美国工程索引对文摘的例文
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发布人:administrator 发布时间:2011/10/26 14:07:31  浏览次数:11812次
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英文摘要写作须知

An abstract is a concise summary of your work. "A well prepared abstract enables readers to identify the basic content of a document quickly and accurately, to determine its relevance to their interests, and thus to decide whether they need to read the document in its entirety" (American National Standards Institute, 1979). Abstracts should state the objectives of the project, describe the methods used, summarize the significant findings and state the implications of the findings (Day, 1988).

科技论文文摘应该 具备以下几个 部分:研究的目的,研究的过程和采用的方法,结果,结论。

文摘是相对独立的。 在数据库里文摘通常和文章本身分开。因此,一篇文章的文摘是最有机会让读者得到的,很可能 是读者唯一会看的作品。 要写好文摘须注意以下几点:

1.完整性:complete in and of itself; that is, it should be able to serve as a stand-alone description which provides a complete picture of the resource at the selected level of specificity;

2. 可读性 comprehensive in its representation of the key concepts or significant content that are present in the resource;

3.准确 concise, precise, and accurate in its use of terminology;

4.客观 written in a clear, terse, non-critical style; and

5.逻辑性:logically structured in its presentation (见以上4个组成部分) of the selected data and information.

Shown below is an example of how an abstract is to be structured. The components of a well-written abstract are labeled.

Dryland Grain Sorghum Water Use, Light Interception, and Growth Responses to Planting Geometry
J. L. Steiner
ABSTRACT

Rationale

Crop yields are primarily water-limited under dryland production systems in emiarid regions.

Objectives

This study was conducted to determine whether the growing season water balance could be manipulated through planting geometry.

Methods

The effects of row spacing, row direction, and plant population on the water use, light interception, and growth or grain sorghum [Sorghum bicolor (L.) Moenchl were investigated at Bushiand, TX, on a Pullman clay loam (fine, mixed, thermic Torrertic Paleustoll)].

Results

In 1983, which had a dry growing season, narrow-row spacing and higher population increased seasonal evapotranspiration (ET) by 7 and 9cvo, espectively, and shifted the partitioning of ET to the vegetative period. Mediurti population crops yielded 6.2 and 2.3 Mg/ha of dry matter and grain, respectively. High population resulted in high dry matter (6.1 Mg/ha) and low grain yield (1.6 Mg/ha), whereas low population resulted in low dry matter (5.4 Mg/ha) and high grain yield (2.3 Mg/ha). Row direction did not affect water use or yield. In 1984, dry matter production for a given amount of ET and light interception was higher in the narrow-row crops. Evapotranspiration was less for a given amount of light interception in the narrow-row crops and in the north-south row crops.

Conclusion

Narrow row planting geometry appears to increase the partitioning of ET to the transpiration component and may improve the efficiency of dryland cropping systems.


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