[PERSON]  
2 Department of Electrical and Computer Engineering, University of Thessaly, 38334 Volos, Greece;  
[EMAIL_ADDRESS] (G.K.); [EMAIL_ADDRESS] (R.V.) [PERSON]  
2 Department of Electrical and Computer Engineering, University of Thessaly, 38334 Volos, Greece;  
[EMAIL_ADDRESS] (G.K.); [EMAIL_ADDRESS] (R.V.) [PERSON] the prospect of using high-temperature superconductors as supersensitive sensors and electric current transmission lines with low energy losses operating in the region of liquid nitrogen's boiling temperature, the creation of a so-called \"controlled\" defect structure [9; 10; 15] in a superconductor has important fundamental and practical significance. Compounds of the YBa\({}_{2}\)Cu\({}_{3}\)O\({}_{7-8}\) system are among the most promising HTSC materials because of the following reasons: (a) these compounds have a fairly high superconducting transition temperature, Tc \(\approx\) 90 K (higher than the boiling point of liquid nitrogen); (b) single-crystalline samples of these compounds are relatively easy to grow, and their physical properties can be varied quite easily by modifying the oxygen concentration; and (c) they hold technological importance so they need to be stable under extreme external influences. The partial replacement of yttrium with praseodymium allows, unlike rare-earth elements, for a change in the Tc from the maximum value to 0 (antiferromagnetic insulator) while maintaining the degree of oxygen content at the optimal level (praseodymium anomaly). Thus, the application of electron irradiation or praseodymium doping makes it possible to tune the critical and electrical transport properties of Y\({}_{1-x}\)Pr\({}_{x}\)Ba\({}_{2}\)Cu\({}_{3}\)O\({}_{7-8}\) single crystals in a wide range. Note that, despite intensive experimental studies of the influence of various kinds of external influences on electric transport in the YBa\({}_{2}\)Cu\({}_{3}\)O\({}_{7-8}\) system [1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 20; 21; 22; 23; 24], there is only a small amount of scientific work devoted to comparative studies of the influence of electron irradiation and Pr doping on the pseudogap and fluctuation conductivity anomalies. At the same time, according to contemporary ideas, it is these \"unusual\" physical phenomena observed in HTSC compounds in the non-superconducting state that are critical to understanding the microscopic nature of HTSC, which is presently not fully explained, in spite of more than three decades of systematical experimental work. In previous studies [26], we studied the impact of relatively low irradiation fluences from 1.4 to 8.8 \(\times\) 10\({}^{18}\) e/cm\({}^{2}\), or of weak doping with praseodymium on the fluctuation conductivity (FC) and paraconductivity in YBa\({}_{2}\)Cu\({}_{3}\)O\({}_{7-8}\) single crystals with a stoichiometric composition. Here, we consider the effect of medium fluences (up to 100 \(\times\) 10\({}^{18}\) e/cm\({}^{2}\)) of irradiation with high-energy electrons or the effect of praseodymium impurities in a significant concentration range (0.0 \(\leq\)\(z\)\(\leq\) 0.5) on the fluctuation conductivity in Y\({}_{1-x}\)Pr\({}_{x}\)Ba\({}_{2}\)Cu\({}_{3}\)O\({}_{7-8}\) single crystals during the flow of a transport current in basic _ab_-plane.