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  • 1
    Electronic Resource
    Electronic Resource
    The Influences of Size and Anisotropy Strength on Hysteresis Scaling for Anisotropy Heisenberg Multilayer Films (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1085-1088 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In this paper, we simulate the magnetization dynamic processes of the multilayer films,and calculate their hysteresis loop areas using Monte Carlo method. The simulated results indicatethat, the size and anisotropy strength of the anisotropy multilayer films influence evidently thedynamic phase transition, and the phase transition temperature increases with enhancing values ofthe anisotropy constant and layer thickness. It is also found that, with increasing number of layers offilms, the value of α decreases, while the magnitudes of β and γ increase. On the contrary, withincreasing anisotropy strength, the value of α increases, while the magnitudes of β and γ reduce
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.1085.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Juvenile versus adult competition (1991)
    Springer
    Journal of mathematical biology 29 (1991), S. 457-473 
    Details
    ISSN: 1432-1416
    Keywords: Intraspecific competition ; Age-structure ; Stability ; Resilience ; Destabilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract A general class of age-structured models based upon the McKendrick/von Foerster equations are used to study intraspecific competition between juveniles and adults. Criteria for the existence and stability of equilibria are obtained and the dependence of equilibrium stability (i.e. equilibrium resilience) on competition coefficients is analyzed for low inherent net reproductive numbers. The results are applied to the question of whether juvenile vs. adult intraspecific competition is stabilizing or destabilizing. Two types of competition are studied. The first, involving suppressed adult fertility due to competition from juveniles, was found to be destabilizing in that equilibrium levels are lowered and equilibrium resilience weakened by increased competition. The second, involving increased juvenile mortality due to competition from adults, was found to be considerably more complicated. While equilibrium levels were again reduced by increased competition, equilibrium resilience can either be weakened or strengthened. A criterion for determining the effects on resilience is derived and several examples are given to illustrate various possibilities in this case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160472
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallinity and Thermal Decomposition of Dialdehyde Celluloses from Bacterial Cellulose (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1289-1292 
    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: A series of dialdehyde cellulose samples with varied aldehyde content were prepared byoxidation of bacterial cellulose with sodium periodate. The X-ray diffractometry profile showed thatthe crystallinity degree of bacterial cellulose was 66%, but that of the dialdehyde cellulose(containing 12% aldehyde ) was 56%. Thermal decomposition of these dialdehyde cellulose samplesand bacterial cellulose were studied by thermogravimetry. The decomposition of bacterial cellulosein nitrogen started at 230[removed info] and rapid weight loss occurred between 300-400[removed info]. The introduction ofdialdehyde group to bacterial cellulose resulted in significant shifts of decomposition to lowertemperature range. The decomposition of dialdehyde cellulose (12% aldehyde ) started at 180[removed info] andrapid weight loss between 200-350[removed info]. The temperature of rapidest weight loss shifted from 340[removed info] ofbacterial cellulose to 290[removed info] of the dialdehyde cellulose(12% aldehyde)
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1289.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Hydroxyapatite Nano-Particles Coating on the Pore Surface Within Poly(DL-lactic-co-glycolic acid) Scaffold (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 1237-1240 
    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: This paper describes a novel method for coating hydroxyapatite (HA, Ca10(PO4)6(OH)2)nano-particles onto poly(DL-lactic-co-glycolic acid) (PLGA) scaffold. Paraffin micro-spheres wereused as porogens to create porous scaffolds and as vehicles to transfer HA into PLGA scaffold. HAnano-particles / 50% ethanol suspension was mixed with paraffin micro-spheres. The paraffinmicro-spheres / HA suspension were pressed together to form a paraffin scaffold. After it was dried,the HA was coated on the surface of the paraffin spheres. Then, PLGA solution was cast into theinter space among the paraffin micro-spheres and then the solvent was evaporated. Afterwards, theparaffin micro-spheres were dissolved and removed. PLGA scaffolds with controlled pore size,good interconnectivity and high porosity were obtained. The HA nano-particles were transferredfrom the paraffin surface to the surface of the pore wall throughout the PLGA scaffold
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.1237.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Fabrication and Electrical Conductivity of a YSZ-NiCr Cermet (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 384-386 
    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: YSZ-NiCr powder was synthesized by gel-reduction process at 850°C for 2 h. YSZ-NiCrcermet was fabricated by hot-press sintering at 1350°C for 1 h. The powder has a mean particle size of 42nm and the sintered specimen has a fine and homogeneous microstructure with a mean crystalline size of0.2 &m. The conductivity has a tendency to decrease with increasing temperature. This behavior can beaccounted for that there are two conduction paths through the cermet, an electronic path through the Ni/Crmetal phase and an ionic path through the ZrO2-Y2O3 phase. The objective of this work is to give apossible improvement in the cermet anode of SOFC
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.384.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of Electric Pulse on Solidification Structure of KS282 Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 555-558 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.555.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Unidirectional Solidification Process of Turbine Blade Castings (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 947-952 
    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: A mathematical model for three-dimensional simulation of unidirectional solidificationprocess and microstructure evolution of Ni-based superalloy investment castings was developedbased on CA-FD method. The modified ray tracing method was used to solve the complicated heatradiation transfer among the multiple blades and outer space during withdrawal process. Variouswithdrawal rates were used. During one process high withdrawal rate was used first before theplatform approached the baffle. Then the low withdrawal rate was used to reduce the temperaturedifference of the platform in horizontal section and avoid the defects formed in the corner of theplatform. The experimental cooling curves of different positions in the blades and microstructurewere compared with the simulation results. Both the results showed that the various withdrawal ratesprocess was effective to reduce the temperature difference of the platform and avoid the formation ofstray grains. This process could be helpful to increase the productivity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.947.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Antibacterial and Nontoxic Nano Silver PLLA Composites for Tissue Engineering (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 849-852 
    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: Poly-L-Lactide (PLLA) composites were prepared with nano silver particles with theweight ratios of nano silver particles to PLLA (Ag/PLLA) at 0.5%, 2.5%, 5%, 7.5% and 10% (w/w).In vitro cytotoxicity tests were conducted firstly to evaluate the cytotoxicity of the composites. Theresults indicated that PLLA, 0.5%, 2.5% and 5% Ag/PLLA composites were nontoxic to cells,while 7.5% and 10% Ag/PLLA composites were significantly toxic to cells. Cell proliferationexperiments and antibacterial tests were also performed. 5% Ag/PLLA was found the best for cellproliferation with obvious antibacterial property. Thus, Ag/PLLA can be used as nontoxic scaffoldsfor tissue engineering with antibacterial property
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.849.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Fabrication of Poly(L-Latic Acid) Scaffolds with Wool Keratin for Osteoblast Cultivation (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 845-848 
    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: As a natural protein, wool keratin was used to improve the cell affinity of poly(L-lacticacid) (PLLA). Small keratin particles were prepared from keratin solution by the spray-dryingprocess. Keratin particles were blended with PLLA/1,4 dioxane solution and paraffin micro-sphereswhich were used as progens. After the mixture was molded and dried, the paraffin micro-sphereswere removed by cyclohexane. PLLA/keratin scaffolds with controlled pore size and wellinterconnectivity were fabricated. Keratin releasing rate was detected by Fourier transform infrared(FTIR) after the scaffold was immersed into PBS up to 4 weeks. The surface chemical structure wasexamined by X-ray photoelectron spectroscope (XPS). The results suggested that the keratin couldbe held into the scaffold which was expected to improve the interactions between osteoblasts andthe polymeric scaffolds
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.845.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Modeling of Unidirectional Growth in a Single Crystal Turbine Blade Casting (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 508 (Mar. 2006), p. 111-116 
    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: Single crystal superalloy turbine blade are widely used in aero-engineering. However, there are often grain defects occurring during the fabrication of blade by casting. It is important to study the formation of microstructure related defects in turbine blades. Single crystal blade sample castings of a nickel-base superalloy were produced at different withdrawal rates by the directional solidificationprocess and investment casting. There was a difference between the microstructure morphology at the top part of the turbine blade sample castings and the one at the bottom. Higher withdrawal rates led to more differences in the microstructure and a higher probability of crystallographic defect formation such as high angle boundaries at locations with an abrupt change of the transversal section area. To further investigate the formation of grain defects, a numerical simulation technique was used to predict the crystallographic defects occurring during directional solidification. The simulation results agreed with the experimental ones
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.508.111.pdf
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