Spherical particles have minimum scattering area, high packing density; which is beneficial to the luminescent intensity and lifetime of the devices.
球形颗粒荧光粉的光散射面积最小，堆积密度大，有助于提高发光材料的发光强度和使用寿命。
The variation of the mass loss, packing density, surface area, distribution of pore diameter, amount of ash with the cyclical Numbers were researched.
考察了活性炭的失重率、堆密度、比表面、孔径分布及灰分含量随活化次数的增加而变化的情况。
Under low packing density, convection is significant in shell-side flow, which is preferable for the reduction of dead zone area and the higher utilization of contacting area.
较低的封装分率下，组件壳程对流作用明显，有利于减少死区，充分利用膜接触面积。
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