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  • 1
    Electronic Resource
    Electronic Resource
    Multiaxial Electromechanical Couple Behavior of Ferroelectric Ceramic PZT53 (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 463-470 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The multi-axial constitutive behavior of poled and unpoled ferroelectric ceramic PZT53is measured under different proportional tension-torsion loading and compression-torsion loadinguntil destroy. Deformation is measured using strain gauges. These results are used to map out“Switching” and “destroy” surfaces. The two surfaces are found to be a function of the polarization.Switching surface is similar to Mises and Tresca yield surface. Destroy behavior corresponds tomaximal principal normal stress rule. For poled PZT53, the effect of bias electric field on itsmultiaxial behavior has also been exploited.The results indicated that the “Switching” surfacedisappear with the increased bias electric. The ultimate goal is to develop an experimentallyvalidated micromechanics based phenomenological constitutive model for ferroelectric materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.463.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Finite Element Simulation of Superplastic Isothermal Forging Process for Nickel-Base PM Superalloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 297-302 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The Chinese nickel-base powder metallurgy (PM) superalloy FGH96, which wasprocessed through hot isostatic pressing, is very difficult to deform. FGH96 superalloy has bettersuperplasticity in special deformation conditions and superplastic isothermal forging is the bestformation method at present. The accurate constitutive equations of the FGH96 alloy was establisheddepended on the isothermal compression experiments. A two dimensional and thermomechanicalcoupled axisymmetric finite element(FE) model in which both part and die were taken inconsideration was established to fully simulate the FGH96 superalloy turbine disk superplasticisothermal forging process. Some physical parameters about the turbine disk forging process, such asload, stress field and strain field were calculated at different temperature within the forging range ofFGH96. The regularity of peak equivalent stress acted on die cavity surface, yield limit and ultimatestrength of die material during the forging process was found. Based on the regulation, peakequivalent stress acted on cavity surface must be extremely less than yield limit of die material, theoptimized processing parameter 1050°C that is the best deformation temperature for the alloy wasdetermined. That was proved better in practice and high quality disk was forged
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.297.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Development of crystal pulling techniques in China
    Amsterdam : Elsevier
    Progress In Crystal Growth And Characterization 11 (1985), S. 327-333 
    Details
    ISSN: 0146-3535
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0146-3535(85)90016-4
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  • 4
    Electronic Resource
    Electronic Resource
    Resonant tunneling of Si nanocrystals embedded in Al2O3 matrix synthesized by vacuum electron-beam co-evaporation (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 538-540 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High vacuum electron-beam co-evaporation, followed by N2 annealing at 500 °C is used for preparing of silicon nanocrystals (Si NCs) embedded in Al2O3 dielectric matrix. X-ray diffraction and transmission electron microscopy are used to investigate the structures of Si+Al2O3 films and estimate the mean diameter of the Si NCs. The electrical properties of the diode containing Si NCs embedded in Al2O3 are studied at room temperature and resonant tunneling effect with large voltage gap is observed. A circuit model based on resonant tunneling is proposed to simulate the measured I–V curve. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1491298
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  • 5
    Electronic Resource
    Electronic Resource
    Chiral chromatography of amino- and hydroxy-acids on surface modified porous graphite (1995)
    Springer
    Chromatographia 40 (1995), S. 9-14 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Porous graphite ; Chiral stationary phase ; Copper complexation chromatography ; Amino acids ; Hydroxy acids ; Adsorbed stationary phases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new type of chiral stationary phase has been prepared by coating porous graphite with a near-monolayer of an adsorbed enantiomeric modifier which then acts as an adsorbed stationary phase. The most effective modifiers are L- or D-isomers of N-(2-naphthalene-sulphonyl)-phenylalanine (NS-Phe). Conveniently 80% of monolayer coverages, corresponding to 1.2 μmol m−2, are achieved by adsorption of NS-Phe from methanolic solution. Enantiomeric separations by complexation with cupric ion show base-line resolution of α-amino and α-hydroxy acids with separation factors up to 2. Identical separations are achieved with chiral phases made from the L- and D-isomers of NS-Phe except that the elution orders of enantiomers are inverted. Reduced plate heights are around 5 and the adsorbed chiral phases are extremely stable, retention ratios being unchanged after passage of 7000 column volumes of eluent. A mechanism of retention is proposed, which fits the experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02274600
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  • 6
    Electronic Resource
    Electronic Resource
    Surface modification of porous graphite for ion exchange chromatography (1996)
    Springer
    Chromatographia 42 (1996), S. 83-88 
    Details
    ISSN: 1612-1112
    Keywords: Ion exchange chromatography ; Porous graphite ; Adsorptive stationary phases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Three distinct types of weak anion exchanger have been prepared by adsorption of polyethyleneimine (PEI) on to porous graphite (PGC): PGC coated dynamically with PEI, PGC coated with. an insoluble monolayer of PEI, and PGC coated with a cross-linked polymeric PEI. Using model solutes iodate, bromide, nitrate and nitrite, dissolved in aqueous buffers, the modified PGC's show typical ion exchange behaviour, and give chromatographic performance similar to that of bonded ion-exchange silica gels. Retention is reduced by increasing the ionic strength of the buffer, and by increasing the pH. A mechanism to explain the observed trends is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02271060
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  • 7
    Electronic Resource
    Electronic Resource
    Recruitment of functional GABA A receptors to postsynaptic domains by insulin (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 388 (1997), S. 686-690 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Modification of synaptic strength in the mammalian central nervous system (CNS) occurs at both pre- and postsynaptic sites,. However, because postsynaptic receptors are likely to be saturated by released transmitter, an increase in the number of active postsynaptic receptors may be a more ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/388686a0
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  • 8
    Electronic Resource
    Electronic Resource
    An Analysis about Response of Small Structure Suffered Underwater Explosion (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 293-294 (Sept. 2005), p. 685-694 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: According to the characteristics of anti-explosion analysis about the small cylindricalshell structure under water, in which the wave scattering is so great that it cannot be ignored, an approximate procedure is proposed to analyze the shock load of the structure suffered underwater explosion. The shock wave is decomposed as the summation of plane harmonic waves with various frequencies, then the scattered acoustic field around the cylindrical structure is studied, by which the overall pressure distribution on the surface of the structure can be obtained. The average overall pressure of the structure suffered underwater explosion can be calculated also, which can be considered as the underwater explosive load. An underwater explosion trial is done in a lake to validate the proposed procedure, and the results show that the overall pressure distribution on the surface predicated by the procedure theoretically nicely agree with the results of trial. Then, the time history of stresses from the trial is quite close to that from numeric simulation. The procedure is understood easily, and can be applied in analyzing the time history of stresses of small cylindrical structures impacted by shock wave, in which the wave scattering of structures plays a key part
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.293-294.685.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    The driving force for solute retention in electron donor-acceptor chromatography: Electrostatic versus charge-transfer interactions (1998)
    Springer
    Chromatographia 48 (1998), S. 523-528 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Retention mechanism ; Donor-acceptor complex ; Molecular interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Charge-transfer interactions are often assumed to be dominant among the noncovalent interactions that govern the solute retention in electron donor-acceptor chromatography. This popular view, however, has been called into question by recent studies that suggest an important role for electrostatic interactions in the formation of donor-acceptor complexes. We reported here an experimental investigation concerning the question as to whether charge-transfer or electrostatic interactions are the driving force for solute retention in donor-acceptor chromatography. Using three chromatographic systems composed of a dinitrobenzene derived stationary phase and a hexane based mobile phase, we determined retention factors for a range of aliphatic and aromatic hydrocarbons and correlated them with molecular properties that describe the solute's dispersion, charge-transfer, and electrostatic characteristics. It was found that the molecular polarizability and ionization potential give either very poor or no correlation with solute retention whereas the molecular quadrupole moment is a linear function of the logarithmic retention factor. These results were interpreted as showing that electrostatic, rather than charge-transfer or dispersion, interactions play a major role in determining solute retention. The dominance of the electrostatic interactions over the other noncovalent interactions was discussed in terms of distance dependency of the interaction energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466644
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