In arid regions, water vapor diffusion predominates the total water migration in unsaturated soil, which significantly influences agriculture and engineering applications. With the aim of revealing the diffusion mecha...In arid regions, water vapor diffusion predominates the total water migration in unsaturated soil, which significantly influences agriculture and engineering applications. With the aim of revealing the diffusion mechanism of water vapor in unsaturated soil, a water vapor migration test device was developed to conduct the water vapor migration indoor test. The test results demonstrate that the characteristics of water vapor diffusion in unsaturated soil conformed to Fick’s second law. A mathematical model for water vapor diffusion under isothermal conditions in unsaturated soil was established based on Fick’s law. Factors including the initial moisture content gradient, initial moisture content distribution, soil type and temperature that affect the water vapor diffusion coefficient were analyzed. The results show that there was good agreement between the moisture content calculated by the mathematical model and obtained by the indoor experiment. The vapor diffusion coefficient increased with increasing initial moisture content gradient and temperature. When the initial moisture content gradient is constant, the vapor diffusion coefficient increases with the increase of matrix suction ratio in dry and wet soil section. The effect of soil type on the water vapor diffusion coefficient was complex, as both the moisture content and soil particle sizes affected the water vapor diffusion.展开更多
The study investigates: (1) how different idiom types, classified on the basis of a cross-linguistic comparison of Chinese and English idioms in terms of conceptual basis, affect English idiom comprehension as reveale...The study investigates: (1) how different idiom types, classified on the basis of a cross-linguistic comparison of Chinese and English idioms in terms of conceptual basis, affect English idiom comprehension as revealed from both the general performance and the on-line processing strategies adopted by Chinese EFL learners at different proficiency levels, and (2) to what extent can the observed learner behavior be accounted for within the theoretical framework of idiom comprehension. The study has provided empirical evidence for the configuration hypothesis of idiom comprehension.展开更多
基金Projects(51878064, 51378072) supported by the National Natural Science Foundation of ChinaProjects(300102218408, 300102219108) supported by the Fundamental Research Funds for the Central Universities, China。
文摘In arid regions, water vapor diffusion predominates the total water migration in unsaturated soil, which significantly influences agriculture and engineering applications. With the aim of revealing the diffusion mechanism of water vapor in unsaturated soil, a water vapor migration test device was developed to conduct the water vapor migration indoor test. The test results demonstrate that the characteristics of water vapor diffusion in unsaturated soil conformed to Fick’s second law. A mathematical model for water vapor diffusion under isothermal conditions in unsaturated soil was established based on Fick’s law. Factors including the initial moisture content gradient, initial moisture content distribution, soil type and temperature that affect the water vapor diffusion coefficient were analyzed. The results show that there was good agreement between the moisture content calculated by the mathematical model and obtained by the indoor experiment. The vapor diffusion coefficient increased with increasing initial moisture content gradient and temperature. When the initial moisture content gradient is constant, the vapor diffusion coefficient increases with the increase of matrix suction ratio in dry and wet soil section. The effect of soil type on the water vapor diffusion coefficient was complex, as both the moisture content and soil particle sizes affected the water vapor diffusion.
文摘The study investigates: (1) how different idiom types, classified on the basis of a cross-linguistic comparison of Chinese and English idioms in terms of conceptual basis, affect English idiom comprehension as revealed from both the general performance and the on-line processing strategies adopted by Chinese EFL learners at different proficiency levels, and (2) to what extent can the observed learner behavior be accounted for within the theoretical framework of idiom comprehension. The study has provided empirical evidence for the configuration hypothesis of idiom comprehension.
