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The changes that have occurred in dairy industry reflect both up- and down-stream sectors. These changes, coming due to transition of the economy, were of dynamic, often radical character. Very string links among the dairy industry, the producers and local markets were also an important issue considering the transformations in dairy sector. During 7 years of transition the dairy industry has shown a reasonable ability to radical and quick adjustment to new economical conditions. This branch experienced deep restructuring from the production approach to market oriented one. However, for the time being it is still subjected to continuous process of adjustments towards changing consumer preferences.
Scharakteryzowano małe zakłady przetwórstwa rolno-spożywczego na obszarach wiejskich, uwzględniając ich liczbę, zatrudnienie, zdolności produkcyjne i ich wykorzystanie. Doceniając znaczenie tego przetwórstwa na obszarach wiejskich odniesiono się do kwestii dalszego ich rozwoju.
Article Deals with problem of naval fuels’ microbial contamination. This problem in Poland is not well known and described, but operational problems encountered very often prove that this is a very serious problem. Examples of laboratory tests performed on real samples are presented as well as possible effects of microbial contamination are discussed. Authors also suggest continuous monitoring of naval fuels as main preventive tool. Article covers following topics: • general information about microorganisms present in naval fuels • conditions necessary for microbial growth, with special attention to conditions encountered on vessels • operational problems resulting from microbial contamination • methods of microorganisms detection and examples of preventive actions
This article concerns the issue of thermal degradation process of fuels, important from the perspective of the operation of turbine engines, especially in the context of new fuels/bio-fuels and their implementation. The studies of the kerosene-based jet fuel (Jet A-1) and its blends with synthetic components manufactured according to HEFA and ATJ technology, were presented. Both technologies are currently approved by ASTM D7566 to produce components to be added to turbine fuels. Test rig investigations were carried out according to specific methodology which reflects the phenomena taking place in fuel systems of turbine engines. The mechanism of thermal degradation process was assessed on the basis of test results for selected properties, IR spectroscopy and calculation of activation energy. The results show that with the increase of the applied temperature there is an increment of the content of solid contaminants, water and acid for all tested fuels. Thermal degradation process is different for conventional jet fuel when compared to blends, but also semi-synthetic fuels distinguished by different thermal stability depending on a given manufacturing technology
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