Stable multiple-charged localized optical vortices in cubic-quintic nonlinear media

The stability of two-dimensional bright vortex solitons in a media with focusing cubic and defocusing quintic nonlinearities is investigated analytically and numerically. It is proved that above some critical beam powers not only one- and two-charged but also multiple-charged stable vortex solitons do exist. A vortex soliton occurs robust with respect to symmetry-breaking modulational instability in the self-defocusing regime provided that its radial profile becomes flattened, so that a self-trapped wave beam gets a pronounced surface. It is demonstrated that the dynamics of a slightly perturbed stable vortex soliton resembles an oscillation of a liquid stream having a surface tension. Using the idea of sustaining effective surface tension for spatial vortex soliton in a media with competing nonlinearities the explanation of a suppression of the modulational instability is proposed.Comment: 4 pages, 3 figures. Submitted to Journal of Optics A. The proceedings of the workshop NATO ARW, Kiev 2003 Singular Optics 200

Міжнародні стандарти гендерної політики в секторі безпеки і оборони України

Стаття присвячена визначенню ролі гендеру в побудові національного сектору безпеки і оборони. Аналізуються основні міжнародні, регіональні та, пов’язані з ними, національні правові акти, що стали основою для впровадження гендерної компоненти в сектор безпеки і оборони України. Забезпечення ґендерної рівності у секторі безпеки і оборони України стало одним із основних пріоритетних напрямів державної політики у сфері євроатлантичної інтеграції відповідно до стандартів та рекомендацій НАТО.The article is devoted to the definition of the role of gender in the formation of the national security and defense sector. The author analyzes the main international, regional and the related national legal acts that create the basis for the implementation of the gender component in the security and defense sector of Ukraine. The key findings of the study prove that legal science needs elaboration of the categorial framework, especially the categories denoting equality of sexes, social equality and human rights. Ensuring gender equality in the national security and defense sector has become one of the main priorities of the Ukrainian state policy in the field of Euro-Atlantic integration, which demands approximation to the NATO standards and recommendations. In modern societies protecting human rights has become the main goal of the whole legal system and the concept of equality is a fundamental principle of the legal science in general. It allows utilization of the appropriate methods and ways of the rights realization and protection. The principle of equality has become the determinant principle of life in a democratic and legal state

Динамика содержания тяжелых металлов в сырье для получения сердечных гликозидов на примере CONVALLARIA MAJALIS L

Для подтверждения нашей гипотезы о связи географии онкологических заболеваний с содержанием на территориях тяжелых металлов, мы начали изучать их содержание в лекарственных растениях, в частности, в CONVALLARIA MAJALIS L

Динамика содержания тяжелых металлов в сырье для получения сердечных гликозидов на примере CONVALLARIA MAJALIS L

Для подтверждения нашей гипотезы о связи географии онкологических заболеваний с содержанием на территориях тяжелых металлов, мы начали изучать их содержание в лекарственных растениях, в частности, в CONVALLARIA MAJALIS L

Stability of two-dimensional spatial solitons in nonlocal nonlinear media

We discuss existence and stability of two-dimensional solitons in media with spatially nonlocal nonlinear response. We show that such systems, which include thermal nonlinearity and dipolar Bose Einstein condensates, may support a variety of stationary localized structures - including rotating spatial solitons. We also demonstrate that the stability of these structures critically depends on the spatial profile of the nonlocal response function.Comment: 8 pages, 9 figure

Solitons in nonlocal nonlinear media: exact results

We investigate the propagation of one-dimensional bright and dark spatial solitons in a nonlocal Kerr-like media, in which the nonlocality is of general form. We find an exact analytical solution to the nonlinear propagation equation in the case of weak nonlocality. We study the properties of these solitons and show their stability.Comment: 9 figures, submitted to Phys. Rev.

Tracking azimuthons in nonlocal nonlinear media

We study the formation of azimuthons, i.e., rotating spatial solitons, in media with nonlocal focusing nonlinearity. We show that whole families of these solutions can be found by considering internal modes of classical non-rotating stationary solutions, namely vortex solitons. This offers an exhaustive method to identify azimuthons in a given nonlocal medium. We demonstrate formation of azimuthons of different vorticities and explain their properties by considering the strongly nonlocal limit of accessible solitons.Comment: 11 pages, 7 figure