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Boosting daytime radiative cooling performance with nanoporous polyethylene film

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Energy and Built Environment

Energy and Built Environment 2023年第2期4卷 131-139页

作者： Junwei Liu huajie tang Ji Zhang Debao Zhang Shifei Jiao Zhihua Zhou Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityTianjin 300350China China Academy of Building Research Beijing 100013China China IPPR International Engineering Co. LtdBeijing 100089China

Radiative cooling without energy consumption and environmental pollution holds great promise as the next-generation cooling technology.To date,daytime radiative cooling performance is still slightly low,especially in humid areas.In this work,we demonstrated that nanoporous polyethylene(Nano PE)film can improve solar reflectivity from 96%to 99%,thus boosting radiative cooling performance.Moreover,the experimental results in humid areas indicate that Nano PE films can improve radiative cooling performance by∼76%in a clear day and 120%in a day with few clouds.Additionally,compared with ordinary PE films,thin Nano PE films have significantly higher weather fastness and mechanical strength.More importantly,nano PE films can scatter part of visible light,thus suppressing the generation of light pollution in practical applications.Lastly,the modeling results reveal that with Nano PE films,more than 95%of China’s areas can achieve daytime cooling performance.Our work can boost the development of radiative cooling technology with a very low cost.

关键词： Daytime radiative cooling Nano PE films Solar reflectivity Radiative cooling performance

A 2Mbps Human Body Communication Transceiver Based on Body Antenna Effect

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Journal of Beijing Institute of Technology 2022年第1期31卷 39-52页

作者： huajie tang Pengfei Ao kun Wang Yuhang Liu Jingzhen Li Abhishek Kandwal Zedong Nie Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China

This paper presents a human body communication(HBC)transceiver for wireless body network applications.The transceiver employs on frequency shift keying(FSK)modulation and op-erates in 40 MHz-60 MHz which is the resonant frequency of the human body as an antenna.It achieves high performance and stability through establish passive microstrip line and via models and active device-models.The proposed transceiver is designed and fabricated by FR4 printed cir-cuit board(PCB)process,the transceiver has the ability of configurable data rate up to 2 Mbps and it achieves-86 dBm receiving sensitivity at 2 Mbps data rate.Meanwhile,the transceiver out-put power dynamics range is 34 dB.Furthermore,with a visual interaction interface,the transceiv-er can be agility use in a variety of scenarios.Its measurements are verified on human body.The result shows that the transceiver has ability to send data from person to person by relying on hu-man body antenna radiation.The transceiver shows great prospect in wireless body area networks(WBAN)for telemedicine and emergency communication.

关键词： human body antenna human body communication(HBC) transceiver wireless body artworks(WAN) frequency shift keying(FSK)modulation medical monitoring

A Novel Flexible Antenna at Very High Frequency Band for On-Body Applications

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Journal of Beijing Institute of Technology 2022年第1期31卷 81-90页

作者： Abhishek Kandwal huajie tang Pengfei Ao Kun Wang Jingzhen Li Yuhang Liu Tobore Igbe Zedong Nie Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China

This paper proposes a novel flexible antenna design operating at very high frequency(VHF)band for on-body applications such as human body communication(HBC).The antenna consists of back-to-back E-shaped fractal and complimentary structures designed over a thin flex-ible substrate.The overall design working on the principle of fractal geometries and capacitive coupling is highly beneficial to achieve better antenna characteristics even at low frequencies around 35 MHz-45 MHz that are being used for HBC application.The proposed antenna obtained a large bandwidth of around 10.0 MHz in air and a bandwidth of around 8.0 MHz during on-body opera-tion.The antenna has been tested in three different scenarios viz.air,on-body single antenna and on-body communication using two antennas.The insertion loss is reduced to a minimum in all three scenarios,which is quite beneficial for better signal transmission.The size miniaturization with high flexibility in such low frequencies has also been achieved in the paper that makes the proposed design suitable for human body communication applications.

关键词： antenna very high frequency(VHF) human body communication(HBC) bandwidth loss flexible

大长径比远程制导火箭弹自适应Super-twisting控制方法

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中国惯性技术学报 2024年第2期32卷 196-204,212页

作者：范军芳闫华杰纪毅唐文桃赵国宁北京信息科技大学自动化学院北京100192 高动态导航技术北京市重点实验室北京100192 北京自动控制研究所北京100074

针对具有轻质薄壳结构的大长径比远程制导火箭弹刚体-弹性体耦合动力学控制难题,提出了一种自适应Super-twisting控制方法。首先,将大长径比远程制导火箭弹的弹性模态与外部干扰项视为归一化扰动,建立了考虑参数、模型不确定性的刚体-... 详细信息

针对具有轻质薄壳结构的大长径比远程制导火箭弹刚体-弹性体耦合动力学控制难题,提出了一种自适应Super-twisting控制方法。首先,将大长径比远程制导火箭弹的弹性模态与外部干扰项视为归一化扰动,建立了考虑参数、模型不确定性的刚体-弹性体耦合动力学模型。针对外部扰动难以实时精准获取的问题,设计了有限时间收敛干扰观测器,能够在大范围气动参数摄动情形下对远程制导火箭弹外部扰动进行实时精准估计。为提高系统鲁棒性,设计了基于Super-twisting算法的自适应有限时间控制方法,使系统能根据状态误差自动调节控制参数,在削弱高频抖振的同时有效提高抗干扰能力。仿真结果表明:所提控制方法在弹体±15%气动参数摄动的条件下,由平飞状态转变为跟踪幅值为10的正弦弹道倾角指令时,实现3.2 s内弹道倾角跟踪误差收敛至0.002°,可实现远程制导火箭弹姿态平稳跟踪控制弹道倾角指令。

关键词：远程制导火箭弹弹性效应自适应Super-twisting 有限时间收敛扰动观测器

Transient Behaviors of Thermo-Hydraulic and Thermal Stratification in the Pressurizer Surgeline for the Nuclear Power Plant

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Journal of Thermal Science 2022年第2期31卷 344-358页

作者： YU huajie LI Lu tang Qionghui PENG Yue LI Yinshi State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment Shenzhen 518172China Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China

In pressurized water reactor(PWR)system,the surgeline plays an important role in bonding the pressurizer and the primary circle.Some considerable problems,including the thermo-hydraulics,the thermal stratification and the accompanying thermal stress under transient conditions,pose risks to the surgeline integrity.Herein,a fully-coupled flow-heat-thermo-elasticity model was developed to investigate the transient behavior of thermo-hydraulic parameters and the thermal stratification phenomenon in PWR.To evaluate the nonuniformity of the stratified flow,a stratification degree indicatorζis introduced.It is found that during the outsurge flow,the increase of temperature variation will enlarge the temperature gradient on the wall,corresponding to a more serious deformation.In the cases of positive temperature variation,the higher temperature variation causes higher stratification degreeζ,and vice versa.The mass flow rate m and the stratification degree are in negative correlation.The local deformation can reach 1.802 cm under a 50 K temperature variation,while its location varies from case to case.More attention should be paid to the regulation between the highest deformation location and the surgeline thermo-hydraulic parameters.

关键词： pressurized water reactor surgeline transient thermo-hydraulic thermal stratification thermal stress-strain

高校思政课融合传统文化的价值探析——基于国家认同的视角

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文化创新比较研究 2024年第8期8卷 115-118页

作者：廖华洁潘会文唐静芳广西科技师范学院马克思主义学院广西来宾546100

培养国家认同是高校思政课的重要使命。中华优秀传统文化蕴含着丰富的国家认同思想资源,承载着国家共同的历史记忆和价值理念。将传统文化融入高校思政课的国家认同教育有益于激发学生的共鸣,有助于学生将国家认同由思想自觉落实为行动... 详细信息

培养国家认同是高校思政课的重要使命。中华优秀传统文化蕴含着丰富的国家认同思想资源,承载着国家共同的历史记忆和价值理念。将传统文化融入高校思政课的国家认同教育有益于激发学生的共鸣,有助于学生将国家认同由思想自觉落实为行动自觉,有助于大学生将个人梦与中国梦进行更充分结合。该文主要研究中华优秀传统文化中有益于培养国家认同的思想资源,以及思政课融合传统文化对培养国家认同的价值优势,探讨思政课融合传统文化涵养大学生国家认同的实践路径。高校思政课应充分挖掘传统文化中有益于培养国家认同的思想资源,并对其进行创新性转化和创造性发展,培养高素质的教师队伍,运用现代信息化技术促进传统文化与思政课的融合,增强国家认同培养的实效性。

关键词：国家认同思政课传统文化融合价值大学生

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芍药PlSPL1基因克隆与表达特性分析

华北农学报 2024年第2期39卷 55-61页

作者：许华杰卢莉莉汤寓涵赵大球孟家松陶俊扬州大学园艺园林学院江苏扬州225009 扬州大学教育部农业与农产品安全国际联合实验室江苏扬州225009

为研究芍药PlSPL1(SPL)基因的性质和功能,进一步阐明PlSPL1基因在不同物种中的共性与特征差异,探明PlSPL1在芍药茎秆挺直程度中的作用。以芍药红峰茎秆为材料,采用RACE技术获得了芍药PlSPL1基因全长序列,利用生物信息学软件分析预测PlS... 详细信息

为研究芍药PlSPL1(SPL)基因的性质和功能,进一步阐明PlSPL1基因在不同物种中的共性与特征差异,探明PlSPL1在芍药茎秆挺直程度中的作用。以芍药红峰茎秆为材料,采用RACE技术获得了芍药PlSPL1基因全长序列,利用生物信息学软件分析预测PlSPL1的结构、理化性质和亲缘关系,随后利用qRT-PCR技术分析PlSPL1在芍药茎秆不同发育时期的表达量,并通过激光共聚焦扫描显微技术进行了蛋白质亚细胞定位分析。结果表明:PlSPL1基因开放阅读框为3000 bp,编码999个氨基酸。蛋白分子式为C_(4869)H_(7682)N_(1406)O_(1497)S_(43),分子量为111.25 ku,理论等电点为6.26,编码亲水性不稳定酸性蛋白,磷酸化修饰以丝氨酸为主,无信号肽,有跨膜结构,二级结构主要由无规则卷曲组成。系统进化树分析发现,PlSPL1蛋白与牡丹的亲缘关系最近,其次和葡萄有较近的亲缘关系;蛋白序列比对分析发现,PlSPL1蛋白具有SPL转录因子家族特有的SBP保守结构域。相对表达量分析发现,PlSPL1随着茎秆发育逐渐呈现下降趋势,表明PlSPL1负向调控芍药茎秆发育,推测其可能在茎秆挺直程度方面起重要作用;亚细胞定位显示,PlSPL1蛋白定位在细胞核中。上述结果表明,PlSPL1参与芍药茎秆发育过程。

关键词：芍药 SPL 基因克隆表达模式亚细胞定位

Repeated Wildfires in the Middle Jurassic Xishanyao Formation(Aalenian and Bajocian Ages) in Northwestern China

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Acta Geologica Sinica(English Edition) 2022年第5期96卷 1752-1763页

作者： HOU Haihai SHAO Longyi LIANG Guodong tang Yue ZHANG huajie ZHANG Jiaqiang College of Mining Liaoning Technical UniversityFuxinLiaoning 123000China College of Geoscience and Surveying Engineering China University of Mining and TechnologyBeijing 100083China Oil&Gas Resource Survey Center China Geological SurveyMinistry of Land and ResourceBeijing 100029China

The coal-bearing strata in the southern Junggar Basin in northwestern China have recently attracted the attention of coal geologists. Its abundance of coal resources is of great interest as there is a potential of unlocking details about the palaeoclimatic information. Coal deposits have the capacity to record wildfire events, even those with inefficient combustions. To characterize wildfire events and palaeoclimatic history of the Middle Jurassic Xishanyao Formation(Aalenian and Bajocian ages), 22 coal samples from borehole cores and coal mines in the southern Junggar Basin were collected and their macerals were analyzed. The results indicated that fusinite and semi-fusinite were the dominant components of inertinite with proportions of 35.27% and 54.67%, respectively. The presence of inertinite is an indicator that wildfires occurred at the time of peat land development, and the widespread occurrence suggests large scale wildfires during the Middle Jurassic. This study proposes a new parameter for the evaluation of wildfire features by combining burning frequency and burning temperature. The comprehensive evaluation index(CEI) was influenced by the lacustrine basin level and ancient plant types from a sequence framework. During the Middle Jurassic, most wildfires were surface fires with low level and ground fire with high level. High oxygen levels were estimated in the lower, middle, and upper members of the Xishanyao Formation with corresponding to 26.78%, 24.55%, and 23.55%, respectively. The high oxygen levels would be the primary cause of repeated wildfires in the Middle Jurassic. These results are helpful for understanding palaeoclimatic changes in the Middle Jurassic.

关键词： wildfire charcoal Middle Jurassic comprehensive evaluation index northwestern China

基于改进的YOLOv5龙眼果柄位置识别与检测方法

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现代工业经济和信息化 2024年第4期14卷 90-94页

作者：肖熠鹏白伟华唐华杰肇庆学院广东肇庆526061

提出一种基于改进的YOLOv5s目标检测算法的龙眼果柄识别方法,以满足高效果柄位置识别及加工作业精细化管理需求。针对龙眼体积小,果柄与果实颜色相近等影响因素,引入CBAM注意力机制,强化对果柄位置特征的关注学习。同时简化模型复杂度,... 详细信息

提出一种基于改进的YOLOv5s目标检测算法的龙眼果柄识别方法,以满足高效果柄位置识别及加工作业精细化管理需求。针对龙眼体积小,果柄与果实颜色相近等影响因素,引入CBAM注意力机制,强化对果柄位置特征的关注学习。同时简化模型复杂度,减少检测时间。在颈部网络中采用加权双向特征金字塔网络BIFPN,优化多尺度特征融合机制,提升模型检测精度。实验结果表明,改进的YOLOv5算法检测识别效果优于初始模型,能满足自动化龙眼剥壳中对果柄位姿检测精度及效率要求。

关键词：龙眼果柄 YOLOv5 位置检测