Search results for "opas"

Environmental responses of past and recent agropastoral activities on south Greenlandic ecosystems through molecular biomarkers

2016

Paleoenvironmental studies previously performed on Lake Igaliku revealed two agropastoral phases in south Greenland: the Norse settlement from AD 986 to ca. AD 1450 and the recent installation of sheep farmers, since the 1920s. To improve the knowledge of the timing and magnitude of the Greenlandic agropastoral activities, a lipid inventory was realized and compared with biological and geochemical data. During the 12th century, a major increase in deoxycholic acid (DOC) and coprophilous fungal spores revealed a maximum of herbivores. Synchronously, a minimum of the n-C29/ n-C31 alkane ratio and tree and shrub pollen and a maximum of triterpenyl acetates showed a reduction in the tree and s…

Grazing and abandonment determine different tree dynamics in wood-pastures

2016

Wood-pastures are threatened biotopes in which trees and livestock grazing maintain high conservation values. However, browsing may threaten tree regeneration, whereas abandonment leads to tree encroachment. We studied the regeneration of trees in a grazed and abandoned boreal wood-pastures. In grazed sites, the density of young spruces (Picea abies) was high, while the density of young birches (Betula spp.) was very low. Sprucification can be prevented only by removing spruces. The number of young birches and pines (Pinus sylvestris) was correlated with the number of junipers (Juniperus communis), probably because thorny junipers protect palatable seedlings from browsing. In abandoned site…

Grazing and soil pH are biodiversity drivers of vascular plants and bryophytes in boreal wood-pastures

2016

Abstract Wood-pastures have been formed by traditional low-intensity livestock grazing in wooded areas. They host high biodiversity values that are now threatened by both management abandonment (ceased grazing) and agricultural intensification, and therefore these habitats are of conservation interest in Europe. In order to explore the effects of grazing on the biodiversity of boreal wood-pastures, we studied the communities of vascular plants and bryophytes in 24 currently grazed and 24 abandoned sites. In addition to the current management situation, we studied the effects of soil pH and moisture, tree density, historical land-use intensity, time since abandonment (in abandoned sites) and…

Bush, Sharon y los suyos

2004

Se trata de la versión mecanografiada del artículo publicado en "El País" el 16 de abril de 2004, pero debe aclararse que el texto es exactamente igual al publicado, únicamente cambia el título: "Los terminator de la democracia".

Fluvial activity of the late-glacial to Holocene “Bergstraßenneckar” in the Upper Rhine Graben near Heidelberg, Germany – first results

2022

Abstract. The term “Bergstraßenneckar” (BSN) refers to an abandoned course of the river Neckar. It flowed in a northern direction east of the river Rhine in the eastern part of the northern Upper Rhine Graben in southwestern Germany. The former meandering course merged with the Rhine ca. 50 km further north of the site of the present-day confluence near Mannheim. The palaeo-channels are still traceable by their depressional topography, in satellite images and by the curved boundaries of adjacent settlements and land parcels. In the plan view, satellite and aerial images reveal a succession of meander bends, with older bends being cut off from younger channels. Based on stratigraphic investi…

Noslēdzies projekts Eiropas Dialogi

2003

Akadēmiskā Dzīve, 51. rakstu krājums

2015

Procesuālais taisnīgums

1998

Tiesu prakses veidošana

2001

Krājums sastāv no četrām nodaļām: 1. Latvijas tiesu prakses vēsture, 2. Tiesu prakse mūsdienās, 3.Satversmes tiesas spriedumi, 4. Eiropas Savienības tiesu prakse.

Tritija uzkrāšanas Apvienotā Eiropas Tora vakuuma kameras sienu berilija materiālos

2015

Tritija uzkrāšanās Apvienotā Eiropas Tora vakuuma kameras sienas berilija materiālos. Igaune I., zinātniskā vadītāja: Dr.ķīm. Pajuste E., Bakalaura darbs, 47 lappuses, 21 attēls, 8 tabulas, 51 literatūras avots. Latviešu valodā. Darbā optimizēta un pielietota metodika tritija sadalījuma noteikšanai JET vakuuma kameras berilija materiāliem, kā arī novērtētas virsmas un ķīmiskā sastāva izmaiņas tiešas plazmas un neitronu starojuma iedarbībā. Darbā izmantotas Skenējošo elektronu mikroskopijas, Dispersās enerģijas rentgenstaru spektroskopijas, šķīdināšanas metodes un radiometriskās metodes tritija mērījumiem – gāzu jonizācijas un scintilācijas metodes.