4results about How to "Reduce stress shock" patented technology

A self-adaptive pressure-bearing energy-absorbing upward drift filling method based on intelligent monitoring and early warning comprises the steps that rock masses are classified according to the crushing degree of the rock masses, and grouting parameters are selected; a plurality of advanced spindle type grouting guide pipes are driven into one section of the periphery of the hanging wall loose rock mass; high-pressure grouting operation is conducted, and a grout anchoring area with the thickness being 1 m is formed; after smooth blasting operation, single-time lagging supporting is carried out, and multiple times of lagging supporting are sequentially carried out on the rear portion at the interval of 0.6 m along with the excavation progress; when the top is pressed, the wear-resistant gasket is used for achieving first-stage energy absorption, the energy absorption material is used for achieving second-stage energy absorption, deformation pressure sensing is conducted through the intelligent sensor, and early warning reminding is conducted through the monitoring terminal; dismounting and recovering the top protection type U-shaped steel and the wall protection type U-shaped steel; and filling and supporting the mined straight wall arch roadway by using the tail mortar. The method has high pertinence for stoping of the hanging wall surrounding rock broken thin vein and has the advantages that supporting is asymmetric, materials can be recycled, intelligent monitoring is achieved, and the supporting strength is self-adaptive.

This invention relates to the field of power engineering technology and discloses an offshore wind power DC transmission system and its operation method and apparatus. The system includes an offshore station, an onshore station, and a DC submarine cable. The offshore station has two independent AC buses: a first AC bus and a second AC bus. The offshore station also includes a first converter branch, a second converter branch, and a first MMC converter valve. The onshore station has a second MMC converter valve, which is connected to the first and second converter branches via the DC submarine cable. This invention designs two independent AC buses connected to the wind farm group respectively, with the two converter branches sharing the first MMC converter valve and serving as backups for each other. The dual buses reduce electrical coupling between wind farms; in the event of a fault, only the wind farm connected to a single bus is affected, and the short-circuit current is reduced due to weakened impedance coupling. The shared core equipment between the two converter branches reduces hardware costs, and the backup design prevents system outages caused by single-branch faults.

The invention relates to a miniature light-emitting device and a preparation method thereof, the device comprises a light-emitting structure, the light-emitting structure comprises an epitaxial layer and a first bonding metal layer which are stacked in sequence, a first opening is formed in the first bonding metal layer, and the first opening is filled with a self-repairing material; the self-repairing material is a material which is reduced into metal in an environment with a preset temperature; the driving structure comprises a driving substrate and a second bonding metal layer which are sequentially stacked, a second opening is formed in the second bonding metal layer, the second opening is filled with a self-repairing material, and the second bonding metal layer faces the first bonding metal layer and is bonded with the first bonding metal layer.

The invention discloses a honeycomb-shaped flexible thermoelectric power generation sheet. A plurality of hexagonal holes are distributed in a flexible substrate of the thermoelectric power generation sheet at intervals; at least one N / P type thermoelectric semiconductor is fixedly mounted in each hexagonal hole; the cold end of the N / P type thermoelectric semiconductor is flush with the upper end face of the flexible substrate, and the hot end is flush with the lower end face of the flexible substrate. Each hexagonal hole and an N / P type thermoelectric semiconductor arranged in the hexagonal hole form a honeycomb structure; the N / P type thermoelectric semiconductors are sequentially connected in series according to the N-P-N-P sequence, the two hot ends are connected through a conducting strip, and the two cold ends are connected through a wire. The conducting strip is formed by solidifying a conducting solution. The honeycomb-shaped flexible thermoelectric power generation sheet is inspired by a natural honeycomb-shaped structure, adopts a structure that the N / P type thermoelectric semiconductor is wrapped in the flexible substrate, provides stronger flexibility through the flexible substrate, has the power generation advantage of a rigid semiconductor, and realizes efficient capture of heat energy in the environment.