丹巴水电站覆盖层处理对闸底板沉降的影响

在覆盖层上建坝,覆盖层材料性质对坝体沉降变形影响较大.为减小坝体沉降,需要对覆盖层进行开挖回填.本文以丹巴水电站为例,拟定覆盖层处理时回填级配料、、回填级配料并固结灌浆等4种方案,根据室内试验参数,分别进行三维有限元计算分析,并对比分析计算结果,为开挖回填方案选择提供参考性意见.     

Impact of an organizational control policy on absenteeism, performance, and satisfaction.

Examined the impact of an organizational control policy based on the concept of "legal compliance" with established organizational norms on 2 behavioral measures--absenteeism and performance--and 2 attitudinal measures of satisfaction. The control policy was experimentally manipulated in each of 2 experimental groups totaling 297 undergraduates. In one group, a compulsory attendance policy followed by a noncompulsory policy was employed, while in the other the sequence of administering the policies was reversed. Attendance, performance, and satisfaction measures were used as criteria in analyses of variance. Results indicate that a control policy based on legal compliance significantly improved attendance and performance and did not alter satisfaction levels. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

弹性地基上矩形贮液结构的液-固耦合振动特性

针对无旋、无粘和不可压缩的理想液体,根据Winkler弹性地基上矩形贮液结构的液-固耦合振动分析模型,通过引入无量纲参数建立了矩形贮液结构的液-固耦合系统的振动方程。为简化计算,根据梁的振型函数和频率方程,将三维问题转化为一维问题来处理,利用振型函数的正交性求解了Winkler弹性地基上矩形贮液结构的液-固耦合振动频率。最后,为便于工程应用,结合工程实际讨论了无量纲参数对矩形贮液结构液-固耦合振动频率的影响,从而为以后工程结构中矩形贮液结构的设计计算提供了理论依据。     

Vibration Control of High-speed Cannonball Transport Mechanism Driven by Impact

A method is presented to control the vibration of high-speed cannonball transport mechanism due to the reduction of its weight, which adhere a nonlinear Zn-27Al-1Cu damping alloy layer and a constraint layer partly to the part of mechanism driven by impact. Based on the equivalent viscous damping theory and using curve fitting to describe the rule of the dissipation factor of damping alloy changing with stress, the nonlinear constitutive relation of Zn-27Al-1Cu damping alloy is given. The nonlinear spring damping contact model is adopted to describe the contact force of the clearance joint.Based on the nonlinear finite element contact theory, the outer impact contact force between the mechanism and its working environment is analyzed, and a coupled dynamic model of structural impact and mechanism motion with clearance joint is put forward. A dynamic model is established for the cannonball transport mechanism partly adhering Zn-27Al-lCu damping alloy layer and constraint layer under complex impact conditions. At last, the feasibility of the method presented is proved by numerical simulation.     

土木工程专业创新性应用型人才培养的探索与实践——以徐州工程学院为例

以新建本科院校徐州工程学院为例,首先分析土木工程专业创新性应用型人才培养的适应性现状,然后,提出创新性应用型人才培养的定位与总体要求,最后,结合本校的实际情况,从课程建设与改革、实践教学基地与平台建设、教学方式与方法改革及师资队伍建设四个方面入手,详细阐述了该校土木工程专业创新性应用型人才培养模式,为同类新建本科院校提供参考。     

载金炭解吸过程中热电偶位置及其设定值的确定

本文通过载金活性炭解吸电解工业性试验和理论计算分析，认为温控仪的设定值若选定在正好等于载金炭解吸作业所要求的温度，那么热电偶无论安装在解吸柱上的任何位置都不合适。若把热电偶安装在解吸柱的最下方或电加热器中的任何位置，都将使加热器启动频繁，这在生产中也不可取。热电偶位置及其设定值的合理确定与解吸作业的许多条件有关，只有通过工业试验或理论计算才能最终确定。     

国产1000m/min纸机基础板的安装

本文主要就造纸机的基础板安装方案、基础板安装规范和安装实施等过程作详细介绍.     

共建校企联合实验室,提高研究生创新能力

共建产学研合作联合实验室,建立研究生创新能力培养的平台,是高素质人才培养的重要途径。课题组结合重庆地方产业实际和企业自主创新能力建设的需要,建立了校企共建联合实验室,并建设成为了重庆市级企业技术中心和国家级企业技术中心,提高了学生的综合素质,取得了较好的研究成果,为企业带来了良好的经济效益。为增强产学研合作的力度,改革高校对教师和学生考核方式,建立合理的激励机制是值得探索的问题。     

渐变组分a-Si∶H/a-SiC∶H膜内部电场的研究

本文报导了渐变组分 a-Si∶H/a-SiC∶H 膜的制备,研究了渐变膜的电学、光学特性,用 EHT 方法对 a-Si∶H 和 a-SiC∶H 的能态密度进行了计算。提出该渐变膜是一种连续变带隙材料,其内部存在自建电场,并从实验上确定了自建电场的方向。     

基于RCM 的导弹装备最佳预防性维修周期决策

针对目前确定预防性维修周期时存在不确定性的问题,建立了基于RCM的导弹装备维修周期决策模型。分别以总费用最小和可用度最大为目标建立导弹装备维修周期决策模型,采用蒙特卡罗仿真进行模型求解,采用模糊决策方法确定多目标综合最佳预防性维修周期,并以某型导弹装备密封圈为例,验证方法的有效性。实践分析结果表明:该方法综合权衡了费用和可用度因素,能较好地解决可用度低下且维修费用居高不下的问题,有一定应用和参考价值。