英语论文网

英语论文正文的写作技巧英语学术论文的主体部分由引言、正文和结论构成。正文部分包括方法、结果与讨论。由于学术论文所涉及的学科、范围广泛，即使在同一学科领域内，由于选题、研究方法、工作进程不同，英语论文正文部分的内容也不尽相同，写作方法也就不存在统一的规定或一成不变的模式。所以，本章只着重介绍写英语论文正文部分时一些较为典型的语言现象，希望读者能够从中寻求到一般规律。

    7.1  描述研究方法
    研究方法(Method)部分主要内容包括：
    (1)研究工作具备的基本前提或条件，如实验材料、实验场所、设备器材等。
    (2)采样、实验、获取数据，并对数据进行技术处理的方法与过程。
    (3)理论分析，包括理论依据、基本原理、公式推导、数理模型等。
采样与实验过程，要根据先后顺序或步骤进行描述。例1选自描述对千屈莱这种植物生长的采样与实验过程。
例l
    Materials and Methods
  [1] In August 1994，entire purple loosestrife(千屈莱)plants were harvested from three habitats(生长环境)：1) an upland old field in the Cuyahoga Valley National Recreation Area in north-eastern Ohio (n=5)；2) a shallow ditch along Route 261 in Kent, OH (n = 10); and 3) the western shoreline of East Twin Lake, Portage County, OH (n = 6). These sites represent habitats which are never inundated(淹没) with water, are periodically inundated, or have saturated(浸透) soils, respectively. [2]Shoot sections (嫩枝条)of 5, 10, and 15 cm lengths were cut from these plants and positioned in flats(平地) containing a soil  mixture of perlite (珍珠岩), vermiculite ( 蛭岩), and peatmoss (苔泥炭) ( 1:1:1). The flats were maintained in the Department of Biological Sciences' greenhouse where they experienced ambient meteorological conditions except for 6 seconds of mist every 3. 5 minutes between 8: 00 and 20: 00 hours daily. Shoot sections and attached leaves were examined at weekly intervals for pigment (色质) and tissue changes as well as for development of lateral shoots. After 26～28 days the sections were rinsed to remove adherent material and dried at room temperature (approximately 22℃ ) for a week. The adventitious roots from each section were removed with needle-nose forceps, dried at 60℃ for 24 hours, and then weighed to determine dry biomass. One lake site 5-cm section was lost during processing.
 分析：   
此部分严格按照时间顺序描述实验过程。第1段描述采样的时间、试样的来源与数量。名叫“千屈莱”的试样来自三个地带，分别代表三种生长环境。试样的数量分别是5、10、6棵。第2段首先描述实验基地，及其环境与条件。然后客观描述实验的详细过程与步骤。描述某一研究方法时，要考虑读者是否了解此方法。如果不了解，描述便需要详细一些。这一点在农、林、医学、教育、社会科学、环境科学等领域尤为突出。例2中的选段描述的是一个关于生活用水和农业用水质量”函授培训班的教学与评估方法。由于教学过程与评估方法的特殊性，读者事先不可能对它有详细了解，所以文中要描述得清楚、详细一些。
例2
Correspondence Teaching Methods
[1] The program evaluated in this research was a correspondence training course entitled "Quality Water for Home and Farm" developed for county extension agents( 函授部学员). The program began with a one-day meeting followed by seven monthly written lessons. The program concluded with another one-day meeting. The one lesson-per-month format was selected to allow agents to complete the assignments as part of their regular work schedule.
[2] The program followed a simple model for identifying water quality problems and potential solutions.
Step 1: Identify the beneficial uses of water (such as for drinking water, livestock water, irrigation, recreation).
Step 2: Test the water to ensure that it is of sufficient quality for the beneficial use.
Step 3: If water quality problems are identified, examine correction options in four categories to determine which is most affordable and appropriate. The categories are:
          1. Protect the supply from the contaminant;
          2. Find and eliminate the contaminant source;
          3. Treat t本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。