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One of the materials having the mentioned properties are semimetals.
As well, THz detectors may be integrated into different security systems to detect dangerous or illegal items and materials [10].
Thus, this permittivity tensor corresponds to the II type of hyperbolic materials [12].
More importantly, these structures are promising alternative platform for development of hyperbolic media using natural materials.
Australian Journal of Physics 32.6 (1979): 585-628.

Experimental 2.1 Materials The material used in this study was taken from tailings of Yangla copper ore.
The chemical composition and iron phase analysis of material were shown in Table 1 and Table 2, respectively.
From Table 2, iron silicate was the main existing form of the iron minerals of materials, but it was difficult to be recovered at current technical conditions, so only hematite, magnetite and part of siderite could be recovered by magnetic separation. 2.2 Sizing analysis In order to investigate the particle size composition of sample and iron distribution in each size fraction, sizing analysis was carried out.
Considering a small amount of magnetite in materials, strong magnetic minerals should be removed before high-intensity magnetic separation in order to prevent high-intensity magnetic separator from being blocked. 2.3.1 Effect of grinding fineness on test Under the condition of low- intensity magnetic of magnetizing current of 4A, tests of the content of grinding fineness of 88.94%, 91.57%, 95.19%, 96.27% and 97.42% were carried out.
[4] Z.L.Yi,H.H.Sun,C.Li,Y.M.Sun and Y.Li:International Journal of Metallurgy and Materials, Vol.11 (2010) No.1,p.116 [5] L.Lei,X.L.Zhou,J.Y.Li,X.W.Cai and G.W.Wang:Express Information of Mining Industry, Vol.24 (2008) No.5,p.5(In Chinese)

Materials and Method: i.
This implies that a Napier grass fibre polyester reinforced material could be developed for designing light weight materials.
Engineering and characterisation of the interface in flax fibre/polypropylene composite materials.
Amin et al., Tensile Strength of Untreated Napier Grass Fibre Reinforced Unsaturated Polyester Composites 2014, Applied Mechanics and Materials, 554, 189 [10] Goud, G., & Rao, R. (2011).
Bulletin of Materials Science, 34(7), 1575-1581.

MATERIALS AND METHODS Materials The materials used are two leagues: a stainless steel and titanium used in another hip prostheses.
Methods Chemical Composition The analysis of the presence of the chemical elements present in alloys above was performed by EDS (Energy-dispersive X-ray spectroscopy) and X-ray diffractometer, Laboratory Characterization of Materials Engineering and compared their chemical compositions evidenced by the standards: ASTM F -138 to alloy stainless steel and ASTM F-1108 for Titanium alloy, such standards is shown in Table 1.
[3] ASTM E8/E8M (2009) Standard Test Methods for Tension Testing of Metallic Materials
Revista Materials Science and Engineering, v.
Revista Injury-international journal of the care of the injured, v. 31, p.

The main aim of the paper is to estimate the critical value of the applied stress for the crack propagation from sharp V-notch for two kinds of materials and different V-notch opening angles.
Two different materials were considered (polymethylmethacrylate (PMMA) and duraluminum).
Both materials were considered as linear-elastic and isotropic.
Tensile specimens with V-notches were used for numerical simulation and two different materials were considered: PMMA and duraluminum.
Knésl: International Journal of Fracture (1991), Vol. 48, p. 79-83

Introduction Magnesium used as implants materials has good biocompatibility and degradation, and it participates in metastasis in body.
Therefore, magnesium alloy used as implants materials has been studied [1,2].
Coatings materials used as implants have low strength and will be eroded and weared in body surroundings, which lead to coatings materials wasting and affect theirs longevity.
The coatings composed of Mg, MgO, CaNaPO4, Mg3(PO4)2 and amorphous materials.
Chen: Journal of Materials Engineering.

Porosity always is present in spray-deposited materials [7].
The amount, size, distribution and morphology of porosity in spray-deposited materials are dependent to a large extent on the processing conditions.
The hot extrusion, rolling and canned forging processes can eliminate porosity in spray-deposited materials, complete densification, and refine the properties of the materials.
Materials letters, Vol.38(2004), P.3084
Duszczyk, B.Mkorevaar, Journal of materials science, Vol.26(1991), P.824

The material properties of the shear ram is set to an extent with its Young’s modulus substantial large when compared to other materials in this modeling making the shear tool behaves as a rigid body.
To simulate complex material behaviors, the stated option is chosen [7].
Larger stress is required to cause fracture on harder materials.
[3] Masayasu Ishiko, Masanori Usui, Takashi Ohuchi and Mikio Shirai, “Design concept of wire-bonding reliability improvement by optimizing positioning in power devices”, Microelectronics Journal 37, 2006, p. 262–268
[4] Caiyuan Wang, “The Quality Test of Wire Bonding”, Modern Applied Science Vol 3 No 12, 2009, [5] ASTM F1269-89 “Test Methods for Destructive Shear Testing of Ball Bonds,” 1991 Annual Book of ASTM Standards, Vol. 10.04, 1991, ASTM, Philadelphia

Introduction Much research has been carried out for the last four decades in order to provide insight into the mechanism of fatigue crack propagation in metallic materials.
Experimental details Material.
[5] Newman, J.C., (1976), In Mechanics of Crack Growth, ASTM STP 590, American Society for Testing and Materials, pp. 281-301
Smith, Ed.), American Society for Testing and Materials, pp. 550-562
[7] Knapp, G.S., Beno, M.A. and You, H., (1996), Annual Review of Materials Science, 26, 693

Calculation of Valence Electron Structure of Precipitate Phases in Al-Cu Cast Alloy Chang Tian1, Ruichun Wang1, a, Runxia Li1, Rongde Li1 1Key Laboratory of Light Metal Materials and Engineering of Liaoning province， Shenyang University of Technology, Shenyang, China, 110023 a rcwang@sut.edu.cn Keywords: AlCu alloys; precipitates; Valence Electron Structure; EET Abstract.
Acknowledgments This work was financially supported by the National Natural Science Foundation (No.50874075) and the Liaoning Provincial Science and Technology Projects (No.2009221005).
Liu: Computer Applications in Materials Science and Engineering (Northeastern University Publications, Shenyang 2007)
Liu: Ordnance Material Science And Engineering.
Gerloff: Journal of materials science.