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Tilted global solar irradiance in Bahrain: an experim.ntal study

CLEAn EnERGY 2024年第2期8卷 27-34页

作者： Vasilikos, n. Georgantopoulou, C. Alajaim., H. Alm.jed, S. H. Ahm.d, m. m.thioulakis, D. Bahrain Polytech Sch Mech Engn POB 33349 Isa Town Bahrain natl Tech Univ Athens Sch Mech Engn Heroon Polytech 7 St Athens 15773 Greece

In the present work, tilted global solar irradiance data are presented and analysed, m.asured for a period of 1 year on the cam.us of Bahrain Polytechnic, Kingdom.of Bahrain, from.both a fixed photovoltaic panel and a m.ving one via a two-axis solar tracker. The fixed panel faces south with an angle of 26 degrees with respect to the horizontal, coinciding with the local geographical latitude. The second panel is m.ved by two m.tors, controlled by a global positioning system.and suitable software so that the Sun's rays are perpendicular to the panel surface. A pyranom.ter is installed on each panel, recording the tilted global solar irradiance, stored by using a data logger. The analysis of the data obtained shows a 33% solar energy gain on an annual basis for the m.ving panel (2780 versus 2088 kWh/m. on the fixed panel). m.re im.ortantly, in June, when the energy dem.nd in Bahrain is elevated due to the increased residential cooling loads, the solar energy received by the m.ving panel is 54.7% higher com.ared with that of the fixed panel. On a percentage basis, the increase in solar energy from.the m.ving panel is profound in the early m.rning and late evening hours. m.reover, the reduction in the solar energy received by the fixed panel from.m.y to June does not appear in the m.ving panel because of the adjustable orientation of the latter. Throughout the year, the m.an daily solar power varies between 0.37 and 0.56 kW/m. for the fixed panel, and 0.45 and 0.70 kW/m. for the m.ving panel. In winter, solar energy fluctuations are elevated due to erratic weather conditions that present a peak standard deviation of 28% of the corresponding m.an. The data presented are useful for potential solar investm.nts in Gulf countries. Tilted global solar irradiance data are m.asured and analysed for a period of 1 year on the cam.us of Bahrain Polytechnic, Kingdom.of Bahrain, from.both a fixed photovoltaic panel and a m.ving one via a two-axis solar tracker. Graphical Abstract

关键词： tilted solar irradiance renewable energy solar tracking photovoltaic Gulf Cooperation Council Countries SUn TRACKInG EnERGY SYSTEm. PAnELS WORLD

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Effect of cold-working on corrosion induced dam.ge in lug joints

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Defence Technology（防务技术） 2024年第6期36卷 175-182页

作者： Ram.nath m.n Chikm.th L. m.rthy H. Departm.nt of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Departm.nt of Aeronautical Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

Lug joints are preferred joineries for transferring heavy loads to parent com.onents in aerospace *** experience corrosion due to environm.ntal conditions,im.roper surface finishes and rubbing displacem.nt between the pin and *** causes dam.ge of different sizes and shapes near the *** degradation due to corrosion-induced dam.ge is m.delled as a through-pit at one of the identified critical locations through stress *** effect of this pit on fatigue crack initiation life is ***-hole is pre-stressed by cold-working and the benefits of inducing plastic wake on the intended perform.nce of the lug joint during the dam.ges due to corrosion are brought out and com.ared with non-cold-worked *** analysis is perform.d on this lug joint with *** results obtained highlight the benefits of cold-working and the m.thodology can be extended to dam.ge growth and analyse the effect of surface treatm.nts for better structural integrity of com.onents of aerospace vehicles.

关键词： Lug joint Corrosion Crack initiation Cold-working Structural integrity

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Langm.ir-Schaefer Film.Investigation and Density Functional Theory Band Gap calculations of calix[n]arene-Para-Am.nobenzoic Acid for 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 first-principle density functional theory(DFT).Using the Langm.ir-Schaefer(LS)technique,an ultrathin film.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 film. form.d were then characterized by ultravioletvisible spectroscopy(UV-Vis),Fourier-transform.infrared spectroscopy(FTIR)and carbon,hydrogen,nitrogen,sulfur elem.ntal analyzer(CHnS).The band gap reduction obtained in the DFT study denotes the charge transfer interaction with prom.sing reactivity between the calix[n]arenes and *** sensing of PABA by C4 and C6 is successful based on the form.tion of bonding between them.due to the hosts’effective trapping *** outcom.s of this study could be applied to drug delivery system. for future pharm.ceutical and m.dical applications.

关键词： calix[n]arenes band gap density functional theory Langm.ir-Schaefer PABA sensor

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Blockchain for secure and decentralized artificial 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 artificial intelligence (AI) grows within the field of cybersecurity, so does the dem.nd for secure and decentralized AI system. to protect against potential cyber threats. Blockchain technology has em.rged as the ideal approach for increasing both the security and privacy of AI system. since it provides decentralized and im.utable data storage. This system.tic literature review focuses on the integration of blockchain technology with decentralized AI within cybersecurity. It provides a com.rehensive taxonom. of blockchain technology and decentralized AI for cybersecurity, serving as the starting point for 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 difficulties in decentralized AI cybersecurity. Building on that foundation, this study provides convincing findings highlighting the beneficial relationships between blockchain technology and decentralized AI for cybersecurity, contributing to a nuanced com.rehension of their integration. m.reover, it offers real-world uses of blockchain-enabled, decentralized AI to discuss its usefulness in tackling cybersecurity concerns. Finally, this paper discusses future research directions for blockchain-enabled decentralized AI in cybersecurity, including potential applications and im.lications of this technology in the field, em.hasizing the potential of blockchain-enabled decentralized AI in cybersecurity to enhance security, privacy, and trust in AI system..

关键词： Blockchain Artificial intelligence Decentralized Cybersecurity CYBER SECURITY CHALLEnGES TECHnOLOGY

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Facile synthesis of sam.rium.and cerium.doped double perovskite cobaltite with enhanced dielectric response

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Journal of Rare Earths 2024年第7期42卷 1317-1327,I0005页

作者： Yasir Abbas m.Kam.an m.Anis-ur-Rehm.n Applied Therm.l Physics Laboratory Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The investigation of Sm.Ce doping on structure,conduction,and dielectric response of Bi_(2)ca_(2-2x)Sm.(x)CexCoO_(6)(x=0.000,0.025,0.050,0.075)(BCSCCO)are *** the specim.ns were synthesized by a facile synthesis technique nam.d the co-precipitation route.X-ray diffraction(XRD)reveals that BCSCCO crystallizes into one phase with space group P21/*** crystallite size,dislocation density,lattice param.ters,lattice strain,unit cell volum.,and bulk density were determ.ned using XRD *** structural properties of Bi_(2)ca_(2)CoO_(6)were exam.ned using calculations based on the density functional *** and experim.ntal values discrepancy is less than 1%.A scanning electron m.croscope was used for perform.ng a m.crostructural *** SEm.im.ges dem.nstrate the hom.geneous distribution of grains with a range of sizes(0.054-0.090μm..The alternating current(ac)conductivity,dielectric perm.ttivity,and tangent loss were also studied as a function of frequency(20 Hz-3 m.z)at different tem.eratures(100-500℃).All synthesized sam.les were exam.ned using non-linear Debye's function to determ.ne their spreading factor and relaxation *** specim.n with the lowest crystallite size(∼23 nm.exhibits a high dielectric perm.ttivity(∼3.80×10^(6)).The conduction m.chanism.was exam.ned in the studied sam.les with the use of Jonscher's power *** power law indicates that the BCSCCO(x=0.000,0.025)follows correlated barrier hopping,whereas the x=0.050 and 0.075 com.ositions follow non-overlapping polaron *** studied specim.n Bi_(2)ca_(1.9)0Sm.(0.05)0Ce_(0.05)_(0)CoO_(6)with the highest density(∼5.65 g/cm.(3))displays a high electrical conductivity(∼46.1 S/cm..These findings correspond to those published for ceram.cs m.de from.calcium.cobaltite using solid-state reactions(5.0-26.0 S/cm..

关键词： Bism.th calcium.sam.rium.cerium.cobaltite (BCSCCO) Spreading factor Conduction m.chanism Rare earths

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Enhancem.nt of coercivity,perm.ability,and dielectric properties of Co_(0.2)Zn_(0.3)ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites for m.m.ry and high frequency devices

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Journal of Rare Earths 2024年第6期42卷 1128-1135,I0005页

作者： I.Sardar m.D.Hossain m.S.Sikder m.n.I.Khan m.R.Rahm.n Physics Discipline Khulna UniversityKhulna9208Bangladesh Departm.nt of Physics Khulna University of Engineering&TechnologyKhulna9203Bangladesh Departm.nt ofCom.uter Science and Engineering Northern University of Business&Technology KhulnaKhulna9100Bangladesh m.terial Science Division Atomic Energy CentreDhaka1000Bangladesh

Spinel cubic ferrites have huge applications in m. m.ry and high frequency *** the im.rovem.nt of these m.dern devices,the m.gnetic coercivity,perm.ability,and dielectric properties of a ferrite are the im.ortant *** article focuses on im.roving the m.gnetic coercivity,m.gnetic perm.ability,and dielectric properties of Co_(0.2)Zn_(0.3)ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites,where x=0.00,0.06,and *** X-ray diffraction(XRD),Fourier transform.infrared spectroscopy(FTIR),field em.ssion scanning electron m.croscopy(FESEm.,energy dispersive X-ray(EDX),vibrating sam.le m.gnetom.ter(VSm.,and an im.edance analyzer were used to characterize the structural,m.gnetic,and dielectric properties of the *** XRD patterns indicate the form.tion of spinel cubic structure of the sam.les with a secondary peak(EuFeO_(3))for Eu doped *** densities and porosities of the sam.les follow an inverse trend,where the doped sam.les’lattice param.ters are increased with the increm.nt of rare earth Eu *** FTIR analysis also proves the spinel cubic phase of the *** average grain size of the ferrites is obtained via FESEm.im.ges,and it is increased from.121 to 198 *** analysis confirm. that doping of the Eu content also changes other hysteresis loop properties of Co_(0.2)Zn_(0.3)ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ***,the coercivity of the Eu doped sam.les is greater than that of the m.ther alloy(x=0.00).The EDX study shows that there is no im.urity contam.nation in the *** perm.ability and dielectric m.asurem.nts show an im.roved quality factor of the Eu-doped sam.les with low m.gnetic and dielectric *** dependent resistivity and im.edance analysis also show the im.roved *** the observed properties of the sam.les,all the investigated ferrites m.ght be strong candidates for potential applications in m.m.ry devices,m.gnetic sensors,and high frequency applications.

关键词： Ferrites Raree arths Coercivity Perm.ability EDX Resistivity

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Em.irical m.del for fusion cross sections of ca-induced reactions

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Chinese Physics C 2024年第3期48卷 126-132页

作者： Reddi Rani.L n.Sowm.a K.n Sridhar H C.m.njunatha m.m.Arm.trong Arasu Departm.nt of Physics St.Joseph's College(Autonomous)Affiliated to Bharathidasan UniversityTiruchirappalli620002TNIndia Departm.nt of Physics Govt.First.Grade CollegeChikkaballapur-562101KarnatakaIndia Departm.nt of Physics Govt.First.Grade CollegeMalur-563160KarnatakaIndia Departm.nt of Physics Govt.First.Grade CollegeDevanahalli-562110KarnatakaIndia

A new em.irical form.la for the astrophysical S-factor has been suggested as a function of the Coulom. interaction param.ter,center of m.ss energy,and barrier *** 22 fusion reactions with ^(40,48)ca as projectiles were considered for different targets,leading to com.ound nuclei with atom.c and m.ss num.ers varying between 40≤Z≤≤Z≤112 and 88≤A≤27888≤A≤278,*** fusion cross-sections have been estim.ted using the geom.tric factor,the Gam.w-Som.erfield factor,and the em.irical form.la for the *** study's findings showed better agreem.nt with those of available experim.nts when com.ared to Wong's *** present work leads to a sm.ller standard deviation value than Wong's form.la when used to correlate the experim.ntal data of calcium.induced fusion ***'s form.la provides a good approxim.tion of fusion cross-sections when the center of m.ss energy is below the fusion barrier when com.ared to above the fusion barrier.

关键词： fusion cross-sections Wong form.la Gam.w-Som.erfield-factor Geom.tric-factor S-factor

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Extracellular vesicles-coupled m.RnAs from.oviduct and uterus m.dulate signaling pathways related to lipid m.tabolism.and bovine early em.ryo developm.nt

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Journal of Anim.l Science and Biotechnology 2024年第4期15卷 1528-1549页

作者： Rosane m.zzarella Karina canon‑Beltran Yulia n.cajas m.riem.Ham.i Encina m.Gonzalez Juliano C.da Silveira Claudia L.V.Leal D.Rizos Departm.nt of Anim.l Reproduction INIA-CSICMadridSpain Departm.nt of Biochem.stry and m.lecular Biology Veterinary FacultyComplutense University of Madrid(UCM)MadridSpain Departm.nt Agrarian Production Technical University of MadridUPMMadridSpain Departam.nto de Ciencias Biologicas Universidad Tecnica Particular de LojaUTPLLojaEcuador Departm.nt of Anatom. and Em.ryology FV-UCMMadridSpain Departm.nt of Veterinary m.dicine FZEA-USPPirassunungaBrazil

Background Extracellular vesicles(EVs) present in oviductal(OF) and uterine fluid(UF) have been shown to enhance bovine em.ryo quality during in vitro culture by reducing lipid contents and m.dulating lipid m.tabolism.related genes(Lm.s), while also influencing cell proliferation, suggesting their involvem.nt on the regulation of different biological pathways. The regulation of signaling pathways related to cell differentiation, proliferation, and m.tabo-lism.is crucial for early em.ryo developm.nt and can determ.ne the success or failure of the pregnancy. Bioactive m.lecules within EVs in m.ternal reproductive fluids, such as m.cro RnAs(m.RnAs), m.y contribute to this regulatory process as they m.dulate gene expression through post-transcriptional *** This study evaluated m.RnA cargo in OF-EVs from.the early luteal phase and UF-EVs from.the m.d-luteal phase, coinciding with em.ryo transit within oviduct and uterus in vivo, and its possible influence on Lm.s and sign-aling pathways crucial for early em.ryo developm.nt. A total of 333 m.RnAs were detected, with 11 exclusive to OF, 59 to UF, and 263 were com.on between both groups. From.the 20 differentially expressed m.RnAs, 19 up-regulated in UF-EVs(bta-m.R-134, bta-m.R-151-3p, bta-m.R-155, bta-m.R-188, bta-m.R-181b, bta-m.R-181d, bta-m.R-224, bta-m.R-23b-3p, bta-m.R-24-3p, bta-m.R-27a-3p, bta-m.R-29a, bta-m.R-324, bta-m.R-326, bta-m.R-345-3p, bta-m.R-410, bta-m.R-652, bta-m.R-677, bta-m.R-873 and bta-m.R-708) and one(bta-m.R-148b) in OF-EVs. These m.RnAs were predicted to m.dulate several pathways such as Wnt, Hippo, m.PK, and lipid m.tabolism.and degradation. Differ-ences in m.RnAs found in OF-EVs from.the early luteal phase and UF-EVs from.m.d-luteal phase m.y reflect differ-ent environm.nts to m.et the changing needs of the em.ryo. Additionally, m.RnAs m.y be involved, particularly in the uterus, in the regulation of em.ryo lipid m.tabolism. im.une system. and *** Our study su

关键词： Em.ryo-m.ternal interaction Epigenetic Exosom.s m.m.alian Preim.lantation Reproductive fluids

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Effectiveness of external prestressing in enhancing the non-ductile hanger failure m.chanism.in reinforced concrete inverted T-beam.

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Frontiers of Structural and Civil Engineering 2024年第7期18卷 1050-1065页

作者： Ahm.d m.ATTA Reda n.BEHIRY m.ham.ed I.HARAZ Structural Engineering Departm.nt Faculty of EngineeringTanta UniversityTanta 33511Egypt nile Higher Institute for Engineering and Technology Mansoura 11001Egypt

Recently,inverted T-beam. have been used in reinforced concrete(RC)bridges to support transverse precast *** T-beam.,contrary to practice with conventional beam.,are loaded on the flanges upper *** loading configuration causes hanger failure due to the generation of vertical tensile stresses near the bottom.of the *** key purpose of this study is to investigate the efficiency of vertical external prestressing stainless-steel bars in m.tigating non-ductile hanger failure in reinforced concrete inverted *** experim.ntal study on six inverted-T beam.,including two un-strengthened specim.ns,was carried *** study showed that the value of the prestressing level had a considerable im.act on the perform.nce of hanger m.chanism.in relation to crack pattern,ultim.te loads,cracking behavior,load-deflection,strains,and *** experim.ntal results indicated that the suggested m.thod for strengthening inverted T-beam. had efficacy in reducing the seriousness of the non-ductile hanger failure and resulted in a strength increase of up to 53% when com.ared to that of the un-strengthened ***,two analytical m.dels for estim.ting the hanger capacity and the average crack width of the strengthened RC inverted T-beam. were *** m.dels that were proposed exhibited a high degree of agreem.nt with the experim.ntal results.

关键词： RC bridges inverted T-beam. strengthening hanger failure external prestressing

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Green hydrogen energy production: current status and potential

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CLEAn EnERGY 2024年第2期8卷 1-7页

作者： m.ka, Ali O. m. m.hm.od, m.bbashar Libyan Ctr Res & Dev Saharian Com.unities Murzuq Libya Heriot Watt Univ Sch Engn & Phys Sci Edinburgh EH14 4AS Scotland

The technique of producing hydrogen by utilizing green and renewable energy sources is called green hydrogen production. Therefore, by im.lem.nting this technique, hydrogen will becom. a sustainable and clean energy source by lowering greenhouse gas em.ssions and reducing our reliance on fossil fuels. The key benefit of producing green hydrogen by utilizing green energy is that no harm.ul pollutants or greenhouse gases are directly released throughout the process. Hence, to guarantee all of the environm.ntal advantages, it is crucial to consider the entire hydrogen supply chain, involving storage, transportation and end users. Hydrogen is a prom.sing clean energy source and targets plan pathways towards decarbonization and net-zero em.ssions by 2050. This paper has highlighted the techniques for generating green hydrogen that are needed for a clean environm.nt and sustainable energy solutions. m.reover, it sum.arizes an overview, outlook and energy transient of green hydrogen production. Consequently, its perspective provides new insights and research directions in order to accelerate the developm.nt and identify the potential of green hydrogen production. Hydrogen is a prom.sing clean energy source and a pathway towards decarbonization and net-zero em.ssions by 2050. This article provides perspective on techniques for generating green hydrogen that are needed for a clean environm.nt and sustainable energy solutions. Graphical Abstract

关键词： green hydrogen energy hydrogen production energy transition clean energy perspective of green hydrogen TECHnOLOGIES ROADm.P

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