Efficient heat transfer and minimization of entropy in micropolar nanofluids are essential for applications such as lubrication systems and energy storage devices. Dispersion of nanoparticles helps improve fluid properties like viscosity and thermal conductivity, which enhances system performance. In contrast, aggregation of nanoparticles can reduce these benefits and negatively affect performance. This study investigates the entropy optimization and heat transfer characteristics of an unsteady, laminar thin-film flow of an electromagnetic micropolar nanofluid. The fluid dynamics are modeled using the Maxwell–Bruggeman and Krieger–Dougherty effective medium theories to capture both nanoparticle aggregation and nonaggregation effects. The Krieger–Dougherty model describes the variation in viscosity due to nanoparticle concentration and clustering, while the Maxwell–Bruggeman model characterizes the thermal conductivity as influenced by nanoparticle distribution. Through the application of similarity transformations, the governing partial differential equations are reduced to a set of nonlinear ordinary differential equations, which are then solved numerically using the Chebyshev collocation method. The results indicate that an increase in spin gradient viscosity and electric field leads to a rise in the velocity profile. Moreover, the fluid temperature decreases as the Eringen parameter increases. For nanoparticles without aggregation, the friction coefficient decreases slightly by approximately 0.35%, whereas the Nusselt number increases by about 3.13%.

In this paper, we present a semi-analytical method employing the Green’s function technique to compute the phonon transmission coefficient in a two-dimensional square mass-spring network under the harmonic approximation. The structure includes a small region in the center where second-neighbor springs are introduced. We perform a unitary transformation on the system’s dynamic matrix to separate the phonon modes in the structure’s vertical direction. This approach simplifies the semi-infinite sections (phonon leads) into basic mass-spring chains with generalized dispersion relations. Consequently, the inverse of the Green’s function matrix of the transformed central part is constructed and numerically inverted. Our numerical analysis of phonon transport in a long, narrow square nanoribbon reveals that the inclusion of stronger vertical springs in a small region significantly suppresses the phonon transmission coefficient and opens a frequency gap in the center of the low-frequency band. Interestingly, in contrast to the resonant regime, the presence of diagonal springs in the perturbed region enhances tunneling phonon conductance.

In the quest for groundbreaking materials with multifaceted applications, the enigmatic world of BJO3 ([Formula: see text] and Mn) crystals beckons, promising a tapestry of structural, electronic, optical, and energy loss marvels. Our journey through these captivating compounds has revealed a realm where the known boundaries of materials science blur and the uncharted territories of innovation stretch endlessly. Our exploration commences with the crystalline beauty of BJO3 ([Formula: see text] and Mn). Delicate, yet robust, their cubic structures defy convention, unveiling the potential for stability and versatility that transcends the ordinary. Venturing into the electronic realm, we unlock the mysteries of metallic allure hidden within these crystals. By harnessing the precision of the TB-mBJ potential, we shatter the limitations of traditional calculations, shedding light on electronic states and band structures that defy expectations. The optical saga unfolds, where dielectric functions, refractive indices, absorption coefficients, and reflectivity dazzle with their chameleon-like responses to varying energy levels. These crystals reveal a dynamic versatility that holds promise for transformative advances in photonics and optoelectronics. Our journey delves deeper into the Energy Loss Function (ELF), where the narratives of energy dissipation come alive. From near-zero energy loss in BCrO3 to the dramatic energy loss odyssey of BMnO3, the unique electron energy interactions within these crystals offer a glimpse into uncharted territories of technological potential. As we navigate this captivating odyssey, BJO3 ([Formula: see text] and Mn) crystals emerge as beacons of innovation, beckoning scientists and visionaries to explore their limitless possibilities. Beyond their structural stability and metallic essence, these crystals unlock doors to optical versatility and intriguing energy dynamics, igniting the fires of curiosity and innovation. In the ever-evolving saga of materials discovery, BJO3 ([Formula: see text] and Mn) crystals are not just chapters but whole volumes, waiting to be written. As we conclude this abstract, we stand at the threshold of discovery, humbled by the mysteries that continue to beckon us to explore, question, and innovate on the relentless quest for the next material marvel.

This study presents a comprehensive investigation of the hemodynamic and heat transfer behavior of different geometrical-shaped overlapped stenosed arteries in the presence of electro-osmotic velocity using computational fluid dynamics (CFD) simulations. Additionally, the application of boundary stress at one wall of the artery is considered, adding an important aspect to the analysis. By incorporating electro-osmotic velocity, which accounts for fluid movement induced by an applied electric field, this study explores the interplay between electro-kinetic phenomena and arterial flow dynamics. A multidisciplinary approach is adopted, combining CFD simulations with experimental validation, to assess flow characteristics, wall shear stress distribution and pressure gradients in these intricate arterial configurations. This study provides a valuable comparative analysis of boundary stress and electro-osmotic velocity, revealing their effects on arterial hemodynamics and heat transfer in the presence of overlapping stenoses. The findings of this study provide valuable insights into the hemodynamic consequences of overlapped stenosed arteries and the impact of electro-osmotic velocity, along with the application of boundary stress, on flow behavior. The outcomes of this research provide a foundation for advancing clinical decision-making and intervention strategies, facilitating personalized treatment approaches for patients with complex arterial pathologies.

The remarkable arrangement of high-entropy alloys, such as CoCuFeNi, creates an interesting research domain, driven by their superior mechanical and physical characteristics. Thus, this work addresses temperature-dependent elastic, mechanical and anisotropic characteristics of the CoCuFeNi alloy, derived from molecular dynamics (MD) calculations. The elastic stiffness constants, as well as the bulk, shear and Young’s moduli, Poisson’s ratio, and additional mechanical properties, such as hardness and ductility, were also reported through a combination of theoretical analysis and MD simulations between 0[Formula: see text]and 1000 K. The usual cubic elastic stiffness constants, with bulk, shear and Young’s moduli, as well as the hardness of the alloy, were observed to decrease with rising temperature and confirm the Born mechanical stability conditions. However, a clear increase in the alloy’s B/G ratio is observed at elevated temperatures, indicating its persistent ductile character. The findings suggest that the Poisson’s ratio of the CoCuFeNi alloy remains stable, while significant elastic anisotropy evolves in a complex manner with increasing temperature.

This study examines the three-dimensional, steady-state Magnetohydrodynamic (MHD) flow of a Sisko nanofluid past a stretching sheet, incorporating the effects of thermophoresis, Brownian motion and mixed convection under convective boundary conditions. Results indicate that increasing the magnetic parameter enhances the temperature profile while reducing velocity, with higher relaxation and retardation times further elevating temperature, whereas the concentration relaxation time has the opposite effect. The concentration field decreases with increasing Lewis number and Brownian motion parameter, while heat transfer improves significantly with stronger thermophoresis and magnetic effects. RSM is employed to analyze parameter interactions, revealing that permeability strongly influences mass transfer, while the magnetic parameter plays a dominant role in heat transfer, achieving an [Formula: see text] value exceeding 99%, demonstrating excellent predictive accuracy.

Using the combined effects of heat convection and magnetohydrodynamics (MHD), this study provides a comprehensive analytical analysis of the peristaltic movement of Sisko nanofluid in a vertical endoscopic channel. The integration of convective boundary conditions, MHD forces, nanoparticle-enhanced heat conductivity and non-Newtonian Sisko fluid behavior inside a realistic biological geometry is the novelty of this study. Since the governing equations are nonlinear, the velocity and pressure gradient profiles are solved using the Homotopy Perturbation Method (HPM) and the temperature and concentration fields are precisely solved using the Laplace transform technique. According to quantitative results, axial velocity decreases first as a result of the amplitude ratio’s diminishing effects. On the other hand, buoyant forces, which are indicated by the Grashof number, increase velocity by as much as 19%. Widening the channel allows fluid to travel more easily since the pressure gradient drops by up to 35%. Furthermore, it is discovered that higher values of [Formula: see text] and [Formula: see text], respectively, result in a significant increase in temperature and nanoparticle concentration. Trapping phenomena are highlighted by streamline analysis using five different waveforms, which demonstrates that larger wave amplitudes cause larger trapped boluses to occur, especially close to the centerline. With implications for endoscopy-based fluid transfer, magnetically assisted medication delivery and the treatment of hyperthermia, this work offers new insights into regulated transport mechanisms in biological systems and medical devices.

In this paper, a new representation of the scalar electrodynamics is discovered which gives a more redundant description of electromagnetic theory and suitable to construct an appropriate matter action which contains two global symmetries. The symmetries of the model when localized by gauge principle provide a covariant fracton gauge theory. The method followed here produces all the results such as zero mobility and gravitational effect in a covariant manner. The success of our algorithm dispels the erroneous idea that the boost violation is necessary in order to get fracton gauge theory.

A series of novel red-emitting Eu[Formula: see text] doped Sr2MgWO6 phosphors were prepared via the conventional solid-state reaction (SSR) method. Sr2MgWO6:Eu[Formula: see text] phosphors crystallize in a cubic structure having space group [Formula: see text] The double perovskite compound Sr2MgWO6 has found potential applications in ceramics, solar cells, ferroelectricity superconductors and optical materials. This material has attracted attention due to the physical properties it possesses, viz., structural stability and constancy against atmospheric conditions. Very limited work has been done so far to study the optical properties of Sr2MgWO6. We reported a strong red emission of Eu[Formula: see text] ion at 618[Formula: see text]nm (5D[Formula: see text]F2) for the excitation of 464[Formula: see text]nm (7F[Formula: see text]D2). Concentration quenching is observed when Eu[Formula: see text] is doped above 1.5% in Sr2MgWO6. The phase and color purity have maintained even with an increase in the concentration of dopant. The lifetime measurement and color temperature of Eu[Formula: see text]-doped Sr2MgWO6 phosphor has a promising future in warm LED applications. We claim this is the first report of Sr2MgWO6:Eu[Formula: see text] in photoluminescence.