DSpace at UMBB
The institutional repository of the University M'Hamed Bougara Of Boumerdes is a digital archive that contains the scientific output of the University. Dspace manages, preserves and provides access to the academic works of UMBB.
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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.
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.
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 .
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.
الحجاج والمساءلة لدى ميشال مايير (النّظريّة الخَطابيّة في ضوء علم الأشكلة
(جامعة الأ مير عبد القادر للعلوم الإ سلامية قسنطينة – الجزائر, 2026) ويدير, نادية
تطرح هذه الدراسة مجموعة من التّساؤلات تتصل بالقيمة المضافة للحجاج التّساؤلي في سياق النّظريات الحجاجيّة الرّهنة، وينصرف اقتران الفكر التّساؤلي بالحجاج إلى بيان خلفيّة نظرية المساءلة وبعدها الإيديولوجي. تم توزيع مادة هذا البحث على سبعة عناوين كبرى تتخللها عناوين فرعيّة تشمل خلفيّة مايير الفلسفيّة ومنطلقاته المعرفيّة، إضافة إلى مفاهيم ومكوّنات وتقنيات الحجاج التّساؤلي، وقد توصّلنا إلى أنّ فلسفة المساءلة والاستشكال، وعلاقتهما بالحجاج، هي فلسفة ما بعد حداثيّة تطمح إلى التّفاوض والتّعايش غير أنّها تخفي نواحي إيديولوجيّة لا تظهر للعيان