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  • 2005-2009  (11)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Bone Regeneration with β-TCP/PLGC Membranes (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 49 (Oct. 2006), p. 258-262 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: In the treatment based on Guided Bone Regeneration method (GBR), membranes arenecessary to cover bone defects and prevent the invasion of surrounding soft tissues. In spite of thepotential usefulness of GBR method, no appropriate materials for the membrane have beendeveloped and this method is not utilized frequently in common clinical practice. Here wedeveloped materials such as a composite of β-tricalcium phosphate (β-TCP) and copolymer ofL-lactide, glycolide and ε-caplolactone (PLGC), and designed the novel GBR membranes with idealmechanical properties. The materials had good biocompatibility, and the membrane had sufficientstrength although their thickness was as thin as 200 μm. The membranes were applied to large bonedefects created in canine mandibular bones, and significant enhancement in bone regeneration wasdemonstrated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.49.258.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Net-Shape Manufacturing of Micro Porous Metal Components by Powder Injection Molding (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 981-984 
    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: A novel production method for porous metal components has been developed byapplying powder space holder (PSH) method to metal powder injection molding (MIM) process.The PSH-MIM method has an industrial competitive advantage that is capable of net-shapemanufacturing the micro-sized porous metal products with complicated shapes and controlledporosity and pore size. In this study, the small impeller with homogeneous micro-porous structurewas manufactured by the PSH-MIM method using porous compounds composed of fine stainlesssteel 316L powder and polymethylmethacrylate (PMMA) particle. The effects of combinations insize and fraction of PMMA particle on dimensional tolerance and variation of sintered porousspecimens were investigated. It was concluded that the PSH-MIM method could manufacturecommercially micro-porous metal components with high dimensional accuracy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.981.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    High Temperature Deformation Behavior and Microstructure Change in Nano Grain Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 745-750 
    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: One of the authors proposed a non-equilibrium powder metallurgy process, whichenables the fabrication of a near net-shape product using TiC and TiN/Silicide ceramic composites.The PM process in combination with mechanical alloying (MA) and Spark Plasma Sintering (SPS)are applied to produce nano-grain composite, TiC/Ti5Si3. Powders of elements Ti and SiC whosecomposition is Ti-20 mass%SiC are blended for MA. After the alloying, the MA powder whoseaverage particle size is 20~30 μm, has amorphous-like structures, and then the MA powder iscompacted by SPS. Results of compression-tests indicate the occurrence of unusual hightemperaturedeformation behaviors such as low flow stress at the lower deformation temperature orat the high initial strain rates were observed in the SPS compacts. TEM observations of thedeformed compacts after the compression-tests indicate the microstructure has no-strain equiaxial -grains and clear boundaries. This serves as proof of a superplasticity deformation. In addtion, theresults of the XRD analysis of the compressed-compacts show that new phases are formed duringthe compression-test. Therefore, the above deformation is attributed to a "pseudo" superplasticity inwhich the phase transition of metastable microstructure occurs during the deformation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.745.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Micro Metal Injection Molding Process for High Performance Titanium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 3667-3672 
    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 this study, gas nitriding was processed for various sizes of Ti specimens which wereproduced by metal injection molding (MIM) process, for the sake of enabling the high functionality atlow processing cost. It was shown by the nitriding treatment that the hardness of the surface increasedextremely and the microstructure changed to the TiN and acicular α-Ti phase. With respect to theeffect of the nitriding on the size of parts, micro dumbbell specimen had around five times highercontent of nitrogen than the block ones. It was suggested that the size of μ-MIM products is so smallthat the surface treatment can contribute significantly to improve the properties, and then gas nitridingprocess may be one of effective surface treatment methods for high functionality of μ-MIM Tiproducts
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3667.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Porous Graded Materials by Stacked Metal Powder Hot-Press Moulding (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 492-493 (Aug. 2005), p. 765-770 
    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 production method for metal components with micro sized porous structure has been developed by applying “powder space holder method” to metal powder injection molding process. In this study, a co-sintering process was utilized to make a plate of sintered metal with micro porous graded structure. The green compact sheets with various contents of space hold particles were prepared by hot press molding for simplification. The five layers of metal with symmetric structure, which the skin layer was formed with high density metal and the core was formed with open or closed porous structure, or with inverse symmetry, was obtained by changing stacking sequence in co-sintering process. Mechanical properties of the materials with plain homogeneous porous structure and porous graded structure were compared. The usefulness of proposed method for producing the metal components with micro porous graded structure and the effective of graded structure tocompensate the deficiencies on the mechanical property of porous metals was shown
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.492-493.765.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Gas Nitriding Mechanism in Titanium Powder Injection Molded Products (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 361-364 
    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: Gas surface treatment is considered to be especially effective for Titanium because of itshigh reactivity. In this study, we investigated the gas nitriding mechanism in titanium sintered partsproduced by metal powder injection molding (MIM) process. In MIM process, gas nitriding can besurface-treated subsequently after debinding and sintering process. Then, the microstructure andnitrogen content of sintered MIM parts are considered to be greatly influenced by not only nitridingconditions but also sintered conditions. In this study, the effects of sintering time on microstructuresuch as nitrided layer thickness and hardness was investigated. Focus was given to the effects ofspecimen size on nitriding process, because the size of micro metal injection molding (μ-MIM)product is so small and the specific surface of that product is so large that the mechanical andfunctional properties can be subject to change by nitriding
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.361.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Innovations in Micro Metal Injection Molding Process by Lost Form Technology (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 369-372 
    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 production method of micro sacrificial plastic mold insert metal injection molding,namely μ-SPiMIM process has been proposed to solve specific problems involving theminiaturization of MIM. The sacrificial plastic mold (SP-mold) with fine structures was prepared byinjection-molding polymethylmethacrylate (PMMA) into Ni-electroform, which is a typical LIGA(Lithographie-Galvanoformung-Abformung) process. Stainless steel 316L feedstock was injectionmoldedinto the SP-mold which had micro structures with multi-pillars. The green compact wasdemolded as one component with the SP-mold, which was decomposed along with binderconstituent of feedstock in debinding process. This study focused on the effects of metal particlesize and processing conditions on the shrinkage, transcription and surface roughness of sinteredparts, which were evaluated by SEM (Scanning Electron Microscope) observation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.369.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Micro Metal Injection Molding Using Hybrid Micro/Nano Powders (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 381-384 
    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 study aims to investigate the effects of hybrid micro/nano powders in a micro metalinjection molding (μ-MIM) process. A novel type of mixing-injection molding machine was used toproduce tiny specimens (〈1mm in size) with high trial efficiency using a small amount of feedstock(〈0.05cm3 in volume). Small dumbbell specimens were produced using various feedstocks preparedby changing binder content and fraction of nano-scale Cu powder (130nm in particle size). Theeffects of adding the fraction of nano-scale Cu powder on the melt viscosity of the feedstock,microstructure, density and tensile strength of sintered parts were discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.381.pdf
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  • 9
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    Foliar trichome- and aquaporin-aided water uptake in a drought-resistant epiphyte Tillandsia ionantha Planchon (2007)
    Springer
    Details
    Publication Date: 2007-08-03
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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  • 10
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    Large-scale collection and annotation of full-length enriched cDNAs from a model halophyte, Thellungiella halophila (2008)
    BioMed Central
    Details
    Publication Date: 2008-11-12
    Description: Background Thellungiella halophila (also known as Thellungiella salsuginea) is a model halophyte with a small plant size, short life cycle, and small genome. It easily undergoes genetic transformation by the floral dipping method used with its close relative, Arabidopsis thaliana. Thellungiella genes exhibit high sequence identity (approximately 90% at the cDNA level) with Arabidopsis genes. Furthermore, Thellungiella not only shows tolerance to extreme salinity stress, but also to chilling, freezing, and ozone stress, supporting the use of Thellungiella as a good genomic resource in studies of abiotic stress tolerance. Results We constructed a full-length enriched Thellungiella (Shan Dong ecotype) cDNA library from various tissues and whole plants subjected to environmental stresses, including high salinity, chilling, freezing, and abscisic acid treatment. We randomly selected about 20 000 clones and sequenced them from both ends to obtain a total of 35 171 sequences. CAP3 software was used to assemble the sequences and cluster them into 9569 nonredundant cDNA groups. We named these cDNAs "RTFL" (RIKEN Thellungiella Full-Length) cDNAs. Information on functional domains and Gene Ontology (GO) terms for the RTFL cDNAs were obtained using InterPro. The 8289 genes assigned to InterPro IDs were classified according to the GO terms using Plant GO Slim. Categorical comparison between the whole Arabidopsis genome and Thellungiella genes showing low identity to Arabidopsis genes revealed that the population of Thellungiella transport genes is approximately 1.5 times the size of the corresponding Arabidopsis genes. This suggests that these genes regulate a unique ion transportation system in Thellungiella. Conclusion As the number of Thellungiella halophila (Thellungiella salsuginea) expressed sequence tags (ESTs) was 9388 in July 2008, the number of ESTs has increased to approximately four times the original value as a result of this effort. Our sequences will thus contribute to correct future annotation of the Thellungiella genome sequence. The full-length enriched cDNA clones will enable the construction of overexpressing mutant plants by introduction of the cDNAs driven by a constitutive promoter, the complementation of Thellungiella mutants, and the determination of promoter regions in the Thellungiella genome.
    Electronic ISSN: 1471-2229
    Topics: Biology
    Published by BioMed Central
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