299 resultados para índice tampão de fosfato


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One of the main challenges in the mining sector at present, related to the optimization of mineral assets, consists in to find the best proportion of each geological material to be mined and homogenized to ensure high productivity and stability in ore processing plants. The stability of a mineral processing plant is factor for achieving operational excellence, as a stable performance of the plants ensures economy and adherence to financial planning businesses. Is already well Know that the feed rate of the processing plants is dependent on the hardness and quality of the ore. Therefore, the ore behavior predictability is the solution to ensure the stability of mineral processing plants. This work was developed in Anglo American Phosphate Brazil Ltda., at the Fazenda Chapadão Phosphate Mine, located in the southeastern portion of the state of Goiás, in the municipalities of Catalão and Ouvidor. The phosphate ore is the result of supergene apatite concentration in the weathering profile of the alkaline ultramafic phlogopitized rocks, intruded by foscoritic and carbonatitic rocks series. The weathering profile has about 100 meters thick and is divided into three basic types, from top to bottom, coinciding with decreasing intensity of weathering: oxidized ore, micaceous ore and weathered rock. In each portion of this weathering profile, mainly near the contacts between these three divisions, are hard materials, cemented by minerals such as apatite, quartz, goethite, monazite and barite. The different features presented by these materials makes to be vital the correct identification, quantification and location of different hard materials in the mine area, to maximize its use. The main objective of this study was to define the type of cementation of hard materials which predominates in each portion of the weathering profile in the mine, as well as their relationship with the protolith. The work involved geological mapping, channel sampling...

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The objective of the present work is the construction of percentual indexes of sustainable development "Status" - PIDSD (%) aiming to order and classify the rural settlements, considering agricultural, socioeconomic and environmental aspects, in order to diagnose their sustainable reality. This way, we considered multivariate statistical procedure to establish analytical descriptors - indexes - like the principal components technique (CP). The CP technique was used in a matrix formed by 47 variables observed in 50 rural settlements, distributed in seven different regions of the state of Mato Grosso, obtained from diagnostics, provided by "Mato-Grossense" Enterprise of Research, Assistance and Rural Extension S/A - EMPAER - MT, in order to obtain the indexes used in the construction of PIDSD (%). The settlements with higher PIDSD (%) were considered "higher potential" or "higher sustainable" in relation to the analyzed variables, making the establishment of assistance strategies and cooperation possible, allowing the government and civil society in general, to improve those with worse results ("lower potential" or "lower sustainable"), and search for ways to strengthen and multiply the results of the "higher potential" settlements. Vale do Seringal settlement had the best conditions in relation to the variables, mainly those of higher weigh and was considered the one with "higher potential". São Sebastião had the worst conditions and was considered "lower potential".

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Time series tendencies are an important tool for different sectors such as the scientific community, industries and environmental protection agencies who can evaluate the variability of a specific parameter in time, what is very important piece of information for establishing corrective and preventive actions. This work presents a time series model of main physical, chemical and biological parameters of the Water Quality Index (WQI) determined for different selected points of a hydrographical basin form May/2006 to Aug/2010. The statistical model Arima enabled a better understanding of the physical, chemical and biological processes that most clearly influences WQI. The Arima model allowed the assessment of the trend of several parameters used in the calculation of the WQI, showing that dissolved oxygen, turbidity, total nitrogen, and fecal E. coli were highly correlated and are the parameters that caused the index changes over time.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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The urban area is now home to 50% of world population and the activities related to their disorganized growth, promote the formation of an unhealthy environment. The urban vegetation is necessary and beneficial, because in addition to bringing the man of nature, mitigates climate change and improve the urban microclimate. This study aimed at surveying and analyzing the rate of existing vegetation in urban Piratininga - SP, and from the data obtained, provide allowance for management and planning of green areas and urban areas. Data came from sample survey conducted in 2007 and computerized survey conducted in 2010 indicated that many new neighborhoods have low opt for planting trees of small to medium which does not enhance the urban environment requiring an environmental planning.

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Pós-graduação em Ciência da Informação - FFC

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Ciência e Tecnologia Animal - FEIS

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Desde a antiguidade, enxertos e membranas são estudados para promoverem um reparo ósseo otimizado. O reparo ósseo consiste na reabsorção do tecido necrosado e de seu coágulo, juntamente com um processo inflamatório que libera fatores de crescimento que irão reparar o osso danificado. Em algumas situações, o osso lesionado não tem a capacidade de se auto reparar, portanto, são necessárias intervenções cirúrgicas para inserir um enxerto ósseo. Entretanto, há uma grande dificuldade em se encontrar um material que forneça os fatores necessários para o crescimento ósseo. Para isso, foram confeccionadas membranas à base de ácido polilático e poli-ε-caprolactona (PLC) (Purasorb: PLC 7015 - Purac, Holanda), com a incorporação de fosfato de lantânio (PLC/LaPO4) e oxiapatita dopada com 20% de lantânio (PLC/La20OAP) pelo Instituto de Química de Araraquara, UNESP. Assim, o objetivo do presente estudo foi avaliar a citotoxicidade desses materiais por meio dos testes XTT e sobrevivência clonogênica. Os eluatos foram preparados com as membranas citadas de acordo com a ISO 10993-12. O cloridrato de doxorrubicina foi utilizado como controle positivo para ambos os testes. Como Controle Negativo (CN) foram utilizadas somente as células CHO-K1 (sem a ação de qualquer tratamento) por 24 horas. Os eluatos foram mantidos em contato com células CHO-K1 por 24 horas. Como os dados apresentaram aderência à curva normal, foi aplicada a análise de variância (ANOVA) one-way, seguido dos testes de Tukey e Dunnett (p<0,05). Verificou-se que os materiais testados não demonstraram absorbância estatisticamente diferente em relação ao CN (p>0,05; Dunnett - XTT) e também não causaram comprometimento na capacidade proliferativa das células (p>0,05; Dunnett - Sobrevivência clonogênica). Assim, pode-se concluir que as amostras de PLC, PLC/LaPO4 e PLC/La20OAP não apresentaram citotoxicidade em células CHO-K1.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)