4,917 research outputs found
Seasonal Biomass and Carbohydrate Allocation Patterns in Southern Minnesota Curlyleaf Pondweed Populations
Four southern Minnesota populations of curlyleaf pondweed
(
Potamogeton crispus
L.) were sampled monthly from
January 2001 to November 2002 to determine seasonal phenological,
biomass, and carbohydrate allocation patterns.
Low periods of carbohydrate storage in the seasonal phenological
cycle indicate potentially vulnerable periods in the
plant’s life cycle and may be the ideal time to initiate management
and control efforts
The effect of 24 weeks of moderate intensity walking upon metabolic syndrome risk factors in previously sedentary/low active men
Fragmentos de la política religiosa de un emperador: el caso de Adriano
Neither the concept of “imperial policy” nor of “religion” are easily applied to antiquity. Yet the activities of Roman emperors often did have consequences for religious activity, and their behaviour was not necessarily chaotic or random. Hadrian provides a good case for examining how religious activity was incorporated into ancient biography and historical writing, and how it was related to other fields of imperial conduct. A good deal is recorded about Hadrian’s conduct of religious offices, his building projects and his engagement with older tradition, Roman and foreign. The dossier of testimonia does reveals some consistencies in his behaviour but these seem to derive less from policy than from habits of thought and action. Many of his actions can be interpreted as conventional, even if sometimes performed on an unconventional scale. Hadrian certainly exercised agency, and he had particular dispositions as a ruler. But religious policy seems an anachronistic term to apply to his conduct.Ni el concepto “política imperial” ni el de “religión” son fácilmente aplicables a la Antigüedad. A pesar de ello, la labor de los emperadores romanos tuvo, frecuentemente, un notable impacto sobre la actividad religiosa, y su comportamiento no fue, necesariamente, caótico o aleatorio. Adriano proporciona un buen caso para examinar cómo la actividad religiosa del emperador fue incorporada a las biografías antiguas y a la narración histórica, y cómo estaba relacionada con otros ámbitos de la acción imperial. Nos ha llegado mucha información sobre la actividad adrianea relativa a cargos religiosos, a sus proyectos edilicios y a su vinculación con la tradición anterior, romana y extranjera. El elenco de testimonia revela una cierta consistencia en su comportamiento, pero parece derivar menos de la política que de hábitos de pensamiento y acción. Muchas de sus acciones pueden ser interpretadas como convencionales, incluso si algunas veces se llevaron a cabo a una escala inusual. Ciertamente, Adriano ejerció su voluntad, y tuvo una disposición particular como gobernante. Pero el término “política religiosa” parece un anacronismo al aplicarlo sobre su conducta.
Towards asteroseismology of the non-radial pulsating sdB star PG 1605+072
The recently discovered new class of sdB pulsators (sdBV) offers a powerful
possibility for the investigation of their interior and thus their evolutionary
history. The first step towards applying asteroseismologic tools is the
identification of pulsation modes. We reoport on simultaneous spectroscopic and
multi-band photometric time series observations of PG 1605+072 and analyse its
radial velocity and light curve.Comment: 4 pages, 3 figures, Proc. XIII Workshop on White Dwarfs, eds. D. de
Martino, R. Kalytis, R. Silvotti, J.E. Solheim, Kluwe
Achieving a Strongly Temperature-Dependent Casimir Effect
We propose a method of achieving large temperature sensitivity in the Casimir
force that involves measuring the stable separation between dielectric objects
immersed in fluid. We study the Casimir force between slabs and spheres using
realistic material models, and find large > 2nm/K variations in their stable
separations (hundreds of nanometers) near room temperature. In addition, we
analyze the effects of Brownian motion on suspended objects, and show that the
average separation is also sensitive to changes in temperature . Finally, this
approach also leads to rich qualitative phenomena, such as irreversible
transitions, from suspension to stiction, as the temperature is varied
Time and periodicity from Ptolemy to Schrödinger: paradigm shifts vs continuity in history of mathematics
I briefly consider the Kuhnian notion of "paradigm shifts" applied to the history of mathematics and argue that the succession and intergenerational continuity of mathematical thought was undeservedly neglected in the historical studies. To this end, I focus on the history of mathematical theory of time and periodicity, from Ptolemy's epicycles to Schroedinger's quantum amplitudes interference and contemporary cosmological models
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