Journal of Engineering and Management

Underground Gas Storage - Reliability of Energy Security

Milan Zečar — Sat, 31 Jan 2026 00:00:00 +0000

The current geopolitical situation in the world confirms that the struggle for possession of mineral and energy resources is the most common reason for confrontations and conflicts across the planet.

Usually, natural gas and oil represents the most important energy resources, especially for powerful countries. Therefore, having sufficient capacities of underground gas storage is of particular importance in the economy and industry of each country.

This professional paper discusses the issue of uneven consumption of natural gas, the strategic importance of underground gas storage and the necessity of its construction in order to resolve the discrepancy between production and consumption, optimal exploitation of gas deposits, security and supply of gas, especially to large consumers, reducing production costs and leasing storage facilities, and more efficient use of the gas transportation and distribution system.

The intention of this article is to demonstrate the justification for building and possessing the necessary underground gas storage capacities, which would enable and guarantee the smooth functioning of the energy and industrial system of every country, including Serbia, especially in emergency conditions.

Full Discrete Form of Heat Conduction Equation by Meshless Fragile Points Method (FPM) and Various ODE Solvers

Rade Grujicic — Sat, 31 Jan 2026 00:00:00 +0000

According to recent studies, the Fragile Points Method (FPM) has emerged as a highly promising technique for addressing problems related to heat conduction analysis. This paper further develops and extends the investigation of FPM by implementing and comparing several explicit and implicit time integration schemes for solving the resulting systems of ordinary differential equations (ODEs). In total, six fully discrete formulations of the general heat conduction equation are derived and presented. The study includes a detailed assessment of each algorithm’s computational complexity, execution time, and relative numerical accuracy, providing a comprehensive evaluation of their performance. The convergence and stability of the FPM approach were verified through multiple benchmark problems with known analytical solutions in both one and two dimensions. Furthermore, it was demonstrated that the presence of non-homogeneity and anisotropy in the analysed media does not introduce additional difficulties for the method. When compared with explicit techniques, the implicit formulations proved to be more efficient for stiff problems, achieving stable solutions while maintaining comparable computational costs.

THE ROLE OF ORGANIZATIONAL LEARNING IN ENCOURAGING INNOVATION

Thu, 12 Feb 2026 00:00:00 +0000

The aim of this paper is to examine the impact of dimensions of organizational learning on the innovation of middle management in companies in Serbia, which operate in the conditions of a transitional economy and limited resources. Organizational learning was observed through seven dimensions (continuous learning, research and dialogue, team learning, systems for recording and sharing knowledge, collective vision, connecting with the environment and strategic leadership), while innovation was measured through product and service innovations, process and administrative innovations. The research was conducted on a sample of 406 respondents at the middle management level, using a survey questionnaire and a Likert scale (1-7). Data were analyzed by multiple regression analysis in SPSS 26.0. The results show that the model explains 49.2% of the innovation variance, which confirms the significant influence of organizational learning on innovative behavior. The strongest positive predictors are knowledge recording and sharing systems (β = .411), strategic leadership (β = .281), collective vision (β = .249) and connection with the environment (β = .131). Two dimensions, research and dialogue (β = –.290) and team learning (β = –.180), showed a significant negative impact, while continuous learning was not statistically significant. The findings indicate that innovation depends on a balanced approach to different learning practices, where institutional support, leadership and openness to the external environment play a key role, while excessive insistence on discussion or teamwork can be counterproductive. The results contribute to the improvement of existing business practices, a. it is recommended to develop integrated systems for knowledge management, strengthen the role of leaders in learning and encourage an open organizational culture.

Upravljanje kvalitetom i bezbjednošću u lukama: normativni okvir i praktična primjena

Pavle Popović, O. Iker, D. Vujović — Sat, 31 Jan 2026 00:00:00 +0000

Glavna motivacija za izradu ovog naučnog rada proističe iz savremene potrebe za razvojem integrisanog i sveobuhvatnog modela upravljanja bezbjednošću luka i lučkih postrojenja, posmatranog iz ugla sistema upravljanja kvalitetom. U fokusu je primjena Integrisanog sistema menadžmenta (IMS) kao strateškog i holističkog okvira koji objedinjeno tretira zahtjeve međunarodnih standarda iz oblasti:upravljanja kvalitetom (ISO 9001),bezbjednosti lanca snabdijevanja (ISO 28000),zaštite zdravlja i bezbjednosti na radu (ISO 45001),zaštite životne sredine (ISO 14001), informacione bezbjednosti (ISO/IEC 27001),uz puno poštovanje normativnog sistema koji proističe iz Međunarodnog kodeksa za bezbjednost brodova i lučkih postrojenja (ISPS Code).

Deindustrialization – imperative for poor countries development

Edi Daruši, M. Rančić — Sat, 31 Jan 2026 00:00:00 +0000

Усредсређујући се на размену и потрошњу унутар глобалног тржишта данас преовлађујућа неолиберална школа мишљења у потпуности занемарује област производње као моћан генератор привредног и друштвеног развоја економски неразвијених држава. С обзиром на то да се друштвено-економски развој постиже индустријализацијом те да су од индустријске револуције наовамо фабрике места на чијим темељима је и подигнут модерни свет, у данашњем, наводно постиндустријском, друштву прерађивачка индустрија ипак представља мотор економског раста. Квалитет примењеног знања, иновације и технолошка достигнућа, пословна организација, а не тржиште производа, доприносе развоју сиромашних држава.

Effect of Tool Wear on Axial Drilling Force and Maximum Height of Surface Roughness Profile

Radoslav Vučurević, Zdravko Krivokapić — Thu, 12 Feb 2026 00:00:00 +0000

Usljed kontakta reznog alata sa materijalom za obradu i pojave trenja dolazi do habanja alata koje se manifestuje promjenom njegovih reznih svojstava i u krajnjem slučaju zatupljenjem alata koje ima negativan uticaj na kvalitet obrade. Shodno tome, potrebno je pratiti veličinu habanja alata i izvršiti njegovu pravovremenu zamjenu. Kao kriterijumi zatupljenja alata mogu se uzeti dostizanje granične vrijednosti širine habanja na leđnoj površini, povećanje sila rezanja, povećanje vibracija, promjena zvuka tokom procesa obrade ili pogoršanje kvaliteta obrađene površine. Habanje alata, dakle, utiče na promjenu izlanih parametara procesa obrade, što za posljedicu ima promjenu kvaliteta obrađene površine, a nakon toga dovodi i do promjene oblika i dimenzija. Upoređivanjem vrijednosti aksijalne sile bušenja i maksimalne visine profila hrapavosti, dobijenih provođenjem eksperimenta za različite vrijednosti ulaznih parametara procesa obrade bušenjem, na početku odvijanja procesa i u trenutku zatupljenja alata, u ovome radu dolazi se do saznanja o veličini uticaja habanja alata na aksijalnu silu bušenja i maksimalnu visinu profila hrapavosti površine.

APPLICATION OF FRACTIONAL FACTORIAL DESIGN AND DIMENSIONAL ANALYSIS FOR ANALYSIS OF MAIN CUTTING FORCE IN TURNING

Jelena Stanojković, M. Madić, M. Trifunović, P. Janković — Sat, 31 Jan 2026 00:00:00 +0000

Cutting forces are very important aspect of machining processes because they directly affect heat generation and cutting power, tool life and energy consumption. Cutting forces can also be used as an auxiliary criterion for the evaluation of material machinability. This paper presents the application of dimensional analysis (DA) model for prediction of the main cutting force in dry longitudinal single-pass turning of not heat-treated non-alloyed and low-alloyed steels with carbon content higher than 0.55%. A fractional factorial design was used to arrange six parameters: depth of cut, feed rate, cutting speed, rake angle, cutting edge angle and tensile strength as workpiece material mechanical property. The machining calculator of the cutting tool manufacturer was used for estimating the main cutting force for five workpiece material groups. The analysis of the results encompassed the evaluation of main and interaction effects of the considered parameters, the development of quasi-linear and DA-based prediction models, and the interpretation of the DA model coefficients. The experimental and validation results indicated that the DA model has good potential for prediction of the main cutting force in turning processes.