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A GIS-BASED PROCEDURE FOR MEASURING THE EFFECTS OF THE built environment ON URBAN FLASH FLOODS

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Journal of Green Building 2016年第3期11卷 110-125页

作者： Yan Li Chunlu Liu school of Architecture and built environment Deakin UniversityGeelong Australia

Urban flooding has been a severe problem for many cities around the world as it remains one of the greatest threats to the property and safety of human *** Australia,it is seen as the most expensive natural ***,urban areas that are impervious to rainwater have been sharply increasing owing to booming construction activities and rapid *** change in the built environment may cause more frequent and longer duration of flooding in flood-prone urban ***,the flood inundation issue associated with the effects of land uses needs to be explored and *** research constructs a framework for modelling urban flood *** rainfall events are then designed for examining the impact on flash floods generated by land-use ***-ment is formulated for changes of topographical features over a real time *** Information System(GIS)technologies are then utilised to visual-ise the effects of land-use changes on flood inundation under different types of *** on a community-based case study,the results reveal that the built environment leads to varying degrees of aggravation of urban flash floods with dif-ferent storm events and a few rainwater storage units may slightly mitigate flood-ing extents under different storm ***,it is recommended that the outcomes of this study could be applied to flood assessment measures for urban development and the attained results could be utilised in government planning to raise awareness of flood hazard.

关键词： land use GIS Numerical simulation Facility construction Stormwater management

Effect of a portable ultra-clean exponential airflow unit on the particle distribution in an operating room

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Particuology 2015年第1期13卷 170-178页

作者： Sasan Sadrizadeh Sture Holmberg Division of Fluid and Climate Technology School of Architecture and the Built EnvironmentKTH Royal Institute of Technology

The effects of a mobile laminar airflow unit on the concentration, deposition and distribution of bacteria- carrying particles in an operating room are investigated. The exploration is carried out using numerical calculation schemes （computational fluid dynamics approach）. The model validation was performed through result comparisons with published measurement data from literature. Two types of mobile screen units were evaluated as an extension of turbulent-mixing operating-room ventilation. Airborne particle concentration/sedimentation was recorded with and without a screen unit on the operating table and two instrument tables. Both active and passive air sampling were examined and the results are compared. It was found that the additional mobile ultra-clean laminar airflow unit reduces the counts of airborne bacteria and surface contamination to a level acceptable for infection-prone surgeries.

关键词： Computational fluid dynamics Bacteria-carrying particle Surgical-site infection Hospital operating room Air quality Active-passive air sampling

Laser assisted phase transformation of carbon-based transition metal oxide electrode for high-performance supercapacitor application

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Science China Chemistry 2025年

作者： Mingzhen Xiu Jianghong Zhang Yu Lu Xun Cao Kang Huang Siyu Zhu Bowei Zhang Yu Liang Chunwang Zhao Junsheng Wu Yizhong Huang school of Materials Science and Engineering Nanyang Technological University Energy Research Institute Interdisciplinary Graduate Programme Nanyang Technological University Institute of Sustainability for Chemicals Energy and Environment Agency for Science Technology and ResearchSingapore Institute of Advanced Materials and Technology University of Science and Technology Beijing school of Materials Science and Technology Shenyang University of Chemical Technology school of Materials Science and Hydrogen Energy Foshan University

Transitional metal oxides have a wide range of applications due to their superior *** enhanced performance of metal oxide relies on their desirable oxidation states,which is challenging to achieve and requires complex *** study demonstrates a facile strategy enabling rapid phase transformation of transition metal *** approach involves synthesis of a tetragonal Mn3O4/carbon cloth composite using the liquid plasma discharge deposition （LPDD） technique,followed by laser irradiation with the presence of ethylene glycol under an N2gas *** resulting face-centered cubic MnO/carbon cloth electrode exhibits an excellent capacitance of 1,125 F g-1at 2 A g-1,with remarkable capacitance retention of 95%after10,000 *** approach can be extended to other transition metals including Co,Cu,Cr,Fe,Ni,and *** simulations reveal the significance of ethylene glycol and the underlying mechanism associated with the phase transformation of transition metal *** present study offers a powerful technique for the phase transformation of transition metal oxide which can guide the development of new electrode materials with enhanced electrochemical properties for high-performance energy storage applications.

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Numerical study of axial-loaded circular concrete-filled aluminum tubular slender columns

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Frontiers of Structural and Civil Engineering 2024年第2期18卷 272-293页

作者： Xudong CHEN Jeung-Hwan DOH Sanam AGHDAMY school of Engineering and built environment Griffith University Gold Coast CampusBrisbaneQLD 4222Australia

Aluminum alloys have been widely applied in coastal and marine structures because of their superior sustainability and corrosion ***-filled double-skin aluminum tubular columns(CFDAT)possess higher strength and better ductility than traditional reinforced concrete ***,few studies have been conducted on numerical simulation methods for circular ***,there has been no experimental or numerical study on intermediate-to-slender circular ***,a comprehensive numerical study was conducted on a modeling method for the first time to simulate the axial behavior of a slender circular *** study outlines the development of numerical modeling techniques and presents a series of comparative studies using various material nonlinearities,confinement effects,and nonlinearity of the initial geometric imperfections for a slender *** numerical results were compared with more than 80 previously available stub and slender experimental test results for *** was confirmed that the proposed numerical technique was reliable and accurate for simulating the axial behavior of intermediate and slender circular ***,a parametric study was conducted to investigate the effects of geometric and material properties on the axial capacity of the ***,the slenderness and strength-to-width ratio of CFDAT were compared with those of concrete-filled double-skin steel tubular columns(CFDST).The simulated axial strengths were compared with those predicted using AS 5100 and AISC *** design equations for the CFDATs should be proposed based on AS 5100.

关键词： axial behavior aluminum concrete-filled double-skin slender columns numerical modelling

Recent Advances in Computational Simulation of Macro-,Meso-,and Micro-Scale Biomimetics Related Fluid Flow Problems

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Journal of Bionic Engineering 2007年第2期4卷 97-107页

作者： Y. Y. Yan school of the built environment The University of Nottingham Nottingham NG7 2RD UK

Over the last decade, computational methods have been intensively applied to a variety of scientific researches and engineering designs. Although the computational fluid dynamics （CFD） method has played a dominant role in studying and simulating transport phenomena involving fluid flow and heat and mass transfers, in recent years, other numerical methods for the simulations at meso- and micro-scales have also been actively applied to solve the physics of complex flow and fluid-interface interactions. This paper presents a review of recent advances in multi-scale computational simulation of biomimetics related fluid flow problems. The state-of-the-art numerical techniques, such as lattice Boltzmann method （LBM）, molecular dynamics （MD）, and conventional CFD, applied to different problems such as fish flow, electro-osmosis effect of earthworm motion, and self-cleaning hydrophobic surface, and the numerical approaches are introduced. The new challenging of modelling biomimetics problems in developing the physical conditions of self-clean hydrophobic surfaces is discussed.

关键词： biomimetics computational simulation macro- meso- micro-scale hydrophobic surfaces

Molecular Dynamics Simulation of Behaviours of Non-Polar Droplets Merging and Interactions with Hydrophobic Surfaces

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Journal of Bionic Engineering 2008年第4期5卷 271-281页

作者： Y.Y. Yan C.Y. Ji school of the built environment University of Nottingham Nottingham NG7 2RD UK

This paper presents a molecular dynamics simulation of the behaviours of non-polar droplets merging and also the fluid molecules interacting with a hydrophobic surface. Such behaviours and transport phenomena are popular in general microchannel flow boiling and two-phase flow. The droplets are assumed to be composed of Lennards-Jones type molecules. Periodic boundary conditions are applied in three coordinate directions of a 3-D system, where there exist two liquid droplets and their vapour. The two droplets merge when they come within the prescribed small distance. The merging of two droplets apart from each other at different initial distances is tested and the possible larger （or critical） non-dimensional distance, in which droplets merging can occur, is discussed. The evolution of the merging process is simulated numerically by employing the Molecular Dynamics （MD） method. For interactions with hydrophobic solid wall, a system with fluid confined between two walls is used to study the wetting phenomena of fluid and solid wall. The results are compared with those of hydrophilic wall to show the unique characteristics of hydrophobic interactions by microscopic methods.

关键词： molecular dynamics simulation mist flow droplets merging hydrophobic wetting

Assessing the capacity of biochar to stabilize copper and lead in contaminated sediments using chemical and extraction methods

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Journal of environmental Sciences 2019年第5期31卷 91-99页

作者： Mingming Wang Liangsuo Ren Dayang Wang Zuansi Cai Xuefeng Xia Aizhong Ding College of Water Sciences Beijing Normal University school of Engineering and the built environment Edinburgh Napier University

Because of its high adsorption capacity, biochar has been used to stabilize metals when remediating contaminated soils; to date, however, it has seldom been used to remediate contaminated sediment. A biochar was used as a stabilization agent to remediate Cu-and Pb-contaminated sediments, collected from three locations in or close to Beijing. The sediments were mixed with a palm sawdust gasified biochar at a range of weight ratios(2.5%, 5%, and 10%) and incubated for 10, 30, or 60 days. The performance of the different treatments and the heavy metal fractions in the sediments were assessed using four extraction methods, including diffusive gradients in thin films, the porewater concentration, a sequential extraction, and the toxicity characteristic leaching procedure. The results showed that biochar could enhance the stability of heavy metals in contaminated sediments. The degree of stability increased as both the dose of biochar and the incubation time increased. The sediment p H and the morphology of the metal crystals adsorbed onto the biochar changed as the contact time increased. Our results showed that adsorption,metal crystallization, and the p H were the main controls on the stabilization of metals in contaminated sediment by biochar.

关键词： Biochar Sediment Heavy metal Stabilization assessment

VARIABILITY OF BUILDING SIMULATION RESULTS DEP ENDING ON SELECTED WEATHER FILES AND CONDITIONING SET POINTS-A CASE STUDY FOR A RESIDENTIAL BUILDING IN VICTORIA,AUSTRALIA

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Journal of Green Building 2016年第4期11卷 91-108页

作者： Astrid Roetzel school of Architecture and built environment Deakin UniversityGeelong Waterfront Campus

Building simulation is a powerful way to evaluate the performance of a *** quality of simulation results however strongly depends on the accuracy of simulation input *** for weather data files and occupant behaviour it is difficult to obtain accurate *** paper evaluates the variability of building simulation results with regards to different weather data sets as well as different heating and cooling set points for a residential building in Victoria,*** comfort accord-ing to ASHRAE Standard 55,final energy consumption and peak cooling and heating loads are *** have been performed with Energy-Plus,and weather data for a multi-year approach have been generated with the software *** results show that different weather files for the same location as well as different conditioning set points can influence the results by approximately a factor of 2.

关键词： weather data occupant behaviour heating and cooling set points residential building building simulation energy performance peak loads adaptive thermal comfort

MONITORING CARBON EMISSIONS IN PRECAST CONCRETE INSTALLATION THROUGH LEAN PRODUCTION–A CASE STUDY IN SINGAPORE

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Journal of Green Building 2014年第4期9卷 191-211页

作者： Peng Wu Department of Construction Management School of Built EnvironmentCurtin UniversityAustralia

The lean philosophy focuses on eliminating waste and maximizing productivity through the pull system,employee involvement,continuous improvement,*** has been discussed about the waste elimination and productivity improvement that can be achieved by applying the lean ***,as the consideration of the environment is becoming an increasingly important part of the construction culture,there is a need to investigate the applicability of the lean concept to achieve environmental sustainability,which is often used interchangeably with the term“green”.This research therefore aims to investigate the contribution of the lean concept to achieve low-carbon installation in precast concrete construction sites through a case study in *** life cycle assessment(LCA)results show that the lean concept can be adopted to reduce carbon emissions in terms of eliminating waste and inappropriate erection *** the installation cycle of a specific type of precast concrete column,an amount of 20.9kg carbon emissions(71.0%)is caused by wastes and inappropriate erection arrangements and can be reduced by applying lean principles through a detailed *** lean management practices in site layout,delivery,stock and erection management are identified in this *** on the results,contractors can start to apply lean principles to improve the installation cycle and eventually achieve low-carbon installation.

关键词： lean production prefabrication sustainable development carbon emissions life cycle assessment