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Displaying 45701 - 45725 of 73994

Growth and Characterization of Large Area Cu(In, Ga) Se 2 Films

May 1, 2001
Author(s)
A M. Hermann, Carlos A. Gonzalez, P A. Ramakrishnan, Davor Balzar, C H. Marshall, J N. Hilfiker, T Tiwald
Large area thin films of Cu(In,Ga)Se 2 (CIGS) were grown by sequential sputtering. Photovoltaic cells have been fabricated using these films and the performance bias been characterized. The effect of annealing conditions (temperature and duration) of the

High-Resolution Rb Two-Photon Spectroscopy With Ultrafast Lasers

May 1, 2001
Author(s)
T H. Yoon, A Marian, John L. Hall, Jun Ye
A two-photon wmsition in cold Rb atoms will be probed with a phase-coherent wide-bandwidth femtosecond laser comb. Frequency domainanalysis yields a high resolution picture where phase coherence among various transition pathways through different

Impact of Model-Driven Architecture

May 1, 2001
Author(s)
David W. Flater
The Object Management Group (the consortium that issues the Common Object Request Broker Architecture and Unified Modeling Language standards) is making the transition from a standards architecture in which only interface definitions are normative to one

JILA, National Institute of Standards and Technology, and University of Colorado at Boulder

May 1, 2001
Author(s)
D Z. Anderson, J E. Faller, M J. Holland, L Kolvalenko, S R. Leone, R McCray, David Nesbitt
The revised JILA brochure, written for those interested in NIST programs as well as for prospective graduate students, postdoctoral associates, and visiting fellows, provides an overview of JILA and its mission, and explains the joint nature of the

Large Anisotropy Via Oblique Sputtering of Ta Underlayers

May 1, 2001
Author(s)
John E. Bonevich, Robert D. McMichael, Chang H. Lee, P J. Chen, W Wyatt Miller, William F. Egelhoff Jr.
Anisotropy fields in excess of 120 KA/m (1500 Oe) have been produced in 3 nm to 5 nm thick polycrystalline films of Co by oblique sputtering of Ta underlayers. The unusually high anisotropy is magnetostatic in origin, and is induced by corrugations on the

Lifetimes, Branching Fractions, and Oscillator Strengths of Doubly Ionized Tungsten

May 1, 2001
Author(s)
M Schultz-Johanning, R Kling, R Schnabel, M Kock, ZZ Li, H Lundberg, S Johansson
A first set of W III oscillator strengths has been obtained from combined lifetime and brancing fraction measurements. The branching fractions in the wavelength region of 154-334 nm were measured on a Penning discharge with Fourier transform spectroscopy

Looking at the Whole Picture: A Case Study of Analyzing a Virtual Workplace

May 1, 2001
Author(s)
Michelle P. Steves, Emile L. Morse
Evaluating collaborative systems is much more difficult than evaluating single-user systems due to the number of simultaneous (synchronous) or intertwined (both asynchronous and synchronous) interactions. The types of data that can be gathered are diverse

Luminous Flux Calibrations of LEDs at NIST

May 1, 2001
Author(s)
Carl C. Miller, Yoshihiro Ohno
The total luminous flux (lumen) is one of the most important characteristics of Light Emitting Diodes (LEDs), and is commonly measured using integrating sphere photometers. Large variations of measurement results are reported among different manufacturers

MALDI MS of Saturated Hydrocarbon Polymers: Polyethylene and Other Polyolefins

May 1, 2001
Author(s)
William E. Wallace, Charles M. Guttman, B M. Fanconi, Barry J. Bauer
Saturated hydrocarbon polymers, polyethylene and polypropylene, are, by production volume, the most widely used of all synthetic polymers. Their molecular mass and molecular mass distribution (MMD) are critical in determining performance properties. There

Measurements and Predictions of Light Scattering by Clear Coatings

May 1, 2001
Author(s)
M E. McKnight, Theodore V. Vorburger, Egon Marx, Maria E. Nadal, P Y. Barnes, Michael A. Galler
Comparisons are made between calculations and measured angle-resolved light scattering distributions from clear dielectric isotropic epoxy coatings over a range of rms roughness conditions, resulting in strongly specular scattering characteristics

Modal Cutoff in Coaxial Transmission Lines of Conical and Cylindrical Geometries

May 1, 2001
Author(s)
Claude Weil, Billy F. Riddle, David R. Novotny, Robert T. Johnk
We present numerical data on normalized cutoff wavelength versus cone half-angle for the first three higher-order TE ml modes, as well as four other modes of interest, in conical coaxial transmission lines (the co-conical line). These are given as a

Mode-Locked Erbium/Ytterbium Co-Doped Waveguide Laser

May 1, 2001
Author(s)
John B. Schlager, Berton Callicoatt, Kevin L. Silverman, Richard Mirin, Norman Sanford, D. L. Veasey
Picosecond pulses are generated from a passively mode-locked ER3+/Yb3+ co-doped planar waveguide laser in an extended cavity configuration with a semiconductor saturable absorber mode locker. Average output power exceeds 8 mW and is expected to increase

Modeling Coplanar Waveguide Structrues Constructed of Ferromagnetic Metal

May 1, 2001
Author(s)
Nicholas Cramer, Dave K. Walker
We fabricate coplanar waveguide transmission lines with thin-film Fe o.2Ni o.8 conductors. These lines demonstrate a power attenuation of 10 dB/cm at ferromagnetic resonance frequencies of 5 to 10 GHz for applied magnetic fields less than 80 kA/m (1 kOe)

Modification of Existing Welded Steel Moment Frame Connections for Seismic Resistance

May 1, 2001
Author(s)
John L. Gross, M D. Engelhardt, Chia-Ming Uang, K Kasai, N Iwankiw
The Congressional emergency appropriation resulting from the January 17, 1994, Northridge earthquake provided the Building and Fire Research Laboratory (BFRL) at the National Institute of Standards and Technology (NIST) an opportunity to expand its

Molecular Fluorescence in the Vicinity of a Nanoscopic Probe

May 1, 2001
Author(s)
H F. Hamann, M Kuno, Alan Gallagher, David Nesbitt
The dramatic modifications of molecular fluorescence in the proximity of a sharp nanoscopic probe is investigated by an apertureless or antenna-based near-field scanning optical microscope, which exploits the interactions between a fluorescent sample and a

Multiple Lateral Length Scales in Phase-Separating Thin Film Polymer Blends

May 1, 2001
Author(s)
Haonan Wang, R J. Composto, Erik K. Hobbie, Charles C. Han
The interplay of phase separation, preferential wetting, and capillary instability in thin film polymer blends is investigated using composition-profiling and surface-imaging techniques. The phase-separating films exhibit a unique morphology with two

NIST Serial Holdings 2001

May 1, 2001
Author(s)
Susan A. Sanders, S S. Edwards
This publication (23rd edition) contains bibliographic information on approximately 5,000 titles held in the NIST Research Library, representing current and noncurrent journals, periodicals, annuals, memoirs, proceedings, and transactions.

NIST Sparse BLAS User's Guide

May 1, 2001
Author(s)
K Remington, Roldan Pozo
This document provides a guide and reference manual for a portable numerical library for sparse matrix computations. These Basic Linear Algebra Subprograms (BLAS) provide kernelsfor forming sparse matrix products (of the form C = aAB + bC. where a and b

NIST: Responding to Basic Needs, Responding to Special Needs

May 1, 2001
Author(s)
L A. Greenhouse
The National Institute of Standards and Technology was established by an Act of Congress in 1901 as the National Bureau of Standards (NBS). It was charged with serving the Nation's science and industry by establishing and maintaining the fundamental

Open System Architecture for Real-time Control Using an UML Based Approach

May 1, 2001
Author(s)
Hui-Min Huang, Elena R. Messina, Harry A. Scott, James S. Albus, Frederick M. Proctor, William P. Shackleford
We describe a generic architecture that is applicable to the engineering of many real-time control problems. We further describe how UML is used to apply the architecture to the problems.

Orientation Imaging and Reorientation Dynamics of Single Dye Molecules

May 1, 2001
Author(s)
K D. Weston, Lori S. Goldner
Polarization modulation is used with confocal microscopy to measure the absorption dipole orientation and reorientation dynamics of individual dye molecules embedded in thin, spin-cast polymer films under ambient conditions. Both discrete and continuous
Displaying 45701 - 45725 of 73994
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