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Management system standards and climate changes 管理体系标准与气候变化
Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2303369r
Radoslav M. Rakovic
{"title":"Management system standards and climate changes","authors":"Radoslav M. Rakovic","doi":"10.5937/tehnika2303369r","DOIUrl":"https://doi.org/10.5937/tehnika2303369r","url":null,"abstract":"During last several years sustainable development became a very actual topic in the world. For the first, the concept has been applied in the area of enviromental protection but gradually was spread to other areas of social life. Awareness of need to resolve problems significant for the Planet survival caused that officials on the World Summit in New York in 2015. agreed upon the 17 global sustainable development goals. One of the goals, goal No 13 is related to Climate actions. In this paper, topic related to climate changes is considered from the point of view of management system standards from family ISO 14000. In addition to the basic standard for environmental protection ISO 14001 it covers standards ISO 14064-1 related to Greenhouse gases emission, ISO 14067 related to carbon footprint of products, ISO 14080 which contains methodology on climate changes as well as ISO Guide 84 that represents guidelines for addressing climate changes in ISO standards. Finally, a short review of actual status of fulfillment of goal No. 13 in Serbia is given.","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":"71133804","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
Model development for casting simulation of railway aluminothermic welding 铁路铝热焊接铸造仿真模型的开发
Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2304425j
G. Jovanović, A. Delić, V. Manojlović, M. Sokić, M. Gavrilovski
{"title":"Model development for casting simulation of railway aluminothermic welding","authors":"G. Jovanović, A. Delić, V. Manojlović, M. Sokić, M. Gavrilovski","doi":"10.5937/tehnika2304425j","DOIUrl":"https://doi.org/10.5937/tehnika2304425j","url":null,"abstract":"Aluminothermic welding has been used to connect railway rails for over a century. This technique has the advantages of flexibility, weld compactness, and simplicity. External energy is not required for the procedure. Exothermic heat is produced by chemical reactions of aluminothermic elements. To create a quality welded connection, the mold and pouring system must provide uniform pouring of hot steel without turbulence, even heat dissipation or cooling, and an acceptable micro and macro structure of steel free of internal and external faults. The design of the mould was constantly changing, necessitating costly industrial experimentation. As a result, the mould's design was constantly evolving, necessitating the use of costly experimental procedures in industrial settings. The latest iteration of the model the casting cavity was improved by adding hoes in the sand and putting rails on both sides in order to more aquratly simuate heat transfer. Software programs are emulating conventional casting procedures for thermite steel casting in welded railway connections to save money and effort on costly and timeconsuming industrial testing. For the 49E1 rail, NovaFlow & Solid CV were utilized to simulate casting thermite steel in the mould cavity or weld junction.","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":"71134493","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
Technological conditions of flight instrument development 飞行仪表研制技术条件
Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2305584m
Igor Marjanović, Goran Vorotović, Miloš Vorkapić, Dragoljub Bekrić
{"title":"Technological conditions of flight instrument development","authors":"Igor Marjanović, Goran Vorotović, Miloš Vorkapić, Dragoljub Bekrić","doi":"10.5937/tehnika2305584m","DOIUrl":"https://doi.org/10.5937/tehnika2305584m","url":null,"abstract":"The development of aviation has set technological requirements that have conditioned the emergence and development of flight instrumentalization. The practical application of aviation for military and civilian purposes, the development of air traffic and technology in general, increase speeds, altitudes and flight lengths, while aircraft are becoming larger and more complex. From light wooden constructions and open cockpit, today planes fly long distances in all weather conditions, which brought the pilot and the construction of the aircraft to the endurance limit. At the beginning, during the pioneer period, flying was completely in the hands of the pilot and he made all the decisions based on his experience and psychophysical abilities. With the complexity of aircraft and flying, technological, ergonomic and safety conditions have an increasing influence on piloting technique. This paper describes the technological conditions and the development of instrumentation and flight automation systems. The application of the digital cockpit establishes many positive standards, but also raises questions about the further direction of aviation development. A special review describes the use and development of one of the basic instruments in the cockpit -the compass. This instrument is still, in an almost unchanged form, in the modern digital cockpit -glass cockpit.","PeriodicalId":22484,"journal":{"name":"Tehnika","volume":"25 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":"135612081","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
Quantum computing specificities with the application to quantum teleportation 量子计算在量子隐形传态中的应用
Tehnika Pub Date : 2023-01-01 DOI: 10.5937/tehnika2305567s
Svetomir Simonović
{"title":"Quantum computing specificities with the application to quantum teleportation","authors":"Svetomir Simonović","doi":"10.5937/tehnika2305567s","DOIUrl":"https://doi.org/10.5937/tehnika2305567s","url":null,"abstract":"The work explains quantum computing theoretical-physical basis from where quantum information processing specific features are deduced. Thereupon, quantum information processing logical representation is laid down through quantum circuits paradigm, some quantum gates of theoretical importance are defined and special attention is dedicated to existence of universal quantum gates set. Finally, an example of quantum circuits paradigm application to entangled states generation and quantum teleportation realization is exposed.","PeriodicalId":22484,"journal":{"name":"Tehnika","volume":"4 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":"135612085","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
The influence of clay modification on electrochemical behavior of quinhydrone 粘土改性对醌氢酮电化学行为的影响
Tehnika Pub Date : 2022-01-01 DOI: 10.5937/tehnika2201009a
M. Ajdukovic, N. Jović-Jovičić, A. Milutinović-Nikolić, P. Banković, Z. Mojović
{"title":"The influence of clay modification on electrochemical behavior of quinhydrone","authors":"M. Ajdukovic, N. Jović-Jovičić, A. Milutinović-Nikolić, P. Banković, Z. Mojović","doi":"10.5937/tehnika2201009a","DOIUrl":"https://doi.org/10.5937/tehnika2201009a","url":null,"abstract":"Montmorillonite originated from Wyoming was modified by acid activation and aluminum pillaring process. The samples of clay obtained in this manner, as well as starting clay, were applied at the surface of a glassy carbon electrode by the means of Nafion. The activity of these electrodes was investigated on the redox couple quinone/hydroquinone (Q/QH2) in buffered and unbuffered solutions. The type of clay modification influenced the activity of the electrodes and the mechanism of the redox reaction.","PeriodicalId":22484,"journal":{"name":"Tehnika","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71129536","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
Theoretical model of solar incident angle for an optionally oriented fixed flat surface 可选定向固定平面的太阳入射角理论模型
Tehnika Pub Date : 2022-01-01 DOI: 10.5937/tehnika2203328n
A. Nešović
{"title":"Theoretical model of solar incident angle for an optionally oriented fixed flat surface","authors":"A. Nešović","doi":"10.5937/tehnika2203328n","DOIUrl":"https://doi.org/10.5937/tehnika2203328n","url":null,"abstract":"The apparent position of the Sun in relation to any surface is defined by the solar incident angle. The solar incident angle forms the vector of the position of the Sun and the vector of normal to the observed surface. The spatial position of the aforementioned vectors is determined by solar coordinates, which include: declination, latitude, hour angle, longitude, solar elevation angle, solar azimuth angle, azimuth angle of the observed surface, angle of inclination of the observed surface in the north-south direction and angle of inclination of the observed surface in the east-west direction. This article describes in detail the theoretical model for determining the solar incident angle for an arbitrarily placed fixed, flat surface using vector algebra and analytical geometry, as well as solar coordinates. The study model, which was developed by combining, modifying, and supplementing existing models, can be used to determine the thermal performance of solar devices such as: solar collectors, PV panels, and hybrid solar systems.","PeriodicalId":22484,"journal":{"name":"Tehnika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71130836","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: 2
Adaptive neuro fuzzy Inference systems in identification, modeling and control: The state-of-the-art 自适应神经模糊推理系统在识别、建模和控制中的应用
Tehnika Pub Date : 2022-01-01 DOI: 10.5937/tehnika2204439v
Mitra Vesović, Radisa Z. Jovanovic
{"title":"Adaptive neuro fuzzy Inference systems in identification, modeling and control: The state-of-the-art","authors":"Mitra Vesović, Radisa Z. Jovanovic","doi":"10.5937/tehnika2204439v","DOIUrl":"https://doi.org/10.5937/tehnika2204439v","url":null,"abstract":"Adaptive Neural Fuzzy Inference Systems ANFIS have an increasing tendency to be used in scientific research and practical applications. The digitization of production and the emergence of Industry 4.0 enabled the development of this trend, primarily due to the ability to adapt to the task by integrating artificial neural networks and fuzzy logic, which can potentially use the advantages of both techniques in unique frameworks. This approach facilitated the modeling, data analysis, classification and control processes. The advantage of the ANFIS, compared to conventional methods, is reflected in the ability to predict the output based on a set of inputs and on the rule base. Also, these systems are suitable, because they provide the possibility to adjust the parameters of the control system. This paper presents the structure of the ANFIS system and gives a detailed review of the achievements so far, through a comparative analysis, where some possible spheres of interdisciplinary application are highlighted. Possibilities for variations, improvements and innovations of the algorithm, as well as reducing the complexity of the network architecture itself, are discussed. Proposals for some new, as yet unused combinations with metaheuristic optimization methods are presented. Finally, important guidelines are provided on when and where it is useful to apply ANFIS systems.","PeriodicalId":22484,"journal":{"name":"Tehnika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71131507","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: 1
Perovskite solar cells: Recent development and perspectives 钙钛矿太阳能电池:最新发展与展望
Tehnika Pub Date : 2022-01-01 DOI: 10.5937/tehnika2206667a
K. Aleksić, S. Marković
{"title":"Perovskite solar cells: Recent development and perspectives","authors":"K. Aleksić, S. Marković","doi":"10.5937/tehnika2206667a","DOIUrl":"https://doi.org/10.5937/tehnika2206667a","url":null,"abstract":"The energy conversion efficiency of hybrid organic-inorganic perovskite solar cells (PSCs) has reached a value comparable to commercially available silicon solar cells. The main challenges for their commercialization are instability and toxicity.","PeriodicalId":22484,"journal":{"name":"Tehnika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71132306","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
Converting of virtual machine from different CAD/CAD environments and its configuring in desired environment 从不同的CAD/CAD环境中转换虚拟机并在所需的环境中进行配置
Tehnika Pub Date : 2022-01-01 DOI: 10.5937/tehnika2201047z
S. Zivanovic, R. Puzović
{"title":"Converting of virtual machine from different CAD/CAD environments and its configuring in desired environment","authors":"S. Zivanovic, R. Puzović","doi":"10.5937/tehnika2201047z","DOIUrl":"https://doi.org/10.5937/tehnika2201047z","url":null,"abstract":"This paper describes the conversion of a virtual machine from different CAD/CAD environments and its configuring in the desired environment, which often arises as a need when you want to simulate the operation of a specific machine. In this case, two CAD/CAM environments are considered, namely Cimatron and Creo. The possibility of transfer the desired virtual machine from Cimatron CAD/CAM system and its converting to PTC Creo is considered, with an example of identical simulation in both environments. The transferred files of virtual machine are configured in the PTC Creo and STEP-NC Machine software environments. After configuring the virtual machine, the machine simulation was performed in the mentioned software environments.","PeriodicalId":22484,"journal":{"name":"Tehnika","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71129855","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: 1
Design structure matrix for evaluation of critical success factors for software projects 设计用于评估软件项目关键成功因素的结构矩阵
Tehnika Pub Date : 2022-01-01 DOI: 10.5937/tehnika2201099m
Zorica M. Mitrović, Ema D. Gligorijević, Jovana Rakićević
{"title":"Design structure matrix for evaluation of critical success factors for software projects","authors":"Zorica M. Mitrović, Ema D. Gligorijević, Jovana Rakićević","doi":"10.5937/tehnika2201099m","DOIUrl":"https://doi.org/10.5937/tehnika2201099m","url":null,"abstract":"The topic of critical success factors draws high attention of both academia and practitioners working in the software industry. Literature review shows that existing models of critical success factors for software projects are more concentrated on specific categories of success factors, neglecting the interaction that exists within these models between different groups of factors. The purpose of this paper is to present a new concept of interaction-based model for identification and evaluation of critical success factors for software projects. The approach is based on conjoint use of graph theory and Design Structure Matrices to highlight important interactions of a project system. The key result of the paper is the tool for evaluation of the interaction between critical success factors through quantification and the analysis of the possible propagation of specific factor within project success factor network, which will make possible the identification of the critical factors with the highest influence on the entire project system.","PeriodicalId":22484,"journal":{"name":"Tehnika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71130169","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
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