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1)  discrete diffusion
离散扩散
2)  Ion diffusion
离子扩散
1.
The Research and Development of Ion Diffusion in Soils
土壤中离子扩散研究进展
2.
Ion diffusion kinetics in soils can be classified into three types:negative first-order, zero-order and first-order kinetics.
本文首先从理论上分析了土壤中离子扩散的动力学问题,提出了土壤中离子扩散的三种动力学类型,即扩散的一级动力学、零级动力学和负一级动力学,并且还指出,一级动力学是土壤中离于扩散的普遍形式,负一级动力学只出现在过程的初期阶段,而扩散的零级动力学则存在于有快速表面反应的情况下。
3.
Experimental results show that,the excursion of the peak potential of CV curves is caused by ion diffusion in three-dimensional MRGC film electrodes;the ion diffusion resistance in electrode decreases with the increase of thickness of graphite matrix,this leads to the decrease of ΔE_p with the increase of spacing between graphite cores.
研究结果表明,由于三维MRGC膜电极系统内部离子扩散影响,CV图的峰电位将发生偏移。
3)  ionic diffusion
离子扩散
4)  diffusion distance
扩散距离
1.
The results showed that the diffusion distance follows an exponential temperature dependence,i.
结果表明:吸附原子的扩散距离随温度的变化满足指数函数L=L0AeT/C。
2.
The results show that the diffusion distance rises with the increase of incident energy above a certain temperature and under a certain deposition rate,and is hardly affected by the energy size of deposition particles at higher temperature and lower deposition rate.
结果表明:随着入射率的降低和温度的升高,不同入射能量对扩散距离影响的差异逐渐减小。
3.
According to the relations between element diffusion distances and interface bonding quality,a series of proper processing parameters were obtained,including 1050℃/200MPa/2.
在此基础上,利用这一模型计算得出温度和时间对扩散焊接过程中元素互扩散规律的影响,结合元素扩散距离与界面结合质量之间的关系,得到耐蚀合金与碳钢可以实现界面良好结合的工艺条件:1050℃/200MPa/2。
5)  Dispersal distance
扩散距离
1.
The dispersal behavior and dispersal distance of adults of Anastatus japonicus in litchi orchard were studied.
对荔枝果园中平腹小蜂的田间扩散行为和扩散距离进行了初步研究,结果表明,平腹小蜂的活动高峰时间是在中午11:00到下午17:00,其主要在60m范围内扩散飞行,少量个体可扩散100m远,这种扩散飞行是不连续式渐进性的;距放蜂点60m以内处植株上寄主卵的寄生率与60m以外的寄生率有明显的差异,故其有效的扩散寄生范围约为60m,而方位和植株的高度对平腹小蜂的扩散和寄生行为没有影响。
2.
The soft tape measure,water level gauge OP3000 and the Global Position System-Gps72 were used to test the dispersal distance and the dispersal height of the natural enemies,Tetrastichus brontispae Fer.
采用软皮尺实地丈量,使用OP3000水准仪测量和使用地球定位仪———Gps72测定椰心叶甲的天敌———椰心叶甲啮小蜂在田间释放后的扩散距离及向上扩散的高度。
3.
94% of the weevils recaptured in the respective years were dispersed from 16 to 60 m with 150 m the farthest of the dispersal distance,which indicated that the adults of H.
采用标记释放回捕法研究萧氏松茎象成虫的林间扩散距离。
6)  Diffusive separation
扩散分离
补充资料:离散时间周期序列的离散傅里叶级数表示
       (1)
  式中χ((n))N为一离散时间周期序列,其周期为N点,即
  式中r为任意整数。X((k))N为频域周期序列,其周期亦为N点,即X(k)=X(k+lN),式中l为任意整数。
  
  从式(1)可导出已知X((k))N求χ((n))N的关系
   (2)
  式(1)和式(2)称为离散傅里叶级数对。
  
  当离散时间周期序列整体向左移位m时,移位后的序列为χ((n+m))N,如果χ((n))N的离散傅里叶级数(DFS)表示为,则χ((n+m))N的DFS表示为
  

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