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Displaying 5926 - 5950 of 7113

How the User can Improve Fingerprint Image Quality

May 12, 2008
Author(s)
Mary F. Theofanos, Ross J. Micheals, Shahram Orandi, Brian C. Stanton, Nien F. Zhang
Traditionally the biometric field has viewed the user as a passive source of the biometric sample rather than an interactive component of the biometric system. But fingerprint image quality is highly dependent on the human computer interaction and

Impact of Signaling Load on the UMTS Call Blocking/Dropping

May 11, 2008
Author(s)
Yi Qian, David Tipper, Saowaphak Sasanus
Radio resources in the third generation (3G) wireless cellular networks (WCNs) such as the universal mobile telecommunications system (UMTS) network is limited in term of soft capacity. The quality of a signaling service transmission depends on various

A Virtual Rapid Chloride Permeability Test

July 15, 2007
Author(s)
Dale P. Bentz
The rapid chloride permeability test (RCPT), as it is commonly called, has been in existence for over 20 years and was standardized by ASTM over 15 years ago. The test is used extensively in the concrete industry for assessing concrete quality and is now

FIRE SUPPRESSANT DISTRIBUTION IN AN ENGINE NACELLE

January 1, 2006
Author(s)
David R. Keyser, J C. Hewson
The flow inside an engine nacelle ground test simulator is studied for the purpose of understanding and optimizing the distribution of suppressant. One objective of this study is to identify conditions for which suppression will and will not be successful

Camera Calibration for a Manufacturing Inspection Workstation

January 31, 2005
Author(s)
Tsung-Ming Tsai
A CCD camera mounted on a manufacturing part inspection workstation is calibrated for measuring 3D part geometry. It is calibrated by using computer algorithms to analyze data collected from a specially designed calibration image pattern. The calibration

A Four-Terminal Current Shunt with Calculable AC Response

August 30, 2004
Author(s)
Owen B. Laug, T. M. Souders, Bryan C. Waltrip
The design of a 0.1 Ohm, four-terminal current shunt with calculable frequency dependence up to 1 MHz is described. It is intended for use as a standard for current measurements up to 10 A rms with the primary purpose of being able to tie alternating

A Time-Domain SQUID multiplexer for readout of x-ray microcalorimeter arrays

January 1, 2004
Author(s)
W.Bertrand (Randy) Doriese, Jonathan Beall, Joern Beyer, Steven Deiker, S. L. Ferreira, Gene C. Hilton, Kent D. Irwin, John M. Martinis, Sae Woo Nam, Carl D. Reintsema, Joel Ullom, Leila R. Vale
SQUID multiplexers are being developed at NIST for the readout of large arrays of transition-edge-sensor (TES) detectors. Applications for these arrays include x-ray materials analysis on a scanning-electron microscope and astronomical cameras for x-ray

Traction-Free Vibrations of Finite Trigonal Elastic Cylinders

April 1, 2003
Author(s)
Paul R. Heyliger, Ward L. Johnson
The unrestrained, traction-free vibrations of finite elastic cylinders with trigonal material symmetry are studied using two approaches, based on the Ritz method, which formulate the weak form of the equations of motion in cylindrical and retangular

Cryptographic Standards and Guidance: A Status Report

September 1, 2002
Author(s)
Elaine B. Barker
A comprehensive toolkit of cryptographic standards and associated guideline that covers a wide range of cryptographic technology is currently under development by the Computer Security Division at NIST. These standards and guidelines will enable U.S

Evaluating Building Integrated Photovoltaic Performance Models

May 1, 2002
Author(s)
Arthur H. Fanney, Brian P. Dougherty, Mark W. Davis
Predictive performance tools could accelerate the implementation of integrated photovoltaics (BIPV. The National Institute of Standards and Technology (NIST) seeks to improve and validate previously developed computer simulation tools with experimental

A Knowledge-Navigation System for Dimensional Metrology

April 1, 2002
Author(s)
Howard T. Moncarz
Geometric dimensioning and tolerancing (GD&T) is a method, based on dimensional metrology, to specify a part so that it will meet its design intent. GD&T is difficult to master for two main reasons. First, it is based on complex 3D geometric entities and

The Visible Cement Data Set

March 1, 2002
Author(s)
Dale P. Bentz, S Mizell, Steven G. Satterfield, J E. Devaney, William L. George, Peter M. Ketcham, James R. Graham, J E. Porterfield, Daniel A. Quenard, F A. Vallee, H Sallee, E Boller, J Baruchel
With advances in X-ray microtomography, it is now possible to obtain three-dimensional representations of a material's microstructure with a voxel size of less then one micrometer. The Visible Cement Data Set represents a collection of 3-D data sets

Design of an Active MM-Wave Concealed Object Imaging System

August 1, 2001
Author(s)
Nicholas Paulter, Erich N. Grossman, Gerard N. Stenbakken, Bryan C. Waltrip, Shalva Nolen, Carl D. Reintsema
The research and design of an active millimeter-wave concealed object imaging system is described. Several illumination and detection methods were analyzed via computer simulation to assess the effects of system parameters on the signal-to-noise ratio of

Agent-Based Services for B2B Electronic Commerce

December 1, 2000
Author(s)
Elizabeth N. Fong, Nenad Ivezic, Thomas R. Rhodes, Y Peng
… technology and the feasibility of applying agent-based computing to b2b e-commerce in the circuit board …
Displaying 5926 - 5950 of 7113
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