2-硝基-4-氯-2'-羟基-3'-特丁基- 5'-甲基偶氮苯的固相合成

2-硝基-4-氯-2'-羟基-3'-特丁基- 5'-甲基偶氮苯的固相合成;硝基氯羟基特丁基甲基偶氮苯;固相合成;重氮偶合     

Crystal Structure and Properties of [PrCl(H_2O)_3(L)(HL)]_nnCl(HL=3-Hydroxy-2-methylquinoline-4-carboxylic acid) with One-dimensional Chains

A novel praseodymium complex [PrCl(H_2O)_3(L)(HL)]_nnCl(1, HL = 3-hydroxy-2-methylquinoline-4-carboxylic acid) has been synthesized through hydrothermal reactions and characterized by single-crystal X-ray diffraction. Complex 1 crystallizes in P2_1 space group of the monoclinic system, with a = 7.3146(2), b = 9.3963(3), c = 17.4872(5) ?, β = 96.818(3)°, V = 1193.40(6) ?~3, C_(22)H_(23)Cl_2N_2O_9Pr, M_r = 671.23, Z = 2, D_c = 1.868 g/cm~3, μ(MoKα) = 2.322 mm~(-1) and F(000) = 668. The praseodymium ion is surrounded by seven oxygen atoms and one chlorine atom to yield a slightly distorted square antiprism. Complex 1 is characterized by a one-dimensional chain-like structure. A two-dimensional supramolecular layer is formed via hydrogen-bonding interactions. Solid-state photoluminescence spectrum reveals that it shows red emission. The emission bands are ascribed to the characteristic emission of the 4 f electron transitions of ~3P_0 → ~3H_J(J = 5 and 6) and ~3P_0 → ~3F_4 of Pr~(3+) ions. Solid-state UV/Vis diffuse reflectance spectroscopy exhibits that it has an optical band gap of 2.75 eV.     

公共图书馆免费开放与读者服务——以广州少年儿童图书馆为例

公共图书馆免费开放的全面推行,是我国图书馆事业发展的又一个里程碑。以广州少年儿童图书馆为例,阐述了公共图书馆免费开放后存在的问题,提出了解决这些问题的思路。     

太阳能级硅片化学清洗技术进展

介绍了硅片表面污染物的种类、来源及形成机理,论述了太阳能级硅片传统的RCA清洗技术中各种清洗液的清洗原理和优缺点,同时对改进的RCA清洗、HF/O3和电化学清洗等新型湿化学清洗技术进行了阐述,指出了太阳能级硅片化学清洗技术的发展方向。     

子君的出走:又一爱情神话--鲁迅小说《伤逝》再解读

"接受屏幕"和"期待视野"是比较文学中接受美学的两个关键点.以此为理论依据,同时在易卜生的<玩偶之家>与鲁迅的<伤逝>各自的写作背景和寓意的基础上,对<玩偶之家>之于<伤逝>之重大影响以及<伤逝>之于<玩偶之家>之个人取向进行探讨,从而表明,文化接受事实上是一种文化过滤.     

浅析《毛诗序》中两段选文的英译

美国著名汉学家宇文所安从其独特的视角以一种翻译与评论相结合并立足文本细读的方法解读中国古代文论,由于根源于不同文化,也由于两种语言本身的非对等性,在翻译和注解的过程中不可避免地出现了一些误译和误释。选取他对《毛诗序》两段选文的翻译以及译文后面的评论,并对比《毛诗序》中的原文,就以上问题进行了细致的分析。当然,不可否认的是,他在向西方介绍中国传统文学理论方面起到了不可估量的作用。     

自动化化学实验系统的设计研究

开发设计了一个基于在LabVIEW平台构建虚拟仪器的化学自动实验系统.系统采用Lab-VIEW VISA库函数实现计算机与单片机之间的串行通信,控制化学自动实验装置,实现化学实验过程自动化,如精确的加液量、实验反应条件控制等.系统采用NI公司的USB-6009数据采集卡,实时采集实验相关数据,同时对实验数据进行相应的分析、处理、显示,使实验变得简捷、精确、省料、高效.     

光伏专业《大学化学》课程双语教学的探讨

大学化学是光伏专业的重要专业基础课程。大学化学在光伏专业进行双语教学时具有优势与必要性,通过教学资源的选挣与建设与教学方法的选择,可以开展具有光伏专业特色的大学化学双语教学。     

Electron states scattering off line edges on the surface of topological insulator

We study the local density of states （LDOS） for electrons scattering off the line edge of an atomic step defect on the surface of a three-dimensional （3D） topological insulator （TI） and the line edge of a finite 3D TI, where the front surface and side surface meet with different Fermi velocities, respectively. By using a S-function potential to model the edges, we find that the bound states existed along the step line edge significantly contribute to the LDOS near the edge, but do not modify the exponential behavior away from it. In addition, the power-law decaying behavior for LDOS oscillation away from the step is understood from the spin rotation for surface states scattering off the step defect with magnitude depending on the strength of the potential. Furthermore, the electron refraction and total reflection analogous to optics occurred at the line edge where two surfaces meet with different Fermi velocities, which leads to the LDOS decaying behavior in the greater Fermi velocity side similar to that for a step line edge. However, in the smaller velocity side the LDOS shows a different decaying behavior as x-1/2, and the wavevector of LDOS oscillation is no longer equal to the diameter of the constant energy contour of surface band, but is sensitively dependent on the ratio of the two Fermi velocities. These effects may be verified by STM measurement with high precision.     

高职高专旅游英语专业建设路径探索——以镇江高等专科学校为例

针对目前高职旅游英语专业课程设置、使用的教材、师资、教学模式等方面存在的问题,通过校企合作,工学结合,旅游英语专业的课程设置、师资、教材、教学模式以及评估方式等都将得到很大的改善,从而培养出符合社会需要的高技能应用型人才。