High-temperature electron-hole liquid in diamond films

Using the density functional theory we find the energy and the equilibrium density of the electron-hole liquid in diamond films. The local density approximation is used to account for exchange and correlation energy. In diamond films, electron-hole liquid is multi-component and contains electrons, and heavy, light, and spin-orbit split holes. The nonlinear Kohn- Sham equations for electrons, and heavy, light, and spin-orbit split holes are solved numerically. We find that wave functions of electrons and holes strongly overlap, so the contribution of the Coulomb interaction to the energy of electron-hole liquid is small. The exchange-correlation potentials in the center of the quantum well have a value of the order excitonic Rydberg. The energy of electron-hole pair is calculated for (111) diamond films. It is well known that in diamond crystals, the critical electron-hole liquid temperature of 170 K is observed. We show that the critical temperature of the electron-hole liquid in diamond films can reach 260 K

Methods for supporting the process of diffusion and use of innovations in the agro-based industries

In the modern context, one of the priority tasks for the agricultural development is to create conditions for the prompt transfer of the agro-industrial complex (AIC) to a new technological base. The purpose of this study is to substantiate the tools for assessing the innovative profile of animal husbandry, production and processing of fodder resources; study of means to support dairy farming to identify the impact of government regulation on the diffusion and use of innovations. The study forms the author's paradigm for assessing the innovative state of animal husbandry based on the theories of diffusion of innovations, the most important elements of which are technology transfer and knowledge spillover. The influence of the existing instruments of state support on the diffusion of innovations in dairy cattle operations by groups of regions in Russia is revealed. It is proposed to use indicators of the scale and intensity of innovative support for dairy farming, as well as the regional index of innovative support (RIIS). The findings revealed the priority role of innovative support in increasing the commodity resources of milk; appropriate models of state support were proposed for various groups of regions. To identify the impact of innovative support of dairy farming, an innovativeness matrix has been developed, which can be used to assess the innovation potential of milk production and processing, based on the innovative support resources used. Such methodological approach makes it possible to assess the level of sufficiency of innovative support resources for a fuller use of the industrial potential of both milk production and processing

Electronic structure of a wide quantum wire in a magnetic field at ν=1\nu = 1

The density functional theory is used to study the electronic structure of a quantum wire in a magnetic field. In a GaAs quantum wire, a critical density has been found, below which the electron density has a strong spatial inhomogeneity. The effect of the disorder potential on the electron density profile in a two-dimensional electron gas is estimated

The Stability of the Quantum Hall State at ν=1\nu = 1 in Bilayer Electron Systems

The ground states of electrons in two vertically coupled quantum dots in the presence of an external magnetic field have been studied within the density functional theory. A phase diagram of the transition to the quantum Hall state in double quantum dots has been plotted for the Landau level filling factor $\nu = 1$. It has been shown that the quantum Hall state can be stable for a zero tunnel splitting. The influence of the impurity potential on the stability condition for the quantum Hall state has been analyzed

Structure of quantum levels for two-dimentional electron in the homogeneous magnetic field and the potential confining near to the ring

Studying of properties of quantum rings (nano-scaling and mesoscoping ring structures) in a magnetic field is one of directions on which there are interesting results (see, for example, [1]). Quantum transitions in such structures are accompanied by radiation on border of infra-red light, and interest is caused by periodic structures in which quantum rings are cooperate with neigh calls in pseudo-crystal. In the given work results of calculations of such structure in two-dimension statement (periodicity is provided with decomposition of the solution in Fourier series on both spatial coordinates) are presented. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2058

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High-temperature electron hole liquid in diamond wires

The density functional theory is used to study the properties of the electron hole liquid (EHL) in diamond quantum wires. Take a quantum wire with a circular cross section with radius R. Electrons and holes move freely along the z-axis. To calculate the energy and equilibrium density of the EHL, the Schrödinger equations for electrons and holes are solved numerically. Calculations have shown that the EHL is stable in diamond wires with a radius of several exciton radii. As the radius of the quantum wire decreases, the equilibrium density increases and the EHL energy decreases. So, with the radius of the quantum wire equal to the exciton radius (1.38 nm), the equilibrium linear density and energy of the EHL can reach values of 2.2 ∙ 107 cm–1 and – 317 meV, respectively. Estimates show that for these values of density and energy, the critical temperature of the EHL is Tc ≈ 370 K

Zaryadye Park, Glass Grid Shell Roof

This paper will describe the design, detailing, testing and construction of the structural glass beams which make up the load bearing grid shell structure of the newly built Zaryadye Park in Moscow, Russia. The canopy structure is situated short distance from Red Square and the Kremlin. Structural glass beams, 72 in total, are connected into the main undulating steel grid shell structure which measures approximately 120m long and 60m wide.  The beams themselves vary in length according to the geometry but are generally 3m long, 0.2m deep. The beams meet each other and the main steel structure at bespoke stainless steel nodes, and are topped by triangular glass roof panels. The glass beams were designed to accommodate Moscow’s extreme weather conditions, with drifted snow loads of up to 350 kg/m2. Differential movement of the main structure was another challenge for the design team, and required sophisticated linear analysis with over 150 load combinations. The resulting movements called for further development of the nodal connections and non-linear analysis of their performance. Due to a lack of legislation covering structural glass in Russia a so called ‘Special Technical Standard’ was required.  This document was written with significant input from us and covers the technical aspects of glass and its performance. A full scale mock-up of one roof panel, complete with beams and node connections, was constructed and tested to gain approvals from the authorities. Zaryadye Park is Moscow’s first new major landmark in 50 years and was opened on the 9th of September in time for the City Day celebrations