The negative transfer of native language influences the English acquisition process of the college students from Yantai in a great degree,both in the segmental and suprasegmental level,while the consonants in the segm...The negative transfer of native language influences the English acquisition process of the college students from Yantai in a great degree,both in the segmental and suprasegmental level,while the consonants in the segmental level are influenced most.The paper makes an experimental phonetic contrastive study on [d?],[t?],[?] in the aspect of frication between native English speakers from America and English learners from Yantai basing on processing a large number of English word corpora by using PRAAT.It is found that the degree of frication of [d?],[t?],[?] in American English is strong,while Yantai weak.展开更多
Fast neutron radiography(FNR) is an effective non-destructive testing technique.Due to the scattering effect and low detection efficiency,the detection limit of FNR under certain conditions cannot be determined.In ord...Fast neutron radiography(FNR) is an effective non-destructive testing technique.Due to the scattering effect and low detection efficiency,the detection limit of FNR under certain conditions cannot be determined.In order to obtain the minimum detectable thickness by FNR,we studied the contrast sensitivity of FNR lead samples,both theoretically and experimentally.We then clarified the relationship between pixel value and irradiation time,and sample materials and thickness.Our experiment,using a4-cm-thick lead sample,verified our theoretical expression of FNR contrast sensitivity.展开更多
Since the association between nephrogenic systemic fibrosis(NSF) and gadolinium contrast agents(Gd-CAs) was suggested in 2006,several experimental studies have been published to elucidate the role of these agents in t...Since the association between nephrogenic systemic fibrosis(NSF) and gadolinium contrast agents(Gd-CAs) was suggested in 2006,several experimental studies have been published to elucidate the role of these agents in the pathogenesis of NSF.Low stability Gd-CAs have a stimulant effect on human skin and fibroblasts in culture and modulate the production of collagen by these cells.Low stability agents have also induced NSFlike skin changes in a rat model with normal renal function after multiple repeat administrations.The role of the 5/6 subtotal nephrectomy rat model in investigating NSF remains under evaluation.展开更多
文摘The negative transfer of native language influences the English acquisition process of the college students from Yantai in a great degree,both in the segmental and suprasegmental level,while the consonants in the segmental level are influenced most.The paper makes an experimental phonetic contrastive study on [d?],[t?],[?] in the aspect of frication between native English speakers from America and English learners from Yantai basing on processing a large number of English word corpora by using PRAAT.It is found that the degree of frication of [d?],[t?],[?] in American English is strong,while Yantai weak.
文摘Fast neutron radiography(FNR) is an effective non-destructive testing technique.Due to the scattering effect and low detection efficiency,the detection limit of FNR under certain conditions cannot be determined.In order to obtain the minimum detectable thickness by FNR,we studied the contrast sensitivity of FNR lead samples,both theoretically and experimentally.We then clarified the relationship between pixel value and irradiation time,and sample materials and thickness.Our experiment,using a4-cm-thick lead sample,verified our theoretical expression of FNR contrast sensitivity.
文摘Since the association between nephrogenic systemic fibrosis(NSF) and gadolinium contrast agents(Gd-CAs) was suggested in 2006,several experimental studies have been published to elucidate the role of these agents in the pathogenesis of NSF.Low stability Gd-CAs have a stimulant effect on human skin and fibroblasts in culture and modulate the production of collagen by these cells.Low stability agents have also induced NSFlike skin changes in a rat model with normal renal function after multiple repeat administrations.The role of the 5/6 subtotal nephrectomy rat model in investigating NSF remains under evaluation.
