The sequence features of general dinucleotide abundance and dinucleotide abundance based on codon usage are extracted, and then the data sets are classified with different parameters and kernel functions combined with the method of two-fold cross validation.

Two parameters which are designed to describe compositional difference between two DNA sequences and base correlation in DNA sequence are defined,and then the characteristics of variation in composition and base correlation in human processed pseudogenes during evolution are studied.

We have calculated the frequencies of codon usage,the abundance of amino acid of oncogenes and primate sequences.

,the control on MgO content and binary basicity under different cotents of Al_2O_3 in slag are studied through theory study and production practice analysis and the reasonable range of slag content is presented.

Some factors to influence the silicon content of hot metal were proposed on the basis of the experiment in the lab: increasing the binary basicity is favorable to desiliconization;the oxide in slag debases the silicon activity and is of great advantage to desiliconization;Al2O3 and SiO2 are disadvantageous to desilic.