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Impact Assessment and Mitigation Techniques for High Penetration Levels of Renewable Energy Sources in Distribution Networks:Voltage-control Perspective

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Journal of Modern Power Systems and Clean Energy 2022年第2期10卷 450-458页

作者： ahmed S.A.Awad Dave Turcotte tarek H.M.El-Fouly Natural Resources Canada Can-metENERGYVarennesCanadaon leave from the Electrical Power and Machines DepartmentFaculty of EngineeringAin Shams UniversityCairo 11566Egyp Natural Resources Canada CanmetENERGYVarennesCanada Advanced Power and Energy Center Khalifa UniversityAbu DhabiUnited Arab Emirates

The integration of renewable distributed generation(RDG)into distribution networks is promising and increasing ***,high penetration levels of distributed generation(DG)are often limited as they may have an adverse effect on the operation of distribution *** of the operation challenges is the interaction between DG and voltage-control equipment,e.g.,an under-load tap changer(ULTC),which is basically designed to compensate for voltage changes caused by slow load *** integration of variable DGs leads to rapid voltage fluctuations,which can negatively affect the tap operation of *** paper investigates the impact of high penetration levels of RDG on the tap operation of ULTC in distribution networks through *** mitigation techniques that can alleviate this impact are also *** these techniques,constant power-factor mode is regarded as the best trade-off between the simplicity and effectiveness of minimizing the number of tap *** are performed on a Canadian benchmark rural distribution feeder using OpenDSS software.

关键词： Renewable energy distributed generation(DG) voltage regulator load tap changer distribution network.

Steady State Simulation of a Novel Process for the Co-production of Vinyl Acetate and Acetic Acid

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Journal of Chemistry and Chemical Engineering 2011年第1期5卷 30-36页

作者： Hadir Wahid Fawzy fouad tarek M. Moustafa ahmed Soliman Department of Chemical Engineering Cairo University Egypt

A new process for the co-production of vinyl acetate monomer and acetic acid from ethane feedstock was studied. Various configurations were proposed and simulation results were given for each case to optimize process variables. This new process offers an overall yield values above 70% with minimum separation steps involved and the possibility of utilities integration. The process does not involve any CO production, thus becoming environmentally more favorable. The initial capital investment of the proposed process is much lower compared to the conventional route.

关键词： Vinyl acetate acetic acid ethane ethylene.

A WBAN for Human Movement Kinematics and ECG Measurements

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E-Health Telecommunication Systems and Networks 2012年第2期1卷 19-25页

作者： ahmed Baraka ahmed Shokry Ihab Omar Saged Kamel tarek fouad Mohamad Abou El-Nasr Heba Shaban Arab Academy for Science Technology & Maritime Transport (AASTMT) P.O. Box 1029 Abu Kir Campus Alexandria Egypt

Biomedical applications of body area networks (BANs) are evolving, where taking periodic medical readings of patients via means wireless technologies at home or in the office will aid physicians to periodically supervise the patient’s medical status without having to see the patient. Thus, one important objective of BANs is to provide the doctor with the medical readings that can be collected electronically without being in close proximity to the patient. This is done through the measurement of the patient’s physiological signals via means of wearable sensors. This paper investigates wireless BAN cooperation via actual measurements of human movement kinematics and electrocardiogram (ECG), which are believed to provide patients with easy healthcare for continuous health-monitoring. The collected information will be processed using specially designed software, which in turn will enable the patient to send a full medical chart to the physician’s electronic device. In this way, physicians will have the ability to monitor their patients more efficiently.

关键词： Body Area Networks (BANs) Electrocardiogram (ECG) Human Gait and Movement Kinematics

Trends and outcomes of pancreaticoduodenectomy for periampullary tumors: A 25-year single-center study of 1000 consecutive cases

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World Journal of Gastroenterology 2017年第38期23卷 7025-7036页

作者： ayman el nakeeb waleed askar ehab atef ehab el hanafy ahmad m sultan tarek salah ahmed shehta mohamed el sorogy emad hamdy mohamed el hemly ahmed a el-geidi tharwat kandil mohamed el shobari talaat abd allah amgad fouad mostafa abu zeid ahmed abu el eneen nabil gad el-hak gamal el ebidy omar fathy ahmed sultan mohamed abdel wahab gastroenterology surgical center mansoura university

AIM To evaluate the evolution, trends in surgical approaches a n d r e c o n s t r u c t i o n t e c h n i q u e s, a n d i m p o r t a n t lessons learned from performing 1000 consecutive pancreaticoduodenectomies(PDs) for periampullary *** This is a retrospective review of the data of all patients who underwent PD for periampullary tumor during the period from January 1993 to April 2017. The data were categorized into three periods, including early period(1993-2002), middle period(2003-2012), and late period(2013-2017).RESULTS The frequency showed PD was increasingly performed after the year 2000. With time, elderly, cirrhotic and obese patients, as well as patients with uncinate process carcinoma and borderline tumor were increasingly selected for PD. The median operative time and postoperative hospital stay decreased significantly over the periods. Hospital mortality declined significantly, from 6.6% to 3.1%. Postoperative complications significantly decreased, from 40% to 27.9%. There was significant decrease in postoperative pancreatic fistula in the second 10 years, from 15% to 12.7%. There was a significant improvement in median survival and overall survival among the *** Surgical results of PD significantly improved, with mortality rate nearly reaching 3%. Pancreatic reconstruction following PD is still debatable. The survival rate was also improved but the rate of recurrence is still high, at 36.9%.

关键词： Pancreaticoduodenectomy Pancreaticogastrostomy Pancreaticojejunostomy Postoperative pancreatic fistula Periampullary tumor

Effect of Oxygen Therapy by Venturi Mask versus Non Invasive Ventillation on the Outcome of Patients Who Devolope Hypoxia after Open Heart Surgery

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Open Journal of Anesthesiology 2018年第9期8卷 241-254页

作者： Yousry El-Saied Rizk tarek Samy Essawy ahmed Hamdy Abd Elrahman Ali Mohamed ahmed El-Gazzar Abdelkhalek fouad Mahmoud Cardiothoracic Surgery and Department of Critical Care Medicine Faculty of Medicine Benha University Egypt Department of Chest Benha University Hospital Benha Egypt Anesthesia and Intensive Care Department Benha Egypt Cardiothoracic Surgery Benha University Benha Egypt Internal Medicine Ministry of Health Cairo Egypt

Background: Cardiothoracic surgery is a common cause of acute respiratory failure and is associated with increased morbidity and mortality. We aimed to compare the outcomes of open heart surgery patients treated using oxygen delivery devices with patients who receive NIV as a first-line therapy for hypoxemic respiratory failure. Materials and Methods: 40 patients who developed acute hypoxemic respiratory failure after open heart surgery and admitted to cardiothoracic ICU 20 patients received NIV and 20 patient received oxygen by venture mask. For all patients the following measurements were performed before and after CPAP AND Venture use: CBC, blood urea, serum creatinine body temperature, chest X-ray, Arterial blood gases (arterial pH, sodium bicarbonate, pcO2, SpO2 and PaO2-to-FiO2 ratio). Results: Mean PO2 and SO2 have increased after using of both venture and Cpap, increase in both PCO2 and HCO3 levels after using Venturi mask, CPAP mask was superior to venturi mask in avoiding the need of intubation, decreasing The ICU stay median length and also median length of hospitalization, all were lower in CPAP group than venture group. Also the mortality rate was lower in CPAP group than the venturi group. Conclusion: Using CPAP mask in severe AHRF following open heart surgery can avoid intubation, decreases the levels of tachypnea and arterial hypoxemia, decreases ICU stay, the length of hospitalization and also decreases the mortality rate compared with patients receiving high-concentration oxygen therapy with venture mask.

关键词： Open Heart Surgery Venture Mask CPAP Mask Non Invasive Ventilation O2 Therapy

Treatment Outcome of Pharmacokinetics-Based Dosing of Docetaxel and Fluorouracil in Advanced Head and Neck Cancer Patients

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Journal of Cancer Therapy 2018年第12期9卷 998-1010页

作者： Abdelhamid M. fouad Magdy M. Saber Yahia M. Ismail Yasser A. Sallam tarek M. Shouman Reham A. A. Elshimy ahmed Abo Gabal Department of Medical Oncology National Cancer Institute Cairo University Cairo Egypt Department of Radiation Oncology National Cancer Institute Cairo University Cairo Egypt Department of Clinical and Chemical Pathology National Cancer Institute Cairo University Cairo Egypt

Introduction: Docetaxel, Cisplatin and 5-Fluorouracil (DPF) became the standard induction chemotherapy in advanced Head and Neck Cancer (HNC) but associated with high toxicity rate. Several studies reported higher response rates with better tolerability when chemotherapy dose is calculated based on Pharmacokinetics (PK) versus conventional Body Surface Area (BSA). Patients and Methods: Thirty nine patients with stage III and IV HNC who received induction DPF were included in the study. Dose of cycle 1 was BSA-based then Docetaxel and 5-FU doses were PK-adjusted starting from cycle 2 whereas Cisplatin dose was BSA-based throughout the study. Results: After median follow up period of 14 months the median overall survival (OS) and progression free survival (PFS) were 15.1 and 10.6 months respectively. Twenty nine patients were available for response assessment. Seven patients (24.1%) achieved complete response while partial response encountered in 19 patients (65.5%) with and Overall response rate of 89.6%. Both treatment related side effects and mortality significantly decreased after the application of PK dose adjustments (p-value 0.007 and 0.01 respectively). Conclusion: PK-guided dose adjustments of 5-FU and Docetaxel in DPF regimen can significantly decrease the treatment related side effects and mortality without compromising the tumor response rate. A randomized clinical trial is needed to compare the PK-guided dose adjustment with the standard BSA based protocol.

关键词： Head and Neck Cancer DPF Docetaxel Fluorouracil Pharmacokinetics Dose Adjustment

Role of endoscopic ultrasound and cyst fluid tumor markers in diagnosis of pancreatic cystic lesions

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World Journal of Gastrointestinal Endoscopy 2022年第6期14卷 402-415页

作者： Hussein Hassan Okasha Abeer Abdellatef Shaimaa Elkholy Mohamad-Sherif Mogawer Ayman Yosry Magdy Elserafy Eman Medhat Hanaa Khalaf Magdy fouad Tamer Elbaz ahmed Ramadan Mervat E Behiry Kerolis Y William Ghada Habib Mona Kaddah Haitham Abdel-Hamid Amr Abou-Elmagd ahmed Galal Wael A Abbas ahmed Youssef Altonbary Mahmoud El-Ansary Aml E Abdou Hani Haggag tarek Ali Abdellah Mohamed A Elfeki Heba ahmed Faheem Hani M Khattab Mervat El-Ansary Safia Beshir Mohamed El-Nady Department of Internal Medicine and Hepatogastroenterology Kasr Al-Aini HospitalsCairo UniversityKasr Al-Aini HospitalsCairo UniversityCairo 11451Egypt Department of Endemic Diseases Cairo UniversityCairo 11451Egypt Department of Tropical Medicine and Gastroenterology Minia UniversityMinia 61511Egypt Department of Internal Medicine Kasr Al-Aini HospitalsCairo UniversityCairo 11562Egypt Department of Gastroenterology Armed forces College of MedicineCairo 11451Egypt Endoscopy and Internal Medicine Consultant at Dr/ahmed Galal Endoscopy Center Alexandria 35516Egypt Department of Internal Medicine Faculty of MedicineAssuit UniversityAssuit 71111Egypt Department of Gastroenterology and Hepatology Mansoura UniversityMansoura 35511Egypt Department of Gastroenterology and Hepatology Theodor Bilharz Research InstituteCairo 11451Egypt Department of Microbiology and Immunology Faculty of Medicine for girls Al-Azhar UniversityCairo 11451Egypt Department of Internal Medicine Faculty of MedicineAin shams UniversityCairo 11451Egypt Department of Internal Medicine Bani-suef UniversityBani-suefBani-suef 62511Egypt Department of Pathology Faculty of MedicineCairo UniversityCairo 11451Egypt Department of Clinical Pathology Faculty of MedicineCairo UniversityCairo 11451Egypt Department of Environmental Medicine&Clinical Pathology National Research CentreCairo 11451Egypt

BACKGROUND Pancreatic cystic lesions(PCLs) are common in clinical practice. The accurate classification and diagnosis of these lesions are crucial to avoid unnecessary treatment of benign lesions and missed opportunities for early treatment of potentially malignant *** To evaluate the role of cyst fluid analysis of different tumor markers such as cancer antigens [e.g., cancer antigen(CA)19-9, CA72-4], carcinoembryonic antigen(CEA), serine protease inhibitor Kazal-type 1(SPINK1), interleukin 1 beta(IL1-β), vascular endothelial growth factor A(VEGF-A), and prostaglandin E2(PGE2)], amylase, and mucin stain in diagnosing pancreatic cysts and differentiating malignant from benign *** This study included 76 patients diagnosed with PCLs using different imaging modalities. All patients underwent endoscopic ultrasound(EUS) and EUS-fine needle aspiration(EUS-FNA) for characterization and sampling of different *** The mean age of studied patients was 47.4 ± 11.4 years, with a slight female predominance(59.2%). Mucin stain showed high statistical significance in predicting malignancy with a sensitivity of 87.1% and specificity of 95.56%. It also showed a positive predictive value and negative predictive value of 93.1% and 91.49%, respectively(P < 0.001). We found that positive mucin stain, cyst fluid glucose, SPINK1, amylase, and CEA levels had high statistical significance(P < 0.0001). In contrast, IL-1β, CA 72-4, VEGF-A, VEGFR2, and PGE2 did not show any statistical significance. Univariate regression analysis for prediction of malignancy in PCLs showed a statistically significant positive correlation with mural nodules, lymph nodes, cyst diameter, mucin stain, and cyst fluid CEA. Meanwhile, logistic multivariable regression analysis proved that mural nodules, mucin stain, and SPINK1 were independent predictors of malignancy in cystic pancreatic *** EUS examination of cyst morphology with cytopathological analysis and cyst fluid ana

关键词： Pancreatic cystic neoplasm Mucinous cystic neoplasm Intraductal papillary mucinous neoplasm Mucin stain Amylase