To determine the feasibility of using PV systems we
should assess the economic efficiency of wind energy
in the region. At the same time, the first step should be
an analysis of upper-air and power characteristics of
the wind. The next stage is to determine the energy
source of wind power (theoretical, technical and
economic potential). The basic approach to the
calculation of economic indicators should include a
determination of the effectiveness of wind power
installations in competition with traditional energy
sources in a particular region. There are important
following indicators: the payback period and economic
efficiency. If the economic potential of wind power
satisfies the requirements, the next step is to study the
technical requirements applicable to wind power
stations. For a preliminary assessment of the terrain,
the article discloses a sequence of events that must be
performed to assess the effectiveness of the installation
of wind power systems. We have listed advantages and
disadvantages of the main types of wind power plants,
and other ramifications of choosing of basic functional
units. The considered in an article analytical
expressions for calculating the evaluation of economic
efficiency of wind energy, the technical requirements
for the basic parameters of wind turbines and their
main advantages, disadvantages and features the work
will allow at the design stage to carry out a preliminary
assessment of effectiveness of the wind power stations
for a particular region and locality, specific types
consumers in view of their modes of operation and the
quality requirements of electricity
The task of nonparametric identification of sequence
objects with discrete-continuous nature of the process
under nonparametric uncertainty, i.e. in conditions
where a priori information is not sufficient for an
informed choice of a model structure up to
parameters is considered. Among series-connected
objects, there can be objects both dynamic and
instantaneous ones with a lag. This kind of
technological chains is common in various industries,
particularly in metal, power, oil refining, etc. in
solving this problem were used methods of
nonparametric identification theory, mathematical
statistics and statistical modeling. The theory of nonparametric
systems is based on local approximation
methods, in particular algorithms for nonparametric
estimation of different kind of dependency from
observation of input-output variables of the object.
The article presents a nonparametric model for the
group of spinning objects with delay. In the work we
show in detail the results of numerical studies
showing that the use of nonparametric algorithms
allows predicting process performance with sufficient
accuracy
The ways and the methods of the solution of the problem of complex cleaning of grain crops were proved; the de-pendences of engine capacity of the Massey Ferguson tractors of 8200 series on the capacity of a thresher of the hook-on combine were received
This article discusses the application of the method of selective transfer to restore the plunger pairs of high pressure fuel pumps of diesel engines. To restore plunger pairs the authors of the article propose to use an anti-friction repair-and-renewal composition on the basis of the mineral serpentinite
The article investigates the possible pathways for the
formation of crotonaldehyde in wine production in the
result of the activity of wine yeast and lactic acid bacteria. It established that exposure to exhaust gases, noble rot, pathogens and pests on grape plant does not lead to the biosynthesis of crotonaldehyde in grape berry. The experimental data to identify probable pathways for the formation of crotonaldehyde during vinification has been presented. The effect of the test substance on the life of yeasts and lactic acid bacteria has been estimated
This article discusses the basic analytical expressions for calculation the energy potential and cost-effectiveness of wind energy
The work is scientific and practical in nature, same as
the discussed process of optimization of power losses
in power networks based on the use of the
transportation problem, namely the rules of the
minimum element of the transport matrix, which is a
valid solution. The mechanism of the improvement of
the obtained feasible solutions to the tasks focuses on
using the potential method, assigning each row and
column of the matrix their corresponding potential.
Using a basic variable and manipulating the elements
of the transport matrix according to a specific
algorithm, we implement the construction of a new
support plan. Based on the plan and its acyclic, we
build two cycles and determine the values of the
estimates between direct and indirect transportation costs per unit of output. The resulting algorithm makes
it easy to program all computational operations and
quickly obtain the result of the optimization of power
losses in the design of the electricity network, thereby
reducing the economic and technological costs. As a
result of joint use of transportation problems and
potential method, we could find the optimal solution
based on improved solutions more efficiently, and a
scheme of optimal electric network. As consumers, in
practice, there may be urban and agricultural,
industrial enterprises, regional and district
subordination, including industrial, agricultural and
individual customers
The technology of cultivation of most crops provides pre - and post-emergence weeding of crops, and their feeding with the availability of soil nutrients. According to the used underlying technology, these operations are performed separately. The harrowing of crops after germination is necessary for weed control, the destruction of the soil crust for access of air to the root system and partial thinning of dense crops. Further destruction of weeds on crops are herbicides, high-quality entry which provide sprays. The latter can provide small and ultra-low volume spraying in high performance and environmental requirements. However, separate execution of technological operations for fertilizing and harrowing reduces the quality of work, increases the cost of production. The proposed combination of technological operations on a harrowing of crops different crops simultaneously with feeding plants solid mineral fertilizers. The combination of technological operations for one pass of machine-tractor unit in the field provides a reduction of the fleet, its capital intensity, the energy, cash costs, and hence competitiveness of products. The studies proposed new technical support processes, technological scheme of the multifunctional unit to combine the operations of feeding and harrowing of crops
In this article, we have presented the study and
implementation of the physical model of
motion of two coupled pendulums with use of
numerical methods. When building the model
we were using the method of Euler solutions of
differential equations, which displays
pendulums visual motion, as well as building
graphics of functions of speed, angle and
acceleration depending on time with high
reliability. We have generated equation of
motion for generalized coordinates for the first
and second mathematical pendulum. The
generated application implements a physical
model of a double mathematical pendulum,
commit sustained oscillations with the ability
to change the basic parameters: deflection
angle, speed, mass and length of the rod in C++
language by programming environment
“Embarcadero RAD Studio”. This application
can be used as a model of a double
mathematical pendulum in the study of
oscillations, as a methodical manual and a
virtual laboratory in physics, informatics and
programming classes – for demonstration,
study and create applications in the objectoriented
C++ programming language
It is shown that for preparation of the concentrated forages it is expedient to use the vibration principle of mixing with use of big amplitudes of movements of components of forages from 10 to 500 mm. and more which can be done when using relative screw drums at the expense of the flat or curvilinear elements which are discretely located on perimeter of a relative screw drum placed on perimeter at an angle not only to an axis of rotation of a relative screw drum, but also to each other, the difficult spatial movement with a big amplitude of movements from 10 to 500 mm is reported to particles of components of forages. Possibility of creation of resource-saving technologies and the equipment for mixing of components of forages is shown. Earlier it was limited to low intensity of the proceeding processes and localization in a limited zone, and also small sizes of amplitudes of fluctuations in known designs. In the offered designs of the equipment for mixing of components of forages the movement of particles of components of forages is provided with an original design of working bodies – the relative screw drums making only a rotary motion round own axis. The difficult spatial movement with a big amplitude from 10 to 500 mm and more, is reported to particles of components of forages by walls of a relative screw drum of various standard sizes and configurations which becomes complicated screw lines and screw surfaces directed towards to each other on perimeter of a screw drum therefore process duration ranging from 1,5 min. till 1.75 min. is sufficient for high-quality mixing of particles of components of forages in a relative screw drum