This study examines the ba and bei constructions in Mandarin using data from the Tong corpus, a new multimedia longitudinal child language corpus. A unified aspectual account of the two constructions is proposed: both require telic predicates, and should thus correlate with the perfective rather than imperfective aspect for learners. Analysis of corpus and diary data reveals that Tong is generally sensitive to the telic requirement when he begins to use the two constructions around 2;0. His ba and bei sentences occur far more frequently in perfective than imperfective aspect, consistent with the Aspect Hypothesis. However, while the majority of the child's bei passives are perfective, the majority of his ba sentences are produced without overt aspect markers, among which most are irrealis (imperatives, modal sentences, etc.). The difference mirrors the pattern in adult input. These findings are corroborated by additional child Mandarin corpora. The acquisition of the aspectual properties of the ba and bei constructions is influenced by inherent knowledge, input and language-specific features of Mandarin, consistent with the multi-factorial account proposed by earlier studies.
A hybrid material of graphene and porous Ni with highly active Ni(OH) 2 was formed through a one-step electrochemical exfoliation assisted method. The porous Ni with a pore size of 2-10 micrometers obtained by a hydrogen bubble template method was used as the cathode while the graphite foil was used as the anode with only (NH 4 ) 2 SO 4 as the electrolyte. Both the high surface areas of porous Ni and the oxygen radicals in graphene favored the formation of the Ni(OH) 2 . It is confirmed by energy dispersion spectrum, transmission electron microscope, Raman spectroscopy, x-ray diffraction and x-ray photoelectron spectroscopy analysis. Both the active area and the glucose sensing property of the as-prepared hybrid material were estimated by electrochemical methods of cyclic voltammetry with current-voltage (C-V) curve, chronoamperometry with current-time (I-t) curve and electrochemical impedance spectroscopy analysis, respectively. It shows an extraordinary active area as well as a low charge transfer resistance and absorption resistance. As a result, a high sensitivity of 6504 μA/mM −1 cm −2 within a linear range of 4 μM-1.0 mM was obtained for glucose detection.
This study investigates effects of selective vulnerability and dominant language transfer in heritage grammar. Mandarin Chinese has a shì…de cleft construction, which, despite its superficial similarities with the it-cleft in English, is subject to additional conditions. Four experimental tasks elicited eighteen adult heritage speakers’ implicit knowledge of the word order and the temporal, telicity and discourse conditions associated with the Chinese cleft. The heritage speakers demonstrated target-like representation of the conditions. Meanwhile, their sensitivity to the telicity and discourse conditions is weaker than that of native speakers in Beijing, suggesting selective vulnerability in the heritage grammar. By comparing the heritage speakers with adult second language learners of Chinese, we concluded that the vulnerability of the heritage grammar in the discourse domain did not result from cross-linguistic influence from English. In different types of Chinese-English bilinguals, the dominant language affects the weaker language in different ways.
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