OALib Journal期刊

ISSN: 2333-9721




2019 ( 2 )

2018 ( 231 )

2017 ( 260 )

2016 ( 345 )


匹配条件: “ Mohammed Al-Qubaty” ,找到相关结果约21846条。
Clinicopathological Pattern of Gastric Cancer of Yemeni Patients in Ibb Governorate  [PDF]
Abdulgafoor Kassim, Mohammed Al-Qubaty, Fayed Al-Yousofy, Ramea Alathwary, Sana Ameen
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104415
Objectives: To study the clinicopathological pattern of gastric cancer in-cluding the location of the tumor in the stomach and to compare our results with other studies. Design: Prospective study of patients confirmed with gastric malignancy during the period from July 2016 to July 2017. Setting: Specialized center of gastrointestinal and liver diseases in Ibb city, Yemen. Subjects: All patients with histopathological confirmation of gastric malig-nancy. Results: During the study period, we had 69 patients with gastric cancer; among them 48 were males and 21 were females, with male: Female ratio is 2.2:1. The age ranged between 35 years and 90 years and the mean age was 65.87 ± 12.79 years. Most of the patients presented with epigastric pain (87%), weight loss (72.5%), pallor (65.2%), dysphagia (47.8%), vomiting (42%), palpable epigastric mass (20.3%) and hematemesis/melena (18.8%). The cardiofundal location was encountered in 33 cases (47.8% ), 22 (45.8%) males and 11 (52.4%) females, the corpus location in 24 cases (26%), 20 (41.7%) males and 4 (19%) females, the antral location in 8 cases (11.6%), 4 (8.3%) males and 4 (19%) females and the whole stomach in 4 cases (5.8%), 2 (4.2%) males and 2 (9.5%) females. Adenocarcinoma constituted about 94.2%, of which the intestinal type was 87.5% and the diffuse type was 12.5%. The non-epithelial tumor was encounter 4.3%, of which 2.9% were lymphoma and 1.4% were GIST. Conclusion: In our studied patients, proximally located gastric cancer was the most common in both sexes.
Etiological Profile of Patients Presenting with Lower Gastrointestinal Bleeding in Ibb Governorate-Yemen  [PDF]
Abdulgafoor Kassim, Khalid Al-Qubaty, Ramea Alathwary, Sana Ameen
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104683
Objectives: To investigate the causes of lower gastrointestinal bleeding (LGIB) in Yemeni patients and to compare our results with the results of other studies. Design: Prospective study of patients with overt LGIB during the period from April 2017 to March 2018. Setting: Specialized center of gastrointestinal and liver diseases in Ibb city, Yemen. Subjects & Method: Consecutive patients who presented or referred to our center with LGIB to whom lower GI endoscopy was performed. Results: During the study period, we had 122 patients with LGIB, 72 were males and 50 were females, with male:female ratio of 1.4:1 The age ranged between 5 and 82 years and the mean age was 45 ± 17.99 years. The clinical presentations of our patients included hematochezia in 72.1%, abdominal pain in 51.7%, diarrhea in 43.3%, pallor, and anemia in 40.2%, weight loss in 39.3%, constipation in 16.4%, bloody diarrhea in 16.4%, and melena in 5.7%. The most common colonoscopic findings were hemorrhoids in 36.7% followed by colon cancer in 19.7% and nonspecific colitis in 15.6%. Conclusion: Hemorrhoids and colon cancer were the most common causes of lower GI bleeding in our patients.
Comparison of the Bayesian Methods on Interval-Censored Data for Weibull Distribution  [PDF]
Al Omari Mohammed Ahmed
Open Journal of Statistics (OJS) , 2014, DOI: 10.4236/ojs.2014.48053
Abstract: This study considers the estimation of Maximum Likelihood Estimator and the Bayesian Estimator of the Weibull distribution with interval-censored data. The Bayesian estimation can’t be used to solve the parameters analytically and therefore Markov Chain Monte Carlo is used, where the full conditional distribution for the scale and shape parameters are obtained via Metropolis-Hastings algorithm. Also Lindley’s approximation is used. The two methods are compared to maximum likelihood counterparts and the comparisons are made with respect to the mean square error (MSE) to determine the best for estimating of the scale and shape parameters.
Solving the Three-Dimensional Palet-Paking Problem Using Mixed 0 - 1 Model  [PDF]
Adel Mohammed Al-Shayea
Journal of Service Science and Management (JSSM) , 2011, DOI: 10.4236/jssm.2011.44059
Abstract: The distribution of Pallet Packing Problem is to load a set of distinct boxes with given dimensions on pallets or in con- tainers to maximize volume utilization. This problem is still in its early stages of research, but there is a high level of interest in developing effective models to solve this NP-hard problem to reduce the time, energy and other resources spent in packing pallets. In this paper, the three-dimensional pallet loading with mixed box sizes model has been developed. This loading model allows many boxes of various sizes to be placed onto the same pallet. The model also considers the number or proportion of each box size that can be loaded on a pallet. No restrictions are placed on the dimensions of the boxes, the pallets, or the number of different box sizes that can be considered. Therefore, the objective of this work is to determine how to most efficiently load a given pallet by maximizing the volume occupied by its load of boxes. Tests on several problems were implemented using OR library in order to show the validation of the proposed model. The results showed that the formulated mixed 0 - 1 models provide exact solutions for the pallet-packing problem. The computational time requirements of the developed model prevent its use in real-time palletizing applications. As microcomputer chip technology continues to evolve the lengthy computation time may prove to be less of a problem in real time applications.
Reliability Index of Tall Buildings in Earthquake Zones  [PDF]
Mohammed S. Al-Ansari
Open Journal of Earthquake Research (OJER) , 2013, DOI: 10.4236/ojer.2013.23005

The paper develops a reliability index approach to assess the reliability of tall buildings subjected to earthquake loading. The reliability index β model measures the level of reliability of tall buildings in earthquake zones based on their response to earthquake loading and according to their design code. The reliability index model is flexible and can be used for: 1) all types of concrete and steel buildings and 2) all local and international codes of design. Each design code has its unique reliability index β as a magnitude and the interaction chart corresponding to it. The interaction chart is a very useful tool in determining the building drift for the desired level of reliability during the preliminary design of the building members. The assessments obtained using the reliability index approach of simulated, tested, and actual buildings in earthquake zones were acceptable as indicators of the buildings reliability.

Down Scaling Interest in Interest Rate  [PDF]
Mohammed H. S. Al Ashry
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.51012
Abstract: During periods of high interest rates, businesses utilize their own capital, merge with other businesses, or diversify, and borrow when it is absolutely necessary. People also avoid hardship through refinancing during economic slowdowns because interest rates are low enough to recover some of their income and lower debt interest. High interest rates are more inviting to investments although hard to sustain in the long run. The future looks grim and interest rates have been down for a while, and will probably stay down for some time to come. This paper investigates ways to lower the earnings percentage in interest rates. A new set of the uniform series of the future worth of money involving linear gradients will be mathematically reformulated to investigate the possibility of lowering the interest rate for long term loans and mortgages. A new equation will be formulated and put into a tabulated practical example.
Large Scale Desalination: A Comparative Cost Affective Economic Analyses of Nuclear, Gas and Solar Powered Plants  [PDF]
Mohammed H. S. Al Ashry
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.51015
Abstract: The main objective, here, is to explore the economic viability of the solar powered desalination method through a cost and benefit comparative and contrast study. Using the initial construction expenditure, the annual maintenance cost and energy consumed or produced, a variance ratio test of the random walk hypothesis will be implemented to determine their relative financial efficiency. This paper will also utilize the first order autoregressive multivariate estimation model to analyze the methods and identify the most productive process with most financial promise for future investment. The total deviations of the estimated variables from the actual are accounted for by the variations of the variances of the estimates from the actual. The higher the percentage of the unexplained deviation, the higher the risk involved. The portfolio variance will be utilized to measure the investment risk in three desalination industries.
Augmenting the Heat Sink for Better Heat Dissipation  [PDF]
Mohammed H. S. Al Ashry
Circuits and Systems (CS) , 2015, DOI: 10.4236/cs.2015.62003
Abstract: Heat sinks were invented to absorb heat from an electronic circuit conduct, and then to dissipate or radiate this heat to the surrounding supposedly, ventilated space, at a rate equal to or faster than that of its buildup. Ventilation was not initially recognized as an essential factor to thermal dispersion. However, as electronic circuit-boards continued to heat up, circuit failure became a problem, forcing the inclusion of miniaturized high speed fans. Later, heat sinks with fins and quiet fans were incorporated in most manufactured circuits. Now heat sinks come in the form of a fan with fans made to function as fins to disperse heat. Heat sinks absorb and radiate excess heat from circuit-boards in order to prolong the circuit’s life span. The higher the thermal conductivity of the material used the more efficient and effective the heat sink is. This paper is an attempt to theoretically design a heat sink with a temperature gradient lower than that of the circuit board’s excess heat.
A Study on Influence of Motivation Factors on Employees Performance in Private Schools in Saudi Arabia  [PDF]
Mohammed Al Doghan, Sukaina Albar
Journal of Human Resource and Sustainability Studies (JHRSS) , 2015, DOI: 10.4236/jhrss.2015.34024
Abstract: The main purpose of the study is to assess the role of work motivation on employee’s performance level in private schools in Saudi Arabia. The research aims to determine the factors that affect employees’ motivation and its impact on job performance. In recent years, research showed that there was a direct relation between employees’ motivation and business performance. In the field of education, which is a service business, it is very important for business profit and productivity to identify motivational factors that increase employees’ performance. The research is based on a quantitative research method. The data in this research were mainly obtained by using questionnaires. Moreover, the research was conducted on a selection of private schools in Dammam that are located in the Eastern Province of Saudi Arabia. 150 employees were selected as a sample from three different schools. Only 119 questionnaires were suitable for a statistical analysis that equals to 79% of the total sample. The data were collected via a questionnaire covering four variables such as leadership style, organizational environment, salary, and stable future. The research tested the effect of these variables mentioned above on employees’ performance.
Enhancement of Workability of Cement-Poor Concrete by Optimizing Paste Content  [PDF]
Mohammed Hatem Mohammed, Nadhir Al-Ansari, Sven Knutsson
Engineering (ENG) , 2014, DOI: 10.4236/eng.2014.613080
Abstract: This study describes the performance of concrete in fresh state, intended for sealing deep bore-holes in the host rock of radioactive repositories. Set of different paste volumes, combinations of water-to-powder ratios and fine aggregate contents have been performed within the frame of this study. The main objective was to search for tendencies, logical connections and phenomena that occur for different combination of materials regarding the fluidity and segregation and mainly the effect from the (paste) or fine aggregate content. It shall be pointed out that this investigation is a suggestion on how concrete can be optimized using two simple test methods based on changing the paste content. The results highlighted the importance of having sufficient amounts of filler and cement paste for separate and carry larger particles, which gives the concrete good workability and fluidity at casting. It was concluded that the slump behaviors can be optimized based on the adjustments of the superplastisizer dosage.

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