It is known, that the voltage deviation from the
nominal value leads to a change in the technical
characteristics of the equipment and may cause a
violation of their working ability, including leading to
an emergency. The article deals with the known
structural diagram of single-phase voltage stabilizers
of AC power, the peculiarities of their work and their
disadvantages. To improve the performance
characteristics of single-phase AC voltage stabilizers,
we have proposed a functional scheme of the
stabilizers performed on transformers,
autotransformers and optosymistors. The article
considers features of the proposed circuit voltage
stabilizers. To stabilize three-phase voltage we have
proposed using a three-phase stabilizer. In this case, to
improve the reliability of the reserve there may be a
single-phase stabilizer, which automatically connects
to the appropriate phase at malfunction of one of the
working electronic voltage stabilizers. To stabilize
three-phase voltage, a stabilizer can be made based on
the three-phase transformer. In comparison with the
use of a single-phase stabilizer in a three-phase
system, the voltage stabilizer will have improved
weight and overall dimensions. To significantly
improve the technical characteristics of voltage
stabilizers, working in the autonomous power supply
systems, it is possible only through the use of modern
mathematical apparatus, allowing to simulate the
physical processes in power circuits of stabilizers in
nominal and emergency modes of operation
The article provides an overview of Express-methods
of quality evaluation and identification of lipidcontaining
plant raw materials (oil seeds) and its
processed products (oil cakes, oilseed meals, vegetable
oils, lecithins) using pulse method of nuclear magnetic
resonance. Development of express methods of quality
evaluation and identification of lipid-containing plant
raw materials and products of its processing is a
priority, as these methods are environmentally safe and
also allow us to regulate technological conditions of
refining processes, are characterized by low error of
determination, i.e., high precision, and, in some cases,
it is only possible to use because of its non-destructive
effects on the analyzed sample. Currently, we can
distinguish the following main directions of quality
evaluation and identification of lipid-containing plant
raw materials and products of its processing on the
basis of the pulse method of nuclear magnetic
resonance: assessment of quality and identification of
oilseeds (sunflower, canola, flax, soybeans);
evaluation of quality of products of processing of oil raw materials (cake and meal); the quality evaluation
and identification of vegetable oils; assessment of the
quality of the lecithins obtained from vegetable oils.
The methods of quality evaluation and identification of
lipid-containing plant raw materials and its products
are patented and have several advantages: short time (5
minutes) spent on the implementation of the single
analysis; eliminates the use of toxic chemicals; does
not require special training of laboratory personnel;
non-destructive character, which is especially
important for oilseeds from the point of view of
breeding work. On the basis of the conducted survey
we can conclude that the pulse method of nuclear
magnetic resonance has found wide application for
assessment of quality and identification of lipidcontaining
plant raw materials and products of its
processing, through rapid capabilities, high accuracy
and ease of analysis
In this article, we consider approaches to the transfer
of knowledge to students and an objective
semiautomatic assessment of knowledge. The
characteristic features of the application and the
possibility of using cognitive training methodologies
and complex systems for testing skills and the
theoretical base of trainees are analyzed. The
problems of development of this direction and
possible ways of their solution are described. The
basic concepts are introduced and the existing
methods of calculating the average score for
checking the student's knowledge are considered,
and a new approach to solving this problem is
proposed. Based on the conducted researches it is
offered to use the complex system of testing of end
users, which includes testing, monitoring, collecting,
analyzing and displaying the results of
students/groups/ course. The main requirements for
the creation of such a complex and the rules to be
followed are formulated for a more objective
assessment of knowledge. A model of an integrated
modular system for objective semi-automatic testing
of knowledge through testing is described
Automation of productions is a necessary condition of reduction of losses for processing enterprises. Any automated system contains subsystems, each of which solves specific objectives, being at the same time accessory of all system. Therefore, when starting designing a system of acceptance and processing of raw materials, it is necessary to define the importance of result of the solution of each task for increase in efficiency of a production cycle. In the article we present results of expert polls of experts – wine makers for definition of problems of automation of processes in the plants of primary winemaking
This article describes the experience in the
development and implementation of the method of
qualimetric evaluation of contractors based on the
application of the methodology of multicriteria rating.
The introduction of the qualimetric assessment into the
practice of management activities allows reducing the
risks of selecting unreliable contractors, to increase the
efficiency of construction and investment companies,
and their competitiveness in the construction services
market
The article formulates and solves the task of discrete
control in the thermophilic stage of the composting
process. It is shown, that considering the relay control
entity to maintain specified process conditions requires
the organization of the sliding mode. We have solved the
problem of minimizing the temperature deviation of the
substrate from the set values and the deviation of the
oxygen concentration in the gas phase of the bioreactor
from the specified values. The article shows an algorithm
to compute the discrete control of the composting
process in the thermophilic stage. This article was
prepared in the framework of the scientific project 16-
48-230441 a(R) "Mathematical modeling of the
processes occurring in the automated installation for
year-round production of organic fertilizers in the
conditions of the Krasnodar region", financed by RFBR
and the administration of the Krasnodar region
The intense rhythm of people's lives in many countries has led to the need to develop and produce «fast food» products. They include dry breakfasts of a porous macrostructure in the form of rods, bars, and flakes, made from cereals, legumes, potatoes and dried fruits. Over the past 10 years, ready-to-eat foods that do not require heat treatment have become popular, the range of breakfast cereals has significantly increased, air grains, pads with filling, asterisks and rings have appeared. The global trend of consumption of slowly digestible carbohydrates predominates. Corn flakes and blown grain began to be used as supplements to soup instead of toast, served for tea and coffee. However, the problem of making and marketing specialized dry breakfasts has not yet been fully solved. The aim of the research is to expand the range of specialized dry breakfasts for people with high physical and mental loads. The tasks of modernizing technology and equipment for the production of dry breakfasts were solved. The methods of preparation for extrusion of easily oxidized in the air raw nuts were developed. Formulations of dry breakfasts for people with high physical and mental loads were developed. The objects of the research are analysis of existing technological schemes, grain, fruit and nut raw materials. We used classical methods of research to determine the composition of proteins, lipids and carbohydrates, as well as modern instrumental methods for assessing the qualitative composition of raw materials, semi-finished products and finished products. The research results include the modernization of technology and equipment for the production of breakfast cereals. Formulations of ready-made breakfast cereals with the addition of cereals, dry fruits and nuts have been developed, in order to improve the quality characteristics and nutritional value of the extrudates. The proposed technology and developed recipes are promising for introduction into production
The article describes the modeling process of the
heating system operation of a livestock-breeding
complex. It presents graphs reflecting the influence of
technological parameters of heat supply system of
cattle-breeding complex with a catalytic combustion
device on the parameters of energy efficiency of the
system and the parameters characterizing the stability
of the temperature conditions in the livestock sector
In this work, we have analyzed the multiple
literary sources and summarized the material
regarding beet dietary fibers. Their composition,
physicochemical, physicomechanical and
hygrothermal properties were studied. The study of
the particle-size distribution showed that the
content of the insoluble fraction exceeded the
content of the soluble fractions in all the samples.
The use of the secondary products of processing of
the plant raw material is also critical; they allow
improving the preventive properties of products
and enriching them with dietary fibers, protein, and
mineral elements. The properties and quality of the
raw material are, to the large extent, determined by
and depend upon its granulometric composition,
that is, upon the size of particles that compose this
object. The authors determined the granulometric
composition of the studied nutritional supplements.
It was found out that the use of the combination of
the impacts together with the abrading impact led
to the intensification of the process, a decrease in
the milling time and the uniformity of the obtained
granulometric composition. The choice of the
vertical mill as milling equipment in combination
with the metal balls added to it to increase the
efficiency of milling and uniformity of the
granulometric composition of beetroot fibers was
proved experimentally
In agricultural production, the direction of introduction
of renewable energy for power consumers remote from
the external electrical network is relevant. Here,
prospects are revealed in front of the solar PV stations.
One of the main functional units of solar power is
inverters that convert the DC voltage of the solar
panels into alternating current. The article describes
the advantages and disadvantages of the main methods
of voltage regulation of the autonomous inverters of
solar photovoltaic power plants. We have proposed
new structural designs of autonomous voltage
inverters, described their advantages, features of
design and operation for voltage stabilization. We
suggest stand-alone inverters designed using high
frequency link, which will significantly improve mass
and dimensions parameters of the converter. Due to the
use of single-phase transformer with a rotating
magnetic field in stand-alone inverters, we improve the
efficiency of the converter and the reliability of the
work. Patents of the Russian Federation confirmed the
novelty of technical solutions of the considered
schemes of autonomous voltage inverters. Structural
schematics of the voltage regulators considered in the
article, as well as features of their work, will allow to
increase efficiency of preliminary works on
development of autonomous voltage inverters with
improved operational and technical characteristics for
solar photovoltaic power plants