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Search Results: 1 - 10 of 10576 matches for " Saleh Ahmed Saleh "
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Synthesis and Characterization of Sb65Se35-xGex Alloys  [PDF]
Saleh Ahmed Saleh
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.27127
Abstract: Density, chemical, structural and vibrational studies of Sb65Se35-xGex system with 0 ≤ x ≤ 20 produce by melt-quench technique were carried out using Archimedes method, Energy Dispersive Spectroscopy (EDS), X-ray diffraction (XRD) and Raman spectroscopy. All specimens are polycrystalline in nature as confirmed by XRD pattern. The compositional dependence of the XRD and Raman spectra suggests the presence of two basic structural units, SbSe3 pyramids with three-fold coordinated Sb atom at the apex and GeSe4 tetrahedrons. The compositional dependence of these physic Chemical properties of the investigated samples are investigated and discussed in light of many models. PACS: 68.55. Ln; 61.50. Ks; 68.55.Jk
A Green Microwave-Assisted Synthesis of New Pyridazinium-Based Ionic Liquids as an Environmentally Friendly Alternative  [PDF]
Mouslim Messali, Saleh A. Ahmed
Green and Sustainable Chemistry (GSC) , 2011, DOI: 10.4236/gsc.2011.13012
Abstract: A green microwave-assisted procedure for the preparation of a series of fifteen new N-alkylpyridazinium ionic liquids with different functionality in the alkyl chain is described. For the first time, target ionic liquids were prepared using standard methodology and under microwave irradiation in short duration of time with quantitative yields. In most cases, the microwave-assisted reaction is an environmentally friendly alternative to traditional methods.
A Monograph on: Educational Linguistics, its Origin, Definitions and Issues it Accounts for
Ahmed Mohammed Saleh Alduais
International Journal of Education , 2012, DOI: 10.5296/ije.v4i4.2437
Abstract: Purpose: To present argumentatively Spolsky’s proposed idea of exempting the field of applied linguistics from his proposed field educational linguistics and Hult’s view that only the history of educational linguistics can be inextricably linked to applied linguistics. Method: Accounting for the history of educational linguistics in terms of its origin, definitions, and issues it accounts for. Besides, the author presents his own proposed models for the field of educational linguistics to be discussed against those models proposed by Spolsky (the father of educational linguistics). Results and conclusions: Whether applied linguistics and educational linguistics are the same remains a controversial issue, but it is very clear that applied linguistics could include educational linguistics but not vice versa.
Large-scale Classification of Fine-Art Paintings: Learning The Right Metric on The Right Feature
Babak Saleh,Ahmed Elgammal
Computer Science , 2015,
Abstract: In the past few years, the number of fine-art collections that are digitized and publicly available has been growing rapidly. With the availability of such large collections of digitized artworks comes the need to develop multimedia systems to archive and retrieve this pool of data. Measuring the visual similarity between artistic items is an essential step for such multimedia systems, which can benefit more high-level multimedia tasks. In order to model this similarity between paintings, we should extract the appropriate visual features for paintings and find out the best approach to learn the similarity metric based on these features. We investigate a comprehensive list of visual features and metric learning approaches to learn an optimized similarity measure between paintings. We develop a machine that is able to make aesthetic-related semantic-level judgments, such as predicting a painting's style, genre, and artist, as well as providing similarity measures optimized based on the knowledge available in the domain of art historical interpretation. Our experiments show the value of using this similarity measure for the aforementioned prediction tasks.
Quantifying Creativity in Art Networks
Ahmed Elgammal,Babak Saleh
Computer Science , 2015,
Abstract: Can we develop a computer algorithm that assesses the creativity of a painting given its context within art history? This paper proposes a novel computational framework for assessing the creativity of creative products, such as paintings, sculptures, poetry, etc. We use the most common definition of creativity, which emphasizes the originality of the product and its influential value. The proposed computational framework is based on constructing a network between creative products and using this network to infer about the originality and influence of its nodes. Through a series of transformations, we construct a Creativity Implication Network. We show that inference about creativity in this network reduces to a variant of network centrality problems which can be solved efficiently. We apply the proposed framework to the task of quantifying creativity of paintings (and sculptures). We experimented on two datasets with over 62K paintings to illustrate the behavior of the proposed framework. We also propose a methodology for quantitatively validating the results of the proposed algorithm, which we call the "time machine experiment".
An Investigation into Substation Grounding and Its Implementation on Gaza Substation  [PDF]
Ahmed Hammuda, Hassan Nouri, Mohammed Saleh Al-Ayoubi
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.35074
Abstract: An investigation into the optimal design of a substation grounding system for the transmission substation in Gaza City, Palestine has been carried out. A research into the most influential parameters on the effectiveness of the substation grid system has been performed and its results have been incorporated into the Gaza case study. Through modelling and simulating the power station in Gaza while considering some field data, an optimal substation grounding grid has been designed and has shown complete conformance to safety. It is thus considered that such a design will protect personnel in any area of the substation in addition to the installed machinery if the largest possible fault current was to traverse the earth.
A Rough Set and GIS Based Approach for Selecting Suitable Shelters during an Evacuation Process  [PDF]
Sara S. Elheishy, Ahmed A. Saleh, Aziza Asem
Journal of Geographic Information System (JGIS) , 2013, DOI: 10.4236/jgis.2013.51001

Humanity suffers an ever-present threat of crises. In the event of a crisis, the population in affected areas will be in danger and will need to be evacuated to a safer in order to protect their lives. One of the difficulties in emergency management is quickly and accurately selecting suitably safe areas of refuge. This paper aims to explain an evacuation shelter selection process that uses rough set theory and a geographical information system (GIS). The proposed approach uses rough set theory concepts to classify shelters and selects suitable shelters on the basis of three factors: distance, capacity, and the availability of life requirements. The preparation of data and reporting of results are performed via the GIS environment. The proposed approach was implemented using Masoura,Egypt, as a case study and the re- sults of this implementation are presented.

Transformation Formulas for the First Kind of Lauricella’s Function of Several Variables  [PDF]
Fadhle B. F. Mohsen, Ahmed Ali Atash, Hussein Saleh Bellehaj
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.46115
Abstract: Very recently Atash and Al-Gonah [1] derived two extension formulas for Lauricella’s function of the second kind of several variables \"\"and \"\". Now in this research paper we derive two families of transformation formulas for the first kind of Lauricella’s function of several variables \"\" and \"\" with the help of generalized Dixon’s theorem on the sum of the series \"\" obtained earlier by Lavoie et al. [2]. Some new and known results are also deduced as applications of our main formulas.
Practical Study for the Effect of Speed, Direction of Acceleration and Type of Machine on Vibrations Transferred to the Steering Wheel Horticulture Tractor Type (Goldoni)  [PDF]
Ghazwan Ahmed Dahham, Saad Tawfik Muhamed, Shamel Mohammed Saleh
Engineering (ENG) , 2019, DOI: 10.4236/eng.2019.111005
Abstract: Field an experiment was carried out in the farms of Agriculture and forestry academy at University in Nineveh. The research was conducted to investigate a practical study for the effect of four forward speeds (1.9, 2.6, 3.8 and 4.7 km/hr.) and three acceleration direction of axes lateral, longitudinal and vertical, and two types machines control (Mower and Rotovators) on the vibrations transferred to the steering wheel horticulture tractor type (Goldoni). The vibration points on the handgrip were calculated and tested. Root mean square acceleration (RMS), given in m/sec2, was calculated. Results showed increased acceleration vibration of the three directions (longitudinal, lateral and vertical) transferred to the steering wheel tractor by increased forward speed. The Mower score recorded the highest acceleration vibration for the three directions of Rotovators. The levels of vibration emitted from tractor to hand an operator during the experiment was high comparing with standard mechanical vibration. Handgrip vibration intensity in the vertical direction is bigger than the lateral and longitudinal direction. The total vibration evaluating was denoted as the square root mean of the three sum value (lateral, longitudinal and vertical) directions. The paper purpose was measuring and analyzing vibration level transferred to the steering wheel and reduces the machine vibration. This paper is helpful for design in order to increase the develop safety systems in easy and economical way.
Photochromism of Dihydroindolizines Part XI: Synthesis of Novel Carbon-Rich Photochromic Dihydroindolizines-Based Potential Electronic Devices
Saleh Abdel-Mgeed Ahmed
Organic Chemistry International , 2008, DOI: 10.1155/2008/959372
Abstract: Novel carbon-rich photochromic dihydroindolizine (DHI) derivatives substituted in the fluorene part (region A) in addition to the new spirocyclopropene 6 have been synthesized. The synthesis of dimethyl 2,7-diethynylspiro[cycloprop[2]ene-1,9-fluorene]-2,3-dicarboxylate precursor 6 was accomplished in five steps, starting with the literature known conversion of fluorene to 2,7-dibromo-9H-fluoren-9-one in 56% yield over three steps. The chemical structures of the new synthesized materials have been elucidated by both analytical and spectroscopic tools. Three alterative synthetic pathways for the synthesis of DHI 9 have been established.
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