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Multiscale observation in wide-spatial radar surveillance based on coherent FDA design

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Science China(Information Sciences) 2024年第2期67卷 232-252页

作者： lei YU Feng HE Yi SU College of Electronics Science National University of Defense Technology

Wide-spatial radar surveillance missions are challenging tasks, requiring an increased power budget and agility in transmission aimed at extracting information from multiple targets in different environments. These requirements necessitate high transmitting degrees of freedom(DOF) to achieve the objective of multiscale observation for specific tasks in specialized regions of interest. Herein, we exploit the multiscale observation ability in wide-spatial radar surveillance based on frequency diverse array(FDA)radar. The proposed method facilitates spatial anisotropic control of multiple radar resources, including the transmitting waveforms, beampattern, and bandwidth. By utilizing a coherent FDA radar, we offer principles for the selection of baseband waveforms, in addition to the quantitative design of the beampattern gain and optimal bandwidth from the perspective of detection. The feasibility of the proposed method is validated through numerical experiments, thus indicating the potential in wide-spatial radar surveillance. Moreover,this work can be regarded as a preliminary attempt to gauge the efficacy of the computational array, a novel academic concept.

关键词： multi-scale observation wide-spatial surveillance frequency diverse array (FDA) beampattern synthesis frequency diversity gain computational array

Common Fixed Points for Multiplicative Contractions in Multiplicative Metric Spaces

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Wuhan University Journal of Natural Sciences 2024年第1期29卷 13-20页

作者： SONG Jiping LUO Tianqi lei lei College of Mathematics and Physics Leshan Normal UniversityLeshan 614000SichuanChina College of Mathematics Chengdu Normal UniversityChengdu 610000SichuanChina

The study delves into multiplicative contractions,exploring the existence and uniqueness of common fixed points for a weakly compatible pair of *** mappings adhere to specific multiplicative contraction conditions characterized by exponents expressed as fraction multiplicative metric *** is noted that a metric can induce a multiplicative metric,and conversely,a multiplicative metric can give a rise to a metric on a nonempty *** an application,another proof of the existence and uniqueness of the solution of a multiplicative initial problem is given.

关键词： weakly compatible pair of mappings common fixed point multiplicative metric space

Coupled conditional nonlinear optimal perturbations and their application to ENSO ensemble forecasts

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Science China Earth Sciences 2024年第3期67卷 826-842页

作者： Wansuo DUAN lei HU Rong FENG LASG Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

Limitations are existed in current ensemble forecasting initial perturbation methods for describing the interactions among various spheres of the Earth system. In this study, a new method is proposed, namely, the coupled conditional nonlinear optimal perturbation(C-CNOP) method, which incorporates multisphere interactions much appropriately. The El Nino-Southern Oscillation(ENSO) is a typical ocean-atmosphere “coupling”(or “interaction”) phenomenon. The C-CNOP method is applied to ensemble forecasting of ENSO. It is demonstrated that the C-CNOP method can generate coupled initial perturbations(CPs) that appropriately consider initial ocean-atmosphere coupling uncertainty for ENSO ensemble forecasts. Results reveal that the CPs effectively improve the ability of ENSO ensemble-mean forecasts in both temporal variability of Nio3.4 sea surface temperature anomalies(SSTAs) and spatial variability of ENSO mature-phase SSTAs. Notably, despite the weakest ocean-atmosphere coupling strength in the tropical Pacific occurring during the boreal spring and summer, CPs still capture the uncertainties of this weak coupling when ENSO predictions are initialized at these seasons. This performance of CPs significantly suppresses the rapid increase of ENSO prediction errors due to the high ocean-atmosphere coupling instability during these seasons, and thus effectively extends the lead time of skillful ENSO forecasting. Hence, the C-CNOP method is a suitable initial perturbation approach for ENSO ensemble forecast that can describe initial ocean-atmosphere coupling uncertainty. It is expected that the CCNOP method plays a significant role in predictions of other high-impact climate phenomena, and even future Earth system predictions.

关键词： Ensemble forecast Multisphere interaction Initial perturbations ENSO

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多传感器融合的实验室火灾监测控制系统设计

安徽电子信息职业技术学院学报 2023年第1期22卷 6-13页

作者：荀磊江苏工程职业技术学院信息工程学院江苏南通226007

火灾是实验室频发的一种安全事故,具有高危险性和不确定性,成为实验室安全事故防治的重中之重。设计一种“云-管-端”架构的火灾监测控制系统,采用多传感器融合技术监测火灾的特征信号,利用模糊推理判定规则,如判定为火灾,则启动报警和... 详细信息

火灾是实验室频发的一种安全事故,具有高危险性和不确定性,成为实验室安全事故防治的重中之重。设计一种“云-管-端”架构的火灾监测控制系统,采用多传感器融合技术监测火灾的特征信号,利用模糊推理判定规则,如判定为火灾,则启动报警和喷淋灭火。现场测试证明,系统判定火灾正确性高,响应迅速,运行稳定,可以有效预防实验室火灾。

关键词： “云-管-端”架构火灾监测控制多传感器融合模糊推理

制造商与供应商建立合作伙伴关系的两阶段博弈分析

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哈尔滨理工大学学报 2009年第1期14卷 120-122,131页

作者：雷勋平吴金南铜陵学院经济管理系安徽铜陵244000 东南大学经济管理学院江苏南京218889

本文在介绍我国制造商与供应商竞争关系现状的基础上,针对独立的供应商定价决策和制造商订货决策问题,建立了制造商主导合作伙伴关系的两阶段博弈模型,分析讨论了双方建立战略合作伙伴关系的必然性和可能性,并提出了制造商与供应商在建... 详细信息

本文在介绍我国制造商与供应商竞争关系现状的基础上,针对独立的供应商定价决策和制造商订货决策问题,建立了制造商主导合作伙伴关系的两阶段博弈模型,分析讨论了双方建立战略合作伙伴关系的必然性和可能性,并提出了制造商与供应商在建立战略合作伙伴关系的过程中应该注意的三个问题.

关键词：战略合作伙伴关系博弈论供应链不合作博弈合作博弈

“云-管-端”架构下实验室环境监测系统设计与实现

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江苏工程职业技术学院学报 2022年第2期22卷 1-6页

作者：荀磊江苏工程职业技术学院信息工程学院南通226007

近几年频发的实验室安全事故大多缘于管理人员没能及时掌握实验室环境的变化,鉴于此,设计了一种实验室环境监测系统。系统采用“云-管-端”架构,以STM32F103C8T6为主控芯片,通过主控芯片的串口和中国移动M5311通信模组将实验室环境数据... 详细信息

近几年频发的实验室安全事故大多缘于管理人员没能及时掌握实验室环境的变化,鉴于此,设计了一种实验室环境监测系统。系统采用“云-管-端”架构,以STM32F103C8T6为主控芯片,通过主控芯片的串口和中国移动M5311通信模组将实验室环境数据上传至中国移动OneNET云平台,并接收云平台下发的操作命令。实验室现场测试发现,该系统运行稳定,数据传输准确率高,能为实验室的安全运行提供良好的支持。

关键词： “云-管-端”架构实验室环境监测 OneNET云平台

Open-Shell Oligomers and Polymers: Theory, Characterization Methods, Molecular Design, and Applications

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Chinese Journal of Polymer Science 2024年第4期42卷 417-436页

作者： Xue-Qing Wang Cheng Song Ting lei Key Laboratory of Polymer Chemistry and Physics(Ministry of Education) School of Materials Science and EngineeringPeking UniversityBeijing100871China

Open-shell oligomers and polymers have exhibited intriguing electronic and magnetic properties, making them highly desirable for a wide range of applications, including ambipolar organic field-effect transistors (OFETs), photodetectors, organic thermoelectrics, and spintronics. Although open-shell ground states have been observed in certain small molecules and doped organic semiconductors, the exploration of open-shell ground-state conjugated polymers is still limited, and the strategies for designing these polymers remain obscure. This review aims to briefly introduce the theory and characterization methods of open-shell conjugated polymers, along with an overview of recent progress and applications. The objective is to stimulate further advancements and investigations in this promising area by shedding light on the potential of open-shell conjugated polymers and the challenges that lie ahead.

关键词： Conjugated polymers Open-shell molecules High-spin ground state Donor-acceptor(D-A)polymers Optoelectronic and magnetic properties

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安徽铜陵建立横港物流园区现状及对策研究

物流科技 2008年第3期31卷 40-41页

作者：雷勋平铜陵学院安徽铜陵244000

物流业成为"第三利润源"已是不争的事实、21世纪新的经济增长点,也因此成为企业界和学术界研究和关注的热点。论文在介绍物流园区概念的基础上,对安徽铜陵横港建设物流园区的现状进行了SWOT分析,并提出了六个方面的对策,对横港及其他地... 详细信息

物流业成为"第三利润源"已是不争的事实、21世纪新的经济增长点,也因此成为企业界和学术界研究和关注的热点。论文在介绍物流园区概念的基础上,对安徽铜陵横港建设物流园区的现状进行了SWOT分析,并提出了六个方面的对策,对横港及其他地区规划和建设物流园区有一定的指导和借鉴意义。

关键词：第三利润源物流园区安徽铜陵横港对策

Oscillatory Dynamics of Heterogeneous Stem Cell Regeneration

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Communications on Applied Mathematics and Computation 2024年第1期6卷 431-453页

作者： Xiyin Liang Jinzhi lei School of Mathematical Sciences Center for Applied MathematicsTiangong UniversityTianjin300387China

Stem cell regeneration is an essential biological process in the maintenance of tissue homeostasis;dysregulation of stem cell regeneration may result in dynamic diseases that show oscillations in cell *** heterogeneity and plasticity are necessary for the dynamic equilibrium of tissue homeostasis;however,how these features may affect the oscillatory dynamics of the stem cell regeneration process remains poorly ***,based on a mathematical model of heterogeneous stem cell regeneration that includes cell heterogeneity and random transition of epigenetic states,we study the conditions to have oscillation solutions through bifurcation analysis and numerical *** results show various model system dynamics with changes in different parameters associated with kinetic rates,cellular heterogeneity,and *** show that introducing heterogeneity and plasticity to cells can result in oscillation dynamics,as we have seen in the homogeneous stem cell regeneration ***,increasing the cell heterogeneity and plasticity intends to maintain tissue homeostasis under certain *** current study is an initiatory investigation of how cell heterogeneity and plasticity may affect stem cell regeneration dynamics,and many questions remain to be further studied both biologically and mathematically.

关键词： Stem cell regeneration Heterogenous Hopf bifurcation Hematopoietic dynamical disease