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Displaying 34326 - 34350 of 73832

Power Control in Multihop CSMA

June 1, 2006
Author(s)
Hamid Gharavi, Bo Yan
We have implemented a quantum key distribution (QKD) system with polarization encoding at 850 nm over 1 km of optical fiber. The high-speed management of the bit-stream, generation of random numbers and processing of the sifting algorithm are all handled

Preparation and Characterization of a Suite of Ephedra-Containing Standard Reference Materials

June 1, 2006
Author(s)
Katherine E. Sharpless, D L. Anderson, J. M. Betz, Therese A. Butler, S. G. Capar, J. Cheng, C. Fraser, M. L. Gay, G. Gardner, D W. Howell, T. Ihara, J. W. Lam, Stephen E. Long, M. McCooeye, Elizabeth A. Mackey, W. R. Mindak, S. Mitvalsky, Karen E. Murphy, Karen W. Phinney, A. NguyenPho, Barbara J. Porter, M. C. Roman, Lane C. Sander, Mary B. Satterfield, C. Scriver, R. E. Sturgeon, Jeanice M. Brown Thomas, Robert D. Vocke Jr., Stephen A. Wise, Laura J. Wood, L. Yang, James H. Yen, G. C. Ziobro

Representation of Heterogeneous Material Properties in the Core Product Model

June 1, 2006
Author(s)
Arpan Biswas, Steven J. Fenves, V Shapiro, Ram D. Sriram
The Core Product Model (CPM) was developed at NIST as a high level abstraction for representing product related information, to support data exchange, in a distributive and a collaborative environment. In this paper, we extend the CPM to components with

Selecting Effective Test Messages

June 1, 2006
Author(s)
Leonard E. Gebase, Roch Bertucat, Robert D. Snelick
One of the first problems that must be addressed when attempting to test the reliability of any software implementation is determining what is to be tested. The number of paths an implementation can follow is generally much too large to be able to test all

Special Issue on Collaborative Engineering

June 1, 2006
Author(s)
Ram D. Sriram, Simon Szykman, D Durham
Design of complex engineering systems is increasingly becoming a collaborative task among designers or design teams that are physically, geographically, and temporally distributed. The complexity of modern products means that a single designer or design

Structural alterations in breast stromal and epithelial DNA: the influence of 8,5'-cyclo-2'-deoxyadenosine

June 1, 2006
Author(s)
K. M. Anderson, Pawel Jaruga, C. R. Ramsey, N. K. Gilman, V. M. Green, S. W. Rostad, J. T. Emerman, M Miral Dizdar, D. C. Malins
(5'S)-8,5'-Cyclo-2'-deoxyadenosine (S-cdA), which arises from the reaction of the hydroxyl radical (*OH) with 2'-deoxyadenosine in DNA, is a lesion comprising a base-sugar linkage that distorts the DNA backbone. This structure impedes transcription and

The 2006 Upper Ontology Summit Joint Communique

June 1, 2006
Author(s)
Leo Obrst, Patrick Cassidy, Steven R. Ray, Bradford Smith, Dagobert Soergel, Matthew West, Peter Yim
On March 14-15 in Gaithersburg, MD, at the US National Institute of Standards and Technology (NIST), the Upper Ontology Summit (UOS) took place. The Upper Ontology Summit was a convening of custodians of several prominent upper ontologies, key ontology

The National Marine Mammal Tissue Bank Specimen Inventory

June 1, 2006
Author(s)
Rebecca S. Pugh, Michael B. Ellisor, Amanda J. Moors, Paul R. Becker, Barbara J. Porter, Elizabeth A. Mackey, Michele M. Schantz, R. Demiralp, Stephen A. Wise
The National Institute of Standards and Technology (NIST) provides for the cryogenic banking of marine mammal tissues in the National Marine Mammal Tissue Bank (NMMTB). The purpose of the NMMTB is to maintain quality controlled marine mammal tissues to

Thermochemical and Thermophysical Properties of JP-10

June 1, 2006
Author(s)
Thomas J. Bruno, Marcia L. Huber, Arno D. Laesecke, Eric Lemmon, Richard A. Perkins
This report describes measurement and modeling efforts performed on the missile fuel, JP-10. Measurements* include chemical analysis, thermal decomposition kinetics, density, viscosity, speed of sound, thermal conductivity and vapor pressure (distillation

User Interface of Simulation of the Shipbuilding Operations

June 1, 2006
Author(s)
Guodong Shao, Charles R. McLean, Swee K. Leong
This paper discusses the development of the user interface for a simulation of the shipbuilding operations. It presents an overview of a generic simulation of shipbuilding operations, the simulation system's user profiles, and the user interface screen

Wrinkling of Ultrathin Polymer Films

June 1, 2006
Author(s)
Rui Huang, Christopher Stafford, B D. Vogt
This paper presents a bilayer model to account for surface effects on the wrinkling of ultrathin polymer films. Assuming a surface layer of finite thickness, effects of surface properties on the critical strain, the equilibrium wavelength, and the wrinkle

Forensic Tools for Mobile Phone Subscriber Identity Modules

May 31, 2006
Author(s)
Wayne Jansen, Richard Ayers
Cell phones and other handheld devices incorporating cell phone capabilities (e.g., smart phones) are ubiquitous. Besides placing calls, cell phones allow users to perform other tasks such as text messaging and phonebook entry management. When cell phones

Microfabricated atomic clocks and magnetometers

May 31, 2006
Author(s)
Svenja A. Knappe, P Schwindt, Vladislav Gerginov, V Shah, Hugh Robinson, Leo W. Hollberg, John E. Kitching, Li-Anne Liew, John Moreland
We demonstrate the critical subsystems of compact atomic clocks and magnetometers based on microfabricated physics packages. The clock components have a volume below 5 cm 3, a fractional frequency instability below 6x10 -10/τ 1⁄2, and consume 200 mW of

Voltage Versus Magnetic Field Measurements on Nb 3 Sn Wires

May 31, 2006
Author(s)
Loren F. Goodrich
We measured voltage versus magnetic field (V-H}/I}) on commercial Nb 3Sn wires. Typically, voltage-current (V-I) at constant field is measured to determine the critical current (I c). Recently, V-H at constant or ramping current is being measured to assess
Displaying 34326 - 34350 of 73832
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