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The result show that at different brightness the retroreflective light present unlike spectrum distribution, and white, blue material with higher retroreflection value under mesopic vision, red material own lower value, this phenomenon is more apparent with the decrease of brightness.
Introduction With the increasing attention on safety and security, retroreflective materials are used more widely in traffic, vehicle and so on.
According to CIE 54.2-2001[1], JT/T 690-2007[2] and other national/foreign standards or technical reports, the coefficient of retroreflection of materials were recognized as the most important parameter.
[4] Ikeda M S H, Mesopic luminous efficiency functions, Journal of the Optical Society of America,1981,71:280-284
Spectral luminous efficiency functions in the mesopic range, Journal of the Optical Society of America A: Optics and Image Science,1986,3(1):71-75

Ltd., China,Shaanxi,Yan’an727406 3DEBL Environmental Science & Technology Development Co., Ltd , China,Shanghai ,200127 a 86681702@qq.com, b 121239140@qq.com, c 357315944 @qq.com Key words: Weihe River ; The Water Quality; Environmental materials Abstract.
So research on the economic development of Guanzhong region has great significance to improve the Weihe River’s water quality and play the purpose of the environmental protection. 1.The concept of environmental materials Environmental materials can be defined as follows: in the whole process of the materials’ life cycle, the material had a smaller impact on the environment load in the same functional and economic conditions.
Therefore, promoting environmental materials from the source is very important to solve the pollution problem.
Zero-waste and zero-emission are important researches in the field of environmental materials.
Quaterly Journal of Economics 110(2):353一377

Dificult to Machine Materials: Fiber Reinforced Plastic Matrix Composites of Composite Materials. 2 nd MESIC, Madrid, Spain. 2007
Material Science Forum, 526 (Advances in Material Processing Technologies). 73-78. 2006 [3] A.
Journal of Materials Processing Technology.
International Journal of Mechanical Sciences 49. 983-988. 2007
Journal of Materials Processing Technology 203. 431-438. 2008

The establishment of high-performance materials made from natural resources is increasing worldwide.
Recently, there are exceptional accomplishments in green technology in materials science field via the development on natural fibers utilization due to sustainability and environment issues.
Summary PALF are mechanically sound and environmentally excellent materials in reinforcing polymer composites in manufacturing of industrial products.
International Journal of Mechanical and Materials Engineering (IJMME) volume 5 (2010), p. 68-73 [10] P.
Materials Science and Engineering A339 (2003), p. 281-285 [15] George, J., Janardhan, R., Anand, J.S., Bhagawan, S.S., and Thomas, S.: Melt Rheological Behavior of Short Pineapple Fiber Reinforced Low Density Polyethylene Composites.

Zhang, “Electrospun nanofiber: Emerging reinforcing filler in polymer matrix composite materials,” Progress in Polymer Science, vol. 75, pp. 73–107, Dec. 2017. doi:10.1016/j.progpolymsci.2017.08.002 [2] D.
Hassan, “Tensile properties characterisation of hybrid luffa/GCW fiber reinforced polymer composite,” Materials Science Forum, vol. 1111, pp. 77–82, Dec. 2023. doi:10.4028/p-tw3ujj [7] C.
Cantwell, “Damage characterisation on PP-hemp/aluminium fibre–metal laminates using acoustic emission,” Journal of Composite Materials, vol. 47, no. 18, pp. 2265–2274, Aug. 2012. doi:10.1177/0021998312457098 [8] R.
Sawawi, “The low velocity impact properties of pandanus fiber composites,” Materials Science Forum, vol. 895, pp. 56–60, Mar. 2017. doi:10.4028/www.scientific.net/msf.895.56 [17] "ASTM International", ASTM D3039.
Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials.

The biocompatibility Today, the carbon materials have been the one of best biocompatibility materials.
Espically, the carbon materials maked by isothermal chemical vapor infiltration (ICVI) had represented as artificialy heart valve materials with the highest level, and had been also applied wildly to clinic.
The artificialy heart valve and eardrum repair materials also had been studied.
The resulits show that moderate rigidity, toughness, porous and toughness of this kind of materials is perfect artificialy bone repair materials.
Journal of Biomedical Materials Research, 1998, vol.40, pp.520-529 [8] Christel P, Meunier A, Leclercq S.

Materials Science and Engineering A 485 (2008) 415-421
Journal of the European Ceramic Society 33 (2013) 423–432
Journal of Materials Research 25 (11) (2010) 2150-2158
Journal of the European Ceramic Society 26 (3) (2006) 337-341
Composites Science and Technology 64 (2) (2004) 155-170

Journal of Analytical Science, 2001, 17(5):430-436
Journal of Regenerative Resource, 2006, 5:53-56
Thermal Analysis for Energetic Materials[M].
Beijing, Science Press, 2008
Journal of Explosives & Propellants, 2007, 30(4):76-80

The Biological materials energy stays at the top of renewable resources.
The Chinese Government and relevant departments attach great importance to the use of Biological materials energy and the National Science and Technology Commission has taken the research and application of Biological materials energy technology as a key research project in continuous three national five-year plans.
Development of Biological materials energy mainly uses the biogas technology, Biological materials pyrolysis gasification technology and biomass liquid fuel technology and so on.
Development measures of Biological materials energy Based on the prospects for the development of Biological materials energy, we put forward the following measures.
Size distributions of polycyclic aromatic hydrocarbons-gas/particle Partitioning to urban aerosols[J].Journal of Aerosol Science,1999,30:759～770

Biomimetic materials are a new class of materials that copy the structure and architecture of wildlife.
The copying of the structure of a butterfly's wing, gecko legs, human bones - all this allowed to create the new materials that have already found their application.
Modern biomimetics is largely associated with the development of new materials that copy natural ones.
Modern biomimetics is largely associated with the development of new materials that copy natural ones.
The same Kevlar appeared as a result of joint work of biologists-geneticists and engineers, experts in materials.