дефекти

Multi-walled carbon nanotubes and graphite nanoplatelets were functionalized via acid treatment to overcome the problem of agglomeration. Fourier transform infrared spectroscopy showed the chemical modification of the nanocarbons while the general relationship between the chemical treatment and the defects population was analyzed by Raman spectroscopy. The information regarding the mass loss and impurities is obtained from the thermogravimetric analysis. X-ray diffraction showed the effect of acid treatment on the physical states of the nanocarbons including the crystalline texture.

Tendencies of sustainable development of transport, the use of alternative energy sources, and requirements to the reduction of the carbon footprint on all stages of life cycle on all levels of road transport have led to the increase of the share of the electric car both at the first registration and used vehicles. The appearance of a large amount of used modern electric cars on the market caused the necessity to develop the procedures of provision their technical operation both by requirements of rational use and provision of traffic safety.

The expounded method of impulsive expose of defect of power transformer at excitation in him of damped oscillations by the periodic impulses of constant voltage. On the size of change of parameters of these vibrations at exploitation of transformer it is possible to estimate the origin of defects by the periodic diagnosticating and comparison of defectograms with normograms and to forecast development of defects and define possibility of after exploitation of transformer without the necessity of permanent or capital repair.