En este artículo, su autor, el General Jefe del Mando Aéreo de Combate, nos expone, desde un punto de vista esencialmente operativo refrendado por sus últimas actuaciones en conflictos y otras misiones, las características y capacidades del Poder Aéreo.Se hacen unas reflexiones sobre las capacidades básicas que debe tener la Fuerza Aérea española para que tenga una dimensión operativa creíble, y que la hagan apta para afrontar con garantías de éxito los nuevos escenarios y retos del futuro, desde el terrorismo (...) hasta las operaciones de paz y humanitarias. Desmenuza las misiones que hoy desarrolla el Ejército del Aire, tanto a favor de la consecución de los objetivos de la Defensa Nacional, como en apoyo de la sociedad a la que sirve. Finalmente actualiza otros aspectos relevantes, entre los que destacan la colaboración con los Ejércitos de Tierra y Armada, la denominada. (shrink)

In this research, a sliding mode regulator with sine mapping is suggested for the stabilization of electricity generators being affected by magnet interaction nonlinearities and generator nonlinearities. To reach this goal, our suggested regulator has the following contributions: it starts from the sliding mode regulator with the modifications that the saturation mapping is used to reach a smoother performance instead of the signum mapping, and the sine mapping is applied to reach an upper bound in the proportional gain error, it (...) is used to reach some chosen constant behaviors for the angle position, angle speed, and current in the electricity generators, and its stabilization is ensured based on the Lyapunov approach. We show the simulation of the suggested regulator in two electricity generators. (shrink)

In this note, the problem of tracking random references and rejecting random perturbations in a quadrotor, both generated by an auxiliary system named exosystem, is solved by extending the deterministic tracking problem to the area of stochastic processes. Besides, it is considered that only a part of the state vector of the quadrotor is available through measurements. As a consequence, the state vector of the plant must be estimated in order to close the control loop. On this basis, a controller (...) to track random references and to reject random perturbations is developed by combining a Kalman filter to estimate the references and perturbations of an exosystem and an observer to estimate the states of a quadrotor. Besides, to obtain a more practical controller, the analysis is carried out in discrete time. Numerical simulations are used in a quadrotor to confirm the validity and effectiveness of the proposed control. (shrink)

The origins of teacher training programs in Chile have not been addressed in depth apart from Vivanco’s studies. Even though these studies explore the development of these programs in Chile from a chronological perspective, there are no qualitative studies that consider senior academics’ narrations. This qualitative study reconstructs the trajectory of teacher training programs in Chile from a series of interviews with 25 academics in charge of these programs. Results were analyzed in three different periods: 1960-1973, 1973-1990, and 1990 to (...) 2019. Results, discussed in a political and academic context, reveal that these teacher training programs have evolved in a sociopolitical context, generating a series of tensions that substantially impact these training programs. The study finishes with the statement of a series of questions aimed at reflecting upon the state of the art in Chile’s training programs. (shrink)

El text d’Ian Ground la traducció del qual transcrivim a continuació va ser llegit a l’acte de presentación del seu llibre ¿Arte o chorrada? (València, Publicacions de la Universitat de València / Col•lecció Estètica & Crítica, 2008) el dia 9 de juny de 2008 a l’Aula Magna de l’edifici del Carrer La Nau de la Universitat de València, amb la presència, a més d’Ian Ground, de Romà de la Calle (en qualitat de Director de la col•lecció Estètica & Crítica) i (...) de mi mateix, Salvador Rubio (en qualitat de traductor, editor i autor de la introducció del llibre). El text va ser llegit en anglés pel seu autor, alternat, paràgraf per paràgraf, amb la lectura de la traducció castellana. Hem preferit que el text traduit aparega ací en castellà, exactament igual al que va ser llegit a l’esmentat acte de presentació. La reflexió que ens proposa Ian Ground, en cara que específicament concebuda per a aquest acte, no necessita cap presentació i pot ser llegida perfectament com un text autònom. Tanmateix, em permet precedir-la amb unes quantes observacions que no pretenen sustituir les meues paraules a l’acte (on, naturalment, els agraïments eren els protagonistes) ni tampoc la introducció del llibre ja publicada, i a la qual es pot remetre directament el lector d’aquest article. (shrink)

The process of the mathematization of physical situations through differential calculus requires an understanding of the justification for and the meaning of the differential in the context of physics. In this work, four different conceptions about the differential in physics are identified and assessed according to their utility for the mathematization process. We also present an empirical study to probe the conceptions about the differential that are used by students in physics, as well students’ perceptions of how they are expected (...) to use differential calculus in physics. The results support the claim that students have a quasi-exclusive conception of the differential as an infinitesimal increment and that they perceive that their teachers only expect them to use differential calculus in an algorithmic way, without a sound understanding of what are they doing and why. These results are related to the lack of attention paid by conventional physics teaching to the mathematization process. Finally, some proposals for action are put forward. (shrink)

This essay traces the connected histories of Portuguese and French anthropology in the late nineteenth century. By looking at a Portuguese scientific institution, the Carlos Ribeiro Society, it considers how French race science, known as anthropologie, was adopted and adapted across the European Latin world as a type of “stranger-science.” That is: as an authoritative outsider scientific formation, installed into national terrain in accordance with insider strategies for turning foreign elements into native forms of scientific sovereignty and modernity. French anthropology’s (...) international diffusion becomes meaningful in the light of the Portuguese incorporating what was foreign and modern as a means to generate vitality, and authority endogenously in their own national context. Hence, addressing the circulation of stranger-sciences can pave the way for an original conceptualizing of the transnational life of race science across and even beyond the Latin world. (shrink)

This paper suggests the democratic direction in which the right of freedom of expression should be conceived and applied. In the first two sections it suggests some counter-examples to, and diagnoses of, the libertarian and liberal conceptions of freedom of expression, taking Scanlon (1972) and Scanlon (1979), respectively, to be their chief proponents. The paper suggests that these conceptions cannot take into account clear examples, like fraudulent propaganda, which should not be legal. The democratic conception takes it to heart that (...) the pillars upon which the right of freedom of expression is founded are individual and collective autonomy, the right to know facts of public interest and information necessary for effective democratic control of government. The paper suggests that in a time when private powers seriously threaten these pillars, it is correct for the government to step in to provide the framework in which genuine discussion geared toward fulfilling the objectives of these pillars can take place. (shrink)

Recoge: Fe y cultura; El tomismo en la iglesia; Neotomismo y pensamiento socieconómico contemporáneo; Objetividad, neutralidad y normatividad de la ciencia económica.

Este trabajo de investigación documenta la relación de dos dramaturgos áureos: Francisco de Rojas Zorrilla y Jerónimo de Cáncer y Velasco.

Este trabajo pretende exponer la recepción del atomismo de Epicuro y la reinterpretación dialéctica de la teoría del clinamen en la tesis doctoral de 1841 de Karl Marx, con el propósito de extraer algunas aportaciones para una teoría de la libertad. Para ello se analizan las implicaciones del enfoque dialéctico marxiano aplicado a la declinación epicúrea a la luz de las aportaciones del pensamiento filosófico de Schiller y la fenomenología hermenéutica de Ricoeur. Marx descubre en Epicuro una “ciencia de la (...) atomística” en la cual el clinamen es la autodeterminación formal del átomo respecto de la materia; su ley interna, por medio de la cual se abre la posibilidad de una libertad humana que transgrede el determinismo. Se intenta mostrar que causalidad natural y libertad no son excluyentes en un materialismo idealista como el epicúreo, en el que, conforme a la interpretación de Marx, idea y materia se integran en una síntesis dialéctica. (shrink)

El presente trabajo examina la naturaleza de la realidad en el marco de la física moderna, incluyendo laposibilidad de la libertad. Adicionalmente, propone una reforma a la metafísica del realismo. Para el realismo,el mundo es como es, independiente de la mente. Sin embargo, la relatividad general supone que la velocidadde los objetos y el orden temporal de los eventos dependen del marco de referencia que se adopte. Qué marco de referencia se adopta responde a intereses humanos, pero sigue habiendo hechos (...) físicos independientes delmarco de referencia: la velocidad de la luz, la distancia espaciotemporal, la equivalencia entre energía y materia,entre otros. Por otro lado, la “interpretación de Copenhague” estima que los estados cuánticos están en una superposición que solo se concreta en el momento de observación: el “gato de Schrödinger” está vivo y muerto, hasta que lo observamos. Sin embargo, se analizan posibilidades realistas menos inverosímiles. La física moderna, determinista o indeterminista, también amenaza la posibilidad de que tengamos libertad. Se analiza y desarrollala compatibilidad de la libertad como autogobierno con la física moderna. A pesar de que aspectos centrales dela metafísica realista se conservan, se concluye con una concepción filosófica-científica del universo que integrea los seres mentales dentro del mismo, lo cual supone una reforma a la metafísica del realismo científico estándar. (shrink)

Inspired by the early Wittgenstein’s concept of nonsense (meaning that which lies beyond the limits of language), we define two different, yet complementary, types of nonsense: formal nonsense and pragmatic nonsense. The simpler notion of formal nonsense is initially defined within Tarski’s semantic theory of truth; the notion of pragmatic nonsense, by its turn, is formulated within the context of the theory of pragmatic truth, also known as quasi-truth, as formalized by da Costa and his collaborators. While an expression will (...) be considered formally nonsensical if the formal criteria required for the assignment of any truth-value (whether true, false, pragmatically true, or pragmatically false) to such sentence are not met, a (well-formed) formula will be considered pragmatically nonsensical if the pragmatic criteria (inscribed within the context of scientific practice) required for the assignment of any truth-value to such sentence are not met. Thus, in the context of the theory of pragmatic truth, any (well-formed) formula of a formal language interpreted on a simple pragmatic structure will be considered pragmatically nonsensical if the set of primary sentences of such structure is not well-built, that is, if it does not include the relevant observational data and/or theoretical results, or if it does include sentences that are inconsistent with such data. (shrink)

Uma das mais difusas dicotomias ainda presentes no discurso jurídico contemporâneo é a noção de Público e Privado. Essencial ao Liberalismo Clássico, essa dicotomia, revela agora sua crise. Esse artigo, em respeito às suas raízes existencialistas, posta suas lentes desconstrutoras nessas noções, para encontrar por trás delas o homem real (demasiadamente humano). PALAVRAS-CHAVE – Público. Privado. Discurso. Existencialismo. Pós-Modernidade. Humanismo. Arqueologia.

Sáo dois os propósitos deste artigo. Primeiro desejamos examinar porque o projeto de Carnap de construir uma lógica indutiva náo foi bem sucedido. De forma a realizar isso, nos apoiaremos na distinçáo entre o problema da justificaçáo da induçáo e o problema da descriçáo da induçáo. Tentaremos mostrar que a principal razáo pela qual o projeto de Carnap falhou foi sua relaçáo com o problema da justificaçáo da induçáo. Nosso segundo objetivo é propor algumas idéias de como seria um lógica (...) da induçáo que propositadamente evite o problema da justificaçáo e possa consequentemente ser chamada de uma lógica puramente descritiva da induçáo. Utilizaremos para isso um conceito de probabilidade presente no Logical Foudations of Probability de Carnap chamada por ele de probabilidade pragmática. (shrink)

O propósito desse artigo é fornecer um tratamento formal para um tipo de ação até o momento negligenciada nas lógicas modais filosóficas da ação: ação em plano. Ao fazer isso nós seguimos a abordagem padrão nas lógicas modais da ação exemplificados pelos trabalhos de Belnap, Chellas and Pörn. Como nós acreditamos que existe uma relação forte entre plano, tempo e indeterminismo, nós usamos a teoria do tempo ramificado para investigar as características básicas da ação em plano. Além de introduzir uma (...) semântica do tempo ramificado, nós também apresentamos um cálculo correto e completo com relação a essa semântica. DOI:10.5007/1808-1711.2010v14n3p421. (shrink)

The aim of this work is to discuss "Darwinism: its past, its present, its future", a lecture given in 1875 by Miranda Azevedo as one of the "Popular Lectures of the Gloria Neighborhood, Rio de Janeiro". In this lecture Azevedo elaborates the concepts of evolution, human evolution, progress and the idea of man as the pinnacle of evolution and the master of the selective laws governing nature. We will analyze the article, published in 1876, that contains the full text of (...) Azevedo's lecture. Of particular importance is his affiliation to Haeckel, something already commented on in Brazilian historiography. But, unlike other studies devoted to the theme, I will examine in detail Azevedo's text, attempting to show how he relates hereditary and selective evolutionary processes to thinking about how future Brazilian generations could progress. (shrink)

This paper examines physics and mathematics textbooks published in France at the end of the 1950s and at the beginning of the 1960s for children aged 11–15 years old. It argues that at this “middle school” level, textbooks contributed to shape cultural representations of both disciplines and their mutual boundaries through their contents and their material aspect. Further, this paper argues that far from presenting clearly delimited subjects, late 1950s textbooks offered possible connections between mathematics and physics. It highlights that (...) such connections depended upon the type of schools the textbooks aimed at, at a time when educational organization still differentiated pupils of this age. It thus stresses how the audience and its projected aptitudes and needs, as well as the cultural teaching traditions of the teachers in charge, were inseparable from the diverse conceptions of mathematics and physics and their relationships promoted through textbooks of the time. (shrink)

Resenha ao livro "Maquiavelianas: lições de política republicana", do professor Sérgio Cardoso (USP).

¿Ciencias sociales o ciencias de la sociedad? -- La adquisición e intercambio de conocimiento -- La formación y evolución del lenguaje -- La formación de valores, moral y costumbre -- Bases metodológicas para el estudio histórico de los fenómenos sociales -- Cooperación social y gobierno.

Es difícil imaginar una sociedad del buen vivir sin arte. Por ello, la creatividad artística es reconocida como derecho en la Constitución del Ecuador, y como derecho humano en los intrumentos internacionales relevantes. Partiendo de esta reflexión, los artículos de este libro argumentan que siendo el arte un derecho, le corresponde al Estado la provisión de condiciones para su garantía por medio de políticas públicas, que deben tomar en cuenta tanto las especificidades de las personas, y los pueblos y nacionalidades, (...) como el contexto tecnológico de la era digital, que brinda las bases para una sociedad abierta donde el conocimiento sea libre. (shrink)

Heidegger's philosophy between Being and Time and «The Origin of the Work of Art» shows a twofold consideration of production. On the one hand, Heidegger criticizes the ontological tradition for its orientation to the produced-being . On the other hand, he develops his own ontological conception of production. This paper focuses on the analysis of the latter consideration by showing its motivations, characteristics and scope. The main thesis is that the transition from Heideggerian Schematism to Heidegger's reflections on art is (...) a transition from a visual to a plastic conception of the production of pictures. (shrink)

Este artículo se propone evaluar las lecturas que afirman que la perspectiva decolonial, en su crítica a la modernidad y al eurocentrismo, pretende aferrarse a un particularismo propio de la diferencia cultural latinoamericana con el fin de recuperar los lazos comunitarios previos a la conquista, donde se encontrarían las claves de la liberación presente. Bajo esta perspectiva la teoría decolonial rechaza toda política institucional y aspira a afianzar comunidades oprimidas que se articulan en función de ejes de opresión como la (...) raza, la cultura, el género o la clase, abandonando así toda pretensión de universalidad por considerarla el rasgo fundamental de la modernidad europea y de la dominación colonial. De aquí dichas perspectivas concluyen que el pensamiento decolonial es incompatible con las luchas populares realizadas en clave universal y republicana. Frente a estas posiciones se buscará trazar los lineamientos de una política decolonial intercultural en clave analéctica y transmoderna que superen la falsa antinomia antes expuesta. Para tal fin se destacará la potencia política del locus de enunciación de la diferencia colonial como punto de partida para un proyecto de conformación de comunidades y coaliciones que buscan hacer frente a múltiples opresiones. (shrink)

El siguiente artículo se propone estudiar la poesía de Luis Hernández a partir de los problemas que surgen al intentar estudiar su obra reunida. Antes que ser valorada como una poesía “inacabada”, la deliberada asistematicidad de su poética debe ser entendida como el resultado de un calculado y consciente ejercicio artístico, cuyas fuentes filosóficas tradicionalmente han pugnado por una ontología del movimiento frente a una metafísica de la permanencia. Bajo esta perspectiva, la obra de Hernández se revela como un “plano (...) de inmanencia”, desde el cual acontece el sentido de su poesía en el quehacer de la escritura. (shrink)