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Articles by Yun Zhao
Total Records ( 3 ) for Yun Zhao
  Yun Zhao , Ming Ma and Xianglin Li
  This study researched four grasses: Hordeum brevisubulatum, Roegneria turczaninovii, Bromus inermis and Elymus nutans. The study was conducted in 2006-2007 in Inner Mongolia at the Linxi seed field; it assessed the development the different growth stages of plant nutrients and analyzed plant stems and leaves of nutrients as well as their amino acid values (amino acid ratio coefficient). The results were as follows: over the entire growth period, the crude fiber content in all four types of grass changed the magnitude of coarse protein as the grass grew and its content was gradually increased. Crude ash and crude fat content barely changed during the entire growth period. The study analyzed the nutrition of the four grasses. The results showed that Hordeum brevisubulatum contained moderate levels of calcium and high phosphorus. Roegneria turczaninovii, Elymus nutans and Bromus inermis all contained low levels of calcium and moderate phosphorus. The ratios of calcium and phosphorus of Hordeum brievisubulatum and Roegneria turczaninovii were in the perfect range but those of Elymus nutans and Bromus inermis were not. EAAI values of the four grasses were higher than 0.95 indicating that the grasses were well-fed.
  Yun Zhao , Jin-Lan Ruan , Jin-Hui Wang , Yue Cong , Shuang Song , Ya-Ling Cai , Wei Fang and Dao-Nian Zhou
  3β-Acetoxy-(20S, 22E)-dammaran-22-en-25-ol, a new triterpene, was isolated along with five known triterpenes (ursolic acid, oleanolic acid, betulinic acid, 3-epiocotillol acetate, and dimmarenediol II acetate), and α-D-glc and sucrose from Radix Ranunculus ternati All of them, except oleanolic acid and α-D-glc, were isolated from the family of Ranunculaceae for the very first time, and the NMR data of sucrose was first described. In addition, the absolute configurations of α-D-glc and the glucose component of sucrose were determined.
  Yun Zhao , Zhiyuan Xie , Yao Qu , Yanhou Geng and Lixiang Wang
  We have investigated the effects of thermal annealing before and after cathode deposition on poly(3-hexylthiophene) (P3HT)/[6,6]–phenyl C61-butyric acid methyl ester (PCBM) blend photovoltaic cells with different cathode buffer layers. The introduction of cathode buffer layer such as lithium fluoride (LiF) and calcium oxide (CaO) in pre-annealing cells can increase the open-circuit voltage (Voc) and the power conversion efficiency (PCE). Post thermal annealing after cathode deposition further enhanced the PCE of the cells with LiF/Al cathode, whereas the performance of the cell with CaO/Al cathode is decreased. It is found that the Voc and PCE can be largely enhanced when the post-annealed cell with Ca/Al cathode is exposed in air. This may attribute to the formation of CaO buffer layer, which favors increasing shunt resistance and Voc. Finally, a PCE of 4.60% is calculated under AM1.5G solar illumination at 100 mW/cm2.
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