4results about How to "Improved profile" patented technology

This invention relates to a method for constructing a curved solar concentrator with uniform light reception on the absorber surface, belonging to the field of solar photovoltaic and photothermal technology. This invention utilizes differential geometry theory to construct a system of first-order nonlinear differential equations relating the concentrator's reflective surface (x and y coordinates) to the radius r of the circular absorber. The reflective surface profile parameters are obtained through iterative solutions. A discrete point lattice is obtained, with the spatial straight-line distance and maximum deviation between adjacent iteration coordinate points not exceeding 2 mm as the convergence criterion. A curved concentrator model is then generated through spline curve fitting. The energy flux density distribution on the absorber surface is obtained using the ray tracing software Tracepro, and the uniformity of the energy flux distribution is verified using a relative deviation not exceeding ±10% of the average value. This invention achieves uniform distribution of incident solar radiation on the absorber surface, eliminates local hot spots, significantly reduces thermal stress gradients, and improves the photothermal conversion efficiency and operational stability of the solar concentrator system.

This invention relates to the field of oil and gas field fracturing technology, and particularly to an integrated device and method for horizontal well cluster-level fluid extraction, production measurement, and fracturing. The technical solution is as follows: a multi-nozzle pressure-controlled switch jet pump and a first packer are connected to the casing downhole via tubing. Within the horizontal section, a production measurement and fracturing control valve and a water hammer wave monitor are connected via tubing. The production measurement and fracturing control valve and the water hammer wave monitor are located between the second and third packers. The advantages are: by coordinating the multi-nozzle pressure-controlled switch jet pump with the production measurement pump core of the storage-type downhole jet pump, fluid extraction and formation production data can be measured in cluster-level sections of the horizontal well. Furthermore, by moving the positions of the production measurement and fracturing control valve and the water hammer wave monitor, fracturing operations can be performed on the corresponding cluster sections requiring modification. Simultaneously, water hammer wave data can be measured at close range. A single drilling run completes the functions of fluid extraction, production measurement, and fracturing, resulting in low construction costs and high measurement accuracy.

The application discloses a low-profile heavy-load 2R1T parallel platform and belongs to the technical field of parallel robots. The low-profile heavy-load 2R1T parallel platform comprises a static platform, a dynamic platform, three driving branch chains and three constraint branch chains connecting the static platform and the dynamic platform; the lower ends of the three driving branch chains are connected to three connecting points of the static platform through Hooke joints, and the three connecting points form an equilateral triangle; in an initial state, the axes of the three driving branch chains are parallel to each other and are perpendicular to the static platform and the dynamic platform respectively; the three constraint branch chains are distributed in space and are perpendicular to each other and are parallel to three coordinate axes of a Cartesian coordinate system respectively. The three driving branch chains are all in the UPS structure, and the three constraint branch chains are in the SS structure, the variable PUU structure and the SS structure respectively. The low-profile heavy-load 2R1T parallel platform is a parallel mechanism, has the advantages of large bearing capacity, low profile, low gravity center, difficulty in toppling and structural stability, and the mechanism can obtain an analytical solution through establishment of a kinematic equation.

The present invention relates to compounds of formula (i), in which r1, r2 and r3 are as described herein, and their prodrugs or their pharmaceutically acceptable salt, enantiomer or diastereomer of the same, compositions comprising the compounds and methods of using the compounds as tlr7 agonists for the treatment and prophylaxis of viral infections.