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Principal component analysis is used to identify four major factors of coal gangue applications in road construction.Put forward 5 urgent problems to be solved and give a few corresponding suggestions.
It also brings about economic, environmental social benefits.[6] Material properties Road materia experiments were conducted on coal gangue which piled up the life of 10 years, the data obtained are as follows(The following values for the mean test multiple samples,see Table1): Table1 Coal gangue various properties and numerical data Material properties Obtained numerical data Description Density 2.44 g/cm3 Grain size distribution Well graded particles Easy to obtain large density, with low compressibility and high strength Crushing value 29.1% <30%, indicated that’s easy to be crushed, after rolling surface is smooth and dense Slake durability index 96.25% Index is higher, the resistance of softening and disintegration is better Expansivity Particles below 0.5mm 18% All are less than 40%,showed that it is non expansive Particles below 5mm 27% Particles above 5mm 32.1% original sample 26% Liquid limit index 31.06% <50%，meet the requirements Plastic limit index
Find the crucial influencing factors Four crucial factors can be summarized from general factors by Principal component analysis(PCA) in order to reveal the crucial influencing factors of coal gangue application development in road engineering in China.On the basis of collecting and analyzing relevant literature and data, also consulted experts,Table2 lists 22 general influencing factors of coal gangue application development in road engineering.
(see Table2 ) Questionnaire survey combines with software SPSS elicited 4 major influencing factors from following 22 general factors, specifically as follows: - Government support (including C8,C9,C10,C11）; - Research, development and promotion of technology (including C4,C5,C6,C7,C17,C18,C19); - Quality of professionals (including C12,C13); - The level of supply and demand (including C1,C2,C3,C14,C15,C16,C20,C21,C22).
Their technical level affects the overall engineering quality.

Decisive properties in choosing the materials to be applied include mainly the coefficient of thermal conductivity, volume density, compressive strength and water absorption.
Value of the thermal conductivity is however not constant, it is influenced by many factors.
Due to the thermoplastic properties of polymers the composite material is produced in electric furnace.
The weight ratio and the mutual arrangement of layers of binder and filler affect the thermally technical and mechanical properties of composite.
Measurement of properties of samples was done by a straight probe with a range from 0.04 to 0.30 W/mK.

The densification and mechanical properties of the ceramics can be ameliorated obviously and the microstructure defects of the ceramics decrease.
Introduction Silicon carbide has been recognised as an important structural ceramic because of its predominant properties.
Properties and microstructure of SiC ceramics.
The sintering properties of final SiC sintered body before and after treatment are shown in Table 3.
The densification and mechanical properties of sintered body can be ameliorated obviously and the microstructure defects of the ceramics decrease.

Glass mirrors are normally fabricated by mechanical processing involving grinding, lapping and polishing.
The influencing factors on the removal function include the properties of the work material, input RF power, working distance of the plasma jet from the machining surface, flow rate of the SF6, and the ratio of O2 to SF6.
In the experiment the values for factors listed in Table 1 were varied individually.
This explains why the RF power affects the removal function profile so greatly.
The waviness which exists in the fused quartz surface is the roughness called the ripple which is characteristic in the mechanical polished surface.

It is important to take into account two factors selecting a coating material: the thickness of the coating and coating adhesion to the base.
These factors determine its working lifespan and the distribution of the surface stresses in the coating material and base.
We improve mechanical properties by adding modifying nanoadditives based on spinels such magnesium, chromium and zinc to a polymer composition.
Thus, the process of destruction of coating affects not only the phase composition, structure and mechanical properties of the coating, but also the morphology of the interface region between coating and base.
Preparation and Mechanical Properties of PTFE/nano-EG Composites Reinforced with Nanoparticles (2011) Procedia Environmental Sciences, 10, Part B, pp. 929-935

To-date, research efforts have been mainly focused on electric properties or fracture toughness of piezoelectric materials under fatigue.
The typical material properties are given in Table 1.
Main material properties of PZT-5 The specimens were subjected to a cyclic bipolar electric field together with a static mechanical load.
However, what is the main factor that affects the strength of piezoceramics without initial crack?
It is a known fact that for conventional ceramics, most mechanical properties decrease with increasing porosity.

The results obtained herein suggest that selecting the appropriate annealing temperature become a key factor for tuning the most desired properties from the as-prepared TiO2/ZnO thin films.
There are two factors associated with the band gap change of TiO2/ZnO with the increase in annealing temperature.
This is probably due to the compressive stress of the lattice in a direction parallel to the surface affecting the lattice perpendicular to the surface as earlier discussed.
The author thanks Mechanical Engineering Department, (UiTM) Malaysia for the XRD measurement.
Jagadish, Basic properties and applications of ZnO, Thin Films Nanostructure 1 (2006)

So, GFRP pipe properties for the design such as pipe stiffness (PS) and equivalent modulus of elasticity (Eeq) is complicated to predict or to measure.
Internal pressure performance is affected by glass fiber reinforced polymer plastic layer and the stiffness factor (EI) is affected by polymer mortar layer.
The quantities pipe stiffness (PS) and stiffness factor (SF) are computed values determined from the test resistance at a particular deflection.
Therefore, the theoretical equation may also be used to predict the pipe stiffness factor.
Lee, Mechanical Properties and Structural Behavior of GRP Composite Pipe for Water Supply and Drainage, M.S.

The process of making metallic biomaterials applied to arthroplasty is quite demanding, therefore, is properly specified by the authorities, citing the composition and properties associated with its application.
Specific technical requirements for prostheses deal on chemical composition, mechanical properties and metallurgical requirements, considering the materials as biocompatible, completely free of any adverse reactions.
Therefore, this study aimed to evaluate the chemical, physical and mechanical properties of metallic biomaterials used for making hip prostheses, to identify possible non-conformities that compromise the durability of the implants.
The factor of resistance to pitting corrosion for this alloy was obtained by replacing the percentages of chromium and molybdenum submitted in Table 1 in Equation 1.
As for the percentage compositions of the elements phosphorus and sulfur in steel, had far superior to steel F 138 values and could jeopardize its corrosion resistance and mechanical properties.

The evolution of the property of polymeric membrane exposed to ultrasonic irradiation is followed by the calculation of membrane damage factor (R).
The evolution of the property of polymeric membrane exposed to ultrasonic irradiation is followed by the calculation of membrane damage factor.
The evolution of the property of polymeric membrane exposed to ultrasonic irradiation is followed by calculating the membrane damage factor (R).
Ultrasound has both mechanical and chemical effects, caused by cavitation [4].
Fig. 3 Effect of the height of membrane on the membrane damage factor Fig. 4 Effect of nominal ultrasonic power on the membrane damage factor Fig. 5 Effect of ultrasonic frequency on the membrane damage factor Fig. 3 represents the effect of H on R.