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Topic Area: Physics
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Displaying records 731 to 740 of 774 records.
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731. Two-Way Satellite Time and Frequency Transfer Using 1 MChip/S codes
Topic: Physics
Published: 11/16/2009
Authors: Victor Shufang Zhang, Thomas Edward Parker, Demetrios Matsakis, Joseph Achkar, Daniele Rovera, Dirk Piester, Andreas Bauch, Luca Lorini
Abstract: The Ku-band transatlantic and Europe to Europe two-way satellite time and frequency transfer (TWSTFT) operations used the 2.5 MChip/s pseudo-random codes with 3.5 MHz bandwidth until the end of July, 2009. The cost of TWSTFT operation is associated w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904297

732. Ultra-Broadband Frequency Comb Generation in Superconducting Resonators
Topic: Physics
Published: 10/30/2014
Authors: David P Pappas, Michael Robert Vissers, Martin Olof Sandberg, Jiansong Gao, Steven R Jefferts, Robert P Erickson
Abstract: Multi-octave frequency combs are generated in superconducting microresonators due to their low loss, strong Kerrlike kinetic inductance nonlinearity, and low frequency dispersion. This effect is illustrated at low frequency (60 MHz to 20 GHz) in long ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915796

733. Ultra-Cold Collisions of Atoms and Molecules
Topic: Physics
Published: Date unknown
Author: Paul S Julienne
Abstract: The study of collisions of neutral atoms and molecules at ultralow collision energies is made possible by advances in techniques for cooling and trapping such species. Excellent reviews of laser cooling of atoms are given in the Nobel Lectures of Ch ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840407

734. Ultra-Low Level Plutonium Isotopes in the NIST SRM 4355A (Peruvian Soil-1)
Topic: Physics
Published: 1/9/2009
Authors: Kenneth G Inn, Jerome LaRosa, Svetlana Nour, James J Filliben, George Brooks, Stephen Lamont, Rob Steiner, Ross Williams, Brad Patton, Debbie Bostick, Gregory Eiden, Steve Petersen, Donna Beals, James Cadieux, Greg Hall, Steve Goldenberg, Stephen Vogt
Abstract: For more than 20 years, countries and their agencies which monitor discharge sites and storage facilities have relied on the National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) 4355 Peruvian Soil reference material ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901118

735. Ultra-Low-Field NMR Relaxation and Diffusion Measurements Using an Optical Magnetometer
Topic: Physics
Published: 7/31/2014
Authors: John E Kitching, P. Ganssle, H Shin, Scott J Seltzer, Vikram S. Bajaj, Micah P. Ledbetter, Dimitry Budkerl, Svenja A Knappe, A Pines
Abstract: In this work, we have demonstrated for the first time that an alkali vapor cell magnetometer has sufficient sensitivity to chemically resolve a heterogeneous mixture of oil and water by its relaxation and diffusion properties, both in one dimensional ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914492

736. Ultra-cold mechanical resonators coupled to atoms in an optical lattice
Topic: Physics
Published: 9/17/2009
Authors: Andrew Geraci, John E Kitching
Abstract: We propose an experiment utilizing an array of cooled micro-cantilevers coupled to a sample of ultra-cold atoms trapped near a micro-fabricated surface. The cantilevers allow individual lattice site addressing for atomic state control and readout, an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903004

737. Ultra-low noise regenerative frequency divider
Topic: Physics
Published: 11/11/2012
Authors: Archita Hati, Craig W Nelson, Corey Andrew Barnes, Danielle Grace Lirette, Jason A. (Jason) DeSalvo, David Allan Howe
Abstract: We designed ultra-low noise regenerative divider-by-2 circuits that operate at input frequencies of 20 MHz and 10 MHz. We achieved residual output-referred single-sideband phase noise below -162 dBc/Hz at 10 Hz offset for a single divider at these f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910794

738. Ultra-low-noise Regenerative Frequency Divider for High Spectral Purity RF Signal Generation
Topic: Physics
Published: 5/24/2012
Authors: Archita Hati, Craig W Nelson, Corey Andrew Barnes, Danielle Grace Lirette, Jason A. (Jason) DeSalvo, Tara Michele Fortier, Franklyn J Quinlan, Andrew D Ludlow, Till P Rosenband, Scott A Diddams, David Allan Howe
Abstract: We implement an ultra-low-noise frequency divider chain from 8 GHz to 5 MHz that utilizes custom-built regenerative frequency divide-by-2 circuits. The single-sideband (SSB) residual phase noise of this regenerative divider at 5 MHz output is -163 dB ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911522

739. Ultrafast element-specific magnetization Dynamics of complex magnetic materials on a table-top
Topic: Physics
Published: 12/21/2012
Authors: Thomas J Silva, Justin M Shaw, Hans T. Nembach, Chan La-O-Vorakiat, Henry C. Kapteyn, Margaret M. Murnane, Stefan Mathias, Roman Adam, Patrik Grychtol, Martin Aeschlimann, Claus M. Schneider, Emrah Turgut, Dennis Rudolf
Abstract: We review recent progress in femtosecond magnetization dynamics probed by extreme ultraviolet pulses from high-harmonic generation. In a transverse magneto-optical Kerr geometry, we establish an ultrafast, element-specific experimental capability - ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904322

740. Ultrafast manetization enhancement in metallic multilayers driven by superdiffusive spin current
Topic: Physics
Published: 9/4/2012
Authors: Thomas J Silva, Justin M Shaw, Hans T. Nembach, Dennis Rudolf, Chan La-O-Vorakiat, Marco Battiato, Roman Adam, Emrah Turgut, Stefan Mathias, Margaret M. Murnane, Henry C. Kapteyn, Claus M. Schneider
Abstract: Uncovering the physical mechanisms that govern ultrafast charge and spin dynamics is crucial for understanding correlated matter as well as the fundamental limits of ultrafast spin-based electronics. Spin dynamics in magnetic materials can be driven ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911061



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