Propagation of Weak Disturbances in a Gas Subject to Relaxation Effects

1960 ◽  
Vol 27 (2) ◽  
pp. 117-127 ◽  
Author(s):  
FRANKLIN K. MOORE ◽  
WALTER E. GIBSON
Keyword(s):  
Relaxation Effects ◽  
Weak Disturbances

RELAXATION EFFECTS IN Ba-La-Cu-O AND Sr-La-Cu-O

1987 ◽  
Vol 01 (03n04) ◽  
pp. 903-910 ◽  
Author(s):  
A.C. Mota ◽  
A. Pollini ◽  
P. Visani ◽  
K.A. Müller ◽  
J.G. Bednorz
Keyword(s):  
Relaxation Effects

N-acetylaspartate concentration in psychotic disorders: T2-relaxation effects

2021 ◽  
Vol 232 ◽  
pp. 42-44
Author(s):  
Elliot Kuan ◽  
Xi Chen ◽  
Fei Du ◽  
Dost Ongur
Keyword(s):  
Psychotic Disorders ◽  
T2 Relaxation ◽  
Relaxation Effects

On the theory of electrohydrodynamically driven capillary jets

1997 ◽  
Vol 335 ◽  
pp. 165-188 ◽  
Author(s):  
ALFONSO M. GAÑÁN-CALVO
Keyword(s):  
Surface Charge ◽  
Electric Fields ◽  
Gas Flow ◽  
Wave Speed ◽  
Propagation Speed ◽  
Field Equations ◽  
Steady Regime ◽  
One Dimensional ◽  
Relaxation Effects ◽  
Capillary Jets

Electrohydrodynamically (EHD) driven capillary jets are analysed in this work in the parametrical limit of negligible charge relaxation effects, i.e. when the electric relaxation time of the liquid is small compared to the hydrodynamic times. This regime can be found in the electrospraying of liquids when Taylor's charged capillary jets are formed in a steady regime. A quasi-one-dimensional EHD model comprising temporal balance equations of mass, momentum, charge, the capillary balance across the surface, and the inner and outer electric fields equations is presented. The steady forms of the temporal equations take into account surface charge convection as well as Ohmic bulk conduction, inner and outer electric field equations, momentum and pressure balances. Other existing models are also compared. The propagation speed of surface disturbances is obtained using classical techniques. It is shown here that, in contrast with previous models, surface charge convection provokes a difference between the upstream and the downstream wave speed values, the upstream wave speed, to some extent, being delayed. Subcritical, supercritical and convectively unstable regions are then identified. The supercritical nature of the microjets emitted from Taylor's cones is highlighted, and the point where the jet switches from a stable to a convectively unstable regime (i.e. where the propagation speed of perturbations become zero) is identified. The electric current carried by those jets is an eigenvalue of the problem, almost independent of the boundary conditions downstream, in an analogous way to the gas flow in convergent–divergent nozzles exiting into very low pressure. The EHD model is applied to an experiment and the relevant physical quantities of the phenomenon are obtained. The EHD hypotheses of the model are then checked and confirmed within the limits of the one-dimensional assumptions.

Relaxation Effects in the Magnetization of Chromic Methylamine Alum below Its Néel Point

1958 ◽  
Vol 110 (2) ◽  
pp. 332-336 ◽  
Author(s):  
C. W. Dempesy ◽  
R. C. Sapp
Keyword(s):  
Relaxation Effects

MODELLING OF DISSIPATION IN NUCLEAR FISSION

2004 ◽  
Vol 13 (01) ◽  
pp. 97-101
Author(s):  
C. SCHMITT ◽  
B. JURADO ◽  
A. R. JUNGHANS ◽  
K.-H. SCHMIDT ◽  
J. BENLLIURE
Keyword(s):  
Experimental Approach ◽  
Nuclear Fission ◽  
Heavy Ion ◽  
Analytical Approximation ◽  
Time Dependent ◽  
Relativistic Energy ◽  
Transient Effects ◽  
Ion Collisions ◽  
Relaxation Effects ◽  
Nuclear Dissipation

Peripheral heavy-ion collisions at relativistic energy are proposed as a new experimental approach dedicated to nuclear dissipation studies and, in particular, to investigate transient effects which are responsible for the inhibition of fission at the beginning of the process. To extract reliable information from the data, an analytical approximation of the time-dependent fission decay width is used in connection with new experimental signatures of relaxation effects.

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