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H-Diplo Roundtable XXI-28 on Tworek. News from Germany: the competition to control world communications, 1900-1945
No description supplie
Variable stars and stellar populations in Andromeda XXI: II. Another merged galaxy satellite of M31?
B and V time-series photometry of the M31 dwarf spheroidal satellite
Andromeda XXI (And XXI) was obtained with the Large Binocular Cameras at the
Large Binocular Telescope. We have identified 50 variables in And XXI, of which
41 are RR Lyrae stars (37 fundamental-mode RRab, and 4 first-overtone RRc,
pulsators) and 9 are Anomalous Cepheids (ACs). The average period of the RRab
stars ( = 0.64 days) and the period-amplitude diagram place And~XXI in the
class of Oosterhoff II - Oosterhoff-Intermediate objects. From the average
luminosity of the RR Lyrae stars we derived the galaxy distance modulus of
(m-M)= mag, which is smaller than previous literature
estimates, although still consistent with them within 1 . The galaxy
color-magnitude diagram shows evidence for the presence of three different
stellar generations in And~XXI: 1) an old ( 12 Gyr) and metal poor
([Fe/H]=1.7 dex) component traced by the RR Lyrae stars; 2) a slightly
younger (10-6 Gyr) and more metal rich ([Fe/H]=1.5 dex) component populating
the red horizontal branch, and 3) a young age ( 1 Gyr) component with
same metallicity, that produced the ACs. Finally, we provide hints that And~XXI
could be the result of a minor merging event between two dwarf galaxies.Comment: accepted for publications in Ap
Инструменты и коммуникационные стратегии внешней политики в теории международных отношений
The purpose of this article is to analyze the nature of non-military instruments (economic sanctions, soft power and communication strategies) of foreign policy within the international relations theory, because these tools are becoming increasingly central to shaping
strategic outcomes in the XXI centuryМета цієї статті - проаналізувати природу невійськових
інструменти (економічні санкції, м'яка влада та комунікації
стратегії) зовнішньої політики в рамках теорії міжнародних відносин, тому що ці інструменти стають все більш центральними у формуванні стратегічні результати у XXI стЦелью данной статьи является анализ характера невоенных
инструменты (экономические санкции, мягкая сила и связь
стратегии) внешней политики в рамках теории международных отношений, потому что эти инструменты становятся все более важными для формирования стратегические итоги в XXI век
Scattering states in Bethe-Salpeter equation
The off-mass shell scattering amplitude, satisfying the Bethe-Salpeter
equation for spinless particles in Minkowski space with the ladder kernel, is
computed for the first time.Comment: 7 pages, 3 figures. Presented at the XXI International Baldin Seminar
on High Energy Physics Problems, September 10-15, 2012, JINR, Dubna, Russia.
To be published in the online journal Proceedings of Science - PoS(Baldin
ISHEPP XXI)027 (2012
Book Review: Mirage (Kanal in Tamil)
Book review of Mirage (Kanal in Tamil). By K. Daniel. Translated by Subramaniam Jebanesan. Colombo, Sri Lanka: Kumaran Book House, 2016, xxi +321 pages
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