9,570 research outputs found

    The Future of Charge Card Networks

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    The general-purpose charge card is now ubiquitous and largely taken for granted. Annual charge card volume exceeds $5 trillion worldwide. Within the United States, nearly one billion cards are in use (about eight per household), and more than two billion worldwide. But charge cards, or more specifically, the cooperative networks that serve the largest card systems, Visa and MasterCard, are under legal attack through multiple lawsuits and under regulatory challenge in other countries. We trace in this essay multiple possible future 'scenarios'. This focus on possible futures distinguishes our work from many earlier studies of this subject.

    Gas chromatograph injection system

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    An injection system for a gas chromatograph is described which uses a small injector chamber (available in various configurations). The sample is placed in the chamber while the chamber is not under pressure and is not heated, and there is no chance of leakage caused by either pressure or heat. It is injected into the apparatus by changing the position of a valve and heating the chamber, and is volatilized and swept by a carrier gas into the analysis apparatus

    High-performance thermionic converter Quarterly progress report, 13 Aug. - 13 Nov. 1965

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    Fabrication and testing of cesium loaded thermionic converter test vehicl

    Permutation sampling in Path Integral Monte Carlo

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    A simple algorithm is described to sample permutations of identical particles in Path Integral Monte Carlo (PIMC) simulations of continuum many-body systems. The sampling strategy illustrated here is fairly general, and can be easily incorporated in any PIMC implementation based on the staging algorithm. Although it is similar in spirit to an existing prescription, it differs from it in some key aspects. It allows one to sample permutations efficiently, even if long paths (e.g., hundreds, or thousands of slices) are needed. We illustrate its effectiveness by presenting results of a PIMC calculation of thermodynamic properties of superfluid Helium-four, in which a very simple approximation for the high-temperature density matrix was utilized

    Marginalization and the Occasional Teacher Workforce in Ontario: The Case of Internationally Educated Teachers (IETs)

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    This article considers the marginalization of internationally educated teachers (IETs) as occasional teachers. In particular, it explores the experiences of three IETs as they try to gain access to full-time teacher employment within the Ontario, English-speaking public school system. Data used in this article was generated from a qualitative study of occasional teachers who worked in the Ontario English-speaking public school system. Findings indicated that these teachers engaged in considerable amounts of unpaid work, participated in a great deal of informal and formal learning, and accepted all and any occasional work available – all practices associated with the cycle of marginalization
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