D'Angelo P.,University of Rome La Sapienza |
Migliorati V.,University of Rome La Sapienza |
Persson I.,Swedish University of Agricultural Sciences |
Mancini G.,Normal School of Pisa |
And 2 more authors.
Inorganic Chemistry | Year: 2014
A deconvolution procedure has been applied to K-edge X-ray absorption near-edge structure (XANES) spectra of lanthanoid-containing solid systems, namely, hexakis- (dmpu)praseodymium(III) and -gadolinium(III) iodide. The K-edges of lanthanoids cover the energy range 38 (La)-65 (Lu) keV, and the large widths of the core-hole states lead to broadening of spectral features, reducing the content of structural information that can be extracted from the raw X-ray absorption spectra. Here, we demonstrate that deconvolution procedures allow one to remove most of the instrumental and core-hole lifetime broadening in the K-edge XANES spectra of lanthanoid compounds, highlighting structural features that are lost in the raw data. We show that quantitative analysis of the deconvolved K-edge XANES spectra can be profitably used to gain a complete local structural characterization of lanthanoid-containing systems not only for the nearest neighbor atoms but also for higher-distance coordination shells. © 2014 American Chemical Society.
Antonacci E.,UniversitadellAquila |
De Stefano A.,Polytechnic University of Turin |
Gattulli V.,UniversitadellAquila |
Lepidi M.,UniversitadellAquila |
Matta E.,Polytechnic University of Turin
Structural Control and Health Monitoring | Year: 2012
The entire structural identification process, starting from measurement of the experimental response to ambient vibration, and concluding with the assessment of a representative dynamic model, depends upon an informed selection of appropriate data treatment techniques. The paper compares different procedures for identifying both modal and physical models. Four approaches (EFFD, ERA, SSI, and TFIE) for output-only modal identification are discussed. Their performance is evaluated using experimental data extracted from the ambient vibration response of a three-dimensional frame. The discussion of the identification results throws light on the intrinsic characteristics of each procedure, while the particular features of the structure, presenting unexpected local modes, demonstrate the necessity of a hierarchical treatment of the available information, based on a solid engineering knowledge. The calibration of a physical model is approached using an exact inverse procedure, based on a parametric analytical model, or automatic techniques of error minimization, based on finite element multi-models. The achievement of a good relative agreement, measured through performance-based indexes, increases the general confidence on the results independently obtained from each modal identification and model updating method. Copyright © 2011 John Wiley & Sons, Ltd.
Sciahbasi A.,UOC Cardiologia |
Pendenza G.,UniversitadellAquila |
Romagnoli E.,UOC Cardiologia |
Summaria F.,UOC Cardiologia |
And 5 more authors.
Catheterization and Cardiovascular Interventions | Year: 2011
Objectives: To evaluate the efficacy of the new Cobalt-Chromium (Co-Cr) Presillion TM stent for the treatment of high-risk acute myocardial infarction (MI) patients. Background: Percutaneous coronary intervention (PCI) with stent represents the gold standard treatment for acute MI. Methods and Results: We enrolled patients with high-risk acute MI (either ST-segment elevation MI or non-ST-segment elevation MI) treated with PCI using a new Co-Cr bare metal stent with closed cells design and limited balloon compliance. We considered high-risk features as one of the following: age >70 years, ejection fraction <35%, glomerular filtration rate <60 mL/min, diabetes mellitus, rescue PCI, or chronic atrial fibrillation or other conditions requiring long-term oral anticoagulation therapy. Primary outcome of the study was rate of major adverse cardiac events (MACE) defined as all-cause death, new MI, and target-vessel revascularization. A total of 129 consecutive patients were enrolled (69 ± 11 years, 74% men): 71 (55%) patients with ST-segment elevation MI and 58 (45%) patients with non-ST-segment elevation MI. A total of 153 vessels (169 lesions and 179 stents) were treated. The device success rate was high (98.8%). In-hospital MACE rate was 5.4% mainly because of death associated with the acute MI. At 1-year follow-up, the MACE rate was 17.3%, with 11% all-cause death (7.9% of cardiac origin), 0.6% of stent thrombosis, and 4.6% target-vessel revascularization. Conclusions: The use of the Co-Cr Presillion stent in patients with high-risk acute MI treated invasively seems to be safe and efficacious with optimal deliverability and good long-term outcomes and represents a good option in the treatment of these patients. © 2011 Wiley-Liss, Inc.