Publications Scientifiques
Permanent URI for this communityhttps://dspace.univ-boumerdes.dz/handle/123456789/10
Browse
4901 results
Search Results
Item دور المدرسة الابتدائية في تطوير النشاط البدني لدى الطفل 'دراسة ميدانية في بعض ابتدائيات ولاية بومرداس(جامعة مصطفي بن بولعيد باتنة 2, 2024) سعدي أوفلة ,ثيزيري; حفيظي ,منيبتهدف هذه الدراسة إلى التعرف على الدور الذي تلعبه المدرسة الابتدائية في تطوير وتنمية النشاط البدني لدى الطفل، حيث أجريت على بعض المدارس الابتدائية بولاية بومرداس أين تم اختيار مجموعة من التلاميذ كعينة لدراسة وتم اختيارهم بطريقة عشوائية بسيطة كما تم اتباع المنهج الوصفي في الدراسة وذلك باستخدام استمارات استبيان كأداة لجمع البيانات والمعلومات، ومن الجانب الاحصائي تم استخدام النسبة المئوية، واختبار كاف التربيع لتحليل البيانات المتحصل عليها من قبل افراد عينة البحث، وبعد جمع البيانات وتحليلها اظهرت النتائج أن للمدرسة الإبتدائية دور في تطوير وترسخ التربية البدنية والرياضية لدى التلاميذ المتمدرسين في الطور الاول وأن الانشطة الرياضية تلعب دورا بالغ الأهمية في تنمبة الجانب الاجتماعي والمعرفي والنفسي والفزيولوجي لدى الطفل.Item Optimal Sizing and Localization of Multiple Distributed Generations in Distribution Systems Using an Improved Grey Wolf Optimization Algorithm(2024) Benahcour, Souheyla; Bendjeghaba, OmarThis study investigates the impact of the localization and sizing of distributed generations in distribution systems using a combined approach of improved grey wolf optimizer (IGWO) and Newton-Raphson load flow algorithms. The suggested method optimizes the size and position of distributed generation generating both real and reactive power while ensuring power system constraints are not violated. The suggested algorithm optimizes the location and sizing of dis-tributed generations. Nevertheless, investigations show that the proposed method outperforms the PSO optimizer and takes less calculation time. Moreover, in contrast with other meta-heuristic algorithms such as JAYA, PSO, SFO, BO, SMA, GA, and GJO, the proposed approach produces a better voltage profile of the distribution system with smaller distributed generator sizes. To demonstrate the advantages of the suggested approach, the IEEE-13, IEEE-37, and IEEE-123 bus distribution systems are used as test cases, and the outcomes are contrasted with those of other meta-heuristic methods. According to simulation data, IGWO outperforms other meta-heuristic algorithms when it comes to the quality of the solution while satisfying all system constraints.Item The Impact Of Administrative Corruption On The Performance Of Local Administration In Algeria(Université M'hamed Bougara de Boumerdès, 2023) Benzohra, Ali; Benseghier, AbdeladhimThis study aims to research the effects of administrative corruption on the performance of local management in Algeria and its consequences. The research aims to identify the manifestations of administrative corruption, its causes and how it affects the performance of local management and then reviews the necessary mechanisms to confront it and at the same time improve administrative performance. In addition, this study concludes that both transparency in management, democratic participation and e-government are mechanisms that reduce negative practices related to administrative corruption and allow for the improvement of local management performance.Item Green synthesis, characterization, structure, biological activity, theoretical calculations and drug-likeness analysis of coumarins(Elsevier, 2020) Khaldi-Khellafi, Nassima; Oukacha-Hikem, Djamila; Terrachet Bouaziz, Souhila; Abdoun, Amar; Makhloufi-Chebli, Malika; Dumas, Françoise; M.S. Silva, Artur; Hamdi, MaamarCondensation of salicylaldehydes and 2-hydroxynaphthaldehyde with various β−dicarbonyl derivatives 2a-c , in the presence of KF-Al 2 O 3 , leads to the synthesis of a series of coumarins 3-8 and benzo[ f ]coumarins 10 respectively by a solvent free reaction under microwave irradiation. The catalyst is recovered by a simple filtration and reused in subsequent reactions. The structure of all synthesized compounds has been established by using analytical techniques such as IR, 1 H and 13 C NMR spectroscopic spectra and elemental analysis. Most of the coumarins exhibited significant antibacterial activity against S. aureus Gram-positive bacteria compared to Cefotaxime as positive control. The compounds 4a and 7a demonstrated moderate antimicrobial activity against compound 8a is extremely sensitive.. In addition, the compounds showed moderate to good antiradical (DPPH) activity. Theoretical calculations let us to confirm the reaction mechanism. Parameters drug-likeness and physicochemical properties including pharmacokinetic analysis of the synthesized compounds was performed using DruliTo program.Item Green synthesis, antioxidant and antibacterial activities of 4-aryl-3,4- dihydropyrimidinones/thiones derivatives of curcumin. Theoretical calculations and mechanism study(Elsevier, 2019) Khaldi-Khellafi, Nassima; Makhloufi-Chebli, Malika; Oukacha-Hikem, Djamila; Terachet Bouaziz, Souhila; Ould Lamara, Kamilia; Idir, Taous; Benazzouz-Touami, Amina; Dumas, Françoise3,4-Dihydropyrimidin-2(1H)-one/thione analogs of curcumin were synthesized in good yield by a onepot multi-component cyclocondensation using curcumin, substituted aromatic aldehydes, and urea/ thiourea in less volume of ethanol catalysed by commercial heteropolyacide Keggin type H3PMo12O40 5% mol as a recyclable and nontoxic catalyst under conventional heating and microwave irradiation. All the synthesized curcumin derivatives 4aen were screened for antioxidant and antimicrobial activity. Biological activity data of the synthesized showed that most of the synthesized compounds exhibited greater antioxidant and antibacterial activity than curcumin. Geometries of synthesized compounds were optimized by using B3LYP method with 6-31G* basis set. Then, DFT based reactivity descriptors such as HOMO, LUMO, chemical hardness, electronegativity, chemical potential were calculated and discussed.Item Linear and nonlinear control design for a quadrotor(2025) Hadid, Samira; Boushaki Zamoum, Razika; Refis, YoucefIn the current study, the quadrotor's nonlinear dynamic model is developed using the Newton-Euler approach. Following that, several nonlinear and linear control strategies for tracking the quadrotor's trajectory are applied. First, by employing distinct controllers for each output variable, direct application of the linear proportional integral derivative (PID) controller to the nonlinear system is realized. This system may also be linearized about an operational point to generate linear controllers, according to the linear quadratic regulator (LQR) demonstration. Nevertheless, in practice, the system dynamics may not always be accurately reflected by this linear approximation and may even be relatively wasteful. Nonlinear regulators, including the feedback linearization (FBL) controller, sliding mode controller (SMC), and modified sliding mode controller (MSMC), perform better in such situations. The trajectory tracking capabilities, dynamic performance, and potential disruption impact of both methods are evaluated and compared. The FBL with LQR was the best controller among them all. The SMC and the MSMC were also very good in tracking the trajectory.Item Sedimentological, petrophysical, and geochemical controls on deep marine unconventional tight limestone and dolostone reservoir: Insights from the Cenomanian/Turonian oceanic anoxic event 2 organic-rich sediments, southeast Constantine Basin, Algeria(Elsevier, 2022) Boutaleb, Khadidja; Baouche, Rafik; Sadaoui, Moussa; Radwan, Ahmed E.Item Study of nanofluids cavitating flow through a venturi using computational fluid dynamics code(2025) Benghalia, Imen; Nehaoua, N.; Zamoum, M.; AMI, I.In this work, we conducted a numerical study of cavitating nanofluid flow through a Venturi. The objective is to investigate the influence of nanoparticles in the base fluid on the cavitation phenomenon. The computational fluid dynamics code (CFD) was selected with a cavitation model. The mixture model for multiphase flow and the k-ω SST turbulence model were adopted. Three fluids were chosen: water, Cu/water and TiO2/water with different volume franctions of nanoparticle (0%, 10% 20%, 30%) . The simulation was conducted with inlet and outlet pressures set at 700 kPa and atmosphere pressure respectively. The numerical results are compared with the previous experimental and numerical data for flow without nanoparticle. The obtained results found that, the presence of the nanoparticles in the base fluid lead to a slight increase in the static pressure, the position of pressure recovery a significant decrease in fluid velocity and an increase in the vapor fraction formation in the flow. Also, the increase of the nanoparticle volume fractions φ results a decrease in the pressure recovery position, fluid velocity and an increase in the vapor fraction formation. Therefore, the presence of nanoparticles in the base fluid promotes the phenomenon of cavitation.Item العلاقة بين تطبيق مبادئ إدارة الجودة الشاملة ونجاح خطة التحول الى الصيرفة الإسلامية دراسة حالة بنك صفوة) بنك الإنماء الصناعي سابقا(جامعة زيان عاشور الجلفة, 2024) جناد , سارةتهدف الدراسة إلى تحديد العلاقة بين تطبيق مبادئ إدارة الجودة الشاملة ونجاح خطة التحول الى الصيرفة الإسلامية من خلال دراسة حالة بنك صفوة او بنك الإنماء الصناعي سابقا، وتحليل التغيرات التي حدثت في بنك الانماء الصناعي قبل وبعد التحول تحديدا بعد ضبط كل الجوانب الإدارية والمعلوماتية والمادية المناسبة. وقد خلصت الدراسة ان من خلال عناصر ومبادئ إدارة الجودة الشاملة يتم وضع خطة مناسبة لتحول الى الصيرفة الإسلامية، من خلال الاطلاع على الممارسات الجديدة وبناء هيكل تنظيمي وتقسيم المسؤوليات بشكل مناسب يحقق الغاية من التحولItem الطبيعة القانونية للمسؤولية المدنية المترتبة عن الجراحة التجميلية(مجلة الدراسات والبحوث القانونية, 2022) كاب، أمال; لالوش، سميرةتعد الجراحة التجميلية من اهم المواضيع التي تستحق دراسة قانونية نظرا لانتشارها الواسع وصعوبة تحديد طبيعتها القانونية التي تثير عدة إشكالات من حيث طبيعة المسؤولية المدنية لجراح التجميل وما تتميز به عن مسؤولية الجراح العادي وذلك في إطار اختلافات فقهية وقضائية. ولقد كانت التشريعات أكثر صرامة فيما يتعلق بمسؤولية الطبيب في جراحة التجميل خلافا لما هو في الجراحات الأخرى. وتظهر أهمية الجراحة التجميلية من خلال أنواعها ومبررات اجرائها وكيف كيفت المسؤولية المدنية لجراح التجميل