1,721,252 research outputs found
IMPLEMENTAZIONE DI TECNICHE DI TERMOGRAFIA ATTIVA IRNDT SU COMPOSITI GRP MEDIANTE LA DEPOSIZIONE DI IMPULSI TERMICI DI LUNGA DURATA
Full text linkNel presente lavoro viene analizzata l’implementazione di tecniche attive di termografia ad infrarossi per analisi NDT su pannelli in composito. In particolare si propone l’uso di lampade alogene come sorgente di calore esterna, le quali richiedono tempi di accensione dell’ordine di diversi secondi al fine di depositare efficaci quantità di calore. Si discutono quindi le problematiche connesse all’implementazione di tecniche di Transient Thermography e di Lock-In Thermography in presenza di tempi lunghi di deposizione di calore. Viene implementata una tecnica di modulazione della deposizione di calore mediante treni di onde quadre di lunga durata (PMLT - Pulse Modulated Lock-In Thermography). Viene in particolare analizzata l’influenza del periodo dell’onda quadra, e del rapporto di acceso-spento del treno di onde quadre, attraverso l’analisi dell’andamento del contrasto di fase al variare della frequenza di correlazione (lock-in frequency)
Thermal NDT of glass reinforced composite panels for naval applications by means of a linear infrared scanner
No full textThe work describes the development and application of a low cost Thermal NDT set-up to investigate the influence of delamination defects on thick glass fibre reinforced composite laminates simulating typical hull monolithic GRP panels. Two active thermographic techniques have been implemented in particular: a pulsed thermography and a step heating scheme. A 12 mm thick cross-ply panel has been manufactured and delamination defects simulated in two different ways: by embedding patches of folded Teflon sheets, and by drilling flat bottomed back holes. A number of defects was then positioned at three different depths form the scanned surfaces, measuring 1⁄4, 1⁄2 and 3⁄4 of the laminate thickness. A reflection set-up was adopted, with an external heat source consisting of 1500 W halogen lamps. Results have evidenced the possibility to use the proposed cheap thermographic set-up, suitable to operate also in boatyard environments, to detected non-visible delamination type defects in thick GRP laminate skins. A fine tuning of the operational parameters is though essential in order to better identify defects features and to discern the influence of other factors such as surface finish
To prevent the allergic disease: The dream of the allergist
No full textAllergen avoidance, allergen immunotherapy, IgE antagonists, biological medications, prevention and treatment of respiratory infections, probiotics, adapted formula, vitamins, and oligo-elements have been investigated as strategies in the prevention of allergic diseases. Promising findings were obtained. To prevent allergic diseases could be a dream that will be soon realized in clinical practice. (www.actabiomedica.it)
A polycentric, randomized, double blind, parallel-group, placebo-controlled study on Lertal®, a multicomponent nutraceutical, as add-on treatment in children with allergic rhinoconjunctivitis: phase I during active treatment
No full textAllergic rhinoconjunctivitis (AR) treatment is usually pharmacological in children, but medications are merely symptomatic, may not be completely effective, and may have relevant side effects. Thus, doctors and parents look at complementary medicine, including nutraceuticals. Lertal®, an oral nutraceutical, contains extract of Perilla, quercetin, and Vitamin D3 It has been reported that adults with AR diminished allergic symptoms and medication use during Lertal® therapy. Therefore, the current polycentric, randomized, double blind, parallel-group, placebo-controlled study aimed to evaluate the efficacy and safety of Lertal® as an add-on treatment in children with AR. In this study, 146 children (94 males and 52 females, mean age 9.1±1.88) were randomly assigned to Lertal® + standard treatment or Placebo + standard treatment and were visited at baseline (W0), and after 2 (W2) and 4 weeks (W4). Standard treatment consisted of continuous antihistaminic schedule. The primary endpoint was the Total Symptom Score (TSS - last 12 hours) change from the baseline to the end of the 4-week treatment. Both groups significantly (p less 0.0001 for both) reduced TSS (last 12 hours) after 4 weeks (% change: - 63.6% in Lertal®-group and - 60.7% in Placebo-group; p= n.s. intergroup analysis). Notably, 24 children had symptom worsening between W2 and W4: 8 in the Lertal®-group and 16 in the Placebo-group, with significant intergroup difference (p less than 0.05). All of them were poly-allergic subjects exposed to multiple allergens. There was no relevant adverse event. The present study documented that Lertal®, as add-on treatment, was able to significantly prevent the occurrence of clinical worsening and was safe in AR poly-allergic children
The relevance of symptom perception in the management of severe asthma in adolescents
No full textSevere asthma is a compelling challenge in clinical practice. Adolescence represents a relevant aspect of this issue. We report a series of adolescents with severe asthma and evaluated before and after a one-year standardized guideline-oriented treatment. We explored the relevance of symptom perception, including nasal and bronchial complaints, assessed by visual analog scale (VAS) and the perception of asthma control measured by the asthma control test (ACT). The current study demonstrated that adolescents perceived a significant improvement in their symptoms (p < 0.0001) and asthma control (p < 0.001) after adequate treatment. In conclusion, the management of severe asthma in adolescents should be carefully addressed to also consider the patient's perception
Digital health interventions in children with asthma
No full textAlthough healthcare providers are actively involved in offering education, information and interventions for asthmatic patients, medication and therapeutic adherence remain low in the paediatric population, with estimates suggesting that adherence rates hover below 50%. A range of available digital health interventions has been explored in paediatric asthma with promising but variable results, limiting their widespread adoption in clinical practice. They include emerging technologies that yield the advantage of tracking asthma symptoms and medications, setting drug reminders, improving inhaler technique and delivering asthma education, such as serious games (video games designed for medical- or health-related purposes), electronic monitoring devices, speech recognition calls, text messaging, mobile apps and interactive websites. Some of the proposed digital interventions have used multiple components, including educational and behavioural strategies and interactions with medical professionals. Overall, the implementation of such interventions may offer the opportunity to improve adherence and asthma control. In a state of emergency as the COVID-19 pandemic, telemedicine can also play a central role in supporting physicians in managing children with asthma. This review evaluates the published literature examining digital health interventions for paediatric asthma and explores the most relevant issues affecting their implementation in practice and the associated evidence gaps, research limitations and future research perspectives
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