可控式循环通断程序的算法

本文重点介绍了采用梯形图编写的一个程序算法,使用该算法,可以解决高炉上料时,由于炉料中粉末多而引起的高炉悬料情况的发生.     

苯乙烯/二氧化碳/聚苯乙烯三元混合物的相平衡预测

A lattice fluid model,Sanchez-Lacombe equation,is used to predict the phase behavior for a styrene/CO2/polystyrene ternary system.The binary parameters involved in the equation were optimized using experimental data.Phase diagrams and the distribution coefficients of styrene between polymer phase and fluid phase are obtained over a wide rang of pressure,temperature and composition.The analysis of ternary phase diagrams indicates that this system at relatively high pressure or low temperature may display two-phase equilibrium,and at low pressures or high temperatures three-phase equilibrium may appear.The distribution coefficients of styrene between the fluid phase and the polymer phase increase asymptotically to unity when the concentration of styrene increases.The results provide thermodynamic knowledge for further exploitation of supercritical carbon dioxide assisted devolatilization and impregnation.     

AutoCAD在建筑给排水系统图设计中的应用技巧

本文结合建筑给水系统图的特点,从绘制图例、确定主体管线、添加注释等方面介绍了运用AutoCAD软件进行建筑给排水系统设计图绘制的方法、技巧。     

Conformational disorder in the Brill transition of uniaxially-oriented nylon 10/10 sample investigated through the temperature-dependent measurement of X-ray fiber diagram

X-ray fiber diagram of uniaxially-oriented nylon 10/10 sample has been measured at the various temperatures. The 11th layer line originating from the methylene zigzag sequences became diffuse above the Brill transition region (140-170 °C), while the layer reflections corresponding mainly to the original repeating period of the parent nylon chains were kept almost unchanged. This observation makes us confirm that in the Brill transition region, the conformational disordering occurs in the methylene sequential parts with keeping the repeating period of the whole skeletal chain by still forming the intermolecular hydrogen bonds between the amide groups of the neighboring chains. This conclusion is consistent with the already-reported infrared spectral data. The characteristic X-ray diffraction patterns observed at the various temperatures were reproduced well by a computer simulation technique utilizing the previously-reported molecular dynamics calculation results.     

高矣物的特性对双水相相图和头孢氨苄及7-ADCA分配行为的影响

A series of ethylene oxide(EO)-propylene oxide (PO) random co-polymers (EOPO) were used to form aqueous two-phase systems (ATPS) with ammonium sulfate.Effects of EOPO′s properties on the phase separation behaviors and on the partition of cephalexin and 7-aminodesacetoxicephalosporanic acid(7-ADCA) in ATPS were investigated.Both the molar mass and molar ratio of EO to PO of EOPO could greatly influence partition behaviors of cephalexin and 7-ADCA as well as the binodal curve of ATPS. With the increase of molar mass of co-polymer or the decrease of molar ratio of EO to PO,the critical point of ATPS decreased,the binodal curve became more asymmetry,and both cephalexin and 7-ADCA followed the same tendency to partition into the polymer-poor bottom phase.The experimental results shows that it is feasible to partition cephalexin and 7-ADCA in either the polymer-rich top phase or the polymer-poor bottom phase by choosing a specific phase-forming EOPO.     

Excel电子表格在土工试验中的应用

以Excel电子表格实现试验中所需数据的筛选、查找,进行相应计算。详述电子表格在土工试验中的实用性和高效性。     

FeSO4微乳液的制备

选择合适的乳化剂和油相成功制备了FeSO4微乳液,并绘制了其四相伪三元相图．通过对比实验选择了乳化剂Triton X-100及油相环己烷,配制成了微乳液,并分别以硫酸亚铁溶液（以W表示）、环己烷（以O表示）、Triton X-100和正丁醇的复配乳化剂（以S＋C表示）为三相图的三个顶点绘制了伪三元相图．     

调速阀式旁路节流调速系统动态特性理论及试验研究

针对负载变化时旁路节流调速回路存在的液压缸输出前冲和液压缸进油腔压力冲击的问题,采用理论分析与试验研究相结合的方法,研究了调速阀式旁路节流调速系统参数变化对系统动态特性的影响.建立了旁路串接调速阀的节流调速系统动态特性的理论模型,并进行了相应的试验研究,试验数据分析结果与理论分析相吻合,为此类型回路系统设计提供了参考依据.     

基于OBDD的Iteration-free CPDL判定算法

命题动态逻辑是一种应用模态逻辑,用于程序行为的推理.Iteration-free CPDL是一种无迭代算子而含有逆算子的命题动态逻辑.对于给定的Iteration-free CPDL公式集,方法是应用NCNF变换和FLAT规则对其进行预处理,并对公式集重构模型,然后将其转化为布尔函数,并利用OBDD来表示,从而调用已有...     

面向方面的XML结构连接算法的改进

为了解决在多文档下插入节点或需要修改节点编码时查询效率比较低的问题,提出了一种有效的结构连接算法.在分析现有单文档下的XML结构连接算法基础上,对祖先/后裔与双亲/孩子结构查询进行改进,基于归并思想解决多文档下的结构连接,以适应在面向方面的XML Schema中定义的基于多文档的查询.改进后的结构连接算法可以进一步利用XML数据的特点、索引和织入文档信息减少连接扫描的代价,具有一定的合理性、有效性和实用性.