Designing Klod detector prototypes and results of their experimental tests

The projected KLOD facility is intended for finding and investigating the ultrarare decay K _L ⁰ → π⁰ν$ \bar \nu $ \bar \nu ; its branching ratio predicted by the Standard Model is Br = (3.0 ± 0.6) × 10⁻¹¹. Designing and testing the prototype of the decay-volume veto system and beam veto calorimeter, which are the most important detectors of the facility, are considered. It is shown that the proposed beam veto calorimeter is able to detect γ rays with a high efficiency at the neutron flux of 300 MHz.     

Extraction and preconcentration of anthocyan dye from aqueous solutions with water-soluble poly-N-vinylamides

Extraction of an anthocyan dye with poly-N-vinylpyrrolidone (PVP) and poly-N-vinylcaprolactam (PVC) under the conditions of separation of aqueous solutions of this polymer into two phases in the presence of salting-out agents (sodium chloride and sodium or ammonium sulfate) was studied.     

Power Supply for Generation of Low-Temperature Plasma Jets

Russian Physics Journal - The results of an investigation of the regimes of operation of a specialized power supply, functioning in a system for generation of plasma jets based on a low-current...     

Determination of isothermic compressibility of solvent from changes in the absorbance of a dye solution under pressure

A new method of determination of the isothermic compressibility coefficient of a solvent from a change in the absorbance of a solution of the dye under elevated pressure (up to 100 MPa) was proposed. The method was checked by comparison with the known data for carbon tetrachloride and toluene at 25 °C. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2049–2052, December, 2006.     

Experimental study of direct photon emission in K/it− → π−π0γ decay using ISTRA+ detector

The branching ratio in the charged-pion-kinetic-energy region of 55 to 90 MeV for the direct photon emission in the K ⁻ → π⁻π⁰γ decay has been measured using in-flight decays detected with the ISTRA+ setup operating in the 25-GeV/c negative secondary beam of the U-70 PS. The value Br(DE)=[0.37±0.39(stat.)±0.10(syst.)]×10⁻⁵ obtained from the analysis of 930 completely reconstructed events is consistent with the average value of two stopped-kaon experiments, but it differs by 2.5 standard deviations from the average value of three in-flight-kaon experiments. The result is also compared with recent theoretical predictions. The text was submitted by the authors in English.     

Influence of model hydrometeors on the final stage of a discharge from an artificial charged water aerosol cloud

The characteristics of the final stage of a discharge between an artificial negatively charged water aerosol cloud and the ground in the presence of large model hydrometeors are studied experimentally. With hydrometeors present in the discharge gap, the final stage of the discharge becomes much weaker than without hydrometeors. The spectral characteristics of the final stage of the discharge between the cloud and ground are obtained by processing the current and electromagnetic radiation of the discharge with wavelet analysis. It is found that, in the presence of model hydrometeors, the maximal frequency of the discharge current and the maximal intensity of the discharge radiation at the final stage are several times lower than without hydrometeors. Correlations between the current and spectral characteristics of the discharge at its final stage with and without hydrometeors are found.     

Breathing chimera in a system of phase oscillators

Chimera states consisting of synchronous and asynchronous domains in a medium of nonlinearly coupled phase oscillators have been considered. Stationary inhomogeneous solutions of the Ott–Antonsen equation for a complex order parameter that correspond to fundamental chimeras have been constructed. The direct numerical simulation has shown that these structures under certain conditions are transformed to oscillatory (breathing) chimera regimes because of the development of instability.     

Changes in the chemical state and concentration of iron in carbon nanotubes obtained by the CVD method and exposed to pulsed ion irradiation

Data on the distribution of iron in nitrogen-containing multiwall carbon nanotubes (N-MWCNTs) and changes in its chemical state and concentration under different parameters of irradiation by a pulsed ion beam are obtained by methods of transmission electron microscopy, X-ray photoelectron spectroscopy, and energy dispersion analysis. It is shown that the irradiation of N-MWCNTs with an energy density of 0.5 J/cm² lead to the formation, on their lateral surfaces, of structures with a size of 2–10 nm, consisting of metallic iron encapsulated in a carbon shell. An increase in the energy density to 1–1.5 J/cm² leads to a substantial removal of iron clusters from the tips of carbon nanotubes and a reduction in the amount of iron in the bulk of the N-MWCNT layer.

     

METAL-ORGANIC COORDINATION POLYMERS OF LANTHANIDES(III) WITH THIENOTHIOPHENDICARBOXYLATE LIGANDS

Journal of Structural Chemistry - Three novel metal-organic coordination polymers based on sulfur-containing thieno[3,2-b]thiophene-2,5-dicarboxylic (trans-H2ttdc) and...