Hidden attractors in fundamental problems and engineering models

Recently a concept of self-excited and hidden attractors was suggested: an attractor is called a self-excited attractor if its basin of attraction overlaps with neighborhood of an equilibrium, otherwise it is called a hidden attractor. For example, hidden attractors are attractors in systems with no equilibria or with only one stable equilibrium (a special case of multistability and coexistence of attractors). While coexisting self-excited attractors can be found using the standard computational procedure, there is no standard way of predicting the existence or coexistence of hidden attractors in a system. In this plenary survey lecture the concept of self-excited and hidden attractors is discussed, and various corresponding examples of self-excited and hidden attractors are considered

Field effect transistor nanobiosensors: State-of-the-art and key challenges as point of care testing devices

The existing health care systems focus on treating diseases rather than preventing them. Patients are generally not testedunless physiological symptoms are appeared. When they do get tested, the results often take several days and can beinconclusive if the disease is at an early stage. In order to facilitate the diagnostics process and make tests more readilyavailable for patients, the concept of “point of care testing” (POCT) has been brought up and developed in recent years.Field effect transistors (FET) using nanomaterial as a kind of biosensors have shown great characteristics for detectionof a wide range of biomolecules due to their label-free, real time and ultrasensitive properties. In this paper, first of all,the working principles of such devices and recent developments in fabrication methods and surface functionalization arestated, and then some current research trends in field-effect transistor nanobiosensors are highlighted. Eventually keyadvantages and challenges of FET-based nanobiosensors as POCT devices are discussed as well

Neuroendocrine Abnormalities Following Traumatic Brain Injury: An Important Contributor to Neuropsychiatric Sequelae

Neuropsychiatric symptoms following traumatic brain injury (TBI) are common and contribute negatively to TBI outcomes by reducing overall quality of life. The development of neurobehavioral sequelae, such as concentration deficits, depression, anxiety, fatigue, and loss of emotional well-being has historically been attributed to an ambiguous “post-concussive syndrome,” considered secondary to frank structural injury and axonal damage. However, recent research suggests that neuroendocrine dysfunction, specifically hypopituitarism, plays an important role in the etiology of these symptoms. This post-head trauma hypopituitarism (PHTH) has been shown in the past two decades to be a clinically prevalent phenomenon, and given the parallels between neuropsychiatric symptoms associated with non-TBI-induced hypopituitarism and those following TBI, it is now acknowledged that PHTH is likely a substantial contributor to these impairments. The current paper seeks to provide an overview of hypothesized pathophysiological mechanisms underlying neuroendocrine abnormalities after TBI, and to emphasize the significance of this phenomenon in the development of the neurobehavioral problems frequently seen after head trauma

Spiral Bevel Gears: bifurcation and chaos analyses of pure torsional system - Data and codes

In the folder "MetaData", we stored the scripts and the data used to analyze and plot the figures of the results of all the simulations shown in the paper 'Spiral Bevel Gears: bifurcation and chaos analyses of a pure torsional system.' submitted to Journal of Chaos, Solitons, and Fractals by M. Molaie et al.The name of each subfolder is related to the results of the cases shown in the different parts of the paper.All data are structured in subfolders, and for each section, it is possible to replot the figures running the MATLAB '*.m' files contained in the subfolder; the '.m' files are ready to be run and are written with the relative paths for the data.Note that for the results of the Correlation Dimension and LLE, it is necessary to redo the simulation; also in this case, run the correspondent '.m' file.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

A multiple-intelligence approach to creativity in ESP courses

International audienc

Autofrettage of nonlinear strain-hardening cylinders using the proposed analytical solution for stresses

This paper focuses on pressurized thick-walled cylinders with nonlinear strain-hardening behavior. At first, a constitutive model is proposed to capture the test data done on the steel specimen. It is shown that this model is able to cover the various specific behaviors such as the perfect plastic, linear hardening, and nonlinear hardening behaviors. This constitutive model due to high performance in constitutive modeling and simplicity of its mathematical form is applied to pressurized thick-walled cylinders in order to find a closed-form analytical solution for their analysis. For this purpose, elasto-plastic stresses distribution in pressurized thick-walled cylinders made of a nonlinear strain-hardening material is obtained analytically for both loading and unloading phases using Tresca's yield criterion and considering the Bauschinger effect. Then, the solution is compared with experimental data and good agreement between predicted results and experimental data is observed. In the following, the residual stresses distribution are obtained to determine the best level of autofrettage for strengthening and design of these thick-walled cylinders prior to industrial use with the aim of increasing strength-to-weight ratio. It was observed that the parameters such as the material behavior (stress strain curve) and the Bauschinger effect have a significant influence on the results

Aborder la créativité en cours de langue de spécialité à travers les intelligences multiples

International audienceMany learning tasks favored by modern language teaching methods are believed to boost creativity, particularly if involving novel, learner-centered, problem-solving experiences. This article reports on a pilot study, which was carried out to investigate whether there is a relationship between implementing a creative use of the theory of multiple intelligences (MIT) in an English course and performance among learners. Sixty second-year science students were randomly chosen to form one experimental group (MIT-based teaching) and one control group (coursebook-based teaching). The results showed a significant correlation between using a creative MIT-based approach and English performance as reflected in students’ continuous assessment marks and students’ performance level observed in the classroom (reported in process-folios) and the final exam.Certaines tâches mises en place dans les méthodes modernes d’apprentissage des langues stimuleraient la créativité, particulièrement celles comportant des expériences inédites centrées sur les besoins des apprenants et celles encourageant la résolution de problèmes. Cet article s’appuie sur les résultats d’une étude préliminaire visant à explorer de possibles liens entre l’application créative de la TIM (théorie des intelligences multiples) en cours d’anglais et la performance en anglais des apprenants. Soixante étudiants en deuxième année d’études en sciences furent choisis au hasard pour former un groupe expérimental (cours basé sur la TIM) et un groupe contrôle (utilisant un livre de cours). Les résultats montrent une corrélation significative entre l’application créative de la TIM et le niveau de la performance des élèves en anglais, évalué par les notes de contrôle continu et leurs observations en classe (rapportées dans les dossiers d’apprentissage), et les notes d’examen de fin de semestre