Undeca­europium hexa­zinc dodeca­arsenide

The title compound, Eu11Zn6As12, crystallizes with the Sr11Cd6Sb12 structure type (Pearson’s symbol mC58). The complex monoclinic structure of the first arsenide to form with this type features chains made of corner-sharing ZnAs4 tetra­hedra, separated by Eu atoms. There are a total of 15 unique positions in the asymmetric unit. Except for one Eu atom with site symmetry 2/m, all atoms are located on mirror planes. An usual aspect of the structure are some Zn—As distances, which are much longer than the sum of the covalent radii, indicating weaker inter­actions

Penta­europium dicadmium penta­anti­monide oxide, Eu5Cd2Sb5O

The title compound, Eu5Cd2Sb5O adopts the Ba5Cd2Sb5F-type structure (Pearson symbol oC52), which contains nine crystallographically unique sites in the asymmetric unit, all on special positions. One Eu, two Sb, and the Cd atom have site symmetry m..; two other Eu, the third Sb and the O atom have site symmetry m2m; the remaining Eu atom has 2/m.. symmetry. Eu atoms fill penta­gonal channels built from corner-sharing CdSb4 tetra­hedra. The isolated O atom, i.e., an oxide ion O2−, is located in a distorted tetra­hedral cavity formed by four Eu cations

Diytterbium(II) lithium indium(III) digermanide, Yb2LiInGe2

The title compound, Yb2LiInGe2, a new ordered quaternary inter­metallic phase, crystallizes with the ortho­rhom­bic Ca2LiInGe2 type (Pearson code oP24). The crystal structure contains six crystallographically unique sites in the asymmetric unit, all in special positions with site symmetry .m.. The structure is complex and based on [InGe4] tetra­hedra, which share corners in two directions, forming layers parallel to (001). Yb atoms fill square-pyramidal (Yb1) and octa­hedral (Yb2) inter­stices between the [InGe4/2] layers, while the small Li+ atoms fill tetra­hedral sites

Dibarium tricadmium bis­muthide(-I,-III) oxide, Ba2Cd3−δBi3O

Ba2Cd2.13Bi3O, a new bis­muthide(-I,-III) oxide, crystallizes with a novel body-centered tetra­gonal structure (Pearson code tI36). The crystal structure contains eight crystallographically unique sites in the asymmetric unit, all on special positions. Two Ba, one Cd and two Bi atoms have site symmetry 4mm, the third Bi atom has mmm. and the O atom has m2 symmetry; the second Cd site (2mm. symmetry) is not fully occupied. The layered structure is complex and can be considered as an inter­growth of two types of slabs, viz. BaCdBiO with the ZrCuSiAs type and BaCd2Bi2 with the CeMg2Si2 type

Информационная система оценки риска банкротства предприятия с помощью нейросетевой модели

Объектом исследования является процесс оценки риска банкротства предприятия. Целью работы является проектирование и разработка информационной системы для оценки риска банкротства предприятия на основе нейросетевой модели. В процессе исследования проводился теоретический анализ, обзор аналогов, проектирование и разработка информационной системы. В результате работы спроектирована информационная система для оценки риска банкротства предприятия, реализующая следующие функции: расчет значений основных финансовых показателей и построение нейросетевой модели; оценка риска банкротства на основе модели; анализ результатов оценки. На данный момент система проходит тестовые испытания на предприятии АО "Сибкабель", г. Томск.The object of study is the process of assessing the risk of bankruptcy. The aim of this work is the design and development of information system for assessing the risk of bankruptcy of the enterprise based on neural network model. In the process of research was conducted the theoretical analysis, a review of analogues, the design and development of information systems. As a result of work designed information system for assessing the risk of bankruptcy of the enterprise that implements the following functions: calculation of values of main financial indicators and the construction of neural network model; evaluate the risk of bankruptcy based on the model; analysis of the evaluation results. At the moment the system is being tested at the enterprise of JSC "Sibkabel", Tomsk

Определение технических характеристик размешивания и проектирование оборудования для вязких сред

Существенным недостатком подходов у многих исследователей является большое количество упрощений расчетных моделей и невозможность точной количественной оценки параметров технологического процесса перемешивания. В данной работе, эффективность перемешивания трех видов импеллеров была исследована. Все расчеты и анализы были проведены с помощью не только физических моделей но и Ansys v17.2, что обеспечил качество результата данного исследования.In this study computational fluid dynamics (CFD) approach was used to study mixing in an Industrial tank. We use Ansys v17.2 to do the evaluation of fluid mixing efficiency. In this study we use three different mixer models to do the comparison. The objective was to analyze the extent of mixing in the tank by producing visual images of the various mixing zones in the tank domain

Data from the electronic band structures of several Zintl phases with group 15 elements and the transition metals

Electronic band structures of the following compounds – Cs4Cd(As7)2, K2PdP2, K5CuAs2, Na2CuP and K3Cu3P2 – all computed by means of the TB-LMTO-ASA code. The calculations show that for all compounds, the bonding states are occupied, while the antibonding orbitals are vacant. This confirms the partitioning of the valence electrons according to the Zintl–Klemm formalism. The data is related to doi.org/10.1016/j.jssc.2018.11.029 (Ovchinnikov and Bobev, 2019) [1]

Synthesis and Crystal Structure of the Zintl Phases NaSrSb, NaBaSb and NaEuSb

This work details the synthesis and the crystal structures of the ternary compounds NaSrSb, NaBaSb and NaEuSb. They are isostructural and adopt the hexagonal ZrNiAl-type structure (space group P6¯2m; Pearson code hP9). The structure determination in all three cases was performed using single-crystal X-ray diffraction methods. The structure features isolated Sb3– anions arranged in layers stacked along the crystallographic c-axis. In the interstices, alkali and alkaline-earth metal cations are found in tetrahedral and square pyramidal coordination environments, respectively. The formal partitioning of the valence electrons adheres to the valence rules, i.e., Na+Sr2+Sb3–, Na+Ba2+Sb3– and Na+Eu2+Sb3– can be considered as Zintl phases with intrinsic semiconductor behavior. Electronic band structure calculations conducted for NaBaSb are consistent with this notion and show a direct gap of approx. 0.9 eV. Additionally, the calculations hint at possible inverted Dirac cones, a feature that is reminiscent of topological quantum materials