An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
We investigate a life time broadened and coherently prepared five-state system for multi-wave mixing processes. We show that very efficient wave mixing occurs...
Michael L. Chabinyc, Fred Endicott, B D. Vogt, Dean DeLongchamp, Eric K. Lin, Yiliang Wu, Ping Liu, Beng S. Ong
The effects of humidity on unencapsulated polymeric thin-film transistors (TFTs) were investigated. TFTs were fabricated on glass substrates with inorganic gate...
A I. Norman, Wenhua Zhang, Kathryn L. Beers, Eric J. Amis
A small-angle light scattering (SALS) apparatus, coupled with a specially designed microfluidic device was used, to monitor the structure of a diblock copolymer...
We present measured values of the refractive index, thermo-optic coefficient, and absorption coefficient of a number of common organic solvents and aqueous...
Donna C. Hurley, Malgorzata Kopycinska-Mueller, D Julthongpiput, Michael J. Fasolka
The effects of surface functionality and relative humidity (RH) on nanomechanical properties were investigated using atomic force acoustic microscopy (AFAM), a...
Vladislav Gerginov, K Calklins, Carol Tanner, John J. McFerran, Scott A. Diddams, A Bartels, Leo W. Hollberg
High resolution laser spectroscopy of 6s 2S 1/2 – 6p 2P 1/2 transition (D1 line) in neutral 133Cs is performed in a highly collimated thermal atomic beam using...
Vladislav Gerginov, K Calklins, B Tanner, John J. McFerran, Scott A. Diddams, Albrecht Bartels, Leo W. Hollberg
High resolution laser spectroscopy of 6s 2S 1/2 – 6p 2P 1/2 transition (D 1 line) in neutral 133Cs is performed in a highly collimated thermal atomic beam using...
Akira Fujiwara, Hiroshi Inokawa, Kenji Yamazaki, Hideo Namatsu, Yasuo Takahashi, Neil M. Zimmerman, Stuart Martin
Single-electron tunnelling (SET) transistors 1 are now of great and wide interest as basic elements for future applications such as low-power nanoelecronics 2...
K J. Langenbach, John T. Elliott, Alessandro Tona, Anne L. Plant
The response of cells to their environment is complex, not only because of the many chemical, mechanical, and other features of the environment that they...
Alexey Taychenachev, V Yudin, Christopher W. Oates, C Hoyt, Zeb Barber, Leo W. Hollberg
We propose a method that uses a static magnetic field to enable direct optical excitation of forbidden electric dipole transitions that are otherwise...
Zeb Barber, C Hoyt, Christopher W. Oates, Leo W. Hollberg, A. V. Taichenachev, V. I. Yudin
We report direct single laser excitation of the strictly forbidden (6s 2) 1S 0 –(6s6p) 3P 0 clock transition in the even 174Yb isotope confined to a 1-D optical...
The Rockwell hardness (HR) test is a valuable and widely used indentation hardness test for evaluating mechanical properties of metallic materials. For the...
Dylan F. Williams, Hassen Khenissi, Fabien Ndagijimana, Catherine A. Remley, Joel Dunsmore, Paul D. Hale, Jack Wang, Tracy S. Clement
We describe a straightforward method of separately characterizing up-conversion and down-conversion in microwave mixers with a sampling oscilloscope. The method...
Indirect verification tests, used to verify the performance of Charpy impact machines according to ASTM Standard E23, are evaluated by the National Institute of...
Richard W. Bukowski, R P. Fleming, Jeffrey Tubbs, Christopher Marrion, Jill Dirksen, Chris Duke, Debbie Prince, Lee F. Richardson, Dave Beste, Dottie Stanlaske
The development of firefighter elevators and special application egress elevators is reviewed. Recent activities of the elevator industry and NIST to develop...
Edward J. Garboczi, Geraldine S. Cheok, William C. Stone
In previous publications, we have shown how using x-ray computed tomography to obtain the raw 3-D data for the coordinates of the surface, and then converting...
S. H. McLaren, D. Gao, L. Chen, J. R. Eshleman, V. Dawson, M. A. Trush, V. Bohr, M. Dizdaroglu, G. M. Williams, C. Wei
Graft failure in coronary artery bypass grafts (CABGs) utilizing the saphenous vein is significantly higher than in those utilizing the internal mammary artery...
Robert E. Chapman, Priya D. Lavappa, Amy S. Rushing
Economic tools are needed to help the owners and managers of commercial and institutional buildings to select cost-effective combinations of protection...
N Smith, Sung Kim, Prasad T. Reddy, David T. Gallagher
ABSTRACT: The crystal structure of the class IV adenylyl cyclase from Yersinia pestis is reported at 1.9 resolution. The class IV fold is distinct from the...
Christopher W. Meyer, Douglas C. Meier, Christopher B. Montgomery, Stephen Semancik
A fluorescence microscope has been constructed for measuring surface temperatures of microhotplate platforms. The microscope measures temperature-dependent...
Abstract: Self-organization is central to the formation of numerous biological structures and the emulation of this process through the creation of synthetic...
Zeb Barber, C Hoyt, Christopher W. Oates, Leo W. Hollberg, A. V. Taichenachev, V. I. Yudin
We report direct single laser excitation of the strictly forbidden (6s 2) ^s1S_0-(6s6p)^ 3P_0 clock transition in the even 174Yb isotope confiend to a 1-D...
Chang Xu, Tao Wu, Charles M. Drain, J Batteas, Michael J. Fasolka, Kathryn L. Beers
Block copolymer (BC) brush gradient libraries were explored as high-throughput platforms to study the effect of relative block thickness on the BC response to...
Ion-implanted materials are commonly used in secondary-ion mass spectrometry for the calibration of instruments. This international Standard was prepared to...