№4-2021

DOI: 10.32758/2071-5951-2021-1-4-20-26 How to certify reference materials: by voting or by exact weights

DOI: 10.32758/2071-5951-2021-1-4-29-34 Effect of reaction time on the process of upgrading heavy oils in the presence and in the absence of oil soluble catalysts at 250 ° C.

DOI: 10.32758/2071-5951-2021-1-4-36-39 MELANGETM technology of the bitumen production in one-stage without oxidation

DOI: 10.32758/2071-5951-2021-1-4-42-53 Overview of modern multifunctional gasoline additives. Market, key components, and methods for evaluating their effectiveness.

DOI: 10.32758/2071-5951-2021-1-4-54-59 Digital monitoring system of equipment for the analysis of fuel and lubricants quality

DOI: 10.32758/2071-5951-2021-1-4-60-64 Mixed esters of xanthogenic acids containing carbonyl, dithiocarbamine and thiocyane group and their research as additives improving tribological characteristics