7,915 research outputs found

    Equilibrium route to colloidal gellation: mixtures of hard sphere-like colloids

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    The binodals and the non-ergodicity lines of a binary mixture of hard sphere-like particles with large size ratio are computed for studying the interplay between dynamic arrest and phase separation in depletion-driven colloidal mixtures. Contrarily to the case of hard core plus short range effective attraction, physical gellation without competition with the fluid-phase separation can occur in such mixtures. This behavior due to the oscillations in the depletion potential should concern all simple mixtures with non-ideal depletant, justifying further studies of their dynamic properties

    DPA on quasi delay insensitive asynchronous circuits: formalization and improvement

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    The purpose of this paper is to formally specify a flow devoted to the design of Differential Power Analysis (DPA) resistant QDI asynchronous circuits. The paper first proposes a formal modeling of the electrical signature of QDI asynchronous circuits. The DPA is then applied to the formal model in order to identify the source of leakage of this type of circuits. Finally, a complete design flow is specified to minimize the information leakage. The relevancy and efficiency of the approach is demonstrated using the design of an AES crypto-processor.Comment: Submitted on behalf of EDAA (http://www.edaa.com/

    The educational program in the national parks with particular reference to those in the western states

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    A series of radio broad casts over Station KGO, San Francisco, California, in the spring of 1935, first brought to my attention the great value of the National Parks in the field of adult education. Subsequently, in visiting some of the world\u27s greatest natural wonders, which are located in the National Parks in the western part of the United States, I have had the opportunity to observe some of the fine educational facilities made available to the visitor through the service of the park naturalists. The purpose of this thesis is to bring out the importance to the visitor of this educational service. It is my aim to present a clear picture of this educational work and to interpret the material gathered in the survey, and to comment on outstanding problems in this relatively new field of education. During the past five years, I have had the privilege of spending from one day to two weeks in each of the following National Parks: Bryce Canyon, Crater Lake, Glacier, Grand Canyon, Lassen Volcanic, Mesa Verde, Mount Rainier, Rocky Mountain, Sequoia, Yellowstone, Yosemite, Zion, and Kings Canyon . In 1935 I visited the Olympic Peninsula, and have been in the region which is now the Olympic National Park. A great deal of the material has been gathered by interviews with the naturalists in the various parks and from observations made by the writer. Therefore much of this information is not recorded in books or bulletin form. My interest in National Parks is of long standing, and it was rekindled in 1934 when the Post Office Department issued a series of postage stamps known as the National Park Series. In my opinion this was one of the most beautiful sets of stamps ever issued by our Government, and it has served to attract the attention of millions of our citizens t o the great natural resources controlled by our nation in the interest of all people. This novel way of calling attention to the most beautiful spots in America, the National Parks, the public\u27s playgrounds, has undoubtedly resulted in heightened interest in these regions and exerted a real influence in directing the travel habits of the American people

    James Sdrales and Virginia Zambukos v. Sam Rondos : Brief of Respondents

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    This paper deals with shape optimization for anisotropic elastoplasticity in logarithmic strain space. We aim to find an appropriate undeformed configuration of a workpiece knowing in advance its deformed configuration, the boundary conditions and the applied loads. The node coordinates of the finite element (FE) domain are chosen as design variables. A discrete sensitivity analysis is presented and analytical gradients are performed. A numerical example illustrates the theoretical aspects
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