检索结果-南通市图书馆

维普期刊数据库博看期刊

A Survey of Output Feedback Robust MPC for Linear Parameter Varying Systems

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2022年第10期9卷 1717-1751页

作者： Xubin Ping Jianchen Hu Tingyu Lin baocang Ding Peng wang Zhiwu Li the Department of Automation School of Electro-Mech-anical EngineeringXidian UniversityXi’an 710071China the Ministry of Education Key Laboratory for Intelligent Networks and Network Security School of Automation Science and EngineeringFaculty of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049China the State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System EngineeringBeijing 100854China the College of Automation Chongqing University of Posts and TelecommunicationsChongqing 400065China the Information and Navigation College Air Force Engineering UniversityXi’an 710077China IEEE the School of Electro-Mechanical Engineering Xidian UniversityXi’an 710071 the Institute of System Engineering Macao University of Science and TechnologyMacao SARChina

For constrained linear parameter varying(LPV)systems,this survey comprehensively reviews the literatures on output feedback robust model predictive control(OFRMPC)over the past two decades from the aspects on motivations,main contributions,and the related *** to the types of state observer systems and scheduling parameters of LPV systems,different kinds of OFRMPC approaches are summarized and *** extensions of OFRMPC for LPV systems to other related uncertain systems are also *** methods of dealing with system uncertainties and constraints in different kinds of OFRMPC optimizations are *** issues on OFRMPC optimizations for LPV systems are ***,the future research directions on OFRMPC for LPV systems are suggested.

关键词： Linear parameter varying(LPV)systems model predictive control(MPC) output feedback robust control

Elaborately tuning the electronic structure of single-atom nickel sites using nickel nanoparticles to markedly enhance the electrochemical reduction of nitrate into ammonia

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第8期83卷 32-42,I0003页

作者： Zichao Xi Jiaqian wang baocang Liu Xuan Xu Peng Jing Rui Gao Jun Zhang School of Chemistry and Chemical Engineering&Inner Mongolia Engineering and Technology Research Center for Catalytic Conversion and Utilization of Carbon Resource Molecules Inner Mongolia UniversityHohhot 010020InnerMongoliaChina Inner Mongolia Academy of Science and Technology Hohot 010010Inner MongoliaChina

The electrochemical reduction of nitrate to ammonia(NH3) can be used to recycle nitrogen and offers a decarbonized route for sustainable NH3production,but requires efficient ***,we have rationally designed and fabricated a novel self-supported electrocatalyst comprised of Ni nanoparticles(NiNPs) embedded in Ni single atoms(NiSAs) anchored to nitrogen-doped carbon nanotubes grown on carbon cloth(NiNPs@NiSAs-NCNTs/CC) used for an efficient nitrate reduction reaction(NO3-RR) to produce NH_(3).The electrocatalyst can attain a maximum NH3yield rate of 27.67±1.16 mgNH3h^(-1)cm^(-2)at-1.4 V *** hydrogen electrode(RHE) and nearly 100% Faradic efficiency in the range of-1.2--1.4 V *** in a neutral medium,outperforming the previously reported Ni-based *** experimental analysis and theoretical calculations have demonstrated that the moderate electrondeficient state of NiSAsregulated by NiNPsnot only facilitates the enrichment of NO_(3)^(-),but also benefits the formation of NO3*and decrease in the energy barrier of the rate-limiting step,thus resulting in the enhanced NO3-RR performance.

关键词： Nitratereductionreaction Moderateelectron-deficient state Self-supported electrocatalyst Enrichmentof NO_(3)^(-) Theoreticalcalculations

Steam Pressure Control of 1000 MW Ultra-Supercritical Coal-Fired Power Unit Based on Multi-Model Predictive Control

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2019年第1期24卷 86-93页

作者： wang Guoliang DING baocang YAN Weiwu School of Electronic and Electrical Engineering Shanghai University of Engineering Science School of Electronic and Information Engineering Xi'an Jiaotong University Department of Automation Shanghai Jiao Tong University

Ultra-supercritical(USC) coal-fired unit is more and more popular in these years for its *** the control of USC unit is a difficult issue for its characteristic of nonlinearity, large dead time and coupling among inputs and outputs. In this paper, model predictive control(MPC) method based on multi-model and double layered optimization is introduced for coordinated control of USC unit running in sliding pressure mode and fixed pressure mode. Three inputs(i.e. valve opening, coal flow and feedwater flow) are employed to control three outputs(i.e. output power, main steam temperature and main steam pressure). The step responses for the dynamic matrix control(DMC) are constructed using the three inputs by the three outputs under both pressure control mode. Piecewise models are built at selected operation points. In simulation, the output power follows load demand quickly and main steam temperature can be controlled around the setpoint closely in load tracking control. The simulation results show the effectiveness of the proposed methods.

关键词： ultra-supercritical coordinated control multi-model model predictive control steam pressure control

在线全文

学校读者我要写书评

暂无评论

近红外光谱技术分析茴香秸秆的营养组成

草业科学 2025年第2期42卷 433-442页

作者：李钰李欣荣刘保仓邓晓裕郭涛史艳丽年芳李飞许辉徐国延王新基甘肃农业大学动物科学技术学院甘肃兰州730070 兰州大学草地农业科技学院甘肃兰州730000 阿克苏泰昆饲料有限责任公司新疆阿克苏842008 甘肃农业大学理学院甘肃兰州730070 民勤县德福农业科技有限公司甘肃武威733300 民勤县农业农村局大滩镇畜牧兽医站甘肃武威733399 民勤县畜牧兽医工作站甘肃武威733399

本研究旨在利用近红外光谱技术(NIRS)构建茴香(Foeniculum vulgare)秸秆营养成分预测模型。2022−2023年于甘肃省民勤县采集109份茴香秸秆样品,使用近红外光谱仪扫描样品得到吸光度值,分别测定其干物质(DM)、粗蛋白质(CP)、有机物(OM)、... 详细信息

本研究旨在利用近红外光谱技术(NIRS)构建茴香(Foeniculum vulgare)秸秆营养成分预测模型。2022−2023年于甘肃省民勤县采集109份茴香秸秆样品,使用近红外光谱仪扫描样品得到吸光度值,分别测定其干物质(DM)、粗蛋白质(CP)、有机物(OM)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)、粗脂肪(EE)和粗灰分(Ash)的含量;运用改良偏最小二乘法(MPLS)分别构建各营养成分预测模型并进行外部验证。结果表明:茴香秸秆中DM、CP、OM、NDF、ADF和Ash含量的预测决定系数(RSQ)为0.853~0.951,外部验证相对分析误差(RPD)为2.574~4.239,模型的预测能力良好,可用于实际检测;而EE含量的RSQ和RPD分别为0.806和2.259,定标模型只能用于样品的粗略筛选。

关键词：茴香秸秆非常规饲料近红外光谱技术粗饲料营养成分

金刚石型面约束的自由磨粒挤磨修整超硬磨料砂轮方法

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国机械工程 2020年第24期31卷 2959-2965页

作者：崔仲鸣王星赫青山周宝仓河南工业大学机电工程学院郑州450001

针对超硬磨料砂轮存在修整困难的问题,基于金刚石和普通材料在强度上存在巨大差异的特点,提出了一种在金刚石型面约束下将磨粒挤压和修磨相结合的修整方法,其基本原理是:表面有精密形状的金刚石工具通过高速旋转生成具有约束能力的高强... 详细信息

针对超硬磨料砂轮存在修整困难的问题,基于金刚石和普通材料在强度上存在巨大差异的特点,提出了一种在金刚石型面约束下将磨粒挤压和修磨相结合的修整方法,其基本原理是:表面有精密形状的金刚石工具通过高速旋转生成具有约束能力的高强度型面,型面通过约束自由磨粒对被修砂轮产生挤压划擦作用破坏砂轮结合剂完成砂轮高效修形,同时通过修整工具高强度金刚石磨料的微研削作用对被修砂轮型面进行进一步精密修磨。对约束型面的形成及自由磨粒在型面约束下挤压和研削作用机制进行了分析,并介绍了挤磨修整系统的构成和特性,对修整力、修磨速度和自由磨粒等参数影响规律进行了初步试验探索,结果表明,自由磨粒型面约束下的挤压能够实现超硬磨料砂轮的快速成形精密修整。

关键词：超硬磨料砂轮砂轮修整挤磨修整金刚石约束型面自由磨粒

High energy facets exposure and nitrogen doping of TiO2 nanocubes on graphene via a one-pot ionic liquid assisted hydrothermal etching method for enhanced photocatalysis

在线全文

学校读者我要写书评

暂无评论

High energy facets exposure and nitrogen doping of TiO2 nano...

Functional Nanostructures for Catalytic Application

中国化学会第九届全国无机化学学术会议

作者： Geng Zhang Tuo Zhao Xia Gong Dichao Shi baocang Liu Qin wang Jun Zhang College of Chemistry and Chemical Engineering Inner Mongolia University

Titanium dioxide（TiO2） has been widely investigated for use in degradation of environment pollutants because of its light active property that may utilize the clean energy of sunlight to drive the photocatalysis [1]. However, there are still challenges for TiO2 in utilizing sunlight as driving force for organic pollutant degradation because of its wide bandgap only response to UV light and easy aggregation in form of nanoparticles causing the loss of chemically active sites. In recent years, owing to its super high specific surface area and excellent mobility of charge carriers, graphene has been considered as an appropriate catalyst carrier to enhance the catalytic activity [2]. In our work, we developed a facile ionic liquid assisted hydrothermal etching method to synthesize nitrogen doped TiO2/graphene nanocomposites, in which TiO2 nanocubes standing on graphene were formed and their high energy {001} facets were exposed due to the fluorine contained ionic liquid etching [3]. Simultaneously, the graphene also possesses the nitrogen doping feature as a support. The crystal structure, morphology, and physicochemical property of the obtained nanocomposites were systematically studied. It is revealed that the photocatalysis of the obtained nanocomposites for degradation of organic dyes both under UV and visible radiations were largely enhanced. The acceleration of electron transfer with the assistance of graphene and low recombination rate of electron-hole pairs due to high energy {001} facets exposure account for the enhancement of the photocatalysis. Considering their facile synthesis, particular compositing structure with nitrogen doping and high energy {001} facets exposure of cubic TiO2 and high photoactivity, the nitrogen doped TiO2/graphene nanocomposites can be regard as one of the ideal photocatalyst for various potential applications.

关键词： TiO2 Graphene Ionic liquid Photocatalysis

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Functional Nanostructures for Catalytic Application

第十四届全国青年催化学术会议

作者： Jun Zhang Qin wang baocang Liu Yang Liu Wenting Hu Wenjing Jia Yongxin Liu College of Chemistry and Chemical Engineering Inner Mongolia University

＜正＞Functional nanostructures with desired porous geometry and hierarchical architecture are of significant importance, as the creation of porous and hierarchical structures with macro-and meso-porosity, large surface areas, adjustable skeleton components, and variable supported noble metals, and good structural stability may be greatly beneficial to the improvement of their catalytic property. To this end, we create

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

昆明中铁大厦项目超限高层结构设计

工业建筑 2022年第8期52卷 215-221,186页

作者：王晓东王斌宋宝仓王东方刘明辉中铁建工集团有限公司设计院北京100070 中铁建工集团有限公司建筑工程研究院北京100070 西藏涛扬建筑设计有限公司拉萨850000

昆明中铁大厦项目建筑高度226 m,抗震设防烈度为8度,该结构存在扭转不规则、偏心布置、楼板不连续、斜柱转换等超限问题。为解决上述问题,本项目创造性地采用了“高延性、高耗能”结构体系,并针对上述问题进行了研究,最后进行了罕遇地... 详细信息

昆明中铁大厦项目建筑高度226 m,抗震设防烈度为8度,该结构存在扭转不规则、偏心布置、楼板不连续、斜柱转换等超限问题。为解决上述问题,本项目创造性地采用了“高延性、高耗能”结构体系,并针对上述问题进行了研究,最后进行了罕遇地震和巨震弹塑性分析。结果表明:裙房局部采用密柱、斜撑方式可控制底部扭转位移比;塔楼可拆分成低塔和高塔,分别调整单体的刚心、质心偏心率,线性组装后可保证塔楼整体不扭转;楼板局部不连续对塔楼整体性无影响;斜柱转换相关范围楼板混凝土后浇可控制楼板开裂;塔楼抗扭能力强,偏心荷载对其罕遇地震性能无影响;罕遇地震结构等效阻尼比为11.5%,筒体采用的波纹腹板钢连梁和钢骨混凝土连梁实现了高耗能作用;1.2倍罕遇地震引起塔楼倒塌,外框架作为结构二道防线偏弱,倒塌相关区域剪力墙宜内增设型钢,提高结构的抗倒塌性能。

关键词：高延性高耗能波纹腹板钢连梁钢骨混凝土连梁罕遇地震巨震

在线全文

学校读者我要写书评

暂无评论

近红外光谱技术在反刍动物营养中的应用

草业科学 2024年第3期41卷 739-749页

作者：史艳丽郭涛代露茗王力李飞刘保仓草地农业生态系统国家重点实验室/兰州大学农业农村部草牧业创新重点实验室/兰州大学草地农业科技学院甘肃兰州730020 阿克苏泰昆饲料有限责任公司新疆阿克苏842008

近红外光谱技术以其快速、便捷、无损、绿色等优点,成为动物饲料营养价值评定研究中最具潜力的方法之一。本文简述了近红外光谱技术应用于饲料营养成分含量的测定、饲料的掺假鉴别及定量分析、饲料在瘤胃的降解情况、饲料在动物体内的... 详细信息

近红外光谱技术以其快速、便捷、无损、绿色等优点,成为动物饲料营养价值评定研究中最具潜力的方法之一。本文简述了近红外光谱技术应用于饲料营养成分含量的测定、饲料的掺假鉴别及定量分析、饲料在瘤胃的降解情况、饲料在动物体内的消化代谢情况和反刍动物采食量预测方面的有效性和准确性,并指出了后续应对已有模型进行不断优化。最终得出结论:目前近红外光谱技术结合化学计量学在饲料营养成分含量的测定、掺假鉴别和定量分析方面的准确性和稳定性较高,而对饲料在瘤胃的降解情况、动物体内消化率和采食量的预测方面,其准确性还有待进一步提高。

关键词：饲料营养成分饲料掺假鉴别养分消化率采食量定量分析预测模型模型优化