960 resultados para Castellà -- Morfologia


Relevância:

20.00% 20.00%

Publicador:

Resumo:

Original in Huntington Library; positive in University of Wisconsin library.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Contiene: vol. 1 - vol. 2.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Annotation: marginalia in unknown hand.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

O trabalho analisa a relação entre Comunicação e Inovação nos Portais Corporativos das empresas Embraer, Natura, Faber-Castell e Rigesa. Ou seja, como essas instituições inovam em suas comunicações no meio on-line e como divulgam o conteúdo sobre Inovação. Estas empresas foram selecionadas como corpus central da pesquisa por estarem entre as mais inovadoras do Brasil, de acordo com a primeira versão do Índice Brasil de Inovação de 2007. A metodologia central para o desenvolvimento do projeto é a de Estudos de Caso Múltiplos, a partir da qual foi feita a comparação da comunicação digital por meio dos portais corporativos. Também são utilizados os recursos da Análise de Conteúdo e da Análise do Discurso. A proposta inclui também o exame da utilização das Tecnologias da Informação e Comunicação para a veiculação de informações institucionais e sobre Inovação por meio das Salas de Imprensa. E ainda, são destacadas as características dos profissionais responsáveis pela gestão dos portais corporativos. Os resultados da pesquisa evidenciam que há uma contradição entre as empresas serem inovadoras em produtos e processos, mas não no planejamento, gestão, arquitetura e divulgação da imagem institucional e de informações sobre inovação por meio dos portais corporativos. Revela ainda um nicho de mercado que precisa de profissionais especializados.(AU)

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Os anfíbios anuros formam um grupo comprovadamente monofilético e apresentam várias características em comum que estão relacionadas, principalmente, a adaptação das espécies à ambientes úmidos, aonde estas se desenvolvem e reproduzem. Apesar da restrição do ambiente de reprodução, as espécies de anfíbios anuros apresentam grande diversidade morfológica, como também a maior diversidade de modos reprodutivos relatados para todos os grupos de tretápodas atuais. O Brasil é o país com maior riqueza de anfíbios anuros com, aproximadamente, 950 espécies descritas até o momento. A maioria das espécies do território brasileiro apresentam uma fase larval que, na maioria dos casos, se desenvolve no ambiente aquático e não apresenta qualquer semelhança com a sua forma adulta, seja na sua morfologia ou no nicho ecológico que ocupa. As larvas de anfíbios anuros são comumente utilizadas em estudos taxonômicos e fornecem informações importantes que auxiliam na classificação das espécies. Além disso, a identificação das espécies baseadas na forma larvária facilitam estudos de ecologia de populações e comunidades, como também, tornam mais precisos inventários faunísticos. Apesar disso, aproximadamente 50% dos girinos das espécies de anuro que ocorrem no território brasileiro não são conhecidas e existem poucos trabalhos com foco na variação dos caracteres larvais ao longo de várias populações, o que dificulta a avaliação da sua utilidade em estudos taxonômicos e pode contribuir, por exemplo, para a existência de espécies crípticas. Além disso, existem poucos trabalhos que descrevem a diversidade morfológica larval com enfoque em regiões específicas e, no Brasil, exsitem, apenas, três chaves de identificação de espécies com base nos caracteres larvais. A falta de descrições afeta diretamente trabalhos sobre anurofauna no país, e dificultam o desenvolvimento de trabalhos experimentais ou de interações ecológicas, por exemplo. Logo, descrições de girinos são necessários para tornar mais completo o conhecimento sobre a anurofauna das espécies que ocorrem no território brasileiro. Com isso, este trabalho teve como objetivo fornecer dados que complementam o conhecimento existente sobre as formas larvais no território brasileiro, com foco na anurofauna da região sudeste do Estado do Rio Grande do Norte. Neste trabalho, são descritos os girinos de cinco espécies cuja forma larval ainda não era conhecida, como também, elaboro uma chave de identificação dicotômica baseada em caracteres larvais para a região sudeste do Estado do Rio Grande do Norte e comento sobre a utilidade dos caracteres larvais para a taxonomia e sistemática dos diversos grupos de anfíbios anuros abordados neste trabalho. Além disso, uma nova espécie do gênero Pseudopaludicola é descrita e os caracteres larvais auxiliaram em sua diagnose e na diferenciação de congeneros. Os resultados gerados aqui poderão ser úteis ou auxiliar em trabalhos futuros que necessitem da identificação das formas larvais de anfíbios anuros, principalmente, no Estado do Rio Grande do Norte.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

The mesoporous materials has been an special attention, among them was discovered in the 1990´s the mesoporous molecular sieve of SBA-15 type. The good features of the SBA- 15 makes this material very promising in catalysis, however, due to the absence of native active sites, it has low catalytic activity. In this way, different metals and oxides have been included in this molecular sieve as a means of introducing active sites and increase its catalytic activity. Among the oxides that are being researched, there is the niobium oxide, which presents strong acid sites and exists in abundance. Brazil is the largest producer of the mineral. On the other hand, the production of biofuels has been desired, but it requires the development of new catalysts for this purpose. The aim of this work was to develop silicate of niobium by impregnation and by new synthesis method for application in the cracking of moringa oil. The methodology consisted of inserting the niobium oxide either by postsynthesis process using wet impregnation and direct insertion. For direct insert a new method was developed for pH adjustment, being tested different pH, and the pH 2.2 was used different ratios of Si/Nb. The materials were characterized by different techniques such as: XRD, N2 adsorption, SEM, EDS, UV-visible, TG/DTG, DSC, TEM, acidity by thermodesorption of n-butilamine and FTIR. After this part of the catalysts developed by the two methods were tested in the thermocatalytic cracking of moringa oil, being used a simple distillation. All silicates of Niobium obtained showed a highly ordered structure, having high specific areas, good distribution of pore diameters, beyond present a morphology in the form of fibers. In the catalysts after synthesis was observed that the niobium inserted has so as octahedrally and tetrahedrally coordinated, demonstrating that there were also oxides formed on the external surface of SBA-15. The materials obtained in the direct synthesis are only tetrahedrally coordinated. The new synthesis method of pH adjusting by using the buffer solution for it, proved to be very efficient for the production of such materials, because the materials obtained showed characteristics and structures similar to the molecular sieve of SBA-15 type. Among the pH tested the material that presented better characteristics was synthesized at pH 2.2. The application of these materials in catalytic cracking showed a higher formation of organic liquids when compared to thermal cracking, in addition to significantly reducing the acidity and residues formed, demonstrating that the use of silicates of Niobium increases both the conversion and the selectivity of the products.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

This thesis is part of research on new materials for catalysis and gas sensors more active, sensitive, selective. The aim of this thesis was to develop and characterize cobalt ferrite in different morphologies, in order to study their influence on the electrical response and the catalytic activity, and to hierarchize these grains for greater diffusivity of gas in the material. The powders were produced via hydrothermal and solvothermal, and were characterized by thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, transmission electron microscopy (electron diffraction, highresolution simulations), and energy dispersive spectroscopy. The catalytic and electrical properties were tested in the presence of CO and NO2 gases, the latter in different concentrations (1-100 ppm) and at different temperatures (room temperature to 350 ° C). Nanooctahedra with an average size of 20 nm were obtained by hydrothermal route. It has been determined that the shape of the grains is mainly linked to the nature of the precipitating agent and the presence of OH ions in the reaction medium. By solvothermal method CoFe2O4 spherical powders were prepared with grain size of 8 and 20 nm. CoFe2O4 powders exhibit a strong response to small amounts of NO2 (10 ppm to 200 ° C). The nanooctahedra have greater sensitivity than the spherical grains of the same size, and have smaller response time and shorter recovery times. These results were confirmed by modeling the kinetics of response and recovery of the sensor. Initial tests of catalytic activity in the oxidation of CO between temperatures of 100 °C and 350 °C show that the size effect is predominant in relation the effect of the form with respect to the conversion of the reaction. The morphology of the grains influence the rate of reaction. A higher reaction rate is obtained in the presence of nanooctahedra. In order to improve the detection and catalytic properties of the material, we have developed a methodology for hierarchizing grains which involves the use of carbonbased templates.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Mathematical Morphology presents a systematic approach to extract geometric features of binary images, using morphological operators that transform the original image into another by means of a third image called structuring element and came out in 1960 by researchers Jean Serra and George Matheron. Fuzzy mathematical morphology extends the operators towards grayscale and color images and was initially proposed by Goetherian using fuzzy logic. Using this approach it is possible to make a study of fuzzy connectives, which allows some scope for analysis for the construction of morphological operators and their applicability in image processing. In this paper, we propose the development of morphological operators fuzzy using the R-implications for aid and improve image processing, and then to build a system with these operators to count the spores mycorrhizal fungi and red blood cells. It was used as the hypothetical-deductive methodologies for the part formal and incremental-iterative for the experimental part. These operators were applied in digital and microscopic images. The conjunctions and implications of fuzzy morphology mathematical reasoning will be used in order to choose the best adjunction to be applied depending on the problem being approached, i.e., we will use automorphisms on the implications and observe their influence on segmenting images and then on their processing. In order to validate the developed system, it was applied to counting problems in microscopic images, extending to pathological images. It was noted that for the computation of spores the best operator was the erosion of Gödel. It developed three groups of morphological operators fuzzy, Lukasiewicz, And Godel Goguen that can have a variety applications

Relevância:

20.00% 20.00%

Publicador:

Resumo:

The sabiá (Mimosa caesalpiniaefolia Benth.) is an endemic species of the Caatinga biome, considered tolerant to salt and water stress. The process of salinization of soil and groundwater and surface water is one of the most important problems of environmental degradation, with its harmful effects being more pronounced in the areas of arid and semiarid regions, and rapidly growing in many parts of the globe, causing problems of the major crop yield. Organic conditioners as barnyard manure, and rice hulls can contribute to reducing the PST, possibly due to the release of CO2 and the production of organic acids during the decomposition of organic matter, and act as sources of calcium and magnesium and inhibit the availability sodium. The intimate association of mycorrhizae and beneficial to plants results in increased uptake of water and nutrients by plants, especially phosphorus, due to their low mobility in soil. The objective of this study was to evaluate the initial growth of thrush seedlings under inoculation with mycorrhizal fungi and fertilized with manure corral and irrigated with water of different salinity levels. The experiment was conducted in greenhouse conditions of vegetation on the premises of the Agricultural School of Jundiaí - UFRN, Campus Macaíba. The adopted statistical design was randomized composed of twelve treatments - three substrates (sterile soil, manure and FMA), four salinity levels (0.2, 1.5, 3.0 and 4.5 dS m-1 ) and five repetitions, totaling sixty experimental units. The results indicate that inoculation with mycorrhizal fungi own contributions to the growth of plants, especially in roots and shoots, which suggests that its application is beneficial in establishing thrush plants in natural conditions, with poor soil in P. Levels salinity caused no effects with statistical significance in plant development, indicating Sabia resistance to it.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

The incursion into the historical area from Fortaleza´s downtown presents reminiscences of a heritage collection that can be recognized as city built heritage, in architectural and urban aspects. The neighborhood has in its urban tracing a synthesis of the various phases from the Brazilian architecture materialized in its tracing and built goods. This composition mainly covers the eclectic production, passing the time of art déco, including the period of modern production. This paper aims to identify the existing heritage collection. This study aims to identify the existing net assets, the temporality and spatiality that allow to recreate the neighborhood´s form urbain history. Based on the theoretical and methodological support of the urban morphology urban of authors such as Aldo Rossi (1966), Gordon Cullen (1971), José Lamas (1990), Kevin Lynch (1960), and Philippe Panerai (1999) was allowed on a predefined route, to build part of urban memory of Fortaleza. The historical and morphological study runs through a sequenced analysis developed on the articulated subsets, formed by the network neighborhood squares: Praça José de Alencar, Praça Capistrano de Abreu (Lagoinha), Praça Clóvis Beviláquia, Praça do Carmo, Praça Murilo Borges (BNB), Praça Coração de Jesus, Parque das Crianças, Praça do Riacho Pajeú, Praça dos Voluntários (Polícia), Praça do Ferreira, Praça Waldemar Falcão (Correios), Praça General Tibúrcio (Leões), Praça Figueira de Melo, Bosque Dom Delgado (Pajeú), Praça Cristo Redentor, Praça Caio Prado (Sé), Praça dos Mártires (Passeio Público), e Praça Castro Carreira (Estação). Separated the neighborhood based on this square system because it is perceived that there is in these public spaces a path which includes a portion of the urban history of Fortaleza. In addition to this there is a higher concentration of goods in its area in relation to others sectors of the neighborhood, where the loss of the characterization is an imperative of the urban set. In order to find this network of public spaces contained in the study area were proposed two routes based on the city limits of 1875 established by Adolfo Herbster (Fortaleza´s city plan).The path starts by known boulevards (Imperador, Duque de Caxias and Dom Manuel avenues) and the seafront. The study is grounded in the literature review, document and empirical theme, consisting of an overlay of maps, drawings and photographic collection that ratify this net assets as both architectural urban nowadays. Among the results, it was observed that before a current context of loss of locus of the concept of historical-cultural agglomerated, the squares express the strongholds of equity ambience that perhaps stand in urban morphology of the capital from Ceará.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

O objetivo deste trabalho foi avaliar morfologicamente as membranas de PES preparadas a partir do uso de misturas de polivinilpirrolidona (PVP K-30 e K-90), visando ajustar as condições de síntese para a obtenção de uma membrana isenta de macroporos.