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Influence of particle contact models on soil response of poorly graded sand during cavity expansion in discrete element simulation

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第6期10卷 1154-1170页

作者： Yang Dong Behzad Fatahi Hadi Khabbaz henry zhang School of Civil and Environmental Engineering University of Technology Sydney (UTS) WSP in Australia & New Zealand Sydney Office

The discrete element method(DEM) has been extensively adopted to investigate many complex geotechnical related problems due to its capability to incorporate the discontinuous nature of granular materials. In particular, when simulating large deformations or distortion of soil(e.g. cavity expansion),DEM can be very effective as other numerical solutions may experience convergence problems. Cavity expansion theory has widespread applications in geotechnical engineering, particularly to the problems concerning in situ testing, pile installation and so forth. In addition, the behaviour of geomaterials in a macro-level is utterly determined by microscopic properties, highlighting the importance of contact models. Despite the fact that there are numerous contact models proposed to mimic the realistic behaviour of granular materials, there are lack of studies on the effects of these contact models on the soil ***, in this study, a series of three-dimensional numerical simulations with different contact constitutive models was conducted to simulate the response of sandy soils during cylindrical cavity expansion. In this numerical investigation, three contact models, i.e. linear contact model, rolling resistance contact model,and Hertz contact model, are considered. It should be noted that the former two models are linear based models, providing linearly elastic and frictional plasticity behaviours, whereas the latter one consists of nonlinear formulation based on an approximation of the theory of Mindlin and Deresiewicz. To examine the effects of these contact models, several cylindrical cavities were created and expanded gradually from an initial radius of 0.055 m to a final radius of 0.1 m. The numerical predictions confirm that the calibrated contact models produced similar results regarding the variations of cavity pressure, radial stress, deviatoric stress, volumetric strain, as well as the soil radial displacement. However, the linear contact model may resu

关键词： Discrete element method(DEM) Cavity expansion Contact models Behaviour of geomaterials

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Environmental impact assessment of emissions from non-recycled plastic-to-energy processes

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Waste Disposal and Sustainable Energy 2021年第1期3卷 1-11页

作者： henry zhang Nikolas J.Themelis Athanasios Bourtsalas Montgomery High School SkillmanNJ 08558USA Earth Engineering Center Columbia UniversityNew YorkNY 10027USA

Generally,plastics pose a variety of environmental impacts due to their increased use and ***-of-life treatment is a viable way of recovering energy from plastics while at the same time reducing the amount of plastics disposed of in *** paper studies the environmental impact of Non-Recycled Plastics(NRP)-to-energy *** waste treatment processes were considered for NRP:pyrolysis,waste-to-energy(WtE),and *** environmental impact assessment results indicated that conversion technologies such as pyrolysis and WtE are preferred over *** total energy consumed in the pyrolysis process was 24635.7 MJ/*** conversion technologies have a lower environmental impact and produced net positive energy from *** global warming potential shows that pyrolysis(3.91 kg ***_(2))contributes the least to global warming than waste-to-energy(18.56 kg ***_(2))and landfill(17.5 kg ***_(2)).However,sensitivity analysis suggested that the inefficiencies of the current conversion technologies should be *** the two technologies studied,pyrolysis contributed less environmental burden,having a lower global warming potential,a higher efficiency in energy conversion,and less harmful emissions such as selenium and methane.

关键词： Non-recycled plastic Environmental impact assessment Life cycle impact assessment End-of-life treatment Waste-to-energy(WtE) Landfill Pyrolysis

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Prosthetic reconstruction of the trachea:A historical perspective

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World Journal of Clinical Cases 2017年第4期5卷 128-133页

作者： Jagdeep S Virk henry zhang Reza Nouraei Guri Sandhu Department of Otolaryngology Head and Neck SurgeryRoyal National ThroatNoseand Ear Hospital Department of Otolaryngology Head and Neck SurgeryQueen’s HospitalRomford RM7 0AGUnited Kingdom Department of Otolaryngology Head and Neck SurgeryCharing Cross Hospital

This review discusses the history of tracheal reconstruction; from early work to future challenges. The focus is primarily on prosthetic tracheal reconstruction in the form of intraluminal stents, patch repairs, circumferential repairs and replacement of the trachea. A historical perspective of materials used such as foreign materials, autografts, allografts, xenografts and techniques, along with their advantages and disadvantages, is provided.

关键词： Tracheal stenosis Trachea Prostheses and implants Stents

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Foreword

Foreword

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作者： henry zhang

＜正＞This edition features call of paper on theme of geological research and engineering.I hope that those essays can inspire to try new trend and practice in *** total 137 essays are accepted from "The 7 th Academic Conference of Geology Resource Management and Sustainable Development" which is held in Beijing,China at 29 December,*** as

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美国地方政府对区划法的修改

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城市规划学刊 2010年第4期 52-60页

作者：张宏伟美国马里兰国家首都公园规划管理委员会规划审批处

区划法作为美国地方政府控制私人用地开发,实施一个地区或城市的总体用地规划的主要手段,经历了约一个世纪的变迁,显露很多不足之处。自1990年代开始,美国地方政府纷纷对区划法进行全面修改以适应新的开发建设控制的需要。通过对已经完... 详细信息

区划法作为美国地方政府控制私人用地开发,实施一个地区或城市的总体用地规划的主要手段,经历了约一个世纪的变迁,显露很多不足之处。自1990年代开始,美国地方政府纷纷对区划法进行全面修改以适应新的开发建设控制的需要。通过对已经完成区划法修改的城市,以及正在进行区划法修改的城市的过程和成果的全面考察,介绍了区划法的类型、修改的程序、公众参与的方式、所要解决的问题和成功的办法,以及可吸取的经验。

关键词：美国地方政府区划法修改

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阿彼察邦·韦拉斯哈古的洞穴说:一个反柏拉图主义者的影像实验

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艺术界 2017年第3期 74-83页

作者：徐明瀚 henry zhang 台北艺术大学美术学院

前言如果说，古希腊哲学家柏拉图的理想国．是一整套“蒙昧之人”果断摆脱洞穴而成为“受教化之人”的心灵启迪境地，那么当代泰国电影导演与视觉艺术家阿彼察邦·韦拉斯哈古操演的则正好相反．

关键词：英语阅读理解艺术界

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非隔离式开关电源的PCB布局考虑

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电子设计技术 EDN CHINA 2012年第12期19卷 42-44,46,47页

作者： henry J zhang Linear技术公司

良好的PCB布局设计可优化电源效率，减缓热应力；夏重要的是，它最大限费地减小了噪声，以及走线与元件之间的相互作用。要实观非隔离并关电源的正确布局设计，务必牢记这些设计要素。

关键词：开关电源 PCB布局无源元件 Linear

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从现实情境抽离——谈2017年的艺术景观和展览系统

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艺术界 2017年第4期 298-303页

作者：皮力 henry zhang

我想从2017年夏天的三个主要场合的三件作品开始讨论艺术的景观和展览系统。第一件作品是威尼斯双年展中丹麦艺术家奥拉维尔·埃利亚松（Olafur Eliasson）的绿光项目。这个项目出现在威尼斯双年展的主题展的意大利馆中。

关键词：现实情境 2017年艺术景观艺术欣赏

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异形怪物的普遍焦虑

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艺术界 2017年第4期 199-207页

作者：詹育杰 henry zhang

游走边境德国馆外迎接观众的是铁丝网围篱、德国警卫犬以及“禁止进入”的告示，一名全身黑色运动服的表演者跨坐在铁丝网上，玛丽娜·阿布拉莫维奇（Marina Abramovic）鼠蹊部忍受痛苦的全裸行为在此转化为跨界的动作。

关键词：艺术创作艺术欣赏艺术作品德国

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Effect of intranasal stents(AlaxoLito, AlaxoLito Plus and AlaxoLito Xtreme) on the nasal airway:A case report

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World Journal of Otorhinolaryngology 2019年第1期8卷 4-11页

作者： henry zhang Bhik Kotecha Otolaryngology Royal National Throat Nose and Ear Hospital

BACKGROUND The study of intranasal stents on the nasal airway is limited in the medical literature. The authors aim to provide objective measurements on their effects on the nasal airway. The aim is to study the feasibility of three novel intranasal stenting devices, AlaxoLito, AlaxoLito Plus, and AlaxoLito Xtreme, as treatment for nasal *** SUMMARY A 58-year-old man, who had right sided nasal obstruction, used stents during sporting activities intermittently for four years and subsequently in addition to intermittent sports use regularly for sleep for another two years. Magnetic resonance imaging(MRI) of the nasal passages and rhinomanometric measurements were taken with and without stents in situ. The stents tested are all braided from thin nitinol wires. The AlaxoLito Nasal Stent has a length of 35 *** AlaxoLito Plus and AlaxoLito Xtreme Nasal Stents have a length of 60 *** have a diameter of about 10 mm in unloaded state and comprise a widened,ball-shaped section(which is positioned at the nasal alar) of about 11 and 14 mm,respectively. Rhinomanometric nasal airflow after application of the stents improved 1.11, 1.23, and 1.38 fold, respectively, with application of the AlaxoLito,AlaxoLito Plus and AlaxoLito Xtreme stents. MRI showed that after application of the stents, the nasal passage increased in *** Intranasal stenting shows improvement in nasal airflow. Intermittent and regular longterm use had been shown to be safe, with no discomfort and no side effects.

关键词： Intranasal stent Airway Obstructive sleep apnoea Rhinomanometry Magnetic resonance imaging

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