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  • 1
    Electronic Resource
    Electronic Resource
    Change of Mechanical Properties of FM Steels after Thermal Aging (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1413-1416 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The effects of thermal aging on microstructural evolution and mechanical properties areimportant in the understanding of the in-service behavior of ferritic/martensitic steels in advancednuclear power system. Ferritic/martensitic steels have been aged at 600oC for times up to 20,000 hrs.The change of mechanical properties has been examined for these aged materials. The strength andhardness was hardly changed after the thermal aging at 600oC for 20,000 hrs in all specimens. Theimpact absorbed energy decreased with the aging time. But the decrease of the impact absorbedenergy was larger at the early stage of aging in tungsten added steels. This is attributed to theformation of Laves phase. Nitrogen which is known to increase the creep rupture strength had noeffect on the degradation of the microstructure and mechanical properties during thermal aging
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1413.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of Nano M〈sub〉2〈/sub〉X Particles by a Tempering in High Cr Ferritic/Martensitic Steel (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 135 (Feb. 2008), p. 107-110 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The precipitation of nano Cr2N particles in high Cr FM steels has been studied. Thenitrogen content of the FM steels was changed to form stable Cr2N particles. Tempering temperaturewas also changed from 500 oC to 800 oC to study the precipitation behavior of the Cr2N particles withthe tempering temperature. The Cr2N particles remained as a stable phase at a higher temperingtemperature by increasing the nitrogen content. The shape of these particle was a fine needle typewhich was very similar to V(C,N) particles. The size of some Cr2N particles was increased as thenitrogen content increased. But these precipitates were not dissolved or largely coarsened during acreep deformation at 600°C. So it seems that they may act as an effective obstacle against adislocation glide during a creep deformation, thus contribute to an increase of the creep rupturestrength in high Cr FM steels
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.135.107.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Radiolytic Synthesis of Hybrid Silver Nanoparticles and their Biobehavior (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 897-900 
    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 hybrid Silver(Ag) nanoparticles were synthesized by gamma-irradiation, andcharacterized by field-emission transmittance electron microscopy (FE-TEM), field-emissionscanning electron microscopy (FE-SEM), and energy dispersive X-ray spectroscopy (EDXS). Theelectron microscopy images show that well-dispersed Ag nanoparticles of about 3-7 nm wereloaded to the outer and inner side of SiO2 nanoparticles of about 5-30 nm. Antifungal efficiency ofthe hybrid nanoparticles was tested against Aspergillus flavus ATCC 64025, Aspergillus fumigatusATCC 16424, Aspergillus terreus ATCC 46941, Candida albicans ATCC 10231, Candida albicansA207(clinical isolate), Candida glabrata ATCC 48435, Candida krusei ATCC 6258, Candidalusitaniae ATCC 42720, Candida parapsilosis ATCC 34136, Candida tropicalis ATCC 13803,Cryptococcus neoformans ATCC 36556, and Mucor ramosissmus ATCC 90286. At the presence ofhybrid Ag nanoparticles at 1 ppm, they did not grow fully even after 58 hrs except for Cryptococcusneoformans ATCC 36556. The hybrid Ag nanoparticle can be used for antifungal agents
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.897.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of SPS on Surface Characteristics of Gas-Atomized Mg-6wt%Al-1wt%Zn Alloy by Non-Hazardous PEO Treatment (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 569 (Jan. 2008), p. 333-336 
    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: The Mg-6wt%Al-1wt%Zn alloy powders mixture produced by gas atomization were sparkplasma sintered (SPSed). The SPSed sample was coated by plasma electrolytic oxidation (PEO)method, and the microstructure, mechanical and corrosion properties were investigated and comparedto the normally sintered sample. The SPSed sample exhibited a microstructure of well-bonded grainswith approximately 48 ,m in grain size, which was bigger than that of the normally sintered sample.The coatings on the SPSed sample were characterized by dense and porous layers, while, in the caseof the normally sintered sample, the coatings had grown through the grain boundary of substrate withincreasing the coating time. The surface roughness, thickness and micro-hardness of coatings on theSPSed sample increased gradually with increasing the coating time. The corrosion property ofcoatings on the SPSed sample had a tendency to improve with increasing the coating time in3.5%NaCl solution. However, it was worse than that of coatings on the normally sintered sample
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.569.333.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Damage Behavior in Ceramic Plasma-Coated and Uncoated Glass with Steel-Ball Impact (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), 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: A ceramic plasma-coating method that reduces damage from particle impact in a ceramic material is suggested. A steel-ball impact test was performed to investigate and compare the damage behavior of uncoated and ceramic-coated glass. Cone and lateral crack lengths were compared and damage volume analyzed and compared for different steel-ball diameters and types of coating materials, Al2O3-TiO2, Al2O3, and Cr2O3. Damage resistance of the coating and Al2O3-TiO2 was found to be best because of its mechanical properties and microstructure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03454.x
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  • 6
    Electronic Resource
    Electronic Resource
    Photoacoustic measurements for catalytic effects of perovskite electrodes in a sealed-off CO2 discharge tube (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 3379-3383 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: To investigate catalytic activities of perovskite-type electrodes in a sealed-off CO2 laser cavity, we studied the dissociation and reformation reactions of CO2 during electric discharge by monitoring the concentration change of CO2 as a function of time. A photoacoustic spectroscopy detection was introduced to measure the amount of CO2 in a closed discharge system. The catalytic activities in the dissociation of CO2 were demonstrated and compared for both Cu and La0.7Sr0.3CoO3 cathodes. The discharge with the gas mixture of CO2:N2:He=1:1:8 was performed under nine combinations of different conditions at pressures of 10, 20, and 30 Torr and discharge currents of 3, 4, and 5 mA. Within 1 min after the discharge, the concentration of CO2 reduced drastically by as much as 60% for both cathodes. In the case of the Cu cathode, the amounts of CO2 in the tube had not recovered even after 30 min, while with the perovskite cathode the CO2 contents recovered slowly up to 90%–95% within 5 min and then remained almost unchanged. The dissociation of CO2 with the Cu cathode increased as the total pressure decreased and the discharge current increased. The La0.7Sr0.3CoO3 cathode, however, demonstrated strong suppression in the dissociation of CO2 according to the reformation reaction of CO+(1/2)O2→CO2 by its catalytic activity. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149117
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  • 7
    Electronic Resource
    Electronic Resource
    Threshold reduction of stimulated Brillouin scattering by the enhanced Stokes noise initiation (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1358-1360 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method of threshold reduction for stimulated Brillouin scattering (SBS) has been demonstrated in a SBS medium combined with a laser dye. It is based on the enhanced Stokes noise initiated by additional field with a Brillouin-shifted frequency component emitted from the laser dye in the SBS medium. Rhodamine 6G dye dissolved in SBS medium (ethanol), which was pumped by a 570 nm wavelength laser, was used to prove the SBS threshold reduction by the additional Stokes fields. The SBS threshold of this solution was reduced to a level about four times lower than that of the pure SBS medium. Also, the experimental results were investigated using the modified formula for the SBS threshold. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123549
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  • 8
    Electronic Resource
    Electronic Resource
    Creep Analysis of Cr-Mo Steels Using a Dislocation Based Constitutive Modelling (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 117-120 
    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 order to analyze the creep behaviour of Cr-Mo steels, an elasto-viscoplasticconstitutive model based on dislocation density considerations is described. A combination of a kinetic equation, which describes the mechanical response of a material at a given microstructure in terms of dislocation glide, and evolution equations for internal variables characterising the microstructure provide the constitutive equations of the model. Microstructural features of the material are implemented in the constitutive equation. The internal variables are associated with the total dislocation density. The model has a modular structure and can be adjusted to describe a particular type of materials behaviour and metal forming processes. In this paper, the predicted creep behaviour of Cr-Mo steels is compared with the experimental results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.117.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Finite Element Analysis of Brain Damage due to Impact Force with a Three Dimensional Head Model (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 1333-1338 
    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: Brain damage by the impact force was evaluated by the numerical analysis with a three dimensional Finite Element (FE) model. The FE model was constructed from the MRI data of a subject, and visco-elastic behavior for constitutive equation was applied to the brain tissue. From the FE simulation, brain damage and deformation of the frontal head impacted by a steel impactor were analyzed. The variations of head acceleration and Intra-Cranial Pressure (ICP) during the impact were analyzed in order to evaluate Traumatic Brain Injury (TBI). In addition, relative displacementbetween the skull and the brain due to head impact was investigated. And, pathological severity was evaluated according to Head Injury Criterion (HIC) from the FE simulation. The analytic results of brain damage showed a good agreement with those of the cadaver test performed by Nahum et al. (1977) and other medical reports. And then, the variation of the HIC value was evaluated according to various impact conditions. This study would provide useful data and methodology in the field of biomechanics for analyzing the brain damage by head impact
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.1333.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Cell–cell recognition during fertilization in the red alga, Aglaothamnion oosumiense (Ceramiaceae, Rhodophyta) (1999)
    Springer
    Hydrobiologia 398-399 (1999), S. 81-89 
    Details
    ISSN: 1573-5117
    Keywords: Aglaothamnion oosumiense ; cell-cell recognition ; confocal microscope ; fertilization ; lectin ; Rhodophyta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The binding of fluorescein isothiocyanate (FITC) conjugated lectins to gametes of Aglaothamnion oosumiense Itono during fertilization was studied by the use of confocal microscopy. The physiological effects of lectins and carbohydrates on gamete binding were also examined. Four different lectins, concanavalin A (ConA), soybean agglutinin (SBA), Dolichos biflorus agglutinin (DBA) and wheat germ agglutinin (WGA) bound to the surface of spermatia, but each lectin labelled a different region of the spermatium. SBA and DBA bound only to the spermatial appendages but ConA bound to all the spermatial surface except the spermatial appendages. WGA labelled a narrow region that connects the spermatial body and appendages. During fertilization, the ConA and WGA specific substances on the spermatial surface moved towards the area contacting the trichogyne and accumulated on the surface of the fertilization canal. Spermatial binding to trichogynes was inhibited by pre-incubation of spermat ia with SBA or ConA, while trichogyne receptors were blocked by the complementary carbohydrates, D-glucose or N-acetyl-galactosamine, respectively. WGA and DBA as well as their complementary carbohydrates had little effect on gamete binding. The inhibitory effects of ConA and SBA were increased when the two lectins were applied simultaneously. The inhibitory effects of both lectins were partially reversed (to 80–90% of controls) by addition of complementary carbohydrates at the same time. The results suggested that SBA and ConA receptors on the spermatial surface are involved in gamete recognition in Aglaothamnion oosumiense.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017021730931
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