新桥联双亚胺化合物的合成及红外表征

本文以廉价的化工产品乙二胺和2，3-二甲氧基苯甲醛为起始原料，在溶剂无水甲醇中通过经典的醛胺缩合反应合成一种新的桥联双亚胺化合物，产率为89．0％，结构通过IR光谱表征。     

一元泛代数的双同余、双同态与双同构

在一元泛代数上引入了双同余关系,从而使双同态映射与双同构映射得到了沟通.     

双变频双电机控制系统功率平衡方法及如何实现各方面的研究

双电机在使用过程中会存在功率、输出力矩不平衡的情况,为保障机电系统的健康、高效的运行,保持双电机功率平衡和力矩平衡时关键。基于对双电机功率平衡状态进行定义,对双电机不平衡因素的分析,得出双电机功率平衡条件,并提出双电机功率平衡控制方案。     

双扭杆双横臂独立悬架结构件有限元分析与关联式结构优化

基于双扭杆双横臂独立悬架的实体建模之上建立其有限元模型,对各零部件之间的连接关系进行模拟,并对悬架结构件进行有限元受力分析,得到了引起车架纵梁产生开裂的原因．对双扭杆双横臂独立悬架进行了关联式结构优化,结果表明,对关联式结构优化后,克服了纵梁开裂的问题并在后续实车上得到了应用,对工程实践有一定的实用价值．     

双羟基螺吡喃的合成及其光致变色性能研究

以2-羟基-3-甲氧基苯甲醛为原料,在制得2,3-二羟基-5-硝基苯甲醛的基础上,将其同2,3,3-三甲基-N-羟乙基-3H吲哚溴化物反应,合成了双羟基螺吡喃化合物。研究了制得化合物的光致变色性能。结果发现,0.02g/L的双羟基螺吡喃乙醇溶液,最大吸收波长在559nm,随紫外光照时间延长,溶液的吸光度逐渐增加,光照时间超过480s后,变化不明显;撤去紫外灯后,在日光灯照射下,双羟基螺吡喃乙醇溶液颜色逐渐恢复,超过600s后溶液颜色几乎变回原色;不同pH条件下,双羟基螺吡喃乙醇溶液经365nm紫外光照射后,呈现出不同的颜色。     

几种载流子传输材料的合成条件研究

对有机光电导器件组合中用到的几种新的腙类空穴传输材料４－（二甲氨基）苯甲醛－二苯基腙,４－（二苯氨基）苯甲醛－二苯基腙,４,４’－苯亚氨基）双苯甲醛－双（二苯基腙）的合成进行了研究。     

新型二甲基硅双醛腙类化合物的合成与表征

由二(4′-甲酰肼基苯基)-二甲基硅烷与苯甲醛、4-乙氧基苯甲醛和4-己氧基苯甲醛为原料经缩合反应合成了一系列含有Si的双醛腙类化合物。通过红外、核磁和飞行时间质谱确定其结构;通过紫外、荧光、热重以及差示扫描量热对化合物的性能进行表征。测试结果表明其最大吸收波长在305~320nm之间,溶液中荧光发射波长处于378~423nm之间,固态时荧光发射波长处于387~441nm之间,荧光量子产率在0.38~0.44之间。在热稳定性方面,其热分解温度均大于300℃,熔点在210℃以上,且玻璃态转化温度在139~200℃之间,具有良好的热稳定性。     

电化学滴定分析的新方法——双点滴定法

本文综述了库仑双点滴定法、极谱双点滴定法及电位双点滴定法的原理及其实际应用。这些新方法不仅简便快速,而且有利于滴定分析的数字化和计算机化。     

双横臂双扭杆悬架中上下扭杆的刚度匹配和等强度设计

 通过对双横臂双扭杆悬架中上下扭杆的刚度匹配和等强度设计问题的研究,提出了扭杆的设计方法.分析了双横臂双扭杆悬架的导向机构模型简图,得到了导向机构的运动关系和进行悬架刚度计算的方程;以满足悬架载荷要求和悬架刚度要求为前提,分析了上下扭杆的刚度匹配条件;在上下扭杆在悬架运动时的强度始终相等的前提下,分析了上下扭杆的等强度条件.通过对扭杆直径和有效长度的实例计算,证明所提出的上下扭杆的刚度匹配和等强度设计的方法是可行的.     

山东胜利发电厂双进双出磨煤机的调试

双进双出钢球磨煤机是近些年投产机组中普遍使用的磨煤机,文中详细论述了山东胜利发电厂BBD 3854型双进双出钢球磨煤机的主要特点及运行情况,重点介绍该种磨煤机及料位测量系统调试过程、调试中出现的主要问题及处理.     

圆柱形金属橡胶结构的静态力学性能

对圆柱形金属橡胶结构做静态实验,运用最小二乘法对实验数据进行拟合,得到金属橡胶材料本构方程的各系数,将由实验得到的各系数代入本构方程式中,从而得到理论拟合迟滞回线,将理论拟合迟滞回线与试验迟滞数据进行对比,发现理论拟合迟滞回线与试验迟滞数据吻合较好,同时运用ANSYS有限元软件对金属橡胶结构进行有限元建模、定义边界条件及施加载荷,最后进行应力应变分析,得到应力应变分布图,发现分析结果与实验结果吻合。     

两种含强供电基的三苯胺均二苯乙烯衍生物的合成及光电性能研究

设计合成了两种新型含强供电基团的三苯胺均二苯乙烯类化合物,并通过IR、MS、NMR进行了结构表征,用紫外吸收光谱、荧光发射光谱、循环伏安法(CV)等手段研究了它们的光电性能,分析了它们的电化学行为,计算出其电离势(P1)分别为5.41和5.54eV,带隙(Eg)分别为2.72和2.74eV,结果表明强供电子基团的引入大大增强了荧光量子效率和空穴的注入传输能力.     

有缺陷和无缺陷量子点内应变分布的比较与分析

阐述了量子点内能级结构与应变的关系,用ANSYS7．1计算了有缺陷和无缺陷两种情况下：InAs／GaAs量子点的应变分布,通过对计算结果的比较,讨论了两种情况下不同的应变分布对量子点电子结构影响的不同结果,指出有缺陷时量子点各能级的改变量都与无缺陷时不同,无缺陷时应变的作用只是使能级平行移动;有缺陷时,缺陷将使量子点内能级结构复杂化,有缺陷时发光波长和发光光谱都比无缺陷时复杂。     

Growth and study of some gel grown group II single crystals of iodate

Single crystals of calcium iodate and barium iodate were grown by simple gel technique by single diffusion method. The optimum conditions were established by varying various parameters such as pH of gel solution, gel concentration, gel setting time, concentration of the reactants etc. Crystals having different morphologies and habits were obtained. Prismatic, dendritic crystals of barium iodate and prismatic, needle shaped, hopper crystals of calcium iodate were obtained. Some of them were transparent, some transluscent, and few others were opaque. Both the crystals were studied using XRD, FT-IR, and thermal analysis. The crystals were doped by iron impurity. The effect of doping was studied using IR spectroscopy and thermal analysis.     

Growth and study of mixed crystals of Ca-Cd iodate

Mixed crystals of calcium-cadmium iodate were grown by a simple gel technique using diffusion method. The optimum conditions were established by varying various parameters such as pH of gel solution, gel concentration, gel setting time, concentration of reactants etc. Crystals having different morphologies and habits were obtained. Prismatic, dendritic crystals of calcium-cadmium iodate and prismatic needle shaped, hopper crystals of mixed iodate were obtained. Some of them were transparent, some transluscent and a few others were opaque. The crystals were characterized using FT-IR, EDAX, XRD, TGA and DTA.     

Relationship between mechanical properties and crystal structure in cocrystals and salt of paracetamol

Abstract

Objectives were to study mechanical properties of various solid forms of paracetamol and relate to their crystal structures. Paracetamol form I (PRA), its cocrystals with oxalic acid (PRA-OXA) and 4,4-bipyridine (PRA-BPY) and hydrochloride salt (PRA-HCL) were selected. Cocrystals and salt were scaled-up using rational crystallization methods. The resulting materials were subjected to different solid-state characterizations. The powders were sieved and 90–360?µm sieve fraction was considered. These powders were examined by scanning electron microscopy (SEM) and densities were determined. Tablets were made at applied pressures of 35–180?MPa under controlled conditions and the tablet height, diameter and hardness were measured. Tensile strength and porosity of the tablets were estimated using well known models. Crystal structures of these systems were visualized and slip planes were identified. Cocrystal and salt of PRA were physically pure. Sieved powders had comparable morphologies and particle size. The apparent and theoretical densities of powders were similar, but no clear trends were observed. The tensile strengths of these compacts were increased with increasing pressure whereas tabletability decreased in the order oxalic acid?>?PRA-HCL?≈?PRA-OXA?>?BPY?>?PRA-BPY. Tablet tensile strength decreases exponentially with increasing porosity with the exception of PRY-BPY and BPY. Slip plane prediction based on attachment energies may not be independently considered. However, it was possible to explain the improved mechanical properties of powders based on the crystal structure. Cocrystallization and salt formation have introduced structural features that are responsible for improved tableting properties of PRA.     

应用在食品行业中的冷封胶薄膜

概述了冷封胶薄膜的结构种类、制备工艺以及优点,接着陈述了冷封薄膜在软包装中的应用以及局限性,指出了实际生产中遇到的问题并对问题进行分析,提出改进方法.最后探讨了冷封薄膜未来的发展方向.     

宽带钢力学性能试样机械加工的难点及解决办法

在制取力学性能试样的机械加工中常发现试样有不同程度的弯曲与扭转变形，严重影响试样加工精度和力学性能测试的准确性。对宽带试样变形的产生原因及其对试样机械加工质量的影响进行了分析，并提出了相应措施，取得了较好的效果，保证了加工质量，提高了加工速度。     

计算机直接制版技术的发展问题及动向

阐述和分析了CTP技术的发展情况及特点;探讨了目前CTP发展中存在的认识不高、缺乏政策导向、设备版材配套研发不够、机制问题引起的市场恶性竞争问题突出和数字化环境建设及技术人才培养不够4个方面问题,并提出了发展对策;指出并分析了CTP技术4个主要发展动向:紫激光、热敏CTP发展迅速;外鼓式制版机成为主流;光敏型CTP版材紫激光光聚合版将成为主流;热敏型CTP版材免处理版方兴未艾.     

表面微观形貌测量方法探讨

综述了各类表面微观形貌测量方法,分析了它们各自的原理和优缺点,针对各种方法列举出了典型的商品化仪器,提出了目前存在的关键问题,并对各种方法的未来研究发展方向进行了展望.