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Search Results: 1 - 10 of 32442 matches for " Said Ali El- Quliti "
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Estimating the Frequency, Magnitude and Recurrence of Extreme Earthquakes in Gulf of Aqaba, Northern Red Sea  [PDF]
Ali Hassan Baaqeel, Said Ali El- Quliti, Yahya Ali Daghreri, Sultan Abdullah Bin Hajlaa, Hadi Hussain Al- Yami
Open Journal of Earthquake Research (OJER) , 2016, DOI: 10.4236/ojer.2016.52011
Abstract: Humans coexist with extreme events all the time, only when the intensity of the event becomes greater than a certain level there is a resulting disaster. Small earthquakes occur all of the time with no adverse effects. Only large earthquakes cause disasters. Statistical analysis reveals that larger events occur less frequently than small events. In a year, we would have many values for the events; the annual maximum was the greatest of those values. Within an annual series, only the largest value per year is allowed, even if an additional significant peak occurs. As the magnitude of a hazardous increases, the frequency of occurrence (how often a given magnitude is equaled or exceeded) decreases. Thus, major disasters result from a small number of large events that rarely occur. A plot of recurrence intervals versus associated magnitudes produces a group of points that also approximates a straight line on semi-logarithmic paper. Therefore, past records of earthquakes at the Gulf of Aqaba, Northern Red Sea for months from May, 1999 to Feb, 2016 are used to predict future conditions concerning the annual frequency, the return period, the percentage probability for each event, and the probability of a certain-magnitude earthquake occurring in the region during any period.
Assessment of Main Parameters of Extreme Earthquakes in Red Sea, West Coast of Saudi Arabia  [PDF]
Said Ali El- Quliti, Tawfiq Bin Saeed Al- Harbi, Mahdi Bin Salem Al- Yami, Ahmed Bin Matar Al- Ghamdi, Mohammed Bin Mattar Al- Shammari
Open Journal of Earthquake Research (OJER) , 2016, DOI: 10.4236/ojer.2016.52010
Abstract: The negative effects of natural disasters on human life exist from the foot and did not occur at a specific time but found since the creation of mankind. Humans coexist with extreme events all the time, only when the intensity of the event becomes greater than a certain level there is a resulting disaster. Small earthquakes occur all of the time with no adverse effects. Only large earthquakes cause disasters. Statistical analysis reveals that larger events occur less frequently than small events. Through the large number of seismic events, we find that at the end of the year may have a series of seismic events with different values depending on the strength of activity whether it is high or low on Richter scale and the assessment is only for the greatest value in a year even if recurring this value and the volume of dangerous increases and the frequency of their occurrence according to an ongoing activity, major disasters result from a small number of events and sustained results in a large and devastating event, and can be represented by these results and amounts On a log-scale which points are almost on a straight line and a clear indication of the evaluation event. Through previous data analysis we can understand the following events behavior for coordination and guidance on the development of evacuation plans on the expected future and use a Weibull equation to estimate the frequency of the event and the return again as a percentage for each event and the probability of the occurrence of a particular earthquake to some degree on the Richter scale in the sea during any period. Past records of earthquakes at the West Coast of the Kingdom of Saudi Arabia (Red Sea) for years 1913-2016 are used to predict future conditions concerning the annual frequency, the return period, the percentage probability for each event, and the probability of a certain-magnitude earthquake occurring in the region during any period.
Earthquake Disaster Management Approach: The Case of Al-Ais, Medina Area in Saudi Arabia  [PDF]
Said Ali El-Quliti, Tawfiq Bin Saeed Al-Harbi, Mahdi Bin Salem Al-Yami, Ahmed Bin Matar Al-Ghamdi, Mohammed Bin Mattar Al-Shammari
Open Journal of Earthquake Research (OJER) , 2016, DOI: 10.4236/ojer.2016.54018
Abstract: The research tackles earthquakes as one of the most dangerous natural disasters. It defines disasters in general, which in turn include earthquakes, how to manage them, stages of their evolution, and their classification among other kinds of disasters such as hurricanes, floods, drought, desertification, etc. Afterwards, it tackles the impacts of disasters on man, buildings and infrastructure. It defines also the codes and laws existing in the Kingdom of Saudi Arabia to confront and treat the impacts of earthquakes in their different stages (before, during and after) and the authorities involved in managing them. Then, it moves to study the case of Al-Ais Earthquake, and identifies the points of deficiency in dealing with such a disaster. Moreover, the research tackles some global experiences in how to handle the situation, reaching to the presentation of a conceptual approach to confront disasters of earthquakes in their various stages.
Removal of Carbaryl Pesticide from Aqueous Solution by Adsorption on Local Clay in Agadir  [PDF]
Mahmoud El Ouardi, Said Alahiane, Samir Qourzal, Abdelhadi Abaamrane, Ali Assabbane, Jamaa Douch
American Journal of Analytical Chemistry (AJAC) , 2013, DOI: 10.4236/ajac.2013.47A010
Abstract:

This study was conducted to assess the removal efficiency of pesticide (Carbaryl) used in Souss Massa region (Agadir city), on a clay originated from barrage situated in Agadir. The adsorption of Carbaryl from aqueous solution by local clay as a low-cost, natural and eco-friendly adsorbent was investigated. Different physicochemical parameters were analyzed: adsorbent mass, ionic strength (NaNO3), initial concentration of pollutant, temperature, and pH. The empirical results showed that all these parameters have an impact on the retention of pesticide on the clay. The equilibrium uptake was increased with an increase in the initial pesticide concentration in solution. The results of adsorption were fitted to the Langmuir and Freundlich isotherms. The Freundlich model represented the adsorption process better than Langmuir model, with correlation coefficients (R2) values ranged from 0.97 to 0.99. This study has shown that the natural clay is a solid that has got an important adsorption capacity, which may be used in treatment and depollution of water.

Factors Influencing the Photocatalytic Degradation of Reactive Yellow 145 by TiO2-Coated Non-Woven Fibers  [PDF]
Said Alahiane, Samir Qourzal, Mahmoud El Ouardi, Abdelhadi Abaamrane, Ali Assabbane
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.58053
Abstract: The photocatalytic degradation of the synthetic textile dye Reactive Yellow 145 (RY 145) in aqueous solution, using TiO2 coated non-woven fibers as photocatalyst, under UV-lamp irradiation, was studied. The effects of the operational parameters such as initial dye concentration, pH, addition of oxidant hydrogen peroxide and addition of ethanol on the reaction rate were investigated. The effect of some inorganic ions such as \"\" and \"\" , commonly present in real effluents, on the photodegradation of RY 145 was also examined. The experimental results showed that the photocatalytic degradation rate was favoured by a high concentration of solution in respect to Langmuir-Hinshelwood model. The maximum rate of complete decolorization of RY 145 was observed in the acidic medium at pH 3. The presence of \"\" and \"\" anions led to an increase of the effectiveness of the photocatalytic degradation. However, the presence of \"\" and \"\" anions decreased differently the photodegradation reaction rate. TiO2/UV process was proved to be capable of the complete degradation of the RY 145.
Effective Removal of Nitrates Ions from Aqueous Solution Using New Clay as Potential Low-Cost Adsorbent  [PDF]
Mahmoud El Ouardi, Samir Qourzal, Said Alahiane, Ali Assabbane, Jamaa Douch
Journal of Encapsulation and Adsorption Sciences (JEAS) , 2015, DOI: 10.4236/jeas.2015.54015
Abstract: In the present study, we investigated the performance of clay mineral originated from a dam situated in Morocco (Agadir city), as natural, low-cost, alternative and eco-friendly adsorbent for removal of nitrates ions from aqueous solution within a batch process. The clay was characterized by X-ray diffraction, Scanning Electron Microscopy (SEM), Dispersive Energy of Spectroscopy (EDS), Fourier Transform Infrared (FTIR) and surface area analysis (BET). The effects of various experimental parameters are examined such as contact time, initial concentration of pollutant, adsorbent mass and solution pH. The removal of nitrate was 71.89% at natural pH (pH = 5.1) using 1 g/l of adsorbent in 500 ml of nitrate solution having initial concentration of 300 mg/l (effect of contact time). Adsorption kinetic study revealed that the adsorption process followed first order kinetic. Theoretical correlation of the experimental equilibrium adsorption data for the Nitrate-New Clay system was properly explained by the Langmuir isotherm model. The maximum adsorption capacity was Qm, exp = 244.06 mg/g at 20℃ and at natural pH (with Qm, cal = 250 mg/g). An increase in adsorbent dosage increased the percent removal of nitrate, R = 1 g/l was considered as optimum dose and was used for further study. The pH heavily affected the adsorption capacity, and the percentage removal was found to decrease with increase in pH. The obtained results indicated that this New Clay (NC) was very good adsorbent for NO3-, interesting alternative material with respect to more costly adsorbent used, and could be used as a highly efficient adsorbent for the separation of nitrate from drinking or waste water.
The Influence of Zn2+ Ions Substitution on the Microstructure and Transport Properties of Mn-Zn Nanoferrites  [PDF]
Mohamed Ali Ahmed, Kasim El-Sayed Rady, Kamel Mohamed El-Shokrofy, Ahmed Abo Arais, Mohamed Said Shams
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.513095
Abstract: The effect of Zn2+ ions on the microstructure and electrical properties of Mn1-xZnxFe2O4 (0.0 ≤ x ≤ 0.5 in steps of 0.1) through a solid state reaction has been investigated. The structural properties have been investigated using X-ray diffraction (XRD) technique. The XRD analysis confirms that all samples are in a single-phase cubic spinel structure. The experimental lattice parameter (aexp) was decreased with increasing Zn2+ ions substitution due to the smaller ionic radius of zinc content. The crystallite size (t) of samples was estimated by Scherrer’s formula and found in the range (90 - 115 nm). Dc electrical resistivity and Seebeck voltage coefficients were measured as a function of temperature using the two probe methods. The temperature variation of resistivity exhibits two breaks, each break referring to a change in the activation energy. The Curie temperature estimated from dc resistivity measurement decreases with increasing Zn2+ ions. Seebeck voltage coefficient measurements reveal n-type conduction for all samples.
New Data Association Technique for Target Tracking in Dense Clutter Environment Using Filtered Gate Structure
El Said Mostafa Saad, El. Bardawiny, H. I. Ali, N. M. Shawky
Signal Processing : An International Journal , 2011,
Abstract: Improving data association process by increasing the probability of detectingvalid data points (measurements obtained from radar/sonar system) in thepresence of noise for target tracking are discussed in this paper. We develop anovel algorithm by filtering gate for target tracking in dense clutter environment.This algorithm is less sensitive to false alarm (clutter) in gate size thanconventional approaches as probabilistic data association filter (PDAF) whichhas data association algorithm that begin to fail due to the increase in the falsealarm rate or low probability of target detection. This new selection filtered gatemethod combines a conventional threshold based algorithm with geometricmetric measure based on one type of the filtering methods that depends on theidea of adaptive clutter suppression methods. An adaptive search based on thedistance threshold measure is then used to detect valid filtered data point fortarget tracking. Simulation results demonstrate the effectiveness and betterperformance when compared to conventional algorithm.
Geriatrics intensive care unit: Outcome and risk factors for in hospital mortality  [PDF]
Salma M. S. El Said
Advances in Aging Research (AAR) , 2013, DOI: 10.4236/aar.2013.24024
Abstract:

OBJECTIVES: To evaluate outcome and risk factors, particularly the (APATCHE II) score in elderly patients after admission to a geriatrics intensive care unit (ICU). Methods: A cross sectional study of patients ≥ 60 years admitted to the intensive care unit (ICU) of the Geriatrics department at Ain Shams University Hospital over 2 years period. We recorded age, sex, previous medical history, primary diagnosis, date of admission and discharge or death and APACHE II score on admission. Results: 202 patients admitted to the ICU were studied. The mean ICU mortality rates for these patients were (32, 5%), the mean APATCHE II score was (19.07). 27.3% of patients who died had hypokalemia and 43.2% had hyponatremia. Conclusion: ICU mortality rate are higher in elderly patients particularly with long ICU stay and hyponatremia.

Results of treatment of displaced supracondylar humeral fractures in children by percutaneous lateral cross-wiring technique
Wael A. El-Adl,Mohammed A. El-Said,George W. Boghdady,Al-Sayed M. Ali
Strategies in Trauma and Limb Reconstruction , 2008, DOI: 10.1007/s11751-008-0030-3
Abstract: Seventy children with displaced type II and III supracondylar fractures of the humerus were managed with percutaneous lateral cross-wiring technique from January 2006 to January 2007. There were 54 boys and 16 girls with a mean age of 6.1 ± 3.07 years. All patients were operated within 24 h after trauma using the Dorgans percutaneous lateral cross-wiring technique. Patients were followed up for a mean period of 6.1 ± 2.6 months and assessed both radiologically for union; and functionally and cosmetically according to Flynn’s criteria. All patients achieved solid union. Functionally, all patients achieved satisfactory results, while cosmetically, 91.4% of patients had satisfactory results and 8.6% had unsatisfactory results. The most frequently occurring complications were minor pin tract infection in six patients, deep infection in two patients, and 32 patients suffered excessive granulation tissue formation mostly around the proximal pin. There was no iatrogenic neurological injury either for the ulnar or for the radial nerves. The obtained results and minor complications reported signify this technique as a viable treatment method for displaced type II and III supracondylar fractures in children.
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