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Search Results: 1 - 10 of 5265 matches for " Mohammed Abouelmaged "
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Role of Multidetector CT in Staging of Gastric Carcinoma  [PDF]
Hisham Mostafa Kamel Emam, Ehab Mansour Mohammed Moussa, Mohammed Abouelmaged, Maha Ragab Ismail Ibrahim
Journal of Cancer Therapy (JCT) , 2019, DOI: 10.4236/jct.2019.107046
Abstract: Background: Radiology plays an essential role in the diagnosis, staging and surveillance of oncology patients. CT is the most sensitive imaging modality in the workup of these patients. Aim of the Study: The aim of this work is to detect the role of MDCT (multidetector computed tomography) in the preoperative investigation of gastric adenocarcinoma patients according to TNM staging. Patients and Methods: This is a prospective study enrolling 20 patients who had histologically proven adenocarcinoma based upon an upper gastrointestinal endoscopic biopsy for MDCT staging of gastric carcinoma during the period from June 2016 to June 2017. The MSCT data were correlated and compared with the histopathological results. The study was conducted in the Radiology Department of Assiut University Hospital using 64-MDCT (Toshiba Aquilion). Results: According to our study results, the sensitivity of determining T1 stage on CT scan can’t be detected as there was only 1 case pathologically proved T1 and overstaged as T2 by MSCT; however, accuracy and specificity are quite high, which was 95% and 100% respectively. For T2 stage tumors (25.0% of cases), accuracy is 95%, sensitivity—100%, and specificity—93.7%. According to our results the accuracy and sensitivity of T3 staging are 75% and 100%, while those of T4 stage were 75% and 44.4% respectively. Tumor was correctly staged in 14 of 20 patients (the valid T staging rate was 70.0%). Tumor was under-staged in 5 of 20 patients (25.0%) (staged as T3, but pathologically proven to be T4a). As regards N staging accuracy found results for N0 (62.5%), N2 (87.5%) and N3 (75%), while N1 accuracy recorded 37.5%. As regards the nodal staging sensitivity which had a range from (0% for N4) to (66% for N2) this wide range of sensitivity demonstrates the problem of CT in nodal staging. As regards sensitivity of M0, accuracy was 100% and 85% respectively. While that of M1 was (62.5%) and (85%) respectively. Conclusion: MSCT can be the first choice for the preoperative evaluation of
Correlation of Endoscopic Findings with Various Helicobacter pylori Tests among Dyspeptic Patients  [PDF]
Mohammed O. Mohammed
International Journal of Clinical Medicine (IJCM) , 2014, DOI: 10.4236/ijcm.2014.519151
Abstract: Background: Helicobacter pylori is the most common chronic bacterial infection, and a significant etiological factor in acid peptic diseases and gastric cancer. Dyspepsia is a common gastrointestinal disorder, and the most common indication for gastroscopy. Detection of H. pylori during endoscopy has become standard clinical practice. Elevated levels of inflammatory markers such as C-reactive protein (CRP), are associated with pathological changes, and hence give useful information for exact diagnosis and therapy. Objectives: To determine the relationship between endoscopic findings, highly sensitive C-reactive protein level (hs-CRP) and H. pylori infection among dyspeptic patients using serological tests, stool antigen for H. pylori and antral histology. Methods: This was a prospective study; patients with dyspepsia, who referred to Kurdistan Teaching Center of Gastroenterology & Hepatology in Sulaimani City were assessed, during the period of December 2012 to March 2014. They underwent gastroscopy, and biopsies were taken from the corpus and antral portions of antral portion for histopathological exam. Patients’ serum samples were tested for H. pylori infection using ELISA method to detect (IgG & IgA) anti-bodies and stool samples were examined using rapid immunoassay method to detect H. pylori antigens. hs-CRP was assessed using ELISA. Results: One hundred dyspeptic patients were included in the study. The mean age was 34.2 years and male comprised 54% of the study samples. The common findings in oesophagogastroduodenoscopy (OGD) examination were antral gastropathy (59%) and duodenal ulcer (21%). A statistically significant (P < 0.01) correlation was found between hs-CRP and H. pylori IgG and IgA levels (titer). There was a highly significant (P < 0.01) correlation between the level of H. pylori IgG and the endoscopic findings. The highest serum level of H. pylori IgG was found in duodenal ulcer and antral gastritis, (88.86 ± 42.0) and (70.05 ± 35.2) Au/ml, respectively. There was a highly significant correlation (P < 0.01) between endoscopic findings and H. pylori positive antral biopsy, in duodenal ulcer, antral gastritis and duodenitis was 100%, 94.9% and 75% respectively. Also duodenal ulcer and antral gastritis showed high mean and percentage but no significant differences in both H. pylori IgA and stool Antigen.
General Periodic Boundary Value Problem for Systems  [PDF]
Mohammed Elnagi
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.38130
Abstract: The paper deals with the existence of nonzero periodic solution of systems, where k∈(0, π/T), α, β are n×n real nonsingular matrices, μ=(μ1…μn), f(t, u)=(f1(t, u),…,fn(t, u))∈C([0, T]×□n+,□+) is periodic of period T in the t variable are continuous and nonnegative functions. We determine the Green’s function and prove that the existence of nonzero periodic positive solutions if one of . In addition, if all i=(1…n)where λ1 is the principle eigenvalues of the corresponding linear systems. The proof based on the fixed point index theorem in cones. Application of our result is given to such systems with specific nonlinearities.
Pseudocercospora leaf and fruit spot disease of citrus: Achievements and challenges in the citrus industry: A review  [PDF]
Mohammed Yesuf
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.47046
Abstract:

Citruses are the worlds’ second fruit crops by volume next to banana. It is one of the most important commodity in tropical Africa as source of foreign currency, raw material for agro-industries and source of employment. The production and productivity of citrus in tropical Africa including Ethiopia are critically threatened by a number of diseases. Among others, pseudocercospora leaf and fruit spot of citrus caused by a fungus Pseudocercospora angolensis is the most destructive disease of citrus. Literature reviews have been made by searching the available information on leaf and fruit spot of citrus. Journal articles, research papers, workshop proceedings, Thesis research, manuals, and quarantine regulations were among the information sources of the review. The disease is widespread in 22 African countries including Ethiopia with a single report around Yemen in the Arabian Peninsula. Scattered research efforts have been made by different researchers in Africa mainly dealing with its geographic distribution, biology, and management practices. Fungicides, plant extracts/essential oils, and host resistance are among the research efforts made for the control of P. angolensis. Even though the disease is not yet reported to the rest of the world, it becomes a serious concern as an important quarantine pest thereby critically affecting the world trade and germplasm exchange of the citrus industry. Therefore, the purpose of this paper is to compile the scattered information on various aspects of leaf and fruit spot of citrus mainly to avail the information for researchers, development workers and policy people. Moreover, this review will suggest future research and development direction towards better understanding and sustainable management practices of the disease.

Variation of the Spectrum of Operators in Infinite Dimensional Spaces  [PDF]
Mohammed Yahdi
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.37080
Abstract:

The paper investigates the variation of the spectrum of operators in infinite dimensional Banach spaces. Consider the space of bounded operators on a separable Banach space when equipped with the strong operator topology, and the Polish space of compact subsets of the closed unit disc of the complex plane when equipped with the Hausdorff topology. Then, it is shown that the unit spectrum function is Borel from the space of bounded operators into the Polish space of compact subsets of the closed unit disc. Alternative results are given when other topologies are used.

A New Expression for Rhotrix  [PDF]
Abdul Mohammed
Advances in Linear Algebra & Matrix Theory (ALAMT) , 2014, DOI: 10.4236/alamt.2014.42011
Abstract:
This paper presents a new technique for expressing rhotrices in a generalize form. The method involves using multiple array indexes as analogous to matrix expressions, unlike the earlier method in the literature, which can only be functional in a single array computational environment. The new rhotrix look will encourage the study of rhotrix algebra and analysis from a better perspective. In addition, computing efficiency and accuracy will also be improved, particularly when the operations in rhotrix space over the new expression are algorithmatized for computing machines.
Nature of Centennial Global Climate Change from Observational Records  [PDF]
Mohammed Anwer
American Journal of Climate Change (AJCC) , 2015, DOI: 10.4236/ajcc.2015.44027
Abstract: In order to provide a better benchmark for climate simulation programs, climate data at Global Historical Climatology Network (GHCN) and Global Summary of the Day (GSOD) archived by the National Climate Data Center (NCDC) are used to ascertain the nature of climate change over the last century. After data validation, about 6000 stations are considered globally to determine the change in mean temperature, and about 5000 stations to determine that change in maximum and minimum temperatures. Global nature of temperature and its change are presented separately for January and July. Both maximum and minimum daily temperatures are used in the analysis. Trend of global change in annual precipitation is also reported here. Least square linear regression is used to ascertain the nature of these changes. Global nature of temperatures in both January and July show bimodal distributions, with the geographical region between the tropics in one mode and the region outside the tropic in another mode. The individual distributions of temperatures of both these regions show separate and similar histograms. Results indicate that over the last century, temperature in January increased more than that during July. Furthermore the minimum temperature in each case increased more than the maximum temperature. Ten separate estimates of temperature change are obtained from the data presented here using different methods. Considering all these estimates, the mean rise in temperature during January was 2.19°C, and during July was 1.72°C. The geographical nature of the rise in temperature shows that though it rises in most locations, the temperature also reduces along eastern Asia, some parts of central Russia, along south-eastern Australia, and along the east coast of the United States. Predominant rise in temperature is mostly over Europe, and in the arctic. Change in precipitation shows that though there is significant reduction rainfall globally, rainfall increases along the equator, in areas around the Gulf of Mexico, along eastern Asia, along the western coast of India, and along the eastern coast of Australia.
Performance of Heat Pipe Utilized for Atmospheric Air Heating  [PDF]
Mohammed Mansur
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.38125
Abstract:

The objective of the present experimental work is to investigate the performance of a wrapped screen heat pipe for atmospheric air heating to compare with the limits of this pipe. The experiment was conducted using copper pipe material and acetone as working fluid at different vapor temperatures. The testing also consists of a heater, a blower for heat removal (condenser), temperature measuring device, a vapor temperature probe, acetone charging system, and a vacuum pump. The copper outside diameterof the pipe is 0.022 m, with a total length of 0.6 m. The results showed that the pipe wall temperature (Tw) for a wrapped screen heat pipe has a rapid increase and takes 50 min to reach steady state at (Q = 63 W). The vapour temperature of working fluid increases as the heat load increases at constant air velocity. It was also been found that the range of vapour temperature deceases as the filling ratio increases that means the increasing of the filling ratio results the decrease of the maximum vapour temperature and the variation in the vapour temperature. The best recorded filling ratio is 0.6 which has the lowest vapour temperature at highest heat load. The maximum heat transport limit for this pipe is 80 W and the maximum temperature difference for air is 5C.

Development of a GIS Based Public Transport Composite Social Need Index in Jeddah  [PDF]
Mohammed Aljoufie
Journal of Geographic Information System (JGIS) , 2016, DOI: 10.4236/jgis.2016.84039
Abstract: Provision of public transport is critical for all social groups with high need. The provision of effective public transport system in Jeddah is at the top priorities of the national, regional and local plans. This paper attempts to develop a public transport composite social need index in Jeddah using GIS. Population density, car ownership, family size and income level indicators were considered for identifying the social need in Jeddah. Results indicate that Jeddah is in high social need for public transport and the provision of an efficient public transport is crucial for the city. The composite social need index has shown both dispersed and clustered patterns of high need for public transport in Jeddah. The results of this study facilitate the identification of the high social need for public transport in Jeddah. Further studies are highly recommended to include other social need indictors in Jeddah city.
Analysis of Illegal Parking Behavior in Jeddah  [PDF]
Mohammed Aljoufie
Current Urban Studies (CUS) , 2016, DOI: 10.4236/cus.2016.44026
Abstract: Parking spaces play a vital role in the transportation system. Parking policies ensure the efficient of the transportation system and the management of traffic demand. Illegal parking practice can hamper sustainability of transportation system. This paper attempts to analyze the illegal parking behavior in Jeddah city, Saudi Arabia. Car parking in the city of Jeddah is largely uncontrolled and there is a lack of management of the public parking supply and controlled parking system. Parking survey at five main locations (roads) at Jeddah city was conducted. Legal and illegal parking were observed at the five roads. The observations were distributed over three time periods: 7:00-9:00 am period (morning peak), 12:00-15:00 pm period (afternoon peak) and 18:00-21:00 pm period (evening peak). The observations were collected, studied and compared for weekdays and weekend. Results indicate that illegal parking seems to be common in Jeddah city both on weekdays and weekend hampering the sustainability of transportation system. It is crucial for Jeddah city to deploy stringent parking policies in order to reduce the consequences of illegal parking behavior and to achieve sustainability in transportation.
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