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The phenomenon of artificial soil compaction occurs everywhere when moving on foot or by car and soils are covered by ponding water, even after relatively small rains (due to succesive passages on soil surface, succesive rains or the absence of adequate recovery works of soil structure). This phenomenon was intensively studied by researchers in our country and abroad, using specific equipment and instruments that allow to determine various parameters that characterize the artificial compaction of soil. This paper presents the most important devices, experimental stands and equipment used for the study of soil compaction, highlighting the measurement method and the parameters which can be determined. [ABSTRACT FROM AUTHOR]

Within this paper are presented the results obtained from the pressing sunflower seeds using a screw press having constant diameter, with circular holes for oil drainage and a single nozzle for cake outlet. From the results it was observed the dependence between the oil yield and the nozzle diameter, the variation of the oil percentage expressed along the pressing chamber and the influence of nozzle diameter on the specific energy consumed for pressing the material. The experimental results were subjected to regression analysis using Microcal Origin version 7.0 program. [ABSTRACT FROM AUTHOR]