Frequency doubling and memory effects in the Spin Hall Effect

We predict that when an alternating voltage is applied to a semiconducting system with inhomogeneous electron density in the direction perpendicular to main current flow, the spin Hall effect results in a transverse voltage containing a double-frequency component. We also demonstrate that there is a phase shift between applied and transverse voltage oscillations, related to the general memristive behavior of semiconductor spintronic systems. A different method to achieve frequency doubling based on the inverse spin Hall effect is also discussed

Strategical development of agri-food corporations in the competitive economic space of Ukraine

This paper reports a study into the historical and economic preconditions for the strategical development of agri-food corporations in the competitive economic space of Ukraine. Agri-food corporations are determined by us as corporations with a developed system of integration relations that are a non-agricultural enterprise, which produces agricultural products. It has been substantiated that their emergence is not a natural phenomenon but a systematic process of changing the phases of differentiation and integration in the national economy. In this case, the development of agri-food corporations was contributed to by the lack of institutions of effective antitrust control, the diversification of industrial and financial groups, the liberalization of foreign trade, as well as a rent-oriented behavior of economic agents. It has been shown that agri-food corporations currently utilize about a third of agricultural land while the size of some of them exceeds the land-use area of entire regions. At the same time, in terms of agricultural production efficiency, agri-food corporations outperform farms and disintegrated agricultural enterprises, as well as family-owned farms; they have more resources for the innovative development of agricultural production and for investment. Strategical development of agri-food corporations needs to develop its social responsibility in rural areas, intensification of public control over the impact on the agrarian sector, institutional system of state support of export. Under the conditions of the state regulation of monopolies and excessive corporatization of agrarian sector, agri-food corporations should constitute the core of food security in Ukraine, as well as form its competitiveness in foreign agricultural markets

Mueller-matrix imaging polarimetry elevated by wavelet decomposition and polarization-singular processing for analysis of specific cancerous tissue pathology

Significance Mueller-matrix polarimetry is a powerful method allowing for the visualization of malformations in biological tissues and quantitative evaluation of alterations associated with the progression of various diseases. This approach, in fact, is limited in observation of spatial localization and scale-selective changes in the poly-crystalline compound of tissue samples. Aim We aimed to improve the Mueller-matrix polarimetry approach by implementing the wavelet decomposition accompanied with the polarization-singular processing for express differential diagnosis of local changes in the poly-crystalline structure of tissue samples with various pathology. Approach Mueller-matrix maps obtained experimentally in transmitted mode are processed utilizing a combination of a topological singular polarization approach and scale-selective wavelet analysis for quantitative assessment of the adenoma and carcinoma histological sections of the prostate tissues. Results A relationship between the characteristic values of the Mueller-matrix elements and singular states of linear and circular polarization is established within the framework of the phase anisotropy phenomenological model in terms of linear birefringence. A robust method for expedited (up to ∼15 min) polarimetric-based differential diagnosis of local variations in the poly-crystalline structure of tissue samples containing various pathology abnormalities is introduced. Conclusions The benign and malignant states of the prostate tissue are identified and assessed quantitatively with a superior accuracy provided by the developed Mueller-matrix polarimetry approach

Mueller-matrix imaging polarimetry elevated by wavelet decomposition and polarization-singular processing for analysis of specific cancerous tissue pathology

Abstract Significance: Mueller-matrix polarimetry is a powerful method allowing for the visualization of malformations in biological tissues and quantitative evaluation of alterations associated with the progression of various diseases. This approach, in fact, is limited in observation of spatial localization and scale-selective changes in the poly-crystalline compound of tissue samples. Aim: We aimed to improve the Mueller-matrix polarimetry approach by implementing the wavelet decomposition accompanied with the polarization-singular processing for express differential diagnosis of local changes in the poly-crystalline structure of tissue samples with various pathology. Approach: Mueller-matrix maps obtained experimentally in transmitted mode are processed utilizing a combination of a topological singular polarization approach and scale-selective wavelet analysis for quantitative assessment of the adenoma and carcinoma histological sections of the prostate tissues. Results: A relationship between the characteristic values of the Mueller-matrix elements and singular states of linear and circular polarization is established within the framework of the phase anisotropy phenomenological model in terms of linear birefringence. A robust method for expedited (up to ∼15 min) polarimetric-based differential diagnosis of local variations in the poly-crystalline structure of tissue samples containing various pathology abnormalities is introduced. Conclusions: The benign and malignant states of the prostate tissue are identified and assessed quantitatively with a superior accuracy provided by the developed Mueller-matrix polarimetry approach