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  • 2005-2009  (10)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Development of Robust Microvavles for Compact Robust Pumps/Hydraulic Actuators (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1207-1210 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In situ UV-LIGA assembled robust micro check valves with large flow rates (〉10ml/s, displacement related), high-pressure support ability (〉10 MPa) and highoperational frequencies (〉10 kHz) made of nano-structured nickel were presented inthis paper. The microvalve consists of an array of 80 single micro valves to achieve therequired flow rates. Test results show that the forward flow rate is about 19 ml/s underpressure of 90Psi. The backward flow rate is negligible. The reliability of the valve isensured by the valve design and nanostructured nickel realized. The tested tensilestrength of a nano structured nickel is about 1GPa. The strength of SU-8 is 50MPa,which is more than 50% higher that fabricated with a standard process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.1207.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Crack Growth Behavior of Al Alloy under Ultrasonic Fatigue (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 327-330 
    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 order to investigate the effect of frequency on the crack growth behavior,ultrasonic fatigue tests were carried out for an extruded age-hardened Al alloy, 7075-T6, andthe results were compared with those in rotating bending fatigue. Fatigue strength in ultrasonicwas higher than that in rotating bending. This was mainly caused by the retardation of crackinitiation. Growth direction of a crack changed from a tensile mode to a shear one in ultrasonicfatigue, though fracture occurred by the growth of a tensile mode in rotating bending. Thegrowth direction of a shear mode crack was inclined about 55 degrees to the tensile axis. Therelation between an applied stress σa and a crack depth at transition of growth direction [removed info]T[removed info]was expressed by [removed info]an[removed info]T=C, where C and n are constants. These results were discussed fromthe points of view of the time dependent environmental effect and the texture of material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.327.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Test Research on the Optimizing Technological Parameters of the Ultrasonic Vibration Honing (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 53-54 (July 2008), p. 185-190 
    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 contrast experiments between ultrasonic vibration honing and ordinary honing arefirstly taken. It shows that the removal rates and the working accuracy of ultrasonic honing aremuch better than that of the ordinary honing. Then the optimum experiments on technologicalparameters of ultrasonic vibration honing on engine cylinder is taken, which gained the propertechnological parameters. The experimental results indicate that the gained parameter totally meetsthe actual need and reaches a new height in this field, which provides the reliable technologicalparameter for the ultrasonic vibration honing to process cylinder and has a broad application inprospect
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.53-54.185.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Homogeneous Flow of In Situ Bulk Metallic Glass Matrix Composite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 561-567 
    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 compressive deformation behavior of as-cast Zr55.9Cu18.6Ta8Al7.5Ni10 Bulk MetallicGlass (BMG) composite with micro-scale particles of Ta-rich solid solution embedded in anamorphous matrix was investigated in the supercooled liquid region. It was found that the apparentviscosity of the BMG is dependent on temperature and strain rate. A deviation from a Newtonianbehavior was observed at high strain rate and low temperature. The experimental results can bedescribed by a master curve based on a stretched exponential function and the free volume theory. Thestructural state and the thermal ability of the BMG composite after deformation are also discussed inthe paper
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.561.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Microstructures, Tensile Properties and Forming Process of AZ31 Alloy Sheets (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 241-244 
    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: Rolling and punching techniques of AZ31 alloy were investigated in this paper. Variousrolling experiments were carried out to make fine-grained Mg sheets. Punching tests were conductedat the temperatures range from 70 to 300 oC. The analysis revealed that there existed an excellentwarm forming temperature for as-rolled AZ31 alloy. A warm deep punching tool setup using heatingelements was designed and manufactured to produce the cell phone. Microstructures were observedusing optical and scanning electron microscope equipped with EBSD. The textures in as-rolled andas-annealed specimens attribute to different mechanical properties along the various direction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.241.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Expression of elafin in extramammary Paget's disease (2005)
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 152 (2005), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.2005.06425.x
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Using large eddy simulation to study particle motions in a room (2005)
    Oxford, UK : Munksgaard International Publishers
    Indoor air 15 (2005), S. 0 
    Details
    ISSN: 1600-0668
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0668.2005.00373.x
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    The Osteogenic Potential of Stem Cell- and BMP2 Gene-Activating Bioceramic In Vivo (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 941-944 
    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: Stimulation of bone healing through local application of growth factors from implantsmay improve the clinical outcome in fracture treatments. However, the growth factors in reconstructive application require supraphysiologic dosing and considerable expense while hampering their clinical application. Genetic modification of mesenchymal stem cells (MSCs) to both produce and respond to osteogenic factors may have potential for use in enhancing bone healing. In this study, MSCs were genetically modified by a recombinant adenoviral containing the gene for human bone morphogenetic protein 2 (hBMP-2). The gene-transduced cells wereincorporated with a porous beta-tricalcium phosphate (TCP) as a novel complex. We investigated osteogeneic potential of gene-transduced MSCs/ceramic and the ability of the complex on facilitating bone formation in a radius segmental defect of rabbits. In vitro results showed that there were apparent hBMP2 gene expression and protein synthesis in MSCs with hBMP2 stably transfection, whereas negative expression of hBMP2 in controls. Histological studies demonstrated that gene-transfected MSCs/ceramic composite appeared an ability of heterotopic osteogenesis. In the segmental bone defects, endochondrial ossification at fracture sites was found in both transfected and untransfected MSCs-ceramic composites. While the composite with hBMP2 transfection showed the earliest and the most effective healing of the segmental bone defects both radiographically and morphologically. Our results show that genetically modified MSCs/ceramicshad enhanced osteogeneic capacity relative to unmodified MSCs or only ceramic implants. This study suggests that use of cell-and gene-activated bioceramics may offer promise for molecular design of implants to induce osteogenesis and enhance bone regeneration
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.941.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Influence of Loading Frequency on Fatigue Behavior of High Strength Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 227-230 
    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 order to investigate the influence of loading frequency on the fatigue behaviors of thehigh strength steel, ultrasonic fatigue tests were carried out for a high-carbon-chromium steel andthe results were compared with those of fatigue tests using conventional rotary bending fatigue testmachine with a frequency of 52.5Hz. The different of fatigue strength at ultrasonic frequency leveland conventional frequency level is very small and the S-N curve obtained from 20 kHz or 52.5 Hzshows the step-wise shape. The fatigue crack occurred from inclusions on the subsurface site in thelong life regime and the typical surface fracture occurred in the short life one though the loadingfrequency level is different. It is indicated that ultrasonic fatigue method is an effective method toinvestigate the fatigue properties in super-long life region
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.227.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Fatigue Crack Growth Resistance in Ni-Base Super Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 541-544 
    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: Rotating bending fatigue tests were carried out to investigate the influence of grain sizeon the resistance to crack growth of Ni-base super alloy, Inconel 718, using the materials with grainsizes of about 20, 50,100 and 200 たm, at room temperature. The larger grain size, the smaller crackgrowth rate, though the static strength was decreased with increase in grain size. The growth rate ofa small crack was uniquely determined by the term jana (Small crack growth law), where ja and aare the stress amplitude and the crack length, respectively, and n is a constant. The resistance tocrack growth among materials was evaluated based on the law and showed a good correlation withtensile strength jB, meaning that fatigue life can be predicted by using only j B BB
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.541.pdf
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