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Species profile and reactivity of volatile organic compounds emission in solvent uses,industry activities and from vehicular tunnels

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Journal of Environmental Sciences 2024年第1期135卷 546-559页

作者： Haimei Huang zhangwei Wang Chunhao Dai Hai Wu Jia Guo chunjie Wang Xiaoshan zhang State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Hunan Agricultural University Changsha 430106China National Institute of Metrology Beijing 100029China

A survey was conducted of the volatile organic compounds(VOCs)released from sources of solvent use,industry activities and vehicle emissions in Guiyang,a capital city of China.Samples were collected by canisters and analyzed by GC-MS-FID.The species profiles of VOCs emitted from sources were obtained.Results showed that xylenes,ethylbenzene,acetone and dichloromethane were the characteristics species for painting,2-propanol and ethyl acetate for printing,α-pinene for solid wood furniture manufacturing,and 2-butanone for biscuit baking.These characteristics species could be as tracers for the sources respectively.In most of samples from the solvent use,the benzene/toluene(B/T)ratio was less than 0.3,indicating that the ratio could be as the indicator for tracing the solvent use related sources.The results also suggested that the toluene/xylene(T/X)ratio be as the indicator to distinguish the VOCs sources of painting(2).Aromatics contributed the most to ozone formation potential(OFP)of most painting and non-paper printing sources,and oxygen-containing VOCs(OVOCs)were major species contributing to OFP of the sources from food production and paper printing.The OFP of the VOCs emissions from vehicle in tunnels and from other manufactures were dominated by both aromatics and alkenes.Theα-pinene could explain 56.94%and 32.54%of total OFP of the VOCs sources from filing cabinet and solid wood furniture manufacturing,which was rarely been involved in previous studies of VOCs source profiles,indicating that the species of concern for VOCs sources are still insufficient at present.

关键词： Volatile organic compounds(VOCs) Species profile BTEX ratio Source reactivity

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Towards high-strength cold spray additive manufactured metals:Methods,mechanisms,and properties

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Journal of Materials Science & Technology 2024年第3期170卷 47-64页

作者： Shuo Yin Ningsong Fan chunjie Huang Yingchun Xie Chao zhang Rocco Lupoi Wenya Li Department of Mechanical Manufacturing&Biomedical EngineeringParsons BuildingTrinity College DublinThe University of DublinDublin 2Ireland Institute of Materials Technology Helmut-Schmidt-University/University of the Federal Armed Forces HamburgHamburg 22043Germany The Key Lab of Guangdong for Modern Surface Engineering Technology National Engineering Laboratory for Modern Materials Surface Engineering TechnologyInstitute of New MaterialsGuangdong Academy of SciencesGuangzhou 510651China College of Mechanical Engineering Yangzhou UniversityYangzhou 225127China State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi’an 720072China

Cold spray,as a solid-state additive manufacturing process,has been attracting increasing attention from both scientific and industrial communities.However,cold-sprayed deposits generally have unfavorable mechanical properties in their as-fabricated state compared to conventionally manufactured and fusion-based additive-manufactured counterparts due to the inherent microstructural defects in the deposits(e.g.,porosity and incomplete interparticle bonding).This downside reduces its competitiveness and limits its wide applications as an additive manufacturing process.In the past years,many strengthening technologies have been developed or introduced to adjust the microstructure and improve the mechanical properties of cold-sprayed deposits.The term“strengthening”in this work specifically refers to improving the mechanical strength,particularly the tensile strength of the cold-sprayed bulk deposits.According to the stage that the strengthening technologies are used in the cold spray process,they can be classified into three categories:pre-process(e.g.,powder heat treatment),in-process(e.g.,powder heating,in-situ micro-forging,laser-assisted cold spray),and post-process(e.g.,post heat treatment,hot isostatic pressing,hot rolling,friction stir processing).Therefore,a comprehensive review of these strengthening technolo-gies is conducted to illuminate the possible correlations between the strengthening mechanisms and the resultant deposit microstructures and mechanical properties.This review paper aims to help researchers and engineers well understand the different strengthening methods and provide guidance for the cold spray community to develop new strengthening strategies for future high-quality mass production.

关键词： Cold spray Additive manufacturing Strengthening Microstructure Ductility Tensile strength

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PRI modulation recognition and sequence search under small sample prerequisite

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Journal of Systems Engineering and Electronics 2023年第3期34卷 706-713页

作者： zhang chunjie LIU Yuchen SI Weijian College of Information and Communication Engineering Harbin Engineering UniversityHarbin 150001China Key Laboratory of Advanced Marine Communication and Information Technology Ministry of Industry and Information TechnologyHarbin Engineering UniversityHarbin 150001China

Pulse repetition interval(PRI)modulation recognition and pulse sequence search are significant for effective electronic support measures.In modern electromagnetic environments,different types of inter-pulse slide radars are highly confusing.There are few available training samples in practical situations,which leads to a low recognition accuracy and poor search effect of the pulse sequence.In this paper,an approach based on bi-directional long short-term memory(BiLSTM)networks and the temporal correlation algorithm for PRI modulation recognition and sequence search under the small sample prerequisite is proposed.The simulation results demonstrate that the proposed algorithm can recognize unilinear,bilinear,sawtooth,and sinusoidal PRI modulation types with 91.43% accuracy and complete the pulse sequence search with 30% missing pulses and 50% spurious pulses under the small sample prerequisite.

关键词： inter-pulse slide pulse repetition interval(PRI)modulation type bi-directional long short-term memory(BiLSTM)network sequence search

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Biomass-derived porous carbon with single-atomic cobalt toward high-performance aqueous zinc-sulfur batteries at room temperature

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Journal of Energy Chemistry 2024年第8期95卷 325-335页

作者： Shenfei Zhao Xiaoshuai Wu Jiliang zhang chunjie Li Zixiang Cui Weihua Hu Ruguang Ma Changming Li Institute for Clean Energy & Advanced Materials School of Materials & Energy Southwest University Institute for Materials Science and Devices School of Materials Science and Engineering Suzhou University of Science and Technology School of Materials Science and Engineering Dalian Jiaotong University

Aqueous zinc-sulfur batteries at room temperature hold great potential for next-generation energy storage technology due to their low cost, safety and high energy density. However, slow reaction kinetics and high activation energy at the sulfur cathode pose great challenges for the practical applications. Herein,biomass-derived carbon with single-atomic cobalt sites（MMPC-Co） is synthesized as the cathode in Zn-S batteries. The catalysis of single-atom Co sites greatly promotes the transform of cathode electrolyte interface（CEI） on the cathode surface, while offering accelerated charge transfer rate for high conversion reversibility and large electrochemical surface area（ECSA） for high electrocatalytic current. Furthermore,the rich pore structure not only physically limits sulfur loss, but also accelerates the transport of zinc ions.In addition, the large pore volume of MMPC-Co is able to relieve the stress effect caused by the volume expansion of Zn S during charge/discharge cycles, thereby maintaining the stability of electrode structure.Consequently, the sulfur cathode maintains a high specific capacity of 729.96 m A h g-1after 500 cycles at4 A g-1, which is much better than most cathode materials reported in the literature. This work provides new insights into the design and development of room-temperature aqueous Zn-S batteries.

关键词： Aqueous zinc-sulfur batteries Biomass-derived carbon Rich pore structure Single-atom catalysts Sulfur cathode

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The Combination of Achnatherum inebrians Extracts and Soil Microorganisms Inhibited Seed Germination and Seedling Growth in Elymus nutans

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Phyton-International Journal of Experimental Botany 2024年第3期93卷 567-580页

作者： Rui zhang Taixiang Chen Zhenjiang Chen Hao Chen Xuekai Wei Malik Kamran chunjie Li State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems Key Laboratory of Animal Husbandry InnovationMinistry of Agriculture and Rural AffairsEngineering Research Center of Grassland AgricultureMinistry of EducationWest Gansu Province Prataculture Technology Innovation CenterCollege of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou730020China Center for Grassland Research National Forestry and Grassland AdministrationCaFBeijing100091China

In a greenhouse experiment,the effects of soil microorganisms and extracts of Achnatherum inebrians on the seed germination and seedling growth of Elymus nutans were studied.The results showed that both the extracts from aboveground and belowground parts of A.inebrians signiﬁcantly inhibited the germination rate,germination potential,germination index,vigor index,seedling height,root length,and fresh weight of E.nutans,but increased malondialdehyde content,catalase,peroxidase and superoxide dismutase activity of E.nutans seedlings(p<0.05).The allelopathy of aqueous extracts of the aboveground parts of A.inebrians was stronger than that of the pre-cipitates.Aqueous extracts of the aboveground parts of A.inebrians decreased seed germination rate,germination potential,germination index,vigor index,seedling length,root length,and seedling fresh weight by 10.45%-74.63%,24.18%-32.50%,19.03%-73.36%,37.83%-88.41%,21.42%-53.14%,2.65%-40.21%,and 20.45%-61.36%,respectively,and malondialdehyde content,peroxidase,catalase,and superoxide dismutase activity increased by 8.09%-62.24%,27.83%-86.47%,22.90%-93.17%,and 11.15%-75.91%,respectively.The above indexes were higher in live soil than in sterilized soil.Soil microorganisms increased the allelopathy of A.inebrians.The seed germination rate,germination potential,germination index,vigor index,seedling length,and seedling fresh weight of E.nutans planted in live soil decreased by 8.22%-48.48%,10.00%-51.85%,8.19%-53.26%,16.43%-60.03%,12.91%-28.81%,and 9.09%-22.86%compared with sterilized soil,respectively.Malondialdehyde content,peroxidase,catalase,and superoxide dismutase activity of E.nutans planted in live soil increased by 53.91%-81.06%,15.71%-57.34%,33.33%-86.31%,and 9.78%-52.51%compared with sterilized soil,respectively.The existence of soil microorganisms enhanced the allelopathy of the secondary metabolites of A.inebrians.A combination of microorganisms and aqueous extracts from the aboveground parts of A.inebrians had the strongest allelopathic effect on E.nutans.

关键词： Achnatherum inebrians water immersion liquid aqueous leachate precipitate allelopathy Elymus nutans soil microorganisms

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Self-fueling ferroptosis-inducing microreactors based on p H-responsive Lipiodol Pickering emulsions enable transarterial ferro-embolization therapy

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National Science Review 2024年第1期11卷 74-85页

作者： chunjie Wang Lei zhang Zhijuan Yang Dongxu Zhao Zheng Deng Jialu Xu Yumin Wu Yu Hao Ziliang Dong Liangzhu Feng Zhuang Liu Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Center of Interventional Radiology & Vascular Surgery Department of Radiology Zhongda Hospital Medical School Southeast University Department of Interventional Radiology The First Afflliated Hospital of Soochow University

Lipiodol chemotherapeutic emulsions remain one of the main choices for the treatment of unresectable hepatocellular carcinoma(HCC) via transarterial chemoembolization(TACE). However, the limited stability of Lipiodol chemotherapeutic emulsions would lead to rapid drug diffusion, which would reduce the therapeutic benefit and cause systemic toxicity of administrated chemotherapeutics. Therefore, the development of enhanced Lipiodol-based formulations is of great significance to enable effective and safe TACE treatment. Herein, a stable water-in-oil Lipiodol Pickering emulsion(LPE) stabilized by pH-dissociable calcium carbonate nanoparticles and hemin is prepared and utilized for efficient encapsulation of lipoxygenase(LOX). The obtained LOX-loaded CaCO3&hemin-stabilized LPE(LHCa-LPE) showing greatly improved emulsion stability could work as a pH-responsive and self-fueling microreactor to convert polyunsaturated fatty acids(PUFAs), a main component of Lipiodol, to cytotoxic lipid radicals through the cascading catalytic reaction driven by LOX and hemin, thus inducing ferroptosis of cancer cells. As a result, such LHCa-LPE upon transcatheter embolization can effectively suppress the progression of orthotopic N1S1 HCC in rats. This study highlights a concise strategy to prepare pH-responsive and stable LPE-based self-fueling microreactors, which could serve as bifunctional embolic and ferroptosis-inducing agents to enable proof-of-concept transarterial ferro-embolization therapy of HCC.

关键词： CaCO3 nanoparticles Pickering emulsion ferroptosis lipid peroxidation transarterial ferro-embolization

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Overcoming genotypic dependency and bypassing immature embryos in wheat transformation by using morphogenic regulators

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Science China(Life Sciences) 2024年第7期67卷 1535-1538页

作者： Ziru Zhou Yawen Yang Guo Ai Miaomiao Zhao Baozhu Han chunjie Zhao Yiqian Chen Yuwei zhang Hong Pan Caixia Lan Chao He Qiang Li Jieting Xu Wenhao Yan National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhan 430070China WIMI Biotechnology Co. Ltd.Changzhou 213025China

Dear Editor,Agrobacterium-mediated transformation technology is of vital importance for functional genomics studies and precision breeding in crops due to low cost and clear genetic manifestation.A morphogenic gene pa... 详细信息

关键词： breeding crops transformation

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Modulation space estimates for damped fractional wave equation

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Science China Mathematics 2016年第4期59卷 687-696页

作者： zhang chunjie zhang YuHuai REN FangFang Department of Mathematics Hangzhou Dianzi University

Instead of the L^p estimates,we study the modulation space estimates for the solution to the damped wave equation.Decay properties for both the linear and semilinear equations are obtained.The estimates in modulation ... 详细信息

关键词：阻尼波动方程 P空间估计调制半线性方程分数衰减特性

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Calibration and Application of Actual Tension of Low Precision 20 High Mill

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International Journal of Plant Engineering and Management 2022年第4期27卷 214-231页

作者： zhang chunjie SONG Zheng TONG Jianjia MO Zhiying Tinplate Business Department of Shougang Jingtang Iron and Steel United Co. Ltd.Tangshan 063200HebeiChina Steel Rolling Operation Department of Shougang Jingtang Iron and Steel United Co. Ltd.Tangshan 063200HebeiChina

The rolling production of metal thin strips,especially the production of stainless steel and copper thin strips with high yield strength,due to the limitation of the minimum rolling thickness,multi roll mills with small working roll diameter are mostly used,and the 20 roll mill is the most common.Aiming at the problem that the actual tension of some 20 high rolling mills with long service time and low assembly accuracy has a large deviation from the set tension and is not accurate enough,this paper first designs the tension calibration device of the low precision 20 high rolling mill.Secondly,the calibration principle of the tension calibration device designed in this paper is described.Then,according to the calibration principle and specific implementation scheme,the actual tension tact of the strip steel is comprehensively determined,and the mapping relationship between the set tension tset and the actual tension tact of the 20 high mill is established,so as to improve the tension control accuracy of the 20 high mill and ensure the shape quality of the strip steel.

关键词： tension calibration device calibration principle implementation plan actual tension

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基于纯自注意力机制的毫米波雷达手势识别

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系统工程与电子技术 2024年第3期46卷 859-867页

作者：张春杰王冠博陈奇邓志安哈尔滨工程大学信息与通信工程学院黑龙江哈尔滨150001 先进船舶通信与信息技术工业和信息化部重点实验室黑龙江哈尔滨150001

在构建智慧控制,万物互联的背景下,通过手势远程控制设备,进行人机交互逐渐成为研究热点。对此,提出了一种以毫米波雷达为传感器,采用基于纯自注意力机制模型实现手势识别的方法。首先,采集正面视角的13类手势的时序回波数据。接着,对... 详细信息

在构建智慧控制,万物互联的背景下,通过手势远程控制设备,进行人机交互逐渐成为研究热点。对此,提出了一种以毫米波雷达为传感器,采用基于纯自注意力机制模型实现手势识别的方法。首先,采集正面视角的13类手势的时序回波数据。接着,对数据进行三维快速傅里叶变换(three-dimension fast Fourier transform,3D-FFT)、动目标显示(moving target indication,MTI)、恒虚警率(constant false alarm rate,CFAR)检测操作并进行固定种类特征提取,将这些特征传入基于纯自注意力机制网络的雷达特征变换(radar feature transformer,RFT)网络。最后,基于实测数据完成了数据特征提取、网络训练、手势识别等步骤。实验结果表明,所提方法在测试集上准确率达到95.38%,网络训练时间短,模型复杂度低,泛化性好,为现有研究提供了新的研究思路。

关键词：毫米波雷达手势识别自注意力机制噪声抑制

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