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Weight factors represent the important degree of an indicator in the indicators system, in the case of other indicators remain unchanged, the changed indicator affects the results.
Weight factors divided into two types, un-weighted weight factor and weighted weight factor.
Empirical method is that the experienced experts and scholars analyze which of the indicators are important, which of the indicators are not important with their experience in practice, to determine the weight factors of these indicators.
Journal of Mechanical Engineering. 2009, 45(12): P151-161.In Chinese
Journal of Mechanical Engineering. 2007, 43(2):P202-209.In Chinese

At the beginning of the 21st century, the scientists from all over the world began to conduct a preliminary study on Magnetic compound fluid grinding technology. [3]In this paper, the physical properties and grinding mechanism of MCF are analyzed to find out its material removal parameters in section 1.
Other detailed information and the proportion of the ingredients is listed in Table 1. [6]- [8] Table 1The process parameters table These tests are used to analyze how some factors affect the grinding quality.These factors are magnetic field strength–H, magnetic eccentricity-e, Spindle speed-R, grinding time-T and machining gap-h.
In the case of multi-levels and multi-factors, five factors and four levels orthogonal experiment method is adopted. 3.1 The effects of spindle speed Fig. 3 shows the relationship between spindle speed and processing effect.
Machining gap affects the grinding pressure directly.
Experimental study of various influence factors of the magnetic compound fluid (MCF) flow characteristics [J].

Marine Engineering Steels—Properties Requirements and Evaluation Jian-Xun FUa,*, Le CHENb, Chang-Jin WUc and Yan-Xin WUd,* Key Laboratory of Modern Metallurgy & Materials Processing, Shanghai University, Shanghai, China afujianxun@shu.edu.cn, b1551863449@qq.com, cwince@shu.edu.cn, dhinginu@126.com *Corresponding author Keywords: marine engineering steel, corrosion resistance, structural toughness, weldability.
Due to the welded structures of offshore platforms, platform steel requires good processing properties and mechanical properties, particularly demanding in terms of toughness.
These types of corrosion are often related with the structural design or metallurgical factors.
In additional, the CTOD test is also indispensable to measure the fracture toughness of the welded joints and evaluate the crack resistance of the weld joint properties.
Low toughness would affect the safety and service life of the structure while high toughness would significantly increase the cost of production.

Higher solar absorptance and lower thermal emittance are the key factors for solar collectors.
Factor A (DC Power) Factor B (RF Power) Factor C (Argon Gas Flow Rate) 1 1 1 1 2 1 2 2 3 1 3 3 4 2 1 2 5 2 2 3 6 2 3 1 7 3 1 3 8 3 2 1 9 3 3 2 Based on the process parameters identified for sputtering of metal and dielectric thin films, the experimental plan is prepared so that sputtering process carried out at different conditions to observe effects of these conditions on thin film properties.
Experimental results shown in Table 3 is analyzed to optimize the thin film deposition factors.
Prieto “Mechanical properties of sputtered silicon nitride thin films” Journal of Applied Physics, 2003; 94 (12), 7868-7873
Muralidhar Singh M, Vijay G, Krupashankara M S and R S Kulkarni “Effect of Argon Gas Flow Rate on the Optical and Mechanical Properties of Sputtered Tungsten Thin Film Coatings” Materials Science and Engineering, 2016;149, doi: 10.1088/1757-899X/149/1/012075

Introduction Ti-rich TiAl intermetallic compounds have been developed as a lightweight and heat-resistance structural material due to such superior properties as high strength, decent ductility and oxidation resistance [1].
Introducing pores into Ti-rich TiAl is one way to further develop this alloy by reduction in weight and improvement of mechanical properties.
Among them, the formation of aligned pores gives anisotropy in the mechanical and physical properties of materials.
Porous intermetallic compounds often contain dendrite and grain boundaries produced during and after solidification, but their microstructures related to mechanical properties are rarely controlled during the solidification process.
Thus, we are now considering that not only the formation of directional pores but also the microstructure should be controlled to improve the mechanical properties.

Introduction SiCp/Al composites are characterized by its excellent physical and mechanical properties such as high strength, high stiffness, wear resistance, antifatigue, high fracture toughness, good heat stability and low coefficient of linear expansion, so these materials have found extensive applications in aviation, aerospace and other industries [1].
However, the cutting processing is very complicated, and factors that affect the tool wearing are not limited to the impact of SiC particles but include built-up edge and the diffusion and oxidation of chemical elements at high temperature, etc.
The material properties are shown in Table 2.
The factors and level parameters are shown in Table 3.
Muthukrishnan, in: ASME International Mechanical Engineering Congress & Exposition, American Society of Mechanical Engineers publishers(2009) [7] Wenfeng Zhang, Xiaonan Pan: Journal of Materials Engineering. (1999), p. 14(In Chinese) [8] N. muthukrishnan, J.P.

Along with the plant-based fibers, thermoplastic starch can be used to enhance the mechanical properties of composite materials.
Fabrication and mechanical properties should be combined while promoting these natural fibers for any commercial applications.
Fibre area correction factors (FACF) for the extended rules-of-mixtures for natural fibre reinforced composites.
Experimental Investigation of the Physical and Mechanical Properties of Sisal Fiber-Reinforced Concrete.
Physical, thermal, morphological, and tensile properties of cornstarch-based films as affected by different plasticizers.

(2) insolution properties: heat transfer resistance R0=1.764（m2·K/W） coefficient of heat transfer K=0.567(W/m2·k)
(4) frost resisting property : freeze-thaw cycle 30 qualified (mass loss: 1.9%; strength loss 9.1%)
Effects of Material Factors on the Performance of Energy-saving Composite Board Surface modification of waste EPS foam particles In this test high polymers latex, cellulose ethers, coupling agent and cement are mixed, it can be formulated into a polymers cement so as to modify the surface of wasted polystyrene foam EPS particle from hydrophobicity to hydrophilicity, it overcomes the cement and EPS not humectated, mixture workability poor, and the low bond strength through the method mentioned above .
Cellulose ether has effect on the thickening effect of EPS lightweight concrete obviously, and also improves the fresh EPS lightweight concrete’s water retention significantly by reduce concrete’s water absorption, It has plasticization effect on lightweight EPS concrete, therefore, it could maintain the original fluidity fluidity at low water-cement level, then the mechanical properties can be improved and enhanced[1,2].
Mechanical properties and durability of polypropylene fiber reinforced high-volume fly ash concrete for shotcrete applications.

The variation of this phase affected macro hardness of the investigated alloy.
NAB alloys have been widely used in various marine parts, sincethey exhibits excellent resistance to general corrosion, cavitation corrosion and erosion cavitation, ease of castingand distinguished mechanical properties[1,2].
Microstructure that provides a great combination of corrosion resistance and mechanical properties such as strength and toughness is requested.
Thermo-mechanical process is a favored manufacturing technique for producing alloy component with improved properties.
To obtain a specific microstructure of the NAB alloy from the process, better understandingof all relevant influencing factors is necessary.

Introduction The combined aggregate concrete is a kind of transitional concrete, the properties of which are between light aggregate concrete and common concrete.
According to the test results, the experimental phenomena of the combined aggregate concrete beams are similar with the ordinary concrete beam, and the factors affecting the strength of diagonal section is same.
References [1] Muyu Liu, Huaquan Yin, Qingjun Ding, Shuguang Hu: Journal of Wuhan University of Technology, Vol. 28 (2006) ,No.12, p.85-87 [2] Leishun Zhang, Xiaolei Zhang, Guoxin Yan:Industrial construction, Vol. 37 (2007),No9,p 57-60 [3] Fazhou Wang, Dinghua Zou, Shuguang Hu, Hongwei Han, Hua Xu: Journal of Henan Polytechnic University, Vol 24 (2005),No.2,p.136-139 [4] The Technical Specification for Light-weight Aggregate Concrete(JGJ 51-2002), China, Architecture and Building Press(2002) [5] Code for design of concrete structures(GB 5010-2010), China, Architecture and Building Press(2010) [6] The Standard for Test Method of Mechanical properties on ordinary concrete(GB 50081-2002),China, Architecture and Building Press(2002).