本文叙述了TIG电弧的一个较好的数学模型化研究方法。采用数值解的方法着重计算了各种条件对电弧中等离子流的影响。
A better research method for mathematic modelling of TIG arc is described, which puts emphasis on calculating the effects of various conditions on the plasma jet using numerical solution.
研究人员应用一个数学模型来计算物种的堆积速率，也称之为多样化率。
The researchers applied a mathematical model to calculate the rate of accumulation of species, also called the diversification rate.
他给这一地图起了一个富于想象力而又很数学化的名字“社会图”，它是一个由节点和连接节点的线组成的数学模型，其中节点就是一个个的人而人与人的连线则代表他们的友谊。
The fancy mathematical name he has for this map is a “social graph”, a model of nodes and links in which nodes are people and connections are friendships.
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