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Through analyzing the components of each subsystem, the potential safety factors set of high-speed railway accident U={R, S, H} is established, where R is potential safety factors of personals subsystem, S is the potential safety factors of equipment subsystem, H is the potential safety factors of environment subsystem Personnel subsystem.
Due to the intrinsic properties and potential destructive power, the equipments in high-speed railway system need more reliability and safety.
In the high-speed railway system, environment factors increase the risk by affecting the system inside.
For example, = {higher speed}, = {no-load}, = {the large curve radius}, these three factors affect alone has small probability of accident, but the combined effect of three factors together increase the probability of the accident, and will result in the emergence of an accident (as shown in Figure 2).
Figure3 High-speed railway derailment accident chain 4 Case analysis The train derailment will destroy people' lives and property.

In this study, the effects of oil palm shell powder (OPSP) addition on the mechanical properties of kenaf reinforced polypropylene (PP) composites are investigated.
Natural fiber reinforced thermoplastic composites have been widely studied in an attempt to obtain benefit from the cost and mechanical properties of these natural fibers.
Olumuyiwa et al. [10] studied the effect of OPS particle sizes (150, 300 and 400 μm) on the mechanical properties of recycled polyethylene composite.
A good filler distribution also could be one of the factors that contribute to the increase in tensile strength.
Conclusion The effects of OPSP addition on the mechanical properties of two types of kenaf/PP composites are compared.

Abstract: Different Power types and parameters in the electrodeposition process result in different microstructures and hence mechanical properties.
The tensile properties of Ed Cu after Surface Mechanical Attrition Treatment (SMAT) are also shown in this paper.
It is clear that the processing history has a significant effect on the mechanical properties of nanostructured materials.
Since the properties of the materials obtained from electrodeposition and SMAT are strongly affected by the parameters of both processes, room for improvement could be expected.
Mechanical Properties There is various literature which has reported on the experimental results on the tensile strength of Cu.

Tribological properties of CVD diamond films against zirconia ceramic WANG Haiwang1,a, LEI Xuelin 1,b, WANG Liang 1,c, SHEN Bin 1,d and SUN Fanghong 1,e 1School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China allcwhw@126.com, bsuperlxl@sjtu.edu.cn, cliangwang@sjtu.edu.cn, dbinshen@sjtu.edu.cn, esunfanghong@sjtu.edu.cn Keywords: HFCVD; Diamond film; Zirconia ceramic; Tribological behavior Abstract.
The tribological properties of diamond films against zirconia ceramic are conducted on a ball-on-plate type rotating reciprocating tribometer in ambient air.
In order to find the feasibility of it, the tribological properties of CVD diamond film against zirconia ceramic must be understood in advance.
As with most materials, the frictional behaviors of CVD diamond films are affected by many factors, which are divided into two kind types, namely intrinsic factors and extrinsic factors.
Extrinsically, there are many chemical, physical and mechanical factors existing in the surrounding environment [9].

Taguchi method is used to design and accordingly L27 orthogonal array with five factors viz particle size, weight percentage, cutting speed, feed and depth of cut each at three levels is employed.
While machining AlMg alloy feed rate was the major significant factor for surface roughness and other factors viz cutting speed and depth of cut slightly affect the surface roughness [9].
Uniform distribution of reinforcement material should be ensured because homogeneous reinforcement distribution gives better properties.
Analysis of Variance is performed to investigate the significance of process parameter affecting the response.
From the ANOVA table, it is incurred that all factors significantly affect the response of surface roughness.

Used as a high temperature structural ceramics sintering aids, to note that the impact of the grain boundary glass phase is a major factor in high temperature mechanical properties.
Main Properties of SiC The Structure of Silicon Carbide.
Fig.1 Diagrammatic Sketch of Common SiC Atoms Fault Chemical Properties of SiC.
Thermal Properties of SiC.
Toughness SiC particles, usually with - given amount of SiC particles in the shape of a mold size, the predetermined pressure is applied after the particles are not crushed to reflect the percentage, it is affected by many factors such as particle shape .

Simulation and analysis of the model of calculating contact tangential stiffness between cylinders’ joint interfaces by MATLAB Chen Qi , Huang Kang, Zhao Han, Zhang Yan School of mechanical and automotive engineering, Hefei University of Technology, Hefei 230009, China hfut.chen@yahoo.com.cn Keywords: Cylinder; Tangential contact stiffness; MATLAB; Abstract: Contact tangential stiffness is an important parameter affecting the dynamics performance of contact bodies.
Simulation results by the software MATLAB show that: this model can correctly reflect the conclusion influenced by the parameters of fractal dimension, roughness amplitude and material properties parameters, so the model is improved true in theory.
INTRODUCTION Contact tangential stiffness is an important parameter affecting the dynamics performance of contact bodies.
Then simulation about the model is given to find out the influence factors of contact tangential stiffness.
[J] China Mechanical Engineering.2000.11(7):727 -729.

The factors affecting extraction effect，including extraction solution, extraction time, kinds and dosages of sediment, and the pH conditions were improved, and optimization of separation method of 7S and 11S in soy protein with orthogonal test.
The functional properties of the product are not outstanding, which limits the application of soy protein in the food[5].
Determination of optimal extraction condition On the basis of single-factor experiment, this paper carried out L9(33) orthogonal experiment on the key influencing factors of separation and extraction.
The levels of factors are shown as Table 1, thus the optimal extraction conditions of the components of 11S and 7S can be determined.
According to the range, it can be known that the main sequence of the influencing factors of 11 S globulin extraction rate was A > C >B, namely leaching time > acid precipitation pH > precipitant concentration.

The optical and mechanical variation properties caused by degradation are originally due to the existence of defects (superficial cracking, scaling, craters, corrosion …etc.).
Indeed, the erosion is affected by many factors such as characterizes of the impact particles (e.g. size, shape, density, hardness and fracture toughness), the properties of target materials (e.g. hardness, fracture toughness and surface roughness) and the test conditions (e.g. particle speed, impact angle and ambient temperature).
Among all these properties, the hardness HV and the fracture toughness KC are the two main properties influencing the erosion [12, 13].
There are many erosion parameters that affect their properties (velocity of air flow, grain sizes, impact angle, and so on…).
The aim of this study is to define the important characteristics as the crack depth and the roughness surface and thus their influence on optical and mechanical properties.

The results show that the global stiffness of the reinforced slope is obviously affected by the diameter of the pile and the liquefaction in substratum, which thereby affects the seismic acceleration response and the distribution of spectral amplification factor.
In order to meet the more perfect conditions of similarity on the model pile, the reinforced concrete model piles were developed and made up of model concrete and galvanized wire which had similar mechanical properties as steel, and this kind of model pile can reflect the failure mechanisms of the prototype reinforced concrete pile [3].
The properties of model 3 were the same as that of model 2 except that model 3 was under the condition of a high water table (Fig.2).
As is shown in Fig.8, the maximal amplification factors in the substratum section and near the slope crest are 1.79 and 3.40 in model 1, respectively.
Thus the maximal amplification factors at the slope crest only augment a little.