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Topic Area: Physics

Displaying records 1 to 10 of 731 records.
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1. Improvements in SIM Time Network and SIM Time Scale Performance
Topic: Physics
Published: 10/10/2014
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz, E. de Carlos-Lopez, Marina Gertsvolf, Ricardo de Carvalho
Abstract: We report recent results achieved within the Sistema Interamericano de Metrología (SIM) regarding the multinational cooperation program in the field of time and frequency metrology. We discuss the performance of the SIM Time Network (SIMTN) and the S ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916197

2. Improved Performance, Remote Realization, and Accessibility of the Inter-American Metrology System (SIM) Time Scale
Topic: Physics
Published: 8/7/2014
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz, E. de Carlos-Lopez
Abstract: The time and frequency metrology working group of the Inter-American Metrology System (SIM) has developed and currently maintains a number of measurement systems that are designed to coordinate frequency control and timekeeping throughout the America ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915600

3. Electro-optical frequency division and stable microwave synthesis
Topic: Physics
Published: 7/19/2014
Authors: Scott A Diddams, Jiang Li, Xu Li, Hansuek Lee, Kerry J. Vahala
Abstract: Optical frequency division using a mode-locked- laser, frequency comb has revolutionized time keeping and the generation of stable microwave signals. A different approach for optical frequency division and microwave generation using a comb of frequen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915710

4. Optical Passive Sensor Calibration for Satellite Remote Sensing and the Legacy of NOAA and NIST Cooperation
Series: Journal of Research (NIST JRES)
Report Number: 119.008
Topic: Physics
Published: 6/26/2014
Authors: Raju VSNU Datla , Michael Weinreb, Joseph Paul Rice, Bettye C Johnson, Eric L Shirley, Changyong Cao
Abstract: This paper traces the cooperative effort of the scientists at the National Oceanic and Atmospheric Administration (NOAA) and the National Institute of Standards and Technology (NIST) for improving the calibration of operational satellite sensors ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914026

5. Visible-frequency asymmetric transmission devices incorporating a hyperbolic metamaterial
Topic: Physics
Published: 6/17/2014
Authors: Ting Xu, Henri J Lezec
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915821

6. Large-area irradiance-mode spectral response measurements of solar cells by a light-emitting-diode- based integrating sphere source
Topic: Physics
Published: 5/30/2014
Authors: Behrang H Hamadani, John F Roller, Andrew M Shore, Brian P Dougherty, Howard W Yoon
Abstract: An irradiance-mode absolute differential spectral response measurement system based on a light emitting diode (LED) array is described. The LEDs are coupled to an integrating sphere whose output irradiance is uniform to better than 2 % over an ar ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915298

7. Optical hyperpolarization and NMR detection of ^u129^Xe on a microfluidic chip
Topic: Physics
Published: 5/20/2014
Authors: Ricardo Jimenez Martinez, Daniel J Kennedy, Michael Rosenbluh, Elizabeth A Donley, Svenja A Knappe, Scott J Seltzer, Hattie L Ring, Vikram S. Bajaj, John E Kitching
Abstract: We present a microfluidic chip that enables the production of laser-polarized 129Xe gas and its optical detection. Production of polarized 129Xe and its remote detection is achieved under flowing gas conditions at low magnetic fields in two separate ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913663

8. Phase and coherence of optical microresonator frequency combs
Topic: Physics
Published: 5/9/2014
Authors: William Loh, Pascal Patrice Del'Haye, Scott B Papp, Scott A Diddams
Abstract: We investigate the phase and coherence properties of microresonator combs using a combination of theoretical analysis, numerical simulation, and experimental measurement. Our analysis reveals that the comb phase in many cases does not stabilize to an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915304

9. 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

10. 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



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