In recent years, aluminum alloy profiles have been applied more and more widely in the industrial field, and more frequently in automobile, aerospace, electronics and other industries. At present, in the aluminum prof...In recent years, aluminum alloy profiles have been applied more and more widely in the industrial field, and more frequently in automobile, aerospace, electronics and other industries. At present, in the aluminum profile manufacturing enterprises in our country, there are some problems in the processing of industrial aluminum profiles, such as insufficient research and development capacity and imperfect equipment, which seriously restrict the development of the processing and production of industrial aluminum profiles in our country. This paper discusses the characteristics, application, production process and key points in the production process of industrial aluminum alloy profiles, and realizes the process requirements of subsequent mechanical processing by optimizing the process and designing and manufacturing tooling tools!展开更多
Phylogenetic tree of coronaviruses (CoVs) including the human SARS-associated virus is reconstructed from complete genomes by using our newly developed K- string composition approach. The relation of the human SARS-Co...Phylogenetic tree of coronaviruses (CoVs) including the human SARS-associated virus is reconstructed from complete genomes by using our newly developed K- string composition approach. The relation of the human SARS-CoV to other coronaviruses, i.e. the rooting of the tree is suggested by choosing an appropriate outgroup. SARS-CoV makes a separate group closer but still distant from G2 (CoVs in mammalian host). The relation between different isolates of the human SARS virus is inferred by first constructing an ultrametric distance matrix from counting sequence variations in the genomes. The resulting tree is consistent with clinic relations between the SARS-CoV isolates. In addition to a larger variety of coronavirus genomes these results provide phylogenetic knowledge based on independent novel methodology as compared to recent phylogenetic studies on SARS-CoV.展开更多
文摘In recent years, aluminum alloy profiles have been applied more and more widely in the industrial field, and more frequently in automobile, aerospace, electronics and other industries. At present, in the aluminum profile manufacturing enterprises in our country, there are some problems in the processing of industrial aluminum profiles, such as insufficient research and development capacity and imperfect equipment, which seriously restrict the development of the processing and production of industrial aluminum profiles in our country. This paper discusses the characteristics, application, production process and key points in the production process of industrial aluminum alloy profiles, and realizes the process requirements of subsequent mechanical processing by optimizing the process and designing and manufacturing tooling tools!
文摘Phylogenetic tree of coronaviruses (CoVs) including the human SARS-associated virus is reconstructed from complete genomes by using our newly developed K- string composition approach. The relation of the human SARS-CoV to other coronaviruses, i.e. the rooting of the tree is suggested by choosing an appropriate outgroup. SARS-CoV makes a separate group closer but still distant from G2 (CoVs in mammalian host). The relation between different isolates of the human SARS virus is inferred by first constructing an ultrametric distance matrix from counting sequence variations in the genomes. The resulting tree is consistent with clinic relations between the SARS-CoV isolates. In addition to a larger variety of coronavirus genomes these results provide phylogenetic knowledge based on independent novel methodology as compared to recent phylogenetic studies on SARS-CoV.
