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And it obtained that the roadway deformation not only by mining impact, but also considering the geological environment surrounding rock conditions, tunnel position in which layers of rock, rock properties and other factors.
In the workface mining later, resulting in a number of roadway and chamber groups affected by exploiting coal seam[4-6].
So the 11-2 waste belt conveyor roadway vertical stress is the main factor of the sidewall deformation, it is shown in Fig.4.
It could be found in the deep mining, the roadway surrounding rock shown the complex rheological behaviors, and the lithology and mechanical parameters largely determined the deformation of the roadway.
Therefore, it would to control the deformation that could not only retain the large protection pillar sizes, but also should consider various factors, such as the lithology, water and other factors.

The researches had shown that the protect properties of the ceramic coating to the substrate material were closely related with its structure and phase composition, and essentially were dependent on the electrolyte composition, electrical parameter and other process conditions [4-6], of which voltage parameter was an important factor[7,8].
Discussion The micro-arc oxidation process includes two stages, that is initial oxidation film formation and ceramic coating growth, in which the thermochemistry, electrochemistry and plasmachemistry actions are direct effect factors to formation, growth of coating as well as morphology, structure of coating, just through these factors the voltage parameters affects micro-arc oxidation process.
Matthews “Thickness effects on the mechanical properties of micro-arc discharge oxide coatings on aluminum alloys” Surface and Coatings Technology, Vol.116-119, 1055-1060, September 1999 [3]J.A.
Clyne “Thermo-physical properties of plasma electrolytic oxide coatings on aluminium” Surface and Coatings Technology, Vol.199, Issues 2-3, 22, 168-176, September 2005 [4]V.
Kamyshanskii “Formation of structure and properties of coatings deposited by micro-arc oxidizing on parts fabricated from aluminum alloys” Metal Science and Heat Treatment, Vol.42, Number 10, 411-415, 2000

There is considerable industrial significance to understand the nature of subsurface deformation under the machined surface for correct prediction of surface properties in machined components based upon the machined conditions and material behaviors that give rise to them.
Sometimes, improper selection of machining parameters would induce unexpected subsurface properties which would lead to the large initial wear of machined surface [1,2].
He further considered that the heat flux into the workpiece, contact time, and quenching rate are the key factors, with increasing temperature, time, and quench rate leading to a higher hardness being generated.
Plastic deformation of subsurface can create significant alteration in the mechanical properties of the material in this region as the result of elongation of the grains or strain hardening, and metallurgical (phase) changes.
The mechanical properties of machined subsurface layer are often evaluated by micro/nano hardness measurement in the region.

The mechanical properties of the Bio-board were measured.
The test for mechanical properties indicates that the rupture stress of Bio-board produced with the experimental conditions were 6.23MPa~16.95MPa and 8.6~23.5 times greater as compared with the polystyrene plastic used in food container.
Cellulose is hydrophilic and insoluble in water with the properties of highly resilient and impact resistant [10].
The properties of Bio-board depend on process conditions, moisture content of Bio-board, physical property of raw material.
Two pieces of Bio-board were produced and their properties were investigated by tensile test

Vegetal fibers, due to their renewable aspect and their mechanical properties are important candidates to achieve excellence in the use of geotextiles.
The degradation effect is analyzed based on the mechanical behaviour of each fiber type after exposition to the degradation factors.
Moreover, the fibers have been subjected to natural degradation factors and to lab aging agents, using a QUV equipment.
Some of the properties of these fibers are shown in Table 1.
Indutrial Applications of Natural Fibres: Structure, Properties and Technical Applications, John Wiley & Sons, Ltd, 2010, pp. 10–48.

Analysis on Measuring Circuit of Pressure Difference Sensor with Magnetic Fluid Rui-can HAOa, Hua-gang LIUb, Wen GONGc and Jin-ru MA School of Mechanical Engineering, Beijing Polytechnic, Beijing 100176, China ahaoruican@163.com, bliuhuagang999@126.com, cgongwen119@yahoo.com.cn *Rui-can HAO Keywords: measuring circuit; pressure difference; sensor Abstract.
Due to many sensing properties, magnetic fluid is used in a novel application--sensor.
The power frequency and the input voltage are the two important factors for the measuring circuit.
Introduction Magnetic fluid has many properties such as fluidity, magnetism, buoyancy principle, and so on.
Determination of Power Frequency The power frequency affects the output voltage of the circuit directly, so the selection of the power frequency determines the sensitivity of the pressure difference sensor with magnetic fluid.

Materials obtained by using of two spacers, have been analyzed in order to value different results in porosity, microstructural and mechanical properties.
One of the most common is in the field of biomedicine, which is well-known to be a biocompatible material with good corrosion properties and appropriate mechanical properties [1].
Mechanical properties and elastic modulus of porous materials has been characterized.
The mechanical properties depend on porosity, decreasing when porosity increases [13].
Ashby: Cellular Solids: Structure and Properties.

On the other hand, one of the input factors for the electrical discharge machining is the workpiece material machinability.
As a rule, the machinability is the technological property of the workpiece material to be machined in the best conditions for the producer; this means that the material could be machined with high material removal rate, with a low wear of the tool, with a minimum mechanical solicitation of the machining equipment, with obtaining a low roughness of the machined surface, with a convenient form of the detached chips.
It is expected that during the electrical discharge machining, the electrode wear is influenced by various factors; these factors could be grouped in factors which characterize the workpiece material (the melting temperature, the vaporizing temperature, the thermal conductivity, the thermal capacity), the values of the machining electrical parameters (pulse frequency, duration of the electric pulse, duration of the pause between two successive electric pulses, mean value of the electric intensity), the characteristics of the dielectric fluid and the way in which the electric fluid accedes in the work zone (by immersion, through the electrode, by injection or suction), the way in which the particles of detached material from electrodes are removed from the machining zone, the motions specific to the machining schema.
Being a factor of main technological interest, the electrode wear was a subject of the researchers preoccupations.
He considered that the electrode wear could be appreciated by means of two measurements, namely the end wear and the corner wear [4]; he formulated also the opinion that due to the use of transistorized, pulse-type power supplies, the electrolytic copper could be preferred as electrode material, due to its favorable properties from the requirements of technological interest.

At present, the research on the properties of rubber asphalt mostly focuses on high and low temperature properties, thermal aging and UV aging.
Generally, LVE is determined by rubber asphalt, loading temperature, frequency and other factors, higher the modulus, smaller the value of LVE.
Evolution of the Structure and Properties of Crumb Rubber Modified Asphalt in Aging Process.
Study on Properties of Ultraviolet Aged Rubber Asphalt.
Research on Technical Properties of High Viscosity Rubberized Asphalt Modified with Compound.

Room temperature mechanical properties of the used titanium alloy were listed in Table 1.
Table 1 Room temperature mechanical properties of the Ti-Al-Mo-V-Nb-Cr alloy.
Testing performance σb/MPa σp0.2/MPa δ0.5/% ψ/% αku/J·cm-2 KIC/MPa·m1/2 Tensile properties 1432 1390 8.7 27.7 / / Impact properties / / / / 24 / Fracture toughness / / / / / 48 Experimental Results and Discussion True Stress-true Strain Curves.
The deformation temperature and stain rate are crucial factor in flow stress during the hot deformation.
Investigation of dynamic mechanical behavior and damage characteristics in TC32 alloy.