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The average grain size for the three materials are 5-8µm, 15-20µm and 8-10µm, respectively.
SEM observation of the crater surface has shown that the basic fracture mode was transgranular, consistent with observations by Hooper and Brookes [6], where fractography studies showed that fracture occurs through the primary particles and across the interparticular bridges in a number of aggregates of cubic boron nitride and of diamond.

Table 1 The syntax and semantics of Constructor Syntax Semantics Instance Atomic concept Top concept Bottom concept Atomic concept Concept negation Concept disjunction Concept conjunction Existential quantification Value restriction In addition, DLs have other concept constructors, such as number restrictions , where , and role constructors, such as inverse, transitive closure, complement, intersection, union and composition.
Different constructors support different grain semantics of product information.

The sintered materials were polished successively with water sandpaper numbers 220, 400, 600, 1000, 1200 and 1500, using a polishing machine (Aerotec).
Figure 6c shows that it is not possible to distinguish neither grains nor necks because it was formed a glassy phase, which was confirmed by XRD.

The structure of the superlattice films is represented by [(PZO)1.5h /(PTO)1h]3 , where 3 is the number of (PZO)1.5h/(PTO)1h layers.
These have proved that the composite film has the intact crystalline morphology, even the grain boundary can not be detected in the range of SEM image.

In this paper, the directional solidification of technical preparation of the solar grade polysilicon is the use of the segregation effect of impurity elements in solid and liquid phases to achieve the purpose of purification, at the same time by one-way heat flow control neatly arranged along the growth direction of columnar grain structure.
Vacuum high-temperature volatile makes P a large number of exclude in Si evaporation losses.

Computer vision technology is widely applicated in intelligent detection, such as Category and figure of grain identification, crops recognition in the field, grading of fruit and vegetable.
Acknowledgment This study is supported by the Doctoral Startup Project of Liaoning Province Science and Technology Plan and Liaoning Province Department of Education General Scientific and Technological Research Projects, the project numbers are 20121098 and L2012193 respectively, I would like to express my sincere gratitude here.

This method has a number of potential advantages [12]: (i) a high homogeneity of reactants can be achieved, (ii) the required composition for the ceramic formation can be adjusted by solution processes, and (iii) the precursor can undergo low-temperature decomposition, enabling ceramic formation under milder conditions than those used in conventional techniques.
Furthermore, the diffraction peaks of carbides become narrower, indicating the growth of the grain size.

The mean grain size was about 10 µm.
Results and discussion Fig. 3 shows the S-�f curves (�f: number of cycles to failure) in all of environments tested under ultrasonic and rotating bending.

Introduction For the last decades there are a number of research teams who have been trying to develop biocompatible materials with unique properties for applications in a variety of biomaterial fields.
Co-precipitation and sol-gel method are generally preferred because they offer several advantages including the control of crystallinity, grain/crystal size, shape, morphology, stoichiometry, and interfacial properties to achieve good homogeneity [5], what is very important for ceramic materials designed to be utilized in orthopedic and dental applications.

One of the most salient microstructural characteristics is that there are lots of plate-like Ti3AlC2 grains consisted of a number of thin slices.