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对半潜式钻井平台的建造方法、合拢工艺进行了综述,并指出了这些工艺方法的不足.在综合各建造工艺优缺点的基础上,基于“平地造船”的思想,提出了一种新的建造工艺.该工艺是以总起重量达2万吨的世界第一桥式起重机一“泰山”为核心,平台采用巨型分段建造和舾装,最后利用2万吨起重机整体合拢完成的工艺.该工艺真正实现了平地造船的思想,实践证明,该起重机的投入使用,使得半潜式钻井平台建造工艺得到革新,对整个海洋工程领域将产生积极影响和促进作用. 相似文献
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介绍了滨海路下立交桥空心极梁施工中的模板工艺和预应力张拉工艺,总结了本工程的施工经验、体会和特殊情况下的处理措施,可为同类工程施工所借鉴。 相似文献
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本文主要介绍对X射线组合折射透镜的制作工艺误差对其聚焦性能影响的研究结果. 首先给出采用深度X射线光刻技术制作的PMMA材料圆柱面型X组合折射透镜的工艺测试结果,得出制作工艺误差值,定性分析制作工艺误差对X射线组合折射透镜聚焦性能的影响. 然后根据实际的制作工艺误差建模,给出详尽的理论分析和定量的理论模拟结果. 最后在北京同步辐射装置(BSRF)上,构建基于PMMA材料的圆柱面型X射线组合折射透镜的微束聚焦实验系统,实际测试了有明显工艺误差和尽量消除工艺误差的两种X射线组合折射透镜的聚焦性能,给出实测结果 相似文献
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本文通过凤眼莲等水生植物对含银废水的净化与资源化的生产性应用试验,提出了工程实施的基本工艺,阐述了该工艺方案的特点和运行控制要求,分析了这一废水净化与资源化生态工程的环境效益和经济效益。这对我国感光材料工业和其它有关行业净化低浓度含银废水,并从中回收白银具有重要的意义。 相似文献
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目的：采用现代制剂工艺技术与科学评价方法,将补肝健腰方由传统汤剂开发为颗粒剂,优化制备工艺并建立制剂的专属质量标准。方法：通过多因素试验优选最佳工艺条件,确定制剂的提取、成型工艺;采用TLC鉴别方法对方中代表性药味进行定性鉴别。结果：优选了剂型及制剂工艺,建立了产品质量标准,按确定的工艺参数进行验证试验,各项指标均符合要求,表明该工艺及质量标准稳定可行。结论：新制剂较原方汤剂而言,具有储存运输与服用方便、稳定性好、质量可控、有效期长且药效显著等特点,为制剂的产业化提供了科学依据。 相似文献
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目的：基于质量源于设计（QbD）理念对肺复方颗粒醇提工艺进行研究与优化。方法：以固体物质提取量、重楼总皂苷提取量为关键质量属性（CQAs）,采用单因素和正交试验筛选潜在关键工艺参数（CPPs）,通过Box-Behnken设计建立模型,考察关键工艺参数与关键质量属性之间的交叉作用,并建立肺复方颗粒醇提工艺的设计空间及空间优化。结果：方差分析结果显示所建模型具有统计学意义（P＜0.05或P<0.01）,各因素与响应值之间可用所建模型进行函数化。通过设计空间优化得到肺复方颗粒最佳醇提工艺为：提取2次,提取时间为2 h/次,加75%乙醇6～6.8倍。结论：基于QbD理念研究和开发的肺复方颗粒醇提工艺稳定、可靠,为其制剂的工艺开发及质量控制提供了参考。 相似文献
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描述了胜利埕岛油田所在海域全年各季风、浪、潮汐、海流等的基本状况、产生机理及黄河三角洲区域对它们的影响。同时介绍了目前国内在深水及浅水区域几种海底电缆的铺设工艺 ,从施工机械到水动力学原理的角度 ,对其应用进行了技术上的分析 ,指出了每种施工工艺的优劣 ,并由此确定了较为理想的电缆埋设工艺和定位技术方案 ,使电缆铺设实际长度误差控制在设计长度的 1 %范围内 ,从而大大节省了工程投资费用。该工艺的选择和推广可为埕岛海上油田的开发创造较好的经济效益。 相似文献
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Steady-state heat conduction problems arisen in connection with various physical and engineering problems where the functions satisfy a given partial differential equation and particular boundary conditions, have attracted much attention and research recently. These problems are independent of time and involve only space coordinates, as in Poisson's equation or the Laplace equation with Dirichlet, Neuman, or mixed conditions. When the problems are too complex, it is difficult to find an analytical solution, the only choice left is an approximate numerical solution. This paper deals with the numerical solution of three-dimensional steady-state heat conduction problems using the meshless reproducing kernel particle method (RKPM). A variational method is used to obtain the discrete equations. The essential boundary conditions are enforced by the penalty method. The effectiveness of RKPM for three-dimensional steady-state heat conduction problems is investigated by two numerical examples. 相似文献
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从环境岩土工程学的角度出发，对由于大量开采地下水造成的环境工程地质问题和环境水文地质问题而造成的地面沉降和塌陷、水资源短缺、水质污染及海水入侵等不良后果进行了较为全面的论述，并就各种问题的防治提出了综合措施。 相似文献
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滨海旅游发展现状及对策思索 总被引：14，自引：0，他引：14
滨海地区是全球主要的旅游地,滨海旅游是一种非常受欢迎的旅游方式.在滨海旅游的蓬勃发展中,也存在不少问题.就全球滨海旅游的布局、滨海旅游发展中存在的问题进行了分析,并提出了相应的解决措施. 相似文献
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Inspired by Rittel and Webber [Dilemmas in a general theory of planning. Policy Sciences 1973;4:155–69], it is argued that fisheries and coastal governance is confronted with problems that are inherently “wicked.” Problems are wicked (as opposed to “tame”) when they are difficult to define and delineate from other and bigger problems and when they are not solved once and for all but tend to reappear. Wicked problems have no technical solution, it is not clear when they are solved, and they have no right or wrong solution that can be determined scientifically. Instead, for wicked problems governance must rely on the collective judgment of stakeholders involved in a process that is experiential, interactive and deliberative. In this paper, the wicked problem is identified as a governability issue, recognizing that there are limitations to how rational and effective fisheries and coastal governance can possibly be. The paper offers a framework which could help us locate the wicked problems within the fisheries and coastal governance system, as well as examine their governability. 相似文献
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简要分析、总结了我国近 1 0 a来的主要海水鱼、虾、贝、藻等的增养殖现状和存在的问题 ,并对今后可持续发展问题进行了探讨 相似文献
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Ocean current forecasting is still in explorative stage of study. In the study, we face some problems that have not been met before. The solving of these problems has become fundamental premise for realizing the ocean current forecasting. In the present paper are discussed in depth the physical essence for such basic problems as the predictability of ocean current, the predictable currents, the dynamical basis for studying respectively the tidal current and circulation, the necessity of boundary model, the models on regions with different scales and their link. The foundations and plans to solve the problems are demonstrated. Finally a set of operational numerical forecasting system for ocean current is proposed. 相似文献
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青岛地区的环境水文地质问题及其防治对策 总被引：2，自引：0，他引：2
随着工农业的发展,围绕水资源的开发利用而产生的环境水文地质问题,日益向广度和深度发展。青岛地区近年来产生的环境水文地质问题主要有:地下水超采造成的区域性水位下降、海水入侵及地下水污染。另外,部分地区存在原生环境水文地质问题之一——地方性氟病。本文试就这些问题出现的原因、发展程度、防治措施及进一步的研究方向,作了一些有益的探讨。 相似文献
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The parabolic equation method provides an excellent combination of accuracy and efficiency for range-dependent ocean-acoustics and seismology problems. This approach is highly developed for problems in which the ocean bottom can be modeled as a fluid. For the elastic case, there remain accuracy limitations for problems involving sloping interfaces. Progress on this problem is achieved by improving and benchmarking the mapping solution. This approach is extended to handle multiple solid layers and propagation between sea and land. It is applied to new types of problems, such as the propagation of a Scholte wave up a sloping ocean bottom and conversion to a Rayleigh wave on land. Although the available benchmark solutions are limited, the results indicate that the mapping solution should be accurate for a large class of problems when slopes are small and that this assumption can be relaxed by applying a simple correction. 相似文献