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Topic Area: Physics
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Displaying records 601 to 610 of 705 records.
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601. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50447

602. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840935

603. 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
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103605

604. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912579

605. 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. Bldrdoc.gov/timefreq/service/its.htm) to automat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841574

606. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902338

607. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904658

608. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850498

609. Testing Local Position Invariance with Four H Masers AND Four Cs Fountains
Topic: Physics
Published: 5/28/2007
Authors: Neil Ashby, Thomas Patrick Heavner, Steven R Jefferts, A Radnaev, Y Dudin
Abstract: We report the most sensitive tests to date of the assumption of local position invariance (LPI) underlying general relativity, based on a seven year comparison of cesium and hydrogen atomic clocks (frequency standards). The latest results place an up ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50569

610. Testing local position invariance with four Cesium fountain primary frequency standards and four NIST Hydrogen masers
Topic: Physics
Published: 2/16/2007
Authors: Neil Ashby, Thomas Patrick Heavner, Steven R Jefferts, Thomas Edward Parker, A Radnaev, Y Dudin
Abstract: Local Position Invariance (LPI), together with Local Lorentz Invariance (LLI) and the Weak Equivalence Principle (WEP) form the foundation of the General Theory of Relativity. LPI implies that if atomic clocks of different structures are placed toget ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50482



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