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In general, the low values for corrosion rate, and the high values of polarization resistance obtained experimentally for carbonitrided CP-Ti in Ringer’s solution, imply that this material has the potential to be considered as a biomaterial.
Acknowledgment This research was financially supported by the Russian Science Foundation (Contract No 15-19-20027) to the Nekrasov Kostroma State University.
Wu, Study of plasma electrolytic nitrocarburizing on surface of titanium alloy, Materials review (04) (2008). http://en.cnki.com.cn/Article_en/CJFDTOTAL-CLDB200804037.htm [3] Y.
Belkin, Plasma Electrolytic Modification of the VT1–0 Titanium Alloy Surface, Journal of Surface Investigation.

Theoretical Study on CO2/SO2 Absorption Using N-Alkylethylenediaminium Protic Ionic Liquid Hui Huang1,a, Er Hua1,2,3,b* 1Chemical Science and Engineering College, China 2Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, including country 3Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, 204 Wenchang North Street, Xixia District, Yinchuan, Ningxia, 750021, China.
Supplementary Material See Supporting Information for the complete original vibrational frequency, charge distribution, second-order perturbation stabilization energy, and electron density data.
Acknowledgements This work was financially supported by the Natural Science Foundation of the Ningxia Hui Autonomous Region (Project Number: 2021AAC03181), the Graduate Innovation Program of North Minzu University (Project Number: YCX21134) and the Scientific Research Foundation for Returned Scholars of Ministry of Education (Project Number: [2013] No. 693).
Hua, Hydrogen bonding study on protic ionic liquids composed of N-alkylethylenediaminium cations with bis(trifluoromethylsulfonyl)imideanion, Journal of Shihezi University (Natural Science). 38 (5) (2020) 540-547

(2) To guide the enterprises for clearer production with government regulations It is better that not to pollute than to improve with large amount of manpower and material resources after pollution.
References [1] The Sustainable Development Research Committee of Chinese Academy of Science.
Beijing: Science Press, 1999
Journal of China University of Petroleum (Edition of Social Sciences) 2012, 28(6) 39-43 [14] State General Administration of the People's Republic of China for Quality Supervision and Inspection and Quarantine, Standardization Administration of the People's Republic of China.

The photocatalyst material and structure are the most important factors in the photocatalysis process.
The semiconductors such as TiO2, SnO2, and ZnO, are widely used in the photocatalysis field because of their availability, low cost, low hazard, and effectiveness, which can be improved greatly by producing these materials at the nanoscale [7-10].
Arabian Journal of Chemistry, 15 (2021) 103180
Applied Surface Science, 448 (2018) 646-654

Quantification of the ferrite grain size refinement promoted by vanadium enhancing allotriomorphic nucleation (grain boundary, g.b.) and intragranular nucleation (intra) Conclusions - The addition of small quantities of vanadium to low carbon structural steels produce a refinement in the final ferrite microstructure compared to the plain carbon material.
Hutchinson: Scandinavian Journal of Metallurgy Vol. 28 (1999), p.186 [14] R.
Rhines, McGraw-Hill Series in Materials Science and Engineering, New York (1968), p. 129 [15] D.

Nanotechnology can be defined as science related to tiny matters with the size of 1-100 nm.
The properties of nanotechnology are different from the original material and can manipulate data on an atomic scale [3].
The magnetic sensitivity of MnFe2O4 nanoparticle is higher than other ferrite materials such as Fe2O4, CoFe2O4, and NiFe2O4.
Wongwises, “International Journal of Heat and Mass Transfer Heat transfer enhancement and pressure drop characteristics of TiO2 – water nanofluid in a double-tube counter flow heat exchanger,” Int.

Introduction Amber is the mixture of organic materials which is formed from the resins of conifers from Cretaceous Period in Mesozoic to the third century in Cenozoic and the legumes, through complex geological processes.
References [1] Zhiqiang Zhang, The value and characteristics of amber, Super hard Material Engineering 1673-1433 (2012) 06-0046-06
The contribution of color index in ruby’s quality evalution, Science and Technology Innovation Herald. 1674-098X(2009)05(c)-0239-02
[8] Haoxue Liu, The application of CIE uniform color space and color difference formulae[J], Journal of Beijing Institute of Graphic Communication,1004-8626(2003)03-003-06.

., determined experimentally for a defect-"free" material.
Romanjuk: Ukrainian Journal of Physics Vol. 60 (2015), p. 64 [11] B.
Walther: Materials Science and Engineering: B Vol. 76 (2000), p. 139 [32] I.J.

Material and Methods Signal processing plays a major role in biomedical engineering, especially to detect and eliminate noise in the ECG.
Awadallah,“Hybridizing β-hill climbing with wavelet transform for denoising ECG signals,” Information Sciences, Vol.429, pp. 229-246, 2018
[6] P.Singh, and G.Pradhan, “Variational mode decomposition based ECG denoising using NLM and wavelet domain filtering,” Australasian Physical & Engineering Sciences in Medicine,Vol.41, pp.891-904, 2018
Abdullah, “Separation enhancement of PLI noise from human ECG signal based on stone technique,” Journal of Biomimetics, Biomaterials and Biomedical Engineering, Vol.40, pp.71-78, 2019
[18] M.AlMahamdy, and H.B.Riley, “Performance Study of Different Denoising Methods for ECG Signals,” Procedia Computer Science, Vol.37, pp.325–332, 2014

By such procedure it is possible to select the most power effective materials, designs and products and buildings as a whole [6].
Also considers that the solution of these problems will be possible only after creation of applied science on providing  qualities of air in the room and to risk management.
Dependence of the cost of one square meter of the substructure and the insulation material and energy costs on the thickness of the insulation.
The received results allow to draw the following conclusions: · It is shown that the cost of a substructure of systems of hinged facades with an air ventilated gap depends on heater thickness, besides, need for use of additional quantity of elements of a substructure and the consumption of materials increases with increase in thickness
Some principles of combustion of homogeneous fuel-air mixtures in the cylinder of an internal combustion engine // Journal of Engineering Physics. 1990. №59(6).