A method of identification of dynamic systems parameters with mathematical models described by ordinary differential equations with fractional derivatives is suggested.

The circuit of developed optoelectronic transducer of displacement into the time interval with compensation of conversion error occuring due to carrier frequency genertator amplitude instability – is considered. The compensation efficieney is determined.

The possibility of using phase–chronometric approach application at evaluation of gear coges working profiles wear during the redactor operation without its stopping and disassembly is described. The simplest mathematical model describing the redactor dynamics is given. A scheme of the test bed is presented.

The possibility of additions method application at determination of Platinum and Rhodium in waste ceramic-based autocatalysts by X-Ray fluorescence using powdered samples powdering and liquid additions is studied.