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Complex systems with complex, open, self-organization, nonlinear, level and other properties, should be researched by comprehensive and integrated methods [3-7].
According to the brittle characteristics of complex systems, water conservancy and hydropower engineering construction accident could be seen as the results of collapse with the accumulation of system brittleness, various risk factors leading to accidents could be considered as factors affecting brittleness.
In order to further examine the effect of the factors affecting the system brittleness and make system sensitivity analysis of influencing factors, responsibility consciousness E11, the field inspection condition E21 and the number of mechanical equipment E31 are taken as an example for analysis.
Conclusions The traditional system fragility evaluation method is usually based on the assumption that the affecting factors are independent and the fragility degree can be calculated by linear addition.
However, in complex systems this assumption may be invalid because of the interaction of the subsystem, mutual influence of the affecting factors and the nonlinear features of the subjective factors.

The article describes the quality refractory materials, the main requirements for quality of lining bricks and chemical and physical wear factors, which influence the quality of refractory materials.
Basic external factors that affect the wear of refractory material can be classified into three basic groups: thermal effects (degree of overheating, thermal shock, thermal fatigue,); mechanical effects (erosion, abrasion, socks, vibrations, mechanical fatigue,); chemical effects (hydration, corrosion, smelting, slag infiltration, desulphurisation, impact of alkali and furnace atmospheres,).
Chemical and physical wear factors During use, refractory materials are exposed to chemical and physical action of the environment [4].
The physical properties of the melt affect the process of corrosion of refractory materials in particular the viscosity, density and surface tension [5].
Some properties of CaCl2 are shown in table 3.

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.

Due to their mechanical properties similar to those of polypropylene or polyethylene, PHAs are considered as an alternative to synthetic polymers.
Our results indicate that accumulation of PHB granules in bacterial cells affects overall physico-mechanical properties of the cells in particular their sedimentation potential and density.
Generally, the explanation can be that chemical mutagenesis employed to gain PHB non-producing strain might have affected other cellular structures, thereby affecting the density and sedimentation properties of the mutants as suggested by Eroglu and Melis [10].
In addition, the fact that presence of PHB granules in cytoplasm of bacterial cells enhances density of cells might dramatically affect physico-chemical properties of the cells.
Based on our results we can hypothesize that presence of PHB granules in cytoplasm significantly affects physico-chemical and mechanical properties of bacterial cells and cytoplams which might provide important advantage during exposition to various stress conditions.

Sintering is a key step in the metal injection moulding (MIM) process, which affects the mechanical properties of the sintered part.
The mechanical property of the sintered compact is resulted from tremendous sintered part densification.
The process combines the design freedom of plastic injection moulding with material properties near that of wrought metals.
Table 1 Factor level (variables) in the experiment Factor Level 0 1 2 A Sintering Temperature (°C) 1340 1360 1380 B Dwell time (minute) 60 120 240 C Heating rate (°C/min) 6 8 10 D Cooling rate (°C/min) 6 8 10 Design of experiment (DOE) There are many sintering parameters that have some effect on the properties of the sintered part.
The most influential factor for the best flexure strength, a cooling rate, was found to have a linear reduction of flexure strength when the cooling rate is increases to the higher factor level.

Dynamic Response Analysis of Motorcycle Fenders Liu Jun1 Li Liang2 Yancheng Institute of Technology Yancheng 224003, China; liuj@ycit.cn jzlliang@163.com Key Words: Fender；finite element method；modal；Dynamic response Abstract：Motorcycle fender is one of the main components of motorcycle，fender structure directly affected it's comfort and security properties．In this paper, the finite element modeling and dynamic response were analyzed using NX 8.0, and found its natural frequencies and mode shapes.
On the basis of the fender structure modeling on different road with the same speed, this paper investigated the several factors affect the vibration motorcycle and analyzed true fender of the motorcycle and did comparative analysis with the modal analysis results.
We build fender finite element model according to the following principles: (1) The analysis of the finite element model fender should gain on the real structure of simultaneous approximation fender form both the mechanical and geometrical properties, especially from the dynamics of the interpolation approximation
The main conclusions were as follows: (1) we established the finite element model fender and analyzed it's modal; (2) we analyzed it's frequency response analysis in random road situation . we obtained result that the properties of materials mentioned in this article meet analyzes results, and it can be used to produce the fender, our calculation results were similar to the actual theory.
Journal of the Chinese society of mechanical engineers 2008,21(3):265～282 [2] LiuGang，Studyon deformation of titaniumthin- walled part in milling process Journal of Materials Processing Technology Volume 209， Issue 6，19 March 2009：2788~2793 [3] Luo YH, Li LX (2006) Study on isothermal extrusion using the deform.

This paper investigates the effects of normal hot rolling and high rate cooling (NHR+HRC) on microstructure and mechanical properties of the rolled EH 36 hull plate.
Table 2 Properties of the tested steel No.
Therefore, control of the rolling process is still one of the key factors that affect the mechanical properties of the high-strength hull plate
The mechanical properties meet the standard of EH36 hull plate with the exception of impact toughness.
Table 4 Properties of the industrial trial steel Thickness [mm] Final cooling temperature[°C] Cooling rate[°C/s] Mechanical properties Impact toughness of -40 °C[J] Rm[MPa] Rp0.2[MP] A[%] 48 600 15.8 815 680 15.5 111 17 22 Conclusion Quenching test was utilized to explore the appropriate heating temperature for NHR+HRC.

Further, the studies clearly show that mechanical properties of stir cast composite depend upon factors like fabrication techniques, volume fraction, shape and size of reinforcement particles and the distribution and properties of constituents.
The mechanical properties of these materials affect the mechanical strength and ability of material to be molded in suitable shape.
Properties of Al-2024 Alloy Mechanical Properties Metric Values Mechanical Properties Metric values Density 2.78 g/cc Fracture Toughness 26 MPa-m1/2 Hardness.
Properties of Al5083-O Alloy Mechanical Properties Metric Values Mechanical Properties Metric values Density 2.66 g/cc Fracture Toughness 150 MPa Hardness.
These measures of strength are used, with appropriate caution (in the form of safety factors), in engineering design.

Abstract: Graphene is a wonder material, and it has remarkable mechanical property not only limited to few kind of mechanical properties.
This factors governing the composite, causing porosity and premature, unpredictable defects.
Orowan looping, shear slack, separation dislocating thickness instrument had been utilized to assess the greatest reinforcing commitment factors perspective.
Effect of mechanical properties due to reinforcement of graphene Based on our study about the test results of the Al-Gr composite, it was found that the mechanical properties has affected due to the reinforcement of graphene.
Experimental analysis of mechanical properties of stir casted aluminium-graphene nanocomposites.

In order to avoid the subjectivity during determining atomic hybridization state, Liu Zhilin and Lin Cheng advanced a new method for the calculation of alloy phases electronic structure parameters, i.e. calculation of statistical value of parameters based on the thought “macroscopic physical quantity should be the statistical value of microstate” in 2007[8], which was applied successfully to theoretical calculation of alloy phase transformation, strengthening mechanism and mechanical properties[9,10].
Phase structure formation factor which is essentially a measure of tendency of constitutional undercooling [8, 11, 12].
Electronic theory analysis of graphitization behavior of alloying elements New segregation structure units with different S′ including γ-Fe-C-M and (Fe,M)3C et. al. appear with the alloying elements addition, which affect the crystallization order of each phase.
Liu, et al.: Interface Electron Structure and Interface Property (Sci.
Lin: The Calculation of Statistical Values of Electron Structure Parameters and Mechanical Property in Alloys (Meta.