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Intorduction An experimental fact is that a narrow material layer is formed in the vicinity of frictional interfaces in metal forming processes whose properties are quite different from the properties in the bulk [1-3].
The material properties of the products extruded out from billets in the container and the channel part of the die are probably not the same, thus the billets are composed of two parts: billet 1 and billet 2, as shown in Fig.1.
Chandrasekar, T.N.Farris, A new approach for studying mechanical properties of thin surface layers affected by manufacturing processes, Trans.
Shikimaka, An approach to prediction of evolution of material properties in the vicinity of frictional interfaces in metal forming, Key Engng Mater. 345-346 (2007) 741-744
Sun, Optimum design, microstructure and mechanical properties of Ti/Ti3Al multi-layered materials, Mater.

Bacterial cellulose is a new pattern material produced by microorganism, because it has unique physical properties, chemical characteristics and mechanical properities, so it’s widely applied into food, biomedical, textile and many other kinds of industry.
Xiaobin Yu [19] used UV mutagenesis to obtain a new strain called UV3, it acid production obviously reduced and the cellulose it produced has high yield, at the same time the properties of the cellulose were very stable, the yield were increased for about 40% than the original strains.
Hwang[30] made some research on the affecting of the bacterial cellulose production by the dissolved oxygen.
Application of bacterial cellulose in acoustic equipment.Because bacterial cellulose has unique physical property and high mechanical strength can satisfy different unique need of material to make different acoustic equipment.
Analysis of the Structure and Properties of Bacterial Cellulose Produced in Different Cultivation Mode .

Thus, it offers better sound absorption properties comparable with glass wool.
There are many factors that influence the sound absorption coefficient of natural composite materials.
In this paper, banana fibers were thoroughly investigated by simulations to predict the sound absorption properties and factors influence the sound absorption coefficients.
Flow resistivity is the major factors for sound absorption for a wide range of porous materials.
The banana fiber properties (Sfiligoj Smole et al. [23]; Kukarni et al. [24]).

These findings lay a firm platform for the application of computational models for the study of the biomechanical properties of the upper airway in the pathogenesis and treatment of OSA.
Flow Properties and Boundary Conditions.
[3] Redline, S., et al., Risk factors for sleep-disordered breathing in children.
[5] Young T, S.J.P.P.E., RIsk factors for obstructive sleep apnea in adults.
[16] Cheng, S., et al., Viscoelastic properties of the tongue and soft palate using MR elastography.

Crosslink density is very crucial for good elastic properties of natural rubber product.
The degree of crosslink of raw natural rubber can be influenced by lots of factors.
Double network structure can be easily affected by the procedure of processing, especially the wet natural rubber drying.
When the wet natural rubber was dried under an appropriate drying time and drying temperature, drying rate and so on, the dry rubber was showed a relative excellent comprehensive properties, for example, good strength, ageing resistance, wear resistance, and so on.
However, the actual network structures were far from the ideal state and their mechanical properties were difficult to explain only by the crosslink density and entanglements.

Under the same excitation conditions, waveform characteristics including the visual cycle, the number of phases, envelope shape, amplitude ratio between the extreme values of the same reflecting interface are relatively stable due to small differences of the propagation path and dielectric properties.
Based on these parameters and th eir relative changes we can determine rock weathering and physical properties, as well as rock structural state, stress, flexibility and rock physical and mechanical properties.
Physical and mechanical statistics for rock and soil are shown in Table 1: Table 1 Physical and mechanical statistics for rock and soil Serial No.
The Correction Factor K1 for Groundwater Impact.
Use correction factor 0.15 and the total correction coefficient for surface occurrences affect K2 = 0.15.

The performance of the Nd:YAG laser to cut thick (500 µm) free standing CVD diamond films for electronic, optical and mechanical applications, is investigated.
Introduction It is well known that diamond is very attractive for a wide range of applications because of its extreme properties.
The mentioned properties together with the developed chemical vapour deposition CVD technique to grow diamond have increased the application of diamond to many diverse technological areas, such as abrasive and cutting tools, heat sinks, high power and high speed electronic devices, optical windows, etc. [3].
Results and Discussion The interaction between the laser beam and the diamond work piece depends mainly on two set of factors: i) the laser beam characteristics, such as wavelength, pulse energy, pulse width, focal position, and frequency; ii) the work piece characteristics, such as absorptivity at the incident radiation, thermal diffusivity or the presence of impurities [6].
As the heat-affected zone is restricted, the diamond structure at the cutting surface is relatively preserved.

The results revealed that porosity was affected by both solids loading and sintering periods.
While pore sizes were not significantly affected by the two factors, the increase in solid loadings and sintering period could result in a narrower pore size distribution.
Jongprateep, Ba0.9 A0.1TiO3 (A= Al and Mg) Powders Synthesized by Solid State Reaction Technique and Their Dielectric Properties, Advanced Materials Research. 747 (2013) 603-606
Herliansyah, Effect of sintering temperature on mechanical and tribological properties of hydroxyapatite measured by nanoindentation and nanoscratch experiments, Ceramics International. 40(7) (2014) 9159-9164

They affect the formation of the microstructure through both, the local changes of transformation temperatures and the shift of the excess carbon by cooling from the transformation front into the untransformed austenitic regions.
In fact, it is well known, that the primary segregation of alloying elements affects the temperatures of γ-α-transformation Ar3, Ar1 and Ac3, Ac1.
Khan: Role of ferrite/pearlite banded structure and segregation on mechanical properties of microalloyed hot rolled steel.
Hunkel: Analyse von Seigerungen und seigerungsbedingtem Verzug am Beispiel des Einsatzstahls 20MnCr5, HTM 67 (2012) 5, pp. 311/21 [5] Wang Bin, Hu Hong-Mei, Zhou Cui: The Method of Eliminating Banded Structure and the Effects of Banded structure on the Transverse Properties in 20G Steel, Applied Mechanics and Materials, 347-350 (2013) pp. 1171/1175 [6] S.
Howell: Factors influencing ferrite/pearlite banding and origin of large pearlite nodules in a hypoeutectoid plate steel.

Introduction Plastic deformation is the basic process of changing the geometrical features of solid bodies affected by external or internal forces, on which the technology of plastic working is based.
Due to the rather high interest in non-homogeneous deformation, the considerable amount of investigations has been started, dealing with the influence of those factors which are responsible for this phenomenon.
Micropores occurring in a single crystal of the alloy CuZn30 with the crystallographic orientation []: a) size distribution of micropores, b) SEM image of the pore with the results of chemical composition microanalysis at the internal surface of a micropore The microstructure of plastically deformed single crystals with the orientation [] was essentially affected by the temperature and strain rate.
Wang, The effect of cumulative large plastic strain on the structure and properties of a Cu-Zn alloy, Mat.
Grzegorczyk, The influence of the temperature of plastic deformation on the structure and mechanical properties of copper alloys CuCo2Be and CuCo1Ni1Be, Arch.