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The number of dredged silt poured from coastal areas was more than 30 millions cubic meters in 1997, and the number rapidly increased to 100 millions cubic meters at the beginning of the century.
Their grain diameter was less than 0.9 mm and the modulus of fineness was 0.8.
Number and place them under a shaded area to dry them naturally (about two days and two nights).
Two kinds of waste residues in the composite sea mud have different water volume demands because they have different grain sizes.
Table 3 The liquid-plastic limit and plastic index of sea soil addition of iron tailing or fly ash Number of Sample WL (%) Wp (%) Ip Number of Sample WL (%) Wp (%) Ip H100 45.4 23.0 22.4 H100 45.4 23.0 22.4 H95F05 43.6 23.6 20.0 H95T05 45.2 22.0 23.2 H90F10 47.5 22.5 25.0 H90T10 43.4 22.1 21.3 H85F15 45.9 22.2 23.7 － － － － H80Ｆ20 43.8 24.2 19.6 H80T20 40.0 18.6 21.4 Based on the above analysis, reducing the volume of blending water during blank molding lessens scumming degree of sea mud sintered brick to a certain degree.

Characteristics of gas emission in Yongshanqiao Mining Area Coal Mine Yongshan Yangou Xiancha Number of samples 79 21 33 Average elevation (m) -257 -231 -294 Mean value of Q (m3/min) 3.452 2.271 2.213 Mean value of q (m3/t) 26.509 14.312 14.644 Trend value (-250m elevation) of Q (m3/min) 3.243 2.550 1.840 Trend value (-250m elevation) of q (m3/t) 25.532 16.170 12.707 Note: Q: Absolute Gas Emission Rate; q: Relative Gas Emission Rate Along the dip of coal seam, Fig. 2, 3, 4 are the statistical information about gas emission of representative mining districts at Xiancha Coal Mine, Yangou Coal Mine and Yongshan Coal Mine.
Table 2 shows the noticeably increased likelihood of coal and gas outburst from east to west according to the data of the increased outburst number, the increased maximum value of outburst coal and gas, and the increased number of super large outburst.
Characteristics of coal and gas outburst in Yongshanqiao Mining Area Coal Mine Yongshan Yangou Xiancha Number of outburst 98 47 13 Mean value of outburst coal (t) 206 248 91 Maximum value of outburst coal (t) 3988 2400 587 Maximum value of outburst gas (1×104 m3) 16.7 15 1.5 Maximum elevation of outburst (m) +60 -60 -35 Number of super large outburst 4 1 0 Table 3, 4 are the statistical information about coal and gas outburst of Xiancha Coal Mine and Yongshan Coal Mine in different mining depths.
At the same time, the grain size of rock in the coal bearing stages tend to be smaller from east to west.
The trend of thicker coal bearing stages and smaller grain size of rock is more conducive to the preservation of gas [5].

It is probable that a sol-gel spin coating process at 200 °C produced dense, irregularly shaped Bi2O3 grains.
With metal ions doped into Bi2O3, the particle size and grain shape can be improved while the structure can be stabilized.
In JCPDS file number 81-0563 [20], 10.25 Å is reported after annealing the film, and the results of XRD are in good agreement.
The figure shows several dense morphologies along with fine-grained microstructures.
It is likely that Bi2O3 grains were formed in dense irregular shapes using a sol-gel spin coating technique at 200 °C.

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.

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.

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.

(11) Where 1z is the first nearest-neighbor atoms. 1vz is the number of first nearest atoms above the same plane (vertical direction). vapH is the difference between the vaporization enthalpies of the two pure elements, AB vap v v H H H      . subH is the difference between the sublimation enthalpies of the two pure elements, AB sub s s H H H      .
There are four types of diffusion: surface, grain boundary, dislocations and lattice (bulk) [27-29].
Assuming no size and shape effects on 0,D  , the diffusion coefficient at the nanoscale can be evaluated by [30]:   , 1 0,, shape mCT RT D D L T D e           (16) The creep can begin when the grain boundaries can move over distances of the order of the grain size by diffusion processes.
The rate of diffusion along the grain boundaries is limited by the emission and absorption of atoms at grain boundaries.
This process needs energy to emit and absorb atoms at grain boundaries resulting in a threshold stress.

Generally, it may take a number of impacts before a force sufficient to propagate a fracture, is applied.
Rock can break in one of three ways: by splitting apart inherent flaws – cracks, grain boundaries, dislocations; by fracturing across a grain (inherent rock strength); and by attrition in which fine particles are ripped from the bulk material.
This S.S.A. is about 100 times more than one would expect for spherical magnetite grains of 1.5 mm in diameter.
At low velocities, the primary mode of failure is crack propagation along grain boundaries or within grains.
For flotation, grain-boundary and crack propagation is preferred while for leaching, attrition may be preferred.

The characteristics of reactive aggregates such as particle size distribution, grain size and shape also impact the expansive effect [10].
Characteristics such as dimensions, grain shape, texture, alterations, and deformations of the rock can indicate its susceptibility to chemical reactions. 3.1.1 Basalt aggregate sample.
On the other hand, quartz occurs in the form of relatively small interstitial grains.
It is composed of several grains of the same mineral species, with no significant variation regarding the size of the fragments.
The number of internal pores in the limestone sample presented a significant decrease, which is explained in the study of Nagrockienė and Rutkauskas [14], where it was found that the use of mineral additions, among them CV, makes the structure less porous and consequently hinders the accommodation and percolation of the gel.

On the contrary, MgB2 films deposited with higher B2H6 gas mixture flow rates generally have larger grain sizes than those grown with lower flow rates.
Films deposited with 25-sccm B2H6 gas mixture flow are smooth with the rms roughness of 25-40 Å and grain sizes about 0.1-0.2mm.
MgB2 films with the thickness up to 2000 Å grown at higher B2H6 gas mixture flow rates are also smooth, but with larger grain sizes.
Structurally, the doped films are textured with columnar nano-grains and highly resistive amorphous areas at the grain boundaries.
The thickness and the number of depositions for each fiber is also reported MgB2-based heterostructures We report structural and transport proprieties of MgB2/MgO and MgB2/AlN multilayers for MgB2 Josephson junctions.