KOLÁČEK STANISLAV, DOSTÁL PETR: Evaluation of dampers using a resonance adhesion tester. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2013, LXI, No. 6, pp. 1749-1753 This paper describes the diagnostics of dampers using resonant adhesion tester. This kind of test is non-invasive and evaluation is based on the EUSAMA methodology. The main goals of this method were to practically measure and evaluate technical condition of the shock absorbers. However, this method does not measure only damper properties, but the whole axle, too. During measurements, one must take into account the fact that the results can be easily infl uenced by external factors. These include e.g. wrong tire pressure, diff erent kind of shock absorbers, and tires. The actual testing revealed that the measurement results are also infl uenced by bad condition of the vehicle axles. If we eliminate all these draw-backs, dampers testing can be very accurate.

KOLÁČEK STANISLAV, ČERNÝ MICHAL: Latest aspects of mechanical fi ltration. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2013, LXI, No. 5, pp. 1535-1542 The aim of this study was to describe and unify all knowledge about mechanic fi ltration. The fi rst part deals with the parameters and properties of fi ltration. Here some important basic concepts are explained such as pressure gradient, fi lter life, etc. There's also a description of convenient fi ltration technology for coarse and fi ne materials, such as sand, smoke or soot. The second part primarily focuses on the real use and application of fi lters for liquid and gaseous media. The diff erences in construction between diff erent types of fi lters for fi ltration of fuels, oils, hydraulic fl uids, air and cabin fi lters are described. The last section is focused mainly on new materials for the production of fi lters. These materials are ceramic or nanomaterials, which can actually be enriched for example with antibacterial silver or some fungicides. fi ltration, fi lter, fuel, oil, air, nanofi bers

This paper deals with acoustic emission (AE) which was used to monitor group approximately ten pieces of honeybees in a glass jar. Acoustic emission is a part of the non-destructive methods and it is especially used for to monitor and detection defects of material on construction sites and industrial process. In the last time the acoustic emission was tested for very special objects such as to monitor of growth of plants or behaviour of insects. The mission this work was to apply a new experiment on the behaviour of colonies by means of acoustic emission, which it allows to capture waves and vibrations spreading in the material. Vibrations are one of the major parts of communication in the bee communities. Sensing colonies with the support of acoustic emission can be used for understanding of biological behaviour and reaction bees on diff erent kinds of stimuli. During the experiment were used two sensors for to monitor the activities of selected bees diverging from the normal state were observed. The sensor No. 1 was mounted directly on the glass with using a rubber strip. The sensor No. 2 was mounted on the steel sheet by using a clamp. Whole glass jar was isolated with polystyrene against disturbing waves through the environment. The non-destructive method of acoustic emission was scanned activity of the selected bee sample in the immediate vicinity for approximately thirty hours.

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