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Displaying 3801 - 3825 of 74647

Improved Facility for Optical Detector Characterization

October 12, 2021
Author(s)
T Flournoy, George P. Eppeldauer
The detector characterization and calibration facility of the Army Primary Standards Laboratory (APSL) has been extended. In addition to the traditional filter and monochromator based spectral measurements, laser-based sphere sources and high performance

Improved Theoretical X-Ray Resonant Scattering Amplitudes

October 12, 2021
Author(s)
J O. Cross, M I. Bell, M Newville, J J. Rehr, L B. Sorensen, Charles E. Bouldin, G Watson, T Gouder, G H. Lander
Resonant elastic scattering amplitudes [Δ]f = f[u'] + if[u''] in the vicinity of the absorption edges have been obtained by applying a differential Kramers-Kronig transform to theoretical absorption cross-sections calculated by the ab initio x-ray

Improved Transition Oscillator Probabilities for Laser Transitions in Xe I

October 12, 2021
Author(s)
Abhijit Dasgupta, J P. Apruzes, O Zatsarinny, K Bartschat, Charlotte F. Fischer
The atomic xenon laser is among the most efficient and powerful of thenear-infrared gas lasers, especially when pumped by molecular ions in an Ar-Xemixture. Accurate oscillator strengths for the laser transitions are criticaltodeveloping a fundamental

In-Situ Investigation of Water Transport in an Operating PEM Fuel Cell Using Neutron Radiography: Part 1 - Experimental Method and Serpentine Flow Field Results

October 12, 2021
Author(s)
T Trabold, Jon P. Owejan, David L. Jacobson, P R. Huffman
Effective management of liquid water produced in the cathodic reaction of a polymer electrolyte membrane (PEM) fuel cell is essential to achieve high cell efficiency. Few experimental methods are available for in-situ measurements of water transport within

Influence of Drawbeads in Deep Drawing of Plane-Strain Channel Sections

October 12, 2021
Author(s)
D E. Green, T B. Stoughton, Thomas H. Gnaupel-Herold, Mark Iadicola, Timothy J. Foecke
The Numisheet 2005 Benchmark 3 consisted of forming four different automotive sheet materials in a two-stage process. The first stage consisted of forming channel sections in an industrial-scale channel draw die in which material flow is controlled by

Influence of Polarity on GaN Thermal Stability

October 12, 2021
Author(s)
M A. Mastro, O M. Kryliouk, T J. Anderson, Albert Davydov, Alexander J. Shapiro
A comparative study of the stability of Ga- and N-polar GaN films was made in different gas ambients (N2, H2, NH3, HCl). The Ga-polar films were observed to undergo a dissociative sublimation, while the N-polar films formed condensed Ga in addition to the

InN Layers Grown by HVPE

October 12, 2021
Author(s)
A Syrkin, V Ivantsov, A Usikov, Vladimir A. Dmitriev, G Chambard, P Ruterana, Albert Davydov, Siddarth Sundaresan, E Lutsenko, A V. Mudryi, E D. Readinger, G D. Chern-Metcalfe, M Wraback
We report on the first time demonstration and properties of high quality HVPE InN and on successful subsequent MBE growth of InN layers with improved characteristics on template substrates. InN layers were grown on GaN/sapphire HVPE grown templates. The

Intercomparison of Extrapolation Chamber Measurements of the Absorbed Dose Rate in Tissue for Beta Radiation

October 12, 2021
Author(s)
R Behrens, K Helmstadter, P Ambrosi, J M. Bordy, C Lecante, M Bovi, I Jokelainen, Christopher G. Soares, P R B Saull, A Kharitonov, S Fedina, T Kurosawa, M Kato
The first EUROMET comparison for the standards for absorbed dose rate in 0.07 mm tissue depth for beta radiation of eight national metrology institutes has been completed. The participants were LNE-LNHB (FR), ENEA (IT), STUK (FI), PTB (DE), and four

Interface-Anisotropy Induced Asymmetry of Intermixing in Bilayers

October 12, 2021
Author(s)
P Sule, M. Menyhard, L Kotis, J Labar, William F. Egelhoff Jr.
The ion-sputtering induced intermixing is studied by molecular dynamics (MD) simulations and by Auger electron spectroscopy depth profiling (AES-SP) analysis in PT/Ti/Si (Pt/Ti) and Ta/Ti/Pt/Si(Ti/Pt) bilayers. Experimental evidence is found for the

Ionization of W and W+ by Electron Impact

October 12, 2021
Author(s)
D H. Kwon, Y J. Rhee, Yong Sik Kim
Theoretical cross sections for electron-impact ionization of the neutral W atom and W$^+$ ion are reported. The direct ionization cross sections were calculated by using the binary-encounter Bethe (BEB) model and the indirect ionization cross sections
Displaying 3801 - 3825 of 74647