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Search Results: 1 - 10 of 461880 matches for " A Pinton "
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A pericentric inversion of chromosome 4 in pigs
A Ducos, A Pinton, A Séguéla, HM Berland, MF Blanc, A Darré, P Pinton, M Yerle, R Darré
Genetics Selection Evolution , 1997, DOI: 10.1186/1297-9686-29-3-383
Cytogenetic screening of a canadian pig breeding unit
G. Coppola,A. Pinton,D. Nicodemo,D. Di Berardino
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2007.1s.88
Abstract: A cytogenetic study was undertaken on the chromosomal makeup and breeding data of 29 boars housed in a Canadian pig farm. Blood cultures were made and chromosome spreads were examined, searching for carriers of chromosomal abnormalities. The investigation revealed that twenty-six individuals had a normal karyotype and 3 (10.3%) carried the following aberrations: (a) two 1/6 translocations in two - unrelated - individuals, (b) one reciprocal translocation rcp(10;13). The litter size of the two boars carrying the 1/6 translocation was, on average, 6.5 and 5.8, respectively. The mean size of the litter sired by the boar carrying the rcp(10;13) was 6.0. As compared with the average litter size (11.0) sired by the normal boars in the herd, the translocations described here seemed to be responsible for ~35% decrease in prolificacy.
The Hardy-Littlewood Lemma and the estimate of the $\dib$-Neumann problem in a general norm
Stefano Pinton
Mathematics , 2012,
Abstract: We prove a generalized Hardy-Littlewood lemma on a non-smooth domain in "$f$-norm" and give an application to a corresponding estimate for the $\dib$-Neumann problem by means of suitable weights.
Propagation at the vertex of a sector
Stefano Pinton
Mathematics , 2013,
Abstract: We discuss holomorphic extension across a boundary point in terms of sector property. The point is of infinite type and the sector is accordingly "cusped" at the vertex.
Assistolia durante ecocardiograma de estresse com dobutamina
Pinton, Rita;Haggi Fo, Hermínio;Lemke, Walmor;Fran?a Neto, Olimpio R.;
Arquivos Brasileiros de Cardiologia , 1998, DOI: 10.1590/S0066-782X1998000600010
Abstract: we report a case of cardiac asystole during dobutamine stress echocardiography in a 59 year-old woman presenting with chest pain and a positive treadmill test for ischemia. cardiac asystole was not associated with myocardial ischaemia and was probably related to a powerful cardioinhibitory reflex caused by dobutamine stimulation.
Assistolia durante ecocardiograma de estresse com dobutamina
Pinton Rita,Haggi Fo Hermínio,Lemke Walmor,Fran?a Neto Olimpio R.
Arquivos Brasileiros de Cardiologia , 1998,
Abstract: Caso de assistolia, durante a realiza o de ecocardiografia de estresse com dobutamina, em mulher de 59 anos, com queixa de dor precordial. A complica o n o foi associada com isquemia miocárdica e deve ter sido causada pela estimula o dos receptores cárdio-inibidores cardíacos à a o da dobutamina. A assistolia cardíaca foi revertida após administra o de atropina, sem seqüelas.
Intermittency of velocity time increments in turbulence
L. Chevillard,S. G. Roux,E. Leveque,N. Mordant,J. -F. Pinton,A. Arneodo
Physics , 2005, DOI: 10.1103/PhysRevLett.95.064501
Abstract: We analyze the statistics of turbulent velocity fluctuations in the time domain. Three cases are computed numerically and compared: (i) the time traces of Lagrangian fluid particles in a (3D) turbulent flow (referred to as the "dynamic" case); (ii) the time evolution of tracers advected by a frozen turbulent field (the "static" case), and (iii) the evolution in time of the velocity recorded at a fixed location in an evolving Eulerian velocity field, as it would be measured by a local probe (referred to as the "virtual probe" case). We observe that the static case and the virtual probe cases share many properties with Eulerian velocity statistics. The dynamic (Lagrangian) case is clearly different; it bears the signature of the global dynamics of the flow.
Numerical study of dynamo action at low magnetic Prandtl numbers
Y. Ponty,P. D. Mininni,D. C. Montgomery,J. -F. Pinton,H. Politano,A. Pouquet
Physics , 2004, DOI: 10.1103/PhysRevLett.94.164502
Abstract: We present a three--pronged numerical approach to the dynamo problem at low magnetic Prandtl numbers $P_M$. The difficulty of resolving a large range of scales is circumvented by combining Direct Numerical Simulations, a Lagrangian-averaged model, and Large-Eddy Simulations (LES). The flow is generated by the Taylor-Green forcing; it combines a well defined structure at large scales and turbulent fluctuations at small scales. Our main findings are: (i) dynamos are observed from $P_M=1$ down to $P_M=10^{-2}$; (ii) the critical magnetic Reynolds number increases sharply with $P_M^{-1}$ as turbulence sets in and then saturates; (iii) in the linear growth phase, the most unstable magnetic modes move to small scales as $P_M$ is decreased and a Kazantsev $k^{3/2}$ spectrum develops; then the dynamo grows at large scales and modifies the turbulent velocity fluctuations.
Long time correlations in Lagrangian dynamics: a key to intermittency in turbulence
N. Mordant,J. Delour,E. Leveque,A. Arneodo,J. -F. Pinton
Physics , 2002, DOI: 10.1103/PhysRevLett.89.254502
Abstract: New aspects of turbulence are uncovered if one considers flow motion from the perspective of a fluid particle (known as the Lagrangian approach) rather than in terms of a velocity field (the Eulerian viewpoint). Using a new experimental technique, based on the scattering of ultrasounds, we have obtained a direct measurement of particle velocities, resolved at all scales, in a fully turbulent flow. It enables us to approach intermittency in turbulence from a dynamical point of view and to analyze the Lagrangian velocity fluctuations in the framework of random walks. We find experimentally that the elementary steps in the 'walk' have random uncorrelated directions but a magnitude that is extremely long-range correlated in time. Theoretically, we study a Langevin equation that incorporates these features and we show that the resulting dynamics accounts for the observed one- and two-point statistical properties of the Lagrangian velocity fluctuations. Our approach connects the intermittent statistical nature of turbulence to the dynamics of the flow.
Lagrangian Velocity Statistics in Turbulent Flows: Effects of Dissipation
L. Chevillard,S. G. Roux,E. Leveque,N. Mordant,J. -F. Pinton,A. Arneodo
Physics , 2003, DOI: 10.1103/PhysRevLett.91.214502
Abstract: We use the multifractal formalism to describe the effects of dissipation on Lagrangian velocity statistics in turbulent flows. We analyze high Reynolds number experiments and direct numerical simulation (DNS) data. We show that this approach reproduces the shape evolution of velocity increment probability density functions (PDF) from Gaussian to stretched exponentials as the time lag decreases from integral to dissipative time scales. A quantitative understanding of the departure from scaling exhibited by the magnitude cumulants, early in the inertial range, is obtained with a free parameter function D(h) which plays the role of the singularity spectrum in the asymptotic limit of infinite Reynolds number. We observe that numerical and experimental data are accurately described by a unique quadratic D(h) spectrum which is found to extend from $h_{min} \approx 0.18$ to $h_{max} \approx 1$, as the signature of the highly intermittent nature of Lagrangian velocity fluctuations.
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