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| 1 | A numerical study on fire endurance of wood beams exposed to three-side fire显示文摘To investigate the fire endurance of wood beams exposed to three-side fire, we conducted bearing capacity tests of two wood beams and experiments of five wood beams exposed to three-side fire. The finite element software ANSYS was also used to predict the fire endurance of those beams with the indirect order coupling method. It was found that the fire endurance decreases as the load level increases, and the reduction ratio tends to decrease. In the case of a certain load level, the fire endurance is improved if the section size is increased or covered by the fire protection coating. The central deformation increases as the fire duration increases, and the ratio of increase tends to rise. On another note, an increase in the density of wood leads to a rise in the fire endurance of a given beam. From the finite element method (FEM) calculation results, the fire endurance decreases as the load level increases, and the reduction ratio tends to decrease. When the load level is greater than 0.5, the fire endurance is significantly reduced, and it does not change significantly when the load level changes. Lastly, for a load level magnitude below 0.5, the fire endurance and load level are proportional to one another. | Jin ZHANG 1, Qing-feng XU2, Yi-xiang XU3, Bin WANG1, Jing-xiang SHANG1 (1Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096, China) (2Shanghai Key Laboratory of New Technology Research on Engineering Structure, Shanghai Research Institute of Building Sciences, Shanghai 200032, China) (3Department of Civil Engineering, Strathclyde University, Glasgow G12 8QQ, UK) | 2012 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2012，13，7： | 5 |
| 2 | Synthesis of New Aza-crown Ethers Containing Pyridine Ring and their Liquid Membrane Transport of Alkali Cations显示文摘Five new aza-crown ethers have been prepared by the condensation of 2,6-bis[(2-formylphenyl)oxymethyl] pyridine with different diamino compounds in hot methanol, the bis-Schiff bases without isolation were reduced with NaBH4 to afford the corresponding aza-crown ethers. The liquid membrane transport of alkali cations using the five new macrocycles as the ion-carriers was also studied. | Bin ZHAO1*, Feng Qin WANG1, Min XIA2, Lai Jin TIAN1 1Department of Chemistry, Qufu Normal University, Qufu 273165 2Department of Chemistry, Linyi Teacher’s College, Linyi 276000 | 2001 | Chinese Chemical Letters2001，12，1： | 3 |
| 3 | Protective effect of glutamine pretreatment on ischemia-reperfusion injury of spinal cord in rabbits显示文摘Objective To investigate the effect of glutamine(Gln)on the content of reduced glutathione hormone(GSH)and aminoglutaminic acid(Glu)of spinal cord following ischemia-reperfusion injury.Methods Totally 40 healthy adult male rabbits were randomly divided into five groups:sham-operation group(S group),ischemia-reperfusion injury group(I/R group),low-dose glutamine group(L Gln group),median-dose glutamine group(M Gln group)and high-dose glutamine group(H Gln group).After glutamine preconditioning,the model of spinal cord ischemia-reperfusion injury was established according to Zivin's method.The general status of animals was observed and the changes of Jacobs scoring were recorded in each group.Malondialdehydes(MDA),GSH,Glu and superoxide dismutase(SOD)activity in lumbar spinal cord tissues were determined using chemical colorimetry.The neuron number and deviation rate in spinal cord anterior horn were observed histopathologically.Results There was no significant difference between L Gln group and I/R group in behavior scoring,SOD activity,content of MDA and Glu,neuron number and deviation rate of spinal cord(P>0.05);however,there was a significant difference in GSH content of spinal cord(P<0.05).M Gln group and I/R group differed significantly(P<0.05)in behavior scoring,SOD activity,content of MDA,Glu,GSH,neuron number and deviation rate of spinal cord.Between H Gln group and M Gln group,there was no significant difference in behavior scoring,content of MDA and Glu,SOD activity,neuron number and aberration rate in spinal cord(P>0.05),whereas there was a significant difference in SOD activity and Glu content(P<0.05).Conclusion Pretreatment with medium-dose glutamine has a protective effect on spinal cord ischemia-reperfusion injury in rabbits,which may be related to the maintenance of GSH content,increase of SOD activity and reduction of MDA. | Shou-ping Gong1,Da-lin Zhong1,Jian Lü1,Wen-tao Wang1,Gang Xu1,Qian Song1,Feng Wu2,Jin Che2,Zhi-yuan Seng1,Xi-jing He3 1.Department of Neurosurgery,the Second Affiliated Hospital,Medical School of Xi’an Jiaotong University,Xi’an 710004 2.Hemopathy Lab.,Medical School of Xi’an Jiaotong University,Xi’an 710061 3.Department of Orthopaedics,the Second Affiliated Hospital,Medical School of Xi’an Jiaotong University,Xi’an 710004,China | 2009 | Journal of Pharmaceutical Analysis2009，21，4： | 0 |
| 4 | Synthesis and Photochemistry of Diphenylchlorin and Diphenylbacteriochlorin显示文摘Diphenylchlorin (DPC) and diphenylbacteriochlorin (DPBC) were synthesized for the first time from reduction of 5,10-diphenylporphyrin (DPP). As photosensitizers they have sizable absorption in the red region of the visible spectrum. The high yield of DPC-photosensitized generation of 1O2, and the EPR studies in homogenerous solution showed that the photodynamic action of DPP-based photosensitizers may proceed via type I and type II machanisms. | Tian Yu WANG1, Jing Rong CHEN2, Jin Shi MA1* 1Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080 2Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100101 | 2001 | Chinese Chemical Letters2001，12，8： | 0 |
| 5 | A STUDY ON DNA ADDUCTION WITH NICOTINE-DERIVED NITROSAMINE BY ACCELERATOR MASS SPECTROMETRY显示文摘ASTUDYONDNAADDUCTIONWITHNICOTINE-DERIVEDNITROSAMINEBYACCELERATORMASSSPECTROMETRY￥XinSongLI1;YuanFangLIU1;JinYuanSHI1;xiangYun... | Xin Song LI1 Yuan Fang LIU1 Jin Yuan SHI1 xiang Yun WANG1 Ke Xin LIU2 Zhi Yu GUO2 Kun LI2, Chia Erh CHEN2 and Si Xun YUAN3 (1Department of Technical Physics, 2Institute of Heavy Ion Physics,3Department of Archaeology, Peking University, Beijing l0087 | 1994 | Chinese Chemical Letters1994，5，10： | 0 |
| 6 | The Dramatic Effect of Metal Precursor on the Catalytic Performance of Co/Sio_2 Catalyst for CO_2 Reforming of CH_4显示文摘The cobalt precursor affects the catalytic performance of Co/SiO2 catalyst remarkably. The catalyst prepared from cobalt acetate exhibits excellent activity, stability and resistance to carbon deposition. | Chuan Jing HUANG1,2 Jin Hua FEI1 Dong Jie WANG1,3 Xiao Ming ZHENG1 (1Institute of Catalysis, Xixi campus, Zhejiang University, Hangzhou 3 10028 2Department of Chemistry, Huaibei Coal Teachers College, Huaibei 235000 3Department of Chemistry, Ningbo Uni | 2000 | Chinese Chemical Letters2000，11，2： | 0 |
| 7 | Force Parameter Model of 3-Roll Mills for Continuous Cold Rolling Wires显示文摘Fromthetimewhen3-rollmillsareinvelltedtotheendof1970's,theyhadbeenusedinhotrollingofwirerods,especiallyinproducingofnon-ferrousmetals.Itisestimatedthatapproximately90%ofthewirerodsmadefromaluminumandaluminumalloyswereproducedonthe3-rollmillsatthattim... | Baolong Zheng1 Li Sun2 Ruichen An2 Jin Wang1 Weichang Zhu1(l Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China2 Tangshan iron and Steel Co. Ltd., Tangshan 063000, China) | 1999 | International Journal of Minerals,Metallurgy and Materials1999，13，4： | 0 |
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