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Search Results: 1 - 10 of 18601 matches for " Mashael Al Saud "
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Assessment of Flood Hazard of Jeddah Area 2009, Saudi Arabia  [PDF]
Mashael Al Saud
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.29099
Abstract: Due climatic variability and anthropogenic changes, floods have been raised lately in several regions worldwide. The resulting impact from floods is often harmful. This can be applied to Saudi Arabia, the country which is known by dry climatic conditions, and it became lately a typical region for such natural hazard. Hence, floods are observed as a yearly disaster with high magnitude of influence. Jeddah, a coastal Saudi city on the Red Sea to the west, has witnessed severe event in November 2009, when flooded water and sediments (torrents) invaded the urban areas and resulted decease of many people and destroyed the infrastructure and civilized zones. The lack of mitigation implements exacerbated the problem. This study implies an assessment of flood hazard risk in Jeddah region. It aims to identify the zones subjected to flood and then inducing the influencing factors at different levels of effect. For this purpose space techniques were utilized, with a focus on IKONOS satellite images, which are characterized by high resolution in identifying terrain features. In addition Geographic Information System (GIS) was also used to support space techniques. Thus, damaged areas and the mechanism of flooding process were recognized. This helps avoiding further urban expansion in areas under flood risk and will aid decision maker to put new strategies for hazard management.
Watershed Characterization of Wadi Aurnah, Western Arabian Peninsula  [PDF]
Mashael AL SAUD
Journal of Water Resource and Protection (JWARP) , 2009, DOI: 10.4236/jwarp.2009.15038
Abstract: The Western part of Arabian Peninsula constitutes a shield-like mega-structure, in which mountain chains are oriented in the NW-SE direction. Along this mountainous region, surface runoff is almost diverted to-wards the Red Sea in the west. Thus, several catchment topographic units exist to capture rainfall water among them. Even tough, the precipitation rate in the Western part of Arabian Peninsula is low (i.e. <200mm), yet a number of drainage systems occur and reveal empirical stream networking. However, stud-ies belong to the watersheds located in the Western part of Arabian Peninsula are still rare and sometimes they show erroneous morphological characterization, notably in the catchments delineation. This is attributed mainly to the complicated drainage pattern, which is structurally-controlled. Thus, related morphological and hydrological studied obtained on these drainage systems reveal discreditable results and measures. This study aims to characterize Wadi Aurnah Watershed (~3113 km2), which comprises a typical catchment in the Western part of Arabian Peninsula. In addition to topographic maps, remotely sensed data (ASTER and IKONOS satellite images) were utilized to delineate water divides with the most precision. Consequently, relevant morphological and hydrological characteristics of Aurnah watershed were obtained.
Diabetes Monitoring System Using Mobile Computing Technologies
Mashael Saud Bin-Sabbar,Mznah Abdullah Al-Rodhaan
International Journal of Advanced Computer Sciences and Applications , 2013,
Abstract: Diabetes is a chronic disease that needs to regularly be monitored to keep the blood sugar levels within normal ranges. This monitoring depends on the diabetic treatment plan that is periodically reviewed by the endocrinologist. The frequent visit to the main hospital seems to be tiring and time consuming for both endocrinologist and diabetes patients. The patient may have to travel to the main city, paying a ticket and reserving a place to stay. Those expenses can be reduced by remotely monitoring the diabetes patients with the help of mobile devices. In this paper, we introduce our implementation of an integrated monitoring tool for the diabetes patients. The designed system provides a daily monitoring and monthly services. The daily monitoring includes recording the result of daily analysis and activates to be transmitted from a patient’s mobile device to a central database. The monthly services require the patient to visit a nearby care center in the patient home town to do the medical examination and checkups. The result of this visit entered into the system and then synchronized with the central database. Finally, the endocrinologist can remotely monitor the patient record and adjust the treatment plan and the insulin doses if need.
Study of the Effect of Weathering in Natural Environment on Polypropylene and Its Composites: Morphological and Mechanical Properties
Mashael Al-Shabanat
International Journal of Chemistry , 2011, DOI: 10.5539/ijc.v3n1p129
Abstract: Three kinds of samples of PP, the first was pure PP, second was PP with the basic stabilization and the third with the talc as inorganic filler. The samples were produced using injection molding. The stability of prepared samples in natural weathering condition of Riyadh, in Saudi Arabia was studied. FT-IR and SEM were used to analyze the structural change. Stress at break, elongation at break and young's modulus measured as mechanical properties. However, talc was found to be able to stabilize PP a little.
Using ASTER Images to Analyze Geologic Linear Features in Wadi Aurnah Basin, Western Saudis Arabia
M. Al Saud
The Open Remote Sensing Journal , 2008, DOI: 10.2174/187541390100101017]
Abstract: Remotely sensed data often used to study terrain surface, thus unique geomorphic and geologic features can be identified. The processing of satellite images is successfully utilized in this respect. Therefore, lineaments are commonly known among these features. They are observed as linears on satellite images and usually represent fracture traces, faults or lithologic boundaries. These systems are well utilized in the interpretation of several hydrogeological and tectonic criteria. This study introduces the procedure of identifying linear features in Wadi Aurnah basin (3100km2), of the Arabian Peninsula. Hence, the lineaments map for this catchment was produced. For this purpose, ASTER satellite images were treated using ENVI4.3 and ERDAS Imagine software. Consequently, the obtained map was analyzed using GIS techniques to interpret the behavior of the existing lineaments and their spatial distribution. This will provide valuable information that can be used in several studies related to water resources management in this basin, which is under water stress.
2-Methyl-2-(2-pyridyl)hexahydropyrimidine
Saud Al-Resayes
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809025963
Abstract: In the aminal-type title compound, C10H15N3, the six-membered hexahydropyrimidine ring adopts a chair conformation and the N atoms are pyramidally coordinated. One of the two amido –NH units engages in intermolecular hydrogen bonding with the pyridyl N atom, generating a helical chain running along the b axis of the orthorhombic unit cell.
Weight-length Relationships, Gonadosomatic Indeces, Sex Ratios and Relative Weight of the Omani-Indian Oil sardine, Sardinella longiceps (Valenciennes1847) from Al-Seeb Area; Sultanate of Oman
Al-Jufaili Saud
Advance Journal of Food Science and Technology , 2011,
Abstract: This study presents the weight-length relationship and spawning period of the Omani Indian Oil sardine Sardinella longiceps (Valenciennes 1847) which inhabits the near shore zone along the Omani coast. A total of 1744 specimens were collected between January 1997 to February 1998 from Al-Seeb; a suburban area situated by the sea in Muscat, Oman. Samples were obtained on a monthly basis from beach seine and gillnet catches. The female to male sex ratio was obtained to be 0.6. The monthly variation in the gonadosomatic indexes indicates that the fish spawn in March; August and February. The overall length-weight relationships were found to be W = (8.13×10-6)×L3; W = (9.07×10-6)×L3; and for the W = (8.43×10-6)×L3 combined sexes; female; and male; respectively. The length at which 50% of the sardines were estimated to be 172 mm (43.48 g) for the combined sexes; 169 mm (41.3 kg) for females; and 167 mm (39.74 g) for males.
Feasibility Study of Solar Energy Steam Generator for Rural Electrification  [PDF]
Mouaaz Nahas, M. Sabry, Saud Al-Lehyani
Energy and Power Engineering (EPE) , 2015, DOI: 10.4236/epe.2015.71001
Abstract: In Middle East region, where there are plentiful amounts of solar radiation and great desert areas, solar energy can play a potential role in replacing conventional fuel-operated electricity generation methods with a cost-effective, sustainable solution. This paper presents a feasibility study of a low-cost solar energy steam generator for rural areas electrification. The proposed system is based on the use of trough concentrator which converts solar radiation into thermal energy in its focal line (where a receiver pipe is installed with a fluid flowing in its interior). The aim of the paper is to predict the feasibility and potential for steam generation using a stand-alone solar concentrator with a small dimension for domestic and small-scale electricity generation. The study presented here is based on modelling of the system to determine the points at which the system is expected to produce sufficient steam energy at the tube outlet to drive a steam engine for producing electricity. Results are presented in graphical forms to show the operating points and the effect of changing selected input parameters on the behavior of the system in order to set some limits (boundaries) for such parameters. Results show that among the three input design parameters selected, the tube diameter is the most dominant parameter that influences steam energy, then the tube length and finally the flow rate of the water passing through the tube. The results of this paper can provide a useful guideline for future simulation and/or physical implementation of the system.
Reduction of Evaporation from Water Surfaces-Preliminary Assessment for Riyadh Region, Kingdom of Saudi Arabia
Mohammed I. Al-Saud
Research Journal of Soil and Water Management , 2013, DOI: 10.3923/rjswm.2010.5.9
Abstract: The extremely high rate of evaporation from water surfaces in arid and semi-arid regions greatly reduces optimal utilization of water reservoirs. Therefore, applying techniques to reduce evaporation greatly needed. During last decades, a large number of multipurpose dams (258) with overall design capacities of (~898 MCM), were constructed and distributed over the entire Kingdom. Hence, preserving and protecting the stored water dams reservoirs by reducing evaporation is strategic future task of the Saudi government. The present study was conducted for 7 months, from June-December 1998. Experiment was conducted in Riyadh with three US Class-A evaporation pans and a weather station. Fatty alcohol emulsion was selected to reduce the evaporation during summer months in Riyadh. Various concentrations of emulsion substance were used in different pans. First pan (H0) was filled with water without adding emulsion while in pan (H1), Fatty alcohols emulsion was added with recommended concentration of (100 g/1000 m2/day) and similarly in pan (H2) emulsion was added with double of concentration (200 g/1000 m2/day). The preliminary results of the study indicated that evaporation rate from surface water was reduced overall up to 47.2 and 50.5% in pans (H1) and (H2), respectively as compared to pan (H0).
Sensitivity of the F35% Target Fishing Rate to Variation in the Maturity Schedule
M. Al-Jufaili Saud
Journal of Fisheries International , 2012,
Abstract: Monte Carlo simulation experiments were conducted to explore how variability in the maturity schedule for English sole Pleuronectes vetulus is transformed into variability in estimates of F35%. Random values were generated for age at 50% maturity and the maturity slope coefficient for each of 10935 combinations of 8 factors. From these simulated data F35% values were derived and summarized for each experimental treatment as an average F35% value and coefficient of variation. The summary statistics were then transformed and analyzed using forward stepwise linear regression to determine the relative importance of different factors plus a quadratic term were required to account for 90% of the variability in the data, whereas in the model for coefficient of variation in F35% all eight factors, plus interaction term and a quadratic term, were required to account for 90% of the variability in the data. In both models the age at 50% maturity and the age at 50% selection were the two most important explanatory variables.
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