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Basu et al reported that the gas sensitivity of the ZnO sensors decreases with the increase of its mean grain size.
Although a number of ZnO sensors have been reported on detecting different gas, there are still more room of improvement.

Therefore, in order to exclude non-target information of images and get access to the better target ones, formula (3) can be mandated to satisfy. 3.Two-Step Solution of considering the Crack Fractal Law According to the preceding discussion, the optimization problem of formula (3), can be solved through the following ways, and the algorithm steps are as follows: (1) Threshold image segmentation method (such as the Otsu threshold method) is adopted to do coarse-grained segmentation for original image.
It shows that the concrete surface crack curve follows fractal law, with a high fitting accuracy. 4.1 Experiment 1 Spalling of Crack Region Surroundings of concrete cracks are usually accompanied by a number of spalling and peeling.

The coating material is characterized by a high density of formed particles with a minimum number of oxides and pores (1 to 5 %).
The grain size of Ni-Cr powder was 15 – 32 µm.

The gears produced for this research (Fig. 1 and Fig. 2) has the following specific features: z2 = 45; the beginning number of the worm: z1 = 1; the type of the worm: ZE; axial modulus ma = 1,3838mm; the angles of the sides α1 = 10º, α2 = 25º; the axial distance A = 28,575 mm; materials used in the manufacturing: the worm and worm wheel are made from alloy steel 41MoCr11 STAS 791-80, hardened and tempered and then nitrided.
Molybdenum disulfide from the intermediate layers in which it is embedded has a growth pattern that depends on the amount in which MoS2 arrives on the growth surface of the substrate: · at a low MoS2 content amorphous phases were developed; these phases appeared segregated at the grain boundary of the hard nitrides as a tissue phase which percolated the crystalline nitride nanograins; · at a high MoS2 content crystalline phases in a nano-layered structure were developed, where the thickness of nano-layers is 0,68 nm, that is the distance between (002) basal planes of the well ordered MoS2 phase (Fig. 4); these basal planes are oriented parallel with the coating surface and this fact is very important in order to provide a very low friction.

In this study, a porous scaffold of calcium phosphate cement with controlled porosity, pore size and morphology (Fig1) was prepared by using non-water-soluble grains as pore-forming agents [9].
To further expand the application, a number of potential research paths that could result in new types of CPC have arisen and developed in recent years, such as porous CPC, fast-biodegradable CPC, injectable CPC, water-resistant CPC, and rhBMP-2/CPC, etc.

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.