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As an important material, CoFe2O4 have been found in many applications such as data storage, permanent magnets, catalysis, ferrofluids, magnetic resonance imaging, and microwave devices because of their excellent chemical stability and mechanical hardness, wear resistance and electrical insulation, moderate saturation magnetization of about 80emu/g, high electro magnetic performance and strong magnetic properties [5–8].
These ferromagnetic nanomaterials could become the new magnetic materials with the potential application in magnetic resonance imaging, drug delivery, and high-density information storage.
Acknowledgments The work was financially supported by the National Science Foundation of China (Grant No. 20871083).
Lim: Microchemical Journal Vol. 94 (2010), p. 148 [6] H.

Finite element simulation Model situation Table 1 Material and thermal characteristic value Characteristic value Foundation Ground base specific heat (kcal/kg ℃) 0.25 0.2 specific weight (kgf/m3) 2500 1800 thermal conductivity (kcal/m hr ℃) 2.3 1.7 Convection coefficient (kcal/m2hr℃) surface 12 12 Steel template 12 - Atmospheric (℃) 20 - 91 days compressive strength (kgf/cm^2) 270 - Intensities coefficient a=4.5 b=0.95 - 91 days E (kgf/cm^2) 2.7734e+05 1.0e+04 Thermal expansion 1.0e-05 1.0e-05 μ 0.18 0.2 coefficient K=33.97 a=0.605 - The finite element analysis software Midas was used to build this model, and taking the computation precision and efficiency requirements into account, the size of both ground base and foundation is 0.8×0.4×0.6m.
Analysis and Results The mass concrete structure was poured in grading, and the concrete material age and thermal characteristic value were different in different pouring stage, so the hydration heat had to analyze according to different stages.
It is difficult to analyze the hydration heat of the mass concrete structure which is consist of different material and has different heat transfer characteristics.
Acknowledgements This research was supported by the National Natural Science Foundation of China (General Program Grant No. 51179097).
Journal of Shijiazhuang Railway Institute,1999,12(9):74-76

Working medium is a multicomponent system (accounting residual air), i.e. the reacting components have random mass (materials in the reaction chamber).
Comprehensive analysis of gas media for depositing protective diffusion coatings (in Russian), Basic Problems of Material Science.
An Engineering Journal.

Research on Diaphragm Reinforcement Design of Continuous Composite Girder Bridge with Corrugated Steel Webs Wenhu Li1, a, Dalong Ren1, 2, b and Fenghua Zhao1, c 1 Changzhou Key Lab of Structure Engineering and Material Properties, Changzhou Institute of Technology, Changzhou 213002, China 2Southeast University, Nanjing 210096, China aliwh@czu.cn, bchongrdl@163.com, czhaofh@czu.cn Keywords: bridge engineering; corrugated steel webs; diaphragm; reinforcement.
Design and application of PC composite box-girder bridge with corrugated steel webs, Applied Mechanics and Materials, 71-78 (2011) 1168-1172
Zhou, Experimental research on prestressed concrete composite box girders with corrugated steel webs, Journal of chang' an university: natural science edition, 5 (2009) 64-70

So it is necessary to use finite element means to optimize the structure, which can save more materials in the situation of ensuring sufficient strength, stiffness and stability of each elment in the structure.
The input contains structure form, lifting performance(maximum lifting moment, maximum lifting weight, etc), material, limits of state variables and geometric parameters, etc.
Acknowledgments This study was supported by National Natural Science Foundation of China (50775132) and a major research program of Shandong Province (200 890 101 043).
Cai: Structural Optimum of Main Tower-Frame of Mast Crane [J], Journal of Chongqing Jianzhu University, 1996.3

Expanding Sidoroff damage model to 3D stress state, it was supposed that the damage of rock materials is a function of equivalent strain.[5-6]
Hence,the mechanical parameters of rock materials can be deteriorated by damage function related with equivalent strain[7,8].
Rock materials According to damage deterioration model of rigid rock mass and mechanical test results of rock materials, the parameters of rock materials in computation region were determined.
Advance in earth sciences(2004). ( In Chinese) [9] Ping Xu, Feng Zhang,Shuda Zhou.
Chinese journal of rock mechanics and engineering(2000). ( In Chinese)

In the future, the strain rate sensitivity of the inelastic heat fraction for both materials should be probed, therefore high speed tensile tests or Hopkinson bar tests could be used.
The Stored Energy of Cold Work, Progress in Materials Science, Vol. 17, p.5-177, 1973 [5] Macdougall, D., Determination of the Plastic Work Converted to Heat Using Radiometry.
On the strain and strain rate dependence of the fraction of plastic work converted to heat: an experimental study using high speed infrared detectors and the Kolsky bar, Mechanics of Materials, Vol. 17, p. 135-145, 1994 [7] Zehnder, A.
European Journal of Mechanics A/Solids 38, p.1-11, 2013 [9] Rosakis, P., Rosakis, A.
Journal of the Mechanics and Ohysics of Solids. 48, p.581-607, 2000 [10]Gesellschaft, VDI: VDI-Wärmeatlas. 10.

Materials and Methods Materials The PPTA hot-pressing paper was prepared with PPTA short-cut fibers and PPTA-pulp, hot pressed in laboratory.
Properties of new printed circuit board base materials [J].
Nordic Pulp and Paper Research Journal, 2010,25(4): 551-557
Insulating Materials, 2006, 39 (03): 18-22
Journal of Applied Polymer Science, 2004, 91(1): 417-424.

Science of Sintering 2017, 49 (4): 359-372
Materials Review Volume, 2016, (30):117-120
Arabian Journal of Geosciences,2019,(12):538-543
Key Engineering Materials,2018, (05):59-64
Materials Science Forum,2018,(06):4552.

When it comes to the materials, there were 2 main development directions.
Fuel cell is very complicated, which is related to theories of chemical thermodynamics, electrochemistry, electrocatalysis, material science, power system and automatic control.
The area of material: find more economic raw materials to produce chemistry batteries; find electrode materials with better stability and absorbability. 2.
Power Journal Vol 6 ( 2012) ,p.1-7 In Chinese [2] S.P.Jiang.
Science and Technology Progress countermeasure Vol5 (2013),p.74-77 In Chinese [4] Z.H.Wang,Y.H.Wang.