The study by H.X.Zhang shows that in order to suppress the spurious oscillation at both upstream and downstream of the shock, the coefficient of the third_order derivative on the right hand side of the modified equati...The study by H.X.Zhang shows that in order to suppress the spurious oscillation at both upstream and downstream of the shock, the coefficient of the third_order derivative on the right hand side of the modified equation of the difference scheme must be positive upstream and negative downstream of the shock. According to this principle, a new non_oscillatory, containing no free parameters and dissipative difference scheme of second_order both in time and space is proposed. It is proved that this scheme possesses TVD property and is generalized Gudunov scheme of second_order. In the presence of the shock wave in the flow field, this scheme is the generalization and improvement of the Lax_Wendroff scheme. Several numerical examples are given which demonstrate that the proposed scheme is non_oscillatory of high order accuracy and high resolution. It also has the advantages of compact form, greater maximum allowable Courant number and convenient to use.展开更多
Dear Editor, We thank the author for making meaningful comments on our recent article [1]. The SNP 772G 〉 A （rs602662） in exon 2 of the gene encoding fucosyl transferase （FUT2） has been found to be related with t...Dear Editor, We thank the author for making meaningful comments on our recent article [1]. The SNP 772G 〉 A （rs602662） in exon 2 of the gene encoding fucosyl transferase （FUT2） has been found to be related with the alterations in plasma vitamin B12 levels. GG carriers possessed lower levels of vitamin B12. However, we didn＇t know the mechanism behind this association.展开更多
Dear Editor, I would like to offer some comments on the excellent article by Hai-Yan He and colleagues published in Genomics, Proteomics ＆ Bioinformatics on 1st April 2017 [1]. The authors include, in the list of gen...Dear Editor, I would like to offer some comments on the excellent article by Hai-Yan He and colleagues published in Genomics, Proteomics ＆ Bioinformatics on 1st April 2017 [1]. The authors include, in the list of genetic polymorphisms that have an effect on vita- mins, the low concentrations of cellular and plasma vitamin B12 in GG carriers of SNP rs602662 （772 G 〉 A） in the gene encoding fucosyltransferase 2 （FUT2）.展开更多
文摘The study by H.X.Zhang shows that in order to suppress the spurious oscillation at both upstream and downstream of the shock, the coefficient of the third_order derivative on the right hand side of the modified equation of the difference scheme must be positive upstream and negative downstream of the shock. According to this principle, a new non_oscillatory, containing no free parameters and dissipative difference scheme of second_order both in time and space is proposed. It is proved that this scheme possesses TVD property and is generalized Gudunov scheme of second_order. In the presence of the shock wave in the flow field, this scheme is the generalization and improvement of the Lax_Wendroff scheme. Several numerical examples are given which demonstrate that the proposed scheme is non_oscillatory of high order accuracy and high resolution. It also has the advantages of compact form, greater maximum allowable Courant number and convenient to use.
基金supported by grants from the National Key Research and Development Program(Grant No.2016YFC0905000)National High-tech R&D Program of China(863 Program+2 种基金Grant No.2012AA02A518)National Natural Scientific Foundation of China(Grant Nos.81522048,81573511,81273595)the Innovation-driven Project of Central South University,China(Grant No.2016CX024)
文摘Dear Editor, We thank the author for making meaningful comments on our recent article [1]. The SNP 772G 〉 A （rs602662） in exon 2 of the gene encoding fucosyl transferase （FUT2） has been found to be related with the alterations in plasma vitamin B12 levels. GG carriers possessed lower levels of vitamin B12. However, we didn＇t know the mechanism behind this association.
文摘Dear Editor, I would like to offer some comments on the excellent article by Hai-Yan He and colleagues published in Genomics, Proteomics ＆ Bioinformatics on 1st April 2017 [1]. The authors include, in the list of genetic polymorphisms that have an effect on vita- mins, the low concentrations of cellular and plasma vitamin B12 in GG carriers of SNP rs602662 （772 G 〉 A） in the gene encoding fucosyltransferase 2 （FUT2）.
