Acta Innovations

13-20

Authors: Dominik Grzesiczak, Przemysław Postawa

This article presents the possibilities of using the waste material obtained from the vehicle fuel tank (high density polyethylene PE- HD) as an addition to products. The waste material is added to the original polymer in an amount of 10% , 20% and 30%. The following tests have been performed during the research: differential scanning calorimetry DSC, static tensile test, hardness degree determined by pressing a steel ball, and also optical microscopy of obtained breakthroughs in samples made of liquid nitrogen. In addition, there has also been performed an analysis of mixture of original polyethylene that contains 10%, 20 % and 30 % of HD - PE polymer, which has been turned back for recycling from the production line. The aim of the research is to determine the recycling possibilities of polymeric materials obtained from the waste that emerged on the production line and in the fuel tanks of vehicles which were withdrawn from use as materials that during the utilization process have been subjected to a long-term connection with petroleum. Description of the mechanical and structural properties is an attempt to answer the question concerning usefulness of polymeric materials after utilization.

26-30

Authors: Monika Smaga

The article describes quality parameters of coffee grounds and tea grounds, as main components of a potential sustainable fuel. Samples were tested to determine the calorific value, humidity content, amount of sulfur and ash produced in the subsequent process. The research has shown that biomass consisting of coffee and tea grounds may become a high-energy, sustainable solid fuel. Additionally, the possibility of producing pellets from such materials has been tested and a suitable binder, which would allow forming granules of appropriate size, has been selected.

43-49

Authors: Grzegorz Szymański

The main objective of the study is to identify the forms of shopping among the Polish Internet users. The results of a survey conducted on the sample of over 13,000 respondents were analysed. Despite the dynamic development of the m-commerce sector, almost 90% of those polled use a traditional personal computer for online shopping. While analysing the results in terms of gender and the category of assortment, it was concluded that there are significant statistical differences. Men are more likely to buy in online shops, particularly large disparity was noticed in the pharmaceutical industry and the electronics and household appliances industry. While analysing the impact of the category of assortment on purchasing channel, differences exist in the area of tools, sport and pharmaceuticals where the products are more often purchased in conventional stores than in their online counterparts.