Search results

With the further increase of deformation degree, the quantity of twin crystal increase and the austenitic grains are refined.
With the increase of deformation, a large number of deformation twins appear.

Results and Discussion Micro-structure Figure 1 showed the precursor NH4FePO4·H2O and SEM photograph of synthetic samples A and B, as shown, precursor took the shape of a ball shape comparison rules (a), the LiFePO4/C sample (b) base was the size of spherical and granular good agreement, with an average diameter of 1μm, pure phase LiFePO4 samples(c) rules of poor appearance, and consistency of the larger particles was not good, there was aggregation.Compared with other studies, the size of synthesized material granularity was small in this experiment, carbon can well wrapped in LiFePO4 surface , and inhibited during the sintering process LiFePO4 grain growth, and it could be relatively small particle size and more uniform distribution of LiFePO4/C materials.
Electrochemical properties Figure 4 showed the experimental samples A and B at room temperature to 0.2C charge and discharge rate performance curve for the first time.It can be seen, both LiFePO4 material had better charge and discharge platform, charging platform was about 3.5V, discharge plateau was about 3.4V , the initial discharge capacity of pure LiFePO4 were 116.2mAh/g, 108.2mAh/g, LiFePO4/C ratio of the first charge and discharge capacity were 151.9mAh/g, 144.6mAh/g, the first charge-discharge efficiency were 93.1%, 95.2%.Sample A under different rate discharge capacity with cycle number of changes shown in Figure 5.Given: 0.2C discharge at 20 cycles, the discharge capacity of 134.7mAh/g, decreased 9.5mAh/g; 10C discharge rate, the loop 20 times, the discharge capacity decreased by about 12mAh/g, a 8.76% capacity fade.

Since then, machine capacities and the number of applications for radial forging have continued to increase.
When the capability of forging equipment is fixed, and the width of the flat anvil with the blank thickness ratio of 0.5, FPE can be satisfied; both the ratio is less than 0.5, the central coarse grains are not often fully broken, and because of the large metal surface layer deformation, the small inner deformation, it is easy to cause tensile stress in the center, in severe cases it can cause blank internal cracks and defects such as depression to be happened.

FKM which was cut into grains with weight of 3.0g were poured into 30mL reaction solution and stirred by a magnetic churn-dasher at 70℃.
Quite a number of the particles were quadrate shaped and parts of the particles were irregular shaped.

On the other hand, with the increase of nano-TiO2 content in the plating solution, the number of the crystal nuclei in the composite coating increased and the grains were refined.

Up to now, a large number of reports on different methods to get the growth of ZnO thin film on a variety of subtrates [1～14].
The average particle size is given, β is the diffraction peak half-width (FWHM), θ is Bragg diffraction angle, and d is the average grain size.

It is suggested that the grid takes a reasonably coarse-grain scale so that the mapping would not result in too many fine data points.
The number of clusters could be decided by estimating the probability density contours for the two-component mixture distribution.

Cement with 28d compressive strength over 65MPa, corase-medium natural sand with finess modulus larger than 3.0, continuous series crushed limestone in maximum grain size of 20mm, I-class fly ash and high-performance water reducer were used for mixing concrete in strength grade of C80.
The formulas for evaluating concrete quality are shown as follows [7], (1) (2) Where n is the number of tested concrete strength in same group for statistics; Rn is the mean of tested concrete strength; Sn is the mean-square deviation of tested concrete strength; Rk is the strength grade of tested concrete; Rmin is the minimum value of tested concrete strength; k1, k2 are the coefficients of qualified judgement, they are taken as 1.6 and 0.85 according to the standard.

Recently, a great number of novel semiconductor photocatalysts have been carried out to enhance the photocatalytic efficiency under UV-light by some simple methods.
With further increasing temperature to 500˚C, XRD patterns of the prepared samples showed sharper,which indicated a better crystallinity and increase in grain size.

Thus, given a set of light-paths that need to be established on the network, and given a constraint on the number of wavelengths, we need to determine the routes over which these light-paths should be set up and also determine the wavelength that should be assigned to these light-paths [4].
The challenge now is to combine the advantages of the relatively coarse grained WDM techniques with emerging all-optical switching capabilities to yield a high-throughput optical platform directly underpinning next generation data networks.