拱坝多目标优化设计

本文解决了在优化中考虑稳定约束、开挖量、开挖深度、拉应力区等问题,并根据本文的数学模型编制了FORTRAN77程序在长城0520A型微机(与IBM—PC兼容)上实现,经过实际工程优化设计的考验,证明了本文程序的实用价值,为拱坝优化设计的全面推广创造了条件。     

聚酯型脂肪族聚氨酯的合成及其表征

本工作分别利用本体一步和本体预聚法探索合成出一种新的组成变化范围较大的聚酯型脂肪族多嵌段聚氨酯(Aliphatic Segmented Polyurethane,简称ASPU)。利用元素分析、IR、~1HNMR,WAXD、DMA、SEM等对样品进行了较为全面的表征,发现ASPU与芳香族聚氨酯最大的不同是其抗溶剂性强,硬段结晶度高,并且硬段的晶胞参数与纯硬段相同。也不随硬段含量而变化。     

The Knowledge Age or the Age of Ignorance and the Decline of Freedom?

Increasingly knowledge has become a determining factor in achieving life’s potential and is the currency of the age. Without access to Information an individuals’ knowledge base cannot be enriched and without knowledge the individual becomes increasingly powerless. Advances in technology have provided opportunities for some to add to their stock of knowledge but access to sources of information is uneven and can lead to social unrest. The availability of information is an important factor in managing change and empowering citizens. The question about information and power then becomes one of ownership or sovereignty of the information. If we are to create an open society then we need to ensure that there is open access to knowledge through flexible and intelligent information systems that are available for all. In this paper we consider if we are truly entering the knowledge age or the age of ignorance.     

浅析投标工作与项目施工的衔接

对投标工作与项目施工脱节的问题及造成的严重后果进行了阐述，并对造成这些情况的原因进行了分析，提出了几点解决意见。     

浅谈企业民主管理

文章通过论述民主管理的意义,提出了加强企业民主管理的认识。     

Advances in Arabidopsis research in China from 2006 to 2007

Arabidopsis thaliana, a model plant species, has a number of advantages over other plant species as an experimental organism due to many of its genetic and genomic features. The Chinese Arabidopsis community has made significant contributions to plant biology research in recent years[1,2]. In 2006, studies of plant biology in China received more attention than ever before, especially those pertaining to Arabidopsis research. Here we briefly summarize recent advances in Arabidopsis re-search in China.     

Resolution for Conflicts of Inter-Operation in Multi-Domain Environment

This paper proposes a method to formalize the interoperation in multi-domain environment. Through employing the algebra method, we conclude four types of the conflicts for the interoperation, and analyzes the cause of the policy conflicts. For each type of conflicts, we formalize it and proposes the method of detection and resolution. Finally, the method is illuminated be effective through comparing our work with others.     

通过卡车调度实现露天矿矿石质量控制

矿石质量控制是露天矿生产的一个重要方面,是露天矿提高经济效益的有效途径.本文讨论了通过计算机控制卡车调度来实现露天矿矿石质量控制的方法,建立了实现矿石质量控制的调度模型,包括剥采计划的质量控制模型,多目标综合优化的车流规划模型,实时调度控制模型等,并以实际矿山为例,进行了应用研究分析.     

Swelling behaviors and pervaporation properties of CA/PAN composite membranes for separation of caprolactam/water mixtures

The composite membranes with cellulose acetate (CA) as the separating layer material and polyacrylonitrile (PAN) as the supporting layer material were prepared for separating caprolactam (CPL) from CPL/water mixtures by pervaporation technique. The swelling experiments were carried out to investigate the effects of swelling time and CPL concentration on the degree of swelling. The results showed that the CA membrane reached swelling equilibrium within 24 h, and the degree of swelling first slightly decreased then increased with the increase of CPL concentration in the feed under the experimental conditions. Respectively comparing flux with permeance, and separation factor with selectivity, we found out that the separation performance of the CA/PAN composite membrane is more strongly dependent on its hydrophilic/hydrophobic nature as well as on the effects of operating parameters, such as feed composition concentration and feed temperature.     

Adaptive tracking control for actuator failure compensation based on MT-filters

<正> This paper considers the problem of actuator failure compensation for a class of nonlinearsystems in the form of output-feedback.MT-filters are exploited to estimate the unmeasured states.The backsteppping technique is used to construct the controller recursively.The proposed compensationscheme can grantee the boundedness of all the closed-loop signals and asymptotic output tracking.Thetheoretical results are illustrated by a simulation example.