《2017-科技英语写作授课教程》.pptVIP

赵建玲 论文人称和时态 一、科技论文要求叙述客观，读者关注作者的研究内容和结论，而非作者本人，所以应避免使用。 二、论文常用时态 1. 叙述论文研究之前所进行的工作（通常出现在论文的部分） 具体时间或具体人的一般采用；对以前工作的总结一般采用。 Lee et al. [17] (report) a so-called ‘hard anodization’ approach to obtain highly ordered PAA with a wide range of pore sizes and interpore distances. A lot of work (devote) to investigating the formation mechanisms of PAA [4–8], and considerable research efforts (direct) toward the fabrication of the PAA with long-range ordered nanoholes [9–18]. 2. 实验经过、实验过程的描述通常采用。 The spectra (record). The structure ( determine) by neutron diffraction methods. The electrolyte solutions(prepare) from reagent grade chemicals and deionized water. The morphology of the PAA film (characterize) by field-emission scanning electron microscopy(FE-SEM, Hitachi S-4800). 3. 图表介绍、公式说明、实验结果、实验结论等通常采用。 Fig. 3（show) SEM images of the as-prepared samples. In order to further understand the effect of EG on the morphology of PAA, EIS measurements (carry) out for the films obtained in EG and aqueous solutions. Impedance spectra for the films (illustrate) in Fig. 5 in the form of Bode plot. The PAA films formed in both EG and aqueous solutions (exhibit）a quasi linear change in the impedance modulus in the experimental frequency range with a slope close to 1. 总之： ? 表示“报道、研究、综述”等，通常用一般现在时 In this paper we report the synthesis of RFC containing barium ferrite according to a specific method and its evaluation of dielectric and mechanical properties. The probable mode of evolution is discussed. ?? 叙述他人已报道的内容用一般过去时或现在完成时 In the past decade public attention more and more focused on the potential applications of renewable resources. ? 表示研究过程的行为通常用一般过去时 High Density Polyethylene (HDPE) was kindly supplied by FIAT (Italy). The HDPE was blended with the LDPE, in the molten state at high temperature (200℃), using a Brabender blender, equipped with rotating blades. ? 表示实验结果及其产生的原因,通常用一般现在时 Tensil