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A number of laboratory studies have indicated that Ni-based alloy have significant potential in wear critical applications[8-10].
The difference between the hardness of the two alloys could be due to the fact that hard phases and smaller grains of the alloy with the addition of rare earth.

Such behaviour for the conductivity of samples in the high field region (10MV/m) is tentatively explained in terms of a set of barriers to the conductivity at the grain boundaries of the ceramic particles, in accordance with a Schottky barrier type conductivity: � � � � � �
 � KT exp
 where 
 are related with the number and the hight of the barriers.

Introduction Porous ceramic materials offer a number of useful properties including low density, high-temperature stability, permeability, high surface area, and thermal shock resistance [1-3].
When the sintering temperature is lower, the calcium ions can escape from the zirconia lattice and enter the boundary of zirconia grains, these ions can re-diffuse into zirconia lattice when more elevating sintering temperature.

However, the grain size decreased noticeably with the incorporation of silicate into the apatite structure (Fig. 3).
The first result was an increase of the number of cells on all the tested materials with the culture time from 3 to 7 days.

Combination of magnetic and elastic properties leads to a number of striking phenomena that are exhibited in response to impressed magnetic field.
Zhdanov1, G Morfill1, Levitation and agglomeration of magnetic grains in a complex (dusty) plasma with magnetic field.

The main reason why to make them exist is that, vacancies and oxygen atoms cannot sufficiently diffuse for lack of necessary driving force so that oxygen clusters cannot smoothly form and grow at lower temperature without a enough number of vacancies and oxygen atoms, (2) When temperature is 923K or 1073K, both amount and mean sizes of the oxygen clusters gained from the simulations are relatively reasonable.
Though temperature is over high, the strong diffusion only prompts the oxygen clusters formed preferentially to absorb more vacancy and oxygen atoms and to swallow the smaller oxygen clusters around them, like as “Ostward phenomenon” in grain growth, so that the amount of oxygen clusters decreases and their mean size increase, Conclusion A phase-field simulation is presented to study the effect of annealing temperature on oxygen clusters’ evolution in silicon wafer during low temperature annealing.

In this area it firstly arises to the slips in the surrounding grains by influence of tensile stress activity.
If the number of impurities in certain area is bigger, it considerably decreases the cross-section of experimental sample, which transfers force, by which the tensile stress increases in certain area, which causes localization of plastic deformation in certain area.

With the number and size of the pores increased, the bending strength of ceramic cores will decrease.
Mullite fiber during 1540℃ high temperature strength test showed a certain amount of shrinkage, which was due to fiber internal grain grew up obviously, shown as Fig.5.

Then planting basket and ceramic grains were designed for fixed plant roots.
the shell features comparison of three generation Crystal Eco-brick Crystal Eco-brick Physical parameters Crystal Eco-Brick (The first) Crystal Eco-Brick (The second) Crystal Eco-Brick (The third) Open direction of the matrix Side Open Sliding Sliding Door opening direction Side of the sliding Side of the sliding Push the top Planting baskets fixed effects Loosen Loosen Fixed good Vents size Φ=3mm Φ=18mm Φ=20mm Ventilation number of holes 48 12 16 Ventilation hole location Left, right, top Left, right, top, behind Right, before, behind Housing material Polycarbonate Glass Acrylic Sheet Translucent material Poor good good Material resistance to stress Easy to crack Frangible good Table III.

This effect is due to the introduction of a large number of defects and strain by de MA process, which is related to the fracture and welding abovementioned.
Yamauchi, New Fe-based soft magnetic alloys composed of ultrafine grain structure, Journal of Applied Physics, 64 (1988) 6044