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Displaying 32351 - 32375 of 73830

Comparison of Predicted to Measured Module Performance.

June 27, 2007
Author(s)
Arthur H. Fanney, Brian P. Dougherty, Mark W. Davis
Computer simulation models to accurately predict the electrical performance of photovoltaic modules are essential. Without such models, potential purchasers of photovoltaic systems have insufficient information to judge the relative merits and cost

Detection of C 8 H - and Comparison With C 8 H Toward IRC+10216 With the Green Bank Telescope

June 27, 2007
Author(s)
A Remijan, J M. Hollis, Francis J. Lovas, M A. Cordiner, J Millar, A J. Markwick-Kemper, P R. Jewell
We report the detection of new transitions of octatetraynyl(C8H) toward the circumstellar envelopeIRC+10216 using data taken with the RobertC.Byrd 100m Green Bank Telescope(GBT). In addition, we report 5 transitions from Ku-, K- and Q-band that have been

Effects of Scanner Height on Fingerprint Capture

June 27, 2007
Author(s)
Mary Theofanos, Shahram Orandi, Ross J. Micheals, Brian Stanton, Nien F. Zhang
Although there is widespread deployment of biometric technologies such as fingerprint systems, little attention is being paid to the human-computer interaction that such technologies involved. This report presents the results of a study that examined the

Forensic Techniques for Cell Phones

June 27, 2007
Author(s)
Shirley M. Radack
The data that is captured on mobile phones can be a source of valuable information to organizations that are investigating crimes, policy violations and other security incidents. The science of recovering digital evidence from mobile phones, using

Infrared Spectra of CICN + , CINC + , and BrCN + Trapped in Solid Neon

June 27, 2007
Author(s)
Marilyn E. Jacox, Warren E. Thompson
When a mixture of ClCN or BrCN with a large excess of neon is codeposited at 4.3 K with a beam of neon atoms that have been excited in a microwave discharge, the infrared spectrum of the resulting solid includes prominent absorptions of the uncharged

Domain Ordering of Strained 5ML SrTiO 3 Films on Si(001)

June 26, 2007
Author(s)
P Ryan, Joseph Woicik, D Wermeille, J.-W Kim, C S. Hellberg, H Li
We present high resolution X-ray diffraction data indicating regularly ordered square shaped coherent domains approximately 1200A in length co-existing with longer approximately 9500A correlated regions in a highly strained 5ML SrTiO3 (STO) film grown on

A Call Admission Control Algorithm for WLAN in Heterogeneous Wireless Networks

June 25, 2007
Author(s)
SuKyoung Lee, David W. Griffith, Kyungsoo Kim, Nada T. Golmie
One major challenge in the integration of wireless LAN (WLAN) and cellular networks is call admission control (CAC). Without a suitable CAC mechanism for the integrated network, the two networking systems will work independently and cannot simultaneously

Information Security and Assurance Metrics (ISAM) A Framework for Defining Security, Assurance, and Associated Technical Metrics

June 25, 2007
Author(s)
Alicia Clay Jones, Jaime Montemayor, William Blackert, David Carman, Anusha Saksena, Paul Schuster, David Silberberg
This report summarizes the results of interviews with a multi-disciplinary group of experts who share an interest in information security and assurance metrics (ISAM). We used their feedback to create a framework or model for developing definitions for

Frequency Comparison of Al + and Hg + Optical Standards

June 24, 2007
Author(s)
Till P. Rosenband, David Hume, Anders Brusch, Luca Lorini, P. O. Schmidt, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, Nathan R. Newbury, W Swann, Windell Oskay, Wayne M. Itano, David J. Wineland, James C. Bergquist
We compare the frequencies of two single ion frequency standards: 27Al + and 199Hg +. Systematic fractional frequency uncertainties of both standards are below 10 -16, and the statistical measurement uncertainty is below 5 x 10 -17. Recent ratio

Frequency-Tunable Josephson Junction Resonator for Quantum Computing

June 23, 2007
Author(s)
Kevin Osborn, Joshua Strong, Adam J. Sirois, Raymond W. Simmonds
We have fabricated and measured a high-Q Josephson junction resonator with a tunable resonance frequency. A dc magnetic flux allows the resonance frequency to be changed by over 10%. Weak coupling to the environment allows a quality factor of 7000 in the

ACJVS Operating Margins using a Ternary Arbitrary Bitstream Generator

June 22, 2007
Author(s)
Ernest Houtzager, Samuel Benz, Helko vanden Brom
In this paper we present measurements with a pulse-driven AC Josephson voltage standard (ACJVS) that uses a ternary arbitrary bitstream generator as the bias source. From these measurements we conclude that the circuit is operational for voltages up to 220

The Polarizability of Helium and Gas Metrology

June 22, 2007
Author(s)
James W. Schmidt, R Gavioso, E May, Michael R. Moldover
Using a quasi-spherical, microwave cavity resonator, we measured the refractive index of helium to deduce its molar polarizability A ε in the limit of zero density. We obtained (A ε,meas - A ε,theory)/A ε = (-1.8plus or minus} 8.4)× 10 -6, where the

Delamination strength of YBCO coated conductors under transverse tensile stress

June 21, 2007
Author(s)
Daniel C. van der Laan, John (Jack) W. Ekin, Cameron C. Clickner, Theodore C. Stauffer
We present a new experimental technique to measure the delamination strength under transverse tensile stress of YBa 2Cu 3O 7-δ coated conductors for electric power applications. The delamination strength, defined as the tensile stress at which the ceramic

Experimental Evaluation of SiC PiN Diode Forward Bias Degradation and Long Term Stability

June 21, 2007
Author(s)
Madelaine H. Hernandez, Adwoa Akuffo, Colleen E. Hood, Jose M. Ortiz, Allen R. Hefner Jr.
New automated metric systems and procedures have been developed and introduced in order to evaluate the long stability of SiC PiN diodes, and long term stability results are presented for 10 kV SiC PiN diodes that are made using a new low degradation

High-Voltage, High-Frequency SiC Power MOSFETs Model Validation

June 21, 2007
Author(s)
Jose M. Ortiz, Tam H. Duong, Angel Rivera-Lopez, Allen R. Hefner Jr.
Simulated results for techniques used to validate the on-state, resistive load switching, inductive load switching, and high voltage depletion capacitance performance for 4H-SiC power MOSFETs are presented. The validation is performed using a script

Role of Interfacial Water in the Adhesion Loss of Polymer/Substrate Systems and Composites

June 21, 2007
Author(s)
Tinh Nguyen, Joannie W. Chin, E Byrd, David Alshed, Cyril Clerici, Jonathan W. Martin
Water at the polymer/substrate interface in coatings, adhesives, and fiber-reinforced polymer composites is often the main cause of adhesion loss in these systems. Using experimental data measured in this study, we critically assess the role of interfacial

A Multi-Criteria Web Services Composition Problem

June 20, 2007
Author(s)
Jeong Buhwan, Hyunbo Cho, Boonserm Kulvatunyou, Albert W. Jones
With its prevalence in enterprise applications integration, the service-oriented approach has been studied in various ways. The popularity, however, results in a number of different standards and implementations. The approach needs agreed-upon definitions
Displaying 32351 - 32375 of 73830
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