数显全息照相两用仪

介绍一种既能测量辐照度比值又能实现曝光自动控制的数显两用仪。该仪器使用方便,显示清晰,对提高工作效率,节省材料,拍摄优良全息图有很好作用。     

Ultra-low frequency passive vertical vibration isolation system

An ultra-low frequency passive vertical vibration isolator is constructed by mounting a couple of additional masses on the crank-arms of the torsion spring. The theoretical analysis and experimental results show that the system with additional masses can achieve better vertical vibration isolation and longer resonant period. Measured displacement response of the test mass under seismic excitation reaches 3 x 10^{-12 m/√ Hz} around 10 Hz, and the isolation ratio comes to about 60 dB attenuation at 6 Hz, which is about 30 dB lower than that of the system without additional masses.     

相移掩膜应用于显示技术光刻细线化的初步研究

对基于不改造应用于显示技术的曝光设备而提高光刻解像力进行研究。用半导体工艺模拟及器件模拟软件模拟分析了离焦量为0时,两种相位移掩膜和传统掩膜下4μm/2μm等间隔线的光强分布。并根据设备参数模拟分析离焦量为15、30μm时通过掩膜得到的光刻间距情况,最后实际比较测量了两种相位移掩膜在相同条件下各自曝光剂量范围和切面微观图。实验结果表明:自准直式边缘相移掩膜相比无铬相移掩膜在产能和良率方面更有优势。自准直式边缘相移掩膜更适合显示技术光刻细线化量产使用。     

YBa2Cu3O6.92超导体光电导效应的正电子实验研究

报道了对光辐照ＹＢａ２Ｃｕ３Ｏ６．９２材料的正电子寿命谱研究结果，给出了正电子寿命参数随辐照时间变化的基本特征，利用两态捕获模型对实验结果进行了初步分析，计算了局域电子密度ｎｅ和空位浓度Ｃｖ随辐照时间的变化，发现光诱导而产生Ｃｕ－Ｏ链区域电子结构的变化，证明Ｏ（１）和Ｏ（５）位之间的氧迁移和重新分布使得氧有序乃是光诱导电性的主要原因，为ＹＢａ２Ｃｕ３Ｏ６．９３体系光电导机理的理解提供了重要的正电子     

铀(Ⅵ)、钍(Ⅳ)与邻香草醛缩联苯胺配合物的合成和性质

合成了硝酸铀酰、硝酸钍与双希夫碱邻香草醛缩联苯胺（以Ｌ表示）的两种新固体配合物。通过元素分析、差热－热重、红外光谱、紫外光谱、摩尔电导分析等手段，确定两配合物的组成分别为［ＵＯ２Ｌ（ＮＯ３）］ＮＯ３、［ＴｈＬ（ＮＯ３）２］（ＮＯ３）２。并对它们的配位方式及某些性质进行了研究。     

一种新的D-π-A型异佛尔酮衍生物的合成及性质

通过Knoevenagel反应,合成了具有D-π-A结构的异佛尔酮衍生物（2-(3-(4-(双(2-(2-硝基苯氧基)乙基)氨基)苯乙烯基)-5,5-二甲基环-2-烯-1-亚基)丙二腈）,产率为80.7%,用红外光谱、核磁共振氢谱对化合物进行了表征。 初步研究了该化合物的光学和电化学性质及热稳定性,结果表明,该化合物有较好的光学性质和热稳定性。为寻找新的发光材料进行了有益的探索。     

乙炔和乙烯分子在Ge(001)表面吸附的第一性原理研究

采用基于密度泛函理论的第一性原理方法和平板模型研究了乙炔和乙烯分子在Ge(001)表面的吸附构型和电子结构. 通过系统考察一系列可能存在的吸附方式, 结果表明, 在0.5 monolayer(ML)覆盖度时, 两种分子的di-σ吸附构型最为稳定; 在覆盖度为1.0 ML时的最稳定吸附方式是paired end-bridge构型. 能带结构分析结果可知, 吸附构型以及吸附分子的覆盖度均对Ge(001)表面带隙有较大影响, 其原因在于费米能级附近的能带主要来自表面二聚体的Ge原子, 它们与表面Ge原子的配位环境密切相关, 而后者又取决于分子的吸附方式和覆盖度. 对于相同的吸附方式, 乙烯和乙炔分子具有类似的吸附行为和电子结构. 此外, 还进一步与Si(001)表面的研究结果进行对比.     

基于脱硫反应的硫脲基罗丹明B 汞离子荧光化学剂量计的合成及分子氢键的影响

基于汞离子促进硫羰基脱硫的不可逆反应, 合成了两种分别含有丙烯酰基酰肼基硫脲基团和丙烯基酰肼基硫脲基团的罗丹明B 荧光探针(RhBHA 和RhBCH), 用以高选择性、高灵敏度检测水溶液中的Hg²⁺离子. 通过荧光发射光谱和可见光下颜色变化研究了硫羰基所处的化学环境对汞离子促进的脱硫反应的影响. 研究结果表明, 引入罗丹明B荧光生色团后, 分子的“开环-闭环”转换过程与分子内氢键作用没有相互影响, 分子内氢键加速了汞离子的脱硫反应,伴随“开环-闭环”转换过程的颜色变化通过肉眼即可观察到. 此外, 还研究了分子间氢键作用对脱硫反应速率的影响.通过加入汞离子后荧光强度随时间变化的跟踪发现, 若溶剂与RhBHA 形成分子间氢键作用, 会使汞离子诱导的脱硫反应有所迟缓. 这种分子间的氢键作用, 对能促进快速脱硫反应的分子内氢键作用产生影响.     

Neutral and Anionic Monomeric Zirconium Imides Prepared via Selective C=N Bond Cleavage of a Multidentate and Sterically Demanding β‐Diketiminato Ligand

A sterically encumbering multidentate β‐diketiminato ligand, ^tBuL2 (^tBuL2=[ArNC(tBu)CHC(tBu)NCH₂CH₂N(Me)CH₂CH₂NMe₂]^?, Ar=2,6‐iPr₂C₆H₃), is reported in this study along with its coordination chemistry to zirconium(IV). Using the lithio salt of this ligand, Li(^tBuL2) ( 4 ), the zirconium(IV) precursor (^tBuL2)ZrCl₃ ( 6 ) could be readily prepared in 85 % yield and structurally characterized. Reduction of 6 with 2 equiv of KC₈ resulted in formation of the terminal and mononuclear zirconium imide‐chloride [C(tBu)CHC(tBu)NCH₂CH₂N(Me)CH₂CH₂NMe₂]Zr(=NAr)(Cl) ( 7 ) as the result of reductive C=N cleavage of the imino fragment in the multidentate ligand ^tBuL2 by an elusive Zr^II species (^tBuL2)ZrCl ( A ). The azabutadienyl ligand in 7 can be further reduced by 2 e^? with KC₈ to afford the anionic imide [K(THF)₂]{[CH(tBu)CHC(tBu)NCH₂CH₂N(Me)CH₂CH₂N(Me)CH₂]Zr=NAr} ( 8‐2THF ) in 42 % isolated yield. Complex 8‐2THF results from the oxidative addition of an amine C?H bond followed by migration to the vinylic group of the formal [C(tBu)CHC(tBu)NCH₂CH₂N(Me)CH₂CH₂NMe₂]^? ligand in 7 . All halides in 6 can be replaced with azides to afford (^tBuL2)Zr(N₃)₃ ( 9 ) which was structurally characterized, and reduction with two equiv of KC₈ also results in C=N bond cleavage of ^tBuL2 to form [C(tBu)CHC(tBu)NCH₂CH₂N(Me)CH₂CH₂NMe₂]Zr(=NAr)(N₃) ( 10 ), instead of the expected azide disproportionation to N^3? and N₂. Solid‐state single crystal structural studies confirm the formation of mononuclear and terminal zirconium imido groups in 7 , 8‐Et₂O , and 10 with Zr=NAr distances being 1.8776(10), 1.9505(15), and 1.881(3) Å, respectively.     

FINITE DIFFERENCE METHOD FOR ELECTROMAGNETIC SCATTERING FROM PERFECTLY CONDUCTING CYLINDER

A numerical method of solving electromagnetic wave scattering problem is described.Radiation boundary condition(RBC)is applied to confine EM scattering problem in unboundedregion into problem in finite region.Combined with RBC and scatterer surface boundary condi-tion,Helmholtz equation in the finite region is solved numerically by the finite difference method.Thus the distribution of induced surface current on conducting cylinder and near field can beobtained.Computational results for both polarizations for circular,elliptic and square cylindersare presented.These results are in excellent agreement with those obtained by the eigenfunctionexpansion method or moment method and much better then the results of OSRC method.