通过风险管理、计和加固来减少公路桥梁的地震易损性

过去几十年间历次大地震造成的人员和巨大财产损失凸现出减少公路系统地震灾害风险的必要性。结合历次震害经验教训,基于联邦公路署多个地震研究项目的最新成果,表明通过一个整合的风险评估和设计／加固过程,可以更好的达到减少地震灾害的目的。     

The motion analysis of fire video images based on moment features and flicker frequency

In this paper, motion analysis methods based on the moment features and flicker frequency features for early fire flame from ordinary CCD video camera were proposed, and in order to describe the changing of flame and disturbance of non-flame phenomena further more, the average changing pixel number of the first-order moments of consecutive flames has been defined in the moment analysis as well. The first-order moments of all kinds of flames used in our experiments present irregularly flickering, and their average changing pixel numbers of first-order moments are greater than fire-like disturbances. For the analysis of flicker frequency of flame, which is extracted and calculated in spatial domain, and therefore it is computational simple and fast. The method of extracting flicker frequency from video images is not affected by the catalogues of combustion material and distance. In experiments, we adopted two kinds of flames, i.e. , fixed flame and movable flame. Many comparing and disturbing experiments were done and verified that the methods can be used as criteria for early fire detection.     

荷兰铁路DM90型内燃动车组

介绍荷兰铁路ＤＭ９０型内燃动车组的设计方案、内部布置及列车控制系统。     

双方合作消除镉镀层——第二部分

前言：本文的第１部分刊登在上一期，我们看见了克莱斯公司为了评定紧固件镉镀层的替代镀层是如何进行开发试验的，本文的第２部分考查了结果和结论。     

一种海上防油污用浮油回收装置原型的设计

本文介绍西德克虏伯·鲁罗尔特船厂与克虏伯研究所共同研究制造的一种新型浮油回收装置。试验证明,该产品可在近海区作业,符合西德联邦科技部(BMFT)对浮油回收装置提出的要求。