4,134 research outputs found
Liberalisation and political decay : Sri Lanka's journey from welfare state to a brutalised society
economic recession;economic liberalization;Sri Lanka;political conditions
Eclipse radius measurements
Methods for predicting the path edges and reducing observations of total solar eclipses for determining variations of the solar radius are described. Analyzed observations of the 1925 January eclipse show a 0.7 (arc second) decrease in the solar radius during the past fifty years
AUTOSIM: An automated repetitive software testing tool
AUTOSIM is a software tool which automates the repetitive run testing of software. This tool executes programming tasks previously performed by a programmer with one year of programming experience. Use of the AUTOSIM tool requires a knowledge base containing information about known faults, code fixes, and the fault diagnosis-correction process. AUTOSIM can be considered as an expert system which replaces a low level of programming expertise. Reference information about the design and implementation of the AUTOSIM software test tool provides flowcharts to assist in maintaining the software code and a description of how to use the tool
Study of explosions in the NASA-MSC Vibration and Acoustic Test Facility /VATF/ Final report
Damage potential of titanium alloy pressure spheres relative to spacecraft vibration testin
An examination of selected characteristics contributing to well-being among married women at midlife and married younger adult women
The biologizing of the life course presents a regressive view of women\u27s lives that appears to be in stark contrast with the perceptions reported by many women at midlife today. Not only can women at midlife today expect to live another 40 years after their last child leaves home, but many claim they have never felt so healthy or so full of energy in their lives, and that they are just reaching their prime. These claims raise the question of just what it is that explains this difference in understandings about the years between young adulthood and old age;The purpose of this study was to expand previous understandings of women\u27s lives by meeting two objectives. The first objective was to describe married women at midlife using a broad range of selected variables that have increasingly come to be used in sociological and psychological literature to define well-being. The second objective was to compare married women at midlife with married younger adult women using the same range of variables;By far the most important implication of this study is that it is both possible and important to understand women\u27s lives as a complex of multi-dimensional and positive characteristics. Because of the complexity of individual lives across the life course, further research involving statistical approaches that can handle multiple variables and that can discern complex interactions needs to be done
Cold electron beams from cryo-cooled, alkali antimonide photocathodes
In this letter we report on the generation of cold electron beams using a
Cs3Sb photocathode grown by co-deposition of Sb and Cs. By cooling the
photocathode to 90 K we demonstrate a significant reduction in the mean
transverse energy validating the long standing speculation that the lattice
temperature contribution limits the mean transverse energy or thermal emittance
near the photoemission threshold, opening new frontiers in generating
ultra-bright beams. At 90 K, we achieve a record low thermal emittance of 0.2
m (rms) per mm of laser spot diameter from an ultrafast (sub-picosecond)
photocathode with quantum efficiency greater than using a
visible laser wavelength of 690 nm
Evaluation of out-of-core computer programs for the solution of symmetric banded linear equations
FORTRAN coded out-of-core equation solvers that solve using direct methods symmetric banded systems of simultaneous algebraic equations. Banded, frontal and column (skyline) solvers were studied as well as solvers that can partition the working area and thus could fit into any available core. Comparison timings are presented for several typical two dimensional and three dimensional continuum type grids of elements with and without midside nodes. Extensive conclusions are also given
Vacancy assisted arsenic diffusion and time dependent clustering effects in silicon
We present results of kinetic lattice Monte Carlo (KLMC) simulations of
substitutional arsenic diffusion in silicon mediated by lattice vacancies.
Large systems are considered, with 1000 dopant atoms and long range \textit{ab
initio} interactions, to the 18th nearest lattice neighbor, and the diffusivity
of each defect species over time is calculated. The concentration of vacancies
is greater than equilibrium concentrations in order to simulate conditions
shortly after ion implantation. A previously unreported time dependence in the
applicability of the pair diffusion model, even at low temperatures, is
demonstrated. Additionally, long range interactions are shown to be of critical
importance in KLMC simulations; when shorter interaction ranges are considered
only clusters composed entirely of vacancies form. An increase in arsenic
diffusivity for arsenic concentrations up to is
observed, along with a decrease in arsenic diffusivity for higher arsenic
concentrations, due to the formation of arsenic dominated clusters. Finally,
the effect of vacancy concentration on diffusivity and clustering is studied,
and increasing vacancy concentration is found to lead to a greater number of
clusters, more defects per cluster, and a greater vacancy fraction within the
clusters.Comment: 22 pages, 16 figure
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