232 research outputs found
Long-term evolution of the heliospheric magnetic field inferred from cosmogenic Ti activity in meteorites
Typical reconstructions of historic heliospheric magnetic field (HMF) are based on the analysis of the sunspot activity, geomagnetic data or on
measurement of cosmogenic isotopes stored in terrestrial reservoirs like trees
(C) and ice cores (Be). The various reconstructions of are however discordant both in strength and trend. Cosmogenic isotopes,
which are produced by galactic cosmic rays (GCRs) impacting on meteoroids and
whose production rate is modulated by the varying HMF convected outward by the
solar wind, may offer an alternative tool for the investigation of the HMF in
the past centuries. In this work, we aim to evaluate the long-term evolution of
over a period covering the past twenty-two solar cycles by using
measurements of the cosmogenic Ti activity (
yr) measured in 20 meteorites which fell between 1766 and 2001. Within the
given uncertainties, our result is compatible with a HMF increase from
nT in 1766 to nT in 2001, thus
implying an overall average increment of nT over 235
years since 1766 reflecting the modern Grand maximum. The trend
thus obtained is then compared with the most recent reconstructions of the
near-Earth heliospheric magnetic field strength based on geomagnetic, sunspot
number and cosmogenic isotope data.Comment: Accepted for publication in Astronomy and Astrophysic
Bodily feeling in depersonalisation: a phenomenological account
publication-status: Publishedtypes: ArticlePre-print - please cite published version at Sage web site: http://emr.sagepub.com/content/4/2/145.full.pdf+htmlThis paper addresses the phenomenology of bodily feeling in depersonalisation disorder. We argue that not all bodily feelings are intentional states that have the body or part of it as their object. We distinguish three broad categories of bodily feeling: noematic feeling, noetic feeling and existential feeling. Then we show how an appreciation of the differences between them can contribute to an understanding of the depersonalisation experience.ER
Long-term heliomagnetic field variation based on cosmogenic 44Ti in meteorites
Reconstructions of the heliospheric magnetic field (HMF) in the past centuries are mainly based on the analysis of sunspot activity, geomagnetic data or on measurement of cosmogenic radioisotopes stored in terrestrial reservoirs (tree rings and ice cores). There are, however, significant discrepancies among the results obtained by various techniques using different proxies of solar magnetic activity. In this work, new results obtained from a unique approach based on the measurement of the cosmogenic 44Ti activity detected in meteorites are presented and compared with the most recent reconstructions of the near-Earth HMF strength. The very low level of 44Ti activity in several meteorites fallen in the last 250 years was determined by using gamma-ray spectrometers (HPGe+NaI) located in the underground laboratory of Monte dei Cappuccini (INAF-OATo) in Torino, Italy. This approach, specifically designed to overcome the main problems affecting other methods, yields a powerful independent tool to reconstruct the long-term evolution of the HMF through the last two and a half centuries
Emotion and ethics: an inter-(en)active approach
The original publication is available at www.springerlink.comIn this paper we start exploring the affective and ethical dimension of what De Jaegher and Di
Paolo (2007) have called ‘participatory sense-making’. In the first part, we distinguish
various ways in which we are, and feel, affectively inter-connected in interpersonal
encounters. In the second part, we discuss the ethical character of this affective interconnectedness,
as well as the implications that taking an ‘inter-(en)active approach’ has for
ethical theory itself
Improvement of the extraction method of faint signals in γ -activity measurements of meteorites
The final publication is available at Springer via https://doi.org/10.1140/epjp/i2017-11556-yAt the underground laboratory of Monte dei Cappuccini (OATo-INAF) in Torino (Italy) we set up selective HPGe-NaI(Tl) spectrometers for measurements of cosmogenic radioisotopes in meteorites in order to study centennial-scale modulation of solar activity. 44 Ti is a suitable proxy for this timescale, but its detection is difficult due to the strong interference by naturally occurring 214 Bi. In order to optimize the extraction of the 44 Ti signal, we have developed software procedures specifically designed to improve selectivity of the Ge-NaI detectors coincidence
The narrative self, distributed memory, and evocative objects
In this article, I outline various ways in which artifacts are interwoven with autobiographical memory systems and conceptualize what this implies for the self. I first sketch the narrative approach to the self, arguing that who we are as persons is essentially our (unfolding) life story, which, in turn, determines our present beliefs and desires, but also directs our future goals and actions. I then argue that our autobiographical memory is partly anchored in our embodied interactions with an ecology of artifacts in our environment. Lifelogs, photos, videos, journals, diaries, souvenirs, jewelry, books, works of art, and many other meaningful objects trigger and sometimes constitute emotionally-laden autobiographical memories. Autobiographical memory is thus distributed across embodied agents and various environmental structures. To defend this claim, I draw on and integrate distributed cognition theory and empirical research in human-technology interaction. Based on this, I conclude that the self is neither defined by psychological states realized by the brain nor by biological states realized by the organism, but should be seen as a distributed and relational construct
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