Studies on the System Nitric Acid―Water―Tri-n-butyl Phosphate

It is intended in this study to determine the composition of species formed in the equilibrated organic phase and to clarify the extraction mechanism in the system of HNO₃-H₂O-TBP. Similarly as the previous papers on the systems of mineral acid-H₂O-TBP, physico-chemical measurements of volume swelling, density, viscosity and electrical conductivity were carried out on the equilibrated organic phase, in addition to the conventional distribution measurement of HNO₃ and water between organic and aqueous phases. It was found that the major extracted species are (TBP)₂·HNO₃·H₂O and (TBP)₂·H₂O·H₃0⁺···NO₃－ in the medium acidity region and TBP·HNO₃ and TBP·HNO₃·H₃O⁺··· NO₃－ in the higher acidity region. Apparent degree of dissociation in the organic phase is below 0.05 over the whole range of nitric acid concentration studied, and the extracted species are almost undissociated or ion-paired

Studies on the System Perchloric Acid-Water-Tri-n-Butyl Phosphate

It is intended in this study on the system HClO₄-H₂O-TBP to determine the species formed in the equilibrated organic phase and to clarify the extraction equilibrium in a part of the system. On the same line as the previous papers published in this Memoir, physico-chemical measurements of volume swelling, density, viscosity and electrical conductivity were carried out on the organic phase in addition to the distribution measurements of perchloric acid and water between organic and aqueous phases. The extracting species determined are summarized in Table 1. The species at lower acidity regions are supposed to be almost completely ionized. Dehydration of the organic phase occurs at higher acidity regions. The activities and activity coefficients of the two species [TBP·H₂O] and [(TBP)₂₀H₃O+(H₂O)₂₃]+[ClO₄⁻] stable at the lowest acidity region were determined with Redlich-Kister equations

California USA P V P 2 0 0 4 -2 8 3 0 EVALUATION OF FATIGUE D A M A G E IN COARSE-GRAINED ALUMINUM WITH SCANNING X- RAY E N E R G Y DISPERSIVE DIFFRACTION M I C R O S C O P E

ABSTRACT Based on the Berg-Barrett method, Scanning Energy Dispersive X-ray Diffraction Microscopy (SEDXDM) has been developed for nondestructively evaluating both the surface and subsurface of poly-erystallized materials. The SEDXDM includes an X-ray source generating continuous X-ray spectrum as a key component to form a highly resolved 2-D horizontal cross-sectional digital image. This article presents the evaluation of the fatigue damage (e.g., slip line and slip band caused by fatigue deformation) of the coarse-grained aluminum, which is made by means of annealing and has been repeatedly bent to generate the stress and make the slope of the stress created in the thickness direction of the plate specimen, under fully reversed anti-plane bending condition with the SEDXDM

Outcomes of solitary postoperative recurrence of esophageal squamous cell carcinoma diagnosed with FDG-PET/CT and treated with definitive radiation therapy

Background Surgical resection of esophageal cancer is frequently performed to achieve a complete cure. However, the postoperative recurrence rate is 36.8–42.5%, leading to poor prognosis. Radiation therapy has been used to treat recurrences; solitary recurrence has been proposed as a prognostic factor for radiation therapy, though its significance is unclear. 18F-fluorodeoxyglucose positron emission tomography is a highly accurate diagnostic modality for esophageal cancer. This retrospective study aimed to analyze the outcomes of solitary postoperative recurrences of esophageal squamous cell carcinoma diagnosed with 18F-fluorodeoxyglucose positron emission tomography and treated with definitive radiation therapy. Methods We examined 27 patients who underwent definitive radiation therapy for single or multiple postoperative recurrences of esophageal squamous cell carcinoma between May 2015 and April 2021. 18F-fluorodeoxyglucose positron emission tomography/computed tomography was performed within 3 months before the commencement of radiation therapy. Kaplan–Meier, univariate, and multivariate analyses were performed to examine the overall survival and identify potential prognostic factors. Results The 1-, 2-, and 3-year overall survival rates were 85.2%, 62.6%, and 47.3%, respectively, and solitary recurrence was the only significant factor associated with overall survival (P = 0.003). The 1-, 2-, and 3-year overall survival rates in patients with solitary recurrence were 91.7%, 80.2%, and 80.2%, respectively, and in patients with multiple recurrences they were 80.0%, 50.3%, and 25.1%, respectively. Multivariate analysis also showed solitary recurrence as a significant factor for overall survival. Conclusions When diagnosed with 18F-fluorodeoxyglucose positron emission tomography/computed tomography, solitary recurrence appears to have a more favorable prognosis than multiple recurrences

Jejunal interposition reconstruction with a stomach preserving esophagectomy improves postoperative weight loss and reflux symptoms for esophageal cancer patients

Background: Conventional reconstruction after an esophagectomy uses a gastric tube, which commonly causes several postoperative complaints such as gastric acid reflux in long-term survival cases. Intestinal interposition between the remnant esophagus and the stomach is an option to reduce complaints, and in this study, the advantages of jejunal interposition reconstruction with a stomach preserving esophagectomy (SPE) were assessed. Materials and methods: Eleven cases of jejunal interposition with an SPE and 16 cases with gastric tube reconstruction as a control were subject to a comparison of operation time, amount of bleeding, postoperative quality of life, and endoscopic findings. Results: The SPE group had a longer operation time (SPE: 560 +/- 121 min, control 414 +/- 83 min, P = 0.038), whereas there was no significant difference in blood loss. Postoperative weight loss was significantly recovered in the SPE group (SPE versus control = 94.0 +/- 5.4% versus 87.5 +/- 4.7% at 3 mo, P = 0.017; 97.2 +/- 7.5% versus 85.0 +/- 5.2% at 6 mo, P = 0.010), and there was a significant decrease in the occurrence of reflux symptoms such as heartburn, odynophagia, and cough when jejunal interposition with an SPE was done. Furthermore, reflux esophagitis and Barrett's epithelium were found in six out of 12 cases (50%) of the control group by postoperative endoscopy, while no cases in the SPE group had either condition (P < 0.01). Conclusions: This reconstruction method is a promising option to improve postoperative quality of life, mainly due to the long-term elimination of reflux esophagitis, which assists in the recovery of postoperative weight loss