18,596 research outputs found
First orbital solution for the non-thermal emitter Cyg OB2 #9
After the first detection of its binary nature, the spectroscopic monitoring
of the non-thermal radio emitter Cyg OB2 #9 (P=2.4yrs) has continued, doubling
the number of available spectra of the star. Since the discovery paper of 2008,
a second periastron passage has occurred in February 2009. Using a variety of
techniques, the radial velocities could be estimated and a first, preliminary
orbital solution was derived from the HeI5876 line. The mass ratio appears
close to unity and the eccentricity is large, 0.7--0.75. X-ray data from 2004
and 2007 are also analyzed in quest of peculiarities linked to binarity. The
observations reveal no large overluminosity nor strong hardness, but it must be
noted that the high-energy data were taken after the periastron passage, at a
time where colliding wind emission may be low. Some unusual X-ray variability
is however detected, with a 10% flux decrease between 2004 and 2007. To clarify
their origin and find a more obvious signature of the wind-wind collision,
additional data, taken at periastron and close to it, are needed.Comment: 15 pages, 4 figures, accepted by Ap
L’esperienza del distacco. Elementi di una filosofia della mistica
This essay aims at clarifying the essence of mystical experience in the main universal religions. To
this effect, the author investigates the notion of ‘detachment’ and, from this, conducts a comparative
analysis of the modes of detachment actually experimented in some religions as well as in philosophic
practice. This is verified through an identification of the specific, paradoxical logic which is
typical of any mystic attitude. The essay then aims at a more rigorous characterization of mystic experience,
by differentiating it from the realm of ethics and by showing the likely consequences of a
mystical approach to politics
Crystal nucleation mechanism in melts of short polymer chains under quiescent conditions and under shear flow
We present a molecular dynamics simulation study of crystal nucleation from
undercooled melts of n-alkanes, and we identify the molecular mechanism of
homogeneous crystal nucleation under quiescent conditions and under shear flow.
We compare results for n-eicosane(C20) and n-pentacontahectane(C150), i.e. one
system below the entanglement length and one above. Under quiescent conditions,
we observe that entanglement does not have an effect on the nucleation
mechanism. For both chain lengths, the chains first align and then straighten
locally. Then the local density increases and finally positional ordering sets
in. At low shear rates the nucleation mechanism is the same as under quiescent
conditions, while at high shear rates the chains align and straighten at the
same time. We report on the effects of shear rate and temperature on the
nucleation rates and estimate the critical shear rates, beyond which the
nucleation rates increase with the shear rate. We show that the viscosity of
the system is not affected by the crystalline nuclei.Comment: 9 page
Spartan Daily, September 11, 2008
Volume 131, Issue 8https://scholarworks.sjsu.edu/spartandaily/10492/thumbnail.jp
Private equity challenge - investment committee paper - de Longhi - investment thesis and value creation strategy
This work project consists of an investment committee paper on De’Longhi, one of the world’s leading firms in the manufacturing of high-end small domestic appliances. Throughout the
paper, several value creation strategies are proposed, based on the analysis of the capabilities and resources of the firm and the markets in which it operates. In the final section, the
returns for this investment are estimated under different operating scenarios and the potential exit options are discussed
Pirandello ed Eduardo messi sotto accusa : la critica cattolica (e non solo)
Both Luigi Pirandello and Eduardo De Filippo were at times criticized by conservative literary critics within the Catholic Church. The monthly Jesuit journal Civilta Cattolica is a point in case. Hardly any play by the Sicilian playwright survived the harsh denigration by staunch Catholic critics. On the other hand, Eduardo De Filippo was censured only for one particular play, De Pretore Vincenzo. Vatican Council II exercised an enormous positive effect on both the Sicilian and the Neapolitan literary evaluation .peer-reviewe
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