Search results for "PES"
showing 10 items of 5212 documents
Age of precarity : segmentation patterns in Rhone-Alps economic branches
2010
29 p.; Our paper analyse the evolution of the main labour variables in French region of Rhône-Alps for different age groups. We carry out an empirical analysis of the evolution of the labour segmentation patterns between 1995 and 2007, based on administrative records. Our aim is to compare evolution of regional employment model by age groups, sex and economic branches. We analyse inequalities in wages and contract-stability, in a global point of view and focusing in the emergent tertiary sectors of tourism, transport and personal services. We conclude that general destabilisation and new global and sectoral segmentation patterns have to be considered by age groups as a relevant aspect to un…
Britain through American eyes : a comparative study of two traveller's accounts
2004
Semi-natural habitats in boreal Europe: a rise of a social-ecological research agenda
2021
The European continent contains substantial areas of semi-natural habitats, mostly grasslands, which are among the most endangered habitats in Europe. Their continued existence depends on some form of human activity, for either production or conservation purposes, or both. We examined the share of semi-natural grasslands within the general grassland areas in boreal Europe. We reviewed research literature across the region to compile evidence on semi-natural grasslands and other semi-natural habitats, such as wooded pastures, in respect to a range of topics such as ecology, land-use change, socioeconomics, and production. We also explored drivers of the research agenda and outlined future re…
Makrofītu kā bioloģiskās kvalitātes indikatoru vērtējums Latvijas-Lietuvas pārrobežu upju baseinos
2016
Upena-Rasuma I. 2016. Maģistra darbs. Rīga, Latvijas Universitāte, 70 lpp. Maģistra darba mērķis ir makrofītu kā ekoloģiskās kvalitātes indikatoru izmantošanas iespēju izvērtējums Lielupes un Ventas baseinu upju posmos teorijā un praksē. Darbā veikti upju veģetācijas pētījumi, apsekojot 40 upju posmus Ventas un Lielupes baseinu vidēji lielās upēs, raksturotas Latvijā un Lietuvā izmantotās makrofītu pētījumu metodes un sugu trofijas indeksi, analizētas to izmantošanas iespējas un ticamības līmenis, priekšrocības un trūkumi teorijā un praksē, kā arī izvērtēta makrofītu loma Ūdens struktūrdirektīvas ietvaros. Rezultātu daļā sniegts ekoloģiskās kvalitātes novērtējuma izvērtējums, kā arī ieteiku…
Hydrogen isotopes (δ2H) of polyunsaturated fatty acids track bioconversion by zooplankton
2022
1. Organisms at the base of aquatic food webs synthesize essential nutrients, such as omega-3 polyunsaturated fatty acids (n-3 PUFA), which are transferred to consumers at higher trophic levels. Many consumers, requiring n-3 long-chain (LC) PUFA, such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), have limited ability to biosynthesize them from the essential dietary precursor α-linolenic acid (ALA) and thus rely on dietary provision of LC-PUFA. 2. We investigated LC-PUFA metabolism in freshwater zooplankton using stable hydrogen isotopes (δ2H) of fatty acids as tracers. We conducted feeding experiments with the freshwater keystone grazer Daphnia to quantify changes in the δ2…
Benthic foodweb structure in a large shallow lake studied by stable isotope analysis
2014
The benthic foodweb structure of Lake Võrtsjärv, a large (270 km2), shallow, and turbid Estonian lake, was evaluated based on C and N stable-isotope signatures (δ13C, δ15N). Variation in δ13C between sampling sites was not related to site proximity to the littoral zone or the more vegetated southern part of the lake, but rather appeared to be influenced by in-situ site peculiarities. δ13C was stable temporally and between functional feeding groups, a result implying that the whole benthic food web of the lake relies largely on the same C source admixture, essentially particulate organic matter (POM). Thus, the foodweb composition of Lake Võrtsjärv is remarkably homogeneous given the lake’s …
Tracking mite trophic interactions by multiplex PCR
2020
Background A thorough knowledge of trophic webs in agroecosystems is essential to achieve successful biological pest control. Phytoseiid mites are the most efficient natural enemies of tetranychid mites, which include several important pests worldwide. Nevertheless, phytoseiids may feed on other food sources including other microarthropods, plants and even other phytoseiids (intraguild predation), which can interfere with biological control services. Molecular gut content analysis is a valuable tool for characterizing trophic interactions, mainly when working on microarthropods such as mites. We have designed new primers for Phytoseiidae, Tetranychidae and Thysanoptera identification and th…
Production of a 15C radioactive ion beam based on 18O(n, α)
2019
In the context of the SPIRAL2 radioactive beam facility the production rate of the neutron-rich 15C nucleus by 18O(n,α) has been investigated. In a water target of 20 cm3, enriched in 18O and placed behind the neutron converter, a rate of a few 1010 nuclei per second can be reached with 1mA of 40MeV deuterons. A 18O(n,α) cross-section based on the activation method is proposed. It is intermediate between the highest and lowest evaluations available to date. peerReviewed
Språkstrategier och familjespråkpolicy hos tre tvåspråkiga familjer i ett finskspråkigt område
2012
Tämä maisterintutkielma on katsaus kolmen kaksikielisen perheen kielelliseen arkeen yksikielisellä alueella. Tutkimuksemme tarkoituksena on haastattelujen ja nauhoitusten avulla tarkastella, käyttävätkö perheet tietynlaisia kielistrategioita ja miten perheiden kielelliset toimintaperiaatteet ilmenevät ja muovautuvat kommunikaatiotilanteissa. Tutkimusaineisto kerättiin laadullisin menetelmin kahdessa osassa. Ensin haastateltiin perheiden vanhempia koskien heidän kielellisiä taustojaan, kaksikielistä arkea kielivalintoineen sekä ajatuksia lasten kaksikielisyydestä ja tulevaisuudesta. Tutkimuksen toisessa osassa vanhemmat nauhoittivat perheen arkipäiväisiä keskusteluja vaihtelevissa ympäristöi…
Analysis of corrective feedback in a multilingual classroom context from a CLIL perspective.
2017
Esta tesis doctoral analiza el feedback correctivo en una clase plurilingüe desde una perspectiva CLIL. El objetivo de este estudio es examinar el feedback que tiende a ser utilizado cuando se corrigen los errores orales en clase comparando diferentes asignaturas, todas ellas impartidas en lengua inglesa. Para ello se analiza la relación entre tipos de feedback y tipos de errores en diferentes asignaturas. Lo que se intenta averiguar es qué estrategias normalmente se eligen para corregir, qué tipo de error es el más frecuente y si hay alguna relación entre tipo de error, el feedback utilizado y la asignatura. Para el estudio se realizaron grabaciones de las clases con video cámara. Las asig…