensor contractions of electronic integrals and n-RDMs of the reference VB self-consistent field wave function. A string-based algorithm is developed for the purpose of evaluating n-RDMs in an efficient way. Using the techniques presented in this paper, one is able to develop new methods and efficient algorithms for nonorthogonal orbital based many-electron theory much easier than by use of the first quantized formulism.

Chen, Zhenhua; Chen, Xun; Wu, Wei

2013-04-01

393

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

394

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

395

NASA Astrophysics Data System (ADS)

The variance component estimation (VCE) based on semi-parametric estimator with weighted matrix of data depth has been proposed, because the coupling system model error and gross error exist in the multi-source heterogeneous measurement data of space and ground combined TT&C (Telemetry, Tracking and Command) technology. The uncertain model error has been estimated with the semi-parametric estimator model, and the outlier has been restrained with the weighted matrix of data depth. On the basis of the restriction of the model error and outlier, the VCE can be improved and used to estimate weighted matrix for the observation data with uncertain model error or outlier. Simulation experiment has been carried out under the circumstance of space and ground combined TT&C. The results show that the new VCE based on the model error compensation can determine the rational weight of the multi-source heterogeneous data, and restrain the outlier data.

Pan, X. G.; Wang, J. Q.; Zhou, H. Y.

2013-05-01

396

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

397

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

398

In the photogrammetry field, interest in region detectors, which are widely used in Computer Vision, is quickly increasing due to the availability of new techniques. Images acquired by Mobile Mapping Technology, Oblique Photogrammetric Cameras or Unmanned Aerial Vehicles do not observe normal acquisition conditions. Feature extraction and matching techniques, which are traditionally used in photogrammetry, are usually inefficient for these applications as they are unable to provide reliable results under extreme geometrical conditions (convergent taking geometry, strong affine transformations, etc.) and for bad-textured images. A performance analysis of the SIFT technique in aerial and close-range photogrammetric applications is presented in this paper. The goal is to establish the suitability of the SIFT technique for automatic tie point extraction and approximate DSM (Digital Surface Model) generation. First, the performances of the SIFT operator have been compared with those provided by feature extraction and matching techniques used in photogrammetry. All these techniques have been implemented by the authors and validated on aerial and terrestrial images. Moreover, an auto-adaptive version of the SIFT operator has been developed, in order to improve the performances of the SIFT detector in relation to the texture of the images. The Auto-Adaptive SIFT operator (A2 SIFT) has been validated on several aerial images, with particular attention to large scale aerial images acquired using mini-UAV systems. PMID:22412336

Lingua, Andrea; Marenchino, Davide; Nex, Francesco

2009-01-01

399

Autonomous mobile mesh networks and applications for defense network-centric operations

NASA Astrophysics Data System (ADS)

This paper presents an overview of mobile mesh networking technology and broadband multimedia applications that can support mission-critical operations for network-centric tactical defense operations. Such broadband, autonomous, rapidly deployable, and secure networking and distributed applications provide survivable and reliable means of providing timely information to military forces to gain information superiority and support efficient mission execution. In this paper, first, the communications requirements for such highly dynamic battlefield environments are outlined. This is followed by an overview of the evolution of autonomous mobile mesh networking technology. The technical challenges that need to be addressed for providing broadband multimedia services on such autonomous mobile mesh networks are enumerated and discussed, based on the experience gained in designing and implementing such an integrated system. Finally, as an example, a product designed and implemented for public safety use, is described to highlight the potential of such an integrated solution for defense services. The software-based product comprises an integrated mobile mesh network and a set of distributed multimedia applications that include multicast video, location and tracking, white-boarding, and distributed interactive messaging.

Sastry, Ambatipudi R.

2006-05-01

400

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

401

NASA Astrophysics Data System (ADS)

Graphene nanopores (GNPs) hold great promise as sensors for biological and chemical sensing applications because of their potential in achieving ultra-high sensitivity and sizeable operating currents. However, it remains a challenging task to realize the full potential of GNP sensors in real biological and chemical environment because of strong noise and interference. Here we propose a new GNP based sensor that consists of two conduction units. Due to the opening of additional conductive channels and enhanced transmission pathways around the nanopore, the proposed gapped-GNP structure is shown to operate with significantly improved conductivity and sensitivity over standard GNPs. The proposed device shows promise in dealing with noise and interference observed in practice.

Qiu, Wanzhi; Skafidas, Efstratios

2014-07-01

402

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

403

The Sixth Annual Workshop on Space Operations Applications and Research (SOAR 1992)

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 and held at the JSC Gilruth Recreation Center. The symposium was cosponsored by the Air Force Material Command and by NASA/JSC. Key technical areas covered during the symposium were robotic 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. The symposium's proceedings include papers covering various disciplines presented by experts from NASA, the USAF, universities, and industry.

Krishen, Kumar (editor)

1993-01-01

404

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

405

Transition operators in electromagnetic-wave diffraction theory. II - Applications to optics

NASA Technical Reports Server (NTRS)

The theory developed by Hahne (1992) for the diffraction of time-harmonic electromagnetic waves from fixed obstacles is briefly summarized and extended. Applications of the theory are considered which comprise, first, a spherical harmonic expansion of the so-called radiation impedance operator in the theory, for a spherical surface, and second, a reconsideration of familiar short-wavelength approximation from the new standpoint, including a derivation of the so-called physical optics method on the basis of quasi-planar approximation to the radiation impedance operator, augmented by the method of stationary phase. The latter includes a rederivation of the geometrical optics approximation for the complete Green's function for the electromagnetic field in the presence of a smooth- and a convex-surfaced perfectly electrically conductive obstacle.

Hahne, G. E.

1993-01-01

406

ERIC Educational Resources Information Center

Explains Rom Harre's theory of identity projects. Discusses the educational implications of Harre's model, the 'social reality matrix' (individual identity is dependent on social context), for the teaching of English, foreign language, and mathematics in the lower secondary school curriculum (ages 11-16). (CMK)

Stables, Andrew; Morgan, Carol; Jones, Sonia

1999-01-01

407

A Class of Selenocentric Retrograde Orbits With Innovative Applications to Human Lunar Operations

NASA Technical Reports Server (NTRS)

Selenocentric distant retrograde orbits with radii from approx. 12,500 km to approx. 25,000 km are assessed for stability and for suitability as crewed command and control infrastructure locations in support of telerobotic lunar surface operations and interplanetary human transport. Such orbits enable consistent transits to and from Earth at virtually any time if they are coplanar with the Moon's geocentric orbit. They possess multiple attributes and applications distinct from NASA's proposed destination orbit for a redirected asteroid about 70,000 km from the Moon.

Adamo, Daniel R.; Lester, Daniel F.; Thronson, Harley A.; Barbee, Brent

2014-01-01

408

Designing User Interfaces for Smart-Applications for Operating Rooms and Intensive Care Units

NASA Astrophysics Data System (ADS)

Today’s physicians and nurses working in operating rooms and intensive care units have to deal with an ever increasing amount of data. More and more medical devices are delivering information, which has to be perceived and interpreted in regard to patient status and the necessity to adjust therapy. The combination of high information load and insufficient usability creates a severe challenge for the health personnel with respect to proper monitoring of these devices respective to acknowledging alarms and timely reaction to critical incidents. Smart Applications are a new kind of decision support systems that incorporate medical expertise in order to help health personnel in regard to diagnosis and therapy. By means of a User Centered Design process of two Smart Applications (anaesthesia monitor display, diagnosis display), we illustrate which approach should be followed and which processes and methods have been successfully applied in fostering the design of usable medical devices.

Kindsmüller, Martin Christof; Haar, Maral; Schulz, Hannes; Herczeg, Michael

409

Special Operations Forces (SOF) soldiers must undergo a rigorous selection process that requires high levels of physical fitness and stamina to complete. Physical preparedness is crucial for an applicant's performance during a selection process; preselection physical training programs for SOF applicants must be specific to the demands of the selection process. The purpose of this study was to analyze the physical demands of the Canadian Special Operations Regiment (CSOR) Assessment Center (AC) to develop an evidence-based physical fitness program to assist future applicants to CSOR with their physical preparation. Seventy-one men volunteered to undergo a battery of fitness tests before attending the CSOR AC. Forty-six (mean [SD]: age 26.2 [4.4] years, height 176.5 [7.4] cm, body mass 82.4 [10.1] kg) of the 71 participants further volunteered to participate in the characterization of the physical demands of the AC. Heart rate (HR) data were collected during the physically demanding sessions, and a subsequent task and physiological analysis was conducted to determine key performance variables for exercise prescription. The physically demanding sessions ranged in length from 26.38 (4.24) minutes to 668.52 (30.09) minutes, with the mean HR data ranging from 169.81 (6.64) to 97.51 (6.65) b·min?¹, respectively. Key predictors of completion of the AC were V[Combining Dot Above]O2peak (?exp: 5.92; confidence interval [CI]: 1.1-31.0), and 1-repetition maximum (1RM) squats (?exp: 5.16; CI: 1.2-22.2). The information derived from this study provided the foundation for the design of an evidence-based preparatory training program for future applicants that is reflective of the physical demands of the selection process. PMID:22643138

Carlson, Mark J; Jaenen, Suzanne P

2012-07-01

410

Inversion of second-difference operators with application to infrared astronomy

NASA Astrophysics Data System (ADS)

Ground-based astronomical imaging at thermal-infrared wavelengths requires a differential technique, known as chopping and nodding, to extract the weak astronomical signal from the huge background due to the atmosphere and telescope emission. The resulting image is the second difference of the intensity distribution of the astronomical target, and leads to an image restoration problem that can be formulated as the inversion of a second-difference operator. In general, the problem is affected by a huge non-uniqueness, but the degeneracy is reduced when convenient boundary conditions can be used. In particular, if the target field is surrounded by empty sky, it is natural to require that the solution is zero at the boundary of the image. In this paper we investigate the problem of inverting a second-difference operator with the addition of Dirichlet boundary conditions. We show that the related discrete problem can be reduced to the inversion of a non-singular positive definite matrix whose eigenvalues and eigenvectors can be explicitly given. We also give an inversion formula and we investigate the numerical stability of the solution. Since in most practical situations the inversion problem is ill-conditioned, we give a reformulation as a least-squares problem. The advantage is that it is possible to introduce additional constraints such as the non-negativity of the solution. Moreover, we introduce an iterative algorithm converging to the unique non-negative least-squares solution. Since the latter can be still affected by numerical instability, we show that early stopping of the iterations has a regularization effect. We conclude with a discussion of the observational implications of our analysis.

Bertero, M.; Boccacci, P.; Robberto, M.

2003-12-01

411

14 CFR Appendix A to Part 129 - Application for Operations Specifications by Foreign Air Carriers

Code of Federal Regulations, 2010 CFR

...for Operations Specifications by Foreign Air Carriers A Appendix A to Part 129 ...DEPARTMENT OF TRANSPORTATION (CONTINUED) AIR CARRIERS AND OPERATORS FOR COMPENSATION...CERTIFICATION AND OPERATIONS OPERATIONS: FOREIGN AIR CARRIERS AND FOREIGN OPERATORS OF...

2010-01-01

412

Code of Federal Regulations, 2013 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)...

2013-04-01

413

Code of Federal Regulations, 2012 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)...

2012-04-01

414

415

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

416

417

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

418

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

419

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

420

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...

2012-07-01

421

422

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

423

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

424

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

425

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

426

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 RHODE...

2010-07-01

427

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 OREGON...

2013-07-01

428

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 IDAHO...

2012-07-01

429

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

430

431

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

432

Code of Federal Regulations, 2012 CFR

...2012-07-01 2012-07-01 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...

2012-07-01

433

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 OREGON...

2010-07-01

434

435

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

436

Code of Federal Regulations, 2011 CFR

...2011-07-01 2011-07-01 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...

2011-07-01

437

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

438

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

439

440

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 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...

2010-07-01

441

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

442

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

443

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

444

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...

2010-07-01

445

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

446

447

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

448

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

449

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...

2010-07-01

450

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...

2010-07-01

451

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

452

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...

2010-07-01

453

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...

2012-07-01

454

455

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

456

Code of Federal Regulations, 2011 CFR

...2011-07-01 2011-07-01 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 NORTH...

2011-07-01

457

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

458

459

460

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 SOUTH...

2010-07-01

461

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

462

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

463

464

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...

2010-07-01

465

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

466

NASA Astrophysics Data System (ADS)

More than 45000 large dams have been constructed all over the world, and their total storage capacity exceeds 7000 km3 which corresponds to approximately 20% of the total annual global river discharge. Explicit incorporation of reservoir operation is indispensable for global-/macro-scale hydrological models, since their storage capacity and potential of altering flow regime are too large to neglect. Our presentation consists of three parts. In the first part, the H08 model, a global hydrological model with reservoir operation scheme is introduced. The H08 model includes an algorithm to estimate reservoir operating rules of individual reservoirs. This enables us to apply the model to the regions and periods with no recorded reservoir operation. The key concepts and challenges of the model are discussed. In the second part, the role of reservoirs in water scarcity is globally assessed. In many parts of the world, local people are suffered from temporal variability in precipitation and river flow. The contribution of reservoirs to water scarcity alleviation is quantitatively and globally assessed. The assessment is extended to the future periods utilizing the latest climate and socio-economic scenarios. In the last part, a regional model application is introduced. The Chao Phraya River in Thailand was suffered fro