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- Rethinking the geopolitical shifts and security in the New MillenniumPublication . Matos, André; Garrido, RuiThis editorial introduces the Special Issue "Geopolitics and International Security in the 21st Century" and frames it against the erosion of the post–Cold War assumptions that once sustained optimism about global governance. It argues that two pillars of the 1990s (the expectation that democratisation would reduce conflict and the belief that deepening economic interdependence would pacify international relations) have been increasingly undermined by renewed geopolitical rivalry, an accelerating wave of autocratisation, and the strategic instrumentalisation of rules and institutions. The editorial further highlights how selective moral and political prioritisation of human life and dignity across contemporary crises has intensified pressures on international normative systems, weakened legitimacy, and contributed to patterns of diplomatic non-alignment, consequently amplifying global fragmentation. Against this background, the Special Issue’s contributions collectively address an overarching question: how can law and institutions remain credible and effective in a security environment shaped by resource competition, technological militarisation, disinformation, populist foreign policy, contested borders, and renewed debates on accountability for aggression and wartime harms? The editorial closes by stressing the need to restore principled coherence, human security, and trust in multilateral cooperation as prerequisites for confronting the systemic risks that threaten global stability and planetary survival.
- Clinical prediction and spatial statistical analysis of ascending thoracic aortic aneurysm structurePublication . Rodriguez, Katalina; Carvalho, Alda; Valente, Rodrigo; Xavier, José; Tomás, AntónioThis study presents an analysis of data from patients with ascending thoracic aortic aneurysms (ATAAs). Two databases of 87 patients were available: one containing clinical variables and the other consisting of measurements of the maximum diameter taken along the ascending aorta. For the clinical database, both a supervised and an unsupervised learning method were applied to explore patterns within the data. On the other hand, for the ascending aorta dataset, experimental variograms were calculated, from which key parameters of interest were extracted. These parameters were then analyzed over time to assess temporal patterns. This analysis aimed to assess the emergence of similar patterns or behaviour in patients with aneurysms of comparable sizes. Based on the analyses conducted, the clinical variables with the greatest importance in surgical decision-making were identified, while the spatial statistical analysis revealed patterns that may be related to elasticity, stiffness, or deformations of the aorta