检索结果-南通市图书馆

Chinese Journal of Chemistry 2024年第8期42卷 846-852页

作者： Ting chen Wei Feng Ruitong Yang shanping chen Guo-Jun Deng Key Laboratory for Green Organic Synthesis and Application of Hunan Province Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of EducationCollege of ChemistryXiangtan UniversityXiangtanHunan411105 China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiangHunan453007 China

Comprehensive Summary,A convenient approach for the construction of 2-aminobenzothiazoles via I2-catalyzed tandem cyclization reaction of amines and carbon disulfide has been *** present approach starts from simple and readily available starting materials,affording a series of 2-aminobenzothiazoles in up to 89%yields under metal-free *** this work,C—H/N—H functionalization was achieved and multiple C-hetero bonds were successfully constructed in one pot.

关键词： Sulfur heterocycles C-H functionalization Cyclization Tandem reaction Transition-metal-free Amines lodine N-Heterocycles

Chemoselective synthesis of α-carboline derivatives via hypervalent iodine-catalyzed [3+3] annulation under metal-free conditions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green Synthesis and Catalysis 2024年第2期5卷 112-116页

作者： Shuowen Wang Rong Li shanping chen Guojiang Mao Wen Shao Guo-Jun Deng Key Laboratory for Green Organic Synthesis and Application of Hunan Province Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of EducationCollege of ChemistryXiangtan UniversityXiangtan 411105China Department School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

A strategy for the synthesis ofα-carboline derivatives from indole-3-carboxaldehydes and 3-aminocyclohex-2-enones under metal-free conditions has been *** combination use of phenyliodine(Ⅲ)diacetate(PIDA)and benzoic acid could significantly facilitate the corresponding[3+3]annulation *** newly developed strategy featured unextraordinary chemoselectivity,good functional group tolerance and the preservation of the carbonyl group of the ketone substrates,which offers the possibility for further transformation of the products.

关键词： Hypervalent iodine-catalysis Annulation Metal-free α-Carboline Chemoselectivity

煤粉锅炉协同处置油泥过程中NO_(x)和SO_(x)的排放特性研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

锅炉技术 2024年第5期55卷 26-33页

作者：陈善平吴曰丰陈勇袁国安杨智棋尹丽洁同济大学机械与能源工程学院上海200092 上海清宁环境规划设计有限公司上海200051 上海城投老港基地管理有限公司上海200137

油泥中含有大量的S、N等污染物,采用煤粉锅炉协同处置油泥时,需要考虑协同处置对NO_(x)和SO_(x)生成的影响.首先对3种油泥样品进行固定床燃烧小试试验研究,得到了油泥的燃烧速率等基本燃烧特性和NO_(x)、SO_(x)等燃烧污染物排放特性,其... 详细信息

油泥中含有大量的S、N等污染物,采用煤粉锅炉协同处置油泥时,需要考虑协同处置对NO_(x)和SO_(x)生成的影响.首先对3种油泥样品进行固定床燃烧小试试验研究,得到了油泥的燃烧速率等基本燃烧特性和NO_(x)、SO_(x)等燃烧污染物排放特性,其次通过敏感性分析和生成速率分析,结合基于误差传播的直接关系图解法建立了简化的煤粉炉协同处置油泥的NO_(x)、SO_(x)反应机理模型,包括36种组分132个反应,并耦合300MW四角切圆煤粉锅炉协同处置含油污泥的燃烧过程的数值模拟,预测了油泥协同处置量对NO_(x)与SO_(x)生成的影响.研究发现:NO及SO_(2)主要来自燃料,同时受温度、O_(2)浓度和还原性基元的影响;协同处置油泥时NO生成量的变化主要受温度影响,协同处置量为3%时,炉膛出口处NO的平均浓度低于纯煤粉燃烧;炉膛出口处SO_(2)的平均浓度随着协同处置量的增加而增加.研究结果为预测煤粉炉协同处置油泥时污染物的生成奠定基础.

关键词：油泥煤粉炉 NO_(x) SO_(x) 数值模拟

Formation of the Looming-evoked Innate Defensive Response during Postnatal Development in Mice

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2022年第7期38卷 741-752页

作者： shanping chen Huiying Tan Zhijie Wang Yu-ting Tseng Xiaotao Li Liping Wang Shenzhen Key Lab of Neuropsychiatric Modulation Guangdong Provincial Key Laboratory of Brain Connectome and BehaviorCAS Key Laboratory of Brain Connectome and Manipulationthe Brain Cognition and Brain Disease InstituteShenzhen Institute of Advanced TechnologyChinese Brain Science-ShenzhenFundamental Research InstitutionsAcademy of SciencesShenzhen-Hong Kong Institute of Shenzhen 518055China Department of Brain and Cognitive Sciences MeGovern Institute forBrain ResearchMassachusetts Institute of TechnologyCambridgeMA 02139USA University of Chinese Academy of Sciences Beijing 100049China

Environmental threats often trigger innate defensive responses in ***,the gradual development of functional properties of these responses during the postnatal development stage remains ***,we report that looming stimulation in mice evoked fight behavior commencing at P14-16 and had fully developed by *** visual-evoked innate defensive response was not significantly altered by sensory deprivation at an early postnatal ***,the percentages of wide-field and horizontal cells in the superior colliculus were notably elevated at *** findings define a developmental time window for the formation of the visual innate defense response during the early postnatal period and_provide important insight into the underlying mechanism.

关键词： Innate defensive response Postnatal stage Superiorcolliculus

In situ electron-induced reduction of NOx via CNTs activated by DBD at low temperature

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2020年第2期14卷 87-96页

作者： Weixuan Zhao Liping Lian Xingpeng Jin Renxi Zhang Gang Luo Huiqi Hou shanping chen Ruina Zhang Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3) Institute of Environmental ScienceFudan UniversityShanghai 200433China National Engineering Laboratory for VOCs Pollution Control Material&Technology University of Chinese Academy of SciencesBeijing 100049China Shanghai Institute for Design&Research on Environmental Engineering Shanghai 200232China

In this study,a new in situ electron-induced process is presented with carbon nanotubes(CNTs)as a reduction agent activated by dielectric barrier discharge(DBD)for nitrogen oxide(NOx)abatement at low temperature(<407 K).Compared with a single DBD system and a DBD system with activated carbon(DBD-AC),a DBD system with carbon nanotubes(DBD-CNT)showed a significant promotion of NOx removal efficiency and N2 *** the 02 content was 10%,the NOv conversion and N2 selectivity in the DBD-CNT system still reached 64.9%and 81.9%at a specific input energy(SIE)of 1424 J^L,and these values decreased to 16.8%,31.9%and 43.2%,62.3%in the single DBD system and the DBD-AC system,respectively.X-ray photoelectron spectroscopy(XPS)and scanning electron microscopy(SEM)were utilized to investigate surface changes in the CNTs after activation by DBD to explore the NO.t reduction abatement mechanism of this new ***,the outlet gas components were also observed via Fourier transform infrared spectroscopy(FTIR)to help reveal the NOr reduction *** results verified that carbon atoms excited by DBD and the structure of CNTs contributed to the synergistic activity of the DBD-CNT *** new deNOx process was accomplished through in situ heterogenetic reduction reactions between the NOx and carbon atoms activated by the plasma on the *** addition,further results indicated that the new deNOv process exhibited acceptable S02 tolerance and water resistance.

关键词： Dielectric barrier discharge NOx abatement In situ electron-induced reduction Carbon nanotubes

Metal-Free Synthesis of Benzo[a]phenanthridines from Aromatic Aldehydes,Cyclohexanones,and Aromatic Amines

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2022年第3期40卷 365-370页

作者： Pingyu Jiang Zhifei Shan shanping chen Quanyuan Wang Shuxin Jiang Haolin Zheng Guo-Jun Deng Key Laboratory for Green Organic Synthesis and Application of Hunan Province Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of EducationCollege of ChemistryXiongtan UniversityXiangtanHunon 411105China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates(South China University of Technology) GuangzhouGuangdong 510640China

A three-component synthesis of benzo[a]phenanthridines from aromatic aldehydes,cyclohexanones,and aromatic amines has been developed,which is mediated by KI/DMSO/camphorsulfonic acid to afford a variety of functionalized benzo[a]phenanthridines in satisfactory *** present strategy provides a biaryl motif ortho to the nitrogen atom which has the potential to be used as ligand by further *** the advantages of readily available starting materials,transition-metal-free conditions,gram-scale synthesis,and broad substrate scope,this three-component protocol provides an efficient approach for the preparation of diverse benzo[a]phenanthridines.

关键词： Nitrogen heterocycles Multicomponent reactions Dehydroaromatization Cyclization Metal-free

Conversion of NO with a catalytic packedbed dielectric barrier discharge reactor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2017年第11期19卷 67-74页

作者： Xu CAO Weixuan ZHAO Renxi ZHANG Huiqi HOU shanping chen Ruina ZHANG Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention （LAP^3） Institute of Environmental Science Fudan University Shanghai 200433 People＇s Republic of China Shanghai Institute for Design ＆ Research on Environmental Engineering Shanghai 200232 People＇s Republic of China

This paper discusses the conversion of nitric oxide（NO） with a low-temperature plasma induced by a catalytic packed-bed dielectric barrier discharge（DBD） reactor. Alumina oxide（Al2O3）,glass（SiO2） and zirconium oxide（ZrO2）, three different spherical packed materials of the same size, were each present in the DBD reactor. The NO conversion under varying input voltage and specific energy density, and the effects of catalysts（titanium dioxide（TiO2） and manganese oxide（Mn Ox） coated on Al2O3） on NO conversion were investigated. The experimental results showed that NO conversion was greatly enhanced in the presence of packed materials in the reactor, and the catalytic packed bed of Mn Ox/Al2O3 showed better performance than that of TiO2/Al2O3. The surface and crystal structures of the materials and catalysts were characterized through scanning electron microscopy analysis. The final products were clearly observed by a Fourier transform infrared spectrometer and provided a better understanding of NO conversion.

关键词： dielectric barrier discharge materials catalysts NO electrical field

在线全文

学校读者我要写书评

暂无评论

新场气田气井常见堵塞及防治措施

天然气工业 2005年第3期25卷 138-140页

作者：陈单平中国石化西南分公司川西采输处

川西新场气田投入开发以来出现的堵塞现象较多,文章对新场气田常见堵塞类型进行了总结,并通过对完井测试工艺、储层压裂改造、气井生产动态、气井维护措施的研究,分析了形成各种堵塞的原因。认为新场气田上沙溪庙组气井具备形成蜡堵、... 详细信息

川西新场气田投入开发以来出现的堵塞现象较多,文章对新场气田常见堵塞类型进行了总结,并通过对完井测试工艺、储层压裂改造、气井生产动态、气井维护措施的研究,分析了形成各种堵塞的原因。认为新场气田上沙溪庙组气井具备形成蜡堵、水合物堵、压裂液堵的物质条件和物理条件,采气管柱内的粘附节流作用是引起温度、压力突变的主要原因,管内节流最终导致水合物生成和蜡质析出,致使堵塞物多样化;堵塞的发生主要为管内不清洁所致。无论井下还是地面系统,堵塞防治都应立足于井筒或管内净化,在气井建井和开采过程中都应加以考虑。并针对上沙溪庙组气井不同作业阶段提出了相应的堵塞防治措施,对于冬季较普遍的采气外管水合物堵塞采用反吹清管是最为经济有效的。

关键词：气井新场气田水合物采气测试工艺压裂改造完井上沙溪庙组物理条件川西

Iron-catalyzed indolo[2,3-c]quinoline synthesis from nitroarenes and benzylic alcohols/aldehydes promoted by elemental sulfur

在线全文

学校读者我要写书评

暂无评论

Green Synthesis and Catalysis 2022年第1期3卷 95-101页

作者： Rong Li Shuxin Jiang Haolin Zheng Hanwen Lei Zhi Huang shanping chen Guo-Jun Deng Key Laboratory for Green Organic Synthesis and Application of Hunan Province Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of EducationCollege of ChemistryXiangtan UniversityXiangtan 411105China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates(South China University of Technology) Guangzhou 510640China

An iron-catalyzed strategy for the rapid synthesis of indolo[2,3-c]quinolines has been *** cascade reaction involving alcohol oxidation,nitro reduction,and oxidative annulation was achieved in a *** present protocol was started from mono-functionalized indoles and readily available benzylic alcohols/aldehydes,affording a variety of functionalized indolo[2,3-c]quinolines in satisfactory yields.

关键词： Iron-catalyzed Nitro reduction Alcohol oxidation Oxidative annulation Indolo[2,3-c]quinolines

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于累积缺陷原则构建的衰弱指数及其应用

中华老年多器官疾病杂志 2024年第3期23卷 229-232页

作者：任燕杨永学陈善萍郑晓梅严雪丹周莉华成都市第五人民医院·成都中医药大学附属第五人民医院·第二临床医学院老年医学科成都611137 成都市第五人民医院·成都中医药大学附属第五人民医院·第二临床医学院成都市老年疾病研究所·成都市肿瘤防治所成都611137

衰弱是因机体生理储备和应激适应能力下降和失调而易发生不良结局的临床状态或综合征。目前,关于衰弱的评估方法尚无金标准,但有研究发现基于累积缺陷原则构建的衰弱指数模型对各种不良临床事件的预测能力高于其他衰弱评估方法。本文主... 详细信息

衰弱是因机体生理储备和应激适应能力下降和失调而易发生不良结局的临床状态或综合征。目前,关于衰弱的评估方法尚无金标准,但有研究发现基于累积缺陷原则构建的衰弱指数模型对各种不良临床事件的预测能力高于其他衰弱评估方法。本文主要对基于累积缺陷原则构建的衰弱指数及其构建方法、常见种类及其应用等方面的相关研究进行综述,为衰弱评估提供新思路和新方法。

关键词：老年人衰弱衰弱指数累积缺陷衰弱评估工具