– Effects of oxide nanomaterials used in flotation process. Important challenges in the global water situation, mainly resulting from worldwide population growth and climate change, require novel innovative water technologies in order to ensure a supply of drinking water and reduce global water pollution. For this purpose, highly advanced nanotechnology offers new opportunities in technological developments for advanced water and wastewater technology processes. This paper presents an important method used in the wastewater treatment and in the mineral separation, named the flotation. Also, this paper presents the factors that influence the froth flotation process, such as: nanoparticle hydrophobicity, nanoparticle diameter, particle softness etc. Key-words: nanomaterials, flotation process, froth flotation, hydrophobicity, nanoparticle diameter, bubble size
{"title":"EFFECTS OF OXIDE NANOMATERIALS USED IN FLOTATION PROCESS IN WASTEWATER TREATMENT","authors":"C. Covaliu","doi":"10.24193/RCJ2017_14","DOIUrl":"https://doi.org/10.24193/RCJ2017_14","url":null,"abstract":"– Effects of oxide nanomaterials used in flotation process. Important challenges in the global water situation, mainly resulting from worldwide population growth and climate change, require novel innovative water technologies in order to ensure a supply of drinking water and reduce global water pollution. For this purpose, highly advanced nanotechnology offers new opportunities in technological developments for advanced water and wastewater technology processes. This paper presents an important method used in the wastewater treatment and in the mineral separation, named the flotation. Also, this paper presents the factors that influence the froth flotation process, such as: nanoparticle hydrophobicity, nanoparticle diameter, particle softness etc. Key-words: nanomaterials, flotation process, froth flotation, hydrophobicity, nanoparticle diameter, bubble size","PeriodicalId":30186,"journal":{"name":"Riscuri si Catastrofe","volume":"20 1","pages":"185-193"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69192668","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}
– Post-industrial landscape evolution in Hunedoara. The development of steel industry in Hunedoara (1882-1989) had social and economic consequences, generating structural and functional changes in the geographical landscape in Hunedoara, with local, regional and national repercussions. The industrial landscape in Hunedoara took shape around the steel industry, a platform that supported the entire local community (by employment) and galvanized the economic relations with other cities in the county of Hunedoara (Deva, Călan, Haţeg, Petroșani, Brad, Orăștie), and also with cities in the neighboring counties (Timisoara, Reșița, Sebeș, Alba Iulia, Tg. Jiu, Craiova, Sibiu). The changes that occurred in the economic policy in Romania, after 1989, have resulted in major structural changes in the landscape of Hunedoara. The process of de-industrialization left a significant mark in the physiography of the landscape in Hunedoara and its functionality. The dismantling and demolition of the industrial platform (a pennant of industrial development in socialist Romania) led to the abandonment of a steelworker lifestyle, to retraining, to migration of specialized workforce and especially young people, to other destinations. The city today is looking for a new identity, embracing the steel industry tradition and tourist resources of the area.
{"title":"Post-industrial landscape evolution in Hunedoara.","authors":"I. Irimuş","doi":"10.24193/RCJ2017_15","DOIUrl":"https://doi.org/10.24193/RCJ2017_15","url":null,"abstract":"– Post-industrial landscape evolution in Hunedoara. The development of steel industry in Hunedoara (1882-1989) had social and economic consequences, generating structural and functional changes in the geographical landscape in Hunedoara, with local, regional and national repercussions. The industrial landscape in Hunedoara took shape around the steel industry, a platform that supported the entire local community (by employment) and galvanized the economic relations with other cities in the county of Hunedoara (Deva, Călan, Haţeg, Petroșani, Brad, Orăștie), and also with cities in the neighboring counties (Timisoara, Reșița, Sebeș, Alba Iulia, Tg. Jiu, Craiova, Sibiu). The changes that occurred in the economic policy in Romania, after 1989, have resulted in major structural changes in the landscape of Hunedoara. The process of de-industrialization left a significant mark in the physiography of the landscape in Hunedoara and its functionality. The dismantling and demolition of the industrial platform (a pennant of industrial development in socialist Romania) led to the abandonment of a steelworker lifestyle, to retraining, to migration of specialized workforce and especially young people, to other destinations. The city today is looking for a new identity, embracing the steel industry tradition and tourist resources of the area.","PeriodicalId":30186,"journal":{"name":"Riscuri si Catastrofe","volume":"20 1","pages":"195-207"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69192740","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 impact of tourism activities. A point of view. The tourism, as a phenomenon of local to global impact, and complex activity with complex effects, from the economic to the social ones and, not least with influence on the environment, determined a new way of cohabitation between the natural and anthropic and anthropogenic environment through tourism. Its bipolar character phenomenon and business – has given it a particular position among other categories of activities, such as generating flows of tourism product consumers, from the area of origin, or the tourist market, to the tourist’s destination area, including touristic attractions belonging to the natural and man-made environment, or primary touristic offers, which includes the tourism infrastructure with different size and complexity. This study attempts to capture the complexity and extent of this phenomenon, with multiple effects, having a spatially and temporally complex and phasing evolution, summarized in five stages, starting from the phase of pretourism to the one of maximum and complex development, until the saturation and decline phase, with the possibility of a new cycle re-enactment.
{"title":"The impact of tourism activities. A point of view","authors":"N. Ciangă","doi":"10.24193/RCJ2017_02","DOIUrl":"https://doi.org/10.24193/RCJ2017_02","url":null,"abstract":"The impact of tourism activities. A point of view. The tourism, as a phenomenon of local to global impact, and complex activity with complex effects, from the economic to the social ones and, not least with influence on the environment, determined a new way of cohabitation between the natural and anthropic and anthropogenic environment through tourism. Its bipolar character phenomenon and business – has given it a particular position among other categories of activities, such as generating flows of tourism product consumers, from the area of origin, or the tourist market, to the tourist’s destination area, including touristic attractions belonging to the natural and man-made environment, or primary touristic offers, which includes the tourism infrastructure with different size and complexity. This study attempts to capture the complexity and extent of this phenomenon, with multiple effects, having a spatially and temporally complex and phasing evolution, summarized in five stages, starting from the phase of pretourism to the one of maximum and complex development, until the saturation and decline phase, with the possibility of a new cycle re-enactment.","PeriodicalId":30186,"journal":{"name":"Riscuri si Catastrofe","volume":"20 1","pages":"25-40"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69192645","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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