Anti-LSR (full length) polyclonal antibody

In southern power grid, four 500kV composite wall bushings used at a converter station was found significantly aging after 15 years' operation, such as chalking, cracks and low hydrophobicity. The housing material of these wall bushings is liquid silicone rubber (LSR). In order to extend the service life, the out door insulation was repaired by RTV. As the internal failure, one of the four bushings was forced to be out of service. In this paper, the outer shed of the wall bushing was used to evaluate the aging characteristics of the LSR sheds after long term operation. The macroscopic aging characteristics of LSR sheds were investigated by using hydrophobicity and hydrophobicity transfer test, tensile and tear strength test. The microscopic characteristics of the aging sheds were obtained by using Scanning Electron Microsope (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS). It was found that the aging of the LSR shed developed from outer surface into the inside, and the layer structure including the chalking layer and the inner layer was obviously observed. The hydrophobicity, hydrophobicity transfer, tensile strength and tear strength of the aging sheds had different decrease. At microcosmic angle of view, the aging sheds appeared irregular shaped patches with a reduced surface roughness and adhesion; FTIR and XPS results indicated that the side chain groups of PDMS in the chalking layer were oxidized, crosslinked with other polysiloxane chains, forming more Si-O-Si groups, accompanied by the precipitation of TiO2 and white carbon black fillers. Due to the change of silicone rubber material from organic to inorganic, the content of C and Si elements in the chalking layer decreased, and the content of O element increased.The research also shows that, the hydrophobicity and hydrophobicity transfer of the aging LSR sheds can be improved by RTV repairment, but the appearance and hydrophobic changes still needs to be regularly monitored in the operation.

Purpose: Accurate prediction of post-hepatectomy liver failure (PHLF) is important in advanced hepatocellular carcinoma (HCC). We aimed to retrospectively evaluate the utility of gadoxetic acid-enhanced MRI for predicting PHLF in patients who underwent anatomic hepatectomy for HCC with portal vein invasion. Methods: Forty-one patients (32 men, 9 women) were included. Hepatobiliary-phase MR images were acquired 20 min after injection of gadoxetic acid using a 3D fat-suppressed T1-weighted spoiled gradient-echo sequence. Liver-spleen ratio (LSR), remnant hepatocellular uptake index (rHUI), and HUI were calculated. The severity of PHLF was defined according to the International Study Group of Liver Surgery. Differences in LSR between the resected liver and the remnant liver, and HUI and rHUI/HUI between no/mild and severe PHLF were compared using the Wilcoxon signed-rank test and Wilcoxon rank-sum test, respectively. Univariate and multivariate logistic regression analyses were performed to identify predictors of severe PHLF. Areas under the receiver operating characteristic curves (AUCs) of rHUI and rHUI/HUI were calculated for predicting severe PHLF. Results: Nine patients developed severe PHLF. LSR of the remnant liver was significantly higher than that of the resected liver (P < 0.001). Severe PHLF demonstrated significantly lower rHUI (P < 0.001) and rHUI/HUI (P < 0.001) compared with no/mild PHLF. Multivariate logistic regression analysis showed that decreased rHUI (P = 0.012, AUC=0.885) and rHUI/HUI (P = 0.002, AUC=0.852) were independent predictors of severe PHLF. Conclusion: Gadoxetic acid-enhanced MRI can be a promising noninvasive examination for assessing global and regional liver function, allowing estimation of the functional liver remnant and accurate prediction of severe PHLF before hepatic resection.