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Multifunctional silicene/CeO_(2)heterojunctions:Desirable electronic material and promising water-splitting photocatalyst

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Chinese Chemical Letters 2022年第8期33卷 3947-3950页

作者： Liang Xu jian zeng Quan Li Xin Luo Tong Chen Jingjing Liu Ling-Ling Wang Energy Materials Computing Center School of Energy and Mechanical EngineeringJiangxi University of Science and TechnologyNanchang 330013China Department of Applied Physics School of ScienceEast China Jiaotong UniversityNanchang 330013China Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education School of Physics and ElectronicsHunan UniversityChangsha 410082China

The first-principles calculations demonstrate that covalently bonded(cb)heterojunction and van der Waals(vd W)heterojunction can coexist in silicene/CeO_(2) heterojunctions,due to the different stacking ***,the cb heterojunction with band gap of 1.97 e V,forms a type-II heterojunction,exhibits good redox performance and has high-effective optical absorption spectra,thus it is a promising photocatalyst for overall water ***,for the vd W heterojunction,the Dirac cone of silicene is well kept on CeO_(2) semiconducting substrate,with a considerable energy gap of 0.43 e V,which can be an ideal material in building silicene-based electronic *** results may open a new gateway in both of nanoelectronic device and energy conversion for silicene/Ce O2 nanocomposites.

关键词： Silicene CeO_(2) Photocatalyst Interfacial interaction Dirac cone

Characterization and Wettability of ZnO Film Prepared by Chemical Etching Method

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Chemical Research in Chinese Universities 2013年第2期29卷 333-337页

作者： GUO Hua-xi JIA Hui-ying zeng jian-bo CONG Qian REN Lu-quan Key Laboratory of Bionic Engineering Ministry of Education Jilin University Changchun 130025 P. R. China

ZnO thin films were prepared by a chemical etching method and their wettability was investigated. The structure and surface composition structure were characterized by means of scanning electron microscopy, X-ray photoelectronic spectrometry（XPS）, X-ray diffraction（XRD） and Raman spectrometry. These analyses reveal that the etched films were large-scale micro-nanohierarchical structures composed of a Zn core and a ZnO coating. Superhy- drophobic surfaces with water contact angles of over 150~ were obtained by n-octadecanethiol（ODT） modification. The XPS and Raman results indicate that ODT molecules were bound to the ZnO surface with the S head group by forming Zn--S bond.

关键词： ZnO Chemical etching Micro-nanostructure Raman spectrometry Wettability

Nitrogen isotopic fractionation of particulate organic matter production and remineralization in the Prydz Bay and its adjacent areas

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Acta Oceanologica Sinica 2020年第12期39卷 42-53页

作者： Chunyan Ren Min Chen Laodong Guo jian zeng Renming Jia Xiao Liu Minfang Zheng Yusheng Qiu College of Ocean and Earth Sciences Xiamen UniversityXiamen 361005China School of Freshwater Sciences University of Wisconsin-MilwaukeeMilwaukeeWI 53204USA

During the 29 th Chinese National Antarctic Research Expedition,spatial variations in nitrogen isotopic composition of particulate nitrogen(δ15NPN)and their controlling factors were examined in detail with regard to nitrate drawdown by phytoplankton and particulate nitrogen(PN)remineralization in the Prydz Bay and its adjacent *** better constrain the nitrogen transformations,the physical and chemical parameters,including temperature,salinity,nutrients,PN andδ15NPN in seawater column were measured from surface to *** addition,the nitrogen isotopic fractionation factor of nitrate assimilation by phytoplankton in the mixed layer,and the nitrogen isotopic fractionation factor of PN remineralization below the mixed layer were estimated using Rayleigh model and Steady State model,*** results showed that suspended particles had its lowestδ15NPN in the surface layer,which was due to the preferential assimilation of 14 N in nitrate by ***δ15NPN in the mixed layer of the Prydz Bay and its adjacent areas decreased from the inner shelf to the outer basin,ascribing to the effect of isotope fractionation during phytoplankton *** mixed layer,the spatial distribution ofδ15NPN associated with particulate organic matter(POM)production can be well interpreted according to Rayleigh model and Steady State *** nitrogen isotope fractionation factor during phytoplankton assimilating nitrate was estimated as 10.0‰by Steady State model,which was more reasonable than that calculated by Rayleigh *** results validate the previous reports of fractionation factor during nitrate assimilation by ***δ15NPN with depth below the euphotic zone correlated with the decreasing PN contents,and it was attributed to preferential remineralization of 14 N in PN by *** subsurface and deep layer,theδ15NPN distributions also conformed to Rayleigh model and Steady State model during PN remineralization,with a fractionatio

关键词： PN δ^(15)N^(PN) isotopic fractionation POM production remineralization Prydz Bay

秸秆还田和添加生物炭对热带地区稻菜轮作体系中淹水后土壤温室气体排放的影响

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环境科学 2024年第3期45卷 1692-1701页

作者：胡天怡车佳玥胡煜杰陈绮琦张冬明雷菲曾建华汤水荣伍延正孟磊海南大学热带作物学院海口570228 海南省农业科学院农业环境与土壤研究所海口571100 农业农村部海南耕地保育科学观测试验站海口571100 海南省耕地保育重点实验室海口571100

热区稻菜轮作系统瓜菜季施肥后大量硝态氮积累,导致后续的水稻季淹水后硝态氮的淋失以及大量N_(2)O排放,使氮素损失以及温室效应加剧.如何提高硝态氮利用率,减少N_(2)O排放成为了亟待解决的问题.试验共设置6个处理:添加200 mg·kg^(-1)(... 详细信息

热区稻菜轮作系统瓜菜季施肥后大量硝态氮积累,导致后续的水稻季淹水后硝态氮的淋失以及大量N_(2)O排放,使氮素损失以及温室效应加剧.如何提高硝态氮利用率,减少N_(2)O排放成为了亟待解决的问题.试验共设置6个处理:添加200 mg·kg^(-1)(以N计,下同)KNO_(3)(CK);添加200 mg·kg^(-1)KNO_(3)+2%生物炭(B);添加200 mg·kg^(-1)KNO_(3)和1%花生秸秆(P);添加200 mg·kg^(-1)KNO_(3)+2%生物炭+1%花生秸秆(P+B);添加200 mg·kg^(-1)KNO_(3)+1%水稻秸秆(R);添加200 mg·kg^(-1)KNO_(3)+2%生物炭+1%水稻秸秆(R+B),进行114 d的25℃恒温淹水培养,来探究有机物料添加对土壤淹水后温室气体排放和氮素利用的影响.结果表明,与CK相比,添加秸秆或秸秆和生物炭配施显著增加了土壤pH(P<0.05);B和P处理分别显著增加了41.6%和28.5%的N_(2)O累计排放(P<0.05),P+B、R和R+B处理分别显著降低了14.1%、24.7%和36.7%的N_(2)O累计排放(P<0.05);添加秸秆增加了净温室气体增温潜势(NGWP),增施椰壳生物炭能够显著减缓秸秆对NGWP的影响(P<0.05),秸秆和生物炭配合施用降低了NGWP,其中P+B显著降低NGWP(P<0.05),R+B不显著;添加秸秆或生物炭显著增加了土壤微生物量碳(MBC)(P<0.05),P+B最高,为502.26mg·kg^(-1);秸秆和生物炭配施增加了土壤微生物量氮(MBN),P+B最高.N_(2)O排放通量与pH呈极显著负相关(P<0.01),与NH_(4)^(+)-N和NO_(3)^(-)-N呈极显著正相关(P<0.01);N_(2)O累计排放量与MBN呈极显著负相关(P<0.01);NO_(3)^(-)-N与MBN呈显著负相关(P<0.05),说明硝态氮的减少可能被微生物固持,微生物对硝态氮固持的增加也减少了N_(2)O排放.综上所述,花生秸秆和椰壳生物炭配合施用能够显著抑制N_(2)O排放,增加土壤MBC和MBN,是一种海南瓜菜季后充分利用氮肥,减少氮素损失,减缓N_(2)O排放的一种合理措施.

关键词：生物炭秸秆氧化亚氮(N_(2)O) 土壤微生物量碳氮硝态氮

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数据挖掘聚类算法在电力系统中的应用

信息技术 2024年第2期48卷 172-179页

作者：赵瑞锋李波卢建刚李世明曾坚永郑文杰广东电网有限责任公司电力调度控制中心广州510600

针对电力系统当前输出数据多、数据应用能力差等问题,提出一种新型的数据挖掘方法。构建改进型数据挖掘聚类算法模型,通过FCM聚类算法模型实现电力系统应用过程中不同状态数据分析、计算与应用;构建回归算法模型,实现分类后数据信息的预... 详细信息

针对电力系统当前输出数据多、数据应用能力差等问题,提出一种新型的数据挖掘方法。构建改进型数据挖掘聚类算法模型,通过FCM聚类算法模型实现电力系统应用过程中不同状态数据分析、计算与应用;构建回归算法模型,实现分类后数据信息的预测;通过构建电力系统应用模型,将不同的数据信息融合后,实现了多种数据信息的挖掘与应用。实验证明,该研究方法分类能力强、预测精度高,可推广使用。

关键词：数据挖掘 FCM聚类算法模型回归算法模型预测精度电力系统

Ecological risk assessment of the Gannan Plateau,northeastern Tibetan Plateau

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Journal of Mountain Science 2018年第6期15卷 1254-1267页

作者： YUE Dong-xia zeng jian-jun YANG Chao ZOU Ming-liang LI Kai CHEN Guan-guang GUO jian-jun Xu Xiao-feng Meng Xing-min Key Laboratory of Western China＇s Environmental Systems （Ministry of Education） College of Earth and Environmental Sciences Lanzhou University Lanzhou 730000 China Key Laboratory of Desert and Desertification Northwest Institute of Eeo-Environment and Resources Chinese Academy of Sciences Lanzhou 730000 China School of Management Lanzhou University Lanzhou 730000 China

Desertification, soil salinization and grassland degradation are the major environmental hazards faced by the Gannan Plateau, northeastern Tibetan Plateau. Ecological risk assessment plays an important role in formulating environmental management strategies yet little attention to this region. In this study, we established an ecological risk assessment index system based on 30 evaluation indices in the categories of hydrometeorology, ecological environment, ground surface disturbance, and society and economy for the Gannan Plateau. An entropy method was used to calculate an index weight,and subsequently the matter-element method was used together with extension theory to establish a matter-element extension model of ecological risk. We assessed the ecological risk in this region by calculating the degree of association between index layer, system layer and target layer, and the cumulative ecological risk index. The degrees of ecological risk for the counties of the region were determined by using Arc GIS which would represent a spatial heterogeneity of the risk grade in production. Our results showed that the areas of high ecological risk were in Zhouqu County and Zhuoni County, and others were of low risk(Hezuo City, Diebu County, Xiahe County and Lintan County) or intermediate risk(Maqu County). The results of the assessment were in accord with the actual observed situation. Thus, our ecological risk assessment index system is appropriate for this region and suggests that high risk counties need a priori ecological protection. Such research could provide a technological support which would potentially prevent or reduce disasters by establishing an ecological barrier to promote the sustainable development of Gannan Plateau.

关键词： Matter-element Extension theory Ecological risk assessment Ecosystem GannanPlateau

工程教育专业认证下的课程建设实践探索——以“现代交流传动及其控制系统”为例

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教育教学论坛 2024年第6期 96-99页

作者：章勇高刘鹏叶满园曾建军华东交通大学电气与自动化工程学院江西南昌330013

课程建设是工程教育专业认证体系中的重要指标,通过“现代交流传动及其控制系统”课程建设,探索工程专业的课程建设模式。围绕专业培养目标和毕业要求,制定了课程教学大纲,确定了课程教学目标及与毕业要求的对应关系,讨论了课堂教学模... 详细信息

课程建设是工程教育专业认证体系中的重要指标,通过“现代交流传动及其控制系统”课程建设,探索工程专业的课程建设模式。围绕专业培养目标和毕业要求,制定了课程教学大纲,确定了课程教学目标及与毕业要求的对应关系,讨论了课堂教学模式和教学方式的组织形式,设计了课程考核方式及考核指标的标准,最后提出课程教学改进措施。从大纲制定、课堂教学组织、课程考核、考核评估及改进措施五个方面说明课程建设如何实现课程目标及与毕业要求的对应关系,满足工程教育专业认证要求,提升课程教学质量。

关键词：工程教育专业认证课程教学现代交流传动及其控制系统

基于网络药理学和分子对接法探讨不换金正气散治疗新型冠状病毒感染的活性成分

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中国处方药 2024年第5期22卷 1-4页

作者：林远茂陈梓焜曾建荣吴凌华广东潮州卫生健康职业学院广东潮州521000 泰州市第四人民医院江苏泰州225300

目的基于网络药理学和分子对接法探讨不换金正气散治疗新型冠状病毒(2019-nCoV)感染的活性成分。方法通过中药系统药理学分析平台(TCMSP)获得不换金正气散中药物相关的成分和作用靶点,通过UniProt数据库查询靶点对应的基因;运用Cytoscap... 详细信息

目的基于网络药理学和分子对接法探讨不换金正气散治疗新型冠状病毒(2019-nCoV)感染的活性成分。方法通过中药系统药理学分析平台(TCMSP)获得不换金正气散中药物相关的成分和作用靶点,通过UniProt数据库查询靶点对应的基因;运用Cytoscape(3.6.0)构建“药物-化学成分-靶点”网络;DAVID进行基因本体论功能富集分析(GO)和京都基因与基因组百科全书富集分析(KEGG)。使用Autodock Vina(1.1.2)软件对不换金正气散核心化学成分与2019-nCoV 3CL水解酶进行分子对接验证。结果共获得有116个活性化学成分,对应150个靶点,主要涉及槲皮素、山奈酚、葛花苷元等化学成分。DAVID分析主要涉及多个生物学过程,KEGG通路涉及肿瘤坏死因子(TNF)信号通路、甲型流感、磷脂酰肌醇3激酶-蛋白激酶B(PI3K-Akt)信号通路、低氧诱导因子-1(HIF-1)信号通路等。分子对接结果显示槲皮素、山奈酚、葛花苷元等主要化合物与2019-nCoV 3CL水解酶的结合能均与参照药物相近。结论初步预测了不换金正气散干预新型冠状病毒感染(COVID-19)的化学成分可与2019-nCoV 3CL水解酶结合,作用雌激素受体1(ESR1)、过氧化物酶体增殖物激活的受体γ(PPARG)、前列腺素G/H合酶1(PTGS1)等靶点,多通路协同干预,对COVID-19具有潜在治疗作用。

关键词：不换金正气散网络药理学新型冠状病毒感染分子对接 2019-nCoV 3CL水解酶

Formability of TRIP/TWIP Steel Containing Manganese of 18.8%

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Journal of Iron and Steel Research International 2011年第1期18卷 36-40页

作者： DING Hao DING Hua QIU Chun-lin TANG Zheng you zeng jian min YANG Ping School of Materials and Metallurgy Northeastern University Shenyang 110819 I.iaoning China State Key l.aboratory of Rolling and Automation of Northeastern University Shenyang 110819 I.iaoning China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The mechanical property and forming limit experiments were carried out on a higli manganese TRIP/TWIP steels with manganese of 18.8%. And the forming /imit diagram was obtained. This hig：h manganese steel shows outstanding mechanical properties comhining high strength with good formability. Its limit plane strain corresponding to the lowest point in the plain strain condition is about 38%. The effects of conventional mechanical property on the limit plane strain were analyzed. With increasing the content of Mn, the limit plane strain increases, indicating that TWlP effect is advantageous to the increase of formability. Combining with three classical models and volume invaria ble principle, a FLD model was buih, which is suitable for high manganese steels very well.

关键词： high manganese TRIP/TWIP steel mechanical property formability forming limit diagram