This research investigated the effects of captions on Chinese EFL students' incidental vocabulary acquisition. The results are: 1) Captions contribute a lot to students' incidental vocabulary acquisition. In p...This research investigated the effects of captions on Chinese EFL students' incidental vocabulary acquisition. The results are: 1) Captions contribute a lot to students' incidental vocabulary acquisition. In particular, English captions more greatly enhanced students' mastery of word-spelling and listening word recognition. Chinese captions better improved students' mastery of word-meaning. 2) The effects of both L1 and L2 captions on vocabulary acquisition are conspicuous for students of both high and low L2 proficiency. But in terms of word meaning, students with low L2 proficiency benefit tremendously more from the L1 captions than from the L2 subtitles while the differences between the effects of L1 and L2 captions are not so great for the students of high L2 proficiency. The study suggested that captioned authentic video materials could be a good method to teach L2 vocabulary, but the teachers have to be careful in deciding when and how to use the captions.展开更多
Motion event typology predicts that languages can be divided into either satellite-framed, verb-framed or serial-framed languages. However, an increasing number of studies show that languages within the same type pred...Motion event typology predicts that languages can be divided into either satellite-framed, verb-framed or serial-framed languages. However, an increasing number of studies show that languages within the same type predispose their speakers to describe motion events differently. Based on the narrative behavior of 15 native speakers, we provide evidence that suggests Tunisian Arabic （TA） is an untypical verb-framed language. One the one hand, TA conflates motion and path meanings in the main verb, and native speakers adhere to the boundary-crossing constraint. On the other hand, the availability of a rich manner verb lexicon combined with the availability of mono-verbal clauses ready to be coordinated asyndetically, encourages TA speakers to attend to the manner of motion more often than reported for a typical verb-framed language （e.g., Spanish）. Based on these fmdings, we conclude that predictions based on motion event typology are best considered as guidelines, and not as an accurate reflection of how motion meanings may be lexicalized and expressed in individual languages展开更多
Three different inlet configurations,including a original straight pipe and two bend pipes with different axial length,for a high speed low mass flow centrifugal compressor were modeled with whole blade passages and s...Three different inlet configurations,including a original straight pipe and two bend pipes with different axial length,for a high speed low mass flow centrifugal compressor were modeled with whole blade passages and simulated unsteadily by 3D viscous Navier-Stokes equations.The performance disparities of compressor stage were tested and verified by experiments in which dynamic pressure data acquisition of internal flow field was performed.As the result shows,the choke point decreases to lower mass flow rate due to the distortion caused by bend-pipe inlet and is aggravated as the rotation speed increases.The distortion effect spreads circumferentially in impeller and makes the flow structure varied.The longer axial distance bent inlet leads to larger radial distortion and heavy blockage at mid-span under large mass flow mainly causes compressor choke margin nar-rowed.Bend pipe distortion brings an impact up to diffuser on unsteady pressure pulsation caused by blades sweep and the impact appears more powerful when it is closer to volute tongue.展开更多
文摘This research investigated the effects of captions on Chinese EFL students' incidental vocabulary acquisition. The results are: 1) Captions contribute a lot to students' incidental vocabulary acquisition. In particular, English captions more greatly enhanced students' mastery of word-spelling and listening word recognition. Chinese captions better improved students' mastery of word-meaning. 2) The effects of both L1 and L2 captions on vocabulary acquisition are conspicuous for students of both high and low L2 proficiency. But in terms of word meaning, students with low L2 proficiency benefit tremendously more from the L1 captions than from the L2 subtitles while the differences between the effects of L1 and L2 captions are not so great for the students of high L2 proficiency. The study suggested that captioned authentic video materials could be a good method to teach L2 vocabulary, but the teachers have to be careful in deciding when and how to use the captions.
文摘Motion event typology predicts that languages can be divided into either satellite-framed, verb-framed or serial-framed languages. However, an increasing number of studies show that languages within the same type predispose their speakers to describe motion events differently. Based on the narrative behavior of 15 native speakers, we provide evidence that suggests Tunisian Arabic （TA） is an untypical verb-framed language. One the one hand, TA conflates motion and path meanings in the main verb, and native speakers adhere to the boundary-crossing constraint. On the other hand, the availability of a rich manner verb lexicon combined with the availability of mono-verbal clauses ready to be coordinated asyndetically, encourages TA speakers to attend to the manner of motion more often than reported for a typical verb-framed language （e.g., Spanish）. Based on these fmdings, we conclude that predictions based on motion event typology are best considered as guidelines, and not as an accurate reflection of how motion meanings may be lexicalized and expressed in individual languages
基金supported by Chinese Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20101101110009)the National Natural Science Foundation of China (Grant No. 51176013)
文摘Three different inlet configurations,including a original straight pipe and two bend pipes with different axial length,for a high speed low mass flow centrifugal compressor were modeled with whole blade passages and simulated unsteadily by 3D viscous Navier-Stokes equations.The performance disparities of compressor stage were tested and verified by experiments in which dynamic pressure data acquisition of internal flow field was performed.As the result shows,the choke point decreases to lower mass flow rate due to the distortion caused by bend-pipe inlet and is aggravated as the rotation speed increases.The distortion effect spreads circumferentially in impeller and makes the flow structure varied.The longer axial distance bent inlet leads to larger radial distortion and heavy blockage at mid-span under large mass flow mainly causes compressor choke margin nar-rowed.Bend pipe distortion brings an impact up to diffuser on unsteady pressure pulsation caused by blades sweep and the impact appears more powerful when it is closer to volute tongue.
