1,721,506 research outputs found
SLC: problematiche relative alla determinazione del contenuto in campioni massivi
No full textIL capitolo confronta dati sperimentali e di letteratura sulla problematica della determinazione della quantità di SLC in campioni reali provenienti da compartivi lavorativ
Can Arsenic be trapped by calcite? An X-Ray absorption spectroscopy study
No full textIn this study, three different and complementary approaches are undertaken, with the aim of ascertaining the effectiveness of the carbonate arsenite substitution process under natural conditions, by studying travertines coming from a geogenic As anomaly in Southern Tuscany (middle Pecora River Valley)
Minero-chemical and spectroscopic investigations of natural and synthetic sphalerite
No full textHighlights of the study for the PhD thesis carried out by the autho
Rolling particle lithography by soft polymer microparticles
No full textElastomeric polymeric microspheres are employed as a direct-writing tool for the continuous delivery of molecular materials. The mechanical properties enabling patterning are investigated and modelled. The proposed approach provides a low cost and versatile lithographic method for transferring features with real-time dynamic control. This journal is © 2013 The Royal Society of Chemistry
A methodology to orient carbon nanotubes in a thermosetting matrix
No full textA new procedure for the alignment of carbon nanotubes in a thermosetting matrix is proposed in this study. The two-step approach is based on (i) the alignment of carbon nanotubes (CNTs) in thermoplastic fibres by electrospinning and (ii) the transfer of these nanocompositefibres into a reactive thermosetting resin, in which they are easily soluble. After fibre dissolution, the CNTs remain aligned in the cured thermosetting matrix.The proof of concept is demonstrated by producing electrospunpolymethyl methacrylate (PMMA) fibres filled with single wall carbon nanotubes (SWCNTs) in the form of unidirectional tape, which are then solubilised into a vinylester (VE) matrix. The PMMA is easily dissolved by the styrene present in the VE resin, leaving SWCNTs aligned in the cured VE network, as confirmed by Raman spectroscopy studies. A 50% increase in elastic modulus (SWCNT 1.3. wt.%) has been obtained by dynamic mechanical analysis carried out in tensile mode at 1. Hz. Thanks to its ability to orient carbon nanotubes in a thermosetting matrix, the proposed method can be exploited also to transfer oriented nanofillers into continuous fibre composites, thus obtaining multiscale or hierarchical composites. © 2014 Elsevier Ltd
ASO Author Reflections: Robotic Perihilar Cholangiocarcinoma Beyond Technical Feasibility
No full text
Nuovo riesame delle "calcosine" del Museo di Mineralogia di Firenze
No full textthe chemical composition of several specimens of the Mineralogical Museum of Florence was established usign optical and SEM microscopy and WDS microanalysis (EPMA). THe speciemens are attributed to chalcocite, djurleite, anilite on the basis of theier Cu/S ratio. Fe is both minor substituent for Cu and trace element, which allows the correct attribution of digenite Finally, Ag-bearing varieties of chalcocite, djurleite, and digenite are identified with Ag-content ranging up to 0.009 atoms per formula unit
First Case of Full Robotic ALPPS for Intrahepatic Cholangiocarcinoma
No full textBackground: Associating liver partition and portal vein ligation for staged hepatectomy (ALPPS) for intrahepatic cholangiocarcinoma (ICC) demonstrated good long-term outcomes1 and can increase the rate of resectability in locally advanced ICC;2 however, the rates of postoperative complications (Clavien–Dindo grade III) and mortality range between 13.6 and 44% and 0 and 29%, respectively.3 Minimally invasive strategies may reduce the risk of postoperative morbidity, with the same oncologic outcomes.4,5 We report the first case of full robotic ALPPS for advanced ICC. Methods: The patient was a 61-year-old male diagnosed with a 6.5 cm ICC involving segments IV, V, and VIII. The total clean liver volume was 1553 cc3, with a future liver remnant (FLR) volume of 21.6% (segments I, II, and III: 337 cc3). The procedure was performed by a senior hepato-pancreato-biliary (HPB) surgeon at the robotic console and a junior HPB surgeon at the table side. Results: Computed tomography scan on postoperative day (POD) 9 after stage 1 showed that FLR increased up to 38%. The indocyanine green clearance test showed a plasma disappearance rate of 19.8%/min and a retention rate at 15 min of 5.1%; complete blood tests are available at the end of the video. ALPPS was completed on POD 14, the postoperative course was uneventful, and the patient was discharged in good general condition on POD 5. Final pathology showed a 6 cm ICC, G3, R0 margin (10 mm), T2–N0–M0. The patient started adjuvant capecitabine, and after 6 months was in good general condition without signs of local or systemic recurrence. Conclusions: Robotic ALPPS combines the opportunity to perform a curative resection in patients presenting with insufficient FLR with the advantages of a minimally invasive approach. It is feasible and oncologically accurate for ICC when performed in fully trained HPB centers
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