Zero-Dimensional Model to Study the Effectiveness of Plasma Heating and Thermal Energy Confinement in Globus-M Tokamak in Ohmic Heating Modes

Experimental study of thermal energy confinement in magnetic confinement devices is one of the fundamental problems in plasma physics. The data processing technique covering kinetic and magnetic measurements performed for the Globus-M tokamak is described. A zero-dimensional code has been developed on the basis of this approach making it possible to calculate important discharge parameters during the experiment (between discharges): the electron and ion stored thermal energy content, plasma effective charge, and confinement time. Good agreement of the zero-dimensional calculations and ASTRA modeling indicates that this approach can be applied for routine data processing in Globus-M in view of the specifics of the device.     

Superconductivity at Normal Pressures of Some Organic Metals of (BEDT-TTF)-I System

The discovery by K. Bechgaard, D. Jerome et al.¹ in 1980 of the first organic superconductor, (TMTSF)₂ PF₆, was, in some sence, the final step of a long way to organic superconductivity begun about ten years earliler. Although the existence of a number of organic metals was well established already by 1975, till 1978 there was no assureance that organic superconductors may exist. Because all first organic metals were of 1d type, and their metallic properties did not conserve at low enough temperatures.     

Discrete introduction of the electrophile and nucleophile in AdE -reactions of dicobalt hexacarbonyl complexes of conjugated enynes.

The dicobalt hexacarbonyl complex of the enyne isopropenylacetylene ($\text{1}$) is effective in permitting stepwise Ad_E reactions to the double bond of $\text{1}$ via stabilization of the intermediate carbenium ion.     

Detection of Terahertz,Mid- and Near Infrared Radiation by a Multilayer Metal—Insulator Heterostructure

An analogy between the tunneling of quantum particles through a chain of barriers and the propagation of electromagnetic waves through a metamedium has allowed new methods for the fabrication of selective detectors of terahertz, mid-infrared, and near infrared radiation. The calculations have shown that a resonance metal-insulator heterostructure with one and two metal layers allows achieving nearly 100% absorption of radiation in a narrow frequency range. The use of a large number of metal layers makes it possible to detect ultrashort (including picosecond) field pulses with a broad spectrum.

     

Low-frequency dynamics of DNA in Brillouin light scattering spectra

Brillouin light scattering studies of deoxyribonucleic acid (DNA) in the temperature interval 297–375 K are presented. The DNA fragment (119 bp) from the first intron of D melanogaster limk1 gene with AT-rich insertion (28 bp, mutant agn ^ts3) was used as an experimental sample. The temperature dependence of the hypersonic velocity was found to exhibit anomalies in the vicinity of 347 and 335 K. Computer modeling of possible conformational states which might be attained by the DNA fragment under study has shown the existence of local structures that evolve with varying temperature. Combined analysis of experimental data and results of the modeling reveals a close relation between the anomalous behavior of Brillouin light scattering spectra and conformational DNA dynamics. The results are discussed in the framework of modern models of conformational DNA transformations.     

Inhomogeneous Tl NMR line broadening in Tl2Ba2CuOx single crystals

Temperature and angular dependences of ²⁰⁵Tl line width, Δ , and transverse relaxation time, τ, have been measured in two crystals of Tl₂Ba₂CuO_x with T_c = 32 and 115 K, respectively. In the normal state both Δ and τ have been found to be temperature-independent and not to vary with varying T_c, implying that the size of inhomogeneous broadening is also invariable. Analysis of the line width angular dependence shows that the inhomogeneous broadening originates, most probably, from local distortions associated with Cu substitution for Tl. A conclusion is that variations in T_c are not related to this substitution.