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Displaying 2576 - 2600 of 4635

Atom-based stabilization for laser-pumped atomic clocks

March 27, 2006
Author(s)
Vladislav Gerginov, V Shah, Svenja A. Knappe, Leo W. Hollberg, John E. Kitching
Progress towards simplification and improvement of the long-term stability of chip-scale atomic clocks is presented. The conventional technique of laser optical frequency and cell temperature control is compared with a novel technique which avoids the use

Controlled Collapse of a Bose-Einstein Condensate

May 1, 2001
Author(s)
J L. Roberts, N R. Claussen, S L. Cornish, E A. Donley, Eric A. Cornell, C E. Wieman
The point of instability of a Bose-Einstein condensate (BEC) due to attractive interactions was studied. Stable 85Rb BECs were created and then caused to collapse by slowly changing the atom-atom interaction from repulsive to attractive using a Feshbach

Narrow-Line Doppler Cooling of Strontium to the Recoil Limit

April 1, 1999
Author(s)
K R. Vogel, Tim P. Dinneen, Alan Gallagher, J L. Hall
Experimental results on narrow line cooling line cooling of strontium atoms are presented. Doppler cooling is performed on the 1S o- 3P 1 intercombination transition at 689 nm resulting in temperatures near the recoil limit in a one-dimensional (1-D)

Conformational Changes in Active and Inactive States of Human PP2C? characterized by Hydrogen/Deuterium Exchange-Mass Spectrometry

May 8, 2017
Author(s)
Sharlyn Mazur, Elyssia S. Gallagher, Subrata Debnath, Stewart R. Durell, Kyle Anderson, Lisa M. Jenkins, Ettore Appella, Jeffrey W. Hudgens
… the binding of a third, catalytically essential metal ion. The binding of the third Mg2+ to PP2Cα was reported to … simulations suggest that the presence of the third metal ion and the D146A mutation each produce distinct …

Proton Dynamics of Two-Dimensional Oxalate-Bridged Coordination Polymers

August 28, 2014
Author(s)
Satoshi Miyatsu, Maiko Kofu, Atsushi Nagoe, Takeshi Yamada, Masaaki Sadakiyo, Teppei Yamada, Hiroshi Kitagawa, Madhu Sudan Tyagi, Victoria Garcia Sakai, Osamu Yamamuro
A two-dimensional porous coordination polymer (NH 4) 2HOOC(CH 2) 4COOH}[ZN 2(Co 2O 4) 3] (abbreviated to ZnADP), which accommodates water molecules between the [Zn 2(C 2O 4) 3] layers, is highly remarked as a new-type crystalline proton conductor. In order

Effects of the two-gap nature on the microwave conductivity of polycrystalline MgB2 films with a critical temperature of 39 K

December 1, 2002
Author(s)
James C. Booth, S. Y. Lee, J. H. Lee, Jung Hoon Han, S. H. Moon, H. N. Lee, John H. Claassen
… to have a "-band gap energy of #1.7 meV. For the MgB2 film ion milled down to the thickness of #320 nm, two coherence … "-band gap energy of #2.0 meV is higher than before ion milling. Reduced normalstate conductivity at TC and RS at temperatures below 15 K were found for the ion-milled film. Calculations based on the weak-coupling BCS …

Time Measurement at the Millennium

March 1, 2001
Author(s)
James C. Bergquist, Steven R. Jefferts, David J. Wineland
… The latest clocks use a single ion to measure time with an anticipated precision of on part …

Real-Time Measurement of Spontaneous Antigen-Antibody Dissociation

October 1, 2002
Author(s)
S Kulin, Rani B. Kishore, Joseph B. Hubbard, Kristian Helmerson
We report observation of real-time adhesion between a monoclonal IgE antibody and its specific DNP antigen. Both molecules are immobilized on the surfaces of different polystyrene microspheres trapped by optical tweezers. Monitoring spontaneous, thermally

Characterizing the thermal effects of High Energy Arc Faults

November 30, 2015
Author(s)
Anthony D. Putorti Jr., Nicholas Melly, Scott Bareham, Joseph E. Praydis
International and domestic operating experience involving High Energy Arc Faults (HEAF) in Nuclear Power Plant (NPP) electrical power systems have demonstrated the potential to cause extensive damage to electrical components and distribution systems along
Displaying 2576 - 2600 of 4635
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