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The conformational properties of bottle brushes with identical backbone lengths, grafting densi ties, and molecular masses of side arms, but different architectures of the arms, are studied via the Langevin dynamics method within the coarse grained model. Volume interactions correspond to athermal solvent conditions. The sizes and shapes of a whole macromolecule and its backbone and the mutual arrangement and deformation of the side arms are determined. The induced persistence length of the brush backbone, a property that characterizes the rigidifying effect of interactions between side arms, is estimated. It is shown that, for the considered model parameters, the induced persistence length is independent of the side arm architecture, in agreement with predictions obtained earlier in the mean field approximation.

This paper is dedicated to the topical problem of examining permafrost’s state and the processes of its geocryological changes by means of geophysical methods. To monitor the cryolithozone, we proposed and scientifically substantiated a new technique of pulsed electromagnetic cross-well sounding. Based on the vector finite-element method, we created a mathematical model of the cross-well sounding process with a pulsed source in a three-dimensional spatially heterogeneous medium. A high-performance parallel computing algorithm was developed and verified. Through realistic geoelectric models of permafrost with a talik under a highway, constructed following the results of electrotomography field data interpretation, we numerically simulated the pulsed sounding on the computing resources of the Siberian Supercomputer Center of SB RAS. The simulation results suggest the proposed system of pulsed electromagnetic cross-well monitoring to be characterized by a high sensitivity to the presence and dimensions of the talik. The devised approach can be oriented to addressing a wide range of issues related to monitoring permafrost rocks under civil and industrial facilities, buildings, and constructions.

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