2results about How to "Small repeatability error" patented technology

The invention discloses a biochar purification process, and relates to the technical field of biochar preparation, biochar raw materials are screened, impurity particles with the particle size larger than 50 meshes are removed, and the moisture content of the screened raw materials is controlled to be smaller than or equal to 15%; putting the pretreated raw material into a nitric acid solution with the concentration of 0.1-0.5 mol / L, stirring and dipping at 50-70 DEG C for 1-3 hours, and then washing with deionized water until the raw material is neutral; alkali washing treatment: dipping the raw material subjected to acid washing and drying in a potassium hydroxide solution with the concentration of 0.2-0.6 mol / L, stirring and dipping at 40-60 DEG C for 2-4 hours, and washing with deionized water again until the raw material is neutral; pyrolyzing and purifying; physical screening; and chemical activation. Compared with the prior art, the invention has the advantages of optimized graded pore structure, high purity, low ash content, improved process stability, energy saving, consumption reduction and environmental protection.

This application relates to the technical field of communication equipment testing and discloses a cavity filter tuning fixture. The fixture includes a test base, a tuning fixing block, and a tuning clamp. The filter under test (DUT) is placed on top of the test base, and the tuning fixing block is mounted on top of the DUT. The tuning fixing block is detachably connected to the test base, and the tuning clamp is movably connected to the bottom of the test base. The tuning fixing block has a first guide hole, and the top interface of the DUT is inserted into the bottom end of the first guide hole. A test cable interface passes through the top end of the first guide hole and connects to the top interface of the DUT. A guide step protrudes from the top of the test base, and the guide step has a second guide hole. The guide step is inserted into the bottom interface of the DUT, and another test cable interface passes through the bottom end of the second guide hole and connects to the bottom interface of the DUT. The tuning clamp engages with the test cable interface. This application enables rapid installation of 5G filters onto the test fixture, saving assembly time and improving production efficiency.