Based on radius vectors, a verified new GMM with directly included azimuth has developed. It has been fitted into a generated databank computed by use of an originally developed method-generator of data for regression analysis. Records of strong earthquakes that occurred in 1977, 1986 and both earthquakes that took place in 1990 in the Vrancea zone in Romania have been used.

The objective of this work was to analyse the importance of the feasibility of using a geolocation alert system. With the evolution of technology and its growing importance in people’s lives, existing vehicle tracking systems work with the aim of providing vehicle monitoring along a route. To meet the needs presented by the students, an electronic system was developed that will be installed on the bus, which will have the ability to send its geographical coordinates, based on a GPS system, to the GÊNESIS App and store them, thus enabling enrolled students and staff at Kimpa Vita University to locate a particular bus. The system presented in this research is designed to be a simple and easy-to-use tool, with a sufficient degree of precision to ensure that the results meet the specifications of the requirements.

The aim of this study was to extract avocado oils using the laboratory method (Soxhlet) and the artisanal method. To achieve the research objective, an artisanal oven was used to dry the avocado pulp and a device was adapted for artisanal oil extraction. The oils obtained by hand were compared to those extracted in the laboratory on the basis of organoleptic, physical and chemical analyses. The following parameters were assessed: colour, density (d), saponification index (IS), iodine index (II), acidity index (IA), ether index (IE), peroxide index (IP) and unsaponifiable matter. Volumetric methods were used for the quantitative determination of these indices. The oil analyses were carried out in duplicate and the following results were obtained: The oils extracted in the laboratory and by hand showed a dark green colour. With regard to the physical and chemical parameters, the following averages were obtained: density - laboratory oil (OL): 0.912 g/cm3; artisanal oil (OA): 0.911 g/cm3; -acidity index OL: 5.609 mg KOH/g; OA: 4.515 mg KOH/g; -iodine index OL: 88.706 g I2/g; OA: 82.357 g I2/g; -saponification index OL: 190.68 mg KOH/g; OA: 189.14 mg KOH/g; -ester index OL: 185.071 mg KOH/g; OA: 184.62 mg KOH/g; -peroxide index OL: 10.12 mEqO2/kg; OA: 9.89 mEqO2/kg; -unsaponifiable matter content OL: 1.506%; OA: 1.5204%.

In the tropical acidic soils of Gagnoa, Côte d’Ivoire, rice cultivation is hindered by phosphorus immobilization due to iron and aluminum oxides. Phosphate amendments, such as phosphate rock (RP) and triple superphosphate (TSP), are used to improve phosphorus availability but can remobilize iron, particularly in temporarily flooded lowland rice fields. This study evaluates the effect of eight phosphate amendment formulations on iron dynamics in acidic rice soils. Tested on five plots over three crop cycles, the formulations showed a significant reduction in leaf yellowing symptoms and brown spots, with a decrease of 50% in yellowed leaves and 43 to 67.6% in brown spots compared to unamended plots. Additionally, grain and straw yields increased due to reduced infertile tillers and panicle sterility. Regarding iron dynamics, the amendments reduced soluble, exchangeable, acid-soluble, and bioavailable iron fractions, leading to better yields and reduced iron toxicity. TSP, with its rapid solubility, proved effective in the short term, but its effects diminished over time. In contrast, RP, with its slow phosphorus release, maintained stable yields and reduced toxicity symptoms. These results highlight the importance of choosing the appropriate phosphorus form based on soil conditions to optimize long-term rice productivity.

This research explores the psychological factors influencing students’ motivation in mathematics at General Education Colleges (CEG) in Bembérèké, Benin. The main objective is to identify the psychological dynamics that affect student engagement in this subject. A qualitative approach was adopted, involving 170 students and 33 teachers. Data were collected using questionnaires and analyzed through a combination of thematic and statistical analyses. The results show that the majority of students perceive themselves as having average or below-average competence in mathematics, which negatively impacts their motivation. Additionally, a high level of math anxiety was observed, constituting a major obstacle to learning. Despite moderate to high interest in mathematics, students’ intrinsic motivation remains low, limiting their long-term engagement. The findings suggest the need to rethink pedagogical strategies to better meet students’ needs by integrating psychological support programs and more interactive teaching methods. This research makes a significant contribution to understanding students’ motivation in mathematics in underrepresented educational contexts and proposes ways to improve student engagement and academic performance.

The double feed asynchronous machines are increasingly used in modern wind farms to optimize wind turbine performance. These machines have the ability to adapt to variations in wind speed and also contribute to the stability of the electricity network. In this article, the modeling and simulation of the double feed asynchronous machine has been done. The different machine parameters such as speed, torque, flows and currents were analyzed. The results showed that all the quantities of the machine have an oscillating transient regime. Thus, the very unstable open-loop nature of the double feed asynchronous machine appears very clearly. In order to resolve this problem, the use of looped commands becomes essential.

In recent decades, the use of new field technologies used in the mining world and very little used in academia has become very important in several research disciplines. The recent development of portable field measuring instruments makes it possible to acquire a large amount of data without the need for costly sampling and analysis campaigns. As part of the «Geochemistry Geophysics Technology in Mining Exploration (T2GEM)» project, the acquisition of a portable X-ray fluorescence at the Petrology-Metallogeny laboratory at the STRM UFR of the Félix Houphouët-Boigny University (Côte d’Ivoire) has made it possible to promote the use of these new technologies as part of a scientific project whose research focus is the distribution of rare metals in columbian-tantaliferous placers in the Issia region. This study is therefore based on the contribution of x-ray fluorescence in the characterization of Nb-Ta placers in the Issia region by the analysis of rare metals in the surrounding formations. This technology provides real-time decision support for operational decisions in the field (exploration, mining), offers a cost-effective alternative to conventional laboratory analysis programs, and effectively addresses remote or difficult field conditions. The ability to rapidly collect large numbers of samples and replicate analyses facilitates the acquisition of higher data density.

Several factors threaten the integrity of aquatic ecosystem resources in the Democratic Republic of Congo. The banks of the Pool Malebo (Congo River) are also vulnerable to the presence of plastic pollution in its waters. This study aims to inventory the different types of microplastics in three compartments (water, sediment and fish) of the Congo River in the part of the Pool Malebo between the fishing stations of Maluku and Kinsuka in Kinshasa. The search for microplastics was carried out by trapping with the Manta net. The identification and classification of plastic debris recorded in the three compartments of the Congo River were done on the basis of the density of microplastics. The results obtained showed that the physical and chemical parameters of the waters of the Congo River in the Pool Malebo generally contribute to the disintegration of macroplastics into microplastics. All the digestive tracts of the sampled fish have microplastics and the consequences on the food chain are obvious especially tourists and other populations consuming these fish. From the point of view of relative abundance of waste, PELD with 35 debris or 79.5% are the most numerous than PP with 9 debris or 20.4%. Given the danger that microplastics represent for aquatic animals and human health, further research based on the characterization of plastic waste by more advanced techniques will provide additional information on the composition of microplastics present in the Malebo Pool.