Publications by authors named "D Zappa"
In this work, the gas sensing properties of a single ZnO nanowire (NW) are investigated, simultaneously in terms of photoluminescence (PL) and photocurrent (PC) response to NO gas, with the purpose of giving new insights on the gas sensing mechanism of a single 1D ZnO nanostructure. A single ZnO NW sensing device was fabricated, characterized, and compared with a sample made of bundles of ZnO NWs. UV near-band-edge PL emission spectroscopy was carried out at room temperature and by lowering the temperature down to 77 K, which allows detection of resolved PL peaks related to different excitonic transition regions.
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- Light and active mobility, along with multimodal transportation, can play a vital role in reducing carbon emissions and improving air quality, which is essential for health and leisure.
- The integration of low-cost, compact embedded systems like the BME688 sensor, used in wearables and solar-powered charging stations, helps create a distributed network to monitor air quality in real-time.
- Initial experiments indicate that the BME688 is effective in assessing air quality, although factors like humidity significantly affect its readings, particularly in uncontrolled outdoor environments.
Accurate hydrogen leakage detection is a major requirement for the safe and widespread integration of this fuel in modern energy production devices, such as fuel cells. Quasi-1D nanowires of seven different metal oxides (CuO, WO, Nb-added WO, SnO, ZnO, α-BiO, NiO) were integrated into a conductometric sensor array to evaluate the hydrogen-sensing performances in the presence of interfering gaseous compounds, namely carbon monoxide, nitrogen dioxide, methane, acetone, and ethanol, at different operating temperatures (200-400 °C). Principal component analysis (PCA) was applied to data extracted from the array, demonstrating the ability to discriminate hydrogen over other interferent compounds.
View Article and Find Full Text PDFTitanium dioxide nanobelts were prepared via the alkali-hydrothermal method for application in chemical gas sensing. The formation process of TiO-(B) nanobelts and their sensing properties were investigated in detail. FE-SEM was used to study the surface of the obtained structures.
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- Acute flaccid myelitis (AFM) is a rare but serious illness that can lead to death or long-term complications, primarily affecting children, with cases often clustering in late summer and early fall.
- Since 2012, AFM has been under CDC surveillance, with thousands of confirmed cases worldwide, and many pediatric patients requiring hospitalization and potential intubation due to respiratory issues.
- The educational session aims to prepare emergency medicine residents and medical students to handle pediatric cases of AFM by teaching them to collect medical histories, perform neurological exams, differentiate diagnoses, and communicate effectively with families.