Search results for "taz"

Absorption kinetics and swelling stresses in hydrothermally aged epoxies investigated by photoelastic image analysis

2015

Abstract The present work proposes an experimental optical methodology able to measure the transient swelling stresses induced by the water uptake ageing of polymers. In particular, the work describes the implementation of a Photoelastic technique to quantify internal stresses arising during the hydrothermal ageing of cast epoxy samples. The material investigated is a model DGEBA/DDS epoxy system. Curing and post-curing cycles have been optimised in order to obtain a fully cured, high T g , and completely stress free initial condition. Rectangular beam samples were then left in a hydrothermal bath at 90 °C, and regularly monitored by gravimetric and photoelastic analyses. The quantitative e…

Accordo e disaccordo: prospettive logico-retoriche

2012

Da ormai più di 50 anni la teoria dell’argomentazione ha acquisito un ruolo centrale nell’ambito della riflessione filosofico-linguistica. A far data dal 1958, anno in cui escono in contemporanea ma in maniera del tutto indipendente, il Trattato dell’argomentazione di Perelman ed Olbrechts-Tyteca e Gli usi dell’argomentazione di S. Toulmin si è assistito, infatti, ad una serrata rivalutazione di una logica del ragionamento che, in opposizione alla logica dimostrativa di matrice cartesiana, recupera la centralità delle nozioni di efficacia, di probabile, di uditorio. Una logica doxastica, dunque, che, per riprendere la terminologia impiegata da Aristotele, si applica a ciò che, essendo vero …

ChemInform Abstract: Synthesis and Pharmacological Activities of Novel 3-(Isoxazol-3-yl)-quinazolin-4(3H)-one Derivatives.

2010

Several new 3-(isoxazol-3-yl)-quinazolin-4(3H)-one derivatives were synthesized and tested for their analgesic and antiinflammatory activities, as well as for their acute toxicity and ulcerogenic effect. A few compounds were as active as phenylbutazone in the writhing and acetic acid peritonitis tests. They had a very low ulcerogenic effect.

ChemInform Abstract: Reaction of 4-Acylaminomethylpyridine N-Oxides with Phenylbutazone in the Presence of Acetic Anhydride.

1988

Nuovo siero con vitamina C levogira stabilizzato con melatonina e resveratrolo. Prove di stabilità e uso clinico

2012

Nuovo siero con vitamina C levogira stabilizzato con melatonina e resveratrolo. Prove di stabilità e uso clinico Matteo Tutino, Giuseppe Morici, L. Cavarra, Francesco Nanfitò, D. Camacaro, Vittorio Calabrese. Università di Palermo, Dipartimento di Biomedicina sperimentale e neuroscienze cliniche - Università di Catania, Dipartimento Biochimica Clinica Fino ad ora è stato difficile utilizzare la vitamina C nelle preparazioni cosmetiche a causa della sua instabilità. L’acido ascorbico infatti si ossida velocemente in seguito all’esposizione alla luce, alla temperatura e all’aria. In questo lavoro viene riportata la capacità della melatonina e del resveratrolo a stabilizzare la vitamina C levo…

Drug resistance patterns of bacteria isolated from patients with nosocomial pneumonia at Tehran hospitals during 2009-2011

2013

Introduction: Nosocomial pneumonia remains an important cause of mortality and morbidity worldwide. Surveillance programs play an important role in the identification of common etiologic agents and local patterns of antimicrobial resistance. Methodology: In this study we determined the frequency and antimicrobial susceptibility of pathogens isolated from patients with nosocomial pneumonia during 2009 to 2011. Results: A total of 642 bacteria were isolated from 516 suspected samples. Acinetobacter baumannii (21.1%, n = 136), was the commonest isolated pathogen followed by Pseudomonas aeruginosa (17.4%, n = 112) , Staphylococcus aureus (15.8%, n = 102) and enterococci (8.4% n = 54). The most …

A radiometric and petrographic approach to risk assessment at Alte Madonie Mounts region (Sicily, Italy)

2013

The main goal of this work was to assess the radiological hazard at Alte Madonie Mounts region (north-central Sicily, Italy) in response to rumours of an increase in the incidence of cancer in this area. A correlation between the natural radionuclide contents and the petrographic features of the soil and rock samples was also evaluated. A total of 41 samples of selected soils and rocks were collected, powdered, dried and sealed in 'Marinelli' beakers for 20 d prior to measurement to ensure that a radioactive equilibrium between (226)Ra and (214)Bi had been reached. A gamma-ray spectrometer was used to quantify the radioactivity concentrations. To determine (238)U and (232)Th activities, the…

Burkholderia cepacia septicemia in a patient with acute myeloid leukemia in postchemotherapy bone marrow aplasia

2013

The patients with hematologic malignancies are predisposed to develop infections with unusual bacteria, like Burkholderia cepacia, which is frequently resistant to many antibiotics and antiseptics. We present the case of a female patient with acute myeloid leukemia type 2 on the background of myelodysplastic syndrome, from whom Burkholderia cepacia was isolated in blood culture, after the 2(nd) cycle of induction. She was sensitive to ceftazidime, but its eradication was not easy. Five other patients were contaminated with this bacteria, but all of them had favourable evolution. The case is discussed in the context of those similar in literature.

Frontiere pericolose: l'adattamento

2011

I discorsi sull’adattamento ruotano incessantemente intorno a una serie di inossidabili luoghi comuni: ai poli estremi le illusioni fantastiche dei lettori delusi e la programmatica indifferenza dei cinefili irriducibili. La teoria dovrebbe opporsi tenacemente al senso comune ma si è impantanata nel gergo e nell’autoreferenzialità: gli studiosi si leggono tra loro, si posizionano e riposizionano, modificano e aggiornano le loro griglie tassonomiche – quasi sempre triadiche – impegnati a ridefinire all’infinito il continuum che va dalla fedeltà all’originalità. Ai singoli adattamenti chiedono solo la gentilezza di accomodarsi nei relativi scomparti. E poco male se tutto ciò serve solo per or…

Numerical simulations demonstrate that the double tapering of the spatualae of lizards and insects maximize both detachment resistance and stability

2011

Many biological attachment devices of insects, spiders and geckos consist of arrays of hairs (setae), which are terminated by contact elements of different shapes. However, the most frequently observed shape is a thin plate-like spatula. In spite of a rather wide range of sizes, most spatulae of different animals are not uniform, but rather possess a gradient in thickness and width. Here we show that the spatulae of insects and geckos become gradually thinner and wider approaching the end. This geometrical effect is explained in the present paper, by using a numerical approach for the modelling of the van der Waals adhesion and friction between the contact elements and the substrate. The ap…