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framework of the research procedure for this review paper is presented in Fig. 2 . This information can help the researchers to learn the scope of concentration. Fig. 2. A framework of the search procedure in this review paper The keywords are chosen by two

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The aim of the paper is to determine a methodology for calculating the needed airflow rate (including fresh air) in an occupied room, based on carbon dioxide measurement and calculation, in order to maintain the comfort indoor air quality. The calculated airflow rate should optimize the investment and the operating costs of HVAC equipment. In the work there are analyzed the calculation methods used to determine the ventilation airflow rate. It is presented the methodology for calculating the ventilation airflow rate for a room with people inside by using the measured values of carbon dioxide concentration. The connection between carbon dioxide concentration and ventilation airflow rate is verified by experimental measurements. This methodology is applicable in Slovakia because it complies with all current standards. The result obtained by using this calculation method is almost the same with that achieved from experimental measurements. To confirm the results, it is presented a case study of an office with occupants, in which the ventilation airflow rate calculation method is applied.In the article only a part from the total work is presented. The experimental measurements were carried out from 2011 to 2014. Approximately 54 measurements were covering total days or weeks. The following factors have been measured: indoor air temperature, outdoor air temperature, relative humidity of indoor air, relative humidity of outdoor air, concentration of CO2 in indoor air, concentration of CO2 in outdoor air, pressure difference and wind velocity. Ventilation by infiltration was calculated based on these factors using several methodologies. The methodology of measurement is not subject to the article. In this article only one aspect is investigated: CO2 concentration.

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products formed during hydrolysis. The metabolism of these compounds results in the formation of alcohols, ketones, CO 2 , H 2 S and, mainly volatile organic acids, with acetic, propionic and butyric acids found in higher concentrations [ 10, 14 ]. The

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for gas concentration tolerances . [2] Palko M. ( 2014 ), Physical assessment of a window using a computer simulation . Advanced

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corrosion, a passive oxide adherent film is usually formed in various environments. The amphoteric nature of the oxide film causes it to dissolve significantly when the metal is placed in a high concentration of acidic or basic media [ 5 ]. After the oxide

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of inhibitory secondary metabolites but lower concentrations of phytochemicals as in the case of Jatropha curcas [ 7 , 8 ] determined qualitatively was synergized with another extract of fewer phytoconstituents but of higher concentration

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such as groove, fillet, and holes (i.e., notches) that, due to the phenomenon of stress concentration, can produce extensive plastic deformation even at applied stresses lower than the elastic limit. Besides, the presence of notches induce a multiaxial

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Detailed analysis of household generated greywater (GW) samples is an essential task for the design of treatment systems before reuse. In this paper modern analytical methods will be discussed, which were applied to determine the ionic and elemental concentration of different GW samples. Ion chromatography (IC) and Microwave plasma atomic emission spectrometry (MP-AES) methods were used to spoor the composition of GW samples. It was shown that from the IC results and from calculated parameters (Na ee% and SAR) the application of raw or treated GW flows for irrigation is controlled. According to the elemental concentration, GW samples from laundry/kitchen sink and dishwasher proved to be the most contaminated compared to drinking water, while the concentration of the measured elements did not elevate as significantly in GW samples from shower/bathtub.

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Abstract

The aim of this article is to examine the effect of temperature, humidity, air velocity and CO2 concentration regarding the human behaviour in indoor environment with natural ventilation, i.e. without a ventilation device, or where there is forced ventilation or an air conditioning.

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Abstract

This paper presents the results of the floristical examinations performed in the units of a former secondary sedimentation pond system in Hungary. The outcome of analyses on the chromium content of the plants is discussed. Beside the chemical analyses, observations on the plants, the characterization of the ecological state of plant stands adapted to heavy metal load. Results of the elemental analysis for heavy metals revealed that none of the plants constituting the natural vegetation can be treated as hyperaccumulator plant. A green cover and the detoxification process of Cr(VI) by plants is suggested to be more important than the present extensive phytoextraction procedure. It can be stated that due to the disturbance our investigated area has diverse vegetation, in addition these plants can tolerate a high concentration of heavy metals, and they are able to take up them.

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