Vocal music, as one of the carriers of shaping the humanistic and emotional world and the spiritual world at the present stage, has attracted more and more people's attention. However, judging from the actual situ...Vocal music, as one of the carriers of shaping the humanistic and emotional world and the spiritual world at the present stage, has attracted more and more people's attention. However, judging from the actual situation of vocal performance at this stage, some vocal performers do not pay much attention to their own performing arts, and only use their own voice to express the emotion of the work. This way is difficult to further explore the emotion of the work and affects the performance quality of the work. At this stage, vocal music performers need to improve their understanding of performing arts, actively integrate performing arts into vocal music performance, improve the overall quality of vocal music performance and provide viewers with higher-quality audio-visual enjoyment.展开更多
Conversion of cellulose into platform chemical 5-hydroxymethylfurfural （HMF） in water-tetrahydrofuran （THF） co-solvents under acidic condition was studied. 38.6% of HMF was obtained with low cellulose concentratio...Conversion of cellulose into platform chemical 5-hydroxymethylfurfural （HMF） in water-tetrahydrofuran （THF） co-solvents under acidic condition was studied. 38.6% of HMF was obtained with low cellulose concentration of 2.4wt%, but levulinic acid （LA） and solid humins became the main products with high cellulose concentration. The soluble byproducts were analyzed by high performance liquid chromatography/multiple stage tandem mass spec-trometry, and chemicals with formula of C9H16O4、 C10H14O4、 C11H12O4、C12H10O5 and C12H16O8 were detected. THF could participate in the reaction via ring-opening into 1,4-butanediol followed by esterification with LA into C9H16O4 or etherification with HMF into C10H14O4. C11H12O4 was formed by esterification of HMF with LA, C12H10O5 was formed by self-etherification of HMF, while C12H16O8 was formed by acetalization of HMF with glucose. Self-etherification of HMF and etherification of HMF with 1,4-butanediol were identified as two main side reactions.展开更多
文摘Vocal music, as one of the carriers of shaping the humanistic and emotional world and the spiritual world at the present stage, has attracted more and more people's attention. However, judging from the actual situation of vocal performance at this stage, some vocal performers do not pay much attention to their own performing arts, and only use their own voice to express the emotion of the work. This way is difficult to further explore the emotion of the work and affects the performance quality of the work. At this stage, vocal music performers need to improve their understanding of performing arts, actively integrate performing arts into vocal music performance, improve the overall quality of vocal music performance and provide viewers with higher-quality audio-visual enjoyment.
基金This work was supported by the National Basic Research Program of China （No.2012CB215304）, the National Natural Science Foundation of China （No.51376185 and No.51161140331）, and the Natural Science Foundation of Guangdong Province （No.S2013010011612）.
文摘Conversion of cellulose into platform chemical 5-hydroxymethylfurfural （HMF） in water-tetrahydrofuran （THF） co-solvents under acidic condition was studied. 38.6% of HMF was obtained with low cellulose concentration of 2.4wt%, but levulinic acid （LA） and solid humins became the main products with high cellulose concentration. The soluble byproducts were analyzed by high performance liquid chromatography/multiple stage tandem mass spec-trometry, and chemicals with formula of C9H16O4、 C10H14O4、 C11H12O4、C12H10O5 and C12H16O8 were detected. THF could participate in the reaction via ring-opening into 1,4-butanediol followed by esterification with LA into C9H16O4 or etherification with HMF into C10H14O4. C11H12O4 was formed by esterification of HMF with LA, C12H10O5 was formed by self-etherification of HMF, while C12H16O8 was formed by acetalization of HMF with glucose. Self-etherification of HMF and etherification of HMF with 1,4-butanediol were identified as two main side reactions.
