Now showing items 1330-1349 of 1803

    • Quantification of the Tradeoff between Test Sensitivity and Test Frequency in a COVID-19 Epidemic—A Multi-Scale Modeling Approach 

      Forde, Jonathan E.; Ciupe, Mihaela Stanca (MDPI, 2021-03-11)
      Control strategies that employ real time polymerase chain reaction (RT-PCR) tests for the diagnosis and surveillance of COVID-19 epidemic are inefficient in fighting the epidemic due to high cost, delays in obtaining ...
    • Quantifying climate sensitivity and climate-driven change in North American amphibian communities 

      Miller, David A. W.; Grant, Evan H. Campbell; Muths, Erin; Amburgey, Staci M.; Adams, Michael J.; Joseph, Maxwell B.; Waddle, J. Hardin; Johnson, Pieter T. J.; Ryan, Maureen E.; Schmidt, Benedikt R.; Calhoun, Daniel L.; Davis, Courtney L.; Fisher, Robert N.; Green, David M.; Hossack, Blake R.; Rittenhouse, Tracy A. G.; Walls, Susan C.; Bailey, Larissa L.; Cruickshank, Sam S.; Fellers, Gary M.; Gorman, Thomas A.; Haas, Carola A.; Hughson, Ward; Pilliod, David S.; Price, Steven J.; Ray, Andrew M.; Sadinski, Walt; Saenz, Daniel; Barichivich, William J.; Brand, Adrianne; Brehme, Cheryl S.; Dagit, Rosi; Delaney, Katy S.; Glorioso, Brad M.; Kats, Lee B.; Kleeman, Patrick M.; Pearl, Christopher A.; Rochester, Carlton J.; Riley, Seth P. D.; Roth, Mark; Sigafus, Brent H. (2018-09-25)
      Changing climate will impact species' ranges only when environmental variability directly impacts the demography of local populations. However, measurement of demographic responses to climate change has largely been limited ...
    • Quantifying Hydrological Impacts of Climate Change Uncertainties on a Watershed in Northern Virginia 

      Baran, Ayden A.; Moglen, Glenn E.; Godrej, Adil N. (2019-12)
      Forecasted changes to climate were used to model variations in the streamflow characteristics of a northern Virginia catchment. Two emission scenarios were applied from international climate projections along with four ...
    • Quantifying Interhospital Patient Sharing as a Mechanism for Infectious Disease Spread 

      Huang, Susan S.; Avery, Takuser R.; Song, Yeohan H.; Elkins, Kristen R.; Nguyen, Christopher C.; Nutter, Sandra K.; Nafday, Alaka. A.; Condon, Curtis J.; Chang, Michael T.; Chrest, David; Boos, John; Bobashev, Georgiy; Wheaton, William; Frank, Steven A.; Platt, Richard; Lipsitch, Marc; Bush, Robin M.; Eubank, Stephen; Burke, Donald S.; Lee, Bruce Y. (University of Chicago Press, 2010-11)
      BACKGROUND. Assessments of infectious disease spread in hospitals seldom account for interfacility patient sharing. This is particularly important for pathogens with prolonged incubation periods or carrier states. METHODS. ...
    • Quantitative Proteomics Reveals the Beneficial Effects of Low Glucose on Neuronal Cell Survival in an in vitro Ischemic Penumbral Model 

      Li, Hua; Kittur, Farooqahmed S.; Hung, Chiu-Yueh; Li, P. Andy; Ge, Xinghong; Sane, David C.; Xie, Jiahua (2020-09-01)
      Understanding proteomic changes in the ischemic penumbra are crucial to rescue those salvageable cells and reduce the damage of an ischemic stroke. Since the penumbra region is dynamic with heterogeneous cells/tissues, ...
    • Quantum interference measurement of spin interactions in a bio-organic/semiconductor device structure 

      Deo, Vincent; Zhang, Yao; Soghomonian, Victoria G.; Heremans, Jean J. (Springer Nature, 2015-03-30)
      Quantum interference is used to measure the spin interactions between an InAs surface electron system and the iron center in the biomolecule hemin in nanometer proximity in a bio-organic/semiconductor device structure. The ...
    • Race and/or Reconciliation : Proceedings of the 3rd Conference on Veterans in Society 

      VT Veterans Studies Group; Dubinsky, James M.; Pencek, Bruce; Davitt, Marcia; Catherwood-Ginn, Jon; Quigley, Paul; Reed, Wornie L.; Fields, Cynthia; Grady, Judy; Jones, Cheryl; Karnes, Daniel; Stevers, Tammy; Miller, COL John; Morse, Patricia; Sandoz, Elizabeth; Waalkes, Ruth; Hart, D. Alexis; Williamson, Richard A.; Lembcke, Jerry; Kennedy, John C.; Hepburn, Sharon A. Roger; Musil, Donna; Price, Stuart V.; Giguere, Joy M.; Duffey, Suellynn; Grant, Lenny; Craig, Jim; Grohowski, Mariana; Dahlstrand, Kate; Gunsallus, April L.; Nobles, Heidi; Davitt, Marcia; Virginia Tech. Center for the Study of Rhetoric in Society (Virginia Tech, 2016)
      The Veterans in Society (ViS) research group is proud to present the proceedings of the Third Conference on Veterans in Society: Race and/or Reconciliation, with papers that represent a wide range of research and community ...
    • Radar-Based Over-the-Air Message Generator for Accelerating Connected Vehicle Deployment 

      Viray, Reginald; Gorman, Thomas; Doerzaph, Zachary R. (Connected Vehicle/Infrastructure University Transportation Center (CVI-UTC), 2016-10-15)
      The market penetration levels needed to realize the full safety, economic, and environmental benefits of connected vehicle (CV) systems will not be met for some time. During the transition, it would be beneficial if data ...
    • Radiation Mapping in Post-Disaster Environments Using an Autonomous Helicopter 

      Towler, Jerry; Krawiec, Bryan; Kochersberger, Kevin B. (MDPI, 2012-07-05)
      Recent events have highlighted the need for unmanned remote sensing in dangerous areas, particularly where structures have collapsed or explosions have occurred, to limit hazards to first responders and increase their ...
    • Radiation Search Operations using Scene Understanding with Autonomous UAV and UGV 

      Christie, Gordon A.; Shoemaker, Adam; Kochersberger, Kevin B.; Tokekar, Pratap; McLean, Lance; Leonessa, Alexander (Virginia Tech, 2016-08-31)
      Autonomously searching for hazardous radiation sources requires the ability of the aerial and ground systems to understand the scene they are scouting. In this paper, we present systems, algorithms, and experiments to ...
    • Radioactive Cobalt(II) Removal from Aqueous Solutions Using a Reusable Nanocomposite: Kinetic, Isotherms, and Mechanistic Study 

      Zhang, Xiaotao; Wang, Ximing; Chen, Zhangjing (MDPI, 2017-11-24)
      A lignocellulose/montmorillonite (LMT) nanocomposite was prepared as a reusable adsorbent for cobalt(II) ions, and characterized by nitrogen (N2) adsorption/desorption isotherm, X-ray Diffraction (XRD), Scanning ...
    • Randomized Manipulation of Early Cognitive Experience Impacts Adult Brain Structure 

      Farah, Martha J.; Sternberg, Saul; Nichols, Thomas A.; Duda, Jeffrey T.; Lohrenz, Terry; Luo, Yi; Sonnier, Libbie; Ramey, Sharon L.; Montague, P. Read; Ramey, Craig T. (Massachusetts Institute of Technology, 2021)
      Does early exposure to cognitive and linguistic stimulation impact brain structure? Or do genetic predispositions account for the co-occurrence of certain neuroanatomical phenotypes and a tendency to engage children in ...
    • Rapid Screening of Transformed Data Leaks with Efficient Algorithms and Parallel Computing 

      Shu, Xiaokui; Zhang, Jing; Yao, Danfeng (Daphne); Feng, Wu-Chun (ACM, 2015-03)
      The leak of sensitive data on computer systems poses a serious threat to organizational security. Organizations need to identify the exposure of sensitive data by screening the content in storage and transmission, i.e., ...
    • Rapporteur Report: Understanding the Dark Web and its Implications for Policy 

      Jardine, Eric (Virginia Tech, 2018-05)
      The Understanding the Dark Web and Its Implications for Policy conference focused on addressing the challenging dilemmas posed by the anonymity created by the “Dark Web” (the unindexed portion of the Internet only accessible ...
    • Re: Reflections and explorations : Essays on politics, public policy, and governance 

      Stephenson, Max O. Jr.; Kirakosyan, Lyusyena (Virginia Tech Institute for Policy and Governance, 2015)
      We have organized the essays that follow in this volume into nine themes or broad topical foci based on the subjects our RE: Reflections and Explorations authors selected for their efforts during 2013-2014. A brief overview ...
    • RE: Reflections and Explorations: A Forum for Deliberative Dialogue 

      Stephenson, Max O. Jr.; Kirakosyan, Lyusyena (Virginia Tech Institute for Policy and Governance in association with VT Publishing, 2017)
      The essays in this volume treat dimensions of broader trends at all scales of analysis, examining the elemental issue of democratic agency and obstacles to its exercise, the difficulties inherent for self-governance in ...
    • Reading Self-Perceived Ability, Enjoyment and Achievement: A Genetically Informative Study of Their Reciprocal Links Over Time 

      Malanchini, Margherita; Wang, Zhe; Voronin, Ivan; Schenker, Victoria J.; Plomin, Robert; Petrill, Stephen A.; Kovas, Yulia (2017-04)
      Extant literature has established a consistent association between aspects of reading motivation, such as enjoyment and self-perceived ability, and reading achievement, in that more motivated readers are generally more ...
    • Ready…Go: Amplitude of the fMRI Signal Encodes Expectation of Cue Arrival Time 

      Cui, Xu; Stetson, Chess; Montague, P. Read; Eagleman, David M. (PLOS, 2009-08-04)
      What happens when the brain awaits a signal of uncertain arrival time, as when a sprinter waits for the starting pistol? And what happens just after the starting pistol fires? Using functional magnetic resonance imaging ...
    • Real-Time Forecast of Hydrologically Sensitive Areas in the Salmon Creek Watershed, New York State, Using an Online Prediction Tool 

      Dahlke, Helen E.; Easton, Zachary M.; Fuka, Daniel R.; Walter, M. Todd; Steenhuis, Tammo S. (MDPI, 2013-07-02)
      In the northeastern United States (U.S.), watersheds and ecosystems are impacted by nonpoint source pollution (NPS) from agricultural activity. Where agricultural fields coincide with runoff-producing areas—so called ...
    • Real-World Use of Automated Driving Systems and their Safety Consequences: A Naturalistic Driving Data Analysis 

      Kim, Hyungil; Song, Miao; Doerzaph, Zachary R. (SAFE-D: Safety Through Disruption National University Transportation Center, 2020-11)
      Automated driving systems (ADS) have the potential to fundamentally change transportation, and a growing number of these systems have entered the market and are currently in use on public roadways. However, drivers may not ...