Chlorofullerenes featuring triple sequentially fused pentagons

通讯作者地址: Tan,YZ(通讯作者),Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 2. Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, Xiamen 361005, Peoples R China 电子邮件地址: [email protected], [email protected] triple sequentially fused pentagons (TSFP) motif is one of the basic subunits that could be used for constructing fullerenes, but it violates the isolated pentagon rule (IPR) and has not been found in carbon cages to date. The properties of TSFP-incorporating fullerenes are thus poorly explored both theoretically and experimentally. Reported herein are four chlorinated derivatives of three different fullerene cages, all with the TSFP motif. X-ray crystallographic analyses indicate that the molecular strain inherent to the pentagon adjacency of a TSFP is significantly relieved upon exohedral chlorination, leaving one of the four pentagon fusion sites unsaturated and rendering the present derivatives chiral. This unique reactivity, in stark contrast to that of previously reported non-IPR fullerenes containing double fused pentagons or triple directly fused pentagons, can be rationalized by density functional theory calculations, and are expected to stimulate further studies of these new members of the fullerene family, both theoretically and experimentally.NNSF of China 20525103,20531050,20721001,20423002 20673088 973 Program 2007CB81530

information coding system based on tabular layouts of article characteristics

信息编码是信息集成最为基础的部分.本文研究了基于事物特性表的编码系统.阐述了产品技术资源的分类体系和在此基础上编码的体系结构,按照产品、零部件的功能、解原理和结构等进行分类标识.通过事物特性表描述编码对象的属性特征.最后结合实例说明该编码系统的应用

(Analysis of high speed trains' interior structure noise

针对国内高速列车的简化结构模型,采用Virtual Lab Acoustics专业声学求解器,建立了车厢结构声场耦合分析模型,对车厢结构模态、室内空腔模态及室内声振耦合系统进行了模型化分析.理论分析结果表明:在21.24 Hz和35.53 Hz处,车身结构模态的振动频率和空腔模态的振动频率接近,产生共振;在同一水平面上场点声压呈现强弱交替分布,随着频率的增加,车厢内部同一平面上沿横向和纵向的干涉条纹增加;不同测点声压级差异明显,噪声空间分布不均;在20~38 Hz频段,声压级处于80 dB以上

高速列车室内结构噪声分析

针对国内高速列车的简化结构模型,采用Virtual Lab Acoustics专业声学求解器,建立了车厢结构声场耦合分析模型,对车厢结构模态、室内空腔模态及室内声振耦合系统进行了模型化分析.理论分析结果表明：在21.24Hz和35.53 Hz处,车身结构模态的振动频率和空腔模态的振动频率接近,产生共振;在同一水平面上场点声压呈现强弱交替分布,随着频率的增加,车厢内部同一平面上沿横向和纵向的干涉条纹增加;不同测点声压级差异明显,噪声空间分布不均;在20～38Hz频段,声压级处于80 dB以上

峨眉山大火成岩省大理苦橄岩中矿物与熔体相关关系,以及岩浆混合和结晶在岩石中记录

详细研究岩浆喷发前岩浆过程,对获得原生岩浆组成,揭示源区性质及岩石成因有重要意义。大理市附近出露有与峨眉山玄武岩有成因关系的苦橄岩岩石。根据全岩主量及微量地球化学特征,结合岩相学观察,表明大理苦橄岩全岩成分变化受控于橄榄石及单斜辉石斑晶不同程度堆晶作用,其中橄榄石与单斜辉石斑晶质量比为1:0.35。全岩中斑晶与寄主岩浆的比例介于36:64至46:54之间

“心理科学与文化建设”研讨会发言纪要

各位领导,各位专家,早上好!非常高兴在元旦刚过、春年即将来临之际,我们举办一次心理科学与文化建设的论坛(或者称研讨会),请来各位专家,就这样一个非常重要的议题各抒己见。同时,我们也希望通过这样一个研讨会,将来逐渐形成一个机制或者一个平台,以便使我国心