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Introduction Concrete is currently the largest building materials[1], which is a multi-phase composite material, its strength depends on the interfacial strength of cement, coarse aggregate and coarse aggregate and cement between.
Building materials-construction of economical society plays [EBVOL]. (2006-02-08), China building materials network, http:Wb m.c e i.gov.
Journal of Tongji University, 2001,29 (5): 547-550
[3] Ai tc in PC，Me h ta P K．Effect of coarse aggregate characteristics on mechanical properties of high－strength concrete［J］．ACI Materials Journal， 1990，87 ( 2) : 103－ 107
China building material science and technology, 2007, (4): 17-20

Methods Materials.
The materials used in research were methylene blue and sodium dodecyl sulphate (SDS) purchased from Merck Indonesia.
Journal of Hazardous Materials, 2001.
Journal of Hazardous Materials, 2003.
Journal of Hazardous Materials, 2009. 163: p. 995-1000

Engineering Research Center Of Biomass Materials, Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010; b.
They have been traditionally used as a source of energy, but for the last 20 years, intensive efforts have been devoted to incorporating lignin preparations into useful polymeric materials [3].
However, because it was remarkably difficult to improve the compatibility and homogenous microstructure between lignin and polymer, lignin-based polymer blend materials did not utilized in plastics widely.
Acknowledgements This research was financially supported by the Fund of Engineering Research Center of Biomass Materials, Ministry of Education (10zxbk09).
Journal of Applied Polymer Science, 2001, 79, 72-79.

It is known that the sol-gel method can be used to obtain pure materials at lower temperatures.
Both materials were dissolved in absolute ethanol and tartaric acid was added to obtain a gel.
From 200 °C up to 300 °C, another weight loss is observed and it is believed due to decomposition of other organic materials.
Sun, Synthesis and electrochemical studies of spinel Li1.03Mn2O4 cathode materials prepared by a sol-gel method for lithium secondary batteries, Solid State Ionics 100 (1997) 115-125
Foucaran, Characterization of LiTaO3 thin film fabricated by sol-gel technique, Microelectronics Journal 38 (2007) 63-66.

Introduction Nanoparticles have distinct physical and magnetic properties relative to bulk materials.
Therefore nanoparticles can be applied in several areas of technological innovation, such as: optoelectronics, catalysis, microelectronics, magnetic materials, among others important applications [1,2].
Al: Journal of Magnetism and Magnetic Materials Vol. 324 (2012), p. 4011
Wan: Journal of Colloid and Interface Science Vol. 305 (2007), p. 366
Donatel et al: Materials Science and Engineering C Vol. 28 (2008), p. 509

Kim: Materials Science Forum Vol. 534-536(2007), p.1465 [2] Y.
Lu: Rare Metal Materials and Engineering Vol.36(2007) , p. 269 [3] S.
Gu: Journal of Alloys and Compounds Vol.490(2010), p. 609 [5]P.Nash: Binary Alloy Phase Diagrams, ASM International, Materials Park, OH, 1991, p. 1793 [6] P.
Smith:Phase Diagrams of Binary Iron Alloys, ASM International, Materials Park, OH, 1993, p. 433 [9] P.
Villars: Pearson’s Handbook Crystallographic Data for Intermetallic Phases, Desk edition, ASM International The Materials Information Society, Materials Park, OH, 1997, p. 1835

In this work, machine learning has been applied to predict the tensile strength of the 4D printed materials.
The morphology of the 4D printed materials was determined by scanning electron microscope (SEM).
The stimuli that can be applied to the 4D printed parts can be in form of physical and chemical interactions, in which the material has to be stimulus-responsive active materials [4].
Xie, “4D Printing: History and Recent Progress,” Chinese Journal of Polymer Science (English Edition), vol. 36, no. 5.
Suhr, “Materials Science & Engineering B 4D printing : Historical evolution , computational insights and emerging applications,” Mater.

The XRD verify the formation of the desired sensitive materials.
This high sensitivity can be attributed to the nanoscale structures such as nanorods and nanoparticles, the good choice of materials like ZnO and PbS, the appropriate synthesis process and the quality of decoration and bonding between the ZnO and PbS which have resulted in considerable resistance modulation with the gas exposure.
Morais, Development and surface characterization of a glucose biosensor based on a nanocolumnar ZnO film, Applied Surface Science. 402 (2017) 136-141
Viet, Zinc Oxide Nanorods Grown on Printed Circuit Board for Extended-Gate Field-Effect Transistor pH Sensor, Journal of Electronic Materials. 46 (2017) 3732-3737
Yanez-Limon, Paper-Based ZnO Oxygen Sensor, IEEE Sensors Journal. 15 (2015) 1246-1251

Introduction Concrete is a typical anisotropy mixture material.
Acknowledgments The financial support by the China Natural Science Foundation (5083800) and Beijing University of Technology graduate science and technology foundation (ykj-2010-3435) is gratefully acknowledged.
Cook, and Denis Mitchell: Effects of size and curing on cylinder compressive strength of normal and high-strength concretes, ACI Materials Journal,Vol.91 (1994), No.4,p.349
Aitcin: Testing high strength concrete compressive strength, ACI Materials Journal, Vol. 90 (1993) No.4, p.303
Bažant, Kwon Y W: Failure of slender and stocky reinforced concrete columns: tests of size effect, Materials and Structures, Vol.166 (1994), No.27, p.79

Thus, enterprises in online sales should highlight the advantages of cookware materials, such as emphasizing the advantages of cookware materials in web design, etc.
Acknowledgement This work is supported by National Natural Science Foundation of China (Grant No.61103100) .
International Journal of Research in Marketting, 1972, vol.14
Journal of Marketing, vol. 16(2), p.163-180, 1999
Journal of Management Sciences, vol.20(3), p. 61-67, 2007 [5] Wells, William D．