Benomier Yacine, عمر صخري

كلية العلوم الاقتصادية والعلوم التجارية وعلوم التسيير-جامعة الجزائر 3 - إبراهيم سلطان شيبوط · الجزائر

Abstract Our thesis first seeks to remedy the issue of passive customer loyalty which is explained by the desire to keep their old numbers while acquiring other temporary numbers to take advantage of the free offers continually launched by the three mobile telephone operators in Algeria. In this regard, the causal model of our research will try to test the following formula: active customer loyalty is the sum of transactional, relational and social loyalty of Generation Z customers. For this purpose, and to test the validity of this model, an empirical part is necessary to conduct a diagnosis of the loyalty programs currently adopted by the three operators under the names of IMTIYAZ from Djezzy, FIDELIZ from mobilis and NOUJOUM from Ooredoo. Then, a qualitative study with a sample of 530 customers is essential to identify the relevant factors of active loyalty in this market.As a conclusion, the analysis of our questionnaire revealed to us the failure of the above programs and showed us that the strategy of active loyalty of Z customers must be based on the valorization of the social and friendly bond that a customer can weave with the sellers of the three mobile telephone operators in Algeria in real and virtual sales spaces. Résumé: Notre thèse cherche en premier à remédier la question de la fidélité passive des clients qui s'explique par le souhait de conserver leurs anciens numéro tout en acquérant d'autres numéros provisoires pour tirer profit des offres de gratuité lancées continuellement par les trois opérateurs de téléphonie mobile en Algérie. A cet égard, le modèle causal de notre recherche va essayer de tester la formule suivante : la fidélité active des clients est la somme de la fidélité transactionnelle, relationnelle et sociale des clients de la génération Z. A cet effet, et pour tester la validité de ce modèle, une partie empirique est nécessaire pour mener un diagnostic des programmes de fidélité actuellement adopté par les trois opérateurs sous les noms d'IMTIYAZ de Djezzy, FIDELIZ de mobilis et NOUJOUM d'Ooredoo. Ensuite, une étude qualitative auprès d'un échantillon de 530 clients est primordial pour identifier les facteurs pertinents de la fidélité active dans ce marché.En guise de conclusion, l'analyse de notre questionnaire nous a révélé la défaillance des programmes ci-dessus et nous a montré que la stratégie de la fidélité active des clients Z doit se fonder sur la valorisation du lien social et amical qu'un client peut tisser avec les vendeurs des trois opérateurs de la téléphonie mobile en Algérie dans les espaces de vente réels et virtuels.الملخص تسعى أطروحتنا أولا إلى معالجة مشكلة ولاء العملاء السلبي الذي يفسره الرغبة في الاحتفاظ بأرقامهم القديمة مع الحصول على أرقام مؤقتة أخرى للاستفادة من العروض المجانية التي تطلقها باستمرار شركات الهاتف المحمول الثلاثة في الجزائر. في هذا الصدد، سيحاول النموذج السببي لبحثنا اختبار الصيغة التالية: ولاء العملاء النشط هو مجموع الولاء المعاملاتي والعلاقاتي والاجتماعي لعملاء الجيل Z. ولهذا الغرض، ولاختبار صلاحية هذا النموذج، لا بد من وجود جزء تجريبي لإجراء تشخيص لبرامج الولاء المعتمدة حاليا من قبل المشغلين الثلاثة تحت أسماء امتياز من جازي، FIDELIZ من موبيليس ونجوم من Ooredoo. ومن ثم، فإن إجراء دراسة نوعية على عينة مكونة من 530 عميلاً أمر ضروري لتحديد العوامل ذات الصلة بالولاء النشط في هذا السوق.في الختام، كشف لنا تحليل استبياننا فشل البرامج المذكورة أعلاه وأظهر لنا أن إستراتيجية الولاء النشط لعملاء Z يجب أن تستند إلى تقييم الرابطة الاجتماعية والودية التي يمكن للعميل أن ينسجها مع بائعي مشغلي الهاتف المحمول الثلاثة في الجزائر في مساحات البيع الحقيقية والافتراضية.

Aicha Bessahraoui , Aicha Saim , Chaima Bouchemal , Nasma Mahboub

كلية علوم الطبيعة والحياة-جامعة الشهيد حمة لخضر - الوادي · الجزائر

Diabetes is a chronic condition characterized by high blood sugar levels. This can be a huge challenge for many, which is why many researchers are looking for natural and alternative treatments that may help manage the disease.Studying and analyzing date seeds as an alternative to natural treatment could be an important step towards providing effective and safe solutions for diabetics. We studied the seeds of dates Ghars grown in Oued Souf, with the aim of exploring the nutritional value, estimating the quantitative chemical content of the date seeds, and estimating its effectiveness as an antioxidant and antimicrobial. With the aim of utilizing, it as a natural ingredient for treating diabetics type 2. We reached the following results:The yield of date seed extract from the Ghars variety was estimated at 12.25%.The results obtained by estimating primary metabolites showed that the date seed contains a high percentage of proteins compared to carbohydrates and lipids. The highest value was recorded for secondary metabolites of polyphenols, flavonoids, and tannins.Qualitative analysis of date pit extract using HPLC showed the presence of 14 phenolic compounds. Antioxidant activity results based on the FRAP test showed that the Ghars date seed extract had strong antioxidant activity, as the IC50 of the extract reached 323.21 ± 0.025 mg/ml, and that of ascorbic acid was 4.57 ± 0.025 mg/ml. The results of antimicrobial activity showed that Escherichia colibacteria are more sensitive to the extract compared to Pseudomonas aeruginosabacteria, Staphylococcus aureusbacteria, and Bacillus subtilisbacteria.The results of antidiabetic activity have been proven through two methods:The first method is to use yeast: date pit extract increases glucose absorption. This confirms that these seeds also improve glucose absorption by human cells and thus help reduce blood sugar. The second method is using the alpha-amylase enzyme: the extract inhibits the action of the alpha-amylase enzyme, thus preventing the hydrolysis of starch into glucose. The IC50 was estimated at 0.229 mg/ml.From the results obtained, we can say that date pits have great effectiveness in maintaining blood sugar levels, making them an ideal choice for diabetics type 2.

BESSAID Abdelhafid, ABDERRAHIM Ahlem

كلية التكنولوجيا-جامعة أبو بكر بلقايد - تلمسان · الجزائر

Dans le cadre de notre projet « analyse des images cellulaires » consiste à appliquerdes méthodes de segmentation des images médicales, dans notre travail nous exploitons desimages de frottis sanguins.Pour cela, nous avons mise en place un système basé sur les techniques de traitement etd’analyse d’images telle que : le filtrage, la segmentation, la morphologiemathématiques...etc., nous terminons ce travail par la mesure d’un certain nombre deparamètres permettant la caractérisation des formes des cellules.La caractérisation des globules sanguins permet d’élaborer une application qui permettra lesuivi et l’aide au diagnostic pour donner une meilleure interprétation de ces images.

فاتن شاوش, مـــاجدة شـــاهيناز بودوح

كلية الحقوق والعلوم السياسية-جامعة محمد خيضر - بسكرة · الجزائر

Cylia Iguercha , Abdelkamel Mouloua, Fayza Meloudj, Yasmina Kheloui

كلية العلوم البيولوجية والزراعية-جامعة مولود معمري - تيزي وزو · الجزائر

La Distomatose hépatobiliaire ou fasciolose est une affection parasitaire due à l’invasion du foie et des canaux biliaires par une espèce de Trématode, Fasciola hepatica appelé communément grande douve du foie. C’est une maladie cosmopolite qui représente des problèmes économiques et de santé dont le diagnostic est rarement fait, c’est généralement une découverte à l’abattoir. Elle touche principalement les animaux et quelque fois l’homme.Notre travail est une étude rétrospective portant sur les sept dernières années (2014 à 2020). Nous avons enregistré une prévalence de la fasciolose bovine de 1.29% au niveau de la wilaya de Tizi-Ouzou, l’abattoir d’Azazga a connu le plus grand nombre de cas der Fasciola hepatica avec un taux de 52% sur l’ensemble des cas de distomatose enregistrés. Les deux autres abattoirs ont présenté des taux plus modestes, l’abattoir de DBK 32% et celui de Tala Athman 15%. En ce qui concerne la dynamique saisonnière, nous n’avons enregistré aucune différence significative entre les différentes époques de l’année. Enfin l’enquête rétrospective qu’on a réalisée a montré que le plus grand taux d’infestation par la fasciolose chez les bovins revient à l’année 2019 avec un taux de 1.7%.

Khaled Sellami, Naima Lamari, Sylia Idiri

كلية العلوم الدقيقة-جامعة عبد الرحمان ميرة - بجاية · الجزائر

Le but de ce travail est de réaliser une application desktop de gestion de restauration en utilisant l'environnement de développement (NetBeans, Wamp, Scenenbuilder). En collaboration avec l'entreprise Gouraya Froid, une étude approfondie des besoins spécifiques a été menée, conduisant à la conception d'une application sur mesure. Grâce à une approche de développement orienté objet basée sur le cycle de vie UP et à l'utilisation du langage UML pour la modélisation, conduisant à la mise en œuvre dans la fin du processus. Une application conviviale et intuitive a été développée avec les outils évoqués. Les tests rigoureux effectués ont assuré la fiabilité et la qualité de l'application. Ce projet a été une expérience enrichissante, combinant compétences informatiques et passion pour la restauration, avec une contribution concrète à l'amélioration des opérations de Gouraya Froid.

Mohamed Abaid, Omar Hussein Dib,

كلية الزراعة والعلوم الغذائية-الجامعة الأمريكية في بيروت · لبنان

Cyclodextrin based metal organic framework crystals (CD-MOFs) were prepared by methanol vapor diffusion into an aqueous solution of potassium hydroxide and γ-cyclodextrin. The trapped water during the formation of the CD-MOF crystals was then evacuated using various solvents with different polarities. Consequently, the morphology and stability of the crystals were evaluated using thermogravimetric analysis (TGA), powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and colorimeter. In addition to the specific surface area, pore size and total pore volume were determined using the nitrogen adsorption technique. According to the XRD and SEM results, the crystalline structure of CD-MOFs remained intact upon activation regardless of the polarity of the organic solvent used during activation. Moreover, the findings from FTIR and TGA indicated that water has been evacuated from the pores. Furthermore, the various solvents with polarities ranging from 0 (hexane) to 5.1 (methanol and acetone) used for activation didn’t reveal any significant impact on the surface area and total pore volume of the crystals. CD-MOF activated with hexane showed a surface area of 1063 m2-g and a total pore volume of 0.42 cc-g whilst crystals activated using methanol showed a surface area of 1036 m2-g and total pore volume of 0.40cc-g. These results show that polarity has no effect on surface area, pore volume, crystallinity, and thermal stability of CD-MOFs.

Marie-Reine Azar, Ziad Rashed

كلية العلوم الطبيعية والتطبيقية-جامعة سيدة اللويزة · لبنان

The origin of mathematical matrices lies with the study of systems of simultaneous linear equations. Today, they are used not simply for solving systems of simultaneous linear equations, but also for describing the quantum mechanics of atomic structure, and even for designing computer game graphics. Matrices are very useful due to the fact that they can be easily manipulated. We use the notation A-1 to denote the inverse of a matrix A. One of the major uses of inverses is to solve a system of linear equations. You can write a system in matrix form as AX=B, then X=A-1B. Inverses are also used in communication through coded messages. The use of coding has become particularly significant in recent years (due to the explosion of internet for example). One way to code a message is to use matrices and their inverses. Indeed, consider a fixed invertible matrix A. Convert the message into a matrix B such that AB is possible to perform. Send the message generated by AB. At the recipient end, they will need to know A-1 in order to decode the message sent. Indeed, we have A-1 (AB) =B, which is the original message. There are two classes of methods for finding the inverse matrices. Direct methods; a finite number of arithmetic operations leads to an exact solution. Examples of such direct methods include Gauss elimination, Gauss-Jordan elimination, the matrix inverse method and LU factorization. Methods of the second type are called Iterative methods. Iterative methods start with an arbitrary first approximation to the unknown solution. These methods are used for finding the inverse matrices of large systems of equations. In this thesis, we will work on Matrix, Matrix norm, Norms and Matrix Inversion. We did some examples on how to find the inverse of a matrix using a direct method. We recalled the definition of order of convergence throughout an example. Then in chapter 2, we showed that the following iteration method Xn+1=∑_(i=0)^p▒Xn (I -AXn )i . Converges to A-1 under the assumption ||I - AX0|| < 1. We also showed that the order of convergence is p+1. Then we found an upper bound on the norm of difference between m's iteration and the exact value of the Matrix inverse. This generalizes the results presented in [15], where the author only considered the case p = 1. First, we dealt with case p = 2, then the case p = 3. We also illustrate with a simple numerical analysis how the iteration works. Afterwards, we generalize the results presented in [15] for arbitrary p.

بورقبة مصطفى, روان عبد القادر

كلية العلوم الاجتماعية والإنسانية-جامعة زيان عاشور - الجلفة · الجزائر

Michael Kaminski, سبتري أسميدي تشان

كلية العلوم-جامعة الملك فهد للبترول والمعادن · السعودية

The study of foraminifera from the Cenozoic formations especially in Eastern Saudi Arabia has not been fully documented compared to the Mesozoic carbonate and siliciclastic formations, which have been extensively investigated both in outcrop as well as in the subsurface due to their importance in the Arabian petroleum system. Regionally, few micropaleontological studies have examined the foraminiferal distribution in the Dam Formation, located in the Dammam Dome area, or the Dam Formation from southwestern Qatar. The Dam Formation exposed in the Al Lidam area however, has not been investigated for the distribution of foraminifera.Four outcrops along the west to east direction from the Al Lidam escarpment were investigated in this study for paleoenvironmental reconstruction and to understand the vertical and lateral distribution of foraminiferal assemblages. The samples were processed using the standard acetic acid method, which extracts foraminifera from the lithified carbonate rock without destroying the fossil content. Disaggregation using acetic acid shows promising results, the foraminifera assemblage from the Dam Formation is dominated by calcareous porcellaneous Miliolina genera (Quinqueloculina, Peneroplis, Triloculina, Cornuspira, Sigmoilinita, Coscinospira, Spirolina, Pyrgo, Borelis), followed by hyaline forms (Elphidium, Ammonia, Cibicides, Discorbinella) and a minor percentage of agglutinated forms, e.g., Textularina.The high percentage of calcareous porcellaneous taxa and the absence of planktonic foraminifera indicate that the Dam Formation was deposited in a restricted carbonate platform environment, very shallow hypersaline lagoon, gently sloping ramp (inner ramp) which ranges from supratidal to subtidal with local patch reefs towards the basin, and deposited in an arid subtropical environment with water temperature ranging between 20 and 35° C. Based on the observed assemblage composition, the present day Arabian Gulf can considered as modern analogue for the Miocene Dam Formation. The present day environment has not changed drastically since the Miocene