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Novel Mechanical Interface Design for Automotive Starting Systems

Automotive Innovation 2019年第1期2卷 14-25页

作者： alvaro c.michelotti Jonny c.da Silva Lauro c.Nicolazzi Research and Development Department Zen S.A.Industria MetalurgicaBrusqueSC 88355-100Brazil cTc-EMc-UFSc Universidade Federal de Santa Catarina(UFSC)P.O.Box 476FlorianópolisSC 88040-900Brazil

Stop-start vehicles(SSVs)represent a potential alternative for improving internal combustion engine(IcE)*** provide IcEs with the functionality of turning the engine off during traffic halts and restarting it without intervention by the *** strategy reduces fuel consumption,especially in dense urban traffic areas,and contributes to emissions reduction to meet green emissions *** most widely adopted SSV system has a mechanical interface to connect the electric starter motor to the IcE,which requires increased robustness compared with standard starting *** requirement allows the motor to withstand a higher number of engine start cycles compared with a standard starting ***,it is a critical problem for wider adoption of *** SSV systems usually are based on the conventional starting system,its durability and noise remains a critical issue to be addressed by *** typical pinion-ring gear interface uses intermittent gear meshing to form a transient coupling *** research reported here presents the development of an innovative mechanical interface for starting systems,called the permanent coupling(Pc)-type interface,which reduces noise and increases durability compared with the existing *** results obtained by a functional prototype of the Pc-type mechanical interface confirm the feasibility of the proposed *** methodology is based on a product development process integrated with lumped-parameter modeling and virtual simulation aimed at reducing failures during prototype *** new mechanical interface was proven to be a good candidate for increasing the use of SSVs in the automotive market.

关键词： Starting systems Internal combustion engines Stop-start vehicles Mechanical interface Lumped-parameter simulation

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corrosion Behavior of Ψ and β Quasicrystalline Al–cu–Fe Alloy

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Acta Metallurgica Sinica(English Letters) 2015年第9期28卷 1117-1122页

作者： alvaro Torres Sergio Serna cristobal Patio Gerardo Rosas Facultad de ciencias Químicas e Ingeniería P.A. Ing.Mecnica UAEM Av. Universidad 1001 Col. Chamilpa62210 Cuernavaca Mor. Mexico centro de Investigación en Ingeniería y ciencias Aplicadas UAEM Av. Universidad 1001 Col. Chamilpa62210 Cuernavaca Mor. Mexico Facultad de Ingeniería Universidad Autónoma del CarmenCampus Ⅲ Avenida Central S/N Esq. con Fracc. MundoMaya C.P. 24115 Ciudad del Carmen Campeche Mexico Instituto de Investigaciones Metalurgicas UMSNH Edificio U. Ciudad Universitaria Morelia Mich. 58000 Mexico

Two nanostructured A1-cu-Fe alloys, A164cu24Fe12 and A162.5cu25.2Fe12.3, have been studied. Icosahedral quasicrystalline （ψ） A164cH24FeI2 and crystalline cubic （ β） ***25.2Fe12.3 cylindrical ingots were first produced using normal casting techniques. High-energy mechanical milling was then conducted to obtain β icosahedral and β intermetallic nanostructured powders. Electrochemical impedance spectroscopy, linear polarization resistance, and potentiodynamic polarization were used to investigate the electrochemical corrosion characteristics of the powders in solutions with different pH values. current density （icorr）, polarization resistance （Rp）, and impedance modulus （121） were determined. The results showed that regardless of pH value, increasing the solution temperature enhanced the corrosion resistance of the both phases. However, the electrochemical behavior of the phase indicated that its stability depends on the submerged exposure time in neutral and alkaline environments. This behavior was related to the type of corrosion products present on the surfaces of the particles along with the diffusion and charge-transfer mechanisms of the corrosion process.

关键词： Nano-quasicrystalline AI-cu-Fe alloy Mechanical alloying corrosion

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Analytical approximations to a generalized forced damped complex Duffing oscillator:multiple scales method and KBM approach

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communications in Theoretical Physics 2023年第2期75卷 18-27页

作者： Weaam Alhejaili alvaro H Salas S A El-Tantawy Department of Mathematical Sciences College of SciencePrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh 11671Saudi Arabia Department of Mathematics and Statistics Universidad Nacional de ColombiaFIZMAKO Research GroupColombia Department of Physics Faculty of SciencePort Said UniversityPort Said 42521Egypt Research center for Physics(RcP) Department of PhysicsFaculty of Science and ArtsAl-MikhwahAl-Baha UniversitySaudi Arabia

In this investigation,some different approaches are implemented for analyzing a generalized forced damped complex Duffing oscillator,including the hybrid homotopy perturbation method(H-HPM),which is sometimes called the Krylov-Bogoliubov-Mitropolsky(KBM)method and the multiple scales method(MSM).All mentioned methods are applied to obtain some accurate and stable approximations to the proposed problem without decoupling the original *** obtained approximations are discussed graphically using different numerical values to the relevant ***,all obtained approximate solutions are compared with the 4thorder Runge-Kutta(RK4)numerical *** maximum residual distance error(MRDE)is also estimated,in order to verify the high accuracy of the obtained analytic approximations.

关键词： complex Duffing oscillators forced damped complex oscillator multiple scales method KBM method

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Foraging, feeding, and physiological stress responses of wild wood mice to increased illumination and common genet cues

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current Zoology 2018年第4期64卷 409-417页

作者： alvaro NAVARRO-cASTILLA Isabel BARJA Mario DíAZ Department of Biology Faculty of Sciences Universidad Autónoma de Madrid C/Darwin 2 Campus Universitario de Cantolanco Madrid 28049 Spain Department of Biogeography and Global change Museo Nacional de Ciencias Naturales CSIC Madrid 28006 Spain

In nature, animals are exposed to a broad range of threats imposed by predators, which may strongly influence the ecology of prey species directly or indirectly by affecting their behavior via fear of predation. Here, we studied wood mice Apodemus sylvaticus behavioral and physiological responses to simulated predation risk. Risk avoidance was analyzed by live trapping with control traps and traps treated with feces of common genet Genetta genetta （direct cue of risk） under new moon nights and following by simulated full moon conditions （indirect cue）. The time devoted to foraging behavior and capture time were analyzed by video recording mice activity around traps. Food intake was calculated based on the amount of bait remaining in each trap. Fecal cortico- sterone metabolites （FcMs） were measured by enzyme-immunoassay as indicators of physio- logical stress responses. Fewer wood mice were captured during full moon, yet only non-breeding adult males clearly avoided common genet odor. Mice were captured sooner at night during the simulated full moon conditions and later in predator-treated traps. Foraging activity was lower when individuals faced predator＇s feces, but neither food intake nor FcM levels were affected by predation risk cues. Direct and indirect cues of predation risk selectively affected wood mice behavior, although behavioral responses seem to be modulated by different costs-benefit balances related to the individual＇s perception of risk. The lack of physiological responses to predation risk cues suggests that wood mice did not perceive them as reliable stressors or the response was too small or transient to be measured by FcM.

关键词： common genet fecal predator cues feeding foraging moonlight predator avoidance

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Simultaneous Raman and reflection UV/Vis absorption spectroelectrochemistry

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Nano Research 2022年第6期15卷 5340-5346页

作者： Sheila Hernandez Juan V.Perales-Rondon Aranzazu Heras alvaro colina Department of chemistry Universidad de BurgosPza.Misael Banuelos s/ñBurgos E-09001Spain Department of Analytical chemistry Physical Chemistry and Chemical EngineeringUniversity of Alcala.Ctra.Madrid-BarcelonaKm.33.600MadridAlcaláde Henares E-28871Spain

In the present work,a new combination of Raman and ultraviolet and visible(UV/Vis)absorption spectroelectrochemistry in reflection mode is *** new experimental setup allows obtaining the two kinds of spectroscopic data without interferences concomitantly with the electrochemical *** the best of our knowledge,it is the first time to report the simultaneous obtention of electrochemical,electronic,and vibrational information in the same *** new combination provides time-resolved information about the processes that are taking place on the electrode/solution interface which has significant implications in different fields of chemistry,such as modification of electrodes,studies of electrocatalytic reaction mechanisms,development of sensors,among *** different systems were used to demonstrate the advantages and capabilities of the brand-new technique,namely,the oxidation of potassium ferrocyanide,an out-sphere system that is usually employed in the validation of SEc techniques,and the electrochemical-surface enhanced Raman spectroscopy(Ec-SERS)detection of crystal violet by in-situ formation of the silver SERS substrate,where the UV/Vis spectra were used to follow the formation of the SERS substrate,whereas the Raman response of a probe molecule was used to confirm either the formation of a nanostructured surface and to obtain the fingerprint of the molecule with a high time *** brand-new experimental setup has shown to be useful,versatile,robust,compact,and easy to use for future applications.

关键词： spectroelectrochemistry surface enhanced Raman spectroscopy(SERS) Raman ultraviolet and visible(UV/Vis)absorption nanoparticles

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Supramolecular gating of guest release from cucurbit[7]uril using de novo design

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npj computational Materials 2022年第1期8卷 172-179页

作者： Hugues Lambert alvaro castillo Bonillo Qiang Zhu Yong-Wei Zhang Tung-chun Lee Institute of High Performance computing A*STAR1 Fusionopolis WayConnexis Tower138632SingaporeSingapore Department of chemistry Christopher Ingold BuildingUniversity College London(UCL)20 Gordon StreetLondonWC1H 0AJUK Institute for Materials Discovery University College London(UCL)LondonUK Institute of Materials Research and Engineering A*STAR2 Fusionopolis WayInnovis Tower138634SingaporeSingapore

Herein we computationally explore the modulation of the release kinetics of an encapsulated guest molecule from the cucurbit[7]uril(cB7)cavity by ligands binding to the host *** uncovered a correlation between the ligand-binding affinity with cB7 and the guest residence time,allowing us to rapidly predict the release kinetics through straightforward energy minimization *** high-throughput predictions in turn enable a Monte-carlo Tree Search(McTS)to de novo design a series of cap-shaped ligand molecules with large binding affinities and boosting guest residence times by up to 7 orders of ***,halogenated aromatic compounds emerge as top-ranking *** modeling suggests the presence of halogen-bonding between the ligands and the cB7 ***,the binding of top-ranked ligands is supported by^(1)H NMR and 2D *** findings open up possibilities in gating of molecular transport through a nanoscale cavity with potential applications in nanopore technology and controlled drug release.

关键词： release kinetics straight

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Physical activation of graphene: An effective, simple and clean procedure for obtaining microporous graphene for high-performance Li/S batteries

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Nano Research 2019年第4期12卷 759-766页

作者： Almudena Benitez alvaro caballero Julian Morales Jusef Hassoun Enrique Rodriguez-castellon Jesus canales-Vazquez Dpto. Quimica Inorganica e Ingenieria Qutmica Instituto de Quimica Fina y Nanoquimica Universidad de Cordoba 14071 Cordoba Spain Departm ent of chemical and Pharmaceutical Sciences University of Ferrara Via Fossato di Mortara 17 44121 Ferrara Italy Dpto. de Quimica Inorganica Cristalografia y Mineralogia Facultad de Ciencias Universidad de Malaga 29071 Malaga Spain Instituto de Energias Renovables Universidad de Castilla-La Mancha Paseo de La Investigacion 1 Albacete 02071 Spain

Graphe ne nano sheets are a promising scaffold to accommodate S for achievi ng high performa nee Li/S battery. Nano sheet activation is used as a viable strategy to induce a micropore system and further improve the battery performance. Accordingly, chemical activation methods dominate despite the need of multiple stages, which slow down the process in addition to making them tiresome. Here, a three-dimensional (3D) N-doped graphene specimen was physically activated with cO2, a clean and single step process, and used for the preparation of a sulfur composite (A-3DNG/S). The A-3DNG/S composite exhibited outstanding electrochemical properties such as an excellent rate capability (1,000 mAh·g^-1 at 2c), high reversible capacity and cycling stability (average capacity ~ 800 mAh·g^-1 at 1c after 200 cycles), values which exceed those measured in chemically activated graphene. Therefore, these results support the use of physical activation as a simple and efficient alternative to improve the performance of carbons as an S host for high-performance Li-S batteries.

关键词： physical activation 3D-graphene solvothermal microwave synthesis Li-S battery

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Validation of ERA5-Land temperature and relative humidity on four Peruvian glaciers using on-glacier observations

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Journal of Mountain Science 2022年第7期19卷 1849-1873页

作者： BONSHOMS Martí UBEDA Jose LIGUORI Giovanni KORNER Philipp NAVARRO alvaro cRUZ Rolando Departamento de Geografía Universidad Complutense de MadridMadrid 28040Spain Guías de Espeleología y Montana Torremocha del Jarama 28189Spain Department of Physics and Astronomy University of BolognaBologna 40127Italy School of Earth Atmosphere and EnvironmentMonash UniversityMelbourne 3800Australia Institute of Hydrology and Meteorology Technische Universitat DresdenDresden 01737Germany ESRI-Espana Madrid 28037Spain Area de Evaluación de Glaciares y Lagunas.Autoridad Nacional del Agua Huaraz 02002Peru

Weather and climate conditions drive the evolution of tropical glaciers which play an important role as water reservoirs for Peruvian inhabitants in the arid coast and semi-arid Andean *** scarcity of long-term high-quality observations over Peruvian glaciers has motivated the extensive use of reanalysis data to describe the climatic evolution of these ***,the representativeness and uncertainties of these reanalysis products over these glaciers are still poorly *** study evaluates the ability of the ERA-Land reanalysis(ERAL)to reproduce hourly and monthly 2 m air temperature and relative humidity(T2m and Rh2m,respectively)over several Peruvian *** compared the ERAL with data from four on-glacier automatic weather stations(AWS),whose hourly time series were completed with nearby stations,for the period January 2017 to December *** indicates a better performance of the reanalysis for T2m(r>0.80)than for Rh2m(~0.4cycle influenced by the presence of the *** influence is more prominent during the dry months when the so-called glacier damping and cooling effects are *** a monthly time scale,the ERAL validation for both parameters are better in wet outer tropical sites(RMSE between±0.2℃ for T2m and between 3%-7% for Rh2m)rather than in dry outer tropical sites(RMSE between±0.2℃ for T2m and between 3%-7% for Rh2m).Among all sites considered in the study,the Rh2m bias is the highest in the cavalca glacier(correlation of 0.81;RMSE 13%,MAE 11% and bias 8.3%)and the lowest in Artesonraju glacier(correlation of 0.96;RMSE 3%;MAE 2.3% and bias-0.8%).Based on certain considerations outlined in this paper,it is appropriate to use ERAL to characterize T2m and Rh2m conditions on Peruvian glaciers,particularly in the wet outer tropics.

关键词： ERA5 Land Tropical glaciers Temperature Relative humidity Peru Validation

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Punctual mutations in 23S rRNA gene of clarithromycinresistant Helicobacter pylori in colombian populations

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World Journal of Gastroenterology 2018年第14期24卷 1531-1539页

作者： Andrés Jenuer Matta Diana carolina Zambrano alvaro Jairo Pazos Registro Poblacional de cáncer de cali Department of Pathology School of Medicine Universidad del Valle Faculty of Education and Sports Sciences Institución Universitaria Escuela Nacional del Deporte Department of Biology Universidad de Nari?o

AIM To characterize punctual mutations in 23S rRNA gene of clarithromycin-resistant Helicobacter pylori(H. pylori) and determine their association with therapeutic *** PcR products of 23S rRNA gene V domain of 74 H. pylori isolates; 34 resistant to clarithromycin(29 from a low-risk gastric cancer(Gc) population: Tumacocolombia, and 5 from a high-risk population: Tuquerrescolombia) and 40 from a susceptible population(28 from Tumaco and 12 from Túquerres) were sequenced using capillary electrophoresis. The concordance between mutations of V domain 23S rRNA gene of H. pylori and therapeutic failure was determined using the Kappa coefficient and Mc Nemar's test was performed to determine the relationship between H. pylori mutationsand clarithromycin ***23S rRNA gene from H. pylori was amplified in 56/74 isolates, of which 25 were resistant to clarithromycin(20 from Tumaco and 5 from Túquerres, respectively). In 17 resistant isolates(13 from Tumaco and 4 from Túquerres) the following mutations were found: A1593 T1, A1653 G2, c1770 T, c1954 T1, and G1827 c in isolates from Tumaco, and A2144 G from Túquerres. The mutations T2183 c, A2144 G and c2196 T in H. pylori isolates resistant to clarithromycin from colombia are reported for the first time. No association between the H. pylori mutations and in vitro clarithromycin resistance was found. However, therapeutic failure of eradication treatment was associated with mutations of 23S rRNA gene in clarithromycin-resistant H. pylori(κ = 0.71).cONcLUSION The therapeutic failure of eradication treatment in the two populations from colombia was associated with mutations of the 23S rRNA gene in clarithromycinresistant H. pylori.

关键词： clarithromycin In vitro resistance Point mutation Helicobacter pylori Gastric cancer 23S rRNA

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[As_(3)M(As_(3)Pb_(3))]^(3−)(M=Nb,Ta):Ternary Heterometallic clusters with Early Transition Metal Atoms and Aromatic[Pb_(3)]^(2−)

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chinese Journal of chemistry 2021年第7期39卷 1953-1957页

作者： cong-cong Shu Lei Qiao alvaro Muñoz-castro Zhong-Ming Sun Tianjin Key Lab for Rare Earth Materials and Applications State Key Laboratory of Elemento-Organic ChemistrySchool of Materials Science and EngineeringNankai UniversityTianjin300350 China Grupo de Química Inorgánicay Materiales Moleculares Facultad de IngenieriaUniversidad Autonoma de ChileEl Llano SubercaseauxSantiago2801 Chile

Main observation and conclusion Two ternary clusters,[As_(3)Nb(As_(3)Pb_(3))]^(3−)1 and[As_(3)Ta(As_(3)Pb_(3))]^(3−)2,were directly extracted from“K_(8)NbPbAs_(5)”and“K_(8)TaPbAs_(5)”intermetallic solid in the presence of ethylenediamine and 2.2.2-crypt,*** 1 and 2,comprising an electron-poor early transition metal-atom Nb or Ta coordinated to a As3 triangle and a bowl-like As_(3)Pb_(3).

关键词： cluster compounds Aromaticity Zintl anions DFT calculation Sandwich structure

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