valid approximation是什么意思_valid approximation中文

valid approximation中文什么意思

valid: adj. 1.(理由、证据等)有确实根据的，确凿的；正确 ...
approximation: n. 1.接近；近似。 2.【数学】近似值。 3.概算， ...
be valid for: 对…有效的
approximation: n. 1.接近；近似。 2.【数学】近似值。 3.概算，略计。 successive approximations 逐次近似计算法。 be a very close approximation to 很接近于…。
approximation approximation: 近似，逼近

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By using the yearly data of water - sand that is gotten by a couple of adjacent hydrologic station in yellow river lower reaches , this paper makes use of kinds of math methods looking for the nonlinear disturbance among all of the factors , and introduces the thinking of analysis , logic , conclusion , inference , and random to nonlinear hydrologic forecasting . it realizes the valid approximation of the water level process in erodible - bed channel
本文选择黄河下游两对相邻水文站多年水沙资料，借助多种数学方法寻找其中的非线性扰动项，将随机数学中分析、逻辑、归纳、演绎、随机的思考问题方式引入到非线性水文预报中，实现冲淤河道相应水位过程的有效拟合。

valid approximation中文什么意思