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Characterization of size-resolved aerosol hygroscopicity and liquid water content in Nanjing of the yangtze River Delta

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Journal of Environmental Sciences 2025年第5期151卷 26-41页

作者： Youling Jiang yan Ma Jun Zheng Nan Ye cheng Yuan School of Environmental Science and Engineering Nanjing University of Information Science and TechnologyNanjing 210044China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Nanjing University of Information Science&TechnologyNanjing 210044China School of Emergency Management Nanjing University of Information Science&TechnologyNanjing 210044China

Aerosol hygroscopicity and liquid water content(ALWC)have important influences on the environmental and climate effect of *** this study,we measured the hygroscopic growth factors(GF)of particles with dry diameters of 40,80,150,and 200 nm during the wintertime in *** the GF-derived hygroscopicity parameter(κ_(gf))and ALWC increased with particle size,but displayed differing diurnal variations,withκ_(gf)peaking around the midday,while ALWC peaking in the early ***,ammonium and oxygenated organic aerosols(OOA)were found as the chemical components mostly strongly correlated with ALWC.A closure study suggests that during midday photo-oxidation and nighttime high ALWC periods,theκof organic aerosols(κ_(org))was underestimated when using previous ***,we re-constructed parameterizations forκ_(org)and the oxidation level of organics for these periods,which indicates a higher hygroscopicity of photochemically formed OOA than the aqueous OOA,yet both being much higher than the generally assumed OOA ***,in a typical high ALWC episode,concurrently increased ALWC,nitrate,OOA as well as aerosol surface area and mass concentrations were observed under elevated ambient *** strongly indicates a coupled effect that the hygroscopic secondary aerosols,in particular nitratewith strong hygroscopicity,led to large increase in ALWC,which in turn synergistically boosted nitrate and OOA formation by heterogeneous/aqueous *** interaction may represent an important mechanism contributing to enhanced formation of secondary aerosols and rapid growth of fine particulate matter under relatively high RH conditions.

关键词： Aerosol hygroscopicity Aerosol liquid water content Photo-oxidation Aqueous/heterogeneous reactions

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High-precision laser monitoring system with enhanced non-uniform scanning for railway safety

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Railway Engineering Science 2025年第1期33卷 79-93页

作者： Yingying yang cheng Wang Xiaoqi Liu Yu Liu Weier Lu Zhonglin Zhu Hongye yan Guotang Zhao Xuechun lin Laboratory of All‑Solid‑State Light Sources Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China China State Railway Group Co. Ltd.Beijing 100844China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China Railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing 100081China

The intrusion of obstacles onto railway tracks presents a significant threat to train safety,characterized by sudden and unpredictable *** China leading the world in high-speed rail mileage,ensuring railway security is *** current laser monitoring technologies suffer from high false alarm rates and unreliable intrusion *** study addresses these issues by investigating high-resolution laser monitoring technology for railway obstacles,focusing on key parameters such as monitoring range and *** propose an enhanced non-uniform laser scanning method,developing a laser monitoring system that reduces the obstacle false alarm rate to 2.00%,significantly lower than the 20%standard(TJ/GW135-2015).This rate is the best record for laser monitoring systems on China *** system operates seamlessly in all weather conditions,providing superior accuracy,resolution,and identification *** is the only 3D LiDAR system certified by the China State Railway Group Co.,Ltd.(Certificate No.[2023]008).Over three years,our system has been deployed at numerous points along various lines managed by the China State Railway Group,accumulating a dataset of 300,000 *** extensive deployment has significantly enhanced railway *** development and implementation of our railway laser monitoring system represent a substantial advancement in railway safety *** low false alarm rate(2.00%),high accuracy(20 cm×20 cm×20 cm),and robust performance in diverse conditions underscore its potential for widespread adoption,promising to enhance railway safety in China and internationally.

关键词： Laser monitoring technology Non-uniform laser scanning method False alarm rate Railway safety

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国外木材碎料搭拱特性的研究进展

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木材加工机械 2014年第5期25卷 56-57,18页

作者：闫承琳中国林科院林业新技术研究所北京100091 国家林业局北京林业机械研究所北京100029

主要介绍了国外搭拱理论、木材碎料等生物质材料搭拱特性测试方法及实验装置的研究及开发进展,对木材碎料搭拱原因进行了总结。

关键词：木材碎料搭拱生物质材料搭拱测试装置搭拱原因

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Catalytic production of high-energy-density spiro polycyclic jet fuel with biomass derivatives

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Journal of Energy Chemistry 2025年第2期101卷 760-768页

作者： Wen-Jing Zhang yan-cheng Hu yan-Hong Tan Jia Li Ning Li Jing-Pei Cao School of Chemical Engineering and Technology China University of Mining and Technology CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences

High-energy-density（HED） fuel（*** used JP-10 and RJ-4）,featuring compact 3D polycyclic structure with high strain,is of critical importance for volume-limited military aircraft,since their high density and combustion heat can provide more propulsion *** reduce the reliance on petroleum source,it is highly desirable to develop renewable alternatives for the production of strained polycyclic HED fuel,but which remains a big challenge because of the inaccessibility caused by the high strain,We herein demonstrate a three-step catalytic route towards highly strained C17and C18spirofuel with biomass *** process includes catalytic aldol condensation of renewable cyclohexanone/cyclopentanone with benzaldehyde,catalytic spiro Diels-Alder（D-A） reaction of aldol adduct with isoprene,and catalytic *** key spiro D-A reaction is enabled by the catalysis of heterogeneous Lewis acidic ionic *** chloroaluminate IL,formed by benign urea and AICl3,exhibits good catalytic performance and reusability for this *** eventual hydrodeoxygenation（HDO）over Pd/C and H-Y produces strained tricyclic spirofuel with density>0.93 g/mL,combustion heat>41 MJ/L and freezing point <-40℃,which are better than the properties of tactical fuel ***,it is anticipated that the as-prepared renewable fuels have the potential to replace traditional petroleum-derived HED fuels.

关键词： Biomass derivatives Cycloaddition High-energy-density Lewis acidic ionic liquid Spiro polycyclic fuel

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Remaining Life Prediction Method for Photovoltaic Modules Based on Two-Stage Wiener Process

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Energy Engineering 2025年第1期122卷 331-347页

作者： Jie lin Hongchi Shen Tingting Pei yan Wu School of Electrical Engineering and Information Engineering Lanzhou University of TechnologyLanzhou730050China

Photovoltaic (PV) modules, as essential components of solar power generation systems, significantly influence unitpower generation *** service life of these modules directly affects these costs. Over time, the performanceof PV modules gradually declines due to internal degradation and external environmental *** cumulativedegradation impacts the overall reliability of photovoltaic power generation. This study addresses the complexdegradation process of PV modules by developing a two-stage Wiener process model. This approach accountsfor the distinct phases of degradation resulting from module aging and environmental influences. A powerdegradation model based on the two-stage Wiener process is constructed to describe individual differences inmodule degradation processes. To estimate the model parameters, a combination of the Expectation-Maximization(EM) algorithm and the Bayesian method is employed. Furthermore, the Schwarz Information Criterion (SIC) isutilized to identify critical change points in PV module degradation trajectories. To validate the universality andeffectiveness of the proposed method, a comparative analysis is conducted against other established life predictiontechniques for PV modules.

关键词： Photovoltaic modules degradation stochastic processes lifetime prediction

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Magnetically-responsive phase change thermal storage materials:Mechanisms,advances,and beyond

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Journal of Energy Chemistry 2025年第2期101卷 485-510页

作者： yan Gao yang Li Jinjie lin Panpan Liu Xiao Chen Ge Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Function Materials for Molecule & Structure Construction School of Materials Science and Engineering University of Science and Technology Beijing School of Physics and Astronomy Beijing Normal University Shunde Graduate School University of Science and Technology Beijing

Rapid advances in thermal management technology and the increasing need for multi-energy conversion have placed stringent energy efficiency requirements on next-generation shape-stable composite phase change materials(PCMs).Magnetically-responsive phase change thermal storage materials are considered an emerging concept for energy storage systems,enabling PCMs to perform unprecedented functions(such as green energy utilization,magnetic thermotherapy,drug release,etc.).The combination of multifunctional magnetic nanomaterials and PCMs is a milestone in the creation of advanced multifunctional composite ***,a timely and comprehensive review of composite PCMs based on magnetic nanoparticle modification is still ***,we furnish an exhaustive exposition elucidating the cutting-edge advancements in magnetically responsive composite *** delve deeply into the multifarious roles assumed by distinct nanoparticles within composite PCMs of varying dimensions,meticulously scrutinizing the intricate interplay between their architectures and thermophysical ***,we prognosticate future research trajectories,delineate alternative stratagems,and illuminate prospective *** review is intended to stimulate broader academic interest in interdisciplinary fields and provide valuable insights into the development of next-generation magnetically-responsive composite PCMs.

关键词： Magnetic nanoparticles Magnetic-thermal conversion Phase change materials Response mechanism Thermal energy storage

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太赫兹折叠波导慢波结构的设计与微加工(英文)

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红外与毫米波学报 2014年第1期33卷 62-67页

作者：王亚军陈樟程焰林施志贵中国工程物理研究院电子工程研究所四川绵阳621900 中国工程物理研究院太赫兹研究中心四川绵阳621900

从行波管工作的物理特性提出了一种获得折叠波导慢波结构参数的简单方法,给定工作频率和电压,能够获得折叠波导慢波结构的初始参数.设计了D波段的折叠波导结构来验证该方法,对其冷测特性如色散、耦合阻抗进行了分析.仿真结果表明,设计... 详细信息

从行波管工作的物理特性提出了一种获得折叠波导慢波结构参数的简单方法,给定工作频率和电压,能够获得折叠波导慢波结构的初始参数.设计了D波段的折叠波导结构来验证该方法,对其冷测特性如色散、耦合阻抗进行了分析.仿真结果表明,设计的折叠波导慢波结构在中心频率处具有较平缓的色散关系,在中心频率处耦合阻抗为3.5欧姆.在电子注电压为20.6 kV,电流为15 mA时,27 mm（50个周期）的折叠波导慢波结构在220 GHz具有13.5 dB的增益,3 dB带宽为11 GHz （213 ～224 GHz）.同时讨论了折叠波导慢波结构的微加工工艺,并通过UV-LIGA工艺获得了实验样品.

关键词：行波管折叠波导仿真 THz辐射

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Positron annihilation study of defect formation and evolution in matrix graphite under He ion irradiation

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Nuclear Science and Techniques 2025年第1期36卷 13-21页

作者： Hong-Xia Xu Jian-Dang Liu Bang-Jiao Ye Zi-Wen Pan Jun lin Jin-Liang Song Jian-Qing Cao Chao yan Ying-Ping Hao Jin-Xing cheng Qing-Bo Wang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai 200025China Beijing Institute of High Technology Beijing 100094China

The stability of matrix graphite under neutron irradiation and in corrosive environments is crucial for the safe operation of molten salt reactors(MSRs).Raman spectroscopy and a slow positron beam were employed to investigate the effects of He ion irradiation fluences and subsequent annealing on the microstructure and defects of the matrix *** ions with 500 keV energy and fluences ranging from 1.1×10^(15)ions∕cm^(2)to 3.5×10^(17)ions∕cm^(2)were used to simulate neutron irradiation at 300 *** samples with an irradiation fluence of 3.5×10^(16)ions∕cm^(2)were subjected to isochronal annealing at different temperatures(573 K,873 K and 1173 K)for 3 *** Raman results revealed that the D peak gradually increased,whereas the intrinsic G peak decreased with increasing irradiation *** the same irradiation fluence,the D peak gradually decreased,whereas the intrinsic G peak increased with increasing annealing *** positron beam analysis demonstrated that the density or size of irradiation defects(vacancy type)increased with higher irradiation fluence,but decreased rapidly with increasing annealing *** Raman spectral analysis of sample cross sections subjected to high irradiation fluences revealed the emergence of amorphization precisely at the depth where ion damage was most pronounced,whereas the surface retained its crystalline *** and positron annihilation analyses indicated that the matrix graphite exhibited good irradiation resistance to He ions at 300 ***,vacancy-type defects induced by He ion irradiation exhibit poor thermal stability and can be easily removed during annealing.

关键词： Graphite Positron annihilation Irradiation Raman spectrum

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短穗竹上一种异香柱菌的形态学及分子鉴定

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北京林业大学学报 2009年第1期31卷 84-90页

作者：程燕林侯成林高健首都师范大学生命科学学院国际竹藤网络中心国家林业局竹藤科学与技术重点开放实验室

竹丛枝病可由多种病原引起,竹生香柱菌即是其中的一类,包括箣竹香柱菌(Epichloё bambusae)和箬竹香柱菌(Epichloё sasae)两种。日本学者Tanaka根据形态结合分子的研究结果,将其更名为箣竹异香柱菌(Heteroepichloё bambusae)和箬竹异... 详细信息

竹丛枝病可由多种病原引起,竹生香柱菌即是其中的一类,包括箣竹香柱菌(Epichloё bambusae)和箬竹香柱菌(Epichloё sasae)两种。日本学者Tanaka根据形态结合分子的研究结果,将其更名为箣竹异香柱菌(Heteroepichloё bambusae)和箬竹异香柱菌(Heteroepichloё sasae)。该文作者于2007年5月底从安徽省广德县的短穗竹上采集到1种异香柱型丛枝病标本,对其病原菌的形态学和培养特征进行观察描述,并利用ITS rDNA序列对其系统发育学进行分析,最终确定该菌为箬竹异香柱菌,而不是先前认为的箣竹异香柱菌。鉴于国内有关其他寄主上的竹生异香柱菌的描述模糊,并且绘图非常简单,因此建议对我国竹生的异香柱菌形态学和寄主范围进行研究,特别是利用分子生物学手段确定它们的分类学地位。

关键词：短穗竹丛枝病竹异香柱菌系统发育分析

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Enhanced oxygen reduction reaction on La-Fe bimetal in porous N-doped carbon dodecahedra with CNTs wrapping

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Chinese Chemical Letters 2025年第1期36卷 618-622页

作者： Yi Zhou yanzhen Liu yani yan Zonglin Yi Yongfeng Li cheng-Meng Chen College of Biomedical Engineering Taiyuan University of TechnologyTaiyuan 030024China CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China College of Materials Sciences and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China

The oxygen reduction reaction(ORR)is a crucial process in Zn-air systems,and the catalyst plays a significant role in this ***,reported catalysts often suffer from poor durability and stability during the ORR ***,we synthesized La-Fe bimetallic nanoparticles encapsulated in a N-doped porous carbon dodecahedron(La-Fe/NC)originated from ZIF-8 by a simple direct *** La-Fe/NC catalyst had a numerous mesopores and dendritic outer layer generated by carbon nanotubes(CNTs),forming a high conductivity network that helped to optimize electron transfer and mass transport in the ORR *** effect of different doping transition metals and metal ratios on the ORR activity of Zn-air batteries was *** alkaline media,the La-Fe/NC showed the highest ORR catalytic activity,with a half-wave potential(E_(1/2))of 0.879 V(***,Pt/C 0.845 V).After 5000 cycles,the E_(1/2)of the La-Fe/NC catalyst only decreased by 7 m V,and its performance in stability tests and methanol tolerance tests was superior to Pt/*** used as the air electrode in a Zn-air battery,the La-Fe/NC catalyst demonstrated an excellent specific capacity of 755 m Ah/g and a peak power density of179.8 m W/cm~*** results provide important insights for the development of high-performance Zn-air batteries and new directions for the design of ORR catalysts.

关键词： Electrocatalyst ORR Bimetallic nanoparticle Dendritic CNTs Zn-air battery

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