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Pinching in Steel Rack Joints: Numerical Modelling and Eff ects on Structural Response
Federico Gusella,Maurizio Orlando,Paolo Spinelli 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.1
The structural behaviour of beam-to-column joints plays a key role in the seismic response of frame structures. Regarding to steel storage pallet racks, experimental tests have highlighted that the hysteresis loop of their joints is characterized by the pinching, with the consequence of a reduction of the dissipated hysteretic energy and load carrying capacity. In this paper the authors propose a simplifi ed numerical pinching model capable to simulate the mechanical response of beam-tocolumn joints under cyclic loads. To develop and check this model, several comparisons are performed with both literature data and experimental results of laboratory tests. The proposed model is characterised by three links placed in parallel: two “composed links” describe the non-linear bending moment-rotation curve of the joint, and a linear elastic link transfers the axial and shear force from the beam to the column. The model is appropriate for predicting the down-aisle seismic response of rack systems and it can be easily implemented in commercial software packages, commonly used for non-linear seismic vulnerability analyses. Moreover, features of the model can be estimated from a few structural data and it does not require to perform expensive cyclic experimental tests. For a deeper understanding of the eff ects of pinching in the seismic response and to highlight the potentiality of the proposed model a case-study example is also considered. The case-study concerns a rack system, whose beam-to-column joints are modelled using two numerical approaches which diff er in the deterioration of the rotational stiff ness of joints. Non-linear dynamic analyses, with simulated ground acceleration time-histories, have been carried.
Federico Coccolini,Luca Campanati,Fausto Catena,Valentina Ceni,Marco Ceresoli,Jorge Jimenez Cruz,Marco Lotti,Stefano Magnone,Josephine Napoli,Diego Rossetti,Pierandrea De Iaco,Luigi Frigerio,Antonio P 대한부인종양학회 2015 Journal of Gynecologic Oncology Vol.26 No.1
Objective: Cytoreductive surgery (CRS) and hyperthermic intraperitoneal chemotherapy (HIPEC) have been recently reported with favorable oncological outcomes as treatment of advanced epithelial ovarian cancer (EOC). The aim of this study was to demonstrate the feasibility of CRS+HIPEC with cisplatin and paclitaxel for the treatment of advanced EOC. Methods: This is a prospective observational study of 54 patients, from April 2007 to October 2013, with primary or recurrent peritoneal carcinomatosis due to EOC. The mean age was 54.51±9.34. Thirty patients (59%) had primary EOC, and 24 patients (41%) had recurrent disease. Results: Mean peritoneal cancer index was 10.11 (range, 0 to 28), complete cytoreduction (CC0) was achieved for 47 patients (87%), CC1 for seven patients (13%). Patients with suboptimal cytoreduction (CC2 and CC3) were not included in the study. The mean stay in intensive care unit was 4.73±5.51 days and the mean hospitalization time was 24.0±10.03 days. We did not observe any intraoperative death. Seven patients (13%) required additional operations. Three patients (5.6%) died within 30 days from the procedure. Severe complications were seen in 19 patients (35.2%). During the follow-up period, disease recurred in 33 patients (61.1%); the median disease-free survival time was 12.46 months and the median overall survival time was 32.91 months. Conclusion: CRS+HIPEC with cisplatin and paclitaxel for advanced EOC is feasible with acceptable morbidity and mortality. Additional follow-up and further studies are needed to determine the effects of HIPEC on long term survival.
Flow recovery after posterior clinoidectomy for surgical clipping of anterior choroidal aneurysm
Federico Carlos Gallardo,Juan Santiago Bottan,Clara Martin,Aylen Andrea Targa Carcia,Roman Pablo Arevalo,Pablo Augusto Rubino 대한뇌혈관외과학회 2021 Journal of Cerebrovascular and Endovascular Neuros Vol.23 No.4
Inadvertent flow alterations in the parent artery during microsurgical clipping might produce postoperative ischemic complications. Intraoperative recognition of such alterations and its correction might improve operative outcomes in these patients. We present the case of a thirty-five-year-old male with an incidental small left anterior choroidal aneurysm. Microsurgical clipping induced an external compression of the anterior choroidal artery against the posterior clinoidal process which was identified in situ through surgical exploration and the loss of arterial doppler signal in the vessel. After failed attempts at clip repositioning, a posterior clinoidectomy was performed to decompress the artery. This resulted in arterial flow recovery. The aneurysm was successfully treated, and a severe ischemic complication was likely avoided. This intraoperative phenomenon has not yet been described in the literature.
Characterization of Escherichia coli EutD: a Phosphotransacetylase of the Ethanolamine Operon
Federico P. Bologna,Valeria A. Campos-Bermudez,Damián D. Saavedra,Carlos S. Andreo,María F. Drincovich 한국미생물학회 2010 The journal of microbiology Vol.48 No.5
The Escherichia coli genes pta and eutD encode proteins containing the phosphate-acetyltransferase domain. EutD is composed only by this domain and belongs to the ethanolamine operon. This enzyme has not been characterized yet, and its relationship to the multimodular E. coli phosphotransacetylase (Pta) remains unclear. In the present work, a detailed characterization of EutD from E. coli (EcEutD) was performed. The enzyme is a more efficient phosphotransacetylase than E. coli Pta (EcPta) in catalyzing its reaction in either direction and assembles as a dimer, being differentially modulated by EcPta effectors. When comparing EutD and Pta, both from E. coli, certain divergent regions of the primary structure responsible for their unique properties can be found. The growth on acetate of the E. coli pta acs double-mutant strain, was complemented by either introducing EcEutD or by inducing the eut operon with ethanolamine. In this case, the expression of a phosphotransacetylase different from Pta was confirmed by activity assays. Overall, the results indicate that EcEutD and Pta, although able to catalyse the same reaction, display differential efficiency and regulation, and also differ in the induction of their expression. However, under certain growth conditions, they can fulfil equal roles in E. coli metabolism.
Federico Di Maria,Mikael Mazighi,Maéva Kyheng,Julien Labreuche,Georges Rodesch,Arturo Consoli,Oguzhan Coskun,Benjamin Gory,Bertrand Lapergue 대한뇌졸중학회 2018 Journal of stroke Vol.20 No.3
Background and Purpose Recent single-center series and meta-analyses suggest that mechanical thrombectomy (MT) without prior intravenous thrombolysis (IVT) might be equally effective to bridging therapy. We analyzed, within the Endovascular Treatment in Ischemic Stroke (ETIS) prospective observational registry, the angiographic and clinical outcomes after IVT+MT versus MT alone. Methods From December 2012 to December 2016, a total of 1,507 consecutive patients with a proximal arterial occlusion of the anterior circulation were treated by MT. Of these, 975 (64.7%) received prior IVT. Immediate angiographic and clinical outcomes at 90 days (modified Rankin Scale [mRS]) were compared between the two groups while checking for propensity score, matchedpropensity score and by inverse probability of treatment weighting (IPTW) propensity score method. Results Favorable outcome (mRS 0 to 2) was more frequently achieved after IVT+MT (n=523, 53.6%) than after MT alone (n=222, 41.8%) with an unadjusted odds ratio (OR) for bridging therapy of 1.61 (95% confidence interval [CI], 1. 29 to 2.01). This difference remained not significant in matched-propensity score cohort (OR, 1.21; 95% CI, 0.90 to 1.63) although it remained according to adjusted propensity score (OR, 1.31; 95% CI, 1.02 to 1.68) and IPTW (OR, 1.37; 95% CI, 1.09 to 1.73) analyses. A significant difference was found in terms of excellent outcome (mRS 0 to 1) (adjusted OR, 1.63; 95% CI, 1.25 to 2.11) and successful reperfusion (adjusted OR, 1.58; 95% CI, 1.33 to 2.15). No differences in intracerebral hemorrhage or in allcause mortality within 90 days were found between groups. Conclusions IVT prior to MT is associated with increased excellent outcome and successful reperfusion rates. These findings support the use of bridging therapy.
Learning Linguistics by Doing: The Secret Virtues of a Language Constructed in the Classroom
Federico Gobbo 세종대학교 언어연구소 2013 Journal of Universal Language Vol.14 No.2
The teaching of second languages in school classrooms is often conducted through the use of ‘direct’ and ‘immersion’ methods, while grammar is reserved for the first language. However, pupils spontaneously raise important questions for general and theoretical linguistics which could be better addressed through an interlinguistic comparison of first and second language grammars in the pupils’ repertoires. This paper explains the method used in a pilot experiment in fieldwork. The experiment was conducted in the fourth class of a Montessori primary school, where pupils constructed from scratch a posteriori language to be used for secret communication among themselves―but not to be used with the rest of the school. During the process of the construction of this language, all aspects were discussed in the class: phonetics and writing systems, morphology and syntax, semantics and pragmatics. The main educational result was the increase in pupils’ metalinguistic awareness, as well as the confidence that they gained in their own language proficiency.