基于改进量子粒子群算法的无分流换热网络综合

用数学规划法求解换热网络优化问题,当换热网络模型考虑所有分流情况时,会包含大量的连续和离散优化变量,因此对大规模换热网络的优化求解非常困难。相比有分流模型,无分流的网络模型结构简单,变量少,求解难度低。本文以分级超结构模型为基础,建立了无分流换热网络模型,以年综合费用为优化目标,提出用单层改进量子粒子群算法综合无分流换热网络,即在生成无分流换热网络结构变量的同时,生成换热负荷变量。相比有分流同步综合模型,不考虑分流的同步综合模型的复杂度和求解时间显著降低。采用两个典型算例对该方法的有效性进行了验证。     

Large-Scale Streamwise Vortices in the Supersonic Part of a Permeable Nozzle

Large-scale streamwise vortices in the vicinity of a perforated wall in the supersonic part of the nozzle are studied. The governing effect of gas inflow through a perforated wall on origination and parameters of streamwise vortices is experimentally established.__________Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 46, No. 5, pp. 68–75, September–October, 2005.     

大型细长钢筋混凝土柱整体吊装“双机五点吊”绳系方案研究

研究大型细长钢筋混凝土（R．C．）柱整体吊装“双机五点吊”绳系方案的最优绳系型式、最优吊点位置、最优绳元高度（对应最优绳长），以解决大中型火电厂的大型细长钢筋混凝土柱整体吊装问题。基于“吊装弯曲应变能力最小”准则确定了吊件最优吊点，进而获得最优绳系型式和最优绳元高度。研究结果可供大型细长钢筋混凝土柱整体吊装施工参考。     

高校大型仪器共享平台的设计与实现

高校大型仪器共享平台是推动高校教学资源社会化管理、提升使用效益和社会价值的重要途径之一。文中分析了当前高校大型仪器使用中存在的主要问题,结合大型仪器共享平台设计的总体目标,运用数据库、ASP.NET等技术设计平台的总体框架、预约实验和检测、分析统计等模块。     

规模化养殖场污染治理措施的效果分析

分别采样监测了存栏量1600头的生猪养殖场在污染治理措施处理前后排放的废气、废水和固体废物等污染物。结果显示在治理措施处理前,锅炉废气中的烟尘、二氧化硫和二氧化氮等浓度分别为1217.94 mg/m3、76.28 mg/m3和163.46 mg/m3。处理后,分别为131.64 mg/m3、35.16 mg/m3和163.46 mg/m3。恶臭气体在处理前,NH3和H2S强度分别为8.3 kg/h和1.28 kg/h,处理后,分别为1.1 kg/h和0.17 kg/h,强度均显著降低。废水在处理前,CODcr、BOD5、SS、NH3-N、TP以及粪大肠菌群数分别为4202 mg/L、1681 mg/L、1261 mg/L、462 mg/L、33 mg/L、256 21个/mL。处理后,分别为320mg/L、130 mg/L、126 mg/L、64 mg/L、3 mg/L、943个/mL,浓度均显著降低。固体废物方面,通过堆肥工艺处理猪粪、采取安全井填埋措施处理病死猪只、利用林地施肥处理沼渣,实现了固体废物的减量化和无害化。在采取污染治理措施后,污染治理效果明显,对今后同类型养殖场具有参考价值。     

Pre-assessment on the loss and impact caused by large-scale flood disasters

Through intensive studies, we have established an index system for evaluating the loss and impact caused by large-scale flood disasters, and constructed a methodological system for pre-assessing the loss and impact caused by large-scale flood disasters. Through numerical simulation, submerged characteristics of large-scale flood can be determined. According to the characteristics of spatial corresponding distribution between land-use types and types of disaster-affecting subjects, we have realized spatialization for social and economic statistic data, and have completed spatialization evaluation on the loss and social impact caused by large-scale flood disasters using the spatial analytical function of GIS software. It is possible that large-scale flood can occur in the lower Yellow River. Flood management requires pre-assessment on the loss and impact caused by flood disasters. Nevertheless, there is no appropriate pre-assessment method for the lower Yellow River at present. By imitating the flood happened in Yuanyang, the north bank of the lower reach of Yellow River in 1958, we did pre-assessment on the loss and social impact caused by the overflow flood. We found that this method can be used to predict the types, quantity and spatial distribution of economic loss caused by large-scale flood disasters. This method can determine population affected by disasters and degree and spatial distribution of disasters. Indirect loss can be predicted as well using this method.In general this method can meet theneeds of regions affected by flood for planning and making decisions in fighting floods and reducing loss.     

太钢2号连铸机大型预埋件安装施工技术

重点介绍了太钢2号连铸机工程大型预埋铁件的施工，通过采用防变形钢固定架，螺旋千斤顶精调整等一系列技术措施，确保了施工精度与质量要求，此施工方法可在大型铁件施工中推广。     

A Scalable Process for Production of Single-walled Carbon Nanotubes (SWNTs) by Catalytic Disproportionation of CO on a Solid Catalyst

Existing single-walled carbon nanotube synthesis methods are not easily scalable, operate under severe conditions, and involve high capital and operating costs. The current cost of SWNT is exceedingly high. A catalytic method of synthesis has been developed that has shown potential advantages over the existing methods. This method is based on a catalyst formulation that inhibits the formation of undesired forms of carbon; it can be scaled-up and may result in lower production costs.     

不确定关联时滞大系统的自适应分散镇定控制

针对时变的满足一定匹配条件的不确定关联时滞大系统,利用自适应界化技术,给出了设计分散镇定控制器的自适应的方法.其特点是在假设中系统不确定项是有界的,但界是未知的,且在关联项存在时变时滞的情况下证明了闭环自适应系统的渐近稳定性.最后举例说明了该方法的有效性.     

Computational schemes for large-scale problems in extended linear-quadratic programming

Numerical approaches are developed for solving large-scale problems of extended linear-quadratic programming that exhibit Lagrangian separability in both primal and dual variables simultaneously. Such problems are kin to large-scale linear complementarity models as derived from applications of variational inequalities, and they arise from general models in multistage stochastic programming and discrete-time optimal control. Because their objective functions are merely piecewise linear-quadratic, due to the presence of penalty terms, they do not fit a conventional quadratic programming framework. They have potentially advantageous features, however, which so far have not been exploited in solution procedures. These features are laid out and analyzed for their computational potential. In particular, a new class of algorithms, called finite-envelope methods, is described that does take advantage of the structure. Such methods reduce the solution of a high-dimensional extended linear-quadratic program to that of a sequence of low-dimensional ordinary quadratic programs.This work was supported in part by grants AFOSR 87-0821 and AFOSR 89-0081 from the Air Force Office of Scientific Research.