Now showing items 2440-2459 of 3571

    • Packing Characteristics of Aggregate with Consideration of Particle size and Morphology 

      Miao, Yinghao; Liu, Xin; Hou, Yue; Li, Juan; Wu, Jiaqi; Wang, Linbing (MDPI, 2019-02-28)
      The packing characteristics of aggregates are very important for aggregate blend design, which is closely related to the performance of mixtures. In this study, an indoor packing experiment was designed to investigate the ...
    • The Pagenumber of Genus g Graph is 0(g) 

      Heath, Lenwood S.; Istrail, Sorin (Department of Computer Science, Virginia Polytechnic Institute & State University, 1990), TR-90-21
      In 1979, Berhart and Kainen conjectured that graphs of fixed genus g greater than or equal to 1 have unbounded pagenumber. This proves that genus g graphs can be embedded in 0(g) pages, thus disproving the conjecture. ...
    • The Pagenumber of k-Trees is 0(k) 

      Ganley, Joseph L.; Heath, Lenwood S. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1995-10-01), TR-95-17
      A k-tree is a graph defined inductively in the following way: the complete graph K(sub-k) is a K-tree, and if G is a k-tree, then the graph resulting from adding a new vertex to k vertices inducing a K(sub-k) in G is also ...
    • Parallel Adaptive GMRES Implementations for Homotopy Methods 

      Sosonkina, Masha; Allison, Donald C. S.; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1997-11-01), TR-97-18
      The success of homotopy methods in solving large-scale optimization problems and nonlinear systems of equations depends heavily on the solution of large sparse nonsymmetric linear systems on parallel architectures. Iterative ...
    • Parallel Cost Analysis of Adaptive GMRES Implementations for Homotopy Methods 

      Sosonkina, Masha; Allison, Donald C. S.; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1997-12-01), TR-97-22
      The success of homotopy methods in solving large-scale optimization problems and nonlinear systems of equations depends heavily on the solution of large sparse nonsymmetric linear systems on parallel architectures. Iterative ...
    • Parallel Deterministic and Stochastic Global Minimization of Functions with Very Many Minima 

      Easterling, David R.; Watson, Layne T.; Madigan, Michael L.; Castle, Brent S.; Trosset, Michael W. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2011), TR-11-19
      The optimization of three problems with high dimensionality and many local minima are investigated under five different optimization algorithms: DIRECT, simulated annealing, Spall’s SPSA algorithm, the KNITRO package, and ...
    • Parallel devices having balanced switching current and power 

      Virginia Tech Intellectual Properties, Inc.; Toyota Motor Engineering & Manufacturing North American, Inc.; Wang, Chi-Ming; Mao, Yincan; Miao, Zichen; Ngo, Khai D. (United States Patent and Trademark Office, 2018-10-30)
      A power circuit includes a power source for providing electrical power and two driving transistors being disposed in parallel and receiving electrical power from the power source. Each of the two driving transistors includes ...
    • Parallel Discrete Event Simulation: A Modeling MethodologicalPerspective 

      Page, Ernest H.; Nance, Richard E. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1994), TR-94-05
      The field of parallel discrete event simulation is entering a period of self-assessment. Fifteen years of investigation has seen great strides in techniques for efficiently executing discrete event simulations on parallel ...
    • Parallel ELLPACK for Shared Memory Multiprocessors 

      Ribbens, Calvin J.; Pitts, George G.; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1992), TR-92-56
      This paper describes a parallel version of ELLPACK for shared memory multiprocessors. ELLPACK is a system for numerically solving elliptic PDEs. It consists of a very high level language for defining PDE problems and ...
    • Parallel Evolution of Genome Streamlining and Cellular Bioenergetics across the Marine Radiation of a Bacterial Phylum 

      Getz, Eric W.; Tithi, Saima Sultana; Zhang, Liqing; Aylward, Frank O. (American Society for Microbiology, 2018-09)
      Diverse bacterial and archaeal lineages drive biogeochemical cycles in the global ocean, but the evolutionary processes that have shaped their genomic properties and physiological capabilities remain obscure. Here we track ...
    • Parallel Global Aircraft Configuration Design Space Exploration 

      Baker, Chuck A.; Watson, Layne T.; Grossman, Bernard; Mason, William H.; Haftka, Raphael T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2000), TR-00-07
      The preliminary design space exploration for large,interdisciplinary engineering problems is often a difficult and time-consuming task. General techniques are needed that efficiently and methodically search the design ...
    • A Parallel Implementation of the Ensemble Kalman Filter Based on Modified Cholesky Decomposition 

      Nino, ED; Sandu, A; Deng, X
      This paper discusses an efficient parallel implementation of the ensemble Kalman filter based on the modified Cholesky decomposition. The proposed implementation starts with decomposing the domain into sub-domains. In each ...
    • Parallel Load Balancing Strategies for Ensembles of Stochastic Biochemical Simulations 

      Ahn, Tae-Hyuk; Sandu, Adrian; Watson, Layne T.; Shaffer, Clifford A.; Cao, Yang; Baumann, William T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2010-12-01), TR-10-17
      The evolution of biochemical systems where some chemical species are present with only a small number of molecules, is strongly influenced by discrete and stochastic effects that cannot be accurately captured by continuous ...
    • The Parallel Performance of Schwarz Splitting 

      Ribbens, Calvin J.; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1990), TR-90-34
      We describe several experiments with implementations of Schwarz splitting algorithms for the numerical solution of elliptic partial differential equations. Results from experiments comparing several variations of the basic ...
    • Parallel scalability study of three dimensional additive Schwarz preconditioners in non-overlapping domain decomposition 

      Giraud, L.; Haidar, A.; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2007), TR-07-03
      In this paper we study the parallel scalability of variants of additive Schwarz preconditioners for three dimensional non-overlapping domain decomposition methods. To alleviate the computational cost, both in terms of ...
    • Parallel Solution of Generalized Symmetric Tridiagonal Eigenvalue Problems on Shared Memory Multiprocessors 

      Ribbens, Calvin J.; Beattie, Christopher A. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1992), TR-92-47
      This paper describes and compares two methods for solving a generalized eigenvalue problem , where T and S are both real symmetric and tridiagonal, and S is positive definite, and the target architecture is a shared memory ...
    • Parallel_plate waveguide with sinusoidally perturbed boundaries 

      Nayfeh, Ali H.; Asfar, Omar R. (American Institute of Physics, 1974)
      The method of multiple scales is used to obtain a uniformly valid asymptotic expansion for the propagation of TM modes on a parallel_plate waveguide with perfectly conducting boundary surfaces that are sinusoidally perturbed ...
    • Paramagnetic Structures within a Microfluidic Channel for Enhanced Immunomagnetic Isolation and Surface Patterning of Cells 

      Sun, Chen; Hassanisaber, Hamid; Yu, Richard; Ma, Sai; Verbridge, Scott; Lu, Chang (Nature, 2016-07-08)
      In this report, we demonstrate a unique method for embedding magnetic structures inside a microfluidic channel for cell isolation. We used a molding process to fabricate these structures out of a ferrofluid of cobalt ferrite ...
    • Paramecium swimming in capillary tube 

      Jana, S.; Um, S. H.; Jung, S. (American Institute of Physics, 2012-04-01)
      Swimming organisms in their natural habitat need to navigate through a wide range of geometries and chemical environments. Interaction with boundaries in such situations is ubiquitous and can significantly modify the ...
    • Parameter Estimation for a Mathematical Model of the Cell Cycle in Frog Eggs 

      Zwolak, Jason W.; Tyson, John J.; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2002-08-01), TR-02-18
      Parameter values for a kinetic model of teh nuclear replication-division cycle in frog eggs are estimated by fitting solutions of the kinetic equations (nonlinear ordinary differential equations) to a suite of experimental ...