IRIS Università degli Studi dell'Aquila
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ANALYSIS OF RESISTANCE OF ORTHODONTIC COMPONENTS TO MOUTHWASHES, DISINFECTANTS AND STERILIZER: AN IN VITRO STUDY
No full textBackground: The application of fixed orthodontic appliances plays a crucial role in altering the oral biofilm, exposing patients to an increased risk of caries and periodontal diseases. For this reason, the literature consistently recommends the use of chlorhexidine and fluoride containing mouthwashes as adjuncts to routine oral hygiene practices. Furthermore, it is known that orthodontic appliance components are not sterile when removed from their packaging and should therefore undergo disinfection and sterilization before use. Aim: To evaluate whether commercially available mouthwashes, disinfectants and sterilizers can damage orthodontic components through analysis using scanning electron microscopy (SEM). Materials and Methods: Four commonly used components of fixed appliances were examined: brackets, Ni-Ti arch, metal ligatures and elastic ligatures. The substances tested for their effects on these components included two mouthwashes, two disinfectants, and one sterilizer. Each component was analyzed via SEM at two time points: T0, when untreated, and T2, after immersion in the respective solution for its designated action time, depending on intraoral and extraoral use. Results: The correlation analysis revealed no dependence of the KM width on the age and gender of patients and the type of teeth and jaws. The results indicated that the tested mouthwashes did not cause surface damage to the orthodontic components. Regarding the disinfectant and sterilizer, no surface damage was observed on brackets, arch, or metal ligatures; however, one disinfectant and the sterilizer caused noticeable surface deterioration of the elastic ligatures. During the year of follow-up, there were no dental implant failures in both groups, and the survival rate of implants one year after their installation was 100%. Conclusion: Metal alloy components (stainless steel and nickel – titanium) were not affected in vitro by either the disinfectants/sterilizers or the mouthwashes. Therefore, these substances can be used safely and comply with the healthcare professional’s obligation to maintain patient health. However, caution should be exercised in disinfecting elastic ligatures. Mouthwashes and chlorhexidine-based disinfectants were shown to have no damaging effects on elastic ligatures and can thus be safely employed for these components
Nano and microplastics (NMPS) impair meiosis and alter the redox state of the mouse female germ cell
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Cephalalgia reports: Advancing science while bridging global disparities in headache research and care
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La conversione dell’energia termica persa nei motori a combustione interna in energia meccanica
Get PDFFrom 2030, emissions from new passenger cars in the European Union will have to be below 49,5 gCO2/km and those from new light commercial vehicles 90,6 gCO2/km. Although electrification is the best way to decarbonize road transport, improving conventional engine technologies is also useful in the transition process. One technology that can improve efficiency and reduce fuel consumption of a conventional thermal engine is the recovery of thermal energy usually lost and its transformation into mechanical energy. This is particularly challenging considering that the share of fossil fuels corresponding to the thermal energy lost is of the order of 60%, significantly greater than that useful for propulsion.
This thesis studied the potential benefits of two recovery technologies: Organic Rankine Cycle (ORC) plants and turbo-compound.
For ORC technology, a numerical model was developed to simulate the dynamic behavior of the evaporator, on which the dynamics of the plant depend to a greater extent. The model can be used to develop a control system for the ORC unit. An experimental campaign was conducted on a small-scale ORC plant whose upper thermal source's maximum temperature is comparable to the engine coolant temperature. The performance of two plant configurations was compared considering or not a regeneration stage. At the same working fluid flow rate, the power obtained by the expander in the unit with a regenerator is higher, because the degree of superheating and the maximum temperature in the cycle (and pressure) are higher. In addition, the efficiency of the unit with a regenerator is higher throughout the mass flow rate range considered, because the working fluid arrives preheated in the evaporator: at 40 g/s, the efficiency is 5 percent for the unit with a regenerator and 4 percent for the one without. The system performance with two different types of expanders was also compared: a scroll expander and an SVRE expander. The power output of the system varies between 100 and 500 W in the case of the scroll expander, and between 200 and 700 W in the case of the SVRE expander. The efficiency varies between 2% and 6% in the case of the SVRE expander; between 2% and 4%, in the case of the scroll expander.
The second recovery technology was based on a direct recovery via a turbo-compounding system. A numerical model was developed to evaluate the potential benefits of installing a power turbine downstream of a turbocharger to further recovery in terms of pressure ratio (and temperature). The model considers an F1C IVECO turbocharged 3L Diesel engine operated on a high-speed dynamic test bench. According to the results obtained from the model, for high engine loads and speeds, the recovered power can be as high as 18 kW; for lower loads, it can be as low as about 4-5 kW. Considering the combined effects of the increase in specific fuel consumption and the increase in power, a reduction in fuel consumption of 8% is obtained when the engine speed is above 3400 rpm. These data were based on an extensive measurement campaign done on the cited engine which characterized all the variables in input to the turbo-compounding system
Il turismo di massa “come ornamento” nella prospettiva critica di Siegfried Kracauer. Con due brevi focus cinematografici.
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Территории итальянского театра
No full textВступление написано в соавторстве, каждый из авторов куриро- вал отдельные его части: Дориана Ледже — «За пределами мест», «Театр, состоящий из актрис и актеров», «Читая театр»; Габриэле София — «Территории», «Ошибаться тоже нужно», «Театр в контр- культурных пространствах», «Текст и тело», «До чего же уныло бла- горазумие», «Примечание для российских читателей»
Automatic Detection of Whistler Waves in the Top-Side Ionosphere: The WhISPER Technique
Get PDFWe introduce the Whistler Identification by Spectral Power Estimation and Recognition
(WhISPER) algorithm, a novel automated technique for detecting whistler waves in
the top side of the Earth’s ionosphere. WhISPER is the first step towards a comprehensive
system designed to accumulate and analyze a large dataset of whistler observations, which
has been developed to advance our understanding of whistler generation and propagation.
Unlike conventional image-correlation-based techniques, WhISPER identifies whistlers
based on their energy content, enhancing computational efficiency. This work presents the
results of applying WhISPER to four years (2019–2022) of top-side ionospheric magnetic
field data. A statistical analysis of over 800,000 detected whistlers reveals a strong correlation
with lightning activity and (as expected) higher occurrence rates during local summer
months. The presented results demonstrate the excellent performance of the WhISPER
technique in identifying whistler events