Navegando por Autor "Nogueira, Marcelo"

Agora exibindo 1 - 9 de 9

Análise da atenuação da onda ultrassonora em peças de madeira de Pinus taeda L.
(2019-12-03) Barbosa, Sarah Ollivia Fraga; Nogueira, Marcelo; http://lattes.cnpq.br/2791448000405507; http://lattes.cnpq.br/3988638254767389
Non-destructive assessment of wood is classified as the use of one or more methods that quantify the physical-mechanical properties without compromising the end use of the material. In partnership with the Laboratory of Binder Technology of the Federal University of Pernambuco, the present work aims to study the application of the ultrasound method in Pinus taeda L. wood pieces. The material was purchased in wood shop in Recife - PE, from which 12 bars were selected, from which 2 contiguous specimens were taken, measuring about 5 cm X 5 cm X 15 cm, from each piece. The specimens were subjected to ultrasound tests using flat-faced piezoelectric transducers of 54 kHz frequency. After the readings, the specimens were selected and subjected to through-holes in the center of the longitudinal direction with the help of ½” and 1” flat drills and, once again, submitted to ultrasound tests. After data analysis, an average material density of 0.43 g/cm³ was obtained, ultrasound readings resulted in mean velocity waves of 4450.71 m/s and mean dynamic constant of 8866.33 MPa for the longitudinal direction, of intact specimens. For the ½” drill perforated condition, ultrasound readings revealed a 2.51% drop in mean velocity compared to the readings of intact parts and a 5% drop in constant dynamics. For the 1” drill bits, the readings showed a decrease in the average propagation speed of 10.10% and a constant dynamic decline of 18.11% when compared to the intact pieces. Finally, considering the means comparison test using the Tukey test at 95% probability, it is possible to state that the ultrasound wave method has sensitivity to evaluate the mass loss of Pinus taeda L. pieces.
Caracterização de material lenhoso como fonte energética viável no Brasil: uma análise sistemática da produção científica brasileira
(2021-07-13) Melo, Vitória Larissa Moreira; Nogueira, Marcelo; http://lattes.cnpq.br/2791448000405507; http://lattes.cnpq.br/5399606076137792
The search for renewable energy sources has been growing rapidly over time. When wood is used for energy production, some characteristics must be taken into account, such as the growth or dendrological characteristics of the plant, as these significantly influence the production of individual dry matter or by area, in addition to its composition (chemical, elementary and immediate). The objective of this work was to use the scientific literature to understand the main characteristics associated with woody material, so that it can be considered a good source of energy. The methodology used for this work was the selection of studies carried out from a systematic review, where 174 articles were analyzed and synthesized. These studies were published from 2000 to mid-2021 in English, Spanish and Portuguese. The vast majority of studies were carried out in the Brazilian state of Minas Gerais, followed by São Paulo, Santa Catarina and Pará. The species used in the articles for analyzes and laboratory tests were tree species of the genus Eucalyptus sp. (44%), Pinus sp (8%) and other species (48%). There was a sharp increase in the production of articles in the North and Northeast regions during the last 6 (six) years. The units of analysis targeted by these studies were wood characteristics such as basic density, higher calorific value, volatile materials content and total lignin content. These variables were statistically analyzed in a non-parametric way. Therefore, woody materials with a basic density of 0.6 g.cm-3, higher calorific value of 19.7 MJ.kg-1, volatile materials content and lignin content of 27.79% and 28 % respectively. The importance of having scientific material for consultation regarding the use of forest biomass as energy material is due to the dissipation of information to the main interested parties in the use of forest biomass and woody material as an energy source.
Carbonização e análise imediata do carvão vegetal da madeira de Mimosa caesalpiniaefolia Benth e Cupania racemose (Vell.) Radlk
(2018-03-01) Gonçalves, Caio Pedro da Silveira; Nogueira, Marcelo; http://lattes.cnpq.br/2791448000405507
This paper had the objective of determining the gravimetric yield of the carbonization of Mimosa caesalpiniaefolia and Cupania racemose for charcoal characterization of the wood of these species and indicate the most viable for use as fuel. For the study, six individuals from Mimosa caesalpiniaefolia Benth and six from Cupania Racemosa (Vell.) Radlk were collected at the Pedra Bonita site in Chã-grande, PE, Brazil. The individuals were sectioned in disks along the shaft and later, chips of dimensions 49 x 20 x 4 mm were made along the trunk. The chips were homogenized, comminuted, quarteted and transported to the Forest Technology Laboratory of the Federal Rural University of Pernambuco. Each carbonization was conducted in a total time of 210 minutes at a maximum temperature of 460 ± 10 ° C in a temperature-controlled muffle type oven, rate of 1.4 °C/min after the first hour. NBR 8112/1986 was used, which prescribes the method for the immediate analysis of charcoal. In addition to the NBR, the immediate analysis was conducted according to an adaptation from CETEC (1982) to ASTM (American Society for Testing and Materials) standards. The basic density found for Mimosa caesalpiniaefolia and Cupania racemose was, respectively, 0.87 and 0.83 g / cm 3. The values of ash, volatile matter content, fixed carbon and gravimetric yield for the Sabiá were 1.74%, 46.89%, 44.49% and 44.34%, respectively; and for the Cabotã was 0.25%, 55.26%, 51.36% and 44.12%, respectively. Therefore, both the charcoal coming from Mimosa caesalpiniaefolia and from Cupania racemos have satisfactory characteristics for energy purposes. However, in comparison among the species studied, Cupania racemosa is the most suitable for use as fuel.
Descrição do método construtivo e das espécies mais utilizadas na construção naval tradicional no litoral sul pernambucano
(2019-12-13) Vasconcelos, Teylor Moura de; Nogueira, Marcelo; http://lattes.cnpq.br/2791448000405507; http://lattes.cnpq.br/1146968481041111
Traditional boats are directly linked to the history of Brazil and its riverside communities. The traditional shipbuilding industry is one of the most important commercial activities in the world. The wood has excellent physical and mechanical properties and because it is a renewable material stands out among the materials that can be used in shipbuilding, taking into account the scarcity of non-renewable mineral resources. Based on this premise, this study aims to identify the wood and describe the construction method and the identification of the wood used in the fabrication of structural parts of traditional fishing vessels in the southern coast of Pernambuco. For the development of the activity will be interviewed naval carpenters, focused on the techniques of construction of wood pieces, which make up the structural and aesthetic set of the vessels, and the identification of the most used species. The analysis will be conducted considering that, in the traditional form of vessel construction, maintenance is performed every six months, due to the intrinsic characteristics of the wood, changes in the composition of the structure of the piece such as presence of xylophagous agents (fungi, termites and drills), drying defects (cracking, crushing, presence of knots). The project seeks to qualify naval heritage, a threatened segment of Brazilian heritage due to the significant loss of traditional vessels, human knowledge associated with them, knowledge about raw materials extracted from forests and their production techniques, to the detriment of new technologies and materials for naval production and also the social and environmental degradation of the traditional riverside communities of the southern Pernambuco coast. Currently using only four species: Pequiá (Caryocar villosum), Louro vermelho (Nectandra rubra), Sucupira Preta (Bowdichia virgilioides), Jaqueira (Artocarpus heterophyllus).
Madeiras nativas para a fabricação da rabeca nordestina: descrição dos processos mecânicos das madeiras envolvidas na produção e seu impacto na manifestação cultural cavalo marinho
(2024-02-06) Silva, Lais Deosdede da; Nogueira, Marcelo; http://lattes.cnpq.br/3921855854247393
This course conclusion work aims to document the mechanical processes of unfolding wood from native species used as raw material in the artesanal construction of fiddles and the impact of the instrument on the manifest popular culture of Cavalo Marinho. Research carried out by public bodies, scientific articles, books, reports, theses and dissertations produced that cover the description of the rabeca making process by craftsman Zé de Nininha, resident in Ferreiros City, Zona da Mata North Of t Pernambuco State, in addition to bibliographies that detail the native woods used, where the objective is to understand the relevance and social impact caused by the use of said artefact in the manifestation of the State's popular culture known as Cavalo Marinho. Additionally, singularities were identified in the carving procedures used by the crafstman, strictly related to the type of wood available in the region. Some tree species are valued due to the physical and mechanical properties of the wood that directly affect the acoustic characteristics and fiddle-making techniques. The production of this instrument is passed from master to apprentice, from the choice of wood within ideal parameters to the final carving and tuning adjustments. Through a bibliographical survey of the mechanical processes for splitting native wood, and the identification of the forest species used in the manufacture of this instrument, it was possible to provide information for future research, mainly in the area of Technology and Use of Forest Products and valorization of popular knowledge.
Potencial de falha em árvores utilizando tomógrafo de impulso na Praça da Madalena em Recife/PE
(2024-03-05) Silva Junior, Israel Vicente da; Nogueira, Marcelo; http://lattes.cnpq.br/2791448000405507; http://lattes.cnpq.br/2353404237882065
In the city of Recife - PE, the falling of trees mainly results from factors such as the absence of well-structured vegetation, due to the occurrence of pests, pathogens, and mechanical failures. Therefore, the structural evaluation of urban trees has become a priority, as the good condition of trees distributed throughout the city is crucial. To perform this evaluation, non-destructive methods, such as impulse tomography, are essential as they do not compromise the mechanical properties of the trees. Thus, the objective of this work was to evaluate the structural condition of the trees in Madalena Square in the municipality of Recife - PE through non-destructive tests. The research was conducted in Madalena Square, where six trees that make up the vegetation of the green area were examined. To evaluate the presence and level of internal deterioration of the tree trunks, the non-destructive analysis method using the impulse tomograph ARBOTOM was used. Furthermore, based on the interpretation of degradation indicative graphs generated by the equipment, it was possible to classify the degree of trunk deterioration, categorizing them with low, medium, high, or severe potential for failure. Of the evaluated individuals, three trees showed a better structural conservation state of their stems. On the other hand, the fourth evaluated tree demonstrated the highest mechanical compromise, as it has termites, boring insects, decaying fungi, as well as poorly executed pruning in its trunk. There is a possibility of the presence of xylophagous agents and decaying fungi, even to a lesser extent, in the core of tree two, since it showed a mechanical failure in its central region, without any external indication of degradation. The third tree, on the other hand, has structural fragility related to the action of mechanical forces, such as traction and compression of fibers, due to its inclination. All trees showed structural fragility caused mainly by the action of xylophagous agents and decaying fungi, in addition to the inclination of the evaluated trunks. Therefore, it is necessary to take actions to replace some tree specimens, considering that the worsening of trunk degradation poses a direct risk to the users of Madalena Square.
Potencial energético dos resíduos gerados em madeireiras na Região Metropolitana do Recife - PE
(2018) Damacena, Rafael Santos; Nogueira, Marcelo; Silva, Thiago Cardoso; http://lattes.cnpq.br/8962087913561252; http://lattes.cnpq.br/2791448000405507; http://lattes.cnpq.br/0769907892300910
The exponential growth of the population brings with it several problems. Among them, a greater demand in the generation of energy of polluting sources and greater amount of residues generated. The objective of this work was to evaluate the energy potential of residues generated in two logging. Samples were collected at two logging sites located in the Metropolitan Region of Recife, in Pernambuco. The first sample obtained consisted of the mixture of dust residues of the species Maçaranduba (Manilkara sp.) And Jatobá (Hymenaea sp.). The second sample was a mixture of residues from two species, Maçaranduba and another unidentified The analyzes were carried out at the Forest Technology Laboratory, Department of Forestry Science, Federal Rural University of Pernambuco. The carbonisations were carried out in a digital muffle with temperature control of the brand MAGNU'S model 0910. The carbonization was performed at a rate of 1.4°C/min. Four carbonizations were performed, two for each sample. For the immediate analysis of the charcoal, the adaptation of the CETEC (1982) to ASTM (American Society for Testing and Materials) standards was used, thus it was possible to determine the contents of volatile material, ashes and by fixed carbon difference, dry basis. Charcoal produced by the mixed waste from two logging had an acceptable ash and ash content. The content of volatile materials is higher than desired and as a consequence has a lower fixed carbon content. The higher calorific value is above the average found in the study of Manilkara sp., Probably because the source material is not only maçaranduba. There was no significant difference between the results obtained by the samples, except for the moisture content.
Programa de educação tutorial: PET UFRPE: construindo o futuro rompendo barreiras e unindo conhecimentos
(EDUFRPE, 2022) Brito, Dorothy Bezerra Silva de; Nogueira, Marcelo
Rendmax, software para cálculo e análise de volume e rendimento máximo em madeira serrada
(2024-03-05) Coelho, Gustavo Andrade; Nogueira, Marcelo; http://lattes.cnpq.br/2791448000405507; http://lattes.cnpq.br/3210826106891832
A sawmill is a location where logs of wood are received, stored, processed, and subsequently dried for a specific period. Sawmills are commonly classified based on their daily production, that is, their yield, categorizing them into small, medium, and large scale. Various factors influence this yield, and in the absence of proper control or monitoring, there is a tendency for production losses. As an alternative, sawmill automation emerges as a viable solution, especially through the utilization of information technology. This involves implementing optimization systems for cutting calculations, which can be developed using progxanumng languages such as HTML, CSS, and JavaScript. In this context, the aim of this work was to develop software for optimizing the sawing of wood logs to achieve maximum volume and yield in wood utilization. In developing the mathematical models used to estimate the volume and maximum yield of sawn wood from a log, as well as the corresponding software, four predefined scenarios commonly used in sawmills were considered. In each of these scenarios, calculations were manually performed using the same values employed in the program tests, with the goal of verifying the software's proper functioning in each established scenario. Subsequently, following the calculation methodology, software was developed to optimize the process of converting wood logs into mechanically processed pieces. This software was built using programming languages JavaScript, HTML, and CSS. HTML was used to structure the website. while CSS was responsible for the design, colors, shadows, size, and positioning of elements. JavaScript was responsible for the software's source code, that is, the program's interactivity, including input requests, variable creation, internal calculations, interactions, interactive menus, animations, and validations. By combining these three languages, it became feasible to automate the data acquisition process following the same empirical reasoning, based on equations. However, in this case, with an approach carried out through the creation of codes and commands using programming languages. This enables achieving the desired result, maximizing log utilization according to the scenario, demonstrating its effective applicability in the market.