Search results

Furthermore, the preferred orientation of the atomic planes was determined by texture coefficient (TC) [18]: (8) where Ihkl is the measured integrated intensity, Io,hkl is the relative integrated intensity from the JCPDS card, and n is the number of diffraction peaks.
The grain growth of ZnO can occur at 900 oC or higher [21] and the annealing could reduce the strain in ZnO particles [22].
Therefore, the increasing of crystallite size was from the grain growth and the decreasing of strain was from the annealing effect.

Materials and Methods In order to compare the role of the filler in the cellular concrete structure formation, an experiment, in which finely ground quartz sand, fly ash from Novocherkassk regional power station, expanded clay dust and soft chalk from the Lysogorsk deposit crushed to a maximum grain size of 2.5 mm,was carried out.
When conducting research with soft chalk, it was revealed that vigorous mixing of chalk slip in a turbulent mixer leads to additional and very significant dispersion of chalk particles, and this allows, when preparing a carbonate filler, to limit the results only to fine crushing of the rock to grains no more than 2.5 mm.
The kinetics of the collapse of the cavity and its subsequent division into a huge number of small bubbles are determined by the type of aggregate, the mixing mode and rheological characteristics of the slip [5, 7].

For example, for the alloy Al-6 % Zn- 3 % Mg, plastic behavior patterns which have been studied in depth and comprehensive [1-4], it is characteristic the presence of grain boundaries and subgrains, the presence of particles of different sizes, high initial dislocation density.
It may be noted that in accordance with experimental data , for such e mean free path of the dislocations in the shear zones on the order is less than the size of the subgrains , thereby sliding in the alloy develops as a material which has no grain and subgrain boundaries; i.e. as in a single crystal.
Moreover, for a number of precipitate-hardened materials is known experimental evidence of the formation of point defects in the deformation process and their impact on the characteristics of the dispersed phase [17, 18].

It was shown that, with the sintering temperature of 1000 oC and the amount of PEG-400 of 1.5 wt % , the size of primary crystal grain was about 48 nm.
Then it creates hydrogen-based between a large number of ether bonds (-O-) and -OH which coats on the particle surface.

Once this condition removed, the number of necessary thrusters reduces to only six, as depicted in the drawing.
It does not necessary mean that the overall consumption obeys the same ratio, as far as the number of impulses for accomplishing the control may be in the reversed ratio.
Geometrically speaking, the misalignment of the braking SRM, including the solid, tubular propellant grain, is well below one tenth of a millimeter, the actual cause persisting in the nonsymmetrical burn of the propellant grain.
Cacoveanu, „First flight experiment with the NERVA-1 inertial platform”, Proceedings of 2010 International Conference on Mechanical Engineering, Robotics and Aerospace ICMERA-2010, ISBN 978-1-4244-8867-4, IEEE Catalog Number CFP1057L-PRT, December 2-4, Bucharest, Romania, 2010, pp. 312-316
Number IAF-97-A.7.10. 48th International Astronautical Congress, Turin (Italy), October 1997

Castro [11] concluded that the structure and formation of new phases is highly dependent on nucleation and growth conditions, grain boundaries, localized impurities or any general kind of surface imperfections.
Scanning electron microscopy images show a number of needles arising at the carbon phase, with a visible interfacial boundary (Fig. 4).
The structure of Al/C/TiC samples exhibits a number of precipitation needles, similar to that of Al/C samples (Fig. 7).
A further course of the reaction between the matrix and the reinforcement revealed an arrangement of a number of Al4C3 crystals.
Moreover, the morphology of the phase components depends on the number of nuclei formed in the previous processes.

The number of cells per milliliter in this suspension was then counted using a cell counter.
The numbers of colonies were counted manually as shown in Fig. 3.
Considering the radiation with high dosage (above 4 Gy) alone could kill most cells, the initially plated cell number was varied with the radiation dose.
The same number of cells were plated for each control group.
Such greater enhancement effects can be attributed to the unique microstructures of HAuNPs, a polycrystalline sub-20nm Au shell with 5 nm grains, leading to a higher catalytic activity of Au on radiolysis of water and biomolecules whose products could damage the DNAs inside cells.

Table 1 Mechanical parameters for the model Elastic modulus Compressive strength Poisson ratio Weibull parameters Mean value [MPa] Homogeneity index Mean value [MPa] Homogeneity index Mean value Homogeneity index glass 73000 7 800 7 0.22 100 Table 2 The numbers of failed elements in the model failure process λ =0.0 λ =-1.0 λ =1.0 Step Number of failed elements Cummulated number of failed elements Step Number of failed elements Cummulated number of failed elements Step Number of failed elements Cummulated number of failed elements 50 0 0 69 0 0 78 0 0 51 1 1 70 1 1 79 1 1 52 0 1 71 0 1 80 0 1 53 0 1 72 0 1 81 0 1 54 1 2 73 1 2 82 1 2 55 0 2 74 0 2 83 0 2 56 0 2 75 1 3 84 1 3 57 0 2 76 0 3 85 0 3 58 0 2 77 1 4 86 0 3 59 1 3 78 1 5 87 1 4 60 0 3 79 2 7 88 0 4 61 2 5 80 1 8 89 0 4 62 0 5 81 4 12 90 2 6 63 2 7 82 2 14 91 1 7 64 0 7 83 3 17 92 1 8 65 2 9 84 4 21
For the three models in this paper, the numbers of the failed elements are shown in Table 2.
Table 2 shows that, the crack growth rate will change from the state of subcritical crack growth to the state of unstable growth when the total number of failed elements reaches a certain value (see the bold numbers in Table 2).
Thus, the critical stress intensity can be determined by the change of the numbers of acoustic emission.
For instance, the plastic areas of the crack tip, the crack-bridge and pulling out of grains may improve resistance [22].

The research of all kinds of factors is put up on the inner coking of coal in the plasma reactor during the processing of pyrolysis of coal to acetylene, includ cooking phenomenon, coal of property, coal of grain degree, enter anticipate a speed , power and equip structure.
In the reactor the complex radical pyrolysis reactions happen and the creating pyrolysis gases have much acetylene and carbon monoxide, a small number of methane and ethylene, trace amounts of carbon dioxide.
There is also observed a large number of carbon black on the coking material upper when the channel blockage caused by device coking, rarely carbon black material on the coking material upper when no reaction channel blocked.
Because the coal particals interior of larger particle size in plasma centre reaction zone is short of the pyrolysis reaction temperature for the heat transfer rate, and then left, which forms a large number of coal pyrolysis residue.

A small amount of Ni about 0.1 ~ 1% which is effective to refine the grain size and graphite size.
As we can see from the Table.1, the number of graphite nodules don’t change greatly, the average diameter increases by about 30% and the total area of graphite increases by 53% when joining the Ni-38%wt Si alloys.
The number of graphite nodules is controlled by nucleation rate.
Compared to the number of graphite nodules, Ni-Si alloys has the ability to promote the graphite nucleation, but its effect is slightly worse than that of 75 ferrosilicon.
Fig. 6 Sampling sketch and number of wedge casting.