Patents Assigned to Virginia Polytechnic Institute
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Patent number: 8437969Abstract: A phasor measurement unit and method including a transducer for transduction measurement of an electrical characteristic of a current carrying element in electrical power generation or distribution systems, the transducer generating a transducer output signal representative of the electrical characteristic; an amplifier receiving the transducer output signal and generating an amplifier output signal; a filter receiving the amplifier output signal, low pass filtering the amplifier output signal, and generating a filter output signal; an analog to digital converter receiving the filter output signal and generating a digital output signal; and a processor receiving the digital output signal, calculating phasor data from the digital output signal and generating a data output signal, wherein the calculated phasor data is at least as accurate as phasor data from a phasor measurement unit or a frequency data recorder having a transducer for nontransduction measurement of the same electrical characteristic.Type: GrantFiled: March 15, 2010Date of Patent: May 7, 2013Assignee: Virginia Polytechnic Institute and State UniversityInventors: Guorui Zhang, Yilu Liu, Yingchen Zhang
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Patent number: 8423494Abstract: A system for generating a representation of a situation is disclosed. The system comprises one or more computer-readable media including computer-executable instructions that are executable by one or more processors to implement a method of generating a representation of a situation. The method comprises receiving input data regarding a target population. The method further comprises constructing a synthetic data set including a synthetic population based on the input data. The synthetic population includes a plurality of synthetic entities. Each synthetic entity has a one-to-one correspondence with an entity in the target population. Each synthetic entity is assigned one or more attributes based on information included in the input data. The method further comprises receiving activity data for a plurality of entities in the target population.Type: GrantFiled: April 14, 2010Date of Patent: April 16, 2013Assignee: Virginia Polytechnic Institute and State UniversityInventors: Christopher L. Barrett, Madhav V. Marathe, Keith R. Bisset, Richard J. Beckman, Paula E. Stretz, Henning S. Mortveit, Stephen G. Eubank, Achla Marathe, Anil Kumar S. Vullikanti
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Patent number: 8350771Abstract: A dual-band, dual-orthogonally-polarized antenna element includes a dielectric substrate having a conductor layer that includes a square ring slot and a shorted square ring, with each having a pair of orthogonal feed points. The shorted square ring is fed with coaxial probe feeds, while the square ring slot feeds striplines terminated in open-circuited stubs for coupling energy to each pair of orthogonal feed points. The first and second stripline feeds are not coplanar in order that each stub terminates past a center point of the element. The square ring slot operates as a high frequency band radiator and the shorted square ring operates as a low frequency band radiator, and both bands radiate substantially simultaneous dual-orthogonally-polarized modes. The modes can be any combination of dual-Circular Polarization (CP) and dual-Linear Polarization (LP), depending on the geometry of the radiators.Type: GrantFiled: June 2, 2010Date of Patent: January 8, 2013Assignees: The United States of America, as represented by the Secretary of the Navy, Virginia Polytechnic Institute and State UniversityInventors: Amir I Zaghloul, W Mark Dorsey
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Patent number: 7943159Abstract: A composition for attracting male Synanthedon scitula, containing a male Synanthedon scitula attracting effective amount of Z,Z-3,13-octadecadienyl acetate, optionally E,Z-2,13-octadecadienyl acetate, optionally Z,E-3,13-octadecadienyl acetate, and optionally a carrier material or carrier; the composition containing less than about 0.3% E,Z-3,13-octadecadienyl acetate based on the molar amount of the Z,Z-3,13-octadecadienyl acetate in the composition. A method for attracting male Synanthedon scitula to an object or area, involving treating an object or area with a male Synanthedon scitula attracting composition containing a male Synanthedon scitula attractant effective amount of Z,Z-3,13-octadecadienyl acetate, optionally E,Z-2,13-octadecadienyl acetate, optionally Z,E-3,13-octadecadienyl acetate, and optionally a carrier material or carrier; the composition containing less than about 0.3% E,Z-3,13-octadecadienyl acetate based on the molar amount of the Z,Z-3,13-octadecadienyl acetate in the composition.Type: GrantFiled: December 3, 2008Date of Patent: May 17, 2011Assignees: The United States of America as represented by the Secretary of Agriculture, Virginia Polytechnic Institute and State UniversityInventors: Aijun Zhang, Tracy C. Leskey, Christopher J. Bergh
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Patent number: 7753913Abstract: A device and method for targeting objects and specifically for locating intramedullary screw openings is described. The device and method include a target magnet and a sensor comprising an elliptical array of magnetoresistive elements, designed to give information on the three-dimensional orientation of the magnet. The sensor array is designed such that each magnetoresistive element is a member of an opposing pair and relays information on their alignment with the target magnet. The array is connected to a display such that the position of the sensor in relation to the target magnet is easily discerned. The invention is lightweight and portable, capable of operating on batteries and can be used in primitive situations where a stable supply of electricity is not available.Type: GrantFiled: October 3, 2003Date of Patent: July 13, 2010Assignee: Virginia Polytechnic Institute and State UniversityInventors: David C. Szakelyhidi, Jr., Alex V. Cardinali, Joel D. Stitzel, Alfred A. Durham, Alfred L. Wicks
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Publication number: 20080131353Abstract: Methods for separating and purifying carbon nanomaterials such as trimetallic nitride endohedral metallofullerenes are described. In certain embodiments, carbon nanomaterials are contacted with a carbon nanomaterial reactive agent. The reactive agent binds empty cage fullerenes, nanotubes, and endohedral metallofullerenes without appreciably binding trimetallic nitride endohedral metallofullerenes. According to some embodiments, purified forms of trimetallic nitride endohedral metallofullerenes may be prepared.Type: ApplicationFiled: June 23, 2005Publication date: June 5, 2008Applicant: Virginia Polytechnic Institute and State UniversityInventors: Harry W. Gibson, Harry C. Dorn, Zhongxin Ge, Ting Cai
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Patent number: 7374773Abstract: Pesticidal and/or antimicrobial biological agent-infected hard-bodied arthropod cadavers, such as from the family Tenebrionidae are used to control pest and/or microbial infestations in agriculture, commercial and urban environments.Type: GrantFiled: December 4, 2003Date of Patent: May 20, 2008Assignees: The United States as represented by the Secretary of Agriculture, Virginia Polytechnic Institute and State University, Virginia Tech Intellectual Properties, Inc.Inventors: David I. Shapiro-Ilan, W. Louis Tedders, Edwin E. Lewis
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Publication number: 20070251388Abstract: Thin layers of a mixed composition are deposited on a porous substrate by chemical vapor deposition in an inert atmosphere at high temperature. The resulting membrane has excellent stability to water vapor at high temperatures. An exemplary membrane comprises an amorphous mixed-element surface layer comprising silica and at least one oxide of additional element, an optional porous substrate on which said surface layer is deposited, and a porous support on which said substrate or mixed-element surface layer is deposited, wherein the permeance of the membrane is higher than 1×10?7 mol m?2 s?1 Pa?1 and the selectivity of H2 over CO, CO2, and CH4 is larger than 100, and wherein the H2 permeance of the membrane after exposure to a stream containing 60 mol % water vapor at 673 K for 120 h is at least 50% of its initial H2 permeance.Type: ApplicationFiled: May 1, 2006Publication date: November 1, 2007Applicant: Virginia Polytechnic Institute and State UniversityInventors: S. Oyama, Yunfeng Gu
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Publication number: 20050172811Abstract: A hydrogen permselective membrane, a method of forming a permselective membrane and an apparatus comprising a permselective membrane, a porous substrate and an intermediate layer are described.Type: ApplicationFiled: February 10, 2004Publication date: August 11, 2005Applicants: ConocoPhillips Company, Virginia Polytechnic Institute and State UniversityInventors: Shigeo Oyama, Yunfeng Gu, Doohwan Lee
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Patent number: 6854602Abstract: A hydrogen permselective membrane, a method of forming a permselective membrane and an apparatus comprising a permselective membrane, a porous substrate and an optional intermediate layer are described. Using chemical vapor deposition (CVD) at low reactant gas concentration, high permselectivities are achieved with minimal reduction in hydrogen permeance.Type: GrantFiled: June 4, 2002Date of Patent: February 15, 2005Assignees: Conocophillips Company, Virginia Polytechnic Institute & State UniversityInventors: Shigeo Ted Oyama, Lixiong Zang, Doohwan Lee, Doug S. Jack
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Patent number: 6718281Abstract: Disclosed is a novel apparatus and method for volumetric dilatometry. A volumetric dilatometer includes an optical displacement sensor and a means for using a gap measurement obtained from the displacement sensor application in an application which requires the measurement of absolute distance and/or displacement. A novel signal-processing algorithm for volumetric dilatometry is also disclosed. The signal-processing algorithm includes a step for recovering the phase information from a spectral signal by taking the Fourier transform of a spectral signal and deriving a sensor gap measurement from the phase information. A micro-translation stage is provided for automated positioning of the optical sensor and automated re-leveling in an out-of-range condition. A heat source is consists of a vertical tube furnace, such as those found in drywell technologies.Type: GrantFiled: February 15, 2001Date of Patent: April 6, 2004Assignee: Virginia Polytechnic Institute & State UniversityInventors: Paul G. Duncan, Sean Michael Christian, Kevin Anthony Shinpaugh, Herve Marand
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Publication number: 20030222015Abstract: A hydrogen permselective membrane, a method of forming a permselective membrane and an apparatus comprising a permselective membrane, a porous substrate and an optional intermediate layer are described. Using chemical vapor deposition (CVD) at low reactant gas concentration, high permselectivities are achieved with minimal reduction in hydrogen permeance.Type: ApplicationFiled: June 4, 2002Publication date: December 4, 2003Applicants: Conoco Inc., Virginia Polytechnic Institute and State UniversityInventors: Shigeo Ted Oyama, Lixiong Zang, Doohwan Lee, Doug S. Jack
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Patent number: 6319497Abstract: A novel predator bacterium Burkholderia casidae is disclosed. The invention is directed to the isolation and use of Burkholderia casidae to control microbial diseases of plants. The genetic, biochemical and physiological characteristics of Burkholderia casidae are described. Biocontrol compositions comprising Burkholderia casidae, and antimicrobial compounds and antimicrobial preparations prepared from Burkholderia casidae are also disclosed, as are methods for accomplishing all of the foregoing.Type: GrantFiled: April 22, 1998Date of Patent: November 20, 2001Assignees: Virginia Tech Intellectual Properties, Inc., Virginia Polytechnic Institute and State University, The Penn State Research FoundationInventors: Lester Earl Casida, Jr., Joseph Oliver Falkinham, III, Cody Christopher Cain
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Patent number: 6264952Abstract: Vaccines against facultative intracellular pathogens are disclosed. A host is vaccinated with non-viable but metabolically active agents. The non-viable agents produce immunogenic components that elicit protective host immune responses, with minimal likelihood of host infection by the vaccine agent. Living agents, either attenuated or virulent, are exposed to a dose of gamma irradiation (or other strong mutagen) that is sufficient to limit or prevent the replication of the agents within the host, but that is insufficient to stop the metabolic activities of the agent. In vitro exposure of a microbial agent to the damaging effects of gamma irradiation or of another strong mutagen induces certain stress responses in the infectious agent. These stress responses are similar to the stress responses that the virulent agent would produce within the tissues of the host.Type: GrantFiled: December 11, 1997Date of Patent: July 24, 2001Assignees: Board of Supervisors of Louisiana State University and Agricultural and Mechanical College, Virginia Polytechnic Institute and State University, Board of Regents for Oklahoma State University, Cornell Research Foundation, Inc.Inventors: Frederick M. Enright, Alexander J. Winter, Gerhardt G. Schurig, John H. Wyckoff, III
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Patent number: 6255554Abstract: A non-human transgenic mammalian animal, as described above, contains an exogenous double stranded DNA sequence stably integrated into the genome of the animal, which comprises cis-acting regulatory units operably linked to a DNA sequence encoding human Factor VIII protein and a signal peptide, where the cis-acting regulatory units are active in mammary gland cells and the signal peptide is active in directing newly expressed Factor VIII into the milk of the animal. The promoter may be a milk protein promoter such as for whey acidic protein, casein, lactalbumin, or beta-lactoglobulin promoter. The transgenic mammals are preferably farm animals, for example, cows, goats, sheep, rabbits and pigs. Concurrent expression of a gene for human von Willebrand's Factor into milk may be used to stabilize newly-secreted Factor VIII.Type: GrantFiled: March 4, 1999Date of Patent: July 3, 2001Assignees: American National Red Cross, Virginia Polytechnic Institute & State UniversityInventors: Henryk Lubon, William N. Drohan, William H. Velander
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Patent number: 6090486Abstract: Fiber reinforced thermosetting matrix materials are advantageously created using fibers that are coated with a coating containing a nucleophilic initiator or have a surface treatment which creates a nucleophilic initiator on the surface. The fibers are combined with the thermosetting matrix materials just before curing of the matrix material is desired. These fibers and this methodology avoid premature curing, allow higher levels of initiator to be used to ensure rapid cure, and allow the thermosetting matrix materials to be heated to reduce viscosity.Type: GrantFiled: April 22, 1999Date of Patent: July 18, 2000Assignee: Virginia Polytechnic Institute & State UniversityInventors: Judy S. Riffle, Christy S. Tyberg, James E. McGrath
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Patent number: 5633793Abstract: A boost rectifier is provided with an ultra high speed diode in its direct current rail to reduce diode reverse recovery loss with or without implementing a soft switching technique. Full zero-voltage-transition (ZVT) as well as zero-current-transition (ZCT) may also be achieved by adding a simple auxiliary network across the DC rail which operates only during the short turn-on transients of the bridge switches. Similarly, a simple, inexpensive auxiliary circuit can be added to the DC rail of a conventional voltage source inverter shown to implement both ZVT and ZCT.Type: GrantFiled: January 23, 1995Date of Patent: May 27, 1997Assignees: Center for Innovative Technology, Virginia Tech Intellectual Properties, Inc., Virginia Polytechnic Institute and State UniversityInventors: Fred C. Lee, Yimin Jiang
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Patent number: 5625587Abstract: A ferroelectric memory device having a perovskite thin film of a rare earth manganate and processes for manufacturing the same. The perovskite thin film layer has properties consistent with high quality nonvolatile memory devices. The perovskite thin film layer can be applied by a MOCVD process, by a MOD process, or a liquid source delivery process, all of which are described.Type: GrantFiled: July 12, 1995Date of Patent: April 29, 1997Assignee: Virginia Polytechnic Institute and State UniversityInventors: Chien-Hsiung Peng, Seshu B. Desu, Jie Si
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Patent number: 5580554Abstract: Methods are provided for the diagnosis and treatment of patients with increased risk of gestational hypertension or preeclampsia. The methods involve measuring serum M-CSF levels, and administration of M-CSF.Type: GrantFiled: March 23, 1995Date of Patent: December 3, 1996Assignees: Genetics Institute, Inc., Virginia Polytechnic Institute and State UniversityInventor: James C. Keith
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Patent number: 5574636Abstract: An improved zero voltage transition (ZVT) pulse width modulation (PWM) link converter is provided which introduces a space vector modulation scheme and an auxiliary circuit which includes a commutation power supply or special switch arrangement used to discharge resonant inductor currents to zero and to recover commutation energy. In an alternate embodiment, an improved ZVT PWM link converter provides an auxiliary switch for each main switch in the converter to achieve ZVT. The novel ZVT converters provide zero-voltage switching without increasing switching action of the main switches. In this way, the advantages of PWM control is maintained. Conduction loss, turn-off losses, and voltage stress of the main switches are the same as in conventional PWM converters, but the dominant turn-on losses are eliminated, so total power losses are minimized.Type: GrantFiled: September 9, 1994Date of Patent: November 12, 1996Assignees: Center for Innovative Technology, Virginia Tech Intellectual Properties, Inc., Virginia Polytechnic Institute and State UniversityInventors: Fred C. Lee, Hengchun Mao