The rapid changes in the modern world and global market challenges make the development of investment and innovation policy crucial for regional growth. This study focuses on the Lviv region, analyzing the interplay between investment and innovation policy and regional development. Using the Wilcoxon T-test to compare regional investments across Ukraine in 2022 and the Wald test to examine research expenditures in Lviv, the findings highlight key trends and challenges. As of early 2023, Lviv ranked third in Ukraine for capital investments, among the top 10 regions. Its policy prioritizes industrial and construction development, forming the economic backbone of the region. Lviv also ranked fourth in research expenditures, following Kyiv and Dnipro. The region applies Smart Specialization to enhance participation in European funding mechanisms. However, several obstacles hinder policy effectiveness. Recommendations to address these include setting clear priorities, establishing Innovation Development Funds, enhancing innovation infrastructure, and fostering stakeholder collaboration. These measures aim to boost the region's investment and innovation potential, ensuring sustainable growth and competitive advantages. Lviv's regional policy is positioned as a catalyst for strengthening its economic and technological landscape, essential for maintaining its prominence in Ukraine's development trajectory.
The paper presents a comparative study on the effect of TiN, SiC, and TiN+Cr nanosized particles (NP) on the wear resistance, microstructure and corrosion behaviour of specimens of overlay weld metal. The specimens are obtained by manual arc overlay welding. Coated electrodes Е300 containing nanosized particles in the coating and base electrodes without any nanomodification are used. The effect of nanomodifying on wear resistance is determined by comparing the wear resistance of overlay welds produced with electrodes containing nanosized particles and overlay welds produced with base electrode under the same test conditions. The corrosion behaviour is studied using the method of cyclic immersion in 3.5% NaCl for 720 hours. Obtained data on the effect of the type and concentration of nanosized particles on wear resistance and corrosion behaviour of the weld metal are discussed in connection with the microstructure changes induced by the nanomodifiers added in the electrode coating.
This paper represents comparative tribological studies of a hypereutectic aluminum-silicon alloy AlSi18, without or with different types of modifiers – a standard modifier P, nanomodifiers SiC and diamond ND, as well as combinations of them – under the mode of dry friction on a surface with rigidly fixed abrasive particles. Results have been obtained concerning the wear characteristics – mass wear, wear intensity and wear resistance for different number of friction cycles. Results about the microstructure and the mechanical characteristics of the studied samples have been represented.
The present study investigates the coefficient of friction of new composites based on UHMWPE with the addition of different percentages of carbon nanotubes (CNTs) - 0.5%, 0.75%, 1.0% and 1.5%. UHMWPE samples with carbon nanotubes, samples of 0.5%, 0.75%, 1.0% and 1.5% carbon nanotubes (UHMWPE-CNTs) and samples with the same carbon nanotube content were made, but with carbon nanotubes subjected to Electroless Nickel Composite Coating with nanoparticles of SiC (UHMWPE-NiCNTs). The coefficient of friction is investigated with a tribometer in a kinematic scheme "Thumb-Disc" without lubricant in a high-alloy steel frame with hardness HRC=56.9 and roughness Ra=2.35 μm. All samples were tested under the same friction conditions - friction path, sliding speed, roughness of the counterpart and samples, ambient temperature. Results and regularities of the effect of carbon nanotubes UHMWPE-CNTs and UHMWPE-NiCNTs on the coefficient of friction at different normal loads are obtained. The microhardness of the materials under investigation was measured and its relationship to the percentage of CNTs and NiCNTs and to the coefficient of friction was analyzed. It was found that the highest micro-hardness belongs to the materials with 1.5% carbon nanotubes having a composite nickel plating (UHMWPE- 1.5NiCNT). This study and the results are related to the implementation on contract: ДН 07/28-15.12.2016 "Research and creation of new wear-resistant coatings using composites and nanomaterials", funded by the National Science Fund at the Ministry of Education and Science, Bulgaria.
The paper presents the authors general procedure for tribological processes study based on the communication potential and the general law of contact interaction in tribology. The procedure is applicable to arbitrary scope of perturbation influence, if the scope is divided into sectors, where the communication potential varies in a monotone. The procedure was implemented for a concrete case of static friction study in a contact system containing high–strength cast iron with various tin micro–alloys. The obtained results are as follows: – Procedure is developed and experimental relationship is obtained for the static coefficient of friction variation with the content of tin. – The communication potential of the static friction is attained and its experimental variation is obtained for the content of tin in the interval 0% to 0,032%. – The law for variation of the total communication potential with the content of tin in the interval 0% to 0,032% is obtained.
