Generalized polarizabilities of the pion in chiral perturbation theory

We present a calculation of the virtual Compton scattering amplitude for at ${\cal O}(p^4)$. We explicitly derive expressions for generalized electromagnetic polarizabilities and discuss alternative definitions of these quantities

Differential approximation for Kelvin-wave turbulence

I present a nonlinear differential equation model (DAM) for the spectrum of Kelvin waves on a thin vortex filament. This model preserves the original scaling of the six-wave kinetic equation, its direct and inverse cascade solutions, as well as the thermodynamic equilibrium spectra. Further, I extend DAM to include the effect of sound radiation by Kelvin waves. I show that, because of the phonon radiation, the turbulence spectrum ends at a maximum frequency $\omega^* \sim (\epsilon^3 c_s^{20} / \kappa^{16})^{1/13}$ where $\epsilon$ is the total energy injection rate, $c_s$ is the speed of sound and $\kappa$ is the quantum of circulation.Comment: Prepared of publication in JETP Letter

Optical Fibers Based on Modified Silver Halide Crystals for Nuclear Power

We investigated the possibility of the deployment of AgBr – TlBr0.46I0.54MIR fibers in high ionizing radiation environment. For this purpose, we exposed plate samples made of AgBr – TlBr0.46I0.54crystals to β-ionizing radiation at a dose of 100 kGy. We revealed the radiation-induced translucence effect for these materials and assumed its nature. As the investigation showed the suitability of the fibers for the application in high ionizing radiation environment, the authors propose to use these fibers jointly with FTIR spectrometers for the online monitoring of various chemical processes at the nuclear power plants. Keywords: modified silver halides, MIR fibers, FTIR spectroscopy, ionizing radiation resistanc

Polyelectrolyte multilayer formation: electrostatics and short-range interactions

We investigate the phenomenon of multilayer formation via layer-by-layer deposition of alternating charge polyelectrolytes. Using mean-field theory, we find that a strong short-range attraction between the two types of polymer chains is essential for the formation of multilayers. The dependence of the required short-range attraction on the polymer charge fraction and salt concentration is calculated. For weak short-range attraction between any two adjacent layers, the adsorbed amount (per added layer) decays as the distance from the surface increases, until the chains stop adsorbing altogether. For strong short-range attraction, the adsorbed amount per layer increases after an initial decrease, and finally it stabilizes in the form of a polyelectrolyte multilayer that can be repeated many times.Comment: 8 pages, 7 figure

Bunyavirales Order

In 2017 the International Committee on Taxonomy of Viruses (ICTY) established and approved a new order Bunyavirales that unite evolutionary related viruses whose genome is represented by a segmented linear single-stranded RNA of negative or ambisense polarity. Currently, the order Bunyavirales includes 10 families that infect vertebrate animals, invertebrates (arthropods), and plants. At least 41 zoonotic bunyaviruses, including pathogenic for human, were isolated on the territory of Northern Eurasia. This review presents the data on the composition of the families belonging to the order Bunyavirales and a list of zoonotic bunyaviruses, isolated in Northern Eurasia, indicating their modern taxonomy. Most of them are arboviruses, associated with different species of mosquitoes or ticks

Biexciton oscillator strength

Our goal is to provide a physical understanding of the elementary coupling between photon and biexciton and to derive the physical characteristics of the biexciton oscillator strength, following the procedure we used for trion. Instead of the more standard two-photon absorption, this work concentrates on molecular biexciton created by photon absorption in an exciton gas. We first determine the appropriate set of coordinates in real and momentum spaces to describe one biexciton as two interacting excitons. We then turn to second quantization and introduce the "Fourier transform in the exciton sense" of the biexciton wave function which is the relevant quantity for oscillator strength. We find that, like for trion, the oscillator strength for the formation of one biexciton out of one photon plus a \emph{single} exciton is extremely small: it is one biexciton volume divided by one sample volume smaller than the exciton oscillator strength. However, due to their quantum nature, trion and biexciton have absorption lines which behave quite differently. Electrons and trions are fermionic particles impossible to pile up all at the same energy. This would make the weak trion line spread with electron density, the peak structure only coming from singular many-body effects. By contrast, the bosonic nature of exciton and biexciton makes the biexciton peak mainly rise with exciton density, this rise being simply linear if we forget many-body effects between the photocreated exciton and the excitons present in the sample

Modeling Kelvin wave cascades in superfluid helium

We study two different types of simplified models for Kelvin wave turbulence on quantized vortex lines in superfluids near zero temperature. Our first model is obtained from a truncated expansion of the Local Induction Approximation (Truncated-LIA) and it is shown to possess the same scalings and the essential behaviour as the full Biot-Savart model, being much simpler than the later and, therefore, more amenable to theoretical and numerical investigations. The Truncated-LIA model supports six-wave interactions and dual cascades, which are clearly demonstrated via the direct numerical simulation of this model in the present paper. In particular, our simulations confirm presence of the weak turbulence regime and the theoretically predicted spectra for the direct energy cascade and the inverse wave action cascade. The second type of model we study, the Differential Approximation Model (DAM), takes a further drastic simplification by assuming locality of interactions in k-space via using a differential closure that preserves the main scalings of the Kelvin wave dynamics. DAMs are even more amenable to study and they form a useful tool by providing simple analytical solutions in the cases when extra physical effects are present, e.g. forcing by reconnections, friction dissipation and phonon radiation. We study these models numerically and test their theoretical predictions, in particular the formation of the stationary spectra, and closeness of numerics for the higher-order DAM to the analytical predictions for the lower-order DAM

Онлайн-образование как способ гармонизации архетипов самости, корпоративности и ­иерархии

The article considers the mutual influence of the archetypes of Self, corporativity, and hierarchy on the educational process in the online environment.The increase of hierarchical trends in the social institution of education as a result of the emergence of national states and the reforms launched by them, is noted on the example of the Austro-Hungarian Empire. The influence of abstractive impersonality, inherent for a hierarchy, on the manifestations of corporativity is analyzed. Indications are given on the influence of the corporativity, hierarchy, and Self archetypes on the process of emergence of collective identity, in close connection with differentiation and specialization within the group. The role of archetypes in the implementation of the reproduction function imposed by society on educational institutions is noted. The article expresses the idea of the Self archetype»s role in removing contradictions between the archetypes of corporativity and hierarchy. It also lists the problems caused by strengthening the hierarchy archetype in education. The author analyzes the distinctive features of the online form of education in comparison with the usual offline format in the development of the hierarchical, corporate and individual phenomena. The multidirectional possibilities of the electronic format are shown, which can be used both to reinforce and to weaken the tendencies of the archetypes of Self, corporativity, and hierarchy. It is pointed out that there is a contradiction between the innovative form of e-education and the conservatism of the collective unconscious. It is also noted that unconscious schemes of archetypes can be supplemented at the conscious level of culture by filling them with variable symbols and images. Some examples of educational projects on the Internet are given. It is concluded that the rebalancing of the influence of archetypes in favor of Self and corporativity is revealed primarily in online projects that are not controlled by traditional hierarchical organizationsl.В статье рассмотрено взаимовлияние архетипов Самости, корпоративности и иерархии на образовательный процесс в онлайн-среде. Отмечено усиление иерархических тенденций в социальном институте образования в результате появления национальных государств и запущенных ими реформ на примере Австро-Венгерской империи. Проанализировано влияние присущей архетипу иерархии абстрагирующей безличности на проявления архетипа корпоративности. Даны указания на влияние архетипов корпоративности, иерархии и Самости на процесс возникновения коллективной идентичности в тесной связи с дифференциацией и специализацией внутри группы. Отмечена роль архетипов в реализации функции воспроизводства, налагаемой обществом на образовательные институты. Высказана идея о роли архетипа Самости в снятии противоречий меду архетипами корпоративности и иерархии. Перечислены проблемы, вызванные усилением архетипа иерархии в образовании. Проанализированы отличительные черты онлайн формы образования по сравнению с привычным офлайн форматом в развитии иерархических, корпоративных, а также индивидуационных феноменов. Показаны разнонаправленные возможности электронных форматов, которые могут быть использованы как для подкрепления, так и для ослабления тенденций архетипов Самости, корпоративности и иерархии. Указано на противоречие между инновационной формой электронного образования и консерватизмом коллективного бессознательного. Отмечена принципиальная дополняемость бессознательных схем архетипов на сознательном уровне разработки культурой их наполнения вариативными символами и образами. Приведены некоторые примеры образовательных и просветительских проектов в сети Интернет. Делается вывод, что ребалансировка влияния архетипов в пользу Самости и корпоративности открывается прежде всего в онлайн-проектах, не находящихся под управлением традиционных иерархических организаций