steam ratio

In 0～30 kPa,the water-holding capacity and the specific water capacity of 0～20 cm soil layer in different slope positions were in accordance with rock fragment contents and opposite to physical clay content.

33%;砾石含量<10%,饱和含水量和田间持水量与砾石含量关系不明显;砾石含量>10%,饱和含水量和田间持水量与砾石含量变化趋势相反;在0~30 kPa吸力段,不同坡位0~20 cm土层的持水能力、比水容量与砾石含量变化趋势一致,与物理性粘粒含量变化趋势相反;水分特征曲线幂函数拟合式的a值与砾石含量变化趋势相反,b值与砾石含量变化趋势一致。

0×105 Pa;(3) the available water of alfalfas was the greatest,the available water of millets was the least,and the increase of the available water of alfalfas can be attributed to the increase of slowly available water;(4) the specific water capacity decreased quickly with soil moisture content around FC,while it retained relatively constant in 50%～60% of FC.

0×106Pa土壤基质势对应的土壤含水量;(3)苜蓿地有效水含量最高,谷子地有效水含量最低,而且苜蓿地土壤有效水含量的提高主要是提高了迟效水部分;(4)对不同土地利用方式下的土壤比水容量变化曲线研究表明,土壤比水容量在田间持水量附近随土壤含水量的降低减小的很快,而当土壤水分降低到田间持水量的50%~60%以下时,土壤比水容量基本不变。

The influences of the mass ratio of KOH to petroleum coke、microwave radiation power and time on the pore size distribution of the activated carbon and the specific capacitance of EDLC were studied.

研究了石油焦与KOH活化剂的比例、微波功率以及微波辐照时间对活性炭孔径分布和比电容量的影响。

It shows that the specific capacitance of coal based AC can reach 286.

研究了KOH与煤比例、微波功率和辐射时间对活性炭比电容量的影响,并考察了煤基活性炭双电层电容器的充放电特性。

A low-cost organic compound comprising mainly polyarylate was selected as precursor and a chemical activation method was used to prepare an activated carbon material of large surface area,with which the activated carbon electrodes of high specific capacitance were fabricated for supercapacitor.

考察了活化温度对活性炭电极比电容量的影响,研究了活性炭材料的比表面积和孔结构与活性炭电极的充放电性能之间的关系,并对活性碳电极进行了电化学表征。