When density of precipitated slurry is too high, because of the collision among particles, big spindly aggregates which are made of ultra-fines are born in reactor at the action of surface energy.
当体系中浆液密度较高时，颗粒由于相互间的碰撞在表面能的作用下团聚成纺锤形的大颗粒。
The aggregates, composed of the primary particles, retain sufficient water and nutrients.
由原颗粒组成的团聚体要能保持充分的水分和养分。
By using silver nano-aggregates as SERS substrates instead of dispersed silver particles, a great improvement of SERS signal intensity is achieved.
通过利用银纳米粒子聚集体代替单分散的银纳米粒子作为SERS基底，SERS信号得到明显增强。
Based on those assumptions, the size of particles is simulated, and the effects of flame temperature and the flow rates of oxygen on the sizes of particles and aggregates have been calculated.
在这些假设基础上对颗粒尺寸进行了预测，模拟结果显示该模型对颗粒尺寸的预测与实验数据相差不大。文中还分析了火焰温度，氧化剂流量等对生成颗粒尺寸的影响。
These are loose aggregates of a large number of primary particles of crystalline or spherical shape.
这些是大量晶体，或球原始粒子的疏松团粒。
The structure of the carbon aggregate particles is simulated with the fractal theory and the problem of the electromagnetic absorption by the soot aggregates is discussed.
利用该方法研究了煤烟凝聚粒子的散射问题，讨论了分形煤烟凝聚粒子的散射强度随凝聚粒子的形状、结构、相对折射率及入射波波长变化的情况。
The structure of the carbon aggregate particles is simulated with the fractal theory and the problem of the electromagnetic absorption by the soot aggregates is discussed.
利用该方法研究了煤烟凝聚粒子的散射问题，讨论了分形煤烟凝聚粒子的散射强度随凝聚粒子的形状、结构、相对折射率及入射波波长变化的情况。
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