The article discusses the technique of calculating the
combine harvester under various harvesting
conditions. The authors consider two options for
optimizing the fleet of combines: the first, when the
harvested area is set, the second, when the harvested
area is not specified. In the first case, the harvester
park is calculated for a known area with different
harvesting times, but within the boundaries of the
agro-industry. In the second variant, a park of
harvesters is justified and it is calculated how much
space it will be able to clean for a different duration of
harvesting operations
The article analyzes the ways of ensuring a stable
quality of fruit in the process of storage. The patented
methods of storage, realization of which allows
increasing of storage life of agricultural products by
means of using low temperatures, regulating the content
of gaseous medium in the storage, creating hermetic
storing conditions, treating with chemical substances,
using biopreparations, were systematized. The analysis
of literature sources and patent information has show
that the development of methods for storing plant raw
materials with using biopreparations is up-to-date
Modern small logging enterprises exporting timber
primarily by lorry transport do not have resources for
implementing research that contributes to reducing
the cost of this type of transport. Besides, there is no
universal and accessible planning methodology and
operative decision-making in the organization of
timber export by lorry transport. Because of this, the
author of the article has proposed a methodology for
improving international timber transportation by
timber trucks. This methodology contains logging
modeling simulation, as well as analysis and contain
of different options of logging. Within the framework
of this methodology, a unique model based on the
discrete event simulation has been developed. This
model simulates a full cycle of timber transportation
from the terminal to several foreign consumers. The
working capacity of the model was verified by
simulating several export scenarios based on data
obtained during field study at one of the logging
enterprises, the annual logging volume of which is
400 thousand cubic meters. The analysis and
comparison of the modeling results have confirmed
the possibility of using this methodology in planning
and organizing international timber transportation for
small logging enterprises
This study proposes a method of determining the cost
of 1 sq. m. apartment on the example of Krasnodar,
which is especially important in connection with the
necessity of reliable and valid assessment of the
property value in a modern market economy. We have
performed an analysis of data on apartments in
Krasnodar from the site of the Regional Energy
Commission - prices and tariffs department of the
Krasnodar region. We have also had an exploratory
analysis of available data on the subject of emissions
and insignificant data (by constructing line graphs and
scatter plots); we have also checked for possible
dependencies between observations and between
variables (built correlation matrix). We have selected
variables is linear, the regression model for the
variable "cost of 1 sq. m the total area, ths. rub.
"(multiple regression). Using regression analysis as a
method of mathematical statistics we have revealed a
form of analytical dependence of the result of the
predictor variables and the degree of this dependence
In this article, we consider problems of power supply of modern electronic devices. The author proposes a new concept of source of power, which resolves this problem. In addition, this article describes limitations of existing desertions in the area of power supply. In the article, we suggest ways of resolving this limitation by creating a new source of power based on principles, which are different from the existing way. In this article, we develop a theory of creating a universal modular source of power, which would have some advantages. This article considers an optimal structural scheme of that source. We have developed a source of power which meets the requirements of power supply of modern electronic devices and has a potential supply for the next development
It is estimated that (85-95%) of the electric motor
failures occur due to damage to the stator winding. In
this case, more than 90% of damage are because of
interturn short circuits. Short circuits in stator windings
of stand-alone asynchronous generator change the base
magnetic flux incidentally, so the probability of its long
work with such kind of damage is great. A latent
failure, existing as a loop closure, significantly reduces
the reliability of the generator as a backup power
source. Now sensitive protections of asynchronous
generators do not exist, since it is believed that in the
case of short circuits (short circuit), the generator loses
its excitation, and protection is not required for it.
Identification of information signs of short-circuit
currents in the stator winding of an asynchronous
generator makes it possible to develop relay protection.
The main principle of detection of stokes closures in
the stator winding of an asynchronous electric motor is
the measurement of the emerging asymmetry of the
stator currents. It has been established that in the case
of short-circuit faults, the asymmetry of the currents
and voltages is not large and comparable to the
asymmetry in the AAG load circuit. This does not
allow performing a protection that reacts to this
asymmetry. You can also say about changing the
harmonic spectrum of currents and voltages. To build
protection, it is necessary to use highly sensitive
circuits for detecting the asymmetry of a three-phase
system of currents and voltages, as well as distortion of
the shape of currents and voltages, for example, by
harmonic analysis. Do not exclude the possibility of
using other protection devices, such as reacting the
vibration of the case of an induction generator in the
event of damage to the stator winding
The electric method of gas dedusting is the most
effective, since it allows capturing solid particles with
a size from 0.01 µm to tens of microns. The efficiency
of dust and gas cleaning equipment of Novocherkassk
SDPP for cleaning flue gases from ash at power units
1-7 in the period from February 2015 to February 2017
is considered. The main equipment is electrostatic
precipitators. As a solid fuel, Donetsk culm is used. It
is established that the efficiency of waste gas
purification at power units 5-7 was about 99 %, while
at power units from the 1st to the 4th this value was
within 95-96 %. The data obtained correspond to the
design data, but it is recommended that the cleaning
devices be improved to improve their efficiency. The
most acceptable is a combined electrofilter-bag filter
The market for functional food products is continuously
increasing and, according to analysts, by 2020 its
share will reach 40% of all food products. The development
of the healthy food has been gathering momentum
in recent years, the search for non-traditional
types of raw materials is constantly being conducted,
and new recipes for products enriched with natural
food additives are being created. In this regard, special
attention is paid to the production and use of powdered
food additives from plant raw materials. Theoretical
significance and practical applicability of powder
technologies in different years was substantiated by
such famous scientists as Deryagin B.V., Donchenko
L.V., Zimon A.D., Zubchenko A.V., Kasyanov G.I.,
Magomedov G.О., Paschenko L.P., Rebinder P.A.,
Tilesnik M.A., Yankhin E.D. In their opinion, using
natural food additives, it is possible to obtain functional
food products with specified chemical composition
and properties. The objects of our research were apricot,
grape seeds, pumpkin flesh, black currant and seabuckthorn
berries, spinach, apples and flour from lowfat
barley. In the course of the study, the effect of dispersity
of the obtained powders on their antioxidant
activity and frictional properties was studied. The expediency
of introducing powders into the composition
of multicomponent food products for enriching them
with carbohydrates, vitamins and microelements is
shown. The organoleptic evaluation of the produced
powders showed that they have high taste values. The
study of organoleptic and microbiological indices of
products enriched with such powders indicates prolongation
of their shelf life. As the main results of the study, we note the assessment of the chemical composition
of the powders from the investigated objects, as
well as the improvement of the technology of drying of
plant raw materials with sparing technological regimes
of its implementation
The present level of development of power systems,
the need to increase their resources and increased
competition have caused especially true problem of
increasing the efficiency of their operation. The work
is devoted to the justification of the selection and
development of a technique of construction of the
diagnostic model to search for failures in power
objects
According to its operating principles, generators of
aircraft electric power supply systems do not differ
from the similar generators of transporting and
stationary systems, but have range of peculiarities:
low weight and dimensions, high density of armature
current, compulsory cooling (air and liquid), high
frequency of rotor spinning. The article considers main
requirements, imposed to generators of flight vehicle
and the construction peculiarities and main physical
and operational characteristics of generators applied in
modern flight vehicles. It is suggested to use noncontact
electrical machines as sources of electrical
energy in the aircraft electric power supply systems:
synchronous generators with impulses from permanent
magnets and asynchronous generators with capacitive
impulse. To improve physical and operational
characteristics of generators and aircraft electric power
supply systems it is suggested to refuse from
permanent frequency spinning drivers which have low
converters as stabilizer of voltage and frequency
current of electrical energy source. The peculiarities of
its operation are considered, its advantages and
disadvantages. It is possible to improve characteristics
of aircraft electric power supply systems by means of
study of the electromagnetic compatibility of the main
functional system elements and by means of
application of non-contact electrical devices, applied in
the guard and control systems, made on the basis of
power and electronic devices