Three field trials, one for establishment and two for mature phases respectively, were conducted to develop weed management strategies for cashew cultivation in Ghana. The treatments for the establishment phase consis...Three field trials, one for establishment and two for mature phases respectively, were conducted to develop weed management strategies for cashew cultivation in Ghana. The treatments for the establishment phase consisted of hoe weeding of whole plot, hoe weeding of cashew lines and slashing of inter-rows, herbicide application with glyphosate of whole plot or cashew lines with slashing of inter-rows, relay cropping of the cashew plot with sorghum and a legume and intercropping with a legume. In one trial of the mature phase, the treatments were hoe weeding of whole plot two or three times a year, high slashing of whole plot three times a year, herbicide application （glyphosate） of whole plot and ring application of herbicide （glyphosate） plus high slashing of inter-rows twice a year. In the other trial, which was carried out on farmers＇ fields, glyphosate （Roundup） at 2.0 l/ha was tested against manual slashing. In the study of the establishment phase, neither the girth nor height of the cashew seedlings was significantly affected by the treatments. The first year and four year cumulative cashew yields were significantly affected by treatments with the intercrops giving higher yields than the glyphosate-treated plots. Intercropping as a weed control measure was generally more costly than glyphosate application or manual weeding. In the mature trials, chemical weed control slightly improved cashew nut yield and was cheaper to apply. It is recommended to adopt chemical weed control in cashew cultivation in Ghana.展开更多
To better understand the fusion mechanism of heated carbon black, heat treatment is conducted for carbon black produced by benzene pyrolysis. The effects of （a） heating time, （b） heating temperature and （c） heat...To better understand the fusion mechanism of heated carbon black, heat treatment is conducted for carbon black produced by benzene pyrolysis. The effects of （a） heating time, （b） heating temperature and （c） heating rate on the aggregate shape and mean primary particle diameter of the carbon black are investigated using TEM （transmission electron microscopy）. The mean primary particle diameter does not change significantly when carbon black is heat treated. For short heating times and low heating temperatures, the aggregate shapes become simple when compared with those of non-heated carbon black, and shapes become complex with an increase in the heating time. Also, for low heating rates, the aggregate shapes become significantly simple when compared with those of non-heated carbon black. The results of this study suggest that sintering between primary particles is promoted under relatively low heating temperatures, and Ostwald ripening among aggregates is promoted under relatively high heating temperatures.展开更多
Idioms have attracted great attention over recent decades. Nevertheless, controversies still remain in regard of the most plausible cognition mechanism for idiom comprehension, especially concerning non-Indo-European ...Idioms have attracted great attention over recent decades. Nevertheless, controversies still remain in regard of the most plausible cognition mechanism for idiom comprehension, especially concerning non-Indo-European languages and second/foreign language users. Event Related Potential （ERP） experiments on proficient English learners whose native language was Mandarin Chinese were conducted to test the influences of idioms＇ familiarity on both Chinese and English （as foreign language） idiom comprehension. Data including accuracy rates, reaction time, and latency and peak amplitudes of N400 were recorded and analyzed, indicating that familiarity might play a significant role in idiom comprehension in both native and foreign languages. Further, idioms, should they have similar familiarity levels, may be easier to process in the native language （Chinese） than in the foreign language （English）.展开更多
文摘Three field trials, one for establishment and two for mature phases respectively, were conducted to develop weed management strategies for cashew cultivation in Ghana. The treatments for the establishment phase consisted of hoe weeding of whole plot, hoe weeding of cashew lines and slashing of inter-rows, herbicide application with glyphosate of whole plot or cashew lines with slashing of inter-rows, relay cropping of the cashew plot with sorghum and a legume and intercropping with a legume. In one trial of the mature phase, the treatments were hoe weeding of whole plot two or three times a year, high slashing of whole plot three times a year, herbicide application （glyphosate） of whole plot and ring application of herbicide （glyphosate） plus high slashing of inter-rows twice a year. In the other trial, which was carried out on farmers＇ fields, glyphosate （Roundup） at 2.0 l/ha was tested against manual slashing. In the study of the establishment phase, neither the girth nor height of the cashew seedlings was significantly affected by the treatments. The first year and four year cumulative cashew yields were significantly affected by treatments with the intercrops giving higher yields than the glyphosate-treated plots. Intercropping as a weed control measure was generally more costly than glyphosate application or manual weeding. In the mature trials, chemical weed control slightly improved cashew nut yield and was cheaper to apply. It is recommended to adopt chemical weed control in cashew cultivation in Ghana.
文摘To better understand the fusion mechanism of heated carbon black, heat treatment is conducted for carbon black produced by benzene pyrolysis. The effects of （a） heating time, （b） heating temperature and （c） heating rate on the aggregate shape and mean primary particle diameter of the carbon black are investigated using TEM （transmission electron microscopy）. The mean primary particle diameter does not change significantly when carbon black is heat treated. For short heating times and low heating temperatures, the aggregate shapes become simple when compared with those of non-heated carbon black, and shapes become complex with an increase in the heating time. Also, for low heating rates, the aggregate shapes become significantly simple when compared with those of non-heated carbon black. The results of this study suggest that sintering between primary particles is promoted under relatively low heating temperatures, and Ostwald ripening among aggregates is promoted under relatively high heating temperatures.
基金supported by the National Social Sciences Fund Program"Critical discourse analyses of the cyber language violence"under Grant 15BYY057the Fundamental Research Funds for Dalian University of Technology under Grant DUT13RW303~~
文摘Idioms have attracted great attention over recent decades. Nevertheless, controversies still remain in regard of the most plausible cognition mechanism for idiom comprehension, especially concerning non-Indo-European languages and second/foreign language users. Event Related Potential （ERP） experiments on proficient English learners whose native language was Mandarin Chinese were conducted to test the influences of idioms＇ familiarity on both Chinese and English （as foreign language） idiom comprehension. Data including accuracy rates, reaction time, and latency and peak amplitudes of N400 were recorded and analyzed, indicating that familiarity might play a significant role in idiom comprehension in both native and foreign languages. Further, idioms, should they have similar familiarity levels, may be easier to process in the native language （Chinese） than in the foreign language （English）.
