Baku State University

Uniqueness and Fourier Spectral Recovery of a Time-Varying Coefficient in the Two-Dimensional Sixth-Order Boussinesq Equation with Integral Data

This work studies an inverse boundary value problem for the two-dimensional sixth-order Boussinesq equation. The source term contains an unknown time-dependent coefficient, and an integral observation of the solution supplies the extra condition. The aim is to recover the solutio...

Silicon photomultipliers for enhanced lidar bathymetric applications

Background Silicon photomultipliers (SiPMs) are emerging as promising photodetectors for bathymetric Light Detection and Ranging (LIDAR) because of their high photon detection efficiency (PDE), single-photon sensitivity, and low operating voltage. However, the limited fill factor...

Decomposition Kinetics and Thermal Stabilization via Interfacial Restrictions in PS/TiO2 Nanocomposites

Abstract This study investigates the structural morphology, chemical integrity, and non-isothermal decomposition kinetics of polystyrene (PS) nanocomposites incorporated with titanium dioxide (TiO2) nanoparticles (3, 5, and 10 wt %). Scanning electron microscopy (SEM) confirmed h...

The Effect of Single-Atom (Zn, Cd, or Hg) Replacement on the Strength and Directionality of the Spodium Bond

Abstract The spodium bond (SpB) is an attractive noncovalent interaction between the Group 12 element (Zn, Cd, or Hg) and a nucleophile (Nu). In comparison to the monovariant H-bond at R–H···Nu synthon, the SpB parameters (strength and directionality) can also be regulated by rep...

Exact solution to the linear Ginzburg–Landau equation for a single-band type-II superconductor confined in a thin-film structure

Abstract We solve exactly the linear Ginzburg–Landau equation for a single-band bulk superconductor confined to a thin-film structure. In order to achieve a confinement effect, we replace the constant mass with an effective mass varying with position. We break the isotropic behav...

Uniqueness and CB-Spline Approach for Identifying the Time-Varying Coefficient of a Second-Order Hyperbolic PDE with Non-Classical Boundary Condition

This work is concerned with an inverse problem for the second-order hyperbolic PDE, in which extra data are imposed. The time-varying coefficient is not known a priori. We begin by introducing the notion of a classical solution for the problem at hand. The primary aim is to recov...

Efficient DR-23 adsorption by ZIF-67-acetate and sulfate in single and mixed dye matrices

Abstract Toxicants such as Direct Red-23 (DR-23) require advanced wastewater treatment techniques to mitigate environmental pollution. Herein, two variants of ZIF-67 (acetate and sulfate) were fabricated and investigated for the advanced adsorption of DR-23. Using different count...

Comparative study of different europium doping techniques on the structural and optical properties of ZnO nanoparticles

Abstract Zinc oxide nanoparticles (ZnO NPs) were synthesized via a co-precipitation method and doped with Eu 3+ ions using three different approaches: in-situ doping during synthesis (Eu:ZnO(P)), post-synthesis doping (Eu:ZnO(S)), and modification of commercially available ZnO (E...

A winding number analysis of Schwarzschild black hole stability in light of Planck-scale modified kinematics

Abstract Determining whether Planck-scale effects can stabilize black holes addresses fundamental questions about black hole evaporation and quantum gravity consistency. Here, we analyze the thermodynamic topology ofSchwarzschild black holes under Planck-scale modified kinematics...

FTIR–XRD comparative study of pyrolysis residues obtained from plastic waste

This study examines the thermal degradation of PET-1 plastic waste containers (SIRAB, Azerbaijan) using FTIR spectroscopy and XRD analysis. Samples were pyrolyzed at 350°C, 450°C, and 550°C for 1 h under inert conditions. XRD results show a progressive loss of crystallinity with...