“过渡性杂种”：中国乡镇企业的发展及制度转型

中国在经济转型过程中产生了不少会被经济学家认为是“奇怪”的“物种”，比如乡镇企业。本文拟建立一个初步的理论框架来解释这种现象。文章用一条乡镇企业的“（约束下的）最优转型路径”，说明“过渡性杂种”如何在其他（未改革的）制度的约束下产生和发展并到达其目标形式，以及整个政策环境与乡镇企业的发展又是如何相互影响的。文章指出，“第三条道路”。或“过渡性杂种”，可能正是完成转型的最佳道路。     

现代化水利建设迫切需要完善质量监督工作体系

江苏省的市、县级水利工程质量监督体系尚未建立,远未健全。质量监督存在制度不完善、效能不到位等问题。今后一个时期,大规模水利建设和水利现代化建设,需要质量监督作为工程质量重要保障,应通过健全监督体系、完善监督制度、抓住质量监督重心、强化质量检测管理、实现全程监督检查等措施,来确保质量监督工作的成效。     

The optimal retrieval of ocean color constituent concentrations based on the variational method

In this paper, a new approach to the optimal retrieval of the ocean color based on the variational method is developed by setting up a rational target functional combining with the Broydor Fletcher, Goldfarb, Shanno (BFGS) optimal algorithm. The numerical tests and the exemplary retrievals are carried out and compared with the statistical retrievals and the optimal retrievals based on the genetic algorithm. The results show that this approach enjoys a higher accuracy as compared to the statistical method and a higher efficiency as compared to the genetic algorithm. The optimal retrieval method presented in this paper provides a new idea for the ocean color inversion and could also be used as a reference for the direct assimilation of the satellite data into the ecological models.     

公司法人治理结构的缺失与完善

分析了我国目前公司法人治理结构上存在的问题,并对新形势下国有企业如何更好地完善公司法人治理结构提出了改革的思路和建议。     

包神铁路的货运营销策略

本文通过对当前铁路货运工作存在着三个方面问题的分析,提出一系列货运营销工作的新举措,通过采取加大科技投入、加强技术管理、强化制度创新,实现运输企业经济效益和社会效益的最大化.     

管棚与钢支撑在地下厂房开挖中的应用

介绍了管棚和钢支撑用于地下厂房软弱围岩开挖工程支护的结构型式、布置和工艺过程.     

化学灌浆技术在锦屏一级电站工程中的试验研究

介绍了锦屏一级水电站化学灌浆试验研究及施工情况,明确在此类地质条件下采用化学灌浆是完全必要且可行的,整个试验取得了成功,对今后工程的实施及类似工程项目的试验研究具有借鉴意义。     

海上风电大直径单桩基础海缆引入施工技术

以江苏某海上风电工程单桩基础引入海缆施工为对象,基于目前国内外常用的桩身外侧设置电缆管引入和桩身开孔引入两种海缆进风机塔筒内部的技术利弊对比分析,对大直径单桩基础引入海缆施工工艺及关键技术进行了研究;并结合本工程海洋环境、地质条件,推荐采用桩身开孔引入海缆的布置方式,对于深水的机位其优点大于缺点。     

龙滩水电站500 kV GIS设备安装

龙滩水电站500kV GIS安装在时间紧、任务重的不利条件下,经过参建单位精心组织、科学施工、严格控制,仅用5个月时间即提前完成了安装调试工作,确保了龙滩电站1号机组顺利提前投产发电,也为其他巨型电站GIS设备的安装提供了宝贵的经验。     

A TVD SCHEME FOR INCOMPRESSIBLE FLOW COUPLED WITH DIFFERENT TURBULENCE MODLES ON A GROUND- MOUNTED SQUARE-RIB FLOW

A finite-difference Total Variation Diminishing (TVD) numerical simulation model for coupling the Reynolds Averaged Navier-Stokes (RANS) equations, pressure-relative continuity equation and various k-εturbulence models was developed to solve the incompressible flow based on the pseudo-compressibility method. The hyperbolicity of all these equations was studied and the discretization of the fully coupling equations with all the primal variables and source terms were made in this article. Numerical simulation for modeling the flow around a ground-mounted square rib was implemented and validated by comparing with the published wind tunnel experimental data. It is shown that such a numerical simulation method with a proper turbulence model has a very good accuracy to simulate the flow around a surface-mounted rib. It is concluded that the Renormalization Group (RNG) and Chen-Kim k-εturbulence models have much better ability to predict the characteristics of the vortex structure and flow separation than the standard k-εmodel.