Pub Date : 2023-10-02DOI: 10.4025/actascitechnol.v45i1.63310
Abdelhamid Taieb Zaidi
The aim of this paper is to compare the relative accuracies between deterministic and stochastic methods for solving bounded integrals numerically to observe which methods tend to function well and converge to a small amount of error based on computational resources. For the deterministic method, the Gauss-Legendre quadrature method has been selected and for the stochastic method, the Monte Carlo integration has been selected. For each case, the number of variables will be adjusted to observe the effect on error. For the Gauss-Legendre quadrature method the permutations increased with the inaccuracy of 9% when the number of nodes increased to 3 but was reduced by 90% and later on the error depicted a drop as the number of nodes raised further. For the stochastic method, that was chosen from large sample size, the inaccuracy was found to be inversely proportional to the sample size. This concluded that the monte-carlo approach was not affected by the impact of dimensionality moreover, deterministic method also seemed to overcome the dimensionality constraint.
{"title":"Numerical Integration of locally Peaked Bivariate Functions","authors":"Abdelhamid Taieb Zaidi","doi":"10.4025/actascitechnol.v45i1.63310","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.63310","url":null,"abstract":"The aim of this paper is to compare the relative accuracies between deterministic and stochastic methods for solving bounded integrals numerically to observe which methods tend to function well and converge to a small amount of error based on computational resources. For the deterministic method, the Gauss-Legendre quadrature method has been selected and for the stochastic method, the Monte Carlo integration has been selected. For each case, the number of variables will be adjusted to observe the effect on error. For the Gauss-Legendre quadrature method the permutations increased with the inaccuracy of 9% when the number of nodes increased to 3 but was reduced by 90% and later on the error depicted a drop as the number of nodes raised further. For the stochastic method, that was chosen from large sample size, the inaccuracy was found to be inversely proportional to the sample size. This concluded that the monte-carlo approach was not affected by the impact of dimensionality moreover, deterministic method also seemed to overcome the dimensionality constraint.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135902371","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}
Pub Date : 2023-09-27DOI: 10.4025/actascitechnol.v45i1.61804
Tulio de Almeida Machado, Haroldo Carlos Fernandes, Fábio Lúcio Santos, Clarice Aparecida Megguer, Nara Silveira Velloso
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.
{"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":null,"pages":null},"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}
Pub Date : 2023-09-27DOI: 10.4025/actascitechnol.v45i1.63566
Eren Oner, Seher Kaya
In recycle yarn spinning, the original fibers are added to the blend as a carrier because of the recycled fibers obtained by opening from fabric scraps are very short and coarse. In the textile recycling industry, mostly petroleum-based synthetic fibers are used as carrier fibers. In an environmentally important activity such as recycling spinning, it is necessary to reduce the use of synthetics used as carrier fibers. When considered from this point of view, hemp fibers come to the fore with their important performance and environmental features. Based on this fact, in this study, in addition to the standard production conditions in the recycling yarn production facility, hemp fibers in different proportions were added to the blends to reduce the ratio of polyester as carrier fiber and the effects of this situation on yarn quality were examined. According to the results, it was observed that adding hemp fiber to the recycle yarn blend increased yarn tenacity, yarn unevenness and yarn hairiness while decreased yarn elongation properties.
{"title":"Investigation of the use of hemp fibers in recycling spinning","authors":"Eren Oner, Seher Kaya","doi":"10.4025/actascitechnol.v45i1.63566","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.63566","url":null,"abstract":"In recycle yarn spinning, the original fibers are added to the blend as a carrier because of the recycled fibers obtained by opening from fabric scraps are very short and coarse. In the textile recycling industry, mostly petroleum-based synthetic fibers are used as carrier fibers. In an environmentally important activity such as recycling spinning, it is necessary to reduce the use of synthetics used as carrier fibers. When considered from this point of view, hemp fibers come to the fore with their important performance and environmental features. Based on this fact, in this study, in addition to the standard production conditions in the recycling yarn production facility, hemp fibers in different proportions were added to the blends to reduce the ratio of polyester as carrier fiber and the effects of this situation on yarn quality were examined. According to the results, it was observed that adding hemp fiber to the recycle yarn blend increased yarn tenacity, yarn unevenness and yarn hairiness while decreased yarn elongation properties.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134903156","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}
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.
脱水蔓越莓(Vaccinium macrocarpon)是一种干果，以其高抗氧化潜力而闻名。当蔓越莓暴露在某些条件下，如干燥或浸泡在液体介质中(再水化)，其机械和流变特性就会发生变化。为了评估由脱水蔓越莓制成的固体悬浮液的流变行为，我们使用一个在中心点有三个重复的析因实验设计(22)来评估不同温度和溶解固体浓度的影响。五个模型被用来研究悬浮液的流动行为:Ostwald de Waelle, Newton, Herschel-Bulkley, Casson和Bingham。悬浮液的流变学表明，流体表现出非牛顿的行为，与Casson模型(R²>0.94)在所有评估的温度和浓度范围。进一步考察了温度和固相浓度对拟合模型流变参数、卡森初始剪切应力(K0c)和卡森塑性粘度(Kc)的影响。从响应和等高线表面可以看出，当悬浮液浓度增加到20%以上时，初始剪应力增大，且受温度的影响，当浓度达到30%时，温度升高导致剪应力显著减小。塑性粘度(Kc)受固体浓度的影响较大，温度越高，该参数值越小。因此，在浓度超过20%和温度较低的情况下，塑料粘度的最大值被发现。因此，考虑到结果和实际目的，可以得出结论，在高温下进行复水化有利于悬浮液的流动。
{"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":null,"pages":null},"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}
Pub Date : 2023-09-27DOI: 10.4025/actascitechnol.v45i1.59806
Sarkawt Asaad, Rifat Çolak, Yavuz Altın
In this study we establish the relations between the sets of difference sequences which are statistically convergent in connection with modulus functions.
本文用模函数建立了统计收敛的差分序列集合之间的关系。
{"title":"Some relations between the sets of f-statistically convergent difference sequences","authors":"Sarkawt Asaad, Rifat Çolak, Yavuz Altın","doi":"10.4025/actascitechnol.v45i1.59806","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.59806","url":null,"abstract":"In this study we establish the relations between the sets of difference sequences which are statistically convergent in connection with modulus functions.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134903153","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}
Pub Date : 2023-09-27DOI: 10.4025/actascitechnol.v45i1.64193
Juliana Resende Gonçalves Silva, Jhone Gleison de Oliveira, Ricardo Augusto Mendonça Vieira, Eder Dutra de Resende
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.
{"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":null,"pages":null},"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}
Pub Date : 2023-09-27DOI: 10.4025/actascitechnol.v45i1.60454
Iram Bibi, Syed Waqar Hussain Shah
The pH dependence of heparin and dextran sulfate aided release of DNA from its polyplexes with polyaziridine (PA) has been investigated using Quartz crystal microbalance with dissipation monitoring (QCM-D). The acoustic behavior of ternary systems indicated that the DNA decondensation was favored at physiological pH. When pH < 7.4, PA was significantly positively charged and ternary complexation occurred. When pH exceeded 7.4, very small proportion of DNA was released upon heparin addition due to marked reduction in cationic nature of PA. An increase in thickness at the interface due to adsorbed material at pH 9.0 showed the retention of heparin on the surface despite of negligible release of DNA. In terms of PA binding, heparin proved to be a better competitor than dextran sulfate.
{"title":"DNA Release from Polyaziridine Polyplexes Aided by Biomacromolecules: Effect of pH","authors":"Iram Bibi, Syed Waqar Hussain Shah","doi":"10.4025/actascitechnol.v45i1.60454","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.60454","url":null,"abstract":"The pH dependence of heparin and dextran sulfate aided release of DNA from its polyplexes with polyaziridine (PA) has been investigated using Quartz crystal microbalance with dissipation monitoring (QCM-D). The acoustic behavior of ternary systems indicated that the DNA decondensation was favored at physiological pH. When pH < 7.4, PA was significantly positively charged and ternary complexation occurred. When pH exceeded 7.4, very small proportion of DNA was released upon heparin addition due to marked reduction in cationic nature of PA. An increase in thickness at the interface due to adsorbed material at pH 9.0 showed the retention of heparin on the surface despite of negligible release of DNA. In terms of PA binding, heparin proved to be a better competitor than dextran sulfate.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134902105","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}
Pub Date : 2023-09-27DOI: 10.4025/actascitechnol.v45i1.62458
Claudemir Batalini, Wagner Ferraresi De Giovani
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.
{"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":null,"pages":null},"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}
Pub Date : 2023-09-27DOI: 10.4025/actascitechnol.v45i1.58368
Beatriz Siqueira, Jonas Teixeira Nery, Ana Cláudia Carfan
The proposed study verified the possible influences of sea surface temperature (SST) anomalies in the equatorial Pacific and the tropical Atlantic on the rainfall in the southern region of Brazil. The rainfall stations used have monthly data for the period from 1977 to 2015 and are distributed throughout that region. Monthly TSM anomalies in the Niño 3.4 and Niño 1 + 2 areas, the Southern Oscillation Index and the Monthly Tropical South Atlantic Temperature Index were also used, from the database provided by the Climate Prediction Centre. The results show the association of precipitation in the South region with variations in sea surface temperature in the Tropical Pacific Ocean and, to a lesser extent, with sea surface temperatures in the Tropical South Atlantic Ocean.
{"title":"Relationship between the rainfall index for Southern Brazil and the indexes of the Tropical Pacific and the Tropical Atlantic Oceans","authors":"Beatriz Siqueira, Jonas Teixeira Nery, Ana Cláudia Carfan","doi":"10.4025/actascitechnol.v45i1.58368","DOIUrl":"https://doi.org/10.4025/actascitechnol.v45i1.58368","url":null,"abstract":"The proposed study verified the possible influences of sea surface temperature (SST) anomalies in the equatorial Pacific and the tropical Atlantic on the rainfall in the southern region of Brazil. The rainfall stations used have monthly data for the period from 1977 to 2015 and are distributed throughout that region. Monthly TSM anomalies in the Niño 3.4 and Niño 1 + 2 areas, the Southern Oscillation Index and the Monthly Tropical South Atlantic Temperature Index were also used, from the database provided by the Climate Prediction Centre. The results show the association of precipitation in the South region with variations in sea surface temperature in the Tropical Pacific Ocean and, to a lesser extent, with sea surface temperatures in the Tropical South Atlantic Ocean.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134902104","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}
Pub Date : 2023-09-27DOI: 10.4025/actascitechnol.v45i1.63369
Mariana Medeiros Coelho, Nélio Moura de Figueiredo, Maria Teresinha de Medeiros Coelho, Lúcio Carlos Pinheiro Campos Filho
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.
工程项目中强降雨的表征是基本的，主要是关于设计水工工程所需的设计流量的估计。强降雨事件通常通过与其强度、持续时间和频率相关的方程和曲线来测量。这种关系被称为IDF，使某一地区的水文特征得以确定。本文介绍了maranh状态的IDF曲线参数的确定和空间化的方法设计和结果。利用126个雨量站的历史最大日降雨量序列，利用Gumbel概率分布估计了5、10、15、25、50和100个回归期的最大日降雨量。等纬法获得了2001年强降水事件的IDF相关。采用Nash-Sutcliffe R2系数和均方根相对误差(Root Mean Square Relative Error, RMSE)评价其处理效果。通过优化和收敛过程确定强降雨方程的“K, a, b, c”参数，并通过IDW插值对其进行空间化，从而在没有降雨物理测量的地区确定各参数的值。同样，整个州的降雨强度也被空间化了。结果表明，马兰河州的降水分布在降水指标上存在一定的差异，在中南部、西南部和东南部地区降水量最大。
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