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Displaying 42576 - 42600 of 73461

Cell Membrane Hybrid Bilayers Containing the G-Protein-Coupled Receptor CCR5

August 1, 2002
Author(s)
N M. Rao, Vitalii I. Silin, K D. Ridge, John T. Woodward IV, Anne L. Plant
A hybrid bilayer membrane is a planar model membrane that is formed at an alkanethiol monolayer-coated gold surface by the spontaneous reorganization of phospholipid vesicles. Membrane vesicles from monkey kidney COS-cells also reorganize at an alkanethiol

Concealed Weapons Detection using an Uncooled Millimeter-wave Microbolometer System

August 1, 2002
Author(s)
Erich N. Grossman, V. A. Bhupathiraju, Aaron J. Miller, Carl D. Reintsema
We describe the status of, and present the first imagery obtained using, an active uncooled mm-wave microbolometer-based imaging system. The microbolometers consist of 2 mm x 6 mm x .02 mm Nb films, coupled to the incident field by annular slot antennas

Detection Limit of Isotope Dilution Mass Spectrometry

August 1, 2002
Author(s)
Lee L. Yu, John D. Fassett, William F. Guthrie
The detection limit is an important figure of merit for evaluating instrumentation and analytical methods. While the detection limit for techniques using linear calibration functions has been studied extensively, this fundamental metric has rarely been

Development of a Tunable LED-Based Colorimetric Source

August 1, 2002
Author(s)
Steven W. Brown, C Santana, George P. Eppeldauer
A novel, spectrally tunable light-source utilizing light emitting diodes (LED's) for radiometric, photometric, and colorimetric applications is described. The tunable source can simulate standard sources and can be used as a transfer sources and can be

Diffractive Optics From Self-Assembled DNA

August 1, 2002
Author(s)
Zachary H. Levine
An algorithm is presented for assembling tiles into a variable spaced grating, the one-dimensional analogue of Fresnel zone plate. The algorithm supports blazing. The x-ray properties of such a grating, assumed to be constructed form DNA are estimated

Document Reverse Engineering: From Paper to XML

August 1, 2002
Author(s)
K H. Lee, Y C. Choy, S B. Cho, Xiao Tang, V R. McCrary
With the widespread of XML documents on the Web, there is a growing interest in transforming paper-based documents into XML representations. In this paper, we present a syntactic method for logical structure analysis of documents with multiple pages and

Electrophoretic Capture of Circular DNA in Gels - A Review

August 1, 2002
Author(s)
B. Akerman, Kenneth D. Cole
Results on electrophoretic capture of circular DNA in porous gels are reviewed. Processes, which cause arrest of circular forms of DNA during electrophoresis, can provide a very efficient separation mechanism for the purification of plasmids and bacterial

Establishment of Ballistics Measurement Traceability Using NIST RM 8240 Standard Bullets

August 1, 2002
Author(s)
Jun-Feng Song, Theodore V. Vorburger, Robert A. Clary, Eric P. Whitenton
The NIST RM (Reference Material) 8240 standard bullets are being developed to support the traceability of ballistics measurements nationwide. Six master bullets from ATF and FBI are measured at NIST using a stylus measurement system. The resulting set of

Failure Analysis of the WWVB Tower

August 1, 2002
Author(s)
Joseph D. McColskey, Christopher N. McCowan, Raymond L. Santoyo
A failure analysis was conducted on the collapse of the NIST WWVB tower. The analysis included mechanical testing, chemical analysis, and metallographic examination of the failed part. We ascertained that the underlying reason for the collapse was fatigue

First Principles Studies of KnbO 3 , KtaO 3 and LiTaO 3 Solid Solutions

August 1, 2002
Author(s)
S A. Prosandeev, Eric J. Cockayne, Benjamin P. Burton
KTaO3-based solid solutions exhibit a variety of interesting physical phenomena. To better understand these phenomena, we performed first-principles calculations on [K1-x,Lix]TaO3 (KLT) and K[Ta1-xNbx]O3 (KTN) supercells. Our results show Li displacements
Displaying 42576 - 42600 of 73461
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