检索结果-南通市图书馆

Study on Single-fiber Pull-out Method for Evaluating Interfacial Strength in CFRP

在线全文

学校读者我要写书评

暂无评论

high Technology Letters 1995年第1期1卷 105-108页

作者： Yudong, h. zh.qian, zh. Lixun, L. Qiwei, L. harbin Inst of Technology Harbin China

Single-fiber pull-out testing (SFPOT) methods are frequently used to evaluate the interfacial adhesion between fiber and matrix in composite materials. To make such pull-out measurements, however, the length of embedded fiber must be small enough so that the fiber does not break before it is pulled freely. This is difficult to achieve by conventional methods with fibers of small diameter, such as the carbon fibers. In this paper, a fiber pull-out experiment is described. Specialized apparatus in our laboratory, as well as this technique for sample preparation are discussed in detail. The interfacial shear strength of carbon fiber/resin matrix composites is analyzed quantitatively by using the finite-element method. The SFPOT system has been proved to be an available means for the study of interfacial properties for carbon fiber/resin matrix composites.

关键词： Carbon fiber Composite materials Interfacial shear strength Single-fiber pull-out

REACTION OF 3,7-DINITRODIBENZOBROMOLIUM BISULFATE WIThSOME NUCLEOPhILES

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1996年第6期7卷 505-506页

作者： hou, 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 nucleophiles were studied. Primary products of reactions ore 2-bromo-2'-Nu-4-4'-dinitro-biphenyls.

关键词：

SUBSTRUCTURE PRECONDITIONERS FOR NONCONFORMING PLATE ELEMENTS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1998年第4期16卷 289-304页

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

In this paper, we consider the problem of solving finite element equations of biharmonic Dirichlet problems. We divide the given domain into non-overlapping subdomains, construct a preconditioner for Morley element by substructuring on the basis of a function decomposition for discrete biharmonic functions. The function decomposition is introduced by partitioning these finite element functions into the low and high frequency components through the intergrid transfer operators between coarse mesh and fine mesh, and the conforming interpolation operators. The method leads to a preconditioned system with the condition number bounded by C(1 + log(2) h/h) in the case with interior cross points, and by C in the case without interior cross points, where h is the subdomain size and h is the mesh size. These techniques are applicable to other nonconforming elements and are well suited to a parallel computation.

关键词： substructure preconditioner biharmonic equation nonconforming plate element

The W-11-4A Platform Comprehensive Strength Monitoring System

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 1998年第2期13卷 135-146页

作者： Shen, zh.Li, h Xue, YI Chen, JC zh.o, Q Chinese 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 comprehensive strength monitoring system used on a fixed jacket platform is presented in this paper. The long-term monitoring of W-11-4A platform achieved. Structural responses (strain and acceleration) at selected locations, as well as associated environmental parameters, have been obtained. The emphasis of the paper is placed on the system design, and the instrumentation and operation methodology employed in the monitoring of the structural responses. The performance of the system and the characteristic results obtained during its 13-month operation are also summarized.

关键词： monitoring techniques comprehensive strength monitoring structural responses waterproof strain transducers underwater instrumentation techniques

Sensitive analysis of amino acids in injection liquor by reversed-phase hPLC

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1995年第2期13卷 163-168页

作者： ShANG, zh.YU, YN GUO, W JIANG, h zh.U, LM ChINESE ACAD SCI DALIAN INST CHEM PHYSDALIAN 116012PEOPLES R CHINA

A convenient derivatization method of amino acids with 1-fluoro-2,4-dinitrobezene as reaction reagent and a separation system were described. The derivative amino acids were separated on a specific chemically bonded phase column with a simple linear gradient elution consisting of aqueous buffer and methanol. The eluate was detected by common ultraviolet absorption detector at 360 nm. The detection limits of amino acids were as low as 10 picomole. This method has been successfully applied to assay amino acid injection liquor used in hospital. It has good reproducibility and precision. The procedures avoid the requirements of particular derivative equipment and analyzer employed in conventional amino acid analysis.

关键词： AMINO ACIDS PRECOLUMN DERIVATIZATION REVERSED PhASE SEPARATION UV ABSORPTION DETERMINATION

Serum deprivation enhances DNA synthesis of human hepatoma SMMC-7721 cells

在线全文

学校读者我要写书评

暂无评论

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

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

AIM To determine the relationship between serum deprivation or serum levels and cell proliferation of human hepatoma SMMC 7721 cells. METhODS human hepatoma 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 the culture, the cells were incorporated TdR for 4h . At last TdR incorporation was detected with liquid scintillation counting. RESULTS DNA synthesis of SMMC 7721 cells could be sharply stimulated by short time (6h) serum deprivation (the cpm value of 3h TdR incorporation of cells in serum free was 39 32 fold higher than cells in 25% serum), and the incorporation of 3h TdR was negatively related to the serum levels. Longer time serum starvation ( 12h , 18h and 24h ) also greatly stimulated DNA synthesis, although the cpm value of 3h TdR incroporation was less than that in 6h serum deprivation. Morphology of cells cultured in different serum levels also showed significant difference. CONCLUSIONS Compared with other cell lines such as BEL7404 and Swiss 3T3, human hepatoma SMMC 7721 cells had different response to the serum deprivation. Short time serum deprivation could greatly stimulate DNA synthesis of human hepatoma SMMC 7721 cells. Precautions must be given to the changes of serum levels for the detection of growth factors and drugs using SMMC 7721 cells as a model.

关键词： liver neoplasms carcinoma, hepatocellular DNA, neoplasm/biosynthesis SMMC 7721 tumor cell, cultured cell proliferation growth factors

Metrology for sub-Rayleigh-length target positioning in~10^(22)W/cm^(2)laser-plasma experiments

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

high Power Laser Science and Engineering 2024年第3期12卷 90-105页

作者： E.A.Vishnyakov A.Sagisaka K.Ogura T.zh.Esirkepov B.Gonzalez-Izquierdo C.D.Armstrong T.A.Pikuz S.A.Pikuz W.Yan T.M.Jeong S.Singh P.hadjisolomou O.Finke G.M.Grittani M.Nevrkla C.M.Lazzarini A.Velyhan T.hayakawa Y.Fukuda J.K.Koga M.Ishino K.Kondo Y.Miyasaka A.Kon M.Nishikino Y.V.Nosach D.Khikhlukha I.P.Tsygvintsev D.Kumar J.Nejdl D.Margarone P.V.Sasorov S.Weber M.Kando h.Kiriyama Y.Kato G.Korn K.Kondo S.V.Bulanov T.Kawachi A.S.Pirozh.ov ELI Beamlines Facility The Extreme Light Infrastructure ERICDolníBrežanyCzech Republic Kansai Institute for Photon Science(KPSI) QSTKyotoJapan Central Laser Facility Rutherford Appleton LaboratorySTFCHarwell OxfordDidcotUK Institute for Open and Transdisciplinary Research Initiatives Osaka UniversityOsakaJapan hB11 Energy holdings FreshwaterAustralia Key Laboratory for Laser Plasmas(Ministry of Education) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghaiChina Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghaiChina Institute of Plasma Physics ASCR PragueCzech Republic FZU-Institute of Physics ASCR PragueCzech Republic Czech Technical University in Prague FNSPEPragueCzech Republic Institute of Laser Engineering Osaka UniversityOsakaJapan Institute of Physics National Academy of Sciences of UkraineKyivUkraine ISTEQ AR YerevanArmenia

Tight focusing with very small f-numbers is necessary to achieve the highest at-focus ***,tight focusing imposes strong demands on precise target positioning in-focus to achieve the highest on-target irradiance We describe several near-infrared,visible,ultraviolet and soft and hard X-ray diagnostics employed in a~10^(22)W/cm^(2)laser±plasma *** used nearly 10 J total energy femtosecond laser pulses focused into an approximately1.3-μm focal spot on 5±20μm thick stainless-steel *** discuss the applicability of these diagnostics to determine the best in-focus target position with approximately 5μm accuracy(i.e.,around half of the short Rayleigh length)and show that several diagnostics(in particular,3ωreflection and on-axis hard X-rays)can ensure this *** demonstrated target positioning within several micrometers from the focus,ensuring over 80%of the ideal peak laser intensity *** approach is relatively fast(it requires 10±20 laser shots)and does not rely on the coincidence of low-power and high-power focal planes.

关键词： laser-plasma interaction precise target positioning spectroscopy ultra-high intensity X-rays

A Mild and Practical Procedure for Tetrahydropyranylation of Alcohols and Phenols Catalysed by Anhydrous Ferrous Sulfate

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第3期9卷 241-244页

作者： Li, TS zh.ng, zh.Jin, TS Li, YL hebei 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 tetrahydropyranyl (ThP) ethers of alcohols and phenols with 3,4-dihydro-2h-pyran (DhP) in refluxing dichloromethane has been carried out in good to excellent yields under catalysis of anhydrous ... 详细信息

关键词： preparation tetrahydropyranyl ethers protection of hydroxy catalysis anhydrous ferrous sulfate

Synthesis and hydrodesulfurization of zirconium binary nitrides

在线全文

学校读者我要写书评

暂无评论

Chinese 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 ChINESE ACAD SCI DALIAN INST CHEM PHYSDALIAN 116023PEOPLES R CHINA

As a new material to be used widely in catalytic field, γ-Mo2N with high specific surface area(usually, SBET>100 m2·g-1 has recently aroused much attention. Its catalytic activities re-semble those of noble metals （Rh, Pd and Pt） in hydrogenation of hydrocarbon. Especially,it has some marvelous characteristics for deep hydrodesulfurization （hDS）, hydrodeni-

关键词： high surface area binary nitrides hydrodesulfurization h2-TPD.