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3D printing of ABS *** of processing and effects of multi-wall and single-wall carbon nanotubes on thermal,mechanical and electrical properties

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Journal of Materials Science & Technology 2022年第26期121卷 52-66页

作者： Sithiprumnea Dul Brenda J.Alonso Gutierrez Alessandro Pegoretti Jaime Alvarez-Quintana Luca Fambri Department of Industrial Engineering and INSTM Research Unit University of TrentoTrento 38123Italy Centro de Investigación en Materiales Avanzados S.C.Unidad MonterreyApodaca 66600Mexico Facultad de Ingeniería Mecánica y Eléctrica Universidad Autónoma de Nuevo LeónAvenida Universidad s/nCiudad UniversitariaSan Nicolás de los Garza 66451México

The following paper reports on a comparative study of the effects of two types of carbon nanotubes,namely multiwall(MWCNT)and single-wall(SWCNT)carbon nanotube,on the properties of 3D-printed parts produced with acrylonitrile-butadiene-styrene(ABS)nanocomposites with various CNT loadings of5-10 wt.%.Quasi-static tensile properties and Vicat softening temperature of 3D-printed parts were enhanced with the increasing CNT *** highest enhancement in tensile properties was observed for the ABS/CNT nanocomposites at 10 wt.%filler loading.3D-printed ABS/SWCNT composites showed higher tensile modulus,better creep stability and higher Vicat ***,the strength of ABS/SWCNT 3D samples is relatively lower than that of ABS/*** addition,3D-printed parts exhibited anisotropic electrical conductive behaviour,which has a conductivity of through-layer of about2-3 orders of magnitude higher than *** highest conductivity of 3D-printed samples reached25.2 S/m,and 9.3 S/m for ABS/MWCNT and ABS/SWCNT composites at 10 wt.%,*** results obtained,*** successful fuse filament fabrication and the consequent electromechanical properties,confirm that these 3D printable nanocomposite could be properly utilized for the production,and application up to about 90°C,of thermoelectric devices and/or resistors for flexible circuits.

关键词： Fuse filament fabrication Conductive polymers Nanocomposites Mechanical properties Creep behavior Resistivity

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Understanding root-zone soil moisture in agricultural regions of Central Mexico using the ensemble Kalman filter,satellite-derived information,and the THEXMEX-18 dataset

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International Journal of Digital Earth 2022年第1期15卷 52-78页

作者： Héctor Ernesto Huerta-Bátiz Daniel Enrique Constantino-Recillas Alejandro Monsiváis-Huertero Juan Carlos Hernández-Sánchez Jasmeet Judge Ramón Sidonio Aparicio-García Escuela Superior de Ingeniería Mecánica y Eléctrica Unidad Ticomán Instituto Politécnico NacionalMexico CityMexico Escuela Superior de Ingeniería Mecánica y Eléctrica Unidad Zacatenco Instituto Politécnico NacionalMexico CityMexico Tecnológico Nacional de México-TESE EcatepecMexico Department of Agricultural and Biological Engineering University of FloridaGainesvilleFLUSA

An Ensemble Kalman Filter(EnKF)-based assimilation algorithm was implemented to estimate root-zone soil moisture(RZSM)using a Soil-Vegetation-Atmosphere Transfer(SVAT)model during a complete growing season of corn in Central *** and field soil moisture(SM)observations and NASA SMAP SM retrievals were used to understand the effect of vertically spatial updates and uncertainties in meteorological forcings on RZSM *** of RZSM every 3 days using SM observations at 4 depths lowered the averaged standard deviation(ASD)and the root mean square error(RMSE)by 60%and 50%,respectively,compared to the open-loop *** assimilation of synthetic SM at the top 0-5 cm obtained RZSM closer to observations compared to THEXMEX-18 SM measurements and SMAP SM *** between EnKF estimates and SM observations and SMAP SM retrievals are mainly due to misrepresentation of vegetation *** results improved SM estimates up to 10-cm depth using SMAP SM retrievals;however,additional studies are needed to improve SM at deeper *** implemented methodology can estimate SM at the top 10 cm of the soil every 3 days to mitigate the impact of the climate change on agricultural production over rainfed areas,particularly in developing countries.

关键词： Root-zone soil moisture SVAT model ensemble kalman filter soil moisture active-Passive(SMAP)mission agricultural region THEXMEX-18 central Mexico

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Detection of leaf structures in close-range hyperspectral images using morphological fusion

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Geo-Spatial Information Science 2017年第4期20卷 325-332页

作者： Gladys Villegas Wenzhi Liao Ronald Criollo Wilfried Philips Daniel Ochoa Department of Telecommunications and Information Processing Ghent University-imec Ghent Belgium Facultad de Ingeniería en Eléctrica y Computación ESPOL Polytechnic University Escuela Superior Politécnica del Litoral Guayaquil Ecuador

Close-range hyperspectral images are a promising source of information in plant biology,in particular,for in vivo study of physiological *** this study,we investigate how data fusion can improve the detection of leaf elements by combining pixel reflectance and morphological *** detection of image regions associated to the leaf structures is the first step toward quantitative analysis on the physical effects that genetic manipulation,disease infections,and environmental conditions have in *** tested our fusion approach on Musa acuminata (banana) leaf images and compared its discriminant capability to similar techniques used in remote *** results demonstrate the efficiency of our fusion approach,with significant improvements over some conventional methods.

关键词： Hyperspectral fusion morphology plant biology

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A new technique for separation of partial discharge sources and electromagnetic noise in radiofrequency measurements using energy ratios of different antennas

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High Voltage 2021年第3期6卷 525-530页

作者： Jorge A.Ardila‐Rey Matias Cerda‐Luna Rodrigo Rozas‐Valderrama Bruno Albuquerque de Castro AndréLuiz Andreoli Benjamin Cevallos Departamento de Ingeniería Eléctrica Universidad Técnica Federico Santa MaríaSantiago de ChileChile Department of Electrical Engineering São Paulo State University(UNESP)School of Engineering BauruBauru‐SPBrazil

One of the main tools for monitoring the condition of high voltage equipment is the measurement of partial discharges(PD).The electromagnetic(EM)radiation originated from this degradation phenomenon can be captured by various types of ultra‐high fre-quency(UHF)antennas carefully designed and optimised for specific frequency ***,the presence of environmental noise may limit the use of this *** types of monopole antennas normally used in UHF PD measurement have been evaluated in order to validate the performance of a novel separation technique of EM ***,a new separation technique based on the energy ratio of the captured signals was developed,considering noise *** results revealed that the new technique allows an adequate separation,even when three sources act simultaneously.

关键词： antennas separation noise

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The sprayed ZnO films: nanostructures and physical parameters

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Journal of Semiconductors 2015年第8期36卷 30-36页

作者： M.Benhaliliba A.Tiburcio-Silver A.Avila-Garcia A.Tavira Y.S.Ocak M.S.Aida C.E.Benouis Material Technology Department Physics Faculty USTO-MB University ITT-DIE Cinvestav-IPN Department of Ingeniería Eléctrica-SEES Dicle University Education Faculty Science Department Thin Films & Plasma Lab Physics Department Mentouri University

We synthesized the pure and indium-doped （IZO） ZnO films with a facile composition control spray pyrolysis route. The substrate temperature （Ts） and In-doping effects on the properties of as-grown films are inves- tigated. The X-ray pattern confirms that the as-synthesized ZnO phase is grown along a （002） preferential plane. It is revealed that the crystalline structure is improved with a substrate temperature of 350 ℃ Moreover, the morphol- ogy of as-grown films, analyzed by AFM, shows nanostructures that have grown along the c-axis. The （3 ×3 μm2） area scanned AFM surface studies give the smooth film surface RMS 〈 40 nm. The UV-VIS-IR measurements reveal that the sprayed films are highly transparent in the visible and IR bands. The photoluminescence analysis shows that the strong blue and yellow luminescences of 2.11 and 2.81 eV are emitted from ZnO and IZO films with a slight shift in photon energy caused by In-doping. The band gap is a bit widened by In-doping, 3.21 eV （ZnO） and 3.31 eV （IZO） and the resistivity is reduced from 385 to 8Ω·m. An interesting result is the resistivity linear dependence on the substrate temperature of pure ZnO films.

关键词： sprayed ZnO films deposition temperature AFM observation photoluminescence emission resis- tivity

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Physical Interpretation of the Dirac Neutrino with Electromagnetic Mass

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Journal of Electromagnetic Analysis and Applications 2013年第7期5卷 294-301页

作者： Héctor Torres-Silva Escuela de Ingeniería Eléctrica Electrónica Universidad de Tarapacá Arica Chile

The usual choice of an orthogonal set of four plane-wave solutions of the free-particle Dirac equation does not lend itself readily to direct and complete physical interpretation in the case of Dirac neutrino particle. A different choice of solutions can be made which yields a direct physical interpretation at all energies. Besides the separation of positive and negative energy states there is a further separation of states for which the spin is respectively parallel or antiparallel to the direction of the momentum vector. This can be obtained from the Maxwell’s equation without charges and current in the configuration. Scenery of our study is at high temperature T where coexist electron-positron pair and neutrino-antineutrino pair, (i.e., T≥1 MeV). Taking into consideration the possibility of negative mass, we can describe the observed behavior of antimatter in response to electromagnetic fields by assuming that the anti Dirac neutrino has a negative mass, so a new causal symmetry can be obtained.

关键词： Chiral Neutrino Dirac Equation Maxwell System

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Negative Refraction in Chiral Plasma Media

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Journal of Electromagnetic Analysis and Applications 2013年第4期5卷 175-181页

作者： Héctor Torres-Silva Escuela de Ingeniería Eléctrica Electrónica Universidad de Tarapacá Arica Chile.

Negative refraction is currently achieved by driving the magnetic permeability and electrical permittivity simultaneously negative. It is studied an alternative route to negative refraction without manipulating these parameters ( εand μ) on a chiral magnetized plasma. By adding chirality to the plasma, we obtain windows where the refraction is negative. The size of these windows depends on parameters such as: chirality degree, external magnetic field and the angle of incidence of the electromagnetic wave. The present study demonstrates that the condition for negative phase-velocity propagation can be satisfied by non dissipative Faraday chiral medium such as a very dilute magnetized space plasma.

关键词： Plasma Negative Refraction Metamaterial Chiral Waves

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Together but not scrambled:A perspective on chaotic printing/bioprinting

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Aggregate 2024年第4期5卷 1-11页

作者： Grissel Trujillo-de Santiago Mario Moisés Alvarez Centro de Biotecnología-FEMSA Tecnologico de MonterreyMonterreyNuevo LeonMéxico Departamento de Ingeniería Mecatrónica y Eléctrica Escuela de Ingeniería y CienciasTecnologico de MonterreyMonterreyNuevo LeonMéxico

Structures in nature are often multi-material,and their structures have aﬁne bal-ance between segregation and aggregation(mixed,but not scrambled)that provides *** fabrication,a technology that exploits the ability of chaotic advection to create predictable and reproducible multilayered structures,excels at producing materials where this balance can be achieved andﬁnely *** method is based on the use of chaotic mixing systems,which can produce constructs with highly organized internal micro-architecture in a simple and cost-effective *** manuscript provides a perspective on how chaotic printing can be a great enabler in the manufacture of advanced materials,including living *** printing may overcome many of the critical hurdles that are currently faced in man-ufacturing and biofabrication(e.g.,creating a wide array of interfaces,reaching high resolutions rapidly and at low cost,and producing densely vascularized tissues).The manuscript introduces the technology,explains how the idea originated,presents a timeline that provides a recapitulation of the milestones achieved so far,describes the main characteristics,advantages,limitations,and challenges of the technology,and concludes with future perspectives on the evolution and use of this versatile method.

关键词： advanced materials bioprinting chaotic bioprinting chaotic printing multilayered multimaterial

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Output feedback adaptive super twisting sliding mode control for quadrotor UAVs

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Control Theory and Technology 2024年第1期22卷 92-105页

作者： Oscar Salas-Peña Jesus DeLeón-Morales Susana V.Gutiérrez-Martínez École Centrale de Nantes-LS2N UMR 6004 CNRS44300NantesFrance Facultad de Ingeniería Mecánica y Eléctrica Universidad Autónoma de Nuevo León66451San Nicolás de Los GarzaMexico

In this paper, a sliding mode control with adaptive gain combined with a high-order sliding mode observer to solve the tracking problem for a quadrotor UAV is addressed, in presence of bounded external disturbances and parametric uncertainties. The high order sliding mode observer is designed for estimating the linear and angular speed in order to implement the proposed scheme. Furthermore, a Lyapunov function is introduced to design the controller with the adaptation law, whereas an analysis of finite time convergence towards to zero is provided, where sufficient conditions are obtained. Regarding previous works from literature, one important advantage of proposed strategy is that the gains of control are parameterized in terms of only one adaptive parameter, which reduces the control effort by avoiding gain overestimation. Numerical simulations for tracking control of the quadrotor are given to show the performance of proposed adaptive control–observer scheme.

关键词： Adaptive super twisting controller High-order sliding modes observer UAV

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Integrated operational planning of hydrothermal power and natural gas systems with large scale storages

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Journal of Modern Power Systems and Clean Energy 2017年第3期5卷 299-313页

作者： Diego Mauricio OJEDA-ESTEYBAR Ricardo German RUBIO-BARROS Alberto VARGAS Instituto de Energı´a Ele´ctrica(IEE) Universidad Nacional de San Juan(UNSJ)Consejo Nacional de Investigaciones Cientı´ficas y Tecnolo´gicas(CONICET)Av.Libertador Gral.San Martı´n West 11095400 San JuanArgentina

The growing installation of natural gas fired power plants has increased the integration of natural gas and electricity sectors. This has driven the need investigate the interactions among them and to optimize energy resources management from a centralized planning perspective. Thus, a combined modeling of the reservoirs involved in electric power and gas systems and their locations on both networks are essential features to be considered in the operational planning of energy *** paper presents a modeling and optimization approach to the operational planning of electric power and natural gas systems, taking into account different energy storage facilities, such as water reservoirs, natural gas storages and line packs of pipelines. The proposed model takes advantage of captures both energy systems synergy and their associated networks. This approach identifies the interactions between the energy storage facilities and their economic impact over their optimal scheduling. The results show the benefits of an integrated operational planning of electric power and natural gas systems, the close interdependency between the energy resources stored in both systems, and the effects of a combined scheduling.

关键词： Energy storage Hydrothermal scheduling Integrated operational planning Integrated energy systems Natural gas

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