Stability of multi-hump optical solitons

We demonstrate that, in contrast with what was previously believed, multi-hump solitary waves can be stable. By means of linear stability analysis and numerical simulations, we investigate the stability of two- and three-hump solitary waves governed by incoherent beam interaction in a saturable medium, providing a theoretical background for the experimental results reported by M. Mitchell, M. Segev, and D. Christodoulides [Phys. Rev. Lett. v. 80, p. 4657 (1998)].Comment: 4 pages, 5 figures, to appear in PR

Pneumatic transportation of dispersed medium through a vertical tube immersed into a fluidized bed

We discuss the technical problem of how to transport granular material in a vertical direction from the underlying section of a multistage apparatus containing a fluidized bed to an upper section through tubes immersed into the fluidized bed without additional expenditures of energy. The intensity with which the dispersed medium (a mixture of gas and fuel particles) moves through the tube and the mass flowrate of particles are determined by the ratio between the hydraulic resistances of dispersed medium inside the tube and of the fluidized bed outside of it. In turn, this ratio depends on the fluidization number W (W = w s/w 0, where w s is the seepage velocity and w 0 is the fluidization commencement velocity) and on the tube immersing depth into the bed. © 2013 Pleiades Publishing, Inc

Dark-Bright Solitons in Inhomogeneous Bose-Einstein Condensates

We investigate dark-bright vector solitary wave solutions to the coupled non-linear Schr\"odinger equations which describe an inhomogeneous two-species Bose-Einstein condensate. While these structures are well known in non-linear fiber optics, we show that spatial inhomogeneity strongly affects their motion, stability, and interaction, and that current technology suffices for their creation and control in ultracold trapped gases. The effects of controllably different interparticle scattering lengths, and stability against three-dimensional deformations, are also examined.Comment: 5 pages, 5 figure

Walking vector soliton caging and releasing

We address the formation and propagation of vector solitons in optical lattices in the presence of anisotropy-induced walk-off between ordinary and extraordinary polarized field components. Stable vector solitons trapped by the lattice form above a threshold power, while decreasing the lattice depth below a critical value results in the abrupt release of the caged solitons, that then move across the lattice and may get trapped in a desired lattice channel.Comment: 13 pages, 4 figures, to appear in Optics Letter

Структурированное наблюдение как метод изучения религиозного ландшафта

Представлены результаты исследования, нацеленного на создание социологического маршрутизатора по православному ландшафту Екатеринбурга. Для профессионального читателя интерес представит инновационная методология изучения организационно-религиозного взаимодействия в его контекстуальной и культурной уникальности. Сердцевину методологии составила комбинация стратегии thick description в версии Н. Дензина и структурированного наблюдения в авторской операционализации. Предлагаемое рассмотрение результатов сплошного наблюдения (thick description) православного интерактивного ландшафта Екатеринбурга изначально задумывалось как пилотажная часть большого исследовательского проекта. Однако по мере подготовки к его проведению и собственно осуществлению замысла стало очевидно, что научных экспликаций подобного рода thick description как предварительного этапа опросов или экспертных интервью пока еще нигде не проводилось. Провокативность текста состоит также и в том, что авторы детально разъясняют методологию построения и операционализации структурных единиц наблюдения применительно к конкретному объекту. Благодаря введению в научный оборот авторской методологии структурированного наблюдения подобное исследование может быть проведено в любом другом городе и стране. Получившийся социологический маршрутизатор по православному ландшафту Екатеринбурга — это приглашение к научному путешествию в направлении построения обоснованных и репрезентативных выборок для узкотематизированных проектов

Structured observation as a method of religious landscape studies

The article presents the results of a study devoted to the Orthodox landscape in Yekaterinburg. A professional reader might be interested in the authors’ innovative methodology to study religious interaction in its contextual and cultural uniqueness. The key element of the methodology is a combination of the ‘thick description’ strategy proposed by Norman K. Denzin and a structured observation in the author’s operationalization. Initially, the proposed consideration of the results of the Yekaterinburg interactive landscape’s ‘thick description’ was intended to be a pilot study of a big research project. However during the implementation phase the authors revealed that the method of ‘thick description’ had never been used as a preliminary stage of survey or exert interview. The provocative character of the paper is that the authors explain in detail the methodology of design and operationalization of the structured items of the observation with regard to a specific object. Structured observation introduced by the authors as a scientific method helps to conduct a similar study in any other city or country. The obtained sociological ‘router’ of Yekaterinburg’s Orhodox landscape is an invitation to a scientific journey towards the design of representative samples for narrow-focused projects. © 2018 Russian Public Opinion Research Center VCIOM. All Rights Reserved.Российский Фонд Фундаментальных Исследований (РФФИ): 16-03-00-387Keywords: structured observation, structural items of observation, religious interaction, confession, thick description, Orthodox landscape of Yekaterinburg Acknowledgment. The study was funded by RFBR (research project no. 16-03-00-387)

Dipole-Mode Vector Solitons

We find a new type of optical vector soliton that originates from trapping of a dipole mode by a soliton-induced waveguide. These solitons, which appear as a consequence of the vector nature of the two component system, are more stable than the previously found optical vortex-mode solitons and represent a new type of extremely robust nonlinear vector structure.Comment: Four pages with five eps figure

Observation of dipole-mode vector solitons

We report on the first experimental observation of a novel type of optical vector soliton, a {\em dipole-mode soliton}, recently predicted theoretically. We show that these vector solitons can be generated in a photorefractive medium employing two different processes: a phase imprinting, and a symmetry-breaking instability of a vortex-mode vector soliton. The experimental results display remarkable agreement with the theory, and confirm the robust nature of these radially asymmetric two-component solitary waves.Comment: 4 pages, 8 figures; pictures in the PRL version are better qualit

Vortices in atomic-molecular Bose-Einstein condensates

The structure and stability of vortices in hybrid atomic-molecular Bose-Einstein condensates is analyzed in the framework of a two-component Gross-Pitaevskii-type model that describes the stimulated Raman-induced photoassociation process. New types of topological vortex states are predicted to exist in the coherently coupled two-component condensates even without a trap, and their nontrivial dynamics in the presence of losses is demonstrated.Comment: 7 pages, 6 figure