加拿大多伦多消息:对鉴别不能解释的胸痛是否来自于食管,激发试验对病人非常有益。 Don Castell医师(费城Jefferson医科大学内科教授)说,激发试验结果呈阳性表明病人的胸痛是因食管所致。激发试验技术包括香咽冷水、五肽促胃酸激素、麦...加拿大多伦多消息:对鉴别不能解释的胸痛是否来自于食管,激发试验对病人非常有益。 Don Castell医师(费城Jefferson医科大学内科教授)说,激发试验结果呈阳性表明病人的胸痛是因食管所致。激发试验技术包括香咽冷水、五肽促胃酸激素、麦角新碱、Bernstein试验(酸灌注)、张力试验(滕西隆)和气球膨胀。展开更多
As a main charging burden of blast furnace(BF)ironmaking process,pellets play an important role in ironmaking process.However,compared with sinters,there are some inevitable disadvantages for traditional acid pellets,...As a main charging burden of blast furnace(BF)ironmaking process,pellets play an important role in ironmaking process.However,compared with sinters,there are some inevitable disadvantages for traditional acid pellets,e.g.,reduction swell,low melting temperature.Therefore,the fluxed-pellets have been applied in BF,especially MgO-fluxed pellets.In the present study,the effects of category and content of MgO bearing additive on the compressive strength(CS),reduction swelling index(RSI),reduction disintegration index(RDI)and melting-dripping properties of the pellets were investigated.Minerals composition,pore distribution and microstructure of MgO-flux pellets were studied by X-ray powder diffraction(XRD),mercury intrusion method and scanning electron microscopy(SEM),respectively.The results show that the light burned magnesite(LBM)is more suitable MgO bearing additive for fluxed-pellets.With increasing LBM content from 0 to 2.0%,the CS decreases from 3066 to 2689 N,RSI decreases from 16.43%to 9.97%and RDI decreases from 19.2%to 12.99%.The most appropriate MgO bearing additive content in the fluxed-pellets is 2.0%according to principal component analysis(PCA).展开更多
Having found some orbit variation mechanisms of natural satellites and planets, the author has revealed the formation and evolution law of the Moon. According to this law, the author has further revealed the formation...Having found some orbit variation mechanisms of natural satellites and planets, the author has revealed the formation and evolution law of the Moon. According to this law, the author has further revealed the formation and evolution law of the Solar System and other galaxies in the universe. Especially, the author has also explained why the eight planets around the Sun are prograde planets, why the orbits of the eight planets almost lie in the same plane, and why most planets rotate around their own axes from west to east. Additionally, the author could also explain the expansion of the universe as well as the cause of global climate change.展开更多
文摘加拿大多伦多消息:对鉴别不能解释的胸痛是否来自于食管,激发试验对病人非常有益。 Don Castell医师(费城Jefferson医科大学内科教授)说,激发试验结果呈阳性表明病人的胸痛是因食管所致。激发试验技术包括香咽冷水、五肽促胃酸激素、麦角新碱、Bernstein试验(酸灌注)、张力试验(滕西隆)和气球膨胀。
基金Projects(51874080,51604069)supported by the National Natural Science Foundation of ChinaProject(N162504004)supported by the Fundamental Research Funds for the Central Universities,China
文摘As a main charging burden of blast furnace(BF)ironmaking process,pellets play an important role in ironmaking process.However,compared with sinters,there are some inevitable disadvantages for traditional acid pellets,e.g.,reduction swell,low melting temperature.Therefore,the fluxed-pellets have been applied in BF,especially MgO-fluxed pellets.In the present study,the effects of category and content of MgO bearing additive on the compressive strength(CS),reduction swelling index(RSI),reduction disintegration index(RDI)and melting-dripping properties of the pellets were investigated.Minerals composition,pore distribution and microstructure of MgO-flux pellets were studied by X-ray powder diffraction(XRD),mercury intrusion method and scanning electron microscopy(SEM),respectively.The results show that the light burned magnesite(LBM)is more suitable MgO bearing additive for fluxed-pellets.With increasing LBM content from 0 to 2.0%,the CS decreases from 3066 to 2689 N,RSI decreases from 16.43%to 9.97%and RDI decreases from 19.2%to 12.99%.The most appropriate MgO bearing additive content in the fluxed-pellets is 2.0%according to principal component analysis(PCA).
文摘Having found some orbit variation mechanisms of natural satellites and planets, the author has revealed the formation and evolution law of the Moon. According to this law, the author has further revealed the formation and evolution law of the Solar System and other galaxies in the universe. Especially, the author has also explained why the eight planets around the Sun are prograde planets, why the orbits of the eight planets almost lie in the same plane, and why most planets rotate around their own axes from west to east. Additionally, the author could also explain the expansion of the universe as well as the cause of global climate change.
