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 30876 - 30900 of 74220

Toward Quantitative Fluorescence Measurements with Multicolor Flow Cytometry

December 28, 2007
Author(s)
Lili Wang, Adolfas Gaigalas, Gerald Marti, Fatima Abbasi, Robert A. Hoffman
A procedure is presented for calibrating the output of a multicolor flow cytometer in units of antibodies bound per cell (ABC). The procedure involves two steps. First, each of the fluorescence channels of the flow cytometer is calibrated using Ultra

Terahertz Spectroscopy of Biomolecules

December 22, 2007
Author(s)
David F. Plusquellic, Edwin J. Heilweil
Far-infrared (Terahertz or THz) spectroscopic investigations of condensed-phase biological and model organic species including substituted benzenes, amino acids, sugars, polypeptides, small proteins and DNA/RNA are reviewed. These studies reveal that for

'Ballistic' vs. 'Diffusive' Transport in Current-Induced Magnetization Switching

December 21, 2007
Author(s)
N Theodoropoulou, Abhishek Sharma, W Pratt, J. Bass, Mark D. Stiles, J Xiao
We test whether current-induced magnetization switching due to spin-transfer-torque in ferromagnetic/non-magnetic/ferromagnetic (F/N/F) trilayers changes significantly when scattering within the N-metal layers is changed from ballistic to diffusive. Here

NCWM PUB 15, Interim Meeting Agenda - January 2007

December 19, 2007
Author(s)
T Coleman, Steven E. Cook, Linda D. Crown, Ralph A. Richter, L T. Sebring, R C. Suiter, Juana S. Williams
This is the agenda for the four Standing Committees of the National Conference on Weights and Measures. This meeting will be held at the the Omni Jacksonville, Jacksonville, FL, on January 21 - 24, 2007.

Securing External Computers and Other Devices Used by Teleworkers

December 19, 2007
Author(s)
Shirley M. Radack
This bulletin summarizes the recommendations developed by NIST to help workers secure their external devices that they need for teleworking. The bulletin covers background information on telework technologies and the security issues related to the use of

Ultrafast Dynamics of Model Molecular Photoswitches in Solid Phase

December 18, 2007
Author(s)
Tung T. To, Edwin J. Heilweil
Ultraviolet pump, infrared probe transient absorption studies of the chelatable compound 1, [Mn{?5-C5H4C(O)(SCH3)3}(CO)3], dispersed in room temperature, ~25 m thick polyacryclonitrile (PAN) films are reported for the first time. Irradiation of 1 at 289 nm

Air-Side Velocity Distribution in Finned-Tube Heat Exchangers

December 17, 2007
Author(s)
David A. Yashar, Hong H. Cho
The performance of finned tube heat exchangers is greatly affected by the distribution of the air that passes through it. The air side velocity distribution is largely left unknown because it is difficult to measure accurately. In this study, we examined

Biocompatibility of atomic layer deposited alumina thin films

December 17, 2007
Author(s)
Dudley Finch, Tammy L. Oreskovic, Krishna Ramadurai, Cari F. Herrmann, Steven George, Roop L. Mahajan
Presented in this paper is a study of the biocompatibility of a hydrophilic alumina thin film and a hydrophobic variation deposited on standard glass cover slips using atomic layer deposition (ALD) techniques. The pure alumina ALD coating exhibits a water

Imaging the interface of epitaxial graphene with silicon carbide via scanning tunneling microscopy

December 14, 2007
Author(s)
Gregory M. Rutter, N Guisinger, Jason Crain, Emily Jarvis, Mark D. Stiles, T Li, P First, Joseph A. Stroscio
The potential for electronics based on graphene, a single layer of sp2-bonded carbon atoms, rests on the ability to fabricate graphene into useful devices. Graphene grown epitaxially on SiC substrates offers an avenue for carbon-based electronics allowing

Nano- and Atomic-Scale Length Metrology

December 14, 2007
Author(s)
Theodore V. Vorburger, Ronald G. Dixson, Joseph Fu, Ndubuisi G. Orji, Shaw C. Feng, Michael W. Cresswell, Richard A. Allen, William F. Guthrie, Wei Chu

Do Plastic Zones Form at Crack Tips in Silicate Glasses?

December 13, 2007
Author(s)
Jose Lopez-Cepero, Sheldon M. Wiederhorn, Theo Fett, Jean-Pierre Guin
In a number of recent studies, the claim has been made that silicate glasses fracture by the formation, growth and coalescence of cavities, in the same way that metals do but at a much smaller scale. Evidence for cavity formation comes from the examination

Submicrometer photoresponse mapping of nanowire superconducting single-photon detectors

December 13, 2007
Author(s)
Robert Hadfield, Paul A. Dalgarno, John A. O'Connor, Euan Ramsay, Richard Warburton, Eric Gansen, Burm Baek, Martin Stevens, Richard Mirin, Sae Woo Nam
We report on the photoresponse mapping of nanowire superconducting single-photon detectors using a focal spot significantly smaller than the device area (10X10 υ 2). Using a confocal microscope configuration and solid immersion lens, we achieve a spot size

Improved Method for Calibrating a Stokes Polarimeter

December 10, 2007
Author(s)
Bruno Boulbry, J C. Ramella-Roman, Thomas A. Germer
We present a method for calibrating polarimeters that uses a set of well-characterized reference polarizations and makes no assumptions about the optics contained in the polarimeter other than their linearity. The method requires that a matrix be
Displaying 30876 - 30900 of 74220