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  • 11
    Electronic Resource
    Electronic Resource
    Analysis of Mixed Mode Cracks in Two-Dimensional Magnetoelectroelastic Media (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 403-406 
    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: Based on the analytical solution for an elliptical cavity and the self-consistent method,the exact solutions for a crack in a two-dimensional magnetoelectroelastic medium is derived. Thestrain energy density factors are calculated for mixed mode cracks in a composite made of BaTiO3as the inclusion and CoFe2O4 as the matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.403.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    Effect of V〈sub〉2〈/sub〉O〈sub〉5〈/sub〉 Additive on the Microstructure and Electrical Properties of Mn-Co-NiO NTC Thermistor (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 743-745 
    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: The aim of this paper is to investigate the effects of V2O5 additive on the electrical properties ofNTC thermistors based on Ni0.5Co0.5Mn2O4.The XRD analyses indicate that single spinel phase can form,and V2+ions are in the octahedral interspace. The cell can be enlarged due to the V2O5 additive. Theresistivities (ρ) and the material constant (B) increase obviously, the reasons of which are mainlyattributed to the outer electron configuration of V2+ and cell enlargement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.743.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    Research on Surface Roughness and Micro-Topography of Nano-ZrO〈sub〉2 〈/sub〉 Plate in Two-Dimension Ultrasonic Grinding (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 53-54 (July 2008), p. 243-247 
    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 influence of ultrasonic vibration on the surface roughness and micro-topography ofceramics plate is discussed in this paper. Grinding assisted by two-dimensional ultrasonic vibration isdeveloped to deal with the processing difficulty of ceramic materials due to its hard-brittle property.The experimental results show that the surface roughness value obtained in two-dimensionalultrasonic grinding nano-ZrO2 ceramic plate specimen is obviously smaller than that in commongrinding, and the scratched grooves on the machined surface in ultrasonic grinding is wider andrelatively smoother than that in common grinding. Consequently, it proves that the two-dimensionalultrasonic machining is a feasible, high-efficient machining method for hard-brittle materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.53-54.243.pdf
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  • 14
    Electronic Resource
    Electronic Resource
    Bioinspired Growth of Hydroxyapatite Nanocrystals on PLGA- (PEG- ASP)n Scaffolds Modified with Oligopeptide Derived from BMP-2 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 1261-1264 
    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: Natural bone is a typical example of an “organic matrix-mediated” biomineralizationprocess which constituted of hydroxyapatite(HA) nanocrystals orderly grown in intimate contactwith collagen fibers. Bone morphogenetic protein 2 (BMP2) is the most powerful osteogenic factor.But it is extremely difficult to be manufactured in large scale. In previous study, we have designed anovel oligopeptide (P24) derived from BMP2 knuckle epitope and it contained abundantAsp(aspartic acid) and phosphorylated Ser(serine) which may be helpful for self-assamblybiomineralization and osteogenesis. Previous In vivo experiments have shown that this noveloligopeptide had excellent osteoinductive and ectopic bone formation property which was similar tothat of BMP2. In this study, PLGA-(PEG-ASP)n scaffolds were modified with P24 and a newbiomimetic bone tissue engineering scaffold material with enhanced bioactivity was synthesized bya biologically inspired mineralization approach. Peptide P24 was introduced intoPLGA-(PEG-ASP)n scaffolds using cross-linkers. Then the P24 modified scaffolds and the simplePLGA-(PEG-ASP)n scaffolds were incubated in modified simulated body fluid (mSBF) for 10 days.Growth of HA nanocrystals on the materials was confirmed by observation SEM and measurementsEDS and XRD. SEM analysis demonstrated the well growth of bonelike HA nanocrystals on P24modified PLGA-(PEG-ASP)n scaffolds than that of the control scaffolds. The main component ofmineral of the P24 modified scaffolds was hydroxyapatite containing low crystalline nanocrystals,and the Ca/P ratio was nearly 1.60, similar to that of natural bone, while that of the control scaffoldswas 1.52. The introduction of peptide P24 into PLGA- (PEG- ASP)n copolymer provides abundantactive sites to mediate the nucleation and self- ssembling of HA nanocrystals in mSBF. the resultedpeptide P24 modified- HA/PLGA- (PEG- ASP)n composite shows some features of natural boneboth in main composition and and hierarchical microstructure. This biomimetic treatment providesa simple method for surface functionalization and subsequent biomineralization on biodegradablepolymer scaffolds for tissue engineering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.1261.pdf
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  • 15
    Electronic Resource
    Electronic Resource
    Effects of Different Antimony Dopants on ZnO-V〈sub〉2〈/sub〉O〈sub〉5〈/sub〉 Based Varistor Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 735-738 
    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: The effects of pre-synthesized V2O5/Sb2O3 compound, SbVO4 and Sb2O3 on the microstructureand electrical properties of ZnO-V2O5 based varistor ceramics have been studied. The general homogeneousmicrostructure and phase composition of the ceramics have not been influenced by the antimonydoping form changes, except for the gradual decrease in average grain size and the increase in spinelformation within the ceramics. The ultimate cause of micro-structural variations with the antimonydoping form changes seems to have been the gradual increase in Sb3+ concentration within the ceramics.This change in micro-composition, together with the changes in microstructure, caused the electricalcharacteristics of the ceramics to vary. The pre-synthesized V2O5/Sb2O3 compound is the most effectiveantimony dopant in term of its effect on the ceramics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.735.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    Fine-Particle Lithium Iron Phosho-Olivine Synthesized by a Novel Modified Solid-State Reaction (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 524-525 
    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: In this paper, homogeneous and well-crystallized LiFePO4 was synthesized by a novelmodified solid-state reaction method following by heat treatment at relatively low temperature of 500°Cin Ar. No impurities are detected in the XRD patterns. The initial charge specific capacity and dischargespecific capacity reach 157.2mAhg-1 and 152.6mAhg-1 respectively at 20°C. Voltage plateaus at around3.45V were observed in all the curves, indicating that the charge and discharge reaction proceeds as atwo-phase reaction. The initial charge specific capacity is 157.2mAhg-1 at 0.1C rate, i.e. 92% of thetheoretical capacity, and specific capacity decreases slightly after 100 circles at room temperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.524.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    The Effect of Strain Rate on the Fracture Modes of Mg Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 1221-1226 
    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: Bending and impact tests were conducted on magnesium alloys AZ31 and AZ80 indifferent microstructure conditions. It is found that the strength parameters are increased quite a lot,and the ductility parameters (bending flection) decreased with increase in strain rate. The damagedsurface analysis in SEM revealed that, the micro crack nucleation modes, micro crack coalescenceand final crack path are varied with the stress state on the specimen, and the crack nucleation modesare varied with the initial strain rate. The effect of strain rate on fracture modes is discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.1221.pdf
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  • 18
    Electronic Resource
    Electronic Resource
    Low-Temperature Sintering and Dielectric Properties of (Zn〈sub〉1-x〈/sub〉Mg〈sub〉x〈/sub〉)TiO〈sub〉3〈/sub〉 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 2215-2218 
    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 dielectric ceramics comprised of (Zn1-xMgx)TiO3 (x=0.1~0.5, abbreviated to ZMT)were developed by conventional mixed-oxide method combined with a semi-chemical processing.V2O5 was used as sintering aids to lower the sintering temperature of ceramics. The results showedthat the hexagonal phase stability region extended from 900 to 1150°C as the amount of magnesiumincreased. The densification temperature of ZMT ceramics could be reduced from 1200 to 875°C byV2O5 additions and using semi-chemical processing, the relative density of ZMT ceramics with1.00wt% V2O5 addition reach 95% at 875°C. The dielectric properties of ZMT were measured atdifferent frequencies and the results showed that there existed a decreasing tendency of the losstangents (tg δ) with increasing measuring frequency. It is concluded that εr=22 and tg δ= 5.7×10-4 canbe obtained for ZMT ceramics at sintering temperature 875°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.2215.pdf
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  • 19
    Electronic Resource
    Electronic Resource
    A systematic study of polarizability and microscopic third-order optical nonlinearity in thiophene oligomers (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 5535-5541 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A systematic study of the dependence of the band gap, the linear optical susceptibility, the polarizability α, and the second hyperpolarizability γ, on the number of repeat unit is conducted for the thiophene series from monomer to hexamer. The linear optical susceptibilities for oligomers have been determined from the refractive index measurements on vacuum deposited films using the m lines technique. The orientationally averaged polarizabilities 〈α〉 have been measured from refractive index measurements of THF solutions. The orientationally averaged second hyperpolarizabilities 〈γ〉 have been measured by degenerate four-wave mixing studies of THF solutions. The validity of the Lorentz–Lorenz approximation is tested and found to be satisfactory. The experimental values of 〈α〉 and 〈γ〉 for thiophene and 〈α〉 for bithiophene are found to be in qualitative agreement with those obtained by a recent ab initio calculation which used the finite field method and included diffuse polarization functions. The experimentally observed dependence of 〈α〉 and 〈γ〉 on the number N of the thiophene repeat unit is compared with that predicted by a free electron model, PPP methods, and the ab initio calculations. For the case of polarizability, the repeat unit dependence is in good agreement with that predicted by the ab initio calculations but for the case of second hyperpolarizability, the agreement is not as good.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455560
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  • 20
    Electronic Resource
    Electronic Resource
    Ab initio and experimental quartic centrifugal distortion constants of acetone, pyrazole, and γ-pyrone (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 6698-6707 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The complete harmonic force field of acetone has been computed at the Hartree–Fock level with the 4–21 basis set of Gaussian orbitals. Seven scale factors optimized for related molecules were used to scale the computed force field. The mean deviation from the experimental vibrational frequencies is only 9.7 cm−1, except for the two methyl torsions. In order to obtain the best possible force field, a new set of seven scale factors was derived by fitting the computed spectrum of acetone to the observed spectrum. The only major change was for the C–C–C bending scaling factor. The final mean deviation was only 5.2 cm−1. The ground state rotational spectra of pyrazole and γ-pyrone have been reinvestigated in the millimeter-wave range. Thanks to millimeter-wave spectroscopy, accurate rotational and centrifugal distortion constants have been determined for acetone, pyrazole, and γ-pyrone. The experimental quartic centrifugal distortion constants are compared with the values calculated from ab initio force fields. A good agreement is found, even for the two-top molecule acetone for which the differences between the experimental and calculated T constants are smaller than 10%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460246
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