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Displaying 42851 - 42875 of 73779

What Do We Learn From the Local Geometry of Glass-Forming Liquids?

September 1, 2002
Author(s)
Francis W. Starr, Srikanth Sastry, Jack F. Douglas, S C. Glotzer
We examine the local geometry of a simulated glass-forming polymer melt. Using the Voronoi construction, we find that the distributions of Voronoi volume $P(v_V)$ and asphericity $P(a)$ appear to be universal properties of dense liquids, supporting the use

Wind and Seismic Effects: Proceedings of the 34th Joint Meeting

September 1, 2002
Author(s)
Stephen A. Cauffman
This publication is the proceedings of the 34th Joint Meeting of the US-Japan Panel on Wind and Seismic Effects. The meeting was held at the National Institute of Standards and Technology, Gaithersburg, Maryland, during 13-15 May 2002. The proceedings

Micro-Mirror Array Control of Optical Tweezer Trapping Beams

August 28, 2002
Author(s)
Nicholas Dagalakis, Thomas W. LeBrun, J Lippiatt
The efficiency of optical tweezer manufacturing depends on the number of trapping beams available. Micro optics technology offers the opportunity to significantly increase the number of trapping beams without a significant increase of the cost or size of

Modeling Ion Transport Mechanisms in Unsaturated Porous Media

August 27, 2002
Author(s)
J Marchand, E Samson, Kenneth A. Snyder, J J. Beaudoin
The transport of ions in colloids, granular and consolidated porous media is important to a wide variety of environmental and engineering problems. Typical examples are the transport of contaminants in marine sediments, the containment of hazardous waste

A Web3D Based CAESAR Viewer

August 26, 2002
Author(s)
Sanford P. Ressler, Qiming Wang
The CAESAR (Civilian American and European Surface Anthropometry Resource) project completed in 2002 has collected 3D scans of over 5000 subjects. We have created a 3D interface, the NIST CAESAR Viewer (NCV), utilizing the Virtual Reality Modeling Language

Effective Temperatures of a Driven System Near Jamming

August 26, 2002
Author(s)
I K. Ono, C S. O'Hern, Stephen A. Langer, A J. Liu, S R. Nagel, D J. Durian
Fluctuations in a model of a sheared, zero-temperature foam are studied numerically. Five different quantities that reduce to the true temperature in an equilibrium thermal system are calculated. All five have the same shear-rate dependence, and three have

4D/RCS Version 2.0: A Reference Model Architecture for Unmanned Vehicle Systems

August 22, 2002
Author(s)
James S. Albus, Hui-Min Huang, Elena R. Messina, Karl Murphy, Maris Juberts, Alberto Lacaze, Stephen B. Balakirsky, Michael O. Shneier, Tsai H. Hong, Harry A. Scott, Frederick M. Proctor, William P. Shackleford, John L. Michaloski, Albert J. Wavering, Thomas Kramer, Nicholas Dagalakis, William G. Rippey, Keith A. Stouffer, Steven Legowik
The 4D/RCS architecture provides a reference model for military unmanned vehicles on how their software components should be identified, organized, and interacting such that missions, especially those involving unknown or hostile environments, can be

Shielding Effectiveness Measurements Using the Direct Illumination Technique

August 20, 2002
Author(s)
Chriss A. Grosvenor, David R. Novotny, Robert T. Johnk, Seturnino Canales, Jason Veneman
In this paper we discuss the direct illumination and reverberation chamber techniques for measuring shielding effectiveness. using the reverberation chamber as our reference, we explain the differences between the measurements and corrections applied to

Situated Computing: The Next Frontier for HCI Research

August 20, 2002
Author(s)
Kevin L. Mills, Jean C. Scholtz
Today, much of our information-intensive work is carried out at desktop computer workstations; however, increasingly people work and live on the move. Very soon, scads of small information processing appliances will be carried along from place to place as

Pseudo-Isotropic Source for Anechoic Chamber Qualification

August 19, 2002
Author(s)
Perry F. Wilson, John M. Ladbury, Galen H. Koepke
A pseudo-isotropic source is presented. The source consists of an electrically-large cavity with internal excitation (horn antenna), a variable internal boundary condition (a rotating paddle as in a reverberation chamber), and randomly placed apertures for

Applications of Calibration Comparison in On-wafer Measurement

August 17, 2002
Author(s)
Uwe Arz, Dylan Williams
In this paper we discuss several applications of calibration comparison in on-wafer measurement. This technique can be understood as an abstraction of the well-known two-tier deembedding scheme used in test-fixture characterization. The applications

Characteristic Impedance Measurement of Planar Transmission Lines

August 17, 2002
Author(s)
Uwe Arz, Dylan Williams, Hartmut Grabinski
In this paper we investigate a simple, robust and general method to determine the characteristic impedance of planar transmission lines based on calibration comparison. We apply the method to different types of planar transmission lines like CPW and

New Techniques for Calibrating Across-the-Road Traffic Radars

August 17, 2002
Author(s)
Claude Weil, Dennis G. Camell, David R. Novotny, Robert T. Johnk, Arthur Ondrejka
We discuss simulator units for calibrating across-the-road Doppler traffic radars used in highway speed enforcement. Two units of essentially the same design were developed, one operating at K-Band (24 GHz) and the other at Ka-Band (35 GHz). The signal

Phantom Materials for Metal Detector Research

August 17, 2002
Author(s)
James R. Baker-Jarvis, Raian K. Kaiser, Michael D. Janezic
The purpose of this paper is to discuss the characterization of materials that mimic the electromagnetic characteristics of the human body from low frequencies to 10 MHz and over a temperature range of 15 C. to 40 C. The materials studied were: 1) a

Real-Time Studies of Strains at Ferroelectric Domain Walls under an Applied Field

August 17, 2002
Author(s)
Terrence J. Jach, S. Kim, S M. Durbin, J. A. Aust, David S. Bright
We report on an improved method of visualizing domains in congruent ferroelectric crystals such as LiNbO^d3 with Bragg x-ray topography. Using monochromatic synchrotron undulator radiation and a magnifying x-ray camera, we are able to image domains created
Displaying 42851 - 42875 of 73779
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