http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Junjie Xie,Yichen Chang,Tao Meng 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.12
In this paper, the influences of stray capacitances are explored for various parallel arrangements of primary windings (PWs) in input-series transformer-integration (ISTI) flyback converters. On this basis, selecting the principle of the basic parallel PWs arrangements is clarified in the design process. First, the influences caused by the energy changes of stray capacitances are analyzed for PWs in ISTI converter. Based on this, the arrangements of single PWs and various parallel PWs are presented. Second, the energy influences of both the inner and inter-winding capacitances are analyzed and compared for two basic parallel PWs in an ISTI converter. In addition, selecting the principle of these PWs arrangements is summarized. Finally, four integrated transformers with various PW arrangements are designed, and experimental comparisons are implemented on a 1000 Vdc/48 W ISTI flyback converter. Through the obtained results, the validity of theoretical analysis is verified.
Yi Chen,Mingyong Xie,Wenjuan Li,Hui Zhang,Shaoping Nie,Yuanxing Wang,Chang Li 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.1
Deproteinization procedure is a fundamental step for analyzing polysaccharide from natural plants. In this study, in the course of refining bioactive polysaccharides from lingzhi (Ganoderma atrum), an effective deproteinization method using lead acetate solution was established by comparing with other available methods. The percentages of deproteinization, polysaccharide loss, and its antioxidant activities loss were used as the index to evaluate and optimize the precipitation experimental conditions. The results showed that the modified method, precipitation with the addition of 0.4-0.52%(w/v) lead acetate, was superior to the others, as evidenced by the highest deproteinization efficiency (88%), as well as the lowest polysaccharide loss (17%). And notably its antioxidant activity also remained good (loss 15%). It provides a simple prefractionation step for the analysis of polysaccharide from natural plants. Polysaccharide isolated by this method is in the native state. Our method may offer a rapid method for removing protein from plant polysaccharides in large scale.