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The third is the standard for specific purpose that is formulated for the materials with specific purposes.[3] They Introduced the Risk Assessment to Evaluate the Safety of New Materials In addition to considering the structure and properties of the packaging materials themselves, they make a migration simulation test with their contact products to evaluate the effect of packaging materials on agricultural products and foods safety.
The migration test is used to evaluate the content level of food residue from packaging materials and is the required test of new packaging materials.
Secondly, strengthen the awareness of environmental protection, increase the investment of science and technology and develop non-toxic, harmless and biodegradable green packaging materials to insure the process from raw material purchase to product manufacturing to accord with the environmental protection requirements of import countries.
This paper is supported by Hebei Science and Technology Department project (No.13457515D) and Hebei Education Department project (No.SQ123013) of China References [1] Yan-ming Zheng and Hui-yong Li: Safety Management of Food Packaging Materials[J].
Chinese Journal of Food Hygiene,4,(2006), 342-345

The first is the development of high-performance membrane materials.
The main factors of membrane separation desulfurization are the choice of materials.
Stern: submitted to Journal of Membrane Science (2002)
Stern: submitted to Journal of Membrane Science (2008)
[12] Zhao Huijun, Zhao Shu hua, etal: submitted to Journal of Southwest Petroleum University (Science& Technology Edition) (2009)

Introduction Waterproof materials are widely used in clothing or industrial purposes, such as raincoats and tarpaulins.
The validity of the estimation method using nanofibers as porous materials has been recognized.
Hu: Structural characterization and mass transfer properties of nonporous segmented polyurethane membrane: Influence of hydrophilic and carboxylic group, Journal of Membrane Science, Vol. 274, Issue 1-2, pp. 219-226 (2006) [6] J.
Jin: Waterproof and breathable polyacrylonitrile/(polyurethane/fluorinated-silica) composite nanofiber membrane via side-by-side electrospinning, Journal of Materials Research, Vol. 35, Issue 9, pp. 1173-1181 (2020) [12] Wu, W., H.
UMEMOTO: Superhydrophobic Surface Made by Injection Molding of Polypropylene Material and its Application to Home Appliance Products, Journal of the Japan Society of Colour Material, Vol. 91, Issue 4, pp. 115-120 (2018) (in Japanese)

Reactive powder concrete (RPC) has been proposed as barrier materials for the construction of engineered barrier in a low-level radioactive waste disposal site.
Reactive Powder Concrete (RPC) is the generic name for a class of cementitious composite materials developed by the technical division of Bouygues, S.
RPC has been proposed as barrier materials for the construction of engineered barrier.
G., “Effect of supplementary cementing materials on concrete resistance against carbonation and chloride ingress,” Cement and Concrete Research, Vol. 30, No. 2, pp. 291-299, 2000
[5] Dong, J.J., Hsu, J.Y., Wu, W.J., Shimamoto, T., Hung, J.H., Yeh, E.C., Wu, Y.H., and Sone, H., “Stress-dependence of the permeability and porosity of sandstone and shale from TCDP Hole-A,” International Journal of Rock Mechanics & Mining Sciences, Vol. 47, No. 7, pp. 1141-1157, 2010.

Application of Nano-materials in Sports Engineering ZhiQiang Song1, a, YunTao Cai2,b 1, 2Hebei University Science and Technology ,China akd_szq@126.com, bkd_cyt@126.com Keywords: Nano-materials ,Sport Engineering,Application Abstract.
Compared with the conventional materials, the nano-materials have different functional characteristics that promote the rapid development of the related technologies and their broad applications.
The science of nano-materials is a field full of vitality and having the most vigorous development in China.
The Shanghai Research Institute of Sports Science, the Shanghai Water Sports Center and the Chinese Academy of Sciences, have jointly developed the nano sports clothes.
( in chinese) [15] H.Y.Chen: New Chemical Materials,Vol.35(2007)No.9,P.43( in chinese) [16] Y.F.Zhao,J.T.Chen: Aerospace Materials & Technology,Vol.5(2005)No.5,P.1( in chinese)

A=Ph-PsPs (1) Xy=PsPi (2) Lw=(Pi-Ps)/Pi (3) Water vapour permeability test: The water technique specified in ASTM E96 "Standard Test Methods for Water Vapor Transmission of Materials" [3] was followed and five tests were carried out.
Standard Test Methods for Water Vapor Transmission of Materials ASTM E96 - 00
Korean Journal of Chemical Engineering, 2059 - 2067
Journal of Engineering Tribology, 349–361
Journal of Applied Polymer Science, 55, 1317-1327

Spine LiNi0.5Mn1.5O4 (LNMO) is considered as one of the most attractive cathode materials due to its high operating voltage (at about 4.7V vs Li+) and high specific energy of 658 Wh kg-1, which is much higher than commercial cathode materials such as LiCoO2 (518 Wh kg-1), LiMn2O4 (400 Wh kg-1), LiFePO4 (495 Wh kg-1), and LiCo1/3Ni1/3Mn1/3O2 (576 Wh kg-1).
The structural properties and electrochemical performances of the as-obtained materials are investigated and reported below . 2 Material and Methods 2.1 Synthesis and characterization Li2CO3 (99%, Aladdin), MnO2 (90%, Aladdin), NiO (99.9%, Aladdin), and Nd2O3 (99.9%, Aladdin) were used as raw materials.
Chiang, Science, 330, 1485 (2010) [2] J.M.
Tong, Materials Chemistry and Physics, 2013, 138: 716–723
Nan, Chemistry of Materials. 2015, 27: 7734−7742 [23] Y.

Cordierite-mullite multiphase ceramics material has been produced from various starting materials [6].
There are many methods which could improve properties of ceramics materials, the most effective way is the use of additives.
These apparent porosities became some fracture sources which could severely decrease the flexural strength of multiphase ceramics materials.
According to the theory of thermal shock damage, the critical thermal shock resistance of materials was directly proportional to the materials' strength, but the ability of crack propagation was inversely proportional to the materials' strength.
Chinese Journal of Structural Chemistry, Vol. 16(2), (1997), p.118 [3] X.f.

Sulfur Composite Materials Based on Sulfide Containing Industrial Waste A.A.
Goretyi, Sulfur-based construction materials, Penza, 2003, 372 p [5] V.B.
Karchevskii, Elemental sulfur: from raw material to new substances and materials, Vestnik Bashkirskogo universiteta. 2 (2004) 31-34
Ahmetova, G., Medvedeva, Technology and properties of sulfide composition materials, Materials of 8th European Congress of Chemical Engineering ECCE/1st European Congress of Applied Biotechnology ECAB September 25-29, ICC Berlin, Germany, (2011)
Lakhno, Production and investigation of properties of sulfide composite materials based on technogenic sulfur waste with titanium chloride as an activator, Research Journal of Pharmaceutical, Biological and Chemical Sciences. 6 (2016) 1614-1619

And high pure graphite electrode materials were used to avoid the entry of new pollutants.
The activated materials were mixed and filled into special mesh bag and then fixed in porous plastic rectangle box as a modular unit to facilitate the replacement and addition of reactive material in PRB when it was saturated and invalidated.
In addition, the artificial enhanced migration and treatment of multi-component pollutants in groundwater were more advantageous to the replacement and supplement of different saturated activated materials in PRB momentarily.
[2] Long Xingxian, Yang Xiaoe, Ni Wuzhong: Chinese Journal of Applied Ecology, vol.13(2002), p.757-762 (in Chinese)
[13] Ding Sa, Luo Yatian: Wuyi Science Journal, vol.23(2007), p. 53-57 (in Chinese)