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Americas, Special Report, US
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The physics of brown dwarfs has continuously improved since the discovery of these astrophysical bodies. The first important developments were devoted to the description of their mechanical structure, with the derivation of an appropriate equation of state, and the modelling of their atmosphere characterised by strong molecular absorption. New challenges are arising with progress in observational techniques which provide data of unprecedented accuracy. The goal of this chapter is to describe some of the current challenges for the theory of brown dwarfs. Those challenges concerns atmospheric dust and cloud, non-equilibrium atmospheric chemistry, the effect of rotation and magnetic fields on internal structure and the very early phases of evolution characterised by accretion processes. The field remains lively as more and more high quality observational data become available and because of increasing discoveries of exoplanets. Indeed, many physical properties of giant exoplanets can be described by the same theory as brown dwarfs, as described in this chapter.|You better not get in the way of a bunch of emergency nurses in a hurry. Long before this became a staple line of TV hospital dramas, there was a time when crash carts didn't exist. In those dark ages, medical personnel wasted precious time running around gathering up the necessary materials to care for critically ill patients. In 1968, a registered nurse (RN) in Buffalo, New York, finally had enough. Anita Dorr had served as a U.S. Army nurse in both Europe and Africa during WWII and had risen to the rank of major. Having witnessed the effects of many of the infamous horrors of that conflict, including the concentration camps, she was committed to helping trauma victims as quickly and efficiently as possible. She arranged materials on the top according to where on the patient's body they would be needed. Intubation items, for instance, were at the head, medications in the middle and intravenous materials at the foot.




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