14results about "Smoke/mist generation" patented technology

The invention discloses aluminum-based powder fuel with a grain boundary oxygen vacancy channel and a preparation method and application of the aluminum-based powder fuel, and particularly relates to the technical field of metal fuel and aluminum-based alloy powder fuel. The method comprises the following steps: heating and melting pure aluminum to form an aluminum melt; then, Al-RE intermediate alloy is added into the aluminum melt, and the total content of the rare earth element RE in the melt is adjusted to be 0.1-7 wt%; and finally, the uniformly mixed melt is subjected to controlled supersonic atomization and rapid solidification, and the aluminum-based alloy powder is obtained. According to the invention, after powder combustion, a rare earth oxide channel rich in oxygen vacancy defects is constructed at a crystal boundary, and then oxidative combustion is further promoted. Lattice distortion and in-situ solid solution of boron atoms are caused by the radius difference of double rare earth (Ce / La) atoms, so that the formation energy of oxygen vacancies is greatly reduced. In the combustion process, high-concentration oxygen vacancies form a high-speed oxygen transmission channel, barrier of a compact oxidation film is broken, oxygen can rapidly permeate into particle cores, and the burn-off rate and energy release efficiency of aluminum powder are remarkably improved.

A smoke producing method and device of the present disclosure produces a non-incendiary, organic-polymerization based, smoke-producing reaction. Some versions of the smoke are effective carriers for capsaicinoid compounds. The method of generating smoke comprises initiating a frontal polymerization reaction by heating a composition comprising a monomer compound that exothermically polymerizes upon initiation with an initiator compound and an initiator compound that initiates polymerization of the monomer compound present at a mass concentration that is at least five percent of the mass concentration of the monomer compound. The polymerization of the monomer compound is exothermic, and in one embodiment the concentration of initiator compound is at least five percent of the concentration of monomer compound. The smoke mainly comprises thermal decomposition products of the initiator compound.

The application discloses an aluminum-based powder fuel with a grain boundary oxygen vacancy channel and a preparation method and application thereof, and particularly relates to the technical field of metal fuel and aluminum-based alloy powder fuel. The method comprises the following steps: heating and melting pure aluminum to form an aluminum melt; then adding an Al-RE intermediate alloy into the aluminum melt, and adjusting the total content of rare earth elements RE in the melt to be 0.1-7 wt%; finally, performing controlled supersonic atomization rapid solidification on the uniformly mixed melt to obtain an aluminum-based alloy powder. After the powder burns, a rare earth oxide channel rich in oxygen vacancy defects is constructed at the grain boundary, and the oxidation combustion is further promoted. The lattice distortion caused by the difference in atomic radii of double rare earth (Ce / La) and the in-situ solid solution of boron atoms greatly reduce the formation energy of oxygen vacancies. In the combustion process, high-concentration oxygen vacancies form a "high-speed oxygen transmission channel", break the barrier of the dense oxide film, and enable oxygen to quickly penetrate into the particle core, thereby significantly improving the burnout rate and energy release efficiency of the aluminum powder.

To provide a self-submerging type warning flare capable of emitting smoke over a long period of time while suppressing enlargement in size.SOLUTION: A self-submerging type warning flare 2 includes a wooden columnar body 10 including an ignition hole 14. A bottom cover 20 to be weight is attached to a bottom unit of the columnar body 10. A plurality of ignition powder tubes 200 serially connected by a fuse 50 and an ignition device 100 for igniting the leading ignition powder tube 200 are stored inside the columnar body 10. A plurality of cylindrical storage spaces 12 communicated with the ignition hole 14 for storing the plurality of ignition powder tubes 200 are formed in the columnar body 10. The plurality of cylindrical storage spaces 12 are serially communicated by having adjacent cylindrical storage spaces 12 coupled with each other by a communicating hole 16. A self-submerging device 30 is provided in between the cylindrical storage space 12 at beginning of the line and outside of the columnar body 10. The ignition powder tubes 200 lit last in lighting order is stored in the cylindrical storage space 12 where the self-submerging device 30 is provided.SELECTED DRAWING: Figure 3

The invention discloses a color smoke generating agent containing a nanometer material, and belongs to the technical field of pyrotechnic compositions, and the color smoke generating agent comprises the following components by weight: 25-40% of an oxidizing agent; 20%-30% of a reducing agent; 25%-40% of an organic dye; 2%-10% of a nanoscale functional additive; the nanoscale functional additive can be selected from one or a mixture of any two or more of nanoscale silicon dioxide (SiO2), nanoscale aluminum oxide (Al2O3) and nanoscale perlite powder. The invention is used for solving the problems of low smoke generation speed, small smoke column diameter and unsaturated smoke color of the existing colored smoke generation agent.

The present invention relates to method of testing the bacterial filtering efficiency of a fabric, the method including the steps of preparing a solution including bacteria, peptone water and NaCl, feeding said solution including bacteria to a nebulizer, generating an aerosol of said bacterial solution and flowing said solution through a cascade impactor to provide a plurality of bacteria colonies in a plurality of plates present in a plurality of stages of said cascade impactor, characterized in that the concentration of NaCl in the peptone water used to prepare said bacterial solution is in the range of 30g / L to 150g / L and in that the temperature of said cascade impactor is in the range of -15°C to 15°C.

The application discloses a method for preparing single-dose multi-frequency spectrum cold smoke screen interference material, and comprises the following steps: modifying B-based powder once to obtain hydroxyl-modified B-based powder; mixing the hydroxyl-modified B-based powder with spherical material and modifying the hydroxyl-modified B-based powder again to obtain modified B-based powder containing amino groups; the modified B-based powder containing amino groups is attached to the surface of the spherical material; the spherical material with the modified B-based powder containing amino groups attached thereto is dried once; modifying silicon-based powder three times to obtain hydroxyl-modified silicon-based powder; mixing the dried spherical material with the modified B-based powder containing amino groups attached thereto and the hydroxyl-modified silicon-based powder, and then performing liquid-free grinding to obtain mixed powder; and drying the mixed powder twice to obtain the single-dose multi-frequency spectrum cold smoke screen interference material, so that the single-dose multi-frequency spectrum smoke screen interference material has good dispersion effect in the air, long duration, wide interference wave band, and will not decompose in the air.

The invention belongs to the technical field of energetic materials, and discloses a core-shell structure aluminum-based microwave energetic material and a preparation method and application thereof.The preparation method comprises the steps that in order to construct an interface layer on the surface of aluminum powder, the aluminum powder is added into a silane coupling agent solution, a cyclodextrin solution, a butyl titanate solution and a perfluorododecyl mercaptan / dopamine hydrochloride solution, and four kinds of suspension liquid A are formed; adding the suspension B containing the bimetallic composite oxide into the suspension A, and stirring to obtain four suspensions C; and filtering, washing and drying the suspension C to obtain the aluminum-based microwave energetic material with the core-shell structure. According to the invention, interface chemical bonds or electrostatic interaction is constructed between aluminum and AB2O4 by using the interface layer, so that oxidation of aluminum is effectively prevented, interface polarization is enhanced at the same time, and a core / shell structure further shortens the mass and heat transfer distance of a reaction between fuel and potassium oxide, so that the microwave ignition delay time is remarkably shortened, and the microwave ignition efficiency is improved. Efficient microwave energy coupling and controllable combustion performance are achieved, and excellent microwave response characteristics are shown.

Methods of solar radiation modification (SRM) by stratospheric aerosol injection (SAI) of reflective particles and with respect to a desired climate state are provided. Methods comprise configuring the SAI by devising an optimized global spatio-temporal distribution of the reflective particles to keep key climate variables within desired ranges, monitoring the global climatic impact of the SAI to assess deviations from the desired climate state, and adjusting the SAI to counter the possible deviations of climate variables from their desired levels. Further examples relate to methods of tracking and authenticating aerosol particle batches deployed for solar radiation modification using batch-specific identifiers derived from markers incorporated into the particles. Deployed particles are later captured and analyzed to verify origin, assess stability and performance, and update a stored data record with deployment and lifecycle information.

A fuming device (1A) is provided with a long cylindrical case, an igniter (40) attached to one end of the case, and a smoke agent (50). The housing has a peripheral wall section (10) in which one end and the other end in the axial direction are closed, and includes a drug storage chamber (S) therein. The igniter (40) includes a heating element that generates heat by energization, and an ignition powder that is ignited by the heat generated by the heating element. The smoke agent (50) is housed in the agent housing chamber (S), and generates smoke by being ignited and combusted by the operation of the igniter (40). A plurality of discharge holes (11) for discharging smoke generated by combustion of the smoke agent (50) to the outside are provided in both the circumferential direction and the axial direction of the housing in a peripheral wall part (10) that defines a portion of the medicine accommodating chamber (S).

The present invention relates to the chemical industry involved in preparing different chemical products. More specifically, it relates to the industry involved in preparing agents related to the preparation of agents for seeding clouds and precipitating the water content thereof as rain. The advantage of the invention over the prior art is the efficiency of the method. This invention uses a different method characterised in that the seeding takes place by spraying a modifier of the surface tension of water micro-droplets onto said clouds. This method efficiently improves the collision and coalescence phenomenon in clouds. The invention increases precipitation in warm clouds from -5°C to 10°C.

This invention discloses a highly stable black non-toxic vapor oil and its preparation method, relating to the field of vapor oil preparation technology. Specifically, it addresses the problems of existing vapor oils lacking black color, being toxic, and having a short vapor retention time. The preparation method includes the following steps: S1, mixing and shaking a first raw material to obtain a first pre-mixed liquid; S2, ball milling the first pre-mixed liquid for a first preset time to obtain the finished vapor oil. The first raw material, by weight, comprises 38.8%–66.0% organic alcohols, 0.3%–1.1% inorganic salts, 0–1.1% organic esters, 0–43.6% purified water, and 10.0%–44.1% black pigment. This invention also provides a vapor oil prepared by the above method, with a corrosiveness rating of 1a, and the vapor oil retaining its original properties and capable of storage for at least 110 days.

A foamy composition for preventing frost in plants comprise a hydrolyzed protein compound, a bubble stabilizer, a bubble stability enhancer, and a wetting agent. The hydrolyzed protein compound contain a plurality of amino acids that at least one of the amino acids have a foaming capability. The source of the amino acids can be a plant or an animal source, so that the foamy composition also performs as a growth stimulant and plant strengthening. It leads to the improvement of the plant growth and reproduction.