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  • 11
    Electronic Resource
    Electronic Resource
    Influence of Two-Step Sintering Variables on Phase Stability of Hydrothermally Prepared HAp Nano Powders (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 91-94 
    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: Two-step sintering was performed to prepare hydroxyapatite (HAp) with a high densityand a fine microstructure utilizing hydrothermally synthesized nano powders. Its effectiveness wasdependent on starting chemicals for precursors of HAp, powder processing condition, initialtemperature in the two-step sintering, heating rate to the initial temperature, and holding time atfinal temperature. HAp powder, hydrothermally treated after aging of precipitate of Ca(OH)2 andH3PO4 for 48 h, led to HAp having a high phase stability at elevated temperatures, a high density,and a fine microstructure after two-step sintering with heating rate of 10°C/min to 1275°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.91.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    In Vitro Bond Strength of Based-Coated Zirconia Brackets for Orthodontics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 857-860 
    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 Vitro Bond strength of base-coated (Y, Fe)-TZPs (yttria and iron co-doped tetragonalzirconia polycrystals) were investigated to evaluate the feasibility for the ceramic bracket applications.Pre-sintered (Y,Fe)-TZP brackets were machined, abraded and spray-coated with granule slurriescontaining 10~50 wt% of flux. Better adhesion to the base surface of the brackets was observed byraising the amount of flux in the slurries. It may be because of the fusion and the collapse of thegranules as a result of the high amount of flux. The one-way analysis of variance indicated that therewere significant differences in bond strength measurements between the experimental groups except30% and 50% flux content groups. The Weibull distribution revealed that 50% flux content group isthe best with a high characteristic strength value. Mean ARI values exhibited large differences andranged from 1.6 for 50% flux content group to 3.0 for non-coated group. Adhesive remnant ofadhesive resin was decreased by increasing the flux up to 50%. Reduction in adhesive remnant islikely due to the higher bonding of adhesive resin to granules. No teeth and bracket damages werefound in any teeth de-bonded by shear force. The base-coated brackets with higher strength (11.5MPa) and no adhesive remnant were newly proposed for the orthodontics applications
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.857.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    A New Control Algorithm for Impressed Current Cathodic Protection on the Underwater Hull (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 125-128 
    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: Cathodic protection is a system of preventing corrosion by forcing all surfaces of a hull to be cathode by providing external anodes. A metal can be made cathodic by electrically connecting it to a more anodic metal within the electrolyte. Anodes of these metals corrodepreferentially, the corrosion current of the anode achieving cathodic protection of the underwater hull to which they are connected. This paper presents a new current control algorithm for ICCP (Impressed Current Cathodic Protection) system. The anode of ICCP system is controlled by an external DC source with converter. The function of anode is to conduct the protective current into seawater. The DC source is generally obtained from main power system that contains a transformer, converter and etc. The proposed algorithm can operate AC-DC converter with current link. This algorithm includes the harmonic suppression control strategy and the optimum protection strategy and has tried to test therequirement current density for protection, the influence of voltage, the protection potential. Also, the properties of ICCP protected hull of ship in seawater are evaluated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.125.pdf
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  • 14
    Electronic Resource
    Electronic Resource
    Spectroscopic Analysis of Plasma Induced in Laser Welding of Aluminum Alloys (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 429-432 
    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: This paper describes the features and characteristics of plasma induced in the pulsed YAG laser welding of Al-Mg alloys in air and argon atmospheres. In the air environment, the identified spectra are atomic lines of Al, Mg, Cr, Mn, Fe and Zn, and singly ionized Mg line, as well as strong molecular spectrum of AlO, MgO and AlH. It has been confirmed that the resonant lines of Al and Mg were strongly self-absorbed. These facts have shown that the laser-induced plasma is relatively a low temperature and high density metallic vapor. The intensities of molecular spectra ofAlO and MgO are different each other depending on the power density of laser beam. Under the low power density irradiation condition, the MgO band spectrum is predominant in intensity, while the AlO spectrum became much stronger with the increase in high power density. This was attributed by the great difference in boiling point and vaporization energy of Al and Mg. In argon atmosphere the band spectra of MgO and AlO completely vanished, but AlH molecular spectra is detected clearly. The hydrogen source is presumably the hydrogen solved in the base metal,absorbed water on the surface oxide layer, or H〈sub〉2〈/sub〉 and H〈sub〉2〈/sub〉O in the shielding gas
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.429.pdf
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  • 15
    Electronic Resource
    Electronic Resource
    Deformation Behavior of Ni-Based Metallic Glass Matrix Composites Reinforced by Brass Short-Fibers Synthesized by Warm Extrusion of Powders (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 937-940 
    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: Deformation behavior of Ni-based metallic glass matrix composites reinforced byshort brass-fibers, synthesized by warm extrusion of gas atomized powders, has been investigated under the uniaxial compression condition at room temperature. The brass-fibers are well distributed in the metallic glass matrix and enhanced macroscopic plasticity is observed due to the formation of multiple shear bands, initiated from the interface between brass-fiber and metallic glass matrix, as well as their confinement between the brass-fibers, stemming from the constrained plastic deformation of the reinforcing brass phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.937.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    Comparison of Bone Formation in Rabbits Using Hydroxyapatite and β-Tricalcium Phosphate Scaffolds Fabricated From Egg Shells (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 999-1002 
    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/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.999.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    Electrically Controllable Biomimetic Actuators Made with Multiwalled Carbon Nanotube(MWNT) Loaded Ionomeric Nanocomposites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 733-736 
    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: Biomimetic actuators that can produce soft-actuation but large force generation capability are of interest. Nafion, an effective ionomeric material from DuPont, has been shown to produce large deformation under low electric fields (〈10V/mm). This response is caused by a direct electro-osmotic effect due to the existence and mobility of cations and subsequent swelling and deswelling of the material. In this effort, multiwalled carbon nanotube (MWNT)/Nafion nanocomposites were prepared by a casting in order to investigate the effect of MWNT loading in the range of 0 to 7 wt% on electromechanical properties of the MWNT/Nafion nanocomposites. The measured elastic modulus and actuation force of the MWNT/Nafion nanocomposites are drastically different, showing larger elastic modulus and improved electromechanical coupling, from the one without MWNT, implying that the effective MWNT loading is crucial to develop high-performance biomimetic actuators
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.733.pdf
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  • 18
    Electronic Resource
    Electronic Resource
    All-Ceramic Fixed Partial Denture Cores Prepared Using Water-Based Alumina Tapes (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 929-932 
    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: Aqueous-based alumina tape, prepared using acrylate emulsion binder, was employed to form 3-unit all-ceramic anterior fixed partial denture core structures. Formability, linear shrinkage, and strength of the tape were optimized by adjusting tape composition to a/(a+b+p)=0.84 and b/(b+p)=0.5. Marginal fitness of the core framework was acceptable for clinical applications when more than two points on lingual side of core structure were placed to touch a plate during sintering.The 3-unit all-ceramic anterior fixed partial denture utilized ceramic tape has functioned successfully for 3 years without any loss of structural integrity and esthetics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.929.pdf
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  • 19
    Electronic Resource
    Electronic Resource
    Wear Behaviors of UHMWPE against LTD-Free Zirconia/Alumina Composites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 1011-1014 
    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 sliding wear behavior of ultra high molecular weight polyethylene (UHMWPE)was examined on four different compositions of novel low temperature degradation-free zirconia/alumina (Z/A) composite material used for a femoral head in total hip joint replacement. The wear of UHMWPE pins against these Z/A composite disks were evaluated by performing the linear reciprocal sliding and repeat pass rotational sliding tests for one million cycles in a bovine serum. The novel low temperature degradation (LTD)-free tetragonal zirconia polycrystal (TZP)/aluminacomposite (90(5.3Y, 4.6Nb)-TZP/10Al2O3) induced the less wear amount of UHMWPE than the other Z/A composites. Linear reciprocal motion wore more the UHMWPE pin than did repeat pass rotational motion for all disk materials. It was observed that few transfer film on the sliding track of Z/A composite disks and the matching contact surfaces of pins had relatively less scratch. Getting rid of transfer film, there is no change of surface roughness on the sliding track of Z/Acomposite disks. This novel Z/A composite (90(5.3Y, 4.6Nb)-TZP/10 Al2O3) demonstrates the potential as an alternative material for the femoral head in total hip replacement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.1011.pdf
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  • 20
    Electronic Resource
    Electronic Resource
    Biocompatibility of Calcium Phosphate Ceramics Synthesized from Eggshell (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 23-26 
    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 was the HA and β-TCP powers were synthesized by a new wetchemicalmethod using eggshell and phosphoric acid. The biocompatibility of synthesized naturalHA, HA/β-TCP(50:50) and β-TCP derived from eggshell was compared with those of ascommercial chemical powder with mesenchymal stem cells derived from human bone marrow.Development of crystalline phases of the mixtures was studied as functions of mixing ratio andtemperature using X-ray diffractometer. The morphological characteristics of the calcinedeggshell and synthesized powders were examined by scaning electron microscopy. The in-vitrocytotoxicity and cell attachment of sintered disks were examined using human bone marrowderivedmultipotent stem cells(hBMSCs). Cell response was characterized by MTT assay ,Alkaline phosphatase stain and RT-PCR analysis. Pure HA was synthesized in the mixing ratio of1:1.1 wt% at 900℃ for 1h. the crystallization of HA was started at 800℃ in the 1:1.1 mixingratio, ant the HA phase was continued up to the high temperatures. In the ratio of 1:1.3 and1:1.5 wt%, β-TCP was effectively synthesized at 900℃. In the 1:1.5 ratio, β-TCP phase wasdetected at 700℃, and complete crystallized β-TCP was observed above 900℃. At the highertemperature than 1000℃, the β-TCP was gradually decreased and α-TCP was observed. The HAand β-TCP disk does not exert cytotoxic effect on the hBMSCs undergoing osteoblasticdifferentiation. In addition, the hBMSCs are adhered on the surface of synthesized natural HAand β-TCP disk as successfully as on the culture plate or as commercial chemical HA and β-TCPdisk. The hBMSCs adhered on either synthesized natural HA, β-TCP or as commercial chemicalHA, β-TCP disk displays undistinguishable actin arrangement and cellular phenotypes, indicatingthat synthesized natural HA, β-TCP does not disrupt normal cellular responses. Analysis ofdifferentiation of the hBMSCs cultured on culture plate, synthesized natural HA, β-TCP and ascommercial chemichal HA, β-TCP disk shows that three matrices are able to support osteoblasticdifferentiation of the hBMSCs as accessed by alkaline phosphatase staining
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.23.pdf
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