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The design principle of chromium alloy tube is that: alloys can form and preserve the protective oxide layer which is formed by dense Fe-Cr spinel and the complete Cr2O3 rich chromium layer in the Fe-Cr spinel grain , under the conditions of the design temperature of tube and the inside and outside diffusion of alloy elements, thus the tube can achieve good anticorrosion performance.
The inner layer of this oxide layer was formed by dense Fe-Cr spinel and the complete Cr2O3 rich chromium layer in the Fe-Cr spinel grain.
These large number of oxygen atoms will satisfy the needs of the reaction of oxygen oxidation.
There were a large number of gaps and microcracks in the middle layer.
The investigation on countermeasures against massive exfoliation of oxidation scale formed on the internal surface of the coarse grained 18-8 type S.S boiler tubes [J].

Actually, despite of a very large number of papers published on this specific subject, only few authors investigated ZnO 3D hierarchical structures in comparison with two-dimensional ones.
The same situation is offered by the bisphenoids which z axis is about 10 µm and the fine structure is constituted by nanoparticles only slightly lower than those of the NS powders, while NF sample showed grains about 30 nm in size in a flower structure which diameter is about 1 µm.
In particular, in most films, the SEM analysis highlighted only a very modest coalescence of the grains except the case of NF films, for which an appreciable grain growth occurred.
It is no easy to understand such differences due to possible variations in the thickness of the samples, but also to a lower number of contacts between the particles in the bidimensional structures, with a consequent lower number of percolation paths.

Due to the evacuated space between MH grains, a sharp pressure decrease occurs after the opening of the valve, which due to rapid pressure changes is only shown with a dashed line in the diagram.
The model consists of seven cylindrical domains representing MH, which are located in the same number of cylindrical steel containers.
Due to a slow rate and low Reynolds number, the character of the cooling water flow is laminar.
Thermal conductivity of the powdered metal hydride depends on grain size, which changes during operation due to cracking of individual grains in the absorption desorption process.
Department of Energy (DOE) established a number of parameters that represent technological objectives for efficient use of mobile hydrogen storage tanks achieved in 2020.

The ratio of the thickness of the layers [1], the pressure in the deformation zone [2], the preparation of the surfaces [1, 3] and a number of other technological factors affect the value of the required deformation of the grasping during cladding.
In addition to the high adhesion strength of the layers, a number of requirements are imposed on the bimetallic strips of brass-steel-brass in terms of dimensional accuracy, mechanical properties and microstructure [16].
The relative reduction during cladding affects the bonding strength of bimetal layers, the nature of the microstructure, the size of the recrystallized grains, the mechanical properties of the strip, the dimensional accuracy [4].
Large values ​​of the joint degree of deformation lead to excessive grinding of grains after the recrystallization process and an increase in the anisotropy of the mechanical properties of the material, while smaller values ​​contribute to an excessive growth of the ferrite grain during annealing and deterioration of the surface after stamping [5].
The roughness parameters were the average arithmetic deviation of the profile Ra, the number of protrusions n, the relative reference length of the profile tp, the maximum deviation of the profile Rmax.

The root dry weight, main root length, lateral root number, total length, lateral root number, root dry weight of the maximum was respectively increased by 80.85%, 100%, 33.86%, 167.74%, 26.31% and 80.41% than control in early mature stage.
So the management for acidic soil has great significance to stable the development of grain production and to ensure the national food safety.
Fig. 1-2 Effect of biochar on the main root length Effect of biochar on the number of lateral roots As shown in Figure 1-3.It represented the application of biochar influenced the numbers of lateral roots.
Biochar can increase root nodules number and dry weight of root nodules markedly in mature early period (R7).when the content of biochar for 10t hm-2, it achieved the maximum numbers of root nodule.
Science 320:629 [15] Asai H, Samson BK, Stephan HM, Songyikhangsuthor K,Inoue Y, Shiraiwa T, Horie T (2009) Biochar amendment techniques for upland rice production in Northern Laos: soil physical properties, leaf SPAD and grain yield.

Table 1 Basic properties of the red clay natural water content ω[%] Natural density γ[g·cm-3] proportion △s liquid limit WL[%] plastic limit WP[%] plastic index IP[%] free swelling ratio Fs[%] 24.81 1.92 2.76 57.86 24.27 33.59 60 Table 2 Granule composition of red clay less than a particular size (mm) of the soil mass percentage [%] <10 <5 <2 <1 <0.5 <0.25 <0.075 <0.05 <0.01 <0.005 <0.002 100 100 99.78 99.69 99.46 99.32 98.72 89.08 58.94 47.25 42.92 Curing materials Ionic Soil Stabilizer (commonly known as "solid roadbed," "solid Lubao”), is a kind of mixed liquid that contains a number of strong ionic compounds, and it is brown-black water-soluble liquid.
Fig.1 the shear strength of red clay stood and ISS solidified soil Table 4 Shear test results Soil sample number Cohesion C(kPa) Internal friction angleφ（º） stood 80.51 14.1 ISS solidified soil 89.52 13.58 According to the test results of table 4, the cohesions increase from 80.51 kPa to 89.52 kPa separately, and its growth rate is 11.19%, but angle of internal friction is almost invariable.
The adsorbed original cohesion and solid cohesion of soil grain makes the thickness of the diffuse layer thin.
Adding ISS, the arrangement of clay mineral grain inclines face to face.
Reinforcement mechanism of ISS ISS is a sulfonated oil resin, and it is a combination of a number of strong ionic compounds.

Fig.2 Effect of dispersant on the degradation efficiency of X-3B This experiment added ethylene glycol to form a protective layer of the grain surface and hinder the grain close[11].
The increased degradation is likely due to the increase of the total surface area (or number of active sites) of the photocatalysts available for photocatalytic reaction when increasing the dosage of Ethylene glycol monomethyl ether.
Although there are a number of studies which examine the effect of deposition parameters on the microstructures of TiO2/AC films[15], the morphology properties of TiO2/AC films have not been elucidated in relation to the deposition parameters pH values .
The increased degradation is likely due to the increase of the total surface area (or number of active sites) of the photocatalysts available for photocatalytic reaction when increasing the dosage of titanium sulfate.

The XRD peak broadening consists of contributions from crystallite size broadening and the strain broadening, and the relationship among the full width at half maximum (FWHM) of the Cu diffraction peaks (β), average diameter of grain (D), and microstrain (ε) can be well described by the Eq. 2 according to Hall-Williamson’s method [5, 15].
After aging for 2 h, a large number of uniformly dispersed nano-precipitates have precipitated from the matrix.
As can be seen from Fig. 4, a large number of dispersed nano-precipitates distributed in Cu0.24Cr0.20Sn alloy.
A large number of dispersed precipitates separated out from the matrix during pre-aging.
Lu, Mechanical properties and rolling behaviors of nano-grained copper with embedded nano-twin bundles, Acta Mater. 56(11) (2008) 2429-2440.

Large numbers of surface defects are formed in Fig.4 (c).
The propagating dislocation loops may merged into the grain boundary and induced the lateral grain boundary migration or bounce back from rigid boundary which will be discussed in our future work.
From Fig.7 (a), it can be observed that the disordered atom number increases immediately after each slip occurrence and then decreases in the dissipation process(marked with circle).
(a) (b) Figure 7 Plots at depth of 0.9nm (a) indenter displacement and number of disordered atoms as a function of scratch time (b) Tangential force and internal energy as a function of scratch distance 4.

In all the above cases, BaZrO3 powder has been synthesized through the conventional solid state method which involves prolonged calcinations at high temperatures with intermediate grindings, yielding large coarse grained micron sized powders [14-16].
Investigation of the molecular structure of the (Ba1-xSrxZr)O3 ceramic powders was carried out by fourier transform infrared spectroscopy (FTIR) using an AVATAR-320N spectrophotometer in the wave number range 400-3000 cm-1 at room temperature.
They were indexed on the basis of a cubic structure matched with ICSD file number 74-1299.
The peaks near 860–869 cm-1 may be assigned to the metal oxide bond between strontium and oxygen and the peaks shifted slightly to higher wave number side with increase in the Sr content.
The average particle size and the average grain size increased with the increasing of calcination and sintering temperatures.