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China 2NaiKai University School of Materials Science and Engineering.
PES membrane has incomparable advantages over other membrane materials for its excellent mechanical property, remarkable oxidation stability and thermal stability[2;3].
Experimental Experimential materials.
Journal of Membrane Science, 2018, 563:957-968
Journal of Henan Science and Technology, 2017(09):145-147

Introduction The Lennard-Jones potential energy problem is to construct the most stable form of N atoms of some material with the minimal energy structure.
Its form in mathematics is very simple: Minimize subject to (1) Where ,is the coordinates of atom .This paper is to minimize the L-J potential on ,where n = 3N. however it interests many researchers in the field of biology, physics, chemistry, mathematical optimization, computer science, and materials science.
Rubinov, “Cutting angle method and a local search”, to appear in Journal of Global Optimization
Verdini, “Computational experience with generalized sim-ulated annealing over continuous variables”, American Journal of Mathematical and Management Sciences 8 (1988) p.425-449
Vecchi, “Optimization by simulated an-nealing”, Science 220 (1983) p.671-680

Progress in Materials Science, 2021. 118: p. 100777
Progress in materials science, 2014. 61: p. 1-93
Journal of Materials Science & Technology, 2021. 77: p. 131-162
Journal of Materials Research and Technology, 2023. 25: p. 3189-3199
Materials Science and Engineering: A, 2020. 789: p. 139672

For this purpose, new materials, namely advanced high strength steels and aluminum alloys, have emerged.
Constitutive model The plastic behavior of materials can be defined by three major concepts: the yield function, the flow rule and the hardening law.
Brem, A six-component yield function for anisotropic materials, Int J Plasticity, 7 (1991) 693-712
Belhabib, Improving the characterization of a hardening law using digital image correlation over an enhanced heterogeneous tensile test, International Journal of Mechanical Sciences, 62 (2012) 47-56
Valente, Novel criteria for determination of material model parameters, International Journal of Mechanical Science, 54 (2012) 294–305

Two kinds of materials, 1# and 2# are used in this study, and the basic mechanical properties of two materials in this experiment are given in Table 2.
The relations between BHF and stiffness of materials 1# and 2# are shown in Fig.6.
Asnafi, On strength, stiffness and dent resistance of car body panels, Journal of Materials Processing Technology. 49 (1995) 13-31
Schedin, Improving the properties of exterior body panels in automobiles using variable blank force, Journal of Materials Processing Technology. 114 (2001) 168-173
Zhang, The control mechanism of stiffness of automotive shallow shells, Materials Science & Technology. 20 (2012) 131-135

Souza: Materials Science and Engineering Vol.
Qu: Journal of Materials Processing Technology Vol. 137 (2003), p. 132-137 [3] S.
Maeda: Applied Physics A: Materials Science and Processing Vol 81 (2005), p. 495-500 [5] R.P.
Kwon: Materials Science and Engineering Vol A390 (2005), p. 171-177 [6] P.
German: Materials Science and Engineering Vol A402 (2005), p. 341-348 [7] B.

Mg-doped LiMn2-xMgxO4 materials was prepared by solution combustion synthesis method[9,10], while the low-temperature flameless solution combustion synthesis was adopted to prepare Mg-doped LiMn2-xMgxO4 materials on the base of solution combustion synthesis method in this paper, and the structure of prepared materials was characterized.
XRD patterns of LiMn2-xMgxO4 materials (x=0, 0.02, 0.04, 0.06, 0.08 and 0.10) Fig.2.
SEM photographs of LiMn2-xMgxO4 materials (a) x=0; (b) x=0.02; (c) x=0.04; (d) x=0.06; (e) x=0.08; (f) x=0.10.
Correlating Capacity Fading and Structural Changes in Li1+yMn2-yO4-δ Spinel Cathode Materials, Electrochem.
Wen, et al, Study the fading mechanism of materials, Power Sources, 146 (2005) 736-740

A Study on the Phenomenological Constitutive Model of Mg-12Gd-5Y-3Zn-0.6Zr Magnesium Alloy Forming at Elevated Temperature Guang Lu 1, a, Zhimin Zhang 1,b , Yong Xue1,c , Baocheng Li1,d 1 North University of China, School of Material Science and Engineering, 030051 Taiyuan, China, axzp135464@sina.com, bforgexzp@163.com, cforgezzm@sina.com, d forgexy@sina.com Keywords: Mg-Gd-Y-Zn-Zr magnesium alloy, constitutive model, processing map, dynamic recrystallization, strain softening Abstract.
Magnesium alloy is the lightest mental material available for industrial application now, and has many good mechanical properties, such as high specific strength, excellent performance on vibration damping and electromagnetic shielding, and high specific stiffness, etc.
Experimental materials and methods Mg-12wt%Gd-5wt%Y-3wt%Zn-0.6wt%Zr alloy ingots are adopted as the materials for experiment.
Acknowledgements The present research is supported by the Natural Science Foundation of Shanxi Province, China (Grant No.2013011022-5, 2012011022-2), and Natural Science Foundation of North University of China.
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Most of the research results have shown that biochar significantly decrease N2O emissions, but the effect is dependent on feedstock materials, adding rates and soils [1].
Science in China.
Journal of Geophysical Research, 2008. 113: G02027
Journal of Environmental Quality, 2012. 41(4): 1193-202
Journal of Agro-Environment Science, 2011. 30(4):812~816

La(NO3)3·6H2O and (NH4)3PO4·3H2O were used as raw materials.
Materials Letters. 57 (2002) 822-827 [3] J.A.
Materials Chemistry and Physics 79 (2003) 30-36
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Materials Letters 61(200) 1260-1264.