Afaf Mellouli , Ahmed Hemici , Amina Mekhalfia , Khawla Moumeni

كلية علوم الطبيعة والحياة وعلوم الأرض والكون-جامعة 8 ماي 1945 قالمة · الجزائر

L’allergie, en particulier alimentaire, est une affection mondialement répandue. Elle est souvent présentée comme le mal du 21ème siècle. En effet, le nombre de cas d’allergie est en nette et constante augmentation. Ceci est dû aux modifications de plusieurs facteurs :alimentaires, écologiques, professionnels, mode de vie, etc. La progression exponentielle de LA production, de la consommation et des transports s’est accompagné de nombreuses innovations techniques à l’origine de l’augmentation du nombre de personnes allergiques.Les chimiokines bien qu’elles soient des molécules de découverte récente, dont la fonction principale est de guider de façon précise la migration cellulaire, leur place exacte dans la physiopthologie de certaines maladies, y compris celles d’origine allergique, rest encore à définir. Il en est de même pour le rôle attribué aux récepteurs de chimiokines aucours des manifestations allergiques. Cependant, certains récepteurs ou chimiokines apparaissent relativement spécifiques d’un type cellulaire ou d’un groupe de cellules particulier, impliquées dans le même type de réaction pouvant conduire ultérieurement àl ’apparition de plusieurs maladies.C’est ainsi qu’en ce qui concerne l’allergie alimentaire, le récepteur intestinal CCR9 etles chimiokines CCL-5 (RANTES), CCL-11 (éotaxine 1), CCL17 et CCL22 et leur récepteur,ainsi que CXCL12 et ses récepteurs CXCR4 et CXCR7 semblent particulièrement impliqués dans son évolution en asthme allergique. Dès lors, ces chimiokines et/ou ces récepteurs apparaissent comme des cibles potentielles importantes pour de futurs traitements antiallergiques. En revanche, l’identification d’antagonistes spécifiques de récepteurs pour les chimiokines devrait offrir dans un futur proche de nouvelles perspectives thérapeutiques,particulièrement dans le domaine de l’allergie.

Benhabib Mohammed El Hadi, L. Merad

كلية التكنولوجيا-جامعة أبو بكر بلقايد - تلمسان · الجزائر

La tâche présentée dans ce mémoire de master s’inscrit dans le domaine de laconception d’antennes pour la tomographie micro-onde ainsi que la configuration du montagede mesure.Dans le premier chapitre, on a présenté les techniques d'imagerie micro-ondes les pluscouramment rencontrées et les systèmes radars utilisés dans l'imagerie.Le deuxième chapitre, à été consacré à la présentation de la technique tomographiquemicro-ondes spécialement appliquée au cancer du sein.En dernier lieu, nous avons proposés deux type de montages nécessaires à based'antennes ULB pour la détection du cancer du sein. Le champ électrique diffusé peutconstitué une base de données pour la reconstruction de l'image du sein en 2D. Les résultatsde simulations sont très satisfaisant d'un de vue adaptation des antennes. Le choix du typed'antennes ULB et leur position autour du sein représente le paramètre clé pour lareconstruction des images en 2D.Des perspectives intéressantes peuvent êtres envisagées à savoir : développement del'algorithme de reconstruction en se basant sur les techniques déjà énumérées en chapitre 2.

Yesma Djenane, S. Zitouni, A.Khireddine, Nabila Derrasse Chouk

كلية التكنولوجيا-جامعة عبد الرحمان ميرة - بجاية · الجزائر

لبنى بن علي, بن عليه بن البار , بن عيسى, هاجر دبي

كلية العلوم الانسانية والاجتماعية-جامعة محمد بوضياف - المسيلة · الجزائر

من خلال لدراسة اتضح لنا الدور الفعال والحيوي الذي تلعبه إستراتيجية الاتصال في تحسين أداء المؤسسة العمومية الخدماتية في الجزائر ،لأنه يعتبر من الأنشطة الأساسية لقيام المؤسسة بمهامها على أكمل وجه ،اذ أن غياب وعدم فعالية استراتيجة الاتصال يسبب الكثير من الاضطرابات والعراقيل للمؤسسة ،خصوصا أنه تم رصد غياب أشخاص مكلفين بإعداد وتسيير استراتيجية الاتصال داخل المؤسسة (محل الدراسة) ،مما فرض على المؤسسة الجزائرية وخاصة الخدماتية بإعتبارها تعمل على التواصل وبصورة مباشر مع الجمهور، الاهتمام بإستراتيجة الاتصال لتحسين أداء المؤسسة وتحقيق غايتها من خلال وجود فريق عمل خاص يعمل على متابعة وحسن تسيير استراتيجية الاتصال هذا من جهة ،وكذلك العمل على تعزيز الثقة بالجمهور وتقديم أفضل النتائج والخدمات واعطاء صورة مشرفة ومرضية للمؤسسة من جهة أخرى. وقد ارتبطت اشكالية دراستنا هذه حول الدور الذي تلعبه استراتيجية الاتصال في تحسين أداء المؤسسة العمومية الخدماتية في الجزائر ،اذ يمكن القول أنه على المؤسسة تبني استراتيجية اتصال فعالة للحصول على أداء حسن ومتميز لتضمن الوصول الى غايات وتحقيق الخطة العامة للمؤسسة.

Van Bakhtyar Muhamad Rauf

كلية اللغات-جامعة السليمانية · العراق

Salih Ahmed Babiker, Salwa EL Fadil Ibrahim

كلية الإنتاج الحيوانى-جامعة الخرطوم · السودان

Thirty six entire desert male kids, divided randomly into three groups A, B and C in a completely randomized design, were involved in this study. The kids were kept for a pre- experimental period of a month during which they were fed molasses concentrate (52% molasses, 39% wheat bran, 5% groundnut cakes, 3% urea and 1% common salt) plus sorghum straw basal diet. Group A was fed the high dietary energy level (12.2 MJ/kg DM), group B offered the medium energy level (10.3 MJ/kg DM) while group C was offered the low energy diet (8 MJ/kg DM). Green fodder (Medicago sativa) was offered at a rate of half kilogram twice a week/head. The overall rates of weight gain were 0.48 kg per week 0.38 kg and 0.024 kg for high, medium and low dietary energy levels, respectively. The difference was significant (P<0.00I). Kids fed on high and medium dietary energy levels ate 7.6 and 11.95 kg dry matter to obtain one kilogram live weight gain compared to 24.06 for the low dietary energy level. The difference in feed conversion rate was significant. The dietary energy level produced significant effect on dressing percentage on both full and empty body weight basis. The values on hot basis were 50.42, 48.7 and 44.16% on full basis, and 55.15, 54.66 and 51.4% on empty basis for high, medium and low dietary energy levels, respectively. The dietary energy level also produced significant (P<0.0l) effect on the muscular tissue percentage which was 64.17, 63.43 and 59.04 for high, medium and low dietary energy levels. The total bone percentage was significantly (P<0.00l) higher in the low energy diet. The high and medium dietary energy tended to deposit more fat in their carcass 8.2 and 6.99%, respectively compared to 3.79% in the low dietary energy level. Muscle: bone ratio was significantly higher in high (2.69) and medium (2.59) compared to 1.93 for low dietary energy. Dissection of commercial joints indicated that high and medium dietary energy levels had significantly more muscle, less bone and significantly higher percentage of fat compared to the low dietary energy. Meat chemical composition of the three dietary energy treatments showed that the fat percentage was higher in high and medium energy dietary energy levels, the ash content was significantly (P<0.00l) high in the low dietary energy. The sarcoplasmic and myofibrillar protein percentage were affected significantly (P<0.001) by the dietary energy and were higher in the high and medium energy level compared to the low energy level. The dietary energy level significantly affected the Hunter colour components of the meat, redness (a) (P<0.00l) and yellowness (b) (P<0.05). Although the water holding capacity and cooking loss percentage were not significantly affected, lower values were observed in the high and medium dietary energy compared to the low level. Shear force was significantly (P<0.0l) affected by dietary energy level. Higher values of shear force and connective tissue strength were observed in the meat of low dietary energy level compared to the high and medium levels.

Salem Mohammed Bashmal, Yehia A. Khulief

كلية الهندسة-جامعة الملك فهد للبترول والمعادن · السعودية

-Drillstring undergoes several modes of vibrations simultaneously. These vibrations can be classified into three main groups based on their directions: axial, transverse and torsional vibrations. Coupling between these vibrations is possible and it yields uncertainty in vibration analysis and monitoring. Stick-slip in drillstrings is a specific type of torsional vibrarions. Stick-slip involves periodic fluctuations in bit rotational speed, ranging from almost zero velocity to a stage of high rotational speed, often more than twice the surface speed. In this study, a dynamic model of the drillstring is formulated using consistent mass finite element approach. The developed model accounts for the coupling between axial and bending vibrations, the dynamic coupling between bending and torsional vibrations as well as the effect of rotary inertia, gyroscopic moment and gravitational axial stiffening. Stick-slip is modeled using proper downhole boundary conditions, which admit the excitation of stick-slip oscillations. The effects of stick-slip are investigated by studying the associated dynamic responses of the drillstring.

رمضان خطوط, سمية مرنيز

كلية العلوم الانسانية والاجتماعية-جامعة محمد بوضياف - المسيلة · الجزائر

Amin Moh'd AlSharif, Saad Ahmed

كلية الهندسة-الجامعة الأمريكية - الشارقة · الامارات

The flowfield characteristics downstream of an axisymmetric suddenexpansion dump combustor model are important to designers of gas turbines and liquid-fuel ramjets ducted rockets. Many experimental techniques such as Laser Doppler Velocimetry (LDV) measurements provide only limited discrete information at given points; especially, for the cases of complex flows such as swirling flows of a dump combustor. For these types of flows, usual numerical interpolating schemes appear to be unsuitable. Artificial Neural Networks (ANN) methods are thus proposed as an alternative and the flow predictions obtained are tested and presented in this thesis. To predict the velocity components and the turbulence statistics obtained experimentally under a variety of swirl numbers, the use of a variety of ANN architectures is investigated. In each case, the predictions obtained are compared with published experimental data to determine the ANN structure that predicts the flow parameters most accurately. Moreover, the generated data is used to provide contour and surface plots to show the detailed flow characteristics throughout the model. The examined turbulence statistics are fluid flow velocity components in axial, radial, and tangential directions, in addition to Reynolds shear and normal stresses. Also triple velocity correlations are scrutinized. The investigation of ANN architecture variation shows that generalized feedforward network (GFF) with one hidden layer is the most efficient network, in which most turbulence statistics are predicted accurately. Moreover, the study shows that GFF network performs better when its built architecture uses Levenberg-Marquardt learning rule and Tanhaxon transfer function for weights update. The obtained results look promising, thus, ANN is utilized to enhance the understanding of the behavior of swirling, recalculating, axisymmetric, and turbulent flow inside dump combustors. ANN is employed to compute kinetic energy terms (production, diffusion, convection, and viscous dissipation as well as estimating stream function to recognize the recirculation regions at combustor's corners and centerline.

BOUHITEM Tayeb, CHAOUKI Nihad

كلية الاداب واللغات-جامعة محمد خيضر - بسكرة · الجزائر