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The relationship between stress and permeability under tri-axial stress was analyzed on the rock mechanical experimental rig (GAW-2000).
The main control factor of permeability should be related to coal microfractures and coal compositions.
Due to the stresses of surrounding rocks, which vary with the process of coal mining/CBM exploitation, the permeability of coal reservoirs will be affected.
The main control factor of permeability should be related to coal microfractures and coal compositions.
Romm: Physical properties of fractured rocks, Nedra, Moscow (1966)

Polystyrene-based adhesives exhibit excellent adhesion, as well as physical and mechanical properties, making them suitable for application to various materials.
Experimental planning is a method used to study the simultaneous influence of multiple factors on the obtained results.
Characterization of adhesion properties between two wood plates.
Thermal properties of the adhesive film.
Thomas, Thermoplastic elastomers from blends of polystyrene and natural rubber: morphology and mechanical properties, Eur.

The block not only meets the design requirements, its physical and mechanical properties and quality also meet such standards as “Normal concrete small hollow block(GB8239-1997)”, “Lightweight aggregate concrete small hollow block(GB15229-1994)” ,and “Small fly ash hollow block(TC862-2000)”.
The mixing quality is to determine the main factors of the block stable quality, in order to ensure the uniformity of the mixture, we should divide the mixing in 3 steps.
The carbonation of fly ash concrete block usually refers to that the CO2 in the air and Ca(OH)2 in the cement react to generate CaCO3 and water in the presence of water.With the carbonation, the Ca2+ concentration in the fly ash concrete is reduced, in order to maintain the balance, Ca(OH)2 will continue to dissolve, the above process continued, resulting in the liquid phase alkalinity and the alkali would to reduce, to a certain extent, the surrounding other calcium hydration products will decompose, carbonation, thus affecting the durability of concrete.
Beijing:Goal Preparation Technology,2002. ( In chinese) [3] Danshen Shen，Zhene Chan.The cement consists of fly ash[M]. the Science & Technology Press in Shanghai,1992. ( In chinese) [4] Peiyun Chi，Feng Liang,Shikuan Lu.The Test Study of High Properties and Green Concrete With Big Ratio Fly Ash[J].Fly Ash in CHINA,2002(3)：54～55. ( In chinese) [5] Jueshi Qian.

Because there are differences in the physical and mechanical properties of soil, in different types of geotechnical media, the development of these phenomena in quantity are not identical.
Experimental methods can determine the equation of media properties, including dynamic and static compression curve σ (ε) equation.
(1) (2) Where is peak particle velocity (ft/sec), is the peak acceleration (g), f is coupling factor, c is seismic wave velocity, is the distance to the explosion (ft), W is the charge weight (lb), n is attenuation factor of soil. f is 1; c is 1000ft/s, n is 2.75, W is 500.44 lb.
One reason is that the element size affects numerical results.
This will affect the numerical results.

Milling time and rpm of mill is found to be important factors which control the final particle size.
I�TRODUCTIO� Several advanced materials have been designed in order to achieve a set of targeted mechanical and functional properties.
Among these, intermetallics are very important due to their outstanding high temperature properties.
Hence, TiAl forms during the early stage of mechanical alloying and Ti3Al forms at the later stage (after 20 hrs of mechanical milling) for the given range of composition (Fig. 1).
The presence of iron in the system can affect the mechanical properties of the composite.

The properties of the diffusion layers, namely microstructure and phase composition, have been studied.
However, zirconium, niobium and vanadium nitrides also exhibit similar protection properties [2].
Because of their outstanding mechanical, optical, electrical and magnetic properties, thin films of nitrides have been widely utilized in many industrial applications.
Protective coatings of nitrides enhance corrosion and wear resistance, optical and electrical properties and serve as diffusion barrier.
Ln D versus 1/T for nitro-vanadized AISI 1020 steel Vanadium diffusion in the vanadium nitride layer is the primary factor affecting layer growth.

During actual calculations, perforators could only contribute gravity load, therefore such presumption would not affect strength analysis of perforating gun.
Because dynamic load was not taken into account in the calculation, the hypothesis would not affect the strength calculation of the structure.
It also has good wear resistance, high tensile strength and the excellent relaxation properties.
After decreasing thickness, buckling factor decreased, but still was stable.
Sheng: Detail of CATIA Mechanical Design command(Machinery Industry Press, Beijing, China, 2009)

The material properties used in the simulation are listed in Table 1.
In conclusion, the restorations in the smaller GH groups showed better biomechanical properties than that in larger GH groups.
Implant therapy in a surgical specialty clinic: an analysis of patients, indications, surgical procedures, risk factors, and early failures. 
DESIGN FACTORS OF LUMBAR PEDICLE SCREWS UNDER BENDING LOAD: A FINITE ELEMENT ANALYSIS. 
Journal of the Mechanical Behavior of Biomedical Materials. 71 (2017) 244-249.

This assembly offers many advantages over mechanical riveting or fastening, including improved fatigue life behavior, reinitialized stiffness and strength, decreased corrosion initiated in components. [3] devoted an aluminum panel repaired with composite panels. they showed that the stress intensity factor does not increase indefinitely with the crack length for a cracked plate repaired, because it always reaches a limit. [4] devoted the fatigue behavior of notched 2024-T3 aluminum plates repaired with bonded glass / epoxy, boron / epoxy and epoxy / carbon patch. [5] Studies at different geometric shapes are used to hedge a wider damaged area.
The best of the repair depends on the bonding properties at once the adhesive-patch.
The SIF (stress intensity factor) is then reduced by the presence of the pellet.
Material properties of 2024-T3 Aluminum : Young modulus E = 72400MPa, Density ρ= 2770 Kg/m3, Poison ratio ν= 0.33.
The material selection also affects the physical and mechanical properties of the part produced.

Most of existing and historical buildings in Italy are masonry structures, whose functional and architectonical requalification usually consists of new openings in masonry walls, but, according to the above mentioned principle, these modifications need to be designed at least without significantly affecting the pre-existent structural behavior.
But at the macro-scale, usually addressed for buildings design and verification, literature, National and International Codes [1, 4, 6] reduce this complexity to panels failure macro-modes, after homogenization of constituents properties.
With regard to vertical loads, instability and cracking in presence of out-of-plane eccentricities is accounted by means of tabular methods (F Factor Method) [1, 4].
Masonry elements are modeled according to a solid continuum approach, usually performed via FEM, after application of homogenization techniques when constituents properties are experimentally evaluated [5, 8], or, more frequently, using global properties experimentally tested on representative specimens.
Following this approach, several macro-elements formulations have been proposed in the literature [12] as an evolution of simple beam elements, embodying more elastic properties and non-linear behavior for pushover analyses.