Now showing items 521-540 of 624

    • Safety vs. Autonomy: The Struggles of Adult Children Assisting Parents with Mild Cognitive Impairment 

      Pujari, Kristen; Blieszner, Rosemary; Roberto, Karen A. (Virginia Tech, 2009)
      The purposes of this qualitative analysis were to understand when, why, and how adult children decide to provide more intense support when a parent has mild cognitive impairment (MCI) and to identify gender similarities ...
    • Scattering kernels for the muon diffusion equation 

      Rusjan, E.; Zweifel, P. F. (American Physical Society, 1988-08)
      Diffusion of muonic hydrogen atoms in gaseous hydrogen is studied. Scattering kernels are derived from the kinematics of an inelastic binary collision. The effect of rotations of the hydrogen molecules is treated by defining ...
    • Science of Team Science 

      Foti, Roseanne J. (2012-10-12)
      Psychology researcher Roseanne J. Foti, Ph.D., describes the Knowledge, Skills, and Attitudes of effective teams and proposes collaborating in the creation and evaluation of science teams at the Center for Autism Research.
    • Searching for quantitative biomarkers of ASD using computational approaches and rapid assessment fMRI 

      Kishida, Kenneth (2012-10-12)
      Kenneth Kishida, a research scientist at the Virginia Tech Carilion Research Institute, proposes the use of functional Magnetic Resonance Imaging assays for classifying neural subtypes of children with autism spectrum disorders.
    • Self-assembled NaNbO3-Nb2O5 (ferroelectric-semiconductor) heterostructures grown on LaAlO3 substrates 

      Wang, Zhiguang; Li, Yanxi; Chen, Bo; Viswan, Ravindranath; Li, Jiefang; Viehland, Dwight D. (AIP Publishing, 2012-09-01)
      We deposited NaNbO3 (NNO)-Nb2O5 (NO) self-assembled heterostructures on LaAlO3 (LAO) to form ferroelectric-semiconductor vertically integrated nanostructures. The NNO component formed as nanorods embedded in a NO matrix. ...
    • Self-biased converse magnetoelectric effect 

      Yang, Su-Chul; Cho, Kyung-Hoon; Park, Chee-Sung; Priya, Shashank (AIP Publishing, 2011-11-01)
      In this letter, we investigate the direct magnetoelectric (DME) and converse magnetoelectric (CME) effects in three-phase metal-ceramic laminate composites. Longitudinally poled and transversely magnetized (L-T) laminate ...
    • Semiconductor module arrangement 

      Electrical and Computer Engineering; Center for Power Electronics Systems (CPES); Virginia Tech Intellectual Properties, Inc.; DiMarino, Christina; Boroyevich, Dushan; Burgos, Rolando P.; Johnson, Mark (United States Patent and Trademark Office, 2018-07-24)
      In a switching module structure that includes a low-impedance path to ground, such as a parasitic capacitance of an insulating substrate, a further insulating substrate presenting a parasitic capacitance placed in series ...
    • Shape Sensitivity Analysis in Flow Models Using a Finite-Difference Approach 

      Akhtar, Imran; Borggaard, Jeffrey T.; Hay, Alexander (Hindawi Publishing Corporation, 2010)
      Reduced-order models have a number of practical engineering applications for unsteady flows that require either low-dimensional approximations for analysis and control or repeated simulation over a range of parameter values. ...
    • Should We Trust Science? Perspectives from the History and Philosophy of Science 

      Oreskes, Naomi (Virginia Tech. University Libraries, 2015-09-02)
      The Global Change Center at Virginia Tech welcomed Dr. Naomi Oreskes, Harvard historian and author, for a Distinguished Lecture on September 2, 2015, at 4:00 p.m. at the Lyric Theatre in Blacksburg, VA. Dr. Oreskes is a ...
    • Size dependent ion-exchange of large mixed-metal complexes into Nafion® membranes 

      Naughton, Elise M.; Zhang, Mingqiang; Troya, Diego; Brewer, Karen J.; Moore, Robert B. (The Royal Society of Chemistry, 2015-08-18)
      Perfluorosulfonate ionomers have been shown to demonstrate a profound affinity for large cationic complexes, and the exchange of these ions may be used to provide insight regarding Nafion® morphology by contrasting molecular ...
    • Specific Emitter Identification Using Convolutional Neural Network-Based IQ Imbalance Estimators 

      Wong, Lauren J.; Headley, William Christopher; Michaels, Alan J. (IEEE, 2019)
      Specific Emitter Identification is the association of a received signal to a unique emitter, and is made possible by the naturally occurring and unintentional characteristics an emitter imparts onto each transmission, known ...
    • Spending Behaviors of Older Women Living in an Assisted Living Facility 

      McClung, Mary E. (Virginia Tech, 2002-03-02)
      A major demographic trend in the United States is the increasing older adult population. According to the US Census, the number of persons, ages sixty-five and older has increased approximately 4 million in 2000 and will ...
    • Spiculogenesis and biomineralization in early sponge animals 

      Tang, Qing; Wan, Bin; Yuan, Xunlai; Muscente, A. D.; Xiao, Shuhai (Springer Nature, 2019-07-26)
      Most sponges have biomineralized spicules. Molecular clocks indicate sponge classes diverged in the Cryogenian, but the oldest spicules are Cambrian in age. Therefore, sponges either evolved spiculogenesis long after their ...
    • Status and Perspectives of Multiferroic Magnetoelectric Composite Materials and Applications 

      Palneedi, Haribabu; Annapureddy, Venkateswarlu; Priya, Shashank; Ryu, Jungho (MDPI, 2016-03-09)
      Multiferroic magnetoelectric (ME) composites are attractive materials for various electrically and magnetically cross-coupled devices. Many studies have been conducted on fundamental understanding, fabrication processes, ...
    • Stereovision Combined With Particle Tracking Velocimetry Reveals Advection and Uplift Within a Restraining Bend Simulating the Denali Fault 

      Toeneboehn, Kevin; Cooke, Michele L.; Bemis, Sean P.; Fendick, Anne M. (Frontiers, 2018-10-10)
      Scaled physical experiments allow us to directly observe deformational processes that take place on time and length scales that are impossible to observe in the Earth's crust. Successful evaluation of advection and uplift ...
    • Strong graphene oxide nanocomposites from aqueous hybrid liquid crystals 

      Hegde, Maruti; Yang, Lin; Vita, Francesco; Fox, Ryan J.; van de Watering, Renee; Norder, Ben; Lafont, Ugo; Francescangeli, Oriano; Madsen, Louis A.; Picken, Stephen J.; Samulski, Edward T.; Dingemans, Theo J. (2020-02-11)
      Combining polymers with small amounts of stiff carbon-based nanofillers such as graphene or graphene oxide is expected to yield low-density nanocomposites with exceptional mechanical properties. However, such nanocomposites ...
    • Structural Resemblance Between Droop Controllers and Phase-Locked Loops 

      Zhong, Qing-Chang; Boroyevich, Dushan (IEEE, 2016)
      It is well known that droop control is fundamental to the operation of power systems and now the parallel operation of inverters, while phase-locked loops (PLLs) are widely adopted in modern electrical engineering. In this ...
    • Structure-performance relationships for cantilever-type piezoelectric energy harvesters 

      Cho, Kyung-Hoon; Park, Hwi-Yeol; Heo, Jin S.; Priya, Shashank (American Institute of Physics, 2014-05-28)
      This study provides comprehensive analysis of the structure-performance relationships in cantilever-type piezoelectric energy harvesters. It provides full understanding of the effect of all the practical global control ...
    • A Study of Increased Use of Renewable Energy Resources in Virginia 

      Karmis, Michael (Virginia Tech. Virginia Center for Coal and Energy Research., 2005-11-11)
      The objective of this study, as requested by the Virginia Commission on Electric Utility Restructuring, was to review the current status and prospects for renewable energy in Virginia. The study reviews the current generation ...
    • Superjunction Power Transistors With Interface Charges: A Case Study for GaN 

      Ma, Yunwei; Xiao, Ming; Zhang, Ruizhe; Wang, Han; Zhang, Yuhao (2019-12-13)
      Recent progress in p-GaN trench-filling epitaxy has shown promise for the demonstration of GaN superjunction (SJ) devices. However, the presence of n-type interface charges at the regrowth interfaces has been widely observed. ...