Search results for "PET"
showing 10 items of 12749 documents
Geochemistry of REE, Zr and HF in a wide range of pH and water composition: The Nevado del Ruiz volcano hydrothermal system (Colombia)
2015
International audience; The geochemical behaviour of Rare Earth Elements, Zr and Hf was investigated in the thermal waters of Nevado del Ruiz volcano system. A wide range of pH, between 1.0 and 8.8, characterizes these fluids. The acidic waters are sulphate dominated with different Cl/SO4 ratios. The important role of the pH and the ionic complexes for the distribution of REE, Zr and Hf in the aqueous phase was evidenced. The pH rules the precipitation of authigenic Fe and Al oxyhydroxides producing changes in REE, Zr, Hf amounts and strong anomalies of Cerium. The precipitation of alunite and jarosite removes LREE from the solution, changing the REE distribution in acidic waters.Y–Ho and Z…
Biodiversity, evolution and adaptation of fungi in exstreme environments
2013
Fungi play irreplaceable roles for ecosystem functioning. They may adopt different life styles, for example saprotrophs, symbionts or parasites: some species are cosmopolitan with a wide distribution and others, thanks to they ecological plasticity, may adapt to harsh environments precluded to most of life forms. In stressing conditions, their role is even more crucial for the recycling of organic matter or favouring nutrients uptake. When the conditions become really extreme and competion is low, fungi focus on extremotollerance and evolve peculiar competences to exploit natural or xenobiotic resources in the particular constraints imposed by the environment. This paper focuses on three di…
A Post-contentious Turning Point for the Contentious French? Crisis Without Protest in France
2018
International audience; This chapter shows that the ‘contentious French’ may not be that contentious anymore. The economic crisis provides a unique chance to argue that a post-contentious turning point is emerging in spite of a long-standing tradition of protesting. Yet the chapter suggests that this post-contentious turning point is not bringing about acquiescence but opens space for new forms of political participation, especially in connection with resources acquired through employment and educational track. In this case, we find a more extensive engagement in online activism and non-institutional forms of political participation, that is, the two forms of political participation that ar…
Shareholder Wealth Creation in Response to Announcements of Acquisitions of Unlisted Firms: Evidence from Spain
2011
We investigate shareholder value creation of Spanish listed firms in response to announcements of acquisitions of unlisted companies and compare this experience to the purchase of listed firms over the period 1991–2006. Similar to foreign markets, acquirers of listed targets earn insignificant average abnormal returns, whereas acquirers of unlisted targets gain significant positive average abnormal returns. When we relate these results to company and transaction characteristics our findings diverge from those reported in the literature for other foreign markets, as our evidence suggests that the listing status effect is mainly associated with the fact that unlisted firms tend to be smaller …
Pēterburgas Zinātņu akadēmijas rakstu krājumi Latvijas Universitātes Muzejā
2019
Latvijas Universitātes Muzeja Botānikas un mikoloģijas kolekcijās glabājas Pēterburgas Zinātņu akadēmijas 18. gs. beigās – 19. gs. sākumā izdotā rakstu krājuma 27 sējumi - Acta Academiae Scientiarum Imperialis Petropolitanae (12 sējumi) un Nova Acta Academiae Scientiarum Imperialis Petropolitanae (15 sējumi). Raksts satur informāciju par Pēterburgas Zinātņu akadēmijas izveidi un rakstu krājuma publikāciju visražīgākajiem autoriem.
Deciphering la drammatica
2014
Combining metrical structure with gesture and expressiveness, the nineteenth-century Italian actors drew a distinguished form of acting, to which they referred as la drammatica, that was based on a system of vocal modulation. La voce apposita was the predominant drammatica declamation symbol. It signalled an opening voice, or key-voice, which imposed grades and intonations on emotions. The drammatica included four dominant types of voce apposita. The leading actor/actress of a company as well as actor-manager (capocomico) portrayed his/her roles and effected his/her acting fellows’ work. When properly applied, the four types of voce apposita produced a spontaneous and attractive recitation.…
A radiometric and petrographic approach to risk assessment at Alte Madonie Mounts region (Sicily, Italy)
2013
The main goal of this work was to assess the radiological hazard at Alte Madonie Mounts region (north-central Sicily, Italy) in response to rumours of an increase in the incidence of cancer in this area. A correlation between the natural radionuclide contents and the petrographic features of the soil and rock samples was also evaluated. A total of 41 samples of selected soils and rocks were collected, powdered, dried and sealed in 'Marinelli' beakers for 20 d prior to measurement to ensure that a radioactive equilibrium between (226)Ra and (214)Bi had been reached. A gamma-ray spectrometer was used to quantify the radioactivity concentrations. To determine (238)U and (232)Th activities, the…
Dropping out of school as a meaningful action for adolescents with social, emotional and behavioural difficulties
2013
This study examines and discusses dropping out of school related to adolescents with social, emotional and behavioural difficulties (SEBD). It is based on in-depth interviews of 10 adolescents between the ages of 16 and 20, three girls and two boys with internalised problems, and two girls and three boys with extroverted behavioural problems. Given this group of students' challenges at school, the aim of this paper is to explore the narratives of this adolescent group as they relate to the significance they attach to their dropout behaviour. An additional objective is to draw attention to what these findings are likely to mean for implementing preventive practices in school. Results show th…
The pedagogical development of an international teacher in the cultural context of Finnish CLIL home economics
2016
This thesis draws on content and language integrated learning (CLIL) as a methodological innovation in language education. In order to become competent CLIL teachers in 21st century, however, teachers should not merely have expertise knowledge in their own teaching fields but take pedagogical tact into consideration. The aim of this qualitative action research is to understand: (1) How an international teacher from Taiwan utilized the theoretical framework of CLIL 4Cs and (2) How 4Cs were used as a support to develop pedagogical tact in CLIL home economics classes in a Finnish lower secondary school. The action research approach and process were conducted in two cycles that included plannin…
Modulation of action tremor by repetitive transcranial magnetic stimulation in multiple sclerosis patients
2014
Background: Patients affected by Multiple Sclerosis (MS) can show a tremor of their upper limbs, mostly during the performing of finalised action (action tremor) or at the maintaining of a position against gravity (postural tremor), as key clinical feature of their disease. Objectives: In order to reduce the tremor, patients underwent to repetitive transcranial magnetic stimulation (rTMS) of the primary motor cortex of left hemisphere. Methods: Eight patients affected by a middle form of MS were enrolled into the study. A standard neurological examination was carried out and the individual degree of disability was established employing the Expanded Disability Status Score (EDSS). At EDSS pa…