Search results for "dynamique"
showing 10 items of 187 documents
Acute effects of static and dynamic stretching on the neuromuscular system
2019
Stretching is traditionally incorporated into pre-exercise routines in health, rehabilitation and sporting environments to condition the neuromuscular system for exercise. While a large body of evidence reported that stretching may acutely impair the subsequent muscular performance, some conflicting results highlight possible mitigating factors of neuromuscular responses variability. Because the limited data available do not present a clear consensus, the aim of this thesis was to investigate the effects of different factors on neuromuscular responses to stretch: the muscle group, the stretch duration and modality. By means of four studies, it has been shown that static stretching may alter…
Experimental study of Morris-Lecar neuron : design, coupling and interpretation
2015
We present in this manuscript an experimental electronic neuron based on complete Morris-Lecar model without simplifications, able to become an experimental unit tool to study collective association of robust coupled neurons. The circuit design is given in details according to the ionic currents of this model. The experimental results are compared with the theoretical prediction, leading to a good agreement between them, which therefore validates the circuit. We present the different areas according to the bifurcation control parameters, the membrane capacitance and the excitation current. We have highlighted the behavior of the neuron for each parameters zone. A coupling of such neurons is…
Evolutionary algorithm for fiber laser in ultrashort pulse regime
2016
This thesis deals with the generation of ultrashort pulses within a fiber laser cavity through the automatic optimization of its parameters by an evolutionary algorithm. The interest of this subject comes from the difficulty to systematically explore dynamics in a large domain of experimental parameters. We have shown that it is possible to implement an evolutionary algorithm on fiber laser cavity with appropriate precautions. We have experimentally demonstrated for the first time the mode locking of a laser cavity only using the optimization of polarization controllers through an automatic and self-learning procedure. We also have demonstrated that selecting the mode locking from it radio-…
Effects of mutations of wild-type alpha-synuclein on its structure and dimerization and consequences for the Parkinson's disease : answers from coars…
2022
Alpha-synuclein is a protein of 140 amino acids, intrinsically disordered and found abundantly in the brain and whose toxic aggregation there is the hallmark of the Parkinson's disease.The aim of the thesis is to understand the effects of certain mutations on the dimerization of alpha-synuclein and to contribute to understand its involvement in Parkinson's disease by using coarse-grained molecular dynamics. Coarse-grained molecular dynamics trajectories were computed using the UNited-RESidue (UNRES) program and provided unprecedented sampling (over an effective time of the order of milliseconds) of the alpha-synuclein structures in monomeric and dimeric forms. These data were generated both…
Dynamics of institutional and family ties of the child placed in foster care : the contribution of attachment theory and the psychodynamic approach
2019
This research studies dynamics of the institutional and family ties of the foster child with a complementary approach that articulates attachment theory and a psychodynamic perspective. METHODOLOGY. Through a mixed (quantitative and qualitative) and longitudinal (one year) methodology, the research was conducted with ten children (N=10) who have just arrived for the first time in foster care and professionals (N=17) who surround them. Tools used were the CCH, RQ, Ca-mir, Edicode (for attachment) and projective proofs of drawings with semi-structured clinical research interviews (for transfer and counter-transfer investments). RESULTS. Results show that children who have just arrived in fost…
Dynamiques de classe et efficacité scolaire
2003
The present research aims at describing the efficiency of teaching practices involved in dynamic "teaching-training" processes. Our main approach consisted in relating in-class-monitoring to the results of knowledge-acquisition by pupils so as to better explain through what means the pupils’ knowledge and competence are acquired. At a theoretical level this implies combining the "process-product" paradigm along with the "ecological" paradigm [ 1]. Results obtained indicate that bringing together the analysis of teaching practices with the evaluation of their impact "which are still limited to an exploratory stage" are a method well-worth pursuing. [ 1] See above the general introduction to …
Gériatrie : carrefour des souffrances
2021
Le travail des soignants en milieu gériatrique est particulièrement difficile. Ils sont en effet amenés à intervenir auprès de patients vulnérables et de plus en plus dépendants, afin de réaliser des actes techniques et de traitement de la maladie (le cure), mais aussi des soins de nature relationnelle (le care). Ce faisant, ils sont confrontés en permanence à la maladie et à la mort. Cette situation n'est évidemment pas neutre du point de vue psychologique, le travail en gériatrie étant à l'origine d'une importante souffrance au travail. Pourtant, cette souffrance ne se voit pas au premier abord, avant tout parce que les soignants en gériatrie ont élaboré des stratégies de défense dans le …
Génération et interfaçage de lumière à photon unique et contrôle de la dynamique atomique ultra-rapide pour l’information quantique
2010
We develop a robust and realistic mechanism for the generation of indistinguishable single-photon (SP) pulses with identical frequency and polarization. They are produced on demand from a coupled double-Raman atom-cavity system driven by a sequence of laser pump pulses. This scheme features a high efficiency, the ability to produce a sequence of narrow-band SP pulses with a delay determined only by the pump repetition rate, and simplicity of the system free from complications such as repumping process and environmental dephasing. We propose and analyze a simple scheme of parametric frequency conversion for optical quantum information in cold atomic ensembles. Its remarkable properties are m…
Asymptotic analysis of the form-factors of the quantum spin chains
2020
Since a long-time, the quantum integrable systems have remained an area where modern mathematical methods have given an access to interesting results in the study of physical systems. The exact computations, both numerical and asymptotic, of the correlation function is one of the most important subject of the theory of the quantum integrable models. In this context an approach based on the calculation of form factors has been proved to be a more effective one. In this thesis, we develop a new method based on the algebraic Bethe ansatz is proposed for the computation of the form-factors in thermodynamic limit. It is applied to and described in the context of isotropic XXX Heisenberg chain, w…
Contribution to the analysis of signals obtained by dynamic photon emission for the purpose of studying very large scale integration circuits
2014
Scaling progresses has the benefit of making chips always more powerful. On the other hand, when there is a failure, the analysis of such advanced devices has became more sensitive. The defect localization step of this process is the critical one. Indeed, the aim is to find transistors which dimensions range in several nanometers on a device which surface is several square centimeters.Optical techniques like dynamical photon emission, also named Time Resolved Imaging (TRI), have proved to fit in such context. The later is based on the acquisition and exploitation of photons emitted by a switching CMOS structure. Due to its physical bacground, this tool has a limited invasive effect and can …