ORIGINAL_ARTICLEThe paper presents the approach and empirical findings of a study on systematic land-cover change in the upper Western Bug River catchment in Ukraine. Landsat and SPOT images as remote sensing data are used for land-cover0 classification for the time steps 1989, 2000 and 2010. Thereby, three inner-annual scenes represent the vegetation development for each time step and facilitate classification with the Maximum Likelihood Classifier. Six classes are detected: artificial surface, broad-leaved and coniferous forests, arable land, grassland and water bodies. After this step, land-cover change detection over two decades is conducted. The observed against the expected gross loss and gross gain are statistically analyzed to identify the systematic and random land-cover changes in the study region. Results show that arable land changes not into artificial surface. Arable land changes into grassland and vice versa. This systematic change is very strong. The forest classes interchange whereat broad-leaved forest gains more from coniferous forest in the last decade.https://acc-ern.tul.cz/archiv/PDF/ACC_2016_1_01.pdf2016-06-3071810.15240/tul/004/2016-1-001Land coverSystematic land-cover changeWestern Bug RiverUkraineCorneliaBurmeister1AUTHORJochenSchanze2AUTHOR

ORIGINAL_ARTICLEThe paper deals with the experimental methods of determination of piezoelectric unimorph resonant frequencies essential for a design of acoustical systems. The characterization of piezoelectric unimorphs and their significant properties are brought in. Three broadband methods of determination of unimorph frequency response based on measurement of electrical impedance, acoustic pressure and vibration velocity are presented. The supposed methodology is verified by measurement of three unimorph samples. The efficiency and practical applicability of each method are further discussed.https://acc-ern.tul.cz/archiv/PDF/ACC_2016_1_02.pdf2016-06-30192410.15240/tul/004/2016-1-002Piezoelectric unimorphResonant frequencyMeasurementImpedanceAcoustic pressureVibration velocityJanaKoucká1AUTHORPetrPůlpán2AUTHORMartinPustka3AUTHOR

ORIGINAL_ARTICLEWhen determining the parameters of body composition with bioimpedance based methods, it is necessary to respect a number of conditions related to the measured subjects. A frequently cited limitation is the time difference of at least 8 – 12 hours between the acute physical stress and the measurement. The aim of this study was to determine the measure of the reaction changes in the body composition parameters before and during the process of recovery in top athletes and to specify the necessary time interval between the measurement and the load test VO2max on a treadmill ergometer.When measuring body composition with bioimpedance based methods immediately after stress and after 60 minutes of recovery, the changes in body composition values were neither statistically nor substantively significant; therefore, the measurement can be accomplished without distortion of the results due to, e. g., the loss or redistribution of fluids as a reaction to changes in stress. The results of our study did not prove the necessity of a minimum 8-hour interval between the load test VO2max and the measurements.https://acc-ern.tul.cz/archiv/PDF/ACC_2016_1_03.pdf2016-06-30253310.15240/tul/004/2016-1-003IvaŠeflová1AUTHORSoňaJandová2AUTHORKristýnaMrázková3AUTHOR

ORIGINAL_ARTICLEUnlike most organic compounds which undergo ready mineralization on illuminated and oxygenated semiconductors like TiO2, nitroarenes (from dye-, explosives- or polymer production), nitriles or multiply halogenated solvents are inert towards this kind of attack. However, they can be processed if strongly reducing entities are produced in such a semiconductor system. It is shown that the above kinds of refractory pollutants can be treated in formic acid (HCOOH) due to visible irradiation if combined with W, Nb or Bi oxide semiconductor slurries. Toxic functional groups are often removed entirely, e.g. with Hal (≠ aliph. F), CN whereas nitrobenzenes turn into anilinium ions and benzyl groups undergo rearrangement at Nb2O5. The method is broadly applicable and cheap.https://acc-ern.tul.cz/archiv/PDF/ACC_2016_1_04.pdf2016-06-30354410.15240/tul/004/2016-1-004StefanFränzle1AUTHOR