592 research outputs found
Upper Bounds for the Euclidean Operator Radius and Applications
No full textThe main aim of the present paper is to establish various sharp
upper bounds for the Euclidean operator radius of an n−tuple of bounded
linear operators on a Hilbert space. The tools used are provided by several
generalisations of Bessel inequality due to Boas-Bellman, Bombieri and the
author. Natural applications for the norm and the numerical radius of bounded
linear operators on Hilbert spaces are also given
Coordinated hunting by Cuban boas
Get PDFCoordinated hunting, in which individual predators relate in time and space to each other’s actions, is uncommon in animals, and is often difficult to distinguish from simply hunting in non-coordinated groups, which is much more common. The author tested if Cuban boas (Chilabothrus angulifer) hunting bats in cave passages take into account other boas’ positions when choosing hunting sites, and whether their choices increase hunting efficiency. Snakes arriving to the hunting area were significantly more likely to position themselves in the part of the passage where other snakes were already present, forming a “fence” across the passage and thus more effectively blocking the flight path of the prey, significantly increasing hunting efficiency. This is the first study to test for coordination between hunting reptiles, rather than assume such coordination based on perceived complexity of hunting behavior
Educação e cultura no pensamento de Franz Boas
No full textThis article seeks to instigate a discussion of the issues Education and Culture, with the theoretical thinking of Franz Boas, especially the book The Mind of Primitive Man, in which the author deals with anthropological themes of great importance for the understanding of social reality. Anthropological themes as "race " and "culture" are medullary in anthropology from Boas and serve as a basis for studying the concept of education today and the educational process of all times and places.Este artigo busca instigar a discussão dos temas Educação e Cultura, tendo como referencial teórico o pensamento de Franz Boas, sobretudo a obra The mind of primitive man, na qual o autor trata de temas antropológicos de suma importância para a compreensão da realidade social. Temas antropológicos como “raça” e “cultura” são medulares na antropologia de Boas e servem como base para estudar o conceito de educação, hoje, e o processo educacional de todos os tempos e lugares
SERGIO VILAS-BOAS: um ícone enigmático do Jornalismo Literário brasileiro
Get PDFA multifaceted author, versatile, complex and enigmatic. It’s Vilas-Boas, who in 25 years of his career has consolidated a career that includes solid and reference works in all fields of Literary Journalism: he was / is a reporter, biographer, researcher, teacher, writer, novelist and much more. Both in the fictional novel and in the works of journalism, the creative capacity of Vilas-Boas is evident. And this creativity at various times leaves the pages of the books to be the north of his own life. After all, Vilas-Boas is in many ways exactly like his characters: a man who tries to find himself in an increasingly complex and chaotic world.Un autor multifacético, polivalente, complejo y enigmático. Este es Sergio Vilas-Boas, que en 25 años de carrera consolidó una trayectoria que incluye trabajos sólidos y de referencia en todos los campos del Periodismo Literario: fue / es reportero, biógrafo, investigador, profesor, escritor, novelista y mucho más. Tanto en la novela ficcional como en las obras de periodismo, la capacidad de creación de Vilas-Boas es evidente. Y esa creatividad en varios momentos deja las páginas de los libros para ser el norte de su propia vida. Al final, Vilas-Boas es en varios aspectos exactamente igual a sus personajes: un sujeto que intenta encontrarse en un mundo cada vez más complejo y caótico.Um autor multifacetado, polivalente, complexo e enigmático. Assim é Sergio Vilas-Boas, que em 25 anos de carreira consolidou uma trajetória que inclui trabalhos sólidos e de referência em todos os campos do Jornalismo Literário: foi/é repórter, biógrafo, pesquisador, professor, escritor, romancista e muito mais. Tanto no romance ficcional quanto nas obras de jornalismo, a capacidade de criação de Vilas-Boas é evidente. E essa criatividade em vários momentos deixa as páginas dos livros para ser o norte de sua própria vida. Afinal, Vilas-Boas é em vários aspectos exatamente igual aos seus personagens: um sujeito que tenta se encontrar em um mundo cada vez mais complexo e caótico.
PALAVRAS-CHAVE: Sergio Vilas-Boas; Jornalismo Literário; Biografia; Jornalismo; Literatura.
ABSTRACT
A multifaceted author, versatile, complex and enigmatic. It’s Vilas-Boas, who in 25 years of his career has consolidated a career that includes solid and reference works in all fields of Literary Journalism: he was / is a reporter, biographer, researcher, teacher, writer, novelist and much more. Both in the fictional novel and in the works of journalism, the creative capacity of Vilas-Boas is evident. And this creativity at various times leaves the pages of the books to be the north of his own life. After all, Vilas-Boas is in many ways exactly like his characters: a man who tries to find himself in an increasingly complex and chaotic world.
KEYWORDS: Sergio Vilas-Boas; Literary Journalism; Biography; Journalism; Literature.
RESUMEN
Un autor multifacético, polivalente, complejo y enigmático. Este es Sergio Vilas-Boas, que en 25 años de carrera consolidó una trayectoria que incluye trabajos sólidos y de referencia en todos los campos del Periodismo Literario: fue / es reportero, biógrafo, investigador, profesor, escritor, novelista y mucho más. Tanto en la novela ficcional como en las obras de periodismo, la capacidad de creación de Vilas-Boas es evidente. Y esa creatividad en varios momentos deja las páginas de los libros para ser el norte de su propia vida. Al final, Vilas-Boas es en varios aspectos exactamente igual a sus personajes: un sujeto que intenta encontrarse en un mundo cada vez más complejo y caótico.
PALABRAS CLAVE: Sergio Vilas-Boas; Periodismo Literario; Biografía; Periodismo; Literatura
India’s Limited Room for Maneuver: How New Delhi Addresses Its Strategic and Critical Vulnerabilities vis-à-vis China and Russia after the Galwan Clash and Russia’s Full-Scale Invasion of Ukraine
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