The use of renewable energy sources is imposed as an imperative for the competitiveness and stable energy policy of companies. The basic production equipment in the "Kreka" coal mine in Tuzla has electrical plants with a total peak load of 12 MW, and the costs for electrical energy exceed €3.5 million annually. The paper analyzes the suitability of infrastructure facilities and devastated areas of the Kreka Coal Mine in Tuzla for the construction of photovoltaic power plants and the effects of such plants. The results of the analysis show a significant resource for the installation of photovoltaic power plants with a capacity of 230 MW. The production of electricity from these photovoltaic power plants enables a reduction of emissions into the air by 190 t/year of particle emissions, by 316.2 •103 t/year of CO2 emissions, by 58.15 t/year of SO2 emissions and by 251.9 t/year of emissions NOx. With the subsidized purchase of electricity, it is possible to return the investment within 6 years.

Smart surgical instruments are essential for overcoming many significant physiological limitations that surgeons face in their practice, such as the inability to scale a force in mN precision. Besides physiological tremors, weariness and poor kinaesthetic feedback on the part of a surgeon and patient movement, the lack of force perception represents a great technological challenge. Providing tactile feedback during the interaction of the instrument with the tissue facilitates the surgeon with better control of the applied force, thus preventing undesired trauma to the tissue or accidental trauma to the healthy tissues in proximity. In robotic surgery, surgeons should be able to scale applied force without direct contact with surgical tools. Surgical instruments with built-in FBG can attenuate surgeons' ability and help overcome limitations and prevent unwanted tissue damage in "free hand" surgery or robot-assisted surgery.