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The considered problem is thus formulated as to find the optimal material density distribution that minimizes the material volume under specified displacement constraints.
The material density variable takes the value 1 in solid domain and 0 elsewhere.
Acknowledgements This work was financially supported by the Natural Science Foundation of China (Grant 51008248), the Natural Science Basic Research Plan in Shaanxi Province of China (Grant 2010JQ1008) and the NPU Foundation for Fundamental Research (JC200936).
Optimization of structural topology, shape, and material.
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Buddhi, Review on thermal energy storage with phase change materials and applications, Renewable and Sustainable Energy Reviews, 13 (2009) 318-345
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Watanabe, Effects electrode materials on freezing of supercooled water in electric freeze control, International Journal of Refrigeration, 26, (2003) 537-542
Wu, Tuning of magnetism of SrTiO3 by site-specific doping, Materials Chemistry and Physics, 160 (2015) 80-86
Zhang, Supercooling characteristics of inorganic phase change material CaCl2·6H2O, CIESC Journal, 68 (2017) 4016-4024

All materials used in this study were used as received.
Fig. 1 FTIR spectrum of synthesized urethane dimethacrilate materials.
Andreani, et al., Developmen of Dental Resinous Systems Composed of Bisphenol A Ethoxylated Dimethacrylate and Three Novel Methacrylate Monomers: Synthesis and Characterization, Journal of Applied Polymer Science 128 (2013) 725-734
Nail, et al., Properties of methacrylate-thiol-ene formulations as dental restorative materials, Dental Materials 26 (2010) 799-806
Xiaoxu, et al., Synthesis of Novel Antibacterial Monomers (UDMQA) and Their Potential Application in Dental Resin, Journal of Applied Polymer Science, (2013), DOI: 10.1002/app.39113

Laura: Journal of Sound and Vibration 178 (1994), p.563-566
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In the last few years, there has been a constantly increasing interest in neural network modeling in different fields of materials science and engineering.
Therefore the neural networks applying in material science have good prospect.
Journal of Zhejiang University Science. 2008 90 (2)：982-989
Journal of Beijing Institute of Technology，2006，15(4):478 -482
Journal of Iron And Steel Research, 2006,13(6):71—73

Figure 1 DSC spectrum diagram Figure 2 The relationship between DSC spectrum and phase diagram Experimental apparatus and materials The DSC used in the experiments is NETZSCH, DSC 200F3 (Al crucible).
The BHT purity used for the diagram measurement is 99.87%, which was purified by melting crystallization from 90% of the raw materials that provided by Jiangsu Nanjing Kowloon chemical industry.
Yang: Journal of Thermal Analysis and Calorimetry.
Vargha:European Polymer Journal.
Ren, J.K.Wang: Journal of Hebei of technology.

The light pole is stem hollow, material Q235.
Strive to design a pole that is the most efficient materials within the scope of the safety factor.
* Ji'nan Municipal Science and technology achievement transformation project(201211077), Natural Science Foundation of Shandong Province(ZR2012EEM031).
Gansu Journal of Science. 2011, 23(1): 91-95 [2] He Shan, Zhuang Biaozhong.
Analysis and structure optimization of mechanical vertical axis wind turbine based on ANSYS, Journal of Shandong University of Science and Technology, 2011, 30(5): 96-102

Materials and methods 2.1 reagent Zinc chloride, hydrogen peroxide, formic acid, sodium silicate and EDTA, such as magnesium sulfate reagent for chemical reagent. 2.2 the pulp Polar APMP pulp from shandong sun paper, after washing a backup. 2.3 the pulp chemical swelling treatment Take 15 g dry pulp in plastic bags, after joining the zinc chloride solution, Add acid to pH value adjustment, placed in the water bath pot add heat treatment, handmade rubbing with uniform dip regularly, to the processing time , using distilled water adequately to wash pulp. 2.4 the pulp bleaching Take 15 g dry pulp in plastic bags, adding the required reagent mixing bleach, placed in a water bath heat treatment, handed rub to uniform treatment on time , after a predetermined time the pulp was sufficiently washed with water.
Acknowledgements The authors are grateful for the financial support from the National Science Foundation of China (Grant No.31370580, 31070525, 31270627, 31270626，31170547),Talented Scientist of Shandong Province (BS2013HZ020), Natural Science Foundation of Shandong Province (Grant No.ZR2010CM065, ZR2011CM011, ZR2010CQ004) and Taishan Scholar Program of Shandong Province (Grant No.2605).
Journal of Biobased Materials and Bioenergy,2011, 15(2)：181-186
Effect of an optical brightening agent on the optical properties of aspen,birch and maple high-yield pulps [J].Journal of pulp and paper science,2010,35(1-2)：35-41 [3]Segal L, Greely JJ, Martin A E.
An empirical method for estimating the degree of crystallinity of native cellulose using the X-Ray diffractometer [J].Textile Research Journal,1959, 29：786-794

Modeling study of the influence of flow control devices on metallurgical effects in a large-capacity and deep bath tundish Jiao Li1,a, Guanghua Wen1,b, Ping Tang1,c and Mingmei Zhu1,d, College of Materials Science and Engineering, Chongqing University, Chongqing 400030, P.R.China alijiao@cqu.edu.cn bwengh@cqu.edu.cn ctping@cqu.edu.cn dzhumingmei@cqu.edu.cn Keywords：A large-capacity, Deep bath, Tundish, Flow field, Inclusion Abstract.
Barreto, and D.Zacharias: Metallurgical and Materials Transactions B, Vol. 32B (2001), p.615
Yan: Journal of iron and steel research International, Vol.14 (2007), p.13
Tang: Journal of University of Science and Technology Beijing, Vol. 11 (2004), 4, p.310
Journal of University of Science and Technology Beijing.

Selected saltwater and soil samples of Xiyan area as the test materials.
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