Metal-as-Insulation HTS coils

Author(s):  
Thibault Lécrevisse ◽  
Xavier Chaud ◽  
Philippe Fazilleau ◽  
Clément Genot ◽  
Jung-bin Song

Abstract In this article, we summarize what we have learned about Metal-as-Insulation (MI) winding behavior and technical challenges. Bailey et al. first proposed the use of Metallic Insulation (MI) for superconducting magnet in 1988 through a U.S. patent. High Temperature Superconductor (HTS) materials are highly thermally stable. This feature compared to classical Low Temperature Superconductor (LTS) enables the use of MI technology to improve the protection against quenches. Gupta was the first to propose the use of a metallic tape in an HTS winding to avoid too much radial currents in No Insulation (NI) in 2011. Hahn et al. presented preliminary results on a pancake sample the same year. We are proposing here to come back on the work done for about 10 years by research groups worldwide and will focus on the turn-to-turn contact resistivity Rct parameter. We will also give details of our LNCMI-CEA-Néel Institute MI HTS insert built in 2018 in the framework of the French National Research Agency (ANR) funding through the NOUGAT project. We tested this magnet many times between 2018 and 2021 and learnt a lot on this technology. This magnet is the first REBCO solenoid of this size using this technology and tested intensively at such high magnetic field (up to 32.5 T) so far. In this magnet, we firstly include a magnetic shielding technology consisting of REBCO NI turns inside the overbanding of each pancake. We give some details and effect of such technology inside an HTS MI insert in case of a fast discharge, a quench or an outsert failure. Finally, we discuss about the self-protection feature of MI coils and we propose a passive protection way for high Rct values.

Author(s):  
Benjamin R. Levy

After John Cage’s 1958 Darmstadt lectures, many European composers developed an interest in absurdity and artistic provocation. Although Ligeti’s fascination with Cage and his association with the Fluxus group was brief, the impact it had on his composition was palpable and lasting. A set of conceptual works, The Future of Music, Trois Bagatelles, and Poème symphonique for one hundred metronomes, fall clearly into the Fluxus model, even as the last has taken on a second life as a serious work. This spirit, however, can also be seen in the self-satire of Fragment and the drama and irony of Volumina, Aventures, and Nouvelles Aventures. The sketches for Aventures not only show the composer channeling this humor into a major work but also prove to be a fascinating repository of ideas that Ligeti would reuse in the years to come.


Derrida Today ◽  
2009 ◽  
Vol 2 (2) ◽  
pp. 260-270
Author(s):  
Francesco Vitale

The paper aims to present a reading of the question of Testimony rising in Derrida's later works (from Faith and Knowledge to Poetics and Politics of Witnessing): the experience of Testimony as the irreducible condition of the relation to the Other, of every possible link among living human singularities and, thus, of the thinking of a community to come. This thinking is able to divert the community from the economy grounding and structuring it within our political tradition governed by the metaphysics of presence, which demands the sacrifice of the Other in its multiple theoretical and practical forms. We intend to read this proposal and to point out its rich perspectives by bringing it into the articulation of an ethical-political archi-writing. So we suggest going back to Derrida's early analyses of phenomenology and to De la grammatologie in order to present a reading of archi-writing as the irreducible condition of the relation to otherness and, thus, of the experience through which a living human singularity constitutes itself, a singularity different from the one our tradition compels us to think of within the pattern of the absolute presence to the self, free from the relation to the other.


2007 ◽  
Vol 3 (4) ◽  
pp. 20 ◽  
Author(s):  
Dan Wang ◽  
Qian Zhang ◽  
Jiangchuan Liu

2017 ◽  
Vol 3 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Christopher Moore ◽  
Kim Barbour ◽  
Katja Lee

Before Facebook, Twitter, and most of the digital media platforms that now form routine parts of our online lives, Jay Bolter (2000) anticipated that online activities would reshape how we understand and produce identity: a ‘networked self’, he noted, ‘is displacing Cartesian printed self as a cultural paradigm’ (2000, p. 26). The twenty-first century has not only produced a proliferation and mass popularisation of platforms for the production of public digital identities, but also an explosion of scholarship investigating the relationship between such identities and technology. These approaches have mainly focussed on the relations between humans and their networks of other human connections, often neglecting the broader implications of what personas are and might be, and ignoring the rise of the non-human as part of social networks. In this introductory essay, we seek to both trace the work done so far to explore subjectivity and the public presentation of the self via networked technologies, and contribute to these expanding accounts by providing a brief overview of what we consider to be five important dimensions of an online persona. In the following, we identify and explicate the five dimensions of persona as public, mediatised, performative, collective and having intentional value and, while we acknowledge that these dimensions are not exhaustive or complete, they are certainly primary.


Author(s):  
Afnan Maatouk Al - Talhi

The current study aimed to develop a mobile application based on video modeling to improve and enhance self-protection skills for children with autism. Semi-experimental design of the two groups was adopted: the control, which received the self-protection skills in the traditional way, while these skills was provided to the experimental group through the application based on video modeling. The research sample was consisted of 16 students who met the criteria. The researcher was applied the self-protection skills scale on the sample. After the experiment was applied for five weeks, the data were analyzed statistically. The results showed the effectiveness of the application in the development of self-protection skills for autistic children. The researcher recommended the use of the preferences of children with autism and the use of applications that based on video modeling in their education.


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