38 results on '"Ćorić D"'
Search Results
2. Postoperative troponin measurement as a screening tool for adverse cardiac events in adult patients undergoing moderate or major non-cardiac surgery
- Author
-
Coric, D and Smith, NA
- Published
- 2017
3. An experimental–numerical study of moisture absorption in an epoxy
- Author
-
Lai, M., Botsis, J., Cugnoni, J., and Coric, D.
- Published
- 2012
- Full Text
- View/download PDF
4. Monitoring of non-homogeneous strains in composites with embedded wavelength multiplexed fiber Bragg gratings: A methodological study
- Author
-
Schizas, C., Stutz, S., Botsis, J., and Coric, D.
- Published
- 2012
- Full Text
- View/download PDF
5. A dispute about gender-sensitive language in Serbian law
- Author
-
Ćorić Dragana M.
- Subjects
gender ,sex ,gender-sensitive language ,disputes ,Law - Abstract
Gender-sensitive language is considered as one of products of the heroic struggle of women to be recognized and respected in modern world, for all what they are and for all what they could be and could achieve. This means that women are not escaping from their natural, biological roles -especially mother's role and other cherishing, nurturing and gentle emotions they have and use in raising the children and keeping the family on the same spot. This means that it should make men to find them, on linguistical and more over on other levels, equally capable of doing all sorts of jobs they are doing themselves. The newly changed national legal framework makes use of gender sensitive language as obligation since May 2024. All governmental bodies, on any territorial level, journalists, children and teachers at schools etc. will be obligated to use those gender sensitive terms , especially when they are used to mark woman in special profession(for example, in judiciary, in area of national security and defense, etc.) or else will be fined. In this paper the author will deal shortly with both argumentations-pro and contra of using gender sensitive language, and also to present own opinionwhich is in the middle. Also, it will be presented one of the disputes in area of protection of human rights. The dispute is about whether all protectors of citizens' rights should be called-ombudsman, as the original name of this institution is, or ombudswoman, when marking the woman who serves on this position, or ombudsperson-as gender neutral, or else.
- Published
- 2024
- Full Text
- View/download PDF
6. 415 - Hematopoietic Stem/Progenitor Cells and Engineering: Late Breaking Abstract: ONE YEAR CLINICAL RESULTS IN DOUBLE-BLIND PLACEBO CONTROLLED STUDY OF DISC PROGENITOR CELL THERAPY
- Author
-
Erickson, I., Heaton, W., Gornet, M.F., Beal, D.P., Davis, T.T., Coric, D., LaBagnara, M., Krull, A., Depalma, M.J., Hsieh, P.C., Mallempati, S., and Foley, K.T.
- Published
- 2022
- Full Text
- View/download PDF
7. Academic integrity: Concept, content and ways of violating it
- Author
-
Ćorić Dragana M.
- Subjects
integrity ,academic integrity ,university ,Law - Abstract
Academic integrity is one of the most important pillars of higher education. It unites in itself the demand for perseverance and honesty in research that contributes to the development of science; request for collegial appreciation and respect for the work of members of the academic community, without discrimination, disparagement or denial of academic freedoms; request to spread a good ethical example of work and success only on the basis of honorable, honest and persistent work; and the requirement to accept minimum standards of ethical behavior that should protect all members of the academic community. Academic integrity, because of all the above, goes beyond its own concept and must be a way of life for the members of the academic community. As a result of an analytical and comparative (and somewhat critical) review of the concept of academic integrity, mainly in the domestic scientific community, certain recommendations for harmonizing the definitions and scope of the concept of academic integrity emerged.
- Published
- 2023
8. Critical evaluation of indentation fracture toughness measurements with Vickers indenter on yttria-stabilized zirconia dental ceramics
- Author
-
Ćorić, D., primary, Majić Renjo, M., additional, and Žmak, I., additional
- Published
- 2017
- Full Text
- View/download PDF
9. Properties of biocomposites from waste seashells and poly(methyl methacrylate)
- Author
-
Žmak, I., primary, Ćorić, D., additional, Surjak, M., additional, and Žalac, E., additional
- Published
- 2017
- Full Text
- View/download PDF
10. Do we need more precise methodological rules for writing regulations?
- Author
-
Ćorić Dragana M.
- Subjects
language ,methodological rules ,regulations ,Law - Abstract
In order for language to be fully accepted as a goal of communication, it is necessary that "participants have the same code, ie. a system of signs or symbols on the basis of which they compose messages. "Communication flows smoothly when all parties in the process know equally well the code that is used in communication. Sometimes, the code used in the preparation of messages differ from the code known to other participants on the other side of the communication process. Communication becomes fuzzy and one-way and must be brought to a state of unambiguous code used for both preparing and receiving messages. In the process of writing regulations, different language codes are used: the one known to everyone, that is, mostly known to everyone, and the other, which is composed of professional terms and terms from foreign languages. The terms from this second code must necessarily be explained by the terms from the first code, that is better known and more frequently used code, since the regulations are also written for a wider circle of people, not only for lawyers who know the second code better. Due to linguistic, but also structural and logical challenges that arise in the process of writing regulations, in 2010 the Unified Methodological Rules for Writing Regulations were adopted. This act regulated in the most precise way, the way of writing regulations so far, their internal structure, and also insisted on determining a unique writing style and terminology that will be used when writing legal acts because of the variety of addressees to which the regulations refer. In our paper, we consider the possible need for change, ie even greater linguistic specification of some provisions of this regulation, in the context of the role and significance of language in law. All our proposals stem from the well explained challenges that modern legislation has been facing lately in the process of its creation and self-application.
- Published
- 2021
- Full Text
- View/download PDF
11. Load dependence of the apparent Knoop hardness of SiC ceramics in a wide range of loads
- Author
-
Majić, M., primary, Ćurković, L., additional, and Ćorić, D., additional
- Published
- 2011
- Full Text
- View/download PDF
12. About the Plain English movement
- Author
-
Ćorić Dragana M.
- Subjects
plain english ,law making ,simplicity ,precision ,intelligibility ,Law - Abstract
Creating law is a complex process. It stems from the constant learning and refinement of knowledge of law - both theory and practice; from recognizing social reality and attitudes and intentions of members of society, but also knowing the state itselffrom the inside. The ultimate outcomes of the process of creation of law are "sent" to ordinary citizens, in order to understand them and act according to their content. If we translate the result of this process of law-making into clear, precise and common language written rules of conduct that the average citizen can quickly understand, both the law-making process and its results will be more acceptable to end-users. The use of specific legal terminology or other professional terminologies in the legal acts and rules governing the relations between the addressees need not necessarily be the sole and exclusive channel of communication between the law makers and the addressee. Domestic best-known law theorists constantly emphasize the need ofuse everyday, lively, folk language, with properly "dosed"use of professional terminology,with appropriate" translation "of the same terminology in every act into the everyday language of the average person. Only in this way, law will become more understandable, more accepted by the addressee and more respected in the society. In this paper, we introduce the Plain English movement, inspired by use of the simple vocabulary when writing legal acts (only in English-speaking countries). The recommendations and guidelines that prominent representatives of this movement make to their lawyers can be applied also in our, domestic law and in the process of creating our law.
- Published
- 2020
13. The standpoint of Arthur Kaufman about relationship between law and language
- Author
-
Ćorić Dragana M.
- Subjects
arthur kaufman ,law ,language ,legal language ,Law - Abstract
In our work, we briefly present the standpoint of German author Artur Kaufman about the relationship of language and law, which at one point was also defined as "the constituing of law through language." Considering that there is no law until the language gives it the proper form, Kaufman took a slightly different standpoint from other authors regarding the relationship of language and law, and also regarding the existence of a legal, special language itself. Because Kaufman's opinion about this issue was rarely and specifically mentioned, we considered it extremely important, in the context of the development of thought on the relationship of language and law and their mutual influences, and because this question involves not only lawyers and linguists, but also philosophers, sociologists and other experts.
- Published
- 2019
14. The significance of language for law
- Author
-
Ćorić Dragana M.
- Subjects
law ,language ,linguistics ,communication ,language of law ,Law - Abstract
The form of a legal act is determined by the competent body that adopts it, the appropriate procedure in which it is adopted, and the form of the act in which it is adopted. The content of any legal act must be, at least at the level of apstraction and the content of the act, in line with the content of an act that has a higher legal force, either because of the higher position on the hierarchical scale of legal acts due to the competent body that adopts it, or because other act is of special nature and content and derogates this other. However, neither the respect of the requirements of the form, nor the printing of the contents of a legal act are possible without the use of language. In this paper, under the term 'language' we mean the ability of a man to communicate with other people in his own environment, through a special system of verbalized characters, thus forming his own thoughts into appropriate voice/ written messages. Language is also taken in this paper as communication between the legislator and other legal entities and citizens, in the form of orders, declarative statements, prohibition, etc. in such a way that the content being communicated is clear and understandable to the addressees, who are mostly not legally educated. Some authors consider that only lawyers emphasize the significance of the language for law, as well as the significance of language for the specific legal language and legal terminology, while linguists remain strictly within their own science, dealing with the structure of language, the types of words and often by defending the mother tongue from the influence of foreign words at all costs. We agree with the thought of Nikola Visković that it is necessary to study the life of law ,and parallel with this, we also must study the language, which plays a key role in the life of law. In this paper we deal with the views of (mostly domestic) lawyers on the importance of language for law during the second half of the 20th century, while having in mind, at the same time, the views of the most important domestic and foreign linguists on the same topic.
- Published
- 2017
15. Discussions about unification of Yugoslav law in 20. century: The role of language and national spirit in nomotechnics
- Author
-
Ćorić Dragana M.
- Subjects
national spirit ,regulations ,language ,Law - Abstract
To preserve the national spirit, whether in the people in one country, whether in society, or in law, is a great and very responsible job to do. In times of chaos, creating a new future for one new country, may make that assignment difficult. Having all that in mind, and putting it into a context of creation of law, we must say that preserving the national spirit, even with using the own national language, could be even more difficult. In this paper, the author reveals what were stands of some prominent Yugoslav lawyers and politicians during the first half of the 20th century ( Toma Živanović, Živojin Perić, Đorđe Tasić, Slobodan Jovanović; Lujo Bakotić, Nikolaj Pahorukov and many others), regarding the unification of Yugoslav law, and the reception of foreign laws in this legal system. During this period, the newly formed country, formed after The First World War, was facing with a lot of challenges, such as understanding and accepting of new Yugoslav national spirit, fight for forming new national law and breaking all connections that it has with some other foreign wars, fight for preserving its own, particular national spirits, etc. Debate lasted for almost three decades; also some historians, journalists and writers were involved in this debate (Vladimir Ćorović, Isidora Sekulić, and others ), but it seems that it wasn't that fruitful as one might expect it. Many of them weren't ready for compromises, and were pleading either for national purity of law, either for complete takeover of foreign law- it was considered for better law just because it was-foreign. The Austrian law had the greatest influence on particular national laws, and even on forming some parts of Yugoslav law, besides French and German laws. But, something that the author calls 'linguistic patriotism' had greater influence on forming new law, and made this theoretical debate greater , improving it even from the political, social and other points of view. In this paper, the author reveals the essence of 'linguistic patriotism', in order to begin broader debate about it in further papers.
- Published
- 2016
- Full Text
- View/download PDF
16. Introduction to computer ethics
- Author
-
Ćorić Dragana M.
- Subjects
computer ethics ,Law - Abstract
Ethics is becoming one of the most often used but also misinterpreted words. It is often taken as an additional, corrective parameter to the policies and strategies that has to be adopted in the area of political works, environment, business, and medicine. Computer ethics thus makes the latest ethical discipline in the scientific sky. But its roots, as it was the case with environmental ethics, ranging decades; only the speech and the use of the same, as well as discussions on the postulates of computer ethics, are the results of rapid IT development in the last decade or two. In this paper, according to the title, will be shown introduction to computer ethics-its basis, the most important representatives, as well as the most important succession.
- Published
- 2015
- Full Text
- View/download PDF
17. Some modern ethical dilemmas regarding the use of the Hippocratic oath
- Author
-
Ćorić Dragana
- Subjects
the Hippocratic Oath ,ethics ,Law - Abstract
History of the mankind knows different oaths, which in their original forms, or somewhat modernized, have survived strict church courts, absolutist monarchy, despotic regimes, but even survived the people themselves. Beside the Hippocratic Oath, which, it seems, is the most durable and most disputed, we also know for: oath of office ,the oath for citizenship, the oath which we take 'under the penalty of criminal, civil and moral laws.' However, the subject of our discussion will be only the first-mentioned Hippocratic oath, because of the numerous controversies caused for centuries in terms of its origin, authorship, authenticity on the one hand, and its importance while entering the medical profession, on the other hand.
- Published
- 2014
- Full Text
- View/download PDF
18. About ecofeminism: As a part of environmental ethics
- Author
-
Ćorić Dragana
- Subjects
ecofeminism ,domination over women ,domination over the nature ,patriarchal approach ,earth democracy ,Law - Abstract
Women and nature are connected in many different ways : because of their biological status , reproductive status, discrimination by the ' strong '; even the ways in which women are victims of violence ( in any form ) and oppression is similar to the ways that the nature is victimized. Ecofeminism is an environmentally - ethical concept, that is not only trying to find the causes of the destruction of the environment and to ' treat ' the effects , but also tries to solve the problem that led to the cause. The representatives of ecofeminism think that changing positions and behaviors, ie. leaving the patriarchal approach to everything - can stop the degradation of the environment. The term of ecofeminism was first coined in 1974. Having in mind all conceptual wandering, binding this theory only for The Third World women ( and children) and their sacrifice within the modern system, we can conclude that ecofeminism can be very suitable to teach us to respect all the cycles of life, and not just only human life , and also can teach us how to 'celebrate all forms of diversity and to enrich the quality of life.' Feminist thought has brought a new view on ecological thinking and on traditional social and ethical perspectives. Only the abolition of domination over women , may revoke the domination and destruction of nature, since they are, in the view of some authors, homogeneous phenomenon.
- Published
- 2013
- Full Text
- View/download PDF
19. Glosa about political ethics
- Author
-
Ćorić Dragana
- Subjects
ethics ,politics ,Law - Abstract
Debates about political ethics aren't new. They have been present since ancient Greek philosophers. Machiavelli set some new principles, regarding amoral behavior of the prince, which could be quite legitimate and legal. He didn't invented anything new, he just admitted that, that was the reality. Some modern authors think that ethics and politics should be departed always, some other think that they should cooperate. In the end of the day, the voters are those who must face with amoral behavior of politicians, because it seems that politicians don't recognize ethics at all? Or is it just look like? In this paper, we will try in short to tell something about origins of political ethics, its burning issues, and about possible ways of implementation of political ethics and its development.
- Published
- 2013
- Full Text
- View/download PDF
20. Environmental ethics: Definition, history and ways of development
- Author
-
Ćorić Dragana
- Subjects
environmental ethics ,ecology ,Law - Abstract
Although we think that environmental ethics is something new to our world, and that it exists for past 20 or so years, the truth is much different. Debates about this issue last for few decades and first mentions about ecology and protection of the environment are known for a very long time, centuries ago. The environmental ethics was deprived, and not respected, although its significance for the well-being of all the humans is bigger every day. In this article, we give a short overview on some of the most prominent definitions, theories and ways of developing the environmental ethics.
- Published
- 2012
- Full Text
- View/download PDF
21. Deep ecology: Creation of theory, principles and perspectives
- Author
-
Ćorić Dragana
- Subjects
deep ecology ,philosophy ,ethics ,equal value of all beings ,balance ,Law - Abstract
From the landlord to victim, nature and our environment have gone the long way. It is destructed by the man, the only one that become from her. Deep ecology is a kind of philosophical theory, which would like to lead us to protect and respect our environment again, as we did it before. While trying to reconcile dysfunctional parts of our lives and our indstialized present, deep ecology tried to resolve some rather important ecological issues. Although it is said that deep ecology is a kind of general and not so successful ecological philosophy, that it is quiet misanthropic, almost terroristic, this theory has been populated thru decades, especially in USA and Scandinavian countries. We think that it is important to know where are its 'rights' and 'wrongs', so that we can make our future better.
- Published
- 2012
- Full Text
- View/download PDF
22. Modernity of relationship between the truth and the lie, and their ethical, philosophical and social value
- Author
-
Ćorić Dragana
- Subjects
the truth ,the lie ,untruthful telling ,ethics ,Law - Abstract
Relationship between the truth and the lie has been changing throughout different periods of time. It seems that the truth, although beautiful and solid value, that is needed as a cornerstone for establishing justice, has no more significant role in the world, because lying, or - untruthful telling, sets limits to the truth. What is their ethical, philosophical and social value and what is their relationship?.
- Published
- 2012
- Full Text
- View/download PDF
23. New minutes for Radbruch's formula
- Author
-
Ćorić Dragana
- Subjects
Radbruch ,legally ,supra-statutory un-law ,the validity of law ,Law - Abstract
Confrontation between justice and legal certainty may be resolved in such a way, that law, which insures power and legal acts, is more valuable even if it has unjust content and if it is inappropriate, except in case that the law is so unjust, that such 'corrupted law', must resign before the justice' This so called Rabruch's formula is very interesting even today, even though few decades later from its constitution. It is easily adapted into modern state of mind and functioning of legal systems. So, it deserves a few minutes more, to talk about this issue. Because, when there's no law, there are no states, nor people.
- Published
- 2011
- Full Text
- View/download PDF
24. Writing buried waveguide structures comparing ultrafast and deep-ultraviolet lasers
- Author
-
Ćorić, D., Wei, M., Herman, P. R., Ravi Bhardwaj, Corkum, P. B., and Rayner, D. M.
25. Prospects for ultrafast-laser writing of three-dimensional photonic devices for telecom applications
- Author
-
Ćorić, D., Herman, P. R., Bhardwaj, R., Paul Corkum, and Rayner, D. M.
26. Development of the internal communication satisfaction questionnaire,Razvoj mjernog instrumenta za procjenu zadovoustva internom komunikacijom
- Author
-
Verčič, A. T., Vokić, N. P., and Ćorić, D. S.
27. Evaluating the Tactile Comfort of Sportswear Fabrics
- Author
-
Milun, Kata, Čubrić, Goran, Salopek Čubrić, Ivana, Ćorić, D., Šolić, S., and Ivušić, F.
- Subjects
material, tactile comfort, subjective method, sportswear, knitted fabric - Abstract
Nowadays, producers of sportswear are focused on the development of innovative products with an added value. The investigations covering the perception of tactile comfort are an important topic in the sportswear research domain, due to the fact that consumer purchases of sportswear garments are driven by visual and sensory perception. Therefore, additional efforts have to be done towards the interpretation of sportswear attributes with respect to human senses. The aim of this manuscript is to determine the attributes describing the tactile comfort for a set of sportswear knitted fabrics with the participation of a trained group of assessors, i.e. applying the subjective method. In the focus of the experimental part are the following fabric attributes: stiffness, roughness, stretchability and thickness. The tactile comfort of the knitted fabrics is evaluated using non-aged and artificially aged fabrics and conclusions regarding the effect of ageing are brought.
- Published
- 2021
28. Characterization of Aging Responses in Materials for Sportswear
- Author
-
Brać, Petra, Salopek Čubrić, Ivana, Čubrić, Goran, Ćorić, D., Šolić, S., and Ivušić, F.
- Subjects
material, knitted fabric, ageing, sport, testing - Abstract
The ageing of sportswear materials provides the basis for the investigation of material performance under particular conditions typical for each sport. Previous investigations indicated that materials can be of high quality and perform optimally in the majority of global conditions, but still be inadequate in specific conditions of sports training. Therefore, materials intended for the production of sportswear should be tested under conditions that typify the environment in which the sportswear is expected to perform. The investigation presented in this paper focuses on the investigation of a set of materials used for the production of sportswear for professional and amateur training. For the purpose of the experiment is defined an ageing protocol that corresponds to the conditions under which indoor football is trained. Selected materials are exposed to ageing under the defined protocol. Both non-aged and aged materials are tested for a number of important properties, among which fabric thickness, surface mass, wetting rate, drying velocity, and bursting strength. In the manuscript is discussed the material deterioration due to ageing affected by material specifics and further guidelines for the production of adequate sportswear that will perform optimally are given.
- Published
- 2021
29. Ispitivanje kvalitete adhezije gradbenih komponenti u polimernim kompozitima ojačanim celuloznim vlaknima
- Author
-
Tomljenović, Antoneta, Vidoš, Jelena, Kukić, Ivana, Žmak, I., Aleksandrov Fabijanić, T, and Ćorić, D.
- Subjects
lan i konoplja ,roving pređa ,nezasićena poliesterska smola ,biokompoziti ,kvaliteta adhezije - Abstract
Kvaliteta granične površine/međusloja kod primjene celuloznih vlakana (sa svojstvom visoke apsorpcije vlage te s tim u vezi i nekompatibilnosti s hidrofobnom matricom) najčešće se ispituje utvrđivanjem međuslojne smične čvrstoće kompozita ili čvrstoće površinskog prijanjanja polimera na pojedinačnim vlaknima. U svrhu ispitivanja kvalitete adhezije matrice i ojačala također se utvrđuje kontaktni kut skrutnute mikrokapljicepolimera na pojedinačnim vlaknima. Kako se za ojačanje polimernih kompozita veće čvrstoće uglavnom koriste ojačala tkana iz pređa, u radu je prikazan razvoj metode temeljene na računalnoj analizi mikroskopske slike, a zasnovanoj na analizi oblika, mjerenju dimenzija i kontaktnog kuta skrutnute kapi nezasićene poliesterske smole (različitih viskoznosti) definiranog volumena aplicirane na uzorke visoko orijentiranih pređa iz lana i konoplje. Utvrđeno je da adsorpcija polimera i oblik skrutnute kapi ovise o konstrukciji pređe, vrsti vlakana od kojih je izrađena i viskoznosti primijenjene smole.
- Published
- 2016
30. Mass transfer analysis in the multi-regenerated fixed bed of natural zeolite
- Author
-
Vukojević Medvidović, Nediljka, Nuić, Ivona, Perić, Jelena, Trgo, Marina, Ugrina, Marin, Žmak, I., Aleksandrov Fabijanić, T., and Ćorić, D.
- Subjects
Column method ,Zinc ,Overall mass transfer coefficient ,Natural zeolite reusability - Abstract
In order to determine the rate controlling mechanism in multi-regenerated fixed bed of natural zeolite, two different approaches have been applied. The first approach includes qualitative determination of the rate controlling step based on the evaluation of the c/co value at the stoichiometric point. The second approach includes quantitative determination of the controlling mechanism by calculation of the overall mass transfer coefficient Ka, for different experimental conditions. The reusability of the fixed zeolite bed has been evaluated by repeating the sorption/elution processes in nine successive cycles using the column method.
- Published
- 2016
31. NOVE PARADIGME STRATEGIJE INTERNACIONALIZACIJE POSLOVANJA
- Author
-
Rončević, Ante, Mrvac, Nikola, Milković, Marin, Ćorić, D., and Žmak, I.
- Subjects
međunarodni marketing ,strategije ulaska ,stjecanja i spajanja ,upravljanje promjenama - Abstract
Stjecanja i spajanja poduzeća kao strategija rasta poduzeća potkraj dvadesetog stoljeća sve više postaje strategija ulaska poduzeća na strana tržišta. Tome su uvelike pridonijeli intenzivni globalizacijski procesi kroz liberalizaciju i deregulaciju te privatizaciju mnogih društvenih i gospodarskih područja. U ovom su radu prikazane strategije ulaska poduzeća na strana tržišta, a posebno je izložena jedna od najsloženih strategija ulaska na strana tržišta (stjecanja i spajanja poduzeća) s aspekta upravljanja promjenama u post-akvizicijskom periodu. Istaknuti su rizici s kojima se suočavaju sudionici akvizicijskog procesa te ponuđeni odgovori kako upravljati istima.
- Published
- 2015
32. Specific Erosion Resistance Behaviour of Cold Forged and Angular Extruded Aluminium.
- Author
-
Keran Z, Jakovljević S, Runje B, Ciganović I, and Ćorić D
- Abstract
Aluminium finds wide application in mechanical engineering due to its low density and corrosion resistance. In this research, aluminium was subjected to two different metal forming technologies-cold forging (upsetting) and equal channel angular pressing (ECAP)-to obtain improvement in its exploitation properties. Parallel to changing mechanical properties by using these two processes, there was a change in the microstructure of the material. The resulting microstructures were examined using an optical microscope. A different treated aluminium was subjected to erosion wear in various time intervals. Wear testing was conducted for two different impingement angles causing abrasive wear and impact wear. The erosion mechanisms were examined by scanning electron microscopy. These results showed that there is no statistically significant difference in erosion wear for different states at the same impingement angle. However, the difference is noticeable at different wear angles. The significance of the difference in wear of the samples treated with the forging and ECAP techniques was validated by statistical analysis with tests of different sensitivities. The results of the t -test showed that ECAPed samples present a statistically significant difference in the loss of mass due to variations in erosion angle during the 30, 45, and 60 min wearing. A substantial difference in the change in sample mass is also visible for the forged state worn for 60 min.
- Published
- 2024
- Full Text
- View/download PDF
33. Abrasion Wear Resistance of Precipitation-Hardened Al-Zn-Mg Alloy.
- Author
-
Rodinger T, Lukšić H, Ćorić D, and Rede V
- Abstract
The heat treatment of aluminum alloys is very important in industries where low weight in combination with high wear resistance, good strength, and hardness are important. However, depending on their chemical composition, aluminum alloys are subjected to different mechanical and thermal treatments to achieve the most favorable properties. In this study, an Al-Zn-Mg alloy was heat-treated including solution annealing at 490 °C for 1 h with subsequent artificial aging at 130, 160, and 190 °C for 1, 5, and 9 h. The hardness (HV1) and abrasive wear resistance with three different abrasive grain sizes were measured for all samples. The highest hardness was measured for the samples artificially aged at 130 °C/5 h, 227 HV1, while the lowest hardness was measured for the samples aged at 190 °C/9 h. The highest and the lowest wear resistance was also observed for the same state, i.e., artificially aged at 130 °C/5 h and 190 °C/9 h, respectively. The critical abrasive grain size was detected for some samples, where a decrease in wear rate was observed with an increase in the abrasive grain size from the medium value to the largest. The Response Surface Methodology (RSM) was applied to demonstrate the influence of the input parameters on the material wear rate.
- Published
- 2024
- Full Text
- View/download PDF
34. The Effect of Foaming Agents on the Thermal Behavior of Aluminum Precursors.
- Author
-
Rodinger T, Ćorić D, and Kováčik J
- Abstract
Various foaming agents can be used to achieve foaming of the precursors obtained by using the powder metallurgy method. However, the thermal behavior of pure aluminum precursors with different foaming agents has been studied very little in recent times. For the production of aluminum foams with closed cells, 1 wt.% of calcium carbonate (CaCO
3 ), titanium hydride (TiH2 ), heat-treated TiH2 and zirconium hydride (ZrH2 ) were used. The foaming capability of the compacted precursors was investigated at temperatures 700, 720 and 750 °C. CaCO3 and TiH2 showed the best foamability at all considered temperatures, while ZrH2 achieved relatively good foaming only at the highest temperature, 750 °C. Due to their low onset temperature of the decomposition compared to the melting point of the unalloyed aluminum, in hydride-based foaming agents the drainage occurred at the bottom part of the foam samples. Among the investigated foaming agents, precursors with heat-treated TiH2 had the worst foaming properties, while CaCO3 showed the best foamability without the occurrence of drainage.- Published
- 2024
- Full Text
- View/download PDF
35. Position Control of a Pneumatic Drive Using a Fuzzy Controller with an Analytic Activation Function.
- Author
-
Šitum Ž and Ćorić D
- Abstract
The fuzzy logic controller, which uses an analytic activation function for the defuzzification procedure, was applied to the position control of a servo pneumatic drive controlled by a proportional valve. The Gaussian shape of input fuzzy sets, with the possibility of their modification, was used to fuzzify the input signal. The control signal was determined by introducing an analytic function instead of defining the fuzzy rule base. In this way, a conventional 2-D fuzzy rule table base is modified into 1-D fuzzy defuzzification based on an analytic function to calculate the controller output. In this control algorithm, the problem of conventional fuzzy logic control, in terms of the exponential growth in rules as the number of input variables increases, is eliminated. The synthesis controller procedure is adjusted to the flow rate characteristic of the proportional valve. The developed control algorithms are verified by computer simulation and by testing on a real pneumatic rodless cylindrical drive.
- Published
- 2022
- Full Text
- View/download PDF
36. Hardness and Indentation Fracture Toughness of Slip Cast Alumina and Alumina-Zirconia Ceramics.
- Author
-
Žmak I, Ćorić D, Mandić V, and Ćurković L
- Abstract
Alumina (Al
2 O3 ) and zirconia (ZrO2 ) have good overall properties and thus are widely used oxide technical ceramics. The biggest drawback of Al2 O3 is its low fracture toughness. In contrast, ZrO2 is relatively tough, but is also much more expensive. In order to improve the alumina toughness, composite ceramics are being developed. Slip casting technology has economic advantages over the conventional hot isostatic pressure technology, but problems may arise when preparing stable highly-concentrated suspensions (slip) for filling the mold. The purpose of this study is to prepare aqueous suspensions using 70 wt. % α-Al2 O3 , with 0, 1, 5 and 10 wt. % of added t -ZrO2 . Suspensions were electrosterically stabilized using the ammonium salt of polymethylacrylic acid, an alkali-free anionic polyelectrolyte dispersant. Also, magnesium oxide in form of magnesium aluminate spinel (MgAl2 O4 ) was used to inhibit the abnormal alumina grain growth during the sintering process. Minimum viscosities were used as stability estimators, where an increase in ZrO2 content required adding more dispersant. After sintering, the Vickers indentation test was used to determine the hardness and the indentation fracture toughness from the measurement of the crack length. Also, the brittleness index ( Bi , μm-1/2 ) was calculated from values of Vickers hardness and the Vickers indentation fracture toughness. It was found that with increasing ZrO2 content the fracture toughness increased, while the hardness as well as the brittleness index decreased. Zirconia loading reduces the crystallite sizes of alumina, as confirmed by the X-ray diffraction analysis. SEM/EDS analysis showed that ZrO2 grains are distributed in the Al2 O3 matrix, forming some agglomerates of ZrO2 and some pores, with ZrO2 having a smaller grain size than Al2 O3 .- Published
- 2019
- Full Text
- View/download PDF
37. Effect of Additives on Stability of Alumina-Waste Alumina Suspension for Slip Casting: Optimization Using Box-Behnken Design.
- Author
-
Vukšić M, Žmak I, Ćurković L, and Ćorić D
- Abstract
The green machining of alumina (Al
2 O3 ) green bodies generates a certain amount of waste alumina powder. Waste alumina ceramic powder should be disposed of as non-hazardous waste in a legally compliant manner. The influence of additives on the stability of 70 wt.% (≈40 vol.%) alumina-waste alumina water-based suspension was investigated in the presented research. A Box-Behnken three-factor response surface design was used for the preparation of stable highly-concentrated suspensions with the addition of three additives. The optimal amount of each additive was selected according to the obtained results of minimal apparent viscosity: 0.05 wt.% Tiron as dispersant, 0.1 wt.% poly (vinyl alcohol) as binder and 0.2 wt.% magnesium aluminate spinel as abnormal grain growth inhibitor. The analysis of variance was used to identify the contribution of each additive. The zeta potential and sedimentations tests were performed to confirm the suspension stability measurements at different pH values. Alumina particles were optimally dispersed at pH values between 8 and 11. According to the results, the investigated composition of 20 wt.% waste alumina powder (weight content, dry alumina powder), with the addition of optimal amounts of additives, shows a possible application in the production of ceramics by slip casting.- Published
- 2019
- Full Text
- View/download PDF
38. Indentation size effect of Y-TZP dental ceramics.
- Author
-
Majić Renjo M, Ćurković L, Štefančić S, and Ćorić D
- Subjects
- Coloring Agents chemistry, Dental Polishing methods, Dental Stress Analysis instrumentation, Hardness, Materials Testing, Models, Chemical, Surface Properties, Ceramics chemistry, Dental Materials chemistry, Yttrium chemistry, Zirconium chemistry
- Abstract
Objective: The purpose of this study was to investigate and analyze the indentation size effect (ISE) in Vickers hardness of monolithic yttria partially stabilized zirconia (Y-TZP) dental ceramics without and with the addition of dental dye A3. The ISE is analyzed using the Mayer law, a proportional specimen resistance (PSR) model and a modified proportional specimen resistance (MPSR) model., Methods: Two samples of Y-TZP dental ceramics, trade names BruxZir (provided by Glidewell Laboratories, CA, USA), were investigated. The first sample was polished Y-TZP and the second sample was polished Y-TZP with the addition of dental dye A3, by VITA Classical Shade Guide. The Vickers hardness was measured under the following loads: 0.49N, 0.98N, 1.96N, 4.90, 9.81N and 29.42N. Thirty indentations were made on each sample, under each load. Relationships between the applied load, F, and the resulting indentation size, d, have been analyzed by the Mayer law, the PSR model and the MPSR model., Results: The Meyer index (n) for both Y-TZP dental ceramics is less than 2, which indicates that hardness is dependent on test loads. The PSR model and the MPSR model were used to calculate "true" Vickers hardness or load-independent hardness., Significance: All applied mathematical models are suitable for the data analysis, which is confirmed with high correlation coefficients, but the best correlation between measured values and mathematical models was achieved with the MPSR model with a correlation coefficient of 0.9999., (Copyright © 2014 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.)
- Published
- 2014
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.