Solid-phase synthesis of nanocrystalline lanthanum zirconate using mechanical activation

Nanocrystalline lanthanum zirconate La₂Zr₂O₇ was synthesized by the solid-phase method using preliminary mechanical activation of a La₂O₃ and ZrO₂ mixture. Processes occurring during heating the mixture of mechanoactivated lanthanum and zirconium oxides were studied using the X-ray phase analysis, IR spectroscopy, and complex thermal analysis. Synthesized lanthanum zirconate was characterized by the X-ray phase analysis and transmission electron microscopy methods.     

Effect of π-Extended Substituents on Photophysical Properties of BODIPY Dyes in Solutions

Four boron-dipyrrine (BODIPY) based dyes with π-extended substituents in 8-position of dipyrrin ligand have been synthesized and characterized. Photophysical properties of the obtained compounds have been investigated in different individual solvents. Deposits of solvent polarity and viscosity were evaluated. BODIPY with 8-biphenyl substituent was found to be the fluorescent molecular rotor in contrast to more extended substituents. The complex nature of solvent-solute interactions leads to the poor applicability of standard multiparameter approaches to BODIPY solvatochromic properties. Fluorescence intensity was found to increase in case of solvent polarity growth, it is not typical for BODIPY. Taking that into account the BODIPY with π-extended substituents could be used for fluorescence viscosity measurements, and as the fluorescent media polarity indicators in analytical chemistry and biochemistry.     

Two-Dimensional Coordination Polymer {[Bi(Рyz)I3]}: Structure and Analysis of the Packing Using the Hirshfeld Surface Method

Russian Journal of Coordination Chemistry - The reaction of BiI3 with pyrazine in tetrahydrofuran affords the two-dimensional coordination polymer {[Bi(Pyz)I3]} (I), whose structure is determined...     

TRIIODIDE SALTS OF 4-DIMETHYLAMINO- AND 3-BROMO-1-METHYLPYRIDINIUM: CRYSTAL STRUCTURES AND FEATURES OF NON-COVALENT I⋯I INTERACTIONS IN SOLIDS

Journal of Structural Chemistry - Triiodide salts of pyridinium-derived cations of the composition CatI3 (Cat = 4-dimethylaminopyridinium (1), 3-bromo-1-methylpyridinium (2)) are...     

Simple and pseudosimple algebras with operators

In this work, algebras with operators, i.e., algebras with an additional system of unary operations acting as endomorphisms with respect to the basic operations, are considered. We find necessary conditions for the simplicity and pseudosimplicity of an arbitrary universal algebra with a fixed operator and explore how several properties of congruences of this algebra depend on the structure of the unary reduct of a given algebra. For algebras with one ternary operation, defined in the standard way and satisfying the Mal’cev identities, and one operator (i.e., unars with Mal’cev operation), necessary and sufficient conditions for their simplicity and pseudosimplicity are obtained.     

Tomographic Maps of Typical Radio Signals and Their Superpositions

Following the procedure of noncommutative tomography of analytic signals, some typical radio signals are analyzed. Tomograms of rectangular pulses, delta-pulses, and Gaussian signals are presented. Properties of the noncommutative tomography method are discussed.     

Comparison of PCR and ELISA methods for the detection of bovine leucosis in dried blood spots

PCR and ELISA methods for the detection of bovine leucosis in dried blood spots on porous membranes were compared. Dry samples were analyzed through real-time PCR, using several diagnostic test systems. Nineteen and 20 samples were identified as positive by PCR and ELISA, respectively. Fourteen of these samples were identified as positive by both methods. When using PCR and ELISA, 26 samples were identified as positive for leucosis, which amounted to 47% of the total number of tested samples. The results of the analysis of dried and native samples were in good agreement. The obtained results showed that whole blood sampling in the form of dried spots applied on membrane can be used as a convenient and reliable way to obtain dry samples of biological fluids with the purpose of screening herds for infectious diseases, in particular for bovine leucosis.     

Direct evidence of two superconducting gaps in FeSe<Subscript>0.5</Subscript>Te<Subscript>0.5</Subscript>: SnS-Andreev spectroscopy and the lower critical field

We present direct measurements of the superconducting order parameter in nearly optimal FeSe Te single crystals with the critical temperature T _C ≈ 14 K. Using the intrinsic multiple Andreev reflection effect (IMARE) spectroscopy and measurements of the lower critical field, we directly determined two superconducting gaps, Δ_L ≈ 3.3?3.4 meV and Δ_S ≈ 1 meV, and their temperature dependences. We show that a twoband model fits well the experimental data. The estimated electron–boson coupling constants indicate a strong intraband and a moderate interband interaction.     

Design of medium–temperature solid oxide fuel cells on porous supports of deformation strengthened Ni–Al alloy

An approach was developed towards design of medium-temperature solid-oxide fuel cells based on a deformation strengthened Ni-Al alloy. Methods of sintering were described that allowed obtaining layers of complex oxides with ionic and mixed conductivity and with regulated porosity in the range of 40–1%. Power density of a fuel cell on a metallic support reaches 500 mW/cm² already at 700°C when humid H₂ was used as fuel and air was used as an oxidant. Analysis of fuel cell cross-section after tests showed absence of fractures, flaking, and new phases with low conductivity, which proves good compatibility of all materials used in fuel cell design.