Ресурсосберегающий метод синтеза нитрида ниобия

Разработка новых методов синтеза нитридов в настоящее время актуальна, поскольку эти нитриды, нитриды и другие металлы широко используются в промышленности.Development of new methods for synthesis of nitrides is currently relevant because these nitrides, and nitrides of other metals are commonly used in industry

Технологические решения для строительства разведочной вертикальной скважины глубиной 3110 метров на газовом месторождении (Тюменская область)

Технологические решения для строительства разведочной вертикальной скважины глубиной 3100 метров на нефтяном месторождении (Тюменской области).Technological solutions for the construction of an exploratory vertical well depth of 3110 meters at an oil field (Tumen region)

Технологические решения для строительства разведочной вертикальной скважины глубиной 2200 метров на нефтяном месторождении (Томская область)

Цель работы — проектирование и строительства разведочной скважины глубиной 2200 метров. В процессе работы был составлен проект на строительство разведочной скважины на глубиной 2200 м. Разработаны мероприятия по организации строительству, охране труда и окружающей среды. В работе рассмотрен вопрос о возможности применения яссов. Дипломная работа выполнена с учетом современных достижений в области техники и технологии строительства нефтяных скважин.The purpose of the work is the design and construction of an exploration well with a depth of 2,200 meters. In the process, a project was drawn up for the construction of an exploration well at a depth of 2,200 m. Developed measures for the organization of construction, labor and environmental protection. The paper considered the possibility of using jars. The diploma work was carried out taking into account modern achievements in the field of engineering and technology of construction of oil wells

Voraussetzungsfreie Thermochemie kristalliner Festkörper

This work deals with an approach to calculate thermodynamic data without the need of experimental measurements. The data obtained can complete, verify or falsify experimental data used in thermochemical calculations. The Gibbs free energy is constructed from the Helmholtz free energy, because the theoretical calculations are carried out at constant volume. Temperature dependent contributions to the Helmholtz free energy were mainly based on the simulation of lattice dynamics. Some other smaller contributions were also included. In the first part the calculated data are compared with well-known experimental data to verify the method used. Temperature dependent heat capacities and entropies of some binary oxides showed good agreement with the data base values. Theoretically calculated vibrational spectra showed a good reproduction of Raman spectroscopic measurements in the case of Barium peroxide. Also mechanical properties, namely the bulk modulus of Barium oxide, showed good agreement with experimental values. The phase transition temperature of tin (alpha to beta) showed a small overestimation. Part two of the work deals with several more complex systems. These play a role by modeling the conditions of fabrication of the high temperature superconductor YBa2Cu3O6+x. The compounds were BaY2O4, Ba3Y4O9, BaCeO3, and the superconductor YBa2Cu3O6+x itself. The first three compounds were necessary to prove the reliability of the data base, which could be verified in most cases. In some cases there have to be made at least some critical considerations. Investigations of YBa2Cu3O6+x included the structure, which depends on Oxygen content x and temperature, the heat of formation and the Gibbs free energy of formation. The temperature and pressure dependent phase transition between the orthorhombic and tetragonal modification of YBa2Cu3O6.5 was obtained in good agreement with the literature. The Gibbs free energy of formation of YBa2Cu3O6+x from binary oxides and oxygen showed good agreement with a greater stabilization of the superconducting phase compared to an equation fitted to several thousand experimental values

Voraussetzungsfreie Thermochemie kristalliner Festkörper

This work deals with an approach to calculate thermodynamic data without the need of experimental measurements. The data obtained can complete, verify or falsify experimental data used in thermochemical calculations. The Gibbs free energy is constructed from the Helmholtz free energy, because the theoretical calculations are carried out at constant volume. Temperature dependent contributions to the Helmholtz free energy were mainly based on the simulation of lattice dynamics. Some other smaller contributions were also included. In the first part the calculated data are compared with well-known experimental data to verify the method used. Temperature dependent heat capacities and entropies of some binary oxides showed good agreement with the data base values. Theoretically calculated vibrational spectra showed a good reproduction of Raman spectroscopic measurements in the case of Barium peroxide. Also mechanical properties, namely the bulk modulus of Barium oxide, showed good agreement with experimental values. The phase transition temperature of tin (alpha to beta) showed a small overestimation. Part two of the work deals with several more complex systems. These play a role by modeling the conditions of fabrication of the high temperature superconductor YBa2Cu3O6+x. The compounds were BaY2O4, Ba3Y4O9, BaCeO3, and the superconductor YBa2Cu3O6+x itself. The first three compounds were necessary to prove the reliability of the data base, which could be verified in most cases. In some cases there have to be made at least some critical considerations. Investigations of YBa2Cu3O6+x included the structure, which depends on Oxygen content x and temperature, the heat of formation and the Gibbs free energy of formation. The temperature and pressure dependent phase transition between the orthorhombic and tetragonal modification of YBa2Cu3O6.5 was obtained in good agreement with the literature. The Gibbs free energy of formation of YBa2Cu3O6+x from binary oxides and oxygen showed good agreement with a greater stabilization of the superconducting phase compared to an equation fitted to several thousand experimental values

Search for the Mysterious SiTe : An Examination of the Binary Si-Te System Using First-Principles-Based Methods

A₁B₁-type tellurides of group 14 elements are of great interest due to their applications as data and energy storage materials. While the features of ATe (A = Ge, Sn, Pb) have been determined, there is no report on SiTe in the solid state. Herein, we review a preexisting controversy in the literature regarding the Si–Te system and provide a feasible approach to SiTe