拖拉机悬挂系统研究状况及一种新研究方法初探

综述国内外历年来的拖拉机液压悬挂系统性能研究的方法与成果,提出悬挂系统耕作性能的概念,以及对该性能进行室内仿真试验研究的新方法。     

一种适用于推算气态乙烷系氟里昂粘度的基团贡献法

根据关系式与大量的实验数据分析，提出了一种新的适用于常压下气态乙烷系氟里昂粘度推算的基团贡献法，用有可靠实验数据的７种乙烷系氟里昂对新方法进行检验，优于已有的Ｒｄｃｂｅｎｂｅｒｇ法和法．一般偏差在±５％以内，可以满足ＣＦＣｓ替代物合成和应用研究以及一般工程计算的需要．用新方法对低压下ＨＣＦＣ－１３３ａ气态的粘度进行了计算，所得结果可供ＨＦＣ－１３４ａ合成工艺及装置设计和其它工程计算应用．     

动态输出反馈下广义互联分散控制系统固定模

讨论广义互联系统的动态分散输出反馈控制问题，相应给出判别有穷固定模和脉冲固定模的充要条件，分析了动态分散控制器用于广义系统分散控制的优缺点，并澄清了文献中有关脉冲固定模判别条件的模糊之处．     

线性系统更广的一类控制问题

讨论了有限维线性系统的更为一般的控制问题和能控性问题。得到相应的一些判别法，最后引入刻划系统能控性程度概念－可控度。     

一类可分散镇定的线性大系统

本文研究用局部状态反馈使具有关联耦和的线性定常大系统镇定的问题，给出了一类可分散镇定的线性大系统，并提供了相应的分散镇定算法，文中结论是Ｓｅｚｅｒ和Ｈｕｓｅｙｉｎ在文［１］中所得结果的推广．     

Oxygen consumption and the evolution of order: negentropy criteria applied to the evolution of ants

Optimization of energy use by evolving organisms, predicted by theoretical extensions of the neo-Darwinian theory, i. contrasted with that of irreversible thermodynamics, which predicts an increase in orderliness and thus an increase in energy consumption per unit of biomass. We compared this index with estimates of social complexity among ant genera and species. Our results show that simple optimization models cannot explain experimental data, and that social complexity correlates differently with negentropy at different levels of analysis. Comparing the genera among Formicidae, workers (not colonies) from genera with highly social species are less negentropic than those of socially primitive ones. At the sub-generic level, social complexity correlated positively with negentropy among species, for major workers inAcromyrmex and for minor workers inAtta. The results illustrate the complexity of thermodynamic criteria in the study of evolution but also hint at their usefulness. In this case, they show that two different evolutionary routes to the complex Attini ant societies may exist.     

非标准拓扑动力系统

本文采用非标准分析方法研究拓扑动力系统。应用Nelson的“内涵集合论”概念给出了拓扑动力系统的非标准表达,为进一步解决该领域中一些公开问题打下基础。     

PROBLEM-ORIENTED INFORMATION RETRIEVAL DECISION SUPPORT SYSTEMS

Decision Support Systems(DSS)are man-machine interaction systems,which support the de-cision-makers to solve the unstructured and semi-structured decisions,this paper advances that thefunction of problem-oriented information retrieval DSS can meet the needs of enterprise's topmanagement effectively in comparison with other information retrieval functions,in accordancewith the features of supporting information for decision.An architecture of this system is presented,which dissolves a problem put forward or recognized by the user into the problem recognized by thecomputer,forming retrieval tactics and searching the data the user needs.Designed and developedaccording to the architecture of this system,a prototype system is introduced,which is CF Econom-ic Environment Information Retrieval DSS.     

强耦合抛物组解的整体存在性和不存在性

本文利用半群方法证明了一类强耦合非线抛物型方程组初边值问题的整体解存在性；用特征函数方法，给出了整体解不存在的一个充分条件。