6,7,8,9,10,11-Hexahydro-13H-azocino[2,1-b]quinazolin-13-one

The title compound, C14H16N2O, is a synthetic analogue of quinazolone alkaloids with pyrrilo, pyrido and azopino rings. The quinazolinic part of the mol­ecule is generally planar within 0.037 (3) Å; the eight-membered ring exhibits an inter­mediate conformation between the chair and boat forms as it is typical for cyclo­octene rings. An ethyl­ene group of the azopino ring is disordered over two positions with a refined occupancy ratio of 0.910 (7):0.090 (7). In the crystal, the H atoms of the aromatic rings form weak C—H⋯O and C—H⋯N hydrogen bonds. One C—H⋯O hydrogen bond leads to the formation of a one-dimensional chain. Another C—H⋯O and a C—H⋯N bond link these chains, generating a three-dimensional network

11-(2-Oxopyrrolidin-1-ylmeth­yl)-1,2,3,4,5,6,11,11a-octa­hydro­pyrido[2,1-b]quinazolin-6-one dihydrate

In the crystal structure of the title compound, C17H21N3O2·2H2O, water mol­ecules are mutually O—H⋯O hydrogen bonded and form infinite chains propagating along the b axis. Neighboring chains are linked by the quinazoline mol­ecules by means of O—H⋯O=C hydrogen bonds, forming a two–dimensional network

Methods for Producing High-Temperature Superconductors

This paper presents technologies for obtaining high-temperature superconducting materials

2,3-Dihydro­pyrrolo­[2,1-b]quinazoline-9(1H)-thione

In the crystal, mol­ecules of the title compound, C11H10N2S, are connected by C—H⋯N inter­actions around threefold axes. Furthermore, they form stacks along the c axis showing π–π inter­actions between pyrimidine rings [centroid–centroid distance = 3.721 (1) Å]. The central ring is essentially planar with an r.m.s. deviation of 0.007 Å. The five-membered ring adopts an envelope conformation with the flap atom deviating by 0.241 (4) Å from the mean plane (r.m.s. deviation = 0.002 Å) through the other four ring atoms

Математическое моделирование зажигания растительного покрова в результате разрыва газопровода

В данной работе представлена математическая модель и численные результаты зажигания полога леса в результате разрыва газопровода с образованием "огненного шара" с учетом структурных особенностей и характеристик лесного горючего материала, а также особенности среды, в которой происходит тепловое излучение. Проблема взрывов в нефтехимической промышленности с образованием ОШ является сегодня актуальной для многих стран, включая и РФ. Разработана компьютерная программа, которая используется для определения безопасных расстояний от объектов повышенной опасности (ОПО).This paper presents a mathematical model and results of calculations of the ignition of forest canopy as a result of the gas pipeline rupture with the formation of a fireball taking into account the structural features and characteristics of forest fuel material, as well as the features of the environment in which thermal radiation occurs. The problem of explosions in the petrochemical industry with the formation of the Fire Ball is relevant for many countries now, including the Russian Federation. A computer program has been developed that is used to determine the safe distances from high-risk objects

(E)-3-Propoxymethyl­idene-2,3-dihydro-1H-pyrrolo[2,1-b]quinazolin-9-one monohydrate

The title compound, C15H16N2O2·H2O, was synthesized via the alkyl­ation of 3-hydroxy­methyl­idene-2,3-dihydro-1H-pyrrolo[2,1-b]quinazolin-9-one with n-propyl iodide in the presence of sodium hydroxide. The organic mol­ecule and the water mol­ecule both lie on a crystallographic mirror plane. In the crystal structure, inter­molecular O—H⋯O and O—H⋯N hydrogen bonds link the components into extended chains along [100]

3-Benzyl-6-(2-chloro­benzo­yl)-1,3-benzoxazol-2(3H)-one

In the title compound, C21H14ClNO3, the benzoxazolone ring system is planar (r.m.s. deviation = 0.022 Å) and forms dihedral angles of 75.38 (10) and 65.92 (13)° with the mean planes of the chloro­benzoyl (r.m.s. deviation = 0.045 Å, excluding O atom) and benzyl (r.m.s. deviation = 0.023 Å) groups. The observed structure is stabilized by weak C—H⋯O hydrogen bonds and weak inter­molecular C—H⋯π inter­actions

Calculation of the Total Current Generated in a Tunnel Diode Under the Action of Microwave and Magnetic Fields

In this paper, a formula was derived for calculating the total current generated in a tunnel diode under the action of a microwave field and a magnetic field. In addition, the dependence of the total current of the tunnel diode on the total power induced by the microwave field is theoretically presented and compared with experimental data. For the total current in the tunnel diode, without taking into account the excess current, volt-ampere characteristics was obtained for cases with and without the influence of a microwave field

The Role and Significance of the Digital Economy in the Country’s Economy

this article discusses the concept of the digital economy, its economic essence and development issues. In addition, digital technologies not only improve the quality of products and services, but also reduce overhead costs. At the same time, the most serious problem hindering the development of the country - corruption - also plays a big role in the loss of misfortune

Studying the movement of fertilizers in the fertilizer spreader

The article presents the results of the study to substantiate the angle of the vertical installation of the fertilizer spreader, which localizes the fertilizer between the rows of cotton. Based on the results obtained, a working body is developed for mixing organic and mineral fertilizers during intercropping. The movement of the fertilizer pieces along the X and Y axes was studied. The coordinates of the fertilizer pieces’ landing point on the working surface of the fertilizer spreader, their velocities, and motion equations of the fertilizer pieces in the next jump were created. As a result, the cotton grows equally and yields a good harvest. The movement of the fertilizer pieces and the movement and distribution of the fertilizer spreader along the working surface are studied. It was found that the vertical mounting angle of the fertilizer could be ɛ = 18˚