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Displaying records 641 to 650 of 733 records.
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641. The Development of a Unified Time and Frequency Program in the SIM Region
Topic: Physics
Published: 9/1/2010
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero
Abstract: The Sistema Interamericano de Metrologia (SIM) is one of five major regional metrology organizations (RMOs) recognized by the Bureau International des Poids et Mesures (BIPM). SIM is composed of the national metrology institutes (NMIs) located in th ...

642. The Evolution of Time Measurement Part V: Radio Controlled Clocks
Topic: Physics
Published: 4/1/2012
Author: Michael A Lombardi
Abstract: A historical article about the origins and the development of radio controlled clocks (Part IV of a IV-part series). It describes the first time signal radio stations, the early use of telegraphic time codes, and the modern use of digital time codes. ...

643. The Evolution of Time Measurement, Part 2 - Quartz Clocks
Topic: Physics
Published: 10/1/2011
Author: Michael A Lombardi
Abstract: A historical article about the origins and the development of quartz clocks and oscillators (Part II of a IV-part series). It describes the discovery of piezoelectricity, the development of the first quartz oscillators, how quartz oscillators were i ...

644. The Evolution of Time Measurement: Part 3 - Atomic Clocks; The Evolution of Time Measurement: Part 4 - Atomic Second
Topic: Physics
Published: 2/1/2012
Author: Michael A Lombardi
Abstract: A historical article about the origins and the development ofatomic clocks and oscillators (Part III of a IV-part series). It describes the first atomic clock experiments, early laboratory and commercial cesium clocks, and the transition from astron ...

645. The Fifth SeaWiFS Intercalibration Round-Robin Experiment (SIRREX-S), July 1996
Topic: Physics
Published: 10/1/1999
Authors: Bettye C Johnson, Howard W Yoon, Sally Skidmore Bruce, Ping-Shine Shaw, E A Thompson, S B. Hooker, R Barnes, R Eplee, S Maritorena, J Mueller
Abstract: This report documents the fifth Sea-viewing Wide Field-of-view Sensor (SeaWiFS) Intercalibration Round-Robin experiment (SIRREX-5), which was held at the National Institute of Standards and Technology (NIST) on 23 July to 30 July 1996. The agenda fo ...

646. The First Measurements with Octave-Spanning Femtosecond Laser Frequency Combs
Topic: Physics
Published: 3/13/2004
Authors: Scott A Diddams, David J. Jones
Abstract: Here we describe in a historical manner the first optical frequency measurement measurements with octave-spanning frequency combs and the first measurement and stabilization of the carrier-envelope offset frequency for a train of femtosecond laser pu ...

647. The Habitable-Zone Planet Finder: A Stabilized Fiber-Fed NIR Spectrograph for the Hobby-Eberly Telescope
Topic: Physics
Published: 9/24/2012
Authors: Scott A Diddams, Suvrath Mahadevan, Lawrence W. Ramsey , Chad F. Bender, Ryan Terrien, Jason T. Wright, Samuel Halverson, Fred Hearty, M Nelson, Adam Burton, Stephen Lewis Redman, Steve Osterman, James Kasting, Michael Endl
Abstract: We present the scientific motivation and conceptual design for the recently funded Habitable-zone Planet Finder (HPF), a stabilized fiber-fed near-infrared (NIR) spectrograph for the 10 meter class Hobby-Eberly Telescope(HET) that will be capable of ...

648. The Impact of Dispersion on Amplitude and Frequency Noise in a Yb-fiber Laser Comb
Topic: Physics
Published: 5/1/2011
Authors: Lora L Nugent-Glandorf, Todd Johnson, Yohei Kobayashi, Scott A Diddams
Abstract: We describe a Yb-fiber based laser comb, with a focus on the relationship between net cavity dispersion and the amplitude noise and frequency noise on the comb. While tuning the net cavity dispersion from anomalous to normal, we measure the amplitude ...

649. The Infrared Spectra of C2H4+ and C2H3 Trapped in Solid Neon
Topic: Physics
Published: 2/14/2011
Authors: Marilyn E Jacox, Warren Elwin Thompson
Abstract: When a mixture of ethylene in a large excess of neon is codeposited at 4.3 K with a beam of neon atoms that have been excited in a microwave discharge, two groups of product absorptions appear in the infrared spectrum of the deposit. Similar studies ...

650. The Materials Dosimetry Reference Facility (MDRF)
Topic: Physics
Published: 1/1/1992
Authors: J A Grundl, E D Mcgarry, A I Hawari, P A Simpson, R Venkataraman, Charles M. Eisenhauer

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