A MIP-based Energy Calibration of the STAR Endcap Electromagnetic Calorimeter

One of the main goals of the STAR Spin Collaboration is to understand the intrinsic angular momentum of the proton. An integral part of this experiment is the Endcap Electromagnetic Calorimeter (EEMC). The EEMC is used in detecting particles produced from hard proton-proton collisions that end up in the forward direction or \u27end\u27 of the experimental apparatus. In order to use properly the data collected, the energy and position measurements in the EEMC need to be well-known. To accomplish this, an energy calibration of the EEMC was performed using minimum ionizing particles (MIPs). The important property of MIPs utilized was that they will deposit a new amount of energy into a material. Knowing the composition of the EEMC, the expected amount of energy is also known. The MIPs then deposit this energy, which is measured and compared to the expected energy. A calibration constant is then calculated from this comparison. A description of this method and the current status of the energy calibration will be presented with results

Variability in Proto-Planetary Nebulae: IV. Light Curve Analyses of Four Oxygen-Rich, F Spectral-Type Objects

We present new light curves covering 14 to 19 years of observations of four bright proto-planetary nebulae (PPNs), all O-rich and of F spectral type. They each display cyclical light curves with significant variations in amplitude. All four were previously known to vary in light. Our data were combined with published data and searched for periodicity. The results are as follows: IRAS 19475+3119 (HD 331319; 41.0 days), 17436+5003 (HD 161796; 45.2 days), 19386+0155 (101.8 days), and 18095+2704 (113.3 days). The two longer periods are in agreement with previous studies while the two shorter periods each reveal for the first time reveal a dominant period over these long observing intervals. Multiple periods were also found for each object. The secondary periods were all close to the dominant periods, with P2/P1 ranging from 0.86 to 1.06. The variations in color reveal maximum variations in T(eff) of 400 to 770 K. These variations are due to pulsations in these post-AGB objects. Maximum seasonal light variations are all less than 0.23 mag (V), consistent for their temperatures and periods with the results of Hrivnak et al. (2010) for 12 C-rich PPNs. For all of these PPNs, there is an inverse relationship between period and temperature; however, there is a suggestion that the period-temperature relationship may be somewhat steeper for the O-rich than for the C-rich PPNs.Comment: 28 pages, 13 figures, to appear in the Astronomical Journa

La toute-puissance en question ou les enjeux théologico-politiques de la nomination de Dieu

Le discours chrétien comporterait-il une dimension politique ? Jouerait-il nécessairement un rôle sur cette scène ? Quel rôle ? Comment faudrait-il comprendre, dans ce contexte, la référence à la toute-puissance de Dieu ? Voilà quelques-unes des questions que cet article soulève, de façon partielle et latérale en quelque sorte, en cherchant à reconstruire les moments d’un débat, déjà ancien, entre le théologien Erik Peterson et le juriste Carl Schmitt.Does Christian discourse have a political dimension ? Does it necessarily play a role in the sphere of politics ? If so, which role ? How should the reference to the all-mighty power of God be understood in this context ? These are a few of the questions raised by this article, albeit indirectly and partially, as it seeks to reconstruct the key elements of a debate between the theologian Erik Peterson and the jurist Carl Schmitt

Une théologie de la différence sexuelle

Cet article présente la pensée théologique de Gérard Siegwalt sur la sexualité humaine. Quelques-unes des thèses défendues par Siegwalt sont mises en relation avec les débats contemporains autour de la différence sexuelle.This article examines Gérard Siegwalt’s theological thought on human sexuality. Some of his theses are read in the light of contemporary debates about sexual difference