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Wyświetlanie 1-4 z 4
Tytuł:
Remittances As Home Orientation Rooted in the Lifeworlds of Immigrants
Autorzy:
Sandu, Dumitru
Powiązania:
https://bibliotekanauki.pl/articles/498665.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
home orientation
remittances
deprivation
communication behaviours
return intentions
Opis:
The study considers remittances as part of the lifeworlds of immigrants in multiple interactions with return intentions and communication with those left behind. This is an alternative view of the standard approach to remittances as a possible source of development or as a variable to be explained by family solidarity, investment projects or the reasons for return. The key dependent variable is the home orientation of immigrants as a function of remittances, return intentions and communication behaviours, measured in quantitative and typological terms. The typological analysis of home orientation diverges from the standard approach, which is in terms of high or low intensity of cross-border activities of remitting or communicating between immigrants and those they have left behind. It argues for the fact that cross-border activities combine in different ways to generate specific social types of remitting practices. The remitting behaviours of migrants are, in our approach, multidimensional, encompassing economic, social and cultural content. Three hypotheses are formulated on: 1) collective deprivation in remitting money; 2) survival–development–identification strategies of migrants’ families; and 3) higher predictability of home orientation compared to economic remitting behaviours. In this context, higher predictability means greater variation of the synthetic variable of home orientation by social, cultural and economic factors as compared to the impact of the same factors on the more abstract variable of economic remittances.
Źródło:
Central and Eastern European Migration Review; 2016, 5, 2; 81-98
2300-1682
Pojawia się w:
Central and Eastern European Migration Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Subjective Well-Being between the Migration Experience of Returnees and the Country Effect: An Integrated Approach on European Spaces
Autorzy:
Sandu, Dumitru
Powiązania:
https://bibliotekanauki.pl/articles/48859134.pdf
Data publikacji:
2024
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
return migration
migration experience
subjective well-being
comparative analysis
European Union
Opis:
How is the well-being of returnees when considered from the point of view of the migration experience abroad? To answer this question, the first hypothesis considers that returnees differ in the function of the key activity they had abroad – working, studying or living there without working or studying. Secondly, even if one maintains constant socio-demographic profiles, the country of return counts. Thirdly, it depends also on the facet of subjective well-being (SWB) that is considered – the happiness of living in a certain country of the European Union or a person’s satisfaction with life, country, public services or income. The results of the multivariate analysis indicate that experience of migration, country of current residence and facets of SWB all count. Returnees – through their experience of migration abroad – are compared to non-migrants. The answers come from analysing data from a large Eurobarometer survey in the European Union. Multivariate regression and cluster analysis are the main data-processing procedures. The stability of the results is tested by sensitivity analysis.
Źródło:
Central and Eastern European Migration Review; 2024, 13, 1; 151-168
2300-1682
Pojawia się w:
Central and Eastern European Migration Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Analysis of Ambient Cured Phosphate Based-Geopolymers with Coal-Ash as Precursor
Autorzy:
Burduhos Nergis, Dumitru Doru
Vizureanu, Petrica
Lupescu, Stefan
Burduhos Nergis, Diana Petronela
Perju, Manuela-Cristina
Sandu, Andrei Victor
Powiązania:
https://bibliotekanauki.pl/articles/2106564.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acid activation
coal ash
microstructural analysis
phosphate based geopolymers
Opis:
An alternative for Ordinary Portland cement (OPC) consumption is the production and integration of green cement. In other words, the clinker consumption has to be replaced with new low-carbon binders. A possible solution was introduced by the geopolymerisation technology. However, the alkaline activation of geopolymers offers the possibility of obtaining greener materials with high properties, superior to OPC, but due to the high price of sodium silicate, their industrial use is limited. In the past few years, a new activator has been discovered, namely phosphoric acid. This study approaches the obtaining of coal ash-based geopolymers activated with acid solution cured at room temperature. Accordingly, phosphoric acid, 85% by mass, was diluted in distilled water to obtain a corresponding activation solution for H3PO4/Al2O3 ratio of 1.0 and two types of geopolymers were ambient cured (22°C ±2°C). Moreover, to evaluate the geopolymerisation potential of this system (coal ash - phosphoric acid), SEM and EDS analysis was performed to investigate their morphologic characteristics.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 595--600
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Sintering Temperature on the Microstructure of Coal-Ash Based Geopolymers
Autorzy:
Burduhos-Nergis, Dumitru Doru
Vizureanu, Petrica
Achitei, Dragos C.
Sandu, Andrei Victor
Burduhos-Nergis, Diana Petronela
Abdullah, Mohd Mustafa Al Bakri
Powiązania:
https://bibliotekanauki.pl/articles/28032460.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
geopolymers
alkali activation
microstructural analysis
sintered structures
high temperature exposure
Opis:
Currently, one of the main challenges of civil engineering and science materials engineers is to develop a sustainable substitute for Ordinary Portland Cement. While the most promising solution is provided by the geopolymerisation technology, most of the studied geopolymers are based on natural raw materials (kaolin). The metakaolin is mainly preferred because of its rapid rate of dissolution in the activator solution, easy control of the Si/Al ratio, and white color. However, its high cost prevents it from being widely used in geopolymer composites or other materials that can become an industrial alternative for Ordinary Portland Cement. Several studies have shown that geopolymers with good performance can also be obtained from secondary raw materials (industrial wastes such as coal ash or slag). This explains why countries with rapidly developing economies are so interested in this technology. These countries have significant amounts of industrial waste and lack a well-developed recycling infrastructure. Therefore, the use of these by-products for geopolymers manufacturing could solve a waste problem while simultaneously lowering virgin raw material consumption. This study evaluates the effect of replacing different amounts of coal ash with sand on the microstructure of sintered geopolymers. Accordingly, scanning electron microscopy and energy dispersive X-ray analysis were involved to highlight the morphological particularities of room-cured and sintered geopolymers.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 631--637
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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