嵊州水运小地方也有大潜力

<正>据嵊州港航部门最新统计资料显示,到11月底,全市水路运力4603载重吨,货运船舶平均载重吨达到76.7t,比2004年底的43t增长78.4%。其中,100吨级以上船舶的数量由2004年的5艘增加到19艘,吨位占到总运力的     

浅谈黄土地区隧道地质超前预报技术的应用

以静宁隧道为例,来说明TGP206隧道地质超前预报技术在黄土地区的应用.     

用油漆书写军旅人生的车辆装备“美容师”——记73061部队92分队四级军士长李海军

李海军，男，河南省唐河县人，1977年出生，1996年入伍，2000年入党，大专学历，现为南京军区所属73061部队92分队四级军士长。入伍14年来．李海军时刻怀着一种感恩之心，默默地在本职岗位上耕耘，报效党和部队的培养，以饱满的热情扎根军营做奉献．先后荣立三等功1次，     

Application of conservative surrogate to reliability based vehicle design for crashworthiness

Surrogate models are commonly used for approximation of large computationally expensive vehicle crash simulation to facilitate rapid design space exploration and optimization. Unfortunately, the optimum design based on surrogates may turn out to be infeasible after running finite element crash simulation due to the surrogate errors. To meet this challenge, conservative strategy of surrogate modeling through compensating fitting errors was used for reliability based design optimization of vehicle structures for crashworthiness and weight reduction. The critical crash responses were constructed by unbiased kriging models, and conservative surrogates were obtained via adding safety margin to estimate the crash responses conservatively. The benefits of using conservative surrogates for reliability based design optimization were investigated in the context of constraint feasibility of the optimum designs through a mathematical example and a case study on vehicle crashworthiness design. The results demonstrate that optimization based on conservative surrogate helps to achieve the feasible optimum design, showing more attractive for reliability based design optimization in engineering applications.     

疏浚排泥管在不同管道组合下的输送摩阻分析

疏浚排泥管是疏浚工程介质输送的重要组成部分,其输送阻力是吹填排距和性能的决定性因素之一。以细粉砂土质的三夹沙南航道工程为依托,针对疏浚排泥管开展2 m长橡胶管和12 m长钢制管在不同连接组合方式下的输送阻力现场试验与对比分析。结果表明：管道压力损失随着输送流速和浓度的增大而增大;纯钢管组合下的输送摩阻最小,“4钢管+1橡胶管”组合的输送摩阻次之,“1钢管+1橡胶管”组合的输送摩阻最大,其相比于纯钢管组合的输送摩阻增大约6%。研究结果可为工程现场的排泥管布设与施工提供指导。     

秦皇岛港煤五期翻车机房及廊道地连墙侧向变形监测分析

秦皇岛港煤五期翻车机房及廊道工程基础采用地下连续墙形式。由于地下连续墙施工难度大、施工工期要求高,为了保证该工程顺利完成,同时为类似工程积累数据,在施工过程中对工程的变形、应力及压力等方面进行了详实的观测。通过对侧向变形实测结果分析,指导了工程施工。     

The Homomorphic Key Agreement

Introduction As a result of the increased popularity ofgroup-oriented applications and protocols, groupcommunication occurs in many different settings:from network layer to application layer. Regard-less of the underlying environment, it is necessaryto pr…     

基于正面力传递路径的轿车车身结构耐撞性

为了提高整车安全性，研究了某轿车车身结构耐撞性。分析了整车正面碰撞过程中碰撞力传递路径，利用HyperWorks软件，建立整车有限元模型，对车身结构关键零件（前纵梁、保险杠横梁和冲撞盒）进行改进设计。利用LS—DYNA软件，根据中国新车评价规程（CNCAP）碰撞安全法规，进行了100％刚性壁（RGB）正面碰撞和40％偏...