Abstract : the second scalar analysis method to calculate the di ffraction efficiency of grating was described in detail, a simple effective approximation formula to calculate the diffraction efficiency of grating was educed . diffraction efficiencies were given and compared with scalar results, rigorous vector results 文摘:詳細(xì)介紹了計(jì)算光柵衍射效率的二階標(biāo)量近似法,推導(dǎo)出一種簡(jiǎn)單有效的計(jì)算光柵衍射效率的近似公式.給出了利用近似公式對(duì)幾種情況下光柵衍射效率的計(jì)算結(jié)果,并與普通標(biāo)量法、嚴(yán)格矢量法的計(jì)算結(jié)果進(jìn)行了比較
By applying the basic theories of developing economy and working out the surplus labors in the countryside by way of scalar analysis, this article puts forward many corresponding approaches about the shifting of surplus labors in the countryside to the city concerning such aspects as population control, the improvement of people's making, the hastening of the countryside turning into cities, the development of mid-range and small industries of non-state run economy, the modulating of the industrial structure, the establishing of a labor market and the expanding the output of labors 本文運(yùn)用發(fā)展經(jīng)濟(jì)學(xué)的基本理論,對(duì)我國(guó)農(nóng)村剩余勞動(dòng)力產(chǎn)生的原因及當(dāng)前制約農(nóng)村剩余勞動(dòng)力轉(zhuǎn)移的因素進(jìn)行剖析,并運(yùn)用數(shù)量分析方法對(duì)目前我國(guó)農(nóng)村剩余勞動(dòng)力進(jìn)行了測(cè)算,進(jìn)而從控制人口增長(zhǎng)提高人口質(zhì)量、加快城市化進(jìn)程、發(fā)展中小企業(yè)等非公有制經(jīng)濟(jì)、調(diào)整產(chǎn)業(yè)結(jié)構(gòu)以及建立統(tǒng)一勞動(dòng)力市場(chǎng)和開展勞務(wù)輸出等方面提出了我國(guó)農(nóng)村剩余勞動(dòng)力轉(zhuǎn)移的相關(guān)途徑。