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  • 2005-2009  (20)
  • 1990-1994  (8)
  • 2006  (20)
  • 1991  (8)
  • 1
    Digitale Medien
    Digitale Medien
    Vortex dynamics in oscillatory chemical systems (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 1 (1991), S. 421-434 
    Details
    ISSN: 1089-7682
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Vortex core dynamics is studied in the Brusselator both near to and far from the Hopf bifurcation line for random and pair initial conditions. Extensive simulations are carried out for a pair of counter-rotating vortices close to the Hopf bifurcation line. Provided the vortices are not so far apart that wave-front annihilation produces strong gradients between their centers, the simulation results compare favorably with theories based on the complex Ginzburg–Landau equation. Far from the Hopf line the vortex core dynamics changes character and phenomena such as periodic motion of the vortex centers arise.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.165852
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  • 2
    Digitale Medien
    Digitale Medien
    Molecular cloning of the ViaB region of Salmonella typhi (1991)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 90 (1991), S. 0 
    Details
    ISSN: 1574-6968
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract The ViaB region required for Vi antigen production in Salmonella typhi was cloned. The plasmid pGBM124 containing a 14-kb S. thypi chromosomal DNA fragment conferred the ability to produce Vi antigen on Escherichia coli HB101 and ViaB-deleted S. typhi GIFU10007-3. Tn5 insertion analysis showed that the 14-kb DNA was split into three regions. Region 1 and region 2 are involved in the biosynthesis of Vi polysaccharide. Region 3 is involved in translocation of the Vi polysaccharide to the cell surface. Southern blot hybridization showed that regions 2 and 3 but not region 1, were considerably homologous to the DNA of Vi-positive Citrobacter freundii.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1574-6968.1991.tb05124.x
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  • 3
    Digitale Medien
    Digitale Medien
    Effect of Deep Cryogenic Treatment on Carbide Precipitation and Mechanical Properties of Tool Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 9-14 
    Details
    ISSN: 1662-9779
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Notizen: It is well known that the durability of tool steel could be improved by deep cryogenictreatment. It has been assumed that the increase of service life of tool steel caused by decrease ofretained austenite and/or by formation of nano-scale fine η-carbide. But the principles of deepcryogenic treatment remain unclear yet. In this research, to manifest the effect of deep cryogenictreatment on wear resistance, the specimen was emerged in liquid nitrogen for 20 hours for deepcryogenic treatment after austenitizing and the following tempering temperature was varied. Themicrostructure of specimens was observed using TEM and the mechanical properties and wearresistance were examined. As the tempering temperature increased, the carbides became larger andfine carbides were formed above certain temperature. In the case of deep cryogenic treatedspecimen, the number of carbides increased while the carbides size was decreased, furthermore, thefine carbide forming temperature was lowered also. It was considered that the deep cryogenictreatment increased the driving force for the nucleation of carbides. As tempering temperatureincreased, hardness decreased while wear resistance and impact energy increased. The deepcryogenic treated specimens showed this tendency more clearly. It was considered that the wearresistance is affected not only to the hardness but also to the precipitation of fine carbides, and thiscarbide evolution can be optimized through the deep cryogenic treatment
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.9.pdf
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  • 4
    Digitale Medien
    Digitale Medien
    An Investigation of the Melt-Out and Heat Checking Phenomena in Surface Modified Hot Die Steel for Aluminum Die Casting (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 443-450 
    Details
    ISSN: 1662-9779
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Notizen: For hot die steel, failure is mostly caused by heat checking and melt-out on its surfaceswhich are in contact with molten metals. In the present research, resistances to melt-out and heatchecking of surface modified H13 hot die steels, such as gas nitriding(GN) andmicro-blasting(MB), were investigated. The evaluation of melt-out behavior was carried out bymeasuring the mean depth from the original surface after immersion. To examine the thermalfatigue resistance, a cyclic thermal shock system consisting of induction heating and water sprayquenching was constructed. The value of Lm is proposed as the index representing the susceptibilityto crack initiation and propagation. The melt-out depth was the lowest for the GN treated surface.MB-GN and MB-GN-MB treated specimens also showed good resistance to melt-out. In the case ofGN treatment, while the white layer was completely melted out, the diffusion layer still existedeven after immersion for 43 hours. This implies that nitriding significantly reduced the rate ofmelt-out. From the total crack number, it is seen that crack initiation was reduced to the extent ofhalf after surface treatment. This result means that the residual compressive stress and nitrided layerwere beneficial to crack initiation resistance
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.443.pdf
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  • 5
    Digitale Medien
    Digitale Medien
    Effect of Surface Condition on Melt-Out of Die-Casting Mould (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 509-514 
    Details
    ISSN: 1662-9779
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Notizen: In order to understand the melt-out mechanism of H13 die casting mould material,microstructural investigation was conducted for the immersion-tested surface in Al-alloy melt. Thesurface condition of H13 tool steel was modified by varying nitriding conditions and by surfaceblasting. In particular, long-term behavior of melt-out phenomena during immersion testing of up to43 hours was focused in this article. It was observed that an ion-nitrided H13 surface showed higherresistance towards melt-out than a gas-nitrided or blasted surface. This was related to the surfacelayers that are normally formed by nitriding
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.509.pdf
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  • 6
    Digitale Medien
    Digitale Medien
    Characterization of a Piezoresistive Microcantilever as a Sensor for Detecting the Bio-Molecules (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 1090-1093 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: We propose an electrical detection method for detecting the various bio-moleculeseffectively with microcantilevers. The piezoresistive microcantilevers were fabricated employing surface micromachining technique that has attractive advantages in terms of cost efficiency, simplicity, and ability of fabricating in array. The fluid cell system for injection of bio-molecular solution is fabricated using polydimethylsiloxane (PDMS) and a fused silica glass. The microcantilever is deflected with respect to the difference of the surface stress caused by theformation of self-assembled bio-molecules on the gold coated side of the microcantilever. We confirmed that the deflections occurred by the bio-molecule adsorption and microcantilever can be widely used to a &-TAS and a lab-on-a-chip as a sensor for the potential detection of various biomolecules
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.1090.pdf
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  • 7
    Digitale Medien
    Digitale Medien
    Study on the New Tooth Profile of Silent Chain (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 853-856 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The polygon action and the meshing impact of silent chain can be reduced by the change ofthe link plate structure. However, the change of the link plate structure may result in the complexityof manufacture. A new modified involute profile for sprocket is put forward based on the law ofmotion between the link plate and the driving sprocket. The modified involute profile is obtained byuse of a unified program between VB and AutoCAD. The kinematic and dynamic simulation of silentchain with the new profile is performed by use of ADAMS. The results show that the polygon actionof silent chain mechanism can be reduced and the smoothness of the silent chain drive is effectivelyimproved as the sprocket is of the new modified involute profile
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.853.pdf
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  • 8
    Digitale Medien
    Digitale Medien
    Characteristics of Thin Film of Nano-Hybrid Synthesized from Acrylic Resin and Colloidal Silca-Silane Sol (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 218-221 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Organic-inorganic hybrid blends were prepared in variation with the ratio of sol solution to urethaneacrylic resin. Such sol solutions were synthesized from colloidal silica (CS)/ methyltrimethoxysilane(MTMS)/vinyltrimethoxysilane(VTMS) by sol-gel reaction through two step reactions. Thin films of organic-inorganic hybrid blends were prepared using spin coater on the glass and aluminum sheets. In order to understand surface properties of thin films, contact angle androughness were measured. Surface contact angle and roughness of thin films increased as the amount of sol solution increased. Thermal dissociation temperature of thin films was observed using TGA. Thin films were stable until 270 oC. Thermal dissociation temperature of thin films improved with increasing sol solution. In order to observe insulation property of thin films, electrical resistance measurements were performed. Surface and volume resistance of thin films increased as the amount of sol solution increased
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.218.pdf
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  • 9
    Digitale Medien
    Digitale Medien
    Electrical Properties of the La〈sub〉2〈/sub〉O〈sub〉3〈/sub〉/4H-SiC Interface Prepared by Atomic Layer Deposition Using La(iPrCp)〈sub〉3〈/sub〉 and H〈sub〉2〈/sub〉O (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 527-529 (Oct. 2006), p. 1083-1086 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The La2O3 and Al2O3/La2O3 layers were grown on 4H-SiC by atomic layer deposition(ALD) method. The electrical properties of La2O3 on 4H-SiC were examined usingmetal-insulator-semiconductor (MIS) structures of Pt/La2O3(18nm)/4H-SiC andPt/Al2O3(10nm)/La2O3(5nm)/4H-SiC. For the Pt/La2O3(18nm)/4H-SiC structure, even though theleakage current density was slightly reduced after the rapid thermal annealing at 500 oC,accumulation capacitance was gradually increased with increasing bias voltage due to a high leakagecurrent. On the other hand, since the leakage current in the accumulation regime was decreased forthe Pt/Al2O3/La2O3/4H-SiC MIS structure owing to the capped Al2O3 layer, the capacitance wassaturated. But the saturation capacitance was strongly dependent on frequency, indicating a leakyinterfacial layer formed between the La2O3 and SiC during the fabrication process ofPt/Al2O3(10nm)/ La2O3(5nm)/ 4H-SiC structure
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.527-529.1083.pdf
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  • 10
    Digitale Medien
    Digitale Medien
    The Study of Tool Wear and Breakage Based on the Characteristic Analysis of Acoustic Spectrum (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 197-200 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Tool monitoring is an important factor to restrict the improvement of productionefficiency, machining quality and automation level. The monitoring of the tool wear and breakageconditions on YCM-V116B machining center was studied, and the acquired milling sound signalswere analyzed in detail. By means of the classical time-frequency analysis, it was discovered thatthe wear sound had its own characteristic frequency band, and the frequency component within thefrequency band would change according to the change of wear conditions. So that the frequencycomponent within the frequency band will be a good indicator to monitor the tool wear conditionsexcellently. On the other hand, the tool breakage sound is a random signal that a transient change inamplitude is produced probably when tool breaks. The tool breakage conditions can be detectedexactly by the advantages of wavelet decomposition techniques. The analysis implies that the soundgenerated during the machining process can be used to monitor tool conditions, which provides anew approach to the sound applications in tool monitoring domain
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.197.pdf
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