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construction time 1

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individual’ shypoxia- resistant ability 1

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Key uncertainty events impacting on the completion time of highway construction projects

Alireza MOGHAYEDI, Abimbola WINDAPO

Frontiers of Engineering Management 2019, Volume 6, Issue 2, Pages 275-298 doi: 10.1007/s42524-019-0022-7

Abstract: This paper examines the uncertainty events encountered in the process of constructing highways, and evaluates their impact on construction time, on highway projects in South Africa. The rationale for this examination stems from the view held by scholars that the construction of highways is a complex process, taking place in changing environments and often beset by uncertainties; and that there is a lack of appropriate evaluation of these uncertainty events occurring during the construction process. The research made use of a review of extant literature in the area of uncertainty management, and modeling in infrastructure projects, to guide the direction of the study. The inquiry process consisted of brainstorming by highway experts and interviewing them to identify the uncertainty factors that impact construction time. An uncertainty matrix for South African highway projects was developed, using a quantitative model and descriptive statistics. It emerged from the study that the uncertainty events affecting the construction time of highway projects are distributed across economic, environmental, financial, legal, political, social and technical factors. Also, it was found that each factor might account for several uncertainty events which impact on construction time differently, through a combination of the uncertainty events of the individual construction activities. Based on the obtained data, an Adaptive Neuro Fuzzy Inference System (ANFIS) has been developed, as a simple, reliable and accurate advanced machine learning technique to assess the impact of uncertainty events on the completion time of highway construction projects. To validate the ANFIS model, the Stepwise Regression (SR) models have been designed and their results are compared with the results of the ANFIS. Based on the predicted impact size of uncertainty events on the time of highway projects, it can be concluded that construction time on South African highway projects is significantly related to the social and technical uncertainties factors.

Keywords： ANFIS construction time impact assessment highway project South Africa uncertainty

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Recent advances in electrochemical decontamination of perfluorinated compounds from water: a review

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 2, doi: 10.1007/s11783-023-1618-z

Abstract:

● Recent advances in the electrochemical decontamination of PFAS are reviewed.

Keywords： Perfluorinated compounds Electrochemical approach Working mechanisms Impacting factor Coupled process

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Numerical studies of dynamic behavior of liquid film on single-layer wire mesh with different wettabilities

Frontiers of Chemical Science and Engineering Pages 1672-1680 doi: 10.1007/s11705-022-2205-8

Abstract: Droplet impacting on the stainless steel wire mesh is very common in chemical devices, like a rotating

Keywords： stainless steel wire mesh computational fluid dynamics surface wettability liquid film impacting

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Analysis of factors affecting passengers ’ mountain sickness basedon nonparamertric tests

Chang Haijuan,Liu Meng,Pang Liping,Yang Peng,Wang Jun

Strategic Study of CAE 2009, Volume 11, Issue 2, Pages 65-69

Abstract:

2 882 samples were taken in Qinghai- Tibet railway cars, and 1 693 samples were taken out randomly, then the factors that may affect the ability of individual' s hypoxia- resistant were analyzed in statistics. This paper has done this work by nonparametric statistics and correlation analysis , and got the conclusion that five factors, which are mountain sickness one have suffered before, sex, smoking frequency, bodily form and age, influence individual' s hypoxia- resistant ability. The conclusion makes a good sense, as it can provide statistics foundation for continuous iatrical research, while giving directive suggestion to reduce passengers' mountain sickness, and providing warranty for the design and amelioration of oxygen supplying system in Qinghai- Tibet railway cars .

Keywords： mountain sickness impacting factors Qinghai- Tibet railway nonparametric tests individual’ shypoxia