The surface properties after the various treatment steps were characterized by the surface roughness parameters. An increase in the valley void volume can be beneficial in tribological applications in which a suitable oil retention volume is required. Accordingly, a thermochemical treatment combined with an appropriate subsequent finishing process is suitable to significantly influence the surface properties of thermal spray steel coatings. The article in [15] was devoted to the quality improvement of laser-induced periodic ripple structures on silicon using a bismuth-indium alloy film. In this work, a new buffer layer material, a bismuth-indium (Bi-In) alloy, was utilized to improve the quality of large-area, laser-induced periodic ripple structures on silicon. The single-spot investigations indicated that ripple structures were much easier to form on silicon coated with the Bi-In film under laser fluences of 2.04 and 2.55J/cm\({}^{2}\) at a fixed pulse number of 200 in comparison with on bare silicon. The results show that the Bi-In film enabled a wider range of laser fluences to generate periodic structures and helped to form regular ripple structures on the silicon. The results of research regarding the modification of nanocrystalline porous Cu\({}_{2-x}\)Se films during argon plasma treatment are presented in [16]. Cu\({}_{2-x}\)Se films were deposited on Corning glass substrates by radio frequency (RF) magnetron sputtering and annealed at 300 \({}^{\circ}\)C for 20 min under N\({}_{2}\) gas ambient. The films had a thickness of 850-870 nm and a chemical composition of Cu\({}_{1.75}\)Se. The initial structure of the films was nanocrystalline with a complex architecture and pores. The investigated films were plasma treated with RF (13.56 MHz) high-density, low-pressure inductively coupled argon plasma. Changes were evident in the surface morphology and chemical composition. In [17], the analysis of wear resistance based on the Discrete Element Method (DEM), in an abrasive wear system composed of pangolin scale models and abrasive sand was established. Their wear behaviors were discussed regarding the contact bond fields, the contact force chains, the velocity fields and the displacement fields of the abrasive wear system. The results show that the geometrical shape of the pangolin scale is helpful for decreasing the boundary stress, with the wear rate decreasing when the velocity is higher than 0.62 m\(\cdot\)s\({}^{-1}\). The antifungal properties of pure silver films with nanoparticles induced by the Pulsed-Laser Dewetting process were investigated in [18]. Silver particles were prepared by dewetting Ag films coated on glass using a fiber laser. The structural properties and surface roughness of the particles were evaluated by means of scanning electron microscopy. In addition, the antifungal activity of the Ag particles was examined using spore suspensions of C digeosporoides. It was shown that particles with sizes of 1.2 \(\upmu\)m achieved the 100% inhibition of conidia growth of C digeosporoides after a contact time of just 5 min. In [19], the influence of in situ local heat treatment performed via additional stitches on the weldability of high-strength, low-alloy (HSLA) S355J2C+N steel was tested. The local heat treatment was applied as an effect of bead-on plate welding made on the face of a Tekken test joint. The specimens were made using covered electrodes in the water environment. Then, different numbers of pad welds with different overlaps were laid on the face of the tested welds. Microscopic tests proved that the proposed technique affected the structure of the heat-affected zone (HAZ). The specimens in which the additional stitches were applied contained tempered martensite, fine ferrite and fine pearlite in their HAZ. The results of the experiments showed that the heat from pad welds provided microstructural changes in heat-affected zones and a decrease in the susceptibility to cold cracking. The articles in this Special Issue have been cited more then 40 times so far.