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Displaying records 331 to 340 of 470 records.
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331. Kinetic Inductance Contributions to the Nonlinear Response of Superconductors at Microwave Frequencies
Topic: Bioscience & Health
Published: 7/11/2003
Authors: James C Booth, Kenneth Leong, Susan Schima
Abstract: We demonstrate how nonlinear effects in high temperature superconducting thin films can be quantified based on a current-dependent penetration depth {lambda}(J). Using an assumed form for {lambda}(J), we calculate the expected third-order harmonic si ...

332. A Self-Attenuating Superconducting Transmission Line for Use as a Microwave Power Limiter
Topic: Bioscience & Health
Published: 6/1/2003
Authors: James C Booth, David A Rudman, Ronald H. Ono
Abstract: We have designed, fabricated, and tested a microwave power limiter based on high temperature superconductor thin film technology. The signal limiter takes the form of a 50 {Ohm} coplanar waveguide transmission line that is reversibly driven from the ...

333. Description of the Nonlinear Behavior of Superconductors Using a Complex Conductivity
Topic: Bioscience & Health
Published: 6/1/2003
Authors: James C Booth, Susan Schima, Donald C. DeGroot
Abstract: The origin of the detrimental nonlinear response in the high Tc superconductor (HTS) microwave devices is currently not well understood. In order to help elucidate the origin of these nonlinear effects, we have performed phase-sensitive measurements ...

334. Influence of Impedance Mismatch Effects on Measurements of Unloaded Q Factors of Transmission Mode Dielectric Resonators
Topic: Bioscience & Health
Published: 6/1/2003
Authors: Kenneth Leong, James C Booth, Sang Yo Lee
Abstract: Precise measurements of the surface resistance of high temperature superconducting thin films using transmission mode dielectric resonators requires accurate knowledge of the unloaded Q factor. So far, the most accurate method of unloaded Q factor de ...

335. Microwave Surface Impedance and Nonlinear Properties of MgB^d2^ Films
Topic: Bioscience & Health
Published: 6/1/2003
Authors: James C Booth, Sang Yo Lee, Kenneth Leong, J. H. Lee, J. Lim, H. N. Lee, S. H. Moon, B. Oh
Abstract: We have measured the temperature dependence of the microwave surface impedance and the nonlinear response of high-quality MgB^d2^ films on c-cut sapphire at temperatures below 40 K. MgB^d2^ films with surface resistance (Rs) as low as 0.09 m{Ohm} at ...

336. Tandem Isotachophoresis-Zone Electrophoresis via Base-Mediated Destacking for Increased Detection Sensitivity in Microfluidic Systems
Topic: Bioscience & Health
Published: 5/21/2003
Authors: Wyatt N Vreeland, S J Williams, A E Barron, A P Sassi

337. Choosing a Cantilever for In Situ Atomic Force Microscopy
Topic: Bioscience & Health
Published: 4/1/2003
Author: John Taylor Woodward IV
Abstract: This manuscript is a non-peer reviewed, invited tutorial for Microscopy Today. It describes the issues involved in choosing a cantilever for atomic force microscope (AFM) imaging under fluids. In situ AFM imaging is an increasingly popular techniqu ...

338. Thermodynamics of Enzyme-Catalyzed Reactions
Topic: Bioscience & Health
Published: 3/1/2003
Authors: Robert Nathan Goldberg, Yadu D. Tewari
Abstract: This review, which has been prepared for the McGraw-Hill 2003 Yearbook of Science and Technology, gives an overview of the thermodynamics of enzyme-catalyzed reactions. Topics include the thermodynamic formalism(s) used in this field, computational ...

339. The Influence of Agarose Concentration in Gels on the Electrophoretic Trapping of Circular DNA
Topic: Bioscience & Health
Published: 1/1/2003
Authors: Kenneth D Cole, B. Akerman
Abstract: The concentration of agarose in electrophoresis gels was found to have significant effects on the apparent density and release characteristics of the electrophoretic traps for circular DNA. Agarose gels were cast in a range of concentrations from 0. ...

340. Thermodynamic Quantities for the Ionization Reactions of Buffers in Water
Topic: Bioscience & Health
Published: 12/1/2002
Authors: Robert Nathan Goldberg, N Kishore, R M. Lennen
Abstract: This table contains selected values for the pK, standard molar enthalpy of reaction {Delta}^dr^H , and standard molar heat-capacity change {Delta}^dr^C p for the ionization reactions of 64 buffers many of which are relevant to biochemistry and to bio ...

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