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., during an impact of different size and mass grains into aircraft skin plating, which occurs in the first and second phase of takeoff and landing as well as during taxing.
Information concerning samples Type of fabric reinforcement Number of reinforcement layers The average weight of a single sample [g] Mass fraction of reinforcing fabric in the sample [g] The mass fraction of resin and hardener in the sample [g] Percentage of fabric reinforcement in the sample Percentage of resin and hardener in the sample Glass 7 16.50 5.38 11.12 32.6 67.4 Glass and carbon 5 – glass fabric 16.22 3.84 10.84 23.7 66.8 2 – carbon fabric 1.54 9.5 In the first phase, we prepared control boards, which measured 250 x 350 mm.
The test findings of the samples under impact loading are characterized with an extensive range of values, which indicates the need to increase the number of sample groups under this kind of impact loading to achieve higher reliability of the tests.

At the same time, it can also express number changes of cultivated land within a certain time, the formula as follows[1]: (1) is the dynamic degree cultivated land change in the period; represents the terminal year area of cultivated land; is the initial year area of cultivated land; represents the year interval, if the value of is positive, it has represented an increase of cultivated land over this period; if not, it has represented an decrease of cultivated land over this period.
Driving forces analysis of dynamic change of cultivated land resources According to the thoughts and requirements of the principal component analysis, the data from 2001 to 2010 were selected as the base, combined with the collected data, 12 representative index were selected :X1 represents total population (million), X2 represents rural population (million), X3 represents GDP (million), X4 represents per capita GDP (yuan), X5 represents total retail sales of social consumer goods (million), X6 represents fixed asset investment (million yuan) , X7 represents the added value of first industry (million), X8 represents the added value of second industry (million yuan), X9 represents the added value of the third industry (million yuan), X10 represents grain yield(T), X11 represents net income of rural residents (yuan),X12 was the total power of agricultural machinery (10000 kW) [4].
Changes in social total retail sales of consumer goods was large, about 3.25 billion yuan in 2010, accounted 3.14 times of 2001(1.03 billion yuan), the rapid development of township enterprises, the development and perfection of factory premises and infrastructure in construction constantly prompted economic development, but also caused a large number of cultivated land were occupied for non-agricultural construction, resulting in the loss of the amount of cultivated land.

EDEM is discrete element software that has the ability to model entire boundary value problems directly with a large number of particles.
Lu, M. [8] put forward the spherical particles stacking method, such as the cumulative clouds ten goals of the shape of the grain, and a tetrahedron eight goals in the round state of particles.
And we reduced the length of the sleeper to one half of the original, and reduced the number of tamping pines the corresponding.

Besides, there are also a number of twins observed on the vertical section, as well as some large cracks.
It is known that the twins are prone to occur when the motion of slip system is blocked in magnesium alloys, so the present formation of a number of twins should be attributed to the precipitation strengthening of Mg2Sn phase by restricting the slip system activation.
Higashi, Ductility enhancement in AZ31 magnesium alloy by controlling its grain structure, Scripta Mater. 45 (2001) 89-94

The length of each debris is proportional to the average length of dislocation junctions , and the number of debris in the shear zone equals to , where is the fraction of non-breaking junctions.
The given work includes evaluation of a fraction of insurmountable junctions from the total number of junctions under a fixed deformation axis [100] for different dislocation densities.
Popova, Grain structure, geometrically necessary dislocations and second-phase particles in polycrystals of micro- and meso-levels, Phys.

The reaction concentration of 0.3mol/L even when a large number of particles generated particulate alumina having an average diameter of about 100 nm, more complete crystallization at this time (Fig.2-c).
The core is formed without causing a large number of nuclei have enough time to grow further when the rate is greater than the growth rate of nucleation.
The reason may be as follows: temperature, grain also will grow, thus alumina particles grow.

Changchun as the famous industrial city, with the development of the city, "retreat into three" proposed policy, many industrial business bankruptcies, a large number of industrial legacy buildings were abandoned in the city.
Today, the industry has become the dominant economic force in Changchun, Changchun City, China's largest auto industry, is the new China Automotive Engineering photonics technology, biotechnology, applied chemistry cradle. 1.2 Reasons for the formation of the industrial legacy building Changchun City in 1953-1958 during the first five-year plan built a large number of industrial buildings，mostly located in the suburbs around the city, planning and construction of industrial zones.
（Picture 1, 2, 3） Picture7 Tian Xingfu mill fire Picture8 Fushun thick fire mill Picture9 Surroundings 2.1.1 Feature Before the liberation, Russo-Japanese occupied Changchun and construct in their occupied territories as flour, grain and oil processing based industrial buildings and its outbuildings.

However, the polycrystalline brittleness and thermal stability resulted from large grain size and the segregation of γ1 (Cu9Al4) are the main obstacles for the development of Cu-Al-based HTSMAs [1,2].
From Fig. 2, it is found that a large number of the copper-colored precipitate forms for the studied three samples.
Under the aged state, a large number of α(Cu) phase precipitate for three types alloys.

The surveys use a several number of electrodes laid in a straight line with an equal spacing.
The sandy silt as observed in the field predominantly rich with medium to dark grey, sandy silt material and minor fine grained size fraction of sandstone.
Here the aquifer was found at 3 m depth, which provided detailed spatial information regarding the aquifers vulnerability that cannot be obtained with a limited number of boreholes in the areas.

RE doping leads to the formation of RE-rich phases in interdendritic space and along grain boundaries of matrix phase (A2 disordered solid solution of Ga in α-iron lattice).
The binary alloy magnetizes faster reaching the highest value of μtot with a pronounced peak around 0.15 T (Fig. 1b), which indicates that a high number of domain walls are activated (displacing) and involved in the magnetization process even by a small applied magnetic field.
Acknowledgment The research was supported by Mobility and Reintegration Programme of the Slovak Academy of Sciences (MoRePro) number 19MRP0061.