Genetic diversity and genetic differentiation of natural populations of Pinus kesiya var. langbinanensis were examined by means of electrophoresis technique. Analysis of 9 enzyme systems including 16 loci showed that ...Genetic diversity and genetic differentiation of natural populations of Pinus kesiya var. langbinanensis were examined by means of electrophoresis technique. Analysis of 9 enzyme systems including 16 loci showed that all the three natural popu-lations of the pine were high in genetic diversity but low in inter-population genetic differentiation. The proportion of polymorphic loci is 0.667, with each locus holding 2.13 alleles, averagely. The average expected and observed heterozygosity was 0.288 and 0.197, respectively. The gene differentiation among populations was 0.052, but the mean genetic distance was only 0.015.展开更多
The purpose of this study was to consider the relevance of CARICOM＇s existence to the Virgin Islands （BVI）. Its relevance becomes more significant to the BVI and the Caribbean, by extension, when the globalization ...The purpose of this study was to consider the relevance of CARICOM＇s existence to the Virgin Islands （BVI）. Its relevance becomes more significant to the BVI and the Caribbean, by extension, when the globalization phenomenon is applied; a phenomenon that has been in existence for centuries. Overall, the study concluded that even though the BVI remains only an associate member of CARICOM and not of CSME, it still has an interest in the progress of the regional grouping and its trade initiatives. Over the years, CARICOM has been struggling with its identity as a unified grouping. Nonetheless, it was found that in an effort to combat the trade liberalization process, the grouping must find that inner connection to advance its agenda on the global stage. Accordingly, it has been suggested that CARICOM begin to focus on its strengths and opportunities in order for economic development across the region to occur. It has also been recommended that more serious considerations be taken towards the development of a comprehensive regional market for the trading of goods and services, that is, the Caribbean Single Market and Economy （CSME）. To substantiate its findings, the paper used the qualitative research approach, combined with a situation （SWOT） analysis.展开更多
To improve the operational efficiency of global optimization in engineering, Kriging model was established to simplify the mathematical model for calculations. Ducted coaxial-rotors aircraft was taken as an example an...To improve the operational efficiency of global optimization in engineering, Kriging model was established to simplify the mathematical model for calculations. Ducted coaxial-rotors aircraft was taken as an example and Fluent software was applied to the virtual prototype simulations. Through simulation sample points, the total lift of the ducted coaxial-rotors aircraft was obtained. The Kriging model was then constructed, and the function was fitted. Improved particle swarm optimization(PSO) was also utilized for the global optimization of the Kriging model of the ducted coaxial-rotors aircraft for the determination of optimized global coordinates. Finally, the optimized results were simulated by Fluent. The results show that the Kriging model and the improved PSO algorithm significantly improve the lift performance of ducted coaxial-rotors aircraft and computer operational efficiency.展开更多
基金his article was supported by the Natural Science Founda-tion of Yunnan Province (No.98C017Q).
文摘Genetic diversity and genetic differentiation of natural populations of Pinus kesiya var. langbinanensis were examined by means of electrophoresis technique. Analysis of 9 enzyme systems including 16 loci showed that all the three natural popu-lations of the pine were high in genetic diversity but low in inter-population genetic differentiation. The proportion of polymorphic loci is 0.667, with each locus holding 2.13 alleles, averagely. The average expected and observed heterozygosity was 0.288 and 0.197, respectively. The gene differentiation among populations was 0.052, but the mean genetic distance was only 0.015.
文摘The purpose of this study was to consider the relevance of CARICOM＇s existence to the Virgin Islands （BVI）. Its relevance becomes more significant to the BVI and the Caribbean, by extension, when the globalization phenomenon is applied; a phenomenon that has been in existence for centuries. Overall, the study concluded that even though the BVI remains only an associate member of CARICOM and not of CSME, it still has an interest in the progress of the regional grouping and its trade initiatives. Over the years, CARICOM has been struggling with its identity as a unified grouping. Nonetheless, it was found that in an effort to combat the trade liberalization process, the grouping must find that inner connection to advance its agenda on the global stage. Accordingly, it has been suggested that CARICOM begin to focus on its strengths and opportunities in order for economic development across the region to occur. It has also been recommended that more serious considerations be taken towards the development of a comprehensive regional market for the trading of goods and services, that is, the Caribbean Single Market and Economy （CSME）. To substantiate its findings, the paper used the qualitative research approach, combined with a situation （SWOT） analysis.
基金Project(2013AA063903)supported by High-tech Research and Development Program of China
文摘To improve the operational efficiency of global optimization in engineering, Kriging model was established to simplify the mathematical model for calculations. Ducted coaxial-rotors aircraft was taken as an example and Fluent software was applied to the virtual prototype simulations. Through simulation sample points, the total lift of the ducted coaxial-rotors aircraft was obtained. The Kriging model was then constructed, and the function was fitted. Improved particle swarm optimization(PSO) was also utilized for the global optimization of the Kriging model of the ducted coaxial-rotors aircraft for the determination of optimized global coordinates. Finally, the optimized results were simulated by Fluent. The results show that the Kriging model and the improved PSO algorithm significantly improve the lift performance of ducted coaxial-rotors aircraft and computer operational efficiency.
