中心管爆炸开舱战斗部破片抛撒速度计算方法研究

推导了圆柱状密实接触中心管爆炸开舱战斗部破片抛撒速度估算Gurney算式。对在中心管破裂后爆炸产物继续膨胀给设置在靠近蒙皮内表面处破片产生运动速度的作用，提出了作分步处理的设计计算方法。     

Geomorphic effects of large wood jams on a sub‐antarctic mountain stream

Dead wood pieces, especially when organized in jams, play an important geomorphic role in streams because of the effects on flow hydraulics, pool formation and sediments storage. The increase in stream morphological diversity and complexity also exerts an important ecological role. This work reports on geomorphic role of large wood (LW) pieces and jams in a third‐order mountain stream located in the Southern Tierra del Fuego (Argentina), and draining an old‐growth Nothofagus‐forested basin not influenced by the beavers damming activity. Even if the in‐stream number of wood pieces (length >1 m; diameter >0.1 m) is comparable to that observed in other climatic areas, the slow growth of the Nothofagus forest causes a lower wood abundance in terms of volumetric load. Because of the relatively small dimensions of the surveyed LW pieces, almost 70% of them demonstrated to have been fluvial transported and also the wood jams reflect the apparent dynamic nature of wood in the channel. Wood jams exert a significant influence on the channel morphology, representing almost half of the drop caused by steps and being responsible for the creation of 30% of the pools. LW‐forced pool volume is strongly and positively correlated to the height of the LW jam. The geomorphic influence of LW jams is also exerted by a considerable sediment storing capacity. Copyright © 2008 John Wiley & Sons, Ltd.     

用粘接技术修复唐钢煤气余压发电机

唐钢3^#TRT煤气余压发电机2000年投产。由于制造缺陷，在设备运行中中间轴跳动值超标，从而引起设备振动大而停机。采用胶粘剂，彻底解决了中间轴跳动值大的问题，运行近1年，效果良好。     

桥梁伸缩缝处跳车的原因分析及防治措施

介绍了桥梁伸缩缝处跳车的危害性及防治必要性,从设计、施工、养护、交通流量四方面分析了造成桥梁伸缩缝处跳车的原因,并提出防治措施,以消除桥头跳车现象的发生,从而保证行车的安全性及舒适性。     

Parallel asynchronous variational integrators

This paper presents a scalable parallel variational time integration algorithm for nonlinear elastodynamics with the distinguishing feature of allowing each element in the mesh to have a possibly different time step. Furthermore, the algorithm is obtained from a discrete variational principle, and hence it is termed parallel asynchronous variational integrator (PAVI). The underlying variational structure grants it outstanding conservation properties. Based on a domain decomposition strategy, PAVI combines a careful scheduling of computations with fully asynchronous communications to provide a very efficient methodology for finite element models with even mild distributions of time step sizes. Numerical tests are shown to illustrate PAVI's performance on both slow and fast networks, showing scalability properties similar to the best parallel explicit synchronous algorithms, with lower execution time. Finally, a numerical example in which PAVI needs ≈100 times less computing than an explicit synchronous algorithm is shown. Copyright © 2006 John Wiley & Sons, Ltd.     

浅谈藻类物质对制水的影响及防治措施

介绍了藻类物质产生的原因和危害以及对制水过程的影响， 着重从水厂现行状况出发，提出了几种简单易行的优化及强化常规工艺的化学方法和措施。     

Hopping height control for hopping robots

In recent years, legged robots have progressed and are able to walk just like human beings. Hopping offers a possibility of moving faster and avoiding larger obstacles than walking. Thus, hopping becomes more significant. Copyright © 2004 Wiley Periodicals, Inc. In this paper, to take account of torque limits of motors, we propose the method of controlling the hopping height by changing the leg length at bottom. Considering an actual environment, the environment will change as the robot moves around. Therefore, we describe a way to estimate the actual thrust force. Using the estimated thrust force, command value of leg length in the landing phase is determined. The effectiveness of the proposed method is confirmed by simulation and experimental results. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 155(1): 64–71, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20172     

浅谈压力管道的检验

针对压力管道检验环节薄弱的现状,分析了各种检验手段,介绍了压力管道检验要点     

三阶孤子传输和相互作用的数值研究

用分步富里叶变换法求解三阶孤子传输的NLS方程，得到了在此条件下孤子传输的数值图形，发现三阶孤子在传输中被压缩和裂变，三阶孤子的相互作用加速了孤子的裂变。通过增加二阶色散系数可抑制孤子的裂变和孤子在传输中的相互作用。     

神经网络自动增益调节伺服电机控制系统

本文提出一种新方法,该方法采用神经网络的方法对伺服控制系统进行自动增益调节,且具有自学习自适应功能.该系统在环境参数发生变化时仍然能适应新的环境条件.该方法的正确性已在称之为“柔性伺服控制器”的控制系统中通过对直流、交流、无刷直流三种伺服电机的速度响应的控制实验中得到验证.