Solution Manual For Bioseparations Science And Engineering
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Ablative thermal protection systems (TPS) allowed the first humans to safely return to Earth from the moon and are still considered as the only solution for future high-speed reentry missions. But despite the advancements made since Apollo, heat flux prediction remains an imperfect science and engineers resort to safety factors to determine the TPS thickness. This goes at the expense of embarked payload, hampering, for example, sample return missions. Ground testing in plasma wind-tunnels is currently the only affordable possibility for both material qualification and validation of material response codes. The subsonic 1.2MW Inductively Coupled Plasmatron facility at the von Karman Institute for Fluid Dynamics is able to reproduce a wide range of reentry environments. This protocol describes a procedure for the study of the gas/surface interaction on ablative materials in high enthalpy flows and presents sample results of a non-pyrolyzing, ablating carbon fiber precursor. With this publication, the authors envisage the definition of a standard procedure, facilitating comparison with other laboratories and contributing to ongoing efforts to improve heat shield reliability and reduce design uncertainties. The described core techniques are non-intrusive methods to track the material recession with a high-speed camera along with the chemistry in the reactive boundary layer, probed by emission spectroscopy.
An evaluation of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) as a technique to determine the uranium/lead isotope ratio of a historical meteorite (a 4417-million-year-old meteorite from the Migadore impact region, Namibia) is reported. The meteorite was selected for an experiment in the Los Alamos Neutron Science Center (LANSCE) to examine the consequences of various cosmic-ray exposures. Previous work on this specimen detected an anomalous isotopic composition of uranium and lead, with significant differences in the isotope ratio of the detected uranium from the bulk rock. The uranium/lead isotope ratio of the current meteorite was measured by LA-ICP-MS and compared with the bulk rock and the uranium/lead ratio of the bulk meteorite to assess the effects of cosmic-ray exposure on the isotope composition of uranium and lead. Results show a good agreement between the bulk rock and the current meteorite for the measured isotope ratios of uranium and lead and reveal no significant change in the isotope ratios of uranium and lead in the meteorite since it was last exposed to cosmic radiation.
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