Coronavirus disease 2019(COVID-19)has spread throughout China.However,information about COVID-19 in cities and regions outside Wuhan is limited and the indicators that predict the length of hospital stay for patients ...Coronavirus disease 2019(COVID-19)has spread throughout China.However,information about COVID-19 in cities and regions outside Wuhan is limited and the indicators that predict the length of hospital stay for patients with COVID-19 are unclear.Therefore,we collected clinical data from 47 patients with COVID-19 in Quanzhou City.The median age was 38 years[interquartile range(IQR):31–50 years],and 24(51%)were male.There were 8 mild,36 moderate,and 3 severe/critical cases.The median interval from exposure to disease onset was 13 days(IQR:8–18 days).The incidence of severe/critical cases was 33%(3/10)in patients with hypertension.Common symptoms included fever(83%),cough(77%),fatigue(40%),a sore,dry throat(28%),and diarrhea(21%).One patient(2%)developed respiratory distress syndrome on day 13 of inpatient treatment.Six patients had leukopenia,17 had elevated C-reactive protein(CRP),and 8 had lymphocytopenia and elevated lactate dehydrogenase(LDH).The median length of hospitalization was 22 days(IQR:16-30 days).Dynamic monitoring of LDH,CRP,and neutrophil-lymphocyte ratio predicted whether length of hospitalization would exceed 21 days.Most patients presented with mild and moderate disease.Patients with hypertension were more likely to become severe or critical.Dynamic monitoring of LDH,CRP,and neutrophil-lymphocyte ratio levels can help predict delayed discharge from the hospital.展开更多
Corrosion resistance and delayed action are major obstacles that severely limit the practical application of Mg alloy in battery fields. In this work, the effects of Na2SiO3 on the electrochemical behavior of the AZ31...Corrosion resistance and delayed action are major obstacles that severely limit the practical application of Mg alloy in battery fields. In this work, the effects of Na2SiO3 on the electrochemical behavior of the AZ31B Mg alloy in MgSO4-Mg(NO3)2 composite solution[0.14 mol/L MgSO4,1.86 mol/L Mg(NO3)2] were investigated. Electrochemical tests were carried out using electrochemical impedance spectroscopy, galvanostatic discharge, and linear sweep voltammograms. The results indicate that the impedance value increases by nearly fourfold, and the delayed time decreases from 2.1 s to 0.6s. Battery perfoniiance test reveals that the addition of Na2SiO3 significantly improves the discharge specific capacity of Mg-MnO2. The surface morphology and composition of corrosion products from Mg alloys were studied by scanning electron microscopy(SEM) and Fourier translonn infrared spectroscopy(FTIR), respectively. The SEM images of the AZ31B Mg alloys in composite solution with or without Na2SiO3 additive have an evident distinction due to the ionnation of new insoluble compound.FTIR result confirms that the corrosion products accumulated on the alloy surface in the electrolyte containing Na2SiO3 are mainly composed of Mg(OH)2, MgCO3, and MgSiO3.展开更多
基金the Natural Science Foundation of China(81400625)Natural Science Foundation of Fujian Province(2019J01593,2017J01228)+2 种基金High-Level Talent Innovation Project of Quanzhou(2018C067R)Science and Technology Innovation Project of Fujian Province(2019Y9048)Pilot Project of Fujian Provincial Department of Science&Technology(2020Y0005)。
文摘Coronavirus disease 2019(COVID-19)has spread throughout China.However,information about COVID-19 in cities and regions outside Wuhan is limited and the indicators that predict the length of hospital stay for patients with COVID-19 are unclear.Therefore,we collected clinical data from 47 patients with COVID-19 in Quanzhou City.The median age was 38 years[interquartile range(IQR):31–50 years],and 24(51%)were male.There were 8 mild,36 moderate,and 3 severe/critical cases.The median interval from exposure to disease onset was 13 days(IQR:8–18 days).The incidence of severe/critical cases was 33%(3/10)in patients with hypertension.Common symptoms included fever(83%),cough(77%),fatigue(40%),a sore,dry throat(28%),and diarrhea(21%).One patient(2%)developed respiratory distress syndrome on day 13 of inpatient treatment.Six patients had leukopenia,17 had elevated C-reactive protein(CRP),and 8 had lymphocytopenia and elevated lactate dehydrogenase(LDH).The median length of hospitalization was 22 days(IQR:16-30 days).Dynamic monitoring of LDH,CRP,and neutrophil-lymphocyte ratio predicted whether length of hospitalization would exceed 21 days.Most patients presented with mild and moderate disease.Patients with hypertension were more likely to become severe or critical.Dynamic monitoring of LDH,CRP,and neutrophil-lymphocyte ratio levels can help predict delayed discharge from the hospital.
文摘Corrosion resistance and delayed action are major obstacles that severely limit the practical application of Mg alloy in battery fields. In this work, the effects of Na2SiO3 on the electrochemical behavior of the AZ31B Mg alloy in MgSO4-Mg(NO3)2 composite solution[0.14 mol/L MgSO4,1.86 mol/L Mg(NO3)2] were investigated. Electrochemical tests were carried out using electrochemical impedance spectroscopy, galvanostatic discharge, and linear sweep voltammograms. The results indicate that the impedance value increases by nearly fourfold, and the delayed time decreases from 2.1 s to 0.6s. Battery perfoniiance test reveals that the addition of Na2SiO3 significantly improves the discharge specific capacity of Mg-MnO2. The surface morphology and composition of corrosion products from Mg alloys were studied by scanning electron microscopy(SEM) and Fourier translonn infrared spectroscopy(FTIR), respectively. The SEM images of the AZ31B Mg alloys in composite solution with or without Na2SiO3 additive have an evident distinction due to the ionnation of new insoluble compound.FTIR result confirms that the corrosion products accumulated on the alloy surface in the electrolyte containing Na2SiO3 are mainly composed of Mg(OH)2, MgCO3, and MgSiO3.