ELLIPSOMETRY OF BLACK LIPID MEMBRANES OF EGG LECITHIN AND CHLOROPLAST EXTRACTS

Abstract— Ellipsometric angles and reflectivity of black lipid membranes containing either egg lecithin or chloroplast extracts were measured at a wavelength of 6328 Å. Evidence was found for positive uniaxial anisotropy in membranes of lecithin. If the thickness of those films is assumed to be 62 Å, the refractive index normal to the film surface is 1.471 ± 0.004, and the refractive index parallel to the film surface is 1.454 ± 0.003. The results for membranes of chloroplast extracts also indicate a positive anisotropy in the indices of absorption.     

β-环糊精对几种氧化体系的影响

本文以偶氮染料橙黄Ⅱ为对象,染料脱色速率为指标,研究了β-环糊精(β-CD)对TiO2／Vis、铁(Ⅲ)—草酸盐配合物(Fe(Ⅲ)-Ox)／Viss、H2O2／UV和Fenton四种氧化体系氧化能力的影响作用。结果表明：β—CD的加入可提高TiO2对染料的光催化脱色能力,抑制其余三种氧化体系对染料的氧化脱色能力。     

共沉淀法制备不球磨稀土磷酸盐绿色荧光粉研究

报道了共沉淀法制备LaPO4:Ce,Tb绿色荧光粉的工艺。运用热分析仪，X射线衍射仪，光谱仪和激光粒度仪对其差热、结构、发射光谱和粒度进行了研究。结果表明：该法制得的LaPO4:Ce,Tb绿色荧光粉灼烧温度低，无杂相，颗粒适中，不需球磨可直拉用于涂管。     

广义活动网络ETI支付进度计划问题的研究

优化ETI支付进度安排是消除承包商和业主由于进度安排原因而产生经济纠纷,实现双赢的最有效方法.本文分析了活动间广义时序关系的类型,建立了广义时序关系下活动间的约束关系;在考虑承包商和业主双方联合收益要求的基础上,提出了双方的净现值按同比例减小的折衷原则,构建了广义活动网络在ETI支付方式下的支付进度计划模型;最后通过一个算例进行了分析,验证表明该优化模型具有较好的有效性和实用性.     

多目标资源受限项目鲁棒调度研究

由于资源受限项目调度属于NP-hard问题,传统的RCPSP主要集中于工期最短单一目标的基本问题研究,而忽略了项目调度对鲁棒性等多目标属性特征的要求。本文以经典的串行进度生成机制为基础,引入了衡量项目稳定性的鲁棒性要素,创建了项目鲁棒调度串行生成机制(RSSGS),提出了项目鲁棒性的测度新指标,构建了优化鲁棒结构的工期最短和鲁棒性最大的双目标优化模型,并结合分层优化原理,设计了改进的SA算法。最后,采用算例验证了该模型的可行性和合理性。     

基于多层多道焊的弧焊机器人视觉信息提取及处理

介绍爬行式弧焊机器人三维视觉信息的传感原理。研究了拉普拉斯锐化、细化等措施对图像处理的效果。给出型坡口多层多道焊边缘坐标的确定以及纠偏量和深度值的计算方法，实验说明效果较好。     

用线阵CCD标定光纤端部位置

为了标定光纤端部在平面上的位置，采用线阵ＣＣＤ 对光纤的出射光进行扫描，对于接收到的数据采用重心法进行处理，并通过改变实验条件以达到较为理想的结果。     

冲击接触问题的一种双共振投影梯度算法

根据冲击接触计算模型所需满足的基本控制方程和非线性互补条件,应用非线性互补问题与约束优化的等价关系将非线性互补接触问题转变成一个非线性规划问题,系统地推导建立了冲击接触问题的一种双共轭投影梯度计算方法．增广Lagrange乘子法克服了罚函数要求减小迭代步长以达到计算稳定的限制,即使对于冲击接触问题亦可以采用较大迭代步长,在形成的与原互补问题等价的无约束规划模式下,应用双共轭投影梯度算法提高非线性搜索速度和计算效率．算法模型计算结果表明,所建立的双共轭投影梯度计算理论及方法是正确有效的．     

Free energy from molecular dynamics with multiple constraints

In molecular dynamics simulations of reacting systems, the key step to determining the equilibrium constant and the reaction rate is the calculation of the free energy as a function of the reaction coordinate. Intuitively the derivative of the free energy is equal to the average force needed to constrain the reaction coordinate to a constant value, but the metric tensor effect of the constraint on the sampled phase space distribution complicates this relation. The appropriately corrected expression for the potential of mean constraint force method (PMCF) for systems in which only the reaction coordinate is constrained was published recently. Here we will consider the general case of a system with multiple constraints. This situation arises when both the reaction coordinate and the ‘hard’ coordinates are constrained, and also in systems with several reaction coordinates. The obvious advantage of this method over the established thermodynamic integration and free energy perturbation methods is that it avoids the cumbersome introduction of a full set of generalized coordinates complementing the constrained coordinates. Simulations of n-butane and n-pentane in vacuum illustrate the method.