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代寫英國termpaper:工程學碩士課程作業范文

時間:2019-01-24 14:26來源:未知 作者:anne 點擊:
本文是一篇英國留學生的工程碩士課程作業,閱讀一篇文章來完成450字SUMMARY 以下是閱讀文章后的寫作內容: 根據該期刊的內容,利用探地雷達(GPR)進行了兩次雷達調查,旨在重建埋藏在淺層
本文是一篇英國留學生的工程碩士課程作業,閱讀一篇文章來完成450字SUMMARY以下是閱讀文章后的寫作內容:
根據該期刊的內容,利用探地雷達(GPR)進行了兩次雷達調查,旨在重建埋藏在淺層地下的根系的幾何特征,探地雷達是一種非侵入性遙感技術,在考古領域里,工程學在很多方面得到越來越廣泛的應用。環境科學。結果表明,GPR在進行任何破壞性試驗之前是一種理想的偵察方法,因此具有很大的實際應用潛力。
作者介紹了探地雷達作為一種遙感技術,利用無線電波提供了地下的詳細地圖,無線電波是在地表以上產生的。 GPR的主要優點是無損檢測與自然或人工子表面變化相關的垂直和水平介電異常。另外,GPR可以與多技術方法中的其他技術結合使用。因此,探地雷達已被用于各個領域,包括考古學,環境科學和地球科學。在地球科學中,探地雷達是一種利用電磁(EM)波形圖像結構和地下埋藏特征的地球物理方法。背后的基本原理是埋藏靶和背景材料(土壤,水和巖石)的介電常數不同,并且可以觀察到可歸因于各種因素的介電對比度。在不同的地下物體之間存在可檢測的介電對比度的情況下,可以在GPR圖像上清楚地識別強信號反射。
作者進行了兩個關于雷達調查的案例研究,旨在繪制根系圖。第一個案例是對當地公園樹根的GPR測量。使用雙靜態GPR系統對40m x10區域進行了調查,并進行了多次測量Ygrid(總共20條平行線)的測量,線間距為0.50m,步長為0.05m。案例是在羅馬當地一所大學的修道院中,對埋藏殘留根的GPR調查,仍然存在于一棵大樹被拆除的地區。該調查是通過雙靜態500 MHz Noggin Plus GPR系統實現的。通過收集多輪廓Y網格(總共26條平行線)研究了14 m x12 marea,線間距為0.50m,步長為0.02m。
總之,由于其非侵入性和實時數據采集,GPR作為遙感技術的潛力應用于地球科學。將來,應該考慮這種技術的經濟價值。設備成本適中,加上大面積的快速采集時間,使GPR在地質應用中具有很強的競爭力。According to the journal, two radar surveys aimed atreconstructing the geometric features of root systems buried at shallow subsurface were conducted using Ground Penetrating Radar (GPR), a non-invasiveremote-sensing technique that has gained increasing popularity and wide application in archaeology,engineering and environmental sciences. The results illustrate that GPR is an ideal reconnaissance method before performing any destructive test, thus having a great potential for practical applications.
The author introduced GPR as a remote sensing technique providing a detailedmap of the subsurface using radio waves,which are generatedjust above the ground surface. The main advantage of GPR is the non-destructive detection of vertical and horizontal dielectric anomalies associated with natural or manmadesubsurface variability. Additionally, GPR can be used in combination with other techniques in a multi-technique approach. Therefore, GPR has been used in various fields, including archaeology,environmental science and geoscience.In geoscience, GPR is a geophysical method which uses electromagnetic (EM) wavesto image structures and features buried underground. The basic principle behind isthat the dielectric constants ofthe buried target and the backgroundmaterial (soil, water and rocks) are differentand a dielectric contrast, which can be attributed to various factors, will be observed. In cases that there is a detectable dielectric contrast between different subsurface objects, strong signal reflectionscan be clearly identified on a GPR image.
The author performedtwo case studies about the radar investigations aimed at mappingthe root system are presented.The first case is a GPR survey of tree roots in a local park. The 40m x10marea was investigatedusing a bi-static GPR system and the survey was performed acquiring a multi-profile Ygrid (for a total of 20 parallel lines), with a line spacing of 0.50m and a step-size of0.05m.The second case is a GPR survey of buried residual roots, still present in an area where a big tree waspreviously removed,in thecloister of a local university in Rome. This survey is achieved bya bi-static 500 MHz Noggin Plus GPR system. The14 m x12 marea wasinvestigated by collecting a multi-profile Y grid (for a total of 26 parallel lines) with a linespacing of 0.50m and a step-size of 0.02m.
In conclusion, the potentials of GPR as remote-sensing techniqueapplied to geoscience, in virtue of its non-invasive nature and real-time data acquisition. In the future, some considerations should be made on the economic value of this technique. The moderate cost of the equipment, together with the fast acquisition time in large areas, makes GPR quite competitive for geological applications.
 


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