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

USAGE PHYTOMEDICATIONS IN WOMEN WITH HYPOGALACTIA

Introduction. Rational nutrition means, first of all, feeding infants during the first year of their lives with mother’s breast milk. Among numerous problems of breast feeding the most frequent one is mother’s complaint of not having sufficient amount of milk. The aim of this work was to study special features of clinical course of postnatal period and investigate the effect of "Shirafza” phytomedication on lactation in women in childbirth with a decreased lactational function. Materials and methods. 60 women in childbirth have been examined who were divided into two groups: I main group - 30 women with a decreased lactational function. II - control group - 30 women in childbirth with a preserved lactational function. Lactational function in women was evaluated on the fourth-fifth day of postnatal period on the basis of clinical examinations of the woman in childbirth, day amount of milk that is produced, food supplements of mixtures to the infant’s feeding and indeces of weight loss and its restoration during first four-five days after birth. Normal lactation was regarded a condition without food supplements, when maximum weight loss was no more than 6%, restoration of initial weight no less than 95% during early neonatal period. Results of the study and discussion. The formation of lactation during first 5 days after labor is influenced by the woman’s somatic health condition, her obstetrical-gynecologist status, obstetrical complications which were registered more frequently in women from the main group that’s why we have suggested recovery of lactational function in this group of patients by means of "Shirafza” phytomedication, stimulates all stages of lactation, prevents problems of overweight in feedings mothers and rise of glucose level in blood. Shirafza effect is conditioned by herbs in its composition. The preparation was taken by women from the main group because they complainted mostly of insufficient milk production. The preparation was-taken from the 4-th day of postnatal period by 1 capsule three times a day. 2 5 women-in labor (83,3%)were marked down to increase the volume of milk on the 5-6th day of the intakes as well as to improve milk quality which manifested inself in the absence of dry "swaddling clothes” syndrome, the baby was actively sucking mother’s breast.Кафедра акушерства та гінекологі

PECULIARITIES OF PREGNANCY, CHILDBIRTH AND THE POSTPARTUM PERIOD IN WOMEN WITH ENDOMETRIOSIS

Endometriosis - a widespread disease in women of reproductive age and perimenopausal. Endometriosis is a chronic progressive disease and recurrent disease, which affects 12 to 60% of women of reproductive age. In women with different forms of endometriosis pregnancy occurs according to the latest research with significant abnormalities. According to other authors, 30 - 40% of patients with endometriosis suffer from infertility. Objective. To evaluate the peculiarities of pregnancy, childbirth and the postpartum period in women with endometriosis. Material and methods. In Chernivtsi city maternity hospital №1 were examined 60 pregnant women of reproductive age from 21 to 42 years (average age was 31,5 ± 3,26 years), the main group included 30 women with clinical signs of endometriosis and in control - 30 women without gynecological and somatic disorders. The study of pregnancy in the examined groups showed that in the study group threatened miscarriage occurred 5,9 times more frequently than among patients in the control group. In assessing obstetric complications was found that 76,7% of women with endometriosis, birth complicated by premature rupture of the amniotic membranes, 15% - fetal distress, 8,3% - primary and secondary weakness of labor activity, 3 women was hypotonic bleeding. According Apgar scale the results were better in the control group. Early and late postnatal complications noted the following: uterine bleeding 5% childbirth main group and 1,2% - childbirth control group, subinvolution of uterus in 8,3% and 3,6% respectively. Lohiometra occurred in 30% of patients with endometriosis and 3,6% of patients in the control group. The hospital asked about lactostasis 13,3% childbirth main group and 7,1% in the control group of women in childbirth. Conclusions. 1. Preterm labor occurred 10,4 times more in women with endometriosis than the control group. 2. Labor by Ceserean section was a third of the patients of the main group. 3. Condition of newborns of women with endometriosis were not significantly different from the condition of infants in the control group.Кафедра акушерства та гінекологі

Spin current injection by intersubband transitions in quantum wells

We show that a pure spin current can be injected in quantum wells by the absorption of linearly polarized infrared radiation, leading to transitions between subbands. The magnitude and the direction of the spin current depend on the Dresselhaus and Rashba spin-orbit coupling constants and light frequency and, therefore, can be manipulated by changing the light frequency and/or applying an external bias across the quantum well. The injected spin current should be observable either as a voltage generated via the anomalous spin-Hall effect, or by spatially resolved pump-probe optical spectroscopy.Comment: minor changes, short version publishe

Magnetoresistance due to edge spin accumulation

Because of spin-orbit interaction, an electrical current is accompanied by a spin current resulting in spin accumulation near the sample edges. Due again to spin-orbit interaction this causes a small decrease of the sample resistance. An applied magnetic field will destroy the edge spin polarization leading to a positive magnetoresistance. This effect provides means to study spin accumulation by electrical measurements. The origin and the general properties of the phenomenological equations describing coupling between charge and spin currents are also discussed.Comment: 4 pages, 3 figures. Minor corrections corresponding to the published versio

Tunneling spin-galvanic effect

It has been shown that tunneling of spin-polarized electrons through a semiconductor barrier is accompanied by generation of an electric current in the plane of the interfaces. The direction of this interface current is determined by the spin orientation of the electrons, in particular the current changes its direction if the spin orientation changes the sign. Microscopic origin of such a 'tunneling spin-galvanic' effect is the spin-orbit coupling-induced dependence of the barrier transparency on the spin orientation and the wavevector of electrons.Comment: 3 pages, 2 figure