Proper determination of unitary water demand and diurnal distribution of water consumption (water consumption histogram) provides the basis for designing, dimensioning, and all analyses of water supply networks. It is important in the case of mathematical modelling of flows in the water supply network, particularly during the determination of nodal water demands in the context of Extended Period Simulation (EPS). Considering the above, the analysis of hourly water consumption in selected apartment buildings was performed to verify the justification of the application of grouping by means of k-means clustering. The article presents a detailed description of the adopted methodology, as well as the obtained results in the form of synthetic distributions of hourly water consumption, and the effect of the COVID-19 pandemic on their change.

In this paper we present our systematic studies on the application of new organoboron compound as anion complexing additive in poly(ethylene oxide) dimethyl ether PEGDME-lithium salt. The anion trapping ability of this compounds is discussed regarding the type of various compounds, both triarylboranes as well as arylboronic esters. A possible mechanism of interactions is verified by the impedance spectroscopy, differential scanning calorimetry and vibrational spectroscopy methods.

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