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Most materials used in tribological systems are polycrystalline and consequently surfaces of tribological contacts consist of a number of orientations (crystallographic planes).
In polycrystalline materials, the problem becomes more complex since grain boundaries will influence the surface energy and hence the adhesion force.

It is a more perfect material which preserves its mechanical and chemical properties for a long time and can accept a large number of radioactive elements contained in radioactive wastes into the lattice.
The grain size ranges from 15 to 25µm.

Abstract: Kidney or gall-bladder stones are solid accretions (crystals) of dissolved minerals in urine or bile juice found inside the kidneys or urethras and gall bladder, with varying size from as small as a grain of sand to as large as a golf ball, the occurrence whose in the human is well known, although its pathogenesis is not well understood.
According to literature, a number of biomaterials, such as collagen, blood vessel walls, DNA, RNA etc., are found to possess the property of electrets which is an electric analogue of a permanent magnet having the capability to retain quasipermanently, an induced polarization.

The average grain size indeed decreases from 160 to 90mm with the Mn addition because of its austenite stabilizing nature.
Evolution of different cluster parameters with the 600°C aging time: a) chemical composition (CC), average size (AS) (radius), b) number density (ND).
At short aging times, the number density of precipitates formed in the Fe-Cu alloy is far lower than in the Fe-Cu-1Mn alloy, see Fig.3b.
Due to the simultaneous augmentation of the number density of precipitates, the magnitude and kinetics of over aging are also magnified at least up to 120 min of aging at 600°C.
As a result of the increases of the precipitation kinetics and of the number density of Cu-rich particles the peak aging time is reduced in the Mn bearing alloy.

Wind technology has grown substantially since its original use as a method to grind grains and will only continue to grow.
The number of the blades of a turbine has great impact on its performance.
Large number of rotor blades decreases the stability of the turbine.

Compression at a very early age leads to an increase in the number of peaks related to hexagonal hydroaluminates and aluminum hydroxide.
This is illustrated by an increase of a number of related peaks in X-ray patterns.
In reference [23] this fact is deemed to be related with compaction under compression and reduction of porosity [24]; this is seen as a result of moisture diffusion to unhydrated cement grains and increase of degree of hydration in other writings [25-27].
In addition to comparison of heights of peaks of cement phases and fixing new peaks of hydration products, the number and intensity of peaks of CAH10 and C2AH8 hydrates, crystalline phase of AH3 (gibbsite), C4AH(13-19) and cubic phase of C3AH6 were estimated.
Stressed samples aged 7 days with water-cement ratio =0.28 generate a greater number of hydration products than the stressed samples with water-cement ratio =0.25 (Fig.3).

The absorbances at 202 and 253 nm increasing linearly to the bilayer numbers for the film (given in the inset of Fig.1) show that the assembly is successful and uniform.
The close-packed clusters of SiW11Co-P2O7 nanoparticles with a mean grain size of ca. 26 nm are seen clearly in the film.
From the lower to the upper curves, the number of SiW11Co-P2O7 / PDDA bilayers is 0, 1, 2, 3 ·· 7 and 8, respectively.

As a dimensionless number, C-value is adjustable between 0（no erosion place like water area）~1(completely erosion place like bare land), through the maximum of which is hardly possible.
Covering 1020,000 sq.m², it has become an important commodity grain base.
The land in northeast black soil area has good soil conservation capacity, due to its forest acreage and vegetation number and variety. 3.

The porosity of AZ31 Mg alloy foams corresponding to 30s to 180s are around 35.0%,72.0%, 57.2% while the pore number increases.
In Fig.2 it is found that eutectic and intermetallic compounds phase (SiO2, MgO, Al2O3 etc:) are segregated in grain boundaries.
If the content of the foaming agent is increased, and the incubation time and temperature are increased as well, the number of pores, pore size, and porosity of the foam will be increased consequently.

Brief Introduction of SOA SOA, an architectural model, can deploy, assemble and use loosely coupled, coarse-grained application components in distributing mode through the network.
By the combination of middleware technique and object-oriented software design method, a large number of component-oriented architecture modes are implemented in application systems, which support component reuse and expansion.
According to the results of the analysis of system requirements, the system can be divided into business components, and in accordance with the SOA architecture ideas, each component is composed of the front page, a number of basic services and composite services.