scholarly journals Calculation of a self-consistent, low frequency electrostatic field in toroidal geometry

1977 ◽  
Author(s):  
C. O. Beasley ◽  
H. K. Meier ◽  
W. I. van Rij ◽  
J. E. McCune
Keyword(s):  
Electrostatic Field ◽  
Low Frequency ◽  
Self Consistent ◽  
Toroidal Geometry

scholarly journals Calculation of a self-consistent, low frequency electrostatic field in the drift-kinetic approximation

1978 ◽  
Vol 20 (2) ◽  
pp. 115-126
Author(s):  
C O Beasley ◽  
J E McCune ◽  
H K Meier ◽  
W I van Rij
Keyword(s):  
Electrostatic Field ◽  
Low Frequency ◽  
Self Consistent

scholarly journals The duty cycle of radio galaxies revealed by LOFAR: remnant and restarted radio source populations in the Lockman Hole

2020 ◽  
Vol 496 (2) ◽  
pp. 1706-1717 ◽  
Author(s):  
Stanislav S Shabala ◽  
Nika Jurlin ◽  
Raffaella Morganti ◽  
Marisa Brienza ◽  
Martin J Hardcastle ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Radio Source ◽  
Low Frequency ◽  
Galactic Nuclei ◽  
Radio Jets ◽  
Modelling Analysis ◽  
Self Consistent ◽  
Large Populations ◽  
Source Populations ◽  
Lockman Hole

ABSTRACT Feedback from radio jets associated with active galactic nuclei (AGNs) plays a profound role in the evolution of galaxies. Kinetic power of these radio jets appears to show temporal variation, but the mechanism(s) responsible for this process are not yet clear. Recently, the LOw Frequency ARray (LOFAR) has uncovered large populations of active, remnant, and restarted radio jet populations. By focusing on LOFAR data in the Lockman Hole, in this work we use the Radio AGNs in Semi-Analytic Environments (RAiSE) dynamical model to present the first self-consistent modelling analysis of active, remnant, and restarted radio source populations. Consistent with other recent work, our models predict that remnant radio lobes fade quickly. Any high (>10 per cent) observed fraction of remnant and restarted sources therefore requires a dominant population of short-lived jets. We speculate that this could plausibly be provided by feedback-regulated accretion.

Excitation of low-frequency oscillations on water surface in electrostatic field

2010 ◽  
Vol 36 (6) ◽  
pp. 555-558 ◽  
Author(s):  
A. M. Orlov ◽  
I. O. Yavtushenko ◽  
M. V. Churilov
Keyword(s):  
Electrostatic Field ◽  
Water Surface ◽  
Low Frequency ◽  
Low Frequency Oscillations

scholarly journals Application of low-frequency electrostatic field in clinical practice

2021 ◽  
Vol 18 (3) ◽  
pp. 195-209
Author(s):  
Alexander G. Kulikov ◽  
Olga V. Yarustovskaya ◽  
Ekaterina V. Kuzovleva ◽  
Tatiana N. Zaitseva ◽  
Detelina B. Kulchitskaya ◽  
...  
Keyword(s):  
Clinical Practice ◽  
Electrostatic Field ◽  
Low Frequency ◽  
Clinical Observations

The purpose of the paper is to highlight the possibilities of using a low-frequency electrostatic field in clinical practice. On the basis of available literature data and their own clinical observations authors summarize information concerning various aspects of the use of low-frequency electrostatic field in clinical practice, and gives a description of this method of treatment.

scholarly journals Influence of Toroidal Flow on Stationary Density of Collisionless Plasmas

Fluids ◽  
2019 ◽  
Vol 4 (3) ◽  
pp. 172
Author(s):  
Elias Laribi ◽  
Shun Ogawa ◽  
Guilhem Dif-Pradalier ◽  
Alexei Vasiliev ◽  
Xavier Garbet and Xavier Leoncini
Keyword(s):  
Large Aspect Ratio ◽  
Density Profiles ◽  
Collisionless Plasmas ◽  
Self Consistent ◽  
Ratio Limit ◽  
Stationary Conditions ◽  
The Individual ◽  
The Given ◽  
Individual Particles ◽  
Toroidal Geometry

Starting from the given passive particle equilibrium particle cylindrical profiles, we built self-consistent stationary conditions of the Maxwell-Vlasov equation at thermodynamic equilibrium with non-flat density profiles. The solutions to the obtained equations are then discussed. It appears that the presence of an azimuthal (poloidal) flow in the plasma can ensure radial confinement, while the presence of a longitudinal (toroidal) flow can enhance greatly the confinement. Moreover in the global physically reasonable situation, we find that no unstable point can emerge in the effective integrable Hamiltonian of the individual particles, hinting at some stability of the confinement when considering a toroidal geometry in the large aspect ratio limit.

SHORT TERM EFFECTS OF LOW-FREQUENCY AND LOW INTENSITY ELECTROSTATIC FIELD IN PATIENTS WITH KNEE JOINT OSTEOARTHRITIS

2018 ◽  
Vol 28 (2) ◽  
pp. 547-551
Author(s):  
Galina Мratskova ◽  
Damyan Petrov ◽  
Nedko Dimitrov
Keyword(s):  
Knee Joint ◽  
Range Of Motion ◽  
Electrostatic Field ◽  
Clinical Symptoms ◽  
Low Frequency ◽  
Short Term ◽  
Low Intensity ◽  
Therapeutic Exercises ◽  
Reduction Of Pain ◽  
Short Term Effects

Introduction: Osteoarthritis (OA) is a widespread disease among adult population and is one of the major public health problems. OA is leading cause of disability the joints of lower limbs: knee and hip. As global life expectancy increases, it predicted that OA will be the leading cause of damage resulting in permanent disability. In cases of OA a reduction in cartilage tissue is observed, which is radiographically demonstrated by narrowing of the joint space and bone changes, osteophytes and subchondral bone sclerosis. However, a significant proportion of patients with radiological evidence of gonarthritis do not report joint pain. It is important to evaluate the changes occurring in the surrounding tissues. Muscle weakness of m. quadriceps femoris may occur before pain and impaired joint function. The development and application of new non-pharmacological methods in the rehabilitation of degenerative joint diseases is particularly important.Purpose: To establish the short-term therapeutic effects of treatment with Low-frequency and Low-intensive electrostatic field, applied through Deep Oscillation® method and complex of therapeutic exercises in rehabilitation of patients with osteoarthritis of the knee.Materials and methods: We conducted a one-year observational study involving 23 patients with clinical symptoms and radiologically proven II and III stage according Kellgren-Lawrence gonarthritis, aged between 42 and 78 years, were observed. 15 of them were women average age 61.73±12.9 years vs 8 - males average age 61.75±9.6 years (p=0.997). The duration of the current pain-episode was 1.7±0.7 months. The treatment was conducted in 10 sessions and included: Low-frequency and Low-intensity electrostatic field and complex therapeutic exercises.Results: The results were evaluated before and after completion of therapeutic course by assessing pain (VAS) at rest, when walking, climbing and descending on stairs, Manual Muscle Testing, Measurment of the knee joint circumference, Test Range of Motion and WOMAC Osteoarthritis Index, V.LK 3.1. were tracked. For processing statistical data SPSS v.13 was used. There was a statistically significant reduction of pain syndrome at rest (p<0.001), walking (p<0.001), descending stairs (p<0.001), climbing (p<0.001). Reduction of knee joint circumference (p<0.001). Increasing the range of flexion before Ме (Range) from 105º (90º-120º) versus 120º (100º-125º) after therapy. Reduced deficiency at an extension from 3.48 ± 4.38 before therapy to recovery of the extension. Improved total WOMAC Index (p<0.001), Stiffness (p<0.001) and Function (p<0.001).Conclusion: The short-term effects of the application of Low-frequency and Low-intensive electrostatic field in complex with therapeutic exercises show reduction of clinical symptoms and improvement of daily functional activity in patients with knee joint osteoarthritis. Reduction of pain of rest and physical activity (walking, descending and climbing stairs) is observed, oedema is reduced, joint range of motion increases, immediately after completion of the therapeutic course. Because of the small number of patients included in the study for better objectifying of the effects of the low-frequency and low-intensity electrostatic field, the studies should continue.

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