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50results about How to "Storage stability" patented technology

Large flow liquid oxygen supercooling method based on supersonic ejector

The invention discloses a large flow liquid oxygen supercooling method based on a supersonic ejector. The large flow liquid oxygen supercooling method comprises the steps that a heat exchanger used inconventional saturated liquid nitrogen supercooling liquid oxygen is used as a primary heat exchanger, and the liquid oxygen with a supercooling flow rate greater than 4500 L/min can be supercooled from 92K to 80K; a secondary heat exchanger is arranged at the downstream position of the primary heat exchanger to supercool the liquid oxygen which is supercooled to 80K and with the supercooling flow rate greater than 4500L/min to below 67K; the secondary heat exchanger is filled with liquid nitrogen in a saturated state, the temperature of the liquid nitrogen in the secondary heat exchanger isno more than 64K, and an air outlet of the secondary heat exchanger is connected with an ejected airflow inlet of the supersonic ejector; an ejector airflow inlet of the supersonic ejector is connected to a gas outlet of a gas generator; the supersonic ejector sequentially includes a mixing section, a super-expansion section and a sub-expansion section which are arranged coaxially in the directionof the airflow; and the mixing section is a conical isobaric mixing chamber with a contracted cross section. The large flow liquid oxygen supercooling method can meet the needs of rapid cooling and filling of large-flow liquid oxygen before launching such as CZ-5. In addition, the pumping capacity of the supersonic ejector can be matched with the load, and more security and reliability are achieved.
Owner:PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV

Monodisperse polystyrene microsphere, and preparation method and application thereof

The invention relates to a monodisperse polystyrene microsphere, and a preparation method and application thereof. The polystyrene microsphere is prepared through soap-free emulsion polymerization with styrene as main monomers and N-isopropylacrylamide and vinylpyridine as comonomers, or with N-isopropylacrylamide and 1-vinyl imidazole as comonomers. The preparation method comprises the following steps: adding styrene and N-isopropylacrylamide into a reaction container filled with water; then adding vinylpyridine or 1-vinyl imidazole; introducing inert gas; carrying out heating to 60 to 85 DEG C and maintaining the temperature for 3 to 10 min; then adding an initiator according to the addition amount of styrene; and carrying out a reaction for 4 to 48 h. The monodisperse polystyrene microsphere provided by the invention can be used for preparation of emulsion paint, variable-color printing ink and photonic crystal devices. Compared with the prior art, the polystyrene microsphere provided by the invention has the advantage of good monodispersity; a photonic crystal film with a brilliant color can be prepared from the polystyrene microsphere without addition of other auxiliary agents; and the color of the photonic crystal film varies at different observation angles.
Owner:SHANGHAI JIAO TONG UNIV

Water-dispersible carbon black pigment and process for producing aqueous dispersion thereof

A water-dispersible carbon black pigment excellent in water dispersibility and ink performance; and a process for producing an aqueous carbon black dispersion. The water-dispersible carbon black pigment comprises a mixture of a carbon black (A) having a nitrogen-adsorption specific surface area of 150 m<2> / g or larger, a DBP absorption of 95 cm<3> / 100 g or higher, and a specific coloring power of 120% or higher and a carbon black (B) having a nitrogen-adsorption specific surface area smaller than 150 m<2> / g, a DBP absorption less than 95 cm<3> / 100 g, and a specific coloring power of 120% or higher in a proportion of from 20:80 to 80:20 by weight, these carbon blacks having undergone a surface oxidation treatment and a neutralization treatment, and at least the carbon black (A) having undergone a disaggregation treatment. The process comprises separately dispersing the carbon black (A) and the carbon black (B) in an aqueous oxidizing agent solution to conduct an oxidation treatment, subjecting these carbon blacks to a neutralization treatment, subjecting at least the carbon black (A) to a disaggregation treatment, thereafter purifying them, subsequently mixing the carbon black (A) with the carbon black (B) in a proportion of from 20:80 to 80:20 by weight, and then dispersing the resultant water-dispersible carbon black pigment into an aqueous medium.
Owner:TOKAI CARBON CO LTD

Gob-side entry retaining roof cutting method

The invention discloses a gob-side entry retaining roof cutting method. The gob-side entry retaining roof cutting method comprises the following steps that S1, the thickness of a direct roof and basicroof of a roadway is calculated according to mine geological data, a drilling track is designed, and a directional drilling machine is used for conducting directional drilling operation according tothe drilling track; S2, one end of a saw line is connected with a drill pipe end head by using a connector at one end of a drilling hole after the drilling hole is opened, and when the drill pipe is pulled out, the drill pipe drives the saw line to penetrate through the drilling hole to complete saw line layout; and S3, assembly of a wire saw machine is completed, the saw line is arranged on the wire saw machine, the wire saw machine drives the saw line to carry out cutting operation to the direct top and the basic top, and after the saw line penetrates through the direct top and the basic top, gob-side entry retaining roof cutting is completed. According to the gob-side entry retaining roof cutting method, the wire saw machine is used for carrying out static cutting operation, thus the stability and safety of an existing structure can be saved to the greatest extent, power of the wire saw machine is high, the cutting ability and the cutting efficiency are improved, at the same time, the labor intensity of the staff is reduced, and convenience is brought to construction operation of the staff.
Owner:河南明德矿山技术开发有限公司
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