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Displaying 43776 - 43800 of 73929

Random Packings of Frictionless Particles

February 18, 2002
Author(s)
C S. O'Hern, Stephen A. Langer, A J. Liu, S R. Nagel
We study random packings of frictionless particles at T=0. The packing fraction where the pressure becomes nonzero is the same as the jamming threshold, where the static shear modulus becomes nonzero. The distribution of threshold packing fractions narrows

Surface Characterization of Laser- Ablated Polymers Used for Microfluidics

February 15, 2002
Author(s)
D L. Pugmire, E A. Waddell, R Haasch, Michael J. Tarlov, Laurie E. Locascio
Fabrication of microfluidic devices by excimer laser ablation under different atmospheres may provide variations in polymer microchannel surface characteristics. The surface chemistry and electroosmotic (EO) mobility of polymer microchannels laser ablated

Handbook of Reference Data for Nondestructive Testing: Ultrasonics Chapter

February 14, 2002
Author(s)
John A. Slotwinski
The ASTM Handbook of Reference Data for Nondestructive Testing (NDT) is a collection of previously available NDT data for use by NDT practitioners. It is intended to be a ready reference guide, and will include chapters on several of the different NDT

Powder Standard Reference Materials

February 13, 2002
Author(s)
James F. Kelly
The measurement of particle size distributions has become increasingly important for the testing and certification of equipment used in size analysis. Requirements for quality control compliance with the ISO 9000 series of quality standards have emphasized

Total-Energy-Based Structure Prediction for Decagonal Al-Ni-Co

February 11, 2002
Author(s)
M Mihalkovic, I Al-Lehyani, Eric J. Cockayne, C L. Henley, N Moghadam, J A. Moriarty, Yijun Wang, M Widom
Quasicrystals are metal alloys whose noncrystallographic symmetry and lack of structural periodicity challenge methods of both experimental structure determination and theoretical structural prediction. Here we employ total energy calculations and Monte

Development of a Minimal IEEE 1451.1 Model for Microcontroller Implementation

February 7, 2002
Author(s)
A Stepanenko, Kang B. Lee, R Kochan, V Kochan, A Sachenko
The IEEE 1451.1 standard was studied and analyzed for resources needed for a minimal implementation of the standard. As a result, a Minimal IEEE 1451.1 Model optimized for the 8051 series of microcontrollers is proposed. In addition, a Minimal IEEE 1451.1

Improved Thermal Stability Of Crown Ether And Imidazolium Treatments for Flame Retardant Polymer Layered-Silicate Nanocomposites

February 6, 2002
Author(s)
Jeffrey W. Gilman, Cher H. Davis, Rick D. Davis, W H. Awad, A B. Morgan, Paul C. Trulove, Hugh C. De Long, T E. Sutto, L J. Mathias, D Schiraldi
The thermal stability of the organic treatment present on a layered silicate is of utmost importance in preparing a polymer-layered silicate (clay) nanocomposite by melt processing methods. Specifically, the organic treatment must not decompose at

A Functional Basis for Engineering Design: Reconciling and Evolving Previous Efforts

February 1, 2002
Author(s)
Kristen L. Wood, RJ B. Stone, DRJ Mcadams, J Hirtz, Simon Szykman
In engineering design, all products and artifacts have some intended reason behind their existence: the product or artifact function. Functional modeling provides an abstract, yet direct, method for understanding and representing an overall product or

Analysis of Electrically-Short Dipoles with a Nonlinear Load, Revisited

February 1, 2002
Author(s)
John M. Ladbury, Dennis G. Camell
We reexamine the characteristics of electrically short dipoles with nonlinear loads and, specifically, the early work of Motohisa Kanda. Although this problem has been examined in great detail in the past, some errors have not been addressed. We describe

Applications of Computational Thermodynamics

February 1, 2002
Author(s)
J Agren, F H. Hayes, LFJ H. Hoglund, Ursula R. Kattner, B Legendre, R Schmid-fetzer
The major tools used in applying computational thermodynamics to various problems in materials science are briefly presented and several practical examples are given as illustrations. Solutions to industrial problems pertaining to the processing of and

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
Displaying 43776 - 43800 of 73929
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