查询词典 vis

The Diels-Alder cycloadditions of [60] fullerene for preparation of optical limitingmaterials are discussed in chapter 3 and 6. Soluble cycloaddition derivatives of 〓aresynthesized by the reaction of 〓 with indene,1,1'-biindene andcyclopentadiene derivatives.〓Particular, the Diels-Alder cycloaddition of 〓 with1,1'-biindene under controlled conditions affords the stable monoadduct 〓〓of novel structure, which was confirmed by HPLC, FTIR, FD-MS,〓NMR,〓 NMR, HMQC and HMBC spectra, Its two bridgehead cage carbons resonate at70.91ppm, The 〓 NMR spectra showed 38 lines consistent with the 〓 symmetryassociated with [6,6] addition. The 〓 shows similar optical limitingproperties to that of 〓 in toluene for 8ns laser at wave length 532nm. Moreover, thehigh solubility of this adduct in polar solvents such as THF, acetone enables itsincorporation into sol-gel glass matrix. The thin films prepared via the sol-gel methodshow improved OL behaviour compared to those of 〓. The langmuir-Blodgett filmformation and uv-visible absorption of 〓 are also investigated. LBmonolayer of this compound is prepared on the air-water interface at 〓 mol/l. In chapter 4, three water-soluble derivatives of [60] fullerene: fullerol(1), theaddition product (2)of fullerol (1)with polyvinylpyrrolidone and fumaric acidderivative of 〓(3) are synthesized and characterized.

通过Diels-Alder环加成反应，用茚〓和1，1'-联茚〓及取代茂合成了一系列可溶性的〓环加成衍生物，发现可控制反应条件，使1，1'-联茚与〓反应，并高产率地得到具有新颖结构的单加成物，用HPLC、FTIR、FD-MS 及〓、HMQC、HMBC等多种波谱技术对其结构进行表征，测得它的两个〓杂化的桥头碳的化学位移为〓ppm，证明生成的衍生物为6∶6闭式环加成，〓NMR谱中共给出38个信号，表明〓联茚衍生物分子具有〓对称性；在波长532nm，脉冲宽度8ns的激光下，〓联茚衍生物的甲苯溶液的光限幅性能与〓的甲苯溶液相近，由于〓联茚单加成衍生物熱稳定性好，在四氢呋喃，丙酮等极性溶剂中溶解性好，能分别均匀地掺入溶胶-凝胶中，已发现它的溶胶(so1)光限幅性能优于纯〓的光限幅性能；使用Langmuir-Blodgett技术将〓联茚衍生物在空气和水的界面进行了LB单层膜和多层膜实验以及UV-Vis吸收谱研究，通过等温压缩曲线测试，证明浓度为〓〓时，〓联茚衍生物能够形成单层膜。

Results of XRD,SEM,and UV-Vis indicated that ZnS nanocrystals can grow in and fill in the void of opal template,and SiO2 microspheres of templates are dissolved so as to form some three dimensional ordered porous structure and to form the inverse opal ZnS photonic crystals. Compared with opal templates,ZnS-opal and inverse opal ZnS photonic crystals assembled with SiO2 spheres in the same diameter show good optical properties and exhibited photonic band gap. The photonic band gap position of inverse opal ZnS moves towards UV area compared with opal and ZnS-opal.

结果表明：溶剂热法多次充填可使ZnS纳米晶在模板密堆积形成的空隙中均匀成核；经过酸处理的ZnS-opal中SiO2微球溶解、坍塌，形成蜂窝状三维有序介孔和反opal结构ZnS基光子晶体；相同粒径SiO2微球组装的opal模板、ZnS-opal以及反opal结构ZnS光子晶体均表现出光子带隙特性，但反opal结构ZnS光子晶体带隙位置相比前两者发生了蓝移。

By means of X-ray diffraction, nitrogen adsorption, UV-Vis diffuse reflectance, a successful isomorphous substitution of titanium in the silica framework of SBA-15 samples with Si/Ti = 50, 25, 20 has been proved, the substitution of Ti for Si does not change the highly ordered two-dimensional hexagonal mesostructure of SBA-15. Titanium is totally tetrahedral and highly dispersed.

通过X射线衍射、N2气吸附脱附、紫外—可见漫反射等表征手段，证明在Si/Ti＝50，25，20时，钛原子成功地取代了SBA-15中的硅原子而没有改变SBA-15高度有序的介孔二维六角结构，其中钛全部以四配位状态存在，而且高度分散。

Co2+,Mn2+ and Pb2+ ions performed headgroup configurational changeof keto→zwitterion→enol form and coordination to Schiff base moiety in LB films ismore difficult and it is more easy that Ni2+ ion coordinate to SBC18 in LB film bypenetrating to LB films.

FTIR透射光谱和UV-vis电子吸收光谱进一步证实了π-A等温线的宏观结果，即两组分间的吸引主要来源于头基间的相互租用，为以后研究混合膜的性质和功能提供了一定的依据。2。

The mixed photocatalyst was prepared by sol-gel method using the kieselguhr as active additional substance and characterized by XRD and FTIR.Being a model reaction by ultraviolet radiation,the photocatalytic degradation of methylene blue was investigated with a mixed catalyst.

以硅藻土为固体活性添加物，采用sol-gel方法水解钛酸四丁酯制备溶胶与硅藻土混合合成混杂型光催化剂，样品分别用XRD和FTIR表征；以光催化亚甲基蓝溶液为反应体系，用Uv -vis光谱评价在紫外光照射下活性实验。

Among the sacraments alluded to is Baptism, to which Ignatius refers (Polyc., ii; Smyrn., viii), and of which Hermas speaks as the necessary way of entrance to the Church and to salvation (Vis., iii, 3, 5; Simil., ix, 16), the way from death to life (Simil., viii, 6), while the Didache deals with it liturgically.

其中圣礼所暗示的是洗礼，而伊格指（ polyc。，二； smyrn ，八），和其中hermas说话作为必备的方式入口处教会，并救赎

Lugana co mes in many co lors and it is a blend of 52% co tton and 48% Vis co se.

您是否知道Lugana被称为布兰妮面料？

The radiated samples of yeast mannan and their control were measured by FT-IR, Vis-UV and scanning electron microscope, then they were observed and analyzed, and compared with the above two data.

它们既是糖分子内、分子间形成氢键和糖苷键的结构基础部件，又是甘露聚糖糖基化其他生物大分子进而影响它们在生物信息流中作用的重要结构部件。

The contents of microelements and vitamins in peel,pulp and seed of seed melon were determined separately by flame atomic absorption,High performance liquid chromatographyand UV-Vis absorption spectroscopy.

采用火焰原子吸收法、高效液相色谱法和紫外可见吸收光谱法对籽瓜的瓜皮、瓜瓤和瓜籽分别进行了微量元素与维生素含量的测定分析。

The film was characterized by scanning electron microcopy, UV-Vis absorption spectrum and FTIR. Spectrum analyses indicated that some kind of interaction did take place between PANI and In_2O_3 nanoparticles.

光谱分析表明，PANI和In_2O_3在形成纳米复合材料时二者之间存在一定的相互作用；形貌分析发现，PANI/In_2O_3纳米复合材料呈典型的核-壳结构，薄膜表面呈网状多孔结构。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。