positive crystal

This Bragg Equation is without limit on crystal size, can be used to describe the angular divergence of minicrystal diffraction, diffraction of thin crystal, and the integral intensity of polycrystal diffraction in positive lattice, etc.

广义布拉格方程不受晶体尺寸限制，可以在正空间中描述微晶体衍射的角发散，薄晶体的衍射，多晶体衍射的积分强度等问题。

Positive and Negative Gains Transition of ps Laser Pulses Two-wave Coupling in a Photorefractive Crystal

光折变晶体中ps激光脉冲二波耦合增益正负转换现象

Methods Under different administration modes, the inhibitory effect of Lianhua Qingwen Capsule on human influenza A virus ( H3N2) in vitro and its time-effect relationship were assayed by crystal violet staining assay with ribavirin as positive reference drug.

方法以利巴韦林作阳性对照药物，采用存留细胞结晶紫染色法测定连花清瘟胶囊不同给药方式对甲型人流感病毒H3N2的体外抑制作用及其时效关系。