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Carbonated hydroxyapatites(CHA) were rapidly and continuously synthesized in supercritical water by using a tubular reactor. The effects of reaction time and the ratio of PO43-/CO32- on the apatite structure were investigated by using XRD, FTIR and TEM. Results showed that 30 seconds were enough to produce fully crystalline CHA nano-rods, ca. 20×70 nm in size, at 380 ℃ and 24 MPa. When the ratio of PO43-/CO32- was not less than 1, the CO32- ions mainly substituted for PO43- in apatite structure; but CO32- ions could react with Ca2+ to form CaCO3 phase when the ratio of PO43-/CO32- was less than 1. 相似文献
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针对当代核心素养背景下学科核心素养中人文向度的部分缺失,以美国主流理科教科书《化学:概念与应用》作为研究对象,选取了4则人文意蕴特征明显、内涵丰富的“跨学科”栏目典型案例,通过对其人文意蕴向度的结构性与教学价值分析,获得学科人文智性及其教育的启示:以科学与人文的对话推动2个世界的沟通;以科学的革命性突跃弘扬科学精神的人文光辉;倡导自然与艺术和谐统一的人文审美意向;肩负社会责任与维护和平正义的进步人文思想。 为学科教学中人文教学资源的研究开发提供认识导向;为完善当前学科核心素养内容提供参考;并从选材理念、教学准备、课程教学、目标达成4个方面为该类资源的教学应用提供策略建议。 相似文献
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在德拜相实验中,测量德拜环之前需要分清前/回射区。以往的方法是根据底片的背景来判断。由于形成底片背景的因素很多,且每次拍的底片质量也不一样,往往不易分清,甚至判断失误。 相似文献
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