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  • 1
    Electronic Resource
    Electronic Resource
    Phase space structure of non-Abelian Chern–Simmons particles (1994)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 35 (1994), S. 3959-3968 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The classical phase space structure of N SU(n+1) non-Abelian Chern-Simons (NACS) particles is investigated by first constructing the product space of associated SU(n+1) bundle with CPn as the fiber. The Poisson bracket is calculated using the symplectic structure on the associated bundle and it is found that the minimal substitution in the presence of external gauge fields is equivalent to the modification of symplectic structure by the addition of field strength two form. Then, a direct product of the associated bundle is taken by the space of all connections and a specific connection is chosen by the condition of vanishing momentum map corresponding to the gauge transformation, thus recovering the quantum mechanical model of NACS particles in Lee and Oh [Phys. Rev. Lett. 72, 1141 (1994)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530896
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  • 2
    Electronic Resource
    Electronic Resource
    The Effect of Frequency of Electromagnetic Vibration on the Primary Silicon Size in Hypereutectic Al-Si Alloy (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 312-315 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The structural control of Al-Si alloy, which was not studied among various electromagneticprocessing of materials, was considered applying the alternating current and direct current magneticflux density. The main aim of the present study is to investigate the effects of electromagneticvibration on the control of the size of primary Si phase in order to develop a new process of structuralcontrol in Al-Si alloy. If the current density conducted for making high frequency electromagneticvibration (EMV) (≥ 500Hz), the size of primary Si phase goes to small. If it conducted for making lowfrequency EMV (≤ 200Hz), the size of primary Si phase goes to large. This phenomenon consideredto be related the collision, agglomeration and diffusion of silicon atoms
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.312.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructures and Mechanical Properties of Melt Extruded Al-Cu Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 635-638 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Melt extrusion is a new fabrication process with the characteristics of both casting andextrusion. In this process, a metallic melt which is poured and solidified up to semisolid state in thecontainer can be directly extruded through the die exit to form a product of bar shape without otherintermediate processes. The effects of various process parameters, such as melt temperature andextrusion ratio, on the extrusion behavior of Al-Cu alloys in the semisolid state were investigated.Mechanical properties of the melt extruded Al-Cu alloy were measured and its characteristics arecompared with the microstructure and copper contents in the alloy. Al-Cu alloys were successfullyextruded after squeezing out of liquid during the melt extrusion with smaller force (60 Mpa)compared to the solid extrusion. Al-Cu alloys bar with the mean grain size of 200 μm was fabricatedby melt extrusion; however, the mechanical properties have nothing to do with the extrusion ratio.The squeezing out of liquid was get lead to the segregation of the alloys and was affect on themechanical properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.635.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Aging Behavior of Al-Cu Alloys Produced by Melt Extrusion Process (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 550-553 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Melt extrusion is a new fabrication process with the characteristics of both casting andextrusion. In this process, a metallic melt which is poured and solidified up to semisolid state in thecontainer can be directly extruded through the die exit to form a product of bar shape without otherintermediate processes. The aging behavior of Al-Cu alloys in the semisolid state was investigated.And the microstructure and mechanical properties of the melt extruded Al-Cu alloy bar weremeasured and its characteristics are compared with those of a hot extruded Al-Cu alloy bar. Al-Cualloys were successfully extruded after squeezing out of liquid during melt extrusion with smallerforce compared to the solid extrusion. Al-Cu alloys bar with the mean grain size of up to 200 μm wasfabricated by melt extrusion process. And the mechanical properties of the melt extruded Al-Cu alloybar were improved after the T6 treatment
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.550.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Pentacene Growth on Organic-Inorganic Hybrid Type SiOC Film (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 389-394 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Pentacene channel for organic thin film transistor was deposited on the SiOC film by thermalevaporation. The growth of pentacene is related with the Diels-Alder reaction and thenucleophilic reaction by the thermal induction. The surface is an important factor to control therecursive Diels-Alder reaction for growing of pentacene on SiOC film. The terminal C=Cdouble bond of pentacene molecule was broken easily as a result of attack of the nucleophilicreagents on the surface of SiOC film. The nucleophilic reaction can be accelerated by increasingtemperature on surface, and it making pentacene to grow hardly on the SiOC film with a flowrate ratio of O2/(BTMSM+O2)=0.5 due to its inorganic property. The nucleophlic reactionmechanism is SN2 (bimolecular nucleophilic substitution) type
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.389.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Hot Forging of Semi Solidified High Strength Brass (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 791-794 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The name “high strength brass” is given to the wrought and cast alloys indicating theirparticular virtue of high strength, which can be achieved by additions of Al, Fe, Mn and Sn. Forgingsmade from copper base alloys offer a number of advantages over products made by other processes.However, because for forging more heat must be applied to the ingot which was solidified once, thereare some disadvantages in the economy of energy and time. In this study, we investigated themicrostructures and mechanical properties of high strength brass made by semi solid forging andcompared them with those of conventionally forged product and gravity die casting. No shrinkage orgas hole was found in semi solid forgings. Fine equiaxed crystals developed at the center of semi solidforgings, while grains in the corner of semi solid forgings were elongated perpendicular to thepressure direction. The grains of semi solid forgings were smaller than those of conventional forgingsand gravity die castings. It is suggested that a rapid heat transfer condition due to applied pressure isresponsible for grain refinement. Tensile and yield strengths of semi solid forgings were as high asthose of hot forgings but elongation was positioned between that of conventional forgings and gravitydie castings
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.791.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal Expansion Behavior of the Multiphase Composite System (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 765-768 
    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: A new approach for the CTE on the basis of Ashelby.s cutting and welding process was made for the analysis of the thermal expansion behaviors of Al-Si alloys and composites. In this theoretical approach, it was considered that relaxation of residual stress could create an elastoplastic zone in the matrix around a particle during cooling. A comparison of the measured CTEs with the calculated ones for the Al-Si-SiC〈sub〉p〈/sub〉 and Al-Si-Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 composite systems was performed in terms of the volume percent and the size of reinforced phases. The calculated results revealed that the linear CTE of the both composite depends on the size of the reinforce phases, especially at the composite systems with a low volume percent of the reinforce phases. The increase in the volume percentages of Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉, SiC〈sub〉p〈/sub〉 and Si phase lowers the linear CTEs of the systems. The measured CTEs was deviated less than about ten percents from the calculated ones at composites with a high volume percent. The deviations of the CTEs of reinforced phases are about 4 - 6 vol% from real composite systems
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.765.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    The Effect of Frequency of Electromagnetic Vibration on the Primary Silicon Size in Hypereutectic Al-Si Alloy (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 413-416 
    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 study, the electromagnetic vibration is adopted for control of the size of primary Si phase. The higher the current density and frequency of electromagnetic vibration (EMV), the finer the size of primary Si phase. The higher the current density but the lower frequency of EMV, the bigger the size of primary Si phase. This phenomenon considered to be related the collision, agglomeration and diffusion of silicon atoms
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.413.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Nondestructive Evaluation System for White Ginseng Quality Using Image Processing Technique (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 1225-1228 
    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 real-time white ginseng quality evaluation system based on a machine visiontechnique and artificial neural networks was developed to replace the current manual grading andits efficiency was tested. The system consisted of conveyor, image acquisition systemsynchronized with a sample-detecting sensor, and image processing and decision-making system.Software running under Windows system was developed. The algorithm included threeconsecutive stages of (a) image acquisition and preprocessing, (b) mathematical feature extraction,and (c) grade decision using artificial neural networks. Mathematical features such as area ratio,mean and standard deviation of gray level, skewness of gray level histogram, and the number ofrun segment, were extracted from five equally divided parts of a specimen. An artificial neuralnetwork model was used to classify samples into three grading categories. The grading error of thesystem was about 26%, which is comparable to the 30% in case of manual grading. The gradingrate was one sample per a second
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.1225.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Textures and Mechanical Properties of Melt-Extruded Al-Cu Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 522-525 
    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 influence of heat treatment on mechanical properties and textures of a meltextruded Al-4.5wt.%Cu alloy bar was studied. And its characteristics are compared with those of a hot-extruded Al-Cu alloy bar. The results show that the mechanical properties of the melt-extruded Al-Cu alloy bar were slightly higher than those of the hot-extruded bar, and the difference in their mechanical properties was narrowed after the T6 treatment. The recrystallization texture was foundin the melt-extruded Al-Cu alloy bar, and the fiber texture of the hot-extruded Al-Cu alloy bar was found different from that of the melt-extruded Al-Cu alloy bar
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.522.pdf
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