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In this work, samples of field-effect transistors were fabricated based on solid solutions of transition metal dichalcogenides and their spectral characteristics were studied using photocurrent spectroscopy. The results of a theoretical estimate of the total optical absorption of two-dimensional semiconductors at different thicknesses of the sample and for different wavelengths of optical radiation with allowance for multibeam interference are presented. It is shown that interference effects make a significant contribution to the change in the shape of the spectral characteristics of optical sensors with a change in the thickness of the photosensitive layer of transition metal dichalcogenides.

This work consists of the characteristics of production, assessment of the qualitative and quantitative composition of water, consideration of the process of water purification in the chemical shop, comparison and selection of coagulants and flocculants, and demonstration of the most affordable technology used at the CHPP which increases the efficiency of source water purification. The problem of pretreatment of the source water has always been relevant. The quality of the water used depends on the operation of boilers and turbines at the CHPP. The paper presents the average annual indicators of the quality of the source water, pre-treatment methods, and considers which reagents that do not require the cost of reconstruction of clarifiers can improve their performance. The initial water after the application of the test samples of coagulants and flocculants was studied. Conclusions are drawn about the work of clarifiers after the use of the proposed reagents.

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