Rail transport plays a key role in the transport of passengers and goods. The high demand for effective means of flaw detection of high-speed rails, which is an important component of railway safety, is justified by the constantly growing number of vehicles and their speed [2]. Failure of elements of the railway infrastructure entails huge losses. In this regard, the analysis and forecasting of the state of elements of the railway infrastructure is an urgent task. This article analyzes modern methods for diagnosing the state of a rail track from a mobile bogie or a conventional locomotive. A method for diagnostics of a rail track is proposed, based on registration of vibrations near the rolling surface of rails and processing these signals using neural networks.
Keywords: rail flaw detection, wheel surface, algorithm, IMM, MEMS, control system, inertial sensor, rail defect, contactless measurement
Experimental studies on the formation of nanoscale structures on the surface of gallium arsenide were carried out. To obtain a modified layer on the substrate surface, the method of focused ion beams was used, and the method of plasma-chemical etching was used for the subsequent formation of structures. According to the research results, structures with a width of 90 to 196 nm and a depth of 2 to 9.6 nm were formed. The results of the studies can be applied as structures for the subsequent formation of quantum dots during molecular beam epitaxy.
Keywords: Nanotechnology, focused ion beam, plasma treatment, atomic force microscope, GaAs