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Most roofs on Earth are made of dark materials.
Reflective materials are also referred to as cool materials because, under the same conditions, they remain colder than standard materials due to their optical characteristics [4].
Solar Energy Materials and Solar Cells, 236, 111492
Applied Sciences, 11(7), 3263
Journal of applied polymer science, 96(4), 1126-1137

In this paper, ceramic balls, made of natural mineral materials, are chosen as activating material.
Materials and Methods 2.1 Materials and reagents Kunming mice were bought from Animal Science of Health Science Laboratory in Peking University.
Results and Discussion 3.1 Changes of parameters of water After flowing through the activating materials, the properties of water are changed by them.
Wang, et al.: Journal of Functional Materials, Vol. 40(2009), p. 556 [8] J.S.
Ding, et al.: Advanced Materials Research, Vol. 178 (2011), p. 86 [11] D.Y.

Furthermore, the pump could not work in its operating pressure resulted in significant losses in journal bearing damage and production interruption.
Under normal conditions, it would not cause corrosion to low alloy steel material[1].
The anatomical analysis shows that the grooves and pits over the sealing surface have penetrated deeply into the material.
Crater formation moves surface material to the edges of the craters, and these extrusions eventually break off, causing loss of material from the surface[4].
British Corrosion Journal 1978;13(3):104-111

The structures and material are optimized.
Optimize the structures and material.
Journal of Tsinghua University Science and Technology, 2012, 52(12): 1758-1763
Journal of Shenyang Jianzhu University(Natural Science), 2013, 29(2): 367-371
Jixie Gongcheng Xuebao(Chinese Journal of Mechanical Engineering), 2010, 46(21): 54-60

So, Ag+ is the most usually used ion in antibacterial materials [1,2,3].
Journal of Molecular Structure.
Diamond and Related Materials.
Journal of Colloid and Interface Science.
Journal of Non-Crystalline Solids.

However, its shortage is that the application of energy storage balls increases heat exchange area of phase change materials, which decreases simultaneously the heat transfer performance of phase change materials.
Acknowledgements This work was financially supported by China National Natural Science Foundation (51066001), Yunnan Province Natural Science Foundation (2008CD093) and the Talent Cultivation Foundation of Kunming University of Science and Technology (2010-010).
Vol.4 (1991), p.263 [15] S.L.Chen: ASME Journal of Solar Energy Engineering.
Vol. 368-372 (2008), p.1074 [24] X.Q.Zhu, J.Hu, N.J.Li, et al.: Materials Research Society Symposiun Proceedings.
Vol.1100 (2008), p.24 [25] X.Q.Zhu, J.Hu, Y.F.Yang, et al.: Advanced Materials Research.

The material development can provide all types of fossil fuels, metal ores, building materials and non-metallic mineral to meet the needs of region and outside region.
The natural environment system is the supply station of raw materials, and it is also the disposal sites of waste.
Classification of material stock: ①stock increase: construction and infrastructure (building materials, metals and others), machinery and durable materials (metal and other materials); ②stock reduction: the demolition of construction and infrastructure (building materials, metal and others); ③The net change of stock: the net change of construction and infrastructure inventory and others.
The physical economy of the European Union Cross～country comparison and determinants of material consumption [EB/OL]. http://www.Elsevier.com/locate/ecolecon, 3:12(2006) [4] Xiaoqiu Chen, Lijia Qiao: submitted to Journal of Natural Resources, 15 (1):17-23(2000).
(In Chinese) [5] Xiaoqiu Chen, Tingting Zhao: submitted to Peking University (Natural Science), 7 (4):538 -547(2003).

Recently, the disadvantages of one reactive material have been eliminated by a combination of several materials.
Materials and Methods CCM is a reactive material characterized by lower crystallinity of MgO.
Physico-chemical properties of reactive materials are summarized in Table 1.
Physico-chemical properties of the reactive materials.
Anousis, Thorium and uranium uptake by natural zeolite materials, Science of Total Environment Journal 173/174 (1995) 237-246

Among the semiconductor materials , zinc oxide with excellent electronic properties has been considered extremely.
Experimental Materials zinc acetate (Zn(CH3COO)2.2H2O), ethanol and sodium hydroxide were purchased from merc.
Vol. 30, No. 3, 2011 [9] Shingo Tachikawa, Atsushi Noguchi, Takeharu Tsuge, Masahiko Hara, Osamu Odawara and Hiroyuki Wada; Optical Properties of ZnO Nanoparticles Capped with Polymers; Materials; mdpi /journal /materials. 2011, 4, 1132-1143; doi:10.3390/ma4061132 [10] R.
In International Journal of Inorganic Materials, vol. 2, 2000, p. 451-454
In Science and Technology of Advanced Materials, vol. 9, 2008 [29] M.

Various types of fatty acids have been used as energy storage materials.
Organic materials consist of paraffin and fatty acid, whilst non-organics materials consist of Hydrate-Salt.
Simulation of Thermal Storage Phase-Change Material in Buildings, Word Academy of Science Engineering and Technology, 58-2009
Phase Change Material As A Thermal Energy Storage Material For Cooling of Building, Journal of Theoretical and Applied Information Techmology pp. 503-511. 2005-2008.
Phase Change Materials Based on Low-density Polyethylene/Paraffin Wax Belnds, European Polymer Journal 43(2007) 4695-4705