ABSTRACT
Water use was impacted significantly by the COVID-19 pandemic. Although previous studies quantitatively investigated the effects of COVID-19 on water use, the relationship between water-use variation and COVID-19 dynamics (i.e., the spatial-temporal characteristics of COVID-19 cases) has received less attention. This study developed a two-step methodology to unravel the impact of COVID-19 pandemic dynamics on water-use variation. First, using a water-use prediction model, the water-use change percentage (WUCP) indicator, which was calculated as the relative difference between modeled and observed water use, i.e., water-use variation, was used to quantify the COVID-19 effects on water use. Second, two indicators, i.e., the number of existing confirmed cases (NECC) and the spatial risk index (SRI), were applied to characterize pandemic dynamics, and the quantitative relationship between WUCP and pandemic dynamics was examined by means of regression analysis. We collected and analyzed 6-year commercial water-use data from smart meters of Zhongshan District in Dalian City, Northeast China. The results indicate that commercial water use decreased significantly, with an average WUCP of 59.4%, 54.4%, and 45.7%during the three pandemic waves, respectively, in Dalian. Regression analysis showed that there was a positive linear relationship between water-use changes (i.e., WUCP) and pandemic dynamics (i.e., NECC and SRI). Both the number of COVID-19 cases and their spatial distribution impacted commercial water use, and the effects were weakened by restriction strategy improvement, and the accumulation of experience and knowledge about COVID-19. This study provides an in-depth understanding of the impact of COVID-19 dynamics on commercial water use. The results can be used to help predict water demand under during future pandemic periods or other types of natural and human-made disturbance.
ABSTRACT
PurposeThe COVID-19 health crisis has brought about a set of extra health and safety regulations, and procedures to the construction industry which could influence projects' economic performance (EP). The aim of this paper is to examine the effect of adopting COVID-19 safety protocols on construction sites on the economic performance (EP) of construction projects.Design/methodology/approachEmploying the survey method using a structured questionnaire, data were collected from small- and large-sized construction projects in Nigeria and analysed using partial least squares structural equation modelling (PLS-SEM) technique.FindingsThe findings reveal that job re-organization and sanitization have negative significant effects on EP, while social distancing and specific training have no effect on EP. Furthermore, project size moderates the relationship between job re-organization, sanitization, specific training and EP with the stronger effect on the relationships observed in big projects, except for the relationship between sanitization and EP where the moderating relationship is stronger in small projects. However, there is no significant moderating effect of project size on the relationship between social distancing and EP.Practical implicationsAs construction project sites continue to operate amidst strict safety protocols, this study offers theoretical and practical insights on how construction projects can adhere to the safety protocols while performing economically.Originality/valueThe originality of this study's findings stems from the fact that it is among the first to provide greater insight on how construction projects have fared economically considering the impact of the various COVID-19 protocols.
ABSTRACT
When the ethical responsibilities of engineers are discussed in classrooms, the focus is usually on microethics, which concentrates on individual decision-making, rather than macroethics, that addresses broad societal concerns. Pandemics (e.g., COVID-19) and natural disasters (e.g., hurricanes, derechos) have presented unique opportunities to observe engineering macroethical responsibilities, because unjust social, economic, and environmental systems have been brought to the forefront amidst the responses (e.g., inequitable transportation access). In this paper, we consider pandemics and natural disasters through the lens of engineering macroethics, aiming to understand students' perceptions about the macroethical responsibilities of engineers. In the fall of 2020, we deployed a survey to undergraduate engineering students at two universities (n=424). Students were asked to discuss what they perceived to be the role of engineering professionals in response to the global COVID-19 pandemic and natural disasters. We used a qualitative content analysis to explore the macroethical responsibilities mentioned in students' responses. Many of these responses include considerations of infrastructure resilience, resource distribution, and community equity. Logit models were used to identify which sociodemographic factors were associated with responses that included macroethical responsibilities, revealing engineering major (specifically, civil engineering), employment status, gender identity, and family size, among others as significant factors. The implications from this study include recommendations on curricular content, and identifying which student sociodemographic groups would especially benefit from macroethical content in coursework. © 2023 American Society of Civil Engineers.
ABSTRACT
PurposeReportedly, green roof (GR) makes a significant contribution towards a truly sustainable-built environment;however, its implementation is yet to hit a sufficient level in developing countries. Thus, this study assesses GR implementation strategies in developing countries by providing a comparative analysis through experts in Kazakhstan, Malaysia and Turkey.Design/methodology/approachThe study adopts a four-step methodological approach to achieve the research aim: literature review, focus group discussion, fuzzy analytical hierarchy process (FAHP) analysis and correlation analyses. First, a literature review followed by a focus group discussion is used to determine 18 (out of 25 initially) strategies for the selected context and these are classified into three categories: governmental and institutional support, knowledge and information and policy and regulation. Afterward, the identified GR strategies are evaluated using the FAHP with the data gathered from the experts in the countries studied. Finally, correlation analyses were used to observe the strength of agreement between the assessments of experts from the included countries.FindingsThe findings indicate that financial incentives, low-cost government loans and subsidies and tax rebates are the essential strategies for the wider adoption of GR. Evaluating the policy and regulations strategies also showed that mandatory GR policies and regulations and better enforcement of the developed GR policies are ranked as the most prominent strategies. The findings show a low level of agreement among respondents from Kazakhstan, while there is a high level of agreement between the experts in Malaysia and Turkey.Research limitations/implicationsThe research contribution is twofold. First (research implication), the study identifies the strategies through a complete literature review. Second, the identified strategies are evaluated through the lenses of experts in three developing countries which are hoped to provide (practical contribution) a better understanding of the most effective strategies that require attention and enable the frontline stakeholders (particularly government authorities) to focus on them.Originality/valueThe study findings provide a good point of departure to explore the strategies for broader adoption of GRs in developing economic setting.
ABSTRACT
Health service station is a place in which close contacts with the COVID-19 and other key populations are centralized quarantined for medical observation.A newly built health service station is equipped with 4 700 beds and a supporting sewage treatment station with a designed treatment scale of2 200 m~3/d.The treatment process consists of enhanced biological treatment system,sewage virus disinfection and sterilization system,aerosol disinfection and sterilization system and sludge disinfection and sterilization system.After treatment,the effluent and waste gas can meet the limit specified in Discharge Standard of Water Pollutants for Medical Organization （GB 18466-2005）.The average COD,NH3-N and SS in effluent are 14.53 mg/L,1.26 mg/L and 9.11 mg/L,respectively,and the average concentrations of H2S,NH3 and odor at the outlet are 0.01 mg/L,0.8 mg/L and 6.3,respectively.The sludge is disinfected regularly and then transported outside for disposal.This project can provide reference for sewage treatment design of emergency medical temporary isolation and observation facility and cabin hospital.
ABSTRACT
PurposeThis research presents a comprehensive review of the literature on the barriers to incorporating indoor environmental quality (IEQ) principles into building designs. The aim was to identify these barriers in the literature and subsume them under broad categories for the development of a framework showing the interrelationships among the barriers.Design/methodology/approachThe research design used a systematic desktop review which comprised of three levels of screening. The first level allowed for a broad selection of papers;the second level of screening was done to limit the results to papers within the construction industry, and the third level of screening limited the documents strictly to the publication period of 2000–2021.FindingsTwenty-four (24) barriers were identified in the literature, including lack of integrated design teams, which ranked the highest in appearance, high initial costs, poor market for IEQ buildings and higher design charges among others. The identified barriers were classified into six (6) categories namely capacity barriers, economic barriers, process-related barriers, cultural barriers, client-related barriers and steering barriers.Practical implicationsThe findings of this study would enable practitioners and policymakers to better understand what is preventing the widespread adoption of IEQ designs in the built environment and devise actionable strategies to overcome them. It adds to the body of knowledge on IEQ research by categorizing the various barriers that prevent the delivery of IEQ projects.Social implicationsThe developed barriers in this research can serve as a useful checklist to future researchers who may want to validate the barriers to IEQ designs in empirical studies and in different settings.Originality/valueThe interconnectivity revealed by the web-like framework allows for an appreciation of the various barriers of IEQ adoption which would help in expanding the current knowledge on IEQ beyond the narrow scope of isolated barriers. The fact that the papers selected in this study are not limited geographically, underscores the wide applicability of the findings in the global construction industry.
ABSTRACT
The role of density in the spread of the coronavirus pandemic is among the most critical concerns of urban designers and planners. To clarify this role, this systematic literature review is conducted on urban density and the COVID-19 infection and mortality rates in the context of urban design and planning. The studies were searched through three databases including Scopus, PubMed, and Web of Science in March 2022 and were screened and reviewed based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. In total, 58 of the 3344 studies had pre-defined criteria. The results were categorised into four sections: population density, building density, built environment factors, and sociodemographic factors. Finally, directions are provided for future studies due to research gaps.
ABSTRACT
PALAVRAS-CHAVE: COVID-19, Programas Universitarios para Adultos e Idosos, eLearning, aprendizagem continua The surprising announcement of an unknown pandemic caused by a coronavirus in the early 2020s confronted the world's education systems with a major challenge. The aim of this article is to highlight the relevance of virtual training in this type of context through the specific example of the University of Burgos and to highlight the much-needed role of the University in the development of lifelong learning for all citizens regardless of their age or place of residence. COVID-19, University Programmes for Older Adults, eLearning, lifelong learning 1INTRODUÇAO O desafio mais significativo enfrentado pelos sistemas educativos mundiais no século XXI foi desencadeado no inicio de 2020, quando uma nova pandemia, causada por um coronavirus, espalhou-se. Dito isto, ao nos concentrarmos na educaçao universitária dos adultos e idosos, nao podemos deixar de nos perguntar se as extraordinárias mudanças provocadas pela integraçao da aprendizagem virtual continuarlo no futuro.
ABSTRACT
The present research deals with the Risk assessment of groundwater quality. 79 groundwater samples were collected from domestic and agricultural usage open and bore wells during January 2021(COVID-19 Pandemic Period). Groundwater samples were tested to determine the physicochemical parameters using standard testing procedure for the preparation of spatial distribution maps of each parameter based on the World Health Organization (WHO) standard. Multivariate statistical analysis has shown the source of groundwater pollution from secondary leaching of chemical weathering of rocks. From the Water Quality Index and bivariate plot reveals that less than 20% of the area comes under high and very high-risk zone. The types of hardness diagram showed 32.91% of the samples fall in hard brackish water as illustrated by the Piper trilinear diagram. The research outcome result shows that the least percentage of industrials effluents due to the COVID-19 pandemic, not working for all industries during lock down period.
ABSTRACT
This paper's objective is to document the incorporation of video technology with associated personality assessments into an undergraduate civil engineering curriculum for giving presentations. In 2020, video assignments were implemented into a laboratory that teaches stabilized soil, aggregates, concrete, and asphalt principles. This same laboratory has, for several years, required students to present to a panel of practitioners on open-ended topics based in the area of their laboratory experiments. A large practitioner and alumni survey documented the successfulness of these panels, which allow no electronics to be used, but also documented some items that technology based presentation assignments could improve. This paper summarizes the panel exercises and associated survey findings, and thereafter, describes the implementation of video presentations with associated personality assessments. The research question was whether video presentation assignments were useful in conjunction with the proven in-person practitioner panels toward improved student presentation skills. The collective findings of this paper support this laboratory incorporating video presentations, especially given the diversity in personalities identified during data collection. © 2023 American Society of Civil Engineers (ASCE). All rights reserved.
ABSTRACT
In this study, an AR-based mobile learning application is proposed to assist online civil engineering course learning during the COVID-19 pandemic. A quasi-experiment has been conducted, and feedback from both the teacher and students has been analysed to examine the effectiveness of the proposed approach in terms of learning achievements. The subjects were 46 sophomores who majored in civil engineering in one class taught by one instructor in a southern U.S. state university. The quasi-experimental results showed that the proposed approach could not significantly improve the students' online learning achievements. However, the feedbacks brought some explanation to this non-significant result. They indicated that students found this mobile AR app to be an interesting, helpful, practical, and effective approach in their online learning that helped them gain more in-depth knowledge than traditional teacher-centred classroom instruction.
ABSTRACT
This study seeks to investigate whether project-based assignments can lead to better student performance and learning experience compared to traditional examinations. In an engineering course of soil mechanics, the traditional mid-semester and final exams were replaced by project work which was related to a real-life site investigation. Student performance was evaluated on the basis of student marks whilst student feedback was analysed to understand student experience with project-based assignments. The results indicated that the student average mark for the projects was greater than the average mark for the exams. In addition, their learning experience improved after the exams were replaced with the project-based assignments because students were able to see practical applications of the course content. However, a few issues, including feedback to students delivered at the end of the term, increased teacher's workload, and the effect of COVID were also identified.
ABSTRACT
Teaching geology under COVID-19 pandemic conditions led to teaching limitations for educators and learning difficulties for students. The lockdown obstructed face-to-face teaching, laboratory work, and fieldtrips. To minimize the impact of this situation, new distance learning teaching methods and tools were developed. The current study presents the results of an empirical study, where distance learning teaching tools were constructed and used to teach geology to university students. A mineralogical mobile phone application was used to replace laboratory mineral identification and a flow chart to replace laboratory rock identification. Additionally, exercises on faults and maps were developed to fill the gap that was created as field work was impossible. A university course on geology was designed on the basis of the constructed distance learning teaching tools, and more than 100 students from the Department of Civil Engineering attended the course. The results show that the proposed tools helped the students to considerably understand scientific information on geology and supported the learning outcomes. Thus, it is suggested that the teaching tools, constructed for the purposes of the study, could be used in conditions when distance learning is required, or even under typical learning conditions after laboratories, as well as before or after fieldtrips, for better learning outcomes.
ABSTRACT
The COVID-19 pandemic and associated prevention policies can directly or indirectly alter the sentiment of individuals while registering water pollution complaints, but observational evidence remains limited. Here, we conducted a sentiment analysis on over 10,000 water pollution complaints from residents in Alabama, USA (2012-2021) to better understand how and to what extent COVID-19 has altered emotion (polarity score-based) and attitude (subjectivity) of water pollution complaints. We found that the 2017 state-wise drought significantly increased the percentage of negative water pollution complaints by +35%, with no significant alternation in attitude before the COVID-19 pandemic. Since COVID-19, the percentage of negative and subjective water pollution complaints significantly decreased and increased by -30 and +20%, respectively, and these sentiment alternations were maintained by 2021. This study provides a new direction for environmental governance and management, requiring a timely response to changes in the public's emotions and attitudes during the next climate extremes and pandemics.
ABSTRACT
PurposeThe COVID-19 pandemic has brought profound changes to all sectors of society including the construction sector. The main purpose of this study is to explore and provide insights into the impact and changes that have occurred in the construction sector due to COVID-19 and to present a mitigation framework to minimize the effects.Design/methodology/approachThe scope of this study is limited to peer-reviewed articles in Scopus or Web of Science indexed journals. A systemized review was performed with bibliometric and content analyses of articles related to the impact of COVID-19 on the construction sector.FindingsThrough content analysis, the main topics discussed in the selected articles were grouped into 10 categories. Most of these studies were found to have focused on the challenges, impact, and health and safety at construction sites resulting from the pandemic. The study further identified 39 subtopics through detailed content analysis and organizes them into the categories of negative impacts, positive impacts and opportunities and barriers to COVID-19 safety guidelines in the construction sector. Moreover, the study developed a systematic mitigation strategy based on the recommendations of the literature review to reduce the impact of the current pandemic on the construction sector. The mitigation strategy presents separate set of measures regarding safety guidelines, process improvements, government intervention, psychological support and technology adoption.Originality/valueThe research insights provided in this study are useful for practitioners in guiding them to design effective strategies for addressing the challenges of the COVID-19 pandemic and future crises. Furthermore, a systematic presentation of the impacts, challenges and mitigation measures in this study will help researchers to identify existing gaps in the literature and explore other aspects of the impact of the pandemic on the construction sector.
ABSTRACT
This paper describes two studies that aimed to explore the impacts of pedestrianisation or road closures on traffic displacement, travel behaviour and the phenomenon of ‘disappearing traffic'. The first study surveyed residents whose travel routes were affected by a small-scale localised pedestrianisation scheme in the centre of a town. The second measured the traffic impacts of a temporary closure of a strategic bridge in a city centre. In the first case, the pedestrianisation produced no change in the modal shares of travel of residents. Drivers continued to drive to the same locations by longer routes. In the second case, the closure caused some traffic displacement and increased journey times but also reduced traffic volumes in both the immediate area and across the city. This paper concludes by discussing the remaining knowledge gaps on disappearing traffic, made more pressing by the decisions of authorities to reallocate road space during the coronavirus disease 2019 crisis.
ABSTRACT
Membrane materials might be used for face protection because they can decontaminate the inhaled air from particle pollution and viruses like the SARS-Cov0-2 which damages our respiration system. In this study, plyethersulfone membranes (PES) were synthesized with green solvent at room temperature and its filtration effectiveness was investigated against nano-bacteria (size 0.05 to 0.2 µm) by measuring their Bacterial Filtration Efficiency (BFE) and micro aerosol size (0.3 µm), and Particulate Filtration Efficiency (PFE). The average SARS-CoV-2 diameters are between 50 nm to 160 nm. A series of experiments were performed to accomplish between 0.03 to 0.21 µm PES sponge like diameters so that can be used for SARS-CoV-2 filtration. Results showed that nanofiltration/ultrafiltration could filter 99.9% of bacteria and aerosol from contaminated air the size of the Covid-19 molecule.
ABSTRACT
The Covid-19 pandemic has dramatically cut the amount people travel, with possible long-term effects on demand. Greg Marsden of the University of Leeds says civil engineers need to reconsider how they plan future transport infrastructure accordingly.
ABSTRACT
With the outbreak of the coronavirus (COVID-19) and the spread of this virus, the use of medical equipment, like 3-layerface masks, has increased dramatically. The proliferation of polymer-based face masks has become an environmental problem as ittakes years to completely decompose. The lack of proper management and collection causes environmental pollution. Therefore,considering the polymer base of the face masks and with the aim of improving the asphalt mixtures, in this article, the face mask andits different layers are added to the asphalt mixtures in 4 different weight percentages and in two different sizes, and Marshall test,Resilient modulus, Indirect tensile, Moisture damage, Rutting and Fatigue test were performed on the samples. The experimentalresults show that the addition of these materials to the asphalt mixtures improves the performance of asphalt and 12mm long fibersyielded better results than the results of 8mm long fibers.
ABSTRACT
Previous studies have shown that secondary school students may have misconceptions about geological scientific information. By the end of secondary education these misconceptions may remain unresolved. As a result, students enter university studies and still hold them. Students of engineering, as for example civil engineering, are no exception. The aim of this study was to investigate and analyse misconceptions of this specific target group. A closed questionnaire was designed and given to 102 University students who attended the 2nd semester course "Geology for Civil Engineers” in the Department of Civil Engineering at the University of Patras. The questionnaire was designed and validated according to previous research findings and implemented through google forms that were prepared and given electronically to the students to fill them online. The participants completed the questionnaire on the principles of geology electronically due to Covid-19 conditions. The results showed that in some questions most of the students answered correctly while in others there were many wrong answers, which revealed their misconceptions in geology. Many misconceptions were traced especially regarding mineral properties like color and luster. An important observation was that a notable number of students confused hardness with brittleness and as a result they expressed their belief that hard minerals are hard to break. Gender and age differences were tested using appropriate statistical tests. In cases that there was a significant difference between the genders, women were the ones with higher percentage of correct answers. The results may be seen in relation to educational practices. © 2022 International Multidisciplinary Scientific Geoconference. All rights reserved.