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| 1 | Determination of Elastic and Creep Properties of Thin-film Systems from indentation Experiments显示文摘Based on the detailed computer .simulation of the indentation testing on the thin-film systems, the present paper explores the detailed procedure of determining elastic properties (elastic modulus E(f) and Poisson ratio v(f) ) and creep parameters (CCREEP (f) and nCREEP (f)) for a simple Norton law (ε=CCREEP (f)σnCREEP(f), where ε is creep strain rate, and σ is the stress) material for a thin film coated on a creep substrate, whose elastic properties(E(s) and v(s)) and creep properties (CCREEP(s) and nCREEP(s) ) of the substrate are known, from indentation elastic and creep testing, respectively. The influences of the thickness of the thin-film and the size of the indenter on the indentation behavior have been discussed. It is shown that the boundary between the thin film and the substrate has great influence on the indentation creep behavior. The relative sizes of indentation systems are chosen so that the behavior of the indentation on the film is influenced by the substrate. The two elastic parameters E(f) and v(f) of the film are coupled on the influence of the elastic behavior of indentation. With the two different size indenters, the two elastic parameters E(f) and v(f) of the film can be uniquely determined by the indentation experimental slopes of depth to applied net section stress results. The procedure of determining of the two Norton law parameters CCREEP (f) and nCREEP(f) includes the following steps by the steady indentation rate d. The first step to calculate the creep indentation rate on certain loads of the two different sizes of indenters on a set of assumed values of CCREEP (f) and nCREEP (f). Then to build relationship between the creep indentation rate and the assumed CCREEP(f) and nCREEP(f). With the experimental creep indentation rate to intersect two sets of CCREEP (f) and nCREEP(f), which have the same values of d. The last step is to build the CCREEP(f) and nCREEP(f)curves from the intersection points for the two indenters.These two curves CCREEP and nCREEP(f) will intersect at one point. The axial values of the point are what we want. The procedure presented in the paper to determine the elastic parameters and creep parameters from the indentation experiments can be applied to any material systems. | Z.F.Yue and G.Eggeler (Institut fur Werkstoffe, Ruhr-Universitat Bochum, 44 801 Bochum, Germany) | 2000 | Journal of Materials Science & Technology2000，16，6： | 8 |
| 2 | A Coupled Variable Coefficient Modified KdV Equation Arising from a Two-Layer Fluid System显示文摘A quite general coupled variable coefficient modified KdV (VCmKdV) equation in a two-layer fluid systemis derived by means of the reductive perturbation method.Making use of the CK's direct method,some similarityreductions of the coupled VCmKdV equation are obtained and their corresponding group explanations are discussed.Some exact solutions of the coupled equations are also presented. | GAO Yuan~1 and TANG Xiao-Yan~(1,2)~1 Department of Physics,Shanghai Jiao Tong University,Shanghai 200240,China~2 Institut Für Theoretische Physik IV,Fakultt für Physik und Astronomie,Ruhr-Universitt Bochum,D-44870 Bochum,Germany | 2007 | Communications in Theoretical Physics2007，，12： | 3 |
| 3 | Direct self-control ( DSC ) of inverter-fed induction machine 显示文摘 | DEPENBROCK M RUHR-UNIV BOCHUM | 1988 | IEEE Transactions on Power Electronics1988，3，4： | 1 |
| 4 | Induced micronucleus frequencies in peripheral lymphocytes as a screening test for carrriers of BRCA1 mutation in breast cancer families 显示文摘 | Andreas RothfuB Petra Schutz Sylvia Bochum | 2000 | Cancer Research2000，60，2： | 1 |
| 5 | Induced micronucleus frequencies in peripheral lymphocytes as a screen test for carriers of a BRCA1 mutation in breast cancer families显示文摘 | Rothfuss A Schutz P Bochum S | 2000 | Cancer Res2000，60，2： | 1 |
| 6 | Control of the induction machine in traction显示文摘 | Steimel A Bochum | 1998 | EB1998，12，： | 1 |
| 7 | Near- and far- field properties of annual CO2 waveguide lasers 显示文摘 | Bochum H | 1997 | Appl Opt1997，36，15： | 1 |
| 8 | Prevalence,molecular characterization,and phenotypic confirmation of extended-spectrum beta-lactamases in Escherichia coli,Klebsiella pneumoniae,and Klebsiella oxytoca at the Radboud University Nijmegen Medical Centre in The Netherlands显示文摘 | STURM P D BOCHUM E T VAN S V | 2010 | Microb Drug Resist2010，，： | 1 |
| 9 | Control of the Induction Machine in Traction显示文摘 | SteimelA Bochum | 1998 | eb1998，，12： | 1 |
| 10 | Prevalence, molecular characterization, and phenotypic confirmation of extended-spectrum beta-lactamases in escherichia coli, klebsiella pneumoniae, and klebsiella oxytoca at the Radboud University Nijmegen Medical Centre in The Netherlands 显示文摘 | Sturm PD Bochum ET Van Mook-Vermulst SV | 2010 | Microb Drug Resist2010，16，1： | 1 |
| 11 | Control of the Induction Machine in Traction显示文摘 | A Steimel Bochum | 1998 | eb1998，12，： | 1 |
| 12 | 依他尼酸抑制胰腺外分泌(英文)显示文摘瞄准:胰腺的外分泌分泌物上的 ethacrynic 酸的效果工作,有在胰腺的腺泡房间的能分泌的过程的干扰的潜在的机制被调查。方法:在有为 30 的 ethacrynic 酸的孵化以后, min,刺激 caerulein 的淀粉酶版本和缩胆囊素(CCK ) 受体绑定特征在孤立的老鼠被估计胰腺的腺泡。巯基组(谷胱甘肽和蛋白质 thiols ) 和 cytosolic 的水平免费的钙在胰腺的腺泡房间被测量。结果:Ethacrynic 酸减少了没有房间损坏的显著增加, caerulein (0.1 nmol/L ) 以一种集中依赖者方式刺激了淀粉酶版本和胰腺的腺泡谷胱甘肽的水平。Ethacrynic 酸也禁止了导致的 caerulein (1 nmol/L ) 在胰腺的腺泡房间的 Ca2+ 动员。但是既不蛋白质巯基也不 CCK 受体绑定特征被 ethacrynic 酸改变。结论:Ethacrynic 酸由谷胱甘肽的弄空和导致 caerulein 的 Ca2+ 的下面规定禁止胰腺的外分泌分泌物动员。谷胱甘肽可能在胰腺的腺泡房间并且处于在尖锐胰腺炎观察的能分泌的封锁在能分泌的过程起一个潜在的作用。 | YU Hong-Gang, KLONOWSKI-STUMPE Hanne ( Division of Gastroenterology, Hepatology, and Infectious Diseases, Department of Medicine, Heinrich-Heine-University of Duesseldorf, Duesseldorf, Germany)Department of Medicine,St-Josef Hospital,University of Bochum,Gudrunstr 56,44791 Bochum,Germany | 2001 | Acta Pharmacologica Sinica2001，22，11： | 1 |
| 13 | Prevalence, molecular characterization, and phenotypic confirmation of extended spectrum beta-lactamases in Escherichia coli, Klebsiella pneumoniae, and Klebsiella oxytoca at the Radboud University Nijmegen Medical Centre in The Netherlands显示文摘 | Sturm PD Bochum ET van Mook-Vermulst SV | 2010 | Microb Drug Resist2010，16，1： | 1 |
| 14 | Prevalence,molecular characterization,and phenotypic confirmation of extended-spectrum beta-lactamases in Escherichia coli,Klebsiella pneumoniae,and Klebsiella oxytoca at the Radboud University Nijmegen Medical Centre in the netherlands显示文摘 | Patrick DJ Sturm ET Bochum M | | 0，，01： | 1 |
| 15 | Control of the Induction Machine in Traction显示文摘 | Steimel A Bochum | 1998 | Eb1998，12，： | 1 |
| 16 | Control of the Induction Machine in Traction显示文摘 | Steimel A Bochum | 1998 | Eb1998，，12： | 1 |
| 17 | MAGNETIC ANISOTRIPY IN SPUTTERED NdFeB FILMS显示文摘The amorphous and crystalline NdFeB films were prepared by RF sputtering at differentsubstrate temperatures.The crystalline specimens,prepared at 600℃ have strong perpendicu-lar anisotropy and high coercivity.And the cystallized alloy from amorphous state also hasstrong perpendicular anisotripy. | Gu Benxi Zhai Hongru Nanjing University,Nanjing,ChinaH.Homburg S.Methfessel Ruhr-University Bochum,Germany | 1992 | Acta Metallurgica Sinica(English Letters)1992，5，8： | 0 |
| 18 | Correlation between Thermal Expansion and Magnetic Characteristics of Fe-Ni Alloys in Fe_(1-x)Ni_x/Cu Superlattices显示文摘Thermal expansion behaviors of FeNi alloys were investigated by means of X-ray diffraction technique within a Fe1 -xNix/Cu superiattice structure. It was found that with a Ni concentration of x = 0.35, FeNi alloy layers showed the well-known Invar behavior, but for alloy layers with either lower or higher Ni concentrations, thermal expansion coefficients were larger. Based on results of magnetic measurements it is concluded that FeNi alloy layers with Ni concentrations lower than the Invar composition are in a superparamagnetic state which leads not only to low spontaneous magnetizations but also to large thermal expansions of the alloy layers. | Weizhong Tang H Zabel(Matrial Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China)(Institute of Experimental Physics/Solid State Physics, Ruhr University Bochum, 44780 Bochum, Germany) | 1998 | International Journal of Minerals,Metallurgy and Materials1998，12，3： | 0 |
| 19 | Computer Simulation of the Indentation Creep Tests on Particle-Reinforced Composites显示文摘A systematical simulation has been carried out on the indentation creep test on particle-reinforced composites. The deformation, failure mechanisms and life are analyzed by three reasonable models. The following five factors have been considered simultaneously: creep property of the particle, creep property of the matrix, the shape of the particle,the volume fraction of the particle and the size (relative size to the particle) of the indentation indenter. For all the cases, the power law respecting to the applied stress can be used to model the steady indentation creep depth rate of the indenter, and the detail expressions have been presented. The computer simulation precision is analyzed by the two-phase model and the three-phase model. Two places of the stress concentration are found in the composites.One is ahead of the indentation indenter, where the high stress state is deduced by the edge of the indenter and will decrease rapidly near to a steady value with the creep time. The other one is at the interface, where the high stress state is deduced by the misfit of material properties between the particles and matrix. It has been found that the creep dissipation energy density other than a stress parameter can be used to be the criterion to model the debonding of the interfaces. With the criterion of the critical creep dissipation energy density, a power law to the applied stress with negative exponent can be used to model the failure life deduced by the debonding of interfaces. The influences of the shape of the particles and the matching of creep properties of particle and matrix can be discussed for the failure. With a crack model, the further growth of interface crack is analyzed, and some important experimental phenomena can be predicted. The failure mechanism which the particle will be punched into matrix has been also discussed. The critical diflerences between the creep properties of the particles and matrix have been calculated,after a parameter has been defined. In the view of competition of failure mechanisms, the best matching of the creep properties of the two phases and the best shape of the particles are discussed for the composite design. | Zhufeng YUE1,2)1)Department of Engineering Mechanics, Northwestern Polytechnical University, Xi’an 710072, China2)Institute of Materials, Ruhr University, 44780 Bochum, Germany | 2002 | Journal of Materials Science & Technology2002，18，4： | 0 |
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