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Displaying 43176 - 43200 of 73818

Group Delay Description for Broadband Pulses

June 7, 2002
Author(s)
M J. Ware, S A. Glasgow, J Peatross
The traditional concept of group delay usually arises in connection with an expansion of the phase delay for an electromagnetic pulse. In this context, the group delay function (evaluated at a single 'carrier' frequency) describes the time required for a

Simulations of Noise-Parameter Uncertainties

June 7, 2002
Author(s)
James P. Randa
This paper reports results for uncertainties obtained using a Monte Carlo simulation of noise-parameter measurements. The simulator permits the computation of the dependence of the uncertainty in the noise parameters on uncertainties in the underlying

Vector Corrected Noise Temperature Measurements

June 7, 2002
Author(s)
Mark H. Weatherspoon, Lawrence P. Dunleavy, Ali Boudiaf, James P. Randa
A new one-port noise temperature measurement technique is presented that uses receiver noise parameters for error correction. Improved accuracy in one-port noise temperature measurements made with commercial systems is demonstrated without using isolators

Repeat Measurements and Metrics for Nonlinear Model Development

June 6, 2002
Author(s)
Catherine A. Remley, Jeffrey A. Jargon, Dominique Schreurs, Donald C. DeGroot, Kuldip Gupta
We develop a method for using metrics in conjunction with repeat measurements to study nonlinear models. We illustrate this procedure by investigating the performance of three types of measurement-based nonlinear circuit models using two different metrics.

Measuring Clock Jitter at 100 GHz from PM Noise Measurements

June 3, 2002
Author(s)
David A. Howe
"Jitter" is the noise modulation due to random time shifts on an otherwise ideal, or perfectly on-time, signal transition. This paper presents ways of calculating timing jitter using phase- modulation (PM) and amplitude-modulation (AM) noise measurements

A 10T Mohm Per Step Hamon Transfer Standard

June 1, 2002
Author(s)
Dean G. Jarrett
To evaluate high resistance measurements and scaling in the range 1 Tohm to 100 Tohm, a 10 Tohm per step Hamon transfer standard is being developed. The design uses fabrication techniques developed in recent years at NIST to construct high resistance

A Critical Evaluation of Interlaboratory Data on Total, Elemental, and Isotopic Carbon in the Carbonaceous Particle Reference Material, NIST SRM 1649a

June 1, 2002
Author(s)
Lloyd A. Currie, Bruce A. Benner Jr, H A. Cachier, R Cary, J C. Chow, David L. Urban, T. I. Eglinton, O Gustafsson, P C. Hartmann, J I. Hedges, J D. Kessler, T Kirchstetter, D Klinedinst, George A. Klouda, J V. Marolf, C A. Masiello, T Novakov, A. Pearson, K M. Prentice, H Puxbaum, J G. Quinn, C. M. Reddy, H Schmid, J F. Slater, Stephen A. Wise, J Watson
A primary purpose of this report is to provide documentation for the new isotopic and chemical particulate carbon data for certified, reference and information values in Tables 12 and 13 of the Certificate of Analysis. Supporting this is a critical review

A Decomposition-Based Approach to Layered Manufacturing

June 1, 2002
Author(s)
I Llinkin, R Janardan, J J. Majhi, J Schwerdt, Miles E. Smid, Ram D. Sriram
This paper introduces a new approach for improving the performance and versatility of Layered Manufacturing (LM), which is an emerging technology that makes it possible to build physical prototypes of 3D parts directly from their computer models using a

A High-Energy X-Ray Spectrometer Diagnostic for the OMEGA Laser

June 1, 2002
Author(s)
Lawrence T. Hudson, Albert Henins, R Deslattes, J Seely, G Holland, R Atkin, L Marlin, D D. Meyerhofer, C Stoeckl
A new x-ray diagnostic has been commissioned recently at the OMEGA laser facility at the University of Rochester. It is a transmission curved crystal spectrometer designed primarily to characterize the hot-electron energy distribution of laser generated

A Microshear Test to Measure Bond Strengths of Dentin-Polymer Interfaces

June 1, 2002
Author(s)
Walter G. McDonough, Joseph M. Antonucci, J He, Y Shimada, Martin Y. Chiang, Gary E. Schumacher, Carl R. Schultesiz
Mechanical property tests such as the diametral tensile, uniaxial tensile and transverse strength tests are commonly used in studying the interfacial properties of the bond between dental composites and dental substrates such as dentin and enamel. These

A New Usability Standard and What It Means to You

June 1, 2002
Author(s)
Jean C. Scholtz, Emile L. Morse
The Common Industry Format (CIF) was approved on December 12, 2001 as an ANSII standard (ANSI/NCITS-354-2001). The CIF is a deliverable from the Industry USability Reporting (IUSR) Project begun in 1997, facilitated by the National Institute of Standards

About Substitution for Ozone-Depleting Agents for Fire Extinguishing

June 1, 2002
Author(s)
A N. Baratov, N P. Kopylov, E V. Timofeev
New ozone-friendly fire extinguishing mixtures based on iodinated halons are proposed in the present paper. They act on a flame both chemical inhibitor and diluent. It was obtained that mixture CF3H+CH3I has value of minimum fire extinguishing

Advances in Weld Hydrogen Sensors

June 1, 2002
Author(s)
David Olson, B. Mishra, R D. Smith, S. Niyomsoan, P. Termsuksawad, Y D. Park, V I. Kaydanov, Z Gavra, Ronald B. Goldfarb
Through the application of modern physics concepts, advanced hydrogen sensors are being developed for rapid determination of weld hydrogen content and distribution. Electronic, optical, and magnetic property measurements have demonstrated the ability to

An AC Josephson Source for Johnson Noise Thermometry

June 1, 2002
Author(s)
Samuel Benz, John M. Martinis, Paul Dresselhaus, Sae Woo Nam
We have adapted the Josephson arbitrary waveform synthesizer to create a quantized voltage source suitable for calibrating the cross-correlation electronics of a Johnson noise thermometer system. The requirements of long term stability and low voltage

An Improved Sensor for the NIST Cryogenic Thermal Transfer Standard

June 1, 2002
Author(s)
Thomas E. Lipe Jr., Carl D. Reintsema, Joseph R. Kinard Jr.
We are developing a new primary standard of ac-dc difference, based on a resistive superconducting transition-edge sensor. We describe the performance limitations of the present device, and present a new sensor design which will improve the operating

An Updated Set of Basic Linear Algebra Subprograms (BLAS)

June 1, 2002
Author(s)
L S. Blackford, Roldan Pozo, Et al
This paper updates the ongoing BLAS effort, and summarizes what types of operations are now available. We now have flavors of BLAS for dense, banded, and sparse vector and matrix operations. Some BLAS are also supported in extended and mixed precision
Displaying 43176 - 43200 of 73818
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