NSDL National Science Digital Library
Blake, Lewis
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.
Matrix product operator representations
V. Murg; J. I. Cirac; B. Pirvu; F. Verstraete
2008-04-24
We show how to construct relevant families of matrix product operators in one and higher dimensions. Those form the building blocks for the numerical simulation methods based on matrix product states and projected entangled pair states. In particular, we construct translational invariant matrix product operators suitable for time evolution, and show how such descriptions are possible for Hamiltonians with long-range interactions. We illustrate how those tools can be exploited for constructing new algorithms for simulating quantum spin systems.
Matrix-free application of Hamiltonian operators in Coifman wavelet bases
NASA Astrophysics Data System (ADS)
Acevedo, Ramiro; Lombardini, Richard; Johnson, Bruce R.
2010-06-01
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.
Computational Improvements to Matrix Operations
Gordon Chalmers
2006-01-18
An alternative to the matrix inverse procedure is presented. Given a bit register which is arbitrarily large, the matrix inverse to an arbitrarily large matrix can be peformed in ${\\cal O}(N^2)$ operations, and to matrix multiplication on a vector in ${\\cal O}(N)$. This is in contrast to the usual ${\\cal O}(N^3)$ and ${\\cal O}(N^2)$. A finite size bit register can lead to speeds up of an order of magnitude in large matrices such as $500\\times 500$. The FFT can be improved from ${\\cal O}(N\\ln N)$ to ${\\cal O}(N)$ steps, or even fewer steps in a modified butterfly configuration.
LAB ASSIGNMENT -6 MATRIX OPERATIONS IN EXCEL
Clement, Prabhakar
1 LAB ASSIGNMENT -6 MATRIX OPERATIONS IN EXCEL 8.1 ARRAYS IN EXCEL: Excel uses arrays to store the arrays for matrix operations in Excel but this helps in keeping the spreadsheet organized and easy described above. Figure 8.2 Matrix addition using array math in excel In the above example, A and B are both
Learned fusion operators based on matrix completion
NASA Astrophysics Data System (ADS)
Risko, Kelly K. D.; Hester, Charles F.
2011-05-01
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.
Characterizing Topological Order with Matrix Product Operators
Mehmet Burak ?ahino?lu; Dominic Williamson; Nick Bultinck; Michael Mariën; Jutho Haegeman; Norbert Schuch; Frank Verstraete
2014-09-07
One of the most striking features of quantum phases that exhibit topological order is the presence of long range entanglement that cannot be detected by any local order parameter. The formalism of projected entangled-pair states is a natural framework for the parameterization of the corresponding ground state wavefunctions, in which the full wavefunction is encoded in terms of local tensors. Topological order is reflected in the symmetries of these tensors, and we give a characterization of those symmetries in terms of matrix product operators acting on the virtual level. This leads to a set of algebraic rules characterizing states with topological quantum order. The corresponding matrix product operators fully encode all topological features of the theory, and provide a systematic way of constructing topological states. We generalize the conditions of $\\mathsf{G}$ and twisted injectivity to the matrix product operator case, and provide a complete picture of the ground state manifold on the torus. As an example, we show how all string-net models of Levin and Wen fit within this formalism, and in doing so provide a particularly intuitive interpretation of the pentagon equation for F-symbols as the pulling of certain matrix product operators through the string-net tensor network. Our approach paves the way to finding novel topological phases beyond string-nets, and elucidates the description of topological phases in terms of entanglement Hamiltonians and edge theories.
Matrix representation of the time operator
NASA Astrophysics Data System (ADS)
Bender, Carl M.; Gianfreda, Mariagiovanna
2012-06-01
In quantum mechanics the time operator ? satisfies the commutation relation [?, H] = i, and thus it may be thought of as being formally canonically conjugate to the Hamiltonian H. The time operator associated with a given Hamiltonian H is not unique because one can replace ? by ? + ?hom, where ?hom satisfies the homogeneous condition [?hom, H] = 0. To study this nonuniqueness the matrix elements of ? for the harmonic-oscillator Hamiltonian are calculated in the eigenstate basis. This calculation requires the summation of divergent series, and the summation is accomplished by using zeta-summation techniques. It is shown that by including appropriate homogeneous contributions, the matrix elements of ? simplify dramatically. However, it is still not clear whether there is an optimally simple representation of the time operator.
Matrix models from operators and topological strings
Marino, Marcos
2015-01-01
We propose a new family of matrix models whose $1/N$ expansion captures the all-genus topological string on toric Calabi-Yau threefolds. These matrix models are constructed from the trace class operators appearing in the quantization of the corresponding mirror curves. The fact that they provide a non-perturbative realization of the (standard) topological string follows from a recent conjecture connecting the spectral properties of these operators, to the enumerative invariants of the underlying Calabi-Yau threefolds. We study in detail the resulting matrix models for some simple geometries, like local $\\mathbb P^2$ and local $\\mathbb F_2$, and we verify that their weak 't Hooft coupling expansion reproduces the topological string free energies near the conifold singularity. These matrix models are formally similar to those appearing in the Fermi-gas formulation of Chern-Simons-matter theories, and their $1/N$ expansion receives non-perturbative corrections determined by the Nekrasov-Shatashvili limit of the ...
Matrix models from operators and topological strings
Marcos Marino; Szabolcs Zakany
2015-06-23
We propose a new family of matrix models whose 1/N expansion captures the all-genus topological string on toric Calabi-Yau threefolds. These matrix models are constructed from the trace class operators appearing in the quantization of the corresponding mirror curves. The fact that they provide a non-perturbative realization of the (standard) topological string follows from a recent conjecture connecting the spectral properties of these operators, to the enumerative invariants of the underlying Calabi-Yau threefolds. We study in detail the resulting matrix models for some simple geometries, like local P^2 and local F_2, and we verify that their weak 't Hooft coupling expansion reproduces the topological string free energies near the conifold singularity. These matrix models are formally similar to those appearing in the Fermi-gas formulation of Chern-Simons-matter theories, and their 1/N expansion receives non-perturbative corrections determined by the Nekrasov-Shatashvili limit of the refined topological string.
Operational Models Matrix: Characteristics of Operational NWP Models
NSDL National Science Digital Library
2014-09-14
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).
Matrix operators for complex interferometer analysis
Dahlgren, Robert P
2010-01-01
A modeling methodology and matrix formalism is presented that permits analysis of arbitrarily complex interferometric waveguide systems, including polarization and backreflection effects. Considerable improvement results from separation of the dependencies on connection topology from the dependencies on the devices and their specifications. A non-commutative operator and embedding matrices are introduced allowing a compact depiction of the salient optical equations, and straightforward calculation of the amplitude and intensity transfer functions.
Matrix operators for complex interferometer analysis
Robert P. Dahlgren
2011-02-05
A modeling methodology and matrix formalism is presented that permits analysis of arbitrarily complex interferometric waveguide systems, including polarization and backreflection effects. Considerable improvement results from separation of the dependencies on connection topology from the dependencies on the devices and their specifications. A non-commutative operator and embedding matrices are introduced allowing a compact depiction of the salient optical equations, and straightforward calculation of the amplitude and intensity transfer functions.
THE MATRIX CUBE PROBLEM: Approximations and Applications
Nemirovski, Arkadi
THE MATRIX CUBE PROBLEM: Approximations and Applications Arkadi Nemirovski, Stieltjes Visiting with A. Ben-Tal 1. Matrix Cube · The problem: formulation and moti- vation · Main result · Back to applications · Sketch of the proof 2. From Matrix Cube to Computing Ma- trix Norms · The problem · Main result
NASA Astrophysics Data System (ADS)
Doppler, Lionel; Carbajal-Henken, Cintia; Pelon, Jacques; Ravetta, François; Fischer, Jürgen
2014-09-01
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).
Matrix-Vector and Matrix-Matrix Operations Prototype name: FLA_XXYY
Batory, Don
or op( A ) on the left or on the right of B ) Constants (can be used for parameters alpha or beta) -1-VECTOR OPERATIONS FLA_Dot ( x, y, delta ) xT y FLA_Dot_x ( alpha, x, y, beta, delta ) xT y + FLA_Nrm2 ( x | ) MATRIX-VECTOR OPERATIONS FLA_Gemv ( trans, alpha, A, x, beta, y ) y A x + y, y AT x + y, y AH x + y
Extended matrix pencils for the delta-operator Riccati equation
R. Scott Erwin; Dennis S. Bernstein
1998-01-01
This paper has introduced an extended matrix pencil problem associated with the solution of the delta-operator (difference operator) algebraic Riccati equation. The result is integrated into a systematic treatment of solution algorithms for differential, shift, and difference operator algebraic Riccati equations. These algorithms included the standard eigenvalue problem for ?-Hamiltonian matrices, a generalized eigenvalue problems for an associated matrix pencil,
Organizing matrices and matrix operations for paged memory systems
A. C. McKellar; Edward G. Coffman Jr.
1969-01-01
Matrix representations and operations are examined for the purpose of minimizing the page faulting occurring in a paged memory system. It is shown that carefully designed matrix algorithms can lead to enormous savings in the number of page faults occurring when only a small part of the total matrix can be in main memory at one time. Examination of addition,
Phase matrix induced symmetrics for multiple scattering using the matrix operator method
NASA Technical Reports Server (NTRS)
Hitzfelder, S. J.; Kattawar, G. W.
1973-01-01
Entirely rigorous proofs of the symmetries induced by the phase matrix into the reflection and transmission operators used in the matrix operator theory are given. Results are obtained for multiple scattering in both homogeneous and inhomogeneous atmospheres. These results will be useful to researchers using the method since large savings in computer time and storage are obtainable.
Nonnegative Matrix Approximation: Algorithms and Applications
Suvrit Sra; Inderjit S. Dhillon
Low dimensional data representations are crucial to numerous applications in machine learning, statis- tics, and signal processing. Nonnegative matrix approximation (NNMA) is a method for dimensionality reduction that respects the nonnegativity of the input data while constructin g a low-dimensional approx- imation. NNMA has been used in a multitude of applications, though without commensurate theoretical development. In this report we
Airspace Operations Demo Functional Requirements Matrix
NASA Technical Reports Server (NTRS)
2005-01-01
The Flight IPT assessed the reasonableness of demonstrating each of the Access 5 Step 1 functional requirements. The functional requirements listed in this matrix are from the September 2005 release of the Access 5 Functional Requirements Document. The demonstration mission considered was a notional Western US mission (WUS). The conclusion of the assessment is that 90% of the Access 5 Step 1 functional requirements can be demonstrated using the notional Western US mission.
Andrey V. Sokolov
2014-07-19
We study intertwining relations for $n\\times n$ matrix non-Hermitian, in general, one-dimensional Hamiltonians by $n\\times n$ matrix linear differential operators with nondegenerate coefficients at $d/dx$ in the highest degree. Some methods of constructing of $n\\times n$ matrix intertwining operator of the first order of general form are proposed and their interrelation is examined. As example we construct $2\\times2$ matrix Hamiltonian of general form intertwined by operator of the first order with the Hamiltonian with zero matrix potential. It is shown that one can add for the final $2\\times2$ matrix Hamiltonian with respect to the initial matrix Hamiltonian with the help of intertwining operator of the first order either up to two bound states for different energy values or up to two bound states described by vector-eigenfunctions for the same energy value or up to two bound states described by vector-eigenfunction and associated vector-function for the same energy value.
Matrix product operators and states: NP-hardness and undecidability
M. Kliesch; D. Gross; J. Eisert
2014-11-26
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 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.
Crystal Frameworks, Matrix-valued Functions and Rigidity Operators
Power, S C
2011-01-01
An introduction and survey is given of some recent work on the infinitesimal dynamics of \\textit{crystal frameworks}, that is, of translationally periodic discrete bond-node structures in $\\mathbb{R}^d$, for $ d=2,3,...$. We discuss the rigidity matrix, a fundamental object from finite bar-joint framework theory, rigidity operators, matrix-function representations and low energy phonons. These phonons in material crystals, such as quartz and zeolites, are known as rigid unit modes, or RUMs, and are associated with the relative motions of rigid units, such as ~SiO$_4$ tetrahedra in the tetrahedral polyhedral bond-node model for quartz. We also introduce semi-infinite crystal frameworks, bi-crystal frameworks and associated multi-variable Toeplitz operators.
Sharp Estimates in Ruelle Theorems for Matrix Transfer Operators
NASA Astrophysics Data System (ADS)
Campbell, J.; Latushkin, Y.
A matrix coefficient transfer operator , on the space of -sections of an m-dimensional vector bundle over n-dimensional compact manifold is considered. The spectral radius of is estimated bya; and the essential spectral radius by
Matrix product operators for symmetry-protected topological phases
Dominic J. Williamson; Nick Bultinck; Michael Mariën; Mehmet B. Sahinoglu; Jutho Haegeman; Frank Verstraete
2014-12-17
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.
Handbook Article on Applications of Random Matrix Theory to QCD
J. J. M. Verbaarschot
2009-10-21
In this chapter of the Oxford Handbook of Random Matrix Theory we introduce chiral Random Matrix Theories with the global symmetries of QCD. In the microscopic domain, these theories reproduce the mass and chemical potential dependence of QCD. The main focus of this chapter is on the spectral properties of the QCD Dirac operator and relations between chiral Random Matrix Theories and chiral Lagrangians. Both spectra of the anti-hermitian Dirac operator and spectra of the nonhermitian Dirac operator at nonzero chemical potential are discussed.
Light-ray operators and their application in QCD
Geyer, B.; Robaschik, D. [Leipzig Univ. (Germany). Fachbereich Physik; Mueller, D. [Stanford Linear Accelerator Center, Menlo Park, CA (United States)
1994-05-01
The nonperturbative parton distribution and wave functions are directly related to matrix elements of light-ray (nonlocal) operators. These operators are generalizations of the standard local operators known from the operator product expansions. The renormalization group equation for these operators leads to evolution equations for more general distribution amplitudes which include the Altarelli-Parisi and the Brodsky-Lepage equations as special cases. It is possible to derive the Altarelli-Parisi kernel as a limiting case of the extended Brodsky-Lepage kernel. As a new application of the operator product expansion, the virtual Compton scattering near forward direction is considered.
Thermal evolution of the Schwinger model with Matrix Product Operators
M. C. Bañuls; K. Cichy; J. I. Cirac; K. Jansen; H. Saito
2015-05-01
We demonstrate the suitability of tensor network techniques for describing the thermal evolution of lattice gauge theories. As a benchmark case, we have studied the temperature dependence of the chiral condensate in the Schwinger model, using matrix product operators to approximate the thermal equilibrium states for finite system sizes with non-zero lattice spacings. We show how these techniques allow for reliable extrapolations in bond dimension, step width, system size and lattice spacing, and for a systematic estimation and control of all error sources involved in the calculation. The reached values of the lattice spacing are small enough to capture the most challenging region of high temperatures and the final results are consistent with the analytical prediction by Sachs and Wipf over a broad temperature range.
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
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)
Eichenberger, Alexandre E; Gschwind, Michael K; Gunnels, John A
2013-11-05
Mechanisms for performing matrix multiplication operations with data pre-conditioning in a high performance computing architecture are provided. A vector load operation is performed to load a first vector operand of the matrix multiplication operation to a first target vector register. A load and splat operation is performed to load an element of a second vector operand and replicating the element to each of a plurality of elements of a second target vector register. A 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 matrix multiplication operation. The partial product of the matrix multiplication operation is accumulated with other partial products of the matrix multiplication operation.
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
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.
NASA Astrophysics Data System (ADS)
Gürvit, Ercan; Baykara, N. A.; Demiralp, Metin
2012-12-01
In this work an experimental study on finite dimensional matrix approximations to products of various operators under a basis set orthonormalized on a finite interval is conducted. The elements of the matrices corresponding to the matrix representation of various operators, are calculated based on various term recursive relations. It is shown that higher the values of n, lower the relative marginal change will be obtained from the norm of the difference of the matrix representation of a product of two operators and the product of the matrix representations of the same operators.
Matrix elements of one-body and two-body operators between arbitrary HFB multi-quasiparticle states
Qing-Li Hu; Zao-Chun Gao; Y. S. Chen
2014-08-14
We present new formulae for the matrix elements of one-body and two-body physical operators in compact forms, which are applicable to arbitrary Hartree-Fock-Bogoliubov wave functions, including those for multi-quasiparticle excitations. The test calculations show that our formulae may substantially accelerate the process of symmetry restoration when applied to the heavy nuclear system.
Direct-Power-Control Based Matrix Converter and Its Operation Characteristics
Fujimoto, Hiroshi
SPC06103 IEA0626 Direct-Power-Control Based Matrix Converter and Its Operation) This paper proposes a novel control strategy of a matrix converter, which features direct instantaneous/DC/AC (matrix converter, virtual AC/DC/AC power conversion, direct power control, switching state table
Murty, Katta G.
2013-01-01
Algorithmic Operations Research Vol.7 (2013) 5154 Fast Descent Methods for LPs With No Matrix. Key words: Linear Programming (LP), Interior point methods (IPMs) , solving LPs by descent methods to develop fast algorithms for LP without using matrix inversion operations. SMs consider LPs in the form
The stochastic operator approach to random matrix theory
Sutton, Brian D. (Brian David)
2005-01-01
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 ...
Random Matrix Theory, Numerical Computation and Applications
Edelman, Alan
(n) models (2.3) Time: O(n3 ) O(n2 ) Max eig Tracy-Widom Law A=randn(n) k=round(n-10*n^(1/3)-1) Truncated vs and Bidiagonal models (Section 2) Theories Stochastic Operators (Section 3) Inspired by Computation Sturm (AH + A)/2 n to get the semicircle law. The Tracy-Widom distribution (illustrated in Algorithm 1
VML 3.0 Reactive Sequencing Objects and Matrix Math Operations for Attitude Profiling
NASA Technical Reports Server (NTRS)
Grasso, Christopher A.; Riedel, Joseph E.
2012-01-01
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.
J. Bartolomei; M. Cokus; J. Dahlgren; J. Wilds
The structure of this paper consists of three parts. Part 1 discusses three different, yet related, modeling frameworks: DSMs, DSM\\/DMMs, and ESMs. Part 2 examines the existing analysis techniques as applied to the different modeling frameworks. It also includes additional potential analysis techniques proposed for application to the three modeling frameworks. Part 3 provides a more detailed discussion of the
Symbolic matrix inversion with application to electronic circuits
KAI S. YEUNG; FIKRU KUMBI
1988-01-01
The problem of inverting matrices that contain as entries polynomials in several variables is considered. A method of inversion based on the multidimensional discrete Fourier transform of matrix sequences is developed. The method is particularly effective for a moderate number of symbolic variables. An example is given to illustrate its application to an electron amplifier
A new matrix converter-motor (MCM) for industry applications
Christian Klumpner; Peter Nielsen; Ion Boldea; Frede Blaabjerg
2000-01-01
The trend in electrical drives is to integrate the frequency converter, the electrical motor and even the gear or the pump into a single unit, in order to reduce the costs and to increase the overall efficiency and the equipment reliability. This paper presents the first integrated regenerative frequency converter-motor for industry applications, based on a matrix converter topology. The
A new matrix converter motor (MCM) for industry applications
Christian Klumpner; Peter Nielsen; Ion Boldea; Frede Blaabjerg
2002-01-01
The trend in electrical drives is to integrate the frequency converter, the electrical motor, and even the gear or the pump into a single unit, in order to reduce the costs, to increase the overall efficiency and the equipment reliability. This paper presents the first integrated regenerative frequency converter motor for industry applications, based on a matrix converter topology. The
Matrix operator approach to the quantum evolution operator and the geometric phase
NASA Astrophysics Data System (ADS)
Kim, Sang Pyo; Kim, Jewan; Soh, Kwang Sup
2013-11-01
The Moody-Shapere-Wilczek's adiabatic effective Hamiltonian and Lagrangian method is developed further into the matrix effective Hamiltonian (MEH) and Lagrangian (MEL) approach to a parameter-dependent quantum system. The matrix-operator approach formulated in the product integral (PI) provides not only a method to find the wave function efficiently in the MEH approach but also higher order corrections to the effective action systematically in the MEL approach, a la the Magnus expansion and the Kubo cumulant expansion. A coupled quantum system of a light particle of a harmonic oscillator is worked out, and as a by-product, a new kind of gauge potential (Berry's connection) is found even for nondegenerate cases (real eigenfunctions). Moreover, in the PI formulation the holonomy of the induced gauge potential is related to Schlesinger's exact formula for the gauge field tensor. A superadiabatic expansion is also constructed, and a generalized Dykhne formula, depending on the contour integrals of the homotopy class of complex degenerate points, is rephrased in the PI formulation.
Using Excel's Matrix Operations to Facilitate Reciprocal Cost Allocations
ERIC Educational Resources Information Center
Leese, Wallace R.; Kizirian, Tim
2009-01-01
The reciprocal method of service department cost allocation requires linear equations to be solved simultaneously. These computations are often so complex as to cause the abandonment of the reciprocal method in favor of the less sophisticated direct or step-down methods. Here is a short example demonstrating how Excel's sometimes unknown matrix…
The genetic matrix of Mayan applicative acquisition
Pye, Clifton
2007-07-01
Groups Child Measure 2;0 2;6 3;0 3;6 Al Tiyaan Age 2;1 2;7 2;10 MLU 1.3 2.1 2.8 No. of Utts. 1811 844 1026 Al Chaay Age 2;9 3;0 3;6 MLU 1.6 2.7 3.5 No. of Utts. 945 2356 1770 A Carlos Age 3;1 3;4 3;8 MLU 1.8 2.8 3.3 No. of Utts. 735 3032 1508 The genetic... addressee 1 (25) Tzeltal children’s use of the applicative su‰x -b’e (derived from Brown, in press) Lus 2;0 2;6 3;0 3;6 dative 1/3 dative 1/6 dative 1/13 dative 1/13 benefactive 4 benefactive 4 benefactive 4 benefactive 4 malefactive 1 malefactive 1...
Properties and applications of transversal operators
Daniel J. Greenhoe
2014-10-20
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.
Matrix operations over integral domains using nested APL
Robert G. Willhoft
1992-01-01
This paper deals with the use of APL to solve matrix theory problems with elements that are members of an integral domain. Two types of integral domains are used to illustrate the methods developed in this paper, integers (Z) and polynomials with real coefficients (Re[X]). However, the method of approach can be easily generalized to include other integral domains.APL2, due
Sparse unitary operators and repeated entries in the process matrix
Vinayak Jagadish; Anil Shaji
2015-06-12
We show that quantum processes of low rank are inexorably connected to the dimensions of the environmental state space that the system is in contact with. We also show that the process matrix representing such low rank processes will have only a few distinct entries which goes as O(r^2) (r is the rank) and hence the number of independent measurements needed to characterize the process is greatly reduced.
Matrix Elements and Operator Equivalents Connected with the Magnetic Properties of Rare Earth Ions
K W H Stevens; K. W. H
1952-01-01
An account is given of the methods used to determine the matrix elements of crystal field potentials with particular reference to rare earth ions. Emphasis is laid on the importance of Wigner coefficients in such problems and the idea of using equivalent angular momentum operators is developed. For convenience in applying the results tables of matrix elements are included.
NASA Astrophysics Data System (ADS)
Boito, D.; Catà, O.; Golterman, M.; Jamin, M.; Maltman, K.; Osborne, J.; Peris, S.
2012-09-01
We discuss a preliminary study of the impact of duality violations on extractions from ? decay data of the D = 6 VEVs which determine chiral limit Standard Model K ??? matrix elements of the electroweak penguin operators.
Evaluating Two-Loop massive Operator Matrix Elements with Mellin-Barnes Integrals
I. Bierenbaum; J. Blümlein; S. Klein
2006-07-27
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.
Eichenberger, Alexandre E; Gschwind, Michael K; Gunnels, John A
2014-02-11
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.
A novel SiC JFET gate drive circuit for sparse matrix converter applications
Marcelo L. Heldwein; Johann W. Kolar
2004-01-01
Three-phase AC\\/AC sparse matrix converters (SMC) show a low realization effort and a low control complexity and are therefore of potential interest for industry applications. In this paper a novel gate drive circuit for a SiC J-FETs to be employed in an AII-SiC-SMC is proposed. The gate drive requirements of SiC J-FETs are clarified and the operating principle of the
Fuzzy Geometry via the Spinor Bundle, with Applications to Holographic Space-time and Matrix Theory
Tom Banks; John Kehayias
2011-11-02
We present a new framework for defining fuzzy approximations to geometry in terms of a cutoff on the spectrum of the Dirac operator, and a generalization of it that we call the Dirac-Flux operator. This framework does not require a symplectic form on the manifold, and is completely rotation invariant on an arbitrary n-sphere. The framework is motivated by the formalism of Holographic Space-Time (HST), whose fundamental variables are sections of the spinor bundle over a compact Euclidean manifold. The strong holographic principle (SHP) requires the space of these sections to be finite dimensional. We discuss applications of fuzzy spinor geometry to HST and to Matrix Theory.
On a Matrix Identity Connecting Iteration Operators Associated With a p-Cyclic Matrix
Noutsos, Dimitrios
by NSF grant CCR-8619817 and by AFOSR grant 8810243. `Department of Mathematics, University of Ioannina, GR-451 10 Ioannina, Greece. LINEAR ALGEBRA AND ITS APPLICATIONS 182: 157-177 (1993) 157 0 Elsevier
Thermosetting Polymer-Matrix Composites for Strucutral Repair Applications
William Kirby Goertzen
2007-12-01
Several classes of thermosetting polymer matrix composites were evaluated for use in structural repair applications. Initial work involved the characterization and evaluation of woven carbon fiber/epoxy matrix composites for structural pipeline repair. Cyanate ester resins were evaluated as a replacement for epoxy in composites for high-temperature pipe repair applications, and as the basis for adhesives for resin infusion repair of high-temperature composite materials. Carbon fiber/cyanate ester matrix composites and fumed silica/cyanate ester nanocomposites were evaluated for their thermal, mechanical, viscoelastic, and rheological properties as they relate to their structure, chemistry, and processing characteristics. The bisphenol E cyanate ester under investigation possesses a high glass transition temperature, excellent mechanical properties, and unique ambient temperature processability. The incorporate of fumed silica served to enhance the mechanical and rheological properties of the polymer and reduce thermal expansion without sacrificing glass transition or drastically altering curing kinetics. Characterization of the composites included dynamic mechanical analysis, thermomechanical analysis, differential scanning calorimetry, thermogravimetric analysis, rheological and rheokinetic evaluation, and transmission electron microscopy.
Epoxy matrix for solid-state dye laser applications.
Cazeca, M J; Jiang, X; Kumar, J; Tripathy, S K
1997-07-20
The preparation and performance of an epoxy-based matrix impregnated with Pyrromethene 580 for solid-state dye laser applications are discussed. The matrix proved to be stable and efficient as a laser medium when pumped by a frequency-doubled, Q-switched Nd:YAG laser with a 10-ns pulse width. Stability measurements were performed on a 1-mm-thick epoxy sample, doped with Pyrromethene 580 at a concentration of 4 x 10(-3) M. When the sample was pumped at millijoule energy levels, the stability was measured to be ~55,000 pulses from a single spot on the sample before the power dropped by a factor of half. PMID:18259301
Matrix fatigue cracking in {alpha}{sub 2} titanium matrix composites for hypersonic applications
Gabb, T.P.; Gayda, J. [NASA Lewis Research Center, Cleveland, OH (United States)
1996-12-31
The objective of this work was to understand matrix cracking mechanisms in a unidirectional {alpha}{sub 2} titanium matrix composite (TMC) in possible hypersonic applications. A [0]{sub 8} SCS-6/Ti-24Al-11Nb (atomic %) TMC was first subjected to a variety of simple isothermal and nonisothermal fatigue cycles to evaluate the damage mechanisms in simple conditions. A modified ascent mission cycle test was then performed to evaluate the combined effects of loading modes. This cycle mixes mechanical cycling at 150 and 483 C, sustained loads, and a slow thermal cycle to 815 C. At low cyclic stresses and strains more common in hypersonic applications, environment-assisted surface cracking limited fatigue resistance. This damage mechanism was most acute for out-of-phase nonisothermal cycles having extended cycle periods and the ascent mission cycle. A simple linear fraction damage model was employed to help understand this damage mechanism. Time-dependent environmental damage was found to strongly influence out-of-phase and mission life, with mechanical cycling damage due to the combination of external loading and CTE mismatch stresses playing a smaller role. The mechanical cycling and sustained loads in the mission cycle also had a smaller role.
WATER DISTRIBUTION SYSTEM OPERATION: APPLICATION OF
Mays, Larry W.
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
The Golden-Thompson inequality: Historical aspects and random matrix applications
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
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.
Advanced mutation operators applicable in C# programs
Anna Derezinska
2006-01-01
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.
M. I. García-Planas; A. A. Mailybaev
2003-01-01
Matrix pencils under the strict equivalence and matrix pairs under the state feedback equivalence are considered. It is known that a matrix pencil (or a matrix pair) smoothly dependent on parameters can be reduced locally to a special typically more simple form, called the versal deformation, by a smooth change of parameters and a strict equivalence (or feedback equivalence) transformation.
Diagonal multi-matrix correlators and BPS operators in Script N = 4 SYM
NASA Astrophysics Data System (ADS)
Brown, T. W.; Heslop, P. J.; Ramgoolam, S.
2008-02-01
We present a complete basis of multi-trace multi-matrix operators that has a diagonal two point function for the free matrix field theory at finite N. This generalises to multiple matrices the single matrix diagonalisation by Schur polynomials. Crucially, it involves intertwining the gauge group U(N) and the global symmetry group U(M) with Clebsch-Gordan coefficients of symmetric groups Sn. When applied to Script N = 4 super Yang-Mills we consider the U(3) subgroup of the full symmetry group. The diagonalisation allows the description of a dual basis to multi-traces, which permits the characterisation of the metric on operators transforming in short representations at weak coupling. This gives a framework for the comparison of quarter and eighth-BPS giant gravitons of AdS5 × S5 spacetime to gauge invariant operators of the dual Script N = 4 SYM.
Erosion Resistant Coatings for Polymer Matrix Composites in Propulsion Applications
NASA Technical Reports Server (NTRS)
Sutter, James K.; Naik, Subhash K.; Horan, Richard; Miyoshi, Kazuhisa; Bowman, Cheryl; Ma, Kong; Leissler, George; Sinatra, Raymond; Cupp, Randall
2003-01-01
Polymer Matrix Composites (PMCs) offer lightweight and frequently low cost alternatives to other materials in many applications. High temperature PMCs are currently used in limited propulsion applications replacing metals. Yet in most cases, PMC propulsion applications are not in the direct engine flow path since particulate erosion degrades PMC component performance and therefore restricts their use in gas turbine engines. This paper compares two erosion resistant coatings (SANRES and SANPRES) on PMCs that are useful for both low and high temperature propulsion applications. Collaborating over a multi-year period, researchers at NASA Glenn Research Center, Allison Advanced Developed Company, and Rolls-Royce Corporation have optimized these coatings in terms of adhesion, surface roughness, and erosion resistance. Results are described for vigorous hot gas/particulate erosion rig and engine testing of uncoated and coated PMC fan bypass vanes from the AE 3007 regional jet gas turbine engine. Moreover, the structural durability of these coatings is described in long-term high cycle fatigue tests. Overall, both coatings performed well in all tests and will be considered for applications in both commercial and defense propulsion applications.
Dry borax applicator operator's manual.
Karsky, Richard, J.
1999-01-01
Annosum root rot affects conifers throughout the Northern Hemisphere, infecting their roots and eventually killing the trees. The fungus Heterobasidion annosum causes annosum root rot. The fungus colonizes readily on freshly cut stumps. Partially cut stands have a high risk of infestation because the fungus can colonize on each of the stumps and potentially infect the neighboring trees. Wind and rain carry the annosum spores. Spores that land on freshly cut stumps grow down the stump's root system where they can infect living trees through root grafts or root contacts. Once annosum becomes established, it can remain active for many years in the Southern United States and for several decades in the north. About 7% of the trees that become infected die. When thinning, stumps can be treated successfully using a competing fungus, Phlebia gigantea, and with ''Tim-Bor'' in liquid formulations. These liquid products are no longer approved in the United States. Only the dry powder form is registered and approved by the EPA. Stumps can be treated with a dry formula of borax, (Sporax), significantly reducing one of the primary routes by which Heterobasidion annosum infects a stand of trees. Sporax is used by the USDA Forest Service to control annosum root rot. Sporax is now applied by hand, but once the felled trees are skidded it becomes very hard to locate the stumps. A stump applicator will reduce error, labor costs, and hazards to workers.
Encoding the structure of many-body localization with matrix product operators
NASA Astrophysics Data System (ADS)
Pekker, David; Clark, Bryan K.
2015-03-01
Anderson insulators are non-interacting disordered systems which have localized single particle eigenstates. The interacting analogue of Anderson insulators are the Many-Body Localized (MBL) phases. The natural language for representing the spectrum of the Anderson insulator is that of product states over the single-particle modes. We show that product states over Matrix Product Operators of small bond dimension is the corresponding natural language for describing the MBL phases. In this language all of the many-body eigenstates are encode by Matrix Product States (i.e. DMRG wave function) consisting of only two sets of low bond-dimension matrices per site: the Gi matrix corresponding to the local ground state on site i and the Ei matrix corresponding to the local excited state. All 2 n eigenstates can be generated from all possible combinations of these matrices.
INR proton Linac operation and applications
NASA Astrophysics Data System (ADS)
Kravchuk, Leonid V.
2006-06-01
The INR Proton Linear Accelerator is presently under operation for about 2400 h per year with energy about 250 MeV and average current up to 150 ?A. The Linac applications are mainly as follows: neutron and condensed matter research at spallation neutron source and neutron spectrometers, isotope production for medicine and industry, beam therapy. The experimental area description and the Linac operational experience are given in the paper.
On a Commutative Ring of Two Variable Differential Operators with Matrix Coefficients
A. E. Mironov
2008-04-01
In this work, we construct commutative rings of two variable matrix differential operators that are isomorphic to a ring of meromorphic functions on a rational manifold obtained from the $CP^1\\times CP^1$ by identification of two lines with the pole on a certain rational curve.
The most general L operator for the R -matrix of the XXX model
A. G. Izergin; V. E. Korepin
1984-01-01
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.
Two-Loop Massive Operator Matrix Elements for Polarized and Unpolarized Deep-Inelastic Scattering
I. Bierenbaum; J. Blümlein; S. Klein
2007-06-19
The $O(\\alpha_s^2)$ massive operator matrix elements for unpolarized and polarized heavy flavor production at asymptotic values $Q^2 >> m^2$ are calculated in Mellin space without applying the integration-by-parts method. We confirm previous results given in Refs. \\cite{BU1,BU2}, however, obtain much more compact representations.
Calculation of Massive 2-Loop Operator Matrix Elements with Outer Gluon Lines
I. Bierenbaum; J. Blümlein; S. Klein
2007-02-26
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.
Application of the matrix converter to induction motor drives
Takayoshi Matsuo; Steffen Bernet; R. S. Colby; T.A. Lipo
1996-01-01
This paper presents the technical issues of applying the matrix power converter to field-oriented induction motor drives. A newly developed matrix power converter switching sequence combination is described in detail, the purpose of which is to minimize harmonic components of the matrix power converter input currents. It is demonstrated that small size capacitors work efficiently as input filters. Matrix power
Fujimoto, Hiroshi
Direct Power Control Based Matrix Converter and Its Operation Characteristics Toshihiko Noguchi of the whole apparatus. In recent years, therefore, matrix converters have intensively been studied and many researchers have published a numerous number of papers on the matrix converters because it makes a direct AC
NASA Astrophysics Data System (ADS)
Trimpin, Sarah; Inutan, Ellen D.
2013-05-01
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.
Matrix elements of ? B =0 operators in heavy hadron chiral perturbation theory
NASA Astrophysics Data System (ADS)
Lee, Jong-Wan
2015-05-01
We study the light-quark mass and spatial volume dependence of the matrix elements of ? B =0 four-quark operators relevant for the determination of Vu b and the lifetime ratios of single-b hadrons. To this end, one-loop diagrams are computed in the framework of heavy hadron chiral perturbation theory with partially quenched formalism for three light-quark flavors in the isospin limit; flavor-connected and -disconnected diagrams are carefully analyzed. These calculations include the leading light-quark flavor and heavy-quark spin symmetry breaking effects in the heavy hadron spectrum. Our results can be used in the chiral extrapolation of lattice calculations of the matrix elements to the physical light-quark masses and to infinite volume. To provide insight on such chiral extrapolation, we evaluate the one-loop contributions to the matrix elements containing external Bd, Bs mesons and ?b baryon in the QCD limit, where sea and valence quark masses become equal. In particular, we find that the matrix elements of the ?3 flavor-octet operators with an external Bd meson receive the contributions solely from connected diagrams in which current lattice techniques are capable of precise determination of the matrix elements. Finite volume effects are at most a few percent for typical lattice sizes and pion masses.
Nondestructive Damage Evaluation in Ceramic Matrix Composites for Aerospace Applications
Dassios, Konstantinos G.; Kordatos, Evangelos Z.; Aggelis, Dimitrios G.; Matikas, Theodore E.
2013-01-01
Infrared thermography (IRT) and acoustic emission (AE) are the two major nondestructive methodologies for evaluating damage in ceramic matrix composites (CMCs) for aerospace applications. The two techniques are applied herein to assess and monitor damage formation and evolution in a SiC-fiber reinforced CMC loaded under cyclic and fatigue loading. The paper explains how IRT and AE can be used for the assessment of the material's performance under fatigue. IRT and AE parameters are specifically used for the characterization of the complex damage mechanisms that occur during CMC fracture, and they enable the identification of the micromechanical processes that control material failure, mainly crack formation and propagation. Additionally, these nondestructive parameters help in early prediction of the residual life of the material and in establishing the fatigue limit of materials rapidly and accurately. PMID:23935428
Symmetric nonnegative matrix factorization: algorithms and applications to probabilistic clustering.
He, Zhaoshui; Xie, Shengli; Zdunek, Rafal; Zhou, Guoxu; Cichocki, Andrzej
2011-12-01
Nonnegative matrix factorization (NMF) is an unsupervised learning method useful in various applications including image processing and semantic analysis of documents. This paper focuses on symmetric NMF (SNMF), which is a special case of NMF decomposition. Three parallel multiplicative update algorithms using level 3 basic linear algebra subprograms directly are developed for this problem. First, by minimizing the Euclidean distance, a multiplicative update algorithm is proposed, and its convergence under mild conditions is proved. Based on it, we further propose another two fast parallel methods: ?-SNMF and ? -SNMF algorithms. All of them are easy to implement. These algorithms are applied to probabilistic clustering. We demonstrate their effectiveness for facial image clustering, document categorization, and pattern clustering in gene expression. PMID:22042156
Application of the device of slices for automation of matrix calculations
NASA Astrophysics Data System (ADS)
Romanovsky, E. A.
2014-12-01
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.
A SQUARED SMOOTHING NEWTON METHOD FOR NONSMOOTH MATRIX EQUATIONS AND ITS APPLICATIONS IN
Sun, Defeng
to convert (1.1) into a matrix equation problem. For X 0 we denote its symmetric square root by X1/2 . Let |XA SQUARED SMOOTHING NEWTON METHOD FOR NONSMOOTH MATRIX EQUATIONS AND ITS APPLICATIONS method for solving a nonsmooth matrix equation that includes semidefinite programming
Hanford Site air operating permit application
NONE
1995-05-01
The Clean Air Act Amendments of 1990, which amended the Federal Clean Air Act of 1977, required that the US Environmental Protection Agency develop a national Air Operating Permit Program, which in turn would require each state to develop an Air Operating Permit Program to identify all sources of ``regulated`` pollutants. Regulated pollutants include ``criteria`` pollutants (oxides of nitrogen, sulfur oxides, total suspended particulates, carbon monoxide, particulate matter greater than 10 micron, lead) plus 189 other ``Hazardous`` Air Pollutants. The Hanford Site, owned by the US Government and operated by the US Department of Energy, Richland Operations Office, is located in southcentral Washington State and covers 560 square miles of semi-arid shrub and grasslands located just north of the confluence of the Snake and Yakima Rivers with the Columbia River. This land, with restricted public access, provides a buffer for the smaller areas historically used for the production of nuclear materials, waste storage, and waste disposal. About 6 percent of the land area has been disturbed and is actively used. The Hanford Site Air Operating Permit Application consists of more than 1,100 sources and in excess of 300 emission points. Before January 1995, the maintenance and operations contractor and the environmental restoration contractor for the US Department of Energy completed an air emission inventory on the Hanford Site. The inventory has been entered into a database so that the sources and emission points can be tracked and updated information readily can be retrieved. The Hanford Site Air Operating Permit Application contains information current as of April 19, 1995.
Fuzzy geometry via the spinor bundle, with applications to holographic space-time and matrix theory
Banks, Tom [NHETC and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019 (United States); SCIPP and Department of Physics, University of California, Santa Cruz, California 95064-1077 (United States); Kehayias, John [SCIPP and Department of Physics, University of California, Santa Cruz, California 95064-1077 (United States)
2011-10-15
We present a new framework for defining fuzzy approximations to geometry in terms of a cutoff on the spectrum of the Dirac operator, and a generalization of it that we call the Dirac-flux operator. This framework does not require a symplectic form on the manifold, and is completely rotation invariant on an arbitrary n-sphere. The framework is motivated by the formalism of holographic space-time, whose fundamental variables are sections of the spinor bundle over a compact Euclidean manifold. The strong holographic principle requires the space of these sections to be finite dimensional. We discuss applications of fuzzy spinor geometry to holographic space-time and to matrix theory.
Operational Experience with the Scattering Matrix Arc Detection System on the JET ITER-Like Antenna
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
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.
Menéndez, Javier [Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt (Germany)
2013-12-30
We explore the theoretical uncertainties related to the transition operator of neutrinoless double-beta (0???) decay. The transition operator used in standard calculations is a product of one-body currents, that can be obtained phenomenologically as in Tomoda [1] or Šimkovic et al. [2]. However, corrections to the operator are hard to obtain in the phenomenological approach. Instead, we calculate the 0??? decay operator in the framework of chiral effective theory (EFT), which gives a systematic order-by-order expansion of the transition currents. At leading orders in chiral EFT we reproduce the standard one-body currents of Refs. [1] and [2]. Corrections appear as two-body (2b) currents predicted by chiral EFT. We compute the effects of the leading 2b currents to the nuclear matrix elements of 0??? decay for several transition candidates. The 2b current contributions are related to the quenching of Gamow-Teller transitions found in nuclear structure calculations.
NASA Astrophysics Data System (ADS)
Menéndez, Javier
2013-12-01
We explore the theoretical uncertainties related to the transition operator of neutrinoless double-beta (0???) decay. The transition operator used in standard calculations is a product of one-body currents, that can be obtained phenomenologically as in Tomoda [1] or Šimkovic et al. [2]. However, corrections to the operator are hard to obtain in the phenomenological approach. Instead, we calculate the 0??? decay operator in the framework of chiral effective theory (EFT), which gives a systematic order-by-order expansion of the transition currents. At leading orders in chiral EFT we reproduce the standard one-body currents of Refs. [1] and [2]. Corrections appear as two-body (2b) currents predicted by chiral EFT. We compute the effects of the leading 2b currents to the nuclear matrix elements of 0??? decay for several transition candidates. The 2b current contributions are related to the quenching of Gamow-Teller transitions found in nuclear structure calculations.
Fission matrix capability for MCNP, Part II - Applications
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
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)
NASA Astrophysics Data System (ADS)
Gaya-Piqué, Luis R.; Stefanova, Stefka; Hawkins, Ward L.; Sweeney, Jerry J.; Melamud, Mordechai; Prah, Matjaz
2010-05-01
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.
An SVD-like matrix decomposition and its applications
Xu, Hongguo
2003-07-15
*(iJ)y. In this paper we provide several matrix factorizations related to symplectic matrices. We introduce a singular value-like decomposition B = QDS(-1) for any real matrix B is an element of R-n x 2m, where Q is real orthogonal, S is real symplectic, and D...
Random Matrix Application to Correlations Among Volatility of Assets
Singh, Ajay
2013-01-01
In this paper, we apply tools from the random matrix theory (RMT) to estimates of correlations across volatility of various assets in the S&P 500. The volatility inputs are estimated by modeling price fluctuations as GARCH(1,1) process. The corresponding correlation matrix is constructed. It is found that the distribution of a significant number of eigenvalues of the volatility correlation matrix matches with the analytical result from the RMT. Furthermore, the empirical estimates of short and long-range correlations among eigenvalues, which are within the RMT bounds, match with the analytical results for Gaussian Orthogonal ensemble (GOE) of the RMT. To understand the information content of the largest eigenvectors, we estimate the contribution of GICS industry groups in each eigenvector. In comparison with eigenvectors of correlation matrix for price fluctuations, only few of the largest eigenvectors of volatility correlation matrix are dominated by a single industry group. We also study correlations am...
Graphite Fiber/Copper Matrix Composites for Space Power Heat Pipe Fin Applications
NASA Technical Reports Server (NTRS)
McDanels, David L.; Baker, Karl W.; Ellis, David L.
1991-01-01
High specific thermal conductivity (thermal conductivity divided by density) is a major design criterion for minimizing system mass for space power systems. For nuclear source power systems, graphite fiber reinforced copper matrix (Gr/Cu) composites offer good potential as a radiator fin material operating at service temperatures above 500 K. Specific thermal conductivity in the longitudinal direction is better than beryllium and almost twice that of copper. The high specific thermal conductivity of Gr/Cu offers the potential of reducing radiator mass by as much as 30 percent. Gr/Cu composites also offer the designer a range of available properties for various missions and applications. The properties of Gr/Cu are highly anisotropic. Longitudinal elastic modulus is comparable to beryllium and about three times that of copper. Thermal expansion in the longitudinal direction is near zero, while it exceeds that of copper in the transverse direction.
Gram matrix of a Laguerre model: application to model reduction of irrational transfer function
Paris-Sud XI, Université de
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
Applications of the Transmission Line Matrix Method to Microwave Scanning Razvan Ciocan
Ida, Nathan
of scanning microwave microscopy were determined based on an initial frequency experimental response obtainedApplications 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
Graph-Preserving Sparse Non-Negative Matrix Factorization with Application to Facial
Flierl, Markus
1 Graph-Preserving Sparse Non-Negative Matrix Factorization with Application to Facial Expression, Fellow, IEEE Abstract In this paper, a novel graph-preserving sparse non-negative matrix factorization the original NMF algorithm by exploiting both sparse and graph-preserving properties. The latter may contain
The Gluonic Operator Matrix Elements at O(?_s^2) for DIS Heavy Flavor Production
I. Bierenbaum; J. Blümlein; S. Klein
2009-01-06
We calculate the $O(\\alpha_s^2)$ gluonic operator matrix elements for the twist--2 operators, which contribute to the heavy flavor Wilson coefficients in unpolarized deeply inelastic scattering in the region $Q^2 \\gg m^2$, up to the linear terms in the dimensional parameter $\\varepsilon$, ($D= 4 + \\varepsilon$). These quantities are required for the description of parton distribution functions in the variable flavor number scheme (VFNS). The $O(\\alpha_s^2 \\varepsilon)$ terms contribute at the level of the $O(\\alpha_s^3)$ corrections through renormalization. We also comment on additional terms, which have to be considered in the fixed (FFNV) and variable flavor number scheme, adopting the $\\overline{\\rm MS}$ scheme for the running coupling constant.
Structural and functional polymer-matrix composites for electromagnetic applications
NASA Astrophysics Data System (ADS)
Wu, Junhua
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
Polydimethyl siloxane (PDMS) and zeolite incorporated mixed matrix materials are gaining importance in a variety of applications including membrane separation. PDMS based membranes are used in pervaporation (PV), a membrane technology, for the selective removal of organics such ...
Glueball matrix elements: a lattice calculation and applications
NASA Astrophysics Data System (ADS)
Meyer, Harvey B.
2009-01-01
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/? 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 f0 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.
The production and application of metal matrix composite materials
J. W. Kaczmar; K. Pietrzak; W. W?osi?ski
2000-01-01
The production methods and properties of metal matrix composite materials reinforced with dispersion particles, platelets, non-continuous (short) and continuous (long) fibres are discussed in this paper. The most widely applied methods for the production of composite materials and composite parts are based on casting techniques such as the squeeze casting of porous ceramic preforms with liquid metal alloys and powder
Modern solutions for industrial matrix-converter applications
Olaf Simon; Jochen Mahlein; Mark Nils Muenzer; M. Bruckmarm
2002-01-01
Thus far, matrix converter topology has not reached industrial use. Reasons for this have been complex control schemes, inefficient solutions for overvoltage protection, questionable robustness of the bi-directional switch commutation at disturbed supply voltages, and missing power semiconductor modules. Recent research results concerning these problems have led to innovative solutions and, from a technical point of view, industrial use seems
Development of Ceramic Matrix Composites For High Temperature Applications
NASA Technical Reports Server (NTRS)
Heimann, Paula
2004-01-01
The microstructure and mechanical properties of carbon fiber reinforced silicon carbide (C/SiC) composites that incorporated molecular-level oxidation inhibitors designed to increase the material s high temperature durability were characterized. The viability of a fiber-level inhibitor incorporated as part of a layered interface system as well as a molecularly-integrated matrix-level oxidation inhibitor that is co-deposited with the SiC matrix during Chemical Vapor Infiltration (CVI) was determined. It was expected that the inhibitor would act as a glass former that will getter the oxygen and form a crack sealant to reduce further ingress of oxygen into the composite. Three composites were examined. Composite A was a baseline C(sub f)/SiC(sub m) composite that incorporated a approx. 0.4 micron pyrolytic carbon (PyC) fiber coating to promote strength and toughness, and a CVI-derived SiC matrix. Composite B was a C(sub f)/SiC(sub m) composite incorporating a approx 0.4 micron pyrolytic carbon (PyC) fiber coating to promote strength and toughness, a approx. 0.6 micron B4C fiber-level oxidation barrier coating, and a CVI-derived SiC matrix. Composite C was a C(sub f) /SiC(sub m) composite that incorporated a approx. 0.4 micron pyrolytic carbon (PyC) fiber coating to promote strength and toughness, a approx. 0.6 micron B4C fiber-level oxidation barrier coating, and a BxC-SiC oxidation-inhibited matrix produced by CVI co-deposition. All composites were reinforced with 10 plies of T-300 balanced plain weave carbon fabric with 3K tows at 12.5 ends per inch.
Arena - A run-time operating system for parallel applications
Ken Mayes; James Bridgland
1997-01-01
This paper presents the case for arun-time operating sys- tem to provide predictable and controllable resource man- agement for parallel applications. Developments in com- pilers for parallel applications, which depend on analy- sis of program behaviour, require corresponding develop- ments in predictable and controllable operating system- level resource management. A customisable system, Arena, is described which provides operating system-level resource
Applications of Real-Time Matrix-Acidizing Evaluation Method
L. P. Prouvost; M. J. Economides
1989-01-01
A new technique for real-time matrix-acidizing job evaluation has recently been presented that uses reservoir transients during acid injection to simulate pressure response of the unperturbed reservoir and compares simulated pressures with measured values. The difference between these values is attributed to the changing skin effect. An associated pretreatment injection\\/falloff test is presented as an essential element of that method.
Spectrum of walk matrix for Koch network and its application.
Xie, Pinchen; Lin, Yuan; Zhang, Zhongzhi
2015-06-14
Various structural and dynamical properties of a network are encoded in the eigenvalues of walk matrix describing random walks on the network. In this paper, we study the spectra of walk matrix of the Koch network, which displays the prominent scale-free and small-world features. Utilizing the particular architecture of the network, we obtain all the eigenvalues and their corresponding multiplicities. Based on the link between the eigenvalues of walk matrix and random target access time defined as the expected time for a walker going from an arbitrary node to another one selected randomly according to the steady-state distribution, we then derive an explicit solution to the random target access time for random walks on the Koch network. Finally, we corroborate our computation for the eigenvalues by enumerating spanning trees in the Koch network, using the connection governing eigenvalues and spanning trees, where a spanning tree of a network is a subgraph of the network, that is, a tree containing all the nodes. PMID:26071700
Spectrum of walk matrix for Koch network and its application
NASA Astrophysics Data System (ADS)
Xie, Pinchen; Lin, Yuan; Zhang, Zhongzhi
2015-06-01
Various structural and dynamical properties of a network are encoded in the eigenvalues of walk matrix describing random walks on the network. In this paper, we study the spectra of walk matrix of the Koch network, which displays the prominent scale-free and small-world features. Utilizing the particular architecture of the network, we obtain all the eigenvalues and their corresponding multiplicities. Based on the link between the eigenvalues of walk matrix and random target access time defined as the expected time for a walker going from an arbitrary node to another one selected randomly according to the steady-state distribution, we then derive an explicit solution to the random target access time for random walks on the Koch network. Finally, we corroborate our computation for the eigenvalues by enumerating spanning trees in the Koch network, using the connection governing eigenvalues and spanning trees, where a spanning tree of a network is a subgraph of the network, that is, a tree containing all the nodes.
Bessel's differential operators and application to linear differential equations
Isaac I. H. Chen; T. W. Barrett
1982-01-01
The Bessel's differential operators are defined in this article. The commutator bracket is calculated with respect to the differential operators bn and bn . The differential operators commute with each other only if n = 0. The application of these operators to linear differential equations is discussed.
Ceramic matrix composites for rocket engine turbine applications
NASA Technical Reports Server (NTRS)
Herbell, Thomas P.; Eckel, Andrew J.
1992-01-01
A program to establish the potential for introducing fiber reinforced ceramic matrix composites (FRCMC) in future rocket engine turbopumps was instituted in 1987. A brief summary of the overall program (both contract and in-house research) is presented. Tests at NASA Lewis include thermal upshocks in a hydrogen/oxygen test rig capable of generating heating rates up to 2500 C/sec. Post thermal upshock exposure evaluation includes the measurement of residual strength and failure analysis. Test results for monolithic ceramics and several FRCMC are presented. Hydrogen compatibility was assessed by isothermal exposure of monolithic ceramics in high temperature gaseous hydrogen plus water vapor.
Small-energy analysis for the selfadjoint matrix Schrödinger operator on the half line. II
Aktosun, Tuncay, E-mail: aktosun@uta.edu [Department of Mathematics, University of Texas at Arlington, Arlington, Texas 76019-0408 (United States)] [Department of Mathematics, University of Texas at Arlington, Arlington, Texas 76019-0408 (United States); Klaus, Martin, E-mail: mklaus@math.vt.edu [Department of Mathematics, Virginia Tech, Blacksburg, Virginia 24061 (United States)] [Department of Mathematics, Virginia Tech, Blacksburg, Virginia 24061 (United States); Weder, Ricardo, E-mail: weder@unam.mx [Departamento de Física Matemática, Instituto de Investigaciones en Matemáticas Aplicadas y en Sistemas, Universidad Nacional Autónoma de México, Apartado Postal 20-126, Col. San Angel, C.P. 01000, México D.F., México (Mexico)] [Departamento de Física Matemática, Instituto de Investigaciones en Matemáticas Aplicadas y en Sistemas, Universidad Nacional Autónoma de México, Apartado Postal 20-126, Col. San Angel, C.P. 01000, México D.F., México (Mexico)
2014-03-15
The matrix Schrödinger equation with a selfadjoint matrix potential is considered on the half line with the most general selfadjoint boundary condition at the origin. When the matrix potential is integrable and has a second moment, it is shown that the corresponding scattering matrix is differentiable at zero energy. An explicit formula is provided for the derivative of the scattering matrix at zero energy. The previously established results when the potential has only the first moment are improved when the second moment exists, by presenting the small-energy asymptotics for the related Jost matrix, its inverse, and various other quantities relevant to the corresponding direct and inverse scattering problems.
Application of ceramic fibers to the manufacture of reinforced metal-matrix composites
Wielage, B.; Rahm, J.; Steinhaeuser, S. [Technical Univ., Chemnitz (Germany). Inst. of Composites
1995-12-31
The application of the thermal spraying process is a new way to produce carbon fiber or Tyranno fiber reinforced aluminum matrix composites. Spreaded fiber rovings are enveloped in the matrix material with wire flame spraying. The advantage of the thermal spraying process is based in the low times for contacting between the fibers and the liquid matrix material. Chemical reactions on the interface fiber/matrix, which are caused by the decreasing of the fiber tensile strength, can be excluded. The thermal sprayed prepregs can be compressed to MMC by hot pressing process. This longfiber reinforced composites are used to increase f.e. casted components of motors. The aim of this research is the estimation of possibilities to applicate the wire flame spray process for prepreg manufacturing.
Matrix porosity calculation in volcanic and dolomite reservoirs and its application
Ning Li; Hongliang Wu; Qingfu Feng; Kewen Wang; Yujiang Shi; Qingfeng Li; Xinping Luo
2009-01-01
Matrix porosity calculations of fractured and vuggy reservoirs, such as volcanics and weathered dolomite, are one of the problems\\u000a urgently needed to solve in well-log evaluation. In this paper, we first compare the an empirical formula for porosity calculation\\u000a from full diameter rhyolite core experiments with the matrix porosity formulas commonly used. We discuss the applicability\\u000a of the empirical formula
A three-phase AC\\/AC high-frequency link matrix converter for VSCF applications
H. J. Cha; Prasad N. Enjeti
2003-01-01
In this paper, a new three-phase high-frequency link matrix converter is discussed and the topology of conventional matrix converter is modified with the addition of a transformer for a variable speed constant frequency (VSCF) application. The proposed approach accomplishes voltage transfer ratio more than unity, galvanic isolation between both voltage sources and higher power density by employing a high-frequency transformer
Improved MALDI-TOF microbial mass spectrometry imaging by application of a dispersed solid matrix.
Vergeiner, Stefan; Schafferer, Lukas; Haas, Hubertus; Müller, Thomas
2014-08-01
The key step in high quality microbial matrix-assisted laser desorption/ionization mass spectrometry imaging (microbial MALDI MSI) is the fabrication of a homogeneous matrix coating showing a fine-grained morphology. This application note addresses a novel method to apply solid MALDI matrices onto microbial cultures grown on thin agar media. A suspension of a mixture of 2,5-DHB and ?-CHCA is sprayed onto the agar sample surface to form highly homogeneous matrix coatings. As a result, the signal intensities of metabolites secreted by the fungus Aspergillus fumigatus were found to be clearly enhanced. PMID:24894842
NASA Astrophysics Data System (ADS)
Neacsu, Andrei; Stoica, Sabin; Horoi, Mihai
2012-12-01
We present a new, fast algorithm and computing code developed to efficiently calculate the two-body matrix elements (TBMEs) of the neutrinoless double-beta decay transition operator, which are necessary for the shell model calculation of the double-beta decay matrix elements in the closure approximation. The improvement consists of a rearrangement of the expression of the TBMEs that allows us to do the radial integrals analytically, and thus only the integration over the momentum remains to be performed numerically. This fast algorithm is an important step forward in investigating quenching effects of the transition operator by considering their evolution in increasingly larger shell model spaces.
New processable modified polyimide resins for adhesive and matrix applications
NASA Technical Reports Server (NTRS)
Landman, D.
1985-01-01
A broad product line of bismaleimide modified epoxy adhesives which are cured by conventional addition curing methods is described. These products fill a market need for 232 C (450 F) service adhesives which are cured in a manner similar to conventional 177 C (350 F) epoxy adhesives. The products described include film adhesives, pastes, and a primer. Subsequent development work has resulted in a new bismaleimide modified epoxy resin which uses a unique addition curing mechanism. This has resulted in products with improved thermomechanical properties compared to conventional bismaleimide epoxy resins. A film adhesive, paste, and matrix resin for composites using this new technology are described. In all cases, the products developed are heat cured by using typical epoxy cure cycles i.e., 1 hour at 177 C (350 F) followed by 2 hours postcure at 246 C (475 F).
Magnet operating experience review for fusion applications
Cadwallader, L.C.
1991-11-01
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.
Neutronic aspects of inert matrix fuels for application in ADS
NASA Astrophysics Data System (ADS)
Wallenius, J.
2003-07-01
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.
Application of Nonnegative Matrix Factorization to Musical Instrument Classification
Emmanouil Benetos; Margarita Kotti; Constantine Kotropoulos
In this paper, a class of algorithms for automatic classification of individual musical instrument sounds is pre- sented. Several perceptual features used in general sound clas- sification applications were measured for 300 sound recordings consisting of 6 different musical instrument classes (piano, vio- lin, cello, flute, bassoon, and soprano saxophone). In addition, MPEG-7 basic spectral and spectral basis descriptors were
Applications of real-time matrix-acidizing evaluation method
Prouvost, L.P.; Economides, M.J. (Dowell Schlumberger (US))
1989-11-01
A new technique for real-time matrix-acidizing job evaluation has recently been presented that uses reservoir transients during acid injection to simulate pressure response of the unperturbed reservoir and compares simulated pressures with measured values. The difference between these values is attributed to the changing skin effect. An associated pretreatment injection/falloff test is presented as an essential element of that method. It involves injection of an inert fluid (water or reservoir oil) and analysis of the ensuing falloff for a period during which pumping has stopped just before acid enters the perforations. Injection resumes immediately thereafter. Two field case studies, a water-injection well in a fissured carbonate reservoir and an oil well completed in a sandstone reservoir, demonstrate the technique. For both treatments, conclusions are drawn regarding the effectiveness of the acid injection. The job evolution is demonstrated, and forecasts of expected well performance for unstimulated and stimulated cases are presented. The skin evolution is shown as a function of injection time. The simulated and measured pressure values for both treatments are shown, indicating the real-time job progression.
I. Bierenbaum; J. Blümlein; S. Klein
2007-10-18
We calculate the O($\\eps$)--term of the two--loop massive operator matrix elements for twist 2--operators, which contribute to the heavy flavour Wilson coefficients in unpolarized deep--inelastic scattering in the asymptotic limit $Q^2 \\gg m^2.$ Our calculation was performed in Mellin space using Mellin--Barnes integrals and generalized hypergeometric functions. The O($\\eps$)--term contributes in the renormalization at 3--loop order.
Some Applications of Polynomial Optimization in Operations ...
2015-04-09
in Operations Research and Real-Time Decision Making. Amir Ali Ahmadi ... teed signal quality and minimum transmission power, (ii) computing real-time certificates of collision avoidance for a ...... on embedded systems [29], [28]. In particular ...
Liu, Xiaoji; Qin, Xiaolan
2015-01-01
We investigate additive properties of the generalized Drazin inverse in a Banach algebra A. We find explicit expressions for the generalized Drazin inverse of the sum a + b, under new conditions on a, b ? A. As an application we give some new representations for the generalized Drazin inverse of an operator matrix. PMID:25729767
Yinchao Chen; Benjamin Beker
1993-01-01
A differential matrix operator technique is presented to simplify the formulation of boundary-value problems for open millimeter-wave integrated circuits that use anisotropic substrates. The spectral-domain method is applied to analyze the propagation characteristics of single and coupled microstrip lines printed on anisotropic substrates whose properties are described by both [?] and [?] tensors. In addition to considering the permittivity and
Matrix elements of the electromagnetic operator between kaon and pion states
Baum, I. [Dip. di Fisica, Universita di Roma ''La Sapienza'', P.le A. Moro 5, I-00185 Roma (Italy); Lubicz, V. [Dip. di Fisica, Universita Roma Tre, Via della Vasca Navale 84, I-00146 Roma (Italy); INFN, Sezione di Roma Tre, Via della Vasca Navale 84, I-00146 Roma (Italy); Martinelli, G. [SISSA, Via Bonomea 265, I-34136 Trieste (Italy); Orifici, L. [Dip. di Fisica, Universita Roma Tre, Via della Vasca Navale 84, I-00146 Roma (Italy); Simula, S. [INFN, Sezione di Roma Tre, Via della Vasca Navale 84, I-00146 Roma (Italy)
2011-10-01
We compute the matrix elements of the electromagnetic operator sF{sub {mu}{nu}}{sigma}{sup {mu}{nu}}d between kaon and pion states, using lattice QCD with maximally twisted-mass fermions and two flavors of dynamical quarks (N{sub f}=2). The operator is renormalized nonperturbatively in the RI'/MOM scheme and our simulations cover pion masses as light as 270 MeV and three values of the lattice spacing from {approx_equal}0.07 up to {approx_equal}0.1 fm. At the physical point our result for the corresponding tensor form factor at zero-momentum transfer is f{sub T}{sup K{pi}}(0)=0.417(14{sub stat})(5{sub syst}), where the systematic error does not include the effect of quenching the strange and charm quarks. Our result differs significantly from the old quenched result f{sub T}{sup K{pi}}(0)=0.78(6) obtained by the SPQ{sub cd}R Collaboration with pion masses above 500 MeV. We investigate the source of this difference and conclude that it is mainly related to the chiral extrapolation. We also study the tensor charge of the pion and obtain the value f{sub T}{sup {pi}{pi}}(0)=0.195(8{sub stat})(6{sub syst}) in good agreement with, but more accurate than the result f{sub T}{sup {pi}{pi}}(0)=0.216(34) obtained by the QCDSF Collaboration using higher pion masses.
Ribes, Aurélien
Application of the Transmission Line Matrix method for outdoor sound propagation modelling Part 2-domain acoustic model is based on the Transmission Line Matrix method. Its develop- ment has also been promoted, meteorological conditions, etc. In part 1, the presentation and evaluation of the Transmission Line Matrix method
The labour force matrix of Pakistan: selected applications.
Cohen, S I
1985-01-01
This paper develops and estimates a labor force matrix (LFM) for Pakistan, which is shown to be a new and very useful tool in describing the multi-dimensional nature of the work force and its dynamic characteristics over time. The paper then uses the LFM as a guideline in the simulation of the labor force in the 6th Five-Year Plan. The LFM allows one to read the number of persons who belong to a specific combination of location, status, sector, occupation, and education, and is, therefore, superior to 2-dimensional cross-tabulations. Under plausible assumptions, such matrices have been constructed from published data of the labor surveys of 1977-1978 and 1982-1983 and projected to 1988. The authors simulated the 6th Plan by means of a model which forecasts demand and supply and generates a planned LFM for 1988. A comparison between the 2 matrices shows that on the whole the plan does not predict major surprises in the structure of the labor force. Concurrently, the results suggest some future unresolved shortage-imbalances for production workers and the lowest educational levels and some surpluses of a frictional nature in the upper skills and educational levels. Even though the apparent recommendations for balancing the labor force may be more vocational training, a higher rate of primary school enrollment and fewer primary school dropouts, and job upgrading at the higher end of skills and education, a complementary analysis is required before sensible conclusions can be drawn. Besides, a disaggregation into many more occupations and short-term labor market signals as regards trends in vacancies and relative earnings are indispensable in complementing the obtained picture. PMID:12340756
Recovering the missing components in a large noisy low-rank matrix: application to SFM.
Chen, Pei; Suter, David
2004-08-01
In computer vision, it is common to require operations on matrices with "missing data," for example, because of occlusion or tracking failures in the Structure from Motion (SFM) problem. Such a problem can be tackled, allowing the recovery of the missing values, if the matrix should be of low rank (when noise free). The filling in of missing values is known as imputation. Imputation can also be applied in the various subspace techniques for face and shape classification, online "recommender" systems, and a wide variety of other applications. However, iterative imputation can lead to the "recovery" of data that is seriously in error. In this paper, we provide a method to recover the most reliable imputation, in terms of deciding when the inclusion of extra rows or columns, containing significant numbers of missing entries, is likely to lead to poor recovery of the missing parts. Although the proposed approach can be equally applied to a wide range of imputation methods, this paper addresses only the SFM problem. The performance of the proposed method is compared with Jacobs' and Shum's methods for SFM. PMID:15641734
Operational Applications of Satellite Snowcover Observations
NASA Technical Reports Server (NTRS)
Rango, A. (editor); Peterson, R. (editor)
1980-01-01
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.
Robust Joining and Assembly of Ceramic Matrix Composites for High Temperature Applications
NASA Technical Reports Server (NTRS)
Singh, Mrityunjay
2003-01-01
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.
Operation conditions of batteries in PV applications
Andreas Jossen; Juergen Garche; Dirk Uwe Sauer
2004-01-01
For a continuous energy supply of photovoltaic operated and off-grid loads, the storage of the solar generated electrical energy is necessary. About 60% of all over the world manufactured solar cells are used for such stand alone systems. In case of photovoltaic systems, mainly electrochemical battery storage systems are used.The paper describes the requirements for batteries in solar systems. The
Biosignal operating system for telemedical applications
Radu Leca; Laszlo Osvath; Eva Kettle
1999-01-01
This paper describes the principles and prototype architecture of a biosignal operating system for monitoring, diagnosing and treating diseases online. The distinguishing feature of the system is its ability to interface with the human body in a medically relevant manner. Three units in the system ensure machine-body interoperability. First is a biosignal acquisition and processing unit. The second unit draws
Ceramic matrix composite applications in advanced liquid fuel rocket engine turbomachinery
NASA Technical Reports Server (NTRS)
Brockmeyer, Jerry W.
1992-01-01
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.
Luis R. Gaya-Piqué; Stefka Stefanova; Ward L. Hawkins; Jerry J. Sweeney; Mordechai Melamud; Matjaz Prah
2010-01-01
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
S. Baskar; P. N. Suganthan; N. Q. Ngo; A. Alphones; R. T. Zheng
2006-01-01
The design of triangular fiber Bragg grating (TFBG) filters using covariance matrix adapted evolution strategy (CMAES) algorithm is presented. The TFBG filter can be used as a readout device in FBG-based sensor applications. Two different filter design problems are investigated. The first problem is the design of TFBG filter for a specified bandwidth. The other is maximizing the bandwidth of
Jones, R.H. (Pacific Northwest Lab., Richland, WA (USA)); Lucas, G.E. (California Univ., Santa Barbara, CA (USA))
1990-11-01
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.
Harmonic Loss Due to Operation of Induction Machines From Matrix Converters
Patrick W. Wheeler; Jon C. Clare; Maurice Apap; Keith J. Bradley
2008-01-01
This paper quantifies the extra harmonic losses in an induction motor that are associated with the use of a matrix converter topology as a motor drive. These extra losses are compared to the harmonic losses associated with an inverter-based motor drive. The technique employed in the determination of the harmonic losses is described. For the matrix converter, the extra harmonic
Biosignal operating system for telemedical applications
NASA Astrophysics Data System (ADS)
Leca, Radu; Osvath, Laszlo; Kettle, Eva
1999-07-01
This paper describes the principles and prototype architecture of a biosignal operating system for monitoring, diagnosing and treating diseases online. The distinguishing feature of the system is its ability to interface with the human body in a medically relevant manner. Three units in the system ensure machine-body interoperability. First is a biosignal acquisition and processing unit. The second unit draws conclusions from the acquired information while the third enables non-invasive therapies. The entire operation aims at locating the biological resources available for treatment and gaining access to them at run-time. This eliminates the need for medical records. In addition, a protocol for uniform disease definition eliminates the need for massive databasing and frequent updating. The drawback is that the system requires investigations into the biological resources of communication -- a gray area even in molecular biology. Preliminary tests, however, indicate that our technology supports online delivery of comprehensive medical services over the Internet.
LOCSET Phase Locking: Operation, Diagnostics, and Applications
NASA Astrophysics Data System (ADS)
Pulford, Benjamin N.
The aim of this dissertation is to discuss the theoretical and experimental work recently done with the Locking of Optical Coherence via Single-detector Electronic-frequency Tagging (LOCSET) phase locking technique developed and employed here are AFRL. The primary objectives of this effort are to detail the fundamental operation of the LOCSET phase locking technique, recognize the conditions in which the LOCSET control electronics optimally operate, demonstrate LOCSET phase locking with higher channel counts than ever before, and extend the LOCSET technique to correct for low order, atmospherically induced, phase aberrations introduced to the output of a tiled array of coherently combinable beams. The experimental work performed for this effort resulted in the coherent combination of 32 low power optical beams operating with unprecedented LOCSET phase error performance of lambda/71 RMS in a local loop beam combination configuration. The LOCSET phase locking technique was also successfully extended, for the first time, into an Object In the Loop (OIL) configuration by utilizing light scattered off of a remote object as the optical return signal for the LOCSET phase control electronics. Said LOCSET-OIL technique is capable of correcting for low order phase aberrations caused by atmospheric turbulence disturbances applied across a tiled array output.
NASA Astrophysics Data System (ADS)
Constantinescu, C.; Matei, A.; Ionita, I.; Ion, V.; Marascu, V.; Dinescu, M.; Vasiliu, C.; Emandi, A.
2014-05-01
Azo-dye compounds, in bulk or as thin films, are extensively studied due to their particular optical properties. These properties include non-linear interaction, e.g. two-photon absorption, optical limiting and all-optical poling, with potential applications in optoelectronics and sensors development. Herein, we report on the deposition of pyrazolone derivatives, namely 1-phenyl-3-methyl-4-(1?-azo-2?-sodium carboxylate)-pyrazole-5-one thin films, for applications in second harmonic generation. Matrix-assisted pulsed laser evaporation was employed for layers growth, using a Nd:YAG device operating at 266 nm (4?). The structure and surface morphology of the deposited films were examined by Fourier transform infrared spectroscopy, atomic force microscopy, and scanning electron microscopy. Spectroscopic-ellipsometry was employed to investigate thin film optical properties. Significant second harmonic generation capabilities of the compound were pointed out by using a femtosecond Ti:sapphire laser.
Application of adjoint operators to neural learning
NASA Technical Reports Server (NTRS)
Barhen, J.; Toomarian, N.; Gulati, S.
1990-01-01
A technique for the efficient analytical computation of such parameters of the neural architecture as synaptic weights and neural gain is presented as a single solution of a set of adjoint equations. The learning model discussed concentrates on the adiabatic approximation only. A problem of interest is represented by a system of N coupled equations, and then adjoint operators are introduced. A neural network is formalized as an adaptive dynamical system whose temporal evolution is governed by a set of coupled nonlinear differential equations. An approach based on the minimization of a constrained neuromorphic energylike function is applied, and the complete learning dynamics are obtained as a result of the calculations.
The ‘SAR Matrix’ method and its extensions for applications in medicinal chemistry and chemogenomics
Gupta-Ostermann, Disha; Bajorath, Jürgen
2014-01-01
We describe the ‘Structure-Activity Relationship (SAR) Matrix’ (SARM) methodology that is based upon a special two-step application of the matched molecular pair (MMP) formalism. The SARM method has originally been designed for the extraction, organization, and visualization of compound series and associated SAR information from compound data sets. It has been further developed and adapted for other applications including compound design, activity prediction, library extension, and the navigation of multi-target activity spaces. The SARM approach and its extensions are presented here in context to introduce different types of applications and provide an example for the evolution of a computational methodology in pharmaceutical research. PMID:25383183
The RETOS operating system: kernel, tools and applications
Hojung Cha; Sukwon Choi; Inuk Jung; Hyoseung Kim; Hyojeong Shin; Jaehyun Yoo; Chanmin Yoon
2007-01-01
This demonstration shows the programming development suite of the RETOS operating system for sensor networks, which provides a robust and multithreaded programming interface to application programmers. We first demonstrate how to build the RETOS kernel on the TI MSP430, Atmel ATmega 128 and Chipcon CC2430 family of microcontrollers. The application or a kernel module is then compiled and disseminated, via
Artificial intelligence program in a computer application supporting reactor operations
Stratton, R.C.; Town, G.G.
1985-01-01
Improving nuclear reactor power plant operability is an ever-present concern for the nuclear industry. The definition of plant operability involves a complex interaction of the ideas of reliability, safety, and efficiency. This paper presents observations concerning the issues involved and the benefits derived from the implementation of a computer application which combines traditional computer applications with artificial intelligence (AI) methodologies. A system, the Component Configuration Control System (CCCS), is being installed to support nuclear reactor operations at the Experimental Breeder Reactor II.
Application of AI technology to nuclear plant operations
Sackett, J.I.
1988-01-01
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.
The application of CRM to military operations
NASA Technical Reports Server (NTRS)
Cavanagh, Dale E.; Williams, Kenneth R.
1987-01-01
The detailed content of the CRM training component of the C-5 Aircrew Training System (ATS) was left to the discretion of the contractor. As a part of determining what the content should be, United Airlines Services Corporation has made an effort to understand how the needs of MAC crews compare with those of civilian airline crews. There are distinct similarities between the crew roles in the cockpits of civilian airliners and military air transports. Many of the attitudes and behaviors exhibited by civil and military crew members are comparable, hence much of the training in the field referred to as Cockpit Resource Management (CRM) is equally appropriate to civil or military aircrews. At the same time, there are significant differences which require assessment to determine if modifications to what might be termed generic CRM are necessary. The investigation enabled the definition and specification of CRM training which is believed to address the needs of the C-5 operational community. The study has concentrated largely on military airlift, but the training objectives and course content of the CRM training are readily adaptable to a wider range of military cockpits than are found in strategic airlift. For instance, CRM training focusing on communication, leadership, situational awareness, and crew coordination is just as appropriate, with some modification, to the pilots manning a flight to Tactical Airlift Command A-7's as it is to the pilots, flight engineers, and loadmasters crewing a C-5.
Tensor operators: Constructions and applications for long-range interaction systems
Froewis, F.; Nebendahl, V.; Duer, W. [Institut fuer Theoretische Physik, Universitaet Innsbruck, Technikerstrasse 25, A-6020 Innsbruck (Austria)
2010-06-15
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.
Code of Federal Regulations, 2014 CFR
2014-07-01
... 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...
Code of Federal Regulations, 2013 CFR
2013-07-01
... 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...
Code of Federal Regulations, 2011 CFR
2011-07-01
... 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...
Code of Federal Regulations, 2010 CFR
2010-07-01
... 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...
Code of Federal Regulations, 2012 CFR
2012-07-01
... 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...
Jinsong Yang; Yongge Ma
2015-06-11
To adopt a practical method to calculate the action of geometrical operators on quantum states is a crucial task in loop quantum gravity. In the series of papers, we will introduce a graphical method, developed by Yutsis and Brink, to loop quantum gravity. The graphical method provides a very powerful technique for simplifying complicated calculations. In this first paper, the closed formula of volume operator is derived via the graphical method. By employing suitable and non-ambiguous graphs to represent the acting of operators as well as the spin network states, we use the simple rules for transforming graphs to yield the resulting formula. Comparing with the complicated algebraic derivation in some literatures, our procedure is more concise, intuitive and visual. The resulting matrix elements of volume operator is compact and uniform, fitting for both gauge-invariant and gauge-variant spin network states.
Braziulis, Erik; Diezi, Mirco; Biedermann, Thomas; Pontiggia, Luca; Schmucki, Marlene; Hartmann-Fritsch, Fabienne; Luginbühl, Joachim; Schiestl, Clemens; Meuli, Martin; Reichmann, Ernst
2012-06-01
Tissue engineering of clinically applicable dermo-epidermal skin substitutes is crucially dependent on the three-dimensional extracellular matrix, supporting the biological function of epidermal and dermal cells. This matrix essentially determines the mechanical stability of these substitutes to allow for safe and convenient surgical handling. Collagen type I hydrogels yield excellent biological functionality, but their mechanical weakness and their tendency to contract and degrade does not allow producing clinically applicable transplants of larger sizes. We show here that plastically compressed collagen type I hydrogels can be produced in clinically relevant sizes (7×7?cm), and can be safely and conveniently handled by the surgeon. Most importantly, these dermo-epidermal skin substitutes mature into a near normal skin that can successfully reconstitute full-thickness skin defects in an animal model. PMID:22195768
NASA Technical Reports Server (NTRS)
Hribar, V. F.; Bauer, J. L.; O'Donnell, T. P.
1986-01-01
Five black electrically conductive thermal-control coatings have been formulated and tested for application on the Galileo spacecraft. The coatings consisted of organic and inorganic systems applied on titanium and aluminum surfaces. The coatings were tested under simulated space environment conditions. Coated specimens were subjected to thermal radiation and convective and conductive heating from -196 to 538 C. Mechanical, physical, thermal, electrical, and optical characteristics, formulation, mixing, application, surface preparation of substrates, and a method of determining electrical resistance are presented for the silicone matrix formulation designated as GF-580.
InkTag: Secure Applications on an Untrusted Operating System
Hofmann, Owen S.; Kim, Sangman; Dunn, Alan M.; Lee, Michael Z.; Witchel, Emmett
2014-01-01
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
Applications of Laplace-Beltrami operator for Jack polynomials
Wuxing Cai; Naihuan Jing
2011-05-30
We use a new method to study the Laplace-Beltrami type operator on the Fock space of symmetric functions, and as an example of our explicit computation we show that the Jack symmetric functions are the only family of eigenvectors of the differential operator. As applications of this explicit method we find a combinatorial formula for Jack symmetric functions and the Littlewood-Richardson coefficients in the Jack case. As further applications, we obtain a new determinantal formula for Jack symmetric functions. We also obtained a generalized raising operator formula for Jack symmetric functions, and a formula for the explicit action of Virasoro operators. Special cases of our formulas imply Mimachi-Yamada's result on Jack symmetric functions of rectangular shapes, as well as the explicit formula for Jack functions of two rows or two columns.
InkTag: Secure Applications on an Untrusted Operating System.
Hofmann, Owen S; Kim, Sangman; Dunn, Alan M; Lee, Michael Z; Witchel, Emmett
2013-01-01
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
Starkov, A. S. [St. Petersburg National Research University of Information Technologies, Mechanics and Optics, Institute of Refrigeration and Biotechnology (Russian Federation); Starkov, I. A., E-mail: ferroelectrics@ya.ru [Brno University of Technology, SIX Research Centre (Czech Republic)
2014-11-15
It is proposed to use a generalized matrix averaging (GMA) method for calculating the parameters of an effective medium with physical properties equivalent to those of a set of thin multiferroic layers. This approach obviates the need to solve a complex system of magnetoelectroelasticity equations. The required effective characteristics of a system of multiferroic layers are obtained using only operations with matrices, which significantly simplifies calculations and allows multilayer systems to be described. The proposed approach is applicable to thin-layer systems, in which the total thickness is much less than the system length, radius of curvature, and wavelengths of waves that can propagate in the system (long-wave approximation). Using the GMA method, it is also possible to obtain the effective characteristics of a periodic structure with each period comprising a number of thin multiferroic layers.
NASA Technical Reports Server (NTRS)
Park, Cheol; Wise, Kristopher E.; Kang, Jin Ho; Kim, Jae-Woo; Sauti, Godfrey; Lowther, Sharon E.; Lillehei, Peter T.; Smith, Michael W.; Siochi, Emilie J.; Harrison, Joycelyn S.; Jordan, Kevin
2008-01-01
Multifunctional structural materials can enable a novel design space for advanced aerospace structures. A promising route to multifunctionality is the use of nanotubes possessing the desired combination of properties to enhance the characteristics of structural polymers. Recent nanotube-polymer nanocomposite studies have revealed that these materials have the potential to provide structural integrity as well as sensing and/or actuation capabilities. Judicious selection or modification of the polymer matrix to promote donor acceptor and/or dispersion interactions can improve adhesion at the interface between the nanotubes and the polymer matrix significantly. The effect of nanotube incorporation on the modulus and toughness of the polymer matrix will be presented. Very small loadings of single wall nanotubes in a polyimide matrix yield an effective sensor material that responds to strain, stress, pressure, and temperature. These materials also exhibit significant actuation in response to applied electric fields. The objective of this work is to demonstrate that physical properties of multifunctional material systems can be tailored for specific applications by controlling nanotube treatment (different types of nanotubes), concentration, and degree of alignment.
Apkarian, V. Ara
: Application to iodine in argon matrix Z. Bihary Department of Chemistry, University of California, Irvine be handled computationally. The method is applied to the vibrational matrix-shift of iodine in an argon of the shifts is interpreted in detail, and the properties of the iodineargon interactions essential to obtain
Kwang Soon Lee; Wangyun Won
2007-01-01
Properties and potential applications of the block pulse response circulant matrix (PRCM) and its singular value decomposition (SVD) are investigated in relation to MIMO control and identification. The SVD of the PRCM is found to provide complete directional as well as frequency decomposition of a MIMO system in a real matrix form. Three examples were considered: design of MIMO FIR
Fire protection system operating experience review for fusion applications
Cadwallader, L.C.
1995-12-01
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.
Web Application Software for Ground Operations Planning Database (GOPDb) Management
NASA Technical Reports Server (NTRS)
Lanham, Clifton; Kallner, Shawn; Gernand, Jeffrey
2013-01-01
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.
J. William Helton; Reza Rashidi Far; Roland Speicher
2007-01-01
We show that the quadratic matrix equation $VW + \\\\eta (W)W = I$, for given\\u000a$V$ with positive real part and given analytic mapping $\\\\eta$ with some\\u000apositivity preserving properties, has exactly one solution $W$ with positive\\u000areal part. We point out the relevance of this result in the context of\\u000aoperator-valued free probability theory and for the determination of
Application of a matrix-fracture transfer pseudofunction in geothermal reservoir simulation
Lim, K.T.; Enedy, K.L.; Bloomfield, K.K.; Aziz, K.
1992-01-01
A fine-grid, single porosity model of a matrix-fracture system was used to visualize the pressure response and mass transfer mechanisms in a vapor-dominated geothermal reservoir. The observed pressure response and saturation distributions were used to generate a pseudofunction representing the product of vapor phase relative permeability and matrix-fracture transfer shape factor for a dual-porosity model. The pseudofunction was found to be a function of vapor saturation. It was used in place of the gas relative permeability curve. With the application of the pseudofunction, the dual-porosity model produced pressure decline trends similar to those observed in the fine-grid models. The pseudofunction approach was successfully applied in the history matching of a single Geysers producing well. The TETRAD simulation code was used in this study.
Overall mechanical properties of fiber-reinforced metal matrix composites for fusion applications
NASA Astrophysics Data System (ADS)
You, J. H.; Bolt, H.
2002-09-01
The high-temperature strength and creep properties are among the crucial criteria for the structural materials of plasma facing components (PFC) of fusion reactors, as they will be subjected to severe thermal stresses. The fiber-reinforced metal matrix composites are a potential heat sink material for the PFC application, since the combination of different material properties can lead to versatile performances. In this article, the overall mechanical properties of two model composites based on theoretical predictions are presented. The matrix materials considered were a precipitation hardened CuCrZr alloy and reduced activation martensitic steel `Eurofer'. Continuous SiC fibers were used for the reinforcement. The results demonstrate that yield stress, ultimate tensile strength, work hardening rate and creep resistance could be extensively improved by the fiber reinforcement up to fiber content of 40 vol.%. The influence of the residual stresses on the plastic behavior of the composites is also discussed.
Application of the maturity method in slipforming operations
Christos Anagnostopoulos
2003-01-01
The main objective of this thesis is to study the application of the maturity method in slipforming operations so as to provide more efficient means of the construction planning of a project. The main target of this research is to use the maturity method to establish the initial setting times and then apply those times to estimate the slipform mockup
Operation of lead-acid batteries for HEV applications
J. B. Olson; E. D. Sexton
2000-01-01
Hybrid electric vehicles (HEV) are approaching commercial realization, many using advanced high power, lead-acid batteries. The HEV application is quite challenging due to the high currents going to and from the batteries. Although cycle efficiencies of thin plate lead-acid batteries are as high or better than other available power sources, the heat generated by HEV mode operation is not a
Autonomous Robots in SWAT Applications: Research, Design, and Operations Challenges
Autonomous Robots in SWAT Applications: Research, Design, and Operations Challenges Mr. Henry L), 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
Re) Configurable Real-Time Operating Systems and Their Applications
Carsten Böke; Marcelo Götz; Tales Heimfarth; Dania El Kebbe; Franz J. Rammig; Sabina Rips
2003-01-01
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
Ziavras, Sotirios G.
. Our HERA (HEterogeneous Reconfigurable Architecture) machine can implement the SIMD (Single mixed-mode parallelism for matrix operations on the HERA architecture through reconfiguration Xiaofang of resource reconfiguration. In contrast to the majority of the FPGA community that still employs
Polynorbornene as a low loss matrix material for IR metamaterial applications.
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
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.
Development of damped metal-matrix composites for advanced structural applications. Technical report
Updike, C.A.; Bhagat, R.B.
1990-04-01
The development of damped metal matrix composite structures for advanced applications has been investigated by the use of two different approaches: (1) the development of metal matrix composites with high intrinsic damping compared to that of the matrix material, and (2) the development of coated metal matrix composites with high structural damping compared to that of the composite substrates. The two different approaches are analyzed in terms of their potential for improved damping and feasibility for structural applications. Damping was measured by the transverse vibration of free-free beams using the bandwidth technique by a laser vibrometer under ambient conditions. The damping measurements were made over a wide range of frequencies (.7 kHz to 25.6 kHz) at low strain amplitudes (10 to the -10 power to 10 to the -7 power). Materials investigated for their tensile stiffness, strength, and damping performance include mechanically alloyed (MA) Aluminum-Magnesium, SiC(p)/Aluminum-Copper (MA), SiC(p)/AL, AL2O3(p)/AL, SiC(W)/AL, planar random Gr/AL, unidirectional Gr/AL and unidirectional SiC(Nicalon)/AL composites. The effects of coatings of high damping metals (nitinol and incramute) on 6061-T6 AL and AL2O3(p)/AL substrates have also been studied. The AL-Mg (MA), SiC(p)/AL (MA), SiC(W)/AL and th AL2O3(p)/AL composites show no significant improvement in damping compared with that of the 6061-T6 AL.
Shin, Sang-Chul; Choi, Jun-Shik
2005-09-01
The bioavailability of triprolidine from the ethylene vinyl acetate (EVA) matrix system containing polyoxyethylene-2-oleyl ether was studied to determine the feasibility of enhanced transdermal delivery of triprolidine in rabbits. The antihistamine effects were also confirmed to determine the percutaneous absorption of triprolidine from the EVA matrix system containing a penetration enhancer and plasticizer in rats. The triprolidine-EVA matrix (50mg/kg) was applied to the abdominal skin of rabbits. Blood samples were collected via the femoral artery for 36 h and the plasma concentrations of triprolidine were determined by HPLC. The pharmacokinetic parameters were calculated using the LAGRAN computer program. The area under the curve(AUC) was significantly higher in the enhancer group (4582+/-1456 ng/mL h) than that (2958+/-997 ng/mL h) in the control group (P<0.05), showing an approximate 155% increased bioavailability. The average Cmax in the enhancer group (241+/-46.5 ng/mL) was significantly higher than that in the control group (198+/-28.9 ng/mL), (P<0.05). The mean Tmax in the enhancer group (8.0+/-2.57 h) was higher than that in the control group (6.0+/-2.24 h, but this was not statistically significantly. The relative bioavailability of triprolidine in the transdermal application was 35.9% in the control group and 55.6% in the enhancer group compared comparing with that after oral administration. As the triprolidine-EVA matrix, which contains polyoxyethylene-2-oleyl ether as an enhancer and triethyl citrate as a plasticizer was administered to the rabbits via the transdermal routes, the relative bioavailability increased approximately 1.55 fold compared with that in the control group, showing a relatively constant, sustained blood concentration with minimal fluctuation. The antihistamine effect was determined using the Evans blue dye procedure by comparing the changes in the vascular permeability increase following the transdermal application. The vascular permeability increase was reduced significantly by the transdermal application of the EVA-triprolidine system containing triethyl citrate and polyoxyethylene-2-oleyl ether. These results show that the plasticizer and penetration enhancer increase the skin permeation of triprolidine and the triprolidine-EVA matrix system could be developed as a transdermal delivery system providing the increased constant plasma concentration and antihistamine effects. PMID:16005195
Marcus Gaul; Carlo Rovelli
2001-03-08
We study a generalized version of the Hamiltonian constraint operator in nonperturbative loop quantum gravity. The generalization is based on admitting arbitrary irreducible SU(2) representations in the regularization of the operator, in contrast to the original definition where only the fundamental representation is taken. This leads to a quantization ambiguity and to a family of operators with the same classical limit. We calculate the action of the Euclidean part of the generalized Hamiltonian constraint on trivalent states, using the graphical notation of Temperley-Lieb recoupling theory. We discuss the relation between this generalization of the Hamiltonian constraint and crossing symmetry.
Novel ceramic-matrix composites for deep-submergence pressure-vessel applications. Final report
Stachiw, J.D.; Henderson, T.J.; Anderson, C.A.
1991-10-01
Novel ceramic matrix composite tubes for deep submergence pressure vessel applications have been fabricated by the DIMOX directed metal oxidation process. These silicon carbides/aluminum oxides composite tubes have an eight percent lower weight to displacement ratio, approximately five times greater thermal conductivity, and more than 50% higher fracture toughness than a tube fabricated from alumina ceramics. Additionally, the SiC/Al2O3 composite tubes have a sixty percent lower weight to displacement ratio and a 12 times greater thermal conductivity than titanium--gallium--4 vanadium alloy tubes. Processing information, hydrostatic implosion test results, and mechanical test data will be discussed.
NASA Astrophysics Data System (ADS)
Abkowitz, Stanley; Abkowitz, Susan M.; Fisher, Harvey; Schwartz, Patricia J.
2004-05-01
Advanced powder-metallurgy technology has led to the development of the CermeTi® family of titanium metalmatrix composites. Reinforcing the titanium alloy matrix with titanium carbide or titanium boride particles results in superior properties. These discontinuously reinforced titanium composites have excellent room- and elevated-temperature properties and are exceptionally wear resistant. High quality, near-net shape CermeTi composite components are being produced commercially and are being evaluated for potential applications in military vehicles, commercial automotive engines, sporting goods, industrial tooling, and biomedical devices.
NASA Astrophysics Data System (ADS)
Rasheed, A.; Khalid, F. A.
2014-06-01
The polymeric matrix composites have found extensive applications in sports because of high strength to weight ratio, ease of processing, and longer life. This work was carried out to study the properties of different sections of composite field hockey sticks and the influence of carbon nanotubes on their properties. The samples were fabricated by compression molding process. The increase in mechanical properties by the incorporation of carbon nanotubes is correlated with the process parameters to consider enhancement in the overall performance of the stick sections.
47 CFR 90.137 - Applications for operation at temporary locations.
Code of Federal Regulations, 2010 CFR
2010-10-01
...2010-10-01 2010-10-01 false Applications for operation at temporary locations...SPECIAL RADIO SERVICES PRIVATE LAND MOBILE RADIO SERVICES Applications and Authorizations § 90.137 Applications for operation at temporary...
Fujimoto, Hiroshi
TER-06-25 SPC-06-72 Application of Matrix Converter to Low-Voltage and Large-Current DC Power of Technology) This paper describes an application of a matrix converter to a 13-V and 2500-A DC power supply, using a 15-kHz transformer coupling. The matrix converter generates 15 kHz single-phase current
Cryogenic system operating experience review for fusion applications
Cadwallader, L.C.
1992-01-01
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.
Ellingson, W. A.
1999-05-21
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.
Larsen, J.M.; Russ, S.M. [Wright Lab., Wright-Patterson AFB, OH (United States). Materials Directorate; Jones, J.W. [Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
1995-12-01
The current capabilities of continuous silicon-carbide fiber-reinforced titanium matrix composites (TMCs) are reviewed with respect to application needs and compared to the capabilities of conventional high-temperature monolithic alloys and aluminides. In particular, the properties of a first-generation titanium aluminide composite, SCS-6/Ti-24Al-11Nb, and a second-generation metastable beta alloy composite, SCS-6/TIMETAL 21S, are compared with the nickel-base superalloy IN100, the high-temperature titanium alloy Ti-1100, and a relatively new titanium aluminide alloy. Emphasis is given to life-limiting cyclic and monotonic properties and to the influence of time-dependent deformation and environmental effects on these properties. The composite materials offer a wide range of performance capabilities, depending on laminate architecture. In many instances, unidirectional composites exhibit outstanding properties, although the same materials loaded transverse to the fiber direction typically exhibit very poor properties, primarily due to the weak fiber/matrix interface. Depending on the specific mechanical property under consideration, composite cross-ply laminates often show no improvement over the capability of conventional monolithic materials. Thus, it is essential that these composite materials be tailored to achieve a balance of properties suitable to the specific application needs if these materials are to be attractive candidates to replace more conventional materials.
Response of microscale cell/matrix constructs to successive force application in a 3D environment
NASA Astrophysics Data System (ADS)
Liu, Alan; Chen, Christopher; Reich, Daniel
2014-03-01
Mechanical dilation of arteries by pulsatile blood flow is directly opposed by coordinated contraction of a band of smooth muscle tissue that envelops the vessels. This mechanical adaptation of smooth muscle cells to external loading is a critical feature of normal blood vessel function. While most previous studies on biomechanical systems have focused on single cells or large excised tissue, we utilize a device to apply forces to engineered smooth muscle microtissues. This device consists of arrayed pairs of elastomeric micro-cantilevers capable of magnetic actuation. Tissues are formed through self-assembly following the introduction of cell-infused collagen gel to the array. With this system, we are able to dynamically stretch and relax these sub-millimeter sized tissues. The timing and magnitude of the force application can be precisely controlled and thus can be used to mimic a wide range of physiological behavior. In particular, we will discuss results that show that the interval between successive force applications mediates the both the subsequent mechanical and active dynamics of the cell/matrix composite system. Understanding this process will lead to better understanding of the interplay between cell and extracellular matrix responses to mechanical stimulus at a novel length scale.
Generalized complement operators and applications in some semirings
Bijev, G. [Technical University of Sofia, 8, Kl.Ohridski Blvd, 1000 Sofia (Bulgaria)
2013-12-18
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.
Søren Asmussen; Colm Art Ocinneide
1998-01-01
Neuts has shown that a Markov chain of GI\\/M\\/1 type has a matrix-geometric steady-state distribution, extending earlier work by Evans [13] and Wallace [31]. Various authors later observed that, under this steady-state distribution, the “level” component is phase type. We give a probabilistic interpretation of this result by constructing, from a sample path of the original process, a Markov chain
Application of solid state lighting in aerial refueling operations
NASA Astrophysics Data System (ADS)
Mangum, Scott; Singer, Jeffrey; Walker, Richard; Ferguson, Joseph; Kemp, Richard
2005-09-01
Operating at altitude and often in turbulent, low visibility conditions, in-flight refueling of aircraft is a challenging endeavor, even for seasoned aviators. The receiving aircraft must approach a large airborne tanker; take position within a "reception window" beneath and/or behind the tanker and, dependent upon the type of receiving aircraft, mate with an extended refueling boom or hose and drogue. Light is used to assist in the approach, alignment and refuel process of the aircraft. Robust solid state light emitting diodes (LEDs) are an appropriate choice for use in the challenging environments that these aircraft operate within. This paper examines how LEDs are incorporated into several unique lighting applications associated with such aerial refueling operations. We will discuss the design requirements, both environmental and photometric that defined the selection of different LED packages for use in state-of-the-art airborne refueling aircraft Formation Lights, Hose Drum/Drogue Unit lights and Pilot Director Lights.
Ventilation Systems Operating Experience Review for Fusion Applications
Cadwallader, Lee Charles
1999-12-01
This report is a collection and review of system operation and failure experiences for air ventilation systems in nuclear facilities. These experiences are applicable for magnetic and inertial fusion facilities since air ventilation systems are support systems that can be considered generic to nuclear facilities. The report contains descriptions of ventilation system components, operating experiences with these systems, component failure rates, and component repair times. Since ventilation systems have a role in mitigating accident releases in nuclear facilities, these data are useful in safety analysis and risk assessment of public safety. An effort has also been given to identifying any safety issues with personnel operating or maintaining ventilation systems. Finally, the recommended failure data were compared to an independent data set to determine the accuracy of individual values. This comparison is useful for the International Energy Agency task on fusion component failure rate data collection.
NASA Astrophysics Data System (ADS)
Rudowicz, C.; Chung, C. Y.
2004-08-01
Spherical (S) and tesseral (T) tensor operators (TOs) have been extensively used in, for example, EMR and optical spectroscopy of transition ions. To enable a systematic review of the published tables of the operators and their matrix elements (MEs) we have generated the relevant tables by computer, using Mathematica programs. Our review reveals several misprints/errors in the major sources of TTOs—the conventional Stevens operators (CSOs—components q\\ge 0 ) and the extended ones (ESOs—all q) for rank k = 2,4, and 6—as well as of some STOs with k\\le 8 . The implications of using incorrect operators and/or MEs for the reliability of EMR-related programs and interpretation of experimental data are discussed. Studies of high-spin complexes like Mn12 (S = 10) and Fe19 (S = 33/2) require operator and ME listings up to k = 2S, which are not presently available. Using the algorithms developed recently by Ryabov, the generalized ESOs and their MEs for arbitrary rank k and spin S are generated by computer, using Mathematica. The extended tables enable simulation of the energy levels for arbitrary spin systems and symmetry cases. Tables are provided for the ESOs not available in the literature, with odd k = 3,5, and 7 for completeness; however, for the newly generalized ESOs with the most useful even rank k = 8,10, and 12 only, in view of the large listings sizes. General source codes for the generation of the ESO listings and their ME tables are available from the authors.
NASA Astrophysics Data System (ADS)
Haslam, Jeffery John
1998-12-01
The need for improved fuel economy and reduced environmental emissions from power turbines has prompted the development of high temperature fiber composite materials. One use of these materials is for liners of the hot combustion regions of jet engines and land based power turbines. Stability of the composite materials against oxidative damage during long term use at high temperatures has motivated recent research into fiber composite materials composed entirely of oxide ceramics. All-oxide fiber reinforced composites containing porous, strongly bonded matrices have become of interest. The porosity provides for crack deflection along the fibers to prevent catastrophic failure of the fiber reinforcements. A new application of a processing method that produces evaporation/condensation sintering was employed to prevent shrinkage of the matrix. This processing method and the properties of the matrix, fibers, and composite were evaluated in this work. Producing a matrix without shrinkage is important to prevent undesirable crack-like voids from forming in the matrix. These voids are caused by constraint against shrinkage by the fiber reinforcements. Dry hydrogen chloride gas produced a reactive gas atmosphere that was used to sinter the zirconia particles with minimal shrinkage because the gas promotes evaporation/condensation sintering with zirconia. Sintering of samples that did not contain fiber reinforcements was studied to evaluate the properties of the matrix material. The sintering of monoclinic, tetragonal, and cubic zirconias in the reactive gas atmosphere was compared. Additions of mullite (which did not sinter significantly at processing temperatures) further reduced the shrinkage. The effects of the processing conditions on the sintering shrinkage, microstructure development, and mechanical properties were studied. Cubic and monoclinic zirconia coarsened significantly in the HCl gas sintering atmosphere. The coarsening of the particles during the sintering process produced a porous material that was resistant to densification when heat treated in air. Tetragonal zirconia did not coarsen due to an agglomerated microstructure. The mechanical properties generally followed a volume weighted rule of mixtures relationship with the quantity of zirconia. The effect of the sintering atmosphere on fiber properties and the mechanical properties of a fiber reinforced composite produced by this approach were also presented.
Hewett, P. L., Jr.; Mitrani, J. E.; Metz, W. C.; Vercellone, J. J.; Decision and Information Sciences
2001-11-01
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.
Peters, Frank T; Remane, Daniela
2012-06-01
In the last decade, liquid chromatography coupled to (tandem) mass spectrometry (LC-MS(-MS)) has become a versatile technique with many routine applications in clinical and forensic toxicology. However, it is well-known that ionization in LC-MS(-MS) is prone to so-called matrix effects, i.e., alteration in response due to the presence of co-eluting compounds that may increase (ion enhancement) or reduce (ion suppression) ionization of the analyte. Since the first reports on such matrix effects, numerous papers have been published on this matter and the subject has been reviewed several times. However, none of the existing reviews has specifically addressed aspects of matrix effects of particular interest and relevance to clinical and forensic toxicology, for example matrix effects in methods for multi-analyte or systematic toxicological analysis or matrix effects in (alternative) matrices almost exclusively analyzed in clinical and forensic toxicology, for example meconium, hair, oral fluid, or decomposed samples in postmortem toxicology. This review article will therefore focus on these issues, critically discussing experiments and results of matrix effects in LC-MS(-MS) applications in clinical and forensic toxicology. Moreover, it provides guidance on performance of studies on matrix effects in LC-MS(-MS) procedures in systematic toxicological analysis and postmortem toxicology. PMID:22549818
NASA Astrophysics Data System (ADS)
Bhrawy, A. H.; Doha, E. H.; Baleanu, D.; Ezz-Eldien, S. S.
2015-07-01
In this paper, an efficient and accurate spectral numerical method is presented for solving second-, fourth-order fractional diffusion-wave equations and fractional wave equations with damping. The proposed method is based on Jacobi tau spectral procedure together with the Jacobi operational matrix for fractional integrals, described in the Riemann-Liouville sense. The main characteristic behind this approach is to reduce such problems to those of solving systems of algebraic equations in the unknown expansion coefficients of the sought-for spectral approximations. The validity and effectiveness of the method are demonstrated by solving five numerical examples. Numerical examples are presented in the form of tables and graphs to make comparisons with the results obtained by other methods and with the exact solutions more easier.
Application of acellular dermal matrix for intestinal elongation in animal models
Xu, Hui-Min; Wang, Zhen-Jun; Han, Jia-Gang; Ma, Hua-Chong; Zhao, Bo; Zhao, Bao-Cheng
2010-01-01
AIM: To investigate the efficacy of acellular dermal matrix (ADM) for intestinal elongation in animal models. METHODS: Japanese white big-ear rabbits (n = 9) and Wuzhishan miniature pigs (n = 5) were used in the study. Home-made and commercial ADM materials were used as grafts, respectively. A 3-cm long graft was interposed in continuity with the small bowel and a side-to-side anastomosis, distal to the graft about 3-4 cm, was performed. The animals were sacrificed at 2 wk, 4 wk, 8 wk and 3 mo after surgery and the histological changes were evaluated under light microscope and electron microscope. RESULTS: The animals survived after the operation with no evidence of peritonitis and sepsis. Severe adhesions were found between the graft and surrounding intestine. The grafts were completely absorbed within postoperative two or three months except one. Histological observation showed inflammation in the grafts with fibrinoid necroses, infiltration of a large amount of neutrophils and leukomonocytes, and the degree varied in different stages. The neointestine with well-formed structures was not observed in the study. CONCLUSION: It is not suitable to use acellular dermal matrix alone as a scaffold for the intestinal elongation in animal models. PMID:20419841
Bannwart, Flávio C; Penelet, Guillaume; Lotton, Pierrick; Dalmont, Jean-Pierre
2013-05-01
The successful design of a thermoacoustic engine depends on the appropriate description of the processes involved inside the thermoacoustic core (TAC). This is a difficult task when considering the complexity of both the heat transfer phenomena and the geometry of the porous material wherein the thermoacoustic amplification process occurs. An attempt to getting round this difficulty consists in measuring the TAC transfer matrix under various heating conditions, the measured transfer matrices being exploited afterward into analytical models describing the complete apparatus. In this paper, a method based on impedance measurements is put forward, which allows the accurate measurement of the TAC transfer matrix, contrarily to the classical two-load method. Four different materials are tested, each one playing as the porous element allotted inside the TAC, which is submitted to different temperature gradients to promote thermoacoustic amplification. The experimental results are applied to the modeling of basic standing-wave and traveling-wave engines, allowing the prediction of the engine operating frequency and thermoacoustic amplification gain, as well as the optimum choice of the components surrounding the TAC. PMID:23654373
Santhakumar, Rajalakshmi; Vidyasekar, Prasanna; Verma, Rama Shanker
2014-01-01
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
Ellis, D.L.
1992-08-01
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.
A matrix-form GSM-CFD solver for incompressible fluids and its application to hemodynamics
NASA Astrophysics Data System (ADS)
Yao, Jianyao; Liu, G. R.
2014-10-01
A GSM-CFD solver for incompressible flows is developed based on the gradient smoothing method (GSM). A matrix-form algorithm and corresponding data structure for GSM are devised to efficiently approximate the spatial gradients of field variables using the gradient smoothing operation. The calculated gradient values on various test fields show that the proposed GSM is capable of exactly reproducing linear field and of second order accuracy on all kinds of meshes. It is found that the GSM is much more robust to mesh deformation and therefore more suitable for problems with complicated geometries. Integrated with the artificial compressibility approach, the GSM is extended to solve the incompressible flows. As an example, the flow simulation of carotid bifurcation is carried out to show the effectiveness of the proposed GSM-CFD solver. The blood is modeled as incompressible Newtonian fluid and the vessel is treated as rigid wall in this paper.
Ravindran, Sriram; Huang, Chun-Chieh; George, Anne
2014-01-01
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
Real-time stereoscopic applications using the goes operational satellites
NASA Astrophysics Data System (ADS)
Mosher, F. R.; Young, J. T.
We have investigated the use of real and synthetic stereo satellite images and stereo graphics in applications such as cloud-tracked winds, severe storm cloud analysis, and general meteorological interpretation. We have concluded that a stereo meteorological presentation is possible and desirable in an operational environment. Synthetic stereo could be used immediately in cloud-tracked wind operations. The presentation allows one to appreciate the interrelations between cloud motions and cloud structures, especially in multi-layered situations. Reprocessing of FGGE tropical wind sets with a synthetic stereo presentation showed some improved yields of low-level vectors, a significant increase in mid-level vectors, and very little change in the high-level vectors. Severe local storm real-stereo presentations are possible operationally because the 15 minute RISOP operations of GOES-East allow simultaneous scanning of both geosynchronous satellites twice per hour. The real-stereo height measurements of overshooting turrets are an improvement over infrared heights and can be used to monitor the strength of the thunderstorm updraft. Synthetic stereo presentations of thunderstorm tops can be presented in a non-linear fashion which stretches out the cloud top features. The synthetic stereo presentation is easier for most people to see. We recommend the use of a hybrid system where the viewing is done on the synthetic stereo image and the quantitative measurements are done on the real-stereo pairs.
Fernando Quijandría; Juan José García-Ripoll; David Zueco
2014-09-16
A way of constructing continuous matrix product states (cMPS) for coupled fields is presented here. The cMPS is a variational \\emph{ansatz} for the ground state of quantum field theories in one dimension. Our proposed scheme is based in the 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.
SiC/SiC Ceramic Matrix Composites Developed for High-Temperature Space Transportation Applications
NASA Technical Reports Server (NTRS)
Kiser, J. Douglas; Bhatt, Ramakrishna, T.; Morscher, Gregory N.; Yun, Hee Mann; DiCarlo, James A.; Petko, Jeanne F.
2005-01-01
Researchers at the NASA Glenn Research Center have been developing durable, high-temperature ceramic matrix composites (CMCs) with silicon carbide (SiC) matrices and SiC or carbon fibers for use in advanced reusable launch vehicle propulsion and airframe applications in the Next Generation Launch Technology (NGLT) Program. These CMCs weigh less and are more durable than competing metallic alloys, and they are tougher than silicon-based monolithic ceramics. Because of their high specific strength and durability at high temperatures, CMCs such as C/SiC (carbon- fiber-reinforced silicon carbide) and SiC/SiC (silicon-carbide-fiber-reinforced silicon carbide) may increase vehicle performance and safety significantly and reduce the cost of transporting payloads to orbit.
High Strain-Rate Mechanical Behaviour of a Copper Matrix Composite for Nuclear Applications
Peroni, L
2012-01-01
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...
Arbitrarily Applicable Comparative Relations: Experimental Evidence for a Relational Operant
Berens, Nicholas M; Hayes, Steven C
2007-01-01
Arbitrarily applicable derived relational responding has been argued by relational frame theorists to be a form of operant behavior. The present study examined this idea with 4 female participants, ages 4 to 5?years old, who could not perform a series of problem-solving tasks involving arbitrary more than and less than relations. In a combined multiple baseline (across responses and participants) and multiple probe design (with trained and untrained stimuli), it was shown that reinforced multiple-exemplar training facilitated the development of arbitrary comparative relations, and that these skills generalized not just across stimuli but also across trial types. The sequence of training identified potential prerequisites in the development of comparative relations (e.g., nonarbitrary comparative relations). Taken as a whole, the present data, along with previous work by others in this area, suggest that relating arbitrary events comparatively is an operant. The implications of this conclusion for the analysis of complex behavior are discussed. PMID:17471793
Vacuum system operating experience review for fusion applications
Cadwallader, L.C.
1994-03-01
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.
U.S. Forward Operating Base Applications of Nuclear Power
Dr. George Griffith
2015-01-01
Nuclear power was demonstrated and made practical so that it could support the military mission of powering ships and submarines. The critical mission benefits of almost unlimited air and fuel-independent power on submarines helped spur development of the nuclear power technology that still forms the basis for the modern nuclear power industry.i Potential production of large amounts of power with low-fuel volume inputs attracted military interest shortly after nuclear power was proven to be viable.ii The expected benefit of nuclear power plants at a forward operating base (FOB) is a significant reduction in the operational and transportation risks and cost required to power FOBs. The reduction in fuel and water volumes that need to be transported is viewed as particularly valuable during war time, when mission capability and reducing enemy exposure is considered much more important than cost. Paper reviews current reactor experience and previous small military reactor applications.
Application of human error analysis to aviation and space operations
Nelson, W.R.
1998-03-01
For the past several years at the Idaho National Engineering and Environmental Laboratory (INEEL) the authors have been working to apply methods of human error analysis to the design of complex systems. They have focused on adapting human reliability analysis (HRA) methods that were developed for Probabilistic Safety Assessment (PSA) for application to system design. They are developing methods so that human errors can be systematically identified during system design, the potential consequences of each error can be assessed, and potential corrective actions (e.g. changes to system design or procedures) can be identified. The primary vehicle the authors have used to develop and apply these methods has been a series of projects sponsored by the National Aeronautics and Space Administration (NASA) to apply human error analysis to aviation operations. They are currently adapting their methods and tools of human error analysis to the domain of air traffic management (ATM) systems. Under the NASA-sponsored Advanced Air Traffic Technologies (AATT) program they are working to address issues of human reliability in the design of ATM systems to support the development of a free flight environment for commercial air traffic in the US. They are also currently testing the application of their human error analysis approach for space flight operations. They have developed a simplified model of the critical habitability functions for the space station Mir, and have used this model to assess the affects of system failures and human errors that have occurred in the wake of the collision incident last year. They are developing an approach so that lessons learned from Mir operations can be systematically applied to design and operation of long-term space missions such as the International Space Station (ISS) and the manned Mars mission.
NASA Astrophysics Data System (ADS)
Bassetto, Antonio; Griguolo, Luca; Pucci, Fabrizio; Seminara, Domenico; Thambyahpillai, Shiyamala; Young, Donovan
2009-08-01
We study the correlators of a recently discovered family of BPS Wilson loops in Script N = 4 supersymmetric U(N) Yang-Mills theory. When the contours lie on a two-sphere in the space-time, we propose a closed expression that is valid for all values of the coupling constant g and for any rank N, by exploiting the suspected relation with two-dimensional gauge theories. We check this formula perturbatively at order Script O(g4) for two latitude Wilson loops and we show that, in the limit where one of the loops shrinks to a point, logarithmic corrections in the shrinking radius are absent at Script O(g6). This last result strongly supports the validity of our general expression and suggests the existence of a peculiar protected local operator arising in the OPE of the Wilson loop. At strong coupling we compare our result to the string dual of the Script N = 4 SYM correlator in the limit of large separation, presenting some preliminary evidence for the agreement.
43 CFR 23.4 - Application for permission to conduct exploration operations.
Code of Federal Regulations, 2011 CFR
2011-10-01
...Application for permission to conduct exploration operations. 23.4 Section 23...the Secretary of the Interior SURFACE EXPLORATION, MINING AND RECLAMATION OF LANDS ...Application for permission to conduct exploration operations. No person...
43 CFR 23.4 - Application for permission to conduct exploration operations.
Code of Federal Regulations, 2010 CFR
2010-10-01
...Application for permission to conduct exploration operations. 23.4 Section 23...the Secretary of the Interior SURFACE EXPLORATION, MINING AND RECLAMATION OF LANDS ...Application for permission to conduct exploration operations. No person...
43 CFR 23.4 - Application for permission to conduct exploration operations.
Code of Federal Regulations, 2014 CFR
2014-10-01
...Application for permission to conduct exploration operations. 23.4 Section 23...the Secretary of the Interior SURFACE EXPLORATION, MINING AND RECLAMATION OF LANDS ...Application for permission to conduct exploration operations. No person...
43 CFR 23.4 - Application for permission to conduct exploration operations.
Code of Federal Regulations, 2012 CFR
2012-10-01
...Application for permission to conduct exploration operations. 23.4 Section 23...the Secretary of the Interior SURFACE EXPLORATION, MINING AND RECLAMATION OF LANDS ...Application for permission to conduct exploration operations. No person...
43 CFR 23.4 - Application for permission to conduct exploration operations.
Code of Federal Regulations, 2013 CFR
2013-10-01
...Application for permission to conduct exploration operations. 23.4 Section 23...the Secretary of the Interior SURFACE EXPLORATION, MINING AND RECLAMATION OF LANDS ...Application for permission to conduct exploration operations. No person...
Evaluation of Ceramic Matrix Composite Technology for Aircraft Turbine Engine Applications
NASA Technical Reports Server (NTRS)
Halbig, Michael C.; Jaskowiak, Martha H.; Kiser, James D.; Zhu, Dongming
2013-01-01
The goals of the NASA Environmentally Responsible Aviation (ERA) Project are to reduce the NO(x) emissions, fuel burn, and noise from turbine engines. In order to help meet these goals, commercially-produced ceramic matrix composite (CMC) components and environmental barrier coatings (EBCs) are being evaluated as parts and panels. The components include a CMC combustor liner, a CMC high pressure turbine vane, and a CMC exhaust nozzle as well as advanced EBCs that are tailored to the operating conditions of the CMC combustor and vane. The CMC combustor (w/EBC) could provide 2700 F temperature capability with less component cooling requirements to allow for more efficient combustion and reductions in NOx emissions. The CMC vane (w/EBC) will also have temperature capability up to 2700 F and allow for reduced fuel burn. The CMC mixer nozzle will offer reduced weight and improved mixing efficiency to provide reduced fuel burn. The main objectives are to evaluate the manufacturability of the complex-shaped components and to evaluate their performance under simulated engine operating conditions. Progress in CMC component fabrication, evaluation, and testing is presented in which the goal is to advance from the proof of concept validation (TRL 3) to a system/subsystem or prototype demonstration in a relevant environment (TRL 6).
Devarajan, Karthik
Nonnegative matrix factorization (NMF) by the multiplicative updates algorithm is a powerful machine learning method for decomposing a high-dimensional nonnegative matrix V into two nonnegative matrices, W and H, where V ...
Operational and design aspects of accelerators for medical applications
NASA Astrophysics Data System (ADS)
Schippers, Jacobus Maarten; Seidel, Mike
2015-03-01
Originally, the typical particle accelerators as well as their associated beam transport equipment were designed for particle and nuclear physics research and applications in isotope production. In the past few decades, such accelerators and related equipment have also been applied for medical use. This can be in the original physics laboratory environment, but for the past 20 years also in hospital-based or purely clinical environments for particle therapy. The most important specific requirements of accelerators for radiation therapy with protons or ions will be discussed. The focus will be on accelerator design, operational, and formal aspects. We will discuss the special requirements to reach a high reliability for patient treatments as well as an accurate delivery of the dose at the correct position in the patient using modern techniques like pencil beam scanning. It will be shown that the technical requirements, safety aspects, and required reliability of the accelerated beam differ substantially from those in a nuclear physics laboratory. It will be shown that this difference has significant implications on the safety and interlock systems. The operation of such a medical facility should be possible by nonaccelerator specialists at different operating sites (treatment rooms). The organization and role of the control and interlock systems can be considered as being the most crucially important issue, and therefore a special, dedicated design is absolutely necessary in a facility providing particle therapy.
Analysis operator learning and its application to image reconstruction.
Hawe, Simon; Kleinsteuber, Martin; Diepold, Klaus
2013-06-01
Exploiting a priori known structural information lies at the core of many image reconstruction methods that can be stated as inverse problems. The synthesis model, which assumes that images can be decomposed into a linear combination of very few atoms of some dictionary, is now a well established tool for the design of image reconstruction algorithms. An interesting alternative is the analysis model, where the signal is multiplied by an analysis operator and the outcome is assumed to be sparse. This approach has only recently gained increasing interest. The quality of reconstruction methods based on an analysis model severely depends on the right choice of the suitable operator. In this paper, we present an algorithm for learning an analysis operator from training images. Our method is based on l(p)-norm minimization on the set of full rank matrices with normalized columns. We carefully introduce the employed conjugate gradient method on manifolds, and explain the underlying geometry of the constraints. Moreover, we compare our approach to state-of-the-art methods for image denoising, inpainting, and single image super-resolution. Our numerical results show competitive performance of our general approach in all presented applications compared to the specialized state-of-the-art techniques. PMID:23412611
Exokernel: an operating system architecture for application-level resource management
Dawson R. Engler; M. Frans Kaashoek; James O'Toole Jr
1995-01-01
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
Sparsing of information matrix for practical application of a robot's SLAM
Haiwei Dong; Zhiwei Luo; Weidong Chen
2009-01-01
Mobile robot could navigate in unknown environment autonomously with the help of simultaneous localization and mapping (SLAM). Recently, SLAM based on information matrix enjoys much popularity since it is naturally sparse. However, the computational burden related to information matrix balloons with respect to the increase of the mapped landmarks. In this paper, by considering the features of information matrix, we
N. Simaan; M. Shoham
2003-01-01
This paper presents a closed-form formulation and geometrical interpretation of the derivatives of the Jacobian matrix of fully parallel robots with respect to the moving platforms' position\\/orientation variables. Similar to the Jacobian matrix, these derivatives are proven to be also groups of lines that together with the lines of the instantaneous direct kinematics matrix govern the singularities of the active
Matrix-based system reliability method and applications to bridge networks
Won-Hee Kang; Junho Song; Paolo Gardoni
2008-01-01
Using a matrix-based system reliability (MSR) method, one can estimate the probabilities of complex system events by simple matrix calculations. Unlike existing system reliability methods whose complexity depends highly on that of the system event, the MSR method describes any general system event in a simple matrix form and therefore provides a more convenient way of handling the system event
An Empirically Based Method of Q-Matrix Validation for the DINA Model: Development and Applications
ERIC Educational Resources Information Center
de la Torre, Jimmy
2008-01-01
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…
Application of non-negative matrix factorization to multispectral FLIM data analysis.
Pande, Paritosh; Applegate, Brian E; Jo, Javier A
2012-09-01
Existing methods of interpreting fluorescence lifetime imaging microscopy (FLIM) images are based on comparing the intensity and lifetime values at each pixel with those of known fluorophores. This method becomes unwieldy and subjective in many practical applications where there are several fluorescing species contributing to the bulk fluorescence signal, and even more so in the case of multispectral FLIM. Non-negative matrix factorization (NMF) is a multivariate data analysis technique aimed at extracting non-negative signatures of pure components and their non-negative abundances from an additive mixture of those components. In this paper, we present the application of NMF to multispectral time-domain FLIM data to obtain a new set of FLIM features (relative abundance of constituent fluorophores). These features are more intuitive and easier to interpret than the standard fluorescence intensity and lifetime values. The proposed approach, unlike several FLIM data analysis methods, is not limited by the number of constituent fluorescing species or their possibly complex decay dynamics. Moreover, the new set of FLIM features can be obtained by processing raw multispectral FLIM intensity data, thereby rendering time deconvolution unnecessary and resulting in lesser computational time and relaxed SNR requirements. The performance of the NMF method was validated on simulated and experimental multispectral time-domain FLIM data. The NMF features were also compared against the standard intensity and lifetime features, in terms of their ability to discriminate between different types of atherosclerotic plaques. PMID:23024917
NASA Astrophysics Data System (ADS)
Baskar, S.; Suganthan, P. N.; Ngo, N. Q.; Alphones, A.; Zheng, R. T.
2006-04-01
The design of triangular fiber Bragg grating (TFBG) filters using covariance matrix adapted evolution strategy (CMAES) algorithm is presented. The TFBG filter can be used as a readout device in FBG-based sensor applications. Two different filter design problems are investigated. The first problem is the design of TFBG filter for a specified bandwidth. The other is maximizing the bandwidth of the TFBG filter for a given grating length and maximum index modulation of the FBG. A more practical asymmetrical triangular FBG filter design is also considered. The results show that for the same grating length and maximum index modulation, a larger bandwidth can be achieved with a chirped grating. The maximized bandwidth design can be used to achieve the maximum possible bandwidth for the specified grating length, maximum index modulation and chirp rate. The results obtained using CMAES algorithm (codes available at http://www.ntu.edu.sg/home/epnsugan) is compared with the results of PSO and other algorithms. Comparisons show that the CMAES algorithm is more consistent in obtaining the best solution with reduced computation time. Hence, the CMAES algorithm is effective for the design of TFBG filters for sensor applications.
Matrix Fatigue Cracking Mechanisms of Alpha(2) TMC for Hypersonic Applications
NASA Technical Reports Server (NTRS)
Gabb, Timothy P.; Gayda, John
1994-01-01
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.
Matrix fatigue cracking mechanisms of alpha(2) TMC for hypersonic applications
Gabb, T.P.; Gayda, J.
1994-02-01
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.
GIS applications for military operations in coastal zones
NASA Astrophysics Data System (ADS)
Fleming, S.; Jordan, T.; Madden, M.; Usery, E. L.; Welch, R.
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.
Mcdonough, William F.
Lithium isotope analysis of olivine by SIMS: Calibration of a matrix effect and application-spatial resolution analysis of light element isotope variations by secondary-ion mass spectrometry (SIMS) has of this calibration to a suite of olivines separated from basaltic lavas from Ko'olau, Hawai'i demonstrates
NASA Astrophysics Data System (ADS)
Lopez-Piñeiro, A.; Sanchez, M. L.; Moreno, B.
1992-06-01
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.
Operational transfer path analysis: Theory, guidelines and tire noise application
NASA Astrophysics Data System (ADS)
de Klerk, D.; Ossipov, A.
2010-10-01
The operational transfer path analysis (OTPA) method is the subject of research in this article, which starts with a discussion on it's theory. Here clear similarities with the MIMO technique in experimental modal analysis are found. Based on the knowledge of MIMO, one finds that input signals are allowed to be coherent to a certain extend. As coherence can be larger in OTPA in practice, the method is extended with the singular value decomposition method to reduce influences of noise. The article proceeds with a discussion on points of attention, or boundary conditions, in practical applications. An analysis on tire noise is included to illustrate the points of attention and the methods strength in, for example, vehicle TPA on tires.
NASA Astrophysics Data System (ADS)
Gamba, Irene M.; Zhang, Chenglong
2014-12-01
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.
An operational global ocean forecast system and its applications
NASA Astrophysics Data System (ADS)
Mehra, A.; Tolman, H. L.; Rivin, I.; Rajan, B.; Spindler, T.; Garraffo, Z. D.; Kim, H.
2012-12-01
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.
Applications of matrix derivatives to optimization problems in statistical pattern recognition
NASA Technical Reports Server (NTRS)
Morrell, J. S.
1975-01-01
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.
Turner, Andrew D; Powell, Andy L; Burrell, Stephen
2014-11-01
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
Algorithms and Application of Sparse Matrix Assembly and Equation Solvers for Aeroacoustics
NASA Technical Reports Server (NTRS)
Watson, W. R.; Nguyen, D. T.; Reddy, C. J.; Vatsa, V. N.; Tang, W. H.
2001-01-01
An algorithm for symmetric sparse equation solutions on an unstructured grid is described. Efficient, sequential sparse algorithms for degree-of-freedom reordering, supernodes, symbolic/numerical factorization, and forward backward solution phases are reviewed. Three sparse algorithms for the generation and assembly of symmetric systems of matrix equations are presented. The accuracy and numerical performance of the sequential version of the sparse algorithms are evaluated over the frequency range of interest in a three-dimensional aeroacoustics application. Results show that the solver solutions are accurate using a discretization of 12 points per wavelength. Results also show that the first assembly algorithm is impractical for high-frequency noise calculations. The second and third assembly algorithms have nearly equal performance at low values of source frequencies, but at higher values of source frequencies the third algorithm saves CPU time and RAM. The CPU time and the RAM required by the second and third assembly algorithms are two orders of magnitude smaller than that required by the sparse equation solver. A sequential version of these sparse algorithms can, therefore, be conveniently incorporated into a substructuring for domain decomposition formulation to achieve parallel computation, where different substructures are handles by different parallel processors.
Das, Madhuri; Goswami, Pranab
2013-02-01
Rapid detection of alcohol is important in clinical diagnosis and fermentation industry. An octameric alcohol oxidase (AOx) (Mr 675 kDa) from Pichia pastoris, immobilized on multiwalled carbon nanotubes-Nafion® (MWCNT-Nf) matrix and encapsulated with polyethylenimine (PEI) on gold electrode (AuE), showed a redox peak at 0.21V (vs. Ag/AgCl electrode at pH 7.5) for oxidation of alcohol. The electron transfer rate constant and surface coverage of the immobilized AOx were 1.69±0.15 s?¹ and 2.43×10?¹² mol cm?², respectively. Studies on response and kinetics of Au-MWCNT-Nf-AOx-PEI bioelectrodes for alcohol showed a linear response in the range of 8 ?M-42 ?M, response time of 55 s for steady state current, and detection limit of 5 ?M. The bioelectrode retains ~90% of the original response even after four weeks when stored in potassium phosphate buffer pH 7.5 at 4 °C. The fabricated bioelectrode was found to exclude interference caused by the common electroactive species such as ascorbic acid, uric acid, lactic acid, glucose and urea. The bioelectrode also showed reliable response characteristics in blood serum samples. The findings of the investigation have established the direct electrochemistry of the AOx protein and its potential biosensor application for quantitative detection of alcohol in blood serum. PMID:23000393
NASA Astrophysics Data System (ADS)
Bakuckas, J. G., Jr.; Johnson, W. S.
1992-07-01
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.
NASA Technical Reports Server (NTRS)
Bakuckas, J. G., Jr.; Johnson, W. S.
1992-01-01
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.
Nicolas Garron; Peter A Boyle; Renwick J Hudspith; Andrew T Lytle
2012-12-12
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.
Applications For Real Time NOMADS At NCEP To Disseminate NOAA's Operational Model Data Base
NASA Astrophysics Data System (ADS)
Alpert, J. C.; Wang, J.; Rutledge, G.
2007-05-01
A wide range of environmental information, in digital form, with metadata descriptions and supporting infrastructure is contained in the NOAA Operational Modeling Archive Distribution System (NOMADS) and its Real Time (RT) project prototype at the National Centers for Environmental Prediction (NCEP). NOMADS is now delivering on its goal of a seamless framework, from archival to real time data dissemination for NOAA's operational model data holdings. A process is under way to make NOMADS part of NCEP's operational production of products. A goal is to foster collaborations among the research and education communities, value added retailers, and public access for science and development. In the National Research Council's "Completing the Forecast", Recommendation 3.4 states: "NOMADS should be maintained and extended to include (a) long-term archives of the global and regional ensemble forecasting systems at their native resolution, and (b) re-forecast datasets to facilitate post-processing." As one of many participants of NOMADS, NCEP serves the operational model data base using data application protocol (Open-DAP) and other services for participants to serve their data sets and users to obtain them. Using the NCEP global ensemble data as an example, we show an Open-DAP (also known as DODS) client application that provides a request-and-fulfill mechanism for access to the complex ensemble matrix of holdings. As an example of the DAP service, we show a client application which accesses the Global or Regional Ensemble data set to produce user selected weather element event probabilities. The event probabilities are easily extended over model forecast time to show probability histograms defining the future trend of user selected events. This approach insures an efficient use of computer resources because users transmit only the data necessary for their tasks. Data sets are served by OPeN-DAP allowing commercial clients such as MATLAB or IDL as well as freeware clients such as GrADS to access the NCEP real time database. We will demonstrate how users can use NOMADS services to repackage area subsets and select levels and variables that are sent to a users selected ftp site. NOMADS can also display plots on demand for area subsets, selected levels, time series and selected variables.
Ioan Buciu; Ioannis Pitas
2004-01-01
In this paper two image representation approaches called non-negative matrix factorization (NMF) and local non-negative matrix factorization (LNMF) have been ap- plied to two facial databases for recognizing six basic fa- cial expressions. A principal component analysis (PCA) ap- proach was performed as well for facial expression recog- nition for comparison purposes. We found that, for the first database, LNMF
Structured Spatio-temporal Sample Covariance Matrix Enhancement with Application to Blind
Gesbert, David
the sample block circulant covariance matrix by enforcing two essential properties: rank and FIR structure-temporal channels over the past decade, based on the singularity of the received signal power spectral density matrix [3]. This singularity can be exploited to separate the white noise contribution. The main problem
ERIC Educational Resources Information Center
Hanson, J. Robert
Matrix organization focuses on the shift from cost center or process input planning to product output or results planning. Matrix organization puts the personnel and the resources where they are needed to get the job done. This management efficiency is brought about by dividing all organizational activities into two areas: (1) input or maintenance…
A Delphi–matrix approach to SEA and its application within the tourism sector in Taiwan
Nae-Wen Kuo; Teng-Yuan Hsiao; Yue-Hwa Yu
2005-01-01
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
47 CFR 1.62 - Operation pending action on renewal application.
Code of Federal Regulations, 2010 CFR
2010-10-01
... false Operation pending action on renewal application. 1.62 Section 1.62...1.62 Operation pending action on renewal application. (a)(1) Where there...license any proper and timely application for renewal of license with respect to any...
Sener, I.
1986-01-01
This paper introduces the concept of ''relative diffusion flux'', a new and practical approach to characterize the dissolution and diffusion regulated transfer of gas from the gas filled fracture space to the matrix oil in a dual porosity/permeability system. The proposed concept is analogous to the relative permeability concept in that the ''effective diffusion (or transfer) flux'' is determined as the product of the ''absolute (maximum) diffusion flux'' capacity of the matrix and the current level of ''relative diffusion flux''. It is shown that the latter can be expressed as a function of the current dissolved gas concentration in the matrix oil. This functional relationship between the ''relative diffusion flux'' and the dissolved gas concentration in the matrix oil is similar, in concept, to that between the relative permeability to a phase and its saturation level. It is also shown that, using the proposed method, representation of the gas transfer mechanism is reduced to a simple exchange-type relationship between the fractures and the matrix. This is achieved without having to determine an appropriate diffusion coefficient and the task of handling gas transfer by diffusion is significantly facilitated for fractured reservoir simulators. In the paper the concept of ''relative diffusion flux'' is developed, a method for obtaining the required data from a suitable laboratory experiment is provided, and the basic equations for the application of the new concept to fractured reservoir simulation are derived.
Operational forecast products and applications based on WRF/Chem
NASA Astrophysics Data System (ADS)
Hirtl, Marcus; Flandorfer, Claudia; Langer, Matthias; Mantovani, Simone; Olefs, Marc; Schellander-Gorgas, Theresa
2015-04-01
The responsibilities of the national weather service of Austria (ZAMG) include the support of the federal states and the public in questions connected to the protection of the environment in the frame of advisory and counseling services as well as expert opinions. The ZAMG conducts daily Air-Quality forecasts using the on-line coupled model WRF/Chem. The mother domain expands over Europe, North Africa and parts of Russia. The nested domain includes the alpine region and has a horizontal resolution of 4 km. Local emissions (Austria) are used in combination with European inventories (TNO and EMEP) for the simulations. The modeling system is presented and the results from the evaluation of the assimilation of pollutants using the 3D-VAR software GSI is shown. Currently observational data (PM10 and O3) from the Austrian Air-Quality network and from European stations (EEA) are assimilated into the model on an operational basis. In addition PM maps are produced using Aerosol Optical Thickness (AOT) observations from MODIS in combination with model data using machine learning techniques. The modeling system is operationally evaluated with different data sets. The emphasis of the application is on the forecast of pollutants which are compared to the hourly values (PM10, O3 and NO2) of the Austrian Air-Quality network. As the meteorological conditions are important for transport and chemical processes, some parameters like wind and precipitation are automatically evaluated (SAL diagrams, maps, …) with other models (e.g. ECMWF, AROME, …) and ground stations via web interface. The prediction of the AOT is also important for operators of solar power plants. In the past Numerical Weather Prediction (NWP) models were used to predict the AOT based on cloud forecasts at the ZAMG. These models do not consider the spatial and temporal variation of the aerosol distribution in the atmosphere with a consequent impact on the accuracy of forecasts especially during clear-sky days when the influence of the aerosols can have a strong impact on the AOT. WRF/Chem forecasts of the atmospheric optical properties are used to add information on the incoming radiation during these days. The evaluation of the model with satellite data for different episodes with clear-sky conditions is presented.
CAD application to power plant design, construction and operation
Pandya, J.M.; Marinkovich, P.S.; Mysore, R.K.
1982-05-01
The nuclear industry, beset with increasing costs of constructing new nuclear plants, needs new initiatives. One, recently developed, is the use of CAD-IGS techniques that are proven beneficial in reducing the construction costs. This methodology had been used successfully in aerospace and automotive industries for many years. Westinghouse CAD-IGS experience with an overseas nuclear plant, now under construction, demonstrates this to be an effective tool for design verification and project management with excellent capabilities for application to new designs and operating plant support. This is accomplished through the CAD plant model and associated data base, which results in reducing human error, more complete preengineering before the start of construction and effective space utilization. Furthermore, the data base accurately represents the as-built plant, which is essential for expediting future plant upgrades. Computer-based modeling is less expensive than the conventional scale modeling and the current technology developments viz. optical scanners, photogrammetry, IGES, and advanced minicomputers will favorably improve the cost-effectiveness.
14 CFR 119.36 - Additional certificate application requirements for commercial operators.
Code of Federal Regulations, 2010 CFR
2010-01-01
14 Aeronautics and Space 3 2010-01-01 2010-01-01...application requirements for commercial operators. 119.36 Section 119.36 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION...CERTIFICATION: AIR CARRIERS AND COMMERCIAL OPERATORS...
14 CFR 119.36 - Additional certificate application requirements for commercial operators.
Code of Federal Regulations, 2014 CFR
2014-01-01
14 Aeronautics and Space 3 2014-01-01 2014-01-01...application requirements for commercial operators. 119.36 Section 119.36 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION...CERTIFICATION: AIR CARRIERS AND COMMERCIAL OPERATORS...
14 CFR 119.36 - Additional certificate application requirements for commercial operators.
Code of Federal Regulations, 2011 CFR
2011-01-01
14 Aeronautics and Space 3 2011-01-01 2011-01-01...application requirements for commercial operators. 119.36 Section 119.36 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION...CERTIFICATION: AIR CARRIERS AND COMMERCIAL OPERATORS...
14 CFR 119.36 - Additional certificate application requirements for commercial operators.
Code of Federal Regulations, 2013 CFR
2013-01-01
14 Aeronautics and Space 3 2013-01-01 2013-01-01...application requirements for commercial operators. 119.36 Section 119.36 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION...CERTIFICATION: AIR CARRIERS AND COMMERCIAL OPERATORS...
14 CFR 119.36 - Additional certificate application requirements for commercial operators.
Code of Federal Regulations, 2012 CFR
2012-01-01
14 Aeronautics and Space 3 2012-01-01 2012-01-01...application requirements for commercial operators. 119.36 Section 119.36 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION...CERTIFICATION: AIR CARRIERS AND COMMERCIAL OPERATORS...
K. S. Shim; H. K. Nam; S. G. Song; Y. G. Kim; K. Y. Lee
2000-01-01
This paper presents briefly the application results of the eigen-sensitivity theory of an augmented matrix to small signal and transient stability problems of the large Korea Electric Power Co. (KEPCO) system. First, the real parts of the eigen-sensitivity of the inter-area mode for changes in line parameters are found to be negligibly small. It may be concluded from this result
E. J. Houser; D. B. Chrisey; M. Bercu; N. D. Scarisoreanu; A. Purice; D. Colceag; C. Constantinescu; A. Moldovan; M. Dinescu
2006-01-01
High-quality thin films of fragile chemoselective polymers with precise and accurate thickness, density and chemical integrity are required for advanced chemical sensor applications. While these attributes are difficult to achieve by conventional methods, we have successfully demonstrated the matrix-assisted pulsed laser evaporation (MAPLE) deposition of thin films of especially synthesized fluoro-alcohol substituted carbo-polysiloxane polymer coatings. The quadrupled output of a
27 CFR 71.49a - Applications for operating permits and industrial use permits.
Code of Federal Regulations, 2013 CFR
2013-04-01
...PRACTICES RULES OF PRACTICE IN PERMIT PROCEEDINGS Grounds for Citation § 71.49a Applications for operating permits and industrial...are not adequate to protect the revenue; He may issue a citation for the contemplated disapproval of the application....
27 CFR 71.49a - Applications for operating permits and industrial use permits.
Code of Federal Regulations, 2014 CFR
2014-04-01
...PRACTICES RULES OF PRACTICE IN PERMIT PROCEEDINGS Grounds for Citation § 71.49a Applications for operating permits and industrial...are not adequate to protect the revenue; He may issue a citation for the contemplated disapproval of the application....
27 CFR 71.49a - Applications for operating permits and industrial use permits.
Code of Federal Regulations, 2011 CFR
2011-04-01
...PRACTICES RULES OF PRACTICE IN PERMIT PROCEEDINGS Grounds for Citation § 71.49a Applications for operating permits and industrial...are not adequate to protect the revenue; He may issue a citation for the contemplated disapproval of the application....
27 CFR 71.49a - Applications for operating permits and industrial use permits.
Code of Federal Regulations, 2012 CFR
2012-04-01
...PRACTICES RULES OF PRACTICE IN PERMIT PROCEEDINGS Grounds for Citation § 71.49a Applications for operating permits and industrial...are not adequate to protect the revenue; He may issue a citation for the contemplated disapproval of the application....
27 CFR 71.49a - Applications for operating permits and industrial use permits.
Code of Federal Regulations, 2010 CFR
2010-04-01
...PRACTICES RULES OF PRACTICE IN PERMIT PROCEEDINGS Grounds for Citation § 71.49a Applications for operating permits and industrial...are not adequate to protect the revenue; He may issue a citation for the contemplated disapproval of the application....
NASA Astrophysics Data System (ADS)
Lai, Jing
The study presented in this thesis focuses on developing castable, precipitation-strengthened Al--B4C metal matrix composites (MMCs) for high temperature applications. In the first part, B4C plates were immersed in liquid aluminum alloyed with Sc, Zr and Ti to investigate the interfacial reactions between B4C and liquid aluminum The influences of Sc, Zr and Ti on the interfacial microstructure in terms of individual and combined additions were examined. Results reveal that all three elements reacted with B4C and formed interfacial layers that acted as a diffusion barrier to limit the decomposition of B4C in liquid aluminum. The interfacial reactions and the reaction products in each system were identified. With the combined addition of Sc, Zr and Ti, most of the Ti was found to enrich at the interface, which not only offered appropriate protection of the B4C but also reduced the consumption of Sc and Zr at the interface. In the second part, Sc and Zr were introduced into Al-15vol.% B 4C composites presaturated by Ti, and eight experimental composites with different Sc and Zr levels were prepared via a conventional casting technique. It was found that Sc was involved in the interfacial reactions with B 4C that partially consume Sc. The Sc addition yielded considerable precipitation strengthening in the as-cast and peak aged conditions. To achieve an equivalent strengthening effect of Sc in binary Al-Sc alloys, approximately double the amount of Sc is required in Al-B4C composites. On the contrary, no major Zr reaction products were found at the interfaces and the major part of Zr remained in the matrix for the precipitation strengthening. The combination of Sc and Zr enhanced sthe precipitation strengthening. Two kinds of nanoscale precipitates, Al3Sc and Al3(Sc, Zr), were found in the as-cast microstructure and contributed to the increase in the matrix hardness. In the third part, all the experimental composites were isothermally aged at 300, 350, 400 and 450°C after a homogenization/solution treatment. Results demonstrate that the addition of Sc generated a considerable precipitation hardening of the matrix of the composites for all aging temperatures applied. The precipitation hardening effect increased when increasing the Sc content and decreased with increase in aging temperature. The combination of alloying Sc and Zr in Al-B4C composites produced a remarkable synergistic effect. The addition of Zr provided not only a strength increase at peak aging but also an improvement of thermal stability. The composites with a high Zr:Sc ratio (?1) showed excellent thermal stability of the strength up to 400°C. The overaging in these materials was delayed by ˜100°C compared with the Zr-free composites at the same Sc level. The precipitate volume fraction, the average radius and the size distribution of nanoscale Al3Sc and Al3(Sc,Zr) precipitates during the aging process were measured. The Al3(Sc,Zr) precipitates generally showed a much better coarsening resistance than the Al3Sc precipitates. In the fourth part, two experimental composites with 0.4wt.% Sc and 0.4wt.% Sc plus 0.24wt.% Zr 0were selected to examine the mechanical properties during long-term exposure (2000h) at elevated temperatures from 250 to 350°C. For long-term thermal stability, the mechanical properties of the Sc and Zr containing composite were stable up to 300°C, while the composite containing only Sc exhibited a good softening resistance up to 250°C. At higher temperatures the strengths of both composites decreased with prolonged annealing time. The reduction of the composites' mechanical properties during long-time annealing at higher temperatures was dominated by the precipitate coarsening. Finally, two experimental composites with 0.58wt.% Sc and 0.58wt.% Sc plus 0.24wt.% Zr, were respectively hot-rolled to a 2 mm thick sheet with a total reduction of 93%. Results indicate that the Sc- and Zr-containing composites possessed a good hot rolling processability. (Abstract shortened by UMI.)
NASA Technical Reports Server (NTRS)
Welhart, E. K.
1976-01-01
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.
NASA Astrophysics Data System (ADS)
Heydari, M. H.; Hooshmandasl, M. R.; Maalek Ghaini, F. M.; Cattani, C.
2014-08-01
In this paper, a new computational method based on the generalized hat basis functions is proposed for solving stochastic Itô-Volterra integral equations. In this way, a new stochastic operational matrix for generalized hat functions on the finite interval [0,T] is obtained. By using these basis functions and their stochastic operational matrix, such problems can be transformed into linear lower triangular systems of algebraic equations which can be directly solved by forward substitution. Also, the rate of convergence of the proposed method is considered and it has been shown that it is O(1/n2). Further, in order to show the accuracy and reliability of the proposed method, the new approach is compared with the block pulse functions method by some examples. The obtained results reveal that the proposed method is more accurate and efficient in comparison with the block pule functions method.
R. J. Collighan; M. Griffin
2009-01-01
This review summarises the functions of the enzyme tissue transglutaminase (TG2) in the extracellular matrix (ECM) both as\\u000a a matrix stabiliser through its protein cross-linking activity and as an important cell adhesion protein involved in cell\\u000a survival. The contribution of extracellular TG2 to the pathology of important diseases such as cancer and fibrosis are discussed\\u000a with a view to the
Xiangrong Li; Dafa Li
2012-05-04
We solve the entanglement classification under stochastic local operations and classical communication (SLOCC) for general n-qubit states. For two arbitrary pure n-qubit states connected via local operations, we establish an equation between the two coefficient matrices associated with the states. The rank of the coefficient matrix is preserved under SLOCC and gives rise to a simple way of partitioning all the pure states of n qubits into different families of entanglement classes, as exemplified here. When applied to the symmetric states, this approach reveals that all the Dicke states |l,n> with l=1, ..., [n/2] are inequivalent under SLOCC.
NASA Astrophysics Data System (ADS)
Lin, Lin; Lu, Jianfeng; Car, Roberto; E, Weinan
2009-03-01
We propose a multipole representation of the Fermi-Dirac function and the Fermi operator and use this representation to develop algorithms for electronic structure analysis of metallic systems. The algorithm is quite simple and efficient. Its computational cost scales logarithmically with ??? where ? is the inverse temperature and ?? is the width of the spectrum of the discretized Hamiltonian matrix.
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...
Matrix factorization from non-linear projections: application in estimating T2 maps from few echoes.
Khurana, Prerna; Bhattacharjee, Protim; Majumdar, Angshul
2015-09-01
This work addresses the problem of estimating T2 maps from very few (two) echoes. Existing multi-parametric non-linear curve fitting techniques require a large number (16 or 32) of echoes to estimate T2 values. We show that our method yields very accurate and robust results from only two echoes, where as the curve-fitting techniques require about 16 echoes to achieve the same level of accuracy. We model T2 maps as a rank-deficient matrix. Since the relationship between T2 values and intensity values/K-space samples is not linear, estimating the T2 values requires recovering a low-rank matrix from non-linear projections. We solve this as a non-linear matrix factorization problem. Since the said problem has not been solved before, we propose a simple algorithm for the same. PMID:25959648
Pereverzev, Andrey; Sewell, Thomas D
2015-04-01
We show that for solids the effective Hessian matrix, averaged over the canonical ensemble, can be calculated from the force covariance matrix. This effective Hessian reduces to the standard Hessian as the temperature approaches zero, while at finite temperatures it implicitly includes anharmonic corrections. As a case study, we calculate the effective Hessians and the corresponding normal mode eigenvectors and frequencies for the crystalline organic explosives pentaerythritol tetranitrate and ?-1,3,5-trinitro-1,3,5-triazacyclohexane. The resulting normal mode frequencies are compared to those obtained by diagonalizing the standard Hessian matrix of second derivatives in Cartesian displacements about the potential energy minimum. Effects of temperature and statistical noise on the effective Hessians and normal mode frequencies are discussed. PMID:25854231
Operational applications of remote sensing in hydrology: success, prospects and problems
ALBERT RANGO; AHLAM I. SHALABY
1999-01-01
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,
JON A. TURNER; ROBERT A. KARASEK JR
1984-01-01
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
Agrawal, Manindra
Introduction Two Applications Basic Operations Tools Overview of the Tools A Survey of Techniques Used in Algebraic and Number Theoretic Algorithms Manindra Agarwal National University of Singapore and IIT Kanpur Kunming Tutorial, May 2005 #12;Introduction Two Applications Basic Operations Tools
EOS: a real-time operating system adapts to application architectures
Gianluigi Castelli; G. Ragazzini
1995-01-01
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
Theory and implementation of the MBPT density matrix. An application to one-electron properties
NASA Astrophysics Data System (ADS)
Trucks, Gary W.; Salter, E. A.; Sosa, Carlos; Bartlett, Rodney J.
1988-06-01
A perturbation-independent response density matrix has been derived and implemented for many-body perturbation theory. This density contains all orbital relaxation terms, which allows for fast, efficient computation of correlated one-electron response properties. As such, it eliminates the need for finite-field calculations of first-order properties. The method is applied to H 2O using an extended basis set for the MBPT (2), MBPT (3), and SDQ-MBPT (4) levels of theory. The relationship of the response density to an average density matrix is discussed.
R-matrix calculations for electron impact excitation and their application in astrophysical plasmas
NASA Astrophysics Data System (ADS)
Liang, G. Y.; Badnell, N. R.; Del Zanna, G.; Mason, H. E.; Storey, P. J.; Zhao, G.
2012-11-01
The large number of high-resolution spectra routinely recorded in the astrophysical and fusion communities leads to the need for an extensive set of accurate baseline atomic data. The advantages of the intermediate-coupling frame transformation (ICFT) R-matrix method make it feasible to provide excitation data along iso-electronic sequences (Z <= 36) at the high level of accuracy afforded by the R-matrix method. The resultant data helps to overcome the longstanding shortcomings in X-ray and EUV astronomy. This is one of the key goals of the UK Atomic Processes for Astrophysical Plasmas (APAP) network.
NASA Technical Reports Server (NTRS)
Hunter, William F.
1967-01-01
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.
Nonbacktracking operator for the Ising model and its applications in systems with multiple states.
Zhang, Pan
2015-04-01
The nonbacktracking operator for a graph is the adjacency matrix defined on directed edges of the graph. The operator was recently shown to perform optimally in spectral clustering in sparse synthetic graphs and have a deep connection to belief propagation algorithm. In this paper we consider nonbacktracking operator for Ising model on a general graph with a general coupling distribution and study the spectrum of this operator analytically. We show that spectral algorithms based on this operator is equivalent to belief propagation algorithm linearized at the paramagnetic fixed point and recovers replica-symmetry results on phase boundaries obtained by replica methods. This operator can be applied directly to systems with multiple states like Hopfield model. We show that spectrum of the operator can be used to determine number of patterns that stored successfully in the network, and the associated eigenvectors can be used to retrieve all the patterns simultaneously. We also give an example on how to control the Hopfield model, i.e., making network more sparse while keeping patterns stable, using the nonbacktracking operator and matrix perturbation theory. PMID:25974451
GIS applications for military operations in coastal zones
S. Fleming; T. Jordan; M. Madden; E. L. Usery; R. Welch
2009-01-01
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.
Transient response of perforated plate matrix heat exchangers
P. Ramesh; G. Venkatarathnam
1998-01-01
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
A mobile app for military operational entomology pesticide applications.
Britch, Seth C; Linthicum, Kenneth J; Aldridge, Robert L; Yans, Matthew W; Hill, David W; Obenauer, Peter J; Hoffman, Eric R
2014-09-01
Multiple field studies conducted for the Deployed War-Fighter Protection (DWFP) research program have generated more than 80 specific guidance points for innovative combinations of pesticide application equipment, pesticide formulations, and application techniques for aerosol and residual pesticide treatments in 6 ecological regions against a range of mosquito, sand fly, and filth fly nuisance and disease-vector threats. To synthesize and operationalize these DWFP field and laboratory efficacy data we developed an interactive iOS and Android mobile software application, the Pesticide App, consisting of specific pesticide application guidance organized by environment and target insect vector species. PMID:25843102
Operational analysis of timed Petri nets and application to the computation of performance bounds
G. Chiola; C. Anglano; J. Campos; J. M. Colom; M. Silva
1993-01-01
Operational analysis techniques are used to partially characterize the behavior of timed Petri nets under very weak assumptions on their timing semantics. New operational inequalities are derived that are typical of the presence of synchronization and that were therefore not considered in queuing network models. An interesting application of the operational laws to the statement and the efficient solution of
Operating system support for continuous media applications-RT-Mach extensions
Hideyuki Tokuda
1995-01-01
In this paper, we describe operating system support for continuous media applications based on our experience of using the Real-Time Mach microkernel. We first address the limitations of the current workstation operating systems. Then, we discuss operating system support for continuous media from three different points of view: architectural support, resource management support, and programming support. Several Real-Time Mach examples
Finding Nonoverlapping Substructures of a Sparse Matrix
Pinar, Ali; Vassilevska, Virginia
2005-08-11
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.
Jie Sun; Defeng Sun; Liqun Qi
2004-01-01
We study a smoothing Newton method for solving a nonsmooth matrix equation that includes semidenite programming and the semidenite complementarity problem as special cases. This method, if specialized for solving semidenite programs, needs to solve only one linear system per iteration and achieves quadratic convergence under strict complementarity and nondegeneracy. We also establish quadratic convergence of this method applied to
The Iterative Unitary Matrix Multiply Method and Its Application to Quantum Kicked Rotator
Tao Ma
2008-01-08
We use the iterative unitary matrix multiply method to calculate the long time behavior of the resonant quantum kicked rotator with a large denominator. The delocalization time is exponentially large. The quantum wave delocalizes through degenerate states. At last we construct a nonresonant quantum kicked rotator with delocalization.
NASA Technical Reports Server (NTRS)
Mishchenko, Michael I.; Travis, Larry D.; Mackowski, Daniel W.
2010-01-01
This note serves as a short introduction to the reprint of our article "T-matrix computations of light scattering by nonspherical particles: a review" (JQSRT 1996; 55:535:75). We first discuss the motivation for writing that article and explain its historical context. This is followed by a short overview of more recent developments.
Stefanos Zafeiriou; Anastasios Tefas; Ioan Buciu; Ioannis Pitas
2006-01-01
Abstract In this paper, two supervised methods for enhancing the classification accuracy of the Non- negative Matrix Factorization (NMF) algorithm are presented. The idea is to extend the NMF algorithm in order to extract features that enforce not only the spatial locality, but also the separability between,classes in a discriminant manner. The first method,em ploys discriminant analysis in the features
L. A. Dobrza?ski a; M. Kremzer; A. Nagel
Purpose: The purpose of this work is to investigate the influence of reinforcing phase's shape on structure and properties of composite materials with aluminium alloy matrix. Design\\/methodology\\/approach: The material for studies was produced by a method of pressure infiltration of the porous ceramic framework. In order to investigate the influence of reinforcing phase's shape the comparison was made between the
A 4 × 2 switch matrix in QFN24 package for 0.5–3 GHz application
NASA Astrophysics Data System (ADS)
Yuzhe, Liu; Pengfei, Mu; Renjie, Gong; Jing, Wan; Yulin, Zhang; Yuepeng, Yan
2014-12-01
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.
Application of Perception-Promotion Matrix Model—The Case of Kaohsiung City
Huei-Ju Chen; Po-Ju Chen; Ming-Hung Wang
2012-01-01
While a substantial amount of destination image research has been performed, few researchers have explored image perception gaps between tourists and government promotions. This study examines the perception gap between blogs and destination marketing organizations (DMOs) promotions by introducing a four-quadrant diagnostic tool: the Perception-Promotion Matrix (PPM). This case study collected data from 168 domestic and 64 international blogs, and
Evaluation of matrix type mucoadhesive tablets containing indomethacin for buccal application.
Ikeuchi-Takahashi, Yuri; Sasatsu, Masanaho; Onishi, Hiraku
2013-09-10
Nonsteroidal anti-inflammatory drugs (NSAIDs) are administered for pain relief from oral mucositis. However, the systemic administration of NSAIDs is limited due to systemic side effects. To avoid these side effects and treat local lesions effectively, a matrix type mucoadhesive tablet was developed. A mixture of hard fat, ethylcellulose (EC) and polyethylene glycol (PEG) was used as a matrix base, and indomethacin (IMC) was used as the principal agent. In tablets consisting of hard fat, EC and IMC, the drug release was sustained. In tablets consisting of hard fat, EC, considerable amounts of PEG and IMC, the drug release was relatively increased and IMC existed as the molecular phase or in an amorphous state. The in vitro adhesive force of the tablets consisting of hard fat, EC, considerable amounts of PEG and IMC was significantly increased as compared with the tablets consisting of hard fat and IMC. A significantly high tissue concentration and significantly low plasma concentration were observed after buccal administration of this matrix type mucoadhesive tablet as compared with that after oral administration of IMC. Thus, the matrix type mucoadhesive tablet has good potential as a preparation for the treatment of pain due to oral aphtha. PMID:23791737
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...
Saurabh Sinha
2006-01-01
Motivation and Results: The position weight matrix (PWM) is a pop- ular method to model transcription factor binding sites. A fundamental problem in cis-regulatory analysis is to ''count'' the occurrences of a PWM in a DNA sequence. We propose a novel probabilistic score to solve this problem of counting PWM occurrences. The proposed score has two important properties: (1) It
Applications of Fourier transform infrared spectroscopy to quality control of the epoxy matrix
NASA Technical Reports Server (NTRS)
Antoon, M. K.; Starkey, K. M.; Koenig, J. L.
1979-01-01
The object of the paper is to demonstrate the utility of Fourier transform infrared (FT-IR) difference spectra for investigating the composition of a neat epoxy resin, hardener, and catalysts. The composition and degree of cross-linking of the cured matrix is also considered.
A Delphi-matrix approach to SEA and its application within the tourism sector in Taiwan
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
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.
Preziosi, Luigi
Multiphase modeling of tumor growth and extracellular matrix interaction: Mathematical tools modeling framework tumors are described as a mixture of tumor and host cells within a porous structure of the growing tumor with the host tissue, their influence on tumor growth, and the attachment
NASA Astrophysics Data System (ADS)
Alpert, J. C.; Rutledge, G.; Wang, J.; Freeman, P.; Kang, C. Y.
2009-05-01
The NOAA Operational Modeling Archive Distribution System (NOMADS) is now delivering high availability services as part of NOAA's official real time data dissemination at its Web Operations Center (WOC). The WOC is a web service used by all organizational units in NOAA and acts as a data repository where public information can be posted to a secure and scalable content server. A goal is to foster collaborations among the research and education communities, value added retailers, and public access for science and development efforts aimed at advancing modeling and GEO-related tasks. The services used to access the operational model data output are the Open-source Project for a Network Data Access Protocol (OPeNDAP), implemented with the Grid Analysis and Display System (GrADS) Data Server (GDS), and applications for slicing, dicing and area sub-setting the large matrix of real time model data holdings. This approach insures an efficient use of computer resources because users transmit/receive only the data necessary for their tasks including metadata. Data sets served in this way with a high availability server offer vast possibilities for the creation of new products for value added retailers and the scientific community. New applications to access data and observations for verification of gridded model output, and progress toward integration with access to conventional and non-conventional observations will be discussed. We will demonstrate how users can use NOMADS services to repackage area subsets either using repackaging of GRIB2 files, or values selected by ensemble component, (forecast) time, vertical levels, global horizontal location, and by variable, virtually a 6- Dimensional analysis services across the internet.
NASA Astrophysics Data System (ADS)
Constantinescu, Catalin; Matei, Andreea; Ion, Valentin; Mitu, Bogdana; Ionita, Iulian; Dinescu, Maria; Luculescu, Catalin. R.; Vasiliu, Cristina; Emandi, Ana
2014-05-01
Thin films of ferrocene carboxaldehyde, also known as cyclopentadienyl(formylcyclopentadienyl)iron, were grown on silicon and glass substrates by matrix-assisted pulsed laser evaporation technique, using a Nd:YAG device operating at 266 nm (4?). Spectroscopic-ellipsometry, Fourier transform infrared spectroscopy, scanning electron microscopy and atomic force microscopy investigations revealed that the films are homogeneous in thickness, with dense morphology and without cracks, low surface roughness (?11 nm), and no significant chemical damage. Second harmonic generation capabilities of the thin films were evidenced by using a femtosecond Ti:sapphire laser.
Improve Boiler System Operations- Application of Statistical Process Control
Scarr, D.; Shea, D.
1989-01-01
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...
Improve Boiler System Operations- Application of Statistical Process Control
Scarr, D.; Shea, D.
of whom focused their efforts on the goal: Improve Boiler Systems Operations. 143 DENNY SHEA Sr. Engineering Specialist Monsanto Company Alvin, Texas IMPROVEMENT PROCESS Figure 1. STEPS TO STATISTICAL PROCESS CONTROL IMPLEMENTATION Two...
Design and implementation of a high performance matrix multiplier core for Xilinx Virtex FPGAs
S. Belkacemi; K. Benkrid; D. Crookes; A. Benkrid
2003-01-01
Matrix multiplication is a core operation in digital signal processing operations with a variety of applications such as image processing, computer graphics, sonar processing and robotics. This paper presents the design and implementation of a high performance, fully parallel matrix multiplication core. The core is parameterised and scalable in terms of the matrices' dimensions (row and column number) and the
Zirehpour, Alireza; Rahimpour, Ahmad; Jahanshahi, Mohsen; Peyravi, Majid
2014-01-01
Olive oil mill wastewater (OMW) is a concentrated effluent with a high organic load. It has high levels of organic chemical oxygen demand (COD) and phenolic compounds. This study presents a unique process to treat OMW. The process uses ultrafiltration (UF) membranes modified by a functionalized multi wall carbon nano-tube (F-MWCNT). The modified tube has an inner diameter of 15-30 nm and is added to the OMW treatment process to improve performance of the membrane. Tests were done to evaluate the following operating parameters of the UF system; pressure, pH and temperature; also evaluated parameters of permeate flux, flux decline, COD removal and total phenol rejection. The Taguchi robust design method was applied for an optimization evaluation of the experiments. Variance (ANOVA) analysis was used to determine the most significant parameters affecting permeate flux, flux decline, COD removal and total phenols rejection. Results demonstrated coagulation and pH as the most important factors affecting permeate flux of the UF. Moreover, pH and F-MWCNT UF had significant positive effects on flux decline, COD removal and total phenols rejection. Based on the optimum conditions determined by the Taguchi method, evaluations for permeate flux tests; flux decline, COD removal and total phenols rejection were about 21.2 (kg/m(2) h), 12.6%, 72.6% and 89.5%, respectively. These results were in good agreement with those predicted by the Taguchi method (i.e.; 22.8 (kg/m(2) h), 11.9%, 75.8 and 94.7%, respectively). Mechanical performance of the membrane and its application for high organic wastewater treatment were determined as strong. PMID:24291584
Metal Matrix Superconductor Composites for SMES-Driven, Ultra High Power BEP Applications: Part 1
NASA Astrophysics Data System (ADS)
Gross, Dan A.; Myrabo, Leik N.
2006-05-01
A superconducting magnetic energy storage (SMES) `battery' of order 0.25-1 km diameter is designed to demonstrate theoretical feasibility for large scale beamed energy propulsion (BEP) applications, charging at ˜300e MW from solar or nuclear sources, and discharging the full energy load into a gyrotron network in 1-2 minutes. The superconducting coil, whose storage capacity is 2.5 TJ, is made of structural carbon fiber filaments with a superconducting MgCNi3 high current density film surface layer, imbedded in a high electrical and thermal conductivity stabilizer metal, such as copper and/or beryllium. The SMES energy density is compared to other energy storage means and appears superior at the proposed operations scale and prolonged, frequent cycling duty. It is demonstrated that a toroidal coil with solenoidal winding configuration is most effective in specific energy (J/kg). Concurrently the high modulus and yield strength of the coil composite perform well for tensile hoop stress along the winding conductors, as well as transversely, to resist a self generated effective external pressure tending to buckling conditions in the thin walls. As such the toroid cross-section is re-enforced with periodic discrete rings. To achieve this hyper rigidity, the coil composite requires exclusion of traditional soft insulators (like epoxy), making use of a CVD (with tough metal-bonded Al2O3) continuous process of wire insulation and integration into a coil structural lattice, which ultimately needs to withstand very large quench voltages. The coil is built on a modular inflatable mandrel which is removed after assembly. A Part 2 associated paper treats the electromagnetic problem.
NASA Astrophysics Data System (ADS)
Lu, Ying Tsung; Chi, Sien
This study presents a compact optical configuration that can generate a multiplex dot-matrix hologram with complex interlaced images for anti-counterfeiting applications on valuable paper. Varying the orientation of the interference plane can enable the multiplex hologram to be recorded without changing the interference angle of two laser beams. With its simple asymmetric optical setup, a multiplex hologram with many interlaced images can be efficiently fabricated, increasing the cost of imitation. Experimental details of the asymmetric optical setup are also described.
Xiaofang Wang; Sotirios G. Ziavras
Recent advances in FPGA (Field-Programmable Gate Array) technologies have made feasible the implementation of low-cost parallel computing platforms for high- performance matrix computations. Compared to conventional multiprocessor systems, the resulting MultiProcessors-On-a-Programmable-Chip (MPoPCs) can provide unique advantages and opportunities in both software and hardware. It is shown in this paper that the performance of an MPoPC can be improved dramatically by
The OCLC Network: Its Architecture, Application, and Operation.
ERIC Educational Resources Information Center
Learn, Larry L.; Carpenter, George L.
1988-01-01
This overview of the OCLC telecommunications network discusses: its scope and applications, user demographics, the system architecture, access, costs, protocols, maintenance, vendor relationships, performance data, and network engineering. (13 references) (MES)
NASA Technical Reports Server (NTRS)
Caruso, J. J.; Trowbridge, D.; Chamis, C. C.
1989-01-01
The mechanics of materials approach (definition of E, G, Nu, and Alpha) and the finite element method are used to explore the effects of partial bonding and fiber fracture on the behavior of high temperature metal matrix composites. Composite ply properties are calculated for various degrees of disbonding to evaluate the sensitivity of these properties to the presence of fiber/matrix disbonding and fiber fracture. The mechanics of materials approach allows for the determination of the basic ply material properties needed for design/analysis of composites. The finite element method provides the necessary structural response (forces and displacements) for the mechanics of materials equations. Results show that disbonding of fractured fibers affect only E sub (111) and alpha sub (111) significantly.
Wick Haxton; Cecilia Lunardini
2008-01-01
Semi-leptonic electroweak interactions in nuclei - such as \\\\beta decay, \\\\mu\\u000acapture, charged- and neutral-current neutrino reactions, and electron\\u000ascattering - are described by a set of multipole operators carrying definite\\u000aparity and angular momentum, obtained by projection from the underlying nuclear\\u000acharge and three-current operators. If these nuclear operators are approximated\\u000aby their one-body forms and expanded in the
New representation of the multimode phase shifting operator and its application
NASA Astrophysics Data System (ADS)
Wang, Shuai; Jiang, Ji-Jian; Xu, Shi-Min; Li, Hong-Qi
2010-01-01
Based on the rotation transformation in phase space and the technique of integration within an ordered product of operators, the coherent state representation of the multimode phase shifting operator and one of its new applications in quantum mechanics are given. It is proved that the coherent state is a natural language for describing the phase shifting operator or multimode phase shifting operator. The multimode phase shifting operator is also a useful tool to solve the dynamic problems of the multimode coordinate-momentum coupled harmonic oscillators. The exact energy spectra and eigenstates of such multimode coupled harmonic oscillators can be easily obtained by using the multimode phase shifting operator.
S. K. Singhal; Renu Pasricha; Mamta Jangra; Rajiv Chahal; Satish Teotia; R. B. Mathur
Al-matrix composites reinforced with amino-functionalized multiwalled carbon nanotubes (fCNTs) have been fabricated using the powder metallurgy process. Using this method fCNTs (1.5wt.%) were dispersed in Al powder by high energy ball milling. Al–fCNTs composites (1.5wt.%) were fabricated by the consolidation of powders at 550MPa followed by sintering at 620°C under a vacuum of 10?2Torr for 2h. Functionalization of the nanotubes
Corina Popescu; Jose L. Martinez Lastra
2010-01-01
This paper presents an algorithm that selects a group of independent events out of a given set of possibly conflicting actions. The procedure is matrix-based and was implemented in JAVA to guide backtracking scheduling search based on a Petri Net-derived model of flow. The manufacturing systems particularly addressed in the implementation are using Web Services to implement the Service-Oriented-Architecture pattern.
Alexey Ozerov; Cédric Févotte
2009-01-01
We consider inference in a general data-driven object-based model of multichannel audio data, assumed generated as a possibly under- determined convolutive mixture of source signals. Each source is given a model inspired from nonnegative matrix factorization (NMF) with the Itakura-Saito divergence, which underlies a statistical model of superimposed Gaussian components. We address estimation of the mixing and source parameters using
Bouza, A.; Bathias, C. [Conservatoire National des Arts et Metiers, Paris (France); Masounave, J. [Ecole de Technologie Superieure, Montreal, Quebec (Canada)
1995-10-01
Metal Matrix Composites reinforced by particulates (MMCp) need to be characterized at the mesoscopic scale. It is interesting to know quickly the variation of volume fraction of particulates in three dimensional scale. Computed tomography can provide pictures in three dimensional scale of the volume fraction in the order of one minute. A general relationship is proposed in order to quantify the tomographic density. This relation is explained in terms X-rays absorption.
The All-Minors VCCS Matrix Tree Theorem, Half-Resistors and Applications in Symbolic Simulation
Seth Chailcen; Paliath Narendran
1995-01-01
The matrix tree theorem for directed graphs is generalized to cover all minors of nodal formulations of all linear circuits with voltage controlled current sources. The term signs are readily evaluated from linking-cycle-arborescence: configurations in a common generalization of Maxwell's and Coates' rules. All minors are treated with the same formalism. The formulation introduces half-resistors which are transposed unistors. Their
Asymptotic Stability of Delay-Difference Equations via Matrix Inequalities and Applications
VU N. PHAT; PHAN T. NAM
In this paper, by using a discrete version of the second Lyapunov method, we derive a suf- ficient condition independent of the delay for the asymptotic stability of delay-difference equations. The result is applied to obtain new stability conditions in terms of matrix inequalities for some classes of delay-difference equations such as high-order equations, perturbed equations, control systems and switched
An improved Newton iteration for the generalized inverse of a matrix, with applications
NASA Technical Reports Server (NTRS)
Pan, Victor; Schreiber, Robert
1990-01-01
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.
Cédric Févotte; Nancy Bertin; Jean-louis Durrieu
2009-01-01
This letter presents theoretical, algorithmic, and experimental results about nonnegative matrix factorization (NMF) with the Itakura-Saito (IS) divergence. We describe how IS-NMF is underlaid by a well-defined statistical model of superimposed gaussian components and is equivalent to maximum likelihood estimation of variance parameters. This setting can accommodate regularization constraints on the factors through Bayesian priors. In particular, inverse-gamma and gamma
Application of the transfer matrix for tuning the CSNS-DTL
NASA Astrophysics Data System (ADS)
Li, A.-Hong; Yin, Xue-Jun; Fu, Shi-Nian; Sun, Zhi-Rui
2011-10-01
In the construction of a drift tube LINAC (DTL), many factors caused during the fabrication and assembly of the structure cells cause the electric field distribution not as the same as the design curve. To solve this problem, the traditional way is to solve the equation of Slater's perturbation theorem to obtain the electrical field variation due to local frequency shift. However, that is very difficult under complicated conditions. Since the field perturbation equation is similar to the particle's transverse motion equation, which can be simply solved by using the transfer matrix method, we thus propose to apply a transfer matrix method in tuning the DTL. We demonstrate the availability and advantages of this method with 3D microwave code simulation and the LabVIEW calculation program. After two iterations, the initial error of the electric field of 19.5% has been improved greatly down to 1.3%-4.5%. This indicates that the transfer matrix method is very useful and convenient for the simplification of tuning procedures.
MIL-H-8501B: Application to shipboard terminal operations
NASA Technical Reports Server (NTRS)
Cappetta, A. N.; Johns, J. B.
1993-01-01
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.
L. J. Pekot; S. R. Reeves
2002-03-31
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.
NASA Astrophysics Data System (ADS)
Bonnes, Lars; Charrier, Daniel; Läuchli, Andreas M.
2014-09-01
We study a dissipative Bose-Hubbard chain subject to an engineered bath using a superoperator approach based on matrix product operators. The dissipation is engineered to stabilize a Bose-Einstein condensate wave function in its steady state. We then characterize the steady state emerging from the interplay between incompatible Hamiltonian and dissipative dynamics. While it is expected that interactions lead to this competition, even the kinetic energy in an open boundary condition setup competes with the dissipation, leading to a nontrivial steady state. We also present results for the transient dynamics and probe the relaxation time revealing the closing of the dissipative gap in the thermodynamic limit.
Application and Operation of Audiovisual Equipment in Education.
ERIC Educational Resources Information Center
Pula, Fred John
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…
Selected Mathematics Applications (Level A): Operating A Store.
ERIC Educational Resources Information Center
Hawaii State Dept. of Education, Honolulu. Office of Instructional Services.
Presented is one of a series of resource guides designed to provide students with an improved mathematics program. This guide emphasizes real-life situations focusing on the operation of a store. Classes are divided into grocery, meat, produce, drugs, and hardware sections at the beginning of the course. Students learn how to organize, collect,…
77 FR 58822 - Alliant Techsystems Operations LLC; Notice of Application
Federal Register 2010, 2011, 2012, 2013, 2014
2012-09-24
...to construct and operate new pipeline to transport natural gas from an interconnection with Columbia Gas of Maryland, Inc. (CMD) at the Maryland/West Virginia border to a regulating station on property owned by the U.S. Navy and leased by...
The application of NAVSTAR Differential GPS to civil helicopter operations
NASA Technical Reports Server (NTRS)
Beser, J.; Parkinson, B. W.
1981-01-01
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.
Program of KOTAC 2002 Operator Theory and Its Applications
Lee, Woo Young
: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
Program of KOTAC 2000 Operator Theory and Its Applications
Lee, Woo Young
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
The application of operational analysis to human motor behavior
Douglas G. Ellson
1949-01-01
A considerable amount of research has been performed recently on the form of motor responses as a function of those characteristics of the task which are determined by design of machines This paper calls attention to a method, operational analysis, which has been developed for the analysis of input-output relationships of electrical and mechanical transmission systems Essentially it assumes that
Lin, Lin; Car, Roberto; E, Weinan; 10.1103/PhysRevB.79.115133
2010-01-01
We propose a multipole representation of the Fermi-Dirac function and the Fermi operator, and use this representation to develop algorithms for electronic structure analysis of metallic systems. The new algorithm is quite simple and efficient. Its computational cost scales logarithmically with $\\beta\\Delta\\eps$ where $\\beta$ is the inverse temperature, and $\\Delta \\eps$ is the width of the spectrum of the discretized Hamiltonian matrix.
Options for organization and operation of space applications transfer centers
NASA Technical Reports Server (NTRS)
Robinson, A. C.; Madigan, J. A.
1976-01-01
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.
Risk and safety analysis for Florida commercial aerial application operations
NASA Astrophysics Data System (ADS)
Robbins, John Michael
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.
Pebble: A ComponentBased Operating System for Embedded Applications
Brustoloni, José Carlos
is intended to support complex embedded applications. This is accomplished through two key features: (1) safe typically requires that the system be written in a special, safe programming language, which may assumptions about the intrinsic per formance cost of hardware protection schemes need to be reexamined
Autonomous Robots in SWAT Applications: Research, Design, and Operations Challenges
Henry L Jones; Steve Morris
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
7 CFR 273.2 - Office operations and application processing.
Code of Federal Regulations, 2010 CFR
2010-01-01
...eligibility and § 273.8(i) concerning transfer of resources. The provision in § 273...273.12. (2 ) Within ten days of learning of the determination of the application...process provided that the person is an adult who is sufficiently aware of...
Application of diagnostics to determine operational readiness of aged motor-operated valves
Eissenberg
1987-01-01
Oak Ridge National Laboratory (ORNL) has been carrying out an aging assessment of motor-operated valves (MOVs) with the primary objective of recommending diagnostic methods for detecting and trending aging. As a result of experimental investigations at ORNL, it was discovered that the motor current during a valve stroke was a very useful diagnostic parameter for detecting and trending many MOV
Application of diagnostics to determine motor-operated valve operational readiness
Eissenberg
1986-01-01
ORNL has been carrying out an aging assessment of motor-operated valves (MOVs) with the primary objective of recommending diagnostic methods for detecting and trending aging. As a result of experimental investigations at ORNL, it was discovered that the motor current during a valve stroke was a very useful diagnostic parameter for detecting and trending many MOV drive train load variations.
Biologically motivated operator and its application to detecting intensity spots
NASA Astrophysics Data System (ADS)
Li, You; Lei, Zhihui
2008-03-01
We present a new operator, named the normalized negative Laplacian of Gaussian (NNLoG) operator to model the centre-surround mechanism of biological vision. We proved in mathematically that the NNLoG is invariant to scale. A computational scheme for selective detection of intensity spots is proposed. To detect intensity spots of specific size, the algorithm uses only one NNLoG of appropriate size. To detect intensity spots of unspecific size, the algorithm uses a set of NNLoG with equidistance sizes; the location and size of intensity spots can be determined simultaneously. This paper also investigated how to track target as a single spot, and to track rigid-body object with many spots on it. In the tracking, Kalman filter and particle filter are used as the probabilistic frameworks respectively. The robustness and effectiveness of the proposed method is demonstrated on both synthetic images and real sequences.
Gupta, Nikhil
Cost Metal Matrix Composites for Automotive and other Engineering Applications P. K. Rohatgi Materials and adequate properties for several automotive applications [1, 2]. Fly ash particles can be either solid will have to be remelted. Additions of fly ash can make automotive castings lighter, leading to further
Assessment of Erosion Resistance of Coated Polymer Matrix Composites for Propulsion Applications
NASA Technical Reports Server (NTRS)
Miyoshi, Kazuhisa; Sutter, James K.; Horan, Richard A.; Naik, Subhash K.; Cupp, Randall J.
2004-01-01
The erosion behavior of tungsten carbide-cobalt (WC-Co) coated and uncoated polymer matrix composites (PMCs) was examined with solid particle impingement using air jets. Erosion tests were conducted with Arizona road dust impinging at 20 degrees, 60 degrees, and 90 degrees angles at a velocity of 229 meters per second at both 294 and 366 K. Noncontact optical profilometry was used to measure the wear volume loss. Results indicate that the WC-Co coating enhanced erosion resistance and reduced erosion wear volume loss by a factor of nearly 2. This should contribute to longer wear lives, reduced related breakdowns, decreased maintenance costs, and increased product reliability.
An evaluation model of enterprise operation and its application
Zheng-long Peng; Hong-guang Sun; Jun Chen; Qi-jun Zhang
1999-01-01
This paper put forward an evaluation model with which one can make a comprehensive calculation of enterprise operation status\\u000a concerning profit ability, repaying capability, economic efficiency and developing potential; and meanwhile the method of\\u000a maximal distinction is employed to conduct the data synthesis of several targets and draw the conclusion of evaluation. Finally,\\u000a a pratical illustration is given in this
Integrated Timing Analysis of Application and Operating Systems Code
Roychoudhury, Abhik
,clementb,thuanpv,sudiptac,abhik}@comp.nus.edu.sg Abstract--Real-time embedded software often runs on a su- pervisory operating system software layer on top the maximum un-interrupted execution time of a program. In this work, we present a framework for RTOS aware is then composed in a controlled fashion to result in a RTOS-aware, micro-architecture-aware timing analysis
Application of Mimetic Operators to Tetrahedral Mesh MHD Codes
NASA Astrophysics Data System (ADS)
Marklin, George; Jarboe, Tom
2008-11-01
Mimetic operators are numerical approximations to the grad, div and curl operators that 'mimic' the orthogonality properties of their analytic counterparts, div(curl)=0 and curl(grad)=0. They define different components of vector fields at different parts of the mesh and can be viewed as a special type of finite element basis and can be defined to arbitrarily high order. They have been used in electromagnetic simulation codes for many years. This poster will show how they can be defined to lowest order on a tetrahedral mesh and applied to Taylor state computations and to the induction equation in an MHD simulation. They have the advantage of being able to exactly maintain zero divergence in both the magnetic field and current density and to make an exact separation of static and inductive electric fields. Mimetic Operators can also be used in the momentum equation and the results will be compared to other commonly used methods like the finite volume and discontinuous Galerkin methods. The new code will be used to run simulations of the HIT-SI experiment with insulated conductor boundary conditions and different injector configurations and results compared to the experiment and to simulations done with the NIMROD code.
Applications of triggered lightning to space vehicle operations
NASA Technical Reports Server (NTRS)
Jafferis, William; Sanicandro, Rocco; Rompalla, John; Wohlman, Richard
1992-01-01
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.
7 CFR 56.75 - Applicability of facility and operating requirements.
Code of Federal Regulations, 2014 CFR
2014-01-01
...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...
7 CFR 56.75 - Applicability of facility and operating requirements.
Code of Federal Regulations, 2013 CFR
2013-01-01
...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...
7 CFR 56.75 - Applicability of facility and operating requirements.
Code of Federal Regulations, 2012 CFR
2012-01-01
...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...
Federal Register 2010, 2011, 2012, 2013, 2014
2011-06-27
...Application for Exemption From the Natural Gas Vehicles for America AGENCY: Federal...adopted safety standards specific to natural gas vehicles that do not restrict the...buses equipped with roof-mounted natural gas tanks operating in interstate...
The BiotSavart operator for application to knot theory, fluid dynamics, and plasma physics
Cantarella, Jason
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
Saravanan, R.; Murugavel, V.
2010-01-01
LIFE CYCLE COST ANALYSIS OF WASTE HEAT OPERATED ABSORPTION COOLING SYSTEMS FOR BUILDING HVAC APPLICATIONS V. Murugavel and R. Saravanan Refrigeration and Air conditioning Laboratory Department of Mechanical Engineering, Anna University...
NASA Astrophysics Data System (ADS)
Jiang, Xin-Xiang; Nikanpour, Darius
2000-10-01
Application of advanced composite material for lightweight mirror for space optics needs to know the exact thermal expansion behavior of the composite in space thermal environment. In this paper, thermal expansion behaviors of plasma thermal sprayed and powder metallurgy processed ceramic particulate reinforced aluminum metal-matrix composites in simulated space thermal environment were studied. Thermal cycling was found to cause hysteresis and non-linear thermal expansion responses to the composites when the thermal stress within the composite exceeds the yield strength of the matrix, and subsequently causes matrix plastic flow. High matrix yield strength is necessary for MMC to have linear, stable and repeatable thermal expansion response in severe space thermal environment. The study lays out a fundamental for choosing existed or developing a new MMC for lightweight mirror application.
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
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
Removal and contraction operations to define combinatorial pyramids: application to the
Paris-Sud XI, Université de
Removal and contraction operations to define combinatorial pyramids: application to the design operations for several methods conceived in order to handle irregular image pyramids, for multi-level image maps framework. We propose a first experimentation of irregular pyramid as a basis for a discrete
Sorin Cristoloveanu; Daniela Munteanu; Michael S. T. Liu
2000-01-01
The pseudo-MOS transistor (?-MOSFET) is a surprising and useful technique for the rapid evaluation of SOI wafers, prior to any CMOS processing. We review the static and dynamic modes of operation as well as the main models and methods for electrical parameter extraction. Selected numerical simulations are presented in order to clarify the optimal conditions of operation. Finally, practical applications
Operational Analysis of Timed Petri Nets and Application to the Computation of Performance Bounds
Chiola, Giovanni
Operational Analysis of Timed Petri Nets and Application to the Computation of Performance Bounds G the behaviour of timed Petri nets unÂ der very weak assumptions on their timing semantics. New operational measures in timed Petri net models. The main conceptual differÂ ence between queueing and Petri net models
Jun Wang
This report presents the review of workforce planning applications of operations research and explores potential modelling of military training. We classify the operations research techniques applied in workforce planning into four major branches: Markov chain models, computer simulation models, optimisation models and supply chain management through System Dynamics. For each of these, we outline the underlying mathematical formalism and concepts,
Bank branch operating efficiency: A comparative application of DEA and the loglinear model
DI Giokas
1991-01-01
In this paper, a comparison regarding the operational efficiency of individual branches of a bank is made, through the application to the same body of data of two different estimation methods: (i) Data Envelopment Analysis (DEA) and (ii) Loglinear Model Analysis. In addition to that, the study examines whether operations in the bank branches were conducted in regions of increasing,
Paris-Sud XI, Université de
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
Application of Intelligent Aiding to Enable Single Operator Multiple UAV Supervisory Control
Scerri, Paul
, a toolset of intelligent aids for plan- ning, monitoring, workload relief and decision aiding becomeApplication of Intelligent Aiding to Enable Single Operator Multiple UAV Supervisory Control Bob-rated operator to provide supervisory control of multiple un- manned air vehicles (UAVs) engaged in tactical sup
A study of the economics, operations and applications of SONET self-healing ring architectures
Joseph Sosnosky; Tsong-Ho Wu; Dorothy L. Alt
1991-01-01
The economics, operations, and applications of synchronous optical network (SONET) unidirectional and bidirectional self-healing ring architectures are studied in order to ascertain whether the use of the two different types of ring architecture for SONET networks is advisable, both from an economic and operations viewpoint. It is shown that there are economic advantages to using both types of rings in
NASA Astrophysics Data System (ADS)
Shi, Zhou
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.
NASA Astrophysics Data System (ADS)
Michaels, J. F.
Automatic target detection and tracking features in radar sensors affect the testing and evaluation of radar performance, the assessment of equipment readiness for verification of sensor, command/control and engagement systems' operability, and operational training of radar operators and sensor management teams. Attention is presently given to Radar Environment Simulator Systems (RESSs), which facilitate the interjection of testing and training scenarios into the front end of radar receivers. RESSs are applicable to shipboard, air, and ground environments.
The Chimera II Real-Time Operating System for Advanced Sensor-Based Control Applications
David B. Stewart; Donald E. Schmitz; Pradeep K. Khosla
1997-01-01
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.
LOW DIMENSIONAL POLYTOPE APPROXIMATION AND ITS APPLICATIONS TO NONNEGATIVE MATRIX FACTORIZATION
and engineering. Its wide range of important applications such as text mining, chemoinformatics, factor retrieval under grants CCR-0204157 and DMS-0505880, and NIH Roadmap for Medical Research grant 1 P20 HG003900
NASA Astrophysics Data System (ADS)
Iannone, Michele; Esposito, Floriana; Cammarano, Aniello
2014-05-01
Blends obtained by mixing high temperature applications thermoplastics have been investigated. Namely the blends considered in this work are made by semi-crystalline thermoplastics PEEK with amorphous PEI. The final goal is to analyse the mechanical, chemical-physical and environmental resistance characteristics of these blends to evaluate their suitability as matrices of carbon reinforced composites for aeronautical structural applications. The first collected results are very promising.
NASA Astrophysics Data System (ADS)
Weiss, Brian A.; Fronczek, Lisa; Morse, Emile; Kootbally, Zeid; Schlenoff, Craig
2013-05-01
Transformative Apps (TransApps) is a Defense Advanced Research Projects Agency (DARPA) funded program whose goal is to develop a range of militarily-relevant software applications ("apps") to enhance the operational-effectiveness of military personnel on (and off) the battlefield. TransApps is also developing a military apps marketplace to facilitate rapid development and dissemination of applications to address user needs by connecting engaged communities of endusers with development groups. The National Institute of Standards and Technology's (NIST) role in the TransApps program is to design and implement evaluation procedures to assess the performance of: 1) the various software applications, 2) software-hardware interactions, and 3) the supporting online application marketplace. Specifically, NIST is responsible for evaluating 50+ tactically-relevant applications operating on numerous Android™-powered platforms. NIST efforts include functional regression testing and quantitative performance testing. This paper discusses the evaluation methodologies employed to assess the performance of three key program elements: 1) handheld-based applications and their integration with various hardware platforms, 2) client-based applications and 3) network technologies operating on both the handheld and client systems along with their integration into the application marketplace. Handheld-based applications are assessed using a combination of utility and usability-based checklists and quantitative performance tests. Client-based applications are assessed to replicate current overseas disconnected (i.e. no network connectivity between handhelds) operations and to assess connected operations envisioned for later use. Finally, networked applications are assessed on handhelds to establish baselines of performance for when connectivity will be common usage.
Si membrane based tactile sensor with active matrix circuitry for artificial skin applications
NASA Astrophysics Data System (ADS)
Park, Minhoon; Kim, Min-Seok; Park, Yon-Kyu; Ahn, Jong-Hyun
2015-01-01
The fabrication and the characteristics of an inorganic silicon-based flexible tactile sensor equipped with active-matrix circuitry compatible with a batch microfabrication process are reported. An 8 × 8 array of 260 nm-thick silicon strain gauges along with individual thin film transistor switches was built on a plastic substrate with 1 mm spacing, corresponding to a human spatial resolution at the fingertip. We demonstrated that the sensor shows excellent performances in terms of repeatability of 1.1%, hysteresis of 1.0%, scanning speed of as much as 100 kHz and resolution of 12.4 kPa while maintaining low power consumption and signal crosstalk through a series of experiments.
Wang, Degao; Tian, Fulin; Yang, Meng; Liu, Chenlin; Li, Yi-Fan
2009-05-01
Soil derived sources of polycyclic aromatic hydrocarbons (PAHs) in the region of Dalian, China were investigated using positive matrix factorization (PMF). Three factors were separated based on PMF for the statistical investigation of the datasets both in summer and winter. These factors were dominated by the pattern of single sources or groups of similar sources, showing seasonal and regional variations. The main sources of PAHs in Dalian soil in summer were the emissions from coal combustion average (46%), diesel engine (30%), and gasoline engine (24%). In winter, the main sources were the emissions from coal-fired boiler (72%), traffic average (20%), and gasoline engine (8%). These factors with strong seasonality indicated that coal combustion in winter and traffic exhaust in summer dominated the sources of PAHs in soil. These results suggested that PMF model was a proper approach to identify the sources of PAHs in soil. PMID:19201072
The Application of Range Space Operations to Color Images
Baldwin, C; Duchaineau, M
2002-03-26
The knowledge gained from scientific observation, experiment, and simulation is linked to the ability to analyze, understand, and manage the generated results. These abilities are increasingly at odds with the current, and future, capabilities to generate enormous quantities of raw scientific and engineering data from instruments, sensors, and computers. Many researchers are currently engaged in activities that seek to create new and novel methods for analyzing, understanding, and managing these vast collections of data. In this work, we present some of our research in addressing a particular type of problem in this broad undertaking. Much the scientific data of interest is in the form of observed, measured, or computed multivariate or multi-component vector field data--with either as physical or color data values. We are currently researching methods and techniques for working with this type of vector data through the use of a novel analysis technique. Our basic approach is to work with the vector field data in its natural physical or color space. When the data is viewed as a functional mapping of a domain, usually an index space, to a range, the physical or color values, potentially interesting characteristics of the data present themselves. These characteristics are useful in analyzing the vector fields based on quantities and qualities of the physical or color data values themselves. We will present the basic development of the idea of range space operations and detail the information we are interested in and some of the issues involved in its computation. The data we are first interested in, and discuss exclusively in this work, is color image data from scientific observations and simulations. Some of the operations on the range space representation that are of interest to this color image data are colormap construction, segmentation, color modeling, and compression. We will show some how some of the operations can be implemented in range space, what analysis capabilities they provide, and how they work on some example images. We will also discuss some of the future goals of the research along with what has been learned from this work.
NASA Technical Reports Server (NTRS)
Lippiatt, Thomas F.; Waterman, Donald
1985-01-01
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.
New genetic operators in the Fly algorithm: application to medical PET image reconstruction
Boyer, Edmond
through the human body using methods similar to those used in conventional X-ray computed tomography [7New genetic operators in the Fly algorithm: application to medical PET image reconstruction Franck Processing, EvoApplications 2010 6024 (2010)" #12;medicine, this method makes use of a gamma emitter as radio
Modelling Elasticity in Solids using Active Cubes -Application to Simulated Operations
et.al. [3] used a surface model reconstructed using the occluding contours in two x-rays to simulateModelling Elasticity in Solids using Active Cubes - Application to Simulated Operations Morten Bro on themetrictensor. The application of this approach to modelling the elastic deformation of human tissue in response
47 CFR 1.62 - Operation pending action on renewal application.
Code of Federal Regulations, 2014 CFR
2014-10-01
47 ? Telecommunication ? 1 ? 2014-10-01 ? 2014-10-01 ? false ? Operation pending action on renewal application. ? 1.62 ? Section 1.62 ? Telecommunication ? FEDERAL COMMUNICATIONS COMMISSION ? GENERAL ? PRACTICE AND PROCEDURE ? General Rules of Practice and Procedure ? General Application...
47 CFR 1.62 - Operation pending action on renewal application.
Code of Federal Regulations, 2013 CFR
2013-10-01
47 ? Telecommunication ? 1 ? 2013-10-01 ? 2013-10-01 ? false ? Operation pending action on renewal application. ? 1.62 ? Section 1.62 ? Telecommunication ? FEDERAL COMMUNICATIONS COMMISSION ? GENERAL ? PRACTICE AND PROCEDURE ? General Rules of Practice and Procedure ? General Application...
47 CFR 1.546 - Application to determine operating power by direct measurement of antenna power.
Code of Federal Regulations, 2010 CFR
2010-10-01
47 ? Telecommunication ? 1 ? 2010-10-01 ? 2010-10-01 ? false ? Application to determine operating power by direct measurement of antenna power. ? 1.546 ? Section 1.546 ? Telecommunication ? FEDERAL COMMUNICATIONS COMMISSION ? GENERAL ? PRACTICE AND PROCEDURE ? Broadcast Applications and...
Richard Fulford
2008-01-01
Enterprise resource planning (ERP) applications are the most ubiquitous of business information systems. They impact almost all business functions, bringing control and providing information. Some of these applications have already been operational for 20 years and this longevity has changed the way in which management of information systems is envisaged. Traditionally, information systems had a lifespan of perhaps five to
NASA Astrophysics Data System (ADS)
Gall, H. E.; Rao, P.; O'Connor, G.
2013-12-01
The land-application of biosolids and animal manure to agricultural fields has the potential to negatively impact the quality of nearby surface and subsurface water due to the presence of emerging contaminants in these residuals. We investigated the extent to which the vadose zone acts as a hydrologic and biogeochemical filter of two emerging contaminants, Triclosan (TCS) and estrone (E1) using a coupled source zone and vadose zone modeling approach. Monte Carlo simulations were run for a year following residual applications to explore the following research questions: (1) how does the application matrix (e.g., de-watered solids, liquid lagoon effluent, etc.) affect PPCP mass fluxes?; (2) how do hydro-climatic conditions and soil type affect PPCP mass fluxes?; (3) what role does the presence of macropore pathways play in PPCP export from the vadose zone; and (4) does the long-term, repeated application of residuals affect the ability of the vadose zone to act as an effective biogeochemical filter? The simulations were conducted for a sub-tropical climate with sand (e.g., Florida) and a humid climate with a silty clay loam (e.g., Midwestern United States). Simulation results suggest that the potential mobility of emerging contaminants increases linearly with increasing fraction applied to the mobile phase of the source zone (i.e., higher PPCP mass fraction in the dissolved phase during application). Following a single application, the total amount of PPCP mass exported from the source zone over the course of a year can be as high as 70% in a sub-tropical climate with sand soil. However, these types of soils do not have macropore flow pathways and the annual PPCP mass exported from the vadose zone is less than 1% of the mass applied. The higher organic carbon content in a silty clay loam reduces the amount of PPCP mass released from the source zone to less than 5% of the mass applied. In the presence of macropore pathways, the silty clay loam's vadose zone acts as a less effective biogeochemical filter than the sand's vadose zone. However, following a single application, Monte Carlo simulations suggest that the annual mass exported from the silty clay loam's vadose zone is less than 0.2% of the applied mass. Additionally, simulation results suggest that the mass exported from the vadose zone of the silty clay loam increases with time when fields receive long-term, repeated residual applications. Thus, field studies conducted with single applications likely underestimate mass fluxes exported from fields with a history of applications.
Mason, J.H.; Livingston, B.K.; Clarke, E.J.
1988-01-01
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.
NASA Astrophysics Data System (ADS)
Houser, E. J.; Chrisey, D. B.; Bercu, M.; Scarisoreanu, N. D.; Purice, A.; Colceag, D.; Constantinescu, C.; Moldovan, A.; Dinescu, M.
2006-04-01
High-quality thin films of fragile chemoselective polymers with precise and accurate thickness, density and chemical integrity are required for advanced chemical sensor applications. While these attributes are difficult to achieve by conventional methods, we have successfully demonstrated the matrix-assisted pulsed laser evaporation (MAPLE) deposition of thin films of especially synthesized fluoro-alcohol substituted carbo-polysiloxane polymer coatings. The quadrupled output of a Nd:YAG laser (265 nm) served as the laser source and depositions were done in a background pressure of N 2. Using various solvents appropriate to solvate this polymer (e.g. tetrahydrofuran, acetone and chloroform) and varying the laser fluence, we optimized the deposition of high-quality thin films on 1 cm 2 double-polished silicon substrates. The best solvent used as matrix was proved to be acetone. Under these conditions, the important functional groups were reproduced and observed by Fourier Transform Infrared Spectroscopy (FTIR) as compared to the drop cast films and the surface roughness was analysed using Atomic Force Microscopy (AFM) and found to be much smoother than conventional wet deposition techniques.
NASA Astrophysics Data System (ADS)
Wang, Li; Song, Xiangju; Wang, Tao; Wang, Shuzheng; Wang, Zhining; Gao, Congjie
2015-03-01
Polyethersulfone/carbon nanotubes (PES/CNTs) based mixed matrix membranes (MMMs) were prepared by phase inversion method for nanofiltration (NF) application. Carboxylated CNTs with different diameter and concentration were incorporated into the polymer matrix to enhance the performances of the NF membranes. The prepared PES/CNTs membranes were characterized and evaluated in terms of membranes morphology, structure, surface properties, and separation performances. Two types of CNTs with different diameters (20 and 40 nm, marked as CNT1 and CNT2, respectively) were chosen to investigate the effect of CNT diameter on membrane performances. The effect of CNT concentrations (from 0.01 to 1 wt%) was also tested by introduction of CNT2 in the MMMs. As a result, the MMMs embedded with CNT1 achieved better NF performances. When CNT2 concentration reaches 0.1 wt%, the PES/CNT2 membranes obtained the highest water flux (38.91 L/m2 h) and Na2SO4 rejection (87.25%) at 4 bar. The solute rejection was in a sequence of R(Na2SO4) > R(MgSO4) > R(NaCl).
Halder, P; Roy, P Deb; Das, H S
2014-01-01
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...
Accelerating the Execution of Matrix Languages on the Cell Broadband Engine Architecture
Khoury, Raymes; Scholz, Bernhard
2009-01-01
Matrix languages, including MATLAB and Octave, are established standards for applications in science and engineering. They provide interactive programming environments that are easy to use due to their script languages with matrix data types. Current implementations of matrix languages do not fully utilize high-performance, special-purpose chip architectures such as the IBM PowerXCell processor (Cell), which is currently used in the fastest computer in the world. We present a new framework that extends Octave to harvest the computational power of the Cell. With this framework the programmer is alleviated of the burden of introducing explicit notions of parallelism. Instead the programmer uses a new matrix data-type to execute matrix operations in parallel on the synergistic processing elements (SPEs) of the Cell. We employ lazy evaluation semantics for our new matrix data-type to obtain execution traces of matrix operations. Traces are converted to data dependence graphs; operations in the data dependence gra...
Shepelyansky, Dima
Google matrix 1 Google matrix A Google matrix is a particular stochastic matrix that is used by Google's PageRank algorithm. The matrix represents a graph with edges representing links between pages. The rank of each page can be generated iteratively from the Google matrix using the power method. However
Shepelyansky, Dima
Google matrix 1 Google matrix Fig.1. Google matrix of Wikipedia articles network, written [19]) A Google matrix is a particular stochastic matrix that is used by Google's PageRank algorithm be generated iteratively from the Google matrix using the power method. However, in order for the power method
Jordan, Michael I.
algorithms for posterior infer- ence and prediction, and illustrate the application of the models a nonparametric discriminative model and a nonparametric latent factor model. The interest is in considering to multivariate regression, multi-class classi#12;cation and multi-label prediction problems. Keywords: Dirichlet
Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry. Instrumentation and Applications
NASA Astrophysics Data System (ADS)
Muddiman, David C.; Bakhtiar, Ray; Hofstadler, Steven A.; Smith, Richard D.
1997-11-01
This article introduces educators and researchers to the theory, principles, instrumentation, and some applications of MALDI-MS. Reflectron time-of-flight (TOF) mass analyzers are described in detail, since TOF is the most common mass analyzer for ions produced by MALDI. Several excellent reviews give a more detailed account of MALDI-MS.
The Application of the K Matrix Theory to Molecular Photoionization Problems
NASA Astrophysics Data System (ADS)
Stephens, Jeffrey A.
The formal and numerical extension of the multiple -scattering model (MSM) to treat the photoionization of molecules at the many-electron level is described in detail. This is accomplished by combining the MSM with a previously developed many-electron theory of atomic photoionization, known as the K matrix theory. This theory expresses the exact, continuum final state of the atom or molecule as a superposition of states constructed from a complete set of one-electron orbitals. The present development thus utilizes the MSM technology which provides a complete set of one-electron molecular orbitals. A pilot calculation is presented for the 2(sigma)(,u) level of N(,2) in order to investigate: (a) from the practical standpoint, the computational advantages or disadvantages of such an approach to the molecular many-electron problem; (b) the elucidation of unexplained structure in the measured 2(sigma)(,u) photoionization cross section and angular distribution, by including in the theory electron correlation between the 2(sigma)(,u)(epsilon)(sigma)(,g) and the 3(sigma)(,g)(epsilon)(sigma)(,u) excitation channels, the latter of which contains the well-known shape resonance.
Design Considerations for Ceramic Matrix Composite Vanes for High Pressure Turbine Applications
NASA Technical Reports Server (NTRS)
Boyle, Robert J.; Parikh, Ankur H.; Nagpal, Vinod K.; Halbig, Michael C.
2013-01-01
Issues associated with replacing conventional metallic vanes with Ceramic Matrix Composite (CMC) vanes in the first stage of the High Pressure Turbine (HPT) are explored. CMC materials have higher temperature capability than conventional HPT vanes, and less vane cooling is required. The benefits of less vane coolant are less NOx production and improved vane efficiency. Comparisons between CMC and metal vanes are made at current rotor inlet temperatures and at an vane inlet pressure of 50 atm.. CMC materials have directionally dependent strength characteristics, and vane designs must accommodate these characteristics. The benefits of reduced NOx and improved cycle efficiency obtainable from using CMC vanes. are quantified Results are given for vane shapes made of a two dimensional CMC weave. Stress components due to thermal and pressure loads are shown for all configurations. The effects on stresses of: (1) a rib connecting vane pressure and suction surfaces; (2) variation in wall thickness; and (3) trailing edge region cooling options are discussed. The approach used to obtain vane temperature distributions is discussed. Film cooling and trailing edge ejection were required to avoid excessive vane material temperature gradients. Stresses due to temperature gradients are sometimes compressive in regions where pressure loads result in high tensile stresses.
The Application of the Haddon Matrix to Public Health Readiness and Response Planning
Barnett, Daniel J.; Balicer, Ran D.; Blodgett, David; Fews, Ayanna L.; Parker, Cindy L.; Links, Jonathan M.
2005-01-01
State and local health departments continue to face unprecedented challenges in preparing for, recognizing, and responding to threats to the public’s health. The attacks of 11 September 2001 and the ensuing anthrax mailings of 2001 highlighted the public health readiness and response hurdles posed by intentionally caused injury and illness. At the same time, recent natural disasters have highlighted the need for comparable public health readiness and response capabilities. Public health readiness and response activities can be conceptualized similarly for intentional attacks, natural disasters, and human-caused accidents. Consistent with this view, the federal government has adopted the all-hazards response model as its fundamental paradigm. Adoption of this paradigm provides powerful improvements in efficiency and efficacy, because it reduces the need to create a complex family of situation-specific preparedness and response activities. However, in practice, public health preparedness requires additional models and tools to provide a framework to better understand and prioritize emergency readiness and response needs, as well as to facilitate solutions; this is particularly true at the local health department level. Here, we propose to extend the use of the Haddon matrix—a conceptual model used for more than two decades in injury prevention and response strategies—for this purpose. PMID:15866764
2013-01-01
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
Jerry Chao; E. Sally Ward; Raimund J. Ober
The high quantum efficiency of the charge-coupled device (CCD) has rendered it the imaging technology of choice in diverse\\u000a applications. However, under extremely low light conditions where few photons are detected from the imaged object, the CCD\\u000a becomes unsuitable as its readout noise can easily overwhelm the weak signal. An intended solution to this problem is the\\u000a electron-multiplying charge-coupled device
The impact of LDEF results on the space application of metal matrix composites
NASA Technical Reports Server (NTRS)
Steckel, Gary L.; Le, Tuyen D.
1993-01-01
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.
NASA Technical Reports Server (NTRS)
Pak, Chan-gi; Li, Wesley W.
2009-01-01
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.
NASA Astrophysics Data System (ADS)
Schmidt, S.; Beyer, S.; Knabe, H.; Immich, H.; Meistring, R.; Gessler, A.
2004-08-01
Current rocket engines, due to their method of construction, the materials used and the extreme loads to which they are subjected, feature a limited number of load cycles. Various technology programmes in Europe are concerned, besides developing reliable and rugged, low cost, throwaway equipment, with preparing for future reusable propulsion technologies. One of the key roles for realizing reusable engine components is the use of modern and innovative materials. One of the key technologies which concern various engine manufacturers worldwide is the development of fibre-reinforced ceramics—ceramic matrix composites. The advantages for the developers are obvious—the low specific weight, the high specific strength over a large temperature range, and their great damage tolerance compared to monolithic ceramics make this material class extremely interesting as a construction material. Over the past years, the Astrium company (formerly DASA) has, together with various partners, worked intensively on developing components for hypersonic engines and liquid rocket propulsion systems. In the year 2000, various hot-firing tests with subscale (scale 1:5) and full-scale nozzle extensions were conducted. In this year, a further decisive milestone was achieved in the sector of small thrusters, and long-term tests served to demonstrate the extraordinary stability of the C/SiC material. Besides developing and testing radiation-cooled nozzle components and small-thruster combustion chambers, Astrium worked on the preliminary development of actively cooled structures for future reusable propulsion systems. In order to get one step nearer to this objective, the development of a new fibre composite was commenced within the framework of a regionally sponsored programme. The objective here is to create multidirectional (3D) textile structures combined with a cost-effective infiltration process. Besides material and process development, the project also encompasses the development of special metal/ceramic and ceramic/ceramic joining techniques as well as studying and verifying non destructive investigation processes for the purpose of testing components.
Lawrence R. Thorne
2011-10-18
I propose a novel approach to balancing equations that is applicable to all chemical-reaction equations; it is readily accessible to students via scientific calculators and basic computer spreadsheets that have a matrix-inversion application. The new approach utilizes the familiar matrix-inversion operation in an unfamiliar and innovative way; its purpose is not to identify undetermined coefficients as usual, but, instead, to compute a matrix null space (or matrix kernel). The null space then provides the coefficients that balance the equation. Indeed, the null space contains everything there is to know about balancing any chemical-reaction equation!
Scarola, Vito
compelling problems as well, e.g., electrons in graphene-based nanostructures9,10 , atomic gases under fast of wavefunctions that might serve as alternatives to par- ent Hamiltonians in validation. Matrix product rep- ment in terms of matrix products would also offer a useful tool to validate ansatz states since matrix
Matrix-dominated performance of thick-section fiber composites for flywheel applications
DeTeresa, S J; Allison, L M; Freeman, D C; Groves, S E
2001-01-17
An Achilles heel for the performance of thick-section, cylindrical fiber composite flywheels is the poor interlaminar properties of the material. Methods that have been used to minimize or eliminate radial tensile stresses include prestressing concentric cylinders and mass loading. There can also be significant interlaminar shear stresses at the edges of mass-loaded flywheels and in flywheels for high-power density applications where abrupt braking results in high torque levels. To specify adequate safety factors for thick-section flywheels used in these applications, the failure envelope and fatigue behavior under combined interlaminar stresses are required. Using a hollow cylindrical specimen, which was subjected to combined axial compression and torsion, results for fatigue and failure were generated for several flywheel material systems. Interlaminar compression resulted in significant enhancements to the interlaminar shear strength and results were compared to the predictions of proposed three-dimensional composite failure models. The interlaminar shear fatigue behavior of a carbodepoxy system was also studied and compression was found to greatly enhance fatigue life. The results demonstrate that radial compression stresses can yield improvements in the interlaminar shear strength and fatigue lifetimes of composite flywheel rotors.
Aleks Kleyn
2010-01-27
On the set of mappings of the given set, we define the product of mappings. If A is associative algebra, then we consider the set of matrices, whose elements are linear mappings of algebra A. In algebra of matrices of linear mappings we define the operation of product. The operation is based on the product of mappings. If the matrix a of linear mappings has an inverse matrix, then the quasideterminant of the matrix a and the inverse matrix are matrices of linear mappings. In the paper, I consider conditions when a matrix of linear mappings has inverse matrix, as well methods of solving a system of linear equations in an associative algebra.
Zhang, Qin; Dong, Chunling; Cui, Yan; Yang, Zhihui
2014-04-01
Graphical models for probabilistic reasoning are now in widespread use. Many approaches have been developed such as Bayesian network. A newly developed approach named as dynamic uncertain causality graph (DUCG) is initially presented in a previous paper, in which only the inference algorithm in terms of individual events and probabilities is addressed. In this paper, we first explain the statistic basis of DUCG. Then, we extend the algorithm to the form of matrices of events and probabilities. It is revealed that the representation of DUCG can be incomplete and the exact probabilistic inference may still be made. A real application of DUCG for fault diagnoses of a generator system of a nuclear power plant is demonstrated, which involves > 600 variables. Most inferences take < 1 s with a laptop computer. The causal logic between inference result and observations is graphically displayed to users so that they know not only the result, but also why the result obtained. PMID:24807944
Self-affine polytopes. Applications to functional equations and matrix theory
Voynov, Andrey S [M. V. Lomonosov Moscow State University, Faculty of Mechanics and Mathematics, Moscow (Russian Federation)
2011-10-31
A special kind of functional equation with compression of the argument--the affine self-similarity equation--is studied. The earlier known one-dimensional self-similarity equations are generalized to the multidimensional case of functions of several variables. A criterion for the existence and uniqueness of an L{sub p}-solution is established. Description of such equations involves classification of finite-dimensional convex self-affine compact sets. In this work properties of such objects are thoroughly analysed; in particular, a counterexample to the well-known conjecture about the structure of such bodies, which was put forward in 1991, is given. Applications of the results obtained include some facts about the convergence of products of stochastic matrices; also, criteria for the convergence of some subdivision algorithms are suggested. Bibliography: 39 titles.
Matrix diagonalization algorithm and its applicability to the nuclear shell model
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
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.
The Procedure Execution Manager and Its Application to Advanced Photon Source Accelerator Operation
NASA Astrophysics Data System (ADS)
Saunders, C. W.; Borland, M.
1997-05-01
The Procedure Execution Manager (PEM) combines a complete scripting environment for coding accelerator operation procedures with a manager application for executing and monitoring of the procedures. PEM is based on Tcl/Tk, a supporting graphics library, and the dp-tcl extension for distributed processing. A careful design balance has been achieved which meets the flexibility requirements of commissioning physicists and the operations-driven need for automation and a consistent user interface. The scripting environment provides support for distributed, parallel execution of procedures along with join and controlled abort operations. The manager application allows an operator to execute a procedure in automatic, semi-automatic, or manual modes. A number of successful applications of PEM to accelerator operations have been made to date. These include startup, shutdown, and other control of the positron accumulator ring (PAR), low-energy transport lines (LET), and the booster rf systems. The PAR/LET procedures make nested use of PEM's ability to run parallel procedures. There are also a number of procedures to guide and assist tune-up operations, to make accelerator physics measurements, and to diagnose equipment.
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 ...
Processing and properties of ceramic matrix-polymer composites for dental applications
NASA Astrophysics Data System (ADS)
Huang, Hsuan Yao
The basic composite structure of natural hard tissue was used to guide the design and processing of dental restorative materials. The design incorporates the methodology of using inorganic minerals as the main structural phase reinforced with a more ductile but tougher organic phase. Ceramic-polymer composites were prepared by slip casting a porous ceramic structure, heating and chemical treating the porous preform, infiltrating with monomer and then curing. The three factors that determined the mechanical properties of alumina-polymer composites were the type of polymer used, the method of silane treatments, and the type of bond between particles in the porous preforms. Without the use of silane coupling agents, the composites were measured to have a lower strength. The composite with a more "flexible" porous alumina network had a greater ability to plastically dissipate the energy of propagating cracks. However, the aggressive nature of the alumina particles on opposing enamel requires that these alumina-polymer composites have a wear compatible coating for practical application. A route to dense bioactive apatite wollastonite glass ceramics (AWGC)-polymer composites was developed. The problems associated with glass dissolution into the aqueous medium for slip casting were overcome with the use of silane. The role of heating rate and development of ceramic compact microstructure on composite properties was explored. In general, if isothermal heating was not applied, decreasing heating rate increased glass crystallinity and particle-particle fusion, but decreased pore volume. Also composite strength and fracture toughness decreased while modulus and hardness increased with decreasing heating rate. If isothermal heating was applied, glass crystallinity, pore content, and composite mechanical properties showed relatively little change regardless of the initial heating rate. The potential of AWGC-polymer composites for dental and implant applications was explored. Strengths and toughnesses were not severely degraded by immersion in simulated body fluids up to 30 days. The composite elastic modulus approached that of hard tissues and its wear behavior with opposing tooth was excellent. Growth of apatite over the entire composite surface was achieved in SBF. Growth of apatite in human whole saliva was achieved on the bioactive glass surface, but not on the composite surface.
Chao, Jerry; Ward, E. Sally; Ober, Raimund J.
2012-01-01
The high quantum efficiency of the charge-coupled device (CCD) has rendered it the imaging technology of choice in diverse applications. However, under extremely low light conditions where few photons are detected from the imaged object, the CCD becomes unsuitable as its readout noise can easily overwhelm the weak signal. An intended solution to this problem is the electron-multiplying charge-coupled device (EMCCD), which stochastically amplifies the acquired signal to drown out the readout noise. Here, we develop the theory for calculating the Fisher information content of the amplified signal, which is modeled as the output of a branching process. Specifically, Fisher information expressions are obtained for a general and a geometric model of amplification, as well as for two approximations of the amplified signal. All expressions pertain to the important scenario of a Poisson-distributed initial signal, which is characteristic of physical processes such as photon detection. To facilitate the investigation of different data models, a “noise coefficient” is introduced which allows the analysis and comparison of Fisher information via a scalar quantity. We apply our results to the problem of estimating the location of a point source from its image, as observed through an optical microscope and detected by an EMCCD. PMID:23049166
Tsakirakis, Angelos N; Kasiotis, Konstantinos M; Charistou, Agathi N; Arapaki, Niki; Tsatsakis, Aristidis; Tsakalof, Andreas; Machera, Kyriaki
2014-02-01
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
Model Driven Configuration of Secure Operating Systems for Mobile Applications in Healthcare
B. Agreiter; M. Alam; M. Hafner; J.-P. Seifert; X. Zhang
Trust and assurance of mobile platforms is a prime objec- tive when considering their deployment to security-critical scenarios in e.g., healthcare or e-government. Currently, several complementary ap- proaches are being pursued in parallel, ranging from purely hardware based, to operating system level, and application level solutions. To- gether, they build a \\
Fengqiang Gu; Xiaoyou Ye; Hongtang Gao; Heyan Wang; Jing Xie
2010-01-01
An operational amplifier-based micro eddy current sensor circuit is developed for improvement of sensitivity, reduction of power consumption and application in small mounting space. An eddy current sensor is designed on the optimized parameters in this circuit. Meanwhile, an eddy current sensor static calibration system is built by comparing to the measurement unit of Switzerland TESA Inductance Sensor TT80 of
Bio/Pharmaceutical Facilities, Operations and Validation Technician/Manager Open Applicant Pool
Stephens, Graeme L.
Bio/Pharmaceutical Facilities, Operations and Validation Technician/Manager Open Applicant Pool Bio a response team for equipment malfunction and maintenance. Supervise the procurement and use of all of Bio on all of BioMARC's equipment. Supports a controlled database for the documentation and trending
Battery-Operated Electronic Ballast of Fluorescent Lamps for Photovoltaic Applications
Ying-Chun Chuang; Yu-Lung Ke; Hung-Shiang Chuang
2007-01-01
A novel battery-operated electronic ballast of fluorescent lamps for photovoltaic applications is presented in this paper. In order to reserve the electrical power transformed from photovoltaic modules, a battery charger with high performance, low switching losses, low cost and high efficiency should be designed. This paper presents a novel battery charger with electronic ballast which is characterized with simple structure,
An investigation of potential applications of OP-SAPS: Operational Sampled Analog Processors
NASA Technical Reports Server (NTRS)
Parrish, E. A.; Mcvey, E. S.
1977-01-01
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.
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...
Science and Operational Applications Research (SOAR) Project RADARSAT-2 DATA USE AND BENEFITS Ice Cover Mapping With RADARSAT-2 SAR Data SOAR ID number: 2153 Name: George Leshkevich (co-PI, Son V and Benefits The objective of this project is to use RADARSAT-2 data to continue the development of advanced
Operating System Support for Augmented Reality Applications Loris D'Antoni1
Kohno, Tadayoshi
-level libraries like OpenCV or the Mi- crosoft Kinect SDK. In this paper, we explore how operating systems should.g., for gestures), aided by user-space libraries such as the Kinect SDK or OpenCV. Today, these applications can
Reconfiguration Methods for On-orbit Servicing, Assembly, and Operations with Application to
Reconfiguration Methods for On-orbit Servicing, Assembly, and Operations with Application to Space by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Jaime Peraire Chairman, Committee on Graduate Students #12;2 #12;Reconfiguration Methods for On for the degree of Masters of Science in Aeronautics and Astronautics Abstract Reconfiguration is an important
MODAL TESTING AND ANALYSIS OF STRUCTURES UNDER OPERATIONAL CONDITIONS: INDUSTRIAL APPLICATIONS
L. Hermans; H. VAN DER AUWERAER
1999-01-01
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
C.-Y. Chou; C.-H. Chen; C.-C. Yang; C.-C. Wu
2005-01-01
Parameter design, introduced by Taguchi, has been shown to be an effective approach for improving quality and productivity at low cost. The present article reports a case study of the application of parameter design to the determination of the optimal operating conditions of an integrated numerical control (NC) lathe such that the roundness and surface roughness of the cylindrical workpieces,
Matrix Algorithms by Dr. Amin Witno
A and the right- hand matrix B side by side. 2. Apply Gauss-Jordan algorithm to convert this matrix to its reduced] consisting of the matrix A and the identity matrix É side by side. 2. Apply Gauss-Jordan algorithm to convertMatrix Algorithms by Dr. Amin Witno There are only three elementary row operations: 1. Interchange
NASA Technical Reports Server (NTRS)
Benbenek, Daniel B.; Walsh, William
2010-01-01
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.
General Purpose Data-Driven Online System Health Monitoring with Applications to Space Operations
NASA Technical Reports Server (NTRS)
Iverson, David L.; Spirkovska, Lilly; Schwabacher, Mark
2010-01-01
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.
Lee, Jiann-Fong; Chen, Hsuen-Li; Lee, Geneh-Siang; Tseng, Shao-Chin; Lin, Mei-Hsiang; Liau, Wen-Bin
2012-01-01
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
Comment on "Photoionization of endohedral atoms using R-matrix methods: Application to Xe@C60"
NASA Astrophysics Data System (ADS)
Amusia, M. Ya.; Chernysheva, L. V.
2014-05-01
We demonstrate that what is called a total photoionization cross section in the work by T. W. Gorczyca, M. F. Hasoglu, and S. T. Manson [Phys. Rev. A 86, 033204 (2012), 10.1103/PhysRevA.86.033204] is in fact a partial photoionization cross section. These quantities differ impressively even in isolated atoms. This demonstrates the prominent role of inelastic collisions of a photoelectron from an intermediate or inner shell not mentioned in their paper. We discuss briefly the correspondence between the experimental data, theoretical predictions, and R-matrix results from Phys. Rev. A 86, 033204 (2012), 10.1103/PhysRevA.86.033204. We call attention to the danger in using parameters of C60 potential selected by fitting the same experimental data that one wants to describe. We show that our criticism is applicable to the theoretical part of the most recent publication on photoionization of Xe @C60+ [10 R. A. Phaneuf et al., Phys. Rev. A 88, 053402 (2013), 10.1103/PhysRevA.88.053402].
Code of Federal Regulations, 2012 CFR
2012-07-01
...CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE RHODE ISLAND § 939.780 Surface mining permit applications...applicant for a permit shall demonstrate compliance with Rhode Island air quality control laws (R.I. General Laws...
Code of Federal Regulations, 2014 CFR
2014-07-01
...CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE RHODE ISLAND § 939.780 Surface mining permit applications...applicant for a permit shall demonstrate compliance with Rhode Island air quality control laws (R.I. General Laws...
Code of Federal Regulations, 2013 CFR
2013-07-01
...CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE RHODE ISLAND § 939.780 Surface mining permit applications...applicant for a permit shall demonstrate compliance with Rhode Island air quality control laws (R.I. General Laws...
Code of Federal Regulations, 2011 CFR
2011-07-01
...CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE RHODE ISLAND § 939.780 Surface mining permit applications...applicant for a permit shall demonstrate compliance with Rhode Island air quality control laws (R.I. General Laws...
NASA Astrophysics Data System (ADS)
Koshida, N.; Kojima, A.; Ikegami, N.; Suda, R.; Yagi, M.; Shirakashi, J.; Yoshida, T.; Miyaguchi, H.; Muroyama, M.; Nishino, H.; Yoshida, S.; Sugata, M.; Totsu, K.; Esashi, M.
2015-03-01
Making the best use of the characteristic features in nanocrystalline Si (nc-Si) ballistic hot electron source, the alternative lithographic technology is presented based on the two approaches: physical excitation in vacuum and chemical reduction in solutions. The nc-Si cold cathode is a kind of metal-insulator-semiconductor (MIS) diode, composed of a thin metal film, an nc-Si layer, an n+-Si substrate, and an ohmic back contact. Under a biased condition, energetic electrons are uniformly and directionally emitted through the thin surface electrodes. In vacuum, this emitter is available for active-matrix drive massive parallel lithography. Arrayed 100×100 emitters (each size: 10×10 ?m2, pitch: 100 ?m) are fabricated on silicon substrate by conventional planar process, and then every emitter is bonded with integrated complementary metal-oxide-semiconductor (CMOS) driver using through-silicon-via (TSV) interconnect technology. Electron multi-beams emitted from selected devices are focused by a micro-electro-mechanical system (MEMS) condenser lens array and introduced into an accelerating system with a demagnification factor of 100. The electron accelerating voltage is 5 kV. The designed size of each beam landing on the target is 10×10 nm2 in square. Here we discuss the fabrication process of the emitter array with TSV holes, implementation of integrated ctive-matrix driver circuit, the bonding of these components, the construction of electron optics, and the overall operation in the exposure system including the correction of possible aberrations. The experimental results of this mask-less parallel pattern transfer are shown in terms of simple 1:1 projection and parallel lithography under an active-matrix drive scheme. Another application is the use of this emitter as an active electrode supplying highly reducing electrons into solutions. A very small amount of metal-salt solutions is dripped onto the nc-Si emitter surface, and the emitter is driven without using any counter electrodes. After the emitter operation, thin metal (Cu, Ni, Co, and so on) and elemental semiconductors (Si and Ge) films are uniformly deposited on the emitting surface. Spectroscopic surface and compositional analyses indicate that there are no significant contaminations in deposited thin films. The implication is that ballistic hot electrons injected into solutions with appropriate kinetic energies induce preferential reduction of positive ions in solutions with no by-products followed by atom migration, nuclei formation, and the subsequent thin film growth. The availability of this technique for depositing thin SiGe films is also demonstrated by using a mixture solution. When patterned fine emission windows are formed on the emitter surface, metal and semiconductor wires array are directly deposited in parallel.
OPERATING TEMPERATURE WINDOW FOR SIC CERAMICS AND COMPOSITESFOR FUSION ENERGY APPLICATIONS
Katoh, Yutai [ORNL; Snead, Lance Lewis [ORNL
2009-01-01
Limitations in operating conditions, primarily the steady-state operating temperature, of silicon carbide-based ceramics and composites for applications to structural and functional components in fusion blanket systems were critically examined based on the latest experimental results. Irradiation-induced high temperature swelling and irradiation creep were identified to be the likely factors limiting the upper temperature bound for structural applications, whereas irradiation-induced thermal conductivity degradation was identified to be the primary factor to limit the lower temperature bound when substantial heat flux is anticipated. For the application to flow channel inserts in liquid metal blankets, insulating properties will likely limit the upper temperature bound, whereas the lower temperature bound may be limited by swelling-induced secondary stress. Additionally, key scientific issues which need to be addressed for the better definition of design limitations were identified.
Yang, Junfeng
Web Application Security Standards and Practices Page 1 of 13 Web Application Security Standard Operating Environment (SOE) V1.2 Columbia University Web Application Security Standards and Practices Objective and Scope Effective Date: January 2011 This Web Application Security Standards and Practices
Grishok, Alla
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
Ana S. Duarte; Anabela O. Pereira; Antonio M. S. Cabrita; Arthur J. G. Moir; Euclides M. V. Pires; Marlene M. T. Barros
2005-01-01
Type I collagen is the major fibrous protein of mammals being needed to strengthen and organise the extracellular matrix (ECM). Connective tissue components are modulated by matrix metalloproteinases, which are critical for disintegration and remodelling of ECM under physiological and pathological conditions. Cardosin A is an abundant aspartic proteinase (AP) from Cynara cardunculus L. that has been shown to be
Kevin Nishikata; Maiko Ariga; Norihiro Iwai; Yoshihiko Ikenaga; Casimirus Setiagung; Takeo Kageyama; Hitoshi Shimizu; Noriyuki Yokouchi; Akihiko Kasukawa; Fumio Koyama
2005-01-01
Furukawa Electric is looking at a variety of applications using VCSEL. New applications such as sensors, automobile, and home electric appliances require new characteristics of stable CW operation, higher modulation, wider temperature range, and higher density array. Automobile Local Area Network called MOST (Media Orientated System Transport) is now popular using 650 nm LED plus Plastic Optical Fiber with a
Sharma, Sandeep
2015-01-14
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
Seventh Annual Workshop on Space Operations Applications and Research (SOAR 1993), volume 2
NASA Technical Reports Server (NTRS)
Krishen, Kumar (editor)
1994-01-01
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.
Using reactor operating experience to improve the design of a new Broad Application Test Reactor
Fletcher, C.D.; Ryskamp, J.M.; Drexler, R.L.; Leyse, C.F.
1993-07-01
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.
Not Available
1980-07-01
This seminar material was developed primarily to provide solar photovoltaic (PV) applied engineering technology to the Federal community. An introduction to photoconductivity, semiconductors, and solar photovoltaic cells is included along with a demonstration of specific applications and application identification. The seminar details general systems design and incorporates most known information from industry, academia, and Government concerning small solar cell power system design engineering, presented in a practical and applied manner. Solar PV power system applications involve classical direct electrical energy conversion and electric power system analysis and synthesis. Presentations and examples involve a variety of disciplines including structural analysis, electric power and load analysis, reliability, sizing and optimization; and, installation, operation and maintenance. Four specific system designs are demonstrated: water pumping, domestic uses, navigational and aircraft aids, and telecommunications. All of the applications discussed are for small power requirement (under 2 kilowatts), stand-alone systems to be used in remote locations. Also presented are practical lessons gained from currently installed and operating systems, problems at sites and their resolution, a logical progression through each major phase of system acquisition, as well as thorough design reviews for each application.
Kurokawa, Norifumi; Ueda, Koichi; Tsuji, Motomu; Kuroyanagi, Yoshimitsu
2008-01-01
The growth and development of maxillary bone and dentition is often impaired in patients who have undergone the cleft palate operation (push back method). Wound contraction exerts adverse effects on maxillary bone growth. The present study investigates the ability of cultured dermal substitute (CDS) to ameliorate maxillary bone growth suppression in experimental animals. We prepared CDS by incorporating rat fibroblasts into a matrix comprising a spongy hyaluronic acid (HA) sheet combined with collagen gel. The number of fibroblasts in the CDS was adjusted to 1.0 x 10(5) cells/cm(2). Wistar rats were randomly assigned to one of the following groups: I, control (no operation); II, surgically exposed bone without matrix or CDS; III, surgery with matrix; IV, surgery with CDS. Under pentobarbital anesthesia, about 2 x 4 mm of the mucosa and periosteum was surgically removed from the left half of the palate. A silicone sheet was placed on the matrix or CDS and affixed with superglue. The palatal width was measured 9 weeks later in skull preparations as the distance between the cheek side cusps of the second molar. The palates in group IV were significantly wider than those in groups II and III, and did not significantly differ from that in the control group. These findings indicated that CDS has the ability to promote wound healing and reduce scar formation through the synergic effects of fibroblasts and the matrix, and thereby to ameliorate indirectly the growth of maxillary bone. PMID:19184287
The application of time-motion study principles to retail flower store operations
Tolle, Leon J., Jr
1952-01-01
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... PROGRESS INQ INDUSTRY SINCE I 923 & WHEN THE SOC I ETY OF ANIERI CAN FLOR I STS PUBLISHED A REPORT OF THE STATUS OF THE INDUSTRY (Q) & MORE. AND MORE FLORISTS HAVE COVE TO REALIZE THEIR COMi&ION INTERESTS THI S UNIFYING SPIRIT GRADUALLY PROGRESSED...
Nishimura, Asako; Hayakawa, Taro; Yamamoto, Yu; Hamori, Mami; Tabata, Keiko; Seto, Keiko; Shibata, Nobuhito
2012-01-23
The concept of this research is, using the acetyl-(Arg-Ala-Asp-Ala)?-CONH? peptide hydrosol (PuraMatrix™, PM), to develop an new injectable formula of controlled insulin delivery for subcutaneous injection. PM has sol-gel phase transition behavior, and was developed as a scaffold in the field of tissue engineering. The aqueous media of the PM including insulin changed from a sol to a gel phase with increasing ion strength of phosphate ion and pH in working environments in vitro and in vivo. In this study, we examined the in vitro insulin dissolution behavior and the in vivo pharmacokinetics and pharmacodynamics after subcutaneous administration of PM-insulin sol (PM-Isol). In the in vitro release study, after PM-Isol was converted to a gel phase (PM-Igel), PM concentration-dependent and controlled release of insulin were observed at the final concentrations of PM between 0.1% and 2.0% (w/v). The PM-Isol is changed to gel form in vivo, and exhibited a sustained-release pharmacokinetics of insulin, where PM concentration-dependent prolongation of efficacy was found. The plasma glucose level markedly decreased, and the lowest plasma glucose level was maintained up to 24h when 2.0% (w/v) PM-Isol was administered subcutaneously to rats. The PM-Isol, we developed here, is applicable for the wild-type of insulin, and increased the bioavailability and hypoglycemic efficacy of insulin after subcutaneous injection. Hence, the PM is a useful inactive ingredient to produce various types of control-released system of insulin by making just a few changes in PM content of the formulation. PMID:22064453
Pietrogrande, Maria Chiara; Bacco, Dimitri; Marchetti, Nicola; Mercuriali, Mattia; Zanghirati, Gaetano
2011-01-30
This paper describes a signal processing method for comprehensive analysis of the large data set generated by hyphenated GC-MS technique. It is based on the study of the 2D autocovariance function (2D-EACVF) computed on the raw GC-MS data matrix, extending the procedure previously developed for 1D to 2D signals. It appears specifically promising for GC-MS investigation, in particular to single out ordered patterns in complex data: such patterns can be simply identified by visual inspection from deterministic peaks in the 2D-EACVF plot. A case of order along the retention time axis (x=t(R)) is represented by a horizontal sequence of peaks, located at the same interdistance ?t(R)=b(x), e.g., b(x) is the CH(2) retention time increment between subsequent terms of an homologous series. The order along the fragment mass axis (y=m/z) contains information on analyte fragmentation patterns. Deterministic peaks appear in the 2D-EACVF plot at ?m/z values corresponding to the most abundant ion fragments - dominating fragments in MS spectrum - or to ions generated by repetitive loss of the same ion fragment, i.e., ?m/z=14 amu produced by the [CH(2)]() group loss in n-alkanes. Method applicability was tested by processing GC-MS data of organic extracts of atmospheric aerosol samples: attention is focused on identifying and characterizing homologous series of organics, i.e., n-alkanes and n-alkanoic acids, since they are considered molecular tracers able to track the origin and fate of different organics in the environment. PMID:21215857
NASA Astrophysics Data System (ADS)
Sun, Yuanshan
1990-01-01
A matrix method of solution for a set of coupled Boltzmann equations and its applications to the thermal transport across boundaries in superfluid ^3 He and the femtosecond relaxation of laser-excited electrons in GaAs are presented in this dissertation. In the first part, the temperature and normal fluid velocity of superfluid ^3He between parallel plates have been calculated in the presense of a stationary heat flow normal to the plates. The system is modelled by Landau-Boltzmann equation and a diffuse scattering mechanism at the boundaries. In the hydrodynamic regime the temperature jump at the wall turns out to be small, but it replaced by a large amplitude exponential regime of macroscopic characteristic length. The three Onsager coefficients proposed recently by Grabinski and Liu are determined. In the Knudsen regime the thermal boundary resistance is found to increase exponentially with decreasing temperature. The case of ^4He is briefly discussed. In the second part, the transient distribution functions of laser-excited electrons in the Gamma and L valleys are presented by solving a set of coupled rate equations resulting from the coarse graining of the Boltzmann equation. The distribution functions obtained from this new method agree extremely well with those obtained from the more computationally intensive Monte Carlo approach. On a longer time scale, oscillations occur in the distribution functions and agree with those obtained from hot luminescence spectrum. The separation in energy between the peaks of the electron distribution in the conduction band clearly shows the role of polar optic phonon scattering in the relaxation processes. Our results also show that a shoulder-like feature in the luminescence spectrum above 0.3eV is not due to the emission of an 8meV TA phonon as originally suggested.
Wiles, Kerry R; Washington, M K
2014-12-01
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
Gautam Sen; Sumit Mishra; Usha Jha; Sagar Pal
2010-01-01
This paper details the study of applicability of microwave initiated synthesized polyacrylamide grafted guar gum (GG-g-PAM) as matrix for controlled release of 5-amino salicylic acid (a drug used for the treatment of ulcerative colitis). In vitro release of this drug from various grades of GG-g-PAM has been studied by USP dissolution method (paddle type). The effect of percentage grafting on
NASA Technical Reports Server (NTRS)
Perkins, Sharon; Martin, Andrea; Bavinger, Bill
1990-01-01
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.
Christopher Davis; Thomas Warner; Elford Astling; James Bowers
1999-01-01
We report on the results from an operational forecast system built to predict local circulations forced by complex terrain and other variations in land-surface characteristics. The cornerstone of the prediction system is the Penn State University\\/National Center for Atmospheric Research (PSU\\/NCAR) mesoscale model, version 5 (MM5), a nonhydrostatic regional model. The specific application reported herein is for the region surrounding
NASA Astrophysics Data System (ADS)
Kubala, M.
1992-12-01
The applicability of modified first-order theories to the vibration of a thin cylindrical composite shell is examined. It is shown that, by introducing inertial forces, it is possible to obtain an equation of the shell governing natural vibrations. This approach yields the equations of motion specific to each individual deformation theory and makes it possible to derive, in a simple manner, the structural operator which meets all the special demands of various shell configurations.
NASA Technical Reports Server (NTRS)
Clancey, William J.
2004-01-01
This viewgraph presentation provides an overview of past and possible future applications for artifical intelligence (AI) in astronaut instruction and training. AI systems have been used in training simulation for the Hubble Space Telescope repair, the International Space Station, and operations simulation for the Mars Exploration Rovers. In the future, robots such as may work as partners with astronauts on missions such as planetary exploration and extravehicular activities.
Application and Operation of a 2-MW Organic Rankine Cycle System on a Refinery FCC Unit
Drake, R. L.
of the nterna tional VDI Seminar, Zurich, September 10-12, 1984. 2. Langebrake, C. O. "Refrigerant-1l4 Ranki e Cycle Energy Recovery Technology from the Gaseous Diffusion Industry." Goodyear Atomic Corporation Report No. GAT-916, Piketon, Ohio, September...APPLICATION AND OPERATION OF A 2-MW ORGANIC RANKINE CYCLE SYSTEM ON A REFINERY FCC UNIT Richard L Drake Mechanical Technology Incorporated Latham, New York ABSTRACT The nation's largest organic Rankine cycle (ORC) waste heat recovery system...
Container Shipping: Operating System Support for I\\/O-Intensive Applications
Joseph Pasquale; Eric W. Anderson; Keith Muller
1994-01-01
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
Joint Polar Satellite System's Operational and Research Applications from Suomi NPP
NASA Astrophysics Data System (ADS)
Goldberg, M.
2014-12-01
The Joint Polar Satellite System is NOAA's new operational satellite program and includes the Suomi National Polar-orbiting Partnership (S-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 operational and research applications, and includes: 1) 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. 2) 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. 3) Climate monitoring - data from JPSS instruments, including OMPS and CERES 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. To bridge the gap between products and applications, the JPSS Program has established a proving ground program to optimize the use of JPSS data with other data sources to improve key products and services. A number of operational and research applications will be discussed, including the use of CrIS and ATMS for improved weather forecasting, the use of VIIRS for environmental monitoring of sea ice, smoke, fire, floods, droughts, coastal water quality (e.g. harmful algal blooms), and OMPS for monitoring ozone and aerosol and sulfur dioxide. Demonstrations of the new day night band on VIIRS for enhanced nighttime environmental monitoring will be presented.
I. Borde; I. Yaron; M. Jelinek
1977-01-01
Low thermal-potential energy sources, e.g., waste heat, solar energy, etc., can be utilized for refrigeration or cooling in various industrial applications. Suitable working solutions have been selected to operate in an absorption refrigeration cycle. A computer program delineated the ranges of feasible operating parameters and chose the optimal operating conditions for given energy sources, refrigeration requirements and ambient conditions. The
Christian Engstrom; Markus Richter
2008-07-01
We study wave propagation in periodic and frequency dependent materials. The approach in this paper leads to spectral analysis of a quadratic operator pencil where the spectral parameter relates to the quasimomentum and the frequency is a parameter. We show that the underlying operator has a discrete spectrum, where the eigenvalues are symmetrically placed with respect to the real and imaginary axis. Moreover, we discretize the operator pencil with finite elements and use a Krylov space method to compute eigenvalues of the resulting large sparse matrix pencil.
Sen, Gautam; Pal, Sagar
2009-07-01
This paper reports the investigation of microwave initiated synthesized polyacrylamide grafted carboxymethylstarch (CMS-g-PAM) as matrix for sustained drug release. 'In vitro' release of a model drug (5-amino salicylic acid) from CMS-g-PAM matrix has been studied. It is evident that higher the percentage grafting, more sustained is the rate of drug release. Further, the percentage grafting vs. t(50) value (i.e. time taken for release of 50% of the enclosed drug) correlation has been successfully studied for the first time. This correlation will lead to the possibility of a programmable drug release matrix based on grafted polysaccharide. In this matrix, the rate of release of the enclosed drug can be precisely programmed simply by adjustment of percentage grafting during synthesis. PMID:19447259
Constanza Rojas-Molina
2011-10-31
We study the Anderson metal-insulator transition for non ergodic random Schr\\"odinger operators in both annealed and quenched regimes, based on a dynamical approach of localization, improving known results for ergodic operators into this more general setting. In the procedure, we reformulate the Bootstrap Multiscale Analysis of Germinet and Klein to fit the non ergodic setting. We obtain uniform Wegner Estimates needed to perform this adapted Multiscale Analysis in the case of Delone-Anderson type potentials, that is, Anderson potentials modeling aperiodic solids, where the impurities lie on a Delone set rather than a lattice, yielding a break of ergodicity. As an application we study the Landau operator with a Delone-Anderson potential and show the existence of a mobility edge between regions of dynamical localization and dynamical delocalization.
Some implications of the application or removal of agency seals by facility operators
Walford, F. (UKAEA Atomic Energy Research Establishment, Harwell (UK)); Drayer, D.D.; Sonnier, C.S. (Sandia National Labs., Albuquerque, NM (USA))
1990-04-01
This report is the outcome of a study of the technical and procedural requirements which would need to be met if the Agency and facility operators were to agree that under certain circumstances the operator could remove or apply on Agency seal in the absence of an inspector. In the FRG and USA Support Programmes respectively an electronic seal (VACOSS) and a CCTV system (MIVS) have been developed. Through a joint project, an interface has been demonstrated which enables the seal data to be superimposed upon the surveillance data. This interface is briefly described in the appendix. A proposed application for this integrated system is to allow facility operators to carry-out some of the seal procedures normally performed by an inspector, thereby reducing the need for inspector presence at certain crucial times.
Rishel, Jeremy P.; Glantz, Clifford S.
2008-09-30
A new atmospheric dispersion modeling system is being tested for consequence assessment applications in emergency response operations. DUSTRAN is an operational, fully documented atmospheric dispersion modeling system designed originally to allow U.S. Department of Defense personnel to rapidly predict and assess the potential air quality impacts of military maneuvers at military training and testing ranges. This model also can be applied at emergency operations centers where it can fill the niche between on-site, plume-based modeling systems and the National Atmospheric Release Advisory Center off-site, particle-based modeling system. DUSTRAN offers a user-friendly graphical user interface based on the Environmental Systems Research Institute ArcMap geographic information system software that allows DUSTRAN to be easily customized to operate at any location in the world. DUSTRAN employs the U.S. Environmental Protection Agency regulatory CALPUFF modeling system to create a three-dimensional wind field and simulate downwind plume transport and diffusion. Other dispersion models also can be integrated into the DUSTRAN componentized architecture, allowing the user to choose the appropriate dispersion modeling engine for a given application. The DUSTRAN architecture also supports the development and integration of a variety of source-term models.
Operator agency in process intervention: tampering versus application of tacit knowledge
NASA Astrophysics Data System (ADS)
Van Gestel, P.; Pons, D. J.; Pulakanam, V.
2015-04-01
Statistical process control (SPC) theory takes a negative view of adjustment of process settings, which is termed tampering. In contrast, quality and lean programmes actively encourage operators to acts of intervention and personal agency in the improvement of production outcomes. This creates a conflict that requires operator judgement: How does one differentiate between unnecessary tampering and needful intervention? Also, difficult is that operators apply tacit knowledge to such judgements. There is a need to determine where in a given production process the operators are applying tacit knowledge, and whether this is hindering or aiding quality outcomes. The work involved the conjoint application of systems engineering, statistics, and knowledge management principles, in the context of a case study. Systems engineering was used to create a functional model of a real plant. Actual plant data were analysed with the statistical methods of ANOVA, feature selection, and link analysis. This identified the variables to which the output quality was most sensitive. These key variables were mapped back to the functional model. Fieldwork was then directed to those areas to prospect for operator judgement activities. A natural conversational approach was used to determine where and how operators were applying judgement. This contrasts to the interrogative approach of conventional knowledge management. Data are presented for a case study of a meat rendering plant. The results identify specific areas where operators' tacit knowledge and mental model contribute to quality outcomes and untangles the motivations behind their agency. Also evident is how novice and expert operators apply their knowledge differently. Novices were focussed on meeting throughput objectives, and their incomplete understanding of the plant characteristics led them to inadvertently sacrifice quality in the pursuit of productivity in certain situations. Operators' responses to the plant are affected by their individual mental models of the plant, which differ between operators and have variable validity. Their behaviour is also affected by differing interpretations of how their personal agency should be applied to the achievement of production objectives. The methodology developed here is an integration of systems engineering, statistical analysis, and knowledge management. It shows how to determine where in a given production process the operator intervention is occurring, how it affects quality outcomes, and what tacit knowledge operators are using. It thereby assists the continuous quality improvement processes in a different way to SPC. A second contribution is the provision of a novel methodology for knowledge management, one that circumvents the usual codification barriers to knowledge management.
D. Benredjem; A. Sureau
1997-01-01
In order to evaluate the influence of a plasma on the polarization state of radiation, we have solved the general radiative-transfer problem, the solution of which is not a scalar quantity but the Stokes vector, formed of four components. We have used a matrix formalism and, accordingly, the plasma properties (absorption, stimulated emission, etc) are represented by a 0953-4075\\/30\\/24\\/003\\/img1 matrix,
Gautam Sen; Sagar Pal
2009-01-01
This paper reports the investigation of microwave initiated synthesized polyacrylamide grafted carboxymethylstarch (CMS-g-PAM) as matrix for sustained drug release. ‘In vitro’ release of a model drug (5-amino salicylic acid) from CMS-g-PAM matrix has been studied. It is evident that higher the percentage grafting, more sustained is the rate of drug release. Further, the percentage grafting vs. t50 value (i.e. time
Meng, Fan; Yang, Xiaomei; Zhou, Chenghu
2014-01-01
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
Masakiyo Miyazawa; Hiroyuki Takada
2002-01-01
We consider a fluid queue with downward jumps, where\\u000athe fluid flow rate and the downward jumps are controlled by a\\u000abackground Markov chain with a finite state space. We show that\\u000athe stationary distribution of a buffer content has a matrix\\u000aexponential form, and identify the exponent matrix. We derive\\u000athese results using time-reversed arguments and the background\\u000astate
Town, G.G.; Stratton, R.C.
1985-01-01
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.
Stratton, R.C.; Town, G.G.
1985-01-01
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 artifical 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.
Advanced imaging tools and their applications for nuclear power plant operation and maintenance
Owen, D.E. (ENCORE Technical Resources, Inc., Middletown, PA (United States))
1992-05-01
US nuclear power plants were surveyed to evaluate their use of advanced imaging tools for operations and maintenance tasks. The purpose was to determine the extent to which these tools are used, to identify their current range of applications, and to quantify their benefits. The report examines power plant uses of videodisc-based image storage and retrieval systems, still video systems, photogrammetry techniques, multimedia, and image transmission technologies. Virtual reality -- a future technology not presently used by the industry -- is also briefly examined. General descriptions of these advanced imaging tools and how they are used are given. Specific nuclear plant applications are discussed and both quantitative and anecdotal descriptions of their benefits are presented. Conclusions, comments, and observations are made on how these tools are currently used and on new applications being developed. New directions for the technologies and possible scenarios for future nuclear plant use are proffered.
Fan Hongyi [Department of Material Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026 (China); Department of Physics, Shanghai Jiao Tong University, Shanghai 200030 (China)], E-mail: fhym@sjtu.edu.cn
2008-02-15
We show that the technique of integration within normal ordering of operators [Hong-yi Fan, Hai-liang Lu, Yue Fan, Ann. Phys. 321 (2006) 480-494] applied to tackling Newton-Leibniz integration over ket-bra projection operators, can be generalized to the technique of integration within Weyl ordered product (IWWOP) of operators. The Weyl ordering symbol is introduced to find the Wigner operator's Weyl ordering form {delta}(p,q) = {delta}(p - P){delta}(q - Q) , and to find operators' Weyl ordered expansion formula. A remarkable property is that Weyl ordering of operators is covariant under similarity transformation, so it has many applications in quantum statistics and signal analysis. Thus the invention of the IWWOP technique promotes the progress of Dirac's symbolic method.
NASA Technical Reports Server (NTRS)
Mukhopadhyay, V.; Newsom, J. R.
1982-01-01
A stability margin evaluation method in terms of simultaneous gain and phase changes in all loops of a multiloop system is presented. A universal gain-phase margin evaluation diagram is constructed by generalizing an existing method using matrix singular value properties. Using this diagram and computing the minimum singular value of the system return difference matrix over the operating frequency range, regions of guaranteed stability margins can be obtained. Singular values are computed for a wing flutter suppression and a drone lateral attitude control problem. The numerical results indicate that this method predicts quite conservative stability margins. In the second example if the eigenvalue magnitude is used instead of the singular value, as a measure of nearness to singularity, more realistic stability margins are obtained. However, this relaxed measure generally cannot guarantee global stability.
Lingua, Andrea; Marenchino, Davide; Nex, Francesco
2009-01-01
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
Membrane-mirror-based autostereoscopic display for tele-operation and teleprescence applications
NASA Astrophysics Data System (ADS)
McKay, Stuart; Mair, Gordon M.; Mason, Steven; Revie, Kenneth
2000-05-01
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.
Applications development of the ETA-10
NASA Astrophysics Data System (ADS)
Barkai, D.; Campostrini, M.; Moriarty, K. J. M.; Rebbi, C.
1987-07-01
The applications viewpoint and development aspects with respect to the ETA-10 multiprocessing supercomputer are presented. The general arguments are exemplified by a discussion of some parallel matrix operations and a multitasked Monte Carlo simulation technique.
Rémi BERRIET; Gérard FLEURY
2007-01-01
High Intensity Focused Ultrasound (HIFU) is now a recognized method for the non-invasive treatment of tumors, and transducers are required to have more and more capabilities. The most advanced HIFU transducers can produce enough power for thermal ablation and can also electronically steer and focus the power ultrasonic beam to create a defined volume necrosis using 2D transducer arrays. In
Photon counting detector for space applications optimized for both gated and non-gated operation
NASA Astrophysics Data System (ADS)
Prochazka, Ivan; Blazej, Josef; Kodet, Jan
2008-11-01
We are reporting our results in research and development in the field of avalanche semiconductor single photon detectors and their optimization for the selected space projects. Our goal was a development of a solid state photon counting detector capable of high precision photon arrival time tagging. For the application in laser time transfer via satellite the detector should be able to operate in both gated and non-gated modes; additionally the extremely high background photon flux should not disable the detector operation. We have developed the novel active quenching and gating electronics circuit, which enables both the gated and non-gated operation of the K14 Single Photon Avalanche Diode (SPAD). The performance of the optimized photon counting detector has been verified in a series of indoor calibration tests. The detection probability, timing resolution and detection delay stability have been measured in both operation modes under various background photon flux conditions. The detector design and construction is a promising candidate for the space project of Laser Time Transfer prepared by China. The experimental results are presented.
Uhrig, R.E. (Tennessee Univ., Knoxville, TN (United States) Oak Ridge National Lab., TN (United States))
1990-01-01
Application of neural networks to monitoring and decision making in the operation of nuclear power plants is being investigated under a US Department of Energy sponsored program at the University of Tennessee. Projects include the feasibility of using neural networks for the following tasks: (1) diagnosing specific abnormal conditions or problems in nuclear power plants, (2) detection of the change of mode of operation of the plant, (3) validating signals coming from detectors, (4) review of noise'' data from TVA's Sequoyah Nuclear Power Plant, and (5) examination of the NRC's database of Letter Event Reports'' for correlation of sequences of events in the reported incidents. Each of these projects and its status are described briefly in this paper. This broad based program has as its objective the definition of the state-of-the-art in using neural networks to enhance the performance of commercial nuclear power plants.
Manville, Albert; Hueckel, Greg
2004-09-01
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.
Application of hardware-in-the-loop simulation to operational test and evaluation
NASA Astrophysics Data System (ADS)
Cocanougher, David S.; Mirsky, Samuel A.; Card, Darrell B.
1999-07-01
The rapid advance of computer technology and advances in image generation and projection have provided unprecedented growth in the fidelity of hardware-in-the-loop (HITL) simulation. HITL simulation has improved to a level where it can support operational test and evaluation, often providing better insight into system performance than traditional open-air flight tests. This comes at a time of increasing open-air test costs and decreasing test budgets, two factors that are driving the movement for simulation based acquisition. We present two case studies on the application of HITL simulation to the operational test of the AGM-65 Maverick missile system. These studies demonstrate their fidelity of modern HITL simulation, highlight the benefits derived from this testing, and examine the cultural and technical impediments hindering the wider acceptance of simulation based acquisition efforts.
The application of total quality management principles to spacecraft mission operations
NASA Technical Reports Server (NTRS)
Sweetin, Maury
1993-01-01
By now, the philosophies of Total Quality Management have had an impact on every aspect of American industrial life. The trail-blazing work of Deming, Juran, and Crosby, first implemented in Japan, has 're-migrated' across the Pacific and now plays a growing role in America's management culture. While initially considered suited only for a manufacturing environment, TQM has moved rapidly into the 'service' areas of offices, sales forces, and even fast-food restaurants. The next logical step has also been taken - TQM has found its way into virtually all departments of the Federal Government, including NASA. Because of this widespread success, it seems fair to ask whether this new discipline is directly applicable to the profession of spacecraft operations. The results of quality emphasis on OAO Corporation's contract at JPL provide strong support for Total Quality Management as a useful tool in spacecraft operations.
The application of total quality management principles to spacecraft mission operations
NASA Astrophysics Data System (ADS)
Sweetin, Maury
1993-03-01
By now, the philosophies of Total Quality Management have had an impact on every aspect of American industrial life. The trail-blazing work of Deming, Juran, and Crosby, first implemented in Japan, has 're-migrated' across the Pacific and now plays a growing role in America's management culture. While initially considered suited only for a manufacturing environment, TQM has moved rapidly into the 'service' areas of offices, sales forces, and even fast-food restaurants. The next logical step has also been taken - TQM has found its way into virtually all departments of the Federal Government, including NASA. Because of this widespread success, it seems fair to ask whether this new discipline is directly applicable to the profession of spacecraft operations. The results of quality emphasis on OAO Corporation's contract at JPL provide strong support for Total Quality Management as a useful tool in spacecraft operations.
The Sixth Annual Workshop on Space Operations Applications and Research (SOAR 1992)
NASA Technical Reports Server (NTRS)
Krishen, Kumar (editor)
1993-01-01
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.
Nikitin, A G
2011-01-01
We present a collection of matrix valued shape invariant potentials which give rise to new exactly solvable problems of SUSY quantum mechanics. It includes all irreducible matrix superpotentials of the generic form $W=kQ+\\frac1k R+P$ where $k$ is a variable parameter, $Q$ is the unit matrix multiplied by a function of independent variable $x$, and $P$, $R$ are hermitian matrices depending on $x$. In particular we recover the Pron'ko-Stroganov "matrix Coulomb potential" and all known scalar shape invariant potentials of SUSY quantum mechanics.
Designing User Interfaces for Smart-Applications for Operating Rooms and Intensive Care Units
NASA Astrophysics Data System (ADS)
Kindsmüller, Martin Christof; Haar, Maral; Schulz, Hannes; Herczeg, Michael
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.
Application of photogrammetry to work in nuclear power plants in operation
Abella, A.P.; Balsalobre, F.S.
1987-01-01
In the evolution of requirements applicable to nuclear safety-related components and the obtainment of as-built data for a great variety of jobs performed in nuclear power plants, photogrammetry proves to be a very useful tool for design, manufacture, erection, maintenance, and operation. The METADAT data acquisition system developed by Empresarios Agrupados has a wide range of applications, depending on the degree of precision required. The F-3 system is capable of obtaining a precision of 1:10.000, to 0.10 mm in determined zones, through the use of wide-angle lenses without optical distortions or aberrations. In cases where such a high degree of precision is not necessary, as in piping run modifications, conduits, or cable trays, the F-2 system can be used.
Application of the ADR method for the evaluation of the scattering matrix of an open ended coaxial
Felipe L. Peñaranda-Foix; José M. Catalá-Civera; Jesús García Bogado; P. J. Plaza-Gonzalez; José I. Herranz-Herruzo
2007-01-01
The use of ADR method for locating poles near the real axis is proposed when the scattering matrix for an open ended coaxial is analysed radiating over a multilayer structure ended in a perfect electrical wall. So a better and faster integral evaluation is made once the subintegral function behaviour is known.
First-Principles T-Matrix Theory with Application to the 6 eV Satellite in Ni
M. Springer; F. Aryasetiawan; K. Karlsson
1998-01-01
In photoemission spectra of strongly correlated systems one usually observes a satellite structure below the main peak. Description of such satellite structures in the commonly used GW approximation has been found to be insufficient. To account for these satellite structures that originate from short-range correlations, we have developed a T-matrix formalism for performing ab initio calculations on real systems. The
THE APPLICATION OF THE HARRIS MATRIX TO SAN ROCK ART AT MAIN CAVES NORTH, KWAZULU-NATAL
THEMBI RUSSELL
Fig. 1: View of Main Caves, Giant's Castle Game Reserve. The layers of superimposition of San rock paintings at Main Caves North, Giant's Castle Game Reserve were analysed using the Harris matrix to illustrate the sequence of painted 29' E OTH 'styles'. The results of the analysis at Main Caves North are IRA ' described and compared with the Four
and circulant matrices. Generally speaking, it allows to deal with matrices that have reduced degrees of freedom. Our interest arises in particular from concate- nated block-Hankel matrices that appear typically involve at each iteration the singular value decomposition (SVD) of a structured matrix Y = B
Inkyung Jung; Jaehyung Lee; Soo-young Lee; Dongsup Kim
2008-01-01
BACKGROUND: Nonnegative matrix factorization (NMF) is a feature extraction method that has the property of intuitive part-based representation of the original features. This unique ability makes NMF a potentially promising method for biological sequence analysis. Here, we apply NMF to fold recognition and remote homolog detection problems. Recent studies have shown that combining support vector machines (SVM) with profile-profile alignments
Code of Federal Regulations, 2014 CFR
2014-10-01
...permit application, drilling program, and operations plan at the same time? 3261.15 Section 3261.15 Public Lands: Interior...permit application, drilling program, and operations plan at the same time? You may submit your completed and signed...
Plotkin, Joshua B.
PhD Recent Graduates with background in Distributed Systems. Virtualization, Distributed SystemsD in Computer Science * Must have knowledge/experience building virtual machines, distributed systems, Application Servers or Operating Systems Global Business Incubator Location Palo Alto PURPOSE
Code of Federal Regulations, 2014 CFR
2014-04-01
...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)...
Code of Federal Regulations, 2012 CFR
2012-04-01
...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)...
Code of Federal Regulations, 2013 CFR
2013-04-01
...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)...
Code of Federal Regulations, 2010 CFR
2010-04-01
...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)...
Code of Federal Regulations, 2011 CFR
2011-04-01
...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)...
Code of Federal Regulations, 2011 CFR
2011-07-01
... 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 RHODE...
Code of Federal Regulations, 2013 CFR
2013-07-01
...2013-07-01 2013-07-01 false Surface mining permit applications-minimum requirements... Mineral Resources OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT... PROGRAMS FOR THE CONDUCT OF SURFACE MINING OPERATIONS WITHIN EACH STATE SOUTH...
NASA Astrophysics Data System (ADS)
Fan, Hong-yi
2007-04-01
Via the route of applying Newton-Leibniz integration rule to Dirac's symbolic operators, we show that the density operator e-?H, where H is multi-mode quadratic interacting boson operators, is a mapping of symplectic transformation in the coherent state representation appearing in the form of non-symmetric ket-bra operator integration. By virtue of the technique of integration within an ordered product (IWOP) of operators, we deduce its normally ordered form which directly leads to the generalized partition function formula and the Wigner function. Some new representations, such as displacement-squeezing correlated squeezed coherent states, constructed by the IWOP technique, also bring convenience in deriving partition functions.
NASA Astrophysics Data System (ADS)
Stajner, I.; Manikin, G.; Draxler, R.; Kondragunta, S.; Wedmark, K.
2012-12-01
NOAA provides operational predictions of wildfire smoke nationwide and operational predictions of airborne dust from dust storms over the contiguous 48 states. These predictions are produced beyond midnight of the following day at 12km resolution and 1 hour time intervals and are distributed in numerical format and in graphical format at http://airquality.weather.gov/. The predictions combine NOAA National Centers for Environmental Prediction (NCEP) operational Nonhydrostatic Mesoscale Model on Arakawa B-grid (NMMB) weather predictions with the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) dispersion model to provide standalone predictions of wildfire smoke and predictions of dust from dust storms, both of which have highly variable intermittent sources. Smoke sources are based on NOAA/NESDIS analysis of satellite imagery for detection of smoke source locations that is combined with US Forest Service's BlueSky framework to estimate smoke emissions. Dust source locations are based on a satellite climatology of the frequency of dust emissions. Dust is emitted in the model when threshold velocity is exceeded and the emissions are modulated by model predictions of the latent and sensible heat fluxes to account for fluctuations in soil moisture. Routine verification of smoke and dust predictions relies on satellite retrievals of smoke and dust column integrals, which have been developed for this application. Recent system updates include dust predictions, which were implemented as a new operational product in 2012 and the NMMB weather model, which was implemented at NCEP in October of 2011. With widespread dust storms the predictions sometimes take longer than desired and ways of reducing the run time for predictions are being explored. Examples of predictions and verification for recent dust storms and wildfires will be shown.OAA's operational prediction of wildfire smoke concentrations on August 8, 2012 at 20 UT.
On the suitability and application of MCrAlY coatings under various operating conditions
Sahoo, P. [Sermatech International Inc., Limerick, PA (United States); Goward, G.W. [Goward Inc., Clinton, CT (United States)
1995-12-31
The need for protective coatings has dramatically increased on hot section parts of gas turbine engines and other heat engines used in non-flight applications. In the past two decades this has led to increased use of thermally sprayed MCrAlY coatings, both as stand-alone overlay and as a bond coat for thermal barrier coatings. Many of the state-of-art MCrAlY coatings are aero-derived and do not necessarily perform as expected in the conditions typical of land-based and marine gas turbines and diesel engines. The lower grade fuels, water addition to lower NO{sub x} levels, longer service life between overhaul and widely varying operating temperatures add to the complexity in the selection of appropriate coatings. This paper reviews the current art and technology of thermally sprayed MCrAlY coatings. The fundamental issues of hot corrosion and oxidation and the differences experienced under varying operating conditions are discussed. The differences in the service conditions of various applications of gas turbine engines and their effect on the coatings are discussed. Noting that a substantial amount of laboratory and field data have been generated, some selected performance results are discussed on various coatings.
Chang Wen Chen; Jiebo Luo; Kevin J. Parker
1998-01-01
Image segmentation remains one of the major challenges in image analysis. In medical applications, skilled operators are usually employed to extract the desired regions that may be anatomically separate but statistically indistinguishable. Such manual processing is subject to operator errors and biases, is extremely time consuming, and has poor reproducibility. We propose a robust algorithm for the segmentation of three-dimensional
J. G. Richardson; J. L. Morrison; R. A. Morneau; M. C. OBrien; M. J. Rudin
1992-01-01
This report summarizes the application of the Performance-Based Technology Selection Filter (PBTSF) developed for the Idaho National Laboratory's Buried Waste Integrated Demonstration Program as applied to remediation activities conducted at the Teledyne Wah Chang Albany (TWCA) Superfund Site, Operable Unit One. The remedial action at the TWCA Operable Unit One consisted of solidification, excavation, transportation, and monocell disposal of the
NASA Astrophysics Data System (ADS)
Moradi, Ali; Pramanik, Sumit; Ataollahi, Forough; Khalil, Alizan Abdul; Kamarul, Tunku; Pingguan-Murphy, Belinda
2014-12-01
Native cartilage matrix derived (CMD) scaffolds from various animal and human sources have drawn attention in cartilage tissue engineering due to the demonstrable presence of bioactive components. Different chemical and physical treatments have been employed to enhance the micro-architecture of CMD scaffolds. In this study we have assessed the typical effects of physical cross-linking methods, namely ultraviolet (UV) light, dehydrothermal (DHT) treatment, and combinations of them on bovine articular CMD porous scaffolds with three different matrix concentrations (5%, 15% and 30%) to assess the relative strengths of each treatment. Our findings suggest that UV and UV–DHT treatments on 15% CMD scaffolds can yield architecturally optimal scaffolds for cartilage tissue engineering.
NASA Astrophysics Data System (ADS)
Zhang, Zhongzhi; Lin, Yuan; Guo, Xiaoye
2015-06-01
The eigenvalues of the transition matrix for random walks on a network play a significant role in the structural and dynamical aspects of the network. Nevertheless, it is still not well understood how the eigenvalues behave in small-world and scale-free networks, which describe a large variety of real systems. In this paper, we study the eigenvalues for the transition matrix of a network that is simultaneously scale-free, small-world, and clustered. We derive explicit simple expressions for all eigenvalues and their multiplicities, with the spectral density exhibiting a power-law form. We then apply the obtained eigenvalues to determine the mixing time and random target access time for random walks, both of which exhibit unusual behaviors compared with those for other networks, signaling discernible effects of topologies on spectral features. Finally, we use the eigenvalues to count spanning trees in the network.
NASA Astrophysics Data System (ADS)
Rousselet, Benoit; Gibiat, Vincent; Guilain, Stéphane; Lefebvre, Alain
2014-12-01
A new method for measuring acoustic transfer matrixes with flow has been developed. It is based on two-load technique. Great improvements were obtained on specific calibration of the connections. We present here the calibration principles and validation. Measurements of basic resonating systems, first without flow then with flow up to Mach 0.2 clearly validated the accuracy of the technique, even under extreme flow conditions. This technique was developed to allow the determination of the acoustic behavior of an automotive engine intake line, comprising a compressor. Measurements of the transfer matrix of an automotive compressor are presented without flow then under realistic engine conditions. The results obtained are compared to those of a basic acoustic model of the compressor.
Marc, J.L.; Granier, W.; Pradel, A.; Ribes, M.; Richard, T.; Allegre, J.; Lefebvre, P. [Univ. Montpellier-2 (France)
1994-12-31
A new route for preparing CdX (X = S, Se, Te, S+Se) nanocrystallites dispersed in a sodium borosilicate glass matrix from a hydrogel is proposed. Chalcogenizing complexing molecules -- for instance a mixture of NH{sub 4}SCN + H{sub 2}SeO{sub 3} -- introduced in the starting solution allowed an in situ crystallite preparation concomitant to gel densification. Prevention of crystallite oxidation is thus obtained. Moreover, coalescence is minimized because of the low gel-glass transition temperature. Low temperature absorption spectra have been interpreted in terms of exciton and electron-hole confinements, accounting for both an intrinsic broadening of energy states inside each nanocrystal and a Gaussian size distribution. Crystallite sizes and size dispersion can be adjusted by changing the initial Cd concentration. The crystallinity of the nanoparticles without change in dispersion is strongly improved by thermal treatment above the T{sub g} of the glass matrix.