Publications Scientifiques

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Start date: 2020

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Now showing 1 - 10 of 2215
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    Mycotoxins in preharvest, postharvest, and stored wheat grains collected from two climatic regions in Algeria
    (Taylor & francis, 2025) Khouni, Hayat; Ben Salah-Abbès, Jalila; Badji, Tiziri; Al-Amiery, Ahmed; Durand, Noel; Zinedine, Abdellah; Abbès, Samir; Riba, Amar
    Multi-mycotoxin analysis of 22 mycotoxins in 202 durum wheat samples collected in Algeria from 2019 to 2021 was performed by UHPLCMS/MS. Enniatins were present in 2 out of 45 wheat samples in the 2019 harvest, whereas in the harvest of 2020 37.6% of wheat samples were contaminated by ochratoxin A and/or beauvericin, deoxynivalenol (1076 µg/kg), fumonisin B1, enniatins, and zearalenone (most prevalent in 2020 and 2021 harvest). Mycotoxin contamination increased from 37.6% in 2020 to 55.2% in 2021 harvests. The most frequently observed mycotoxin co-occurrence was the combination of enniatin A1, enniatin B, and enniatin B1 (0.5-126 µg/kg) and DON (1307 µg/kg). AFB1 (0.4-2.6 µg/kg) was found in only one sample collected from the continental region. These results pointed to the necessity of frequent and regular wheat quality controls in order to better evaluate the risk regarding the Algerian population.
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    Stabilization of the wave equation with internal damping and numerical simulations
    (Taylor & francis, 2025) Barry, Kalifa Lassana; Laoubi, Karima
    In this article, we investigate the exponential stabilisation problem of a wave equation incorporating Wentzell static boundary conditions. Using the Lumer-Philips theorem, we confirm the existence of a solution. We derive an acceptable exponential decay rate by following Nakao’s criterion. Additionally, we conduct one-dimensional numerical experiments to verify the preservation of the energetic properties of the wave equation under interior viscoelastic damping.
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    Integration of a Natural Biopesticide into Grain Storage Systems: Insecticidal Toxicity and Antifungal Activity of Mentha Pulegium Essential Oil
    (ELSEVIER, 2025) Aous, Wahiba; Sadaoui, Samia; Cherif, Yahia; Boughelit, Nadia; Neffah, Fadila; Abdellaoui, Karima; Hacib, Hinda; Hadjadj, Naima; Hazzit, Mohamed
    Post-harvest losses of stored cereals are largely due to insects and phytopathogenic fungi, particularly in developing countries where storage conditions remain precarious. In the context of reducing the use of synthetic insecticides, essential oils are a promising alternative. This study evaluates (i) the insecticidal activity of Mentha pulegium L. (pennyroyal) essential oil against two major pests of stored commodities, Sitophilus oryzae L. and Tribolium castaneum Herbst, by inhalation and ingestion, and (ii) its in vitro antifungal activity against three phytopathogenic fungi, Rhizoctonia spp., Fusarium spp. and Alternaria spp. The essential oil was extracted by hydrodistillation using a Clevenger apparatus and then characterised by GC-MS. Insecticidal bioassays were performed on adults fed or exposed to different doses of the essential oil; mortalities were corrected using the Abbott formula and the LC₅₀/LD₅₀ estimated by probit analysis. Antifungal activity was studied by direct comparison on PDA medium supplemented with 0.25 and 0.5% (v/v) essential oil.The essential oil of M. pulegium is dominated by pulegone (≈ 60%) and menthone (≈ 7.5%). When inhaled, it induces up to 100% mortality in both insect species at high doses, with a lower LC₅₀ in S. oryzae (54.20 µL/L of air) than in T. castaneum (93.31 µL/L). When ingested, the LD₅₀ is lower in T. castaneum (46.01 µL/mg of grain) than in S. oryzae (66.02 µL/mg). In vitro, M. pulegium strongly inhibits the mycelial growth of Rhizoctonia spp. (≈ 90%), Alternaria spp. (≈ 85%) and, to a lesser extent, Fusarium spp. (54–66%).These results confirm the potential of M. pulegium as a natural biopesticide with dual insecticidal and antifungal action for the protection of stored commodities.
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    Monotone Theory for Hadamard Fractional Boundary Value Problems
    (2025) Boucenna, Amina; Nouikas, Azeddine; Souad, Ayadi; Meltem, Erden Ege; Ozgur, Ege
    In this paper, we study the existence and uniqueness of a weak solution for a fractional differential problem involving the Hadamard fractional derivative, defined on a bounded interval. The initial conditions are assumed to be homogeneous, and the right-hand side is continuous. The analysis is carried out within an appropriate functional framework, and the main results are established by applying the Minty–Browder theorem, which serves as an effective tool for proving the solvability of equations of this type.
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    The Sports Training Contract from a Legal Perspective: An Analytical Study in Algerian Legislation
    (2026) Meciel, Soraya; Nouiga, Redhwane
    With the profound transformations experienced by modern sports and the increasing role of the coach as a key party in developing athletes and achieving results, the need has arisen for a special legal contract that defines the relation ship between this coach and sports institutions. However, the particular nature of sports activity raises the issue of understanding the legal classification of this contract as well as identifying its characteristics in Algerian legislation. The analytical method was adopted, where various legal texts in Algerian legislation, such as the Civil Code and the Sports Law, were analyzed.
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    Enhancing Skin Cancer Detection Using Curriculum Learning In Ensemble Deep Learning Context
    (2026) Meghatria, Riadh; Gaceb, Djamel; Touazi, Fayçal; Boukert, Tina; Ben Aidrene, Sarah
    Accurate classification of skin lesions, particularly for melanoma detection, remains a critical challenge in medical image analysis. Leveraging recent advances in deep learning, this paper investigates the use of curriculum learning in ensemble deep learning context for melanoma classification. To validate the proposition, three primary strategies are compared: transfer learning of CNNs using VGG16, ResNet50, and EfficientNetB0 models; ensemble learning techniques such as bagging; and curriculum learning that progressively guides training in increasing order of complexity. Experiments conducted on the ISIC 2019 and 2020 dermoscopic image datasets demonstrate that curriculum learning applied to EfficientNetB0 achieves superior classification performance, reaching an F1- score of 90.77%, outperforming conventional fine-tuning and ensemble approaches. These results underscore the potential of integrating curriculum learning in nsemble learning context with state-of-the-art CNN architectures to improve the robustness and accuracy of automated melanoma diagnosis.
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    Control and stabilisation of strongly coupled hyperbolic systems with kinetic boundary conditions and implicit memory effects
    (2026) Addoun, Rayan Ikram; Laoubi, Karima
    In this paper, we investigate a coupled system of hyperbolic equations with control applied to one of the two parameters. A key feature of this work is the integration of a kernel modelled as a functional that implicitly incorporates the system's history. The memory term is represented by an integral involving a fractional operator with exponent ℓ, where the amplitude of the functional is explicitly linked to this exponent. The interaction between the amplitude ϱ and the exponent ℓ plays a crucial role in the dynamic behaviour and stability properties of the system. We demonstrate that the polynomial stability depends on the interaction between the memory kernel, the fractional operator's exponent ℓ, and the amplitude ϱ, while also studying the system's optimal controllability. Under appropriate assumptions, we establish that the solutions decay at the rate , where the decay is influenced by both the amplitude and the infinite memory. Furthermore, detailed spectral analysis provides asymptotic expressions for the eigenvalues, confirming the optimality of the obtained decay rates.
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    Prevalence and Distribution of Postural Deformities among Middle-School Non-Sporting Students: A Cross-Sectional Study
    (Université Ziane Achour de Djelfa, 2026) Bellem, Issam; Seghari, Taqieddine
    Background: Postural deformities in adolescents are becoming a significant public health issue, as they can greatly affect musculoskeletal health, functional abilities, and overall well-being in the long run. Objective: This study aimed to explore how common, widespread, and severe postural deformities are among middle-school students who aren't involved in organized sports. Methods: We conducted a cross-sectional descriptive study involving 270 middle-school students in the Wilaya of Setif (Algeria) in 2022. To assess posture, we used a standardized visual grading system (NYRP) that looked at various anatomical areas, including head alignment, shoulder posture, spinal curves, pelvic alignment, abdominal posture, and foot structure. Each postural deviation was rated on a three-level scale (no deviation, slight deviation, marked deviation). The overall quality of posture was categorized as good, acceptable, or poor based on the cumulative scores from the New York Posture Rating test. Results: The findings indicated a high prevalence of postural deformities among the students. Overall posture assessment showed that 62.59% of participants had poor posture, 33.33% had acceptable posture, and only 4.07% were rated as having good posture. The most common postural issues included lateral head tilt (84%), rounded shoulders (77%), thoracic kyphosis (69%), abdominal protrusion (64%), and flat foot (60%). While most deformities were mild, a significant number of students exhibited moderate to severe deviations, indicating a potential risk for musculoskeletal problems. Conclusion: The high prevalence of postural deformities among middle-school students who do not engage in sports highlights the urgent need for early screening programs, school-based education on posture, and preventive or corrective physical activity interventions. By implementing structured posture-focused strategies in schools, we can help slow down the progression of musculoskeletal dysfunction and enhance the health of adolescents.
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    Combining Classifiers for Delineation of Raining Cloud over North Algeria and Mediterranean Sea
    (2026) Bensafi, Noureddine; Lazri, Mourad; Absi, Rafik; Labadi, Karim; Ameur, Soltane
    In this paper, we presented the application of the classifier combination technique to classify cloud systems, namely stratiform and convective systems. The data used come from the SEVIRI (Spinning Enhanced Visible and Infra-Red Imager) radiometric imager on board the MSG (Meteosat Second Generation) satellite. The methods were trained and evaluated with satellite and radar data of the rain event of October 10, 2018 in the south of France provided by Météo-France. This allowed us to evaluate and compare the performances for cloud identification of two methods frequently used in combination of classifiers .
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    The Role of Civil Society in Strengthening the Soft Power of the Algerian State – The Tedjania Order as a Model
    (2026) El Hadj Ahmed, Mohammed Yacine; Djeddi, Ala Eddine; Ben Khalifa, Hamza
    This study aims to examine the role of civil society in strengthening Algeria’s soft power by analyzing the model of the Tedjania order, as one of the most significant institutions of Algerian civil society. The Tedjania order possesses the capacity for internal and external adaptation and influence. The study also assesses the extent to which the Algerian state has successfully utilized it as a soft power resource contributing, domestically, to the preservation of national identity security and, externally, to the promotion of values of love, peace, and moderation.The research adopts Samuel Huntington’s framework to measure the institutional indicators of the Tedjania order—Algerian in origin and headquarters, yet global in its spread and influence—while also evaluating the degree of success achieved by the Algerian state in employing it as a source of soft power.The study concludes that Algeria has indeed begun adopting the strategic option of wisely employing the concept of soft power, particularly within African relations, by leveraging the Tedjania order as one of its resources. However, in terms of governance, development, and the structured management of soft power instruments, efforts remain relative and require improvement in the mechanisms employed.