نتایج جستجو برای: shovel
تعداد نتایج: 326 فیلتر نتایج به سال:
In this study, we present the results of a comprehensive, landscape-scale remote sensing project at Santa Elena on Parris Island, South Carolina. Substantial occupation at the site extends for over 4000 years and has resulted in a complex array of features dating to different time periods. In addition, there is a 40-year history of archaeological research at the site that includes a large-scale...
The selection of soil development is generally guided by the need to treat a certain area site in shortest time and with least effort energy. In small household plots, grant carried out hand garden shovels without use mechanized or electromechanized means. Such blades have sharp metal extended tip wooden shaft. They are widely used due their relative cheapness, but they low productivity because...
Picohydro Power Plant (PLTPH) is designed for water with a small flow, the design of this PLTPH does not require complicated construction output reaching several kilowatts. This uses materials that can be found easily and are widely available. The turbine made using sand shovel, reservoir used drum, DC generator, inverter circuit, battery other supporting tools. produces nominal power 450 watts...
The agronomic technology of whole plastic-film mulching on double ridges has been widely promoted in the arid region northwest China, which caused serious residual film pollution field. Mechanized collecting is main way, but this way more complicated. To prove effect typical film-lifting parts performance by a numerical simulation method, further evaluate and select working suitable for improve...
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