Al-Ittijāhāt al-dīnīyah wa-al-siyāsīyah fī shiʿr Aḥmad Shawqī = الاتجاهات الدينية والسياسية في شعر أحمد شوقي

[abstract not provided

Simulation expérimentale de l'altération des pierres par cyclage.

Cette communication présente les résultats d'un essai de vieillissement basé sur des cycles d'imbibition-séchage sur une pierre régionale : le tuffeau. Une cinquantaine de cycles qui ont duré trois ans ont été appliqués sur une face d'un échantillon cylindrique. Les mouvements d'eau semblent induire des modifications texturale et minéralogique dues aux phénomènes de dissolution des minéraux, de transport des sels et de recristallisation. Ceci provoque le ralentissement de l'imbibition et témoigne de l'altération de l‘échantillon de la pierre testée. De plus, le test d'imbibition permet de montrer la présence de deux zones d‘altération distinctes, notamment une patine sur la face cyclée, zone moins poreuse que dans le reste de l'échantillon

Caractéristiques d'un mortier à base de chaux et de poudre de roche pour la restauration des monuments.

Meknès - MarocCette communication présente les caractéristiques hydriques et mécaniques d'un mortier à base de chaux hydraulique et de poudre de tuffeau (pierre calcaire employée dans la construction des châteaux dans le Val de Loire – France). Les différents tests mécaniques et hydriques sur les échantillons de mortier confectionnés avec différents pourcentages de chaux hydraulique ont pour objectif de déterminer le mortier compatible avec le tuffeau

Physical-mechanical characterization of hydraulic and non-hydraulic lime based mortars for a French porous limestone

The focus of the study presented in this paper is to provide reliable criteria that can be used to estimate the degree of compatibility between the French limestone tuffeau and mortar. It is suggested through this study to use the same parent material (i.e., tuffeau) as mortar. The mortar used in this study is composed of non-hydraulic (hydrated) lime or hydraulic lime and aggregates obtained from fragments and powder of the tuffeau stone. Water transfer properties and mechanical behaviour of the mortars are evaluated and compared with the original stone Tuffeau. Based on these studies, some key guidelines are provided such that a mortar that is compatible with properties of Tuffeau and can be prepared and used as construction material of monuments and maintenance purposes.Comment: Madrid - Espagn

Enhancing Data Security in Cloud Computing: A Comparative Analysis of Encryption Techniques

This research presents a novel and efficient public key cryptosystem known as the Enhanced Schmidt Samoa (ESS) cryptosystem, proposed to safeguard the data of a single owner in cloud computing environments. Data storage is a one-time process in the cloud, while data retrieval is a frequent operation. Experimental results demonstrate that the ESS cryptosystem offers robust data confidentiality in the cloud, surpassing the security provided by traditional cryptosystems. The research also introduces a secure cloud framework designed to accommodate both individuals and organizations accessing applications and data in the cloud. While individual users may generate and share data, organizations often involve multiple users in data sharing to support their business processes. In these scenarios, multi-user data ownership and access management become critical, requiring secure sharing of cryptographic keys among the authorized users. To address these issues and ensure data confidentiality in multi-user cloud environments, the Improved Secure Cloud Data Storage Framework (ISCDSF) is introduced. This research not only enhances data security but also provides a comprehensive framework for secure data sharing in the cloud, catering to the needs of both individual users and organizations

Community detection of political blogs network based on structure-attribute graph clustering model

Complex networks provide means to represent different kinds of networks with multiple features. Most biological, sensor and social networks can be represented as a graph depending on the pattern of connections among their elements. The goal of the graph clustering is to divide a large graph into many clusters based on various similarity criteria’s. Political blogs as standard social dataset network, in which it can be considered as blog-blog connection, where each node has political learning beside other attributes. The main objective of work is to introduce a graph clustering method in social network analysis. The proposed Structure-Attribute Similarity (SAS-Cluster) able to detect structures of community, based on nodes similarities. The method combines topological structure with multiple characteristics of nodes, to earn the ultimate similarity. The proposed method is evaluated using well-known evaluation measures, Density, and Entropy. Finally, the presented method was compared with the state-of-art comparative method, and the results show that the proposed method is superior to the comparative method according to the evaluations measures

Real-Time Face Recognition System Using KPCA, LBP and Support Vector Machine

With increasing security threats, Biometric systems have importance in different fields. This appears clearly exactly after the rapid development that happened in power of computing. In this paper, the Design and implementation of a real-time face recognition system are presented. In such a system, Kernel principal component analysis (KPCA) and Local binary pattern (LBP) are used as feature extraction methods with the aid of support vector machine (SVM) to work as a classifier. A comparison between traditional feature extraction methods as (PCA and LDA) and a proposal methods are performed as well as a comparison between support vector neural network and artificial neural network classifier are also implemented. Two types of experiments, On-line, and Off-line experiments are done. In the On-line experiment, a new database is created and used. While in the off-line experiment, two types of databases (ORL and YALE) are used to estimate the performance and efficiency of the system. The combinations of these methods together enhances the experimental results in compare with other methods