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Displaying 47676 - 47700 of 73830

Microcalorimeter Energy-Dispersive Spectrometry Using a Low Voltage Scanning Electron Microscope

July 1, 2000
Author(s)
David A. Wollman, Sae Woo Nam, Gene C. Hilton, Kent D. Irwin, Norman F. Bergren, David A. Rudman, John M. Martinis, Dale Newbury
We describe the current performance of the prototype microcalorimeter energy-dispersive spectrometer (5cal EDS) developed at NIST for X-ray microanalysis. We show that the low-energy 5cal EDS, designed for operation in the energy range 0.2-2 keV, offers

Microsegregation in Peltier Interface Demarcation

July 1, 2000
Author(s)
Y Dabo, H N. Thi, Sam R. Coriell, Geoffrey B. McFadden, Q Li, B Billia
Experimental results on solute microsegregation induced by Peltier Interface Demarcation (PID) technique during directional solidification of Bi-1 wt % Sb alloys are presented. These data are compared with the results of numerical simulation and the theory

Microwave Detection of Stress Induced Farigue Cracks in Steel and Potential of Crack Opening Determination Using a New Phase Sensitive Approach Based on a Waveguide Magic TEE

July 1, 2000
Author(s)
N Qaddoumi, E Ranu, R Zoughi, Joseph D. McColskey
Detection and evaluation of surface cracks in metals is an important facet of nondestructive testing and evaluation (NDT&E). Cracks in bridges, aircraft wings and other metal structures can pose serious danger to the structure and ultimately human lives

Mining Usability Information from Log Files: A Multi-Pronged Approach

July 1, 2000
Author(s)
Michelle P. Steves, Emile L. Morse
This is a position paper for a workshop concerned with issues and experiences surrounding logged data for on-line communities. We briefly describe relevant elements of a field study of a group of welding engineers using a collaborative system conducted at

Modeling Requirements for Self-integrating Manufacturing Systems

July 1, 2000
Author(s)
Peter O. Denno
This paper discusses modeling requirements to support self-integrating manufacturing systems. Business process re-engineering, as it is currently performed, is driven by the same information as may drive the re-engineering process of future self

Monitoring and Controlling Operations

July 1, 2000
Author(s)
Albert T. Jones, Evan K. Wallace, Yuehwern Yih
This work is a chapter in a forthcoming Handbook of Industrial Engineering. The chapter contains five sections. In addition to a short introduction and a shorter summary, this paper has three technical sections. The first section talks about control

NCSL Pressure Comparison At 0.69 Mpa (100 psi) and 1.4 Mpa (200 psi)

July 1, 2000
Author(s)
Robert G. Driver, James W. Schmidt
The pressure and Vacuum Group at NIST has piloted a pressure comparison under the auspices of the Measurement comparison program committee for the NCSL. A 1.4 MPa (~200 psi)transducer package used as a transfer standard was circulated among 20 domestic

Ni(ll) Specifically Cleaves the C-Terminal Tail of the Major Variant of Histone H2A and Forms an Oxidative Damage-Mediating Complex with the Cleaved-Off Octapeptide

July 1, 2000
Author(s)
W Bal, R Liang, J Lukszo, S Lee, M. Dizdaroglu, K S. Kasprzak
The Acetyl-TESHHK-amide peptide, modeling a part of the C-terminal tailof histone H2A, was found previously by us to undergo at pH 7.4 a Ni(II)-assisted hydrolysis of the E-S peptide bond with formation of a stronger Ni(II) complex with the SHHK-amide

Numerical Evaluation of Diffraction Integrals

July 1, 2000
Author(s)
Klaus Mielenz
This paper describes a simple numerical integration method for diffraction integrals which is based on elementary geometrical considerations of the manner in which different portions of the incident wavefront contribute to the diffracted field. The method

Performance of Precast Concrete Shear Walls

July 1, 2000
Author(s)
A E. Schultz, Geraldine Cheok, R A. Magana
An experimental program is undertaken to enhance the knowledge base regarding seismic design of precast concrete shear walls. The emulation design and jointed design philosophies are described, and an idealization of the behavior of precast shear walls is

Performance of R-22 And Its Alternatives Working At High Outdoor Temperatures

July 1, 2000
Author(s)
S F. Yana Motta, Piotr A. Domanski
This paper examines the performance of R-22 and its possible replacements in an air-cooled air conditioner. The study focuses on the effect ofelevated outdoor temperatures on system capacity and Coefficient of Performance (COP). The refrigerants considered

Plasma Oscillations and Expansion of an Ultracold Neutral Plasma

July 1, 2000
Author(s)
S Kulin, T C. Killian, S D. Bergeson, S L. Rolston
We report the observation of plasma oscillations in an ultracold neutral plasma. Using this collective mode, we probe the electron density distribution and study the expansion of the plasma as a function of time. For classical plasma conditions, i.e. weak

Polarized Light-Scattering Measurements of Polished and Etched Steel Surfaces

July 1, 2000
Author(s)
Thomas A. Germer, T Rinder, HT Rothe
The directional dependence of the intensity and polarization of light scattered by a series of steel surfaces was measured. The samples differ by polishing procedure. Theories for light scattering from microroughness and permittivity variations are

Proposed Bullet Signature Comparisons Using Autocorrelation Functions

July 1, 2000
Author(s)
Jun-Feng Song, Theodore V. Vorburger
The National Institute of Standards and Technology (NIST) standard bullets and casings are intended as reference standards for crime laboratories to help verify that the computerized optical-imaging equipment in those laboratories is operating properly

Quantum dot semiconductor optical amplifiers

July 1, 2000
Author(s)
Richard P. Mirin, D. J. Blumenthal
A new traveling-wave semiconductor optical amplifier using self-assembled quantum dots as the gain medium is proposed and analyzed. Cross-gain modulation is greatly reduced when the quantum dots are electronically uncoupled.

Report on NIST-NACLA MOU Workshop

July 1, 2000
Author(s)
W G. Leight
In accordance with a notice published in the Federal Register, a workshop was conducted on June 23, 2000, at the National Institute of Standards and Technology (NIST) to obtain public comment on a proposed Memorandum of Understanding (MOU) between NIST and

Representation of Heterogeneous Objects in ISO 10303 (STEP)

July 1, 2000
Author(s)
Lalit Patil, D Dutta, Amba D. Bhatt, Kevin K. Jurrens, Kevin W. Lyons, Mike Pratt, Ram D. Sriram
Solid modeling of objects forms an important task in design and manufacturing. Recent developments in the field of layered manufacturing have shown potential for the physical realization of heterogeneous (multi-material) objects. Thus, there is a need to

Representing an Artifact Transport System in a Design Repository: A Case Study

July 1, 2000
Author(s)
Robert Allen, Ram D. Sriram, Simon Szykman, Robert J. Fijol
We report on a case study representing the design essence of a prototype ultra-high vacuum artifact transport system (ATS) in an existing design repository (DR). Specifically, we represent engineering geometry, function and assosiated behavior, as well as

Response Saturation of Polystyrene in MALDI

July 1, 2000
Author(s)
R J. Goldschmidt, Charles M. Guttman
For synthetic polymer samples, matrix-assisted laser desorption/ionization (MALDI) time-of-Flight (TOF) mass spectrometry (MS) can yield qualitative information about end groups and repeat units, and also quantitative information, such as molecular masses
Displaying 47676 - 47700 of 73830
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