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Displaying 28951 - 28975 of 74292

Density Functional Theory Study of the Clean and Hydrated Hematite (1 102) Surfaces

October 16, 2008
Author(s)
Cynthia S. Lo, Kunaljeet Tanwar, Anne M. Chaka, Thomas P. Trainor
The structures of the clean and hydrated hematite alpha-Fe2O3 (1-102) surfaces were investigated using density functional theory, and the free energies of the surfaces in chemical equilibrium with water were calculated as a function of temperature and

Dental Adhesion With Self-Etching, Polymerization-Initiating Primers

October 16, 2008
Author(s)
Joseph M. Antonucci, C A. Khatri, Gary E. Schumacher, J E. Code, T Nikaido
Iminoacetic acids are noted for their moderate acidity and ability to chelate metal ions, including the biologically important calcium ion. Previously it was shown that the application of N-phenyliminodiacetic acid (PIDAA) both etches and activates

Dental Ceramic Innovations

October 16, 2008
Author(s)
J R. Kelly
Truly widespread application of ceramics in dental practice (along with major esthetic improvements) awaited two important structural innovations that did not occur until the latter part of this century. The first innovation created today's most often

Description and Results of 2002 Organic Intercomparison ExercisesExercise Materials: Fish Homogenate V (QA02FSH5) Marine Sediment XI (QA02SED11)

October 16, 2008
Author(s)
Michele M. Schantz, John Kucklick, Reenie M. Parris, Dianne L. Poster, Stephen Wise
In support of marine monitoring measurement programs, the National Institute of Standards and Technology (NIST) conducts yearly interlaboratory comparison exercises to provide one mechanism for participating laboratories/monitoring programs to evaluate the

Description and Results of the 2005 NIST/NOAA Interlaboratory Comparison Exercise Program for Organic Contaminants in Marine Mammal Tissues

October 16, 2008
Author(s)
John Kucklick, Rebecca Pugh, Paul R. Becker, Michele M. Schantz, Stephen Wise, T K. Rowles
The National Institute of Standards and Technology (NIST), in support of the National Oceanic and Atmospheric Administration s Marine Mammal Health and Stranding Response Program (NOAA/MMHSRP), conducts annual interlaboratory comparison exercises for the

Detection of Pinholes in Magnetic Tunnel Junctions by Magnetic Coupling

October 16, 2008
Author(s)
Philip Pong, Cindi L. Dennis, Audie M. Castillo, Andrew P. Chen, William F. Egelhoff Jr.
Pinholes in tunnel barriers are detrimental to the performance of magnetic tunnel junctions (MTJ) since they create direct magnetic exchange coupling between the free and pinned magnetic films and may act as current short circuits. A simple and

Development of the Atomic and Molecular Data Markup Language for Internet Data Exchange

October 16, 2008
Author(s)
Y Ralchenko, R Clark, D Humbert, David R. Schultz, T Kato, Y J. Rhee
Accelerated development of the Internet technologies, including those relevant to the atomic and molecular physics, poses new requirements for the proper communication between computers, users and applications. To this end, a new standard for atomic and

DHS Leads the Way to Standards for Homeland Security

October 16, 2008
Author(s)
Laurie E. Locascio
In late April 2005, in response to a recently issued GAO report describing the urgent need for standards and validated methods related to biological incident response, Dr. Bert Coursey, head of the Standards Portfolio at DHS, charged NIST with the task of

Diameter Dependent Transport Properties of GaN Nanowire Field Effect Transistors

October 16, 2008
Author(s)
Abhishek Motayed, Mark D. Vaudin, Albert Davydov, John Meingailis, Maoqi He, S N. Mohammad
We report transport properties measurements of individual GaN nanowire field effect transistors and the correlation of the electron mobilities with the existence of grain boundaries in these nanowires. These nanowires are grown by direct reaction of NH3

Dielectric and Thermal Properties of Multi-Layer Polymer Films

October 16, 2008
Author(s)
W Sakai, T Yoshiji, N Tsutsumi, C. K. Chiang
The dielectric and thermal properties of three-layer structured films were studied. The two outer layers were about one microns and the thickness of middle layer was varied. We measured the thickness dependence of the dielectric constant of the three-layer

Dielectric Measurement Methods at Millimeter Wave Frequencies

October 16, 2008
Author(s)
Michael D. Janezic
We review several techniques for making accurate relative permittivity and loss tangent measurements of low-loss dielectric materials at frequencies between 30 and 100 GHz. Many conventional methods that operates at microwave frequencies are impracatical

Diffuse Reflectance of Sintered and Pressed Polytetrafluroethylene (PTFE)

October 16, 2008
Author(s)
P Y. Barnes, E A. Early
Polytetrafluoroethylene (PTFE) is widely used in applications requiring a material with a diffuse reflectance factor close to unity. The bidirectional reflenctance distribution function (BRDF) of both pressed and sintered samples was measured as a function

Diffusional Creep: Stresses and Strain Rates in Thin films and Multilayers

October 16, 2008
Author(s)
Daniel Josell, Timothy P. Weihs, H Gao
In this article, we discuss creep deformation as it relates to thin films and multilayer foils. We begin by reviewing experimental techniques for studying creep deformation in thin-film geometries, listing the pros and cons of each; then we discuss the use
Displaying 28951 - 28975 of 74292