scholarly journals Production of unstable nuclei far from the stability line: its scope and limitations

1993 ◽  
Vol 80 (1-4) ◽  
pp. 1219-1238 ◽  
Author(s):  
K. Matsuta ◽  
A. Ozawa ◽  
Y. Nojiri ◽  
T. Minamisono ◽  
M. Fukuda ◽  
...  
Keyword(s):  
Unstable Nuclei ◽  
The Stability ◽  
Stability Line

Reduction of the neutron imaginary potential off the stability line and its possible impact on neutron capture rates

2021 ◽  
Vol 104 (1) ◽  
Author(s):  
A. V. Voinov ◽  
K. Brandenburg ◽  
C. R. Brune ◽  
R. Giri ◽  
S. M. Grimes ◽  
...  
Keyword(s):  
Neutron Capture ◽  
Imaginary Potential ◽  
The Stability ◽  
Capture Rates ◽  
Stability Line

KdV–Berger solution and local cluster effect of two-sided lateral gap continuum traffic flow model

2019 ◽  
Vol 33 (15) ◽  
pp. 1950153 ◽  
Author(s):  
Hari Krishna Gaddam ◽  
Asha Kumari Meena ◽  
K. Ramachandra Rao
Keyword(s):  
Traffic Flow ◽  
Density Wave ◽  
Traveling Wave Solutions ◽  
Neutral Stability ◽  
Local Cluster ◽  
Traffic Jams ◽  
Proposed Model ◽  
The Stability ◽  
Lateral Gaps ◽  
Stability Line

This study proposes a new nonlane-based continuum model derived from a two-sided lateral gap-following theory using the relation between microscopic and macroscopic variables. The model considers the effect of lateral gaps of the leading vehicles available on both sides of the following vehicle in multilane scenario. Linear stability analysis is performed to establish the neutral stability condition for the stable traffic flow. Nonlinear analysis is carried out at neutral stability line to derive the KdV–Berger equation, which describes density wave propagation. For that, one of the traveling wave solutions is also obtained. Numerical simulation results show that the two-sided lateral gap in the model improves the stability of the traffic flow by suppressing the traffic jams even at high-density conditions. The results implies that the proposed model is successful in replicating the properties of actual traffic jams in nonlane-based traffic environment.

Prediction of Thermoacoustic Vibration of Burner/Furnace Systems in Utility Boilers

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
Frantisek L. Eisinger ◽  
Robert E. Sullivan
Keyword(s):  
Heat Exchanger ◽  
Pressure Vessel ◽  
Axial Direction ◽  
Stability Diagram ◽  
Frequency Separation ◽  
Utility Boilers ◽  
The Stability ◽  
Thermoacoustic Oscillations ◽  
Stable Zone ◽  
Stability Line

Seven burner/furnace systems, three of which vibrated and four of which did not vibrate in operation are evaluated for thermoacoustic oscillations. The evaluation is based on the Rijke and Sondhauss models representing the combined burner/furnace (cold/hot) thermoacoustic systems. Frequency differences between the lowest vulnerable furnace acoustic frequencies in the burner axial direction and those of the systems’ Rijke and Sondhauss frequencies are evaluated to check for resonances. Most importantly, the stability of the Rijke and Sondhauss models is checked against the published design stability diagram of Eisinger (1999, “Eliminating Thermoacoustic Oscillations in Heat Exchanger and Steam Generator Systems,” ASME J. Pressure Vessel Technol., 121, pp. 444–452) and Eisinger and Sullivan (2002, “Avoiding Thermoacoustic Vibration in Burner/Furnace Systems,” ASME J. Pressure Vessel Technol., 124, pp. 418–424). It is shown that thermoacoustic oscillation can be well predicted by the published design stability diagram with the vibrating cases falling into the unstable zone above the stability line and the nonvibrating cases congregating in the stable zone below the stability line. The evaluation suggests that the primary criterion for predicting thermoacoustic oscillations is the stability of the thermoacoustic system and that frequency differences or resonances appear to play only a secondary role. It is concluded, however, that in conjunction with stability, the primary criterion, sufficient frequency separation shall also be maintained in the design process to preclude resonances. The paper provides sufficient details to aid the designers.

NUCLEAR HALO AND ITS SCALING LAWS IN THE EXCITED STATES OF NUCLEI NEAR THE β-STABILITY LINE

2008 ◽  
Vol 17 (supp01) ◽  
pp. 50-65
Author(s):  
J. G. CHEN ◽  
X. Z. CAI ◽  
Y. SHI ◽  
Y. G. MA ◽  
Z. Z. REN ◽  
...  
Keyword(s):  
Excited States ◽  
Scaling Laws ◽  
Mean Field ◽  
Binding Potential ◽  
Necessary Condition ◽  
Valence Nucleon ◽  
Relativistic Mean Field ◽  
Nuclear Halo ◽  
The Stability ◽  
Stability Line

The excited states of some odd A nuclei near the stability line have been systematically investigated from light to intermediate mass with the spherical relativistic mean field (RMF) model. The ratio between the valence nucleon root-mean-square (RMS) radius and the core rms radius, the separation energy and the density distribution have been deduced as signatures for halo or skin structure. We have presented the scaling laws of the ratio of valence particle rms radii and square-potential radii versus the scaled separation energies. The probability for a valence particle being out of the binding potential has also been extracted. We proposed a relaxed necessary condition for nuclear halo occurrence.

scholarly journals Supercritical behavior of magnetic and liquid model systems

2020 ◽  
Vol 27 (2) ◽  
pp. 37-42
Author(s):  
A. N. Galdina
Keyword(s):  
Point Of View ◽  
Model Systems ◽  
Thermal Equation ◽  
Supercritical Behavior ◽  
Transitions In Liquid Crystals ◽  
Liquid Model ◽  
Coexistence Line ◽  
Thermodynamic Forces ◽  
The Stability ◽  
Stability Line

The supercritical transitions are widely occurring. They include the supercritical transitions in the liquid-vapor system, ferromagnetic transitions, transitions in polymers, many transitions in liquid crystals, and some structural transitions. In the paper it is emphasized that the nature of the critical and supercritical transitions is the same – these are continuous fluctuation transitions. Above the critical temperature the system passes through a region of lowered stability, which leads to increase of fluctuations of energy and external parameters of the system. From the point of view of thermodynamic stability this indicates the existence of a continuous supercritical transition between supercritical  mesophases. Knowing the basic stability characteristics of a system, we derive the equation of these mesophase transitions. Depending on a thermal equation type, we can get one or several such equations, which may not coincide. This approves the fact that a supercritical transition occurs in a certain interval of thermodynamic forces. In the paper the relations between the critical exponents of thermodynamic parameters of the system are obtained and the conditions of continuous conjugation of the lowered stability line to subcritical coexistence line are investigated. The results are applied to the Curie–Weiss and van der Waals models: we obtain the quasi-spinodal equation for these systems and analyze the critical and supercritical behavior of the stability characteristics.

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