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Preparation and characterization of lithium λ-MnO2 ion-sieves

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Frontiers of Chemical Science and Engineering 2014年第4期8卷 471-477页

作者： chang WANG Yanlong ZHAI xi WANG Ming ZENG College of Marine Science & Engineering Tianjin University of Science & Technology Tianjin 300457 China College of Material Science & Chemical Engineering Tianjin University of Science & Technology Tia.ajin 300457 China

Abstract Lithium λ-MnO2 ion-sieves were prepared from spinel LiMn2O4 via treatment with nitric acid. The LiMn2O4 was synthesized by a solid state reaction between LiOH· H2O and MnO2. The effects of the calcination time and temperature on the preparation of the LiMn2O4 precursor and the lithium ion-sieve were investigated. In addition, the Li^＋ extraction ratio, the Mn^2＋ dissolving ratio and the adsorption properties of the lithium ion-sieve were all measured. The lithium ion-sieve had a high exchange capacity and was selective for Li^＋. Specifically, at pH = 13, the ion exchange capacity of Li^＋ was 30.9mg/g in 10 mmol/L LiCl solution and the lithium extraction ratio and manganese dissolving ratio were 95% and 25%, respec- tively.

关键词： lithium ion-sieve solid state reaction adsorp-tion LiMn2O4

Zr-doped titanium lithium ion sieve and EP-granulated composite:Superb adsorption and recycling performance

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Particuology 2022年第10期20卷 100-110页

作者： Suyu zhou xiaojing Guo xi Yan Yan Chen Wanzhong Lang The Education Ministry Key Laboratory of Resource Chemistry Shanghai Key Laboratory of Rare Earth Functional MaterialsDepartment of Chemistry and Chemical EngineeringShanghai Normal UniversityShanghai 200234China

Lithium ion sieve(LIS)has attracted great attention due to its high adsorption selectivity towards Li+.Herein,a new type of Zr-doped Ti-LIS(HZrTO)was synthesized by a simple calcination *** adsorption capacity increased from 56.3 mgg-1(before doping)to 93.2 mgg-1 after doping in LiOH solution(lithium 1.8gL-1).The adsorption isotherm and adsorption kinetics of HZrTO accord with the Langmuir isotherm and the pseudo-second-order kinetic equation,*** experiments showed that HZrTO has good stability and *** addition,HZrTO was granulated via epoxy resin(E-12),and the obtained granular adsorbent showed good adsorption capacity,excellent stability and high selectivity towards Li+.

关键词： Lithium ion sieve Lithium titanium oxide Zr-doped Granulation

Flexible Bio-tensegrity Manipulator with Multi-degree of Freedom and Variable Structure

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Chinese Journal of Mechanical Engineering 2020年第1期33卷 83-93页

作者： Dunwen Wei Tao Gao xiaojuan Mo Ruru xi Cong zhou School of Mechanical and Electrical Engineering University of Electronic Science and Technology of ChinaChengdu 611731China School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China

Conventional manipulators with rigid structures and sti ness actuators have poor flexibility,limited obstacle avoidance capability,and constrained *** developed flexible or soft manipulators in recent years have the characteristics of infinite degrees of freedom,high flexibility,environmental adaptability,and extended manipulation ***,these existing manipulators still cannot achieve the shrinking motion and independent control of specified segments like the animals,which hinders their *** this paper,a flexible bio-tensegrity manipulator,inspired by the longitudinal and transversal muscles of octopus tentacles,was proposed to mimic the shrinking behavior and achieve the variable motion patterns of each *** proposed manipulator uses the elastic spring as the backbone,which is driven by four cables and has one variable structure mechanism in each segment to achieve the independent control of each *** variable structure mechanism innovatively contains seven lock-release states to independently control the bending and shrinking motion of each *** the kinematic modeling and analysis,one prototype of such bionic flexible manipulator was built and the open-loop control method was *** proof-of-concept experiments,including the shrinking motion,bending motion,and variable structure motion,were carried out by controlling the length of four cables and changing the lock-release states of the variable structure mechanism,which validate the feasibility and validity of our proposed ***,the experimental results show the flexible manipulator can accomplish the bending and shrinking motion with the relative error less than 6.8%through the simple independent control of each segment using the variable structure *** proposed manipulator has the features of controllable degree-of-freedom in each segment,which extend their environmental adaptability,and manipulation capability.

关键词： Bio-tensegrity Cable-driven actuation Multi-degree-of-freedom(Multi-DoF) Flexible manipulator Variable structure mechanism

Power-to-chemicals:sustainable liquefaction of food waste with plasma-electrolysis

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Frontiers of Chemical Science and Engineering 2023年第5期17卷 594-605页

作者： Wenquan xie xianhui Zhang Dengke xi Rusen zhou Size Yang Patrick Cullen Renwu zhou Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Fujian Engineering Research Center for EDAFujian Provincial Key Laboratory of Electromagnetic Wave Science and Detection TechnologyXiamen Key Laboratory of Multiphysics Electronic InformationInstitute of Electromagnetics and AcousticsXiamen UniversityXiamen 361005China School of Chemical and Biomolecular Engineering University of SydneySydney NSW 2006Australia State Key Laboratory of Electrical Insulation and Power Equipment Centre for Plasma BiomedicineXi’an Jiaotong UniversityXi’an 710049China

The increasing amount of food waste from various industrial,agricultural,and household sources is an environmental burden if managed *** waste management approaches have been developed for the disposal of food waste,but still suffer from either high cost,production of toxic by-products,or secondary environmental ***,we report a new and sustainable plasma electrolysis biorefinery route for the rapid and efficient liquefaction of food *** the plasma electrolysis process,only the solvent is added to liquefy the waste,and anions in the waste can contribute to catalyzing the biowaste *** liquefying the waste,the highly reactive species produced in the plasma electrolysis process can efficiently reduce the content of O,N,and Cl in the liquefied products and oxidize most of the metals into solid ***,the removal rate of Na and K elements was greater than 81%,which is significantly higher than using the traditional oil bath liquefaction,resulting in a relatively high-quality biocrude oil with a high heating value of 25.86 MJ·kg^(-1).Overall,this proposed strategy may provide a new sustainable and eco-friendly avenue for the power-to-chemicals valorization of food waste under benign conditions.

关键词： plasma electrolysis food waste liquefaction resource recovery

Stability of patches of oasis landscape in arid areas:A case study of Sangong River Watershed,xinjiang,China

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Chinese Science Bulletin 2006年第A01期51卷 92-100页

作者： LUO Geping zhou Chenghu CHEN xi xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China Institute of Geographical Science and Resources Research Chinese Academy of Sciences Beijing 100101 China

绿洲的稳定性是在进化的过程和在干旱区域的绿洲的管理的关键科学问题之一。绿洲和它的表示的稳定性在不同规模也是不同的。这篇论文在 Tianshan 山的 Sangong 河分水岭与案例研究在风景补丁规模处理绿洲的稳定性。我们采用了 ther 激... 详细信息

绿洲的稳定性是在进化的过程和在干旱区域的绿洲的管理的关键科学问题之一。绿洲和它的表示的稳定性在不同规模也是不同的。这篇论文在 Tianshan 山的 Sangong 河分水岭与案例研究在风景补丁规模处理绿洲的稳定性。我们采用了 ther 激动地表达感情到进程 ther 的察觉到的、地理信息系统和数学统计方法激动地表达感情在 1978， 1987 和 1998 察觉到三个时期的图象，并且为在风景补丁规模代表绿洲稳定性提出途径。绿洲补丁的风景控制能力是动态风景变化的一种自然驱动力。在有它在它和另外的补丁之间的区域和形状复杂性和对比的风景变化增加以后的某个补丁类型的控制能力，和有它在它和另外的补丁之间的空间距离的还原剂。有最强壮的控制能力的补丁类型应该是风景的矩阵。绿洲风景补丁的变换源于自然、人为的驱动力，特别地人为的驱动力。变换比例越高，越多降低补丁类型的稳定性并且人为的骚乱越更强壮。有在在 1987 的 Sangong 河分水岭的最强壮的网控制能力的补丁类型是荒芜的草地，它是风景的矩阵；但是风景的矩阵在 1987 和 1998 被变成了灌溉陆地。绿洲风景进化上的风景补丁的控制能力逐渐地在程度也逐渐地减少了的 Sangong 河分水岭，和变化与时间减少了。这表明在风景补丁类型之中的相互作用通常通常趋于到还原剂，和绿洲风景补丁的自然稳定性趋于增加。然而，在风景补丁之中的变换由于集中的人的活动的增加更经常发生，它可能在绿洲风景引起环境资源补丁的更低的稳定性和介绍补丁的更高的稳定性。

关键词：稳定性景观保护绿洲 GIS 遥感 NDVI

不同分数阶微分形式在盐渍土电导率高光谱反演中的适用性研究

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光谱学与光谱分析 2025年第1期45卷 272-281页

作者：周凤玺滕祥帅郝君明王立业兰州理工大学土木工程学院甘肃兰州730050 兰州理工大学西部土木工程防灾减灾教育部工程研究中心甘肃兰州730050 兰州理工大学甘肃省应急测绘工程研究中心甘肃兰州730050

近年来,部分学者将分数阶微分理论应用到盐渍土电导率高光谱反演中,取得了较为显著的效果。然而,已有研究多采用Grünwald-Letnikov分数阶微分定义形式,对于Riemann-Liouville、Caputo分数阶微分定义形式的应用研究较少,Riemann-Liouvi... 详细信息

近年来,部分学者将分数阶微分理论应用到盐渍土电导率高光谱反演中,取得了较为显著的效果。然而,已有研究多采用Grünwald-Letnikov分数阶微分定义形式,对于Riemann-Liouville、Caputo分数阶微分定义形式的应用研究较少,Riemann-Liouville、Caputo分数阶微分定义形式在盐渍土电导率高光谱反演中的适用性尚不明确。基于实测土壤电导率和高光谱数据,考虑常见的Grünwald-Letnikov、Riemann-Liouville和Caputo三类分数阶微分定义形式,通过软件编程实现Grünwald-Letnikov、Riemann-Liouville、Caputo分数阶微分处理函数,比较分析了不同分数阶微分定义形式下,土样高光谱数据在同阶微分处理后的差异性以及随阶数增加后的变化特征。结果表明:土样光谱反射率曲线在不同分数阶微分定义形式下,同阶微分处理后表现出较大差异;在0.1~1阶范围内,随微分阶数的增加,Grünwald-Letnikov、Riemann-Liouville、Caputo分数阶微分处理后高度变异波段数量均呈现出增加趋势;当微分阶数趋于1时,光谱反射率微分值逐渐降低且向0值逼近,波动范围逐渐减小,而光谱数据的变异性却随着波动范围的减小而增强;Grünwald-Letnikov分数阶微分处理在0.6、0.7阶相关系数提升9.5%、6.7%,Riemann-Liouville和Caputo分数阶微分处理后,相关系数分别在0.8~0.9阶、0.7~0.9阶提升1%左右。该研究为高光谱数据预处理提供了一种新的研究思路,为更好的将分数阶微分理论应用到土壤盐渍化遥感反演中提供参考。

关键词：盐渍土电导率光谱反射率分数阶微分

Toolpath Interpolation and Smoothing for Computer Numerical Control Machining of Freeform Surfaces: A Review

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International Journal of Automation and computing 2020年第1期17卷 1-16页

作者： Wen-Bin Zhong xi-Chun Luo Wen-Long chang Yu-Kui Cai Fei Ding Hai-Tao Liu Ya-zhou Sun Centre for Precision Manufacturing Department of DesignManufacture&Engineering Management(DMEM)University of StrathclydeGlasgow G11XJUK Engineering and Physical Sciences Research Council(EPSRC)Future Metrology Hub Centre for Precision TechnologiesUniversity of HuddersfieldHuddersfield HD13DHUK School of Mechatronic Engineering Harbin Institute of TechnologyHarbin 150001China

Driven by the ever increasing demand in function integration,more and more next generation high value-added products,such as head-up displays,solar concentrators and intra-ocular-lens,etc.,are designed to possess freeform(i.e.,non-rotational symmetric)*** toolpath,composed of high density of short linear and circular segments,is generally used in computer numerical control(CNC)systems to machine those ***,the discontinuity between toolpath segments leads to high-frequency fluctuation of feedrate and acceleration,which will decrease the machining efficiency and product surface *** by the ever-increasing need for high-speed high-precision machining of those products,many novel toolpath interpolation and smoothing approaches have been proposed in both academia and industry,aiming to alleviate the issues caused by the conventional toolpath representation and interpolation *** paper provides a comprehensive review of the state-of-the-art toolpath interpolation and smoothing approaches with systematic *** advantages and disadvantages of these approaches are *** future research directions are also offered.

关键词： Computer numerical control(CNC) toolpath interpolation smoothing freeform surface

Communication via Chaotic Synchronization Based on Contraction Maps

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Chinese Physics Letters 1996年第8期13卷 572-575页

作者： zhou chang-song CHEN Tian-lun Department of Physics Nankai UniversityTianjin 300071

A newly proposed method for constructing chaotically synchronizing systems is applied to *** independent information signals can be transmitted at the same time if the chaotic system is a multi-dimensional *** of the ... 详细信息

关键词： chaotic constructing method

Ambient Fine Particulate Matter Exposure and Blood Pressure:Evidence from a Large Chinese Multiple Follow-Up Study

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Biomedical and Environmental Sciences 2023年第1期36卷 38-49页

作者： JIANGTULU Bahabaike LAN chang xin CHEN Jun xi CHEN xi WANG Bin XUE Tao Institute of Reproductive and Child Health Key Laboratory of Reproductive HealthNational Health Commission of the People's Republic of ChinaBeijing 100191China Department of Epidemiology and Biostatistics School of Public HealthPeking UniversityBeijing 100191China National Institute of Environmental Health Chinese Center for Disease Control and Prevention(China CDC)Beijing 102206China

Objective This study aimed to investigate the association of ambient PM_(2.5)exposure with blood pressure(BP)at the population level in *** A total of 14,080 participants who had at least two valid blood pressure records were selected from the China Health and Retirement Longitudinal Survey during 2011–*** long-term PM_(2.5)exposure was assessed at the geographical level,on the basis of a regular 0.1°×0.1°grid over China.A mixed-effects regression model was used to assess *** Each decrease of 10μg/m^(3)in the 1 year-mean PM_(2.5)concentration(FPM1Y)was associated with a decrease of 1.24[95%confidence interval(CI):0.84–1.64]mmHg systolic BP(SBP)and 0.50(95%CI:0.25–0.75)mmHg diastolic BP(DBP),respectively.A robust association was observed between the long-term decrease in PM_(2.5)and decreased BP in the middle-aged and older *** a generalized additive mixed model,we further found that SBP increased nonlinearly overall with FPM1Y but in an approximately linear range when the FPM1Y concentration wasximately linearly without a clear *** Efficient control of PM_(2.5)air pollution may promote vascular health in *** study provides robust scientific support for making the related air pollution control policies.

关键词： Fine particulate matter PM_(2.5) Blood pressure Risk assessment Preventive medicine