Experimental production of long-lived luminous organic polymeric objects

Experiments on creating a plasma jet from capillaries made of polymeric materials, such as wax, ground wood, and rosin, as well as of their mixtures, are described. The plasma jet is used to ignite the wax vapor. The burning wax vapor forms ellipsoidal objects up to 10–15 cm in size, which lift. The time of their burning may reach 0.4 s. Long-lived (about 1.5 s) luminous objects (LLOs) with an apparent size of 1.5 cm are also produced in the experiments. As follows from scanning electron microscopy data, LLO residues consist of polymer fibers. The experiments allow one to suggest that some natural ball lightnings are of organic nature.     

Search for correlations between the solar-flare disturbances of the earth’s magnetosphere and a flux of cosmic rays detected by the RUSALKA setup

The statistical approach has been applied to the search for correlations between the geomagnetic index K _p and the amplitude of daily variations in the station count rate. The upper limit of variations in the rate due to solar activity was ascertained; it is 1.2% (CL = 99%) for K _p = 8.     

Angular distribution of acoustic radiation created in water by a beam of accelerated protons

We present the results of experimental investigations into the hydroacoustic field of a source created by a beam of protons accelerated to an energy of 200 MeV. We obtain the angular distribution of the signal amplitude arising in the most intensively radiating area of the source, localized at the end of an ionized path of protons. We simulate the physical processes accompanying the passage of electrons in a water medium. The results of simulation calculations agree with the experimental data.     

Non-self-maintained gas discharge for flammable gases impact

Investigations on creation of a non-selfmaintained discharge based on electron beam from the electron accelerator EOL-400M for impact on propane-air mixture have been made. Experiments on detection of some plasma and gas parameters have been realized. Works on modeling of electron-molecule processes in propane-air mixture in external electric field and E-beam at different values of stoichiometricity have been realized.     

Dry reforming of methane on porous membrane catalytic systems

A method of high-performance dry reforming of methane into syngas at temperatures below 650 °C on membrane catalytic systems was proposed. The membrane catalytic systems consist of porous inorganic membrane-supports, prepared by self-propagating high-temperature synthesis and modified by nanosized metallocomplex components, which are uniformly distributed inside membrane pores. The influence of the composition of the supported active components, temperature, and flow rate on the activity and selectivity of CH₄ and CO₂ transformations into syngas, as well as the dynamics of CH₄ and CO₂ conversion on the membrane catalytic systems were studied.     

Finite groups with two noncomplemented subgroups

Mathematical Notes - The finite groups containing exactly two noncomplemented subgroups are described.     

The N=4 super Landau models

We briefly describe a new superextended Landau model with a worldline N=4 supersymmetry and an internal target space ISU (2|2) supersymmetry. It shares many features with the previously studied N=2 supersymmetric Landau model, which is also briefly described.     

Evolution of the commensurate and incommensurate magnetic phases of the S = 3/2 kagome staircase Co?V?O? in an applied field

Single crystal neutron diffraction studies have been performed on the S = 3/2 kagome staircase compound Co(3)V(2)O(8) with a magnetic field applied along the magnetization easy-axis ([Formula: see text]). Previous zero-field measurements (Chen Y et al 2006 Phys. Rev. B 74 014430) reported a rich variety of magnetic phases, with a ferromagnetic ground state as well as incommensurate, transversely polarized spin density wave (SDW) phases (with a propagation vector of [Formula: see text]) interspersed with multiple commensurate lock-in transitions. The magnetic phase diagram with [Formula: see text] adds further complexity. For small applied fields, μ(0)H ≈ 0.05 T, the commensurate lock-in phases are destabilized in favor of the incommensurate SDW ones, while slightly larger applied fields restore the commensurate lock-in phase with δ = 1/2 and yield a new commensurate phase with δ = 2/5. For measurements in an applied field, higher-order scattering is observed that corresponds to the second harmonic.     

CsCl effect on the optical properties of the 80GeS2–20Ga2S3 base glass

Optical properties of chalcogenide glasses belonging to the series (80GeS₂–20Ga₂S₃)_100−x (CsCl) _x with x=0;5;10;15;20 were investigated. The linear refractive indices (n ₀) were determined by prism measurements at four wavelengths: 633 nm, 825 nm, 1311 nm, and 1511 nm. Z-scan experiments were performed at 800 nm to measure the non-linear indices (n ₂) and the absorption coefficients (β). CsCl additions in the base glass (80GeS₂–20Ga₂S₃) are characterized by a white shift of the transmission in the visible range and a strong decrease of both n ₀ and n ₂. As the same time, β is also decreasing and this results in a figure of merit FOM=2βλ/n ₂ that remains relatively low at 800 nm, meaning that this series of highly non-linear glasses should be very suitable for optical switching applications at telecommunication wavelengths.