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Assessment of pipeline stability in the Gulf of Mexico during hurricanes using dynamic analysis

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Theoretical & Applied Mechanics Letters 2015年第2期5卷 74-79页

作者： Yinghui Tian Bassem Youssef Mark j.cassidy Centre for Offshore Foundation Systems and ARC CoE for Geotechnical Science and Engineering University of Western Australia Atteris Level 3220 St Georges TerracePerthWA6000Australia

Pipelines are the critical link between major offshore oil and gas developments and the mainland. Any inadequate on-bottom stability design could result in disruption and failure, having a devastating impact on the economy and environment. Predicting the stability behavior of offshore pipelines in hurricanes is therefore vital to the assessment of both new design and existing assets. The Gulf of Mexico has a very dense network of pipeline systems constructed on the seabed. During the last two decades, the Gulf of Mexico has experienced a series of strong hurricanes, which have destroyed, disrupted and destabilized many pipelines. This paper first reviews some of these engineering cases. Following that, three case studies are retrospectively simulated using an in-house developed program. The study utilizes the offshore pipeline and hurricane details to conduct a Dynamic Lateral Stability analysis, with the results providing evidence as to the accuracy of the modeling techniques developed.

关键词： Pipeline On-bottom stability Dynamic lateral stability analysis Force-resultant model Hydrodynamic load

Failure mechanisms of a spudcan penetrating next to an existing footprint

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Theoretical & Applied Mechanics Letters 2015年第2期5卷 64-68页

作者： Vickie Kong Mark j.cassidy Christophe Gaudin Fugro-Advanced Geomechanics Centre for Offshore Foundation Systems and ARC CoE for Geotechnical Science and Engineering University of Western Australia

Reinstallation of mobile jack-up rigs next to existing footprints is a problematic operation because the spudcan located near the footprints is subjected to eccentric and/or inclined loading conditions. Geotech- nical centrifuge studies have measured these loads for combinations of changing footprint geometry, footprint soil properties and the offset of the reinstallation from the footprint centre. These tests have been of full model spudcans in order to accurately measure the combined loads developed. They have not provided information on the mechanisms of failure occurring during this complex installation. Ob- servations from a visualisation test, where a half spudcan is penetrated against a transparent window in a geotechnical centrifuge, are reported in this paper. The mechanisms of failure at different stages during the nenetrntirm are nr^nted

关键词： jack-up Footprint Combined loading Spudcan Offshore geotechnics

Editorial:Special issue on offshore structure-soil interaction

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Theoretical & Applied Mechanics Letters 2015年第2期5卷 63-63页

作者： Fu-Ping Gao Mark j.cassidy Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of Sciences Centre for Offshore Foundation Systems and ARC CoE for Geotechnical Science and Engineering University of Western Australia

As the offshore industries move from shallow to deep waters in excess of 1000 m, there has been rapid development of ocean engineering practices. Innovations in theoretical and applied me- chanics have been essential in this shift and in underpinning the exploitation of offshore oil and gas and renewable energy re- sources worldwide. Understanding and predicting physical mech- anisms of structure-soil interactions are vital for the stability and safety of offshore engineering structures. Accordingly, in this spe- cial issue of Theoretical ＆ Applied Mechanics Letters （TAME）, eight letter-papers are published to present recent advances in analyti- cal and numerical analysis and in physical modeling of offshore structure-soil interactions in marine environments. They all provide examples of how enhanced understanding of mechanics can imoact on aoDlied oroiects.

关键词： soil Editorial

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煤液化的关键在哪里?

煤炭转化 1985年第2期 29-34+39页

作者： Peter j.cassidy ,曾友明

近来,由于对煤液化的反应机理了解较多,使煤的液化研究有了新的进展。本文以《罗恩(澳大利亚)国际煤炭研究会论文集》及其它一些重要文献为依据,讨论煤的液化率预测,液化的反应机理,还原气及加入金屑的作用,循环溶剂的选择和液化法研究... 详细信息

近来,由于对煤液化的反应机理了解较多,使煤的液化研究有了新的进展。本文以《罗恩(澳大利亚)国际煤炭研究会论文集》及其它一些重要文献为依据,讨论煤的液化率预测,液化的反应机理,还原气及加入金屑的作用,循环溶剂的选择和液化法研究的进展等问题。一、液化率的预测煤都是由碳、氢、氧及少量硫、氮组成,但前三种主要元素含量比例差别很大,不同的煤,具有不同的液化倾向。要预测某种原料煤的液化潜力,可利用商品设备或小型模拟装置测试,也可对其基本特性进行分析,如元素分析。

关键词：苯可溶物氢压自由基均裂芳族稠环汽油游离基燃料油反应阶段反应机理反应机制煤液化液化法沥青烯马青烯催化剂反应温度热解液溶剂加氢处理

The skeletal muscle fiber periphery:A nexus of mTOR-related anabolism

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运动医学与健康科学(英文) 2023年第1期5卷 10-19页

作者： cassidy T.Tinline-Goodfellow Matthew j.Lees Nathan Hodson Faculty of Kinesiology and Physical Education University of TorontoCanada Institute of Sport Manchester Metropolitan UniversityManchesterUnited Kingdom Department of Sport and Exercise Sciences Manchester Metropolitan UniversityManchesterUnited Kingdom

Skeletal muscle anabolism is driven by numerous stimuli such as growth factors,nutrients(i.e.,amino acids,glucose),and mechanical *** stimuli are integrated by the mechanistic target of rapamycin(mTOR)complex 1(mTORC1)signal transduction *** recent years,work from our laboratory and elsewhere has sought to unravel the molecular mechanisms underpinning the mTOR-related activation of muscle protein synthesis(MPS),as well as the spatial regulation of these mechanisms within the skeletal muscle *** studies have suggested that the skeletal muscle fiber periphery is a region of central importance in anabolism(i.e.,growth/MPS).Indeed,the fiber periphery is replete with the substrates,molecular machinery,and translational apparatus necessary to facilitate *** review provides a summary of the mechanisms underpinning the mTOR-associated activation of MPS from cell,rodent,and human *** also presents an overview of the spatial regulation of mTORC1 in response to anabolic stimuli and outlines the factors that distinguish the periphery of the cell as a highly notable region of skeletal muscle for the induction of *** research should seek to further explore the nutrient-induced activation of mTORC1 at the periphery of skeletal muscle fibers.

关键词： Skeletal muscle mTOR Periphery Muscle protein synthesis Hypertrophy Translation

有机硫对维多利亚褐煤液化的催化作用之穆斯堡尔研究

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江苏师范大学学报（自然科学版） 1989年第2期19卷 33-42页

作者： Peter S.Cook Lim Soon Chuan 杭桂生 W.Roy jackson Peter j.cassidy 徐州师范学院物理系

我们以Morwell和Coolungoolun两种维多利亚褐煤进行实验,对铁和锡在煤的液化中的催化作用进行了比较,发现锡对低硫的Morwell煤较为有效,而铁则更适合于高硫的Coolungoolun煤。对液化余渣的穆斯堡尔分析的结果,使我们可以用低硫煤中元素... 详细信息

我们以Morwell和Coolungoolun两种维多利亚褐煤进行实验,对铁和锡在煤的液化中的催化作用进行了比较,发现锡对低硫的Morwell煤较为有效,而铁则更适合于高硫的Coolungoolun煤。对液化余渣的穆斯堡尔分析的结果,使我们可以用低硫煤中元素态锡的形成以及在高硫煤中磁黄铁矿（Fe_(0.92)S）的形成来对观察到的现象作出解释。硫的损耗数据表明,磁黄铁矿的存在使得煤中的硫转化为气相的量增加了。

关键词：煤液化有机硫穆斯堡尔谱