5 results about "Porous medium" patented technology

The invention discloses a novel design method for ESD protection, which comprises the following steps: (1) forming a well region, a gate oxide layer, gate poly-silicon, a porous medium layer, a source electrode and a grid electrode on a silicon substrate of a DMOS device in order; (2) forming the gate poly-silicon under lead bores of the source electrode and the grid electrode; and (3) forming the gate oxide layer between the gate poly-silicon and the well region, wherein the gate oxide layer is used for isolating the source electrode and the grid electrode when the lead bores of the source electrode and the grid electrode are punched at the position of the gate poly-silicon. The novel design method has the remarkable characteristics of utilizing the same set of MASK to produce products with ESD or without ESD by selecting whether to increase a process for photoetching an ESD layer, so as to save MASK cost and greatly save the production cost of the products.

The invention discloses a simulation method for a hot air drying process of a fungus material, and the method comprises the steps: building a physical model of a porous medium pore channel network ofthe fungus material according to the corresponding relation between the structural composition of the fungus material and the porous medium pore channel network structure; dispersing the fungus material medium calculation area into three parts, namely a skeleton, a pore node and a pore channel; simplifying the topological structure of the model according to the actual material related physical property characteristic parameters; establishing a pore channel network mathematical model for fungus material drying and mass transfer; establishing a fungus material drying heat transfer mathematical model based on a pore network; setting initial conditions and boundary conditions of mass transfer and initial conditions and boundary conditions of heat transfer; and solving the fungus material drying mass and heat transfer mathematical model established in the steps 4 and 5 by adopting a staggered grid. The method can comprehensively consider the heat and mass coupling complex transmission process of moisture between frameworks, between pore channels and between the frameworks and the pore channels in the drying process, and lays a foundation for analysis of the drying mechanism of high-heat-sensitivity and high-activity materials.

The invention discloses an experimental device for studying gas flow characteristics in a porous structure, which relates to the research field of gas flow characteristics in porous media, including an experimental tube group, a gas supply system, a gas storage buffer system, an ultra-low pressure guarantee system and data acquisition The system, in which the experimental tube group provides the arrangement space of porous media of different sizes and the parameter measurement holes, the gas supply system provides a continuous gas atmosphere, the gas storage buffer system provides stable air flow parameters and inlet and outlet pressures, and the ultra-low pressure guarantee system realizes The gas flows in a directional and stable manner in the system, and the data acquisition system realizes the acquisition of target parameters, signal conversion and processing. The invention accurately arranges the effective pores in the micro-scale porous medium, realizes the change of the porosity in a large range, avoids the uncertainty error of the structural parameters in the micro-scale porous medium, and then realizes the micro-scale porous medium under ultra-low pressure. Approximate studies of gas flow properties in scaled porous media.

The invention relates to a novel buffering deceleration strip based on a nanofluidic system; thenovel buffering deceleration strip comprises a deceleration strip shell, a deceleration strip functional area and a solid base, the deceleration strip shell is of a semicircular cylinder structure, the deceleration strip functional area is filled in the deceleration strip shell, and the solid base is arranged at the bottom of the deceleration strip shell. The thickness of the solid base is gradually reduced from the center of the elliptic cylinder to the two sides, the thickness of the center accounts for 1/5 of the total height of the elliptic cylinder, the solid base is installed on a road through expansion screws, and the deceleration strip functional area is a nano-fluidic system composed of hydrophobic nano-porous media and water or glycerin. When a vehicle passes at a low speed, the shape and volume change of the deceleration strip can be automatically adjusted according to the load of the vehicle, so that the purpose of stably passing the vehicle is achieved; when the vehicle is high, the deceleration strip continues to keep large rigidity, the extremely-high resistance effect on wheels is achieved, and the vehicle is forced to be decelerated.

The embodiment of the invention provides a refining furnace and molten zinc refining equipment, and relates to the field of molten metal refining equipment. The refining furnace and the molten zinc refining equipment aims at reducing oxidation ablation of molten metal in the refining process. The refining furnace comprises a sedimentation tank, a refining tank and a porous medium combustor; the sedimentation tank communicates with the refining tank, the porous medium combustor is provided with a flame surface, the porous medium combustor is arranged in the refining tank, and the flame surface faces the interior of the refining tank. The molten zinc refining equipment comprises the refining furnace. The flame surface of the porous medium combustor faces the interior of the refining tank and is used for heating the molten metal in the refining tank. The flame burns in the porous medium, and high-speed flame will not scour the surface of the molten metal, so that the continuous oxidation of the molten metal is reduced, the oxidation ablation of the molten metal is reduced, and the oxidation loss of the molten metal is reduced.