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Open access

Ioan Sabin Sopa and Marcel Pomohaci

systems specify to the training in military pentathlon. The 23rd International Conference Knowledge-Based Organization , Vol. XXII, No. 1 , Sibiu, România: “Nicolae Bălcescu” Land Forces Academy Publishing House. Epuran, M. (2001). Psihologia sportului de performanţă. Bucureşti: FEST, 324-336. Harman, E. A. et al. (2008). Prediction of simulated battlefield physical performance from field-expedient tests. U.S. National Library of Military Medicine, Vol. 173 , 36-41. Jeong, C. S. (2006). Characteristics of performance-related physical fitness and

Open access

Paul Marc and Ciprian Costescu

asphalt concrete. J Mater Civ Eng 2005;17:72-9. [5]. Spalding DB. Pun WM.- A review of methods for predicting heat transfer coefficients for laminar uniform property boundary layer flow. Int J Heat Mass Transfer 1999;5:239-49 [6]. Zhao J. Ai X. Li YZ. - Transient temperature fields in functionally graded materials with different shapes under convective boundary conditions. Heat Mass Transfer 2007;43:1227-32. [7]. Xu Q. Solaimanian M. - Measurement and evaluation of asphalt concrete thermal expansion and contraction. J Test

Open access

Eva Jereb, Janja Jerebic and Marko Urh

Abstract

Background and purpose: Competition among higher education institutions is intensifying and such institutions are increasingly directing efforts towards improving their ranking. In this context, both high-quality programmes and student satisfaction have become major goals of universities. In our study, we tried to identify the importance of various factors influencing student satisfaction in higher education institutions.

Design/Methodology/Approach: A paper-and-pencil survey was carried out in the 2017/18 academic year at the University of Maribor in Slovenia. Students were verbally informed of the nature of the research and invited to freely participate. They were assured of anonymity. Mean values and standard deviations of the responses were calculated. Friedman test was conducted to assess which satisfaction factors were a priority for the students. Independent samples t-test was used to examine whether a significant difference exists between specific groups. The correlations between satisfaction factors and selected study variables (age, average grade and readiness to spread information) were tested using Pearson correlation coefficients.

Results: The study results revealed that the most important factors influencing student satisfaction were teaching staff, followed by administrative support, programme issues, physical environment, location of the institution, social life and support facilities. Significant differences between the genders were found for two satisfaction criteria, i.e. programme issues and administrative support, both being more important to women than men. We also found that the higher the level of the class, the lower was the importance of the satisfaction factors.

Conclusion: The results of this study indicate that higher education institutions need to focus efforts on improving the quality of teaching aspects so as to respond to the needs of their students, but also that they should not neglect non-teaching factors, especially regarding the physical environment. With improving these factors institutions can raise students’ satisfaction, gain on the reputation and impact future enrolment.

Open access

Marek Makowiec and Arkadiusz Potocki

Summary

In the study authors, on the basis of completed two different tests, pointed out the most common difficulties and dysfunctions in communication in contemporary organizations. Both traditionally functioning economic entities and organizations which employ teleworkers, where there is much more variety of problems, including due to lack of physical contact between people, were analyzed. In such situations a big impact on improving the process of information flow between people has modern technology and IT technology, which, however, has a negative impact on humans.

Open access

Maja Rožman, Sonja Treven, Vesna Čančer and Marijan Cingula

Abstract

Background and Purpose: People spend a significant part of their lifespan working, but the role of age in job design and implementation of work have largely been ignored. The consequences can be evident in stress and burnout in different symptoms. Thus, age-diverse employees are faced with different symptoms of burnout and stress when carrying out their work. The main aim of this paper is to present burnout of older employees compared to younger employees in Slovenian companies.

Design/Methodology/Approach: The paper is based on research including a survey between two age groups of employees, namely the younger employees that were classified in the group of under 50 years of age and the older employees that were classified in the group of above 50 years of age. Since the Kolmogorov-Smirnov and Shapiro- Wilk test showed that the data was not normally distributed, the noan-parametric Mann-Whitney U test was used to verify differences in the physical symptoms of burnout, emotional symptoms of burnout, and behavioral symptoms of burnout in the workplace between two groups.

Results: The results show that there are significant differences in the great majority of the variables describing the physical symptoms of burnout, emotional symptoms of burnout, and behavioral symptoms of burnout in the workplace between younger and older employees.

Conclusion: Well-being in the workplace of age-diverse employees is a key for long-term effectiveness of organizations. Managers and employers should apply appropriate measures to reduce burnout as well as to contribute to employees well-being and better workplace performance.

Open access

Friderika Kresal, Tine Bertoncel and Maja Meško

(1), 16-21. Leclerc, A. (2017). Work-related physical exposure and low back pain. Occupational and Environmental Medicine , 74 (3), 161-162. http://dx.doi.org/10.1136/oemed-2016-103986 Lerouge, L. (2014). Droit de la santé-sécurité et risques psychosociaux au travail: Où situer le système français au regard des systèmes étrangers? In Lerouge L. (Ed.), Risques psychosociaux en droit social: Approche juridique comparée France/Europe/Canada/Japon (pp. 4-19). Paris, France: Dalloz. Linton, S. J. (2001). Occupational psychological factors

Open access

Zdzisław Naziemiec, Paweł Pichniarczyk and Daniel Saramak

Abstract

The article regards the issues related to chalcedonite processing by means of particle size classification as well as densimetric separation. Chalcedonite is an unique rock and material with wide industrial applications in various industries. The investigative program included laboratory tests of chalcedonite classification in the classifier and the jig, as well as separation of the material in the dense liquid. The obtained results indicate that the products of particle size classification of chalcedonite in the classifier are characterized by a different chemical and mineralogical composition. The 0-0.3 mm particle size fraction contains over 96% of quartz, while the fine size fraction below 0.063 mm contain about 80% of quartz and 20% of clayish minerals. In the next stage of the investigative program, the densimetric separation of chalcedonite material in the jig and in dense liquid, was carried out. The results of the density classification in the jig indicate the different absorbability of the obtained chalcedonite density fractions. Fractions with a higher density were characterized by lower water absorption. The results of separation in the dense media liquid also showed that the obtained aggregate products are of significant differences in absorbability as well as high variability of the strength parameters. The results of the investigations show that the obtained products of the classification can be more efficiently utilized in industry, due to their diverse chemical and physical characteristics.

Open access

Henryk Parzentny and Leokadia Róg

Abstract

A total of 56 coal seam samples (from active and closed coal mines) representing USCB Paralic Series, were tested. It was determined that the tested coal has low content of mineral matter (especially in Hruśov Beds) as well as of Ag, As, Ba, Cd, Co, Cr, Cu, Mo, Ni, Rb, Sb, Sn, Sr, V and Zn. Only Mn and Pb content in coal is higher than in coal from other deposits around the world. There are differences in the values of physical and chemical, petrographic and geochemical indices of coal quality, between the northern and the south-western part of the USCB and in the profile of the Paralic Series.

Thanks to the revealed correlations between the indices of coal quality, significant differences in the role mineral and organic substance play in concentrating some of the trace elements in the tested coal, were determined. Moreover, it was observed that an increase in the rank of coal (expressed with an increase in the value of R0 or/and Qs daf or/and Cdaf), accompanies a decrease in the content of oxides of main elements in coal ash as well as sulfur and other trace elements in coal. The dependence was observed both in lateral and stratigraphic differences in the rank of coal. Mutual dependences between the indices of the rank of coal (R0, Cdaf, Qs daf, Vdaf) in the northern and south-western area of the research and in Poruba Beds and Jaklovec Beds, were confirmed.

It was determined that an increase in the value of Roga Index (RI) is accompanied by an increase in P2O5 content in ash of coal from the south-western part of the research area. It is probably a result of concurrence of a regional positive anomaly in the rank of coal and high P2O5 content in coal seams in the south-western part of the USCB. The observed increase in the value of RI, accompanying a decrease in the content of sulfate minerals, Cr and Ni in coal and Na2O in coal ash; results from the role the carbonisation process plays in distributing main and trace elements in the mineral matter of coal.

Open access

Beata Klojzy-Karczmarczyk, Janusz Mazurek and Krzysztof Paw

Abstract

In recent years, the economic importance of gangue mined during coal production has changed and it is currently treated more and more often not as waste but as a source of mineral resources for economic use. The overriding objective throughout the reclamation process of open-pit mines associated with the utilization of external material is to make sure that the placement of waste rock on the surface does not cause damage to the environment. The paper presents results of the diagnosis and evaluation of the possibility of filling open-pit mine workings with mining waste or other materials, for example aggregates produced on the basis of gangue, originating in the Janina Mine mining plant (a subsidiary of TAURON Wydobycie S.A.). The study involved aggregate or coal silts from dewatering on the filter presses. The evaluation refers to the legal aspects and takes the requirements of pollution prevention into account, with a particular emphasis on soil, surface water and groundwater. The analysis of the potential impact on the soil and water environment of the project involving reclamation of the open-pit excavation with the use of minerals or waste from coal mining was carried out based on a study of the total content of sulfur and other elements in the samples pierwiastków (As, Cd, Co, Cr, Cu, Hg, Mo, Ni, Pb, V and Zn), as well as of the leaching of components. Moreover, an examination of the coefficient of permeability and porosity was conducted, which allowed the suitability of the material for the construction of insulating layers to be determined. The physical and chemical analyses were conducted on a total of over a dozen samples of waste rock, a byproduct of the enrichment of coal in the Janina Mine plant. The specific studies of the total sulfur content were conducted for the 16 primary samples scattered into 15 fractions each. Moreover, the so-called secondary samples were created, meaning that fine fractions of less than 20 mm and less than 10 mm were rejected. The total content of the selected components was examined for such crafted samples and their concentrations were determined in the leachable form (batch test 1:10). In the case of use of waste rock as an aggregate for quarry reclamation, a comparative analysis was applied to the legal requirements assigned to the mining waste and the quality of soil and water environment. Based on the conducted studies, it has been concluded that the coal silts (filter cakes) are characterized by good insulating properties and can be used for waterproofing objects, especially in the industrial, communications and mining areas. However, coal silts do not meet the quality requirements, mainly due to their slightly increased chlorides content, in addition to being a waste, which in some cases limits the possibility of their use. The best quality parameters were found for the gangue from the Janina Mine (on the basis of which aggregates are manufactured), but deprived of fine fractions. Physical and chemical analyses of the total content of elements in the secondary samples showed that the obtained values are within the allowable ranges determined by appropriate regulations for the vast majority of samples. The limit of 1% was assumed for the sulfur content. The conducted research on the leaching of pollutants indicates that the tested samples do not introduce contaminants exceeding the limit values for the analyzed metals and sulfates. Only single exceedances of the analyzed parameters are observed. The test results allow to conclude that it is possible to obtain a useful product that meets the requirements of environmental protection, but only after the rejection of fine fractions of the waste material.

Open access

Mirosława Bukowska, Urszula Sanetra and Mariusz Wadas

References Bukwska et al. 2000 - Bukowska M., Gawyś J., Sanetra U., Szedel D., Wadas M. 2000 - Pa­rameters of rocky raw materials and their usefulness in the construction industry (In Polish: Parametry fizyczne surowców skalnych a ich przydatność w budownictwie i drogownictwie). Gospodarka Surowcami Mineralnymi t. 16, z. 2. Bukowska M., 2012 - Susceptibility of Rock Mass to Rockburst - Geological and Geomechanical Methods of Testing (In Polish: Skłonność górotworu do tąpań - geologiczne i geomechaniczne metody badań