First-Principles Calculation of Principal Hugoniot and K-Shell X-ray Absorption Spectra for Warm Dense KCl

Principal Hugoniot and K-shell X-ray absorption spectra of warm dense KCl are calculated using the first-principles molecular dynamics method. Evolution of electronic structures as well as the influence of the approximate description of ionization on pressure (caused by the underestimation of the energy gap between conduction bands and valence bands) in the first-principles method are illustrated by the calculation. Pressure ionization and thermal smearing are shown as the major factors to prevent the deviation of pressure from global accumulation along the Hugoniot. In addition, cancellation between electronic kinetic pressure and virial pressure further reduces the deviation. The calculation of X-ray absorption spectra shows that the band gap of KCl persists after the pressure ionization of the $3p$ electrons of Cl and K taking place at lower energy, which provides a detailed understanding to the evolution of electronic structures of warm dense matter

留置鼻胃管引发贲门糜烂的个案报道

To report a case of the cardiac erosion caused by indwelling nasogastric tube. Analyzed the reasons of the cardiac erosion from the aspects of the lesion location, influential factors and so on, and put forward new measures to prevent the complication of nasogastric gavage.报告1例留置鼻胃管所引发的贲门糜烂个案。对患者出现贲门糜烂的原因从发生部位、影响因素等多方面进行分析，提出鼻饲并发症预防的新对策