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Displaying 43001 - 43025 of 73930

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

Remote, Near-Field Measurement of Large Antennas

August 17, 2002
Author(s)
Ronald C. Wittmann, Michael H. Francis
It is difficult to characterize many antenna systems in a laboratory environment. Size is the major consideration, but an increasing number of sophisticated antennas are being placed at remote sites where they are simply inaccessible. Of particular concern

Polymer Layered-Silicate Nanocomposites from Thermally Stable Trialkyl-Imidazolium Treated Montmorillonite

August 16, 2002
Author(s)
Jeffrey W. Gilman, W H. Awad, Rick D. Davis, Cher H. Davis, John R. Shields, T E. Sutto, Richard H. Harris Jr., A B. Morgan, J H. Callahan, Paul C. Trulove, Hugh C. De Long
The limited thermal stability of alkyl ammonium cations and the processing instability of some polymers (polyamide-6 (PA-6) and polystyrene (PS)) in the presence of nanodispersed montmorillonite (MMT) has motivated the development of improved organophillic

A Simulation Framework for Evaluating Mobile Robots

August 15, 2002
Author(s)
Stephen B. Balakirsky, Elena R. Messina
As robotic technologies mature, we are moving from simple systems that roam our laboratories to heterogeneous groups of systems that operate in complex non-structured environments. The novel and extremely complex nature of these autonomous systems

Evaluating the Performance of a Vehicle Pose Measurement System

August 15, 2002
Author(s)
Harry A. Scott, Sandor S. Szabo
A method is presented for measuring the uncertainty of a vehicle pose measurement system (e.g., GPS, inertial sensors, etc.). The method supports evaluations of a system on a vehicle moving at high speeds. An example is provided to illustrate the method.

Metrics and Performance Measures for Intelligent Unmanned Ground Vehicles

August 15, 2002
Author(s)
James S. Albus
Metrics and measures for physical phenomena are precisely defined and widely accepted. However, metrics and measures for intelligent systems are as yet vaguely defined and controversial. Even the definition of intelligence is not widely agreed upon. A

Mobile Robot Pose Tracking for Performance Analysis

August 15, 2002
Author(s)
Alan M. Lytle, Kamel S. Saidi, William C. Stone, Michael O. Shneier
The NIST Construction Metrology and Automation Group (CMAG), in cooperation with the NIST Intelligent Systems Division (ISD), is researching robotic structural steel placement as part of a project to develop an Automated Steel Construction Testbed (ASCT)

10 fs Pulses With Carrier-Envelope Phase Coherence

August 1, 2002
Author(s)
T M. Fortier, D J. Jones, Jun Ye, S T. Cundiff, R S. Windeler
The carrier-envelope phase of the pulse train emitted by a 10-fs mode-locked laser has been stabilized such that carrier-envelope phase coherence is maintained for a least 150 s (measurement limited). The phase coherence time was measured independent of
Displaying 43001 - 43025 of 73930
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