direction n. 1.方位,方向;范圍,方面。 2.〔pl.〕 指揮,指導(dǎo);管理。 3.〔常 pl.〕指示,命令,吩咐;用法說(shuō)明。 4.導(dǎo)演;(樂(lè)隊(duì))指揮。 5.寄發(fā)地址。 6.趨向,傾向。 Full directions inside. 內(nèi)有詳細(xì)說(shuō)明。 direction finder [detector] 【無(wú)線電】測(cè)向儀。 direction finding 定向。 direction finding station 無(wú)線電測(cè)向站。 direction for use 用法說(shuō)明。 in all directions 四面八方,各方面。 (reforms) in many directions 各方面的(改革)。 in the direction of 向…方面。 take a new direction 有新傾向。 under the direction of 在…指導(dǎo)下。
Based on the relationship between elastic constants and sound velocities in composite material and measuring very few velocities of different propagation direction , the elastic constant matrix can be calculated out 依據(jù)復(fù)合材料中聲波速度與材料彈性常數(shù)之間的本構(gòu)關(guān)系,測(cè)量不同傳播方向的少數(shù)幾個(gè)聲速,就可以得到其彈性常數(shù)矩陣。
By using bpm , the problem is reduced from a second - order boundary value problem requiring iteration or eigenvalue analysis to a first - order initial - value problem that can be solved by simple " integration " along the propagation direction 和其他模擬方法相比, bpm將二階邊值問(wèn)題簡(jiǎn)化為一階初值問(wèn)題,減小了計(jì)算的復(fù)雜性,縮短了計(jì)算時(shí)間,降低了對(duì)計(jì)算機(jī)硬件的要求。
When pure shear wave propagate in anisotropy media , even thought propagation direction is parallel to the direction of aligned cracks , experimental results exhibit that only two kinds of shear - wave velocity can be measured - fast shear wave and slow shear wave neglecting polarization direction 這個(gè)實(shí)驗(yàn)結(jié)果進(jìn)一步表明,純橫波在各向異性介質(zhì)傳播時(shí),即橫波的傳播方向與裂隙平行,無(wú)論橫波的偏振怎樣改變,只能觀測(cè)到兩種橫波速度,快橫波和慢橫波。