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Preface The Brazilian Conference on Materials Science and Engineering (CBECIMAT) is the most traditional national meeting of the Materials Science and Engineering community occurring since 1974.
From the papers presented at the Conference, 400 were submitted to publication in Materials Science Forum, 315 submitted to Materials Research and 1200 as full paper in the annals of the congress.
Keywords: Network Theory, Engineering, Materials Science, CBECiMat.
Material and Methods The database used corresponded to the annals of the 19th Brazilian Congress of Materials Engineering and Science - CBECiMat, carried out in 2010.
The semantic network based on keywords of Fig. 1a (Polymeric Materials), shows the behavior presented by networks of other areas: Ceramic Materials, Composite Materials and Metallic Materials.

Earth-Science Reviews. 138 (2014) 435-53
Construction and Building Materials. 115 (2016) 93-104
Construction Materials. 160 (2007) 16
Construction and Building Materials. 159 (2018) 486-98
Journal of Geological Education. 38 (1990) 16-20

Photocatalytic removal of toxic Hg(II) ions using TiO2-modified bamboo charcoal as photocatalyst Changbin XIAa,Chunhua LIUb, Zhihua LIUc,Daoxin WUd （Changsha University of Science and Technology, School of Chemical and Biological Engineering,China 410114.）; Adsorption; Photoreduction axiachangbin@yahoo.com.cn, blch9872@126.com,clzhwcp@126.com ,ddaoxinwu@126.com Keywords: Bamboo charcoal, Titanium dioxide,Sol-Gel method,Photoreduction, Mercury Abstract: Photocatalytic removal of mercury was studied using TiO2-modified bamboo charcoal prepared with Sol-Gel method as photocatalyst, and formate as hole scavengers under UV irradiation.
Mercury is generally released into the environment through human activities such as coal burning, trash incineration,and industrial emission, including metallurgical , pharmaceutical, chemical and petrochemical industries and in pigment manufacture, electronics, batteries, dental materials, pesticides, herbicides, fungicides, insecticides bactericides, etc[1-3].Mercury is cumulatively toxic and cannot be degraded biologically or chemically.
Materials and methods Materials Absolute ethyl alcohol, AR, Anhui antell biological chemical Co., LTD.; Tetra-n-butyltitanate, CP, Enterprise group Co., LTD.; Hg(NO3)2, AR, Shantou west long chemical Co., LTD.; Bamboo charcoal, average particle size 0.355 ~ 0.90 mm.
Acknowledgements This work was financially supported by the Natural Science Foundation of Hunan Province P.R.
Journal of Hunan University of Science & Technology(Natural Science Edition)( In Chinese), Vol.24(2009),p118.

Vibro-acoustic Coupling Analysis of High Velocity Aircraft Based on Hybrid Acoustic Simulation Method Lijun Zhang1, a *, Xiaojiao Chen1, Jia Wang1 and Min Li2, 3 1National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China 2School of Mechanical engineering, University of Science and Technology Beijing, Beijing 100083, China 3Research Center for Aerospace Vehicles Technology, University of Science and Technology Beijing, Beijing 100083, China aljzhang@ustb.edu.cn Keywords: high velocity, aerodynamic noise, numerical calculation, aircraft structure.
CFD Simulation Analysis According to X-43A vehicle geometry parameters and materials, we can create a CFD simulation model, and use the LES turbulence model to set the flow rate as 7 Mach.
Acknowledgements This work was financially supported by the Fundamental Research Funds for the Central Universities of China (FRF-AS-12-003, FRF-TP-12-161A), the Special Fund of the Major National Scientific Instruments and Equipment Developed of China (No. 2011YQ14014507), the National Natural Science Foundation of China (51005015), and Beijing Municipal Organization Department Foundation for Excellent Talents of China (2013D009006000003).
Trieling: Journal of Sound and Vibration Vol.329 (2010), p. 3679 [6] L.
Li, Y Fan and Q Fu: Advanced Materials Research Vol. 655 (2013), p. 809

Experiment 2.1 Raw Materials The spherical carbonyl ironparticles(FTF-1),with a size range of 3–5um,waspurchased from Hebao Nanomaterial Co.
Table 2 Test results of tear properties samples MR1 MR2 MR3 Mass content of iron powder 50％ 60％ 70％ Tear strength (kN/m) 56.2 59.5 49.8 Table 2 shows that with increase of mass content of iron powder, the tear strength of MR elastomer decreases but still with the designing performance requirements met. 3.1.3 Dynamic fatigue properties The tension fatigue properties of the materials were tested according to GB1688-86.
[5] Lokander M，Stenberg B．Performance of Isotropic Magnetorheological Rubber Materials[J]．Polym.
[6] Lokander M，Stenberg B．Improving the Magnetorheological Effect in Isotropic Magnetorheological Rubber Materials[J]．Polym.
[7] Demchuk S A，Kuzmin V A．Viscoelastic Properties of Magnetorheological Elastomers in the Regime of Dynamic Deformation[J]．Journal of Engineering Physics and Thermophysics，2002，75(2)：396-400．

Journal Citation (to be inserted by the publisher ) Copyright by Trans Tech Publications Porous body preparation of hydroxyapatite/collagen nanocomposites for bone tissue regeneration M.
Tanaka1,2 1 Biomaterials Center, National Institute for Materials Science, 1-1, Namiki, Tsukuba, Ibaraki 305- 0044, Japan, KIKUCHI.Masanori@nims.go.jp, IKOMA.Toshiyuki@nims.go.jp, TANAKA.Junzo@nims.go.jp 2 CREST, Japan Science and Technology Corp., Kawaguchi Center Building, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan 3 PENTAX Corp., 2-36-9,Maeno-cho,Itabashi-ku, Tokyo 174-8639, Japan, daisuke.shoji@aoc.pentax.co.jp 4 Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan, hnm.mech@tmd.ac.jp, koyama.mech@tmd.ac.jp, itoso.gene@tmd.ac.jp, takakuda.mech@tmd.ac.jp, shinomiya.orth@tmd.ac.jp Keywords: Porous body, hydroxyapatite/collagen nanocomposite, bone tissue regeneration, elastic property Abstract.
Recently, these materials are also used as a scaffold material for bone tissue engineering to regenerate critical bone defects by diseases and injuries.
Biopolymers, mainly collagen, are excellent materials for tissue engineering due to their biocompatibility [8], cell affinity and biodegradability.
Conclusion The materials demonstrate excellent elastic properties compared to both ceramics and collagen materials.

Fu, CO2 fixation using MEA and CaCl2 aqueous solutions, Applied Mechanics and Materials 541 - 542 (2014) 130-133
Mullin, Precipitation of calcium carbonate, Journal of crystal growth 60 (1982) 239-250
Ben amor, Effect og Mg2+, Ca2+ and SO42- ion on precipitation kinetics and microstructure of aragonite, Annales de Chimie Science des Materiaux 33 (2008) 123-134
Feng, Bioactivity of nitric acid and calcium chloride treated carbon-fibers reinforced polyetheretherketone for dental implant, Journal of the Mechanical Behavior of Biomedical Materials (2020) 103497-103524
Yamamoto, Effect of temperature on precipitation rate of calcium carbonate produced through microbial metabolic process of bio materials, Civil Engineering Dimension 18 (2016) 103-108

Methods and materials The image analysis digital measurement process usually takes several steps and operations in order to provide a proper output.
Journal of Transcluction Technology, 2005, 4.
Seed Science and Technology, 2007, 35.
Journal of Agricultural Engineering Research, 1999, 73.
Journal of cereal science, 1999, 30.

The types of primary main dam and other four auxiliary dams are all rolled earth dams while the dam materials are loessal clay loam and loam, respectively.
The composition of prisms and layers are coarse-grained materials corresponding to the Mohr-Columb Elastic-Plastic Model.
Journal of Northwest Sci-Tech University of Agriculture and Forestry (Natural Science Edition), 2004, 32(11).
Journal of Hydraulic Engineering, 2000, (2).
Journal of Tsinghua University (Science and Technology), 2000(S1).

Experimental Material.
Journal of Southwest Jiaotong University, 2008,43(5):633-637 [3] M.M.
Materials Letters 37_1998.201–210； [6] Mustafa Toparl, Faruk Sen, Osman Culha, Erdal Celik.
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Materials Science and Engineering,A347 (2003) 21-31; [8] J.