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Displaying 41201 - 41225 of 74167

The Role Control Center: Features and Case Studies

June 4, 2003
Author(s)
David F. Ferraiolo, Gail-Joon Ahn, Ramaswamy Chandramouli, Serban I. Gavrila
Role-based Access Control (RBAC) models have been implemented not only in self-contained resource management products such as DBMSs and Operating Systems but also in a class of products called Enterprise Security Management Systems (ESMS). ESMS products

Detector-Based Sphere Photometry for Industry

June 2, 2003
Author(s)
Yoshihiro Ohno, R S. Bergman
The Absolute Integrating Sphere Method is now used at NIST for the detector-based calibration of total luminous flux of lamps, as well as for the realization of the lumen. This method has many benefits for high-accuracy applications, allowing for

Effects of Bending in Brass Rockwell B Scale Test Blocks

June 2, 2003
Author(s)
Samuel R. Low III, J L. Fink
As part of a project to produce primary hardness reference blocks for the Rockwell B hardness scale at the National Institute of Standards and Technology (NIST), studies were conducted to observe the stability of the hardness value of the blocks over a

SCUBA-2: Developing the Detectors

June 2, 2003
Author(s)
William Duncan, Wayne Holland, Damian Audley, M. Cliffe, T. Hodson, B. D. Kelly, X. Gao, D. Gostick, Michael MacIntosh, H. McGregor, T. Peacocke, Kent D. Irwin, Gene C. Hilton, Steven Deiker, Joern Beyer, Carl D. Reintsema, Anthony Walton, William Parkes, T. Stevenson, Alan Gundlach, Camilla Dunare, Peter Ade
SCUBA-2 is a second generation, wide-field submillimeter camera under development for the James Clerk Maxwell Telescope. With over 12,000 pixels, in two arrays, SCUBA-2 will map the submillimeter sky 1000 times faster than the current SCUBA instrument to

4K Cryocooler Implementation of a DC Programmable Voltage Standard

June 1, 2003
Author(s)
Charles J. Burroughs, Robert J. Webber, Paul Dresselhaus, Samuel Benz
NIST and Hypres, Inc. have been collaborating to develop a 1 Volt DC programmable Josephson voltage standard (PJVS) that operates on a closed-cycle refrigerator. The goal of this work is to construct a platform that will allow the chip to work at 4 K

A Fast, Deterministic Source of Single Cr Atoms

June 1, 2003
Author(s)
Jabez J. McClelland, Shannon B. Hill
We produce single Cr atoms on demand by feedback control of loading and loss from a magneto-optical trap. We observe single-atom occupation probabilities of over 98% and efficient ejection at rates up to 10 Hz.

A Model to Predict Hurricanes Induced Losses for Residential Structures

June 1, 2003
Author(s)
J P. Pinelli, C Subramanian, L. Zhang, K Gurley, A Cope, Emil Simiu, S M. Diniz, S Hamid
This paper presents a practical probabilistic model for the projection of annualized damage costs to residential structures due to hurricanes. The estimation of the damage is accomplished by first defining the basic damage modes for components of specific

A Product Information Modeling Framework For Product Lifecycle Management

June 1, 2003
Author(s)
Steven J. Fenves, Ram D. Sriram, Sudarsan Rachuri, Fujun Wang
We describe a framework for representing products based on the NIST Core Product Model (CPM) and its extensions, the Open Assembly Model (OAM), the Design-Analysis Integration model (DAIM), and the Product Family Evolution Model (PFEM). These are abstract

A Survey of Design ? Analysis Integration Issues

June 1, 2003
Author(s)
Greg Mocko, Steven J. Fenves
The report constitutes a survey of work directed towards the emergence of next-generation product development tools, specifically in the area of design-analysis integration. The report is organized into two main areas: (1) an examination of issues

Absolute Alignment of the Reference Retroreflectometer at NIST

June 1, 2003
Author(s)
Carl C. Miller
The National Cooperative Highway Research Program (NCHRP Project 05-16) awarded The National Institute of Standards and Technology (NIST) a contract to develop a dedicated reference instrument for measuring retroreflective materials, and a calibration

An Experimental Method for Measuring Mechanical Properties of Rat Pulmonary Arteries Verified With Latex

June 1, 2003
Author(s)
Elizabeth S. Drexler, Andrew J. Slifka, J Wright, Christopher N. McCowan, Dudley Finch, Timothy P. Quinn, J D. McCloskey, Dunbar Ivy, Robin Shandas
A study of the biomechanics and hemodynamics of pulmonary hypertension is incomplete without including mechanical properties data comparing healthy and diseased arterial tissue. In the initial stabe of this study, Sprague-Dawley rats will be induced with

An Interface Data Model Supporting Manufacturing Simulation

June 1, 2003
Author(s)
Yung-Tsun Lee, Yan Luo, Charles R. McLean
Simulation technology is underutilized by the manufacturing industry. Standard data interfaces, among simulation modules or between simulation and other software applications, could make information sharing effective and efficient, and hence promote

An Open Framework for the Assembly of Micro- and Nano-Scale Artifacts

June 1, 2003
Author(s)
Shaw C. Feng, Yung-Tsun Lee, Kevin W. Lyons
The design and manufacture of miniature devices have been increasing in both research laboratories and industry. The sizes of the devices continue to decrease to the nanometer scale. At the same time, the complexity of those devices has increased. To

Assembly Simulation in the Design Process in a Distributed Environment

June 1, 2003
Author(s)
Charles R. McLean, Deogratias Kibira, William Reiter, Paul Maropoulos
Simulation technology i s applicable across a distributed enterprise in the pursuit of bringing high quality products to the market in minimum time. The proliferation of computing technology and software applications now makes simulations available to many

ASSET: Security Assessment Tool for Federal Agencies

June 1, 2003
Author(s)
Elizabeth B. Lennon
This ITL Bulletin describes the features and capabilities of the Automated Security Self-Evaluation Tool (ASSET), ITL's governmentwide IT security assessment tool. ASSET automates the completion of the security questionnaire in NIST Special Publication 800

Banishing Quasiparticles From Josephson-Junction Qubits: Why and How To Do It

June 1, 2003
Author(s)
Kristine Lang, Sae Woo Nam, Joe Aumentado, John M. Martinis, C Urbina
Current-biased Josephson junctions are prime candidates for the implementation of quantum bits; however, a present limitation is their coherence time. In this paper we qualitatively describe the role of quasiparticles in decoherence. We discuss two methods
Displaying 41201 - 41225 of 74167
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