Performance degradation data obtained from single solid oxide fuel cells, tested at 850 °C with air and humidified H2 and using Ni‐YSZ anode supported cells, are presented here. Microscopic ...investigation is carried out on both anode and cathode to quantify variations in the morphology at different operation times. The comparison between the measurements on the cells and the SEM image analysis allows to conclude that there is no relationship between the initial cell activation and microstructural modifications of the electrodes. On the other hand, it was found that cell degradation is strictly related to the coarsening of Ni particles occurring in the anode. A theoretical analysis based on an electrode micromodel has been performed in order to compare the variation in performance, expected from particle size change, with the observed data. The model confirmed the conclusions of the experimental results.
X-ray nanotomography and focused ion beam scanning electron microscopy (FIB‐SEM) have been applied to investigate the complex 3D microstructure of solid oxide fuel cell (SOFC) electrodes at spatial ...resolutions of 45
nm and below. The application of near edge differential absorption for x-ray nanotomography and energy selected backscatter detection for FIB–SEM enable elemental mapping within the microstructure. Using these methods, non‐destructive 3D x-ray imaging and FIB–SEM serial sectioning have been applied to compare three‐dimensional elemental mapping of the LSM, YSZ, and pore phases in the SOFC cathode microstructure. The microstructural characterization of an SOFC cathode is reported based on these measurements. The results presented demonstrate the viability of x-ray nanotomography as a quantitative characterization technique and provide key insights into the SOFC cathode microstructure.
► Solid oxide fuel cell cathode microstructure is characterized with x-ray nanotomography and FIB-SEM. ► Near edge differential absorption and EsB detection enable elemental mapping of distinct cathode phases (e.g. LSM, YSZ, pore). ► The accuracy of cathode characterization by x-ray nanotomography is confirmed.
X-ray nanotomography and focused ion beam scanning electron microscopy (FIB-SEM) have been applied to investigate the complex 3D microstructure of solid oxide fuel cell (SOFC) electrodes at spatial ...resolutions of 45 nm and below. The application of near edge differential absorption for x-ray nanotomography and energy selected backscatter detection for FIB-SEM enable elemental mapping within the microstructure. Using these methods, non-destructive 3D x-ray imaging and FIB-SEM serial sectioning have been applied to compare three-dimensional elemental mapping of the LSM, YSZ, and pore phases in the SOFC cathode microstructure. The microstructural characterization of an SOFC cathode is reported based on these measurements. The results presented demonstrate the viability of x-ray nanotomography as a quantitative characterization technique and provide key insights into the SOFC cathode microstructure.
Giannina Gaslini Children's Hospital (GGCH) is a tertiary care hospital with an average of 100 new cancer diagnoses made each year. In April 2000, following preliminary analysis of the potential ...benefits, and the results of a questionnaire filled in by the parents attending the out-patient clinic, a Home Care (HC) program was started.
Children in stable, non-critical, clinical conditions requiring i.v. therapy, parenteral nutrition, transfusional support, blood examinations, and central venous catheter use training management, as well as terminally ill children needing palliative and support therapy were considered eligible for the program.
After one year of activity, 45 children, aged 1 month-19 years (median 3 years), requiring i.v. therapy and blood tests in 32 cases, central venous catheter use training in 5, and palliative care in 8, were treated at home. The median duration of assistance for each child was 19 days (range 1-172). An average of 4 patients per week were assisted for a total of 1,364 days. A total of 881 accesses at home replaced 551 and 330 out-patient and in-patient days of hospitalization, respectively. The average cost per patient given home care (2,936 E, range 150-20,700) resulted to be significantly lower than the average cost per patient hospitalized to undergo the same procedures (9,785E, range 350-96,750).
The opportunity to reduce the frequency and duration of hospitalization represents an incalculable advantage for these children and their families. This report shows that home care is a feasible kind of assistance for children suffering from cancer, and reduces costs as well.
The quality of life of patients who undergo haematopoietic stem cell transplantation (HSCT) is affected by long periods of hospitalisation for the treatment of several complications. On this basis, ...28 children who underwent 29 HSCTs were included in the Home Care (HC) programme of the Paediatric Haematology and Oncology Department of the Gaslini Children's Hospital to be discharged earlier. A total of 17 children were assisted for haematologic follow-up and support therapy administration. The remaining children were followed up for graft- versus-host disease and/or cytomegalovirus infection. Overall activity consisted of 1232 i.v. therapies, 501 blood tests, 58 red blood cell or platelet transfusions, 107 procedures on Central Venous Catheter. Median duration of the assistance per child was 25 days (range 1235) for a total of 1598 days. A total of 822 accesses at home replaced 459 and 363 out-patient and in-patient days of hospitalisation. The average cost per patient receiving HC (EUR 4,252) was significantly lower (P<0.01) when compared to the average cost per patient admitted to the hospital to undergo the same procedures (EUR 14,693). This report shows that HC is feasible for children following HSCT, that it reduces the discomfort of the patients and their families, and that it reduces costs.
PDF