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Hydrogen storage in a rare-earth perovskite-type oxide La_(0.6)Sr_(0.4)co_(0.2)Fe_(0.8)O_3 for battery applications

Rare Metals 2018年第12期37卷 1003-1013页

作者： John Henao Oscar Sotelo Maura.c.sales-Diaz Lorenzo Martinez-Gomez cONAcYT-ciateq a.c. Av. Manantiales 23-AParque Industrial Bernardo Quintana Instituto de ciencias Fisicas (IcF) Universidad Nacional Autonoma de Mexico (UNAM)-Campus Morelos

Recently, rare-earth perovskite-type oxides with the general formula ABO(A rare earth element, B transition metal, O oxygen) are regarded as promising materials for Ni/oxide batteries due to their hydrogen storage ability. In the present study, the hydrogen storage properties of the rare-earth perovskite-type oxide LaSrcoFeOwere evaluated in alkaline solution and at various temperatures. The hydrogen storage properties were investigated electrochemically by applying galvanostatic charge/discharge currents. Electrochemical pressurecomposition-temperature isotherms were constructed using the Nernst equation. The exchange current density and proton hydrogen diffusion coefficient were ca.c.lated using linear polarization measurements and the potential-step method, respectively. Interestingly, the maximum hydrogen absorption capacity, re-ca.c.lated from the electrochemical capacity, is 1.72 wt% at 333 K and 6 mol·LKOH. In addition, the hysteresis value, ca.c.lated from pressure-composition-temperature isotherms, was429 J·molat 333 K,while the self-discharge rate was about 25% after 24-h storage at open circuit and at 333 K.

关键词： Hydrogen storage Rare earths Perovskites Ni/oxide batteries

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HVOF-sprayed HAp/S53P4 BG composite coatings on an AZ31 alloy for potential applications in temporary implants

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Journal of Magnesium and Alloys 2024年第1期12卷 345-360页

作者： carlos A.Poblano-Salas John Henao Astrid L.Giraldo-Beta.c.r Paola Forero-Sossa Diego German Espinosa-Arbelaez Jorge A.González-Sánchez Luis R.Dzib-Pérez Susana T.Estrada-Moo Idelfonso E.Pech-Pech ciateq a.c. Av.Manantiales 23-AParque Industrial Bernardo QuintanaEl MarquésQuerétaro 76246Mexico cONa.c.T-ciateq a.c. Av.Manantiales 23-AParque Industrial Bernardo QuintanaEl MarquésQuerétaro 76246Mexico cONa.c.T-cinvestav Libramiento Norponiente#2000.Fraccionamiento Real de JuriquillaQuerétaro 76230Mexico Universidad Tecnológica de Querétaro Av.Pie de la Cuesta N°2501Querétaro 76148Mexico cIDESI Av.Playa Pie de la Cuesta No 702Col.San PabloQuerétaro 76125Mexico center for corrosion Resea.c. Autonomous University of CampecheAv.Héroe de Nacozari No.480P.C.24070San Francisco de CampecheCam.Mexico

Bioactive thermal spray coatings produced via high-velocity oxygen fuel spray(HVOF)from hydroxyapatite(HAp)and bioactive glasses(BG)have the potential to be employed on temporary implants due to the ability of both HAp and BG to dissolve and promote osseointegration,considering that both phases have different reaction and dissolution rates under in-vitro *** the present work,75%***-25%wt.S53P4 bioactive glass powders were HVOF-sprayed to obtain HAp/S53P4 BG composite coatings on a bioresorbable AZ31 *** study is focused on exploring the effect of the stand-off dista.c. and fuel/oxygen ratio variation as HVOF parameters to obtain stable structural coatings and to establish their effect on the phases and microstructure produced in those *** characterization techniques,such as scanning electron microscopy,X-ray diffraction,and Fourier transform infrared spectroscopy,were employed to characterize relevant structural and microstructural properties of the composite *** results showed that thermal gradients during coating deposition must be managed to avoid delamination due to the high temperature achieved(max 550℃)and the differences in coefficients of thermal *** was also found that both spraying dista.c. and oxygen/fuel ratio allowed to keep the hydroxyapatite as the main phase in the *** addition,in-vitro electrochemical studies were performed on the obtained HAp/S53P4 BG composite coatings and compared against the uncoated AZ31 *** results showed a significant decrease in hydrogen evolution(at least 98%)when the bioactive coating was applied on the Mg alloy during evaluation in simulated body fluid(SBF).

关键词： coatings composites Thermal spray Temporary implants Hydrogen evolution

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Belt conveyor Transversal Vibration

Belt Conveyor Transversal Vibration

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第十一届IFTOMM世界大会

作者： J. c. Jáuregui-correa.c.S. Lopez-cajún A. Lozano-Guzmán ciateq a.c. Aguascalientes 20355.México Universidad Autónoma de Querétaro Querétaro 76010 México consejo de ciencia y Tecnología del Estado de Querétaro Querétaro 76000 México

＜正＞Belt conveyors are widely used due to the fact that they are more a.c.rate than chain conveyors, and, on the other hand, they have lower cost than other transmission mechanism. Belt conveyors are built with a timing belt and a wide range of attachments design for different applications. Since conveyors are used to position parts in high speed production systems, its dynamic behavior determines the a.c.racy of entire system. High speed mechanisms generate dynamic loads that cause high deformation and vibration problems. In this paper, a method for analyzing belt conveyor systems is presented. The use of this method allows transmission designers analyze the effect of system parameters on the operating conditions. It was found that the speed of the conveyor is limited by transversal vibration. Numerical results were compared with experimental measurements and they show good agreement.

关键词： conveyor vibration Belt vibration Viscoelastic

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Kinematic calibration of precise 6-DOF Stewart platform-type positioning systems for radio telescope applications

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Frontiers of Mechanical Engineering 2013年第3期8卷 252-260页

作者： Juan carlos JUREGUI Eusebio E.HERNNDEZ Ma.c. cEccARELLI carlos LOPEZ-cAJUN Alejandro Ga.c.A División de Estudios de Posgrado Facultad de IngenieríaUniversidad Autónoma de Quéretaro QuéretaroQro.Mexico National Polytechnic Institute IPNSection of Graduate Studies and ResearchESIME-UPTMéxico D.F.Mexico Laboratory of Robotics and Mechatronics University of cassino Italy Universidad Autónoma de Quéretaro Querétaro Qro.México ciateq A.C.AguascalientesAgs.México

The pose a.c.racy of a parallel robot is a function of the mobile platform ***,there is no a single value of the robot’s *** this paper,two novel methods for estimating the a.c.racy of parallel robots are *** the frst method,the pose a.c.racy estimation is ca.c.lated by considering the propagation of each error,i.e.,error variations are considered as a function of the actuator’s *** the second method,it is considered that each actuator has a.c.nstant error at any *** methods can predict pose a.c.racy of precise robots at design stages,and/or can reduce calibration time of existing *** example of a six degree-of-freedom parallel manipulator is included to show the application of the proposed methods.

关键词： pose errors error estimation parallel robot radio telescopes

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