987 resultados para orientamento :: 341 :: Orientamento A


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Analisa a organização do Estado Federal brasileiro, estabelecida pela Constituição Federal de 1988, a partir de estudos da doutrina especializada e de trabalhos e informações de estudiosos sobre o tema proposto. Aborda a repartição de competências determinada pela atual Constituição, de forma a identificar se as relações intergovernamentais existentes entre os entes federados ocorrem de maneira a caracterizar um federalismo cooperativo no Estado brasileiro.

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[Es] Existen numerosas investigaciones y testimonios que destacan el papel de la educación formal y de los maestros en la construcción de la resiliencia de alumnos procedentes de entornos desfavorecidos y en riesgo de exclusión social. En todas las personas, en los alumnos y en los educadores, hay aspectos de resiliencia a partir de los cuales es posible ayudar a superar las dificultades y afrontar el futuro con confianza y optimismo. La escuela recibe a alumnos que están en situación de desventaja social, familiar o personal y que son sujetos de riesgo de exclusión educativa: fracaso escolar, inadaptación y conflictividad. Ante estas realidades no se puede permanecer expectante. En consecuencia, es necesario que todos los que forman parte de la comunidad escolar, y en particular los docentes, afronten decididamente los nuevos retos de la educación actual y desarrollen dinámicas educativas que contribuyan a formar personas capaces de participar activamente en la sociedad, sujetos preparados para afrontar con posibilidades reales de éxito las inevitables dificultades de la vida.

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Eguíluz, Federico; Merino, Raquel; Olsen, Vickie; Pajares, Eterio; Santamaa, José Miguel (eds.)

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This study analyzed species richness, distribution, and sighting frequency of selected reef fishes to describe species assemblage composition, abundance, and spatial distribution patterns among sites and regions (Upper Keys, Middle Keys, Lower Keys, and Dry Tortugas) within the Florida Keys National Marine Sanctuary (FKNMS) barrier reef ecosystem. Data were obtained from the Reef Environmental Education Foundation (REEF) Fish Survey Project, a volunteer fish-monitoring program. A total of 4,324 visual fish surveys conducted at 112 sites throughout the FKNMS were used in these analyses. The data set contained sighting information on 341 fish species comprising 68 families. Species richness was generally highest in the Upper Keys sites (maximum was 220 species at Molasses Reef) and lowest in the Dry Tortugas sites. Encounter rates differed among regions, with the Dry Tortugas having the highest rate, potentially a result of differences in the evenness in fishes and the lower diversity of habitat types in the Dry Tortugas region. Geographic coverage maps were developed for 29 frequently observed species. Fourteen of these species showed significant regional variation in mean sighting frequency (%SF). Six species had significantly lower mean %SF and eight species had significantly higher mean %SF in the Dry Tortugas compared with other regions. Hierarchical clustering based on species composition (presence-absence) and species % SF revealed interesting patterns of similarities among sites that varied across spatial scales. Results presented here indicate that phenomena affecting reef fish composition in the FKNMS operate at multiple spatial scales, including a biogeographic scale that defines the character of the region as a whole, a reef scale (~50-100 km) that include meso-scale physical oceanographic processes and regional variation in reef structure and associated reef habitats, and a local scale that includes level of protection, cross-shelf location and a suite of physical characteristics of a given reef. It is likely that at both regional and local scales, species habitat requirements strongly influence the patterns revealed in this study, and are particularly limiting for species that are less frequently observed in the Dry Tortugas. The results of this report serve as a benchmark for the current status of the reef fishes in the FKNMS. In addition, these data provide the basis for analyses on reserve effects and the biogeographic coupling of benthic habitats and fish assemblages that are currently underway. (PDF contains 61 pages.)

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ass="sa">alt="" hspace="8" width="100" height="153" align="left" />Adiabatic shear localization is a mode of failure that occurs in dynamic loading. It is characterized by thermal softening occurring over a very narrow region of a material and is usually a precursor to ductile fracture and catastrophic failure. This reference source is the first detailed study of the mechanics and modes of adiabatic shear localization in solids, and provides a systematic description of a number of aspects of adiabatic shear banding. The inclusion of the appendices which provide a quick reference section and a comprehensive collection of thermomechanical data allows rapid access and understanding of the subject and its phenomena. The concepts and techniques described in this work can usefully be applied to solve a multitude of problems encountered by those investigating fracture and damage in materials, impact dynamics, metal working and other areas. This reference book has come about in response to the pressing demand of mechanical and metallurgical engineers for a high quality summary of the knowledge gained over the last twenty years. While fulfilling this requirement, the book is also of great interest to academics and researchers into materials performance.
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Table of Contents

able border="0" id="yui_3_7_3_1_1356267270901_1331">1Introductionalign="right">11.1What is an Adiabatic Shear Band?align="right">11.2The Importance of Adiabatic Shear Bandsalign="right">61.3Where Adiabatic Shear Bands Occuralign="right">101.4Historical Aspects of Shear Bandsalign="right">111.5Adiabatic Shear Bands and Fracture Mapsalign="right">141.6Scope of the Bookalign="right">202Characteristic Aspects of Adiabatic Shear Bandsalign="right">242.1General Featuresalign="right">242.2Deformed Bandsalign="right">272.3Transformed Bandsalign="right">282.4Variables Relevant to Adiabatic Shear Bandingalign="right">352.5Adiabatic Shear Bands in Non-Metalsalign="right">443Fracture and Damage Related to Adiabatic Shear Bandsalign="right">543.1Adiabatic Shear Band Induced Fracturealign="right">543.2Microscopic Damage in Adiabatic Shear Bandsalign="right">573.3Metallurgical Implicationsalign="right">693.4Effects of Stress Statealign="right">734Testing Methodsalign="right">764.1General Requirements and Remarksalign="right">764.2Dynamic Torsion Testsalign="right">804.3Dynamic Compression Testsalign="right">914.4Contained Cylinder Testsalign="right">954.5Transient Measurementsalign="right">985Constitutive Equationsalign="right">1045.1Effect of Strain Rate on Stress-Strain Behaviouralign="right">1045.2Strain-Rate History Effectsalign="right">1105.3Effect of Temperature on Stress-Strain Behaviouralign="right">1145.4Constitutive Equations for Non-Metalsalign="right">1246Occurrence of Adiabatic Shear Bandsalign="right">1256.1Empirical Criteriaalign="right">1256.2One-Dimensional Equations and Linear Instability Analysisalign="right">1346.3Localization Analysisalign="right">1406.4Experimental Verificationalign="right">1467Formation and Evolution of Shear Bandsalign="right">1557.1Post-Instability Phenomenaalign="right">1567.2Scaling and Approximationsalign="right">1627.3Wave Trapping and Viscous Dissipationalign="right">1677.4The Intermediate Stage and the Formation of Adiabatic Shear Bandsalign="right">1717.5Late Stage Behaviour and Post-Mortem Morphologyalign="right">1797.6Adiabatic Shear Bands in Multi-Dimensional Stress Statesalign="right">1878Numerical Studies of Adiabatic Shear Bandsalign="right">1948.1Objects, Problems and Techniques Involved in Numerical Simulationsalign="right">1948.2One-Dimensional Simulation of Adiabatic Shear Bandingalign="right">1998.3Simulation with Adaptive Finite Element Methodsalign="right">2138.4Adiabatic Shear Bands in the Plane Strain Stress Statealign="right">2189Selected Topics in Impact Dynamicsalign="right">2299.1Planar Impactalign="right">2309.2Fragmentationalign="right">2379.3Penetrationalign="right">2449.4Erosionalign="right">2559.5Ignition of Explosivesalign="right">2619.6Explosive Weldingalign="right">26810Selected Topics in Metalworkingalign="right">27310.1Classification of Processesalign="right">27310.2Upsettingalign="right">27610.3Metalcuttingalign="right">28610.4Blankingalign="right">293 Appendicesalign="right">297AQuick Referencealign="right">298BSpecific Heat and Thermal Conductivityalign="right">301CThermal Softening and Related Temperature Dependencealign="right">312DMaterials Showing Adiabatic Shear Bandsalign="right">335ESpecification of Selected Materials Showing Adiabatic Shear Bandsalign="right">341FConversion Factorsalign="right">357 Referencesalign="right">358 Author Indexalign="right">369 Subject Indexalign="right">375able>

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ENGLISH: Yellowfin and skipjack tuna occur in commercial quantities in the Eastern Pacific Ocean from California to Chile. They are captured in the high seas at distances from the mainland up to several hundred miles (see Alverson, 1960). The Inter-American Tropical Tuna Commission has been engaged for several years in research on the biology, ecology, and population dynamics of the stocks of these species supporting the commercial fishery, in order to elucidate the effects of the fishery and of fishery independent factors on their abundance and behavior, to provide the scientific basis for rational management of the fishery. An important aspect of this research is the investigation of the migrations of these species in the Eastern Pacific, and the determination of whether each consists of but a single population or is composed of various sub-populations. One direct means of approaching these problems is the tagging, and subsequent recovery, of specimens in the region of the commercial fishery. This also provides direct information on growth rates, by comparison of sizes of specimens at tagging and upon later recovery, and can furnish the basis of estimating rates of mortality. These are two of the important elements of the vital statistics of the tuna populations. SPANISH: El atún aleta amarilla y el barrilete se encuentran en cantidades comerciales en el Océano Pacífico Oriental, desde California hasta Chile. Estos peces son capturados en alta mar a varios cientos de millas de distancia de tierra firme (ver Alverson, 1960). La Comisión Interamericana del Atún Tropical ha estado dedicada durante varios años a la investigación de la biología, ecología y dinámica de las poblaciones de los stocks de las indicadas especies que mantienen la pesquería comercial, a fin de elucidar los efectos de ésta y de los factores independientes de la explotación sobre la abundancia y hábitos de estos peces, para obtener una base científica que permita una administración racional de la pesquería. Un aspecto importante de esta investigación es el estudio de los movimientos migratorios de estas especies en el Pacífico Oriental, y la determinación de que si cada una constituye una sola población o está compuesta de varias subpoblaciones. Un medio directo de abordar estos problemas es el de la marcación, y subsecuente recuperación, de especímenes en la región de la pesquería comercial. Esto también proporciona una información directa sobre la tasa de crecimiento, por la comparación de los tamaños de los especímenes al ser marcados y recuperados más tarde y puede proveer la base para estimar las tasas de mortalidad. Estos son dos de los elementos importantes de las estadísticas vitales de las poblaciones de atún.

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341 p.

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The fabrication and operational techniques of Malian and Ndurutu traps mostly used by the fishermen in River Rima in north western Nigeria were evaluated through structured questionnaire and measurement of samples of the Data collected were analyzed using descriptive statistics. There was no standard in the dimensions of either of the traps. The traps were made of locally sourced materials, except the synthetic net of the Malian trap. About 81 and 80% of the respondents fabricated their Malian and Ndurutu traps, respectively. The major problems encountered in the structure and operation of the Malian trap included projection above water, stealing of catches and trap, and trapping of small sized fishes as indicated by 61.9, 47.6 and 28.6% of the respondents, respectively. In the case of the Ndurutu trap, 72.0, 48.0, 12.0 and 8.0% of the respondents respectively indicated poor durability, single entrance valve, destruction by cattle and instability in water, as the major problems encountered. As improvement measures for the Malian trap, the respondents suggested increase in number and size of valve (81.0%), horizontal positioning (57.1%) and square shape (47.6%) while 52.0% each suggested increase in number of entrance valve and netting of Ndurutu trap. The fishermen demonstrated ingenuity in the fabrication and operation of the traps, but they failed to initiate the required improvement. It is important to critically examine the designs, materials, costs and limitations of the traps and the suggestions of the fishermen, as basis for improvement on the technology of the traps