952 resultados para Filosofía griega s.IV a.C.


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Fil: Chazarreta, Daniela Evangelina. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Fil: Chazarreta, Daniela Evangelina. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Fil: Chazarreta, Daniela Evangelina. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Many works deal with the study of Greek epigrams. These texts gather precious historical, religious and epigraphic content whose analysis has been addressed from a literary point of view. The degree of dependence of Hellenistic epigrams of earlier period epigrams are of great interest, as shown by recent and numerous papers on this matter (Harder et al . 1998; 2002; 2006; 2012; Bing and Bruss 2007; Baumbach et al. 2010). Another major line of research is focused on the origin of epigrams and their relation to elegy (Gentilli 1968; Passa 1998b) or to hexametric poetry and the oral-formulaic language inherited from Homeric tradition (di Tillio 1969; Moranti 1971, 1972; Gentili and Giannini 1977). Furthermore, other authors, such as Day (2010), have pointed out the significance of the performative and ritual nature of epigrams. Likewise, this field of study has undergone a renewal because of new papyrological findings enriching the existing epigram collection corpora. Compared to all these works, monographs and studies dedicated to the analysis of the language of the verse inscriptions are fewer. Many of them explore the linguistic differences between literary epigrams and those epigrams preserved by epigraphic means, as well as the degree of intervention of later tradition on such texts (Tiberi 1996, del Barrio Vega 2008; Kaczko 2009). The first exclusively linguistic reviews were published by the end of the 19th century (Wagner 1883; Fengler 1892), however, they are descriptive analyses lacking from an independent methodology. Kock(1910) was the first researcher who systematized and suggested a linguistic hypothesis and upheld the use of epichoric dialects by poets. His theory was supported by adepts such as Kretschmer (1913; 1915) although some discordant voices appeared soon, such as Buck (1923) who denied the existence of a linguistic standard and endorsed the importance of the Ionic model over the epichoric one. Traditionally, Greek language manuals point out the significance of the Ionic model and accept the adaptation of Homeric language to epichoric dialect. The study of verse inscription language was not systematically resumed until Mickey's publications (1981a; 1981b). According to this researcher, epigraphic poetry consists of a tempered version of the epichoric dialect where the dialect-characteristic features are avoided. Following the same line but with some differences, Alonso Déniz and Nieto Izquierdo (2009) conclude that the most distinctive features of Argolic are not avoided, at least at the metrical inscriptions from Argolid...

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Apresenta uma abordagem comparativa entre a contribuição sindical e a contribuição confederativa, apresentando as discussões doutrinárias e jurídicas sobre a questão de sua exigibilidade por parte de toda a categoria ou, tão-somente, dos filiados ao sindicato da respectiva classe econômica ou profissional.

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We report calculations for energy levels, radiative rates and electron impact excitation rates for transitions in He-like Li II, Be III, B IV and C V. grasp (general-purpose relativistic atomic structure package) is adopted for calculating energy levels and radiative rates. For determining the collision strengths and subsequently the excitation rates, the Dirac atomic R-matrix code (darc) is used. Oscillator strengths, radiative rates and line strengths are reported for all E1, E2, M1 and M2 transitions among the lowest 49 levels of each ion. Collision strengths have been averaged over a Maxwellian velocity distribution and the effective collision strengths so obtained are reported over a wide temperature range up to 10(6) K. Comparisons have been made with similar data obtained from the flexible atomic code (FAC) to highlight the importance of resonances, included in calculations from darc, in the determination of effective collision strengths. Discrepancies between the collision strengths from darc and fac, particularly for weak transitions and at low energies, have also been discussed. Additionally, lifetimes are also listed for all calculated levels of the above four ions.

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The main populating and depopulating mechanisms of the excited energy levels of ions in plasmas with densities <1023-1024 m-3 are electron collisional excitation from the ion's ground state and radiative decay, respectively, with the majority of the electron population being in the ground state of the ionization stage. Electron collisional ionization is predominately expected to take place from one ground state to that of the next higher ionization stage. However, the question arises as to whether, in some cases, ionization can also affect the excited level populations. This would apply particularly to those cases involving transient events such as impurity influxes in a laboratory plasma. An analysis of the importance of ionization in populating the excited levels of ions in plasmas typical of those found in the edge of tokamaks is undertaken for the C IV and C V ionization stages. The emphasis is on those energy levels giving rise to transitions of most use for diagnostic purposes (n ≤ 5). Carbon is chosen since it is an important contaminant of JET plasmas; it was the dominant low Z impurity before the installation of the ITER-like wall and is still present in the plasma after its installation. Direct electron collisional ionization both from and to excited levels is considered. Distorted-wave flexible atomic code calculations are performed to generate the required ionization cross sections, due to a lack of atomic data in the literature. Employing these data, ionization from excited level populations is not found to be significant in comparison with radiative decay. However, for some energy levels, ionization terminating in the excited level has an effect in the steady-state of the order of the measurement errors (±10%). During transient events, ionization to excited levels will be of more importance and must be taken into account in the calculation of excited level populations. More accurate atomic data, including possible resonance contributions to the cross sections, would tend to increase further the importance of these effects. 

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Resumen tomado de la publicación. Los alumnos de E. Primaria deben hacer las actividades en rojo y los alumnos de E. Secundaria las actividades en rojo y azul

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)