Acta Scientiarum-technology最新文献

Numerical Integration of locally Peaked Bivariate Functions 局部峰值二元函数的数值积分

4区综合性期刊

Acta Scientiarum-technology Pub Date : 2023-10-02 DOI: 10.4025/actascitechnol.v45i1.63310

Abdelhamid Taieb Zaidi

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Development of a bulk cargo fruit sampler 散装水果取样机的研制

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Acta Scientiarum-technology Pub Date : 2023-09-27 DOI: 10.4025/actascitechnol.v45i1.61804

Tulio de Almeida Machado, Haroldo Carlos Fernandes, Fábio Lúcio Santos, Clarice Aparecida Megguer, Nara Silveira Velloso

{"title":"Development of a bulk cargo fruit sampler","authors":"Tulio de Almeida Machado, Haroldo Carlos Fernandes, Fábio Lúcio Santos, Clarice Aparecida Megguer, Nara Silveira Velloso","doi":"10.4025/actascitechnol.v45i1.61804","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.61804","url":null,"abstract":"The design of an agricultural machine or equipment can be considered of great complexity, due to the interactions between the operator, the machine, the product and the environment. There is a lack of available technologies for collecting fruit in bulk cargo at any time from transport to industries. A limiting factor is the loading of fruits that are at the base of the cargo. This study was carried out to develop a detailed design of a bulk cargo fruit sampler that can collect fruits in any position of the x, y and z axes. A methodology was applied and adapted to execute the design. This methodology was divided into the following stages: design planning, informational design, conceptual design, preliminary design and detailed design. The variant considered the most appropriate was selected for the preliminary design and detailed design. The concepts were divided into chassis or support, sample collector and support for sample removal. The removal of fruits was carried out to maintain as much of their interaction with the environment outside the collector as possible. With the conclusion of the detailed design, it was possible to file, at the National Institute of Industrial Property, the patent for the collector of fruit samples in bulk cargo. Results obtained from fruits in the collector were used in doctoral theses.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":"1 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":"134903155","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

Investigation of the use of hemp fibers in recycling spinning 大麻纤维在再生纺纱中的应用研究

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Acta Scientiarum-technology Pub Date : 2023-09-27 DOI: 10.4025/actascitechnol.v45i1.63566

Eren Oner, Seher Kaya

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Rheological behavior of dehydrated cranberry suspensions: Analysis of the influence of temperature and solid concentration on Casson’s model parameters 脱水蔓越莓悬浮液的流变行为:温度和固体浓度对卡森模型参数的影响分析

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Acta Scientiarum-technology Pub Date : 2023-09-27 DOI: 10.4025/actascitechnol.v45i1.63807

Ígor Henrique de Mello Rodrigues Ciolin, Daiane Cristina Lenhard, Carolina Castilho Garcia

{"title":"Rheological behavior of dehydrated cranberry suspensions: Analysis of the influence of temperature and solid concentration on Casson’s model parameters","authors":"Ígor Henrique de Mello Rodrigues Ciolin, Daiane Cristina Lenhard, Carolina Castilho Garcia","doi":"10.4025/actascitechnol.v45i1.63807","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.63807","url":null,"abstract":"Dehydrated cranberries (Vaccinium macrocarpon) are dried fruits known for their high antioxidant potential. Changes in their mechanical and rheological properties occur when cranberries are exposed to certain conditions, such as drying or immersion in a liquid medium (rehydration). To evaluate the rheological behavior of solid suspensions made from dehydrated cranberries, the effects of different temperatures and concentrations of dissolved solids were evaluated using a factorial experimental design (22) with three replications at the center point. Five models were used to investigate the suspensions' flow behavior: Ostwald de Waelle, Newton, Herschel-Bulkley, Casson, and Bingham. The rheometry of the suspensions showed that the fluids presented non-Newtonian behavior, with a satisfactory fit for the Casson model (R² > 0.94) in all evaluated temperature and concentration ranges. Furthermore, the effects of temperature and solid concentration of cranberry suspensions on the rheological parameters of the fitted model, Casson's initial shear stress (K0c), and Casson's plastic viscosity (Kc) were evaluated. From the response and the contour surfaces, it was found that increasing the concentration of the suspension above 20% resulted in higher initial shear stress, which was influenced by temperature, whose increase resulted in a significant reduction in the shear stress at a concentration of 30%. The plastic viscosity (Kc) was highly influenced by the solid’s concentration, and higher temperatures caused a decrease in the value of this parameter. So, the highest value of plastic viscosity was found for concentrations above 20% and at lower temperatures. Therefore, considering the results and for practical purposes, it can be concluded that the flow of the suspensions is facilitated if rehydration is conducted at high temperatures.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":"43 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":"134903152","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}

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Some relations between the sets of f-statistically convergent difference sequences f统计收敛差分序列集合之间的一些关系

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Acta Scientiarum-technology Pub Date : 2023-09-27 DOI: 10.4025/actascitechnol.v45i1.59806

Sarkawt Asaad, Rifat Çolak, Yavuz Altın

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Standardization of processing parameters and color of gels aiming to replace citric pectin by mesocarp flour or pectin of passion fruit 以中果皮粉或百香果果胶代替柠檬酸果胶为目标的凝胶的工艺参数和颜色标准化

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Acta Scientiarum-technology Pub Date : 2023-09-27 DOI: 10.4025/actascitechnol.v45i1.64193

Juliana Resende Gonçalves Silva, Jhone Gleison de Oliveira, Ricardo Augusto Mendonça Vieira, Eder Dutra de Resende

{"title":"Standardization of processing parameters and color of gels aiming to replace citric pectin by mesocarp flour or pectin of passion fruit","authors":"Juliana Resende Gonçalves Silva, Jhone Gleison de Oliveira, Ricardo Augusto Mendonça Vieira, Eder Dutra de Resende","doi":"10.4025/actascitechnol.v45i1.64193","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.64193","url":null,"abstract":"The processing of passion fruit generates a huge quantity of wastes, reaching 50% in mass of rind. The main use of the rinds is to produce rind flour or to be source of pectin as a gelling agent. This work develops a standard procedure to evaluate jelly products subjected to the same temperature histories and content of soluble solids along the processing time of the gel-based product, using different concentrations of mesocarp flour and pectin. The gels were evaluated by color patterns aiming to verify the applicability of mesocarp flour as substitute of commercial pectin in jelly of fruits. The quantitative analysis of the data for temperature histories and content of soluble solids enabled to confirm the standardization of the parameters used in the production of the gels, which is important to warrant the same processing conditions during the elaboration of the different types of gels. The gels made with passion fruit’s mesocarp flour have less translucent shades and a more yellowish color than the gels produced with commercial citric pectin, however, these small differences may not interfere in the final color of fruit jelly.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":"56 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":"134903151","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

DNA Release from Polyaziridine Polyplexes Aided by Biomacromolecules: Effect of pH 生物大分子辅助聚氮吡啶复合物的DNA释放:pH的影响

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Acta Scientiarum-technology Pub Date : 2023-09-27 DOI: 10.4025/actascitechnol.v45i1.60454

Iram Bibi, Syed Waqar Hussain Shah

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Synthesis and characterization of a new ruthenium (II) terpyridyl diphosphine complex 新型三吡啶二膦钌配合物的合成与表征

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Acta Scientiarum-technology Pub Date : 2023-09-27 DOI: 10.4025/actascitechnol.v45i1.62458

Claudemir Batalini, Wagner Ferraresi De Giovani

{"title":"Synthesis and characterization of a new ruthenium (II) terpyridyl diphosphine complex","authors":"Claudemir Batalini, Wagner Ferraresi De Giovani","doi":"10.4025/actascitechnol.v45i1.62458","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.62458","url":null,"abstract":"Ruthenium complexes have been prepared for several applications, mostly for electrocatalysis, catalytic hydrogenation, energy conversion, photolysis, medicinal chemistry, among other fields. Bipyridine and terpyridine ligands are commonly found in the metal coordination sphere, including ruthenium, largely due to the high stability exhibited by the resulting complex and the possibility of greater stereochemical control during synthesis. The combination of substituted terpyridine ligands with diphosphine ligands to the metal ruthenium occurs to a lesser extent and its catalytic potential has been examined in several studies. This paper describes the synthesis of a new ruthenium (II) aqua complex containing aryl diphosphine and substituted terpyridine ligands: [Ru(L)(totpy)(OH2)](ClO4)2 (L=Ph2PCH2CH2PPh2); (totpy=4´-(4-tolyl)-2,2´:6´,2´´-terpyridine). The synthesis route was conducted in three steps; the final and the intermediate products have shown good reaction yields; the results of the characterization of the aqua complex by cyclic voltammetry, UV-visible spectroscopy and elemental analysis are consistent with the proposed chemical structure.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":"2 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":"134902102","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

Relationship between the rainfall index for Southern Brazil and the indexes of the Tropical Pacific and the Tropical Atlantic Oceans 巴西南部降水指数与热带太平洋和热带大西洋指数的关系

4区综合性期刊

Acta Scientiarum-technology Pub Date : 2023-09-27 DOI: 10.4025/actascitechnol.v45i1.58368

Beatriz Siqueira, Jonas Teixeira Nery, Ana Cláudia Carfan

引用次数: 0

Rainfall intensity model with spatialization of intensity-duration-frequency curve parameters - A case study for the state of Maranhão, Brazil 具有强度-持续时间-频率曲线参数空间化的降雨强度模型——以巴西maranh<e:1>州为例

4区综合性期刊

Acta Scientiarum-technology Pub Date : 2023-09-27 DOI: 10.4025/actascitechnol.v45i1.63369

Mariana Medeiros Coelho, Nélio Moura de Figueiredo, Maria Teresinha de Medeiros Coelho, Lúcio Carlos Pinheiro Campos Filho

{"title":"Rainfall intensity model with spatialization of intensity-duration-frequency curve parameters - A case study for the state of Maranhão, Brazil","authors":"Mariana Medeiros Coelho, Nélio Moura de Figueiredo, Maria Teresinha de Medeiros Coelho, Lúcio Carlos Pinheiro Campos Filho","doi":"10.4025/actascitechnol.v45i1.63369","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.63369","url":null,"abstract":"The characterization of intense rainfall in engineering projects is fundamental, mainly regarding the estimate of design flows necessary for designing hydraulic works. Intense rainfall events are commonly measured by Equations and curves that relate their intensity, duration, and frequency. Such relations, known as IDF, enable the hydrological characterization of a given region. This article presents a methodological design and results from both determination and spatialization of IDF curve parameters for the state of Maranhão. Historical series of maximum daily rainfalls obtained from National Water and Sanitation Agency (ANA) were used in 126 rainfall gauge stations and the Gumbel probability distribution estimated the maximum daily rainfall for 5, 10, 15, 25, 50, and 100 return periods. The Isozonal Method obtained the IDF correlations of intense rainfall events for 0,1. 1, and 24 h durations, and their performance were conducted by Nash-Sutcliffe R2 coefficient and Root Mean Square Relative Error (RMSE). “K, a, b, and c” parameters of intense rainfall equations were determined by optimization and convergence processes and their spatialization was carried out by interpolation by Inverse Distance Weighted (IDW), which enabled to determine the values of each parameter in regions without physical measurements of rainfall. Similarly, rainfall intensity was spatialized for the entire state. According to the results, the rainfall distribution in the state of Maranhão shows a variation in the indexes of precipitation, with the highest values found in areas located in central-southern, southwestern, and southeastern regions.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":"2011 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":"134903159","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