Design and fabrication of a full-size landing impact test model of the Mars legged lander configuration Master agreement, task order three

Design and fabrication of full size landing impact test model of Mars legged lander configuratio

FORECASTING THE STAFFING NEEDS OF NATIONAL ECONOMIES AND THE IMPORTANCE OF THE FORMATION OF SCIENTIFIC AND EDUCATIONAL CLUSTERS

This article discusses the need to design an innovative infrastructure that encompasses educational institutions, private and state-owned enterprises. Examples and prospects of creating an educational cluster in the oil and gas industry are given. The needs of the modern economic system in the workforce and the capabilities of the modern educational system in their satisfaction are analyzed. The higher school is considered as a set of scientific, production and educational basis. The importance of the formation of scientific and educational clusters in meeting the needs of modern economies is given. The scope of authors' research will be the sphere of forecasting the personnel market in conditions of modern reality and transition to a digital economy

Specific features of the crystal structure and chemical composition of natural olivines

Fifteen olivine crystals were studied using the methods of X-ray diffractometry and optical spectroscopy. The studies revealed a highly nonuniform distribution of Fe2+ ions in olivine grains

Crystal-chemical features of natural olivines based on luminescence data

The photoluminescence and excitation spectra of natural olivines from dunites and harzburgites in Ural Alpine-type hyperbasites have been examined. Emission bands have been observed from SiO4 3- centers (420, 440, and 470 nm) and AlO4 4- centers (460 nm), whose excitation spectra have been recorded. The luminescence is not of recombination type but occurs within centers. Energy-level schemes and electronic transitions are indicated as responsible for the absorption and luminescence in the hole centers. The weak luminescence bands at 630 and 700 nm are assigned correspondingly to Mn2+ in octahedra and Fe3+ in tetrahedra. This is confirmed by the agreement between the excitation spectra and the theoretically calculated energy levels of these ions

Free totally (anti)symmetric massless fermionic fields in d-dimensional anti-de Sitter space

Free massless fermionic fields of arbitrary spins $s>0$ corresponding to totally (anti)symmetric tensor-spinor representations of the $SO(d-1)$ compact subgroup and in $d$-dimensional anti-de Sitter space are investigated. We propose the free equations of motion, subsidiary conditions and corresponding gauge transformations for such fields. The equations obtained are used to derive the lowest energy values for the above-mentioned representations. A new representation for equations of motion and gauge transformations in terms of generators of anti-de Sitter group $SO(d-1,2)$ is found. It is demonstrated that in contrast to the symmetric case the gauge parameter of the antisymmetric massless field is also a massless field.Comment: 9 pages, LaTe

Optical properties and crystal chemistry of synthetic rutile implanted with cobalt ions

Implantation of high-energy cobalt ions into plates of synthetic rutile has been studied, and absorption, luminescence, and luminescence excitation spectra have been recorded and interpreted. Long-wave luminescence (820 nm) of TiIV 3+ ions in rutile has been revealed; its intensity increased after the cobalt implantation. Analysis of luminescence and luminescence excitation spectra has allowed us to specify the scheme of electron energy levels of rutile and to establish the energy levels of impurity Ti3+ ions occupying vacant octahedrons with the C2h symmetry in structure of the mineral. © Pleiades Publishing, Ltd. 2007

Structure and properties of commercially pure titanium nitrided in the plasma of a low-pressure gas discharge produced by a PINK plasma generator

The paper analyzes the surface structure and properties of commercially pure VT1-0 titanium nitrided in the plasma of a low-pressure gas discharge produced by a PINK plasma generator. The analysis demonstrates that the friction coefficient of the nitrided material decreases more than four times and its wear resistance and microhardness increases more than eight and three times, respectively. The physical mechanisms responsible for the enhancement of strength and tribological properties of the material are discussed

Luminescence of synthetic rutile implanted with cobalt ions

Synthetic rutile plates have been implanted with high-energy cobalt ions. Unusually long-wavelength luminescence (at 820 nm) of Ti VI 3+ ions in rutile, whose intensity increases upon cobalt implantation, has been revealed. Analysis of the luminescence spectra and the luminescence excitation spectra made it possible to refine the electron energy level diagram of rutile and determine the energy levels of Ti3+ impurity ions occupying vacant octahedra with the C2h symmetry in the mineral structure. © 2007 Pleiades Publishing, Inc

Combined surface modification of commercial aluminum

The paper analyzes research data on the structure and properties of surface layers of commercially pure A7-grade aluminum subjected to treatment that combines deposition of a thin metal film, intense pulsed electron beam irradiation, and nitriding in low-pressure arc plasma. The analysis shows that the combined method of surface modification provides the formation of a multilayer structure with submicro- and nano-sized phases in the material through a depth of up to 40 ?m, allowing a manifold increase in its surface microhardness and wear resistance (up to 4 and 9 times, respectively) compared to the material core. The main factors responsible for the high surface strength are the saturation of the aluminum lattice with nitrogen atoms and the formation of nano-sized particles of aluminum nitride and iron aluminides