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Black-box Modeling of Converters in Renewable Energy Systems for EMC Assessment:Overview and Discussion of Available Models

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Chinese Journal of Electrical Engineering 2022年第2期8卷 13-28页

作者： Lu Wan abduselam h.beshir Xinglong Wu Xiaokang Liu Flavia Grassi Giordano Spadacini Sergio A.Pignari Department of Electronics Information and BioengineeringPolitecnico di MilanoMilan 20133Italy

The development of renewable energy systems interfaced with the grid by power electronic converters leads to increasing issues of electromagnetic coexistence between power and communication lines,as well as severe power quality issues,such as total harmonic distortion at the consumer ***,high-frequency modeling of renewable energy systems is of great importance to guide the design and development of distribution networks involving renewable *** to system complexity,black-box modeling approaches offer more advantages than traditional circuit modeling,as far as electromagnetic compatibility(EMC)analysis and filter design are the *** this study,different black-box modeling techniques for power converters are introduced and systematically ***,the general theory of black-box modeling is ***,three different modeling approaches are compared in terms of accuracy and the required experimental ***,the possible limitations of black-box modeling of power converters are investigated and discussed.

关键词： Renewable energy system black-box modeling electromagnetic compatibility(EMC) conducted emission(CE)

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Prominence Activity during the 2006 Total Solar Eclipse

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Natural Science 2018年第4期10卷 135-141页

作者： beshir Marzouk National Research Institute of Astronomy and Geophysics (NRIAG) 11421 Helwan Cairo Egypt

During total solar eclipses, we can observe the outer atmospheric layers of the sun (chromosphere and corona). The solar corona extends to several solar radii depending on the sunspot cycle. Basic coronal structures such as polar streamers, helmet type structures were?observed?during the 2006 total solar eclipse. Our total solar eclipse 2006 observations through?both White light corona and h-Alpha filter allowed us to describe coronal structures and Prominence Activity. We found that the solar corona is extended to 4 times of solar radii, the existence different zones of white light corona were shown, moreover, we compared the defined features of solar corona at different observing locations along the track of total solar eclipse 2006. The solar limb activity was studied during both of partial and total eclipse phases by using h-Alpha and white light observations from Salloum, Egypt. We got same prominence activity during partial and total phases of the solar eclipse and recorded three prominences on solar limb. Finally, our processed image in a good agreement with the published?processed images?was?observed from different locations along the track of total eclipse,?added, similar magnetic field structure shown in our processed image and published one.

关键词： Total Solar Eclipse Coronal and Chromospheric Structures Prominence Activity White Light Corona

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Efficiency and patient experience with propofol vsconventional sedation:A prospective study

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World Journal of Gastrointestinal Endoscopy 2016年第4期8卷 232-238页

作者： Patrick Thornley Mohammad Al beshir James Gregor Andreas Antoniou Nitin Khanna Michael G.DeGroote School of Medicine MsMaster UniversityHamiltonOntario L8S 4L8Canada Division of Gastroenterology King Fahad Specialist Hospital-DammamDammam 31444Saudi Arabia Division of Gastroenterology Western UniversityLondonOntario N6A 3K7Canada Department of Anesthesia and Perioperative Medicine Western UniversityLondonOntario N6A 3K7Canada

AIM: To determine whether anaesthesiologistadministered sedation with propofol(AAP) or endoscopist-administered conscious sedation(EAC) with fentanyl/midazolam shortens colonoscopy duration/total room time. METhODS: This is a prospective, non-randomized, comparative study that enrolled patients greater than 18 years of age undergoing colonoscopy in a single Canadian academic outpatient endoscopy unit over a three-month consecutive period. Colonoscopies in this unit are performed both with AAP and EAC. Patient demographics, procedure-related data and adverse events were documented. Additionally, the level of procedure difficulty, and whether a staff endoscopist, trainee with assistance, or independent trainee, performed the procedure were documented. A validated modified 4-question, 5-point Likert scale telephone survey was used to assess patient satisfaction with colonoscopy. The telephone patient satisfaction survey was conducted 24-72 h following the ***: Two hundred and thirty patients were enrolled during the study period with 126 patients in the AAP group and 104 patients in the EAC group. Mean procedure time was 18.3 ± 10.1 min in the AAP group and 14.7 ± 7.1 min in the EAC group(P = 0.002). Mean total room time was 36.8 ± 13.7 with AAP and 30.1 ± 11 min with EAC(P he use of AAP(P = 0.002), resident participation(P herapeutic interventions(P hesiologist class(P = 0.016), to be predictors of longer total room time. Patient age and gender were not significant predictors. After excluding cases in which trainees were involved, there was no significant difference in procedure time between the two groups(P = 0.941), however total room time was still prolonged in the AAP group(P = 0.019). The amount of pain experienced was lower with AAP(P = 0.02), with a trend toward overall higher patient sa

关键词： Patient satisfaction Fentanyl Colonoscopy Midazolam Propofol

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