Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16306
SeyedMehdi Mohammadizadeh, José Gilberto Dalfré Filho, Cassiano Sampaio Descovi, Luis Fernando Murillo Bermúdez, Daniel Alfonso Sierra, Gerarld Corzo Pérez
This study is dedicated to the examination of cavitation-induced erosion, a critical factor in optimizing the efficiency of hydraulic systems, including hydropower plants and pumping systems. To accomplish this, we conducted a sensitivity analysis utilizing a cavitation jet apparatus (CJA) and an experimental configuration that featured a vertical cylindrical test tank, a submerged nozzle, and an aluminum sample (specifically, alloy 6351 T6). The study maintained a consistent standoff distance of 5 cm and an orifice diameter of 2 × 10-3 m. Two distinct nozzle geometries were tested to assess their influence on cavitation erosion. The outcomes revealed that the 20° conical sharped-edges nozzle resulted in the highest erosion rates, while the commercial nozzle (MEG 2510) caused comparatively less erosion. By standardizing the test duration to 1200 seconds and using a cavitation index of 0.14, the researchers avoided overlapping pits. In summary, the CJA, with these adjustments, demonstrated its effectiveness as a tool for evaluating the resistance of solid surfaces to cavitation.
{"title":"AVALIAÇÃO DA EROSÃO POR CAVITAÇÃO EM SUPERFÍCIES SÓLIDAS USANDO UM APARATO DE JATO DE CAVITAÇÃO","authors":"SeyedMehdi Mohammadizadeh, José Gilberto Dalfré Filho, Cassiano Sampaio Descovi, Luis Fernando Murillo Bermúdez, Daniel Alfonso Sierra, Gerarld Corzo Pérez","doi":"10.15628/holos.2023.16306","DOIUrl":"https://doi.org/10.15628/holos.2023.16306","url":null,"abstract":"This study is dedicated to the examination of cavitation-induced erosion, a critical factor in optimizing the efficiency of hydraulic systems, including hydropower plants and pumping systems. To accomplish this, we conducted a sensitivity analysis utilizing a cavitation jet apparatus (CJA) and an experimental configuration that featured a vertical cylindrical test tank, a submerged nozzle, and an aluminum sample (specifically, alloy 6351 T6). The study maintained a consistent standoff distance of 5 cm and an orifice diameter of 2 × 10-3 m. Two distinct nozzle geometries were tested to assess their influence on cavitation erosion. The outcomes revealed that the 20° conical sharped-edges nozzle resulted in the highest erosion rates, while the commercial nozzle (MEG 2510) caused comparatively less erosion. By standardizing the test duration to 1200 seconds and using a cavitation index of 0.14, the researchers avoided overlapping pits. In summary, the CJA, with these adjustments, demonstrated its effectiveness as a tool for evaluating the resistance of solid surfaces to cavitation.","PeriodicalId":13167,"journal":{"name":"Holos","volume":" 32","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138963338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16367
Giovana Rocha De Oliveira, Larissa Botelho D’Alevedo, Suzan da Silva Lessa, M. M. M. Caetano, D. Goveia, Paulo Sergio Tonello
In this work, low molecular weight chitosan was used to adsorb the herbicide glyphosate in aqueous solution. Considering the possibilities of remediation and monitoring in aquatic environments, chitosan was formatted into thin discs 0.8 mm thick and 2.5 cm in diameter. The films were characterized by SEM, EDS and FTIR. In the adsorption study, a chitosan disc was able to adsorb 100% of a 5 mgL-1 glyphosate solution. Pseudo-first-order, pseudo-second-order and Elovich kinetic models were applied and it was found that chemisorption predominates in the adsorption process. Thus, chitosan films can act very well as a material for remediating water bodies contaminated by glyphosate. For monitoring studies, the possibility of using chitosan films in DGT (Diffusive Gradients in Thin Films) technique was verified and the diffusive material used was 1.5% agarose film (m/v). The diffusion coefficient of glyphosate in the agarose gel was determined 7.94 x 10-10 m2s-1.
{"title":"BIOPOLÍMERO QUITOSANA NA ADSORÇÃO DE GLIFOSATO: USO NO MONITORAMENTO OU REMEDIAÇÃO AMBIENTAL","authors":"Giovana Rocha De Oliveira, Larissa Botelho D’Alevedo, Suzan da Silva Lessa, M. M. M. Caetano, D. Goveia, Paulo Sergio Tonello","doi":"10.15628/holos.2023.16367","DOIUrl":"https://doi.org/10.15628/holos.2023.16367","url":null,"abstract":"In this work, low molecular weight chitosan was used to adsorb the herbicide glyphosate in aqueous solution. Considering the possibilities of remediation and monitoring in aquatic environments, chitosan was formatted into thin discs 0.8 mm thick and 2.5 cm in diameter. The films were characterized by SEM, EDS and FTIR. In the adsorption study, a chitosan disc was able to adsorb 100% of a 5 mgL-1 glyphosate solution. Pseudo-first-order, pseudo-second-order and Elovich kinetic models were applied and it was found that chemisorption predominates in the adsorption process. Thus, chitosan films can act very well as a material for remediating water bodies contaminated by glyphosate. For monitoring studies, the possibility of using chitosan films in DGT (Diffusive Gradients in Thin Films) technique was verified and the diffusive material used was 1.5% agarose film (m/v). The diffusion coefficient of glyphosate in the agarose gel was determined 7.94 x 10-10 m2s-1.","PeriodicalId":13167,"journal":{"name":"Holos","volume":"368 ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16315
Cassiano Sampaio Descovi, Antonio Carlos Zuffo, SeyedMehdi Mohammadizadeh, Luis Fernando Murillo Bermúdez, Daniel Alfonso Sierra
This article demonstrates the successful application of Long Short-Term Memory (LSTM) recurrent neural networks to simulate streamflow in the Aquidauana River basin, located in the Brazilian Pantanal. The LSTM network used daily precipitation data as input to predict future streamflow in the region. The results obtained from this research show a coefficient of determination (R2) of 0.82, indicating a strong fit of the model to the observed data. Additionally, the Root Mean Squared Error (RMSE) was found to be 0.53, indicating the model's accuracy in predicting streamflow compared to actual data. These findings highlight the effectiveness of LSTM networks in hydrological modeling for the Pantanal region, which is crucial for water resource planning and sustainable management in this ecologically significant area. This study is expected to serve as a catalyst for further research and make a substantial contribution to the advancement of streamflow prediction techniques in complex watersheds such as the Aquidauana River basin.
{"title":"REDES DE MEMÓRIA DE LONGO E CURTO PRAZO (LSTM) PARA PREDIÇÃO DE FLUXO DE RIO NA BACIA DO PANTANAL BRASILEIRO","authors":"Cassiano Sampaio Descovi, Antonio Carlos Zuffo, SeyedMehdi Mohammadizadeh, Luis Fernando Murillo Bermúdez, Daniel Alfonso Sierra","doi":"10.15628/holos.2023.16315","DOIUrl":"https://doi.org/10.15628/holos.2023.16315","url":null,"abstract":"This article demonstrates the successful application of Long Short-Term Memory (LSTM) recurrent neural networks to simulate streamflow in the Aquidauana River basin, located in the Brazilian Pantanal. The LSTM network used daily precipitation data as input to predict future streamflow in the region. The results obtained from this research show a coefficient of determination (R2) of 0.82, indicating a strong fit of the model to the observed data. Additionally, the Root Mean Squared Error (RMSE) was found to be 0.53, indicating the model's accuracy in predicting streamflow compared to actual data. These findings highlight the effectiveness of LSTM networks in hydrological modeling for the Pantanal region, which is crucial for water resource planning and sustainable management in this ecologically significant area. This study is expected to serve as a catalyst for further research and make a substantial contribution to the advancement of streamflow prediction techniques in complex watersheds such as the Aquidauana River basin.","PeriodicalId":13167,"journal":{"name":"Holos","volume":" 16","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Um reator UASB em pequena escala foi modelado para avaliar seu comportamento hidrodinâmico e comparar simulações de CFD com resultados experimentais obtidos em escala de laboratório. Foram realizadas simulações usando o Ansys® CFXTM com duas taxas de fluxo diferentes: A) 26,68 e B) 4,0 l d-1. O volume do reator era de 1,5 litros, com um volume útil de 1,38 litros. Além das simulações de CFD, foram realizados testes hidrodinâmicos com injeção de traçador, tanto experimentalmente quanto nas simulações. Foram obtidas curvas de distribuição do tempo de residência (RTD) e o modelo de número de tanques em série (NTIS) foi usado para determinação do comportamento hidrodinâmico. Os valores de NTIS calculados usando simulações de CFD foram 5,55 e 4,76, para as taxas de fluxo A e B, respectivamente. Para a análise experimental, os valores de NTIS foram 6,67 e 5,54, para as taxas de fluxo A e B, respectivamente. O teste U de Mann-Whitney foi realizado para confirmar a similaridade entre as simulações de CFD e os testes experimentais. Os resultados do teste U de Mann-Whitney não mostraram diferenças estatisticamente significativas entre as simulações de CFD e os dados experimentais. Pode-se concluir que as simulações de CFD são válidas e podem ser usadas para analisar o comportamento hidrodinâmico dos reatores UASB.
对一个小型 UASB 反应器进行了建模，以评估其流体动力学特性，并将 CFD 模拟结果与实验室规模的实验结果进行比较。模拟使用 Ansys® CFXTM 进行，有两种不同的流速：A) 26.68 和 B) 4.0 l d-1。反应器容积为 1.5 升，有效容积为 1.38 升。除 CFD 模拟外，还进行了实验和模拟示踪剂注入的流体力学测试。获得了停留时间分布（RTD）曲线，并使用串联水槽数（NTIS）模型来确定流体力学行为。使用 CFD 模拟计算出的 NTIS 值分别为 5.55 和 4.76（流速 A 和 B）。在实验分析中，流速 A 和 B 的 NTIS 值分别为 6.67 和 5.54。为确认 CFD 模拟和实验测试之间的相似性，进行了曼-惠特尼 U 检验。Mann-Whitney U 检验的结果表明，CFD 模拟结果与实验数据之间没有显著的统计学差异。由此可以得出结论，CFD 模拟是有效的，可用于分析 UASB 反应器的流体动力学行为。
{"title":"ESTUDO HIDRODINÂMICO DE REATOR UASB DE PEQUENA ESCALA POR DINÂMICA DE FLUIDO COMPUTACIONAL (CFD): SIMULAÇÃO E VALIDAÇÃO","authors":"Vinícius Carvalho Rocha, Andreza Nataline Simões, Carla Eloísa Diniz dos Santos, Eduardo Cleto Pires","doi":"10.15628/holos.2023.16400","DOIUrl":"https://doi.org/10.15628/holos.2023.16400","url":null,"abstract":"Um reator UASB em pequena escala foi modelado para avaliar seu comportamento hidrodinâmico e comparar simulações de CFD com resultados experimentais obtidos em escala de laboratório. Foram realizadas simulações usando o Ansys® CFXTM com duas taxas de fluxo diferentes: A) 26,68 e B) 4,0 l d-1. O volume do reator era de 1,5 litros, com um volume útil de 1,38 litros. Além das simulações de CFD, foram realizados testes hidrodinâmicos com injeção de traçador, tanto experimentalmente quanto nas simulações. Foram obtidas curvas de distribuição do tempo de residência (RTD) e o modelo de número de tanques em série (NTIS) foi usado para determinação do comportamento hidrodinâmico. Os valores de NTIS calculados usando simulações de CFD foram 5,55 e 4,76, para as taxas de fluxo A e B, respectivamente. Para a análise experimental, os valores de NTIS foram 6,67 e 5,54, para as taxas de fluxo A e B, respectivamente. O teste U de Mann-Whitney foi realizado para confirmar a similaridade entre as simulações de CFD e os testes experimentais. Os resultados do teste U de Mann-Whitney não mostraram diferenças estatisticamente significativas entre as simulações de CFD e os dados experimentais. Pode-se concluir que as simulações de CFD são válidas e podem ser usadas para analisar o comportamento hidrodinâmico dos reatores UASB.","PeriodicalId":13167,"journal":{"name":"Holos","volume":" 4","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138995012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16340
Vinícius de Azevedo Silva, Mateus Peixoto Oliveira, Francisco Lledo dos Santos
Precipitation forecasting is essential for sectors such as water resources management and urban planning. In this study, a deep learning model was developed to predict rainfall in Brazilian cities, focusing on the municipality of Barra Mansa, Rio de Janeiro. Four neural network architectures were tested: FCN, Resnet, ResCNN and InceptionTime. Among them, FCN stood out significantly, presenting the lowest error rates and the best overall adjustment. The study highlights the ability of deep learning, especially through the FCN (Fully Convolutional Network - Segmented) architecture, to make accurate predictions and uncover hidden rainfall patterns. Such discoveries have great potential to improve rainfall forecasting systems and assist in decision-making in areas that require accurate climate information.
{"title":"MONTHLY RAINFALL FORECAST IN THE MUNICIPALITY OF BARRA MANSA/RJ USING DEEP LEARNING TIME SERIES TECHNIQUES","authors":"Vinícius de Azevedo Silva, Mateus Peixoto Oliveira, Francisco Lledo dos Santos","doi":"10.15628/holos.2023.16340","DOIUrl":"https://doi.org/10.15628/holos.2023.16340","url":null,"abstract":"Precipitation forecasting is essential for sectors such as water resources management and urban planning. In this study, a deep learning model was developed to predict rainfall in Brazilian cities, focusing on the municipality of Barra Mansa, Rio de Janeiro. Four neural network architectures were tested: FCN, Resnet, ResCNN and InceptionTime. Among them, FCN stood out significantly, presenting the lowest error rates and the best overall adjustment. The study highlights the ability of deep learning, especially through the FCN (Fully Convolutional Network - Segmented) architecture, to make accurate predictions and uncover hidden rainfall patterns. Such discoveries have great potential to improve rainfall forecasting systems and assist in decision-making in areas that require accurate climate information.","PeriodicalId":13167,"journal":{"name":"Holos","volume":"126 ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16351
Mário Sérgio da Luz, Maria Flávia Borges, Ariana de Campos, Deusmaque Carneiro Ferreira, Vinícius Carvalho Rocha, Júlio Cesar Souza Inácio Gonçalves, Diego Andrade Lemos, Cristiano Poleto
O presente trabalho apresenta um método simples para a reciclagem de resíduos de poliestireno expandido (EPS), utilizando óleo de soja residual (WCSO). O processo de recuperação de poliestireno combina a dissolução de EPS em D-limoneno com sua posterior separação e mistura com WCSO. As propriedades químicas, térmicas e morfológicas do material obtido foram caracterizadas pelas técnicas de Espectroscopia de Infravermelho com Transformada de Fourier (FTIR), Análise Termogravimétrica (TGA), Difração de Raios X (DRX) e Microscopia Eletrônica de Varredura (MEV). As características do poliestireno recuperado apresentaram alta similaridade com o poliestireno padrão (PS), o que sugere baixa contaminação por outros materiais. A grande vantagem deste método de reciclagem é que nos permite obter PS em estado sólido à temperatura ambiente, sem necessidade de aquecimento, ao contrário de outros métodos de reciclagem de EPS relatados. Os resultados são promissores e apontam para um processo viável e simples de reciclagem de EPS, oferecendo diversos benefícios ambientais.
{"title":"Reciclagem de Poliestireno Expandido (EPS) Recycling: Um processo ambientalmente favorável para a recuperação do poliestireno (PS) usando óleo de soja residual","authors":"Mário Sérgio da Luz, Maria Flávia Borges, Ariana de Campos, Deusmaque Carneiro Ferreira, Vinícius Carvalho Rocha, Júlio Cesar Souza Inácio Gonçalves, Diego Andrade Lemos, Cristiano Poleto","doi":"10.15628/holos.2023.16351","DOIUrl":"https://doi.org/10.15628/holos.2023.16351","url":null,"abstract":"O presente trabalho apresenta um método simples para a reciclagem de resíduos de poliestireno expandido (EPS), utilizando óleo de soja residual (WCSO). O processo de recuperação de poliestireno combina a dissolução de EPS em D-limoneno com sua posterior separação e mistura com WCSO. As propriedades químicas, térmicas e morfológicas do material obtido foram caracterizadas pelas técnicas de Espectroscopia de Infravermelho com Transformada de Fourier (FTIR), Análise Termogravimétrica (TGA), Difração de Raios X (DRX) e Microscopia Eletrônica de Varredura (MEV). As características do poliestireno recuperado apresentaram alta similaridade com o poliestireno padrão (PS), o que sugere baixa contaminação por outros materiais. A grande vantagem deste método de reciclagem é que nos permite obter PS em estado sólido à temperatura ambiente, sem necessidade de aquecimento, ao contrário de outros métodos de reciclagem de EPS relatados. Os resultados são promissores e apontam para um processo viável e simples de reciclagem de EPS, oferecendo diversos benefícios ambientais.","PeriodicalId":13167,"journal":{"name":"Holos","volume":"33 ","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139172954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16377
Brunno Borges Canelhas, Ariana DE CAMPOS, Deusmaque Carneiro Ferreira, Vinícius Carvalho Rocha, Cristiano Poleto, Julio Cesar DE SOUZA INÁCIO GONÇALVES, Mário Sérgio da Luz
The current work presents the use of a sorbent material to develop an alternative method for removing lead and barium from public water supplies. The sorbent material used was coconut fiber, which in addition to mitigating environmental pollution by reusing discarded waste, aids in the treatment of public water supplies by removing potentially toxic ions where conventional methods are not effective. In the alternative method used, we have a system of fixed bed reactors connected in series, with a volume of 0.250 L in each reactor. To characterize the adsorption process, we analyzed the variables pH, contact time, initial metal concentration, concentration of the sorbent material, and flow rate. Analysis of variance (ANOVA), multivariate analysis of variance (MANOVA), and the T-test were carried out. The parameters initial metal concentration and flow rate were shown to be non-significant for the confidence interval adopted in the conditions of the current work. The removal of Pb2+ and Ba2+ ions was greater than 60% in all the parameters studied, and in a single pass through the reactors, showing the viability of this procedure. Coconut fiber presented appropriate characteristics for the biosorption of lead and barium ions, constituting a sustainable and promising process to be used together with classical water treatment processes to remove potentially toxic metals.
{"title":"DESENVOLVIMENTO E ANÁLISE DE UM MÉTODO ALTERNATIVO PARA REMOÇÃO DE METAIS POTENCIALMENTE TÓXICOS DA ÁGUA EMPREGANDO MATERIAIS SORVENTES","authors":"Brunno Borges Canelhas, Ariana DE CAMPOS, Deusmaque Carneiro Ferreira, Vinícius Carvalho Rocha, Cristiano Poleto, Julio Cesar DE SOUZA INÁCIO GONÇALVES, Mário Sérgio da Luz","doi":"10.15628/holos.2023.16377","DOIUrl":"https://doi.org/10.15628/holos.2023.16377","url":null,"abstract":"The current work presents the use of a sorbent material to develop an alternative method for removing lead and barium from public water supplies. The sorbent material used was coconut fiber, which in addition to mitigating environmental pollution by reusing discarded waste, aids in the treatment of public water supplies by removing potentially toxic ions where conventional methods are not effective. In the alternative method used, we have a system of fixed bed reactors connected in series, with a volume of 0.250 L in each reactor. To characterize the adsorption process, we analyzed the variables pH, contact time, initial metal concentration, concentration of the sorbent material, and flow rate. Analysis of variance (ANOVA), multivariate analysis of variance (MANOVA), and the T-test were carried out. The parameters initial metal concentration and flow rate were shown to be non-significant for the confidence interval adopted in the conditions of the current work. The removal of Pb2+ and Ba2+ ions was greater than 60% in all the parameters studied, and in a single pass through the reactors, showing the viability of this procedure. Coconut fiber presented appropriate characteristics for the biosorption of lead and barium ions, constituting a sustainable and promising process to be used together with classical water treatment processes to remove potentially toxic metals.","PeriodicalId":13167,"journal":{"name":"Holos","volume":"28 4","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16321
Estéfani Clara, Breno Salgado Barra, Nayara Juliana Jargemboski, Gary B. Hughes, Alexandre Mikowski, João Victor Staub de Melo
The main objective of this research is to evaluate the influence of using waste generated by a coal-burning thermoelectric power plant in asphalt mixes. The matrices called fly ash, bottom ash and a composition with 50 % of each type were analyzed, and compared to conventional crushed gneissic rock particles, all used as filling material (filler) at 6.0 % passing through the mesh opening 0.075 mm, in the granulometric curves of asphalt mixes. The matrices studied are technically viable for use in asphalt mixes, creating the potential for large-scale market use of bottom ash, especially in the southern region of the State of Santa Catarina. Thus, to benefit more directly from the proximity to the source producing these inputs, the South region can explore the use of power plant waste, given the easy access and shorter transport distances.
{"title":"INFLUENCE OF THE USE OF WASTE GENERATED BY THERMOELECTRIC POWER PLANT ON SUSTAINABLE ASPHALT MIXES","authors":"Estéfani Clara, Breno Salgado Barra, Nayara Juliana Jargemboski, Gary B. Hughes, Alexandre Mikowski, João Victor Staub de Melo","doi":"10.15628/holos.2023.16321","DOIUrl":"https://doi.org/10.15628/holos.2023.16321","url":null,"abstract":"The main objective of this research is to evaluate the influence of using waste generated by a coal-burning thermoelectric power plant in asphalt mixes. The matrices called fly ash, bottom ash and a composition with 50 % of each type were analyzed, and compared to conventional crushed gneissic rock particles, all used as filling material (filler) at 6.0 % passing through the mesh opening 0.075 mm, in the granulometric curves of asphalt mixes. The matrices studied are technically viable for use in asphalt mixes, creating the potential for large-scale market use of bottom ash, especially in the southern region of the State of Santa Catarina. Thus, to benefit more directly from the proximity to the source producing these inputs, the South region can explore the use of power plant waste, given the easy access and shorter transport distances.","PeriodicalId":13167,"journal":{"name":"Holos","volume":"40 8","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.15628/holos.2023.16521
Francinaide de Lima Silva Nascimento
Apresenta a Educação Profissional destinada às mulheres a partir da análise do Ensino Doméstico em sua gênese europeia e repercussões no Brasil, nas décadas de 1910 e 1930. Fundamenta-se em jornais, livros e dicionários pedagógicos, legislação educacional e programas de ensino. Constatou-se que as edições do Congresso Internacional de Ensino Doméstico eram a referência para a configuração de ideias e práticas. O trabalho doméstico realizado pelas mulheres passou a ser legitimado como um papel social de relevância, por delimitar um espaço de ofícios ou ocupações, seja a partir de um preparo profissional para a atuação enquanto professoras primárias, administradoras de instituições ou mesmo de sua inserção no ensino agrícola. Era uma prática que legitimava a transmissão de um habitus, espaço de autodeterminação para a emancipação pessoal, social e profissional destinado às mulheres.
{"title":"PRÁTICAS DE EDUCAÇÃO DOMÉSTICA PARA A EDUCAÇÃO PROFISSIONAL FEMININA (1908-1930)","authors":"Francinaide de Lima Silva Nascimento","doi":"10.15628/holos.2023.16521","DOIUrl":"https://doi.org/10.15628/holos.2023.16521","url":null,"abstract":"Apresenta a Educação Profissional destinada às mulheres a partir da análise do Ensino Doméstico em sua gênese europeia e repercussões no Brasil, nas décadas de 1910 e 1930. Fundamenta-se em jornais, livros e dicionários pedagógicos, legislação educacional e programas de ensino. Constatou-se que as edições do Congresso Internacional de Ensino Doméstico eram a referência para a configuração de ideias e práticas. O trabalho doméstico realizado pelas mulheres passou a ser legitimado como um papel social de relevância, por delimitar um espaço de ofícios ou ocupações, seja a partir de um preparo profissional para a atuação enquanto professoras primárias, administradoras de instituições ou mesmo de sua inserção no ensino agrícola. Era uma prática que legitimava a transmissão de um habitus, espaço de autodeterminação para a emancipação pessoal, social e profissional destinado às mulheres.","PeriodicalId":13167,"journal":{"name":"Holos","volume":"27 4","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-14DOI: 10.15628/holos.2023.16482
Matheus Ribas Francisco, Ana Laura Pascucci De Oliveira, Simone Andrea Furegatti
The article presents a temporal and evolutionary analysis of linear water erosion, as from a survey of a sample hillslope of the Leopoldo river, located in the municipality of Agudos (SP). The survey was elaborated from satellite images made available by Google Earth, which allowed to identify the main characteristics of erosive features. The analyzed characteristics are: slope position, length, width, line of inclination, shape, evolutionary stage, incision system, possible origin, curvature longitudinal and transversal. So, the article made it possible to study the erosions’ behavior and the relationship with local morphology.
{"title":"LEVANTAMENTO E ANÁLISE TEMPORAL E EVOLUTIVA DAS EROSÕES HÍDRICAS LINEARES EM UMA ENCOSTA AMOSTRAL DO CÓRREGO DO LEOPOLDO","authors":"Matheus Ribas Francisco, Ana Laura Pascucci De Oliveira, Simone Andrea Furegatti","doi":"10.15628/holos.2023.16482","DOIUrl":"https://doi.org/10.15628/holos.2023.16482","url":null,"abstract":"The article presents a temporal and evolutionary analysis of linear water erosion, as from a survey of a sample hillslope of the Leopoldo river, located in the municipality of Agudos (SP). The survey was elaborated from satellite images made available by Google Earth, which allowed to identify the main characteristics of erosive features. The analyzed characteristics are: slope position, length, width, line of inclination, shape, evolutionary stage, incision system, possible origin, curvature longitudinal and transversal. So, the article made it possible to study the erosions’ behavior and the relationship with local morphology.","PeriodicalId":13167,"journal":{"name":"Holos","volume":"40 16","pages":""},"PeriodicalIF":0.1,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138974704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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