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Its basic function is to separate cells, short stems and other miscellaneous materials from grain when they come from the preliminary cleaning system.
(1) Where, η is the perforation rate, r is the radius of hole, W is the width of two adjacent holes, L is the length of two adjacent holes, n is the number of holes.
Acknowlegments This work was financially supported by the Supporting Plan Project for Youth Scholar Backbone of General Universities of Heilongjiang Province(1251G011), Science Start-up Supporting Project for Doctor to Settle Heilongjiang Province(LBH-Q10147) References [1] Jiang Enchen: A Stripping Unit and Pneumatic Conveying System for Grain Harvesting.

As shown by many researchers, the grain size of WC in the sintered alloys has strong effects upon some properties of the alloys [3].
Therefore, it is considered that the effect the grain size is of great importance to understand the propertied of cemented carbides.
Table 1 The properties of cemented carbide obtained activated tungsten oxide (1) and b1ue tungsten oxide (2) Number Density / g· cm-3 Hardness / HRV Strength / N· mm-2 Weight loss rate / % 1 14.9234 92.4 2260 0.973 2 14.9072 91.9 2110 0.978 Conclusions In summary, fine cemented carbide in the diameter of less than 1 μm is obtained activated tungsten oxide.

The total number of the stirring arms was 10 bars, its length was 60mm.
The crystal grain pull-out and trans-granular fracture were observed in at the verge of greater than 8μm micro-pores of the sample II.
At the verge of micro-pores the crystal grain pull-out and transcrystalline fracture were observed.

In particular, the γ' precipitates tend to agglomerate, while carbide reactions lead to the formation of undesirable continuous carbide films along grain boundaries.
The carbides are mainly located in the interdendritic and sub grain boundary.
At the same time there is a large number γ΄ phase keeps cubic morphology still.

It is clear that melt spraying method can eliminate the impurity phase, the relative content of Li4SiO4 increase and grain growth according to the XRD data.
Scherre, grain growth when Li4SiO4 pebbles are heat treated by FWHM data of Li4SiO4 pebbles to calculate and the relative content of Li2SiO3 elevate.
Serious lithium sublimation with heat treatment temperature increase produces a large number of Li2SiO3, cause strength of Li4SiO4 pebbles lower.

WC ball with diameter of 6 mm was used, the movement speed was 4 cm.s-1, load 5 N and number of cycles was 10 000.
Cross-section of the fracture area of coating AlTiNmulti is characterized by bigger columnar grains of AlN, compared to AlTiCrN these grains are somewhat smaller due to the effect of Cr addition, which caused the softening of the coating structure.

The alumina coating is a good anti-wear coating, in order to improve the toughness of the coating by adding low melting point titanium dioxide can improve the binding force between the alumina grains[1,2].
Fig.3c is debris concentration area,where has a large number of small and uniform debris.There is no obvious furrows[9,10].
Sol -gel synthesis and characterization of fine-grained ceramics in the alumina–titania system [J].Thermochim.Acta,2008,468:10-14

Among these, a number of activities have been carried out on the investigation of the optical properties of lanthanum magnesium hexaaluminate (LaMgAl11O19, LMA) which has a distorted magnetoplumbite structure and consists of spinal-like blocks separated by mirror planes [3, 4].
The thickness of the platelet-like grain was uniform and the sizes were within the range of 1 to 2 μm.
But the development of the grains was not complete enough.

The size, coherence, morphology and numerical density of the precipitated phase control the hardening of the alloy, while the size of the matrix grains controls its ductility.
B 100mm A 100mm D 100mm C 100 mm A B C D The grains boundaries Fig.1.
Their appearance is observed even on the machine wire and the deformed wire at ɛ = 21.26% and the decrease in their number on the other two deformations (Fig. 2).

In this first part, a large number of cement mortars were designed, on which the effect of active ingredients (microsilica, slag) on the pH value over time were tested.
The main change in the formula of concrete mixtures C1 to C5 was the addition of a coarse fraction of aggregate, i.e. a grain size of 8 to 16 mm.
The next step in terms of the mixture composition was the addition of a coarse fraction of aggregate, i.e. a grain size of 8 to 16 mm.
The average particle size is about 0.1µm which is approximately ten times smaller than cement grains.
Due to this fineness the space between the coarse grains of cement is better filled.