The process of interaction of the grain particle with the rotor blade is considered. The factors, which influence the tension size in the grain particle at blow about the blade are revealed. The ways of the tension reduction in the grain particle at blow are offered
The article considers the problems of determining the
settings area of the control device, which ensure stable
operation of the closed system. It shows the solution to
the problem using the enhanced amplitude-phase characteristics.
The proposed method of finding the domain
of stability of parameters of the control device is
more simple than classical methods and allows, in
general, to find conditions for the stability, not to test
the system for stability under given parameters
The article proposes the updated model of the influence of logs length onto a size of wooden chips produced with the use of a disk chipper. This article focuses on the fact that the length of any of the logs in the process of chipping is reduced. For this reason at the final stage of chipping, any of the logs with a standard initial length of 1.2 m inevitably transform into short logs, for which the conditions of chipping are significantly different from the chipping conditions at the start of chipping. The task of accounting for these changes is reduced to finding a solution of the transcendental equation. The results of numerical simulation indicate a progressing decreasing trend in the bevel angle and increasing in the length of the particles of wood chips with decreasing of logs length. Adequacy of the modeling results confirmed by laboratory tests and production experiment. Measuring linear and angular dimensions of chip real particles showed that the particles of such length may be equal to 7 cm, which is 3.5 times larger than the standard length of 2 cm. The angle of the bevel of the cutting plane of the particle may be 14º, which is approximately three times less of standard value equal 39º- 43º. We also discuss the comparison with the approximate solution, which was published in 2012 year. The article can be useful for specialists of wood-preparatory cycle in the paper industry
In this article we consider the usage of HRU access matrix changing system allowing for information security system which makes mandatory access control in case of information security analysis by
using an automatic classification of formalized documents in the system of electronic document management
In the current economic situation, the
developing of cattle breeding is taking on
special significance. It is well known that the
effective way to develop cattle breeding is to
increase the total number of efficient livestock.
The numerous researches show that the high
concentrated fodder premix diet gives the
highest effect in increasing animal indicators [1,
2, 3]. Traditionally, the premix is a powder
mass, which should be added into the mixture
of grain components. Exact following the recipe
of prepared fodder allows the maximum usage
of forage potential of the concentrate
components [4, 5, 6, 7]. In view of the
foregoing, food enrichers have special actuality
in making high concentrated fodder [8, 9, 10].
The usage of differential Fokker – Planck
equation systems allows determining the laws
of the mixing process of various granulated
products. As a result, it becomes possible to
optimize the technological process of the mixerenrichers
of concentrated feed so that the
resulting mixture of feed would have high
quality and technological characteristics. At the
same time the duration of sewer-enricher’s
work and, as a consequence, the energy
intensity of the technological process would
accept the minimum possible values [11-16].
The given theoretical approach is based on the
consideration of the motion of an individual
particle contained in a loose grain mass (phase).
Concerning this, it is necessary to accept a
number of assumptions about making effort to
the feed particles, and the velocity vectors of its
initial motion should be taken into account.
Taking into account the complexity of the
mathematically derived differential equation, its
literal analytical solution seems very difficult.
Therefore, the first step of the solution is aimed at the obtaining the non-stationary diffusion
equation of Fokker - Planck and the boundary
conditions for isolating the only one solution.
The second step of the solution is implemented
by the tabulation at the grid-based points, that
is, considering the differential equation not at a
random point of the area, but only at the grid
nodes. Moreover, it is necessary to apply the
approximation of the derivatives at each node.
The solution of the equation system allows
determining the module of the minimum,
average, and maximum values of the phase
particle motion in different parts of the mixing
chamber, respectively. In connection with this,
the aim of the study is to substantiate the
processes of motion of various types of
granulated products
The article presents possible ways of using the juvenile
wood in wooden structures with taking into account
the experimental research of its physical and mechanical properties. Experimental research aimed at defining the possibility of its use in construction materials
In the present article, a technique for studying the
influence of the parameters of a drying plant on the
optimization criteria is described. The design of a
laboratory plant for drying bee-bread is presented. An
adequate empirical dependence of the effect of the
parameters of the process under study on the residual
moisture of bee-bread is established. An optimal
combination of factors has been revealed, which
makes it possible to minimize the residual moisture
of bee-bread
The article studies dynamics of losses and the change
of composition of essential oil from split coriander
fruits. It is found, that in the fractions of split fruits,
extracted from long-stored commercial lots of raw
materials, mass fraction of essential oil is two or three
times lower than in whole fruits. In the composition of
essential oil from split fruits the content of valuable
components - linalool, geraniol, geranyl acetate is
slightly higher, and the content of undesirable
hydrocarbons and camphor is lower. It is shown that
from freshly split fruits, which were stored in a thin
layer in the open air, the oil was intensively lost in the
first three days, the losses reached 86 %. At the same
time, the composition of the oil changed: the content
of most volatile components - hydrocarbons decreased
several times and the content of high-boiling linalool,
geraniol, geranyl acetate significantly increased, which
increased the quality of the oil smell. The change of
composition is determined not only by the ratio of
components volatility. The content of relatively high
boiling camphor almost half decreased. This could be
associated with less ability of fruit tissue to sorb and
the ability of camphor to be easily sublimated.
The content of volatile n-cymene over time increased
with a simultaneous decrease in the content of γ–
terpinene, which confirmed predominantly chemical
way of n-cymene accumulation in coriander essential
oil in conditions conducive to oxidation. It is
recommended to separate the split fruits as soon as the
raw materials come to the plant and to process
immediately. Essential oil from split fruits can be used
to adjust the composition of individual lots of oil in
order to improve their quality, and to provide
extraction of valuable components – linalool and geraniol by vacuum rectification method
In the article, the results of the theoretical and experimental researches of working part for sheet division and orientation of tobacco leaves by preparation to their drying are presented. There is an efficiency of its use, received by results of departmental tests
The article gives the results of the theoretical and laboratory investigation of the improved lump destroying operating element in order to find the optimal parameter of the machining gap when the highest effectiveness of the device work is achieved