988 resultados para 172-1061
Resumo:
Kharkiv oblast, which is located in the immediate vicinity of the Donbas region, and which shares a 315-km stretch of Ukraine’s border with Russia, was one of the regions where attempts were made to kindle separatist sentiments during the spring of last year. Some central government buildings were briefly occupied by pro-Russian demonstrators who declared a ‘Kharkov People’s Republic’, but efficient countermeasures by the Ukrainian institutions of force quickly calmed the situation in the region. However, the oblast still remains a target for acts of sabotage, which are probably directed by Russian secret services. Nevertheless, the situation in the region is now stable, both in terms of public sentiment and local politics. The main competitors in the arena of local politics are Hennadiy Kernes, the mayor of Kharkiv, and Arsen Avakov, the current head of the Ukrainian Interior Ministry. Despite many years of hostility, neither of the politicians appears to have initiated a power struggle as yet – Kernes retains his influence on the city council, and Avakov controls the local security services.
Resumo:
Ocean circulation may have undergone reductions and reinvigorations in the past closely tied to regional climate changes. Measurements of 231Pa/230Th ratios in a sediment core from the Bermuda Rise have been interpreted as evidence that the Atlantic Meridional Overturning Circulation (AMOC) was weakened or completely eliminated during a period of catastrophic iceberg discharges (Heinrich-Event 1, H1). Here we present new data from the Bermuda Rise that show further 231Pa/230Th peaks during Heinrich-2 (H2) and Heinrich-3 (H3). Additionally, a tight correlation between diatom abundances (biogenic silica) and 231Pa/230Th is discovered in this core. Our results redirect the interpretation of 231Pa/230Th from the Bermuda Rise as a proxy for ocean circulation towards a proxy that reacts highly sensitive to changes of particle composition and water mass properties.
