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In many parts of China, a large number of rural labor outflows in young adults, women left-behind in rural areas and there is Labour force of the ageing population as the main body of agricultural labor, rural aging, and the women of the phenomenon is very serious, the development of agriculture outlook is not optimistic.
The disappear every day 20 administrative villages in China, the number of rural migrant workers has more than 240 million [3], because of the lack of rural labor, the agricultural labor efficiency is low, some food crops cultivation has from season to season, and even some land is flow, the phenomenon has become increasingly serious.
Number of fields in our country's rural areas, farmer’s household co., LTD., the price of grain and other crops is not determined by the market, even if the country has subsidy, but farming income is not high, even at a loss.
To fundamentally solve the problem of shortage of "farmers", must arouse the enthusiasm of young farmers with agricultural production, grain and other agricultural prices gradually rise, should improve the system of agricultural subsidies, increase the intensity of investment in agriculture, to improve the rural infrastructure construction, rural medical insurance, endowment insurance system, etc, break the urban and rural dual economic structure, to solve the trouble back at home of young engaged in agriculture, arouse the enthusiasm of its engaged in agricultural production.
Again, for the agricultural industry supporting policy to continuously strengthen, to give support, farmer cooperative organizations of farmers as the main body of the construction of the new cooperation organization not only improves the farmer's production efficiency, promote the growth of awareness of the farmers' market, but also reduce the specialization of production cost, has trained a large number of new farmers.

Basalt fiber Hemp fiber Flax fiber Bamboo fiber Number of coupons 10 10 10 10 Density [g/m3] 442 281 479 408 Tensile strength [MPa] 1880 535 240 58.3 (CoV) [MPa] (101) (46.1) (27.6) (1.58) MOE [MPa] (CoV) [MPa] 90968 (10286) 36529 (2357) 18052 (1498) 5304 (545) Elongation [%] 2.06 1.4 1.3 1.1 Thickness [mm] 0.14* 0.155* 0.267* 0.600 * Evaluated using equivalent thickness as defined by manufacturer data sheet.
The beams were of low-quality, with the common defects of wood: cross grain, shrinkage cracks and knots.
Even being cautious due to the fact that the statistical sample is limited in terms of number of beams, it can be clearly inferred that the natural fibers brought about a significant increase in the load-carrying capacity of the wooden beams.
Thus it is the wood in the tension zone that reaches failure: this always happens starting from a defect in the wood, in most cases a knot or another defect such as a high degree of grain deviation.
FRP type and configuration Beams number Max load F [kN] Bending strength Freinf/Funrinf [%] Mid span deflection at max. load w [mm] Deflection index [MPa] D [%] none 2 40.90 18.4 - 45.0 - flax, 2 layers 3 56.60 25.5 38.4 71.2 58.2 basalt, 2 layers 3 67.80 30.5 65.8 63.1 40.2 The application of reinforcement to the beam tension zone has the further characteristic of mitigating the influence of defects in the wood, blocking the propagation of the cracks.

This waste can also cause a number of problems, including being allowed to accumulate, being disposed of into rivers which can cause water pollution, or being burned which can cause air pollution.
In general, the higher the variation in the mass ratio of cellulose, the higher the grain size of the Fe3O4/Cellulose crystals obtained.
However, in the FS6 sample, the crystal grain size obtained decreased compared to the FS5 sample size.
These results correspond to the previous research by Ibrahim, et al. (2018) that the absorbance value of Fe3O4 lies in the range of wave numbers from 270 to 300 nm [30].
Another study by Tran, et al. (2021) also revealed that Fe3O4 appears at a wave number of 263 nm and cellulose appears at a wave number of 365 nm [7].

The average numbers of seedlings emerged and the emergence rates of sunflowers were calculated.
However, the reduced number of the pH value was different according to different application amounts of desulfurization gypsums.
The increased number of EC value of soils changed with the application amounts of desulfurization gypsums.
(3) Compared with the increased number of total salt content in the soils which were applicated desulfurization gypsums, the increased number of total salt content in the soils which were not applicated desulfurization gypsums into, was more and reached 0.636.
Only a small number of soil indices and test times were monitored in the experiment.

The results indicate that the alloy produce a larger number of slip bands and dislocations after cold deformation, it can accelerate the precipitation of phase during aging, improve the microhardness and electrical conductivity.
(1) where j is volume fraction of precipitates, t is aging time, b and n are constants. b depends on the temperature of phase transformation, composition of solid solution and size of crystal grain. n depends on the type of phase transformation and nucleation location.

The number of internal properties includes those that change the relative content of the structural components of concrete – its composition, hardening conditions, and etc.
Results Figure 1 shows the relaxation curves for samples of fine-grained concrete of composition 1: 0.4: 2.5 (cement: water: aggregate) by weight with a consumption of Portland cement of 560 kg / m3.

In terms of tool wear and bluntness, there has been a number of researches taking account into the physical nature of cutting tools, - providing basis for selection of cutting tools apart from clarification of the current pattern of tool wear and bluntness.
The tool is sharpened on the 3E642 tool grinder with a fine-grained grinding wheel, followed by smoothening with diamond powder.
Number of measurements n for a cutting length L is 5 and initial linear wear A0=6.5mm.
Experimenting results - chukrasia wood with 8Cr6NiVTi cutting tool material Tooltip radius r with different cutting length L [m] 5 250 1250 3250 6250 8000 Number of measurements 16 16 15 24 23 26 Mean of tooltip radius 4.05375 6.99125 9.43133 12.1417 14.8357 16.1065 Variance of tooltip radius 0.291 0.416 0.517 0.599 0.647 0.685 In the process of the experiment, depending on the milling tool tip radius r on the cutting length L we acquired with different iterations.
Then we obtained m variance s12, s22,…, sm2 with the different number of samples n1, n1,…, nm (Table 3).

The total defect number of the epitaxial layers grown on the "epi-ready" 4-inch SiC wafer is 63, and the usable area is 97.6%, indicating the high quality of our SiC substrates. 1.
Various defects, such as hexagonal voids, inclusions, micropipes, polytype transformation, small-angle grain boundaries, and dislocations, are easily formed in the crystals due to the variation of these processing parameters.
The total number of 4-inch wafer micropipe is 3, far less than 0.1/cm2, and “zero micropipe” is realized.
The defect numbers on the whole surface of epitaxial layers is 63, and the usable area is 97.6%, as shown in Fig. 17b.
The total defect number of the epitaxial layers grown on the "epi-ready" 4-inch SiC wafer is 63, and the usable area is 97.6%, which fully meets the requirements of device manufacturers and verified the high quality of our SiC wafers.

And it is also the periodical achievement of the Startup Foundation for Scientific Funds in Northeast Agricultural University, which is named “Research on the supportive policy of the soybeans industry based on the security of soybeans industry ” (Program Number:2009RC06).
In 1997, the consolidated average price of soybean in national grain wholesale market was 3.1yuan/kg, which continued to fall for several years and became 2.07yuan/kg in 2001.

A way of increasing the number of photons absorbed by a given surface is to define periodic structures with a period lower or greater than the wavelength of light.
The optical surface finish was reached by polishing with a series of diamond suspensions of reduced grain size, ending with a smooth silica gel.