The Resonance and the Allium ureteral stents in the treatment of non-malignant refractory ureterostenosis

Background Refractory non-malignant ureterostenosis is challenging to treat. The experience to treat the stenosis primarily cause by retroperitoneal fibrosis with the Resonance and Allium metallic stent is still limited. We aim to evaluate the efficacy and safety of these two stents and provide alternative treatment options. Methods A retrospective study was conducted for patients with non-malignant ureterostenosis and treated with the Resonance and Allium stents from March 2011 to September 2020 in our department. The efficacy was evaluated by the change of serum creatinine, glomerular filtration rate (GFR), the proportion of GFR of the affected side and hydronephrosis grade. The safety was evaluated by postoperative presence of moderate or severe overactive bladder (OAB), recurrent urinary infection, pain, stent displacement, encrustation and re-obstruction. Results 33 patients were eligible for the study, including 18 cases treated by the Resonance stents and 15 patients treated by the Allium stents. The patients of two groups had similar age and gender proportion. The cause of ureterostenosis was mainly retroperitoneal fibrosis in both groups but the Resonance group had more idiopathic cases. Follow-up time was significantly longer in the Resonance group than the Allium group (36.2 ± 24.0 vs 9.4 ± 5.0 months, p < 0.001). Both groups showed improvement or maintenance of serum creatinine level, GFR, the GFR proportion of the affected side and hydronephrosis grade after treatment. The Resonance group presented significant higher incidence of moderate or severe OAB, recurrent urinary infection and pain, while the Allium group showed significant more cases of re-obstruction. Conclusion Both the Resonance and Allium stent can relieve the non-malignant refractory ureterostenosis effectively. The Resonance stent may cause more irritable symptoms while the Allium stent may have a higher rate of re-obstruction. The long term efficacy and safety of the Allium stent in treating non-malignant refractory ureterostenosis requires further study.

Personalized Recommendations Based on Sentimental Interest Community Detection

Communities have become a popular platform of mining interests for recommender systems. The semantics of topics reflect users’ implicit interests. Sentiments on topics imply users’ sentimental tendency. People with common sentiments can form resonant communities of interest. In this paper, a resonant sentimental interest community-based recommendation model is proposed to improve the accuracy performance of recommender systems. First, we learn the weighted semantics vector and sentiment vector to model semantic and sentimental user profiles. Then, by combining semantic and sentimental factors, resonance relationship is computed to evaluate the resonance relationship of users. Finally, based on resonance relationships, resonant community is detected to discover a resonance group to make personalized recommendations. Experimental results show that the proposed model is more effective in finding semantics-related sentimental interests than traditional methods.

Investigations on the spectrum of selenium V-Structure of Se II

Besides the very early work summarized in Kayser's 'Handbuch' the first considerable list of lines due to singly ionized selenium was given by L. and E. Bloch in 1930. These authors used an electrodeless discharge through selenium vapour and ascribed the lines to the several stages of ionization of the atom by inserting a variable auxiliary gap in series with the discharge tube. Larcroute also investigated the spectrum from λ 2200 to λ 1200. These measurements, however, were not sufficiently complete, and did not extend far enough into the extreme ultra-violet to enable an analysis of the spectrum of Se II to be under-taken, and up to the present there are no published records of any attempts at such an analysis. The present paper, one of a series, deals with the essential features of the quartet and doublet systems found to be characteristic of the singly ionized atom of Se. More than 200 lines have been classified, comprising a majority of the important lines of the spectrum and several of the faint ones. There are, however, some definite groups of lines which are not accounted for by the set of identified terms; these groups lie chiefly in the extreme quartz and the fluorite regions and it would seem that they probably arise from double electron transitions and combinations with sp 4 terms. When the analysis had been obtained, a very irregular feature was observed regarding the intensity of the fundamental resonance group 4 p 4 S - 5 s 4 P; this is discussed in a later section.