An energy model for the structure transformation of pile-ups of grain boundary dislocations(GBD)at the triple-junction of the grain boundary of ultrafine-grain materials was proposed.The energy of the pile-up of the G...An energy model for the structure transformation of pile-ups of grain boundary dislocations(GBD)at the triple-junction of the grain boundary of ultrafine-grain materials was proposed.The energy of the pile-up of the GBD in the system was calculated by the energy model,the critical geometric and mechanical conditions for the structure transformation of head dislocation of the pile-up were analyzed,and the influence of the number density of the dislocations and the angle between Burgers vectors of two decomposed dislocations on the transformation mode of head dislocation was discussed.The results show when the GBD is accumulated at triple junction,the head dislocation of the GBD is decomposed into two Burgers vectors of these dislocations unless the angle between the two vectors is less than 90°,and the increase of applied external stress can reduce the energy barrier of the dislocation decomposition.The mechanism that the ultrafine-grained metal material has both high strength and plasticity owing to the structure transformation of the pile-up of the GBD at the triple junction of the grain boundary is revealed.展开更多
The paper offers a three-dimensional linguosemiotic study of similes, which implies integral analysis of their semantic, syntactic, and pragmatic aspects. Such an approach to the study of similes is quite new as they ...The paper offers a three-dimensional linguosemiotic study of similes, which implies integral analysis of their semantic, syntactic, and pragmatic aspects. Such an approach to the study of similes is quite new as they have been hitherto considered either from a literary viewpoint as one of the stylistic expressive means of language or in the philosophy of language in correlation with metaphor. The three-dimensional linguosemiotic methodology of research has enabled us： （1） to reveal the cognitive, psychological, and metaphorical essence of similes and work out the invariant conceptual model which remains unchanged throughout their structural-semantic variation in the text; （2） to single out pragmatic features of similes, the set of which defines their linguistic status as a language-in-use construct, i.e., textual phenomenon; （3） to study the denotational-cognitive aspect of similes pointing out the parameters according to which similes have been differentiated into semantic types and subtypes and （4） to generalize the syntactical aspect of similes and define the set of their structural modifications in the text conditioned both by the intralinguistic regularities and by pragmatic factors. Therefore, we have worked out an interdisciplinary theory of similes implying the synergy of the data of linguistic, literary, cognitive, and psychological studies展开更多
基金financial supports from the National Natural Science Foundation of China(Nos.51161003,51561031)the Natural Science Foundation of Guangxi,China(No.2018GXNSFAA138150)。
文摘An energy model for the structure transformation of pile-ups of grain boundary dislocations(GBD)at the triple-junction of the grain boundary of ultrafine-grain materials was proposed.The energy of the pile-up of the GBD in the system was calculated by the energy model,the critical geometric and mechanical conditions for the structure transformation of head dislocation of the pile-up were analyzed,and the influence of the number density of the dislocations and the angle between Burgers vectors of two decomposed dislocations on the transformation mode of head dislocation was discussed.The results show when the GBD is accumulated at triple junction,the head dislocation of the GBD is decomposed into two Burgers vectors of these dislocations unless the angle between the two vectors is less than 90°,and the increase of applied external stress can reduce the energy barrier of the dislocation decomposition.The mechanism that the ultrafine-grained metal material has both high strength and plasticity owing to the structure transformation of the pile-up of the GBD at the triple junction of the grain boundary is revealed.
文摘The paper offers a three-dimensional linguosemiotic study of similes, which implies integral analysis of their semantic, syntactic, and pragmatic aspects. Such an approach to the study of similes is quite new as they have been hitherto considered either from a literary viewpoint as one of the stylistic expressive means of language or in the philosophy of language in correlation with metaphor. The three-dimensional linguosemiotic methodology of research has enabled us： （1） to reveal the cognitive, psychological, and metaphorical essence of similes and work out the invariant conceptual model which remains unchanged throughout their structural-semantic variation in the text; （2） to single out pragmatic features of similes, the set of which defines their linguistic status as a language-in-use construct, i.e., textual phenomenon; （3） to study the denotational-cognitive aspect of similes pointing out the parameters according to which similes have been differentiated into semantic types and subtypes and （4） to generalize the syntactical aspect of similes and define the set of their structural modifications in the text conditioned both by the intralinguistic regularities and by pragmatic factors. Therefore, we have worked out an interdisciplinary theory of similes implying the synergy of the data of linguistic, literary, cognitive, and psychological studies
