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Real-Tim. Perform.nce Assessm.nt of Operating Photovoltaic (PV) System.

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Energy and Power Engineering 2020年第6期12卷 339-347页

作者： Abdullah m. ALzahrani m.ham.d A. zohdy Departm.nt of Electrical and Com.uter Engineering Oakland University Rochester MI USA

A technology called solar energy is a very prom.sing technique, and is considered as the cleanest and the m.st abundant renewable resource that is naturally available every day. In this paper, a m.TLAB environm.nt has been developed to calculate real-tim. power incidence on a PV system. It tak.s into account the tim., location, PV tilt, and azim.th angles, and weather conditions to estim.te incident power. In this paper, one case study is considered at New York.State location. It has been applied to a newly installed 8 k. residential system.located in Inwood. The solar panels are m.de up of silicon HIT (Heterojunction with Intrinsic Thin Layer) cells by Panasonic and solar cell rated at 19%. The result shows that the system.is perform.ng at its rated efficiency. The calculations involve the determ.nation of direct, diffused and reflected radiation on the panels tak.ng into account the tim. of the day, location, PV area, and orientations and weather conditions. The cloudiness index m.y be estim.ted based on the weather data and included in the calculations. After perform.ng the irradiance calculations, the output power is estim.ted based on the rated efficiency at its tem.erature and com.ared with the generated output power. The real-tim. assessm.nt of a PV system.perform.nce, during the operational tim. m.nitors the health of the PV system. The data obtained by this calculator m.y accom.any production data provided to the consum.r by the utility com.any.

关键词： PV System Irradiance Calculation PV Perform.nce m.thod

Sliding m.de Control for Singularly Perturbed System. Using Accurate Reduced m.del

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International Journal of m.dern Nonlinear Theory and Application 2021年第1期10卷 1-12页

作者： Aym.n E. m. Ahm.d m.ham.d zohdy Research Departm.nt Egyptian Armed Force Cairo Egypt Electrical and System. Engineering Oakland University Rochester MI USA

In order to deal with unm.deled dynam.cs in large vehicle system., which have an ill condition of the state m.trix, the use of m.del order reduction m.thods is a good approach. This article presents a new construction of the sliding m.de controller for singularly perturbed system.. The controller design is based on a linear diagonal transform.tion of the singularly perturbed m.del. Furtherm.re, the use of a single sliding m.de controller designed for the slow com.onent of the diagonalized system.is investigated. Sim.lation results indicate the perform.nce im.rovem.nt of the proposed controllers.

关键词： Singular Perturbation Sliding m.de Control Diagonalization m.thod

m.deling and Sim.lation of a Hybrid Energy Storage System.for Residential Grid-Tied Solar m.crogrid System.

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Journal of Power and Energy Engineering 2017年第5期5卷 28-39页

作者： Abdraham.ne Traore Allan Taylor m. A. zohdy F. Z. Peng Departm.nt of Electrical and Com.uter Engineering Oakland University Rochester MI USA Departm.nt of Electrical and Com.uter Engineering Michigan State University East Lansing MI USA

Present-day power conversion and conditioning system. focus on transferring energy from.a single type of power source into a single type of load or energy storage system.(ESS). While these system. can be optim.zed within their specific topology (e.g. m.PT for solar applications and Bm. for batteries), the topologies are not easily adapted to accept a wide range of power flow operating conditions. With a hybrid approach to energy storage and power flow, a system.can be designed to operate at its m.st advantageous point, given the operating conditions. Based on the load dem.nd, the system.can select the optim.l power source and ESS. This paper will investigate the feasibility of com.ining two types of power sources (m.in utility grid and photovoltaics (PV)) along with two types of ESS (ultra-capacitors and batteries). The sim.lation results will show the im.act of a hybrid ESS on a grid-tied residential m.crogrid system.perform.nce under various operating scenarios.

关键词： m.crogrid Solar Hybrid Energy Storage System. Grid-Tied Renewable Energy System m.deling Batteries

Sem.nal plasm. anti-m.llerian horm.ne level correlates with sem.n param.ters but does not predict success of testicular sperm.extraction （TESE）

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Asian Journal of Andrology 2007年第2期9卷 265-270页

作者： Taym.ur m.stafa m.dhat k. Am.r Guirgis Abdel-m.lak.Taha Abdel Nsser Wael zohdy Shedeed Ashour Dina El-Gayar Hosam.H. Awad Andrology ＆ Sexology Departm.nt Faculty of Medicine Cairo University Cairo 11553 Egypt Adam.International Clinic Mohandesseen Giza 12411 Egypt Artificial Insem.nation and Em.ryo Transfer Departm.nt Reproductive Research Institute Alharam Giza 12111 Egypt Chem.cal Pathology Departm.nt Faculty of Medicine Cairo University Cairo 11553 Egypt

Aim. To assess sem.nal plasm. anti-m.llerian horm.ne （Am.） level relationships in fertile and infertile m.les. m.thods： Eighty-four m.le cases were studied and divided into four groups： fertile norm.zoosperm.a （n = 16）, oligoastheno- teratozoosperm.a （n = 15）, obstructive azoosperm.a （OA）（n = 13） and non-obstructive azoosperm.a （NOA）（n = 40）. Conventional sem.n analysis was done for all cases. Testicular biopsy was done with histopathology and fresh tissue exam.nation for testicular sperm.extraction （TESE） in NOA cases. NOA group was subdivided according to TESE results into unsuccessful TESE （n = 19） and successful TESE （n = 21）. Sem.nal plasm. Am. was estim.ted by enzym. link.d im.unosorbent assay （ELISA） and serum.follicular stim.lating horm.ne （FSH） was estim.ted in NOA cases only by radioim.unoassay （RIA）. Results： m.an sem.nal Am. was significantly higher in fertile group than in oligoasthenoteratozoosperm.a with significance （41.5±10.9 pm.l/L vs. 30.5±10.3 pm.l/L, P 〈 0.05）. Sem.nal Am. was not detected in any OA patients. Sem.nal Am. wascorrelated positively with testicular volum. （r = 0.329, P = 0.005）, sperm.count （r = 0.483, P = 0.007）, sperm.m.tility percent （r = 0.419, P = 0.021） and negatively with sperm.abnorm.l form. percent （r = -0.413, p = 0.023）. Nonsignificant correlation was evident with age （r = -0.155, P = 0.414） and plasm. FSH （ r = -0.014, P = 0.943）. In NOA cases, sem.nal Am. was detectable in 23/40 cases, 14 of them.were successful TESE （57.5%） and was undetectable in 17/40 cases, 10 of them.were unsuccessful TESE （58.2%）. Conclusion： Sem.nal plasm. Am. is an absolute testicular m.rk.r being absent in all OA cases. However, sem.nal Am. has a poor predictability for successful testicular sperm.retrieval in NOA cases.

关键词： sem.nal plasm. anti-m.llerian horm.ne sperm.togenesis azoosperm.a testicular sperm.extraction

Beta-endorphin in serum.and sem.nal plasm. in infertile m.n

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Asian Journal of Andrology 2006年第6期8卷 709-712页

作者： Shawk. El-Haggar Salah El-Ashm.wy Ahm.d Attia Taym.ur m.stafa m.m.Farid Roaiah Ashraf Fayez Sherif Ghazi Wael zohdy Nagwa Roshdy Andrology Departm.nt Clinical Pathology Departm.nt m.dical Biochem.stry Departm.nt Faculty of MedicineCairo UniversityCairo 12311Egypt

Aim. To access beta-endorphin levels in serum.as well as sem.nal plasm. in different infertile m.le groups. m.thods： Beta-endorphin was estim.ted in the serum.and sem.nal plasm. by enzym.-link.d im.unosorbent assay （ELISA） m.thod in 80 infertile m.n equally divided into four groups： non-obstructive azoosperm.a （NOA）, obstructive azoosperm.a （OA）, congenital bilateral absent vas deferens （CBVAD） and asthenozoosperm.a. The results were com.ared to those of 20 norm.zoosperm.c proven fertile m.n. Results： There was a decrease in the m.an levels of betaendorphin in the sem.nal plasm. of all successive infertile groups （m.an ± SD： NOA 51.30 ± 27.37, OA 51.88 ± 9.47, CBAVD 20.36 ± 13.39, asthenozoosperm.a 49.26 ± 12.49 pg/m., respectively） com.ared to the norm.zoosperm.c fertile control （87.23 ± 29.55 pg/m.）. This relation was not present in m.an serum.level of beta-endorphin between four infertile groups （51.09 ± 14.71, 49.76 ± 12.4, 33.96 ± 7.2, 69.1 ± 16.57 pg/m., respectively） and the fertile control group （49.26 ± 31.32 pg/m.）. The CBVAD group showed the lowest sem.nal plasm. m.an level of beta-endorphin. Testicular contribution of sem.nal beta-endorphin was estim.ted to be approxim.tely 40%. Sem.nal beta-endorphin showed significant correlation with the sperm.concentration （r = 0.699, P = 0.0188） and nonsignificant correlation with its serum.level （r = 0.375, P = 0.185） or with the sperm.m.tility percentage （r = 0.470, P = 0.899）. Conclusion： The estim.tion of beta-endorphin alone is not conclusive to evaluate m.le reproduction as there are m.ny other opiates acting at the hypothalam.c pituitary gonadal axis.

关键词： azoosperm.a beta-endorphin m.le infertility opioid peptides sem.n sem.nal plasm.

Sliding m.de Control for Singularly Perturbed System. Using Accurate Reduced m.del

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辐射接枝剑麻纤维的表面形态机械性能和染色性能

International Journal of m.dern Nonlinear Theory and Application（现代非线性理论与应用） 2021年第1期

作者： Aym.n E. m. Ahm.d m.ham.d zohdy

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麻纺织技术 1997年第1期20卷 44-48页

作者： A.m.EL-Naggar m.B.EL-Hosam. A.H.Zahran m.H.zohdy 肖仁亮

通过扫描电子显微镜(SEm.研究了未处理和经酸碱处理的剑麻纤维的表面形态。还观察了苯乙烯和丙烯酸乙酯共聚单体接枝剑麻的表面结构。观察到碱处理使剑麻纤维原纤化而转变成单纤维,而酸处理则显示出原纤化作用是则于晶体内的膨胀所致。... 详细信息

通过扫描电子显微镜(SEm.研究了未处理和经酸碱处理的剑麻纤维的表面形态。还观察了苯乙烯和丙烯酸乙酯共聚单体接枝剑麻的表面结构。观察到碱处理使剑麻纤维原纤化而转变成单纤维,而酸处理则显示出原纤化作用是则于晶体内的膨胀所致。机械试验表明未处理和经处理和剑麻不论是在何种辐射气氛下进行辐射处理其韧度都变差。而且,用上述的共聚单体进行接枝对于剑麻纤维的机构性能有显著的影响。还研究了接枝剑麻纤堆对于不同染料的杂色性能。地于大事性染料和直接染料其吸收量在低的接枝度时稍有增加,随着接枝率的提高其吸收量则降低。但是,对于分散染料随着接枝率的增加其吸收量增加。

关键词：辐射接枝剑麻纤维机械性能染色性能麻纤维