Reduction behavior of preoxidized synthetic ilmenite was studied by means of Mossbauer spectra. In the course of reduction, iron component in the samples is reduced in stepwise: Fe 3+ →Fe 2+ →Fe 0, and some...Reduction behavior of preoxidized synthetic ilmenite was studied by means of Mossbauer spectra. In the course of reduction, iron component in the samples is reduced in stepwise: Fe 3+ →Fe 2+ →Fe 0, and some intermediate compounds, such as Fe 3O 4, Fe 2TiO 4 etc . and their solid solution may be generated besides Fe 2O 3 and FeTiO 3. If the reduction temperature is higher than 1173 K, the metallization needs only half time of the case when the temperature is lower than 1073 K.展开更多
An Fe-based nanocrystalline alloy powder is important for application in microwave absorption,and the particle size has a critical impact on the electromagnetic microwave parameters.Therefore,it is necessary to study ...An Fe-based nanocrystalline alloy powder is important for application in microwave absorption,and the particle size has a critical impact on the electromagnetic microwave parameters.Therefore,it is necessary to study further the effects of the particle size on such parameters and improve the microwave absorption performance of Febased nanocrystalline powers.In this study,Fe-B-P particles were prepared through a synthetic approach consisting of an aqueous chemical reduction and a ball milling treatment.We investigated the effects of ball milling on the microstructure and electromagnetic properties of Fe-B-P particles.The experimental results indicate that the Fe-B-P particles synthesized through an aqueous chemical reduction are amorphous spheres.Fe-B-P particles with an original particle size of 200-1200 nm can be milled into an irregular shape with the size reduced to\500 nm after 0.5 h of ball milling,and subsequently,the particles become smaller with increases in the milling time,with traces of Fe2O3 generated on the particle surface.The results of the Mo¨ssbauer spectra show that a portion of the small particles demonstrate a superparamagnetic property.The volume proportions of the superparamagnetic component increase from 13.1 to 15.8%as the treatment time increases.We measured the permittivity and permeability spectra of Fe-B-P particles within the frequency range of 2-18 GHz.The reflection loss(RL)is-10 dB for an absorber thickness of 1.7-5.0 mm.The RL is-20 dB for an absorber thickness of 1.9-2.7 mm.The microwave absorption properties of samples with the same thickness are improved with an increase in the treatment time and are shifted to a higher frequency,which will broaden the bandwidth of the absorption as well.展开更多
Red blood cells (RBC) of the patients with cirrhosis and with primary liver cancer were studied by using Mossbauer spectroscopy. The measurements of RBC from normal adults were made as control. Results showed that the...Red blood cells (RBC) of the patients with cirrhosis and with primary liver cancer were studied by using Mossbauer spectroscopy. The measurements of RBC from normal adults were made as control. Results showed that the subspectrum representing deoxy-Hb either disappeared or diminished, but no other subspectrum was detected in the samples from the patients. In addition, the immune function of RBC of these two types of patients was measured by using immune-adherence haemagglutination (IAHA), which indicated that its immune function was significantly lower than that of normal adults (P【0.01). These experimental results showed that the components of hemoglobin in RBC are correlated with the immune function of RBC.展开更多
About 100 crude Chinese mineral drug samples were investigated with M&’ssbauer spectroscopy, X-ray diffraction analysis and atomic absorption spectroscopy. The classifications, species and components of Chinese m...About 100 crude Chinese mineral drug samples were investigated with M&’ssbauer spectroscopy, X-ray diffraction analysis and atomic absorption spectroscopy. The classifications, species and components of Chinese mineral drugs are elucidated. The pharmaceutic and curative mechanisms of these mineral drugs are discussed.展开更多
文摘Reduction behavior of preoxidized synthetic ilmenite was studied by means of Mossbauer spectra. In the course of reduction, iron component in the samples is reduced in stepwise: Fe 3+ →Fe 2+ →Fe 0, and some intermediate compounds, such as Fe 3O 4, Fe 2TiO 4 etc . and their solid solution may be generated besides Fe 2O 3 and FeTiO 3. If the reduction temperature is higher than 1173 K, the metallization needs only half time of the case when the temperature is lower than 1073 K.
基金supported by the National Natural Science Foundation of China (Nos. 51401049, U1704253)Natural Science Foundation of Zhejiang Province (No. LR18E010001)Key Research and Development Program of Zhejiang Province (No. 2019C01121)
文摘An Fe-based nanocrystalline alloy powder is important for application in microwave absorption,and the particle size has a critical impact on the electromagnetic microwave parameters.Therefore,it is necessary to study further the effects of the particle size on such parameters and improve the microwave absorption performance of Febased nanocrystalline powers.In this study,Fe-B-P particles were prepared through a synthetic approach consisting of an aqueous chemical reduction and a ball milling treatment.We investigated the effects of ball milling on the microstructure and electromagnetic properties of Fe-B-P particles.The experimental results indicate that the Fe-B-P particles synthesized through an aqueous chemical reduction are amorphous spheres.Fe-B-P particles with an original particle size of 200-1200 nm can be milled into an irregular shape with the size reduced to\500 nm after 0.5 h of ball milling,and subsequently,the particles become smaller with increases in the milling time,with traces of Fe2O3 generated on the particle surface.The results of the Mo¨ssbauer spectra show that a portion of the small particles demonstrate a superparamagnetic property.The volume proportions of the superparamagnetic component increase from 13.1 to 15.8%as the treatment time increases.We measured the permittivity and permeability spectra of Fe-B-P particles within the frequency range of 2-18 GHz.The reflection loss(RL)is-10 dB for an absorber thickness of 1.7-5.0 mm.The RL is-20 dB for an absorber thickness of 1.9-2.7 mm.The microwave absorption properties of samples with the same thickness are improved with an increase in the treatment time and are shifted to a higher frequency,which will broaden the bandwidth of the absorption as well.
基金The Project Supported by National Natural Science Foundation of China
文摘Red blood cells (RBC) of the patients with cirrhosis and with primary liver cancer were studied by using Mossbauer spectroscopy. The measurements of RBC from normal adults were made as control. Results showed that the subspectrum representing deoxy-Hb either disappeared or diminished, but no other subspectrum was detected in the samples from the patients. In addition, the immune function of RBC of these two types of patients was measured by using immune-adherence haemagglutination (IAHA), which indicated that its immune function was significantly lower than that of normal adults (P【0.01). These experimental results showed that the components of hemoglobin in RBC are correlated with the immune function of RBC.
基金The Project Supported by National Natural Science Foundation of China
文摘About 100 crude Chinese mineral drug samples were investigated with M&’ssbauer spectroscopy, X-ray diffraction analysis and atomic absorption spectroscopy. The classifications, species and components of Chinese mineral drugs are elucidated. The pharmaceutic and curative mechanisms of these mineral drugs are discussed.