Observation of polarization quantum noise of laser radiation in Rb vapor cell

We present experimental study of polarization quantum noise of laser radiation passed through optically think vapor of Rb87. We observe a step-like noise spectrum. We discuss various factor which may result in such noise spectrum and prevent observation of squeezing of quantum fluctuations predicted in Matsko et al. PRA 63, 043814 (2001).Comment: 4 pages, 5 figures. Translated from Russian by I. Novikov

Enhancement of Kerr nonlinearity via multi-photon coherence

We propose a new method of resonant enhancement of optical Kerr nonlinearity using multi-level atomic coherence. The enhancement is accompanied by suppression of the other linear and nonlinear susceptibility terms of the medium. We show that the effect results in a modification of the nonlinear Faraday rotation of light propagating in an Rb87 vapor cell by changing the ellipticity of the light.Comment: 4 pages, 3 figures Submitted to Optics Letter

Radiation trapping in coherent media

We show that the effective decay rate of Zeeman coherence, generated in a Rb87 vapor by linearly polarized laser light, increases significantly with the atomic density. We explain this phenomenon as the result of radiation trapping. Our study shows that radiation trapping must be taken into account to fully understand many electromagnetically induced transparency experiments with optically thick media

Large negative and positive delay of optical pulses in coherently prepared dense Rb vapor with buffer gas

We experimentally study the group time delay for a light pulse propagating through hot Rb vapor in the presence of a strong coupling field in a $\Lambda$ configuration. We demonstrate that the ultra-slow pulse propagation is transformed into superluminal propagation as the one-photon detuning of the light increases due to the change in the transmission resonance lineshape. Negative group velocity as low as -c/10^6=-80 m/s is recorded. We also find that the advance time in the regime of the superluminal propagation grows linearly with increasing laser field power.Comment: 5 pages, 6 figure

Treatment of adolescent girls with abnormal uterine bleeding taking into account psychoemotional and vegetative status

Tuchkina I. A., Tuchkina M. Yu., Novikova A. A. Treatment of adolescent girls with abnormal uterine bleeding taking into account psychoemotional and vegetative status. Journal of Education, Health and Sport. 2019;9(5):575-582. eISNN 2391-8306. DOI http://dx.doi.org/10.5281/zenodo.3239459 http://ojs.ukw.edu.pl/index.php/johs/article/view/7001 The journal has had 7 points in Ministry of Science and Higher Education parametric evaluation. Part B item 1223 (26/01/2017). 1223 Journal of Education, Health and Sport eISSN 2391-8306 7 © The Authors 2019; This article is published with open access at Licensee Open Journal Systems of Kazimierz Wielki University in Bydgoszcz, Poland Open Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author (s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non commercial license Share alike. (http://creativecommons.org/licenses/by-nc-sa/4.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited. The authors declare that there is no conflict of interests regarding the publication of this paper. Received: 29.04.2019. Revised: 15.05.2019. Accepted: 31.05.2019. TREATMENT OF ADOLESCENT GIRLS WITH ABNORMAL UTERINE BLEEDING TAKING INTO ACCOUNT PSYCHOEMOTIONAL AND VEGETATIVE STATUS I. A. Tuchkina, M. Yu. Tuchkina, A. A. Novikova Kharkiv National Medical University Department of Obstetrics, Gynecology and Pediatric Gynecology Abstract The study, which was conducted at the clinical bases of the Department of Obstetrics, Gynecology and Pediatric Gynecology of the Kharkov National Medical University for 2 years, included 98 adolescent girls with abnormal uterine bleeding during puberty (AUBDP) 11-18 years old. A comprehensive clinical and laboratory examination included an analysis of complaints and the clinical course of the disease, a study of early history with an assessment of the infectious index, the course of pregnancy and labor in mothers, the degree of physical and sexual development, the characteristic of menstrual function, gynecological status, ovarian function. Also were studied urine and bacteriological seeding from the vagina, coagulogram, hormonal profile and ultrasound. The psychoemotional state of adolescents was studied using techniques adapted to their age. When treating 30 adolescent girls with AUBDP (I group), we used conservative therapy. Hormonal treatment was carried out according to strict indications of 18 adolescent girls with AUBDP (group II), with the ineffectiveness of symptomatic therapy. 50 patients with AUBDP (group III) received therapy, including medicines that contains indole-3-carbinol tranexamic acid and received physiotherapy. The established causes of bleeding, identified during the history taking, were stressful situations - 36.7%, increased physical and mental stress - 15.3%, acute and chronic respiratory and viral diseases - 12.2%. Differential use of the developed complexes of adequate therapy, taking into account the level of anxiety of patients with AUBDP, according to the indications was effective in most patients. The inclusion of physiotherapeutic treatment in therapeutic regimens helped to reduce the medicine load on the developing organism of adolescent girls. In most patients, there was an improvement in the characteristics of psychoemotional status; positive dynamics of the progress of the puberty period, normalization of menstrual function were observed. From this point of view, the active use of modern clinical diagnostic and new medical complexes using effective treatment schemes for correcting pathological conditions in adolescence is promising. Key words: abnormal uterine bleeding, adolescent girls, stress, physiotherapy

Dynamic optical bistability in resonantly enhanced Raman generation

We report observations of novel dynamic behavior in resonantly-enhanced stimulated Raman scattering in Rb vapor. In particular, we demonstrate a dynamic hysteresis of the Raman scattered optical field in response to changes of the drive laser field intensity and/or frequency. This effect may be described as a dynamic form of optical bistability resulting from the formation and decay of atomic coherence. We have applied this phenomenon to the realization of an all-optical switch.Comment: 4 pages, 5 figure

X-ray-absorption fine-structure study of ZnSexTe1−x alloys

X-ray-absorption fine-structure experiments at different temperatures in ZnSexTe1−x (x=0, 0.1, 0.2, 0.55, 0.81, 0.93, 0.99, and 1.0) have been performed in order to obtain information about the structural relaxation and disorder effects occurring in the alloys. First and second neighbor distance distributions have been characterized at the Se and Zn K edges, using multiple-edge and multiple-scattering data analysis. The first neighbor distance distribution was found to be bimodal. The static disorder associated with the Zn–Te distance variance did not depend appreciably on composition. On the other hand, the static disorder associated with the Zn–Se distance increased as the Se content diminished. Using the bonding angle information provided by our experiments the point of view of the anion has been related to that of the cation. The resulting structural model indicates that Zn tetrahedra surrounding the anions remain essentially undistorted, but forced to tilt from their ideal zincblende orientation to accommodate the minority element. The main origin of structural disorder is [email protected] ; [email protected]

Salinization dynamics in irrigated soils of the Svetloyarsk irrigation system, Volgograd oblast

On the basis of soil surveys performed by the Volgograd hydrogeological reclamation expedition in 1998 and 2006, published data, and original materials obtained by the authors, the dynamics of soil salinization within the Svetloyarsk irrigation system in Volgograd oblast during the irrigation and post-irrigation periods have been traced. It is found that high irrigation rates under conditions of poor drainage and closed drainage basins upon both shallow (within the Caspian Lowland) and relatively deep (on the Ergeni Upland) occurrence of saline groundwater and the presence of natural salts in the soils and subsoils lead to the rise in the groundwater level above the critical level and the development of secondary salinization in the previously surfacesaline, deeply saline, and even nonsaline soils. During the post-irrigation period (15-18 years) under modern climatic conditions, the groundwater level has been descending to a depth of more than 3 m, and the degree of salinity in the upper meter of light chestnut and meadow-chestnut soils has decreased owing to the leaching of salts with atmospheric precipitation