Now showing items 495-514 of 518

    • Ultra-high frequency photoconductivity decay in GaAs/Ge/GaAs double heterostructure grown by molecular beam epitaxy 

      Hudait, Mantu K.; Zhu, Y.; Johnston, S. W.; Maurya, Deepam; Priya, Shashank; Umbel, R. (AIP Publishing, 2013-03-01)
      GaAs/Ge/GaAs double heterostructures (DHs) were grown in-situ using two separate molecular beam epitaxy chambers. High-resolution x-ray rocking curve demonstrates a high-quality GaAs/Ge/GaAs heterostructure by observing ...
    • Uniform component of index structure induced in Ge-SiO2 fibers by spatially modulated ultraviolet light 

      Tsai, T. E.; Williams, G. M.; Friebele, E. J. (AIP Publishing, 1998-06-01)
      Experimental data are presented to show that Ge(1) and Ge(2) centers are induced by trapping photoinduced electrons from the conduction band, in agreement with our previous proposal that both are trapped electron centers. ...
    • Universal system structure for low power adapters 

      Electrical and Computer Engineering; Center for Power Electronics Systems (CPES); Virginia Tech Intellectual Properties, Inc.; Li, Qiang; Lee, Fred C.; Huang, Xiucheng (United States Patent and Trademark Office, 2017-12-19)
      A two-stage power converter architecture including an isolation transformer and rectification of the isolation transformer output by an LLC resonant circuit and methodology for operating the same feeds an output voltage ...
    • Unsupervised Deconvolution of Dynamic Imaging Reveals Intratumor Vascular Heterogeneity and Repopulation Dynamics 

      Chen, Li; Choyke, Peter L.; Wang, Niya; Clarke, Robert; Bhujwalla, Zaver M.; Hillman, Elizabeth M. C.; Wang, Ge; Wang, Yue (PLOS, 2014-11-07)
      With the existence of biologically distinctive malignant cells originated within the same tumor, intratumor functional heterogeneity is present in many cancers and is often manifested by the intermingled vascular compartments ...
    • Using Heterogeneous Satellites for Passive Detection of Moving Aerial Target 

      Liu, Mingqian; Li, Kunming; Song, Hao; Chen, Yunfei; Gao, Xiuhui; Gong, Fengkui (MDPI, 2020-04-03)
      Passive detection of a moving aerial target is critical for intelligent surveillance. Its implementation can use signals transmitted from satellites. Nowadays, various types of satellites co-exist which can be used for ...
    • Using power fingerprinting (PFP) to monitor the integrity and enhance security of computer based systems 

      Electrical and Computer Engineering; Virginia Tech Intellectual Properties, Inc.; Reed, Jeffrey H.; Aguayo Gonzalez, Carlos R. (United States Patent and Trademark Office, 2016-02-16)
      Procedures are described for enhancing target system execution integrity determined by power fingerprinting (PFP): by integrating PFP into the detection phase of comprehensive defense-in-depth security; by deploying a ...
    • Using power fingerprinting (PFP) to monitor the integrity and enhance security of computer based systems 

      Electrical and Computer Engineering; Virginia Tech Intellectual Properties, Inc.; Reed, Jeffrey H.; Aguayo Gonzalez, Carlos R. (United States Patent and Trademark Office, 2017-01-31)
      Procedures are described for enhancing target system execution integrity determined by power fingerprinting (PFP): by integrating PFP into the detection phase of comprehensive defense-in-depth security; by deploying a ...
    • Using power fingerprinting (PFP) to monitor the integrity and enhance security of computer based systems 

      Electrical and Computer Engineering; Virginia Tech Intellectual Properties, Inc.; Reed, Jeffrey H.; Aguayo Gonzalez, Carlos R. (United States Patent and Trademark Office, 2017-01-31)
      Procedures are described for enhancing target system execution integrity determined by power fingerprinting (PFP): by integrating PFP into the detection phase of comprehensive defense-in-depth security; by deploying a ...
    • V^2 power converter control with capacitor current ramp compensation 

      Electrical and Computer Engineering; Center for Power Electronics Systems (CPES); Virginia Tech Intellectual Properties, Inc.; Liu, Pei-Hsin; Lee, Fred C.; Yan, Yingyi (United States Patent and Trademark Office, 2017-03-21)
      Operation of a switching power converter having an output capacitor having a small equivalent series resistance (ESR) is stabilized and jitter reduced by sensing capacitor current with gain and combining the resulting ...
    • Virtual Secure Circuit: Porting Dual-Rail Pre-charge Technique into Software on Multicore 

      Chen, Zhimin; Schaumont, Patrick Robert (Cryptology ePrint Archive, 2010)
      This paper discusses a novel direction for multicore cryptographic software, namely the use of multicore to protect a design against side-channel attacks.We present a technique which is based on the principle of dual-rail ...
    • Visibility-Dependent Depth Of Focus For Incoherent Sinusoidal Sources 

      Pieper, Ronald J.; Raj, Kannan; Poon, Ting-Chung (Optical Society of America, 1992-05-01)
      A visibility-dependent depth of focus is developed for incoherent sinusoidal sources. This analysis is based on a derived relationship between the visibility and the optical transfer function (OTF). The formalism developed ...
    • Void-mediated coherency-strain relaxation and impediment of cubic-to-hexagonal transformation in epitaxial metastable metal/semiconductor TiN/Al0.72Sc0.28N multilayers 

      Garbrecht, Magnus; Hultman, Lars; Fawey, Mohammed H.; Sands, Timothy D.; Saha, Bivas (2017-08-17)
      Bulk metastable phases can be stabilized during thin-film growth by employing substrates with similar crystal structure and lattice parameter, albeit over a thickness range limited by coherency-strain relaxation. Expanding ...
    • Volatile resistive switching in Cu/TaOx/delta-Cu/Pt devices 

      Liu, T.; Verma, M.; Kang, Y. H.; Orlowski, M. (AIP Publishing, 2012-08-01)
      A volatile switching of conductive filament (CF) in a Cu/TaOx/delta-Cu/Pt device has been observed. The device differs from a conventional Cu/TaOx/Pt device by the insertion of a thin Cu-layer (delta-Cu) between the ...
    • Wavelet Based ULF Pulsation Index for Studying Conjugate ULF Pulsation at High Latitudes and Its Applications to Space Weather 

      Xu, Zhonghua; Kim, H.; Clauer, C. R.; Weimer, Daniel R.; Deshpande, K. (2016-12-14)
    • Wearable Accelerometer and sEMG-Based Upper Limb BSN for Tele-Rehabilitation 

      Baraka, Ahmed; Shaban, Heba; Abou El-Nasr, Mohamad; Attallah, Omneya (MDPI, 2019-07-12)
      Assessment of human locomotion using wearable sensors is an efficient way of getting useful information about human health status, and determining human locomotion abnormalities. Wearable sensors do not only provide the ...
    • Whole Exome Sequencing to Identify Genetic Variants Associated with Raised Atherosclerotic Lesions in Young Persons 

      Hixson, James E.; Jun, Goo; Shimmin, Lawrence C.; Wang, Yizhi; Yu, Guoqiang; Mao, Chunhong; Warren, Andrew S.; Howard, Timothy D.; Vander Heide, Richard S.; Van Eyk, Jennifer; Wang, Yue; Herrington, David M. (Springer Nature, 2017-06-22)
      We investigated the influence of genetic variants on atherosclerosis using whole exome sequencing in cases and controls from the autopsy study "Pathobiological Determinants of Atherosclerosis in Youth (PDAY)". We identified ...
    • Wide scanning spherical antenna 

      Electrical and Computer Engineering; Center for Innovative Technology; Virginia Polytechnic Institute and State University; Virginia Tech Intellectual Properties, Inc.; Shen, Bing W.; Stutzman, Warren L. (United States Patent and Trademark Office, 1995-10-17)
      A novel method for calculating the surface shapes for subreflectors in a suboptic assembly of a tri-reflector spherical antenna system is introduced, modeled from a generalization of Galindo-Israel's method of solving ...
    • Winds and tides in the mid-latitude Southern Hemisphere upper mesosphere recorded with the Falkland Islands SuperDARN radar 

      Hibbins, R. E.; Freeman, M. P.; Milan, S. E.; Ruohoniemi, J. Michael (Copernicus Publications, 2011)
      Meteor wind data from the first year of operation of the Falkland Islands SuperDARN radar (52 degrees S, 59 degrees W) are used to characterize the atmospheric tides and background winds in the upper mesosphere above the ...
    • Wireless communication device using time-variant antenna module 

      Electrical and Computer Engineering; Virginia Tech Intellectual Properties, Inc.; Intel Corporation; Suh, Seong-Youp; Kesling, W. Dawson; Manteghi, Majid; Salehi, Mohsen Amini; Skinner, Harry G. (United States Patent and Trademark Office, 2017-07-11)
      Embodiments of the present disclosure describe methods, apparatuses, and systems related to a wireless communication device using time-variant antenna. Other embodiments may be described and/or claimed.
    • Wireless communication device using time-variant antenna module 

      Electrical and Computer Engineering; Virginia Tech Intellectual Properties, Inc.; Intel Corporation; Suh, Seong-Youp; Kesling, W. Dawson; Manteghi, Majid; Salehi, Mohsen Amini; Skinner, Harry G. (United States Patent and Trademark Office, 2016-05-24)
      Embodiments of the present disclosure describe methods, apparatuses, and systems related to a wireless communication device using time-variant antenna. Other embodiments may be described and/or claimed.