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  • 1
    Electronic Resource
    Electronic Resource
    Stability of Two-Span Rotor-Bearing System with Coupling Faults of Crack and Rub-Impact (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2501-2504 
    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 dynamic model was set up for the two-span rotor–bearing system with coupling faultsof crack and rub-impact. Using the continuation-shooting algorithm for periodic solution ofnonlinear non-autonomous system, the stability of the system periodic motion was studied by theFloquet theory. The unstable form of the rotor system with coupling faults is Hopf bifurcation whenthe depth of crack is smaller. The influence to the response of the system increased along with thedepth of crack, the unstable form of the rotor system with coupling faults is period-doublingbifurcation. The conclusions provide theoretic basis reference for the failure diagnosis of the rotorbearingsystem
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2501.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    A New Up-and-Down Estimate Method for Sensitivity Test (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 389-394 
    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 up-and-down method is developed and a new estimate formula for the variance ofsensitivity variables is proposed. This formula fully considers the effect of test conditions on theestimating accuracy, resulting in higher order of precision. In order to give an objectivedemonstration, the Monte Carlo comparative results between the present method and the Brucetonmethod is given, which shows that the estimating values by the present method are much moreaccurate than those by Bruceton method in all conditions. Even with small samples, the presentmethod still could obtain a good estimate value. Thus the proposed method not only solves theproblem with traditional methods but also reduced the number of experiment, resulting in greatsaving. Finally, an application for safety fatigue limits is given
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.389.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Surface Modification of Basic Magnesium Sulfate Whiskers (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 58 (Oct. 2008), p. 191-198 
    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: Surface modification was conducted on the basic magnesium sulfate whiskers (MSW) using sodium stearate. The modification performance was evaluated by comparing the activation index, oil absorption value, rest angle, and dispersibility in polypropylene (PP) resin prior to and after treatment. It was found that the surface properties of the whiskers were improved by sodium stearate modification. In particular, the improvement in the dispersibility in PP was significant. Surface characterization was conducted using scanning electron microscopy (SEM), thermogravimetric-differential scanning calorimetry (TG-DSC) and fourier transform infrared spectroscopy (FTIR) for the raw and modified whiskers. The results indicated the co-existence of both chemical and physical adsorptions of sodium stearate on the surfaces of MSW
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.58.191.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental Study on Non-Perpendicular Frame Structure of Tall Building (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 400-402 (Oct. 2008), p. 593-598 
    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 shaking table model test is conducted for Guangzhou West Tower to study its seismic behavior in State Key Laboratory for Disaster Reduction in Civil Engineering at Tongji University. Guangzhou West Tower adopts a new structure system and the significant characteristic of this system is the non-perpendicular frame arranged around the building, acting both as columns and bracings. Based on the similarity theory and member equivalent principle，a 1/80 scale model of this building is made of polymethyl methacrylate(PMMA). The model’s dynamic characteristics, earthquake-resistant behavior, responses of acceleration and deformation under different wave peak values are investigated, then the seismic responses of the prototype structure are deduced and analyzed. The whiplash effect of the prototype structure is studied, and the weak position of the structure is found out. The experiment results demonstrate that it is feasible to apply this structural type to practical engineering. Finally, some suggestions for the engineering design of the prototype structure are put forward
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.400-402.593.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Tool Wear in High-Speed Milling of Ti-6Al-4V Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 375-376 (Mar. 2008), p. 435-439 
    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: Titanium alloys are widely used in the aerospace industry for applications requiring highstrength at elevated temperature and high mechanical resistance. However, titanium alloys areclassified as extremely difficult-to-cut materials owing to their physical, chemical, and mechanicalproperties, which result in the low material removal rate and the short tool life. This paper presentsan experimental research of the tool wear patterns and relevant wear mechanisms during high-speedmilling of Ti-6Al-4V with cemented carbide inserts. SEM-EDX analysis showed that nose wear andedge wear were the main tool failure modes during high-speed milling process, which weredifferent from the wear patterns under traditional cutting conditions. Adhesion, attrition anddiffusion wear mechanisms, as well as the cracks were responsible for the tool wear
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.375-376.435.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Simulation of Temperature Field during Semi-Solid Magnesium Alloy Produced by Casting-Rolling Technology (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 671-676 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The temperature fields during semi-solid magnesium alloy produced by casting-rollingtechnology has been simulated by finite element method on the basis of ANSYS. The temperaturefields for different conditions were obtained, which is consistent with the experimental results.Results show that there is a high temperature field in the casting and rolling zone. The temperaturefluctuates from the center to edge of the strip near the entry of the casting and rolling zone. but Thetemperature decreases gradually from the center to edge of the strip near the exit of the casting androlling zone. There are some remarkable effects of the temperature of the casting and rolling, thevelocity of the casting and rolling, the gap of two roll, the cooling of the roll and the diameter of theroll on the temperature field, which are in agreement with the experimental results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.671.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Performances of HSK Spindle/Toolholder Interface for HSM (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 269-272 
    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: With the rapid development of high-speed machining technology, more and moremachining centers have been equipped with the HSK toolholders. In this paper, the performances ofthe HSK spindle/toolholder interface, such as the axial movement, the radial deflection and thecontact stress distribution, were simulated by means of the finite element method and comparedwith the traditional BT interface. From the simulated results, it was pointed out that theperformances of the HSK interface were obviously superior to that of the BT interface, and theHSK interface was much more suitable for high-speed machining
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.269.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Constitutive Equation for 7050 Aluminum Alloy at High Temperatures (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 125-128 
    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: Accurately material constitutive model is essential to understand and predict machiningprocess. High temperature split Hopkinson pressure bar (SHPB) test system is used to investigateflow stress behavior and characteristics of 7050-T7451 aluminum alloy. Specimens are tested from200℃ to 550℃ at intervals of 50℃ and room temperature, at strain-rate of 2800s-1. The experimentalresults show that flow stress is strongly dependent on temperature as well as strain rate, flow stressdecreases with the increase of temperature, while increase with the increasing of strain rate. Thematerial parameters are determined for both Johnson-Cook constitutive equation and modifiedJohnson-Cook constitutive equation. The modified JC equation is more suitable for expressing thedynamic behavior of 7050-T7451 aluminum alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.125.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Restoration of the p16 gene is related to increased radiosensitivity of p16-deficient lung adenocarcinoma cell lines (1998)
    Springer
    Journal of cancer research and clinical oncology 124 (1998), S. 621-626 
    Details
    ISSN: 1432-1335
    Keywords: Key wordsp16 ; Radiosensitivity ; Cell cycle ; Cell line
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To assess the role played by p16 gene expression in the radiosensitivity of human lung cancers, we transferred exogenous p16 genes into p16-deficient H460 and A549 lung adenocarcinoma cell lines and compared the cell survival curve in vitro after irradiation. The surviving fraction of the p16-transfected A549p16 and H460p16 cells that expressed exogenous p16 mRNA or protein was lower than those of the parental and negative control cells. The rapid exit of the p16-transfected cells from the G2/M phase in the cell cycle, both before and after irradiation, possibly contributes to the increased radiosensitivity of our experimental p16-transfected lung adenocarcinoma cell lines. We conclude that exogenous p16 gene may be another important factor controlling the intrinsic cellular radiosensitivity of cancer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004320050224
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  • 10
    Electronic Resource
    Electronic Resource
    An Ni(chitin)2 modified nitric oxide microsensor (1999)
    Springer
    Fresenius' journal of analytical chemistry 365 (1999), S. 587-591 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The development of a simple, sensitive, selective, and stable amperometric nitric oxide microsensor is described. It is based on Ni(chitin)2 mediators immobilized on a platinum, Nafion modified electrode. The detection of NO is based on the Ni(chitin)2 catalysis of NO oxidation at an anodic potential of +0.74 V (vs. SCE). The catalytic peak current is linear for a NO concentration in the range of 8.5 × 10–8 mol/L to 1.5 × 10–5 mol/L, with a correlation coefficient of 0.9992. The detection limit of the microsensor is 5.0 × 10–8 mol/L. It is suitable for the direct measurement of NO in biological systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051527
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