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  • 2005-2009  (12)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Surface Roughness Prediction Based on Cutting Parameters and Nose Radius in Precision Turning (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 329 (Jan. 2007), p. 539-544 
    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 precision turning, the quality of surface finish is an important requirement formachined workpiece. Thus, the choice of optimal cutting parameters is very important forcontrolling the required surface quality. The focus of the present study is to find a correlationbetween surface roughness and cutting parameters (feed rate, depth of cut) and nose radius inturning 3J33 maraging steel, and to derive mathematical models for the predicted surface roughnessbased on both of cutting parameters and nose radius. The experimental design is carried out usingthe quadratic rotary combination design. The regression analysis shows feed rate and nose radiusinfluence surface roughness significantly. With F-ratio test the proposed model is adequate. Themethod could be useful in predicting roughness parameters as a function of cutting parameters andnose radius
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.329.539.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Improved Stability of Mn-Doped WO〈sub〉3〈/sub〉 Varistor via Doping Cr〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2334-2336 
    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 effect of Cr2O3 addition on the electrical properties and microstructures ofWO3-MnO2 ceramics was studied. The samples were fabricated by the conventional solid phase reactiontechniques. The current-voltage curves and impedance spectra of sintered samples were measured at roomtemperature. The samples without Cr2O3 doping exhibit the max nonlinear coefficient α above 8 in currentregion from 1mA to 10mA and an unstable characteristic of current-voltage curve for repeat measuringcycle, while the samples doped with Cr2O3 display lower nonlinearity with α about 5 and an improvedstability of current-voltage curve at the same conditions. The impedance measurements indicate that theinfluence on electrical properties comes from grain boundary as well as grain. SEM shows the doping ofCr2O3 into WO3-MnO2 ceramics suppresses obviously the growth of WO3, and XRD analysis reveals thecoexistence of WO3 phases with some manganese tungstates and chromium tungstates. The problemsrelated to electrical transporting mechanism were discussed simply
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2334.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    A Fuzzy Set AHP-Based DFM Tool under Concurrent Engineering Environment (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 145-149 
    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: In the light of growing global competition, organizations around the world today areconstantly under pressure to produce high-quality products at an economical price. The integrationof design and manufacturing activities into one common engineering effort has been recognized as akey strategy for survival and growth. Design for manufacturability (DFM) is an approach to designthat fosters the simultaneous involvement of product design and process design. Theimplementation of the DFM approach requires the collaboration of both the design andmanufacturing functions within an organization. At present, For some reasons DFM approach isineffectively including lack of interdisciplinary expertise of designers; inflexibility in organizationalstructure, which hinders interaction between design and manufacturing functions. Design formanufacture is the practice of designing products with manufacturing in mind. Early considerationof manufacturing issues can shorten product development cycle time, minimi overall developmentcost and ensure a smooth transition into production. In this paper, part manufacturability underConcurrent Engineering (CE) environment was analyzed in detail. An evaluation system of DFMwas proposed according to CE ideas. A fuzzy set-based manufacturability evaluation algorithm isformulated to generate relative manufacturability indices to provide product designers with a betterunderstanding of the relative ease or difficulty of machining the features in their designs. Ananalytic hierarchy process (AHP) method is introduced to assign weighting factors to features toreflect their functional importance. Results from the case studies show the method available andpracticable
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/38/transtech_doi~10.4028%252Fwww.scientific.net%252FAMM.10-12.145.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    The Design State Maturity Model for Collaboration between Design and Manufacturing (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 165-171 
    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 traditional series working mode can not make the outcome of product design processverified by activities of manufacturing domain in time, and the manufacturing process can not beexecuted concurrently. The purpose of this paper is to develop a method to solve the problemmentioned above. The connotation of the collaboration between design and manufacturing isstudied firstly, and then the design state maturity model (DSMM) is proposed in this paper. Sixlevels of maturity are defined in this model, and every level can support the collaboration betweendesign and manufacturing in different degree. Based on the design information required in themanufacturing process, the information included in each level is studied and particularized. Finally,the DSMM-based work process of collaboration between design and manufacturing is studied
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/38/transtech_doi~10.4028%252Fwww.scientific.net%252FAMM.10-12.165.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    An Integrated Approach for the Realization of the Real-Time Control in Electro-Hydraulic Servo System (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 513-517 
    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: In industrial practice, for the designers and researchers of the electro-hydraulic servosystem, it is desirable to boost the reliability of controllers, to shorten the design cycle of controlalgorithms, to simplify the modification of control algorithms during experiments and to shortentraining period for operators. In this paper, we present a new, complete and integrated method basedon the rapid control prototyping for the real-time digital control applied in electro-hydraulic servosystem. The approach uses a collection of tools that include both software (LabVIEW and Matlab)and hardware (a host industrial computer and a target developed digital signal processor controller).An application example of the methodology, synchronous loading test system based on artificialneural networks, completes the discussion about the performance of the designed system
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/38/transtech_doi~10.4028%252Fwww.scientific.net%252FAMM.10-12.513.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Surface Topography Characteristics in Ultrasonic Aided High Speed Lapping of Engineering Ceramics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 53-54 (July 2008), p. 273-278 
    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: Because of its high machining efficiency and good machining quality, ultrasonic aidedhigh-speed lapping with solid abrasive is regarded as a good method of cylindrical machining forengineering ceramics. Compared with conventional lapping, ultrasonic aided high speed lapping hasunique surface topography distribution characteristics for the difference of the surface formationmechanism and material removal mechanism. In the paper, the surface topography characteristics ofengineering ceramics in different lapping mode were researched. Research results show that thelapped surfaces with and without ultrasonic assistance present different surface topographycharacteristics. Under the same lapping mode, the lapped surface topography is distinctly different fordifferent ceramics. With the assistance of ultrasonic vibration, more ductile material removal can beobtained and the surface quality can be improved correspondingly
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.53-54.273.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Novel insertion sequence-like elements in phytoplasma strains of the aster yellows group are putative new members of the IS3 family (2005)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 242 (2005), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Novel insertion sequence (IS)-like elements were isolated and characterized from phytoplasma strains in the aster yellows (AY) group (16SrI). The IS-like elements were cloned from phytoplasma strains AY1 and NJAY or PCR-amplified from 15 additional strains representing nine subgroups in the AY group using primers based on sequences of the putative transposases (Tpases). All IS-like elements contained sequences encoding similar Tpases of 321 amino acids (320 for strain CPh). Substantial amino acid sequence variability suggested multiple species of Tpases or IS-like elements exist in the AY phytoplasma group. These Tpases have an identical DDE motif that is most similar to the DDE consensus of Tpases in the IS3 family.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsle.2004.11.036
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  • 8
    Electronic Resource
    Electronic Resource
    Pilot study of topical delivery of methotrexate by electroporation (2005)
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 152 (2005), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background  The topical administration of methotrexate (MTX) for the treatment of psoriasis and neoplastic diseases is restricted by the poor diffusion of MTX across the stratum corneum.Objectives  We applied electroporation to increase the transdermal transport of MTX.Methods  Electrodes were placed either side-by-side on the surface of excised full thickness pig skin, or on a piece of skin clamped between compartments of a vertical diffusion chamber. Sixty rectangular electric pulses at 120 V, 1 ms and 1 Hz were applied across the skin. MTX was left on the skin surface for an additional 10 min to take advantage of diffusion through electropores. Cumulative drug transport was measured by radioactive tracing, using [3H]-methotrexate, from punch biopsy samples taken from under the cathode. The integrity of the radioisotope was verified by high-performance liquid chromatography.Results  Using side-by-side electrodes, treatment with the pulses alone resulted in a 2·5-fold increase; adding anionic lipid enhancers to the pulses resulted in a 4·4-fold enhancement compared with passive diffusion. Concurrent iontophoresis for the 11-min time period made a nonsignificant contribution. To reduce tissue resistance we used 40 °C hyperthermia in a vertical diffusion chamber; transport was increased 11-fold to 53 µg cm−2 (flux = 290 µg cm−2 h−1). MTX penetration profiles indicated that more than half of the MTX was confined to the epidermis and papillary dermis. The tissue concentration in this superficial reactive unit was 1·7 mmol L−1.Conclusions  Electroporation of MTX with an anion lipid enhancer under a mild hyperthermic environment provided a significant transdermal delivery within a short application time. The method may be an effective means of drug delivery for treating psoriasis or other MTX-sensitive disorders and avoids the potential systemic toxicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.2005.06455.x
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  • 9
    Electronic Resource
    Electronic Resource
    Yield Strength of α-Silicon Nitride at High Pressure and High Temperature (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Through the analysis of peak broadening of energy-dispersive diffraction lines from a powdered sample, the yield strength of α-Si3N4 was investigated at a pressure of 9 GPa and temperatures up to 1234°C. During compression at room temperature, the lattice strain deduced from peak broadening increased linearly with pressure up to 9.2 GPa, with no clear indication of strain saturation. While heating at 9 GPa, diffraction peaks narrowed and significant stress relaxation was observed at temperatures above 400°C, indicating the onset of yielding. The yield strength of α-Si3N4 decreases rapidly with increasing temperature: from 8.7 GPa at 400°C to 4.0 GPa at 1234°C. The low temperature for the onset of yielding and decrease of yield strength upon further heating bring up concern regarding the performance of α-Si3N4 as an engineering material. Finally, the grain size variation is also outlined together with the dependence of differential strain on pressure and on temperature. This provides crucial information for clarifying the “fine structure” of the evolution of the differential strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00163.x
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  • 10
    Electronic Resource
    Electronic Resource
    Phase Changes in Fe-Si Powder Mixtures by Mechanical Alloying and Subsequent Heat Treatment (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1709-1712 
    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 the present study, Fe and Si powders (3:1 in atomic proportion) were mechanical alloyed and subsequently treated under different anneal conditions. The changes of phase composition and structure during the mechanical alloying and following heat treatment processes were mainly studied. The results showed that the XRD peaks of Fe were gradually broadened and weakened with theincrease of the milling time associated with the shifting from low angles to high angles, and the main phase changed into α-Fe (Si) solid solution after milling for 20h. When the product was heat treated below 400oC, the main phase remained α-Fe (Si). While it was treated above 400oC, ordered Fe3Si phase was found and the XRD peaks of Fe3Si became sharper with the further increase of the temperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1709.pdf
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