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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

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

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.

Materials and methods Materials Sorbus sibirica was obtained from Xinbin, Liaoning province in China.
China’s basic doctor of traditional journal, 7:45
Food Science, 33(6):24-28
Food Science, 29(2): 158-162
Food Science, 32(15): 70-73

Raw Materials and Mix Proportions.
Building Materials and Decoration, 2017 (24): 2.
Construction and Building Materials, 2019, 195: 638-649
Construction and Building Materials, 2012, 36: 216-227
Frontiers in Materials, 2021, 8: 769579

In order to developes electrolyte with high ionic conductivity, the composite of ceria-based materials have been prepared [5-7], such as ceria-carbonate composites.
The prepared materials were analyzed by XRD powder method (Phillips) and continued to Le Bail method of refinement using Rietica Software to investigate their crystal structure, cell parameters and Fourier plot of its electron density.
Heinzel, Materials for fuel cell technologies.
Lee, Nano composite materials for high performance and durability of solid oxide fuel cells.
Gupta, Review Superionic Solids: Composite Electrolyte Phase- an Overview, Journal of Material Science 34 (1999) 1131-1162, [11] P.

The determinacy evaluation methods represented by the safety coefficient process exert adverse load as the definite load on the definite structure of constant resistance force, without taking into account the randomness of such loads as flood and earthquake as well as the strength of dam body and dam base materials and without considering the fact that high arch dam of statically indeterminate structure involves multi-failure-modes.
is caused by such factors as flood, earthquake, mountain slippage, upstream dam collapse, war, terrorist attack, abnormal temperature change, material aging, etc.
In view of the dispersion in the mechanical property of the dam body concrete and the dam base rock stratum as well as the material property weakening caused by water erosion, alkalization reaction, fissure expansion and concrete aging, the friction coefficient f and the cohesion coefficient C of the slip plane material should also be treated as random variables and generally be deemed of logarithmic normal distribution.
Such random events as flood, earthquake, mountain slippage, upstream dam collapse, war, terrorist attack, abnormal temperature change and material aging are the main cause for high arch dam failure.
Martin Publications/A.A.Balkema Publishers,Netherland,(2004),in press [2] The statistical data of large dams in China on http//.www.icold-cigb.org.cn [3] Melih Yanmaz, Resat Beser: Eng Env Sci, Vol.29(2005),p.309 [4] Chen Zaitie, Ren Qingwen:Journal of Nanjing University of Science and Technology,Vol.30(2006),p.718 [5] A H-sang,W H-tang.Probability concept in engineering planning and design( Metallurgical Industry Press,China 1991)