A thermogravimetric analysis (TG) was conducted to study the thermal decomposition behavior and kinetics of composites from coal and high density polyethylene (HDPE), linear low density polyethylene (LLDPE) or low den...A thermogravimetric analysis (TG) was conducted to study the thermal decomposition behavior and kinetics of composites from coal and high density polyethylene (HDPE), linear low density polyethylene (LLDPE) or low density polyethylene (LDPE). The results show that coal facilitates melting of the polyethylene before temperatures reach 700 K in nitrogen due to the exothermic effect of coal. Above 700 K, adding coal into the polyethylene will result in smaller maximum rates of mass loss and higher initial mass loss temperatures of the composites. Hence, some chemical interactions, occurring between liquid compounds released in the pyrolysis of the coal and polymer, depend on several factors, such as coal rank and the molecular structure of polymers. Synergetic effects in coal and polymers were also found. Both chemical interactions and synergetic effects control the entire thermal decomposition behavior of compos- ites. The larger the amount of coal in the composites, the greater the decomposition temperature spans and the higher the maximum decomposition temperature, the smaller the devolatilization rates. The effect of coal on the thermal stability of composites lies in the hydrogen acceptor effect of the coals. Thermal decomposition of the coals, the polymers and related composites can be modelled via first order parallel reactions between 563 K and 763 K.展开更多
[ Objective] The aim was to explore the classification basis of Chinese local chicken for providing theoretical basis of giving full play to the genetic potential, heterosis, new ideas and methods of new varieties and...[ Objective] The aim was to explore the classification basis of Chinese local chicken for providing theoretical basis of giving full play to the genetic potential, heterosis, new ideas and methods of new varieties and strains breeding, identification and evaluation. [ Method] The multivariate statistical analysis of laying performance and production area ecology of 11 kind of chicken was done by principal component analysis and cluster analysis. E]Result] The cluster analysis of 4 egg laying performance indexs indicated that 11 kinds of chicken can be roughly classified into large chicken and small chicken; 10 indexs of multivariate statistical analysis indicated that 11 kinds of chicken can be classified into high altitude type and low altitude type when first 3 eigenvalues were selected as 3 principal component by principal component analysis（ 94.99% of the total amount of information）, and similarity coefficient was computed according to first three principal component values of each kind and then cluster analysis was done with nearest neighbor way. [ Conclusion] Ecological factor was also an important aspect of assortment.展开更多
基金Project 06JK244 supported by the Special Foundation of Education Department of Shaanxi Province
文摘A thermogravimetric analysis (TG) was conducted to study the thermal decomposition behavior and kinetics of composites from coal and high density polyethylene (HDPE), linear low density polyethylene (LLDPE) or low density polyethylene (LDPE). The results show that coal facilitates melting of the polyethylene before temperatures reach 700 K in nitrogen due to the exothermic effect of coal. Above 700 K, adding coal into the polyethylene will result in smaller maximum rates of mass loss and higher initial mass loss temperatures of the composites. Hence, some chemical interactions, occurring between liquid compounds released in the pyrolysis of the coal and polymer, depend on several factors, such as coal rank and the molecular structure of polymers. Synergetic effects in coal and polymers were also found. Both chemical interactions and synergetic effects control the entire thermal decomposition behavior of compos- ites. The larger the amount of coal in the composites, the greater the decomposition temperature spans and the higher the maximum decomposition temperature, the smaller the devolatilization rates. The effect of coal on the thermal stability of composites lies in the hydrogen acceptor effect of the coals. Thermal decomposition of the coals, the polymers and related composites can be modelled via first order parallel reactions between 563 K and 763 K.
基金funded by the national"863"program(2011AA100305)Zhejiang Province Science and Technology Platform Project(2011E60003)+1 种基金Yangzhou City Science and Technology Plan(YZ2011069)Natural Science Foundation of Jiangsu Province(BK2011431)
文摘[ Objective] The aim was to explore the classification basis of Chinese local chicken for providing theoretical basis of giving full play to the genetic potential, heterosis, new ideas and methods of new varieties and strains breeding, identification and evaluation. [ Method] The multivariate statistical analysis of laying performance and production area ecology of 11 kind of chicken was done by principal component analysis and cluster analysis. E]Result] The cluster analysis of 4 egg laying performance indexs indicated that 11 kinds of chicken can be roughly classified into large chicken and small chicken; 10 indexs of multivariate statistical analysis indicated that 11 kinds of chicken can be classified into high altitude type and low altitude type when first 3 eigenvalues were selected as 3 principal component by principal component analysis（ 94.99% of the total amount of information）, and similarity coefficient was computed according to first three principal component values of each kind and then cluster analysis was done with nearest neighbor way. [ Conclusion] Ecological factor was also an important aspect of assortment.
