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Now showing items 130-149 of 619

    • DC-side leakage current reduction for single phase full-bridge power converter/inverter 

      Virginia Tech Intellectual Properties, Inc.; Mattavelli, Paolo; Boroyevich, Dushan; Luo, Fang; Dong, Dong (United States Patent and Trademark Office, 2015-06-02)
      Leakage current through stray or parasitic capacitance (which is particularly large in devices such as photovoltaic cell arrays and which are damaged by such leakage currents) due to common mode switching noise in a full ...
    • Decision selection and associated learning for computing all solutions in automatic test pattern generation (ATPG) and satisfiability 

      Virginia Tech Intellectual Properties, Inc.; Hsiao, Michael S.; Chandrasekar, Kameshwar (United States Patent and Trademark Office, 2008-04-08)
      An all solutions automatic test pattern generation (ATPG) engine method uses a decision selection heuristic that makes use of the “connectivity of gates” in the circuit in order to obtain a compact solution-set. The “symmetry ...
    • Defect detection system for lumber 

      Virginia Polytechnic & State University; The United States of America as represented by the Secretary of the Air; Conners, Richard W.; Kline, David E.; Araman, Phillip A.; Xiao, Xiang-Yu; Drayer, Thomas Hudson (United States Patent and Trademark Office, 1999-09-28)
      A machine vision system that can address a number of board, lineal, cant, and flitch inspection problems by incorporating all the sensors needed to address the surface feature detection problem, the three-dimensional shape ...
    • Detecting software attacks by monitoring electric power consumption patterns 

      The United States of America as represented by the Secretary of Agriculture; Virginia Tech Intellectual Properties, Inc.; Jacoby, Grant A.; Davis, IV, Nathaniel J; Marchany, Randolph C. (United States Patent and Trademark Office, 2011-01-25)
      Software attacks such as worms and viruses are detected in an electronic device by monitoring power consumption patterns. In a first embodiment, software attacks are detected by an increase in power consumption. The increased ...
    • Detection of stealthy malware activities with traffic causality and scalable triggering relation discovery 

      Virginia Tech Intellectual Properties, Inc.; Zhang, Hao; Yao, Danfeng (United States Patent and Trademark Office, 2018-02-06)
      A computer system for distinguishing user-initiated network traffic from malware-initiated network traffic comprising at least one central processing unit (CPU) and a memory communicatively coupled to the CPU. The memory ...
    • Detection, isolation and purification of Clostridium difficile toxin A with toxin receptors 

      Virginia Tech Intellectual Properties, Inc.; Wilkins, Tracy D.; Tucker, Kenneth D. (United States Patent and Trademark Office, 1992-03-24)
      A method is provided for detecting the presence of C. difficile toxin A. Stool or other appropriate specimen is contacted with a reagent containing the human X, Y or I-antigens, each of which is a specific receptor for ...
    • Development of a live, attenuated, recombinant vaccine for Brucellosis 

      Virginia Tech Intellectual Properties, Inc.; Boyle, Stephen M.; Schurig, Gerhardt G.; Sriranganathan, Nammalwar; Bandara, Aloka B. (United States Patent and Trademark Office, 2008-04-29)
      A recombinant, attenuated strain of Brucella suis or Brucella melitensis with a deficiency in carboxyl-terminal protease activity or tail-specific protease activity can be used as a vaccine for the prevention or treatment ...
    • Device and method for tuning an SPR device 

      Virginia Tech Intellectual Properties, Inc.; Meehan, Kathleen; Dessy, Raymond E. (United States Patent and Trademark Office, 2007-03-20)
      The invention related to devices and methods wherein the conditions, under which surface plasmon resonance is established, are modified by altering the balance between orientations of the spins of charge carriers in an SPR ...
    • Devices and methods for contactless dielectrophoresis for cell or particle manipulation 

      Virginia Tech Intellectual Properties, Inc.; Caldwell, John L.; Davalos, Rafael V.; Sano, Michael B.; Shafiee, Hadi (United States Patent and Trademark Office, 2015-03-03)
      Devices and methods for performing dielectrophoresis are described. The devices contain sample channel which is separated by physical barriers from electrode channels which receive electrodes. The devices and methods may ...
    • Devices and methods for contactless dielectrophoresis for cell or particle manipulation 

      Virginia Tech Intellectual Properties, Inc.; Davalos, Rafael V.; Shafiee, Hadi; Sano, Michael B.; Caldwell, John L. (United States Patent and Trademark Office, 2018-09-18)
      Devices and methods for performing dielectrophoresis are described. The devices contain sample channel which is separated by physical barriers from electrode channels which receive electrodes. The devices and methods may ...
    • Dibenzo crown monomers and polymers formed therefrom 

      Virginia Tech Intellectual Properties, Inc.; Gibson, Harry W.; Delaviz, Yadollah (United States Patent and Trademark Office, 1994-04-12)
      Novel bis(extraannular functionally-substituted phenylene) crown compounds, useful as chelating agents or in the synthesis of condensation polymers containing large semi-rigid macrocycles in the polymer backbone, are ...
    • Digital hybrid Vcontrol for buck converters 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Mattavelli, Paolo; Cheng, Kuang-Yao; Yu, Feng Hao (United States Patent and Trademark Office, 2013-11-05)
      Stabilization of a switching voltage regulator employing Vcontrol against ripple oscillation instability when the equivalent series resistance (ESR) of an output capacitor is small is provided by providing both an external ...
    • Digital power supply control 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Li, Jian H.; Xu, Ming Gang; Qiu, Yang (United States Patent and Trademark Office, 2010-04-27)
      A switched voltage regulator provides improved regulation at a lower clock rate/sampling frequency (e.g. several orders of magnitude lower than would be required for comparable regulation) while using a low resolution ...
    • Diode array velocimeter 

      Virginia Tech Intellectual Properties, Inc.; Devenport, William J. (United States Patent and Trademark Office, 1996-05-14)
      A velocimeter includes a light source for emitting a light beam through a flow, the flow including particles for scattering light as the light beam passes through the flow, a focussing device for focussing the scattered ...
    • Diode-assisted gate turn-off thyristor 

      Virginia Tech Intellectual Properties, Inc.; Li, Yuxin; Huang, Alex Q.; Motto, Kevin (United States Patent and Trademark Office, 2002-07-30)
      A gate-controlled switch includes a gate turn-off thyristor in series with a diode. By using the diode in series with the GTO, the switch significantly increases the turn-off voltage that can be used for the current ...
    • Discharge lamp driving circuit having resonant circuit defining two resonance modes 

      Virginia Tech Intellectual Properties, Inc.; Matsushita Electric Works, Ltd.; Lee, Fred C.; Yamauchi, Tokushi; Qian, Jinrong (United States Patent and Trademark Office, 1999-06-22)
      An improved discharge lamp driving circuit of a charge-pump type capable of suppressing a ripple in an envelop of a lamp current at the time of dimming the lamp or at a low environmental temperature. The circuit includes ...
    • Discharge lamp lighting control device 

      Virginia Tech Intellectual Properties, Inc.; Matsushita Electric Works, Ltd.; Lee, Fred C.; Eriguchi, Hiroyasu; Okawa, Masanao; Zhou, Jinghai; Jiang, Yan; Tran, Dung A. (United States Patent and Trademark Office, 2008-06-24)
      A discharge lamp lighting control device (100) having a DC power converter, a power factor improving power converter (1), a polarity reversing circuit (2), a starter circuit (3), and a controller (4). The power factor ...
    • Doppler rotational velocity sensor 

      Virginia Tech Intellectual Properties, Inc.; Holton, Carvel E. (United States Patent and Trademark Office, 2003-09-16)
      The disclosed invention concept utilizes a homodyne/heterodyne interferometer technique in a modified lidar in such a manner as to sense the rotational velocity magnitude and sense of a rotating (or “spinning”) object. ...
    • Doppler sensor for the derivation of torsional slip, friction and related parameters 

      Virginia Tech Intellectual Properties, Inc.; Ahmadian, Mehdi; Holton, Carvel E. (United States Patent and Trademark Office, 2010-04-27)
      An optical method and apparatus are described for the measurement of properties of a travel vehicle or a travel surface upon which the travel vehicle travels, which includes providing an incident light from a light source ...
    • Doppler sensor for the derivation of torsional slip, friction and related parameters 

      Virginia Tech Intellectual Properties, Inc.; Ahmadian, Mehdi; Holton, Carvel E. (United States Patent and Trademark Office, 2012-10-23)
      An optical method and apparatus are described for the measurement of properties of a travel vehicle or a travel surface upon which the travel vehicle travels, which includes providing an incident light from a light source ...