El sentido del humor de Anacreonte y la lengua griega

On the basis of an analysis of the relevant terminology and “topoi”, passages of Anacreon which certain critics have misunderstood are explained.Con un análisis del léxico y de los tópicos correspondientes se explican varios pasajes de Anacreonte que algunos estudiosos no han sabido interpretar acertadamente

Dioscórides, Sófocles y la púrpura: un problema literario

Sófocles no ha vestido a los sátiros en sus dramas satíricos con los mantos purpúreos que llevan los personajes de la tragedia griega. La persona que habla en AP 7.37 es Dioniso (Bacchus).Sophocles did not clothe the Satyrs in his satyr-plays with the purple vestments peculiar to tragic actors. The speaker in AP 7.37 is Dionysus (Bacchus)

Poor written and oral text comprehension in third grade children. A multiple case study

In this multiple case study we analyzed oral text comprehension, reading profiles and underlying cognitive abilities (attention, executive functions, working memory, narrative memory, rapid automatized naming and vocabulary) of 9 children identified as poor written text comprehenders after a school screening on 75 third grade children. Four out of the 9 children were named Language-Minority (L-M) children, since they had immigrant parents. The remaining 5 children were born in Italy from Italian parents. The comparisons of the two subgroups suggested that the lexical route of reading was particularly impaired in the L-M subgroup and that written text comprehension was weakened by restricted vocabulary which, in turn, was not supported by efficient phonological short-term memory. In a second type of data analysis we examined the individual profiles of the 9 children, irrespective of their belonging to the L-M or Italian subgroups, and identified different patterns of associations among reading performance, written text comprehension and oral text comprehension. The findings showed that poor text comprehension always co-occurred with word and/or text reading difficulties which, in turn, were associated to slow naming and weak verbal working memory. Moreover, when children had both written and oral text comprehension difficulties, not only verbal working memory was impaired but also narrative memory, suggesting a weakness in the episodic buffer (Baddeley 2000; 2010). The implications of poor working memory associated to slow naming and/or weak episodic buffer for text comprehension are discusse

Sensorless position control of permanent magnet motors with pulsating current injection and compensation of motor end-effects

The sensorless position control of permanent-magnet motors is successfully implemented by superimposing a high-frequency voltage signal on the voltage reference or adding a high-frequency current signal to the current reference. The former approach is usually preferred because of its simplicity, although the latter one may allow better performance. This paper presents a new algorithm for the sensorless control of low-saliency permanent-magnet synchronous motors based on high-frequency sinusoidal current signal injection into the d-axis. Different from the related literature, the position information is derived by analyzing the measured high-frequency currents. The amplitude of the d-axis voltage reference is also exploited to improve performance. A proportional-integral (PI) controller plus a resonant term (PI-RES) is adopted to ensure the accurate tracking of both the dc and high-frequency components of the d-axis current reference. The main advantages of the proposed approach are the increased accuracy and sensitivity with respect to the approach based on voltage injection, the insensitiveness to inverter non-linearities that are compensated by the current regulation loop, the actual control on the injected current value, and the practical absence of acoustic noise. Experiments on a linear tubular permanent-magnet synchronous motor prototype have been carried out to verify the aforementioned advantages. This paper also presents a discussion of the parameters of the PI-RES

Una poesía de Íbico (fr. 2 Smyth = 287 Page-Davies)

El texto del fr. 2 Smith de Íbico está sano.The text of Ibycus fr. 2 Smyth is sound

On the text and the language of Euripides

Se demuestra que varios pasajes de Eurípides, tenidos por corruptos por los críticos, están sanos.Several passages of Euripides which were believed by the critics to be corrupt are shown to be sound

Il metodo storico nella critica testuale

Se ofrecen ejemplos de cómo es posible explicar por medio de un enfoque histórico pasajes controvertidos de autores griegos y latinos.Passages of Greek and Latin authors which many a critic cannot understand can often be explained by placing them in the proper historical perspective

Poetic programmes in the Orphic "corpus"

Un análisis histórico-literario, practicado dentro del marco del género épico, permite identificar los tópicos que los autores de las "Líticas" y las "Argonáuticas Orficas" utilizaron en la composición de sus respectivos programas poéticos

End effects in linear tubular motors and compensated position sensorless control based on pulsating voltage injection

The sensorless position control of permanent-magnet (PM) synchronous motors can be successfully implemented by superimposing a high-frequency voltage signal on the control voltage. In this paper, the position estimation is obtained by means of a high-frequency sinusoidal voltage signal injected along the estimated d-axis. Several methods proposed in the literature obtain the position estimation by tracking the zero condition of the high-frequency q current component. We propose a new approach that also exploits the d-axis high-frequency current component and allows working with injected voltage signal of reduced amplitude, thus reducing noise and additional losses. The main contribution of this paper relies in the compensation of the motor end effects due to the finite length of the tubular motor armature. These effects must be taken into account in the motor modeling because they cause an error in the position estimation that varies with the motor position. The modeling of the phenomenon and a proper compensation technique are proposed in this paper. Last, a simplified integral-type controller is used to estimate motor position instead of the commonly adopted proportional-integral controller plus integrator, and this requires a low-effort design. Experiments on a linear tubular PM synchronous-motor prototype are presented to validate the theoretical analysis and evidence the feasibility of the proposed sensorless technique

Lifetime consumption and degradation analysis of the winding insulation of electrical machines

In this paper, a novel multi-stress model which estimates the lifetime of the winding insulation relative to its duty cycle is proposed and investigated. With an adequate implementation of this model, then an electrical machine can be designed not only in terms of its performance requirements, but also considering the associated reliability and lifetime aspects. Since thermal and thermo-mechanical stresses are considered as the main ageing factors, the model is particularly suited for low voltage, low duty cycle machines. The determination of the model parameters is based on the results of accelerated thermo-mechanical ageing tests, whose procedure is thoroughly reported in the paper. The results of the accelerated ageing tests show that the effect of thermo-mechanical ageing is significant even for small size, random wound windings under fast temperature rise