72 research outputs found
Future Directions in Astronomy Visualisation
Despite the large budgets spent annually on astronomical research equipment
such as telescopes, instruments and supercomputers, the general trend is to
analyse and view the resulting datasets using small, two-dimensional displays.
We report here on alternative advanced image displays, with an emphasis on
displays that we have constructed, including stereoscopic projection, multiple
projector tiled displays and a digital dome. These displays can provide
astronomers with new ways of exploring the terabyte and petabyte datasets that
are now regularly being produced from all-sky surveys, high-resolution computer
simulations, and Virtual Observatory projects. We also present a summary of the
Advanced Image Displays for Astronomy (AIDA) survey which we conducted from
March-May 2005, in order to raise some issues pertitent to the current and
future level of use of advanced image displays.Comment: 13 pages, 2 figures, accepted for publication in PAS
Influence of allochthonous dissolved organic matter on pelagic basal production in a northerly estuary
Phytoplankton and heterotrophic bacteria are key groups at the base of aquatic food webs. In estuaries receiving riverine water with a high content of coloured allochthonous dissolved organic matter (ADOM), phytoplankton primary production may be reduced, while bacterial production is favoured. We tested this hypothesis by performing a field study in a northerly estuary receiving nutrient-poor, ADOM-rich riverine water, and analyzing results using multivariate statistics. Throughout the productive season, and especially during the spring river flush, the production and growth rate of heterotrophic bacteria were stimulated by the riverine inflow of dissolved organic carbon (DOC). In contrast, primary production and photosynthetic efficiency (i.e. phytoplankton growth rate) were negatively affected by DOC. Primary production related positively to phosphorus, which is the limiting nutrient in the area. In the upper estuary where DOC concentrations were the highest, the heterotrophic bacterial production constituted almost 100% of the basal production (sum of primary and bacterial production) during spring, while during summer the primary and bacterial production were approximately equal. Our study shows that riverine DOC had a strong negative influence on coastal phytoplankton production, likely due to light attenuation. On the other hand DOC showed a positive influence on bacterial production since it represents a supplementary food source. Thus, in boreal regions where climate change will cause increased river inflow to coastal waters, the balance between phytoplankton and bacterial production is likely to be changed, favouring bacteria. The pelagic food web structure and overall productivity will in turn be altered. (C) 2018 The Authors. Published by Elsevier Ltd.Peer reviewe
Recent developments in modeling of the stress derivative of magnetization in ferromagnetic materials
The effect of changing stress on the magnetization of ferromagnetic materials leads to behavior in which the magnetization may increase, or decrease, when exposed to the same stress under the same external conditions. A simple empirical law seems to govern the behavior when the magnetization begins from a major hysteresis loop. The application of the law of approach, in which the derivative of the magnetization with respect to the elastic energy supplied dM/dW is proportional to the magnetization displacement M an−M, is discussed
Acute cervical lymphadenitis and infections of the retropharyngeal and parapharyngeal spaces in children
Recent developments in modeling of the stress derivative of magnetization in ferromagnetic materials
A cost-precision model for marine environmental monitoring, based on time-integrated averages
Theoretical studies of Cr2+(2) GaAs spectra
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