Search results for "etna"
showing 10 items of 193 documents
Clay minerals, oxyhydroxide formation, element leaching and humus development in volcanic soils
2008
Aweathering sequence with soils developing on volcanic, trachy-basaltic parent materials with ages ranging from 100–115,000 years in the Etna region served as the basis to analyse and calculate the accumulation and stabilisation mechanisms of soil organic matter (SOM), the transformation of pedogenic Fe and Al, the formation and transformation of clay minerals, the weathering indices and, by means of mass-balance calculations, net losses of the main elements. Although the soils were influenced by ash depositions during their development and the soil on the oldest lava flow developed to a great extent under a different climate, leaching of elements and mineral formation and transformation co…
A two-component mantle source feeding Mt. Etna magmatism; insights from the geochemistry of primitive magmas.
2014
The major elements, trace elements and Sr and Nd isotopes of selected Etnean primitive rocks (b15 ky BP) were studied in order to characterize their mantle source. The noble-gas geochemistry of fluid inclusions in minerals fromthe same lavaswas also investigated. Themajor element compositions ofwhole rocks and minerals showed that these products are among the most primitive atMt. Etna, comprising 6.3–17.5 wt.% MgO. The variable LREE (Light Rare Earth Elements) enrichment relative to MORB (Mid-Ocean Ridge Basalt) (Lan/Ybn = 11–26), togetherwith the patterns of certain trace-element ratios (i.e., Ce/Yb versus Zr/Nb and Th/Y versus La/Yb), can be attributed to varying degrees of melting of a c…
Discourse-based evaluation and quality management in higher education institutions: a German-Vietnamese case study of the collegial audit
2020
This article presents experiences and conclusions of an audit approach that focuses on the thesis that universities can gain most from external impulses when actively acquired and adapted by partic...
Rain-ash interaction during paroxysmal events as potential input of toxic trace element in the environment: example from Mt. Etna Volcano
2012
The impact of volcanogenic emissions of major and trace elements at Mt. Etna, Sicily, on precipitation (rain and snow) chemistry
2009
Suicide and Ambient Temperature: A Multi-Country Multi-City Study
2019
Background: Previous literature suggests that higher ambient temperature may play a role in increasing the risk of suicide. However, no multi-country study has explored the shape of the association and the role of moderate and extreme heat across different locations. Objectives: We examined the short-term temperature–suicide relationship using daily time-series data collected for 341 locations in 12 countries for periods ranging from 4 to 40 y. Methods: We conducted a two-stage meta-analysis. First, we performed location-specific time-stratified case-crossover analyses to examine the temperature–suicide association for each location. Then, we used a multivariate meta-regression to combine t…
Chapter 9. Scalar implicatures and the semantics of wh-indefinites in Vietnamese
2019
Kuka oli Lucilius? : tutkielma Senecan moraalikirjeiden vastaanottajasta
2007
Roomalaisen valtiomiehen ja filosofin, Lucius Annaeus Senecan (n. 5 eaa.-65 jaa.), ystävälleen Luciliukselle omistama kirjekokoelma Epistulae morales on yksi latinankielisen kirjallisuuden merkittävimpiä teoksia. Seneca vastaavasti on hopealatinan ajan kirjallisuuden merkittävimpiä auktoreita. Kokoelman kirjeet on kirjoitettu Senecan viimeisinä elinvuosina ja niiden asiasisältö on pääasiassa filosofinen. Tutkielmassani selvitän kirjekokoelmasta löytyviä esimerkkejä avaamalla kysymystä siitä, oliko Senecan ja Luciliuksen välinen kirjeenvaihto reaalista vai oliko kirjemuoto vain Senecan käyttämä tyylikeino. Kokoelmasta on löydettävissä kumpaakin argumenttia tukevia näytteitä. Senecan kirjeide…
Seed germination reports of high mountain species native to Mount Etna (Sicily)
2020
The germination ability of five endemic species from the high mountain belt of Mt. Etna were studied; they are Astragalus siculus, Erysimum etnense, Senecio squalidus subsp. aethnensis, Silene italica subsp. sicula, and Tanacetum vulgare subsp. siculum. Mature seeds were collected in the field, within an elevation range of 1700–2000 m a.s.l. Different experimental conditions were tested and the best methods with optimal germination results are provided and compared for each species. First germination records are given for 4 out of 5 of the investigated taxa.