6results about How to "The process is easy to implement" patented technology

The present invention discloses a flexible DC converter valve series module electrical voltage balancing device, including a valve tower waterway and a submodule, the valve tower waterway including a valve tower interlayer horizontal water pipe, a valve tower interlayer vertical water pipe and a valve tower ground vertical water pipe; the submodule's inlet and return water branch pipe is connected in parallel to the valve tower interlayer horizontal water pipe, the valve tower interlayer horizontal water pipe is connected in parallel to the valve tower interlayer vertical water pipe, and the valve tower interlayer vertical water pipe is connected to the valve tower ground vertical water pipe; the valve tower interlayer horizontal water pipe has n layers, the length of the valve tower interlayer vertical water pipe connected in parallel to the first and nth valve tower interlayer horizontal water pipes is L, and the length of the valve tower interlayer vertical water pipe connected in parallel to the 2nd to (n-1)th valve tower interlayer horizontal water pipes is 2L. The flexible DC converter valve series module electrical voltage balancing device provided by the present invention uses the valve tower waterway as a voltage balancing resistor, and further optimizes the electrical voltage balancing characteristics of the valve tower as a whole by controlling the length of the valve tower interlayer vertical water pipe.

The invention discloses an ultralow backscattering extinction device for weak light detection. The center of the end face of one end of the outer shell is provided with a circular inlet used for receiving emergent light beams from a telescope. An inlet shading short cylinder with a visual angle is arranged on the inner side of the circular inlet; more than two groups of light blocking ring assemblies are arranged on the side wall of the cylindrical inner cavity in the closed inner cavity of the outer shell along the optical axis direction; a bottom center cone is arranged in the center of the bottom of an inner cavity of the outer shell, and a conical surface microstructure is arranged on the surface of the bottom center cone; a conical tip trap hole is formed in the conical tip of the bottom center cone in the optical axis direction. The bottom of the conical tip trap hole is provided with a hole bottom inclined absorption surface which is inclined relative to the optical axis and used for enabling light in the hole bottom mirror reflection direction to deviate from the inlet optical axis. The objective of the invention is to solve the problem of measurement of backward stray light generated in the process that an exit pupil of a telescope on a space gravitational wave optical platform emits opposite light.

The present invention provides a concave metal plate unit based on the external hanging of a plane curtain wall. When the plane component-type curtain wall is installed, it directly passes through the interlayer panel from the main structure, and the external hanging has a strong load-bearing capacity and a three-dimensionally adjustable transfer system. The concave perforated metal plate unit is processed and assembled in the factory by various aluminum profile components, modeling metal plates and fasteners, and is integrally hung on the external hanging transfer system on site through a hanging system, and an anti-seismic anti-slip and anti-side sliding device is also provided. The present invention has the advantages of complete and beautiful effect, reasonable structural force, safety and reliability, superior waterproof performance, simple and convenient processing and installation, simple and easy quality precision control, strong adjustability, good replaceability, strong applicability, good economy, etc., and has a good prospect for promotion and application in the field of building curtain walls.

The present invention provides a chain extender and a preparation method thereof and a cast polyurethane, comprising the following steps: adding caprolactone and vacuum dehydrating to obtain dehydrated caprolactone, then transferring to a dropping kettle and keeping it warm at 40°C for standby use, stirring a monoprimary amine ammonia compound in a reactor and heating it to 70°C, then dropping dehydrated caprolactone, keeping the material in the reactor warm at 75°C for 120 minutes after the dropping is completed, and discharging the material to obtain a chain extender. The cast polyurethane product of the present invention has a uniform structure, a long operation time, strong tensile strength, high elongation at break, low compression permanent deformation, etc., giving the cast elastomer excellent comprehensive performance. It is easier to realize the process of large-scale polyurethane products and manufacture large-scale cast polyurethane products.

The invention discloses an optimization method for a release hole structure of a bulk acoustic wave resonator filter. The optimization method comprises the following steps: step 1, adding an auxiliary release structure on the upper surface and / or the lower surface of a release hole position; wherein the lattice mismatch rate of the auxiliary release structure material and the piezoelectric layer material is lower than 5%, the auxiliary release structure is annular, the inner diameter of the auxiliary release structure is not smaller than the center value of the designed diameter of the release hole, and the auxiliary release structure is not in contact with the top electrode or the bottom electrode. Step 2, preparing a release hole: taking silicon oxide as a hard mask, and performing release hole patterning at the position of the release hole to form a vertical release hole; and 3, preparing a cavity: releasing the sacrificial layer material through the release hole, and forming the cavity communicated with the release hole below the bottom electrode. By adding the auxiliary release structure on the surface of the release hole, the overall structural strength of the release hole can be enhanced, the shape and size are easy to control, microdefects around the release hole are avoided, and the yield of the device can be effectively improved.

The present invention provides a method for preparing tembotrione metabolites. The method uses 2-chloro-3-(2,2,2-trifluoroethoxy)methyl-4-methylsulfonylbenzoyl chloride, a key intermediate of tembotrione, as a raw material, and reacts with 1,3-cyclohexanedione compounds to prepare tembotrione metabolites M5 and M10 through three steps of condensation, transposition and hydrolysis. The method has a simple synthetic route and mild operating conditions, and can obtain high-purity tembotrione metabolites with a high yield, which fully meets the sample amount requirement for tembotrione metabolites in pesticide registration.