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weikaihere木蟲 (正式寫手)
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美國Northeastern University 結構工程方向博后招聘。 已有4人參與
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（Some comments：美國教授，年富力強，為人非常nice。學校地處Boston中心區(qū)，在經費如此短缺的今天，機不可失啊。） 特別聲明：Only applicants with with large-scale testing experience are considered. Sample Text: Renewable energy is critical to the long-term sustainability of the world. In particular, wind energy, a vast resource, has the potential to totally transform the worldwide energy economy. U.S. The U.S. Department of Energy (DOE) lists the development of renewable energy sources as an immediate national need, and has set a target for the U.S. to generate 20% of its electricity from wind energy by 2030. Currently, the United States generates ~3% of its electricity from wind energy, and it is clear that transformative advances in wind generated energy technology are vital to obtain the ambitious vision of the DOE. Specifically, wind turbine towers must be manufactured taller and cheaper. Keystone Tower Systems has developed an innovative manufacturing technology, based on automated spiral welding that enables conical, slender towers to be produced on-site in a highly efficient fashion. The benefits to this are two-fold: first, the automation reduces production costs dramatically compared to traditional practices and, second, the on-site fabrication precludes transport limits that currently inhibit both tower height and the structurally optimal distribution of material. An important barrier to the deployment of this technology is a lack of fundamental understanding of the limit states for this particular structure and, generally, for slender shells. To overcome this barrier, Northeastern University and Johns Hopkins University propose a program of fundamental analytical and experimental research into the limit states of and design standards for slender towers with particular emphasis on those manufactured with spiral welding. Existing design methods for slender towers and shells are unsatisfactory, relying on overly conservative, empirically derived knockdown factors, not having a firm probabilistic basis, and never having been applied to spiral welded pipe loaded in flexure. We propose to probabilistically characterize the controlling limit states of slender tubes and, based on this characterization, develop a rigorous reliability-based design approach. Directly coupled with this academic effort, KTS will develop and prototype its manufacturing process and imperfection assessment procedures with explicit consideration of the cost-benefit tradeoff between manufacturing tolerances and structural performance. 為防止垃圾郵件，有意者請先發(fā)CV至weikaihere@msn.com，索要詳細招聘信息。 [ Last edited by weikaihere on 2013-12-12 at 23:20 ] |
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