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Model-based Predictive Control for Spatially-distributed Systems Using Dimensional Reduction Models 被引量:3
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作者 Meng-Ling Wang Ning Li Shao-Yuan Li 《International Journal of Automation and computing》 EI 2011年第1期1-7,共7页
In this paper, a low-dimensional multiple-input and multiple-output (MIMO) model predictive control (MPC) configuration is presented for partial differential equation (PDE) unknown spatially-distributed systems ... In this paper, a low-dimensional multiple-input and multiple-output (MIMO) model predictive control (MPC) configuration is presented for partial differential equation (PDE) unknown spatially-distributed systems (SDSs). First, the dimension reduction with principal component analysis (PCA) is used to transform the high-dimensional spatio-temporal data into a low-dimensional time domain. The MPC strategy is proposed based on the online correction low-dimensional models, where the state of the system at a previous time is used to correct the output of low-dimensional models. Sufficient conditions for closed-loop stability are presented and proven. Simulations demonstrate the accuracy and efficiency of the proposed methodologies. 展开更多
关键词 Spatially-distributed system principal component analysis (PCA) time/space separation dimension reduction model predictive control (MPC).
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Controlled Growth of One-Dimensional Oxide Nanomaterials 被引量:8
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作者 Xiaosheng FANG Lide ZHANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2006年第1期1-18,共18页
This article reviews the recent developments in the controlled growth of one-dimensional (1D) oxide nanomaterials, including ZnO, SnO2, In203, Ga203, SiOx, MgO, and Al203. The growth of 2D oxide nanomaterials was ca... This article reviews the recent developments in the controlled growth of one-dimensional (1D) oxide nanomaterials, including ZnO, SnO2, In203, Ga203, SiOx, MgO, and Al203. The growth of 2D oxide nanomaterials was carried out in a simple chemical vapor transport and condensation system. This article will begin with a survey of nanotechnology and 1D nanomaterials achieved by many researchers, and then mainly discuss on the controlled growth of ID oxide nanomaterials with their morphologies, sizes, compositions, and microstructures controlled by altering experimental parameters, such as the temperature at the source material and the substrate, temperature gradient in the tube furnace, the total reaction time, the heating rate of the furnace, the gas flow rate, and the starting material. Their roles in the formation of various morphologies are analyzed and discussed. Finally, this review will be concluded with personal perspectives on the future research directions of this area. 展开更多
关键词 controlled growth ONE-dimensionAL OXIDE NANOMATERIALS
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Analysis of one dimensional and two dimensional fuzzy controllers
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作者 Ban Xiaojun Gao Xiaozhi +1 位作者 Huang Xianlin Wu Tianbao 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2006年第2期362-373,共12页
The analytical structures and the corresponding mathematical properties of the one dimensional and two dimensional fuzzy controllers are first investigated in detail. The nature of these two kinds of fuzzy controllers... The analytical structures and the corresponding mathematical properties of the one dimensional and two dimensional fuzzy controllers are first investigated in detail. The nature of these two kinds of fuzzy controllers is next probed from the perspective of control engineering. For the one dimensional fuzzy controller, it is concluded that this controller is a combination of a saturation element and a nonlinear proportional controller, and the system that employs the one dimensional fuzzy controller is the combination of an open-loop control system and a closedloop control system. For the latter case, it is concluded that it is a hybrid controller, which comprises the saturation part, zero-output part, nonlinear derivative part, nonlinear proportional part, as well as nonlinear proportional-derivative part, and the two dimensional fuzzy controller-based control system is a loop-varying system with varying number of control loops. 展开更多
关键词 one dimensional fuzzy controller two dimensional fuzzy controller analytical structures fuzzy inference control system analysis.
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Event-triggered robust guaranteed cost control for two-dimensional nonlinear discrete-time systems 被引量:2
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作者 WANG Sen BU Xuhui LIANG Jiaqi 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2019年第6期1243-1251,共9页
An event-triggered scheme is proposed to solve the problems of robust guaranteed cost control for a class of two-dimensional(2-D)discrete-time systems.Firstly,an eventtriggered scheme is proposed for 2-D discrete-time... An event-triggered scheme is proposed to solve the problems of robust guaranteed cost control for a class of two-dimensional(2-D)discrete-time systems.Firstly,an eventtriggered scheme is proposed for 2-D discrete-time systems with parameter uncertainties and sector nonlinearities.Then,according to the Lyapunov functional method,the sufficient conditions for the existence of event-triggered robust guaranteed cost controller for 2-D discrete-time systems with parameter uncertainties and sector nonlinearities are given.Furthermore,based on the sufficient conditions and the linear matrix inequality(LMI)technique,the problem of designing event-triggered robust guaranteed cost controller is transformed into a feasible solution problem of LMI.Finally,a numerical example is given to demonstrate that,under the proposed event-triggered robust guaranteed cost control,the closed-loop system is asymptotically stable and fewer communication resources are occupied. 展开更多
关键词 event-triggered robust guaranteed cost control two dimensional(2-D)nonlinear system networked control system.
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Morphology-Controlled Growth of A1N One-Dimensional Nanostructures 被引量:1
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作者 Ting XIE Min YE +5 位作者 Xiaosheng FANG Zhi JIANG Li CHEN Mingguang KONG Yucheng WU Lide ZHANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第4期608-614,共7页
Aluminum nitride (AIN) nanowires, serrated nanoribbons, and nanoribbons were selectively obtained through a simple chloride assisted chemical vapor deposition process. The morphologies of the products could be contr... Aluminum nitride (AIN) nanowires, serrated nanoribbons, and nanoribbons were selectively obtained through a simple chloride assisted chemical vapor deposition process. The morphologies of the products could be controlled by adjusting the deposition position and the flux of the reactant gas. The morphologies and structures of the AIN products were investigated in detail. The formation mechanism of the as-prepared different morphologies of AIN one-dimensional (ID) nanostructures was discussed on the basis of the experimental results. 展开更多
关键词 Aluminum nitride Morphology-controlled growth One-dimensional nanostructure
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Controlled teleportation of high-dimension quantumstates with generalized Bell-state measurement 被引量:2
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作者 詹佑邦 《Chinese Physics B》 SCIE EI CAS CSCD 2007年第9期2557-2562,共6页
In this paper a scheme for controlled teleportation of arbitrary high-dimensional unknown quantum states is proposed by using the generalized Bell-basis measurement and the generalized Hadamard transformation. As two ... In this paper a scheme for controlled teleportation of arbitrary high-dimensional unknown quantum states is proposed by using the generalized Bell-basis measurement and the generalized Hadamard transformation. As two special cases, two schemes of controlled teleportation of an unknown single-qutrit state and an unknown two-qutrit state are investigated in detail. In the first scheme, a maximally entangled three-qutrit state is used as the quantum channel, while in the second scheme, an entangled two-qutrit state and an entangled three-qutrit state are employed as the quantum channels. In these schemes, an unknown qutrit state can be teleported to either one of two receivers, but only one of them can reconstruct the qutrit state with the help of the other. Based on the case of qutrits, a scheme of controlled teleportation of an unknown qudit state is presented. 展开更多
关键词 controlled teleportation high-dimensional quantum state generalized Bell-basis measurement generalized Hadamard transformation
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Design of Discrete-time Repetitive Control System Based on Two-dimensional Model 被引量:1
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作者 Song-Gui Yuan Min Wu +1 位作者 Bao-Gang Xu Rui-Juan Liu 《International Journal of Automation and computing》 EI 2012年第2期165-170,共6页
This paper presents a novel design method for discrete-time repetitive control systems (RCS) based on two-dimensional (2D) discrete-time model. Firstly, the 2D model of an RCS is established by considering both th... This paper presents a novel design method for discrete-time repetitive control systems (RCS) based on two-dimensional (2D) discrete-time model. Firstly, the 2D model of an RCS is established by considering both the control action and the learning action in RCS. Then, through constructing a 2D state feedback controller, the design problem of the RCS is converted to the design problem of a 2D system. Then, using 2D system theory and linear matrix inequality (LMI) method, stability criterion is derived for the system without and with uncertainties, respectively. Parameters of the system can be determined by solving the LMI of the stability criterion. Finally, numerical simulations validate the effectiveness of the proposed method. 展开更多
关键词 Linear systems learning control discrete-time repetitive control two-dimensional (2D) systems linear matrix inequality.
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CONTROL OF TWO DIMENSIONAL JETS USING MINIATURE ZERO MASS FLUX JETS 被引量:2
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作者 李勇 明晓 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2000年第3期167-171,共5页
Zero mass flux jets, synthesized by acoustic actuators, have been used for the purpose of jet mixing enhancement and jet vectoring. Zero mass flux jets composed of entirely entrained fluid allow momentum transfer into... Zero mass flux jets, synthesized by acoustic actuators, have been used for the purpose of jet mixing enhancement and jet vectoring. Zero mass flux jets composed of entirely entrained fluid allow momentum transfer into the embedding flow. In the present experiments, miniature scale high aspect ratio actuator jets are placed along the long sides and near the exit plane of a primary two dimensional jet. In different modes, the primary jet can be vectored either towards or away from the actuator jets and the jet mixing is enhanced. The disturbance of the excitation frequency is developed while the unstable frequency of the primary jet is completely suppressed. 展开更多
关键词 two dimensional jets zero mass flux jets flow control
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Application of Sturm Theorem in the Global Controllability of a Class of High Dimensional Polynomial Systems
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作者 XU Xueli LI Qianqian SUN Yimin 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2015年第5期1049-1057,共9页
In this paper, the global controllability for a class of high dimensional polynomial systems has been investigated and a constructive algebraic criterion algorithm for their global controllability has been obtained. B... In this paper, the global controllability for a class of high dimensional polynomial systems has been investigated and a constructive algebraic criterion algorithm for their global controllability has been obtained. By the criterion algorithm, the global controllability can be determined in finite steps of arithmetic operations. The algorithm is imposed on the coefficients of the polynomials only and the analysis technique is based on Sturm Theorem in real algebraic geometry and its modern progress. Finally, the authors will give some examples to show the application of our results. 展开更多
关键词 Global controllability high dimensional systems number of sign variations polynomial Sturm theorem.
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Three-Dimensional Nonlinear Dynamic Model and Macro Control of Real Estate
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作者 Dan Ma Shengwu Zhou Haojin Lv 《Intelligent Information Management》 2010年第5期325-328,共4页
In this paper, according to economics of real estate and macro-control theory, combine with the characteristics of the real estate market, macro-control of the real estate market is studied. After giving the dynamic m... In this paper, according to economics of real estate and macro-control theory, combine with the characteristics of the real estate market, macro-control of the real estate market is studied. After giving the dynamic model of three-dimensional nonlinear differential equations based on the total number of houses on the real estate business, the government’s averages housing investment funds and the standard price, systematically established the stability conditions of equilibrium point for this model. What’s more, through the use of extreme value analysis model, government funds have been invested in real estate business building devotion principles and the construction base of the real estate businessmen has also been estimated successfully. This provides the corresponding theoretical basis for government macro control policy-making. 展开更多
关键词 REAL ESTATE MACRO control THREE-dimensionAL Dynamic Model EXTREME Value Analysis
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Controlled remote implementation of quantum operations with high-dimensional systems 被引量:1
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作者 詹佑邦 李晓薇 +1 位作者 马鹏程 施锦 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第4期118-123,共6页
We present two protocols for the controlled remote implementation of quantum operations between three-party high-dimensional systems. Firstly, the controlled teleportation of an arbitrary unitary operation by bidirect... We present two protocols for the controlled remote implementation of quantum operations between three-party high-dimensional systems. Firstly, the controlled teleportation of an arbitrary unitary operation by bidirectional quantum state teleportaion (BQST) with high-dimensional systems is considered. Then, instead of using the BQST method, a protocol for controlled remote implementation of partially unknown operations belonging to some restricted sets in high-dimensional systems is proposed. It is shown that, in these protocols, if and only if the controller would like to help the sender with the remote operations, the controlled remote implementation of quantum operations for high-dimensional systems can be completed. 展开更多
关键词 controlled remote implementation quantum operation TELEPORTATION high-dimensional entangled state
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基于RPC的同相供电系统供电运行能量多维控制研究
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作者 崔晓 熊宇 +1 位作者 柳贵东 曾贵娥 《电源学报》 CSCD 北大核心 2024年第5期213-219,共7页
为确保高速铁路安全、可靠、经济运行,提出高速铁路同相供电系统供电运行能量多维控制方法。分析供电系统组成结构与供电过程,利用潮流控制器补偿该系统功率,确保系统稳定运行;结合三相不平衡程度、电压电流波形畸变等指标构建运行能量... 为确保高速铁路安全、可靠、经济运行,提出高速铁路同相供电系统供电运行能量多维控制方法。分析供电系统组成结构与供电过程,利用潮流控制器补偿该系统功率,确保系统稳定运行;结合三相不平衡程度、电压电流波形畸变等指标构建运行能量的最佳负载模型,使传输能量损失降到最低;经过对2个供电臂电流的有功与无功补偿,消除负序电流;制定铁路功率调节器控制策略,获得降压变压器变化情况,保障直流侧电压稳定;再使用比例积分控制器获取电流理想值,得出控制信号,实现供电运行能量多维控制。仿真实验证明,所提多维控制方法能提高三相电流平衡程度,达到均压稳定效果。 展开更多
关键词 高速铁路 同相供电系统 运行能量 多维控制 铁路功率调节器
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Stability analysis and control synthesis of uncertain Roesser-type discrete-time two-dimensional systems
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作者 王佳 会国涛 解相朋 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第3期79-84,共6页
We study the stability analysis and control synthesis of uncertain discrete-time two-dimensional(2D) systems.The mathematical model of the discrete-time 2D system is established upon the well-known Roesser model,and... We study the stability analysis and control synthesis of uncertain discrete-time two-dimensional(2D) systems.The mathematical model of the discrete-time 2D system is established upon the well-known Roesser model,and the uncertainty phenomenon,which appears typically in practical environments,is modeled by a convex bounded(polytope type) uncertain domain.The stability analysis and control synthesis of uncertain discrete-time 2D systems are then developed by applying the Lyapunov stability theory.In the processes of stability analysis and control synthesis,the obtained stability/stabilzaition conditions become less conservative by applying some novel relaxed techniques.Moreover,the obtained results are formulated in the form of linear matrix inequalities,which can be easily solved via standard numerical software.Finally,numerical examples are given to demonstrate the effectiveness of the obtained results. 展开更多
关键词 uncertain two-dimensional systems Roesser model Lyapunov stability theory control synthesis
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桩端岩溶三维超声成像方法及应用研究
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作者 孙红林 张邦 +4 位作者 刘铁华 刘铁 化希瑞 陈健 汪文刚 《铁道工程学报》 EI CSCD 北大核心 2024年第2期26-32,37,共8页
研究目的:岩溶地区大直径桩基础受桩端岩溶的威胁大,探查不清或处理不当时可能会出现桩基承载力不足等严重工程质量问题,现有探测方法难以在桩底复杂泥水环境下实现桩端三维精细化探测。本文基于超声相控阵全聚焦成像原理,提出一种全新... 研究目的:岩溶地区大直径桩基础受桩端岩溶的威胁大,探查不清或处理不当时可能会出现桩基承载力不足等严重工程质量问题,现有探测方法难以在桩底复杂泥水环境下实现桩端三维精细化探测。本文基于超声相控阵全聚焦成像原理,提出一种全新的桩端岩溶三维探测方法,以实现对桩端一定范围内地质结构进行三维高精度成像。研究结论:(1)本方法和装备在桩底采集超声数据并成像,可对桩端一定深度和冲切角范围内岩溶三维高精度成像;(2)足尺模型试验表明本装备可探测桩端10 m以内溶洞且探测精度优于0.1 m;(3)工程实践表明本装备可有效查明桩端岩溶、破碎裂隙,探测结果准确可靠;(4)本装备能适应桩底各种恶劣的环境,探测过程简单高效,时效性强,对保障岩溶区桩基施工安全与质量控制具有重要的意义。 展开更多
关键词 大直径桩 岩溶探测 超声相控 三维成像 高精度
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基于C++的三维闪电回击数据再处理系统设计 被引量:4
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作者 李力 蓝天飞 +1 位作者 郭越凡 甘少明 《湖北大学学报(自然科学版)》 CAS 2024年第2期289-296,共8页
针对三维闪电数据处理算法改进之后需重新定位回击数据,以及省级三维闪电探测系统的回击数据通常更加完整,应用时要将多个省份闪电回击数据合并后重新处理出准确的云内闪电高度值等问题,本研究使用C/S架构和C++builder编程开发了三维闪... 针对三维闪电数据处理算法改进之后需重新定位回击数据,以及省级三维闪电探测系统的回击数据通常更加完整,应用时要将多个省份闪电回击数据合并后重新处理出准确的云内闪电高度值等问题,本研究使用C/S架构和C++builder编程开发了三维闪电回击数据再处理系统。系统设计了回击数据查询处理界面,提供了监视控制功能。通过设定回击数据文件和配置文件,再运行软件系统对符合条件的回击数据进行排序,在完成排序的数据中提取同一闪电相关信息,经计算处理得到重新定位的三维闪电探测结果并存储。将系统部署于国家级平台查询处理全国组网的三维闪电历史回击数据,测试结果表明,再处理系统操作便捷、功能齐全,满足三维闪电回击数据再处理系统的任务要求。 展开更多
关键词 三维定位 回击数据 再处理系统 监视控制 入库存储
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多源数据融合的深埋隧道岩爆预测方法
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作者 张平 任松 +2 位作者 吴斐 刘跃 陈星宇 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第3期707-716,共10页
为提高隧道设计阶段未开挖区域的岩爆预测准确性,提出了一种多源数据融合的隧道岩爆预测方法.综合隧道勘察和施工阶段的不同地质信息,采用基于证据关联系数的加权融合技术,构建了隧道精细化三维动态地质模型.建立了基于强度理论的岩爆... 为提高隧道设计阶段未开挖区域的岩爆预测准确性,提出了一种多源数据融合的隧道岩爆预测方法.综合隧道勘察和施工阶段的不同地质信息,采用基于证据关联系数的加权融合技术,构建了隧道精细化三维动态地质模型.建立了基于强度理论的岩爆可能性判定方法和基于能量理论的岩爆烈度预测方法,通过Hoek-Brown强度准则判断围岩是否发生岩爆,利用储能极限阈值和能量释放指数划分岩爆烈度,并将其应用于四川某隧道工程中.结果表明,所提方法可以实现隧道掌子面前方30 m范围内的岩爆精准预测,预测结果与隧道开挖实际岩爆的吻合率为95.8%.因此,该预测方法能够在隧道施工前预判岩爆烈度,为隧道岩爆防治提供指导. 展开更多
关键词 隧道 地质信息 多源融合 三维地质模型 双控理论 岩爆预测
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三门峡水库控制运用方式的优化探讨
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作者 郭彦 侯素珍 +3 位作者 杨飞 王平 胡恬 赖瑞勋 《水电能源科学》 北大核心 2024年第7期202-206,39,共6页
三门峡水库“蓄清排浑”运用为多沙河流的治理提供了宝贵经验,随着来水来沙情况的变化及对水库功能需求和对水库泥沙冲淤规律认识的深化,该运行方式亦在实践中不断调整和完善。为此,针对不同的典型年份设定集中敞泄与分段敞泄的敞泄排... 三门峡水库“蓄清排浑”运用为多沙河流的治理提供了宝贵经验,随着来水来沙情况的变化及对水库功能需求和对水库泥沙冲淤规律认识的深化,该运行方式亦在实践中不断调整和完善。为此,针对不同的典型年份设定集中敞泄与分段敞泄的敞泄排沙方案,采用一维非恒定水沙数学模型,对选取的2018~2019年丰水少沙年和2014~2016年枯水少沙年设定12种控制运用方案进行模拟,比较各方案下库区冲淤变化的优劣,据此选取适合三门峡水库的控制运用方式。结果表明,2018~2019年分段敞泄方案的冲刷效果优于集中敞泄方案,即使在后汛期的控制水位抬高至310 m,也能达到较好的冲刷效果;2014~2016年分段敞泄方案虽优于集中敞泄方案,但其冲刷主要集中于2014年汛期,2015、2016年整体呈淤积状态,综合考虑建议枯水少沙年份水库采用“泥沙年际调节”运用模式。 展开更多
关键词 一维水沙模型 控制运用方式 敞泄排沙 冲淤变化 三门峡水库
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地下煤火分维—分级探测预警技术研究
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作者 孔彪 郑永超 +4 位作者 胡相明 陆伟 张斌 赵旭帅 谢华东 《安全》 2024年第10期26-32,共7页
为实现煤自燃隐蔽火源的高效监测预警和防治,本文对地下煤火分维—分级探测预警技术展开研究。首先,揭示煤自燃受热升温及燃烧过程的煤自燃的电磁—声波—温—气变化特征,形成电磁—声波—氡气—红外多维探测方法,实现井上井下联合多维... 为实现煤自燃隐蔽火源的高效监测预警和防治,本文对地下煤火分维—分级探测预警技术展开研究。首先,揭示煤自燃受热升温及燃烧过程的煤自燃的电磁—声波—温—气变化特征,形成电磁—声波—氡气—红外多维探测方法,实现井上井下联合多维探测应用;其次,根据大尺寸煤自燃指标气体产生规律,建立基于正压输运的煤自燃监测预警体系,实现地下煤自燃发火的分级精准预警;最后,依据复杂区域综放面煤层自燃发火特点、影响因素及变化规律,提出复杂开采煤自燃灾害综合防治技术体系。研究成果可为井下煤自燃灾害预警防治提供依据与参考。 展开更多
关键词 煤自燃 电磁 声波 分维—分级 防治体系
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基于无人机PPK技术在免像控条件下山区光伏地形图的生产
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作者 黄小兵 牛仁义 +5 位作者 王炫懿 程万君 杨健 张社轩 赵三星 刘宇 《北京测绘》 2024年第6期846-850,共5页
针对光伏场区高差大、部分区域植被覆盖、通信信号弱的特点,本文提出了一种基于动态后处理技术(PPK)在免像控条件下航测光伏地形图生产的方法。该方法首先在免像控的条件下对航测获取的无人机影像定位测姿系统(POS)数据和点云数据进行PP... 针对光伏场区高差大、部分区域植被覆盖、通信信号弱的特点,本文提出了一种基于动态后处理技术(PPK)在免像控条件下航测光伏地形图生产的方法。该方法首先在免像控的条件下对航测获取的无人机影像定位测姿系统(POS)数据和点云数据进行PPK解算;然后利用点云后处理、影像空中三角测量、数字微分纠正等技术生成高精度数字高程模型(DEM)和数字正射影像(DOM)成果;最后利用DEM和DOM成果构建三维模型,实现地形图生产。利用两个典型应用实例,验证了该方法可完全满足光伏地形图的精度要求。 展开更多
关键词 光伏地形图 后处理运动学定位技术 三维模型 免像控
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一种三维混沌系统的混沌同步研究
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作者 龙丹 陈长宇 《海军工程大学学报》 CAS 北大核心 2024年第3期103-107,共5页
混沌同步在保密通信领域有着广阔的应用前景,但要实现混沌保密通信,位于接收端和发送端的两个混沌系统必须达到混沌同步。为此,采用简单的线性反馈控制实现了一个新三维混沌系统的混沌同步控制,并应用Lyapunov稳定性理论,证明了两个混... 混沌同步在保密通信领域有着广阔的应用前景,但要实现混沌保密通信,位于接收端和发送端的两个混沌系统必须达到混沌同步。为此,采用简单的线性反馈控制实现了一个新三维混沌系统的混沌同步控制,并应用Lyapunov稳定性理论,证明了两个混沌系统在线性反馈控制下实现混沌同步的条件。根据这些同步条件,只要给定系统参数值,就能够判断两个混沌系统是否能够达到混沌同步;另一方面,也可以根据这些判据来选取实现混沌同步的系统参数。最后,进行了计算机仿真,验证了所得到的同步条件是有效的。 展开更多
关键词 混沌系统 混沌同步控制 线性反馈控制
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