Now showing items 21-40 of 1272

    • Predictability Modulates Human Brain Response to Reward 

      Berns, Gregory S.; McClure, Samuel M.; Pagnoni, Guiseppe; Montague, P. Read (Society for Neuroscience, 2001-04-15)
      Certain classes of stimuli, such as food and drugs, are highly effective in activating reward regions. We show in humans that activity in these regions can be modulated by the predictability of the sequenced delivery of ...
    • Use of Mental Health and Substance Abuse Treatment Services Among Adults With HIV in the United States 

      Burnam, M. Audrey; Bing, Eric G.; Morton, Sally C.; Sherbourne, Cathy; Fleishman, John A.; London, Andrew S.; Vitiello, Benedetto; Stein, Michael; Bozzette, Samuel A.; Shapiro, Martin F. (AMA, 2001-08)
      Background: The need for mental health and substance abuse services is great among those with human immunodeficiency virus (HIV), but little information is available on services used by this population or on individual ...
    • Psychiatric Disorders and Drug Use Among Human Immunodeficiency Virus–Infected Adults in the United States 

      Bing, Eric G.; Burnam, M. Audrey; Longshore, Douglas; Fleishman, John A.; Sherbourne, Cathy Donald; London, Andrew S.; Turner, Barbara J.; Eggan, Ferd; Beckman, Robin; Vitiello, Benedetto; Morton, Sally C.; Orlando, Maria; Bozzette, Samuel A.; Ortiz-Barron, Lucila; Shapiro, Martin (AMA, 2001-08)
      Background: There have been no previous nationally representative estimates of the prevalence of mental disorders and drug use among adults receiving care for human immunodeficiency virus (HIV) disease in the United States. ...
    • Managing Shrub-Infested, Postmined Pasturelands With Goats and Cattle. Part II, Effects on Forage Biomass, Nutritive Values, and Animal Performance 

      Abaye, A. O. (Azenegashe Ozzie); Webb, D. M.; Zipper, Carl E., 1948-; Luginbuhl, Jean-Marie; Teutsch, Christopher David, 1968- (Virginia Cooperative Extension, 2001-12-09)
      Reclamation of mined lands in the Appalachian coal region has resulted in the successful establishment and utilization of pasture for beef cattle production. Research goals were to determine the effects of mixed grazing ...
    • Why watershed-based water management makes sense 

      Francisco, H. (Makati City, Philippines: Philippine Institute for Development Studies, 2002)
      The alarming increase in the scarcity of water in various parts of the world has focused global attention on the need for a stronger and more appropriate water resource management solution. With about 166 million people ...
    • Center for Gerontology Newsletter, Fall 2002 

      Unknown author (Virginia Tech, 2002)
      The Center for Gerontology newsletter, published twice annually, provides faculty and project updates, along with recognitions received by faculty and students in the area of age-related research and activities.
    • Older Families in Rural Communities: Personal and Social Influences on Service Use 

      Roberto, Karen A.; Blieszner, Rosemary (U. S. Department of Agriculture, 2002)
      The overall goal of this research project was to gather data from older adults and their family caregivers living in rural southwest Virginia to learn how health and community-based services programs can win greater ...
    • Multimodal Interaction in Music Using the Electromyogram and Relative Position Sensing 

      Tanaka, Atau; Knapp, R. Benjamin (NIME, 2002)
      This paper describes a technique of multimodal, multichannel control of electronic musical devices using two control methodologies, the Electromyogram (EMG) and relative position sensing. Requirements for the application ...
    • Goals and Conditions for a Sustainable World 

      Cairns, John (Ethics in Science and Environmental Politics, 2002)
      This book is a collection of John Cairns, Jr.'s papers, articles, and commentaries focusing primarily on goals and conditions needed to achieve the sustainable use of the planet.
    • Effects of Active Exploration and Passive Observation on Spatial Learning in a CAVE 

      Melanson, Brian; Kelso, John; Bowman, Doug A. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2002-07-01), TR-02-15
      This experiment was a modification of Paul N. Wilson's 1999 study entitled "Active Exploration of a Virtual Environment Does Not Promote Orientation or Memory for Objects." It was hoped that changing the immersion level ...
    • A Survey of Usability Evaluation in Virtual Environments: Classification and Comparison of Methods 

      Bowman, Doug A.; Gabbard, Joseph L.; Hix, Deborah (MIT Press, 2002-08-01)
      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 ...
    • Center for Gerontology Newsletter, Fall 2003 

      Unknown author (Virginia Tech, 2003)
      The Center for Gerontology newsletter, published twice annually, provides faculty and project updates, along with recognitions received by faculty and students in the area of age-related research and activities.
    • Center for Gerontology Newsletter, Spring 2003 

      Unknown author (Virginia Tech, 2003)
      The Center for Gerontology newsletter, published twice annually, provides faculty and project updates, along with recognitions received by faculty and students in the area of age-related research and activities.
    • Politics and water policy: A Southern Africa example 

      Nicol, A.; Mtisi, S. (Brighton, U.K.: Kensington Press, 2003)
      Drawing on fieldwork from the Sustainable Livelihoods in Southern Africa programme - largely undertaken in Zimbabwe, with some additional material from South Africa and Mozambique - this article examines the politics ...
    • Eco-Ethics and Sustainability Ethics 

      Cairns, John (Ethics in Science and Environmental Politics, 2003)
      This book is part one of a collection of John Cairns, Jr's papers and articles highlighting the importance of eco-ethics and sustainability ethics in protecting the biospheric life support system.
    • Communications in Electronic Textile Systems 

      Nakad, Z.; Jones, M.; Martin, T. (2003)
      Electronic textiles (e-textiles) are emerging as a novel method for constructing electronic systems in wearable and large area applications. This new type of processing system merges textile and electronic technologies. ...
    • Immersive Virtual Environments for University Education: Views from the Classroom 

      Bowman, Doug A.; Gracey, Matthew; Lucas, John F.; Setareh, Mehdi; Varadarajan, Srinidhi (Department of Computer Science, Virginia Polytechnic Institute & State University, 2003), TR-03-18
      Education has long been touted as an important application area for immersive virtual environments (VEs). VEs can allow students to visualize and interact with complex three-dimensional (3D) structures, perform virtual ...
    • A Model for a Smallpox-Vaccination Policy 

      Bozzette, Samuel A.; Boer, Rob; Bhatnagar, Vibha; Brower, Jennifer L.; Keeler, Emmett B.; Morton, Sally C.; Stoto, Michael A. (NEJM Group, 2003-01-30)
      Background: The new reality of biologic terrorism and warfare has ignited a debate about whether to reintroduce smallpox vaccination. Methods: We developed scenarios of smallpox attacks and built a stochastic model of ...
    • Efficacy and Safety of Ephedra and Ephedrine for Weight Loss and Athletic Performance: A Meta-analysis 

      Shekelle, Paul G.; Hardy, Mary; Morton, Sally C.; Maglione, Margaret; Mojica, Walter A.; Suttorp, Marika J.; Rhodes, Shannon L.; Jungvig, Lara; Gagné, James (AMA, 2003-03-26)
      CONTEXT: Ephedra and ephedrine sometimes are used for weight loss or enhanced athletic performance, but the efficacy and safety of these compounds are uncertain. OBJECTIVE: To assess the efficacy and safety of ephedra ...