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Authors:Sravan Nayek Gaikwad, Dnyaneshwar Madhavrao Surwase Pages: 1 - 11 Abstract: Canadian Journal of Physics, Ahead of Print. In this study, the onset of convection in a rotating horizontal porous layer saturated by a binary nanofluid was theoretically investigated under the influence of thermodiffusion and nanoparticles. To study the onset of convection, the Darcy–Brinkman model was employed for the porous medium, and the thermal Rayleigh number was derived analytically using linear stability analysis. Water–ammonia-based silver, copper, and alumina, three binary nanofluids, were considered, and the effect of nanoparticles on the stability of the system was analysed using addition factor analysis. The Brinkman model for viscosity and Bruggeman model under the mean field approach for thermal conductivity were used to study the impact of nanoparticles. Heat transport was examined by calculating the heat transfer coefficient. The effects of nondimensional parameters involved in binary nanofluids on the onset of convective instabilities are depicted pictorially. The dependence of the size of the convection cells on nondimensional parameters is also discussed. The Darcy–Taylor number decreases the size of convection cells, whereas the Darcy number increases the size of convection cells. The size of the convection cells is independent of the porosity of the medium, Lewis number, volume fraction of nanoparticles, Soret effect of nanoparticles, and the solute in binary nanofluids. Furthermore, the Darcy–Taylor number and porosity have stabilising effects, whereas the Darcy number, volume fraction of nanoparticles, and Lewis number have destabilising effects on the system. Soret effects of nanoparticles and solutes exhibit dual consequences on stability. They stabilise the binary nanofluid layer if δ4 < –1 and destabilise when δ4 > –1. Their effect is immaterial if δ4 = –1. Citation: Canadian Journal of Physics PubDate: 2022-03-11T03:51:01Z DOI: 10.1139/cjp-2021-0247

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Authors:M. Khademi, S. Nasiri Pages: 1 - 11 Abstract: Canadian Journal of Physics, Ahead of Print. In this work, to investigate the dynamical nature of the kinematic asymmetry in the isolated gas-rich dwarf irregular galaxy W LM in the Local Group, we consider that the dark matter halo and the disk do not have the same center of mass (i.e., the disk lies off-center in the potential of the extended dark matter halo), which is one of the possible physical explanations for the kinematic lopsidedness. To do so, we generate a lopsided halo potential by considering two dark matter mass density models, ISO and Burkert, and we add up the contribution to the rotation curve of a perturbation term [math] in the gravitational potential, which arises from the offset between the disk and the dark matter halo. We show that such an m = 1 perturbation improves the rotation curve modeling when compared to a non-perturbed potential and the shape of the HI gas rotation curves is fitted better in the approaching side if the perturbation term in the halo potential is taken into account for this galaxy dynamics. In fact, displacing the disk center by 0.1 kpc from the halo center is sufficient to provide such an improvement in modeling the rotation curve. Citation: Canadian Journal of Physics PubDate: 2022-02-24T12:42:52Z DOI: 10.1139/cjp-2021-0332

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Authors:Pengfei Cao Pages: 1 - 6 Abstract: Canadian Journal of Physics, Ahead of Print. Based on the extended Huygens–Fresnel principle and Wigner distribution function (WDF), the influence of anisotropic ocean turbulence on effective radius of curvature (ERC) for partially coherent Hermite–Gaussian (PCHG) beams is studied in detail. Our numerical results show that the beam orders and the anisotropic ocean turbulence factors have a certain influence on ERC of PCHG beams propagating in anisotropic ocean turbulence. Besides, ocean turbulence parameters and beam initial parameters would exert different influence on ERC of PCHG beams propagating in anisotropic ocean turbulence. In addition, Rayleigh range of PCHG beams propagating in anisotropic ocean turbulence decreases with increasing anisotropic ocean turbulence factors. These findings may be used for anisotropic ocean optical communications of PCHG beams. Citation: Canadian Journal of Physics PubDate: 2022-02-10T08:00:00Z DOI: 10.1139/cjp-2019-0066

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Authors:Zachary Podrebersek, Florian Baer, Eundeok Mun Pages: 1 - 5 Abstract: Canadian Journal of Physics, Ahead of Print. High quality single crystals of LaCu2Si2 are successfully grown from a high temperature ternary melt. The physical properties are investigated by measurements of specific heat, electrical resistivity, thermoelectric power, and magnetization. The electrical resistivity follows an ordinary metallic behavior with a residual resistivity ρ0 = 0.87 μΩ cm and residual resistivity ratio (RRR) ρ(300 K)/ρ0 ∼ 13. Quantum oscillations for H ab are clearly observed from electrical resistivity, magnetization, and thermoelectric power measurements in magnetic fields as low as 30 kOe and at temperatures as high as 20 K. In the earlier studies no quantum oscillations have been observed from both single crystal and polycrystalline samples. The small value of ρ0 and quantum oscillations indicate a high quality of LaCu2Si2 samples used in the present study. The cyclotron effective mass obtained from the analysis of the de Haas – van Alphen (dHvA) oscillations is small m0 ∼ 0.14me, which is consistent with the small electronic specific heat coefficient γ ∼ 3.4 mJ/mol K2. The detected dHvA frequencies of LaCu2Si2 are compared with those of the RCu2Si2 (R = Y, Th, and Ce) family. Citation: Canadian Journal of Physics PubDate: 2022-02-07T08:00:00Z DOI: 10.1139/cjp-2021-0287

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Authors:L.A. Bakaleinikov, A. Gordon Pages: 1 - 7 Abstract: Canadian Journal of Physics, Ahead of Print. The analysis of magnetization oscillations (de Haas – van Alphen effect; dHvA effect) and features of the Fermi surface shape in three (3D)- and two-dimensional (2D) metals shows that the dynamic phenomena — the dynamics of domain walls and interphase boundaries during diamagnetic phase transitions — are described by a new nonlinear partial differential equation. The equation is a result of the inclusion of the case of multiple extremal cross sections of the Fermi surface in these metals. Our consideration indicates the possibility of the appearance of metastable non-spin domains (Condon domains) and first-order phase transitions to the ordered phase in the regime of dHvA oscillations for the two-frequency case. Sine–Gordon, Klein–Gordon, double sine–Gordon, time-dependent Ginzburg–Landau equations, and the telegraph equation are limiting cases of the derived equation. We show that particular moving kink-soliton solutions of the equation describe traveling wave fronts being moving domain walls and interphase boundaries in the Condon domain phase. Citation: Canadian Journal of Physics PubDate: 2022-02-07T08:00:00Z DOI: 10.1139/cjp-2021-0338

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Authors:M.S. Swapna, S. Sankararaman Pages: 1 - 7 Abstract: Canadian Journal of Physics, Ahead of Print. This paper reports continuous wave (CW) laser-assisted synthesis of plasmonic aluminium nanoparticles (ANPs) by drastically reducing the laser power density from the existing 105 W/cm2 to 9 W/cm2 using a specially designed ultralow duty cycle chopper. The aluminium target is subjected to laser irradiation by keeping it in a liquid medium maintained at a specific temperature. The effect of chopping frequencies (F), temperatures (T), and surfactant-glucose (C) on the formation of ANPs are investigated through field emission scanning electron microscopic and UV-visible spectroscopic analyses. The energy required for the ejection of ANPs from the target is obtained from the optical source, thermal source, and the molecular collision due to convection current. The purity of the nanoparticle is determined from energy dispersive spectroscopic analysis. The analysis reveals that ANPs of sizes in the range 20–50 nm are formed when F = 30 Hz, T = 60 °C, and C = 18 mg/cc, exhibiting excellent ageing stability. The photoluminescence spectrum, power spectrum, and CIE analyses for the excitations at 350 nm and 390 nm indicate the emission to be blue, suggesting that it is a suitable fluorescence material for UV-plasmonics. Citation: Canadian Journal of Physics PubDate: 2022-02-02T03:48:01Z DOI: 10.1139/cjp-2021-0042

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Authors:Timothy Ganesan Pages: 1 - 5 Abstract: Canadian Journal of Physics, Ahead of Print. Statistical analysis of the behaviour of interacting particles suspended in a fluid undergoing Brownian motion is extended by a deeper investigation into its spectral properties. By utilizing random matrix theory, spectral statistics is then integrated into the Einstein–Brownian motion formulation for interacting particles suspended in a fluid. The modified version of the conventional Brownian formulation along with the resulting insights are presented in this work. The second part of this work provides the implementation of spectral statistics to a system of interacting massive particles of a gravitating dust solution. Formulating the system on a Riemannian manifold with a random metric tensor, a deterministic dust solution density is achieved, where spectral and statistical aspects of the relativistic theory of gravity are uncovered. Potential application in modeling properties of galaxy formation and evolution is discussed. Citation: Canadian Journal of Physics PubDate: 2022-01-28T08:00:00Z DOI: 10.1139/cjp-2021-0237

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Authors:Biswaranjan Dikshit Pages: 1 - 8 Abstract: Canadian Journal of Physics, Ahead of Print. Inflation has presented solutions for a number of important cosmological problems while leaving some unanswered. In this paper, we present a new cosmological model based on the quantization of the zero-point field, which is consistent with empirical data, requires fewer assumptions, and presents answers to some of those unanswered questions. A comparison between standard cosmology and the theory presented in this paper is given herein. Vacuum energy density: The standard inflationary model needs both Hubble’s constant and matter density to estimate the vacuum energy density, but new cosmological model needs only Hubble’s constant. Non-vacuum energy density: The standard model cannot predict the non-vacuum energy density, but the new model can predict it using only Hubble’s constant. Ratio of vacuum energy to total energy: The standard model cannot predict the ratio of vacuum energy to total energy, but the new model can predict it, without using Hubble’s constant. Energy conservation: In the standard model, total energy is not conserved before inflation and at the time of the creation of the universe, but in the new model total energy is mathematically proved to be conserved from the beginning of the universe as net energy (including gravitational potential energy) is always zero. Flatness and homogeneity: The standard model requires an inflaton field with a specific potential energy distribution to explain it, but the new model does not need any such hypothetical field; the zero-point field is sufficient. Citation: Canadian Journal of Physics PubDate: 2022-01-27T08:00:00Z DOI: 10.1139/cjp-2021-0278

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Authors:Carlos Leonardo Di Prinzio, Pastor Ignacio Achával Pages: 1 - 6 Abstract: Canadian Journal of Physics, Ahead of Print. In this work, the migration of a three-dimensional (3D) spherical crystal in the presence of mobile particles using a Monte Carlo algorithm was studied. Different concentrations of particles (f) and different particle mobilities (Mp) were used. It was found that the grain size reaches a critical radius (Rc), which depends exclusively on f. This dependence can be written as Rc ∝ f1/3. The dynamic equation of grain size evolution and its analytical solution were also found. The proposed analytical solution successfully fits the simulation results. The particle fraction in the grain boundary was also found analytically and it fits the computational data. Citation: Canadian Journal of Physics PubDate: 2022-01-05T08:00:00Z DOI: 10.1139/cjp-2020-0599

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Authors:Marina Dorocki, Branka Radulović, Maja Stojanović, Olivera Gajić Pages: 1 - 7 Abstract: Canadian Journal of Physics, Ahead of Print. Most researchers are interested in investigating the impact of a blended learning approach (BLA) on students’ performance, yet this approach’s instructional efficiency has not yet been quantified. Therefore, this research aims to determine the impact of teacher-created online Moodle-based materials in combination with face-to-face learning on student achievement and mental effort, that is, to determine the instructional efficiency of applied teaching approaches at physics classes in high school. For this research, we chose to teach students physical principles of direct current, which involves abstract concepts. Using BLA, students can prepare better for a real experiments in the lab, and this approach also creates a safe environment for students while allowing them to demonstrate the learned physical phenomena. The Moodle platform course is developed for this purpose and implemented in a BLA environment. Students are gradually guided from easier to more difficult concepts in this research, considering the working memory’s capacity and the teaching material requirements. Our results show that the students who used BLA achieved higher scores on the knowledge test, and they also used less mental effort than students that used a conventional teaching approach. We also show that instructional efficiency for BLA is positive and significantly higher than the instructional efficiency of the conventional approach. This research’s results are primarily designed for physics teachers to better understand the effects of the BLA and apply teaching approaches that respect the principles of children’s cognitive development. Citation: Canadian Journal of Physics PubDate: 2021-12-20T08:00:00Z DOI: 10.1139/cjp-2019-0602

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Authors:Z. Yousaf, M.Z. Bhatti, M.M.M. Nasir Pages: 1 - 8 Abstract: Canadian Journal of Physics, Ahead of Print. The concept of complexity for dynamical spherically symmetric dissipative self-gravitating configuration (Herrera et al. Phys. Rev. D, 98, 104059 (2018). doi:10.1103/PhysRevD.98.104059) is generalized in the scenario of modified Gauss–Bonnet gravity. For this purpose, a spherically symmetric fluid with locally anisotropic, dissipative, and non-dissipative configurations is considered. We choose the same complexity factor for the structure as we did for the static case, while we consider the homologous condition for the simplest pattern of evolution. In this approach, we formulate structure scalars that demonstrate the essential properties of the system. A fluid distribution that fulfills the vanishing complexity constraint and proceeds homologously corresponds to isotropic, geodesic, homogeneous, and shear-free fluid. In the dissipative case, the fluid is still geodesic but it is shearing, and there is a wide range of solutions. In the last, the stability of vanishing complexity is examined. Citation: Canadian Journal of Physics PubDate: 2021-12-17T08:00:00Z DOI: 10.1139/cjp-2021-0328

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Authors:Ugur Saglam, Deniz Deger Pages: 1 - 5 Abstract: Canadian Journal of Physics, Ahead of Print. We aim to derive a phenomenological approach to link the theories of anomalous transport governed by fractional calculus and stochastic theory with the conductivity behavior governed by the semi-empirical conductivity formalism involving Debye, Cole–Cole, Cole–Davidson, and Havriliak–Negami type conductivity equations. We want to determine the anomalous transport processes in the amorphous semiconductors and insulators by developing a theoretical approach over some mathematical instruments and methods. In this paper, we obtain an analytical expression for the average behavior of conductivity in complex or disordered media via the fractional-stochastic differential equation, the Fourier–Laplace transform, some natural boundary initial conditions, and familiar physical relations. We start with the stochastic equation of motion called the Langevin equation, develop its equivalent master equation called the Klein–Kramers or Fokker–Planck equation, and consider the time-fractional generalization of the master equation. Once we derive the fractional master equation, we then determine the expressions for the mean value of the variables or observables through some calculations and conditions. Finally, we use these expressions in the current density relation to obtain the average conductivity behavior. Citation: Canadian Journal of Physics PubDate: 2021-12-17T08:00:00Z DOI: 10.1139/cjp-2021-0315

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Authors:A. Zeeshan, F. Bashir, F. Alzahrani Pages: 1 - 10 Abstract: Canadian Journal of Physics, Ahead of Print. Electrokinetic microperistaltic pumps are important biomechanical devices that help target drug delivery to specific body parts. The current study focuses on the mathematical modelling and analysis of some important aspects of such flows in a channel with complex waves. It is considered that solid particles are uniformly distributed in the flow, and that these particles are non-conducting. Parameters such as the particle volume fraction coefficient, electro-osmotic parameter, and Helmholtz–Smoluchowski parameter are specifically focused on in this study. Equally sized spherical particles were uniformly floated in a non-Newtonian Powell–Eyring base fluid. The defined flow problem was modelled and analyzed analytically for the transport of a solid–liquid suspension. It is accepted that the flow is steady, non-turbulent, and propagating waves have a considerably longer wavelength compared to the amplitude. The conditions and assumptions lead to a model of the coupled partial differential equations of order two. The exact results of the homotopy perturbation method expansion method are obtained and shown accordingly. Predictions of the behavior of important parameters are displayed in the figures. The impact of several parameters was analyzed. The current study involved transporting or targeted drug delivery systems using peristaltic micropumps and magnetic fields in the pharmacological engineering of biofluids, such as blood. Citation: Canadian Journal of Physics PubDate: 2021-12-17T08:00:00Z DOI: 10.1139/cjp-2021-0199

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Authors:Wayne M. Saslow Pages: 1 - 6 Abstract: Canadian Journal of Physics, Ahead of Print. We employ Onsager’s irreversible thermodynamics to study the inverse Edelstein effect (IEE) for a non-magnetic material (NM) adjacent to a topological insulator (TI) with a strong spin–orbit interaction. The TI surface state region is treated as quasi two-dimensional (2D). For the IEE, the source is a 3D spin flux incident from the NM that converts, at the NM–TI interface, to a quasi-2D charge current in the TI. For the Edelstein effect (EE), the source is a quasi-2D charge flux incident from the TI that converts, at the interface, to a three-dimensional (3D) spin flux in the NM. For strong spin–orbit coupling, as considered here, when the 3D spin flux crosses to the 2D TI, the quasi-2D charge current is produced along with a quasi-2D spin accumulation. (For weak spin–orbit coupling, production of charge current and of spin accumulation are distinct processes.) We compute the associated rates of heating. Citation: Canadian Journal of Physics PubDate: 2021-12-14T08:00:00Z DOI: 10.1139/cjp-2021-0107

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Authors:J. Grisales-Casadiegos, C. Sarmiento-Cano, L.A. Núñez Pages: 1 - 6 Abstract: Canadian Journal of Physics, Ahead of Print. We present a methodology to simulate the impact of the atmospheric models in the background particle flux on ground detectors using the Global Data Assimilation System. The methodology was within the ARTI simulation framework developed by the Latin American Giant Observatory Collaboration. The ground-level secondary flux simulations were performed in a tropical climate in the city of Bucaramanga, Colombia. To validate our methodology, we built monthly profiles over Malargüe between 2006 and 2011, comparing the maximum atmospheric depth, Xmax, with those calculated with the Auger atmospheric option in CORSIKA. The results show significant differences between the predefined CORSIKA atmospheres and their corresponding Global Data Assimilation System atmospheric profiles. Citation: Canadian Journal of Physics PubDate: 2021-11-29T08:00:00Z DOI: 10.1139/cjp-2020-0561

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Authors:F.T. Brandt, J. Frenkel, S. Martins-Filho, D.G.C. McKeon, G.S.S. Sakoda Pages: 1 - 6 Abstract: Canadian Journal of Physics, Ahead of Print. We study the Yang–Mills theory and quantum gravity at finite temperature, in the presence of Lagrange multiplier fields. These restrict the path integrals to field configurations, which obey the classical equations of motion. This has the effect of doubling the usual one-loop thermal contributions and of suppressing all radiative corrections at higher-loop order. Such theories are renormalizable at all temperatures. Some consequences of this result in quantum gravity are briefly examined. Citation: Canadian Journal of Physics PubDate: 2021-11-16T08:00:00Z DOI: 10.1139/cjp-2021-0248