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Research proves that peroxidase can be used to modify the PA66 and PA6 surface properties ,in the modified process, the strength and the diameter of the fiber will not reduce[14].
The grafted polymer technology is based on the enzyme catalysis , use free radicals grafted polymer ,which produced in the process of enzyme catalysis, to graft polymerization with allyl base glycidyl ether as monomer and Kevlar fiber, the graft copolymerization reaction can be divided into three procession about "initiate process", "grafted polymerization" and "reactions terminated", thus there are many factors affecting the reaction, such as grafted monomer concentration, enzyme concentration, the oxidant amount, pH value, reaction time, reaction temperature, reaction medium ,all of them influence the grafted rate of fiber.
Therefore, we think that the fiber surface properties changed, eventually the adhesion between the fiber and resin matrix enhanced.
At the same time ,the high Yc shows that grafted AGE can be potentially used to improve the fiber properties of flame retardant.
[10] Fallania F,Ruggeria G,Broncoc S,Bertoldoc M,Modification of Surface and Mechanical Properties of Polyethylene by Photo-initiated Reactions,Polymer Degradation and Stability,2003,82:257~261

The GTAW welding parameters are the most important factors affecting the quality, productivity and cost of welding joint [1].
The weld pool quality play an important role in determines the mechanical strength of the weld pool geometry.
The chemical compositions and mechanical properties of base metal are presented in Tables 1 and 2.
Travel car TIG Torch TIG Holder TIG Wire feeder Machine TIG Machine Arm Support Wire feeder nozzle Fig. 1 Schematic Diagram of Semi GTAW process Table 2 Mechanical properties of base metal Yield Strength Tensile Strength Elongation(In 50mm) Hardness Rockwell 370 MPa 440 MPa 15% B71 (a) Single bead geometry (b) Padding bead geometry Fig. 2 Single and padding weld bead geometry diagram The Taguchi method of welding parameter optimization The Taguchi method uses a special design of orthogonal arrays to investigate the entire process parameter space with a small number of experiments.
Results of analysis of variance ANOVA (Table 6) indicate that flow rate, welding current and welding speed are the significant welding parameters affecting the multiple quality characteristics.

The study of mechanics model technology is very important for cutting mechanics analyse, while there are lots of factors affecting cutting force.
All factors are uncertainty, so it is very difficult to build a comparable consummate mechanics model.
Cutting force empirical model and experiment result Cutting parameters (cutting speed, feed rate and depth of cut) are the main factors which affect cutting force.
Table 1 Physical and mechanical property of workpiece's material GCr15 material properties density （g/cm 3） rigidity （HV） young modulus （Gpa） Poisson ratio transmit heat coefficient (W/m·K) Heat expand coefficient (×10-6/℃) value 7.85 55 217 0.3 39 14.4 Fig. 1 Experiment of high speed cutting Table 2 Tool geometry parameter in experiment orthogonal rake circumferential clearance inclination angle cutting edge angle tool arc chamfering chamfer angle o o /( )γ oo /( )α os /( )λ or /( )κ r / mmε tb / mmγ ob t /( )γγ 0 7 0 95 0.4 0.25 -25 Cutting model is exponential equation generally.
Table 3 Choose of cutting parameters and its level experiment factors values -1 0 1 v(m/min) 200 250 400 f( /mm rev ) 0.05 0.08 0.15 ap( mm ) 0.05 0.08 0.15 Table 4 Experimental and predictive values of cutting force No.

The results showed that the priority order of the factors was reaction time > acid mass fraction > reaction temperature > solid-liquid ratio.
In order to optimizing the separation process of polyester-cotton blended fibers, we selected four factors such as acid mass fraction, reaction time, reaction temperature and solid - liquid ratio and each of the factors was endowed with three levels.
To discuss the concrete influence of process parameters on the separation effect and further optimize the reaction process, the single-factor experiment analysis was taken on the significant factors.
(a): before reaction, (b):reaction for 30-min, (c) :reaction for 60-min, (d):reaction for 80-min, (e):after reaction Conclusions (1) The order of the factors affect the separation was: reaction time> acid mass fraction > temperature> solid - liquid ratio.
After separation, polyester can be thermal depredated or re-span if the mechanical properties of strength and other physical conditions allowed.

THE GENERAL PROPERTIES OF HDPE ARE GIVEN IN TABLE 1 [2].
The new generation of polymers could be a choice for light structures and due to improvements of its mechanical properties especially in hard polymers; they can provide sufficient strength to be use in structures.
The safety factor was predicted to be 1.143.
D790-10, Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials (pp. 11): American Society of Testing Materials
Properties of Materials (Polyethylene & Polypropylene).

However, because the properties of composites depend on process crafts badly, unreasonable processing technology will lead forming difficult, and then redesign is needed.
This affects production efficiency badly in PCB enterprise.
The rapid infiltration production technology not only improves the performance of composite materials, but also has important significance to improve the interfacial properties of the composites.
The interfacial state which generally characterized by materials’ infiltration property between them is an important factor that affected the performance of composite materials.
The existence of these defects not only affected the quality and the appearance of the products but also critically decreased the reliability, electric property, water resisting property, weather fastness, mechanical property and other performances of the material.

Politsinsky et. al, Quantum-chemical study of the structure and properties of lead chalcogenides, Fundamental research. 9 (2014) 556-561
Ettmayer, Critical review on the elastic properties of transition metal carbides, nitrides and carbonitrides / // J.
Sirotkin, Multilevel structure and properties of metals and polymers within the unified model of chemical bond, J of Mat.
Malenko, Regression dependencies for evaluating the mechanical properties of steels during solid-solution hardening, Metals. 4 (2015) 64-71
Malenko, Method for evaluating the effect of solid-solution hardening on the mechanical properties of steel in the finished product, Problems of ferrous metallurgy and materials science. 2 (2015). 44-48

The residual Mn and Fe as impurities may have a bad influence on mechanical properties of Cu-30Ni alloy.
Therefore, over-added Mn and Fe incline to deteriorate the microstructure and mechanical properties.
Therefore, the use of unclean raw material and contaminated processing environment with iron chips can bring negative effect on mechanical properties.
There are a number of factors that affect the overall performance.
Among these are the volume percentage, shape, location, mechanical properties and the compositions of inclusions.

With respect to the assembly of carbon nanotube field effect transistor, the dielectrophoresis technology is adopted, which assembles SWCNTs between the micro-electrodes, SWCNTs are affected by the electrophoretic force which is carried out by the related theoretical analysis in a nonuniform electric field.
AFM scanning and electrical properties of SWCNTs show that the method can achieve the effective assembly of carbon nanotube field effect transistor.
Introduction A single-wall carbon nanotube (SWCNT) has been found as promising materials for nanoscale mechanical structures, because of their typical one-dimensional structure and unique properties [1].
L// was the depolarization factor, σ was the conductivity, and ω=2πf was the angular frequency of the alternating current electric field.
The deposition time was 10s, which affected the number of SWCNTs assembled.

Properties of Si, 4H-SiC, GaN.
Because of having similar bond strength of Si-C bonds, these SiC polytypes exhibit similar mechanical properties, such as hardness.
Because of the minor difference in the growth rate on C and Si face, the growth of SiC should be diffusion limited. [29] There are many factors affecting this, such as the partial pressure, intake gasses, substrate tilt angle, and reaction temperature.
These factors will be discussed in the following sections.
Harris, “Properties of Silicon Carbide”