检索结果-南通市图书馆

Frontiers in Energy 2015年第4期9卷 413-425页

作者： Abrar ALLAG Abdelhamid BENAKCHA Meriem ALLAG Ismail ZEIN mohamed yacine ayad LGEB Laboratory Department of Electrical Engineering University of Biskra Biskra BP 145 Algeria R&D Industrial Hybrid Vehicle Applications Belfort 90010 France

The problem of state feedback controllers for a class of Takagi-Sugeno （T-S） Lipschitz nonlinear systems is investigated. A simple systematic and useful synthesis method is proposed based on the use of the differential mean value theorem （DMVT） and convex theory. The proposed design approach is based on the mean value theorem （MVT） to express the nonlinear error dynamics as a convex combination of known matrices with time varying coefficients as linear parameter varying （LPV） systems. Using the Lyapunov theory, stability conditions are obtained and expressed in terms of linear matrix inequalities （LMIs）. The controller gains are then obtained by solving linear matrix inequalities. The effectiveness of the proposed approach for closed loop-field oriented control （CL-FOC） of permanent magnet synchronous machine （PMSM） drives is demonstrated through an illustrative simulation for the proof of these approaches. Furthermore, an extension for controller design with parameter uncertainties and perturbation performance is discussed.

关键词： Takagi-Sugeno (T-S) fuzzy systems sectornonlinearity nonlinear controller linear matrix inequality(LMI) approach differential mean value theorem (DMVT),field oriented control (FOC) linear parameter varying(LPV)

Observer design for induction motor： an approach based on the mean value theorem

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2014年第4期8卷 426-433页

作者： mohamed yacine HAMMOUDI Abdelkarim ALLAG mohamed BECHERIF mohamed BENBOUZID Hamza ALLOUI MSE Laboratory Department of Electrical Engineering University ofBiskra BP 145 Biskra 07000 Algeria FCLab University of Technology of Belfort-Montbdliard CNRS 3539 Femto-ST UMR 6174 Belfort 90010 France LBMS University of Brest Kergoat street CS 93837 29238 BrestCedex 3 France Ecole militaire polytechnique UER ELT Algiers 1611 Algeria

In this paper, observer design for an induction motor has been investigated. The peculiarity of this paper is the synthesis of a mono-Luenberger observer for highly coupled system. To transform the nonlinear error dynamics for the induction motor into the linear parametric varying （LPV） system, the differential mean value theorem combined with the sector nonlinearity transformation has been used. Stability conditions based on the Lyapunov function lead to solvability of a set of linear matrix inequalities. The proposed observer guarantees the global exponential convergence to zero of the estimation error. Finally, the simulation results are given to show the performance of the observer design.

关键词： observer design differential mean value theorem (DMVT) sector nonlinearity transformation linear matrix inequalities (LMI) induction motor

In-vitro effect of Peganum harmala total alkaloids on spermatozoa quality and oxidative stress of epididymal ram semen

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Asian pacific Journal of Reproduction 2021年第5期10卷 232-238页

作者： Hanane Derbak mohamed Moussaoui Amine Benberkane Abdelhanine ayad Department of Biological Sciences of the Environment Faculty of Nature and Life SciencesUniversitéde Bejaia06000 BejaiaAlgeria

Objective:To determine the in-vitro effect of the total alkaloid extract of Peganum(P.)harmala seeds on ram epididymal ***:Semen was divided into six groups according to the following concentrations of the *** total alkaloids:1,5,10,50,and 100μg/mL,and the control *** samples were incubated at ambient temperature(21℃-24℃)for 24 h,and analyzed in terms of motility,membrane integrity,and oxidative ***:The sperm kinematic parameters,***-line velocity,curvilinear velocity,average path velocity,were significantly higher when treated with *** at concentrations ranging from 1 to 10μg/mL compared to the control group(P0.05).Conclusions:Low concentrations(1-10μg/mL)of *** extracts stimulate sperm motility,preserve membrane integrity and protect ram spermatozoa from lipid peroxidation.

关键词： Alkaloids Epididymal sperm Motility Peganum harmala Ram Semen Membrane integrity Lipid peroxidation 1.Introduction

Boron-10 lined proportional counter development for thermal neutron detection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2021年第1期5卷 110-116页

作者： mohamed Fares mohamed yacine Debili Mohammed Messaoudi Samir Begaa Kassida Negara Adnane Messai Laboratory of Nuclear Detectors Department Detection and MeasurementNuclear Research Centre of BirineP.O.Box 18017200 Ain OusseraDjelfaAlgeria LM2S Physics DepartmentFaculty of ScienceBadji Mokhtar UniversityBP 1223200 AnnabaAlgeria Reactor Chemistry Department Nuclear Research Centre of BirineP.O.Box 18017200 Ain OusseraDjelfaAlgeria

Purpose Neutrons detection is of paramount importance in nuclear physics experiments,reactor physics,monitoring and control of nuclear reactors and in radiation *** the neutron detectors used are Proportional Counters(PC to BF3,boron deposition,3He),Our Detection and Measurements laboratory has embarked on a project to develop,design and build proportional counters with boron deposition mainly for gas filling,several prototypes of which have been *** This work presents the Boron-10 Lined Proportional Counters(PC),developed and produced in the Detection and Measurements Department(DDM19).The PC was designed by adopting,for the electrodes,a stainless steel cathode 0.5 mm thick and a gold-plated tungsten anode with diameter of 25μ*** detectors are filled with an Ar-CH4 mixture(10%)at a pressure of 20 *** boron deposition is performed by the technique of *** The results obtained using the DDM19 prototype PC(Detector produced in our Detection and Measurement laboratory,2019),show the advantage of electrophoresis as a better boron deposition technique,and the limitation of the surface mass of 10B to optimal values is around 0.5 at 0.6 mg/*** The characteristics of the gas amplification in the mixture(Ar-CH4(CH410%)),were measured by different methods and compared with the values of the proportional reference counter *** counting plates for the two reference meters LND232 and our DDM19 prototype from 200 to 300 V have slopes ranging from 6.5 to 10%/100 V,and gas amplification factors from 1436 to 1380,respectively.

关键词： Neutron detector Boron-10 lined proportional counter Reference LND232 Boron deposition technique

^(3)He proportional counter development for thermal neutron detection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2021年第2期5卷 264-272页

作者： mohamed Fares Adnane Messai Samir Begaa Maameri Salem Kassida Negara mohamed yacine Debili Mohammed Messaoudi Laboratory of Nuclear Detectors Department Detection and MeasurementNuclear Research Centre of BirineP.O.Box 18017200 Ain OusseraDjelfaAlgeria Reactor Chemistry Department Nuclear Research Centre of BirineP.O.Box 18017200 Ain OusseraDjelfaAlgeria LM2S Physics DepartmentFaculty of ScienceUniversity of Badji Mokhtar-AnnabaP.O.Box.BP 1223000 AnnabaAlgeria

Neutron detection is used in a wide range of applications in nuclear physics,radiation protection,nuclear fuel cycle,reactor instrumentation,security and industrial *** the detectors used in this field,we notice the gas-filled 3He proportional counters which have been one of the main detecting tools for thermal and cold neutron detection for many *** last characteristic has ensured that this detector is one of the best tools for thermal neutron flux measurements in a nuclear reactor *** the instrumentation and detection laboratory of the Nuclear Research Center,of Birine,we are working toward the design and the development of this type of detectors,indeed,several prototypes of neutron detectors have been realized including the 3He proportional *** this paper,we will present the experimental steps and the obtained results to carry out a 3He proportional counter prototype that was fully developed and tested in our laboratory.A comparison study was made between our detector and a commercial cylindrical 3He neutron detector which was considered in this work as a reference detector:LND252(3He)-*** results showed that the characteristics of the gas amplification and the counting plateau for the two counters reference LND 252(3He)-PC and our prototype was of the same order of *** experimental tests show that our developed prototype perfect fit with the standard International Electrotechnical Commission(IEC,***)in the operating principle,the technology adopted and obtained technical specifications.

关键词： Neutrons detectors 3He proportional counters Counting plateau Discrimination Gas amplification

Development of self-powered neutron detectors used in nuclear medicine for the measurement of neutron flows during treatment of boron neutron therapy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2021年第3期5卷 459-465页

作者： mohamed Fares Adnane Messai Salem Mameri Mohammed Messaoudi mohamed yacine Debili Hebboul Nourddine Kassida Negara Begaa Samir Laboratory of Nuclear Detectors Department Detection and MeasurementNuclear Research Centre of BirineAin OusseraP.O.Box 18017200 DjelfaAlgeria Reactor Chemistry Department Nuclear Research Centre of BirineAin OusseraP.O.Box 18017200 DjelfaAlgeria LM2S Physics DepartmentFaculty of ScienceUniversity of Badji Mokhtar-AnnabaP.O.Box.BP 1223000 AnnabaAlgeria

Purpose The Self Powered Neutrons Detectors(SPND)have the advantage of not requiring a high voltage power supply for their operation and are small in size,enhancing the interest of these detectors in *** In this context,we have developed a thermal neutron detection system based on *** detector was placed in the thermal channel of our nuclear research reactor;where the values of the current for each detector have been recorded as a function of time,with a chain in a current mode where electrometers without HV were *** We performed the real-time measurement of neutron flux during boron neutron capture therapy or boron neutron therapy,the different materials constituting the SPND detectors have been carefully chosen for this *** detectors were tested at a power of four MW corresponding to a neutron flux of 10^(9) n cm^(−2) s^(−1).Conclusions The usefulness of 103Rh-SPND is for online measurement of thermal neutron flux on BNCT patients has been demonstrated based on an appropriate calibration of the thermal neutron spectrum.

关键词： SPND Thermal neutron Capture therapy Flux Detection Boron

Introduction to Mesh Based Generated Lumped Parameter Models for Electromagnetic Problems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CES Transactions on Electrical Machines and Systems 2021年第2期5卷 152-162页

作者： Shuo Yang Salim Asfirane Sami Hlioui Smail Mezani Guillaume Krebs yacine Amara Georges Barakat mohamed Gabsi Wei Hua Southeast University NanjingChina UniversitéLe Havre Normandie Conservatoire national des arts et métiers Universitéde Lorraine UniversitéParis-Saclay Facultédes Sciences d'Orsay ENS Paris-Saclay

This paper is an introduction to mesh based generated reluctance network *** overview of scientific works which led to the development of this approach is first *** concepts of the approach are then presented in the case of electromagnetic devices.A step-by-step procedure for coding the approach in the case of a flat linear permanent magnet machine is *** developed under MATLAB and Scilab environments are also included.

关键词： Lumped parameter modeling finite element method mesh electromagnetic devices modeling

A Study on Infertility of Males Infected with <i>Mycoplasma hominis</i>with Reference to Sperm Morphology

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Open Journal of Pathology 2021年第1期11卷 7-21页

作者： Mohemid Maddallah Al-Jebouri ayad Abdullah mohamed Department of Microbiology College of Medicine University of Tikrit Tikrit Iraq Department of Medical Laboratory Techniques Al-Hadba’a University College Mosul Iraq

Objectives: The main objective of this study was to investigate the effect of Mycoplasma hominis infection on the morphology of sperms and its association with the infertility of men. The patients were referred to the Urology Departments of Mosul General Hospital and Soran Hospital in Mosul and Erbil respectively. Methods: The present study was carried out from April 2019 to March 2020 and the number of the patients group was 108. The patients aged 20 to 60 years. Semen was collected from infertile men of a couple that female failed to become pregnant after one year of regular and unprotected intercourse of marriage and submitted for seminal fluid analysis as well as for bacteriological investigations Results: M. hominis was detected in 14 semen specimens (12.9%) from the infertile men. The teratozoospermia, normozoospermia, asthenoteratozoospermia, oligoasthenoteratozoospermia, asthenozoospermia, oligozoospermia, oligoasthenozoospermia and leukospermia were seen among patients examined. Statistically, there were no significant differences between these forms of infected infertile men and non-infected infertile men (P > 0.05). Conclusions: The results of present study demonstrated that the genital Mycoplasma hominis seems to be widespread among male partners of infertile couples in Iraq. The present data did not show any significant differences between forms of the sperm concentration and sperm morphology related to the infection by M. hominis.

关键词： Male Infertility Sperms Mycoplasma hominis Infection Iraq

Study of Bradyarrhythmias in Acute Myocardial Infarction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Cardiovascular Diseases 2022年第1期12卷 38-49页

作者： Samir Rafla Sherif Wagdy ayad mohamed Sanhoury Department of Cardiology Faculty of Medicine Alexandria University Alexandria Egypt

Background: Arrhythmias after acute myocardial infarction are common. Bradyarrhythmias need specific insight into when and how to treat them. Objectives: To delineate the incidence, course, and management of different types of bradyarrhythmias after acute myocardial infarction, the study period was five years. Methods: 453 patients with Acute Myocardial Infarction (AMI) were admitted to intensive care in five years. ECGs were analyzed for the presence of bradyarrhythmias and details of management. Results: 65 patients with bradycardia were found. Sinus bradycardia in 40, sick sinus syndrome in 10, junctional rhythm

关键词： Acute Myocardial Infarction Complete Heart Block Temporary Pacemakers Bradyarrhythmias Atropine

Characterization of Upper Air Way Tract in Snoring and Non-Snoring Patients: A CT Based Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Radiology 2016年第3期6卷 181-190页

作者： Fathia Abd El Rahman mohamed Alamin Caroline Edward ayad College of Medical Applied Science Jazan University Jazan KSA College of Medical Radiological Science Sudan University of Science and Technology Khartoum Sudan

Snoring is part of the spectrum of sleep disordered breathing. The patients with snoring should be evaluated for nasal airway obstruction. In this study, the upper air way tract was characterized in snoring patients and compared with none snoring using a quantify method for the corresponding anatomic upper air way (UA) parameters examined by Computerized Tomography (CT). Two hundred Asian patients undergoing CT scanning for head and neck were included and were divided into two groups (snoring group [n = 127] and non-snoring group [n = 73]) (mean age: 44.8 ± 15.9 years and 26.2 ± 7.0). Total 8 parameters were measured on sagital reconstructed CT images for each subject. The differences in neck circumference (NC), linear distance between mandibular plane and hyoid bone (Mp-H), upper airway length (UAL), the maximum thickness of the soft palate (SP max), soft palate length (PNS-U), linear distance between anterior and posterior nasal spine (ANS-PNS), retroglosal width (RS), retroplatal width (RP) between the snoring and non-snoring groups were compared statistically using independent sample t-test. Results showed that the NC, UAL, and SP max were significantly higher in snoring group;however RP was found to be significantly lower. Inferior positioning of hyoid bone gives longer measurement for MP-H. In snoring group UAL was found to be significantly different at p ≤ 0.000 between the two genders. All the measured variables showed no significant differences in respect to age. UA CT quantitative features play an important role in the characterization of the anatomy and are compared between snoring patients and non-snoring subjects.

关键词： Snoring Upper Air Way Tract Computerized Tomography