Intrinsic inhomogeneities and effects of resistive switching in doped manganites

The effect of resistive switching in doped manganites being in the ferromagnetic state has been studied using resistive and magneto-optic methods. The visualization of magnetic structure of La0.75Sr0.25MnO3-x single crystals, and its transformation under electric current proposed local superheating of the material above the Curie temperature, which was supported by numerical calculation. The obtained results suggest a significant role of micrometer-scale inhomogeneity of manganites in phase separation, magnetic and transport properties of the material

Solution of a singularly perturbed parabolic problem by domain decomposition with time extrapolation

AbstractParallel iterative algorithms combining a time discretization and domain decomposition methods are applied to solution of a singularly perturbed parabolic problem. The domain decomposition methods are based on the Schwarz alternating procedure and time extrapolation. Convergence results for the iterative algorithms are established. Numerical experiments are presented to compare the effectiveness of the iterative algorithms on a shared memory multiprocesso

Spectrometric characteristics of soils of the subboreal zone of the eastern part of the Russian plain

© 2020 SPIE. The use of express methods for assessing of soil degradation degree is a global trend. Numerous studies suggest the possibility of using spectrometric methods for determination of chemical compounds in the soil. In this work, an attempt is made to determine the agrochemical parameters by spectrometric methods for agricultural soils of the subboreal zone of the east of the European Plain. The main types of spectrograms for gray forest soils and leached chernozems were determined and compared with the results of agrochemical analyzes at soil sampling points. The main regularities in indicators change depending on spectrometric curves type are analyzed. The results of the work can be claimed for express determination of agricultural soils degradation degree for a given natural zone

RECENT STATE OF THE THEORY OF THE METHODS OF INDUCED CONCENTRATION

A set of diagnostic methods called as methods of induced concentration (MIC) results in the same signal equation. The equation allows one to solve the direct and inverse problems. The method of Q-variation is described and its accuracy for many-electrode EBIC is numerically estimated. Nontraditional application of MIC is argued for relief investigation

Two-factor correlation analysis of the distribution of morphofunctional properties of mitochondria during irradiation

[No abstract available

Two-factor correlation analysis of the distribution of morphofunctional properties of mitochondria during irradiation

[No abstract available

Application of UAV and spectrometric survey results to determine agrochemical parameters of zonal soils used in agriculture (East of European Russia)

To determine the degree of degradation of agricultural lands for a key values (humus content, mobile potassium, mobile phosphorus, PH), the use of multispectral UAV materials synchronized with ground-based spectrometric imagery is proposed. Spectroradiometer HandHeld 2, soil acidity (pH) meter, satellite GLONASS-GPS receiver of geodetic class were used for field survey. Multispectral orthophoto obtained at the time of ground surveys using multispectral cameras Tetracam Micro-MCA 4 and Tetracam ADC-micro installed on board of the Supercam-S350F UAV. In parallel with the spectrometric work, samples of soils of different soil varieties and washout degree were taken, in representative sites of elementary soil areas. Laboratory studies were carried out with the selected samples, in order to determine the main agrochemical parameters: humus (%), mobile phosphorus (mg), mobile potassium (mg), pH (H2O). The work was tested on two field sites located in the Chuvash Republic (Russia), on cultivated (arable land) forest-steppe zonal soils (leached chernozems, dark gray forest soils). As a result of mathematical data processing, statistically significant relationships were obtained between certain groups of agrochemical indicators and spectral data in different channels of UAV images for specific soil varieties. In the course of the study, relationships were found between the green, NDVI, NIR, red channels obtained using the Supercam-S350F unmanned aerial vehicle and laboratory data: humus, phosphorus, potassium and soil pH. In general, the results of the experiment prove the fundamental possibility of using multispectral UAV materials, together with ground spectrometric imagery for automated express determination of agrochemical indicators of agricultural lands