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Evaluation of phase formation and physical-mechanical properties of Portland cements produced with civil construction waste

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CEMENT 2021年 5卷

作者： F.N. Costa D.V. Ribeiro Post-Graduate Program in Civil Engineering (PPEC)/Federal University of Bahia Rua Aristides Novis 02. Federação Salvador BA 40210-630 Brazil Department of Materials Science and Technology Federal University of Bahia Rua Aristides Novis 02. Federação Salvador BA 40210-630 Brazil

Cement is the most widely used building material worldwide. Its production demands a large amount of natural resources, in addition to high energy consumption. Thus, the cement industry has been looking for solutions that effectively reduce the use of these resources as well as greenhouse gas emissions. This research aims to show the technical feasibility of incorporating civil construction waste (CCW) in the production of Portland cement. To this purpose, the physicochemical characterization of the raw materials used was carried out, dosage and manufacture of the raw mix, which were calcined at 1450 °C. Clinkers were characterized mineralogically, by means of XRD, to verify the formation of the crystalline phases. Subsequently, the clinkers were ground, resulting in Portland cements, and their physical-mechanical properties were evaluated. The results showed the potential of using CCW as an alternative raw material, since experimental cements presented performance similar to industrial cements used as a reference.

关键词： Civil construction waste (CCW Reuse Environment Cement Compressive strength

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Cladophialophora bantiana metabolites are efficient in the larvicidal and ovicidal control of Aedes aegypti, and Culex quinquefasciatus and have low toxicity in zebrafish embryo

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The Science of the total environment 2022年 852卷 158502页

作者： Chinnasamy Ragavendran Govindasamy Balasubramani Cherian Tijo Venkatesan Manigandan Eliningaya J Kweka Pandi Karthika Palaniappan Sivasankar Adelina Thomas Devarajan Natarajan Ismini Nakouti Guilherme Malafaia Natural Drug Research Laboratory Department of Biotechnology School of Biosciences Periyar University Salem 636 011 Tamil Nadu India Department of Cariology Saveetha Dental College and Hospitals Saveetha Institute of Medical and Technical Sciences (SIMATS) Chennai 600 077 India. Electronic address: ragavan889@***. Department of Research and Innovation Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences (SIMATS) Chennai 602105 Tamil Nadu India. Department of Ocean Studies and Marine Biology Pondicherry University Port Blair Campus Brookshabad Port Blair Andamans 744112 India. University of Texas Health Science Center San Antonio TX USA. Division of Livestock and Human Diseases Vector Control Tropical Pesticides Research Institute P.O. Box 3024 Arusha Tanzania Department of Medical Parasitology and Entomology Catholic University of Health and Allied Sciences P.O. Box 1464 Mwanza Tanzania. Natural Drug Research Laboratory Department of Biotechnology School of Biosciences Periyar University Salem 636 011 Tamil Nadu India. Water Supply and Bioeconomy Division Faculty of Environmental Engineering and Energy Poznan University of Technology Berdychowo 4 60-965 Poznan Poland. School of Pharmacy Catholic University of Health and Allied Sciences P.O. Box 1464 Mwanza Tanzania. Centre for Natural Products Discovery (CNPD) School of Pharmacy and Biomolecular Sciences Liverpool John Moores University Liverpool L3 3AF UK. Laboratory of Toxicology Applied to the Environment Goiano Federal Institute Urutaí GO Brazil Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute Urutaí GO Brazil Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia Uberlândia MG Brazil Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goiás Goiânia GO Brazil. Electronic address: guilhermeifgoiano@gmail.com.

Mosquitoes' current insecticide resistance status in available public health insecticides is a serious threat to mosquito control initiatives. Microbe-based control agents provide an alternative to conventional pesticides and insecticides, as they can be more targeted than synthetic insecticides. The present study was focused on identifying and investigating the mosquitocidal potential of Cladophialophora bantiana, an endophytic fungus isolated from Opuntia ficus-indica. The Cladophialophora species was identified through phylogenetic analysis of the rDNA sequence. The isolated fungus was first evaluated for its potential to produce metabolites against Aedes aegpti and Culex quinquefasciatus larvae in the 1-4th instar. The secondary metabolites of mycelium extract were assessed at various test doses (100, 200, 300, 400, and 500 μg/mL) in independent bioassays for each instar of selected mosquito larvae. After 48 h of exposure, A. aegypti expressed LC values of 13.069, 18.085, 9.554, and 11.717 μg/mL and LC = 25.702, 30.860, 17.275, and 19.601 μg/mL; followed by C. quinquefasciatus LC = 14.467, 11.766, 5.934, and 7.589 μg/mL, and LC = 29.529, 20.767, 11.192, and 13.296 μg/mL. The mean % of ovicidal bioassay was recorded 120 h after exposure. The hatchability (%) was proportional to mycelia metabolite concentration. The enzymatic level of acetylcholinesterase in fungal mycelial metabolite treated 4th instar larvae indicated a dose-dependent pattern. The GC-MS profile of C. bantiana extracts identified five of the most abundant compounds, namely cyclobutane, trans-3-undecene-1,5-diyne, 1-bromo-2-chloro, propane, 1,2,3-trichloro-2-methyl-, 5,5,10,10-tetrachlorotricyclo, and phenol, which had the killing effect in mosquitoes. Furthermore, the C. bantiana fungus ethyl acetate extracts had a strong larvicidal action on A. aegypti and C. quinquefasciatus. Finally, the toxicity test on zebrafish embryos revealed the induction of malformations only at concentrations above 1 m

关键词： Biopesticide Ecotoxicity Endophytic fungal Mosquitoes Vector control

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Retraction notice to "Pyrolysis: An effective technique for degradation of COVID-19 medical wastes" [Chemosphere 275 (2021) 130092]

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Chemosphere 2025年 370卷 143824页

作者： Selvakumar Dharmaraj Veeramuthu Ashokkumar Rajesh Pandiyan Heli Siti Halimatul Munawaroh Kit Wayne Chew Wei-Hsin Chen Chawalit Ngamcharussrivichai (Deemed to be University) Chennai 603112 Tamil Nadu India. Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals (CBRC) Faculty of Science Chulalongkorn University Bangkok 10330 Thailand. Department of Biochemistry Karpagam Academy of Higher Education (formerly Karpagam University) Pollachi Main Road Eachanari Post Coimbatore Tamil Nadu India. Chemistry Study Program Department of Chemistry Education Faculty of Mathematics and Science Education Universitas Pendidikan Indonesia Jl. Dr. Setiabudhi 229 Bandung 40154 Indonesia. School of Energy and Chemical Engineering Xiamen University Malaysia Jalan Sunsuria Bandar Sunsuria 43900 Sepang Selangor Malaysia College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 Fujian China. Department of Aeronautics and Astronautics National Cheng Kung University Tainan 701 Taiwan Research Center for Smart Sustainable Circular Economy Tunghai University Taichung 407 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology Taichung 411 Taiwan. Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals (CBRC) Faculty of Science Chulalongkorn University Bangkok 10330 Thailand Center of Excellence on Petrochemical and Materials Technology (PETROMAT) Chulalongkorn University Pathumwan Bangkok 10330 Thailand.

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Design and analysis of a bidirectional battery charger 8

Design and analysis of a bidirectional battery charger

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8th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2017

作者： Carvalho, Edivan Laercio Carati, Emerson Giovani Da Costa, Jean Patric De Oliveira Stein, Carlos Marcelo Cardoso, Rafael Federal University of Technology-Paraná-UTFPR Post-Graduation Program in Electrical Engineering-PPGEE Static Power Converters Engineering Research Group-ECEE Pato Branco-PR Brazil

ISBN: (纸本)9781509053384

This work proposes the design and analysis of a bidirectional and isolated battery charger for applications that involve energy storage like UPS or hybrid generation systems. Bidirectional characteristic is fundamental to allow the charge and discharge of batteries in a single equipment, reducing the number of systems and volume in applications that involve energy storage. In addition, the proposed converter provides low voltage and current ripple that are important to reduce electromagnetic interference and to improve the battery life cycle, as well as reducing semiconductors requirements. © 2017 IEEE.

关键词： Charging (batteries)

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Fabrication and characterization of nano-zirconia produced by aqueous-based tape casting

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materials Today: Proceedings 2017年第11期4卷 11506-11511页

作者： Micheline dos Reis Araújo Wilson Acchar Post-Graduation Program of Science and Materials Engineering Federal University of Rio Grande do Norte (UFRN) Natal Brazil

In this work, aqueous-based tape casting was used to produce nano-zirconia substrates. Rheological properties of the slurries were measured at room temperature. The acrylic-based suspensions showed a pseudoplastic behavior and remained stable and homogeneous. Warm pressing was used to laminate two or more cast tapes, in order to produce SOFC structures. Strength behavior of the sintered and laminates tapes was also evaluated.

关键词： Nano-zirconia Tape casting Rheogical properties

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Synthesis of cobalt ferrite (CoFe2O4) by combustion with different concentrations of glycine

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IOP Conference Series: materials Science and engineering 2019年第1期659卷

作者： C G Kaufmann Junior R Y S Zampiva A K Alves C P Bergmann L Giorgini Post-Graduation Program in Mining Metallurgy and Materials Engineering (PPGE3M) Federal University of Rio Grande do Sul Osvaldo Aranha 99 90035-190 Porto Alegre Brazil Post-Graduation Program in Production and Transport Engineering (PPGEP) Federal University of Rio Grande do Sul Osvaldo Aranha 99 90035-190 Porto Alegre Brazil Department of Industrial Chemistry 'Toso Montanari' University of Bologna Viale del Risorgimento 4 40136 Bologna Italy

Among the wide range of applications of Cobalt Ferrite (CoFe2O4), its usage for the manufacturing of modern electronic devices such as solar panels, capacitors and batteries has been studied' lately. Hence, solar-powered vehicles, which strongly rely their performance on energy efficient electronics, is a sector that could particularly benefit from enhanced applications of such material. In this work, the synthesis of Cobalt Ferrite was studied by means of Solution Combustion Synthesis (SCS) using iron nitrate nonahydrate and cobalt nitrate hexahydrate as precursors, and glycine as fuel. The nitrates were dissolved in distilled water and placed under stirring and heating for 5 minutes; when the temperature reached 60°C, glycine was added; after complete homogenization, the solution was placed in an electric oven (400°C) until complete combustion (approximately 15 minutes). Three syntheses were carried out using different concentrations of fuel: lean, stoichiometric and rich. The product crystallite size and composition were investigated in order to determine the influence of the fuel concentration on the structure of the produced cobalt ferrite.

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Sequential deposition method of TiO2/CH3NH3PbI3 films for solar cell application

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IOP Conference Series: materials Science and engineering 2019年第1期659卷

作者： A E R T P Oliveira F Bonatto A K Alves C Fragassa Post-Graduation Program in Mining Metallurgy and Materials Engineering (PPGE3M) Federal University of Rio Grande do Sul Osvaldo Aranha 99 90035-190 Porto Alegre Brazil InterDepartmental Centre for Industrial Research on Advanced Applications in Mechanical Engineering & Materials Technology Alma Mater Studiorum University of Bologna viale Risorgimento 2 40136 Bologna Italy

Seeking to study innovative solar cell compositions with the goal to reach the highest energy efficiency level attainable, the aim of this study was to develop a route to obtain a solar cell composed by hybrid perovskite (CH3NH3PbI3) using a sequential deposition method through the techniques of spin-coating and immersion. Initially, the deposition of PbI2 thin film of was performed on a FTO/glass substrate coated with TiO2, which was subsequently converted into perovskite crystals through spin coating using a CH3NH3I solution. The influence of the PbI2 layer thickness on the formation of CH3NH3PbI3 crystals was evaluated. The hydrophilic characteristic of TiO2 affects the distribution of the crystals nucleation sites, since PbI2 possesses a non-polar liquid characteristic. The characterization of the perovskite thin films showed that thickness affects directly the bandgap and the surface morphology, revealing the presence of dendritic structures and acicular crystals. Both growth and coverage increased for thinner layers of PbI2. It was also possible to observe an increased uniformity in the film for smaller PbI2 layers.

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Experimental analysis of jet slurry erosion on martensitic stainless steel

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IOP Conference Series: materials Science and engineering 2019年第1期659卷

作者： G Santacruz AS Takimi F Vannucchide Camargo CP Bergmann Post-Graduation Program in Mining Metallurgical and Materials Engineering Federal University of Rio Grande do Sul - UFRGS Osvaldo Aranha 99 Porto Alegre RS 90035-190 Brazil Department of Industrial Engineering University of Bologna Viale del Risorgimento 2 40136 Bologna Italy

Due to their enhanced tribological properties that contribute to an increased useful life of components, martensitic stainless steels are an excellent option for industrial applications such as hydroelectric, petrochemical, civil construction and mineral processing plants. In the present investigation, the erosive wear of AISI 410 martensitic stainless steel is evaluated after thermal treatment by quenching and tempering by mass loss, under erosive attack at 30° and 90° incidence angles, using a self-made jet slurry erosion equipment controlling parameters such as speed, volume of fluid, temperature and concentration of erosive particles of erodent. The characterization of the eroded samples was carried out in terms of the microstructure (SEM) and microhardness as well as the particle size distribution (LG) and morphology of the erodent. It was possible to establish the relationship between the slurry erosive wear and the physical properties inherent of stainless steel for this particular experimental configuration, concluding that the steel presents better resistance to jet slurry erosion wear when compared to austenitic steel commonly used in the industry.

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Surface treatment of Kevlar® polyaramid fibers with imidazolium-based ionic liquids 11

Surface treatment of Kevlar® polyaramid fibers with imidazo...

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11th Annual TechConnect World Innovation Conference and Expo, Held Jointly with the 20th Annual Nanotech Conference and Expo, and the 2017 National SBIR/STTR Conference

作者： Moraes, C. Schrekker, H.S. Amico, S.C. Post-Graduation Program in Mining Metallurgical and Materials Engineering Federal University of Rio Grande do Sul Porto Alegre Brazil Laboratory of Technological Processes and Catalysis Institute of Chemistry Federal University of Rio Grande do Sul Porto Alegre Brazil

ISBN: (纸本)9780997511789

Polyaramid fibers have excellent mechanical properties, such as high tensile strength-to-weight ratio and high thermal stability, but its applicability as reinforcement for composite materials is limited due to its high crystallinity and inert and smooth surface. In this work, an imidazolium-based ionic liquid (l-Butyl-3-methylimidazolium chloride) was used to treat Kevlar polyaramid fibers with the aim of improving Kevlar and epoxy resin interaction. The fibers were characterized by infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM). Tensile strength tests were carried out to verify loss of mechanical properties caused by the treatment. Contact angle measurements and pull-out tests verified an improvement of the wettability and adhesion between the fibers and epoxy resin. The interfacial shear strength (IFSS) was improved by 37% and the contact angle was decreased from 35° to 22.

关键词： Epoxy resins

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Solution combustion synthesis of Mo-Fe/MgO: Influence of the fuel composition on the production of doped catalyst nanopowder

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IOP Conference Series: materials Science and engineering 2019年第1期659卷

作者： R Y S Zampiva C P Bergmann A K Alves L Giorgini Post-Graduation Program in Mining Metallurgy and Materials Engineering (PPGE3M) Federal University of Rio Grande do Sul Osvaldo Aranha 99 90035-190 Porto Alegre Brazil Department of Industrial Chemistry 'Toso Montanari' University of Bologna Viale del Risorgimento 4 40136 Bologna Italy

Among the techniques for producing oxide catalysts, the solution combustion synthesis (SCS) has been widely used to produce high-quality nanostructured powders at low-cost. Through SCS, due to the high exothermic energy liberated by the reaction between the transition metal nitrate and the fuel, it is possible to homogeneously incorporate dopant ions into the catalyst. Besides, SCS allows the production of nanopowders with sizes in the decimal scale, which is extremely important for powdered catalysts. The smaller the particle is, the larger the surface area is. Based on these possibilities, the aim of this work is to produce Fe-Mo/MgO nanopowders by SCS. The influence of concentration and composition of the fuels glycine and polyethylene glycol (PEG) on the final product were investigated. The morphology and the physicochemical properties were characterized by X-ray diffraction (XRD), electron microscopy (SEM), granulometry and surface area analysis. The results indicated high crystallinity for the samples produced with PEG and a wide variation on the nanoparticles sizes depending on the fuel properties.

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