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A networked remote sensing system for on-road vehicle emission monitoring

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Science China(Information Sciences) 2017年第4期60卷 224-231页

作者： Yu KANG Yan DING zerui LI Yang CAO Yunbo ZHAO State Key Laboratory of Fire Science University of Science and Technology of China Department of Automation University of Science and Technology of China Institute of Advanced Technology University of Science and Technology of China Chinese Research Academy of Environmental Sciences College of Information Engineering Zhejiang University of Technology

Vehicle emissions are a major source of urban air pollution, and therefore a real-time monitoring system can be very useful in analyzing such emission and consequently assisting the policy making process. In this work we discuss the principle and structure of three different types of remote sensing detectors, and also the key techniques to establish a networked remote sensing monitoring system. We finally conclude this paper with data analysis from some preliminary experiments.

关键词： networked system remote sensing vehicle emissions

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基于探究社区理论的教学反馈实践探索

陕西开放大学学报 2024年第1期26卷 80-85页

作者：黄腾达王泽瑞韩泉叶湖北工业大学计算机学院湖北武汉430068 陕西开放大学计算机学院陕西西安710119

在《机器学习》课程引入了基于探究社区理论的混合教学,通过七周教学实验数据分析,结果表明:基于探究社区理论的混合教学中高活跃度社区所产生的交流信息,对低活跃度社区学业成绩存在明显的提高作用;教师教学提升效果与不同社区之间学... 详细信息

在《机器学习》课程引入了基于探究社区理论的混合教学,通过七周教学实验数据分析,结果表明:基于探究社区理论的混合教学中高活跃度社区所产生的交流信息,对低活跃度社区学业成绩存在明显的提高作用;教师教学提升效果与不同社区之间学习交流信息差有关,信息差越大,效果提升越显著;该教学方式对于促进学生学习的主动性、共同协作解决问题的能力、批判性思维的培养等方面都有一定的积极促进作用。

关键词：探究社区理论混合学习机器学习教学实践

维普期刊数据库博看期刊

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儿童重症监护病房后随访服务的研究进展

护理学杂志 2024年第9期39卷 121-124页

作者：郑泽瑞王林娟周敏魏峰马允昌牟馨深圳市儿童医院儿童重症医学科广东深圳518000

综述国内外儿童重症监护病房后随访服务的现状,包括概念、实施要素、开展情况及实施障碍,为后期进一步构建、实践儿童重症监护病房后随访服务提供参考。

关键词：危重症儿童 PICU 随访服务延续护理重症监护后综合征住院安全护士主导综述文献

New insight into the stability and dynamics of fluid-conveying supported pipes with small geometric imperfections

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Applied Mathematics and Mechanics(English Edition) 2021年第5期42卷 703-720页

作者： Kun ZHOU Qiao NI Wei CHEN Huliang DAI zerui PENG Lin WANG Department of Mechanics School of Aerospace EngineeringHuazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Wuhan 430074China Department of Mechanical Engineering Technische Universitat DarmstadtDarmstadt 64293Germany

In several previous studies,it was reported that a supported pipe with small geometric imperfections would lose stability when the internal flow velocity became sufficiently ***,however,it has become clear that this conclusion may be at best incomplete.A reevaluation of the problem is undertaken here by essentially considering the flow-induced static deformation of a *** the aid of the absolute nodal coordinate formulation(ANCF)and the extended Lagrange equations for dynamical systems containing non-material volumes,the nonlinear governing equations of a pipe with three different geometric imperfections are introduced and *** on extensive numerical calculations,the static equilibrium configuration,the stability,and the nonlinear dynamics of the considered pipe system are determined and *** results show that for a supported pipe with the geometric imperfection of a half sinusoidal wave,the dynamical system could not lose stability even if the flow velocity reaches an extremely high value of ***,for a supported pipe with the geometric imperfection of one or one and a half sinusoidal waves,the first-mode buckling instability would take place at high flow ***,based on a further parametric analysis,the effects of the amplitude of the geometric imperfection and the aspect ratio of the pipe on the static deformation,the critical flow velocity for buckling instability,and the nonlinear responses of the supported pipes with geometric imperfections are analyzed.

关键词： supported pipes conveying fluid geometric imperfection absolute nodal coordinate formulation(ANCF) static equilibrium configuration critical flow velocity nonlinear dynamics

Utilization of nonlinear vibrations of soft pipe conveying fluid for driving underwater bio-inspired robot

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Applied Mathematics and Mechanics(English Edition) 2022年第7期43卷 1109-1124页

作者： Huliang DAI Yixiang HE Kun ZHOU zerui PENG Lin WANG P.HAGEDORN Department of Mechanics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Wuhan 430074China Department of Mechanical Engineering Technische Universität at DarmstadtDarmstadt 64293Germany State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024Liaoning ProvinceChina

Creatures with longer bodies in nature like snakes and eels moving in water commonly generate a large swaying of their bodies or tails,with the purpose of producing significant frictions and collisions between body and fluid to provide the power of consecutive forward *** swaying can be idealized by considering oscillations of a soft beam immersed in water when waves of vibration travel down at a constant *** present study employs a kind of large deformations induced by nonlinear vibrations of a soft pipe conveying fluid to design an underwater bio-inspired snake robot that consists of a rigid head and a soft *** the head is fixed,experiments show that a second mode vibration of the tail in water occurs as the internal flow velocity is beyond a critical *** the corresponding theoretical model based on the absolute nodal coordinate formulation(ANCF)is established to describe nonlinear vibrations of the *** the head is free,the theoretical modeling is combined with the computational fluid dynamics(CFD)analysis to construct a fluid-structure interaction(FSI)simulation *** swimming speed and swaying shape of the snake robot are obtained through the FSI simulation *** are in good agreement with experimental *** importantly,it is demonstrated that the propulsion speed can be improved by 21%for the robot with vibrations of the tail compared with that without oscillations in the pure jet *** research provides a new thought to design driving devices by using nonlinear flow-induced vibrations.

关键词： soft pipe conveying fluid underwater bio-inspired robot flutter fluidstructure interaction(FSI) absolute nodal coordinate formulation(ANCF)

影响子宫内膜非典型增生及早期子宫内膜癌保留生育功能患者复发的临床因素分析

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中国妇产科临床杂志 2024年第2期25卷 99-103页

作者：肖泽睿王益勤周蓉鹿群田莉王建六北京大学人民医院妇产科北京100044 首都医科大学附属朝阳医院北京100020

目的探讨子宫内膜非典型增生(AEH)及子宫内膜癌(EC)患者保留生育功能完全缓解后复发的相关影响因素。方法采用回顾性研究2009年1月至2023年3月在北京大学人民医院接受保留生育功能随访时间6个月以上并且完全缓解的EC及AEH患者240例。采... 详细信息

目的探讨子宫内膜非典型增生(AEH)及子宫内膜癌(EC)患者保留生育功能完全缓解后复发的相关影响因素。方法采用回顾性研究2009年1月至2023年3月在北京大学人民医院接受保留生育功能随访时间6个月以上并且完全缓解的EC及AEH患者240例。采用Kaplan-Meier生存分析及log-rank检验比较无复发生存时间,logistic回归分析及Cox生存分析评估影响复发相关因素。结果240例患者中位随访时间44.70个月(23.93个月,80.25个月),复发率为24.58%(59/240),其中EC的复发率为30.9%(34/110),AEH为19.2%(25/130)。患者中位无复发生存时间为19.58个月(10.16个月,41.53个月)。logistics回归分析显示,病理类型(P=0.014)、口服孕激素时间(P=0.024)、身体形态指数(P=0.009)、合并肥胖(P=0.005)及身体圆度指数(P=0.01)是影响完全缓解后的EC及AEH患者的复发的主要因素。K-M生存分析显示,病理类型(P=0.015)和是否接受维持治疗(P=0.020)组间的无复发生存时间比较,差异有统计学意义。多因素Cox生存回归分析显示,病理类型(P=0.017),身体形态指数(P=0.003)和肥胖(P=0.009)是影响EC及AEH患者完全缓解后复发的独立危险因素。结论EC及AEH患者在接受保留生育功能治疗完全缓解后,病理类型、身体形态指数、合并肥胖、身体圆度指数及是否接受维持治疗为影响复发的危险因素。

关键词：子宫内膜癌子宫内膜非典型增生保留生育功能肿瘤复发身体形态指数

High regional genetic differentiation of an endangered relict plant Craigia yunnanensis and implications for its conservation

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Plant Diversity 2016年第5期38卷 221-226页

作者： Jing Yang zerui Gao Weibang Sun Changqin Zhang Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of Sciences Yunnan Tobacco Industrial Hi-tech Material CO. LTD Kunming Botanical Garden Kunming Institute of BotanyChinese Academy of Sciences

Of the genus Craigia,widespread in the Tertiary,only two relict species survived to modern *** species is now possibly extinct and the other one,Craigia yunnanensis,is severely *** surveys have located six *** populations in Yunnan province,southwest *** fluorescent amplified fragment length polymorphism(AFLP),the genetic diversity and population structure of these populations were *** was found that genetic diversity of *** was moderate at the species level,but low at regional and population *** of population structure showed significant genetic differentiation between Wenshan and Dehong regions,apparently representing two geographically isolated for long time *** are also clear indications of isolation between populations,which,together with anthropogenically caused decline of population size,will lead to general loss of the species genetic variation with subsequent loss of adaptive *** conserve the genetic integrity of ***,we recommend that ex-situ conservation should include representative samples from every population of the two differentiated regions(*** and Dehong).The crosses between individuals originated from different regions should be avoided because of a high risk of outbreeding *** all the extant populations of *** are in unprotected areas with strong anthropogenic impact,there is no alternative to reintroduction of *** into suitable protected locations.

关键词： Craigia yunnanensis Isolation AFLP Genetic diversity Population genetic structure Conservation genetics

Particle captured by a field-modulating vortex through dielectrophoresis force

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Chinese Physics B 2022年第3期31卷 382-391页

作者： Bing Yan Bo Chen zerui Peng Yong-Liang Xiong School of Aerospace Engineering Huazhong University of Science and TechnologyWuhan 430074China

In microfluidic technology, dielectrophoresis(DEP) is commonly used to manipulate particles. In this work, the fluid–particle interactions in a microfluidic system are investigated numerically by a finite difference method(FDM) for electric field distribution and a lattice Boltzmann method(LBM) for the fluid flow. In this system, efficient particle manipulation may be realized by combining DEP and field-modulating vortex. The influence of the density(ρ_(p)), radius(γ), and initial position of the particle in the y direction(y_(p0)), and the slip velocity(u_(0)) on the particle manipulation are studied systematically. It is found that compared with the particle without action of DEP force, the particle subjected to a DEP force may be captured by the vortex over a wider range of parameters. In the y direction, as ρ_(p) or γ increases, the particle can be captured more easily by the vortex since it is subjected to a stronger DEP force. When u_(0) is low, particle is more likely to be captured due to the vortex–particle interaction. Furthermore, the flow field around the particle is analyzed to explore the underlying mechanism. The results obtained in the present study may provide theoretical support for engineering applications of field-controlled vortices to manipulate particles.

关键词： field-modulating vortex dielectrophoresis fluid–particle interactions

高速公路复合型路基金属结构声屏障施工关键技术

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科学技术创新 2024年第17期 157-160页

作者：谷传海纪港李泽睿中交路桥建设有限公司总承包分公司北京

为减少公路两侧噪音,提高周围群众的生活质量。声屏障的设计、施工工作,一直是建筑学界研究的重点方向。在过去,我国主要采用玻璃钢声屏障隔绝高速公路上的噪音,但由于该声屏障声学性能、力学性能及耐老化性能不足等问题,已经难以满足... 详细信息

为减少公路两侧噪音,提高周围群众的生活质量。声屏障的设计、施工工作,一直是建筑学界研究的重点方向。在过去,我国主要采用玻璃钢声屏障隔绝高速公路上的噪音,但由于该声屏障声学性能、力学性能及耐老化性能不足等问题,已经难以满足时代发展的迫切需求。在这样的时代背景下,金属结构声屏障因其降噪效果好、经久耐用、安装方便受到广泛关注。鉴于此,本文将依托四川天府新区至邛崃高速绿化项目进行复合型声屏障设置研究,即在噪声源与受声点之间插入开白叶孔铝合金吸声板,使声波在传播过程中受到障碍物影响而引起明显的衰减,旨在减少附近居民所在一定区域的噪音影响,希望能够起到一定的参考作用。

关键词：高速公路降噪复合型路基金属结构声屏障施工技术