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The immediate roof is aluminum mudstone, its thick is 1.06m, the old roof is the gray massive mudstone, its thick is 7.0 ~ 9.15m, and the average is 8.35m; the direct floor is aluminum mudstone from gray to dark gray, its thick is 1.01 ~ 1.99m, and the average is1.50 m, the old floor is off white medium grained sandstones with massive no bedding, and its thick is 2.22m.
Table 1 The technology parameter table of hydraulic support with integrated roof beam of ZH2000/24/32Z (K) type Name Unit Parameter Remark Height of support mm 2400～3200 Length of support mm 3000 Central Distance of support mm 1000 Diameter of brace mm 125 Number of brace Piece 4 Pace of advancing support mm 800 Working resistance KN 2000 Early Support strength KN 980 Support intensity MPa 0.595 Control pattern Centralized control Support Weight ton 2.0 Unit maximum Weight ton 0.9 Pump pressure MPa 20 working liquid M10 of emulsion density is 2% Transporting System Selection.
Table 2 Improving device model table of transport system name Specification model unit number Main technology scraper conveyer SGW－40 Per three · Voltage 660V，rotate speed 1470r/min，maximum length 100m，capacity of conveyor 150T/h。
Usually divide into groups when initiation, and the maximum length of initiation (or the number of blast-holes) increased by group, which should meet the requirements of the empty top area, transportation capacity and gas emission Quantity when multi-group initiation.
The initiation sequence is began in the conveyor lane to dividing into groups along the working face, sequence blasting, each group line up according to the number of the detonators, each group had eight blast-holes, which can increase or decrease depends on the actual situation.

The solidified grain structure strongly depends on the thermal gradient (G) and cooling rate (R).
Location of SLM processing region on the G vs R map created by Bontha et al. [13] The width of the columnar grain in blown powder laser metal deposition process is found to increase with an increase in incident energy and decrease in traverse speed due to the decrease in the cooling rate [14, 15, 16].
This anisotropic behaviour is believed to arise from: (1) planar distribution of porosity and (2) preferred grain orientation of the columnar structure.
No significant difference in ultimate strength between vertically and horizontally built specimens was found, however, the yield strength and elongation were still lower in the vertical specimen, which is attributed to the preferred grain orientation of the columnar structure.
Additive manufacture is defined by a steriolithographic (STL) file that represents the component surface with a finite number of triangular facets.

A large number of engineering practices show that geosynthetics can effectively save engineering materials, reduce engineering costs, protect the environment, and achieve better economic and environmental benefits.
[2] Ran Wuping, Chen Huiming, Huang Jiangjun, Li Ling, Ai Xiangchen, Study of decay law of dynamic resilience modulus of coarse-grained soil subgrade in freeze-thaw cycle, Journal of Dalian Universtity of Technology. 61 (2021)180-188
Ai Xianchen, Study of decaylaw of dynamic resilience modulus of coarse-grained soil subgrade in freeze-thaw cycle, Journal of Dalian University of Technology.61(2021)180-188
[25] Chen Zhong-da, Chen Dong-gen, Chen Jian-bing, Dong Yuan-hong, Zhang Ke, Influence of Freezing- thawing Cycle on the Modulus of Resilience of Coarse-grain Fill with Different Water Contents, Journal of Zhengzhou University (Engineering Science).35(2014)9-13
[28] Zhao Wen, Wang Xiaojing, Xu Zhengxuan, Fu Wenli, Jiang Shiyin., Experimental study on natural evolution characteristics of coarse-grained soil slope in seasonal frozen soil region, Journal of Engineering Geology. 29(2021) 1497-1506

Table 1: Tested IF samples and their mechanical properties (grain size, thickness, Rp0.2, Rm) and the date of processing of the coil.
The grain size has been determined by microscopic analysis.
Sample ID Steel Grade Grain size (ASTM) Thickness (mm) Rp02 (MPa) Rm (MPa) Date coil A IF 9.5 1.000 148 302 03jan2000 B IF 9 0.990 186 285 28feb2000 Figure 3: Stress induced anisotropy in Fe crystal for compressive and tensile stresses along the [001]-direction (left plot) and the [111] direction (right plot).
Numbers are not directly comparable to those of table 1, since they have been obtained with different methods.
Roughly 50% of the grains are oriented according to these directions.

The samples sintered using the finer powders fractions (Fig. 5) showed spherical pores concentrated at the grain boundaries.
For the sample TiH2 <45 μm at 1300 ºC (Fig. 5), the pore migration was observed from the boundary to the interior of the grain, which is an unfavorable condition for the densification through diffusive processes.
The increase in temperature led to the increase in average grain size for all samples, which may cause a detrimental effect on the mechanical properties.
The coarsening of the mean pore size was also observed with the decreasing number of pores.
The sintered samples showed homogeneous microstructure of a grains and porosity tending to spherical decreasing with the reduction of particle size.

Due to the presence of rare earth oxides, grain growth can be inhibited, which is advantageous for forming a dense nano-scale fiber structure and improving the wear resistance of porcelain.
As the number of nucleus charges increases, the outer layer of O and P layers has almost no change in structure, and the added electrons are filled into the inner sub-layer orbits that are not yet filled.
It can inhibit grain growth and improve the gloss of glaze and act as a brightener.
The product is highly efficient, non-toxic, durable and heat-resistant, and has good compatibility with human habitats. 3) Mixed rare earth oxides can inhibit grain growth during ceramic sintering, reduce grain size and increase ceramic density.

In Air In target gas Hole accumulation layer qV s11 (a) (b) holes O - Grain boundary Grain boundary 2CO + O - = 2CO 2 + e - CO CO 2 R O - O - O - O - O - O - O - O - O - O - O - O - O - O - O - O - O - O - and/or 2H 2 + O - = 2H 2 O + e - CuO (CO 3 ) 2 - qV s21 holes Grain boundary Grain boundary R qV s22 holes qV s12 holes O - O - O - Physical model Energy band diagram CuO/Rb 2 CO 3 Oxygen ion Rb 2 CO 3 Energy barrier Energy barrier Energy barrier Energy barrier e - e - CO CO 2 CO 2 e - Physical model Energy band diagram Neutral region Fig. 8.
Acknowledgments This research is funded by Le Quy Don Technical University Research Fund under the grant number "24.1.24".

Large agglomerated grains were uniformly distributed and adhered to the substrates well.
High porosity, voids, and trapezium-shaped grains are also available in large numbers, and a more effective surface area has been observed for oxygen species adsorption.
A deep charged depletion layer forms across the grain boundaries of ZnO and CuO in a gaseous environment, resulting in p-n heterojunctions.
The Field emission scanning electron microscopy micrograph shows high porosity, voids, and trapezium-shaped grains as well as small particle size.

Small grain sized microstructure containing finely distributed hard carbides give rise to a surface coating having excellent combination of hardness and toughness.
Surface areas on the specimens 2.5×1.8 mm² were randomly chosen to show a huge number of carbides randomly distributed within the matrix.
Finer precipitations are formed in hardfacing sample with short cooling-off time M10C, where also small precipitations on grain boundaries [27] can be observed (Fig. 2a).
Other material properties like ductility, residual stresses and grain size [30] may have higher importance on the behavior under combined impact/abrasion.
[30] Da-yong Wu, Fu-ren Xiao, Bin Wang, Jia-ling Liu, Bo Liao, Investigation on grain refinement and precipitation strengthening applied in a high speed wire rod containing vanadium, Mat.

For highly elastic anisotropic metals, applied loads will cause stress concentration at the grain boundaries and at the triple junctions, which can lead to brittle failure [8, 9].
In addition, since different crystal structures have different symmetry, the number of independent elastic constants for different crystal structures is also different.
(5) In these formulas, h indexes Planck's constants, k is Boltzmann's constants, NA indexes Avogadro's number, ρ is density, M stands for the weight of unit cell, n is the number of atoms in unit cell. νm is averaged elastic wave velocity, υl and υt refer to the longitudinal and transverse sound velocity, respectively.
(7) where, kB, NA, ρ, and E are the Boltzmann’s constant, Avogadro's number, density, and Young's modulus, respectively.
[5] FuZhi Dai, Yanchun Zhou, Wei Sun, Segregation of solute atoms (Y, Nb, Ta, Mo and W) in ZrB2 grain boundaries and their effects on grain boundary strengths: A first-principles investigation.