amorphous

Very often, determination of solid state, amorphous or crystal, is a very important and even difficult issue for pharmaceutical industry.

由于晶体和非晶(体)之间迥然不同的物理性质 ;通常而言 ,非晶(体)的化学性质较不稳定 ,溶解度较大 ,而且在一定的贮存、运输时间内 ,受周围环境的影响 ,包括温度、湿度 ,非晶(体)可能发生相变而转变成晶体 ,从而改变药物的释放特性。

Comparision between amorphous selenium flat-panel detector digital radiography and computed radiography in 30 spine imaging;

30例非晶(体)硒平板探测器DR与CR胸腰段脊柱成像的比较

Objective To compare the imaging quality and the anatomic detail in thoracolumbar spine of amorphous selenium flat-panel detector digital radiography(DR) system and computed radiography(CR) system.

目的比较非晶(体)硒平板探测器DR与CR系统的胸腰段脊柱照片图像质量和解剖结构可见度。

Three types of Fe_2O_3-based high temperature water gas shift catalysts were prepared by co-precipitation with(Fe(NO_3)_2) as a material,and their crystal phase were α-,γ-and amorphous type,respectively.

尽管γ-Fe2O3晶型催化剂比α-Fe2O3晶型催化剂具有更高的初始活性,但其结构的不稳定性造成催化剂强度低、密度大和耐热性能差的缺点;②非晶(体)型态Fe2O3极小的微观粒子尺寸和宏观上的非晶态物质“异向同性”特性,使得所制备催化剂具有较大的比表面积、相对低的密度、高强度、高耐热性和更高的活性稳定性等优点;③非晶(体)型态Fe2O3催化剂的综合性能最高,α-Fe2O3晶型的次之,而γ-Fe2O3晶型的综合性能最低。