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Displaying 43651 - 43675 of 73778

Architectures in an XML World

February 1, 2002
Author(s)
Joshua Lubell
Extensible Markup Language (XML) developers have at their disposal a variety of tools for achieving schema reuse. An often-overlooked reuse method is the specification of architectures for creating and processing data. Experience with APEX, an architecture

Cell and DNA Standards for Medical Genetics Laboratories

February 1, 2002
Author(s)
Peter E. Barker
Standards have played a role in establishing human cytogenetic analysis as a clinical laboratory discipline from the beginning. Following implementation of basic cytogenetic techniques and discoveries of chromosomal disorders, scientific necessity inspired

Chemical Science and Technology Laboratory FY 2001

February 1, 2002
Author(s)
Hratch G. Semerjian, W Koch, Ellyn S. Beary
This report summarizes the research and services provided by the Chemical Science and Technology Laboratory of the National Institute of Standards and Technology for Fiscal Year 2001. The report includes: a general overview of the laboratory's activities

Chlorella Virus Pyrimidine Dimer Glycosylase Excises Ultraviolet Radiation- and Hydroxyl Radical-Induced Products 4,6-Diamino-5-Formamidopyrimidine and 2,6-Diamino-4-Hydroxy-5-Formamidopyrimidine from DNA

February 1, 2002
Author(s)
Pawel Jaruga, R Jabil, Amanda K. McCullough, H Rodriguez, M Miral Dizdar, R S. Lloyd
A DNA glycosylase specific for UV radiation-induced pyrimidine dimers has been identified from chlorella virus Paramecium bursaria chlorella virus-1. This enzyme (Chlorella virus Pyrimidine dimer glycosylase [cv-pdgl) exhibits a 41% amino acid identity

Combinatorial Assay of Cells on Topographically Patterned Surfaces

February 1, 2002
Author(s)
S L. Kennedy, N Washburn, A Sehgal, Alamgir Karim, Eric J. Amis
It has been well established that cell substrate topography can affect cell morphology and cell behavior. Numerous groups have demonstrated that cell alignment, anisotropic cell spreading and cell proliferation can be controlled by various topographical

Comparison of Two Code Scalability Tests

February 1, 2002
Author(s)
Gordon E. Lyon
When a computer system is expensive to use or is not often available, one may want to tune software for it via analytical models that run on more common, less costly machines. In contrast, if the host system is readily available, the attraction of

Consequence of Superfluidity on the Expansion of a Rotating Bose-Einstein Condensate

February 1, 2002
Author(s)
Mark A. Edwards, Charles W. Clark, P Pedri, L Pitaevskii, S Stringari
By solving the hydrodynamic equations of irrotational superfluids we investigate the time evolution of a rotating condensate expanding after the sudden release of the confining trap. If the condensate is initially rotating slowly its angular velocity is

Controlling Morphology During Pattern Development in Thin Film Photoresists

February 1, 2002
Author(s)
Ronald L. Jones, Eric K. Lin, Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, Christopher L. Soles, Wen-Li Wu
We report on attempts to control surface morphology using current lithographic processes critical to the development of both inorganic and organic nano-structures. Bilayers of protected (base insoluble) and deprotected (base soluble) model lithographic

Data Analysis Methods for Synthetic Polymer Mass Spectrometry: Autocorrelation

February 1, 2002
Author(s)
William E. Wallace, Charles M. Guttman
Autocorrelation is shown to be useful in describing the periodic patterns found in high-resolution mass spectra of synthetic polymers. Examples of this usefulness are described for a simple linear homopolymer to demonstrate the method fundamentals, a

Dendrimer-Star Polymers: Sub-Micrometer Probe Molecules

February 1, 2002
Author(s)
R C. Hedden, Barry J. Bauer, Eric J. Amis
Dendrimers are highly branched polymers prepared by alternating addition of monomers to a multifunctional core, resulting in a layered, treelike structure. Grafting monofunctional linear polymers (arms) onto dendrimer endgroups results in hybrid copolymers

Determination of Planck Mean Absorption Coefficients for HBr, HCl, and HF

February 1, 2002
Author(s)
Stephen P. Fuss, Anthony P. Hamins
The Planck mean absorption coefficient has been calculated for HBr HCl, and HF over a temperature range from 300 K-2300 K using data from the 1996 edition of the HITRAN molecular database. Plots of ap versus temperature showed monotonically decreasing

Development of a Diffusion Mobility Database for Ni-Base Superalloys

February 1, 2002
Author(s)
Carelyn E. Campbell, William J. Boettinger, Ursula R. Kattner
For a wide variety of Ni-base superalloy applications, including solidification, homogenization, y precipitation, bonding and repairing processes, and protective bond coats, multicomponent diffusion data are needed. Thus, in the Ni-Al-Co-Cr-Hf-Mo-Re-Ta-Ti

Development of a Reliability-Based Method of Service Life Prediction for Sealant

February 1, 2002
Author(s)
Christopher C. White, C Buch, Mark R. VanLandingham
Standard test methods, such as ASTM C719, evaluate sealant performance though threshold test measurements. This method and its derivatives do not offer reliable predictions of in-service performance. This article will detail efforts to move away from the

E-Concrete? Believe It!

February 1, 2002
Author(s)
G J. Frohnsdorff, Edward J. Garboczi
In recent years, the complexity of concrete mixture proportioning has increased dramatically. New chemical admixtures, such as high-performance superplasticizers and shrinkage-reducing admixtures, have been introduced into the marketplace. Due to both

Effects of Crosslink Density on Surface and Interface Properties of Amine-Cured Epoxy

February 1, 2002
Author(s)
Xiaohong Gu, Tinh Nguyen, Mark R. VanLandingham, D T. Raghavan
The effect of network changes on the surface and interface properties of amine-cured epoxy has been investigated. Samples of different crosslinked epoxies are prepared by mixing stoichiometrically pure diglycidyl ether of bisphenol A (n=0.03) with
Displaying 43651 - 43675 of 73778
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