非水体系中磷酸镓大单晶合成与结构

非水体系中制备了GaPO4单晶,用X射线测定晶体结构的方法对化合物进行了表征.晶胞参数α=0.490 8lnm,b=0490 8lnm,c=1.1.106nm,α=90°,β＝90°,γ=120°.结构中的镓和磷均与氧形成四面体配位,骨架中的氧为二桥氧.无Ga-P连接方式,质子化的乙二胺阳离子未在孔道中.     

O,O′-二正丁基二硫代磷酸锌碱式双盐的晶体结构

用 X—光单晶衍射方法测定了一个由氧桥连结的二正丁基二硫代磷酸锌碱式双盐的晶体结构.晶体属三斜晶系,空间群为 Ci—(?);晶胞参数:a=12.522(2)°A,b=14.514(2)°A,c=14.528(2)(?).α=112.13(1)°,β=106.72(1)°,Υ=106.65(1)°.本文用直接法和付里叶综合法解出结构.最终的一致性因子 R=0.086.结构分析表明,分子中存在一个由处于对称中心的氧和与其四配位的锌所构成的骨架,金属锌呈空缺无序状态.     

In(CH3COCHCOCH3)3晶体合成及结构表征

标题化合物In(CH3COCHCOCH3)3晶体属单斜晶系,空间群P2(1)/n,晶胞参数:a=8.2042(16),b=13.281(3),c=16.380(3)A°,α=90°,β=90.91(3)°,γ=90°,Dc=1.534g/cm3,Mr=412.14,V=1784.6(6)A°3,Z=4,μ(M0Kα)=0.71073A°,F(000)=832,T=293(2)K,R=0.0412,Rw=0.1302.分子几何构形扭曲八面体.     

[Co(amp)2Cl2]2[ZnCl4]体系中一异构体的晶体结构

用单晶X-射线衍射分析方法解析了[Co(amp)2Cl2]2[ZnCl4](amp=2-胺甲基吡啶)体系中一异构体.该晶体属正交晶系,空间群Pccn,a=13.138(5)(A),b=13.410(6)(A),c=10.954(5)(A),α=90°,β=90°,γ=90°,V=1929.8(14)(A)3,Dc=1.647g/cm3,Z=4,F000=968,R=0.046,Rw=0.1194.     

三苄基锡吗啉二硫代氨基甲酸酯和二苄基锡双吗啉二硫代氨基甲酸酯的晶体结构

利用三苄基氯化锡,二苄基二氯化锡和吗啉二硫代氨基甲酸酯钠反应,合成了三苄基锡吗啉二硫代氨基甲酸酯（1）和二苄基锡双吗啉二硫代氨基甲酸酯（2）;通过元素分析、红外光谱、核磁共振氢谱和质谱对其结构进行了表征.用X-射线单晶衍射测定了这两个化合物的晶体结构.化合物1为三斜晶系,空间群P1,a=0.984 17（16nm）,b=1.08 163（19）nm,c=72.850（3）°,β=88.895（3）°,γ=64.231（3）°,Z=2,V=1.2528（4）nm3,Dx=1.469 g/cm3,μ=1.204 mm-1,F（000）=564,R=0.0328,wR=0.0995.化合物2为正交晶系,空间群Pca21,a=1.832 7（3）nm,b=0.656 78（12 nm）,c=2.258 3（4）nm,α=90°,β=90°,γ=90°,Z=4,V=2.718（9）nm3,Dx=1.258 g/cm3,μ=1.271 mm-1,F（000）=1272,R=0.043 4,wR=0.115 2.在1的晶体中,锡原子呈现五配位畸变三角双锥构型;2的晶体则是六配位的畸变八面体构型.     

微机CAD系列支撑支件及丛书(12)——圆软齿轮传动优化设计及CAD

本软件能够对直齿圆锥齿轮、弧齿圆锥齿轮、零度圆锥齿轮和圆弧齿双曲面齿轮进行优化设计及CAD.该软件的功能和特色如下:(1)直齿锥齿轮传动:适用于不同压力角(如α=14.5°,20°,22.5°,25°)在任意轴交角时的几何尺寸计算,接触和弯曲强度设计.(2)弧线齿和零度锥齿轮传动:适用于各种不同压力角(对弧线齿为14.5°,16°,20°,22°,25°;对零度锥齿为20°,22.5°,25°)不同螺旋角,轴交角为90°的格里森制等顶隙收缩齿的几何尺寸计算,确定刀具参数和设计.(3)弧齿双曲面齿轮传动:适用于轴交角为90°的格利森制等弧齿双曲面齿轮,齿数范围为z1=5～20,z2=30～60,平均压力角为19°,21.25°,     

[Co(amp)_2Cl_2]_2[ZnCl_4]体系中一异构体的晶体结构

用单晶X-射线衍射分析方法解析了[Co(amp)2Cl2 ]2 [ZnCl4 ] (amp=2-胺甲基吡啶)体系中一异构体。该晶体属正交晶系,空间群Pccn,a=13 138(5) ,b=13 410(6) ,c=10 954(5) ,α=90°,β=90°,γ=90°,V=1929 8(14) 3,Dc=1 647g/cm3,Z=4,F000 =968,R=0 046,Rw=0 1194。     

一种新奇的Ru(Ⅱ)配合物[Ru(bpy)3](dca)I0.5(OH)0.5·3H2O的合成与晶体结构

合成了一种新奇的Ru(Ⅱ)配合物[Ru(bpy)3](dca)I 05(OH)0.5·3H2O并进行了结构表征.该化合物属于六方晶系,P6/mcc晶胞群.晶格参数为a=1.3505(3)nm,b=1.3505(3)nm,c=2.1263(6)nm,α=90°,β=90°,γ=120°.在该化合物中,配体bpy和OH-离子之间以及dca和结晶水之间都存在较强的氢键作用.     

二水·二(水杨醛)合钴(Ⅱ)的合成及晶体结构分析

报道了标题化学物的合成及晶体结构 .经 X射线单晶结构分析结果表明 ,该配合物晶体属三斜晶系 ,空间群为 Pī,晶胞参数 :a=0 .5 2 2 9(4 ) ,b=0 .5 2 2 9(4 ) ,c=1.30 34(11) nm,α=90 .0 0 0 (13)°,β=90 .0 0 0 (13)°,γ=90 .0 0 0(11)°,z=1.每个重复的结构单元是由一个 Co( )原子是六配位的八面体结构     

脉冲可调谐钛宝石激光向短波长扩展的研究

对利用和频技术将脉冲钛宝石激光向短波长方向扩展的可能性进行了研究 .在仔细分析了脉冲钛宝石激光器结构的基础上 ,确定了用 KTP晶体实现钛宝石激光与倍频后剩余的 Nd∶ YAG激光和频的方案 .实验中选用两块 KTP作为和频晶体 ,切割角度分别为 θ=85°,φ=90°和 θ=76°,φ=90°,采用 (A)类相位匹配方式 ,获得了 45 9.3～ 5 0 9.6 nm的和频光 ,最大转换效率为 15 .2 % ,最大输出能量为 14.6 m J(在 46 3nm处 )     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that