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CONTEXT: CO2 and CO gas sensors are very important to recognize the insulation situation of electrical tools. ToCO explore the application of noble metal doped of aluminum nitride nanotubes for gas sensors, DFT computations according to the first principal theory were applied to study sensitivity, adsorption attributes, and electronic manner. In this investigation, platinum-doped aluminum nitride nanotubes were offered for the first time to analyze the adsorption towards CO2 and CO gases. Firm construction of platinum-doped aluminum nitride nanotubes (Pt-AlNNT) was investigated in four feasible places, and the binding energy of firm construction is 1.314 eV. Respectively, the adsorption energy between the CO2 and Pt-AlNNT systems was - 2.107 eV, while for instance of CO, the adsorption energy was - 3.258 eV. The mentioned analysis and computations are considerable for studying Pt-AlNNT as a new CO2 and CO gas sensor for electrical tools insulation. The current study revealed that the Pt-AlNNT possesses high selectivity and sensitivity towards CO2 and CO. METHODS: In this research, Pt-doped AlNNT (Pt-AlNNT) has been studied as sensing materials of CO and CO2 for the first time. The adsorption process of Pt-AlNNT has been computed and analyzed through the DFT approach. DFT computations by using B3LYP functional and 6-31 + G* basis sets have been applied in the GAMESS code for sensing attributes, which contribute to potential applications.
RESUMO
OBJECTIVE: The association of malnutrition with congenital heart disease (CHD) is well documented. Studies comparing the effects of parenteral nutrition (PN) and enteral feeding (EF) on the post-surgical correction of CHD are not available. We compared the effects of PN with EF on the nutritional status of children post-cardiac surgery. METHODS: A retrospective cohort study was conducted with 72 children aged ≤6 years who had at least one heart surgery between 2010 and 2016. Malnutrition was defined as a weight for height Z-score (WHZ) below -2. The primary endpoint was the change in the mean WHZ Z-score from the baseline. All statistical analyses were performed using SPSS 21.0 [Release 21.0.0.0, IBM, USA]. RESULTS: The sample size realized as 72 (n = 72). The overall prevalence of malnutrition was 48%. The change in height of the PN group was significantly higher than the EF group (14.2 ± 7.6 cm vs. 7.4 ± 6.3, P = 0.010), but the weight change was not significantly different (P = 0.28). The post-surgery Z-scores were significantly lower in the PN group and the Z-score change was marginally smaller (P = 0.086), indicating lower growth levels post-surgery. The PN group had a significantly higher incidence of post-surgical malnutrition (P = 0.046). Patients who received PN had significantly less improvement (more negative change) in the Z-score levels compared to the EF group (PE = -1.42, 95% confidence interval [CI] = [-2.48, -0.35]; P = 0.011). CONCLUSION: Malnutrition occurs frequently with CHD. PN does not add any nutritional benefits compared with EF. EF should always be the preferred method of nutrition unless contraindicated.