In research, solar collectors and photovoltaic systems (PV/T) are considered, which one of the most promising renewable energy sources.Electricity, is produced by panels, has great potential, but there may be technological shortcomings, do not give maximum efficiency.The main goal our research to develop a universal model heat exchange processes for optimizing design features PV/T at stages variability, allows us increase term service such their expanded you change more practical parameters...

Based on calculations conducted a microscopic level, the phonon heat capacity of ultrathin graphene nanofilms such as bigraphene and trigraphene, single-wall nanotubes, is quantitatively described. The nature flexural stiffness monolayers analyzed, temperature intervals at which shape dependence determined by contributions made vibrations are identified. contribution to derived from nanotube waves that propagate along surface thereof bending tube whole one-dimensional object, torsional vibrations.

The model of maneuvering unit based on generating and accumulating capacities, which are elements an autonomous mobile settlement, is proposed. generating, capacities analyzed. Two types neural networks for integrated power system forecasting analysis best option selected. variants accumulator units placement according to the theory reliability electric systems role this agile unit, its fate functions in established

Phonon and electron spectra of metallic bigraphene are analyzed in the presence step-edge crystal imperfection. Different geometries considered. The dynamic planar stability considered structure is proved for temperatures above ambient. number phonon states shown to grow near K-point first Brillouin zone, compared pristine graphene. It found, that this type defects causes substantially nonuniform distribution pronounced increase with energies close Fermi energy can be expected spectrum...

An analysis of the work a photovoltaic station on basis hybrid module based solar cells modules is carried out. The identified drawbacks suggest power take-off scheme boost converter (step-up converter). principle electric circuit an adjustable bridge resonant enhancer with digital control developed, which ensures reliability work, quickly and accurate maximum point finding conversion efficiency up to 0.956. implementation testing as part photoelectric was

Telemedical system for monitoring the psycho-neurological state rehabilitation is evolving assessment and supervision of various neurological syndromes. Persons with disabilities are not a homogenous group, they facing multiple problems in their daily life. Common problem people old aged that have lacked access to basic services. Nowadays researchers focused on human computer interaction-based technologies bring social-emotional intelligence closer. The paper designed achieve cognitive using...

The atomic dynamics of linear chains embedded in a crystalline matrix or adsorbed on its surface is studied. A chain formed by substitutional impurities layer and at the same time offsetting from this was analyzed particularly. This system models actively studied experimentally structures which gas molecules are walls bundles carbon nanotubes located certain medium. It shown that quasi-one-dimensional features typical for interatomic interaction higher than between atoms crystal matrix. On...

We perform analytical and numerical analysis of the electronic phonon spectrum evolution graphene during formation a boundary with “zigzag” chirality. It is determined, that excited gap wave has relativistic dispersion near Fermi level propagates along decays distance from it. Both properties considered. shown propagation occurs only atoms sub-lattice, which contains bonds broken formation. The forms narrow resonance peaks in local density states sublattice atoms. shown, on layer this...

The paper deals with the accuracy of proposed imitational model solar power plant (SPP) in its operating conditions at modeling well-known software packages. necessity solving this question is dictated by fact that inaccuracy simulation programs allows one to argue improvement cannot be performed correctly due calculation errors program itself. results electric generation SPP Matlab package are presented. It was found out, which packages meets set requirements more exactly (by error...

Calculations on a microscopic level are used to explain the experimentally observed negative linear thermal expansion along some directions in number of crystalline compounds with complicated lattices and anisotropic interactions between atoms. Anomalies temperature dependence coefficient analyzed layered crystals made up monatomic layers (graphite graphene nanofilms) multilayer “sandwiches” (transition metal dichalcogenides), multilayered crystal structures such as high-temperature...

Many years of experience in the construction and operation 6 - 35 kV overhead power lines with bare wires showed insufficient reliability such their increased danger. One main causes accidents violations are thunderous overcharging on lines, causing impulse overlap destruction insulators leading to arc closures, collateral damage equipment, line outages. Emergency outages -35 due lightning overvoltages account for up 40% total number trips. Due low strength, insulation distribution networks...

The densities of phonon states and their related vibrational thermodynamic characteristics, such as heat capacity, root-mean-square displacement atoms, thermal expansion, are calculated analyzed at the microscopic level for graphite graphene nanoformations, nanofilms nanotubes. simulation model is based on experimental data without a priori assumptions to nature potentials interatomic interactions, compared them only after, which yields good agreement. quasi-flexural torsional modes,...

Based on the calculation and analysis of local Green’s functions impurity atoms low concentration in a two-dimensional graphene lattice, conditions for formation characteristics discrete levels with energies lying outside band quasi-continuous spectrum quasi-localized states near Fermi one are determined. Specific calculations were performed boron nitrogen atoms, which can actually replace carbon graphite nanostructures. For that forms spectrum, sufficiently simple analytical expressions...

We show theoretically a possibility to increase the superconducting transition temperature Tc of graphene by introducing defects. Eventually, peak local electron densities shifts Fermi level with above ambient in line recent observations.

The electron local density of states (LDOS) are calculated for graphene with isolated vacancies, divacancies and vacancy group four nearest-neighbor vacancies. A strong anisotropy behavior LDOS near Fermi level is demonstrated atoms defect. Effect next-to-nearest neighbor interaction on the properties vacancies established.

The mechanical properties of the half-Heusler alloy C2CaNa using density functional theory approach as installed in Quantum Espresso software was examined. We observed that will be easily compressed due to small value its bulk modulus. values lattice constant a0, elastic constants (C11, C12, C14), Young’s modulus E, Piosson’s ratio ν, Shear G, Zener anitropy A, pressure derivative B′, and band-gap Eg were obtained. Also Voigt approximation, Reuss approximation Voigt–Reuss–Hill average...

Abstract. The negative expansion observed at low temperatures in specific crystallographic directions of complex structures with anisotropic interactions is explained by microscopic analysis within the tight-binding, quasi-harmonic approximation lattice dynamics. results agree measurements on multilayer sandwiches transition-metal dichalcogenides, high-temperature superconductors and relevant nanostructures including carbon-based nanotubes.

The nature of flexural rigidity graphene monolayers and the formation quasi-flexural modes in graphite nanofilms is explained. It shown, that major part band quasi-continuous spectrum, do not practically couple with polarized plane layer. frequencies propagone zone are determined for phonons various polarizations. existence a high-frequency propagation demonstrated phonons. conditions quasi-local vibrations boson peaks analyzed different polarization. polarization analyzed.

Abstract: Artificial intelligence (AI) technologies have already played a revolutionary role in scientific research, from diagnostics to text-generative AI used writing. The use of the field needs transparent regulation, especially with longstanding history use—the first science were developed 1950s. Since then, has gone being able alter texts producing them using billions parameters generate accurate and natural texts. However, work requires high ethical professional standards, rise led...

The half-Heusler LiZnX (X = As, P, and Sb) alloys have gained a significant attention due to their exceptional thermoelectric magnetic properties, making them promising material for various applications. In this study, we employ density functional theory investigate the data on structural thermodynamics properties of alloys. First-principles calculations as implemented in quantum Espresso simulation software were used. We observed that will be easily compressed small value its bulk modulus....

Previous works have shown that high-level decision diagrams (HLDD-s) are suitable for system representation analyzing code coverage metrics. This is due to the fact HLDD models implicitly represent classical items, such as statement and branch coverage. However, research on properties of HLDD-s, which contribute accuracy assessment, missing. Current paper proposes a set manipulations in order generate would allow more stringent measurement without sacrificing performance, i.e., computation...

The made research results of the dependence film photovoltaic converters efficiency on their operating temperature and comparison are considered in paper. physical mechanisms influence analysis output, diode electronic parameters was conducted. coefficients converter, which make up for devices with a CdTe -0.14 rel.%/C, CuInSe -0.36 amorphous silicon -0.21 rel.%/C were obtained. analytical processing light characteristic effect PVC based showed that stability is ensured by current density,...