In the present study, some perturbation methods are applied to Duffing equations having a displacement time-delayed variable to study the stability of such systems. Two approaches are considered to analyze Duffing oscillator having a strong delayed variable. The homotopy perturbation method is applied through the frequency analysis and nonlinear frequency is formulated as a function of all the ...

Data from a realistic model of the ocean, forced with observed atmospheric conditions for the period 1953– 92, are analyzed to determine the energetics of interannual variability in the tropical Pacific. The work done by the winds on the ocean, rather than generating kinetic energy, does work against pressure gradients and generates buoyancy power, which in turn is responsible for the rate of c...

In a smooth dynamical system, homoclinic connection is an orbit connecting saddle equilibrium to itself. Under perturbation, homoclinics are associated with bifurcations of periodic orbits, and chaos in higher dimensions. Homoclinic connections nonsmooth systems complicated by their interactions discontinuities vector fields. A may involve regular outside discontinuity set, or pseudo-saddle on ...

A high resolution, limited area version of the NCAR GCM is used to simulate the March 14, 1975 east coast storm. Based on climatological data, synoptic experience, and an examination of numerous cases, this cyclone was chosen because it seemed to have been strongly influenced by the Appalachian Mountains. The storm was investigated in detail and is briefly described. The NCAR GCM is also descri...

The propagation of pulses in ideal nonlinear optical fibers without loss is governed by the nonlinear Schrrdinger equation (NLS). When considering realistic fibers one must examine perturbed NLS equations, with the particular perturbation depending on the physical situation that is being modeled. A common example is the complex Ginzburg-Landau equation (CGL), which is a dissipative perturbation...

Objectives: To check and compare the effectiveness of modified agility and perturbation training over conventional physical therapy in patients with knee osteoarthritis. Methods: Subjects were screened on the basis of inclusion and exclusion criteria and a total of 50 subjects were recruited for the study. They were randomly divided into Group A and group B with n=25 each. Results: Group ...

The eruption of the Hunga Tonga–Hunga Ha’apai volcano on 15 January 2022 was first powerful explosive in history to be recorded with high quality by a wide range geophysical equipment. atmospheric Lamb wave caused explosion repeatedly circled Earth and served as one reasons for formation tsunami waves. In this paper, manifestations are analyzed recordings tsunamimeters, i.e., data from DONET DA...

Here, a new method called Aboodh transform homotopy perturbation method(ATHPM) is used to solve nonlinear partial dierential equations, we presenta reliable combination of homotopy perturbation method and Aboodh transformto investigate some nonlinear partial dierential equations. The nonlinearterms can be handled by the use of homotopy perturbation method. The resultsshow the eciency of this me...

objectives: to check and compare the effectiveness of modified agility and perturbation training over conventional physical therapy in patients with knee osteoarthritis. methods: subjects were screened on the basis of inclusion and exclusion criteria and a total of 50 subjects were recruited for the study. they were randomly divided into group a and group b with n=25 each. results: group receiv...