14 research outputs found

    About some economic applications of cohort analysis

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    Nowadays, there is the problem of evaluating the return on advertising costs for industries with a delayed conversion. Cohort analysis is a series of studies which are conducted at certain time intervals. Using cohort analysis we can better assess the effectiveness of advertising channels for industries with a delayed conversion. Cohort analysis can be used to analyze following items: efficiency in the context of "traffic sources", usefulness of changes on the web site; assessment of effectiveness of marketing campaigns; assessment of impact of seasonality on the behavior of the user; the decision-making period. The article presents an overview of tools we can use to collect data for analysis. The article also describes the method of selection and the variants of the cohorts to construct the analysis. For demonstration of the proposed method and calculation variant, there is considered the practical example of building a cohort analysis. Using these method and the example of calculating, the companies with delayed conversion can analyze the effectiveness of Internet advertising for different advertising channels. © 2018 Author(s)

    Терапевтическая роль полиненасыщенных жирных кислот и их производных в патофизиологических процессах

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    This review presents literature data on studies of the therapeutic role of natural polyunsaturated fatty acids and their derivatives in the processes of inflammation, cancer, and immune response.В настоящем обзоре представлены литературные данные, посвященные исследованиям тера-певтической роли природных полиненасыщенных жирных кислот и их производных в процессах воспаления, опухолеобразования, иммунных реакциях

    THE INFLUENCE OF FLOW OF AIR SUPPLIED ON MIXING DURING PRECIPITATION, ON GRANULOMETRIC COMPOSITION AND FLUID DENSITY OF URANIUM CONCENTRATE

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    The influence of the flow rate of air fed into the stirring reaction pulp on the particle size and bulk density of the uranium concentrate was investigated. The largest values of the average particle diameter and the bulk density after shaking for the pH value of the precipitation 7,0 were obtained with the stirring of the reaction pulp at an air feed rate of 10 L/min, and for a pH of 6,7 at an air feed rate of 15 L/min

    STUDY OF SCANDIUM SORPTION KINETICS BY PHOSPHOR CONTAINING IONITS

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    The kinetics of scandium recovery from stoichiometric neutral solution of scandium sulfate with initial concentration of scandium 118,02 mg∙L-1 by phosphor containing ionexchangers Tulsion CH 93, Lewatit TP 260, Purolite S 950, Purolite D 5041 and Purolite S 957 was investigated by interrupt method in dynamic mode. Scandium sorption by ampholytes Tulsion CH 93, Purolite S 950, Lewatit TP 260 and cation-exchanger Purolite D 5041 takes place in internal diffusion mode or is limited by the chemical reaction stage. Conversely,scandium sorption by chelating resin Purolite S 957is carried out in the external diffusion mode

    Therapeutic role of polyunsaturated fatty acids and of their derivatives in pathophysiological processes

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    This review presents literature data on studies of the therapeutic role of natural polyunsaturated fatty acids and their derivatives in the processes of inflammation, cancer, and immune response
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