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  • 1
    Electronic Resource
    Electronic Resource
    Green Pump Development Based on the Analysis of Unsteady Flow (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 643-650 
    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: Centrifugal pump is a kind of important industrial installation for fluid delivery. Theresearch on the unsteady flow in centrifugal pump is very meaningful to reducing vibration. Particleimage velocimetry (PIV) system and test pump designed for PIV measurement were introduced. Theexperimental scheme and the methods of numerical simulation were discussed. PIV technique wasused to measure the unsteady velocity field near the volute tongue under the mode of externalsynchronization. The unsteady pressure field was simulated by using Sliding Mesh (SM) modelprovided by Fluent. The results show that the velocity and pressure fluctuate periodically with therotation of impeller. Partial fluid flows back to the impeller passage and the velocity in the inlet ofdiffusion tube decreases significantly due to shunt effect of the volute tongue. On the section VIII, themagnitude and fluctuation range of velocity show a decreasing trend in radial direction. Thefluctuation of circumferential velocity is related to the position of high-speed flow in impellerpassage, and the fluctuation of radial velocity is influenced by blade interference and Coriolis force.The static pressure increases and the dynamic pressure decreases in the radial direction of volute. Thevelocity and the pressure on the section VIII and the outlet total pressure fluctuate intensively whenthe blade tail end passes the section VIII and the volute tongue. The vibration of pump can be reducedby increasing the volute tongue mounting angle and decreasing the blade outlet mounting angleproperly
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.643.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Development of a New Kind of Sealing Composite Material Reinforced with Carbon and Glass Hybrid Fibers (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 651-658 
    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: A new kind of sealing composite material reinforced mainly with carbon and glass hybridfibers was developed with calendar preparation method. In consideration of the difference of surfacebehavior, carbon fiber and glass fiber were pretreated by various surface treatment methods, and theeffect of these methods on the material properties and interface bonding between fibers and matrixwas studied through the transverse tensile test and SEM analysis. The optimum prescription of thesealing composite material was obtained by regression design method, adopting stress relaxation at300°C as evaluating indicator. The performances of the developed sealing composite material weretested, and the results indicated that the main performances of the material coincided with therequirements prescribed in Chinese national standard and some performances were even better thanthat of the products of some famous corporations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.651.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Study on Temperature-Dependent Tensile Strength of Short-Fiber-Reinforced Elastomer Matrix Composites (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 97-104 
    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 temperature-dependent tensile strength is an important indicator used to evaluatecombination property of short-fiber-reinforced elastomer matrix composite. Someshort-fiber-reinforced elastomer matrix composites are manufactured in the molding preparationprocess, and the tensile tests of fiber, matrix and the composites are carried out at differenttemperatures. The fiber length and orientation distributions are statistically analyzed. The influence oftemperature on the micromechanical stress distribution and transfer in the composite is investigated,and the thermal stresses in the fiber, matrix and fiber-matrix interface are obtained. Based on thetheory of micromechanical stress distribution and transfer of the fibrous composite, the mixture law ismodified, and a model for predicting the temperature-dependent tensile strength of this kind ofcomposite is developed. Moreover, the mechanism of the tensile fracture of the composite at varioustemperatures is discussed. Research indicates that the tensile strength is largely related to thetemperature, mechanical performances of the main components of the composite and somemicrostructural parameters, such as short fiber aspect ratio, volume fraction and orientationdistribution. The tensile strength of SFRE decreases with increasing temperature. The tensile strengthincreases with the increase of fiber length when the fiber length is no larger than critical fiber length.There exists a critical fiber volume fraction where the tensile strength of SFRE reaches the maximum.The tensile fracture of the composite depends largely on the temperature, the bond strength offiber-matrix interface and the average length of reinforcing short fibers. The temperature-dependenttensile strengths predicted by the presented model are in good agreement with experimental data
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.97.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    To help helpdesk: a field study of online help systems in campus context (2004)
    Bradford : Emerald
    Campus-wide information systems 21 (2004), S. 81-94 
    Details
    ISSN: 1065-0741
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: This paper reports on a field-based study of online help systems at the University of Maryland. After collecting data by means of interview, observation and focus group, analysis is grounded on the contextual data, thus shedding light on particular organizational and human behavioral issues on online help systems. The objectives of this research are to offer insights, enhance understandings, and provide a meaningful guide to design online help systems for educational institutions. Based on the contextual information and data analyses, several constructive thoughts are brought forward, along with the prototype system, for campus-wide online help systems design. These implications include developing more time-critical and task-sensitive online help, merging CMC approaches, and customizing online help in terms of different user groups, even towards specialized online help systems. The limitations of this research are enunciated and future research as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10650740410529510
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  • 5
    Electronic Resource
    Electronic Resource
    Silencing of TGF-β signalling by the pseudoreceptor BAMBI (1999)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 401 (1999), S. 480-485 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Members of the transforming growth factor-β (TGF-β) superfamily, including TGF-β, bone morphogenetic proteins (BMPs), activins and nodals, are vital for regulating growth and differentiation. These growth factors transduce their signals through pairs of transmembrane type I and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/46794
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  • 6
    Electronic Resource
    Electronic Resource
    IT induction in the food service industry (2001)
    Bingley : Emerald
    Industrial management & data systems 101 (2001), S. 13-20 
    Details
    ISSN: 0263-5577
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science , Economics
    Notes: As part of the business strategy in a competitive environment, for an organization to induct information technology (IT) appropriately, business process reengineering (BPR) must be conducted. We propose a process that incorporates both management information systems and strategic management concepts for the IT induction. First, we develop a business competition strategy based on Porter's five competitive forces; second, using concepts developed in the field of information systems the business processes are reengineered to improve effectiveness and efficiency; and finally, IT strategy is developed to achieve these goals. A real-life case in the food service industry is used to illustrate this process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02635570110365961
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  • 7
    Electronic Resource
    Electronic Resource
    Development of a New Kind of Sealing Composite Material Reinforced with Aramid and Pre-Oxidized Fibers (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1243-1246 
    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: A new kind of sealing composite material reinforced mainly with aramid andpre-oxidized fibers were developed by molding preparation method. The effect of different surfacetreatment methods of the fibers on the heat resistance of the composite material was studied. Theoptimum prescription of the sealing composite material was obtained by regression design method.The relationship between the transverse tensile strength of the material after ageing at elevatedtemperatures and its main ingredients was investigated. The performances of the developed sealingcomposite material were tested, and the results indicate that the main performances of the materialcoincide with the requirements prescribed in Chinese national standard and some performances areeven better than that of the products of some famous corporations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1243.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of Plasma Sprayed Ceramic and Cermet Coatings on Wear-Out Failure of High Temperature Ball Valve (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 373-374 (Mar. 2008), p. 11-14 
    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: Three kinds of coating materials, namely Cr2O3 ceramic, Al2O3-TiO2 ceramic and WC-Cocermet, were screened and sprayed on the surface of valve ball by plasma spraying technology, andtwo kinds of brush plating materials, namely high speed nickel and nickel tungsten, were alsoscreened and brush plated on the surface of valve seat by electrical brush technology. Themicrostructure and morphology of the plasma sprayed coatings were analyzed by means of scanningelectron microscopy. The tribological properties of the plasma sprayed coatings sliding against thehigh speed nickel and nickel tungsten layers were investigated on a pin-on-disc friction and weartester. The microhardness, thermal shock property and bonding strength of the coatings were alsotested. The results indicate that the sealing pair composed of the valve ball with the plasma sprayedcoating of Al2O3-TiO2 and the valve seat with the brush plating layer of nickel tungsten has the bestcombination property
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.11.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Design Technology of Ω-Shaped Seal Ring Based on Plastic Limit Analysis (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2691-2694 
    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: The nonlinear finite element method (FEM) was applied to the analysis of the straindistribution in [removed info]-shaped seal rings acted by internal pressure or the combined action of internalpressure and axial displacement. The results indicate that the maximum Mises equivalent strainexists at the juncture between the exterior surface of the loop and that of the knuckle when the ringis acted by axial compression displacement and relatively large internal pressure, which is inagreement with the practical work conditions of the rings. According to the plastic limit analysismethod, the limit internal pressure should be determined based on the strained condition of thejuncture between the exterior surface of the loop and that of the knuckle of the ring by using twifoldelastic slope criterion. The formulae for calculating the limit internal pressure of the rings were alsoderived by regression analysis of the FEM results. These formulae can be used in the limit designand the safety assessment of [removed info]-shaped rings
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2691.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Filtrations of principal indecomposable modules of Frobenius kernels of reductive groups (1985)
    Springer
    Mathematische Zeitschrift 189 (1985), S. 515-527 
    Details
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01168157
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