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11hours銅蟲 (小有名氣)
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[求助]
什么是 first order approximation?
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| first order approximation 是什么意思?第一近似么?麻煩詳細(xì)解釋一下。 |

銅蟲 (小有名氣)
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文獻(xiàn) 《Numerical Analysis of Hydrogen Transport Near a Blunting Crack Tip》 作者 P.Sofronis 等 語境 討論H擴散通量勢函數(shù)中應(yīng)力勢函數(shù)部分。應(yīng)力部分的勢函數(shù)等于平均應(yīng)力乘以H偏摩爾體積。下面跟的這一句“the assumption of dilational distortion is known to be correct to a first order approximation (Hirth, 1977 )” |
銅蟲 (小有名氣)
銅蟲 (小有名氣)
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維基 order of approximation In science, engineering, and other quantitative disciplines, orders of approximation refer to formal or informal terms for how precise an approximation is, and to indicate progressively more refined approximations: in increasing order of precision, a zeroth order approximation, a first order approximation, a second order approximation, and so forth. Formally, an nth order approximation is one where the order of magnitude of the error is at most xn, or in terms of big O notation, the error is O(xn). In suitable circumstances, approximating a function by a Taylor polynomial of degree n yields an nth order approximation, by Taylor's theorem: a first order approximation is a linear approximation, and so forth. |
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