In this paper, we have investigated the lifetime, mobility and effective mass of polaron and bipolaron in graphene under laser field by using the well-known Lee–Low–Pines transformations. In this study, it is seen that the laser affects mostly the dynamics parameters of polaron and bipolaron in graphene. We found that the laser reduces the lifetime of the polaron in the fundamental state and increases

In this work, we perform the Hamilton–Jacobi analysis of a modified gravity action, the so-called Freidel–Starodubtsev model. The complete set of involutive Hamiltonians that guarantee the system’s integrability is obtained. The generalized Poisson brackets are calculated in the metric phase by means of a suitable constraint matrix inversion. We also present a discussion about the metric and non-metric

The new frontier for spintronics is the realization of devices in which the spin can be controlled by electric fields. Multiferroics, materials exhibiting strong interplay between spin and orbital degrees of freedom, are candidates for the realization of such a paradigm. In this work, we study the magnetoelectric coupling in epitaxial \(\hbox {BiMnO}_3\) thin films which exhibit a large saturation

Predicting the behaviors of thermoelectric material, such as the Seebeck coefficient, using first-principle material properties will accelerate material design and selection to optimize the performance of thermoelectric generator. This paper presents an analytic framework for the Seebeck coefficient. Particularly, it elucidates the important contribution of chemical potential to the overall Seebeck

The aim of the present study is to solve the singular second-order functional differential model with the development of neuro-swarm intelligent computing solver ANN–PSO–SQP based on mathematical modeling of artificial neural networks (ANNs) optimized globally search efficacy of particle swarm optimization (PSO) aided with local search efficiency of sequential quadratic programming (SQP). In the scheme

The superposition of different statistics defines the concept of superstatistics, which makes an equilibrium statistical mechanics incorporate fluctuations. Herein, we study the thermodynamical properties of the anharmonic oscillator for Dirac equation in commutative and noncommutative (NC) spaces using q-deformed superstatistics. By employing the biconfluent Heun functions, the energy spectrum and

In this paper, the authors analyze the case study of the recovery of an orphan source of 60Co inside a maritime cargo full of metal wastes in the Italian Harbor of Genova carried out by the Italian Fire Fighters. Orphan radioactive sources or Radiological Dispersal Devices are a critical security issue in large geographical areas, and they result in a safety concern for people who may become accidentally

In this paper, we consider two separate Jaynes–Cummings (JC) nodes with a nonidentical qubit-field system in the presence of dissipation terms. We reveal the influence of the time variation of the coupling terms on some important measures when the qubits are immersed in a vacuum. The density matrix for the two qubits initially in Bell states are obtained. The dynamical behavior of the quantum discord

Recent article Revisiting the 2PN Pericenter Precession in View of Possible Future Measurements published by Iorio (Universe 6(4):53, 2020. https://doi.org/10.3390/universe6040053) argues that calculations of the secular 2PN precession of the orbital pericenter of a binary system accomplished by Damour and Schäfer (Nuovo Cim B Ser 101B(2):127–176, 1988. https://doi.org/10.1007/BF02828697) and Kopeikin

The quadratic convective flow of hybrid nanoliquid in an annulus subjected to quadratic thermal radiation is studied for the first time. The impact of suction/injection and the uniform movement of the rings are considered. Nonlinear equations are handled numerically by adopting the shooting technique. An optimization procedure is performed by using response surface methodology. The maximum heat transport

A specially prepared Si/He thin solid film was investigated as a suitable target for experimental studies on nuclear reactions involving \(^4\)He targets. For that purpose, the elastically scattered \(^4\)He recoil coming from the reaction \(^6\)Li + \(^4\)He at incident energy of 5.5 MeV was measured. The differential cross section of \(^6\)Li on \(^{4}\)He has been found to be fully consistent with

In high energy physics, graph-based implementations have the advantage of treating the input data sets in a similar way as they are collected by collider experiments. To expand on this concept, we propose a graph neural network enhanced by attention mechanisms called ABCNet. To exemplify the advantages and flexibility of treating collider data as a point cloud, two physically motivated problems are

Using the renormalization group (RG) theory and Monte Carlo simulation (MCS), the semi-infinite mixed spin-1/2 and spin-5/2 Blume–Capel system has been studied. Depending on the ratios (bulk–surface) R and D, four qualitative types of phase diagrams are determined and classified; each type is characterized by the presence or not of ordinary, extraordinary, surface and special phase transitions. To

Mechanism mixing graviton spin states is defined. The mixing appears naturally due to loop corrections. Its influence on amplitudes involving matter states is shown, and implications for empirical data are discussed. It is argued that the mixing is one of the reasons behind an inability to define the universal running of the Newton constant.

The most general Dirac Hamiltonians in \((1+1)\) dimensions are revisited under the requirement to exhibit a supersymmetric structure. It is found that supersymmetry allows either for a scalar or a pseudo-scalar potential. Their spectral properties are shown to be represented by those of the associated non-relativistic Witten model. The general discussion is extended to include the corresponding relativistic

The nature of the climate system is reviewed. We then review the history of scientific approaches to major problems in climate, noting that the centrality of the contribution of carbon dioxide is relatively recent, and probably inappropriate to much of the Earth’s climate history. The weakness of characterizing the overall climate behavior using only one physical process, globally averaged radiative

We study the quantum Hall effect inside a gravitational field. First, we review the influence of the gravitational field of the Earth on the quantum Hall effect. Taking the gravitational field of the Earth to be uniform along the vertical direction, we compute the affected quantized Hall resistivity. Then, we investigate how the gravitational field modifies the Landau levels of a particle moving between

We investigated electronic and structural properties of \(\hbox {C}_{{20}}\hbox {Li}\) nanowire by first-principle calculations. The optimum adsorption position of Li on \(\hbox {C}_{{20}}\) was found to be the bridge position by comparing the total energies of the adsorbed structures. We constructed \(\hbox {C}_{{20}}\hbox {Li}\) nanowire by using Li adsorbed on \(\hbox {C}_{{20}}\) at the bridge

The cosmic distance duality relation (CDDR), \(\eta (z)\equiv (1+z)^{-2}D_{\mathrm{{L}}}/D_{\mathrm{{A}}}=1\), plays a fundamental role in cosmology and astronomy since any violation of CDDR could be a signal of new physics. In this paper, we re-test the validity of CDDR by using the newest baryon acoustic oscillations (BAO) measurements from baryon oscillation spectroscopic survey data release 12

The paper focuses on applying the algebra of octonions to explore the influence of electric-charge gradients on the electric-current derivatives, revealing some of major influence factors of high pulse electric-currents. J. C. Maxwell was the first scholar to utilize the algebra of quaternions to study the physical properties of electromagnetic fields. The contemporary scholars employ simultaneously

This paper proposes a novel chaotic system characterized by a simple mathematical model and multiple coexisting attractors. Theoretical analysis and numerical simulation show that the proposed system is dissipative, symmetric, and chaotic. The system can generate a double-scroll chaotic attractor with having only one nonlinear term. With changing parameters, a double-scroll attractor is split into

We demonstrate the existence of localized states in close vicinity of a linear defect in graphene. These states have insulating or conducting character. Insulating states form a flat band, while conducting states present a slowdown of the group velocity which is not originated by many-body interactions and it is controlled by the interface properties. For appropriate boundary conditions, the conducting

The control of the quantum transport is an issue of current interest for the construction of new devices. In this work, we investigate this possibility in the realm of quantum graphs. The study allows the identification of two distinct periodic quantum effects which are related to quantum complexity, one being the identification of transport inefficiency, and the other the presence of peaks of full

The paper aims to explore the asymmetry of the muon content of non-vertical and very high-energy Monte Carlo showers due to the influence of Earth’s geomagnetic field. Simulations have shown that the geomagnetic field modifies the trajectories of muons in a shower producing a polar asymmetry in the density/number of positive and negative muons in the shower front plane. The asymmetry is quantified

We examine the induced spin velocity in case of the Earth. Spin velocity is induced from the conversion of a constrained spatial rotation into a spatial displacement. Its effects on Earth as a celestial body are consequences of its properties, and they are examined in detail. The induced spin velocity has influence on the semiannual variation of the length of day. The annual and semiannual variations

We present a revision of predictions for nuclear shadowing in deep-inelastic scattering at small Bjorken \(x_{Bj}\) corresponding to kinematic regions accessible by the future experiments at electron-ion colliders. The nuclear shadowing is treated within the color dipole formalism based on the rigorous Green function technique. This allows incorporating naturally color transparency and coherence length

A model based on population growth, chaotic maps, and turbulent flows is applied to the spread of Coronavirus for each Italian region in order to obtain useful information and help to contrast it. We divide the regions into different risk categories and discuss anomalies. The worst cases are confined between the Appenine and the Alps mountain ranges but the situation seem to improve closer to the sea

In the present work, we numerically investigate the optical properties of GaAs/AlxGa1−xAs Thue–Morse multiple-quantum-well systems (TM-MQWs) in the presence of an external electric field. We study the effects of the layers arrangements, total system length, number of layers and composition parameter x on the optical rectification coefficient of the TM-MQWs. We also consider three structural cases within

In this study, we suggest an effective method of the evaluation of HC and SS of real gases by using the FVC over Lennard-Jones (12-6) potential. As known, the determination of the FVC is a key step to correct evaluation of the thermal properties. As an example of application, the suggested method has been performed for gases of Ar, SF6 and SiH4. The obtained results of HC at constant pressure and SS

Impedance spectroscopy technique was used to characterize the electrical properties in a wide range of frequency [40–105 Hz] and temperature [80–700 K]. As a result, AC-conductivity spectrum follows the ‘double Jonscher Power Law’ in the temperature range [80–280 K], ‘Jonscher Power Law’ in [300–600 K] range and at 700 Kit is described by the classical Drude model. Moreover, the AC-conductivity analysis

Noncommutativity of position and momentum makes it difficult to formulate the unambiguous structure of the kinetic part of Hamiltonian for the position-dependent effective mass (PDEM). Various existing proposals of writing the viable kinetic part of the Hamiltonian for PDEM conceptually lack from first principle calculation. Starting from the first principle calculation, in this article, we have advocated

A theoretical method is used to calculate the radon exhalation and flux from the walls of a room and the soil to the living space in the room. The calculations are based on the Fick’s laws to describe the radon diffusion through the walls and in the soil. In both cases, the diffusion is considered as one-dimension along the direction to the inside of the room. Under some conditions, the three-dimensional

A numerical investigation on the nonlinear optical rectification, second and third harmonic generation coefficients in asymmetric double n-type \(\delta \)-doped GaAs quantum well is performed in order to identify the influence of non-resonant intense laser radiation, doping concentration and the change in well widths. The energy eigenvalues and the corresponding eigenfunctions are determined by using

The production of 99Mo, 131I, and 133Xe radionuclides is very important for consumption in the field of nuclear medicine. Generally, the use of small core reactors is recommended for the production of large-scale these fission radionuclides. In this paper, we have considered three different core loading patterns of Tehran Research Reactor for the economic and optimum production of 99Mo, 131I and 133Xe

We study the possibility of constructing thin-shell wormhole (TSW) in a particular \(f\left( R\right) \)-gravity model with nonconstant Ricci scalar and coupled minimally with nonlinear electromagnetic fields. In doing so, first we give a new static spherically symmetric solution of the theory. Then we apply the cut-and-paste method to construct the TSW. As \(f^{\prime \prime \prime }\left( R\right)

This paper studies nonlinear dynamic characteristics of a nonlocal two-phase piezo-magnetic beam based on a refined higher-order beam formulation and piezoelectric reinforcement scheme. The piezoelectric reinforcement can cause an enhanced vibration behavior of smart nanobeams under magnetic field. Nonlinear governing equations of a smart nanobeam are derived based on refined beam theory, and a numerical

Cosmic radiation in aviation has been a subject of real concern for decades, and measurements have been performed by many governments, airlines companies, and scientists for several years. In addition, the International Commission on Radiological Protection (ICRP) reports on cosmic radiation in aviation provided updated guidance on how to view and to protect the exposure of aircraft crew and astronauts

Abstract The high volatility liquids in industrial production are easily vaporized and diffuses into the workplace, posing a hazard. The volatility liquid gas–liquid mass transfer rate is calculated based on the mass loss measured in experiments. In this paper, the relation between the gas–liquid mass transfer rate and the liquid temperature and air flow rate above the liquid is analysed. Based on

The issue of the distillation of actionable climate change information for application to vulnerability, impacts and adaptation studies in support of climate service activities (or VIA-CS) at regional to local scales is revisited. The 3R approach is introduced: robustness, reliability and relevance. Climate information for regions needs to be robust in the sense of producing statistically significant

The cooling capability of heat sinks is important for a central processing unit (CPU). In this work, simulation has been done to investigate heat transfer (HT) in a heat sink (HS) mounted on the circular cylinder chip of a CPU that is studied and to explore the thermofluid behavior of the designed micro-pin-fin heat sink (MPFHS). Air cooling methods are used for heat extraction. This numerical work

Ionizing radiations are being widely used in a variety of medical and industrial applications in which the exact determination of the absorbed dose distribution is of crucial importance. Digital holographic interferometry (DHI) is an optical technique that uses lasers to produce fringe patterns which must be reconstructed to measure the physical quantities of interest. The DHI technique is sensitive

In nuclear reactor analysis, a relevant challenge is to achieve a suitable global description of nuclear systems through the coupling between neutronics and thermal hydraulics. Indeed, a multi-physics approach improves the reactor safety analysis and the design of different types of nuclear systems; in addition, it allows the investigation of physical effects at different scales of time and space.

In this paper, a new and an efficient solution method based on local gradient smoothing method has been applied to free vibration problem of open composite laminated cylindrical and conical shells with elastic boundary conditions. The theoretical model is formulated by the first-order shear deformation theory, and the motion equation is obtained by the Hamilton’s principle. The motion equation is discretized

We establish the extended BRST and anti-BRST transformations for non-Abelian relativistic self-dual Chern–Simons theory coupled to scalar fields within the Batalin–Vilkovisky framework. Based on these constructions, we describe the total effective extended BRST-invariant Lagrangian density of the coupling theory by means of superfields with one Grassmann coordinates. Moreover, we need two fermionic

In the present paper, the thermodynamics of three-dimensional impurity magnetopolaron under strong parabolic potential is investigated. To this aim, we first analytically solved the Schrodinger equation to have the complete energy spectrum in the presence of spin–orbit interaction. We equally use the canonical ensemble approach to obtain the partition function before calculating the thermodynamic parameters

We use different combinations of data samples to investigate the new generalized Chaplygin gas (NGCG) model in the context of dark energy (DE) cosmology. Using the available cosmological data, we put constraints on the the free parameters of NGCG model based on the statistical Markov chain Monte Carlo method. We then find the best fit values of cosmological parameters and those confidence regions in

Tagged neutron-based experimental system has been developed with a laboratory D-T neutron generator at BARC. The system can identify the C, N, O elemental signatures from an interrogated object (explosive or benign) using the Associated Particle Technique (also known as tagged neutron method) employing alpha–gamma coincidence and time-of-flight methodology. The system consists of a matrix of 64-pixel

This mathematical structure is modeled to explore the magnetic dipole and thermal radiation effects on the magnetically driven squashed flow of a ferrofluid. The flow is subjected to a Darcy–Forchheimer sensor medium placed in superficially free stream. Squashed flow in sensor surface is characterized by Darcy–Forchheimer relation. The fluid viscosity and thermic conductivity are presumed to be vary

Abstract The non-cytolytic cure of infected cells is an imperative mechanism that maintains the healthy state in the host body by reducing the level of infection. The primary purpose of humoral immune response, i.e., the B cell response, is to neutralize the extracellular virions present in the body. To explore the impact of infected cells and virus particle-mediated saturation response on the viral

We analyse the dynamics of an optomechanical cavity considering two modes of the electromagnetic field and a mechanical resonator. As a result of this interaction, the initial non-entangled state evolves into a final entangled state. In this work, we use the \(Q(\alpha )\) function to observe the behavior of the system in the phase space, finding that such entanglement is a function of time showing

Diabetes mellitus, at the forefront of the diseases of our age, is a type of disease that plays a leading role in the formation of many deadly diseases and is very common all over the world. In this work, based on the system in Shabestari et al. (Chaos Solitons Fractals 112:44–51, 2018), we give the fractional glucose–insulin regulatory system for the first time by Caputo–Fabrizio derivative. We present

In the current study, rational, interaction and combined multi-wave solutions are obtained for Heisenberg ferromagnetic spin chain equation by using the logarithmic transformation and symbolic computation with ansatz functions. By the choice of suitable parameter values, the dynamics of these obtained solutions are analyzed and represented in figures. The dynamics and characteristics of lump–kink,

We discuss the Cottingham formula and evaluate the proton–neutron electromagnetic mass difference exploiting the state-of-the-art phenomenological input. We decompose individual contributions to the mass splitting into Born, inelastic and subtraction terms. We evaluate the subtraction-function contribution connecting the input based on experimental data with the operator product expansion matched to

Masses and the magnetic moments of baryon decuplet are evaluated in the symmetric nuclear and hyperonic matter at finite temperature using a chiral SU(3) quark mean field model approach. The decuplet baryon masses considerably decrease with the rise in the baryonic density of the medium. With the increase in strangeness (more number of hyperons as compared to nucleons) fraction, the non-strange baryons

The present study is related to the design of a new mathematical model based on the Lane–Emden pantograph delay differential equation. The new model is obtained by using the sense of delay differential equation and standard Lane–Emden second-order equation. For the numerical solutions of the designed model, a well-known Bernoulli collocation method is implemented. In order to check the perfection and

In this paper, the (2 + 1)-dimensional coupled higher-order nonlinear Schrödinger equations are under investigation. The mixed-type vector solitons are derived via Hirota method. The interactions are analyzed graphically mainly on x–t and x–y planes. Moreover, a high intensity pulse, combined solitary waves and bound state solitons are discovered during the interactions. These results are available

Molten salt reactors (MSRs) have gained worldwide interest in recent years due to their appealing safety and resource utilisation characteristics. These reactors have a unique feature, i.e. the presence of nuclear fuel in the form of a molten fluoride or chloride salt containing the fissile and fertile materials. The fuel salt also acts as the coolant, and this dual role results in a complex, highly

We assume the negative cosmological constant as a thermodynamic pressure and the anti-de Sitter (AdS) black hole thermodynamics with modified Chaplygin gas. We write the mass, volume, entropy and temperature of the black hole due to the thermodynamic system. We find a new solution of the Einstein’s field equations of AdS black hole with modified Chaplygin gas as a thermodynamic system. We examine the

The electromagnetic field coupled to a \((2l-1)\) order of nonlinear medium leads to the model of a 2lth anharmonic oscillator, \(l\ge 2\) being an integer. The oscillator with \(l=2\) corresponds to the model of a quartic anharmonic oscillator. In spite of the huge advancement of mathematical physics, we are still in search of exact analytical solution to the lowest order (i.e., \(l=2)\) of anharmonic

Core–shell MnFe2O4/α-Fe2O3 nanoparticles having core diameters from 5 nm to 28 nm are synthesized by chemical co-precipitation route and investigated structurally and magnetically. The existence of the cubic spinel phase of MnFe2O4 (FiM) core together with the rhombohedral phase of α-Fe2O3 (AFM) shell was confirmed by X-ray diffraction. The field-cooled hysteresis loop at 5 K reveals a strong exchange