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For better understanding the effect of compaction factors, all the test specimens in his research have the air voids around 7% and the heterogeneity index was defined as follow: (2) Where M is the total number of vertical layers; Vi is the air void content in the ith layer and VAvg is the overall average air void content of the specimen.
Effect of Aggregate Grading on Air Voids Distribution Aggregate grading is one of the most influential aggregate characteristics and affects almost every important property of asphalt mixture including stiffness, stability, durability, permeability, workability, fatigue resistance, frictional resistance and resistance to moisture damage [19]. 
The CA ratio is the ratio of the fine part (interceptors) to the coarse part (pluggers) of the overall coarse aggregates and has significant effect on asphalt mixture volumetric properties and compactability [20].
The particle-particle contact between aggregates is a key factor in the force transmitting inside asphalt mixture.
With the help of coordination number, the force transmitting paths between aggregates can be quantitatively studied, which is very helpful to evaluate the pavement performances, like the permanent deformation, fatigue cracking, low-temperature cracking, moisture susceptibility, and friction properties of Hot Mix Asphalt pavements.

The experimental results indicate that the proposed mathematical models suggested could adequately describe the performance indicators within the limits of the factors that are being investigated.
Design and methods such as factorial design, response surface methodology (RSM) and Taguchi methods are now widely use in place of one-factor-at-a-time experimental approach which is time consuming and exorbitant in cost.
RSM is a dynamic and foremost important tool of design of experiment (DOE), wherein the relationship between response(s) of a process with its input decision variables is mapped to achieve the objective of maximization or minimization of the response properties [3].
Cutting conditions in coded factors and the surface roughness values obtained using TiN coated cemented carbide insert are presented in Table 2.
The contours affirm that surface roughness can be affected by the feed and axial depth of cut.

Surface chemistry is, in many cases, determined by the nature of the bulk material used, which depends on the mechanical properties required for the application.
All of these properties make them suitable for dental implant material.
Although no other metal can withstand the fluctuating oral conditions like gold, other alternatives alloys with suitable mechanical and chemical properties are available on the markets which are close enough to the ideal dental materials.
Ti and its alloys, so far, have proved to be the most befitting materials for biomedical applications due to their particular characteristics such as better mechanical properties, excellent biocompatibility and superior corrosion behaviour [25].
Moreover, this alloys are materials of choice in biomedical devices due to their superior properties and performance especially biocompatibility and corrosion behaviour.

Since diamond tools possess excellent mechanical properties such as extreme hardness, lower frictional coefficient, they can achieve very sharp cutting edges, which are crucial for machining precision components [7,8].
In some researches, tool path length has been found to be a major influencing factor to the total machining time.
Tools wear is also a very important factor as small tool wear may lead to significant degradation of surface quality.
Surface roughness of optical surface is a key factor, which affects the dispersion of lens.
quality and form accuracy are affected by machining parameters.

Wood and its properties The popularity of wood in construction is increasing mainly due to its qualities, which in some ways can be considered unique.
Mechanical properties of wood are affected in particular by its anisotropic character, so in a direction perpendicular to fibers are the values ​​of the strength considerably lower than in a direction parallel to fibers. [1] While low density, wood has high strength and it is also highly elastic. [3] Flammability of wood is probably one of the reasons why wooden houses are prevented from widespread.
Ďurica, Flammability of building materials - factor of fire safety of structures, Building materials. 4-5 (2010) 18-22

Since the medium transmissions are sold in the market for some time,the users often complained that the countershafts cracked easily.They do not reach the standard required.Once the automotive transmission occurs the countershaft’s fault which leads gearbox fractured and other parts damaged.The bus couldn’t run and operate.The company trade had suffered greatly during these accidents.The passengers complain bitterly that they had been unfairly treated.Usually,a transmission is made only by a static design,without the dynamic design.The traditional design method has affected the products’quality and reliability.The dynamic design might give a account of the vibration analysis[1,2].Because of large diameter of the intermediate shaft,the torsional vibration isn’t analysed during the shaft designed.The calculation method on the torsional vibration still needs to be further expand in China.On the torsional model,the shaft-system is usually divided into a multimass rotor system.This procedure
According to the mechanical properties of its material and selecting the safety factor,the design of the shaft meets the strength requirements and sufficient safety margin.
References [1] Zhong Yie.Rotor Dynamics[M].Beijing:Tsinghua University Press.1979 (in chinese) [2] Wen Bangchun,Gu Jialiu,Xia Songbo,Wang Zheng.Higher Rotor Dynamics[M].Beijing: Mechanical Manufacture Press,2000 (in chinese) [3] Gasch R.
(in chinese) [7] XIE Dan-mei,LIU Zhan-hui,YANG Chang-zhu,WU Yun-peng,LIU,Xian-fei.Sensivitity Analysis of the Torsional Vibration Behavior of Turboset’s Rotor System to Changes of Its Mechanical Parameters[J].Power Engineering.Vol.25 (2005),p.465-467.

The alloy surface was modified using a hydroxyapatite powder mixed EDM, and the effects of the process factors on the responses of the modified surface have been examined in light of the usability of 316L steel in the production of various biomedical devices [7].
When designing experiments with cryo-cooled (CC) electrodes, Taguchi's L18 orthogonal array has been used, taking into account input factors including current, duty cycle, fast capacitance level, and gap voltage.
Tables 1 and 2 respectively display the material's chemical composition and properties.
Electrode properties of the parent material Material Density [Kg/m3] Thermal conductivity [W/Mk] Melting point [⸰C] Specific heat capacity [J/g⸰C] Brass 8490 158 900 0.380 Experimental set-up.
Conclusion This work presents potential scientific innovation as methods to increase various non-traditional micromachining procedures and cryogenic treatments to improve the mechanical properties and material microstructure of advanced engineering materials continue to be an area of relevant research.

This study aimed to evaluate the impact of the sintering effect of ZCT ceramic oxides on several aspects, including crystal structure, surface morphology, optical properties, and electrical properties.
Because of its exceptional chemical, mechanical, and optical properties, zirconium oxides (ZrO2) have garnered much attention as a significant ceramic material.
This is because high-temperature sintering can alter the crystal structure and composition of the material, affecting its electrical characteristics.
Numerous factors, such as the preparation method and chemical composition, affect the dielectric properties. [40, 41] The equation in is used to get the dielectric constant (εꞌ) in a parallel plate capacitor.
"High-κ gate dielectrics: Current status and materials properties considerations."

., owing to its unique properties such as high oxidation resistance, corrosion resistance even at very high temperatures and retains a high mechanical strength under these conditions as well.
In machining Inconel718, the cutting speed vc is the main reason that affected the tool life.
All these factors resulted in the cutting property of tool declined.
Jiang: Chinese Mechanical Engineering .Vol. 20 (2009), p. 763 [4] A.

A key factor in the performance of Gas Metal Arc welding (GMAW) is the feedability of the filler wire.
Wire feeding issues can affect the performance of GMAW process as it determines the arc current and thus influences the heat input to the weld.
One important factor that controls wire feeding is friction between the welding wire and the wire liner.
Base metal composition and mechanicl properties C Mn Si Cu Ni Mo P S Al 0.1-0.2 1-1.7 0.6 0.3 0.3 0.08 0.03 0.03 0.02 Yield Strength=335 Mpa Ultimate Strength=510 MPa Welding Power Source For the analysis, EWM Q552 Alpha power source was used.
REFERENCES [1] Kobe Steel Ltd., Essential Factors in Gas Metal Arc Welding, 2011, pp. 5,6,10