Van del Pol振子方程本征值的移动1／N展开计算

应用移动１／Ｎ展开方法，计算Ｖａｎ ｄｅｌ ｐｏｌ振子方程的本征值。对ｖ＝０，且应用ＳＵＳＹ－ＱＭ计算其本征值。当光泵参数ｇ远低于阈值或在阈值附近，所有本征值都能和数值计算结果相吻合。当ｇ远高于阈值时，基态和第一激发态本征值亦能和数值计算结果相吻合。     

Endogenous oscillatory activity and TTX-sensitive spikes of the heart muscle in early juveniles of the isopod crustaceanLigia exotica

The heart beat of early juveniles of the littoral isopodLigia exotica occurred at a frequency of 250 to 350/min, associated with rhythmic activity of the heart muscle. Each burst was composed of a slow depolarizing potential with superimposed spike potentials. The spike potential was eliminated by perfusion with TTX-containing or Na⁺-free saline. In TTX-saline, the slow potential was unchanged in frequency and amplitude. By current injection into the heart muscle, the rhythm of the slow potential was phase-shifted and its frequency was changed in a membrane potential-dependent manner. These results show that the heart ofLigia early juveniles acts as an endogenous muscle oscillator generating oscillatory slow potentials and Na⁺-dependent spikes.     

双环己基多环体系液晶的合成与性质

以顺式结构的４－（４’－烷基－反－环己基）－环己烷羧酸构型转换、分离生成的反式异构体为原料，合成了两个系列双环己基四环体系液晶化合物。用ＩＲ、ＮＭＲ仪等确定了这些化合物的结构，用ＤＳＣ和偏光显微镜确定了这些化合物的相态和相转变温度，讨论了化合物结构与性质的关系。     

试论价键理论和晶体场理论的统一性

论述了价键理论和晶体场理论的统一性，并将两理论相结合，形成价键－晶体场理论，用于研究配合物的结构问题，取得了满意的结果。     

高压下MTi2（PO4）3晶体Raman光谱研究

利用Ｒａｍａｎ光谱研究了ＭＴｉ２（ＰＯ４）３（Ｍ＝Ｌｉ，Ｎａ，Ｋ）晶体在高压下产生的压致结构相变。实验结果表明：ＬｉＴｉ２（ＰＯ４）３和ＫＴｉ２（ＰＯ４）３在３ＧＰａ和６ＧＰａ压力附近发生了两次压致结构相变；ＮａＴｉ２（ＰＯ４）３在２．５ＧＰａ和７．５ＧＰａ压力附近发生了两次压致结构相变。     

一个基于1,10-邻菲咯啉端基配体的己二酸桥联双核铜配合物的合成与晶体结构

通过Cu(ClO4)2与己二酸(adipate)和邻菲咯啉(phen)在甲醇-水溶剂中反应得到了一个双核配合物[Cu2(phen)4(adipate)](ClO4)2.(H2O)1.33,并用元素分析、红外及X-单晶衍射技术进行了结构表征.标题化合物属于单斜晶系,C2/c空间群,晶胞参数为a=3.431 6(3)nm,b=1.380 05(12)nm,c=3.241 4(3)nm,β=94.679 0(10)o,V=15.299(2)nm3,Z=8.晶格中存在1.5个结晶学独立但结构参数非常类似的双核单元.每个中心Cu(Ⅱ)离子均处于五配位扭曲四方锥构型,配位原子分别来自于两个螯合的邻菲咯啉配体和一个己二酸根上的羧基氧原子.为了减小空间位阻效应,与中心Cu(Ⅱ)离子螯合配位的两个邻菲咯啉配体之间近似呈垂直排列.两个相邻Cu(Ⅱ)离子通过己二酸根离子连接形成双核结构,且相邻的双核单元之间存在较强的芳环堆积相互作用.     

三维超分子化合物[Zn(C13H14N2)(C8H4O4)]n·0.5nH2O的制备、晶体结构及性能研究

用锌盐、BPP(BPP为1,3-(4-吡啶基)丙烷)、H2ip(H2ip为间苯二酸)反应制得具有金刚石拓扑结构的配位聚合物[Zn(C13H14N2)(C8H4O4)]n.0.5nH2O.利用红外光谱、元素分析、X射线单晶衍射、荧光光谱及热重分析对其进行表征.标题化合物的晶体结构属于单斜晶系,空间群为P 2(1)/n,晶胞参数a=1.104 18(13)nm,b=1.119 24(14)nm,c=1.573 45(18)nm,α=90(°),β=104.150(5)(°),γ=90(°),M r=436.75,V=1.885 5(4)nm3,Z=4,D c=1.539 m g.m-3,F(000)=900,GOF=1.073,R1=0.038 1,ωR2=0.1002.     

Pr3+∶Y2SiO5晶体中橙—蓝频率上转换过程

测量了Pr³⁺∶Y₂SiO₅晶体的吸收谱, 标定了室温下Pr³⁺在Y₂SiO₅晶体4f²组态内的能级. 利用579 nm激光激发Pr³⁺∶Y₂SiO₅晶体, 观察到480~515 nm上转换荧光带. 运用时间分辨激光光谱技术测量了³P₀能级的上转换荧光衰减曲线. 通过研究上转换荧光的衰减曲线、 吸收谱、 激发谱和上转换荧光强度与泵浦激光单脉冲能量的关系, 确定了以¹D₂为中间态的能量转移上转换主要是上转换机制.      

Theoretical studies of C36 encapsulated in zigzag single-wall carbon nanotubes

Discovery of carbon nanotubes (CNTs) has attracted considerable attention in the scientific community due to their unique structures and properties. Chemical doping can further modify the electrical properties of CNT. The empty space inside CNT provides t…     

Crystal structure determining of 7-ADCA based on X-ray powder diffraction

Traditionally, crystal structure data can be collected and determined from single-crystal X-ray diffraction. However, in the fields of organic and macromolecular crystallography, it is often difficult or impractical to grow single crystals with suitable sizes and purity. Therefore, it will be benefited from the newly growing analytical tool that combining X-ray powder diffraction based on polycrystalline samples and ab initio calcula- tion[1]. 7-ADCA is one of the most important intermediate…