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Particulate matter pollution in Kunshan High-Tech zone： Source apportionment with trace elements, plume evolution and its monitoring

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Journal of Environmental Sciences 2018年第9期30卷 119-126页

作者： Suwei Zhang Qijie Zhang Armand Albergel Didier Buty Liangmin Yu Haiting Wang Wuxia Bi Peng Cheng Fu Chen Jun Fang Ruirui Hou Xudong Luan changgan shu Jingjing Su Jiangsu Skyray Instrument Co. Ltd. Kunshan 215300 China ARIA Technologies SA Boulogne-Billancourt 92100 France Kunshan Environment Monitoring Station Kunshan 215300 China State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and Engineering Nankai University Tianjin 300000 China Center for Urban Transport Emission Research College of Environmental Science and Engineering Nankai University Tianjin 300000 China Ecole Nationale Superieure des Mines de Douai Douai France Kinton Environmental Technology Co. Ltd. Nanjing 210000 China Chengdu University of Information Science and Technology Chengdu 610000 China Hohai Uniuersity Nanjing 210000 China

Particulate matter （PM} in the Kunshan High-Tech zone is studied during a three-month campaign. PM and trace elements are measured by the online pollution monitoring, forecast-warning and source term retrieval system AS3. Hourly measured concentrations of PM10, PM2.5 and 16 trace elements in the PM2.5 section （Ca, Pb, Cu, C1, V, Cr, Fe, Ti, Mn, Ni, Zn, Ga, As, Se, Sr, Ba） are focused. Source apportionment of trace elements by Positive Matrix Factorization modeling indicates that there are five major sources, including dust, industrial processing, traffic, combustion, and sea salt with contribution rate of 23.68%, 21.66%, 14.30%, 22.03%, and 6.89%, respectively. Prediction ofptume dispersion from concrete plant and traffic emissions shows that PM20 pollution of concrete plant is three orders of magnitude more than that of the traffic. The influence range can extend to more than 3 km in 1 hr. Because the footprint of the industrial plumes is constantly moving according to the local meteorological conditions, the fixed monitoring sites scattered in a few hundred meters haven＇t captured the heaviest pollution plume at the local scale of a few km2. As a more intensive monitoring network is not operationally possible, the use of online modeling gives accurate and quantitative information of plume location, which increases the spatial pollution monitoring capacity and improves the understanding of measurement data. These results indicate that the development of the AS3 system, which combines monitoring equipment and air pollution modeling systems, is beneficial to the real-time pollution monitoring in the industrial zone.

关键词： Particulate matter pollution Trace elements Online pollution monitoring in a industrial zone Source apportionment Plume evolution

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Effect of Boundary Scattering on Magneto-Transport Performance in BN-Encapsulated Graphene

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Chinese Physics Letters 2022年第9期39卷 57-61页

作者： Lijun Zhu Lin Li Xiaodong Fan Zhongniu Xie changgan Zeng CAS Key Laboratory of Strongly Coupled Quantum Matter Physics and Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China International Center for Quantum Design of Functional Materials(ICQD) Hefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

For conductors in the ballistic regime, electron-boundary scattering at the sample edge plays a dominant role in determining the transport performance, giving rise to many intriguing phenomena like low-field negative magnetoresistance effect. We systematically investigate the magneto-transport behaviors of BN-encapsulated graphene devices with narrow channel width W, wherein the bulk mean free path Lmfp can be very large and highly tunable. By comparing the magnetoresistance features and the amplitude of Lmfp in a large parameter space of temperature and carrier density, we reveal that the boundary-scattering-dominated negative magnetoresistance effect can still survive even when the ballistic ratio(Lmfp/W) is as low as 0.15. This striking value is much smaller than the expected value for achieving(quasi-) ballistic transport regime(Lmfp/W ≥ 1), and can be attributed to the ultra-low specularity of the sample edge of our graphene devices. These findings enrich our understanding of the effects of boundary scattering on channel transport, which is of vital importance for future designs of two-dimensional electronic devices with limited lateral sizes.

关键词： transport scattering boundary

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In situ growth of NiSe_(2) nanocrystalline array on graphene for efficient hydrogen evolution reaction

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Frontiers in Energy 2022年第4期16卷 595-600页

作者： shuai JI changgan LAI Huan ZHOU Helin WANG Ling MA Cong WANG Keying ZHANG Fajun LI Lixu LEI School of Chemistry and Chemical Engineering Southeast UniversityNanjing 211189China School of Chemistry and Chemical Engineering Suzhou UniversitySuzhou 234000China Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China

Nickel selenide electrocatalysts for hydrogen evolution reaction(HER)with a high efficiency and a lowcost have a significant potential in the development of water ***,the inferiority of the high overpotential and poor stability restricts their practical ***,a composite nanostructure consists of ultrasmall NiSe_(2) nanocrystals embedded on graphene by microwave reaction is *** prepared NiSe_(2)/reduced graphite oxide(rGO)electrocatalyst exhibited a high HER activity with an overpotential of 158 mV at a current density of 10 mA/cm^(2) and a corresponding moderate Tafel slope of 56 mV/dec in alkaline *** addition,a high retention of electrochemical properties(approximately 100%)was demonstrated with an unchangeable microstructure after 100 h of continuous operation.

关键词： nickel selenide carbon materials nanoparticles hydrogen evolution reaction(HER) microwave reaction

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Three-dimensional carbon framework as high-proportion sulfur host for high-performance lithium-sulfur batteries

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Journal of Materials Science & Technology 2020年第13期47卷 84-91页

作者： Xianbin Liu Zechen Xiao changgan Lai shuai Zou Ming Zhang Kaixi Liu Yanhong Yin Tongxiang Liang Ziping Wu School of Materials Science and Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

Lithium-sulfur(Li-S)batteries are anticipated as one of the most promising candidates for the highenergy-density storage ***,the insulating nature and shuttling effect of sulfur severely limits their *** incorporation of sulfur with carbon materials has been deemed as one of the most powerful strategies to improve electrical conductivity and suppress soluble polysulfide ***,a novel three-dimensional carbon framework(3DCF)is prepared and employed as a sulfur host(3DCF@S)for Li-S *** 3DCF not only supplies abundant paths for lithium ion diffusion and electron transport,but also strengthens polysulfide immobilization during the lithium/sulfur conversion *** a result,the 3DCF@S with high sulfur content of 90%exhibits a high capacity of 1366 mA h/g at 0.1 C and excellent cycling stability with a satisfactory capacity of 601 mA h/g after 600 cycles at 2.0 *** resultant Li-S button battery based 3DCF@S electrode could power a light-emitting diode for 2 *** acquired 3DCF@S is expected to be widely used in Li-S batteries and this study will promote developments of carbon/sulfur composites for Li-S batteries.

关键词： 3D carbon framework High sulfur proportion Lithium-sulfur battery High capacity Outstanding cycling stability

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DYNAMIC FRACTURE TOUGHNESS OF ULTRASTRENGTH STEELS FOR AIRCRAFT

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Acta Metallurgica Sinica(English Letters) 1991年第3期4卷 209-213页

作者： XU changgan ZENG Zhongping Beijing University of Aeronautics and Astronautics,Beijing,China

The plots of load vs deflection(P-D)for two ultra-strength steels 30CrMnSiNi2A and 300M has been examined on a Charpy impact tester with digital memory and microcomputer. A criterion was found to availably represent the dynamic fracture toughness,K_(Ic)~D ,of the steels under impact *** K_(Ic)~D,.can be calculated with suggesting that the turning point of change in compliance on the P-D plot is the point of destabilized crack *** K_(Ic)~D of steel 300M,quenched at 870℃ ,separately tempered at 300℃ and 450℃,was esti- mated to be 55—70 MN/m^(3/2)and 54—67 MN/m^(3/2)*** K_(Ic)calculated with accuracy about 20% seems to be available to the engineering evaluation.

关键词： ultra-strength steel impact toughness dynamic fracture toughness

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On the Conceptualizing of Traditional Festival Experiences with Photo-elicitation Interviews in China

On the Conceptualizing of Traditional Festival Experiences w...

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作者： LI Jing FANG changgan South China University of Technology Business School Wuzhou University

Although tourism experiences have always been hot topics in tourism researches,festival experiences cover a wide range of types with scattered and rare *** Guangzhou Spring Festival Flower Fair as an example, the authors of this paper collect the original data by using the method of photo-elicitation instead of the traditional interview, and systematically study the dimensional experiences from the perspective of traditional tourism festivals, according to the qualitative research and analysis method of the grounded theory. This research confirms six dimensions of festival experiences, including social activities, culture, aesthetic appreciation, participation, novel and emotional experiences. Novel experiences could be a new dimension of traditional festivals among them. It is important to note that novelty experiences look for innovation, which should be based on festival culture and traditional culture. At the same time, the authors establish a theoretical framework of traditional tourism festival experiences, which indicates that cultural experiences can promote the generation of novel experiences through aesthetic appreciation, social activities and participation, while emotional experiences run through tourism activities. This paper may theoretically enrich the study of festival experiences by providing theoretical reference for festival management and marketing.

关键词： Traditional Festival Tourism Experience Photo Elicitation Guangzhou Spring Festival Flower Fair

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ELECTROCHEMICAL BEHAVIOUR OF PHASES IN TITANIUM ALLOYS

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Acta Metallurgica Sinica(English Letters) 1990年第7期3卷 33-37页

作者： LIU Ping Institute of Aeronautical Material,Beijing,ChinaXU changgan Beijing University of Aeronautics and Astronautics,Beijing,China XU changgan,Associate Professor,Group 102,Beijing University of Aeronautics and Astronautics,37 Xueyuan Road,Beijing 100083,China

The electrochemical behaviour,which is presented by means of anodic polarization *** the component phases in Ti and Ti alloys in aqueous solutions of fluorhydrie acid,chhnhydric acid and amber acid has been *** results indicate that the electrochemical behaviour of the allloys depends upon the composition and the lattice *** corrosion of x and x′phase in actire region and that of β phase in passive region are the dominant corrosion behaviour.

关键词： Ti alloy electrochemical behaviour polarization curve

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表演性视角下民族节日旅游“主—客”展演互动研究——以广西三江侗族多耶节为例

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广西民族研究 2017年第4期 78-86页

作者：方昌敢梧州学院

民族节日作为重要的旅游吸引物,在民族地区旅游中发挥重要作用。在节日旅游中,东道主往往用表演的形式将本民族的文化进行呈现。而游客在凝视表演文化的过程中,也通过参与表演来获得身体化的表演体验。文章以广西三江侗族多耶节为研究案... 详细信息

民族节日作为重要的旅游吸引物,在民族地区旅游中发挥重要作用。在节日旅游中,东道主往往用表演的形式将本民族的文化进行呈现。而游客在凝视表演文化的过程中,也通过参与表演来获得身体化的表演体验。文章以广西三江侗族多耶节为研究案例,以节日活动中的表演行为为切入点,以节日空间中东道主和游客为研究对象,探讨在民族节日旅游展演的背景下,东道主和游客的表演性是如何在"客-我"的互动中进行建构的。研究发现,在民族节日旅游中,东道主作为节日旅游的"主人",为了更好地展示本民族的文化,发挥其旅游经济及社会功能,往往通过编排或排练使民族文化富于表演性,从而使其更好地在旅游舞台上进行呈现,发挥交流媒介的功能;另一方面,游客作为节日旅游场域中的"客人",其在通过视觉的凝视对东道主所表演的文化进行消费的过程中,已不单纯地满足于视觉感官的体验,更多的在于追求身体的多感官体验,进行旅游的身体化实践和表演性参与。

关键词：凝视展演认同表演性节日旅游

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