Djallel Boulmaiz, مريم بنصية

كلية الأداب واللغات-جامعة العربي بن مهيدي - أم البواقي · الجزائر

This work is concerned with EFL teachers' and students' perception of the effect of classroom interaction on enhancing learners' communicative competence. It is certain that the corner stone of language learning is to interact using that language appropriately. Consequently, classroom interaction is considered as an important aspect for EFL teachers and learners in language/learning process. This study aimed at testing one hypothesis which was formulated as follows: a successful classroom interaction has an effect on learners' communicative competence development. In the current study, a descriptive method was applied through two questionnaires. The first questionnaire was addressed to 40 third year LMD students from the department of English at l'Arbi Ben Mhidi University. The second one was administered to 10 teachers of oral expression at the same department. On the basis of the data collected from both questionnaires, our hypothesis was confirmed. Results showed that most teachers and learners believe that through classroom interaction, learners can enhance their communicative competence because both of them are aware of the importance of interaction inside the classroom.

منى مصطفى الشلقامي, وفاء محمد يوسف آل علي

كلية محمد بن راشد للإدارة الحكومية · الامارات

جازية بشارف, سمية بلعباس, محفوظ سعيداني

كلية العلوم الاجتماعية والإنسانية-جامعة الجيلالي بونعامة - خميس مليانة · الجزائر

أمـين حـواس , نصر الدين عشوي

كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة عبد الحميد بن باديس مستغانم · الجزائر

Muhammad Irfan, Magdi El-Emam

كلية الهندسة-الجامعة الأمريكية - الشارقة · الامارات

United Arab Emirates (UAE) has experienced significant economic growth in recent years. The accelerated schedule driven projects are compelling designers to use values of seismic hazard (ground motion) that are either significantly conservative or unreliable. Moreover, not all estimates of a seismic hazard analysis such as mapped spectral accelerations, representative hazard spectra, and deaggregation covering all parts of UAE are available. Studies that have attempted to define the seismic hazard in UAE in the past are not in agreement and they either focused on few cities or did not provide all the necessary information. The variations in their results could be attributed to the use of questionable source zonation, activity parameters, and superseded prediction equations. Consequently, designers in UAE have to rely on inaccurate estimate of seismic hazard for the region. Considering substantial development in United Arab Emirates (UAE) and considerable ambiguity faced by the designers in choosing the seismic hazard from disagreeing studies, a new seismic hazard analysis is urgently required. This study is based on the use of homogenized catalogue of various degrees of completeness for temporal distribution of events (Surface magnitudes, Ms), activity parameters based on doubly bounded magnitude-frequency relationships, modified zonation of area sources, and new generation prediction equations. The study aims to provide a comprehensive seismic hazard assessment for all parts of UAE that will provide designers with Hazard curves, values of peak ground accelerations (PGA), mapped spectral accelerations at 0.2s and 1s (S0.2 and S1), Uniform Hazard Spectra (UHS), and deaggregation of seismic hazard. In addition to the estimation of seismic hazard, this study provides estimates of the site amplification for three major cities of UAE (Sharjah, Dubai, and Abu Dhabi). Effect of local site conditions in modifying the seismic waves is well documented in many studies. Site amplification factors as a guideline for typical UAE building sites are not available. As a result, designers in UAE have to rely on factors developed for other regions. These factors are typically obtained by performing equivalent-linear or non-linear site response analysis of sites of known dynamic properties. Site response analyses were performed for different representative subsurface soil models obtained from various sources. Sites were grouped as per the provisions of International Building Code (IBC 2009). The results of this part of the study will provide structural engineers with region specific amplification factors for the development of design spectra instead of relying on factors developed for other regions. The results are generally provided for a return period of 2475 years (2 % probability of excedance in 50 years) in conformance to the provisions given in American codes. The results mapped seismic hazard presented in this study corresponds to rock sites classified as Site Class B according to International Building Code (IBC 2009). The results indicate slightly larger values of seismic hazard compared to some recently published studies. The effect of west coast fault is significant especially at larger return periods and should be taken into account if future studies confirm the presence of a fault along the west coast of UAE and prevalent building codes adopts lower probability of exeedance. The activity in Arabian Craton (background seismicity) contributes mostly to the hazard in most southern part of UAE. The contribution of other sources such as Zargos (Iran) and Oman mountains increases as one move towards the North. The west of the country is dominated by seismicity from Zargos whereas the east by seismicity from Oman mountains. The results of site response analyses (site classes C and D) suggest more amplification in Sharjah than in Dubai and Abu Dhabi because of deep engineering bedrocks in Sharjah. The response spectra of Abu Dhabi and Dubai are scattered as compared to Sharjah because of the variance in soil column depths in Dubai and Abu Dhabi. The amplification factors for Sharjah are in the range of 4 to 6 and for Dubai it is estimated to be around 3 to 4; whereas, the amplification factors for Abu Dhabi ranged from 4 to 8.

علاء الدين عبدوني, عيسى شاغة, كريم شرقي

كلية الاداب واللغات-جامعة اكلى محند أولحاج - البويرة · الجزائر

Ghassan Antar, Lamiss Dawood Zaidouny

كلية العلوم والأداب-الجامعة الأمريكية في بيروت · لبنان

A fluid experiment is made to study the dynamics of liquid gallium in a cylindrical container of 10 cm radius. A 2 cm layer of gallium is subject to an axial magnetic field which reaches 0.1 T at the center. At the edges of the container 36 electrodes are

.Amin M. B , عدنان بن عبد العزيز بن محمد صديق قطب

كلية علوم وهندسة الحاسب الآلي-جامعة الملك فهد للبترول والمعادن · السعودية

Data security is an important aspect of information transmission and storage in an electronic form. Cryptographic systems are used to encrypt such information to guarantee its security. To retrieve such information, the encrypted form must be first decrypted. One of the most popular cryptographic systems is the RSA system. The security of the RSA-encrypted information largely depends on the size of the used encryption key. The larger the key size is the longer the encryption/decryption time will be. To cope with the continuous demand for larger key sizes, faster hardware implementations of the RSA algorithm has become an active area of research. One disadvantage of hardware implementations is their fixed key sizes. If the key size is to be increased, the hardware design should be fully replaced. The work reported here proposes an RSA hardware implementation that can be expanded as the key size gets larger. This implementation is modeled using VHDL in a parametrizable manner. Two other parameterized RSA hardware designs have also been VHDL modeled for comparison. The three models are compared for a 1024-bit key size and the results are analyzed. The complexity of the designs are compared and conclusions regarding optimal delay and area parameters are made.

كنز علي, ماهر مصطفي

كلية الهندسة المدنية-جامعة دمشق · سوريا

خليل البياتي, علياء موسى, محمد أحمد صالح

كلية العلوم-جامعة النهرين · العراق