1000 resultados para horizontes hidráulicos


Relevância:

20.00% 20.00%

Publicador:

Resumo:

At head of title: Daniel de la Vega.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Poems.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Poems.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

O empreendedorismo tem sido um tema recorrente no mundo corporativo e acadêmico. Porém, o comportamento, as escolhas e os aspectos que formam o empreendedor ainda são questões emergentes na universidade. Desse modo, o objetivo dessa dissertação é discutir esses pontos e avançar sobre questões referentes às escolhas profissionais ao longo de uma carreira empreendedora. Para isso, foi desenvolvida uma régua de classificação que posicionou os estudantes de pós-graduação da Fundação Armando Álvares Penteado nas seguintes categorias: (1) empreendedores internos; (2) tendência a empreendedor interno; (3) tendência a empreendedor externo; e (4) empreendedor externo. O resultado dessa dissertação é a validação desta régua bem como uma classificação da tendência empreendedora dos pesquisados, destacando-se alunos com tendência empreendedora externa e interna respectivamente.(AU)

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Los feminismos son una de esas teorías marco cuyas contribuciones son perceptibles en todos los ámbitos de la sociedad, incluidos los estudios de traducción. La materialización más evidente de esta interacción es el surgimiento, en los 80, de una corriente de traducción feminista en Canadá, capaz de colocar el género en el centro del debate sobre traducción. En la actualidad, y pese a las críticas y posteriores redefiniciones del concepto de traducción feminista, la propuesta canadiense sigue concibiéndose por lo general como paradigma de interacción entre feminismos y traducción. En este artículo propongo nuevas aproximaciones a la práctica de traducir y paratraducir desde los feminismos, dentro de una tercera ola de traducción feminista. Además, pretendo abrir el debate (re)examinando áreas de interés mutuo para los estudios de traducción y los feminismos en el plano conceptual, historiográfico y crítico, con el propósito de que sugieran nuevas líneas de investigación futura. Feminisms are one of those framework theories that have contributed powerfully to all areas of society, including Translation Studies. The most evident outcome of this interplay is the emergence, in the 1980s, of a Feminist Translation school in Canada, which placed gender in the spotlight. Despite criticism and subsequent redefinitions of the notion of feminist translation, the Canadian school is still generally regarded as the paradigm of interaction between feminisms and translation. The aim of this article is two-fold: firstly, to advance new approaches to the practice of translation and paratranslation from a feminist perspective (within the context of a third wave of feminist translation). Secondly, to open new debates by means of (re)examining topics of mutual interest for both Translation Studies and Feminisms on a conceptual, historical and critical plane, so that subsequent studies can be fostered. Feminisms are one of those framework theories that have contributed powerfully to all areas of society, including Translation Studies. The most evident outcome of this interplay is the emergence, in the 1980s, of a Feminist Translation school in Canada, which placed gender in the spotlight. Despite criticism and subsequent redefinitions of the notion of feminist translation, the Canadian school is still generally regarded as the paradigm of interaction between feminisms and translation. The aim of this article is two-fold: firstly, to advance new approaches to the practice of translation and paratranslation from a feminist perspective (within the context of a third wave of feminist translation). Secondly, to open new debates by means of (re)examining topics of mutual interest for both Translation Studies and Feminisms on a conceptual, historical and critical plane, so that subsequent studies can be fostered.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

With the increasing environmental awareness, maximizing biodegradability and minimizing ecotoxicity is the main driving force for new technological developments. Thus, can be developed new biodegradable lubricants for use in environmentally sensitive areas. The aim of this study was to obtain new bio-lubricants from passion fruit (Passiflora edulis Sims f. flavicarpa Degener) and moringa (Moringa oleifera Lamarck) epoxidized oils and develop a new additive package using experimental design for their use as a hydraulic fluid. In the first stage of this work was performed the optimization of the epoxidation process of the oils using fractional experimental design 24-1 , varying the temperature, reaction time, ratio of formic acid and hydrogen peroxide. In the second step was investigated the selectivity, thermodynamics and kinetics of the reaction for obtaining the two epoxides at 30, 50 and 70 °C. The result of the experimental design confirmed that the epoxidation of passion fruit oil requires 2 hours of reaction, 50 °C and a ratio H2O2/C=C/HCOOH (1:1:1). For moringa oil were required 2 hours reaction, 50 °C and a ratio of H2O2/C=C/HCOOH (1:1:1.5). The results of the final conversions were equal to 83.09% (± 0.3) for passion fruit oil epoxide and 91.02 (±0,4) for moringa oil epoxide. Following was made the 23 factorial design to evaluate which are the best concentrations of corrosion inhibitor and anti-wear (IC), antioxidant (BHA) and extreme pressure (EP) additives. The bio-lubricants obtained in this step were characterized according to DIN 51524 (Part 2 HLP) and DIN 51517 (Part 3 CLP) standards. The epoxidation process of the oils was able to improve the oxidative stability and reduce the total acid number, when compared to the in natura oils. Moreover, the epoxidized oils best solubilized additives, resulting in increased performance as a lubricant. In terms of physicochemical performance, the best lubricant fluid was the epoxidized moringa oil with additives (EMO-ADI), followed by the epoxidized passion fruit oil with additives (EPF-ADI) and, finally, the passion fruit in natura oil without additives (PFO). Lastly, was made the investigation of the tribological behavior under conditions of boundary lubrication for these lubricants. The tribological performance of the developed lubricants was analyzed on a HFRR equipment (High Frequency Reciprocating Rig) and the coefficient of friction, which occurs during the contact and the formation of the lubricating film, was measured. The wear was evaluated through optical microscopy and scanning electron microscopy (SEM). The results showed that the addition of extreme pressure (EP) and anti-wear and corrosion inhibitor (CI) additives significantly improve the tribological properties of the fluids. In all assays, was formed a lubricating film that is responsible for reducing the coefficient of metal-to-metal wear. It was observed that the addition of EP and IC additives in the in natura vegetable oils of passion fruit and moringa did not favor a significant reduction in wear. The bio-lubricants developed from passion fruit and moringa oils modified via epoxidation presented satisfactory tribological properties and shown to be potential lubricants for replacement of commercial mineral-based fluids.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

The understanding of the occurrence and flow of groundwater in the subsurface is of fundamental importance in the exploitation of water, just like knowledge of all associated hydrogeological context. These factors are primarily controlled by geometry of a certain pore system, given the nature of sedimentary aquifers. Thus, the microstructural characterization, as the interconnectivity of the system, it is essential to know the macro properties porosity and permeability of reservoir rock, in which can be done on a statistical characterization by twodimensional analysis. The latter is being held on a computing platform, using image thin sections of reservoir rock, allowing the prediction of the properties effective porosity and hydraulic conductivity. For Barreiras Aquifer to obtain such parameters derived primarily from the interpretation of tests of aquifers, a practice that usually involves a fairly complex logistics in terms of equipment and personnel required in addition to high cost of operation. Thus, the analysis and digital image processing is presented as an alternative tool for the characterization of hydraulic parameters, showing up as a practical and inexpensive method. This methodology is based on a flowchart work involving sampling, preparation of thin sections and their respective images, segmentation and geometric characterization, three-dimensional reconstruction and flow simulation. In this research, computational image analysis of thin sections of rocks has shown that aquifer storage coefficients ranging from 0,035 to 0,12 with an average of 0,076, while its hydrogeological substrate (associated with the top of the carbonate sequence outcropping not region) presents effective porosities of the order of 2%. For the transport regime, it is evidenced that the methodology presents results below of those found in the bibliographic data relating to hydraulic conductivity, mean values of 1,04 x10-6 m/s, with fluctuations between 2,94 x10-6 m/s and 3,61x10-8 m/s, probably due to the larger scale study and the heterogeneity of the medium studied.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Los viajes combinados han ocupado tradicionalmente un lugar destacado dentro de la amplia gama de servicios ofrecidos por los operadores turísticos. Por ello, el Consejo de la Unión Europea adoptó en 1990 la Directiva 90/314/CEE, de 13 de junio, relativa a los viajes combinados, las vacaciones combinadas y los circuitos combinados, con el fin de eliminar, o cuanto menos mitigar, la especial situación de indefensión en que se encontraba aquél que los contrataba. Desde la aprobación de esta Directiva han pasado casi veinticinco años y ante el surgimiento de problemas derivados de la aparición de nuevos modelos de negocio y formas de contratación de los servicios turísticos que ni siquiera se plantearon en aquel momento, se ha hecho necesaria la revisión de una normativa a todas luces obsoleta e incapaz de proteger adecuadamente a los usuarios de estos servicios. Así, el 9 de julio de 2013 la Comisión Europea aprobó la Propuesta de Directiva del Parlamento Europeo y del Consejo relativa a los viajes combinados y los servicios asistidos de viaje, por la que se modifican el Reglamento (CE) nº 2006/2004 y la Directiva 2011/83/UE y por la que se deroga la Directiva 90/314/CEE. El objetivo de este trabajo se centra en analizar las modificaciones propuestas por la C C omisión respecto al ámbito de aplicación de la Directiva 90/314/CEE y su posible repercusión en las legislaciones internas, sobre todo teniendo en cuenta el enfoque de armonización máxima que se pretende dar al nuevo texto.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

La relación más importante entre los países está sustentada en el comercio internacional, por lo que su actividad origina una fuerza de desarrollo económico; las importaciones permiten a los inversionistas y empresas adquirir productos que en su país no se fabrican, facilita adquirirlos de acuerdo a las características y atributos específicos, a precios bajos y de buena calidad para enfrentar con éxito a la competencia. La presente investigación plantea el desarrollo de un plan de importación de Sistemas Hidráulicos fabricados en Centro y Sur América que contribuya con información confiable para los inversionistas y empresas ferreteras que deseen incursionar en la comercialización de bombas de agua provenientes de esas regiones, el plan de importación de Sistemas de bombeo de agua procedentes de dichas regiones es una herramienta que brinda los pasos a seguir en el proceso, iniciando desde el momento de inscribirse como importador hasta el despacho de la mercadería, de forma específica para este producto. El plan se desarrolla en tres capítulos de la siguiente manera: En el capítulo uno, el marco teórico contiene características del comercio internacional, comercio exterior, principalmente sus ventajas, se exponen generalidades sobre las importaciones, e información relevante sobre el producto a importar, de igual forma un marco legal que es el que regula las diferentes actividades relacionadas a la importación. En el capítulo dos se desarrolla la metodología de la investigación, tabulación e interpretación de los resultados obtenidos. Además, se describen las conclusiones y recomendaciones derivadas de la investigación. El capítulo tres contiene la propuesta del plan de importación de Sistemas de bombeo de agua que se llevaría a cabo desde Sur América hacia El Salvador, en el cual con la investigación de determino que Brasil, Argentina, Chile y Colombia son los fabricantes de estos productos, se detalla cada paso a seguir en dicha importación, y finalmente, se presenta la bibliografía consultada para el desarrollo del documento y los anexos como soporte de la investigación.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

El presente trabajo realiza un estudio sobre los comentaristas de la Divina Comedia del siglo XIV y algunos del XV, examinando su papel como intérpretes del poema dantiano tanto desde el punto de vista literario como histórico e ideológico en el momento de transición de la Edad Media al Humanismo, tomando en cuenta las señales que de esta evolución se van encontrando ya en los comentarios inmediatamente posteriores a la muerte de Dante. Uno de los aspectos que faltaba tratar en la historia de los estudios era un trabajo comparativo sobre el modo de conocimiento de todos y cada uno de los más importantes comentaristas antiguos por lo que concierne las alegorías y el método hermenéutico utilizado. Así el análisis interpretativo en los comentarios antiguos de algunas de las alegorías más conocidas, pero también muy controvertidas, como las tres fieras y el contrapasso, ha sido el punto de partida para el presente trabajo. Se ha optado por hacer “hablar” a los comentaristas a través de un acercamiento al texto lo más directo posible, sin tomar posiciones críticas predefinidas, para favorecer un acercamiento al texto de una manera lo más filológicamente neutral...

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Fil: Abate, Stella Maris. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Universidade Estadual de Campinas. Faculdade de Educação Física

Relevância:

10.00% 10.00%

Publicador:

Resumo:

The mineralogical characterization through mineral quantification of Brazilian soils by X-ray diffraction data using the Rietveld Method is not common. A mineralogical quantification of an Acric Ferralsol from the Ponta Grossa region, state of Paraná, Brazil, was carried out using this Method with X-Ray Diffraction data to verify if this method was suitable for mineral quantification of a highly-weathered soil. The A, AB and B3 horizons were fractioned to separate the different particle sizes: clay, silt, fine sand (by Stokes Law) and coarse sand fractions (by sieving), with the procedure free of chemical treatments. X-ray Fluorescence, Inductively Coupled Plasma Atomic Emission Spectrometry, Infrared Spectroscopy and Mössbauer Spectroscopy were used in order to assist the mineral identification and quantification. The Rietveld Method enabled the quantification of the present minerals. In a general way, the quantitative mineralogical characterization by the Rietveld Method revealed that quartz, gibbsite, rutile, hematite, goethite, kaolinite and halloysite were present in the clay and silt fractions of all horizons. The silt fractions of the deeper horizons were different from the more superficial ones due to the presence of large amounts of quartz. The fine and the coarse sand fractions are constituted mainly by quartz. Therefore, a mineralogical quantification of the finer fraction (clay and silt) by the Rietveld Method was successful.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

This paper examines the role of parent rock, pedogenetic processes and airborne pollution in heavy metal accumulation in soils from a remote oceanic island, Fernando de Noronha, Brazil. We studied five soil profiles developed from different volcanic rocks. Mineralogical composition and total concentrations of major and trace elements were determined in 43 samples. The obtained concentrations range for heavy metals were: Co: 26-261 ppm; Cu: 35-97 ppm; Cr: 350-1446 ppm; Ni: 114-691 ppm; Zn: 101-374 ppm; Hg: 2-150 ppb. The composition of soils is strongly affected by the geochemical character of the parent rock. Pedogenesis appears to be responsible for the accumulation of Zn, Co, and, to a lesser extent, of Ni and Cu, in the upper, Mn- and organic carbon-enriched horizons of the soil profiles. Pedogenic influence may also explain the relationship observed between Cr and the Fe. Hg is likely to have been added to the soil profile by long-range atmospheric transport. Its accumulation in the topsoil was further favoured by the formation of stable complexes with organic matter. Clay minerals do not appear to play an important role in the fixation of heavy metals.