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 28001 - 28025 of 73929

Status Report on the First Round of the SHA-3 Cryptographic Hash Algorithm Competition

September 23, 2009
Author(s)
Andrew R. Regenscheid, Ray A. Perlner, Shu-jen H. Chang, John M. Kelsey, Mridul Nandi, Souradyuti Paul
The National Institute of Standards and Technology is in the process of selecting a new cryptographic hash algorithm through a public competition. The new hash algorithm will be referred to as SHA-3 and will complement the SHA-2 hash algorithms currently

Electromagnetic Fields in Cavities: Deterministic and Statistical Theories

September 21, 2009
Author(s)
David A. Hill
This book covers both deterministic and statistical theories of electromagnetic fields in cavities. Deterministic theory is based on resonant mode characteristics, such as quality factor, Q, and mode excitation via Dyadic Green s functions. Statistical

A Combinatorial Approach to Building Navigation Graphs for Dynamic Web Applications

September 20, 2009
Author(s)
Raghu N. Kacker, David R. Kuhn, James F. Lawrence, Wenhua Wang, Yu Lei, Sreedevi Sampath
Modeling the navigation structure of a dynamic web application is a challenging task because of the presence of dynamic pages. In particular, there are two problems to be dealt with: (1) the page explosion problem, i.e., the number of dynamic pages may be

Optical performance monitoring of PSK Data Channels using artificial neural networks trained with parameters derived from delay-tap asynchronous diagrams via balanced detection

September 20, 2009
Author(s)
Jeffrey A. Jargon, Xiaoxia Wu, Zhensheng Jia, Loukas Paraschis, Ronald Skoog, Alan Willner
We demonstrate a technique of using artificial neural networks for optical performance monitoring of PSK data signals. Parameters for training are derived from delay-tap asynchronous diagrams using balanced detection. We also compare the results with the

Unified Model for Bulk Acoustic Wave Resonators Nonlinear Effects

September 20, 2009
Author(s)
Eduard Rocas, Juan C. Collado Gomez, James C. Booth, Enrique Iborra, Robert Aigner
We present a nonlinear model for Bulk Acoustic Wave resonators that combines different sources of nonlinearity, using device-independent material specific parameters, to predict the intermodulation and harmonics generation. The actual model accounts for

First approaches to standard protocols and reference materials for the assessment of potential hazards associated with nanomaterials

September 19, 2009
Author(s)
Iseult Lynch, Hans Bouwmeester, Hans Marvin, Alan Casey, Gordon Chambers, Markus Berges, Martin Clift, Teresa Fernandes, Lise Fjellsbo, Lucienne Juillerat, Gert Roebben, Christoph Klein, Qinglan Wu, Vincent A. Hackley, Jean-Pierre Kaiser, Wolfgang Kreyling, C. Michael Garner, Peter Hatto, Kenneth Dawson, Michael Riediker
This report presents the outcome of the discussions of 60 experts in the field of safety assessment of manufactured NMs from academia, industry, government and non-profit organizations on some of the critical issues pertaining to the development of

Nanoindentation of Si Nanostructures: Buckling and Friction at Nanoscales

September 18, 2009
Author(s)
Huai Huang, Bin Li, Qiu Zhao, Zhiquan Luo, Jay Im, Min Kang, Richard A. Allen, Michael W. Cresswell, Rui Huang, Paul S. Ho
A nanoindentation system was employed to characterize mechanical properties of silicon nanolines (SiNLs), which were fabricated by an anisotropic wet etching (AWE) process. The SiNLs had the linewidth ranging from 24 nm to 90 nm, having smooth and vertical

NMR-Based Microbial Metabolomics and the Temperature-Dependent Coral Pathogen Vibrio coralliilyticus

September 18, 2009
Author(s)
Daniel W. Bearden, Arezue Boroujerdi, Tracey B. Schock, Alexander Meyers, Elizabeth C. Pollock, Sara Lien Huynh, Maria Vizcaino, Pamela J. Morris
Coral bleaching occurs when the symbioses between coral animals and their zooxanthellae is disrupted, either as part of a natural cycle or as the result of unusual events. The bacterium Vibrio coralliilyticus has been linked to coral disease globally (for

A Coherent Approach for Interrogating Polybenzoxazole Fibers for Residual Phosphoric Acid

September 17, 2009
Author(s)
Gale A. Holmes, Eun S. Park, Charles M. Guttman, Kathleen M. Flynn, John R. Sieber, Stephanie S. Watson, Kirk D. Rice
Because of the premature failure of soft-body armor that contains the active fiber poly [(benzo-[1,2-d:5,4-d']-benzoxazole-2,6-diyl)-1,4-phenylene] (PBO), the Office of Law Enforcement Standards (OLES) at the National Institute of Standards and Technology

Considering Discourse References in Textual Entailment Annotation

September 17, 2009
Author(s)
Luisa Bentivogli, Ido Dagan, Hoa T. Dang, Danilo Giampiccolo, Medea L. Leggio, Bernardo Magnini
In the 2009 Recognizing Textual Entailment (RTE) challenge, a Search Pilot task has been introduced, aimed at finding all the sentences in a corpus which entail a set of given hypotheses. The preparation of the data set for this task has provided an

Effects of high intensity neutron flux on in-situ spin-exchange optical pumping of He-3

September 17, 2009
Author(s)
Thomas R. Gentile, E Babcock, Stephen Boag, C. Becham, T E. Chupp, Gordon L. Jones, A K. Petukhov, T G. Walker
Prior studies revealed neutron beam-induced alkali-metal spin relaxation in 3He cells polarized in-situ by spin-exchange optical pumping. These effects are minor for neutron beams of low to moderate intensity, but become important at the highest neutron

Ultra-cold mechanical resonators coupled to atoms in an optical lattice

September 17, 2009
Author(s)
Andrew Geraci, John E. Kitching
We propose an experiment utilizing an array of cooled micro-cantilevers coupled to a sample of ultra-cold atoms trapped near a micro-fabricated surface. The cantilevers allow individual lattice site addressing for atomic state control and readout, and

A Statistical Path Loss Model for Medical Implant Communication Channels

September 16, 2009
Author(s)
Kamran Sayrafian, Wen-Bin Yang, John G. Hagedorn, Judith E. Terrill, Kamya Yazdandoost
Knowledge of the propagation media is a key step toward a successful transceiver design. Such information is typically gathered by conducting physical experiments, measuring and processing the corresponding data to obtain channel characteristics. In case

Large-Scale Integration of High-Performance Silicon Nanowire Field Effect Transistors

September 16, 2009
Author(s)
Qiliang Li, Xiaoxiao Zhu, Yang Yang, D. E. Ioannou, Hao Xiong, Doowon Kwon, John S. Suehle, Curt A. Richter
In this work we present a CMOS-compatible self-aligning process for the large-scale-integration of high performance nanowire field effect transistors with well-saturated drain currents, steep subthreshold slopes at low drain voltage and a large on / off

MORPHOLOGY AND FRACTURE OF ENAMEL

September 16, 2009
Author(s)
Sang-Won Myoung, James J. Lee, Paul Constantino, Peter Lucas, Brian R. Lawn
Teeth are remarkable biological structures, brittle but resilient. Here we examine the inter-relation between enamel morphology and crack resistance by sectioning human molar teeth after loading to fracture. The sections reveal that many cracks start from

Neutron Beta-Decay

September 16, 2009
Author(s)
Jeffrey S. Nico
Studies of low-energy processes, such as neutron beta-decay, contribute important information regarding die rent aspects of physics including nuclear and particle physics and cosmology. The information from these systems is often complementary to that

Effective three-body interactions of neutral atoms in optical lattices

September 15, 2009
Author(s)
Philip Johnson, Eite Tiesinga, James V. Porto, Carl J. Williams
We show that virtual excitations of neutral bosons to higher vibrational states in a three dimensional optical lattice generate effective, tunable, attractive three-body interactions. These effective processes can quickly decohere coherent states held in

PEG-HYDROGELS: SYNTHESIS, CHARACTERIZATION, AND CELL ENCAPSULATION

September 15, 2009
Author(s)
Sheng Lin-Gibson, Kaushik Chatterjee, James A. Cooper, William E. Wallace, Matthew Becker, Carl G. Simon Jr., Ferenc Horkay
A simple reaction to prepare controlled molecular mass (MM) poly(ethylene glycol) dimethacrylates (PEGDMs) of high purity and low polydispersity is outlined. PEGDMs were photo-polymerized to form hydrogels with and without bioactive moieties. The structure
Displaying 28001 - 28025 of 73929
Was this page helpful?