以3,5-二甲基-1H-1,2,4-三氮唑及对苯二甲酸根构筑的三维锌配位聚合物的合成、晶体结构及荧光性质(英文)

水热法合成了1个新颖的锌配位聚合物{[Zn3(Hdmtrz)2(1,4-bdc)3]·2H2O}n(1,Hdmtrz=3,5-二甲基-1-H-1,2,4-三氮唑,1,4-bdc=对苯二甲酸根),对其进行了红外光谱、元素分析、X射线粉末衍射和热重分析等表征,并用X-射线单晶衍射法测定了配合物的单晶结构。该配合物属三斜晶系,P1空间群,晶胞参数为a=0.917 97(18)nm,b=0.983 3(2)nm,c=1.071 7(2)nm,α=100.81(3)°,β=102.589(3)°,γ=106.90(3)°,V=0.8418(3)nm3,Z=1。该化合物为三维框架结构,拓扑类型为pcuα-Po简单立方格子,Schl覿fli符号记为{412·63}。室温固态荧光测试显示,配合物在471 nm(λmax)具有强的荧光吸收。     

高中数学课堂“小组合作讨论”中有效提问的策略研究

研究问题的起因:新课程的理念是以人为本,体现这一理念就要求学生更多地参与到教学活动中,小组合作学习的教学模式可使学生人人参与学习过程,人人得到锻炼的机会,培养学生集体合作的精神,它的有效运用成为体现新课程改革精神的重要标志之一.近两年在淳安县第二中学也实行了"高效合作小组"分组制,每个班根据各班的实际情况,每组六人左右,每组要有优等生、中等生和学困生且都有小组长,小组长的学习成绩     

液体中声吸收对光声信号波形的影响

研究液体中声吸收对三种具有不同波形的脉冲光声信号的影响，把吸声介质视为一个线性、时空不变的低通滤波器，得到了考虑声吸收后光声脉冲的幅值和波形随传播距离变化的表达式。     

铁路中间站车辆的溜逸及防溜对策与措施

中间站车辆溜逸在行车事故中占有很大比重,特别是滚动轴承车辆不断增加,车辆溜逸事故也随之上升。产生车辆溜逸的因素主要有人员素质、设备条件、管理方式、自然环境等。通过执行“四个结合”、“五个关键”和“三不动车”等措施,严格卡控作业关键,使调车作业中车辆溜逸事故得到控制。     

一个包含Smarandache函数及第二类伪Smarandache函数的方程

主要研究方程Z2（n）＋1=S（n）的可解性,利用初等方法以及Smarandache函数的性质,证明了该方程有无穷多个正整数解,并获得了所有正整数解的具体表现形式．     

一类完全非线性函数的原像分布

利用代数数论的有关知识与理论,研究了从3l阶交换群到3阶交换群上完全非线性函数的原像分布特征方程,通过讨论其等价方程x2+xy+Y2=l的整数解问题,给出了该类完全非线性函数存在的必要条件及其原像分布特征的计数.进一步给出了求该类完全非线性函数所有可能原像分布特征的一个算法.     

人机交互式档案管理软件系统让“无纸化”办公不再只是设想

目前,在系统档案管理领域中,管理软件多为C／S结构,能够对已形成档案的目录级文件进行简要的信息录入,对文书档案的归档、数据库管理有一定意义。但是,C／S结构的管理软件有很多弊端,如,它们一般无法形成网络化管理。以往管理软件由于设计结构上的局限,使得这些软件只能是单机版软件,即只能安装于某一台具体的计算机,无法实现联网。     

无锡市高职院校体育教师信息素养状况的调查与分析

采用问卷调查法、访谈法等研究方法,对无锡市高职院校体育教师信息素养的现状进行了调查分析,指出当前体育教师信息素养方面存在的问题,并针对无锡市高职院校的情况,提出了培养体育教师信息素养的建设性对策。     

Calculation of infrared properties of low emissivity coatings containing metallic flake pigments

The infrared emissivity of low emissivity coating can be significantly reduced by adding high content concentrations of parallel distributed metallic flake pigment. However, the infrared emissivity is very difficult to calculate by the existing theory models, such as the light scattering theory and traditional Kubelka-Munk radiative transfer model, because of shape and distribution anisotropy of flake pigments. Thus, the low emissivity coating is assumed to be the superposition structure of homogeneous layers and metallic flakes are approximately uniform and parallel arrangement in each layer. Based on geometric optics theory and Kubelka＇s layer model, considering multiple reflection, transmission and absorption of infrared radiation among different layers, the theoretical model is established to calculate the coating emissivity. The facts of binder, pigment concentration and thickness are also systematic discussed. The result shows that the law of influence on infrared emissivity can be correctly simulated by this theoretical model. Transparent binder, high volume concentration of thin flake pigment can facilitate to reduce infrared emissivity. Moreover, this model offers the possibility of predicting the infrared optical properties of coatings by their optical constants.     

Mssbauer studies on the shape effect of Fe_(84.94)Si_(9.68)Al_(5.38) particles on their microwave permeability

Ball milling for long time (such as 10, 20, and 30 h) can transform Fe 84.94 Si 9.68 Al 5.38 alloy powders with irregular shapes into flakes. X-ray diffraction (XRD) and Mssbauer measurements have proven that the unmilled particles and the flakes obtained by milling for 10 h have the same D0 3 -type superlattice structure. The flakes obtained by milling for 20 h and 30 h have the same disorder α-Fe(Si, Al) structure. There are more than 6 absorption peaks in the transmission Mssbauer spectra (TMSs) for the particles with D0 3 -type superlattice structure, which can be fitted with 5 sextets representing 5 different Fe-site environments. However, only 6 TMS absorption peaks have been found for particles with a disorder α-Fe(Si, Al) structure, which can be fitted with the distributions of Mssbauer parameters (Bhf, isomer shift). The TMS results show that the flaky particles have a stronger tendency to possess the planar magnetic anisotropy. As the result, the flakes have larger microwave permeability values than particles with irregular shapes. The conversion electron Mssbauer spectra (CEMSs) also show the significantly different Fe-sites environments between the alloy surface and the inside.