检索结果-南通市图书馆

Chinese Chemical Letters 2008年第9期19卷 1035-1038页

作者： Qing Han Li zhi gang zhao College of Chemistry and Environmental Protection Engineering Southwest University for Nationalities Chengdu 610041 China

Six new N4-[bi-（4-fluorophenyl）-methyl]-piperazine thiosemicarbazones 3a-f have been prepared starting from [bi-（4-fluorophenyl）-methyl]-piperazine in solvent-free condition under microwave irradiation with excell... 详细信息

关键词： bi-(4-Fluorophenyl)-methyl]-piperazine Thiosemicarbazones Microwave irradiation Solvent-free Organic synthese

Design and synthesis of novel chiral molecular tweezers based on deoxycholic acid

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第9期19卷 1051-1054页

作者： zhi gang zhao Xing Li Liu Yi Zhong College of Chemistry and Environmental Protection Engineering Southwest University for Nationalities Chengdu 610041 China

A novel type of chiral molecular tweezers has been designed and synthesized by using deoxycholic acid as backbone and ethanoyl and the chiral unsymmetrical urea unit as arms. Their structures were characterized by 1H NMR, IR, MS spectra and elemental analysis. These molecular tweezers showed good binding ability for neutral molecules and chiral molecules.

关键词： Molecular tweezer Deoxycholic acid Synthesis Molecular recognition

Synthesis of new hyodeoxycholic acid thiosemicarbazone derivatives under solvent-free conditions using microwave

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2011年第4期22卷 405-408页

作者： zhi Chuan Shi zhi gang zhao Xing Li Liu Yu Chen College of Chemistry and Environmental Protection Engineering Southwest University for NationalitiesChengdu 610041China

An efficient and simple method for synthesis of new hyodeoxycholic acid thiosemicarbazone derivatives under solvent-free conditions using microwave has been *** main advantages are short reaction times,good conversions and the environmentally friendly nature of the *** preliminary results indicate that some of these compounds possess inhibitory effects against ***.

关键词： Thiosemicarbazone Steroids Hyodeoxycholic acid Antimicrobial activity Microwave

A comparison study of existence forms of Fe species in coke for solution loss reaction of carbon

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2018年第7期25卷 692-699页

作者： Qiang Ling Hui-juan zhao Ling-yu Chen Rui-lun Xie zhao Lei zhi-gang zhao Anhui Key Laboratory of Coal Clean Conversion and Utilization School of Chemistry and Chemical Engineering Anhui University of Technology Ma'anshan 243002 Anhui China

Fe species were loaded by two different loading ways （absorption method and addition method） to investigate their effect on thermal properties of coke. The particulate coke reactivity of coke samples indicated that the added sample showed higher catalytic activity than the adsorbed sample at first, owing to the decreased structure and properties of coke and more catalytic active sites caused by the strong interaction between Fe species and coke. The presence of Fe species in the added sample weakened the microstructure of coke, and the Fe species were easier to be reduced than those in the absorbed sample due to its different existence form in coke. With further increased loading of Fe species, the different existence positions of Fe species caused more decrease in surface active sites in the added sample than in the adsorbed sample, leading to lower catalytic activity of added sample when the total iron content exceeded 1%. The catalytic mechanism implied that there may be a catalytic dominant factor change in the reaction between the catalytic effect of iron species and carbon surface active sites in coke; the catalytic effect of iron species is dominant in the reaction at first, but the catalytic effect of carbon surface active sites is dominant in the reaction with the further increased loading amount of Fe species.

关键词： Coke reactivity Catalytic mechanism Coke structure Fe species Existence form

Design and synthesis of novel tweezer anion receptors based on deoxycholic acid

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第3期18卷 287-290页

作者： Xing Li Liu zhi gang zhao Shu Hua Chen College of Chemistry and Environmental Protection Engineering Southwest University for Nationalities Chengdu 610041 China The Faculty of Chemistry Sichuan University Chengdu 610064 China

A novel type of molecular tweezer receptors based on deoxycholic acid has been designed and synthesized and their binding properties were examined by UV-vis spectral titration. These molecular tweezers showed a high s... 详细信息

关键词： Molecular tweezers Deoxycholic acid Anion Recognition

PREPARATION AND SECOND-ORDER OPTICAL NONLINEARITY OF NOVEL PHENOXYSILICON NETWORKS BY SOL-GEL PROCESS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2001年第1期19卷 39-44页

作者： Xiao Huang Jian Wang Ling-zhi Zhang zhi-gang Cai zhao-xi Lianga Institute of Polymer Science Zhongshan University Guangzhou 510275 China Institute of Polymer Science Zhongshan University Guangzhou 510275 China Institute of Polymer Science Zhongshan University Guangzhou 510275 China State Key Lab of Ultrafast Laser Spectroscopy Zhongshan University Guangzhou 510275 China Institute of Polymer Science Zhongshan University Guangzhou 510275 China

Four phenoxysilicon networks for nonlinear optical (NLO) applications were designed and prepared by an extended sol-gel process without additional H2O and catalyst. All poled polymer network films possess high second-order nonlinear optical coefficients (d(33)) Of 10(-7)similar to 10(-8) esu. The investigation of NLO temporal stability at room temperature and elevated temperature (120 degreesC) indicated that these films exhibit high d(33) stability because the orientation of the chromophores are locked in the phenoxysilicon organic/inorganic networks.

关键词： phenoxysilicon networks sol-gel process azobenzene chromophore stilbene chromophore second order optical nonlinearity

Rapid and efficient synthesis of new chiral aromatic amide molecular tweezers under solvent-free conditions using microwave

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2009年第4期20卷 397-400页

作者： Xiao Xiang zhao zhi gang zhao Xing Li Liu Xiu Ming Wu College of Chemistry and Environmental Protection Engineering Southwest University for Nationalities Chengdu 610041 China

An efficient and simple method for the synthesis of new chiral aromatic amide molecular tweezers by irradiation with microwave under solvent-free conditions has been developed. Its main advantages are short reaction t... 详细信息

关键词： Molecular tweezer Aromatic amide Microwave irradiation Molecular recognition

Microwave assisted one-pot synthesis of novel molecular clefts with only one chiral arm based on deoxycholic acid

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第1期19卷 33-36页

作者： BiTao Zeng zhi gang zhao Xing Li Liu Yun Shi College of Chemistry and Environmental Protection Engineering Southwest University for Nationalities Chengdu 610041 China

A rapid, safe, and efficient method for the synthesis of novel molecular clefts based on deoxycholic acid was reported. Seven new molecular clefts have been synthesized in good yields （89-98%）. This method proved to be extremely simple and highly efficient. The structures of these receptors were confirmed by 1H NMR, IR, MS spectra and elemental analysis. 2007 zhi gang zhao. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Molecular cleft Deoxycholic acid Microwave irradiation Recognition

Modification mechanism of caking and coking properties of Shenmu subbituminous coal by low-temperature rapid pyrolysis treatment

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2019年第10期26卷 1052-1060页

作者： Xiang-chun Liu Bin Fang zhi-gang zhao Rui-lun Xie zhao Lei Qiang Ling Ping Cui Anhui Key Laboratory of Coal Clean Conversion&Utilization School of Chemistry and Chemical EngineeringAnhui University of TechnologyMa'anshan 243032AnhuiChina

Shenmu(SM)subbituminous coal without caking property was treated by low-temperature rapid pyrolysis(LTRP)to modify its caking and coking *** treated samples were characterized by Fourier transform infrared spectrometry,vitrinite reflectance,and X-ray diffraction to determine the modification ***,caking index(G)and coking indices(mechanical strength,coke reactivity,and coke strength after reaction)were employed to evaluate caking and coking properties,*** results showed that SM coal was gradually upgraded with increasing processing ***,the G values for the treated samples were significantly higher than that for SM coal,and G reached the maximum value at 450℃,implying the modification of caking property and the existence of an optimum temperature(450℃).Additionally,laboratory coking determinations showed that LTRP increased the mechanical strength of coke and coke strength after reaction and decreased coke reactivity when the treated coals were used in the coal blends instead of raw SM ***,LTRP treatment is effective to improve the caking and coking properties of SM coal.A mechanism was proposed for the *** upgrading degree with suitable molecular masses and some releasable hydrogen-rich donor species present within the coal,which dominate the development of caking property,is important.

关键词： Caking property Coking property Non-caking coal Low-temperature rapid pyrolysis Subbituminous coal

Covariance of Floral and Vegetative Traits in Four Species of Ranunculaceae:A Comparison between Specialized and Generalized Pollination Systems

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2008年第9期50卷 1161-1170页

作者： Jin-Liu Meng Xian-Hui Zhou zhi-gang zhao Guo-Zhen Du Key Laboratory of Arid and Grassland Ecology of Ministry of Education at Lanzhou University Lanzhou 730000 China College of Life Sciences Wuhan University Wuhan 430072 China

Theory predicts that tighter correlation between floral traits and weaker relationship between floral and vegetative traits more likely occur in specialized flowers than generalized flowers, favoring by precise fit with pollinators. However, traits and trait correlations frequently vary under different environments. Through detecting spatiotemporal variation in phenotypic traits （floral organ size and vegetative size） and trait correlations in four Ranunculaceae species, we examined four predictions. Overall, our results supported these predictions to a certain degree. The mean coefficient of variation （CV） of floral traits in two specialized species （Delphinium kamaonense and Aconitum gymnandrum） was marginally significantly lower than that of another two generalized species （Trollius ranunculoides and Anemone obtusiloba）. The two specialized species also showed marginally significantly smaller CV in floral traits than vegetative size across the two species. The absolute mean correlation between floral and vegetative traits, or that between floral traits in species with specialized flowers was not significantly lower, or higher than that in generalized plants, weakly supporting the predictions. Furthermore, we documented a large variation in trait correlations of four species among different seasons and populations. Study of covariance of floral and vegetative traits will benefit from the contrast of results obtained from generalized and specialized pollination systems.

关键词： coefficient of variation floral traits generalized flower Ranunculaceae specialized flower trait correlation vegetative traits.