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Georgia Tech Patents

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Now showing 1 - 10 of 1761
  • Item
    Micro-electromechanical Resonators Having Electrically-trimmed Resonator Bodies Therein And Methods Of Fabricating Same Using Joule Heating
    ( 11/22/2011) Georgia Institute of Technology ; Ayazi, Farrokh ; Samarao, Ashwin
    A micro-electromechanical resonator includes an electrically-trimmed resonator body having at least one stiffness-enhanced semiconductor region therein containing metal-semiconductor lattice bonds. These metal-semiconductor lattice bonds may be gold-silicon lattice bonds and/or aluminum-silicon lattice bonds. A surface of the resonator body is mass-loaded with the metal, which may be provided by a plurality of spaced-apart metal islands. These metal islands may be aligned along a longitudinal axis of the resonator body. A size of the at least one stiffness-enhanced polycrystalline semiconductor region may be sufficient to yield an increase in resonant frequency of the resonator body relative to an otherwise equivalent resonator having a single crystal resonator body that is free of mass-loading by the metal.
  • Item
    System And Method For The Wireless Sensing Of Physical Properties
    ( 8/29/2000) Georgia Institute of Technology ; Allen, Mark G. ; English, Jennifer M.
    Several sensors are provided for determining one of a number of physical properties including pressure, temperature, and other physical conditions. In general, the sensors feature a resonant circuit with an inductor coil which is electromagnetically coupled to a transmitting antenna. When an excitation signal is applied to the antenna, a current is induced in the sensor circuit. This current oscillates at the resonant frequency of the sensor circuit. The resonant frequency and bandwidth of the sensor circuit is determined using an impedance analyzer, a transmitting and receiving antenna system, or a chirp interrogation system. The resonant frequency may further be determined using a simple analog circuit with a transmitter. The sensors are constructed so that either the resonant frequency or bandwidth of the sensor circuit, or both, are made to depend upon the physical properties such as pressure, temperature, presence of a chemical species, or other condition of a specific environment. The physical properties are calculated from the resonant frequency and bandwidth determined.
  • Item
    Optical Waveguides Formed From Nano Air-gap Inter-layer Dielectric Materials And Methods Of Fabrication Thereof
    ( 9/20/2005) Georgia Institute of Technology ; Mule', Tony ; Kohl, Paul ; Meindl, James D. ; Padovani, Agnes ; Gaylord, Thomas K. ; Glytsis, Elias N. ; Allen, Sue Ann B.
    Waveguides and methods of fabrication thereof are presented. A representative waveguide includes a waveguide core and a cladding layer, where the cladding layer surrounds the waveguide core. The waveguide core and cladding can be made of a host material having a plurality of nano-pores, wherein the nano-pores include a sacrificial material, and the sacrificial material can be selectively decomposed in both the core and cladding layers to form a plurality of nano air-gaps.
  • Item
    Hardware-Assisted Log Protection Devices And Systems
    ( 1/30/2018) Georgia Institute of Technology ; Lee, Junghee ; Kim, Jongman
    A hardware-assisted technique may protect a system log from attackers, regardless of an attacker's acquired privileges at the host system. In some embodiments, the technique may employ specialized hardware, e.g., in the form of an add-on peripheral card. The hardware may be connected to a commodity server through a standard bus. Said hardware may stores log files from a host system while permitting only read and append operations from the host system. Thus, even if the attacker obtains root privileges at the host system, removal through the host system of logs may be prevented because the asymmetric interface does not support such commands from the host system. In some embodiments, an existing log file storage path at the host system may be maintained, reducing the required change to implement the disclosed techniques within existing server setups. Further, any performance degradation due to the techniques may be small to negligible.
  • Item
    Hybrid Inorganic-organic Polymer Electrolyte Membranes (PEMS) Based On Alkyloxysilane Grafted Thermoplastic Polymers
    ( 5/3/2011) Georgia Institute of Technology ; Li, Siwen ; Liu, Meilin ; Sun, Qunhui ; Li, Wen
    A composition of matter is formed from a graftable polymer, having graftable sites onto which sidechains have been grafted. The sidechains include at least one silane group, and may be formed by polymerization of a polymerizable group of a silane precursor. These compositions may further include acid groups, and may be used, for example, in improved proton conducting materials in fuel cells.
  • Item
    Feed Mechanism For A Geodesic Lens
    ( 3/10/1981) Georgia Institute of Technology ; Goodman Jr., Robert M.
    A feed system for a geodesic Luneberg lens antenna system is disclosed, in which sequential cyclical scanning of a plurality of feed sectors of the lens from one transmitter/receiver is achieved with a minimum of dead time between successive scans.
  • Item
    Apparatus And Method For Field Testing Mov Arresters
    ( 1/23/2007) Georgia Institute of Technology ; Coffeen, Larry T. ; Angeli, Eric M.
    Embodiments test MOV arresters. One embodiment comprises applying a plurality of voltages to a high voltage lead of the MOV arrester, the plurality of voltages being changed between an initial test voltage and final test voltage (corresponding to a point of conduction of a reference MOV arrester); determining a resistive current through the MOV arrester for each of the voltages; determining information corresponding to the resistive current when the applied test voltage corresponds to the point of conduction of the reference MOV arrester; comparing the determined information with information associated with the point of conduction of the reference MOV arrester; determining that the MOV arrester has passed the test when the determined information corresponds to the information associated with the reference MOV arrester; and determining that the MOV arrester has failed the test when the determined information does not correspond to the information associated with the reference MOV arrester.
  • Item
    Dual-Energy CT Through Primary Beam Modulation
    ( 11/16/2021) Georgia Institute of Technology ; Zhu, Lei ; Petrongolo, Jr. Michael Joseph
    Disclosed herein is a system and method, which utilize primary beam modulation to enable single-scan dual-energy CT (DECT) on a conventional CT scanner. An attenuation sheet with a spatially-varying pattern is placed between the x-ray source and the imaged object. During the CT scan, the modulator selectively hardens the x-ray beam at specific detector locations. Thus, this method simultaneously acquires high and low energy data at each projection angle. High and low energy CT images can then reconstructed from the projections via an iterative CT reconstruction algorithm, which accounts for the spatial modulation of the projected x-rays.
  • Item
    Stacked Mechanical Nanogenerator Comprising Piezoelectric Semiconducting Nanostructures And Schottky Conductive Contacts
    ( 8/23/2011) Georgia Institute of Technology ; Wang, Zhong L. ; Xu, Sheng
    An electric power generator includes a first conductive layer, a plurality of semiconducting piezoelectric nanostructures, a second conductive layer and a plurality of conductive nanostructures. The first conductive layer has a first surface from which the semiconducting piezoelectric nanostructures extend. The second conductive layer has a second surface and is parallel to the first conductive layer so that the second surface faces the first surface of the first conductive layer. The conductive nanostructures depend downwardly therefrom. The second conductive layer is spaced apart from the first conductive layer at a distance so that when a force is applied, the semiconducting piezoelectric nanostructures engage the conductive nanostructures so that the piezoelectric nanostructures bend, thereby generating a potential difference across the at semiconducting piezoelectric nanostructures and also thereby forming a Schottky barrier between the semiconducting piezoelectric nanostructures and the conductive nanostructures.
  • Item
    Fully Integrated Magnetic Micromotors And Methods For Their Fabrication
    ( 6/1/1999) Georgia Institute of Technology ; Allen, Mark G. ; Ahn, Chong-hyuk
    A planar fully integrated variable reluctance micromotor (10) is microfabricated on a substrate base (18). The micromotor includes a pin (19), rotor (12) with radially extending poles (16), and a stator (20) having a plurality of poles (21) configured in pairs (22) circumferentially spaced about the rotor. The rotor is microfabricated in place, or in situ, contiguous to the substrate base. The pairs of stator poles include a multilevel core (26) wrapped around a meander conductor (27) which is connected to bonding pads (32). The variable reluctance micromotor is particularly adapted to operating as a micropump (45) for conductive fluids.