英语中自 million 开始的大数数词除个别数词外,在构词上有一定规律。只要了解了这种规律,便可容易而正确地掌握大数数词。本文将详细分析英语大数数词的构词方式与算术值的关系。英语大数数词是由代表幂数的前缀与词根-illion 构成的...英语中自 million 开始的大数数词除个别数词外,在构词上有一定规律。只要了解了这种规律,便可容易而正确地掌握大数数词。本文将详细分析英语大数数词的构词方式与算术值的关系。英语大数数词是由代表幂数的前缀与词根-illion 构成的派生词。由于美国英语和英国英语的大数名称的构成方法不同,因此词根-illion 在两种英语中含意不同。这也是同一大数数词(如 billion)在两种英语中算术值不同的原因。展开更多
Porous sol-gel glass of CaO-SiO2-P2O5 system with macropores larger than 100 μm was prepared by adding stearic acid as pore former when the sintering was carried out at 700 ℃ for 3h.The sol-gel porous glass shows an...Porous sol-gel glass of CaO-SiO2-P2O5 system with macropores larger than 100 μm was prepared by adding stearic acid as pore former when the sintering was carried out at 700 ℃ for 3h.The sol-gel porous glass shows an amorphous structure. The diameter of the pore created by pore former varies from 100 to 300 μm, and macroporous glass has a narrow and small pore size distribution in mesoporous scale. The porosity and pore size of macroporous bioactive glass can be controlled.展开更多
基金Project(50174059) supported by the National Natural Science Foundation of China
文摘Porous sol-gel glass of CaO-SiO2-P2O5 system with macropores larger than 100 μm was prepared by adding stearic acid as pore former when the sintering was carried out at 700 ℃ for 3h.The sol-gel porous glass shows an amorphous structure. The diameter of the pore created by pore former varies from 100 to 300 μm, and macroporous glass has a narrow and small pore size distribution in mesoporous scale. The porosity and pore size of macroporous bioactive glass can be controlled.
