Letteratura scientifica selezionata sul tema "Perturbation externe"
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Articoli di riviste sul tema "Perturbation externe"
Schuurman, F., M. G. Kleinhans e H. Middelkoop. "Network response to internal and external perturbations in large sand-bed braided rivers". Earth Surface Dynamics Discussions 3, n. 1 (27 marzo 2015): 197–250. http://dx.doi.org/10.5194/esurfd-3-197-2015.
Testo completoKazantsev, E. "Sensitivity of the attractor of the barotropic ocean model to external influences: approach by unstable periodic orbits". Nonlinear Processes in Geophysics 8, n. 4/5 (31 ottobre 2001): 281–300. http://dx.doi.org/10.5194/npg-8-281-2001.
Testo completoMa, Yan, Weiming Sun, Nanrun Zhou, Jiping He e Chaolin Ma. "Neurons in Primary Motor Cortex Encode External Perturbations during an Orientation Reaching Task". Brain Sciences 11, n. 9 (25 agosto 2021): 1125. http://dx.doi.org/10.3390/brainsci11091125.
Testo completoBorkowski, Rafał, e Michalina Błażkiewicz. "Postural Reactions to External Mediolateral Perturbations: A Review". Applied Sciences 13, n. 3 (29 gennaio 2023): 1696. http://dx.doi.org/10.3390/app13031696.
Testo completoTajali, Shirin, Mina Rouhani, Mohammad Mehravar, Hossein Negahban, Elham Sadati e Ali E. Oskouei. "Effects of External Perturbations on Anticipatory and Compensatory Postural Adjustments in Patients with Multiple Sclerosis and a Fall History". International Journal of MS Care 20, n. 4 (1 luglio 2018): 164–72. http://dx.doi.org/10.7224/1537-2073.2016-098.
Testo completoIvanov, N. V., A. M. Kakurin e S. V. Konovalov. "MAGNETIC ISLAND DYNAMICS UNDER EXTERNAL MAGNETIC PERTURBATION IN ROTATING RESISTIVE ITER PLASMA". Problems of Atomic Science and Technology, Ser. Thermonuclear Fusion 36, n. 2 (2013): 55–64. http://dx.doi.org/10.21517/0202-3822-2013-36-2-55-64.
Testo completoSharma, Himakshi, Bhabesh Chandra Deka e Pradip Kr Bhattacharyya. "Behavior of potential energy surface of C–X bonds in presence of solvent and external electric field: A DFT study". Journal of Theoretical and Computational Chemistry 15, n. 06 (settembre 2016): 1650051. http://dx.doi.org/10.1142/s0219633616500516.
Testo completoPetrov A.V., Chapalo I.E., Bisyarin M.A. e Kotov O.I. "Intermodal fiber interferometer based on broadband light source and optical spectrum analyzer for external perturbations measurement". Technical Physics Letters 48, n. 15 (2022): 7. http://dx.doi.org/10.21883/tpl.2022.15.53809.18968.
Testo completoBeretta, Victor Spiandor, Rodrigo Vitório, Priscila Nóbrega-Sousa, Núbia Ribeiro Conceição, Diego Orcioli-Silva, Marcelo Pinto Pereira e Lilian Teresa Bucken Gobbi. "Effect of Different Intensities of Transcranial Direct Current Stimulation on Postural Response to External Perturbation in Patients With Parkinson’s Disease". Neurorehabilitation and Neural Repair 34, n. 11 (1 ottobre 2020): 1009–19. http://dx.doi.org/10.1177/1545968320962513.
Testo completoSokolov, V. "Adaptive optimal robust stabilization of autoregressive plant under biased external disturbance". Proceedings of the Komi Science Centre of the Ural Division of the Russian Academy of Sciences, n. 5 (20 dicembre 2022): 20–27. http://dx.doi.org/10.19110/1994-5655-2022-5-20-27.
Testo completoTesi sul tema "Perturbation externe"
Rao, Guillaume. "Biomécanique de la coordination motrice : Modélisations et analyses en réponse à une perturbation interne ou externe". Phd thesis, Aix-Marseille Université, 2006. http://tel.archives-ouvertes.fr/tel-00908210.
Testo completoCorbeil, Philippe. "Études des mécanismes adaptatifs du maintien de l'équilibre orthostatique. Effets d'une fatigue musculaire, d'une douleur expérimentale et d'une perturbation externe". Thesis, Université Laval, 2003. http://www.theses.ulaval.ca/2003/21104/21104.pdf.
Testo completoCorbeil, Philippe. "Etude des mécanismes adaptatifs du maintien de l'équilibre orthostatique : effets d'une fatigue musculaire, d'une douleur expérimentale et d'une perturbation externe". Université Joseph Fourier (Grenoble), 2003. http://www.theses.fr/2003GRE10062.
Testo completoChatagnon, Thomas. "Standing balance recovery strategies following external perturbations : a multiscale approach with applications to dense crowds". Electronic Thesis or Diss., Université de Rennes (2023-....), 2023. http://www.theses.fr/2023URENE007.
Testo completoEvery year, several crowd accidents are reported around the world. These accidents can result in injuries and even fatalities. One of the triggering element of these accidents has been reported to result from falls associated with loss of standing balance in this dense crowd context. However, knowledge regarding human standing balance in dense crowd is very limited due the complex nature of this environment. In this thesis we proposed an experimental approach to study standing balance recovery of individuals following external perturbations in environments with different crowd density. In particular, as perturbation may occur from any direction in dense crowds we first study the reaction to single individuals to external perturbations arising from different directions. Based on the data collected during of this experiment, we were able to propose a method to predict participants’ recovery strategies following external perturbations based on kinematic information. Experiment involving multiple individuals were then considered. In particular, we study the effect of the crowd density on the initiation and the characteristics of recovery steps. Eventually, a novel experimental paradigm was proposed to study standing balance during real crowded events. This approach was then used within punk rock concert crowds. Results provided new insights regarding the physical interactions and recovery strategies observed in this context
Zhang, Lei. "Rapid motor responses to external perturbations during reaching movements". Diss., Ludwig-Maximilians-Universität München, 2015. http://nbn-resolving.de/urn:nbn:de:bvb:19-184803.
Testo completoBouattour, Jouda. "Etude des perturbations électromagnétiques externes et internes engendrées sur du matériel ferroviaire RATP". Paris 6, 1986. http://www.theses.fr/1986PA066200.
Testo completoPollock, Courtney L. "Motor control of response to external perturbations in people post-stroke". Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/51595.
Testo completoMedicine, Faculty of
Graduate
Beretta, Victor Spiandor [UNESP]. "Ajustes posturais sob perturbação externa em indivíduos com doença de Parkinson e neurologicamente sadios". Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151770.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Introdução: A manutenção da postura emprega mecanismos de controle preditivos e reativos. Indivíduos com doença de Parkinson (DP) apresentam declínio no controle postural, principalmente na presença de perturbações externas. O uso de informações adicionais sobre a perturbação postural parece ser eficiente para melhorar o controle postural de idosos neurologicamente sadios, porém, na DP ainda é pouco conhecido. Objetivos: a) comparar as respostas dos ajustes posturais preditivos e reativos em idosos neurologicamente sadios (GC) e com DP (Estudo 1); b) verificar o efeito do fornecimento de informações adicionais nos ajustes posturais preditivos e reativos (Estudo 2). Metodologia: Participaram do Estudo 1, 39 (19 com DP e 20 GC) e do Estudo 2, 36 (17 com DP e 19 GC) selecionados na comunidade. Os indivíduos ficaram em pé sobre um equipamento que provocou a perturbação pelo deslocamento da base de suporte com intensidade de 15 cm/s e deslocamento de 5 cm. A perturbação inesperada foi apenas a primeira tentativa e, posteriormente, foram realizadas mais 15 tentativas em que apenas 5 ocorreram a perturbação de maneira imprevisível para análise da habituação à tarefa (Estudo 1). Para o Estudo 2 foram realizadas 20 tentativas com o fornecimento de informações adicionais sobre a perturbação, visual, verbal e somatossensorial do músculo requerido. Os dados EMG e CoP na condição inesperada foram analisados por meio de ANOVA one-way e nas perturbações imprevisíveis (Estudo 1 e 2) por meio de ANOVAs two-way. Resultados: Na perturbação inesperada, os idosos com DP apresentaram maiores valores nos parâmetros da EMG e do CoP em relação ao GC. Na habituação à perturbação, os idosos com DP adaptaram os padrões nos ajustes posturais reativos de forma tardia quando comparados ao GC. Em relação ao efeito das informações adicionais no controle postural, os idosos com DP apresentaram menor oscilação do CoP nos ajustes posturais preditivos em todas as condições de informações quando comparados ao GC. Já o GC aumentou a oscilação do CoP nos ajustes preditivos, considerando as mesmas condições. Nos ajustes posturais reativos, ambos os grupos apresentaram efeitos positivos das informações verbais e somatossensoriais, diminuindo os parâmetros temporais, de amplitude da EMG e espaciais do CoP em relação ás tentativas sem o seu fornecimento ou com o as demais informações (sobre a perturbação e visual). Além disso, os idosos com DP apresentaram controle postural mais adequado quando fornecida informação somatossensorial em relação às demais informações. Por fim, apesar das alterações positivas nos ajustes reativos, os idosos com DP apresentaram maior coativação muscular e tempo para recuperar a posição estável em relação ao GC. Conclusão: Idosos com DP possuem pior controle postural em situações com perturbações externas inesperada e imprevisível, evidenciando alterações temporais, na amplitude da EMG e espaciais do CoP. Além disso, idosos neurologicamente sadios e com DP conseguem alterar os padrões dos ajustes posturais com a exposição de perturbações externas, porém, na DP essa habituação é mais atrasada. As informações adicionais somatossensoriais parecem ter efeito positivo no controle postural dos idosos, principalmente na DP, diminuindo os parâmetros EMG e do CoP nos ajustes preditivos e reativos.
Introduction: Predictive and reactive postural mechanisms are necessary to maintain the posture. Patients with Parkinson's disease (PD) have a decline in postural control, mainly when occur an external perturbation. The use of additional information about the postural perturbation seems to be efficient to improve the postural control of neurotypical older people, but in PD it is still unclear. Aims: a) To compare the predictive and reactive postural adjustments responses in the neurotypical older people (CG) and the PD patients (Study 1); b) To verify the effect of additional information on predictive and reactive postural adjustments (Study 2). Methods: Participated thirty-nine (19 with PD and 20 GC) in the Study 1 and 36 (17 with PD and 19 GC) in the Study 2, selected in the community. The individuals stood on equipment that caused the perturbation by the displacement of the support base with the velocity of 15 cm/s and the range of 5 cm. The unexpected perturbation was the first trial, and 15 trials were realized in which in just 5 occurred the unpredictably perturbation to analyze the habituation to the task (Study 1). In the Study 2, 20 trail were realized with the additional information about the perturbation characteristics, visual, verbal, and somatosensory of the required muscle. The EMG and CoP data in the unexpected condition were analyzed by ANOVA one-way and in the unpredictable perturbations (Study 1 and 2) by the ANOVAs two-way. Results: In the unexpected perturbation, the PD patients presented higher temporal, range of EMG and spatial of CoP in relation to the CG. For the habituation to the perturbation, the patients with PD adapted the patterns in the reactive postural adjustments of delayed form when compared to the GC. In relation to the effect of the additional information on postural control, the PD patients presented lower CoP oscillation in the predictive postural adjustments in all the information conditions when compared to the CG. The GC increased the CoP oscillation in the predictive adjustments, considering the same information conditions. Both groups presented positive effects of verbal and somatosensory information in the reactive postural adjustments, decreasing temporal, range of EMG and spatial parameters of CoP in relation to trial without the information or with other information (about perturbation and visual). In addition, the PD patients presented more adequate postural control when somatosensory information was provided in relation to the other information. Finally, despite of the improvement in the reactive adjustments, patients with PD have a greater muscular coactivation and time to recover the stable position in relation to the CG. Conclusion: Patients with PD have worse postural control in situations with unexpected and unpredictable external perturbation, evidencing changes in the temporal, range of EMG and spatial of CoP parameters. In addition, neurotypical older people and PD patients can change the patterns of postural adjustments with the exposure of external perturbation, but in PD this habituation is more delayed. Besides that, somatosensory information seems to have a positive effect on the postural control of the older people, mainly in the PD, decreasing the EMG and CoP parameters in the predictive and reactive postural adjustments.
FAPESP: 2016/00503-0
CNPq: 159381/2015-0
Cervantes, Chia Carlos Andres, e Weronika Maria Lewandowska. "Optical Characterization of Quantum-Dots-in-a-Well Infrared Photodetectors Under External Perturbations". Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1659.
Testo completoIn this project we have used Fourier transform infrared spectroscopy to study the photoresponse of two different types of quantum dot-in-a-well infrared photodetectors (DWELL QDIPs). The basic task was to compare the photoresponse of these two detectors, and to study the influence of external resonant laser pumping on the photoresponse. Series of measurements were done at 77K. In the first measurements we investigated the photoresponse for different applied voltages at 77K.
In a second run of experiments, we used a 1064 nm infrared semiconductor laser to resonantly
pump the fundamental transition of the quantum dots. The results show that by using this
additional illumination the photoresponse was dramatically increased by creating additional
charge carriers in the quantum dots. This could be used to increase the sensitivity of infrared
detectors based on QDs.
Keil, Julian [Verfasser]. "Use your illusion : audiovisual perception and external perturbation are influenced by oscillatory activity / Julian Keil". Konstanz : Bibliothek der Universität Konstanz, 2012. http://d-nb.info/1026012759/34.
Testo completoLibri sul tema "Perturbation externe"
Rainone, Corrado. Metastable Glassy States Under External Perturbations. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60423-7.
Testo completoRainone, Corrado. Metastable Glassy States Under External Perturbations: Monitoring the Effects of Compression and Shear-strain. Springer, 2017.
Cerca il testo completoRainone, Corrado. Metastable Glassy States Under External Perturbations: Monitoring the Effects of Compression and Shear-strain. Springer, 2018.
Cerca il testo completoPlume diagnostics of the RSRM static firings for the pressure perturbation studies. [Washington, D.C: National Aeronautics and Space Administration, 1995.
Cerca il testo completoBertola, Marco. Chain of matrices, loop equations, and topological recursion. A cura di Gernot Akemann, Jinho Baik e Philippe Di Francesco. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780198744191.013.16.
Testo completoTaylor, Kenneth A. Referring to the World. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780195144741.001.0001.
Testo completoLaunay, Jean-Pierre, e Michel Verdaguer. The localized electron: magnetic properties. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814597.003.0002.
Testo completoGlazov, M. M. Electron Spin Decoherence by Nuclei. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198807308.003.0007.
Testo completoCapitoli di libri sul tema "Perturbation externe"
Metral, E., G. Rumolo e W. Herr. "Impedance and Collective Effects". In Particle Physics Reference Library, 105–81. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34245-6_4.
Testo completoÁlvarez, Miguel Dovale. "Isolation from External Perturbations". In Optical Cavities for Optical Atomic Clocks, Atom Interferometry and Gravitational-Wave Detection, 63–89. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20863-9_3.
Testo completoKita, Takafumi. "Responses to External Perturbations". In Statistical Mechanics of Superconductivity, 159–74. Tokyo: Springer Japan, 2015. http://dx.doi.org/10.1007/978-4-431-55405-9_11.
Testo completoRainone, Corrado. "Introduction". In Metastable Glassy States Under External Perturbations, 1–18. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60423-7_1.
Testo completoRainone, Corrado. "From Supercooled Liquids to RFOT". In Metastable Glassy States Under External Perturbations, 19–47. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60423-7_2.
Testo completoRainone, Corrado. "Metastable Glasses". In Metastable Glassy States Under External Perturbations, 49–83. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60423-7_3.
Testo completoRainone, Corrado. "The State Following Construction". In Metastable Glassy States Under External Perturbations, 85–97. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60423-7_4.
Testo completoRainone, Corrado. "The Replica Symmetric Ansatz". In Metastable Glassy States Under External Perturbations, 99–125. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60423-7_5.
Testo completoRainone, Corrado. "The Full Replica Symmetry Breaking Ansatz". In Metastable Glassy States Under External Perturbations, 127–43. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60423-7_6.
Testo completoRainone, Corrado. "Numerics in the Mari-Kurchan Model". In Metastable Glassy States Under External Perturbations, 145–57. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60423-7_7.
Testo completoAtti di convegni sul tema "Perturbation externe"
Beldiman, Octavian, Linda G. Bushnell, Gregory C. Walsh, Hua O. Wang e Yiguang Hong. "Perturbations in Networked Control Systems". In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/dsc-24538.
Testo completoHahn, Steven R., e Aldo A. Ferri. "Effect of Large Structural Perturbations on Response of Structural-Acoustic Systems". In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0177.
Testo completoMcGehee, Clark C., Si Mohamed Sah e Brian P. Mann. "Refining the Method of Averaging for a More Accurate Analytical Approximation to the Behaviors of a Damped Pendulum". In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70202.
Testo completoLi, Hanlai, Bin Liu e Lin Ji. "System size resonance induced by external perturbation". In 2012 8th International Conference on Natural Computation (ICNC). IEEE, 2012. http://dx.doi.org/10.1109/icnc.2012.6234539.
Testo completoOkulov, A. Yu. "Spiral cold atomic ensemble under external perturbations." In Conference on Coherence and Quantum Optics. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/cqo.2019.th2a.5.
Testo completoBlouin, Vincent. "Treatment of Damping in Structural Redesign by Large Admissible Perturbations". In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0180.
Testo completoJaroszewicz, Leszek R., Idzi Merta e Aleksander Kiezun. "Fiber optic external perturbation sensor with ring-wedge photodetector". In Photonics China '98, a cura di Shanglian Huang, Kim D. Bennett e David A. Jackson. SPIE, 1998. http://dx.doi.org/10.1117/12.318214.
Testo completoXia, Guang-Qiong, Tao Deng e Zheng-Mao Wu. "Nonlinear dynamics of 1550nm VCSELs under external perturbations". In 2013 12th International Conference on Optical Communications and Networks (ICOCN). IEEE, 2013. http://dx.doi.org/10.1109/icocn.2013.6617203.
Testo completoDemyanov, D. N. "Analytical Synthesis of External Perturbation Observer for Bilinear Dynamic System". In 2018 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM). IEEE, 2018. http://dx.doi.org/10.1109/icieam.2018.8728795.
Testo completoZhang, Chaoning, Philipp Benz, Chenguo Lin, Adil Karjauv, Jing Wu e In So Kweon. "A Survey on Universal Adversarial Attack". In Thirtieth International Joint Conference on Artificial Intelligence {IJCAI-21}. California: International Joint Conferences on Artificial Intelligence Organization, 2021. http://dx.doi.org/10.24963/ijcai.2021/635.
Testo completoRapporti di organizzazioni sul tema "Perturbation externe"
Terry, M. R. Effects of an External Perturbation on a Cylindrical Spheromak. Office of Scientific and Technical Information (OSTI), maggio 2002. http://dx.doi.org/10.2172/15007468.
Testo completoPark, Jong-Kyu, Allen H. Boozer, Jonathan E. Menard, Stefan P. Gerhardt e Steve A. Sabbagh. Shielding of External Magnetic Perturbations By Torque In Rotating Tokamak Plasmas. Office of Scientific and Technical Information (OSTI), agosto 2009. http://dx.doi.org/10.2172/963532.
Testo completoFitzpatrick, R., e T. C. Hender. Effect of a static external magnetic perturbation on resistive mode stability in tokamaks. Office of Scientific and Technical Information (OSTI), marzo 1994. http://dx.doi.org/10.2172/10140470.
Testo completoOr, Dani, Shmulik Friedman e Jeanette Norton. Physical processes affecting microbial habitats and activity in unsaturated agricultural soils. United States Department of Agriculture, ottobre 2002. http://dx.doi.org/10.32747/2002.7587239.bard.
Testo completo