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But the number of connection dropout accident didn’t declined obviously.
Strengthen thread joint’s connection strength by improving casing’s material quality always is the study focus in the past years, but the number of connection dropout accident didn’t declined obviously.
The casing’s microstructure is pearlite and ferrite and local coarse pearlite microstructure, the grain size is grade 6.0 and the non-metallic inclusions of material are A0.5, B1.0, C2.0, D0.5.
The coupling’s microstructure is pearlite and ferrite, the grain size is grade 5.0 and the non-metallic inclusions of material are A0.5, B0.5, D0.5.
The simple numbered 1# was made up according to optimum torque, the simple numbered 2# was made up according to minimum torque, the simple numbered 3# was made up according to location on which three-point five thread exceed the coupling field end side.

On the surface of cracks, grain boundaries were embrittled by corrosion, and grains were clearly observed.
McEvily et al. [1] reviewed a number of case studies involving HAC in steel.
Van Leeuwen [3] developed equations describing the diffusion to and the subsequent precipitation of hydrogen into lenticular voids resulting from the stress-induced decohesion of grain boundary precipitates.
In the crack propagation portion, the grain boundaries were embrittled by corrosion, and grains were clearly observed.
Van Leeuwen, “ A quantitative model of hydrogen induced grain boundary cracking“, Corrosion 29 (1973) 197–204

The defects, such as Zn or O vacancies, grain boundaries, are considered to be the main factors causing this situation.
For the mechanism of broad band luminescence,  it’s generally thought to have originated from the recombination of electron hole pairs, corresponding to various  defect states of nanoparticles surface, particularly, a large number of oxygen vacancies in the particles surface [11-12].
Light scattering is generally affected by impurities, Zn or O vacancies, grain boundaries and surface roughness.
The defects, such as Zn or O vacancies, grain boundaries, are considered to be the main factors causing this situation [14].
The defects, such as Zn or O vacancies, grain boundaries, are considered to be the main factors causing this situation.

Results show that the hydrostatic stresses on alumina grains vary continuously, indicating the absence of discontinuities in thermal residual stresses along the compositionally graded layer and at the interfaces of the homogeneous layers.
The dependence between the hydrostatic stress, σh, 'seen' by the analyzed alumina grains with the spectral shift in the ruby luminescence R-line compared to the stress-free position, ∆λ, was first established by He and Clarke in polycrystalline alumina [6].
Journal Title and Volume Number (to be inserted by the publisher) 3 Raman.
SEM micrographs of polished and thermally etched surfaces of alumina (left) and alumina-zirconia (center) homogeneous layers, showing the grain sizes and the distribution of both phases in the composite layer, and of the polished cross-section (right), showing the intermediate graded layer (<100 µm) between alumina and alumina-zirconia layers.
The hydrostatic stresses on alumina grains vary gradually according to the continuous variation of composition in the compositionally graded layer.

Management can also assign numbers for its unified. 
Main types of food include grain, oil, animal products, fruits, vegetables, soft drinks and fermented products.
In order to meet the needs of reducing two-dimensional information capacity, it regulates that the number contains 30 digits, the first two stands for the Food Category.
Number"01000000000 1000000000000000001 "can represent grain and oil, edible oil, as shown in Fig.2, the first two" 01 "represent grain and oil, the middle 10 "0000000001 "represent edible oil, last 18" 000000000000000001" represent the grain and oil production of edible oil.
Fig.2 Food number schematic design Single Food Barcode Generator.

The bond-fluctuation model (BFM) is a very efficient coarse-grained lattice model for polymers.
One takes a certain number of chemical monomers adjacent to each other along the chain and lumps them together into one "effective bead", which is then put in the centre of gravity along the parent chain [8], the result is a set of effective beads distributed in space, which can then be connected by coarse grained bond vectors.
The properties of kuhnian chain depend upon the number of chemical monomers in the effective beads [9, 10] and they all have in common the fact that the coarse grained bond vectors and bond angles are flexible.
All these numbers refer to a choice of units where 'time' t is measured in attempted moves per monomer.
It is based on the number n )(ε of bonds that are not in the ground states.

Table 2 listed the main welding parameters and forming, From the table, with the increase of laser power, the number and size of stomata are increasing trend.
This is because the laser power is greater, the weld penetration depth is greater, gas pool in the metal is not easy to overflow, resulting in an increase in the number of stomata.
The increase of laser power is very easy to make the weld penetration, but the probability of pores increases process numbers for 11 samples can not only ensure the good appearance of weld, and after inspection after no obvious pores.
Fig.1 Laser - aluminum alloy 6005A-T5 with X ray photographs of arc welding joint Joint microstructure 6005A-T5 aluminum alloy is aluminum alloy heat treatment reinforcement, the main strengthening phase is Mg2Si, the substrate for completely recrystallized microstructure, residual two crystal compounds are broken and aligned along the extrusion direction along the direction of deformation, grain elongation, crystal containing small sub grain structure, as shown in Figure 2 (a) shows.
Fig.3 The back bending cracking of 6005A aluminum alloy specimens of laser - arc hybrid welding head 4.3 Impact toughness Laser on aluminum alloy 6005A process number 11 arc hybrid welding joints do the impact test.

The initial microstructure of the 1.4307 consists of mostly equiaxial austenite grains.
The average grain size resulting from the EBSD is 13.8 µm, however, it is underestimated due to the presence of smaller grains with irregular, deformed boundaries.
Material has a band structure with a bimodal grain size distribution with an average grain size of 7.35 µm.
The ferrite strands, on the other hand, often consist of single, highly elongated grains with an extensive sub-grain structure including a low angle grain boundaries.
The initial microstructure of austenite grains contains a number of twin boundaries, but they do not grow during deformation.

The results shown that a large number of cordierite generated at 1300 oC.
Table 1 The composition table of cordierite formula Serial number A 1 A 2 A 3 A 4 A 5 Quartz sand Industrial alumina Magnesite 53.41 21.66 24.93 49.06 26.01 24.93 44.71 30.36 24.93 40.36 34.71 24.93 36.01 39.06 24.93 A3 formula was the theoretical content of cordierite formula Table 2 The flexural strength of samples A1 A2 A3 A4 A5 1300°C 13.1 16.5 16.5 17.8 22.6 1350°C 17.2 21.8 21.8 19.7 1400°C 17.6 17.0 13.2 (a) (b) (c) Fig.1.
The grain was in good condition, with the stick form, and the grain size was about 2 μm.

Evolution of mean crystallite size (left y-axis) and volume fraction of the grain boundaries (right y-axis) as a function of Si content.
Turning to the analysis of the volume fraction of the grain boundaries, fgb, it shows an opposite trend to that of (see Fig. 5, right y-axis); the addition of silicon provokes the increase of the volume fraction occupied by the grain boundaries (from about 10% to 27% for x=0 and x=20 respectively, see table 1), which is a direct consequence of the grain refinement.
Moreover, a higher volume fraction occupied by the grain boundaries could also cause a larger lattice strain. 3.3.
Note that these configurations were deduced by the application of the local environment model [32-36] after the fit of the spectra, in which the magnetic moment of an element depends on the number of nearest neighbors (NN) (see ref [8] for more details).
The authors explained these findings by the fact that the structural disorder in binary Fe-Al alloys reinforces the ferromagnetic exchange due to the larger effective number of magnetic NN in the disordered phase compared with the ordered one.