Aluminium and silicon particles in fuel known as “cat fines” are catalytic residues from the refinery process. They can cause mechanical damage to fuel pumps, injectors, piston rings and cylinder liners. They are very hard and highly abrasive, thus causing abrasive wear to main engine components. These impurities in marine fuel must be minimised to recommended levels. One of the main tasks of the fuel treatment plant on a ship is to separate solids and water from the fuel. Modern vessels are equipped with fuel separators which rotate at a high speed (more than 6,000 rev/min) producing centrifugal force and providing good separating effect even for small solid particles (Al+Si). Proper settling and regular drainage from the tanks, even when adequate filtration is applied, are not sufficient for proper fuel preparation. The quality of purifier operation varies over years because it is affected by a large number of factors. For the purpose of this paper, over twelve thousand fuel samples were analysed to determine the current efficiency of the purifiers and whether they can meet the stringent requirements of marine engine manufacturers. The data will be taken from a tanker ship, considering different operational scenarios. These scenarios are linked to the maximum possible fuel consumption on the ship during exploitation. Using the Simulink program for the system simulation, optimisation can be achieved in the operation of fuel separator. This optimization refers to the required amount of fuel and quality of separation, particularly concerning the removal of abrasive impurities.

The existence of an efficient system of public health care in the social community is a characteristic for a quality social entity and a measuring element of the life quality in a population. Like any other sub-system in the state, it is necessary to finance the sustainable development of the public health system. The paper contains an analysis of several payments models from the funds of the obligatory health insurance to the health system and health service providers, with a presentation of the existing systems and models of covering costs. For this purpose, research was conducted by comparing historical data on health care costs and analyzing their trends. The aim of the paper is to research and select adequate financing models for provided health services, which is the job of managers in health care, in order to choose between several models developed for this purpose. The manner in which health care costs are settled in the Republic of Srpska, as well as the amounts in the observed period, is also shown. Conclusions on trends confirmed, that the costs of medical treatments, for which the state allocates money for the health care system, are increasing. At the same time, it was observed that the number of insured persons is decreasing, and that despite the relatively high average allocation for treatment per capita, considerable amounts of direct personal payment for services and medicines are still high, which are either not available from obligatory health insurance, or are difficult to access through regular procedures. Keywords: health care, health insurance, medical costs, financing models.

Nasilje nad ženama identifikuje se kao stalna odlika bosanskohercegovačkog društva, sa sve izraženijom tendencijom da i femicid postane njegova konstanta. U prvom dijelu rada analizira se značaj feminizma kao segmenta ideološkog političkog diskursa koji utiče na zakonodavnu aktivnost političke vlasti, ali i na društvo na opštem nivou u odnosu i borbi protiv nasilja nad ženama. Ukazano je na specifičnosti feminizma, na istoriju i razvijenost ženskog pokreta u Bosni i Hercegovini, sa fokusom na nedovoljnu prihvaćenost, uvaženost i uključenost feminizma u politički život našeg društva.

Porodica kao osnovna ćelija društva, danas je ozbiljno ugrožena, s obzirom da je povećan broj nasilja u porodici gdje je žrtva najčešće žena. Stoga, u kontekstu nasilja u porodici, drugi dio rada se bavi problematikom nasilja nad ženama, prvenstveno femicida, sa zakonskog aspekta.

Cilj je ukazati na značaj inkriminacije femicida i adekvatne zakonske zaštite žena, a sve u cilju prevencije femicida, procesuiranja i kažnjavanja izvršioca.

The term "lifestyle" is a central concept of Adler's theory of personality, which he defines as a characteristic pattern of behavior that is a manifestation of a unique way of perceiving, conceptualizing, behaving and personal striving towards a goal that is filled with subjective meaning and represents part of the striving for power (Croake, 1975). Personality traits represent dimensions of individual differences that relate to a person's tendency to exhibit consistent patterns of thought, feeling, and action (McCrae & Costa, 1985). The research sample consisted of a total of 211 respondents, mostly students of the University of East Sarajevo surveyed via online questionnaires, of which 135 were female and 76 were male. Measuring instruments with satisfactory measurement characteristics were used: Questionnaire for examining the Big Five personality model (Goldberg, 1992), a modified version of the Allport-Vernon-Lindzis value scale for measuring lifestyles, a Scale for examining the sociodemographic characteristics of the respondents, and a Scale for examining academic performance. The obtained data show that of all personality dimensions of the Big Five model, only conscientiousness has a statistically significantly positive correlation with achieved academic success expressed through the average grade in studies (r=.24), which is not surprising, because this is a trait that is consistently associated with academic and business success in a large number of studies. Four lifestyle styles statistically significantly correlate with achieved academic success: family-sentimental style (r=.15), cognitive style (r=0.16), popularity-oriented style (r=-.19) and Promethean activism (r=.15). Although none of the mentioned correlations are high, they indicate the undoubted existence of a connection between these constructs and the role that lifestyles as complex systems of values, goals, attitudes and beliefs play in determining the final forms of behavior and achieved results within the educational system.

Learning is a value for every student, for every school, for parents, teachers and for society as a whole. Numerous studies show that educational effects can be achieved in traditional (frontal) teaching, but the results of experimental research in most cases show that under the influence of innovations and modern strategies, methods and procedures, educational achievements are more easily achieved, which can be viewed comprehensively in the context of research outcomes related to both education and upbringing. The application of new approaches in learning leads to the development of students' creative thinking, the teaching process becomes more creative. The aim of this paper is to determine the level of achievement of students solving mathematical problems from Numerical Expressions by applying problems by levels of complexity, problem solving of problems and the traditional way of solving problems.

Suicid predstavlja značajan problem u savremenom društvu, često opterećen brojnim predrasudama koje doprinose stigmatizaciji i otežavaju preventivne aktivnosti. Iako se smatra da su psihijatri i psiholozi ključni u prevenciji, uloga zdravstvenih radnika u primarnoj zdravstvenoj zaštiti je vrlo važna, s obzirom na njihovu dostupnost i prvi kontakt sa pacijentima. Cilj ovog istraživanja bio je ispitivanje stavova, uverenja i nivoa informisanosti zdravstvenih radnika (medicinskih sestara, lekara opšte prakse i specijalista) o suicidu, kao i identifikovanje obrazovnih i profesionalnih razlika koje utiču na formiranje ovih stavova. Istraživanje je sprovedeno tokom maja 2023. godine u dva doma zdravlja u Vojvodini i u njemu je učestvovalo 216 zdravstvenih radnika. Primenjen je upitnik, konstruisan na osnovu IKAB modela, koji obuhvata tri celine: društvena uverenja o suicidu, činjenične tvrdnje i lične stavove. Rezultati ukazuju da među ispitanicima postoje brojne predrasude u vezi sa suicidalnim ponašanjem, ali i da su medicinske sestre pokazale najmanji stepen netačnih uverenja. Značajne razlike u stavovima primećene su u odnosu na profesionalni status, pri čemu lekari opšte prakse češće izražavaju rigidnije stavove. Ukupna informisanost o suicidu bila je nezadovoljavajuća, posebno u segmentu činjeničnih znanja. Rezultati ovog istraživanja su ukazali na neophodnost dodatne edukacije zdravstvenih radnika, bez obzira na profesionalni profil, kako bi se umanjile predrasude i poboljšala efikasnost u prepoznavanju i reagovanju na suicidalne rizike. Ovi nalazi mogu da pomognu u kreiranju edukativnih i preventivnih programa usmerenih na smanjenje stigme i unapređenje podrške osobama u suicidnoj krizi.

The adsorption process of metal oxide nanoparticles has been studied as an effective means of removing organic and inorganic contaminants from water and wastewater. In this study, iron (III) oxide (Fe3O4) nanoparticles were synthesized in the presence of moringa oleifera pods (MOP) as an adsorbent for ciprofloxacin (CIP) adsorption. Moringa oleifera pod biochar with Fe3O4 particles precipitated on the surface of biochar was synthesized by co-precipitation method. The effect of various parameters such as contact time, pH, metal concentration and adsorbent dosage on the removal efficiency was determined. The maximum adsorption capacity of CIP by magnetic moringa composite (MMC) was 96.12 mg/g. The Langmuir and Freundlich isotherm equations were used to analyze the equilibrium isotherm data. The adsorption process fit well with the second-order kinetics in all cases, and the Langmuir isotherm equation fitted well with the experimental data.

The environmental hazards of antibiotics have captivated increasing research focus, but their environmental behaviours remain unclear in water sources. Thus, this study focused on exploring the interaction mechanisms between Moringa Oleifera pod-modified feldspar clay (MFC) and ciprofloxacin (CIP) during sorption process. The efficiency of these adsorbents in aqueous solution adsorption of CIP were investigated as a function of pH, time and sorbate concentration. The impact of pH solution and CIP evolution showed that CIP sorption on MFC is strongly reliant on pH solution. Kinetic studies authenticated that the CIP sorption mechanism was a physisorption involving ion exchange and surface complexation mechanisms. The mechanism of CIP sorption on MFC was successfully studied using characterization techniques. The Langmuir and Freundlich isotherm equations were used to analyze the equilibrium isotherm data. The adsorption process fitted well with the second-order kinetics and the Langmuir isotherm equation fitted well with the experimental data. The Langmuir isotherm showed that maximum adsorption capacity was found to be 57.61 mg. g-1. Thermodynamic factors: ΔG° values of -29 kJ.mol-1, ΔH° = 17 kJ.mol-1, and ΔS° = 163 J.mol-1 k of CIP adsorbed onto MFC indicate that the adsorption was spontaneous and endothermic in nature.

The adsorption process by metal oxide nanoparticles has been investigated an effective agent for removing organic and inorganic contaminants from water and wastewater. In this study, iron oxide nanoparticles were synthesized in the presence of moringa oliefera pods as adsorbent for lead, copper and cadmium ions adsorption. Moringa oliefera pods biochar with Fe3O4 particles precipitated on the surface of biochar was synthetized by co-precipitation method. Batch adsorption method was used, and heavy metal ions percentage recovery was measured using ICP-OES. Effect of various parameters such as contact time, pH, metal concentration and adsorbent dosage was determined on the removal efficiency. The maximum adsorption capacities of Pb2+, Cd2+, and Cu2+ by MMC were 31.46 mg·g−1, 29.05 mg·g−1 and 27.66 mg·g−1, respectively. The Langmuir and Freundlich isotherm equations were used to analyze the equilibrium isotherm data. The adsorption process fit the second-order kinetics well in all cases, and the Langmuir isotherm equation fit the experimental data well.

The ACE-R is a widely accepted instrument in clinical practice, the revisions of which have been overcome certain weaknesses. The aim of this paper was to present the results of the ACE-R test research, and to analyze and compare the results obtained in the work with a healthy subject and a clinical subject diagnosis. The respondents are of similar age and similar characteristics. Selected from the clinical population is a respondent with a diagnosis of depression after a stroke, which is the most common a complication of the same. The results obtained in this paper partially confirmed the results of the previous ones research. The application of the mentioned test showed that the two respondents differed in their views measured abilities: the subject with a diagnosis of depression produces difficulties in recognizing tasks material, and verbal fluency and visuospatial abilities are reduced compared to healthy the respondent.