7,637 research outputs found
A Comparative Analysis of the Equity Outcomes in Three Sugarcane–Ethanol Systems
Get PDFThis article identifies equity outcomes associated with three biofuel systems in Brazil, Ethiopia, and Guatemala. Acknowledging that winners and losers are socially and politically generated, the article identifies some of the factors behind the distribution of winners and losers along different stages of three sugarcane–ethanol supply chains. Analyzing the outcomes for equity within each case study reveals an uneven distribution that, we argue, is related to the procedure and structure of the given sugarcane–ethanol system, and the recognition of the impacts on different actors within those structures. Increasing equity in sugarcane–ethanol systems will require greater openness in decision-making processes, in order that multiple voices are taken into account in the promotion, production, and consumption of biofuels—particularly those of smaller and less powerful actors
Nonlinear tracking control for sensorless permanent magnet synchronous motors with uncertainties
No full textThe recent advanced solution in Marino, Tomei, and Verrelli (2013) to the tracking control problem for sensorless IMs with parameter uncertainties is translated on the basis of letter swap connections between the models of (nonsalient-pole surface) permanent magnet synchronous motors (PMSMs) and induction ones (IMs). The (stability proof-based) nonlinear adaptive position/speed tracking control for sensorless PMSMs (with simultaneous estimation of uncertain constant load torque and stator resistance), which is accordingly obtained by exploring and decoding the design paths in Marino et al. (2013) and which surprisingly represents a simple generalization of the controller in Tomei and Verrelli (2011), constitutes an innovative solution to the related open problem. Illustrative experimental results are included
Considerazioni introduttive sulla flora e sulla vegetazionedelle paludi di Massaciuccoli e di Porta.
No full textStato dell'ambiente e prospettive di tutela nei bacini palustri di Porta, Massaciuccoli, Bientina e Fucecchio.
No full textComparative analysis of different endovascular modalities to treat splenic artery aneurysms
No full textBACKGROUND: Endovascular treatment of splenic artery aneurysms (SAAs) is widely applied in the current clinical practice. The aim of this paper was to describe our single center experience on endovascular treatment of SAAs, comparing the outcomes obtained with two different METHODS: Between January 2010 and December 2021, 35 patients with certain diagnosis of non-ruptured SAA were admitted to our center. Twenty-eight patients treated with packing or sandwich techniques were included in the study analysis. Primary outcome measures analyzed were 30-day mortality and mean hospital stay. Secondary outcome measures analyzed were freedom from splenectomy, and the rate of postembolization syndrome. Chi-square test was used to compare the two endovascular techniques. Statistical significance was defined as P value <0.05. RESULTS: The mean age was 56.5 +/- 12.8 years. Most of patients were females (22, 78.6%). Eighteen patients underwent sandwich technique (Group A), and the remaining 10 packing technique (Group B). Technical success was 100%. Intraoperative and 30-day mortality were 0 in both groups. Mean hospital stay was 4.2 +/- 4.0 days in Group A, and 2.3 +/- 3.9 days in Group B (P=0.93). Postembolization syndrome occurred in 9 cases (50%) in Group A, and in 4 cases (40%) in Group B (P=0.521). Only one patient in Group A (5.5%) required splenectomy (P=0.392). CONCLUSIONS: Packing and sandwich techniques seem to be similarly safe and effective in treating SAAs and have no statistically significant differences in terms of early mortality and morbidity. (Cite this article as: Bertagna G, Troisi N, Torri L, Canovaro F, Tomei F, Adami D, et al. Comparative analysis of different endovascular modalities to treat splenic artery aneurysms. Ital J Vasc Endovasc Surg 2023;30:7-10. DOI: 10.23736/S1824-4777.22.01569-8
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