7results about How to "Free access" patented technology

This invention discloses a system and method for testing the radio frequency interference (RFI) immunity performance of train vehicle equipment. The system includes a test terminal, a mobile terminal, an adjustable bracket, an antenna, and a field strength probe. The mobile terminal houses a power supply and an immunity signal generator. The power supply powers the test terminal and the immunity signal generator, and the immunity signal generator generates and amplifies the RF modulation signal. The test terminal is located on one side of the top of the mobile terminal. This system and method for testing the RFI immunity performance of train vehicle equipment utilizes a mobile terminal connected to the test terminal, antenna, field strength probe, and immunity signal generator to perform RFI immunity testing. The immunity signal generator simulates the RF interference environment, eliminating the need for an anechoic chamber. Testing can be conducted directly within the train carriages after the train assembly is completed and all functions are properly debugged, improving the overall mobility and portability of the testing system.

The utility model discloses a kind of metal ceramic packaging appearance semiconductor discrete device manual limiting tool, comprising: fixed frame;Two groups of pressing jaw, two groups The pressing jaw is respectively arranged on the two sides of the fixed;Article placing assembly, the article placing assembly is arranged on the fixed frame, the article placing assembly can ascend or descend along vertical direction, and the article placing assembly can be placed with the jig of workpiece;Driving assembly, the driving assembly is arranged in the fixed frame with damping rotation, and is engaged with the article placing assembly transmission, to be suitable for driving the article placing assembly ascending or descending, so that the jig on the article placing assembly is in abutment with two groups The pressing jaw is away from two The pressing jaw;When the driving assembly rotates towards clockwise direction, the article placing assembly ascends along vertical direction, so that jig is in abutment with two groups The pressing jaw, when the driving assembly rotates towards counterclockwise, the article placing assembly descends along vertical direction, so that jig is away from two groups The pressing jaw.

The application discloses a solar water evaporation and adsorption material, a preparation method and application thereof, and belongs to the technical field of wastewater treatment. A polydopamine modified zeolitic imidazolate framework material is stirred and reacted with a pre-oxidized nanocellulose solution and a polyvinyl alcohol solution to form a viscous liquid, the viscous liquid is transferred into a mold, and static bubble removal, freeze forming and freeze drying are sequentially performed, so that a solar water evaporation and adsorption material formed by pre-oxidized nanocellulose and polyvinyl alcohol and loaded with the polydopamine modified zeolitic imidazolate framework material is obtained. The solar water evaporation and adsorption material has the characteristics of high stability, and simultaneously has photo-thermal conversion function and rare earth ion adsorption activity. Solar radiation can be used to promote water evaporation, accelerate the mass transfer of rare earth ions in the aqueous solution and the combination of the adsorption active sites, so that the adsorption kinetics of the rare earth ions is accelerated, and the solar water evaporation and adsorption material can be used for rare earth wastewater treatment, especially low-concentration rare earth wastewater treatment.

The utility model relates to the technical field of strength detection for concrete slabs, and discloses a strength detection device for construction engineering concrete slabs, which comprises a detection box, a motor is arranged above the detection box, the output end of the motor penetrates through the detection box and is fixedly provided with a screw rod, two groups of sliding grooves are arranged at the lower part in the detection box, and the two groups of sliding grooves are arranged in the detection box. The outer portion of the screw rod is in threaded connection with a connecting block and a connecting plate, the connecting block is located above the connecting plate, two sets of fixing columns are fixedly connected to the lower portion of the connecting plate, pressure plates are fixedly connected to the lower portions of the two sets of fixing columns, and protective shells are installed on the peripheries of the lower portions of the pressure plates. A detection head is arranged in the middle of the lower portion of the pressure plate, sliding blocks are connected into the two sets of sliding grooves in a sliding mode, the situation that concrete blocks splash in the detection process can be effectively prevented, concrete plates needing to be detected can be effectively replaced and cleaned, and the practicability of the device is improved.

The invention discloses a porous electrode and a preparation method thereof, the porous electrode comprises a current collector and an active material layer arranged on at least one surface of the current collector, and the active material layer comprises an active material, a binder and an acid etching conductive agent; wherein the acid etching conductive agent comprises an acid etching carbon nano tube or an acid etching carbon fiber; a plurality of holes are formed in the tube wall of the acid etching conductive agent, the hole diameter of each hole is 1-5 nm, and the porosity of the tube wall is 60-70%. Compared with the prior art, the porous electrode provided by the invention uses the acid etching conductive agent, so that the pores of the porous electrode are stable and are not easy to disappear, the manufacturing process is simple, the cost is relatively low, the ion transmission capability of the pole piece in the longitudinal direction can be improved, and meanwhile, the ion transmission in the transverse direction is also promoted; the distribution of alkali metal ions in the pole piece is more uniform, and the risk of metal precipitation on the surface of the pole piece is reduced, so that the fast charging performance of the secondary battery is improved.

The utility model relates to access control device technical field, concretely is a kind of multifunctional access control device, including frame, the frame one end is connected with rotary door by rotating rod, rotating rod one end is fixedly installed with driving device, the driving device lower end is fixedly installed with carousel, the carousel rotation is connected with base;When staff opens driving device, rotating rod can be driven to rotate, to drive rotary door fixedly connected with rotating rod to rotate and open, and then personnel can freely enter and exit, when driving device fails, staff can manually pull handle, carousel can be driven to rotate, to drive driving device fixedly connected with carousel to rotate, and then rotating rod fixedly connected with driving device can be driven to rotate, and then rotary door fixedly connected with rotating rod can be rotated and opened, avoid when driving device fails, the influence caused to personnel's entry and exit.

The present application relates to the technical field of textiles, in particular to an antibacterial fabric based on graphene-polyamide composite fiber and a production process thereof. The present application overcomes the problem of poor antibacterial performance and durability of the antibacterial fabric. In the present application, modified graphene, Ag / ZnO nanoparticles and polyamide masterbatch are melt-extruded to obtain modified polyamide fibers; composite ultraviolet-resistant agent, modified antioxidant, modified moisture-absorbing agent and polyester masterbatch are melt-extruded to obtain modified polyester fibers; finally, the modified polyamide fibers, the modified polyester fibers, cotton fibers and bamboo fibers are mixed, twisted, heat-set and blended to obtain the antibacterial fabric. In the present application, the modified graphene and the Ag / ZnO nanoparticles can synergistically improve the antibacterial performance of the antibacterial fabric; the polyamide masterbatch, the polyester masterbatch and the cotton fibers can jointly improve the mechanical properties of the antibacterial fabric; the composite ultraviolet-resistant agent, the modified antioxidant, the modified moisture-absorbing agent and the bamboo fibers can improve the ultraviolet resistance and moisture-absorbing and air-permeability of the antibacterial fabric.