The study of physical and chemical properties of cobalt catalysts in the synthesis of hydrocarbons by the Fischer-Tropsch method is carried out. The effect of additives promoters NiO, Fe2O3, MnO2, on the specific surface area, pore volume, size of cobalt crystallites, the degree of catalyst reduction is considered

Keywords: Fischer-Tropsch synthesis, synthetic hydrocarbons, catalyst, promoter, carrier, specific surface area, porous structure, catalytic activity, dispersion, cobalt crystallites

The article deals with the construction and definition of the stress-strain state of the design scheme of a lattice tower-like structure in the form of a mesh hyperbolic paraboloid. The dependence of the wind load distribution on the characteristics of the form is established, a sectional calculation method for such structures is given.

Keywords: Hyperbolic paraboloid, finite element method, aerodynamic loads, lattice towers

This article discusses the basic principles of the use of structural membranes in the reconstruction of buildings and structures. Three principles of intervention in the existing architecture are described in detail. The first is to preserve the historical appearance and character of the building. The second is the scale of the new and old parts of the building. The third is the difference and the possibility of reorganizing new designs. The characteristics of the goals, the achievement of which each of these principles is directed, are given. Using the example of several buildings, we analyzed the use of textile membranes to achieve the main goals of reconstruction, described the positive and negative aspects of restoration using textile membranes. These buildings include: a church on a hill in Corbera d'Ebr, Spain (roof restoration), the central courtyard of the Palacio de Mineria, Mexico (creating coverage over a yard area), Salzburg residence, Austria (sliding roof). In conclusion, conclusions were made about the advantages of using membranes for the preservation of historical heritage and possible prospects for the development of fields of application of this design.

Keywords: architecture, membranes, reconstruction, restoration, structural structures

The article analyzes the natural conditions of the Northern latitudes of Russia, where the main reserves of fossil hydrocarbons and metals are concentrated. It is shown that mining requires the development of the road network and artificial structures on the roads. It is noted that the most difficult stage in the construction of bridge structures is the construction of foundations. The types used in the Northern latitudes of foundations are considered, and their positive and negative qualities, such as weight, method of construction and volume of earthworks, are noted. The paper emphasizes the relevance of the problem of maintaining the stability of permafrost soils in seasonal thawing and loss of their bearing capacity. Methods of maintaining the soil in a solid state can be natural and artificial. The methods of thermal stabilization of soils, as well as machinery and equipment used in these conditions.

Keywords: permafrost, road network, bridge, polystyrene, superstructure, pile support, Foundation, thermal insulation screen, heat stabilizer

Red blood cells (RBC) roll like tractor caterpillars along narrow capillaries. On the erythrocyte surface there are charges that, when moving together with the erythrocyte membrane, create a magnetic field in the vicinity of the RBC. Discrete charges are distributed uniformly on the surface of the RBC, their number can reach several million and the charges move together with the RBC membrane. The surface of the RBC is approximated by a truncated cylinder. Discrete charges are located evenly over the surface of the RBC and move along closed curves that are rectangular trapezoids. A mathematical model has been constructed that allows calculating the intensity of the magnetic field produced by mobile charges located on the RBC membrane. According to the Bio-Savart law, the magnetic field strength can be calculated at some point in space if the coordinates and velocity of the charge are known, the distance from the charge to the point and the angle between the velocity vector and the radius vector connecting the charge and the point. If we assume in the first approximation that the medium is isotropic and magnetic currents are absent, then Maxwell's equations can be written out. These equations can be rewritten in the form of equations in finite differences, solving by numerical methods one can obtain distributions of electric and magnetic field strengths in the vicinity of the RBC. Calculations were carried out for different values of input parameters. In the case when the RBCs move through the capillary network, in which the narrow capillaries are located close to each other, the magnetic fields of the RBCs in different capillaries interact, and, as a result, we obtain a new distribution of the magnetic field strength in the vicinity of the capillary network, which varies with time.

Keywords: mathematical model, algorithm, magnetic field strength, electromagnetic interaction, erythrocyte, narrow capillary

To date, the construction of the new techniques of construction of buildings and structures, as well as the most advanced durable and lightweight materials with high performance characteristics. All this allows you to build cost-effective, high-quality and aesthetically attractive houses. Depending on the materials used in the construction of multi-storey buildings was considered the effectiveness of ribbed coffered floors. Calculation of the 18-storey monolithic building was made in the program complex "Lira-CAD-2013". Floor slab typical floor is considered in the following schemes: buildings with a step of columns 6m and 12 m, the ceiling is flat and coffered with a 200mm plate 50mm, different beam cross-sections (200х400мм and 200х450мм), step 900х900 mm. analysis of the results showed that the most advantageous use of coffered ceilings in the building with a column grid of 12 m, with the use of high-strength concrete and reinforcement steel class A500.

Keywords: caisson ceiling, slab, beam, reinforcement, concrete, analysis, consumption, reinforcement, step columns, the cost of construction, structural scheme

It refers to the field of medicine, namely, to ophthalmology and to the field of medical instrument making. The problem of documentary fixation of the pattern of the fundus observed with the help of such devices with the purpose of assessing the long-term dynamics of pathological changes and determining the degree of success of the therapy is still relevant. The purpose of the development is to realize the possibility of automatic and semi-automatic documentary photo fixation of the results of the study of the internal structures of the eye performed with the help of a hand-held mobile ophthalmoscope while preserving the possibility of direct examination of the internal structures of the eye. The goal is achieved by adding to the ophthalmoscope optical, electromechanical and electronic components, which allow photographic fixation of the observed picture of the internal structures of the eye being examined. Advantages and positive effect of the complex being developed: 1. The possibility of automated photographic fixation of the observed image of the fundus allows improving the quality of eye pathology diagnostics by simplifying the documentation of its condition and facilitating the monitoring of the dynamics of this condition. 2. The non-contact nature of measurements determines the reduced requirements for disinfection of the device and for anesthetizing the eye; 3. Automation of the process of photographic fixation allows to reduce time costs for them and to shorten the time necessary for training personnel to work with the complex; 4. Communication of the photophthalmoscope with a PC provides a wide range of local and centralized storage, processing and systematization of research results.

Keywords: Ophthalmoscope, ophthalmoscopy, photographic fixation, eye fundus

It refers to the field of medicine, namely, to ophthalmology and to the field of medical instrument making. In the field of ophthalmology, the actual task is to study the state of the vascular system of the eye, the changes of which are observed in many diseases. Currently, there are no non-invasive devices that allow performing an automated direct measurement of pressure in the vascular system of the eye and evaluation of the mechanical characteristics of the vascular wall of the eye vessels. The purpose of the work: the development of a hardware-software complex for eye pneumovazotonometry. The goal is achieved by synthesizing the circuit of a combined measuring device that combines the functions of measuring hemodynamics in the OCA and the IOP level. The complex includes a measuring module and external software for the PC, designed to work with this module. In the measuring module, a microprocessor control system can be distinguished; pneumatic system; ultrasound system; system of video registration; system of indication and control; system of communication with PC; power supply system.

Keywords: Anterior ciliary arteries, pressure, measurement, ophthalmopneumovasotonometry

The substances released during the operation of automobiles are a mixture of products of complete and incomplete combustion of fuel. They contain several gaseous substances that are toxic and are dangerous to human life and its environment. Preventing and reducing dust effects are essential to protect human health.

Keywords: Dust, environment, gas, transport, city, canerogen, atmospheric air, source, emissions, protection, enterprise

This scientific study presents an analysis of organizational conflicts, as well as problematic aspects of activity in contemporary realities. The effect of organizational conflict on the effectiveness of an individual is shown. The urgency of researching the problem of the activities of the organization’s employees in the context of organizational conflicts, as well as ways to solve them, is given The analysis of the cognitive model. As factors used to reduce tensions in a team, it was proposed to introduce factors for raising qualifications and organizational culture. These factors will influence the target factor - performance. In the course of simulation modeling, it was found that by carrying out activities to improve the skills of employees, measures to increase the level of organizational culture of employees, the organization seeks to reduce tension in the team and, as a result, there is less staff turnover.

Keywords: simulation modeling, cognitive modeling, functional structural analysis, visual analytics, conflict, organization, model, social tension

The problem of lateral buckling of a free-supported wooden strip with a constant narrow cross-section loaded with concentrated force in the middle of the span is considered. In the study of lateral buckling of the beam was used energy method. For the case of load application in the center of gravity, the problem is reduced to a generalized secular equation. The dependence between the value of the critical force and the position of the point of application of the load is obtained. A linear approximating function is chosen for this dependence. The results obtained by the authors are compared with the analytical solution using Bessel functions and the numerical iterative method.

Keywords: thermal conductivity, finite element method, the steady-state temperature field, radiation-heat shield, thick-walled cylinders

The exposure of the Aires resonator to electromagnetic radiation with a frequency of 6 GHz is considered. The resonator is a silicon plate with a diameter of 7.4 mm with circular grooves applied by etching. The resulting resonator with a thickness of 0.5 mm contains 4084101 circles of various diameters, which in orthogonal cross sections represent rectangular slits 0.2 μm wide and 0.6 μm deep. It is assumed that the radiation source falls on the resonator evenly from all sides. Thus, we have a radiation source in the form of a hemisphere, the radius of which is substantially larger than the diameter of the resonator (10 m). The intensity of the incident radiation and the frequency of the radiation are assumed to be known. It is necessary to find: the intensity of the radiation at some point in space above the resonator. (Receiver). If the radiation falls on the resonator not in the slot, then a reflection occurs (the angle of incidence equals the angle of reflection). If the radiation falls into the gap, then the reflection does not occur, and absorption occurs. It is assumed that radiation is diffracted on the slits. If you change the time with a certain step, you can calculate the intensity at any point of the receiver at any time. As a result of irradiation of the resonator over its central part, periodic radiation with frequencies of 6.85 GHz and 5.38 GHz is generated. At other frequencies, radiation is generated that is not periodic and is similar to chaotic radiation. The resonator can be considered as a converter of the incident periodic irradiation into other periodic radiations. These periodic emissions have frequencies that can be resonant for some molecules and parts of living organisms that make up the cells. By varying the depth and width of the slits on the resonator, the size of the resonator and other parameters, it is possible to obtain specific frequencies to which particular components of living cells are sensitive. This will allow targeted action on the cells of a living organism.

Keywords: mathematical modeling, structured silicon surface, high-frequency electromagnetic radiation, resonant frequencies, living organisms

Some approaches to assessment of soundness of investments necessary for implementation of results of research engineering are described. It is proposed to use the method of variation of parameters with the establishment of some restrictions. The results of the application of the proposed methodology are given on the example of evaluating the soundness of investments in the technology of unburnt synthanite from natural raw materials in the apparatus with vortex layer and the production of wall stones based on it. It is rational to use the proposed methodology in the formation of an investment plan, the development of business plans, and the implementation of graduate qualification work. Article is published within implementation of the program of the International Forum «Victorious May, 1945».

Keywords: construction materials producing industry, unburnt synthanite, apparatus with vortex layer, innovation, commercial soundness of investments, investment prospects, method of variation of parameters, uncertainty

Data on the effect on human health of dust from office air conditioners are presented. The microbial and dispersion composition of dust has been studied. Studies have shown that the microbial number in the rooms depends on the floor on which the air conditioner is installed. Also, the presence of large fractions of dust decreases with increasing height at which the air conditioner is installed.

Keywords: air pollution, dispersion analysis, air conditioning systems, human health,bacteria, mukor, aspergillus, penicillium

the article presents experimental studies of a low-power boiler with a furnace of a high-temperature fluidized bed with recirculation of outgoing gases in stationary and transient modes of operation. The experimental installation of the boiler KVP-1,74 WKS with recirculation of outgoing gases is represented and described. The results of experimental studies of the dependences of the coefficient of excess oxygen at of the volume of the recirculation of exhaust gases of the boiler KVP-1,74 VTX at nominal and partial loads, based on the percentage of fuel saving of the boiler from the amount of recirculation of exhaust gases of the boiler KVP-1,74 VTX at nominal and partial loads boilers, graphs of transient processes in boiler "KVP-1,74-VTX" with recirculation of flue gas when changing the fuel consumption, GRAPHS of the comparison of transients in the boiler "KVP-1,74-VTX" with recirculation of flue gas when changing fuel consumption.

Keywords: high temperature fluidized bed, exhaust gas recirculation, experimental studies, automation system