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考虑源荷协同的水风光一体化多时间尺度优化调度研究

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水电与抽水蓄能 2024年第2期10卷 78-85,120页

作者：朱天生李大成庞锋项华伟杨建赞龚兰强中国电建集团贵阳勘测设计研究院有限公司贵州省贵阳市550081

以大规模、高比例新能源为主体的新型电力系统背景下,为解决中长期、短期水风光互补系统的电力质量、源荷协同矛盾的问题,本文提出了一种考虑不同时间尺度下水风光互补目标的水库优化调度决策,可实现不同时间尺度下的水风光一体化优化调... 详细信息

以大规模、高比例新能源为主体的新型电力系统背景下,为解决中长期、短期水风光互补系统的电力质量、源荷协同矛盾的问题,本文提出了一种考虑不同时间尺度下水风光互补目标的水库优化调度决策,可实现不同时间尺度下的水风光一体化优化调度,指导水风光一体化系统的全周期运行过程。首先,从水风光一体化互补基本原理层面,阐述水风光一体化互补的机理、原则以及具体方法;其次,提出基于多时间尺度的以送电量为主、适应受端负荷的水风光互补调度多目标函数,构建水风光中长期—短期优化调度的多层嵌套调度模型,引入分层联合解耦、区间二分搜索算法求解;最后,通过不同时间尺度的水风光一体化场景与受端负荷特性确定边界,结合多目标函数构建水电中长期、短期优化调度方案。研究结果表明:利用水电灵活调节性能可有效提升中长期、短期水风光互补发电质量效益,同时增加对受端电力系统负荷的适应性。本次研究成果对水风光一体化系统的调度运行指导提供一定的经验借鉴和参考。

关键词：源荷协同水风光互补多时间尺度优化调度

催化剂中Rh含量对NH_(3)及N_(2)O生成量影响研究

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河南化工 2024年第7期41卷 8-12页

作者：李大成刘志敏杨兰刘世成王燕孙创中自环保科技股份有限公司四川成都611731

研究了不同Rh含量的三效催化剂对CO和NO_(x)的起燃性能,并对反应过程中副产物NH_(3)以及N_(2)O的生成规律进行研究。实验通过浸渍法制备得到不同Rh含量的Rh-Pd/Ce_(x)Zr_(1-x)O_(2)+La-Al_(2)O_(3)催化剂,采用一套专用多路固定床连续流... 详细信息

研究了不同Rh含量的三效催化剂对CO和NO_(x)的起燃性能,并对反应过程中副产物NH_(3)以及N_(2)O的生成规律进行研究。实验通过浸渍法制备得到不同Rh含量的Rh-Pd/Ce_(x)Zr_(1-x)O_(2)+La-Al_(2)O_(3)催化剂,采用一套专用多路固定床连续流动模拟气反应器对其性能进行评价。研究结果表明:不同Rh负载量表现出不同的N_(2)选择性,随着Rh用量的增加NO_(x)的转化性能提升。总体来看,低Rh用量的催化剂产生更多的N_(2)O和NH_(3)副产物,而随着Rh用量的增加其N_(2)选择性也增加。当温度达到400℃时,Rh用量≥0.141 g/L的催化剂基本没有N_(2)O生成,Rh用量≥0.283 g/L基本没有N_(2)O和NH_(3)生成。该研究对于优化三效催化剂中Rh配比以提升N_(2)选择性具有借鉴意义,并对于设计满足未来国Ⅶ排放标准的三效催化剂具有重要的指导意义。

关键词：三效催化剂 Rh用量 NH_(3)生成 N_(2)O生成 N_(2)选择性

Dynamic modeling framework for solid-gas sorption systems

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Energy Storage and Saving 2023年第3期2卷 522-531页

作者： dacheng li Tiejun Lu Nan Hua Yi Wang lifang Zheng Yi Jin Yulong Ding Yongliang li Birmingham Centre for Energy Storage School of Chemical EngineeringUniversity of BirminghamEdgbastonB152TTUK School of Mechanical Engineering University of Science and TechnologyBeijing100083China Jiangsu Jinhe Energy Technology Co. LtdNo.1Sci&Tech AvenueEconomic and Technological Development ZoneJurongJiangsuChina

A dynamic modeling framework based on an intelligent approach is proposed to identify the complex behaviors of solid-gas sorption *** experimental system was built and tested to assist in developing a model of the system performance during the adsorption and desorption *** variations in the thermal effects and gaseous environment accompanying the reactions were considered when designing the *** optimization platform based on a multi-population genetic algorithm and artificial criteria was established to identify the mod-eling coefficients and quantify the effects of condition changes on the *** calibration of the simulation results against the tested data showed good accuracy,where the coefficient of determination was greater than *** outcome of this study could provide a modeling basis for the optimization of solid-gas sorption systems and contribute a potential tool for uncovering key characteristics associated with materials and components.

关键词： Solid-gas sorption Dynamic modeling Intelligent optimization Coefficient identification

Laser Measuring System Used for Large Workpiece Diameter

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Chinese Journal of Lasers 1996年第1期B5卷 94-96页

作者： ZHANG Jianmin WANG Jia li dacheng CAO Mang ZHAO Yang(Department of Precision Instruments,Tsinghua University,Beijing 100084, China) Tsinghua Univ Beijing China

This paper reports a new kind of laser measuring instrument applied to detect large diameters of a workpiece on the production floor. The measuring principle of the instrument is specified in detail.

关键词： diameter measurement laser CCD

Facile one-pot synthesis of a novel all-carbon stair containing dimerized pentalene core from alkyne

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Chinese Chemical Letters 2022年第4期33卷 2047-2051页

作者： Hui Zhao Rakesh Kumar Gupta Wei Zhang Jiong Jia Qun Yu Zhiyong Gao Guilin Zhuang dacheng li Xingpo Wang Chen Ho Tung Di Sun Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringState Key Laboratory of Crystal MaterialsShandong UniversityJi’nan 250100China College of Chemical Engineering and Materials Science Zhejiang University of TechnologyHangzhou 310032China School of Chemistry and Chemical Engineering Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine ChemicalsKey Laboratory of Green Chemical Media and ReactionsMinistry of EducationHenan Normal UniversityXinxiang 453007China Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology and School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252000China

The construction of all-carbon molecule frameworks remains challenging. Herein, we report a facile and efficient one-pot synthesis of a novel all-carbon stair containing dimerized pentalene core using inexpensive cyclopropyl alkyne catalyzed by in situ generated Cu(I) from the comproportionation reaction of Cu(II) salt and Cu powder under mild reaction conditions. The reaction proceeds via sequential acetylenic coupling, followed by cyclization and [2 + 2] cycloaddition to directly produce pentalene dimer, which is difficult to access by other established methods. Different mechanistic paths were studied for the pentalene formation using density functional theory, suggesting that the reaction also proceeds through acetylenic coupling followed by cyclization and [2 + 2] cycloaddition. Based on the activation energy barriers, Path 1 has the rate-determining step of 38.63 kcal/mol, which is the most thermodynamically preferred one among the four paths.

关键词： One-pot synthesis Penatlene dimerization Comproportionation reaction Crystal structure Theoretical calculations

Utilizing sediment grain size characteristics to assess the effectiveness of clay–sand barriers in reducing aeolian erosion in Minqin desert area,China

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Journal of Arid Land 2024年第5期16卷 668-684页

作者： SONG dacheng ZHAO Wenzhi li Guangyu WEI Lemin WANG lide YANG Jingyi WU Hao MA Quanlin College of Forestry Gansu Agricultural UniversityLanzhou 730070China Gansu Hexi Corridor Forest Ecosystem National Research Station Gansu Desert Control Research InstituteLanzhou 730070China linze Inland River Basin Research Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

The clay–sand barriers in Minqin desert area,China,represent a pioneering windbreak and sand fixation project with a venerable history of 60 ***,studies on evaluating the long-term effectiveness of clay–sand barriers against aeolian erosion,particularly from the perspective of surface sediment grain size,are limited and thus insufficient to ascertain the protective impact of these barriers on regional aeolian *** study focused on the surface sediments(topsoil of 0–3 cm depth)of clay–sand barriers in Minqin desert area to explain their erosion resistance from the perspective of surface sediment grain *** March 2023,six clay–sand barrier sampling plots with clay–sand barriers of different deployment durations(1,5,10,20,40,and 60 a)were selected as experimental plots,and one control sampling plot was set in an adjacent mobile sandy area without sand *** sediment samples were collected from the topsoil of each sampling plot in the study area in April 2023 and sediment grain size characteristics were *** indicated a predominance of fine and medium sands in the surface sediments of the study *** deployment of clay–sand barriers cultivated a fine quality in grain size composition of the regional surface sediments,increasing the average contents of very fine sand,silt,and clay by 30.82%,417.38%,and 381.52%,*** trend became markedly pronounced a decade after the deployment of clay–sand *** effectiveness of clay–sand barriers in erosion resistance was manifested through reduced wind velocity,the interception of sand flow,and the promotion of fine surface sediment *** particles such as medium,coarse,and very coarse sands predominantly accumulated on the external side of the barriers,while finer particles such as fine and very fine sands concentrated in the upwind(northwest)region of the *** contrast,the contents of finest particles such as silt and clay were higher in the downwind

关键词： clay-sand barriers sediment grain size grain size distribution aeolian erosion windbreak and sand fixation Minqin desert area

High-performance SiO_(x)/MgO_(x)electron-selective contacts for crystalline silicon solar cells

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Science China Materials 2024年第9期67卷 2866-2872页

作者： Kun li Kun Gao Xinyu Wang Xinliang Lou dacheng Xu Chunfang Xing Wenhao li Haicheng li Xinbo Yang College of Energy Soochow Institute for Energy and Materials InnovationS(SIEMIS)Soochow UniversitySuzhou215006China Institute of Functional Nano&Soft Materials Soochow UniversitySuzhou215123China

High carrier recombination loss at the metal and silicon contact regions is one of the dominant factors constraining the power conversion efficiency(PCE)of crystalline silicon(c-Si)solar *** compound-based carrier-selective contacts are being intensively developed to address this *** this work,we present a high-performance electron-selective SiO_(x)/MgO_(x)contact for c-Si solar *** SiO_(x)/MgO_(x)stack is prepared by thermally-grown SiO_(x)(∼0.7 nm)and thermally-evaporated MgO_(x)(~1.0 nm).The electron selectivity of SiO_(x)/MgO_(x)contact is investigated by measuring the surface passivation and the contact resistivity(ρ_(c))on the c-Si *** results demonstrate that optimized SiO_(x)/MgO_(x)contact displays a very lowρ_(c)(3.4 mΩcm^(2))and a good surface passivation on an n-type c-Si surface simultaneously.A high PCE of 21.1%is achieved on an n-type c-Si solar cell featuring a full-area SiO_(x)/MgO_(x)rear contact.

关键词： crystalline silicon solar cell electron-selective contact magnesium oxide

Analysis of Dynamic Interaction Between Deeply Embedded Platform and Foundation Soil

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China Ocean Engineering 1994年第3期9卷 251-258页

作者： Yao Minglun and li dacheng Professor, Tianjin University, Tianjing 300072

-Dynamic interaction characteristics of the model deeply embedded platform and foundation soil are studied by means of dynamic substructuring interface transformation synthesis and dynamic condensation. The theoretical analysis, computer programs and practical examples are presented; and the results are compared with those obtained by statical condensation method and finite element method.

关键词： platform foundation soil dynamic substructure dynamic condensation dynamic interaction

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纳米测量技术的挑战与机遇

仪器仪表学报 2005年第5期26卷 547-550页

作者：陈本永李达成浙江理工大学微纳米测控技术中心杭州310018 清华大学精密测试技术及仪器国家重点实验室北京100084

纳米测量技术是纳米科学技术的基础学科之一。纳米科学技术的快速发展,不但给纳米测量技术提出了挑战,同时也给纳米测量技术提供了全新发展的机遇。综述了国内外纳米测量技术发展的现状,重点讨论了纳米材料、纳米电子学和纳米生物学等... 详细信息

纳米测量技术是纳米科学技术的基础学科之一。纳米科学技术的快速发展,不但给纳米测量技术提出了挑战,同时也给纳米测量技术提供了全新发展的机遇。综述了国内外纳米测量技术发展的现状,重点讨论了纳米材料、纳米电子学和纳米生物学等领域所涉及的纳米测量与性能表征的难题和挑战,论述了纳米科技成果给纳米测量技术带来的发展机遇,最后对纳米测量技术的发展方向做了展望。

关键词：纳米测量技术纳米科学技术纳米生物学纳米电子学基础学科纳米材料性能表征发展机遇科技成果发展方向国内外