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Search Results: 1 - 10 of 9477 matches for " Ahmed Mousa "
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Acquisition of the Inter-Dental Fricatives /θ/ and /ð/ in ESL/EFL and Jamaican Creole: A Comparative Study  [PDF]
Ahmed Mousa
Open Journal of Modern Linguistics (OJML) , 2014, DOI: 10.4236/ojml.2014.41004
Abstract:

This study aims at investigating to what extent the linguistic processes exhibited in creolization parallel those manifested by Arab learners of English in particular and those of child language and second/foreign language in general. Another aim of the study is to highlight the link between second/foreign language learning and historical change. To this end, the speech of two speakers of the Broad Jamaican Creole was compared with the performance of Saudi school and university learners of English as a foreign language and data from child language, with respect to the pronunciation of English inter-dental fricatives /θ/ and /e/. The results show that learning in the above three situations takes place according to the same principles. Furthermore, the sound substitutions made in the three situations (i.e. [t], [d] respectively) are the same as those witnessed in historical sound change.

Acquisition of the Alveo-Palatal Fricative /ʒ/ in L2 English and Jamaican Creole: A Comparative Study  [PDF]
Ahmed Mousa
Open Journal of Modern Linguistics (OJML) , 2015, DOI: 10.4236/ojml.2015.53020
Abstract: This study investigates the claim that the strategies employed by second/foreign language learners are the same as those used by speakers of Creole languages. The speech of two speakers of the well-known Broad Jamaican Creole is checked against the performance of Saudi learners of English, focusing on the production of the voiced alveo-palatal fricative/?/. The findings suggest that the speakers in the two groups produce the voiced affricate/d?/ instead, suggesting perhaps that the above claim is valid. This study provides external evidence to the validity of such theories as sound substitution, markedness, and historical sound change which are said to shape early language acquisition, including child language.
Vibration and Buckling Approximation of an Axially Loaded Cylindrical Shell with a Three Lobed Cross Section Having Varying Thickness  [PDF]
Mousa Khalifa Ahmed
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.23039
Abstract: On the basis of the thin-shell theory and on the use of the transfer matrix approach, this paper presents the vibrational response and buckling analysis of three-lobed cross-section cylindrical shells, with circumferentially varying thickness, subjected to uniform axial membrane loads. A Fourier approach is used to separate the variables, and the governing equations of the shell are formulated in terms of eight first-order differential equations in the circumferential coordinate, and by using the transfer matrix of the shell, these equations are written in a matrix differential equation. The transfer matrix is derived from the non-linear differential equations of the cylindrical shells with variable thickness by introducing the trigonometric series in the longitudinal direction and applying a numerical integration in the circumferential direction. The natural frequencies and critical loads beside the mode shapes are calculated numerically in terms of the transfer matrix elements for the symmetrical and antisymmetrical vibration modes. The influences of the thickness variation of cross- section and radius v
Elastic Buckling Behaviour of a Four-Lobed Cross Section Cylindrical Shell with Variable Thickness under Non-Uniform Axial Loads
Mousa Khalifa Ahmed
Mathematical Problems in Engineering , 2009, DOI: 10.1155/2009/829703
Abstract: The static buckling of a cylindrical shell of a four-lobed cross section of variable thickness subjected to non-uniform circumferentially compressive loads is investigated based on the thin-shell theory. Modal displacements of the shell can be described by trigonometric functions, and Fourier's approach is used to separate the variables. The governing equations of the shell are reduced to eight first-order differential equations with variable coefficients in the circumferential coordinate, and by using the transfer matrix of the shell, these equations can be written in a matrix differential equation. The transfer matrix is derived from the nonlinear differential equations of the cylindrical shells by introducing the trigonometric series in the longitudinal direction and applying a numerical integration in the circumferential direction. The transfer matrix approach is used to get the critical buckling loads and the buckling deformations for symmetrical and antisymmetrical shells. Computed results indicate the sensitivity of the critical loads and corresponding buckling modes to the thickness variation of cross section and the radius variation at lobed corners of the shell.
Evaluation of Regular Multistory Buildings Using IBC2009 Code and ESEE Regulations by Pushover Analysis Method  [PDF]
Mohamed Sobaih, Ahmed Mousa
Open Journal of Civil Engineering (OJCE) , 2016, DOI: 10.4236/ojce.2016.64049
Abstract: For structural design and assessment of reinforced concrete members, the nonlinear analysis has become an important tool. The purpose of the pushover analysis is to assess the structural performance by estimating the strength and deformation capacities using static, nonlinear analysis and comparing these capacities with the demands at the corresponding performance levels. This paper aims to compare the results given by IBC2009 code and ESEE regulations. In this paper, four RC frames having 5, 15, 20 and 30 storeys were designed for seismicity according to both the recently adopted seismic code in Abu Dhabi (IBC2009) and the ESEE regulations. A pushover analysis is carried out for these buildings using SAP2000 (Ver. 15) and the ultimate capacities of the buildings are established. The obtained pushover curves and plastic hinges distributions are used to compare between the IBC2009 code and ESEE regulations. The comparison showed that there was variation in the obtained results by the two codes and the buildings designed by IBC2009 code were more vulnerable.
Evaluation of the Environmental, Social Effects for the Egyptian National Railways Restructuring  [PDF]
Mahmoud Ahmed Mousa Ali, Mohamed Abdelnaby El Sayed
Journal of Transportation Technologies (JTTs) , 2015, DOI: 10.4236/jtts.2015.51003
Abstract: This paper presents the main findings of the environmental and social impact assessment (ESIA) for the Egyptian national railways restructuring. This paper consists of the two parts: 1) modernizing the signaling system on the Arab El Raml-Alexandria Line and creating a Central Traffic Management Center in Tanta; and 2) renewing 200 km of track in Lower and Upper Egypt. The purpose of this evaluation is to identify and examine the potential socio-cultural, economic, and physical impacts of the railway restructuring, and propose measures to mitigate its adverse impacts, and develop plans for managing and monitoring the environmental aspects of the railway restructuring. This paper describes outlines of the environmental and social sensitivities of the railway restructuring area, potentially significant impacts of the proposed project and plans for their mitigation. Detailed information on the environmental and socio economic settings of the railway restructuring, components and activities of the proposed project and the results of the environmental and social impact assessment studies are presented in the body of the paper.
Visual function of Egyptian children with low vision and the demographic determinants
El Byoumi Boshra,Mousa Ahmed
Middle East African Journal of Ophthalmology , 2010,
Abstract: Aims: To determine whether the LV Prasad-Functional Vision Questionnaire (LVP-FVQ) could be used to assess self-reported visual function and quality of visual life in Egyptian school aged children. Materials and Methods: The LVP-FVQ was used to assess the quality of visual function in school-age children. All subjects were students at the time of assessment. Subjects underwent a visual function assessment that included distance and near visual acuity, contrast sensitivity, color vision and visual field examination where possible. Data analysis were for both descriptive and inference statistics. A P < 0.05 was considered statistically significant. Results: Fifty children aged 11.28 ± 3.5 years (range, 5 years to 18 years) with moderate-to-severe visual impairment most of their lives were enrolled. Twenty-two subjects (44%) had albinism, 18 (36%) subjects had hereditary retinal dystrophy, 6 (12%) subjects had cone dystrophy, 2 (4%) subjects had bilateral amblyopia and 2 (4%) subjects had congenital coloboma without other disabilities. The four most difficult tasks were related to the following daily activities alluded to in the questionnaire such as reading a textbook at arms length, copying from the blackboard, seeing somebody across the road and identifying colors. There was no statistically significant association between the demographic variables and the level of visual functioning, sex, age, type of school, family history or consanguinity (P > 0.05 for all variables). Conclusion: LVP-FVQ can be used to screen Egyptian children with visual impairment. Input and integration of the parents and the school teachers to evaluate the child s behavior at home and the school is essential to developing a balanced questionnaire.
Selective laser trabeculoplasty after canaloplasty improves the efficacy of intraocular pressure reduction in eyes with open angle glaucoma
Ahmed Elbably,Ahmed Mousa,Essam A. Osman
Saudi Medical Journal , 2013,
Abstract: [No available abstract]
Dimethylformamide Dimethyl Acetal (DMFDMA) in Heterocyclic Synthesis: Synthesis of Polysubstituted Pyridines, Pyrimidines, Pyridazine and Their Fused Derivatives  [PDF]
Fathi A. Abu-Shanab, Sayed A. S. Mousa, E. A. Eshak, Ahmed Z. Sayed, Ahmed Al-Harrasi
International Journal of Organic Chemistry (IJOC) , 2011, DOI: 10.4236/ijoc.2011.14030
Abstract: Reaction of N,N’-dimethylformamide dimethyl acetal (DMFDMA) with malononitrile dimer 8 (1:1) mole afforded 9 while, this reaction when carried out in (2:1) mole to give amidine 11 which can be used for the preparation of pyrimidine 13, amidine 14 and pyridine 19 when reacted with 4-nitroaniline, 4-methylaniline and alkoxide respectively. Malononitrile dimer reacted with diazonium chloride to give pyridazine 21, which can be reacted with DMFDMA, AcOH/HCl and cyanoacetamide to give pyridazine 22, 23 and pyrido[4,3-c] pyridazine 24 respectively. The latter reacted with DMFDMA to afford tricyclic compound 25.
Local Search-Inspired Rough Sets for Improving Multiobjective Evolutionary Algorithm  [PDF]
Ahmed A. EL-Sawy, Mohamed A. Hussein, El-Sayed Mohamed Zaki, Abd Allah A. Mousa
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.513192
Abstract:

In this paper we present a new optimization algorithm, and the proposed algorithm operates in two phases. In the first one, multiobjective version of genetic algorithm is used as search engine in order to generate approximate true Pareto front. This algorithm is based on concept of co-evolution and repair algorithm for handling nonlinear constraints. Also it maintains a finite-sized archive of non-dominated solutions which gets iteratively updated in the presence of new solutions based on the concept e-dominance. Then, in the second stage, rough set theory is adopted as local search engine in order to improve the spread of the solutions found so far. The results, provided by the proposed algorithm for benchmark problems, are promising when compared with exiting well-known algorithms. Also, our results suggest that our algorithm is better applicable for solving real-world application problems.

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