{"title":"Preliminary Geopolymerization Experiments of Vietnamese Fly Ash and Slag","authors":"Q. V. Trinh, S. Nagy, G. Mucsi","doi":"10.26649/musci.2019.009","DOIUrl":"https://doi.org/10.26649/musci.2019.009","url":null,"abstract":"","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"279 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":"132862049","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}
In this paper the effect of cutting parameters on the cutting forces in face milling of C45 steel is investigated. Five different values of feed per tooth are tested and cutting forces are measured by a dynamometer, on a xyz-axis coordinate system attached to the workpiece. Experiments were done for three milling modes: symmetrical, up-milling and down-milling.
{"title":"Effect of Cutting Parameters in Face Milling","authors":"T. Makkai","doi":"10.26649/musci.2019.046","DOIUrl":"https://doi.org/10.26649/musci.2019.046","url":null,"abstract":"In this paper the effect of cutting parameters on the cutting forces in face milling of C45 steel is investigated. Five different values of feed per tooth are tested and cutting forces are measured by a dynamometer, on a xyz-axis coordinate system attached to the workpiece. Experiments were done for three milling modes: symmetrical, up-milling and down-milling.","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"49 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":"124923156","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 major goal of this potentiodynamic study was to explore the characteristics of zinc electrodeposition from chloride (ZnCl2 – HCl) media. The influence of various operating parameters such as zinc concentration in the 30 – 150 g/dm 3 range, acidity level (pH in the 1.5 – 5.5 range) and rotation speed (0 – 950 r.p.m.) were investigated at room temperature. Deposit morphologies were recorded by a digital camera during cathodic polarization. The physical quality of the electrode surface seems to be one of the important parameters not only for the deposit structure but also for the side reaction of H2 evolution and also for the development of the polarization curves. There are three kinds of cathodic depositions occurring. It generally starts with a uniform and stable structure, followed by a sponge-like deposit and finally it turns into a dendritic growth due to concentration changes near the surface. However, electrolyte agitation can influence the deposition pattern. With increased rotation speeds (above ~ 500 r.p.m.), resulting in higher available concentrations of electro-active ions at the surface, there is not much sponge-like deposit, yet the dendrite formation at the edges could not be avoided. The strong increase in the actual specific surface area of the cathode, due to the sponge-like deposit and the dendrite formation, caused irregularities in the potential change executed by the computer controlled potentiostat. Although this instrument was designed and produced at the institute specifically for high speed measurements. By lowering the pH in the electrolytes of the lowest Zn concentrations, the side reaction of H2 evolution soon appeared, after the limiting current of Zn deposition was reached. At higher Zn concentrations though, instead of a clear limiting current, the slope of the polarization curve persisted all across the examined potential range, indicating a continual co-deposition of H2 together with that of Zn.
{"title":"Potentiodynamic Characteristics of Zinc Elektrodeposition from Chloride Solutions","authors":"H. Zakiyya, T. Kékesi","doi":"10.26649/musci.2019.084","DOIUrl":"https://doi.org/10.26649/musci.2019.084","url":null,"abstract":"The major goal of this potentiodynamic study was to explore the characteristics of zinc electrodeposition from chloride (ZnCl2 – HCl) media. The influence of various operating parameters such as zinc concentration in the 30 – 150 g/dm 3 range, acidity level (pH in the 1.5 – 5.5 range) and rotation speed (0 – 950 r.p.m.) were investigated at room temperature. Deposit morphologies were recorded by a digital camera during cathodic polarization. The physical quality of the electrode surface seems to be one of the important parameters not only for the deposit structure but also for the side reaction of H2 evolution and also for the development of the polarization curves. There are three kinds of cathodic depositions occurring. It generally starts with a uniform and stable structure, followed by a sponge-like deposit and finally it turns into a dendritic growth due to concentration changes near the surface. However, electrolyte agitation can influence the deposition pattern. With increased rotation speeds (above ~ 500 r.p.m.), resulting in higher available concentrations of electro-active ions at the surface, there is not much sponge-like deposit, yet the dendrite formation at the edges could not be avoided. The strong increase in the actual specific surface area of the cathode, due to the sponge-like deposit and the dendrite formation, caused irregularities in the potential change executed by the computer controlled potentiostat. Although this instrument was designed and produced at the institute specifically for high speed measurements. By lowering the pH in the electrolytes of the lowest Zn concentrations, the side reaction of H2 evolution soon appeared, after the limiting current of Zn deposition was reached. At higher Zn concentrations though, instead of a clear limiting current, the slope of the polarization curve persisted all across the examined potential range, indicating a continual co-deposition of H2 together with that of Zn.","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"20 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":"125623920","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}
In foothills and mountainous areas, we can often encounter mass movement processes, which suddenly and spectacularly change the surface. These processes are still actively involved in the formation of valleys [1], which can potentially trigger a lot of damage to human lives and property. The best way to predict surface movement processes is exploring sensitive areas of surface movement. Maps the significance of mass movements have been made since the early 1970s and 1980s. In order to validate these old maps field investigations were conducted. The target area of our research was the Bükkalja (Foothill of the Bükk Mountains). On the basis of the Central Geological Office (CGO) survey [2], the density of landslide movements in the examined area is 5-10 movements/100 km, these movement processes occur on 0-25% of western part and 20-50% of eastern part of the Bükkalja [3]. In our work, we have mapped the landslide susceptibility by applying 4 different GIS-base methods, published in the scientific literature. Our aim was to analyse the results of these methods and to compare these maps with the susceptibility map based on the CGO survey.
{"title":"Landslide Susceptibility Mapping Using GIS-Based Methods in the Bükkalja (Hungary)","authors":"Pecsmány Pecsmány, A. András, J. Vágó","doi":"10.26649/musci.2019.008","DOIUrl":"https://doi.org/10.26649/musci.2019.008","url":null,"abstract":"In foothills and mountainous areas, we can often encounter mass movement processes, which suddenly and spectacularly change the surface. These processes are still actively involved in the formation of valleys [1], which can potentially trigger a lot of damage to human lives and property. The best way to predict surface movement processes is exploring sensitive areas of surface movement. Maps the significance of mass movements have been made since the early 1970s and 1980s. In order to validate these old maps field investigations were conducted. The target area of our research was the Bükkalja (Foothill of the Bükk Mountains). On the basis of the Central Geological Office (CGO) survey [2], the density of landslide movements in the examined area is 5-10 movements/100 km, these movement processes occur on 0-25% of western part and 20-50% of eastern part of the Bükkalja [3]. In our work, we have mapped the landslide susceptibility by applying 4 different GIS-base methods, published in the scientific literature. Our aim was to analyse the results of these methods and to compare these maps with the susceptibility map based on the CGO survey.","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"31 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":"129568729","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":"Study of Backpressure Values of Direct Spring Loaded Safety Valves","authors":"T. Pusztai","doi":"10.26649/musci.2019.050","DOIUrl":"https://doi.org/10.26649/musci.2019.050","url":null,"abstract":"","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"5 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":"127637913","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}
Mixing is the most prominent factor, undeviatingly determines the consequences of an anaerobic digester with higher solid content. This paper presents the Computational Fluid Dynamic model using Ansys SC tetra software that characterize the mechanical mixing by maxblend impeller in an anaerobic digester. Effect of impeller geometry is studied on the flow pattern, dead volume and particle velocity distribution. Geometry of maxblend is analyzed along with varying mixing speeds of impeller. Mixing was analyzed at three different speeds i.e. 40, 80 and 100 rpm. It was observed that higher mixing intensity resulted in increased particle velocity. Uniform distribution of velocity was observed and mixing speed of 80 and 100 rpm seems optimal. This paper recommends the strategy for modelling mechanically mixed slurry at lab scale. Keyword: anaerobic digestion, mixing, CFD, maxblend impeller Acronyms CFD Computational fluid dynamics K Consistency index AD Anaerobic digestion MI Marine impeller RPM Revolution per minute AI Anchor impeller RT Rushton turbine PI Pelton impeller HR Helical ribbon HEB High efficiency blade DFB Disc mounted flat blade TS Total solid
{"title":"CFD Simulation of Mixing by Maxblend Impeller in a Lab-Scale Anaerobic Digester","authors":"Buta Singh","doi":"10.26649/musci.2019.010","DOIUrl":"https://doi.org/10.26649/musci.2019.010","url":null,"abstract":"Mixing is the most prominent factor, undeviatingly determines the consequences of an anaerobic digester with higher solid content. This paper presents the Computational Fluid Dynamic model using Ansys SC tetra software that characterize the mechanical mixing by maxblend impeller in an anaerobic digester. Effect of impeller geometry is studied on the flow pattern, dead volume and particle velocity distribution. Geometry of maxblend is analyzed along with varying mixing speeds of impeller. Mixing was analyzed at three different speeds i.e. 40, 80 and 100 rpm. It was observed that higher mixing intensity resulted in increased particle velocity. Uniform distribution of velocity was observed and mixing speed of 80 and 100 rpm seems optimal. This paper recommends the strategy for modelling mechanically mixed slurry at lab scale. Keyword: anaerobic digestion, mixing, CFD, maxblend impeller Acronyms CFD Computational fluid dynamics K Consistency index AD Anaerobic digestion MI Marine impeller RPM Revolution per minute AI Anchor impeller RT Rushton turbine PI Pelton impeller HR Helical ribbon HEB High efficiency blade DFB Disc mounted flat blade TS Total solid","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"60 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":"126785568","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":"Agricultural Integration and Social Innovation","authors":"Flóra Orosz","doi":"10.26649/musci.2019.095","DOIUrl":"https://doi.org/10.26649/musci.2019.095","url":null,"abstract":"","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"12 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":"121925814","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":"Potential Application of a Novel Non-Destructive Anisotropy Investigation Method","authors":"M. Sepsi, M. Benke, E. Nagy, V. Mertinger","doi":"10.26649/musci.2019.081","DOIUrl":"https://doi.org/10.26649/musci.2019.081","url":null,"abstract":"","PeriodicalId":340250,"journal":{"name":"MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference","volume":"2 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":"131805621","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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