The management of healthcare institutions can be based on the introduction of relatively less used skills, such as the introduction of strong communication influences at the level of the patient-health institution connection, health institution-state authorities, patient-pension funds and others. In the entire system of such communication, the application of using the IT support system as a security mechanism is increasingly coming to the fore. In essence, communication and the results of such actions affect a large number of participants in the work of health institutions. The aim of this paper is to point out the importance of good communication in the business of health institutions, while at the same time using full or partial support of the IT system to support such activities. We discovered that it is important to continuously improve communication at all business levels within the scope of the operation of health institutions, as well as that it is necessary to design a usable IT system support system, because in this way it is possible to improve the overall results of the operation of health institutions.

The global energy landscape is undergoing significant transformation due to oil price volatility and the shift toward renewable energy sources. This study examines the economic implications of oil price fluctuations on energy markets, renewable energy investments, and global policies.
Employing econometric models (Vector Autoregression) and case studies, we analyze the interplay between oil price volatility, energy security, and energy transition pace. Findings indicate that oil price shocks exert short-term negative effects on renewable investments but show increasing decoupling in the long term, driven by policy support and technological advancements. The paper offers policy recommendations to mitigate volatility risks and accelerate sustainable energy transitions.

This study investigates the substitution possibilities between energy and non-energy inputs in Nigeria's manufacturing sector from 1981 to 2023. Utilizing a transcendental logarithmic (translog) cost function estimated via iterated Seemingly Unrelated Regression (iSUR), we compute both Allen and Morishima elasticities of substitution to analyze factor relationships. Results reveal significant substitution possibilities: capital and energy are substitutes with a Morishima elasticity (MES) averaging 3.66, while energy and labor show substitutability with an MES of 2.32. Conversely, capital and labor emerge as complements (MES = -1.94), suggesting that technological upgrading in this context requires simultaneous investments in human capital. These findings have crucial implications for energy and industrial policy, particularly in the context of energy price reforms and carbon taxation. We demonstrate that the Morishima elasticity provides more policy-relevant information than conventional Allen elasticities by capturing changes in input ratios rather than partial adjustments.

Darovita djeca su posebna djeca i takođe se ukazala potreba za poklanjanjem veće pažnje ovakvoj djeci, djeci sa iznadprosječnim koeficijentom inteligencije. Do sada se stalno najviše radilo sa tzv. prosječnim učenikom, kome je skoro bila prilagošena nastava u potpunosti, a darovita djeca su se zapostavljala u nastavnom procesu. Svakako je vrijeme da se dogode promjene i u ovoj oblasti. Potrebno je izraditi nove programe učenja za darovitu djecu, uključiti ih u razne nove vidove učenja kao što je to inovativna nastava i individualni program rada, te praćenje njihovog razvoja. Nastavni proces za darovitu djecu treba da bude izazov i mjesto gdje oni mogu da dalje razvijaju svoje sposobnosti i unaprijede svoje znanje. Na nivou škola bilo bi potrebno oformiti timove koji bi radili na pružanju pomoći i podrške ovoj djeci, te njihovom daljem promovisanju i napredovanju. Takođe bi mogli da pohađaju razne kampove za darovitu djecu gdje bi se i družili sa vršnjacima sličnih oblasti, ali i različitih kako bi naučili i nešto novo. Znamo da vrlo često još na početku pokazuju posebna interesovanja i sklonosti za određene predmete i područja njihovog učenja i razvoja. Veliki broj djece je talentovan i darovit, ali se to nažalost vrlo kasno otkrije, ili se ne otkrije uopšte. Da bi sve bilo kako treba takođe je potrebno sarađivati i sa roditeljima takve djece, te ih uključiti u posebne timove, ali i promovisati u lokalnoj zajednici, pa i šire. Darovita djeca su izuzetna u mnogim sferama i oblastima, te ih shodno tome moramo pripremati za cjeloživotno učenje.

Savremeno obrazovanje zahtijeva primjenu inovativnih didaktičkih pristupa koji odgovaraju potrebama učenika u digitalnom okruženju. Multimedijalna nastava predstavlja važan segment modernizacije nastavnog procesa jer omogućava integraciju različitih medijskih sadržaja u cilju unapređenja učenja. Cilj ovog rada je analiza uloge i značaja multimedijalne nastave u savremenom obrazovanju, sa posebnim osvrtom na njenu primjenu u razrednoj nastavi. Predmet istraživanja odnosi se na multimedijalnu nastavu kao savremeni didaktički pristup, dok su zadaci usmjereni na analizu njenih karakteristika, poređenje sa tradicionalnom nastavom i utvrđivanje njenog uticaja na motivaciju i uspješnost učenika. Metodološki okvir zasniva se na analizi stručne literature, komparativnoj i deskriptivnoj metodi. Rezultati ukazuju da primjena multimedijalnih sadržaja doprinosi boljem razumijevanju nastavnih sadržaja, većoj motivaciji učenika i razvoju digitalnih kompetencija. Zaključuje se da savremena škola treba da integriše tradicionalne i savremene metode rada kako bi odgovorila na potrebe učenika i zahtjeve društva.

Savremeni obrazovni sistemi naglašavaju potrebu za primjenom nastavnih pristupa koji podstiču aktivno učenje i razvoj kompetencija učenika. Problemska nastava predstavlja jedan od ključnih didaktičkih modela koji omogućava učenicima da kroz rješavanje problema razvijaju kritičko mišljenje i samostalnost (Hmelo-Silver, 2013). U kombinaciji sa interaktivnim učenjem, koje se zasniva na saradnji i komunikaciji među učenicima, ovaj pristup doprinosi kvalitetnijem usvajanju znanja (Johnson i Johnson, 2017).

Problem ovog rada odnosi se na nedovoljno sistematičnu primjenu problemske nastave u savremenoj školskoj praksi. Cilj rada je analizirati mogućnosti primjene problemske nastave kroz interaktivni pristup u razrednoj nastavi. Metodološki okvir zasniva se na analizi stručne literature i deskriptivnoj metodi, uz prikaz metodičkog primjera. Rezultati ukazuju da kombinacija problemske i interaktivne nastave doprinosi razvoju saradnje, motivacije i aktivnog učenja učenika (OECD, 2019).

The victory of Crvena Zvezda (widely known internationally as FC Red Star) in the 1990/91 European Cup represents an unparalleled and landmark achievement in the history of Yugoslav and Eastern European sport. This victory was not merely an athletic accomplishment; it carried profound socio-political and cultural implications for Serbia and the broader Yugoslav federation. In a moment when rising nationalist currents inflamed hostilities among the region’s peoples, Zvezda’s triumph represented one of the rare instances in which diverse communities found a fleeting point of unity. The analysis employs a qualitative research design based on secondary sources (newspapers, books, academic publications) and relies on an interdisciplinary framework that combines sociological, political, and cultural analysis. Findings indicate that studies of sport in conflict-affected societies can deepen understanding of identity formation and social cohesion. Through qualitative content and critical discourse analysis, the study traces the socio-political context and historical-cultural dynamics that shaped Zvezda’s 1991 European Cup victory. Integrating historical-cultural and socio-political perspectives, the paper argues that this victory functioned not only as a sporting achievement but also as a political and symbolic event. The research explores how these dimensions influenced Yugoslav society, the trajectory of the club, its supporters, and broader public reactions, clarifying the enduring impact of football on collective identity and social cohesion in the Balkans. Its legacy continues to influence perceptions of national identity and collective memory in the region, emphasising football’s role as a medium for both social cohesion and historical reflection. Focused on 1990/1991 and based on secondary sources, the study elevates Zvezda’s European triumph to a defining symbol of collective identity at the threshold of Yugoslavia’s dissolution - a legacy still echoing through the Balkans’ social and cultural consciousness.

Contemporary digital environments have significantly transformed the developmental context of adolescence, influencing the processes of socialization, identity formation, emotional regulation, and interpersonal relationships among young people. The subject of this paper concerns the analysis of the impact of social media and the modern digital environment on the psychological health of adolescents, with particular emphasis on anxiety, depression, the phenomenon of Fear of Missing Out (FoMO), and cyberbullying as dominant psychosocial risks of the digital age. Furthermore, the study analyzes the role of the school system in the prevention of cyberbullying. The aim of this paper is to examine, through a review of relevant contemporary literature, the ways in which the digital environment affects the fulfillment of basic psychological needs and the resulting psychological outcomes. Methodologically, the paper is based on a review analysis of scientific sources from the fields of psychology and digital studies. The findings indicate that the use of social media is potentially associated with reduced psychological well-being, thereby confirming the importance of internal motivational mechanisms in understanding adolescents’ digital behavior.

Ensuring the proper operation of a ship’s propulsion system necessitates the use of high-quality fuels. Several factors contribute to fuel quality, including the source of origin crude oil, refining methods, blending processes, and the quality of storage and distribution. Marine fuels must adhere to international standards such as ISO standards to be suitable for consumption on ships.

This article presents an analysis of over 6000 fuel samples obtained from two sample points within a purification system, conducted by independent laboratories. While all samples must meet the ISO 8217:2017 Standard for marine residual fuel before bunkering, this analysis focuses on elements with potentially harmful effects on marine engine systems. A comprehensive examination will be conducted, employing an inductive method to draw general conclusions about the current levels of abrasive impurities and other detrimental elements in fuels post-purification.

Specific attention will be given to elements like aluminium, silicon, vanadium, calcium, magnesium, lead, nickel, potassium, sodium, zinc, and phosphorus present in residual fuel oils. These elements, in certain forms or concentrations, pose challenges to marine engines. Testing conducted according to the IP 501 standard, utilizing inductively coupled plasma emission spectrometry, is essential to ensuring smooth engine operation and mitigating damages and associated costs caused by abrasive fines in the fuel oil.

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.