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Table.1-1 Grain Composition Change of Soaking Condition Test Number Composition of Different Particle Size (mm) /% ＞100 100~80 80~50 50~20 20~10 10~5 ＜5 1 0 20.3 34.2 30.1 10.7 3.6 1.1 2 0 10.2 24.7 45.2 14.5 4.1 1.3 3 0 7.9 6.3 62.5 16.4 5.3 1.6 4 0 4.3 3.6 64.3 19.3 6.2 2.3 5 0 0 2.7 65.7 22.1 6.7 2.8 6 0 0 2.5 62.5 24.5 7. 2 3.3 7 0 0 1.7 57.4 27.6 8.9 4.4 8 0 0 0 55.1 29.7 10.3 4.9 Table.1-2 Grain Composition Change of Dry-Wet Cycle Condition Test Number Composition of Different Particle Size (mm) /% ＞100 100~80 80~50 50~20 20~10 10~5 ＜5 1 0 5.9 24.2 40.1 13.8 4.8 1.2 2 0 3.0 14.7 58.1 17.2 5.6 1.4 3 0 0 4.3 67.5 19.8 6.6 1.8 4 0 0 2.9 62.7 22.0 8.4 3.0 5 0 0 0 61.3 25.5 9.1 4.1 Fig.1-1Particle Content of Size 50-80mm Fig.1-2 Particle Content of Size 20-50mm The disintegrating data of soft-rock samples that under different conditions as the Table.2-1 and Table.2-2 show.
(2) With the increase of the test number, the particle content of disintegrating things whose particle size are larger than 50mm will reduce to zero gradually, but those particle size are 20-50mm first increase and then reduce after reach its peak.
Therefore, the crystal layer can inhale a large number of polar water molecules and make the spacing between crystal layers increased, the volume expanded【4】.
In the sunlight, the clay mineral particles of illite and montmorillonite will expand rapidly and cause non-uniform stress and a large number of micro-pore in rocks.
The non-uniform expansion of carbonaceous shale will make the rock generate uneven internal stress and produce a large number of micro-pores will destroy the natural internal structure of carbonaceous shale and lead it to disintegrate.

In the metal mines of China, the tails that were piled up on the ground already have reached more than 4 billion tons, and this number increased 2 ×108 tons every year.
The characteristics of metal mine tails mainly include: (1) the grain size is extremely fine; (2) The quantity in weight was very large; (3) the toxicity is very strong; (4) Transporting concentration is very low.
According to incomplete statistics in 1998, in the metal mines of China, the tails that were piled up on the ground already have reached more than 4 billion tons, and this number increased 2 ×108 tons every year.
The characteristics of metal mine tails mainly include [2]: (1) The grain size is extremely fine.

It has a number of coupled models, including sediment transport [17].
The median grain size diameter is 0.15-0.45mm.
The bed-load transport is only minimally influenced by the grain diameter.
Numerical simulations of sandwave migration can be sensitive to the number and placement of vertical grid levels.
The model results are weakly sensitive to the stretching parameters but may reduce the number of vertical grids.

A large number of irregular cracks appear on the floor, which has become the biggest problem related to the residential projects’ quality.
This paper puts forward the following measures to control cracks: 1. strict control of the water for concrete; 2.strict control of concrete slumps; 3. improving the quality of aggregate (such as sands or stones) and increasing the number of coarse aggregate; 4.
The maximum of casting floor concrete Table 1 Height of pumps The maximum of concrete Below 50m 120±30mm 50~100m 150±30mm Above 100m Adjusting datum according to the actual conditions Improving the quality of aggregate (such as sands or stones) and increasing the number of coarse aggregate.Improving the quality of aggregate ,increasing the number of coarse aggregate and decreasing sand rates are helpful of reducing the shrinkages of concrete ,among which improving the quality of aggregate is the key and basis.Reasonable choices of grain diameters and contents of coarse aggregates can decrease the porosity of coarse aggregates ,reduce the number of mortar and play an important role in reducing the sand rates and adhesive materials such as cement.
Improving the quality of aggregates ,increasing the number of coarse aggregates and appropriately decreasing sand ratios are in favor of decreasing the shrinkage of concrete .Sand rates should be within 40％.

Grain nucleation occurs on the side of the crucible and the grain size is fine because the temperature is near liquidus.
Recrystallisation occurs and the liquid forms around the grains which are fine and equiaxed.
There are a number of challenges still including: improving reproducibility; problems with solid-liquid segregation leading to inhomogeneous mechanical properties; a tendency to brittleness (but great hardness and wear resistance).
The mechanism is thought to be via promoting precipitation hardening mechanisms and fine grain sizes [66].
Courtois, Fine Grained Metal Composition.

In accordance with the research program, fine-grained limestone concrete was used for the manufacture of prototypes of elements and structures using limestone-shell rock spray of Buldinsky (Odessa region) as a filler (stone grade 4-10 kgf/cm2).
Studies have shown that the best results are obtained by porous carbonate aggregate with the largest fraction size up to 5 mm, that is, coarse-grained sand.
Portland cement with an activity of 526 kg/cm2 was used as a binder in concrete, working compositions of fine-grained limestone concrete were chosen optimal by preliminary selection.
For fine-grained limestone concrete with a strength of kg/cm2 at loads close to destruction, the value of the prism strength coefficient was 0,82-0,90.
Concretes on porous aggregates, in comparison with heavy concretes, have a number of positive features, such as reduced density and thermal conductivity, increased adhesion of cement-sand mortar to the aggregate, a significantly increased level of microcracking boundaries and high crack resistance.

Alloys that have been worked heavily, with a microstructure of elongated, flattened grains, are particularly prone to this damage.
Corrosion products building up along these grain boundaries exert pressure between the grains and the end result is a lifting or leafing effect.
Damage often initiates at end grains encountered in machined edges, holes or grooves and can subsequently progress through an entire section.
Level 1 corrosion found during the accomplishment of the numbered Corrosion Tasks indicates an effective program.
This is due to the discontinuous precipitates along grain boundaries in the overaged condition versus the continuous grain boundary phase for alloys tempered to T6.

This increase may be due to the coalescence of the small grains because of the increase in kinetic energy [25, 26] and to the reduction of the joints of the grains [27].
In this case, an increase in the crystallite size of the hexagonal phase with temperature is observed, indicating a grain growth process.
Instead, grains tend to grow by diffusion-controlled mechanisms, where atoms move and rearrange to minimize the total energy of the system.
The excess of oxygen recorded by the over-stoichiometry could be contained in the grain boundaries [30, 31].
Larger grains and reduced porosity can reduce the number of contact points between grains, thereby reducing electrical conductivity [30, 31].

The issue of the behavior of asphalt mixtures, their rheology and predicting models formation of cracks and permanent deformation is engaged in a number of authors, collectively eg. in [1].
Both values ​​must be for the assessment less than 0.85, which between themselves compares the number of repeated loading or heavy transport vehicles, resp. design axle, and the theoretical ability of a material to withstand repeated loads, see formula (1) , (1) in which Dcd is the design value of the total relative failure under the design period, TNVcd is the design value of the total number of passes TNV for the design period, TNVcd,lim limit number of passes TNV for the design period.
Structural layer can be divided by the maximum grain size, which is used in asphalt ground.
The most commonly used maximum grain size are 11, 16 and 22 mm.
The resulting composite is necessary to declare the bulk density, guarantee unconfined compressive strength and resistance CHSS. 4.1 Experimental part Asphalt mixture for asphalt and cement concrete was made of 50/70 bitumen and aggregates from quarry Markovice with a maximum grain size of 16 mm.

,Huai’an 223005, china; a lvjianqiang1@yahoo.com.cn Key words: crop straw; biogas; diffusion; discharging; Preface According to Agriculture Ministry statistics, China's grain output in 2007 for the first time over 500 million tons, In 2010 China's total grain output reached 1092800000000 kg, Realization of half a century since the first seven consecutive years of increase.
Food production stable at more than 10,000 billion kilograms for four consecutive years, grain sown area reached 16.48 million units of area, Realization of half a century since the first seven consecutive years of increase.
The "PRC Renewable Energy Law." was formally implemented in January 2006 November 12, the same year, the Ministry of Finance, National Development and Reform Commission, Ministry of Agriculture, State Administration of Taxation, the State Forestry Administration jointly issued by five ministries "On the positive development of modern agriculture, solid advance construction of socialistic new rural area of a number of opinions". 2007 No. 1 document of the Central Committee "on the positive development of modern agriculture, solid advance construction of socialistic new rural area of a number of opinions" clearly pointed out:" continue to increase investment in the construction of biogas in rural areas, support for local conditions and medium-sized farms to carry out the construction of biogas, accelerate the implementation of rural sanitation projects, promoting human and animal dung, crop residues, garbage and sewage into the comprehensive management and use."
Ministry of Agriculture, "Agricultural Biomass Industry Development Plan (2007-2015)" "in the country built a number of agricultural biomass energy base, the initial agricultural biomass industry in the market."
The application of straw biogas The rural household biogas status After years of efforts, China has built a large number of rural households using manure digesters, it is reported that a family of 3 to 5 built an eight cubic meters of traditional household manure digesters, and raised 2 to 3 pigs, plus Master manure, methane produced each year, these on the whole shall meet fuel and lighting for three meals a day [2].