10results about How to "Control damage" patented technology

The application belongs to the technical field of two-dimensional materials, and relates to a method for preparing two-dimensional MXene materials through high-energy electric shock fluorinated salt etching in seconds, which comprises the following steps: 1) after grinding and mixing of a parent phase MAX powder and a fluorinated salt, the mixture is loaded into a quartz tube of a high-energy electric shock device, graphite electrodes are inserted into two ends of the quartz tube, and the material is compacted to be in close contact with the electrodes; 2) after completion of capacitor charging of the high-energy electric shock device, a discharge button is opened, high-energy electric shock is performed, the reaction is completed after flash phenomenon occurs, fluorinated salt is supplemented, and electric shock is repeated for 2-3 times; 3) the product after electric shock is ground and washed with acid, and after washing with deionized water until neutral, standing or centrifugal layering is performed, and the MXene two-dimensional material is obtained from the upper layer. Through high-energy electric shock, the reaction is completed in an instant, the comprehensive energy consumption is lower, and the etching efficiency is faster, and due to fast reaction time, high-temperature oxidation of the MXene can be effectively inhibited, and the application prospect is better.

The present invention discloses a blasting method and a charging device and an explosive bag structure for reducing damage to pipe shed support, belonging to the technical field of tunnel blasting construction, including: setting a pre-splitting zone near the bottom of the pipe shed on the face, setting a plurality of blastholes on the pre-splitting zone, and detonating the explosives after filling the blastholes with explosives; then setting a plurality of blastholes near the bottom of the pre-splitting zone on the face, and detonating the explosives after filling the blastholes with explosives; then setting a plurality of blastholes on the blasting surface between the middle of the face and the bottom of the pre-splitting zone, and detonating the explosives after filling the blastholes with explosives; then setting a plurality of blastholes near the bottom of the face below the middle of the face, and detonating the explosives after filling the blastholes with explosives. This scheme adopts the scheme of pre-splitting and polishing blasting, and can perform pre-splitting blasting below the pipe shed before slotting blasting to form pre-cracks, reduce the propagation of slotting blasting vibration, and thus reduce damage to the pipe shed.

The invention relates to an assembly type transverse straining beam double-column type pier based on U-shaped metal dampers and an installation method, and belongs to the technical field of bridge engineering seismic mitigation and isolation. Comprising a bent cap, a bearing platform and a pier stud between the bent cap and the bearing platform, and further comprises a pier stud embedded part, a rigid transverse straining beam and a U-shaped metal damper. The rigid cross tie beam is arranged at a proper height between the two pier columns through the pier column embedded parts; wherein the U-shaped metal damper mainly comprises a restraint plate, a U-shaped metal plate and a bolt; the rigid cross tie beam is cut off at the midspan position, and the U-shaped metal damper is arranged at the cut-off position. Restraining plates are fixed to the two sides of the cut-off position of the midspan position of the rigid transverse straining beam. The U-shaped metal plate is connected with the restraining plate through a bolt; according to the invention, the energy dissipation capacity is stable, the function of rapid repair and replacement after an earthquake can be realized, prefabrication and assembly can be realized, and the site construction time is greatly reduced.

A power contactor (100) comprises: a fixed part; a movable part capable of contacting the fixed part and moving between an open position and a closed position of the contactor, the movable part comprising at least one power contact (110); an auxiliary contact (120) and a pyrotechnic actuator (130), the auxiliary contact and the pyrotechnic actuator being placed in parallel with the power contact, and the pyrotechnic actuator being configured to be triggered during suspension of the contactor to move the contactor into the open position; and a motor configured to actuate the movable part and bring the movable part into contact with the fixed part, characterized in that the power contact and the auxiliary contact are asynchronous in that when the contactor is closed, the power contact contacts the fixed part before the auxiliary contact, and when the contactor is opened, the auxiliary contact opens before the power contact.

The present invention relates to novel tomato plants having improved resistance to lesion forming pathogens due to reduced Pub17 protein levels, activity or expression. The level, activity, or expression of the Pub17 protein can be reduced by modifying the Pub17 allele to contain an SNP identified to be associated with increased lesion forming pathogen resistance. The invention further relates to plant parts and seeds derived from said tomato plant, and to methods of making said tomato plant or increasing the resistance of a tomato plant to lesion-forming pathogens, as well as to the use of an SNP as a marker and related kits.

The present invention discloses a straw injection molding traction mechanism and a conveying system, and relates to the technical field of traction and conveying of straw production, comprising a frame, wherein a first crawler traction mechanism and a second crawler traction mechanism are arranged in the frame, a traction and conveying space is formed between the first crawler traction mechanism and the second crawler traction mechanism, and further comprising: a plurality of groups of traction and conveying components, each group of the traction and conveying components comprising two strip frames, wherein the strip frames are arranged in the traction and conveying space. In the present invention, when the first crawler traction mechanism and the second crawler traction mechanism squeeze and pull the straw, the guide conveying parts on the strip frames on both sides of the straw support both sides of the straw, limit the damage caused by excessive extrusion deformation of the straw, improve the circumferential deformation strength of the straw, and increase the pressure of compressive deformation of the straw, so that the first crawler traction mechanism and the second crawler traction mechanism can increase the pressure between the straw and the second crawler traction mechanism to meet the friction traction and conveying requirements, thereby improving the accuracy of traction and conveying.

The invention belongs to the technical field of medicines, and particularly discloses application of targeted mesenchymal stem cell NAT10 and RNA acetylation in inflammatory diseases. The invention reveals for the first time that NAT10 mediated ac4C modification is a key positive regulatory factor for regulating the immune function of mesenchymal stem cells (MSC), and an inflammatory environment can inhibit the pathway so as to cause weakening of the MSC function. Based on the discovery, NAT10 expression in the MSC is up-regulated through a genetic means, and the MSC with the enhanced function is prepared. The cell shows a higher ac4C acetylation level, and the expression of key immunosuppressive factors iNOS and COX2 and the secretion of products NO and PGE2 are remarkably improved, so that a stronger T cell inhibition capability is obtained. Animal experiments show that the MSC with the enhanced function shows a remarkably superior treatment effect compared with common MSC in disease models of inflammatory liver injury, periodontitis and the like.

The utility model relates to the technical field of mixing plant additive metering systems, in particular to a mixing plant additive metering system which comprises a metering hopper, a protection structure is arranged below the metering hopper, the protection structure comprises a pneumatic butterfly valve, the pneumatic butterfly valve is arranged at the bottom end of the metering hopper, a pneumatic execution element is arranged in the pneumatic butterfly valve, and the pneumatic execution element is connected with the metering hopper. And two groups of protection screw rods are mounted on two sides of the measuring hopper sensor. According to the additive metering system of the mixing plant, the sensor can be protected by the protection lead screw, damage in the moving process is avoided, the protection lead screw can limit shaking of the metering hopper, the metering hopper is made to be static rapidly, the purpose of rapid metering is achieved, and practicability and efficiency of the device are improved.

A housing of a low-pressure compressor of an aircraft turbine engine is disclosed, said housing (1) comprising an annular wall (4) extending along a longitudinal axis of the housing (1), the annular wall (4) having a first annular section (7) intended to be positioned in unison with a rotor stage (10) of the compressor and a second annular section (9) intended to be positioned in unison with a stator stage (12) of the compressor, the first section (7) and the second section (9) are different from each other.