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Search Results: 1 - 10 of 1699 matches for " Saad Mogren "
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Saltwater Intrusion in Jizan Coastal Zone, Southwest Saudi Arabia, Inferred from Geoelectric Resistivity Survey  [PDF]
Saad Mogren
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.63022
Abstract: This work focuses on the causes of water quality deterioration in the coastal plain of Jizan area, southwest Saudi Arabia using vertical electrical sounding (VES) surveys. Schlumberger electrode array is used in the study with the current electrode spacing ranging from 400 to 600 m to delineate the thickness of the shallow aquifer and its possible interaction with the sea water. The differences in resistivity are associated with the variations in lithology and groundwater saturation and salinity. The interpretation of VES curves reveals low resistivity zones characterizing the study area. These zones reflect saline water intrusion in the coastal aquifer. Generally, it is observed that the resistivity of saturated zone decreases towards the sea, indicating the influence of seawater. Based on the interpretation of the constructed resistivity pseudo-sections and 1-D sequential inversion models, three factors are identified to control the seawater intrusion into the shallow groundwater aquifers: 1) presence of faults that contribute extensively in the seawater intrusion as the seawater invades the coastal aquifers through the crushed rocks in fault zones related to the Red Sea rifting, 2) over-withdrawal of groundwater from the coastal aquifers, resulting in saline water intrusion from the sea into the freshwater aquifer, and 3) the lithological variation where the alluvial sediments of the ancient buried wadi (dry valley) channels provide potential pathways for saltwater intrusion and make a hydraulic connection between the aquifer and the sea water.
Total Organic Carbon Enrichment and Source Rock Evaluation of the Lower Miocene Rocks Based on Well Logs: October Oil Field, Gulf of Suez-Egypt  [PDF]
Aref Lashin, Saad Mogren
International Journal of Geosciences (IJG) , 2012, DOI: 10.4236/ijg.2012.34069
Abstract: October oil field is one of the largest hydrocarbon-bearing fields which produces oil from the sand section of the Lower Miocene Asl Formation. Two marl (Asl Marl) and shale (Hawara Formation) sections of possible source enrichment are detected above and below this oil sand section, respectively. This study aims to identify the content of the total organic carbon based on the density log and a combination technique of the resistivity and porosity logs (Δlog R Technique). The available geochemical analyses are used to calibrate the constants of the TOC and the level of maturity (LOM) used in the (Δlog R Technique). The geochemical-based LOM is found as 9.0 and the calibrated constants of the Asl Marl and Hawara Formation are found as 11.68, 3.88 and 8.77, 2.80, respectively. Fair to good TOC% content values (0.88 to 1.85) were recorded for Asl Marl section in the majority of the studied wells, while less than 0.5% is recorded for the Hawara Formation. The lateral distribution maps show that most of the TOC% enrichments are concentrated at central and eastern parts of the study area, providing a good source for the hydrocarbons encountered in the underlying Asl Sand section.
Gravity Modeling for the Rifted Crust at the Arabian Shield Margin – Further Insight into Red Sea Spreading  [PDF]
Saad Mogren, Manoj Mukhopadhyay
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.32B007
Abstract:

A large variation in elevation and gravity anomaly prevails from the Red Sea coast to the interior of the Arabian Shield (AS) across the Asir Igneous Province (AIP); The Asir Mountain (AM) is developed on AIP. Here the elevation varies from 45 - 2700 m, corresponding changes in F.A. are from –30 to + 220 mgal and B.A. from +22 to –175 mgal. Regression relationships between elevation and gravity anomalies demonstrate significant changes in trend at about 400 m threshold of elevation across the pediment west of AM, at about 45 km inland of the shoreline, flanking the Hizaz-Asir Escarpment (HAE). Gravity anomaly variation along a traverse taken across HAE and AIP is interpreted here in terms of anomalous masses in crust as well as due to deeper crustal configuration. 2D gravity interpretation is, in part, constrained by surface geology, available geologic cross-sections for crust, interpretations from the IRIS Deep-Seismic Refraction Line, and to a lesser extent by the available gross results from shear-wave splitting and receiver function analysis. The gravity model provides probable solutions for the first time on geometric configuration and geophysical identification: a) for the seaward margin of the mid-Tertiary Mafic Crust (TMC) below sediment cover of the Asir pediment that coincides with the 400 m threshold elevation. This signifies an anomalous uplift at the rifting phase. Moho below TMC extends from 10 - 22 km depth across HAE and west margin of AIP, b). Thinned continental crust below the Asir margin whose upper layer coincides with a seismic reflector is at about 22 km depth, c). Rift-margin characteristic detachment fault associated with basaltic flows on top surface of TMC at its inner margin, d). Two geologically mapped low-angle normal faults dipping to the east developed between the basic rocks intruding the AIP and e). felsic pluton farther east within AS. Large scale igneous activity followed by intense deformation affecting AIP clearly owes their origin to the rifting architecture of the AS at the Red Sea extensional margin.

A Powerful Optimization Approach for the Multi Channel Dissemination Networks
Ahmad Saad Al-Mogren
International Journal of Computer Networks & Communications , 2010,
Abstract: In the wireless environment, dissemination techniques may improve data access for the users. In this paper, we show a description of dissemination architecture that fits the overall telecommunicationnetwork. This architecture is designed to provide efficient data access and power saving for the mobile units. A concurrency control approach, MCD, is suggested for data consistency and conflict checking. A performance study shows that the power consumption, space overhead, and response time associated with MCD is far less than other previous techniques.
A Powerful Optimization Approach for the Multi Channel Dissemination Networks
Ahmad Saad Al-Mogren
Computer Science , 2010, DOI: 10.5121/ijcnc.2010.2210
Abstract: In the wireless environment, dissemination techniques may improve data access for the users. In this paper, we show a description of dissemination architecture that fits the overall telecommunication network. This architecture is designed to provide efficient data access and power saving for the mobile units. A concurrency control approach, MCD, is suggested for data consistency and conflict checking. A performance study shows that the power consumption, space overhead, and response time associated with MCD is far less than other previous techniques.
Physical activity and persistent low back pain and pelvic pain post partum
Ingrid M Mogren
BMC Public Health , 2008, DOI: 10.1186/1471-2458-8-417
Abstract: This study is a follow-up study of 639 women who reported LBPP during pregnancy. These women were sent a questionnaire at approximately six months after delivery. The respondents were divided into three groups: 'no pain', 'recurrent pain', and 'continuous pain'. Data were analysed using an independent samples t-test, Pearson's chi-squared test, and univariate and multivariate logistic regression analyses.44.5% of subjects reported current PA at six months post partum. The mean starting time of PA was 2.6 months post partum and the mean number of current, weekly events of PA was 3.4; there were no differences between the groups. 82.2% reported previous PA at some period in life. Women with BMI ≥ 30 reported current PA to a lesser extent. The number of years of pre-pregnancy PA did not influence the risk of persistent LBPP.Almost half of women who had experienced LBPP during pregnancy reported PA at six months post partum. The number of years of pre-pregnancy PA did not influence the risk of persistent LBPP. Obesity was a risk factor for not practising PA.A majority of women suffer from low back pain and pelvic pain during pregnancy [1,2]. This pregnancy-related condition negatively influences self-estimated health and interferes with sexual activity during pregnancy [3]. The risk of experiencing LBPP in a subsequent pregnancy is extremely high [4,5]. Around four out of ten women report persistent LBPP half a year after delivery [6-9]. Remission of the condition primarily occurs during the first six months after delivery [10]. At three years post partum, 20% of all women with back pain during pregnancy report persistent symptoms [11]. Post partum back pain has been associated with considerable perceived disability in movement-related activities [12].Physical activity is a major determinant of life-long health [13,14], and is well known to be beneficial for physical and psychological well-being before, during, and after pregnancy [15,16]. Unfortunately, the epidemiolog
Assessing the Usability of Institutions Web Pages  [PDF]
Saad Subair
International Journal of Internet and Distributed Systems (IJIDS) , 2014, DOI: 10.4236/ijids.2014.23003
Abstract: The usability of the web pages is assessed using some statistical models. Researchers argue that many usability results and recommendations lack empirical and experimental data. Universities web pages are chosen as subjects for this work. Series of experiments have been conducted to investigate into the usability and design of the universities web pages. Prototype web pages have been developed according to the structured methodologies of web pages design and development. Four universities web pages were evaluated together with the prototype web pages using a questionnaire which was designed according to the Human Computer Interactions (HCI) concepts. The data collected was analyzed using correlation and regression models. The correlation analysis showed that there were significant positive and negative correlations between many items. The regression analysis revealed that the most significant factors (items) that contributed to the best model of the universities web pages design and usability were: multimedia in the web pages, the web pages icons (alone) organization and design, and graphics attractiveness. The results showed some of the limitations of some heuristics used in conventional interface system design and proposed some additional heuristics in web pages design and usability.
Analysis of the Performance Indicators of the PV Power System  [PDF]
Saad Odeh
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.66005
Abstract: The energy assessment of the PV power systems is carried out by using different types of performance indicators that benchmark the output of these systems against the PV panel maximum output at hypothetical operation conditions. In this paper, a comparative analysis of six types of performance indicators is conducted and a new performance indicator which considers PV panel slope and orientation is proposed. The proposed indicator is benchmarking the PV system actual output against the maximum output of the same system if it would operate in two axis tracking mode. The proposed performance indicator is used to develop a friendly user calculator of PV system output that can be used by, energy providers and PV system installers to evaluate the output of the PV grid connect network. The advantage of the developed calculator is high-lighted by a case study that estimates energy capacity of different residential rooftop PV systems installed in a residential suburb in Sydney.
The Relationship between Program Evaluation Experiences and Stakeholder Career Satisfaction  [PDF]
Saad F. Shawer, Saad A. Alkahtani
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.38196
Abstract: This paper examines the relationship between program evaluation experiences and stakeholder career satisfaction. The study employs mixed paradigms, descriptive and correlational research, qualitative evaluation, interviews, rating-scales and the parametric Pearson product-moment coefficient of correlation. Data analysis reveals differences between the descriptive and correlational findings. The descriptive findings show low faculty and program director career satisfaction at the beginning of program evaluation while concluding program evaluation experiences show a dramatically high career satisfaction. Correlational results, however, indicate not only a relatively low but also negative correlation between initial and final program evaluation experiences in career satisfaction. The study concludes a relationship exists between initial and final program evaluation experiences in stakeholder career satisfaction. The more program evaluation experiences stakeholders have, the less career dissatisfaction signs they show. Supportive program evaluation contexts lower program stakeholder negativity and encourage effective implementation and use of program evaluation.
Surprisingly low compliance to local guidelines for risk factor based screening for gestational diabetes mellitus - A population-based study
Margareta Persson, Anna Winkvist, Ingrid Mogren
BMC Pregnancy and Childbirth , 2009, DOI: 10.1186/1471-2393-9-53
Abstract: This study design was a population-based retrospective cross-sectional study of 822 women. A combination of questionnaire data and data collected from medical records was applied. Compliance to the local guidelines of risk factor based screening for GDM was examined and a comparison of outcomes of pregnancy and delivery in relation to risk factor groups for GDM was performed.Of the 822 participants, 257 (31.3%) women fulfilled at least one criterion for being exposed to screening for GDM according to the local clinical guidelines. However, only 79 (30.7%) of these women were actually exposed to OGTT and of those correctly exposed for screening, seven women were diagnosed with GDM. Women developing risk factors for GDM during pregnancy had a substantially increased risk of giving birth to an infant with macrosomia.Surprisingly low compliance with the local clinical guidelines for screening for GDM during pregnancy was found. Furthermore, the prevalence of the risk factors of GDM in our study was almost doubled compared to previous Swedish studies. Pregnant women developing risk factors of GDM during pregnancy were found to be at substantially increased risk of giving birth to an infant with macrosomia. There is a need of actions improving compliance to the local guidelines.Gestational diabetes mellitus (GDM) is defined as carbohydrate intolerance that is initiated or detected during pregnancy [1]. GDM is associated with other pregnancy complications and is an indicator of future development of diabetes mellitus type 2 [2]. In Sweden, the prevalence of GDM is reported in 1.2 - 2.3% of the pregnant women [3-6]. Since the 1990s, Sweden has officially adopted the European recommendation of selective screening for GDM [7]. However, a Swedish audit of all local guidelines for screening, diagnostics and treatment for GDM reveals no national unified guidelines [8].Risk factors for GDM may be categorized in maternal or pregnancy-related factors. The risk factors include obesi
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