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Topic Area: Physics
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Displaying records 611 to 620 of 719 records.
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611. Synchronizing Computer Clocks by the Use of Kalman Filters
Topic: Physics
Published: 11/14/2011
Author: Judah Levine
Abstract: The National Institute of Standards and Technology (NIST) currently operates 35 public network time servers that are located at many different sites in the United States. The servers provide time messages over the public Internet in a number of diffe ...

612. Synthesis of ultrastable femtosecond pulse trains from an optical reference oscillator
Topic: Physics
Published: 6/1/2003
Authors: A Bartels, T M Ramond, Scott A Diddams, Leo W. Hollberg

613. System-Level Integration of a Chip-Scale Atomic Clock: Microwave Oscillator and Physics Package
Topic: Physics
Published: 11/7/2006
Authors: Alan Brannon, Vladislav Gerginov, Svenja A Knappe, Z Popovic, John E Kitching
Abstract: We report on our progress in developing a prototype Chip-Scale Atomic Clock with the integration of the local oscillator and the physics package. A discussion of the design and results is given with a focus on frequency stability, size, and power con ...

614. T-Shaped Quantum Wires in Magnetic Fields: Weakly Confined Magnetoexcitons Beyond the Diamagnetic Limit
Topic: Physics
Published: 3/1/2001
Authors: Garnett W Bryant, Y B Band
Abstract: Optical excitations of magnetoexcitons in T-shaped wires are calculated and compared with experiment. We find the single-particle states for electrons and holes confined to a wire in a magnetic field and use these states as a basis for calculations ...

615. Tables and Graphs of Electron-Interaction Cross Sections from 10 eV to 100 GeV Derived from the LLNL Evaluated Data Library (EEDL), Z=1-100
Topic: Physics
Published: 1/1/1991
Authors: D E Cullen, Stephen Michael Seltzer, S T Perkins

616. Techniques for microwave near-field quantum control of trapped ions
Topic: Physics
Published: 1/31/2013
Authors: Ulrich J. Warring, C. Ospelkaus, Yves Colombe, Kenton R. Brown, Jason Amini, M Carsjens, Dietrich G Leibfried, David J Wineland
Abstract: In Ospelkaus et al. [Nature 476, 181 (2011)] a microwave near-field quantum control of spin and motional degrees of freedom of one and two 25Mg+ ions enabled two-ion entanglement. In this report, we extend on the description of the experimental setup ...

617. Telling Time
Topic: Physics
Published: Date unknown
Author: Jonathan E Hardis
Abstract: In Low-Tech Blues [June], you note that we are surrounded by clocks, but lament the lack of systems to set them automatically. Our job is to help fix that. Your readers can use our time servers (www. to automat ...

618. Temperature analysis of low-expansion Fabry-Perot cavities
Topic: Physics
Published: 8/17/2009
Author: Richard W Fox
Abstract: A model of the temperature response of low-expansion glass Fabry-Perot cavities that includes structural distortion at the contacted mirrors compares well to frequency measurements of different cavities built with the same spacer. The path elongatio ...

619. Temperature dependence of the diffusive conductivity of bilayer graphene
Topic: Physics
Published: 8/24/2010
Authors: Shaffique Adam, Mark D Stiles
Abstract: Assuming diffusive carrier transport and employing an effective medium theory, we calculate the temperature dependence of bilayer graphene conductivity due to Fermi-surface broadening as a function of carrier density. We find that the temperature d ...

620. Temperature-Dependent Behavior of PbSc^d1/2^Nb^d1/2^O^d3^ From First Principles
Topic: Physics
Published: 7/1/2001
Authors: Eric J Cockayne, Benjamin P Burton, L Bellaiche
Abstract: We study the ferroelectric phase transition in PbSc1/2Nb1/2O3 (PSN) using a first-principles effective Hamiltonian approach. Results for PSN with NaCl-type ordering of Sc and Nb on the B sites shows that a Pb-centered effective Hamiltonian is approp ...

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