Search results

The grain showed an elongated dendritic morphology and aligned along the build direction during laser beam sintering.
Thus, the microstructure involving the grain morphology and crystallographic texture formation was anisotropically controlled by laser beam sintering technique.
A short implant life is a severe problem, especially for the growing number of younger patients who are required to use hip implants, because of their prolonged remaining life and active lifestyle.
The grain showed an elongated dendritic morphology and aligned along the build direction during LBS.
The grain morphology as well as crystallographic texture formed responsible for the unidirectional heat flow along the build direction.

This phenomenological diffusion problem is treated by overlaying it with a fine-grained lattice that was addressed using a Lattice Monte Carlo method and a little-known exact expression for the lattice-based effective diffusivity in the presence of random traps.
The Model In keeping with the spirit of the LMC method [2] a fine-grained lattice is constructed to overlay the phenomenological diffusion problem.
Results and Discussion The expression Eq. 4 for the effective diffusivity was first verified by making use of the EinsteinSmoluchowski Equation: Deff = / 4t (5) where R is the displacement of a given particle in time t and the Dirac brackets < > indicates an average over a large number of particles.
Eq. 5 is readily realized in an equilibrium simulation wherein completely non-interacting particles are permitted to diffuse in a lattice containing random traps for a fixed number of jump attempts per particle (proportional to time) [2].
Gust, Fundamentals of Grain and Interphase Boundary Diffusion, Wiley, Chichester, 1995

It is noted that in the process of applying the polymer shell to the surface of the abrasive grain in the fluidized bed, the effect of slippage and the absence of the influence of the installation wall on the value of the longitudinal velocity of particles near it is observed, which allows to increase the productivity of creating an abrasive-polymer compound.
Introduction In the technology of waterjet cutting, the tool is a supersonic jet of liquid with abrasive grains [1, 2].
Main Part The productivity of applying the polymer shell to the surface of the abrasive grain in the fluidized bed is estimated as the mass of the processed material per hour of operation of the installation.
It is largely random, particles collide with each other, collisions (with rare exceptions) can be considered elastic, the number of particles per volume unit does not change over time.
, (3) where t is the time; is the radius-vector of a material point simulating a moving particle at time t; , is its speed and acceleration at this moment; is the Hamilton differential operator by argument , - by argument ; is the six-dimensional elementary volume of the phase space centered at the point where the material point falls with probability at time t (n is the number of particles per volume unit); J is the collision term of the equation; is the density function of the distribution of particles according to their positions in the geometric space and the velocity space at different moments of time; is convolution-scalar multiplication sign.

With the load increasing at the same time, the number of samples is also increased damage elements.
As the number of times the value of simulation is to rock as a homogeneous material.
The number of times the value of simulation in line with the second failure mode, and the paper [5] has the same conclusion, that the model is reasonable.
The reason is: non-uniform materials, the stress distribution will appear uneven nature is reflected in the actual rocks and defects due to the random distribution of grain, when subject to external load.
These reflect the actual rock because of the grain and the defects of the random distribution.

More than 50% of total heterotrophic numbers were anaerobic heterotrophic bacteria producing spores.
BF, D_2MT, and AF were the soil collection before the seedling sowing, during 2 month cultivation, and after rice grain and leave harvesting, respectively.
BF, D_2MT, and AF were the soil collection before the seedling sowing, during 2 month cultivation, and after rice grain and leave harvesting, respectively.
BF, D_2MT, and AF were the soil collection before the seedling sowing, during 2 month cultivation, and after rice grain and leave harvesting, respectively.
The numbers of bacterial community presented in the soil surface (0-10 cm), an oxic zone, were comparable to those in the subsurface (10-30 cm), an anoxic zone, as shown in Fig.3.

Introduction In recent years, quite a number of researches have dealt with solid state transformations in the presence of an external electric field.
The average grain sizes of the above treated specimens were measured with an image analyzer.
More than 500 grains were measured.
Both results on mean grain size and microhardness indicate that the recrystallization progress is also postponed by the application of the electric field, as recrystallization involves the grain growth and the softening of the material. 300 400 500 10 12 14 16 18 Mean grain size(µµµµm) Annealing temp.( o C) E=0 E=4KV/cm Fig. 3 Mean grain size variation with the annealing temperature Fig. 4 Variation of microhardness with the annealing temperature Fig. 5 and 6 displays the constant ψ ODF sections of samples annealed at 300, 400 and 500ºC for 90min without and with the electric field.
In this way, the polygonization process, the nucleation of distortion free grains and their growth are slowed down.

At 1073K, small grains in the size of 50-100 nm are observed on the fiber surface.
At 1273K, relatively large grains in the size of 1-2 µm exits with the dominant small grains.
The number of the large grain is, however, small.
From the consistency among the SEM images and the XRD patterns, it is supposed that the observed small grains are assigned to anatase and the large grains are assigned to rutile.
The nano grains observed on the fiber surface are assigned to anatase, while the relatively large micro grains observed on the fiber are assigned to rutile.

There have been a number of studies about Mg-Al alloys.
The eutectic structure distributed in grain boundary and between the dendritic.
The value of k reflects the sensitivity of the yield strength to the grain size.
The cleavage facet of as-cast AZ40M alloy is smaller than that of the homogenized alloy, and there are a large number of dimples in where the cracked second phase can be seen.
Qian, The Effect of Manganese on the Grain Size of Commercial AZ31 Alloy.

These carbonandos are relatively porous masses of fine-grained interlocking micrometer-sized diamond grains that have hardness that exceeds that of diamond single-crystals.
Stress values determined at a number of locations on the sample surfaces are summarized in Table 1.
This needs to be viewed in relation to the large grain statistic contribution.
Most likely these can be attributed to statistical uncertainties other than neutron counting or grain statistics.
Acknowledgements The authors acknowledge support from Necsa Ltd., the use of their SEM and XRD laboratories, as well as ANSTO for the beam time awarded on the KOWARI instrument under proposal number 2705.

The substitution of Pr for La results in a notable grain refinement of the as-cast alloys without altering the phase structure of the alloys.
It displays that the substitution of Pr for La results in the visible refinement of the grains of the as-cast alloys.
The activation capability was indicated by the number of charging-discharging cycles required for attaining the greatest discharge capacity through a charging-discharging cycle at 100 mA/g current density.
The enhanced discharge capacity by melt spinning is ascribed to the refinement of the grain produced by melt spinning because the grain boundary exhibits the distribution of the maximum hydrogen concentrations.
The substitution of Pr for La results in the obvious refinement of the grains of the alloys instead of changing the phase compositions of the alloys.