公路建设项目中隧道洞渣的利用及预算编制时需注意的问题

为贯彻“绿色公路”的发展理念,遵循“节约资源、循环利用”原则,减少用地,节约投资,项目建设中充分考虑隧道洞渣的综合利用已经成为一种必然趋势。文章以浙江省建德至金华公路为例,对隧道洞渣的综合利用情况进行分析,并对预算编制中需注意的问题和节约造价进行阐述,供相似工程参考。     

脉压对冠状动脉病变的影响

目的探讨脉压[PP=收缩压(SBP)-舒张压(DBP)]对冠状动脉病变的影响。方法对221例经冠状动脉造影确诊的冠心病患者,分析其SBP、DBP和PP高低与冠脉病变支数、记分及临床表现的差别。结果①高SBP组[≥140mmHg(1mmHg=0.133kPa)]和高DBP组(>81mmHg)较低SBP组(<140mmHg)和低DBP组(≤80mmHg)年龄大,女性比例高,不稳定心绞痛(UA)和急性心肌梗死(AMI)比例低。②高PP组(≥50mmHg)较低PP组(<50mmHg)年龄大,女性比例高,UA和AMI比例差别消失,多支血管病变多。结论与高SBP组和高DBP组的临床表现不同,高PP组多支血管病变多,而患UA和AMI的比例与低PP组比无明显差异。     

地铁主控系统与机电设备监控系统接口分析

介绍了目前地铁主控系统的特点及其主要结构、地铁机电设备监控系统的特点和结构,及其接口互联技术的功能分类和特点.并对地铁主控系统与机电设备监控系统接口问题进行了分析,归纳了两种接口方式:一种是通过地铁主控系统的主干网与机电设备监控进行数据交换和互联,其通信介质为以太网方式;另一种是机电设备监控系统作为主控系统的一个被控端,不采用以太网方式.     

混合动力汽车镍氢电池组通风结构优化分析

对混合动力汽车现有的镍氢电池组的通风结构进行了研究,分析了不同电池模块配置方式对电池组冷却空气流场和温度场分布的影响.在现有的顺排和叉排的基础上提出了梯形排列,采用ANSYS CFX软件对不同排列进行了数值模拟,结果表明,梯形排列方式可以较好地改善电池组温度分布的均匀性.最后,设计了梯形排列电池组样机,并进行了充放电和温度测量试验,验证了数值仿真的结果.     

膜片弹簧的加工成本模型和概率优化的研究

以离合器膜片弹簧为例,对膜片弹簧加工成本模型进行了研究,对不同部位的加工,采用不同的加工成本与公差之间关系的模型;进而基于这些模型,结合零件的尺寸段及其加工精度,建立了膜片弹簧尺寸离散范围的概率优化模型,以膜片弹簧预期的合格率为约束,制造成本最低为目标,进行概率优化,最终得到在一个满足约束条件的合格率下,使相对加工成本最低的尺寸公差.     

现代小型客货船研究

小型客货船的主要尺度，空船重量，功率和航速发展趋势，小型客货船的船型，完整稳性和破舱稳性，客船防振降噪及减摇设计及安全性和新材料应用。     

组态王软件小点数加密锁的运用技巧

以机车微机试验台测试项目为例，介绍了利用纽态王软件小点数加密锁运行大工程，从而降低项目成本的方法。     

Calculation on the solid solution forming enthalpies of Re-Mo-Ti gradient alloy in thermodynamics

The idea about preparation of Re-Mo-Ti alloy is put forward because of applications of Re and Mo-Re alloys in aerospace. Basing on the thermodynamics theory, the feasibility of developing a new high temperature alloy Re-Mo-Ti is investigated. The solid solution forming enthalpies of binary alloys Re-Ti, Mo-Ti and Mo-Re are calculated with the Miedema thermodynamics theory. The Miedema theory of binary alloy can be used in ternary alloy through Kohler model or Toop model. The calculated results show that the forming enthalpies of binary alloys Re-Ti, Ti-Mo and Re-Mo are negative, which indicates that binary alloys Re-Ti, Ti-Mo and Re-Mo can form solid solution in wider component area. The forming enthalpies of Re-Mo-Ti ternary alloy are still negative and smaller than those of binary alloys Re-Ti, Ti-Mo or Re-Mo, which indicates it is possible to form large solid solution graph area among ternary alloys of Ti, Mo, Re elements. It is feasible to develop a new high temperature material in thermodynamics, in this material Re-Mo-Ti solid solution as base phase, and the Ti₅Re₂₄ intermetallic compounds or interphase ω (Ti₄Mo₃) as strengthening phase.     

Application of particle swarm algorithm in the optimal allocation of regional water resources based on immune evolutionary algorithm

The optimal allocation model of regional water resources is built with the purpose of maximizing the comprehensive economic,social and environmental benefits of regional water consumption.In order to solve the problems that easily appear during the model solution of regional water resource optimal allocation with multiple water sources,multiple users and multiple objectives like＂curse of dimensionality＂or sinking into local optimum,this paper proposes a particle swarm optimization（PSO）algorithm based on immune evolutionary algorithm（IEA）.This algorithm introduces immunology principle into particle swarm algorithm.Its immune memorizing and self-adjusting mechanism is utilized to keep the particles in the fitness level at a certain concentration and guarantee the diversity of population.Also,the global search characteristics of IEA and the local search capacity of particle swarm algorithm have been fully utilized to overcome the dependence of PSO on initial swarm and the deficiency of vulnerability to local optimum.After applying this model to the allocation of water resources in Zhoukou,we obtain the scheme for optimization allocation of water resources in the planning level years,i.e.2015and 2025 under the guarantee rate of 50%.The calculation results indicate that the application of this algorithm to solve the issue of optimal allocation of regional water resources is reliable and reasonable.Thus it ofers a new idea for solving the issue of optimal allocation of water resources.     

橡胶金属装配一体式隔振器静态特性的有限元分析

以某型橡胶金属装配一体式隔振器为原型,结合有限元分析软件ANSYS,提出了该类型隔振器的静态特性有限元分析通用方法.文中对该型隔振器的一体式橡胶金属弹性元件的轴向、径向静态特性进行研究;利用ANSYS的单元生死和绑定接触功能来实现弹性元件与金属骨架的装配,建立该型隔振器总成的有限元模型;计算出其3个方向的静刚度,并对有限元计算结果与试验结果进行比较.结果表明:提出的方法是可行的,可推广应用于同类型的隔振器.