Fishery catches on the Lower Amazon River were analyzed in relation to the hydrological cycle, te... more Fishery catches on the Lower Amazon River were analyzed in relation to the hydrological cycle, temporal shifts in fishing effort, and the use of nets or lines in lakes and rivers. The study was based on a temporal series of catch data collected between January 1993 and June 2011. The variables analyzed were the total catch, use of gillnets or lines, the environment targeted (lakes or rivers), and fishing effort. Temporal trends in the data series were analyzed using the Mann–Kendall test. An Analysis of Covariance (ANCOVA) was used to evaluate whether gillnet and line catches had independent effects on the catch data. Duncan’s test was applied to identify the groups (months) of means that were significantly different from each other. The majority of the catch landings were taken with gillnets (98.65%) in a lake environment (64.98%). The temporal series showed a significant decline over time in the gillnet catches from both lakes and rivers, as well as in fishing effort. The influenc...
In this paper, it was used the Box-Jenkins methodology to assess the historical deforestation dat... more In this paper, it was used the Box-Jenkins methodology to assess the historical deforestation data generated by PRODES in the Brazilian Legal Amazon region from 1988 to 2018, in order to acquire deforestation forecasts. Considering that the model achieved an acceptable performance, forecasts were estimated for the next seven years (2019 to 2023). If there is no significant intervention in the series, deforestation rates are expected to remain ranging from 7,559.97 km2 to 7,730.88 km2, with a mean around 7,625.12 km2. In the case of an intervention, these quantities may vary from 10,429.28 km2 to 28,669.75 km2, with a mean near to 16,766.71 km2, indicating an increase of 119% on deforestation rates. In this sense, this article reinforces the need for maintenance and expansion of the environmental governance structure for the Brazilian Legal Amazon, according to what has happened in the last decade, especially based on the instruments of Command and Control related, for example, to ex...
The objective of this paper was to test the application of geo-statistical models to estimate the... more The 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 Para. 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.
In order to attend the virtual learning environment needs, this paper presents the LSA (Latent Se... more In order to attend the virtual learning environment needs, this paper presents the LSA (Latent Semantic Analysis) application to estimate scores au- tomatically in open ended questions, because still there is not a method with a acceptable accuracy for practical uses. It was developed a model based in LSA composed of six steps: pre-processing, normalization, weighting, singular value decomposition, classification and model fitting. As result obtained a study about the LSA parameters adjustment for practical uses in automatic assessment of discursive responses, and as best result was obtained a accuracy of 87,35%. Resumo. Para atender necessidades dos ambientes virtuais de ensino, este tra- balho apresenta a aplicac ¸ ˜
In order to attend the virtual learning environment needs, this paper presents the LSA (Latent Se... more In order to attend the virtual learning environment needs, this paper presents the LSA (Latent Semantic Analysis) application to estimate scores au- tomatically in open ended questions, because still there is not a method with a acceptable accuracy for practical uses. It was developed a model based in LSA composed of six steps: pre-processing, normalization, weighting, singular value decomposition, classification and model fitting. As result obtained a study about the LSA parameters adjustment for practical uses in automatic assessment of discursive responses, and as best result was obtained a accuracy of 87,35%
Archaeological studies are important for understanding the historical environments and analysis o... more Archaeological studies are important for understanding the historical environments and analysis of the consequences of their changes in the current period, and geophysical methods are an important tool for enabling a low-impact analysis on these. This study evaluated the influence of rainfall in mapping of landscape features of the archaeological site AP-MA-05 using geophysical and geostatistical methods. To obtain the data, the geophysical method of electroresistivity was used in an area of UNIFAP of 10 x 20 meters. The rainfall data were collected in INMET station in Macapá. Data analysis was performed with use of statistical and geostatistical methods. In rainy season, soil resistivity presented a minimum of 198.7 ohm.m and maximum values of up to 3946 ohm.m, with an average of 1188.87 ohm.m. In the less rainy season the observed values were 394 ohm.m (minimum) and 5863 ohm.m (maximum), with an averaging of 2078.31 ohm.m. This demonstrates the influence of rainfall on apparent re...
O objetivo deste trabalho foi caracterizar a evolucao hidroquimica das aguas subterrâneas rasas d... more O objetivo deste trabalho foi caracterizar a evolucao hidroquimica das aguas subterrâneas rasas do aquifero livre do Grupo Barreiras, nas nascentes da microbacia do rio Capitao Pocinho, municipio de Capitao Poco. As aguas sao do tipo bicarbonatadas calcicas e mistas. Com relacao a distribuicao das especies, o cation Ca2+ e o anion HCO3- apresentaram mudancas relevantes entre a epoca chuvosa e seca, indicando alteracoes na qualidade natural das aguas subterrâneas rasas. Os resultados apontam mudancas sazonais na composicao quimica das aguas em decorrencia da variacao do processo de lixiviacao na zona nao saturada.
O presente trabalho apresenta um método simplificado para calibração de curva de descarga, descon... more O presente trabalho apresenta um método simplificado para calibração de curva de descarga, desconsiderando a correção da vazão pela declividade da linha de água e o método do desnível normal. A aplicação deste modelo estatístico, com base na análise de regressão linear à calibração de curva-chave em estação fluviométrica instável, sob efeito de remanso, foi aplicado na Sub-Bacia do rio Tapajós no Posto Fluviométrico de Itaituba, inclusa na Região Hidrográfica Amazônica. Os dados de medições de descargas realizadas em Itaituba e dos níveis fluviométricos do posto de Santarém na confluência dos rios Amazonas/Tapajós, foram obtidos do Banco de dados da Agência Nacional de Águas para a calibração e validação deste modelo proposto. Os índices para avaliar a eficiência do ajustamento da equação calibrada encontrados foram o coeficiente de correlação múltipla (R = 0,9454), coeficiente de Nesh-Sutecliffe (CNS = 0,8938) e do coeficiente de desvio (D= 4,86%). A equação desenvolvida do modelo ...
Fishery catches on the Lower Amazon River were analyzed in relation to the hydrological cycle, te... more Fishery catches on the Lower Amazon River were analyzed in relation to the hydrological cycle, temporal shifts in fishing effort, and the use of nets or lines in lakes and rivers. The study was based on a temporal series of catch data collected between January 1993 and June 2011. The variables analyzed were the total catch, use of gillnets or lines, the environment targeted (lakes or rivers), and fishing effort. Temporal trends in the data series were analyzed using the Mann–Kendall test. An Analysis of Covariance (ANCOVA) was used to evaluate whether gillnet and line catches had independent effects on the catch data. Duncan’s test was applied to identify the groups (months) of means that were significantly different from each other. The majority of the catch landings were taken with gillnets (98.65%) in a lake environment (64.98%). The temporal series showed a significant decline over time in the gillnet catches from both lakes and rivers, as well as in fishing effort. The influenc...
In this paper, it was used the Box-Jenkins methodology to assess the historical deforestation dat... more In this paper, it was used the Box-Jenkins methodology to assess the historical deforestation data generated by PRODES in the Brazilian Legal Amazon region from 1988 to 2018, in order to acquire deforestation forecasts. Considering that the model achieved an acceptable performance, forecasts were estimated for the next seven years (2019 to 2023). If there is no significant intervention in the series, deforestation rates are expected to remain ranging from 7,559.97 km2 to 7,730.88 km2, with a mean around 7,625.12 km2. In the case of an intervention, these quantities may vary from 10,429.28 km2 to 28,669.75 km2, with a mean near to 16,766.71 km2, indicating an increase of 119% on deforestation rates. In this sense, this article reinforces the need for maintenance and expansion of the environmental governance structure for the Brazilian Legal Amazon, according to what has happened in the last decade, especially based on the instruments of Command and Control related, for example, to ex...
The objective of this paper was to test the application of geo-statistical models to estimate the... more The 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 Para. 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.
In order to attend the virtual learning environment needs, this paper presents the LSA (Latent Se... more In order to attend the virtual learning environment needs, this paper presents the LSA (Latent Semantic Analysis) application to estimate scores au- tomatically in open ended questions, because still there is not a method with a acceptable accuracy for practical uses. It was developed a model based in LSA composed of six steps: pre-processing, normalization, weighting, singular value decomposition, classification and model fitting. As result obtained a study about the LSA parameters adjustment for practical uses in automatic assessment of discursive responses, and as best result was obtained a accuracy of 87,35%. Resumo. Para atender necessidades dos ambientes virtuais de ensino, este tra- balho apresenta a aplicac ¸ ˜
In order to attend the virtual learning environment needs, this paper presents the LSA (Latent Se... more In order to attend the virtual learning environment needs, this paper presents the LSA (Latent Semantic Analysis) application to estimate scores au- tomatically in open ended questions, because still there is not a method with a acceptable accuracy for practical uses. It was developed a model based in LSA composed of six steps: pre-processing, normalization, weighting, singular value decomposition, classification and model fitting. As result obtained a study about the LSA parameters adjustment for practical uses in automatic assessment of discursive responses, and as best result was obtained a accuracy of 87,35%
Archaeological studies are important for understanding the historical environments and analysis o... more Archaeological studies are important for understanding the historical environments and analysis of the consequences of their changes in the current period, and geophysical methods are an important tool for enabling a low-impact analysis on these. This study evaluated the influence of rainfall in mapping of landscape features of the archaeological site AP-MA-05 using geophysical and geostatistical methods. To obtain the data, the geophysical method of electroresistivity was used in an area of UNIFAP of 10 x 20 meters. The rainfall data were collected in INMET station in Macapá. Data analysis was performed with use of statistical and geostatistical methods. In rainy season, soil resistivity presented a minimum of 198.7 ohm.m and maximum values of up to 3946 ohm.m, with an average of 1188.87 ohm.m. In the less rainy season the observed values were 394 ohm.m (minimum) and 5863 ohm.m (maximum), with an averaging of 2078.31 ohm.m. This demonstrates the influence of rainfall on apparent re...
O objetivo deste trabalho foi caracterizar a evolucao hidroquimica das aguas subterrâneas rasas d... more O objetivo deste trabalho foi caracterizar a evolucao hidroquimica das aguas subterrâneas rasas do aquifero livre do Grupo Barreiras, nas nascentes da microbacia do rio Capitao Pocinho, municipio de Capitao Poco. As aguas sao do tipo bicarbonatadas calcicas e mistas. Com relacao a distribuicao das especies, o cation Ca2+ e o anion HCO3- apresentaram mudancas relevantes entre a epoca chuvosa e seca, indicando alteracoes na qualidade natural das aguas subterrâneas rasas. Os resultados apontam mudancas sazonais na composicao quimica das aguas em decorrencia da variacao do processo de lixiviacao na zona nao saturada.
O presente trabalho apresenta um método simplificado para calibração de curva de descarga, descon... more O presente trabalho apresenta um método simplificado para calibração de curva de descarga, desconsiderando a correção da vazão pela declividade da linha de água e o método do desnível normal. A aplicação deste modelo estatístico, com base na análise de regressão linear à calibração de curva-chave em estação fluviométrica instável, sob efeito de remanso, foi aplicado na Sub-Bacia do rio Tapajós no Posto Fluviométrico de Itaituba, inclusa na Região Hidrográfica Amazônica. Os dados de medições de descargas realizadas em Itaituba e dos níveis fluviométricos do posto de Santarém na confluência dos rios Amazonas/Tapajós, foram obtidos do Banco de dados da Agência Nacional de Águas para a calibração e validação deste modelo proposto. Os índices para avaliar a eficiência do ajustamento da equação calibrada encontrados foram o coeficiente de correlação múltipla (R = 0,9454), coeficiente de Nesh-Sutecliffe (CNS = 0,8938) e do coeficiente de desvio (D= 4,86%). A equação desenvolvida do modelo ...
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