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The studies on the effects of winter wheat cultivation technology and spring barley varying degrees of intensity on productivity, carried out in All-Russian Scientific Research Institute of Agriculture and Soil Protection, allowed a detailed analysis of the positive and negative aspects of these technologies usage, and also they let us define that when the intensification indicators increase the productivity of studied crops increases as well, together with simultaneously reducing of productivity varying on years....

The paper presents experimental results obtained in determining the chemical composition of the base material- heat affected zone ? filler material in reworking by ultrasonic welding field. The work shows the curve of the concentration of carbon, nickel, chromium, molybdenum, iron, tungsten, silicon and cobalt in the resulted material couple. There are presented differences between reworking in ultrasonic field and common welding process. The analysis of the results obtained and presented in the paper shows the fo...