Magnetic noise contribution of the ferromagnetic core of induction magnetometers

International audienceThe performance of induction magnetometers, in terms of resolution, depends both on the induction sensor and the electronic circuit. To investigate accurately the sensor noise sources, an induction sensor, made of a ferrite ferromagnetic core, is combined with a dedicated low voltage and current noise preamplifier, designed in CMOS 0.35 µm technology. A modelling of the contribution of the ferromagnetic core to the noise through the complex permeability formalism is performed. Its comparison with experimental measurements highlight another possible source for the dominating noise near the resonance

Freedom and listening : Islamic and secular feminist philosophies

In her recent analysis of Islamic feminist philosophies, Aysha Hidayatullah concludes that Islamic feminists need to embrace radical uncertainty, in a path toward freedom. Amina Wadud, on the other hand, argues for a conception of individual freedom as engaged surrender, in which the moral agent is critically engaged in a relationship of trust with God, in the service of social justice. I argue that while openness to uncertainty and transgression of limits are guiding normative principles of western secularism, the attachment to this negative form of freedom can also serve as a form of closure to alternative discourses of freedom, in which freedom is understood as engagement in relationship. I suggest that the ideal of engaged surrender could be taken up as an exemplary form of agency and individual freedom for an understanding of freedom of speech that includes receptivity and listening

In her shoes : transnational digital solidarity with Muslim women, or the hijab?

Transnational solidarity has been taken up by feminist scholars, social scientists and activists who discuss or practice solidarity with the plights of different individuals, groups, and communities. This paper addresses transnational solidarity by investigating World Hijab Day, a campaign that shows solidarity with Muslim women by encouraging non‐Muslim women to temporarily wear the hijab. By analysing online activities and social media of the campaign, and investigating public debates surrounding it, the paper explores the centrality of the hijab as the unifying symbol. Results include reflections on the representations of female Muslimness, the hijab and gender roles in the campaign and insights on implications and possibility of transnational digital solidarity. Using the data, and drawing on literature of transnational solidarity, significance and implications of transnational activism in different online and digital geographies of solidarity are interrogated. The conclusion discusses the values and limits of solidarity activism that is based on notions or symbols of similarity or sameness and the role cyberspace plays in transnational reach of the campaign, and in creating online proximity