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However, polycrystalline silicon solar battery material is composed of many grain, grain orientation is different, there are a large number of defects such as dislocations, fault, impurity sediment in the material, how to control the polycrystalline silicon solar energy has no very good solution of the problem of material defects.

The concrete process is as follows: Pyrite oxidized as FeSO4 and H2SO4 in groundwater which contains oxygen, that is acid and contains a large number of Fe2+, but FeSO4 just is the intermediate product of the oxidation process.
Untreated acid mine water goes into the surface of water bodies after it is discharged, and when it was used as irrigation water into farmland, it will destroy the soil structure, make the soil harden, inhibit the growth of plants, and seriously cause the death of large crops and grain crop yield.
The technological process is: acidic waste water → oxidation Pool → limestone roller → reaction pool → emissions. 2.1.2 Up-flow expansion changing filter speed method Up-flow expansion changing filter speed method is that putting fine grain limestone or dolomite into cone shape tower, and the water flow bottom-up through the filter material.

CRC is a composite construction material consisting of high-performance carbon fiber filament yarns and a matrix of fine-grained concrete.
This work therefore focuses on CRC with already technically approved components and applications: Irrigated façade elements consisting of SBR-covered textile reinforcement and a fine grained concrete.
Neither the number of reinforcement layers nor the thickness of the concrete cover showed significant influence on the leaching behavior.

Related researches [6,7] found that the irreversible deformation was owing to the slip constraint between grains.
A large number of dimples can be observed in the broken zone in Fig. 7(c), 7(f).
[15] Xu X，Effect of Grain Boundary Design and Control on Mechanical Behavior of SUS304， MS thesis.

Actually, the reduction of fatigue resistance for this used Inconel 600 alloy is closely related to the existence of a large amount of strip-shaped inclusions and poorer cleanliness in grains.
From the microstructures in Fig.5, it can be seen that a large number of strip-shaped inclusions are found.
Under larger magnification in Fig.5b, a great quantity of granular inclusions in the grains is easily observed.

Gaseous way should at least consider air immersion external exposure, surface sediment external exposure, internal radiation of inhaled air and eating vegetables, grain, milk, and meat.
Liquid way should at least consider shore sediments external exposure, water immersion external exposure, waterborne external exposure, drinking water internal radiation, internal radiation of ingestion of vegetables, grain and fruit due to contaminated water, internal radiation of ingestion of aquatic organisms, internal radiation of ingestion of animal products (meat, milk) due to contaminated crops and drinking water.
For all monitoring objects, the number, range, distance and other information about the representativeness of sample/monitoring points should be reviewed.

Lightweight construction, especially in the area of transportation engineering, is of increasing significance even with decreasing numbers of pieces.
From Fig. 5(a), uniform particles of TiO2 in metal matrix with fine grained eutectic particles of aluminium are observed.
Fine grained aluminium solid solution with the precipitated eutectic phases of Mg2Si and some in-soluble phases.

The authors of [8-12] performed a number of experimental studies of the molecular interaction forces of spherical particles of metal and ceramic powders by atomic force microscopy.
The manifestation of physical phenomena seal (void fill) and sliding some other mineral materials with smaller grain size and quantitative assessment provide not only the filling volume units monolithic substance or material, but also the formation of the optimal macro-structure of the mineral part of building composites, which include, in particular, multicomponent high-quality concretes.
Penetrational rheometer for research and control of rheological properties of fine-grained dispersed systems / / Acceleration of scientific and technical progress in the construction materials and construction industry.

EDS mapping of the elements showing some Mo and Ni compounds segregating in the consolidated sample In the figure 5 the microstructure of the sample after spark plasma sintering process reveal dispersoids near the grain boundary area and solid solution formed after the process of mechanical alloying and consolidation.
The VEC number of this alloy indicates the formation of FCC phases in amounts larger than BCC and the diffraction pattern verify this theory [9].
The powders were consolidated via spark plasma sintering and the microstructure study realized on the consolidated sample revealed a homogenous structure with two solid solution phases and fine components segregating at the grain boundary.

Further, the core diameter should be at least three times larger than the largest aggregate grain size.
That is why a diameter of 75 mm is an optimal compromise considering the density of reinforcement and the aggregate grain size.
If it is not possible to use cores with a diameter of 75 mm, cores with a diameter of 50 mm can be used but the number of tests must be higher.