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  • 1
    Electronic Resource
    Electronic Resource
    Fabricating Nanofluidic Channels and Applying them for DNA Molecules Study (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 777-780 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In the emerging field of nanobiotechnology, further downsizing the fluidic channelsand pores to the nanometer scale are attractive for both fundamental studies and technicalapplications. The insulation Silicon nitride membrane nanofluidic channel arrays which havewidth ~50nm and depth ~80nm and length ≥20μm were created by focused-ion-beam instrument.The λ-DNA molecules were put inside nanochannels and transferred, a fluorescence microscopywas used to observe the images. Only by capillary force, λ-DNA molecules moved inside thenanochannels which dealt with activating reagent Brij aqueous solution. These scope nanostructuredevices will help us study DNA transporting through a nanopore and understand moreDNA dynamics characteristics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.777.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Detection of Grinding Surface’s Quality Based on Image Technique (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 359-360 (Nov. 2007), p. 499-503 
    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: Aiming at different grinding surfaces of hardened bearing steel GCr15, this paper madeexperimental research on detection method of surface roughness based on image technique.Adopting cold light source and five kinds of LED light sources, such as low-angle light, collimatedlight and coaxial light, we analyzed image characteristics of grinding surface under differentprocessing conditions and found that there was a good correlation between standard deviation ofgray variance and roughness of grinding surface. In comparison with the results from traditionalsurface roughness measuring instrument, we gained the corresponding relation between differentgrinding surface roughness and standard deviation of image gray variance. It was proved bycalculating that they have a good correlativity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.359-360.499.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of the Axial Tensile Properties of Multidirectional Filament Wound Tubes (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 375-376 (Mar. 2008), p. 107-112 
    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: This paper studied the axial tensile properties of the multidirectional filament woundtubes (MFWT) both theoretically and experimentally. Based on the Classical Laminate Theory, themechanical analysis model of the tubes was established and implemented by the program of Matlablanguage, from which the axial tensile strength was predicted. Then the specimens with differentparameters were fabricated and tested under axial tensile load respectively. The theoretical modelmet the experimental results well. Furthermore, the test results, the stress-strain curve and thefailure form were analyzed, which showed that the axial properties of the MFWT were obviouslystrengthened with the incorporation of the axial reinforcement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.375-376.107.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental Research on Orthogonal Cutting and Oblique Cutting of Hardened Steel GCr15 (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 375-376 (Mar. 2008), p. 192-196 
    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: Experiment of hard cutting GCr15 with PCBN cutting tools, the influence of tool’sinclination angle and cutting parameters (cutting speed and feed speed) on cutting forces and cuttingtemperature are studied. A three-dimensional finite elements model using the commercial softwareDeform 3D 5.03 is developed. The friction between the tool and the chip is assumed to follow amodified Coulomb friction law and the adaptive remeshing technique is using for the formation ofchip. The workpiece material property is a function of temperature, strain, and strain rate in theprimary and secondary shear zones. Finite element method is used to simulate three-dimensionalprecision cutting, including orthogonal cutting and oblique cutting. The cutting forces and backforces are slightly changed by tool’s inclination angle. However, in high cutting speed, the cuttingforce decrease as the tool’s inclination angle increase, while the cutting temperature increase as thetool’s inclination angle increase. The simulation results are compared with experimentally measureddata and found to be in good agreement to some extent
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.375-376.192.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Study on Alkyd-Based Electrically Conductive Coatings (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 869-872 
    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: Carbonaceous fillers have been widely applied in electrically conductive coatings due to their cheaper, steady electrically conductive capability and other excellent performances. Electrically conductive coatings were synthesized by using graphite and carbon black as fillers in the alkyd resin matrices. Influences of various fillers on electrical conductivity of coatings have been investigated in detail
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.869.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental Study on Fatigue Crack Growth in a Titanium Alloy (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 2489-2494 
    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 series of test for the fatigue crack growth rate da/dN and the threshold ΔKth values were performed with CT specimens on a ship-condenser material titanium alloy plate and rolled ring. Base metal, welded joint and HAZ (heat affected zone) materials were used to make different test specimens. Specimens made from the titanium plate were cut along L-T direction, those made from rolled ring were obtained along C-R and L-R direction respectively. Results show that the fatigue crack growth rate value of welded joint is much higher than those of base metal and HAZ material. The da/dN values of C-R direction specimens are much higher than those of L-R direction specimens, whereas the ΔKth values are lower. It means that welding process may lead to a great reduction in the fatigue property for titanium alloy and the effect of crack orientation on fatigue property is not negligible for titanium alloy. To select a proper orientation of titanium material is therefore very important in engineering practice. Results also indicate that a simplified method can be used to calculate the ΔKth values for titanium material, that is, ΔKth values may be calculated directly from the da/dN expression in a zone near the threshold and the laborious measurements of ΔKth may therefore be saved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.2489.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Silicon Nitride/Boron Nitride Composite by Combustion Synthesis (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 531-534 
    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: Machinable silicon nitride/ hexahedral boron nitride (Si3N4/h-BN) composites were in-situsynthesized in a nitrogen (N2) atmosphere by means of combustion synthesis gas-solid reaction withsilicon (Si) powder and h-BN as raw materials. The effect of the volume fraction of h-BN on themachinable properties of Si3N4/BN composite was studied. The results show that Si powder was fullynitrified and no residual Si was found. Microstructures by a scanning electron microscopy (SEM)show Columnar crystals of β-Si3N4 are the main phase and acicular crystals of h-BN disperse β-Si3N4intergranular. With the increasing of the volume content of h-BN, the machinability of the compositeincreases, but the bending strength of composite decreases firstly and then increases. The lowestbending strength is 84.96MPa at 25% volume fraction of h-BN
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.531.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    The Influence of Acrylic Acid Groups on the Microstructure of HDPE/PS/Clay System Studied by Positron Annihilation (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 607 (Nov. 2008), p. 88-90 
    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: Two types of composites－high density polyethylene/polystyrene (HDPE/PS) with clay, and high density polyethylene grafted with acrylic acid/PS (PEAA/PS) with clay－were prepared via melt compounding. X-ray diffraction (XRD) results revealed that the dispersion of clay in compatibilized blends was better than immiscible blends. Positron annihilation lifetime spectroscopy (PALS) has been utilized to investigate the microstructure of two types of composites. The ortho-positronium (o-Ps) intensity for PEAA/PS was lower than that for HDPE/PS. The results provided evidence that the chain segments with carboxyl group would be easier to intercalate the gallery of silicates
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.607.88.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Controlled Crystallization of Tooth-Like Hydroxyapatite under Gelatin Monolayer (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 663-666 
    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: Based on the molecular recognition theory, an organic molecules model was designed toinduce the hydroxyapatite crystallization, to build a tooth-like calcium phosphate/hydroxyapatiteunder a controllable way in vitro. The cross-linking of collagen on the dentin surface and gelatin wasoptimized by varying the molar ratio of N,N-(3-dimethylaminopropyl)- N'-ethyl-carbodiimidehydrochloride (EDC) and N-hydroxysuccinimide (NHS) at a constant EDC concentration. CaCl2 andNa3PO4-12H2O solutions were added after the crosslinking process. The whole process requiresrepeating the crosslinking and mineralization process for five times. The obtained composite werecharacterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) as well as energydispersive X-ray photoelectron spectroscopy (XPS). The results showed that the dentinal tubule wereblocked by neonatal hydroxyapatite layer which has a continuous structure of columns crystal withsize of 10-40nm. Furthermore, there was column crystal with parallel direction inside, similar to thecrystal array in the top of enamel rod. This study showed that the specific organic molecule model canbe used as a potential effective crystal growth modifier
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.663.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Growth of Calcium Phosphate on Poled Piezoelectric Poly-L-lactic Acid Membrane by a Biomimetic Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 703-706 
    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 bioactivity of poled piezoelectric PLLA membrane was investigated by studying thecalcium phosphate formation in vitro using a biomimetic method. Samples (φ10mm) were poledunder DC electric field of 8~l0kV/cm at 70°C for 30 min followed by cooling under the electric field.Surface chemistry of the samples before and after poling treatment was studied by X-rayphotoelectron spectroscopy (XPS). Poled/unpoled samples were immersed in supersaturatedcalcification solution (SCS) for periods up to 24 h (36.5℃). The surface morphology and compositionof the soaked samples were evaluated by using scanning electron microscope (SEM) and X-raydiffraction analysis (XRD). Poled samples showed two different charged surfaces, negatively-chargedsurface (N-PLLA) and positively-charged surface (P-PLLA). On the N-PLLA surfaces, SEM togetherwith XRD showed a gradually formed calcium phosphate (Ca-P), while no obvious Ca-P on eitherP-PLLA or unpoled samples was observed. This study demonstrated that poled piezoelectric PLLAsubstrates induce substantially higher level of Ca-P formation than electrically neutral substrates andonly N-PLLA, however, can improve Ca-P formation after immersion in SCS
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.703.pdf
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