检索结果-南通市图书馆

The Establishment and Development of the System of Scenic Areas of China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国园林 2012年第11期28卷 9-10页

作者： WANG bing-luo

Vortical structures and density fluctuations analysis of supersonic forward-facing step controlled by self-sustaining dual synthetic jets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2020年第6期36卷 1215-1227,I0002页

作者： Qiang Liu Zhen-bing luo Xiong Deng Yan Zhou Lin Wang Pan Cheng College of Aerospace Science and Engineering National University of Defense TechnologyChangsha410073China

Shock wave/boundary layer interaction(SWBLI)is still one of the unresolved bottlenecks that restrict the development of more advanced flight *** forward-facing step(FFS),an extreme case of compression ramp,often occurs severe SWBLIs with a large separation *** this paper,experimental investigations on vortical structures and density fluctuations characteristics of supersonic FFS controlled by self-sustaining dual synthetic jets(SDSJ)are carried out in a Mach number 2.95 wind *** spatial–temporal resolution flowfield images of FFS without/with active flow control are captured by adopting nano-particle-based planar laser scattering *** control effects of the distance between the actuator and the step are mainly *** paper finds that the SDSJ can effectively change the feature of flowfield,eliminate the separation shock and the reattachment shock,compel the original shock induced by the step leading edge to distort and reduce its intensity *** fluctuations analysis demonstrates that the whole flows seem to move upstream with the increase of distance(dS-J).Discrete Fourier transformation spectrums results reveal that the fluctuations are mainly located in the low-frequency region at ***-frequency components and frequency bandwidth increase slightly after the SDSJ are applied.

关键词： Forward-facing step Self-sustaining dual synthetic jets Flow control Fine structures Density fluctuations

Corrosion evolution and behaviour of Al-2.1Mg-1.6Si alloy in chloride media

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2021年第4期40卷 908-919页

作者： Ya-Ya Zheng bing-Hui luo Chuan He Yang Gao Zhen-Hai Bai College of Materials Science and Engineering Central South UniversityChangsha 410083China Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha University of Science and TechnologyChangsha 410114China

Owing to the importance of finding better methods and technologies for protecting against corrosion of aluminium alloys,research into the electrochemical characteristics of the corrosion is an ongoing *** this paper,the corrosion behaviour of Al-Mg-Si alloys in 3.5 wt% NaCl solution was investigated using multiple methods,including scanning electron microscopy(SEM),transmission electron microscopy(TEM),potentiodynamic polarisation measurement and electrochemical impedance spectroscopy(EIS).The results suggest that corrosion begins with dealloying of Mg,followed by conversion of MgSi particles into Al-Fe-Mn-Si *** corrosion rate increased until it reached a peak and then *** increase in the corrosion rate may be attributed to an increased electrochemical driving force,which is produced by anodic dissolution between the matrix and residual MgSi ***,the thin re-deposited layer of inert elements also plays an important role in accelerating the anodic process of the corrosion *** passivated corrosion pit and narrowed intergranular corrosion(IGC)pathway cause the area of active dissolution to decrease,thus reducing the corrosion rate.

关键词： Al-Mg-Si alloys Corrosion behaviour Electrochemical Corrosion rate IGC corrosion pathway

Strengthening and toughening mechanism of a Cu-bearing high-strength low-alloy steel with refined tempered martensite/bainite(M/B)matrix and minor inter-critical ferrite

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2021年第4期28卷 464-478页

作者： Fei Zhu Feng Chai Xiao-bing luo Zheng-yan Zhang Cai-fu Yang Department of Structural Steels Central Iron and Steel Research InstituteBeijing 100081China

The microstructure–mechanical property relationship of a Cu-bearing low-carbon high-strength low-alloy steel,subjected to a novel multistage heat treatment including quenching(Q),lamellarization(L)and tempering(T),is *** strength of 989.5 MPa and average toughness at-80℃of 41 J were obtained in this steel after quenching and tempering(QT)heat *** QLT gained a little lower yield strength(982.5 MPa),but greatly enhanced average toughness at-80℃(137 J).To further clarify the strengthening and toughening mechanisms in specimen QLT,parameters of microstructural characteristic and crack propagation process were compared and analyzed for specimens Q,QL,QT and *** microstructure of tempered martensite/bainite(M/B)in specimen QT changed to refined tempered M/B matrix mixed with minor IF(inter-critical ferrite)in specimen ***-rich precipitates existed in tempered M/B for both specimens QT and QLT,as well as in *** with QT,adding a lamellarization step before tempering made the effective grains of specimen QLT refined and also led to coarser Cu-rich precipitates in tempered M/B *** weaker strengthening effect of coarser Cu-rich precipitates should be a key reason for the slightly lower yield strength in specimen QLT than in specimen *** austenite was found in all specimens Q,QL,QT and *** QLT showed purely ductile fracture mode at-80℃due to the refined effective *** greatly improved toughness is mainly attributed to the enhanced energy of crack *** combination of refined microstructure,softened matrix and deformation of minor'soft'IF during crack propagation led to the most superior toughness of specimen QLT among all specimens.

关键词： High-strength low-alloy steel Multistage heat treatment Low-temperature toughness Strengthening mechanism Grain refinement Crack propagation

梁平地区二叠系长兴组台缘礁滩储层演化——来自天东110井岩石学及地球化学证据

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

断块油气田 2024年第5期31卷 810-819页

作者：沙宇涵张云峰罗冰刘菲陈守春罗妮娜刘冬玺易娟子李开放西南石油大学地球科学与技术学院四川成都610500 天然气地质四川省重点实验室四川成都610500 油气藏地质及开发工程全国重点实验室四川成都610500 中国石油西南油气田分公司重庆气矿重庆400021

天东110井是川东地区长兴组近年来获得的高产稳产井之一,该井的不同类型储层成因研究及模式建立对梁平地区长兴组勘探具有重要指示作用。基于天东110井长兴组丰富的取心资料,文中对其开展了岩石学、地球化学分析,建立了不同储集空间的... 详细信息

天东110井是川东地区长兴组近年来获得的高产稳产井之一,该井的不同类型储层成因研究及模式建立对梁平地区长兴组勘探具有重要指示作用。基于天东110井长兴组丰富的取心资料,文中对其开展了岩石学、地球化学分析,建立了不同储集空间的演化模式,提出了高产井储层分布模式。结果表明:1)天东110井长兴组发育孤立状洞、溶洞、孔隙(包括针状孔及晶间孔)、高角度构造溶蚀缝。2)天东110井长兴组针状孔分布于礁滩体的颗粒云岩中,准同生期大气淡水溶蚀成孔、渗透回流白云岩化起关键保孔作用。3)缝洞形成受晚三叠世诺利期地层水溶蚀及瑞提期热液溶蚀作用控制,前者被沥青及巨晶方解石全充填,储集性能较差,后者部分被方解石、白云石、萤石等充填,充填程度低,孔渗性能好。下一步勘探应注重台地边缘的白云岩礁滩体微地貌高点与近晚三叠世瑞提期断裂及裂缝的热液溶蚀叠合发育区,可望获得更大突破。

关键词：储层成因储层演化礁滩体台地边缘天东110井长兴组上二叠统梁平地区

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

刺梨果实转化酶提取方法比较及酶学特性分析

中国南方果树 2024年第4期53卷 157-163页

作者：黄亚成何斌胡晓莎苏龙兴罗炳刘林娅六盘水师范学院生物科学与技术学院贵州六盘水553004

刺梨(Rosa roxburghii Tratt.)果实转化酶(蔗糖酶)通过调控蔗糖分解影响果实的生长发育和品质形成。提取方法能够影响植物转化酶的提取效率和活性。以“贵农7号”刺梨花后45 d的果实为材料,比较了液氮研磨样品和提取液冰上研磨样品下6... 详细信息

刺梨(Rosa roxburghii Tratt.)果实转化酶(蔗糖酶)通过调控蔗糖分解影响果实的生长发育和品质形成。提取方法能够影响植物转化酶的提取效率和活性。以“贵农7号”刺梨花后45 d的果实为材料,比较了液氮研磨样品和提取液冰上研磨样品下6种提取转化酶方法的效果,探究了可溶性转化酶的酶学特性。结果表明,液氮研磨法对刺梨果实转化酶活性影响较大,其中可溶性酸性转化酶(soluble acid invertase,SAI)活性丧失严重,而细胞壁酸性转化酶(cell wall-bound invertase,CWI)和中碱性转化酶(neutral or alkaline invertaes,N/A-INV)均无活性。采用提取液冰上研磨样品,用Hepes-NaOH法提取刺梨果实转化酶的效果最好,SAI、CWI和N/A-INV的活性最高,分别为3.16、2.09和2.09μmol/(g·h),磷酸钠法次之,且Hepes-NaOH法提取的可溶性转化酶(SAI和N/A-INV)的比活性最高。酶学特性分析表明,SAI的最适温度为60℃,最适pH值为4.5~5.0,Km值为87.15 mmol/L;N/A-INV的最适温度为45~50℃,最适pH值为8.5,K m值为3.46 mmol/L。研究结果为刺梨果实转化酶的提取和转化酶生物学功能的深入研究奠定了基础。

关键词：刺梨果实转化酶蔗糖酶提取方法酶学特性

Boosting photocatalytic hydrogen production via interfacial engineering over a Z-scheme core/shell heterojunction

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第1期16卷 352-359页

作者： bing luo Jinghua Li Wei Wang Chaoqian Ai Haihan Zhang Yuxin Zhao Dengwei Jing School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'an 710049China International Research Center for Renewable Energy&State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

Designing high efficacy photocatalysts is a promising way to improve solar fuel production *** this work,we prepared a core/shell composite of loose ZnCr layered double hydroxide nanosheets modified CdS nanorods for efficient visible light driven photocatalytic hydrogen *** highest hydrogen production rate achieved 425.8μmol·h^(−1) without adding any noble metal cocatalyst under the visible light stimulus,which is 22.4 times that of 1 wt.%Pt-modified *** corresponding apparent quantum yield is 13.9%at 420 *** is revealed that the synergistic actions of the interfacial redox shuttle of Cr^(3+)/Cr^(δ+)and the interfacial electric field enable the efficient separation of photoinduced charge carriers between two components via a Z-scheme energy band ***,with the hydrogen evolution contribution of Zn^(2+),a remarkable improvement in photocatalytic performance was achieved in contrast to bare *** work provides an effective methodology to construct highly efficient and economically viable photocatalysts for solar H_(2)production and mechanistic study.

关键词： photocatalysis heterojunction interfacial engineering noble metal free hydrogen production

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

川东地区寒武系洗象池组构造特征及成藏模式

岩性油气藏 2024年第5期36卷 122-132页

作者：邱玉超李亚丁文龙罗冰姚军许强文华国谭秀成西南石油大学地球科学与技术学院成都610500 中国石油西南油气田公司勘探开发研究院成都610041 中国石油勘探开发研究院西北分院兰州730020 成都理工大学沉积地质研究院成都610059

四川盆地东部上寒武统洗象池组是盆地内下组合油气勘探的重点领域。基于地层及沉积演化特征,利用地震、钻井岩心以及地球化学等资料,分析了川东地区上寒武统洗象池组构造特征及变形机制,从源、储、盖、运4个方面分析了其油气成藏条件,... 详细信息

四川盆地东部上寒武统洗象池组是盆地内下组合油气勘探的重点领域。基于地层及沉积演化特征,利用地震、钻井岩心以及地球化学等资料,分析了川东地区上寒武统洗象池组构造特征及变形机制,从源、储、盖、运4个方面分析了其油气成藏条件,并总结了成藏模式。研究结果表明:(1)川东地区寒武系洗象池组表现为以2套滑脱变形带(中寒武统高台组膏盐岩和志留系泥岩)控制的、沿北西向传递的断褶构造,发育背冲构造、叠瓦状构造、断弯褶皱和盐底辟断弯褶皱4种构造圈闭样式;中寒武统高台组膏盐岩和中—下奥陶统泥灰岩2套盖层分别将下寒武统筇竹寺组、上奥陶统五峰组—下志留统龙马溪组2套烃源岩与洗象池组隔离。(2)研究区洗象池组具备油气成藏条件,五峰组—龙马溪组泥页岩是主要烃源岩,厚度为300~700 m,TOC值为2%~7%,生烃能力强,Ro为2.4%~4.0%,处于过成熟阶段;洗象池组沉积后期被岩溶和裂缝改造的滩相白云岩是相对优质的规模较大的储层,孔隙度大于2.1%;燕山期构造抬升和变形不仅在洗象池组形成了有效构造圈闭,还使其突破中—下奥陶统盖层与五峰组—龙马溪组对接,实现了油气的水平侧向运移。(3)研究区洗象池组为“新生古储、源储并置、侧向运移、构造圈闭”晚期天然气成藏模式;逆冲断层导致上盘褶皱的洗象池组与下盘五峰组—龙马溪组在水平面上并置,形成了源-储横向对接的构造圈闭,有效地提高了供烃和成藏的效率。

关键词：构造圈闭变形机制源储侧向对接燕山构造运动逆冲断层滩相白云岩五峰组—龙马溪组洗象池组寒武系川东地区

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

某酒厂新污水处理厂沼气发电项目电气设计

机电工程技术 2024年第6期53卷 277-281页

作者：罗兵刘莉萍王伟费文伟中国市政工程中南设计研究总院有限公司水利设计院成都610066

通过对沼气发电技术进行分析,研究了沼气发电项目中的电气设计要点问题。首先以某酒厂新污水处理厂沼气发电项目为例进行分析,对电气主接线设计要点进行了探讨,研究了设置消弧线圈的必要性,分析了该地安装消弧线圈存在的协同工作问题,... 详细信息

通过对沼气发电技术进行分析,研究了沼气发电项目中的电气设计要点问题。首先以某酒厂新污水处理厂沼气发电项目为例进行分析,对电气主接线设计要点进行了探讨,研究了设置消弧线圈的必要性,分析了该地安装消弧线圈存在的协同工作问题,并给出了解决办法。此外,详细研究了沼气发电项目系统设计中的关键环节,对该项目的发电机主保护、变压器主保护、线路主保护等进行了系统设计,并且设计了计算机监控系统,以便实时监测发电设备的状态、性能参数等信息,及时识别和处置异常情况。研究成果不仅为该项目的优化提供了有效建议,同时也为其他类似工程在电气设计方面提供了有益的参考和指导。

关键词：污水处理沼气发电消弧线圈电气设计