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The features of the steady flow above an airfoil are as follow: being streamlined, drag reduction and lift increment.
Reduction, elimination, or control of vortex shedding has motivated considerable research in this area for several decades [32-37].
Fig. 2 Airfoil with positions of collecting data and two plasma actuators mounted on it.
In Figure 6, the data for the streamwise velocity component has been shown.
Due to the reduction in the amount of vortex shedding frequency, it can be concluded that plasma actuators are the cause of this reduction.

They allow increased control over tribological conditions and can help reduce the environmental impact of various processes through waste reduction and improved energy efficiency [1].
Metal and metal-oxide particles can be used to improve friction-reduction and anti-wear properties, while various sulphur compounds are used to improve anti-oxidation properties [3].
Mannekote et al. [2] list 10 different types of additives and the function of their application, which ranges from wear-reduction to viscosity index improvers.
[7] “Calcium carbonate ≥98,5 %, Ph.Eur., USP, BP, precipitated,” Carl Roth GmbH, Germany, Material Safety Data Sheet P013, Jan. 2021
[14] “Paraffin Liquid Light,” SciChem, Safety data sheet DSPA010, Jul. 2018.

In addition, the reduction of deposition thickness after annealing is not explained in literature.
The mechanism of reduction of ZnO layers’ thickness after annealing also discussed based on the findings in this work.
The increase of O at. % in Fig. 4 (EDX) with pro-long annealing indirectly indicates the reduction of oxygen vacancies in ZnO layers.
Since oxygen vacancies were the main source of electrons for charges transportation, the reduction of oxygen vacancies in ZnO layers would increase the sheet resistance after pro-long annealing.
Research Data Policy and Data Availability Statements The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

In order to realize energy-saving and emission-reduction, there have been some new ventilation technology, for instance, the improved ventilation device, the improved ventilation method, and some new ventilation control technology.
Aim to the object to be evaluated, it can be expressed in formula 3 with the indicator data

The computer simulation results show that the proposed algorithm is superior to the traditional Wiener method in the low CPU cost, real-time statistics, the reduction of the speech distortion and residual musical noise.
Experimental results We select a piece of single channel data as pure speech which is saved as 1.wav The speech signal is sampled at 8 kHz and quantified with 16 bits.

A degree of the effect of the light flux characteristics and Fresnel lens geometrical imperfections on validity of the experimental data interpretation has been examined.
The lens chromatic aberration (CA) hinders to satisfaction of this requirement, which, at the wide sunlight spectral range and the finite Sun angular dimension, results in the essential “smearing out” the concentrated radiation in the plane of the SC location and in reduction of the irradiance level on SC due to special and spectral sunlight energy redistribution.
The prospect to use a FL with the curved operating facet generating lines and with the increased profile pitch opens additional feasibilities for fabricating glass FLs (for-example, injection molding technique), which will result in reduction of the lens cost at simultaneous achievement of the higher power efficiency compared to those of the lenses with straight generating lines.
The main material characteristics used as initial data are presented in Table 1, and the calculation results − in Fig. 1.
The main results of the carried out investigations are: - mathematical model based on power ray tracing has been developed for optimizing the FL profile parameters and calculating lens optical-power characteristics with allowing for technological peculiarities of lens manufacture; - the advantageous of lenses with curvilinear operating facets in saving higher concentrating capability in increasing of Fresnel profile step owing to the reduction of losses on the tooth tops and valleys roundings have been demonstrated in comparison with conventional Fresnel lenses with conical operating facets; - the procedure for searching the optimal optical material for lens manufacturing have been presented; - an experimental OPCs have been obtained indoors for developed lens specimens with use of specially designed optical bench; - a good agreement between the measured and simulated data was obtained;on the bases of the experimental results, correction of the calculation model of the concentration

Experimental data were approximated, and model parameters for specific materials were determined.
The logarithm process converts the expression into a linear form (4) The use of the least squares method allows us to find the diffusion indices in an explicit form using the data in Fig. 1.
(7) This equation allows for a reduction in order.
The first derivative will then act as the desired function f and the equation will be rewritten as (8) After reduction and separation of variables, the equation allows a solution in the form , (9) where K is the integration constant This equation can be solved in the form (10) The integration constants must be found from the boundary conditions.

The main thermodynamic functions were calculated from the data of gas chromatographic analysis.
The obtained data indicate a decrease in the total content of macro and microelements and a decrease in the resistance of wood species to formaldehyde in the series birch → oak → pine → larch.
The amount of water sorption on studied sorbents, obtained experimentally and using equation TOSM (Kind = 453 K) Sorbent Adsorption, mmol/ g experimental data data calculated from the equation TOSM К95 2,34±0,6 2,22±0,7 М95 2,23±0,7 2,11±0,9 М45К20 2,14±0,8 1,95±0,7 The coefficient of internal diffusion of water molecules is determined by the Znamensky equation , where F is the degree of filling of the sorbent tank, t is the time to reach the degree of filling of the sorbent tank, r is the radius of the grain.
The data obtained are presented in table 4. [8] Table 4.
Therefore, based on the analysis of the data obtained and presented in Chapter 4, a technological solution has been developed to reduce the concentration of formaldehyde in the environment.

These design characteristics, including the data related to various mechanical properties of PCM strength, are determined by statistical processing of the experimental data.
When the fragment is separated along non-parallel planes (most often, this is a tear), tensile failure is added to shear failure and interpretation of the experimental data in this case is not clear.
Diagram for determination of shearing strength Experimental data show that PCM shearing strength along the grain t0,90 exceeds the strength across the grain t90,0 [25, 26] several times.
Consequently, the proposed multi-purpose specimen and reconfigurable equipment allow to provide the data for studying anisotropy of PCM shearing strength in mechanical joints of parts at minimal cost. 1 Fig. 4.
Based on the resulting data, the following dependence is found , (3) where – volume content of stopper fibers.

Without separate pilot inserted into the OFDM data, the data stream is divided into blocks of length N and modulated by IFFT matrix
In the ith OFDM symbol, the ith OFDM data block and the ith OFDM data frame are defined respectively as: (4) where includes the OFDM symbol and the guard interval and in the back and front, which satisfies in the proposed model.
If the CIR is obtained by estimation, one-tap frequency-domain equalizer can be used to get the transmitted data.
The frequency-domain response of OFDM data blockbecomes after P points FFT.
Combined channel estimation and PAPR reduction technique for MIMO-OFDM systems with null subcarriers[J].