30results about How to "Prevent water erosion" patented technology

The invention provides a chemical curing agent as well as a preparation method and application thereof and belongs to the field of curing agents. The chemical curing agent is prepared from a first component and a second component, wherein the first component is mainly prepared from water, polyvinyl alcohol, polyacrylamide and acrylate; the second component is a solution containing sodium silicate with the percentage concentration of 2 to 5 percent. The preparation method of the curing agent comprises the following steps: mixing the polyvinyl alcohol, the polyacrylamide and the acrylate with water, and carrying out heating reaction at the temperature of 60 to 80 DEG C for 30 to 120 minutes to obtain the first component; preparing the sodium silicate solution with the mass concentration of 2 to 5 percent, thus obtaining the second component. The chemical curing agent has bionic performance, i.e., the chemical curing agent can form chemical crust on the sand surface; the chemical crust is similar to biological crust, and can be used for long-acting immobilized governance on sand grains, so that the weather-proof capability and the water erosion resistance of desert are improved.

A method for immobilizing liquid radioactive waste is provided, the method having the steps of mixing waste with polymer to form a non-liquid waste; contacting the non-liquid waste with a solidifying agent to create a mixture, heating the mixture to cause the polymer, waste, and filler to irreversibly bind in a solid phase, and compressing the solid phase into a monolith. The invention also provides a method for immobilizing liquid radioactive waste containing tritium, the method having the steps of mixing liquid waste with polymer to convert the liquid waste to a non-liquid waste, contacting the non-liquid waste with a solidifying agent to create a mixture, heating the mixture to form homogeneous, chemically stable solid phase, and compressing the chemically stable solid phase into a final waste form, wherein the polymer comprises approximately a 9:1 weight ratio mixture of styrene block co-polymers and cross linked co-polymers of acrylamides.

The present invention relates to the technical field of crop cultivation, and in particular to a method of plowing land under the condition of full coverage of corn stalks on the surface, comprising the following steps: working in stages and layers, directly plowing the plow layer and plow bottom layer in the autumn of the first year, Change the distribution state of the straw; reorganize the plowing layer within the sowing depth range before sowing in the spring of the second year to build a composite seed bed. The invention proposes a plowing method under the condition that the corn stalks are fully covered on the surface, which is beneficial to soil water and moisture retention, increases the temperature of the seed bed, and prolongs the growing period of the crops.

The invention discloses a reflection type sheet laser amplifier of a ridge structure. The reflection type sheet laser amplifier of the ridge structure comprises a window, ridge structure sheet gain media, diode laser arrays, cushion blocks, a cooling and radiating device and a reflector, wherein m pairs of ridge structure sheet gain media are arranged on the inner walls of two cooling and radiating slabs of the cooling and radiating device in a vertically staggered mode, the two cooling and radiating slabs of the cooling and radiating device are vertically parallel to each other, m is a positive integer, the window is arranged at one ends of the cooling and radiating slabs, the reflector is arranged at the other ends of the cooling and radiating slabs, the plane where the window is located is parallel to the plane where the reflector is located, each ridge structure sheet gain medium is pumped by a corresponding diode laser array. According to the reflection type sheet laser amplifier of the ridge structure, two-pass four-time amplification of injected pulses can be achieved by the ridge structure sheet gain media without coating, low incidence loss of the surfaces of the gain media is guaranteed, and a series of problems caused by coating of the surfaces of the gain media are avoided. The reflection type sheet laser amplifier of the ridge structure has the advantages that quality of output light beams is good, and efficiency is high.