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Investigation on the Excitation Capacitor for a Wind Pumping Plant Using Induction Generator

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Smart Grid and Renewable Energy 2011年第2期2卷 116-125页

作者： Manel Ouali Mohamed Ben Ali Kamoun maher Chaabene University of Sfax Unite de Commande de Machines et Reseaux de Puissance CMERP-ENIS

This paper presents a SEIG-IM system using a self excited induction generator driven by wind turbine and supplying an induction motor which is coupled to a centrifugal pump. A method to describe the steady state performance based on nodal analysis is presented. Furthermore, a dynamic analysis and performance characteristics are examined. The pro-posed methodology is discussed in order to optimize the quantity of the pumped water. Therefore an optimal excitation capacitor for a given wind rotor speed is determined and a suitable operation mode of the system is established.

关键词： SEIG IM Centrifugal Pump Optimal Excitation Capacitor Wind Rotor Speed

Using Cellular Automata-Markov Analysis and Multi Criteria Evaluation for Predicting the Shape of the Dead Sea

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Advances in Remote Sensing 2015年第1期4卷 83-95页

In order to make a rational prediction of the Dead Sea shape, data were prepared for suitability map creation using Markov Chain analysis and Multi Criteria Evaluation (MCE). Then, Markov Cellular Automata model and spatial statistics were used in prediction and validation processes. The validation process shows a standard Kappa index of 0.9545 which means a strong relation between the model and reality. The predicted shapes of years 2020, 2030 and 2040 follow the same conditions from 1984 to 2010. The predicted areas of 2020, 2030 and 2040 are 610, 591 and 574 km2 which are considered a logical extension of the trend from 1984 till 2010. This study can be used as an environmental alert in order to keep the Dead Sea alive. Moreover, Markov-Cellular Automata model can be used to predict closed seas as the Dead Sea from remote sensed data.

关键词： Dead Sea Markov Chain Analysis Cellular Atutomata Multi Criteria Evaluation

High Sensitive Graphene Devices for Non-Invasive Early Diagnosis of Hyperthyroidism: A Feasibility Study

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Journal of Biomedical Science and Engineering 2019年第12期12卷 522-532页

作者： Avinash Yadav Inayeth Ali Ahdy Helmy maher Rizkalla Department of Electrical and Computer Engineering Purdue School of Engineering and Technology Indiana University-Purdue University Indianapolis (IUPUI) Indianapolis IN USA Department of Mechanical and Energy Engineering Purdue School of Engineering and Technology Indiana University-Purdue University Indianapolis (IUPUI) Indianapolis IN USA Richard L. Roudebush Veterans Administration Medical Center Indianapolis IN USA Integrated Nanotechnology Development Institute (INDI) Indiana University-Purdue University Indianapolis (IUPUI) Indianapolis IN USA

This paper presents a novel approach with Graphene devices that are highly sensitive in detecting IR energy. Current non-imaging techniques like ultrasonography have been proposed for thyroid diagnosis with limitations on ability to detect low-temperature distribution around the hot spot at the starting stage of the thyroid hyperthyroidism. The energy distribution around hotspot is minimal at the beginning stage. This detection may require ultra-high sensitive materials to the IR energy. A computer modeling using COMSOL software shows the thermal energy simulation of a thyroid gland with single or multiple active nodules. Data collection of the energy levels and condition of thyroid in the human body support the work investigated in this study. The study conducted here has shown as low as 0.1 - 5 mW IR power can be detected based on the Graphene device sensitivity. The paper details the simulation and approach for this non-invasive diagnosis.

关键词： Diagnosis Non-Invasive GNRFET Thermography Ultrasonography IoT

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中国黄土堆积的磁性记录与古降雨量重建

地球科学进展 2002年第3期17卷 320-325页

作者：胡蒙育 B.maher CentreforEnvironmentalMagnetismandPalaeomagnetism

概述了中国黄土和古土壤堆积的磁性特征 ,进而介绍成壤作用磁铁矿成因模式。

关键词：黄土古土壤磁性特征土壤成因磁化率古降雨量

Electromagnetic Simulation for the Diagnosis of Lipoprotein Density in Human Blood, a Non-Invasive Approach

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Open Journal of Applied Biosensor 2017年第1期4卷 1-11页

作者： Ethan Law Monika Kakani Mangilal Agarwal maher Rizkalla Department of Biochemistry DePauw University Greencastle IN USA Department of Electrical and Computer Engineering IUPUI Indianapolis IN USA Integrated Nanosystem Development Institute Indianapolis IN USA Department of Mechanical Engineering IUPUI Indianapolis IN USA

With the rise in prevalence of Type II diabetes throughout the world, an increasing need for a portable monitoring system for both blood glucose and lipoprotein concentrations is in demand. Recent work has led to non-invasive wearable devices for monitoring changes in blood glucose concentrations using electromagnetic (EM) waves. However, this still fall short as a means of monitoring cholesterol levels in diabetic patients. The EM study on human tissues emphasized here may also relate to the safety guidelines applied to cellular communications, power lines, and other EM applications. The specific absorption rate (SAR) for the power of the non-ionizing frequency must not exceed a threshold as it impacts DNA and can lead to cancerous tissues. In this study, we used COMSOL software for the investigation of the viability of using EM within the frequency range of 64 MHz-1 GHz as a means of monitoring the transmission properties of human blood and lipoprotein. In this approach, wave equations were solved within blood and lipoprotein boundaries. Research parameters, including frequency range, Power input (SAR), and lipoprotein densities, were investigated. The transmission properties, produced by the electrical and thermal characteristics of these physiological parameters, have led to proper diagnosis of lipoprotein density. Within the frequency range of 64 MHz to 1 GHz, and for a power range of 0.1 to 0.6 SAR, lipoprotein density from 1.00 g/mL to 1.20 g/mL was considered. A 2D model, with an antenna source that supplied the electromagnetic waves to human tissues, was created for the simulations. These were used for the study of the transmission properties of the EM energy into the blood and lipoprotein tissues. While the range of magnetic flux values between simulations varies only slightly or not at all, the distribution of these values is impacted by given parameters. As such, a device capable of comparing magnetic flux values and penetration depths could easily disti

关键词： Non-Invasive Monitoring Cholesterol Electromagnetic Biosensors Wearable Devices

Swinging up a Real-Time Inverted Pendulum System

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Journal of Mechanics Engineering and Automation 2011年第5期1卷 407-411页

作者： maher Mohammed AlOmari Saeb Farhan Al Ganideh Department of Computer Engineering Hijjawi Faculty for Engineering Technology Yarmouk Universigy Irbid 21163 Jordan Department of Marketing Faculty of Economics AI Zaytoonah Private University of Jordan Amman 11733 Jordan

In this study, a real-time control of the cart inverted pendulum system was developed using Mamdani type Fuzzy Logic Controller. Swing-up and stabilization of the inverted pendulum were implemented directly in a Fuzzy Logic Controller. The fuzzy logic controller was designed in the Matlab-Simulink environment and applied into in a Quasar controller board. Swing-up algorithm brings the pendulum near to its inverted position in 5 seconds from downward position. External forces were applied on the inverted pendulum to test the robustness of the fuzzy logic controller under internal as well as external disturbances. The inverted pendulum system showed an acceptable robustness to the external and internal disturbances.

关键词： Fuzzy control inverted pendulum.

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Cadmium nanoclusters in a protein matrix： Synthesis, characterization, and application in targeted drug delivery and cellular imaging

作者： (新西兰)埃德温·马厄(Edwin maher)

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Nano Research 2016年第11期9卷 3229-3246页

作者： Morteza Sarparast Abolhassan Noori Hoda Ilkhani S. Zahra Bathaie maher F. EI-Kady Lisa J. Wang Huong Pham Kristofer L. Marsh Richard B. Kaner Mir F. Mousavi Department of Chemistry Tarbiat Modares University Tehran 14115-175 Iran Department of Clinical Biochemistry Faculty of Medical Sciences Tarbiat Modares University Tehran 14115-111 Iran Department of Chemistry and Biochemistry University of California Los Angeles Los Angeles CA 90095 USA Department of Chemistry Faculty of Science Cairo University Giza 12613 Egypt California NanoSystems Institute University of California Los Angeles Los Angeles CA 90095 USA

Biotemplated metal nanoclusters have garnered much attention owing to their wide range of potential applications in biosensing, bioimaging, catalysis, and nanomedicine. Here, we report the synthesis of stable, biocompatible, watersoluble, and highly fluorescent bovine serum albumin-templated cadmium nanoclusters （CdNcs） through a facile one-pot green method. We covalently conjugated hyaluronic acid （HA） to the CdNcs to form a pH-responsive, tumor- targeting theranostic nanocarrier with a sustained release profile for doxorubicin （DOX）, a model anticancer drug. The nanocarrier showed a DOX encapsulation efficiency of about 75.6%. DOX release profiles revealed that 74% of DOX was released at pH 5.3, while less than 26% of DOX was released at pH 7.4 within the same 24-h period. The nanocarrier selectively recognized MCF-7 breast cancer cells expressing CD44, a cell surface receptor for HA, whereas no such recognition was observed with HA receptor-negative HEK293 cells. Biocompatibility of the nanocarrier was evaluated through cytotoxicity assays with HEK293 and MCF-7 ceils. The nanocarrier exhibited very low to no cytotoxicity, whereas the DOX-loaded nanocarrier showed considerable cellular uptake and enhanced MCF-7 breast cancer cell-killing ability. We also confirmed the feasibility of using the highly fluorescent nanoconjugate for bioimaging of MCF-7 and HeLa cells. The superior targeted drug delivery efficacy, cellular imaging capability, and low cytotoxicity position this nanoconjugate as an exciting new nanoplatform with promising biomedical applications.

关键词： Cd nanoclusters hyaluronic acid targeted drug delivery fluorescence bioimaging nanocarrier

Survival and outcomes for co-infection of chronic hepatitis C with and without cirrhosis and COVID-19: A multicenter retrospective study

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World Journal of Gastroenterology 2021年第42期27卷 7362-7375页

作者： Shimaa Afify Basem Eysa Fatma Abdel Hamid Omnia M Abo-Elazm Mohamed A Edris Rabab maher Ahmed Abdelhalim Muhammad Mostafa Abdel Ghaffar Dalia A Omran Hend Ibrahim Shousha Department of Gastroenterology National Hepatology and Tropical Medicine Research InstituteCairo 20222Egypt Department of Endemic Medicine Faculty of MedicineFayoum UniversityEl-Fayoum 13524Egypt Department of Biostatistics and Cancer Epidemiology National Cancer InstituteCairo 20222Egypt Department of Gastroenterology Students HospitalCairo UniversityGiza 12111Egypt The General Organization for Teaching Hospitals and Institutes Cairo 11562Egypt Department of Endemic Medicine Faculty of MedicineCairo UniversityCairo 11562Egypt

BACKGROUND Chronic liver disease,particularly cirrhosis,is associated with worse outcomes in patients infected with coronavirus disease 2019(COVID-19).AIM To assess outcomes of COVID-19 infection among patients with pre-existing hepatitis C with or without liver *** This multicenter,retrospective cohort study included all cases of confirmed coinfection of severe acute respiratory syndrome coronavirus 2 and chronic hepatitis C with or without liver cirrhosis who were admitted to six hospitals(Al-Sahel Hospital,Al-Matareya Hospital,Al-Ahrar Hospital,Ahmed maher Teaching Hospital,Al-Gomhoreya Hospital,and the National Hepatology and Tropical Medicine Research Institute)affiliated with the General Organization for Teaching Hospitals and Institutes in *** were recruited from May 1,2020,to July 31,***,laboratory,imaging features,and outcomes were *** regression analysis was performed to detect factors affecting *** This retrospective cohort study included 125 patients with chronic hepatitis C and COVID-19 co-infection,of which 64(51.20%)had liver cirrhosis and 40(32.00%)***,cough,dyspnea,and fatigue were the most frequent symptoms in patients with liver ***,sore throat,fatigue,myalgia,and diarrhea were significantly more common in patients with liver cirrhosis than in noncirrhotic *** was no difference between patients with and without cirrhosis regarding *** patients(23.40%)with liver cirrhosis presented with hepatic *** with liver cirrhosis were more likely than non-cirrhotic patients to have combined ground-glass opacities and consolidations in CT chest scans:28(43.75%)vs 4(6.55%),respectively(P value<0.001).These patients also were more likely to have severe COVID-19 infection,compared to patients without liver cirrhosis:29(45.31%)vs 11(18.04%),respectively(P value<0.003).Mortality was higher in patients with liver cirrhosis,compar

关键词： COVID-19 Egypt Outcome Liver cirrhosis Chronic hepatitis C