Navegando por Assunto "Paragominas - PA"
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Item Acesso aberto (Open Access) Albedo da cultura da soja em área de avanço da fronteira agrícola na Amazônia(2010-01) SOUZA, Paulo Jorge de Oliveira Ponte de; RIBEIRO, Aristides; ROCHA, Edson José Paulino da; LOUREIRO, Renata Silva de; BISPO, Carlos José Capela; SOUSA, Adriano Marlisom Leão deSoybean expansion in the Amazon has been increasing considerably in recent years, the consequences of which can be serious environmental impacts. In this paper the soybean albedo (Glycine Max (L.) Merryl) was evaluated, which was planted in natural field conditions in Paragominas city (PA), a region representative of agricultural expansion in Amazon. A direct relationship was observed between soybean albedo and its leaf area index (LAI), showing a daily maximum value between 0.24 and 0.25 associated to a LAI of 7.17, when soybean has accumulated 1297.62 degree-days. It was found that the most critical phase of the crop, based on change in surface albedo, is the fruitification phase, when albedo shows a maximum mean value of 0.23 (± 0.0007). Empirical models were fitted to simulate the daily variation of the albedo as a function of LAI and soil humidity during the cycle, and to simulate the diurnal variation of the albedo as a function of solar elevation, for each soybean phase.Item Acesso aberto (Open Access) Análise bioeconômica da produção de novilhos precoces de diferentes grupos genéticos terminados em confinamento, em Paragominas, Pará(Universidade Federal do Pará, 2014-08-29) MAIA, Janaina Teles da Silva; DOMINGUES, Felipe Nogueira; http://lattes.cnpq.br/1461187309835749; OAIGEN, Ricardo Pedroso; http://lattes.cnpq.br/8056365542183068The aim of this study was to evaluate the feasibility of a system of early termination of steers, in feedlot from, zootechnical and economic indicators, as well as compare the performance of different genetic groups (crosses with zebu and taurine). The study was conducted on private property in the municipality of Paragominas, Pará, which were used in the experiment the animals own production system, randomly selected from three genetic groups: Nellore, ½Angus ½Nellore e ½Charolais ½Nellore, but with date of birth and approximate weight, ie, the same contemporary group. The experiment was conducted in 2012 and 2013 with animals from birth, 2010 (67 animals) and 2011 (63 animals), respectively, all with an average age of 21 months at the beginning of feedlot season. To evaluate the production performance animals were weighed every 28 days, following a solids fasting period of 16h. Each week samples of concentrated feed, silage, and total diet (silage + concentrate) for analysis bromatological were collected. Economic data were collected on the property, and tabulated and analyzed in MS Excel. The results showed especially the animals crossing ½Charolais ½Nellore as the medium of performance indicators, statistically not differing in some aspects from the crossing ½Angus ½Nellore junction, but always with higher values. As for economic data showed positive indicators feedlot for two years of the experiment, with profitability and average return of 8.5% and 9%, respectively, highlighting the genetic group ½Charolais ½Nellore, as the most profitable, due to higher carcass yield.Item Acesso aberto (Open Access) Análise da susceptibilidade a inundações na bacia hidrográfica do Rio Uraim, Paragominas - PA(Universidade Federal do Pará, 2017) CORREA, Denison Lima; MATTA, Milton Antônio da Silva; http://lattes.cnpq.br/9053359402276755The phenomenon of flooding is a natural event, given by the extravasation of water to the greater river bed, a fact caused by intense precipitation causing the amount of water that arrives simultaneously to a point of the river is greater than its capacity of flow. The main objective of this dissertation was to analyze the susceptibility to floods in the Uraim River basin in the municipality of Paragominas state of Pará, based on the physical and morphometric characteristics of the basin and to evaluate the areas most prone to flooding within the urban zone. Geoprocessing techniques were used to extract the basin by SRTM images and to use digital image classification to obtain soil use in the basin and extraction of elevation and slope to compose the map algebra process by the AHP method in order to generate the map susceptibility of the basin and conduct a discussion with the urban area of the municipality of Paragominas. The Uraim River basin It has a drainage network with area and perimeter of 4,981 km² and 202 km, respectively. The basin has a maximum altitude of 255 meters and a minimum of 1 meter in the exudation, the average altitude being 136 meters. The slope of the main watercourse calculated on the basis of the extremes (S1) showed a value of 0.08 m/m expressed a value that overestimates the mean slope of the water course, and hence the peak flood. For the variable use and occupation of the soil present variables where it can be analyzed that the Uraim river basin is in the process of altering its vegetation cover, evidencing a high index in the pasture and agriculture classes, besides the deforestation in Permanent Preservation areas, the areas evidence of high impermeability in the preservation areas. It can be seen that the neighborhoods most susceptible to flooding are in regions near the river basins of the basin: Promissão, Uraim, Cidelândia, Angelim and Cidade Nova. The AHP technique used to determine the weights of classes contributing to flood susceptibility was effective because it reduces and simplifies the proposed problem, which minimizes the errors of judgment during the process.Item Acesso aberto (Open Access) Análise mineralógica por difratometria de raios-X e método de análise de agrupamento (cluster analysis) como critério para individualização de horizontes bauxíticos(Universidade Federal do Pará, 2017-03-08) OLIVEIRA, Kelly Silva; ANGÉLICA, Rômulo Simões; http://lattes.cnpq.br/7501959623721607The formation of wide profile of alteration like as bauxitic deposits on Amazon during Cenozoic period is resultant of intense intemperism caused by seasonal climate, elevated temperature and humidity that are characteristics this region. The bauxitic Province of Paragominas, localized in the east portion the state Pará and west portion of Maranhão, occupies 50,000 km2 approximately forming the largest group of bauxite of Brazil. This work was used X-ray diffractometry, a technique that requires little analysis time, minimum pretreatment steps and small sample amounts, associated with cluster analysis for identify and group samples of same horizon of bauxitic profile of the mine Miltonia 3, Paragominas-PA. The results obtain were correlated with chemical analysis, frequently used for quality control and processing of bauxites. The samples used in this work and your chemical analysis were made available for company Norsk Hydro. The mineralogical types of ore were initially defined through clusters analysis of the XRD patterns of two sections (HIJ-229 e HIJ-231) from polling mesh, with 23 holes each section, and with 375 samples analyzed in all. Based on peak position and intensity of the pattern XRD was possible discern the bauxitics horizons. Due the mineralogic similarity this horizon, the differences found in this group refer principals proportions of minerals constituents: Gibbsite, kaolinite, goethite, hematite, and, more rarely, quartz and anatase. Thought clusters analyses was possible to separate by group a set of similar samples, besides facilitate the analysis of many samples quickly and with efficient results. It was possible yet observe a good correlation of the clusters with the lithotypes identified by the company Norsk Hydro through the results of the chemical analysis. In this way, the analysis of clusters in diffractograms of samples of aluminum ore can be an efficient tool aiding in the protocols of processing of this material.Item Acesso aberto (Open Access) Avaliação da exploração florestal de impacto reduzido em atributos físicos e químicos do solo e na regeneração natural em Paragominas, PA(Universidade Federal do Pará, 2008) HIRAI, Eliana Harumi; SILVA, José Natalino Macedo; http://lattes.cnpq.br/0479038232182214; CARVALHO, Cláudio José Reis de; http://lattes.cnpq.br/5976057799163293This work was carried out at Fazenda Rio Capim, property of the Cikel Brasil Verde Madeiras Ltda., in the municipality of Paragominas, State of Pará, Brazil. The main objective was to study the effect of logging on the physical and chemical properties of the soil and on natural regeneration in three Working Units logged in 2000, 2003 and 2006., The treatments were gap center, primary and secondary skid trails, logging landing and one control plot. The diameter of each individual was measured at approximately 1,30 m of the ground; all species were identified and calculated the species richness, abundance, diversity Index, evenness and floristic similarity. Samples of litterfall were collected in same the locations of soil plots. For physical analysis (granulometry, texture, soil bulk density, resistance to the penetration, porosity and volumetric humidity) soil samples were collected at 0-5, 5-10, 10-20, 20-30 cm depth, and for the chemical analysis (pH, carbon stock and nitrogen, C/N) the samples were at 0-10 cm depth. In the primary skid trails it was considered its beginning, middle and end of the extension, and both for primary and secondary skid trails, the marks of the wheels of the machinery (RM), the place between the wheels (ER), and the edges of the trail (BT). Felling gaps were randomly measured and classified with areas <600m2 and> 600m2. The soil of the study areas is Yellow Latosol with very clay texture. The soil bulk density and porosity varied significantly among years and between treatments (p <0,001); no significant differences were found at 20-30 cm depth. Main and secondary skid trails and logging landings were the most affected treatments. Gaps had no influence on bulk density. It was verified that ER and BT did not differ statistically. The comparison among beginning, middle and end of the skid trails showed ere no significant differences for any of the comparisons. Results for to resistance to penetration were very similar to the bulk density and porosity. Volumetric humidity varied according to the combination year x treatment (p <0,001). Average pH values varied between 4,72 to 5,92. Litterfall decreased as time elapsed since logging. Average contents of C varied between 25,94 to 42,59 g.kg-1 and the contents of N between 2,23 to 3,35 g.kg-1, both considered as high values. For carbon stock of (Mg.ha-1) it was not found significant difference for any of the interactions (year, season and treatment). The relationship C/N for logged forest showed values between 10,37 and 15,42, indicating mineralization of the soil inorganic nitrogen. The three studied WUs presented high diversity and evenness. WUs logged in 2000 and 2003 showed the highest similarity (35,93%), followed by the WUs logged in in 2003 and 2006 (33,46%), and WUs logged in 2000 and 2006 (26,93%). It has been concluded that it is necessary a long observation period for evaluation of the effects of soil compaction on the growth of the regeneration. Indicators for good forest management practices should consider soil attributes (physical, chemical and biological) for a better understanding of the system and choice of other indicators that can give answers on the equilibrium of the forest ecosystem. The studied parameters can be used as indicators of environmental quality.Item Acesso aberto (Open Access) Avaliação da viabilidade da legislação ambiental para o pequeno produtor rural no Estado do Pará(Universidade Federal do Pará, 2011) CUNHA, Helen Theyla Costa da; ALMEIDA, Oriana Trindade de; http://lattes.cnpq.br/0325909843645279Item Acesso aberto (Open Access) Avaliação das comunidades de formigas em uma área de extração madeireira(Universidade Federal do Pará, 1999-07-30) KETELHUT, Suzana Maria; HARADA, Ana Yoshi; http://lattes.cnpq.br/4410204692155098This work presents a comparative study of ant fauna communities inhabiting in a primary tropical forest and two types of logging systems (Managed and Traditional) located in Paragominas, PA, Brazil. From each area, ants were sampled using pitfall traps (Majer & Delabie 1994) in six 200m transects separated from each other by 100m. Differences in ant fauna diversity in the three forest types were tested using índices of diversity (Shannon, Simpson and Fisher's Alpha) and richness estimates protocols (Colwell Coddington 1994). Species composition was evaluated through affinity analysis (Scheiner 1992) and indices of similarity (jaccard and Morisita-Horn). A total of 134 ant species belonging to seven subfamilies and 42 genera were identified in the entire area. From these, 90 species were found in Primary Forest, 90 in Managed logged forest and 84 in the Traditional logged Forest. Differences between habitats could be detected by comparing diversity and similarity indices in different transects/habitats. There were no differences in índices when absolute values were compared for each habitat. Results from richness estimate protocols indicate that ant fauna was similar between habitats and suggests that ant fauna diversity was underestimated. Periodic variations on pluviosity had a strong effect on diversity and richness estimates in the three forest types. The ant fauna composition was similar between habitats; however, a high mosaic diversity could be detected by using affinity analysis, suggesting that the ant community is composed of complex gradients. Thus differences in ant composition would be detectable at smaller scales.Item Acesso aberto (Open Access) Avaliação dos efeitos da mata ciliar sobres os fluxos hidrogeoquímicos em área de pastagem: caso das bacias hidrográficas dos igarapés do Sete e Pajeú - Paragominas (PA)(Universidade Federal do Pará, 2006-09-22) SARDINHA, Aline Souza; SOUZA, Eliene Lopes de; http://lattes.cnpq.br/2060516413833723It was studied the waters of uncofined aquifer and of portions of superficial drainage in the wartersheds of the Sete and the Pajeú rivers, in the municipal district of Paragominas, in the northeast of Pará. With total areas of around 150 and 45 Km2, respectively, those basins are mainly occupied by cattle areas. They are inserted in the sedimentary basin of Grajaú, occurring from the base to the top the Itapecuru formation, Ipixuna formation, Debris-Lateritic Paleogenic covering, Pleistocenic Sedimentary Covering and Alluvial Deposits. The chemistry of the water was evaluated in pasture areas, with and without preservation of the riparian forest that, although protected by law, is usually removed for several land uses. The waters of 9 monitoring wells were studied, installed in uncofined aquifer, and of 13 portions of superficial drainage placed in pasture areas and in riparian forest. The evaluated aquifer is constituted by sediments of the Ipixuna Formation, with kaolinite sandstones and mudstone kaulinic. Eight sampling campaigns were accomplished, during the dry and rainy periods in 2005. It was determined the contents of sodium, potassium, calcium, magnesium, nitrate, ammonium, sulfate, phosphate, bicarbonate and chloride, and in the Field pH, electrical conductivity, and temperature. In the waters of superficial drainage, the results indicate significant leaching of soils, evidenced by the higher the contents of nutrients. In the waters of superficial drainage concentrations of sulfate, potassium, magnesium and chloride were higher in the pasture areas. On the other hand, the contents of ammonium, nitrate, phosphate, calcium, sodium and bicarbonate were, in most case higher in an area of riparian forest, in which the main source of nutrients for the waters is the organic matter of the soil. I pastures these elements come from the either the limestone or the fertilizers used for pH correction and increasing of the soil fertility. Another source comes from the contribution of ashes, resulting from burning used to convert the original vegetation in pasture. In the freatic water, the contents of the cations and anions evaluated were, in general, higher in the pasture areas, except for the concentrations of sodium and chloride that were larger in the wells in riparian forest. Among the constituents analyzed, stood out, mainly, the concentrations of ammonium and bicarbonate, whose maximum values obtained in wells in riparian forest and pasture were, respectively, 0,81 and 17,6 mg.L-1 (ammonium) and 15,98 and 109,78 mg.L-1 (bicarbonate). When compared to the water of superficial drainage, it was verified that in the freatic waters most of the substances showed an increase in their contents in pasture areas. That 4 result is attributed to the fixation of nutrients by the riparian forest when the percolating water crosses the insaturated zone, while in the pastures the nutrients can reach the water table, once in those areas a significant retention of those substances does not happen. Most of the cations and anions analyzed showed higher concentrations in the wells of the point ST6, in the Sete river, where the area is of pasture and without riparian forest. The ions with higher contents were nitrate, ammonium and bicarbonate obtained in the dry period. For the alkalinity, pH and CE values were higher in pasture areas in the freatic waters. On the other hand, in the waters of superficial drainage, except for the pH, those parameters showed the highest values in the areas of riparian forest. Acid waters prevailed with pH between 5 and 6, although values close and even superior to 7 were obtained, attributed to the limestone used in the area and to the ashes, rich in bases, coming from the burning. In relation to the temperature, it was verified that it reflects the local average, 26,33oC. In the Pajeú watershed, the cation and anion contents were, in general, higher during the rainy period, while in the point ST6 in the basin of the Sete there was a relative increase in the contents of most of the ions analyzed during the dry period, due to the lowering of the water table and the low recharge of the aquifer. In the areas with riparian forest that effect was neglectable due to the small variations in the hydrological conditions along the year, resulting into a smaller annual variation in the depth of the water table.Item Acesso aberto (Open Access) Balanço de água em área de cultivo de soja no Leste da Amazônia(Universidade Federal do Pará, 2007) BISPO, Carlos José Capela; RIBEIRO, Aristides; http://lattes.cnpq.br/8652338930029697; ROCHA, Edson José Paulino da; http://lattes.cnpq.br/2313369423727020The expansion of the agricultural frontier, driven mainly by soy cultivation (Glycine max (L) Merrill), covers a large regional extent and is highly important to understanding the changing face of Amazonia. A field observation experiment was established to study water balance components of the soy agriculture ecosystem and analyze the impact of the water balance associated with forest conversion. The experiment also evaluated the crop’s need for water according to its development phase. For the water balance study, the BRS Candeia cultivar was used along with its respective phenological phases. The experiment measured soil water storage, precipitation, plant cover water interception, superficial drainage of soil water, evapotranspiration (Etc), and water content retained by the soy plant. Water infiltration in the soil was also measured. Interception and superficial drainage were 45,9% and 1% of the precipitation, respectively. The greatest evapotranspiration occurred during the flowering phase (R1-R2) with a gradual decline in values until crop harvest and a cycle average of 3,80mm.day-1, which was very similar to that found in forest. The period between the vegetative phase (V) and fruiting (R3-R4) was when the plant presents the greatest percentage of water, declining gradually during the grain-forming phase (R5). Overall, no water deficiency occured in the mean soil water balance. Precipitation was greater than the amount necessary to compensate for evapotranspiration and supply adequate water storage, creating a surplus of water in the soil.Item Acesso aberto (Open Access) Características agrometeorológicas da cultura de soja (Glycine max (L.) Merrill) variedade Candeias em Paragominas – PA(Universidade Federal do Pará, 2008-01-31) SANTOS, Ana Patrícia Ramos Araújo dos; RIBEIRO, João Batista Miranda; http://lattes.cnpq.br/1874829087396349The local authority of Paragominas belongs to the South-east Mesorregião from Pará (03 ° 00 ' 00 ” S and 47 ° 21 ' 30 " W) where there is the whole area already altered for deforestation and pastures only waiting for being incorporated to the productive agricultural process. The culture of the soy has significant importance for the national economy, being one of the principal agricultural produce of export and generation of emblems, pertaining to the family of the leguminous plants, is adapted in a spacious belt of climates, being able to be cultivated in all the types of ground. The objective of this study is to value the conditions agrometeorológicas during the vegetative cycle of the soy at Paragominas - PA. In this area there was built a meteorological automatic tower of 4 meters of height, being the farm white Ox located to 03°02 ´ 15 " S and 47°17 ´ 56 " W and when a station was installed with measures to each (5) five minutes of the next variables: temperature of the air (Tar), specific moisture of the air (q), temperature of the ground (Tsolo), moisture of the ground (Usolo), speed of the wind (W), direction of the wind (D), solar radiation incident (Sin), solar radiation reflected (Sout), balance of radiation (Rn) and flow of heat in the ground (G) and Haste. Microclimatic variations have quite straight effects in the development of the plant. The collections when the beginning of June of 2006 was carried out between February show that the days 84, 98 and 126 were the days of bigger haste and the days 70 and 154 and 161 there was no rain. In accordance with the development of the planting we notice that in the February the beginning of April on the very specific moisture of the air maintained elevated 21,0 g/Kg. The journey of the temperature the maxim of the air was maintained between 23,5 ºC and 32,5 ºC accompanying the development of the culture. The middle temperature of the ground in three measures (5, 10 and 20 cm), noticed to itself that the temperatures are between 25 ºC to 35 ºC. In the beginning of the planting the speed of the wind was about 3 m/s decreasing, and in the end of the cultivation 2,5 was m/s. In the period of blooming the speed was maintained stable what contributes to the dispersal of pollen and seeds. The wind comes from all the directions, meantime, the wind is predominant of northeast. When the ground is still completely naked, the albedo is lifted up, since the radiation that enters in the system is same that it goes out. When the albedo begins to develop the planting it has a tendency to lessen, since the quantity of solar radiation that reaches the system part is reflected and other one absorbed by the surface. The middle moisture of the ground in three measures (10, 20 and 30 cm), where we notice that the moisture is between 0,2 m⁄m to 0,45 m⁄m. The flow of heat in the ground to 10 cm presented peaks around-135 W/m2 and 55 W/m2 (7 the 18 h) and to 20 cm he presented peaks around-25 W/m2 and 45 W/m2 (7 the 18 h). The positive sign represents transfer of heat of the air for the ground and the flow was of the surface for the most internal layers of the ground. When we analyse the appreciated evapotranspiration we notice what was inferior of what the evapotranspiration when 4,0 mm⁄dia was appreciated and the measured evapotranspiration 8,8 mm⁄dia. When we analyse the linear regression to appreciated evapotranspiration the measured evapotranspiration was lower.Item Acesso aberto (Open Access) Computação urbana - O uso do aplicativo móvel Colab.re como dispositivo de participação social na gestão da cidade de Paragominas-PA(Universidade Federal do Pará, 2018-01-26) CARVALHO, Tarcísio Lemos Monteiro; ROCHA, Gilberto de Miranda; http://lattes.cnpq.br/2436176783315749; BASTOS, Rodolpho Zahluth; http://lattes.cnpq.br/0697476638482653Urbanization has gradually increased over the last four decades, demanding solutions to the many problems in the cities that affect the lives of billions of people in the world, in Brazil and in the Amazon. Urban Computing helps to improve services in the city, consequently people's quality of life. Social participation at the national level is established in the Federal Constitution of Brazil of 1988 and by the Statute of the City (Law 10,257, of July 10, 2001), already in the global sphere, most recently in 2015, Agenda 2030, in the Sustainable Development (ODS), is a requirement for the development of cities. In this way, this work assumes that social participation is a dimension of development and seeks to use the Colab.re mobile application as an innovation device to strengthen decision processes with the promotion of smart cities. Urban Computing and the availability of mobile applications create networks of relationships by innovating the forms of social participation in the way decisions are made in city management. Use of technological development in favor of social participation is substantial in the execution of this research. For this, it was necessary to create a "social social network" between the Paragominas City Hall and society, stimulating social participation. The key challenge was in mobilization in persuading people of the utility of connecting to each other and working together. On the one hand the public power, represented by the health and urban planning departments, and on the other, as a representation of civil society, students from the city's HEIs were invited: UFRA, UEPA, and IFPA. After the workshops that presented the Colab.re to those involved in the research, questionnaires were applied in order to collect quantitative / qualitative opinions of the participants. The result is a communication channel between City Hall and citizens, reaching Paragominas the highest percentage of users in the state of Pará. Thus, Urban Computing and the use of mobile devices certainly generate a "greater" understanding of how specific impacts reflect in the whole city and can help enforce relationships between users. In this sense, the mobile applications can be useful as devices of innovation in the intensification of the experience lived by an individual, in the construction of a shared analysis on the collective challenges in the city of Paragominas-PA. The result as a product is a plan of care for the secretariats on how to handle the information posted on Colab.re.Item Acesso aberto (Open Access) Crescimento de espécies arbóreas em uma floresta natural de terra firme após a colheita de madeira e tratamentos silviculturais, no município de Paragominas, Pará, Brasil(Universidade Federal de Santa Maria, 2015-12) SOUZA, Deivison Venício; CARVALHO, João Olegário Pereira de; MENDES, Fernanda da Silva; MELO, Lia de Oliveira; SILVA, José Natalino Macedo; JARDIM, Fernando Cristóvam da SilvaThis paper deals with the effects of silvicultural treatments on growth rates of a terra firme natural forest after reduced impact logging (RIL). The study was carried out in the Rio Capim Forest Management Unit, which belongs to Cikel Brasil Verde Madeiras Ltda., located in the municipality of Paragominas, PA. The experimental area comprised 500 ha, where five treatments (100 ha each) each with four replications (25 ha each) were established. The replications were randomly distributed in the 500 ha sample area. The following treatments were applied: T1 - RIL + classical liberation thinning (girdling of competing trees) and climber cutting; T2 - RIL + modified liberation thinning (girdling of competing trees) and climber cutting; T3 - RIL + climber cutting; T6 - only RIL; T7 - unlogged forest (control). In the four years of monitoring forest, after logging and silvicultural treatments, T2 and T3 had the highest diameter growth rates. But the four-year period is not enough to suggest the best treatment, based on diameter growth rate, in response to girdling trees and climber cutting. At species level, growth rate varied between treatments and within treatments. In general, the lower diameter growth rates were observed in the unlogged forest.Item Acesso aberto (Open Access) A determinação da cor do município de Paragominas? Pará, pelo método do painel da sustentabilidade(Universidade de São Paulo, 2018-12) MONTEIRO, Hedileno da Silva; FILGUEIRAS, Gisalda Carvalho; CARVALHO, André Cutrim; OLIVEIRA, Luana Isabel Silva de; RAMOS, Francidélia CruzItem Acesso aberto (Open Access) Difração de raios X em minerais de bauxita e análise através de refinamento pelo método de Rietveld(Universidade Federal do Pará, 2011) ERDÓCIA, Félix Anderson Barros; REMÉDIOS, Cláudio Márcio Rocha; http://lattes.cnpq.br/7146076994037490The aluminum metal is obtained from bauxite ore, great industrial importance, consisting of one or more types of aluminum hydroxide plus a mixture of compounds containing silica, iron oxide, titania and aluminosilicates. Because of the variation in the relative concentration of these components in different samples of bauxite, the qualitative and quantitative mineralogy of the ore, has great importance with regard to its technological application, since this is directly related to the content of these components. This work was applied in eight samples of bauxite, extracted from a mine in Paragominas, the process of refining the spectra of X-ray diffraction using the Rietveld method, which were identified and quantified the crystalline phases: gibbsite, kaolinite, goehtita, anatase, quartz and hematite. Carried the refinements of the samples, we found that all had high levels of Gibbsite and Goethite low which gives an excellent type of bauxite to be used in extraction of alumina.Item Acesso aberto (Open Access) Dinâmicas e interrelações a partir da implementação do projeto mina de bauxita em Paragominas – PA: Colônia Oriente e Potiritá(Universidade Federal do Pará, 2010-08-30) AMORIM, Joana Cláudia Aleixo de; ACEVEDO MARIN, Rosa Elizabeth; http://lattes.cnpq.br/0087693866786684This dissertation studies the dynamics and interrelations between the colonies of “Oriente” and “Potiritá” within the frame of the Bauxite Project of Paragominas. The study focuses on the communities around Platô Miltonia 3, where the bauxite exploitation is centered, taking into consideration the area of the mineral pipe system running through the municipality of Paragominas. The study examines the interrelation of private mineral companies, in this case represented by VALE, through the Bauxite Project of Paragominas, with local power represented by the city management council (“prefeitura”) and the communities. The methods used in this analysis are qualitative research and ethnographic method; techniques such as interview scripts and others were also used in order to identify participation characteristics and the meaning of interrelations. Conflict, power and rural community participation were the categories considered in this analysis, in order to learn their meaning within the studied framework. The analysis allowed us to understand how the intervention capacity occurs when facing social problems, claims and wishes. The conclusion leads us to say that participation as citizens and access to information create responsibilities, making individuals responsible for their acts and capable of changing their reality. Particularly, transformations in accordance with social projects which favor their goals.Item Acesso aberto (Open Access) Efeito de aditivos no comportamento reológico do rejeito da bauxita(Universidade Federal do Pará, 2015-03) GONÇALVES, Silvane Gonçalves e; BRUM, Sebastião Martins; FELIPE, Augusta Maria Paulain Ferreira; SOUZA, José Antônio da Silva; FERREIRA, Keylla CastroIn the bauxite mining in Parogominas, PA, Brazil, tailings are discarded in the processing with 33.5% of solids content and small particle size with D50 below 5 µm. These factors contribute to this suspension basically formed by silicoaluminates, with high concentrations of kaolinite clay, increase the viscosity and the yield stress, these factors are important during the pumping. It was performed granulometric analysis and determined the chemical and mineralogical composition of the material. It was studied the use of the sodium hexametaphosphate and polyacrylamide 25% anionic to decrease the viscosity. The result show that the viscosity decrease with use of 23.8 g/ton for the polyacrylamide and 101.75 g/ton for the sodium hexametaphosphate. The particle size and the pH have influence in the behavior of the additives.Item Acesso aberto (Open Access) Estimação volumétrica de resíduos lenhosos de madeira em uma floresta tropical através da Krigagem Ordinária, Paragominas, Estado do Pará(2014-12) SANTOS, Paulo Cerqueira dos; SANTANA, Antônio Cordeiro de; QUEIROZ, Joaquim Carlos Barbosa; BARROS, Paulo Luiz Contente de; SANTANA, Ádamo Lima deThe objective of this paper was to test the application of geo-statistical models to estimate the volume of wood timber residues in a forest area managed in Paragominas, state of Pará. The Warren and Olsen's and Ordinary Kriging methods were used to estimate the volume of forest residues in sampled and not sampled points. The results confirm that the applied methods were appropriate, given that the estimates for the volume of wood timber residues, in the area of study, showed a small difference of 5.2%, when compared to the actual value obtained.Item Acesso aberto (Open Access) Estoques de carbono resultantes de mudanças de uso e cobertura do solo e sua relação com os indicadores socioeconômicos nos municípios de Paragominas e Ulianópolis, Pará(Universidade Federal do Pará, 2016-02-29) SOUSA, Larissa Melo de; LIMA, Aline Maria Meiguins de; http://lattes.cnpq.br/6572852379381594; ADAMI, Marcos; http://lattes.cnpq.br/7484071887086439The land use land cover change are pointed out by several studies to cause environmental damage, such as carbon dioxide (CO2) into the atmosphere The objective of this study is to relate the socio-economic indicators and carbon emissions with the different land use land cover change in the municipalities of Paragominas and Ulianópolis for the years 2004, 2008, 2010 and 2012. For this, they were certain areas according to each class of use and land cover and the mean of the stock of Above Ground Biomass (AGB) for each of the classes of use and land cover provided by TerraClass Project for 2004. Subsequently were quantified CO2 emissions associated with land use land cover change cover. In addition, the socioeconomic data were related to estimates of carbon. The results indicate that much of the forest area was converted to the classes of agriculture and pasture. The total carbon stored above ground, between the period 2004 to 2012 ranged from 163 x106 Mg C to 161 x106 Mg C Mg C in Paragominas and de 31 x106 Mg C to 29 x106 Mg C in Ulianópolis. The net CO2 emissions between the period 2004 to 2012 amounted to 5.8x106 Mg CO2 to Paragominas and 7.4 x106 Mg CO2 to Ulianópolis. In Ulianópolis it was observed a moderete linear relationship between socioeconomic indicators and carbon stocks, while in Paragominas, there was no linear correlation. The conclusion is that the dynamics of use and land cover classes are based on agriculture and livestock as variables in the economic matrix of the municipalities. The carbon stock in the municipalities has decreased due to reduction of forest areas and the advancement of areas of annual agriculture and clean pasture, so the study area is negatively contributing to the removal of CO2 from the atmosphere. Land use land cover change has positive effects on the socio-economic indicators, but increase carbon emissions.Item Acesso aberto (Open Access) Estudo comparativo da toxidez de Palicourea juruana (Rubiaceae) para búfalos e bovinos(2004-03) OLIVEIRA, Carlos Magno Chaves; BARBOSA NETO, José Diomedes; MACÊDO, Raquel Soares Cavaleiro de; BRITO, Marilene de Farias; PEIXOTO, Paulo Fernando de Vargas; TOKARNIA, Carlos Maria Antônio HubingerAn experimental study was performed to establish the toxicity of Palicourea juruana for buffaloes and to add new data on the toxicity of this plant for cattle. The clinical and pathological pictures were similar, but a comparison of the lethal doses for buffaloes (1-2g/kg) and cattle (0.25g/kg) shows that the buffalo is at least 4 times more resistant. In experiments performed 10 years earlier with the fresh leaves - collected on the same farm in July, at the beginning of the dry season, only 2 months later than in this second experimental series - the lethal dose for cattle was 2 g/kg. No explanation was found for the extremely high toxicity of the plant observed in the present study.Item Acesso aberto (Open Access) Gestão ambiental pública na Amazônia brasileira: uma análise de gestão ambiental integrada no estado do Pará(Universidade Federal do Pará, 2013-07-01) SOUZA, Narda Margareth Carvalho Gomes de; PONT VIDAL, Josep; http://lattes.cnpq.br/4415362518177732The study analyzes the public environmental management in the Brazilian Amazon, from the results of the Integrated Environmental Management Project, part of the Pilot Program for the Protection of Tropical Forests in Brazil. Applied in the Amazon region, the project had, as its objective, to develop a model of environmental management in the region, given priority to the institutional capacity of the Secretariats of the Environment, in the technical, logistical and managerial actions with specific technical training, in logistics and participatory planning. This scientific research adopted the Qualitative Method as an inductive strategy with hypotheses, having the municipalities of Santarém and Paragominas, in the State of Pará as the research regions during the 2008-2012 periods. The data was collected through bibliographical documents and investigations, conducting semi-structured research with twenty key interviews for better understanding the project and to organize and evaluate the collected information using a methodological structure based on the Systems Theory, a theory that also apply in this thesis. One of the results of this study was the fact that the PGAI contributed to help the municipalities to define their environmental management system, strengthening and raising their actions, with positive impacts for the appropriate treatment of their natural resources and physical environment, showing, also, the importance of the actions designed for Amazonian municipalities that had planned and used the legal principles of public administration and that was conducted by a transparent and participatory public management, respecting the needs, limitations and potential of the locations, considering the environmental sustainability and the collective interests of the region.