Stability of bars of visco-elastic unstable material under random perturbations

1993 ◽  
Vol 57 (2) ◽  
pp. 337-343 ◽  
Author(s):  
V.D. Potapov
Keyword(s):  
Random Perturbations ◽  
Unstable Material

scholarly journals Extinction and persistence of a stochastic SIRV epidemic model with nonlinear incidence rate

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Ramziya Rifhat ◽  
Zhidong Teng ◽  
Chunxia Wang
Keyword(s):  
Epidemic Model ◽  
Control Strategies ◽  
Random Perturbations ◽  
Disease Dynamics ◽  
Nonlinear Incidence Rate ◽  
Nonlinear Incidence ◽  
Analysis Theory ◽  
Lyapunov Function Method ◽  
Random Fluctuations ◽  
Theoretical Results

AbstractIn this paper, a stochastic SIRV epidemic model with general nonlinear incidence and vaccination is investigated. The value of our study lies in two aspects. Mathematically, with the help of Lyapunov function method and stochastic analysis theory, we obtain a stochastic threshold of the model that completely determines the extinction and persistence of the epidemic. Epidemiologically, we find that random fluctuations can suppress disease outbreak, which can provide us some useful control strategies to regulate disease dynamics. In other words, neglecting random perturbations overestimates the ability of the disease to spread. The numerical simulations are given to illustrate the main theoretical results.

Advantages and Disadvantages of Nephelometric Measurement of Serum Lipids

1974 ◽  
Vol 20 (4) ◽  
pp. 502-504 ◽  
Author(s):  
Daniel M Baer
Keyword(s):  
Quality Control ◽  
Serum Lipids ◽  
Serum Triglyceride ◽  
Chemical Methods ◽  
Unstable Material ◽  
Advantages And Disadvantages ◽  
Control Procedures ◽  
Frequent Problem

Abstract Several technical difficulties diminish the usefulness of serum triglyceride estimation by the method of Stone and Thorp [Clin. Chim. Acta 14, 812 (1966)]. An artificial and somewhat unstable material is used in the standardization. Falsely elevated readings caused by scratched cuvettes are a frequent problem. Conventional quality-control procedures cannot be used because stable preparations are not available. Specimen stability is a greater problem than with conventional chemical methods. In spite of these difficulties, the method can be useful, if its limitations are recognized, in measurements made on nonfasting individuals.

scholarly journals Random perturbations of bifurcation diagrams

1994 ◽  
Vol 5 (3) ◽  
pp. 353-373 ◽  
Author(s):  
Fritz Colonius ◽  
Wolfgang Kliemann
Keyword(s):  
Random Perturbations ◽  
Bifurcation Diagrams

Cyclic Population Dynamics and Random Perturbations

10.2307/5728 ◽  
1996 ◽  
Vol 65 (2) ◽  
pp. 249 ◽  
Author(s):  
Veijo Kaitala ◽  
Esa Ranta ◽  
Jan Lindstrom
Keyword(s):  
Population Dynamics ◽  
Random Perturbations
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