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  • 1
    Electronic Resource
    Electronic Resource
    Research on Residual Stress and Surfacial Morphology of Bio-Functionally Gradient HA-ZrO〈sub〉2〈/sub〉–Ti Coatings (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1301-1304 
    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 the present study, Functionally gradient HA-ZrO2-Ti coatings (FGC) on Ti6Al4V wereprepared by the plasma spraying process. The residual stress and surfacial morphology of coatingwere studied by X-ray diffraction and scanning electron microscopy with an energy dispersivespectroscopy. The results showed that: (1) the residual stress of FGC is 72.1Mpa, much lower thanthat of single HA coating, (2) The surfacial morphology of the FGC showed typical characteristics ofplasma-sprayed coating, no microcracks was observed because of its the thermal expansion matchedbetween the gradient coating and substrate
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1301.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Application of Acetate Starch to Colloidal In Situ Consolidation Molding Process of Alumina Ceramic (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 980-983 
    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 new consolidation in-situ forming process for high-performance alumina ceramic usingacetate starch was investigated. The pasting behavior and thermogelling properties of acetate starch andthe effects of different amount of acetate starch and solid loading on the rheologic behavior of the ceramicslip, as well as the linear shrinkage, density, strength and microstructure of the green body were discussed.The results indicate that acetate starch paste has good thermal stability and gelling ability. When thecontent of acetate starch is about 0.5%~1.5% (mass fraction), the apparent viscosity of alumina slurry,which is always less than 1Pa·s even for 58% (volume fraction) dense suspension, increased withincreasing the acetate starch content and solid loading. That results in easier to cast. Moreover, with theincreasing of solid loading the linear shrinkage and dry strength of green bodies decreased and the relativedensity increased. With the increasing starch content, the linear shrinkage rate and the density of the driedbody decreased, while the strength of the dried body almost linearly increased. The green body withhomogeneously-distributed density and pore size was also obtained in this work. It is concluded thatAl2O3 ceramics can be consolidation in-situ formed based on the gelling network of thermally swelledand gelatinized acetate starch
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.980.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Development of a New Injectable Calcium Phosphate Cement That Contains Modified Starch (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 843-846 
    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 study modified starch were used as anti-washout promoters of injectable calciumphosphate cement (CPC) and the effects of the modified starch on the injectability, anti-washoutperformance, setting time, compressive strength, phase evolution and microstructure of this cementwere investigated. The injectability of the cement was improved by adding the modified starch(0.5-2.0%). After mixing with modified starch (0.5-2.0%), the cement showed better anti-washoutperformance than that without modified starch after immersed and shaken in SBF. Especially, whenthe content of the modified starch was 1.0%, the remaining percentage of the cement was reached to92.6%, but only 5.9% of the CPC paste remained and set for the sample without modified starch aftershaken for 2 hrs. The compressive strength of cements significantly increased from 44 MPa to 54MPa when 0.5% of modified starch was added. And a slight increase on the mechanical strength canbe observed for other concentrations. Powder X-ray diffraction analysis revealed no significantdifference for the conversion of the cement to hydroxyapatite for any concentrations of modifiedstarches. The influence of the modified starch on the microstructure of the set cement was alsostudied. The results showed the modified starch would reduce the acicular crystal size ofhydroxyapatite accompanied with little flaky crystals generation and made a compact structure. It isconcluded that modified starch, a suitable anti-washout promoter, improved the performance of CPC
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.843.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure and Properties of A Calcium Phosphate Cement Tissue Engineering Scaffold Modified with Collagen and Chitosan (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 983-986 
    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 study, an ACP-DCPD based Calcium phosphate cement (CPC) scaffold with aporosity of 88% was prepared by using Na3PO4 as a poregen and then modified by collagen andchitosan. The results showed that collagen and chitosan obviously increased the compressivestrength. Cell culture showed that the cell can migrate, attach, proliferate and differentiate on thesurface of the materials and the pores walls. This CPC scaffold modified with collagen or chitosanwas a promising material to be used in bone 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.330-332.983.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Application of Multilayer Collagen/HA Scaffold in Cartilage Tissue Engineering (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1549-1552 
    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 article, a multilayer tissue engineering scaffold has been fabricated. The uppermost layeris consisted by the collagen and the downmost layer is consisted by the collagen/hydroxyapatide.Between the two layers, there have several continues changed collagen/HA layers at different ratio. Thesegradient scaffolds have been made by the freeze dried method. The morphology of the multiphasescaffold has been observed by the SEM. The chondrocytes from New Zealand rabbit knee joint wereseparated, harvested and cultured on the top layer of the scaffold. The histological and the immunohistochemicaltesting show that the chondrocytes keep its normal type in the 2 culture weeks
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1549.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Improvement of Anti-Washout Performance of Calcium Phosphate Cement Using Modified Starch (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1628-1631 
    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: Calcium phosphate cements (CPCs) are well-known orthopedic materials for filling bone.However, CPC pastes tend to disintegrate immediately when contacting with blood or other aqueous(body) fluids, which is a main limitation of its clinical applications in bone repairing, reconstruction andaugmentation. To improve the anti-washout performance of CPC, modified starches such aspre-gelatinized starch, etherified starch, and esterified starch were added to the liquid phase of CPC in thiswork. CPC with good anti-washout performance was prepared and the effects of the modified starches onthe properties of CPC were investigated. The results showed that the CPC with the modified starches weremore stable in simulated body fluid than that without modified starch, especially the CPC with theetherified starch (II). X-ray diffraction analysis revealed that the modified starches did not inhibit CPCcomponents from converting to hydroxyapatite. Furthermore, the anti-washout mechanism of themodified starches in CPC was discussed. It is concluded that the addition of the modified starches such aspre-gelatinized starch, etherified starch, and esterified starch to CPC can improve its anti-washoutperformance and should be of value in clinical surgery where the cement is exposed to blood
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1628.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Rheological Properties of an Injectable Calcium Phosphate Bone Cement and their Relationship with the Phase Evolution (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1658-1661 
    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: An injectable calcium phosphate bone cement was prepared by combining amorphous calciumphosphate (ACP) and dicalcium phosphate dihydrate (DCPD) for use in non-invasive surgery in this work.The effect of the conserving time on the viscosity, yield stress and injectability of the calcium phosphatecement (CPC) pastes were studied. The results showed that as the conserving time of the pastes prolonged,the viscosity and the yield stress of the pastes increased exponentially, and the injectability of the pastesdecreased. This resulted from the transformation of DCPD and ACP into hydroxyapatite via hydrationreaction. The results also indicated that the pastes still exhibited good injectability in even 15 min afterpreparation of the CPC pastes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1658.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    TEM Analysis on Bio-Functional Gradient Hydroxyapatite/ZrO〈sub〉2〈/sub〉 Coatings (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1676-1678 
    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 the present study, bioactive functional gradient coatings were prepared using net-energycontrolled plasma spraying technology. The microstructure and phases of the bioactive functional gradientcoating were examined by means of transmission electron microscope, scanning electron microscopyand X-ray diffraction. The results revealed that: (1) as-sprayed coatings contained a large amount ofamorphous phases and some nano-sized HA crystals formed during rapid solidification, (2) surface of thecoating was very rough with different-sized micropores, and the gradient layer was much denser whichfirmly bonded to the substrate without gaps and obvious interface between the coating and the substrate
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1676.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Filtering Impacts of an Introduced Bivalve (Dreissena polymorpha) in a Shallow Lake: Application of a Hydrodynamic Model (1999)
    Springer
    Ecosystems 2 (1999), S. 338-350 
    Details
    ISSN: 1435-0629
    Keywords: Key words: zebra mussel; benthic–pelagic coupling; Great Lakes; hydrodynamics; exotic species.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: ABSTRACT Nonindigenous species may exert strong effects on ecosystem structure and function. The zebra mussel (Dreissena polymorpha) has been attributed with profound changes in invaded ecosystems across eastern North America. We explored vertical profiles of water flow velocity and chlorophyll a concentration in western Lake Erie, over rocky substrates encrusted with Dreissena, to assess the extent to which mussels influence coupling between benthic and pelagic regions of the lake. Flow velocity was always low at surveyed sites (less than or equal to 2.9 cm s-1) and declined in direct proximity to the lakebed. Mean chlorophyll a concentration was also low (less than 5μg L-1) at all sites and depths. Chlorophyll a concentration was positively correlated with distance above lakebed and was lowest (0.3μg L-1) directly adjacent to the lakebed. Spatial patterns of zooplankton grazers could not explain observed vertical gradients in chlorophyll concentration. Hydrodynamic modeling revealed that filtering effects of Dreissena in a nonstratified, shallow basin depend mainly on upstream chlorophyll concentration, intensity of turbulent diffusion, feeding efficiency of the mussel colony, and the distance downstream from the leading edge of the mussel colony. In contrast to widespread perceptions that molluscs reduce phytoplankton concentration only adjacent to the lakebed, modeling scenarios indicated that depletion occurs throughout the water column. Depletion was, however, inversely proportional to distance above the lakebed. Simulation results are consistent with field-based observations made in shallow water habitats populated by large Dreissena populations in the Great Lakes and elsewhere. Results from this study indicate that zebra mussels strongly enhance coupling between pelagic and benthic regions in shallow lakes. Enhanced coupling between these regions explains, in part, high population densities of Dreissena and of many benthic invertebrates in ecosystems invaded by zebra mussels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100219900084
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  • 10
    Electronic Resource
    Electronic Resource
    Fabrication, Microstructure and Mechanical Properties of In Situ Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Platelets Reinforced Ce-TZP Composites (2002)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 224-226 (June 2002), p. 341-346 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/46/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.224-226.341.pdf
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