Development and investigations of a separation unit made of louvers with moisture traps

We present the results obtained from tests of louvers and elaboration of the design of a louver unit with moisture traps for a new generation of moisture separators/steam superheaters for turbine units operating at nuclear power stations.     

Lamb Wave Ultrasonic Detection of Barely Visible Impact Damages of CFRP

Russian Journal of Nondestructive Testing - Results of applying a Lamb-wave-based ultrasonic technique to detect impact damages to a CFRP honeycomb panel are presented. The technique is based on...     

Transport properties of cobalt monosilicide and its alloys at low temperatures

The electrical resistivity and thermopower of cobalt monosilicide (CoSi) and dilute alloys of CoSi with iron at temperatures from 2 to 370 K are experimentally investigated. CoSi is a semimetal and considered to be a promising thermoelectric material. It crystallizes into the cubic structure without an inversion center. This feature suggests the existence of topologically nontrivial electronic states and makes CoSi a candidate for the Weyl semimetal class. The main goal of the study is to find experimental confirmation of this assignment. It is shown that the experimental temperature dependences of the electrical resistivity and thermopower of CoSi and Co_1–xFe_xSi (x = 0.04) at low temperatures cannot be interpreted within the standard theory of conductivity in metals and may be related to topological features of the electronic structure of this compound.     

Luminescence of disordered crystals with langasite structure doped with chromium ions

The luminescence, absorption and circular dichroism spectra of langasite family crystals La₃Ga₅-SiO₁₄ and Sr₃Ga₂Ge₄O₁₄ doped with chromium ions (0.1 at %) are studied in the region of 300–1200 nm. It is demonstrated that these spectra contain bands typical of both a Cr³⁺ ion in an octahedral environment (position 1a) and a Cr⁴⁺ ion in a tetrahedral site (position 2d). The intensities of these bands differ considerably.     

Thermoelectric properties and stability of the Re0.2Sr0.8CoO3-δ Re = Gd,Dy) complex cobalt oxides in the temperature range of 300‒800 K

Temperature dependences of the electrical resistivity and Seebeck coefficient of the Re_0.2Sr_0.8CoO_3?δ Re =?Gd, Dy) complex cobalt oxides in the temperature range of 300 – 800?K have been investigated. The effects of ordering in the cation and anion sublattices on the thermoelectric properties has been examined and their comparative analysis has been made. It was found that, in the investigated temperature range, the thermoelectric power factor of the ordered compounds significantly exceeds the analogous parameter of the disordered samples. The temperature dependence of the electrical resistivity was shown to obey the activation law. As the temperature increases, the samples undergo a semiconductor-semiconductor electronic transition with a decrease in the activation energy. The thermoelectric properties of all the samples are shown to be stable in the investigated temperature range. The maximum thermoelectric power factor of the ordered Dy_0.2Sr_0.8CoO_2.67 cobaltite at a temperature of 360?K has been obtained; it amounts to 0.23?µW/(cm·K²), which is a good parameter for this class of materials.     

Galvanomagnetic Properties of Cobalt Monosilicide and Alloys Based on It

Semiconductors - The Hall coefficient and conductivity of cobalt-monosilicide CoSi, as well as Co1 –xFexSi and Co1 –xNixCo alloys with iron and nickel contents of up to 8 and 5 at %,...     

Thermoelectric Properties of Cobalt Monosilicide and Its Alloys

Semiconductors - Thermoelectric properties of cobalt monosilicide CoSi and (Co1 –xMxSi, M = Fe, Ni) alloys are studied. Alloy compositions with an iron content of up to 10 at % and nickel...     

On the Structure and Thermoelectric Properties of CoSi Obtained from a Supersaturated Solution–Melt in Sn

Semiconductors - The structure, composition, and thermoelectric properties of cobalt monosilicide obtained by crystallization from a supersaturated solution–melt in tin are studied. A...