reflectivity reflectance 中文意思是什麼
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By computer simulation and calculation, the relation between the reflectivity and the structure parameters of such gratings are presented. these results show that a glass grating can achieve antireflection over almost the whole visible light waveband for unpolarized light, while a silicon grating with a columned grid substrate also can achieve low reflectance over as a broad field of view as a tapered silicon grating structure can, but it can be fabricated more simply
理論分析發現硅基底的圓柱形網格光柵能夠在比較大的視場獲得比較低的反射率，具有特定參數結構的低反射率硅基底圓柱形網格光柵可以獲得與專為大視場設計的金字塔形網格光柵相同的視場角，但它的製作更容易，更簡單。 -
The structure and the thickness and optical constants of each layer determine the reflectance of the thin film system. we made simulation of the determination of layer thickness of thin film system from is spectral reflectivity curve. the selected algorithm includes simulated annealing algorithm, genetic algorithm, conjugate gradient algorithm and dfp algorithm
我們對不同結構的膜系進行了理論模擬，並首次引入全局優化演算法，如遺傳演算法、模擬退火法等，和超線性演算法，如共軛梯度法、變尺度法等，對膜系的光譜特性曲線進行反演，求解出其結構參數。 -
Furthermore, the absorbent ' s electroconductibility as the function of its permittivity and permeability was also uncovered. the reflectance of the absorbents was calculated, and the effects of the preparation and the thickness on the absorbing ability were discussed. in a word, the prepared ilmenite absorbents are non - magnetic materials, at given thickness used in applications, the single - layered absorbents have the minimal reflectivity of - 50db and maximal bandwidth of 5ghz
初步研究表明：鈦酸亞鐵類化合物屬于電損耗材料；在實際應用允許的設定厚度范圍內（ 2 . 0mm ） ，單層吸收劑的最小反射率（ rmin ）可達- 50db左右，最大帶寬（ ? db ）接近5個ghz ，吸波性能很好。
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