881 resultados para 867


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主要从岩石学,矿物学,岩石分类,C,O,Sr同位素,碳酸岩与矿化的关系等各方面对(碱性)碳酸岩的研究进行了较为全面的总结,并结合近20年来实验岩石等,流体包裹体研究,CO2^- H2O-NaCl流体体系的性质的研究,对碳酸岩岩浆的来源及成因,岩浆-热液的演化进行了分析和探讨,碳酸岩形成至少经历了三个阶段,即岩浆阶段,岩浆期后阶段(气相碳酸岩/岩浆热液阶段),交代碳酸岩阶段,而作为与碳酸岩在空间和成因上有密切联系的基性,超基性岩,碱性岩杂岩体,则经历了碳酸岩成岩阶段以前的岩浆不混熔作用,结晶分异作用,岩浆结晶作用以及碳酸岩形成之后的围岩蚀变(霓长岩化)作用.

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Borsay, Peter, 'New Approaches to Social History. Myth, Memory and Place: Monmouth and Bath 1750-1900', Journal of Social History (2006) 39(3) pp.867-889 RAE2008

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Second letter to nephew, Daniel Avery Whedon from Daniel D. Whedon dated May 16, 1881.

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Handwritten letter from Daniel D. Whedon to nephew, Daniel Avery Whedon. Dated November 30, 1881.

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Letter from Daniel D. Whedon to nephew. One of two dated May 16, 1881.

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Three page handwritten letter to nephew, Daniel Avery Whedon, from Daniel D. Whedon. Dated 11/14/1881.

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January 13 1868 letter from Daniel A. Whedon to nephew.

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Letter from Daniel Whedon to nephew, Daneil Avery Whedon. Dated December 11 1868.

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Handwritten letter dated June 7, 1881, to nephew, Daniel Avery Whedon.

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Daniel Avery Whedon's four page letter to nephew, dated October 10, 1867.

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Hanwritten letter from Daniel Denison Whedon to nephew. Dated 08/09/1867.

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In this paper, we consider the problem of providing flexibility to solutions of two-machine shop scheduling problems. We use the concept of group-scheduling to characterize a whole set of schedules so as to provide more choice to the decision-maker at any decision point. A group-schedule is a sequence of groups of permutable operations defined on each machine where each group is such that any permutation of the operations inside the group leads to a feasible schedule. Flexibility of a solution and its makespan are often conflicting, thus we search for a compromise between a low number of groups and a small value of makespan. We resolve the complexity status of the relevant problems for the two-machine flow shop, job shop and open shop. A number of approximation algorithms are developed and their worst-case performance is analyzed. For the flow shop, an effective heuristic algorithm is proposed and the results of computational experiments are reported.

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Evaluating ship layout for human factors (HF) issues using simulation software such as maritimeEXODUS can be a long and complex process. The analysis requires the identification of relevant evaluation scenarios; encompassing evacuation and normal operations; the development of appropriate measures which can be used to gauge the performance of crew and vessel and finally; the interpretation of considerable simulation data. Currently, the only agreed guidelines for evaluating HFs performance of ship design relate to evacuation and so conclusions drawn concerning the overall suitability of a ship design by one naval architect can be quite different from those of another. The complexity of the task grows as the size and complexity of the vessel increases and as the number and type of evaluation scenarios considered increases. Equally, it can be extremely difficult for fleet operators to set HFs design objectives for new vessel concepts. The challenge for naval architects is to develop a procedure that allows both accurate and rapid assessment of HFs issues associated with vessel layout and crew operating procedures. In this paper we present a systematic and transparent methodology for assessing the HF performance of ship design which is both discriminating and diagnostic. The methodology is demonstrated using two variants of a hypothetical naval ship.