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双金属钕镍有机框架化合物的制备及其电化学性能

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电镀与涂饰 2024年第5期43卷 56-64页

作者：谢欢田飞鄢波罗恩红任俊鹏周进康贵州师范学院化学与材料学院贵州贵阳550018

[目的]稀土元素掺杂及双金属离子配位的金属有机框架化合物(MOFs)具有良好的电化学性能。[方法]以Nd、Ni元素为双金属离子源,均苯三甲酸(BTC)为有机配体,采用溶剂热法制备了具有棱柱状结构的双金属有机框架复合物材料(Nd Ni-MOFs)。采... 详细信息

[目的]稀土元素掺杂及双金属离子配位的金属有机框架化合物(MOFs)具有良好的电化学性能。[方法]以Nd、Ni元素为双金属离子源,均苯三甲酸(BTC)为有机配体,采用溶剂热法制备了具有棱柱状结构的双金属有机框架复合物材料(Nd Ni-MOFs)。采用循环伏安(CV)、恒电流充放电(GCD)和电化学阻抗谱(EIS)考察了Nd Ni-MOFs的电化学性能。[结果]NdNi-MOFs电极在1 A/g电流密度下的比电容可达1 280 F/g,而在8 A/g电流密度下循环充放电5 000次后的比电容为1 145 F/g,电容保持率达88.3%。由Nd Ni-MOFs电极组成的对称电容器在功率密度204.2 W/kg下的能量密度达到175 W·h/kg,充放电循环稳定性良好。[结论]Nd Ni-MOFs有望用作电容器、电池等的电极材料。

关键词：双金属有机框架化合物钕镍电化学电容器循环稳定性

锰铝钴三元水滑石电极材料的制备及其电化学性能研究

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化工技术与开发 2024年第8期53卷 14-18,89页

作者：张思杰任俊鹏鄢波周进康贵州师范学院化学与材料学院贵州贵阳550018

以硝酸锰、硝酸铝、硝酸钴为原料,尿素为沉淀剂,采用水热合成法制备了锰铝钴三元水滑石(MnAlCo-LDHs)复合材料。采用X射线衍射(XRD)、电子扫描电镜(SEM)、X射线光电子能谱(XPS)及比表面孔径分析(BET)等方法,对产物的结构进行了表征,采... 详细信息

以硝酸锰、硝酸铝、硝酸钴为原料,尿素为沉淀剂,采用水热合成法制备了锰铝钴三元水滑石(MnAlCo-LDHs)复合材料。采用X射线衍射(XRD)、电子扫描电镜(SEM)、X射线光电子能谱(XPS)及比表面孔径分析(BET)等方法,对产物的结构进行了表征,采用循环伏安(CV)、恒电流充放电(GCD)、交流阻抗(EIS)等方法测定了材料的电化学性能,考察了钴元素掺杂对材料的电化学性能的影响。结果表明,引入Co元素获得的MnAlCo-LDHs,具有更优异的电化学性能,在1A·g^(-1)的电流密度下,比电容达到1270F·g^(-1),且充放电的循环稳定性良好。

关键词：水滑石锰铝钴电极材料电化学性能

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水稻秸秆制纤维素多孔生物膜的吸附性能研究

山东化工 2024年第6期53卷 72-74,78页

作者：任骥麟张世江任俊鹏王毓杨祺祺陈松黎婷婷贵州师范学院化学与材料学院贵州贵阳510018

通过氢氧化钠-亚氯酸钠法从水稻秸秆中提取纤维素,以水稻秸秆中的纤维素为原料,采用溶解再生-模板法制备出纤维素多孔膜,测试纤维素多孔膜的吸附能力,确保多孔生物基材料的基底,同时对制备的生物基多孔材料官能团组成(FT-IR)、形貌结构(... 详细信息

通过氢氧化钠-亚氯酸钠法从水稻秸秆中提取纤维素,以水稻秸秆中的纤维素为原料,采用溶解再生-模板法制备出纤维素多孔膜,测试纤维素多孔膜的吸附能力,确保多孔生物基材料的基底,同时对制备的生物基多孔材料官能团组成(FT-IR)、形貌结构(SEM)等进行表征,并对纤维素多孔膜材料进行金属离子宏吸附量的测定。与原始水稻秸秆材料相比,其性能具有明显提高,在处理重金属污染时表现出良好的吸附性,因此,水稻秸秆纤维素多孔膜作为天然吸附剂,在吸附方面具有很大的应用潜力,为制备快速止血-抑菌的生物基新型止血材料提供理论依据。所制备出的纤维素多孔膜对于Cu^(2+)离子的吸附率峰值达到74.6%,相比于原始水稻秸秆高出19.3%,在温度为55℃,pH值为7~8之间,吸附效率最好。

关键词：水稻秸秆快速吸附表面改性多孔材料

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A FAS approach for stabilization of generalized chained forms: part 1. Discontinuous control laws

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Science China(Information Sciences) 2024年第2期67卷 118-143页

作者： Guang-ren DUAN Center for Control Theory and Guidance Technology Harbin Institute of Technology Center for Control Science and Technology Southern University of Science and Technology

In this paper, a type of general nonholonomic systems is proposed, which contains both the Brockett’s two example systems, and their extended n-dimensional chained forms, as special cases. For the stabilization of such systems, a stabilizing controller is proposed based on the fully actuated system(FAS)approach, which is discontinuous at the origin but time-invariant when the open-loop system is time-invariant,and drives the feasible trajectories of the system to the origin exponentially. Furthermore, the proposed FAS approach is also extended to the sub-normal system case and the time-delay system case.

关键词： nonholonomic systems feedback stabilization exponential convergence sub-fully actuated systems time-delay systems

A FAS approach for stabilization of generalized chained forms: part 2. Continuous control laws

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Science China(Information Sciences) 2024年第3期67卷 114-135页

作者： Guang-ren DUAN Center for Control Theory and Guidance Technology Harbin Institute of Technology Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and Technology

In this paper, continuous time-varying stabilizing controllers for the type of general nonholonomic systems proposed and treated in part 1 are designed using the fully actuated system(FAS) approach. The key step is to differentiate the first scalar equation, and by control of the obtained second-order scalar system, a proportional plus integral feedback form for the first control variable is obtained. With the solution to this designed second-order scalar system, the rest equations in the nonholonomic system form an independent time-varying subsystem which is then handled by the FAS approach. The overall designed controller contains an almost arbitrarily chosen design parameter, and is proven to guarantee the uniformly and globally exponential stability of the closed-loop system. The proposed approach is simple and effective,and is demonstrated with a practical example of ship control.

关键词： nonholonomic systems feedback stabilization fully actuated systems Lyapunov stability continuous controllers

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正丁烷高温着火延迟期的实验与数值模拟研究

安全、健康和环境 2023年第10期23卷 49-54页

作者：任君朋化学品安全全国重点实验室山东青岛266104 中石化安全工程研究院有限公司山东青岛266104

由于正丁烷高温转化制顺酐工艺涉及高温高压等操作条件,量化正丁烷反应混合气在反应器中的安全停留时间,是保证其安全转化的前提。通过自主建设的高温高压燃爆测试平台,测定了正丁烷在不同温度、压力下的着火延迟时间。研究发现,温度与... 详细信息

由于正丁烷高温转化制顺酐工艺涉及高温高压等操作条件,量化正丁烷反应混合气在反应器中的安全停留时间,是保证其安全转化的前提。通过自主建设的高温高压燃爆测试平台,测定了正丁烷在不同温度、压力下的着火延迟时间。研究发现,温度与压力越高,着火延迟时间越短。更值得注意的是,正丁烷在500~618℃温度范围内,温度越高,着火延迟时间越长,且具有明显负温度效应现象。通过CHEMKIN软件对正丁烷燃烧反应路径进行分析,发现正丁烷出现负温度效应的原因是由于产生的丁基过氧自由基导致低温链支化,抑制了主链反应路径的发展。研究结果有助于深入理解正丁烷自燃机理,指导正丁烷高温转化工艺的安全设计与爆炸防控。

关键词：正丁烷着火延迟时间快压机数值模拟自燃

Research Progress on the Development of Modern Agricultural Science and Technology Park

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Asian Agricultural Research 2019年第9期11卷 79-81,84页

作者： Weizhong LIU Zhijuan WANG junpeng ren Zhenjiang Institute of Agricultural Sciences in Hilly Area of Jiangsu Province Jurong 212400China Zhenjiang Wanshan Hongbian Agricultural Park Jurong 212400China

This paper summarizes the typical models,construction theory and development status of modern agricultural science and technology parks at home and abroad,in order to provide a reference for the sustainable development of modern agricultural science and technology parks in *** is found that at present,the agricultural science and technology park in China is in the stage of quantitative development,neglecting the qualitative construction of the *** paper points out that the balanced relationship among ecology,economy and society should be adjusted to promote the sustainable development of the park.

关键词： Modern agricultural science and technology park Development status Research progress

Resilient control of flexible hypersonic vehicles against unmatched distributed faults

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Chinese Journal of Aeronautics 2024年第5期37卷 60-70页

作者： Dong ZHAO Wenjing ren School of Artificial Intelligence Anhui UniversityHefei 230601China Key Laboratory of System Control and Information Processing Ministry of EducationShanghai Jiao Tong UniversityShanghai 200240China School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China

This paper studies a robust fault compensation and vibration suppression problem of flexible hypersonic *** controlled plant is represented by a cascade system composed of a nonlinear Ordinary Differential Equation(ODE)and an Euler-Bernoulli Beam Equation(EBBE),in which the vibration dynamics is coupled with the rigid dynamics and suffers from distributed faults.A state differential transformation is introduced to transfer distributed faults to an EBBE boundary and a longitudinal dynamics is refined by utilizing T-S fuzzy IF-THEN rules.A novel T-S fuzzy based fault-tolerant control algorithm is developed and related stability conditions are *** robust exponential stability and well-posedness are proved by using the modified l_(0)-semigroup based Lyapunov direct approach.A simulation study on the longitudinal dynamics of flexible hypersonic vehicles effectively verifies the validity of the developed theoretical results.

关键词： Flexible hypersonic vehicles ODE-EBBE cascade Robust exponential stability Unmatched distributed fault compensation Vibration suppression

Global Solvability for a Predator-Prey Model with Prey-Taxis and Rotational Flux Terms

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Chinese Annals of Mathematics,Series B 2024年第2期45卷 297-318页

作者： Guoqiang ren Bin LIU School of Mathematics and Statistics Huazhong University of Science and Technology Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong Universityof Science and Technology

In this paper the author investigates the following predator-prey model with prey-taxis and rotational?ux terms■in a bounded domain with smooth *** presents the global existence of generalized solutions to the model... 详细信息

关键词： Predator-prey Prey-taxis Giopal existence Kotational flnux