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  • 1
    Electronic Resource
    Electronic Resource
    Genome-wide transcription analyses in rice using tiling microarrays (2006)
    [s.l.] : Nature Publishing Group
    Nature genetics 38 (2006), S. 124-129 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Sequencing and computational annotation revealed several features, including high gene numbers, unusual composition of the predicted genes and a large number of genes lacking homology to known genes, that distinguish the rice (Oryza sativa) genome from that of other fully sequenced model species. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/ng1704
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  • 2
    Electronic Resource
    Electronic Resource
    Study on High Performance Warm Compacted Fe-2Ni-2Cu-1Mo-1C Powder Metallurgy Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1621-1624 
    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: Warm compacting and sintering behaviors of pre-mixed Fe-2Ni-2Cu-1Mo-1C powderswere studied. Results showed that green density increased with compacting temperature and thenfell slightly; the maximum green density was obtained at about 120°C. Green compact density andspring back effect of the pre-mixed powder increased gradually as the compacting pressureincreased. Sintered density first increased and then fell as the temperatures went up under differentsintering temperatures for 50 minutes, but the trends of sintering dilatation were first reduced andthen increased. Sintered density first reduced and then increased with the prolonged sintering timeat 1300°C, but the trends of dimension change after sintering were the very reverse. Tensile strength,elongation and hardness of the warm compacted Fe-2Ni-2Cu-1Mo-1C materials generally increasedas sintering temperature and sintering time went up
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1621.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Nozzle Type and Abrasive on Machinablity in Micro Abrasive Air Jet Machining of Glass (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 359-360 (Nov. 2007), p. 404-408 
    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: Micro abrasive jet machining (MAJM) is a high effective economical technology for threedimensional micro structure fabrications of brittle materials. It is widely used in the fabrication ofsemiconductors, electronic devices, micro electro-mechanical systems (MEMS), optical-electronicand optical devices, and medical instruments. In this paper, based on the experimental study ofMAJM for glass, the influences of the nozzle type/size and abrasive type on the material erosion rateand structure profile are analyzed. The results show that the rectangular nozzle can yield a moreaccurate and efficient machining performance due to reduced flux effect. By contrast, with roundnozzle all the cross section profiles of the machined patterns show rounded V-type shape. Therectangular nozzle is able to produce geometry with flat shape. The machining area is almostindependent of the abrasive hardness, and the erosion rate increases with the increase in the hardnessof the abrasive grits. The nozzle geometry is of great importance for machining accuracy and theefficiency
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.359-360.404.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    The Toughening Action of Comprehensive Transformation on Mixed Mode II-III Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1779-1782 
    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: By the use of comprehensive transformation criterion and the method of weight function, the fracture enhancement of mixed-mode II-III crack in transformation toughened ceramics is predicated. The theoretical expressions of the toughening effect for both the stationary and steady-state growing crack are given respectively. The results show there is no toughening effect for the stationary crack and the toughening effect for the steady-state growing crack is associated with themodulus of elasticity, the width of transformation and its volume fraction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1779.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Expression of ODF and ICAM-1 of Bone Marrow Mesenchymal Stem Cells is Enhanced with Osteogenic Differentiation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 1173-1176 
    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: Osteoblasts were perceived as pivotal cells, recognized as the cells that control both the formativeand the resorptive phases of the bone remodeling cycle. Osteoblasts were an essential requirement forosteoclastogenesis though expressing or secreating bioactive osteoclast-differentiation-regulatory proteins,osteoclast differentiation factor (ODF)was the most important factor among these, ODF participate nearly inevery step of differentiation and activation of osteoclasts. In addition, intercellular adhesion molecule-1(ICAM-1)and its receptors LFA-1 play a role in osteoclast development by affecting adhesion betweenstromal cells and osteoclast progenitors before the occurrence of ODF-ODF receptor signaling. However, itis not clear about the relationship between ODF, ICAM-1 expression of osteoblasts and differentiation stateof osteoblasts. So,the aim of this study was to investgate whether the expression of ODF, ICAM-1 dependedon the stage of osteoblastic differentiation from rat bone marrow mesenchymal stem cells(rBMSCs). Theviability of rBMSCs is reduced significantly by osteogenic inducement as differentiating into osteoblasts,ALPase activity of OS-treated rBMSCs was enhanced obviously within 9 days , declined subsequently andrecovered nearly the original level at day 14. Expression of ODF is enhanced with osteogenic differentiationguadully. whereas, expression of ICAM-1 is activated at OS-treated day 6, then keeping at a stable level.This study indicated that rBMSCs undergoing osteogenic inducement was an ideal model for studying thedifferentiation and maturation of osteoblasts. During the early stage of differentiation along osteoblasts fromstem cells to osteocytes, rBMSCs or Osteoprogenitor react somewhat differently from osteoblasts,suggesting the ability of osteoblasts to regulating differentiation and maturation of osteoclasts have beenimproved with osteogenic culture
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.1173.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Isothermal Holding Temperature on NGS Kinetics of Phosphorus and Temper Embrittlement (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 549-552 
    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: When failure occurs in material, it is often occurs by fracture along some grain boundariesand often by the micro-segregation of embrittling impurity to the grain boundaries. In the presentwork, the non-equilibrium grain-boundary segregation (NGS) kinetics of phosphorus and the temperembrittlement at the same solution treatment and different isothermal holding temperature in steel2.25Cr1Mo are studied. The NGS kinetics curves of phosphorus at the same solution temperature（1050 oC ）and different isothermal holding temperature (540 oC and 600 oC) are given. Experimentalresults provide a direct evidence of NGS kinetic model and show that the grain boundary segregationconcentrations of phosphorus for specimen isothermal holding at 540 oC are higher than those at 600oC. The peak values of AES patterns of solute atoms for specimen isothermal holding at 540 oC arealso higher than those at 600 oC. It is therefore concluded that the lower the isothermal holdingtemperature, the higher the segregation concentration of phosphorus at the grain-boundaries, and alsothe higher the degree of embrittlement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.549.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal Fatigue Life Prediction of Ni Base Alloy Ceramic Composite Coating (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1775-1778 
    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: Ni base alloy ceramic grain composite coating is used mostly in high temperature condition, so thermal fatigue failure will be easy. If the thermal expansion coefficients and elastic modulus of Ni base alloy and ceramic grain are different, there will be thermal stresses between grain and matrix in thermosyphon. The thermal stress will arouse the initiation and growth of thermal fatigue crack. We use Eshebly-Mori-Tanaka method to study the thermal stress field in matrix and grain. It can be shown that the more difference of thermal expansion coefficients between Ni base alloy and ceramic grain is, the bigger the thermal stress is. The thermal stress relates to volume fractions and elastic constants of Ni base alloy and ceramic grain. Based on low-cycle fatigue crack growth rate formation, the thermal fatigue life was computed. The bigger thermal stress is, the smaller thermal fatigue life is. Thermal life is anexponential function of crack initiation length and critical length
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1775.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    A Study on Erosion Mechanisms of Quartz Crystals Polished by Micro Abrasive Waterjet (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 24-25 (Sept. 2007), p. 195-199 
    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: The potential of abrasive waterjet technology was investigated as a method to polishZ-blocks of synthetic quartz crystals. The polished surfaces were characterized by surfaceroughometer and scanning electron microscopy. The main factors affecting the surface roughness andthe erosion mechanisms related to material removal were analysed. It is found that abrasive mesh,water pressure and jet incidence angle are the main factors affecting the surface roughness. Bycontrast, the influence of traverse speed on the surface roughness is small. Under certain controlledconditions, the erosion mechanisms of synthetic quartz crystals are plastic flow, leaving a crack-freesurface by low-middle pressure micro abrasive waterjet
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.24-25.195.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Construction and Quality Control of Concrete Using Barite as Aggregate (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 302-303 (Jan. 2006), p. 462-469 
    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 presents mix proportion design and the construction of the barite concrete structure, mixing, transportation and construction characteristic of the barite concrete. Technical solutions were proposed to problems in construction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.302-303.462.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Study on the Multi-Scale Nanocomposite Ceramic Tool Material (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 315-316 (July 2006), p. 118-122 
    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 advanced ceramic cutting tool material was developed by means of micro-scale SiCparticle cooperating with nano-scale SiC particle dispersion. With the optimal dispersing andfabricating technology, this multi-scale nanocomposite may get both higher flexural strength andfracture toughness than that of the single-scale composite. The improved mechanical properties maybe mainly attributed to the inter/intragranular microstructure with a lot of micro-scale SiC particleslocated on the grain boundary and a few nano-scale SiC particles located in the matrix grain.Because of the thermal expansion mismatch between SiC and Al2O3 resulting in the compressivestress on the SiC/Al2O3 interface, the interface bonding strength between Al2O3 and SiC wasreinforced, which can compel the crack propagating into the relatively weak matrix when meetingthe SiC particle on the boundary; while the alumina grain boundary is not the same strong as theSiC/Al2O3 interface and the Al2O3 grain, therefore the crack propagates sometimes along the Al2O3grain boundaries and sometimes through the grains, when reaching to the nano-scale SiC particleinside the matrix, the crack was pinned and then deflected to the sub-grainboundaries. Thesecoexisting transgranular and intergranular fracture mode induced by micro-scale and nano-scale SiCand the fining of matrix grain derived from the nano-scale SiC resulted in the remarkablestrengthening and toughening effect
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.315-316.118.pdf
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