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Ultra-wideband (UWB) band-notched resonator-embedded power divider 超宽带(UWB)带陷波谐振嵌入式功率分配器
Q2 Engineering Pub Date : 2020-01-01 DOI: 10.33430/v27n2thie-2019-0032
Yilin Xiao, K. Song, Yuxuan Chen
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引用次数: 0
Special Issue with Awarded and Shortlisted Papers from the HKIE Outstanding Paper Award for Young Engineers/Researchers 2019 特刊刊载2019年香港工程师学会杰出论文奖得奖及入围论文
Q2 Engineering Pub Date : 2019-12-20 DOI: 10.33430/v26n4
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引用次数: 0
Virtual reality (VR) supported lift planning for modular integrated construction(MiC) of high-rise buildings 虚拟现实(VR)技术支持高层建筑模块化集成施工的电梯规划
Q2 Engineering Pub Date : 2019-09-27 DOI: 10.33430/v26n3thie-2019-0015
Zhiqian Zhang, W. Pan
Modular integrated construction of high-rise buildings has shown its potential in accelerating the speed of construction, improving safety, safeguarding quality and enhancing productivity. However, due to the disruptive change to the construction process, challenges are identified to effectively plan and handle multiple lifts for hoisting heavy modules. Research on lift planning includes the development of simulation tools. However, the previous tools provided either static simulations or pre-designed animations that did not address the interactions between planners and the tools. Virtual reality (VR) offers an opportunity to build an interactive and navigable 3D environment. This paper aims to develop a userfriendly VR-supported tool for achieving effective lift planning for constructing high-rise modular buildings. First, the module lifting process and tower crane operations were analysed. Second, a VR demonstration was developed using a real-life modular building project. Third, the demonstration was used during interviews with the project team to verify the effectiveness of the developed tool. Results suggest that the tool can help optimise the site layout and lift logistics through the provided functions of collision detection and construction simulation. The findings suggest that VR-supported lift planning will contribute to ensure site safety and enhance the productivity of modular high-rise building construction.
高层建筑的模块化集成施工在加快施工速度、提高安全性、保障质量和提高生产力方面显示出了潜力。然而,由于施工过程的颠覆性变化,有效规划和处理用于吊装重型模块的多台升降机面临挑战。电梯规划的研究包括模拟工具的开发。然而,以前的工具提供了静态模拟或预先设计的动画,但没有解决规划者和工具之间的互动问题。虚拟现实(VR)提供了一个建立交互式和可导航的3D环境的机会。本文旨在开发一种用户友好的VR支持工具,用于实现高层模块化建筑的有效电梯规划。首先,对模块吊装过程和塔式起重机的操作进行了分析。其次,使用真实的模块化建筑项目开发了VR演示。第三,在与项目团队的访谈中使用了该演示,以验证所开发工具的有效性。结果表明,该工具可以通过提供的碰撞检测和施工模拟功能,帮助优化现场布局和电梯物流。研究结果表明,VR支持的电梯规划将有助于确保现场安全,并提高模块化高层建筑施工的生产力。
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引用次数: 9
Stabilisation of soft clay by deep cement mixing (DCM) method – A case study 用深层水泥搅拌(DCM)法稳定软粘土-一个案例研究
Q2 Engineering Pub Date : 2019-09-27 DOI: 10.33430/v26n3thie-2018-0039
Yanhua Wang, H. Dou, Geng-xin Xie
Soft ground under the sea often presents challenges for supporting seawall or reclamation without treatment if no dredging is implemented. Ground treatment is often required to improve the engineering properties of weak soils to enhance bearing capacity for supporting the intended structures. Deep soil mixing with addition of binder is one of the ground treatment methods that has been widely used in Asia and worldwide. This method was recently adopted by the authors for a practical ground improvement project in Hong Kong. This paper presents the characteristics of cement-soil mixture in the laboratory environment as well as performance of the field mixed soil using the same binder material. A detailed test programme was developed to evaluate the strength and other properties of the cement-soil mixtures by using various amounts of binder and water to binder ratios. A series of unconfined compressive strength (UCS) of the laboratory mixture were performed. The relationship of strength of the cement-soil mixture with binder dosages is developed. Test results of laboratory mixed soils were compared with those of field mixed soils. The relationship of strength betweenlaboratory mixed soils and field mixed soils was derived. Field installation of deep mixing for the project is discussed.
海底软土地若不进行疏浚工程,往往难以在未经处理的情况下支撑海堤或填海。地基处理往往需要改善软弱土的工程性质,以提高承载能力,以支持预期的结构。加入粘结剂拌和深层土是目前在亚洲及世界范围内广泛应用的地基处理方法之一。作者最近在香港的一个实际地基改善工程中采用了这种方法。本文介绍了水泥土混合料在实验室环境下的特性,以及使用相同粘结剂材料的现场混合土的性能。制定了详细的测试方案,通过使用不同数量的粘合剂和水胶比来评估水泥土混合物的强度和其他特性。进行了一系列实验室混合物的无侧限抗压强度(UCS)测试。建立了水泥土混合料强度与粘结剂掺量的关系。将室内混合土的试验结果与田间混合土的试验结果进行了比较。推导了室内混合土与现场混合土的强度关系。对工程现场深度搅拌装置进行了探讨。
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引用次数: 1
Energy recovery from small-scale energy-from-waste (EfW) facility – Possibleapplication in Hong Kong 从小型能源废物(EfW)设施中回收能源——在香港的可能应用
Q2 Engineering Pub Date : 2019-09-27 DOI: 10.33430/v26n3thie-2019-0024
Cassie Chow, A. Cheung
Solid waste management system is becoming a significant environmental, economic and technological challenge due to the increasing population and different waste stream. Municipal solid waste (MSW) is easy to generate but difficult to venerate. The question of whether MSW is an undervalued resource or an environmental burden is in continual debate. This paper presents an overview and structure of the current MSW management in Hong Kong and the advantages of waste diversion when the waste that normally would be delivered to the landfill is removed from the MSW. This paper also studies the technology of energy recovery which can be achieved from MSW in direct combustion as a fuel to produce power and heat, or indirectly, through waste conversion to fuel or fuel in a state of storage for future use. The necessity, rationale and application of energy recovery facilities are discussed to meet public health and environmental concerns and the public’s desire and willingness to reuse and recycle waste materials. Solid waste management serves both resource recovery and waste disposal in the public’s future challenges and opportunities for change.
由于人口的增长和不同的废物流,固体废物管理系统正在成为一个重大的环境、经济和技术挑战。城市生活垃圾是一种容易产生却难以治理的垃圾。关于都市固体废物是一种被低估的资源还是一种环境负担的问题一直在争论。本文介绍香港现时都市固体废物管理的概览和结构,以及将通常运往堆填区的废物从都市固体废物中移走后,废物转移的好处。本文还研究了将城市生活垃圾作为燃料直接燃烧产生电力和热量的能量回收技术,或间接地将垃圾转化为燃料或处于储存状态的燃料以供将来使用。讨论能源回收设施的必要性、原理和应用,以满足公众对健康和环境的关注,以及公众对废物再利用和循环利用的愿望和意愿。固体废物管理服务于资源回收和废物处置,以应对公众未来的挑战和机遇。
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引用次数: 0
Modelling tacit knowledge transfer in MOOCs: Simulations on the transfer process MOOC中隐性知识转移的建模:转移过程的模拟
Q2 Engineering Pub Date : 2019-09-27 DOI: 10.33430/v26n3thie-2018-0036
Jilan Wu, Shanshan Shang
Massive Open Online Courses (MOOCs) are massive large-scale open online resources provided by famous universities or organisations by which anybody can take the courses anywhere through internet connection for free. The implementation of MOOCs in universities shows a new form of learning. Considering that tacit knowledge plays a very important role in learning, this paper discusses the tacit knowledge transfer process in MOOCs. A useful system dynamics model to analyse which factors impact the tacit knowledge transfer effect is proposed in this research. A simulation method is used to illustrate the relation between transfer effect and these factors through sensitivity analysis. The results show that transfer effect increases with the circulation of the platform and technology advances of MOOCs, but the rate of growth has changed from high to low. The research mainly aims to guide the design and operation of MOOCs andother e-learning platforms.
大规模开放在线课程(MOOC)是由著名大学或组织提供的大规模开放在线资源,任何人都可以通过互联网连接在任何地方免费学习。MOOC在大学的实施展示了一种新的学习形式。鉴于隐性知识在学习中起着非常重要的作用,本文讨论了MOOC中的隐性知识迁移过程。本文提出了一个有用的系统动力学模型来分析哪些因素影响隐性知识转移效应。通过敏感性分析,采用模拟方法说明了转移效应与这些因素之间的关系。结果表明,转移效应随着平台的流通和MOOC技术的进步而增加,但增长率由高变低。本研究主要旨在指导MOOC和其他电子学习平台的设计和运营。
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引用次数: 0
Numerical simulation and characteristics investigation of golf ball trajectory 高尔夫球运动轨迹的数值模拟及特性研究
Q2 Engineering Pub Date : 2019-09-27 DOI: 10.33430/v26n3thie-2018-0040
Xi Wang, Hanyu Chen, Xiaofeng Li
In this study, MATrixLABoratory (MATLAB)’s ode 45 method was adopted to investigate the effects of the three main factors on golf trajectory characteristics, and the preferred striking conditions were concluded. Meanwhile, the results of interaction analysis were used to assess the dependence of carry distance and peak height on each factor. Eventually, the realistic normal swing tests were conducted in a laboratory to confirm the validation and accuracy of the mathematical model. The simulated results showed that a faster club head speed generally enabled to improve carry distance. However,once the rotational speed was more than 3,000 r·min-1, the increased tendency of carry distance turned to decrease. Moreover, the decreased tendency was aggravated as the increase of club head speed and launch angle, but the low launch angle benefited to alleviate the decrease. Compared to the carry distance, peak height always rose in any conditions. Meanwhile, the combined effects of the three factors on carry distance were more obvious than on the peak height. Finally, the optimised striking strategies were concluded for golfer-slow, golfer-medium and golfer-fast, respectively.
本研究采用MATrixLABoratory (MATLAB)的ode 45方法,研究了三个主要因素对高尔夫球轨迹特性的影响,并得出了优选的击球条件。同时,利用互作分析的结果,评价携峰距离和峰高对各因子的依赖关系。最后,在实验室进行了实际的正常摆动试验,验证了数学模型的有效性和准确性。仿真结果表明,较快的杆头速度一般能提高杆头的携带距离。当转速超过3000 r·min-1时,携带距离的增加趋势转为减小。随着杆头速度和发射角度的增加,下降趋势加剧,但较小的发射角度有利于缓解下降趋势。相对于搬运距离,峰高在任何条件下都呈上升趋势。同时,3个因子的综合作用对携带距离的影响比对峰高的影响更明显。最后,分别得出了高尔夫慢、高尔夫中、高尔夫快的最优击球策略。
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引用次数: 0
Failure Behaviour and Design of I-shape Metal Brackets for Truss-out Bamboo Scaffolding 竹木脚手架工字钢支架的失效特性及设计
Q2 Engineering Pub Date : 2019-05-25 DOI: 10.33430/V26N1THIE-2018-0006
Chaobo Zhang, Chih-Chen Chang
For many decades, truss-out bamboo scaffolding has been widely used in Hong Kong for maintaining and retrofitting structures. Yet there are major concerns about the safety of truss-out bamboo scaffoldings due to the metal brackets that support them frequently failing. This paper presents an investigation into the failure behaviour of the most commonly used support for scaffoldings: the I-shape metal bracket. Uniform distributed load (UDL) tests were performed on 39 × I-shape metal brackets to analyse their mechanical behaviour and failure mechanism in different anchorage locations. The test data obtained was used to establish a finite element model for the bracket. Criteria governing the failure of brackets were then developed and calibrated against the test data. A new set of I-shape metal brackets with redesigned dimensions were then tested to verify the proposed failure criteria. Results show that the proposed failure criteria match well with the experimental results. A set of rules is therefore recommended for the limit state design of the I-shape metal bracket. The proposed failure criteria and design rules could be used to design I-shape metal brackets for the industry that offer greater safety and reliability.
几十年来,桁架式竹脚手架在香港被广泛用于维护和改造结构。然而,由于支撑竹棚的金属支架经常出现故障,因此人们对竹棚的安全性存在重大担忧。本文对脚手架最常用的支架——I形金属支架的失效行为进行了研究。对39×I型金属支架进行了均布载荷试验,分析了其在不同锚固位置的力学性能和失效机理。所获得的测试数据用于建立支架的有限元模型。然后制定了支架失效的标准,并根据测试数据进行了校准。然后对一组重新设计尺寸的新型I形金属支架进行了测试,以验证所提出的失效标准。结果表明,所提出的失效准则与实验结果吻合良好。因此,推荐一套规则用于I形金属支架的极限状态设计。所提出的失效标准和设计规则可用于为工业设计具有更高安全性和可靠性的I形金属支架。
{"title":"Failure Behaviour and Design of I-shape Metal Brackets for Truss-out Bamboo Scaffolding","authors":"Chaobo Zhang, Chih-Chen Chang","doi":"10.33430/V26N1THIE-2018-0006","DOIUrl":"https://doi.org/10.33430/V26N1THIE-2018-0006","url":null,"abstract":"For many decades, truss-out bamboo scaffolding has been widely used in Hong Kong for maintaining and retrofitting structures. Yet there are major concerns about the safety of truss-out bamboo scaffoldings due to the metal brackets that support them frequently failing. This paper presents an investigation into the failure behaviour of the most commonly used support for scaffoldings: the I-shape metal bracket. Uniform distributed load (UDL) tests were performed on 39 × I-shape metal brackets to analyse their mechanical behaviour and failure mechanism in different anchorage locations. The test data obtained was used to establish a finite element model for the bracket. Criteria governing the failure of brackets were then developed and calibrated against the test data. A new set of I-shape metal brackets with redesigned dimensions were then tested to verify the proposed failure criteria. Results show that the proposed failure criteria match well with the experimental results. A set of rules is therefore recommended for the limit state design of the I-shape metal bracket. The proposed failure criteria and design rules could be used to design I-shape metal brackets for the industry that offer greater safety and reliability.","PeriodicalId":35587,"journal":{"name":"Transactions Hong Kong Institution of Engineers","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45142082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Trenchless construction of Phase IIIA District Cooling System (DCS) by TBM pipejacking and hand-dug tunnelling on Kai Tak Development : Part II – The challenges 启德发展计划第三期第二期区域供冷系统的隧道掘进机顶管及手挖隧道非开挖施工:第二部分-挑战
Q2 Engineering Pub Date : 2019-05-25 DOI: 10.33430/V26N1THIE-2017-0002
Wilson W S Mok, Victor K Lo, Germaine T M Chau, Louis Y M Lau
This paper discusses the challenges of constructing 1.75 km of concrete sleeve pipelines with diameters of 1,200mm, 1,500mm and 2,800mm using slurry operated Tunnel Boring Machines (TBMs) for installing District Cooling System (DCS) pipelines in highly variable ground conditions within the Kowloon Bay area. It covers the problems encountered, solutions provided, and recommendations made. Various construction techniques are also discussed including: running two TBMs in parallel from a jacking pit for the near simultaneous construction of two pipelines; enlarging the lower section of a receiving pit by the caving method to receive the TBM which entered the pit at an oblique angle, for turning inside the pit for removal after skin-off of the TBM; construction of a hand-dug tunnel from a receiving pit to receive three TBMs one at a time in a triangular configuration to suit site constraints. This paper should be read together with Part I which is entitled “Design and Construction Considerations” published in 2017.
本文讨论了在九龙湾地区高度多变的地面条件下,使用泥浆操作的隧道掘进机(tbm)建造直径为1,200毫米、1,500毫米和2,800毫米的1.75公里混凝土套管管道以安装区域供冷系统(DCS)管道的挑战。它涵盖了遇到的问题、提供的解决方案和提出的建议。本文还讨论了各种施工技术,包括:从顶坑平行运行两台掘进机,几乎同时施工两条管道;采用崩落法扩大接收坑的下部,以接收以斜角进入坑内的TBM,以便在TBM剥皮后在坑内转出;在接收坑中建造一条手工挖掘的隧道,以适应场地的限制,以三角形结构一次接收三台隧道掘进机。本文应与2017年出版的第一部分“设计和施工注意事项”一起阅读。
{"title":"Trenchless construction of Phase IIIA District Cooling System (DCS) by TBM pipejacking and hand-dug tunnelling on Kai Tak Development : Part II – The challenges","authors":"Wilson W S Mok, Victor K Lo, Germaine T M Chau, Louis Y M Lau","doi":"10.33430/V26N1THIE-2017-0002","DOIUrl":"https://doi.org/10.33430/V26N1THIE-2017-0002","url":null,"abstract":"This paper discusses the challenges of constructing 1.75 km of concrete sleeve pipelines with diameters of 1,200mm, 1,500mm and 2,800mm using slurry operated Tunnel Boring Machines (TBMs) for installing District Cooling System (DCS) pipelines in highly variable ground conditions within the Kowloon Bay area. It covers the problems encountered, solutions provided, and recommendations made. Various construction techniques are also discussed including: running two TBMs in parallel from a jacking pit for the near simultaneous construction of two pipelines; enlarging the lower section of a receiving pit by the caving method to receive the TBM which entered the pit at an oblique angle, for turning inside the pit for removal after skin-off of the TBM; construction of a hand-dug tunnel from a receiving pit to receive three TBMs one at a time in a triangular configuration to suit site constraints. This paper should be read together with Part I which is entitled “Design and Construction Considerations” published in 2017.","PeriodicalId":35587,"journal":{"name":"Transactions Hong Kong Institution of Engineers","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47078637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stability analysis of strain-softening slopes based on the gravity increase method 基于重力增加法的应变软化边坡稳定性分析
Q2 Engineering Pub Date : 2019-05-25 DOI: 10.33430/V26N1THIE-2017-0031
Wenmin Yao, Chong Ma, Zhang Wang, Xiaolong Chen
With traditional slope stability analysis methods, it is difficult to accurately describe the progressive failure process and dynamic variation law of slope stability. The strain-softening constitutive model was therefore used to simulate the progressive failure process of a strain-softening slope based on the gravity increase method (GIM), with the displacement interface employed to determine the sliding surface. A sensitive analysis of the characteristic parameters within the softening stage was then conducted. The results are as follows: There are similar space-time evolution laws of residual strength factor and shear strain increment, with failure starting from the slope toe and extending gradually. The sliding surface of strain-softening slopes is located between that of the slope with peak strength and the sliding surface of the slope with residual strength. The stability coefficient shows an exponential growth trend with the increase of residual cohesion and residual plastic shear strain threshold, with a positive linear correlation between the residual friction angle and stability factor. The residual friction angle is the most sensitive factor in slope stability, followed by the residualcohesion, with the residual plastic shear strain threshold being the least sensitive.
传统的边坡稳定性分析方法难以准确描述边坡稳定性的渐进破坏过程和动态变化规律。因此,采用应变软化本构模型,基于重力增加法(GIM)模拟应变软化边坡的渐进破坏过程,采用位移界面确定滑动面。然后对软化阶段的特征参数进行了敏感性分析。结果表明:残余强度因子和剪切应变增量具有相似的时空演化规律,破坏从坡脚开始,逐渐扩展;应变软化边坡的滑动面位于峰值强度边坡的滑动面与残余强度边坡的滑动面之间。稳定系数随残余黏聚力和残余塑性剪切应变阈值的增加呈指数增长趋势,残余摩擦角与稳定系数呈线性正相关。残余摩擦角是影响边坡稳定性的最敏感因素,其次是残余酒精黏结力,残余塑性剪切应变阈值最不敏感。
{"title":"Stability analysis of strain-softening slopes based on the gravity increase method","authors":"Wenmin Yao, Chong Ma, Zhang Wang, Xiaolong Chen","doi":"10.33430/V26N1THIE-2017-0031","DOIUrl":"https://doi.org/10.33430/V26N1THIE-2017-0031","url":null,"abstract":"With traditional slope stability analysis methods, it is difficult to accurately describe the progressive failure process and dynamic variation law of slope stability. The strain-softening constitutive model was therefore used to simulate the progressive failure process of a strain-softening slope based on the gravity increase method (GIM), with the displacement interface employed to determine the sliding surface. A sensitive analysis of the characteristic parameters within the softening stage was then conducted. \u0000\u0000The results are as follows: \u0000There are similar space-time evolution laws of residual strength factor and shear strain increment, with failure starting from the slope toe and extending gradually. The sliding surface of strain-softening slopes is located between that of the slope with peak strength and the sliding surface of the slope with residual strength. The stability coefficient shows an exponential growth trend with the increase of residual cohesion and residual plastic shear strain threshold, with a positive linear correlation between the residual friction angle and stability factor. The residual friction angle is the most sensitive factor in slope stability, followed by the residualcohesion, with the residual plastic shear strain threshold being the least sensitive.","PeriodicalId":35587,"journal":{"name":"Transactions Hong Kong Institution of Engineers","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44402281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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Transactions Hong Kong Institution of Engineers
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