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Search Results: 1 - 10 of 462212 matches for " Hamdy A. Abdelaziz "
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Immersive Learning Design (ILD): A New Model to Assure the Quality of Learning through Flipped Classrooms  [PDF]
Hamdy A. Abdelaziz
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.211027
Abstract: The objective of this paper was to develop an immersive Web-based learning model to assure the quality of learning through the flipped classrooms. The proposed model was guided theoretically by the flipped classroom as a new Web-based learning trend/system. It was also guided pedagogically by active and reflective learning principles that support transforming of the teaching and learning practices from content engagement to cognitive engagement. The targeted immersive learning model encompasses four reciprocal phases: Pro-act, Act, Reflect, and Re-act (PARR). To validate the suggested model, a convenience sample of graduate students studying an advanced statistics course was selected from the Distance Teaching and Training Program at Arabian Gulf University. After designing and applying this new immersive Web-based learning model (PARR), findings revealed that using the flipped classroom through this immersive Web-based learning model has a statistical and practical impact on developing achievement and self-study skills among graduate students. The contribution of this research is that it qualifies the Web-based instructional practices to shift from content acquisition act to knowledge expression and creation act. In addition, the paper will be of benefit to people looking for pedagogical applications of virtual and blended learning environments for developing multiple ways to express what learners know and be able to do.
D4 S4: A Four Dimensions Instructional Strategy for Web-based and Blended Learning
The Turkish Online Journal of Distance Education , 2012,
Abstract: Web-based education is facing a paradigm shift under the rapid development of information and communication technology. The new paradigm of learning requires special techniques of course design, special instructional models, and special methods of evaluation. This paper investigates the effectiveness of an adaptive instructional strategy for teaching and learning through the Web and blended learning environments. The central theme of this strategy is that instructional strategies give instructors and students a conceptual as well as a practical mode of delivery from which to teach and learn. Considering and applying new instructional strategy can help instructors to understand the uses of pedagogical content knowledge, as well as to reflect the role of technological content knowledge that can be adapted and/or adopted in teaching in all educational levels and environments. The main objective of this paper was to develop a holonomic instructional strategy for Web-based and blended learning. This strategy is guided by the non-linear and interactive features of learning environments. The strategy is consisted of four dimensions: designing, developing, delving and distributing. In this new instructional strategy, learning is holonomic and adaptive. Learning occurs in an open learning environment, in which instructors are designing a shared vision, developing a sharable e-learning task, delving students’ learning through scaffolding and salvaging students’ knowledge. The expected outcome of this instructional strategy is that each learner will develop a cognitive schema to be used to organize and construct knowledge and meaning in similar context of learning which may increase the generalizability, trustworthiness and transferability of learning. The results of applying this new strategy showed that this strategy is effective on developing both achievement and deep learning levels among a sample of graduate students.
Evaluation of Bilateral Mental Nerve Block as an Alternative to General Anesthesia for Resection of Lower Lip Tumors  [PDF]
Ashraf Khater, Islam A. Elzahaby, Mohamed Hamdy, Mohammad Zuhdy, Omar Hamdy, Mohamed Ezzat, Mahmoud Abdelaziz, Ahmad M. Farid, Mansour Elmoatasem, Amr Hassan, Khalid Atallah, Mahmoud Mostafa Saleh, Maha A. Abo-Zeid, Amr Yassin, Ola Taha Abd Eldayem, Mona Gad
Surgical Science (SS) , 2017, DOI: 10.4236/ss.2017.88035
Abstract: Objective: Nerve blockade is commonly used in oncosurgical procedures as an alternative to general anesthesia for older patients and those with significant medical problems. We report a single tertiary oncology center experience in performing various lip resections and reconstructive techniques using this technique. Patients and methods: sixty patients with lower lip tumors were enrolled into this study with exclusion of refusing, non-compliant and critically ill patients. A solution of 4 ml 2% Lidocaine and epinephrine was put in a 5 ml syringe. Half the solution (2 ml) was injected into each side with a 23 gauge needle and after 5 minutes the surgical resection was carried out after testing for anesthesia. Results: The mean age was 68 ± 6.2 years. The mean ASA score was 3 ± 0.75. There were 4 cases who expressed painful sensation and their operations were completed with fentanyl increments. Mean hospital stay was 1 ± 0.75 days. There were three cases of wound gaping who were treated with secondary closure in an outpatient basis. One patient expressed postoperative acute ischemic heart pain that was managed with anti-ischemic measurements. Conclusion: Bilateral mental nerve block is a safe and effective alternative to general anesthesia in lower lip tumors’ resection especially in older patients and those with poor tolerance for general anesthesia provided that there is no need for cervical nodal dissection.
Anti-CD-20 Therapy in Refractory Adult Still’s Disease  [PDF]
Reem Hamdy A. Mohammed
Open Journal of Rheumatology and Autoimmune Diseases (OJRA) , 2012, DOI: 10.4236/ojra.2012.22002
Abstract: Adult Still’s disease is a relatively rare form of rheumatoid arthritis with systemic inflammatory features. The prevalence is around 1.5 cases per 100,000 - 1000,000. In the current case we display a 30-year-old male patient with refractory adult still’s disease who suffered recurrent attacks of fever 39.5°C, arthritis in proximal interphalangeal joints (PIPs), wrists, tempromandibular joints (TMJs), knees and ankles, stitching chest pain, dyspnea, erythematous rash over the trunk, sore throat, weight loss (15 Kilograms in 4 months). The patients’ disease remained uncontrolled despite of synthetic disease modifying anti-rheumatic drugs and repeated intramuscular corticosteroid injections. Laboratory workup revealed erythrocyte sedimentation rate (ESR) of 95, C-reactive protein (CRP) of 100 mg/L, hemoglobin 10.5 gm%, leukocytosis 12,000/microlitre, mild elevation of liver function tests and dyslipidemia. Serology revealed negative rheumatoid factor, anti-nuclear antibody titre of 1:80, elevated serum ferritin 4000 micrograms/litre. The patient was started on rituximab (375 mg/m2), prednisolone 20 mg/day and selective Cox-2 inhibitor. Follow up for over three months following the completion of his pulse therapy, revealed no relapse of fever or fatigue, with morning stiffness of 5 - 10 minutes, VAS of 3, DAS28 of 3.8, HAQDI of 0.62, ESR 23, CRP 4.9, Hb 12.5 gm%, leucocytic count 9000/microlitre, the dose of prednisolone was successfully reduced to a dose of 5 mg/day orally. Conclusion: Anti-CD20 therapy successfully controlled systemic and articular refractory disease with sustained efficacy over a follow up period of up to 24 weeks.
Seismicity and Geologic Structures Indubitable in Wadi Hagul, North Eastern Desert, Egypt  [PDF]
Tarek A. Seleem, Hamdy A. Aboulela
International Journal of Geosciences (IJG) , 2011, DOI: 10.4236/ijg.2011.21006
Abstract: Paleo and recent earthquakes have been recorded in Wadi Hagul area and its environs, which have left behind geologic structures of deformation preserved in exposed sedimentary rocks. To evaluate such deformation and surface break, different techniques and data types are used compromising image processing techniques, Geographic Information Systems (GIS), seismicity data, as well as, field investigation. The field investigation clarified that the study area is enriched with soft-sediment deformation structures encompassing two types of geologic structures; brittle and viscoplastic structures. The analysis of the various types of data elucidate that, the earthquakes of Wadi Hagul are frequently distributed at an average depth ranging from (1 to 35 km) within the top of the Earth’s crust which are mainly controlled by existing Hagul fault zone. The study gives new insight for a better understanding of the seismic activity in the study area which helps in the seismic hazard assessment
Vibration of Nano Beam Induced by Ramp Type Heating  [PDF]
Hamdy M. Youssef, Khaled A. Elsibai
World Journal of Nano Science and Engineering (WJNSE) , 2011, DOI: 10.4236/wjnse.2011.12006
Abstract: The non-Fourier effect in heat conduction and the coupling effect between temperature and strain rate, became the most significant effects in the nano-scale beam. In the present study, a generalized solution for the generalized thermoelastic vibration of a bounded nano-beam resonator induced by ramp type of heating is developed and the solutions take into account the above two effects. The Laplace transforms and direct method are used to determine the lateral vibration, the temperature, the displacement, the stress and the energy of the beam. The effects of the relaxation time and the ramping time parameters have been studied with some comparisons.
Extended Finite Element Modeling: Basic Review and Programming  [PDF]
Yazid Abdelaziz, K. Bendahane, A. Baraka
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.37085
Abstract: In this work, we have exposed a recent method for modeling crack growth without re-meshing. The main advantage of this method is its capability in modeling discontinuities independently, so the mesh is prepared without any considering the existence of discontinuities. The paper covers the formulation and implementation of XFEM, and discusses various aspects of the approach (enrichments functions, level set representation, numerical integration…). Numerical experiments show the effectiveness and robustness of the XFEM implementation.
Fractional Order Generalized Thermoelastic Infinite Medium with Cylindrical Cavity Subjected to Harmonically Varying Heat  [PDF]
Hamdy M. Youssef, Eman A. Al-Lehaibi
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.31004
Abstract: In this work, a mathematical model of an elastic material with cylindrical cavity will be constructed. The governing equations will be taken into the context of the fractional order generalized thermoelasticity theory (Youssef 2010). Laplace transform and direct approach will be used to obtain the solution when the boundary of the cavity is exposed to harmonically heat with constant angular frequency of thermal vibration. The inverse of Laplace transforms will be computed numerically using a method based on Fourier expansion techniques. Some comparisons have been shown in figures to present the effect of the fractional order parameter and the angular frequency of thermal vibration on all the studied felids.
Environmental and Mineralogical Studies of the Sabkhas Soil at Ismailia—Suez Roadbed, Southern of Suez Canal District, Egypt  [PDF]
Mohamed M. El-Omla, Hamdy A. Aboulela
Open Journal of Geology (OJG) , 2012, DOI: 10.4236/ojg.2012.23017
Abstract: Eight surface sabkha soils samples were collected from Ismailia—Suez roadbed, southwestern of Suez Canal district. Sedimentological and mineralogical analyses were conducted using grain size; X-ray diffraction and Scanning Electron Microscopy (SEM). Grain size analysis indicates high contents of fine sand and mud as well as presence of salts. X-ray diffraction; Scanning Electron Microscopy (SEM) and EDAX tool clarified that the sabkha soils are enriched by quartz, sulfate minerals (gypsum, anhydrite), carbonate minerals (calcite-dolomite-aragonite), chlorides (halite and bischofite), and clay minerals. The results elucidate that the appearance of sabkha deposits and their distribution in the study area are controlled mainly by the content of water soluble salts through parent materials; ground water table; subsurface structural; and physiographic features for instance surface relief or topography; and human activity.
Free Residual Chlorine Calibration by WaterCAD at El-Nozha Water Network in Alexandria Governorate, Egypt  [PDF]
Diaa Hamdy, Medhat A. E. Moustafa, Walid Elbakri
Journal of Environmental Protection (JEP) , 2014, DOI: 10.4236/jep.2014.510087

Most of developing countries suffer from decreasing and poor quality of drinking water which led to emergence of many dangerous diseases. In addition, there isn’t any methodology followed to predict and disinfect drinking water by using advanced software program. Maintaining water quality in the water distribution system has become a prominent issue in the study of the water network. Residual chlorine concentration is the indicator to ensure the quality of water in the water network because it eliminates contaminants in the distribution network beginning of the treatment plant down to the consumer. In collaboration with Alexandria (Egypt) Water Company, samples were taken from El-NOZHA water plant station and El-HADARA water distribution network to know the free residual chlorine. In this paper, WaterCAD software has been used to make hydraulic analysis and calibration of residual chlorine in water distribution network to know the ideal chlorine dose that should be added at the water treatment plant and to know the areas of strength and weakness in the concentration of free residual chlorine in the water distribution network. In addition different scenarios have been found to know the free residual chlorine at the weakness areas after injecting chlorine in some junctions and the impact of a fire case or breaking in the water pipe distribution network on the residual chlorine. Results showed ensuring in the water quality in the distribution network by adding chlorine dose in water less than the existing dose which has been added in the El-NOZHA water treatment plant. It is possible to maintain the percentage of free residual chlorine concentration at different locations without relying on adding chlorine only in water treatment plant by injecting low percentage of chlorine dose in the junctions.

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