نتایج جستجو برای: land grading

تعداد نتایج: 136559  

2008
Zhanlu Zhang Ying Li

As regards the influencing radius and influencing area of agricultural land grading factor, the agricultural land grading regulation simply use decay method or exponential method to determine their values, what is more, it only considers the natural factors of land grading and takes little account of socioeconomic factors. So, there are some defects in agricultural land grading. To address abov...

Journal: :international journal of industrial engineering and productional research- 0
hossein shams shemirani golpayegan university of technology faride bahrami golpayegan university of technology mohammad modarres sharif university of technology

in this paper we develop a new approach for land leveling in order to improve the topology of a large area for irrigation or civil projects. the objective in proposed model is to minimize the total volume of cutting so that technical requirements of land leveling such as suitable slope and standard ratio of cutting to filling and maximum penstock point’s height are considered. we develop a warp...

2011
Yanqing Chen Jianyu Yang Chao Zhang Zhouting Sun Dongping Ming

With the second national land survey carried out, land grading method is nearly mature, but change monitoring of cultivated lands level has not yet been proposed an effective method. The paper makes the second national land survey as research basis for change monitoring. According to the differences of indicator monitoring periods, authors introduce the concept of volatile indicators. Change mo...

Journal: :Geo-spatial Information Science 2004

Journal: :Journal of Irrigation and Drainage Engineering 1986

2002
ANNA NORiN

Noren, A. & Persson, A. 1997. Graded quality of 30-year-old Norway spruce grown on agricultural and forest land. Studia Forestalia Suecica 203. 19 pp. ISSN 0039-3150. ISBN 91-576-5553-7. Six 30-year-old, fast-grown Norway spruce (Picea abies (L.) Karst.) stands in Sweden, comprising a total of 700 stems, were examined. Four had been planted on agricultural land and two on very fertile forest la...

Journal: :Journal of the Royal Army Medical Corps 2003
J P Owen

AIM To identify reasons for inappropriate deployment of soldiers with chronic conditions to an operational environment. SETTING Two British Army field hospitals in Kuwait, 08 February to 17 March 2003, during the period of troop concentration prior to war-fighting (Operation Telic). POPULATION All British military personnel on land during the concentration phase, rising to an estimated 28,0...

The presence of Damghan Erg in West of Damghan Playa indicates high wind activity in this desert region. Due to technological advances and population growth in recent decades, large parts of past land uses have changed. These changes can exacerbate wind erosion and affect lands sedimentation. In this study, first, the land use maps of years 1974 and 2003 were prepared. The comparison of these m...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید