多层复合木模板在中源大厦框架中的应用

主要介绍多层复合木模板在中源大厦地下室及框架中的应用,具体说明了施工所用材料、机具、施工准备及施工工艺、质量控制,该模板在工程施工中使用的优势,效益及使用效果、使用体会,该模板在工程中的应用前景.     

数控程序的便携式传送

数控程序的便携式传送装置,通过USB接口将数控程序按约定格式转存到便携式传送装置U盘中,再携带U盘到指定数控机床,通过RS232接口以既定通信协议将数控程序传送到数控机床中.     

基于X9241的瞄控台自动控制器设计

瞄控台自动控制器由AT98C2051、电桥和电压比较电路及数控电位器X9241组成.单片机根据电压比较电路敏感电桥两臂不平衡电压输出信号的正负极性控制X9241,实现电桥平衡和控制器的自动调节.X9241采用二线串行I2C总线与单片机传递数据.其软件由主程序、中断子程序组成.     

城市河流地区生态环境规划研究--以温瑞塘河为例

以温瑞塘河沿岸地区生态环境保护规划为例．阐述了城市河流地区的生态环境保护．应将对河流的生态环境的保护和对沿岸地区土地利用的生态化控制和整合紧密结合的思路。     

高等级沥青混凝土路面机械施工质量的控制

针对高等级沥青混凝土路面的技术要求，从机械配套、沥青混合料的拌和、摊铺、碾压、机械施工组织管理等五个环节提出了质量控制方法，以保证所铺设路面的高质量。     

Flutter control effect and mechanism of central-slotting for long-span bridges

The flutter control effect and mechanism of central-slotting, which have gradually been adopted in the design and construction of long-span bridges as an effective flutter controlling measure, were investigated with theoretical analysis and wind tunnel test. Five basic girder cross-sections representing five typical aerodynamic configurations were selected and central-slotted with two different slot widths. Then, a series of sectional model tests and theoretical analyses based on the two-dimensional three-degrees-of-freedom coupling flutter analysis method (2 dimension-3 degrees of freedom method, 2d-3DOF method) were carried out to investigate the aerody namic performance, flutter mechanism and flutter modality of the five basic sections and their corresponding central-slotted sections. The results show that central-slotting can not always improve the aerodynamic stability of bridge structure. The control effect of central-slotting depends on the aerodynamic configuration of the original girder section and the corresponding central-slotting width. If the original section is inappropriate or the slot width is unsuitable, central-slotting will even deteriorate the structural flutter performance. Theoretical investigations indicated that the differences in flutter control effects come from the different formation and evolution of aerodynamic damping, and flutter modality especially the participation level of heaving motion also has a significant influence on the control effect of central-slotting. __________ Translated from China Civil Engineering Journal, 2006, 39(7): 74–80 [译自: 土木工程学报]     

水泵变频调速方案计算机辅助论证

分析了变速泵和定速泵并联运行的特性，介绍了水泵变频调速方案计算机辅助论证软件的计算方法，结合工程算例，比较了几种水泵组合方案的技术经济性。     

黄土灰土地基的质量控制系统试验研究

对黄土灰土的物理力学性质和黄土灰土地基施工过程中的质量控制要点进行了试验研究。分析了各种因素的影响程度和影响结果 ,发现灰土不但有最优含水量而且有最佳含灰量问题。同时在施工过程中灰土地基的虚铺厚度、碾压过程及碾压间隔时间等都对施工质量产生一定的影响。     

面向管理的公共空间设计控制

城市公共空间因具有强烈的公共属性而具备了公共干预的法理基础,必须建立制度化的设计控制来保障公共利益不受损害.公共空间设计控制的制度化包括依据的制度化、内容的制度化和审查的制度化.     

火灾报警控制器专用电源的设计

介绍了开关电源的优点及分类，从火灾自动报警控制系统对电源的要求出发，设计了一种单端反激式的开关电源，提出了一种新的电源故障检测方法。