Now showing items 1-20 of 775

    • From Landscapes to Waterscapes: A PSE for Landuse Change Analysis 

      Rubin, E.J.; Diet, R.; Chanat, J.; Speir, C.; Dymond, Randel L.; Lohani, Vinod K.; Kibler, D.; Bosch, D. D.; Shaffer, Clifford A.; Ramakrishnan, Naren; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2000), TR-00-09
      We describe the design and implementation of L2W — a problem solving environment (PSE) for landuse change analysis. L2W organizes and unifies the diverse collection of software typically associated with ecosystem models ...
    • Choosing a Sustainable Future: SANREM CRSP 1999 Annual Report 

      Cason, K. (ed.) (Watkinsville, Ga.: SANREM CRSP, 2000)
      This document describes the progress of the SANREM CRSP for the period June 1, 1999 to May 31, 2000.
    • Dendritic Spikes and Their Influence on Extracellular Calcium Signaling 

      Wiest, Michael C.; Eagleman, David M.; King, Richard D.; Montague, P. Read (American Physiological Society, 2000)
      Extracellular calcium is critical for many neural functions, including neurotransmission, cell adhesion, and neural plasticity. Experiments have shown that normal neural activity is associated with changes in extracellular ...
    • Delayed Medical Care After Diagnosis in a US National Probability Sample of Persons Infected With Human Immunodeficiency Virus 

      Turner, Barbara J.; Cunningham, William E.; Duan, Naihua; Andersen, Ronald M.; Shapiro, Martin F.; Bozzette, Samuel A.; Nakazono, Terry; Morton, Sally C.; Crystal, Steven; St. Clair, Patti; Stein, Michael; Zierler, Sally (AMA, 2000-09-25)
      Objective: To identify health care and patient factors associated with delayed initial medical care for human immunodeficiency virus (HIV) infection. Design: Survey of a national probability sample of persons with HIV ...
    • Sustainable Use of Land and Resources: SANREM CRSP 2000 Annual Report 

      Cason, K. (ed.) (Watkinsville, Ga.: SANREM CRSP, 2001)
      This document describes the progress of the SANREM CRSP for the period June 1, 2000 through May 31, 2001.
    • Saving a river: Why do local governments matter? 

      Rola, Agnes C.; Tabien, C. (College, Laguna, Philippines: University of the Philippines Los Baños. School of Environmental Science and Management, 2001)
      This paper evaluates the sufficiency and local implementation of river management laws in the Philippines. The assessment is that although there are enough policies and regulations, they are not adequately implemented at ...
    • 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 ...
    • Expenditures for the Care of HIV-Infected Patients in the Era of Highly Active Antiretroviral Therapy 

      Bozzette, Samuel A.; Joyce, Geoffrey; McCaffrey, Daniel F.; Leibowitz, Arleen A.; Morton, Sally C.; Berry, Sandra H.; Rastegar, Afshin; Timberlake, David; Shapiro, Martin F.; Goldman, Dana P. (NEJM Group, 2001-03-15)
      Background: The introduction of expensive but very effective antiviral medications has led to questions about the effects on the total use of resources for the care of patients with human immunodeficiency virus (HIV) ...
    • LTD Induction in Adult Visual Cortex: Role of Stimulus Timing and Inhibition 

      Perrett, Stephen P.; Dudek, Serena M.; Eagleman, David; Montague, P. Read; Friedlander, Michael J. (Society for Neuroscience, 2001-04-01)
      One Hertz stimulation of afferents for 15 min with constant interstimulus intervals (regular stimulation) can induce longterm depression (LTD) of synaptic strength in the neocortex. However, it is unknown whether natural ...
    • 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 ...
    • 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.
    • 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 ...
    • 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 ...
    • 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.
    • 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 ...
    • 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 ...