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Displaying 18626 - 18650 of 74035

Sodium Superionic Conduction in Na 2 B 12 H 12

April 11, 2014
Author(s)
Terrence J. Udovic, Matoaki Matsuo, Atsushi Unemoto, Kristina Verdal, Vitalie Stavila, Alexander V. Skripov, John J. Rush, Hitoshi Takamura, Shin-Ichi Orimo
The need for cheaper, Li-free battery technologies has prompted the search for new Na-ion-based electrolyte materials. One such material, Na 2B 12H 12, undergoes an entropy-driven transition upon heating from an ordered monoclinic structure to a disordered

Structural Basis for Inactivation of Giardia lamblia Carbamate Kinase by Disulfiram

April 11, 2014
Author(s)
Andrey Galkin, Liudmila Kulakova, Kap Lim, Catherine Chen, Wei Zhang, Illarion Turko, Osnat Herzberg
Carbamate kinase from Giardia lamblia is an essential enzyme for the survival of the organism. The enzyme catalyzes the final step in the arginine dihydrolase pathway converting ADP and carbamoyl phosphate to ATP and carbamate. We previously reported that

Terahertz Active and Passive Imaging

April 11, 2014
Author(s)
Erich N. Grossman, Joshua A. Gordon, David R. Novotny, Richard A. Chamberlin
We describe the results of bistatic scattering measurements covering 325-650 GHz on a series of wellcharacterized random rough test surfaces. These have implications for active THz imagers that use coherent sources for illumination. The mean scattered

10 nm Three-Dimensional CD-SEM Metrology

April 10, 2014
Author(s)
Andras Vladar, John S. Villarrubia, Bin Ming, Regis J. Kline, Jasmeet Chawla, Scott List, Michael T. Postek
The shape and dimensions of a challenging pattern have been measured using a model-based library scanning electron microscope (MBL SEM) technique. The sample consisted of a 4-line repeating pattern. Lines were narrow (10 nm), asymmetric (different edge

Phonon Localization Drives Polar Nanoregions in a Relaxor Ferroelectric

April 10, 2014
Author(s)
M. E. Manley, Jeffrey W. Lynn, D. L. Abernathy, E. D. Specht, O. Delaire, A. R. Bishop, R. Sahul, J. D. Budai
Relaxor Ferroelectrics 1, which are utilized as actuators and sensors 2-4, exemplify a class of poorly understood functional materials where an interplay between disorder and phase instability results in nanostructure. Foremost, there is no definitive

Interdependence Between Training and Magnetization Reversal in Granular Co-CoO Exchange Bias Systems

April 9, 2014
Author(s)
E. Menendez, T. Dias, J. Geshev, J. F. Lopez-Barbera, J. Nogues, R. Steitz, Brian Kirby, Julie Borchers, L.M.C. Pereira, A. Vantomme, K. Temst
The interdependence between training and magnetization reversal in granular Co-CoO exchange bias systems prepared by O ion implantation in Co thin films is demonstrated by polarized neutron reflectometry. The implantations result in rather uniform O depth

Recent advances in vacuum sciences and applications

April 9, 2014
Author(s)
Miran Mozetic, Kostya Ostrikov, David Ruzic, Davide Curreli, Uros Cvelbar, Alenka Vesel, Gregor Primc, Manfred Leisch, Karl Jousten, Oleg Malyshev, Jay H. Hendricks, laszlo Kover, Alberto Tagliaferro, O Conde, Antonio Silvestre, J Giapintzakis, M Buljan, N Radi?, G Dra?i?, S Bernstorff, H Biederman, O Kyli?n, J Hanu?, S Milo?evi?, A Galtayries, P Dietrich, W Unger, K Stana-Kleinschek, A Drmota?Petri?, Jean-Jacques Pireaux, J W. Rogers, M Anderle, M Lehocky, V Sedlarik
Recent advances in vacuum sciences and applications are reviewed. Novel optical interferometer cavity devices enable pressure measurements with ppm accuracy. Innovative dynamic vacuum standard allows for pressure measurements with temporal resolution of 2

AN EXAMINATION OF METAL DEPOSITION DERIVED FROM AEROSPACE-RELATED ACTIVITY IN SEVERAL ENVIRONMENTAL MATRICES COLLECTED FROM WATERS SURROUNDING THE KENNEDY SPACE CENTER (KSC), FLORIDA

April 8, 2014
Author(s)
John Bowden, Theresa M. Cantu, Douglas M. Scheidt, Russell H. Lowers, Brian A. Nocito, Vaneica Y. Young, Louis J. Guillette
Metal deposition originating from anthropogenic activity was examined in a two-tier study using environmental samples collected from several locations at the Kennedy Space Center (KSC) and surrounding Merritt Island National Wildlife Refuge (MINWR) with

Implementing an Innovation Corner in a Federal Research Library

April 8, 2014
Author(s)
Stacy M. Bruss
Innovation centers have been formed in many public and academic libraries. However, there are no known case studies to date of Federal libraries creating innovation centers. The NIST Research Library has begun implementing an innovation centers to provide

Isolated line shapes of molecular oxygen: ab initio calculations versus measurements

April 8, 2014
Author(s)
Vincent T. Sironneau, Joseph T. Hodges, Jean M. Hartmann, Julien Lamouroux
We present comparisons between measured isolated line shapes of molecular oxygen in air and those calculated, free of any adjusted parameter, using requantized Classical Molecular Dynamics Simulations (rCMDS). This work extends a previous study made for a

Nanoparticle Brush Architecture Controls Polymer Diffusion in Nanocomposites

April 8, 2014
Author(s)
Jihoon Choi, Michael-Jon A Hore, Nigel Clarke, Karen I. Winey, Russell J. Composto
We show that polymer diffusion in polymer nanocomposites (PNCs) is controlled by the architecture of polymer brushes grafted to silica nanoparticles (NPs). At highly grafting density, diffusing chains having radius of gyration, R g, are excluded from the

A Quantitative Study of Nanoparticle Release from Nanocoatings Exposed to UV Radiation

April 7, 2014
Author(s)
Li Piin Sung, Deborah S. Jacobs, Justin M. Gorham, Savelas A. Rabb, Xiaohong Gu, Lee L. Yu, Tinh Nguyen
Nanoparticles are increasingly used in polymer coatings (i.e., nanocoatings) to improve multiple properties of traditional coatings such as mechanical, electrical, gas barrier, and UV resistance. These high performance nanocoatings are often used in

International Comparison of Ku-band Standard Gain Horn Characterization

April 6, 2014
Author(s)
Jeffrey R. Guerrieri
International comparison of antenna measurement results between national measurement laboratories supports interoperability of communication equipment in today's world market. The National Institute of Standards and Technology (NIST) is the pilot National

International Comparison of Ku-band Standard Gain Horn Characterization

April 5, 2014
Author(s)
Jeffrey R. Guerrieri
International comparison of antenna measurement results between national measurement laboratories supports interoperability of communication equipment in today's world market. The National Institute of Standards and Technology (NIST) is the pilot National

A Prescription for THz Transistor Characterization

April 4, 2014
Author(s)
Dylan F. Williams
Advances in microwave wafer probes and vector network analyzers have opened up a whole new world of discovery in microwave metrology, making possible accurate on-wafer measurements in printed transmission lines at microwave, millimeter-wave, sub-millimeter

An Empirical Comparison of Combinatorial and Random Testing

April 4, 2014
Author(s)
Raghu N. Kacker, David R. Kuhn
Some conflicting results have been reported on the comparison between t-way combinatorial testing and random testing. In this paper, we report a new study that applies t-way and random testing to the Siemens suite. In particular, we investigate the

Improvements and Extensions of the Neutron Cross Section and Fluence Standards

April 4, 2014
Author(s)
Allan D. Carlson, V G. Pronyaev, R. Capote, F. J. Hambsch, F. Kappeler, C. Lederer, A Mengoni, R O. Nelson, A.J.M Plompen, P Schillebeeckx, S Simakov, S. Tagesen, H Vonach, A Vorobyev, A Wallner
Updated evaluations of the standards are needed within a few years for new versions of several cross section libraries, e.g.; ENDF/B and JEFF, that have been planned. To update the standards, a collaboration, supported by an IAEA Data Development Project

NIST and Computer Security

April 4, 2014
Author(s)
William E. Burr, Hildegard Ferraiolo, David A. Waltermire
The US National Institute of Standards and Technology's highly visible work in four key areas--cryptographic standards, role-based access control, identification card standards, and security automation--has and continues to shape computer and information

The Performance of Essential Facilities in Superstorm Sandy

April 4, 2014
Author(s)
Therese P. McAllister
Superstorm Sandy affected the functionality of a number of essential buildings and facilities in the flooded areas of New York and New Jersey. The flood elevations exceeded design-level floods in many locations, as defined by FIRM maps and codes and
Displaying 18626 - 18650 of 74035