Publications Scientifiques

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    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 ,منيب
    تهدف 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.
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    Optimal Sizing and Localization of Multiple Distributed Generations in Distribution Systems Using an Improved Grey Wolf Optimization Algorithm
    (2024) Benahcour, Souheyla; Bendjeghaba, Omar
    This 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.
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    The Impact Of Administrative Corruption On The Performance Of Local Administration In Algeria
    (Université M'hamed Bougara de Boumerdès, 2023) Benzohra, Ali; Benseghier, Abdeladhim
    This 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.
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    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, Maamar
    Condensation 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.
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    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, Françoise
    3,4-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.
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    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.
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    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 , سارة
    تهدف 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 التحول
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    الطبيعة القانونية للمسؤولية المدنية المترتبة عن الجراحة التجميلية
    (مجلة الدراسات والبحوث القانونية, 2022) كاب، أمال; لالوش، سميرة
    تعد 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
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    Optimizing Foam Concrete Performance Using Mixed Foaming Method: Impact of Mixing Speed, Mixing Duration, And Foam Dosage
    (South Florida Journal of Development, 2024) Galoul, Riadh; Boumchedda, Khaled; Mebtouche, Farouk
    Foamed concrete has gained significant attention, especially in the field of thermal insulation and acoustic insulation. However, all production methods are based on the pre-foaming method, while the mixed foaming method is an infrequent approach that should be considered and could be challenging. For this reason, this paper attempt to highlight this method and valuate it on par with the pre-foaming method in the production of foamed concrete, both in terms of structure and performance. These performances are directly dependent on the pore structure of this material (pore size, porosity rate, and pore distribution). Therefore, a process has been developed for sample preparation to achieve a final product with a well-controlled size and distribution of porosity, meeting the desired performance criteria. This process involves varying the following parameters: mixing speed (from 400 to 1000 rpm), mixing time (from 2 to 12 minutes), and the dosage of foaming agent (from 0.05 to 0.2%). The effect of mixing speed, mixing duration and the dosage of the foaming agent on the generated foam rate, density, structure at the millimeter scale, structure at the micrometer scale, and thermal conductivity was demonstrated. The obtained results show that with a generated foam rate extending to 79%, a density reaching 428 kg/m3, and a thermal conductivity achieving 0.181 w/k.m, the mixed foaming method becomes an important and competitive approach to the pre- foaming method in the production of foamed concrete.