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  • 11
    Electronic Resource
    Electronic Resource
    Biocompatibility and Osteogenesis of Calcium Phosphate Cement Scaffolds for Bone Tissue Engineering (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 1383-1386 
    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: Porous calcium phosphate cement (CPC) scaffolds were successfully fabricated utilizingparticle-leaching method. Mesenchymal stem cells (MSCs) were cultured, expanded and seeded onthe scaffolds and the proliferation and differentiation of MSCs into osteoblastic phenotype weredetermined using MTT assay, ALP activity and ESEM. The results revealed that the CPC scaffoldswere biocompatible and had no negative effects on the MSCs in vitro. The in vivo biocompatibilityand osteogenicity of the scaffolds were investigated. Both pure scaffolds and MSCs/scaffoldconstructs were implanted in rabbit mandibles and studied histologically. The results showed thatCPC scaffolds exhibited good biocompatibility and osteoconductivity. Moreover, the introduction ofMSCs into the scaffolds dramatically enhanced the efficiency of new bone formation initially
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.1383.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    The Design and Analysis of Equilibrium Machine for Brake Dish Based on Virtual Kind Machine Technique (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 392-394 (Oct. 2008), p. 826-831 
    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 balance of brake dish is very important for a car driving. Taking one kind ofauto-equilibrium-machine of brake dish as research object, and making use of theVirtual–kind-machine technique and the ADAMS software as analysis tools, as well as with theSolid Works to set up a model, for a whole, the kinematics and dynamics of the product areanalyzed in various virtual environment, the research of dynamics simulation of machine system iscarried out, and various design projects are analyzed Quickly, the experiment is done, which is quitedifficult to be realized by physical kind machine, after all these, an optimal design project of thesystem is decided. The virtual kind machine technique is applied through whole design process,thus the design of the product development becomes convenient, the development period isshortened, and the product costs are reduced so that optimal-new product can be acquired
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.392-394.826.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    Ohmic Contacts on p-Type SiC Using Al/C Films (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 527-529 (Oct. 2006), p. 899-902 
    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: Al based alloys, such as Ti/Al, are commonly used for ohmic contacts on p-type SiC.The interfacial structures of a metal alloy film on SiC are very complicated after annealing. Al isconsidered as the key element responsible for forming ohmic contacts on p-type SiC, and reactswith C from SiC and forms Al4C3 and Si during annealing. In this study, we have investigatedohmic contact formation of a single component Al4C3 film on p-type SiC. Based on thestoichiometric formation of Al4C3 between Al and C at high temperatures, several samples withvarious Al/C mole ratios have been examined for ohmic contact formation after different annealingtemperatures. Carbon rich and stoichiometric Al4C3 films form ohmic contacts on p-type 4H-SiC(~2.8 x1018 cm-3 ) after annealing at 800 and 900°C. X-ray diffraction (XRD) data have shown that asingle component Al4C3 is formed when an ohmic contact on p-type SiC is activated. Al/SiC, as thecontrol sample, does not form ohmic contacts under the same conditions. This study reveals thatAl4C3 can be responsible for forming ohmic contacts on p-type SiC. However, its chemicalinstability requires that the secondary metal is necessary to form stable ohmic contacts when Albasedfilms are used
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.527-529.899.pdf
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  • 14
    Electronic Resource
    Electronic Resource
    Study on In Situ Synthesized Titanium Matrix Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 751-756 
    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: In the present work, titanium matrix composites reinforced with TiB, TiC, and Re2O3(Nd2O3 or Y2O3) were fabricated via common casting and hot-forging technology utilizing thechemical reaction between Ti, B4C (or C), rare earth (Re) and B2O3through homogeneously meltingin a non-consumable vacuum arc remelting furnace. In this work, Nd and Y were chosen as rare earth(Re) added in the in situ reaction. The thermodynamics of in situ synthesis reactions was studied. Theresults of X-ray diffraction (XRD) proved that no other phases appeared except for TiB, TiC andRe2O3. The microstructures of the composites were examined by optical microscopy (OM). Theresults showed that there were mainly three kinds of reinforcements: TiB whiskers, TiC particles andRe2O3particles. The reinforcements were fine and were homogeneously distributed in the matrix. Theinterfaces of TiB-Ti and Y2O3-Ti have been examined by high-resolution transmission electronmicroscopy (HREM).Transmission electron microscopy (TEM) and selected area diffraction (SAD)were used to analyze the orientation relationships of TiB-Ti, Nd2O3-Ti, and Y2O3-Ti. The mechanicalproperties at room temperature improved with the addition of TiB whiskers and TiC particlesalthough some reduction in ductility was observed. The (TiB+TiC)/Ti6242 composite withTiB:TiC=1:1 shows higher tensile strength and ductility
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.751.pdf
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  • 15
    Electronic Resource
    Electronic Resource
    Overview of Key R&D Activities for the Development of High-Performance Magnesium Materials in Canada (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 21-24 
    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: Canadian researchers are actively engaged in the development of novel cast, wrought and composite materials that are based on Mg. An overview is provided of Canadian research projects for new applications of Mg alloys that are targeted to the growing needs of the automotive sector. The research work described is funded primarily through two federal programs: the Canadian Lightweight Materials Research Initiative, and the Materials and Manufacturing Theme of the AUTO21 Network of Centres of Excellence. It includes work on mechanical and corrosionperformance of high-pressure die castings, gravity and low pressure castings using permanent and sand molds, sheet Mg development and magnesium matrix composites. The metallurgical research facilities at the CANMET Materials Technology Laboratory are featured
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.21.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    Biomimic Tubulose Scaffolds with Multilayer Prepared by Electrospinning for Tissue Engineering (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 882-885 
    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: Electrospinning represents an attractive approach for polymer processing. In the present study, gelatin and poly (propylene carbonate)(PPC) were electrospun successfully and collected on a rotating mandrel to form tubulose scaffolds. Furthermore, to mimic the real structure of animal blood vessels, the polymers were employed in a single tube as distinct layers by the technique of alternateelectrospinning. Scanning electronic microscopy (SEM) was used to analyze the morphology and diameter of the fibers, and the porosity of the scaffold. The tubes were seeded with rat bone marrow derived mesenchymal stem cells (BMSCs) and cultured for 2 weeks to evaluate their biocompatibility. The growth and distribution of the cells were observed directly under the fluorescent microscope. The interaction between cells and scaffold was analyzed by SEM and H&Estaining. After two weeks culture, the fibers were almost embedded by growing BMSCs. H&E staining and green fluorescent image showed that BMSCs uniformly grew inside the scaffolds. The results showed that electrospun tubes with uniform pores and fibers of smaller diameter were appropriate for BMSCs attachment and proliferation. These primary data indicated that scaffolds fabricated by ectrospinning are structurally biocompatible. The PPC scaffolds may be useful in vascular tissue engineering if they were further modified chemically or with appropriate therapeutic molecules
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.882.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    Ni Graphite Intercalated Compounds in Ohmic Contact Formation on SiC (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 527-529 (Oct. 2006), p. 863-866 
    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: Ohmic contacts on SiC have been investigated extensively in the past decade. However,the mechanism for ohmic contact formation has been a troublesome issue. The interfacial structuresat the atomic scale responsible for forming ohmic contacts have not been revealed. Our previousresults have shown that carbon can form ohmic contacts on SiC after thermal annealing, and that aninterfacial carbon layer between Ni and the SiC improves the contacts significantly. In this study,we have investigated the interactions between Ni and carbon, and ohmic contact formation on SiCusing x-ray diffraction (XRD) and Raman spectroscopy. After annealing, ohmic behavior wasobserved and Ni graphite intercalated compounds (GICs) were found on Ni/C/SiC structures.Unlike conventional graphite intercalated compounds, the Ni atoms substitute for carbon atoms inthe graphitic networks in these Ni-GICs. XRD peaks at 21.6° due to the Ni graphitic intercalationcompound (Ni-GIC) and at 26.3° due to graphite have been observed. The distance betweengraphitic sheets is 0.403nm in the Ni graphite intercalated compounds, whereas it is ~20% larger inthe graphite. The thickness of the interfacial carbon layer does not affect the formation of Ni-GIC
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.527-529.863.pdf
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  • 18
    Electronic Resource
    Electronic Resource
    Infrared Reflectance Study of 3C-SiC Grown on Si by Chemical Vapor Deposition (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 527-529 (Oct. 2006), p. 695-698 
    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: We have performed a combined investigation of experiment and theory on the infraredreflectance from cubic SiC grown on Si by chemical vapor deposition. A damping behavior of theinterference fringes away from the reststrahlen band and a dip or notch within the “flat top” areobserved from some samples while they does not occur in high quality 3C-SiC/Si samples. Theformer is interpreted due to an interfacial transition layer existed between SiC-Si and a rough surface,while the latter can be demonstrated by a three-component effective medium model
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.527-529.695.pdf
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  • 19
    Electronic Resource
    Electronic Resource
    Role of Oxygen in Growth of Carbon Nanotubes on SiC (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 527-529 (Oct. 2006), p. 1575-1578 
    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: Carbon nanotubes (CNTs) grown on SiC are metal-free, well-aligned, and with lowstructural defects. In this study, CNT formation on SiC is examined in high vacuum (10-5torr) andultra-high vacuum (10-8torr). Multi-wall carbon nanotubes and graphitic structures are the mainproducts on the SiC surface at 1400-1800°C in 10-5torr. Under ultra-high vacuum, thedecomposition rate of SiC is much lower than in high vacuum, indicating that SiC is decomposedby oxidation reaction. Using X-ray photoelectron spectroscopy (XPS), the intensity of the O1s peakat 530.3 eV decreases with increasing take-off angle, indicating that this oxygen species exists onthe walls of CNTs. The results show that oxygen with a low pressure not only oxidizes SiC, butalso forms a highly thermally stable carbon-oxygen compound, and interacts with the CNTs at hightemperatures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.527-529.1575.pdf
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  • 20
    Electronic Resource
    Electronic Resource
    Structural and Electrical Characteristics of Carbon Nanotubes Formed on Silicon Carbide Substrates by Surface Decomposition (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 527-529 (Oct. 2006), p. 1579-1582 
    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: Aligned carbon nanotubes (CNT’s) are formed on the surface of silicon carbide (SiC)wafers during high temperature anneals. The exposed 4H SiC surface transforms into CNT’s fortemperatures in the range of 1400-1700°C and under moderate vacuum conditions (10-2– 10-5torr).The rate of formation on the C-face (0001,‾) is about three times the rate on the Si-face (0001), butboth rates increase with anneal temperature. SEM, TEM and Raman scattering measurements haveconfirmed the presence of both single-wall and multi-wall CNT’s. The carbon source is believed tobe residual carbon from the SiC left on the surface after preferential evaporation of Si. CNTformation is believed to be catalyzed by low concentrations of residual oxygen in the chamber.Subsequent I-V measurements provide insight into the electrical characteristics of the CNT’s andthe SiC/CNT interface
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.527-529.1579.pdf
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