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Topic Area: Physics
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Displaying records 31 to 40 of 768 records.
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31. NIST traceable measurements of radiance and luminance levels of night-vision-goggle test-instruments
Topic: Physics
Published: 5/7/2014
Authors: George P Eppeldauer, Vyacheslav B Podobedov
Abstract: In order to perform radiance and luminance level measurements of night-vision-goggle (NVG) test instruments, NIST developed new-generation transfer-standard radiometers (TR). The new TRs can perform low-level radiance and luminance measurements with ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916064

32. First Accuracy Evaluation of NIST-F2
Topic: Physics
Published: 5/1/2014
Authors: Thomas Patrick Heavner, Steven R Jefferts, Jon Hardy Shirley, Thomas Edward Parker, Elizabeth A Donley, Neil Ashby, Stephan E Barlow, Filippo Levi, Giovanni Costanzo
Abstract: We report the first accuracy evaluation of NIST-F2, a second generation laser-cooled Cesium fountain primary standard developed at NIST with a cryogenic (Liquid Nitrogen) microwave cavity and flight region. The 80 K atom interrogation environment re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914839

33. WWVB Time Signal Broadcast: A New Enhanced Broadcast Format and Multi-Mode Receiver
Topic: Physics
Published: 5/1/2014
Authors: John P Lowe, Yingsi Liang, Oren Eliezer, Dinesh Rajan
Abstract: WWVB is a broadcast station, operated by the National Institute of Standards and Technology, that has been broadcasting time information to radio-controlled clocks (RCC) throughout the continental US since 1965. The transmitted information includes t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915289

34. An optically-modulated zero-field atomic magnetometer with suppressed spin-exchange broadening
Topic: Physics
Published: 4/29/2014
Authors: Ricardo Jimenez Martinez, Svenja A Knappe, John E Kitching
Abstract: We implement an optically-pumped 87Rb magnetometer based on a zero-field dispersive resonance enabled by the optical modulation of the 87Rb ground state energy levels. The magnetometer is operated in the spin-exchange relaxation-free regime where hig ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914207

35. Time-resolved double-slit interference pattern measurement with entangled photons
Topic: Physics
Published: 4/28/2014
Authors: Lynden Krister Shalm, Thomas Jennewein, Kevin Resch, Piotr Kolenderski, Carmelo Scarcella, Kelsey D. Johnsen Johnsen, Deny Hamel, Cahterine Holloway, Simone Tisa, Alberto Tosi
Abstract: The double-slit experiment strikingly demonstrates the wave-particle duality of quantum objects. In this famous experiment, particles pass one-by-one through a pair of slits and are detected on a distant screen. A distinct wave-like pattern emerg ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913512

36. Sensor Calibration and Characterization to Meet Climate Monitoring Requirements
Topic: Physics
Published: 4/24/2014
Authors: Catherine C Cooksey, Gerald T Fraser, Howard W Yoon
Abstract: The challenge of detecting small changes in the Earth's climate system over decadal and longer time scales places stringent requirements on environmental monitoring systems. Sensors must be well calibrated and maintain their calibration in challengin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915271

37. Preparation of nanocomposite plasmonic films made from cellulose nanocrystals or mesoporous silica decorated with unidirectionally aligned gold nanorods
Topic: Physics
Published: 4/11/2014
Authors: Michael Campbell, Qingkun Liu, Aric Warner Sanders, Julian Evans, Ivan I. Smalyukh
Abstract: Using liquid crystalline self-assembly of cellulose nanocrystals, we achieve long-range alignment of anisotropic metal nanoparticles in colloidal nanocrystal dispersions that are then used to deposit thin structured films with ordering features h ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915636

38. The hyperfine Paschen-Back Faraday effect
Topic: Physics
Published: 3/26/2014
Authors: Svenja A Knappe, M.A. Zentile, Rebecca Andrews, L. Weller, C.S. Adams, I.G. Hughes
Abstract: We investigate experimentally and theoretically the Faraday effect in an atomic medium in the hyperfine Paschen-Back regime, where the Zeeman interaction is larger than the hyperfine splitting. We use a small permanent magnet and a micro-fabricated ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915173

39. Dual-polarization-sensitive kinetic inductance detectors for balloon-borne, sub-millimeter polarimetry
Topic: Physics
Published: 3/20/2014
Authors: James A Beall, Daniel T Becker, Justus A Brevik, Hsiao-Mei Cho, Gene C Hilton, Kent D Irwin, Dale Li, David P Pappas, Jeffrey Lee Van Lanen, Johannes Hubmayr
Abstract: We are developing arrays of kinetic inductance detectors for sub-millimeter polarimetry that will be deployed on the BLAST balloon-borne instrument. The array is feedhorn-coupled, and each pixel contains two lumped-element kinetic inductance dete ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914331

40. Optical amplification and pulse interleaving for low noise photonics microwave generation
Topic: Physics
Published: 3/12/2014
Authors: Franklyn J Quinlan, Frederick Nicholas Baynes, Tara Michele Fortier, Qiugui Zhou, Allen Cross, Joe Campbelll, Scott A Diddams
Abstract: We investigate the impact of pulse interleaving and optical amplification on the spectral purity of microwave signals generated by photodetecting the pulsed output of an Er:fiber-based optical frequency comb. It is shown that the microwave phase nois ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915084



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