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The holes of the ceramic are full of aero gel particles whose grain size is 10 ~ 20 μm and the distribution of pore size is ten-seventy nm.
The pores formed by the fiber have been filled with a large number of SiO2 aerogels as Figure 1(b) show.
As can be seen by the microscopic structure, after compositing with aerogels, the original large numbers of micron- millimeter holes are replaced by a large number of low thermal conductivity of SiO2 aerogels.
It is equal to set infinite number of hot-covering plates on the transmission way of thermal radiation.
And the increasing number of twists and turns of aerogels hole wall will cause the absorption of infrared rays and diffuse in different direction and suppress the heat radiation.

Therefore, the number of composite samples was developed by varying the filler weight percentage (15%, 25%, 35%, and 45%) in an epoxy polymer.
Agricultural waste in the form of walnut shell was characterized by the determination of grain size.
Fig. 1 Grain size distribution of walnut shell Density: To fulfill the market demand for lightweight materials, the developed biocomposite was characterized for density measurement as a special function of filler weight fraction.

High temperature will significantly form new grains and give elevated hardness value after solidification On the other hand, the maximum number of hardness is at point 2 by parameter of A2 B1 C1 (1800rpm, square tool, 10 mm/min) which is 50.7 HRB.
In contrast, the minimum number of hardness which is 20.2 is at point 1 by parameter of A1 B2 C1 (1500rpm, tapered tool, and 10mm/min).
The reason why the cylindrical threaded tool profile gives the minimum hardness number is due to its tool geometry.
§ The maximum average hardness number is produced at 2000rpm, square tool, 200mm/min while the minimum average hardness number is produced at 1800rpm, cylindrical threaded, 10mm/min which are 40.06 HRB and 30.84 HRB respectively
§ The maximum number of hardness is produced at highest rotational speed and welding speed

It can hold stable MIT switching properties after a large number of thermal cycles (more than 102).
And yet, the increase of the grain size by thermal influence will still have an impact on the phase transition.
The tested film was homogeneous and compact with grain size about 50 nm.
The phase transition in VO2 thin film can maintain well after a huge number of thermal cycles.
Grain size effect on the semiconductor-metal phase transition characteristics of magnetron-sputtered VO2 thin films.

The grain size distributions of pearlite and MMC were shown in Table 3.
All of the grains of the commercial pearlite are less than 40 mesh.
Because MMC is brittle, only 24 to 31% of the grains of pulverized MMC are less than 40 mesh.
Table 3: the grain size distributions of pearlite and MMC (wt. %).
This probably results from the smaller grain sizes of MMC, which may be the reason that the three types of MMC-P have a lower AFP.

Proposed methods of pre-machining the substrate material comprises plastic deformation which increases the number of defects on its surface.
This surface structure considerably increases the number of crystalline defects emerging in the surface of the substrate material.
A considerable deformation of the surface generates structural defects, namely dislocations and grain boundaries.
A great number of adhesion zones is observed on the surface.
This is connected with the enhancement of chemical interaction due to a large number defects appeared on the surface.

Some Si particles are distributed along the grain boundary (Fig. 1a).
Viewed from [011]Si zone axis, the Si particle appears to be twinned (Fig. 1c), although the number density of Si twins appears to be low.
Fig. 3b was enlarged from one area as marked with a dashed line in Fig. 3a, showing a Al2Si2Sr particle at the grain boundary.
Fig. 6 shows a faceted Si crystal on the grain boundary in melt spun Al-5Si-6100 ppm Yb alloy.
Again, Si twinning was observed, although the number density of twins was reduced compared to the Si twinning in melt-spun condition.

The smoothness, glossiness, and grain of the surface of the mould were important in ensuring the high quality of the films, with smooth faces that were possible to cut and etch.
The viscosity generally increased with number of grinding cycles (Fig. 2c).
Increasing the number of grinding cycles generally improved the tensile strength of the OW films.
Figure 2: The effect of the number of grinding cycles and mixing temperature on (a) tensile strength and (b) elongation at break of the OW bioplastics.
(c) shows how the viscosity was affected by increasing the number of fibrillation cycles.

Table1 The dimension and numbers of sample Processing project Planning Sanding Shaping Drilling Mortising Crosscutting Dimension：thick× wide ×long [mm] 19×102×910 10×102×305 19×76×305 19×102 Numbers of samples [piece] 30 30 60 Testing and Evaluation Method.
At the same time, weighted-average number was determined by process's impact on product quality, weighted-average number of planning, sanding, crosscutting and shaping was 2 and weighted-average number of mortising and drilling was 1.
The comprehensive marks were the sum of the test marks of per process multiplied by the corresponding weighted-average number, full marks 50 points.
According to the criteria ASTM D1666-87, a hollow chisel was used to process the connected square mortise and it was as far as possible to make two edges of mortise perpendicular to the wood grain and other two edges parallel to the wood grain in processing.

Detection Analysis Grain size analysis Particle size of dioscorea fiber sample after mechanical activation was analyzed by laser granulometer.
The grain size of the fiber after mechanical activation showed a narrow and single peak distribution.
There are a large number of oxygen bonds between and within the molecules of cellulose, forming a high poly state.
The number of collisions per unit time of AGO-2 planetary mill is shown in Eq. 2 [17]
The spacing between the crystal surfaces of the dioscorea fiber crystal zone becomes wider, and the proportion of unsaturated bond in the total number also increases.