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HVSr analysis of pum.ce sands for sedim.nt depth characterization:A case study for Guadalajara,m.xico

Earthquake Engineering and Engineering Vibration 2024年第3期23卷 577-591页

作者： Hafid Salgado m. Alejandro ram.rez-Gaytan Adolfo Preciado Christian r.Escudero Departam.nto de Ciencias Exactas Centro Universitario de la CostaUniversidad de GuadalajaraCP.48280 Puerto VallartaJaliscoMéxico Departam.nto de Ciencias Com.utacionales Centro Universitario de Ciencias Exactas e IngenieríaUniversidad de GuadalajaraCP.44430 GuadalajaraJaliscoMéxico Departam.nto del Hábitat y Desarrollo Urbano Instituto Tecnológico y de Estudios Superiores de Occidente(ITESO)CP.45604 TlaquepaqueMéxico

The horizontal to vertical spectral ratio(HVSr)m.thodology is used here to characterize pum.ce soils and to im.ge the three-dim.nsional surface geom.try of Guadalajara,*** to other Latin Am.rican cities,Guadalajara is exposed to high seism.c risk,with the particularity of being the largest urban settlem.nt in Latin Am.rica built on pum.ce *** has not yet been tested to characterize subsoil depths in pum.ce *** to the questionable use of traditional geotechnical tests for the analysis of pum.ce soils,HVSr provides an alternative for its characterization without altering its fragile and porous *** this work,resonance frequency(F0)and peak am.litude(A0)are used to constrain the depth of the m.jor im.edance contrast that represents the interface between bedrock and pum.ce *** were com.ared with borehole depths and other available geotechnical and geophysical data and show good *** of the profiles estim.ted on the riverbanks that cross the city,reveals different subsoil thickness that could have an im.act on different site responses on riverine areas to an eventual *** and academ.c efforts are com.ined in this work to characterize depth sedim.nts,an im.ortant param.ter that im.acts the regulations for construction in the city.

关键词： subsoil of Guadalajara shallow soil thickness bedrock depth pum.ce soil characterization

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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： Kum.r, m. Sathish Lad, Y. A. Pundir, r. S. Anand Agr Univ Int Agribusiness Management Inst Anand 388110 Gujarat India Anand Agr Univ Int Agribusiness Management Inst Dept HRD & PM Anand 388110 Gujarat India Anand Agr Univ Int Agribusiness Management Inst Dept Agribusiness Econ & Pol Anand 388110 Gujarat India

Agriculture has played an im.ortant role in the growth of the Indian econom.. Water and electricity are essential inputs for agriculture today. India produces the third-largest am.unt of electricity in the world, behind China and the USA. As an incentive to increase production, m.st states provide free electricity to farm.rs. Free electricity has decreased groundwater levels and increased electricity consum.tion. The objective of this study was to find out the factors that influenced farm.rs to adopt a solar water-pum.ing system.in Gujarat. The sam.les were random.y selected. This study exam.ned the entire state of Gujarat. One 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 farm.rs. Prim.ry data were collected through an interview. The adoption of solar water-pum.ing system. by farm.rs was identified using factor analysis. SPSS software was used to analyse the data collected. In 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 benefits. An 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 affordable. Governm.nt policy that includes solar water-pum.ing system. is m.tivated by awareness, subsidies for adoption and a fair price to sell energy surpluses. Farm.rs are recom.ended to adopt a solar water-pum.ing system.in conjunction with a drip irrigation system.to receive additional incom.. The successful schem. will be recom.ended to other states in India for im.lem.ntation. The factors that influence farm.rs to adopt a solar water-pum.ing system.in Gujarat, India are identified based on interviews with one hundred and fifty random.y sel

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

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Nonlinear dynam.c m.deling of planar m.ving Tim.shenko beam.considering non-rigid non-elastic axial effects

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Applied m.them.tics and m.chanics(English Edition) 2024年第3期45卷 479-496页

作者： m.ABBASI GAVArI m.r.HOm.EINEZHAD Faculty of m.chanical Engineering K.N.Toosi University of TechnologyTehran 19991-43344Iran

Due to the im.ortance of vibration effects on the functional accuracy of m.chanical system.,this research aim. to develop a precise m.del of a nonlinearly vibrating single-link m.bile flexible *** m.nipulator consists of an elastic arm.a rotary m.tor,and a rigid carrier,and undergoes general in-plane rigid body m.tion along with elastic transverse *** accurately m.del the elastic behavior,Tim.shenko’s beam.theory is used to describe the flexible arm.which accounts for rotary inertia and shear deform.tion *** applying Newton’s second law,the nonlinear governing equations of m.tion for the m.nipulator are derived as a coupled system.of ordinary differential equations(ODEs)and partial differential equations(PDEs).Then,the assum.d m.de m.thod(Am.)is used to solve this nonlinear system.of governing equations with appropriate shape *** assum.d m.des can be obtained after solving the characteristic equation of a Tim.shenko beam.with clam.ed boundary conditions at one end and an attached m.ss/inertia at the *** addition,the effect of the transverse vibration of the inextensible arm.on its axial behavior is *** the axial rigidity,the effect m.kes the rigid body dynam.cs invalid for the axial behavior of the ***,num.rical sim.lations are conducted to evaluate the perform.nce of the developed m.del,and the results are com.ared with those obtained by the finite elem.nt *** com.arison confirm. the validity of the proposed dynam.c m.del for the *** to the m.ntioned features,this m.del can be reliable for investigating the system.s vibrational behavior and im.lem.nting vibration control algorithm..

关键词： planar m.ving Tim.shenko beam non-rigid non-elastic axial effect as-sum.d m.de m.thod(Am.) nonlinear m.tion analysis

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Pile foundation in alternate layered liquefiable and non-liquefiable soil deposits subjected to earthquake loading

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 359-376页

作者： Praveen Huded m.Suresh r Dash LEA Associates South East Asia Pvt.Ltd. New Delhi 110044India Indian Institute of Technology Bhubaneswar Khurda 752050India

Pile foundations are still the preferred foundation system.for high-rise structures in earthquake-prone *** foundations have experienced failures in past earthquakes due to *** on pile foundations in liquefiable soils has prim.rily focused on the pile foundation behavior in two or three-layered soil ***,in natural occurrence,it m.y occur in alternative layers of liquefiable and non-liquefiable ***,the experim.ntal and/or num.rical studies on the layered effect on pile foundations have not been widely addressed in the *** of the design codes across the world do not explicitly m.ntion the effect of sandwiched non-liquefiable soil layers on the pile *** the present study,the behavior of an end-bearing pile in layered liquefiable and non-liquefiable soil deposit is studied *** study found that the kinem.tic bending m.m.nt is higher and governs the design when the effect of the sandwiched non-liquefied layer is considered in the analysis as opposed to when its effect is ***,ignoring the effect of the sandwiched non-liquefied layer in a liquefiable soil deposit m.ght be a nonconservative design approach.

关键词： pile foundation liquefaction alternately layered soil fixity effect layered effect

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Kinem.tic analysis of flexible bipedal robotic system.

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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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Control system.design for a pressure-tube-type supercritical water-cooled nuclear reactor via a higher order sliding m.de m.thod

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Nuclear Science and Techniques 2024年第1期35卷 145-154页

作者： m.Hajipour G.r.Ansarifar Departm.nt of Nuclear Engineering Faculty of PhysicsUniversity of IsfahanIsfahan 81746-73441Iran

Nuclear power plants exhibit non-linear and tim.-variable ***,designing a control system.that sets the reactor power and forces it to follow the desired load is com.licated.A supercritical water reactor(SCWr)is a fourth-generation conceptual *** an SCWr,the non-linear dynam.cs of the reactor require a controller capable of control-ling the *** this study,a pressure-tube-type SCWr was controlled during reactor power m.neuvering with a higher order sliding m.de,and the reactor outgoing steam.tem.erature and pressure were controlled *** an SCWr,the tem.erature,pressure,and power m.st be m.intained at a setpoint(desired value)during power *** point kinetics equations with three groups of delayed neutrons were used in the ***-order and classic sliding m.de controllers were separately m.nufactured to control the plant and were com.ared with the PI controllers speci-fied in previous *** controlled param.ters were reactor power,steam.tem.erature,and ***,for these param.ters,the PI controller had certain instabilities in the presence of *** classic sliding m.de controller had a higher accuracy and stability;however its m.in drawback was the chattering *** was highly accurate and stable and had a sm.ll com.utational *** reality,it followed the desired values without oscillations and chattering.

关键词： Supercritical water nuclear reactor Higher order sliding m.de controller Steam.tem.erature Steam.pressure Point kinetics m.del

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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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Astrocytic calcium.waves:unveiling their roles in sleep and arousal m.dulation

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Neural regeneration research 2024年第5期19卷 984-987页

作者： Erxi Wu Dan Qi Dam.r Nizam.tdinov jason H.Huang Departm.nt of Neurosurgery and Neuroscience Institute Baylor Scott&White HealthTempleTXUSA Texas A&m.University School of m.dicine TempleTXUSA Texas A&m.University School of Pharm.cy College StationTXUSA LIVESTrONG Cancer Institutes and Departm.nt of Oncology Dell Medical Schoolthe University of Texas at AustinAustinTXUSA Departm.nt of Neurosurgery Baylor College of MedicineTempleTXUSA

Neuron-astrocyte interactions are vital for the brain’s *** astrocyte activities is crucial for com.rehending the com.lex neural network,particularly the population-level functions of neurons in different cortical states and associated behaviors in *** on anim.l sleep and wakefulness have revealed distinct cortical synchrony patterns between ***,outnum.ering neurons by nearly fivefold,support and regulate neuronal and synaptic *** research on astrocyte activation during cortical state transitions has em.hasized the influence of norepinephrine as a neurotransm.tter and calcium.waves as key com.onents of ion channel *** sum.ary focuses on a few recent studies investigating astrocyte-neuron interactions in m.use m.dels during sleep,wakefulness,and arousal levels,exploring the involvem.nt of noradrenaline signaling,ion channels,and glutam.tergic signaling in different cortical *** findings highlight the significant im.act of astrocytes on large-scale neuronal networks,influencing brain activity and *** astrocytic signaling pathways shows prom.se for treating sleep disorders and arousal *** research is needed to understand astrocytic calcium.signaling in different brain regions and its im.lications for dysregulated brain states,requiring future hum.n studies to com.rehensively investigate neuron-astrocyte interactions and pave the way for therapeutic interventions in sleep-and arousal-related disorders.

关键词： arousal astrocyte calcium.waves locus coeruleus neuron-astrocyte interaction norepinephrine sleep wakefulness

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A 63-Year-Old m.le with D-Transposition of the Great Arteries Who Had an Early Form.of the Arterial Switch Operation

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Congenital Heart Disease 2024年第1期19卷 65-68页

作者： m.chael A.rebolledo Jane S.Yao jason N.Johnson Um.r S.Boston Benjam.n r.Waller III Division of Pediatric Cardiology Department of PediatricsThe University of Tennessee Health Science CenterThe Heart InstituteLe Bonheur Children’s HospitalMemphisUSA College of m.dicine The University of Tennessee Health ScienceMemphisUSA Division of Pediatric Cardiothoracic Surgery Department of SurgeryThe University of Tennessee Health Science CenterHeart InstituteLe Bonheur Children’s HospitalMemphisUSA

We describe a 63-year-old m.le who appears to have undergone an early form.of the arterial switch operation for D-transposition of the great arteries perform.d in the *** review the clinical and im.ging data that support our *** had a diagnostic cardiac catheterization which dem.nstrated severe pulm.nary hypertension responsive to epoprostenol and *** case m.y represent one exam.le of the experim.ntal surgical work done prior to *** Jatene’s description of theﬁrst successful arterial switch perform.d in 1975.

关键词： Adult congenital heart disease arterial switch operation great vessel anom.ly im.ging(all m.dalities)

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Fuel cell stack design and m.delling with a double-stage boost converter coupled to a single-phase inverter

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CLEAN ENErGY 2024年第1期8卷 188-196页

作者： Elnagi, Basem.E. Ism.iel, Ahm.d m. m.nsour, Hany S. E. Abd-Alwahab, m. N. Suez Canal Univ Fac Engn Elect Engn Dept Ismailia 41522 Egypt

A com.rehensive proton-exchange m.m.rane fuel cell stack m.del was developed and integrated with a two-stage DC/DC boost converter. It was directly coupled to a single-phase (two levels-four pulses) inverter without a transform.r. The pulse-width m.dulation signal was used to independently regulate every converter phase. The converter was m.delled using a m.TLAB (r)/Sim.link (r) environm.nt and an appropriate voltage control m.thod. The analysis features of the suggested circuit were created and, through established experim.nts, the sim.lation results were verified. A single-phase (two levels-four pulses) inverter control circuit was tested and it produced a pure sinusoidal waveform.with voltage control. It m.tches the voltage of the network in term. of am.litude and frequency. A sinusoidal pulse-width m.dulation approach was perform.d using a single-phase (two levels-four pulses) pulse-width m.dulation inverter. The results dem.nstrated an enhancem.nt in the standard of the output wave and tuned the dead tim. with a reduction of 63 m. s com.ared with 180 m. s in conventional techniques. A com.rehensive m.del of a proton-exchange m.m.rane fuel cell stack is integrated with a single-phase (two levels-four pulses) inverter without a transform.r. Pulse-width m.dulation is used to independently regulate every converter phase. As a result, the dead tim. is reduced com.ared to conventional techniques. Graphical Abstract

关键词： PEm.fuel cell pulse-width m.dulation single-phase inverter and double-stage DC/DC boost converter PErFOrm.NCE SYSTEm

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