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Displaying 3751 - 3775 of 74068

Universal RNA Reference Materials for Gene Expression

October 12, 2021
Author(s)
M Cronin, K Ghosh, F Sistare, J Quackenbush, V L. Vilker, C D. O'Connell
A NIST sponsored workshop entitled Metrology and Standards Needs for Gene Expression Technologies: Universal RNA Standards was held on March 28-29, 2003 to define the need for standardization of the biological component of RNA based molecular assays

University Involvement in ATP and Effect on Project Outputs

October 12, 2021
Author(s)
F A. Moris, C Chang, Andrew J. Wang
Universities play a key role in the U.S. innovation system. Universities are engaged in research at the scientific and technological frontier. Private companies may choose to collaborate with universities to gain access to eminent researchers and/or to

Unusual DNA Conformations From Intron 21 of the PKD1 Gene Cause Mutagenesis

October 12, 2021
Author(s)
A Bacolla, A Jaworski, A Larson, J P. Jakupciak, C D. O'Connell, R D. Wells
Intron 21 of the polycystic kidney disease 1 (PKD1) gene contains a 2.5 kbp of purine-pyrimidine asymmetry [poly(R-Y)] predicted to adopt unusual DNA structures (slipped, triplexes, tetraplexes)and proposed to cause mutations in the gene. The poly (R-Y)

Variational Methods for Microstructural Evolution

October 12, 2021
Author(s)
W Carter, J E. Taylor, John W. Cahn
The application of variational methods and gradient flows to principles of microstructural evolution are reviewed. For the cases considered in this paper, gradient flows specify a trajectory along with the free energy decreases most rapidly. The gradient

Vector-Valued Phase Field Model for Crystallization and Grain Boundary Formation

October 12, 2021
Author(s)
R Kobayashi, James A. Warren, W Carter
We propose a new model for calculation of the crystallization and impingement of many particles with differing orientations. Based on earlier phase field models, a vector order parameter is introduced, and thus orientation of crystal/disordered interfaces

Virial Coefficients of Mixtures

October 12, 2021
Author(s)
J H. Dymond, K N. Marsh, R C. Wilhoit, Michael D. Frenkel
This critical compilation of virial coefficients of mixtures is a sequel to The Virial Coefficients of Pure Gases and Mixtures, by J.H. Dymonand E.B. Smith (Oxford Universi Press, 1979) and a companion of Virial Coefficients of Gases and Gas Mixtures

Virtual Sensor Simulation Study of Flow During Resin Transfer Molding Process

October 12, 2021
Author(s)
S R. Kueh, S G. Advani, Richard~undefined~undefined~undefined~undefined~undefined Parnas
In any manufacturing environment, on-line sensing can play an important part in controlling the quality of the final product. Having a sensor embedded within the part itself is often the most effective means of monitoring its condition at various stages of

Viscous Flow Creep in Ceramics Containing Secondary Crystalline Phases

October 12, 2021
Author(s)
Q Jin, D S. Wilkinson, G C. Weatherly, William E. Luecke, Sheldon M. Wiederhorn
Experimental observations of the creep response of a Y 20 3-fluxed Si 3N 4 containing secondary crystalline phases(SP)are presented.The widths of grain-boundary amorphous films before and after creep have been characterized by using transmission electron

Visualization and Quantification of Forced In-Plane Flow Through Deformable Porous Media

October 12, 2021
Author(s)
H L. Friedman, R A. Johnson, V Gussev, A V. Neimark, D R. Salem, Richard~undefined~undefined~undefined~undefined~undefined Parnas
Fluid flow in liquid molding processes and in other applications involving porous media is often characterized with a permeability tensor and modeled by d'Arcy's law. The permeability is a sensitive function of pore structure which, in deformable materials

Volumetric and Size Characterization of Void Morphologies in Thermally Sprayed Metallic Deposits Using Scattering Techniques

October 12, 2021
Author(s)
T Keller, W. Wagner, J Ilavsky, Andrew J. Allen, N Margadant, S Siegmann, J Pisacka, G Barbezat, R Enzl
The complex void microstructure of thermally sprayed deposits may be approximated by three major void syste(interlamellar pores, intralamellar cracks, and volumetric globular voids), each with different volume fractions,anisotropies, sizes and shapes. This

Wear Analysis of UHMWPE Using a Load Sum Method

October 12, 2021
Author(s)
M C. Shen, Stephen M. Hsu, John A. Tesk, A Christou
An accelerated wear test pro-cedure has been developed for wear screening of ultra-high molecular weight polyethylene (UHMWPE) using a new wear tester. Results showed that the test procedure was able to discriminate known wear level samples within seven

Wind-Excited Torsional Response of Tall Buildings

October 12, 2021
Author(s)
I Venanzi, William P. Fritz
A procedure for the evaluation of wind-induced torsional vibrations of tall buildings is proposed. The procedure is capable of accounting for the time-dependent eccentricity of the aerodynamic forces on the building surface with respect to the elastic

Wind-Tunnel Model Scale and Estimates of Wind Effects on Low-Rise Buildings

October 12, 2021
Author(s)
Michael A. Riley, Emil Simiu
Although the wind load provisions of many modern building codes are based on the results of wind tunnel testing, some effects of model scale and pressure tap quantity are still not well understood. Using test data obtained at two different scales for a low

Wireless Ad-hoc Network for Trades Tracking

October 12, 2021
Author(s)
D P. Starin, William C. Stone
The NIST Construction Metrology and Automation Group (CMAG), at the suggestion of various members of the CII FIATECH consortium, investigated the possibility of developing an economical, rugged system for approximate localization of crafts and trades

X-Ray Diffraciton and the Existence of Long Range Internal Stresses

October 12, 2021
Author(s)
M A. Delos-Reyes, M E. Kassner, Lyle E. Levine
Long range internal stresses (LRIS) are often used to explain various aspects of the mechanical behavior of materials. Recent experiments by the authors indicate an absence of measurable LRIS. X-ray line asymmetry, however, has long been interpreted as an

X-Ray Diffraction Study of the Optimization of MgO Growth Conditions for Magnetic Tunnel Junctions

October 12, 2021
Author(s)
O Se Young, C G. Lee, Alexander J. Shapiro, William F. Egelhoff Jr., Mark D. Vaudin, Jennifer L. Klamo, J Mallett, Philip Pong
MgO based magnetic tunnel junctions (MTJs) show large tunneling magnetoresistance (TMR) effects and are currently the most promising technology for the applications in magnetoelectronics devices. Conventional MTJs with amorphous AlOx barriers yield TMR

X-Ray Spectroscopy and Calibrations in the 50 eV to 60 keV Range

October 12, 2021
Author(s)
J Seely, Uri Feldman, J. Weaver, Lawrence T. Hudson
Spectrometers have been developed to record x-ray spectra in the energy range 50 eV to 60 keV. The dispersion elements are transmission crystals for energies higher than approximately 11 keV, reflection crystals for 1 keV to 20 keV, and transmission
Displaying 3751 - 3775 of 74068