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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1825-1828 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Although glass wool and polyurethane foam are the most widely used sound-absorber andinsulating materials, there are some critical problems related to the environmental issues. In thisreason, there is a lot of attention on the aluminum foam as a sound absorption material, therefore, inthis research, sound absorption and transmission loss properties were studied. The results showed thatlow density aluminum foam performed better in both sound absorption and transmission loss and theproperties were improved as increased air cavity and space
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 515-518 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Si and Er co-doped SiO2 films were fabricated by radio-frequency (RF) magnetronsputtering technique with a Si-Er-SiO2 target. The optical gain of 0.7 dB/cm was confirmed by thedirect pumping of Er3+ using the laser diode (LD) of 980 nm in wavelength and 60 mW in outputpower. On the contrary, the pumping Si-nanocrystals by the Hg lamp 365 nm (1.5 W/cm2) induced theabsorption loss above 1.48 μm region in wavelength, which was attributed to the free carrierabsorption of Si-nanocrystals
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European biophysics journal 28 (1999), S. 489-498 
    ISSN: 1432-1017
    Keywords: Key words Monte Carlo simulated annealing ; Simulation ; Membrane helix packing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract The aim of this study is to investigate if the packing motifs of native transmembrane helices can be produced by simulations with simple potentials and to develop a method for the rapid generation of initial candidate models for integral membrane proteins composed of bundles of transmembrane helices. Constituent residues are mapped along the helix axis in order to maintain the amino acid sequence-dependent properties of the helix. Helix packing is optimized according to a semi-empirical potential mainly composed of four components: a bilayer potential, a crossing angle potential, a helix dipole potential and a helix-helix distance potential. A Monte Carlo simulated annealing protocol is employed to optimize the helix bundle system. Necessary parameters are derived from theoretical studies and statistical analysis of experimentally determined protein structures. Preliminary testing of the method has been conducted with idealized seven Ala20 helix bundles. The structures generated show a high degree of compactness. It was observed that both bacteriorhodopsin-like and δ-endotoxin-like structures are generated in seven-helix bundle simulations, within which the composition varies dependent upon the cooling rate. The simulation method has also been employed to explore the packing of N = 4 and N = 12 transmembrane helix bundles. The results suggest that seven and 12 transmembrane helix bundles resembling those observed experimentally (e.g., bacteriorhodopsin, rhodopsin and cytochrome c oxidase subunit I) may be generated by simulations using simple potentials.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European biophysics journal 28 (2000), S. 663-673 
    ISSN: 1432-1017
    Keywords: Key words Simulated annealing ; Monte Carlo ; Simulation ; Bilayer potential ; Bacteriorhodopsin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Bacteriorhodopsin (BR) is a membrane protein which pumps protons through the plasma membrane. Seven transmembrane BR helical segments are subjected to simulation studies in order to investigate the packing process of transmembrane helices. A Monte Carlo simulated annealing protocol is employed to optimize the helix bundle system. Helix packing is optimized according to a semi-empirical potential mainly composed of six components: a bilayer potential, a crossing angle potential, a helix dipole potential, a helix-helix distance potential, a helix orientation potential and a helix-helix distance restraint potential (a loop potential). Necessary parameters are derived from theoretical studies and statistical analysis of experimentally determined protein structures. The structures from the simulations are compared with the experimentally determined structures in terms of geometry. The structures generated show similar shapes to the experimentally suggested structure even without the helix-helix distance restraint potential. However, the relative locations of individual helices were reproduced only when the helix-helix distance restraint potential was used with restraint conditions. Our results suggest that transmembrane helix bundles resembling those observed experimentally may be generated by simulations using simple potentials.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European biophysics journal 28 (2000), S. 674-682 
    ISSN: 1432-1017
    Keywords: Key words Bacteriorhodopsin ; Simulated annealing ; Molecular dynamics simulation ; Bilayer potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Bacteriorhodopsin (BR) is a membrane protein which pumps protons through the plasma membrane. Transmembrane BR helical segments are subjected to simulation studies in order to investigate the effect of bilayer environment in various simulation conditions. A bilayer potential is introduced to the system to mimic the lipid membrane. The structures from the simulations are compared with the experimentally determined structures in terms of geometrical properties. Electrostatic contribution to the helix packing is also investigated. The simulation results show that the packing geometry of the transmembrane helices is highly affected by the bilayer potential. The results obtained from the simulations may be used for further simulation studies and analysis in investigating transmembrane helix packing.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 73-76 
    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 aims of this study are to investigate the effect of Y (yttrium) addition in the Mg-Al-Ca alloys on microstructure and mechanical properties. In additions, the alloys were solution treatedin order to achieve a better understanding of the precipitation mechanisms. The as-castmicrostructure of Mg-5Al-3Ca alloy and Mg-5Al-3Ca-xY alloys contains dendritic α-Mg matrixand eutectic intermetallic compound at grain boundary. The hardness values of Mg-Al-Ca alloywith Y additions were slightly increased than that of Mg-Al-Ca with no Y addition. It is because ofreduction of α-Mg phase and presence of (Mg,Al)2Ca and Al-Y rich intermetallic phase at grainboundary and α-Mg matrix grains. Also, hardness value of yttrium (Y) containing alloys wasincreased with increasing Y contents. Compared to Mg-5Al-3Ca alloy, maximum strength and yieldstrength of the alloys with Y additions have slightly increased with increasing Y additions in thecase of as-cast samples
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 77-80 
    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 study, we try to investigate the asymmetric rolling process affects microstructure,texture and formability of AZ31 Mg sheet. The deformation twins are clearly apparent, small andrecrystallized grains are visible along some grain boundary and twinned regions in the as-rolledboth samples. The symmetrically rolled sample tended to show peak inclined to the rolling direction.On the other hand, the asymmetrically rolled sample tended to show peak slightly inclined to thetransverse direction. From the pole figure observation by EBSD, the intensity decrease of basalfiber texture after asymmetric rolling should be attributed to the severe shear strain induced duringasymmetric process. The Erichsen value was measured to be 6.5 for asymmetrically rolled sampleand 5.2 for symmetrically rolled sample
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 153-156 
    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: The as-cast microstructure of Mg-5Al-3Ca-2Sm alloy consists of equiaxed α-Mg matrix,(Mg, Al)2Ca eutectic phase and Al-Sm rich intermetallic compounds. This eutectic phase of theextruded alloys was elongated to extrusion direction and size of this phase was finered compare tothat of as-cast alloys because of severe deformation during hot extrusion. After hot extrusion, theaverage grain size of Mg-5Al-3Ca and Mg-5Al-3Ca-2Sm alloys was 4.8 *m and 3.8 *m, respectively.In load-unload hardness test, penetration depth was decreased with added Sm and after extrusionprocedure because of grain size refining by addition Sm and large deformation. Hardness value of thealloys containing Sm was higher than that of Mg-5Al-3Ca alloy due to grain refining and formationAl-Sm rich intermetallic compound at gain boundary and α-Mg matrix. Maximum hardness valuewas obtained at the extruded Mg-5Al-3Ca-2Sm alloy at elevated temperatures
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 609-612 
    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: The practical uses of soft magnetic composite(SMC) for an electrical motor is presented inthis paper. SMC allows obtaining improved stator and core shapes as well as totally new designconcepts such as claw pole motor. However, a major disadvantage of soft magnetic composites wastheir weak strength. In this study, spark plasma sintering (SPS) was utilized to improve the strengthof SMC. Advantages of the SPS process over other conventional sintering process are the fasterheating and cooling rates ensured and higher pressure applied during the sintering procedure. Thisallows obtaining high strength products in short periods of time to meet with industrial applicationwithout insulation destruction. This paper introduces the development of high strength soft magneticcomposite motor core and examples of practical application for industries. The result showed that theSPS process increased the fracture strength, about 1.3 to 1.7 times, of SMC compare to theconventional compaction. Also we derive method to reduce the iron loss in the SPS sintering processusing control forming temperature. As the forming temperature decreased from 500°C to 300°C,reduction of iron-loss was obtained from 192W/kg to 21W/kg by using SPS sintering process.Moreover, with increased the SPS sintering process pressure value from 250MPa to 800MPa which isthe conventional compaction condition and decreased forming temperature to 200°C, iron-loss wasmeasured. The results showed that iron-loss was obtained 11.42W/kg and it was similar value ofconventional compaction results
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 41-42 (Apr. 2008), p. 435-438 
    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: The aims of this study are to investigate the microstructure evolution of AZ31 Mg alloyswith normal rolling and cross rolling as the large strain hot rolling affects microstructure, textureand mechanical properties of AZ31 Mg alloys. In the microstructures of as-rolled both samples,twins are clearly apparent, small and recrystallized grains are visible along some grain boundaryand twinned regions. The Lankford values of large strain cross rolled sample obviously demonstratethe higher average r-value and lower planar anisotropy value. The press formability of cross rolledMg alloy might be improved due to control of texture and grain size by severe deformation
    Type of Medium: Electronic Resource
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