A general,enantioselective synthesis of 2-substituted thiomorpholines and thiomorpholine 1,1-dioxides

In the course of our drug discovery programs, we had need to access chiral, 2-substituted thiomorpholines and their oxidized congeners, thiomorpholine 1,1-dioxides. Here, we disclose a high-yielding, general protocol for the enantioselective synthesis of C2-functionalized thiomorpholines and thiomorpholine 1,1-dioxides.     

Polarization of Molecular ions in NaTCNQ and TTF. TCNQ Crtstals

Self-consistent electrostatic intersite potentials and atomic charges have been calculated. Lattice cohesion energy for NaTCNQ has been reproduced when polarization of TCNQ- anion in the lattice was taken into account.     

LCD灰阶响应时间自动测量系统开发

的：灰阶响应时间需要测试不同灰阶之间切换需要的时间,这样测试的数据量是非常大的。如：9级灰阶,需要的的测试数据量就是9*（9-1）=72个。仅仅靠手动测试已经很难完成该测试。需要自动化的测量方法才能完成。方法：对LCD的灰阶响应时间自动测量进行了研究,用综合测试仪（DMS）与FPGA系统结合的方案完成灰阶响应时间的自动测量,可以快速准确的测试灰阶响应时间。结果：采用这个方案可以在无需额外购买测试设备的情况下几分钟内测试一组灰阶响应时间,测试基准采用DMS设备,所以测试的准确率高。结论：该自动测试方案对于LCD灰阶响应时间的测量和研究具有很强的实用价值。     

非化学计量组成Ba1.03Ce0.5Zr0.4La0.1O3－α的化学稳定性和离子导电性

用高温固相反应法合成了非化学计量组成的Ba_1.03Ce_0.5Zr_0.4La_0.1O_{3－α质子导体. 粉末X射线衍射(XRD)结果表明, 该材料为单一钙钛矿型BaCeO3斜方晶结构, 在高温下、CO2或水蒸气气氛中具有较高的稳定性. 扫描电子显微镜(SEM)观察分析表明, 材料经1550 ℃烧结20 h非常致密. 在500～900 ℃温度范围内, 用交流阻抗谱技术测定了材料在湿润氢气和湿润空气气氛中的电导率; 用气体浓差电池方法测定了材料在湿润氢气、湿润空气气氛中和氢-空气燃料电池条件下的离子迁移数, 研究了材料的离子导电特性, 并与化学计量组成的BaCe0.5Zr0.4La0.1O3－α材料进行了比较. 结果表明, 在500～900 ℃温度范围内、湿润氢气气氛中, Ba1.03Ce0.5Zr0.4La0.1O3－α材料的质子迁移数为1, 是一个纯质子导体. 在湿润空气气氛中, 材料的氧离子迁移数为0.688～0.170, 质子迁移数为0.218～0.017, 是一个氧离子、质子和电子空穴的混合导体. 在氢-空气燃料电池条件下, 材料的离子(氧离子＋质子)迁移数为0.990～0.796, 是一个氧离子、质子和电子的混合导体. 与化学计量组成的BaCe0.5Zr0.4La0.1O3－α材料相比较, 在相同实验条件下非化学计量组成的Ba1.03Ce0.5Zr0.4La0.1O3－α材料具有较高的电导率和离子迁移数.}     

Dynamic analysis and system identification of an LCD glass-handling robot driven by a PMSM

In this paper, Hamilton’s principle is employed to derive Lagrange’s equations of an liquid crystal display (LCD) glass-handling robot driven by a permanent magnet synchronous motor (PMSM). The robot has three arms driven by two timing belts. The dynamic formulations can be expressed by one and four independent variables, which are named as the rigid and flexible models, respectively. In order to verify the dynamic formulation is correct, we reduce the flexible model to the rigid one under some assumptions. In this paper, we adopt the real-coded genetic algorithm (RGA) to identify all the parameters of the robot and PMSM simultaneously. It is found that the RGA can identify system parameters which are difficult to be measured in practical problems, for examples, the inductance, stator resistance, motor torque constant, damping coefficient of the motor and timing belts. In numerical simulations, vibrations due to flexibility of the timing belts are investigated for the angular displacements, speeds, accelerations of arms, and the horizontal and vertical displacements of the robot. The angular displacements of the robot arm and the translational positions of the robot end are obtained in the numerical simulations and experimental results. From their comparisons, it is demonstrated that identification results of the dynamic model with four independent variables present the better matching with experimental results of the system.     

Jahn－Teller变形后C60－的结构和电子光谱

用INDO系列方法对C₆₀^－进行几何构型优化,得到D_3d对称性的构型,表明C₆₀^－确实发生了Jahn-Teller畸变,导致单键变短,双键变长,形成10种键,6种不等同碳原子,并以此构型为基础,计算了C₆₀^－的电子光谱,与实验结果吻合;同时对光谱进行了理论指认;最后对C₆₀^－的3种构型：D_5d,D_3d,D_2h的几何构型、能量、光谱和反应特性进行了分析、比较和总结。     

5.4 Properties and applications of cellulose triacetate film

The CTA film can be characterized by e.g. its relatively high moisture regain, significantly low birefringence, and moderate mechanical strength. Having been commercialized more than fifty years ago, it has been widely used as photographic film, protective film for polarizing plate, and optical compensation film for liquid crystal display (LCD). The photographic film application exploits the optical isotropy and unique physical properties of the CTA film. In the application of the CTA film to protective film for polarizing plate, its low in-plane birefringence is of particular importance. In the optical compensation to enhance the viewing angle of LCD, the CTA film, because of its moderate retardation in thickness direction (Rth), serves as an element of compensator as well as a base film. Considering the growth of the LCD market, the demand for CTA film is believed to be further expanding.     

用于液晶电光特性计算的无奇异点2×2矩阵研究

Berreman的矩阵法是研究和计算液晶光学特性的通用方法.为了减少计算量,近年来许多学者致力于简化其方法以提高计算速度,本文根据各向异性介质中光传播的电磁场理论以及光学折反射定律,在保证其准确性的同时,推出了新的矩阵方法.这种2×2矩阵公式表示相当简单.理论研究结果表明,该方法减少了以往的计算量,快速简洁,结果准确.     

低温液晶显示器-加固理论与实践

该文对液晶显示器(LCD)低温加固的理论进行分析和研究。在此基础上,介绍一种新研制的机载低温液晶显示器。在显示器中设计了一套透明的加热、真空保温、抗眩光及电磁屏蔽装置,低温工作时,只需非常小的加热功率,就能使液晶显示器正常工作,同时可以利用该装置中的氧化铟锡(ITO)导电膜层满足显示器视窗对防眩光及电磁兼容(EMC)特性的要求。这种新型低温加固型LCD集多种特殊功能于一体,具有功耗低、亮度高、可靠性好、抗眩光、EMC性能好及结构便于组装等多项显著优点。