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2022 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2022

作者： Brandao, Dener A. De L. Parreiras, Thiago M. Pires, Igor A. Filho, Braz De J. Cardoso Graduate Program in Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte Brazil Institute of Technological Sciences Universidade Federal de Itajuba Itabira Brazil Department of Electronics Engineering Universidade Federal de Minas Gerais Belo Horizonte Brazil Department of Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte Brazil

ISBN: (数字)9781665492065

ISBN: (纸本)9781665492065

As the electrical vehicle fleet grows, extreme fast charging (XFC) stations for multiple vehicles will be increasingly needed. The challenges for the implementation of many XFC stations in the electric power system are many and it is necessary to use converters that reduce the negative impacts on the electric grid, meet the standards and recommendations, and that are technically and economically viable. This work proposes an XFC station for multiple vehicles that has a very low current harmonics injection at the grid side, with a Total Demand Distortion (TDD) of 0.62% without using sinusoidal filter, provides galvanic isolation for each input/output port, and can provide additional features such as Distributed Energy Resources (DER) integration and ancillary services. This is achieved by combining a bidirectional low switching frequency grid-connected active front-end with high switching frequency SiC-based dc/dc converters in the vehicles side. After a brief description of the proposed system and its control, simulation results are presented to validate the XFC. © 2022 IEEE.

关键词： Rectifying circuits

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Chitosan-geopolymer composites: A synergistic approach to sustainable and functional materials

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Ceramics International 2025年

作者： Silva, Angelo Oliveira Colombo, Paolo Hotza, Dachamir Graduate Program in Chemical Engineering Federal University of Santa Catarina SC Florianópolis88040-900 Brazil Department of Industrial Engineering University of Padova Padova35131 Italy

The combination of chitosan, a natural biopolymer, with geopolymers, a class of inorganic materials, represents a promising strategy to develop sustainable and high-performance composites for various applications. This review explores the current state of research on chitosan-geopolymer composites, focusing on two primary methods of incorporation: pre-geopolymerization and post-geopolymerization. Key findings highlight how chitosan addition impacts the properties of geopolymers, with potential applications in civil construction materials and environmental remediation. The review also discusses the challenges of process optimization, scalability, and long-term performance, identifying future research directions to enhance the effectiveness of these materials. This work aims to provide a comprehensive overview for researchers and engineers interested in the development and application of innovative, eco-friendly materials. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Metamaterials

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Reachability Analysis of Nonlinear Discrete-Time Systems Using Polyhedral Relaxations and Constrained Zonotopes 63

Reachability Analysis of Nonlinear Discrete-Time Systems Usi...

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63rd IEEE Conference on Decision and Control, CDC 2024

作者： Rego, Brenner S. Raffo, Guilherme V. Terra, Marco H. Scott, Joseph K. Georgia Institute of Technology Department of Chemical and Biomolecular Engineering 311 Ferst Dr. AtlantaGA30318 United States University of Säo Paulo Department of Electrical and Computer Engineering SP Säo Carlos13566-590 Brazil Federal University of Minas Gerais Department of Electronics Engineering and the Graduate Program in Electrical Engineering MG Belo Horizonte31270-901 Brazil

ISBN: (纸本)9798350316339

This paper presents a novel algorithm for reachability analysis of nonlinear discrete-time systems. The proposed method combines constrained zonotopes (CZs) with polyhedral relaxations of factorable representations of nonlinear functions to propagate CZs through nonlinear functions, which is normally done using conservative linearization techniques. The new propagation method provides better approximations than those resulting from linearization procedures, leading to significant improvements in the computation of reachable sets in comparison to other CZ methods from the literature. Numerical examples highlight the advantages of the proposed algorithm. © 2024 IEEE.

关键词： Numerical methods

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Microencapsulation of bioactive compound extracts using maltodextrin and gum arabic by spray and freeze-drying techniques

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International Journal of Biological Macromolecules 2023年第Part4期253卷 126969页

作者： Laureanti, Emanuele Joana Gbur Paiva, Thainnane Silva de Matos Jorge, Luiz Mário Jorge, Regina Maria Matos Graduate Program in Chemical Engineering Department of Chemical Engineering Federal University of Paraná Coronel Francisco Heráclito dos Santos Avenue Curitiba81531-980 Brazil Graduate Program in Food Engineering Department of Chemical Engineering Federal University of Paraná Coronel Francisco Heráclito dos Santos Avenue Curitiba81531-980 Brazil Colombo Avenue 5790 CEP MaringáPR87020-900 Brazil

Microencapsulation techniques establish a protective barrier around a sensitive compound, reducing vulnerability to external influences and offering controlled release. This work evaluates microencapsulation of Brazilian seed known as pink pepper (Schinus terebinthifolius) extract incorporated with green propolis extract, (main propolis font from the South America native plant Baccharis dracunculifolia DC) to enhancement antioxidant activity through synergic interaction, comparing to the extracts individually. Four treatments were produced using maltodextrin and combined with gum arabic as encapsulating agent, employing two different microencapsulation technique applied (spray drying and freeze drying) to assess their impact on physicochemical properties. The incorporation of gum arabic into matrix yielded higher encapsulation efficiency values, exhibiting significant differences for both encapsulation techniques. Combining the two encapsulation agents afforded greater protection of the bioactive compounds, resulting in an increase of approximately 31 % in the inhibition of the DPPH● radical. In controlled release analysis, maltodextrin exhibits the best protective effect on total phenolic compounds during intestinal release, whereas combining maltodextrin and gum arabic enhanced protection during gastric phase. Microcapsules may contribute to the protection of important bioactive compound, possessing a wide range of applications such as flavors encapsulation in food industry, lipids, antioxidants and pharmaceutical industry for controlled drug release. © 2023 Elsevier B.V.

关键词： Microencapsulation

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Electric Arc Furnace Reactive Compensation System Using Zero Harmonic Distortion Converter

Electric Arc Furnace Reactive Compensation System Using Zero...

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作者： de Brandao, Dener A.L. Parreiras, Thiago M. Pires, Igor A. de Cardoso, Braz J.F. Federal University of Minas Gerais Graduate Program in Electrical Engineering Belo Horizonte30575-180 Brazil Federal University of Itajubá Institute of Technological Sciences Itabira37500-903 Brazil Federal University of Minas Gerais Department of Electronic Engineering Belo Horizonte30575-180 Brazil Federal University of Minas Gerais Department of Electrical Engineering Belo Horizonte30575-180 Brazil

Steel production worldwide continues to grow and, consequently, also the energy consumption of the steel sector. With the applications of the electric arc furnace route in the steelmaking process, the concern with aspects of power quality and overload of the transmission grid lines increases. This work presents the zero harmonic distortion (ZHD) converter static synchronous compensator (STATCOM), which makes it possible to increase the displacement power factor of an electric arc furnace (EAF) application from 0.88 to 0.98 with total demand distortion in the grid around 1.44% with the ZHD prototype operation, this being accomplished without using high-order sinusoidal filters and with consolidated components in the industry. © 1972-2012 IEEE.

关键词： Electric furnaces

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Exploring Carotenoid from Chlorella Sorokiniana as a Natural Alternative to Yellow Artificial Food Dyes: Stability and Application in Model System

SSRN

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SSRN 2025年

作者： Bianchini, Carlen Bettim Minatel, Gabriela Gomes Schappo, Flávia Barbosa Arend, Giordana Demaman de Mello Castanho Amboni, Renata Dias De Rosso, Veridiana Vera Nunes, Itaciara Larroza Graduate Program in Food Science Department of Food Science and Technology Federal University of Santa Catarina Florianópolis88034-001 Brazil Graduate Program in Food Engineering Department of Chemical Engineering and Food Engineering Federal University of Santa Catarina Florianópolis88040-900 Brazil Nutrition and Food Service Research Center Federal University of São Paulo Santos11015-020 Brazil

This study investigated ultrasound-assisted extraction using ethanol from Chlorella sorokiniana-derived carotenoids and encapsulation by co-crystallization. The carotenoid extract was quantified and identified (HPLC-DAD) and its encapsulation efficiency was assessed. Co-crystals were analyzed for FTIR spectra, morphology (SEM) and stability (moisture, water activity, carotenoid content, and color) over 90 days. Their potential as a natural dye in gelatin was also evaluated. Lutein and β-carotene were the major carotenoids, with an encapsulation efficiency of 53%. FTIR analysis of the co-crystals demonstrated characteristic functional groups of sucrose and carotenoids, while SEM revealed a porous structure with particles diameters ranging from 2 μm to 20 μm. Over storage, moisture, and water activity increased, while carotenoid content decreased. Yellow remained stable in co-crystals for 90 days, whereas gelatin powder showed reduced red and yellow colors. The color of the ready-to-serve gelatin remained stable for seven days. Co-crystals can replace artificial dyes and sugar in gelatin. © 2025, The Authors. All rights reserved.

关键词： Ethanol

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Enhancement of effluent degradation by zinc oxide, carbon nitride, and carbon xerogel trifecta on brass monoliths

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Environmental Science and Pollution Research 2024年第40期31卷 53472-53496页

作者： da Silva, Émerson Felipe Mendonça Garcia, Ramón Raudel Peña Rodrigues, Liana Alvares Napoleão, Daniella Carla Sanz, Oihane Almeida, Luciano Costa Department of Chemical Engineering Technology and Geoscience Center Federal University of Pernambuco PE Recife50740-521 Brazil Pós Graduate Program in Materials Science and Engineering Federal University of Piauí PI Teresina64049-550 Brazil Academic Unit of Cabo de Santo Agostinho Federal Rural University of Pernambuco PE Cabo de Santo Agostinho54518-430 Brazil Dept. of Applied Chemistry Chemistry Faculty University of the Basque Country UPV/EHU P. Lardizabala 3 San Sebastian20018 Spain Escola de Engenharia de Lorena EEL/USP Estrada Municipal Do Campinho S/N São Paulo LorenaCEP 12602-810 Brazil

In recent years, heterogeneous photocatalysis has emerged as a promising alternative for the treatment of organic pollutants. This technique offers several advantages, such as low cost and ease of operation. However, finding a semiconductor material that is both operationally viable and highly active under solar irradiation remains a challenge, often requiring materials of nanometric size. Furthermore, in many processes, photocatalysts are suspended in the solution, requiring additional steps to remove them. This can render the technique economically unviable, especially for nanosized catalysts. This work demonstrated the feasibility of using a structured photocatalyst (ZnO, g-C3N4, and carbon xerogel) optimized for this photodegradation process. The synthesized materials were characterized by nitrogen adsorption and desorption, X-ray diffraction (XRD), and diffuse reflectance spectroscopy (DRS). Adhesion testing demonstrated the efficiency of the deposition technique, with film adhesion exceeding 90%. The photocatalytic evaluation was performed using a mixture of three textile dyes in a recycle photoreactor, varying pH (4.7 and 10), recycle flow rate (2, 4, and 6 L h−1), immobilized mass (1, 2, and 3 mg cm−2), monolith height (1.5, 3.0, and 4.5 cm), and type of radiation (solar and visible artificials;and natural solar). The structured photocatalyst degraded over 99% of the dye mixture under artificial radiation. The solar energy results are highly promising, achieving a degradation efficiency of approximately 74%. Furthermore, it was possible to regenerate the structured photocatalyst up to seven consecutive times using exclusively natural solar light and maintain a degradation rate of around 70%. These results reinforce the feasibility and potential application of this system in photocatalytic reactions, highlighting its effectiveness and sustainability. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Heterojunctions

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Bovine bone–based activated carbon composite containing nanomagnetite as a catalyst for photo-Fenton reactions

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Environmental Science and Pollution Research 2025年 1-18页

作者： Guidolin, Thays de Oliveira Polla, Mariana Borges Rodriguez, Adriane de Assis Lawisch Wermuth, Tiago Bender Eller, Sarah de Oliveira, Tiago Franco Pereira, Fabiano Raupp da Cas Viegas, Alexandre Montedo, Oscar Rubem Klegues Cechinel, Maria Alice Prado Arcaro, Sabrina Universidade Do Extremo Sul Catarinense SC CriciúmaCEP 88806-000 Brazil Laboratório de Engenharia Ambiental Universidade de Santa Cruz Do Sul RS Santa Cruz Do SulCEP 96815-900 Brazil Graduate Program in Health Sciences Federal University of Health Sciences of Porto Alegre RS Porto AlegreCED 90050-170 Brazil Institute of Physics Federal University of Rio Grande Do Sul 9500 RS Porto AlegreCEP 91501-970 Brazil Department of Chemical and Food Engineering Federal University of Santa Catarina SC FlorianópolisCEP 88040-900 Brazil

Magnetic composites (MC) prepared from magnetite nanoparticles (MNP) and activated carbon from bovine bone (AC) in different proportions (75/25, 50/50, and 25/75) were used as catalysts in the photo-Fenton process to degrade methylene blue (MB) in aqueous solution. The materials were prepared by the citrate–nitrate sol–gel synthesis method and used as catalysts in the photo-Fenton process. The photocatalytic tests were performed in a cylindrical reactor with a 4.13-cm internal diameter and 300-mL maximum capacity, equipped with 9.9-W visible light lamps. The specific surface area of the MC increased by up to 1138.39% with the addition of AC. Morphological analysis confirmed the anchoring of MNPs on the AC surface. The band gap values of the materials ranged from 1.16 to 1.55 eV and increased proportionally with the addition of AC to the MC compositions. MC-75/25 and MC-50/50 presented predominantly superparamagnetic behavior, while for MC-25/75 superparamagnetic and superimposed paramagnetic phases were observed. All samples showed good reduction of the MB concentration, exceeding 80% after 10 cycles of use. The mineralization advanced extensively to simple organic acids, proving the non-generation of harmful by-products and the efficiency of this photocatalytic system. The use of magnetic composites favored the efficient separation of the catalyst without causing secondary pollution, in addition to increasing the stability and reusability of the catalysts. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Bone

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Field Weakening Strategies to Suppress Intermediate DC-DC Conversion Stages in Hybrid Construction Machinery

Field Weakening Strategies to Suppress Intermediate DC-DC Co...

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2022 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2022

作者： Parreiras, Thiago M. Brandao, Dener A. L. Maia, Thales A.C. Pires, Igor A. Nascimento, Anderson Cardoso, Braz J. Institute of Technological Sciences Universidade Federal de Itajubá Itabira Brazil Graduate Program in Electrical Engineering Universidade Federal de Minas Gerais Belo Horizonte Brazil Universidade Federal de Minas Gerais Department of Electrical Engineering Belo Horizonte Brazil South America Tractor Backhoe Loaders CNH Industrial Brasil Contagem Brazil

ISBN: (数字)9781665492065

ISBN: (纸本)9781665492065

Hybrid Construction Machinery differs from conventional Hybrid and Full Electric Vehicles since the electrification can be applied not only to the traction system, but also and mainly to its attachments, which generally are the major responsible for diesel consumption. A dc-dc converter stage is usually applied between the battery bank and the motor drive in order to properly deal with the substantial battery voltage variation as a function of its state-of-charge (SoC). This work presents how a field weakening strategy can be applied to a Permanent Magnet Synchronous Machine (PMSM) drive in order to allow direct connection of the batteries to its dc link, therefore suppressing the need of a dc-dc stage and, consequently, reducing the hybridization costs, weight and volume. Simulation results are presented in a ditch excavation cycle. © 2022 IEEE.

关键词： Construction equipment

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Security of Cyber-Physical Systems Against Actuator Attacks through Cryptography*

Security of Cyber-Physical Systems Against Actuator Attacks ...

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International Conference on Information Technology (ICIT)

作者： Samuel Oliveira André B. Leal Marcelo Teixeira Yuri K. Lopes Department of Exact and Technological Sciences Federal University of Amapá (UNIFAP) Macapá/AP Brazil Graduate Program in Electrical Engineering Santa Catarina State University (UDESC) Joinville/SC Brazil Graduate Program in Electrical Engineering Federal University of Technology (UTFPR) Pato Branco/PR Brazil

The connectivity demanded by Industry 4.0 poses new challenges for cyber-physical systems (CPS), notably bolstering resilience against cyberattacks. In this paper, the authors use the formalism of Discrete Event Systems (DES) to design an approach that aims to protect CPS against actuator attacks using event-based symmetric cryptography. In this approach, controllable events that are properly selected are encrypted before being transmitted from the controller to the plant, leading intruders to mistakenly infer the supervisor's control actions. Thus, attacks on actuators do not have the expected impact on the plant, preventing unsafe states from being reached. The proposed approach is applied to a case study from the literature, where the identification of the attack is done without causing any damage while maintaining the integrity of the system.

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