Brown Coal Bulletin, 2012 (vol. 52), issue 1

Reverse engineering in practise

Ing. Tomáš Kubín, Ing. Oldřich Učeň, Ph.D., Ing. Jan Blata, Ing. Vlastimil Moni

Zpravodaj Hnědé uhlí 2012, 52(1)

Angular cylinders are often damaged on the GLINIK 06/15 POZS mechanical reinforcement. One of reverse engineering methods - 3D scanning and subsequent transmission of the data to CAD model was used in order to establish the cause of the damage. The reinforcement was scanned by "HandyScan - EXAscan" device, which was provided by the SolidVision company. The data were processed using "Geomagic Studio 12" software. As a result, a collision between the angular cylinder and reinforcement shield has been detected.

First part of geophysical survey in the landslide area of the north-western slopes of the ČSA open pit mine

RNDr. Helena Valentová, Ph.D., doc. RNDr. Jan Nedbal, CSc., RNDr. Milan Neubert, RNDr. Jaroslav Jochman

Zpravodaj Hnědé uhlí 2012, 52(1)

The paper compares the measurements of hardness and dynamic mechanical properties of rubber cover layers performed on new belts and on belts exposed to different operating conditions over a long period. The results show that the interaction of rubber conveyor belts with the shipped material may play an important role in addition to the general aging. Changes in physical properties of rubber cover layers are then manifested mainly in the central part of the top cover layer which is in contact with transported material. The authors demonstrate that operation-induced changes in Young modulus and hardness of the top cover layer can heavily influence the...

Brown coal combustion ash properties produced in different combustion installations

Ing. Beáta Stehlíková, Ph.D., doc. Ing. Marián Košúth, Ph.D.

Zpravodaj Hnědé uhlí 2012, 52(1)

The paper presents results of a research on physical, chemical, and technological properties of brown coal combustion ash produced in dry bottom boiler and fluidized bed boiler. Possible utilisation of produced ash is determined by the presence of mineral formations which have pozzolanic properties. Research methods based on electron microscopy enable to determine individual parameters of tested types of ash. Mineralogical composition of different phases of ash indicates that mineral formations play an active role in solidification processes. The pozzolanic and cementitious properties of ash (as an ingredient in cement or concrete) are determined by...

Geological and pedological characteristics of the Most Lake shoreline - initiatory research results

RNDr. Michal Řehoř, Ph.D.

Zpravodaj Hnědé uhlí 2012, 52(1)

The paper briefly summarises pedological characteristics of soil along the Most Lake shoreline. Geological conditions and the course of reclamation works of the former Ležáky open pit mine are also described. Moreover, the results of pedological and geological mapping of the shoreline as well as the results of laboratory analyses of soil samples taken along the shoreline are presented. According to soil properties, the shoreline of the lake was divided into three parts.

Restoration of humus layer in stands of birch and blue spruce on a disturbed site in the Krušné Hory Mountains

Ing. Iva Ulbrichová, Ph.D., prof. Vilém Podrázský, CSc., Ing. Martin Kouba

Zpravodaj Hnědé uhlí 2012, 52(1)

The paper describes the development of forest soil surface layers on a bulldozed plot in the course of 20 years. The study plot is located on the flat top part of the Krušné Hory Mountain at 860 m a.s.l. The bedrock is formed by acid metamorphites (micaschist) and soil type is represented by Cryptopodzol - Podzol. The plot was afforested by the Blue (Colorado) spruce (Picea pungens). In 1984, sown Birch (Betula verrucosa) was also planted in the plot and later dominated in the stand. The results confirmed a favourable role of the birch in humus layer formation and positive influence on forest soil chemical characteristics (pH, soil adsorption complex,...

Mercury and the environment

Ing. Milena Vágnerová

Zpravodaj Hnědé uhlí 2012, 52(1)

Because of the high toxicity, mercury is getting to the centre of attention on the national, European, as well as worldwide level. Mercury can harm any living cell and this is why it is toxic for animals as well as plants. Mercury differs from other heavy metals in several physical and chemical properties. Atmospheric mercury emissions are monitored and may be linked to the long-range transport of pollution. From this point of view, mercury is very special as it can travel long distances in the atmosphere without any chemical changes. This was the reason why mercury was included in the Protocol on Heavy Metals of the Convention on Long-Range Transboundary...