http://archives.univ-biskra.dz/handle/123456789/5 2026-04-10T04:19:51Z 2026-04-10T04:19:51Z بولرباح نعامة http://archives.univ-biskra.dz/handle/123456789/31848 2025-11-18T08:47:29Z 2025-01-01T00:00:00Z

Titre: مضاهر الصراع الثقافي في البرامج التلفزيونية الحوارية من منضور مقالربة الجندر Auteur(s): بولرباح نعامة Description: اداعة وتلفزيون

2025-01-01T00:00:00Z نزيهة بن شارف http://archives.univ-biskra.dz/handle/123456789/31847 2025-11-18T08:44:56Z 2025-01-01T00:00:00Z

Titre: توضيف المهارات الاتصالية لدى القاءد الاداري اثناء الازمات Auteur(s): نزيهة بن شارف Résumé: The study aims at researching the level of employing the communication skills of the administrative leader during crises at Biskra state headquarters from the point of view of employees, as well as the correlation between the effectiveness of administrative leadership and the level of employing these skills, represented by the skill of listening, strategic thinking, speaking, and diving into their dimensions, and the degree of strength of the correlation they are the observation and the questionnaire form ،As well as the use of the statistical program Spss v22 in the extraction of statistical results, we have reached in this study a set of important points, we mention as follows: * There is a strong level of employing the listening skill of the administrative leader while dealing with crises from the point of view of employees at the state headquarters. * There is strength in the level of employing the strategic thinking skill of the administrative leader during his crisis management for the staff of the state. * There is a strong level of employing the speaking skill of the administrative leader during crises from the opinion of the staff at the state headquarters. * There is an average direct correlation between the effectiveness of managerial leadership during crises and the employment of communication skills, attributed to personal variables (gender, educational level, managerial rank, number of years of experience). *Reaching a communication model that achieves the objectives of this study; linking all the essential points of the study, namely communication skills, administrative leadership, crisis management. Description: اتصال وعلاقات عامة

2025-01-01T00:00:00Z Rahal Rahima http://archives.univ-biskra.dz/handle/123456789/31693 2025-10-28T09:19:05Z 2025-01-01T00:00:00Z

Titre: Synthesis and study of the dielectric properties of a doped NBT type material Auteur(s): Rahal Rahima Résumé: The present study reports the fabrication of NBT-type ceramic materials with the general formula (Na0.5Bi0.5) 0.94 R 0.04Ti 0.95 (Ni0.2 Fe0.2 Sb0.6) 0.05O3 (abbreviated as NBT-RNFS), where R denotes the dopant elements La, Nd, Gd, and Y. The ceramics were synthesized via the conventional solid state reaction method. The main objective of this study was to investigate the effect of rare earth doping on the dielectric and photocatalytic properties of novel NBT-based ceramic materials. The NBT-RNFS samples were successfully synthesized at 1150°C. Undoped NBT-NFS samples had a single rhombohedral phase, while rare earth-doped NBT-NFS samples showed a rhombohedral phase along with a pyrochlore phase. Rietveld refinement of the XRD data showed a slight shrinkage of the unit cell volume with the substitution of rare earth elements, attributed to their relatively lower ionic radii compared to the host ions. Optical bandgap analysis revealed that the fabricated perovskite samples exhibited semiconducting behavior, with measured bandgap values ranging from 2.61 to 2.80 eV. The La-doped NBT-RNFS system exhibited an impressive 83% photocatalytic dye degradation rate, substantially outperforming the 23% dye removal efficiency of the undoped material. Similarly, the Nd-doped (62% dye removal) and Y-doped (66% dye removal) NBT-RNFS ceramics also displayed enhanced photocatalytic activities under broadband solar light exposure. The La-doped NBT-RNFS composition demonstrated an exceptionally high dielectric constant (εr) of 1151.87, while the Nd-doped NBT-RNFS exhibited a dielectric constant of 1122.31. These values significantly exceeded the dielectric constant of 951.02 obtained for the undoped NBT-NFS ceramic.

2025-01-01T00:00:00Z METTAI Merzaka http://archives.univ-biskra.dz/handle/123456789/31692 2025-10-28T09:17:43Z 2025-01-01T00:00:00Z

Titre: Études de différents modes d'interactions entre une cible neuro dégénérative et une nouvelle classe de molécules bioactives : Approches de Docking/Dynamique moléculaire, Replacement bioisostérique et ADME. Auteur(s): METTAI Merzaka Résumé: Monoamine oxidase B and adenosine A2A receptors are used as key targets in Parkinson's disease. The inhibitory power of a new series of phenylxanthine derivatives on two biological targets, the hMAO-B and hA2AR, has recently been demonstrated. Consequently, in our research work we carried out a study of the interactions established between 38 phenylxanthine derivatives with the biological targets hMAO-B and hA2AR. This study is based on the use of various molecular modeling techniques. A molecular docking study revealed that compounds L24 ((E)-3-(3-Chlorophenyl)-N-(4-(1,3-dimethyl-2,6- dioxo-2,3,6, 7-tetrahydro-1H-purin-8-yl) phenyl) acrylamide and L32 ((E)-3-(3-Chlorophenyl)-N-(3-(1,3 dimethyl-2,6-dioxo- 2,3,6,7-tetrahydro-1H-purin-8-yl)phenyl)acrylamide had a high affinity with the cavities of hMAO-B and hA2AR targets (S score: -10.160 and -7.344 kcal/mol respectively), and the stability of the complexes studied was confirmed through molecular dynamics simulations. A molecular electrostatic potential (MEP) analysis of compounds 24 and 32 was also carried out. In addition, the bioisosteric replacement approach was successfully applied to design two new analogues of each compound with low energy scores. Moreover, ADME-T and Drug-likeness results revealed promising pharmacokinetic properties and oral bioavailability for these compounds. Therefore, compounds L24, L32 and their analogues can be further analyzed and optimized to design new, more effective lead compounds for the treatment of Parkinson's disease.

2025-01-01T00:00:00Z