The development of Fe_(3)O_(4) in the fields of electromagnetic wave absorption(EMA)is severely hindered by its narrow bandwidth and environmental tolerance.Herein,we introduce dielectric components and favorable hete...The development of Fe_(3)O_(4) in the fields of electromagnetic wave absorption(EMA)is severely hindered by its narrow bandwidth and environmental tolerance.Herein,we introduce dielectric components and favorable hetero-interface engineering on Fe_(3)O_(4) to promote the EMA and broaden the effective absorption bandwidth(EAB).Before incorporation of dielectric components,Fe_(3)O_(4) microspheres show a high-effective EMA in C and X bands with the strongest reflection loss(RL)of 70.40 dB at 8.86 GHz and a corresponding EAB of 5.3 GHz(5.3−10.6 GHz).Upon the introduction of dielectric SiO2 or TiO2 coating,the tailored permittivity and the enhanced dielectric loss are obtained by reinforcing the interface polarization.Meanwhile,the structural feature imparts desirable impedance matching and multiple reflection and scattering absorption.As a result,Fe_(3)O_(4)@SiO2 exhibits outstanding EMA performances in C,X,and Ku bands,including an impressive EAB of 6.5 GHz(11.5-18.0 GHz)covering the whole Ku band with only 2.5 mm.Fe_(3)O_(4)@TiO2 achieves a broaden EAB of 8.4 GHz with 3.0 mm,which is better than those of many Fe_(3)O_(4)-based absorbers previously reported.More importantly,both SiO2 and TiO2 coating efficiently enhance the marine anticorrosion properties of Fe_(3)O_(4),making it a superior EMA material with strong and wide absorbing features for EMA application.展开更多
Activation pretreatment of Cr-containing limonitic laterite ores by NaOH roasting to remove Cr, Al, and Si, as well as its effect on Ni and Co extraction in the subsequent pressure acid leaching process was investigat...Activation pretreatment of Cr-containing limonitic laterite ores by NaOH roasting to remove Cr, Al, and Si, as well as its effect on Ni and Co extraction in the subsequent pressure acid leaching process was investigated. Characterization results of X-ray diffraction （XRD） and scanning electron microscopy/X-ray energy dispersive spectroscopy （SEM/XEDS） show that goethite is the major Ni-bearing mineral, and chromite is the minor one. Experimental results show that the leaching rates of Cr, Al, and Si are 95.6wt%, 83.8wt%, and 40.1wt%, respectively, under the optimal alkali-roasting conditions. Compared with the direct pressure acid leaching of laterite ores, the leaching rates of Ni and Co increase from 80.1wt% to 96.9wt% and 70.2wt% to 95.1wt% after pretreatment, respectively. Meanwhile, the grade of acid leaching iron residues increases from 54.4wt% to 62.5wt%, and these residues with low Cr content are more suitable raw materials for iron making.展开更多
Objective:To explore the plasma endothelium inhibition and type 2 diabetes mellitus patients with Diabetic Nephropathy the correlation between risk and its predictive value.Methods:From January 2015 to January 2017, 2...Objective:To explore the plasma endothelium inhibition and type 2 diabetes mellitus patients with Diabetic Nephropathy the correlation between risk and its predictive value.Methods:From January 2015 to January 2017, 202 cases of type 2 diabetes mellitus patients diagnosed and treated in our hospital were selected and divided into observation group and control group according to DN occurrence during follow-up, general data and blood biochemical indexes before treatment were compared between the two groups, Logistic regression was used to analyze independent risk factors of DN, and ROC curve was used to evaluate the predictive effectiveness of different indicators on DN occurrence.Results: A total of 35 developed DN In this study. The mean arterial pressure, HbA1c, UACR and endostatin in observation group were significantly higher than control group, GFR in observation group was significantly lower than control group, multivariate Logistic regression showed that GFR was an independent protective factor for DN, and HbA1c, UACR and endostatin were independent risk factors for DN, The best cut-off point for endostatin prediction of DN occurrence was 43.29 ng/mL, and the AUC was 0.890, significantly better than GFR, HbA1c and UACR, the sensitivity was 85.71%, significantly better than other indicators.Conclusions: Endostatin was significantly associated with DN risk in patients with type 2 diabetes mellitus and had good predictive efficacy.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52403356)the Natural Science Foundation of Liaoning Province(No.2024-MS-128)+1 种基金the Basic Research Project Educational Department of Liaoning Province(No.JYTQN2023367)Shenyang University of Chemical and Technology of"Outstanding youth"plan Funds(No.2022YQ002).
文摘The development of Fe_(3)O_(4) in the fields of electromagnetic wave absorption(EMA)is severely hindered by its narrow bandwidth and environmental tolerance.Herein,we introduce dielectric components and favorable hetero-interface engineering on Fe_(3)O_(4) to promote the EMA and broaden the effective absorption bandwidth(EAB).Before incorporation of dielectric components,Fe_(3)O_(4) microspheres show a high-effective EMA in C and X bands with the strongest reflection loss(RL)of 70.40 dB at 8.86 GHz and a corresponding EAB of 5.3 GHz(5.3−10.6 GHz).Upon the introduction of dielectric SiO2 or TiO2 coating,the tailored permittivity and the enhanced dielectric loss are obtained by reinforcing the interface polarization.Meanwhile,the structural feature imparts desirable impedance matching and multiple reflection and scattering absorption.As a result,Fe_(3)O_(4)@SiO2 exhibits outstanding EMA performances in C,X,and Ku bands,including an impressive EAB of 6.5 GHz(11.5-18.0 GHz)covering the whole Ku band with only 2.5 mm.Fe_(3)O_(4)@TiO2 achieves a broaden EAB of 8.4 GHz with 3.0 mm,which is better than those of many Fe_(3)O_(4)-based absorbers previously reported.More importantly,both SiO2 and TiO2 coating efficiently enhance the marine anticorrosion properties of Fe_(3)O_(4),making it a superior EMA material with strong and wide absorbing features for EMA application.
基金supported by the National Key Technology R&D Program (No.2011BAC06B07)
文摘Activation pretreatment of Cr-containing limonitic laterite ores by NaOH roasting to remove Cr, Al, and Si, as well as its effect on Ni and Co extraction in the subsequent pressure acid leaching process was investigated. Characterization results of X-ray diffraction （XRD） and scanning electron microscopy/X-ray energy dispersive spectroscopy （SEM/XEDS） show that goethite is the major Ni-bearing mineral, and chromite is the minor one. Experimental results show that the leaching rates of Cr, Al, and Si are 95.6wt%, 83.8wt%, and 40.1wt%, respectively, under the optimal alkali-roasting conditions. Compared with the direct pressure acid leaching of laterite ores, the leaching rates of Ni and Co increase from 80.1wt% to 96.9wt% and 70.2wt% to 95.1wt% after pretreatment, respectively. Meanwhile, the grade of acid leaching iron residues increases from 54.4wt% to 62.5wt%, and these residues with low Cr content are more suitable raw materials for iron making.
文摘Objective:To explore the plasma endothelium inhibition and type 2 diabetes mellitus patients with Diabetic Nephropathy the correlation between risk and its predictive value.Methods:From January 2015 to January 2017, 202 cases of type 2 diabetes mellitus patients diagnosed and treated in our hospital were selected and divided into observation group and control group according to DN occurrence during follow-up, general data and blood biochemical indexes before treatment were compared between the two groups, Logistic regression was used to analyze independent risk factors of DN, and ROC curve was used to evaluate the predictive effectiveness of different indicators on DN occurrence.Results: A total of 35 developed DN In this study. The mean arterial pressure, HbA1c, UACR and endostatin in observation group were significantly higher than control group, GFR in observation group was significantly lower than control group, multivariate Logistic regression showed that GFR was an independent protective factor for DN, and HbA1c, UACR and endostatin were independent risk factors for DN, The best cut-off point for endostatin prediction of DN occurrence was 43.29 ng/mL, and the AUC was 0.890, significantly better than GFR, HbA1c and UACR, the sensitivity was 85.71%, significantly better than other indicators.Conclusions: Endostatin was significantly associated with DN risk in patients with type 2 diabetes mellitus and had good predictive efficacy.
