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Studies on new mining process and technology of difficult mining resources, new technology, the development of efficient and intelligent coal mining equipment, propelling the process of fully mechanized mining automation, reducing the underground worker number and the achievement of mining unattended underground face become urgent needs and research directions in the domestic and foreign mining industry [1].
The face of the coal layer 4# coal face strike length of 890 meters, tilt 140 meters in length, and average seam thickness of 1.0-1.3m, recoverable reserves of 282,817 tons; seam inclination 0°~30°, an average of 16°; seam The immediate roof is 1.4m thick limestone directly to the end of a 2.7m thick fine-grained sandstone, coal bed stability, structure, thickness variation.

Introduction An ideal electrode, either for solid-oxide electrolysis cell or solid-oxide fuel cell, is described to possess the following qualities: good ionic and electronic conductor, porous material with a high number of triple points, and chemically stable.
Cervera, Preparation of Porous LSM/YSZ Composite with Varying Grain Size of YSZ Precursor Using Solid State Reaction Method, Mater.

Enhanced current flow is noticeable along the grain boundaries of WO3 nano-flake and the peak current with maximum intensity was clearly identified and its measured value was 248 pA.
This shift indicates the contribution of W5+-states from non-stoichiometric oxide phase of WO3-x in comparison with stoichiometric WO3 owing to the increased number of oxygen vacancies created during the intercalation.

BP neural network has a three-tier structure, namely the input layer, hidden layer and output layer, its structure is as follows[15]: The establishment and application of combination forecasting model based on rough set The establishment of the RSCM.We collect a large number of assessments object data and expresse as a two-dimensional knowledge representation system after discretization.We deem the various forecasting methods as condition attributes，condition attribute set , Y , the forecast object indicators, as decision attribute that .The predicted value and the predicted data of the object's history of the respective prediction methods of the period t is represented as , thereby On the Domain , this case studyattribute value of the object : ,.
[2] Xiao Zhi, Zheng Daxia,Grain Yield Forecasting combination forecasting method based on rough set [J].

Therefore, to increase the durability of a sophisticated cutting tool, coatings with alloying elements are used [1, 2, 3, 4, 5, 6]; today, silicon, aluminum, rhenium and other elements from a number of metals are used as alloying elements.
To increase the wear resistance of the cutting tool, a new method of hardening was considered - discrete diffusion oxidation having a polycrystalline structure with a grain size of 4 μm.

There are a number of dynamic constitutive models for metals under impact loading that have been obtained from dynamic tension, compression, and torsion tests and used to describe the Von Mises flow stressof metals as a function of the equivalent plastic strain, the equivalent plastic strain rate, and the temperature .
For FCC metal, Z-A model is (12) whereis the microstructural stress intensity, is the grain size, ，，， are material constants.

Zavattieri et al. [2] investigated the dynamic fragmentation of ceramic microstructures, in which the open-up and growing of micro-cracks were assumed along grain boundaries.
Normal force (F) acting on an atom (i) on plane (a) from atoms on plane (b) is ∑== n1j ij ij )120( i r d )r(fF (1) where rij is the distance between atom i on plane (a) and atom j on plane (b); d is normal distance between two planes; n is the number of atoms on plane (b), which is chosen to be 22. f(rij) is force between atom i and atom j, defined from Morse potential [10].

Fig. 4(a) is the surface photography of the as-grown ZnO film, from which some accumulated shape consisted by a number of 30nm columns can be seen.
The surface of the film becomes flatter after annealing in air at 550 o C for 1 hour, and the well-regulated grain boundary with hexagonal structure of the columns appeared (see Fig. 4(b)).

Due to high efficiency of heat extraction and massive number of particles that arrives in the preform, associated to the spray atomisation, low temperature can be maintained during the process and deleterious interfacial reactions can be minimised.
It is usual to obtain a uniform microstructure, with fine grains and with little segregation, contrasting strongly with the coarse structure, segregated and dendritic of the materials conventionally cast.

Table 1 3# test drilling geological record table Drilling Depth phenomenon description 0~1.0m gravel (the gravel when filling the pavement) 1.0~2.2m loose strong weathering basalt 2.2~3.8m Drills-down phenomenon, lava hole(cavity) 3.8~4.6m broken, loose strong weathering basalt 4.6~7.2m broken, big pore ratio basalt 7.2~8.8m very broken basalt 8.8~10m complete, Close-grained basalt (2) Small cavity concentrate area: To present the obviously strong amplitude reflection area in the radar profile, but the abnormal reflected wave is mixed and disorderly, arc reflection wave area is smaller, disorderly reflection wave is more and it can't be more present continuously, abnormal reflection wave frequency is higher
Project Serial Number: 2011318346770 References: [1] D.F.