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  • 11
    Electronic Resource
    Electronic Resource
    Growth Characteristic and Fracture Toughness of Laser Rapidly Solidified Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉/YAG/ZrO〈sub〉2〈/sub〉 Ceramic Eutectic 〈i〉In Situ〈i〉 Composite (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 495-500 
    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: Directionally solidified oxide ceramic eutectic composites with superior strength,oxidation resistance, creep resistance, structural stability and low sensitivity to crack at hightemperature have aroused much attention in recent years, and various preparation techniques havebeen developed. In situ fabrication of ceramic eutectic composites by laser rapid solidification is acheap and quick method compared to conventional multi-step fabrication methods of fiber reinforcedcomposites for high temperature use. In this paper, Al2O3/YAG/ZrO2 ternary eutectics are rapidlyprepared from melt by directional solidification using laser zone remelting technique, the growthcharacteristic and fracture toughness are investigated. The results show that: (1) Laser rapidlysolidified Al2O3/YAG/ZrO2 ceramic eutectic in situ composite presents a fine interpenetratingnetwork structure, in which Al2O3, YAG and ZrO2 phases are continually interconnected and finelycoupled without pores, colonies and grain boundaries between interfaces. (2) Laser scanning rate andpower density strongly affect the eutectic growth. With the processing parameters adjusted properly,the eutectic shows homogeneous and coupled lamellar microstructure. The characteristic dimensionsof the microstructure are around 2~3 1m for Al2O3 and YAG phases, and around 0.2~1 1m for ZrO2phases, respectively. (3) The hardness and fracture toughness of the rapidly solidifiedAl2O3/YAG/ZrO2 eutectic are 16.7 GPa and 8.0 MPa.m1/2, respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.495.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    Low Carbon Low Alloy Submicro-Steel with Nano-Precipitation (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 503-504 (Jan. 2006), p. 511-514 
    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, low carbon low alloy submicro-steel sheet has been developed successfully by severe warm-rolling (SWR) at 500 °C through a single pass. The result shows submicro-structure can be fabricated by severe rolling. The formation of the submicro-structure is attributed to the grain refinement mechanism induced by the severe plastic deformation (SPD). The refinement involves the cutting and subdividing of the original micro-crystals into ultrafine grains by dense dislocation arrays. To a certain extent, dynamic recrystallization in ferrite during SWR also seems to contribute to the formation of the submicro-structure. The thermal stability of the submicro-steel was investigated by annealing the steel at different temperatures. The investigation indicated that the submicro-steel can be subjected to annealing at 550°C without apparent grain growth. The unusually high thermal stability can be attributed to the pining effect of numerous uniformly distributed nano-precipitates in the steel. The sizes of the nano-precipitates belong to two different orders. The average diameter of the large precipitates is about 30 nm and the smaller one less than 10 nm
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.503-504.511.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    Acoustic Emission Research on Thermal Shock Behaviors of Three-Dimensional C/SiC Composites in Different Environments (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1585-1590 
    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: Three-dimensional (3D) carbon fiber reinforced silicon carbide matrix composites (C/SiC)were prepared by a low-pressure chemical vapor infiltration method. The thermal shock behaviors ofthe composites in different environments were researched using an advanced acoustic emission (AE)system. Damage initiation and propagation were easily detected and evaluated by AE. The thermalshock damage to C/SiC composites mainly occurred at the process of cooling and was limited at argonbut unlimited at wet oxygen atmosphere. Also correlations have been established between thedifferent damage mechanisms and the characteristics of acoustic emission signals obtained duringthermal shock tests. In this way, the paper contributes to the development of the acoustic emissiontechnique for monitoring of damage development in ceramic-matrix composites
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1585.pdf
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  • 14
    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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  • 15
    Electronic Resource
    Electronic Resource
    Laser Zone-Remelted Alumina-Based Eutectic In Situ Composite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 832-836 
    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: Due to excellent oxidation and corrosion resistance at elevated temperature, oxide ceramiccould be the preference served at high temperature oxidizing atmosphere over a long period of time.In recent years, alumina-based eutectic in situ composite prepared by various solidificationtechniques, which has superior properties even close to the melting point about 2100K, has been paidmuch attention. In this paper, Al2O3/YAG/ZrO2 ternary eutectic and hypoeutectic ceramics areprepared from melt by laser zone-remelting technique, the rapid solidification characteristic and themechanical property of the composites are investigated. The results show that: (1) Compared tosintered composite with the same composition, laser zone-remelted Al2O3/YAG/ZrO2 eutectic in situcomposite has different microstructure showing fine interpenetrated network with Al2O3, YAG andZrO2 phases continuously intergrown, while none of pores, grain boundaries and amorphous phasesis found. (2) The scanning rate and the power density of the laser beam has strong effect on themicrostructure morphology. When the power density is determined, the eutectic spacing is reducedwith the scanning rate increased. The characteristic eutectic spacings and phase sizes of YAG andAl2O3 are about 2~3μm, and the characteristic dimension of ZrO2 is less than 1μm. (3) The hardnessand the room-temperature fracture toughness of Al2O3/YAG/ZrO2 eutectic are respectivelyHv=16.7±2.0 GPa and KIC=8.0±2.0 MPa.m1/2, and those of hypoeutectic are respectivelyHv=15.8±2.0 GPa and KIC=3.9±1.0 MPa.m1/2
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.832.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Property of Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉/Y〈sub〉3〈/sub〉Al〈sub〉5〈/sub〉O〈sub〉12〈/sub〉 (YAG) Eutectic Ceramic In Situ Composite Prepared by Laser Zone Melting (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 999-1002 
    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: Directionally solidified Alumina-based eutectic ceramic in situ composite is a kind ofpromising candidate for high temperature structural material applied at elevated temperature above1923K because of its excellent properties. With laser zone melting directional solidification,Al2O3/Y3Al5O12 (YAG) eutectic ceramics are successfully prepared. The relationship between theeutectic microstructure and the processing parameter is studied, and the mechanical property of thecomposite is measured. The results show that: (1) Laser power density and scanning rate stronglyaffect the eutectic microstructure. With proper processing parameters adjusted, the binary lamellareutectic microstructure is obtained, in which Al2O3 and YAG phases are three-dimensionally coupledand continuously connected without grain boundaries and amorphous interface phases. (2) Theeutectic spacing decreases to about 1μm with increasing scanning rate. (3) The maximum hardness of19.5GPa and the room fracture toughness of 3.6MPa.m1/2 are obtained by Vickers indentationmeasurement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.999.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    A New Algorithm to Refresh File Aggregates in Distributed Enterprises (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 1001-1004 
    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 cost budget of distributed enterprises depends on large quantities of operating dataand aggregates data. Policymakers of these enterprise groups work out their cost budget accordingto their subjective judgement and experience. The reasons for their doing so are that scattered datamemory is short of unified format and standardization and that current data fail to reflect theirdynamic changes,etc. Here for the benefit of policymakers of the concerned enterprises and bymaking use of the cost of the enterprise logistics, analysis of the cost management and that ofdevelopment of decision support prototype system are being conducted.The technical managementof distributed date warehouse, heterogeneous data source in the integrated subsidiary andheterogeneous model based on my ETL design ,that is based on a kind of new data algorithm whichis developed by utilizing mode matching and data-filtering technology. It can accelerate the speedof data renewal, filter the heterogeneous data , seek out different sets of data ,and offer the databasis for further decision from policymakers. It has been proved to be efficient by its successfulapplication in the corporation working on distributed enterprises
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.1001.pdf
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  • 18
    Electronic Resource
    Electronic Resource
    Recent Activities on Directional Solidification at the State Key Laboratory of Solidification Processing (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 3106-3111 
    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: Directional solidification technique permits materials to grow along specificorientation, in order to obtain mechanical and/or physical anisotropy. The present researchattempts to introduce the research work in the field of processing of some advanced materialsby innovative directional solidification techniques performed at State Key Laboratory ofSolidification Processing and with author’s intended research work.The paper deals with the specific topics on state of the art of directional solidification:single crystal superalloy and Nd-Fe-B alloys under high thermal gradient, Cu-Ni alloys underdeep supercooling of the melt.The relevant solidification phenomena, such as morphological evolution, crystal growthfor multi-phases in the processing of directional solidification, are discussed briefly. The trendsof developments of directional solidification techniques are also prospected
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3106.pdf
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  • 19
    Electronic Resource
    Electronic Resource
    Applying TRIZ to Service Conceptual Design: An Exploratory Study (2005)
    Oxford, UK and Malden, USA : Blackwell Publishing Ltd.
    Creativity and innovation management 14 (2005), S. 0 
    Details
    ISSN: 1467-8691
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: This paper introduces a new avenue for applying the Theory of Inventive Problem Solving (TRIZ). TRIZ tools may be used in designing new service concepts in the field of new service development (NSD). Up to the present time, the practice of generating new ideas in NSD has been dependent largely on inspiration, luck and flair. One shortcoming in the generation of creative ideas is the psychological inertia or mental block commonly encountered. This research proposes to use TRIZ to help spawn new and perhaps unorthodox ideas and concepts in NSD. A case study on canteen operation demonstrates the feasibility of applying TRIZ in service design.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-8691.2005.00323.x
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  • 20
    Electronic Resource
    Electronic Resource
    Radiation temperature scaling in indirect-drive hohlraums (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 3337-3344 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hohlraum radiation temperature is studied for Gaussian laser pulses of order of 1 ns. The simulation results show that for this kind of pulse, the self-similar law of the radiation hydrodynamics is also valid in its time-rising phase. The scaling of the hohlraum radiation temperature as a function of laser parameter, hohlraum size, and x-ray conversion efficiency is obtained and the effect of laser entrance hole is included. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873573
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