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Study on Single-fiber Pull-out Meth.d for Evaluating Interfacial Strength.in CFRP

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h.gh.Tech.ology Letters 1995年第1期1卷 105-108页

作者： Yudong, h. zh.qian, zh. Lixun, L. Qiwei, L. h.rbin Inst of Tech.ology Harbin China

Single-fiber pull-out testing (SFPOT) meth.ds are frequently used to evaluate th. interfacial adh.sion between fiber and matrix in composite materials. To make such.pull-out measurements, h.wever, th. length.of embedded fiber must be small enough.so th.t th. fiber does not break before it is pulled freely. Th.s is difficult to ach.eve by conventional meth.ds with.fibers of small diameter, such.as th. carbon fibers. In th.s paper, a fiber pull-out experiment is described. Specialized apparatus in our laboratory, as well as th.s tech.ique for sample preparation are discussed in detail. Th. interfacial sh.ar strength.of carbon fiber/resin matrix composites is analyzed quantitatively by using th. finite-element meth.d. Th. SFPOT system h.s been proved to be an available means for th. study of interfacial properties for carbon fiber/resin matrix composites.

关键词： Carbon fiber Composite materials Interfacial sh.ar strength Single-fiber pull-out

REACTION OF 3,7-DINITRODIBENZOBROMOLIUM BISULFATE WITh.OME NUCLEOPh.LES

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Ch.nese Ch.mical Letters 1996年第6期7卷 505-506页

作者： h.u, ZJ zh.ng, h.zh.ng, zh LANzh.U UNIV INST ORGAN CHEMLANZHOU 730000PEOPLES R CHINA LANzh.U UNIV STATE KEY LAB APPL ORGAN CHEMLANZHOU 730000PEOPLES R CHINA

Reaction of 3,7-dinitrodibenzobromolium bisulfate with.some nucleoph.les were studied. Primary products of reactions ore 2-bromo-2'-Nu-4-4'-dinitro-biph.nyls.

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SUBSTRUCTURE PRECONDITIONERS FOR NONCONFORMING PLATE ELEMENTS

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Journal of Computational Math.matics 1998年第4期16卷 289-304页

作者： Sh., ZC Xie, zh Ch.nese Acad Sci ICMSEC State Key Lab Sci & Engn Comp Beijing 100080 Peoples R China Ch.nese Acad Sci Inst Atmospher Phys LASG Beijing 100080 Peoples R China

In th.s paper, we consider th. problem of solving finite element equations of bih.rmonic Dirich.et problems. We divide th. given domain into non-overlapping subdomains, construct a preconditioner for Morley element by substructuring on th. basis of a function decomposition for discrete bih.rmonic functions. Th. function decomposition is introduced by partitioning th.se finite element functions into th. low and h.gh.frequency components th.ough.th. intergrid transfer operators between coarse mesh.and fine mesh. and th. conforming interpolation operators. Th. meth.d leads to a preconditioned system with.th. condition number bounded by C(1 + log(2) h.h. in th. case with.interior cross points, and by C in th. case with.ut interior cross points, wh.re h.is th. subdomain size and h.is th. mesh.size. Th.se tech.iques are applicable to oth.r nonconforming elements and are well suited to a parallel computation.

关键词： substructure preconditioner bih.rmonic equation nonconforming plate element

Th. W-11-4A Platform Compreh.nsive Strength.Monitoring System

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Ch.na Ocean Engineering 1998年第2期13卷 135-146页

作者： Sh.n, zh.Li, h.Xue, YI Ch.n, JC zh.o, Q Ch.nese Acad Sci Inst Mech Beijing 100080 Peoples R China Louisiana Tech.Univ Appl & Computat Anal & Modeling Program Ruston LA 71272 USA Acad Sinica S China Sea Inst Oceanol Guangzhou 510301 Peoples R China

A compreh.nsive strength.monitoring system used on a fixed jacket platform is presented in th.s paper. Th. long-term monitoring of W-11-4A platform ach.eved. Structural responses (strain and acceleration) at selected locations, as well as associated environmental parameters, h.ve been obtained. Th. emph.sis of th. paper is placed on th. system design, and th. instrumentation and operation meth.dology employed in th. monitoring of th. structural responses. Th. performance of th. system and th. ch.racteristic results obtained during its 13-month.operation are also summarized.

关键词： monitoring tech.iques compreh.nsive strength.monitoring structural responses waterproof strain transducers underwater instrumentation tech.iques

Sensitive analysis of amino acids in injection liquor by reversed-ph.se h.LC

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Ch.nese Journal of Ch.mistry 1995年第2期13卷 163-168页

作者： Sh.NG, zh.YU, YN GUO, W JIANG, h.zh.U, LM Ch.NESE ACAD SCI DALIAN INST CHEM PHYSDALIAN 116012PEOPLES R CHINA

A convenient derivatization meth.d of amino acids with.1-fluoro-2,4-dinitrobezene as reaction reagent and a separation system were described. Th. derivative amino acids were separated on a specific ch.mically bonded ph.se column with.a simple linear gradient elution consisting of aqueous buffer and meth.nol. Th. eluate was detected by common ultraviolet absorption detector at 360 nm. Th. detection limits of amino acids were as low as 10 picomole. Th.s meth.d h.s been successfully applied to assay amino acid injection liquor used in h.spital. It h.s good reproducibility and precision. Th. procedures avoid th. requirements of particular derivative equipment and analyzer employed in conventional amino acid analysis.

关键词： AMINO ACIDS PRECOLUMN DERIVATIZATION REVERSED Ph.SE SEPARATION UV ABSORPTION DETERMINATION

Serum deprivation enh.nces DNA synth.sis of h.man h.patoma SMMC-7721 cells

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World Journal of Gastroenterology 1998年第2期4卷 29-32页

作者： Jiang, SM Xu, zh Sh.ndong Normal Univ Dept Biol Provincial Key Lab Anim Stress Jinan 250014 Shandong Provin Peoples R China

AIM To determine th. relationsh.p between serum deprivation or serum levels and cell proliferation of h.man h.patoma SMMC 7721 cells. METh.DS h.man h.patoma SMMC 7721 cells were grown in RPMI 1640 supplemented with.10% fetal calf (FCS) in 5% CO 2 incubator at 37℃ for 24h. , and culture media were replaced to serum free or different serum FCS levels (2 5%, 5%, 10%, 20% and 25%). Six h. 12h. , 18h. and 24h. after th. culture, th. cells were incorporated TdR for 4h. . At last TdR incorporation was detected with.liquid scintillation counting. RESULTS DNA synth.sis of SMMC 7721 cells could be sh.rply stimulated by sh.rt time (6h. serum deprivation (th. cpm value of 3h. TdR incorporation of cells in serum free was 39 32 fold h.gh.r th.n cells in 25% serum), and th. incorporation of 3h. TdR was negatively related to th. serum levels. Longer time serum starvation ( 12h. , 18h. and 24h. ) also greatly stimulated DNA synth.sis, alth.ugh.th. cpm value of 3h. TdR incroporation was less th.n th.t in 6h. serum deprivation. Morph.logy of cells cultured in different serum levels also sh.wed significant difference. CONCLUSIONS Compared with.oth.r cell lines such.as BEL7404 and Swiss 3T3, h.man h.patoma SMMC 7721 cells h.d different response to th. serum deprivation. Sh.rt time serum deprivation could greatly stimulate DNA synth.sis of h.man h.patoma SMMC 7721 cells. Precautions must be given to th. ch.nges of serum levels for th. detection of growth.factors and drugs using SMMC 7721 cells as a model.

关键词： liver neoplasms carcinoma, h.patocellular DNA, neoplasm/biosynth.sis SMMC 7721 tumor cell, cultured cell proliferation growth factors

A Mild and Practical Procedure for Tetrah.dropyranylation of Alcoh.ls and Ph.nols Catalysed by Anh.drous Ferrous Sulfate

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Ch.nese Ch.mical Letters 1998年第3期9卷 241-244页

作者： Li, TS zh.ng, zh.Jin, TS Li, YL h.bei Univ Dept Chem Baoding 071002 Hebei Peoples R China Lanzh.u Univ Natl Lab Appl Organ Chem Lanzhou 730000 Peoples R China

An easy preparation of tetrah.dropyranyl (Th.) eth.rs of alcoh.ls and ph.nols with.3,4-dih.dro-2h.pyran (Dh.) in refluxing dich.orometh.ne h.s been carried out in good to excellent yields under catalysis of anh.drous ... 详细信息

关键词： preparation tetrah.dropyranyl eth.rs protection of h.droxy catalysis anh.drous ferrous sulfate

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蛙,好特别!

少年时代（低年级） 2024年第3期 46-49页

作者：许安廷 h.Zell(图) 不详

大家都见过青蛙、牛蛙,是不是以为蛙蛙就长那样儿?嘿嘿,我要介绍(jiè sh.o)的几种蛙蛙,保证(bǎo zh.ng)让你们看了之后惊叹(jīng tàn):“哇,好特别!”

关键词：牛蛙 ng) 蛙

Synth.sis and h.drodesulfurization of zirconium binary nitrides

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Ch.nese Science Bulletin 1997年第15期42卷 1274-1278页

作者： zh.ng, YJ zh.o, XG zh.u, zh.Yan, Wh.Ying, PL Xin, Q Ch.NESE ACAD SCI DALIAN INST CHEM PHYSDALIAN 116023PEOPLES R CHINA

As a new material to be used widely in catalytic field, γ-Mo2N with.h.gh.specific surface area(usually, SBET>100 m2·g-1 h.s recently aroused much.attention. Its catalytic activities re-semble th.se of noble metals （Rh. Pd and Pt） in h.drogenation of h.drocarbon. Especially,it h.s some marvelous ch.racteristics for deep h.drodesulfurization （h.S）, h.drodeni-

关键词： h.gh surface area binary nitrides h.drodesulfurization h.-TPD.