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Numerical Study on Lateral Buckling Mode of Pipelines Laid on A Sleeper

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China Ocean Engineering 2023年第3期37卷 495-505页

作者： liU Run HAO Xin-tong li cheng-feng YU Zheng li Qing-xin State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China

Because non-buried submarine pipelines under cyclic thermal loading are prone to global buckling,sleepers are commonly laid along the pipeline route to induce a series of relatively small and controllable lateral buckling.A finite element model which can simulate the transformation of pipeline laid on a sleeper from vertical buckling to lateral buckling is established in this *** parameters of sleeper affecting pipeline buckling modes are analysed,and a new kind of sleeper is proposed aimed at avoiding antisymmetric *** show that the lateral trigger force can avoid antisymmetric lateral buckling when acting between 1℃and 13℃before the critical buckling *** range increases slightly with increasing trigger *** with an ordinary sleeper,the proposed new sleeper with slider can reduce the critical buckling temperature by 25%,which significantly improves the success rate of sleepers.

关键词： submarine pipeline buckling mode initial imperfection new sleeper

Growth of Aligned Carbon Nanotubes on Large Scale by Methane Decomposition with Deactivation Inhibitor

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Journal of Natural Gas Chemistry 2007年第4期16卷 382-388页

作者： Hao Yu Zhili li cheng Zhang feng Peng Hongjuan Wang School of Chemical and Energy Engineering South China University of Technology Guangzhou 510650 Guangdong China

The effects of additives containing iron or nickel during chemical vapor deposition （CVD） on the growth of carbon nanotubes （CNTs） by methane decomposition on Mo/MgO catalyst were investigated. Ferrocene and nickel nitrate were introduced as deactivation inhibitors by in-situ evaporation during CVD. The precisely controlled in-situ introduction of these inhibitors increased the surface renewal of catalyst, and therefore prevented the catalyst from deactivation. Using this method, aligned multi-walled CNTs with parallel mesopores can be produced on a large scale.

关键词： aligned carbon nanotubes chemical vapor deposition deactivation inhibitor methane decomposition Mo/MgO catalyst ferrocene nickel nitrate

Synthesis, Structure, and Magnetic Properties of One Polyoxometalate (W/Mo) Compound: H_8K{[Ni(H_2O)_5]_2(H_2Mo_(1.80)W_(10.20)O_(42))}Cl_3·16H_2O

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Chinese Journal of Structural Chemistry 2007年第5期26卷 599-605页

作者： liU Ying DOU Jian-Min WANG Da-Qi ZHANG Xian-Xi li Da-cheng XU feng ZHOU Lei College of Chemistry and Chemical Engineering Liaocheng University Liaocheng 252059 China

One new polyoxometalate compound connected via nickel/potassium cations, H8K{[Ni（H2O）5]2（H2Mo1.80W10.20O42）}Cl3·16H2O 1, was prepared and characterized by elemental analysis and IR spectroscopy. Single-crystal X-ray diffraction analysis results reveal that clusters of [Ni（H2O）5]2（H2Mo1.80W10.20O42）}^6-in compound 1 are linked by potassium cations to form one- dimiensional chains, based on which a three-dimensional network is further constructed via the hydrogen bonds of O…O and O…Cl. Magnetic measurements show that compound 1 has paramagnetic properties. Crystal data： H62Cl3KMo1.80Ni2O68W10.20, Mr = 3461.33, monoclinic, space group C2/c, a = 18.9291（19）, b = 16.6758（17）, c = 19.1064（19）A, β = 106.6880（10）°, V = 5777.1（10）A^3, Z = 4, Dc = 3.980 g/cm^3, F（000） = 6250, μ = 21.574 mm^-1, R = 0.0579 and wR = 0.1623 （Ⅰ 〉 2σ（Ⅰ））.

关键词： polyoxomolybdate molybdate nickel sodium X-ray analysis magnetic

Syntheses and Crystal Structures of Four New Complexes [Mn(4,4′-bip)_2(OH_2)_4](DBA)·4H_2O and [M(OH_2)(HDPA)_2]·3H_2O (M = Mn,Co,Ni)

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Chinese Journal of Structural Chemistry 2006年第8期25卷 895-902页

作者： liU Ying DOU Jian-Min WANG Da-Qi li Da-cheng XU feng ZHOU Lei SU Huai-Jing College of Chemistry and Chemical Engineering Liaocheng University 252059 China

Four new transition metal complexes, [Mn（4,4′-bip）2（OH2）4]（DBA）-4H2O 1 （4,4′-hip = 4,4′-bipyridine, H2DBA = benzene-1,3-dicarboxylic acid） and [M（OH2）（HDPA）2]-3H2O （M = Mn 2, M = Co 3, M = Ni 4, H2DPA = 2,6-pyridine-dicarboxylic acid）, have been prepared from the reaction of transition metals and carboxylic acids, and characterized by X-ray and elemental analyses. For compound 1, the packing diagram shows that a three-dimensional network is formed via hydrogen bonds and strong π-πinteractions. For compounds 2, 3 and 4, a double-helical chain is formed through hydrogen bonds. Moreover, a three-dimensional network is constructed from chains via complicated hydrogen bonds between crystal water molecules and oxygen atoms of HDPA^-.

关键词： manganese cobalt nickel 4,4′-bipyridine benzene-1,3-dicarboxylic acid 2,6-pyridine-dicarboxylic acid X-ray analysis

Cerebral syphilitic gumma misdiagnosed as brain abscess: A case report

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World Journal of Clinical Cases 2024年第3期12卷 650-656页

作者： li-Kun Mu li-feng cheng Jing Ye Meng-Yan Zhao Jin-Long Wang Department of Neurosurgery Shengli Oilfield Central HospitalDongying 257099Shandong ProvinceChina

BACKGROUND Cerebral syphilitic gumma is a relatively rare clinical *** clinical manifest-ations are non-specific,and the imaging manifestations are similar to other in-tracranial occupying lesions,often misdiagnosed as tumors or *** are few reports on this disease in the relevant *** our knowledge,we have reported the first case of cerebral syphilitic gumma misdiagnosed as a brain *** report this case and provide useful information for clinical doctors on neurosyphilis *** SUMMARY We report the case to explore the diagnostic essentials of cerebral syphilitic gumma and attempt to mitigate the rates of misdiagnosis and missed diagnosis by equipping physicians with knowledge of neurosyphilis *** cli-nical diagnosis and treatment of a patient with cerebral syphilitic gumma were *** manifestations,classifications,and diagnostic points were retro-spectively *** patient was admitted to the hospital with fever and limb *** magnetic resonance imaging showed multiple space-occupying lesions and a positive serum Treponema pallidum gelatin agglutination *** patient was misdiagnosed as having a brain abscess and underwent a craniotomy.A postoperative pathological diagnosis of syphilis gumma was *** patient improved and was discharged after penicillin anti-syphilis ***-up recovery was *** Cerebral syphilitic gumma is rare in clinical practice,and it is often misdiagnosed and *** diagnosis should be considered in combination with multiple examinations.

关键词： Neurosyphilis Cerebral syphilitic gumma Brain abscess Misdiagnosis Treatment Case report

Relationship between archaeological sites distribution and environment from 1.15 Ma BP to 278 BC in Hubei Province

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Journal of Geographical Sciences 2011年第5期21卷 909-925页

作者： li Lan WU li ZHU cheng li feng MA Chunmei School of Geographic and Oceanographic Sciences Nanjing University Nanjing 210093 China

A total of 1362 archaeological sites from the Paleolithic Age to the Warring States time in Hubei Province increase gradually from west to east and from high land to low *** number of Paleolithic sites with altitude of 50-500 m account for 78% of the whole,while 71%-95% of sites from the Neolithic Age to the Warring States time mainly distribute at the areas of 0-200 *** temporal-spatial distribution of archeological sites in this area is affected by two *** one thing,the human beings of every period need to choose the first or the second terrace as living sites which are near water source and are easy to withstand ***,affecting by the regional tectonic uplift since the Holocene,down cutting of rivers can form new river valley,and lateral erosion and accumulation of river in stable time of tectonic movement can result in increasing of many new ***,the human beings migrated to adapt to the change of terrace location,leading to the sites increase gradually in the lower areas of the central and eastern parts of this *** other things,the temporal-spatial distribution of archeological sites in this area is affected by the climate *** Paleolithic sites mostly distribute in the Hanshui River Valley in northeastern Shiyan,southeast of Jinzhou and east of Jinmen,which is because rivers distributed in higher areas in this *** the chengbeixi Culture period,the sites are rare in the quondam Paleolithic sites distribution area,but increase obviously along the Yangtze River near the southwest *** spore-pollen record of Dajiuhu Basin indicates that only 23 chengbeixi cultural sites may be related to more precipitation and flood during the Holocene wet and hot *** Daxi Culture,Qujialing Culture and Shijiahe Culture are corresponding to middle and top of the Dajiuhu spore-pollen Zone Ⅳ,during which the climate is in order as a whole and is propitious to agricultural *** the Qujialing Culture

关键词： Hubei Province the Paleolithic Age to the Warring States time temporal-spatial distribution of archeological sites river landform pollen record environmental evolution

基于异质结界面优化的光子晶体二极管单向传输特性研究

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物理学报 2014年第15期63卷 213-218页

作者：程立锋任承王萍冯帅烟台大学光电信息科学技术学院烟台264005 中央民族大学理学院北京100081

基于光子晶体异质结结构的全光二极管是目前的一个研究热点,使其具有更好的单向传输特性是研究的一个目标.本文中通过改变异质结界面处的光子晶体结构,提出了不同的优化设计方案,在宽频带内实现了高对比度全光二极管的高效率单向传输,... 详细信息

基于光子晶体异质结结构的全光二极管是目前的一个研究热点,使其具有更好的单向传输特性是研究的一个目标.本文中通过改变异质结界面处的光子晶体结构,提出了不同的优化设计方案,在宽频带内实现了高对比度全光二极管的高效率单向传输,并且该结构还具有分束特性.

关键词：光子晶体二极管单向传输异质结

Design, Synthesis and Biological Evaluation of Non-azole Inhibitors of Lanosterol 14α-Demethylase of Fungi

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Chinese Chemical Letters 2006年第9期17卷 1189-1192页

作者： Bin YAO You Jun ZHOU Jü ZHU Jia Guo Lü Yao Wu li Jun cheng Qing feng JIANG Can Hui ZHENG School of Pharmacy Second Military Medicial University Shanghai 200433

Novel tetralin compounds were designed and synthesized on the three-dimensional model of lanosterol 14α-demethylase of Candida albicans. All of the lead compounds exhibited potent antifungal activities, especially compounds 16, 20. The mode of the action of the lead compounds was different from that of azoles. The present study affords the possibility to develop novel antifungal agents that specifically interact with the amino acid residues in the active site and avoid the serious toxicity arising from coordination binding with the heme of mammalian P450s.

关键词： Antifungal 2-aminotetralins lanosterol 14α-demethylase inhibitor.

Establishment of environmental specimen bank in Shanghai

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Journal of Environmental Sciences 2000年第4期12卷 398-401页

作者： ZHANG Yuan xun, WANG Yin song, QIAN Yin , TAN Ming guang, ZHI Ming, li De yi, cheng feng, ZNANG Gui lin (Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai 201800, China) Shanghai Institute of Nuclear Research Chinese Academy of Sciences Shanghai 201800 China

The program of the Shanghai Environmental Specimen Bank (SESB) has been established recently and its current status is briefly described. Typical specimen such as water and sediment of Suzhou creek, city particulate matter are collected and some results which have been obtained during the long term permanent operation of this project since 1998 are presented. Moreover, further aspects of environmental data evaluation and assessment are discussed.

关键词： specimen bank environment ecology