7,332 research outputs found
Comparison of selected submicron powder blending methods for dispersion alloys
Wet and dry blending nickel-aluminum oxide submicron powders for dispersion-strengthened alloy
Overlay copy technique to provide high-contrast electron micrographs for automatic metallographic analysis
Overlay copy technique to provide high-contrast electron micrographs for automatically determining quantitative microstructure of multiphase specimen
Recommended from our members
A tale of one city: intra-institutional variations in migrating VLE platform
City University London committed in 2009 to make Moodle the Virtual Learning Environment (VLE) at the core of a new Strategic Learning Environment (SLE) comprised of VLE, externally facing website and related systems such as video streaming and virtual classrooms. Previously, the WebCT VLE had been separate from most of the other systems at the institution with very limited connections to other tools. Each of the schools within the institution was able to pursue their own strategy and timeframe for the migration and embedding of Moodle within their subject areas, within an absolute limit of 2 years. This paper outlines the approaches taken by the various schools, highlighting similarities and differences, and draws out common aspects from the project to make recommendations for institutions seeking to undertake similar migrations
GRB Spikes Could Resolve Stars
GRBs vary more rapidly than any other known cosmological phenomena. The lower
limits of this variability have not yet been explored. Improvements in
detectors would reveal or limit the actual rate of short GRBs. Were microsecond
"spike" GRBs to exist and be detectable, they would time-resolve stellar mass
objects throughout the universe by their gravitational microlensing effect.
Analyzing the time structure of sufficient numbers of GRB spikes would reveal
or limit , , and/or .Comment: 18 pages, 2 figures, in press: ApJ (Letters
Sintering of Zinc Oxide
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/65859/1/j.1151-2916.1963.tb11774.x.pd
Connection Between Energy-dependent Lags And Peak Luminosity In Gamma-ray Bursts
We suggest a connection between the pulse paradigm at gamma-ray energies and
the recently demonstrated luminosity distribution in gamma-ray bursts: the
spectral evolution timescale of pulse structures is anticorrelated with peak
luminosity, and with quantities which might be expected to reflect the bulk
relativistic Lorentz factor, such as spectral hardness ratio. We establish this
relationship in two important burst samples using the cross-correlation lags
between low (25-50 keV) and high (100-300 keV and > 300 keV) energy bands. For
a set of seven bursts (six with redshifts) observed by CGRO/BATSE and BeppoSAX
which also have optical or radio counterparts, the gamma/X peak flux ratios and
peak luminosities are anti-correlated with spectral lag. For the 174 brightest
BATSE bursts with durations longer than 2 s and significant emission above 300
keV, a similar anti-correlation is evident between gamma-ray hardness ratio or
peak flux, and spectral lag. For the six bursts with redshifts, the connection
between peak luminosity and spectral lag is well-fitted by a power-law. GRB
980425 (if associated with SN 1998bw) would appear to extend this trend
qualitatively, but with a lag of ~ 4-5 s and luminosity of ~ 1.3x10^47 ergs
s^-1, it falls below the power-law relationship by a factor of ~ 460. As noted
previously by Band, most lags are concentrated on the short end of the lag
distribution, near 100 ms, suggesting that the GRB luminosity distribution is
peaked on its high end, e.g. N(L) proportional to L^beta, with positive beta.Comment: 25 pages + 6 figures, submitted to ApJ; Revised September 27, 1999
with additonal table, new versions of two figures, and revised text. The
anticorrelation originally Reported has been enhance
Elastic Buckling Under Combined Stresses of Flat Plates with Integral Waffle-like Stiffening
Theory and experiment were compared and found in good agreement for the elastic buckling under combined stresses of long flat plates with integral waffle-like stiffening in a variety of configurations. For such flat plates, 45 degree waffle stiffening was found to be the most effective of the configurations for the proportions considered over the widest range of combinations of compression and shear
Orbital flight effects on calcium kinetics and fracture healing Final report
Orbital flight effects on calcium kinetics and fracture healin
Local Government Risk Management Handbook
This handbook originated in a series of risk management workshops developed by the authors in 1980 as part of a special project in local government technology innovation at the University of Tennessee\u27s Municipal Technical Advisory Service. The workshops, funded in part by a grant from the National Science Foundation, were sufficiently well-received that the authors decided to expand workshop materials into a practical guide to assist local governments to establish and operate risk management programs. Initially, each of the three authors drafted specific chapters or sections for the Handbook. Dr. Dotterweich was responsible for writing sections on the concepts and principles of risk management, Dr. Sinclair for sections on insurance and departmental exposures and for many of the items in the Appendices, and Dr. Norris for sections on local government functions and departmental exposures. Dr. Norris also had overall responsibility for compiling and editing all sections into a single, hopefully coherent, manuscript. The manuscript was then reviewed by the authors with changes made where required. The result is a fully cooperative product which bears the imprimatur of all three authors, regardless of initial assignment
Practice analysis of certified public accountants: technical report
https://egrove.olemiss.edu/aicpa_assoc/1354/thumbnail.jp
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