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Musharbash^ yasmine & geir henning presterudstuen (eds). monster anthropology in australasia and beyond. 228 pp.^ map^ illus.^ bibliogrs. new york: palgrave^ 2014. £60.00 (cloth)
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- 저자 : Fanchao Meng (검색결과 3 건)
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Meng Fanchao,Wu Yuying,Li Wenbo,Hu Kaiqi,Zhao Kai,Yang Huabing,Gao Tong,Sun Yue,Liu Xiangfa 한국물리학회 2022 Current Applied Physics Vol.39 No.-
Evolution of the heat-resistant phases and deformation behavior of α-Al matrix of four alloys have been characterized by SEM and EBSD. The strengthening mechanisms influenced by morphology and distribution of the heat-resistant phases were described. And the strain contouring of the α-Al matrix after deformation was rendered. The heat-resistant phases with block-like as reticular or semi-reticular network distribution exist in grain boundary can effectively provide elevated-temperature strength for alloys, while the strain contouring of α-Al matrix is mainly concentrated in the area with fewer intermetallic phases. It is shown that intermetallic phase evolution corresponds to extrusion treatment and the formation of eutectic Si and primary Si, highly interconnected networks of intermetallic phases exist in the alloy in which the primary Si and the eutectic Si are simultaneously present or disappeared. And only the disappearance of the primary Si and the extrusion treatment will destroy the network structure of the intermetallic phases. A reticular or semi-reticular microstructure is more capable of matching strength and plasticity and facilitating uniform deformation of the α-Al matrix. And the destruction of this microstructure is allowed to accommodate more plastic strain before failure.
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Wind-induced vibrations and suppression measures of the Hong Kong-Zhuhai-Macao Bridge
Cunming Ma,Zhiguo Li,Fanchao Meng,Haili Liao,Junxin Wang 한국풍공학회 2021 Wind and Structures, An International Journal (WAS Vol.32 No.3
A series of wind tunnel tests, including 1:50 sectional model tests, 1:50 free-standing bridge tower tests and 1:70 full-bridge aeroelastic model tests were carried out to systematically investigate the aerodynamic performance of the Hong Kong-Zhuhai-Macao Bridge (HZMB). The test result indicates that there are three wind-resistant safety issues the HZMB encounters, including unacceptable low flutter critical wind speed, vertical vortex-induced vibration (VIV) of the main girder and galloping of the bridge tower in across-wind direction. Wind-induced vibration of HZMB can be effectively suppressed by the application of aerodynamic and mechanical measures. Acceptable flutter critical wind speed is achieved by optimizing the main girder form (before: large cantilever steel box girder, after: streamlined steel box girder) and cable type (before: central cable, after: double cable); The installations of wind fairing, guide plates and increasing structural damping are proved to be useful in suppressing the VIV of the HZMB; The galloping can be effectively suppressed by optimizing the interior angle on the windward side of the bridge tower. The present works provide scientific basis and guidance for wind resistance design of the HZMB.
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Jingbo Qiao,Hongmin Zhang,Haoyan Meng,Fanchao Meng,Yang Tong,Daiyi Chao,Peter K. Liaw,Shuying Chen 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.2
The equiatomic high entropy alloy (HEA) NiCoCrFePd crystalizes as a single face-centered cubic (FCC) phase with stronglocal lattice distortion due to large atomic size mismatch between Pd element and other constitute elements. To betterunderstand this quinary alloy, a family of single FCC phase equiatomic alloys made from the constituent elements of theNiCoCrFePd HEA, including the binary NiPd alloy, medium entropy alloys (MEAs) of NiCoPd, NiCrPd, and NiFePd, andthe quinary NiCoCrFePd HEA with fully-recrystallized microstructure was experimentally investigated to understand thechemical effects on grain growth kinetics and solid solution hardening. With the principal elements increasing from two tofive, the grain growth was increasingly inhibited in the annealing temperature range of 800–900 °C, while at 1000 °C andabove, the NiCrPd MEA showed the slowest grain growth, which may attribute to the higher melting temperature of Crand negative mixing enthalpy between Cr and other constituent elements, increasing the activation energy of grain growth. Moreover, the hardness depending on the grain size complied with the Hall-Petch relationship, in which NiCoPd exhibitedthe lowest hardness, while NiPd had a comparable hardness with NiCrPd and NiFePd. The above results suggested thatthe number of alloying elements was not the sole factor determining the sluggish diffusion and hardness. Instead, thetype of constituent elements in the Pd-containing multicomponent alloys played more critical role. Furthermore, it wasconcluded that the strength of MEAs and HEA should depend on the combination of atomic size and modulus mismatchand electronegativity difference.
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