{"title":"Theorethical Study of Poly (P-Phenylenevinylene ) Derivates","authors":"I. Nikolényi, J. Tóth","doi":"10.26649/musci.2019.015","DOIUrl":"https://doi.org/10.26649/musci.2019.015","url":null,"abstract":"","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133616974","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}
{"title":"Phenomenological Modeling of Gas Explosion in Closed Vessel","authors":"Viktória Mikáczó, G. Szepesi","doi":"10.26649/musci.2019.047","DOIUrl":"https://doi.org/10.26649/musci.2019.047","url":null,"abstract":"","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121430057","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}
{"title":"The Effect of Optimization on the Design of Steel Structures","authors":"K. Jármai, S. Kmeť","doi":"10.26649/musci.2019.043","DOIUrl":"https://doi.org/10.26649/musci.2019.043","url":null,"abstract":"","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115228411","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}
Stress corrosion cracking (SCC) even nowadays is the cause of significant service failures, it can occur in almost any type of components of the chemical industry such as steam generator tubes, pressurizer instrument penetrations and heater sleeves, control rod drive mechanism (CRDM) nozzles, heat exchangers [1]-[6]. One of the most recent major accident happened in 2009, where a 50-foot-tall highpressure vessel ruptured, resulting in one fatality and one injury of the public. Based on the review of the National Institute of Standards and Technology the failure was caused by the combination of stress corrosion cracking and a reduction in material toughness during service [6]. In case of existing nuclear power plants the stress corrosion cracking counts as one of the important ageing degradations. For stress corrosion to occur three indispensable factors have to be present, which are the tensile stress, the environment and the susceptible material. If changes are made in any of these factors then the susceptibility to SCC often can be eliminated or reduced. The tensile stress can originate from residual stresses, operational loadings, the structural and metallurgical factors includes the degree of grain size, thermal treatment, cold work, and finally the environment factors are resulted from the water chemistry, the operating temperature [1]. However this type of failure is sudden and difficult to predict and also material properties may change with time or due to material processing. Therefore the right way of prediction and modelling of SCC is still a vital research area. In this article the different type of SCC mechanisms are presented, the ones used in the nuclear industry in more details.
{"title":"Mechanisms of Stress Corrosion Cracking","authors":"Bernadett Spisák, S. Szávai","doi":"10.26649/musci.2019.052","DOIUrl":"https://doi.org/10.26649/musci.2019.052","url":null,"abstract":"Stress corrosion cracking (SCC) even nowadays is the cause of significant service failures, it can occur in almost any type of components of the chemical industry such as steam generator tubes, pressurizer instrument penetrations and heater sleeves, control rod drive mechanism (CRDM) nozzles, heat exchangers [1]-[6]. One of the most recent major accident happened in 2009, where a 50-foot-tall highpressure vessel ruptured, resulting in one fatality and one injury of the public. Based on the review of the National Institute of Standards and Technology the failure was caused by the combination of stress corrosion cracking and a reduction in material toughness during service [6]. In case of existing nuclear power plants the stress corrosion cracking counts as one of the important ageing degradations. For stress corrosion to occur three indispensable factors have to be present, which are the tensile stress, the environment and the susceptible material. If changes are made in any of these factors then the susceptibility to SCC often can be eliminated or reduced. The tensile stress can originate from residual stresses, operational loadings, the structural and metallurgical factors includes the degree of grain size, thermal treatment, cold work, and finally the environment factors are resulted from the water chemistry, the operating temperature [1]. However this type of failure is sudden and difficult to predict and also material properties may change with time or due to material processing. Therefore the right way of prediction and modelling of SCC is still a vital research area. In this article the different type of SCC mechanisms are presented, the ones used in the nuclear industry in more details.","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125694192","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}
The electron beam welding (EBW) sets new standards as it facilitates very high quality and effective welding of high strength structural steels. The technology ensures high-quality critical welded joints in thicker structural metals. It has a high energy density in comparison to the conventional arc welding processes (e.g. GMAW). As a result of less overall energy input and higher velocity, the effect of welding on the base material in the heat-affected zone (HAZ) and the distortion is much smaller compared to conventional arc welding processes. The low heat input result in a small HAZ and a reduced extension of critical HAZ areas which can be favourable in high strength steels when the mechanical properties can drastically decrease in the HAZ. In comparison with experimental studies, a numerical modelling study can provide detailed information concerning the welding process and parameters, and the number of costly experiments can be reduced. Finite element modelling (FEM) of EBW enables the estimation of temperature field, time temperature curve, weld pool geometry and welding distortion etc. The determination of the temperature field can be very useful in terms of the further investigations since the t8/5 cooling time can be less than 2 s during EBW. In this paper, by the application of Sysweld software, the time-temperature curve was determined and the physical simulation of the critical HAZ subzones were performed using a GLEEBLE 3500 physical simulator in order to analyse the properties of HAZ during extremely short cooling time.
{"title":"Investigation of Electron Beam Welding of AHSS by Physical and Numerical Simulation","authors":"R. Sisodia, M. Marcell","doi":"10.26649/musci.2019.051","DOIUrl":"https://doi.org/10.26649/musci.2019.051","url":null,"abstract":"The electron beam welding (EBW) sets new standards as it facilitates very high quality and effective welding of high strength structural steels. The technology ensures high-quality critical welded joints in thicker structural metals. It has a high energy density in comparison to the conventional arc welding processes (e.g. GMAW). As a result of less overall energy input and higher velocity, the effect of welding on the base material in the heat-affected zone (HAZ) and the distortion is much smaller compared to conventional arc welding processes. The low heat input result in a small HAZ and a reduced extension of critical HAZ areas which can be favourable in high strength steels when the mechanical properties can drastically decrease in the HAZ. In comparison with experimental studies, a numerical modelling study can provide detailed information concerning the welding process and parameters, and the number of costly experiments can be reduced. Finite element modelling (FEM) of EBW enables the estimation of temperature field, time temperature curve, weld pool geometry and welding distortion etc. The determination of the temperature field can be very useful in terms of the further investigations since the t8/5 cooling time can be less than 2 s during EBW. In this paper, by the application of Sysweld software, the time-temperature curve was determined and the physical simulation of the critical HAZ subzones were performed using a GLEEBLE 3500 physical simulator in order to analyse the properties of HAZ during extremely short cooling time.","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116446730","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}
The salt content in the secondary dross obtained beside the recovered aluminium by the hot processing of the primary melting dross hinders further utilization of this material. Secondary dross samples obtained from the industrial hot processing of the primary dross generated by the melting of aluminium alloy scrap were leached with water at room temperature with different Liquid/Solid (L:S) ratios. Vessel filling (the relative volume occupied by the sludge) in the shaking bottles required further consideration in the interpretation of the results. Samples taken regularly within 15 minutes during vigorous shaking showed that NaCl and KCl can be dissolved almost instantly, and completely irrespective of the parameter settings. However, the fluoride additive (CaF2) has a complex behaviour. The results suggest its relation to some side reactions indicating also the conditions of the hot process producing the examined material. The results suggest that the salt content of the secondary aluminium dross can be lixiviated within a 2 – 4 minutes virtually completely, but the L:S ratio and the a vessel filling have to be coordinated. At the lowest L:S ratio examined of 1.0, a vessel filling of max. 11% should be observed to achieve this fast salt dissolution. The same dissolution rate can be reached with double the vessel filling (i.e. smaller unit) if the L:S is also increased in this ratio.
{"title":"The Fundamental Kinetic Characteristics of Aqueous Dissolution of Chloride and Fluoride Salts from Secondary Aluminium Dross","authors":"I. Illés, M. Sassi, H. Zakiyya, T. Kékesi","doi":"10.26649/musci.2019.083","DOIUrl":"https://doi.org/10.26649/musci.2019.083","url":null,"abstract":"The salt content in the secondary dross obtained beside the recovered aluminium by the hot processing of the primary melting dross hinders further utilization of this material. Secondary dross samples obtained from the industrial hot processing of the primary dross generated by the melting of aluminium alloy scrap were leached with water at room temperature with different Liquid/Solid (L:S) ratios. Vessel filling (the relative volume occupied by the sludge) in the shaking bottles required further consideration in the interpretation of the results. Samples taken regularly within 15 minutes during vigorous shaking showed that NaCl and KCl can be dissolved almost instantly, and completely irrespective of the parameter settings. However, the fluoride additive (CaF2) has a complex behaviour. The results suggest its relation to some side reactions indicating also the conditions of the hot process producing the examined material. The results suggest that the salt content of the secondary aluminium dross can be lixiviated within a 2 – 4 minutes virtually completely, but the L:S ratio and the a vessel filling have to be coordinated. At the lowest L:S ratio examined of 1.0, a vessel filling of max. 11% should be observed to achieve this fast salt dissolution. The same dissolution rate can be reached with double the vessel filling (i.e. smaller unit) if the L:S is also increased in this ratio.","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114856167","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}
Continuous analysis of the corporate environment is key to executives with a strategic approach to companies. However, analysing the company's environment can not only be relevant to the individual entity but can also provide valuable information to researchers and professionals looking at the industry and the trends that can be observed there. The author's research focus is on district heat suppliers. The purpose of this study is to measure the new aspects of district heat suppliers' industry specificities with the application of Porter's five forces analysis and to gather the factors that may affect the asset, financial and income position of companies.
{"title":"Porter's Five Forces Analysis of the District Heat Sector","authors":"G. Süveges","doi":"10.26649/musci.2019.070","DOIUrl":"https://doi.org/10.26649/musci.2019.070","url":null,"abstract":"Continuous analysis of the corporate environment is key to executives with a strategic approach to companies. However, analysing the company's environment can not only be relevant to the individual entity but can also provide valuable information to researchers and professionals looking at the industry and the trends that can be observed there. The author's research focus is on district heat suppliers. The purpose of this study is to measure the new aspects of district heat suppliers' industry specificities with the application of Porter's five forces analysis and to gather the factors that may affect the asset, financial and income position of companies.","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122443654","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}
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