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Environmental factors can induce alterations in thermal conductivity [2].
To investigate the correction coefficient of the insulation thermal conductivity, the factors that affect the thermal conductivity of the insulation material should be confirmed.
The literature indicated that factors influencing thermal conductivity can be categorized as internal factors (such as density, porosity, chemical composition, and manufacturing technique) and external environmental factors [4].
The most important parameter for regulating the mechanical and thermal properties of closed-cell foam is its density[8].
The influence of fiberglass addition on increasing mechanical properties significantly[11][12].

For the welding joints made by pressure welding it is possible to use thermal treatment to increase their mechanical properties (including differential treatment with rail-end hardening in HAZ) [11].
Ferroalloys, mostly ferromanganese, ferrosilicon, ferromolybdenum, ferrotitanium, ferrovanadium, are added to the thermite mixture to improve mechanical properties of the metal.
Ferroalloys enable to get the thermite metal with mechanical properties close to mechanical properties of the metal of welded rails.
Galai, Effect of vibroimpact treatment on the physical and mechanical properties of the surface layer of welded joints in rails, J.
Mikhaylovs, Analysis of factors affecting fractures of rails welded by alumino-thermic welding, J.

Olawale et al. performed correlation of process variables in shielded metal arc welding (SMAW) and post weld heat treatment on some mechanical properties of low carbon steel weld.
First, welds tend to be regions of weakness in a structure due to stress concentration effects and poor material properties.
These mathematical models show the dependency of the mechanical properties of the steel sample on the design variables which are welding speed, welding current and electrode diameter.
For two factors interaction, input combination of welding speed and electrode diameter has the highest F-value of 114.56 and thereby most significant on the tensile strength property.
“Effect of heat treatment on mechanical properties and microstructure of NST 37-2 steel” Journal of Minerals and Material Characteristics & Engineering, 10: 299-308

As the stone decay is in clear relation to its hygrothermal and mechanical behavior, there is necessary to characterize thermal, hygric and mechanical properties of the stone materials that are typical for specific region, where they were used in the past.
Basic physical properties of tested sandstones.
Mechanical properties are summarized in Table 5.
The effect of the porosity (Table 2) on the mechanical properties of the analyzed sandstones was apparent but the mineralogical composition played an important role as well.
Mechanical properties of tested sandstones.

Among biodegradable polymers, PLA has a great potential to substitute petroleum-based plastics because of its high mechanical properties and easy processability compared to other biopolymers.
The strength of composite was influenced by many factors such as the interface adhesion between fiber and matrix, the size and dispersion of the fibers.
Based on the previous research by Mukesh et al. [11], they found that the Young’s modulus of the composites depends on several factors such as fiber orientation, surface waviness and molding temperature.
For the chemical properties, the FTIR test shows the presence of hydrogen bond with the existing of RS.
Fu, Mechanical and thermal properties of poly (lactic acid) composites with rice straw fiber modified by poly(butyl acrylate), Chemical Engineering Journal 166c (2011) 772-778

It is worthy to pointing out that the key factor which affect on the properties of diester magnetic fluid is the exact time of mixing second surfactant and the reacting temperature.
Results and Discussion Properties of Diester Based Magnetic Fluid.
Fig.4 Environment temperature versus Viscosity of Diester Based Magnetic Fluid Influencing Factors.
During the procedure of preparation, there are several critical influencing factors which affect on the size of prepared magnetic nano-particles and on the properties of diester based magnetic fluid.
Secondly, reacted temperature and speed are two other influencing factors for preparing diester based magnetic fluid.

The working principle of the piezoelectric feeder was analyzed, the kinetic model was established, and the main factor which affects the delivery performance of the resonant feeder was obtained by calculation, and then designed the prototype.
Under the same condition of structure and size, the displacement range of the synthetic mechanical properties of the two ring magnet is larger.
When the mechanical system reaches its resonant frequency, the material conveying speed of the resonant feeder is faster; when the mechanical system deviates from the resonant frequency, the conveying speed is slower.
Getting the factors affecting on the displacement amplification of the resonance feeder system by theoretical analysis.Keep the other rigidities unchanged, adjust the mechinal system's rigidity by the means of adjusting the axial gap of the magnetic springs, reach the resonant frequency of the whole mechinal system to makes the resonant feeder work under the best condition.
The analysis of working property for magnetic spring[J].Equipment design and maintenance,2003(6): 73～74.

These factors may directly affect the electrical properties of the 0.1(Bi0.5Na0.5)TiO3-0.9BaZrO3 samples.
These factors may directly affect the electrical properties of the 0.1(Bi0.5Na0.5)TiO3-0.9BaZrO3 samples.
Abiyev, Pyroelectric properties of (Bi1/2Na1/2)TiO3 ceramics, Ferroelectrics 56 (1984) 215-217
Yin, Electric properties of (Bi1/2Na1/2)TiO3–BaTiO3 ceramics, J.
Bhalla, Piezoelectric and strain properties of Ba(Ti1-xZrx)O3 ceramics, J.

Results and discussion 3.1Morphological analysis A good dispersion of the nanofiller into the polymeric matrix is a key factor in improving the mechanical properties of the LPA6/OMMT composites[14].
Fig. 3Effect of clay content on XRD patterns of PA6/PS/EPR matrix nanocomposite. 3.4 Mechanical properties Mechanical properties of materials are closely related to the perfection of crystallization of the Matrix and the interfacial adhesion force of the Matrix and the filler,what’s more is dispersion of the filler in the matrix[21].
The mechanical properties of low melting point LPA6/OMMT blends,such as tensile strength(σb), flexural strength(σf),Notched impact strength reported in Fig4, Fig5,Fig6, respectively.
Structural and mechanical properties of polymer nanocomposites.Mat Sci Eng R 2006;53(3–4):73–197
[20] Kojima Y,Usuki A, Kawasumi M, Okada A, Fukushima Y, Kurauchi T,et al.Mechanical properties of nylon 6-clay hybrid.

It has high insulating strength, good mechanical properties, fire prevention, moistureproof etc.
The internal structure of transformer is more complex, inserting a large inlay (the body), which demands more anti cracking properties of materials.
The forming process of product would be influenced by external environment and other uncertain factors, which requires the processing properties of materials is good, exhibiting broad applicable scope and reducing the effect of uncertain factors’ degree and range.
The common process parameters were shown as follows: Table 3 Process parameters Process Parameters silica pre-drying process （70~150）℃/(5~20)h，then cooling to（20~70）℃ in the furnace body pre-drying process （100~150）℃/（5~20）h mold heating temperature （100~150）℃ Pouring speed （0.5~3.5）kg/min The quantity and holding time of pressure (0.2~0.6)MPa，keeping time（20~50）min Curing process （100~150）℃/（10~30）h， then cooling to room temperature in the furnace 4 Analysis of the factors affecting partial discharge experiment The biggest quality problem of casting transformer is partial discharge experiment ineligible.
The existence of internal partial discharge may result in the dielectric properties of the insulating medium exacerbation and the insulation breakdown ultimately.