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Search Results: 1 - 10 of 6688 matches for " Christine Tamásy "
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New Geographies of Accumulation, Globalising Firm Networks and the Role of the Auckland Region in the Australasian Economy
Susan Fairgray,Christine Tamásy,Richard Le Heron
Urbani Izziv , 2012,
Abstract: Surprisingly little theoretical or empirical research is available on Auckland’s actual functional and geographic connectivity, including developments relating to closer economic relations with Australia. This paper draws on the geography of accumulation literatures to argue that close attention must be given to developments in the three circuits of capital (trade, production and finance) if the changing character and contributions of globalising firm networks are to be discerned and understood. The empirical investigations show that for Australian owned firms globalising rather than purely Australasian networks are the norm, network complexity is considerable and that it makes sense to think of Auckland’s economy in globalising terms. A globalising networks perspective means that estimates of the magnitude and assessments of the character of employment contributions of Australian owned firms to the Auckland economy reflects these interdependencies.
Relational Dimensions of Regional Growth: Introduction to the Special Issue
Pere Suau-Sanchez,Montserrat Pallares-Barbera,Christine Tamásy,Mike Taylor
Urbani Izziv , 2012,
Anuran amphibians' diversity in a northwestern area of the Brazilian Pantanal
Pansonato, André;Mott, Tamí;Strüssmann, Christine;
Biota Neotropica , 2011, DOI: 10.1590/S1676-06032011000400008
Abstract: in the pantanal, the largest continuous floodplain in the world, the diversity and distribution of anuran amphibians vary in and across distinct subregions and distinct habitats occurring along inundation gradients. permanent and natural aquatic habitats are relatively scarce in the pantanal, and occurrence of temporary aquatic habitats varies seasonally, depending on rains. we here present results of evaluations of anuran's species richness and abundance in a seasonally flooded area in the northwestern section of the pantanal (fazenda baía de pedra, cáceres municipality, state of mato grosso, brazil), comparing values obtained in 10 plots systematically distributed over 5 km2 with those obtained in additional aquatic plots in the study area. data were obtained in five field trips, from february 2008 to march 2009. in addition to the plots, 36 water bodies (20 permanent and 16 temporary) were also sampled for the presence of anurans. in total, 3,983 individuals from 34 anuran species distributed in five families were recorded: hylidae (14 species), leptodactylidae (8), leiuperidae (6), microhylidae (4), and bufonidae (2). local richness represents 77.3% of the anuran diversity already recorded for the brazilian pantanal. the number of species recorded exclusively in systematically distributed terrestrial plots and in water bodies was 28 and 32, respectively. sampling methods used at fazenda baía da pedra were efficient in determining anuran richness, abundance, composition and distribution. evaluations of anuran richness and abundance by using permanent sampling plots in the pantanal may benefit from additional sampling sites, particularly permanent and temporary water bodies.
Modulation of Motor Cortex Excitability by Physical Similarity with an Observed Hand Action
Marie-Christinesy, Hugo Théoret
PLOS ONE , 2007, DOI: 10.1371/journal.pone.0000971
Abstract: The passive observation of hand actions is associated with increased motor cortex excitability, presumably reflecting activity within the human mirror neuron system (MNS). Recent data show that in-group ethnic membership increases motor cortex excitability during observation of culturally relevant hand gestures, suggesting that physical similarity with an observed body part may modulate MNS responses. Here, we ask whether the MNS is preferentially activated by passive observation of hand actions that are similar or dissimilar to self in terms of sex and skin color. Transcranial magnetic stimulation-induced motor evoked potentials were recorded from the first dorsal interosseus muscle while participants viewed videos depicting index finger movements made by female or male participants with black or white skin color. Forty-eight participants equally distributed in terms of sex and skin color participated in the study. Results show an interaction between self-attributes and physical attributes of the observed hand in the right motor cortex of female participants, where corticospinal excitability is increased during observation of hand actions in a different skin color than that of the observer. Our data show that specific physical properties of an observed action modulate motor cortex excitability and we hypothesize that in-group/out-group membership and self-related processes underlie these effects.
Déborah Alix-Sy,Christine Le Scanff,Edith Filaire
Journal of Sports Science and Medicine , 2008,
Abstract: This study investigated pre-competition physiological and psychological states of eighteen elite soccer players. Salivary cortisol was assessed during a non- training day and before three league games. Affective states (unpleasant and pleasant, somatic and transactional emotions) were evaluated using the Tension and Effort-Stress Inventory before the three league games. Participants formed 2 groups, 11 starters and 7 non-starters, depending on the starting list established by the coach. All players reported more intense pleasant transactional and somatic emotions than unpleasant ones prior to all games (p < 0.05), and relatively stable profiles of these psychological responses were observed across the three league games. However, salivary cortisol levels increased during pre-game for all players in comparison with the non- training day (p < 0.001). This anticipatory rise was only related to unpleasant somatic emotions (p < 0.001). This demonstrates that cortisol can be used as an index of emotional response to competition
Phase-field crystal modelling of crystal nucleation, heteroepitaxy and patterning
László Gránásy,Gy?rgy Tegze,Gyula I. Tóth,Tamás Pusztai
Physics , 2010, DOI: 10.1080/14786435.2010.487476
Abstract: We apply a simple dynamical density functional theory, the phase-field-crystal (PFC) model, to describe homogeneous and heterogeneous crystal nucleation in 2d monodisperse colloidal systems and crystal nucleation in highly compressed Fe liquid. External periodic potentials are used to approximate inert crystalline substrates in addressing heterogeneous nucleation. In agreement with experiments in 2d colloids, the PFC model predicts that in 2d supersaturated liquids, crystalline freezing starts with homogeneous crystal nucleation without the occurrence of the hexatic phase. At extreme supersaturations crystal nucleation happens after the appearance of an amorphous precursor phase both in 2d and 3d. We demonstrate that contrary to expectations based on the classical nucleation theory, corners are not necessarily favourable places for crystal nucleation. Finally, we show that adding external potential terms to the free energy, the PFC theory can be used to model colloid patterning experiments.
Polymorphism, crystal nucleation and growth in the phase-field crystal model in 2d and 3d
Gyula I. Tóth,Gy?rgy Tegze,Tamás Pusztai,László Gránásy
Physics , 2010, DOI: 10.1088/0953-8984/22/36/364101
Abstract: We apply a simple dynamical density functional theory, the phase-field crystal (PFC) model of overdamped conservative dynamics, to address polymorphism, crystal nucleation, and crystal growth in the diffusion-controlled limit. We refine the phase diagram for 3d, and determine the line free energy in 2d, the height of the nucleation barrier in 2d and 3d for homogeneous and heterogeneous nucleation by solving the respective Euler-Lagrange (EL) equations. We demonstrate that in the PFC model, the body-centered cubic (bcc), the face-centered cubic (fcc), and the hexagonal close packed structures (hcp) compete, while the simple cubic structure is unstable, and that phase preference can be tuned by changing the model parameters: close to the critical point the bcc structure is stable, while far from the critical point the fcc prevails, with an hcp stability domain in between. We note that with increasing distance from the critical point the equilibrium shapes vary from sphere to the specific faceted shapes: rhombic-dodecahedron (bcc), truncated-octahedron (fcc), and hexagonal prism (hcp). Solving the equation of motion of the PFC model supplied with conserved noise, solidification starts with the nucleation of an amorphous precursor phase, into which the stable crystalline phase nucleates. The growth rate is found to be time dependent and anisotropic, which anisotropy depends on the driving force. We show that due to the diffusion-controlled growth mechanism, which is especially relevant for crystal aggrega-tion in colloidal systems, dendritic growth structures evolve in large-scale isothermal single-component PFC simula-tions. Finally, we present results for eutectic solidification in a binary PFC model.
Spiraling eutectic dendrites
Tamás Pusztai,László Rátkai,Attila Szállás,László Gránásy
Physics , 2013, DOI: 10.1103/PhysRevE.87.032401
Abstract: Eutectic dendrites forming in a model ternary system have been studied using the phase-field theory. The eutectic and one-phase dendrites have similar forms, and the tip radius scales with the interface free energy as for one-phase dendrites. The steady-state eutectic patterns appearing on these two-phase dendrites include concentric rings, and single- to multiarm spirals, of which the fluctuations choose, a stochastic phenomenon characterized by a peaked probability distribution. The number of spiral arms correlates with tip radius and the kinetic anisotropy.
Free energy of the bcc-liquid interface and the Wulff shape as predicted by the Phase-Field Crystal model
Frigyes Podmaniczky,Gyula I. Tóth,Tamás Pusztai,László Gránásy
Physics , 2014, DOI: 10.1016/j.jcrysgro.2013.01.036
Abstract: The Euler-Lagrange equation of the phase-field crystal (PFC) model has been solved under appropriate boundary conditions to obtain the equilibrium free energy of the body centered cubic crystal-liquid interface for 18 orientations at various reduced temperatures in the range $\epsilon\in\left[0,0.5\right]$. While the maximum free energy corresponds to the $\left\{ 100\right\} $ orientation for all $\epsilon$ values, the minimum is realized by the $\left\{ 111\right\} $ direction for small $\epsilon\,(<0.13)$, and by the $\left\{ 211\right\} $ orientation for higher $\epsilon$. The predicted dependence on the reduced temperature is consistent with the respective mean field critical exponent. The results are fitted with an eight-term Kubic harmonic series, and are used to create stereographic plots displaying the anisotropy of the interface free energy. We have also derived the corresponding Wulff shapes that vary with increasing $\epsilon$ from sphere to a polyhedral form that differs from the rhombo-dodecahedron obtained previously by growing a bcc seed until reaching equilibrium with the remaining liquid.
Phase-Field Modeling of Solidification in Light-Metal Matrix Nanocomposites
Tamás Pusztai,László Rátkai,Attila Szállás,László Gránásy
Physics , 2014, DOI: 10.1002/9781118888179.ch83
Abstract: The quantitative phase-field approach has been adapted to model solidification in the presence of Metal Matrix Nanocomposites (MMNCs) in a single-component liquid. Nanoparticles of fixed size and shape are represented by additional fields. The corresponding equations of motion are assumed to ensure relaxation dynamics, and can be supplemented by random forces (realizing Brownian motion) or external fields. The nanoparticles are characterized by two model parameters: their mobility and the contact angle they realize with the solid-liquid interface. We investigate the question how grain size distribution can be influenced by heterogeneous nucleation on the nanoparticles and by the front-particle interaction. We explore, furthermore, how materials and process parameters, such as temperature, density and size/shape distribution of the nanoparticles, influence microstructure evolution.
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