查询词典 particles

The results indicate that the cooling rate of melt droplet that can not break further depends not only on its diameter, but also on its position in atomizing chamber. As a result, the same sized particles in different positions show different cooling rates and two different kinds of microstructures. The cooling rates of melt droplets range from 104 to 108 K/s, and the critical cooling rate for glass formation of Al-Ni-Y is about 105 K/s. Moreover, the corresponding maximum diameter of amorphous particles is 25 μm, which accords well to the theoretical analysis results. The new approach, reflecting the complexity of close-coupled gas atomization objectively, is available and effective to evaluate the cooling behaviors of close-coupled gas atomization.

结果表明：在一定的工艺条件下，紧耦合气雾化存在多种破碎模式，熔滴的冷却速率因直径、雾化位置的差异，相同直径熔滴经历结晶和非晶化2种不同冷却行为；依据Al基合金粉末的粒度分布和微观结构，结合熔体的雾化过程及冷却模式，确定熔滴冷却速率的上、下限；实验得出熔滴的冷却速率为104~108 K/s，Al-Ni-Y合金的非晶化临界冷却速率为105 K/s，能形成非晶态的熔滴最大直径为25 μm左右，实验结果与理论分析结果较吻合，比较客观地反映紧耦合气雾化的复杂过程。

And the results of T-burner experiment show the residues on the tube wall of combustion chamber and percentage of large particles decrease significantly because of using the coated aluminum particles in the solid propellant.

激光点火实验初步验证了这种设想的可行性。T形燃烧器的实验结果表明，使用包覆铝粉的推进剂，燃烧室管壁残存的残渣量和残渣中大粒子所占的百分数显著减少。

It is suggested that worn surface of PEN tape by sand dust particles showed bi-fractal characteristics.Ploughing and cutting by sand particles and micro-fracture were found to be the two main mechanisms for each fractal characteristics in large and small scale.

结果表明：经过沙尘磨粒磨损的PEN薄带表面形貌表现出二重分形特征，沙尘粒子的犁沟和切削磨损及PEN材料的微观断裂是引起大尺度和小尺度区间分形特征的主要机理。

Also, we derive the formulation of electric conductivity, dielectric coefficient and modulus decay of dusty plasma by considering the collision process between charged particles and charge process of dusty particles.

利用玻尔兹曼动力学方程和尘埃等离子体的充电方程，考虑等离子体中带电粒子之间的碰撞和充电过程，推导出适合火箭喷焰环境的尘埃等离子体电导率、介电常数以及衰减系数。

PIC result shows that the alteration of spatial potential in the discharge space directly affected the distribution of the charged particles, it is just the fluctuation of potential distribution caused the density distribution of the charged particles, thus an alternating-electric field formed in the plasma space.

采用二维PIC-MCC方法对氮气对称结构射频放电进行了模拟研究，粒子模拟结果表明：放电空间内空间电势的变化直接影响了带电粒子的分布，正是电势分布的波动使得带电粒子的密度分布也出现了波动。等离子体空间内形成了交变电场。

For the following training tutorial, we have used tracks of extraterrestrial particles that were captured in the ODCE collector on the Russian space station Mir, and tracks of submicron dust particles shot into aerogel at 20 km/sec using a Van Der Graaf dust accelerator in Heidelberg, Germany.

在随后的培训指南里，我们使用的轨迹是俄罗斯和平号空间站上的ODCE收集器捕获的地外微粒轨迹，和一些使用德国海德堡&范德夫冈&尘埃加速器以20千米/秒的速度射入气凝胶的亚微米微粒的轨迹。

Polymer bonded explosives are particulate composites containing elastic particles in a viscoelastic binder. The particles occupy an extremely high fraction of the volume, often greater than 85%.

高聚物粘结炸药是一种颗粒高度填充的含能复合材料，其单质炸药晶体的体积百分含量通常达到了85%以上。

In the paper, we investigate, respectively, the unsteady transport properties of heat and moisture in enclosure under constant wall heat flux and constant wall temperature when porous particles are small and Darcy number is lower, the effect of conductivity ratio, heating conditions and other parameters on the heat transfer rate of enclosure when particles are larger and Darcy number are higher.

并分别对多孔颗粒较小时的低Da数封闭腔内的非饱和渗流与传热，及颗粒较大的高Da数封闭腔内的非饱和自然对流行为进行了数值模拟，研究了低Da数时湿分与热量在恒热流与恒壁温条件下的非稳态传递特性，高Da数时封闭腔的传热与流动特性、达西效应以及导热比、加热条件等对空腔传热系数的影响。

Comparing to the properties of adobes manufacturing by tape casting process from different grains, as a result, the larger particles within the range of nanometer may easily from the highdensity adobes. But the fine particles have better sintering properties.

但在烧结过程中，细粒度粉料表现出更好的性能，实验制备的YSZ电解质薄膜的面积比电阻在1123K，比德国D样品大幅度下降。573～1023K的阻抗谱显示出实验制备的YSZ电解质试样的晶粒、晶界和电极处的阻抗都明显降低，综合性能明显优于国外同类产品。

The findings suggest that dark matter particles interacted so that they "annihilated" each other, producing subatomic particles called quarks and their antimatter counterparts, antiquarks.

这些发现表明，暗物质粒子之间发生互相作用，互相&残杀&，结果产生了叫做夸克的亚原子粒子以及它们的反物质粒子——反夸克。

Objective:To explore the feasibility of laparoscopy in diagnosing and treating of abdominal diseases.

目的：探讨腹腔镜用以诊断腹部外科疾病及选择治疗方案的可行性。

The lifetime of nylon 1010 and nylon 1010/POSS composites decreased with increasing temperature.

热重-红外联用分析表明尼龙1010在氮气气氛下的降解产物主要为小分子的低聚物，POSS并不改变尼龙1010降解产物的组成。