995 resultados para Baltic states
Resumo:
Sweden finds itself in the midst of the most heated debates about defence policy and the direction of military reforms since the end of the Cold War, as Stockholm faces the challenge of finding a new military security formula. From the Swedish point of view, the post-Cold War strategic timeout in Europe is coming to an end. The international environment is reverting to a situation in which the use of force among states is no longer an improbable scenario. Stockholm cannot rule out the emergence of crises or conflicts in Northern Europe in the future, which could directly or indirectly affect Sweden. In this context, the transformations of Sweden’s defence policy over the past twenty years have become a problem. Sweden has moved from neutrality, i.e. non-involvement on any side of an armed interstate conflict, to non-alignment, whereby it stays outside military alliances and freely shapes its policies during wartime. It has joined the European Union and co-operates closely with NATO on foreign missions. Its ability to defend its own territory, however, has diminished.
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Norway is currently the only Western European state and ‘old’ NATO member that strongly relies on the traditional dimension of NATO's collective defence. It is also the only ally in Western Europe which perceives Russia as a threat to its military security, in the so-called High North. In order to successfully deal with the potential challenges and threats in the region, Norway has been pursuing a defence policy based on cooperation and deterrence. Cooperation means improving collaboration with Russia in cross-border relations, in the petroleum sector and in the military sphere. The deterrent measures include maintaining NATO’s credibility as a collective defence alliance; increasing military cooperation with the United States; building up Norway’s own military capabilities; and developing military cooperation across Northern Europe. The primary objective of Oslo’s defence policy is to minimise the likelihood of crises and conflicts emerging in the High North which could prove too ‘big’ for Norway but too ‘small’ for NATO.
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Germany is one of the eight EU member states which participate in the EU Strategy for the Baltic Sea Region along with Denmark, Estonia, Finland, Latvia, Lithuania, Poland and Sweden. Germany had a positive approach to the EUSBSR strategy (see Appendix 1) right from planning stage. This project contributed to the continuation of Germany’s co-operation with the countries in this region, which has been conducted since the mid 1980s mainly by German federal states. Germany is playing a major role as part of this strategy because it is the coordinator of its three priority areas.However, the German federal government sees the EUSBSR as a project to be implemented at the level of federal states. This has been proven by the great activity of three German federal states participating in the strategy (Hamburg, Mecklenburg-Vorpommern and Schleswig-Holstein) and at the same time the low level of engagement from the Bundestag, the federal government and expert circles. Furthermore, federal states more often formulate evaluations of the effects of co-operation achieved so far as part of the EUSBSR. Still, the relatively low level of Berlin’s engagement does not mean that it is not interested in co-operation in the Baltic region as such. Germany actively participates in the work of such bodies as the Council of the Baltic Sea States or the Baltic Marine Environment Protection Commission (HELCOM). All German entities engaged in the strategy make its future attractiveness and the success of individual projects as part of it dependent on including Russia in the EUSBSR. As long as Germany has the opportunity of regional co-operation with Russia at other forums (for example, the Council of the Baltic Sea States), it is unlikely to become more engaged in developing the strategy and enhancing co-operation as part of this project.
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Russia’s increasingly aggressive policy and its enhanced military activity in the Nordic-Baltic region has led to revaluations in Sweden’s and Finland’s security and defence policies and a rethinking of the formats of their military co-operation. While remaining outside NATO, the two states have been developing closer bilateral defence co-operation and working more closely with the United States, while at the same time developing co-operation with NATO. Sweden and Finland perceive the United States as the guarantor of regional and European security. From their point of view, the United States is currently the country that has both the necessary military capabilities and the political will to react in the event of a conflict between Russia and NATO in the Nordic-Baltic region, in which both countries would inevitably become involved despite their non-aligned status. For Sweden and Finland, intensified co-operation with the United States offers an alternative to NATO membership, which is currently out of the question for domestic political reasons. Meanwhile, the US has also become increasingly aware of the strategic importance of the two states, which, for the purposes of contingency planning, are in fact an extension of NATO’s north-eastern flank.
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We report on the shape resonance spectra of phenol-water clusters, as obtained from elastic electron scattering calculations. Our results, along with virtual orbital analysis, indicate that the well-known indirect mechanism for hydrogen elimination in the gas phase is significantly impacted on by microsolvation, due to the competition between vibronic couplings on the solute and solvent molecules. This fact suggests how relevant the solvation effects could be for the electron-driven damage of biomolecules and the biomass delignification [E. M. de Oliveira et al., Phys. Rev. A 86, 020701(R) (2012)]. We also discuss microsolvation signatures in the differential cross sections that could help to identify the solvated complexes and access the composition of gaseous admixtures of these species.
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The aim of this work was to characterize the effects of partial inhibition of respiratory complex I by rotenone on H2O2 production by isolated rat brain mitochondria in different respiratory states. Flow cytometric analysis of membrane potential in isolated mitochondria indicated that rotenone leads to uniform respiratory inhibition when added to a suspension of mitochondria. When mitochondria were incubated in the presence of a low concentration of rotenone (10 nm) and NADH-linked substrates, oxygen consumption was reduced from 45.9 ± 1.0 to 26.4 ± 2.6 nmol O2 mg(-1) min(-1) and from 7.8 ± 0.3 to 6.3 ± 0.3 nmol O2 mg(-1) min(-1) in respiratory states 3 (ADP-stimulated respiration) and 4 (resting respiration), respectively. Under these conditions, mitochondrial H2O2 production was stimulated from 12.2 ± 1.1 to 21.0 ± 1.2 pmol H2O2 mg(-1) min(-1) and 56.5 ± 4.7 to 95.0 ± 11.1 pmol H2O2 mg(-1) min(-1) in respiratory states 3 and 4, respectively. Similar results were observed when comparing mitochondrial preparations enriched with synaptic or nonsynaptic mitochondria or when 1-methyl-4-phenylpyridinium ion (MPP(+)) was used as a respiratory complex I inhibitor. Rotenone-stimulated H2O2 production in respiratory states 3 and 4 was associated with a high reduction state of endogenous nicotinamide nucleotides. In succinate-supported mitochondrial respiration, where most of the mitochondrial H2O2 production relies on electron backflow from complex II to complex I, low rotenone concentrations inhibited H2O2 production. Rotenone had no effect on mitochondrial elimination of micromolar concentrations of H2O2. The present results support the conclusion that partial complex I inhibition may result in mitochondrial energy crisis and oxidative stress, the former being predominant under oxidative phosphorylation and the latter under resting respiration conditions.
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Universidade Estadual de Campinas . Faculdade de Educação Física
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The [Ru3O(Ac)6(py)2(CH3OH)]+ cluster provides an effective electrocatalytic species for the oxidation of methanol under mild conditions. This complex exhibits characteristic electrochemical waves at -1.02, 0.15 and 1.18 V, associated with the Ru3III,II,II/Ru3III,III,II/Ru 3III,III,III /Ru3IV,III,III successive redox couples, respectively. Above 1.7 V, formation of two RuIV centers enhances the 2-electron oxidation of the methanol ligand yielding formaldehyde, in agreement with the theoretical evolution of the HOMO levels as a function of the oxidation states. This work illustrates an important strategy to improve the efficiency of the oxidation catalysis, by using a multicentered redox catalyst and accessing its multiple higher oxidation states.
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The possible states in the flow around two identical circular cylinders in tandem arrangements are investigated for configurations in the vicinity of the drag inversion separation. By means of numerical simulations, the hysteresis in the transition between the shedding regimes is studied and the relationship between (three-dimensional) secondary instabilities and shedding regime determination is addressed. The differences observed in the behavior of two- and three-dimensional flows are analyzed, and the regions of bistable flow are delimited. Very good agreement is found between the proposed scenario and results available in the literature. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3420111]
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Let omega be a factor state on the quasilocal algebra A of observables generated by a relativistic quantum field, which, in addition, satisfies certain regularity conditions [satisfied by ground states and the recently constructed thermal states of the P(phi)(2) theory]. We prove that there exist space- and time-translation invariant states, some of which are arbitrarily close to omega in the weak * topology, for which the time evolution is weakly asymptotically Abelian. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3372623]
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We observe zero-differential resistance states at low temperatures and moderate direct currents in a bilayer electron system formed by a wide quantum well. Several regions of vanishing resistance evolve from the inverted peaks of magneto-intersubband oscillations as the current increases. The experiment, supported by a theoretical analysis, suggests that the origin of this phenomenon is based on instability of homogeneous current flow under conditions of negative differential resistivity, which leads to formation of current domains in our sample, similar to the case of single-layer systems.