Volume 20 (2012): Issue 2 (June 2012)

This article deals with the spectral radiative properties of coatings consisting of hollow ceramic microspheres. They were selected from the commercial coatings available in the Slovak and Czech Republics. The aim was to measure and compare their spectral emissivity properties with standard facing coatings by means of infrared spectroscopy. The measured data demonstrates that the coatings have the same radiative properties as a standard building coating. Two reflective measurement methods (DRIFT and ATR) were used for this purpose. These results have been compared, and the DRIFT method was finally recommended for determining the spectral radiative properties of the materials measured.

Budgetary indicators, such as technical-economic indicators, are valuation tools commonly used in assessing indicative costs in civil engineering. Their applications are used across the professional construction spectrum, from preparation of the investment process to checking implementation of the construction, in the banking, insurance and property value estimation systems. The catalogues of specific financial indicators may have significant differences between them. These differences can result from different ways of processing the catalogues. As a result of the differences, situations may occur in practice in which a disparity pertains between the values obtained and the effect of the results of planning, implementation, monitoring or other activities related to the buildings.

The paper deals with a project for the measurement and evaluation of a unique local spatial network with a high degree of accuracy at the MCE Slaný Company. The accuracy requirements were very high; the standard deviation in measuring the components of a steel construction before its final assembly is about ones of millimeters.

This article deals with the regionalization of low flow regimes lower than Q₉₅ in Slovakia. For the regionalization of 219 small and medium-sized catchments, we used a catchment area running from 4 to 500 km² and observation periods longer than 20 years. The relative frequency of low flows lower than Q⁹⁵ was calculated. For the regionalization, the nonhierarchical clustering K-means method was applied. The Silhouette coefficient was used to determine the right number of clusters. The principal components were found from the pooling variables on the principal components. The K-means clustering method was applied. Next, we compared the differences between the two methods of pooling data into regional types. The results were compared using an association coefficient.

The paper evaluates the results of data obtained from two years of observing an actual domestic wastewater treatment plant (WWTP) with an immersed membrane module. The domestic MBR (membrane bioreactor) WWTP was linked to a dwelling with four residents. Two different commercial flat sheet membrane modules were investigated. The membrane modules, as well as the whole WWTP, were tested with different fluxes as well as the response of the membrane and activated sludge to different conditions, such as actual peak wastewater flows, extremes temperatures (a winter below 5 °C), and high pH values.