U.S. flag

An official website of the United States government

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.

Search Publications

NIST Authors in Bold

Displaying 10951 - 10975 of 74030

Modeling the polarized X-ray scattering from periodic nanostructures with molecular anisotropy

December 1, 2017
Author(s)
Christopher D. Liman, Thomas A. Germer, Daniel F. Sunday, Dean M. DeLongchamp, Regis J. Kline
We discuss a new technique to measure molecular orientation in nanostructures using resonant soft X-rays. This technique is based on a variable angle transmission measurement called critical dimension X-ray scattering that enables the characterization of

Modeling, Validation and Verification of Three-Dimensional Cell-Scaffold Contacts from Terabyte- sized Images

December 1, 2017
Author(s)
Peter Bajcsy, Sowon Joy Yoon, Stephen Florczyk, Nathan Hotaling, Mylene H. Simon, Piotr Szczypinski, Nicholas J. Schaub, Carl G. Simon Jr., Mary C. Brady, Ram D. Sriram
Background: Cell-scaffold contact measurements are derived from pairs of co-registered volumetric fluorescent confocal laser scanning microscopy (CLSM) images (z-stacks) of stained cells and spun coat, large microfiber, and medium microfiber scaffolds. Our

On-site multi-kilowatt laser power meter calibration using radiation pressure

December 1, 2017
Author(s)
Paul A. Williams, Joshua A. Hadler, Brian J. Simonds, John H. Lehman
We have demonstrated the calibration of a thermal power meter against a radiation-pressure power meter in the range of 20 kW in a manufacturing test environment. The results were compared to a traditional calorimeter-based laboratory calibration undertaken

Optically Polarized He3

December 1, 2017
Author(s)
Thomas R. Gentile, P.J. Nacher, B Saam, T G. Walker
This article reviews the physics and technology of producing large quantities fo highly spin- polarized, or hyderpolarized, He3 nuclei using spin-exchange (SEOP) and metastability-exchange (MEOP) optical pumping, and surveys applications of polarized He3

Quantitative analysis of the impact of a human pathogenic mutation on the CCT5 chaperonin subunit using a proxy archaeal ortholog

December 1, 2017
Author(s)
Darion Spigolon, David Travis Gallagher, Adrian Velazquez-Campoy, Donatella Bulone, Jatin Narang, Pier San Biagio, Francesco Cappello, Alberto J. Macario, Everly Conway de Macario, Frank Robb
The human chaperonin complex is a 1 MDa nanomachine composed of two octameric rings formed from eight similar but non-identical subunits called CCT. Here, we are elucidating the mechanism of a heritable CCT5 subunit mutation that causes profound neuropathy

Selenium protein identification and profiling by mass spectrometry: A tool to assess progression of cardiomyopathy in a whale model

December 1, 2017
Author(s)
Colleen E. Bryan Sallee, Steven J. Christopher, William C. Davis, Lisa E. Kilpatrick, Gregory D. Bossart, Wayne E. McFee, Terrance X. O'Brien
Non-ischemic cardiomyopathy is a leading cause of congestive heart failure and sudden cardiac death in humans and in some cases the etiology of cardiomyopathy can include the downstream effects of an essential element deficiency. Of all mammal species

Symmetry-breaking inelastic wave-mixing atomic magnetometry

December 1, 2017
Author(s)
Feng Zhou, Edward W. Hagley, Lu Deng, Chengjie Zhu
The nonlinear magneto-optical rotation (NMOR) effect has prolific applications ranging from precision mapping of Earth's magnetic field to biomagnetic sensing. Studies on collisional spin relaxation effects have led to ultrahigh magnetic field

The Future of Quantum Based Measurements and the SI

December 1, 2017
Author(s)
Carl J. Williams
The U.S. National Institute of Standards and Technology (NIST), along with other NMIs, is preparing for a new era in the history of metrology made possible by the growing use of quantum-based standards and measurements. This development will dramatically

The SI and Quantum Metrology

December 1, 2017
Author(s)
Carl J. Williams
The United States’ National Institute of Standards and Technology (NIST) is playing a major role in the worldwide effort to base the International System of Units (SI) on fundamental constants. In many cases, units will be redefined in terms of invariant

Throughput Study for Channel Bonding in IEEE 802.11ac Networks

December 1, 2017
Author(s)
Munsuk Kim, Tanguy Ropitault, SuKyoung Lee, Nada T. Golmie
Several analytical models for the channel bonding feature of IEEE 802.11ac have been presented for performance estimation. However, the accuracy of such models is limited by the assumptions that there are no collisions or all nodes are in saturated state

Tissue Inhibitor of Metalloprotease-2: bioprocess development, physicochemical, biochemical and biological characterization of highly expressed recombinant protein

December 1, 2017
Author(s)
Ananda Chowdhury, Robert G. Brinson, Beiyang Wei, William G. Stetler-Stevenson
Tissue Inhibitor of Metalloprotease -2 (TIMP-2) is a secreted, 21 kDa, multifunctional protein. It was first described as an endogenous inhibitor of matrix metalloproteases (MMPs) that prevents protease-mediated breakdown of the extracellular matrix often

WIND LOAD FACTORS FOR USE IN THE WIND TUNNEL PROCEDURE

December 1, 2017
Author(s)
Emil Simiu, Adam L. Pintar, Dat Duthinh, DongHun Yeo
A 2005 Skidmore Owings and Merrill report notes that the ASCE 7 Standard is incomplete insofar as it provides no guidance on wind load factors appropriate for use with the Standard’s wind tunnel procedure. The purpose of this paper is to contribute to such
Displaying 10951 - 10975 of 74030