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 24451 - 24475 of 73930

User's Guide for SRM 2494 and 2495: The MEMS 5-in-1, 2011 Edition

September 6, 2011
Author(s)
Janet M. Cassard, Jon C. Geist, Theodore V. Vorburger, David T. Read, David G. Seiler
The Microelectromechanical Systems (MEMS) 5-in-1 is a standard reference device sold as a NIST Standard Reference Material (SRM) that contains MEMS test structures on a test chip. The two SRM chips (2494 and 2495) provide for both dimensional and material

Measuring agglomerate size distribution and dependence of localized surface plasmon resonance absorbance on gold nanoparticle agglomerate size using analytical ultracentrifugation

September 3, 2011
Author(s)
Justin M. Zook, Vinayak Rastogi, Robert I. MacCuspie, Athena M. Keene, Jeffrey A. Fagan
Nanoparticles frequently agglomerate when dispersed into relevant biological and environmental media, with the resulting change to the effective size distribution dramatically affecting the potential nanotoxicity and the absorbance for biosensor

Absence of Long-Range Ordering in the Pyrochlore Compound Er 2 Sn 2 O 7

September 2, 2011
Author(s)
P. M. Sarte, H. J. Silverstein, B. T. K. Van Wyk, Jason S. Gardner, Yiming Qiu, H. D. Zhou, C. R. Wiebe
The low temperature behavior of powder Er 2Sn 2O 7 samples has been studied by magnetic susceptibility, heat capacity, and neutron scattering experiments. We report here the presence of no magnetic ordering down to 100 mK. Anomalies in the heat capacity

Control of magnetic fluctuations by spin current

September 2, 2011
Author(s)
Vladislav E. Demidov, Sergei Urazhdin, Eric Edwards, Mark D. Stiles, Robert McMichael, Sergej O. Demokritov
We utilize micro-focus Brillouin light scattering spectroscopy to study the interaction of spin current generated by the spin Hall effect with magnetic fluctuations in a Permalloy microdisc. We show that the fluctuations can be efficiently enhanced or

p-Wave Cold Collisions in an Optical Lattice Clock

September 2, 2011
Author(s)
Nathan D. Lemke, Andrew D. Ludlow, J. von Stecher, Jeffrey A. Sherman, A.M. Rey, Christopher W. Oates
State-of-the-art optical clocks with neutral atoms employ an optical lattice to tightly confine the atoms, enabling high-resolution spectroscopy and the potential for high-accuracy timekeeping. Interrogating many atoms simultaneously facilitates high

An Interlaboratory Stopwatch Comparison in the SIM Region

September 1, 2011
Author(s)
Michael A. Lombardi, Raul Solis, Harold Sanchez, J. Mauricio Lopez-Romero, Francisco Jimenez, Henry Postigo, Daniel Perez, Walter Adad, Victor Masi, Ahmed Ibrahim, Bill Hoger, Ricardo de Carvalho, Jose L. Kronenberg, Gustavo C. Orozco, Theodore Reddock, Leonardo Trigo
Stopwatches and timers are used for an almost unlimited number of applications and are among the most common devices calibrated by metrology laboratories. In large nations, stopwatch calibrations are typically handled by secondary laboratories, such as

Atomic Sensors - A Review

September 1, 2011
Author(s)
John E. Kitching, Svenja A. Knappe, Elizabeth A. Donley
We discuss the basic physics and instrumentation issues related to high performance physical and inertial sensors based on atomic spectroscopy.

Cost-Efficient Routing with Controlled Node Mobility in Sensor Networks

September 1, 2011
Author(s)
Kamran Sayrafian
In this paper, an energy-efficient strategy is proposed for tracking a moving target in a mobile sensor network. The energy expenditure of the sensors in the network is assumed to be due to communication, sensing and movement. First, the target area is

Experimental characterization and crystal plasticity finite element modeling of heterogeneous deformation in commercial purity titanium

September 1, 2011
Author(s)
Y Yang, L. Wang, C. Zambaldi, P. Eisenlohr, R. Barabash, W. Liu, Mark R. Stoudt, M. A. Crimp, T. R. Bieler
Heterogeneous deformation, including local dislocation shear activity and lattice rotation, was analyzed in microstructure patches of polycrystalline, commercial purity titanium specimens using three different experimental methods. Crystal plasticity

Low-Temperature Tunneling and Rotational Dynamics of the Ammonium Cations in (NH 4 ) 2 B 12 H 12

September 1, 2011
Author(s)
Kristina Verdal, Terrence J. Udovic, John J. Rush, Vitalie Stavila, Hui Wu, Wei Zhou, Timothy Jenkins
Low-temperature neutron scattering spectra of diammonium dodecahydro-closo-dodecaborate [(NH4)2B12H12] reveal two NH 4 + rotational tunneling peaks (e.g., 18.5 υeV and 37 υeV at 4 K), consistent with the tetrahedral symmetry and environment of the cations

Metal Amidoboranes

September 1, 2011
Author(s)
Hui Wu, Wei Zhou, Taner Yildirim
Metal amidoboranes, consisting of [NH 2BH 3]- anion and various metal cations, are a new class of compounds that have recently attracted great attentions due to their intriguing crystal structures and novel chemical and physical properties. Similar to

Modeling and Simulation of Healthcare Systems for Homeland Security Applications

September 1, 2011
Author(s)
Charles R. McLean, Yung-Tsun Lee, Sanjay Jain, Charles W. Hutchings
The purpose of this document is to provide a foundation for establishing a modeling and simulation technical interest group whose focus is information exchange on healthcare issues. The document defines an initial set of user/customer needs and system

Modeling and Simulation of Incident Management for Homeland Security Applications

September 1, 2011
Author(s)
Charles R. McLean, Yung-Tsun Lee, Sanjay Jain, Charles W. Hutchings
The purpose of this document is to provide: 1) a compendium of information pertaining to incident management modeling and simulation, and 2) a foundation for the establishment of a modeling and simulation technical interest group whose focus is information

On the electronic excited state dynamics of vibronic transitions. High resolution electronic spectra of acenaphthene and its argon van der Waals complex in the gas phase.

September 1, 2011
Author(s)
Leonardo Avarez-Valtierra, David F. Plusquellic, John T. Yi, David W. Pratt
Rotationally resolved fluorescence excitation spectroscopy has been used to study the dynamics, electronic distribution, and the relative orientation of the transition moment vector in several vibronic transitions of acenaphthene (ACN) and in its Ar van
Displaying 24451 - 24475 of 73930
Was this page helpful?