检索结果-南通市图书馆

Geometric and defects engineering collaboration for enhanced cascade enzymatic nanoreactors

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 2451-2461页

作者： Zhichao Yu Ruijin Zeng Hexiang gong Yuan Gao shuyun Chen Yunsen Wang Dianping Tang Key Laboratory for Analytical Science of Food Safety and Biology(MOE&Fujian Province) Department of ChemistryFuzhou UniversityFuzhou 350108China

Highly evolved multi-enzyme cascade catalytic reactions in organisms facilitate rapid transfer of substrates and efficient conversion of intermediates in the catalytic unit,thus rationalizing their efficient *** this study,pore-ordered mesoporous single-atom(Fe)nitrogen-doped carbon nanoreactors(Mp-Fe-CN)were designed,in which a reasonable pore size was designed as a natural enzyme trap coupled to a simulated enzyme center.A polarity-mediated strategy was developed to obtain atomically dispersed nanoporous substrates,with the finding that polarity-guided engineering of the nitrogen-ligand environment and vacancy cluster defects clearly affects nanoporous activity,accompanied by appreciable mesoporous pore size *** active center and distal N atom coordination of Fe-N_(4) affect the catalytic process of the nanozyme exposed by density functional theory(DFT),determining the contribution of hybridized orbitals to electron transfer and the decisive step.A cascade nanoreactor-based domain-limited sarcosine oxidase developed for non-invasive monitoring of sarcosine levels in urine for evaluation of potential prostate carcinogenesis as a proof of *** on the design of surface mesoporous channels of nanocatalytic units,a bridge was built for the interaction between nanozymes and natural enzymes to achieve cascade nanocatalysis of natural enzymatic products.

关键词： nanozyme single-atom catalyst bioreactor cascade catalysis non-Invasive sensing

Silurian Seismites in Hanxia,Yumen,North Qilian Mountains,and Their Tectonic Significance

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

Acta Geologica Sinica(English Edition) 2001年第4期75卷 385-390页

作者： DU Yuansheng, gong shuyun, HAN Xin, WANG Jiasheng, GU Songzhuand LIN Wenjiao Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, Hubei China Univ Geosci Fac Earth Sci Wuhan 430074 Peoples R China

The Caledonian orogenic belt of the North Qilian Mountains is an intensely active structure belt. In the process of the Late Caledonian syn-orogeny, the North Qilian-Hexi Corridor area was situated on the tectonic background of a syn-orogenic basin. In response to the orogenic process of the North Qilian Mountains, typical earthquake event deposits—seismites of the Silurian were widely distributed around Hanxia of Yumen City, the Liyuan River of Sunan County and Biandukou of Minle County. In the Hanxia area, where seismites are typically developed, clastic deposits of tidal-flat facies are the background deposits of the Hanxia Formation. The earthquake event deposits are characterized by sandy mudstone veins, synsedimentary microfractures, micro-corrugated laminations and earthquake breccias, which in turn constitute complex seismites, featuring seismic corrugation, shattering and liquefied sandy mudstone veins, auto-clastic breccias and intraclastic parabreccias. The seismites and tidal flat deposits formed typical sequences of earthquake event deposits.

关键词： Gansu Province North Qilian orogenic belt Caledonian Stage Silurian seismites earthquake event deposits

On Evolutionary Sequence Systematics: Taking Permian Waagenophylloid Coral Fauna as an Example

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 1999年第3期18卷 215-227页

作者： Xu Guirong gong shuyun Wang Yongbiao(Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074) Faculty of Earth Sciences China University of Geosciences Wuhan 430074

Evolutionary sequence systematics is a discipline in paleontology and biology that deals with phylogeny of organism, the main purpose of which is to understand relatives between species and taxa and to show their evolutionary sequence. The systematics is set up on the phenetic-cladistic systematics. A number of important theoretical concepts in the cladistics are added the concept of time in the systematics. For example, the time-span between the closest sister species is considered limited in the duration of their mother species. The foundational methodology of the systematics is to analyze sister-group and character mosaic distribution, and the key to study evolutionary sequence is to understand cbaracter mosaic distribution fully. These aualyses can be executed by using computer. In the paper, the Permian Waagenophylloid coral fauna is taken as an example to illustrate the analysis on evolutionary sequence. These coral fossils are widespread in Tethyan *** characters and a number of cbaracter states for each character used in study result from features of Waagenophylloid corals. According to principles of tbe widest distribution of character states, fossil records and ontogenesis we discerned plesiomorph character states for each character. Characters are divided into 4 ranks on the basis of their important place in pkylogeny. Based on the theory and methopology of tbe evolutionary sequence systematics the paper analyzes the sister groups and evolutionary sequence. In the examination each other between the analyses of sister groups and evolutionary sequence tbe paper found many importunt phenomena of paleontology,such as character degeneration, parallel evolution, and polydirectional clades, and distinguished a number of abnormal order. Iu the discussion to test tke rirst occurrence event8 of biostratigraphy we infer the Possible stratigraphic levels of some fossils.

关键词： evolutionary sequence systematics character mosaic distribution Permian Waagenophylloid corals

FROM BACK-ARC BASIN TO BACK-ARC FORELAND BASIN—THE SEDIMENTARY BASIN AND TECTONIC EVOLUTION OF THE LATE CALEDONIAN—EARLY HERCYNIAN STAGES IN CORRIDOR AND NORTH QILIAN MTS

在线全文

学校读者我要写书评

暂无评论

地学前缘 2000年第S1期7卷 252-253页

作者： Du Yuansheng, gong shuyun, Han Xin, Wang Jiasheng, Hou Guangjiu(Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074,China)

Qilian orogenic belt is a typical orogenic belt formed by polycyclic collisions between the North China plate and Qaidam microplate. Qilian ocean originated from the rift of the late Proterozoic Rodinia continent(Pangea\|850), evolved through rift basin and became an archipelagic ocean in the Caledonian stage. The Lower Proterozoic strata in Qilian area are mid\|high\|rank metamorphic rocks that constitute the metamorphic basement of the area. The “Huangyuan Movement" (in South Qilian and Central Qilian) and "Alashan Movement" (in North Qilian) in the latest Late Proterozoic formed a regional unconformity. The middle Proterozoic in the area are mudstones and carbonate rocks with stromatolites and ooids. The Qingbaikou System of the upper Proterozoic in the North Qilian and Corridor region is also mudstone and carbonate rock with stromatolites. The Qingbaikou System in Central Qilian is sandstones and mudstones. There are alkaline and tholeiite in the Sinian System in North Qilian and Corridor. The contact between Qingbaikou System and Sinian System is a regional unconformity (Quanji Movement). Qilian ocean began to rift away in Caledonian tectonic stage on the Pre\|Sinian basement.

关键词： sedimentary basin tectonic evolution late Caledon ian early Hercynian North Qilian Mts. Corridor

在线全文

学校读者我要写书评

暂无评论

罗湖断裂带地应力场三维有限元模拟分析

岩石力学与工程学报 2006年第Z2期25卷 3898-3903页

作者：马淑芝贾洪彪易顺民龚淑云武汉理工大学土木工程与建筑学院湖北武汉430070 中国地质大学工程学院湖北武汉430074 深圳市地质局广东深圳518028

罗湖断裂带位于深圳—五华断裂带的南西段,由13条NE向断层和6条NW向断层组成,断裂分布密集。该断裂带位于深圳市区,周围高楼林立,其中的F8断裂被证实为活断层并于1994年曾有过异常活动,因而对于该断裂带的构造活动性进行研究意义重大。... 详细信息

罗湖断裂带位于深圳—五华断裂带的南西段,由13条NE向断层和6条NW向断层组成,断裂分布密集。该断裂带位于深圳市区,周围高楼林立,其中的F8断裂被证实为活断层并于1994年曾有过异常活动,因而对于该断裂带的构造活动性进行研究意义重大。在对罗湖断裂带地质特征研究的基础上,建立起三维地质模型,采用弹塑性有限元法对断裂带地应力场进行数值模拟。根据模拟结果,分析罗湖断裂带地应力的分布特征、断层存在对地应力场的影响,并在此基础上对断裂带的构造稳定性进行分析。研究表明,断裂带的存在对地应力大小、方向、连续性、应力集中程度有明显影响;局部位置存在塑性破坏区,构造稳定性稍差,存在进一步活动的趋势,尤以F8,F9断裂北西段为甚。由于塑性破坏的发生会导致应力某种程度的释放,从而使应力集中程度较低,断层的活动将以蠕滑方式为主,不足以形成中强地震。

关键词：数值分析罗湖断裂带三维地质模型有限元地应力场

在线全文

学校读者我要写书评

暂无评论

进化序列系统学——以二叠纪瓦岗珊瑚类为例

地球科学（中国地质大学学报） 2000年第1期25卷 1-10页

作者：徐桂荣龚淑云王永标中国地质大学地球科学学院武汉430074

进化序列系统学是古生物学中研究物种间和类别间的系统发育关系为目的的学科 ,包括研究物种或类别间的亲缘关系 ,并确定它们形成的先后序列 .表型 -分支系统学是该系统学的基础 .分支系统学的许多重要概念在该系统学中加入了时间的含义 ... 详细信息

进化序列系统学是古生物学中研究物种间和类别间的系统发育关系为目的的学科 ,包括研究物种或类别间的亲缘关系 ,并确定它们形成的先后序列 .表型 -分支系统学是该系统学的基础 .分支系统学的许多重要概念在该系统学中加入了时间的含义 ,例如 ,认为最亲近的姐妹种之间的时间间隔不会超过它们母种的生存期 .姐妹群和性状镶嵌分析是进化序列研究的主要方法 ,而理解性状镶嵌分布是关键 .这些分析可由计算机程序实现 .以二叠纪瓦岗珊瑚类作为研究进化序列系统学的实例 ,该类在特提斯地区广泛分布 .通过对瓦岗珊瑚类的特征分析确定了 17个性状用于研究 ,并且每一性状确定了几个变化状态 .根据最广布的性状状态、化石记录和个体发生等原则分辨出近祖性状状态 ,并根据性状在系统发育中的重要性确定性状分级 .然后 ,确定了姐妹群间的关系和物种间的进化序列 .在姐妹群与进化序列分析相互检验中可发现性状退化、平行演化和多向分支等古生物学重要现象 ,并分辨出物种的异常顺序 .在检验生物地层学首次出现事件讨论中推测了一些化石首次出现的可能层位 .

关键词：进化序列系统学二叠纪瓦岗珊瑚类古动物

为女工立传:女工的历史与“生命力”书写——《中国新工人:女工传记》评析

在线全文

学校读者我要写书评

暂无评论

中华女子学院学报 2019年第1期31卷 111-116页

作者：巩淑云北京大学中国语言文学系

2017年11月吕途书写的“新工人”系列的第三本书《中国新工人:女工传记》由生活·读书·新知三联书店出版。2017年12月16日在三联韬奋书店召开了题为《都市折叠下的新工人》的新书发布会,会上邀请了北京大学的张慧瑜老师和皮村文学小组... 详细信息

2017年11月吕途书写的“新工人”系列的第三本书《中国新工人:女工传记》由生活·读书·新知三联书店出版。2017年12月16日在三联韬奋书店召开了题为《都市折叠下的新工人》的新书发布会,会上邀请了北京大学的张慧瑜老师和皮村文学小组的范雨素进行对谈。

关键词：新工人女工性别阶级传记书写

在线全文

学校读者我要写书评

暂无评论

交通荷载下软土的变形及微结构演化特征

深圳大学学报（理工版） 2018年第4期35卷 398-404页

作者：马剑飞龚淑云李向全卢薇艳中国地质科学院水文地质环境地质研究所河北石家庄050061 深圳市地质局广东深圳518023

为探讨交通荷载作用下软土变形特征及微结构演化,对中国深圳前海地区软土进行动三轴试验,并将试验后的土样进行微结构制样及电镜扫描,解释动三轴试验中土样的变形机理.动三轴和微观结构测试结果表明,临界动应力比随试验条件而变化,围压... 详细信息

为探讨交通荷载作用下软土变形特征及微结构演化,对中国深圳前海地区软土进行动三轴试验,并将试验后的土样进行微结构制样及电镜扫描,解释动三轴试验中土样的变形机理.动三轴和微观结构测试结果表明,临界动应力比随试验条件而变化,围压增加,软土临界动应力比减小,振动频率增加,临界动应力比增加.当动应力比小于临界动应力比时,随着动应力比增加,孔隙受到压缩而趋于扁平化,累积轴向应变增加.而相同动应力比条件下,轴向应变随振动频率增加而减小,随有效固结围压增加而降低.超过临界动应力比后,土体原结构发生破坏,颗粒重新排列导致孔隙普遍加大,孔隙扁平化加剧.

关键词：土力学软土动荷载轴向应变微观结构动三轴试验

在线全文

学校读者我要写书评

暂无评论

双转子连续混炼机混炼段相似放大初探

中国塑料 2011年第6期25卷 102-107页

作者：李建立龚树云马玉录谢林生华东理工大学机械与动力工程学院上海200237

基于几何相似准则,分别对3种混炼段构型进行了2倍和10倍放大,用Polyflow软件对放大前后的混炼段流场进行了模拟研究,以1个旋转周期内不同横截面上的平均压力和平均混合指数、物料在混炼段的停留时间分布、混炼段出口截面上的解聚功率密... 详细信息

基于几何相似准则,分别对3种混炼段构型进行了2倍和10倍放大,用Polyflow软件对放大前后的混炼段流场进行了模拟研究,以1个旋转周期内不同横截面上的平均压力和平均混合指数、物料在混炼段的停留时间分布、混炼段出口截面上的解聚功率密度和修正Lyapunov指数的累积概率函数、比能耗、扭矩和轴向力等为评价指标,分析了几何相似放大对流场特征、混合效果、能耗等的影响。结果表明,采用几何相似准则对不同构型的混炼段进行放大时,在转速不变的情况下,产量均可按几何放大倍数的3次方放大,而混炼段流场特征、混合效果及比能耗保持不变,混炼段转子所受的轴向力和扭矩分别按几何放大倍数的平方和立方增大;在进一步的放大设计中需兼顾热平衡相似,以便在高产量下保证塑化品质。

关键词：双转子连续混炼机混炼段构型几何相似放大准则流场模拟