Annotated record of the detailed examination of Mn deposits from DSDP Site 32, Leg 5 (Cores 5-32-13, 5-32-14)

Site 32 was proposed by the Pacific Advisory Panel at a location over a strong positive magnetic anomaly (Number 13 on the Pittman-Heirtzler scale, 38 million years) where samples of the basement and the basal sediment would be of value in testing hypotheses for origin of the linear magnetic anomalies from this part of the Pacific. Comparison of this site, south of the Pioneer Fracture Zone, with later sites north of the Fracture Zone would be the basis for evaluating the discontinuity formed by the Pioneer.

Element analyses of DSDP/ODP Hole 504B basalt and breccia (Table 2)

Geochemical well logs were used to measure the dry weight percent oxide abundances of Si, Al, Ca, Mg, Fe, Ti, and K and the elemental abundances of Gd, S, Th, and U at 0.15-m intervals throughout the basement section of Hole 504B. These geochemical data are used to estimate the integrated chemical exchange resulting from hydrothermal alteration of the oceanic crust that has occurred over the last 5.9 Ma. A large increase in Si in the transition zone between pillows and dikes (Layers 2B and 2C) indicates that mixing of hot, upwelling hydrothermal fluids with cold, downwelling seawater occurred in the past at a permeability discontinuity at this level in the crust, even though the low-to-high permeability boundary in Hole 504B is now 500 m shallower (at the Layer 2A/2B boundary). The observations of extensive Ca loss and Mg gain agree with chemical exchanges recorded in the laboratory in experiments on the reactions that occur between basalt and seawater at high temperatures. The K budget requires significant addition to Layer 2A from both high-temperature depletion in Layers 2B and 2C and low-temperature alteration by seawater. Integrated water/rock ratios are derived for the mass of seawater required to add enriched elements and for the mass of hydrothermal fluid required to remove depleted elements in the crust at Hole 504B.

Late-career international migration and reproductive work. A comparison between Peruvian and Ukrainian women in the Southern Europe

Research on the relationship between reproductive work and women´s life trajectories including the experience of labour migration has mainly focused on the case of relatively young mothers who leave behind, or later re-join, their children. While it is true that most women migrate at a younger age, there are a significant number of cases of men and women who move abroad for labour purposes at a more advanced stage, undertaking a late-career migration. This is still an under-estimated and under-researched sub-field that uncovers a varied range of issues, including the global organization of reproductive work and the employment of migrant women as domestic workers late in their lives. By pooling the findings of two qualitative studies, this article focuses on Peruvian and Ukrainian women who seek employment in Spain and Italy when they are well into their forties, or older. A commonality the two groups of women share is that, independently of their level of education and professional experience, more often than not they end up as domestic and care workers. The article initially discusses the reasons for late-career female migration, taking into consideration the structural and personal determinants that have affected Peruvian and Ukrainian women’s careers in their countries of origin and settlement. After this, the focus is set on the characteristics of domestic employment at later life, on the impact on their current lives, including the transnational family organization, and on future labour and retirement prospects. Apart from an evaluation of objective working and living conditions, we discuss women’s personal impressions of being domestic workers in the context of their occupational experiences and family commitments. In this regard, women report varying levels of personal and professional satisfaction, as well as different patterns of continuity-discontinuity in their work and family lives, and of optimism towards the future. Divergences could be, to some extent, explained by the effect of migrants´ transnational social practices and policies of states.

Promover la inclusión de las familias a través del desarrollo de Proyectos de Trabajo. Un estudio de caso

Se presenta una investigación cualitativa centrada en un estudio de caso realizado en un aula de niños y niñas de 5 años. Se analiza la potencialidad de la metodología de Proyectos de Trabajo (en adelante, PT) para facilitar la inclusión de las familias en el proceso de enseñanzaaprendizaje de sus hijos e hijas. A través de tres entrevistas en profundidad a las familias y de la documentación pedagógica obtenemos información que, tras ser analizada, revela los siguientes hallazgos: (1) La metodología de PT utiliza como parte esencial del proceso de enseñanzaaprendizaje los conocimientos y la experiencia profesional de las familias; (2) Las familias asumen un papel de tutorización y acompañamiento en los procesos educativos de sus hijos e hijas que, de forma simultánea, se producen en la escuela y en sus casas. Ajustan sus intervenciones a las demandas y realizan una labor de mediación entre las capacidades infantiles y el nuevo material de aprendizaje; (3) La colaboración de las familias, presente desde el inicio hasta que concluye el PT, requiere un compromiso muy elevado, resultando ser un elemento imprescindible para el desarrollo de esta metodología; y (4) Las familias identifican como fortaleza de los PT la escucha al alumnado. Como limitaciones, el tiempo desmesurado que requiere, las diferencias que puede generar en el alumnado los diferentes niveles de implicación de sus respectivas familias y la discontinuidad de este método con otras formas más tradicionales de afrontar la enseñanza en etapas posteriores.

Crack propagation in non-homogenous materials: Evaluation of mixed-mode SIFs, T-stress and kinking angle using a variant EFG method

A new variant of the Element-Free Galerkin (EFG) method, that combines the diffraction method, to characterize the crack tip solution, and the Heaviside enrichment function for representing discontinuity due to a crack, has been used to model crack propagation through non-homogenous materials. In the case of interface crack propagation, the kink angle is predicted by applying the maximum tangential principal stress (MTPS) criterion in conjunction with consideration of the energy release rate (ERR). The MTPS criterion is applied to the crack tip stress field described by both the stress intensity factor (SIF) and the T-stress, which are extracted using the interaction integral method. The proposed EFG method has been developed and applied for 2D case studies involving a crack in an orthotropic material, crack along an interface and a crack terminating at a bi-material interface, under mechanical or thermal loading; this is done to demonstrate the advantages and efficiency of the proposed methodology. The computed SIFs, T-stress and the predicted interface crack kink angles are compared with existing results in the literature and are found to be in good agreement. An example of crack growth through a particle-reinforced composite materials, which may involve crack meandering around the particle, is reported.

Genomic and archaeological evidence suggest a dual origin of domestic dogs

The geographic and temporal origins of dogs remain controversial. We generated genetic sequences from 59 ancient dogs and a complete (28x) genome of a late Neolithic dog (dated to ~4800 calendar years before the present) from Ireland. Our analyses revealed a deep split separating modern East Asian and Western Eurasian dogs. Surprisingly, the date of this divergence (~14,000 to 6400 years ago) occurs commensurate with, or several millennia after, the first appearance of dogs in Europe and East Asia. Additional analyses of ancient and modern mitochondrial DNA revealed a sharp discontinuity in haplotype frequencies in Europe. Combined, these results suggest that dogs may have been domesticated independently in Eastern and Western Eurasia from distinct wolf populations. East Eurasian dogs were then possibly transported to Europe with people, where they partially replaced European Paleolithic dogs.

Investigations on the Radiation Characteristics of Broadband Strip Loaded Slotted Microstrip Antennas

With the recent progress and rapid increase in mobile terminals, the design of antennas for small mobile terminals is acquiring great importance. In view of this situation, several design concepts are already been addressed by the scientists and engineers. Compactness and efficiency are the major criteria for mobile terminal antennas. The challenging task of the microwave scientists and engineers is to device compact printed radiating systems having broadband behavior, together with good efficiency. Printed antenna technology has received popularity among antenna scientists after the introduction of microstrip antenna in 1970s. The successors in this kind such as printed monopoles and planar inverted F are also equally important. Scientists and Engineers are trying to explore this technology as a viable coast effective solution for forthcoming microwave revolution. The transmission line perspectives of antennas are very interesting. The concept behind any electromagnetic radiator is simple. Any electromagnetic system with a discontinuity is radiating electromagnetic energy. The size, shape and the orientation of the discontinuities controls the radiation characteristics of the system such as radiation pattern, gain, polarization etc. It can be either resonant or non resonant structure.

Vannevar Bush e as matrizes discursivas de As we may think: por uma possível história da Ciência da Informação

MEDEIROS, A. L.; VANTI, Nadia. Vannevar Bush e as matrizes discursivas de As we may think: por uma possível história da Ciência da Informação. Informação & sociedade:Estudos. João Pessoa, v. 21, p. 31-39, 2011

O Modelo de gestão participativa do Plano Nacional do Turismo (PNT-2003/2007): a atuação do CONETUR/RN

To implement policies and plans at the tourist sector involve disposition to the establishment of parceries among government and private initiative, space to the action of studious, researchers and professionals of several areas of knowledge and formation, able of to give new courses no only at the tourism, but to the economy how a every, seen which the tourism had a effect multiplicator, reaching 52 sectors of the economy. At this sense, the Brazil came pruning for a new phase of politic actuation at the touristy activity. Until the year 2002, the tourism politic in the Brazil no had detail, because herself treated of isolated actions and many without continuity. However, at to start 2003, several actions were developed in order to contribute for the national touristy planning. The principal was the creation of Ministério do Turismo, accompanied of the formulation and implementation of the Plano Nacional do Turismo (2003/2007). This work pretend to understand the implementation at the Rio Grande do Norte of the model of participative administration extolled by Plano Nacional do Turismo. The your centre detail the action of the Conselho Estadual de Turismo do Rio Grande do Norte (CONETUR), to promote the participation at the tourism public policies. The bibliographical research contemplated diverse sources in order to compile knowledge of credential authors in the quarrel of inherent subjects to the participation and to the tourism public policies, especially at the Brazil. A qualitative perspective the case study was adapted as research method and for attainment of the data interviews with the members of the Conselho had been carried through beyond consultation the referring documents the dynamics of functioning of the Conselho. The principal actuations of the CONETUR, the directives tourism public policies already made and directed to implementation, the type of participation at made decision, the principal difficulties of the implementation of the participative administration model of the Plano Nacional do Turismo and the degree of participation of the members of the Conselho at the reunions had been identified. The results had shown that exist some difficulties at the implementation of the participation at the Conselho Estadual de Turismo do Rio Grande do Norte, knowledge of the Conselheiros of CONETUR function, the presence of bodies which doesn t directly connected at the touristy activity; the absence of time of the Conselheiros to be presents at reunions; the discontinuity of the presidency of the Conselho; among others. So, the CONETUR show himself how a Conselho with participative characteristics, but with some adapted needs.

Three-dimensional free surface modelling in an unstructured mesh environment for metal processing applications

In the casting of metals, tundish flow, welding, converters, and other metal processing applications, the behaviour of the fluid surface is important. In aluminium alloys, for example, oxides formed on the surface may be drawn into the body of the melt where they act as faults in the solidified product affecting cast quality. For this reason, accurate description of wave behaviour, air entrapment, and other effects need to be modelled, in the presence of heat transfer and possibly phase change. The authors have developed a single-phase algorithm for modelling this problem. The Scalar Equation Algorithm (SEA) (see Refs. 1 and 2), enables the transport of the property discontinuity representing the free surface through a fixed grid. An extension of this method to unstructured mesh codes is presented here, together with validation. The new method employs a TVD flux limiter in conjunction with a ray-tracing algorithm, to ensure a sharp bound interface. Applications of the method are in the filling and emptying of mould cavities, with heat transfer and phase change.

Lucrecio, "De rerum natura": Sentido y coherencia del prólogo

El prólogo del De rerum natura de Lucrecio (1.1-148) parece ser un tema gastado: ha sido tratado decenas de veces tanto por su excelente calidad como por los problemas que plantea. Pero esperamos poder dar un nuevo sentido y solución a ambos aspectos. En primer lugar, el himno a Venus no es una mera convención, sino que respira sentimiento religioso; Venus no personifica a la naturaleza, sino al placer y la felicidad y ni la hegemonía que se dice ejerce Venus, ni las plegarias que contiene el himno contradicen la teología epicúrea. Todavía más, nos parece que el himno constituye una auténtica epifanía religiosa muy propia de la teología epicúrea. En segundo lugar, suponiendo que el autor ha tomado como tema compartido los schemata o grados de dificultad de la intellectio retórica en el texto de 1.50-148, se intentan solucionar las dificultades de coherencia del texto.

Vannevar Bush e as matrizes discursivas de As we may think: por uma possível história da Ciência da Informação

MEDEIROS, A. L.; VANTI, Nadia. Vannevar Bush e as matrizes discursivas de As we may think: por uma possível história da Ciência da Informação. Informação & sociedade:Estudos. João Pessoa, v. 21, p. 31-39, 2011

Professor de dupla habilitação: (des)continuidades entre o 1º e 2ºciclos do ensino básico

Relatório de estágio apresentado à Escola Superior de Educação de Paula Frassinetti para a obtenção do grau de Mestre em Ensino do 1.º e 2.º Ciclo do Ensino Básico

Formação e profissionalidade: um estudo na formação inicial de professores do ensino básico em Moçambique

Visando analisar a Formação Inicial de Professores (FIP) do Ensino Básico em Moçambique, no intuito de captar como concorre para a construção da representação de profissionalidade na atividade docente, este estudo descritivo e interpretativo estrutura-se em duas dimensões complementares (extensiva e intensiva). Através dessas duas dimensões procurou-se explicitar os pontos críticos do objeto de estudo e produzir conhecimento sobre o mesmo. E, nessa linha, nas conclusões do estudo ficarão disponíveis possíveis contributos para a melhoria da sustentação e eficácia da formação inicial. Na dimensão extensiva, em função de descritores de profissionalidade associados ao reconhecimento social de uma atividade como profissional, definidos na literatura investigativa da sociologia das profissões e da educação, analisou-se a noção de profissionalidade que norteia a FIP. Essa análise foi desenvolvida com recurso ao estudo de documentos legais e curriculares, inquéritos por questionário a 289 formadores e por entrevista a 7 agentes-chave da formação de professores (gestores, académicos e formadores de professores). Na dimensão intensiva, concretizada num estudo multicaso (4 estudos de caso) envolvendo, essencialmente, 16 formadores de 4 instituições de formação de professores (polos), aprofundou-se a compreensão da visão de formadores de professores sobre profissionalidade, com recurso à observação de atividade docente e respetiva planificação, entrevistas semi-estruturadas a 4 gestores da Prática Pedagógica e estágio nesses polos, à luz do quadro teórico fundamentador dos caraterizadores de profissionalidade referenciais do estudo e dos resultados obtidos na dimensão extensiva. Os resultados do estudo denotam falta de sintonia entre o conceito de ensinar patenteado nos documentos e discursos dos agentes-chave da Formação de Professores (a indicar que ensinar é fazer aprender) e a prática letiva dos formadores, a denunciar que ensinar é entendido como expôr conteúdos/transmitir conhecimentos. Quanto aos caraterizadores de profissionalidade, discursivamente destacam-se como atributos reconhecidos ao professor: ser educador e profissional; possuir conhecimento específico para ensinar; ter a função e a responsabilidade de ensinar; ser inovador e investigador; e agir de acordo com o quadro deontológico associado à profissão. No entanto, estas representações entram em choque com a realidade, marcada por falta de poder dos professores sobre o currículo e sobre o conhecimento profissional, que não produzem nem controlam; baixas qualificações (possuem nível correspondente à 10ª classe); inexistência de um quadro deontológico específico e por uma prática docente dos formadores inscrita na racionalidade técnica e mais alinhada com uma dinâmica de funcionarização do que de profissionalização. Na esteira do isomorfismo pedagógico, da chamada naturalização das práticas de ensino, e da força da gramática escolar, o tipo de prática docente que marca a ação dos formadores tenderá a ser replicada pelos formandos quando professores. Aliás, os documentos curriculares parecem resumir o ser profissional ao facto de se possuir formação para professores. O estudo fundamenta a possibilidade de, nas políticas, se reforçar uma maior coerência entre discursos e práticas na visão de profissionalidade construída na FIP, aprofundar os pontos de descontinuidade detetados no estudo ou outros relevantes e trabalhar no sentido da clarificação do conceito de profissionalidade pretendida na Formação de Professores do Ensino Básico em Moçambique.

Thermal activation, long-range ordering, and topological frustration of artificial spin ice

Frustrated systems, typically characterized by competing interactions that cannot all be simultaneously satisfied, are ubiquitous in nature and display many rich phenomena and novel physics. Artificial spin ices (ASIs), arrays of lithographically patterned Ising-like single-domain magnetic nanostructures, are highly tunable systems that have proven to be a novel method for studying the effects of frustration and associated properties. The strength and nature of the frustrated interactions between individual magnets are readily tuned by design and the exact microstate of the system can be determined by a variety of characterization techniques. Recently, thermal activation of ASI systems has been demonstrated, introducing the spontaneous reversal of individual magnets and allowing for new explorations of novel phase transitions and phenomena using these systems. In this work, we introduce a new, robust material with favorable magnetic properties for studying thermally active ASI and use it to investigate a variety of ASI geometries. We reproduce previously reported perfect ground-state ordering in the square geometry and present studies of the kagome lattice showing the highest yet degree of ordering observed in this fully frustrated system. We consider theoretical predictions of long-range order in ASI and use both our experimental studies and kinetic Monte Carlo simulations to evaluate these predictions. Next, we introduce controlled topological defects into our square ASI samples and observe a new, extended frustration effect of the system. When we introduce a dislocation into the lattice, we still see large domains of ground-state order, but, in every sample, a domain wall containing higher energy spin arrangements originates from the dislocation, resolving a discontinuity in the ground-state order parameter. Locally, the magnets are unfrustrated, but frustration of the lattice persists due to its topology. We demonstrate the first direct imaging of spin configurations resulting from topological frustration in any system and make predictions on how dislocations could affect properties in numerous materials systems.