Variation principle and the universal metric of dynamic routing

In this paper the variation principles from theoretical physics is considered that would describe the process of routing in computer networks. The total traffic which is currently served on all hops of the route has been chosen as the quantity to minimize. Universal metric function has been found for dynamic routing taking into account the packet loss effect. An attempt to derive the metric of the most popular dynamic routing protocols such as RIP, OSPF, EIGRP from universal metric was made.Comment: 4 pages, 3 figures, 14 equation

Finite-size effects on the magnetoelectric response of field-driven ferroelectric/ferromagnetic chains

We study theoretically the coupled multiferroic dynamics of one-dimensional ferroelectric/ferromagnet chains driven by harmonic magnetic and electric fields as a function of the chain length. A linear magnetoelectric coupling is dominated by the spin-polarized screening charge at the interface. We performed Monte-Carlo simulations and calculations based on the coupled Landau-Lifshitz-Gilbert and Landau-Khalatnikov equations showing that the net magnetization and the total polarization of thin heterostructures, i.e. with up to ten ferroelectric and ferromagnetic sites counted from the interface, can be completely reversed by external electric and magnetic fields, respectively. However, for larger system solely a certain magnetoelectrical control can be achieved.Comment: J. Phys.: Conf. Series. (2011) (to be published

Coupled dipole method for modeling optical properties of large-scale random media

We present an extension of the coupled dipole approximation technique to model optical properties of large-scale slabs of homogeneous and inhomogeneous materials. This method is based on a modification of the Green\u27s function to take into account the interaction between dipoles located at arbitrary distances within the slab. This method allows modeling of various aspects of the structural morphology of composite materials, including component size and spatial distribution as well as surface roughness effects. Our procedure provides an adequate description of far-field optical properties such as the specular and diffuse reflection of light

Stochastic sensing of relative anisotropic polarizabilities

We describe the concept of stochastic scattering polarimetry. This method allows determination of the anisotropic polarizability of a scattering object using a statistical analysis of the polarimetrically measured intensity distributions in the wave zone (far field). We show that this anisotropic polarizability may be determined even in situations where the state of polarization of the incident field is not known. The efficiency of the recovering procedure is demonstrated by several examples of light scattering in both far- and near-field geometries

Features of the calculation of heat loss for corner buildings with effective thermal insulation

This article discusses the problems of calculating heat losses through various corners of the outer walls of buildings with effective thermal insulation. An overview of three methods for calculating heat losses for these enclosing structures is made. The calculation of heat losses of three corner rooms of fundamentally different sizes was carried out according to the methods considered. The limits of using the calculation for specific heat loss are considered. The results of numerical modeling of heat losses through the corner enclosing structures are shown. The dependence of specific heat losses through the corners of the premises of the considered enclosing structures on the angle was revealed. © 2023 Author(s)

Features of the calculation of heat losses through the filling of window openings

The article is devoted to the calculation of heat losses through the filling of a horse aperture. The scheme of formation of the "cold bridge"through the filling of the window opening was presented. Two window designs were calculated and analysed using numerical simulation. It was calculated to reduce the cost of the project by changing the constructive solution. The article examined various ways to take into account the position of the window opening when calculating heat losses. A formula was proposed for the correct calculation of heat losses through the filling of a window opening. Separately highlighted issues that need to be considered in further research. © Published under licence by IOP Publishing Ltd

A new humic acid remedy with addition of silver nanoparticles

Previously known biogenic stimulator humic acid (HA) was the subject of this current study and HA based new remediation was developed by addition of silver (Ag) nanoparticles in its macromolecule. Extracted HA from a healing mud was characterized and used as reducing agent for Ag ion as well as a stabilizer for the formed Ag nanoparticles. The properties of the obtained hybrid composite were examined by XRD, UV and FTIR spectroscopic techniques. The diameter of the nanoparticles in the HA polymer was up to 8.6 nm and they were identified to be metallic Ag.DOI: http://dx.doi.org/10.5564/mjc.v13i0.151 Mongolian Journal of Chemistry Vol.13 2012: 7-1