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Effects of CeO_(2)pre-calcined at different temperatures on the performance of Pt/CeO_(2)-C electrocatalyst for methanol oxidation reaction

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International Journal of Minerals,Metallurgy and Materials 2021年第7期28卷 1224-1232页

作者： Guo-qing Li Pu-kang Wen Chen-qiang Gao Tian-yi Zhang Jun-yang Hu Yu-hao Zhang Shi-you guan Qing-feng Li Bing Li school of mechanical and power engineering East China University of Science and TechnologyShanghai 200237China school of Materials science and engineering East China University of Science and TechnologyShanghai 200237China Institute for Sustainable Energy College of SciencesShanghai UniversityShanghai 200237China Department of Energy Conversion and Storage Technical University of DenmarkLyngby 2800Denmark

Pt/CeO_(2)-C catalysts with CeO_(2)pre-calcined at 300-600 ℃were synthesized by combining hydrothermal calcination and wet *** effects of the pre-calcined CeO_(2)on the performance of Pt/CeO_(2)-C catalysts in methanol oxidation were *** Pt/CeO_(2)-C catalysts with pre-calcined CeO_(2)at 300-600 ℃showed an average particle size of 2.6-2.9 nm and exhibited better methanol elec-tro-oxidation catalytic activity than the commercial Pt/C *** specific,the Pt/CeO_(2)-C catalysts with pre-calcined CeO_(2)at 400 ℃dis-played the highest electrochemical surface area value of 68.14 m2·g−1 and If/Ib ratio(the ratio of the forward scanning peak current density(If)and the backward scanning peak current density(Ib))of 1.26,which are considerably larger than those(53.23 m2·g−1 and 0.79,respectively)of the commercial Pt/C catalyst,implying greatly enhanced CO tolerance.

关键词： direct methanol fuel cell platinum/cerium dioxide-carbon electrocatalyst methanol oxidation

Intercalation modification of FeOCl and its application in dye wastewater treatment

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Chinese Chemical Letters 2021年第8期32卷 2503-2508页

作者： Jiaqiang wu Yanfang Liu Xuejing Yang Jinling Wang Jie Yang school of Energy and power engineering University of Shanghai for Science and TechnologyShanghai 200093China school of mechanical and power engineering East China University of Science and TechnologyShanghai 200237China Centre for Environmental sciences Hasselt UniversityMartelarenlaan 42Hasselt 3500Belgium

The textile industry spreads globally with the challenges of its wastewater treatment,especially dyes,which are difficult to *** improve coagulation-flocculation process in dye wastewater treatment,an intercalation process was employed to prepare a new efficient coagulant of lithium borohydride-iron oxychloride(LiBH_(4)_FeOCl) in this *** layered crystal pristine iron oxychloride(FeOCl) material was prepared by chemical gas phase ***4 was introduced into the layers of two dimensional(2 D) FeOCl nanosheets by a simple method of liquid phase *** samples were characterized by a field emitting scanning electron microscopy(SEM),a rotating anode X-ray powder diffractometer(XRD),*** cationic dye was employed as the simulated pollutant.A coagulation and decolorization experimental device was built to study the coagulation performance of the new coagulant LiBH_(4)_*** is found that the intercalation modified LiBH_(4)_FeOCl exhibits the characteristics of crystal structure,and the layered structure of FeOCl is ***_(4)_FeOCl,as an insoluble inorganic solid coagulant,performs well for dye pollutants of methyl red,basic yellow 1,methylene blue,rhodamine B,ethyl violet and Janus green *** reaction rate is significantly 68% higher than the current commercial coagulants of Al_(2)(SO_(4))_(3).The mechanism analysis reveals that LiBH_(4)_FeOCl breaks and disperses rapidly in the water *** negatively charged material particles can be electrostatically adsorbed with dye pollutant molecules through electrostatic *** above collaborative actions of breaking,dispersion and electrostatic adsorption are the main coagulation mechanisms of LiBH_(4)_*** solid inorganic coagulant of LiBH4FeOCl provides a competitive alternative for traditional inorganic salts and organic coagulants.

关键词： FeOCl Intercalation modification Coagulation Dye wastewater treatment Ion selectivity

Global cavitation patterns and corresponding hydrodynamics of the hydrofoil with leading edge roughness

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Acta Mechanica Sinica 2020年第6期36卷 1202-1214,I0001页

作者： Qian Chen Yunqing Liu Qin wu Yong Wang Taotao Liu Guoyu Wang school of mechanical engineering Beijing Institute of Technology100081BeijingChina Research Center of Fluid Machinery engineering and technology Jiangsu University212013JiangsuChina

The objective of this paper is to experimentally investigate the cavitation patterns and corresponding hydrodynamics of the hydrofoil with leading edge *** aims are to(1)understand the effect of the leading edge roughness on the hydrodynamic performance,and(2)have a good knowledge of the interaction between the leading edge roughness and the cavitation *** results are indicated for the NACA 66 hydrofoils with and without leading edge roughness at different incidence angles for sub and cavitation *** experiments are conducted in the EPFL high-speed cavitation tunnel(Avellan 2015).The results showed that the leading edge roughness has a significant effect on the hydrodynamic performance at the sub cavitation,suppressing the formation of the incipient *** lift coefficient of the hydrofoil without leading edge roughness is larger than that of the hydrofoil with leading edge roughness,while for the drag coefficients,the results are contrary for the lift coefficient,and the maximum lift-to-drag ratio angle is delayed for the hydrofoil with leading edge *** leading edge roughness modified the local pressure distribution at the leading edge region,which in turn significantly increased the minimum pressure coefficient,hence the incipient cavitation number of the hydrofoil with leading edge *** formation and evolution of the transient cavity for the cloud cavitation is little affected by the leading edge roughness.

关键词： Cavitation Hydrofoil Hydrodynamics Leading edge roughness

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单质铋调控碳缺陷氮化碳光催化降解罗丹明B

材料科学与工艺 2024年第5期32卷 1-11页

作者：石姝彤郑帅叶小兰谢亮吴隽玮孙鑫格曾玉彬武汉大学动力与机械学院武汉430072 中油(新疆)石油工程有限公司新疆克拉玛依834000 武汉理工大学材料科学与工程学院武汉430072 中国石油工程建设公司西南分公司成都610000

为提升石墨相氮化碳(CN)的光催化性能,利用缺陷工程策略在CN中引入碳空位后,再采用化学还原法制备了单质铋负载的碳缺陷氮化碳(Bi-V-CN),分别采用XRD、SEM、XRD、FTIR、XPS、PL、EIS等检测方法进行了表征分析,并将其应用于罗丹明B(RhB)... 详细信息

为提升石墨相氮化碳(CN)的光催化性能,利用缺陷工程策略在CN中引入碳空位后,再采用化学还原法制备了单质铋负载的碳缺陷氮化碳(Bi-V-CN),分别采用XRD、SEM、XRD、FTIR、XPS、PL、EIS等检测方法进行了表征分析,并将其应用于罗丹明B(RhB)的光催化降解。研究结果表明,单质铋的引入显著提升了催化剂的可见光响应性能,且在合成时引入硝酸铋的质量分数为0.5%、催化剂质量浓度为1mg/mL、RhB初始质量浓度为20mg/L时,光照25min后,催化剂对RhB的去除率达到99.7%。单质铋和碳缺陷的引入不仅增加了CN的比表面积,为催化反应提供了更多的活性位点,同时还减小了CN的禁带宽度,促进了光生电子和空穴的有效分离,从而达到提升材料光催化活性的目的。活性物种淬灭实验结果表明,h^(+)和·O_(2)^(-)是Bi-V-CN在光催化降解RhB过程中的主要活性物种。

关键词：氮化碳铋负载碳缺陷光催化罗丹明B

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脉冲真空渗透预处理改善热泵干燥罗非鱼片品质

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农业工程学报 2017年第23期33卷 306-314页

作者：李敏关志强吴阳阳刘岩叶彪广东海洋大学机械与动力工程学院湛江524088

为了获得脉冲真空浸渍预处理条件对热泵干燥罗非鱼片品质的影响,以白度、脱水效率指数(DEI,dehydration efficiency index,)、Ca2+-ATPase活性、复水率和质构为检测指标,结合综合评分,进行了以循环率(真空维持时间/常压维持时间)、循环... 详细信息

为了获得脉冲真空浸渍预处理条件对热泵干燥罗非鱼片品质的影响,以白度、脱水效率指数(DEI,dehydration efficiency index,)、Ca2+-ATPase活性、复水率和质构为检测指标,结合综合评分,进行了以循环率(真空维持时间/常压维持时间)、循环次数、真空压力和海藻糖浓度为预处理变化条件下单因素影响的系列试验。结果表明:在其他条件不变的情况下,每个单因素均有一个使干燥品质达到最佳的因素范围和最佳值。循环率在4∶4~5∶1min/min之间变化时,其综合品质较好,且以循环率为4∶2min/min时,综合评分达到最高。循环次数在3~5之间变化时,其综合品质与对照组相比提升幅度较高,且循环次数为4时,综合评分最高。脉冲真空压力在4~16 kPa之间变化时,对热泵干燥罗非鱼片的综合品质的提升效果较好,且真空压力为10 kPa时,综合评分最高。海藻糖质量浓度在90~170 g/L的范围内变化时,综合品质的提升效果较好,且海藻糖质量浓度在130 g/L时综合评分值最高。与常压渗透对照组相比,各品质指标都得到了不同程度的提升,各指标达到的最大升幅分别为:白度17.9%,复水率80%,Ca2+-ATPase活性93.6%,差异显著(P<0.05)。脉冲真空条件下的浸渍预处理可以有效提升热泵干燥罗非片的综合品质,研究结果为改善同类产品干燥的预处理工艺提供参考。

关键词：干燥品质控制压力脉冲真空浸渍热泵罗非鱼片综合评价

An automated approach to calculating the maximum diameters of multiple cutters and their paths for sectional milling of centrifugal impellers on a 4_(1/2)-axis CNC machine

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Chinese Journal of Aeronautics 2019年第4期32卷 1030-1039页

作者： Baohai wu Zezhong C.CHEN Ming LUO Dinghua ZHANG Feiyan HAN school of mechanical engineering Northwestern Polytechnical University Department of mechanical Industrial and Aerospace EngineeringConcordia University College of mechanical engineering Xi'an University of Science and Technology

power generators and chemical engineering compressors include heavy and large centrifugal impellers. To produce these impellers in high-speed machining, a 4?-axis milling machine(or a 4-axis machine plus an indexing table) is often used in the industry, which is more rigid than a5-axis milling machine. Since impeller blades are designed with complex B-spline surfaces and impeller channels spaces vary significantly, it is more efficient to use multiple cutters as large as possible to cut a channel in sections and a blade surface in patches, instead of only using a small cutter to machine a whole blade and a channel. Unfortunately, no approach has been established to automatically calculate the largest diameters of cutters and their paths, which include the indexing table angles. To address this problem, an automated and optimization approach is proposed. Based on the structure of a 4?-axis machine, a geometric model for a cutter gouging/interfering the impeller is formulated, and an optimization model of the cutter diameter in terms of the indexing table angle is established at a cutter contact(CC) point on a blade surface. Then, the diameters of the tools,their orientations, and the indexing table angles are optimized, and each tool's paths are generated for machining its corresponding impeller section. As a test, an impeller is efficiently machined with these tools section by section; thus, this approach is valid. It can be directly used in the industry to improve efficiency of machining centrifugal impellers.

关键词： Automated path generation 4_(1/2)-Axis CNC machining Centrifugal impeller machining Cutter diameter optimization Sectional machining

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基于再热的两级闪蒸地热发电系统优化

太阳能学报 2018年第9期39卷 2486-2492页

作者：李亚张伟吴方之柴永志华北电力大学可再生能源学院北京102206 低品位能源多相流动与传热北京市重点实验室华北电力大学北京102206 华北电力大学能源动力与机械工程学院北京102206 西藏地热发电工程研究中心北京100086

为提高汽轮机的排汽干度，针对肯尼亚奥卡瑞地区某固定冷热源参数的地热资源，提出分别采用高压汽水分离器所分离蒸汽及分离热水作为再热源的两级闪蒸系统，以两级汽轮机的总输出功为目标函数，排汽干度高于0．88为约束条件，对再热蒸... 详细信息

为提高汽轮机的排汽干度，针对肯尼亚奥卡瑞地区某固定冷热源参数的地热资源，提出分别采用高压汽水分离器所分离蒸汽及分离热水作为再热源的两级闪蒸系统，以两级汽轮机的总输出功为目标函数，排汽干度高于0．88为约束条件，对再热蒸汽的抽汽比、二级闪蒸压强和再热器的效能等参数进行优化计算。结果表明，与常规的两级闪蒸扩容系统相比，采用分离蒸汽和高温热水进行再热后，机组的最大输出功可分别提高22．16％和24．18％，为高效地热电站的系统设计提供新思路。

关键词：地热电站再热循环能效比抽汽

地方应用型高校现代产业学院人才培养模式研究——以菏泽学院为例

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菏泽学院学报 2024年第4期46卷 39-44页

作者：李振武李鑫李黎明菏泽学院机电工程学院山东菏泽274015 国网菏泽供电公司山东菏泽274000 山东现代学院马克思主义学院山东济南250104

现代产业学院是国家为培养高素质应用型、复合型、创新型人才,而建设的新型多功能人才培养实体。近年来产业学院建设虽取得较大成效,但也面临一些问题。菏泽学院坚持“德育为先、育人为本、产业为要、产教融合、创新发展”产业学院建设... 详细信息

现代产业学院是国家为培养高素质应用型、复合型、创新型人才,而建设的新型多功能人才培养实体。近年来产业学院建设虽取得较大成效,但也面临一些问题。菏泽学院坚持“德育为先、育人为本、产业为要、产教融合、创新发展”产业学院建设原则,立足山东省“十强产业”需求,以人才培养模式创新作为产业学院建设关键,通过借鉴德国“双元制”“双跨”人才培养机制,提出了“一目标二重点三层次四机制五保障”“12345”多元互融人才培养模式,大力培养产业急需高素质人才,以期能为兄弟院校卓越人才培养提供参考。

关键词：现代产业学院人才培养模式产教融合实践创新

Toward high-efficiency perovskite solar cells with one-dimensional oriented nanostructured electron transport materials

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Journal of Energy Chemistry 2023年第7期82卷 66-87,I0003页

作者： Yinhua Lv Bing Cai Ruihan Yuan Yihui wu Quinn Qiao Wen-Hua Zhang Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies School of Materials and EnergyYunnan UniversityKunming 650500YunnanChina school of Chemical engineering Sichuan UniversityChengdu 610065SichuanChina Sichuan Research Center of New Materials Institute of Chemical MaterialsChina Academy of Engineering PhysicsChengdu 610200SichuanChina mechanical and Aerospace engineering Syracuse UniversitySyracuseNew York 13244USA Yunnan university and Southwest United Graduate school Kunming 650500YunnanChina

The unique advantages of one-dimensional(1D)oriented nanostructures in light-trapping and chargetransport make them competitive candidates in photovoltaic(PV)*** the emergence of perovskite solar cells(PSCs),1D nanostructured electron transport materials(ETMs)have drawn tremendous ***,the power conversion efficiencies(PCEs)of these devices have always significantly lagged behind their mesoscopic and planar ***-efficiency PSCs with 1D ETMs showing efficiency over 22%were just realized in the most recent *** yet lacks a comprehensive review covering the development of 1D ETMs and their application in *** hence timely summarize the advances in 1D ETMs-based solar cells,emphasizing on the fundamental and optimization issues of charge separation and collection ability,and their influence on PV *** sketching the classification and requirements for high-efficiency 1D nanostructured solar cells,we highlight the applicability of 1D TiO_(2)nanostructures in PSCs,including nanotubes,nanorods,nanocones,and nanopyramids,and carefully analyze how the electrostatic field affects cell *** kinds of oriented nanostructures,e.g.,ZnO and SnO_(2)ETMs,are also ***,we discuss the challenges and propose some potential strategies to further boost device *** review provides a broad range of valuable work in this fast-developing field,which we hope will stimulate research enthusiasm to push PSCs to an unprecedented level.

关键词： 1D nanostructures Perovskite solar cells Electron transport materials Electrostatic field High-efficiency