Colloquium Exactarum最新文献_第2页

CARACTERIZAÇÃO MORFOLÓGICA DE MICROFIBRAS ELETROFIADAS DE POLIESTIRENO 聚苯乙烯静电纺丝微纤维的形态表征

Colloquium Exactarum Pub Date : 2023-11-10 DOI: 10.5747/ce.2023.v15.e401

Beatriz Marques Carvalho, Gabriel da Cruz Dias, Luz Marina Andrade Maruoka, Rosane Freire Boina, Deuber Lincon da Silva Agostini

{"title":"CARACTERIZAÇÃO MORFOLÓGICA DE MICROFIBRAS ELETROFIADAS DE POLIESTIRENO","authors":"Beatriz Marques Carvalho, Gabriel da Cruz Dias, Luz Marina Andrade Maruoka, Rosane Freire Boina, Deuber Lincon da Silva Agostini","doi":"10.5747/ce.2023.v15.e401","DOIUrl":"https://doi.org/10.5747/ce.2023.v15.e401","url":null,"abstract":"Since wastewater treatment is of great interest to society, it is important to develop techniques that perform this treatment by removing pollutants such as dyes, pesticides, and metals. In this context, adsorption stands out as a promising method in the treatment of effluents, allied to this, as polymeric membranes considerably improve the ability to remove pollutants. Carbon-based additives, such as graphene oxide, have been used in the area of adsorption because they are an adsorbent capable of removing metallic ions and dyes. Thus, it is interesting to carry out studies of the polystyrene polymer with graphene oxide, aiming at the production of adsorbent membranes. To this end, the production of polystyrene was first analyzed, with graphene oxide added to the polymer matrix in the future. Thus, polystyrene microfibers were produced using the electrospinning technique and analyzed morphologically using optical microscopy and scanning electron microscopy (SEM). With the help of ImageJ and OriginPro 8.5 software, a histogram of the frequency distribution of microfiber diameters and the normal curve was created. Through the results obtained, it was observed that there was the production of microfibers with considerable morphology, as fibers with beads and agglomerates were not observed.. From the histogram, it was noted that the microfibers had an average diameter of 5.73 µm.","PeriodicalId":30414,"journal":{"name":"Colloquium Exactarum","volume":" 22","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135190954","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}

引用次数: 0

AVALIAÇÃO COMPARATIVA DA QUALIDADE DOS DADOS DE ELEVAÇÃO OBTIDOS COM GNSS, GOOGLE EARTH E SRTM PARA PROJETOS DE ESTRADAS 道路项目GNSS、谷歌EARTH和SRTM高程数据质量的比较评价

Colloquium Exactarum Pub Date : 2023-09-27 DOI: 10.5747/ce.2023.v15.e400

George Miguel Farha Diban, Barbara Stolte Bezerra, Maria Lígia Chuerubim

{"title":"AVALIAÇÃO COMPARATIVA DA QUALIDADE DOS DADOS DE ELEVAÇÃO OBTIDOS COM GNSS, GOOGLE EARTH E SRTM PARA PROJETOS DE ESTRADAS","authors":"George Miguel Farha Diban, Barbara Stolte Bezerra, Maria Lígia Chuerubim","doi":"10.5747/ce.2023.v15.e400","DOIUrl":"https://doi.org/10.5747/ce.2023.v15.e400","url":null,"abstract":"Obtaining terrain elevation data is essential for numerous engineering applications. However, regardless of the technique used to obtain the elevation data, there will be errors intrinsic to the instruments and to the measurement technique used, as well as depending on the model of Earth representation, which are plane, spherical or ellipsoidal. In this perspective, this work proposes a comparative approach between the elevation data obtained from the geodesic coordinates, provided by Global Navigation Satellite System (GNSS), and those obtained from Google Earth (GE) and Shuttle Radar Topography Mission (SRTM). The data collection was carried out in the urban section between km 125 to km 145,500 of Dom Pedro-I Highway (SP-065), State of São Paulo, Brazil. The quality of the results is evaluated based on the Mean Quadratic Error (RMSE). The main results showed that the elevation data obtained through the SRTM show greater agreement or adjustment to the GNSS data when compared to the higher quality and less variation than those obtained through the GE, since they have smaller RMSE and are closer to the average elevations calculated for the highway segment analyzed. However, it is worth noting that the use of GE can be a good alternative for low-cost preliminary studies.","PeriodicalId":30414,"journal":{"name":"Colloquium Exactarum","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135536270","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}

引用次数: 0

ATIVIDADE ENZIMÁTICA EM SOLOS ARENOSOS MANEJADOS COM SAF NO PONTAL DO PARANAPANEMA 用SAF处理的沙质土壤的酶活性

Colloquium Exactarum Pub Date : 2023-01-06 DOI: 10.5747/ce.2022.v14.e398

Letícia Aparecida Costa Magro, Rita de Cássia Lima Mazzuchelli, Marcelo Rodrigo Alves

引用次数: 0

APRENDIZAGEM DE MÁQUINA PARA IDENTIFICAÇÃO DE PLANTAS DE SOJA SOB ATAQUE DE INSETOS USANDO DADOS HIPERESPECTRAIS 利用高光谱数据的机器学习识别受昆虫攻击的大豆植物

Colloquium Exactarum Pub Date : 2023-01-05 DOI: 10.5747/ce.2022.v14.e393

Daniel Veras Correa, A. Ramos, Lucas Prado Osco, L. A. C. Jorge

{"title":"APRENDIZAGEM DE MÁQUINA PARA IDENTIFICAÇÃO DE PLANTAS DE SOJA SOB ATAQUE DE INSETOS USANDO DADOS HIPERESPECTRAIS","authors":"Daniel Veras Correa, A. Ramos, Lucas Prado Osco, L. A. C. Jorge","doi":"10.5747/ce.2022.v14.e393","DOIUrl":"https://doi.org/10.5747/ce.2022.v14.e393","url":null,"abstract":"The integration between the areas of remote sensing and machine learning has allowed an advance in the way of mapping agricultural fields and monitoring crops. This work investigates the ability of machine learning algorithms to classify soybean plants under insect attack, using reflectance spectroscopy measurements collected at the leaf level. To this end, tests were developed with different algorithms using a set of 991 spectral curves referring to healthy soybean plants under attack by pests, collected in eight consecutive days. These curves were measured by the EMBRAPA team, using a portable spectroradiometer, which records in the range of 350 to 2500 nm. Such curves were, initially, pre-processed to remove the regions of atmospheric absorption by water vapor, and then subdivided into a set of training, validation and testing of the machine learning algorithms. The Google Collabs interpreter was used and the algorithms were written in Python language, using libraries such as Skit Sklearn. Among the algorithms used, there are Random Forest, Decision Tree, Support Vector Machine, Logistic Regression and Extra-Tree. The Extra-tree has better performance (F1-score = 80.40%; precision = 81%; recall = 80%) in the proposed task. It is concluded that it is possible to process reflectance spectroscopy measurements with machine learning algorithms to monitor insect attack on soybean plants. It is recommended that the applied approach be tested in other cultures.","PeriodicalId":30414,"journal":{"name":"Colloquium Exactarum","volume":"103 25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86534726","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}

引用次数: 0

ELABORAÇÃO E CARACTERIZAÇÃO FÍSICO - QUÍMICA DE QUEIJO Petit SUISSE ADICIONADO DE FIBRA DE BAMBU 添加竹纤维的小瑞士奶酪的制备和物理化学表征

Colloquium Exactarum Pub Date : 2023-01-05 DOI: 10.5747/ce.2022.v14.e396

Alessandro Igor Da Silva Lopes, Amanda Magalhães das Neves, João Fernando Gomes de Oliveira, Natacha Moriana Canei, Rafael Schlaucher Krass Zacarão, Rafaela Ansiliero, Richeli Stefanello, Georgia Ane Raquel Sehn, E. Rigo

引用次数: 0

NANOPARTÍCULAS DE DIÓXIDO DE TITÂNIO E ÓXIDO DE ZINCO: SÍNTESE, CARACTERIZAÇÃO E AÇÃO FOTOCATALÍTICA EM EFLUENTES INDUSTRIAIS 二氧化钛和氧化锌纳米颗粒:工业废水的合成、表征和光催化作用

Colloquium Exactarum Pub Date : 2023-01-05 DOI: 10.5747/ce.2022.v14.e397

Naiara Maria Pavani, D. A. Macena, Jacqueline Roberta Tamashiro, L. H. C. Silva, Maryane Pipino Beraldo Almeida, A. Kinoshita

{"title":"NANOPARTÍCULAS DE DIÓXIDO DE TITÂNIO E ÓXIDO DE ZINCO: SÍNTESE, CARACTERIZAÇÃO E AÇÃO FOTOCATALÍTICA EM EFLUENTES INDUSTRIAIS","authors":"Naiara Maria Pavani, D. A. Macena, Jacqueline Roberta Tamashiro, L. H. C. Silva, Maryane Pipino Beraldo Almeida, A. Kinoshita","doi":"10.5747/ce.2022.v14.e397","DOIUrl":"https://doi.org/10.5747/ce.2022.v14.e397","url":null,"abstract":"The reuse of effluent water is one of the main challenges to achieve a more sustainable development. Dyes from the textile industry can percolate, contaminate soils and affect water courses. Advanced Oxidative Processes (AOP), such as heterogeneous photocatalysis with UV light radiation and metallic nanoparticles, generate reactive oxygen species and hydroxyl radicals that can reduce effluent pollutants. This work synthesized zinc oxide (ZnO-NP) and titanium dioxide (TiO2-NP) nanoparticles in order to photodegrade methylene blue and tartrazine yellow dyes. The crystallographic and morphological characterization of the nanoparticles was performed by X-ray diffraction and high resolution scanning electron microscopy. The syntheses produced nanometric particles. The methylene blue dye had greater degradation by TiO2-NP (82 to 85%), whereas the tartrazine yellow dye with ZnO-NP (79.6% removal). It is concluded that the nanoparticles combined with POA are an effective alternative for the photocatalytic degradation of dyes.","PeriodicalId":30414,"journal":{"name":"Colloquium Exactarum","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84054473","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}

引用次数: 0

RECONSTRUÇÃO 3D DE CENAS E OBJETOS A PARTIR DE IMAGENS DIGITAIS 从数字图像中重建场景和物体的三维

Colloquium Exactarum Pub Date : 2023-01-05 DOI: 10.5747/ce.2022.v14.e389

Fabrício Milanez, Francisco Assis da Silva, Flávio Pandur Albuquerque Cabral, Leandro Luiz de Almeida, A. O. Artero, M. A. Piteri

引用次数: 0

ARTEACHINGVR: O ENSINO DAS ARTES AUXILIADO PELA REALIDADE VIRTUAL NAS ESCOLAS DE ENSINO FUNDAMENTAL ESTADUAL BRASILEIRO ARTEACHINGVR:巴西公立小学的虚拟现实辅助艺术教学

Colloquium Exactarum Pub Date : 2023-01-05 DOI: 10.5747/ce.2022.v14.e388

Guilherme Antonio Gomes Nascimento, Margarida Nascimento, Robson Augusto Siscoutto

{"title":"ARTEACHINGVR: O ENSINO DAS ARTES AUXILIADO PELA REALIDADE VIRTUAL NAS ESCOLAS DE ENSINO FUNDAMENTAL ESTADUAL BRASILEIRO","authors":"Guilherme Antonio Gomes Nascimento, Margarida Nascimento, Robson Augusto Siscoutto","doi":"10.5747/ce.2022.v14.e388","DOIUrl":"https://doi.org/10.5747/ce.2022.v14.e388","url":null,"abstract":"The art discipline aims to develop in the student a critical interaction with the complexity of the world and favor respect for the diversity of cultures and peoples. The current methodology in the classroom uses traditional and non-technological methods for teaching and learning this type of discipline, generating demotivation to the student. The insertion of technology in the classroom, such as Virtual Reality, can help in the abstraction of problems and concepts intrinsic to the discipline, motivating it in its teaching/learning process. However, there are few applications being used in public schools due to lack of resources or interest. Therefore, this paper presents a virtual reality tool that provides interactive three-dimensional virtual environments in order to assist the teaching/learning of students at the Brazilian elementary school of Art discipline. The virtual environments were evaluated by the project researchers by means of a specific usability questionnaire for this type of environment, obtaining a final average of 4.67 of 5.0, being considered suitable for use in the future in classrooms.","PeriodicalId":30414,"journal":{"name":"Colloquium Exactarum","volume":"394 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86826459","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}

引用次数: 1

ANÁLISE TEÓRICA PELO MÉTODO DA RESISTÊNCIA DIRETA DE SEÇÕES DUPLAS DE PERFIS DE AÇO FORMADOS A FRIO SOB COMPRESSÃO 冷弯钢双截面抗压直接强度法的理论分析

Colloquium Exactarum Pub Date : 2023-01-05 DOI: 10.5747/ce.2022.v14.e387

D. Zambrano, Larissa Maria Volcov Alves, Matheus Lessa Moreira, R. Nunes

{"title":"ANÁLISE TEÓRICA PELO MÉTODO DA RESISTÊNCIA DIRETA DE SEÇÕES DUPLAS DE PERFIS DE AÇO FORMADOS A FRIO SOB COMPRESSÃO","authors":"D. Zambrano, Larissa Maria Volcov Alves, Matheus Lessa Moreira, R. Nunes","doi":"10.5747/ce.2022.v14.e387","DOIUrl":"https://doi.org/10.5747/ce.2022.v14.e387","url":null,"abstract":"The need for lighter, lower-cost construction has intensified, so the presence of cold-formed profiles has become common in civil construction, offering greater efficiency in the ability to withstand the current demands. The present article aimed at the theoretical study on the stability of double U and U lipped sections, composed of cold formed steel profiles, submitted to compression. Under the justification of analyzing the effectiveness of this type of structural element, with the help of the CUFSM Software that uses the Finite Strip Method, and verify the resistance by the Direct Strength Method (DSM). The objectives of this study were: to investigate the modeling in the CUFSM software for a double section with profiles connected to each other; and apply the DSM to the theoretical analysis of double sections with Brazilian commercial profiles. It was found that the variation in the number of connections influences the analysis and can reproduce the partial connection behavior. The application of folds proved to be efficient, with little influence on local instability and considerable influence on distortion instability. The DSM showed a loss of resistance for the models that presented a local failure mode, being, therefore, the most important factor regarding the resistance.","PeriodicalId":30414,"journal":{"name":"Colloquium Exactarum","volume":"97 2-3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78138846","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}

引用次数: 0

CARACTERIZAÇÃO QUÍMICA DE BIOCARVÕES PRODUZIDOS A PARTIR DE BIOSSÓLIDO E BAGAÇO DE CANA-DE-AÇÚCAR 生物固体和甘蔗甘蔗渣生产的生物炭的化学特性

Colloquium Exactarum Pub Date : 2023-01-05 DOI: 10.5747/ce.2022.v14.e394

Janardelly Gomes de Souza, Marcelo Rodrigo Alves

{"title":"CARACTERIZAÇÃO QUÍMICA DE BIOCARVÕES PRODUZIDOS A PARTIR DE BIOSSÓLIDO E BAGAÇO DE CANA-DE-AÇÚCAR","authors":"Janardelly Gomes de Souza, Marcelo Rodrigo Alves","doi":"10.5747/ce.2022.v14.e394","DOIUrl":"https://doi.org/10.5747/ce.2022.v14.e394","url":null,"abstract":"The adequate characterization of solid residues is important, as it makes it possible to estimate the variability of its composition, helping to define its use in the soil. The objective of the presente study was to characterize raw materials and biochars produced under laboratory conditions, in order to analyze their feasibiity for use in the soil. Thus, the biochars were produced from the dry sample of biosolid and, from a dry sample of sugarcane bagasse, separately, by means of slow pyrolysis at a temperature of 350°C. A design with five replications was used, where the treatments were constituted by: pure biosolid (BP); pure sugarcane bagasse (BCP); biosolid biochar (BB); sugarcane bagasse biochar (BBC). The evaluation of raw materials and biochars was through immediate analysis, hydrogenion potential, electrical conductivity, organic matter, total nitrogen, cátion Exchange capacity, and X-ray fluorescence spectrometry. The data obtained in the characterization of the materials were submited to analysis of variance by the SISVAR program. To compare the means, the Tukey test was used program. To compare the means, the Tukey test was used at 5% probability (p<0.05). BP and BB had more alcaline pH, higher ash contente, higher nitrogen content and cátion Exchange capacity. While the BCP nd BBC showed higher values for organic matter and carbono. The raw materials and their respective biochars showed characteristics suitable for agricultural use, mainly BP and BB, and BP and BB can be used as soil correctors, as They have na alcaline pH of 12.02 and 9.64.","PeriodicalId":30414,"journal":{"name":"Colloquium Exactarum","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79492264","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}

引用次数: 0