Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2305525d

Olivera Dragutinović, Suzana Dimitrijević-Branković, Đorđe Veljović

{"title":"Processing and properties of scaffolds based on calcium phosphate doped with magnesium, copper and zinc-ions coated with gelatin","authors":"Olivera Dragutinović, Suzana Dimitrijević-Branković, Đorđe Veljović","doi":"10.5937/tehnika2305525d","DOIUrl":"https://doi.org/10.5937/tehnika2305525d","url":null,"abstract":"The main goal of this study was to examine the possibility for obtaining macroporous scaffolds with defined properties based on calcium phosphate doped with magnesium, copper and zinc ions, coated with gelatin, which would potentially provide controlled conditions for the formation of new bone tissue after implantation. As a first, multi-doped nanoparticles of hydroxyapatite (HAp), which represents the main component of the inorganic part of bone tissue, was synthesized by autoclaving the precursor solution obtained at a Ca/P molar ratio of 1.52. Calcium in the initial solution was partially replaced by ions of magnesium (5 mol.%), copper (0.4 mol.%) and zinc (0.4 mol.%). Obtained powder was further calcinated, the changes in the morphology of the powders during calcination at 1000 ̊ C were reflected in the transition of spherically agglomerated needle-like nanoparticles of the multi-doped hydroxy-apatite powder to a spherical grained morphology. Macroporous bioceramic structures were obtained using the sponge replica method, green macroporous samples made of calcinated multi-doped powder, polyvinyl alcohol and water were sintered at 1.370°Ϲ and 1.430°Ϲ. X-ray diffraction analysis deter-mined that the presence of magnesium in the structure of hydroxyapatite favors the phase transformation of HAp into b-tricalcium-phosphate (b-TCP), which contributed to the formation of the biphasic HAp/b-TCP system during the calcination of the powders, but also during the sintering of macroporous beads. Examination of the antimicrobial activity of the obtained macroporous supports against E. coli showed a more effective degree of inhibition compared to S. aureus. A significant increase in the compressive strength of sintered macroporous scaffolds was obtained after the formation of coating based on 7.5% gelatin solution.","PeriodicalId":22484,"journal":{"name":"Tehnika","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135611940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Security in Cyber-Physical and IoT Systems 网络物理和物联网系统中的安全

Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2301045u

U. Urosevic, Marija Čubrović

引用次数: 0

The importance of biomedical engineers in the health system 生物医学工程师在卫生系统中的重要性

Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2302231p

Z. Pendić, Tomislav Jovanović, L. Vujotić, Sanja Pendić-Polak, D. Jovanović, B. Jakovljevic, L. Jovanović, Ana Milijić, Marko Polak, Željko Marković, Sanja Ivošević

引用次数: 0

Influence of management styles on the commitment of local government employees 管理风格对地方政府雇员承诺的影响

Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2302215d

Mihajlo Đurović, Dejan Petrović, Goran Perić

{"title":"Influence of management styles on the commitment of local government employees","authors":"Mihajlo Đurović, Dejan Petrović, Goran Perić","doi":"10.5937/tehnika2302215d","DOIUrl":"https://doi.org/10.5937/tehnika2302215d","url":null,"abstract":"Local government as a part of the independent management of local communities represents the basic organization of government. Management is a process of guiding employees toward activities that are relevant to achieving local government goals. Many authors analyzed this subject in their work, while this subject, as well as management styles and the influence of management styles on the commitment of employees in local government, remains unexplored, especially in the context of the Republic of Serbia. The main goal of this research is to look into the influence of management styles on local government employee dedication. This research was conducted during July and August of 2022 and includes a sample of 70 examined local government employees in Serbia. The influence of management styles (transactional, transformational, and passive) on employees was tested with the use of linear regression. The results of this research conclude that transactional leadership has a medium level of influence on local government employee dedication, while the level of transformational management influence on local government employee dedication is high. In the conclusion of this research results are discussed and limitations are set as well as the practical implications of this work.","PeriodicalId":22484,"journal":{"name":"Tehnika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71133479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strategic management and business model 战略管理和商业模式

Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2302237l

Stanislav Lisse

{"title":"Strategic management and business model","authors":"Stanislav Lisse","doi":"10.5937/tehnika2302237l","DOIUrl":"https://doi.org/10.5937/tehnika2302237l","url":null,"abstract":"With the help of numerous quotes from books and textbooks by contemporary authors of indispensable works on strategy and strategic management, I tried to provide the reader with a series of definitions of key terms and point out the importance of the correct sequence of activities in the strategy development phase. Strategic management, although young, is a very large scholarly field (most textbooks focus mainly on strategy development, the first of the three phases of strategic management, and most are more than 900 pages long). The second and third phases, the implementation and evaluation of the strategy, are mostly omitted with the explanation that they depend on the economic branch in which the organization operates. Here is article four, excerpted from my unpublished monograph on business strategy. In the previous three articles, I tried to present, through quotes from renowned authors, the modern understanding of strategy and its role in the organization's efforts to achieve a favorable position on the market and successfully resist the attacks of agile competitors. Many academics believe that a business model is a picture (a picture is worth a thousand words) of a realized strategy and that it is the finale of strategic management, which consists of a series of activities that natural evolution has kept as crucial in the fight for the survival of not only living beings but also of every organization.","PeriodicalId":22484,"journal":{"name":"Tehnika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71134014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Jovanovići deposit: New formation type of dimension and construction stone in Montenegro Jovanovići矿床:黑山新形成类型的尺寸和建筑石材

Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2302159b

Darko Božović, V. Šimić

{"title":"Jovanovići deposit: New formation type of dimension and construction stone in Montenegro","authors":"Darko Božović, V. Šimić","doi":"10.5937/tehnika2302159b","DOIUrl":"https://doi.org/10.5937/tehnika2302159b","url":null,"abstract":"Dimension and construction stone is one of the most significant non-metallic mineral raw material in Montenegro. There are numerous carbonate deposits in Montenegro (dimension and construction stone), either investigated or in exploitation, including the Bjelopavlići area which occupies the most significant place. Formation-mineragenic analysis of the carbonate sediments of the Bjelopavlići area revealed several formations of carbonate raw materials, including Jovanovići formation, as a new formation of dimension and construction stone in Montenegro. The paper presents the results of a multiyear formation-mineragenic analysis in the Bjelopavlići area, and the results of detailed geological exploration of the Jovanovići deposit of dimension and construction stone, calculated reserves, qualitative characteristics, possibility of their application and potential. The paper pays special attention to the examination of their sedimentological, biostratigraphic, and physico-mechanical characteristics. Results show that limestones of this formation type can be used as dimension stone. Also, the paper provides a brief overview of chemical, geochemical, and technological properties of these limestones with the possibility of their usage as a carbonate filler in various branches of industry.","PeriodicalId":22484,"journal":{"name":"Tehnika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71133052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of the stability of the Lipovica dam using the Karlsruhe method 用卡尔斯鲁厄法分析利波维卡大坝的稳定性

Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2303283b

V. Boskovic, Milutin Pejović, B. Božić, Zagorka Gospavić

引用次数: 0

Synthesis, structural and mechanical properties of gelatin-based nanocomposites with zinc oxide for use in dentistry 牙科用明胶基氧化锌纳米复合材料的合成、结构和力学性能

Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2302133j

M. Jovanović, M. Petrović, N. Zlatanović, E. Ali, V. Radojević

引用次数: 0

Testing of the mechanical properties of reggranulate PVC with the addition of plasticizer from waste PET 废PET增塑剂对聚氯乙烯颗粒料力学性能的影响

Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2304389v

M. Vuksanović, Milena Milošević, N. Knežević, A. Egelja, Ljiljana Janković-Mandić, I. Mladenović, A. Marinković