[The effect of the indwelling of nasogastric tube on recovery in patients after laryngofission combined with cordectomy and vertical hemilaryngectomy]

Objective:To investigate the effect of the indwelling of nasogastric tube on recovery in patients after laryngofission combined with cordectomy and vertical hemilaryngectomy. Method:A retrospective analysis was performed on 42 patients who underwent laryngofission combined with cordectomy and vertical hemilaryngectomy. According to postoperative indwelling of nasogastric tube or not, patients were divided into two groups of non-indwelling group (Group A, n=20) and indwelling group (Group B, n=22). Furthermore, the incidence of postoperative infection, eating and choking, the time of tracheal tube plugging and postoperative discharge were compared and analyzed between the two groups. Result:The two groups were all returned to normal eating function and successfully removed the endotracheal tube and discharged. There was no significant difference in the incidence of infection, eating and choking between groups (P>0.05); however, the average postoperative plugging time was significantly less in group A than that in group B (P<0.05), and the time of discharge was shorter than that of group B (P<0.01). Conclusion:Postoperative treatment without the indwelling of nasogastric tube after laryngofission combined with cordectomy and vertical hemilaryngectomy can significantly promote the recovery of patients and improve the quality of life of patients.

Effects of annealing on the ferromagnetism and photoluminescence of Cu-doped ZnO nanowires

Room temperature ferromagnetic Cu-doped ZnO nanowires have been synthesized using the chemical vapor deposition method. By combining structural characterizations and comparative annealing experiments, it has been found that both extrinsic (CuO nanoparticles) and intrinsic (Zn(1-x)Cu(x)O nanowires) sources are responsible for the observed ferromagnetic ordering of the as-grown samples. As regards the former, annealing in Zn vapor led to a dramatic decrease of the ferromagnetism. For the latter, a reversible switching of the ferromagnetism was observed with sequential annealings in Zn vapor and oxygen ambience respectively, which agreed well with previous reports for Cu-doped ZnO films. In addition, we have for the first time observed low temperature photoluminescence changed with magnetic properties upon annealing in different conditions, which revealed the crucial role played by interstitial zinc in directly mediating high T(c) ferromagnetism and indirectly modulating the Cu-related structured green emission via different charge transfer transitions.

Non-exponential photoluminescence decay dynamics of localized carriers in disordered InGaN/GaN quantum wells: the role of localization length

In this article, we report a combined experimental and theoretical study on the luminescence dynamics of localized carriers in disordered InGaN/GaN quantum wells. The luminescence intensity of localized carriers is found to exhibit an unusual non-exponential decay. Adopting a new model taking the radiative recombination and phonon-assisted hopping transition between different localized states into account, which was recently developed by Rubel et al., the non-exponential decay behavior of the carriers can be quantitatively interpreted. Combining with precise structure characterization, the theoretical simulations show that the localization length of localized carriers is a key parameter governing their luminescence decay dynamics.