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47results about How to "Uniform damage" patented technology

Medium-frequency furnace lining alumina-magnesia dry ramming material preparation and sintering process

The invention discloses a medium-frequency furnace lining alumina-magnesia dry ramming material preparation and sintering process, and relates to the technical field of steel metallurgy. A ramming material of the invention mainly comprises the following components in percentage by weight: 65%-75% of granules with the particle size being 0.5 mm-3 mm, 20%-45% of a powder material with the particle size less than or equal to 0.5 mm, 0.1%-0.5% of an admixture with the particle size less than or equal to 0.1 mm and 1%-3% of a high-temperature composite sintering accelerator with the particle size less than or equal to 0.005 mm. According to the method, the thermal shock resistance and the chemical corrosion resistance of the ramming material are improved through reasonable particle gradation, spinel is formed in use of a furnace lining in cooperation with a reasonable sintering process, generated expansion is matched with contraction generated by sintering, the sintering quality of the medium-frequency furnace lining after construction can be obviously improved, the overall strength of the furnace lining is excellent, the surface of the furnace lining is smooth, the damage is uniform, and the service life of the furnace lining is greatly prolonged.
Owner:浙江正锋实业有限公司

Second-order enhanced coupling beam type metal damping shock absorption system

The invention discloses a second-order enhanced coupling beam type metal damping shock absorption system. The second-order enhanced coupling beam type metal damping shock absorption system comprises a plurality of coupling beam soft steel dampers, the plurality of coupling beam soft steel dampers are distributed in a plurality of floors, and at least one coupling beam soft steel damper is arranged in each floor; each coupling beam soft steel damper comprises a first connecting plate and a second connecting plate, a first energy dissipation mechanism and a second energy dissipation mechanism are arranged between the first connecting plate and the second connecting plate, and the first energy dissipation mechanism comprises a first U-shaped energy dissipation plate and a second U-shaped energy dissipation plate; the second energy dissipation mechanism comprises a rectangular energy dissipation plate assembly; the first U-shaped energy dissipation plate and the second U-shaped energy dissipation plate are arranged on the two sides of the rectangular energy dissipation plate assembly; and the rectangular energy dissipation plate assembly is connected with the first connecting plate through a sliding support assembly. After the damping system is installed, the rigidity of lost parts of a building can be sequentially enhanced, the situation that the damage to the connecting beam damper part in a certain area is too large, and consequently an anti-seismic defense line is lost is avoided, and the overall structure is more convenient to replace and maintain.
Owner:QINGDAO TECHNOLOGICAL UNIVERSITY

Rat lung injury model for different severity degrees and for achieving induction of different doses of bleomycin through tracheal inside spraying

InactiveCN112189625ASmall non-essential impactThe modeling process is simpleAnimal husbandryTongue rootBiology
The invention provides a rat lung injury model for different severity degrees and for achieving induction of different doses of bleomycin through tracheal inside spraying. The model comprises the following steps that rats are anesthetized, and after the rats reach the anesthetized state, the rats are immediately kept on an inclined face keeping table in a supine manner so that tracheal openings can be found smoothly through oral cavities of the rats; a cold light source is used for irradiating the lower jaws of the necks of the rats so as to obtain sufficient light during subsequent intraoraloperation; the tongues of the rats are pulled out, the tongue roots are pressed by tongue depressors, and the tracheal openings are found; and a tracheal inside atomizer is used, a needle-shaped headof the atomizer is directly inserted into the tracheas of the rats by 3-4 cm, the breathing rule of the rats is observed, bleomycin (10 mg/kg-80 mg/kg weight) of different doses is rapidly sprayed into the tracheas at the moment that the rats inhale, and then the rats are kept on the inclined face keeping table for 5-30 s. By means of the obtained rat lung injury model which is stable, controllable in death rate, better in consistency and capable of simulating different clinical severity degrees, a more reliable animal experiment material is provided for medical preclinical research.
Owner:苏州西山中科药物研究开发有限公司 +1
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