The problem of the use of banned substances (doping) in sport has been, is and will be an ongoing problem that undermines the very spirit of sport, beauty and pleasure, and very often the health of athletes. Therefore, it is essential to solve this problem, if possible, permanently, although it is sometimes simply impossible to do. It is this research that is designed to gain a real insight, express attitudes and perceptions of students on the use of doping in sport that is the information on this sports phenomenon of the modern age. The study included a total of 141 high school students (Gymnasium and Touristic technicians) from Pale, male, aged 15-19 +/- 0.5 years. The main objective of the study was to test the level of knowledge and identify students' attitudes about the use of prohibited substances in sport. To collect the necessary information has been used an anonymous questionnaire with 13 clearly defined questions (11 closed questions and two open-ended questions) that are related to specific knowledge, attitudes about doping in sport. The obtained results are relevant to the global indicator of awareness, knowledge and attitudes of the population of high school students about the problem of today's modern sport which is called doping. As many as 75% of the students the athletics, cycling and sports games marked as sports that are most marked by doping scandals, and 56% were tennis, golf games stated as a sport with the least number of doping scandals.

Tourism and hotel industry are one of the main priorities in the development of Bosnia and Herzegovina. Development of tourism is based primarily on raising the quality of hotel services. Hotel industry in Bosnia and Herzegovina is determined by an insuffi cient level of service quality, unfavourable structure and a low degree of capacity utilization. In an eff ort to improve the quality of services in hotel industry, and the satisfaction of tourists from emitting countries, hotel management is oft en faced with the problem of measuring the quality of services, which is a precondition for managing the quality of service provision.

Abstract Basic information concerning a Minimum Quantity Lubrication (MQL) machining is presented in the paper. Generally speaking, there are two groups of MQL machining with respect of aerosol composition classification. First group represents the aerosol as an air-oil mixture, and second group represents so called advanced MQL systems uses aerosol that includes not only oil but also some other components. There are two examples of advanced MQL systems: oil-on-water droplet and advanced minimum quantity cooling lubrication machining (MQCL machining). Investigation of influence of MQL (oil-on-water droplet system) machining parameters on cutting forces during MQL turning of carbon steel St52-3 is presented in this paper. Quantity of oil (10 to 50 ml/h), water (0.3 to 1.7 l/h) and position of nozzle (rake plane and clearance plane side of the tool) were factors which influence explored. Experimental results show the appearance of minimum cutting force during machining with 1.7 l/h of water, and 10 ml/h of the oil. Also, cutting forces are 17% smaller the same ones during machining without coolant and lubricant.