We have proposed the method for testing of independence of two alternative variables on the basis of statistics of non-numeric data. The method is aimed at application in problems of statistical quality
control. Testing of independence is based on set of small samples, i.e., in the Kolmogorov’s asymptotics, when the number of unknown
parameters of the distribution increases in proportion to the data size
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
Based on the theory of self-organization, we have developed an original method for identification of target functions students’ knowledge quality (SKQ) in the face of influencing factors uncertainty. The proposed system of external criteria for the models selection and control parameters allows to use the model for the effective management of the SKQ
The article presents results of the study of devices for
preparation of feed based on the relative helical drums.
In addition, we have created a method of calculation of
the drive, including motor power. We have given a
calculation sheet for relative helical drums of types of
5.1 and 3.1, as well as typical schemes of devices for
preparation of feed (feed-making machines) composed
of hollow equilateral triangular of hollow tetrahedrons
pyramids and hollow octahedra. The created method
of calculation of the drive was tested in the calculation
of power consumption of feed-making machines based
on spiral reels of 5.1 type mounted using hollow
tetrahedrons and spiral reels of 3.1 type, assembled
from hollow octahedra. It is shown that in the
calculation of the actuator, we should not only take
into account the mass loading of feed components, the
relative weight of the screw drum assembled with
wheels, for a symmetrical load location, but also a lot
of download components of feeds, arranged in a spiral
relative the drum asymmetrically to the axis of
rotation. Thus, summing up the power of the electric
motor, required for relative rotation of the screw drum
symmetrically loaded and also under asymmetric load
we define the motor power for the device for
preparation of feed, or feed-making machine
Metabolic products, water, dust and litter are released into the air and accumulated in the house when the birds are kept on the litter. The following techniques are available when caring for litter: a) cleaning, b) application of dehumidifiers, c) acceleration of decomposition by special microbiological preparations. The purpose of the experiments is to study the effect of a microbiological preparation in the litter on broiler productivity. Chickens “Cobb-500”, “Ross-308” and “Change-8” were up to 38-42 days old in special boxes. “Sunvit-K” and “Sunvit-K-forte” brought in the litter at the 21-, 28- and 38-day-old age of the bird. These biodestructors with bacteria have increased broiler productivity due to improved hygiene. The best effect was when applying to the litter “Sanvit-K” and “Sanvit-K-forte” at a dose of 20 and 10 g per square meter. м. The final weight of broilers increased by 3.8-5.3%, and EPEF is 346-348 units
The rapid pace of global scientific and technological
progress, which is the main engine of the economy,
demands for higher education, the purpose of which
is to prepare highly educated specialists – the
intellectual potential of Russia. It is known, that
technical and technological skills play an important
role in scientific and technical progress; ultimately,
the economic development of the country and the
welfare of the population depends on it. The
selection by the criterion of professional suitability is
the basis for building a decent contingent of firstyear
students of technical universities. The article
describes the disadvantages of the known and the
new method of selection, by qualifications, based on
the evaluation of the implementation of the students
tests on topics studied disciplines close to
engineering. The article reveals content of the main
stages of pre-University training in secondary
educational institutions. The proposed method of
selection based on professional suitability, and the
system of training of contingent in secondary schools
and colleges, created on the basis of higher
educational institutions, will significantly improve
the quality of training of specialists of technical and
technological directions for universities
The work considers the method of sketches or visual
notes which plays a basic role in the development of
training courses. We have focused on the method of
sketches as "a variety of visual notes, consisting of
handwritten text, drawings, diagrams, figurative
elements". For immersion of the student into the
subject area or object of study, the visualization of the
material is an effective technique of knowledge.
Cognitive function is manifested through the ability to
know the object by the image and the further formation
of ideas about the structure of the material being
studied. It is noted, that visual methods and
techniques are especially effective in the first stage of
researches. Then, there is the collection of material,
knowledge of the research object. Types of pumpkins
were the object of research, presented the works of
artists of different periods. The collection consists of
120 images that were collected in the period from 2012
to 2016. In the work, the attempt is made using the
method of visual notes and visual techniques to build
images of plants pumpkins which displayed in art
works of different centuries and interpreted as "a kind
of door" through which we can enter in our area
(introduction history of culture, archaeogenetic,
developmental biology, the history of selection)
The method of control of the amount of flow area of the supply nozzles in tape conveyor on a hovercraft is considered in the article. The local system that implements the principle of direct action to control the thickness of the air cushion is shown. Based on the hydrodynamic model, the formula for the engineering calculations of values of the moving devices are determined
The need of improving the grain drying technology is
due to a significant volume of this operation, high
specific energy and high standards to preserve quality
of grain. In this regard, the development of new
technologies and equipment aimed at reducing the cost
of fuel and electricity, providing the preservation of
grain quality has essential meaning to reduce the
drying cost. Usually, the electrophysical effects on the
dehydrated material not only contribute to the
thickness reduction or destruction of the boundary
layers and increase the surface of phase contact, i.e.
they cause the combined effects of the intensification
of the drying process that is economically favorable
and they say for a broader practical use of
electrotechnologies. Method of grain drying using
microwave recycling in installations of active aeration
bunker type allows increasing productivity compared
with standard technology for up to 30% and reducing
process energy consumption by 17%
The article represents the characteristics of different methods of air microbiological analysis on the basis of the results of patent searches, the aim of which is to identify and develop the most effective methods for microbiological evaluation of air quality in livestock buildings. This problem has particular relevance in the implementation of anti-epizootic measures. Among the studied methods of air microbiological analysis was used the new method which allows accurate counting degree of bacterial contamination, due to the additional coverage of molten and cooled to 45 ° C in culture medium, the density of which is not less than the density of the main medium. The new method for the microbiological analysis of air was developed and offered for practical application, including the sedimentation of aerosol particles and seeding microorganisms containing in the air at the surface of dense main medium, the temperature control of the samples and the count the microorganisms colonies number