……To examine the effect of electric field on the aggregation structure of the particles, we observed light scattering of the suspension under an electric field, and found that the scattering pattern became anisotropic. ……

……We demonstrate the thermally activated nature of theβ-PMMA and β-P(VDF-TrFE) relaxation, with activation energies of 29.3 and 13.5 kcal/mol, respectively. ……

……We refer to the lamellar thickening process as a type of secondary crystallization. ……

概括起来：
·作者告诉读者论述怎样的主题，可用现在时
·用过去时及其被动语态叙述实验方法与过程,；表示实验前业已完成的动作（过去的过去），用过去完成时。例如：
The crystallized samples had been polished before they were etched in a 0.5％ HF solution at a temperature of 25℃ for 2 s ,
·对实验结果可用现在时（表示客观真理）或现在完成时（已取得的阶段性成果）。

关于结构式文摘

据统计，目前世界上约有60％的核心生物医学期刊采用结构式摘要，但此种摘要不适合综述之类的文章。
结构式文摘是按Objective（目的）、Methods（方法）、Results（结果）和Conclusions（结论）逐一阐述论文的梗概。在Objective项，可直接用动词不定式的一般式主动语态，如To provide, To explore, …; Methods和Results 项，可用一般过去时（有时也用现在完成时）及其被动语态；Conclusions 则用一般现在时(参见：韩仲琪，李炳汝，王庆法. 医学论文英文摘要格式及其写作问题. 编辑学报，2002，14（6）：412)