Now showing items 3709-3728 of 3906

    • A UNIX Micro Requirement for Computer Science Majors 

      Fox, Edward A.; Birch, Sandra E. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1986), TR-86-11
      In the fall of 1985, over 230 freshmen majoring in computer science at Virginia Tech purchased microcomputers running the UNIX operating system, because of a vote in spring 1983 by the faculty of the Department of Computer ...
    • Unsteady nanoscale thermal transport across a solid-fluid interface 

      Balasubramanian, Ganesh; Banerjee, Soumik; Puri, Ishwar K. (American Institute of Physics, 2008-09-15)
      We simulate unsteady nanoscale thermal transport at a solid-fluid interface by placing cooler liquid-vapor Ar mixtures adjacent to warmer Fe walls. The equilibration of the system towards a uniform overall temperature is ...
    • Unsupervised Deconvolution of Dynamic Imaging Reveals Intratumor Vascular Heterogeneity and Repopulation Dynamics 

      Chen, Li; Choyke, Peter L.; Wang, Niya; Clarke, Robert; Bhujwalla, Zaver M.; Hillman, Elizabeth M. C.; Wang, Ge; Wang, Yue (PLOS, 2014-11-07)
      With the existence of biologically distinctive malignant cells originated within the same tumor, intratumor functional heterogeneity is present in many cancers and is often manifested by the intermingled vascular compartments ...
    • Unsupervised discovery of solid-state lithium ion conductors 

      Zhang, Ying; He, Xingfeng; Chen, Zhiqian; Bai, Qiang; Nolan, Adelaide M.; Roberts, Charles A.; Banerjee, Debasish; Matsunaga, Tomoya; Mo, Yifei; Ling, Chen (2019-11-20)
      Although machine learning has gained great interest in the discovery of functional materials, the advancement of reliable models is impeded by the scarcity of available materials property data. Here we propose and demonstrate ...
    • Unsupervised Spatial Event Detection in Targeted Domains with Applications to Civil Unrest Modeling 

      Zhao, Liang; Chen, Feng; Dai, Jing; Hua, Ting; Lu, Chang-Tien; Ramakrishnan, Naren (PLOS, 2014-10-28)
      Twitter has become a popular data source as a surrogate for monitoring and detecting events. Targeted domains such as crime, election, and social unrest require the creation of algorithms capable of detecting events pertinent ...
    • Update on Multirate Timestepping Methods for Hyperbolic Conservation Laws 

      Constantinescu, Emil M.; Sandu, Adrian (Department of Computer Science, Virginia Polytechnic Institute & State University, 2007-03-01), TR-07-12
      This paper constructs multirate time discretizations for hyperbolic conservation laws that allow different timesteps to be used in different parts of the spatial domain. The proposed family of discretizations is second ...
    • Upper limit for the modulation bandwidth of a quantum dot laser 

      Asryan, Levon V.; Suris, R. A. (AIP Publishing, 2010-05-01)
      We derive a closed-form expression for the upper limit for the modulation bandwidth of a semiconductor quantum dot (QD) laser. The highest possible bandwidth increases directly with overlap integral of the electron and ...
    • UPS-indel: a Universal Positioning System for Indels 

      Hasan, Mohammad Shabbir; Wu, Xiaowei; Watson, Layne T.; Li, Zhiyi; Zhang, Liqing (Nature, 2017-10-26)
      Storing biologically equivalent indels as distinct entries in databases causes data redundancy, and misleads downstream analysis. It is thus desirable to have a unified system for identifying and representing equivalent ...
    • Urban influence on the concentration and composition of submicron particulate matter in central Amazonia 

      de Sa, Suzane S.; Palm, Brett B.; Campuzano-Jost, Pedro; Day, Douglas A.; Hu, Weiwei; Isaacman-VanWertz, Gabriel; Yee, Lindsay D.; Brito, Joel; Carbone, Samara; Ribeiro, Igor O.; Cirino, Glauber G.; Liu, Yingjun; Thalman, Ryan; Sedlacek, Arthur; Funk, Aaron; Schumacher, Courtney; Shilling, John E.; Schneider, Johannes; Artaxo, Paulo; Goldstein, Allen H.; Souza, Rodrigo A. F.; Wang, Jian; McKinney, Karena A.; Barbosa, Henrique; Alexander, M. Lizabeth; Jimenez, Jose L.; Martin, Scot T. (European Geophysical Union, 2018-08-23)
      An understanding of how anthropogenic emissions affect the concentrations and composition of airborne particulate matter (PM) is fundamental to quantifying the influence of human activities on climate and air quality. The ...
    • Urban pollution greatly enhances formation of natural aerosols over the Amazon rainforest 

      Shrivastava, Manish; Andreae, Meinrat O.; Artaxo, Paulo; Barbosa, Henrique M. J.; Berg, Larry K.; Brito, Joel; Ching, Joseph; Easter, Richard C.; Fan, Jiwen; Fast, Jerome D.; Feng, Zhe; Fuentes, Jose D.; Glasius, Marianne; Goldstein, Allen H.; Alves, Eliane Gomes; Gomes, Helber; Gu, Dasa; Guenther, Alex; Jathar, Shantanu H.; Kim, Saewung; Liu, Ying; Lou, Sijia; Martin, Scot T.; McNeill, V. Faye; Medeiros, Adan; de Sa, Suzane S.; Shilling, John E.; Springston, Stephen R.; Souza, R. A. F.; Thornton, Joel A.; Isaacman-VanWertz, Gabriel; Yee, Lindsay D.; Ynoue, Rita; Zaveri, Rahul A.; Zelenyuk, Alla; Zhao, Chun (Springer Nature, 2019-03-05)
      One of the least understood aspects in atmospheric chemistry is how urban emissions influence the formation of natural organic aerosols, which affect Earth's energy budget. The Amazon rainforest, during its wet season, is ...
    • Usability Evaluation in Virtual Environments: Classification and Comparison of Methods 

      Bowman, Doug A.; Gabbard, Joseph L.; Hix, Deborah (Department of Computer Science, Virginia Polytechnic Institute & State University, 2001), TR-01-17
      Virtual environments (VEs) are a relatively new type of human-computer interface in which users perceive and act in a three-dimensional world. The designers of such systems cannot rely solely on design guidelines for ...
    • Usability Inspection Report of iLumina 

      Shivakumar, Priya; Hartson, H. Rex; Perez, Victor M. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2002-09-01), TR-02-20
      iLumina is a digital library of sharable undergraduate teaching resource materials for science, mathematics, technology, and engineering being developed by the University of North Carolina at Wilmington (UNCW), Collegis, ...
    • Usability Inspection Report of NCSTRL 

      Hartson, H. Rex; Shivakumar, Priya (Department of Computer Science, Virginia Polytechnic Institute & State University, 2002-04-01), TR-02-08
      An evaluation report of the www.ncstrl.org site outlining usability problems and solutions to these problems.
    • Usability of Tablet PC as a Remote Control Device for Biomedical Data Visualization 

      Narayan, Michael; Chen, Jian; Pérez-Quiñones, Manuel A. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2004), TR-04-26
      Interaction through multi-platform user interfaces (MPUIs), is increasingly being used in battlefield applications, telemedicine, classroom education, and engineering applications. Some of the uniqueness of these non-traditional ...
    • Use and Usability in a Digital Library Search System 

      France, Robert K.; Nowell, Lucy Terry; Fox, Edward A.; Saad, Rani A.; Zhao, Jianxin (Virginia Tech Digital Library Research Laboratory, 1999)
      Digital libraries must reach out to users from all walks of life, serving information needs at all levels. To do this, they must attain high standards of usability over an extremely broad audience. This paper details the ...
    • Use of a Sandwich Plate System in a Virginia Bridge 

      Cousins, Thomas E.; Murray, T.M.; Harris, D.K. (Virginia Center for Transportation Innovation and Research, 2009-05-01)
      The deterioration of the nation's civil infrastructure has prompted the investigation of numerous solutions to the problem. Some of these solutions have come in the form of innovative materials for new construction, whereas ...
    • The Use of Complexity Metrics Throughout the Software Lifecycle 

      Henry, Sallie M.; Wake, Steven A.; Li, Wei (Department of Computer Science, Virginia Polytechnic Institute & State University, 1992-05-01), TR-92-59
      Software metrics attempt to uncover difficult or complex components of a software system. The hypothesis is that complex components are more difficult to understand, hence they are hard to maintain and more prone to error. ...
    • The Use of Computer Modulated Drawing in the Teaching of Art 

      Williams, Charles M. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1974), CS74030-R
      A hardware-software process is described which automatically creates computer modulated drawings from an artist's own works. The process allows a drawing to act as a constant source of data for a series of renditions of ...
    • Use of Imaging Biomarkers to Assess Perfusion and Glucose Metabolism in the Skeletal Muscle of Dystrophic Mice 

      Ahmad, Nabeel; Welch, Ian; Grange, Robert; Hadway, Jennifer; Dhanvantari, Savita; Hill, David; Lee, Ting-Yim; Hoffman, Lisa M. (2011-06-04)
      Background Duchenne muscular dystrophy (DMD) is a severe neuromuscular disease that affects 1 in 3500 boys. The disease is characterized by progressive muscle degeneration that results from mutations in or loss of the ...
    • Use of Response Surface Metamodels for Identification of Stiffness and Damping Coefficients in a Simple Dynamic System 

      Rutherford, A.C.; Inman, D.J.; Park, G.; Hemez, F.M. (Hindawi, 2005-01-01)
      Metamodels have been used with success in many areas of engineering for decades but only recently in the field of structural dynamics. A metamodel is a fast running surrogate that is typically used to aid an analyst or ...