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State-of-the-art review of some artificial intelligence applications in pile foundations

Geoscience Frontiers 2016年第1期7卷 33-44页

作者： mohamed A.shahin Department of Civil Engineering Curtin University

Geotechnical engineering deals with materials（e.g. soil and rock） that, by their very nature, exhibit varied and uncertain behavior due to the imprecise physical processes associated with the formation of these materials. Modeling the behavior of such materials in geotechnical engineering applications is complex and sometimes beyond the ability of most traditional forms of physically-based engineering methods. Artificial intelligence（AI） is becoming more popular and particularly amenable to modeling the complex behavior of most geotechnical engineering applications because it has demonstrated superior predictive ability compared to traditional methods. This paper provides state-of-the-art review of some selected AI techniques and their applications in pile foundations, and presents the salient features associated with the modeling development of these AI techniques. The paper also discusses the strength and limitations of the selected AI techniques compared to other available modeling approaches.

关键词： Artificial intelligence Pile foundations Artificial neural networks Genetic programming Evolutionary polynomial regression

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Infantile Hemangiopericytoma: Two Cases Report and Literature Review

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Surgical Science 2011年第7期2卷 379-384页

作者： Gamal Al-Saied Amin Abokifa mohamed Al-Saeed mohamed Abdul Aziz Medhat Ibrahim Moemen Hafez Tharwat Hussain mohamed shahin Dalal Nemenqani Naglaa Fawzy 不详

Hemangiopericytoma is a rare vascular tumour of infants. Although generally considered to be benign, local recurrence and metastases can occur. Herein, we report on two full term girls, delivered with lumbosacral swelling and left thigh swelling respectively. Complete surgical excision with safety margins was performed for each lesion. Histologic examination of both lesions showed picture of infantile hemangiopericytoma. There is no evidence of local recurrence or distant metastasis during last 20 and 17 months for 1st case and 2nd case respectively. In conclusion;most infantile hemangiopericytoma follow a benign course. Rarely these tumours behave aggressively with local infiltration, recurrences and even distant metastases. Careful follow up is therefore essential.

关键词： Infantile Hemangiopericytoma Vascular Tumour

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Infantile Hemangiopericytoma: Two Cases Report and Literature Review

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Surgical Science（外科学） 2011年第7期

作者： Gamal Al-Saied Amin Abokifa mohamed Al-Saeed mohamed Abdul Aziz Medhat Ibrahim Moemen Hafez Tharwat Hussain mohamed shahin Dalal Nemenqani Naglaa Fawzy

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Numerical Investigation of Rotating Stall in Centrifugal Compressor with Vaned and Vaneless Diffuser

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Journal of Thermal Science 2015年第4期24卷 323-333页

作者： Taher Halawa mohamed Alqaradawi mohamed S.Gadala Ibrahim shahin Osama Badr Mechanical Engineering Department UBC-University of British ColumbiaVancouverB.C.Canada Mechanical Engineering Department Cairo University Mechanical & Industrial Engineering Department Qatar University Mechanical Engineering Department Abu Dhabi University Mechanical and Industrial Engineering Department Qatar UniversityDohaQatar Mechanical Engineering Department Benha University Mechanical Engineering Department British University

This study presents a numerical simulation of the stall and surge in a centrifugal compressor and presents a description of the stall development in two different *** first case is for a compressor with vaneless diffuser and the second is for a compressor with vaned diffuser of the vane island *** main aim of this study is to compare the flow characteristics and behavior for the two compressors near the surge operating condition and provide further understanding of the diffuser role when back flow occurs at *** showed that for a location near the diffuser entrance,the amplitude of the static pressure fluctuations for the vaneless diffuser case is higher than that for the vaned diffuser case near surge *** pressure fluctuations in the case of the vaneless diffuser appear with a gradual decrease of the mean pressure value as a part of the surge *** for the case of the vaned diffuser,the pressure drop during surge occurs faster than the case of the vaneless ***,results indicated that during surge in the case of vaneless diffuser,there is a region with low velocity and back flow that appears as a layer connecting all impeller passages near shroud surface and this layer develops in size with *** the other hand,for the case of vaned diffuser during surge,the low velocity regions appear in random locations in some passages and these regions expand with time towards the shroud *** showed that during stall,the impeller passages are exposed to identical impact from stall cells in the case of vaneless diffuser while the stall effect varies from passage to another in the case of the vaned diffuser.

关键词： centrifugal compressors rotating stall surge vaneless diffuser vaned diffuser

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Evaluation of copper removal efficiency using water treatment sludge

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Water Science and Engineering 2019年第1期12卷 37-44页

作者： Shimaa A.shahin mohamed Mossad Moharram Fouad Public Works Engineering Department Faculty of Engineering Mansoura University

Large quantities of sludge are produced during water treatment processes. Recently, sludge has been treated as waste and disposed of in landfills, which increases the environmental burdens and the operational cost. Therefore, sludge reuse has become a significant environmental issue. In this study, adsorption of copper ions (Cu^2+) onto calcined sludge was investigated under various operational conditions (with varying temperature, Cu^2+ initial concentration, pH, and sludge dosage). The prepared sludge material was characterized with transmission electron microscopy (TEM), X-ray diffraction (XRD), dynamic light scattering (DLS), and Brunauer-Emmett-Teller (BET) surface area. The sorption capacity of sludge was directly proportional to the initial Cu^2+ concentration and inversely proportional to the sludge dosage. The optimum operational pH and solution temperature were 6.6 and 80℃, respectively. The experimental results followed a Langmuir isotherm and pseudo-first-order adsorption kinetics. Thermodynamic parameters such as activation energy, change in free energy, enthalpy, and entropy were calculated. Thermodynamic analyses indicated that the sorption of copper ions onto the calcined sludge was driven by a physical adsorption process. The prepared sludge was proven to be an excellent adsorbent material for the removal of Cu^2+ from an aqueous solution under optimum conditions.

关键词： Copper removal Adsorption Sludge Water treatment plant Operational conditions

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Place of upper endoscopy before and after bariatric surgery: A multicenter experience with 3219 patients

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World Journal of Gastrointestinal Endoscopy 2016年第10期8卷 409-417页

作者： mohamed E Abd Ellatif Haitham Alfalah Walid A Asker Ayman E El Nakeeb Alaa Magdy Waleed Thabet mohamed A Ghaith Emad Abdallah Rania shahin Asharf Shoma Ibraheim E Dawoud Ashraf Abbas Asaad F Salama Maged Ali Gamal Department of Surgery Mansoura University Hospital Consultant of Bariatric Surgery King Saud Medial City (KSMS) Gastroenterology Surgical Center Mansoura University Department of Anesthesia Mansoura University Hospital Department of Clinical Pathology Benha University Hospital Department of Surgery Jahra Hospital

AIM: To study the preoperative and postoperative role of upper esophagogastroduodenoscopy(EGD) in morbidly obese patients. METHODS: This is a multicenter retrospective study by reviewing the database of patients who underwent bariatric surgery(laparoscopic sleeve gastrectomy, laparoscopic Roux en Y gastric bypass, or laparoscopic minigastric bypass) in the period between 2001 June and 2015 August(Jahra Hospital-Kuwait, Hafr Elbatin Hospital and King Saud Medical City-KSA, and Mansoura University Hospital- Egypt). Patients with age 18-65 years, body mass index(BMI) > 40, or > 35 with comorbidities after failure of many dietetic regimen and acceptable levels of surgical risk were included in the study after having an informed signed consent. We retrospectively reviewed the medical charts of all morbidly obese patients. The patients' preoperative data included clinical history including upper digestive symptoms and preoperative full workup including EGD. Only patients whose charts revealed weather they were symptomatic or not were studied. We categorized patients accordingly into two groups; with(group A) or without(group B) upper digestive symptoms. The endoscopic findings were categorized into 4 groups based on predetermined criteria. The medical record of patients who developed stricture, leak or bleeding after bariatric surgery was reviewed. Logestic regression analysis was used to identify preoperative predictors that might be associated with abnormal endoscopic findings. RESULTS: Three thousand, two hundred and nineteen patients in the study period underwent bariatric surgery(75% LSG, 10% LRYDB, and 15% MGB). Mean BMI was 43 ± 13, mean age 37 ± 9 years, 79% were female. Twenty eight percent had presented with upper digestive symptoms(group A). EGD was considered normal in 2414(75%) patients(9% group A vs 66% group B, P = 0.001). The abnormal endoscopic findings were found high in those patients with upper digestive symptoms. Abnormal findings(one or more) were fo

关键词： Morbid obesity Obesity surgery Endoscopy Complications Dilation Stenting

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