1,240 research outputs found
Massive Carbon Dioxide Embolism During Laparoscopic Liver Resection: A Case Report
No full textCarbon dioxide embolism during laparoscopic surgery is a serious and life-threatening complication. The overall incidence of embolism during laparoscopic surgery is low (0.15%). Although the potential fatal consequences of this complication are reported in literature, a well-documented report of the effect of massive CO2 embolism during laparoscopic liver resection on cardiovascular, respiratory and encephalographic parameters does not exist. The authors describe a well-documented case of massive carbon dioxide embolism during laparoscopic liver resection suspected by both hemodynamic instability and elevation of EtCO2 and confirmed by arterial blood gas. The surgeon's rapid closure of the vascular breach resulted in an overall improvement of the patient's vital signs without further consequences. Our case report shows the cardiovascular, respiratory and encephalographic effects of a massive carbon dioxide embolism and highlights the importance of a strict cooperation between the surgeon and the anesthesiologist and the importance for a prompt treatment when massive carbon dioxide embolism occurs
Santa Giulia : abitare in attesa. Congetture sul futuro e ipotesi per il presente di un grande quartiere cantiere di Milano
No full textLAUREA MAGISTRALEIl presente studio di tesi si occupa dello studio del quartiere di Milano Santa Giulia, localizzato nell’area Sud-Est del Comune di Milano e sorto nel 2005 in seguito alla realizzazione di un Masterplan firmato da Norman Foster. Il progetto, che interessava le aree ex industriali delle acciaierie Redaelli e della Montedison, prevedeva la riqualificazione dell’area e mirava alla costruzione di una nuova “città nella città”, dove sarebbero dovute sorgere importanti funzioni urbane e un quartiere multifunzionale efficiente e autonomo. Il progetto si è tuttavia interrotto nel 2009. Il risultato è che molte aree sono rimaste incompiute e altre sono state poste sotto sequestro. La tesi consta di due parti. La prima è dedicata alla ricostruzione del processo di trasformazione dell’area, all’analisi critica del progetto e allo studio del contesto territoriale Sud-Est di Milano, con il quale il quartiere si relaziona. Vengono inoltre condotte delle ricerche sullo studio delle dinamiche di uso del quartiere, utili all’individuazione delle problematiche e delle necessità degli abitanti. La seconda parte si occupa invece dello studio e dell’investigazione del futuro dell’area. Sono state quindi formulate alcune congetture sui molteplici futuri possibili che potrebbero interessare il quartiere. In seguito si è proceduto all’approfondimento di uno tra gli scenari possibili: “il quartiere abitabile”. Lo scenario propone l’individuazione di alcuni interventi, organizzati in una strategia complessiva di applicabilità nel contesto specifico e sviluppati secondo i tre atteggiamenti chiave dello scenario: riuso, mitigazione e connessione. Gli interventi proposti mirano al miglioramento dell’abitabilità del quartiere nell’arco di tempo che intercorre tra lo stato attuale e il momento in cui le aree bloccate verranno dissequestrate. Infine viene effettuato un breve approfondito su uno degli interventi, la riconfigurazione della Promenade di Via Cassinari, ovvero quello ritenuto maggiormente efficace nel produrre effetti positivi sull’abitabilità del quartiere.The thesis interests the study of a neighborhood of Milano, Santa Giulia, located in the South-East of the city. The project for the renewal of the area started in the 2005 with the Masterplan of the architect Norman Foster. The project interested the ex industrial areas of the Redaelli’s steelworks and of the Montedison. It planned the renewal of the area and the aim was to create the new “città nella città”, a new multi-functional and autonomous neighborhood where should have been created several important functions. The project was interrupted in the 2009. The result is an unfinished district where several areas were sequestrated. The thesis is organized by two parts. The first one deals with the recognition of the historical events of the transformation process of the area, the critical analysis of the project and the study of the territorial context of the South-East of Milan. There is also a study of the social practices of the inhabitants, the study of the problems and of the needs of the citizens. The second part deals with the study and the investigation of the future of the area. It have been formulated seven conjectures about the possible futures of the area. Then one conjecture, called “The livable neighborhood”, is been studied in deep. The scenario proposes several intervention, organized in a complex strategy and in reference to three guide lines of the scenario: reuse, mitigation and connection. The interventions proposed before aim to the improvement of the livability of the neighborhood from now until the rest of the areas will be unlock. Finally it has been studied one of the interventions, the reconfiguration of the Promenade in Via Cassinari, the most effective action for the improvement of the livability of the area
Un lavoro seminale sull’urbanistica di Bernardo Secchi. Postfazione
No full textIl testo commenta i caratteri della ricerca che la curatrice ha condotto ai fini della costruzione del libro, mettendo in evidenza che si tratta di un lavoro seminale sull'urbanistica di Bernardo Secchi. Poi delinea alcuni aspetti dell'opera di Secchi nelle diverse stagioni della sua attività, come urbanista italiano e come intellettuale e progettista europeo
Giulia Veronica Varisco
No full textThe headword explains the biography and the contribution of the author Giulia Varisco to the children's literatur
THE ROLE OF (SUB-)STELLAR COMPANIONS ON THE DYNAMICAL EVOLUTION OF PROTOPLANETARY DISCS
No full textThe study of planet formation has become progressively more important in the last few years given the great number of diverse exoplanets recently discovered. It is, indeed, only by studying extrasolar planetary systems embedded in their natal (protoplanetary) discs that we can make statistical studies of the range of outcomes of the planet formation process. In particular, the discs that present a cavity (transitional discs) or a gap in the dust radial profile are related to disc
clearing mechanisms by young giant planets.
In this Thesis, we analyze observations taken with the most advanced telescopes (ALMA and VLT/SPHERE) combining multi-wavelength observations to discriminate between different formation processes in systems with disc sub-structures. We provide a general overview on protoplanetary discs and planets/binaries, followed by the description of dust and gas dynamics and thermal disc structure. Moreover, we describe the two most accredited scenarios of planet formation: core accretion and gravitational instability.
In the second part of the Thesis, we present a work on the dust and gas cavity of the disc around CQ Tau observed with ALMA together with thermochemical models and hydro-dynamical simulations, which provide insight on a massive planet responsible for the clearing of such disc structure. Secondly, we describe an analysis done on a survey of 22 Herbig and F/G type stars imaged by SPHERE that confirms that the large near-infrared excess observed in the SEDs of Group I Herbig stars can be explained by the presence of a large gap in their discs. We spatially resolve spirals in HD 100453, HD 100546, CQ Tau; ring-like disc in HD 169142 and HD 141569; and single inclined thin disc in AK Sco and T Cha. We compare the results with ALMA and PDI observations and with simulations. Moreover, we detect and confirm the presence of a novel gravitationally bound companion to the young MWC 297 star. Finally, we describe a novel routine that exploits the known radial variation of stellar artifacts with wavelength together with the spectral slope of the star
Dual effects of leptin in perioperative gas exchange of morbidly obese patients
No full textLeptin has shown positive effects on respiratory function in experimental settings. The role of leptin on perioperative respiratory function in morbidly obese patients has not been established. We performed a retrospective analysis of morbidly obese patients undergoing laparoscopic sleeve gastrectomy. Fasting serum leptin and interleukin (IL)-6 were measured preoperatively, and arterial blood gases were obtained pre- and postoperatively. Outcome variables were arterial partial pressure of oxygen (PaO2), arterial partial pressure of carbon dioxide (PaCO2), and differences in PaO2 and PaCO2 between pre- and postoperative values (ΔPaO2, ΔPaCO2; postoperative minus preoperative). Patients with lower (<40 μg/L) and higher (≥40 μg/L) leptin levels were compared. Bravais-Pearson's correlation, multiple linear regression, and logistic regression analysis were performed. A total of 112 morbidly obese patients were included. Serum leptin was significantly higher in females than in males (42.86±12.89 vs. 30.67±13.39 μg/L, p<0.0001). Leptin was positively correlated with body mass index (r = 0.238; p = 0.011), IL-6 (r = 0.473; p<0.0001), and ΔPaO2 (r = 0.312; p = 0.0008). Leptin was negatively correlated with preoperative PaO2 (r = -0.199; p = 0.035). Preoperative PaO2 was lower, ΔPaCO2 was smaller, and ΔPaO2 was greater in the high leptin group than in the low leptin group. In multiple regression analysis, leptin was negatively associated with preoperative PaO2 (estimate coefficient = -0.147; p = 0.023). In logistic regression analysis, leptin was associated with improved ΔPaO2 (odds ratio [OR] = 1.104; p = 0.0138) and ΔPaCO2 (OR = 0.968; p = 0.0334). Leptin appears to have dual effects related to perioperative gas exchange in obese patients undergoing bariatric surgery. It is associated with worse preoperative oxygenation but improved respiratory function after surgery
Ytterbium Disilicate/Monosilicate Multilayer Environmental Barrier Coatings: Influence of Atmospheric Plasma Spray Parameters on Composition and Microstructure
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Ytterbium Disilicate/Monosilicate Multilayer Environmental Barrier Coatings: Influence of Atmospheric Plasma Spray Parameters on Composition and Microstructure
by Giulia Di Iorio,Laura Paglia *ORCID,Giulia PedrizzettiORCID,Virgilio GenovaORCID,Francesco MarraORCID,Cecilia BartuliORCID andGiovanni PulciORCID
INSTM Reference Laboratory for Materials and Surface Engineering, Sapienza University of Rome, Eudossiana 18, 00184 Rome, Italy
*
Author to whom correspondence should be addressed.
Coatings 2023, 13(9), 1602; https://doi.org/10.3390/coatings13091602
Original submission received: 10 August 2023 / Revised: 31 August 2023 / Accepted: 11 September 2023 / Published: 13 September 2023
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Abstract
SiC/SiC ceramic matrix composites (SiCf/SiC CMCs) are regarded as the new materials for the hot-section components of aircraft gas turbine engines, since they have one-third of the density of metallic superalloys, a higher temperature capability, good mechanical strength, and excellent thermal shock resistance. However, high-temperature water-vapor-rich combustion gases can induce severe surface recession phenomena in SiC/SiC leading to component failure. For this reason, it is necessary to design protective coatings, i.e., environmental barrier coatings (EBCs), able to protect the SiC/SiC surface in combustion environments. In the present work, ytterbium monosilicate (Yb2SiO5), stable when exposed to water vapor at high temperatures, and ytterbium disilicate (Yb2Si2O7), characterized by a thermal expansion coefficient closer to that of the substrate, were selected for a multilayer EBC system. EBCs were processed using the atmospheric plasma spray (APS) technique. A set of deposition parameters were tested, varying the power of the torch, and the composition and microstructure of the deposited coatings were studied in terms of porosity, crack density, and post-deposition phase retention by performing SEM, EDS, and XRD analysis. The results allow for the definition of the influence of deposition parameters on the final properties of multilayer EBC coatings
Correction to: Safety and Psychological Outcomes of Tandem t:Slim X2 Insulin Pump with Control-IQ Technology in Children, Adolescents, and Young Adults with Type 1 Diabetes: A Systematic Review
No full textThe second author name was incorrectly published as Giula Maria Smylie. The correct name is Giulia Marie Smylie. The original article has been corrected
Fragmentation mechanisms revealed trough the ash morphology and texture at Sakurajima volcano (Japan)
No full textVolcanic ash represents a fundamental source of information on eruptive processes occurring both prior and after explosive eruptions. In particular, many studies evidenced how volcanic ash can be used to extract unique information about the style of volcanic activity and the relative fragmentation processes. We present a detailed study of ash collected during classical vulcanian activity at Sakurajima volcano (Japan), aimed at investigating the relationships between eruption dynamics and the key features of the resulting volcanic ash (e.g. shape and texture). Information about fragmentation mechanism is revealed by a comprehensive investigation over a complete sequence of activity observed in summer 2013 and October 2014. Based on SEM imaging of the ash samples, 4 main categories (Blocky Irregular, Blocky Regular, Rough-Vesicular, and Rough) have been defined. These characterize all the different phases observed in the eruptive activity, without showing important changes in concentration or morphology. The ash morphology has been then quantitatively defined trough a set of shape parameters, and compared with textural features (ground mass
crystallinity, vesicularity) in order to outline the relations with different styles of activity observed during the whole sequence. An exhaustive quantitative dataset on the shape and textural variability of Sakurajima ash provide important insights into magma fragmentation mechanisms and their relations with the evolution of eruptive dynamics.
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