Search results for "Migration"

Influence of crystal defects on the electromigration of the hydrogen in palladium

2001

Abstract Electromigration and diffusion of hydrogen in palladium defected through quenching to liquid nitrogen temperature were investigated. It was found that the obtained experimental results cannot be described by means of a single flux of hydrogen which diffuses in a gradient of electric field. In order to effectively explain the obtained results, a theoretical model was elaborated. It assumed the existence of the following two fluxes of hydrogen in the quenched metal: • Ji—of migration, according to the interstitial mechanism, and • Ji–d—of migration, according to the interstitial-defective mechanism. Dependence of effective valences and diffusion coefficients for both mechanisms of tr…

Remittance behaviours of foreigners in Italy

2013

This paper intends to figure out why immigrants remit, what characteristics they have and, in particular, which of these individual characteristics influence (and in what sense) their remittance behaviours. In particular, it aims to verify the existence of a "time effect" during the migration process. The time effect supposes that the propensity and amount of remittances become less consistent as far as the immigrant integrates into the host country and the ties with the country of origin become less intense. In practice, according to this hypothesis, the evolution of the migration plan towards stabilisation in the new country, rather than to return home, would lead the migrant to invest mo…

First Data on the Molecular Phylogeography of Scincid Lizards of the Genus Mabuya

2000

A 487-bp fragment of the mitochondrial 16S rRNA gene was sequenced in 26 species of the circumtropical lizard genus Mabuya and used to analyze phylogenetic relationships within the genus. The species from Africa and Madagascar formed a monophyletic group relative to the included Asian and South American taxa. The Malagasy species included (M. elegans, M. cf. dumasi, and M. comorensis) did not appear as a monophylum. Combined and separate analysis of the 16S data and additional sequences of the mitochondrial 12S rRNA, ND4, and cytochrome b genes (a total of 2255 bp) in one Asian, two Malagasy, and two African species also did not result consistently in a monophyletic grouping of the Malagasy…

Inside the Radical Right: The Development of Anti-Immigrant Parties in Western Europe

2012

Inside the Radical Right: The Development of Anti-Immigrant Parties in Western Europe By David Art Cambridge University Press, Cambridge, 2011, 288 pp., £60.00, ISBN 9780521896245 (hbk) Over the la...

Polska Rozgłośnia Radia Wolna Europa w Nowym Jorku

2016

First records of complete annual cycles in water rails Rallus aquaticus show evidence of itinerant breeding and a complex migration system

2020

Abstract In water rails Rallus aquaticus, northern and eastern populations are migratory while southern and western populations are sedentary. Few details are known about the annual cycle of this elusive species. We studied movements and breeding in water rails from southernmost Norway where the species occurs year-round. Colour-ringed wintering birds occurred only occasionally at the study site in summer, and vice versa. Geolocator tracks revealed that wintering birds (n = 10) migrated eastwards in spring to breed on both sides of the Baltic Sea, whereas a single breeding bird from the study site wintered in north Italy. Ambient light records of geolocator birds further indicated that all …

Filamentous fungi transported by birds during migration across the mediterranean sea.

2013

The potential for the transport and diffusion of some pathogenic microorganisms by migratory birds is of concern. Migratory birds may be involved in the dispersal of microorganisms and may play a role of mechanical and biological vectors. The efficiency of dispersal of pathogenic microorganisms depends on a wide range of biotic and abiotic factors that influence the survival or disappearance of a given agent in a geographical area. In the present study, 349 migratory birds were captured in four sites (Mazara del Vallo, Lampedusa, Ustica and Linosa), representing the main stop-over points during spring and autumnal migration, and analyzed for the presence of filamentous fungi. A total of 2,3…

Sulla pelle dei migranti

2020

Le analisi contenute nel volume dimostrano come le politiche nazionali ed europee, fortemente centrate su una logica securitaria, contribuiscano a costruire un clima sociale in cui il razzismo è diventato sistemico e strutturale. Le conseguenze di questi processi sono drammatiche non solo per le persone migranti che sperimentano sulla loro pelle una condizione di assoluta marginalità, ma anche per l’intera società e per la tenuta del sistema democratico. I saggi qui raccolti gettano luce sulle attuali forme di razzismo istituzionale e sulle ragioni per cui una fascia sempre più ampia di popolazione subisce, piuttosto passivamente, sia la campagna politico-mediatica incentrata sul “panico da…

Values, cities and migrations. Real estate market and social system in a multi-cultural city

2023

The book consists of seventeen papers in two parts. The first part, “Values and Relationship Systems in Multicultural Societies”, features how social sciences––including appraisal and valuation, urban planning, philosophy, psychology, and geography––take different approaches to studying values and relationships, converging to form a unified mosaic of complementary and interconnected knowledge. The second part, “Transformations, Permeability and Permanence of Values in Contemporary Multicultural Cities”, highlights the most crucial topics on which appraisals and models focus to interpret and represent the influence of migration on the real estate market in different urban and territorial con…

Savstarpēja migrācija starp Brazīliju, Spāniju un Portugāli: cēloņi un sekas.

2016

Globalizācija ir radījusi „pasaules ciemu” un ir radījusi ievērojamas sekas attiecībā uz sociālekonomisko jēdzienu – migrācija. Ir ļoti svarīgi saprast migrācijas procesu labumu, drošību, stabilitāti un sabiedrības pieaugumu. Dotā tēma prezentē pētījumu, kas balstīts uz Brazīlijas – Eiropas Savienības migrāciju, sevišķi, ar divām kultūrlīdzīgām valstīm, kā Spānija un Portugāle. Ņemot vērā faktu, ka šī migrācījas plūsma nav tikusi plaši pētīta, darba autore sniegs ieskatu par šo jautājumu, tostarp vairākus teorētiskus apsvērumus, statistikas datus, migrācijas plūsmas analīze, kā arī migrantu personiskā pieredze un integrācijas stāsti. Šī pētījuma unikālisms ir tas, ka tas ir vērsts ne tikai …