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Displaying 42901 - 42925 of 73779

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

Grain Growth in Relaxor Ferroelectrics

August 1, 2002
Author(s)
J Blendell, Jay S. Wallace
The mechanisms controlling normal and exaggerated grain growth in lead magnesium niobate - lead titanate (PMN - PT) ceramics have been investigated by varying the PbO-based liquid phase volume fraction, the PT content and the MgO stoichiometry. There is a

Haptics in Virtual Nanoscale Assembly

August 1, 2002
Author(s)
Kevin W. Lyons, Yung-Tsun Lee
Assembly operations at the nanometer scale differ from the conventional scale (greater than millimeter)assembly operations in two important aspects. Firstly, the continuium assumption in the assembly components does not apply. We clearly have to account

High-Resolution Crystal Structures of Erythrina Cristagalli Lectin in Complex With Lactose and 2'-a-L-Fucosyllactose and Correlation With Thermodynamic Binding Data

August 1, 2002
Author(s)
C Svensson, S Teneberg, C L. Nilsson, A Kjellberg, Frederick P. Schwarz, N Sharon, U Krengel
The primary sequence of Erythrina cristagalli lectin (ECL) was mapped by mass spectrometry, and the crystal structures of the lectin in complex with lactose and 2'-α-L-fucosyllactose were determined at 1.6 and 1.7 resolution, respectively. The two

HIV Protease Structural Database

August 1, 2002
Author(s)
Veerasamy Ravichandran, J Vondrasek, G L. Gilliland, Talapady N. Bhat, A Wlodawer
The HIV Protease Database (HIVdb) is a web-based archive for HIV protease structural information. HIVdb contains experimentally determined three-dimensional structures of human immunodeficiency virus type 1 (HIV-1), human immunodeficiency virus type 2 (HIV
Displaying 42901 - 42925 of 73779
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