Institutional repository of university M'Hamed Bougara Boumerdes
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Elaboration of a new Activated Carbon derived from the Crown of Oak (ACOW) to removal the toxic Iodine: Kinetic, Isotherms modelling and Thermodynamics Study
No full textThe current study aims to develop a new adsorbent material using oak crown and explore its effectiveness in removing I2 ions through a series of batch experiments. ACOW was characterised by zero charge (pHpzc) and FTIR spectroscopy. The impact of the initial I2 concentration (20-100 mg/L), temperature (25-55 °C), pH (2-14), adsorbent dosage (2-10 g/L), Stirring speed (100-900 rpm), particle size (100-2000μm) and contact time (0-30 min) on I2 adsorption was examined. The adsorption kinetic obeys the pseudo-second order model with a determination coefficient (R2) equal to 0.999. Adsorption follows the Langmuir equation well, with the best fit to the experimental data at equilibrium. A qmax value (= 103.606 mg/g) at 25°C and 120.773 mg/g at 55°C were eliminated under the optimised conditions, indicating homogeneous adsorption on the surface of the adsorbent. The thermodynamic parameters gave a negative free energy ΔGo (-3.445 to -5.629 kJ/mol), a positive enthalpy ΔHo (18.406 kJ/mol) and an activation energy Ea (= 22.599 kJ/mol), thus confirming the spontaneous and endothermic nature of adsorption of iodine on ACOW. The positive entropy ΔSo (0.0733 kJ/mol K) show increased randomness of the solid-liquid interface during the adsorption
Vision Transformer Model for Gastrointestinal Tract Diseases Classification from WCE Images
No full textAccurate disease classification utilizing endoscopic images indeed poses a significant challenge within the field of gastroenterology. This research introduces a methodology for assisting medical diagnostic procedures and detecting gastrointestinal (GI) tract diseases by categorizing features extracted from endoscopic images using Vision Transformer (ViT) models. We propose three ViT-inspired models for classifying GI tract diseases using colon images acquired through wireless capsule endoscopy (WCE). The highest achieved accuracy among our models is 97.83%. We conducted a comparative analysis with three pre-trained CNN (Convolutional Neural Network) models namely, Xception, DenseNet121, and MobileNet, alongside recent research papers to validate our findings
الآثار القانونية للعقد الالكتروني
No full text261 ص. ، 30 سمتأثرت نظرية العقد بالتطور التكنولوجي الذي ساد مختلف المجالات ، و نتيجة لذلك ظهر العقد الالكتروني و الذي أصبح الوسيلة الأكثر اعتمادا للتعاقد، وتعتبر الآثار القانونية التي يرتبها العقد المبرم عبر شبكة الإنترنت ذا أهمية فبمجرد استفاء العقد لأركانه وشروط صحته يرتب أثار قانونية تتوزع بين المتعاقدين سواء فيما يخص الالتزامات والمسؤولية الملقاة على عاتقهما، فالنسبة للالتزامات فقد رتب المشرع على عاتق المورد التزام بنقل الملكية والالتزام بالتسليم والالتزام بالضمان كما أقر للمستهلك التزامات تتمثل في الالتزام بدفع الثمن و الالتزام بالتسليم، ويترتب على الإخلال بهذه الالتزامات مسؤولية مدنية بنوعيها عقدية و تقصيرية، كما يترتب على الإخلال بهذه الالتزامات مسؤولية جزائية وهذا في ظل قانون العقوبات أو في ظل القوانين الخاص
إستخدمات تقييم الأداء المالي لتوجيه الإستثمار في شركات التأمين: دراسة ميدانية ادى محلل مالي (محافظ الحسابات)
No full text108p.:ill.;30cm
Evaluation of the morphological and physicochemical diversity of carob (ceratonia siliqua, fabaceae) germplasm from algeria
No full textDespite the economic and ecological importance of the carob tree, few studies are available on the morphological characterization and chemical composition of carob in Algeria. This has resulted in the lack of selection of commercial cultivars of high seed and sugar content. The present study aims to assess the diversity of 11 wild and 1 cultivated carob populations in various regions of Algeria, characterized by diverse geographical and climatic conditions. The final objective is to assess the diversity of neglected carob plants that exhibit superior fruit quality traits and/or are well adapted to different pedoclimatic conditions. The current study focuses on analyzing pod and seed diversity by investigating 12 morphological and 5 physiochemical traits. The analysis of variance revealed significant differences between populations (p < 0.001) for all traits studied, indicating high morphological and chemical variability among these carob populations. Principal component analysis (PCA) was employed to study the relationship between these traits and the geographical origin. High seed yields characterized wild populations, whereas cultivated populations were rich in sugar. Based on morphological traits of pods, seeds and chemical compositions, a hierarchical clustering grouped the carob populations into four groups. The findings of this study represent a significant advancement towards establishing effective cultivar breeding programs in Algeria. They demonstrate that the germplasm examined in this research exhibits an optimal level of morphological and chemical diversity, which is instrumental in the identification of specific traits of both commercial and environmental significance
دور المستوردين الخواص في تلبية حاجيات السوق الوطنية: دراسة حالة AMENHYD SPA
No full text124p.ill.:30cm
Biomedical security : performance study and analysis
No full text95 p. : ill. ; 30 cmThis thesis investigates the development of a robust approach for securing medical data through watermarking techniques, with a specific focus on the application of QR code encryption. The research addresses the pressing need for improved security measures in medical data transmission and storage, considering the vulnerability of patient information to unauthorized access and manipulation. Through a comprehensive literature review and analysis of existing methods, the thesis identifies key challenges in medical image watermarking, including limitations in payload capacity, imperceptibility, and robustness against attacks.
To address these challenges, the research proposes a novel watermarking approach that leverages QR code encryption to enhance both security and capacity within medical images. The methodology involves embedding QR code representations of Medical Imaging Test Reports (MITR) into the non-interest regions of medical images using Discrete Wavelet Transform (DWT) and Singular Value Decomposition (SVD) techniques. Evaluation of the proposed method is conducted using performance metrics such as Peak Signal-to-Noise Ratio (PSNR), Structural Similarity Index (SSIM), and Normalization Coefficient (NC).
The results demonstrate significant improvements in payload capacity, imperceptibility, and security against various attacks compared to existing watermarking methods. The pro- posed approach offers a balance between security requirements and practical considerations, making it suitable for real-world applications in medical data transmission and storage. Overall, this research contributes to advancing the field of medical image watermarking and lays the foundation for future developments in biomedical securit
Theoretical Study on Advertising Deception and Its Impact on Consumers
No full textAdvertising is a pivotal element in the landscape of marketing, primarily focused on capturing consumer attention and enhancing sales volumes. It holds a critical position in fostering brand recognition and influencing purchasing decisions. Nevertheless, the realm of advertising has been subject to substantial scrutiny due to the prevalence of deceptive and misleading practices that furnish consumers with erroneous and incomplete information. This study aimed to highlight how advertising deception affects consumers' behavior and their trust in the brand. It concluded that advertising deception negatively affects both consumer psychology and the organization's reputation, in addition to a decline in customer support and loyalty to the brand
Étude et évaluation du comportement physique d'un système réseau de collecte «Tinhert»
No full text123 p. : ill. ; 30 cmDans un contexte mondial où la demande énergétique continue de croître de manière exponentielle, l'efficacité et la fiabilité des infrastructures de collecte et de transport des ressources naturelles sont devenues essentielles. Cette étude vise à étudier et à évaluer le comportement physique d'un système de réseau de collecte dans le champ « Tinerhert ». L'objectif principal est d'améliorer l'optimisation opérationnelle de ce champ tout en assurant la sécurité et la durabilité des infrastructures. L'étude se concentre sur la détermination des valeurs de pression, température, fraction de liquide dans le gaz et les régimes d'écoulement le long des Flowlines et Trunklines par le simulateur « OLGA », afin de vérifier l'état des pipes constituant le réseau de collecte dans les champs de « Tinerhert ». Elle vise à comprendre les contraintes mécaniques, thermiques et hydrauliques auxquelles les infrastructures sont soumises par le simulateur « CAESAR II »
L'impact des géométries sur l'éclatement tourbillonnaire
No full text108 p. : ill. ; 30 cmles parois rigides délimitant les cavités. La corrélation démontrée dans ce travail, exprime le sens physique du problème, et ainsi présent la solution de la couche limite sur une gamme de nombre de Schmidt (0.5-1) pour des paramètres bien préci