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دسته بندی : مقاله های انگلیسی فایل : pdf زبان مقاله : انگلیسی تعداد صفحه : 8 رشته مقاله : شیمی نوع مقاله : علمی مقدمه :Although explosive studies on pursuing high-performance Pt-based nanomaterials for the fuel cell reactions have been carried out, the combined controls of surface composition, exposed facet and interior structure of the catalyst remains formidable challenge. We demonstrate herein a facile chemical approach to realize a new class of intermetallic Pt-Pb-Ni octahedra f ...
391 صفحه PDF کتاب Metal Based Thin Films for Electronics WILEY-VCH GmbH & Co. KGaA,Weinheim 2003 Klaus Wetzig, Claus M. Schneider ...
FORMULAS AND CHARTS FOR IMPEDANCES OF SURFACE AND EMBEDDED FOUNDATIONS Abstract A complete set of algebraic formulas and dimensionless charts is presented for readily computing the dynamic stiffnesses (K) and damping coefficients (C) of foundations harmonically oscillating on/in a homogeneous half‐space. All possible modes of vibration, a realistic range of Poisson's ratios, and a practically sufficient range of oscillation frequencies are considered. The foundations have a rigid basema ...
A MACRO-ELEMENT FOR DYNAMIC SOIL-STRUCTURE INTERACTION ANALYSES OF SHALLOW FOUNDATIONS Abstract The scope of the paper is to present some aspects of the development of a "macro-element" for dynamic soil-structure interaction analyses of shallow foundations. Initially the concept of "macro-element" is introduced and is illustrated with the aid of a very simple example originating from structural engineering. Then the link is made with the modeling of the dynamic response of shallow foundat ...