作者机构：
[Li, Ruilian; Wu, XW; Wu, Yuping; Zhang, Xiumei; Wu, Xiongwei; Mo, Jun; Zhou, Chunjiao; Liu, Junjie] Hunan Agr Univ, Coll Plant Protect, Coll Agron, Coll Sci,Natl Res Ctr Engn Technol Utilizat Funct, Changsha 410128, Hunan, Peoples R China.;[Yu, Jingang; Wang, Zhian] Cent S Univ, Sch Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;[Liu, Zaichun; Yuan, Xinhai; Wu, Yuping] Nanjing Tech Univ, Sch Energy Sci & Engn, Nanjing 211816, Jiangsu, Peoples R China.;[Liu, Zaichun; Yuan, Xinhai; Wu, Yuping] Nanjing Tech Univ, Inst Electrochem Energy Storage, Nanjing 211816, Jiangsu, Peoples R China.;[Wu, Xiongwei] Hunan Prov YinFeng New Energy Co LTD, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Li, RL; Wu, XW; Wu, YP; Wu, Xiongwei] H;[Wu, Yuping] N;Hunan Agr Univ, Coll Plant Protect, Coll Agron, Coll Sci,Natl Res Ctr Engn Technol Utilizat Funct, Changsha 410128, Hunan, Peoples R China.;Nanjing Tech Univ, Sch Energy Sci & Engn, Nanjing 211816, Jiangsu, Peoples R China.;Nanjing Tech Univ, Inst Electrochem Energy Storage, Nanjing 211816, Jiangsu, Peoples R China.
关键词：
lithium ion batteries;anode material;Li_3VO_4;modification;electrochemical performance
摘要：
Vanadium oxide Li_3VO_4 has attracted much attention as anode material for Li-ion batteries in recent years since it has a low and safe redox potential (vs. Li metal), high specific capacity and its cost is low. However, the poor electronic conductivity and initial low coulombic efficiency limit its practical application. In this mini-review, the state-of-the-art results associated with Li_3VO_4 are summarized including structure, lithium insertion mechanism, preparation, modification, and electrochemical properties. Finally, the challenges and prospects are also discussed.
作者机构：
[王海宁; 方海泉; 薛惠锋] Graduate School, China Aerospace Academy of Systems Science and Engineering, Beijing, 100048, China;[万毅] Water Resources Management Center, Ministry of Water Resources, Beijing, 100053, China;[周铁军] College of Science, Hunan Agricultural University, Changsha, 410128, China;[蒋云钟] Institute of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing, 100038, China
关键词：
Rice;Yield;Fertilizer;Nitrogen use efficiency
摘要：
Fertilizer plays an important role in increasing rice yield. More than half of all fertilizer applied to the field is not taken up, resulting in environmental damage and substantial economic losses. To address these concerns, a low-cost, coated compound fertilizer named “Xiang Nong Da” (XND), requiring only a single basal application, was studied. A two-year field experiment was conducted to test the effects of XND application on rice yield and nitrogen fertilizer use efficiency. An ordinary uncoated compound fertilizer (UNCF), with 20% more nutrients and split application was selected as the control. The yield of XND-treated rice was only 3.1% lower than that of the control, an insignificant difference. There were no significant differences between N use efficiency indices of the two fertilizer treatments except for N partial factor productivity (PFP_N). PFP_N of XND treatment was 19.7%–23.2% higher than the control, a significant difference. This result indicates that a 20%decrease inNapplication rate is possible with XND without yield reduction and with savings in both labor and time.
作者机构：
[李建辉; 张永棠] Department of Computer Science and Technology, Guangdong Neusoft Institute, Fushan;Guangdong;528225, China;[王访] School of Management, Hunan Agricultural University, Changsha;410000, China
通讯机构：
[Zhang, Y.-T.] D;Department of Computer Science and Technology, Guangdong Neusoft Institute, Fushan, Guangdong, China
摘要：
The single-mode fiber was heated tapering by flame brush method, forming an optical waveguide structure which has a core radius of micro-nanometer level, and the low-loss optical fiber tapered was optimized by the different coefficients of thermal insulation to meet insulation standards. The tapered optical fiber with the best shape was designed, whose constant cone angle is 2 mrad, wavelength is 400 μm and fiber radius is 4 μm. Matlab simulation results show that, the transmission perspective of tapered optical fiber with length of 23 mm is 99.7%, the radiation resistance of tapered optical fiber with length of 63mm is 99.6%. Since the power is coupled to the high-order mode, the loss is sufficiently suppressed, so that the optical coupling transmission of the tapered fiber with a constant taper angle can be achieved without sacrificing the quality of the transmission.
作者机构：
[张琪; 王芳; 刘富安; 罗琳] College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China;[易建龙] Faculty of Science, Hunan Agricultural University, Changsha, 410128, China;[魏建宏] College of Biological Science and Technology, Hunan Agricultural University, Changsha, 410128, China
通讯机构：
[Luo, L.] C;College of Resources and Environment, Hunan Agricultural University, Changsha, China
