6,466 research outputs found

    CERTIFICATION SCHEMES FOR BIOFUEL SUSTAINABILITY WILL NOT WORK

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    Biofuel, Certification, Sustainability, Deforestation, Food Prices, Ethanol, Biodiesel, Resource /Energy Economics and Policy, O13,

    DEVELOPING EXTENSION PROGRAMS USING FOREIGN STUDY MATERIAL

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    Teaching/Communication/Extension/Profession,

    USING TELEVISION IN PUBLIC POLICY EXTENSION WORK

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    Teaching/Communication/Extension/Profession,

    Two HSCT Mach 1.7 low sonic boom designs

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    The objective of this study was to provide low sonic boom concepts, geometry, and analysis to support wind tunnel model designs. Within guidelines provided by NASA, two High Speed Civil Transport (HSCT) configurations were defined with reduced sonic boom that have low drag, high payload, and good performance. To provide information for assessing the feasibility of reduced sonic boom operation, the two designs were analyzed in terms of their sonic boom characteristics, as well as aerodynamics, weight and balance, and performance characteristics. Low drag and high payload were achieved, but both of the blended arrow-wing configurations have deficiencies in high lift capability, fuel volume, wing loading, balance, and takeoff gross weight. Further refinement of the designs is needed to better determine the commercial viability of low boom operation. To help in assessing low boom design technology, the two configurations were defined as wind tunnel models with altered aft-bodies for the wind tunnel sting mounting system

    G07-1523 Low Toxic Cockroach Control

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    This NebGuide describes how to identify common cockroach species, what they need to survive, and effective, low-toxic alternatives to traditional chemical control options

    Twists of Shimura Curves

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    Consider a Shimura curve X0D(N)X^D_0(N) over the rational numbers. We determine criteria for the twist by an Atkin-Lehner involution to have points over a local field. As a corollary we give a new proof of the theorem of Jordan-Livn\'e on Qp\mathbf{Q}_p points when pDp\mid D and for the first time give criteria for Qp\mathbf{Q}_p points when pNp\mid N. We also give congruence conditions for roots modulo pp of Hilbert class polynomials.Comment: Slight updat

    Decoupling Farm Payments: Experience in the U.S., Canada, and Europe

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    Commodity payments in Europe and North America are production based, encouraging greater chemical use and cropping area. Thus, each region undermines the other’s price supports at the expense of the environment. Countries can, however, sever the link between yield levels and payments. Allowing farmers to exit agriculture poses challenges for the US, but perhaps not for Canada and the EU.decoupling, liberalizing trade, environment, flexibility
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