From March 30 to April 2, 1997, the CAS Conference of Young Talents for the Next Century was successfully convened in Beijing. The conference is aimed at reviewing and swapping the experience in cultivating young tale...From March 30 to April 2, 1997, the CAS Conference of Young Talents for the Next Century was successfully convened in Beijing. The conference is aimed at reviewing and swapping the experience in cultivating young talents and further perfecting various policies in this regard. At the same time, it provides a forum for the exchange of ideas and an opportunity of mutually learning from each other among participants. The scientists attending the meeting were out standing researchers younger than 45 in age and from various disciplines. In addition, most of them are century-cross-ing leaders and disciplinary pace-setters in their own specialities. During the conference, Chinese Premier Li Peng met the participants. He encouraged the broad masses of young S&T workers to forge ahead by opening new horizons and through ceaseless creation so that they can make more con-展开更多
Alpha-calcium sulfate hemihydrate (α-HH) has been prepared from flue gas desulfurization (FGD) gypsum with salt solution method under atmospheric pressure. X-ray diffraction (XRD),thermogra-vimetry and differential s...Alpha-calcium sulfate hemihydrate (α-HH) has been prepared from flue gas desulfurization (FGD) gypsum with salt solution method under atmospheric pressure. X-ray diffraction (XRD),thermogra-vimetry and differential scanning calorimetry (TG-DSC),optical micrograph,X-ray photoelectron spec-troscopy (XPS),energy dispersive spectrometry (EDS),and scanning electron microscopy (SEM) have been employed to characterize the α-HH crystals,based on which the formation and growth mecha-nisms of the α-HH crystals have been discussed. The results show that FGD gypsum can be success-fully transformed into high purity α-HH in salt solution under mild conditions,and that a dissolu-tion-recrystallization route is most probably adopted by this transition. The growth of α-HH crystals in salt solution demonstrates a preferred direction along [001] and results in a bundle-of-sheets or bun-dle-of-raphide texture. The characteristics revealed in this study can help to understand and control the growth of the α-HH crystal from solution.展开更多
文摘From March 30 to April 2, 1997, the CAS Conference of Young Talents for the Next Century was successfully convened in Beijing. The conference is aimed at reviewing and swapping the experience in cultivating young talents and further perfecting various policies in this regard. At the same time, it provides a forum for the exchange of ideas and an opportunity of mutually learning from each other among participants. The scientists attending the meeting were out standing researchers younger than 45 in age and from various disciplines. In addition, most of them are century-cross-ing leaders and disciplinary pace-setters in their own specialities. During the conference, Chinese Premier Li Peng met the participants. He encouraged the broad masses of young S&T workers to forge ahead by opening new horizons and through ceaseless creation so that they can make more con-
基金Supported by the National High-Tech Research & Development Program of China (Grant No. 2006AA06Z385)New Century Excellent Talents in University (Grant No. NCET-04-0549)the Project of Science and Technology Plan of Zhejiang Province (Grant No. 2007C23055)
文摘Alpha-calcium sulfate hemihydrate (α-HH) has been prepared from flue gas desulfurization (FGD) gypsum with salt solution method under atmospheric pressure. X-ray diffraction (XRD),thermogra-vimetry and differential scanning calorimetry (TG-DSC),optical micrograph,X-ray photoelectron spec-troscopy (XPS),energy dispersive spectrometry (EDS),and scanning electron microscopy (SEM) have been employed to characterize the α-HH crystals,based on which the formation and growth mecha-nisms of the α-HH crystals have been discussed. The results show that FGD gypsum can be success-fully transformed into high purity α-HH in salt solution under mild conditions,and that a dissolu-tion-recrystallization route is most probably adopted by this transition. The growth of α-HH crystals in salt solution demonstrates a preferred direction along [001] and results in a bundle-of-sheets or bun-dle-of-raphide texture. The characteristics revealed in this study can help to understand and control the growth of the α-HH crystal from solution.
