Acta Scientiarum-technology最新文献_第5页

Phosphorus concentrations in sediments from the equatorial Amazon estuary, Furo of Muriá, Pará State, Brazil 巴西帕尔<e:1>州穆里伊<e:1>富罗赤道亚马逊河口沉积物中的磷浓度

IF 0.8 4区综合性期刊

Acta Scientiarum-technology Pub Date : 2022-12-19 DOI: 10.4025/actascitechnol.v45i1.60888

A. Sousa, R. M. A. Mendes, Francianne Vieira Mourão, Maamar El Robrini, J. Pereira, Pedro Henrique Campos Sousa, M. L. S. Santos

引用次数: 0

Nomograms for maximum pressure angles in radial cams with follower eccentricity for cycloidal and harmonic motion curves 带从动件偏心的径向凸轮的摆线和谐波运动曲线的最大压力角图

IF 0.8 4区综合性期刊

Acta Scientiarum-technology Pub Date : 2022-12-19 DOI: 10.4025/actascitechnol.v45i1.57823

Artur F. Avelar, Luisa Fernandes Soares

引用次数: 0

Physical-chemical characteristics and modeling of the dehydration curve for Viola x wittrockiana mass loss 紫堇质量损失脱水曲线的理化特性及建模

IF 0.8 4区综合性期刊

Acta Scientiarum-technology Pub Date : 2022-12-19 DOI: 10.4025/actascitechnol.v45i1.59783

Jessica Paula Aparecida Costa Fonseca, A. M. Leitão, G. R. Liska, Lucas Santos Bastos

{"title":"Physical-chemical characteristics and modeling of the dehydration curve for Viola x wittrockiana mass loss","authors":"Jessica Paula Aparecida Costa Fonseca, A. M. Leitão, G. R. Liska, Lucas Santos Bastos","doi":"10.4025/actascitechnol.v45i1.59783","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.59783","url":null,"abstract":"The edible flowers have in their constitution proteins, lipids, starch, vitamins, important minerals for a healthy diet, as well as bioactive compounds recognized for their potential effects on human health. Due to the high perishability of the flowers, their marketing represents a challenge, and drying is a method that contributes to the preservation of the product. Given the above, the present study aims verify which is the curve that best adjusts to the mass loss during the dehydration process through the proposition of Boltzmann nonlinear regression model in face of classical dehydration curve models, as well measure in frozen flowers centesimal composition of Viola × wittrockiana flowers. The flowers were dehydrated at 30°C in an air circulation oven up to constant weight. The centesimal composition of the dehydrated Viola × wittrockiana is 84.69% humidity, 8.76% carbohydrates, 2.51% proteins, 2.41% crude fiber, 1.23% ash, 0.40% lipids and 48.68 Kcal. With respect to phenolic compounds, the frozen and dehydrated flowers showed 423 and 301 mg gallic acid equivalents per gram and, about antioxidant activity, showed 90.67 to 94.93% inhibition of the DPPH radical (2,2-Diphenyl-1-picrylhydrazyl) and 44.00 and 49.00 mg of Trolox.100 g-1. The Boltzmann model showed best fit the mass loss of Viola × wittrockiana and through this model the maximum mass loss occurs with 0.16 g, the maximum rate of mass loss of Viola × wittrockiana occurs in 46.7 min, whose mass loss is 0.66 g. The dehydration proved to be an efficient method to preserve the flowers because the bioactive compounds did not present significant losses after the application of this process.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":"3 6 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86562926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of solvent extraction on phenolic concentration and antioxidant capacity of the Oedogonium sp. (Chlorophyta) using a simplex-centroid mixture design 溶剂萃取对叶绿藻酚类物质浓度和抗氧化能力的影响

IF 0.8 4区综合性期刊

Acta Scientiarum-technology Pub Date : 2022-12-19 DOI: 10.4025/actascitechnol.v45i1.61471

Rodolfo José Tofoli, Adriana Luiza Ferreira, Eutímio Gustavo Fernández Núñez, C. Haminiuk, C. Z. Branco, Ivanise Guilherme Branco

{"title":"Effects of solvent extraction on phenolic concentration and antioxidant capacity of the Oedogonium sp. (Chlorophyta) using a simplex-centroid mixture design","authors":"Rodolfo José Tofoli, Adriana Luiza Ferreira, Eutímio Gustavo Fernández Núñez, C. Haminiuk, C. Z. Branco, Ivanise Guilherme Branco","doi":"10.4025/actascitechnol.v45i1.61471","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.61471","url":null,"abstract":"Among the freshwater benthic macroalgae found in Brazilian rivers and streams, species of Oedogonium (Chlorophyta) have shown great ability to produce high biomass in several environmental conditions. Their resilience to eutrophic habitats provides an opportunity to assess the use of Oedogonium biomass for applications in different fields, especially those related to the extraction of biologically active compounds of interest for health, food, and cosmetic applications. Thus, this study assessed the effects of different organic solvents (acetone, ethanol, and methanol) and their mixtures when combined with water (20% v/v), on the extraction efficiency of total phenolic compounds (TPC), and their antioxidant capacity (AC), from Oedogonium sp. biomass, using simplex-centroid mixture design. TPC ranged from 90 to 150 mg of gallic acid equivalent per 100 g dry weight (DW), while AC ranged from 1 to 8 µM of Trolox equivalent per gram (DW). The highest TPC and AC were found for extracts using an ethanol/acetone (50:50) binary aqueous solvent mixture, while the lowest values for both TPC and AC were found for the methanolic aqueous solvent. Considering the relatively low-cost and less adverse environmental impacts of the ethanol and acetone aqueous mixture, our results suggest that the use of this specific mixture of organic solvents may have significant advantages in an eventual industrial process for the extraction of phenolic compounds from Oedogonium species.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":"109 2","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72386748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Briquettes produced from the mixture of agro-industrial residues composed of eucalyptus sawdust with turnip or corn cob cake 由桉树木屑与萝卜或玉米芯饼组成的农用工业残留物混合制成的压块

IF 0.8 4区综合性期刊

Acta Scientiarum-technology Pub Date : 2022-12-19 DOI: 10.4025/actascitechnol.v45i1.57883

Amanda de Araújo Drago, Adriana Ferla de Oliveira, G. B. Muniz, J. G. Teleken, Alexandre Leseur dos Santos, Lilian Cristina de Souza Madalena, Silvia Maccari Petricosck, A. B. Santos

{"title":"Briquettes produced from the mixture of agro-industrial residues composed of eucalyptus sawdust with turnip or corn cob cake","authors":"Amanda de Araújo Drago, Adriana Ferla de Oliveira, G. B. Muniz, J. G. Teleken, Alexandre Leseur dos Santos, Lilian Cristina de Souza Madalena, Silvia Maccari Petricosck, A. B. Santos","doi":"10.4025/actascitechnol.v45i1.57883","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.57883","url":null,"abstract":"The generation of waste and/or by-products in the agro-industrial sector is inevitable and, depending on the situation, it can lead to inadequate disposal. The aim of this study was to evaluate the physical properties and the energetic viability of agro-industrial residues composed of the mixture of eucalyptus sawdust with turnip or corn cob cake. The experiment was set up in a completely randomized design with eight treatments, resulting from the mixture of eucalyptus sawdust with turnip/corn cob cake. Pure residues were characterized by immediate analysis, calorific value and thermogravimetric analysis. For briquettes, immediate analysis; apparent and energetic density; diametrical compression resistance, HCV, LCV and thermogravimetric analysis were carried out. For statistical analyses, the Tukey's test was applied in qualitative analyses and regression was used in quantitative analyses with the Sisvar statistical software. The volatile material content decreases as forage turnip cake is added; the composition of 50% of forage turnip cake and 50% of eucalyptus (TN50) presented 76.38% of it, while composition containing 15% of cake, 79.87%. The ash content increased from 3.25% (TN15) to 6.27% (TN50). Both HCV and LCVdecreased with the addition of turnip cake from 17.73% (TN15) to 16.96% (TN50) for HCV and from 16.38% (TN15) to 15.64% (TN50) for LCV. In thermograms, the temperature at which peaks appear is similar among the different mixtures. In the resistance test, the addition of forage turnip cake significantly influenced the addition of residues, increasing from 0.76 MPa (TN15) to 1.52 MPa (TN50). Considering the analyses carried out, and comparing them with results in literature, it is possible to verify that both, briquettes produced from forage turnip cake and those made from corn cob, have energy potential.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":"76 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83854157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analysis of relative efficiency of vessels of passenger transportation in the Brazilian Amazon: an AHP-DEA approach 巴西亚马逊地区客运船舶相对效率分析:AHP-DEA方法

IF 0.8 4区综合性期刊

Acta Scientiarum-technology Pub Date : 2022-08-26 DOI: 10.4025/actascitechnol.v45i1.58199

E. Loureiro, N. Figueiredo, Lúcio Carlos Pinheiro Campos Filho, T. Filgueiras

{"title":"Analysis of relative efficiency of vessels of passenger transportation in the Brazilian Amazon: an AHP-DEA approach","authors":"E. Loureiro, N. Figueiredo, Lúcio Carlos Pinheiro Campos Filho, T. Filgueiras","doi":"10.4025/actascitechnol.v45i1.58199","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.58199","url":null,"abstract":"Waterway transport is of great importance for the population of the Amazon Region. It is responsible for moving, according to Agência Nacional de Transportes Aquaviários (Antaq, 2018), approximately 9.8 million passengers and 3.4 million tons of cargo distributed by state, interstate longitudinal transport interstate and crossing. However, despite the great importance, there are several blockages related to the conditions of the roads and vessels in certain routes. The study in question proposes the use of a mathematical tool to analyze vessels from the relative efficiency involving parameters of input and output for two analysis scenarios: Energy Efficiency Analysis and Modality Analysis, being analyzed variables such as power, consumption, total time of the trip, total distance of the line of action, passenger capacity and ticket price. For that, the data of 652 vessels used in the Amazon region registered in the Brazilian states (Pará, Amazonas, Amapá and Rondônia) were verified, and from these data, a sample space of 148 vessels from the same utilization level was selected. With these data, a model was developed using the Data Envelopment Analysis (DEA) methodology, with the aid of the DEA-Solver software. After the use of the solver, the relative efficiency indexes of each vessel were obtained, allowing to rank and measure the efficient and inefficient Decision Units (DMU'S). Lastly, analysis of the general characteristics of efficient vessels were made in order to stratify the parameters that may have transformed them into efficient DMU`s, making it possible to trace a profile of the type of vessel employed in each type of line, thus helping in decision making of new projects.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":"15 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74409855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Feasibility of the expectation-maximization algorithm for assessing individuals with different sensory perceptions in discrimination of specialty coffees 期望最大化算法评估不同感官知觉个体对精品咖啡辨别的可行性

IF 0.8 4区综合性期刊

Acta Scientiarum-technology Pub Date : 2022-08-26 DOI: 10.4025/actascitechnol.v45i1.60184

Larissa Karolina de Oliveira, M. Resende, F. M. Borém, M. A. Cirillo

{"title":"Feasibility of the expectation-maximization algorithm for assessing individuals with different sensory perceptions in discrimination of specialty coffees","authors":"Larissa Karolina de Oliveira, M. Resende, F. M. Borém, M. A. Cirillo","doi":"10.4025/actascitechnol.v45i1.60184","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.60184","url":null,"abstract":"The results of sensory evaluations of coffees are associated with latent factors, such as the particular subjectivity of each individual. Based on the foregoing, assessing the quality of a sensory panel for product discrimination basically depends on the statistical methodology to be used in data analysis. Following this argument, this study aimed to evaluate the feasibility of the EM - Expectation Maximization algorithm in discriminating groups of individuals, characterized by the degree of experience and knowledge in sensory analysis of coffees of different varieties, produced in the Serra da Mantiqueira micro-region, with different processing and altitudes. The main advantage of this algorithm is the fast convergence, when the current solution approaches the optimal solution with high precision. The disadvantage is because it is a deterministic optimization technique, which can only achieve a local optimization depending on the initialization, i.e., initial values input in the iterative procedure. It can be concluded that estimates of the correlation matrices obtained by the EM algorithm showed that the final grade has a greater influence of sweetness, in addition to discriminating groups of consumers with different sensory perceptions and in situations where the number of individuals in each group is unknown, the EM algorithm was accurate in estimating the proportion of individuals belonging to each group, assuming that the correlations of sensory responses follow a bivariate normal distribution.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":"152 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76574673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Breakthrough analysis of continuous fixed-bed dehydration of gas streams using 4A zeolite molecular sieve 4A沸石分子筛连续固定床气流脱水的突破性分析

IF 0.8 4区综合性期刊

Acta Scientiarum-technology Pub Date : 2022-08-26 DOI: 10.4025/actascitechnol.v45i1.58764

G. Carvalho, Bruno Cappellari, Rubi Böhmer Júnior, L. F. Trierweiler, J. O. Trierweiler, M. Farenzena

引用次数: 1

Combined Ensemble Intrusion Detection Model using Deep learning with Feature Selection for Fog Computing Environments 基于深度学习和特征选择的雾计算环境集成入侵检测模型

IF 0.8 4区综合性期刊

Acta Scientiarum-technology Pub Date : 2022-08-26 DOI: 10.4025/actascitechnol.v45i1.60551

Kalaivani Kaliyaperumal, Chinnadurai Murugaiyan, Deepan Perumal, G. Jayaraman, Kannan Samikannu

{"title":"Combined Ensemble Intrusion Detection Model using Deep learning with Feature Selection for Fog Computing Environments","authors":"Kalaivani Kaliyaperumal, Chinnadurai Murugaiyan, Deepan Perumal, G. Jayaraman, Kannan Samikannu","doi":"10.4025/actascitechnol.v45i1.60551","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.60551","url":null,"abstract":"Decentralized architecture known as fog computing is situated between the cloud and data-producing devices. It acts as a conduit between cloud services and IoT devices. In order to reduce latency, fog computing can handle a significant amount of computation for time-sensitive IoT applications. The Fog layer is simultaneously vulnerable to numerous assaults. To defend the fog nodes from attacks, fog computing paradigms may be suited for deep learning-based intrusion detection systems (IDS). In this paper, a combined Ensemble Intrusion Detection Model using Deep learning with Efficient Feature Selection using Random forests is proposed for Fog Computing Environments by using two deep learning models of traditional CNN and IDS-AlexNet model called Ensemble CNN-IDS with Random Forest and showed this model gives high accuracy of attack detection. The respective model implementations demonstrated on the UNSW-NB15 dataset that consists of 9 classes of attacks namely Fuzzers, Analysis, Backdoors, DoS, Exploits, Generic, Reconnaissance, Shellcodes and Worms. The proposed combined Ensemble Intrusion Detection Model using Deep learning with Efficient Feature Selection for intrusions detection is shown to be accurate and efficient by using different classifiers. Our proposed model provides high the accuracy in attack detection of about 97.5% that it outperformed various other traditional and recent models.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":"40 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84774648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mix design of large-stone asphalt mixtures for heavy-traffic roads 重交通道路用大石料沥青混合料配合比设计

IF 0.8 4区综合性期刊

Acta Scientiarum-technology Pub Date : 2022-08-26 DOI: 10.4025/actascitechnol.v45i1.59011

Z. G. Mascarenhas, Igor Amorim Beja, K. Vasconcelos, L. Bernucci

引用次数: 0