Now showing items 371-390 of 490

    • 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: 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 ...
    • 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, ...
    • 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 ...
    • Phosphonium-containing diblock copolymers from living anionic polymerization of 4-diphenylphosphino styrene 

      Schultz, Alison R.; Fahs, Gregory B.; Jangu, Chainika; Chen, Mingtao; Moore, Robert B.; Long, Timothy E. (The Royal Society of Chemistry, 2015-11-20)
      Living anionic polymerization of 4-diphenylphosphino styrene (DPPS) achieved well-defined homopolymers, poly(DPPS-b-S) styrenic block copolymers, and poly(I-b-DPPS) diene-based diblock copolymers with predictable molecular ...
    • Physical layer orthogonal frequency-division multiplexing acquisition and timing synchronization security 

      La Pan, Matthew J.; Clancy, Charles T.; McGwier, Robert W. (Wiley, 2014-08-18)
      Orthogonal frequency-division multiplexing (OFDM) has become the manifest modulation choice for 4G standards. Timing acquisition and carrier frequency offset synchronization are prerequisite to OFDM demodulation and must ...
    • Piecewise-Constant-Model-Based Interior Tomography Applied to Dentin Tubules 

      He, Peng; Wei, Biao; Wang, Steve; Stock, Stuart R.; Yu, Hengyong; Wang, Ge (Hindawi Publishing Corporation, 2013)
      Dentin is a hierarchically structured biomineralized composite material, and dentin's tubules are difficult to study in situ. Nano-CT provides the requisite resolution, but the field of view typically contains only a few ...
    • Piezoelectric and Magnetoelectric Thick Films for Fabricating Power Sources in Wireless Sensor Nodes 

      Priya, Shashank; Ryu, Jungho; Park, Chee-Sung; Oliver, Josiah; Choi, Jong-Jin; Park, Dong-Soo (MDPI, 2009-08-17)
      In this manuscript, we review the progress made in the synthesis of thick film-based piezoelectric and magnetoelectric structures for harvesting energy from mechanical vibrations and magnetic field. Piezoelectric compositions ...
    • Piezoelectric MEMS for energy harvesting 

      Kim, S. G.; Priya, S.; Kanno, I. (Cambridge University Press, 2012-11)
      Piezoelectric microelectromechanical systems (MEMS) have been proven to be an attractive technology for harvesting small magnitudes of energy from ambient vibrations. This technology promises to eliminate the need for ...
    • Piezoelectric properties and temperature stability of Mn-doped Pb(Mg1/3Nb2/3)-PbZrO3-PbTiO3 textured ceramics 

      Yan, Yongke; Cho, Kyung-Hoon; Priya, Shashank (AIP Publishing, 2012-03-01)
      In this letter, we report the electromechanical properties of textured 0.4Pb(Mg1/3Nb2/3) O-3-0.25PbZrO(3)-0.35PbTiO(3) (PMN-PZT) composition which has relatively high rhombohedral to tetragonal (R-T) transition temperature ...
    • Pond at the Gottlieb residence 

      Gottlieb, Mark (Virginia Tech. Digital Library and Archives; Virginia Tech. University Libraries. Special Collections Department, 2008-04-11)
      Mark Gottlieb, son of Lois Gottlieb, sent photos of a house designed by his mother. This home is in Fairfax Station, Virginia.
    • Power switch drivers with equalizers for paralleled switches 

      Virginia Tech Intellectual Properties, Inc.; Miao, Zichen; Ngo, Khai D.; Zhang, Lujie (United States Patent and Trademark Office, 2018-06-12)
      Capacitors connected between gate terminals of a plurality of parallel-connected power transistors are charged and discharged in each switching cycle to provide a plurality of power transistor control waveforms from a ...
    • Power-cell switching-cycle capacitor voltage control for modular multi-level converters 

      Virginia Tech Intellectual Properties, Inc.; Wang, Jun; Boroyevich, Dushan; Burgos, Rolando P.; Wen, Bo (United States Patent and Trademark Office, 2018-05-08)
      In a modular multi-level power converter, additional switching states are interleaved between main switching states that control output voltage or waveform. The additional switching states provide current from a DC-link ...
    • Predicting Mild Traumatic Brain Injury with Injury Risk Functions 

      Young, Tyler (Brain Injuries and Biomechanics Symposium, 2013-09-19)
      To assess the safety of various products, equipment, and vehicles during traumatic events injury risk curves have been developed correlate measurable parameters with risk of injury. The first risk curves to predict head ...