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The combination of the collecting power of an ELT with an ultra-stable high resolution spectrograph opens up the possibility to measure for the first time directly the dynamical effect of the acceleration of the Universe. CODEX will also provide unique opportunities for advance in many other branches of astrophysics. The CODEX design is based on an array of several identical spectrographs. It is highly modular and can be easily adapted to a large range of sky apertures and telescope diameters. CODEX is designed to work as a seeing limited instrument. The requirements for the telescope are moderate and clearly identified.
The direct comparison of observations to numerical hydro-N-body simulations, although simple in principle, is not always trivial because of possible artificial effects produced by the instrument response and by instrumental and sky background. To overcome this problem we build the software package X-MAS (X-ray MAp Simulator) devoted to simulate X-ray observations of galaxy clusters obtained from hydro-N-body simulations.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html
Using the results of an extended set of high-resolution non-radiative hydrodynamic simulations of galaxy clusters we obtain simple analytic formulae for the dark matter and hot gas distribution, in the spherical approximation.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html
The contribution of rumen microorganisms to the protein absorbed in the intestine is a key factor to evaluate diets for ruminants, and the urinary excretion of purine derivatives (PD) has recently been proposed to estimate rumen microbial protein synthesis in cows (Verbic et al., 1990). This study refers to the relationship between PD excretion and the microbial nitrogen estimated according to recent protein systems for ruminants.
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