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Based on the formation mechanism of amorphous particle in atomized Al-Ni-Y alloy powders, combining with the analysis of breakup modes of melt, a new approach to evaluate cooling rates of melt droplets in close-coupled gas atomization was presented.

摘 要：通过分析熔体破碎模式和非晶态颗粒的形成机制，提出一种表征紧耦合气雾化过程中熔滴冷却速率的新方法。

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。

The forming process for the high-strength, steel-base modified polyformaldehyde composite material in five-laver structure is to melt modified polyformaldehyde by heating and roll to make the melt polyformaldehyde permeate into the gaps gaps between the large-grained spherical copper powder and screw copper nails.

四层结构的钢基铜塑复合材料的成型过程，是将改性聚甲醛加热熔化，经轧制，使熔融的聚甲醛渗透到大颗粒球形铜粉的间隙中，解决了三层材料复合过程中，熔融的聚甲醛水平流动性强过垂直方向的渗透性，造成了结合强度低的缺陷，使聚甲醛层与铜粉及基体结合更牢固，提高了其承载和抗剪切的能力。

The forming process for the high-strength, steel-base modified polyformaldehyde composite material in five-layer structure is to melt modified polyformaldehyde by heating and roll to make the melt polyformaldehyde permeate into the gaps between the large-grained spherical copper powder and screw copper nails.

五层结构的高强度钢基改性聚甲醛复合材料的成型过程，是将改性聚甲醛加热熔化，经轧制，使熔融的聚甲醛渗透到大颗粒球形铜粉的间隙中，解决了三层材料复合过程中，熔融的聚甲醛水平流动性远强过垂直方向的渗透性，造成了结合强度低的缺陷，使聚甲醛层与铜粉、螺旋铜钉及基体结合更牢固，提高了其承载和抗剪切的能力。

The forming process for the high-strength, steel-base modified polyformaldehyde composite material in five-layer structure is to melt modified polyformaldehyde by heating and roll to make the melt polyformaldehyde permeate into the gaps between the large-grained spherical copper powder and screw copper nails.

五层结构的高强度钢基改性聚甲醛复合材料的成型过程，是将改性聚甲醛加热熔化，经轧制，使熔融的聚甲醛渗透到大颗粒球形铜粉与螺旋铜钉的间隙中，解决了三层材料复合过程中，熔融的聚甲醛水平流动性远强过垂直方向的渗透性，造成了结合强度低的缺陷，使聚甲醛层与铜粉、螺旋铜钉及基体结合更牢固，提高了其承载和抗剪切的能力。

The growing bubbles flow upward and reach the cold-top batch layer, where the gases (CO2, SO2, NOx) collected from the melt can penetrate, but the vaporised salt desublimates at the batch particles and gets recycled into the melt.

日益增长的气泡流上升，并达到冷热门一批层，而气体（二氧化碳，二氧化硫，氮氧化物）收集到的熔体能穿透，但气化盐desublimates在一批颗粒贼回收到融化。

With the extruder moved away from the threaded substrate coating line, the extrusion condition are lined out and the die lip adjustments made to give a uniform melt at the desired output rate, die lip opening and melt temperature.

随着挤压机移离螺纹基片涂装生产线，就能达到挤压条件，模具口的调整能在理想产出率的上提供一个统一的熔体，即模具口开放和熔体温度。

When injected in the screw head melt pressure built up by the said injection pressure; Screw that promote the speed of the melt injection velocity, flow rate that injection rate; The trip itinerary said injection, in numerical plastic with pre-trip itinerary and said measures consistent.

注射时，在螺杆头部熔体所建立起来的压强称注射压力；螺杆推进熔体的速度称注射速度，其流率称注射速率；其行程称注射行程，在数值上与预塑行程与称计量行程相一致。

A redundant control circuit comprises a pair of heater circuits for heating a hot melt adhesive hose assembly to a predetermined temperature level, and a pair of temperature sensors which are used to sense the temperature of the hot melt adhesive hose assembly and to control energization of the heater circuits in order to maintain the desired temperature level.

一种冗余控制电路，包括用于将热熔胶软管组件加热到预定温度水平的一对加热器电路，和用于感应热熔胶软管组件的温度并控制加热器电路的电压以便维持期望的温度水平的一对温度传感器。

This error can be as much as 10 C, depending on melt viscosity and flow rate. Normally, this is usually ignored as most extruders are more interested in comparative readings than absolute ones, but for the chemical reactions like cross-linking or foaming, a more exact value may be needed, and the amount of shear heating may need to be known. It is a relative simple thing to do - when the machine is to be shut down, stop the screw without reducing speed or barrel conditions and watch the drop in melt temperature over the first 10-20 seconds, or until it begins to level out again.

通常在大部分关注相对读数的挤出机上，这些偏差可以忽略；但如一些挤出反应如交联、发泡对反应温度要求精确，剪切产生的热量需要知道，有一个相对比较简单的办法：但关闭机器的时候，并不降低主机转速或者筒体温度，在第10-20秒时，或者直到熔体温度达到平衡时，观察熔体温度下降了多少。

Objective: To study the effect of polycythemia on blood oxygen saturation.

裴蕾目的：观察RBC剧增而引起的高粘血症对血氧饱和度的影响。

Based on SIMPLER algorithm in the curvilinear body-fitted coordinates, the calculations were performed for Pr=0.7, Re=10~1000 on non-orthogonal non-staggered grids which are generated by elliptic equation systems.

采用曲线坐标系下压力与速度耦合的SIMPLER算法，数值研究了周期性渐扩渐缩波纹通道内脉动流动与换热情况，流动Re数的范围为10~1000，Pr数为0.7。