Research on vertical deformation during construction of Shanghai World Financial Center

Shanghai World Financial Center is one of the highest buildings in the world, of which cumulation of vertical deformation during construction is significant and worth investigating. A refined finite element model was developed to conduct full-process analysis of construction of super-high rise buildings like Shanghai World Financial Center, in which the discrete analysis method of time-varying structures and age-adjusted effective modulus method were both used. In the finite element analysis, the whole construction process was divided into a series of stages, each with a structural system that is a part of the whole structure and with different material parameters, geometrical parameters, loading and boundary conditions. The whole construction process of Shanghai World Financial Center in consideration of creep of concrete was simulated successfully by using the finite element model and the analytical method developed. With respect to different construction stage, the total vertical deformation, inter-floor compression deformation and the relative deformation between the outer frame and the core-wall were obtained through the analysis. The comparison between the results from the stage-wise full-process analysis of construction with and without considering the creep and the results from the conventional analysis of the whole building under the total load from all self-weight and construction applied to the structure "in one go" shows that the cumulative effect on the deformation from the construction process and the creep effect need to be considered in analyzing the deformation of Shanghai World Financial Center, and the super-high rise buildings suchlike. Finally, the simulation results correlate well with the monitoring results-a proof of the feasibility and the validity of this paper.     

人——组织匹配研究综述

通过回顾大量文献,本文梳理了人-组织匹配的定义、测量方法,并分析了各个测量方法的优缺点。最后,总结了个人-组织价值观匹配对员工行为态度的影响。     

加速溶剂萃取/GC-ECD分析土壤中多氯联苯的研究

为研究加速溶剂萃取土壤中的多氯联苯的方法,以土壤中8种多氯联苯为标样,进行了加速溶剂提取实验,并用佛罗里硅土柱净化,再用GC ECD气相色谱仪测定。实验优化了萃取条件,在20 g土壤样中添加50 ng多氯联苯混标,在实验温度100℃,萃取压力为10.3 MPa,萃取时间为20 min条件下用35 mL丙酮/正己烷混合液提取,并用GCECD测得多氯联苯回收率为95.63%~100.2%;相对标准偏差为0.95%~9.58%;方法检出限为0.089~0.882 ng/g。为进行比较,同时进行了超声波辅助提取和索式提取实验。结果表明:加速溶剂提取时间短,有机溶剂用量少,并且提取回收率高。     

基于测试方法的ADSL环境下的视频应用匹配

针对目前流行的视频应用软件在广域范围内基于ADSL传输的传输特性进行了研究，对软件特性和网络环境的相互作用机制进行了研究，并通过实际测试进行了验证。     

离子络合法制备ZnO纳米线

通过高聚物PAM与锌盐发生离子络合反应 ,将络合溶液涂膜在单晶硅片上 ,再通过烧结使之生长出ZnO纳米线。用场发射扫描电子显微镜 (FE SEM )、X射线衍射 (XRD)、红外光谱 (IR)对所得样品的结构与形貌进行分析表征 ,结果表明ZnO纳米线直径约 6 0～ 80nm、长度约 1～ 2 μm ,单晶 ,为六方晶系 ,且沿c轴方向优先生长。     

利用CCD实测数据恢复弹形的方法

根据线阵CCD的工作特性,通过对弹丸CCD试验数据进行分析,提出了一种完整的弹丸图像恢复方法,包括阈值法提取数据、二维自适应除噪滤波、样条函数曲线拟合、微分边缘识别等。应用表明该方法具有简单、稳定、可靠、精度高的特点,在弹形恢复中取得了满意的结果,为测定弹丸飞行参数奠定了基础。     

一个灵活的多级事务模型FMTM及其在EJB上的实现

文章提出一种灵活的多级事务模型FMTM,与其它强调数据库为中心的模型不同,FMTM更强调以用户为中心,从而具有很好的灵活性,可以刻画从松驰到严格的各种事务要求。FMTM在商业产品Worms中的实现显示了FMTM的实用性。     

火电厂凝汽器管内水垢的自动清洗技术研究

根据对火电厂的调查结果,认为管内水垢严重影响了凝汽器的运行效率;分别对自动清洗技术的清洗功能和强化传热能力进行了模拟实验,并从理论上分析了污垢厚度对真空度的影响。     

回归法对鲍罗米公式中A,B值的求导

新水泥胶砂的检验方法使原混凝土配合比计算中的鲍罗米公式待定系数已不能适用，根据本单位建材试验的统计资料，通过回归分析，建立了适合天津本地区的鲍罗米公式．     

微机保护装置现场调试的有关问题分析

微机型保护装置以其灵活性强、可靠性高、调试方便等特点得到广泛应用。结合现场调试中 的有关问题进行了分析,并提出改进措施。