In the paper the formula for equation of the observation correction is introduced, which also includes observation terms, which are not the subjects of adjustment. The system of such type of correction equations is the basis for calculation of intermediary unknowns, which are not only the function of observations being the subjects of adjustment, but also of observations, which are not deformed by corrections. The paper presents proofs of formulae for calculation of mean errors of intermediary unknowns and functions of those unknowns for a considered case. An important general conclusion results from those proofs: both, the mean en-or of the ith unknown, and the mean error of the function of unknown, obtained from the discussed system of equations can not be smaller than the corresponding error obtained form a system, which does not include those observations. Presented formulae may be used in the case of adjustment of a connected network to higher order points, which co-ordinates are considered as observations, which are not the subjects of adjustment. Therefore we assume them as constant in a narrower range, i.e. we assume constancy of their values after adjustment; however their mean errors are considered in accuracy analysis. Derived formulae may be also used for calculation of mean errors of explicitly determinable geodetic constructions connected to known points, if the influence of mean errors of co-ordinates of those points on the mean error of a given function of unknowns is to be considered.

Construction projects are characterised by complexity in the technical, organisational and environmental sphere. The organisational complexity of such projects makes it necessary to manage relationships between actors who fulfil various functions. Formal organisational structures that have been developed for this purpose do not always reflect the actual relationships between construction project participants. In literature, scholars more and more often point to the need to identify and monitor such informal relationships and attempt to manage them in order to effectively carry out projects. Structural analysis of so-called self-organising networks of relationships between project participants is carried out on the basis of established structural measures by performing Social Network Analysis (SNA). In a situation when inappropriate communication between project participants relative to management staff expectations is detected, interventions meant to improve communication in such networks are possible. The goal of the article is proposing an optimisation-oriented approach to planning such interventions while taking various constraints, such as communication costs, into consideration. As a part of this optimisation, the authors proposed a method from the heuristic methods group. This solution will support decision-making in terms of intervening within an informal relationship structure. The method was presented on the example of an actual construction project involving the construction of a complex of housing buildings. the self-organising network structure was defined on the basis of a survey carried out among the project's participants and concerned communication between them over a four-week period. As a result of the structural network analysis, abnormalities in communication between project participants were detected. The optimisation method developed by the authors pointed to possibilities of improving communication effectiveness within this network. The effects of the analysis confirmed the application potential of the method that was presented.

In a rapidly changing environment due to globalization, we are constantly looking for appropriate paths and strategies for cities and regions while taking into account the territorialisation of growth factors. As a result, we can observe an increase in development concepts that seek to define the conditions for urban resilience that could result in sustainable development despite an unstable environment. The author places his reflections in the context of Upper Silesia’s conurbation development challenges. He examines the current path of the region’s development and analyses the role that the application of “smart city” and “creative city” concepts could play in this process. Rather than comparing the efficacy of the two approaches, he suggests a reflection on the proportions of different bundles inside the development process. He also highlights the limits of a smart city approach and shows to what extent those limits can be exceeded through the application of a creative city strategy. Due to the economic and social diversity of the Upper Silesian metropolitan area, there is a significant opportunity for the development of the creative economy that could determine the competitive advantage of this area in the coming decades.

This article has taken on contemporary relevance because of the acts of piracy off the coast of Somalia. The UN, NATO, the EU, and the IMO (International Maritime Organization) are addressing the issue of piracy. The African Union is also involved in security operations in Somalia. The author discusses the decisions of the Rome Convention (1986) on combating illegal actions taken against security at sea. It is also worth examining the legal rules accepted by ASEAN with the aim of combating maritime piracy in north-east Asian waters, especially in the Malacca Straits. These, however, do not remove the sources of piracy - poverty, the weakness of state organs, corruption, and the black market. The international community, mainly within the UN, should adopt legislation that will avoid and more effectively combat maritime piracy.

Considering the problem of fungal growth in living quarters, and especially after the buildings have been thermally insulated, learning more about mechanisms determining fungal growth in the conditions of day-today usage of such buildings seems to be a necessity. The research on indoor microclimate influence on fungal growth was carried out for too years in two pavilion type living quarters on a residential estate in built Wroclaw - Brochów. A microclimate fostering fungal growth was modelled in the pavilions. Samples of different building materials were exposed to and infected by fungi, and fungal growth was observed and analysed, with regard to the indoor environment. The paper presents the results of the first stage of the research (30 weeks).

Liquid-liquid extraction provides an environmentally friendly process as an alternative to azeotropic distillation, pervaporation and reverse osmosis because these techniques require the use of large amounts of energy, may involve volatile organic compounds, and operation at high pressure.

Ionic liquids (ILs) continue to gain wide recognition as potential environmentally friendly solvents due to their unique properties. However due to their current high cost, their use in industry is seriously limited without an efficient methodology for recovery and recycle.

In this paper we describe an innovative methodology for a liquid-liquid extraction process based on an electrically induced emulsion of an ionic liquid as the extracting solvent dispersed in an organic mixture. This offers a most efficient exploitation of the solvent. On the other hand we present our own design of a pilot (semi-industrial) scale extractor based on this methodology and which demonstrates effective recovery of the ionic liquid. In order to achieve this goal we used a numerical modelling tool implemented using our own simulation software based on the finite element method. We also used our original previous experience with generating and investigating liquid-liquid electrosprays using phase Doppler anemometry. Finally we present recommendations for contactor geometry and for the preferred operating conditions for the extractor.

Bogusław Wolniewicz created an original formal system based on his considerations on the ontology and semantics embedded in Wittgenstein’s Tractatus. His system – called by Wolniewicz ‘ontology of situations’ – can be complemented by a philosophical interpretation. In this article I identify the implicit and intuitive underpinnings of the system, its formal content and its philosophical implications. I also indicate a few applications of the system to axiology and logical hermeneutics.

Attitudes, or a person’s internal/mental beliefs about a specific situation, object or concept can greatly influence behaviors. This truth also applies to linguistic choices made by second language students. Their low level of knowledge of cross-cultural differences as well as pragmatic competence intertwined with inner norms and attitude towards politeness can result in producing the discourse which could not be considered appropriate. The fact of using and learning a second language (being bilingual or multilingual) may influence the level of politeness. The aim of this paper is to illustrate the differences existing in the scope of politeness revealed in the written, contrastive (Polish-English) discourse. The corpus under investigation encompasses seventy six emails written in the two languages by English philology students of teachers faculty. The analysis focuses on the level of politeness as exhibited through various forms of hedges and mitigations used both in the Polish and English language.