The article substantiates the necessity of developing a theoretical model to study the influence of non-stationary processes on the shape of the recorded NMR signal in a weak magnetic field. Therefore, comparison of different ways of solving Bloch’s equations to describe the shape of the recorded NMR signals using a modulation technique is carried out. Moreover, mathematical models have been developed to describe the shape of the NMR signal, considering the peculiarities of its registration using modulation techniques in a weak field. Finally, the results of calculations, obtained by proposed methods, are compared with experimental data.
The article considers the problems of assessing the ecological state of the water body and the surrounding area in the municipalities of St. Petersburg. The necessity of using the methods of express-control to determine the state of different media to obtain reliable operational information. A new method of making an informed decision on the territory management based on the results of express-control is proposed. The results of the study of the water body and adjacent areas are presented.
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