A needle dust as the model of the intergalactic dust is emploied, which is used to explain the reason why the supernova light tracks intergalactic space do not redden obviously.
建立了星系际尘埃的针型模型，该模型能很好地解释高红移超新星的星光通过星系际空间时没有产生明显红化效应的原因。
Grounding on the condition of force acting on the fluid in the syringe needle, a simple evaluation model is attained for the flow rate and the dot volume.
针对针尖胶体的受力情况，建立了一个简单的流量或胶点体积估计模型。
The force model of the jig needle bar in the process of grinding diamonds were analyzed, and the calculation formula of grinding force was established.
分析了宝石磨削过程中的夹具针杆的受力模型，建立了基于因次解析法的夹具针杆磨削力计算公式。
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