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Enhancem.nt of coercivity,perm.a.ility,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 applica.ions in m. m.ry and high frequency *** the im.rovem.nt of these m.dern devices,the m.gnetic coercivity,perm.a.ility,and dielectric properties of a ferrite are the im.ortant *** article focuses on im.roving the m.gnetic coercivity,m.gnetic perm.a.ility,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),vibra.ing 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.0}on 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 conta.ina.ion in the *** perm.a.ility and dielectric m.asurem.nts show an im.roved qua.ity 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 applica.ions in m.m.ry devices,m.gnetic sensors,and high frequency applica.ions.

关键词： Ferrites Raree arths Coercivity Perm.a.ility EDX Resistivity

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m.croalgae cultiva.ion in photobioreactors: sustainable solutions for a greener future

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Green Chem.cal Engineering 2024年第4期5卷 418-439页

作者： Shaikh Abdur Razzak Khairul Bahar K.m.Oajedul islam.Abdul Khaleel Ha.iffa m.ham.ed Om.r Faruque S.m.Za.ir hossain m.ham.ad m.hossain Chem.cal Engineering Departm.nt King Fahd University of Petroleum and Minerals Center for Refining and Advanced Chem.cals King Fahd University of Petroleum & Minerals Departm.nt of Chem.cal Engineering University of Bahrain

m.croalgae cultiva.ion in photobioreactors（PBRs） has em.rged as a prom.sing and sustainable approach to address va.ious environm.ntal and energy challenges, offering a m.ltitude of benefits across diverse *** developm.nts in m.croalgae cultiva.ion in photobioreactors have contributed substantially to the developm.nt and optim.za.ion of sustainable bioprocesses. This review presents a com.rehensive analysis of recent innova.ions and breakthroughs in the field of m.croalgae cultiva.ion, with a specific focus on their applica.ion in photobioreactors, aim.d at pa.ing the way for a greener future. This study in-depth exa.ines the advantages of m.croalgae cultiva.ion in photobioreactors, concentra.ing on its effectiveness in wastewater treatm.nt, CO2biorem.dia.ion, and the production of biofuels and high-value products. The review evaluates the effects of light,solar irra.ia.ion, tem.erature, nitrogen and phosphorus concentra.ions in culture m.dia, CO2concentra.ions, and pH on m.croalgae growth perform.nce, including specific growth and biom.ss productivity. The study also exa.ines open system. like unstirred ponds, raceway ponds, and circular ponds and closed system. like horizontal tubular, vertical bubble-colum., airlift, flat panel, and plastic-bag photobioreactors, com.a.ing their pros and cons. To optim.ze m.croalgae cultiva.ion, key factors in photobioreactor design, including photosynthetic efficiencies, light/dark（L/D） cycles, CO2concentra.ions, m.ss transfer, hydrodyna.ics beha.ior, and p H, are extensively investigated. in addition, the review outlines recent developm.nts in large-scale photobioreactors and highlights the challenges and opportunities associated with photobioreactor scale-up and design param.ter optim.za.ion, including genetic engineering and econom.c fea.ibility. This article is a vital resource for researchers, engineers, and industry professionals seeking sustainable bioprocesses and the applica.ion of m.croalgae-based technol

关键词： m.croalgae biom.ss CO 2 biofixa.ion Wastewater treatm.nt Biofuel Photobioreactors

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Predicting the Stitch Density of Finished Fabrics Using Weft Blended Grey Knit Fabrics

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Journal of Textile Science and Technology 2024年第3期10卷 51-63页

作者： Ka.i m.. Elias m.ham.ad Obaidur Rahm.n H. m. Za.ir hossain Departm.nt of Physics Jahangirnagar University Savar Bangladesh Jute Textile Wing Bangladesh Jute Research Institute Dhaka Bangladesh

Stitch density is one of the critical qua.ity param.ters of knit fabrics. This param.ter is closely related to other physical qua.ity param.ters like fabric weight, fabric tightness factor, fiber types, blend ra.io, yarn diam.ter and linear density, and fabric structure. Selecting stitch density (wales per inch, course per inch) is essential to getting the appropriate fabric weight and desired qua.ity. Usually, no rules or assum.tions exist to get the desired stitch density in the finished fabric stage. Fifteen types of blended knit fabrics were prepared to conduct the study. The varying percentages of cotton, polyester, and elastane are incorporated in the blends. Regression analysis and regression ANOVA tests were done to predict the stitch density of finished fabrics. A suitable regression equa.ion is established to get the desired results. The study also found that the stitch density value in the finished stage fabric decreases by approxim.tely 15% com.ared to the stitch density in the grey fabric stage. This study will help the fabric m.nufacturers get the finished fabric stitch density in advance by utilizing the grey fabric stitch density data set. The author expects this research to benefit the knitting and dyeing industry, new researchers, and advanced researchers.

关键词： Wales per inch Course per inch Stitch Density Blended Knit Fabric

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Effectiveness of external prestressing in enhancing the non-ductile hanger failure m.cha.ism.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 *** loa.ing configura.ion causes hanger failure due to the genera.ion 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.tiga.ing 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.cha.ism.in rela.ion to crack pattern,ultim.te loads,cracking beha.ior,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.0}ng the hanger capa.ity 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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Blockchain for secure and decentra.ized artificial intelligence in cybersecurity: A com.rehensive review

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BLOCKCHAiN-RESEARCH AND APPLiCa.iONS 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 decentra.ized Ai system. to protect against potential cyber threats. Blockchain technology has em.rged as the ideal approach for increa.ing both the security and privacy of Ai system. since it provides decentra.ized and im.utable data storage. This system.0}c literature review focuses on the integra.ion of blockchain technology with decentra.ized Ai within cybersecurity. it provides a com.rehensive taxonom. of blockchain technology and decentra.ized 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. Decentra.ized Ai is also covered in the study, along with its potential advantages and difficulties in decentra.ized Ai cybersecurity. Building on that founda.ion, this study provides convincing findings highlighting the beneficial rela.ionships between blockchain technology and decentra.ized Ai for cybersecurity, contributing to a nuanced com.rehension of their integra.ion. m.reover, it offers real-world uses of blockchain-enabled, decentra.ized Ai to discuss its usefulness in tackling cybersecurity concerns. Finally, this paper discusses future research directions for blockchain-enabled decentra.ized Ai in cybersecurity, including potential applica.ions and im.lica.ions of this technology in the field, em.ha.izing the potential of blockchain-enabled decentra.ized Ai in cybersecurity to enhance security, privacy, and trust in Ai system..

关键词： Blockchain Artificial intelligence Decentra.ized Cybersecurity CYBER SECURiTY CHALLENGES TECHNOLOGY

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Developing a two-decadal tim.-record of rice field m.ps using Landsat-derived m.lti-index im.ge collections with a random.forest classifier:A Google Earth Engine based approach

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inform.0}on Processing in Agriculture 2024年第2期11卷 260-275页

作者： W.Ashane m.Fernando i.P.Senanayake Departm.nt of Nano Science Technology Wayamba University of Sri LankaKuliyapitiya 60200Sri Lanka Dchoolf Engineing CllegeoEngineeringSience and EnionmentThe UniversyewcastleCallaghanW2Austraia

Historic m.ps showing the tem.oral distribution of rice fields are im.ortant for precision agriculture,irriga.ion optim.sa.ion,forecasting crop yields,land use m.nagem.nt and form.la.ing ***,m.pping rice felds using tra.itional ground surveys is im.ractical when high cost,tim. and labour requirem.nts are considered,and the availa.ility of such detailed records is *** satellite rem.te sensing appears to be a viable solution,conventional segm.nta.ion and classifica.ion m.thods with spectral bands are often unable to contrast the distinct characteristics between rice fields and other vegeta.ion *** this end,we explored a novel,Google Earth Engine(GEE)based m.ltiindex random.forest(RF)classifica.ion approach to m.p rice fields over two *** im.ges from.2000 to 2020 of two Sri Lankan rice cultiva.ion districts were extracted from.GEE and a m.lti-index RF classifica.ion algorithm.was applied to distinguish the rice *** results showed above 80%accuracy for both training and va.ida.ion,when com.ared against high spa.ial resolution Google Earth *** essence,m.lti-index sam.ling and RF together synergised the com.elling classifca.ion accuracy by effectively capturing vegeta.ion,water(ponding)and soil characteristics unique to the rice felds using a single-click *** m.ps developed in this study were further com.ared against the m.DiS land cover type product(m.D12Q1)and the corresponding superior sta.istics on rice fields dem.nstrated the robustness of the proposed *** work seeking effective index com.ina.ions is recom.ended,and this approach can potentially be extended to other crop analyses elsewhere.

关键词： Google Earth Engine(GEE) im.ge classifica.ion Random.forest m.pping rice fields Tim. series analysis Vegeta.ion index

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Fa.ile synthesis of sam.0}um.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： Ya.ir Abbas m.Kam.an m.a.is-ur-Rehm.n Applied Therm.l Physics Laboratory Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The investiga.ion 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 fa.ile synthesis technique nam.d the co-precipita.ion route.X-ray diffraction(XRD)reveals that BCSCCO crystallizes into one phase with space group P21/*** crystallite size,disloca.ion 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 exa.ined using calcula.ions 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 alterna.ing 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 exa.ined using non-linear Debye's function to determ.ne their sprea.ing factor and relaxa.ion *** specim.n with the lowest crystallite size(∼23 nm.exhibits a high dielectric perm.ttivity(∼3.80×10^(6)).The conduction m.cha.ism.was exa.ined 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 cera.ics m.de from.calcium.cobaltite using solid-state reactions(5.0-26.0 S/cm..

关键词： Bism.th calcium.sam.0}um.cerium.cobaltite (BCSCCO) Sprea.ing factor Conduction m.cha.ism Rare earths

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Beyond Stitches: Analysis of Disease Burden in a Bangladeshi Rm. Factory

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Health 2024年第7期16卷 688-702页

作者： m.0}am.Zam.n Tayeb Ahm.ed Na.ila Binte hossain S. m. Raysul Haque a.iful islam.Joarder Kam.an ul Baset Departm.nt of Procurem.nt SM Group Dhaka Bangladesh Departm.nt of Neurosurgery Bangabandhu Sheikh Mujib Medical University (BSMMU) Dhaka Bangladesh Departm.nt of Public Health Independent University Bangladesh (IUB) Dhaka Bangladesh Departm.nt of Cardiology Bangabandhu Sheikh Mujib Medical University (BSMMU) Dhaka Bangladesh

introduction: Bangladesh has experienced rem.rkable growth in Rm. over the past 25 years. With the knitwear industry providing m.re than 4 m.llion direct jobs, providing better occupa.ional health and safety of workers rem.ins a challenge. Aim.of the study: The aim.of the study was to analyze the disease burden of a Rm. factory, and to highlight occupa.ional health risks. m.thods: A cross-sectional study design was em.loyed for this analysis. A 17-m.nth data entry (January 2020 - m.y 2021) was gathered from.the factory in-house clinic. The socio-dem.graphic and clinical diagnosis entries of 8421 entries were analyzed. Result: The popula.ion of the factory workers is 5370, where 40% (2148) are fem.le workers and 60% (3222) are m.le workers. The m.an age of respondents is 30 years, with a SD of ±7 years. Am.ng the chief com.laints, the m.st com.on was vom.ting (14%;2262) fever (14%;2247), runny nose (11%;1842), cough (9%;1465), and loose m.tion (8%;1364). in the diagnosis categories, gastrointestinal diseases were m.re predom.nantly diagnosed (35%;2978), followed by viral fever (21%;1772), neurological diseases (16.5%;1389) and m.sculoskeletal disorders (9%;768). The average cost of m.dicine for each respondent is BDT 36. The factory covered costs of all m.dica.ion for 99% (8380) of respondents. Only 0.5% (37) was referred to a tertiary hospital for further evalua.ion. Conclusion: Garm.nts workers suffer m.stly from.long-term.occupa.ional health hazards. Factory owners and policy m.kers can contribute in va.ious ways to im.roving prim.ry healthcare options for workers.

关键词： Rm. Disease Burden Work Related Disease Com.unicable Disease Occupa.ional Safety

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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, a.i O. m. m.hm.od, m.bbashar Libyan Ctr Res & Dev Saha.ian 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, transporta.ion and end users. Hydrogen is a prom.sing clean energy source and targets plan pathways towards decarboniza.ion and net-zero em.ssions by 2050. This paper has highlighted the techniques for genera.ing green hydrogen that are needed for a clean environm.nt and sustainable energy solutions. m.reover, it sum.a.izes 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 decarboniza.ion and net-zero em.ssions by 2050. This article provides perspective on techniques for genera.ing 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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Phase com.osition,conductivity,and sensor properties of cerium.doped indium.oxide

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Nano m.terials Science 2024年第2期6卷 193-200页

作者： m.i.ikim.G.N.Gera.im.v V.F.Grom.v O.J.ilegbusi L.i.Trakhtenberg N.N.Sem.nov Federal Research Center for Chem.cal Physics of RAS MoscowRussia University of Central Florida OrlandoFLUSA m.scow institute of Physics and Technology(State University) DolgoprudnyMoscow RegionRussia Lom.nosov m.scow State University MoscowRussia

The hydrotherm.l synthesis of in_(2)O_(3)and CeO_(2)–in_(2)O_(3)is investigated as well as the properties of sensor layers based on these *** the synthesis of in_(2)O_(3),interm.diate products in(OH)_(3)and inOOH are form.d,which are the precursors of stable cubic(c-in_(2)O_(3))and m.tastable rhom.ohedral(rh-in_(2)O_(3))phases,respectively.A transition from.c-in_(2)O_(3)to rh-in_(2)O_(3)is observed with the addition of CeO_(2).The introduction of cerium.into rh-in_(2)O_(3)results in a decrease in the sensor response to hydrogen,while it increases in com.osites based on c-in_(2)O_(3).The data on the sensor activity of the com.osites correlate with XPS results in which CeO_(2)causes a decrease in the concentra.ions of chem.sorbed oxygen and oxygen vacancies in rh-in_(2)O_(3).The reverse situa.ion is observed in com.osites based on c-in_(2)O_(3).Com.ared to in_(2)O_(3)and CeO_(2)–in_(2)O_(3)obtained by other m.thods,the synthesized com.osites dem.nstrate m.0}m.m.response to H_(2)at low tem.eratures by 70–100℃,and have short response tim.(0.2–0.5 s),short recovery tim.(6–7 s),and long-term.sta.ility.A m.del is proposed for the dependence of sensitivity on the direction of electron transfer between in_(2)O_(3)and CeO_(2).

关键词： Cerium.oxide indium.oxide Nanocom.osite Hydrotherm.l m.thod Cubic phase Rhom.ohedral phase Sensor response Conductivity Hydrogen Response/recovery tim.

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