预应力梁钢管脚手支撑方案设计

为防止由于器具质量不符合施工规范,导致模板支撑体系坍塌事故,对模板支撑进行设计和验算,同时对模板支撑的施工验收。通过按模板支撑的设计和交底要求施工,并经过实践检验,支撑体系安全可靠。     

A Novel Polymethyl Methacrylate （PMMA）TiO2 Nanocomposite and Its Thermal and Photic Stability

A new kind of polymethyl methacrylate （PMMA）-TiO2 nanocomposite was synthesized through polymerization. The thermal and photic stability of this PMMA TiO2 nanocomposites were investigated. The as prepared samples were characterized by scanning electron microscopy （SEM）, UV-Vis spectroscopy, differential thermal analysis （DTA） and the photo-induced weight loss, The results show that the photostability of the PMMA-TiO2 nanocomposite is higher than that of the pure PMMA under UV-light irradiation, The weight loss of the pure PMMA reaches 30 % after 300 h UVirradiation, while the composite only 0.3% under the identical experimental condition. The glass transition temperature （TR） of pure PMMA is only 80℃, while the Tg of the composite reaches 258℃. Compared with pure PMMA, the thermal stability of the composite is greatly enhanced.     

PEAK COVARIANCE STABILITY OF A RANDOM RICCATI EQUATION ARISING FROM KALMAN FILTERING WITH OBSERVATION LOSSES

We consider the stability of a random Riccati equation with a Markovian binary jump coefficient. More specifically, we are concerned with the boundedness of the solution of a random Riccati difference equation arising from Kalman filtering with measurement losses. A sufficient condition for the peak covariance stability is obtained which has a simpler form and is shown to be less conservative in some cases than a very recent result in existing literature. Furthermore, we show that a known sufficient condition is also necessary when the observability index equals one.     

劳动力投入对中国建筑业影响的实证分析

本文是以基础的计量经济学分析工具，通过建立多元线性回归模型，对影响中国建筑业的因素作了初步的讨论。经过对相关变量的筛选，得出了影响建筑业的两个重要因素，在此基础上得出一个二元回归模型，并就模型进行分析，实证分析了一些基本结论。     

东露天铁路专线采空区治理对策研究

针对东露天铁路专线所经过的采空区特点,分析了典型采空区上覆岩层的稳定性和上覆岩层移动形式,提出该地区采空区的治理措施。     

无缝线路稳定性探讨

从无缝线路稳定性研究意义、研究理论着手,分析探讨了影响稳定性的因素,提出提高无缝线路稳定性的措施。     

起动用铅酸蓄电池试验需注意的几个问题

本文主要讨论了起动用铅酸蓄电池试验时的几个注意点以及对检验结果造成的影响。     

葡萄酒月度价格指标的季节ARIMA时间序列分析

以时间序列分析为工具,研究了法国葡萄酒价格月度指标,使用基于周期图的Fisher检验证实该数据指标具有潜在周期,最后发现(1,0,0)×(1,0,0)12模型能较好地拟合数据.在此基础上给出相应的预测.     

数学期望模型应用实例

混合样本检验法是预防医学中常用的方法，通过建立数学期望模型，可以在定量分析中减少检测次数，达到减少工作量，提高工作效率的目的。     

一种由负定函数dV（x）／dt判定动态系统原点稳定性的方法

提出一种由负定导函数判定动态系统稳定性的方法，给出在已知导函数为负定的情况下系统稳定或者不稳定的充要条件，以及一组使用该方法的例子。