Search results for " Migration"
showing 10 items of 754 documents
Determination of 60 Migrant Substances in Plastic Food Contact Materials by Vortex-Assisted Liquid-Liquid Extraction and GC-Q-Orbitrap HRMS
2021
A GC-HRMS analytical method for the determination of 60 migrant substances, including aldehydes, ketones, phthalates and other plasticizers, phenol derivatives, acrylates, and methacrylates, in plastic food contact materials (FCM) has been developed and validated. The proposed method includes migration tests, according to Commission Regulation (EU) 10/2011, using four food simulants (A, B, C, and D1), followed by vortex-assisted liquid–liquid extraction (VA-LLE) and GC-Q-Orbitrap HRMS analysis in selected ion monitoring (SIM) mode, with a resolving power of 30,000 FWHM and a mass accuracy ≤5 ppm. The method was validated, showing satisfactory linearity (R2 ≥ 0.98 from 40 to 400 …
Tracking migration of black‐headed buntings Emberiza melanocephala reveals the Iranian Plateau as an ecological barrier along the Indo‐European flyway
2021
The black-headed bunting is one of the few species that migrate along the Indo-European flyway, and its migration routes and phenology are poorly understood. We provide the first individual-based year-round tracking study describing route choice and timing of black-headed buntings migrating from a breeding site in Croatia to a 6000 km distant non-breeding region in Maharashtra, central India. To evaluate landscapes important for the black-headed bunting migration, we quantified land covers and climates along the migration corridor. Stopover areas during the post-breeding migration were concentrated in four distinct regions: the Balkan Peninsula, central Anatolia, along with the Zagros mount…
Diel variability in counts of reef fishes and its implications for monitoring
2006
Studies of reef fish assemblages in space rarely consider the effects of temporal variability on spatial comparisons, and when they do, usually examine timescales of months to years. The nature of fish monitoring surveys is such that particular locations may be surveyed at one time of day, and surveys designed to establish the degree of spatial variability in assemblages may be confounded if the order of sampling within treatments is not randomised with respect to time of day. In this study, we tested the degree of temporal variability in temperate reef fish counts at the same sites in New Zealand and Italy, within and between days. Repeated counts separated by months returned quite differe…
International Student Migration in Finland
2021
There is increasing attention on the retention of international students with many stakeholders desiring to keep international students for long-term economic growth. This study examines the factors affecting international students to stay in Finland five years after initial enrolment with particular focus on the role graduation plays in students staying or leaving. Tracking 11 (years) entering cohorts for five years across national (Finland) data registries, we found evidence of an inverse relationship between graduation, degree type, and the probability of staying; higher the degree level of graduation, the decrease in probability an international student stays. We conclude that while gra…
Intra-regional mobility of PhD students in the European Union : the outcomes of region-making policy?
2022
This paper examines the flow of intra-European Union (EU) students for doctoral (PhD) studies to identify reasons for differences in international student mobility and migration (ISM) among member states. Rather than conceptualising intra-EU PhD student ISM only through push–pull forces, we theorise the intra-EU PhD ISM is associated with relative levels of national resources or levels of capital. We investigate the intra-EU PhD ISM through dyadic country pairings allowing the use of Gravity models to estimate the effect of variables associated with stocks of capital ascribed to a country to the change in the number of PhD students. The findings of this study indicate while there is asymmet…
Habiter la jungle de Calais
2017
Mentre la politica di smantellamento dei campi di migranti continua, Éléonore Bully ripensa alle condizioni di vita nella "giungla di Calais" prima della sua distruzione nel 2016. Lei dimostra che, nonostante la precarietà dell'insediamento, le pratiche dei migranti ne hanno fatto un luogo di socievolezza e vita quotidiana dignitosa. Alors que la politique de démantèlement des campements de migrants se poursuit, Éléonore Bully revient sur les conditions d’habitat dans la « jungle de Calais » avant sa destruction en 2016. Elle montre que, malgré la précarité de l’installation, les pratiques des migrants en ont fait un lieu de sociabilité et de vie quotidienne digne.
Biological Effects of New Hydraulic Materials on Human Periodontal Ligament Stem Cells.
2019
Background: The aim of this study was: to evaluate the biological properties of new hydraulic materials: Bio-C Repair and Bio-C Sealer. Methods: Periodontal ligament stem cells were exposed to several dilutions of Bio-C Repair and Bio-C Sealer. The ion release profile and pH were determined. Metabolic activity, cell migration and cell survival were assessed using the 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT), wound-healing assays and Annexin assays, respectively. Cells were cultured in direct contact with the surface of each material. These were then analyzed via scanning electron microscopy (SEM) and energy dispersive X-ray (EDX). Statistical differences were ass…
Migrācijas ietekme uz darba tirgu Latvijā
2017
Bakalaura darba tēma ir "Migrācijas ietekme uz darba tirgu Latvijā" Pētījuma izstrādes mērķis ir identificēt nozīmīgākos iemeslus un raksturot sekas migrācijai, un izstrādāt ieteikumus tās samazināšanai, kā arī izvērtēt kādas sekas migrācija atstāj uz uzņēmējdarbību. Pēc Latvijas iestāšanās Eiropas Savienībā, pieauga Latvijas iedzīvotāju emigrācija uz citām valstīm, līdz ar to Latvija saskaras ar „smadzeņu aizplūdi” un darbaroku trūkumu, dažkārt pārpalikumu. Pētījuma ietvaros ir veikta zinātnisko materiālu, informācijas dažādās publikācijās, aptaujas un interviju izpēte un tās iegūtās informācijas apstrāde un analīze. Empīriski pētnieciska daļa sastāv no Latvijas iedzīvotāju un aizbraukušo …
O Brasil na rota das migrações internacionais qualificadas espanholas no século XXI
2018
In order to understand recent migration, it is crucial to analyze the migratory modalities such as skilled international migration to Brazil, especially considering the ongoing transnational economic processes and their effects on the corresponding societies. Therefore, this article seeks to understand how the migratory dynamics of highly skilled Spanish professionals to the country are established taking into account the theoretical contribution of the circulation of brains and the category of knowledge workers. For this purpose, information from Brazilian?s Ministry of Labor is used on labor authorizations, financial contributions and insertion in the formal market in Spain; as well as da…
Associations among immigrants at the crossroads.Transnational action and co-option risks
2016
Resumen En este artículo tratamos de contribuir al debate en torno al papel de las asociaciones de inmigrantes en las sociedades de origen y destino, así como puente entre las mismas. El creciente número y potencial de las asociaciones ha puesto de relieve su contribución al desarrollo y a la dinamización de las sociedades civiles de uno y otro lado. Sin embargo, este proceso no está exento de limitaciones y dinámicas que pueden entrar en contradicción con el papel fundacional de las mismas asociaciones. La interacción con las instituciones de los países de origen de origen y destino, y el acceso a programas y fondos públicos estatales, habría generado un escenario en el que las asociacione…