https://ojs.uni-miskolc.hu/index.php/geosciences <p><big><strong>GEOSCIENCES AND ENGINEERING</strong></big></p> <p><big><strong>HU ISSN 2063-6997</strong><br /><strong>A Publication of the University of Miskolc</strong><br /><strong>UNIVERSITY OF MISKOLC</strong><br /><strong>Faculty of Earth and Environmental Sciences and Engineering<br />Miskolc, University Press<br />Hungary</strong></big></p> Miskolc, University Press en-US Geosciences and Engineering 2063-6997 https://ojs.uni-miskolc.hu/index.php/geosciences/article/view/2473 <p>The paper presents a new rock-physical model to describe the pressure dependences of the phase velocity and quality factor (Q). Acoustic laboratory data for P-wave velocity and Q factor were measured on the sandstone sample at 40 different pressures. The spectral ratio method was used to measure the Q factor data utilizing an aluminum sample (with the size and geometry of the rock sample) as a reference. The measured velocity and Q factor data were processed in an inversion procedure. The results showed that both the velocity-pressure and the Q factor pressure dependence can be well-described utilizing the newly developed rock-physical model in forward modeling. From the estimated inversion parameters, <em>v_p</em> and <em>Q</em> can be calculated for the full pressure range.</p> Brigitta TURAI-VUROM Mihály DOBRÓKA Copyright (c) 2023 Geosciences and Engineering 2023-12-04 2023-12-04 12 1 5 19 https://ojs.uni-miskolc.hu/index.php/geosciences/article/view/2432 <p>A significant amount of hydrocarbon contaminants (therefore heavy metal components) has remained in the soil due to careless industrial activities. Effective remediation is difficult, especially in low-permeability soils because it is extremely difficult to get desorption. A lot of research has been conducted on extreme soil acidification, batching of oxidants, air-fluid injection and electrokinetic treatment, there were successful but due to the risk from extreme loads, these methods can only be used solely in controlled ex-situ environments. This paper investigates an eco-friendly in situ treatment with carbamide peroxide in low-permeability silty clay. After several repetitions, the result of tests proved Cu component was fully adsorbed on clayey-silt among applied concentration and circumstances which applied, while two other components were partially adsorbed. Moreover, the experiments carried out to enhancement of desorption proved to be successful for Cu, Zn and Mn with carbamide peroxide.</p> Tamás BACSÓ Márton TÓTH Copyright (c) 2023 Geosciences and Engineering 2023-12-19 2023-12-19 12 1 20 30