Nowadays the method of finite elements (MFE) is a
standard method of acoustic analysis. It consists in
finding the solution of the function on the maximum
allowable quantity of piecewise continuous functions
that are determined in allowed number of subdomains.
The number of sub-domains has a finite
value but an unknown continuous value is
approximated by the polynomial on each element that
acquires specific values in the nodes. Polynomials can
be various but all of them produce continuity of total
value along its limits. Herewith because of technical
features of the calculation process minimization of
numbers of polynomials is required according to the
criterion of acceptable precision. In the chosen
COMSOL Multiphysics program model the range of
frequencies under analysis is the result of the sum of
10 segments (sub-ranges). Such a sub-range is a
minimal discrete value in certain conditions of
calculation. Thus, the calculated value on this subrange
can be considered as the result of calculation by
means of using the band-pass filter with 35 Hz
bandwidth. Because of this, we can draw a conclusion
about changing the state change of the noise exposure
on the combine operator with respect to the previous
measurement according to the regulatory
methodology. Hereinafter if the stated change of the
noise exposure is found, measurements that are more
precise are taken. On the basis of these measurements
the head of the company receives recommendations
either on verification of stated acoustic characteristics
of devices and mechanisms of a harvester or on
verification of acoustic ways of transmission of
structural noise (noise created by devices that
penetrates into the booth through the combine body),
or on verification of noise isolation of the booth
The article considers the method of comparison of radiation sources for plant growing by photosynthetic energy units or analogs costs, evaluation of critical values photosynthetic active radiation efficiency at which light-emitting diodes comparable by photosynthetic energy unit's costs with the most common alternative sources for irradiation of plants – high pressure sodium lamps
This research is aimed to evaluate the prebiotic potential of lactitol and chitosan succinate using the vitro fermentation model. Four substrates (raftilos, lactitol, cellulose, chitosan succinate) were tested in vitro, using Batch culture fermentation method with fermentation of mixed human faecal microflora . Measurement of prebiotic effect (MPE) values were generated comparing bacterial changes through determination of maximum growth rates of groups, rate of substrate assimilation and production of lactate and short chain fatty acids. The present study applied the MPE theory to evaluate the in vitro prebiotic potential of substrates as novel prebiotics
In the article we present the results of the researches of the influence of low temperatures on the quality of citrus pectin. Comparing the information before and after freezing shows that qualitative indicators are decreasing, but only slightly
In recent decades, Russia has increased the demand for
high oleic sunflower oil and, consequently, for the raw
material from which it is derived – high oleic sunflower
seeds. Currently existing methods of control of mass
fraction of oleic acid in the seed oil of sunflower, have
significant drawbacks, due to which sharply raises the
question of the development of the Express methods of
control of mass fraction of oleic acid. The study presents
the results of determining the mass fraction of oleic acid
in the oil of sunflower seeds, obtained by known
methods (GC and ri), and developed a method based on
NMR. The developed method of determining the mass
fraction of oleic acid in sunflower seed oil has a number
of advantages compared with the known: is not
destructive (does not require the extraction of oil from
seeds), does not require special sample preparation
excludes the use of toxic chemicals, the analysis duration is 5 minutes, ensuring high representativeness of the
sample, and the simplicity and automation of the analysis
process reduces the requirements for qualifications of
laboratory personnel. The developed method of
determining the mass fraction of oleic acid in the oil of
sunflower seeds can be carried out simultaneously with
the determination of oil and moisture content of seeds on
commercially available analyzers, but I hope it 1006М,
which is currently applied at more than 250 companies of
oil and fat industry
The article presents the comparative characteristics of
the current (diffusion) and developed (diffusion-press)
sucrose extraction technology from sugar beet
cossettes. We have presented the graphs of the
influence of raw juice pumping value on its cleanliness
and residual content of sucrose in partially desugared
beet cossetes, the influence of partially desugared beet
cossetes pressing power on residual content of sucrose
in the pressed pulp and losses of sucrose with pressed
pulp and also the technological scheme and regimes of
diffusion-press extraction of sucrose from sugar beet
cossettes. The criteria for determining the boundary
parameters of diffusion and press sucrose extraction
stages are identified. The comparative assessment of
technological and economic indicators of the existing
and the developed technologies of sucrose extraction
from the beet cossettes is shown. The developed
technology allows reducing raw juice pumping value
simultaneously increasing its purity, thereby providing
reduction of auxiliary materials and energy resources
consumption, as well as increasing sugar yield. The
technology of diffusion-press extraction of sucrose is
implemented on 2 sugar beet factories of the Russian
Federation. The economic effect from its
implementation is more than 45 mln. rubles
The article presents a comparative assessment and
peculiarities of nuclear magnetic relaxation
characteristics of rapeseed and sunflower lecithin. It
was established, that lecithin’s nuclear magnetic
relaxation characteristics, namely, protons’ spin-spin
relaxation time and amplitudes of nuclear magnetic
relaxation signals of lecithin components, depend on
content of oil’s fat acids and phospholipids, contained
in the lecithin. Comparative assessment of protons’
spin-spin relaxation time of rapeseed and sunflower
lecithin components showed, that for their
identification protons’ spin-spin relaxation time of the
lecithin’ first component at 40°C and 60°C
temperature, when differences in values of protons’
spin-spin relaxation time of the sunflower and
rapeseed lecithin’ first component are most obvious,
should be used as an analytical parameter.
Comparative assessment of amplitudes of proton’s
NMR signals of sunflower and rapeseed lecithin
components showed, that relations, established earlier
for sunflower lecithin between mass share of
phospholipids (substances insoluble in acetone) and
the sum of amplitudes of proton’s NMR signals of the
third and fourth components, cannot be applied to
rapeseed lecithin; that is for the development of an
express method for determination of mass share of
substances insoluble in acetone (phospholipids) in
rapeseed lecithin, it is necessary to carry out additional
research with the purpose of clarifying the mentioned
relations
In the article we have performed a comparative analysis
of a traditional system of air supply to the bioreactor
during the composting process and the developed system
with lateral air supply. We have proven to reduce
temperature variation of the substrate as a result of the
use of the ventilation system by 35%. During the
simulation, equal to 1.0 hour, a ventilation system with
side air flow provides a reduction of the accumulated
degree of heterogeneity of status parameters of the
substrate by 58%. Use of the ventilation system with side
air flow reduces the duration of technological cycle of
composting 7 %. 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 administration of the
Krasnodar region
This article is devoted to the problem of network
attacks recognition, which is essential for providing
network security. A research of neural network
efficiency has been held. Such metaeuristic
algorithms as genetic algorithm, gray wolf
algorithm and firefly algorithm have been applied
for the neural network learning. The algorithms’
fundamentals have been described. Multilayer
perseptrone with sigmoid activation function has
been selected for the task of network attack
presence check. Various configurations of the
neural network have been tested in order to find the
optimal number of layers and neurons per layer,
which ensure the least error. Learning has been
performed by minimization of the average squared
error between the network’s output and its target
value with the help of the listed algorithms. Genetic
algorithm requires accurate parameter picking in
case of any network’s architecture alteration.
Moreover, it is not as fast as firefly and gray wolf
algorithms. Gray wolf algorithm appears to be the
most effective one. However, it loses its efficiency
if the number of layers is increased. Firefly
algorithm proves to be the most universal one.
Although it is less effective than gray wolf
algorithm, it provides the most exact output even if
the network’s structure is changed
In the article we consider the questions of modeling of
temperature changes in the composting process, the
changes of oxygen concentration and temperature with
the air from the environment, produced the effect of
composting heat exchange mass with the environment,
the selected state variables and the control bioreactor, the
dependence of the coefficients of the system equations of
motion from the variable state of the object. 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