One of the important issues in the design of static
converters of electric power, i.e. rectifiers and
inverters, is to calculate the parameters of the output
and the input filters. Output filters are designed to
improve the quality of output voltage of inverters, and
input filters are created to reduce ripple of the input
voltage of the converter that occur when commuting
power semiconductor devices, and smoothing
fluctuations of the current consumed from the power
supply. The complexity of analytical description of
the harmonic composition of the output and the input
of the voltage rectifiers and inverters makes it
difficult to develop some accurate methods for
calculating the parameters of their filters. At the same
time, considering the discreteness of the number of
possible parameters of real elements of the filter, the
practical value of such techniques with a high analysis
accuracy of the harmonic components is negligible. In
this article, we suggest the technique of the simplified
calculation of output and input filters for passive LC
filters rectifiers and inverters. At the same time, the
practice of mathematical modeling and design of
transducers has shown that the calculations of the
filter parameters for rectifiers and inverters are not
significantly different from each other. Therefore, the
analytical expressions for calculation of the filter
parameters of rectifier used ripple coefficient, and if
necessary the calculation of the filters of the inverter,
instead of the pulse number in the formula can be
substituted with the value of the harmonic; in
addition, we have also taken into account the value of
the load power factor
Fruits are an important part of the diet of humans and
many animals. In case of an improperly organized
process of storing of fruits, the loss of mass and
decrease of quality can be substantial. This makes
relevant the research, aimed at enhancing existing and
developing new technologies of fruits storing. In this
article, the results of the investigation of influence of
complex treatment of fruits with electromagnetic fields
of extremely low frequency (EMF ELF) and а biopreparation
on the change of microbial contamination
of their surface and on the loss of mass in the process
of long-term storage are revealed. Apples of the Idared
variety and pears of the Conference variety were the
objects of research. The change of microbial
contamination of the surface of fruits, undergone a few
types of pre-treatment (EMP ELF, bio-preparation
“Vitaplan”, complex treatment “EMP ELF + the biopreparation”
and no special treatment), after storing during 7 months in case of pears and 8 months in case
of apples is shown in the article. It was found, that the
greatest decrease of content of microorganisms on the
fruits’ surface is achieved as a result of the complex
treatment, combining the treatment with EMP ELF and
an aqueous solution of the “Vitaplan” bio-preparation.
The effective parameters of such a treatment for apples
and pears are represented
This article provides results of studying the world
achievements in modeling social systems in the
aspects of personality, group, and social institute (e.g.
the state and army). Through prism of conflict, we
review research methodology for modeling social
identity, social navigation, geopolitical processes, and
command and control systems of the enemy. We
discuss four agent-based models of social identity:
SCIPR, MetaContrast, PS-I, and SILAS. We examine
Spence model for modeling social navigation. Basic
principles for modeling relations between the states
are considered using ontology approach. The
presented model allows systemic analysis of various
micro- (intrastate) and macrolevel (external) variables
and relations between them. Modeling command and
control system of the enemy is implemented as a part
of an automated decision support system that tackles
the problems of enemy structure identification as well
as classification of objects and relations within the
structures. The object of study are approaches,
methods and models for representation and analysis of
group interaction. The subject of study are processes
of agent self-identification and interaction, formal and
informal organizations, the states and public institutes
as well as processes and principles for group
formation and mechanisms for behavior control.
Research methodology: social network analysis,
ontology approach, theory of graphs and hypergraphs,
multiagent systems
During an era of rapid development of society and all
areas of its activity, special attention should be paid to
a condition of the objects considerably simplifying
humans’ life. The car, which began to be an integral
part of each family, is among such objects. But
sometimes, the car can get into accident and then some
malfunctions appear. For their elimination, motorists
address to the specialized organizations for car repairs.
The article is devoted to introduction of information
technologies to the sphere of rescue and recovery
operations of a body of the car. Today, a necessary
condition of advance in the sphere of information
technologies is widespread introduction of standards
and technologies of the information systems used both
for hardware, and for software products. In this study,
the efficiency of application of the complex of
hardware (CH) by means of which achievement of
improvement of quality of rescue and recovery
operations, through a possibility of comparison of the
damaged detail with its factory model and a possibility
of quality check of the end result will be considered.
The set of methods and techniques of the organization
of information processes in the production systems
allowing carrying out the choice and use of necessary
information technical solution for synthesis of
knowledge of a production situation makes contents of
the concept of formation of information resource of a
control system of the knowledge-intensive production
The article explores the distinctive features of project
management in the field of information technologies in
general and in system integration in particular. We
have analyzed and explored the success of project
management cases in global practice of project
management in information technologies, explored the
criteria of success in projects and its evolution
throughout the history. The article also investigates the
main problems and risks in project realization and
identifies the factors, causing the negative effect on
project management. We have explored the
interconnections between the identified problems and
the lifecycle of the project and the fundamental
features of the project management. We have also paid
attention to the role of the project manager and the
importance of his contribution to the project. We have
worked out a set of measures entitled to minimize the
identified risks and to increase the success of project
management in information technologies and system
integration
Due to the recommendation of the World Health
Organization, the standard rate of vegetables
consumption for a person per year is 130-150 kg,
including up to 15 kg of fresh production during the
off-season. To meet these standards in Russia, the
construction of greenhouses and greenhouse
complexes was sped up. To cultivate the bulk of
vegetables in the conditions of protected soil we have
mostly used winter greenhouses. At the same time, in
terms of the climatic conditions, the main production
costs are accounted for energy carriers (up to 60 –
70%). The main consumers of energy in greenhouses
are plants’ lighting and creation of the required
temperature conditions for plants and soil. Annual
increase of rates for energy carriers affects the cost of
the greenhouses’ production. To increase the energy
efficiency and independence in greenhouse complexes,
it is proposed to use installations based on gas
reciprocating units (GRU) for the production of two
types of energy – electric and thermal. Such
installations can run on the natural gas and other types
of fuel. The drawback of existing installations is that
they are mainly produced abroad or consist of the
foreign components. As an alternative, we offer new
technical solutions, which were developed and
patented in the Russian Federation. What makes these
solutions original is that asynchronous generators in
the installations are used with various control schemes
Now in different branches of the industry there is a need for the new equipment and mechanisms with the seized characteristics. Special requirements are shown to energetic and mass-dimensional indices of systems of electric drives as one of the main components of such devices. Mass-dimensional and energetic indices due to constructional features and the used management system will allow improving use of special or controlled asynchronous cascade systems of an electric actuator of cylindrical construction. One of the main difficulties is simulation and design of special systems of the electric drive. In this article, a new approach to determination of magnetic model parameters of the stator of a component of the controlled asynchronous cascade electrical drive of cylindrical construction is offered
The transportation process plays an important role in the
delivery of agricultural products to the consumer. On
how well the fruits are preserved, their grade will
depend, and, consequently, the price of them. It is
known, that the annual damage from losses of
agricultural products in the agro-industrial complex
amounts to 8 billion rubles, according to various
estimates. A large number of different factors affect the
safety of fruits during transportation: temperature,
humidity, smoothness of the vehicle, type of container,
etc. The more factors will have a negative impact on
fruit and vegetable products, the more losses will
ultimately be. The appearance of dents and abrasions on
the fruits gives rise to the formation of foci of rot,
leading to damage to the transported products, and, as a
consequence, reducing the grade. In order to reduce the
losses of fruit and vegetable products in the process of
transportation, the USSR and the Russian Federation
have been and are working on the creation of containers
and ways of transporting pomegranates. All of them, according to the authors, are able to reduce the dynamic
loads that arise during the transportation process and
have a negative impact on the transported products.
However, due to various circumstances in commercial
gardening all these developments have not been
extended
The article considers the current state of production
of grain crops in the Republic of Sakha (Yakutia).
The analysis of gross collection, structural shifts,
sowing area and yield of grain crops over the past
five years is being carried out. Also, the application
of mineral and organic fertilizers to crops of cereals
is being investigated, since their application is of
great importance for obtaining high and stable
harvests of grain crops. Based on the results of the
analysis, conclusions were drawn and ways of
development of grain production in the republic were
outlined
Lodging resistant is a very important factor of limitation of the yield of barley. The yield of lodged crops may be decreased up to 50%. The quality of the yield also deteriorates which negatively affects brewery characteristics. The lodging resistance of a variety is determined genetically and depends on a plant height and weather conditions during dynamic vegetation. One of the main aims of breeding of the crop for lodging resistance is the selection of short-stem varieties. However, a thorough study of the basic material and determination of its adaptability to a particular soil and climatic zone and suitability of its usage as parental forms are needed. The article covers the plant height of collection varieties of winter barley in the central zone of Krasnodar region and determines the groups of the varieties based on this trait. The dynamic of plant height formation depending on the vegetative conditions during five years is studied. The examination of lodging resistance of winter barley revealed that there are many non-lodging forms of the crop. New local varieties and lines have short and strong culms. Also, some varieties from Western Europe and the USA show its good lodging resistance under these conditions