Tailing impoundments are sources of high-risk pollution due to the accumulation of mining tailings and wastewater. As a result of thin karst overburden as well as actions of precipitation leaching ...and scouring, pollutants in the tailing impoundment can easily enter the karst aquifer through sinkholes, corrosion fissures and other channels, causing pollution to groundwater and is not conducive to the utilization of groundwater resources. Through the analysis of hydrogeological conditions, the boundary condition, aquifer structure, source-sink term, and hydraulic characteristics of groundwater are generalized, the groundwater flow model and solute migration model were established, and the migration mechanism of the characteristic pollutant (arsenic ions) was analyzed. The research results show that with the passage of time, the area of high-concentration polluted areas showed a decreasing trend, and the area of low-concentration polluted areas showed a decreasing trend; Under the influence of groundwater flow and the pollutant concentration difference, the pollution plume presents an elliptical shape with the long axis along the direction of water flow; The migration law of pollutants is controlled by the direction of groundwater flow, the concentration difference of pollutants and the permeability of the aqueous medium; The direction of groundwater flow determines the migration direction of pollutants, the concentration difference of pollutants determines the diffusion range of pollutants, and the permeability of aqueous media determines the migration speed of pollutants; Through the prediction of the pollutant control effect, it can be found that a reasonable number of pumping wells that do not interfere with each other are arranged around the groundwater flow channel, which can effectively control the migration of pollutants to the target area. The above research reveals the migration mechanism of pollutants in karst groundwater and main control factors, and also provides a scientific basis for the protection of groundwater resources in karst areas.
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•The migration law of pollutants in groundwater in karst areas is proposed.•The controlling factors of pollutant migration in karst groundwater are summarized.•Discusses the feasibility of pumping wells to control the spread of pollutants.
With the development of the Internet, Internet finance in new P2P modes will face a great many difficulties and opportunities; so, relevant risk early-warning models need to be researched and ...analyzed. The early-warning analysis will not only be helpful for P2P, the new mode, but will also be worth learning by the whole Internet financial industries, and there will be a particular demonstration effect. Deep researches have been made on Internet financial risk precautions mainly through analyzing and researching the risks in the leading P2P online debit and credit model within the scope of Internet finance; therefore, risk factors that influence the development of Internet finance are obtained. Next weighting KNN Internet financial risk management and control algorithm with the variable precision rough set is out forward. Training sets of different categories are divided into positive regions and boundary regions through the upper and lower approximation concept of variable precision rough set, thereby acquiring the affiliation regions of the samples based on the similarity between test samples and the sample center. In this way, the category of samples belonging to the positive region can be directly judged, and that of other regions can be judged through the KNN algorithm based on quantitative weighting. Experimental results have verified the effectiveness of the mentioned algorithm.
Power Generation Forecast of Hybrid PV-Wind System Sanjari, Mohammad Javad; Gooi, Hoay Beng; Nair, Nirmal-Kumar C.
IEEE transactions on sustainable energy,
04/2020, Volume:
11, Issue:
2
Journal Article
Peer reviewed
Open access
Due to their intermittency and unpredictability, increasing the penetration level of renewable energy (RE) resources to the power system leads to difficulties in operation. Reliable system operation ...requires a precise forecast of generated power by RE units. Photovoltaic (PV) and wind units are the significant portion of RE resources integrated into the power system. This paper proposes a forecast method for PV and wind generated power to achieve good prediction accuracy in different weather conditions. Not only is the relation between the wind and PV output power modeled, but the heat index (HI) is also taken into consideration as a useful meteorological variable to achieve the 15-min ahead precise expectation of PV/wind output power. Moreover, the input data are discretized in such a way that the best accuracy for the PV and wind power forecast is achieved. Comparing the results of the proposed method with the historical data recorded at actual PV and wind plants shows that the proposed forecast method results in high accuracy in PV and wind output power forecast. Moreover, the forecast model performance with HI consideration is compared with the model not using HI as an input variable.
Advancements in complexity, complex systems, and the intelligence sciences, particularly smart city technologies, have shown great potential in aiding to ease traffic congestion. The overall approach ...and the main ideas in building smart transportation for smart cities, particularly ACP (artificial system, computational experiment, and parallel execution)-based parallel transportation management and control systems (PTMS), are presented. PTMS can be expanded to the new generation of intelligent transportation systems. The main components of the proposed architecture include social signal and social traffic, ITS clouds and services, agent-based traffic control, and transportation knowledge automation. Some technical details of these components are discussed. Finally, one case study is introduced, and the effectiveness is analyzed.
Management and Modeling of a Hybrid Electric Vehicle Ksentini, Abdelhamid; Hadef, Zakaria; Azzag, El-Bahi
The scientific bulletin of Electrical Engineering Faculty,
12/2022, Volume:
22, Issue:
2
Journal Article
Peer reviewed
Open access
The use of solar electric vehicles (SEV) has recently been the subject of frantic communication by many researchers in this sector such as researcher (GASBAOUI Brahim and F. Burling). In this ...research, we focused on adopting other renewable energy sources, such as wind energy, to convert this energy into kinetic energy for the vehicle (EVWTG electric vehicle). The main aim of this research is to adopt the principle of a wind turbine generator in order to power an electric vehicle (EV), which relies on energy of the air currents on the surface of the vehicle and converts them into electrical energy to feed the electric motor simultaneously or storage by batteries. This system has several draw backs such as continuous energy production and controlling the speed of the wind turbine. For this, we developed a technique to ensure the production of electrical energy and its management according to the proposed system energy management technology. The operation model of the proposed EVWTG system was simulated using MATLAB, where the results obtained proved the effectiveness of the proposed control and energy management, which can be used in other practical studies in the future.
The social and environmental impacts of the petroleum industry have serious consequences and call for sustainable solutions and practices. Embedding sustainability into organisations is vital to ...address these issues, and requires the integration of sustainability into performance management systems. The aim of this paper is to investigate the barriers to, and enablers of, sustainability integration in the performance management systems of an oil and gas company. A qualitative case study has been used to identify the stages and means of integration in the organisation, based on Gond et al.'s (2012) framework depicting the role of control systems in supporting sustainability integration within strategy. The findings revealed that although cognitive, organisational and technical enablers moved integration of sustainability forward in the organisation, certain cognitive barriers considerably affected the attainment of full integration. Institutional pressures provided the impetus for the development of enablers, giving rise to several implications for governments, academics and other parties. The study shows that sustainability integration in performance management systems could lead to better management and control of sustainability performance in organisations. This study provides a more comprehensive approach towards understanding the integration of sustainability in control systems from a socio-technical perspective.
•Comprehensive review of mixed-mode buildings studies since 2010.•Assessment of weather-dependent potential for cooling demand reduction.•Analysis of key factors such as simulations inputs, comfort ...standards and schedules.•Analysis of the control methods used for managing mixed mode buildings.
Ventilative cooling technologies have the potential to be an effective measure to reduce buildings energy consumption, by meeting some or all of the cooling requirement of a building without the need for mechanical cooling. Mixed-Mode (MM) buildings utilise both natural and mechanical cooling systems to meet their thermal energy demand. These buildings are able to guarantee that thermal comfort conditions are maintained, whilst exploiting the cooling potential provided by the climate. Effective management of the cooling systems in MM buildings is important to ensure that comfort is maintained and free cooling is exploited when available. While the implementation of hybrid ventilation systems is becoming more common, the current industrial and academic research state-of-the-art provide different and sometimes contrasting approaches to the management and evaluation of MM buildings. The current review provides an overview of studies into MM buildings performed in the last 10 years, analyzing in detail key factors that determine the potential of a building to save energy, including simulations inputs assumption, comfort standard used for evaluation, building and Heating, Ventilation and Air Conditioning (HVAC) systems typologies and control strategy employed. A detailed analysis of the papers which had a focus on methods for control of hybrid ventilation system was undertaken. This highlighted the importance of coordination between systems to ensure operational effectiveness and showing that while the majority of the studies employed classical control techniques, predictive control methods were the most investigated approaches to fully exploit the potential efficiency of MM buildings.
Self-sustainability and intelligence will be critical features of the next generation of Internet of Things devices. Power management circuits need to be energy-efficient in multiple power modes, ...from nW sleep to mW active, and to support energy harvesting (EH) from multiple environmental sources. This article presents an adaptive and firmware-configurable power supply unit that enables intelligent devices to operate in the sub μW range while achieving self-sustainability through EH. The microcontroller-based design allows efficient conversion from batteries, dc, ac environmental sources, and nA quiescent currents. Source and load power points are decoupled with multiple dc-dc converters aiming to supply loads with adaptive voltage scaling and achieving high reliability. Experimental results show the flexibility and efficiency of this approach: the proposed power supply unit achieves a quiescent current of 54 nA and a maximum peak load current of 300 mA, delivered with an end-to-end power efficiency above 85%.
Abstract
With the rapid development of urban construction, smart city has become an important trend in the future, which is inseparable from the intellectualization of drainage pipe network. At the ...same time, with the increasing frequency of urban flood disasters, the old drainage pipe network system will cause significant economic losses, which requires modern cities to establish intelligent management and control of drainage pipe network. However, the situation of drainage facilities in most cities in China is complex, which requires strengthening modern means such as monitoring, operation management and planning services. Therefore, the research on intelligent management and control system of drainage pipe network based on big data technology is of great significance. Firstly, this paper analyzes the importance of intelligent management and control system. Then, this paper puts forward the main algorithms for big data processing. Finally, this paper constructs the intelligent management and control system of drainage pipe network.
The rapid pace of urbanization has increased the development and land reuse value of China’s closed industrial solid waste landfill (CISWL) sites. In-situ development of land without waste excavation ...has both economic and environmental benefits. Therefore, the present study systematically evaluates the on-site risks of a CISWL site under in-situ development conditions by sampling analysis and process model simulation to predict its long-term evolution. The results demonstrated that 93% of the waste leaching concentration was harmful and 66% of the waste was not suitable for soil directly used for urbanized land after nearly 20 years of leaching and degradation. The groundwater quality had changed from “no possibility of exceeding the standard (short term)” to “only a few harmful substances (Pb) have a very small possibility of exceeding the standard (medium term),” to “both Pb and total cyanide (T-CN) have a high probability of exceeding the standard (later stage).” At the same time, the health risks of the site use process have gradually increased over time. The carcinogenic risk posed by As and the non-carcinogenic risk from T-CN exceeded the acceptable level by 139–267 times and 4.9–17.2 times, respectively. The above results suggest that risk assessment and management strategies of CISWL site development and reuse should focus on long-term risks. For sites with unacceptable long-term risks, acceptable long-term risks can be lowered appropriately by reducing the concentration of toxic substances in leached waste. The present study proposes a calculation framework and method for the corresponding leaching concentration limits.
•Harmful pollutants degrade slowly in closed landfill environment.•Long-term health risks exceed 4.9–267 times the acceptable level for this site.•Long-term risks should be considered when reusing industrial solid waste sites.
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