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交通运输与区域发展的耦合关系及特点 总被引:1,自引:0,他引:1
本文通过对交通运输与区域发展的耦合关系进行梳理,得出两者之间耦合作用发展过程中表现出的方向性,阶跃性,时滞性。进而提出在不同的区域发展环境下,交通运输发展可以有两种方式:适度发展和适度超前发展。 相似文献
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浅谈工程造价管理与施工企业管理 总被引:1,自引:0,他引:1
通过论述如何做好工程造价管理来实现增加项目收入和降低项目成本,阐明了工程造价管理在施工企业管理中的重要地位及二者相互依存、相互促进的关系。 相似文献
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实现文化公平,既是构建社会主义和谐社会的重要内容,也是其重要条件.要实现文化公平、构建和谐社会就必须大力发展生产力,重视教育的功能,着力建设公共文化服务体系和文化市场体系,发挥政府以及民间力量等方面的作用. 相似文献
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Small diameter arterial prostheses were required to treat coronary and cerebrovascular arterial diseases. The diameters of the artificial blood vessels should match the diameters of the host arteries. Besides,the mechanical properties of the arterial prostheses should be strong enough to endure the forces in the body after implantation. In this study,silk and polyester were woven into small diameter arterial prostheses and the dimensional and mechanical properties,as well as the water permeability,were investigated. The woven samples had an inner diameter ranging from 3. 65 to 3. 94mm. The wall thickness of the samples ranged from 0. 26 to 0. 28mm. Compared with polytetrafiuoroethylene( ePTFE) commercial devices,whose probe bursting strength was measured to be 15. 64 N /mm2,the woven samples had superior strength values ranging from20. 53 to 28. 97 N /mm2. In addition,the radial compliance of the woven samples was found to lie between the ePTFE sample and the pig’s carotid artery,and the water permeability of all the woven samples was less than 300 mL /( cm2·min) which indicated that these woven samples could be implanted without preclotting. 相似文献
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