Search results

BP neural network has a three-tier structure, namely the input layer, hidden layer and output layer, its structure is as follows[15]: The establishment and application of combination forecasting model based on rough set The establishment of the RSCM.We collect a large number of assessments object data and expresse as a two-dimensional knowledge representation system after discretization.We deem the various forecasting methods as condition attributes，condition attribute set , Y , the forecast object indicators, as decision attribute that .The predicted value and the predicted data of the object's history of the respective prediction methods of the period t is represented as , thereby On the Domain , this case studyattribute value of the object : ,.
[2] Xiao Zhi, Zheng Daxia,Grain Yield Forecasting combination forecasting method based on rough set [J].

Therefore, to increase the durability of a sophisticated cutting tool, coatings with alloying elements are used [1, 2, 3, 4, 5, 6]; today, silicon, aluminum, rhenium and other elements from a number of metals are used as alloying elements.
To increase the wear resistance of the cutting tool, a new method of hardening was considered - discrete diffusion oxidation having a polycrystalline structure with a grain size of 4 μm.

There are a number of dynamic constitutive models for metals under impact loading that have been obtained from dynamic tension, compression, and torsion tests and used to describe the Von Mises flow stressof metals as a function of the equivalent plastic strain, the equivalent plastic strain rate, and the temperature .
For FCC metal, Z-A model is (12) whereis the microstructural stress intensity, is the grain size, ，，， are material constants.

Zavattieri et al. [2] investigated the dynamic fragmentation of ceramic microstructures, in which the open-up and growing of micro-cracks were assumed along grain boundaries.
Normal force (F) acting on an atom (i) on plane (a) from atoms on plane (b) is ∑== n1j ij ij )120( i r d )r(fF (1) where rij is the distance between atom i on plane (a) and atom j on plane (b); d is normal distance between two planes; n is the number of atoms on plane (b), which is chosen to be 22. f(rij) is force between atom i and atom j, defined from Morse potential [10].

The limited number of data also suggests that a higher fill fraction of semi-solid slurry in the shot sleeve gives slightly better mechanical properties.
The high cooling rate also caused unstable growth of the pre-existing solid particles, which yielded non-globular structure of the semi-solid grains.

After reaction for 6h, a large number of eight-dendritic structures occupied the majority, and the two dendrites of the same edge converged in the middle in some crystals.
The separation of the emitting peaks in Fig. 5 may be attributed to the existence of the crystal imperfections, such as point defects, dislocations, and grain boundaries in the sample of the cuboidal microcrystals.

Fig. 4(a) is the surface photography of the as-grown ZnO film, from which some accumulated shape consisted by a number of 30nm columns can be seen.
The surface of the film becomes flatter after annealing in air at 550 o C for 1 hour, and the well-regulated grain boundary with hexagonal structure of the columns appeared (see Fig. 4(b)).

Currently, various preparation methods of biocomposites of Si-substituted HAp were developed [5-9], and it was found that Si-HAp has a higher bioactivity than HAp, because of its higher triple-junctions grain density, leading to increasing dissolution rate of the implant, thereby speeding up the interface of bone regeneration [10].
Since such biocomposites contain CaO, it is easily hydrolyzed to form a large number of Ca2+, which are attached to the sample surface and the amorphous apatite products by the hydration reaction of Ca4O(PO4)2.

An increasing energy gap from suggested value of InN is related to oxygen incorporate into grain boundary of InN polycrystalline film.
Due to oxygen has higher atomic number than nitrogen thus In-O bond is shorter than In-N bond.

Due to high efficiency of heat extraction and massive number of particles that arrives in the preform, associated to the spray atomisation, low temperature can be maintained during the process and deleterious interfacial reactions can be minimised.
It is usual to obtain a uniform microstructure, with fine grains and with little segregation, contrasting strongly with the coarse structure, segregated and dendritic of the materials conventionally cast.