186results about How to "Restrict growth" patented technology

The invention discloses a preparation method of copper nanoparticles with different particle diameters and relates to a metal nanoparticle. The invention provides a preparation method of copper nanoparticles with different particle diameters, which has simple, economic, environment-friendly process. The preparation method comprises the following steps: adding metal salt of copper chloride or copper acetate, a solvent, a protective agent, a complexing agent and a surfactant in a vessel in sequence, and stirring to obtain a mixture, wherein the protective agent is polyvinylpyrrolidone, polyvinyl alcohol, polyacrylic acid, or the like, the complexing agent is oleic acid, hexadecylamine, oleamide, or the like, and the surfactant is hexadecyl dimethyl ammonium bromide, sodium dodecyl benzene sulfonate or the like; adding a reducing agent in the mixture for reacting, wherein the reducing agent is ascorbic acid, sodium formaldehyde sulphoxylate, sodium borohydride, or the like; cooling the reactant till the temperature is below 40 DEG C, then adding a precipitating agent, mixing, and centrifugally separating; then washing with the organic solvent, centrifugating, and extracting the precipitate; and then drying the precipitate to obtain red powder copper nanoparticles with different particle diameters.

The invention relates to the field of nutrient solutions, in particular to a soilless vegetable culture nutrient solution and a preparation method. The soilless vegetable culture nutrient solution is prepared from sodium nitrate, urea phosphate, potassium nitrate, ammonium sulfate, magnesium chloride, Fe-EDTA, boric acid, manganese chloride, zinc sulfate, copper sulfate, sodium molybdate, mixed nitrogen-fixing bacterium solution and a nostoc extracting solution. The nutrient solution is simple and convenient to prepare, comprehensive in nutrient ingredient, high in biological activity and good in homogeneity, can decompose self-toxic materials produced by vegetables, remarkably improve the resistance, yield and the quality of the vegetables.

The invention provides a preparation method of an ultrafine grain rare earth magnesium alloy. The method comprises the following steps of: firstly performing solution treatment on a rare earth magnesium alloy cast ingot to obtain the rare earth magnesium alloy after the solution treatment; then performing heat deformation processing on the obtained rare earth magnesium alloy after the solution treatment to obtain a heat-deformed rare earth magnesium alloy plate, wherein the heat deformation processing temperature is 350 DEG C-450 DEG C; and finally performing accumulative roll bonding with the single-pass rolling reduction of 50% on the obtained heat-deformed rare earth magnesium alloy plate, and annealing to obtain the ultrafine grain rare earth magnesium alloy. According to the preparation method provided by the invention, a heat deformation processing-accumulative roll bonding compound process is firstly adopted to successfully prepare the ultrafine grain rare earth magnesium alloy, and the problem of deterioration of mechanical properties, which is caused by non-uniform distribution of thick and big LPSO (long period stacking ordered) phases in the alloy is effectively solved; and furthermore, the preparation method provided by the invention has the advantages of simple process flow and low equipment cost, and is favorable for further large-scale industrial production.

The invention belongs to the technical field of agricultural fertilizers, and particularly discloses a nitrogen-fixing microorganism compound fertilizer and a preparation method. The nitrogen-fixing microorganism compound fertilizer comprises polypeptide urea, a phosphatic fertilizer, polypeptide chelating potassium, a compound microorganism agent, a polypeptide compound, a soil conditioner, a medium trace element compound and a nutrition agent; the compound microorganism agent contains nitrogen-fixing bacteria, phosphate solubilizing and potassium solubilizing bacteria, photosynthetic bacteria, probiotics and adsorbate. The preparation method disclosed by the invention comprises the steps of preparing compound microorganism agent fermentation liquor, mixing the fermentation liquor with the adsorbate uniformly and preparing the compound microorganism agent and a microorganism envelope complex agent successively; mixing the microorganism envelope complex agent, a humic acid envelope organic fertilizer and a polypeptide envelope inorganic fertilizer uniformly, under the action of an electric field and a magnetic field, adding medium trace elements, spraying bone glue, and preparing nitrogen-fixing microorganism compound fertilizer particles. The compound fertilizer disclosed by the invention has the effects of adjusting nutrients, stimulating crop growth, improving the agricultural product quality, increasing yield and efficiency, preventing insect diseases, increasing soil fertility, loosening and improving soil quality and the like.

The invention belongs to the technical field of fertilizer, and particularly relates to biological-envelope organic and inorganic microbial fertilizer and a preparation method thereof. The fertilizer is prepared from, by weight, 10-30% of compound microorganism bacterium agents, 10-50% of major elements, 2-15% of medium trace elements, 5-50% of organic matter, 10-40% of calcium carbonate, 10-40% of kieselguhr and 1-10% of lactate, wherein the organic matter comprises one or more of molasses, polyaspartic acid and humic acid. According to the biological-envelope organic and inorganic microbial fertilizer and the preparation method thereof, the compound microorganism bacterium agents are used, so that the microorganism bacterium agents and the major elements can be applied together and the activity of the major elements cannot be lowered, the strain survival rate is high, the chemical fertilizer applying quantity is reduced, soil is improved, the soil fertility is enhanced, the soil ecology environment is improved, and the crop quality and yield are improved.

The invention discloses chimeric antigen receptor T cells targeting CD19, and application of the chimeric antigen receptor T cells. A chimeric antigen receptor for preparing the chimeric antigen receptor T cells comprises interleukin 2 signal peptide, an anti-CD19 single chain antibody, a CD8 protein molecular hinge region, a transmembrane region, an intracellular signal structural domain, and anintracellular signal transduction structural domain of CD3 zeta protein molecules which are sequentially connected in series. The chimeric antigen receptor T cells are used for preparing medicines orpreparations for treating hematological malignancies, wherein the hematological malignancies comprise CD19-positive acute B-lymphocytic leukemia, diffuse large B-cell lymphoma and non-Hodgkin lymphoma.

The invention discloses a CAR-T (chimeric antigen receptor T cell) for targeting CD19 and an application of the CAR-T. A CAR for preparing the CAR-T comprises interleukin 2 signal peptides, an anti-CD19 single-chain antibody, a CD8 protein molecule hinge region, a transmembrane region, an intracellular signal structure region and a CD3 zeta protein molecule intracellular signal conduction structure region which are connected in series sequentially and has the amino acid sequence shown in SEQ ID NO:9. The CAR-T is applied to preparation of a medicine or a preparation for treating hematologicalmalignancy, wherein the hematological malignancy comprises CD19-positive B-cell acute lymphocytic leukemia, diffuse large B cell lymphoma and non-hodgkin's lymphoma.

The invention discloses a method for preparing a lithium iron phosphate / carbon composite material by using aniline. The method comprises the steps that: trivalent iron salt and a phosphorus-containing compound are respectively dissolved in a certain amount of deionized water, such that solutions are prepared; a proper amount of aniline is dropped into the phosphorus-containing compound solution, and the mixture is stirred, such that the mixture is uniformly dispersed; the trivalent iron salt solution is slowly dropped into the water-soluble phosphorus-containing compound solution comprising aniline; the mixture is stirred for 3-5h under room temperature, such that a FePO4 / PANI precursor is synthesized. During the process, when Fe<3+> enters the water solution comprising PO4<3-> and aniline, FePO4 precipitate is first precipitated; simultaneously, Fe<3+> serves as a catalyst for promoting an oxidative polymerization reaction of aniline on the surface of FePO4 particles, such that polyaniline is produced and coated on the surface of FePO4. Therefore, FePO4 particle growth is effectively limited, and the FePO4 / PANI precursor with relatively small particle size is obtained. Lithium intercalation is carried out upon the FePO4 / PANI precursor, such that lithium iron phosphate / carbon is obtained. With the method, prepared lithium iron phosphate / carbon has the advantages of small particles and excellent electrochemical properties.

The invention belongs to the technical field of agricultural fertilizers, and particularly discloses a mineral function fertilizer and a preparation method. The mineral function fertilizer comprises non-monomer immunoglobulin, photosynthetic bacteria, bacillus, probiotics, rare earth elements, amino acid, vitamins, mineral elements, medium and medium microelements, a nano-carrier and a plant growth regulator. The preparation method comprises the steps of firstly preparing the nano-carrier containing a traditional Chinese medicinal extract, mixing a composite bacterial liquid containing the photosynthetic bacteria, bacillus and probiotics and the nano-carrier evenly, drying, and adding the amino acid and vitamins; adding the rare earth elements, mineral elements and medium and medium microelements under the effects of an electric field and a magnetic field; adding the immunoglobulin and plant growth regulator and mixing evenly; and spraying and pelletizing by using metasilicic acid mineral water, drying and sieving, and spraying a humic acid water solution on an outer layer to prepare the mineral function fertilizer. According to the mineral function fertilizer, the quality of the soil is improved, the fertility of the foil is enhanced, plant diseases and insect pests are effectively avoided, the growth of crops is promoted, and the yield and quality of the crops are improved.

The invention discloses a submerged macrophytes restoring process guided by water conservation fishery. By stocking silver carp and bighead carp and reducing COD (chemical oxygen demand), TP (total phosphor), chlorophyll and other chemical indexes of the water body, the process effectively reduces the algae biomass in the water body, improves the water body transparency, and achieves the aim of preventing algal bloom and improving the water quality, so an excellent growing condition is provided for aquatic macrophytes (in particular, the submerged macrophytes); and by adding fish and other key organisms eating attaching organisms, which is a key link in a food chain, the attaching organisms growing vigorously on the surface of the submerged macrophytes can be removed in time, and the aim of restoring the submerged macrophytes can be achieved.

The invention discloses a dissimilar metal connection method for a copper-aluminum pipe, comprising the following steps of: (1) firstly dipping the part to be connected of a copper pipe with a liquid brazing agent, coating paste non-corrosive brazing agent at the part to be connected of an aluminum pipe, and then inserting the aluminum pipe into the copper pipe so as to be butted into a joint to be welded; and (2) putting the butted joint to be welded into an inductor of a high-frequency power supply, heating the workpieces by using a high-frequency power supply; when a potassium aluminum fluoride brazing agent is melted, applying axial pressure immediately and maintaining the pressure; and after a wet round angle is formed on the end surface of the copper pipe, cutting off the power supply, and then finishing the connection. The obtained butted joint does not contain any oxidized slag and has high strength and high compactness, and the butting length of the joint can be randomly adjusted in a large range.

The invention relates to a brazing filler metal precoating vacuum brazing method for a titanium alloy and an aluminum alloy. The method comprises the steps of: (1) conducting surface cleaning on a titanium alloy plate and an aluminum alloy plate, (2) coating and airing a plating assistant at a to-be-brazed part of the titanium alloy plate, (3) placing the to-be-brazed part of the titanium alloy plate in a brazing filler metal pool for processing for a period of time, (4) grinding a brazing filler metal layer coated on the titanium alloy plate, requiring the brazing filler metal layer to be smooth and uniform in thickness, and (5) overlapping the to-be-brazed parts of the titanium alloy plate and the aluminum alloy plate, and placing in a vacuum brazier for brazing. With the adoption of the brazing method, the connection is reliable and is not broken; the technique is simple; the manufacturing cost is low; the brazing is conducted in the vacuum brazier; an oxidation film is prevented from being generated on the surface of the aluminum alloy due to a vacuum atmosphere; titanium is prevented from reacting with active gas; smooth wet spreading is ensured; and the method facilitates improving the quality of a brazed joint.

The invention relates to a preparation method of carbon resource for treating wastewater, which belongs to the technical fields of environmental protection, the wastewater and sludge treatment.The invention is characterized in that the acidic fermentation preparation process is used for treating the carbon source of mine wastewater with sulfate and hydrochloric acid, which makes the sludge acidic fermentation products contain 42 percent-85 percent of propionic acid, 5 percent-18 percent of acetic acid and 10 percent-40 percent of butyrate, so the short chain fatty acid is unnecessary to be extracted from supernatant of acidic fermentation reactor; the supernatant of the acidic fermentation reactor is used as the carbon source of sulfate reducing bacteria and directly added into the mine wastewater with the sulfate and the hydrochloric acid and the obtained; the invention solves the key difficult problem that a biological method is used for treating the acidic mine wastewater. The sludge acidic fermentation process has simple operation and the fermentation products, propionic acid, acetic acid and butyrate, can be used as low cost carbon sources for treating acidic mine wastewater biologically; at the same time, the process achieves the quantity reduction, resource utilization and stabilization of the sludge.

The present invention relates to a method for industrial production of a nano-silver composite antibacterial agent. In the prior art, a particle size of nano-silver is large and is not easily adjusted, nano-silver is unstable and is easily agglomerated, and a particle size of nano-silver composite particles is non-uniform. A purpose of the present invention is mainly to solve problems in the prior art. According to the present invention, the method for producing the nano-silver composite antibacterial agent is provided, wherein the method comprises the following steps: a) mixing silane having an amine functional group, alkoxy silane, silver nitrate or silver acetate, and water to form a mixing liquid; b) pumping the mixing liquid into a rotation disc at a high-speed rotation state in a dryer, carrying out centrifugal atomization to obtain tiny liquid droplets, and carrying out cyclone drying with hot air to obtain dried particle powder; c) separating the particle powder with a cyclone separator, and then collecting to obtain the nano-silver composite antibacterial agent with a uniform particle size. With the present invention, problems in the prior art are solved, and the technical scheme of the present invention can be used in production of antibacterial materials with characteristics of long acting and broad spectrum.

The invention discloses a rotor expander, and relates to the technical field of rotating piston type machines or engines. The rotor expander comprises a cylinder, a female rotor in the cylinder, and at least one male rotor, wherein two vertical grooves are formed in a projected blade, and extend to the inner wall direction of the cylinder; springs and cuboid air seals are arranged in the two vertical grooves; one ends of the springs are fixedly connected with the vertical grooves, and the other ends of the springs are connected with the cuboid air seals in the vertical grooves; a machine oil channel parallel to a main shaft and an inverted T-shaped machine oil outlet communicated with the machine oil channel are arranged between the two vertical grooves; an inverted T-shaped oil ring matched with the inverted T-shaped machine oil outlet is arranged in the inverted T-shaped machine oil outlet; and the inverted T-shaped oil ring extends to the inner wall of the cylinder. The expander has the characteristics of high mechanical efficiency, easy processing, no wearable parts, long service life and low operation and maintenance costs.

The invention relates to a preparation method of a high-voltage lithium-ion battery. The lithium-ion battery is assembled and prepared by using a conventional method, a cathode material is a carbon-coated cathode composite material LiCoPO4 / C, an anode material is lithium or carbon, an electrolyte is a conventional organic electrolyte added with an additive which is one of thiophene, biphenyl and furan or the combination of more than two in any proportions, and the additive consumption is 0.05-2 percent by weight of the conventional organic electrolyte. The invention has the advantages that (1) a uniform conductive film can be formed on the particle surface of a material by coating carbon on the high-voltage cathode material to benefit the embedment and the separation of lithium ions, and (2) the action of additives, such as the thiophene, and the like, ensures the stability of the electrolyte component. The method has simple process, is easy for industrialization, greatly improves the electrochemical performance of the ion battery by modifying the cathode material and optimizing the electrolyte and has wide application prospects in the field of the lithium-ion battery of a power type.

The invention discloses a preparation method of a micro-mesoporous ZSM-5 zeolite molecular sieve. According to the method, sodium metaaluminate serves as an aluminum source, ethyl orthosilicate serves as a silicon source, single-end quaternary ammonium surfactants and tetrapropyl ammonium hydroxide serve as template agents, and the mesoporous zeolite molecular sieve with a ZSM-5 microporous structure is subjected to hydro-thermal synthesis in an alkaline environment. The single-end quaternary ammonium surfactants can form ZSM-5 micropores in an oriented manner, hydrophobic tail chains of the single-end quaternary ammonium surfactants can limit micro-crystal growth, mesopore formation is promoted, mesoporous uniformity is improved by introducing second template agents, specific surface area is increased, and the finally obtained ZSM-5 zeolite molecular sieve has the advantages of good hydrothermal stability, high acid catalysis activity and the like of a conventional zeolite molecular sieve, is quite beneficial to reaction with macromolecules and effectively solves the problem of mass transfer limitation of a single-pore zeolite molecular sieve. The application value of the zeolite molecular sieve in the field of catalysis, adsorption separation and the like is greatly improved.

The invention belongs to the technical field of composite materials. The invention provides an MOFs / water hyacinth derivative material, a preparation method thereof and a degradation method of organic pollutants. The MOFs / water hyacinth derivative material is composed of water hyacinth biochar and a cobalt-based zeolite imidazate framework embedded in the water hyacinth biochar. The water hyacinth biochar is used as a carrier of the MOFs material, and the prepared MOFs / water hyacinth derivative material has excellent stability, conductivity and specific surface area, and is more beneficial to charge transfer and mass transfer processes between cobalt active sites and pollutants; and due to the pore limiting effect of the water hyacinth biochar, crystal growth of the MOFs derivative metal oxide in the thermal decomposition process can be effectively limited. The MOFs / water hyacinth derivative material disclosed by the invention has strong capability of activating persulfate to generate free sulfate radicals, so that the MOFs / water hyacinth derivative material has efficient and lasting capability of catalytically oxidizing organic matters, and the defects that a catalyst is easy to agglomerate, the activation time of persulfate is long and the like are effectively overcome.

A skeleton template for synthesis of nano silver is made with DNA, so that growth of nano silver can be effectively limited, and agglomeration of the nano silver is prevented. The nano silver grown isin chain shape. Compared with spherical nano silver, the nano silver herein under the same concentration has better antibacterial or antistatic effect; DNA is bio-based macromolecules, so that the agent is green, the sources of materials are rich, the macromolecular chains contain massive phosphorus and nitrogen long-chain polymers as well; under heating, phosphorus-nitrogen synergistic flame retardance can be achieved, and the flame retarding effect is significant; nano DNA / Ag is multifunctional powder that can inhibit bacteria and electrostatic electricity and retard inflaming; the multifunctional finishing agent uses a waterborne UV curing system, water is used as a dispersing medium which is green; after the agent is used to finish cloth, and finishing can be performed just through reaction for 30 s to 2 min under ultraviolet exposure; compared with traditional high-temperature baking modes, the production method is simple to perform, significant in advantage and easy to use to implement industrial production.

The invention discloses a novel near-infrared quantum-dot-doped aluminium phosphate mesoporous glass nanometer compound and a preparation method thereof. The PbS-quantum-dot AlPO4 mesoporous glass nanometer compound is AlPO4 mesooprous glass doped with PbS quantum dots with different dimensions. The preparation method of the quantum-dot-doped aluminium phosphate mesoporous glass nanometer compound comprises the following steps: step 1, preparing a PbS quantum dot solution with two kinds of luminescence peak-value wavelength and a mixed solution with fresh quantum dots and ripened quantum dots; step 2, immersing AlPO4 mesoporous glass prepared by employing a sol-gel method in the quantum dot solution of the step 1 for one time or for independently two times; and step 3, taking the immersed mesoporous glass out from the solution, and performing moistening washing and drying to obtain the PbS-quantum-dot AlPO4 mesoporous glass nanometer compound. Tests prove that under pumping of near infrared, the PbS-quantum-dot AlPO4 mesoporous glass nanometer compound is capable of generating broadly tunable luminescence or double-peak luminescence at near infrared wave band, and has important application to the field of broadband optical transmission, multiband response optical communication materials and devices.

The invention discloses traditional Chinese medicinal distiller's yeast and a preparation method. The distiller's yeast is prepared from rice flour, starter, Chinese wingnut leaf, folium mori, leontopodiumforrestianum Hand.-Mazz, Xiaozong root, sweet potato leaves, peach leaves, fiddlehead and licorice root. The traditional Chinese medicine is subjected to microbial glycolysis, and then the rice flour and the starter are added for secondary fermentation, so that medicinal components of the traditional Chinese medicine are sufficiently acted and more effective components and antibacterial substances are also generated; the contents of polysaccharide, flavones and vitamins in the distiller's yeast are increased, and the growth of sundry fungi is limited; rice wine prepared from the distiller's yeast disclosed by the invention is abundant in nutrition, contains traditional Chinese medicinal components, and can be used for adjusting body functions.

The invention relates to a method for biologically purifying industrial circulating water. The method is characterized in that a biodegradation reactor is arranged in a circulating water system; nitrobacteria and denitrifiers are taken as inocula in the biodegradation reactor; at least part of the circulating water enters the biodegradation reactor to be biologically treated; the water from the biodegradation reactor enters the circulating water system; and the denitrifiers contain one or two of kocuriapalustris FSDN-A, arthrobactercreatinolyticus FDN-1 and flavobacteriummizutaii FDN-2. Compared with the prior art, the method has the advantages that the biological treatment method is adopted to treat the nutrient sources needed by microorganisms before the circulating water enters the device, so that the microorganisms brought in by the circulating water in the circulating process are difficult to survive, and then growth and reproduction of the microorganisms in the circulating water system are controlled.

The invention discloses a preparation method of a mesoporous-microporous dual pore ZSM-5 zeolite nano sheet. According to the method, sodium meta-aluminate is taken as the aluminum source, ethyl n-silicate is taken as the silicon source, a Bola type amphiphilic molecule with dual quaternary ammonium heads is taken as the template; and the mesoporous-microporous dual pore ZSM-5 zeolite nano sheet is synthesized through a hydrothermal method under an alkaline condition. The Bola type dual head quaternary ammonium surfactant can form ZSM-5 micro pores, moreover, the hydrophobic tail chains of thesurfactant can inhibit the growth of microcrystal, and thus uniform and sequenced mesopores are formed. The nano sheet has a 90 degree intersected intergrowth structure and has a card house shape. The repeatability is good, and the synthesized ZSM-5 zeolite nano sheet has the advantages of a common zeolite molecular sieve such as good hydrothermal stability, high acid catalytic activity, and thelike. Moreover, the nano sheet is beneficial for the reactions that macro molecules participate in. The mass transfer limitation of a single-channel zeolite molecular sieve is broken through, and theapplication value of zeolite molecular sieves in fields such as catalysis, adsorption separation, and the like, is greatly increased.

The invention discloses a quasi-solid electrolyte PVA(Polyvinyl Alcohol)-zinc-air battery, which comprises an air electrode taking reduction action, a zinc electrode taking oxidation reaction, electrolyte and a battery case, wherein the air electrode, the zinc electrode and the electrolyte are accommodated in the battery case, the electrolyte is jelly solid PVA-KOH-H2O alkaline polymers (PVA quasi-solid electrolyte), and a battery diaphragm is arranged between the air electrode and the zinc electrode. The quasi-solid electrolyte PVA-zinc-air battery has the beneficial effects that 1, the adopted solid electrolyte is jelly solid and has a certain toughness, the growth of zinc dendrite can be obstructed, the battery internal short circuit caused by diaphragm piercing due to formation of zinc dendrite thorns is prevented, the service life of the battery is prolonged, and the integral performance of the battery is improved; 2, the occurrence of battery electrolyte leakage can be obviously prevented through the solid electrolyte, so the integral performance of the battery is improved.

The invention provides a knapsack traveling automatic fertilizer spreader, relating to a machine for spreading fertilizer. A charging basket opening is provided with a basket cover, the bottom part of the charging basket is provided with an underpot internally provided with an upper end part of a feeding pipe which is fixed by a flexible fixator, the feeding pipe is in an L-shaped, and the corner is an arc transition. In addition, related facilities can be added on the fertilizer spreader as follows: the feeding pipe is arranged with a guy ring and a locking ring matched with the guy ring so as to control the switch of the fertilizer spreading; a trough matched with the feeding pipe is arranged below the front part of the charging basket; a filter screen is arranged in the charging basket; the lower end part of the feeding pipe is connected with a manifold; the branch pipe of the manifold is connected with a spray pipe, etc. The design principle of the invention is that granular fertilizer has certain fluidity, and the fertilizer can flow outwards to form a spreading effect under the vibration effect when a person carries the charging bucket on the back. The invention has the beneficial effects of directly spreading on crops, saving power, labor and fertilizer, having good fertilizing effect, simple construction and low cost, and being favor of protecting human bodies; and compared with spreading the fertilizer manually, the invention improves the working efficiency by 3-4 times.

The invention discloses a MoS2@C composite anode material for a lithium ion battery and a preparation method thereof, MoS2 sheets in the composite anode material are stacked disorderly and intertwinedto form a wormlike microsphere structure, and the MoS2@C composite anode material comprises 38-43% of Mo, 47-53% of S and the balance of C. According to the invention, MoS2 and a carbon material arecompounded; the prepared anode material has a wormlike structure; the diffusion path of Li<+> can be shortened; the composite material has excellent rate capability; and the carbon layer coated on thesurface of the MoS2 sheet can limit the further growth of the MoS2 nanosheet and can inhibit the problem of easy volume expansion of the MoS2 composite material in the cycle process, thereby effectively enhancing the rate capability and cycle stability of the lithium ion battery anode material.

The invention relates to graphene-based nano zero-valent cobalt-iron-copper lubricating oil. The lubricating oil comprises the following components: base oil, graphene-based nanoparticles, an antioxidant, a viscosity index-reducing improver, a dispersant and an anti-foaming agent, as well as other additives, wherein other additives comprise one or more of an anti-rust agent, a pour point depressant, a viscosity increaser, a detergent and a demulsifier, wherein the graphene-based nanoparticles certainly contain three substances, namely graphene-based nano zero-valent cobalt, graphene-based nano zero-valent iron and graphene-based nano zero-valent copper. The lubricating oil provided by the invention can improve conditions of the lubricating oil; and furthermore, all the components have excellent dispersivity and stability, so that excellent friction reduction and wear resistance effects can be realized, and the lubricating oil further has a good self-repair function.

The invention discloses a young seedling protection cover. The protection cover comprises a protection cover body, a viewing window is arranged on the top of the protection cover body to be used as a protection part, an umbrella-shape protection cover is arranged on the top of the protection cover body, an opening is arranged on the bottom of the protection cover body to be used as a buried part; and multiple air-passing holes are formed in the wall of the protection cover body. A spiral screwing structure of a screw is embedded in the wall body of the buried part. In the provided technical scheme, the top part of the protection cover can be held by a user to screw spirally, the buried part can get deeply into the ground through the spiral screwing structure of the screw, so that the area with bred seeds is sleeved with the protection cover; invasions and damages to the young seedlings on the seedling breeding area by wind and sand can be prevented by the umbrella-shape protection cover, and the growth of the young seedlings is not restricted by the shape of the umbrella-shape protection cover, meanwhile the humidity of the seedling breeding area can be kept at a certain level, and the survival rate of the young seedlings of the seedling breeding area can be increased.

The invention discloses a preparation method of a hollow iron oxide cathode material in a porous structure. The preparation method comprises the steps of weighing an organic ligand compound and iron salt at a mole ratio of 1:(1-10), adding a solvent, performing uniform stirring and dispersion, allowing a mass ratio of a solute to the solvent to be 1:(100-800), preparing a high polymer coordinationpolymer by a hydrothermal / solvothermal method under conditions of a pH (potential of hydrogen) value of 3-11, the temperature of 100-200 DEG C and reaction time of 10-72h, roasting the prepared polymer at a 200-800 DEG C oxygen-containing atmosphere, and obtaining the hollow iron oxide cathode material in a multilevel structure. A hollow ferric oxide particle in the porous structure is obtained by a hydrothermal / solvothermal - high-temperature burning two-step method; the method has the advantages that ferric ions are arrayed orderly in a long range in a lattice; an organic framework supporting the ferric ion can limit growth of the ferric oxide particle in a three-dimensional direction via aerobic burning; the obtained ferric oxide particle is good in particle size uniformity and dispersity; and the increase and improvement of a multiplying factor and cycle performance of a material are facilitated.

An industrial gas turbine engine for electrical power production includes a high pressure spool and a low pressure spool in which the low pressure spool can be operated from full power mode to zero power mode when completely shut off, where the low pressure spool is operated at high electrical demand to supply compressed air to the high pressure compressor of the high pressure spool, and where turbine exhaust is used to drive a second electric generator from steam produced in a heat recovery steam generator. The power plant can operate at 25% of peak load while keeping the unused parts of the power plant hot for easy restart when high power output is required.