钠基膨润土胶质价测试方法的改进

以两种人工钠化膨润土为研究对象,探讨了文献胶质价测试方法的不合理性、取土量和MgO量这两个关键因素。实验结果表明:用常规100 mL量筒测胶质价时,取土量和MgO量影响较大,有必要针对具体试样做条件试验,最佳条件是1#钠土为取3.00 g土、0.2 g MgO,2#钠土为取5.00 g土、0.33 g MgO。     

常用预应力锚索的结构和特点

3．2施工中要注意的问题 3．2．1锚固段钢绞线的清洗拉力型锚索的拉力是依赖钢绞线与注浆体的粘结力经由注浆体传递给孔周的岩体,因此,锚固段钢绞上的油脂必须清洗干净。钢绞线上的防锈脂已渗入7根钢丝的内部空间,不能只清洗表面,必须把钢绞线散开,7根钢丝分别洗干净后再复原。这样做很麻烦,仅适用于锚索量小的工程。对于大型边坡工程,宜采用在封闭容器内用90℃以上高温水喷射清洗,这种方法不用散开钢绞线而且洗得干净;     

Ersatzneubau der Kajen im Marinestützpunkt Wilhelmshaven

Replacement construction of quays at the naval base in Wilhelmshaven At the naval base of Wilhelmshaven the quay walls and dolphins of a floating bridge system are being renewed. The existing quays show extensive damage and stability deficits. In particular, microbially induced corrosion (MIC) on the back of the old sheet piling lead to rust corrosion of the old sheet pile walls. Content of the report is the conceptual and structural implementation of the measure quay renewal that has been executed since the beginning of 2013. Special attention is paid to the security of the stock during the construction period, the selected corrosion protection measures as well as the requirements for the installation of combined sheet piling.     

Untersuchung von Schlosssprengungen an ausgeführten Ufereinfassungen mit kombinierten Spundwänden

Interlock failure of combined sheet pile walls In addition to multiple combinations of king piles and intermediate sheet piles the installation method of combined sheet pile walls can differ as well. The installation has to adapt to the boundary conditions of the construction work considering soil conditions, profile and interlock system, interlock protection, driving equipment, driving assistance etc. Despite the established construction of combined sheet pile walls interlock failure occurs. In this paper, the installation aspects of combined sheet pile walls in northern Europe are compiled and analyzed for the occurrence of interlock failure.     

本科生国际化培养模式探索——以北京航空航天大学土木与机场工程专业为例

北京航空航天大学土木与机场工程专业自2012年开设本科生国际化实验班以来,突出学校航空航天基础设施建设特色,综合中英文课程体系、国际暑期学校和国际交换学习完成授课内容。在人才培养上,注重参加科技竞赛,依托科研项目,辅以名师学术报告、学术会议等全方位提高学生的国际视野,激发创新思维,培养综合型高端人才。     

Continuous monitoring of the dynamic behavior of a high‐rise telecommunications tower

This article describes the experimental evaluation of the dynamic effects induced by wind on a high‐rise telecommunications tower based on a permanent monitoring system. Monte da Virgem telecommunications tower is located near the city of Porto (Portugal), and its structure consists in a reinforced concrete shaft and a steel mast, with a total height of 177 m. The monitoring system includes accelerometers, anemometers, and a meteorological station, allowing the characterization of the maximum accelerations of the structure and wind regimes during a period of 6 months. The analysis of the results enabled identifying specific events, denominated as critical events, for which the dynamic response of the tower under wind actions appears significantly amplified due to wind aeroelastic instability phenomena in the steel mast. The automatic identification of the critical events was based on the application to the acceleration's records of an autoregressive model and estimation of its optimal order number based on a singular value decomposition. The results proved the robustness and efficiency of the proposed technique in identifying the number, duration, and maximum amplitude of accelerations associated to the critical events, envisaging its potential integration in structural health monitoring systems.     

血清 AFU、LAP 及 GGT 联合检测在早期原发性肝癌患者诊断中的应用价值

目的：探讨血清α-L-岩藻糖苷酶（AFU）、亮氨酸氨基肽酶（LAP）、r-谷氨酰转移酶（GGT）联合检测在早期原发性肝癌患者中的诊断价值。方法对85例肝病患者（肝硬化组45例、早期原发性肝癌组40例）及40例健康体检者（健康对照组）的血清 AFU、LAP 及 GGT 含量进行检测。结果早期原发性肝癌组、肝硬化组血清 AFU、GGT 的含量均高于健康对照组（均 P ＜0．05）。早期原发性肝癌组的 LAP 含量明显高于健康对照组,血清 AFU、LAP、GGT 单项检测及 AFU＋LAP＋GGT 联合检测阳性率均明显高于肝硬化组及健康体检组（均 P ＜0．05）,其中 AFU＋LAP＋GGT 联合检测阳性率最高（92％）。肝硬化组与健康对照组 LAP 含量比较差异无统计学意义（P ＞0．05）。结论AFU＋LAP＋GGT 联合检测有利于原发性肝癌的早期诊断。     

关于如何做好市政工程造价控制管理工作的研究

本文简单分析了市政工程项目各个阶段的造价控制管理中存在的不同问题,并针对上述问题提出了几点相应的造价控制措施,包括做好投标签约工作、充分的施工准备、狠抓施工成本控制、重视竣工收尾工作等,为市政工程的管理人员提供一定的参考。