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The generation of random aggregate model In order to construct the random aggregate model in numerically, need to use Walraven formula [5] determination of aggregate size and number of particles.
The gradation formula in concrete specimen plane took a point probability with aggregate diameter is D grain size.
With the load increasing, the number of plastic unit in concrete beams is growing, both occurred in the interface adhesive layer between aggregate and mortar, at inferior extremity position in the beam bending.

Oil shale is belongs to sapropelic coal, which is composed with Fine-grained and sedimentary rock containing solid flammable organic, meanwhile, which is the natural mineral formed by the animal remains through corruption and coalification [3,4].
It is probably because that the roughness degree of the sample‘s surface was high, and the area and the number of holes in the surface of oil shale char was bigger than oil shale after the same modification, it is benefit for the H2S’s absorption to modification ash.
The number of surface area and the pore volume are supposed to play an important role.

Introduction Many recent studies in materials science have focused on ivestigation of materials with a structure containing a large number of individual objects.
The principle of it was generating a large number of spheres with chosen diameter with Gaussian distribution.
Standard Test Methods for Determining Average Grain Size.

The seed fell into grain tube from the feed tongue tube and then were imported into the opener.
The number of seed of every turn is basically stable, which has a linear relationship with working length. 1-feed cup 2- block set 3- feed tongue 4- feed end ring  5-seeding shaft 6- feed roller Fig.2 Structure of outer-fluted feed Rotary Knife Roller Structure [4].
The number of blade is 40.

The origin of our restoration systems Since the last decade of the last century we have conceived, proposed and created a number of solutions for joining timber items, as well as for bonding timber with other materials.
This type of intervention was since successfully used on a great number of occasions.
Müller, Adhesive bond strength of end grain joints in softwood with varying density: in Holzforschung, Vol. 62, Walter de Gruyter, Berlin-New York, 2008, pp. 237-242 [4] WCTE 2010; G.

However, in the conventional truing process, the diamond abrasives on the wheel surface will be dropped off by the diamond truer and the acting abrasive number on the wheel surface will be decreased.
In the conventional dressing process of the resinoid bonded diamond wheel, the abrasive on the wheel surface will be sharpened and the acting abrasive number will increase on the wheel surface by rubbing by the GC dresser.
Table 1 Grinding conditions Wheel Grain size Diameter Rotational speed Resinoid bonded diamond wheel SDC1200 Φ70 mm 12,000 min-1 Work piece Rotational speed Binderless tungsten carbide 500 min-1 Depth of cut 0.5 μm/pass Feed rate 0.5 mm/min Coolant Solution type 0.5 mm Approximate radius: 100 mm Φ50 mm 10mm Fig. 6 Geometry and view of Fresnel lens mold for structured grinding. 0 100 100 0 60 0 90 0 100 70 Bottom side surface Outer side surface Outer side surface Bottom side surface μm μm Fig. 7 Compare the diamond wheel edge of before truing and after truing.

The mean grain size of the alloy was about 18 μm.
Φ4Φ4 (a)Rotating bending (b)Ultrasonic Fig.1 Shape and dimensions of specimens Specimen surface Compound layer Specimen surface Compound layer Fig.2 Microstracture of nitrided alloy Specimen surface Compound layer Fig.3 S-N curves of plain specimen (a)Ultrasonic (b)Rotating bending Detail of notch 10 4 105 10 6 10 7 10 8 10 9 0 200 400 600 800 1000 1200 Stress amplitude a (MPa) Number of cycle to failure, Nf (cycle) Aged alloy-US Nitrided alloy-US Aged alloy-TC Nitrided alloy-TC 10 4 10 5 106 10 7 10 8 0 200 400 600 800 1000 1200 Stress amplitude a (MPa) Number of cycle to failure, Nf (cycle) Aged alloy-RB Nitrided alloy-RB Aged alloy-TC Nitrided alloy-TC Fig.6 shows relation between crack growth rate ddN and stress intensity factor range ΔK in both alloys under ultrasonic.

Finally, metal impurities in the grain boundaries can increase atomic activation energy and decrease diffusion coefficient of metal impurities.
When solidification interface shape is convex, the silicon ingot is easy to produce big air bubble and large numbers of defects.
When interface shape is concave, it is prone to form fine crystal zone and produce impurity entrainment, pore and large numbers of defects [9].

The theoretical studies show that the concentration of antisite defects on both the sublattices are comparable, but the number of vacancies on Nb sublattice is much higher than the number of vacancies on the Sn sublattice [11].
In general, vacancies are consumed by sites that act as sinks, such as interfaces, grain boundaries, and edge dislocations [14].

It was determined that the number of lateral cracks that would be observed from one cross section of cemented carbide was dependent on the loading force and the number of loading cycles.
The propagation of cracks may be dominated by the interfaces WC-to-Co, which depends on the particle size, distribution of the WC grains but also on the binder composition and the interfacial energy of WC/WC and WC/Co interfaces [7].