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Thus alloying is an effective method to improve the mechanical properties of Al-Si alloys.
Therefore, for a given composition, it is the ability to optimize structural factors.
A number of factors define the metallurgical structure in Al-Si castings and that determines the properties.
Dobrzański, et al., Microstructure and mechanical properties of AC AlSi9CuX alloys.
Boonjubut, et al., Study of factors affecting artificial aging of 6061 aluminium alloy by factorial design, Review of Integrative Business and Economics Research 3 (NRRU) (2011)

The mechanical heterogeneity has been estimated by the micro hardness test.
The data for crack size in weld and heat affected zone was obtain from microscopic observation, and for mechanical properties from microhardness testing.
So for velocity of crack the dimension factor used was equal to 100.
The mechanical heterogeneity could be estimated by micro hardness test.
One of the good methods of nondestructive testing could be microhardness control of the weld and heat affected zone to avoid the significant modification of mechanical properties of welded structures.

Flocculation process is a method of ballast water treatment process which can satisfy the security, effective, environmental protection, operation and economic request , on the treatment of ballast water has been studied widely at home and abroad .The paper summarizes the flocculation process application treatment about ballast water of ship, introduced the affecting flocculation process factors , and discussed the application prospect of flocculation technology in ballast water treatment application field .
There are mechanical treatment, physical treatment, chemical treatment, quantitative ballast and other methods divided into ballast water treatment methods at present, among them the chemical method is widely applied[5].
The clay mineral types, structure and surface properties are the agglomerate factors effect on the harmful algae, and the bentonite is the best among other clay minera; the removal rate related to whether clay minera can form floccule with harmful algae or the size of "floc formation" , the floc forming larger with higher removal rate.
Else M test research on combined electric flocculation with flocculation sediment technology which based on electric flocculation experiment, Electric flocculation process also act a good effect on removing efficiency of total phosphorus in seawater, which increases with the current density and the electrolysis time extend; the residual concentration of total phosphorus in seawater and electrolytic current was first order reaction relation, and study the factors which affecting the flocculation removal of CODMn in seawater, extending the time of power on and improve the current density was favorable for CODMn removal.
The affecting flocculation effect factors: l The influence of the flocculant type.

The results showed that adding some nano-ZnO powder in paint did not affect the mechanical properties of the coatings, but it influenced obviously the surface topography and characteristics.
Some research has demonstrated that many other factors are of equal or greater importance than the surface energy.
These properties can meet to the general need of antifouling paints.
Based on the above-mentioned results, it can be obtained that adding some nano-ZnO powder in paint did not affect the mechanical properties of the coatings, but it influenced obviously the surface topography and characteristics.
Adding nano-ZnO powder in paint did not affect the mechanical properties of the coatings, but it is easy to get hierarchical porous rough surfaces.

Tensile strength test measures the force per unit width of the test and evaluates the changes in tensile strength changes due to factors such as fiber strength, fiber length, and bonding.
The main factors that define paper strength are cellulose fibrils, microfibrillar angle and fiber damage and defects.
Fibers can be deformed to improve paper properties such as changes in fiber network properties but deformation also causes fiber damage.
Disturbances affecting the microstructure and macrostructure of the paper cause the paper to break easily and this can be detected by the mechanical tensile test.
Summary This study examined the relation between the changes in physical and chemical properties during paper biodegradation.

In order to ensure the functions and properties of the mechanical system, more attentions should be paid to mechanism of vibration and friction during the process of designing and manufacturing the modern machine.
More attentions should be paid to the vibration and friction mechanism during the process of designing and manufacturing the modern machine, just for ensuring the full functions and properties of the mechanical system [1].
Besides above factors, the dynamic load, vibration frequency and amplitude will affect dynamic characteristics of joint surface. ⑵ The static characteristics of joint surface can be simulated by some nonlinear springs.
Hua zheng [18] and Zuoying zhang [19] have researched the factors which affect joint surfaces’ noise characteristics by some vibration tests.
The mechanical system assembly precision will be affected by each joint surface.

The effect of PTFE on the mechanical and friction and wear properties of GF/PA6 composites Jian.
It is getting more clearly that additional PTFE additives in matrix could improve matrix-dominating mechanical properties.
However, when the concentration of a PTFE is above the saturation level, only a part of the molecules locates in the interfacial area and the excess is dispersed in the matrix affecting its homogeneity and consequently the mechanical properties of the composite.
Conclusions (1)The mechanical properties of PA6 composite increased with the addition of GF.
And the addition of PTFE further improves the mechanical properties of GF/PA6 composite.

China; a wanailan@mail.dhu.edu.cn, b wdyu@dhu.edu.cn Key words: Wool; DFE; Hairiness; Pilling; Single Jersey Abstract: The properties of wool fibers treated with chlorine (Basolan® 88 and Kroy-resin) were compared with surface modification observed by scanning electron microscopy (SEM), frictional properties and mechanical properties.
The important subject involving the mechanism of pill formation and factors affecting it have been drawn attention to by many researchers since the mid-1950s.
Fabric pilling is affected by many interacting factors.
Many researchers have investigated the influence of fiber and yarn properties[3] and have identified numerous factors which cause the fuzzing and pilling of wool fabrics.
Table 2 shows the differences of mechanical properties between the untreated and treated wool samples.

The uniform microstructures and mechanical properties of the steels can better satisfy the requirement of production.
Mechanical properties of experimental steels are shown in Fig.1.
Mechanical properties and microstructures of simulated HAZ.
The No.1 steel was employed to evaluate the weldability because of its good mechanical properties and better economical effectiveness.
Mechanical properties such as strength and toughness were tested with the same method as mentioned.

Mohtadi-Bonab et al. [28-29] investigated the various factors affecting fatigue crack growth in pipeline steels.
Results and Discussion Mechanical Properties.
Normalized properties of the API 5L X42 steel.
Further research is needed, especially for the interaction with external factors such as environment, temperature, or combined damage mechanisms.
Effect of structural anisotropy of ferrite-bainite pipe steel on mechanical properties in tensile and impact bending tests.