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Introduction With the increase of mining depth, the number of coal bumps also showed a trend of increasing.
The false roof of No.5 coal seam made by mudstone had the thickness of 0.6m, thickness of immediate roof made by fine-grained sandstone was 7m, the upper roof was fine sandstone with the thickness of 10.4m, the immediate floor was mudstone and thickness was 2m, the old floor was silt-finestone.

To further suppresse C, N aggregate in the grain boundaries to form carbonitride chromium compound, usually molten steel was fed titanium wire in VOD refining process.
In the prerequisite of Ca / Al> 0.13% , By blowing hydrogen for flexible stirring before feeding titanium wire to discharge CaO·SiO2 and Al2O3·SiO2·CaO inclusions, the number of two-phase inclusion CaO·TiO2-MgO·A12O3 could be effectively reduced.

Steels obtained this way are always characterise by their martensitic-bainitic structure and the high strength properties are a result of wide refinement of grains, a high degree of cold working and very high density of dislocations, which have the effect of strain hardening [3,4].
Parameters for carrying out welded joints with S960QL steel Joint type Run number Current [A] Arc voltage [I] Wire feed speed [m/min] Shift speed [mm/min] Gas flow volume [l/min] Amount of heat input [kJ/mm] V-joint 1 150 19.5 5.5 210 14 0.67 2 260 27.0 7.5 450 14 0.75 I-joint 1 260 27.0 7.5 450 14 0.75 2 260 27.0 7.5 450 14 0.75 Fig. 1 shows the transverse metallographic microsections of investigated V-joints and I-joints using S960QL steel.

Introduction The crystal structure is called anisotropic or textured when some fraction of the grains within a metallic structure is oriented in one or more preferred directions.
The calculated volume fractions of the main texture components were seen to be more unequivocal in describing the texture variation than maximal texture numbers.

The numbers of nodes and elements are shown in talbe1 and the FE model is shown in figure 4.
We surmise that the different decolorization behavior of methyl orange using pure and doped ZnO films might originate from the different microstructure changes upon high temperature annealing, i.e., ZnO microcrystalline grain grows at high temperatures while Mn dopants in Zn1−xMnxO films may transit from substitutional to interstitial sites at high temperatures, as hinted from XRD measurements (not shown) and earlier reports [23].

The principle of this method is to identify area of “gray” in the studied virtual surface that is divided into a number of deformable facets under the action of external forces.
References [1] Becker, T., Splitthof, K., Siebert, T., Kletting, P., Error Estimations of 3D Digital Image Correlation Measurements, The International Conference Speckle06 “Speckles, From Grains to Flowers”, Nimes, France (2006)

Then computer is put into use, and a large number of computer softwares come into being.
Data Structures, Data Types and Abstract Data Types, Journal of Jilin Grain College, 2005(6): 14-16

Reinforced materials mainly glass fiber, carbon fiber, boron fiber, agamid fiber, silicon carbide fibers, asbestos fibers, whiskers, wires and hard fine-grained and so on.
Collected from time to time in the Internet of Things sensor information transmitted over the network, because of its very large number, forming a mass of information, during transmission, must adapt to a variety of heterogeneous networks and protocols, in order to ensure data accuracy and timeliness of it, and is presented by one figure as equation 2

The density of geometrically necessary dislocations (GNDs) decreased with the increase of indenter load and the density of statistically stored dislocations (SSDs) showed a dependence on the grain size of β phase which mainly contributed to the variation of microhardness regardless of indenter load for the Ti-1023 titanium alloy [10].
Cheng and Tunvisut [18,] [19] used dimensional analysis to propose a number of dimensionless universal functions.

Introduction Windmills have been used for at least 3000 years, mainly for grinding grain or pumping water, while in sailing ships the wind has been an essential source of power for even longer.
System specification of vertical axis wind turbine Blade Length 2.5 m Rated Rpm 160 rpm Rated Power 0.5 kW Rated Wind Speed 8 m/s Number of blades 5 Material Glass/Epoxy laminates + foam core sandwich Fig. 2 Designed configuration of wind turbine blade Fig. 3 Stress and natural frequency analysis result of wind turbine blade Fig. 4 First and Second buckling mode shape of wind turbine blade Fig. 5 Joint part stress analysis result of wind turbine blade Blade Manufacturing and Strength and Damage Test In manufacturing, the hand lay-up and the matched die molding methods are applied.