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The subject of this paper is irregular migration and modern models of preventing the smuggling of migrants on the part of the Western Balkan route through the Republic of Serbia. The goal is to show how the new strategic approach of the Serbian police in this area can give excellent results, that the application of modern methods of policing and technical means are aimed at preventing the smuggling of migrants, i.e., the illegal movement and transport of migrants across the state border and state territory to go to countries of the European Union. Based on the conducted research, the authors have drawn certain conclusions: 1) effectiveness, efficiency, and economy in the area of suppression of irregular migration can be achieved by applying an adequate criminal strategy, 2) the new strategic approach led to the discovery and arrest of a large number of people smugglers and the discovery of illegal firearms, 3) the use of modern technical means, coordinated, joint work of different police units and management from a single center by a strategic level manager directly in charge of combating irregular migration and human smuggling in a particular area (territory) which is estimated to be a hotspot of criminal activity, is a prerequisite for success. [ABSTRACT FROM AUTHOR]

The use of deadly force in the Republic of Serbia is regulated by the Law on Police and the Rulebook on Police Powers. Empirical research on the use of deadly force or on refraining from the use of deadly force has never been undertaken in Serbia. Therefore, the research presented in this paper is the first on this important topic. It focuses on the use of firearms, abstinence from the use of firearms, and training in the use of firearms. In order to assess the competence of members of the Police Directorate of the Ministry of Interior of the Republic of Serbia in the use of firearms (FA), a structured questionnaire developed by using close-ended, multiple-choice questions, and 5-point Likert scale questions (1 for strongly disagree to 5 for strongly agree) was used in the study. The research was conducted from September to October 2022. The research showed that the use of deadly force by members of the police in Serbia is rare, and that it generally does not differ largely from other European countries. [ABSTRACT FROM AUTHOR]

Thermo-chemical conversion of cigarette butt filters (CBF) waste was investigated using various thermal analysis techniques (simultaneous TG-DTG-DTA and DSC methods) at different heating rates in an inert atmosphere. Thermo- and thermophysical properties of waste material were discussed, from the point of view of chemical structure and the influence of experimental parameters on the conversion process. It was established that acetyl groups of plasticizer (triacetin) interact with cellulose acetate through dipolar interactions and hydrogen bonding's. Influence of these polar interactions can affect the position of glass transition temperature, Tg, of CBF. Based on estimated value of Tg from DSC analysis, it was found that cellulose acetate present in CBF has degree of substitution equals to 2.8, where the presence of cellulose triacetate was confirmed. It was assumed that an increase of degree of substitution leads to decline in the crystallinity. A decline of crystallinity causes the reduction of hydroxyl groups, leading to less organized chains, and whereby decreasing of inter-molecular interactions through hydrogen bonding. Based on the examination of thermophysical characteristics of the tested material, it was found that both, the heat capacity and the thermal inertia of material linearly increase with temperature, during pyrolysis progression. It was concluded that the type of bio-char produced in this process would have a large capacity to store the heat, which may depend on the formed particles size diameter and porosity. Furthermore, it was inferred that magnitude drops of thermal conductivity, κ, after Tg depends on the material fibrillation. [ABSTRACT FROM AUTHOR]