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  • 1
    Electronic Resource
    Electronic Resource
    Structural and Electronic Factors in Heterolytic Cleavage: Formation of the Co(I) Intermediate in the Corrinoid/Iron-Sulfur Protein from Clostridium thermoaceticum (1995)
    s.l. : American Chemical Society
    Biochemistry 34 (1995), S. 5269-5273 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00015a042
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  • 2
    Electronic Resource
    Electronic Resource
    Study of Biodegradation of Pure Magnesium (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 601-604 
    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: Magnesium and its alloys are possible to develop new type of biodegradable medicalmagnesium alloys by using their active corrosion potential. The bio-corrosion properties of the highpure magnesium in the Hank’s solution were investigated in this paper, the results showed that highpure magnesium had a low corrosion rate and hydrogen release in Hank’s solution, when the pH valueof solution was controlled at 7.5, the corrosion rate was under 0.2mm/year, the production of hydrogenwas about 0.15ml/cm2, and if the solution wasn’t controlled on pH value, the corrosion rate was about0.02 mm/year, production of hydrogen was about 0.1ml/cm2 . Result of in vitro Kinetic clotting timetest and animal implant prep-test showed that High pure magnesium had good thromboresistantproperty and tissue compatibility, pure magnesium can biodegrade lowly in animal body and formedsurface apatite, which proportion of Ca/P was similar with bone tissue
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.601.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    The Design of Self-Adjusting Delivering Warp Mechanism in Knitted Carpet Weaving Equipment (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 271-275 
    Details
    ISSN: 1662-7482
    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 tension of warp and weft run through the whole weaving process in knitted carpetweaving equipment. The performance of delivering warp mechanism and guiding weft mechanismin this kind of equipment influences the quality of carpet directly. A self-adjusting delivering warpmechanism is designed in this thesis, which is used in knitted carpet weaving equipment or othertextile equipment that delivers warp by warp-spindle and demands even warp tension. Theself-adjusting delivering warp mechanism consists of the device for setting and detecting warptension, the device for driving warp-spindle in different speed, and the device for transmittingwarp-spindle movement. The device for setting and detecting warp tension can determineinitialization tension of warp, according to the technical requirements, can detect and feed backwarp tension in real time. The device for driving warp-spindle in different speed makes the rotatingspeed of warp-spindle change according to the warp tension. The self-adjusting delivering warpmechanism realizes the function on controlling the rotating speed of warp-spindle in closed loop,and on stabilizing delivering warp tension
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/38/transtech_doi~10.4028%252Fwww.scientific.net%252FAMM.10-12.271.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure and Grain Abrasion Properties of TiC-xNi Coatings Prepared by Electro-Thermal Explosion Ultra-High Speed Spraying (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 489-494 
    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: In this work, a new method, electro-thermal explosion ultra-high speed spraying (EEUSS),was utilized to synthesize the titanium carbide based and nickel bonded (TiC-xNi) coatings. Thenickel content was varied at the weight percents of 5, 10, 15 and 20%. The microstructure andproperties of the coatings were studied by means of scanning electron microscope (SEM), X-raydiffraction (XRD) and microhardness tester, respectively. The TiC-xNi coatings had the metallurgicalbonding with the substrate, and consisted of submicron grains. The grain abrasion tests resultsshowed that the abrasion resistance of the coatings was affected by the contents of Ni
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.489.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Erosion Behavior of TiC-xNi Composite Coatings 〈i〉In Situ〈i〉 Synthesized by Electro-Thermal Explosion Ultra-High Speed Spraying (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 1277-1282 
    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: With aim to investigate the effect of the content of Ni on erosion behavior of the TiC-xNicoating at elevated temperatures, The TiC-xNi (x=0, 5, 10, 15 , 20wt.%) composite coatings werein-situ synthesized on nickel-based alloy substrate by the self-developed electro-thermal explosionultra-high speed spraying (EEUSS) device with the cored wire. Erosion properties of the coatingswere assessed by the erosion tester under 90° incidence angle and 650°C. X-ray diffraction (XRD)and microhardness tester were used to investigate the coating phases and microhardness. The coatingsconsisted of TiC phase and Ni binder phase, as well as the residual C. The microhardness of TiC-xNicoating with the Ni content from 5 wt.% to 20wt.% decreased with the increase of the content of Ni.Elevated temperature erosion test indicate that the spiculate quartz particles impact the surface of thecoating which lead to the loss of material. The erosion resistance of the TiC-xNi coatings increasedfirst and decreased afterwards with the increase of the content of Ni. The relative erosion resistance ofcoating with 10 wt.% Ni addition is excellent which is about 2 times than that of TiC-20Ni coatingunder 650°C and 90° incidence angle
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.1277.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental Research on Crack Propagation in U71Mn and U75V Rail Steels (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 807-810 
    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 this paper, the continuous in-situ observations of the fatigue crack growth in U71Mn andU75V rail steel are made by using the scanning electronic microscope (SEM). The microstructurepatterns of cracks under the mode I fatigue loads and quasi-static loads are presented. The resultsindicate that the short fatigue crack growth in rail steel is a quasi-cleavage fracture. The ductility andthe performance of fatigue resistance of U71Mn rail steel are better than those of U75V rail steel
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.807.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Automatic Polishing of Super Accuracy Mirror Mold with Free-Form Surface by Curvature Analysis (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 505-507 (Jan. 2006), p. 547-552 
    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: This paper proposed a polishing path planning method of super accuracy mirror mold with free-form surface by curvature analysis. First, IGES files of free-form surfaces are read and the mold geometry is regenerated as B-spline surface by the Automatic Mold Polishing System (AMPS). By using the derivative properties of B-spline surface, normal vector and principal curvatures at any point of the surface are calculated. In addition, the effective contact width between polishing tool and mold surface based on the grain size and the principal radii of curvature is also determined. The minimum contact width in 3-D is mapped onto the (u, v) parameters of B-spline surface. Then a modified Peano fractal path with weaving function is calculated based on the effective contact width in the (u, v)coordinate. This Peano-weaving path was tested on an optical mold with free-form surface. The polishing result shows the method is very effective and achieves the level of mirror surface with roughness Ra 29nm
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.505-507.547.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Study on Interface Reactions between Nb-Si System In Situ Composite and Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1495-1500 
    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: A Nb-Si system in-situ composite Nb-16Si-24Ti-6Cr-6Al-2Hf(at%) was fabricated usingvacuum arc melting method, and then was metallurgically reacted with four kinds of ceramics ZrO2,Y2O3 stabilized ZrO2, Y2O3, SiC+Si3N4 at elevated temperature. The microstructures in the interfacereaction zones were investigated by SEM and EDS. The results showed that different extent chemicalreactions between the composite and these four kinds of ceramics took place. It has been found thatHfO2 riched layer formed near the interfaces between the Nb-Si in-situ composite and three ceramicsof ZrO2, Y2O3 stabilized ZrO2 and Y2O3, and thickness of the reaction zones were about 100μm,10μm, 1μm respectively. C and N elements in SiC+Si3N4 ceramic diffused to the composite atelevated temperature, and a new phase that rich of Ti, C and N elements appeared nearby the interfaceand accumulated inhomogenously. It may be concluded that the interface reactions of both ZrO2 andSiC+Si3N4 with Nb-Si composite were very violent, therefore they are not suitable as face-coatmaterials of shell molds for investment casting; the interface reaction of Y2O3 stabilized ZrO2 andNb-Si composite was slighter than ZrO2 and SiC+Si3N4, and it can be used as face-coat material ofshell molds, the interface reaction of Y2O3 and Nb-Si composite was very slight, and is recommendedas an ideal face-coat materials of shell molds
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1495.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Fracture Analysis on the Interface Crack of Concrete Gravity Dam (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 267-270 
    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: Some numerical parameters-sensitivity analysis has been conducted to evaluate thestability and propagation of the interface cracks at heel of concrete gravity dam. In this paper,utilizing the software ANSYS to simulate the stress and displacement fields of the tip of theinterface cracks between concrete gravity dam and foundation, the stress intensity factor (SIF) ofthe interface crack is analyzed using facture mechanics. Three impacting factors have beendiscussed, such as the crack length, the angle of crack, and the water height. Critical length andloads of interface crack propagation are obtained using composite fracture criteria. The resultsindicate that the coarse interface retards the propagation of interface crack, and redounds to stabilityof gravity dam. It is found that the interface crack often propagates alone the interface between damand foundation, simultaneously the branch crack kinks to foundation at the specific condition
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.267.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    The stretching vibrational overtone spectra of PH3: Local mode vibrational analysis, dipole moment surfaces from density functional theory and band intensities (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 7018-7026 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The infrared spectra of PH3 molecule were recorded on a Bruker IFS 120HR Fourier transform spectrometer from 4000 to 9500 cm−1. The P–H stretching vibrational frequencies and intensities were derived from the experimental data. The Morse oscillator parameters De and α in the anharmonically coupled anharmonic oscillator local mode model were determined by the least-squares fitting with the observed vibrational band centers. The ab initio three-dimensional P–H stretching dipole moment surfaces were calculated by the density functional theory method. The dipole moment vectors were projected to three kinds of molecule-fixed reference systems. The corresponding dipole moment components were fitted to polynomial functions in terms of the P–H bond length displacements with the molecular symmetry taken into account. The absolute band intensities were obtained and then compared with the experimental data. The results showed that a proposed improved bond dipole model can predict the absolute band intensities within a factor of 2 for most of the observed transitions, indicating a reasonably good agreement. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1352038
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