百色水利枢纽导流隧洞堵头温控计算分析

介绍了百色水利枢纽导流隧洞堵头施工及运行过程温控计算及仿真分析的计算参数、计算模型、边界条件等,分析了封堵堵头温度场和温度徐变应力场的计算成果,为设计和施工提供理论参考。     

风险分析方法与三峡工程投资风险分析

三峡工程具有巨大综合利用效益。工程建设的特点是投资总量大，建设周期长，工程系统复杂，不确定性因素多，影响大。投资风险成为投资者非常关注的问题。运用图示评审技术与含相关因素处理的蒙特卡洛随机模拟相结合的计算模型，可以对这种风险的大小进行量化分析。ＧＥＲＴ随机网络直接参考施工网络图绘制，使投资分解、风险因素辨识，量化等更具直观性，使分析过程更接近于实际。该投资风险分析模型，对水利水电工程系统具有通用性     

多目标约束环境下的模块化产品族设计方法研究

研究了在多目标约束环境下的产品族设计方法。针对产品族结构和设计特点 ,结合大批量定制设计(DFMC)、产品生命周期管理等思想 ,以功能、装配和成本约束为手段 ,以产品族核心平台 (product platform)的求解为设计目标 ,给出了模块化产品族设计方法。通过对各种约束的量化和定性分析 ,促进了产品族设计的合理性和有效性。该方法对于基于核心平台的模块化产品族设计具有良好的可行性     

A computerized and integrated approach for heat exchanger network design in multipurpose batch plants

Significant savings in the utility cost of batch plants can be obtained by heat integration. In this study, an integrated mathematical programming approach is developed for the determination of the cost optimal heat exchanger network for multipurpose batch chemical plants. A single step, interactive computer program (BatcHEN) which is developed for the determination of the campaigns (i.e. the set of products which can be produced simultaneously), the heat exchange areas of all possible heat exchangers in the campaigns and finally the heat exchanger network are all discussed. A matrix search algorithm is used for the determination of the campaigns. Heat exchange areas for the possible heat exchangers are found by solving a nonlinear optimization model with a grid search algorithm. Finally the heat exchanger network optimization is modeled as a mixed integer linear programming problem and then solved by the modeling and optimization software GAMS/XA.     

百色水利枢纽下游河床防护设计

根据百色水利枢纽坝址下游河床的工程地质情况,论述了下游护坦设计方案及水工模型试验的过程及结果,并简要介绍了护坦的基础处理及细部设计.     

Growth performance, variability in yield traits and oil content of selected accessions of Jatropha curcas L. growing in a large scale plantation site

Jatropha curcas L. (JCL) is gaining global popularity as a potential feed stock of biodiesel and a candidate species for waste land reclamation. Although the oil yield of this species is better than any other non-edible oil yielding plants, the lack of agronomic practices defame this species for further exploitation. Furthermore, there is paucity of data on the growth performances and yield of JCL plantations. In this context, a systematic study on passport data and yield performance of JCL germplasms (including their indigenous collection number (IC No.), morphological characterization of seeds and seed oil content) growing in a large scale plantation site at Solar Energy Center, Gurgaon, India were carried out during 2007–2008. Ten elite accessions of JCL were screened from this site based on their growth performance and biomass characterization and were deposited at National Bureau of Plant Genetic Resources, New Delhi for registration. The oil content of the 10 registered accessions was ranged from 17% to 34%. Cluster analysis was performed to find out promising germplasms. Cluster analysis formed two prominent groups, each one with two sub-clusters. The promising accessions can be further explored for crop improvement programs. Furthermore, multi-locational trials are essential for optimizing the agropractices for maximum yield for a sustainable biodiesel production.     

小浪底水利枢纽的初期运行管理实践

小浪底水利枢纽是一座以防洪、防凌、减淤为主，兼顾供水、灌溉和发电的综合性特大型枢纽控制工程，具有规模宏大、技术结构复杂、泥沙问题突出、社会效益显著的特点。为此对初期运行进行了总结、分析。水库调度、调水调沙、库区异重流方面的实践，对小浪底水利枢纽下阶段的运行管理和类似枢纽的运行管理具有一定参考意义。     

地质雷达在工程地质调查中的初步应用

地质雷达作为一种新技术，在工程地质调查中具有分辩率高，信息量丰富，能直观地反映地下介质的构造特征等优点。文章简述了地质雷达探测的原理和３个应用实例，从初步应用成果可以看出，在南水北调中线工程渠线覆盖层探测中，地质雷达可有效分辨粘土与砂层以及这些层中的薄层与透镜体分布，对地下水位也有明显反映。在三峡工程花岗岩风化分带探测和建基面风化槽探测中，地质雷达剖面清晰地反映地基岩内部的不均匀风化特征。     

三峡电站下游坝面钢衬钢筋混凝土管道结构设计

三峡电站压力管道设计采取下游坝面布置的钢衬钢筋混凝土地联合受力结构，大量的计算分析和仿真模型试验成果表明，这种结构具有较好的工作状态和较高的安全度。招标设计成果表明，在现有材料供应条件下，钢衬采用１６ＭｎＲ厚度２８～３６ｍｍ；钢筋选用Ⅱ级钢筋，分４～５层布置，这一方案是完全可行的，但为了减小施工难度，设计上将进一步研究采用提高钢筋材质及钢衬承载比例等措施，减少外包钢筋混凝土钢层数，提高结构的潜在安     

黄河小浪底水库下游河床冲淤发展趋势

根据黄河水沙特性，运用适合于多沙河流的挟沙力公式，研制出应用于黄河下游河道变形数模程序。通过对黄河铁谢至利津河段长系列演算与分析，预估小浪底水库运用后，坝下游河道将发生不同程度的冲淤变化，以铁谢至高村段河床冲淤变化较大，高村以下河段冲淤变化较小。