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  • 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
    Defects in Zirconium Fluoride Glasses (1991)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 32-33 (Jan. 1991), p. 237-242 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.32-33.237.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Injected Water on Hydraulic Fracturing Deduced from Acoustic Emission Monitoring (1997)
    Springer
    Pure and applied geophysics 150 (1997), S. 627-646 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Hydraulic fracturing, acoustic emission, fault plane solution, fracturing mechanism.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract. —In order to investigate the effects of injected water in hydraulic fracturing, experiments were conducted on cubic granite specimens, comparing fracturings induced by conventional water injection with those induced by pressurization of a urethane sleeve, thereby realizing "hydraulic fracturing" without the use of fracturing fluid. In both experiments, a shear type mechanism was found to be dominant in fault plane solutions of AE events. However, in the case of water injection, cracks extended rapidly with large drops in hole water pressure and bursts of AE, whereas in pressurization by the urethane sleeve, cracks extended stepwise with no such large drops in hole pressure and no bursts of AE. The difference in crack extension in the two experiments can be analyzed by comparing relations between crack length and stress intensity factor of mode I at a crack tip. The observation and analysis indicate that existence of fracturing fluid like water helps initiated cracks to extend rapidly and widely in hydraulic fracturing in actual HDR fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050096
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  • 4
    Electronic Resource
    Electronic Resource
    Swirling flows in circular-to-rectangular transition ducts (1996)
    Springer
    Experiments in fluids 20 (1996), S. 401-409 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Swirling flows in three circular-to-rectangular transition ducts, each of them with an aspect ratio of 2.0 at the rectangular exit, have been studied experimentally. The swirling flows were produced by swirlers whose vane angles were at 5°, 10° and 20° inclinded to the incoming flow, respectively. Flow visualization experiments were made at selected cross-sectional planes in the transition ducts. Pressure and velocity measurements were obtained on the contoured duct walls and at the rectangular exit planes, respectively. The results show that the swirling flow pattern evolves into a skewed structure at the exit plane which, in connection with the wall pressure distributions, is asymmetric with respect to the centerline of either the top and bottom walls or the side walls. Moreover, an analysis based on the mean streamwise vorticity equation with the velocity data obtained immediately downstream of the rectangular exit plane indicates that the cross-stream Reynolds stress plays an important role in transporting the streamwise vorticity of the swirling flow into the surrounding fluid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189378
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  • 5
    Electronic Resource
    Electronic Resource
    Raman-spectroscopy study of PbTiO3 thin films grown on Si substrates by metalorganic chemical vapor deposition (1996)
    Springer
    Applied physics 62 (1996), S. 281-284 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 78.30.Hv; 63.20. ; e; 81.15.Gh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Raman spectra have been investigated in PbTiO3 thin films grown on Si by metalorganic chemical vapor deposition. A large grazing-angle scattering technique was taken to measure the temperature dependence of Raman spectra below room temperature. All Raman modes in the thin films are assigned and compared with those in the bulk single crystal, a new A 1(TO) soft mode at 104 cm-1 was recorded which satisfies the Curie-Weiss relation ω2=A(T c−T). Intensities of the A 1(1TO) and E(1TO) modes were anomalously strengthened with increasing temperature. Raman modes for the thin films exhibit remarkable frequency downshift and upshift which is related to the effect of internal stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575095
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  • 6
    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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  • 7
    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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  • 8
    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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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Optical Properties of InGaN/GaN Multiple Quantum Wells (1998)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 264-268 (Feb. 1998), p. 1295-1298 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/03/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.264-268.1295.pdf
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