检索结果-南通市图书馆

Changshanian maximum Flooding event in China and Its Global Correlation

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(english edition) 1996年第4期70卷 341-355,451页

作者： m.e.tucker U niverSity of Durhnm.U.K.

Various orders of condensed sections are recognized in the Cambrian of North China Carbonate Platform. Study of comparative sedimentology proves that CS4-CS5 in the Changshanian age is the maximum sea flooding sediments in the Cambrian, regardless of the distribution, thickness, internal structure of the condensed section series and K2O abundance. It is a two-layered composite condensed section series, characterized by the enrichment of such elements as K, P, mn, Ti, Co, V, Cr, Cu, Zr, Ni, Li, Th, La, Ce, Nd, Dy, Y, Sc and Be. The Changshanian maximum flooding event can be correlated on a global scale, and the corresponding sedimentary records are discovered in 26 intercontinental sections in N. europe, N. America, and Tarim and the Yangtze Platform of China. Through detailed sedimentological research, meter-scale cycle analysis and Fischer plots, it is concluded that the Changshanian maximum flooding was a composite effect of the second-order eustacy superimposed by the third-and fourth-order eustacy, which lasted for 1.2-3 ma. An intercontinental model of the Changshanian maximum flooding is proposed at the end of this paper.

关键词： Changshanian age maximum flooding event condensed section global correlation Cambrian

Carbonate sedimentation in a starved pull-apart basin,middle to Late Devonian,southern Guilin,South China

在线全文

学校读者我要写书评

暂无评论

Carbonate sedimentation in a starved pull-apart basin,Middle...

中国晚寒武世长山期最大海泛事件及其全球对比意义

中国科学院地质与地球物理研究所2001学术年会

作者： m.e.tucker Department of Geological Sciences.University of Durham

Geological mapping and sedimentological investigations in the Guilin region,South China, have revealed a spindle- to rhomb-shaped basin filled with Devonian shallow- to deepwater *** Yangshuo Basin is interpreted as a pull-apart basin created through secondary,synthetic strike-slip faulting induced by major NNe-SSW-trending,sinistral strikeslip fault *** fault zones were initially reactivated along intracontinental basement faults in the course of northward migration of the South China *** nearly N-S-trending margins of the Yangshuo Basin,approximately coinciding with the strike of regional fault zones,were related to the master strike-slip faults;the NW-Se-trending margins were related to parallel,oblique-slip extensional *** depositional sequences recognized in Givetian through Frasnian strata can be grouped into three sequence sets(Sequences 1-2,3-5 and 6-9),reflecting three major phases of basin evolution. During basin nucleation,most basin margins were dominated by stromatoporoid biostromes and bioherms,upon a low-gradient *** at the steep,fault-controlled,eastern margin were thick stromatoporoid reefs *** subsequent progressive offset and pull-apart of the master strike-slip faults during the late Givetian intensified the differential subsidence and produced a spindle-shaped *** accelerated subsidence of the basin centre led to sediment starvation,reduced current circulation and increased environmental stress,leading to the extensive development of microbial buildups on platform margins and laminites in the basin *** reefs only survived along the windward,eastern margin for a short *** architectures of the basin margins varied from aggradation(or slightly backstepping) in windward positions(eastern and northern margins) to moderate progradation in leeward positions.A relay ramp was present in the north-west corner between the northern oblique fault zone and the proximal part of

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

地质学报 1996年第2期70卷 108-120,T001页

作者：孟祥化葛铭 m.e.tucker 中国地质大学英国Durham大学

在华北地台寒武-奥陶系层序地层研究中发现了不同层序中的海绿石质凝缩层。长山期最大海泛凝缩层系以富钾海绿右的双层结构复合层系为特征,富集多种金属元素和磷、锰、K_2O为特点。长山期海泛事件具有全球对比意义。笔者已在北欧,北美... 详细信息

在华北地台寒武-奥陶系层序地层研究中发现了不同层序中的海绿石质凝缩层。长山期最大海泛凝缩层系以富钾海绿右的双层结构复合层系为特征,富集多种金属元素和磷、锰、K_2O为特点。长山期海泛事件具有全球对比意义。笔者已在北欧,北美及亚洲26个洲际剖面点发现了长山事件记录。详细的比较沉积学、微相、米级旋回和Fischer图解研究均证明长山期最大海泛事件系起因干二级与三、四级海平面变化周期复合叠加作用,形成时限为1.2-3ma,最后提出长山期全球海泛事件的洲际模式。

关键词：长山期海泛事件凝缩层全球对比寒武纪中国

在线全文

学校读者我要写书评

暂无评论

长山期最大海泛事件及洲际模式研究

科学通报 1995年第9期40卷 818-821页

作者：葛铭孟祥化 m.e.tucker 中国地质大学北京100083 英国达勒姆大学

海泛事件与凝缩层段是当代层序地层学和旋回层序地层学研究热点之一.凝缩层段(Condensed sedion,CS)是厚度很薄的一个海相地层单位,由沉积速率极缓慢的深海相和半深海相沉积物构成,在区域分布上,它们在最大海泛期延伸最为广泛.它是鉴别... 详细信息

海泛事件与凝缩层段是当代层序地层学和旋回层序地层学研究热点之一.凝缩层段(Condensed sedion,CS)是厚度很薄的一个海相地层单位,由沉积速率极缓慢的深海相和半深海相沉积物构成,在区域分布上,它们在最大海泛期延伸最为广泛.它是鉴别最大海泛事件的重要标志.

关键词：凝缩层段寒武系海泛事件层序地层学

在线全文

学校读者我要写书评

暂无评论

沉积岩的野外描述

沉积岩的野外描述

丛书名：基础地质工作方法译丛

1984年

作者：图克尔（m.e.tucker）韩书和译

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

现代和古代湖泊沉积物

现代和古代湖泊沉积物

Polyethylene glycol has immunoprotective effects on sciatic allografts, but behavioral recovery and graft tolerance require neurorrhaphy and axonal fusion

丛书名：书名原文:modern and Ancient Lake Sediments

1984年

作者：马特（A.matter）塔克（m.e.tucker）编李蕙生译

本书共包括了15篇论文涉及到湖泊沉积学的各个方面的内容问题.

ISBN: (纸本)15038·新1054

本书共包括了15篇论文涉及到湖泊沉积学的各个方面的内容问题.

关键词：湖泊沉积物学科:文集

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第4期20卷 1192-1206页

作者： Tyler A.Smith Liwen Zhou Cameron L.Ghergherehchi michelle mikesh Cathy Z.Yang Haley O.tucker JuliAnne Allgood Jared S.Bushman George D.Bittner Department of molecular Biosciences University of Texas at AustinAustinTXUSA Department of Neuroscience University of Texas at AustinAustinTXUSA Division of Pharmaceutical Sciences University of WyomingLaramieWYUSA

Behavioral recovery using(viable)peripheral nerve allografts to repair ablation-type(segmental-loss)peripheral nerve injuries is delayed or poor due to slow and inaccurate axonal ***,such peripheral nerve allografts undergo immunological rejection by the host immune *** contrast,peripheral nerve injuries repaired by polyethylene glycol fusion of peripheral nerve allografts exhibit excellent behavioral recovery within weeks,reduced immune responses,and many axons do not undergo Wallerian *** relative contribution of neurorrhaphy and polyethylene glycol-fusion of axons versus the effects of polyethylene glycol per se was unknown prior to this *** hypothesized that polyethylene glycol might have some immune-protective effects,but polyethylene glycol-fusion was necessary to prevent Wallerian degeneration and functional/behavioral *** examined how polyethylene glycol solutions per se affect functional and behavioral recovery and peripheral nerve allograft morphological and immunological responses in the absence of polyethylene glycol-induced axonal ***-type sciatic nerve injuries in outbred Sprague–Dawley rats were repaired according to a modified protocol using the same solutions as polyethylene glycol-fused peripheral nerve allografts,but peripheral nerve allografts were loose-sutured(loose-sutured polyethylene glycol)with an intentional gap of 1–2 mm to prevent fusion by polyethylene glycol of peripheral nerve allograft axons with host *** to negative control peripheral nerve allografts not treated by polyethylene glycol and in contrast to polyethylene glycol-fused peripheral nerve allografts,animals with loose-sutured polyethylene glycol peripheral nerve allografts exhibited Wallerian degeneration for all axons and myelin degeneration by 7 days postoperatively and did not recover sciatic-mediated behavioral functions by 42 days *** morphological signs of rejection,such as col

关键词： allograft rejection axotomy macrophage myelin nerve repair polyethylene glycol(PeG) sciatic nerve T cell transplantation Wallerian degeneration

molar Tooth Structure:a Contribution from the mesoproterozoic Gaoyuzhuang Formation,Tianjin City,North China

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(english edition) 2011年第5期85卷 1084-1099页

作者： maurice e.tucker Department of earth Sciences Durham University

molar-tooth(mT) structure is an enigmatic sedimentary structure consisting of variously-shaped cracks and voids filled with a characteristically uniform,equant calcite *** is globally distributed but temporally restricted to rocks from Neoarchean to Neoproterozoic *** origin of mT structures has been debated for more than a century and the topic continues to be highly *** features of mT structure occurring in micritic limestones of the mesoproterozoic Gaoyuzhuang Formation(ca.1500 ma to ca.1400 ma),Jixian section,Tianjin City,North China show that:1) there is a definite interface or lining,rich in organic material and pyrite,between the mT crack-filling calcite microspar and the micritic host rock,which is also rich in organic matter;2) the micritic host rocks are notable for the absence of stromatolites and microbial laminites;3) distinctive conglomeratic lag deposits made up of intraclasts of mT microspar result from storm reworking of the mT structures;4) the mT structure is associated with possible algal megafossils such as Chuaria;5) the mT microspar is made up of the larger calcite crystal and the mT crack is marked by the diversity of configurations;6) both the TOC content and the carbon-isotopic value(δ^(13)C_(PDB)) among the host rock, the mT microspar and the possible algae fossil are obviously *** the forming mechanism of the Gaoyuzhuang mT structure,these features can still indicate that:A) the mT microspar was formed by rapid precipitation and lithification;B) the mT microspar precipitated directly within the cracks; C) the decomposition of organic matter within the host micrite might be the chief mechanism producing gas bubbles;D) microscale gas-sediment interaction led to the generation of the mT cracks and the precipitation of microspar therein;e) the mT cracks might represent the track of migration and expansion of gas bubbles,and that the recrystallization of host micrites cannot be eliminated during forming proc

关键词： molar-tooth structure mesoproterozoic limestone Gaoyuzhuang Formation Tianjin North China

Nonlinear forced vibration in a subcritical regime of a porous functionally graded pipe conveying fluid with a retaining clip

在线全文

学校读者我要写书评

暂无评论

Applied mathematics and mechanics(english edition) 2025年第1期46卷 101-122页

作者： m.GHOLAmI m.eFTeKHARI Department of mechanical engineering Shahid Bahonar University of Kerman

This study examines the nonlinear behaviors of a clamped-clamped porous pipe made of a functionally graded material(FGm) that conveys fluids and is equipped with a retaining clip, focusing on primary resonance and subcritical dynamics. The nonlinear governing equations for the FGm pipe are derived by the extended Hamilton's principle, and subsequently discretized through the application of the Galerkin *** direct method of multi-scales is then used to solve the derived equations. A thorough analysis of various parameters, including the clip stiffness, the power-law index, the porosity, and the clip location, is conducted to gain a comprehensive understanding of the system's nonlinear dynamics. Through the analysis of the first natural frequency, the study highlights the influence of the flow velocity and the clip stiffness, while the comparisons with metallic pipes emphasize the role of FGm composition. The examination of the forced response curves reveals saddle-node bifurcations and their dependence on parameters such as the detuning parameter and the power-law index, offering valuable insights into the system's nonlinear resonant behavior. Furthermore, the frequency-response curves illustrate the hardening nonlinearities influenced by factors such as the porosity and the clip stiffness, revealing nuanced effects on the system response and resonance characteristics. This comprehensive analysis enhances the understanding of nonlinear behaviors in FGm porous pipes with a retaining clip, providing key insights for practical engineering applications in system design and optimization.

关键词：