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A low-power Bluetooth-based wireless sensor network and its global confliction-solving impact localization method

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Chinese Journal of Aeronautics 2024年第1期37卷 153-161页

作者： Yuanjia WANG Lei QIU Qiyun XU liming SHI College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Electrical and Electronic Engineering University of EdinburghEdinburgh EH89YLUK

During the whole service lifetime of aircraft structures with composite materials,impacts are inevitable and can usually cause severe but barely visible *** the occurrences of impact are random and unpredictable,it is a hotspot direction to develop an online impact monitoring system that can meet strict limitations of aerospace applications including small size,light weight,and low power ***(PZT)sensor,being able to generate impact response signals with no external power and cover a large-scale structure with only a small amount of them,is a promising ***,for real systems,networks with multiple nodes are normally required to monitor large-scale structures in a global way to identify any impact localization confliction,yet the existing studies are mostly evaluated with single nodes instead of ***,in this paper,based on a new low-power node designed,a Bluetooth-based digital impact monitoring PZT sensor network is proposed for the first time with its global confliction-solving impact localization *** of the system as a network are researched and analyzed on a complex real aircraft wing box for a global confliction-solving impact localization,showing a satisfying high accuracy.

关键词： Bluetooth-based low-power design Confliction-solving evaluation Complex composites Piezoelectric sensors Wireless impact monitoring network

地龙蛋白对糖尿病性勃起功能障碍大鼠阴茎海绵体平滑肌细胞表型转化的影响

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中国性科学 2024年第5期33卷 1-6页

作者：冀小卫辛学燕舒译张爱平刘黎明杨佳树邢喜平甘肃中医药大学兰州730000 邹平市洪济中医医院生殖科山东滨州265200 湖南中医药大学长沙410000 甘肃中医药大学附属医院男科兰州730000

目的探讨地龙蛋白对糖尿病性勃起功能障碍(DMED)大鼠阴茎海绵体平滑肌细胞(CCSMC)表型转化的影响,以明确地龙蛋白改善DMED大鼠勃起功能的机制。方法于2021年7月选取60只SPF级雄性SD大鼠作为研究对象,随机选取50只腹腔注射链脲佐菌素(ST... 详细信息

目的探讨地龙蛋白对糖尿病性勃起功能障碍(DMED)大鼠阴茎海绵体平滑肌细胞(CCSMC)表型转化的影响,以明确地龙蛋白改善DMED大鼠勃起功能的机制。方法于2021年7月选取60只SPF级雄性SD大鼠作为研究对象,随机选取50只腹腔注射链脲佐菌素(STZ),构建糖尿病(DM)大鼠模型,余下10只作为正常组。8周后大鼠颈部皮下注射阿朴吗啡(APO),并筛选出DMED大鼠。将DMED大鼠随机分为模型组、西地那非组及地龙蛋白低、中、高剂量组(45、90、180 mg/kg),各6只,并随机选取正常组6只作为空白组。给药4周后,检测大鼠血糖、体重、阴茎海绵体内压(ICP)和颈动脉内压(MAP)水平,计算ICP/MAP评估大鼠勃起功能。采用免疫组织化学法检测大鼠阴茎海绵体中收缩型标志物碱性调宁蛋白(Caiponin)、肌间线蛋白(Desmin)表达水平;采用实时荧光定量聚合酶链反应检测阴茎海绵体中Desmin、骨桥蛋白(OPN)mRNA表达水平;采用Western blotting法检测阴茎海绵体中Caiponin、平滑肌肌球蛋白重链(SMMHC)蛋白表达水平。结果与空白组比较,模型组大鼠体重、ICP/MAP显著下降,血糖显著升高(P0.05);各给药组大鼠阴茎海绵体中Caiponin、Desmin表达显著上升(P<0.01);Desmin mRNA表达显著上升,OPN mRNA表达显著下降(P<0.01);Caiponin、SMMHC蛋白表达显著上升(P<0.01)。结论地龙蛋白可通过上调阴茎海绵体组织中合成型(增殖型)标志蛋白或下调收缩型标志蛋白影响CCSMC转化,进而改善DMED大鼠的勃起功能。

关键词：地龙蛋白勃起功能障碍糖尿病阴茎海绵体平滑肌细胞表型转化

Improved YOLOv5 foreign object detection for transmission lines

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Optoelectronics Letters 2024年第8期20卷 490-496页

作者： ZHOU liming LI Shixin ZHU Zhiren CHEN Fankai liu Chen DONG Xiuhuan Electrical Engineering Department Tianjin University of Technology and EducationTianjin 300222China

The traditional transmission line detection has the problems of low *** improve the performance,this paper proposes an improved you only look once version 5(YOLOv5)transmission line foreign object detection ***,efficient channel attention(ECA)module is introduced in the backbone network for focusing the target features and improving the feature extraction capability of the ***,bilinear interpolation upsampling is introduced in the neck network to improve the model detection ***,by integrating the efficient intersection over union(EIoU)loss function and Soft non-maximum suppression(Soft NMS)algorithm,the convergence speed of the model is accelerated while the detection effect of the model is *** to the original algorithm,the improved algorithm reduces the number of parameters by 16.4%,increases the mean average precision(mAP)@0.5 by 3.9%,mAP@0.5:0.95 by 6.3%,and increases the detection speed to 55.3 frames per second(FPS).The improved algorithm is able to improve the performance of the foreign object detection in transmission lines effectively.

关键词： network algorithm union

Sulfated peptides and their receptors:Key regulators of plant development and stress adaptation

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Plant Communications 2024年第6期5卷 44-56页

作者： liming He Liangfan Wu Jia Li Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life SciencesLanzhou UniversityLanzhou 730000China Guangdong Provincial Key Laboratory of Plant Adaptation and Molecular Design School of Life SciencesGuangzhou UniversityGuangzhou 510006China

Four distinct types of sulfated peptides have been identiﬁed in Arabidopsis *** peptides play crucial roles in regulating plant development and stress *** studies have revealed that Xan-thomonas and Meloidogyne can secrete plant-like sulfated peptides,exploiting the plant sulfated peptide signaling pathway to suppress plant *** the past three decades,receptors for these four types of sulfated peptides have been identiﬁed,all of which belong to the leucine-rich repeat receptor-like protein kinase subfamily.A number of regulatory proteins have been demonstrated to play important roles in their corresponding signal transduction *** this review,we comprehensively summarize the discov-eries of sulfated peptides and their receptors,mainly in Arabidopsis *** also discuss their known biological functions in plant development and stress ***,we put forward a number of ques-tions for reference in future studies.

关键词： peptide hormone sulfated peptide receptor-like protein kinase plant development stress adaptation

Polyoxometalates for continuous power generation by atmospheric humidity

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Nano Research 2024年第3期17卷 1875-1885页

作者： Tuo Ji Weilin Chen Zhenhui Kang liming Zhang Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education Northeast Normal UniversityChangchun 130024China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices DepartmentSoochow UniversitySuzhou 215123China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyTaipaMacao 999078China Institute of Functional State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

Atmospheric humidity is a sustainable low-value energy widely existing in natural environment,which is a promising candidate to solve the noncontinuous and low efficiency of low-value energy power *** the mono-substituted Dawson-type polyoxometalates are constructed to be highly dispersed organic ammonium-polyoxoanion clusters and are assembled into thin films power generators with micropores,working in atmospheric *** optimal polyoxometalates generator with the thickness of 7.2μm and the area of 0.36 cm^(2) produces a voltage of 0.68 V and a current density of 19.5μA·cm^(-2) under simulated natural environment,and works continuously and stably under almost all-natural environments(humidity 10%–90%).The highly dispersed polyoxometalate nanoclusters can form microporous in polyoxometalate films to effectively absorb atmospheric humidity and spontaneously form distribution gradient of water,which is the structural basis of power *** continuous power generation may be maintained by the effective adsorption and utilization of H_(2)O,the huge electrostatic field of organic ammonium-polyoxoanion clusters,and the reasonably designed polyoxometalates containing inorganic small ions with high *** is the first humidity generator designed with polyoxometalates,which may provide a new research direction for polyoxometalates in sustainable utilization of low-value energy.

关键词： atmospheric humidity continuous power generations nanomaterials polyoxoanions polyoxometalates

燃料电池有轨电车冷却装置降噪设计及试验研究

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机械工程学报 2017年第4期53卷 97-104页

作者：李明刘楠韩铁礼中车唐山机车车辆有限公司产品技术研究中心唐山063035

以氢为能源进行发电的燃料电池动力系统,是具备清洁、高效、无污染等优点的清洁能源技术,是城市轨道交通的首选。冷却装置是保证燃料电池有轨电车正常工作的关键部件之一,高效冷却系统往往也带来噪声过大的问题,影响到有轨电车车内乘坐... 详细信息

以氢为能源进行发电的燃料电池动力系统,是具备清洁、高效、无污染等优点的清洁能源技术,是城市轨道交通的首选。冷却装置是保证燃料电池有轨电车正常工作的关键部件之一,高效冷却系统往往也带来噪声过大的问题,影响到有轨电车车内乘坐舒适度。针对有轨电车用燃料电池冷却系统车顶空间紧凑及散热量大、噪声低等设计要求,试验研究不同散热器翅片形式、冷却风机叶片形式及不同降噪材料铺贴方案下冷却装置的声学性能;通过对比试验结果,获得了较优冷却系统结构及降噪材料组合方案,降噪量达到2.9 d BA,在此基础上完成了燃料电池系统冷却装置的集成设计。样机测试结果表明,该型燃料电池冷却系统在高效散热的同时,达到了低噪声的设计要求。

关键词：燃料电池系统有轨电车冷却装置低噪声

Cyber-Syndrome:Concept,Theoretical Characterization,and Control Mechanism

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Tsinghua Science and Technology 2024年第3期29卷 721-735页

作者： Feifei Shi Huansheng Ning liming Chen Sahraoui Dhelim School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China Faculty of Computing Ulster UniversityNewtownabbeyBT370QBUK School of Computer Science University College DublinDublinD04 V1W8Ireland

The prevalence of social media and mobile computing has led to intensive user engagement in the emergent Cyber-Physical-Social-Thinking(CPST)***,the easy access,the lack of governance,and excessive use has generated a raft of new behaviors within CPST,which affects users’physical,social,and mental *** this paper,we conceive the Cyber-Syndrome concept to denote the collection of cyber disorders due to excessive or problematic Cyberspace interactions based on CPST *** we characterize the Cyber-Syndrome concept in terms of Maslow’s theory of Needs,from which we establish an in-depth theoretical understanding of Cyber-Syndrome from its etiology,formation,symptoms,and ***,we propose an entropy-based Cyber-Syndrome control mechanism for its computation and *** goal of this study is to give new insights into this rising phenomenon and offer guidance for further research and development.

关键词： Cyber-Syndrome cyber-physical systems Cyber-Physical-Social-Thinking(CPST)space Maslow’sHierarchy of Needs entropy

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高分子材料塑料的激光焊接工艺及性能

焊接学报 2007年第5期28卷 97-100页

作者：谢龙刘黎明大连理工大学三束材料改性国家重点实验室辽宁大连116024

在激光焊接塑料理论的基础上,采用YAG激光器焊接聚丙烯(PP)塑料薄板,研究了激光焊接热塑性塑料的可行性。从焊缝的外部形貌可以看出激光焊接可以得到接近于母材色度的焊缝。对焊缝进行液氮脆断,断口喷银处理后,运用扫描电镜观测断口形貌... 详细信息

在激光焊接塑料理论的基础上,采用YAG激光器焊接聚丙烯(PP)塑料薄板,研究了激光焊接热塑性塑料的可行性。从焊缝的外部形貌可以看出激光焊接可以得到接近于母材色度的焊缝。对焊缝进行液氮脆断,断口喷银处理后,运用扫描电镜观测断口形貌,发现断口没有飞边和夹渣,焊接接头良好。对焊接试样进行了力学拉伸试验。结果表明,运用激光焊接聚丙烯板,接头的力学性能接近母材强度。证实了激光焊接是一种可行的、更佳的塑料焊接方法。

关键词：焊接激光塑料断口形貌力学性能

Design and parameters optimization of the curved sieve for an air suction jujube harvester

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International Journal of Agricultural and Biological Engineering 2024年第2期17卷 132-139页

作者： Shenghe Bai Yanwei Yuan Kang Niu liming Zhou Bo Zhao Liguo Wei Lijing liu Xuejun Zhang College of Engineering China Agricultural UniversityBeijing 100083China National Key Laboratory of Agricultural Equipment Technology Chinese Academy of Agricultural Mechanization Sciences Group Co.Ltd.Beijing 100083China College of Mechanical and Electrical Engineering Xinjiang Agricultural UniversityUrumqi 830052China

In order to improve the screening performance and cleaning effect of the jujube harvesting machinery cleaning device,a vibrating curved screen device was designed in this *** analyzing the structure mechanism of the curved sieve body,it was obtained that the arc-shaped mesh hole spacing S was 15-25 mm and the curved mesh hole curvature U was 90°-150°.By exploring the movement state and stress of jujube and impurities on the curved sieve body,it was determined that the horizontal spacing L of the curved layer sieve was 30 mm and the vertical spacing H was 45-65 *** the vertical spacing H of the curved layer sieve,the curvature U of the curved mesh hole,and the spacing S of the curved mesh hole as the experimental factors,considering the screening efficiencyαand the impurity contentβof the jujube as the response values,the three-factor three-level quadratic regression orthogonal experiment was designed,establishing the regression mathematical model of each factor and response value,and the multiple target optimization algorithm of Design-expert software was used to optimize various *** results showed that the influence factors on the screening efficiency were in the descending order as:the arc screen spacing,the vertical spacing of the curved layer screen,and the curved screen hole curvature;The significant factors affecting the impurity content of jujube were in the descending order as:the arc screen spacing,the curved screen hole curvature,and the vertical spacing of the curved layer *** experimental results were verified by the optimized combination of parameters:when the vertical spacing H of the curved layer screen was 65 mm,the curved screen hole curvature U was 110°,and the arc screen spacing S was 23 mm,the average screening efficiencyαin the test was 91.09%.The relative error between the experimental verification value and the theoretical optimization value was 1.36%,which was less than 5%.The impurity content of jujubeβin the test w

关键词： jujube harvesting cleaning device curved sieve sieve structure conveying pipe mathematical model