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Naphthalene decomposition in a DC corona radical shower discharge

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第1期12卷 71-77页

作者： ming-jiang ni Xu SHEN Xiang GAO Zu-liang WU Hao LU State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China College of Environmental Science and Engineering Zhejiang Gongshang University Hangzhou 310015 China Division of Combustion Physics Lund University S-22100 Lund Sweden

The naphthalene decomposition in a corona radical shower discharge (CRS) was investigated, with attention paid to the influences of voltage and initial naphthalene density. The OH emission spectra were investigated so as to know the naphthalene decomposing process. The by-products were analyzed and a decomposing theory in discharge was proposed. The results showed that higher voltage and relative humidity were effective on decomposition. The initial concentration affected the decomposing efficiency of naphthalene. When the initial naphthalene density was 17 mg/m3, the decomposition rate was found to be 70% under 14 kV. The main by-products were carbon dioxide and water. However, a small amount of carbonic oxide, 1,2-ethanediol and acetaldehyde were found due to the incomplete oxidization.

关键词： Naphthalene decomposition Corona Discharge OH radical

Application of the ISCST3 model for predicting PCDD/F concentrations in agricultural soil in the vicinity of a MSWI plant in China

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第3期9卷 373-380页

作者： Meng-xia XU Jian-hua YAN Sheng-yong LU Xiao-dong LI Tong CHEN ming-jiang ni Hui-fen DAI Ke-fa CEN State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China School of Medicine Zhejiang University Hangzhou 310058 China

Based on the Industrial Source Complex Short-Term Version 3 （ISCST3） model, a simplified modeling approach was developed to predict concentrations of congeners of polychlorinated-p-dioxins and dibenzofurans （PCDD/Fs） of agricultural soil, within a radius of 3 kin from a municipal solid waste incinerator （MSWI） plant after its 4-year operation in Hangzhou, China. Comparisons were made between the measured and estimated congener-specific concentrations and the international-toxic equivalent （I-TEQ） values of soil samples with respect to distance from the stack. The results indicate that the predictions of soil PCDD/F concentrations and K-TEQ values were generally lower than their observations, and that the higher the degree of underestimation seems, the greater the further downwind one gets. Nevertheless, most of the predictions were in good agreement with the trend of measured ones and were within a factor of ten for samples located within 1 kin of the plant. Besides, analysis of contributions of various deposition pathways confirms that in addition to wet particle deposition, the dry gaseous deposition is essential for realistic prediction of PCDD/F depositions to soil, especially for tetra- and penta-chlorinated dioxins.

关键词： Agricultural soil Dispersion model ISCST3 Municipal solid waste incinerator (MSWI) Polychlorinated-p-dioxins and dibenzofurans (PCDD/Fs)

基于七个运行参数建立煤粉锅炉NO_x排放模型（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2018年第4期19卷 315-328页

作者： Yue-lan WANG Zeng-yi MA Hai-hui YOU Yi-jun TANG Yue-liang SHEN ming-jiang ni Yong CHI Jian-hua YAN State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China Electric Power Research Institute of Guangdong Power Grid Corporation Guangzhou 510080 China

目的:采用最小二乘支持向量机建立煤粉锅炉NO_x排放模型,即建立输入参数与NO_x之间的关系。合理选择输入参数不仅会降低模型的复杂度,而且会提高模型的精度。为此,本文探讨各输入参数对模型的影响,并最终保留合适数量的输入参数建立NO_... 详细信息

目的:采用最小二乘支持向量机建立煤粉锅炉NO_x排放模型,即建立输入参数与NO_x之间的关系。合理选择输入参数不仅会降低模型的复杂度,而且会提高模型的精度。为此,本文探讨各输入参数对模型的影响,并最终保留合适数量的输入参数建立NO_x排放模型。创新点:1.采用最小二乘支持向量机建立NO_x排放模型;2.通过敏感性分析确定模型的最终输入参数。方法:1.根据专家知识及运行经验确定NO_x排放模型的初始输入参数(图2);2.根据锅炉的运行历史数据,采用最小二乘支持向量机建立NO_x排放模型;3.采用敏感性分析方法确定NO_x排放模型的最终输入参数(图11),并用其进行建模以验证模型的有效性。结论:1.采用最小二乘支持向量机建立的1000 MW超超临界前后墙对冲锅炉NO_x排放模型,可靠性和精度较高;2.经过敏感性分析,NO_x排放模型的输入参数由初始的33个降为7个,模型的复杂度降低且精度提高。

关键词：氮氧化物煤粉锅炉最小二乘支持向量机输入参数敏感性分析

基于时间分辨粒子图像测速技术的水平轴风力机近尾迹特性的实验研究（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2015年第7期16卷 586-595页

作者： Jian-wen WANG Ren-yu YUAN Xue-qing DONG San-xia ZHANG Yang SONG Zhi-ying GAO Kun LUO Kun-zan QIU ming-jiang ni Ke-fa CEN School of Energy and Power Engineering Inner Mongolia University of Technology Key Laboratory of Wind and Solar Power Energy Utilization Technology Ministry of Education and Inner Mongolia Construction State Key Laboratory of Clean Energy Utilization Zhejiang University

目的：探索风力机运行在不同尖速比下近尾迹流场的瞬态和时均特性,揭示风力机近尾迹场的涡量、流速、湍流和雷诺应力演化规律,为相关的数值模拟提供实验对比数据支撑。创新点：将时间分辨粒子图像测速技术应用于风力机近尾迹测量可以捕... 详细信息

目的：探索风力机运行在不同尖速比下近尾迹流场的瞬态和时均特性,揭示风力机近尾迹场的涡量、流速、湍流和雷诺应力演化规律,为相关的数值模拟提供实验对比数据支撑。创新点：将时间分辨粒子图像测速技术应用于风力机近尾迹测量可以捕捉到较高时间分辨率和高精度的流动信息,进而揭示风力机近尾迹详细的流动机理。方法：实验在风洞里面进行,利用时间分辨粒子图像测速技术获得风力机瞬时流场（图1-3）,通过调节风力机配套电机的负荷输出可以得到不同的运行尖速比。对测量得到的瞬时速度的后处理可以得到瞬时涡量以及湍动能和雷诺应力的时均值。结论：1.风力机近尾迹区域沿径向可分为速度增益区、速度保持区和速度亏损区,不同尖速比下速度恢复到主流速度的径向位置基本相同;2.在后半个半径长度区域内,径向平均速度沿径向方向有增加的趋势,而在叶尖以上,径向平均速度沿径向减小;3.近尾迹湍动能在径向方向上0.3倍和0.9倍半径高度处会出现峰值,而在0.6倍半径附近位置会出现湍动能最低值;4.在风力机近尾迹,雷诺剪切应力小于雷诺正应力,在叶根附近,轴向雷诺正应力大于径向雷诺正应力以及雷诺剪切应力,而在叶尖处,径向雷诺正应力大于轴向雷诺正应力以及雷诺剪切应力。

关键词：时间分辨粒子图像测速风力机尖速比近尾迹流动特性

Deciphering fungal metabolon coupling tandem inverse-electrondemand Diels-Alder reaction and semipinacol rearrangement for the biosynthesis of spiro polycyclic alkaloids

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Science China Chemistry 2025年第1期68卷 288-296页

作者： Shuai Liu Wen-Qiang Xu Ying-Tong Di Man-Cheng Tang Ding-Kang Chen ming-ming Cao Yao-Wen Chang Hong-Yu Tang Chun-Mao Yuan Jun-Bo Yang Zhi-Li Zuo Han Guo Zi-Fei Xu Ying Zeng Yun-Dong Wu Xiao-jiang Hao Key Laboratory of Phytochemistry and Natural Medicines (Chinese Academy of Sciences) Kunming Institute of Botany Chinese Academy of Sciences University of Chinese Academy of Sciences Lab of Computational Chemistry and Drug Design State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen Bay Laboratory State Key Laboratory of Microbial Metabolism School of Life Sciences & Biotechnology Shanghai Jiao Tong University State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical University Molecular Biology Experimental Center Germplasm Bank of Wild Species in Southwest China Kunming Institute of Botany Chinese Academy of Sciences Yunnan Key Laboratory for Wild Plant Resources Kunming Institute of Botany Chinese Academy of Sciences Research Unit of Chemical Biology of Natural Anti-Virus Products Chinese Academy of Medical Sciences

In the intricate process of natural product biosynthesis, a metabolon can enhance metabolic flux by associating sequential enzymes. A fungal metabolon, comprising of flavin-dependent monooxygenase Spe F and P450 monooxygenase Spe G, is identified in the biosynthesis of spiro polycyclic alkaloids(+)-notoamide B and its diastereomer(+)-versicolamide B. Using notoamide E as a substance, Spe F/Spe G metabolon can control the stereoselectivity of its 2,3-epoxidation, followed by hydrogen atom ion at C-17 to generate reactive epoxide tau-m A with dienyl iminium unit. Subsequently,(+)-notoamide B and(+)-versicolamide B are produced via tandem nonenzymatic inverse-electron-demand Diels-Alder reaction and semipinacol rearrangement. This provides the first example of metabolon in the biosynthesis of spiro-prenylated indole alkaloids.

关键词： metabolon Diels-Alder reaction semipinacol rearrangement biosynthesis notoamides spiro polycyclic alkaloids

A dual-site Fe-based catalyst for efficient ammonia synthesis under mild conditions

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Science China Chemistry 2025年

作者： Shiyong Zhang mingyuan Zhang Tianhua Zhang Jizhen Sun Jiaxin Li Kailin Su Ruishao Mao Yanliang Zhou Xuanbei Peng Yangyu Zhang Jun ni Bingyu Lin Xiuyun Wang Lilong jiang National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou University Qingyuan Innovation Laboratory

Achieving green ammonia （NH3） synthesis requires developing effective catalysts under mild ***,the competitive adsorption of N2and H2,as well as the strong binding of N-containing intermediates on the catalyst,greatly inhibits the active sites for efficient ***,we constructed a series of ZrH2-modified Fe catalysts with dual active sites to address these issues and realized efficient NH3synthesis under mild *** study shows that ZrH2can not only provide active sites for H2activation but also transfer electrons to Fe sites for accelerating *** interaction between Fe and ZrH2over 40ZrH2-Fe leads to a decrease in work function and a downward shift of the d-band center,which is conducive to N2activation and NH3desorption,*** utilization of distinct sites for activating different reactants can avoid the competitive adsorption of N2and H2,leading to excellent NH3synthesis activity of the 40 wt.%ZrH2-mediated Fe *** a result,40ZrH2-Fe exhibits a high NH3synthesis rate of 23.3 mmol g-1cath-1at 400°C and 1 MPa and robust stability during100 h time-on-stream.

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Homologous CoS2 interface with directed electron transfer and strong chloridion repulsion for efficient seawater oxidation

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Science China Chemistry 2025年

作者： Yuan Tian jiang-Bo Chen Jie Ying Ge Tian Yu-Xuan Xiao Yi Lu Si-ming Wu Wei Geng Ling Shen Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering and Shenzhen Research Institute & Laoshan Laboratory Wuhan University of Technology School of Chemical Engineering and Technology Sun Yat-Sen University National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu Laboratory

Seawater electrolysis is a highly promising method to produce high energy density hydrogen,especially in dry areas that have scarce freshwater ***,application of seawater electrolysis is confronted by two major problems associated with catalysts employed for the anodic oxygen evolution reaction （OER） including the competitive hypochlorite evolution reaction（HCER） and strong chloridion （Cl–） triggered *** studies aimed at overcoming these problems,a facile method has been developed to synthesize a homologous CoS2heterojunction as an OER *** to a difference in work functions at the interface and increased electron density,this material has directed electron transfer and strong chloridion repulsion properties,*** have shown that CoS2achieves low overpotentials of 289 and 322 mV at 10 mA cm-2current density in respective alkaline （1 M KOH） and alkaline simulated seawater ***,the outstanding stability of CoS2is reflected in a negligible decline in activity during promotion of the OER for 100 *** of density functional theory calculations reveal that the homologous CoS2heterojunction promotes directed electron transport for optimizing adsorption/desorption of reactive species and heightens the Cl-adsorption energy for strongly repulsing Cl-,phenomena that enhance OER performance in alkaline simulated seawater.

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新型农村集体经济促进农民共同富裕的演进逻辑和创新路径

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西北农林科技大学学报（社会科学版） 2025年第1期25卷 69-77页

作者：樊晓燕蒋明西安交通大学马克思主义学院西安710049 西安理工大学马克思主义学院西安710048

新型农村集体经济具有市场性和社区性,农民共同富裕强调发展性和共享性两个维度的目标,二者在基本原则的人民性、实现途径的互助性和目标指向的全面性上相契合,这是构建新型农村集体经济促进农民共同富裕理论分析框架的基础。理论发展... 详细信息

新型农村集体经济具有市场性和社区性,农民共同富裕强调发展性和共享性两个维度的目标,二者在基本原则的人民性、实现途径的互助性和目标指向的全面性上相契合,这是构建新型农村集体经济促进农民共同富裕理论分析框架的基础。理论发展、实践探索和现实需求是揭示新型农村集体经济促进农民共同富裕内在逻辑演进的三个方面:理论逻辑是坚持公有制基础上农村集体经济制度的理论创新;历史逻辑是中国特色农业农村现代化的发展历程;现实逻辑是发展新型农村集体经济对乡村全面振兴的重大意义。由此从产权制度、分配制度和基层治理制度创新的整体视角提出新型农村集体经济促进农民共同富裕的创新路径。坚持以人民为中心的发展理念,发挥新型农村集体经济的战略作用,探索新型农村集体经济的发展规律是新型农村集体经济促进农民共同富裕需要坚持的重要原则。

关键词：新型农村集体经济农民共同富裕制度创新

Effect of lamellarization on the microstructure and mechanical properties of marine 10ni5CrMoV steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 402-413页

作者： Tao Zou Yanwu Dong Zhouhua jiang Shuyang Du Yushuo Li School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Northeastern UniversityShenyang 110819China

Multistage heat treatment involving quenching(Q),lamellarizing(L),and tempering(T)is applied to marine 10ni5CrMoV *** microstructure and mechanical properties were studied by multiscale characterizations,and the kinetics of reverse austenite transformation,strain hardening behavior,and toughening mechanism were further *** lamellarized specimens possess low yield strength but high toughness,especially cryogenic *** leads to the development of film-like reversed austenite at the martensite block and lath boundaries,refining the martensite structure and lowering the equivalent grain *** analysis of austenite reversion based on the JMAK model shows that the isothermal transformation is dominated by the growth of reversed austenite,and the maximum transformation of reversed austenite is reached at the peak temperature(750℃).The strain hardening behavior based on the modified Crussard-Jaoul analysis indicates that the reversed austenite obtained from lamellarization reduces the proportion of martensite,significantly hindering crack propagation via martensitic transformation during the *** a consequence,the QLT specimens exhibit high machinability and low yield *** with the QT specimen,the ductile-brittle transition temperature of the QLT specimens decreases from-116 to-130℃due to the low equivalent grain size and reversed austenite,which increases the cleavage force required for crack propagation and absorbs the energy of external load,*** work provides an idea to improve the cryogenic toughness of marine 10ni5CrMoV steel and lays a theoretical foundation for its industrial application and comprehensive performance improvement.

关键词： 10ni5CrMoV steel lamellarizing reversed austenite cryogenic toughness ductile-brittle transition temperature