The construction site and its elements create circumstances that are conducive to the formation of risks to work safety during the execution of works. Analysis indicates the critical importance of these factors in the set of characteristics that describe the causes of accidents in the construction industry. This paper attempts to analyse the characteristics of the construction site to indicate their importance in defining the circumstances of an accident at work. The research was carried out on the basis of data from the register kept by the District Labour Inspectorate in Krakow, Poland. Main substantive tasks include isolating patterns of accidents on site and identifying those of the analysed characteristics that are important in defining these patterns. In terms of methodology, the paper presents a method of analysing data resources by using means of conceptual grouping in the form of cluster analysis.

„Pionierzy Palestyńscy” zaczęli w zorganizowanych grupach przyjeżdżać do Gdyni w 1934 roku. Mieszkali w kibucu zwanym Żydowskim Ośrodkiem Pracy „Hechaluc- Pionier – Gordonia” i znajdowali zatrudnienie w działających w porcie firmach o kapitale żydowskim. Po zakończeniu przeszkolenia zawodowego organizacje syjonistyczne oraz zarząd Komisji do Spełniania Zadań Gminy Żydowskiej w Gdyni kierowały ich do Palestyny. „Gordonia” przygotowywała ich do emigracji pod względem zarówno zawodowym, jak i kulturalnym. Kształciła równie starannie w zakresie żeglarstwa i rybołówstwa, jak i znajomości języków hebrajskiego, angielskiego oraz na kursach ogólnokształcących. Zajęcia instruktażowe prowadzili kpt. Gustav Pietsch i inż. Leon Komorowski, a praktykę rybacką na wodach Zatoki Gdańskiej i Puckiej nadzorował gdyński rybak Józef Koss. Przeszkolenie odbywało się według zasad przyjętych dla tego typu kursów w Europie Zachodniej. Ogółem w latach 1936–1939 przez kibuc przewinęło się przynajmniej 77 osób z różnych zakątków II RP. Założony przez nich w Palestynie w 1939 roku kibuc Neve-Yam stał się bazą szkoleniową dla kolejnych grup młodych „Pionierów” z Europy Środkowo-Wschodniej.

In this paper a sample rate conversion algorithm which allows for continuously changing resampling ratio has been presented. The proposed implementation is based on a variable fractional delay filter which is implemented by means of a Farrow structure. Coefficients of this structure are computed on the basis of fractional delay filters which are designed using the offset window method. The proposed approach allows us to freely change the instantaneous resampling ratio during processing. Using such an algorithm we can simulate recording of audio on magnetic tape with nonuniform velocity as well as remove such distortions. We have demonstrated capabilities of the proposed approach based on the example of speech signal processing with a resampling ratio which was computed on the basis of estimated fundamental frequency of voiced speech segments.

Contemporary design of food labels use different landscape pictures. Using the landscape in trade and market as a way of serving the message has long history and is very common. It was the main reason to create the concept of consumers landscape. According to research results two basic landscape images were observed — images of real landscape (pictures of recognizable and existing places, sites, cities, buildings, etc.) and images of imaginary landscape (imaginary view suggesting the certain type of landscape). The results of conducted researches could be helpful in recognizing the difference between real landscape and imaginary landscape. Conducted researches could be used not only in landscape architecture, but also in trade and marketing. Wide range of phenomenon called consumers landscape allows for expanding the studies on the dependency between a landscape vista and recognizing and selling the product.

The main objective of these experiments was to study the oxygen mass transfer rate through the volumetric mass transfer coefficient (kLa) for an experimental set-up equipped with a rotating magnetic field (RMF) generator and various liquids. The experimental results indicated that kLa increased along the magnetic strength and the superficial gas velocity. Mathematical correlations defining the influence of the considered factors on kLa were proposed.

GIS programs are used for the collection and processing of geographic data, however, they are also useful in the study of historical greenery. GIS allows better use of the archival and contemporary cartographic materials, collect data on individual objects, make precise measurements of the areas, track changes in use and land cover. The paper presents examples of the GIS software use, based on research related to the historical greenery in Wielkopolska region.

The aim of the study was to present an experimental investigation of the influence of the RMF on mixing time. The obtained results suggest that the homogenization time for the tested experimental set-up depending on the frequency of the RMF can be worked out by means of the relationship between the dimensionless mixing time number and the Reynolds number. It was shown that the magnetic field can be applied successfully to mixing liquids.

This work reports on cadmium and lead contaminations in the edible snail Helix pomatia harvested in Poland. One hundred and 24 samples of Helix pomatia meat collected from seven provinces (voivodeships) of Poland were analyzed for their trace metal levels by graphite furnace atomic absorption spectrometry (GFAAS). The research was conducted in 2 stages. The 1st stage analyzed snail meat prior to any further technological treatment (raw meat). In the 2nd stage, the trace element levels were measured in meat subjected to technological treatment (processed meat). The trace element contents in raw meat samples ranged from 0.06 mg kg-1 to 0.22 mg kg-1 for Cd and from 0.06 mg kg-1 to 0.18 mg kg-1 for Pb. The analyses revealed an increase in the cad- mium content from 0.12 mg kg-1 to 0.18 mg kg-1 in thermally treated snail meat and no changes in lead concentration during the two-stage heat treatment. Regulation (EC) 1881/2006 does not specify the Cd and Pb residue limits in meat of terrestrial edible snails. The limits are set for in- vertebrate aquatic organisms meat (i.e. shellfish, mollusc, cephalopod) and range from 0.5 mg/kg to 1.5 mg/kg of tissue fresh weight for Pb and from 0.5 mg kg -1 to 1 mg kg-1 for Cd (EU Commis- sion 2006). The results demonstrate that the land snail Helix pomatia has a tendency to bioaccu- mulate trace elements, and the cooking process is likely to affect (increase) the Cd content in the snail meat.