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Effect of front guide nozzle shape on the flow characteristics in an augmentation channel of a direct drive turbine for wave power generation

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Science China(Technological Sciences) 2010年第1期53卷 46-51页

作者： Deepak PRASAD mohammed Asid ZULLAH mohammed Rafiuddin ahmed Young-Ho LEE Graduate School Korea Maritime University1 Dongsam-dong Youngdo-kuBusan606-791Republic of Korea Division of Mechanical Engineering University of the South PacificPrivate Mail BagLaucala CampusSuvaFiji Islands Division of Mechanical & Information Engineering Korea Maritime University1 Dongsam-dong Youngdo-kuBusan606-791Republic of Korea

There is an increasing interest in cross flow turbines(also known as Banki turbines) for small and low head applications because of their simple structure as well as low capital and maintenance *** present work aims at implementing the direct drive turbine(DDT) of cross flow type for wave power generation.A numerical wave tank was used to simulate the waves and after obtaining the desired wave properties;the augmentation channel plus the front guide nozzle and rear chamber were integrated to the numerical wave *** waves in the numerical wave tank were generated by a piston type wave maker which was located at the wave tank *** inlet which was modeled as a plate wall moved sinusoidally with the general function x = asinω *** augmentation channel consisted of a front nozzle,rear nozzle and an internal fluid region which represented the turbine *** front and rear nozzles were geometrically the *** different front guide nozzle configurations were studied:a standard guide nozzle which was originally attached to the augmentation channel and two other front guide nozzles of different *** purpose of this study is to observe how the front guide nozzle shape influences the flow downstream,mainly in the augmenta-tion channel,water power and the first stage energy *** analysis was performed using a commercial CFD code *** results of the flow in the augmentation channel for the three front guide nozzles are presented in this paper.

关键词： numerical wave tank wave power augmentation channel direct drive turbine water power

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Diagnosing Breast Cancer Accurately Based on Weighting of HeterogeneousClassification Sub-Models

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Computer Systems Science & Engineering 2022年第9期42卷 1257-1272页

作者： Majdy Mohamed eltayeb eltahir Tarig mohammed ahmed Department of Information Systems College of Science&Arts at MahayilKing Khalid UniversityMuhayel Aseer62529Kingdom of Saudi Arabia Department of Information Technology Faculty of Computing and Information TechnologyKing Abdul-Aziz UniversityJeddah21589Kingdom of Saudi Arabia Department of Computer Sciences Faculty of Mathematical Sciences and InformaticsUniversity of KhartoumKhartoum11115Sudan

In developed and developing countries, breast cancer is one of the leading forms of cancer affecting women alike. As a consequence of growing lifeexpectancy, increasing urbanization and embracing Western lifestyles, the highprevalence of this cancer is noted in the developed world. This paper aims todevelop a novel model that diagnoses Breast Cancer by using heterogeneous datasets. The model can work as a strong decision support system to help doctors tomake the right decision in diagnosing breast cancer patients. The proposed modelis based on three datasets to develop three sub-models. Each sub-model worksindependently. The final diagnosis decision is taken by the three sub-models independently. The power of the model comes from the diversity checks of patientsand this reduces the risk of wrong diagnosing. The model has been developedby conducting intensive experiments. Several classification algorithms were usedto select the best one in each sub-model. As the final results, the sub-modelaccuracies were 72%, 74% and 97%.

关键词： Breast cancer data mining classification

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Performance analysis of a wave energy converter using numerical simulation technique

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Science China(Technological Sciences) 2010年第1期53卷 13-18页

作者： mohammed Asid ZULLAH Deepak PRASAD mohammed Rafiuddin ahmed Young-Ho LEE Graduate School Korea Maritime University Dongsam-dong Youngdo-kuBusan 606-791Republic of Korea Division of Mechanical Engineering University of the South PacificPrivate Mail BagLaucala CampusSuvaFiji Islands Division of Mechanical & Information Engineering Korea Maritime UniversityDongsam-dong Youngdo-kuBusan 606-791Republic of Korea

A general purpose viscous flow solver Ansys CFX was used to study a Savonius type wave energy converter in a 3D numerical viscous wave *** paper presents the results of a computational fluid dynamics(CFD) analysis of the effect of blade configuration on the performance of two Savonius rotors for wave energy extraction.A piston-type wave generator was incorporated in the computational domain to generate the desired incident waves.A complete OWC system with a 3-bladed Savonius rotor was modeled in a three dimensional numerical wave tank and the hydrodynamic conversion efficiency was *** flow over the rotors was assumed to be two-dimensional(2D),viscous,turbulent and *** CFX code was used with a solver of the coupled conservation equations of mass,momentum and energy,with an implicit time scheme and with the adoption of the hexahedral mesh and the moving mesh techniques in areas of moving *** was modeled with the k-e *** results indicated that the developed models are suitable to analyze the water flows both in the chamber and in the *** the turbine,the numerical results of pressure and torque were compared for the two cases.

关键词： wave energy Ansys CFX code Savonius rotor numerical simulation torque efficiency

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Characterization of Egyptian Manganese Ores for Production of High Carbon Ferromanganese

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Journal of Minerals and Materials Characterization and Engineering 2013年第2期1卷 68-74页

作者： mohammed Salah Fahim Hoda el Faramawy Azza mohammed ahmed Saaed Nabil Ghali abd el Hakim Taha Kandil Department of Chemistry Faculty of Science Helwan University Cairo Egypt Department of Steel and Ferroalloys Technology Central Metallurgical Research and Development Institute (CMRDI) Cairo Egypt

This work aims at studying the reactivity of Egyptian manganese ores to be used in the production of ferromanganese alloys in submerged electric arc furnace. Ores with different manganese content (high-medium and low) were selected and characterized by X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD) and Scanning electron Microscope (SEM). The main mineralogical compositions in the three ores are pyrolusite (MnO2) and hematite (Fe2O3). Porosity of selected Mn ores was determined. The reactivity of the different ores was carried out through pre-reduction of the selected ores using thermobalance at 900°C and 1100°C and mixture of CO and CO2 gases. The reduction process was done until steady weight. The reduced ores were examined using XRD and SEM. The results showed that pyrolusite in high and medium ores are converted completely to MnO at 1100°C. However, the ore with low manganese content was converted to MnO and Mn3O4. Consequently, it is clear from the results that Mn ores with high and medium MnO2 content are more reactive than those with low MnO2. Therefore, high MnO2 content Mn ores are preferable to get good economic impact during the production of high carbon ferromanganese.

关键词： High Carbon Ferromanganese Manganese Ores Ore Reactivity CO Reduction Porosity

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Moderate Secondary Tricuspid Regurgitation: Does It Worth More Time to Conserve?

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Open Journal of Thoracic Surgery 2021年第3期11卷 59-68页

作者： Montaser elsawy abd elaziz ahmed Labib Dokhan Awny Gamal Shalaby Hesham Hassan ahmed mohammed ahmed el-Hag-Aly mohammed Fawzy eltaweel Cardithoracic Surgery Department Faculty of Medicine Menoufia University Menoufia Egypt Faculty of Medicine Jazan University Jazan KSA Cardiology Department Faculty of Medicine Menoufia University Menoufia Egypt

Background: Concomitant repair of moderate secondary tricuspid regurgitation (STR) during mitral valve surgery is still subject of controverse. This research aims to study the early and mid-term postoperative influence of tricuspid repair on the clinical outcomes and right ventricular functions. Methods: This is a retrospective cohort study of 92 patients with moderate STR who underwent tricuspid valve repair

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The effects of cross-diffusion and radiation on mixed convection from a vertical flat plate embedded in a fluid-saturated porous medium in the presence of viscous dissipation

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Propulsion and Power Research 2016年第2期5卷 149-163页

作者： mohammed A.mohammed ahmed mohammed E.mohammed ahmed A.Khidir Faculty of Technology of Mathematical Sciences and Statistics Alneelain UniversityP.O.Box 12702KhartoumSudan

In this paper,we propose a new application of a recent semi-numericalsuccessive linearization method(SLM)in solving highly coupled,nonlinear boundaryvalue *** method is presented in detail by solving the problem of steady flowof mixed convection and an incompressible viscous hydromagnetic fluid from a verticalflat plate embedded in a fluid-saturated porous *** governing partial differentialequations are transformed into a system of ordinary differential equations and then solvedby *** effects of different physical parameters on the velocity,temperature,andconcentration profiles are determined and *** skin-friction,and heat and masstransfer coefficients have been obtained and analyzed for various physical *** results are presented numerically through graphs and tables for both assistingand opposing flows to observe the effects of various parameters encountered in the equations.

关键词： Successive linearization method Mixed convection Cross-diffusion Heat and mass transfer Viscous dissipation

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On linearization method to MHD boundary layer convective heat transfer with low pressure gradient

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Propulsion and Power Research 2015年第2期4卷 105-113页

作者： mohammed A.mohammed ahmed mohammed E.mohammed ahmed A.Khidir Faculty of Technology of Mathematical Sciences and Statistics Alneelain UniversityKhartoumP.O.Box 12702Sudan

The paper highlights the application of a recent semi-numerical successive linearization method(SLM)in solving highly coupled,nonlinear boundary value *** method is presented in detail by solving the problem of boundary layer convective heat transfer with low pressure gradient in the presence of viscous dissipation and radiation *** effects of the parameters on the flow are *** velocity,temperature,skinfriction,and heat transfer coefficients have been obtained and discussed for various physical parametric values.

关键词： Successive linearization method Magnetohydrodynamics(MHD) Boundary layer convective heat transfer Pressure gradient Viscous dissipation

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Laparoscopic Rectopexy;Is It Useful for Persistent Rectal Prolapse in Children?

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Surgical Science 2014年第3期5卷 128-133页

作者： Medhat M. Ibrahim mohammed abd el Razik ahmed M. abdelkader General Surgery Unite RCMC Yanbu Industrial City KSA Pediatric Surgery Unit Faculty of Medicine Al-Azhar University Nasr City Cairo Egypt

Introduction: Rectal prolapse is a relatively common, usually self-limiting illness in children. Peak incidence is between 1 and 3 years. The intervention is required for the persistent rectal prolapse (PRP). Only scanty experience is available with laparoscopic rectopexy in children. There is no available work using both mesh and suture laparoscopic rectopexy in literature. This work is unique that it presents our clinical experience with both mesh and suture laparoscopic rectopexy in children. This is a prospective clinical study for the outcome of laparoscopic rectopexy (LRP) by both mesh and suture technique in children with persistent rectal prolapse (PRP). Materials and Methods: Fourteen cases of PRP were managed with LRP from February 2008 to August 2012. Results: Of the 14 children, 10 (71.42%) were males and 4 (28.57%) were females. Male to female ratio was 2:1. The mean age of presentation was 5 years (range 3 - 8 years). The presenting complaints were mass descending per rectum along with bleeding per rectum lasting from 1 to 3 years. All had rectal prolapse of 5 - 7 cm in length. 12 out of 14 children had recurrence even after sclerotherapy before referral to laparoscopic rectpexy. The mean duration of surgery was 30 minutes (range 20 - 60 minutes). No intraoperative complications were reported;only one case got constipation and was managed conservatively and no recurrence. Conclusion: LRP is safe, feasible in children and gives satisfactory results after failure of all conservative even sclerotherapy injection.

关键词： Rectal Prolapse Laparoscopy Rectopexy

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Predictors of Recurrence of Hepatocellular Carcinoma after Transarterial Chemoembolization: Role of Hepatocyte Growth Factor

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Open Journal of Gastroenterology 2020年第6期10卷 151-165页

作者： Amr Mohamed Zaghloul ahmed Sedky Ali Hussein mohammed Samer A. el-Sawy ahmed abd el Rady ahmed Emad eldin Nabil Tropical Medicine and Gastroenterology Department Sohag University Sohag Egypt Department of Clinical Pathology Sohag University Sohag Egypt Department of Internal Medicine Sohag University Sohag Egypt Biochemistry Department Sohag University Sohag Egypt Interventional Radiology Department Alazhar University (Assuit Branch) Assuit Egypt Department of Oncology Sohag University Sohag Egypt

Background: Hepatocellular carcinoma is the third leading cause of tumor related mortality and develops mostly in patients with chronic liver disease and liver cirrhosis. Human hepatocyte growth factor (HGF) is produced in various organs of the body and is characterized as a multifunctional factor with various biologic activities. Aim: Our aim was to investigate the predictive factors of recurrence specially the role of HGF in patients with HCC treated with TACE. Patients and Methods: one hundred HCC patients treated by TACE who achieved complete response were included and divided into two groups according to disease free survival (DFS) status at 1 year: the non-early recurrence (NER) group (1) and the early recurrence (ER) group (2). Univariate binary logistic regression analysis for the possible risk factors of recurrence showed that AFP, multinodularity and HGF level were significant. Conclusion: high AFP, multinodularity and high HGF were inter-related possible risk factors for

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Techno-Economic Analysis of a Grid-Connected Waste to Energy Gasification Plant:A Case Study

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Energy Engineering 2021年第6期118卷 1681-1701页

作者： ahmed Abubakar elwan mohammed Hafiz Habibuddin Department of electrical Power Engineering Universiti Teknologi MalaysiaJohor Bahru81310Malaysia

With population growth around the world,municipal waste disposal and continued energy demand becomes some of the major challenges to deal *** order to address these,an approach is required for an optimal waste management system that offers the population benefit with a lower environmental *** study evaluates the technical-economic and environmental impact analysis of a grid-connected waste to energy(WtE)plant to power a Univerisiti Teknologi Malaysia(UTM)*** energy recovery potential of the waste stream was assessed using the life cycle assessment(LCA)method with GaBi^(TM) software(version 4).A technical,economic and environmental analysis was then carried out for the grid-connected WtE system using HOMERPro software with gasification conversion *** cash flow analysis was based on levelized costs of energy(LCOE)and total net present value(NPV).The results gave an NPV for the system at USD 1.11×10^(7),with most of the effects resulting from the grid operating costs and the LCOE of USD 0.43/kWh compared to the grid unit price of USD 0.7/kWh which corresponds to a saving of$0.27/kWh in energy *** an environmental point of view,the results showed a significant reduction in carbon dioxide emissions from around 2,000 tons per year to around 400 tons per *** regard to the amount of waste sent to landfills,the results show a significant improvement from 142,605.5 kg/year to 0.13 kg/year.

关键词： Waste to energy techno-economic analysis solid waste gasification

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