Diagrammatic calculation of energy spectrum of quantum impurity in degenerate Bose-Einstein condensate

In this paper we considered a quantum particle moving through delute Bose-Einstein condensate at zero temperature. In our formulation the impurity particle interacts with the gas of uncoupled Bogoliubov's excitations. We constructed the perturbation theory for the Green's function of the impurity particle with respect to the impurity-condensate interaction employing the coherent-state path integral approach. The perturbative expansion for the Green's function is resumed into the expansion for its poles with the help of the diagrammatic technique developed in this work. The dispersion relation for the impurity clothed by condensate excitations is obtained and effective mass is evaluated beyond the Golden rule approximation

Relation between Communicative Tolerance and Intercultural Adaptation in International Students

The paper presents the results of a study of the connection between the parameters of the communicative tolerance and the intercultural adaptation in the international students from a multinational university (Peoples’ Friendship University of Russia). A total of 337 respondents took part in the research, including 182 young men and 155 young women from five parts of the world: Latin America, Asia (China), Arab countries, Africa, the countries of the Central Asian region. The level of the communicative tolerance was measured with the technique “General communicative tolerance” by V.V.Boyko. The Questionnaire of the adaptation of the person to the new socio-cultural environment (APSCE) by L.V.Yankovsky, in T.G.Stefanenko and M.S.Panov’s modified version was used to define the features of the intercultural adaptation of the international students. The Kruskal–Wallis non-parametrical criteria, the Analysis of Variance (MANOVA), and the correlation analysis (Spearman Rank Correlations) were used for the statistical analysis. The study revealed that the rates of the communicative tolerance, as a whole, are positively related to the efficiency of the intercultural adaptation of the international students in Russia (especially for the students from Africa, Arab countries and Latin America). DOI: 10.5901/mjss.2015.v6n2s2p10

The effect of agro-reclamation techniques on water-physical characteristics of light chestnut heavy loamy soil during rice cultivation against the background of sprinkling under the conditions of the Lower Volga region

Purpose: scientific substantiation of the use of agro-reclamation tillage practices of light chestnut heavy loamy soils in rice cultivation with periodic irrigation by sprinkling. Materials and methods. The research was conducted at the experimental site of the All-Russian Research Institute of Irrigated Agriculture in 2022–2023 with Stalingrad 1 rice crops in a two-factor experiment: factor A (soil water regime) – two options and factor B (tillage) – three options. Generally accepted methods of laying and conducting field research were used. Results. Immediately after rice sowing, the soil density in the layer of 0.0–0.6 m, varied in the range of 1.19–1.41 t/cubic m depending on the tillage practice. The minimum value of soil density in the layer of 0.0–0.6 m was formed in the A2B3 variant and amounted to 1.23 t/cubic m. The maximum soil compaction in this layer of 1.34 t/cubic m was observed in variant A1B1. During the period of full ripeness of the grain, soil compaction occurred in all tillage options. Its minimum compaction (1.34 t/cubic m), compared with the control (winter plowing), was noted with a combination of winter plowing and spring deep loosening. The minimum values of the water consumption coefficient and irrigation water loss were obtained in the A2B3 variant, and their numerical values were 851.7 and 703.6 cubic m/t, respectively. Conclusions. It was found that winter plowing to a depth of 0.25–0.27 m in combination with spring deep loosening to a depth of 0.40 m, in comparison with traditional winter plowing in one step, provides a decrease in soil density in a layer of 0.0–0.4 m by 0.10 (after sowing) and 0.12 t/cubic m (during the period of full ripeness of grain), which contributes to the yield increase to 6.95 t/ha and a reduction in irrigation water loss by 112.4 cubic m for the formation of 1 ton of grain

Raise the anchor! Synthesis, X-ray and NMR characterization of 1,3,5-triazinanes with an axial tert-butyl group

N-t-Bu-N’,N’’-disulfonamide-1,3,5-triazinanes were synthesized and characterized by X-ray single crystal structure analysis. In the course of the X-ray structure elucidation, the first solid experimental evidence of the axial position of the tert-butyl group in unconstrained hexahydro-1,3,5-triazacyclohexanes was obtained. Dynamic low-temperature NMR analysis allowed to fully investigate a rare case of crystallization-driven unanchoring of the tert-butyl group in the chair conformation of saturated sixmembered cycles. DFT calculations show that the use of explicit solvent molecules is necessary to explain the equatorial position of the t-Bu group in solution. Otherwise, the axial conformer is the thermodynamically stable isomer.Fil: Kletskov, Alexey V.. University of Russia; RusiaFil: Zatykina, Anastasya D.. University of Russia; RusiaFil: Grudova, Mariya V.. University of Russia; RusiaFil: Sinelshchikova, Anna A.. Academy of Sciences; RusiaFil: Grigoriev, Mikhail. Academy of Sciences; RusiaFil: Zaytsev, Vladimir P.. University of Russia; RusiaFil: Gil, Diego Mauricio. Universidad Nacional de Tucumán. Instituto de Biotecnología Farmacéutica y Alimentaria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Biotecnología Farmacéutica y Alimentaria; Argentina. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Química Orgánica; ArgentinaFil: Novikov, Roman A.. Academy of Sciences; RusiaFil: Zubkov, Fedor Ivanovich. University of Russia; RusiaFil: Frontera, Antonio. Universidad de las Islas Baleares; Españ

Development of Human Resources of Agro-Industrial Complex

The article investigates the distinctive features of the development of human resources of agro-industrial complex (AIC). The study determined the categorical nature of human resources, as a whole, and the author's vision of the resource capacity of AIC was offered, in particular. The detailed analysis of the development of human resources of AIC in Ukraine, Kazakhstan, Russia and Belarus through the prism of the study of the features of life, well-being and safety of the rural population was carried out. Particular attention is paid to the problems of staffing of AIC of the leading countries of the world, including EU countries. The results obtained allowed to establish the fact of the indirect identity of the main factors of reduction of the rural population in the considered post-Soviet republics and the depopulation of rural areas in the EU. On this basis, at the conceptual level the key tasks were identified, which resolution, as for Russia, Kazakhstan, Ukraine and Belarus, and for Europe, make prospects of development of human resources of AIC. Taking into consideration peculiarities of AIC of Russia, as well as specific, national problems of rural development, the article developed the concept of development of human resources of AIC of Russia. Apart, within the concept, measures for training and retraining of workers for agricultural enterprises of Russia were allocated, as well as a model of balancing supply and demand in the labor market in order to determine the number of specialists of specific specialties necessary for the development of AIC in the region was offered.Досліджено особливості розвитку людських ресурсів АПК. Дослідження визначило категоріальний характер людських ресурсів у цілому, а також авторське бачення ресурсного потенціалу АПК, зокрема. Проведено детальний аналіз розвитку людських ресурсів АПК України, Казахстану, Росії та Білорусі через призму вивчення особливостей життя, добробуту та безпеки сільського населення. Особлива увага приділяється проблемам кадрового забезпечення АПК провідних країн світу, включаючи країни ЄС. Отримані результати дозволили встановити факт непрямої ідентичності основних чинників скорочення сільського населення в розглянутих пострадянських республіках і депопуляції сільських територій в ЄС. Виходячи з цього, на концептуальному рівні були визначені ключові завдання, вирішення яких, як для Росії, Казахстану, України та Білорусі, так і для Європи, дають перспективи розвитку людських ресурсів АПК. Враховуючи особливості АПК Росії, а також специфічні національні проблеми розвитку села, розроблено концепцію розвитку людських ресурсів АПК Росії. Крім того, в рамках концепції виділено заходи щодо підготовки та перепідготовки працівників сільськогосподарських підприємств Росії, а також модель балансування попиту та пропозиції на ринку праці з метою визначення кількості фахівців конкретних спеціальностей, необхідних для розвитку. АПК у регіоні.В статье исследуются отличительные особенности развития человеческих ресурсов агропромышленного комплекса (АПК). В ходе исследования была определена категориальная природа человеческих ресурсов в целом, и, в частности, было предложено авторское видение ресурсного потенциала АПК. Был проведен детальный анализ развития человеческих ресурсов АПК в Украине, Казахстане, России и Белоруссии через призму изучения особенностей жизни, благополучия и безопасности сельского населения. Особое внимание уделено проблемам кадрового обеспечения АПК ведущих стран мира, в том числе стран ЕС. Полученные результаты позволили установить факт косвенной идентичности основных факторов сокращения сельского населения в рассматриваемых постсоветских республиках и депопуляции сельских территорий в ЕС. Исходя из этого, на концептуальном уровне были определены ключевые задачи, решение которых, как для России, Казахстана, Украины и Беларуси, так и для Европы, определяет перспективы развития человеческих ресурсов АПК. Принимая во внимание особенности АПК России, а также специфические национальные проблемы развития села, в статье разработана концепция развития человеческих ресурсов АПК России. Кроме того, в рамках концепции были выделены меры по подготовке и переподготовке работников сельскохозяйственных предприятий России, а также модель балансирования спроса и предложения на рынке труда с целью определения количества специалистов конкретных специальностей, необходимых для развития. АПК в регионе было предложено

Invariant variational principle for Hamiltonian mechanics

It is shown that the action for Hamiltonian equations of motion can be brought into invariant symplectic form. In other words, it can be formulated directly in terms of the symplectic structure $\omega$ without any need to choose some 1-form $\gamma$, such that $\omega= d \gamma$, which is not unique and does not even generally exist in a global sense.Comment: final version; to appear in J.Phys.A; 17 pages, 2 figure