关键词：
Batteries;Green chemistry;Electrochemical energy storage;Electrode materials;Nanomaterials
摘要：
A simple strategy which combines the treatment of industrial wastewater with the preparation of electrode materials was proposed in this work. And the industrial wastewater is the only iron source for the material preparation. The preparation method in this work is facile, economical and environment-friendly which includes two simple steps of low-temperature aqueous solution and one-step calcination. Moreover two kinds of high performance Fe2O3 anode materials (alpha-/gamma-Fe2O3 nano spheres, respectively) with isomerism can be obtained by simply adjusting calcination temperatures. Both of the alpha-Fe2O3 and gamma-Fe2O3 nanospheres show good lithium storing reversibility when used as anode materials in LIBs. Furthermore the as-prepared alpha-Fe2O3 nano-electrode with lower electrochemical impedance exhibit a far better electrochemical performance (about 74.1% capacity retention (calculated based on the lithiation) from the 1st to 5th cycle) than the gamma-one (only 39.0% capacity retention from the 1st to 5th cycle). The results here provide economical yet environment-friendly strategies for developing advanced anode material demanding both high energy and long lifespan for full-cell lithium battery. (C) 2018 Elsevier Ltd. All rights reserved.
会议名称：
5th International Conference on Computer-Aided Design, Manufacturing, Modeling and Simulation (CDMMS)
会议时间：
APR 22-23, 2017
会议地点：
Busan, SOUTH KOREA
会议主办单位：
[Fang, Haiquan;Xue, Huifeng] China Aerosp Acad Syst Sci & Engn, Beijing 100048, Peoples R China.^[Zhou, Tiejun] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
会议论文集名称：
AIP Conference Proceedings
摘要：
The golden section sequence of points was defined, and we found that the logarithmic spiral, golden section sequence, and Fibonacci sequence exhibit a close relationship. We considered infinite sums derived from the reciprocals of the golden section numbers and Fibonacci numbers, and infinite sums derived from the reciprocals of the square of the golden section numbers and Fibonacci numbers. Applying the floor function to the reciprocals of these sums, we determined that they are equal to each other.
会议论文集名称：
DEStech Transactions on Environment Energy and Earth Sciences
摘要：
As cities develop in a fast pace, smart growth has become the goals for the city development of each country. In this paper, we take Atlanta as an example, then we build index assessment system of smart growth, which focus on economic prospection, social equity and environment sustainability (three of "E"). We choose ten typical indexes to measure three of "E" and use all-arranged polygon graphic index method to build smart growth mode. We build linear fitting functions for ten typical indexes respectively with the origin data in Atlanta from 2006 to 2014, then we get the predictable data in 2015 through the linear fitting functions. The next step is to bring this data to the mode and compute comprehensive scores with the year ranging from 2006 to 2015; besides, we compare the score in 2015 with that calculated by actual data. Then we do a significant test for them and the result indicates that the two scores are consistent. Smart growth mode we have built is effective, so we can use it to do prediction for the urban smart growth in the future.
摘要：
We, for the first time, demonstrate a facile preparation of N, O dual-doped carbon felt (CF) as electrodes in all-vanadium redox flow batteries (VRFB). N2 and O2 plasma was employed to treat the CF, introducing nitrogen and oxygen atoms doped into the carbon felt to result in the improved electrocatalytic activity and enhanced interaction of CF-electrolyte during the battery operation. The energy efficiency of the as-assembled VRFB is improved from 65% (pristine) to 78% (doped) at a current density of 50 mA cm-2 with excellent cycling stability.
摘要：
A delay differential equation model of paddy ecosystem was put forward to reveal the interaction among rice, weeds and inorganic fertilizer on the system. The results show that, the system exists a rice and weed extinction equilibrium, and it also exists a rice extinction or weed extinction equilibrium. Their stable and unstable conditions are obtained. Moreover, Hopf bifurcations occur at the rice extinction or weed extinction equilibrium as the delay crosses some critical values. According to the conditions, some measures to increase rice yield were recommended.
摘要：
series of semi-fluorinated sulfonated polyimides (6F-SPIs) are designed and synthesized via a one-step high-temperature polycondensation reaction. The sulfonation degrees of 6F-SPIs are controlled through changing the ratio of sulfonated diamine to non-sulfonated diamine in the casting solution. The physicochemical properties and single cell performance of 6F-SPI membranes are thoroughly evaluated and compared to a non-fluorinated SPI membrane (6H-SPI-50) and a Nafion 115 membrane. The results show that the designed 6F-SPI membrane with a 50% sulfonation degree (6F-SPI-50) possesses the highest proton selectivity (1.613 x 10(5) S min cm(-3)) among all tested membranes. Besides, the 6F-SPI-50 membrane exhibits a promising performance for vanadium redox flow batteries (VRFBs), showing higher coulombic efficiencies (96.90-99.20%) and energy efficiencies (88.25-64.80%) than the Nafion 115 membrane (with coulombic efficiencies of 90.60-96.70% and energy efficiencies of 81.04-60.10%) at the current densities ranging from 20 to 100 mA cm(-2). Moreover, the 6F-SPI-50 membrane shows excellent chemical stability in the VRFB system. This work paves the way for the development of a new class of 6F-SPI membranes for the VRFB application. (C) 2016 Elsevier Ltd. All rights reserved.
摘要：
Plant architecture is an important agronomic trait, and improving plant architecture has attracted the attentions of scientists for decades, particularly studies to create desirable plant architecture of high grain yield through breed and culture practice. However, many important structural phenotypic traits still lack quantitative description and modeling on structural-functional relativity. This study defined new architecture indices derived from digitalized plant architecture and evaluated the variability of these indices among varieties and crop management. Based on those architecture indices, a prediction functions were developed to predict the biomass accumulation. Using these functions, the plant architecture indices can be derived for improving breeding and agronomic management.
会议名称：
Joint Conference of 6th International Congress on Electrical and Engineering (ICECE) / 4th International Conference on Material Science and Manufacturing (ICMSM)
摘要：
To investigate difference of price's dynamic characteristics between different periods in different competitive electricity market, we applied multi fractal detrended moving average analysis (ME-DMA) to analyze multifractal natures of prices on-peak and off-peak of three typical localized electricity markets, namely, Canadian Alberta, Ontario and middle Columbia markets. The results demonstrate that there are huge differences multifractal natures of the prices between different periods in different markets. It provides a new view for uncovering dynamic features of prices in different periods.
关键词：
feedback controls;competitive system;stochastic perturbation;extinction;stability in the mean
摘要：
In this paper,we consider an autonomous LotkaVolterra competitive system with stochastic perturbation and feedback controls.Firstly,we show the existence,the uniqueness and the positivity of the solut
摘要：
In this paper, we define a lower approximate operation and an upper approximate operation based on a Boolean partition on R-0-algebras and discuss their properties. We then introduce a pair of belief measure and plausibility measure on R-0-algebras and investigate the relationship between rough operations and belief measure and plausibility measure.
会议名称：
9th International Conference on Novel Materials and their Synthesis (NMS) / 23rd International Symposium on Fine Chemistry and Functional Polymers (FCFP)
会议时间：
OCT 17-22, 2013
会议地点：
Shanghai, PEOPLES R CHINA
会议主办单位：
[Wu, Xiongwei;Liu, Jun;Xiang, Xiaojuan;Zhang, Jie;Hu, Junping;Wu, Yuping] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.^[Wu, Yuping] Fudan Univ, New Energy & Mat Lab, Shanghai 200433, Peoples R China.^[Wu, Yuping] Fudan Univ, Shanghai Key Lab Mol Catalysis & Innovat Mat, Dept Chem, Shanghai 200433, Peoples R China.
关键词：
energy storage;electrolyte;NMS-IX;supporting electrolyte;vanadium redox flow batteries
摘要：
Vanadium redox flow batteries (VRBs) are one of the most practical candidates for large-scale energy storage. Its electrolyte as one key component can intensively influence its electrochemical performance. Recently, much significant research has been carried out to improve the properties of the electrolytes. In this review, we present the optimization on vanadium electrolytes with sulfuric acid as a supporting electrolyte and their effects on the electrochemical performance of VRBs. In addition, other kinds of supporting electrolytes for VRBs are also discussed. Prospective for future development is also proposed.
会议名称：
9th International Conference on Novel Materials and their Synthesis (NMS) / 23rd International Symposium on Fine Chemistry and Functional Polymers (FCFP)
会议时间：
OCT 17-22, 2013
会议地点：
Shanghai, PEOPLES R CHINA
会议主办单位：
[Wu, Xiongwei;Hu, Junping;Liu, Jun;Zhou, Qingming;Zhou, Wenxin;Li, Huiyong;Wu, Yuping] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.^[Wu, Yuping] Fudan Univ, New Energy & Mat Lab, Shanghai 200433, Peoples R China.^[Wu, Yuping] Fudan Univ, Shanghai Key Lab Mol Catalysis & Innovat Mat, Dept Chem, Shanghai 200433, Peoples R China.^[Wu, Yuping] Hunan Prov Yinfeng New Nenergy Co Ltd, Changsha 410013, Hunan, Peoples R China.
关键词：
energy efficiency;ion exchange membrane;NMS-IX;proton;vanadium redox flow batteries (VRBs);vanadium ion permeability
摘要：
The effects of Ce on microstructure and corrosion resistance of Mg-9Gd-4Y-1Nd-0.6Zr magnesium alloy was investigated by means of scanning electronic microscopy, x-ray diffraction, weight - loss test, electrochemical impedance spectroscopy and potentio-dynamic polarization test. The experimental results showed that Mg-9Gd-4Y-1Nd-0.6Zr alloy with 5% Ce had better corrosion resistance. Its corrosion current density decreased by 55.6%. Its corrosion potential moved positive about 141 mV than that of Mg-9Gd-4Y-1Nd-0.6Zr alloy. It is believed that the corrosion resistance of the Mg alloy was enhanced by volume fraction and distribution change of the second phase particles. The microstructure study showed that the proper amount of Ce addition caused the segregation of the rare earth elements in the Mg alloy along grain boundary as network distribution, and the volume fraction of the second phase particles in the Ce containing Mg-9Gd-4Y-1Nd-0.6Zr alloy increased and their sizes decreased than those in Mg-9Gd-4Y-1Nd-0.6Zr alloy without Ce. (C) 2011 Published by Elsevier Ltd.
摘要：
This paper discusses a discrete predator-prey system with Beddington-DeAngelis function response. Firstly, sufficient conditions are obtained for the permanence of the system. Furthermore, by constructing a suitable Lyapunov function, some sufficient conditions which guarantee the global attractivity of positive equilibrium of the system are established. (C) 2012 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Noorul Islam Centre for Higher Education.
期刊：
Applied Mechanics and Materials,2012年212-213:1062-1066 ISSN：1660-9336
通讯作者：
Zou, Ruibiao
作者机构：
[Zou, Ruibiao] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Yi, Wei; Mou, Zouxin] Sany Heavy Ind Co Ltd, Changde 415001, Peoples R China.
会议名称：
International Conference on Civil, Architectural and Hydraulic Engineering (ICCAHE 2012)
会议时间：
AUG 10-12, 2012
会议地点：
Zhangjiajie, PEOPLES R CHINA
会议主办单位：
[Zou, Ruibiao] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.^[Yi, Wei;Mou, Zouxin] Sany Heavy Ind Co Ltd, Changde 415001, Peoples R China.
摘要：
Two mild alkaline oxidative pretreatments of rice straw followed by enzymatic hydrolysis were investigated. In addition to measuring the composition variance, the pretreated rice straw solutions were analysed by the UV/Vis spectra. These two mild oxidative pretreatment of rice straw cause the removal of lignin, hemicellulose and neutral detergent solubles (NDS), where the H <inf>2</inf>O<inf>2</inf>/NaOH pretreatment solubilize the lignin and the O <inf>3</inf>/NaOH pretreatment oxidative degrade the lignin. These two mild oxidative pretreatment of rice straw enhance susceptibility to enzymatic hydrolysis, and speed-up the enzymatic hydrolysis. The conversion yield of cellulose and hemicellulose presented in the O<inf>3</inf>/NaOH pretreated rice straw was 92.6%, compared to 82.3% and 52.5% in the H<inf>2</inf>O <inf>2</inf>/NaOH pretreated and untreated rice straw, respectively.
关键词：
college physics;agricultural university;explore independently;teaching method;teaching efficiency
摘要：
China is a big agricultural country, and training qualified agricultural talents relates to long-term development of our country. College physics is one of the important foundation courses in agricultural university, but the classroom teaching current faces severe challenges. To improve the efficiency of college physics teaching, we propose to a new type of teaching mode which explored independently by the students themselves. It can change the boring classroom atmosphere, and effectively stimulate students’ learning enthusiasm. So it can improve the teaching efficiency and promote agricultural talent training.
