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The influence of polyvinyl pyrrodione k 30 and N,N dimethyl formamide on formation and size of the uniform α Fe 2O 3 particles prepared by microwave irradiation was researched in this article.

本文研究了聚乙烯吡咯啉酮和N，N－二甲基甲酰胺两种试剂对微波辐射制备均分散α－Fe2O3纳米粒子的影响。

An introduction is given to significance of particles bulk volume density , with detailed description of test method and computation formula of coarse particle bulk volume density and fine particle bulk volume density .

介绍了颗粒毛体积密度的意义，详细阐述了粗颗粒毛体积密度和细颗粒毛体积密度的试验方法及计算公

A four-ball machine was used to investigate the tribological properties of nano-SiO_2 particles as an additive in 500SN base oil .

利用四球摩擦试验机测定了该纳米SiO_2作为500SN 基础油添加剂的摩擦学性能。

The tribological properties of the prepared borate nano-particles as aqueous solution additives were measured by four-ball tester.

结果表明，硼酸盐纳米粒子作为水基添加剂可使水的承载能力显著提高，抗磨减摩性能也有较大提高。

The application of fractal dimension to image processing of wear particles was discussed.

探讨了分形理论在磨粒图像处理中的应用。

The thickness and fractional dimension number of the liquid-vapor interface are simulated by selecting Argon as working substance and using Lennard-Jones potential in the rectangle simulation box under the condition of 2048 simulated particles in the NVT canonical.

本文应用分子动力学模拟方法进行了汽液界面厚度和分维数的模拟研究。

Mealworms . Larger particles will grown worms make it easier to sift out frass so you don't waste food.

较大的粒子，将增加蠕虫，使其更易于筛选出frass所以你不要浪费食物。

The article in the light of international and domestic situation, introduces several universal testing methods of the particles , and highlighted on Fraunhofer diffraction theory and Mie light scattering theory granularity about test methods, as well as relevant theoretical basis.

文章根据国内外现状，介绍了目前普遍适用的几种颗粒物检测方法，并重点介绍了基于Fraunhofer衍射理论和Mie光散射理论的粒度测试方法，以及相关的理论基础。

In many of these the proton and electron have become separated, resulting in free-floating charged particles called ions.

有许多这样的质子和电子还被电离了，所以还有不少这样的被称为离子的带电粒子在飘来荡去。

And these particles could infect fresh cells and copy and paste its genes into these cells' genome.

这些病毒颗粒能够感染新的细胞，并通过复制将它的基因插入细胞的基因组。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。