AdS5_5 vacua from type IIB supergravity on T1,1T^{1,1}

We study maximally supersymmetric Anti-de Sitter backgrounds in consistent N=2 truncations of type IIB supergravity compactified on the Sasaki-Einstein manifold $T^{1,1}$. In particular, we focus on truncations that contain fields coming from the nontrivial second and third cohomology forms on $T^{1,1}$. These give rise to N=2 supergravity coupled to two vector- and two hypermultiplets (Betti-vector truncation) or one vector- and three hypermultiplets (Betti-hyper truncation), respectively. We find that both truncations admit AdS$_5$ backgrounds with the gauge group always being broken but containing at least an $U(1)_R$ factor. Moreover, in both cases we show that the moduli space of AdS vacua is nontrivial and of maximal dimension. Finally, we explicitly compute the metrics on these moduli spaces.Comment: 20 pages; v2: updated references; v3: 21 pages, as published in JHE

Specific heat of aluminium-doped superconducting silicon carbide

The discoveries of superconductivity in heavily boron-doped diamond, silicon and silicon carbide renewed the interest in the ground states of charge-carrier doped wide-gap semiconductors. Recently, aluminium doping in silicon carbide successfully yielded a metallic phase from which at high aluminium concentrations superconductivity emerges. Here, we present a specific-heat study on superconducting aluminium-doped silicon carbide. We observe a clear jump anomaly at the superconducting transition temperature 1.5 K indicating that aluminium-doped silicon carbide is a bulk superconductor. An analysis of the jump anomaly suggests BCS-like phonon-mediated superconductivity in this system.Comment: 4 pages, 2 figure

Accumulation of radioisotopes with tumor affinity. I. Uptake and excretion of 67Ga-citrate in malignant tumors and normal cells

Using in vivo and in vitro experimental models, the uptake and excretion of 67Ga-citrate in tumor cells and normal cells were studied. The time-lapse accumulation of 67Ga in the tumor of rats bearing Yoshida sarcoma reached its peak 24 h after the administration of 67Ga and gradually decreased thereafter. However, the excretion of 67Ga from the tumor was less than that from normal lung. For culture cells in vitro, the uptake of 67Ga increased with lapse of contact time between 67Ga and the cells, but there was no distinct difference between the results of tumor cells and normal skin fibroblasts. The excretion of 67Ga from the cells tended to decrease with prolongation of the contact time, the excretion from tumor cell being only about 10% after a contact time of 24 h. This indicated a significant delay in excretion in comparison with that of normal skin fibroblasts. This delay in the excretion of 67Ga may be an important factor in the tumor accumulation of 67Ga.</p

Being a Foreigner During the COVID-19 Pandemic: Researcher Positionality in Online Interviews

In meinem Forschungsprojekt habe ich die Veränderung der Beziehung zwischen mir und meinen Interviewpartner*innen im Rahmen von Online-Interviews mit Migrant*innen in Japan während der COVID-19-Pandemie untersucht. Forscher*innen zu feministischen Interviewmethoden haben die komplizierten und wechselnden Machtdynamiken in der Arbeit mit Studienteilnehmenden diskutiert, während andere Forschende die Vor- und Nachteile von Online-Interviews untersucht haben. Die Positionsverschiebungen, die während der Durchführung von Online-Interviews auftreten, wurden jedoch nicht ausreichend analysiert. Anhand des Konzepts being in the moment habe ich geprüft, wie Online-Interviews mit Teilnehmer*innen mit Migrationshintergrund meine Positionierung als Forscherin in Bezug auf eben diese erleichterten, behinderten und veränderten, während ich inmitten der COVID-19-Pandemie meine Feldforschung betrieben habe. Wichtigstes Ergebnis ist, dass sowohl die Teilnehmer*innen als auch ich in der Lage waren, Hintergrundinformationen vor den Interviews auszutauschen, da soziale Netzwerke nach dem Ausbruch der Pandemie weit verbreitet waren. Dies verringerte die potenzielle Distanz, die durch die Forschung auf Entfernung entstanden wäre. Darüber hinaus entdeckten die Migrant*innen und ich Gemeinsamkeiten, die wir als Ausländer*innen während der Pandemie erlebten. Daraus schließe ich, dass Online-Interviews Forschenden und Befragten durch das Teilen verschiedener sozialer und beruflicher Momente während des Forschungsprozesses die Möglichkeit bieten, nach Gemeinsamkeiten zu suchen.In the project underlying this article, I investigated the shift in the researcher-interviewee relationship in the process of online interviews with migrants in Japan during the COVID-19 pandemic. Researchers in feminist interview methods have discussed the intricate and shifting power dynamics with study participants, while other scholars have examined the advantages and disadvantages of online interviews. However, researchers have not sufficiently analyzed the shifts in positionality that occur during online interviews. Using the concept of "being in the moment," I examined how my online interviews with migrant participants facilitated, prevented, and transformed my positionality as a researcher in relation to them while I performed fieldwork during COVID-19. My main findings were that both the participants and I were able to share background information prior to the interviews due to the prevalence of social networking services (SNSs) after the outbreak of the pandemic. This alleviated the potential distance created through the research. Furthermore, the migrants and I found commonalities as foreigners living through the pandemic. Thus, I concluded that online interviews provide opportunities for the researcher and interviewees to seek commonalities through sharing various social and professional moments during the research process.