scholarly journals Analysis of rough voice from a nonlinear dynamics point of view

1993 ◽  
Vol 94 (3) ◽  
pp. 1762-1762
Author(s):  
David A. Berry ◽  
Ingo R. Titze ◽  
Hanspeter Herzel
Keyword(s):  
Nonlinear Dynamics ◽  
Point Of View

Analysis of Vocal Disorders With Methods From Nonlinear Dynamics

1994 ◽  
Vol 37 (5) ◽  
pp. 1008-1019 ◽  
Author(s):  
Hanspeter Herzel ◽  
David Berry ◽  
Ingo R. Titze ◽  
Marwa Saleh
Keyword(s):  
Nonlinear Dynamics ◽  
Vocal Fold ◽  
Intimate Relationship ◽  
Point Of View ◽  
Nonlinear Phenomena ◽  
Voice Analysis ◽  
Physiological Mechanisms ◽  
Analysis Techniques ◽  
Vocal Fold Vibration ◽  
Basic Concepts

Several authors have recently demonstrated the intimate relationship between nonlinear dynamics and observations in vocal fold vibration (Herzel, 1993; Mende, Herzel, & Wermke, 1990; Titze, Baken, & Herzel, 1993). The aim of this paper is to analyze vocal disorders from a nonlinear dynamics point of view. Basic concepts and analysis techniques from nonlinear dynamics are reviewed and related to voice. The voices of several patients with vocal disorders are analyzed using traditional voice analysis techniques and methods from nonlinear dynamics. The two methods are shown to complement each other in many ways. Likely physiological mechanisms of the observed nonlinear phenomena are presented, and it is shown how much of the terminology in the literature describing rough voice can be unified within the framework of nonlinear dynamics.

scholarly journals Nonlinear dynamic approach to the analysis of memristor parameters instability

2020 ◽  
Vol 22 (4) ◽  
pp. 253-261
Author(s):  
I. V. Matyushkin
Keyword(s):  
Nonlinear Dynamics ◽  
Electrical Circuit ◽  
The State ◽  
Point Of View ◽  
Chemical System ◽  
Total Charge ◽  
Low Frequencies ◽  
Edge Of Chaos ◽  
Relationship Of ◽  
Physical And Chemical

A general set of ideas related to the memristors modeling is presented. The memristor is considered to be a partially ordered physical and chemical system that is within the “edge of chaos“ from the point of view of nonlinear dynamics. The logical and historical relationship of memristor physics, nonlinear dynamics, and neuromorphic systems is illustrated in the form of a scheme. We distinguish the nonlinearity into external ones, when we describe the behavior of an electrical circuit containing a memristor, and internal ones, which are caused by processes in filament region. As a simulation model, the attention is drawn to the connectionist approach, known in the theory of neural networks, but applicable to describe the evolution of the filament as the dynamics of a network of traps connected electrically and quantum-mechanically. The state of each trap is discrete, and it is called an “oscillator“. The applied meaning of the theory of coupled maps lattice is indicated. The high-density current through the filament can lead to the need to take into account both discrete processes (generation of traps) and continuous processes (inclusion of some constructions of solid body theory into the model).However, a compact model is further developed in which the state of such a network is aggregated to three phase variables: the length of the filament, its total charge, and the local temperature. Despite the apparent physical meaning, all variables have a formal character, which is usually inherent in the parameters of compact models. The model consists of one algebraic equation, two differential equations, and one integral connection equation, and is derived from the simplest Strukov’s model. Therefore, it uses the “window function” approach. It is indicated that, according to the Poincare—Bendixon theorem, this is sufficient to explain the instability of four key parameters (switching voltages and resistances ON/OFF) at a cycling of memristor. The Fourier spectra of the time series of these parameters are analyzed on a low sample of experimental data. The data are associated with the TiN/HfOx/Pt structure (0 < x < 2). A preliminary conclusion that requires further verification is the predominance of low frequencies and the stochasticity of occurrence ones.

scholarly journals Prognostication algorithms and predictability ranges of mass reproduction of harmful insects according to the method of nonliner dynamics

2020 ◽  
Vol 10 (1) ◽  
pp. 37-42
Author(s):  
S. V. Stankevych ◽  
Ye. M. Biletskyj ◽  
I. V. Zabrodina ◽  
M. D. Yevtushenko ◽  
H. V. Baidyk ◽  
...  
Keyword(s):  
Nonlinear Dynamics ◽  
Insect Pests ◽  
Plant Protection ◽  
Evolutionary Process ◽  
Point Of View ◽  
Optimal Decision ◽  
Theoretical Synthesis ◽  
Breeding Grounds ◽  
Mass Reproduction ◽  
The Many

The authors have analysed the theoretical possibilities of prognostication the dynamics in the number and mass reproduction of some species of harmful insects. A theoretical synthesis of the information on the regularities of the population dynamics of the most common insect pests of agricultural plants from the point of view of the methodology of nonlinear dynamics and synergetics has been done. Based on the past and present an analysis of the many-year dynamics in the number of the insect populations has been carried out and an attempt to develop the algorithms for prognostication the seasonal and annual changes in the number of the insects has been made. To do this the authors recommend a scenario-based method of prognostication and making decisions in plant protection. Using the phytosanitary monitoring they determine the beginning of the regular mass reproduction (the appearance of an aggravated rate) and then, based on the phytosanitary prognosis, an aggravation of the situation that has developed or is being developing on the farm, in the district or in the region is made; after that on the base of the short-term prognosis (signaling) it is recommended to make the optimal decision to protect a particular crop taking into account the economic threshold of harmfulness. According to the authors this approach, based on the methodology of nonlinear dynamics (synergetic paradigm), makes it possible to determine in advance the breeding grounds of the aggravated rates and make the optimal decisions in plant protection. The predicted scenario will not be a prognostication of the future, but the elements of an evolutionary process inherent in nature.

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

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