Rearrangement of cluster structure during fission processes

Results of molecular dynamics simulations of fission reactions $Na_{10}^{2+} \to Na_7^+ + Na_3^+$ and $Na_{18}^{2+} \to 2 Na_9^+$ are presented. Dependence of the fission barriers on isomer structure of the parent cluster is analyzed. It is demonstrated that the energy necessary for removing homothetic groups of atoms from the parent cluster is largely independent of the isomer form of the parent cluster. Importance of rearrangement of the cluster structure during the fission process is elucidated. This rearrangement may include transition to another isomer state of the parent cluster before actual separation of the daughter fragments begins and/or forming a "neck" between the separating fragments

Generalized mathematical model of a linear single-axis accelerometer as an integral part of the inclinometer

The article deals with the creation of a generalized mathematical model of inclinometer that allows more fully than any known prior mathematical model to study its properties under actual operating conditions. The mathematical model of inclinometer considered non-identical electrical parameters of the primary sensors. Mathematical model of a linear single-axis accelerometer is also built, which is part of the inclinometer

Algorithmic approach based on logical qualifiers of subcontractors during creation of large machine-building complexes

The currently stepped price competition stage, in other words, the quality of competition is defined by whether the quality of engineering products depends both on the assembly and on those parts of the product, which is going. The suggested information-analytical tender system, including remote maintenance, connects with the help of web technologies the enterprise financial structure of the workstations operators and authorized persons of contractors located in different geographical areas of the world to form an effective infrastructure for the production, including the incorporation of Russian and foreign small and medium-sized businesses in the technological chain of transnational corporations

Analysis of Soil Pollution in the Sverdlovsk Region

Работа посвящена анализу степени загрязнения почв в Свердловской области. Исследованы пробы почв на содержание в них свинца, меди, нитратов; определены значения рН. Исследования проводились потенциометрическим методом. Обнаружено высокое содержание подвижных форм свинца и многократное превышение ПДК нитратов в пробах почв. Приведены возможные причины загрязнения почв. Отмечено влияние загрязнителей на здоровье человека.The work is devoted to the analysis of the degree of soil pollution in the Sverdlovsk region. Soil samples were investigated for the content of lead, copper, nitrates; the pH values are determined. The studies were carried out by the potentiometric method. A high content of mobile forms of lead and a multiple excess of the MPC of nitrates in soil samples were found. Possible causes of soil contamination are presented. The influence of pollutants on human health is noted

Relevance of Application of Electronic Teaching Aid in Distance Learning of College Students

Статья направлена на обоснование востребованности в применении информационных технологий в образовательном процессе дистанционного обучения в колледжах. Были рассмотрены современные программы для создания электронных учебных пособий. Также в статье приведён пример создания электронного учебного пособия.The article is aimed at substantiating the demand for the use of information technologies in the educational process of distance learning in colleges. Modern programs for creating electronic textbooks were considered. The article also provides an example of creating an electronic textbook

Structure and properties of small sodium clusters

We have investigated structure and properties of small metal clusters using all-electron ab initio theoretical methods based on the Hartree-Fock approximation and density functional theory, perturbation theory and compared results of our calculations with the available experimental data and the results of other theoretical works. We have systematically calculated the optimized geometries of neutral and singly charged sodium clusters having up to 20 atoms, their multipole moments (dipole and quadrupole), static polarizabilities, binding energies per atom, ionization potentials and frequencies of normal vibration modes. Our calculations demonstrate the great role of many-electron correlations in the formation of electronic and ionic structure of small metal clusters and form a good basis for further detailed study of their dynamic properties, as well as structure and properties of other atomic cluster systems.Comment: 47 pages, 16 figure