The Zhifanggou watershed in Ansai county is an example of a Loess Hilly Region and the characteristics of nutrient cycling and balance of 1 tree,4 shrub,and 9 herbage vegetation types have been systematically studied during a period of vegetation stabilization and rehabilitation.
以黄土丘陵沟壑区典型小流域纸坊沟流域为例,系统研究流域在植被稳定恢复期1种乔木、4种灌木和9种草地植被类型的养分循环平衡特征。
According to the policy of vegetation restoration and different land use type adjustment in loess hilly region, vegetation restoration affecting the soil erosion, nutrient discharge and nutrient cycling and balance of watershed are reviewed on field plot and watershed.
针对在陕北黄土丘陵沟壑区实施的植被恢复及不同土地利用类型调整的政策,在小区和流域尺度上,就植被恢复对流域水土流失、养分流失、养分循环平衡影响方面的国内外研究概况进行了综述。
Recycling system construction effect on urban environment and resources circulation;
再生资源回收利用体系建设对城市环境和资源循环利用的作用
Study on sludge reduction by aerobic/anaerobic alternation and circulation methods;
好氧/厌氧交替与循环工艺用于污泥减量化研究
Allocation,circulation and purifying effect of nickel in synthetic wastewater in Avicennia marina simulated wetland system;
模拟分析白骨壤湿地系统中Ni的分配循环及其净化效果
Working Cycle Analysis of the Engine Retarder;
车用发动机缓速器工作循环的理论分析
The problems revealed during the commissioning of the 75t/h cycle-fluidized-bed-boiler and the improvements;
75t/h循环流化床锅炉试运行中暴露出的问题及改进方法
The Application of Refrigerant Recovery, Recycle and Regenerate Technique in Production;
制冷剂的回收、循环和再生技术在生产中的应用
Technical innovation of recycled-water system;
橡胶轮胎生产循环水系统的技术改造
The different addition metal,temperature,pressure,the dosage of sodium hydroxide,catalyst recycle times were investigated in hydrogenation of o-CNB to DHB.
通过对骨架镍催化剂添加第三金属M(Mo,Ti,Cr)制备改性骨架镍催化剂,并采用间歇加压釜式反应器对改性骨架镍催化剂进行活性评价,考察了不同添加金属、反应压力、温度、碱量、催化剂循环套用次数等工艺条件对催化加氢法制备2,2'-二氯氢化偶氮苯的影响。