The full scan ESI/MS and ESI/MS2 of N-(O, O-diisopropyl) phosphoryl aromatic amino acids (DIPPAAAs), N-(O, O-diisopropyl) phosphoryl phenylalanine, N-(O, O-diisopropyl) phosphoryl tryptophan and N-(O, O-diisopropyl) p...The full scan ESI/MS and ESI/MS2 of N-(O, O-diisopropyl) phosphoryl aromatic amino acids (DIPPAAAs), N-(O, O-diisopropyl) phosphoryl phenylalanine, N-(O, O-diisopropyl) phosphoryl tryptophan and N-(O, O-diisopropyl) phosphoryl tyrosine, were obtained. The specific ions for them were found. Their stability in the LC mobile phase was investigated using developed HPLC/UV/ESI/MS and the results demonstrated that the DIPPAAAs were stable in the mobile phase (5 mmol/L NH4Ac-MeCN (80:20,v/v, pH7.5) within 48 h.展开更多
Dance and music undoubtedly occupy a very important position in the form of cultural and artistic expression. Through the dancer's body movements and the wonderful music rhythm, the dance can let the audience have...Dance and music undoubtedly occupy a very important position in the form of cultural and artistic expression. Through the dancer's body movements and the wonderful music rhythm, the dance can let the audience have a strong visual experience and fully appreciate the beauty contained therein. Music, on the other hand, enables the audience to have a sense of beauty through sound. There is a deep correlation between the two. Dance needs music to help it control the rhythm, and at the same time, the use of music melody can make the dance performance richer. Music performance is often monotonous. If it can be combined with dance, it will certainly increase the appeal of music, make music works more expressive, and fully express the emotion and theme in music works. Therefore, in high school teaching, the organic combination of music and dance can enable students to deepen their understanding of music and dance, enable students to learn better, and thus further improve students' learning effect. Based on this, this article studies the practice of dance teaching in high school music curriculum for reference.展开更多
New stability conditions for complex switched systems are presented. We propose the concepts of attractive region and semi-attmctive region, which are used as a tool for analyzing the stability of switched systems wit...New stability conditions for complex switched systems are presented. We propose the concepts of attractive region and semi-attmctive region, which are used as a tool for analyzing the stability of switched systems with unstable subsystems. Based on attractive region the sufficient conditions with less conservative for stability of switched systems have been established, """"there is no limitation for all members of the system set to be stable. Since our results have considered and utilized the decreasing span of oscillating solutions of the switched systems, they are more practical than the other presented ones of stability of switched systems, and need not resort to multiple Lyapunov functions.展开更多
文摘The full scan ESI/MS and ESI/MS2 of N-(O, O-diisopropyl) phosphoryl aromatic amino acids (DIPPAAAs), N-(O, O-diisopropyl) phosphoryl phenylalanine, N-(O, O-diisopropyl) phosphoryl tryptophan and N-(O, O-diisopropyl) phosphoryl tyrosine, were obtained. The specific ions for them were found. Their stability in the LC mobile phase was investigated using developed HPLC/UV/ESI/MS and the results demonstrated that the DIPPAAAs were stable in the mobile phase (5 mmol/L NH4Ac-MeCN (80:20,v/v, pH7.5) within 48 h.
文摘Dance and music undoubtedly occupy a very important position in the form of cultural and artistic expression. Through the dancer's body movements and the wonderful music rhythm, the dance can let the audience have a strong visual experience and fully appreciate the beauty contained therein. Music, on the other hand, enables the audience to have a sense of beauty through sound. There is a deep correlation between the two. Dance needs music to help it control the rhythm, and at the same time, the use of music melody can make the dance performance richer. Music performance is often monotonous. If it can be combined with dance, it will certainly increase the appeal of music, make music works more expressive, and fully express the emotion and theme in music works. Therefore, in high school teaching, the organic combination of music and dance can enable students to deepen their understanding of music and dance, enable students to learn better, and thus further improve students' learning effect. Based on this, this article studies the practice of dance teaching in high school music curriculum for reference.
文摘New stability conditions for complex switched systems are presented. We propose the concepts of attractive region and semi-attmctive region, which are used as a tool for analyzing the stability of switched systems with unstable subsystems. Based on attractive region the sufficient conditions with less conservative for stability of switched systems have been established, """"there is no limitation for all members of the system set to be stable. Since our results have considered and utilized the decreasing span of oscillating solutions of the switched systems, they are more practical than the other presented ones of stability of switched systems, and need not resort to multiple Lyapunov functions.
