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| 1 | Transformation of Laves phases and its effect on the mechanical properties of TIG welded Mg-Al-Ca-Mn alloys显示文摘The effects of Al content and Ca/Al mass ratio on the microstructure and mechanical properties of tungsten inert gas(TIG)welded Mg-2Ca-x Al-0.5Mn(x=0,1,5)alloy joints were studied in present work.Results showed that increasing Al content was effective in reducing the dendrite spacing at the fusion zone(FZ)edge.The Laves phases in the FZ and the heat-affected zone(HAZ)can be changed from Mg_(2)Ca to(Mg,Al)_(2)Ca with the decrease of Ca/Al ratio,and the(Mg,Al)_(2)Ca could be further transformed to Al_(2)Ca under welding thermal cycle.Furthermore,dynamic dissolution and precipitation of Laves phases and Al_(8)Mn_(5)phases occurred in the HAZ,resulting in a gradient microstructure and hardness peak in this area.The tensile properties of the joints were significantly improved with the increase of Al content,which was mainly due to the modification of Laves phases. | Sensen Chai Shiyu Zhong Qingshan Yang Daliang Yu Qingwei Dai Hehe Zhang Limeng Yin Gang Wang Zongxiang Yao | 2022 | Journal of Materials Science & Technology2022，，25： | 2 |
| 2 | On Diffused Pollution Effect of Chemical Fertilizers in Chongqing Municipality显示文摘Improper use of chemical fertilizers is an essential reason for diffused pollution of agriculture. Therefore,finding out influence factors of farmers in application of chemical fertilizers will play a significant role in controlling the diffused pollution of agriculture. Through field survey,a total of 340 samples in 4 counties of Chongqing Municipality were obtained. On the basis of these samples,an empirical study was carried out. The study results indicate that farmers' application of chemical fertilizers is negatively correlated with farmers' age,education level,male labor proportion,and soil fertility,while the annual family income,agricultural production population proportion,commodity trading characteristics,and scientific fertilizer application ability fail to pass the significance test. These results will provide reference for proper application of chemical fertilizers and controlling diffused pollution. | Limeng GU Lianchao YU Qian BI | 2015 | Asian Agricultural Research2015，7，6： | 0 |
| 3 | The Non-point Source Pollution Effects of Pesticides Based on the Survey of 340 Farmers in Chongqing City显示文摘Using the survey data on 340 farmers in Chongqing City,this paper performs an empirical analysis of the factors influencing the non-point source pollution of pesticides. The results show that the older householders will apply more pesticides,which may be due to the weak physical strength and weak ability to accept the concept of advanced cultivation; the householders with high level of education will choose to use less pesticides; the pesticide application rate is negatively correlated with whether farmers have participated in agricultural technology training,that is,the farmers having participated in agricultural technology training have stronger ability to scientifically apply pesticides,and in-depth understanding of advanced agricultural production technology and positive and negative effects of pesticides,so they often choose to reduce the application rate of pesticide; the cognitive factor on the role of pesticides in better promoting the growth of crops is significant,which requires the government and relevant departments to carry out concrete publicity of effectiveness and negative impact of different pesticides during the popularization of agricultural science knowledge,to prompt farmers to have a systematic and in-depth understanding of the agricultural nonpoint source pollution caused by pesticides. | Lianchao YU Limeng GU Qian BI | 2015 | Asian Agricultural Research2015，7，7： | 0 |
| 4 | Riddle of the Sphinx:facts and evidence regarding the link between mental stress and tumor occurrence and development显示文摘To the Editor:The answer to the'Riddle of Sphinx'is'human',whose image is both negative and positive.It is often used as a metaphor for complex,mysterious,and incomprehensible problems.With the deterioration of modern living environment and the aggravation of stress,the incidence of the tumor is on the rise.Excessive or prolonged stress can lead to acute or chronic organ dysfunction and metabolic disorders. | Ruilin Wang Sheng Yu Limeng Yu Qiming Wang Yufeng Wu | 2022 | Chinese Medical Journal2022，135，24： | 0 |
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