3 research outputs found
The influence of crack-imbalance orientation and orbital evolution for an extended cracked Jeffcott rotor
Vibration peaks occurring at rational fractions of the fundamental rotating
critical speed, here named Local Resonances, facilitate cracked shaft detection
during machine shut-down. A modified Jeffcott-rotor on journal bearings
accounting for gravity effects and oscillating around nontrivial equilibrium
points is employed. Modal parameter selection allows this linear model to
represent first mode characteristics of real machines. Orbit evolution and
vibration patterns are analyzed, yielding useful results. Crack detection
results indicate that, instead of 1x and 2x components, analysis of the
remaining local resonances should have priority; this is due to crack-residual
imbalance interaction and to 2x multiple induced origins. Therefore, local
resonances and orbital evolution around 1/2, 1/3 and 1/4 of the critical speed
are emphasized for various crack-imbalance orientations
Impact of the first wave of the COVID-19 pandemic on non-COVID inpatient care in southern Spain
We assessed the impact of the first wave of COVID-19 pandemic on non-COVID hospital admissions, non-COVID mortality, factors associated with non-COVID mortality, and changes in the profile of non-COVID patients admitted to hospital. We used the Spanish Minimum Basic Data Set with diagnosis grouped according to the Diagnostic Related Groups. A total of 10,594 patients (3% COVID-19; 97% non-COVID) hospitalised during the first wave in 2020 (27-February/07-June) were compared with those hospitalised within the same dates of 2017-2019 (average annual admissions: 14,037). We found a decrease in non-COVID medical (22%) and surgical (33%) hospitalisations and a 25.7% increase in hospital mortality among non-COVID patients during the first pandemic wave compared to pre-pandemic years. During the officially declared sub-period of excess mortality in the area (17-March/20-April, in-hospital non-COVID mortality was even higher (58.7% higher than the pre-pandemic years). Non-COVID patients hospitalised during the first pandemic wave (compared to pre-pandemic years) were older, more frequently men, with longer hospital stay and increased disease severity. Hospitalisation during the first pandemic wave in 2020, compared to hospitalisation during the pre-pandemic years, was an independent risk factor for non-COVID mortality (HR 1.30, 95% CI 1.07-1.57, p = 0.008), reflecting the negative impact of the pandemic on hospitalised patients
Impact of the first wave of the COVID-19 pandemic on non-COVID inpatient care in southern Spain
Abstract We assessed the impact of the first wave of COVID-19 pandemic on non-COVID hospital admissions, non-COVID mortality, factors associated with non-COVID mortality, and changes in the profile of non-COVID patients admitted to hospital. We used the Spanish Minimum Basic Data Set with diagnosis grouped according to the Diagnostic Related Groups. A total of 10,594 patients (3% COVID-19; 97% non-COVID) hospitalised during the first wave in 2020 (27-February/07-June) were compared with those hospitalised within the same dates of 2017–2019 (average annual admissions: 14,037). We found a decrease in non-COVID medical (22%) and surgical (33%) hospitalisations and a 25.7% increase in hospital mortality among non-COVID patients during the first pandemic wave compared to pre-pandemic years. During the officially declared sub-period of excess mortality in the area (17-March/20-April, in-hospital non-COVID mortality was even higher (58.7% higher than the pre-pandemic years). Non-COVID patients hospitalised during the first pandemic wave (compared to pre-pandemic years) were older, more frequently men, with longer hospital stay and increased disease severity. Hospitalisation during the first pandemic wave in 2020, compared to hospitalisation during the pre-pandemic years, was an independent risk factor for non-COVID mortality (HR 1.30, 95% CI 1.07–1.57, p = 0.008), reflecting the negative impact of the pandemic on hospitalised patients