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Artigo
Applying Potra-Pták iterative cycle for solving highly nonlinear structural problems
(2023-09-15) Rocha Segundo, Jackson da Silva; Silveira, Ricardo Azoubel da Mota; Silva, Andrea Regina Dias da; Barros, Rafael Cesário; Lemes, Igor José Mendes
When solving nonlinear algebraic equations that arise from discretization using the finite element method (FEM), it is often observed that the standard Newton-Raphson (N-R) iteration either fails to converge or necessitates a large number of iterations in the vicinity of critical points. This work proposes an additional numerical strategy, known as the Potra-Pták iterative cycle, to improve the efficiency of solving highly nonlinear structural problems. Therefore, the focus here is on making the nonlinear solver more robust and efficient, allowing the analysis of more complex nonlinear structures. In the Potra-Pták iterative cycle, two corrections of the objective function (energy function) are performed. The introduction of a second correction in the iterative cycle makes the Potra-Pták strategy more efficient than the standard or modified N-R iterations. This numerical strategy was implemented in the homemade Computational System for Advanced Structural Analysis (CS-ASA) program. The program is based on the FEM and is capable of performing static and dynamic nonlinear analysis of steel, concrete, and composite structures, and its efficiency is then verified through the analysis of slender frames and arches. The algorithm details for solving the nonlinear structural problem, characterized by the Potra-Pták scheme, are provided.
Artigo
Application of ethylene synthesis inhibitor in arabica coffee on field infestation, preference, and performance of Hypothenemus hampei
(2023-09-27) Martins, J. O. J.; Souza, B. H. S.; Costa, D. C. M.; Carneiro, F. S.; Dias, D. M.; Silva Júnior, M. B.
Coffee berry borer (CBB) Hypothenemus hampei is the major pest of coffee fruits worldwide. Bioregulators have been applied in crop plants with the aim of changing their physiology and metabolism for better yield and quality of produce, but little knowledge exists on the effects on insect pests. This study evaluated application of ethylene synthesis inhibitor in arabica coffee on CBB field infestation, preference, and performance in function of application time and dose. Field experiments were conducted in Lavras, Brazil, and the effects of ethylene synthesis inhibitor Mathury™ on CBB were evaluated using five treatments: control (water); Time1 + Dose1; Time1 + Dose2; Time2 + Dose1; and Time2 + Dose2. The first and second applications were performed at 80 and 110 days after flowering, respectively, using the doses of 2 and 15 L ha−1. CBB field infestation was recorded through time as the percent bored fruits, and the colonization in the beans and degree of fruit maturation were evaluated at harvest. CBB preference and colonization were assessed in dual-choice bioassay and the performance under no-choice condition in the lab. Plants treated with the bioregulator overall presented fruits less suitable for CBB preference and performance in terms of females choice and survival in the lab, but varying effects were found between field experiments for bored fruits (%), which increased with fruit maturation. In the second field experiment, reduced larvae and pupae infestations were found in bioregulator-treated fruits. Application of ethylene synthesis inhibitor is promising to complement CBB management in sustainable coffee crops. Future research should evaluate the underlying induced-resistance mechanisms.
Artigo
Aplicação dos estilos de ensino de Muska Mosston no futebol um olhar à perspectiva dos técnicos
(2023-12-21) Costa, Mateus Cesário; Oliveira, Vitor Pereira de; Carneiro, Kleber Tuxen; Bruzi, Alessandro Teodoro
Soccer coaches at the youth level are a vital factor in developing efficient players. Beliefs about how sport should be taught determine the actions covered in training. The present study aimed to identify which Muska Mosston Corpoconsciência, Cuiabá-MT, v. 27, e16558, p. 1-17, 2023 | ISSN 2178-5945 DOI: https://doi.org/10.51283/rc.27.e16558 Costa e colaboradores 2 de 17 teaching style is most used in sports initiation. This work collected data from a translated and adapted version of the Instrument to collect teachers' beliefs about their teaching styles with 7 coaches. The results revealed that the divergent discovery style was the most used. Considering only the sub-9 coaches, the most chosen teaching style was the command style. Considering the sub-13 coaches, the most notable style was that of divergent discovery. Finally, the sub-15 coaches selected the task style. It is concluded that the coaches presented beliefs more focused on a production style.
Artigo
Application Frequency and Colonization of the Rhizosphere of Strawberry (Fragaria × ananassa Duchesne) Plants by Azospirillum brasilense
(2023-11-13) Oliveira, Altino Junior Mendes de; Cavalcanti, Vytória Piscitelli; Rodrigues, Filipe Almendagna; Santos, Vera Lucia dos; Julio, Aline Daniela Lopes; Castro Molina, Yulimar; Pasqual, Moacir; Martins, Adalvan Daniel; Fufato, Léo; Dória, Joyce
The use of growth-promoting bacteria in agriculture has been highlighted for its potential to improve crop yield, facilitate plant growth, and increase stress tolerance. The use of inoculants based on Azospirillum brasilense may become an alternative to the application of agricultural inputs for being able to fix nitrogen, solubilize phosphates, and produce phytohormones, besides its potential to reduce the use of fertilizers. The objective of this study was to evaluate the effect of different frequencies of Azospirillum brasilense application via soil on strawberry cultivation, measuring phytotechnical, physiological, nutritional, and anatomical characteristics. Strawberry cv. Pircinque seedlings from in vitro cultivation were acclimatized, transplanted into pots, and maintained in a greenhouse. Five treatments were used, consisting of (T1) single inoculation; (T2) inoculation every 15 days; (T3) inoculation every 30 days; (T4) control with complete nutrient solution without inoculation; and (T5) control with reduced nutrient solution without inoculation. The nutrient solution was applied every 15 days in the controls. Plants with biweekly inoculations were superior to the controls and other treatments in terms of phytotechnical and physiological characteristics, and also resulted in higher densities of total bacteria, measured by quantitative real-time PCR (qPCR). The treatment with a single application of the inoculant resulted in significant increases in root length and dry biomass. Therefore, inoculation with Azospirillum brasilense demonstrates promising results in terms of reducing fertilizer demand and eliciting a positive response to inoculation.
Artigo
Aplicação da técnica de vinheta em estudos sobre processos decisórios
(2023-01-02) Ornellas, A. L. M. B.; Barros, D. C. C.; Castro, C. C.; Araújo, U. P.
One of the techniques to collect data on the phenomenon of human judgments is the vignette that would be the creation of hypothetical scenarios. The present work aims to carry out an integrative review in order to identify how the vignette technique has been applied in studies on organizational decision-making processes. In this sense, a bibliographic survey of the last 5 years was carried out via Scopus. In all, 17 studies were identified that applied the technique in the context of decision making. The results indicate that the technique has been applied in studies on organizational decision-making processes, mainly in decisions related to the supply chain and with a strong presence of statistical tests and additional controls to verify the internal and external validity, as well as the presence of biases. The main contribution is to indicate paths for the development of new studies that apply less conventional techniques.