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Search Results: 1 - 10 of 78 matches for " Migliorini "
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Risk factors and injury mechanism in Triathlon
SERGIO MIGLIORINI
Journal of Human Sport and Exercise , 2011,
Abstract: In the triathlon the combined practice of swimming, cycling and running permits the reduction of overuse injuries compared to the practice of the running alone. Redistribution of stress over several part of the body and correction of muscle imbalance are cited as reasons for the reduction in injuries occurrence. Nonetheless, like other endurance sports, 80-85% of triathlon injuries can be scribed to overuse. From an etiopathogenetic point of view the overuse injuries must be studied in relation to the technical characteristics of the triathlon, to the transitional phases between the disciplines and particularly to the cycle-run transition, to the different load of training that the preparation of the Olympic distance requires compared to the long distance triathlon. Most of the injuries are caused by running and athletes most at risk are former swimmers and cyclists, since they lack of running experience and muscle elasticity. The triathlon cycle-run transition (T2) is a period of particular risk for knee and lower back injury. The knee, the ankle/foot and the lower back are the anatomic site most at risk of injuries. Ileotibial band friction syndrome is common in age groupers whereas Achilles tendon injuries and stress fractures occur more in elite athletes. Previous injuries are correlated with injuries occurrence and the sudden changes in training intensity or volume, hill training and the insufficient development of running technical ability are injuries extrinsic factors. The acute traumatology is due almost exclusively to falls in training and competition in cycling. The episodes of rhabdomiolysis are instead not rare, associated or not to exertional heat/idratation injuries. Injury prevention is based in particular on the learning of the correct technique of the three disciplines, on the right programming of the training sessions, on the study of the overload that the biomechanics of the transition phases between the three sports act on the locomotor apparatus and on the suitability of the technical instruments used.
The Critical Properties of Two-dimensional Oscillator Arrays
G. Migliorini
Physics , 2007, DOI: 10.1088/1751-8113/41/32/324021
Abstract: We present a renormalization group study of two dimensional arrays of oscillators, with dissipative, short range interactions. We consider the case of non-identical oscillators, with distributed intrinsic frequencies within the array and study the steady-state properties of the system. In two dimensions no macroscopic mutual entrainment is found but, for identical oscillators, critical behavior of the Berezinskii-Kosterlitz-Thouless type is shown to be present. We then discuss the stability of (BKT) order in the physical case of distributed quenched random frequencies. In order to do that, we show how the steady-state dynamical properties of the two dimensional array of non-identical oscillators are related to the equilibrium properties of the XY model with quenched randomness, that has been already studied in the past. We propose a novel set of recursion relations to study this system within the Migdal Kadanoff renormalization group scheme, by mean of the discrete clock-state formulation. We compute the phase diagram in the presence of random dissipative coupling, at finite values of the clock state parameter. Possible experimental applications in two dimensional arrays of microelectromechanical oscillators are briefly suggested.
On the corrections to Strong-Stretching Theory for end-confined, charged polymers in a uniform electric field
Gabriele Migliorini
Physics , 2010, DOI: 10.1021/ma101722n
Abstract: We investigate the properties of a system of semi-diluted polymers in the presence of charged groups and counter-ions, by means of self-consistent field theory. We study a system of polyelectrolyte chains grafted to a similarly, as well as an oppositely charged surface, solving a set of saddle-point equations that couple the modified diffusion equation for the polymer partition function to the Poisson-Boltzmann equation describing the charge distribution in the system. A numerical study of this set of equations is presented and comparison is made with previous studies. We then consider the case of semi-diluted, grafted polymer chains in the presence of charge-end-groups. We study the problem with self-consistent field as well as strong-stretching theory. We derive the corrections to the Milner-Witten-Cates (MWC) theory for weakly charged chains and show that the monomer-density deviates from the parabolic profile expected in the uncharged case. The corresponding corrections are shown to be dictated by an Abel-Volterra integral equation of the second kind. The validity of our theoretical findings is confirmed comparing the predictions with the results obtained within numerical self-consistent field theory.
Self-Consistent Field Theory of Disordered Block-Copolymers
Gabriele Migliorini
Physics , 2011,
Abstract: We derive the mean-field theory of disordered block-copolymers composed of two monomeric species, combining Edwards' functional method with the replica technique of disordered systems. In the absence of disorder we recover the canonical self-consistent field theory of inhomogeneous polymers. In the presence of sequence disorder the theory can be regarded as a comprehensive, novel self-consistent treatment of copolymer melts, unifying the weak- and strong-inhomogeneous regimes. In particular, we study the stability of the microphase separation transition in a melt of diblock-copolymers, composed of $N$ monomers and equal $A$- $B$-volume fraction, against the disruptive effect of disorder. We obtain a phase diagram in terms of the relevant parameters, namely the rescaled Flory-Huggins parameter $\chi N$ and disorder strength $p$.
Tobacco control in the Russian Federation- a policy analysis
Karsten Lunze, Luigi Migliorini
BMC Public Health , 2013, DOI: 10.1186/1471-2458-13-64
Abstract: We used a policy triangle as analytical framework to examine content, context, and processes of Russian tobacco control policy. The analysis was based on secondary data on supply and demand sides of the Russian tobacco epidemic, tobacco-related economic and health effects during Russia's economic transition, and compliance of Russian tobacco policy with international standards and regulations.Tobacco-promoting strategies have specifically targeted women and youth. Russia's approval of a "National Tobacco Control Concept" and draft for a comprehensive tobacco control bill increasingly align national legislature with the WHO Framework Convention on Tobacco Control (FCTC). However, several structural and cultural factors represent substantial barriers to the policy process. The influence of transnational tobacco companies on policy processes in Russia has so far impeded a full implementation of the FCTC mandates.Several strategies have been identified as having the potential to reduce the prevalence of tobacco use in Russia and decrease tobacco-related national health and economic burden: adjusting national tobacco policy by raising tobacco tax from the current lowest level in Europe to at least 70%; consequent enforcement of a complete smoking ban in public places; marketing restrictions; and smoking cessation interventions integrated into primary care. Russia's tobacco control efforts need to target women and youths specifically to efficiently counter industry efforts.
Imaginário e envelhecimento: imagens simbólicas de três nonagenários
Migliorini, Walter José Martins;
Paidéia (Ribeir?o Preto) , 2010, DOI: 10.1590/S0103-863X2010000100011
Abstract: this is a hermeneutic essay on the symbolic images of nonagenarians aimed to investigate the prevailing structures of their imagery and psychic organization. stories, drawings, dreams, reveries and memories were collected during weekly open interviews and analyzed according to the theory of structures of imaginary by gilbert durand, who proposes a non-drive-based interpretation of symbols. the sampling criteria were: people older than ninety years, absence of arteriosclerotic senile dementia (being clinically healthy), social activity and voluntary participation. the results revealed the absence of a recurrent structure of imaginary, an exuberant symbolical imagination, permeability through contents related to memory and imagination in addition to creativity and vivid affective processes.
Biodiversity Indicators for Sustainability Evaluation of Conventional and Organic Agro-ecosystems
Paola Migliorini,Concetta Vazzana
Italian Journal of Agronomy , 2007, DOI: 10.4081/ija.2007.105
Abstract: Previous studies suggest widespread positive responses of biodiversity to organic farming. However, the effect of organic farming management on biodiversity over time needs to be better understood and this paper aims to compare agricultural biodiversity in a long-term experiment including three different agroecosystem management patterns (old organic, young organic and conventional). The level of agroecosystem sustainability related to plants has been assessed both for the structural and the associated biodiversity, using biodiversity Indicators. The data collected in three years (2003-2005) show that the system under organic agriculture management is better than conventional one for every indicator and it improves each aspect over the time. This trend holds especially for the associated biodiversity while the planned biodiversity can still be improved.
Biodiversity Indicators for Sustainability Evaluation of Conventional and Organic Agro-ecosystems
Paola Migliorini,Concetta Vazzana
Italian Journal of Agronomy , 2011, DOI: 10.4081/ija.2007.105
Abstract: Previous studies suggest widespread positive responses of biodiversity to organic farming. However, the effect of organic farming management on biodiversity over time needs to be better understood and this paper aims to compare agricultural biodiversity in a long-term experiment including three different agroecosystem management patterns (old organic, young organic and conventional). The level of agroecosystem sustainability related to plants has been assessed both for the structural and the associated biodiversity, using biodiversity Indicators. The data collected in three years (2003-2005) show that the system under organic agriculture management is better than conventional one for every indicator and it improves each aspect over the time. This trend holds especially for the associated biodiversity while the planned biodiversity can still be improved.
Finite-Connectivity Spin-Glass Phase Diagrams and Low Density Parity Check Codes
Gabriele Migliorini,David Saad
Physics , 2005, DOI: 10.1103/PhysRevE.73.026122
Abstract: We obtain phase diagrams of regular and irregular finite connectivity spin-glasses. Contact is firstly established between properties of the phase diagram and the performances of low density parity check codes (LDPC) within the Replica Symmetric (RS) ansatz. We then study the location of the dynamical and critical transition of these systems within the one step Replica Symmetry Breaking theory (RSB), extending similar calculations that have been performed in the past for the Bethe spin-glass problem. We observe that, away from the Nishimori line, in the low temperature region, the location of the dynamical transition line does change within the RSB theory, in comparison with the (RS) case. For LDPC decoding over the binary erasure channel we find, at zero temperature and rate R=1/4 an RS critical transition point located at p_c = 0.67 while the critical RSB transition point is located at p_c = 0.7450, to be compared with the corresponding Shannon bound 1-R. For the binary symmetric channel (BSC) we show that the low temperature reentrant behavior of the dynamical transition line, observed within the RS ansatz, changes within the RSB theory; the location of the dynamical transition point occurring at higher values of the channel noise. Possible practical implications to improve the performances of the state-of-the-art error correcting codes are discussed.
Dynamical Behaviour of Low Autocorrelation Models
Gabriele Migliorini,Felix Ritort
Physics , 1994, DOI: 10.1088/0305-4470/27/23/012
Abstract: We have investigated the nature of the dynamical behaviour in low autocorrelation binary sequences. These models do have a glass transition $T_G$ of a purely dynamical nature. Above the glass transition the dynamics is not fully ergodic and relaxation times diverge like a power law $\tau\sim (T-T_G)^{-\gamma}$ with $\gamma$ close to $2$. Approaching the glass transition the relaxation slows down in agreement with the first order nature of the dynamical transition. Below the glass transition the system exhibits aging phenomena like in disordered spin glasses. We propose the aging phenomena as a precise method to determine the glass transition and its first order nature.
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