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Displaying 51851 - 51875 of 74535

Toward a National Standards Strategy to Meet Global Needs

January 1, 1999
Author(s)
W G. Leight, K J. Leuteritz
On September 23, 1998, the National Institute of Standards and Technology (NIST) and the American National Standards Institute (ANSI) co-hosted a summit conference, Toward a National Standards Strategy To meet Global Needs. NIST Director Ray Kammer and

Trapping and Cooling of Potassium Isotopes in a Double-Magneto-Optical-Trap Apparatus

January 1, 1999
Author(s)
M Prevedelli, F S. Cataliotti, Eric A. Cornell, J R. Ensher, C Fort, L Ricci, G M. Tino, M Inguscio
We report on teh efficient operation of a double-magneto-optical-trap (MOT) apparatus for potassium isopes. Mechanisms for the cooling and the transfer between the two MOTs are studied. A magnetic quadrupole trap has been loaded from the second MOT

Ultrafast photodetectors with near-unity quantum efficiency

January 1, 1999
Author(s)
G. Ulu, M. Gvkkavas, M. S. {Umlat}nl{umlat}, N. Biyikli, E. {Omlat}zbay, Richard Mirin, David H. Christensen
We designed, fabricated and characterized Al xGa 1-xAs/GaAs p-i-n resonant cavity enhanced (RCE) photodetectors with near-unit quantum efficiency. The peak wavelength is in the 780-830 nm region and post-process adjustable by recessing the top surface

Ultrasonic Measurement of Stress in Pin and Hanger Connections

January 1, 1999
Author(s)
A V. Clark, David T. Gallagher, C S. Hehman, P A. Fuchs, M G. Lozev
Pin and hanger connections are used in bridges to suspend an interior span from the outer spans. The connections can sometimes lock up due to corrosion. If lockup ocurs the stresses in the connection are cycled due to thermal expanison and contraction of

Ultrasonic Measurement of the Dynamic Elastic Moduli of Small Metal Samples

January 1, 1999
Author(s)
John A. Slotwinski, Gerald V. Blessing
Ultrasonic velocity measurements were used to determine the dynamic elastic moduli small metal samples to a 2[sigma] measurement uncertainty of less than one percent. The samples were cylindrical in shape, possessing nominal diameters of 12 mm, and

Ultrasonic Research and Applications in the NIST Manufacturing Engineering Laboratory

January 1, 1999
Author(s)
Gerald V. Blessing, Steven E. Fick, Nelson N. Hsu, John A. Slotwinski, D Xiang
The Ultrasonics Group in the NIST Manufacturing Engineering Laboratory performs research, develops standards, and offers calibration services in support of U.S. industry. Pulsed ultrasonic and acoustic emission techniques are pursued for application to
Displaying 51851 - 51875 of 74535
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