Navegando por Assunto "Natural resources"

Agora exibindo 1 - 18 de 18

Acesso aberto (Open Access)
Análise bibliométrica da produção científica das pós-graduações do NAEA e NUMA relacionado à temática recursos naturais na Amazônia
(Universidade Federal do Pará, 2022-02-25) NEVES, João Paulo Pastana; SANTOS JUNIOR, Roberto Lopes dos; http://lattes.cnpq.br/3355963647616547
Bibliometric analysis of the dissertations defended in the postgraduate program in sustainable development of the moist tropic (PPGDSTU) and the postgraduate program in natural resource management and local development in the Amazon (PPGEDAM) at the Federal University of Pará. It aims to identify the main research currents linked to the access of natural resources. The research is characterized as quantitative, descriptive and bibliometric, from the survey of the dissertations in the online portals of the programs (PPGDSTU and PPGEDAM), Institutional Repository of UFPA (Riufpa), and on the Curriculum Lattes Platform. The year of defense analysis, research themes and more productive researchers were selected, presenting the main research strands and offering a "state of the art" in the scientific production of PPGDSTU and PPGEDAM. It was used as research tools: a) The software VOSviewer to identify the main thematic trends of postgraduate programs analyzed; b) The Wordclouds.com software in order to elaborate clouds of keywords, aiming at mapping the most used terms and discussed in the analyzed dissertations, and c) The Software Gephi to view the scientific collaboration network between teachers and tasks of the programs. The first year of defense of each program was adopted until 2018. It was found that so PPGEDAM as PPGDSTU have 172 dissertations produced between 2009 to 2018 while PPGDSTU / NAEA has 254 dissertations between 1987 to 2018 and, as for teachers which more guided in the PPGDSTU, 39 guiders were counted, while in PPGEDAM, has 27. It is concluded that research carried out in these programs through the natural resources theme in the Amazon, have been contributing to a more sustainable and predatory planet of predatory actions. It is also suggested the stimulus of collaborative partnerships between programs, creating academic master's incentives at PPGEDAM and Professional Master in PPGDSTU, in which it will contribute to the increase in the productivity of the institution. It is also suggested the implementation of research fueling scholarships to improve the performance of the programs, thus avoiding the oscillation of scientific productivity.
Acesso aberto (Open Access)
Análise sobre crescimento populacional e transição demográfica: limites e divergências
(União Atlântica de Pesquisadores, 2022-04) CARVALHO, André Cutrim; CARVALHO, David Ferreira; CASTRO, Auristela Correa
The main objective of this article is to understand why population growth is seen as a "threat" to environmental balance and to the well-being of the population. From a methodological point of view, the article used exploratory-qualitative research. That said, it was possible to conclude that the results achieved through the process of demographic transition in the world, as well as the population level achieved in the current scenario, indicate favoring the theory proposed by Ester Boserup in opposition to the theoretical assumptions of Thomas Robert Malthus. This is so, among other reasons, due to the drop in human mortality, which made possible a considerable populationincrease. In fact, Boserup's theory, in addition to constituting one of the great divergences from the Malthusian population growth theory, became important in attesting that population growth implies growth for the agricultural sector, culminating in an increase in food production, the which drives technological advancement through technical-productive improvement and “intensive cultivation”and, by itself,minimizes the impacts on natural resources and biodiversity by promoting sustainable land use.
Acesso aberto (Open Access)
Caracterização de material compósito incorporado com fibras de bambu (Bambusa Vulgaris) e resíduos sólidos industriais para utilizacao como componente estrutural para a construcao civil
(Universidade Federal do Pará, 2020-03-12) SANTOS, Alessandro José Gomes dos; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
In the industry, the production of materials that bring less environmental impacts and that have high sustainability has been growing, mainly with regard to vegetable fibers and industrial waste. In this work, full isophthalic unsaturated polyester matrix, composites with bamboo vegetable fiber, composites with industrial residues (red mud, kaolin and copper) and hybrid composites with variation in the proportion of residues and fibers were made. The residues were used with granulometry of 100 MESH and the fibers in the lengths of 15mm and 30 mm, randomly arranged within the matrix. These fibers were used in natura and treated with 5% NaOH during the period of 2 (two) hours. The fibers were characterized in terms of their physical, mechanical and morphological properties. The composites were made by hand (hand lay-up) in the form of rectangular plates in metallic mold and pressed. The proportions of the mass fractions of the residues varied by 10%, 20%, 30% and 40%, whereas the mass fraction of fibers was varied by 1%, 2% and 3%. For the production of hybrid composites, the variation occurred up to the maximum saturation level of the matrix, with the proportion of residues / fibers of 10% / 3%, 20% / 3%, 30% / 3% and 40% / 3%, respectively. Bamboo fibers were chemically characterized by analyzing the levels of extractives, lignin and holocellulose. The residues were characterized mineralogically by means of X-Ray Diffraction (XRD). The composites were characterized physically (apparent porosity, water absorption and apparent specific mass), mechanically (traction, flexion and impact), flame retardancy and morphologically through Scanning Electron Microscopy (SEM) analysis. For physical characterization analyzes, 10 specimens (CP’s) were produced for each series. In the mechanical tests, 10 CP's were manufactured for the tensile tests, while for the flexion and impact tests, there were 8 CP's for each series. This same amount was used for the flame retardancy tests. After the physical tests, a small variation was observed with the addition of fibers and an increase in the Apparent Specific Mass with the addition of residues and fibers in the matrix. In the analysis by means of mechanical traction characterization, the best results of resistance limits in the values of 33.05 MPa were obtained for composites with 3% bamboo fibers treated with 15 mm in length and 33.11 MPa with bamboo fibers 30mm long without treatment. With the incorporation of waste, it reached a value of 40.25 MPa. In hybrid fractions the value reached 41.07 MPa with the addition of 20% kaolin residue / 3% bamboo fibers in the 15mm lengths with treatment. In flexion tests, the results were 150.94 MPa for the addition of treated 30mm fibers, 140.34 MPa for the addition of 20% kaolin residue and in the hybrids of 137.27 MPa for the addition of 30% kaolin residue / 3% bamboo fibers with 30mm treated. In the impact tests, the best results were 23.02 kJ / m² for the addition of 10% copper residue and 38.56 kJ / m² for the addition of 20% copper residue / 3% bamboo fibers with 30 mm long treated.
Acesso aberto (Open Access)
Changes in the relationship between society and nature in the Mezzo-region of Southeastern Pará, Amazon, Brazil
(Instituto Nacional de Pesquisas da Amazônia, 2009) MONTEIRO, Maurílio de Abreu; COELHO, Maria Célia Nunes; SILVA, Regiane Paracampos da
With this work, the authors wish to show some of the alterations in the pattern of relations between society and nature, which have taken place throughout the 20th century in the Parauapebas and Itacaiúnas river valleys, as well as in parts of the Tocantins River valley, in southeastern Pará. This is accomplished through descriptions based on Coudreau's first-hand accounts (1889), transcribed in "Voyage a Itaboca et a L'Itacayuna", published in 1897, which depicts an area almost totally covered by forest. This is followed by a counter view made possible through the LandSat 5 satellite sensors, with images of those valleys in 2001, showing the consequences of society transformations and pressure on natural resources, and above all the dramatic decrease in the size of the forest, reduced to 52 percent of the 63,000 square kilometers analyzed herein.
Acesso aberto (Open Access)
A Cogestão de recursos em reserva extrativista da Amazônia: o caso da Resex Terra Grande-Pracuúba, Pará, Brasil
(Universidade Federal do Pará, 2022-11-24) MAGNO, Giselle Gomes; AZEVEDO-RAMOS, Claudia; http://lattes.cnpq.br/1968630321407619
The Extractive Reserves (Resex) of the Amazon represent a natural laboratory for studies of models of co-management of shared resources between the State (manager) and communities (residents). The premise of a shared management or co-management model starts from the construction of cooperation between individuals and/or institutions that use resources through participatory mechanisms and processes implemented to create support for the cooperation of groups that use resources (eg, territory, extractive area and natural resources). This study analyzes the adherence of the governance system of the Resex Terra Grande-Pracuúba, located on Ilha de Marajó, Pará, Brazil, to the principles considered necessary for the construction of an effective co-management for the governance of common use resources. In addition to identifying the relationship of forces between the State and the traditional population in the management of resources and in the use of the territory, mainly in decision-making and in conflict resolution, evaluating the arenas of concertation and their relationships. The study made it possible to identify, through documents and interviews, some principles that reached greater maturity in the implementation eg: Defined limits, Congruence between appropriation and provision rules and local conditions, Minimum recognition of organizational rights; Nested enterprises) and where improvement is needed (eg, Collective Choice Arrangements; Monitoring; Graduated Sanctions; Conflict Resolution Mechanisms). The hierarchical relationship between the decision-making arenas exist (local meetings would support the meetings by poles, which in turn would support the Management Board). However, they are still fragile in terms of their frequency, functioning and protagonism of communities and ICMBio in issues associated with co-management of the territory. The transgression of governance principles for the use of resources and territory can be illustrated both by the lack of fundamental management instruments for the administration of the RESEX, such as a Management Plan, which makes it difficult to organize economic and environmental actions on the use of resources within the Unit, but also (and mainly) due to the ineffectiveness of the co management instruments already implemented. The good participation of the actors indicates that there is interest in these spaces, however bureaucratic and unilateral interests can inhibit active participation. The analysis of the co-management of the Terra Grande-Pracuúba Extractive Reserve concludes that the governance system implemented was not effective in the shared management of the use of natural resources and territory. In addition, decision-making in collective arenas presented difficulties in applying the rules for the use of natural resources and territory for the pacification of conflicts, for the reproduction of the traditional way of life and for the support of cooperation between groups of users.
Acesso aberto (Open Access)
Entre o extrativismo e a catação: utilização das sementes de andiroba (Carapa Guianensis Aublet.) no Município de Marapanim (Pará, Brasil)
(Universidade Federal do Pará, 2012-04-26) FURTADO, Diego Corrêa; SILVA, Luís Mauro Santos; http://lattes.cnpq.br/7285459738695923; SABLAYROLLES, Maria das Graças Pires; http://lattes.cnpq.br/0250972497887101
Andiroba (Carapa guianensis Aublet) is a plant species typical of semi-flooded or non-flooded forests, but, in Pará state (Brazil), its seeds disperse through water courses, reaching beaches. From such fact, the present study issued to investigate how the productive and symbolic appropriation of this species is performed by human populations who live in the mentioned beaches, also comparing the collected data with the information described in the scientific literature, which, so far, has been concentrating its efforts on the forest context. Field research was at Marapanim municipality, and as study method, it was chosen the case study, associated to participatory observation, interviews with semi-structured scripts, guided visits and thematic debates. The study concluded that the extraction of the andiroba seeds oil in Marapanim is based on technical knowledge and symbolic constructions introduced by people came from areas where andiroba tree is typical. Such work increases familiar income during the months that follow the species period, but the absence of andiroba trees at the local beaches brings doubts on the way how the research subjects express their identification as extractivists.
Acesso aberto (Open Access)
Estudo da incorporação de resíduos industriais, lama vermelha e caulim, nas propriedades de compósitos de matriz poliéster reforçados com fibras de juta e malva
(Universidade Federal do Pará, 2022-07-18) RIBEIRO, Maurício Maia; SILVA, Alisson Clay Rios da; http://lattes.cnpq.br/7389345867032737; https://orcid.org/0000-0001-9186-2287; CANDIDO, Verônica Scarpini; http://lattes.cnpq.br/8274665115727809; https://orcid.org/0000-0002-3926-0403
The Amazon region of Brazil is a major producer of bauxite and kaolin, with the state of Pará accounting for a large national share of the production of these materials. The processing of these raw materials generates considerable amounts of waste that is then stored in sedimentation ponds which can cause serious environmental damage, therefore it is very important to explore reasonable methods of utilizing the red mud and kaolin waste, and thus reduce their landfill volumes. Many recent studies have been conducted and presented various ways of comprehensive utilization of these wastes. Natural fiber reinforced composites with insertion of these industrial wastes have received increasing attention in recent decades, as good specific mechanical properties can be achieved and industrial wastes can be reduced and used in a useful form. In this work, polyester matrix composite materials reinforced by jute and mallow fibers in continuous configuration and aligned at 0° and 90° in the loading direction, and composite materials with insertion of industrial waste were manufactured. The polyester matrix used was a pre-accelerated orthophytalic and cured at room temperature with methyl ethyl ketone peroxide 1.0% by mass. The Jute and mallow fibers were manually cut in length of 300 mm and manually arranged in a continuous manner and aligned and without surface treatment. Fiber composites were produced by vacuum-assisted hand lay-up/vaccum-bagging procedure. The proportions of the fiber volume fraction have varied by 5, 15 e 25 %. The composites with kaolin and red mud residues were manufactured by a manual process in the form of silicone and pressed mold. The proportions of the mass fractions of waste have varied by 5, 10, 15, 20, 25 e 30 %. The residues were characterized in terms of their physical, morphological and chemical aspects and the fibers in terms of their physical and mechanical aspects and the experimental values are similar to that presented from old newspaper. Just as the composites manufactured had their specific mass determined, which resulted in an increase in the average value of the specific mass of the composites with insertion of red mud and kaolin residues. In the case of composites reinforced with fibers of jute and mallow, there was a reduction in the average value when compared to the matrix. Tensile and shear properties were observed for the composites with industrial waste, red mud and kaolin. The composite 5RC exhibited tensile strength value closer to the matrix, as well as for 5RLV, 10RLV and 15 RLV which exhibited the same behavior. For shear strength the composites 10RLV and 15 RLV were closer to the matrix. As well as the composites reinforced with jute fibers 0° presented the highest tensile strength were 0J5, 0J15 and 0J25, exceeding in 2%, 150% and 166% the tensile strength of polyester. For the composites reinforced with mallow fibers 0° showed the highest tensile strength were 0M15 and 0M25, exceeding in 67% and 96% the tensile strength of polyester. For shear strength the composites reinforced with jute (0J15 and 0J25) and mallow (0M15 and 0M25) fibers exceeded the matrix in 201%, 206%, 71% and 144%, respectively. The tensile strength of the three-phase composites (0JRLV, 0JRC, 0MRLV and 0MRC) exceeded the matrix by 129|%, 100%, 54% and 21%, respectively. For shear strength they exceeded the matrix by 49%, 47%, 63% and 52%. Composites with 0-aligned fibers showed satisfactory mechanical behavior for application in composite materials presenting reinforcement characteristics.
Acesso aberto (Open Access)
Estudo da influência de resíduos gerados pela indústria de mineração nas propriedades de compósitos de matriz poliéster reforçados com fibras naturais
(Universidade Federal do Pará, 2016-02-26) COSTA, Deibson Silva da; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
In this work, it was produced pure isophthalic unsaturated polyester matrix boards, composites with vegetable fibers (sisal, mauve and jute), composites with industrial waste (red mud, kaolin and ash) and hybrid composites with fibers and waste. The residues were used with a particle size less than 100 mesh and in fiber lengths of 15 mm arranged randomly within the matrix. The fibers were characterized considering their physical, mechanical and morphological properties. The composites were manufactured by a manual process called (hand lay-up) in the form of rectangular plates in metal and pressed mold. The proportions of the mass fractions of waste have varied by 10 % until saturation within the matrix, the mass fraction of fibers was fixed at 5 %. The composites were characterized physically (porosity, water absorption and bulk density), mechanically (tensile, bending and impact), thermally (thermogravimetry - TGA), mineralogically (diffraction of rays-X - DRX), flame retardance and morphologically (scanning electron microscopy - SEM). It was found with the insertion of waste and fibers in the composites, an increase of its physical, mechanical, thermal properties and flame resistance. The physical properties of porosity, water absorption and bulk density has increased significantly (6,7 % to 33 %) with the addition of constituents (residues and fibers). There was an increase (15 % to 95 %) in mechanical strength (tensile, bending and impact) of fiber composites and waste (10 %) composites with fibers. It was evident an improvement in thermal stability (10 % to 50 %) of composites with inclusion of waste. Only the red mud composites have presented a flame retardant ability, obtaining V-2 classification according to UL-94 standard. Morphological analysis of fracture surfaces was efficient in identifying the failure mechanisms and features present in the material. The composites manufactured in this study have resulted in materials with good properties, which makes them feasible candidates for certain types of applications such as panels, liners, partitions and internal doors, an inner lining of automobiles, residential rails and other applications of this nature, respecting the characteristics of these materials.
Acesso aberto (Open Access)
Forest deforestation in the Brazilian Amazon states and its impacts on natural resources: construction of statistical-econometric panel model for 2000-2018
(Universidade Federal de Campina Grande, 2020) CARVALHO, André Cutrim; CARVALHO, David Ferreira; AIRES, Alana Paula de Araújo
In Brazil, deforestation in the Amazon is the main factor which is responsible for the destruction of natural resources and environment degradation. Economic growth and improving income distribution, for example, contribute to an increased demand for land and to the expansion of livestock production. Thus, in order to analyze the effects of economic growth and income distribution on natural resources, first it is necessary to distinguish the dynamics of the economic growth (whether slow or accelerated); and second, it is essential to know the form in which economic growth is taking place: whether through the extensive absorption of using factors of production; or whether through intense absorption with an increase in the productivity of the factors of production due to technical innovations; and third, the fact that the economy grows in a finite ecosystem implies an increase in opportunity costs. The effect of deforestation ultimately affects economic productivity and also provokes other ecological and socioeconomic disruptions. The aim of this paper is to analyze the impact of deforestation on the natural resources of the area known as Legal Amazon, during the period 2000-2018. For this, statistical-econometric instruments from panel modeling have been used. The central conclusion is that the main regressors associated with the rate of deforestation in the surveyed states continue to be the significant causes of this problem throughout the region. Thus, it is assumed that deforestation in the Amazon is, in fact, the main factor responsible for the destruction of natural resources. However, it cannot be denied that extensive livestock production continues to be the main activity responsible for the significant increase in deforestation in the region.
Acesso aberto (Open Access)
Gestão de recursos naturais na Amazônia: a reseva extrativista mãe grande de Curuça-PA
(Universidade Federal do Pará, 2013-04) SOUZA, Charles Benedito Gemaque
The perspective of the development sustainable appears the inclusion possibility of those that historically were á margin of the plans implanted in the Amazon. In that context, the management of the natural resources in the area i being delineated starting from the creation of several models of Units of Conservation, purpose in the Reserve Extractiviste an innovative instrument of warranty of constitutional rights on the environment. With base in those presuppositions, the field research was accomplished in the Reserve Extractiviste Marine Mãe Grande of Curuçá-PA, starting from semi-structured interviews and the direct observation. Whose objective was to analyze the particularities of an experience of development sustainable maid starting from the mobilization and communities’ fight that still survive of the extrativistes and of the handmade fishing in opposition the logic capitalist of economical growth and of modernization of the space.
Acesso aberto (Open Access)
Grandes projetos e a relação com os recursos naturais na fronteira amazônica: os acordos de pesca como instrumentos moderadores de conflitos em Limoeiro do Ajuru
(Instituto Histórico e Geográfico do Pará, 2021-06) RODRIGUES, Suzi Carolina Moraes; CARVALHO, André Cutrim; SILVA, Fernanda Kelly Valente da
Since the 1960s, the Brazilian Amazon has suffered from several territorial transformations, an immediate result of the process of institutional integration and federalization by the military regime. The impacts caused by this development model, based on large enterprises, fell upon the social environment, directly affecting local populations and traditional peoples, as well as on the environment, by causing a series of irretrievable damage to the region's natural resources. The implementation and operation of these large projects on the frontier of the Brazilian Amazon, however, began to present a territorial dynamic marked by intense conflicts, particularly in the state of Pará. Fishing resources make up a considerable part of natural resources, which were considerably impaired by the large mining and hydroelectric projects, causing pollution of the water bodies, the silting of rivers and a decrease in fishing stocks, considered the main food-economic source of these traditional communities. It is in this perspective that the fisheries agreements emerged, acting as empowering instruments for the fishing communities and conflict moderators in the fishing territories. The fundamental objective of this article, therefore, is to understand how fisheries agreements may act in moderating conflicts over fishing resources, resulting from the implementation of large enterprises, seeking to assess the repercussions of this in the municipality of Limoeiro do Ajuru in the state of Pará. The main conclusion is that the fisheries agreements are capable of acting in the governance of the territory by strengthening a series of actions within the scope of sustainable management of fishing resources and local development in its social, economic and environmental aspects.
Acesso aberto (Open Access)
Manejo e uso comum dos recursos naturais em populações quilombolas no vale do Rio Capim - PA
(Núcleo de Altos Estudos Amazônicos, 2010-07) BARBOSA, Maria Betanha Cardoso; ACEVEDO MARIN, Rosa Elizabeth
This text outlines the system of common use of natural resources in quilombola communities of Taperinha, Sauá-Mirim and Nova Ipixuna. Situated in the southeastern of the São Domingos do Capim city. The communities are located in the most deforested area of the Capim River bank. According to the memory of the elderly, in the abundance of natural resources, the community handled without rules and norms of use. However, in times of scarcity, it was necessary to elaborate arrangements in order to sort the management of resources, to keep them. These rules and standards exist as management mechanisms within the territory of the community, which become incorporated by the families, by the awakening of the feeling of belonging, governed by strategies of use and survival. Thus, the use derives from an ancestry that defines spaces for gathering, hunting, farming, etc..The standards and rules emerge according to the notion of territory established by the group, giving freedom to the ones who can access resources and at the same time, imposing rules to its utilization.
Acesso aberto (Open Access)
Metodologia para avaliação do grau de sustentabilidade utilizando a lógica fuzzy: aplicação na indústria madeireira
(Universidade Federal do Pará, 2012-05) LEAL, Maria de Fatima Mendes; MONTENEGRO, André Augusto Azevedo; http://lattes.cnpq.br/1135221873341973; MANESCHY, Carlos Edilson de Almeida; http://lattes.cnpq.br/3638082762153871
The economic needs of industries as well as the necessity of preservation of the environment require a development of its activities in a way that is environmentally responsible and, consequently, with the proper use of natural resources. The economy of the state of Pará is based on agriculture, livestock and vegetable and mineral extraction being the last one represented, mainly by wood. Certainly, it will contribute to the sustainable use of forest resources, an assessment that quantifies the subsystems environmental, economic and social, that are the basis of sustainability. Studying the segment of improvement and exportation of wood it was used fuzzy logic in a proposed methodology for determining the degree of sustainability that, in this study, may vary on a scale from 0 to 10, quantifying not only the condition of sustainability itself, but also indicating which subsystems or components need to be improved. The determination of public policy for the forestry sector can be performed using the same methodology, since that the necessary legal adjustments are made.
Acesso aberto (Open Access)
Obtenção e caracterização da raiz pulverizada da espécie entada polyphylla benth visando aplicação tecnológica em produto sapônico bioecológico
(Universidade Federal do Pará, 2024-12-09) JESUS, Mário Lucivaldo Barreto de; BRASIL, Davi do Socorro Barros; http://lattes.cnpq.br/0931007460545219; HTTPS://ORCID.ORG/0000-0002-1461-7306; ALVES, Cláudio Nahum; http://lattes.cnpq.br/8315600067791313; https://orcid.org/0000-0001-6576-4229
This study focuses on the physicochemical characterization of the pulverized roots of Entada polyphylla Benth, commonly known as gipioca, aiming at its application in the development of a bioecological soap product, the “vegetable soap.” This Amazonian species is rich in saponins, compounds with bioactive properties including antioxidant, surfactant, and emulsifying actions, as well as cytotoxic potential. Samples were collected from three locations in the municipality of Acará, Pará, identified at the Embrapa herbarium (NID 51/2023), and subjected to physicochemical and biological analyses. Results revealed 75.92% antioxidant compounds, 17.26% total saponins, 20.32% moisture, and 12.28% tannins, highlighting the plant's potential as a source of amphiphilic and bioactive compounds. Saponin extraction was performed via sustainable water maceration, avoiding the use of harmful chemical solvents. Laboratory tests demonstrated that the pulverized material generates significant foam upon contact with water, confirming its surfactant properties and suitability for cleaning applications. The developed product was patented (BR 102024016942 5) and presented at scientific events, such as the SBPC, where it was recognized for its innovation and alignment with circular economy principles. The study also assessed the biological activity of saponins through cytotoxicity assays on tumor cell lines (AGP01, A-549, SK-MEL 19) and a non-neoplastic cell line (MRC5). Results indicated selective cytotoxicity against tumor cells, emphasizing the therapeutic potential of the extract. In addition to promoting sustainable technological solutions, the study contributes to the valorization of regional biodiversity and offers socioeconomic benefits to riverside communities, including job creation and income generation through sustainable resource management. This research expands the understanding of Amazonian legumes’ chemistry, particularly the bioactive properties of saponins, and underscores their potential as substitutes for synthetic surfactants in industries such as cosmetics, therapeutic products, and cleaning agents. It is concluded that Entada polyphylla is a promising source of natural bioactives, with technological applications that integrate innovation, socioeconomic development, and environmental preservation.
Acesso aberto (Open Access)
Obtenção e caracterização de ligas de ouro aplicadas ao setor joalheiro no estado do Pará
(Universidade Federal do Pará, 2014-06) MAIA, Raimunda Figueiredo da Silva; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968; SÁ, Fernando Antonio de; http://lattes.cnpq.br/8275621144223544
Gold has main application as adornment in jewelry pieces but in its pure state doesn’t have the hardness required for this use, being generally fused with other metals to form alloys. The aim of this research was to elaborate and characterize optical, structural and mechanical properties of gold alloys and introduce the use of intermetallic Au-20% Al, seeking to improve the production of jewelry industry. Four (4) gold alloys were prepared: one (1) intermetallic Au-20% Al violet colored and three (3) with usual coloration in jewelry manufacture (Au-25% Ag - light green, Au-12,5% Cu - red, Au-12,5% Ag-12,5% Cu - yellow). Au-20% Al alloy was produced in microproducers of the state of Pará workshops, while the others were fused in Materials Laboratory of Chemical Engineering School in Federal University of Pará (UFPA). The structural properties were analyzed by optical microscopy (OM) and scanning electron microscopy (SEM). The results revealed dendritic cell structure for Au-25% Ag and Au-12,5% Cu alloys, dendritic structure for Au-12,5% Ag-12,5% Cu alloy and cellular structure for Au-20% Al alloy. The mechanical properties were obtained through Vickers microhardness tests, evidencing the highest hardness for Au-20% Al alloy, intermetallic of AX2 type. The optical properties evaluated by colorimetric tests showed visible light spectrum in the range from violet color (Au-20% Al), greenish yellow (Au-25% Ag), red (Au-12,5% Cu) and yellow (Au-12,5% Ag-12,5% Cu).
Acesso aberto (Open Access)
Relação entre recursos naturais, identidades tradicionais e línguas na Amazônia brasileira
(Universidade Federal do Pará, 2021-06) GOMES, Edson de Freitas
The aim of this article is to present and discuss some of the reasons that have caused the progressive loss of a significant portion of natural in Brazil, especially in the brazilian Amazon, and the consequences of this loss for the maintenance of the traditional people’s way of life in relation to their territories, their identities, and their languages, with emphasis on indigenous people who are one of the most responsible for nature conservation. The data comes from websites scientific articles and in the case of the linguistic data, from the author’s fieldwork. It was concluded that the progress promised with the exploitation of the natural resources of the Amazon, was not satisfactory for the great majority of the Brazilian population, especially the traditional populations.
Acesso aberto (Open Access)
As repercussões socioterritoriais da atividade de mineração no município de Barcarena estado do Pará
(Universidade Federal do Pará, 2022-03-31) CHAGAS, Simone Franceska Pinheiro das; SILVA, João Márcio Palheta da; http://lattes.cnpq.br/5356047514671129; https://orcid.org/0000-0003-0354-4639
: Our objective in this article is to analyze from the perspective of geography the debate that brings the New Mining Code (NCM). Our purpose is to critically reflect on the roleof mining within the Brazilian geographic space, where mining territories have different degrees of socio-environmental processes and conflicts. The central idea is to analyze the production model that exploits mineral resources on land use planning, and thus further instigatethe debate that has been made by society to think of another mining code, which in fact is sovereign and guarantees the Brazilian society the appropriation of wealth and the debate aboutwhat we want! What are our real interests? What does it mean to choose a type of economic exploitation that disregards society and its real interests? It implies the new mining code to interfere in the territories and impose a perverse deterritorialization on the interests of Braziliansociety, a savage territoriality. What is at stake in the new mining code by weakening the powerof the state to regulate mineral goods and to increase revenue, disregarding the real interests ofBrazilian society? These are essential issues in the debate about the use of territory, which we seek to analyze in this article.
Acesso aberto (Open Access)
Sustentabilidade Organizacional: percepção de práticas sustentáveis nos ambientes de trabalho remoto e presencial entre os servidores Técnico-Administrativos em Educação do Instituto de Ciências Exatas e Naturais da UFPA
(Universidade Federal do Pará, 2023-02-10) BEZERRA, Thiago de Matos; OLIVEIRA, Edivaldo Herculano Correa de; http://lattes.cnpq.br/0094007714707651; https://orcid.org/0000-0001-6315-3352
Discussions on better use of natural resources and the global event of the COVID-19 pandemic have contributed to the expansion of changes in ways of working, so that organizations have had to adapt. In this context, there has been an expansion of remote work. In this way, a case study was carried out, with the aim of understanding how we arrived at sustainability practices in the work environment, in remote and face-to-face modalities. This is a cross-sectional study, of a descriptive nature, with pending information from a questionnaire with questions with open and closed answers, which was carried out among the load servers belonging to the career of the TechnicianAdministrative in Education, who work at the Instituto of Exact and Natural Sciences at the Federal University of Pará. The results indicated some awareness on the part of the public servants regarding this topic, regarding the similarity between the responses received in each modality, and indicated the need for the institution to continue to invest in the implementation of sustainability practices.