川江斗笠子滩整治方案与治理效果

川江斗笠子滩为枯水急流滩险.在分析斗笠子滩历史整治得失、碍航特性与演变规律基础上,结合河工模型试 验研究,提出上扩下抬的治理思路,采取疏炸与筑坝的工程措施进行整治.工程实施后,碍航险情消失,整治效果良好.     

舰船电磁兼容设计与仿真发展对策研究

21世纪，随着信息技术的发展，未来的战争是以联合作战和网络中心战为主的信息化战争。介绍舰船电磁兼容技术及相关领域发展趋势，提出舰船电磁兼容设计与仿真研究领域的发展重点、关键技术及发展目标体现的形式。     

捷联惯性导航系统传递对准的杆臂效应分析

在传递对准过程中,需将载体上的主惯性导航系统(简称:主INS)高精度的导航信息传递给武器惯性导航系统(简称:从INS).由于主、从INS在载体上的安装位置不同,而用杆臂矢量描述两套系统的相对位置;当两套系统在空间上分隔较远也就是杆臂矢量幅值较大、且载体有较大幅度的运动时,在传递对准过程中,需要对杆臂效应造成的误差进行补偿.对传递对准过程中,不同形式的杆臂效应引起的各种误差进行了讨论.     

Characteristics of a bubble jet near a vertical wall

A numerical model of a coupled bubble jet and wall was built on the assumption of potential flow and calculated by the boundary integral method. A three-dimensional computing program was then developed. Starting with the basic phenomenon of the interaction between a bubble and a wall, the dynamics of bubbles near rigid walls were studied systematically with the program. Calculated results agreed well with experimental results. The relationship between the Bjerknes effect of a wall and characteristic parameters was then studied and the calculated results of various cases were compared and discussed with the Blake criterion based on the Kelvin-impulse theory. Our analyses show that the angle of the jet＇s direction and the pressure on the rigid wall have a close relationship with collapse force and the bubble＇s characteristic parameters. From this, the application range of Blake criterion can be determined. This paper aims to provide a basis for future research on the dynamics of bubbles near a wall.     

高摩闸瓦和高磷闸瓦制动效果的比较

列车制动摩擦材料的制动效果不能光看摩擦系数的大小,制动效果的最终表现是制动距离的长短。高摩闸瓦（片）和高磷闸瓦的摩擦系数差别较大,而在速度90 km/h以下时,其制动距离却相差甚微。两者制动距离的差别主要表现在更高的速度段。     

潜艇空气污染与污染检测技术

根据国内外潜艇舱室大气污染的状况,论述了舱室主要污染物的来源、对人体的危害和污染物检测技术及发展趋势,为我国开展潜艇大气控制技术研究提供依据。     

Stern waves consisting of forward-oriented breaking waves and the remaining following waves

When a ship with a wide, immersed transom stern runs on a deep draft, forward-oriented wave breaking often occurs just behind the transom stern. In such conditions, stern waves can be considered to consist of two main components: the forward-oriented breaking wave and the remaining following waves. In our previous study, which was the first part of the present study, we developed a method to treat the forward-oriented breaking wave, and have clarified that it has a scale effect and its resistance coefficient decreases with an increase in the size of the model ship. On the other hand, the study also indicated that the height of the remaining following waves increases with an increase in the model ship size. The purpose of this paper is a more complete understanding of the two different component characteristics of the stern waves. We have developed a method to estimate the resistance due to the remaining following waves. Using this method, we have reached three main conclusions. The resistance increases considerably if the remaining following waves change to forward-oriented breaking waves. The resistance coefficient of the remaining following waves increases only slightly with an increase in model ship size. This stern wave resistance coefficient is strongly affected by the forward-oriented breaking waves, and therefore decreases with an increase in model ship size. Received: January 5, 2001 / Accepted: May 28, 2001     

潜艇的实效周向伴流

单轴潜艇的实效周向伴流应被考虑。本文提出了潜艇实效周向伴流的确定和功率的算法。     

浅埋矩形顶管整体背土效应的原因分析与处理措施

为避免浅埋矩形顶管工程中的整体背土破坏现象，在现有研究成果的基础上，结合整体背土理论，依托某地下停车场项目，从实际整体背土现象出发进行原因分析。首先，结合工程现场整体背土破坏现象的特征，得出相邻隧道施工、姿态调整、顶管机停机、减摩泥浆失效等为主要原因。然后，分别阐述本项目采用的注浆管路排查、刀盘前方背土位置堆载、背土位置钻孔注水、施作隔断墙等整体背土处理措施。最终，得出在无法改变管节四周土体抗力的前提下，通过减小管土摩擦因数可有效避免整体背土现象发生的结论。     

谈整车网络架构设计对整车电气系统的影响

本文从整车网络架构设计入手,结合开发过程中的案例,提出网络架构设计对整车电气系统的影响。