TEMPORAL FLUCTUATIONS IN BIORHYTHMS: EXPRESSION OF SELF-ORGANIZED CRITICALITY?

Fractals ◽  
1993 ◽  
Vol 01 (03) ◽  
pp. 380-387 ◽  
Author(s):  
KLAUS-D. KNIFFKI ◽  
WOLFGANG MANDEL ◽  
PHUOC TRAN-GIA
Keyword(s):  
Point Process ◽  
Critical State ◽  
Degrees Of Freedom ◽  
Low Frequency ◽  
Well Being ◽  
Scale Invariant ◽  
Low Frequencies ◽  
Temporal Fluctuations ◽  
Self Organized ◽  
The Individual

Recently, a general organizing principle has been reported connecting 1/f-noise with the self-similar scale-invariant ‘fractal’ properties in space, hence reflecting two sides of a coin, the so-called self-organized critical state. The basic idea is that dynamical systems with many degrees of freedom operate persistently far from equilibrium at or near a threshold of stability at the border of chaos. Temporal fluctuations which cannot be explained as consequences of statistically independent random events are found in a variety of physical and biological phenomena. The fluctuations of these systems can be characterized by a power spectrum density S(f) decaying as f−b at low frequencies with an exponent b<1.5. We present a new approach to describe the individual biorhythm of humans using data from a colleague who has kept daily records for two years of his state of well-being applying a fifty-point magnitude category scale. This time series was described as a point process by introducing two discriminating rating levels R for the occurrence of R≥40 and R≤10. For b<1 a new method to estimate the low frequency part of S(f) was applied using counting statistics without applying Fast Fourier Transform. The method applied reliably discriminates these types of fluctuations from a random point process, with b=0.0. It is very tempting to speculate that the neural mechanisms at various levels of the nervous system underlying the perception of different values of the subjective state of well-being, are expressions of a self-organized critical state.

scholarly journals A seismic vertical vibrator driven by linear synchronous motors

Geophysics ◽  
2015 ◽  
Vol 80 (2) ◽  
pp. EN57-EN67 ◽  
Author(s):  
Rik Noorlandt ◽  
Guy Drijkoningen ◽  
Johan Dams ◽  
Rob Jenneskens
Keyword(s):  
Low Frequency ◽  
Field Tests ◽  
Seismic Source ◽  
Neutral Position ◽  
Low Frequencies ◽  
Synchronous Motors ◽  
Frequency Regime ◽  
Linear Synchronous Motors ◽  
Spring Mechanism ◽  
The Individual

A linear synchronous motor (LSM) is an electric motor that can produce large controllable forces and is therefore suitable as a driving engine for a seismic vibrator. This motor consists of two independent elements, a magnet track and a coil track, allowing practically unlimited motor displacements. This makes the LSM very suitable for expanding the source frequency band to the lower frequencies in which larger strokes are needed. In contrast to hydraulic engines, the LSM performs equally well over the whole frequency range, making possible a smaller amount of signal distortion, especially at the low frequencies. To find the feasibility of an LSM-driven vibrator, we successfully designed and built a multi-LSM prototype vibrator of some 1200 kg. We addressed the synchronization between the individual motor tracks and the different motors. To lower the energy consumption, a spring mechanism was implemented that delivered the force needed to lift the vibrator mass to its neutral position. The resonance belonging to this spring mechanism was successfully suppressed with the help of a position feedback control that also suppressed the temperature effects. The seismic data acquired in the field tests proved that the prototype LSM vibrator acted very well as a seismic source. It has no trouble generating pseudorandom sweeps, and even given its limited size, it generated signals within the low-frequency regime, down to 2 Hz, rather easily.

Bending Vibrations of the Femur and the Oscillatory Behavior of a Cemented Femoral Hip Endoprosthesis

2000 ◽  
Vol 122 (4) ◽  
pp. 416-422
Author(s):  
M. Thomsen ◽  
A. Go¨rtz ◽  
U. V. Na¨gerl ◽  
D. Kubein-Meesenburg ◽  
W. Go¨rtz ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Low Frequency ◽  
Oscillatory Behavior ◽  
Measuring System ◽  
Frequency Range ◽  
Entire Frequency Range ◽  
Bending Vibrations ◽  
Low Frequencies ◽  
Hip Endoprosthesis ◽  
Resonance Frequencies

The paper presents a novel method for recording amplitude and phase of 6D-vibrations of a spatial pendulum over a wide frequency range (10 Hz up to 20 kHz). The six degrees of freedom of the pendulum mass were monitored by three electrodynamic stereo pickups. At rest, the tips of the needles and the pendulum’s center of mass defined the reference system with respect to which the oscillations of the mass were recorded in terms of their amplitudes and phases. Its small dimensions, constant transfer characteristics, linearity, high dynamics, and virtual lack of reaction onto the moving system over the entire frequency range provided the advantages of the measuring system. This method was used to analyze the spatial 6D-vibrations of the head of a cemented femoral hip endoprosthesis when the femur was stimulated to bending vibrations. The head of the prosthesis carried out axial rotational vibrations at every frequency used to stimulate the femur. The amplitudes of the axial rotations of the cortical bone were small in comparison to the ones of the prosthesis head, indicating that axial rotational vibrations following femur bending vibrations mainly stressed the spongiosa and the cement layer. This was observed over the entire frequency range, including at the low frequencies relevant for gait. Over the low-frequency range, as well as at some of the higher resonance frequencies, stationary instantaneous helical axes characterized the vibrations. The measurements suggest the mechanism that the interface “implant-bone” may already be stressed by axial torsional loads when the femur is loaded by bending impacts that are known to occur during walking. [S0148-0731(00)01604-6]

scholarly journals THE DELOCALIZED EFFECTIVE DEGREES OF FREEDOM OF A BLACK HOLE AT LOW FREQUENCIES

2008 ◽  
Vol 17 (13n14) ◽  
pp. 2617-2624 ◽  
Author(s):  
BARAK KOL
Keyword(s):  
Field Theory ◽  
Black Hole ◽  
Effective Field Theory ◽  
Degrees Of Freedom ◽  
World Line ◽  
Low Frequency ◽  
Effective Field ◽  
Theory Approach ◽  
Low Frequencies ◽  
Long Wavelength

Identifying the fundamental degrees of freedom of a black hole poses a long-standing puzzle. Recently Goldberger and Rothstein forwarded a theory of the low frequency degrees of freedom within the effective field theory approach, where they are relevancy-ordered but of unclear physical origin. Here these degrees of freedom are identified with near-horizon but non-compact gravitational perturbations which are decomposed into delocalized multipoles. Their world-line (kinetic) action is determined within the classical effective field theory (CLEFT) approach and their interactions are discussed. The case of the long-wavelength scattering of a scalar wave off a Schwarzschild black hole is treated in some detail, interpreting within the CLEFT approach the equality of the leading absorption cross section with the horizon area.

The Dielectric Properties of Systems Containing Straight Polar Chains

1952 ◽  
Vol 5 (1) ◽  
pp. 135
Author(s):  
RA Sack
Keyword(s):  
Dielectric Properties ◽  
Low Frequency ◽  
Hydroxyl Groups ◽  
Total Moment ◽  
Low Frequencies ◽  
Elementary Transition ◽  
A Chain ◽  
The Individual ◽  
High Dielectric ◽  
Mathematical Derivation

A mathematical derivation is given of the dielectric properties of systems containing straight polar chains such that to each value of the total moment of a chain there corresponds only one arrangement of its dipoles. If the moments of the individual dipoles and the probability of an elementary transition are fixed, both the total dielectric loss and the effective relaxation time of the system increase in proportion to the square of the number of states of each chain. These conclusions are not valid for kinked chains and apply only qualitatively if the chains are branched. The theory provides an explanation for the high dielectric losses at low frequencies observed in many solids containing hydroxyl groups. It can further explain the low frequency absorption found in ionic crystals containing lattice imperfections ; in this interpretation the theory is related to Jaffe's theory of conductivity in polarizable media.

scholarly journals Individual Features in the Typology of the Nervous System and the Brain Activity Dynamics of Freestyle Wrestlers Exposed to a Strong Physical Activity (a Pilot Study)

2020 ◽  
Vol 10 (4) ◽  
pp. 79
Author(s):  
Irina Polikanova ◽  
Sergey Leonov ◽  
Aleksey Isaev ◽  
Liudmila Liutsko
Keyword(s):  
Nervous System ◽  
Brain Activity ◽  
Low Frequency ◽  
Well Being ◽  
Functional System ◽  
Moderate Increase ◽  
Sports Activity ◽  
Regulatory Systems ◽  
The Individual ◽  
Electroencephalogram Eeg

Nowadays, knowledge of psychophysiological features, particularly on the nervous system’s characteristics, is essential in the sporting context, particularly for freestyle wrestling. The study aimed to investigate the peculiarities of the wrestlers’ nervous system—on the individual and electrophysiological levels in two functional states—in calm wakefulness and during intense physical fatigue. Psychological (Well-being, Activity, Mood; Spielberger–Hanin; Leonhard’s questionnaires), as well as electrophysiological techniques (dynamics of the dominant and average frequencies of the main electroencephalogram (EEG) spectra—theta, alpha, low and high-frequency beta rhythms), were used in the study. It was shown that athletes were mainly characterized by the hyperthymic type of character accentuation and a low frequency of theta rhythm in a calm wakefulness state. After the acute physical load, wrestlers with high hyperthymia showed a moderate increase in theta, whereas other athletes showed a decrease in this parameter. Regardless of the level of hyperthymic accentuation, all wrestlers were characterized by an increase in the frequency of alpha rhythm after exercises in the left hemisphere. These results suggest the existence of a particular functional system in freestyle wrestlers, which allows the body’s regulatory systems to be adapted for the effective implementation of sports activity.

scholarly journals A 3 DOF Model for an Electromagnetic Air Mount

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
HyungTae Kim ◽  
CheolHo Kim ◽  
SungBok Kang ◽  
KangWon Lee ◽  
JaeHo Baek ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Low Frequency ◽  
Full Rank ◽  
Vertical Position ◽  
Air Spring ◽  
Pneumatic Chamber ◽  
Electro Magnetic ◽  
The Individual ◽  
Three Degrees Of Freedom ◽  
Surface Plate

A matrix model with three degrees of freedom is proposed as a means for controlling microvibrations and applied to an electromagnetic isolator. The model was derived from an assumption based on small- and low-frequency vibrations. The coordinates of the 3 DOF was composed of the 4 variables, representing a vertical position, pitch, roll, and a proof term. The coordinates were calculated from the 4 position sensors in the isolator and formulated into a matrix, which possesses inversive full rank. The electro-magnetic isolator was built for a simulated machine in semiconductor manufacturing and consisted of a heavy surface plate, sensors, amps, a controller, and air springs with electromagnets. The electromagnets are installed in a pneumatic chamber of the individual air spring. The performance of the 3 DOF model was experimented and compared with that of a 1 DOF model in an impact test. The settling time in the result was reduced to 25%.

Engaged Study of the Qur'an: Gauging its Effect on the Life of the Individual and of Society

2003 ◽  
Vol 5 (2) ◽  
pp. 202-207
Author(s):  
Ruqayya Ṭā Hā Jābir al-cUlwānī
Keyword(s):  
Social Conflict ◽  
Well Being ◽  
Arabic Language ◽  
Modern World ◽  
Educational Systems ◽  
Functional Perspective ◽  
Number Of Factors ◽  
Social Advancement ◽  
Freedom Of Thought ◽  
The Individual

An engaged and perceptive contemplation of the Qur'an forms one of the most important bases for the cultural and social advancement of Muslims in all walks of life, and the absence of such study is one of the reasons behind the general cultural attenuation in the modern world. Reflection is one of the means of the construction and formation of a civilised society. The applied faculty of intellect creates an environment which allows reflective and considered thought to be developed from a functional perspective for the general well-being of society. Meanwhile the effective neglect of such study leads to the proliferation of superstition, dissent and social conflict. Indeed it can even be argued that it diminishes the significance of the laws and conventions which serve as the backbone of society. This paper reveals a number of factors which can impede the achievement of such an engaged study of the text: thus, for instance, thoughtless obedience to societal conventions; shortcomings in educational systems and syllabi; and a failure to encompass the significance of the Arabic language. Furthermore this paper presents several effective suggestions for nurturing students' potential, encouraging an environment which allows freedom of thought, and its refinement.

The Chemical Effect in Medicine Interaction Determining the Form and Speed of Psychical Involution in the Prosthetic Restauration in the Edentulous

2018 ◽  
Vol 69 (8) ◽  
pp. 2306-2310
Author(s):  
Aureliana Caraiane ◽  
Razvan Leata ◽  
Veronica Toba ◽  
Doina Vesa ◽  
Luana Andreea Macovei ◽  
...  
Keyword(s):  
Practical Importance ◽  
Psychosocial Problems ◽  
Well Being ◽  
The Elderly ◽  
Chemical Effect ◽  
Special Importance ◽  
Dramatic Form ◽  
Specific Disorders ◽  
The Individual ◽  
Made In

The progress made in dentistry during the latest decades is due, conceptually, to the new, systemic vision of man, which has also taken place in this field of medicine. In this context, the link between organic and psychic is indestructible. Thus illness is understood as a drama in which the somatic process has a psychic value, and the mental one has a body value. It is known that the morphological and functional integrity of the dental system, health and vigorousness, gives the individual a state of well-being that affects his somatic and psychic health, as any disturbance at this level entails repercussions in psychological and social behavior. Such a disruption is the total edification that seriously alters not only the dental system but the whole organism, putting various biological and psychosocial problems to the practitioner. The total expression represents not only a physical disability but also a psychological one. A special importance in studying psychological changes at total edentulous presents the psychological aspects of senile involution. This is not only a theoretical but also a practical importance due to the increase in the number of elderly people. Through the researches of the present paper we intend to present the reality of the psychological manifestations in the total edentation, which is objectified on different methods of psychodiagnosis in the first part, in order for the second part to be addressed to problems of prosthetic psychotherapy.The study comprises a group of 43 patients, of whom 24 were men and 19 women with total uni or bimaxilar edentation. Total edentation can be and is responsible for somatopsychic alterations, along with other pathogens, general, local, social, which sometimes can take a dramatic form, converting, where the area is also favorable, a pure somatic disease, for those who are not in psychopathy or even psychosis, although these latter cases are extremely rare and especially in youngsters, which would disrupt not only the person�s behavior as an individual, but also their status, function and social integrity. The treatment of dental and psychological complex is mandatory for any patient, but especially for the elderly, where recovery is more difficult, with disease-specific disorders adding to those of senescence.

Temporal Focus

2020 ◽  
Author(s):  
Abbie J. Shipp
Keyword(s):  
Well Being ◽  
Psychology Research ◽  
The Past ◽  
Research Areas ◽  
The Future ◽  
Behavior Based ◽  
The Individual ◽  
And Behavior ◽  
Temporal Focus

Temporal focus is the individual tendency to characteristically think more or less about the past, present, and future. Although originally rooted in early work from psychology, research on temporal focus has been steadily growing in a number of research areas, particularly since Zimbardo and Boyd’s (1999) influential article on the topic. This chapter will review temporal focus research from the past to the present, including how temporal focus has been conceptualized and measured, and which correlates and outcomes have been tested in terms of well-being and behavior. Based on this review, an agenda for research is created to direct temporal focus research in the future.

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