基于两棱镜模型的盾构引导系统开发与研究

目前国内外常用的盾构自动引导系统是基于三棱镜模型,通过测量3个棱镜解算切口盾尾的坐标。提出2个棱镜加上倾斜仪的盾构自动引导系统模型,利用双轴倾斜仪读取俯仰角和扭转角,根据盾首盾尾以及两个棱镜的空间位置关系用空间解析几何方法推导了盾构姿态解算方法。其解算过程简单,易于程序实现。该模型在工程中取得了良好的应用效果,避免了三棱镜模型的不足。     

图像边界检测区域对比度模糊增强算法在轮廓提取中的运用

分析了图像边界检测的区域对比度模糊增强算法的特点，通过实验验证了该算法的正确性和可行性，并指出了算法的一些不足之处和待改进的地方，提出了一种适用轮廓提取的新广义算子。     

ZD(J)9型电动转辙机锁闭机构改进措施

现场使用的ZD(J)9型电动转辙机出现过操纵道岔完成锁闭时锁闭增力动程过大,造成道岔密贴表示不准确的状况。通过分析锁闭机构增力动程,设计出新的转辙机锁闭结构,可有效解决锁闭增力动程过大导致的道岔密贴表示不准确问题。     

基于有限元方法的某楔形制动器总成优化

某楔形制动器总成制动过程中存在发热、抱死故障,严重制约着国产大吨位汽车起重机系列用桥的市场推广进程。为了解决这些故障,对某楔形制动器总成进行了优化设计,通过有限元分析,得出合理的改进设计方案,为楔形制动的设计提供了参考。     

磴口黄河特大桥0号块空间应力分析研究

采用大型通用有限元软件MIADS FEA进行空间计算,以磴口黄河特大桥为工程实例进行研究。用三维有限单元法对连续梁桥0号块作分析,对施工中0号块在最大悬臂状态下和成桥阶段的应力作计算,计算出各阶段0号块的应力状态,为优化设计和改进施工方法提供依据。对运营节段0号块在最不利荷载组合作用下的应力作计算,计算出0号块的应力状态。     

Calculation of Transient Stress Field During Laser Transformation Hardening Process

IntroductionHighpowerCOzlaserssdsetransformationhardeningtechniquehasbeensuccessfullyusedinindusnyforWYears.BecausethetemPeratUrefleldislocalizedinmaterialdurllglasertransfonnationhMngProcess,highthermstrCsswillgenerateinmatgrialduringlasertfansformationhardeningProcess.Therisalsohighresidualstressinmaterial,bothintCnsionandcomPression['-'].ComPressresidualstressishelptoincreasethefatigueldrimeofthelasertreatedmaterial,butthetensilestresswillshortenthefatiguelifetmeofthelasertreatedmator…     

在基建工程中怎样做好内部审计工作

社会主义市场经济的迅速发展，给建筑市场带来了生机与活力，各地区、各单位的建设项目也明显增多，但工程项目投资浪费、工程质量低劣以及权钱交易的腐败行为也随之而来，因此，在新形势下如何使工程造价更加合理地确定和有效控制，     

大跨度钢拱肋整体吊装施工

大跨度钢拱肋在以前大都是分三到五段吊装,在空中进行拼接。这种吊装方法的缺点是:(1)在河道中搭设临时支撑,会影响河道通航;(2)施工工期长;(3)空中拼接时,接头的焊缝质量没有在地面焊接好;(4)空中作业多,安全风险增大。该文介绍了上海川杨桥的83m跨系杆拱桥钢拱肋采用整体吊装施工工艺,较好地解决了上述问题。该施工工艺对今后类似工程的施工有一定的参考价值。     

A model of household time allocation taking into consideration of hiring domestic helpers

Household maintenance such as childcare not only induces activities and travel but also impose time constraints on individuals’ participation in other activities and travel. Instead of sharing household responsibilities, households may hire domestic helpers for household maintenance. Alternatively, they may get helps from members of the extended family such as parents of household heads. This paper develops a model to analyze households’ trade-offs between hiring domestic helpers for household maintenance and taking these responsibilities by household members. We will apply household economic theories to develop a time allocation model incorporating interactions among household members. We assume that households trade off the money they are willing to spend for hiring helpers with the time they may need to spend for household maintenance activities to maximize utilities, subject to time constraints. The model may be used to analyze the impacts of domestic helpers on household members’ time allocation to subsistence, maintenance and recreation activities. It may also be applied to analyze the impacts of government policies regarding the minimum salary of domestic helpers and the change of household members’ wage rates on households’ decision to hire helpers. The paper extends the current literature on intra-household activity–travel interactions by considering external helps from domestic helpers, which may contribute to the understanding of activity–travel patterns of household members.     

公交专用道设置标准研究——以南昌市为例

对公交专用道设置的重要影响因素进行交通工程学分析,确定各因素基本阈值。以设置规模为约束条件.建立南昌市交通模型,对各影响因素进行组合分析,以此确定各类组合条件阈值.形成南昌市公交专用道设置标准。