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Acknowledgments This research work was partially supported by materials science research center, Faculty of Science, Chiang Mai University.
Materials Chemistry and Physics 212 (2018) 131-137
Materials Chemistry and Physics 212 (2018) 131-137
Journal of Power Sources 175 (2009) 657-897
Materials Chemistry and Physics 211 (2017) 13-17

Fernández et al. [13] selected MeOH/H2O solvent mixture as extracting agent to extract arsenic in marine materials.
Application of fast ultrasound water-bath assisted enzymatic hydrolysis–High performance liquid chromatography–inductively coupled plasma-mass spectrometry procedures for arsenic speciation in seafood materials [J].
Arsenic extraction in marine biological materials using pressurised liquid extraction [J].
Journal of Chromatography A, 2008, 1215 (1–2): 15–20
Journal of Chromatography A, 2007, 1173 (1–2): 44–51

The artery and plaque used in the FEM were simplified into homogeneous, isotropic and incompressible materials [9].
S., J Hashmi, Finite-element simulation of stent expansion, Journal of Material Processing Technology, 2002, 335-340 [2] Rankin, J.
D., Simulation of In Vivo Loading Condition of Nitinol Vascular Stent Structures, Computer & Sciences, Vol.64, No.5, 2000, 1005-1011 [7] David Chua, S.
J., Finite Element Simulation of Stent and Balloon Interaction, Journal of Materials Processing Technology, 2003, 335-340 [8] David Chua, S.
J., Effects of varying slotted tube geometry on its expansion behavior using finite element method, Journal of Materials Processing Technology, 2004, 1764-1771 [9] Auricchio F., Loreto MDI, Sacco E., Finite-element analysis of a stenotic artery revascularization through a stent insertion.

Depending on expanding population and its increasing purchasing power we are forced to use more and more renewable resources for a production of materials.
At present, a use of thermoplastic matrices (especially with WPC materials) is preferred.
In case of machining the composite materials that are WPC based, this statement does not apply because the shape of the surface is conditioned by the compatibility of the material.
Grueneberg, et al., Influence of various wood madifications on the properties of polyvinylchloride/wood flour composites, Journal of Applied Polymer Science. 125 (2012) 308-312
Matuana, Influence of photostabilizers on wood flour-HDPE composites exposed to xenon-arc radiation with and without water spray, Polymer Degradation and Stability The new Science of Strong Materials (or why don`t fall through the floor), second ed., Princeton University Press, New York, 1984

The main conclusion is that when the thickness of micro-beam is close to the characteristics size of the materials, the natural frequency will show a significant scale effect phenomenon.
Then considering the characteristic length of the selected materials, it goes on to explore the relationship between the micro-beam thickness and natural frequency and analyze the remarkable scale effect of the natural frequency embodied in the micro-dimension.
In particular, the quantitative analysis model between the natural frequency and the intrinsic characteristic length of micro-beam materials is established.
A microbend test method for measuring the plasticity length scale :Acta Mater Vol.46(1998),p. 5109 Acknowledgement This work is supported by National Nature Science Foundation of China under Grant No. 10972056 and Natural Science Foundation of Fujian Province under Grant No. 2008J0141 Author Biographies Meiqin Chen(1984-),female, a master of machine design and theory.
The main study field is mechanics of MEMS and micromechanics of materials.

Process improvement, quality control, materials, mould, processing, heat treatment, packaging and management needed for quality assurance; Cost for quality training, appraisal and information tracking.
Cost for inspection of raw materials, process, finished products, depreciation and maintenance of equipment;Cost for experimental materials, fuels and power, and labor employment.
Size of original bar materials needed for forging of piston products is nonstandard specifications.
However, the materials are wasted; subsequent processing working technology is heavy.
Materials of piston and output shaft products are wasted, stability of process quality is poor and the cost is high.

Their characteristics, such as low densities, specific strength and specific modulus are considered superior to those of metallic materials.
Kenaf, hemp, sisal and flax are some good examples of the natural fibres that being used in composite materials.
Methodology Material.
Jeronimidis, "Partial replacement of E-glass fibres with flax fibres in composites and effect on falling weight impact performance," Journal of Materials Science, vol. 40, pp. 3581-3585, 2005
Hermanson, and I Ghasem, "Tensile properties of wood flour/kenaf fiber Polypropylene hybrid composites," Journal of Applied Polymer Science, vol. 105, pp. 3054-3059, 2007

The researcher has focused upon considering types of mould materials, because they need efficiency properties.
Moreover, it was found that chip from milling processes in the same conditions of both materials was significantly different.
Journal of Materials Processing Technology.Vol.162–163,200,pp. 696–701
Journal of Materials Processing Technology.
International Journal of Mechanical Sciences.Vol.51,782–789

Common materials undergo a transverse contraction when stretched in one direction and a transverse expansion when compressed, which is called positive Poisson's ratio of material, such as Poisson's ratio of rubber is 0.475; in contrast, some materials undergo a transverse expansion when stretched in one direction and a transverse contraction when compressed, which is called negative Poisson ratio material, also called the auxetic materials, such as Poisson's ratio of yellow single crystal iron ore is -0.14.
Poisson's ratio is general in the range of -1 to 0.5 for isotropic continuous materials.
Nowadays, researchers have found and manufactured many kinds of auxetic materials, such as auxetic rock, foams, polymers, composites and so on.
Mechanics of Materials, 2011(43): 476-486. ][[] Wright JR, Burns MK, James E, et al.
The core materials were spandex filaments with three different diameters, and the wrap materials used were nylon filaments with the same count but different tensile modulus.

Methodology Raw Materials.
Part 2; Thermal Degradation And Materials Properties, Prog React Kinetic And Mechanism, Science Reviews, vol 34, pp 1-43, (2009)
Anika Zafiah, Polymer from Renewable Materials, Science Progress, vol 3, 93, 1-16 available online; www.scilet.com/DB/SPROG (2010)
Acoustical Materials Workshop.
Australain Journal of Basic and Applied Sciences, 3(4), pp 4610-4617 (2009)