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The present invention relates to a diblock copolymer that may facilitate formation of a finer nano pattern, and be used for manufacture of an electronic device including a nano pattern or a bio sensor, and the like, a method for preparing the same, and a method for forming a nano pattern using the same, The diblock copolymer comprises a hard segment including at least one specific acrylamide-based repeat unit, and a soft segment including at least one (meth)acrylate-based repeat unit.

The invention relates to a method for producing a single-sided composite stainless steel cold rolling base stock. The method comprises the following steps of: firstly, selecting carbon steel or low-alloy steel as a substrate, processing oxidation layer on surfaces of the substrate and a compound plate, and assembling and stacking the compound plate and the substrate; secondly, drilling, detectingleakage and vacuumizing; and finally, performing hot continuous rolling, coiling a hot rolled strip on a double coiling opening production line and trimming to form two strip coils serving as the cold rolling base stock, wherein the material and thickness of the cold rolling base stock can be combined freely to meet the requirements of different users, and the cold rolling base stock is widely applied in industries of petroleum, chemical engineering, salt industry, water conservancy, electric power and the like. The single-sided composite stainless steel cold rolling base stock is used as a resource-saved product to reduce the consumption of precious metal, reduce engineering cost substantially and realize the perfect combination of low cost and high performance, so the cold rolling base stock can create great social benefits.

The invention relates to an inorganic foaming heat-insulation material and a preparation method thereof. The preparation method of the inorganic foaming heat-insulation material comprises the following steps of mixing 80 to 100 parts of water glass, 0.2 to 5 parts of a foaming agent, 1 to 3 parts of mineral powder, 1 to 3 parts of a water-soluble polymer, 0 to 1 part of emulsion and 0 to 10 parts of hollow glass beads or floating beads at a normal temperature, and carrying out heating foaming of the mixture. The inorganic foaming heat-insulation material has the characteristics of light weight, high strength, small heat conductivity, flame-retardant properties, no toxicity and no pollution. The preparation method adopts the raw materials which are cheap and can be acquired easily, has simple processes, and can realize the preparation of products having different shapes and specifications according to actual requirements. The inorganic foaming heat-insulation material obtained by the preparation method can be widely utilized for equipment and buildings.

The invention relates to a precipitation-strengthening type AlCrFeNiV system high-entropy alloy and a preparation method thereof, and belongs to the technical field of metal materials. The high-entropy alloy comprises, by atomic weight ratio, 0.30-0.60 of Al, 0.20-0.89 of Cr, 0.60-1.20 of Fe, 1.50-3.50 of Ni and 0.10-0.30 of V; and the high-entropy alloy is prepared by a smelting molding process and a deformation heat treatment process. According to the precipitation-strengthening type AlCrFeNiV system high-entropy alloy and the preparation method thereof, the content of each element is regulated, and the synthesis process is optimized, so that a modulation structure of two-phase coherency of unordered FCC and ordered L12 is obtained; and the grain size is small, and the strength of the high-entropy alloy is significantly increased.

Disclosed is a novel ecological habitat revetment. The novel ecological habitat revetment comprises a gravity type retaining wall, the gravity type retaining wall is built by grouted building blocks, a water communicating pipe for being communicated with inner and outer water bodies is arranged on the gravity type retaining wall, the revetment further comprises an ecological habitat area, the front portion of the ecological habitat area is connected with the gravity type retaining wall, a geomembrane is arranged at the rear of the ecological habitat area, the ecological habitat area is built by rock blocks layer by layer, the water communicating pipe is connected with a cavity layer of the ecological habitat area, cavities are reserved between adjacent rock blocks in the cavity layer, adjacent rock blocks on upper and lower layers which are adjacent to the cavity layer are tightly connected, each corner of the rock blocks on the upper layer is built on rock blocks of the cavity layer, wood boxes without top covers are placed in the cavities, and the wood boxes are contacted with the rock blocks. By means of the novel ecological habitat revetment, an ecological revetment mode of building a section of ecological habitat in a grouted building block protective section is achieved, and the problem of poor ecological performances in prior revetments is well solved.

The invention provides a metal-air battery air electrode and a preparation method thereof. The method comprises the steps: mixing a metal organic framework material with nitrogen source micromolecules, so that the nitrogen source micromolecules are adsorbed in the metal organic framework; then, carrying out high-temperature carbonization treatment in a nitrogen atmosphere; finally, carrying out acid treatment to remove metal particles to obtain a nitrogen-doped porous carbon material; and preparing the porous carbon material into slurry, and coating the surface of a conductive substrate with the slurry to obtain the air electrode of the metal-air battery. The nitrogen-doped porous carbon prepared by the method has high specific surface area, high nitrogen content and excellent oxygen reduction catalytic activity, the PVDF binder is added into the prepared slurry to ensure the connection between the catalyst and the substrate, and the erosion of electrolyte to the catalyst is resisted through the PTFE film, so that the stability of the electrode is maintained. The preparation method provided by the invention is simple and feasible, has good repeatability, is convenient for large-scale production, and can be used in the field of air batteries, especially air electrodes of lithium air batteries.

The invention discloses a preparation method of functionalized graphene oxide containing phosphorus and silicon. According to the method disclosed by the invention, two N-H bonds on gamma-aminopropyltriethoxysilane are simultaneously connected with DOPO by utilizing a simple and convenient experiment method to synthesize a compound containing phosphorus and silicon elements in one step. Accordingto the preparation method disclosed by the invention, graphene is modified through utilizing the compound containing the phosphorus and silicon elements, so that the dispersity of the graphene in an organic solvent and the compatibility of the graphene in epoxy resin are hopefully improved. According to the preparation method, the phosphorus and silicon flame-retarding elements are introduced intothe graphene oxide to synthesize a small-molecular flame retardant and formation of a coke layer is facilitated through a cooperative effect of the phosphorus and silicon flame-retarding elements andthe graphene oxide; the thermal stability of the epoxy resin is hopefully improved. The preparation method has moderate reaction conditions and the functionalized graphene oxide does not contain halogen elements and is an environment-friendly type novel flame retardant.

The invention discloses a bonded flexible water proof and drainage coiled material for a road and a railway tunnel and a laying method thereof. The coiled material comprises a water proof and drainage part and more than one bonding belt vertically coated one side of the water proof and drainage part. The water proof and drainage part comprises a main board of a water proof board and a plurality of protruding strip ridges vertically arranged on one side of the main board of the water proof board. Drainage blind drains are formed by grooves between the protruding strip ridges. The bonding belts and the protruding strip ridges are arranged on the same side. The bonded flexible water proof and drainage coiled material can closely adhere to an initial support. Even if a secondary lining pouring method from bottom to top is utilized, the gap generation at an arch portion is avoided, the mountain water of the initial support is discharged easily, and the water proof effect is good through the combination of the water tightness and the drainage. The drainage blind drains can be easily formed by geotechnical cloth. The blocking of the drainage blind drains and the puncture for the main board of the water proof board caused by sands and stones can be avoided through the filtration of the geotechnical cloth. The water proof board can be extended and transformed easily under outside strong extrusion or extension, and the damage to the main board of the water proof board can be prevented.