Research on Spectral Reflection Characteristics of Overprinted Color Inks and the Numeric Compensation to the Theoretical Model

2017 ◽  
pp. 49-54
Author(s):  
Ji Qi ◽  
Yang Jin ◽  
Xinggen Qian ◽  
Yusheng Lian
Keyword(s):  
Theoretical Model ◽  
Spectral Reflection ◽  
Reflection Characteristics

Spectral reflection characteristics of sea ice polluted by pulverized coal in the Bohai Sea

2020 ◽  
Vol 21 (2) ◽  
pp. 157-166
Author(s):  
Chunjiang Bai ◽  
Ying Li ◽  
Bingxin Liu ◽  
Chengyu Liu ◽  
Feng Xie
Keyword(s):  
Sea Ice ◽  
Bohai Sea ◽  
Pulverized Coal ◽  
Spectral Reflection ◽  
The Bohai Sea ◽  
Reflection Characteristics

A Composite Matching Layer with Anti-Reflection Characteristics for Broadband Acoustic Scattering Reduction

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Shande Li ◽  
Xiaoxun Wu ◽  
Jinxiu Duan ◽  
Shuai Yuan ◽  
Cun Wang ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Metal Foam ◽  
Effective Medium Theory ◽  
Acoustic Scattering ◽  
The Finite Element Method ◽  
Medium Theory ◽  
Acoustic Reflection ◽  
Matching Layer ◽  
Variation Trends ◽  
Reflection Characteristics

A composite matching layer composed of periodically arranged scatters with anti-reflection (AR) characteristics is proposed for broadband scattering reduction. The anti-reflection structure is composed of periodically arranged metal foam scatters, and it is the first attempt to be applied in the field of suppressing acoustic reflection. A complete theoretical model is developed to reveal the mechanism of scattering reduction and acoustic absorption based on effective medium theory and the transfer matrix method. The correctness and effectiveness of the theoretical model are verified by the finite element method (FEM), showing acoustic reflectance of less than 13.5% at broadband frequencies. The variation trends of reflectance are deeply investigated. The superior acoustic scattering reduction performance suggests that the matching layer possesses potential for acoustic imaging equipment and acoustic stealth.

Spectral reflection characteristics of spruce needles and leaves of trees in the zones with industrially polluted air

1997 ◽  
Vol 64 (6) ◽  
pp. 804-808 ◽  
Author(s):  
L. P. Lovchikova ◽  
S. V. Nikonenko ◽  
V. E. Plyuta ◽  
S. A. Sergeichik
Keyword(s):  
Spectral Reflection ◽  
Spruce Needles ◽  
Reflection Characteristics
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