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Displaying 3326 - 3350 of 3362

Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry Interlaboratory Comparison of Mixtures of Polystyrene With Different End Groups: Statistical Analysis of Mass Fractions and Mass Moments

July 1, 2005
Author(s)
Charles M. Guttman, S Wetzel, Kathleen M. Flynn, B M. Fanconi, David L. VanderHart, William E. Wallace
A matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) interlaboratory comparison was conducted on mixtures of synthetic polymers having the same repeat unit and closely matching molecular mass distributions but with

An Overview of Nano-Micro-Meso Scale Manufacturing at NIST

January 1, 2000
Author(s)
E C. Teague, Jun-Feng Song, Bradley N. Damazo, John Evans, Matthew A. Davies, Nicholas G. Dagalakis
The Manufacturing Engineering Laboratory (MEL) has a unique mission of discrete part manufacturing technology within the National Institute of Standards and Technology''s (NIST) mission of measurement, standards, data and infrastructure technology. Several

Alignment and Orientation Effects in Sr Energy Pooling

December 1, 1999
Author(s)
Harold V. Parks, S R. Leone
Alignment and orientation effects in the energy pooling process, Sr(5s5p 3P 1) + Sr(5s5p 3P 1)-> Sr(5s5p 1P 1) + Sr(5s 2 1S o), are studied in a single atomic beam. The Sr atoms are prepared in an aligned initial state with a polarized laser, and alignment

Field-Only Surface Integral Equations: Scattering from a Perfect Electric Conductor

February 1, 2020
Author(s)
Qiang Sun, Evert Klaseboer, Alex Yuffa, Derek Y. Chan
A field-only boundary integral formulation of electromagnetics is derived without the use of surface currents that appear in the Stratton--Chu formulation. For scattering by a perfect electrical conductor (PEC), the components of the electric field are

Final Report on CIPM Key Comparison of Multiples and Submultiples of the Kilogram (CCM.M-K2)

October 12, 2021
Author(s)
L O. Becerra, W Bich, N Bignell, G D. Chapman, J.-H. Chung, Stuart Davidson, M Glaser, A Gosset, Zeina J. Kubarych, W G. Lee, A Ooiwa, P Richard, R Spurny, A Torino, J Verbeek, L Q. Zhang
A key comparison concerning mass determination of five mass standards has been carried out under the auspices of the Comite Consultatif pour a la Mase et les Grandeurs Apparantees (CCM) from March 1998 to March 1999. The nominal values of the mass

Use of quantum effects as potential qualifying metrics for "quantum grade silicon"

December 30, 2019
Author(s)
Aruna N. Ramanayaka, Ke Tang, Joseph A. Hagmann, Hyun S. Kim, David S. Simons, Curt A. Richter, Joshua M. Pomeroy
Across solid state quantum information, material deficiencies limit performance through enhanced relaxation, charge defect motion, or isotopic spin noise. While classical measurements of device performance provide cursory guidance, specific qualifying

Colored Oxides with Hibonite Structure: A Potential Route to Non-cobalt Blue Pigments

December 1, 2016
Author(s)
Jun Li, Elena A. Medina, Judith K. Stalick, Arthur W. Sleight, M. A. Subramanian
The crystal structure of hibonite with an ideal formula CaAl 12O 19 is hexagonal P6 3/mmc, isostructural with magnetoplumbite. Natural and synthetic hibonites have been widely studied for their formation, compositions, crystal structures, properties and

Neutron Interferometric Measurement of the Scattering Length Difference Between the Triplet and Singlet States of N-3 He.

June 4, 2014
Author(s)
Michael G. Huber, Muhammad D. Arif, Wei-Chen N. Chen, Thomas R. Gentile, Daniel S. Hussey, T C. Black, Dimitry A. Pushin, F. E. Wiefeldt, C.B Shahi, L Yang
We report a new determination of the n-Helium-3 scattering length difference Δ b = (−5.411 ± 0.031 (statistical) ± 0.039 (systematic) ) fm between the triplet and singlet states using a neutron interferometer. This revises our previous result Δ b = (−5.610

Benchmark of collisional-radiative models for ITER beams at Alcator C-Mod tokamak

November 12, 2013
Author(s)
I. O. Bespamyatnov, W. L. Rowan, K. T. Liao, O. Marchuk, Yuri Ralchenko, R. S.
The beam-based plasma diagnostics on ITER require high accuracy and reliability which accordingly puts challenging requirements on the collisional-radiative (CR) models used for the description of excited states of high energy beam atoms. These states are

Approximate theoretical model for the five electronic states (? = 5/2, 3/2, 3/2, 1/2, 1/2) arising from the ground 3d9 configuration in nickel halide molecules and for the rotational levels of the two ? = 1/2 states in this manifold

January 25, 2011
Author(s)
Jon T. Hougen
This paper is divided into two parts. In the first part an effective Hamiltonian for a non-rotating diatomic molecule containing only crystal-field and spin-orbit operators is set up to describe the energies of the five spin-orbit components that arise in

Architecture and Dynamics of C18 Bonded Interphases with Small Molecule Spacers

December 15, 2009
Author(s)
Lane C. Sander, Katrice A. Lippa, Catherine A. Rimmer, Maximilian Kuhnle, Volker Friebolin, Klaus Albert
The relationship between alkyl phase structure and chromatographic performance is investigated for a series of octadecyl (C18)- modified silica surfaces with defined spacing of the alkyl surface by a “pre-endcapping” technique. Stationary phases were

Optimization of Accurate SEM Imaging by Use of Artificial Images

May 22, 2009
Author(s)
Petr Cizmar, Andras Vladar, Michael T. Postek
Today the vast majority of the scanning electron microscopes (SEMs) are incapable of taking repeatable and accurate images at high magnifications. Geometric distortions are common, so are drift, vibration, and problems related to disturbing electro

The Effects of Small Metal Additions (Co, Cu, Ga, Mn, Al, Bi, Sn) on the Magnetocaloric Properties of the Gd 5 Ge 2 Si 2 Alloy

April 26, 2006
Author(s)
Robert D. Shull, Virgil Provenzano, Alexander J. Shapiro, A Fu, M W. Lufaso, E Karapetrova, G Kletetschka, V Mikula
It was shown that adding one atomic percent Fe to Gd5Ge2Si2 greatly reduced its large hysteresis losses, broadened the magnetic entropy change, ?Sm, versus temperature, T, peak, and shifted the ?Sm peak value from 275 K to 305 K[1]. The present paper

Non-Contact Determination of Free Carrier Concentration in n-GaInAsSb

January 1, 2004
Author(s)
James E. Maslar, Wilbur S. Hurst, C Wang, D A. Shiau
GaSb-based semiconductors are of interest for mid-infrared optoelectronic and high-speed electronic devices. Accurate determination of electrical properties is essential for optimizing the performance of these devices. However, electrical characterization

SQUIDs Past, Present, and Future: A Sympsium in Honor of Jim Zimmerman

October 1, 2000
Author(s)
Richard L. Kautz
The symposium on SQUIDs Past, Present, and Future was held at the National Institute of Standards and Technology in Boulder, Colorado on November 15, 1997 to celebrate the career of James E. Zimmerman. As a member of a team at the Ford Scientific

CODATA recommended values of the fundamental physical constants: 2006

April 1, 2008
Author(s)
Peter J. Mohr, Barry N. Taylor, David B. Newell
The paper give the 2006 self-consistent set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on data for Science and Technology (CODATA) for international use. Further, it describes in detail the

Enhanced Conductivity via Homopolymer-Rich Pathways in Block Polymer-Blended Electrolytes

December 24, 2019
Author(s)
Melody A. Morris, Seung Hyun Sung, Priyanka M. Ketkar, Joseph Dura, Ryan Nieuwendaal, III Epps
The optimization of ionic conductivity and lithium-ion battery stability can be achieved by independently tuning the ion transport and mechanical robustness of block polymer (BP) electrolytes. However, the ionic conductivity of BP electrolytes is

Determination of spin Hall effect and spin diffusion length of Pt from self-consistent fitting of damping enhancement and inverse spin-orbit torque measurements

March 22, 2018
Author(s)
Andy Berger, Eric R. Edwards, Hans T. Nembach, Olof Karis, Mathias Weiler, Thomas J. Silva
Understanding the evolution of spin-orbit torque (SOT) with increasing heavy-metal thickness in ferromagnet/normal metal (FM/NM) bilayers is critical for the development of magnetic memory based on SOT. However, several experiments have revealed an
Displaying 3326 - 3350 of 3362
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