检索结果-南通市图书馆

Science China earth Sciences 2008年第7期51卷 947-954页

作者： b.e.hobbs A.ORD CSIRO Division of exploration and Mining P. O. Box 1130 Bentley WA 6102 Australia

This paper presents a research methodology associated with approximately a decade old computa- tional geosciences. To demonstrate how it can be used to investigate the dynamic mechanisms of geological phenomenon, we use as an example the equal-distant distribution of gold deposits in a three-dimensional permeable fault within the Yilgarn Craton, Western Australia. The related numerical results demonstrate that: (1) convective pore-fluid flow in fluid-saturated porous media is the control- ling dynamic mechanism leading to the equal-distant distribution of gold deposits along the fault; (2) the main characteristic of the new methodology is to change the traditionally used empirical, descrip- tive and qualitative methodology into the fundamentally scientific principles based predictive and quantitative methodology. Thus, this new methodology provides a modern scientific research tool for investigating the dynamic mechanisms associated with observed geological phenomena in nature.

关键词： computational geosciences research methodology geological phenomena dynamic mechanisms

Computational modeling of free-surface slurry flow problems using particle simulation method

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2013年第6期20卷 1653-1660页

作者：赵崇斌彭省临刘亮明 b.e.hobbs A.Ord Computational Geosciences Research Centre Central South University School of earth and environment The University of Western Australia

The particle simulation method is used to solve free-surface slurry flow problems that may be encountered in several scientific and engineering *** main idea behind the use of the particle simulation method is to treat granular or other materials as an assembly of many *** with the continuum-mechanics-based numerical methods such as the finite element and finite volume methods,the movement of each particle is accurately described in the particle simulation method so that the free surface of a slurry flow problem can be automatically *** major advantage of using the particle simulation method is that only a simple numerical algorithm is needed to solve the governing equation of a particle simulation *** the purpose of illustrating how to use the particle simulation method to solve free-surface flow problems,three examples involving slurry flow on three different types of river beds have been *** related particle simulation results obtained from these three examples have demonstrated that:1) The particle simulation method is a promising and useful method for solving free-surface flow problems encountered in both the scientific and engineering fields;2) The shape and irregular roughness of a river bed can have a significant effect on the free surface morphologies of slurry flow when it passes through the river bed.

关键词： particle simulation free surface slurry flow numerical method

Computational simulation of convective flow in the earth crust under consideration of dynamic crust-mantle interactions

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2011年第6期18卷 2080-2084页

作者：赵崇斌彭省临刘亮明 b.e.hobbs A.ORD Computational Geosciences Research Centre Central South University School of earth and environment The University of Western Australia

The finite element method was used to solve fluid dynamic interaction problems between the crust and mantle of the earth. To consider different mechanical behaviours, the lithosphere consisting of the crust and upper mantle was simulated as fluid-saturated porous rocks, while the upper aesthenospheric part of the mantle was simulated as viscous fluids. Since the whole lithosphere was computationally simulated, the dynamic interaction between the crust and the upper mantle was appropriately considered. In particular, the mixing of mantle fluids and crustal fluids was simulated in the corresponding computational model. The related computational simulation results from an example problem demonstrate that the mantle fluids can flow into the crust and mix with the crustal fluids due to the resulting convective flows in the crust-mantle system. Likewise, the crustal fluids can also flow into the upper mantle and mix with the mantle fluids. This kind of fluids mixing and exchange is very important to the better understanding of the governing processes that control the ore body formation and mineralization in the upper crust of the earth.

关键词： computational simulation crustal fluids mantle fluids fluid dynamic interaction

上通流对大陆岩石圈地幔-地壳热结构模式的潜在影响

在线全文

学校读者我要写书评

暂无评论

地球物理学报 2008年第2期51卷 393-401页

作者：林舸赵崇斌 b.e.hobbs 张露周叶中国科学院边缘海地质重点实验室广州地球化学研究所广州510640 中南大学计算地球科学研究中心长沙410083 CSIRO exploration and Mining PO Box 1130Bentley WA6102Australia 中国科学院遥感应用研究所遥感信息科学重点实验室北京100101

本文以多孔介质中大尺度传热问题为基础,结合热平衡理论分析与数值计算,探讨了上通流对大陆岩石圈地幔-地壳热结构模式的潜在影响.根据大陆岩石圈中孔隙波传热概念模型的初步理论分析结果,指出了采用理论分析和数值模拟相结合的方法在... 详细信息

本文以多孔介质中大尺度传热问题为基础,结合热平衡理论分析与数值计算,探讨了上通流对大陆岩石圈地幔-地壳热结构模式的潜在影响.根据大陆岩石圈中孔隙波传热概念模型的初步理论分析结果,指出了采用理论分析和数值模拟相结合的方法在研究大陆岩石圈地幔-地壳热结构模式时的重要性.理论分析方法可用来确定岩石圈尺度范围内大陆岩石圈的厚度和大陆地壳相关的边界条件,从而为地壳范围内数值模型的建立提供一些重要信息.数值模拟方法可以用来模拟地壳尺度范围内地壳的详细结构和复杂几何形状.如果地壳内的热分布是所考虑的主要因素,采用具有地壳尺度的合理数值模型可以有效减少计算机工作量.利用理论分析方法求出的岩石圈尺度范围内大陆岩石圈厚度与地幔传导热流之间关系的理论解,不仅可以用来验证模拟大陆岩石圈内传热问题所采用的数值方法,而且可以用来初步研究大陆岩石圈内热分布的基本规律,为研究岩石圈地幔热事件中大陆岩石圈热减薄过程提供相应的边界条件.本文从理论分析的观点初步探讨了中国大陆不同构造背景下大陆岩石圈的热结构模式,其结果与从地球物理和地质资料中获得的大陆岩石圈热结构模式十分吻合.研究结果表明由大陆岩石圈中孔隙波传播所导致的上通流是影响大陆岩石圈地幔-地壳热结构模式及大陆岩石圈地幔与地壳之间物质和能量交换的可能机制之一.

关键词：热结构热传递上通流岩石圈地幔一地壳

用计算地球科学研究方法探讨地质现象的动力学机制--以断层中等距成矿分布为例

在线全文

学校读者我要写书评

暂无评论

中国科学（D辑） 2008年第5期38卷 646-652页

作者：赵崇斌 b.e.hobbs A.Ord 中南大学计算地球科学研究中心长沙410083 CSIRO Division of exploration and Mining P.O.Box 1130WA 6102Australia

主要目的是系统地提出与近年来发展起来的计算地球科学新兴学科相关的研究方法.以强透水性三维断层中矿床等距分布为例,探讨应用计算地球科学研究方法揭示已观察到地质现象的动力学机制.有关结果表明:(1)孔隙介质中流体对流是强透水性... 详细信息

主要目的是系统地提出与近年来发展起来的计算地球科学新兴学科相关的研究方法.以强透水性三维断层中矿床等距分布为例,探讨应用计算地球科学研究方法揭示已观察到地质现象的动力学机制.有关结果表明:(1)孔隙介质中流体对流是强透水性三维断层中矿床等距性分布的主要动力学机制.(2)计算地球科学研究方法的主要特征是把传统地学中常用的经验性描述方法变革为以基本科学原理为基础的定量化科学研究方法,为深入探讨地质现象的动力学机制提供了一种现代化科学研究工具.

关键词：计算地球科学研究方法地质现象动力学机制

在线全文

学校读者我要写书评

暂无评论

地壳中的流体与岩石变形

地质科技通报 1987年第1期 38-44页

作者： b.e.hobbs 郑亚东北京大学澳

本讲要点包括:1．地壳中流体存在的依据;2．流体的起源;3．流体的压力;4．地壳中水逸度的分布;5．水一二氧化碳混合物;6．破裂与矿脉。重点是流体的一些特征和对变形的影响。一、地亮中流体存在的依据地壳中有流体的主要依据有三:1．变... 详细信息

本讲要点包括:1．地壳中流体存在的依据;2．流体的起源;3．流体的压力;4．地壳中水逸度的分布;5．水一二氧化碳混合物;6．破裂与矿脉。重点是流体的一些特征和对变形的影响。一、地亮中流体存在的依据地壳中有流体的主要依据有三:1．变质作用各种变质岩,从绿片岩相到麻粒岩相岩中发生很多变质作用,表明如果不是水压力大致等于总压力,至少也导流体压力大致等于总压力。

关键词：流体压力逸度热力学函数岩石变形石英脉矿脉矿体地壳地球外壳地球内部

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

地壳中的应力与拆离构造

地质科技通报 1986年第4期 26-32页

作者： b.e.hobbs 郑亚东澳

这里所说的应力是沿先存断裂(断层和节理)滑动所需要的应力,即变形方式本质上为脆性。这是应力的上限,因为很弱的岩石(如片岩、页岩)在很小的应力下便发生变形。该应力可由下式给出:τ=μσn式中μ为摩擦系数。该关系式便是大家所熟知的... 详细信息

这里所说的应力是沿先存断裂(断层和节理)滑动所需要的应力,即变形方式本质上为脆性。这是应力的上限,因为很弱的岩石(如片岩、页岩)在很小的应力下便发生变形。该应力可由下式给出:τ=μσn式中μ为摩擦系数。该关系式便是大家所熟知的byerlee定律。就我所知,byerlee不是最早发现这一关系者,最早是由德温斯(译音)提出的。Sibson(1977)在《自然》杂志中将这一定律运用于形成正断层、逆断层和平移断层对可能存在的应力分布(图1)。马杏垣教

关键词：地温梯度基部应力分布地热增温率地壳地球外壳地球内部逆掩断层逆断层走滑断层平移断层地质断层岩石强度长石质重力断层热穹窿地震带地震构造带

A systematic scoping review of study methodology for randomized controlled trials investigating probiotics in athletic and physically active populations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2024年第1期13卷 61-71页

作者： Alex e.Mohr David b.Pyne Geovana Silva Fogaça Leite Deborah Akins Jamie Pugh College of Health Solutions Arizona State UniversityPhoenixAZ 85004USA Research Institute for Sport and exercise University of CanberraCanberraACT 2617Australia Laboratory of Functional Fermented Food Faculty of Pharmaceutical SciencesUniversity of São PauloSão Paulo 05508-030Brazil Research Institute for Sport and exercise Sciences Liverpool John Moores UniversityLiverpool L33AFUK

background:The purported ergogenic and health effects of probiotics have been a topic of great intrigue among researchers,practitioners,and the lay public *** has also been an increased research focus within the realm of sports science and exercise medicine on the athletic gut ***,compared to other ergogenic aids and dietary supplements,probiotics present unique study *** objectives of this systematic scoping review were to identify and characterize study methodologies of randomized controlled trials investigating supplementation with probiotics in athletes and physically active ***:Four databases(MeDLINe,CINAHL,Cochrane CeNTRAL,and Cochrane Database of Systematic Reviews)were searched for randomized controlled studies involving healthy athletes or physically active *** intervention with probiotics and inclusion of a control and/or placebo group were *** peer-reviewed articles in english were considered,and there were no date *** were extracted and presented in tabular form to detail study protocols,characteristics,and *** in randomized controlled trials was determined with the Rob 2.0 ***:A total of 45 studies were included in the review,with 35 using a parallel group design and 10 using a cross-over *** half the studies used a single probiotic and the other half a multi-strain *** probiotic dose ranged from 2×10^(8)to 1×10^(11)colony forming units daily,and the length of intervention was between 7 and 150 *** than half the studies directly assessed gastrointestinal symptoms,gut permeability,or the gut *** sex ratio of participants was heavily weighted toward males,and only 3 studies exclusively investigated ***-level adverse events were reported in only 2 studies,although the methodology of reporting varied *** risk of bias was generally low,although details on randomization were lacking in some s

关键词： exercise experimental methodology Gastrointestinal symptoms Gut microbiota Probiotic supplementation

Cellulose synthesis in land plants

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2024年第2期17卷 359-361页

作者： Gustav b.Pedersen Leonard blaschek Kristian e.H.Frandsen Lise C.Noack Staffan Persson 不详

After the original publication of the above article,we and/or attentive readers identified several instances of unclear or erroneous writing that needed correcting,as *** are added for emphasis.

关键词： synthesis instance identif

RbC aggregation,deformation and adhesion to endothelium:Role of nitric oxide derived from L-Arginine and sodium nitroprusside

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

Journal of Innovative Optical Health Sciences 2024年第5期17卷 53-65页

作者： M.K.Maksimov P.b.ermolinskiy O.N.Scheglovitova N.N.Sklyankina A.V.Muravyov A.e.Lugovtsov A.V.Priezzhev Faculty of Physics M.V.Lomonosov Moscow State University bld.1subbuilding.2Leninskie goryMoscow 11991Russia N.F.Gamaleya National Research Center for epidemiology and Microbiology 18 Gamaleya StreetMoscow 123098Russia K.D.Ushinsky Yaroslavl State Pedagogical University 108/1 Respublikanskaya StreetYaroslavl 150000Russia

Red blood cells(RbCs)are the most abundant human blood *** aggregation and deformation strongly determine blood viscosity which impacts hemorheology and *** turn,RbC properties depend on di®erent endogenous and exogenous *** such factor is nitric oxide(NO),which is mainly produced by endothelial cells(eC)from L-arginine amino acid in the circulatory *** the mechanisms of the RbC-endothelium interplay are not clear up to date and considering its possible clinical importance,the aims of this study are to investigate in vitro:(1)The e®ect of L-arginine induced NO on RbC aggregation and adhesion to endothelium;(2)the NO e®ect on RbC aggregation and deformation induced by L-arginine and sodium nitroprusside without the presence of endothelium in the *** RbC aggregation and adhesion to a monolayer of eC were studied using optical tweezers(OT).The RbC deformability and aggregation without endothelium in the samples were studied using the°ow chamber method and Myrenne *** con¯rmed that NO increases deformability and decreases aggregation of *** showed that the soluble guanylate cyclase pathway appears to be the only NO signaling pathway *** the samples with the endothelium,the\bell-shaped"dependence of RbC aggregation force on L-arginine concentration was observed,which improves our knowledge about the process of NO production by ***,data related to L-arginine accumulation by endothelium were obtained:Necessity of the presence of extracellular L-arginine stated by other authors was put under *** our study,NO decreased the RbC-endothelium adhesion,however,the tendency appeared to be weak and was not con¯rmed in another set of *** our knowledge,this is the¯rst attempt to measure the forces of RbC adhesion to endothelium monolayer with OT.

关键词： Red blood cells aggregation L-arginine endothelium optical tweezers Myrenne flow chamber