34,760 research outputs found
Poverty and plenty: the divided American plate
What are the economic, social, political, community and individual actions needed to address short and long-term solutions of food insecurity and poverty? This paper will consider hunger and poverty terms, trends, health and nutrition impacts, as well as consider proposed local, regional, and national intervention solutions and strategie
Cryogenic, polar lunar observatories
In a geological vein, it is noted that some permanently shadowed regions on the Moon could provide natural passive cooling environments for astronomical detectors. A telescope located in one of the low, dark, polar regions could operate with only passive cooling at 40 K or perhaps lower, depending on how well it could be insulated from the ground and surrounded by radiation shields to block heat and light from any nearby warm or illuminated objects
Mechanical behavior of polycrystalline non-metallics at elevated temperature Progress report, 1 Oct. 1966 - 30 Mar. 1967
Creep analysis of polycrystalline sodium chloride in high temperature environment, and stress creep of sodium chloride-potassium chloride sample
Representation in Westminster in the 1990s : The ghost of Edmund Burke
Why are 'trustee' notions of representation still invoked in the UK House of Commons in the 1990s? In answering this question this article analyses the premises of Burkean theory and the arguments that these premises are of little relevance in the late twentieth century. Despite these dismissals of trusteeship, Burkean ideas are still articulated in the Commons some 200 years after they were first voiced. The idea of trusteeship can prove extremely useful to justify the actions of representatives when those actions conflict with constituency 'opinion', party policy or the wishes of interest groups. Examples of the occasions when Burkean notions have been invoked in the 1990s are provided
Mechanical Behavior of Polycrystalline Non- Metallics at Elevated Temperature Progress Report, 1 Oct. 1965 - 31 Mar. 1966
Creep tests and stress levels in determining mechanical behavior of polycrystalline nonmetallic materials at elevated temperature
Workshop on the Early Earth: The Interval from Accretion to the Older Archean
Presentation abstracts are compiled which address various issues in Earth developmental processes in the first one hundred million years. The session topics included: accretion of the Earth (processes accompanying immediately following the accretion, including core formation); impact records and other information from planets and the Moon relevant to early Earth history; isotopic patterns of the oldest rocks; and igneous, sedimentary, and metamorphic petrology of the oldest rocks
Mechanical behavior of polycrystalline non-metallics at elevated temperature Progress report, Apr. 1 - Sep. 30, 1965
Creep behavior of polycrystalline aluminum oxide and sodium chloride at high temperature
An extended soft-cube model for the thermal accommodation of gas atoms on solid surfaces
A numerical soft cube model was developed for calculating thermal accommodation coefficients alpha and trapping fractions f sub t for the interaction of gases incident upon solid surfaces. A semiempirical correction factor c which allows the calculation of alpha and f sub t when the collision times are long compared to the surface oscillator period were introduced. The processes of trapping, evaporation, and detailed balancing were discussed. The numerical method was designed to treat economically and with moderate (+ or - 20 percent) accuracy the dependence of alpha and f sub t on finite and different surface and gas temperatures for a large number of gas/surface combinations. Comparison was made with experiments of rare gases on tungsten and on alkalis, as well as one astrophysical case of H2 on graphite. The dependence of alpha on the soft cube dimensionless parameters is presented graphically
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