bluuebunny/crossref_metadata_2025 huggingface dataset:
Učenje engleskog jezika iz perspektive studenata - budućih vaspitača
Authors: Palinkašević Radmila
Published: July 2021

Starting from the hypothesis that an identification and a more detailed study of students' conceptual sphere regarding learning English language will result in mapping the fields in the tertiary-level teaching of English as a foreign language that need improvement, in the academic year 2018/19 we conducted a survey among all undergraduate students at the Preschool Teacher Training College "Mihajlo Palov" in Vršac. A total of 125 respondents filled out an anonymous questionnaire designed to reveal the source domains through which pre-service preschool teachers perceive learning English as a foreign language. A qualitative analysis of the researched corpus made it possible to single out five dominant conceptual metaphors of different source domains for the concept of English language learning. Among the obtained metaphors, special attention was given to selecting the metaphors with a methodological potential for implementation in teaching, as well as to the suggestions for modelling the so-called disruptive metaphors that have a negative effect on the English language acquisition.
To live and to learn: Practice-led learning through entrepreneurship education
Authors: Tselepis Thea , Nieuwenhuizen Cecile , Schachtebeck Chris
Published: July 2021

The aim of this paper is to propose a matrix that could guide the approaches to entrepreneurship education at tertiary level bearing in mind binary constructs such as theory-led learning versus practice-led learning, as well as different contexts such as entrepreneurship in a formal programme versus entrepreneurship in a module only. A qualitative research approach was followed to compile the matrix, using data collected from 25 students who reflected on what an ideal programme or module could have entailed and what the most meaningful activities could be for such a programme or module. The matrix proposes some insightful approaches and activities that educators may consider when refining their module outcomes and assessments.
Nacionalni identitet u udžbenicima o prirodi i društvu
Authors: Vasilijević Danijela , Semiz Marina , Bojović Žana
Published: July 2021

The paper presents the results of a research conducted with the aim of determining the contribution of Science and Social Studies textbooks in the formation and strengthening of the national identity of younger students in primary school. The theoretical part of the paper provides an overview of different conceptualizations of the concept of national identity, as well as an overview of the research on the role of program frameworks and educational content in the development of the national identity of children and young generation. In accordance with different conceptualizations, national identity has been operationalized in 11 categories: religion, customs and traditions, national feelings, language, symbols and insignia, solidarity and togetherness, cultural heritage, important personalities, geographical concepts, family, and general information. The method of theoretical analysis and the method of content analysis were applied in the research. The units of analysis are the sentences of the basic text of the textbook. The research included the Science and Social Studies textbooks in the lower grades of primary school (N = 12). The results of the research indicate that textbooks insufficiently contribute to the formation and strengthening of the national identity of the younger school-age students, in terms of all considered categories of national identity. The conducted analysis implies that it is possible and desirable to strengthen the contents of national significance and, to a greater or lesser extent, incorporate them in all thematic units, which would significantly increase the overall share of the contents on national identity.
Prevencija antisocijalnog ponašanja učenika iz perspektive nastavnika
Authors: Šaljić Zorica , Hebib Emina
Published: July 2021

Prevention of antisocial behavior of students today is a significant segment of school work. Teachers, as the bearers of all school activities, have a very important role in the preventive action of the school. Their opinions and attitudes about the ways and possibilities of prevention of antisocial behavior of children and adolescents in school are reflected in their participation in planning and implementation, as well as in the outcomes of the school preventive measures and activities. Starting from the importance of the role of teachers, we decided on a research that aimed to investigate the views of teachers on the prevention of student's antisocial behavior in school practice, more precisely, on the importance of various preventive measures and activities, the difficulties encountered in their implementation, and the opportunities for improving the preventive measures in schools. A total number of 162 teachers from 28 Belgrade primary schools participated in the research. The obtained results indicate that displaying the rules of conduct in school premises, acquainting students and parents with the rules of conduct, their rights and obligations, as well as organizing lectures on violence and the harmfulness of psychoactive substances, are the activities viewed by teachers as the most common preventive activities in school practice. Teachers also singled out thematic workshops as the activities that can give the greatest contribution to the prevention of the problematic student behavior. In contrast, they point out that the lack of parents' interest is the greatest difficulty in achieving the preventive action of the school, whereas the joint action of the key actors in the school work is viewed as one of the most important preconditions for achieving the preventive function of the school. The obtained research results indicate that in school practice more work should be done on the implementation of various preventive activities that would provide different levels and types of support to students and which would include all actors of school work.
Pravopisna norma u izdanjima Nušićevih "Hajduka" i potrebe savremene nastave
Authors: Zeljić Goran
Published: July 2021

Using the example of "Hajduci" by Branislav Nušić, as school extensive reading for the fifth grade of primary school, this paper analyzes the compliance of ten selected editions of this work with the orthographic norm that was current at the time when these editions were published. Ten editions of this work were selected, starting from the first edition (1933/34), to the most recent one (2018), aiming to cover both periods of Serbian orthographic norm - the first, Belić's period, with the editions from 1923, 1930, 1934, 1950, and the second period, of Matica Srpska orthographic norm, with the editions from 1960 (together with Matica Hrvatska), and in 1993 and 2010 whose authors are M. Pešikan, M. Pižurica and J. Jerković. In order to emphasize the importance of this analysis for teaching practice, it also includes the textbooks (readers) containing the excerpts from the novel "Hajduci". Bearing in mind that the students' language competencies in the field of grammar and orthographic norms are also developed by reading the works included in the reading lists, such as Nušić's "Hajduci", the aim of this paper is to determine to what extent, and according to which orthographic rules, the publishers of the later editions of this novel harmonised it with the current orthographic norm.
Kako učenici ocenjuju doprinos pojedinih elemenata verske nastave njihovom moralnom razvoju
Authors: Kačarić Ninoslav
Published: July 2021

The paper presents findings on the contribution of elements of religious education to moral development, in assessments of students who attend religious education, Orthodox Christians in Serbia (sample of 446 respondents representing the 7th and 8th grade of primary schools, and the 3rd and 4th grade of secondary schools). The aim of the research was to assess the assessment of students in which ways - elements of religious education contribute to the moral development. It was assumed that students have a positive opinion about the contribution of religious education to the moral development, as well as that the ways of conducting religious education, personality and approach in communication of religious education teachers (religious teachers) are important factors of moral development, and that religious education has significant place factors of moral development. Method applied in this study is systematic non-experimental observation and correlation analysis, by which were evaluated and interpreted data collected by questionnaire constructed for the occasion - students expressed their opinion on what contributed the most to their moral formation in terms of age in the faith. Among the important results are: The personality of religious teacher is of great importance and its contribution depends on his knowledge of the content transmitted to the students, and on interesting ways of teaching, by visiting Temples of the Holy Spirit and participation in church worship, while information and communication technologies are less significant. Practical pedagogical implications of these results are devoting special attention to personnel potential of religious teachers.
Art and aesthetics: Three recent perspectives
Authors: Erjavec Aleš
Published: July 2021

The author sketches the development of the relationship between art and aesthetics in the recent past. As his starting point, he takes the position that artists established in the sixties in relation to philosophical aesthetics. In his view 1980 represented a historical threshold as concerns transformations both in art and its philosophy. He then discusses three theories of art and aesthetics - Nicolas Bourriaud's "relational aesthetics" from the nineties, Jacques Rancière's aesthetic project from the following decade, and the very recent "theory of contemporary art" developed by Terry Smith. In author's opinion, these three aesthetic or art theories not only disprove the pervasive opinion that contemporary aesthetics understood as philosophy of art is once more separated from contemporary art and the art world, but also manifest their factual import and impact in contemporary discussions on art.
Architecture and philosophy: Relations, potentialities and critical points
Authors: Šuvaković Miško
Published: July 2021

In the debate "Architecture and Philosophy / the relations, potentialities and critical points" the notions of "philosophy of architecture" and "aesthetics of architecture" will be discussed. The differences between traditional and contemporary philosophy and aesthetics of architecture will be introduced. In a separate sub-chapter the status of "theory" and "theorizing" during the times of late modernism and postmodern culture will be discussed. It has been pointed to the modalities of theory outside philosophy and aesthetics. The discourses from philosophy, humanities, free theorizing and architectural theories are brought closer together. In the final sub-chapter the status of contemporary philosophy and cotemporary architecture have been discussed. The notion of contemporaneity has been particularly elaborated. The central thesis of this paper is the relation of architecture and philosophy, i.e. the theory constituent for modern, postmodern and contemporary architecture. The derived thesis of the discussion is that critical theory of architecture and architectural yearning for "critical architecture" have acquired exceptional significance at the time of global conflicts and, presently at the time of global economic crisis. The theoretical, aesthetic and philosophical attention has essentially been shifted from the immanent questions about architecture (form, function, spectacularity) to the external i.e. transcendental questions about the culture and society, i.e. about the economy, power, governance, supervision, forms of life, flexibility of architectural production, exchange and consumption.
The notion and meaning of interdisciplinarity in the studies of art and media
Authors: Dedić Nikola
Published: July 2021

This text attempts to mark the difference between traditional, modern, monodisciplinary and contemporary interdisciplinary approaches within the analysis of reception of media and artistic contents. Monodisciplinary approaches are connected with the classical basis of humanistic and social sciences which are related to the definition of culture based on opposition between mass and elite culture (art). Avant-garde and linguistic turn within social sciences in the 60s realized re-evaluation of the notion of culture-culture is not seen anymore as a sum of elite products of human spirit but rather as a production of cultural meaning, i.e. as a discourse. This turn enabled interdisciplinary turn within the sciences as aesthetics and art history and also enabled the emergence of contemporary interdisciplinary media theory.
Three sequences of site-writing
Authors: Harutyunyan Angela
Published: July 2021

The article is comprised of three exercises of "site writing" interrupted by theoretical and methodological intermissions. The sequences take the reader to a topographical and exegetical journey into various images, memory traces and narratives that treat reality as raw material for dreaming. Adopting architectural historian Jane Rendell's critical framework of site writing, the article aims at radical spatialization of the sites through which narratives emerge, memories are revisited and possibilities for the future are suggested. Site writing is not writing about spaces, but writing spaces, engaging the materiality of the images and the phenomenological encounters with them through spatiality and positioning of the images. Thus, images become sites through which the narrative unfolds. The image-sites that form the three key sequences include the juxtaposition of two towns-Kars and Giumryin Turkey and in Armenia respectively in a way that the images of the townscapes neither comment, nor repeat, but double each other; a journey through Los Angeles' Westin Bonaventure hotel and its relationship to the body and the landscape; and a reading of the latent possibilities of the material in artist Kasper Kovitz's landscape paintings and installations.
The status of aesthetics today
Authors: Erjavec Aleš
Published: July 2021

In my paper I will examine some of the turning points in recent history of aesthetics. I claim that recent developments in aesthetics have not only broadened its range of interests and made it more up-to-date vis-à-vis concurrent art, but have also taken aesthetics into realms that were previously not its own. In this respect, I see Jacques Rancière as the pivotal figure, whose recent writings offer a possible novel - although also risky - endeavor. Furthermore, I will examine some other - divergent, but also highly productive - aesthetic theories of the recent decades.
Aesthetic experience in the nature-culture continuum: The biological dimension of pragmatist aesthetics
Authors: Wilkoszewska Krystyna
Published: July 2021

In 1930 American pragmatist philosopher John Dewey introduced into aesthetics a relatively new idea of experience. Living in modern time Dewey offered non-modernist way of thinking which especially in the field of aesthetics seems to be more adequate to our time than the modern ideas of aesthetic experience and autonomy of art. After short presentation of Dewey's philosophy of aesthetics I would like to show its inner dimensions that are fully developed today: ecological, evolutionary and transhuman tendencies, experience as interaction, soma and sensuous perspective.
Form and meaning in architectural theory
Authors: Erzen-Jale Nejdet
Published: July 2021

Often architectural theory has been articulated on prescriptive views about what architecture should be, rather than on views formulated from historical experiences and examples of architecture. In this paper I will try to offer readings of architectural form by looking at a historical example from classical Ottoman architecture and at contemporary examples, to show how different architectures treat form. In examples taken from Sinan's architecture, symbols are investigated in relation to movement, to urban settlement, to religion and power. It is hoped that this analysis will offer an understanding of how the significance of architecture in human experience and in the urban context goes beyond structure and function
Paul Scheerbart and the utopia of glass
Authors: Miller Tyrus
Published: July 2021

This paper will consider the architectural writings of the German expressionist writer Paul Scheerbart, focusing on his fascination with glass as an architectural and symbolic material within his writings. I will discuss Scheerbart's architectural treatise Glass Architecture, his novel The Grey Cloth, and related writings on glass architecture. Scheerbart represents an alternative tradition within architectural modernism, which saw glass as a constructive material that represented modernity by exposing structural elements of the building, thus guaranteeing conformation of form to function. Scheerbart, in contrast, considered glass as a bearer of color and multiplier of light, which he saw as capable of transforming the human environment and exercising positive effects on individuals and collectives. He saw light as culture-formative, and glass architecture as the means by which the built environment could maximize modern culture's utopian potential. I also discuss the influence of Scheerbart on the anarchist architect Bruno Taut and on the thinking of Walter Benjamin.
Ethics of dwelling: Early Christian principles of the city life and urban transformation
Authors: Mako Vladimir
Published: July 2021

The work (paper) focuses on a particular issue regarding ethics developing in early Christian time and its influence on the process of transformation of Roman urban life, habits, functions, and architectural practice in the late fifth century and after. Complexity of this issue derives from the fact that the early Christian monastic ideals, which had been rapidly developed in the first centuries of the new era, substantially influenced the formation of everyday living ethical principles. Consequently, these new principles changed existing dwelling habits, particularly in the field of public life, demanding a new form of behavior from the Christian citizens. This process also influenced the idealistic view on what the concept of a Christian city can be, and how the new form of ethical life reflects on new urban and architectural structures.
Art, modernity, and scepticism
Authors: Dedić Nikola
Published: July 2021

The Paper deals with the problem of relation between art and modernity-our main thesis is that the artist in an age of modernity deals with the problem of privacy. The notion of privacy is used in Wittgenstein's sense, as analogy to his theorization of fantasy of private language. His concept of private language is a description of withdrawal of ordinary language from the process of inter-social relations and its everyday use; in that way, private language fantasy is a kind of scepticism. Regarding the fact that the notion of epistemological scepticism is connected to the idea of modernity (Descartes', Hume's, Lock's modern sceptical subject), the main problem for modern artist is how to transcend the condition of radical scepticism, i.e. the condition that Stanley Cavell, in Wittgenstein's sense calls "metaphysical isolation".
From transcendental idealism to transcendental empiricism and beyond: Kant, Deleuze and flat ontology of the art
Authors: Filipović Andrija
Published: July 2021

In this paper I will show that the movement from Kant's transcendental idealism to Gilles Deleuze's transcendental empiricism and then to new materialisms and speculative realisms is what enables us to talk about the direct and non-mediated access to the thing in itself (or its dissolution). In other words, it's the change from the conditions of possible experience to the conditions of real experience that made possible current philosophical and theoretical discourses of materialisms and realisms. What is of particular interest for the purposes of this paper is how the change from conditions of possible to real experience relates to the current conceptualizations of art practices. More precisely, I will show how the ontology of art changed, or at least that there perhaps appears paradigm-shifting possibility of different aesthetics and ontologies of art, flat ontology being one of them, with the appearance of new materialisms and speculative realisms that were made possible by the change to the conditions of real experience.
Representation and identity issue between globalism and localism: The case of Hong Kong pavilion at the Venice Biennale
Authors: Kit Wah
Published: July 2021

In this presentation Lee Kit's art installation at the Venice Biennale in 2013 is used as a case study of the ways in which artworks represent and help to construct representations of Hong Kong's challenge to and subversion of an aggressive and powerful rising China. In contrast with the explicit social critique and grandeur of artworks exhibited in the China Pavilion, Lee Kit's art installation - "an impressionistic house" - in the Hong Kong Pavilion appears not only abstract but mundane and even trivial. As the artist was handpicked by the organizer, without any prior public consultation, there has been heated public debate on the extent to which it is representative of Hongkongness. I argue that the apparently trivial and ordinary elements of Lee's work constitute rather than reflect the new generation of Hong Kong art. These elements may also be part of a strategy for negotiating the political identity inescapably imposed on Hong Kong by China. Hong Kong art now has the potential to distance itself from or express skepticism toward the grand narratives presented by China, to paraphrase the writing of art historian David Clarke (1997). I believe part of the aims of the international conference on "Hong Kong as Method" held at the University of Hong Kong in December 2014 is to use the ordinary to destabilize and challenge Hong Kong's taken-for-granted political identity and thereby promote diversity and inter-Asian cultural dynamics.
Contemporary Chinese art: Mao's legacy and Danto's definition
Authors: Bittner Wiseman
Published: July 2021

In this paper I am going to do three things: First, identify several themes in contemporary Chinese art that show its essentially social nature and its robust materialism. Second, suggest a way that contemporary art in China is post-modern in the way that Western art is and claim, moreover, that as different as the themes and recent history of this art are from contemporary Western art, the works satisfy a definition of art constructed by Arthur Danto. Finally, in a coda, I present the work of a woman artist that is unlike most recent Chinese and Western art. It positions itself at the far reaches of what art in China is and what Danto's definition allows at the same time that it suggests both the interiority of the practice of art and one way of being a woman.
Architectural hybrids in kaleidoscopic photography
Authors: Romakina Maria
Published: July 2021

This paper focuses on the topic that is somehow a crossroad between two fields: photography and architectural morphogenesis. The particular interest of the article is contemporary photographic tendency to explore the kaleidoscopic technique and aesthetics in relation to the architectural objects and urban environment. Paradoxically these are the photographers who investigate this special type of morphogenesis of architectural form. However some of them are architects originally. Giving attention to the historical and evolutional aspects of the kaleidoscopic image in 19th century and kaleidoscopic photographic practices of American artist Alvin Langdon Coburn and his followers in 20th and 21th centuries the paper aims to analyze the potential of photography in developing the architectural form by examples of projects of Mattia Mognetti, Borbála Sütő-Nagy, Cory Stevens, Stéphane Laniray, Panos Papanagiotou, Andrey Chegin, Mohammad Domiri and those photographers who were inspired by camera work from the movie "Inception"-Ben Thomas, Kazuhiko Kawahara, Simon Gardiner, Nickolas Kennedy Sitton.
Scale on paper between technique and imagination: Example of Constant's drawing hypothesis
Authors: Bnin-Bninski Anđelka , Dragišić Maja
Published: July 2021

The procedure of scaling is one of the elemental routines in architectural drawing. Along with paper as a fundamental drawing material, scale is the architectural convention that follows the emergence of drawing in architecture from the Renaissance. This analysis is questioning the scaling procedure through the position of drawing in the conception process. Current theoretical researches on architectural drawing are underlining the paradigm change that occurred as a sudden switch from handmade to computer generated drawing. This change consequently influenced notions of drawing materiality, relations to scale and geometry. Developing the argument of scaling as a dual action, technical and imaginative, Constant's New Babylon drawing work is taken as an example to problematize the architect-project-object relational chain.
Transformation models of unused spatial resources: Research study of Cultural Center "Magacin" in Belgrade
Authors: Pantović Ksenija , Čukić Iva
Published: July 2021

This paper researches different transformation models of unused spatial resources in order to recognize aspects which could lead towards a sustainable activation of space. The relevance of the research lies in both scientific interpretations, and the clarification of the transformation phenomenon relating to the activation of unused spatial resources, especially in the context of post-socialist Serbia with a focus on its capital. The theoretical framework of the research relates to different aspects of urban sustainability regarding the activation of unused spatial resources, including further clarification of the role of the transformation principles in architectural discourse. The empirical part of the research regards a case study analysis of the precise spatial framework of "Magacin" Cultural Center in Belgrade using a student involved workshop as a research method. The students were expected to explore different possibilities and propose design solutions for the given space applying a transformation method in the context of space activation. The final part of the research includes the synthesis and the result interpretation regarding the research context and the problem setting, but more importantly, it demonstrates the level of interdependency between changes on micro-level (transformation models of unused spatial resources) and the context of macro-level (activating space in terms of sustainable urban development).
Relational logics and diagrams: 'No-scale conditions'
Authors: Ćirić Dragana
Published: July 2021

The paper investigates logics of relational thinking and connectivity, rendering particular correspondences between the elements of representation and the things represented in drawings, diagrams, maps, or notations, which either deny notions of scale, or work at all scales without belonging to any specific one of them. They include ratios and proportions (static and dynamic, geometric, arithmetic and harmonic progressions) expressing symmetry and self-similarity principles in spatial-metric terms, but also principles of nonlinearity and complexity by symmetry-breakings within non-metric systems. The first part explains geometric and numeric relational figures/sets as taken for "principles of beauty and primary aesthetic quality of all things" in classical philosophy, science, and architecture. These progressions are guided by certain rules or their combinations (codes and algorithms) based on principles of regularity, usually directly spatially reflected. Conversely, configurations representing the main subject of the following sections, could be spatially independent, transformable, and unpredictable, escaping regular extensive definitions. Their forms are presented through transitions from scalable to no-scale conditions showing initial symmetry breakings and abstractions, through complex forms of dynamic modulations and variations of matter, ending with some of the relational diagrammatic and topological ways of architectural data-processing outside of the spatial constraints and parameters - all through diagrams as ultimate tools of relational thinking and inference.
Physical, chemical, and antioxidant stability studies of a topical formulation containing pot marigold (Calendula officinalis L.) flowers extract
Authors: Savić Ivan , Savić-Gajić Ivana
Published: July 2021

Pot marigold flower extract (Calendula officinalis L.) has pharmacological properties due to the presence of various bioactive compounds. It is known that the extract has antioxidant, anti-inflammatory, antitumor, antibacterial, antifungal, antiviral, antimutagenic, antidermatitis properties, etc. The aim of this study was to improve the quality of the selected topical formulation by adding the ethanolic extract of pot marigold flower, as well as to monitor its stability. The topical formulation was water-in-oil emulsion prepared using the hot/hot emulsification process with an oil phase consisting of Vaseline, lanolin, and almond oil. The extract, prepared by ultrasound-assisted extraction, had an antioxidants content of 3.512 g gallic acid equivalent per 100 g-1 of dry weight and the half-maximal inhibitory concentration of 0.14 mg mL-1 determined by the DPPH assay. Chemical stability studies have shown that daylight has no significant effect on the stability of antioxidants in the extract, while an increase in temperature leads to their degradation. The shelf-life of the extract is about 8 months at 4 °C and 3 months at 22 °C (room temperature). The prepared uncategorized topical formulations containing 1% and 2% (w/w) pot marigold extract were stable at different temperatures during the storage. The uncategorized formulations showed antioxidant activity, but the activity of the extract in the formulations decreased with increasing storage temperature. Pot marigold flower extract and the developed uncategorized formulations showed an inhibitory effect on Gram-positive (Staphylococcus aureus) and Gram-negative bacteria (Escherichia coli, Proteus mirabilis, Klebsiella pneumoniae), as well as on Candida albicans. The uncategorized formulations with this activity can be used in the treatment of skin infection.
Synthesis and characterization of pH-sensitive saccharide modified Polyurethane hydrogels: Effect of polyol, crosslinker and acid chain extender
Authors: Kostić Marija , Cakić Suzana , Ristić Ivan , Marinović-Cincović Milena , Nikolić Ljubiša , Samaržija-Jovanović Suzana
Published: July 2021

Biodegradable polyurethanes can be the basis for drug delivery systems that are sensitive to external changes. pH-sensitive polyurethanes (PUs) have been used successfully as intravaginal rings and specific drug delivery systems for the colon. In this study, a series of pH-sensitive polyurethane hydrogels with a change of the polyol component (poly(ethylene glycol) 400/poly(propylene glycol) 2000/poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) 1100), saccharides as crosslinkers (melibiose/raffinose/starch) and a-hydroxy carboxylic acids as chain extenders (dimethylol propionic acid/lactic acid) were synthesized. Structural characterization of the synthesized polyurethane hydrogels was performed using Fourier transform infrared spectroscopy (FTIR), which showed that the polyurethane synthesis reaction was achieved with successful crosslinking with saccharides and, despite the change of starting components, FTIR spectra for all investigated samples are almost identical. The degree of swelling of the hydrogels was monitored at 25 °C in solutions of pH values 4.5 and 7.4. In samples with the polyol component block1100, the degree of swelling at pH 7.4 (16.09%) was up to 9 times higher than at pH 4.5 (1.82%). The effects of variable parameters on the thermal properties and phase transitions of PUs hydrogels were investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results showed that by varying the saccharide as a crosslinker, the acid chain extender and the chain length of the polyols, the stated properties of polyurethane hydrogels as potential drug delivery carriers can be influenced.
Influence of additives on suspension structure
Authors: Savić Vesna , Martinović Milica , Nešić Ivana , Živković Jelena , Gajić Ivana
Published: July 2021

The aim of this study was to compare the stability and texture of three zinc oxide suspensions with different additives. Suspension 1 was made as official magistral formulation Suspensio album 7.5% from Formulae magistrales 2008. Suspension 2 was prepared when 1% carbomer gel was added to suspension 1 and suspension 3 was prepared when polysorbate 20 was added to suspension 2. After stability tests, texture analysis was performed on all suspensions. Following parameters were measured: hardness cycle 1, hardness cycle 2, cohesiveness, adhesiveness, resilience and springiness. The study showed that suspension 3 had the lowest value of hardness, and therefore the best spreadability. Also, suspension 3 was the least sticky of all three, since it was characterized with the lowest adhesiveness. Further, suspension 3 was the most cohesive and is predicted to withstand the stress during packing and use longer than others. On the other hand, the highest values of resilience and springiness were detected for suspension 1, while the lowest was related to suspension 2. Therefore, the best textural characteristics were assigned to suspension 3. This result is in accordance with the results of performed stability tests. The results of our study offer insight into potential improvements of the current magistral formulation Suspensio album 7.5%.
Optimization of the synthesis parameters of nanocomposites based on bacterial nanocellulose/Fe3O4
Authors: Janićijević Aleksandra , Sknepnek Aleksandra , Mirković Miljana , Pavlović Vladimir , Filipović Suzana
Published: July 2021

Development in many areas of engineering and technology are closely linked to the development of new or improvement of existing materials. Having in mind wide use of bacterial nanocellulose (BNC) in various areas of everyday life, from biomedicine, ecology to electronics, BNC-based composites are becoming widely used and attracting the attention of the scientific community. It is especially important to examine in detail the synthesis parameters that affect the changes in the crystal structure and morphology of the obtained composites, having in mind that these changes have a crucial influence on their final functional properties. In this paper, a composite material based on bacterial nanocellulose BNC (as the matrix) and ferromagnetic Fe3O4 was studied. BNC was obtained by the activity of acetic fermentation bacteria after 7 days of growth in a suitable medium. The research is aimed to optimization of the Fe3O4 precipitation conditions. It's especially considering the time interval of BNC films spend in the iron salt solution. The influence of the performed synthesis conditions was considered by the SEMEDS, FTIR and XRD methods.
Impact of green roofing on the energy performance of a residential building with a sunspace
Authors: Vukadinović Ana , Radosavljević Jasmina , Đorđević Amelija , Petrović Nemanja
Published: July 2021

The construction of green, or vegetated roofs, can mitigate the heat island effect, reduce the energy required for cooling of buildings, allow for efficient precipitation management, improve air quality, increase biological diversity, reduce noise, etc. This paper uses the method of dynamic simulation to investigate how different green roof types influence the energy properties of an individual residential building with a sunspace located in the city of Niš. The obtained results show that when the extensive type of green roof is used on the model of the building with a sunspace, there are no significant changes in the required energy for heating or cooling. The biggest reduction of the energy required for heating and cooling occurs when an intensive green roof is used. In the subvariant of the model with an intensive green roof, the required energy for heating was 0.34% lower while the required energy for cooling was 2.32% lower compared to the model of the building without a green roof
Suitability of aggregates gradation for base and subbase layers of pavement
Authors: Nikolić-Ivanović Marijana , Đokić Olivera , Milićević Vladimir , Stefanović Suzana , Milić Bratislav
Published: July 2021

The assessment of the suitability of the granulometric composition of the crushed stone aggregates (CSA) for an unbound base and subbase layers of pavement, in the Republic of Serbia is done based on the defined gradation bands, uniformity degree (Cu), coefficient of curvature (Cz), percentage of fines and percentage of particles passing a 0.02 mm sieve. On the other hand, standards which define the quality requirements of aggregates and unbound mixtures for road construction SRPS EN 13242 and SRPS EN 13285 introduce a significantly different approach to the assessment of the granulometric composition suitability. Categories are defined. Each category includes a particular boundary band, tolerances on sieves, differences in values passing each sieve. The categories are defined depending on the field of the application. For seven CSA 0/31.5 mm used for the construction of Corridor XI, a comparative analysis of the granulometric composition suitability was performed according to the requirements of the existing Technical Specifications (TS) of PE "Roads of Serbia" (PERS) and the specified SRPS EN standards. The analysed curves satisfy those technical requirements, but vary in categories from the most severe mixtures of the normal granulometric composition of the GA category, to the open mixtures of the GP category. It was concluded that the principle based on the defining allowed tolerances on the sieves and between the sieves, is more suitable for field control of of the granulometric composition and the good granularity of the aggregates. Technical Specifications should be modified to this approach.
Coating based on basalt protection metal structures
Authors: Pavlović Marko , Dojčinović Marina , Andrić Ljubiša , Radulović Dragan , Trumbulović Ljiljana
Published: July 2021

The paper present the results of the synthesis of a new refractory coating based on basalt for the protection of metal construction under conditions of cavitation. Initial basalt samples obtained from the locality Vrelo - Kopaonik. The basalt based refractory filler was obtained by crushing and grinding selected samples of basalt rock. XRD, SEM and optical microscopy methods were used to characterize the obtained filler samples. The research defined the composition of basalt -based coating with epoxy resinbased binder, organic additives and organic solvent. The resistance properties of protective coatings applied to metal surface were investigated using the ultrasonic vibration method with a stationary sample according to the ASTM G 32 standard. To evaluate the resistance of the sample surface to the action of cavitation, the sample surface was examined before and during testing. The surface of the samples was monitored by scanning electron microscopy in order to analyze the morphology of surface damage. Computer image analysis according to the Image Pro Plus program was applied to assess the damage to the sample surface. The obtained test results showed high resistance of the coating layers to the effect of cavitation, with small mass losses, small damage to the coating surface and a cavitation rate of 0,1 mg/min.
Configuring a virtual prototype of a BiSCARA robot
Authors: Slavković Nikola , Živanović Saša , Vorkapić Nikola
Published: July 2021

The paper presents the configuring of a virtual prototype BiSCARA robot generated on the basis of a fully developed kinematic model of the robot. The virtual CAD model developed in this way will enable its implementation in the Python graphical environment as an integral part of the open architecture control system developed on the basis of the presented kinematic model. The developed kinematic model included solving the inverse and direct kinematic problem, determining the Jacobian matrix and workspace analysis. Verification of the kinematic model, i.e. the configured virtual prototype of the robot, was performed by simulations of the end-effector tip movement according to the given program in a CAD / CAM environment.
Summary determination of velocity and acceleration in the dead position of four-bar mechanism by the stopping method
Authors: Ljubomirović Miloš , Ljubomirović Dragan
Published: July 2021

The paper studies a plane four-bar mechanism in a dead, kinematically indeterminate position. From that position, the mechanism could continue to move, continuously, or the driven lever would stop and move backwards. But, if we eliminate this second possibility, the position of the mechanism is no longer indeterminate and it would be logical that we can determine unknown speeds and accelerations by some kinematic method. The authors of this paper, applying the stopping method, came up with analytical expressions for determining unknown velocities and accelerations in the dead position of an four-bar mechanism.
Evaluation of vehicle parameters depending on technical vehicle inspection
Authors: Dedović Vlastimir , Božanić Vojislav , Božović Milan
Published: July 2021

In a strategic document of EU for Road safety improvement, up to 2030, "safe vehicle" is recognized as one of the pillars of a stable Road safety system. The part of the "safe vehicle" pillar is technical vehicle ispection, where parameters important for road safety are periodically checked. The aim of this work is to determine the quality of the measurement data and the ability to repeat measurements of some parameters during technical vehicle inspection, or more precisely, to determine whether measured data of turning wheel resistance and brakes ovality differ depending on the inspection place. The research is done by inspecting ten vehicles at five inspection places with different levels of resources use. The results show that the spread of measured data of turning wheel resistance is statistically significant and that it depends on the inspection place, as well as that measured data of turning wheels resistance significantly vary between inspection places. The measured percentage of brakes ovality is different from one inspection place to another, but the differences are statistically significant only for right wheels. The impact of inspection place, although less than in turning wheel resistance measurement, is still significant.
Integrated risk management model implementation's contextual dependence on company size
Authors: Alherian Nuri , Spasojević-Brkić Vesna , Perišić Martina , Alsharif Abdulghder
Published: July 2021

Novel integrated risk management model for standardized management systems, such as ISO 9001:2015 for quality management systems, ISO 14001:2015 for environmental management systems, ISO/IEC 27001:2013 for information security management systems, ISO 45001:2018 for occupational health and safety management systems, and ISO 22000:2018 for food safety management systems, has been proposed in order to enable that organizations can manage their processes and associated risks versus requirements of each internal and external stakeholder, due to the fact that those models rarely exist in literature. Proposed model consists of three levels - correspondence, coordination and integration and put in place a clear and structured approach to controlling organizational risks. Using sample of 30 Serbian companies the proposed model has been checked empirically to contextual independence of proposed model using Mann-Whitney U*test and it has been proved that model is context free and applicable to companies different in size since there were no differences between micro & small vs. medium & large companies. Limitation of this research for sure is the sample size, so its extension is recommended. Further recommendation for future research is also a more detailed analysis on collected data done by using more sophisticated statistical analysis tools, such as regression analysis, structural equations modeling and similar to see interrelations between variables in the proposed model.
Differences between standards related to fire protection systems design
Authors: Jevtić Radoje
Published: July 2021

Fire protection and design of fire protection systems present very important engineering tasks in protection of human lives, animals and material properties. Because of its great significance, everything in fire protection and fire protection systems design must be defined by appropriate standards. There are several different standards in use in different countries around the world. Very often, in solvation of different fire protection tasks, there are many questions asked which standard should be used. There are many similarities between standards, but there are also many differences between standards. Also, some standards don't define at all some cases that can be found in fire protection. This paper was written to present solutions for some particular tasks by some valid standards (EN 54, BS, NPB 88-2001, VDE 088-2 and NFPA 72) in fire protection and differences between them in the same cases.
Comparasion between European elite senior and junior female table tennis players: Rally length and serve-receive game
Authors: Davide Luini , Fuchs Michael , Đokic Zoran , Malagoli Lanzoni , Munivrana Goran
Published: July 2021

The aim of the study was to compare elite junior and senior women table tennis players, using three parameters of the table tennis: rally length, serve and receive analysis. Twenty-five junior and twenty-five elite senior matches were analysed (total: 263 sets and 4958 points) between players ranked in Top 25 in ETTU rankings in the last two years. All the athletes used an offensive style of play. The results of non-parametric Mann-Whitney U Test, showed a significantly higher rally length in senior compared to junior category (4.46 vs. 3.93). Moreover, the results of Pearson's Chi-square tests show an association between the age categories and selected parameters (laterality, technique and placement) for both serve and receive. Different behavior between the two categories was noted. The senior players used more the flip technique (22.2 % vs 14.7 %) and short push to return the services of the opponents (32.5 % vs 26.0 %). These results provide useful information to analyze junior players' behavior compared to the senior players in order to plan specific training sessions. It can be also useful to identify some parameters as predictors of the future success for junior players.
The importance of monitoring saturated oxygen values in hemoglobin in the sports diagnostics
Authors: Međedović Bojan , Plećaš Jovan
Published: July 2021

Cardiorespiratory performance is one of the most important determinants of success in sports activities. In order to better prepare for sports challenges, the athletes must be exposed to appropriate training which should be based on individualized physiological parameters during activity. Even though training intensity can be determined in many different ways, the endurance training intensity is often quantified by the lactate thresholds obtained from the blood sampling or the ventilator thresholds obtained from the gas exchange. These data represent delayed indirect indicators of an increased anaerobic ATP resynthesis. The muscle oximetry, based on near-infrared spectroscopy (NIRS), represents non-invasive method that enables the information about the changes in oxygenation in hemoglobin, and potentially represents a very suitable technique to detect a critical exercise threshold directly in the exercising muscle.