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Fig.2 Time evolution of the bubble radius R(t) in liquids with different viscosity. 3.2 effect of surface tension on bubble dynamics Surface tension of a liquid is one of the basic factors determining the rate and nature of the collapse of cavitation bubbles.
First, the physical properties such as viscosity and surface tension of high temperature water are quite different from those of normal-temperature water.
The reason is that liquid viscosity, surface tension and saturated steam pressure and other physical properties caused by the change of the liquid temperature.
The results show that the temperature is the most important parameter which affects the expansion and collapse of a bubble.
China Mechanical Engineering, 2007,18(22):2687-2691 [3] Li Chao, Ying Chong Fu, Bai Li Xin et al.The characteristic of cavitation noise and the intensity measurement of hydrodynamic cavitation[J].

On the other hand, the uncertainty factors of the actual engineering problems should be considered when the grids are selected and calculation results are analyzed.
Their mechanical behavior can described with finite element method.
It should consider many factors including of material nature, calculated capacity and calculated accuracy etc.
The grid form and density affect computation time and outcome precision.
Therefore, the structure geometric properties, physical and mechanical properties and materials nature should be researched for the proper finite element model.

Influence regularities of axial force of cross wedge rolling symmetric shaft-parts about technical parameters Xuedao Shu 1, Baoshou Sun1 and Min Xiao1,a 1College of Mechanical Engineering and Mechanics, Ningbo University, China , 315211 axiaominsohu@163.com Key words: Technical parameters; Cross wedge rolling; Asymmetric; Axial force Abstract: Because of unbalanced axial force of cross wedge rolling asymmetric shaft-parts causing the rolling play and not stably, it is key factors to restrict application in asymmetric shaft-parts of cross wedge rolling.
It will impede the smooth progress of the rolling technical and affect mechanical properties of products in rolling technical.
In establishing the finite element analysis model, we can get the real forming technical by full considering above factors.
Mechanical Technology Division, vol.4 (2001),p.33

Usually there are many gases parameters affecting transformer faults, but it is impossible for us to build an equation system including all relevant parameters in the fault diagnosis model, and the high correlation between the various gases parameters will have adverse effects on the accuracy and rate of fault diagnosis.
Establishment of training set and test set.Taking the transformer type, capacity, operating environment and other relevant factors into Consideration, we choose transformers with voltage level equal or below 220KV as research subjects.
Normalization can prevent excessive weight when properties with a larger initial value compared to properties with smaller initial value.
GEP can reflect the relationship between training samples and the relevant factors, and adaptively identify factors associated with the load changes, then generate fault diagnosis model automatically.
MECHANICAL ENGINEERING & AUTOMATION, vol. 3, pp. 122-123, 2010

The cyclical effect of these factors in the casting process contributes to the growth of heat cracks on the forming surfaces, which directly affects the quality of the surfaces of the resulting castings [4].
At the same time, these coatings provide a slowdown in the growth of cracks, both in the mold material and in the coating, due to high strength properties and the level of residual compressive stresses, but the effectiveness of multi-element coatings is different and depends on their properties.
This feature allows you to expand the possibility of using coatings in terms of obtaining properties that meet various requirements.
Thus, if we take into account all the factors described above, it is possible to form a coating in which the lower layer will have increased strength properties that reduce the wear of the forming surface, both at high and low intake speeds.
Hekimoǧlu, Relationships between mechanical and tribological properties of Zn-15Al-based ternary and quaternary alloys, International Journal of Materials Research. 107(7) (2016) 646-652

After testing the corresponding mechanical properties, internal small, the super early strength grouting material block for 2.5-5.0{mm} may remove the specimen surface of cortex for microstructure analysis.
The experiments at three levels, three factors, by using L9 (33) orthogonal table are designed.
Factor levels table shown in table 1(B for the amount of cementitious material) Table 1 Factors and levels of orthogonal test design The levels Factors Sodium sulfate (%)(B) triethanolamine (%)(B) Early strength Component A (%)(B) 1 0.6 0.03 0.6 2 0.8 0.05 0.8 3 1.0 0.07 1.0 Experimental results and analysis The determination of the optimal ratio.
To various factors of the specimens, the strength index is that the maximum is optimal.
As a result of the early strength agent cost and price factors, super early strength grouting material costs and prices are badly affected.

Dynaform software is used to simulate its forming process to acquire the feasible process parameters affecting its formability.
The formability of stamping products is generally determined by the factors including the structure of die, the material properties, the shape of initial blank, the blank-holder force, the layout of draw-bead, lubrication condition and so on [2].
Therefore, finding out the influential factors and determining their optimum selection are very important during designing a feasible and sound mould.
They will also affect the size precision and the surface quality of the final product.
So, considering all the factors, the optimum scheme should be A2B2C3.

The biosphere, hydrosphere, lithosphere and rock and geological microbial loop and other environment and their interaction problems", mainly is the study of cycles in a different environment (cycle) under the action of the engineering properties of soil and water system.
Effects of human activity to the earth's surface is a subsystem of the system of the universe and its factors are interdependence and mutual restriction between, any part of the changes will affect other parts of the system, but also affected by other parts
Rock and soil mechanics, belongs to the edge of the mechanical discipline, more be model and modeling study of mechanics.
It directly affects the development of the national economy and the people's life.
Once to prevent improper, it will have dire consequences, even endanger people's lives and property safety.

Introduction Through about 40 years' research, the fiber reinforced plastics (FRPs) are found attractive in the energy absorption field owing to their superior inherent properties for example the strength to weight ratio compared with metal [1-2].
Therefore, the mechanical property in the axial direction was high in the tubes with a small braiding angle.
The constrained central cracks propagation and high axial mechanical property of the 3D braided composite tube with a braiding angle of 18 were considered as the important reasons which led to the increased specific energy absorption in both geometries tubes.
Obviously, the corner geometry affects the energy absorption capability significantly.
It can be inferred that the corner parts are the most important factors which affect the collapse performance of the whole tube and the energy management capacity in the end.

This paper is concerned the breaking elongation properties of Carbon/Aramid-, Carbon/Glass- and Aramid/Glass- matrix hybridized commingling yarns.
Since breaking elongation is one of most important properties in textile fiber, it was examined closely with reference to the first breaking point of commingling-hybrid yarns.
GF/AF/matrix is shown very much better elongation properties.
This is closely related to the behavior of tensile properties such as elongation and yarns modulus.
To obtain a good elongation properties, PP matrix is most suitable among other selected matrix materials as given in Fig.2, because, PP and PES can bear more tensile forces than PEEK matrices filaments.