HYGIENIC ASSESSMENT OF JOINT ACTION OF DEFICIENCY OF IODINE AND FLUORIC POLLUTION ON THE CONDITION OF THE THYROID GLAND IN CHILDREN

The content of fluorine in atmospheric air, in soil, and in system of centralized household-drinking water supply of city of Bratsk are studied, data of branch of Federal Budgetary Healthcare Institution «The Center of Hygiene and Epidemiology of Irkutsk Region» in Bratsk and region of Bratsk, data of Bratsk branch of state institution «Irkutsk CGMS - P» are used. The assessment of prevalence of iodine deficiency of children in two ecologically various districts of city of Bratsk is given. Results of obtained data are turned into practical recommendations on prevention of iodine deficiency in conditions of industrial influence of fluorine. In chosen areas examination of children of preschool age is provided. The number of surveyed made 98 persons including 49 girls and 49 boys. Iodine and fluorine excretion with urine, and also content of fluorine in teeth were defined. Iodine in urine was determined with a spectrophotocolorimetry method. The content of fluorine in urine was determined by an electrometric method with the use of fluoride selective electrode complete with pH in meter according to TORMENTS 4.1.773 - 99. Approved, certified methods of definition of fluorine in teeth do not exist in Russian Federation. Fluorine definition in teeth is based on reaction with alizarin complexon and cerium nitrate with formation of the painted connection. Now it is the only reaction used for direct photometric definition of fluorine. We came to conclusion that contents of fluorine in such biosubstrates as urine and teeth in children of the Central district, though doesn>t exceed admissible level, is significantly above the one of children living in settlement Energetic. This results from the fact that atmospheric air in the Central district is more polluted by fluoric connections. It is known that iodine and fluorine are halogens, and the second one possesses more expressed biological activity and can replace the first in the competitive way. Thus, in this research we tried to prove experimentally that urinary iodine indicators directly depend on industrial influence of fluorine

An Integrated-Photonics Optical-Frequency Synthesizer

Integrated-photonics microchips now enable a range of advanced functionalities for high-coherence applications such as data transmission, highly optimized physical sensors, and harnessing quantum states, but with cost, efficiency, and portability much beyond tabletop experiments. Through high-volume semiconductor processing built around advanced materials there exists an opportunity for integrated devices to impact applications cutting across disciplines of basic science and technology. Here we show how to synthesize the absolute frequency of a lightwave signal, using integrated photonics to implement lasers, system interconnects, and nonlinear frequency comb generation. The laser frequency output of our synthesizer is programmed by a microwave clock across 4 THz near 1550 nm with 1 Hz resolution and traceability to the SI second. This is accomplished with a heterogeneously integrated III/V-Si tunable laser, which is guided by dual dissipative-Kerr-soliton frequency combs fabricated on silicon chips. Through out-of-loop measurements of the phase-coherent, microwave-to-optical link, we verify that the fractional-frequency instability of the integrated photonics synthesizer matches the $7.0*10^{-13}$ reference-clock instability for a 1 second acquisition, and constrain any synthesis error to $7.7*10^{-15}$ while stepping the synthesizer across the telecommunication C band. Any application of an optical frequency source would be enabled by the precision optical synthesis presented here. Building on the ubiquitous capability in the microwave domain, our results demonstrate a first path to synthesis with integrated photonics, leveraging low-cost, low-power, and compact features that will be critical for its widespread use.Comment: 10 pages, 6 figure

Isotropic and anisotropic diffraction of coherent light on periodically poled domain structures in the lithium niobate crystal

Мы сообщаем об экспериментальных исследованиях и численном анализе изотропной и анизотропной брэгговской дифракции когерентного светового пучка (λ = 655 нм), распространяющегося через периодически поляризованную доменную структуру с пространственным периодом Λ = 8,79 мкм, образованную в кристалле MgO:LiNbO3.We report on experimental investigations and numerical analysis of isotropic and anisotropic ragg diffraction for the coherent light eam (λ = 655 nm) propagating through the periodically poled domain structure with the spatial period Λ = 8.79 m formed in a MgO:LiNbO3 crystal by the electric reversal method.Работа выполнена при поддержке Минобрнауки РФ в рамках Госзадания на 2017-2019 г.г. (№. 3.8898.2017/8.9, 3.4993.2017/6.7, 3.4973.2017/7.8), РФФИ (грант № 16-29-14046-ofi_m) и Правительства РФ (акт 211, соглашение 02.A03.21.0006)

PROFESSIONAL STABILITY AS "SOFT SKILLS' OF A TEACHER

The article discusses such a concept as "soft skills". Nowadays this concept is understood as a very important one in a teaching profession. The concept "soft skills" has been actively developed in Western pedagogical science since the beginning of 2000s. There is no single approach to the interpretation of "soft skills" in Russian science. Western and Russian scientists include the following components in "soft skills". They are emotional intelligence, the ability to persuade, the ability find an approach to people, communication and management talents, the ability to resolve conflict situations, readiness for risks, stress. Also, a person must have such qualities as creativity, flexibility, and his wish to search for alternative solutions. Most researchers are considered professional stability as an integrative quality of a person, as a key component of a teacher's professional culture, as stability of emotional reactions, the ability to regulate emotional state, as a factor of successful professional activity in extreme situations. We understand this term as the integrative quality of a person. It ensures the ability of a teacher to carry out professional activities for a long time with a high level of emotional stability and effective work under extreme situations. The research was based on the Vocational and Pedagogical Institute of the South Ural State Humanitarian Pedagogical University. The study involved 120 bachelors, 52 master's degree students and 27 university teachers. The authors of the article conducted an empirical research. Its findings are the following: 1 the majority of respondents are not familiar with the concept "soft skills". Although when meeting them, they consider it important for their future professional activity; 2 the majority of respondents are familiar with the concept "professional stability" and consider it important for their professional activities. Also, the majority of respondents consider the concept "soft skills" important in the teaching profession

Dramatic impact of intermediate-valence impurity on induced magnetism in singlet ground state system PrNi

We studied the influence of La (nonmagnetic) and Ce (intermediate valence) impurities on the ferromagnetic ordering temperature Tc of compounds RE1-x(La,Ce)xNi (RE = Pr, Gd). The ordering temperature Tc was measured in a wide range of impurity concentration. Crystal electric field (CEF) splitting for the PrNi and Pr0.25Ce0.75Ni was defined by neutron spectroscopy measurements. The strong difference in the influence of La and Ce on Tc of PrNi and GdNi based systems has been obtained. The introduction of a spin-fluctuating intermediate valence impurity in PrNi leads to a dramatic increase in the area of the ordered state on the phase diagram, due to an increase in Tc, compared to the impact of La-impurity over the entire concentration range. The dependence of Tc on the Ce concentration for the Pr1-xCexNi was calculated within the framework of the model of microscopic states. The essential modification of the CEF splitting by the Ce impurity appears to be the decisive factor affecting Tc wherein the Ce ion carries zero static magnetic moments similar to the La case. The latter explains the identical dependencies of the ordering temperature on the impurity concentration observed in systems with a long-range order of local magnetic moments Gd1-xLaxNi and Gd1-xCexNi