Possibility of effect of electric charge on the stability of current‐carrying high‐field superconductors

1982 ◽  
Vol 40 (2) ◽  
pp. 180-182
Author(s):  
M. Sugahara
Keyword(s):  
Electric Charge ◽  
High Field ◽  
The Stability

Dynamics of thin-shell wormholes with different cosmological models

2017 ◽  
Vol 26 (05) ◽  
pp. 1741007 ◽  
Author(s):  
Muhammad Sharif ◽  
Saadia Mumtaz
Keyword(s):  
Equation Of State ◽  
Electric Charge ◽  
General Equation ◽  
Thin Shell ◽  
Cosmological Models ◽  
Exotic Matter ◽  
Linear Perturbation ◽  
Stability Regions ◽  
Thin Shell Wormholes ◽  
The Stability

This work is devoted to investigate the stability of thin-shell wormholes in Einstein–Hoffmann–Born–Infeld electrodynamics. We also study the attractive and repulsive characteristics of these configurations. A general equation-of-state is considered in the form of linear perturbation which explores the stability of the respective wormhole solutions. We assume Chaplygin, linear and logarithmic gas models to study exotic matter at thin-shell and evaluate stability regions for different values of the involved parameters. It is concluded that the Hoffmann–Born–Infeld parameter and electric charge enhance the stability regions.

Dynamic High-Field MR Imaging in Experimental Porcine Acute Pancreatitis

1995 ◽  
Vol 36 (2) ◽  
pp. 182-187 ◽  
Author(s):  
A. Piironen ◽  
R. Kivisaari ◽  
P. Pitkäranta ◽  
V.-P. Poutanen ◽  
P. Laippala ◽  
...  
Keyword(s):  
Acute Pancreatitis ◽  
Mr Imaging ◽  
High Field ◽  
Spin Echo ◽  
Flip Angle ◽  
Significant Difference ◽  
Before And After ◽  
The Difference ◽  
The Stability ◽  
Signal Intensities

The effects of acute pancreatitis on MR imaging signal intensities (SIs) were determined in an experimental study at 1.0 T. Oedematous pancreatitis was induced in 9 piglets and haemorrhagic pancreatitis in 11 piglets. Each animal served as its own control for MR imaging before and after induction of pancreatitis. T1-weighted spin echo (450/15 ms) and dynamic turbo FLASH (flip angle 8°) sequences were used without contrast medium in testing the stability of the SI measurements. There was no significant difference in the SI-versus-time curves of the pancreas in piglets with oedematous and haemorrhagic pancreatitis. However, the difference in mean SIs between healthy and diseased piglets was significant. Thus, although non-contrast MR may be useful in the diagnosis of acute pancreatitis, it does not distinguish between oedematous and haemorrhagic pancreatitis.

Magnetic Levitation of Liquid Droplets

1998 ◽  
Vol 551 ◽  
Author(s):  
E. Beaugnon ◽  
R. Tournwer
Keyword(s):  
Magnetic Field ◽  
High Field ◽  
Magnetic Force ◽  
Magnetic Levitation ◽  
Superconducting Magnet ◽  
Numerical Calculations ◽  
Liquid Droplets ◽  
Energy Calculations ◽  
The Stability ◽  
The Magnetic Field

AbstractThe magnetic levitation of diamagnetic materials in a high field superconducting magnet is presented. The magnetic force is determined from numerical calculations of the magnetic field components and the stability of levitation is studied using energy calculations. Amongst the numerous materials that can be levitated, experiments are shown for ethanol droplets.

scholarly journals Influence of Si–In–Zn–O/Ag/Si–In–Zn–O Electrode on Amorphous Si–Zn–Sn–O Thin Film Transistors

2021 ◽  
Author(s):  
Jin Young Hwang ◽  
Sang Yeol Lee
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Field Effect ◽  
High Field ◽  
Metal Electrode ◽  
Negative Bias ◽  
Field Effect Mobility ◽  
Amorphous Si ◽  
Bias Temperature Stress ◽  
The Stability

AbstractAmorphous SiZnSnO (a-SZTO) thin film transistors (TFTs) have been reported with transparent Si–In–Zn–O/Ag/Si–In–Zn–O (SIZO OMO) source/drain (S/D) electrodes. The characteristics of ITO and SIZO OMO electrodes were compared with conventional metal electrode of Ti/Al. The SZTO TFT with SIZO OMO electrode showed high field effect mobility of 17.69 cm2/Vs, threshold voltage of 4.05 V and low sub-threshold swing of 0.33 V/decade. The stability of a-SZTO TFTs with SIZO OMO electrode was measured ∆VTH = 1.4 V at 333 K, and − 20 V for 7200 s under negative bias temperature stress (NBTS).

Parametric Oscillations and Stability of a Periodically Charged Liquid Droplet

1973 ◽  
Vol 51 (13) ◽  
pp. 1443-1445 ◽  
Author(s):  
G. N. Ionides
Keyword(s):  
Incompressible Fluid ◽  
Electric Charge ◽  
Liquid Droplet ◽  
Mathieu Equation ◽  
Parametric Oscillations ◽  
The Stability ◽  
Time Periodic ◽  
Constant Charge

The stability of an incompressible fluid droplet, carrying a time periodic electric charge, is considered. It is shown that this electrohydrodynamic problem is described by a Mathieu equation. As a result, the amplitude of the charge required to induce instability may be much smaller than in the corresponding case of a constant charge. The calculations are applicable to the dynamics of raindrops in electrified clouds.

Charged gravastars with cylindrical spacetime

2020 ◽  
Vol 35 (10) ◽  
pp. 2050069 ◽  
Author(s):  
M. Z. Bhatti
Keyword(s):  
Electric Charge ◽  
Equilibrium Condition ◽  
Thin Shell ◽  
Cylindrical Geometry ◽  
Matching Conditions ◽  
Linear Perturbations ◽  
The Stability

The objective of this work is to construct a gravastar model using thin-shell formalism and discuss its realistically accepted properties with the background of cylindrical metric. In this scenario, we matched the interior cylindrical geometry with exterior metric via Israel matching conditions. The stability of the constructed model under the influence of electric charge is then examined using linear perturbations around the equilibrium condition. We explored some stable regimes near the equilibrium condition with different values of charge as well as involved parameters.

scholarly journals Thin-Shell Wormholes in Einstein and Einstein–Gauss–Bonnet Theories of Gravity

Universe ◽  
2020 ◽  
Vol 6 (11) ◽  
pp. 197
Author(s):  
Takafumi Kokubu ◽  
Tomohiro Harada
Keyword(s):  
Cosmological Constant ◽  
Electric Charge ◽  
Thin Shell ◽  
De Sitter ◽  
Negative Cosmological Constant ◽  
Special Cases ◽  
Theories Of Gravity ◽  
Thin Shell Wormholes ◽  
Theory Of Gravitation ◽  
The Stability

We review recent works on the possibility for eternal existence of thin-shell wormholes on Einstein and Einstein–Gauss–Bonnet gravity. We introduce thin-shell wormholes that are categorized into a class of traversable wormhole solutions. After that, we discuss stable thin-shell wormholes with negative-tension branes in Reissner–Nordström–(anti) de Sitter spacetimes in d-dimensional Einstein gravity. Imposing Z2 symmetry, we construct and classify traversable static thin-shell wormholes in spherical, planar and hyperbolic symmetries. It is found that the spherical wormholes are stable against spherically symmetric perturbations. It is also found that some classes of wormholes in planar and hyperbolic symmetries with a negative cosmological constant are stable against perturbations preserving symmetries. In most cases, stable wormholes are found with the appropriate combination of an electric charge and a negative cosmological constant. However, as special cases, there are stable wormholes even with a vanishing cosmological constant in spherical symmetry and with a vanishing electric charge in hyperbolic symmetry. Subsequently, the existence and dynamical stability of traversable thin-shell wormholes with electrically neutral negative-tension branes is discussed in Einstein–Gauss–Bonnet theory of gravitation. We consider radial perturbations against the shell for the solutions, which have the Z2 symmetry. The effect of the Gauss–Bonnet term on the stability depends on the spacetime symmetry.

scholarly journals New solutions of exotic charged black holes and their stability

2016 ◽  
Vol 25 (03) ◽  
pp. 1650030 ◽  
Author(s):  
N. Farhangkhah
Keyword(s):  
Black Holes ◽  
Constant Curvature ◽  
Electric Charge ◽  
Weyl Tensor ◽  
Stable Phase ◽  
Thermodynamic Quantities ◽  
Third Order ◽  
Horizon Radius ◽  
Central Singularity ◽  
The Stability

We find a class of charged black hole solutions in third-order Lovelock Gravity. To obtain this class of solutions, we are not confined to the usual assumption of maximal symmetry on the horizon and will consider the solution whose boundary is Einstein space with supplementary conditions on its Weyl tensor. The Weyl tensor of such exotic horizons exposes two chargelike parameter to the solution. These parameters in addition with the electric charge, cause different features in comparison with the charged solution with constant-curvature horizon. For this class of asymptotically (A)dS solutions, the electric charge dominates the behavior of the metric as [Formula: see text] goes to zero, and thus the central singularity is always timelike. We also compute the thermodynamic quantities for these solutions and will show that the first law of thermodynamics is satisfied. We also show that the extreme black holes with nonconstant-curvature horizons whose Ricci scalar are zero or a positive constant could exist depending on the value of the electric charge and chargelike parameters. Finally, we investigate the stability of the black holes by analyzing the behavior of free energy and heat capacity specially in the limits of small and large horizon radius. We will show that in contrast with charged solution with constant-curvature horizon, a phase transition occurs between very small and small black holes from a stable phase to an unstable one, while the large black holes show stability to both perturbative and nonperturbative fluctuations.

scholarly journals Self-Interacting Electromagnetic Fields and a Classical Discussion on the Stability of the Electric Charge

2009 ◽  
Vol 48 (7) ◽  
pp. 1905-1911 ◽  
Author(s):  
S. O. Vellozo ◽  
J. A. Helayël Neto ◽  
A. W. Smith ◽  
L. P. G. De Assis
Keyword(s):  
Electromagnetic Fields ◽  
Electric Charge ◽  
The Stability

ESEM Hot Stage Evaluation of Sol-Gel Insulation Coatings for High Field HTS Magnets.

1997 ◽  
Vol 3 (S2) ◽  
pp. 607-608 ◽  
Author(s):  
I. H. Mutlu ◽  
R. E. Goddard ◽  
Y. S. Hascicek
Keyword(s):  
High Temperature ◽  
High Field ◽  
High Temperature Superconductors ◽  
Sol Gel ◽  
Chemical Route ◽  
Coating Method ◽  
Coating Characteristics ◽  
Excellent Adhesion ◽  
The Stability ◽  
Turn Insulation

High temperature, thin ceramic insulation coatings are necessary for the application of High Temperature Superconductors (HTS) in high field magnet technology. Especially in the so called “wind and react” technology, insulation coatings have to withstand the final heat treatment at about 900°C, otherwise turn to turn insulation will be broken. We have developed a sol-gel coating method for HTS tape conductors at NHMFL. Excellent adhesion at the interface due to the significant interfacial reactions, indicates that this sol-gel route is a feasible method for applying zirconia coatings. Sol-gel technology is a low temperature chemical route of preparing inorganic material. The stability and the coating characteristics of a organozirconium compound have been investigated to coat ZrO2 films on silver sheathed HTS tape conductors. This method was used to coat stainless steel with ZrO2.The ZrO2 coatings were obtained by dipping the silver sheathed HTS tape in a solution of zirconiumtetrabutoxide, isopropanol and acetylacetone.

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