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Search Results: 1 - 10 of 407869 matches for " M. Ahmed "
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Kinetics and Modeling of H2S Removal in a Novel Biofilter  [PDF]
Zarook M. Shareefdeen, Wasim Ahmed, Ahmed Aidan
Advances in Chemical Engineering and Science (ACES) , 2011, DOI: 10.4236/aces.2011.12012
Abstract: Biofiltration has become a widely accepted technology for the removal of hydrogen sulfide (H2S) which is one of the major odor causing gases present in the air streams of municipal wastewater treatment facilities. In addition to odorous nature, H2S is toxic and corrosive. In this study, a biofilter which uses a novel media was employed in a pumping station which is closely located at the University City, Sharjah, UAE. The H2S removal performance data were collected and subsequently used in the determination of kinetics and modeling of H2S. The data were best represented by a first order biofilter model. Based on the first order kinetic constant, a correlation is developed to predict concentrations at the biofilter outlet. Based on the predicted outlet concentrations and dispersion (gaussian and US-EPA AERMOD) models, a study on H2S dispersion is conducted. The dispersion study confirmed a biofilter installation at the pumping station site would significantly reduce H2S levels in the University community and would provide cleaner air.
Clinical Outcome of Early Enteral Feeding on Patients Post Esophagectomy  [PDF]
Badawy M. Ahmed, Ahmed A. S. Salem
Journal of Cancer Therapy (JCT) , 2017, DOI: 10.4236/jct.2017.84029
Abstract: Objectives: Aim of our work is to study the effect of early enteral feeding through either nasoentral or feeding jejunostomy tube post esophagectomy on patients recovery and hospital stay. Background: Postoperative nutrition is a well known aspect of care in recent years and has been shown to decrease the incidence of complications and hospital stay. Enteral nutrition has been shown to be superior to parenteral nutrition as it is more physiological, safer, cheaper and early enteral nutrition has been clearly confirmed to reduce postoperative morbidity. Methods: This is randomized combined retrospective and prospective study that is conducted in surgical oncology department, South Egypt cancer institute, Assiut University; from October 2012 to October 2016. Patients in this study were divided into two groups: group 1 includes patients with feeding jejunostomy and group 2 is patients with nasoenteral tube. Results: 25 Patients included in this study (19 males & 6 females). All cases were primarily diagnosed as esophageal cancer, middle and lower 1/3 esophagus or proximal gastric carcinoma infiltrating cardia by clinical data associated with abdominal sonar and/or C.T scan and upper endoscopy with biopsy. There was no significant difference in catheter related complications (P value 0.238). There was no operative mortality. Conclusion: Early postoperative enteral nutrition was feasible and safe for patients undergoing esophagectomy. There is no significant difference between NE and FJ. Enteral nutrition either through nasoenteral or feeding jejunostomy is an effective method for postoperative nutritional support in this type of major surgery.
A Long-term Follow-up: Suture versus Mesh Repair for Adult Umbilical Hernia in Saudi Patients. A Single Center Prospective Study  [PDF]
Ahmed M. Kensarah
Surgical Science (SS) , 2011, DOI: 10.4236/ss.2011.23033
Abstract: Objective: To report results of mesh repair vs. the modified Mayo’s suture overlap in the surgical treatment of adult umbilical and paraumbilcal hernias in our medical center. Patients & Methods: The study is a Saudi single center single surgeon trial composed of sixty two patients. It was performed in the Surgical Department of King Abdul-Aziz University Hospital at Jeddah. The patients were randomly assigned into 2 groups. Group A patients underwent onlay mesh repair while modified Mayo’s repair was used in group B patients. Median follow-up was 28 months, and data were collected regarding size of hernia, type of the operation, complications, length of follow-up and the recurrence rate. Chi square test was used to compare results at 0.05 levels. Results: Complication was reported in 17% in group A and 8% in group B .There was no difference in scar pain, cosmetic result, and overall patient satisfaction between both groups. The recurrence rate was 10% for mesh repair and 18.8% for suture repair. Conclusions: Despite higher complication rate, mesh repair is superior to suture repair due to lower recurrence rate. Suture repair still has a place under certain circumstances, also it is simple less costly and has insignificant infection rate.
Taxonomic Study on the Feather Stars (Crinoidea: Echinodermata) from Egyptian Red Sea Coasts and Suez Canal, Egypt  [PDF]
Ahmed M. Hellal
Open Journal of Marine Science (OJMS) , 2012, DOI: 10.4236/ojms.2012.22007
Abstract: A taxonomic study on the crinoids (feather stars) collected from 34 sites from the Red Sea coasts and islands as well as the Suez Canal was done during the period from 1992 to 2003. A total of 15 species are now known from the Red Sea belonging to eleven genera under six families. Among them four species are endemic to the Red Sea and the two spe- cies, Decametra chadwicki and Lamprometra klunzingeri, are recorded from the Suez Canal for the first time. Also, the two species, Oligometra serripinna and Dorometra aegyptica, are new record from Gulf of Suez, and Decametra mollis from Gulf of Aqaba and Northern Red Sea. This study represents the first proper documentation of crinoid species in the study area. Summaries are provided of the specific habitats and geographical distribution.
Paratuberculosis Infection in Camel (Camelus dromidarius): Current and Prospective Overview  [PDF]
Ahmed M. Alluwaimi
Open Journal of Veterinary Medicine (OJVM) , 2015, DOI: 10.4236/ojvm.2015.57021
Abstract: Camel (Camelus dromidarius) is an important source of meat and milk and an iconic animal of the Saudi Arabian heritage. The accumulative evidence indicated the spread of paratuberculosis infection in the camel herds. Despite the explicit studies on the details of the disease in camels and methods of its diagnosis, paratuberculosis infection in camels suffers from wide gap of knowledge of the disease pathogenesis, camel immune responses to the infection and factors that enhance camel’s resistance to the infection. The review discusses the current available information of the disease pathobiology and the approaches employed in the diagnosis of paratuberculosis infection in camel. Effective control of the disease in camel prompts for urgent innovation of the current approaches in the diagnosis. Efficient policies and inspection tools are becoming vital to tackle the possible threats of Crohn’s disease to the public health due to the meat and milk consumption.
New Localization Technique for Mobile Wireless Sensor Networks Using Sectorized Antenna  [PDF]
Ahmed M. Khedr
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2015, DOI: 10.4236/ijcns.2015.89032
Abstract: Recently, there has been much focus on mobile sensor networks, and we have even seen the development of small-profile sensing devices that are able to control their own movement. Although it has been shown that mobility alleviates several issues relating to sensor network coverage and connectivity, many challenges remain. Among these, the need for position estimation is perhaps the most important. It is too expensive to include a GPS receiver with every sensor node. Hence, localization schemes for sensor networks typically use a small number of seed nodes that know their location and protocols whereby other sensor nodes estimate their location from the messages they receive. In this paper, we propose a new technique to localize mobile sensor nodes using sectorized antenna. We consider that both sensor nodes and seeds are mobile, and argue that mobility can be exploited to improve the accuracy and precision of localization. It is tested extensively in a simulation environment and compared with other existing methods. The results of our experiments clearly indicate that our proposed approach can achieve a high accuracy without need of high density of seeds.
Efficacy of Static and Intermittent Gravity Inverted Therapy Techniques in Improvement of Motor Apraxia and Cognitive Abilities in Autism Spectrum Disorder (ASD)  [PDF]
Ahmed M. Azam
World Journal of Neuroscience (WJNS) , 2018, DOI: 10.4236/wjns.2018.82025
Abstract: This work was carried out to investigate the efficacy of static and intermittent gravity inverted therapy techniques in improvement of motor apraxia and cognitive abilities in Autism Spectrum Disorder (ASD). 30 children were randomly joined in this study into two groups; Group A (sensory integration therapy approach plus static and intermittent inversion therapy techniques) and Group B (sensory integration therapy approach only). Block design test was used to locate and follow constructional apraxia, computerized information processing speed test to locate and follow cognitive processing and grooved pegboard test was used to locate and follow fine motor skills. The variance between pre- and post-treatment results was highly significant in the study group in all variables. By comparison of the two groups in constructional apraxia variables test at post-treatment, there was a highly representative elevation in favour to study groups (p < 0.05). By comparison of the two groups in cognitive processing variable at post-treatment, there was a highly representative elevation in favour to study group (p < 0.05). By comparison of the two groups in fine motor skills variable at post-treatment, there was a highly representative elevation in favor to study group (p < 0.05). According to the outcomes of this study, it can be terminated that the sensory integration therapy approach plus static and intermittent inversion therapy techniques can be recommended in improvement constructional apraxia and cognitive processing abilities in autism spectrum disorder (ASD) children.
Comparison Study between Posterior Fossa Decompression with Duroplasty and Posterior Fossa Decompression without Duroplasty, in 20 Cases of Chiari I Malformation  [PDF]
Ahmed M. Elshanawany
Open Journal of Modern Neurosurgery (OJMN) , 2018, DOI: 10.4236/ojmn.2018.84030
Abstract: Introduction: Chiari malformation Type I (CM-I) is typically defined as descent of the caudal tip of cerebellar tonsils at least 5 mm below the foramen magnum. The incidence of the malformation is not exactly known. Treatment of Chiari I malformation is debatable. Some advocate posterior fossa decompression (PFD) with duroplasty and others advocate posterior fossa decompression only without duroplasty. Aim of the Study: To compare the outcomes of patients who undergoing PFD with duroplasty and PFD without duroplasty, in Chiari I malformation. Patients and Methods: In the period between “January 2015-June 2016”, a prospective study was conducted involving 20 patients complaining of headache, motor and/or sensory affection secondary to Chiari I malformation. These patients were randomly divided into 2 groups. The first one had PFD with duroplasty and the other will have PFD without duroplasty. All patients had chiari one malformation in form of tonsillar herniation and cervical or cervico-dorsal syrinx. The average follow-up period was 9 months. Results: Over 90% of patients had a good clinical outcome, with improvement or resolution of their symptoms at last follow-up. There were no major complications. The mean length of hospital stay was 2.0 days. There was no perioperative death or neurological deterioration. The use of duroplasty was significantly associated with presence of complications and longer duration of hospital stay. Conclusion: PFD without duroplasty in cases of chiari I malformation carries a good results as well as PFD with duroplasty with lower risk of complications.
Controlling Diameter, Length and Characterization of ZnO Nanorods by Simple Hydrothermal Method for Solar Cells  [PDF]
Ahmed H. Kurda, Yousif M. Hassan, Naser M. Ahmed
World Journal of Nano Science and Engineering (WJNSE) , 2015, DOI: 10.4236/wjnse.2015.51005
Abstract: Zinc oxide (ZnO) nanorods have been synthesized by solution processing hydrothermal method in low temperature using the spin coating technique. Zinc acetate dehydrate, Zinc nitrate hexahydrate and hexamethylenetetramine were used as a starting material. The ZnO seed layer was first deposited by spin coated of ethanol zinc acetate dehydrate solution on a glass substrate. ZnO nanorods were grown on the ZnO seed layer from zinc nitrate hexahydrate and hexamethylene-tetramine solution, and their diameters, lengths were controlled by precursor concentration and development time. From UV-Visible spectrometry the optical band gap energy of ZnO nanorods was calculated to be 3.3 eV. The results of X-Ray Diffraction (XRD) showed the highly oriented nature of ZnO nanorods the hardest (002) peak reflects that c-axis elongated nanorods are oriented normal to the glass substrate. The Field Emission Scanning Electron Microscope (FESEM) was employed to measure both of average diameter of ZnO nanorods, Energy Dispersive X-Ray (EDX) is used to identify the elemental present and to determine the element composition in the samples.
Investigation and Comparison of 2.4 GHz Wearable Antennas on Three Textile Substrates and Its Performance Characteristics  [PDF]
M. I. Ahmed, M. F. Ahmed, A. A. Shaalan
Open Journal of Antennas and Propagation (OJAPr) , 2017, DOI: 10.4236/ojapr.2017.53009
Abstract:
In this paper, two different methods were used for investigating the RF characteristics of three types of textile materials. Goch, Jeans and Leather substrates were studied. A microstrip ring resonator method and DAK (Dielectric Assessment Kit) method were used. Bluetooth antennas were designed and fabricated using these substrates. The results were compared for the two methods. The bending effect of these antennas on its impedance characteristics due to human body movements was also studied. Finally, all antennas were simulated by CST simulator version 2016, fabricated using folded cupper and measured by Agilent 8719ES VNA. The measured results agree well with the simulated results.
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