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Shaoan Zhang,Yuanxing Li,Wenfeng Li,Zhenzhang Li,Minfan Qiu,Zhongfei Mu,Yang Li,Yihua Hu 한국물리학회 2019 Current Applied Physics Vol.19 No.9
High brightness and precise adjustment of luminescence colour of phosphors are two main targets in the research of phosphor-converted white LEDs. However, few feasible strategy can be employed to achieve the multicolortunable luminescence under the premise of maintaining high quantum efficiency. Here, we demonstrate a highefficiency energy-transfer process from Tb3+ to Eu3+ ions with a higher luminescent quantum efficiency (64.5% and 53.4%, respectively), and green-red multicolor emission in Lu2GeO5 host via varying the doping content of Tb3+ and Eu3+ ions. Besides, Lu2GeO5:Tb3+, Lu2GeO5: Eu3+ and Lu2GeO5: Tb3+, Eu3+ all exhibit weak thermal quenching which ensures the stable use of white LED device in the high temperature environment. This paper provides a novel multicolor-tunable phosphor with high brightness, efficient energy transfer and weak thermal quenching, which presents a potential application for UV-converted white LEDs.
Yuanxing Dai,Yanming Fu,Baichun Li,Xuezhi Wang,Tianbiao Yu,Wanshan Wang 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.11
Most mechanism contains one or more joints. However, joint clearances which cannot be dislodged make accuracy analysis become complicated. In order to seek a method to investigate the impact of joint clearances on the accuracy of a parallel robot, this paper deals with the 3-SPS-1-S spatial parallel robot’s pose error predicting and sensitivity analyzing. In this paper, a nonlinear method for evaluating the sources of the pose errors is proposed on the condition that the pose errors only come from joint clearances. Firstly, based on the nonlinear contact modes inside the joints, the error equivalent method is outlined for spherical joint and sliding pair. Then the pose error distribution over its workspace is presented. Secondly, those areas where the pose errors present abnormally changing are analyzed. Thirdly, sensitivity models are defined to evaluate how much the external variable load affects the pose errors. Finally, the simulation results, which are consistent with the structural characteristics of the 3-SPS-1-S spatial parallel robot, proved the validity of the equivalent method proposed in this paper.
Shaomei Liu,Jiaxin Li,Yuan Wu,Yanna Ren,Qi Liu,Qiyao Wang,Xiangshan Zhou,Menghao Cai,Yuanxing Zhang 한국유전학회 2017 Genes & Genomics Vol.39 No.3
Aspergillus glaucus HB1-19 is a typical marinederived fungus preferring the dependence on sea water for its growth, asexual development and polyketides biosynthesis. Therein, salt stress greatly functions even in superior to light illumination, which is also a critical regulation signal for fungi. Here, comparative RNA-seq analysis of this strain was performed under conditions of saltstress ? dark (group A), non salt-stress ? dark (group B), salt-stress ? light (group C). The RNA-seq generated a total of 19,024 unigenes with an average length of 1415 bp. Differentially expressed genes were very similar between group A and group C but greatly differed between group A and group B, proving that salt stress functioned superior to light illumination globally. Salt stress highly enhanced primary metabolism and activated Ras and MAPK signaling pathways. There seems no direct interaction between asexual development and polyketides biosynthesis. Salt stress inhibited terpenoids biosynthesis but showed little influences on polyketide pathway as well as other secondary metabolism pathways. These findings provide a better understanding of marine fungi adapting to marine environment. Also, it indicates that the so-called ‘salt stress-induced’ may truly be a ‘metal ions-induced’ for biosynthesis of secondary metabolites in marine fungi.
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.