Now showing items 418-437 of 571

    • Office desk 

      Gottlieb, Lois Davidson (Virginia Tech. Digital Library and Archives; Virginia Tech. University Libraries. Special Collections Department, 2005-01-06)
    • Oil-Impregnated Hydrocarbon-Based Polymer Films 

      Mukherjee, Ranit; Habibi, Mohammad; Rashed, Ziad T.; Berbert, Otacilio; Shi, Xiangke; Boreyko, Jonathan B. (Springer Nature, 2018-08-03)
      Porous surfaces impregnated with a liquid lubricant exhibit minimal contact angle hysteresis with immiscible test liquids, rendering them ideal as self-cleaning materials. Rather than roughening a solid substrate, an ...
    • 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 ...
    • Olefin cross-metathesis, a mild, modular approach to functionalized cellulose esters 

      Meng, Xiangtao; Matson, John B.; Edgar, Kevin J. (The Royal Society of Chemistry, 2014-09-02)
      Olefin cross-metathesis has been demonstrated to be a modular pathway for synthesis of a series of functionalized cellulose esters. As a proof of concept, cellulose acetate was acylated with two terminally olefinic acid ...
    • On efficient solutions to the continuous sensitivity equation using automatic differentiation 

      Borggaard, Jeffrey T.; Verma, A. (Siam Publications, 2000-06)
      Shape sensitivity analysis is a tool that provides quantitative information about the influence of shape parameter changes on the solution of a partial differential equation (PDE). These shape sensitivities are described ...
    • On the Lawrence-Doniach and Anisotropic Ginzburg-Landau models for layered superconductors 

      Chapman, S. J.; Du, Q.; Gunzburger, M. D. (Siam Publications, 1995-02)
      The authors consider two models, the Lawrence-Doniach and the anisotropic Ginzburg-Landau models for layered superconductors such as the recently discovered high-temperature superconductors. A mathematical description of ...
    • Optimal trajectory control for LLC resonant converter for LED PWM dimming 

      Virginia Polytechnic Institute and State University; Lee, Fred C.; Ji, Shu; Feng, Weiyi (United States Patent and Trademark Office, 2016-03-01)
      Pulse width modulation is provided for controlling a resonant power converter, particularly for dimming of light emitting diode arrays without loss of efficiency. Dynamic oscillation due to the beginning of a pulse width ...
    • Optimal trajectory control for LLC resonant converter for soft start-up 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Feng, Weiyi (United States Patent and Trademark Office, 2016-04-19)
      By setting switching instants of a switching circuit of a resonant power converter based on current in a resonant circuit reaching a current limit of a current limitation band, soft start-up of the power converter can be ...
    • Optimization of segmented thermoelectric generator using Taguchi and ANOVA techniques 

      Kishore, Ravi Anant; Sanghadasa, Mohan; Priya, Shashank (Springer Nature, 2017-12-01)
      Recent studies have demonstrated that segmented thermoelectric generators (TEGs) can operate over large thermal gradient and thus provide better performance (reported efficiency up to 11%) as compared to traditional TEGs, ...
    • Origin of high piezoelectric response in A-site disordered morphotropic phase boundary composition of lead-free piezoelectric 0.93(Na0.5Bi0.5)TiO3-0.07BaTiO(3) 

      Maurya, Deepam; Murayama, M.; Pramanick, A.; Reynolds, W. T., Jr.; An, Ke; Priya, Shashank (American Institute of Physics, 2013-03-21)
      Perovskite piezoelectric compositions near the morphotropic phase boundary (MPB) are known to exhibit high piezoelectric response. In lead-based ABO(3) compound with B-site disorder, the origin of this enhancement has been ...
    • Outdoor grill and patio 

      Gottlieb, Lois Davidson (Virginia Tech. Digital Library and Archives; Virginia Tech. University Libraries. Special Collections Department, 2005-01-06)
    • Outdoor grill, patio, and wooded area 

      Gottlieb, Lois Davidson (Virginia Tech. Digital Library and Archives; Virginia Tech. University Libraries. Special Collections Department, 2005-01-06)
    • Overview: Intimate Partner Violence & Rural Older Women 

      Center for Gerontology (Virginia Tech. Center for Gerontology, 2010)
      Intimate partner violence (IPV) is defined as physical, sexual, or psychological abuse by a spouse, boyfriend, or intimate partner. It is a hidden public health problem, touching nearly one third of all women aged 50+ each ...
    • Overview: Risk of Falling and Older Adults 

      Center for Gerontology (Virginia Tech. Center for Gerontology, 2013-10)
      Falls are a major public health concern for older adults. Annually, 1 out of 3 Americans aged 65+ experiences a fall. According to the Centers for Disease Control and Prevention, falls are the leading cause of hospitalization ...
    • 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 ...
    • Patient Views of Mild Cognitive Impairment 

      Blieszner, Rosemary; Roberto, Karen A. (Center for Gerontology, Virginia Tech, 2007-11)
    • Peptide-based hydrogen sulphide-releasing gels 

      Carter, Jennifer M.; Qian, Yun; Foster, Jeffrey C.; Matson, John B. (The Royal Society of Chemistry, 2015-07-20)
      An aromatic peptide amphiphile was designed for delivery of the signaling gas H2S. The peptide self-assembled in water into nanofibers that gelled upon charge screening. The non-toxic gel slowly released H2S over 15 hours, ...
    • Personal and Social Resources and Well Being among Informal Care Recipients 

      Blieszner, Rosemary; Roberto, Karen A. (Virginia Tech, 2004-07-31)
      Moving beyond a focus on primary caregivers only, we examined the effects on older adults’ psychological well-being of having multiple family or friend helpers and of other elements of social support when receiving informal ...
    • Phase transition and temperature stability of piezoelectric properties in Mn-modified Pb(Mg1/3Nb2/3)O-3-PbZrO3-PbTiO3 ceramics 

      Yan, Yongke; Kumar, Amit; Correa, Margarita; Cho, Kyung-Hoon; Katiyar, R. S.; Priya, Shashank (AIP Publishing, 2012-04-01)
      This study investigates the effect of two different Mn modifiers [MnO2 and Pb(Mn1/3Nb2/3)O-3(PMnN)] on the of phase transitions in Pb(Mg1/3Nb2/3)O-3-PbZrO3-PbTiO3 ceramics. The temperature dependence of polarization derived ...