Statistical methods are widely used at quality control of products and services. One of the main tasks of quality control with the help of statistical methods is control plan development. Planning control is a difficult task. In this connection, the present article offers an automation of planning control with a grapho-analytical method and a method of operating characteristics.

A developed methodology for evaluating measurement uncertainty during the tensile tests of metals and alloys is presented. In this connection, the various sources of uncertainty are considered. The object of studies included high-strength bolts made of 40Kh “Selekt” steel, which were subjected to tensile tests according to the GOST 1497-85 State Standard using a UMM-100 universal tensile testing machine. The basic sources of uncertainty in the measurement of relative elongation and reduction were shown to include repeated measurements of relative elongation; errors of measuring the finite length by a vernier calliper and marking the initial length of a calculated section, as well as the measurement error of the tensile testing machine. These also include operator reading error, repeated relative reduction measurements, as well as the error of measuring the sample diameter by a micrometer before and after the tests. During the measurements, temperature deviation was demonstrated to constitute an additional source of uncertainty when the ambient temperature is different from the standard temperature value ((20±5)°C). Assumptions underlying laws describing the distribution of input values were assigned. Tensile tests are shown to be characterised by two components of uncertainty evaluated as types A and B. A mathematical model constructed for measuring relative elongation and relative reduction during tensile tests is presented. The standard uncertainties of input values are evaluated based on the assumed laws of their distribution. A correlation between the final length of the calculated section, the diameter of the sample following the test, and the applied force, is revealed. Expressions for the calculation of sensitivity coefficients, which characterize variations in the output value (relative elongation) depending on variations of input values, were obtained. The total and extended measurement uncertainties were evaluated. Based on the performed studies, a procedure for evaluating measurement uncertainty when carrying out tensile tests of high-strength bolts was described. The evaluation of measurement uncertainty during the product testing was shown to be a rather labourconsuming work. In this regard, the authors propose the development of procedures for evaluating the measurement uncertainty during the tests with their inclusion into regulatory documents for control methods.

The current concern in the cosmetic industry is preparing of cosmetics products from aggressive preservatives-free natural, environmentally friendly ingredients, which would protect skin from external disturbance. The purpose of our work is to develop a biotechnological method for obtaining a cosmetic mask based on fermented curd whey in the presence of therapeutic mud. We used standard methods for determining microbiological and physicochemical parameters. The optimal concentration of therapeutic mud for fermentation was determined by quantitative estimation method of cells in the HMS nutrient medium after fermentation in pasteurized curd whey with the addition of different amounts of therapeutic mud. The result of the study is development of a cosmetic mask based on fermented whey mixture adding 10% of therapeutic mud of nutrient medium volume. The addition of therapeutic mud in an amount of 10% of nutrient medium volume contributed to increase of biomass of propionic acid bacteria up to 82×108 units and to the regulation of the pH of medium. Control of the finished mixture for microbiological, physical-chemical, organoleptic indicators showed the absence of pathogenic microflora and the content of propionic acid bacteria 1·108 units. The results of the study allow to characterize the ready mix as a product that combines biologically active substances, microelements, therapeutic mud hormones and metabolites of propionic acid bacteria, which can form the basis for the preparation of any cosmetics. The paper also proposes a method for preparing a cosmetic mask from fermented curd whey with propionic acid bacteria in the presence of therapeutic mud and a recipe for their manufacture with the addition of bentonite clay to stabilize the system. Prototypes of the obtained mask show skin elasticity and complexion improvement and smoothing of fine wrinkles.