Fabrication and transport critical currents of multifilamentary MgB2/Fe wires and tapes

Multifilamentary MgB2/Fe wires and tapes with high transport critical current densities have been fabricated using a straightforward powder-in-tube (PIT) process. After annealing, we measured transport jc values up to 1.1 * 105 A/cm2 at 4.2 K and in a field of 2 T in a MgB2/Fe square wire with 7 filaments fabricated by two-axial rolling, and up to 5 * 104 A/cm2 at 4.2 K in 1 T in a MgB2/Fe tape with 7 filaments. For higher currents these multifilamentary wires and tapes quenched due to insufficient thermal stability of filaments. Both the processing routes and deformation methods were found to be important factors for fabricating multifilamentary MgB2 wires and tapes with high transport jc values.Comment: 13 pages, 7 figure

Substitution induced pinning in MgB_2 superconductor doped with SiC nano-particles

By doping MgB_2 superconductor with SiC nano-particles, we have successfully introduced pinning sites directly into the crystal lattice of MgB_2 grains (intra-grain pinning). It became possible due to the combination of counter-balanced Si and C co-substitution for B, leading to a large number of intra-granular dislocations and the dispersed nano-size impurities induced by the substitution. The magnetic field dependence of the critical current density was significantly improved in a wide temperature range, whereas the transition temperature in the sample MgB_2(SiC)_x having x = 0.34, the highest doping level prepared, dropped only by 2.6 K.Comment: 4 pages, 6 figure

Artificial intelligence in recruitment: just because it´s biased, does it mean it´s bad?

In recent years, artificial intelligence technologies have seen a major diffusion. Despite the numerous benefits, some concerns arise around the possibility that artificial intelligence may inherit human bias. This paper addresses to what extent artificialintelligence bias is a blocker to the implementation of those technologies in recruitment. The research was developed focusing on gender bias and data was gathered through a survey-based questionnaire. Data shows that recruiters consider artificial intelligence an opportunity to improve the recruitment process, however, bias does represent a disincentiveto the implementation of those technologies

A gastrointestinal stromal tumor (GIST) masquerading as an ovarian mass

BACKGROUND: Malignant gastrointestinal stromal tumors (GIST) are rare mesenchymal tumors originating in the wall of the gastrointestinal tract. Myogenic gastrointestinal stromal tumor, a distinctive morphologic variant is characterized by an unusually prominent myxoid stromal background. CASE PRESENTATION: We report a case of myxoid variant of GIST in a 42 years old woman presenting as an epigastric mass associated to an ovarian cyst and elevated CA-125. Histologically, the lesions was composed of a proliferation of spindle cells in an abundant myxoid stroma, without evidence of atypia or anaplasia. Immunohistochemical stains showed strong positive staining with muscle actin, positive staining with CD34 and weak positive staining with CD117, while showed negative for S-100. CONCLUSION: At surgery every effort should be made to identify the origin of the tumor. A complete surgical removal of the tumor should be obtained, as this is the only established treatment that offers long term survival

Une nouvelle bataille de vérité

Le droit d’asile connaît des transformations profondes depuis quelques années, en raison de phénomènes migratoires différents mais surtout parce qu’il est de plus en plus difficile d’entrer en Europe autrement qu’en tant que « demandeur d’asile ». L’article analyse les formes de soupçons que peuvent susciter auprès des commissions territoriales pour la protection internationale certains demandeurs d’asile originaires de l’Afrique subsaharienne lorsque leurs récits évoquent, en termes souvent oniriques, des menaces d’ordre spirituel, des actes de sorcellerie, ou lorsqu’ils exhibent des cicatrices rituelles en tant que « preuves ». Avec en toile de fond des tactiques narratives parfois nourries d’histoires préfabriquées dans l’espoir de les rendre plus plausibles, l’analyse suggère de voir dans ces thèmes l’expression d’un véritable « duel épistémologique » ou mieux, d’un retour de « la culture » et des « savoirs assujettis » sur la scène des droits humains, en mesure de faire vaciller les certitudes de l’État moderne.Asylum policies have undergone a profound change in recent years, caused by alterations in the characteristics of the migratory processes, but above all by the greater difficulty of entering Europe other than as an “asylum seeker.” This article examines the growing suspicions regarding asylum seekers’ narratives and experiences, especially when, as in the case of those from sub-Saharan Africa, their accounts speak—often in a dream-like language—of spiritual threats, mysterious deaths and acts of witchcraft, or they display ritual scars as “proof.” Against a background of narrative tactics that are fed by pre-fabricated stories that are better able to adhere to the criteria of credibility that it is supposed they should respect, the analysis suggests that the presence of these themes can be interpreted as expressing an authentic epistemological duel, or rather, a return of “culture” and “subjugated knowledge” on the human rights scene where this duel or return is unhinging the certainties of the modern state