1,354,590 research outputs found
Design of masonry infill walls with sliding joints for earthquake structural damage control
No full textMasonry-infilled RC frames can sustain significant damage in the event of strong ground shak-ing. The introduction of sliding joints in masonry infills can reduce the infill-frame interaction, ensure the in-fill out-of-plane stability, and minimize the infill damage under both in- and out-of-plane loading as shown by previous experimental and analytical studies. This paper summarizes previous studies and provides recom-mendations for the design and detailing of such structures. The proposed simplified design procedure can quantify the shear action on the frame columns due to the infill interaction which is compared to the case of traditional continuous infills
Industrialisation of Additive Manufacturing ¿ A Holistic approach: From design to production
No full textL'abstract è presente nell'allegato / the abstract is in the attachmen
The Slavic Homer: From Grigorios Stavridis to Grigor Prličev
No full textIn 1860 Stavridis/Prličev’s poem Armatol unexpectedly won him the University of Athens poetry competition, which met with opposition from part of the Greek community and a smear campaign in the press. Despite his declarations of having a “Hellenic heart”, the author from Ohrid was not well received by Athenian society. He took part in the competition once more two years later, this time trying to match Homer himself and presenting an extensive though unfinished epic poem with Gjergj Kastrioti Skanderbeg as the protagonist. The paper, which serves as an introduction to the Polish translation of Skanderbeg, contains extensive excerpts from the reports of both competition committees, chaired by Alexandros Rangavis, especially the second one, when the judges justified why they could not award Stavridis the prize despite being impressed with his poem. His disappointment at his cool reception and his failure in the competition most likely contributed to a radical change in the attitude of the Slavic Homer, who not only stopped “serving Greece” but began vigorously eliminating any Greek influences in his native Ohrid
Gravitational Waves from Rotating Proto-Neutron Stars
No full textWe study the effects of rotation on the quasi-normal modes (QNMs) of a newly born proto-neutron star (PNS) at different evolutionary stages, until it becomes a cold neutron star (NS). We use the Cowling approximation, neglecting spacetime perturbations, and consider different models of evolving PNS. The frequencies of the modes of a PNS are considerably lower than those of a cold NS, and are further lowered by rotation; consequently, if QNMs were excited in a sufficiently energetic process, they would radiate waves that could be more easily detectable by resonant-mass and interferometric detectors than those emitted by a cold NS. We find that for high rotation rates, some of the g-modes become unstable via the CFS instability; however, this instability is likely to be suppressed by competing mechanisms before emitting a significant amount of gravitational waves
The European Parliament as an International Parliamentary Institution (IPI)
No full textInterest in the role of International Parliamentary Institutions (IPIs) remains extremely limited, especially if one considers their growing numbers, functions, and importance in the international relations of a globalizing world. This article aims at contextualizing the European Parliament (EP)’s international role according to the IPIs literature, by asking whether the EP can be included in comparative studies on IPIs or, on the contrary, if it should rather be considered a ‘sui generis’ phenomenon – because of its role in European Union (EU) integration and the scope of its powers. Our argument is that the EP can (and should) be included in comparative studies on IPIs, at least for two different reasons: (i) by exploring conditions under which IPIs are established and empowered; (ii) by analysing the EP’s external relations. As a result, both the literature on IPIs and that on the external dimension of the EP will be enriched and allow for more, including synergetic, work in areas where there still is a clear academic gap. Accordingly, there will be three different sections. The first section will offer the background empirical description of what IPIs are, what their historical evolution has been, as well what are the more relevant definitions and categorizations offered by the literature to date. In the following section, the main argument will be developed, through the operationalization of IPIs’ different powers. After a brief presentation of the specific tools that the EP has been developing over the years in its external relations, the third section will focus on its inter-parliamentary assemblies. Finally, the conclusions will sum up some general findings, as well as identify a number of possible avenues for future research on the role of IPIs in world affairs
Partnership for the Americas: Western Hemisphere Strategy and U.S. Southern Command
No full textSince its creation in 1963, United States Southern Command has been led by 30 senior officers representing all four of the armed forces. None has undertaken his leadership responsibilities with the cultural sensitivity and creativity demonstrated by Admiral Jim Stavridis during his tenure in command.
Breaking with tradition, Admiral Stavridis discarded the customary military model as he organized the Southern Command Headquarters. In its place he created an organization designed not to subdue adversaries, but instead to build durable and enduring partnerships with friends. His observation that it is the business of Southern Command to launch “ideas not missiles” into the command’s area of responsibility gained strategic resonance throughout the Caribbean and Central and South America, and at the highest levels in Washington, DC.
Pursuing his vision for the Americas with limited resources, Admiral Stavridis made the most of every ship, airplane, Soldier, Sailor, Airman, Marine, and Coastguardsman committed to the region, employing each on constructive missions designed to create goodwill and mutual respect.
Perhaps Jim Stavridis’ most enduring contribution to Southern Command is the newly constructed headquarters complex in Miami. The new building, which finally creates a permanent lodgment for the command in the city that the Admiral correctly describes as the “Gateway to the Americas,” is a testimonial to his persistence, persuasiveness, and credibility within the Department of Defense and the U. S. Congress. More than a building, the new headquarters is tacit recognition of the importance of the command and acknowledgment that Miami is the single right location for the institution that, as much or more than any other, expresses our commitment to peace and stability in this hemisphere.
Admirals and Generals leave their marks on the organizations they command in different ways. Some solve the problems of the day; others set courses that will influence events and relationships for decades. Clearly, Admiral Stavridis is in the latter category. He has set wheels in motion that will transform our American culture to a culture of the Americas. xii PARTNERSHIP FOR THE AMERICAS
This thoughtful book should be required reading for those who recognize that the security of the United States, and indeed our destiny, are inextricably intertwined with those of our neighbors to the south.
General Charles E. Wilhelm United States Marine Corps (Retired)https://digitalcommons.ndu.edu/ndupress-books/1002/thumbnail.jp
Stavridis, Arquilla Discuss Technology Disruption, Geopolitics, Leadership During NPS' Latest Virtual SGL
No full textNews Stories ArchiveRetired Navy Adm. James Stavridis spoke virtually to Naval Postgraduate School (NPS) students, faculty and staff about technological warfare, the effects of a changing geopolitical environment, and ho... Read Mor
Le poème épique «Scanderbeg» de Grégoire Stavridis (Prlicev) d’Ohrid
No full textNo abstractDans cette étude l’auteur traite le problème des sources historiques et littéraires du poème épique «Scanderbeg», composé par Grégoire Stavridis (Prlicev), poète originaire de la ville d’Ohrid. Ce poème, soumis en 1862 à un concours poétique à Athènes, restait inédit jusqu’ au jour où, suivi d’une traduction bulgare en prose, fut publié par H. Kodov d’après un manuscrit trouvé dans une bibliothèque de Bulgarie (édition de l’Académie des Sciences de Sofia, 1962, 19692). Les philologues bulgares ont considéré le poème en question comme appartenant à la littérature bulgare, tandis que pour les chercheurs de l’université de Skopje celui-ci doit faire partie de la production littéraire de la langue de leur république autonome. Cependant ancune recherche efficace n’a pas eu lieu jusqu’ à présent dans le but de préciser de manière convaincante les sources et mettre en évidence la structure profonde de cet œuvre poétique. Le résultat d’un travail de ce genre aurait en plus déterminé croit-on, la valeur littéraire du poème. L’auteur de cette étude croit avoir prouvé que Stavridis a puisé ses ren seignements sur la vie et l’activité de Scanderbeg dans «l’Histoire de Georges Kastriotis» publiée à Athènes par A. Papadopoulos - Vretos en 1848, c’est- à-dire une année avant l’arrivée du poète en Grèce, tandis que, quant à la langue et le style de son poème il a imité 1’ Iliade de Homère. En effet, Stavridis, a emprunté aux èpos homériques des formes grammaticales, des mots, des phrases entières et en a imité même le style de sorte que son «Scander beg» se présente comme une imitation du texte d'Homère. L’épos «Scanderbeg», composé à une époque où son auteur soutenait dans ses écrits son origine grecque, porte l’empreinte du style grec et de la culture grecque de celui-ci. Il doit par conséquent être considéré comme faisant partie de la production littéraire grecque de son époqu
Rotational effects on the oscillation frequencies of newly born proto-neutron stars
No full textIn this paper we study the effects of rotation on the frequencies of the quasi-normal modes of a proto-neutron star (PNS) born in a gravitational collapse during the first minute of life. Our analysis starts a few tenths of a second after the PNS formation, when the stellar evolution can be described by a sequence of equilibrium configurations. We use the evolutionary models which describe how a non-rotating star cools down and contracts while neutrino diffusion and thermalization processes dominate the stellar dynamics. For assigned values of the evolution time, we set the star into slow rotation and integrate the equations of stellar perturbations in the Cowling approximation, both in the time domain and in the frequency domain, to find the quasi-normal mode frequencies. We study the secular instability of the g modes, which are present in the oscillation spectrum due to the intense entropy and composition gradients that develop in the stellar interior, and we provide an estimate of the growth time of the unstable modes based on a post-Newtonian formula
Pick-and-place in dynamic environments with a mobile dual-arm robot equipped with distributed distance sensors
No full textMobile bimanual manipulation in a dynamic and uncertain environment requires the continuous and fast adjustment of the robot motion for the satisfaction of the constraints imposed by the task, the robot itself and the environment. We formulate the pick-and-place task as a sequence of mobile manipulation tasks with a combination of relative, global and local targets. Distributed distance sensors on the robot are utilized to sense the surroundings and facilitate collision avoidance with dynamic and static obstacles. We propose an approach to kinematically control the robot by solving a priority constrained optimization problem online. Experimental results on the YuMi bimanual robot mounted on the Ridgeback mobile platform validate the performance of the proposed approach
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