Shields

About: Shields is a research topic. Over the lifetime, 1456 publications have been published within this topic receiving 10896 citations.

Dual spin valve CPP MR with flux guide between free layers thereof

Abstract: A current perpendicular-to-the-plane magnetoresistance (CPP-MR) device includes a first magnetic shield, a second magnetic shield, and a spin valve structure. The first and second magnetic shields are formed of an electrically conductive and magnetically shielding material. A read gap is defined between the first and second magnetic shields, and the spin valve structure is disposed between the first and second magnetic shields. The spin valve structure is electrically connected and magnetically separated from the first and second magnetic shields such that the first and second magnetic shields act as electrical contact leads.

Application of superconducting shields in current-limiting and special-purpose transformers

Abstract: The principles of operation and the design of power transformers based on superconducting shields have been considered. The laboratory prototypes of fault current-limiting and special-purpose (arc welding/furnace) transformers have been tested. The application of both low-T/sub c/ and high-T/sub c/ superconducting shields has been studied. >

The Shields of Phoenissae

Abstract: T HE SHIELDS of the Argive attackers in Euripides' Phoenissae occupy some thirty lines (1104-40)1 at the beginning of the Messenger's speech describing the first inconclusive battle. Despite convincing attempts to meet the difficulties presented by these lines, wholesale excision has often been proposed as a solution.2 These difficulties arise not only from the apparently meaningless symbols described on the shields, but also from the problematic relationship of the scene itself to the comparable passage in Seven Against Thebes, a relationship that the Euripidean lines seem deliberately to obscure and contradict. In this paper I want to investigate some of the crucial ways in which the scene measures its distance from the 'original' Aeschylean text of the Seven, and to suggest that the Euripidean passage can be read as the locus of an emphatic and self-aware intertextuality, in that its relation to another text or texts is part of what it thus advertises as its meaning and as the method of deciphering it. I shall proceed to offer interpretations of the individual shields, arguing that they signify in relation not only to their Aeschylean precedents but also to the central concerns of the present play. In contrast to the passage in the Seven, the Euripidean account is much reduced and impoverished; by no stretch of the imagination does it constitute the centre of the play, as do the Aeschylean shields. It is true that some sort of shield scene appears to be anticipated in several strategic references made to shields (120, 142,251,576,796, 1073), and more precisely by the teichoskopia and Eteocles' dismissive comment to Creon (751f: lJvofLa 0' (Kcl.O\"TOV o,aTp,{3~ 7TOAA~ A€Y£LV EX8pWV 1m' aVTo,!> TEtx£O\"LV Ka81JfL€VooV). But the scene is just as repeatedly rendered impossible, or at least unlikely, by other moves in the play that pre-empt its power and significance (we know all along, for instance, that the brothers intend to kill each other). And the description of the shields is robbed of any possible charge of terror or urgency by its postponement until the battle is over and the defeat of

A Novel Configuration for Superconducting Space Radiation Shields

Abstract: Long-time exposure to galactic cosmic rays is one of the most problematic threats for a manned mission in the deep space. In the last decades, several studies of active superconducting magnetic shields were performed leading to the proposals of apparently promising magnetic configurations. However, as the interaction of energetic particles with the materials composing the magnets was not taken into account, the contribution of secondary particles to the astronauts’ radiation dose was neglected, and, consequently, the actual effectiveness of the shields was overestimated. In the frame of the EU-FP7-SR2S project, a study of superconducting space radiation shield was performed associating the optimization of the magnetic configuration with Monte–Carlo simulation of the dose reduction. It was found that most of the magnetic shields proposed in previous works are not adequate, and a novel configuration, transparent to radiation, was proposed based on toroids arranged with their axes perpendicular to the spacecraft axis. Compared to other shields with the same shielding power, such a configuration results in lower magnetic field at the superconductor and very light design.