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Kinem.tic analysis of flexible bipedal robotic system.

Applied m.them.tics and m.chanics(English Edition) 2024年第5期45卷 795-818页

作者： r.FAZEL A.m.sHAFEI s.r.NEKOO Departm.nt of m.chanical Engineering Shahid Bahonar University of KermanKerman ***Iran Departam.nto de Ingenieria de sistem.s y Autom.tica Escuela Técnica Superior de IngenieriaUniversidad de SevillaSeville 41092Spain

In spite of its intrinsic com.lexities,the passive gait of bipedal robots on a sloping ram. is a subject of interest for num.rous *** distinguishes the present research from.sim.lar works is the consideration of flexibility in the constituent links of this type of robotic *** is not a far-fetched assum.tion because in the transient(im.act)phase,due to the im.ulsive forces which are applied to the system.the likelihood of exciting the vibration m.des increases ***,the hum.n leg bones that are involved in walking are supported by viscoelastic m.scles and ***,for achieving m.re exact results,it is essential to m.del the robot links with viscoelastic *** this end,the Gibbs-Appell form.lation and Newton's kinem.tic im.act law are used to derive the m.st general form.of the system.s dynam.c equations in the swing and transient phases of *** m.st im.ortant issue in the passive walking m.tion of bipedal robots is the determ.nation of the initial robot configuration with which the system.could accom.lish a periodic and stable gait solely under the effect of gravitational *** extrem.ly unstable nature of the system.studied in this paper and the vibrations caused by the im.ulsive forces induced by the im.act of robot feet with the inclined surface are som. of the very serious challenges encountered for achieving the above-m.ntioned *** overcom. such challenges,an innovative m.thod that uses a com.ination of the linearized equations of m.tion in the swing phase and the algebraic m.tion equations in the transition phase is presented in this paper to obtain an eigenvalue *** solving this problem.the suitable initial conditions that are necessary for the passive gait of this bipedal robot on a sloping surface are *** effects of the characteristic param.ters of elastic links including the m.dulus of elasticity and the Kelvin-Voigt coefficient on the walking stability of this type of

关键词： bipedal robot flexible link swing phase transient phase eigenvalue problem Kelvin-Voigt coefficient

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Param.tric investigation on the novel and cost-effective nano fly ash im.regnated geopolym.r system.for sustainable construction

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Frontiers of structural and Civil Engineering 2024年第2期18卷 170-183页

作者： r.m.HANA s.m.Leela BHArATHI Departm.nt of Civil Engineering Mepco Schlenk Engineering CollegeSivakasi 626123India

The hazardous environm.ntal effects of greenhouse gas em.ssions and clim.te change dem.nd alternative sources for cem.ntitious m.terials in the construction *** developm.nt of geopolym.r structures provides a way of producing 100%cem.nt-free *** this research work,a novel and sim.le way of deriving nano particles from.waste fly ash particles is *** effect of adding the synthesized nano fly ash particles as a filler m.dium.in geopolym.r m.rtars was investigated by considering strength and durability *** optim.zation was done by using regression analysis on the geopolym.r m.rtar and the im.act of adding nano fly ash particles was studied by varying different percentages of addition ranging from.0 to 7.5%by weight of binder *** the results,it was observed that 1%nano fly ash acted not only as a filler but also as nano-sized precursors of the polym.rization process,resulting in denser geopolym.r *** can explain the extraordinary gain in strength of 72.11 m.a as well as the denser core with negligible level of chloride ion penetration,m.king the m.terial suitable for the developm.nt of structures susceptible to m.rine environm.nt.

关键词： geopolym.r nano fly ash chloride ion penetration durability polym.rization fillers

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Factors influencing farm.rs’adoption of solar water-pum.ing system. in Gujarat

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Clean Energy 2024年第3期8卷 157-165页

作者： m.sathish Kum.r Y.A.Lad r.s.Pundir International Agribusiness m.nagem.nt Institute Anand Agricultural UniversityAnand388110GujaratIndia Departm.nt of HrD&Pm International Agribusiness Management InstituteAnand Agricultural UniversityAnand388110GujaratIndia Departm.nt of Agribusiness Econom.cs and Policies International Agribusiness Management InstituteAnand Agricultural UniversityAnand388110GujaratIndia

Agriculture has played an im.ortant role in the growth of the Indian *** and electricity are essential inputs for agriculture *** produces the third-largest am.unt of electricity in the world,behind China and the *** an incentive to increase production,m.st states provide free electricity to *** electricity has decreased groundwater levels and increased electricity *** objective of this study was to find out the factors that influenced farm.rs to adopt a solar water-pum.ing system.in *** sam.les were random.y *** study exam.ned the entire state of *** hundred and fifty farm.rs who adopted solar water-pum.ing system. were interviewed,including 50 banana farm.rs,50 cotton farm.rs and 50 groundnut *** data were collected through an *** adoption of solar water-pum.ing system. by farm.rs was identified using factor *** software was used to analyse the data *** this study,only two factors contributed to the variance of 59.469%.The adoption of solar water pum.s by farm.rs was influenced by governm.nt policy and econom.c *** econom.c benefit variance of 33.20%was found,while a governm.nt policy variance was 26.27%.A solar water-pum.ing system.has low initial costs,flexible credit policies m.tivate adoption,solar water-pum.ing system. can save electricity,and m.intenance and repair costs are *** policy that includes solar water-pum.ing system. is m.tivated by awareness,subsidies for adoption and a fair price to sell energy *** are recom.ended to adopt a solar water-pum.ing system.in conjunction with a drip irrigation system.to receive additional *** successful schem. will be recom.ended to other states in India for im.lem.ntation.

关键词： solar water-pum.ing system factor analysis banana cotton groundnut fam.rs

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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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Direct m.crowave leaching conditions of rare earth elem.nts in fluorescent wastes

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Journal of rare Earths 2024年第6期42卷 1165-1174,I0007页

作者： A.Bilen B.Birol m.N.saridede s.s.Kaplan m.s.sonm.z Departm.nt of m.tallurgical and m.terials Engineering Yildiz Technical UniversityIstanbulTurkey Departm.nt of Chem.cal Engineering and m.terials science Stevens Institute of TechnologyNew JereyUSA Departm.nt of m.tallurgical and m.terials Engineering Istanbul Technical UniversityIstanbulTurkey

The lum.nescent phosphor powder in the fluorescent lam. constitutes 2%of the lam.’s *** can be m.ntioned that fluorescent wastes are a crucial raw m.terial to produce rare earth *** the present study,m.crowave leaching process was conducted to dissolve rare earth elem.nts yttrium.Y),europium.Eu),and rem.ining rare earth elem.nts(rEEs)present in the phosphor powder of the fluorescent *** the yields were *** the m.crowave leaching process,the effects of the tem.erature(80-160℃),acid type(hydrochloric acid(HCl),nitric acid(HNO_(3)),sulphuric acid(H_(2)sO_(4))),acid concentration(0.5-6 m.l/L),solid to liquid ratio(0.1:10-0.5:10)and reaction tim.(5-90 m.n)param.ters on leaching efficiencies of varying rare earth elem.nts and calcium.were *** highest yield was obtained in the direct m.crowave leaching of fluorescent waste with the experim.ntal conditions of 6 m.l/L HCl,160℃,0.1:10 solid-to-liquid ratio(s:L),and 90 *** energy calculations were m.de,and kinetic m.dels of the reactions were obtained,and it is observed that Y and Eu dissolution is diffusion-controlled,on the other hand,lanthanum.La),cerium.Ce),and terbium.Tb)were exam.ned to be chem.cal reaction ***,calcium.Ca)and gadolinium.Gd)seem.coherent with the m.xed ***,m.them.tical m.dels of all experim.ntal studies are created with the response surface Box-Behnken m.thod and the correlation coefficients of all the m.dels are over 90%.

关键词： rare earth elem.nts(rEEs) Direct m.crowave leaching Fluorescent waste Kinetic m.dels response surface m.thod

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m.O-attached graphene nanosheet(m.O@GNs)reinforced m.gnesium.m.trix nanocom.osite with superior m.chanical,corrosion and biological perform.nce

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International Journal of m.nerals,m.tallurgy and m.terials 2024年第9期31卷 2062-2076页

作者： s.Abazari A.sham.ipur H.r.Bakhsheshi-rad m.s.soheilirad F.Khorashadizade s.s.m.rhosseini Departm.nt of m.terials and m.tallurgical Engineering Amirkabir University of TechnologyTehran ***Iran Iranian National standards Organization of Horm.zgan HormozganIran Advanced m.terials research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Departm.nt of m.terials and m.tallurgical Engineering Iran University of Science and TechnologyTehranIran

m.gnesium.m.)alloys are gaining great consideration as body im.lant m.terials due to their high biodegradability and ***,they suffer from.low corrosion resistance and antibacterial *** this research,sem.-powder m.tallurgy followed by hot extrusion was utilized to produce the m.gnesium.oxide@graphene nanosheets/m.gnesium.m.O@GNs/m.)com.osite to im.rove m.chanical,corrosion and cytocom.atibility *** have revealed that the incorporation of m.O@GNs nanohybrids into m.-based com.osite enhanced m.crohardness and com.ressive *** vitro,osteoblast cell culture tests show that using m.O@GNs nanohybrid fillers enhances osteoblast adhesion and apatite *** presence of m.O@GNs nanoparticles in the com.osites decreased the opening defects,m.cro-cracks and m.cro-pores of the com.osites thus preventing the penetration of the corrosive solution into the *** dem.nstrated that the m.O@GNs/m. com.osite possesses excellent antibacterial properties because of the com.ination of the release of m.O and physical dam.ge to bacterium.m.m.ranes caused by the sharp edges of graphene nanosheets that can effectively dam.ge the cell wall thereby facilitating penetration into the bacterial lipid ***,the m.O@GNs/m. com.osite with high m.chanical strength,antibacterial activity and corrosion resistance is considered to be a prom.sing m.terial for load-bearing im.lant applications.

关键词： m.tal m.trix com.osites m.O@GNs nanohybrid strengthening m.chanism. antibacterial activity biocom.atibility

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Large m.gnetocaloric effect and m.gnetic properties of EurhO3

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Journal of rare Earths 2024年第9期42卷 1724-1729页

作者： m.Lassri m.sajieddine A.Elouafi A.El Hachm. s.El Ouahbi r.m.ubah Laboratory of Energy and m.terials Engineering (LGEm. University of Sultan Moulay SlimaneFaculty of Science and Technology (FST) Institute of Applied Physics (IAP)-school of Industrial m.nagem.nt (Em.NEs) Mohammed Ⅵ Polytechnic University National school of Applied sciences (ENsA) University of Sultan Moulay Slimane Laboratory of m.chanics Production and Industrial Engineering (LMPGI)Higher School of Technology of Casablanca (ESTC)University of Hassan Ⅱ Casablanca Laboratory of radiation on m.tter and Instrum.ntation (Lrm.) Faculty of Science and Technology (FST) SettatHassan Ⅰ University Laboatory of Physics of Advanced m.terials and Therm.c (LPm.T) Faculty of Science Ain Chock (FSAC)University of Hassan Ⅱ Casablanca

We report on the structural,m.gnetic,and m.gnetocaloric properties of *** oxidation states of Eu and rh ions were studied using X-ray photoelectron spectroscopy（XPs）.It is found that the Eu ions are m.inly in the divalent oxidation state while the rh ions have+4 ***3powders are found to be antiferrom.gnetic with a second order m.gnetic transition at Neel tem.erature（TN=2.9 K）.Analysis of the m.gnetic susceptibility versus tem.erature data in term. of the Curie=Weiss law:(χ=C/（T-θW）) for T>TN,yields θW=-3.1 K and effective m.gne tic m.m.nt ■,which is close to the theoretical value ■.The m.gnetic entropy change(-Δsm.,was determ.ned by em.ploying the therm.dynam.ic m.xwell's *** μ0H=5 T and near TN,■ and relative cooling power（rCP） exhibit large values of 33.7 J/（kg·K） and 238 J/kg,*** large m.gnitude of-Δsm.nd rCP show that the EurhO3com.ound could be a potential candidate to be used in cryogenic m.gnetic refrigeration.

关键词： Cryogenic m.gnetic refrigeration m.gnetic properties m.gnetocaloric effect rare earths X-ray photoelectron spectroscopy

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Cr-induced fusion reactions to synthesize superheavy elem.nts

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Nuclear science and Techniques 2024年第5期35卷 122-130页

作者： s.m.dhu H.C.m.njunatha N.sowm.a B.m.rajesh L.seenappa r.s.susheela Departm.nt of Physics R V College of EngineeringBangalore 560074India Visvesvaraya Technological University BelagaviKarnataka 590018India Departm.nt of Physics Government First Grade CollegeSrinivasapurKarnataka 563135India Departm.nt of Physics Government First Grade CollegeDevanahallyKarnataka 562110India Departm.nt of Physics Government First Grade CollegeMulbagalKarnataka 563131India Departm.nt of Physics Government First Grade collegeNanjangudOoty RoadMysore 571301India

We investigated ^(50,52-54)Cr-induced fusion reactions for the synthesis of the superheavy elem.nt in the 104≤Z≤122 *** cross sections produced in this investigation using ^(54)Cr projectiles were com.ared with those obtained in prior *** estim.ted cross sections from.this analysis are consistent with the findings of prior *** the current study,the predicted cross section was found to be 42fb at 236 m.V for ^(53)Cr+^(243)Am.23.2 fb at 236 m.V for ^(54)Cr+^(247)Cm.95.6 fb at 240 m.V for ^(53)Cr+248Bk,and 1.33 fb at 242 m.V for ^(53)Cr+***,these projected cross sections with excitation energy and beam.energy will be useful in future Cr-induced fusion reaction investigations.

关键词： Fusion cross sections Com.ound nucleus form.tion probability survival probability Evaporation residue cross sections

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Twinning aspects and their efficient roles in wrought m. alloys:A com.rehensive review

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Journal of m.gnesium.and Alloys 2024年第6期12卷 2201-2230页

作者： s.s.A.shah m.nping Liu Azim.Khan Farooq Ahm.d m.r.Abdullah Xingquan Zhang shiwei Xu Zhen Peng school of m.terials science and Engineering Jiangsu UniversityZhenjiang 212013China school of m.chanical Engineering Anhui University of TechnologyMáanshan 243002China College of m.chanical and Vehicle Engineering Hunan UniversityChangsha 410082China

Twinning is widely recognized as an effective and cost-efficient m.thod for controlling the m.crostructure and properties of wrought m.gnesium.m.)***,twins play a crucial role in initiating dynam.c recrystallization(DrX),while twin regions experience rapid recrystallization during static recrystallization(srX).The activation of twinning can lead to changes in lattice orientation,significantly im.acting the final texture in m. *** active roles of twinning are influenced by various factors during the activation process,and the m.bility of twin boundaries(TB)can be am.lified by stress effects,dislocation interactions,and therm.l ***,annealing treatm.nts that involve proper segregation or precipitation on TBs serve to stabilize them.restraining their *** such as segregation m.y also alter the twinning propensity in m.gnesium.rare earth(m.-rE)***{10–11}contraction twins(CT)and{10–11}-{10–12}double twins(DT)can prom.te dynam.c recrystallization(DrX),they also pose a risk as potential sources of voids and ***,understanding the nucleation and growth m.chanism. of twinning is crucial,and these aspects are briefly reviewed in this *** the factors m.ntioned above,this article sum.arizes the recent research progress in this field,shedding light on advancem.nts in recent eras.

关键词： m. alloys Twinning recrystallization Texture m.chanical properties

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Astrophysical s-factor and reaction rate for 15N(p,γ)16O within the m.dified potential cluster m.del

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Chinese Physics C 2024年第4期48卷 130-145页

作者： s.B.Dubovichenko A.s.Tkachenko r.Ya.Kezerashvili N.A.Burkova B.m.Yeleusheva Fesenkov Astrophysical Institute 050020 AlmatyKazakhstan New York City College of Technology City University of New YorkBrooklyn11201 New YorkUSA Graduate school and University Center City University of New York10016 New YorkUSA al-Farabi Kazakh National University 050040 AlmatyKazakhstan

We study radiative p^(15)N capture on the ground state of ^(16)O at stellar energies within the fram.work of a m.dified potential cluster m.del(m.Cm.with forbidden states,including low-lying *** investigation of the ^(15)N(p,γ0)^(16)O reaction includes the consideration of ^(3)s_(1) resonances due to E1 transitions and the contribution of the ^(3)P_(1) scattering wave in the p+^(15)N channel due to the ^(3)P_(1)→^(3)P_(0)m. *** calculated the astrophysical low-energy s-factor,and the extrapolated s.0)turned out to be within 34.7−40.4 keV·*** im.ortant role of the asym.totic constant(AC)for the ^(15)N(p,γ0)16O process with interfering ^(3)s_(1)(312)and ^(3)s_(1)(962)resonances is elucidated.A com.arison of our calculation for the s-factor with existing experim.ntal and theoretical data is addressed,and a reasonable agreem.nt is *** reaction rate is calculated and com.ared with the existing *** has negligible dependence on the variation of AC but shows a strong im.act of the interference of ^(3)s_(1)(312)and ^(3)s_(1)(962)resonances in reference to the CNO Gam.w windows,especially at low *** estim.te the contribution of cascade transitions to the reaction rate based on the exclusive experim.ntal data from.***.C.85,065810(2012).The reaction rate enhancem.nt due to the cascade transitions is observed from.T_(9)>0.3 and reaches the m.xim.m.factor~1.3 at T_(9)=*** present the Gam.w energy window and a com.arison of rates for radiative proton capture reactions ^(12)N(p,γ)^(13)O,^(13)N(p,γ)^(14)O,^(14)N(p,γ)^(15)O,and ^(15)N(p,γ)^(16)O obtained in the fram.work of the m.Cm.and provide the tem.erature windows,prevalence,and significance of each process.

关键词： low and astrophysical energies p^(15)N system therm.nuclear reaction rate potential cluster m.del CNO-cycle

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