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A-site ordered state in manganites with perovskite-like structure based on optimally doped compounds Ln0.70Ba0.30MnO3（Ln=Pr,Nd）

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Journal of Rare earths 2019年第11期37卷 1242-1249页

作者： S.V.Trukhanov VA Khomchenko D.V.Karpinsky M.V.Silibin A.V.Trukhanov L.S.Lobanovsky H.Szymczak c.e.botez I.O.Troyanchuk National University of Science and Technology MISiS 119049 MoscowLeninsky Av.4Russia South Ural State University 454080 ChelyabinskLenin Av.76Russia Scientific-Practical Materials Research centre of NASB 220072 MinskBelarus cFisUc Department of PhysicsUniversity of Coimbra3004-516 CoimbraPortugal National Research University of electronic Technology"MIeT 124498 ZelenogradMoscowRussia Institute for Bionic Technologies and engineering I.M.Sechenov First Moscow State Medical University2-4 Bolshaya Pirogovskaya St.119991 MoscowRussia Institute of Physics Polish Academy of Sciences02-668 WarsawPoland The University of Texas at el Paso El PasoTX 79968-0515USA

In this paper,we report on the crystal structure and magnetic properties of the nano structured Baordered phases of rare-earth manganites obtained from the optimally doped solid solutions Ln0.70Ba0.30MnO3(Ln=Pr,Nd).The materials were studied by X-ray diffraction,scanning electron microscopy,energy dispersive spectroscopy and SQUID-magnetometry *** is found that states with different degrees of cation ordering in the A-sublattice of the ABO3 perovskite can be obtained by employing special conditions of chemical *** particular,reduction of the parent compounds results in the formation of a nanocomposite containing ferrimagnetic anion-deficient ordered phase *** of the composite does not change an average size of the nanocrystallites,but drastically alters their phase composition to stabilize ferromagnetic stoichiometric ordered phase LnBaMn2O6 and ferromagnetic superstoichiometric disordered phase Ln0.90Ba0.10MnO3+δ.It is shown that the magnetic properties of the materials are determined by the joint action of chemical(cation ordering)and external(surface tension)pressures.

关键词： Ionic order Magnetic transition Perovskite Manganite Rare earths

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Modeling novel methodologies for unmanned aerial systems–Applications to the UAS-S4 ehecatl and the UAS-S45 Bálaam

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chinese Journal of Aeronautics 2019年第1期32卷 58-77页

作者： Maxime Alex Junior KUITcHe Ruxandra Mihaela botez eTS Laboratory of Active ControlsAvionics and AeroServoElasticity LARCASE

The rising demand for Unmanned Aerial Systems(UASs) to perform tasks in hostile environments has emphasized the need for their simulation models for the preliminary evaluations of their missions. The efficiency of the UAS model is directly related to its capacity to estimate its flight dynamics with minimum computational resources. The literature describes several techniques to estimate accurate aircraft flight dynamics. Most of them are based on system identification. This paper presents an alternative methodology to obtain complete model of the S4 and S45 unmanned aerial systems. The UAS-S4 and the UAS-S45 models were divided into four sub-models, each corresponding to a specific discipline: aerodynamics, propulsion, mass and inertia, and actuator. The‘‘aerodynamic" sub-model was built using the Fderivatives in-house code, which is an improvement of the classical DATcOM procedure. The ‘‘propulsion" sub-model was obtained by coupling a two-stroke engine model based on the ideal Otto cycle and a Blade element Theory(BeT) analysis of the propeller. The ‘‘mass and the inertia" sub-model was designed utilizing the Raymer and DATcOM methodologies. A sub-model of an actuator using servomotor characteristics was employed to complete the model. The total model was then checked by validation of each submodel with numerical and experimental data. The results indicate that the obtained model was accurate and could be used to design a flight simulator.

关键词： Aerodynamics Aerospace propulsion Flight dynamics Unmanned aerial vehicles modeling

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Status and prospects for symmetric organic redox flow batteries

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Journal of energy chemistry 2025年第1期100卷 125-143页

作者： Md Al Raihan c.Adam Dyker Department of chemistry University of New Brunswick

As environmental concerns from fossil fuel consumption intensify, large-scale energy storage becomes imperative for the integration of renewable sources like wind, hydro, and solar with the electrical *** flow batteries, particularly those employing organic molecules, are positioned as a key technology for this purpose. This review explores the growing field of symmetric organic redox flow batteries(ORFBs) within this context. Unlike traditional asymmetric designs based on unique active materials for each electrode, symmetric ORFBs involve a single bipolar species for both electrodes. This review highlights the benefits of a symmetric design, and categorizes five distinct classes of organic bipolar molecules used in both aqueous and non-aqueous solvents. By providing a comprehensive overview of their cell cycling and performance characteristics, the strengths and weaknesses of the diverse categories of bipolar molecules are highlighted for both solvent systems, as are opportunities for future development. This should guide new research directions and advance the development of practical symmetric ORFBs.

关键词： Redox flow battery Symmetric battery Organic battery Aqueous electrolyte Non-aqueous electrolyte

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A new non-linear vortex lattice method:Applications to wing aerodynamic optimizations

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chinese Journal of Aeronautics 2016年第5期29卷 1178-1195页

作者： Oliviu Sugar Gabor Andreea Koreanschi Ruxandra Mihaela botez LARcASe Laboratory of Applied Research in Active controls Avionics and Aeroservoelasticity cole de Technologie Supérieure

This paper presents a new non-linear formulation of the classical Vortex Lattice Method （VLM） approach for calculating the aerodynamic properties of lifting surfaces. The method accounts for the effects of viscosity, and due to its low computational cost, it represents a very good tool to perform rapid and accurate wing design and optimization procedures. The mathematical model is constructed by using two-dimensional viscous analyses of the wing span-wise sections, according to strip theory, and then coupling the strip viscous forces with the forces generated by the vortex rings distributed on the wing camber surface, calculated with a fully three-dimensional vortex lifting law. The numerical results obtained with the proposed method are validated with experimental data and show good agreement in predicting both the lift and pitching moment, as well as in predicting the wing drag. The method is applied to modifying the wing of an Unmanned Aerial System to increase its aerodynamic efficiency and to calculate the drag reductions obtained by an upper surface morphing technique for an adaptable regional aircraft wing.

关键词： Aerodynamic design Aerodynamic optimization enhanced potential method Morphing wing Nonlinear vortex latticemethod Quasi-3D aerodynamic method UAS optimization

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Design and experimental testing of a control system for a morphing wing model actuated with miniature BLDc motors

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chinese Journal of Aeronautics 2020年第4期33卷 1272-1287页

作者： Teodor Lucian GRIGORIe Shehryar KHAN Ruxandra Mihaela botez Mahmoud MAMOU Youssef MéBARKI eTS Laboratory of Active ControlsAvionics and AeroServoElasticity LARCASEMontreal H3C-1K3QuebecCanada Military Technical Academy"Ferdinand I" Bucharest 040531Romania Aerodynamics Laboratory NRC AerospaceNational Research Council CanadaOttawa K1A0R6OntarioCanada

The paper deals with the design and experimental validation of the actuation mechanism control system for a morphing wing *** experimental morphable wing model manufactured in this project is a full-size scale wing tip for a real aircraft equipped with an *** morphing actuation of the model is based on a mechanism with four similar in house designed and manufactured actuators,positioned inside the wing on two parallel *** of the four actuators used a BrushLess Direct current(BLDc)electric motor integrated with a mechanical part performing the conversion of the angular displacements into linear *** following have been chosen as successive steps in the design of the actuator control system:(A)Mathematical and software modelling of the actuator;(B)Design of the control system architecture and tuning using Internal Model control(IMc)methodology;(c)Numerical simulation of the controlled actuator and its testing on bench and wind *** morphing wing experimental model is tested both at the laboratory level,with no airflow,to evaluate the components integration and the whole system functioning,but also in the wind tunnel,in the presence of airflow,to evaluate its behavior and the aerodynamic gain.

关键词： BLDc motor control tuning Morphing wing Simulation and experimental testing Wind tunnel

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A hybrid original approach for prediction of the aerodynamic coefficients of an ATR-42 scaled wing model

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chinese Journal of Aeronautics 2016年第1期29卷 41-52页

作者： Abdallah Ben Mosbah Ruxandra Mihaela botez Thien My Dao Department of Automated Production engineering Ecole de Technologie SuperieureUniversity of QuebecLaboratory of Applied Research in Active ControlsAvionics and AeroServoElasticity LARCASEMontrealQuebec H3C-1K3Canada Department of Mechanical engineering Ecole de Technologie SuperieureUniversity of QuebecMontrealQuebec H3C-1K3Canada

A new approach for the prediction of lift, drag, and moment coefficients is presented. This approach is based on the support vector machines （SVMs） methodology and an optimization meta-heuristic algorithm called extended great deluge （eGD）. The novelty of this approach is the hybridization between the SVM and the eGD algorithm. The eGD is used to optimize the SVM parameters. The training and validation of this new identification approach is realized using the aerodynamic coefficients of an ATR-42 wing model. The aerodynamic coefficients data are obtained with the XFoil software and experimental tests using the Price-Paidoussis wind tunnel. The predicted results with our approach are compared with those from the XFoil software and experimental results for different flight cases of angles of attack and Mach numbers. The main pur- pose of this methodology is to rapidly Predict aircraft aerodynamic coefficients.

关键词： Aerodynamic coefficients estimation extended great deluge Metaheuristic Model identification Optimization Support vector machines Wind tunnel tests

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Seamless morphing trailing edge flaps for UAS-S45 using high-fidelity aerodynamic optimization

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chinese Journal of Aeronautics 2024年第2期37卷 12-29页

作者： Mir Hossein NeGAHBAN Musavir BASHIR Victor TRAISNeL Ruxandra Mihaela botez LARcASe Laboratory of Applied Research in Active controls Avionics and AeroservoelasticityEcole de Technologie SuperieureUniversite du QuebecMontreal H3C1K3Canada

The seamless trailing edge morphing flap is investigated using a high-fidelity steady-state aerodynamic shape optimization to determine its optimum configuration for different flight conditions,including climb,cruise,and gliding descent.A comparative study is also conducted between a wing equipped with morphing flap and a wing with conventional hinged *** optimization is performed by specifying a certain objective function and the flight performance goal for each flight *** the climb rate,extending the flight range and endurance in cruise,and decreasing the descend rate,are the flight performance goals covered in this *** optimum configurations were found for the morphing wing by determining the optimum morphing flap deflection for each flight condition,based on its objective function,each of which performed better than that of the baseline *** was shown that by using optimum configuration for the morphing wing in climb condition,the required power could be reduced by up to 3.8%and climb rate increases by 6.13%.The comparative study also revealed that the morphing wing enhances aerodynamic efficiency by up to 17.8%and extends the laminar ***,the optimum configuration for the gliding descent brought about a 43%reduction in the descent rate.

关键词： Seamless morphing trailing edge flap Aerodynamic optimization Gradient-based optimiza-tion climb flight condition Gliding descent Flight range endurance

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New reference trajectory optimization algorithm for a flight management system inspired in beam search

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chinese Journal of Aeronautics 2017年第4期30卷 1459-1472页

作者： Alejandro MURRIeTA-MeNDOZA Bruce BeUZe Laurane TeRNISIeN Ruxandra Mihaela botez Research Laboratory in Active control Avionics and Aeroservoelasticity (LARCASE) Universitd du Quebec (Ecole deTechnologie Superieure - ETS) Montreal H3C 1K3 Canada

With the objective of reducing the flight cost and the amount of polluting emissions released in the atmosphere, a new optimization algorithm considering the climb, cruise and descent phases is presented for the reference vertical flight trajectory. The selection of the reference vertical navigation speeds and altitudes was solved as a discrete combinatory problem by means of a graphtree passing through nodes using the beam search optimization technique. To achieve a compromise between the execution time and the algorithm＇s ability to find the global optimal solution, a heuristic methodology introducing a parameter called ‘‘optimism coefficient was used in order to estimate the trajectory＇s flight cost at every node. The optimal trajectory cost obtained with the developed algorithm was compared with the cost of the optimal trajectory provided by a commercial flight management system（FMS）. The global optimal solution was validated against an exhaustive search algorithm（eSA）, other than the proposed algorithm. The developed algorithm takes into account weather effects, step climbs during cruise and air traffic management constraints such as constant altitude segments, constant cruise Mach, and a pre-defined reference lateral navigation route. The aircraft fuel burn was computed using a numerical performance model which was created and validated using flight test experimental data.

关键词： Beam search commercial aircraft Flight time Flight management system Fuel burn FMS Trajectory optimization

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experimental validation of a new morphing trailing edge system using Price-Pa?doussis wind tunnel tests

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chinese Journal of Aeronautics 2019年第6期32卷 1353-1366页

作者： D.cOMMUNIeR R.M.botez T.WONG Laboratory of Applied Research in Active controls Avionics and AeroServoElasticity (LARCASE)ETS

This paper presents the design and manufacturing of a new morphing wing system carried out at the Laboratory of Applied Research in Active controls, Avionics and AeroServoelasticity(LARcASe) at the eTS in Montréal. This first version of a morphing wing allows the deformation of its trailing edge, denote by Morphing Trailing edge(MTe). In order to characterize the technical impact of this deformation, we compare its performance with that of a rigid aileron by testing in the LARcASe’s price-Pa?doussis subsonic wind tunnel. The first set of results shows that it is possible to replace an aileron by a MTe on a wing, as an improvement was observed for the MTe aerodynamic performances with respect to the aileron aerodynamic *** improvement consisted in the fact that the drag coefficient was smaller, and the lift-to-drag ratio was higher for the same lift coefficient.

关键词： Aerodynamic performances Aileron Morphing wing Trailing edge Wing tunnel tests

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Acquired sensorineural hearing loss,oxidative stress,and microRNAs

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Neural Regeneration Research 2025年第9期20卷 2513-2519页

作者： Desmond A.Nunez Ru c.Guo Division of Otolaryngology–Head&Neck Surgery Department of SurgeryFaculty of MedicineThe University of British ColumbiaVancouverBCCanada Division of Otolaryngology–Head&Neck Surgery Gordon&Leslie Diamond Health Care CentreVancouver General HospitalVancouverBCCanada Faculty of Medicine–The University of British columbia VancouverBCCanada

Hearing loss is the third leading cause of human ***-related hearing loss,one type of acquired sensorineural hearing loss,is largely responsible for this escalating global health ***-induced,ototoxic,and idiopathic sudden sensorineural are other less common types of acquired hearing *** etiology of these conditions is complex and multi-fa ctorial involving an interplay of genetic and environmental *** stress has recently been proposed as a likely linking cause in most types of acquired sensorineural hearing *** non-coding RNA sequences known as microRNAs(miRNAs)have increasingly been shown to play a role in cellular hypoxia and oxidative stress responses including promoting an apoptotic *** hair cell death is a central histopathological finding in sensorineural hearing *** these cells do not regenerate in humans,it underlies the irreversibility of human age-related hearing *** eMBASe,Ovid MeDLINe,Web of Science core collection,and *** databases over the period August 1,2018 to July 31,2023 were searched with"hearing loss,""hypoxamiRs,""hypoxia,""microRNAs,""ischemia,"and"oxidative stress"text words for english language primary study publications or registered clinical *** red clinical trials known to the senior author we re also assessed.A total of 222studies were thus *** excluding duplicates,editorials,retra ctions,secondary research studies,and non-english language articles,39 primary studies and clinical trials underwent full-text *** resulted in 11 animal,in vitro,and/or human subject journal articles and 8 registered clinical trial database entries which form the basis of this narrative *** miR-34a and miR-29b levels increase with age in *** miRNAs were demonstrated in human neuroblastoma and murine cochlear cell lines to target Sirtuin 1/peroxisome proliferato r-activated receptor gamma coactivator-1-alpha(SIRT1/P Gc-1α),SIRT

关键词： hearing loss hypoxia microRNAs oxidative stress sensorineural

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