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Behaviors of recycled aggregate concrete-filled steel tubular columns under eccentric loadings

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Frontiers of Structural and Civil Engineering 2019年第3期13卷 628-639页

作者： vivian w.y.TAM Jianzhuang XIAO Sheng LIU Zixuan CHEN Department of Structural Engineering Tongji UniversityShanghai 200092China University of western Sydney School of ComputingEngineering and Mathematics and Institute for Infrastructure EngineeringLocked Bag 1797PenrithNSW 2751Australia

The paper investigates the behaviors of recycled aggregate concrete-filled steel tubular(RACFST)columns under eccentric loadings with the incorporation of expansive agents.A total of 16 RACFST columns were tested in this *** main parameters varied in this study are recycled coarse aggregate replacement percentages(0%,30%,50%,70%,and 100%),expansive agent dosages(0%,8%,and 15%)and an eccentric distance of compressive load from the center of the column(0 and 40 mm).Experimental results showed that the ultimate stresses of RACFST columns decreased with increasing recycled coarse aggregate replacement percentages but appropriate expansive agent dosages can reduce the decrement;the incorporation of expansive agent decreased the ultimate stresses of RACFST columns but an appropriate dosage can increase the deformation *** recycled coarse aggregate replacement percentages have limited influence on the ultimate stresses of the RACFST columns and has more effect than that of the normal aggregate concretesteel tubular columns.

关键词： concrete filled steel tubes recycled aggregate concrete columns expansive agent eccentric load

Comparing material wastage levels between conventional in-situ and prefabrication construction in Hong Kong

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Journal of Harbin Institute of Technology(New Series) 2004年第5期11卷 548-551页

作者： vivian w.y.am C M Tam L y Shen Dept. of Building and Construction City University of Hong Kong Hong Kong ChinaDept. of Building and Construction City University of Hong Kong Hong Kong ChinaDept. of Building and Construction City University of Hong Kong Hong Kong China

Generation of construction wastes constitutes a major impact to the environment. Studies have been directed toward reducing wastes of the various construction processes. However, contractors in Hong Kong are rather conservative and lack motivation to develop new technology for waste minimization. This paper examines the benefits of using prefabrication in reducing material wastage levels for some traditional in-situ trades such as concreting, rebar fixing, bricklaying, drywall, plastering, screeding and tiling in Hong Kong. By measuring thirty construction projects, it is been found that waste levels of all major construction trades can be effectively reduced. This is particularly significant in the trade of plastering where 100% saving can be achieved after adopting prefabrication. The standardized design of the building can also be useful in the adoption of prefabrication for private housing projects.

关键词： prefabrication conventional in-situ trades material wastage environment

Test and prediction of chloride diffusion in recycled aggregate concrete

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Science China(Technological Sciences) 2014年第12期57卷 2357-2370页

作者： XIAO Jian Zhuang yING Jing wei TAM vivian w.y.GILBERT Ian R Department of Structural Engineering College of Cvil Engineering Tongji University School of Civil Engineering and Architecture Guangxi University University of western Sydney School of Computing Engineering and Mathematics Locked Bag 1797Penrith NSW 2751 Australia School of Civil and Environmental Engineering The University of New South Wales

Recycled aggregate concrete （RAC） specimens with different recycled zoarse aggregate replacement ratios by mass （R） are fully immersed in a 10% chloride solution for 235 days. Both free chloride concentration （CI） and total chloride concentration （Ct） are then measured employing a rapid chloride test （RCT） system. The Fick＇s second diffusion law is verified by the test data and used to predict chloride concentration distribution at different immersion periods. Addilionally, pore structures of the new and old mortar in RAC are tested by mercury intrusion porosimetrV （MIP）. It is found that bind- ing chloride concentration （Cb） linearly increases with Cf. In natural aggregate concrete （NAC）, Cf is obviously smaller than that in the RAC in the same testing environment and this is different from the test results of Ct and Cb. Furthermore, the effects of R on the chloride concentration of RAC become severe for specimens subjected to long immersion periods, which can be explained in terms of the pore structures of the new mortar and old adhesive mortar in RAC.

关键词： recycled aggregate concrete (RAC) chloride diffusion rapid chloride test (RCT) pore structure Fick's second diffu-sion law chloride binding

6-weekly bevacizumab versus 4-weekly ranibizumab for neovascular age-related macular degeneration:a 2-year outcome

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International Journal of Ophthalmology(English edition) 2016年第4期9卷 551-555页

作者： Patrick J Chiam vivian w Ho Nicholas M Hickley Venkat Kotamarthi St.Paurs Eye Unit Royal Liverpool University HospitalLiverpool L7 8XPUK Eye Care Centre Leighton HospitalCrewe CW1 4Q JUK Eye Department Leicester Royal InfirmaryLeicester LE15WWUK

AIM： To compare visual acuity and central macular thickness（CMT） changes in neovascular age-related macular degeneration patients treated with either 6weekly bevacizumab regimen or 4 weekly ranibizumab on an as required basis.·METHODS： Patients made an informed choice between bevacizumab 1.25 mg or ranibizumab 0.5 mg. The selected treatment was administered in the first 3 *** patients were followed-up 6 weekly and ranibizumab 4 weekly. Retreatment criteria was based on the reduction of 〉5 letters in the best-corrected visual acuity（BCVA）, the presence of retinal fluid on optical coherence tomography（OCT） or new retinal haemorrhage.·RESULTS： Visual acuity at 2y bevacizumab patients gained 7. 0 letters and ranibizumab 9. 2（ P = 0. 31, 95 %CI-6.4 to 2.0）. At 2y 86% of bevacizumab and 94%ranibizumab patients had not lost 15 letters or more（P =0.13）. Mean CMT decreased at 2y bevacizumab by 146 μm,ranibizumab 160 μm（P =0.72）. Mean number of injections was at 2y bevacizumzb 11.9, ranibizumab 10.3（P =0.023）.· CONCLUSION： Bevacizumab 6 weekly on an as required basis was not demonstrably non-inferior to ranibizumab 4 weekly pro re nata（prn） in terms of BCVA and change in CMT. In the bevacizumab group, one more injection was required in the second year compared to the ranibizumab group.

关键词： bevacizumab ranibizumab neovascular age-related macular degeneration treatment on as required basis

Concrete waste recycling in Australia

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Concrete waste recycling in Australia

A review of deep learning methods for pixel-level crack detection

首届全国再生混凝土研究与应用学术交流会

作者： vivian w.y.Tam Griffith School of Engineering Griffith University

＜正＞waste generated from construction and building demolition work constitutes about 42% of all solid waste generated each year in ***,it has created a serious waste management *** various types of materials,concrete constituents more than 80% of the total construction and demolition waste *** aggregate can be produced from the crushed demolished concrete waste for concrete *** paper examines the existing concrete waste recycling practice in Australia."Guide to the use of recycled concrete and masonry materials"has been developed by Commonwealth Scientific and Industrial Research Organization in Australia for controlling quality of recycled aggregate and applications of recycled aggregate *** to improve the existing implementation of concrete recycling are also suggested.

关键词： waste management recycling construction and demolition waste recycled aggregate recycled aggregate concrete Australia.

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第6期9卷 945-968页

作者： Hongxia Li weixing wang Mengfei wang Limin Li vivian Vimlund School of Information Engineering Chang'an UniversityXi'an 710064China School of Computer Baoji University of Arts and SciencesBaoji 721013China School of Electrical and Electronic Engineering Wenzhou UniversityWenzhou 325035China Department of Computer Science and Technology Linkoping UniversityLinköpingSweden

Cracks are a major sign of aging transportation *** detection and repair of cracks is the key to ensuring the overall safety of the transportation *** recent years,due to the remarkable success of deep learning(DL)in the field of crack detection,many researches have been devoted to developing pixel-level crack image segmentation(CIS)models based on DL to improve crack detection accuracy,but as far as we know there is no review of DL-based CIS methods *** address this gap,we present a comprehensive thematic survey of DL-based CIS *** review offers several contributions to the CIS ***,more than 40 papers of journal or top conference most published in the last three years are identified and collected based on the systematic literature review ***,according to the backbone network architecture of the models proposed in them,they are grouped into 10 topics:FCN,U-Net,encoder-decoder model,multi-scale,attention mechanism,transformer,two-stage detection,multi-modal fusion,unsupervised learning and weakly supervised learning,to be ***,our survey focuses on discussing strengths and limitations of the models in each topic so as to reveal the latest research progress in the CIS ***,publicly accessible data sets,evaluation metrics,and loss functions that can be used for pixel-level crack detection are systematically introduced and summarized to facilitate researchers to select suitable components according to their own research ***,we discuss six common problems and existing solutions to them in the field of DL-based CIS,and then suggest eight possible future research directions in this field.

关键词： Crack image segmentation Crack detection Convolutional neural networks Deep learning Systematic literature review

Can public report cards affect consumer’s private learning of quality? An evaluation of the impact of Florida hospital report cards on acute myocardial infarction patient admission patterns

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Health 2013年第12期5卷 2181-2189页

作者： vivian y. wu Pai Liu Palo Alto Research Center Palo Alto USA Sol Price School of Public Policy Schaeffer Center for Health Policy and Economics University of Southern California Los Angeles USA

The empirical literature on hospital report cards typically assumes that report card cannot interact with consumer’s private learning. This study examines the impact of the implementation of FL hospital quality reporting system in late 2004 on hospital admission patterns using a pre-post difference-in-difference design. The estimation model allows for the possibility that report-card learning may interact with non-report-card learning. The study sample is comprised of all patients admitted to any FL hospital between 2000 and 2008 with a principal diagnosis of acute myocardial infarction (AMI). we find that hospital admission patterns for AMI patients did not respond to report card information. However, we find evidence consistent with the possibility that the implementation of a report card system may stimulate consumers (either patients or physicians) to seek higher quality hospitals through private information channels.

关键词： Hospital Report Cards Hospital Admission Pattern Private Learning

钙离子通道调节剂在神经元的生长锥的作用及临床意义（英文）

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中国药理学与毒理学杂志 2016年第6期30卷 640-655页

作者： Ji-Sun KIM vivian ySZETO 冯中平 Department of Physiology University of Toronto 1 King's College Circle

钙是神经发育过程中重要的信号分子,其生物学功能通过众多的钙离子通道、交换蛋白及钙结合蛋白来实现。在神经发育过程中,神经元的生长锥利用钙离子的浓度差来进行正确爬行,并最终引导轴突向正确的方向生长。然而,如果钙离子通道出现功... 详细信息

钙是神经发育过程中重要的信号分子,其生物学功能通过众多的钙离子通道、交换蛋白及钙结合蛋白来实现。在神经发育过程中,神经元的生长锥利用钙离子的浓度差来进行正确爬行,并最终引导轴突向正确的方向生长。然而,如果钙离子通道出现功能障碍,将会引起生长锥错误地爬行,从而导致神经发育相关疾病的发生。了解特异性表达于生长锥的钙通道,并获得能调控这些钙通道的调节剂对于治疗神经发育相关疾病至关重要。这些调节剂可能已广泛用于其他组织病变,如心血管疾病的治疗。但它们对生长锥上钙通道的调控仍有待进一步研究。最近的研究表明,离子通道调节剂可以作为治疗神经发育相关疾病的药物靶标。本文讨论钙通道调节剂在生长锥引导轴突生长过程中的潜在作用。

关键词：钙生长锥 L型钙离子通道兰尼碱受体钙释放通道肌醇(1 4 5)-三磷酸受体

Competitive market forces and trends in US hospital spending, 2001-2009

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Health 2013年第7期5卷 1195-1200页

作者： vivian y. wu yu-Chu Shen Glenn Melnick Naval Postgraduate School Monterey USA University of Southern California Los Angeles USA

Objectives: To investigate components of the rapidly increasing trend in hospital spending in the 2000’s and their relationship to market structure. Study Design: Aggregate time series and multivariate analysis are conducted to test whether hospital spending growth is driven by price or quantity and how recent hospital spending growth is related to health plan and hospital market structure. Method: Hospitals are grouped into strong and weak competitive markets based on the relative concentration of hospital and health plan markets as well as managed care penetration. Results: Inflation adjusted hospital spending grew much faster than gross domestic product (GDP) throughout the 2000s. Regression results show that rapid growth was observed across all hospital markets—even in those markets where price competitive market forces are the strongest and that rising hospital prices, and not utilization explain most of the increases in hospital spending. Conclusions: Hospital spending exceeded the consumer price index (CPI) by a substantial margin in the 2000’s due in part to weakening competitive market forces, which had a dampening effect on spending and especially prices. Unless competition is restored, the cost of health care for consumers, employers and public payers can be expected to increase.

关键词： Hospital Spending Prices Utilization Competitive Markets