Modern road surfaces are subject to intense wear due to the effects of studded tires and deicing agents, which leads to significant economic losses. In Russia, the annual damage from such wear is estimated at hundreds of billions of rubles. To increase the durability of asphalt concrete, methods for modifying bitumen binders are being investigated, including the addition of rubber chips, polymers (SBS, EVA) and modified sulfur.
The most promising direction is the use of modified sulfur, which improves wear resistance, crack resistance and stability.
to deicing reagents. The article describes in detail the process of obtaining modified sulfur, including degassing and modification with 5-ethylidene-2-norbornene (ENB). Laboratory tests have shown that the optimal sulfur content in bitumen is 25-30%, while 30% demonstrate the best characteristics: increased heat resistance, shear stability and adhesion to mineral aggregate.
The results of IR spectroscopy confirmed the physical mixing of sulfur with bitumen without chemical reactions. The use of modified sulfur makes it possible to increase the service life of road surfaces and reduce repair costs, which is especially important in the context of an increasing sulfur surplus in the Russian Federation.

Keywords: road surface, asphalt concrete, wear resistance, wear gauge, studded tires, modification, degassing, sulfur, bitumen binder, ecology

The questions of mathematical interpretation of results of trajectory measurements are discussed in terms of increasing the accuracy of identification of bearings of unmanned aerial vehicles during their movement in a "swarm" - a group. Variants of identification of horizontal and spatial bearings are offered. For each of the variants, criteria are proposed for identifying the belonging of the measured values ​​to the same object in the group and the conditions for achieving them. The situation of false positives is shown. It is determined that additional identification measures are needed to eliminate false bearing triads and uncovered ambiguities, including the use of combinatorial exhaustive search algorithms. For their study, it is necessary to develop an experimental statistical model with an algorithmic description of cause-effect relationships, which is a further development of this work.

Keywords: " unmanned aerial vehicle, group of objects, bearing identification, horizontal bearing, spatial bearing, identification criteria, false notch"

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