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遭遇高楼火灾如何自救

当代学生 2024年第7期 19-21页

作者： xy 不详

南京高层建筑15死44伤的火灾牵动了很多人的心。火灾逃生,尤其是高层建筑火灾逃生又一次成为人们关注的话题。高层建筑火灾为何易蔓延,杀伤力大?建筑高度大于27米的住宅建筑和大于24米的非单层厂房、仓库和其他民用建筑称为高层建筑。... 详细信息

南京高层建筑15死44伤的火灾牵动了很多人的心。火灾逃生,尤其是高层建筑火灾逃生又一次成为人们关注的话题。高层建筑火灾为何易蔓延,杀伤力大?建筑高度大于27米的住宅建筑和大于24米的非单层厂房、仓库和其他民用建筑称为高层建筑。根据使用性质和高度,建筑高度超过100米的建筑是超高层建筑。由于其特殊性,高层建筑一旦发生火灾很容易蔓延。

关键词：高层建筑单层厂房住宅建筑火灾逃生民用建筑高楼

Photoinduced Enhancement of Gas Response Behavior of Tetra(heptyloxy)phthalocyanine Thin Film

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Chinese Chemical Letters 1998年第2期9卷 207-209页

作者： Li, xy Xu, HJ Jiang, DP Lu, AD Chinese Acad Sci Inst Photog Chem Beijing 100101 Peoples R China Chinese Acad Sci Changchun Inst Phys Changchun 130021 Peoples R China

The response of a spin coated phthalocyanine film to 1ppm NO2 can be increased significantly by light. This may be ascribed to the irritation of phthalocyanine molecules. This irritation decreased the energy changes o... 详细信息

关键词： phthalocyanine gas sensing properties photoinduced enhancement

Active oxygen radical scavenging ability of water-soluble fullerenols

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Chinese Science Bulletin 1997年第9期42卷 748-752页

作者： Sun, DY Zhu, YS Liu, ZY Liu, GZ Guo, XH Zhan, RY Liu, xy State Key Laboratory of Applied Spectroscopy Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun China

THE bioactivity study of C60 and its relative derivatives is of considerable ***60 itself is a non-polar molecule and very difficult to dissolve in common polar solvents,its ap-plication in biochemistry field is greatly *** preparation of some water-solubleC60 derivatives will be *** found that a water-soluble C60 derivative,[HOCO-

关键词： C60 fullerenols active-oxygen-radical ESR spin trapping.

12-Deoxyphorbol Esters from Euphorbia Fischeriana

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Chinese Chemical Letters 1996年第10期7卷 917-918页

作者： Liu, WZ Wu, xy Yang, GJ Ma, QG Zhou, TX Tang, XC Qin, GW SUN YAT SEN UNIV MED SCI DEPT CHEM GUANGZHOU 510089 PEOPLES R CHINA CHINESE ACAD SCI SHANGHAI INST MAT MED SHANGHAI 200031 PEOPLES R CHINA Second Mil Med Univ SCH PHARM SHANGHAI 200433 PEOPLES R CHINA

Two compounds, 12-deoxyphorbol-13-hexadecanoate 1 and 12-deoxyphorbol-13-acetate 2 were isolated from the roots of Euphorbia fischeriana. Compoound 1 was elucidated as a new diterpenoid. Compound 2 was discovered for ... 详细信息

关键词： Deoxyphorbol Esters from Euphorbia Fischeriana

Electrochemical Behaviour of Cu underneath Thin Electrolyte Film in Atmosphere

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Journal of Materials Science & Technology 1998年第6期14卷 547-550页

作者： Zhang, xy Du, YL Chinese Acad Sci Inst Corros & Protect Met State Key Lab Corros & Protect Shenyang 110015 Peoples R China

An electrochemical cell was devised to investigate corrosion electrochemical behavior of metal underneath thin electrolyte film in atmosphere. The Piontelli's type of Luggin-Haber capillary was inserted from the backward of working electrode. The results show that. cathodic process on Cu is mainly affected by the thickness of the electrolyte film of 0.5 mol/L HCl+1 mol/LNa2SO4 aqueous solution and its anodic dissolution changed from Tafel region to limiting diffusion current. Moreover, the corrosion potential of Cu in due media will increase with decrease of the thickness of the film.

关键词： Atmospheric corrosion

Comparative studies on the concerted and two-step mechanism of ketene-methylenimine cycloaddition

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Chinese Journal of Chemistry 1996年第2期14卷 97-104页

作者： Fang, DC Fu, xy BEIJING NORMAL UNIV DEPT CHEMBEIJING 100875PEOPLES R CHINA

The concerted reaction mechansim of the ketene-methylenimine cycloaddition reaction was reconfirmed by IRC calculation at HF/6-31G* level. Other possible reaction schemes were also studied. The cis and gauch intermediate cannot be found on the potential energy surface, and the trans intermediate can only lead to a 6-membered ring product. Therefore, a two step mechanism to form p-lactam is excluded for the title reaction.

关键词： ketene methylenimine cycloaddition mechanism

FINITE ELEMENT ANALYSIS OF A LOCAL EXPONENTIALLYFITTED SCHEME FOR TIME-DEPENDENTCONVECTION-DIFFUSION PROBLEMS

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Journal of Computational Mathematics 1999年第3期17卷 225-232页

作者： Yue, xy Jiang, LS Shih, TM Suzhou Univ Dept Math Suzhou 215006 Peoples R China Tongji Univ Inst Math Shanghai 200092 Peoples R China Hong Kong Polytech Univ Dept Appl Math Hong Kong Hong Kong

In [16], Stynes and O' Riordan(91) introduced a local exponentially fitted finite element (FE) scheme for a singularly perturbed two-point boundary value problem without turning-point. An E-uniform h(1/2)-order accuracy was obtain for the epsilon-weighted energy norm. And this uniform order is known as an optimal one for global exponentially fitted FE schemes (see [6, 7, 12]). In present paper, this scheme is used to a parabolic singularly perturbed problem. After some subtle analysis, a uniformly in epsilon convergent order h\ln h\(1/2) + tau is achieved (h is the space step and tau is the time step), which sharpens the results in present literature. Furthermore, it implies that the accuracy order in [16] is actuallay h\ln h\(1/2) rather than h(1/2).

关键词： singularly perturbed exponentially fitted uniformly in epsilon convergent Petrov-Galerkin finite element method

Syntheses of New Crowned Indolinospirobenzopyrans

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Chinese Chemical Letters 1997年第4期8卷 285-288页

作者： Wu, xy Wu, CT WUHAN UNIV DEPT CHEMWUHAN 430072PEOPLES R CHINA

Two new indolinospirobenzopyrans bearing monoaza-benzo-15-C-5 were synthesized. And they were determined by IR, H-1 NMR and MS.

关键词： RECOGNITION INDUCED ISOMERIZATION SPIROBENZOPYRANS

p-Hydrazinobenzenesulfonic Acid Derivatives of Carbohydrates andTheir Capillary Zone Electrophoresis

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Chinese Chemical Letters 2000年第12期11卷 1081-1084页

作者： Wang, xy Chen, Y Chinese Acad Sci Inst Chem Ctr Mol Sci Beijing 100080 Peoples R China

p-Hydrazinobenzenesulfonic acid is explored as a novel ultraviolet labeling reagent for capillary electrophoresis (CE) of mono- and disaccharides. The labeling reaction takes less than 10 minutes and introduces both o... 详细信息

关键词： p-hydrazinobenzenesulfonic acid carbohydrate derivatization capillary zone electrophoresis