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Chunxiu Shen,Zhiqun Que,Yumei Xia,Ning Tang,Ding Li,Ronghua He,Mengliang Cao 한국식물학회 2017 Journal of Plant Biology Vol.60 No.6
Plant annexins are Ca2+-dependent phospholipidbindingproteins and exist as multigene families in plants. They are implicated in the regulation of plant developmentas well as protection from environmental stresses. In thisstudy, the rice annexin gene OsAnn3 knockout was performedvia the CRISPR/Cas9 (clustered regularly interspaced shortpalindromic repeats/CRISPR associated proteins) mediatedgenome editing. Thus, mutant plantlets were successfullyobtained. We identified cold tolerance phenotype of T1mutant lines from T0 biallelic mutants using the 4~6°C for 3days cold treatment. The results showed that REC (the relativeelectrical conductivity) of T1 mutant lines was increased, andthe survival ratio of T1 mutant lines was decreased dramaticallycompared with the wild type after the exposure to coldtreatment. It was suggested that OsAnn3 was involved in coldtolerance of rice.
Shi, Yifeng,Hua, Chunxiu,Li, Bin,Fang, Xiangpeng,Yao, Chaohua,Zhang, Yichi,Hu, Yong‐,Sheng,Wang, Zhaoxiang,Chen, Liquan,Zhao, Dongyuan,Stucky, Galen D. WILEY‐VCH Verlag 2013 Advanced functional materials Vol.23 No.14
<P><B>Abstract</B></P><P>Highly ordered mesoporous crystalline MoSe<SUB>2</SUB> is synthesized using mesoporous silica SBA‐15 as a hard template via a nanocasting strategy. Selenium powder and phosphomolybdic acid (H<SUB>3</SUB>PMo<SUB>12</SUB>O<SUB>40</SUB>) are used as Se and Mo sources, respectively. The obtained products have a highly ordered hexagonal mesostructure and a rod‐like particle morphology, analogous to the mother template SBA‐15. The UV‐vis‐NIR spectrum of the material shows a strong light absorption throughout the entire visible wavelength region. The direct bandgap is estimated to be 1.37 eV. The high surface area MoSe<SUB>2</SUB> mesostructure shows remarkable photocatalytic activity for the degradation of rhodamine B, a model organic dye, in aqueous solution under visible light irradiation. In addition, the synthesized mesoporous MoSe<SUB>2</SUB> possess a reversible lithium storage capacity of 630 mAh g<SUP>−1</SUP> for at least 35 cycles without any notable decrease. The rate performance of mesoporous MoSe<SUB>2</SUB> is much better than that of analogously synthesized mesoporous MoS<SUB>2</SUB>, making it a promising anode for the lithium ion battery.</P>
Nano-scale study on molecular structure, thermal stability, and mechanical properties of geopolymer
Li Wei,Wang Yunkai,Yu Chunxiu,He Zijuan,Zuo Chuan,Yu Yang 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.2
The well thermal stability and mechanical properties of geopolymer can be attributed to its predominant adhesive constituent, sodium alumino-silicate hydrate (N-A-S-H). However, the intrinsic relation between molecular structure, stoichiometry, and performance of N-A-S-H is far from being understood. Herein, the structure, thermal stability, and tensile behavior of N-A-S-H at different Si/Al ratio are investigated by means of ReaxFF molecular dynamics. The results show that, after extreme low/high temperature treatment, the atomic configuration can also recover to a large extent. The hydrolysis during high temperature treatment slightly inhibits the structure recovery. Its expansion strain at elevated temperature is much smaller than that of calcium silicate hydrate, the primary component of Portland cement. Aluminum addition diminishes alumino-silicate skeleton’s connectivity and promotes the formation of energetically unstable Al–O–Al bonds, resulting in the drop of thermal stability and mechanical properties. The consistence between simulations and experiments demonstrates the considerable function of molecular structure of N-A-S-H for the macro-performance of geopolymer.
Fang, Xiangpeng,Guo, Xianwei,Mao, Ya,Hua, Chunxiu,Shen, Lanyao,Hu, Yongsheng,Wang, Zhaoxiang,Wu, Feng,Chen, Liquan Wiley-VCH 2012 Chemistry, an Asian journal Vol.7 No.5
<P>The most-popular strategy to improve the cycling stability and rate performance of the sulfur electrode in lithium-sulfur (Li-S) batteries is to astrict the sulfur in a conducting medium by using complicated chemical/physical processing. Lithium sulfide (Li(2)S) has been proposed as an alternative electrode material to sulfur. However, for its application, it must meet challenges such as high instability in air together with all of the drawbacks of a sulfur-containing electrode. Herein, we report the feasibility of using Li(2)S, which was obtained by electrochemical conversion of commercial molybdenum disulfide (MoS(2)) into Li(2)S and metallic molybdenium (Mo) at low voltages, as a high-performance active material in Li-S batteries. Metallic Mo prevented the dissolution of lithium polysulfides into the electrolyte and enhanced the conductivity of the sulfide electrode. Therefore, the in situ electrochemically prepared Li(2)S/Mo composite exhibited both high cycling stability and high sulfur utilization.</P>
The Effect of Beta-Herding on Taiwan’s Market: DCC-MIDAS Approach
Yi Chang Chen Cong Huang,Chunxiu Qiu,Yantong Jin,Xinyi Ma 한국유통과학회 2017 KODISA ICBE (International Conference on Business Vol.2017 No.-
The aim of this study is to investigate the herding of beta transmission between return and volatility. We have used the dynamic conditional correlation model with the mixed-data sampling (DCC-MIDAS) model for the analysis. Evidence demonstrates that herding is a key transmitter in Taiwan’s stock market. The significant estimation of DCC-MIDAS explains the herding phenomenon is highly dynamic and time-varying in herding behavior. By means of time-varying beta of herding based on our rolling forecasting method and robustness check of the Markov switching regression approach using four types of portfolios, we find evidence of superior forecasting ability of the model indicates that there are conditional correlations between betas and herding. The evidence also reveals herding formation in Taiwan’s markets during the subprime crisis period.
Enhanced Li storage performance of ordered mesoporous MoO2 via tungsten doping.
Fang, Xiangpeng,Guo, Bingkun,Shi, Yifeng,Li, Bin,Hua, Chunxiu,Yao, Chaohua,Zhang, Yichi,Hu, Yong-Sheng,Wang, Zhaoxiang,Stucky, Galen D,Chen, Liquan RSC Pub 2012 Nanoscale Vol.4 No.5
<P>Ordered mesoporous tungsten-doped MoO(2) was synthesized by a nanocasting method. The Li storage performance of mesoporous MoO(2) is significantly improved by tungsten doping, which exhibits a reversible capacity of 700 mA h g(-1), better cycling and rate performance. This material combines the advantages of the high theoretical capacity of MoO(2) and the better electroactivity of WO(2).</P>
An Image Retrieval Method Based on Visual Dictionary and Saliency Region
Xu Gongwen,Xu Lina,Li Xiaomei,Tang Xiaobing,Wang Xiaoyan,Xu Chunxiu 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.7
An image retrieval method based on the combination of visual dictionary and region of saliency was proposed in this paper, which aims to increase the accuracy of image retrieval. The image is divided into sampled blocks and the low-level features are extracted from these image blocks. Then a variety of features vectors are taken as the input vector for learning its corresponding visual dictionary respectively by non-negative sparse coding. Spatial information is added into the sparse representations of image by proposing the saliency polling method, and the similarity measure between sparse representation vectors is defined as SED (Squared Euclidean Distance), which considering the same nonzero entries and Euclidean distance of vectors at the same time. Results of experiment carried on Corel and Caltech datasets showed that this method can effectively improve the accuracy of image retrieval compared with the methods of single visual dictionary.
Guojun Liu,Fang He,Yan Li,Xinbo Li,Hong Zhao,Conghui Wang,Conghong Zhan,Chunxiu Tang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.8
Based on the liquid-phase reduction mechanism, a controllable synthesis method, which uses piezoelectric-actuated high-frequency vibration self-circulating microfluidic reactor, to prepare silver nanoparticles is proposed. Firstly, the synthesis mechanism of silver nanoparticles and the working principle of the microfluidic reactor were analyzed. Then, in order to study and explore the influence of self-circulating and high frequency vibration on the synthesis of silver nanoparticles, a series of related synthesis experiments were carried out. The synthesized silver nanoparticles were characterized by UV-Visible spectroscopy and transmission electron microscopy. The effects of micropump driving voltage and high-frequency vibration on the synthesis of silver nanoparticles were analyzed. The experiment results show that when the silver nanoparticles were synthesized using piezoelectric-actuated high-frequency vibration self-circulating microfluidic reactor, the higher the driving voltage of the circulating reflux micropump, the faster the vortex rotation speed in the mixing pool and the more uniform the reagent reaction. Besides, high-frequency vibration can suppress the aggregation of silver nanoparticles, and balance the growth environment of particles, which is beneficial to the formation of silver nanoparticles with good monodispersity, high sphericity and small size deviation.