检索结果-南通市图书馆

Effects of calcination temperature on physicochemical property and activity of CuSO4/TiO2 ammonia-selective catalytic reduction catalysts

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第5期32卷 237-245页

作者： Yanke Yu Jiali Zhang changwei chen Chi He Jifa Miao Huirong Li Jinsheng chen Department of Environmental Science and Engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi'an 710049China Department of Chemical Engineering Columbia UniversityNew York 10027USA College of Geology and Environment Xi’an University of Science and TechnologyXi’an 710054China National Engineering Laboratory for VOCs Pollution Control Material and Technology University of Chinese Academy of SciencesBeijing 101408China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China

CuSO4/TiO2 catalysts with high catalytic activity and excellent resistant to SO2 and H2 O,were thought to be promising catalysts used in Selective catalytic reduction of nitrogen oxides by NH3.The performance of catalysts is largely affected by calcination temperature.Here,effects of calcination temperature on physicochemical property and catalytic activity of CuSO4/TiO2 catalysts were investigated in depth.Catalyst samples calcined at different temperatures were prepared first and then physicochemical properties of the catalyst were characterized by N2 adsorption-desorption,X-ray diffraction,thermogravimetric analysis,Raman spectra,Fourier-transform infrared spectroscopy,X-ray photoelectron spectroscopy,temperature-pro grammed desorption of NH3,temperature-programmed reduction of H2 and in situ diffuse reflectance infrared Fourier transform spectroscopy.Results revealed that high calcination temperature had three main effects on the catalyst.First,sintering and anatase transform into rutile with increase of calcination temperature,causing a decrement of specific surface area.Second,decomposition of CuSO4 under higher calcination temperature,resulting in disappears of Br(?)nsted acid sites(S-OH),which had an adverse effect on surface acidity.Third,CuO from the decomposition of CuSO4 changed surface reducibility of the catalyst and favored the process of NH3 oxidation to nitrogen oxides(NOx).Thus,catalytic activity of the catalyst calcined under high temperatures(≥600℃)decreased largely.

关键词： Calcination temperature Sulfate catalyst Selective catalytic reduction of nitrogen oxides by NH3 Surface acidity NH3 oxidation

Oxoarylation of ynamides with N-aryl hydroxamic acids

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第8期32卷 2551-2554页

作者： changwei chen Hongyu Zhang Gang Xu Sunliang Cui College of Pharmaceutical Sciences Zhejiang UniversityHangzhou 310027China College of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310058China

Ynamides are electron-rich alkynes with unique reactivities and act as flexible building blocks in organic synthesis.Therefore,the investigation for transformation of ynamides with exceptional selectivity and efficiency is attractive and interesting.Herein,we report an oxoarylation of ynamides with N-aryl hydroxamic acids.In the presence of catalytic Cu(OTf)_(2),both the terminal and internal ynamides could undergo an addition/[3,3] sigmatropic rearrangement cascade with N-aryl hydroxamic acids to achieve oxoarylation,along with providing selective entry to(ortho-amino)arylacetamides and oxindoles.Moreover,deuterium-labelling reaction and gram-scale reaction were conducted to probe the mechanism and showcase the scalability.

关键词： Ynamide Hydroxamic acid Oxoarylation Oxindole Rearrangement

A Transgressive Depositional Setting for the Paleogene Shahejie Formation in the Qikou Depression, Eastern China: Inferences from the REE Geochemistry of Carbonates

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2018年第2期29卷 326-341页

作者： Yang Yang Fuhong Gao changwei chen Xiugang Pu School of Prospecting & Surveying Engineering Changchun Institute of Technology College of Earth Sciences Jilin University Research Institute of Exploration and Development Dagang Oilfield Company CNPC

Rare earth element （REE） and Y concentrations, and S7Sr/S6Sr ratios were analyzed in 33 carbonate samples from the Paleogene Shahejie Formation in the Qikou depression, eastern China, with the goal of determining depositional environments and post-depositional conditions of carbonates in the region. The REE and Y concentrations were normalized to the post-Archean Australian shale （PAAS） standard. The La＊pAAs/Yb＊pAAS ratios of 0.35-1.52, where ＊PAAS indicates values for the PAAS standard, show fight REE enrichment and heavy REE depletion in most samples. Values of La＊PAAS （0.775-1.284） and Ce＊PAAS （0.822-L224）, coupled with a relatively flat REE distribution, indicate that the Shahejie car- bonates were deposited in lacustrine environments. Values of Y anomalies （1.009-1.527） and Y/Ho ratios （28.43-45.00） in the Shahejie Formation are greater than those of lacustrine carbonates and closer to those of marine carbonates, indicating that diagenetic fluids were probably influenced by seawater. In the car- bonates from Well Kou-42, Eu anomalies （1.171-1.604）, ^87Sr/^86Sr ratios （0.708 001-0.710 893）, and high homogenization temperatures （104-151 ℃） suggest that the carbonates were affected by hydrothermal fluids. The REEs and Sr isotope ratios show that the carbonates from the Shahejie Formation in the Qikou depression were deposited in lacustrine environments, and were influenced by seawater and hydrothermal fluids.

关键词： Paleogene carbonate REE Qikou depression.

Micropore structure characteristics and quantitative characterization methods of lacustrine shale-A case study from the member 2 of Kongdian Formation, Cangdong sag, Bohai Bay Basin

在线全文

学校读者我要写书评

暂无评论

Petroleum Research 2020年第2期5卷 93-102页

作者： Lihong Zhou changwei chen Fei Yang Wenzhong Han Quansheng Guan China National Petroleum Corporation Ltd. Dagang Oilfield BranchTianjin300280China

To better understand the micropore characteristics of lacustrine shale and develop quantitative methodsfor characterizing lacustrine shale, the reservoir space types, structures and spatial distribution patternsof effective pores in the shale of Member 2 of Kongdian Formation in Cangdong sag are studied usingcores, thin sections, scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM),nuclear magnetic resonance (NMR), whole-rock X-ray diffraction (XRD) data, etc. Various shale porositycalculation methods are evaluated. The study results show that the reservoir spaces of the shale mainlyinclude three types, i.e., matrix pores, organic pores and fractures. Flaky pore throats formed bydissolution-induced pores and mould pores can improve the pore connectivity. NMR effective porosity ofthe shale varies from 0.59% to 4.42% with an average of 2.38%, accounting for 49.54% of the total NMRporosity and 34.53% of the gas porosity. The shale is divided into the unimodal-type felsic shale, bimodaltype felsic shale, carbonate shale and mixed shale. The different lithologies exhibit linear correlationsamong NMR, gas and effective porosities. The shale has effective porosity of 0.56%-4.53% with an averageof 2.12%. Furthermore, the shale reservoir is divided into four classes: Class I reservoir with effectiveporosities of more than 2.5%;Class II1 reservoir with effective porosity of 2.0%-2.5%;Class II2 reservoirwith effective porosity of 1.5%-2%;and Class III reservoir with effective porosity of less than 1.5%.

关键词： Lacustrine shale Rservoir space type Pore structure Effective porosity Sweet spot evaluation Member 2 of Kongdian Formation Cangdong sag Bohai Bay Basin

基于机载激光雷达点云数据的1:10000地形图地貌要素生产方法研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

品牌与标准化 2024年第4期 121-123页

作者：陈长伟辽宁省检验检测认证中心辽宁沈阳110036

随着测绘科技水平的发展,机载LiDAR技术得到了广泛应用。本文利用机载LiDAR点云数据对1:10000地形图地貌要素的生产方法进行研究,对研究区开展生产试验和精度检测。结果表明,产品精度满足1:10000地形图地貌要素的生产要求,达到了相关高... 详细信息

随着测绘科技水平的发展,机载LiDAR技术得到了广泛应用。本文利用机载LiDAR点云数据对1:10000地形图地貌要素的生产方法进行研究,对研究区开展生产试验和精度检测。结果表明,产品精度满足1:10000地形图地貌要素的生产要求,达到了相关高程精度的要求。

关键词：机载LiDAR 点云数据地貌要素

1∶10000基础地理信息数据生产基础地理实体数据

在线全文

学校读者我要写书评

暂无评论

品牌与标准化 2024年第3期 151-153页

作者：陈长伟辽宁省检验检测认证中心辽宁沈阳110036

本文结合辽宁省基础地理实体生产试点,以沈阳市及周边县区作为基础地理实体数据试生产区域,探索了1∶10000基础地理信息数据制作基础地理实体数据的技术流程和内容,总结了数据生产过程中的心得体会,为基础地理实体数据大规模生产提供借... 详细信息

本文结合辽宁省基础地理实体生产试点,以沈阳市及周边县区作为基础地理实体数据试生产区域,探索了1∶10000基础地理信息数据制作基础地理实体数据的技术流程和内容,总结了数据生产过程中的心得体会,为基础地理实体数据大规模生产提供借鉴和参考。

关键词：基础地理实体地理信息数据

西非Termit盆地石油地质特征及成藏主控因素

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

西北地质 2024年第3期57卷 223-236页

作者：陈长伟汤戈周博宇苏俊青郭怡辉滑双君葛维中国石油大港油田公司勘探开发研究院天津300280 中国石油工程技术研究有限公司天津300450 天津中油渤星工程科技有限公司天津300450

西非Termit盆地是中国石油在非洲极为重要的勘探开发区块。在充分利用钻井、分析化验和地震资料基础上,开展了Termit盆地石油地质特征和成藏主控因素研究,研究表明:①Ter-mit盆地历经前裂谷期、同裂谷期、后裂谷期三大构造演化阶段,同... 详细信息

西非Termit盆地是中国石油在非洲极为重要的勘探开发区块。在充分利用钻井、分析化验和地震资料基础上,开展了Termit盆地石油地质特征和成藏主控因素研究,研究表明:①Ter-mit盆地历经前裂谷期、同裂谷期、后裂谷期三大构造演化阶段,同裂谷期发育早晚两期裂谷作用形成中生代—新生代叠置裂谷盆地,宏观具有“东西分带、南北分块”的构造结构特征,控制圈闭的形成与分布。②发育上白垩统Yogou组分布广(18000 km^(2))、厚度大(600~1400 m)、成熟度适中(Ro值为0.7%~1.3%)的海相烃源岩,配置上白垩统Yogou组顶部发育的海相三角洲、古近系Sokor1组辫状河三角洲砂体,及古近系Sokor2组区域性分布的泥岩盖层,形成了上、下两套成藏组合;③明确古近系、白垩系成藏主控因素,古近系为“下生上储”的次生油气藏,油气平面和垂向分布受生烃灶、区域盖层、油源断层和优势沉积相控制,白垩系为“自生自储”原生油藏,油气富集受区域构造活动强度和白垩系内幕构造控制。④构建了基于海相广覆式烃源岩的跨世代油气成藏模式,明确Dinga断阶带、Fana凸起和Araga地堑是古近系油气勘探的有利区带,造活动相对较弱的Moul凹陷及Dinga断阶带南部是白垩系油气勘探的有利区带。地质认识指导勘探部署,在尼日尔Termit盆地获得了重大勘探突破,累计探明石油地质储量超7亿t,为中国石油海外油气增储上产奠定了坚实的基础。

关键词：石油地质 Termit盆地地质特征主控因素油气富集

Implementation of Online Teaching Behavior Analysis System

在线全文

学校读者我要写书评

暂无评论

国际计算机前沿大会会议论文集 2021年第2期 399-409页

作者： Xu Zhao changwei chen Yongquan Li College of Information Engineering Nanjing Xiaozhuang UniversityNanjing 211171China

Online teaching is gradually spreading widely,but there are problems in online teaching evaluation,such as lack of reference index,students’learning state feedback being hard to get in real-time.To improve online teaching quality and evaluation,a classroom behavior analysis and evaluation system based on deep learning face recognition technology is proposed.This system conducts the model training and tests on the deep learning development framework(TensorFlow).It implements the frame image processing through the Mask R-CNN network,extracts the skeleton and the angle direction information to establish the vector,thus carries out the classroom behavior recognition and analysis,and serves as the appraisal important index.The behavior analysis is made and the results show that the recognition rate is high and the learning situation feedback is given in real time.The experiment shows that the system has certain robustness and high accuracy in the real scene.It is convenient for classroom teaching management and implementation,and is helpful to improve the teaching quality.

关键词： Teaching evaluation Behavior analysis Deep learning Image processing Face recognition

断陷湖盆细粒区页岩组构特征与页岩油富集成藏规律:以黄骅坳陷古近系为例

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中南大学学报（自然科学版） 2024年第3期55卷 994-1007页

作者：蒲秀刚付永强时战楠柴公权陈长伟姜文亚韩文中鄢继华官全胜许静董姜畅中国石油大港油田公司天津300280 中国石油大学(华东)地球科学与技术学院山东青岛266580

为明确断陷湖盆细粒区页岩微观组构特征及页岩油富集成藏规律,基于黄骅坳陷古近系孔二段、沙三段、沙一段3套页岩层系取心、测井、录井及试油等资料,综合利用矿物分析-场发射扫描电镜、氩离子抛光-场发射扫描电镜、聚焦离子束-场发射扫... 详细信息

为明确断陷湖盆细粒区页岩微观组构特征及页岩油富集成藏规律,基于黄骅坳陷古近系孔二段、沙三段、沙一段3套页岩层系取心、测井、录井及试油等资料,综合利用矿物分析-场发射扫描电镜、氩离子抛光-场发射扫描电镜、聚焦离子束-场发射扫描电镜等技术手段,针对页岩样品开展多尺度、多维度精细表征,从微观、定量的角度系统分析了页岩矿物、有机质、孔隙及页岩油赋存特征,揭示了页岩油成藏富集规律并建立了富集模式。研究结果表明:在微观视域下,多类型矿物以“组分混合”和“组构叠置”构成复杂页岩类型;储集空间可划分为无机孔隙、有机孔隙和微裂缝3大类9小类,其中无机孔隙贡献率平均可达85%以上,孔径<50 nm的孔隙占据储集空间的主体;微观上有机质可划分为同沉积有机质、交生分异有机质和运移充填有机质3种类型;烃类主要赋存于长英质纹层、灰云质纹层或粉砂岩纹层中。基于矿物、有机质、储集空间、烃类4个要素的“四元耦合”页岩油富集成藏规律,建立了3类富集成藏模式。在该模式指导下,沧东凹陷孔二段实施多口水平井获高产,优质页岩油区块已经实现当今油价下的效益开发,歧口凹陷沙三段及沙一下亚段页岩油均获得重要突破,展示出黄骅坳陷古近系页岩油具有广阔的资源前景。

关键词：页岩油孔店组二段沙河街组三段沙河街组一段黄骅坳陷组构特征富集成藏规律