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The structural floors of rigid pavement consist of different materials, this article sets the basic material parameters of the model adopted, as shown in Table 1.
Table 1 Pavement structure and material parameters structural floors cement concrete surface course cement stabilized macadam base subgrade thickness H(m) 0.38 0.44 8 elastic modulus E(MPa) 36000 1500 80 density(kg/m3) 2500 2000 1800 Poisson ratio 0.15 0.25 0.35 The relation between pavement structural parameters and the fundamental frequency The influence of the thickness of surface course h1.The thickness of surface course h1 changes from 0.30 m to 0.44 m, with the interval of 0.02 m, as shown in Table 2 and Figure 1, the fundamental frequency under different thickness of subgrade decreases linearly with the increase of the thickness of surface course, but the change is very small.
Acknowledgements This work is financially supported by the National Natural Science Foundation (51178456).
Chinese Journal of Rock Mechanics and Engineering,2003，22(6):1029－1036

Optimization of a Screw Press using Linear Programming Techniques Abbas Ihsan 1, a, Riaz Ahmad2, b, and Muhammad Umer3, c 1, 2, 3National University of Sciences and Technology (NUST), Islamabad, Pakistan aabbasihsan10@gmail.com, briazcae@yahoo.com, cmuhammmad.umer@smme.nust.edu.pk Keywords: Screw Press, Linear Programming, Optimization, Oil Yield, TORATM, Objective Function, Losses.
For this study a scaled down model of screw press was used, already developed by NUST School of Chemical and Material Engineering [3].
Materials and Methods Seed Used.
The screw press fabricated by NUST School of Chemical and Material Engineering was developed for jatropha curcas seeds, provided a platform to carry out this research.
Wiyono, Performance test of a screw-press machine for extracting jatropha curcas seed into crude oil as an alternative energy source, Indonesian Journal of Agriculture 2(1) (2009) 35-40

Acknowledgements This work is financially supported by the National Natural Science Foundation of China (No.51378436) and the Development Program for Innovative Research Group under the Education Ministry of China (IRT0955).
Advanced Materials Research. 2014, Vols. 919-921: p 853-p856 [3] Zhou Xiaojun, Guo Rui.
Applied mechanics and materials. 2014, Vols. 488-489: p 390-p393 [4] Zhou Xiaojun, Yu Heran, Hu Hongyun, Wang Xiaofeng, Cao Yaodong.
Chinese Journal of Underground Space and Engineering, 2011, 7(1): p0112-p0120

Slope Ground Mass is a naturally damage the material, due to inability to accurately obtain the elastic modulus when the lossless, so the slope body forming state as the reference damage state, the surface water infiltration of slope as the n-damage state.
Equivalent strain hypothesis according to Lemaitre after injury expression derived benchmark status: D=1-E′/E Wherein, E is the intact material elastic modulus, E' is the elastic modulus of the damaged materials.
Fig.4.Zone DEF horizontal displacement curve of Zhong Long Yuan Slope Fig.6.Zone DEF deep horizontal displacement curve of Zhong Long Yuan Slope Fig.5.Zone DEF cable bearing curve of Zhong Long Yuan Slope References [1] Landslide science and landslide prevention and control technology [M].WANG Gongxian.
(In Chinese) [2] Journal of natural disasters.Yao Yuchun,Yao Lingkan,Wang Yuanxun etc.Centrifuge model test of slope failure under water’s permeation [J]. 2004.13(2).149-154.

In this paper, the recycled concrete flexural members basically force performance for different recycled aggregate replacement rate is studied by experimental. 2 Experiment Overview 2.1 Major raw materials and performance In this experiment, the Hebei Taihang brand 42.5 ordinary Portland cement is used, its measured compressive strength is 60.3 MPa; Hebei Mancheng river sand is used, its fineness modulus is 2.7 and its bulk density is 1573 kg/m3; the continuous level of 5~20 mm of Hebei Mancheng gravel is used, its gravel packing density is 1558 kg/m3; recycled coarse aggregate is made manually by the abandoned test block of Hebei construction Group, the particle size is 5~20mm which is continuous gradation.
Table1 Mixing ration of concrete R * Water absorption of recycled aggregate W/B Material usage（kg/m3） Slump constant（mm） C S natural aggregate recycled coarse aggregate W* 0% 5.6% 0.50 410 720 1089 0 205 80 30% 5.6% 0.50 410 720 762.3 326.7 223.3 95 75% 5.6% 0.50 410 720 272.3 816.7 250.7 114 Note: R* is the recycled aggregate replacement ratio which is the ratio of recycled aggregate quality with all the aggregate quality; W* is the water which includes the value calculated and the value of recycled aggregate absorption, they are added at the same time.
Fig.1 Dimension and reinforcement of beam 2.4 Experimental device and measurement content The test is done in the material structure laboratory of Hebei Agricultural University.
[3] CAO Wanlin,DONG Hongying,ZHANG Jianwei,XU Fangfang,LI Donghua ，Experimental Study on Working Performance of Recycled Concrete Structures [4] ZHOU Jinghai,ZHANG Wei,LIU Aixia3，Bend Performances of Recycled Coarse Aggregate Concrete Beam[J]   Journal of Shenyang Jianzhu University(Natural Science) 2008.05

Alloy Design and Practice of High Carbon Alloy Steels with Ultra-fine Carbide Yongqing Ma 1, a, Yang Zhang 2,b, Yumei Dai 3,c 1 Department of Materials Science,Dalian Maritime University, Dalian, Liaoning116026, China 2 ZhouShan PuTuo Marine Hi-Tech Zone,ZhouShan, Zhejiang 316000, China 3 College of Science, Shenyang University, Shenyang 110044, China amyq_dlmu@163.com, bsyzhang@newmail.dlmu.edu.cn, cdaiyumei66@126.com Keywords: High carbon alloy steel; Ultra-fine caebide; Alloy design; Microstructure; Properties; Phase-equilibrium thermodynamics; Calculation at atomic scale Abstract.
The yield strength of a steel is correlative to cohesive energy owing to direct ratio of the elasticity module and cohesive energy of material, and then the mechanical properties of the steels are guesstimated[6].
Transactions of materials and heat treatment Vol. 25 n.5 (2004), p.117-121 [2] Ma Yong-qing, Zhang Yang, Dai Yumei, Application of phase equilibrium thermodynamic method in alloy design for high carbon alloy steel with ultra fine carbides[J].
[5] Dai Yumei, Wang Xun, Dai Yujie, Ma Yongqing The theoretical calculation of the contents of Si and Ni in multi-composition alloy steel[J], Journal of Computational and Theoretical Nanoscience.

The material used for two test specimens including beams, columns, continuity flange stiffeners, was in accordance with Q235 steel.
Finite element analysis Establishment of finite element model and material parameters.
The stress-strain relation curve of steel is decided by actual testing result of materials.
Other material parameters are listed as following: the elastic modulus of steel is 1.9793×105Mpa, and the Poisson’s ratio of steel is 0.27.
International Journal of Solids and Structures [J], V41,(18-19) 2004,pp: 5003-5022.

Methodology Materials.
Table 1 Chemical composition of ingredients in cementitious materials and rGFRP.
It should be noted that the grayness of scanned images was dependent on the densities of materials, which were brighter while the materials had higher densities.
kermo, The economic and mechanical potential of closed loop material usage and recycling of fibre-reinforced composite materials, J.
Leeke, Current status of recycling of fibre reinforced polymers: Review of technologies, reuse and resulting properties, Progress in Materials Science 72 (2015) 61-99

Yeonh, 3D printing of smart materials: a review on recent progresses in 4D printing, Virtual Phys.
Rubenchik, Laser powder bed fusion additive manufacturing of metals; physics, computational, and materials challenges, Appl.
Beuth Geometric model to predict porosity of part produced in powder bed system Materials Science and Technology (2015) 129-135
Froyen, Lasers and materials in selective laser sintering Assem.
Fortuanto, Effect of selective laser melting (SLM) process parameters on microstructure and mechanical properties of 316L austenitic stainless steel, Journal of material Processing Technology, 249(2017) 255-263, [39] E.

The results show that the use of composites, in particular the bi-metallic composite, is instrumental in tailoring the plate materials to achieve non-penetrating impact.
To design such structure, it will be instructive and convenient to resort to fundamental principles and take into account the progresses in analytical and computational approaches as well as in material science and technologies.
The use of composites, in particular the bi-metallic composite, is investigated for structural tailoring the plate materials.
Since von Mises criterion is independent of the first stress invariant, it is applicable for the analysis of plastic deformation relevant to ductile materials since the onset of yield for these materials does not depend on the hydrostatic component of the stress tensor.
The present work shows that the use of composites, in particular the bi-metallic composite, is instrumental in structural tailoring the plate materials to achieve a non-penetrating impact.