The presented paper concerns a novel concept of hybrid piezoelectric motor based on electroactive lubrication principle. Its structure is combined of quasi-static and resonance piezoelectric actuators, synchronizing their work to generate the rotary movement. The hybrid motor topology is compared to the existing piezoelectric motors, regarding its field of applications in embedded systems with very high security requirements. The electroactive lubrication principle is briefly presented with regards to optimization of the hybrid motor. The performance principle of the hybrid motor is described in terms of its working cycle. The assembling process of the prototype hybrid motor is briefly explained with emphasis put on the frequency and impedance tuning of the applied quasi-static and resonance piezoelectric actuators. Next, the hybrid motor power supply system is described and chosen measured performance characteristics are presented. Finally, conclusions concerning the features of the tested prototype hybrid motor and possible solutions of the faced issues, during assembling and testing, are presented.

The author is an employee of the City Spatial Planning Office of Kraków and describes the process of adopting Local Spatial Management Plans of the area in Krakow, which was inscribed on the UNESCO World Heritage List. The description begins in 2003 with no Local Spatial Managements Plans in valid, and ends in 2020, when the UNESCO area is completely protected by local spatial plans, however 50% of the buffer zone stays without any spatial law protection. The article focused on the authors of Local Plans, who — on behalf of the Mayor of the City of Krakow — drawn up the spatial documents. The documentation of this aspect is tremendously important, after deregulation of the profession of urban planners.