In this article, we have presented the study and
implementation of the physical model of
motion of two coupled pendulums with use of
numerical methods. When building the model
we were using the method of Euler solutions of
differential equations, which displays
pendulums visual motion, as well as building
graphics of functions of speed, angle and
acceleration depending on time with high
reliability. We have generated equation of
motion for generalized coordinates for the first
and second mathematical pendulum. The
generated application implements a physical
model of a double mathematical pendulum,
commit sustained oscillations with the ability
to change the basic parameters: deflection
angle, speed, mass and length of the rod in C++
language by programming environment
“Embarcadero RAD Studio”. This application
can be used as a model of a double
mathematical pendulum in the study of
oscillations, as a methodical manual and a
virtual laboratory in physics, informatics and
programming classes – for demonstration,
study and create applications in the objectoriented
C++ programming language
One of the most important problems facing agricultural production is to increase traction and energy properties and to decrease the deforming effect of wheel propellers of power tractors on the soil. The solution to this problem requires the widespread introduction of computer-aided design systems, which make it possible to predict the towing, fuel, economic, and agro-technological properties of the tractor unit at the design stage. Traction and energy indicators of wheeled agricultural tractors, the level of impact of wheel propellers on the soil are largely determined by the quality of pneumatic tires. The search for the optimal parameters of pneumatic tires, the compliance of tire characteristics with the parameters and operating conditions of the tractor unit, require solving two main problems. Firstly, the development of analytical dependencies describing the process of interaction of elastic wheels with the soil base, depending on the rolling mode of the wheel. Secondly, bringing to the engineering level the methods of calculation and analysis of the wheel propellers and soil system. The work discusses the issues of physical and mathematical modeling of a pneumatic wheel and soil system. It is noted that among the existing approaches to describing the process of interaction of an elastic wheel with soil, it is most preferable to use rheological models that take into account the simultaneous deformation and subsequent restoration of the soil and tire. However, when it comes to the existing models, the formation of the area of the contact patch is associated with a common normal deflection, which is not confirmed by numerous experimental studies. In the present work, the concept of agrotechnological deflection of a pneumatic tire is introduced. The developed model makes it possible to calculate the rut dept, the tangential and radial deformations of the tire, the longitudinal and normal deformations of the base, and the contact pressure under a known normal load on the wheel, wheel rolling radius and speed. We have also presented analytical and experimental dependences of the contact pressure and the rut depth on the size of the agrotechnical deflection
The article discusses the analysis of the new rules of the civil code of the Russian Federation on legal entities; determine the positive and negative aspects of the application of the rules. The author comes to the conclusion about the absence of reasonable grounds for the completion of the legislative work in building a system of legal entity
The article discusses the analysis of the new rules of the civil code of the Russian Federation on legal entities; determines the positive and negative aspects of the application of the rules. The author comes to the conclusion about the absence of reasonable grounds for the completion of the legislative work in building a system of legal entity
The article describes the structure and content of activities disclosed educational work of the faculty at the Department as part of a systematic approach to the problem of educating students in the modern university
There was considered the organization of labor force reproduction in this article. There was carried out the analysis of provision with mechanized working staff during spring-field works in rice-growing districts of Krasnodar region and the count of their need was done. Recommendations on personnel staff were given
It is noted that the grain market has a key influence on food supply in our country. Today, in the conditions of import substitution, many animal products continue to be received from abroad in large volumes, among which grain is a feeding base, although those products can be produced domestically with high profits. In recent years, our country has become a large grain exporter and had been set among the four world's largest grain sellers at the world market. Now, the main problem of the grain business has become not manufacturing but the effective management and marketing of grain sale on domestic and foreign markets. Under the "grain market", the authors understand an integrated mechanism covering the entire process of production - processing - logistics - marketing of grain products, ensuring access to the consumer. The authors note that today there should not be rigid boundaries in the management segments of the grain market, as all sectors of the market are technologically linked through a set of integrated activities. Also they are bringing up their model of functioning management of the grain market, which clearly demonstrates the basic blocks of the investigated production systems, their connections and relationships. The practical implementation of such cooperation promises to participants of the grain market to get a certain synergistic effect due to the systemic functioning of technological, logistics, marketing and other business relationships between all parties; as well as adjustments to price ratios and more sophisticated economic instruments for investment in that business
For the conservation of biodiversity, this study of
patterns of biological processes and phases in the
development of Convallaria majalis L. that are
repeated annually becomes actual. In the article, we
have presented an analysis of five years of
observations of the rhythm of the development of
Convallaria majalis L. in the conditions of the middle
Don. There were allocated phenological phases of lily
of the valley: vegetative (beginning of sprout growth,
deploying of leaves), bud formation, flowering
(disclosure of the first flower, mass blossoming, the
withering of separate flowers, the ending of
flowering), fruitage (the beginning of fruit setting,
mass of fruit setting, mass ripening of fruits), the end
of the vegetation (appearance of the first changes in
color of leaves, the complete drying). We have defined
daily average temperature and the appropriate amount
of positive temperatures for the passage of various
phases of development Convallaria majalis L. By the
results of two growing seasons, the optimal daily
average temperature for the flowering period is 14,3 °
C (the sum of average daily temperatures 161,3-204,
0С) - until 9-15 days. At higher daily air temperatures
flowering begins at lower amount of positive and
effective temperatures after 40-45 days after the start
of the vegetation. At lower daily air temperatures
flowering is longer than at higher. In the conditions of
the middle Don there were allocated some examples of
Convallaria majalis L. which bloom two years in a
row
The article considers the possibility of using a potato harvester with an unloading device. The principle of operation of an unloading device based on a potato harvester is presented. The unloading device of the root-harvesting machine allows to prevent damage to tubers by damping the speed and lowering the height of the falling heap due to the use of the unloading gutter equipped with a lifting-lowering mechanism made of two differently inclined flat sections, on the inner surface of which, across the gutter, elastically deformable elements are fixed in the form loop absorbers. A group of authors carried out a comparative assessment of the tests of the basic model of the AVR Kolnag potato harvester Spirit 6200 and its improved experimental version with an unloading rating device. The studies were conducted on the fields of the Danko farm of the Lukhovitsky district, Moscow region in 2018 - 2019. Harvesting was carried out alternately from several fields. According to the data obtained, it was found that the level of damage to potato tubers when using the developed experimental version of the unloading device of the potato harvester is 2.1%, which is lower in comparison with the basic model of the harvester. The obtained results of field studies of the experimental unloading device confirmed the results of previous theoretical calculations and laboratory studies, including the high efficiency of the developed device compared to the serial analogue
It is shown that for preparation of the concentrated forages it is expedient to use the vibration principle of mixing with use of big amplitudes of movements of components of forages from 10 to 500 mm. and more which can be done when using relative screw drums at the expense of the flat or curvilinear elements which are discretely located on perimeter of a relative screw drum placed on perimeter at an angle not only to an axis of rotation of a relative screw drum, but also to each other, the difficult spatial movement with a big amplitude of movements from 10 to 500 mm is reported to particles of components of forages. Possibility of creation of resource-saving technologies and the equipment for mixing of components of forages is shown. Earlier it was limited to low intensity of the proceeding processes and localization in a limited zone, and also small sizes of amplitudes of fluctuations in known designs. In the offered designs of the equipment for mixing of components of forages the movement of particles of components of forages is provided with an original design of working bodies – the relative screw drums making only a rotary motion round own axis. The difficult spatial movement with a big amplitude from 10 to 500 mm and more, is reported to particles of components of forages by walls of a relative screw drum of various standard sizes and configurations which becomes complicated screw lines and screw surfaces directed towards to each other on perimeter of a screw drum therefore process duration ranging from 1,5 min. till 1.75 min. is sufficient for high-quality mixing of particles of components of forages in a relative screw drum