approximate vt. 1.使接近。 2.接近;走近。 3.近似,約計。 4.模擬。 5.估計。 approximate a solution to a problem 使問題近于解決。 approximate something to perfection 使某物臻于完善。 The total income this year approximates 10,000 dollors. 今年總收入接近一萬元。 approximate the motions of the stars in a planetarium 在天文館中模擬行星的運(yùn)行情況。 We approximated the distance at 100 miles. 我們估計行程距離為100英里。 vi. 近于。 His income this year approximates to 8,000 dollars. 他今年的收入接近八千美元。 adj. 近似的,大概的。 an approximate account 簡要的說明。 an approximate date 大約的日期。 the approximate estimate 大概的估計。 an approximate number 概數(shù)。 an approximate value 近似值。 adv. -ly 大體,大致。
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The water quality respond relation of input - output measurements are established by systematic theory in this paper . according to the peculiarity of hydrology and the necessity of water quality inverse problem the multi - parameter inverse problem model based on ordinary differential equation is developed . the existence and uniqueness of the solution of the ordinary differential equation about two parameters or multi - parameter are to be proved . the unstability depending on errors between monitoring data and interpolation approximate data are analyzed and demonstrated . cubic spline interpolation function , the least two multiply and positive rule method are conjoined for obtained solution of multi - parameter . the results from this algorithm indicats its efficient to the multi - parameter identification in water quality modeling 本文應(yīng)用系統(tǒng)理論,建立了水質(zhì)多參數(shù)輸入輸出之間的響應(yīng)關(guān)系;根據(jù)河流水文水質(zhì)變化特點和參數(shù)反問題的需求,建立了水質(zhì)常微分方程多參數(shù)反問題模型.根據(jù)常微分方程參數(shù)反問題的數(shù)學(xué)理論,作者給出了兩參數(shù)和多參數(shù)水質(zhì)常微分方程反問題的解的存在性、唯一性的理論證明過程和結(jié)論;還針對水質(zhì)現(xiàn)有監(jiān)測資料的測驗誤差和插值近似計算誤差造成參數(shù)反問題的不穩(wěn)定性,將三次樣條插值函數(shù)、超定方程最小二乘法和正則化算法有機(jī)地結(jié)合使用,成功地給出了水質(zhì)參數(shù)反問題的穩(wěn)定化算法.最后給出了應(yīng)用計算結(jié)果