Search

This study is devoted to psychosocial risks in the university environment. Exposure to psychosocial risks is detailed using existing job and professional nomenclatures. Prevention approaches are all the more effective if they are adapted to the field in which they are deployed. After reviewing each dimension, an analysis of overall exposure to PSRs is carried out. The objective of our study is to contribute to the evaluation of psychosocial risks of university administration personnel, by proposing solutions and recommendations. As a case study, we have taken the Faculty of Science and Technology of the University of Constantine1, Algeria. This study is based on the KARASEK model, composed of 26 questions, and then completed with 6 questions of the SIEGRIST model. As a result of the study, most of the employees suffer from work stress and psychological stress. Therefore, the management should implement preventive actions that meet the expectations of the employees to encourage, appreciate and support them at work.

This paper presents an overview of the tram safety in the city of Constantine. The objective of this work is to contribute to the improvement of railway safety of a new urban transport mode in Algeria, whose safety culture is absent in the behaviour of citizens, in the face of major risks linked to the operating of Constantine’s tram. In this context this article focuses on four parts: safety and risk management, railway risks, analysis of accidents, safety system and human factors (tram driver). This paper discusses the main issues, challenges and future directions of public transportation safety on these themes.

Storage tanks are vital to the oil industry, functioning as essential components in the operation of oil fields. However, their strategic importance is accompanied by significant environmental risks, particularly due to atmospheric dispersion events. These events, characterized by the release and spread of pollutants such as aerosols, gases, and dust into the atmosphere, can stem from both human activities and accidental releases. The consequences are often severe, leading to considerable human, material, and ecological damage. Atmospheric dispersion of pollutants has emerged as a major environmental concern, especially within industries where storage tanks are integral to operations. This concern is magnified by increasingly stringent regulatory frameworks. Industries, particularly those operating within classified facilities subject to environmental protection laws, are now mandated to thoroughly identify, analyze, and assess potential accidental risks associated with their operations. These regulations are designed to mitigate the adverse impacts of such incidents, and this forms the object of this study. In this study, we concentrated on the T-403A/B/C storage spheres at the ALRAR gas complex. Utilizing dynamic consequence modelling with ALOHA software, it was possible to conduct a comprehensive assessment of potential pollutant releases in the processing area. This approach allowed to meticulously map out the hazardous phenomena linked to these scenarios and to develop targeted preventive and protective measures. The findings from this study highlight the critical need for rigorous risk assessments and the implementation of proactive safety strategies. By doing so, the environmental and operational risks associated with storage tanks in the oil industry can be significantly reduced. This research underscores the imperative of integrating advanced modelling techniques and stringent safety protocols to safeguard both the environment and industry operations. [ABSTRACT FROM AUTHOR]

The beneficiation of mineral resources not only bolsters a country’s economy but also improves quality of life and fosters sustainable growth. The development of the phosphate mine in the Bled El Hadba region represents a pivotal move to meet increasing demand. This study aims to develop a comprehensive 3D geographic model of the deposit, estimate its phosphate reserves, and assess the parameters and characteristics for effective exploitation. Utilizing the block model method in Surpac 6.6.2, a detailed analysis is achieved that supports informed decision-making for sustainable resource management. This approach underscores the importance of technological innovation in the strategic planning and efficient utilization of mineral resources. The results revealed total reserves of 425,304,000 m³, equivalent to 893,138,400 tons, with an average grade of 21.65 %. The stripping ratio was determined to be 3.3:1. These findings provide valuable insights into the deposit’s potential and the optimal depth range for extracting the highest concentration of P2O5. For detailed extraction planning and estimating P2O5 concentration over five-year periods from 2023 to 2066, with an average annual phosphate ore production of 20.7 million tons, Minesched software was utilized. This comprehensive approach ensures efficient resource management and maximizes the economic return from the deposit. These findings have profound implications for enhancing both the efficiency and sustainability of Algeria’s mining industry. By securing a consistent supply of phosphate products, particularly for agriculture, this research addresses the rising demand for phosphates. Additionally, the data can inform strategic planning, enabling optimized resource extraction and reduced environmental impact. This contributes not only to the immediate needs of the industry but also to the long-term economic and ecological sustainability of the region. Ultimately, the study supports sustainable development by balancing industrial growth with environmental stewardship, ensuring that future generations can continue to benefit from these vital resources. [ABSTRACT FROM AUTHOR]

The object of research is medical waste management. Healthcare activities protect health, cure patients and save lives. However, they generate waste that is harmful to public health and the environment. As a result, the management of this healthcare waste is becoming increasingly important in the field of public health and the environment. One of the most problematic places is, poor management of these issues that can put healthcare workers, medical waste workers, patients and their families, and the entire population at risk. On the other hand, poor treatment or inadequate disposal of this waste can also cause risks. From now on, the rational elimination of this pollution is one of the essential conditions for respecting hygiene rules, not only inside establishments, but also in the general environment. In this unfavorable context, we are trying through this contribution to achieve adequate management using reverse logistics practices with the main objective of resolving healthcare waste management problems while taking into account the reality of things in situ. For this purpose, an approach guided by data, carried out directly in the field, by direct contact with the different categories of health personnel interviewed, through findings, observations, audits, questionnaire and knowledge of the causes was used. This approach is based on the audit of compliance with the supply chain in the management of hospital waste in the different departments of the Constantine University Hospital (Algeria). As a result of the research it is shown that the situation is very poor given that the logistics chain is completely faulty or no step is respected. Thus, the least respected stage is storage, where no service exceeds 25 %, this is due to the fact that no clinic has an intermediate waste storage area. And the most respected is treatment stage that does not exceed 75 %. This allowed to detect the inadequacies recorded at the level of the study establishment, and even improvements are suggested for sustainable management of healthcare waste at the level of Algerian health establishments. [ABSTRACT FROM AUTHOR]

The object of the study is the logistics of goods delivery by ports. This study presents a methodology designed to improve the efficiency of goods delivery logistics at the Bejaia port (Algeria). It prioritizes the optimization of empty container allocation to the ZEP zone, taking into account the geographical accessibility of the Tixter area, aiming to reduce the high costs linked with goods transportation. At the core of this strategy lies the use of simulation techniques to optimize truck fleets, ensuring maximum utilization rates and effective management of delivery operations by the Bejaia Mediterranean Terminal (BMT) for its clients. Addressing this challenge, the study offers an exhaustive analysis, integrating truck assignment models and accessibility assessments of logistic zones. The results highlight the paramount significance of optimal resource allocation and synchronized client coordination for achieving streamlined goods delivery. It becomes apparent that employing these methodologies can yield substantial productivity improvements, emphasizing their pivotal role in strengthening the port’s logistical infrastructure. Via rigorous analysis and insights derived from data, this study elucidates avenues towards achieving operational excellence within the logistical infrastructure of the port. By harnessing innovative strategies to confront persistent challenges, such as optimizing truck fleets and strategically allocating resources, the research anticipates a profound transformation in the efficiency and cost-effectiveness of goods delivery operations. Ultimately, the integration of these methodologies holds the potential to propel the port of Bejaia towards enduring success and a competitive edge in the ever-evolving landscape of global trade. Through extensive efforts, this strategy can be extended to other national and international ports operating under similar conditions, as it provides valuable information and methodologies to optimize logistics and transportation operations. [ABSTRACT FROM AUTHOR]

The object of this research is the phosphate serves, as a fundamental and crucial raw material with diverse applications, primarily utilized in producing phosphoric acid and fertilizers. However, dolomitic impurities within the ore can greatly impede its effectiveness. Therefore, it is essential to minimize these impurities to the lowest feasible levels to mitigate their adverse effects. This ensures optimal performance and quality in various industries reliant on phosphate, promoting efficiency and sustainability in the production process. Through a comprehensive assessment, it becomes feasible to gauge the enrichment potential and propose viable methods to realize it. Among these methods, flotation stands out as one of the most effective for enhancing phosphate ore, despite its inherent drawbacks of costliness and environmental impact stemming from chemical reagents. This study endeavors to investigate the feasibility of employing electrostatic separation as an alternative method for enriching phosphate ore sourced from the Tebessa region in Algeria. Such exploration aims to offer insights into potentially more sustainable and economically viable approaches to ore enrichment in the region of Bir Elater Wilaya of Tebessa. Tests were carried out using different types of electrostatic separators at the Angouleme site of the PPRIME Institute: a multifunctional metal-belt-type separator, a free-fall plate-electrodes-type separator and an electrostatic separator with coaxial wire–cylinder electrode system. The experimental findings demonstrate significant promise, indicating that electrostatic separation enhanced the P2O5 content from 25% to 29% in an untreated phosphate ore sample. Simultaneously, it efficiently eliminated 82.80% of MgO, achieving a P2O5 recovery rate more than 80% and a yield of 70%. Consequently, employing this method proves effective in reducing the MgO content of the ore to below than 1%, aligning with industrial standards for commercial phosphate products. This underscores the viability of electrostatic separation as a viable and efficient technique in phosphate ore processing, offering substantial improvements in both quality and yield. [ABSTRACT FROM AUTHOR]

The object of the research is the most important factors causing road accidents. This paper aimed to study the effects of this factors and their interactions on the stopping distance function. Understanding this function through simulation and comparing the results with mathematical models and experimental tests will help to reduce the number of road accidents. A large part of road accidents is linked to non-compliance with regulatory speed associated with vehicle braking system (grip, road and tires) and weather conditions. A speed measurement campaign on peri-urban roads was carried out to study driving behavior and compliance with speed limits in several Algerian cities. An experimental modelling of speed, anti-lock system, weather, grip and their interaction effects on the stopping distance of a vehicle using the experimental design method, combined with driving simulator tests was been conducted. The developments of experimental design with speed variation ranges (70 and 130 km/h) were necessary to study the influence of the various driving parameters on stopping distance. The mathematical model developed has been validated by the results obtained on the simulator. The experimental design method and simulator results were used to identify and define the important parameters that influence the braking distance. The results show that the stopping distance (SD) is mainly influenced by the vehicle speed (S), the weather conditions (M), and their interaction. The increase due to speed leads to an increase in the stopping distance with an estimated effect of 54.30 m. When the speed varies between its lower experimental level (70 km/h) and its higher level (130 km/h), it is estimated that the stopping distance will increase by 54.30 m. The analysis of the road speed measurement campaign, 55 % of road users do not obey the speed limits. The results obtained in this study can be applied to other countries, only the parameters need to be adjusted. [ABSTRACT FROM AUTHOR]

ETRAG is a tractor manufacturing company that has been the pride of the Algerian agricultural equipment industry for decades. However, despite the advantages that distinguish them from other industries, the length and complexity of the supply chain make it vulnerable to a variety of unexpected risks that can directly affect supply chain activities. Therefore, it is essential to explore the key r isks and formulate risk mitigation actions, which are the objectives of our research. On the basis of extensive bibliographic research, the House of Risk (HOR) model, through a SCOR-based approach, was selected as a working tool in this study in order to identify the priority of risk agents and risk preventive action. The study results showed there were 13 business activities, 29 risk events, and 30 risk agents. Based on the Aggregate risk potential (ARP) value, 16 risk agents are classified as priority risks in HOR1. In HOR2, 17 preventive actions are proposed for priority risk agents to be implemented in the company in descending order based on the effectiveness to difficulty (ETD) value. There are five strategies to implement the 17 mitigation actions: operations planning, supplier relationship management, multiple sourcing, demand management, and skill and efficiency development. [ABSTRACT FROM AUTHOR]