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  • 1
    Electronic Resource
    Electronic Resource
    A Study on the Grinding Temperature Field for Titanium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 339 (May 2007), p. 45-49 
    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 reasonable finite element (FE) model of grinding temperature field has been developedon the basis of analysis of the transient temperature field， and three kinds of boundary conditionsare loaded on the element of a moving heat source. The study, which is based on the finite elementprinciple, has been carried out using the numerical simulation software ANSYS. Many results havebeen obtained including three dimensional temperature distribution map. The simulated resultsunder different conditions show good agreement with the experimental results. With the comparisonof the dry-grinding and wet-grinding, the result shows that the wet-grinding temperature with aproper grinding fluid is rather lower than the dry-grinding temperature. Finally, the variablecoefficient of convective heat transfer and the different form heat source have been discussed indetail
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.339.45.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of Silver Nanostructures on Fluorescence Modulation of Rhodamine B and Fluorescein (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 920-923 
    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: We described a facile approach to controllably synthesize silver nanoparticles withvarious morphologies using N, N-dimethylformamide (DMF) in the presence of poly (vinylpyrrolidone) (PVP). Triangular/hexagonal nanoplates, chain-like nanoplate assemblies, andnanobelts could be selectively obtained. On the basis of the experimental results, the concentrationof poly (vinyl pyrrolidone) and AgNO3, reactive temperature and time were the vital factors todetermine the shape of final products. Reasonable mechanisms for the formation of silvernanoparticles with various morphologies were proposed. Fluorescence modulation of dyerhodamine B (RhB) and fluorescein (FI) in the presence of silver nanoparticles were studied.Addition of silver nanoparticles could produce fluorescence enhancement and show self-quenchingrelease of RhB, while the fluorescence intensity of FI decreased due to the presence of the silvernanoparticles. The effects of silver nanoparticles on the fluorescence properties of dyes weredependent on the competition between the local field enhancement and non-radiation energytransfer from the molecule to the metallic nanoparticles
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.920.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    A Study of Double Sided Polishing Process for Ultra-Smooth Surface of Silicon Wafer (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 472-475 
    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: Double sided polishing process has become a main machining method for silicon waferfinishing process, but it is difficult to get ultra-smooth surface with the very stringent machiningconditions. In this paper, the mechanism of ultra-smooth surface machining process was studied, themain parameters affecting the surface quality of silicon wafer, such as the polishing pad and carrierrotation speed, polishing press, polishing slurries etc. , were discussed and optimized, thenultra-smooth surface of silicon wafer with Ra 0.4nm has been obtained based on the above study. Anew double sided polishing machine with computer control system equipped with a digitalcontrolled press valve was developed, and the ultra-smooth machining process of silicon wafer wasestablished in this paper
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.472.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    The Development of the Precise Double Sided Polishing Machine (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 315-316 (July 2006), p. 375-379 
    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 functional materials such as sapphire, silicon wafer etc. are processed efficientlywith ultra-smooth surface for the demand of the rapid development of the IC industry. The precisedouble sided polishing process is one of the main methods of getting the ultra-smooth surface forthese materials. This paper introduces the structure and characteristic of the precise double sidedpolishing machine with a precise pressure control system equipped a new type electro-pneumaticdigital servo valve. The works, such as machine design, development of the control system andoptimization of process parameters etc. are carried out to meet the requirement of the precise doublesided polishing machining process. This equipment has the characteristic of high machiningprecision and precise control capability, so it can be applied to the ultra-precise machining of theultra-thin sapphire, silicon wafers etc
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.315-316.375.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Rapidly solidified Fe–6.5%Si alloy powders for high frequency use (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5489-5489 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe–(3∼6.5%) Si alloy powders having a high magnetic induction (Bs) and a low core loss value for high frequency use were obtained by an extractive melt spinning as well as a centrifugal atomization technique. Sintered core rings made by the rapidly solidified Fe–6.5% Si powders exhibited the high frequency electromagnetic properties: saturated induction (B8) of 1.23 T, coercivity (Hc) of 9.5 A/m, relative permeability (μa) of 6321, and core loss (W10/50) of 1.27 W/kg from the rings of 1.1 mm thick. The saturated induction values were found to be almost identical to those of nonoriented Fe–3% Si steel sheet and 6.5% Si sheet prepared by the CVD technique. The high frequency core loss values were measured not to be changed much up to 10 kHz (W1/10k=55 W/kg) in applied ac frequency. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362285
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  • 6
    Electronic Resource
    Electronic Resource
    Developmental and dietary induction of the 90K subunit of rat intestinal phytase
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/General Subjects 1075 (1991), S. 83-87 
    Details
    ISSN: 0304-4165
    Keywords: (Rat intestine) ; Dietary induction ; Phytase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0304-4165(91)90078-U
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  • 7
    Electronic Resource
    Electronic Resource
    A Study on Computer Simulation of Plastic Lens Molding Process (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 471-472 (Dec. 2004), p. 490-493 
    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: In this paper, some molding process parameters such as injection time, packing time,packing pressure and process temperature etc. were optimized by the Computer Aided Engineering (CAE) simulation (Moldex 3D) for injection molding of a plastic lens. Some experimental trials were carried out for verifying of the CAE simulation results with checking of the lens shrinkage and birefringence etc. as well. The results showed that, the recommended molding process parameters from CAE simulation and the actual experiments were almost the same, hence the CAE is aestablished tool based on the scientific approach to reduce experimental works, to identify critical parameters and to save substantial costs. Lately, a perfect plastic lens was gained by the Injection–Compression Molding process with the optimized process parameters by a CAE simulation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.471-472.490.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Application of the Electrical Discharge Truing Technique on the Lapping Machining Process (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 304-305 (Feb. 2006), p. 94-98 
    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 discussed the principle about the Electrical Discharge Truing(EDT)technique ,which applied in lapping machining process, including EDT status with different environment and machining conditions, and an EDT equipment on a lapping machine have been developed and used in the experiment of EDT. Then some experiments were carried out for verifying of the EDT effect with different EDT parameters such as electric voltage, EDT gap, and the EDT media. Finally, the efficient and precision EDT was achieved with the suitable EDTparameters
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.304-305.94.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    High Temperature Low-Cycle Fatigue, Deformation Microstructure and Final Fracture Behavior of a Nickel-Base Superalloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 378-379 (Mar. 2008), p. 249-270 
    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: The low-cycle fatigue (LCF) properties of a nickel-base precipitation-strengthenedsuperalloy (GH4145/SQ), obtained at a temperature of 538 o C, were reported and discussed in thispaper. The properties investigated include cyclic stress response, fatigue life, deformationmicrostructure and final fracture features as a function of applied strain amplitude. It was shownthat the alloy exhibited a pronounced initial hardening followed by continuous softening to failureat high plastic strain amplitudes ( 〉 0.2% ap ε ), while at low plastic strain amplitudes ( 〈 0.2% ap ε )the initial hardening was followed by a well-defined saturation stage. Bilinear behavior with achange of slope at a plastic strain amplitude of about 0.2% was observed in the cyclic stress-strain(CSS) and Coffin-Manson (C-M) plots. TEM observations revealed that slip band density increasedwith increasing total strain amplitude and precipitate degradation resulting fromdislocation-precipitate interactions took place with continuous cyclic straining. The change in themicrostructure during cycling is thus responsible for the fatigue hardening / softening behavior ofthe alloy. SEM examinations indicated that at low plastic strain amplitudes ( 〈 0.2% ap ε ) crackpropagation was basically transgranular, while at high plastic strain amplitudes ( 〉 0.2% ap ε ) crackpropagation exhibited intergranular features, as a whole. The variation in both the number ofoperating slip systems and the fracture modes with the strain amplitude employed was used toexplain the observed two-stage LCF behavior of the present investigated superalloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.378-379.249.pdf
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  • 10
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    Catalytic oxidation of Li2S on the surface of metal sulfides for Li−S batteries (2017)
    National Academy of Sciences
    Details
    Publication Date: 2017-01-17
    Description: Polysulfide binding and trapping to prevent dissolution into the electrolyte by a variety of materials has been well studied in Li−S batteries. Here we discover that some of those materials can play an important role as an activation catalyst to facilitate oxidation of the discharge product, Li2S, back to the charge product, sulfur. Combining theoretical calculations and experimental design, we select a series of metal sulfides as a model system to identify the key parameters in determining the energy barrier for Li2S oxidation and polysulfide adsorption. We demonstrate that the Li2S decomposition energy barrier is associated with the binding between isolated Li ions and the sulfur in sulfides; this is the main reason that sulfide materials can induce lower overpotential compared with commonly used carbon materials. Fundamental understanding of this reaction process is a crucial step toward rational design and screening of materials to achieve high reversible capacity and long cycle life in Li−S batteries.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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