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水-空气引射式冰下深水增氧机的设计与性能试验研究 被引量:21
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作者 庞云芝 李秀金 《农业工程学报》 EI CAS CSCD 北大核心 2003年第3期112-115,共4页
根据水 -空气引射原理设计了一种新型增氧机 ,可同时进行冰下和深水的增氧 ,以解决我国北方地区冬季鱼类供氧和鱼池水质净化问题。对其主要结构参数进行了设计计算和试验研究。结果显示 ,当喷嘴直径 dp1 =2 5 m m、混合室直径 d3=48m m... 根据水 -空气引射原理设计了一种新型增氧机 ,可同时进行冰下和深水的增氧 ,以解决我国北方地区冬季鱼类供氧和鱼池水质净化问题。对其主要结构参数进行了设计计算和试验研究。结果显示 ,当喷嘴直径 dp1 =2 5 m m、混合室直径 d3=48m m、截面积比 f3/fp1 =3 .69时 ,该装置的进气量最大 ,增氧动力效率最高 ;进气量与增氧动力效率之间呈正相关关系 ;增氧动力效率随深度的增加而提高 ,增加率为 0 .49kg O2 · m- 1 ;喷嘴位置对动力效率和进气量并无影响。 展开更多
关键词 引射器 动力效率 冰下 深水增氧
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Discussion of Fenlong Cultivation Supporting Food and Environment Safety and Broadening Survival and Development Space 被引量:3
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作者 韦本辉 《Agricultural Science & Technology》 CAS 2016年第2期467-470,480,共5页
A new high-efficiency farming method of global significance, Fenlong tech- nique capable of making soil fertile, increasing yield and improving ecological envi- ronment was introduced; and the Fenlong technique could ... A new high-efficiency farming method of global significance, Fenlong tech- nique capable of making soil fertile, increasing yield and improving ecological envi- ronment was introduced; and the Fenlong technique could deeply plough and scarify soil with a depth up to 30-50 cm, which is deeper than the depth of tractor tillage, solving the problem of difficulties in deeply ploughing and scarifying soil and keeping soil loose for muttiple seasons. The application to 20 crops in 18 provinces proved that yield could be increased by 10%-30% without increase in chemical fertilizer, quality could be improved by more than 5%, and water storage could be increased by 100%; yield could be increased for multiple seasons sustainably, and the yield of dry-land crops increased by 32.57%-38.2% from the second year to the fourth year; the net benefits of rice increased by 21.82% averagely from the first season to the sixth season; and the usage amount of chemical fertilizer decreased by 0.35-4.29 kg per 100 kg produced grain compared with conventional tillage, with an decrease amplitude of 10.81%-30.99%. It was discussed that the Fenlong technique could maximize friendly permanently-sustainable unitization of "natural resources" including soil nutrients, water, oxygen and light energy, and has good development potential in multiple fields. It was put forward that if it is popularized in 0.67x108 hm2, pro- ductivity of farmland could be newly increased by 0.1-0.13×10^8 hm2, 5.0 ×10^6 t of chemical fertilizer could be saved, the' storage of agricultural water could be in- creased by 3.0×10^10 m3, and increased food could feed 2,0-3.0×10^8 people. 展开更多
关键词 Deep rotary tillage Fertilizing soil increasing yield and retaining water Increasing yield by 10%-30% Increasing storage of water precipitation by 100% Fenlong cultivation technique
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