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Article
Analysis of a significant Forbush depression of solar cycles 24 and 25 (2008–2021)
Six large Forbush decrease (FD) events of solar cycles 24 and 25 from 2008 to 2021 were recorded from five neutron monitoring stations in Rome, Moscow, Fort smith, Oulu, and Thule around the world. These event...
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Article
DRKPCA-VBGMM: fault monitoring via dynamically-recursive kernel principal component analysis with variational Bayesian Gaussian mixture model
Fault monitoring plays a vital role in ensuring operating safety and product quality of industrial manufacturing processes. However, modern industrial processes are generally develo** towards the direction o...
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Article
A 4D hyperchaotic Lorenz-type system: zero-Hopf bifurcation, ultimate bound estimation, and its variable-order fractional network
In this paper, the complex dynamics of a newly proposed 4D hyperchaotic Lorenz-type system are studied. The sufficient conditions of the emergence of periodic solutions and the stability of them at bifurcation...
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Article
On the dynamical investigation and synchronization of variable-order fractional neural networks: the Hopfield-like neural network model
Since the variable-order fractional systems show more complex characteristics and more degrees of freedom due to time-varying fractional derivatives, we introduce a variable-order fractional Hopfield-like neur...
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Article
A mathematical model for SARS-CoV-2 in variable-order fractional derivative
A new coronavirus mathematical with hospitalization is considered with the consideration of the real cases from March 06, 2021 till the end of April 30, 2021. The essential mathematical results for the model a...
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Article
Impact of information intervention on stochastic hepatitis B model and its variable-order fractional network
This paper aims at analyzing the dynamical behavior of a SIR hepatitis B epidemic stochastic model via a novel approach by incorporating the effect of information interventions and random perturbations. Initia...
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Article
A study on fractional HBV model through singular and non-singular derivatives
The current study’s aim is to evaluate the dynamics of a Hepatitis B virus (HBV) model with the class of asymptomatic carriers using two different numerical algorithms and various values of the fractional-orde...
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Article
The Combined Effect of Al2O3 Nanofluid and Coiled Wire Inserts in a Flat-Plate Solar Collector on Heat Transfer, Thermal Efficiency and Environmental CO2 Characteristics
The present study experimentally investigated the thermal efficiency, collector area, weight, embodied energy, environmental CO2 emissions of Al2O3/water nanofluid flow in a flat-plate solar collector and with co...
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Article
Open AccessA neuro-swarming intelligent heuristic for second-order nonlinear Lane–Emden multi-pantograph delay differential system
The current study is related to present a novel neuro-swarming intelligent heuristic for nonlinear second-order Lane–Emden multi-pantograph delay differential (NSO-LE-MPDD) model by applying the approximation ...
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Article
Investigation of the effect of wall geometry change on thermal resistance, temperature uniformity and FOM of a micro-heatsink containing nanofluid flow
In this paper, the numerical study of the thermal efficiency of a micro-heatsink (MHS) with nanofluid flow of water and alumina has been done. The heatsink (HS) is designed to cool an electronic component. Fou...
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Article
Open AccessEuler equations for isentropic gas dynamics with general pressure law
In this work, we explore the limiting behavior of Riemann solutions to the Euler equations in isentropic gas dynamics with general pressure law. We demonstrate that in the distributional sense the delta wave o...
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Article
Open AccessA Novel Design of Morlet Wavelet to Solve the Dynamics of Nervous Stomach Nonlinear Model
The present study introduces a novel design of Morlet wavelet neural network (MWNN) models to solve a class of a nonlinear nervous stomach system represented with governing ODEs systems via three categories, t...
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Article
Predicting the maximum sunspot number and the associated geomagnetic activity indices \(aa\) and \(Ap\) for solar cycle 25
Over the last three solar cycles, the precursor method has proven to be a very reliable technique for forecasting ensuing solar cycles. In the present work, we have used the geomagnetic activity indices: ...
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Article
Enhancement of the performance of nonlinear vibration energy harvesters by exploiting secondary resonances in multi-frequency excitations
This study is concerned with utilizing secondary resonances in order to harvest energy from low-frequency excitations. Nonlinearities give rise to secondary resonances, which can potentially activate large-amp...
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Article
Study of F(T) gravity in the framework of the Tsallis holographic dark energy model
In the present study, a new f(T) modified gravity model is established using a Tsallis holographic dark energy model (THDE) with a Hubble cutoff. Assuming a power law scale factor we verified the growth of dark e...
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Article
Study of Entropy-Corrected Models Using Dark Energy in the Framework of a Complementary Gravitational Field
The dark energy (DE) model of a complementary gravitational field is used to address the entropy-corrected cosmological model. The dominant DE universe can originate from an indirect coupling between vacuum en...
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Article
Holographic dark energy models in LTB inhomogeneous universe
The holographic principle is investigated for the generalized Lemaitre–Tolman–Bondi (LTB) model of an inhomogeneous and an isotropic dark energy. The inhomogeneity is considered as spherically symmetric and lo...
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Article
Thermodynamics analysis of Ricci dark energy models in bouncing Universe
Ricci dark energy (RDE) model in the framework of bouncing Universe is considered. Both the interacting and the non-interacting cases of the Ricci model of dark energy have been studied. Expressions for import...
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Article
Behaviour of f(T) dark energy model in fractal cosmology
The f(T) modified gravity model is considered in the framework of fractal space-time. Assuming only the time has a fractal profile while the other spatial coordinates have their normal geometrical descriptions, t...
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Article
On the study of Ricci dark energy models with varying gravitational constant in Kaluza-Klein model
This paper is devoted to discuss the evolution of Ricci dark energy with variable gravitational constant in the Kaluza-Klein universe. We study both the non-interacting and interacting cases of Ricci dark ener...
