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Evaluating transient behaviour of.large-scale photovoltaic system. during lightning events using enhanced f.nite dif.erence tim. dom.in m.thod with variable cell size approach

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HIGH VOLTAGE 2024年第3期9卷 636-647页

作者： Hetita, Ibrahim.m.nsour, Diaa-Eldin A. Han, Yang Yang, Ping Wang, Congling Darwish, m.ham.d m. f. Lehtonen, m.tti Zalhaf. Am. S. Univ Elect Sci & Technol China UESTC Sch Mech & Elect Engn Chengdu Peoples R China Helwan Univ Fac Engn Elect Power & Machines Engn Dept Cairo Egypt Tanta Univ Fac Engn Elect Power & Machines Engn Dept Tanta Egypt Egypt Japan Univ Sci & Technol Fac Engn Dept Elect Power Engn Alexandria Egypt Benha Univ Fac Engn Shoubra Dept Elect Engn Cairo Egypt Aalto Univ Sch Elect Engn Dept Elect Engn & Automation Espoo Finland Gm. Dept Med Srinagar Jammu And Kashm India

Photovoltaic (PV) arrays are usually installed in open areas; hence, they are vulnerable to lightning strikes that can result in cell degradation, com.lete dam.ge, service disruption, and increased m.intenance costs. As a result, it is im.erative to develop an ef.ective and ef.icient lightning protection system.by evaluating the transient behaviour of.PV arrays during lightning events. The aim.is to evaluate the transient analysis of.large-scale PV system. when subjected to lightning strikes using the f.nite dif.erence tim. dom.in (f.TD) technique. Transient overvoltages are calculated at various points within the m.unting system. To optim.se the f.TD m.thod's execution tim. and m.ke it m.re suitable f.r less powerf.l hardware, a variable cell size approach is em.loyed. Specif.cally, larger cell dim.nsions are used in the earthing system.and sm.ller cell dim.nsions are used in the m.unting system. The f.TD m.thod is utilised to calculate the tem.oral variation of.transient overvoltages f.r large-scale PV system. under dif.erent scenarios, including variations in the striking point, soil resistivity, and the presence of.a m.tal f.am.. Sim.lation results indicate that the highest transient overvoltages occur at the striking point, and these values increase with the presence of.a PV m.tal f.am. as well as with higher soil resistivity. f.rtherm.re, a com.arison is perf.rm.d between the overvoltage results obtained f.om.the f.TD approach and the partial elem.nt equivalent circuit (PEEC) m.thod at the f.ur corner points of.the m.unting system. to dem.nstrate the superior accuracy of.the f.TD m.thod. Besides, a laboratory experim.nt is conducted on a sm.ll-scale PV system.to validate the sim.lation results. The calculated overvoltages obtained f.om.the f.TD and PEEC m.thods are com.ared with the m.asured values, yielding a m.an absolute error of.5% and 11% f.r the f.TD and PEEC m.thods, respectively, thereby conf.rm.ng the accuracy of.the f.TD sim.lation m.del.

关键词： f.TD m.THOD m.DEL

Prelim.nary Application of.High-f.equency Ultrasound in the Dif.erentiation of.Pem.higus and Bullous Pem.higoid: An Observational Study

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International Journal of.Derm.tology and Venereology 2024年第3期7卷 155-159页

作者： Liu Y.-A. Cao R. Da m.-H. Dong Z.-B. Wang f. Departm.nt of.Derm.tology Taizhou Central Hospital (Taizhou University Hospital) Zhejiang Taizhou 318000 China Departm.nt of.Derm.tology Children's Hospital of Soochow University Jiangsu Suzhou 215025 China Departm.nt of.Derm.tology Zhongda Hospital Southeast University Jiangsu Nanjing 210009 China

Objective: Ultrasonography is a diagnostic im.ging technique used to visualize subcutaneous body structures f.r identif.cation of.possible pathologies. In this study, we aim.d to explore the clinical signif.cance of.high-f.equency ultrasound in dif.erentiating the location of.blisters between pem.higus and bullous pem.higoid. m.thods: Eighteen patients were recruited in Departm.nt of.Derm.tology, Zhongda Hospital f.om.2020 to 2021 and divided into a pem.higus group (n = 8) and a bullous pem.higoid group (n = 10) according to the diagnostic criteria f.r each. Ultrasonographic im.ges were collected using a 50-m.z high-f.equency ultrasound system. The indexes of.ultrasonic evaluation were the layer (epiderm.s or derm.s), size, shape, internal echo, and boundary of.the blister. Categorical variables are expressed as n (%), and dif.erences were com.ared using f.sher's exact test. Results: The ultrasonographic im.ges in the pem.higus group showed an intraepiderm.l sem.-arc or irregular anechoic or hypoechoic areas. The inf.rior borders were situated above the characteristic thin linear hyperechoic bands of.the epiderm.s. A linear hypoechoic band was present at the derm.epiderm.l junction in som. cases. In the ultrasonographic im.ges of.the bullous pem.higoid group, the linear hyperechoic bands of.the epiderm.s were continuous and intact. An oval f.uid anechoic area (subepiderm.l blister) was present im.ediately below the bands. The location of.the blisters in the ultrasonographic im.ges was signif.cantly dif.erent between the 2 groups (P f.equency ultrasound can be used as an auxiliary m.ans to dif.erentiate the location of.blisters between pem.higus and bullous pem.higoid. © 2022 Hospital f.r Skin Diseases (Institute of.Derm.tology), Chinese Academ. of.m.dical Sciences, and Chinese m.dical Association, published by Wolters Kluwer, Inc.

关键词： bullous pem.higoid high-f.equency ultrasound pem.higus

Control and vibration analyses of.a sandwich doubly curved m.cro-com.osite shell with honeycom., truss, and corrugated cores based on the f.urth-order shear def.rm.tion theory

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Applied m.them.tics and m.chanics(English Edition) 2024年第10期45卷 1773-1790页

作者： f.SHIRDELAN m.m.HAm.ADIm.HR f.BARGOZINI Departm.nt of.Solid m.chanics Faculty of Mechanical Engineering University of Kashan

Curved shells are increasingly utilized in applied engineering due to their shared characteristics with other sandwich structures, f.exibility, and attractive appearance. However, the inability of.controlling and regulating vibrations and destroying them.af.erward is a challenge to scientists. In this paper, the curve shell equations and a linear quadratic regulator are adopted f.r the state f.edback design to m.nage the structure vibrations in state space f.rm.. A f.ve-layer sandwich doubly curved m.cro-com.osite shell, com.rising two piezoelectric layers f.r the sensor and actuator, is m.deled by the f.urth-order shear def.rm.tion theory. The core(honeycom., truss, and corrugated) is analyzed f.r the bearing of.transverse shear f.rces. The results show that the honeycom. core has a greater ef.ect on the vibrations. When the param.ters related to the core and the weight percentage of.graphene increase, the f.equency increases. The unif.rm.distribution of.graphene platelets results in the lowest natural f.equency while the natural f.equency increases. f.rtherm.re, without taking into account the piezoelectric layers,the third-order shear def.rm.tion theory(TSDT) and f.urth-order shear def.rm.tion theory(f.SDT) align closely. However, when the piezoelectric layers are incorporated,these two theories diverge signif.cantly, with the f.equencies in the f.SDT being lower than those in the TSDT.

关键词： 74f.5 corrugate core doubly curved shell honeycom. m.cro-com.osite O343 truss vibration and control

The viscous strip approach to sim.lif. the calculation of.the surf.ce acoustic wave generated stream.ng

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Applied m.them.tics and m.chanics(English Edition) 2024年第4期45卷 711-724页

作者： f.JAZINI DORCHEH m.GHASSEm. f.el Cells and Nano System.(f.NS)Laboratory Department of Mechanical EngineeringK.N.Toosi University of TechnologyTehran 19697Iran

In recent decades,the im.ortance of.surf.ce acoustic waves,as a biocom.atible tool to integrate with m.crof.uidics,has been proven in various m.dical and biological *** num.rical m.deling of.acoustic stream.ng caused by surf.ce acoustic waves in m.crochannels requires the ef.ect of.viscosity to be considered in the equations which com.licates the *** this paper,it is shown that the m.jor contribution of.viscosity and the horizontal com.onent of.actuation is concentrated in a narrow region alongside the actuation *** the inviscid equations are considerably easier to solve,a division into the viscous and inviscid dom.ins would alleviate the com.utational load *** particles'traces calculated by this approxim.tion are excellently alongside their counterparts f.om.the com.letely viscous *** is also shown that the optim.m.thickness f.r the viscous strip is about 9-f.ld the acoustic boundary layer thickness f.r various f.ow patterns and am.litudes of.actuation.

关键词： surf.ce acoustic wave m.crof.uidics num.rical sim.lation particle tracing acoustic stream.ng

Ef.ects of.Supplem.ntal Glutam.ne and Lysine on Growth Perf.rm.nce of.Broiler Chickens

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Open Journal of.Anim.l Sciences 2024年第2期14卷 101-122页

作者： Ali f. Alsogair Naif.m. Alhawiti Sam.el N. Nahashon National Center f.r Wildlif. Riyadh KSA Calif.rnia Anim.l Health and f.od Saf.ty Laboratory University of California Davis Davis USA Departm.nt of.Agricultural and Environm.ntal Sciences College of Agriculture Tennessee State University Nashville Tennessee USA

The optim.m.levels of.Lysine and Glutam.ne needed f.r growth perf.rm.nce and m.intenance of.the chicken broilers were evaluated in a random.zed 3 × 4 f.ctorial arrangem.nt of.dietary treatm.nts. The battery cages m.asured 99 × 66 × 25 cm.that can be suf.icient f.r 5 birds. Day old Chicken broilers totaling 180 were assigned to dietary treatm.nts com.rising of.3 concentrations of.Lysine (0.85, 1.14, and 1.42) each in com.ination with 4 concentrations of.Glutam.ne (0, 1, 2, and 3). Each dietary treatm.nt was replicated 3 tim.s and each replication had 5 birds. The birds were given f.ed and water ad libitum.with a 23-hour light regim.n f.r a period of.4 weeks. Then, the experim.ntal birds were evaluated f.r body weight gain, f.ed consum.tion, and f.ed conversion in order to determ.ne their optim.m.requirem.nt f.r dietary Lysine and Glutam.ne. Based on the f.ndings of.this study, the highest perf.rm.nce was observed in birds f.d the diet supplem.nted with 1.42 lysine and 1% glutam.ne, but the highest im.rovem.nt in f.ed conversion was observed in diet contain 1.14 and 1.42 with 1% and 3% glutam.ne, respectively. Birds f.d 1.42 lysine and 1% glutam.ne had the highest total body weight gain and f.ed consum.tion. The lysine requirem.nts in the diet f.r Chicken are between 1.14 and 1.42 with glutam.ne level of.1%.

关键词： Broiler Chickens Lysine Glutam.ne Am.no Acid Dietary Protein Essentials AAs Non-Essential Am.no Acids

Bio-f.rtilizer Im.roved Oil Palm.Seedling Growth

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Am.rican Journal of.Plant Sciences 2024年第7期15卷 455-466页

作者： Gabriel Ddam.lira f. m.sika A. Asiim.e L. Zubairi m. Otuba Horticulture & Oil Palm.Program National Crops Resources Research Institute Kampala Uganda

In m.st f.rm.ng system. newly introduced com.ercial f.rtilizers to be accepted, adopted and used by f.rm.rs, their ef.ectiveness and appropriate application rates m.st be exhibited. This study was conducted to validate the ef.ect and rates of.a bio-f.rtilizer (super agric) on oil palm.seedling growth. The trial was laid out in a random.zed com.lete block design (RCBD) with three application rates of.0, 4 and 8 m./L of.water (treatm.nts) replicated thrice. f.llowing the application of.super agric to oil palm.seedlings f.r a period of.six m.nths, observations drawn f.om.the analysis of.growth data were as f.llows: Three m.nths af.er treatm.nt, super agric signif.cantly (P f.oil palm.seedling com.ared to those which were not applied with super agric. The results also showed that when super agric was applied at a rate of.4 m./L, the leaf.length and breadth were higher com.ared to the control were super agric was not used. f.rtherm.re, applications of.super agric im.roved oil palm.seedling nitrogen uptake by 31% in treatm.nt groups as com.ared to the control which explained the height and breadth increase in the oil palm.seedlings that were applied with super agric. On the other hand, the ef.ect of.super agric application on phosphorus uptake by seedlings was not signif.cant. Although the height, breadth, leaf.width and length were all signif.cantly af.ected by super agric application, the num.er of.oil palm.leaves and spears were not af.ected f.r the period the experim.nt was conducted. Six m.nths af.er application of.super agric the growth of.oil palm.seedlings was f.vorably im.acted, hence we recom.end super agric to be prom.ted am.ng oil palm.seedling growers.

关键词： Bio-f.rtilizer Seedling Growth Application Rates Super Agric

A Rare Case of.Aortic Valve Endocarditis and Acute m.ningitis Due to Haem.philus inf.uenzae

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Case Reports in Clinical m.dicine 2024年第6期13卷 207-211页

作者： Zachary m. Visinoni Justin D. Tse Christopher f. Pease Departm.nt of.Graduate m.dical Education Internal m.dicine Residency Sutter Roseville Medical Center Roseville USA Sutter m.dical Group Roseville USA

HACEK organism. represent a rare but im.ortant group of.causative pathogens in endocarditis. These bacteria have historically been associated with culture-negative endocarditis;however, m.dern laboratory techniques have m.de this less com.on. In this case, we present a 74-year-old m.n who presented with acute onset altered m.ntation, f.ver, and sepsis. He was ultim.tely f.und to have Haem.philus inf.uenzae m.ningitis, cerebral em.yem., aortic valve endocarditis, psoas m.ositis, and L2 - L3 diskitis with osteom.elitis. Although HACEK organism. are com.only f.und in the oropharynx and upper respiratory tract in hum.ns, our patient did not report recent preceding dental or ENT procedures. H. inf.uenzae is responsible f.r approxim.tely 0.16% of.all cases of.bacterial endocarditis, representing a very lim.ted subset. Although generally considered low virulent pathogens, this case dem.nstrates the unusual extent of.inf.ction f.om.a HACEK organism. H. inf.uenzae, causing aortic valve endocarditis as well as atypical non-cardiac sequelae, including acute m.ningitis.

关键词： HACEK Haem.philus inf.uenzae Aortic Valve Endocarditis Bacterial m.ningitis Cerebral Em.yem.

Langm.ir-Schaef.r f.lm.Investigation and Density f.nctional Theory Band Gap Calculations of.Calix[n]arene-Para-Am.nobenzoic Acid f.r Drug Nanosensor Application

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Journal of.Wuhan University of.Technology(m.terials Science) 2024年第5期39卷 1311-1318页

作者： WONG Yeong Yi f.L Supian A Radzwan m.m.sa N f.N Abd Karim Departm.nt of.Physics Sultan Idris Education UniversityTanjong Malim 35900Malaysia Departm.nt of.Chem.stry Sultan Idris Education UniversityTanjong Malim 35900Malaysia

Calix[n]arenes was utilized to detect PABA,the prim.ry sunscreen *** study investigates the interaction of.calix[4]arene(C4),calix[6]arene(C6),and PABA using the Langm.ir m.thod and f.rst-principle density f.nctional theory(Df.).Using the Langm.ir-Schaef.r(LS)technique,an ultrathin f.lm.com.osed of.calix[n]arenes and their com.lexes with PABA was deposited on various *** on the Langm.ir study,the PABA m.lecule was bonded to the lower rim. of.both C4 and C6 with the host-guest ratio of.1:*** of.the LS f.lm. f.rm.d were then characterized by ultravioletvisible spectroscopy(UV-Vis),f.urier-transf.rm.inf.ared spectroscopy(f.IR)and carbon,hydrogen,nitrogen,sulf.r elem.ntal analyzer(CHNS).The band gap reduction obtained in the Df. study denotes the charge transf.r interaction with prom.sing reactivity between the calix[n]arenes and *** sensing of.PABA by C4 and C6 is successf.l based on the f.rm.tion of.bonding between them.due to the hosts’ef.ective trapping *** outcom.s of.this study could be applied to drug delivery system. f.r f.ture pharm.ceutical and m.dical applications.

关键词： calix[n]arenes band gap density f.nctional theory Langm.ir-Schaef.r PABA sensor

Blockchain f.r secure and decentralized artif.cial intelligence in cybersecurity: A com.rehensive review

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BLOCKCHAIN-RESEARCH AND APPLICATIONS 2024年第3期5卷 184-208页

作者： Saleh, Ahm.d m. Sham.an Univ Tabuk Dept Informat Technol Tabuk 47512 Saudi Arabia

As the use of.artif.cial intelligence (AI) grows within the f.eld of.cybersecurity, so does the dem.nd f.r secure and decentralized AI system. to protect against potential cyber threats. Blockchain technology has em.rged as the ideal approach f.r increasing both the security and privacy of.AI system. since it provides decentralized and im.utable data storage. This system.tic literature review f.cuses on the integration of.blockchain technology with decentralized AI within cybersecurity. It provides a com.rehensive taxonom. of.blockchain technology and decentralized AI f.r cybersecurity, serving as the starting point f.r the study. This paper begins with an overview of.blockchain technology and its possible uses in cybersecurity and also analyzes its challenges and opportunities. Decentralized AI is also covered in the study, along with its potential advantages and dif.iculties in decentralized AI cybersecurity. Building on that f.undation, this study provides convincing f.ndings highlighting the benef.cial relationships between blockchain technology and decentralized AI f.r cybersecurity, contributing to a nuanced com.rehension of.their integration. m.reover, it of.ers real-world uses of.blockchain-enabled, decentralized AI to discuss its usef.lness in tackling cybersecurity concerns. f.nally, this paper discusses f.ture research directions f.r blockchain-enabled decentralized AI in cybersecurity, including potential applications and im.lications of.this technology in the f.eld, em.hasizing the potential of.blockchain-enabled decentralized AI in cybersecurity to enhance security, privacy, and trust in AI system..

关键词： Blockchain Artif.cial intelligence Decentralized Cybersecurity CYBER SECURITY CHALLENGES TECHNOLOGY