变压器油箱渗漏问题的探讨

针对变压器油箱渗漏问题进行了试验研究，分析了引起渗漏的主要原因和防止措施；阐述了焊后进行振动时效处理的工艺措施及试验结果。     

A Probabilistic Approach to Concurrent Mapping and Localization for Mobile Robots

This paper addresses the problem of building large-scale geometric maps of indoor environments with mobile robots. It poses the map building problem as a constrained, probabilistic maximum-likelihood estimation problem. It then devises a practical algorithm for generating the most likely map from data, along with the most likely path taken by the robot. Experimental results in cyclic environments of size up to 80 by 25 meter illustrate the appropriateness of the approach.     

第k条最大可用带宽路径算法

该文提出了无环路的第k条最大可用带宽路径算法．由于具有凹性的带宽和具有加性的代价存在本质区别，第k条最大可用带宽路径算法不能通过简单修改第k条最短路径算法得到．该文结合两个新定义的路径操作和修改的二重扫除算法完成第k条最大可用带宽路径算法，并证明其正确性、无环性和具有多项式复杂性，最后给出实例并讨论算法实际应用．该文解决了基于带宽度量的路由算法中一类很基本的问题；因算法采用能反映网络实时特性的可用带宽作为路由度量，能直接保证网络带宽资源的最优利用．     

蒸发器母液循环泵、过料泵泵壳泄漏分析及对策

介绍我公司氧化铝厂KESTNER蒸发器母液循环泵、过料泵泵壳的泄漏情况 ,分析泄漏原因 ,提出相应的改进措施     

In Vitro hydrodynamic evaluation of prosthetic polymer heart valves in steady flow

Hydrodynamic comparison of two polymer valves with two mechanical valves is presented. The valves were perfused in a steady flow system, and comparisons between the valves were made on the transvalvular pressure distribution and drop, opening area, and leakage volume. Particular emphasis was placed on a slit-type bileaflet polymer valve which was newly designed and fabricated in our research group. The results showed that the functional characteristics of a slit-type bileaflet polymer valve compared favorably with that of mechanical valves. This valve may be a viable and inexpensive alternative, especially for short-term use in TAH or VAD systems.     

SHAPE OPTIMIZATION FOR FATIGUE PROBLEMS IN MECHANICAL ENGINEERING

High Cycle Fatigue (HCF) is a very important topic in mechanical engineering problems. Almost any machine part contains some changes in cross section or boreholes connected with stress concentration. It is the task of shape optimization to improve the strength of machine parts by changing the design at free boundaries. In the past, some work was done with the so-called classical stress concentration factors just to minimize the mentioned stress concentration, also for fatigue. This paper represents a more sophisticated view by including modern Continuum Damage Mechanics (CDM) to model material behavior in HCF. The central question is to design machinery parts so that maximum lifetime is obtained. The whole context for this is developed in this paper, including non-linear finite element algorithms. The paper concludes with numerical and experimental tests for the shape optimization of a notched tension bar in HCF.     

泰州大桥主缆干燥空气除湿法泄漏率的测试实验研究

通过对泰州长江公路大桥主缆送气量和送气压力的数据分析,给出了维护阶段悬索桥主缆漏气量和送气压力之间的半经验公式,对于后期悬索桥在设计使用过程中选择正确的送气压力和送气量有一定的借鉴意义。     

A GENERAL APPROACH TO THE STUDY OF SPATIAL SYSTEMS II. Two Examples of Application

The emphasis in this work is on the practical application of ideas set forth in Part I. Two studies involving spatial distribution are discussed: the distribution of human population in the Indianapolis, Indiana Region, and the world distribution of mammals. In the first, populations over the period 1890–1980 of Ihe 393 townships making up the study area are used to produce classifications involving various numbers of classes of township types. A test of the theoretical structure posed in Part I is then detailed. On the theory that the underlying relations involved cannot sustain a real world structure involving more than five functional classes, it is hypothesized that classifications involving more than five classes will be associated with township distribution patterns that conflict with Central Place Theory. This is shown to be clearly so. In the second study, the derivation of a five region partitioning of world mammalian distribution patterns is described. Discussion includes the introduction of a wholly new rationale for taxonomic revision based on biogeographic criteria (and ultimately the principles described in Part I). The study closes with a short argument regarding why the model described in Part I should not be labelled as either social physics or anti-humanistic.     

Passivity analysis of neural networks with two different Markovian jumping parameters and mixed time delays

This paper studies the problem of passivity analysis for neural networks with two different Markovian jumping parameters and mixed time delays utilizing some integral inequalities. The integral inequalities produce sharper bounds than what the Jensen's inequality produces, consequently, better results are obtained. The Markovian jumping parameters in connection weight matrices and discrete delay are assumed to be different in the system model. By constructing a new appropriate Lyapunov-Krasovskii functional (LKF), some sufficient conditions are established which guarantee the passivity of the proposed model. Numerical examples are given to show the less conservatism and effectiveness of the proposed method.