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Optical magnetic field enhancement using ultrafast azimuthally polarized laser beams and tailored metallic nanoantennas

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Photonics Research 2024年第5期12卷 1078-1092页

作者： RODRIGO MARTIN-hernandez LORENZ GRUNEWALD LUIS SANCHEZ-TEJERINA LUIS PLAJA ENRIQUECONEJERO JARQUE carlos hernandez-garcia SEBASTIAN MAI Grupo de Investigacion en Aplicaciones del Laser y Fotonica Departamento de Fisica AplicadaUniversidad de SalamancaE-37008 SalamancaSpain Unidad de Excelencia en Luz y Materia Estructuradas(LUMES) Universidad de SalamancaE-37008 SalamancaSpain Institute of Theoretical Chemistry Faculty of ChemistryUniversity of Vienna1090 ViennaAustria Vienna Doctoral School in Chemistry(DoSChem) Faculty of ChemistryUniversity of Vienna1090 ViennaAustria Departamento de Electricidad y Electrónica Universidad de Valladolid47011 ValladolidSpain

*** *** thank Valentina Shumakova,Elizaveta Gangrskaia,Alessandra Bellissimo,Audrius Pugzlys,and Andrius Baltu?ka for fruitful discussions and computational support by the Vienna Scientific Cluster(VSC 4).The authors thankfully acknowledge the computer resources at MareNostrum and SCAYLE,and the technical support provided by Barcelona Supercomputing Center(RES-FI-2022-3-0041).R.M.-H.,L.S.-T.,L.P.,E.C.J.,and C.H.-*** funding from the European Research Council(ERC)under the European Union’s Horizon 2020 research and innovation program(Grant Agreement No.851201)and support from Ministerio de Ciencia e Innovación(PID2022-142340NB-I00,PID2019-106910GB-I00).This research was funded in whole or in part by the Austrian Science Fund(FWF)(10.55776/ZK91).For open access purposes,the author has applied a CC BY public copyright license to any author accepted manuscript version arising from this submission.

关键词： metallic polarized discussions

Fourier-Limited Attosecond Pulse from High Harmonic GenerationAssistedbyUlitrafast MagneticFields

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Ultrafast Science 2023年第5期3卷 51-59页

作者： Rodrigo Martin-hernandez Hongtao Hu Andrius Baltuska Luis Plaja carlos hernandez-garcia'I Grupo de Investigacion en Aplicaciones del Lasery Fotonica Departamento de Fisica AplicadaUniversidad de SalamancaE-37008 SalamancaSpain Photonics Institute Technische Universitat WienA-1040 ViennaAustria

One of the main constraints for reducing the temporal duration of attosecond pulses is the attochirp inherent to the process of high-order harmonic generation(HHG).Though the attochirp can be compensated in the extreme-ultraviolet using dispersive materials,this is unfeasible toward x-rays,where the shortest attosecond or even sub-attosecond pulses could be *** theoretically demonstrate that HHG driven by a circularly polarized infrared pulse while assisted by an strong oscillating ultrafast intense magnetic field enables the generation of few-cycle Fourier-limited few attosecond *** such a novel scenario,the magnetic field transversally confines the ionized electron during the HHG process,analogously to a nanowire *** the electron is ionized,the transverse electron dynamics is excited by the magnetic field,acting as a high-energy reservoir to be released in the form of phase-locked spectrally wide high-frequency harmonic radiation during the electron recollision with the parent *** addition,the transverse breathing dynamics of the electron wavepacket,introduced by the magnetic trapping,strongly modulates the recollision efficiency of the electronic trajectories,thus the attosecond pulse *** aftermath is the possibility of producing high-frequency(hundreds of eV)attosecond isolated few-cycle pulses,almost Fourier *** isolated intense magnetic fields considered in our simulations,of tens of kT,can be produced in finite spatial volumes considering structured beams or stationary configurations of counter-propagating state-of-the-art multi-terawatt/petawatt lasers.

关键词： harmonic trapping intense

QSAR Applied to 4-Chloro-3-formylcoumarin Derivatives Targeting Human Thymidine Phosphorylase

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Clinical Complementary Medicine and Pharmacology 2022年第2期2卷 19-29页

作者： Thomas Scior Juan carlos garcia-hernandez Hassan H.Abdallah Christian Alexander Departamento de Farmacia Facultad de Ciencias QuímicasBenemérita Universidad Autónoma de PueblaPuebla 72000Pue.Mexico Chemistry Department College of EducationSalahaddin University ErbilErbil 44001Iraq Division of Cellular Microbiology Research Center Borstel-Leibniz Lung CenterBorstel 23845Germany

Background:Coumarins are secondary metabolites from the phenylpropanoid-type biosynthesis in higher plants.A plethora of potential phytopharmacological activities have been described for derivatives of the coumarin scaffold:hepatoprotective,antineoplastic,antimicrobial,antituberculosis,antiviral,anti-inflammatory anticoagulant,or antithrombotic ***:A computer-based quantitative structure–activity relationships(QSAR)study for a series of 4‑chloro-3-formylcoumarins was carried ***:To this end we generated the 3D models of 17 published coumarin structures,calculated their physicochemical properties(descriptors)to correlate them to their experimentally known biological activities measured as inhibition concentrations to block the target enzyme *** proposed approach used free molecular modeling software and applies our scripts written in the programming language ***:The final multiple regression models achieved satisfactory results with a small number of descriptors–all of which were statistically significant and meaningful in the field of pharmacodynamics to develop new 3-formylcoumarins with enhanced activities targeting the human thymidine phosphorylase ***:On theoretical grounds,our in silico research contributes in a crucial step in the field of complementary *** step is located between in vivo pharmacological observations of plant extracts on ethnopharmacological,preclinical or controlled clinical levels and the need to identify–at an atomic scale–all those plant ingredients responsible for the biological actions under *** simulations shed light on the modification of phyto-medicine’s physicochemical properties to enhance the interaction with their biomolecular target in the patient’s body.

关键词： Coumarin Phytopharmacy R script Linear model Multiple linear regression QSAR

Gone with the wind： Seasonal trends in foraging movement directions for a central-place forager

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Current Zoology 2014年第5期60卷 604-615页

作者： Jesus hernandez-PLIEGO carlos RODRIGUEZ Javier BUSTAMANTE Department of Wetland Ecology Estacion Biologica de Dofiana CSIC c/Amorico Vespucio s/n 41092 Seville Spain Department of Conservation Biology Estacion Biologica de Dofiana C SIC c/Amorico Vespucio s/n 41092 Seville Spain

Lesser kestrels Falco naumanni are migratory central-place foragers that breed in dynamic arable landscapes. After arriving from migration, kestrels have no knowledge of the distribution of crops, and consequently prey, around their colony. The energy demand of pairs increases as breeding season progresses, but at the same time prey abundance, and their knowledge on prey distribution, also increases. Wind can have a strong influence on flight cost and kestrels should try to reduce energy expendi- ture when possible. When prey abundance is low, kestrels have little knowledge of prey distribution, and pairs have no chicks, they could reduce foraging flight cost by leaving the colony with tailwinds. When prey is abundant, knowledge on prey distribu- tion has increased, and chick demand is high, kestrels should fly to the most favorable foraging patches. We analyzed foraging trips directions in a lesser kestrel colony along the breeding season and in relation to wind speed and direction. We recorded 664 foraging trips from 19 individuals using GPS-dataloggers. We found that outward flights direction changed from uniform to a concentrated distribution along the season, as prey abundance and individual experience increased. We also found a temporal trend in the angular difference between outward flights and wind directions, with low values early in the season and then increa- sing as expected, but again low values at the end, contrary to expectation. Results suggest changes in kestrels foraging strategy along the season in relation to wind. Kestrels depart more with tailwinds in exploratory flights early in the season, while there is a spurious coincidence in direction to preferred foraging patches and dominant wind direction at the end [Current Zoology 60 （5）： 604-615, 2014].

关键词： Falco naumanni Movement ecology Foraging behavior Wind effect GPS-dataloggers

The Full Multi-wake Vortex Lattice Method:a detached flow model based on Potential Flow Theory

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Advances in Aerodynamics 2023年第1期5卷 452-477页

作者： Jesus carlos Pimentel-garcia The School of Industrial Aerospace and Audiovisual Engineering of Terrassa(ESEIAAT)Polytechnic University of CataloniaTerrassa 08222Spain

One of the main issues concerning the standard Vortex Lattice Method is its application to partially or fully detached flow conditions,where non-linear aerodynamic characteristics appear as the angle of attack increases and/or the aspect ratio *** order to solve such limitations,a pure numerical approach based entirely on the Vortex Lattice Method concepts has been *** so-called steady“Full Multi-wake Vortex Lattice Method”comes from the main hypothesis that each discretized element on the body’s surface detaches their own wakes *** obtained results match for lift,drag and moment coefficients for the entire aspect ratio range configurations(under straight wakes and inviscid assumptions).Future unsteady versions of such a multi-wake approach could improve the current results obtained through Vortex Element Methods(as vortons or isolated vortex filaments).

关键词： Potential Flow Theory Ideal flow Detached flow Vorticity generation Vortex Lattice Method Kutta condition

Meteorological drought features in northern and northwestern parts of Mexico under different climate change scenarios

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Journal of Arid Land 2017年第1期9卷 65-75页

作者： carlos ESCALANTE-SANDOVAL Pedro NUNEZ-garcia Faculty of Engineering National Autonomous University of Mexico Cd. Universitaria Coyoacan 04510 Mexico

Meteorological drought has been an inevitable natural disaster throughout Mexican history and the northern and northwestern parts of Mexico（i.e., the studied area）, where the mean annual precipitation（MAP） is less than 500 mm, have suffered even more from droughts in the past. The aim of this study was to conduct a meteorological drought analysis of the available MAP data（1950–2013） from 649 meteorological stations selected from the studied area and to predict the drought features under the different IPCC-prescribed climate change scenarios. To determine the long-term drought features, we collected 1×10~4 synthetic samples using the periodic autoregressive moving average（PARMA） model for each rainfall series. The simulations first consider the present prevailing precipitation conditions（i.e., the average from 1950 to 2013） and then the precipitation anomalies under IPCC-prescribed RCP 4.5 scenario and RCP 8.5 scenario. The results indicated that the climate changes under the prescribed scenarios would significantly increase the duration and intensity of droughts. The most severe impacts may occur in the central plateau and in the Baja California Peninsula. Thus, it will be necessary to establish adequate protective measures for the sustainable management of water resources in these regions.

关键词： meteorological drought synthetic simulation climate change water stress evapotranspiration

Laser sintering of Cu nanoparticles on PET polymer substrate for printed electronics at different wavelengths and process conditions

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Frontiers of Mechanical Engineering 2020年第2期15卷 303-318页

作者： Juan carlos hernandez-CASTANEDA Boon Keng LOK Hongyu ZHENG Singapore Institute of Manufacturing Technology Singapore 138634Singapore School of Mechanical Engineering Shandong University of TechnologyZibo 255049China

This study explores the feasibility of different laser systems to sinter screen-printed lines from nonconductive copper nanoparticles(Cu NPs)on polyethylene terephthalate polymer *** materials are commonly used in manufacturing functional printed electronics for large-area ***,optical and thermal characterization of the materials is conducted to identify suitable laser sources and process *** diode(808 nm),Nd:YAG(1064 nm and second harmonic of 532 nm),and ytterbium fiber(1070 nm)lasers are *** parameters for sintering the Cu NPs are identified for each laser system,which targets low resistivity and high processing ***,the quality of the sintered tracks is quantified,and the laser sintering mechanisms observed under different wavelengths are *** considerations are discussed to improve the laser sintering process of Cu NPs.

关键词： laser sintering copper nanoparticles printed electronics

Effluent Zero Release Concept-The Brazilian Experience

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过程工程学报 2006年第4期6卷 691-696页

作者： José carlos Mierzwa Sandra Mara garcia Bello Ivanildo Hespanhol Hydraulic and Sanitation Eng.Dept. Univ.Sao PauloAv.Prof.Almeida Prado83 SoPauloBrazil CEP:05508-900 Navy Technologic Center in Sao Paulo Av.Prof.Lineu Prestes2468 SoPauloBrazilCEP:05508-900

Water scarcity is pushing the government,industries and researchers to the development of new strategies for water and wastewater *** approach aimed at the optimization of the water use and minimization of effluent generation was developed at the Centro Experimental ARAMAR(CEA),a nuclear research facility,located in the State of Sao Paulo,*** scale tests followed by a pilot plant treating effluents from some nuclear research facilities have shown the results leading to the conclusion that the effluent zero release concept is *** on the gathered data,a project of an integrated effluent treatment system focusing on water recovery and environmental effluent release reduction has been developed.

关键词： effluent wastewater treatment zero release

High-refractive index acrylate polymers for applications in nanoimprint lithography

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Chinese Chemical Letters 2020年第1期31卷 256-260页

作者： Yunhui Tang Stefano Cabrini Jun Nie carlos Pina-hernandez State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China The Molecular Foundry LBNLBerkeleyCA 94702United States aBeam Technologies Castro ValleyCA 94546United States

The development of polymeric optical materials with a higher refractive index,transparency in the visible spectrum region and easier processability is increasingly desirable for advanced optical applications such as microlenses,image sensors,and organic light-emitting *** acrylates have a low refractive index(around 1.50)which does not meet the high perfo rmance requirements of advanced optical *** this research,three novel acrylates were synthesized via a facile one-step approach and used to fabricate optical transparent *** of the polymers reveal good optical properties including high transparency(≥90%)in the visible spectrum region and high refractive index values(1.6363)at 550 ***,nanostructures of these acrylate polymers with various feature sizes including nanogratings and photonic crystals were successfully fabricated using nanoimprint *** results indicate that these acrylates can be used in a wide range of optical and optoelectronic devices where nanopatterned films with high refractive index and transparency are required.

关键词： High refractive index Acrylate Facile synthesis Nanostructure Nanoimprint lithography