Linguistics and anthropology have much in common in terms of research category and methodology. Whereas the ＂emic/etic＂ approach in linguistics distinguishes between the social/psychological qualities of the sound s...Linguistics and anthropology have much in common in terms of research category and methodology. Whereas the ＂emic/etic＂ approach in linguistics distinguishes between the social/psychological qualities of the sound system of a specific language and the physical/ physiological qualities of supra-language sounds, the ＂emic/etic＂ approach in anthropology attempts to make a distinction between the ＂inside＂ view and the ＂outside＂ view of culture. Both approaches involve a set of dualistic relationships between linguistic and cultural relativity and linguistic and cultural universality, as well as between linguistic/ cultural diversity and genetic diversity. Due to validation difficulties, ＂linguistic relativity＂ has received a cold welcome in the field of linguistics. However, ＂cultural relativity＂ now constitutes the core of modem anthropology. The inherent links and near identity of functions between linguistic/cultural diversity and biological diversity render possible methodological exchanges across the disciplines.展开更多
In this paper, the author studies the multidimensional stability of subsonic phase transitions in a steady supersonic flow of van der Waals type. The viscosity capillarity criterion （in ＂Arch. Rat. Mech. Anal., 81（...In this paper, the author studies the multidimensional stability of subsonic phase transitions in a steady supersonic flow of van der Waals type. The viscosity capillarity criterion （in ＂Arch. Rat. Mech. Anal., 81（4）, 1983, 301-315＂） is used to seek physical admissible planar waves. By showing the Lopatinski determinant being non-zero, it is proved that subsonic phase transitions are uniformly stable in the sense of Majda （in ＂Mem. Amer. Math. Soc., 41（275）, 1983, 1-95＂） under both one dimensional and multidimensional perturbations.展开更多
Penetration depth,spray dispersion angle,droplet sizes in breakup processes and atomization processes are very important parameters in combustor of air-breathing engine.These processes will enhance air/fuel mixing ins...Penetration depth,spray dispersion angle,droplet sizes in breakup processes and atomization processes are very important parameters in combustor of air-breathing engine.These processes will enhance air/fuel mixing inside the combustor.Experimental results from the pulsed air-assist liquid jet injected into a cross-flow are investigated.And experiments were conducted to a range of cross-flow velocities from 42～136 m/s.Air is injected with 0～300kPa,with air-assist pulsation frequency of 0～20Hz.Pulsation frequency was modulated by solenoid valve.Phase Doppler Particle Analyzer(PDPA) was utilized to quantitatively measuring droplet characteristics.High-speed CCD camera was used to obtain injected spray structure.Pulsed air-assist liquid jet will offer rapid mixing and good liquid jet penetration.Air-assist makes a very fine droplet which generated mist-like spray.Pulsed air-assist liquid jet will introduce additional supplementary turbulent mixing and control of penetration depth into a cross-flow field.The results show that pulsation frequency has an effect on penetration,transverse velocities and droplet sizes.The experimental data generated in these studies are used for a development of active control strategies to optimize the liquid jet penetration in subsonic cross-flow conditions and predict combustion low frequency instability.展开更多
文摘Linguistics and anthropology have much in common in terms of research category and methodology. Whereas the ＂emic/etic＂ approach in linguistics distinguishes between the social/psychological qualities of the sound system of a specific language and the physical/ physiological qualities of supra-language sounds, the ＂emic/etic＂ approach in anthropology attempts to make a distinction between the ＂inside＂ view and the ＂outside＂ view of culture. Both approaches involve a set of dualistic relationships between linguistic and cultural relativity and linguistic and cultural universality, as well as between linguistic/ cultural diversity and genetic diversity. Due to validation difficulties, ＂linguistic relativity＂ has received a cold welcome in the field of linguistics. However, ＂cultural relativity＂ now constitutes the core of modem anthropology. The inherent links and near identity of functions between linguistic/cultural diversity and biological diversity render possible methodological exchanges across the disciplines.
文摘In this paper, the author studies the multidimensional stability of subsonic phase transitions in a steady supersonic flow of van der Waals type. The viscosity capillarity criterion （in ＂Arch. Rat. Mech. Anal., 81（4）, 1983, 301-315＂） is used to seek physical admissible planar waves. By showing the Lopatinski determinant being non-zero, it is proved that subsonic phase transitions are uniformly stable in the sense of Majda （in ＂Mem. Amer. Math. Soc., 41（275）, 1983, 1-95＂） under both one dimensional and multidimensional perturbations.
基金supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD,Basic Research Promotion Fund) (KRF-2007-D00084)
文摘Penetration depth,spray dispersion angle,droplet sizes in breakup processes and atomization processes are very important parameters in combustor of air-breathing engine.These processes will enhance air/fuel mixing inside the combustor.Experimental results from the pulsed air-assist liquid jet injected into a cross-flow are investigated.And experiments were conducted to a range of cross-flow velocities from 42～136 m/s.Air is injected with 0～300kPa,with air-assist pulsation frequency of 0～20Hz.Pulsation frequency was modulated by solenoid valve.Phase Doppler Particle Analyzer(PDPA) was utilized to quantitatively measuring droplet characteristics.High-speed CCD camera was used to obtain injected spray structure.Pulsed air-assist liquid jet will offer rapid mixing and good liquid jet penetration.Air-assist makes a very fine droplet which generated mist-like spray.Pulsed air-assist liquid jet will introduce additional supplementary turbulent mixing and control of penetration depth into a cross-flow field.The results show that pulsation frequency has an effect on penetration,transverse velocities and droplet sizes.The experimental data generated in these studies are used for a development of active control strategies to optimize the liquid jet penetration in subsonic cross-flow conditions and predict combustion low frequency instability.
