Social security of migrant workers has been significant in dissolving social contradictions and achieving the economic and social development in China during the transitional period. The researches of domestic scholar...Social security of migrant workers has been significant in dissolving social contradictions and achieving the economic and social development in China during the transitional period. The researches of domestic scholar on social security of migrant workers can be classified into three categories. Firstly, theoretical analysis on social security of migrant workers, including researches on the appeal of social security and misunderstanding of recognition, theory-construction of rural worker social security, policy defects and equity construction in social security system of migrant workers. Secondly, real studies on social security of migrant workers, including researches on sequence of demand and influencing factors of social security of migrant workers as well as intrinsic motivation forming the perspective on social security. Lastly, road exploration of establishing social security system, including researches on the multi-level development of rural worker social security system, comparison of "Double-low method", "Guangdong Method" and "Shanghai Method" of the social security of migrant workers in Zhejiang Province and establishing multi-level social security system according to the hierarchy after the internal differentiation.展开更多
The comprehensive scan technique using single quadruple GC-MS was introduced and demonstrated in different applications for improving the sensitivity,selectivity,and speed of analysis of multi-compound in complex matr...The comprehensive scan technique using single quadruple GC-MS was introduced and demonstrated in different applications for improving the sensitivity,selectivity,and speed of analysis of multi-compound in complex matrices. This flexible technique includes eight types of scan functions combined with selectable instrument parameters,which gives additional benefits when compared to traditional single full scan or SIM function. The sensitivity of PBDEs especially dece-BDE was improved by using multiple full scan and multiple simultaneous FS/SIM mode;the method development of multi-residue analysis of pesticides in food was simplified using a combination of FS and SIM展开更多
文摘Social security of migrant workers has been significant in dissolving social contradictions and achieving the economic and social development in China during the transitional period. The researches of domestic scholar on social security of migrant workers can be classified into three categories. Firstly, theoretical analysis on social security of migrant workers, including researches on the appeal of social security and misunderstanding of recognition, theory-construction of rural worker social security, policy defects and equity construction in social security system of migrant workers. Secondly, real studies on social security of migrant workers, including researches on sequence of demand and influencing factors of social security of migrant workers as well as intrinsic motivation forming the perspective on social security. Lastly, road exploration of establishing social security system, including researches on the multi-level development of rural worker social security system, comparison of "Double-low method", "Guangdong Method" and "Shanghai Method" of the social security of migrant workers in Zhejiang Province and establishing multi-level social security system according to the hierarchy after the internal differentiation.
文摘The comprehensive scan technique using single quadruple GC-MS was introduced and demonstrated in different applications for improving the sensitivity,selectivity,and speed of analysis of multi-compound in complex matrices. This flexible technique includes eight types of scan functions combined with selectable instrument parameters,which gives additional benefits when compared to traditional single full scan or SIM function. The sensitivity of PBDEs especially dece-BDE was improved by using multiple full scan and multiple simultaneous FS/SIM mode;the method development of multi-residue analysis of pesticides in food was simplified using a combination of FS and SIM
