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。
This theory has better accuracy than the conventional z-scan theory because the approximate conditions are only thin sample and small non linear absorption 該理論的近似條件只要求薄樣品和小非線性吸收,比傳統(tǒng)理論具有更好的準(zhǔn)確性。
Abstract : the more detailed mathematial derivation and analysis of watson transformation in diffraction theory of ground wave is made by two different method . in derivation necessary and approximate conditions requred to make the transformation are specially discussed 文摘:采用兩種不同的方法對地波繞射理論中的瓦特松變換問題做了較詳細(xì)地數(shù)學(xué)推導(dǎo),并著重討論了做瓦特松變換的要求的必要條件與近似條件。
The same conclusion as derived from the original pda under approximate condition is concluded this way without any approximations . the second method is the instant-state performance prediction based on the hyca method . this method not only gives the off-line recursive error variance relation, but also gets a series of performance measurement such as track life 然后應(yīng)用兩種方法對其進(jìn)行性能估計和預(yù)測,一是基于riccati方程的穩(wěn)態(tài)性能估計,其結(jié)果與pda算法近似條件下得出的結(jié)論相同;二是基于hyca方法的瞬態(tài)性能預(yù)測,不僅給出了誤差方差的離線遞推關(guān)系,而且得到了航跡壽命等一系列性能指標(biāo)的估計值。