17,437 research outputs found
Statement of Clifford J. Ehrlich Before the Commission on the Future of Worker-Management Relations
Testimony_Ehrlich_022494.pdf: 352 downloads, before Oct. 1, 2020
Electrolysis cell functions as water vapor dehumidifier and oxygen generator
Water vapor is absorbed in hygroscopic electrolyte, and oxygen generated by absorbed water electrolysis at anode is added simultaneously to air stream. Cell applications include on-board aircraft oxygen systems, portable oxygen generators, oxygen concentration requirements, and commercial air conditioning and dehumidifying systems
COVIDâ19 and competitive markets of securitisation
No description supplie
Not My Church! (Chapter 5 of Grappling With Faith: Decision Cases for Christians in Social Work)
You\u27re not acting as my church acts! church social worker Sandy Potts exclaimed. In fact, you\u27re not acting as His church would act!
Peter Wilson, Senior Executive Director of Creekside Christian Church, and Rita Kimball, an assistant from human resources had just informed Sandy that she was being terminated. They had given the same news to others on the church staff as they met at fifteen minute intervals; another pair of administrators was doing the same in an adjoining room
The great asteroid nomenclature controversy of 1801
With the almost complete neglect of 19th century asteroid research by professional historians of science, it is scarcely surprising that great gaps exist in our knowledge of that important field. This paper focuses on issue of naming the first asteroid. This seemingly innocuous issue assumed great importance because many believed the object discovered by Giuseppe Piazzi at Palermo Observatory to be the eighth primary planet of the solar system
Boundary layer flow visualization for flight testing
Flow visualization is used extensively in flight testing to determine aerodynamic characteristics such as surface flow direction and boundary layer state. Several visualization techniques are available to the aerodynamicist. Two of the most popular are oil flows and sublimating chemicals. Oil is used to visualize boundary layer transition, shock wave location, regions of separated flow, and surface flow direction. Boundary layer transition can also be visualized with sublimating chemicals. A summary of these two techniques is discussed, and the use of sublimating chemicals is examined in some detail. The different modes of boundary layer transition are characterized by different patterns in the sublimating chemical coating. The discussion includes interpretation of these chemical patterns and the temperature and velocity operating limitations of the chemical substances. Information for selection of appropriate chemicals for a desired set of flight conditions is provided
Post-Newtonian constraints on f(R) cosmologies in metric formalism
We compute the complete post-Newtonian limit of the metric form of f(R)
gravities using a scalar-tensor representation. By comparing the predictions of
these theories with laboratory and solar system experiments, we find a set of
inequalities that any lagrangian f(R) must satisfy. The constraints imposed by
those inequalities allow us to find explicit bounds to the possible nonlinear
terms of the lagrangian. We conclude that the lagrangian f(R) must be almost
linear in R and that corrections that grow at low curvatures are incompatible
with observations. This result shows that modifications of gravity at very low
cosmic densities cannot be responsible for the observed cosmic speed-up.Comment: 10 pages, no figures, revtex
Quasiconformal variation of slit domains
We use quasiconformal variations to study Riemann mappings
onto variable single slit domains when the slit is the tail of an appropriately
smooth Jordan arc. In the real analytic case our results answer a question of
Dieter Gaier and show that the function Îș in Löwner's differential equation is
real analytic
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Detecting and correcting errors in ruled-based expert systems : an integration of empirical and explanation-based learning
In this paper, we argue that techniques proposed for combining empirical and explanation-based learning methods can also be used to detect errors in rule-based expert systems, to isolate the blame for these errors to a small number of rules and suggest revisions to the rules to eliminate these errors. We demonstrate that FOCL, an extension to Quinlan's FOIL program, can learn in spite of an incorrect domain theory (e.g., a knowledge base of an expert system that contains some erroneous rules). A prototype knowledge acquisition tool, KR-FOCL, has been constructed that can utilize a trace of FOCL to suggest revisions to a rule base
Roughness and waviness requirements for laminar flow surfaces
Many modern metal and composite airframe manufacturing techniques can provide surface smoothness which is compatible with natural laminar flow (NLF) requirements. An important consideration is manufacturing roughness of the surface in the form of steps and gaps perpendicular to the freestream. The principal challenge to the design and manufacture of laminar flow surfaces today appears to be in the installation of leading-edge panels on wing, nacelle, and empennage surfaces. A similar challenge is in the installation of access panels, doors, windows, fuselage noses, and engine nacelles. Past work on roughness and waviness manufacturing tolerances and comparisons with more recent experiments are reviewed
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