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Vibration Performance, Stability and Energy Transfer of Wind Turbine Tower via Pd Controller

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Computers, Materials & Continua 2020年第8期64卷 871-886页

作者： Y.S.hamed Ayman A.Aly B.Saleh Ageel F.Alogla awad M.Aljuaid Mosleh M.Alharthi Department of Mathematics and Statistics Faculty of ScienceTaif UniversityTaifPO Box 888Saudi Arabia Department of Physics and Engineering Mathematics Faculty of Electronic EngineeringMenoufia UniversityMenoufPO Box 32952Egypt Department of Mechanical Engineering College of EngineeringTaif UniversityTaifPO Box 888Saudi Arabia Department of Mechanical Engineering Faculty of EngineeringAssiut UniversityAssiutPO Box 71516Egypt Department of Electrical Engineering College of EngineeringTaif UniversityTaifPO Box 888Saudi Arabia

In this paper,we studied the vibration performance,energy transfer and stability of the offshore wind turbine tower system under mixed *** method of multiple scales is utilized to calculate the approximate solutions of wind turbine *** proportional-derivative controller was applied for reducing the oscillations of the controlled *** the controller to single degree of freedom system equation is responsible for energy transfers in offshore wind turbine tower *** steady state solution of stability at worst resonance cases is studied and *** offshore wind turbine system behavior was studied numerically at its different parameters ***,the response and numerical results were obtained and *** stability is also analyzed using technique of phase plane and equations of frequency *** addition,the numerical results and comparison between analytical and numerical solutions were obtained with MAPLE and MATLAB algorithms.

关键词： Vibration control stability offshore wind turbine system energy transfer

A Case of Multiple Myeloma and Renal Failure in a Young Patient

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Open Journal of Nephrology 2016年第4期6卷 138-144页

作者： Muftah Othman Eiman Homid Mohamed Sadek Ali Rahil awad rashed Nephology Unit Hamad Medical Corporation Doha Qatar Medicine Department Hamad Medical Corporation Doha Qatar

Multiple myeloma is a malignant plasma cell disorder that affects the kidney with various clinical presentations. The most common renal manifestation of multiple myeloma is myeloma cast nephropathy. We are describing a young patient with multiple myeloma presented with back pain, anemia and renal impairment. The renal biopsy showed a myeloma cast nephropathy. She was treated with myeloma chemotherapy, high cut-off hemodialysis and autologous hematopoietic stem cell transplantation with good outcome. We report this rare case of multiple myeloma presented with myeloma cast nephropathy (MCN) in a young patient to describe the evidence of light chain removal strategies including plasmapheresis and high cut-off hemodialysis for the management of myeloma cast nephropathy.

关键词： Myeloma Cast Nephropathy Plasmapheresis and High Cut-Off Hemodialysis

Transthoracic echocardiographic and clinical predictors in first versus recurrent ischemic strokes

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World Journal of Cardiovascular Diseases 2014年第2期4卷 70-76页

作者： Yasser Bahnacy Amr Abo Koora hamed Dawoud Wafa rashed Ali Sadek Cardiology Division Chest Diseases Hospital Ferwania Kuwait Cardiology Division Department of Medicine Mubarak Al-Kabeer Hospital Hawally Kuwait Neurology Division Department of Medicine Mubarak Al-Kabeer Hospita Hawally Kuwait Public Health Department Ministry of Health Ferwania Kuwait

Recurrent strokes are more likely to be disabling or fatal than first ever strokes. The aim of the study is to evaluate transthoracic echocardiographic (TTE) and clinical predictors in patients with first versus those with recurrent ischemic strokes. A prospective observational comparative study of 217 patients admitted with ischemic strokes who were in sinus rhythm. Two groups of patients were simultaneously enrolled. The first group was 110 patients with first ischemic stroke and the second was 107 patients with recurrent ischemic stroke. TTE was done for all patients. Both echocardiographic and clinical risk factors were compared between both groups. Logistic regression analysis identified predictors for recurrent strokes. Among clinical risk factors hypertension, hyperlipidemia, family history of atherosclerotic vascular disease, prior coronary artery disease, peripheral vascular disease, and chronic kidney disease were significantly higher in recurrent stroke group. Multivariate logistic analysis identified age (OR, 1.03;95% CI, 1.01 - 1.07), hypertension (OR, 2.25;95% CI, 1.03 - 4.92), and hyperlipidemia (OR, 2.73;95% CI, 1.40 - 5.35), as predictors for recurrent ischemic strokes. Left ventricular diastolic dysfunction, left ventricular hypertrophy (LVH) and aortic sclerosis were significantly more common in the recurrent stroke group compared to the first stroke group. However, in multivariate logistic analysis only LVH (OR, 3.50;95% CI, 1.69 - 7.23), was identified as a predictor for recurrent strokes. Older age, hypertension, hyperlipidemia and left ventricular hypertrophy are significant predictors of recurrent ischemic strokes in patients with sinus rhythm. Those patients need more aggressive lipid lowering therapy and optimal blood pressure control.

关键词： Echocardiography Risk Factors Predictors Ischemic Stroke

Application of Plant Growth-Promoting Bacteria as an Eco-Friendly Strategy for Mitigating the Harmful Effects of Abiotic Stress on Plants

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Phyton-International Journal of Experimental Botany 2023年第12期92卷 3305-3321页

作者： Ahmed Hassan Abdou Omar Abdullah Alkhateeb Hossam Eldin hamed Mansour Hesham S.Ghazzawy Muayad Saud Albadrani Nadi awad Al-harbi Wasimah B.Al-Shammari Khaled Abdelaal Social Studies Department College of ArtsKing Faisal UniversityAl-Ahsa31982Saudi Arabia Department of Agribusiness and Consumer Sciences College of Agriculture&Food SciencesKing Faisal UniversityAl-Ahsa31982Saudi Arabia Agribusiness and Consumer Sciences Department College of Agricultural and Food SciencesKing Faisal UniversityAl-Ahsa31982Saudi Arabia Date Palm Research Center of Excellence King Faisal UniversityAl-Ahsa31982Saudi Arabia Department of Family and Community Medicine College of MedicineTaibah UniversityAl-Madinah Al-Munawara42353Saudi Arabia Biology Department University College of TaymaUniversity of TabukTabukSaudi Arabia Department of Biology College of ScienceUniversity of HailP.O.Box 2440Hail55476Saudi Arabia EPCRS Excellence Center Plant Pathology and Biotechnology LaboratoryAgricultural Botany DepartmentFaculty of AgricultureKafrelsheikh University33516Egypt

Plant growth-promoting bacteria(PGPB)play an important role in improving agricultural production under several abiotic stress *** can be used to increase crop growth and development through hormonal balance and increase nutrient *** positive effect of PGPB may be due to its pivotal role in morphophysiological and biochemical characteristics like leaf number,leaf area,and stem ***,relative water content,chlorophyll content,carotenoids,antioxidant enzymes,and plant hormones were improved with PGPB *** yield and yield components were also increased with PGPB treatment in numerous *** anatomical structure of plant organs was increased such as lamina thickness,stem diameter,xylem vessel diameter,and number of xylem vessels as well as phloem thickness under treatment with ***,PGPB can alleviate the negative effects of several abiotic stresses by regulating the antioxidant defense system to scavenge the reactive oxygen species resulting in an improvement of yield production in the stressed ***,gene expressions were controlled by calcium ion modulation during secondary messengers that act upon calcium-dependent protein kinase and protein *** includes many transcription factors such as MYB,AP2/ERF,bZIP,and NAC which regulate genes related to salinity stress *** can demonstrate induction genes of signaling under abiotic stress *** review gives an outline of the PGPB role in alleviating the harmful effects of abiotic factors such as salinity,drought,and heat associated with the improvement of the morpho-physiological and biochemical features especially,leaves and branches number,leaf area,antioxidant compounds,plant hormones,and relative water content.

关键词： PGPB salinity drought heat reactive oxygen species antioxidants gene expressions

Heart Failure Prediction in Athletic Heart Remodeling among Long Distance Runners

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World Journal of Cardiovascular Diseases 2022年第1期12卷 1-10页

作者： Hossam Abdel Aleem Shaheen Manal Ahmed Mohamed Fatma Hasan Abdel Basset Mostafa hamed rashed Neethu Betty Theruvan Soad A. Mosbah Department of Cardiac Technology College of Applied Medical Sciences Imam Abdulrahman Bin Faisal University Dammam City Kingdom of Saudi Arabia Department of Biochemistry National Heart Institute Giza Egypt Department of Physical Sport Sohar University Sohar Oman

Background: Physical activity has a cardinal role in preventing and treating cardiovascular diseases. Understanding the changes that occur to the cardiac muscle in athletes is still doubtful whether it is only an adaptation to exercise or a concealed pathological condition. Most of these changes are well documented in apparently healthy heart and characterized by cardiac enlargement with Brady-arrhythmias specially individuals participating in long distance runners with exercise capacity without signs of cardiovascular disease. Methods: The study searched the subclinical myocardial necrosis by comparing two groups of young marathon runners, both groups were chosen from Al Gizera youth center in January 2018. First group included adults above the age of 18 years and ran for 12 km. and the second was under 18 years and ran for about 8 km. Both groups were volunteered for this study. They are monitored carefully with blood pressure, heart rate and respiratory rate and their blood samples were collected pre- and post-race immediately for assessment of cardiac markers NTproBNP, Galectin-3 and cTnI. Results: All cardiac markers were elevated post exercise compared to that achieved in pre-exercise regardless age of athletes. Also, pre-exercise adult results were higher in galectin-3 and cTnI but not in proBNP while there is no difference in the acute response in both groups. These results revealed micro cardiac necrosis due to long run exercise with possible bad prognosis. Conclusions: It is important to develop risk assessment and prediction methods for screening the young athletes and consider the term athletic heart as a subclinical disorder rather than physiological adaptation.

关键词： Athletes Exercise Phidippides Cardiomyopathy Remodeling

Image-Guided Radiotherapy Dose Escalation in Intermediate and High Risk Cancer Prostate Patients and Its Effect on Treatment Toxicity

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Journal of Cancer Therapy 2017年第6期8卷 591-602页

作者： Mohsen S. Barsoum Azza Mohamed Nasr Ikram hamed Mahmoud Salem E. Salem Rasha A. Elawady Shaimaa Abdelallem Ahmed awad Department of Radiation Oncology NCI-Cairo University Cairo Egypt Department of Radio Diagnosis NCI-Cairo University Cairo Egypt Department of Medical Oncology NCI-Cairo University Cairo Egypt Department of Medical Statistics NCI-Cairo University Cairo Egypt

Purpose: To study the effect of escalating radiation dose;in intermediate and high risk prostate cancer patients;via online image-guidance on acute toxicities. Patients and Methods: thirty-eight prostate cancer patients were treated by using simultaneous integrated boost-intensity modulated radiation therapy (SIB-IMRT) with online image guided correction via kilo voltage cone beam computed tomography (KV-CBCT)/electronic portal imaging device (EPID) of trans-rectal ultrasound (TRUS)-inserted intraprostatic gold fiduciary markers. High-risk patients received a median dose of 80.5 Gy to prostate and 56 Gy to pelvic nodes in 35 fractions over 7 weeks. Intermediate-risk patients received a similar prostate dose over the same overall treatment time. Acute toxicity (bladder, rectal and bowel symptoms) was reported once weekly during the radiation course and up to 3 months from the end of the radiation course. Results: The image guided (IG)-IMRT allows escalating the radiation dose delivered to the prostate through minimizing the margin of setup error to less than 0.5 cm with subsequent sparing of nearby organs at risk. Out of thirty-eight patients, no patient developed >grade 1 acute rectal toxicity, 7.9% of patients experienced grade 3 urinary toxicity and there was no reported small intestinal toxicity. Conclusion: Escalating the radiation dose more than 80 Gy in intermediate and high risk prostate cancer patients was safe and not associated with grade 3 - 4 RTOG toxicity when guided by online verification of intra-prostatic fiducial markers.

关键词： Prostate Cancer High-Risk Intermediate-Risk Fiducial Markers Image Guided Radiotherapy Dose Escalation Acute Toxicity SIB-IMRT