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Evaluating the performance and influencing factors of three portable black carbon monitors for field measurement

Journal of Environmental Sciences 2024年第5期139卷 320-333页

作者： Liqing Wu Yicheng Shen Fei Che yuzhe zhang Jian Gao Chong Wang State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Jinan Ecological Environmental Protection Grid-Based Supervision Center Jinan 250013China

Black carbon(BC)is associated with adverse human health and climate *** BC spatial distribution imperatively requires low-cost and portable *** portable BC monitors are commercially available,but their accuracy and reliability are not always satisfactory during continuous field *** study evaluated three models of portable black carbon monitors,C12,MA350 and DST,and investigates the factors that affect their *** monitors were tested in urban Beijing,where portable devices running for one month alongside a regular-size reference aethalometer *** study considers several factors that could influence the monitors'performance,including ambient weather,aerosol composition,loading artifacts,and built-in *** results show that MA350and DST present considerable discrepancies to the reference instrument,mainly occurring at lower concentrations(0-500 ng/m^(3))and higher concentrations(2500-8000 ng/m^(3)),*** discrepancies were likely caused by the anomalous noise of MA350 and the loading artifacts of *** study also suggests that the ambient environment has limited influence on the monitors'performance,but loading artifacts and accompanying compensation algorithms can result in unrealistic *** on the evaluation,the study suggests that C12 is the best choice for unsupervised field measurement,DST should be used in scenarios where frequent maintenance is available,and MA350 is suitable for research purposes with post-processing *** study highlights the importance of assigning portable BC monitors to appropriate applications and the need for optimized real-time compensation algorithms.

关键词： Black carbon Aethalometer Loading artifact Performance evaluation Portable device

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A universal performance-enhancing method for Li-S batteries:the cathode material of Li_(2)S@Li_(2)S_(2)@Li_(2)S_(6) double-shell structure

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Science China Chemistry 2024年第4期67卷 1229-1241页

作者： Shunjin Yang Yujiang Sun Qiaran zhang Xiaohu Hu Xing Chen Guoran Li Xiao Sun yuzhe zhang Shijie Xu Xinyu Wang Yongan Yang Institute of Molecular Plus School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China College of Materials Science and Engineering Nankai UniversityTianjin 300350China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Tianjin Key Laboratory of Advanced Carbon and Electrochemical Energy Storage Tianjin 300072China

Lithium sulfide(Li_(2)S)as a cathode material for lithium-sulfur(Li-S)batteries,one of the most promising advanced batteries in the future,has received tremendous attention in the past ***,developing the practical Li_(2)S cathode confronts challenges of low conductivity for Li-ions and electrons,high sensitivity to environmental moisture,big overpotential barrier to electrochemical activation,and poor cyclability due to the shuttle effect of intermediate *** article herein reports a simple and effective strategy for making Li_(2)S@Li_(2)S_(2)@Li_(2)S_(6) double-shelled microparticles,which can significantly mitigate these *** are synthesized by dissolving Li2S together with S in dimethoxyethane,then drying off the solvent,and finally calcining the collected *** with pure Li_(2)S,such a double-shell material presents a 26.7% improvement in cycling capacity,0.5 V lower in activation overpotential,and prolonged tolerance in the ambient *** density functional theory calculation shows that the performance enhancement lies in the higher stability of Li2S6in contact with moisture and some autocatalytic effect of Li_(2)S_(2)@Li_(2)S_(6).Such a double-shell structure becomes a universal performanceenhancing approach when being combined with other means,such as cathodes composited with catalytic MoS_(2),separators modified with selenium-doped sulfurized-polyacrylonitrile/montmorillonite,electrolytes containing fluorenone additive,and Li anodes coated with a layer of Li_(3)*** corresponding capacity retention shows up to 80%improvement compared with pure Li_(2)S.

关键词： lithium-sulfur batteries lithium sulfide lithium polysulfides cathode performance double shell structure

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Fluorine-Doped High-Performance Li_(6)PS_(5)Cl Electrolyte by Lithium Fluoride Nanoparticles for All-Solid-State Lithium-Metal Batteries

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Transactions of Tianjin University 2024年第3期30卷 250-261页

作者： Xiaorou Cao Shijie Xu yuzhe zhang Xiaohu Hu Yifan Yan Yanru Wang Haoran Qian Jiakai Wang Haolong Chang Fangyi Cheng Yongan Yang Institute of Molecular Plus School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

All-solid-state lithium-metal batteries(ASSLMBs)are widely considered as the ultimately advanced lithium batteries owing to their improved energy density and enhanced safety *** various solid electrolytes,sulfide solid electrolyte(SSE)Li_(6)PS_(5)Cl has garnered significant ***,its application is limited by its poor cyclability and low critical current density(CCD).In this study,we introduce a novel approach to enhance the performance of Li_(6)PS_(5)Cl by doping it with fluorine,using lithium fluoride nanoparticles(LiFs)as the doping *** F-doped electrolyte Li_(6)PS_(5)Cl-0.2LiF(nano)shows a doubled CCD,from 0.5 to 1.0 mA/cm^(2) without compromising the ionic conductivity;in fact,conductivity is enhanced from 2.82 to 3.30 mS/cm,contrary to the typical performance decline seen in conventionally doped Li_(6)PS_(5)Cl *** symmetric Li|SSE|Li cells,the lifetime of Li_(6)PS_(5)Cl-0.2LiF(nano)is 4 times longer than that of Li_(6)PS_(5)Cl,achieving 1500 h vs.371 h under a charging/discharging current density of 0.2 mA/cm^(2).In Li|SSE|LiNbO_(3)@NCM721 full cells,which are tested under a cycling rate of 0.1 C at 30℃,the lifetime of Li_(6)PS_(5)Cl-0.2LiF(nano)is four times that of Li_(6)PS_(5)Cl,reaching 100 cycles vs.26 ***,the doping of nano-LiF off ers a promising approach to developing high-performance Li_(6)PS_(5)Cl for ASSLMBs.

关键词： Sulfide solid electrolyte All-solid-state lithium batteries Li_(6)PS_(5)Cl Lithium fluoride F-doping

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AMPK:多样性调控机制与疾病治疗新视角

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中国比较医学杂志 2024年第2期34卷 167-178页

作者：宁静华张鑫张钰哲大理大学基础医学院云南大理671000 云南抗病原药用植物筛选重点实验室云南大理671000 云南省昆虫生物医药重点实验室云南大理671000

单磷酸腺苷激活的蛋白激酶(AMP-activated protein kinase,AMPK)是一种保守的细胞能量感受器,在调控细胞生长、增殖、分化、自噬、磷酸化、串扰以及葡萄糖和脂质代谢等方面起着重要作用,当机体能量匮乏或某些极端情况时AMPK被激活,而在... 详细信息

单磷酸腺苷激活的蛋白激酶(AMP-activated protein kinase,AMPK)是一种保守的细胞能量感受器,在调控细胞生长、增殖、分化、自噬、磷酸化、串扰以及葡萄糖和脂质代谢等方面起着重要作用,当机体能量匮乏或某些极端情况时AMPK被激活,而在营养过剩时被抑制,以维持能量平衡。此外,AMPK信号通路介导铁死亡发生的调控机制也体现了其独特作用,AMPK在不同细胞器里发挥特殊调控功能为疾病治疗提供了新的方向。这也是预防疾病的治疗靶标,如生殖系统疾病、衰老、癌症、炎症和心脏功能障碍等。该文综述了细胞能量不平衡对机体微环境造成的损害,AMPK通过多样性信号调控机制激发了其在疾病和药物中的潜在治疗潜力,为不同系统疾病提供了治疗新思路。通过综述AMPK信号通路的多样性调节机制,为靶向AMPK的癌症治疗和其他疾病的治疗提供理论参考。

关键词：单磷酸腺苷激活的蛋白激酶能量代谢铁死亡信号传导治疗靶标

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高速齿轮两相流场及喷油润滑特性分析

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机械传动 2024年第7期48卷 1-8页

作者：侍东张钰哲张红侯祥颖南京工诺科技有限公司江苏南京211215 南京航空航天大学机电学院江苏南京210016

高速齿轮箱内的复杂流场通过影响齿轮喷油润滑特性,进而影响传动系统的传动效率和工作性能。针对高速齿轮箱复杂流场及挡板结构带来的影响等问题,开展了高速齿轮喷油两相流场及润滑特性研究。基于计算流体力学方法,建立高速斜齿轮喷油... 详细信息

高速齿轮箱内的复杂流场通过影响齿轮喷油润滑特性,进而影响传动系统的传动效率和工作性能。针对高速齿轮箱复杂流场及挡板结构带来的影响等问题,开展了高速齿轮喷油两相流场及润滑特性研究。基于计算流体力学方法,建立高速斜齿轮喷油润滑两相流场分析模型,分析了两相流场分布特性;在此基础上,研究了喷油参数(如喷油速度、喷油夹角、轴向角度)以及齿轮挡板对喷油润滑特性的影响规律。结果表明,高速斜齿轮喷油润滑时,表面油液有偏斜现象;通过提高喷油速度或增加正轴向角度,可以改善油液偏斜现象,提高润滑效果;齿轮挡板对油液起着导流作用,其中,设置轴向挡板有利于增加齿面的油液。为高速齿轮箱两相流场分布特性研究及喷油润滑优化设计提供了依据。

关键词：高速齿轮喷油润滑计算流体力学齿轮挡板

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Innovation and Practice of Training Mode for Professional Postgraduates of Acupuncture and Tuina Based on Artificial Intelligence

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Asian Agricultural Research 2024年第3期16卷 46-48页

作者： Mingjun LIU Xiaochao GANG Zhengri CONG Junhao HU Jianfeng LIANG Chongwen ZHONG Xinyi YUAN Bing DAI yuzhe zhang Lijie LI Tianyi MU Yiran HAN Chaochao HUA College of Acupuncture and Tuina Changchun University of Chinese MedicineChangchun 130117China The Third Affiliated Hospital of Changchun University of Chinese Medicine Changchun 130117China College of Special Education Changchun UniversityChangchun 130022China Department of Orthopaedics Pingyang BranchChangchun Hospital of Traditional Chinese MedicineChangchun 130000China

In view of the common problems of integrating artificial intelligence into the training of postgraduates in Acupuncture and Tuina major,this paper reviews the related research progress both at home and *** puts forward the innovative reform paths for integrating artificial intelligence into postgraduate training mode of Acupuncture and Tuina major:construct the teaching staff of artificial intelligence graduate students;innovating artificial intelligence to promote the integration of classics and scientific research;constructing the ideological and political case base of artificial intelligence courses;implementing artificial intelligence platform blended teaching;building a domestic and foreign exchange platform for artificial *** practical research in teaching,it has achieved good teaching results and played a good demonstration,leading and radiation role in similar majors in China.

关键词： Artificial intelligence (AI) Acupuncture and Tuina major Professional postgraduates Training mode

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新能源汽车企业间信用风险传染效应研究——基于新能源汽车产业供应链

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财务与金融 2024年第3期39卷 11-21页

作者：张钰哲李程香港理工大学应用数学系中国香港999077 天津工业大学经济与管理学院天津300387

近年来,新能源汽车产业供应链体系发展迅速,其供应链金融模式中信用风险的预防和管控是确保新能源汽车企业平稳发展的关键。选取新能源汽车产业供应链中五家代表性企业,利用KMV模型计算新能源汽车产业供应链上下游这五家企业的违约概率... 详细信息

近年来,新能源汽车产业供应链体系发展迅速,其供应链金融模式中信用风险的预防和管控是确保新能源汽车企业平稳发展的关键。选取新能源汽车产业供应链中五家代表性企业,利用KMV模型计算新能源汽车产业供应链上下游这五家企业的违约概率衡量其各自的信用风险,并利用Vine Copula模型构建这五家企业间的风险相依结构,探究企业间的风险传染效应。研究表明:新能源汽车产业供应链上下游企业间存在信用风险传染,且主要集中在中上游企业。同时,宏观环境的冲击会进一步引发新能源汽车产业供应链中企业间信用风险的传染。因此,监管层应特别关注新能源汽车产业供应链中下游企业之间信用风险的传染效应,避免形成供应链系统性风险。此外,政府应加强对新能源汽车行业的监管,防范供应链金融风险;企业间要加强供应链网络的构建,提升企业核心竞争力,以便更好地应对宏观环境的冲击,防范信用风险的形成与传染。

关键词：新能源汽车供应链金融信用风险传染企业集团

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五重孪晶铜纳米线@聚吡咯制备及其电催化硝酸盐还原制氨

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化工学报 2024年第4期75卷 1519-1532页

作者：严孝清赵瑛张宇哲欧鸿辉黄起中胡华贵杨贵东西安交通大学化学工程与技术学院陕西西安710049 国能榆林化工有限公司陕西榆林719000

合理设计高活性、高选择性、高稳定性、低成本纳米结构催化剂是电催化硝酸根还原制氨的一个重大挑战。采用水热法耦合原位还原法制备了厚度可控的聚吡咯包裹五重孪晶铜纳米线催化剂,实现了低偏压下产氨活性、法拉第效率的提高以及对抗... 详细信息

合理设计高活性、高选择性、高稳定性、低成本纳米结构催化剂是电催化硝酸根还原制氨的一个重大挑战。采用水热法耦合原位还原法制备了厚度可控的聚吡咯包裹五重孪晶铜纳米线催化剂,实现了低偏压下产氨活性、法拉第效率的提高以及对抗腐蚀能力的大幅提升。偏压为-0.4 V(可逆氢电极)时T-CuNW-10样品合成氨活性达到13.83 mg·mg^(-1)·h^(-1),偏压-0.7 V(可逆氢电极)时达到23.24 mg·mg^(-1)·h^(-1);中间产物亚硝酸根与产物氨二者加和的法拉第效率(FE)接近100%;腐蚀电流降低至3.14 mA·cm^(-2)。最终实现催化剂高效稳定硝酸根还原制氨性能的提升,可为开发设计工业应用催化剂提供思路参考。

关键词：聚吡咯五重孪晶铜纳米材料硝酸根电化学合成氨催化剂

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经前庭沟切口的骨膜下隧道技术在牙龈退缩治疗中的应用

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中华口腔医学研究杂志（电子版） 2024年第3期18卷 143-149,F0004页

作者：刘佳瑞张宇喆宁杨中山大学附属口腔医院光华口腔医学院广东省口腔医学重点实验室广东省口腔疾病临床医学研究中心广州510055

牙龈退缩作为常见口腔病损,可影响患者牙齿美观和引起功能障碍。临床上有多种治疗牙龈退缩的膜龈手术,近年来一种新的微创术式--经前庭沟切口的骨膜下隧道技术(VISTA)因其根面覆盖率高、术后美学效果好等优点得到日益广泛的应用。临床... 详细信息

牙龈退缩作为常见口腔病损,可影响患者牙齿美观和引起功能障碍。临床上有多种治疗牙龈退缩的膜龈手术,近年来一种新的微创术式--经前庭沟切口的骨膜下隧道技术(VISTA)因其根面覆盖率高、术后美学效果好等优点得到日益广泛的应用。临床研究表明,VISTA技术的应用可以使牙龈退缩深度和宽度减少,角化龈增加,且患者术后反应较轻,美学评分较高。本文介绍了VISTA技术的演变史、优势、适应证、手术步骤和相关临床疗效评估,以期促进VISTA技术在牙龈退缩治疗中的应用。

关键词：经前庭沟切口的骨膜下隧道技术牙龈退缩微创根面覆盖

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Hydrogeochemical characterization and quality assessment of groundwater using self-organizing maps in the Hangjinqi gasfield area,Ordos Basin,NW China

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Geoscience Frontiers 2021年第2期12卷 781-790页

作者： Chu Wu Chen Fang Xiong Wu Ge Zhu yuzhe zhang Department of Water Resources China Institute of Water Resources and Hydropower ResearchBeijing 100083China School of Water Resources and Environment China University of Geosciences(Beijing)Beijing 100083China Center for Advanced Technology and Education(CATE) Florida International UniversityMiamiFL 33174USA

Water resources are scarce in arid or semiarid areas,which not only limits economic development,but also threatens the survival of *** local communities around the Hangjinqi gasfield depend on groundwater sources for water supply.A clear understanding of the groundwater hydrogeochemical characteristics and the groundwater quality and its seasonal cycle is invaluable and indispensable for groundwater protection and *** this study,self-organizing maps were used in combination with the quantization and topographic errors and K-means clustering method to investigate groundwater chemistry *** Piper and Gibbs diagrams and saturation index were systematically applied to investigate the hydrogeochemical characteristics of groundwater from both rainy and dry ***,the entropy-weighted theory was used to characterize groundwater quality and assess its seasonal variability and suitability for drinking *** hydrochemical groundwater dataset,consisting of 10 parameters measured during both dry and rainy seasons,was classified into 6 clusters,and the Piper diagram revealed three hydrochemical facies:Cl-Na type(clusters 1,2 and 3),mixed type(clusters 4 and 5),and HCO3-Ca type(cluster 6).The Gibbs diagram and saturation index suggested thatweathering of rock-forming mineralswere the primary process controlling groundwater chemical composition and validated the credibility and practicality of the clustering ***-thirds of 45 groundwater samples were categorized as excellent-or good-quality and were suitable as drinking *** changes within the same and different clusters from the dry season to the rainy season were detected in approximately 78%of the collected *** main factors affecting the groundwater quality were hydrogeochemical characteristics,and dry season groundwater quality was better than rainy season groundwater *** on this work,such results can be used to investigate the seasonal variation of hy

关键词： Self-organizing maps Seasonal change Entropy-weighted theory Hydrogeochemical characteristics Groundwater quality

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