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arXiv 2023年

作者： Picelli, Renato Ranjbarzadeh, Shahin Sivapuram, Raghavendra dos Santos Gioria, Rafael Silva, Emílio Carlos Nelli Department of Naval Architecture and Ocean Engineering Polytechnic School of the University of São Paulo SP Brazil Department of Mechatronics and Mechanical Systems Engineering Polytechnic School of the University of São Paulo SP Brazil Structural Engineering Department University of California San DiegoCA United States Department of Mining and Petroleum Engineering Polytechnic School of the University of São Paulo SP Brazil

Topology optimization methods face serious challenges when applied to structural design with fluid-structure interaction (FSI) loads, specially for high Reynolds fluid flow. This paper devises an explicit boundary method that employs separate analysis and optimization grids in FSI systems. A geometry file is created after extracting a smooth contour from a set of binary design variables that defines the structural design. The FSI problem can then be modeled with accurate physics and explicitly defined regions. The Finite Element Method is used to solve the fluid and structural domains. This is the first work to consider a turbulent flow in the fluid-structure topology optimization framework. The fluid flow is solved considering the k−Ε turbulence model including standard wall functions at the fluid and fluid-structure boundaries. The structure is considered to be linearly elastic. Semi-automatic differentiation is employed to compute sensitivities and an optimization problem using binary design variables is solved via sequential integer linear programming. The fluid loading is linearly interpolated in order to provide the sensitivities of the fluid flow on the fluid-structure interfaces. Results show that the proposed methodology is able to provide structural designs with smooth boundaries considering loads from low and high Reynolds flow. © 2023, CC BY.

关键词： Structural design

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Fluorescence-Based Approach for Monitoring Perfluorooctanoic Acid (PFOA) and Perfluorooctanesulfonic Acid (PFOS) During Granular Activated Carbon (GAC) Adsorption

Fluorescence-Based Approach for Monitoring Perfluorooctanoic...

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International Conference on Wider-Uptake of Water Resource Recovery from Wastewater Treatment, ICWRR 2024

作者： Marino, Luigi Gagliano, Erica Sgroi, Massimiliano Anumol, Tarun Snyder, Shane A. Korshin, Gregory Roccaro, Paolo Department of Civil Engineering and Architecture University of Catania Viale A. Doria 6 Catania Italy Department of Civil Chemical and Environmental Engineering University of Genoa Via all’Opera Pia 15 Genoa Italy Department of Science and Engineering of Materials Environment and Urban Planning-SIMAU Marche Polytechnic University Via Brecce Bianche 12 Ancona60131 Italy Department of Chemical and Environmental Engineering University of Arizona 1133 E. James E. Rogers Way TucsonAZ85721 United States Nanyang Technological University Nanyang Environment and Water Research Institute 1 Cleantech Loop CleanTech One #06-08 Singapore637141 Singapore Department of Civil and Environmental Engineering University of Washington Box 352700 SeattleWA98195-2700 United States

ISBN: (纸本)9783031633522

This study explores the GAC adsorption of perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), that stands out as the most frequently produced and detected compounds belonging to the class of poly- and perfluoroalkyl substances (PFAS). Experiments were performed on three distinct wastewaters (WW-1, WW-2, WW-3) employing rapid small scale column tests (RSSCTs). RSSCTs were carried out at the same empty bed contact time (EBCT) using a commercially available GAC. Parallel factor analysis (PARAFAC) was used to deconvolute fluorescence EEMs. Four independent PARAFAC components were found. High linear correlations were found between the PFAS breakthrough and the breakthrough of the PARAFAC components during the GAC process for WW-1, WW-2 and WW-3. In particular, the PARAFAC component C3, representative of the protein tryptophan-like fluorescence region, lead to high accuracy prediction models of PFOA and PFOS breakthough. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Fluorescence

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The effect of pore structure on the pessimum effect of salt scaling: A perspective from cryogenic liquid transport and ice pressure

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Cement and Concrete Research 2025年 196卷

作者： Deng, Qian Zhuang, Weitan Zhang, Xuzhe Li, Shaohua Yu, Qingliang School of Civil Engineering Wuhan University Wuhan430072 China Department of the Built Environment Eindhoven University of Technology P.O. Box 513 Eindhoven5600 MB Netherlands School of Architecture and Civil Engineering Anhui Polytechnic University Wuhu241000 China

Salt scaling damage peaks at a specific salt concentration, known as the pessimum concentration. However, reported pessimum concentrations vary widely, lacking a theoretical explanation. The microstructure of concrete is an important characteristic influencing the freezing behavior of pore solution, which is often neglected in salt scaling studies. This study investigates the effect of concrete microstructure on the pessimum concentration by review, experiment, and modeling. The results show that the pessimum concentration increases from 3 % to 7 % as the water-binder ratio decreases from 0.4 to 0.2. An ice content and cryosuction model considering the role of salt and pore structure is developed to establish the relationship between cryogenic liquid transport and damage. The analysis reveals that the cryogenic permeability, as affected by ice formation in the pore system, plays a crucial role in determining the pessimum concentration. A decrease in porosity and critical pore diameter reduces the cryogenic permeability, resulting in lower liquid absorption at low concentrations, and increasing the pessimum concentration. © 2025 The Authors

关键词： Liquid nitrogen

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Electrochromic window integration in adaptive building envelopes in different climates: A genetic optimization of switchable glazing parameters to reduce energy consumptions in office buildings 8

Electrochromic window integration in adaptive building envel...

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8th International Building Physics Conference, IBPC 2021

作者： Carlucci, F. Cannavale, A. Fiorito, F. Department of Civil Environmental Land Building Engineering and Chemistry Polytechnic University of Bari Bari70125 Italy Department of Sciences in Civil Engineering and Architecture Polytechnic University of Bari Bari70125 Italy Via Monteroni Lecce73100 Italy

During last decades, many efforts have been made to address challenges regarding building energy consumption. A particularly interesting and effective field of development in the building domain is represented by responsive technologies applied to transparent envelopes. Among these technologies, the electrochromic (EC) glazing is one of the most developed solutions thanks to its capability to dynamically modulate daylight and thermal radiation, simply applying a controlled external voltage. The aim of this study is to provide a methodology to analyse smart responsive technologies and optimize the properties of an ideal switchable glazing to find the best configuration for a medium office in different climatic zones. The genetic optimization considers a 5-elements genome, constituted of the following genes: i) solar heat gain coefficient in bleached (SHGCB) and ii) coloured state (SHGCC), iii) visible light transmittance in bleached (VLTB) and iv) coloured state (VLTC) and v) thermal transmittance (U). Moreover, different European cities were selected as representative of different climatic zones and results obtained give a set of ideal EC glazing configurations in the case of EC window controlled by daylighting sensors. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Office buildings

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Cartilage-inspired hydrogel lubrication strategy

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The Innovation 2022年第5期3卷 11-12页

作者： Wenzhao Li Junying Lai Yan Zu Puxiang Lai Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325001China Oujiang Laboratory Zhejiang Lab for Regenerative MedicineVision and Brain HealthWenzhou 325001China College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China Department of Biomedical Engineering Hong Kong Polytechnic UniversityHong Kong SARChina Shenzhen Research Institute Hong Kong Polytechnic UniversityShenzhen 518057China Photonics Research Institute Hong Kong Polytechnic UniversityHong Kong SARChina

In nature,when two solid interfaces contact and slide with each other,adverse friction and wear *** is an important means to reduce *** film lubrication and boundary lubrication are the most typical lubrication paradigms that are different in the principle of formation.1 More generally,in fluid film lubrication mode,the two sliding surfaces are completely separated by a fluid film with a thickness much larger than the surface *** this time,the energy dissipation is mainly caused by the fluid being *** lubrication occurs when two surfaces are in molecular contact,and the energy dissipation mainly comes from van der Waals force,Coulomb force,and dis-entanglement of surface ***,boundary lubrication is directly related to the physical and chemical properties of the surface.

关键词： friction lubrication wear

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Design of Smart Lighting and Security System using Intelligent Controller

Design of Smart Lighting and Security System using Intellige...

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Mobile Computing and Sustainable Informatics (ICMCSI), International Conference on

作者： Deepak T. Patil Shivagond Teli Kaparthi Uday Rajkumar S Sawant A. Antony Fernandez W. Rajan Babu Bharati Vidyapeeth College of Architecture Navi Mumbai Department of Mechanical Engineering Bharati Vidyapeeth College of Engineering Navi Mumbai Department of Electronics and Instrumentation Engineering CVR College of Engineering Hyderabad Department of Engineering and Technology Bharati Vidyapeeth Deemed University Navi Mumbai Christ the King Polytechnic College Coimbatore Department of Electrical and Electronics Engineering Sri Eshwar College of Engineering Coimbatore

It is necessary to use sufficient lighting and HVAC system along with the protection to each building or houses. Proper lighting system is achieved by connecting the field devices or lights with controller and smart sensors. The controller is used to turn the lighting loads ON and OFF when the sensor input comes. Security of the building or house is achieved by installing an autonomous rover system with OV7670 Camera module. An autonomous rover is allowed to roam inside the house in all the room as per the pre taught or stored GPS positions. The motion of the rover is adjusted based on the obstacles, which are present in the motion path. The smoke sensor and OV7670 Camera module are installed in the top of the rove which is used to detect the fire and unauthorized entry of the person. OV7670 captured pictures are converted into pixels by Mean Square Error techniques. The sensor data are collected in the Arduino controller and the same is transmitted to the owner’s smart phone via ESP2886 Wi-Fi Module. MQ2 smoke sensors are mounted over the rover for sensing the smoke and hazardous gas leakages. The buzzer or alarm will be activated when there is any security threatening inside the building by the controller.

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The development of the smart factory during the Industry 4.0 period under the study of system thinking 23

The development of the smart factory during the Industry 4.0...

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Proceedings of the 2023 International Conference on Artificial Intelligence, Systems and Network Security

作者： Zhenquan Zhou Lanxin Wang Chenxin Tian Deprizon Syamsunur School of Architecture and Engineering Tianfu College of SWUFE China and Department of Civil Engineering Faculty of Engineering Technology and Built Environment UCSI University Malaysia School of Electronical and Information Engineering Chengdu Aeronautic Polytechnic China Department of Civil and Environmental Engineering The University of Auckland New Zealand Department of Civil Engineering Faculty of Engineering Technology and Built Environment UCSI University Malaysia

ISBN: (纸本)9798400716966

Following introducing the Industrial Revolution 4.0 framework in 2013, many industrialised nations have implemented this new industrial paradigm. The smart factory is a fundamental concept imperative for successfully implementing the Fourth Industrial Revolution. Many scholars and specialists contend that the ongoing advancement of smart factories will transform the industrial structure. This study aims to examine the status of smart factories, exploring the development and management of the smart factory during the Industry 4.0 period under the study of system thinking. This work extensively explores the distinctive notion and presents individual anecdotes regarding the development, execution, arrangement, and administration of intelligent factories by individuals. The research employs multiple methodologies, such as system thinking of relevant literature and systematic analysis of the proposed complex project. The findings suggest that incorporating intricate system thinking, appropriate technology integration, efficient simulation and machine learning employment, and a responsive monitoring and feedback mechanism are crucial in establishing and managing intelligent manufacturing facilities. External factors and governing constraints need to be considered during the lifecycle of treating complexity. This report offers a thorough and analytical evaluation of developing the smart factory during the Fourth Industrial Revolution, serving as a scholarly resource for further exploration of related subject areas. A further investigation plans to consider deep data collection.

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Prediction of mechanical and physical properties of spent bleaching earth based fired bricks: an experimental study using RSM and ANN

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Asian Journal of Civil engineering 2024年第8期25卷 5811-5833页

作者： Bouzidi, M.A. Bouzidi, N. Quesada, D. Eliche Faculty of Technology Laboratory of Construction Engineering and Architecture (LGCA) University of Bejaia Bejaia 06000 Algeria Faculty of Technology Materials Technology and Process Engineering Laboratory (LTMGP) University of Bejaia Bejaia 06000 Algeria Center for Advanced Studies in Earth Sciences Energy and Environment (CEACTEMA) University of Jaén Campus Las Lagunillas S/N Jaén 23071 Spain Department of Chemical Environmental and Materials Engineering Higher Polytechnic School of Jaén University of Jaen Campus Las Lagunillas S/N Jaén 23071 Spain

In this study, Artificial Neural Networks (ANN) and Response Surface Methodology (RSM) are used to develop models to predict compressive strength, thermal conductivity, porosity and water absorption of eco-friendly fired clay bricks containing different amounts of water, percentages of spent bleaching earth (SBE) and, firing temperatures. Water content was varied between 5 and 8 wt.%, SBE was varied in the range of 0 to 50 wt.% and, firing temperature ranges from 800 to 950 °C. The fired bricks properties were strongly influenced by the SBE content and fairing temperature as confirmed by the SEM images. The percentages of water strongly influenced the compressive strength but had less influence on the porosity and water absorption and no influence on the thermal conductivity. The statistical values for both RSM and ANN models: (coefficient of determination (R²), adjusted coefficient of determination (R²_adj), mean square error (MSE), root mean square error (RMSE) and relative percent deviation (RDP)), were used to compare the two models. The results reveal high correlation coefficients, adjusted coefficients and low root mean square errors. The models were found robust and accurate in their predictions. Based on these results, the RSM and ANN models can be applied as an effective tool to predict compressive strength, thermal conductivity, porosity, and water absorption of fired bricks. Nevertheless, the artificial neural network model showed better accuracy. Graphical Abstract: (Figure presented.) © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Artificial neural network Clay bricks Environment Mechanical properties Response surface methodology Thermal conductivity

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Size-Dependent Model to Predict the Flexural Strength of 3d Printed Ecc Beams

SSRN

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SSRN 2024年

作者： Yu, Jie Teng, Fei Ye, Junhong Zhang, Dong Yu, Kequan Yu, Jiangtao Dai, Jian-Guo Weng, Yiwei Department of Building and Real Estate The Hong Kong Polytechnic University China Department of Disaster Mitigation for Structures College of Civil Engineering Tongji University China Coll Civil Engineering Fuzhou University Fuzhou350108 China Department of Architecture and Civil Engineering City University of Hong Kong China

Engineered cementitious composites (ECC), with superior tensile properties, have the potential to construct self-reinforced structures and address the reinforcement integration problem in 3D concrete printing. However, a predictive methodology is lacking to establish a connection between the material properties of ECC and the structural strength of ECC members by taking the size effect into account. To fill the research gap, this study developed a size-dependent model to predict the flexural strength of 3D printed ECC beams. The proposed model relates the flexural strength to beam sizes based on a stochastic tensile constitutive model of ECC. ECC beams with three spans were printed and tested by four-point bending (240 mm, 300 mm, and 450 mm). The results showed that the size-dependent model can predict the flexural strength with an approximate accuracy of 90%. Compared to the size-independent model, the proposed size-dependent model improved the prediction accuracy by approximately 60%. The force analysis of the shear strength of interlayers further revealed that interfacial bonding has a negligible impact on the simulated flexural strength. Consequently, the developed size-dependent model has the potential to guide the structural design of 3D printed ECC beams. © 2024, The Authors. All rights reserved.

关键词： Forecasting

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Study on Exsolution Process of Sr2FeMo0.6Ni0.4O6 via in Situ Cathodic Polarization

Study on Exsolution Process of Sr2FeMo0.6Ni0.4O6 via in Situ...

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243rd ECS Meeting

作者： Duranti, L. Felli, A. Marelli, M. Dosa, M. Di Bartolomeo, E. Piumetti, M. Boaro, M. Department of Chemical Science and Technologies University of Rome Tor Vergata Via della Ricerca Scientifica Rome00133 Italy Polytechnic Department of Engineering and Architecture University of Udine Via Cotonificio 108 Udine33100 Italy Institute of Chemical Science and Technology-CNR Via Fantoli 16/17 Milan20138 Italy Department of Applied Science and Technology Polytechnic of Turin Corso Duca degli Abruzzi 24 Turin10129 Italy

ISBN: (纸本)9781607685395

In this work, the behavior of the double perovskite Sr2FeMo0.6Ni0.4O6-δ (SFMN) under cathodic polarization was investigated. The structural changes due to the exsolution process caused by polarization or by chemical reduction were studied by X-ray diffractometry and by electron microscopies and electrochemical performances of a H2-Solid Oxide Fuel Cells (SOFCs) electrode were analyzed to clarify the role of the different phenomena involved in the structural transformation of the double perovskite. © The Electrochemical Society.

关键词： X ray diffraction analysis

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