Polygrain icosahedral Al-Pd-Re quasicrystal as a granular electronic conductor

The mechanism of low-temperature electronic transport in polygrain samples of icosahedral Al-Pd-Re is analyzed by analogy with granular electronic systems. The intergranular tunneling and electrostatic energy (Coulomb blockade) are responsible for a specific behaviour of the electrical conductivity in polygrain samples of icosahedral Al-Pd-Re at low temperatures. Depending on the structural state of the sample, both factors may be important and the variable-range hopping regime, of Efros-Shklovskii's type, takes place. For the strong-coupling state the tunneling prevails, and the low-temperature variation of the electrical conductivity is dominated by the Coulomb-interaction and weak-localization corrections

Effect of Re content on elastic properties of B2 NiAl from ab initio calculations

The effect of substitutional alloying of Re on elastic properties of B2 NiAl has been studied using first-principles electronic-structure calculations by the exact muffin-tin orbitals method and the coherent potential approximation. Our calculations have shown that elastic constants C-12, C-44 and bulk modulus B of (Ni1-xRex) Al alloys increase with Re composition almost linearly, but concentration dependence of elastic constants C-11, Young modulus E, shear modulus G, G/B ratio and the Cauchy pressure P-C is strongly nonmonotonously and has peculiarities near the concentration x = 30 at.% Re. Analyzing the density of states and Fermi surface sections we have a direct connection between the behavior of the elastic constants of (Ni1-xRex) Al alloys and changes in the interatomic bonding and Fermi surface topology.Funding Agencies|RFBR|10-02-00-194a|Goran Gustafsson Foundation for Research in Natural Sciences and Medicine||Swedish Research Council (VR)||Swedish Foundation for Strategic Research (SSF) Program in Materials Science for Nanoscale Surface Engineering||</p

Comment on "Nonlinear elasticity of prestressed single crystals at high pressure and various elastic moduli"

We show that elastic moduli of higher (third and fourth) order of prestressed single crystals at high pressure, obtained from the Gibbs free energy, enter the relation between the Cauchy stress and Lagrange finite-strain tensor the same way they do for the second-order elastic moduli and, therefore, directly describe the nonlinear elasticity of prestressed crystals.Funding Agencies|Russian Foundation for Basic Research [19- 02-00871]; Russian Science Foundation [18-12-00492]; Swedish Government Strategic Research Areas in Materials Science on Functional Materials at Linkoping University [2009 00971]; Swedish Research Council (VR) [2019-05551]; Knut and Alice Wallenberg Foundation; ERC (Synergy Grant FAST- CORR) [854843]</p

Career Development and Gender in Latvia and Finland

Šī bakalaura mērķis ir noskaidrot dzimuma ietekmi uz karjeru Latvijā un Somijā. Darbā aplūkota dzimumu līdztiesības vēsturiskā attīstība abās valstīs, atšķirības mūsdienu darba tirgū, ģimeņu ar maziem bērniem vieta darba tirgū, izglītības ietekme uz karjeras izaugsmi, kā arī citi faktori, kas palīdz noteikt dzimuma ietekmi uz karjeru. Darba gaitā izmantoti Latvijā un Somijā līdz šim veiktie pētījumi, kuri iepriekš nav tikuši salīdzināti, abu valstu centrālo statistikas biroju sniegtie dati, kā arī valstu politikas dokumenti.The aim of bachelor thesis Career Development and Gender in Latvia and Finland is to research gender’s influence on career in Latvia and Finland. Some of the topics covered in the paper are historical development of gender equality, differences in labor market, the situation of families with small children in labor market, as well as influence of education on career development. Materials used in research include researches done till now in Latvia in Finland, whitch are not compared between themselves, the date provided by Central Statistical Bureaus of both countries and policy documents

Significant correlation between macroscopic and microscopic parameters for the description of localized plastic flow auto-waves in deforming alloys Significant correlation between macroscopic and microscopic parameters for the description of localized pla

Abstract Understanding of mechanical properties of materials and a possibility to predicting them from ab initio calculations have fundamental importance for solid state theory. In this work we establish a significant correlation between the product of the macroscopic parameters of localized plastic flow auto-waves in deforming alloys, their length and propagation rate and the product of the microscopic (lattice) parameters of these materials, the spacing between close-packed planes of the lattice and the rate of transverse elastic waves. Thus, these products can be regard as invariants of plastic and elastic deformation processes, respectively. Moreover, the established regularity suggests that the elastic and the plastic processes simultaneously involved in the deformation are closely related. Our work also demonstrates that ab initio simulations can be used for the prediction of parameters of localized plastic flow auto-waves in deforming alloys