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Further research in material flow condition in precision forging gear process and effective control of the influence law of the key factors on forming can provide the basis for the technology optimization and mould design [1-2].
Combined with the actual production and finite element analysis program deform, and of blank high aspect ratio for optimization design variables, through the forming force, dynamic recrystallization, mould wear of multiple criteria forging process parameters of optimization, which can improve the utilization ratio of material and the mechanical properties of the gear parts.
Using Archard wear model predicts that of wear value in die forming process, and the expression is : Where: W-wear depth; P-pressure of mould surface; V-sliding speed; a, b and c -standard constants, a, b take 1 and c take 2; K-the constant related to the material properties, take 2×10-6; H-the die initial hardness
With the temperature of surface mould increases, the surface hardness and strength are decline, which affects the mold service life.
Although slightly bigger mould wear, but it gets good mechanical properties.

When osteosarcoma is located in the iliac wing, the reconstruction is important because it may affect the weight-bearing function.
By far, titanium and its alloy are the most frequent biomaterial used as implant prosthesis due to the excellence in biocompatibility, high corrosion properties, high mechanical properties, and also low modulus elasticity compared to other metallic material such as stainless steel or cobalt-chrome alloy [17-19].
Material properties for cortical bone, titanium, and Ti-6Al-4V are assigned to the 3D model to obtain comparative study on stress and strain distribution between natural bone and the titanium iliac implant.
Properties of The Materials Used in FEM Study Property Cortical bone [21] cp-Ti [22] Ti-6Al-4V [22] Density (kg/m3) 1900 4500 4380 Young’s modulus (GPa) 17 116 114 Poisson’s ratio 0.29 0.34 0.35 Yield strength (MPa) 114 140 882 a b c Figure 1.
Other properties such as elastic modulus, toughness, bending strength or other properties such as high corrosion properties and high biocompatibility are needed to be explored experimentally [30].

Comparable to the mechanical emulsions, the ultrasound emulsions had longer stable time.
However, compared to liquid fuels such as diesel and gasoline, bio-oil’s fuel properties have some disadvantages, such as low heating value, high oxygen content, high water content, acidity and instability, which limit its application as high-grade fuels [3].
The surface tension of emulsions via HLB values under different mechanical speeds are shown in Fig.8.
They were lower than mechanical emulsification and fluctuated around 28.7 mN/m.
Surface tension and droplet size distribution were two important factors which affected the stability of the emulsions.

Furthermore, the corrosion process of the steel leads to substantial reduction of the cross-section of the rebar in concrete and, as a result, to deleterious effects on the mechanical properties of the overall structure[1].
The factors affecting the durability of concrete and their relationship were confirmed by the "Design Guideline for Durable Concrete’s Structures" of CEB European Committee for Concrete published in 1989, and the corrosion of the reinforcing steel due to chloride ions is as the main reason, which takes up 33 percent of the durability damage of concrete[2].
One of the factors is the ability to hinder the permeation, which is determined by the porosity and the pore size distribution of the concrete, and the other one is the physical and chemical bonding force.
Factors Affecting Diffusion of Chloride Ion in Mortar System[J].Journal of Building Materials, 2008,11（3）:328-333.
Influence of phosphate slag on hydration properties and pore structure of cement paste [J].

Zheng1,c 1Department of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin 300222, PR China 2Department of Industrial Engineering Texas Tech University,Lubbock,TX,79415,United States azhfuying@tust.edu.cn, bhong-chao.zhang@ttu.edu, c tjzhenghui@tust.edu.cn Keywords: Elastomeric sealing, Reciprocating sliding, Efficiency-reinforcement design, Seal failure Abstract: The high efficient, high reliability and energy-saving development of modern machinery equipments challenges the higher request for hydraulic sealing technology.
In case of alternating and reciprocating motions, together with the formation of lubricating film, the sealing interface separates a little because of the interaction of all kind of factors, and result in the shaping of leakage gate.
According to new seal design, the seal leakage, the pressure and film thickness distributing, friction and lubrication states of seal interface can be obtained and the “no leakage” roughness asperities criterions of seal can be identified by developing the seal elastohydrodynamics model and thermomechanical non-linear model According to seal ANASYS model, the main affect factors of seal and the deformation of key point can be analyzed and identified for forecasting the seal life, According to seal test, how the seal materials, work situation, oil pressure, temperature, shape and size, roughness asperities affect seal behavior can be investigated and analyzed.
This model can be used to investigate how seal geometry, seal and fluid physical properties, and operating conditions affect seal behavior.
The seal behavior of efficiency- reinforcement seal design can be test by seal experimental measurement, and identify the affect factors to elastomeric reciprocating seal ability and seal service life.

Stability of microstructure of 9-12%Cr steels/cast steels depends, among other factors, on the morphology and dispersion of precipitations and the stability of dislocation substructure.
Long term service of high-temperature creep resisting materials at elevated temperature contributes to the processes of microstructure degradation, which results in the changes in their mechanical properties [1, 2].
Fatigue life is strictly connected with the stability of microstructure, therefore, learning tendency and scope of microstructure degradation and its influence on the changes in properties during service is necessary to ensure safe operation of appliances and elements of a power unit.
The above mentioned heat treatment of the examined cast steel, according to the individual pre-study [4] and literature data [5], ensures obtaining the best correlation between strength and plastic properties.
Detailed description of the influence of ageing on the microstructure and mechanical properties of GP91 cast steel is presented in the work [8].

Introduction Sulfate attack is one of the most aggressive environments that affect the durability of concrete structures.
In spite of some valuable researches conducted to investigate the mechanical properties of mineral admixtures contained concrete, sulfate resistance under wet-dry cycle condition of these concretes are rarely found in the literature.
In addition, the wet-dry cycle environment may affect the pozzolanic activity of mineral admixture.
However, at later stage, the value appeared stronger randomness as a result of the effects of corrosion environment and properties of materials.
And the crystallization of sulfate is main factor resulting in deterioration.

Elastic modulus and mechanical strength are factors influencing the load distribution between a load-bearing bone implant and natural tissue.
Various elements are added into the CoCr alloys to improve their mechanical properties.
This limitation was overcome by the introduction of titanium and it alloys due to their excellent mechanical and biocompatibility properties.
Dąbrowski, “Modification of mechanical properties of sintered implant materials on the base of Co–Cr–Mo alloy,” J.
Niinomi, “Mechanical properties of biomedical titanium alloys,” Mater.

The CO2 emission factors of each tree species are significantly higher than other gases.
Emission factors of different tree species.
And CO2, CO and CxHy (total of CH4) emission factors (2.9624 g • kg-1, 0.4261 g • kg-1, 0.0126 g • kg-1) that they measured were similar with the three kinds of carbon gas emission factors in this paper.
The main reasons were their different physical and chemical properties and different C content, resulting in a variety of amount of different trace gases released in combustion reaction.
Carbon balance in relation to fire regimes//Fires Regimes and Ecosystem Properties.

The influence caused by chemical character factors in soils.
Because of the influence caused by chemical factors such as PH, soluble salts, ion exchange capacity, active silicon (Al) content in soil, the hydration and hardening process of stabilizer are affected, it causes the hydrates aren’t produced fully, so the strength development of stabilized soil is limited.
The research has shown that[11]: Although the chemical properties of soil sample are various, and different soil samples are also various, but the ultimate performance of these differece in the soil is only expressed on the solution of Ca(OH)2 (CH) in stabilized soil, further expressed on the effect of quantity of formed hydrates by the concentration of the CH.
Therefore, the harmful influence of various chemical factors in soil can be eliminated by measures which can enhance Ca(OH)2 concentration in stabilized soil.
The percentage of components of stabilizer and the strength of stabilized soil(qu) are listed in Tab.1( the percentage of components in Tab.1 are the mass ratio of component and wet soil), the mechanical properties of soil sample and the chemical composition of industrial wastes are list in Tab.2 and Tab.3 respectively.