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Today, the research on metal materials has made tremendous achievements.
However, still could not escape a large number of experimental methods in studying the performance of metal materials.
Journal of BUPT ( Social Sciences Edition).2001,3(1):44-46
The Parameter Estimation and the Existent Problems Analysis of the Logistic Model: submitted to Journal of SCIENCE & TECHNOLOGY INFORMATION, 2011,(1),p169-170
Steel materials and non-ferrous materials, submitted to Mechanical Industry Press, Beijing 1981.p42

Acknowledgements This study was supported by Fujian Provincial Department of Science and Technology (Research Project,2019H6024) References [1] Velauthapillai D,Rasukkannu M, and Vajeeston P 2018 Materials Letters. 218 233-236
[11] Crouch C H, Carey J E, Shen M, Genin F Y and Mazur E 2004 Applied Physics a-Materials Science & Processing 79 1635-1641
[16] Palacios P, Sanchez K, Wahnon P and Conesa J C 2006 Physica Status Solidi a-Applications and Materials Science 203 1395-1401
[25] Kresse G and Furthmuller J 1996 Computational Materials Science 6 15-50
[32] Yang Y, Song T,Zhang X,Zhao Y,Chai J,Cheng Z, Huang X, Zhang H, Zhu W and Yang M 2020 Journal of Materials Chemistry C 8 11778-11785

Based on the gradient source representation of functionally gradient materials Qiang Li1,2, a , Mingqing Wu1,b 1Shandong Transport Vocational College, Shandong Weifang, 261206, China; 2School of Transportation Science and Engineering, Beihang University, Beijing, 100191, China; aljzylq@126.com; bwmq1977@qq.com  Keywords: functionally gradient material (FGM), grading source,function image Abstract.
Therefore, in the course of modeling, functional gradient materials are generally a one-dimensional entity model.
The information mathematical description of functionally gradient materials The material composition array: Define an array of for functionally gradient materials entity within the material composition of each.
References [1] CHENG Xiao-nong,DAI Qi-xun,ZHAO Yu-tao.et a1．Developmem of materials calculation design.journal of Jiangsu university,2003,24 (1): 15-18(in chinese) [2] Siu.Y K,Tan.S.T.”Source based” hererogeneous solid modeling.Computer Aided Design, 2002, 34 (1);41-55 [3] WU Xiao-jun,LIU Wei-jun,WANG Tian-ran.Heterogeneous material objects modeling for 3D CAD part.Chinese Journal of Mechanical Engineering,2004,40 (5):111-117.
(in chinese) [5] Zhou Manyuan,Xi Juntong,Yan Junqi.Modeling and processing of functionally graded materials for rapid prototyping.Jourmal of Materials Processing Thecnology,2004,146(3):396-402.

The biomass material of stem granule can be used as raw material in cigarette tobacco blends, and play an important role in improving the filling power of cut tobacco, reducing the harmful components of cigarettes and the consumption of raw materials [5,6].
Dielectric properties of agricultural materials describe the interaction of electromagnetic energy with the materials[8].
Materials and methods Materials.
Journal of Food Engineering, 89 (2008),p.435–440 [9] X.H.
Journal of Food Engineering,26(1995),p.409～429

This paper selects the dielectric properties of materials science, soil science, geophysics and other areas of computing model, comparative analysis of the applicability of various computational models.
Astanin: International Journal of Impact Engineering, Vol.49 (2012), p.22-30 [2] J.L.
Auriault: Mechanics of Materials, Vol.65 (2013), p.35-43 [3] J.
Thomassin: Materials Science and Engineering: R: Reports, Vol.74 (2013), p.211-232 [4] A.
Du: Journal of Computational Physics, Vol.230 (2011), p.8089-8108 [6] V.

The effect of ionization radiation on the optical materials is promising in the radiation science and air and space science.
CIGS thin films are I-III-VI2 chalcopyrite semi-conductor materials which have a high absorption coefficient, low mass and flexibility.
Brunel, Solar Energy Materials Sol.Cells. 59 (1999) [12] M.
Davis, Electronic processes in non-crystalline materials, 2nd edn.
Cimenoglu, Journal of Sol-Gel Science Technology No. 6, Springer (2013), p. 620–627

In particular, ZnO and SnO2 selected as the initial materials.
Journal of Electronic Measurement and Instrument, 2009,23(12).
Shanghai Construction Science & Technology. 2010(6). p.65-67
Physical properties of SnO2 materials .
Journal of Shandong University(Engineering Science). 2006, 36(4). p.114-117

Its material flow process is that, mining resources flow in the production process as raw materials, and then products made from raw materials access to trading market.
After purchased and used by consumers, waste materials changed from products are released to the environment, while those generated in the production are directly discharged to the environment[4].
This industry converts waste materials generated during production and utilization into reutilizing resources and products, including two processes, firstly, wastes are converted into renewable resources, then renewable resources are processed into products[5].
Jilin University Journal Social Sciences Edition, 2006(5): 43~45(in Chinese)
Journal of Guangxi Normal University (Philosophy and Social Sciences Edition) ,2009,45(3):33~37(in Chinese)

An example using Petri net to model the process which sailors transfer materials to the storage location as shown in Fig. 1 and Table 1 [4].
Transportation route optimization should consider various irregular external contours of materials, as to avoid collision between materials and the hull on the route planning.
Because in the process of materials transport, there are many factors which can effect on transport efficiency such as channel pass degree, the size of the transport vehicle and materials, queuing situation and so on.
Sillman, in: Material Handling Issues for the 21st Century, Journal of Naval Engineers Journal Vol.112, pp. 83-96, 2000 [2] S.Z.
Huang: Scientific Concept of Man-Machine-Environment System Engineering High Efficiency Silicon Solar Cells (Science Press, China 2004)

This periodical edition includes peer-reviewed papers based on results of scientific research and engineering solutions in different areas of modern engineering science.
Keywords:
Materials Science, Materials, Mechanics, Civil Engineering, Electrical Engineering, Cumputer Science, Environmental Engineering