Chaotic Movements Research Articles

Post-flutter response of a flexible cantilever plate in low subsonic flows

Numerical simulations on the post-flutter response of a flexible cantilever plate are carried out by establishing a nonlinear aeroelastic model. The present study shows that chaotic movements may exist in the three-dimensional panel flutter problems in case of low subsonic flows. In the analysis, time traces, phase-plane plots, Poincare maps as well as power spectral densities are employed to identify the dynamic behavior of the system. It is observed that the plate undergoes period-1, period-3 and non-periodic motions with the increase of inflow velocity. The post-flutter behavior is dominated by both geometric and aerodynamic nonlinearities. Numerical results show that wingtip vortexes are in fact an important source of aerodynamic nonlinearities, which have not been fully studied before. The study also provides a criterion on how to choose a coupling strategy in the nonlinear aeroelastic simulation of a low-aspect-ratio flexible structure in low subsonic flows when the dominant nonlinear effect is different in the post-flutter response.

The ‘Jewish cardinal’? Aron Jean-Marie Lustiger (1926–2007)

Cardinal Aron Jean-Marie Lustiger died at the age of 80 in 2007. Archbishop of Paris from 1981 to 2005, he was a towering and controversial public figure, both within the Catholic church and in European society more broadly. Since his death, he has remained a subject of intense interest. This essay will analyse two films about him – the 2012 documentary Aron Jean-Marie Lustiger (Jean-Yves Fischbach) and the 2013 fiction film Le Métis de Dieu (Ilan Duran Cohen) – as prisms through which the thought, policies and achievements of Lustiger can be examined and assessed. Primarily a charismatic man of faith, Lustiger was also widely engaged with the history of his times. It will be argued that his personal trajectory, frequently through his own direct agency, offers insight into several crucial layers of the cultural and political history of France, including the Occupation years; the Jewish question; the post-war recovery and decolonisation processes; Franco-German reconciliation; the restructuring of the universities; the chaotic socio-political movements around 1968; the development of the European Union; and the complex transformations of church life since the Second Vatican Council with the concomitant shifts in the relations between church and state.

The role of bubble injection characteristics at incipient fluidization condition on the mixing of particles in a gas-solid fluidized bed at high operating pressures: A CFD-DPM approach

In the present paper, a numerical study is carried out to assess the influence of bubble injection characteristics on the mixing behavior in a 2-D gas-solid fluidized bed at high pressures. CFD-DPM method is applied to investigate the particles mixing and the Lacey mixing index (LMI) is used to indicate the value of mixing in a fluidized bed. Simulation results show that constant gas flow rate as small bubbles (i.e. the small injection duration time) results in a better overall particle mixing in low pressures, but the impact of the injection duration time on the particle mixing is suppressed at high pressures due to the increased particles chaotic movements. The mixing index in x and z directions at different pressures is also investigated. The results show that the difference between the mixing times in two directions decreases by increasing the operating pressure.

An investigation on the flow and heat transfer characteristics of nanofluids by nonequilibrium molecular dynamics simulations

ABSTRACTThe flow and heat transfer characteristics of nanofluids are investigated by nonequilibrium molecular dynamics simulations. Both the effect of chaotic movements of nanoparticle (CMN) on flow properties and its resulting heat transfer enhancement are analyzed. Results show that compared with the base fluid, the effective thermal conductivity of nanofluids is increased, and the increase ratio in the shear flow field is much higher than that in the zero-shear flow field. Based on the models built in this paper, the contributions of increased thermal conductivity and CMN to the heat transfer enhancement of nanofluids are 49.8–68.6% and 31.4–50.2%, respectively.

Understanding faecal attraction in roaches

![Graphic][1] Much of our common knowledge of cockroach behavior is gained in that brief interval between flicking on the kitchen light and racing to stomp on the little buggers. But the chaotic movements we observe while roaches scurry for their lives belies a far more interesting truth:

Predictability of equity returns during a financial crisis

ABSTRACTAn occurrence of a market crash or a financial crisis has long been considered a cause of market inefficiency. An inefficient market commonly implies return predictability and the existence of profitable opportunities for traders and speculators. Technical analysis has been a popular tool to identify predictable patterns in asset prices. The usefulness of a large universe of technical trading rules popularized in the existing literature on technical analysis is tested when they are applied to a set of equity markets that are generally considered developed and efficient during the two most recent periods of major financial turmoil: the 1997 Asian financial crisis and the 2008 global financial crisis. Three major statistical deficiencies that existing studies on return predictability are commonly criticized for – data snooping bias, nonsynchronicity bias and transaction costs – have been incorporated in the analysis. Technical trading rules are largely unable to yield abnormal excess returns over the passive benchmark after data snooping bias, nonsynchronous pricing and transaction costs are accounted for. Chaotic price movements typical for a volatile market during a financial crisis are likely to have an adverse effect on the performance of active trend chasing trading strategies.

Mathematic Model for Analysing the Dynamic Behavior of a Vehicle in the Field of Chaotic Movements

This paper presents a plane equivalent model of the vehicle and its mathematical model attached. The mathematical model is under a form of four differential equations system of order 1, in order to analyze the dynamic behaviour of the vehicle movement. Its goal is to determine the ranges of speed for that movement is stable or is unstable, or having chaotic character. The authors consider being necessary to know the conditions in which movements occur chaotic movements to avoid them through constructive or functional limitations. Speed ​​values ​​are identified for the behaviour of the system is placed in the quasiperiodic movements field or exceeding these movements trough chaos and are highlighted by the specific instruments: the trajectories in the phase plane, Poincare section and power spectra.

Биофизические модели патологического и постурального тремора

Real chaotic and stochastic analysis of the two movements (tremor was considered as involuntary
 movements and tapping - arbitrary) shows them as chaotic movements (involuntary on the results of the test,
 not by the presence of the target). The authors introduce new criteria for separating these two types of motion in
 the form of matrices of pairwise comparisons of samples tremorograms and tappingrams. Identifying differences
 between the concrete (obtained continuously, during the sequential measurement) that are compared in pairs in
 one subject groups was performed using the Wilcoxon test. The increase in the number of "common" pairs of
 samples of tappingrams compared to tremorograms demonstrates a partial increase of phase-matching due to the
 afferentation and engaging mental activity. This indicates the beginning of a shift from the chaotic regime to
 stochastic. The increase in common pairs of tapping may be possible due to the change in patterns of fluctuations.
 The authors propose a new calculation of quasi-attractors of these two types of movements that allow the
 identification of the differences in the physiological state of the subject. The concrete examples of the changes in
 the parameters of the matrices of paired comparisons and quasi-attractors are demonstrated. The authors present
 a method of analysis of autocorrelation functions when partitioning the interval (-1; 1) into four parts. Using the
 analysis of the density autocorrelation functions and tremorograms and tappingrams shows a significant difference
 between involuntary movements (tremor) and arbitrary movement (tapping).

Opsoclonus-myoclonus syndrome in adults: a report of two cases

Background: Opsoclonus-myoclonus syndrome (OMS) is a rare movement disorder characterized by chaotic multidirectional eye movements, myoclonus and less frequently cerebellar ataxia. OMS affects as few as 1 in 10,000,000 people per year. Case reports: We present two cases of female Caucasian patients aged 19 and 60 years respectively who developed OMS following a febrile illness. In both cases OMS starts with an acute flare-up of physical symptoms within days. The neurologic examination revealed opsoclonus, myoclonus and ataxia. Both women had normal magnetic resonance imaging of the brain. The results of routine laboratory tests were normal. In both cases, cerebrospinal fluid examinations was consistent with aseptic meningoencephalitis and showed cell-protein association (lymphocytic pleocytosis and protein elevation). The oligoclonal IgG band was negative. Cytomegalovirus, Epstein-Bar virus, Varicella-zoster virus, borrelia, coxsackie, enterovirus, streptococcal infection, syphilis, herpes simplex virus-1 and -2, human immunodeficiency virus or hepatitis were negative in the serological tests. The thyroid function tests, the tests for anti-nuclear and anti-neuronal antibodies were within normal limits. Malignancy was not detected on positron-emission tomography-CT. After therapies including a combination of intravenous methylprednisonolon, intravenous ceftriaxon, acyclovir and clonazepam, both patients gradually improved and had recovered. After a 12-month follow-up, both women had no neurological sequelae. We have obtained approval of both patients. Conclusion: OMS is associated with multiple etiologies. The most common etiologies are idiopathic, paraneoplastic and infectious disorders. OMS may occur in patients with aseptic brainstem encephalitis. The exact immunopathogenesis and pathophysiology of OMS are uncertain.

The general movement optimality score: a detailed assessment of general movements during preterm and term age.

To explore the appropriateness of applying a detailed assessment of general movements and characterize the relationship between global and detailed assessment. The analysis was based on 783 video recordings of 233 infants (154 males, 79 females) who had been videoed from 27 to 45 weeks postmenstrual age. Apart from assessing the global general movement categories (normal, poor repertoire, cramped-synchronized, or chaotic general movements), we scored the amplitude, speed, spatial range, proximal and distal rotations, onset and offset, tremulous and cramped components of the upper and lower extremities. Applying the optimality concept, the maximum general movement optimality score of 42 indicates the optimal performance. General movement optimality scores (GMOS) differentiated between normal general movements (median 39 [25-75th centile 37-41]), poor repertoire general movements (median 25 [22-29]), and cramped-synchronized general movements (median 12 [10-14]; p<0.01). The optimality score for chaotic general movements (mainly occurring at late preterm age) was similar to those for cramped-synchronized general movements (median 14 [12-17]). Short-lasting tremulous movements occurred from very preterm age (<32wks) to post-term age across all general movement categories, including normal general movements. The detailed score at post-term age was slightly lower compared to the scores at preterm and term age for both normal (p=0.02) and poor repertoire general movements (p<0.01). Further research might demonstrate that the GMOS provides a solid base for the prediction of improvement versus deterioration within an individual general movement trajectory.

Квазиаттракторы треморограмм испытуемых в условиях акустических воздействий

Complex biological systems demonstrate uninterrupted chaotic changer of every components xi of all system state x(t). There fundamental specificy is uninterrupted absent of it’s stationary regime forevery xi meany dx/dt≠0 and function distribution f(x) forevery number of xi for every patients and for all group of patients. For every statie state (like tremor) we can present the region of phase space like VG (quasiattractor) where (in VG) the vector x(t) present the chaotic movements. In fact, every homeostaz is equal to postural tremor or tepping hen it’s parameters creluds into quasiattractor volime. Now we demonstrate the stationary state (as regime) according to tremor or tepping. Their parameters xi indudes into some quasiattractor and we can present the evolution of tremor of patients when we can change their psichophysiological parameter under some external some external sound influence. Sound cam change the physiological parameters of human organism and as a result – the tremor parameters and it’s quasiatractor.

Harmony from chaos? Perceptual-motor delays enhance behavioral anticipation in social interaction.

Effective interpersonal coordination is fundamental to robust social interaction, and the ability to anticipate a coactor's behavior is essential for achieving this coordination. However, coordination research has focused on the behavioral synchrony that occurs between the simple periodic movements of coactors and, thus, little is known about the anticipation that occurs during complex, everyday interaction. Research on the dynamics of coupled neurons, human motor control, electrical circuits, and laser semiconductors universally demonstrates that small temporal feedback delays are necessary for the anticipation of chaotic events. We therefore investigated whether similar feedback delays would promote anticipatory behavior during social interaction. Results revealed that coactors were not only able to anticipate others' chaotic movements when experiencing small perceptual-motor delays, but also exhibited movement patterns of equivalent complexity. This suggests that such delays, including those within the human nervous system, may enhance, rather than hinder, the anticipatory processes that underlie successful social interaction.

Eye myoclonus: A rare manifestation of vitamin B12 deficiency

Abnormal movements including tremor and myoclonus have been described in patients with vitamin B12 deficiency before or upon initiation of treatment with vitamin B12. We report here a case of vitamin B12 deficiency in an infant who presented first with chaotic rotatory eye movements (myoclonus) followed by the appearance of tremors in the tongue, palate, upper and lower limbs. All the abnormal movements disappeared spontaneously within a period of six weeks. To our knowledge, this is the first report of vitamin B12 deficiency presenting with myoclonus in the eyes.

Extensão participativa para a sustentabilidade da pesca artesanal

O presente artigo consiste em uma proposta metodológica de projeto de extensão pesqueira participativa, coordenado por uma equipe do Programa de Engenharia de Produção da COPPE/UFRJ com ênfase na Gestão de Recursos Naturais, para a sustentabilidade da pesca artesanal marinha em uma região litorânea da costa Sudeste do Brasil. Tal metodologia proposta é interativa e desenvolve-se recursivamente, configurando-se mediante um assessoramento dialógico. Ela pressupõe ser todo o problema de extensão complexo, tornando imprescindíveis abordagens interdisciplinares e interativas para que os processos de resoluções de problemas do setor da pesca artesanal possam ser realizados pelo compartilhamento de conhecimentos marítimos científicos e tradicionais. Nesse sentido, sua abordagem é alternativa à concepção linear e antidialógica de extensionismo no Brasil que fora denunciada por Paulo Freire em sua obra seminal “Comunicação ou Extensão?”. Ela fundara a política de extensão pesqueira do governo brasileiro nas décadas de 60/70 do século passado cujos efeitos foram danosos aos ecossistemas costeiros, estuarinos e marinhos do país, afetando a produtividade deles e da própria pesca artesanal: rápida expansão urbana, crescimento desenfreado do turismo com desvalorização das culturas locais, localização de polos industriais, poluição, construção de estradas, falta de saneamento e outros. O objetivo deste artigo é disponibilizar um framework metodológico para projetos de extensão, apropriados à complexidade da pesca artesanal, caracterizada por intervenções multiespecíficas e associadas a padrões de regularidade dos ecossistemas marinhos cuja dinâmica possui alta incerteza com movimentos aleatórios e caóticos. Suas principais referências teóricas compreendem três perspectivas: (a) as implicações recíprocas entre teoria e prática da pesquisa-ação; (b) a essencialidade da comunicação e da linguagem nos instrumentos das metodologias participativas; (c) a gestão por processos em base comunitária de pescadores de pequena escala. Essas perspectivas, por sua vez, encontram-se fundamentadas teoricamente em dois campos de estudos interdisciplinares: a Etnociência e a Sociocognição.

Effect of chaotic movements of nanoparticles for nanofluid heat transfer augmentation by molecular dynamics simulation

Through Molecular Dynamics simulation, the chaotic movements of nanoparticles in base fluid are investigated. Based on the simulated results of translational and rotational velocities of nanoparticles, the effect of nanoparticle movements for heat transfer in nanofluids is discussed. Furthermore, the influence of nanoparticle movements for the base fluid is studied. The fluid near a nanoparticle is divided into three levels: (1) absorption layer, (2) rotating fluid, and (3) spherical existential space, or called rotating fluid element. And the microscopic structure of nanofluid which is composed of countless rotating fluid elements is proposed.

Shilnikov Chaos in Oscillators with Huygens Coupling

We consider van der Pol–Duffing oscillators coupled via a two-dimensional linear system, representing Huygens coupling. We demonstrate that two identical synchronized oscillators can have chaotic movements and exhibit Shilnikov chaos. We rigorously prove the existence of a homoclinic orbit of a saddle-focus and a symmetrical heteroclinic contour of two saddle-foci, leading to the appearance of chaos via the Shilnikov saddle-focus bifurcation. We also support our analytical results with numerical simulations, revealing the main signature of Shilnikov chaos, the coexistence of chaotic and regular attractors with riddled basins of attraction, including wild attractors.

Другой мир, другая наука, другие модели в описании Complexity

The understanding of very special systems of third type was created according to W.Weaver efforts. The new theory of chaos – self- organization was created last 40 years and was based on other understanding of stationary mode of third type of systems and its very specific chaotic behavior. The analog of the systems with physical system was discussed too. The third type of systems (opposite of deterministic and stochastic systems) was presented. It was discussed the principle distinguishes between dynamics of such system and traditional systems according to Heisenberg uncertainty principle. Traditional systems have certain and reproducible initial state of its system’s state vector and we can predict its future states. But in the third type of systems the authors have uncertain initial system state and uncertain vector states. It is a unique system which I.R. Prigogine in his famous article to the future generation determines as systems behind the science. The time for researching of such systems has come. For the modeling of biosystems, the authors propose method of quasi-attractor and define five special properties of complex systems. The main of it is connected with uninterrupted chaotic movements (glimmering property) of system’s vector in phase space of state and evolution of such system’s state vector in phase space of state. It was demonstrated that Heizenberg principle of uncertainty has special analog at theory of chaos – self organization. The botton boarder of the left side of inequality for the systems of third type the authors propose the value of quasiattractors, inside of it we chaos uninferrupled and chaotic movements of systems state vector. The value of quasiattractor determine like multiplication of coordinat x its speed dx/dt.

Стационарные режимы поведения сложных биосистем в рамках теории хаоса-самоорганизации

Traditional biological science (biophysics, systems analyses of biosystems) stationary mode of biosystems describes according to equation dx/dt=0 for the systems state vector x=x(t)=(x1, x2,…xm)T. But real biosystems demonstrated uninterrupted chaotic dynamics when dx/dt≠0 is always uninterrupted. The authors present two types of approaches to stationary mode investigation for biosystems. The first approach is based on the compartmental-cluster theory and the second approach is based on the theory of chaos-self-organization. The last is more convenient for real biosystems description because there are pragmatic results of its use. The compartmental-cluster approach may be used for real complex biosystems and the authors present some typical examples of such theory. The stationary mode of hierarchical neural networks were illustrated according to specific audi - analyzator. It was demonstrated that short intervals of tremogram demonstrate the real difference of distribution function parameters. As a result of such experiments – the classical statistics methods don’t usefulness for investigation of postural tremor. The tremogram, cardiogram, encephalogram are the systems of third type. The main idea consists of uninterrupted chaotic movements (glimmering property) of system’s vector in phase space of state and evolution of such system’s state vector in phase space of state. The glimmering property and evolution don’t have properties which can be modeled by traditional deterministic and stochastic approaches.

Adult-onset opsoclonus-myoclonus-ataxia syndrome as a manifestation of brazilian lyme disease-like syndrome: a case report and review of literature

Described in 1962, the opsoclonus-myoclonus-ataxia syndrome (OMAS) is a rare, neurologically debilitating disorder with distinct characteristics that may begin in childhood or adult life. Although many cases remain without etiological diagnosis, others are related to neoplasms and infectious diseases. We report a 41-year-old previously healthy male with an 8-day history of headache, vertigo, nausea, vomiting, and nystagmus. After a normal brain computed tomography and lymphocytic pleocytosis in cerebral spinal fluid (CSF), intravenous acyclovir therapy was initiated in the emergency room. On the third day of hospitalization, the diagnosis of OMAS was made based on the presence of chaotic and irregular eye movements, dysarthric speech, gait instability, generalized tremor, and myoclonic jerks. In the face of his neurological worsening, ampicillin followed by nonspecific immunotherapy (methylprednisolone and intravenous immunoglobulin) was prescribed, with mild clinical improvement. After a thorough laboratory workup, the definite diagnosis of neuroborreliosis was established and ceftriaxone (4 g/daily/3 wks) and doxycycline (200 mg/day/2 mo) was administered. Toward the end of the ceftriaxone regimen, the neurologic signs substantially improved. We believe this to be the first case description of OMAS as clinical presentation of Brazilian Lyme disease-like syndrome (Baggio-Yoshinari syndrome).

Opsoclonus Associated With Salmonellosis in a 6-Week-Old Infant

A 6-week-old male infant presented with 2 days of fever, emesis, and diarrhea, associated with episodic and chaotic rapid eye movements, determined to be opsoclonus. An electroencephalogram (EEG) obtained during the events was normal. He was treated empirically for meningitis, and an initial workup for neuroblastoma including urine homovanillic acid and vanillylmandelic acid levels, abdominal ultrasonography, and computed tomography (CT) of the chest, abdomen, and pelvis was negative. Stool and blood cultures were positive for Salmonella, and antibiotic regimen was adjusted appropriately. Over the next few days, his fever, emesis, and diarrhea subsided, and the opsoclonus resolved by hospital day 6. He was back to baseline by hospital day 9. Although there have been cases of parainfectious opsoclonus associated with Lyme disease, enterovirus, Streptococcus, and West Nile virus, this represents the first reported pediatric case of opsoclonus associated with salmonellosis. Only 2 such cases in adults have been reported in the literature.