32,252 research outputs found

    Quasi-adiabatic Switching for Metal-Island Quantum-dot Cellular Automata

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    Recent experiments have demonstrated a working cell suitable for implementing the Quantum-dot Cellular Automata (QCA) paradigm. These experiments have been performed using metal island clusters. The most promising approach to QCA operation involves quasi-adiabatically switching the cells. This has been analyzed extensively in gated semiconductor cells. Here we present a metal island cell structure that makes quasi-adiabatic switching possible. We show how this permits quasi-adiabatic clocking, and enables a pipelined architecture.Comment: 40 preprint-style double-spaced pages including 16 figure

    How Parents Use Time and Money

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    [Excerpt] This article examines weekday resource allocation decisions of married couples with a husband employed full time and with children under 18. These decisions relate, among other things, to working for pay; doing unpaid household work; purchasing services such as childcare, laundry and drycleaning, and food away from home; and eating out. Information about spending decisions was obtained from the 2009 Consumer Expenditure Survey (CE) and information about time use was obtained from the 2009 American Time Use Survey (ATUS). Results show that, Regardless of employment status, wives were more likely than husbands to spend time in household activities. On an average weekday, married fathers spent more time working than married mothers did, even married mothers employed full time. The proportion of families reporting childcare expenses and the average amount spent by those reporting were highest for families with full-time working wives and lowest for families with wives not employed for pay. Consistent with other research, working-wife families did not spend more on housekeeping and laundry services than did families with wives not employed for pay. Families with full-time working wives spent the greatest dollar amount on food away from home, but there was no significant difference in spending between families with part-time working wives and families with wives not employed for pay

    An Annotated Checklist of Wisconsin Mutillidae (Hymenoptera)

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    A survey of Wisconsin velvet ants (Hymenoptera: Mutillidae) conducted from literature searches, collection inventories, and two years of field work (2001-2002) yielded 28 species in three subfamilies. Of these, 23 species (representing 82% of the Wisconsin fauna and a 460% increase in the known species richness) are new state species records, having not previously been recorded in the published literature from the state. The known distributions of all Wisconsin species are reported by region and county, along with pertinent phenological, natural history, and other collection information, when known
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