苯系物溶解度和分配系数的测定与估算

采用气相色谱的分析技术,用摇瓶法分别测定了苯,甲苯,乙苯的溶解 度（Sw)和分配系数（KOW）。结果表明,溶解度和分配系数之间存在线性关系：lnKow=0.4558-0.9176lnSw。并且运用结构法和摩尔体积法估算了苯及其简单同系物的溶解度和分配系数,估算结果与实验结果能较好吻合,说明估算法是一种简便、可靠的方法。     

流动注射-化学发光法测定阿昔洛韦和更昔洛韦

目的确定以Ce(IV)-罗丹明B体系测定制剂中阿昔洛韦和更昔洛韦的流动注射-化学发光(FI-CL)分析方法。方法硫酸介质中Ce(IV)与阿昔洛韦/更昔洛韦发生氧化-还原反应而产生化学发光,罗丹明B可显著增强其发光信号,且增敏效果与阿昔洛韦/更昔洛韦浓度呈一定的线性关系。据此,建立了测定注射剂中阿昔洛韦和更昔洛韦的流动注射-化学发光新方法。结果阿昔洛韦在3.0×10-5g/L-7.0×10-2g/L范围内呈线性关系,检出限为1.56×10-5g/L;更昔洛韦在5.0×10-5g/L-7.0×10-2g/L范围内呈线性关系,检出限为2.35×10-5g/L。通过对质量浓度为1.0×10-3g/L的阿昔洛韦和更昔洛韦分别进行的11次平行测定,其相对标准偏差(RSD)分别为2.08%和2.83%。结论该方法线性范围宽、灵敏度高,简便快速,也是目前首次采用流动注射-化学发光法对更昔洛韦含量的测定。     

Determination of partial safety coefficients of structural reliability based on contaminated distribution

Partial safety factors must be evaluated precisely for the given target reliability index to ensure the certain level of structural reliability due to uncertain factors. The current studies of partial safety factors do not consider human error in construction for structural reliability. A mathematically model should be improved to simulate the partial safety coefficient concerned uncertainty factors which concern the effect of human error in construction. We employ the contaminated distribution to obtain the realistic mean value and standard variance of variable of structural parameters which coexist with random error human error. The reasonable partial safety coefficient can be calculated based on the realistic value of structural parameters concerned the effects of random error and gross error.     

Surface reconstruction of scanned human body using radial basis functions and adaptive partition of unity

It is important to reconstruct a continuous surface representation of the point cloud scanned from a human body. In this paper a new implicit surface method is proposed to reconstruct the human body surface from the points based on the combination of radial basis functions (RBFs) and adaptive partition of unity (PoU). The whole 3D domain of the scanned human body is firstly subdivided into a set of overlapping subdomains based on the improved octrees. The smooth local surfaces are then computed in the subdomains based on RBFs. And finally the global human body surface is reconstructed by blending the local surfaces with the adaptive PoU functions. This method is robust for the surface reconstruction of the scanned human body even with large or non-uniform point cloud which has a sharp density variation. Foundation item: the National Natural Science Foundation of China (No. 50575139) and the Shanghai Special Fund of Informatization (No. 088)     

灌砂法检测路基压实度准确度的控制方法

对现场灌砂法检测压实度存在的问题进行了分析,着重论述了实验中应该注意的问题,使得灌砂法得到了进一步的完善。     

变系数二阶常微分方程的边界层型问题的插值摄动解法

用插值摄动法[1]求得了变系数二阶常微分方程的边界层型问题的一级近似解．由于该方法能公式化（如式（10））,故其计算过程显得十分简便．其精度甚至比多尺度法的还稍高一些.     

A new method of transmission network flexible planning using the connection number

Because connection number can express and process synthetic uncertainties caused by various uncertainties in the transmission network planning, a connection number model (CNM) was presented to compare the values of connection number logically. This paper proposed a novel model for transmission network flexible planning with uncertainty. In the proposed planning model both certainty and uncertainty information were included, and the cost-benefit analysis method was used to evaluate the candidate schemes in the objective function. Its good adaptability and flexibility were illustrated through two examples.     

基于收敛约束原理的大断面黄土隧道围岩与初支稳定性分析

黄土特殊的工程性质决定了黄土隧道结构的受力复杂性．大断面黄土隧道由于开挖断面大,开挖方法一般采用台阶法或交叉中隔壁法（CRD）．因此,沿用传统的观测点布置方法进行测点布置和位移观测,存在一定的困难．收敛约束法应用方便,思路明确．用收敛约束法对隧道初期支护进行稳定性分析,不仅能正确地反映隧道施工中的各种力学现象和过程,还能弄清楚围岩与支护“相互作用”和“动态作用”的特点．本文基于收敛约束原理,结合现场实测数据,对兰渝高铁某大断面黄土隧道的围岩稳定性和初支的安全性进行评价．为隧道的后续施工．提供参考．     

用变点分析方法评价城市公共汽车预防维修效果

维修保养的效果影响车辆的运行可靠性和维修费用.基于现场数据,采用变点分析方法,分析汽车二级保养和三级保养前、后失效发生率的变化,并由此评价车辆不同级保养的效果.该方法可为企业维修质量的改进提供依据.     

浅谈黑北公路膨胀土填筑路基的处理方法

随着我国经济的高速发展，近几年公路建设大规模展开，高速公路迅速发展。在公路修建中，经常遇到要通过膨胀土地区的情况。黑河至北安(二井子)段公路，同样也遇到了通过膨胀土地段的情况。由于膨胀土具有遇水膨胀，失水收缩的特性，极易造成公路病害，且经济损失巨大。对已建成的公路调查资料表明，因为膨胀土的病害处理不当造成的路基变形、滑坍等现象时有发生，影响了工程技术人员和社会各界人士对工程质量的正确评价和公路的正常使用。为减轻膨胀土对公路的危害，减少经济损失，根据黑北公路通过膨胀土地段的实际情况，采取了以下几种处理方法。     

连拱隧道沉降预测的正交多项式拟合方法

提出了描述连拱隧道沉降量S和施工时间t函数关系的正交多项式拟合方法.基于数值逼近原理,并根据现场量测数据,构造正交函数族{Pn(x)}并确定其权值ω(xi),求解得到S-t函数关系式.随着新观测数据的不断加入,及时修改预测模型参数值,达到实时预测之目的.研究结果表明,通过构造正交多项式来预测隧道的沉降,数值计算更加稳定,预测结果比较准确,在实际应用中方便可行.