scholarly journals Mechanical Behaviour of a Residual Soil from Ignimbrite Rock of São Miguel Island - Azores

2021 ◽  
Vol 1203 (2) ◽  
pp. 022135
Author(s):  
Luís Andrade Pais ◽  
P. E. Maia Carvalho ◽  
Ferreira Gomes ◽  
Victor Cavaleiro ◽  
Ana Malheiro
Keyword(s):  
North Atlantic ◽  
Mechanical Characteristics ◽  
Construction Material ◽  
Pyroclastic Rock ◽  
Residual Soil ◽  
Tectonic Structures ◽  
Eastern Group ◽  
The North ◽  
Strain Behaviour ◽  
Physical And Chemical

Abstract Azores consists of nine islands and several islets, located in the North Atlantic to 1600 km from Continental Portugal and is distributed between latitudes 36° 55' to 39° 43' N and longitude 24° 46' to 31° 16' W. Azores archipelago is in a convergence zone of a series of dynamic tectonic structures, that are responsible for seismicity and volcanism, geological and petrological of these islands. The island of São Miguel, an eastern group, in addition to other petrology’s in its geology, has ignimbrite, which is a pyroclastic rock with a dacitic or rhyolitic composition, resulting from the deposition of materials in semi-melting at high temperatures from a pyroclastic flow. At the site of Água D’Alto, the residual soil sample resulting from the ignimbrite alteration was taken and was evaluated with the interest of studying its application or use as construction material. The soil was subjected to physical and chemical classification test, compressibility, and stress-strain behaviour. This material shows good mechanical characteristics, although its chemism is potentially corrosive.

The North Atlantic Ecosystem, from Plankton to Whales

2020 ◽  
Vol 12 (1) ◽  
pp. 339-359 ◽  
Author(s):  
Andrew J. Pershing ◽  
Karen Stamieszkin
Keyword(s):  
North Atlantic ◽  
Spring Bloom ◽  
Homo Sapiens ◽  
Global Climate ◽  
Terrestrial Ecosystems ◽  
Calanus Finmarchicus ◽  
The North ◽  
The North Atlantic ◽  
Physical And Chemical ◽  
Chemical Trends

Compared with terrestrial ecosystems, marine ecosystems have a higher proportion of heterotrophic biomass. Building from this observation, we define the North Atlantic biome as the region where the large, lipid-rich copepod Calanus finmarchicus is the dominant mesozooplankton species. This species is superbly adapted to take advantage of the intense pulse of productivity associated with the North Atlantic spring bloom. Most of the characteristic North Atlantic species, including cod, herring, and right whales, rely on C. finmarchicus either directly or indirectly. The notion of a biome rests inherently on an assumption of stability, yet conditions in the North Atlantic are anything but stable. Humans have reduced the abundance of many fish and whales (though some recovery is underway). Humans are also introducing physical and chemical trends associated with global climate change. Thus, the future of the North Atlantic depends on the biome's newest species, Homo sapiens.

scholarly journals New study of the 1755 earthquake source based on multi-channel seismic survey data and tsunami modeling

2003 ◽  
Vol 3 (5) ◽  
pp. 333-340 ◽  
Author(s):  
M. A. Baptista ◽  
J. M. Miranda ◽  
F. Chierici ◽  
N. Zitellini
Keyword(s):  
North Atlantic ◽  
Seismic Energy ◽  
Seismic Survey ◽  
Tectonic Structures ◽  
Tsunami Waves ◽  
The North ◽  
Lisbon Earthquake ◽  
Historical Observation ◽  
Large Effort ◽  
Central Atlantic

Abstract. In the last years, large effort has been done to carry out multi-channel seismic reflection surveys (MCS) in SW Iberia to locate the active tectonic structures that could be related to the generation of the 1755 Lisbon earthquake and the tsunami. The outcome of these researches led to the identification of a large, compressive tectonic structure, named Marques de Pombal thrust that, alone can account for only half the seismic energy released by the 1755 event. However, these investigations have shown the presence of additional tectonic structures active along the continental margin of SW Iberia that are here evaluated to model the tsunami waves observed along the coasts of Iberia, Morocco and Central Atlantic. In this paper we present a new reappraisal of the 1755 source, proposing a possible composite source, including the Marques de Pombal thrust fault and the Guadalquivir Bank. The test of the source is achieved through numerical modelling of the tsunami all over the North Atlantic area. The results presented now incorporate data from the geophysical cruises and the historical observation along the European coasts and also from the Western Indies. The results of this study will, hopefully, improve the seismic risk assessment and evaluation in the Portuguese territory, Spain, Morocco and Central/North Atlantic.

scholarly journals Upper Labrador Sea Water in the Irminger Sea during a weak convection period (2002–2006)

2009 ◽  
Vol 6 (3) ◽  
pp. 2085-2113 ◽  
Author(s):  
E. Louarn ◽  
H. Mercier ◽  
P. Morin ◽  
E. de Boisseson ◽  
S. Bacon
Keyword(s):  
North Atlantic ◽  
Sea Water ◽  
Labrador Sea ◽  
Subpolar Gyre ◽  
Chemical Tracers ◽  
The North ◽  
Irminger Sea ◽  
North Atlantic Subpolar Gyre ◽  
Physical And Chemical ◽  
Labrador Sea Water

Abstract. Four cruises between 2002 and 2006 sampled physical and chemical tracers in the southern Irminger Sea during the period of weak convection in the North Atlantic Subpolar Gyre. The upper Labrador Sea Water (uLSW) shows complex and time variable patterns reflecting different formation sites: Irminger Sea, South Greenland and Labrador Sea.

The Currents of the North Atlantic

1892 ◽  
Vol 34 (872supp) ◽  
pp. 13940-13941
Author(s):  
Richard Beynon
Keyword(s):  
North Atlantic ◽  
The North ◽  
The North Atlantic

NATO adaptation to current challenges and mechanisms of Ukraine’s cooperation with the North Atlantic Treaty Organization

2019 ◽  
pp. 73-81
Author(s):  
Oleh Poshedin
Keyword(s):  
North Atlantic ◽  
Task Force ◽  
Response Force ◽  
Cyber Attack ◽  
Adaptation Measures ◽  
Joint Force ◽  
Security Environment ◽  
The North ◽  
The North Atlantic ◽  
Area Of Influence

The purpose of the article is to describe the changes NATO undergoing in response to the challenges of our time. Today NATO, as a key element of European and Euro-Atlantic security, is adapting to changes in the modern security environment by increasing its readiness and ability to respond to any threat. Adaptation measures include the components required to ensure that the Alliance can fully address the security challenges it might face. Responsiveness NATO Response Force enhanced by developing force packages that are able to move rapidly and respond to potential challenges and threats. As part of it, was established a Very High Readiness Joint Task Force, a new Allied joint force that deploy within a few days to respond to challenges that arise, particularly at the periphery of NATO’s territory. NATO emphasizes, that cyber defence is part of NATO’s core task of collective defence. A decision as to when a cyber attack would lead to the invocation of Article 5 would be taken by the North Atlantic Council on a case-by-case basis. Cooperation with NATO already contributes to the implementation of national security and defense in state policy. At the same time, taking into account that all decision-making in NATO based on consensus, Ukraine’s membership in the Alliance quite vague perspective. In such circumstances, in Ukraine you often can hear the idea of announcement of a neutral status. It is worth reminding that non-aligned status did not save Ukraine from Russian aggression. Neutral status will not accomplish it either. All talks about neutrality and the impossibility of Ukraine joining NATO are nothing but manipulations, as well as recognition of the Ukrainian territory as Russian Federation area of influence (this country seeks to sabotage the Euro-Atlantic movement of Ukraine). Think about it, Moldova’s Neutrality is enshrined in the country’s Constitution since 1994. However, this did not help Moldova to restore its territorial integrity and to force Russia to withdraw its troops and armaments from Transnistria.

Analysis of the ways of improvement of Ukraine – NATO cooperation on cybersecurity issues

2020 ◽  
Vol 10 (2) ◽  
pp. 11-15
Author(s):  
Volodymyr Shypovskyi ◽  
Volodymyr Cherneha ◽  
Serhiy Marchenkov
Keyword(s):  
Political Parties ◽  
North Atlantic ◽  
Lessons Learned ◽  
Cyber Warfare ◽  
The North ◽  
Collective Defense ◽  
Cyber Space ◽  
The Russian Federation ◽  
Modern Warfare ◽  
E Mail

Recent events in Ukraine have shown that, along with the advancement of information technology, methods of conducting modern warfare are being enhanced. Cyberspace is deliberately used by the Russian Federation to commit cyber warfare against Ukraine. Therefore, in order to address their influence effectively, it is important not only successfully deal with its consequences but also to foresee the potential adversaryʼs actions by analyzing their previous operations and incorporating the lessons learned by other countries. Across the globe, including Ukraine, the issue of information security and cyberattacks has become exceedingly urgent. Everybody is aware of the ongoing attacks on information networks of various government agencies and energy firms, cyberattacks on e-mail networks of political parties and organizations around the world. Likewise, despite the steadily growing numbers, cyberattack cases against the individuals and private businesses are not reported as widely as they occur. As a result, The North Atlantic Alliance countries began tackling the issue of cyberthreats much earlier than Ukraine. Consequently, NATO and its allies rely on powerful and robust cyber defenses to ensure the Alliance's core tasks of collective defense. The article discusses methods and strategies for providing cyber defense in NATO member states and recommends ways to increase the level of protection in the state's cyber space, as part of Ukraineʼs national security and defense domain.

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