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  • 2005-2009  (2)
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Material
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  • 2005-2009  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Broadband Dielectric Properties of the Ba〈sub〉3〈/sub〉MnTa〈sub〉2〈/sub〉O〈sub〉9 〈/sub〉Complex Perovskites (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 381-382 (June 2008), p. 537-540 
    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: We report the results of the broadband dielectric constant and loss tangent of the newcomplex perovskites Ba3MnTa2O9 with the test frequency f in different ranges from 1 kHz to 15 GHz.For the test frequency f below 1 MHz, the dielectric constant and loss tangent of the specimens weremeasured using a LCR meter with four-terminal configuration. The measurements at frequenciesbetween 50 MHz and 1 GHz were performed by the lumped impedance method, which uses animpedance analyzer to measure the complex impedance of the specimen. At frequencies above 1GHz, two samples with diameter 9 mm and different thicknesses (2.73 mm and 5.42 mm) weremeasured by a home-made Hakki-Coleman resonator. The TE011 resonant peaks were found andidentified with an Agilent PNA net-work analyzer. The dielectric constants were found to remainalmost constant with the test frequency at room temperature. The calculated values of the real partdielectric constants are 17.74 and 17.53 at 9.86 GHz and 15.43 GHz, respectively. The unloaded Qfactors deduced from curve fitting of the peaks are both around 200
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.381-382.537.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Constant Power Control of Hydraulic Grinding Saw (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 304-305 (Feb. 2006), p. 465-468 
    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: Hydraulic grinding saw is a kind of important equipment broadly used in billet precisecutting in metallurgical industry. In order to improve productivity significantly, control feeding speed reasonably, at the same time to compensate the variation of driving torque caused by the change of contacting area between grinding wheel and slab, thus to obtain the optimized match between the feed of the grinding wheel and the driving motor, the application of hydraulic servo system in the control of the feeding speed of grinding wheel is discussed in this thesis. This article introduces the principle of hydraulic grinding saw, brings out the project of constant power PIDcontrol based on the relationship between driving torque and motor current. The transfer function of the hydraulic servo system, the optimized PID controller is also worked out. According to the result of simulation analysis, the controlling factors can be well obtained
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.304-305.465.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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