136 results about "Diffusion velocity" patented technology

The present invention relates to a DICOM image blood flow analysis system. The DICOM image blood flow analysis system comprises: a DICOM file reading and playing module configured to open one or more than one DICOM files to display continuous multi-frame images; a morphology transformation module configured to perform preprocessing of the DICOM files; a blood vessel area extraction module configured to extract the main body of the blood vessel radiography based on a DBSCAN cluster algorithm and extract the fine marginal portion of the blood vessel radiography through multi-scale Gabor filtering; a blood vessel central axis extraction module configured to fuse the context information to perform blood vessel enhancement based on the extracted blood vessel area, extract a partial extreme point to act as a blood vessel central axis and remove partial spurious central axis and find out a communication component so as to complete the central axis extraction through a central axis tracking morphological method; and a calculation module configured to analyze each frame of radiography liquid expansion area and calculate the average diffusion speed and instantaneous diffusion speed of the radiography liquid. The DICOM image blood flow analysis system is able to analyze the contrast agent expansion speed in a blood vessel in real time.

The invention relates to a low steady-speed radial flow clean room air-conditioning air supply and return system which comprises a radial flow air supply channel device, a wall-mounted air return channel device, an air-conditioning outlet static pressure box, an air-conditioning air return port static pressure box and an air-conditioning fresh air port filtering device, the radial flow air supply channel device comprises a clean room roof, a static pressure box type air supply channel, a pressure equalizing partition plate, an arc-shaped radial flow cover, a damping layer and a high efficiency filter bank, and the wall-mounted air return channel device comprises a sandwich wall type air return duct and a filtering device mounted at an air return port of the lower end of the sandwich wall type air return duct. The air supply and return system has the advantages that the operation resistance of the air supply and return system is reduced, the diffusion speed of harmful suspended particles in a clean room is the lowest, fewer high efficiency filter banks are used, the clean room is low in construction investment, energy-saving in operation and convenient to maintain, the air cleanliness class of the clean room is improved by more than 30% as compared with that of a mixed airflow clean room, clean time can be shortened by more than 40%, and airflow in the clean room is reasonably distributed.

Disclosed is a method for fabricating a transistor of a semiconductor device, the method comprising the steps of: providing a semiconductor; forming a gate electrode; performing a low-density ion implantation process with respect to the substrate, thereby forming an LDD ion implantation layer; forming an insulation spacer on a sidewall of the gate electrode; forming a diffusion barrier; performing a high-density ion implantation process with respect to the substrate, thereby forming a source / drain; performing a first thermal treatment process with respect to a resultant structure, so as to activate impurities in the source / drain, and simultaneously causing a diffusion velocity of the impurities in the source / drain to be reduced by the diffusion barrier; and forming a salicide layer.

The invention provides a heavy oil reservoir dissolved gas drive numerical simulation method with a bubble oil phenomenon. The method comprises the following steps: in a microscopic view, establishing a mathematical model for describing a bubble nucleation and growth principle; on the basis, deducing a diffusion speed equation of gas from dissolved gas to bubbles; establishing a three-dimensional two-phase multi-component dissolved gas drive mathematical model; combining a finite difference method and an implicit pressure-explicit saturation (IMPES) method to solve; determining the saturation degree, the dissolved gas-oil ratio, the oil yield and the gas yield of oil reservoir pressure, an oil phase and a gas phase; and then, taking heavy oil reservoir dissolved gas drive experiments with the bubble oil phenomenon as evidences and determining uncertain parameters of the model through an experiment fitting method; and finally, revealing a development effect parameter influence principle through the fitted mode, understanding the bubble oil phenomenon, predicating the productivity of an oil field and formulating a development strategy to improve a heavy oil reservoir recovery ratio with the bubble oil phenomenon.

The invention relates to a high-magnification thermoplastic polyurethane microporous foamed plate which is prepared from the following components in parts by weight: 70-100 parts of TPU (thermoplastic polyurethane) and 0-30 parts of polydimethylsiloxane. The high-magnification thermoplastic polyurethane microporous foamed plate has the advantages that, as a supercutical fluid has relative high solubility in the polydimethylsiloxane and the polydimethylsiloxane has relatively low interfacial tension, a little polydimethylsiloxane mixed in the TPU greatly accelerates the diffusion velocity of the supercutical fluid in the TPU; a diffusion equilibrium time of the supercutical fluid in the TPU is shortened; the volume of a die cavity is slightly more than that of a TPU plate; moreover, a die made of a breathable metal material is laid on a surface of a die, so that the supercutical fluid can synchronously diffuse to enter the TPU plate through the upper surface and the lower surface of the TPU plate; in comparison with that the supercutical fluid can diffuse to enter the TPU plate through the upper surface only, a diffusion distance is shortened; the diffusion equilibrium time is shortened; the production efficiency is improved; in addition, the invention also provides a production method of the high-magnification thermoplastic polyurethane microporous foamed plate.

The invention discloses a method for preparing a lithium ion battery porous electrode based on a 3D printing technology. Lithium iron phosphate and manganese oxide are used as raw materials to prepare printing ink; by a 3D printing technology, a miniature injection print head is adopted to prepare a cathode and anode interdigital structure by using lithium iron phosphate as a cathode material and manganese oxide as an anode material; under argon protection, heat treatment is carried out to obtain an interdigital lithium ion battery structure by using porous lithium iron phosphate as a cathode material and porous manganese oxide as an anode material; and the interdigital lithium ion battery structure is transferred to a glove box for packaging so as to finally obtain the cathode and anode interdigital lithium ion battery. The preparation method is novel, and the technology is simple, accurate and controllable. The prepared material has large specific surface area, and specific capacity and energy density of the battery are greatly raised in comparison with those of a previous planar lithium ion battery. In addition, diffusion velocity of the lithium ion battery is improved by the porous structure of the cathode and anode materials, and the lithium ion battery is endowed with high ionic and electronic conductivity.

The invention discloses a method for improving distribution uniformity of a reinforced phase in a silver metal oxide electric contact material. A reinforced phase element is prepared into powder, a powder spraying device sprays the reinforced phase element powder into a silver solution through inert gas, vacancy concentration of the reinforced phase element is improved, the relative motion velocity of the reinforced phase element and the silver solution is increased, melting and diffusion velocities of the reinforced phase element in the silver solution can be increased effectively, and distribution uniformity of the reinforced phase in the silver substrate in the silver metal oxide electric contact material is finally improved. The technology can be applied to the production process of all silver metal oxide electric contact materials adopting internal oxidation technology or atomization technology, compared with the traditional internal oxidation technology and atomization technology, the method can significantly shorten uniformization time of the silver alloy smelting process, the volatilization amount of the low-melting-point reinforced phase element in the smelting process isreduced, and environment protection treatment cost is lowered.

The present invention relates to an amorphous anode active material, a preparation method of an electrode using the same, a secondary battery containing the same, and a hybrid capacitor, wherein the amorphous anode active material according to the present invention comprises at least one of a metal oxide or a metal phosphate, and the metal oxide or the metal phosphate is amorphous. The metal oxide has the form of MOX (0 < X <= 3), wherein M is at least one of molybdenum (Mo), vanadium (V), scandium (Sc), titanium (Ti), chromium (Cr), yttrium (Y), zirconium (Zr), niobium (Nb) and tungsten (W).; The metal phosphate has the form of AxBy(PO4) (0 <= x =< 2, 0 < y <= 2), wherein A is at least one of lithium (Li), sodium (Na) and potassium (K), and B is at least one of molybdenum (Mo), vanadium (V), scandium (Sc), titanium (Ti), chromium (Cr), yttrium (Y), zirconium (Zr), niobium (Nb) and tungsten (W).; According to the present invention, the storage space of lithium, sodium, and the like and the diffusion velocity of ions thereof are increased by using an amorphous metal oxide or phosphate as an anode active material, thereby remarkably improving the capacity and velocity characteristics of a battery, the charged and discharged state of a finished battery is easily tracked or predicted because a charge / discharge voltage curve having a slope close to a straight line is shown, and compatibility with an anode of a lithium secondary battery, a sodium secondary battery and a hybrid capacitor is expected to be very high because an excellent cycle lifetime is shown.

The invention discloses a method for improving the diffusion uniformity of a crystalline silicon solar cell. Silicon dioxide with thickness from 1 nm to 20 nm grows on a texturing surface of a silicon wafer after texturing through an actinic ozone generation device. The thickness of the silicon dioxide is greater than the thickness of silicon dioxide formed at a pre-oxidation step of the diffusion technology. The silicon dioxide is good in uniformity and compactness. In the subsequent diffusion process, the diffusion velocity of phosphorus in the silicon dioxide is less than the diffusion velocity of the phosphorus in silicon. An oxide-film achieves a buffering effect for reaction, thereby facilitating the uniform diffusion of phosphorus into the silicon wafer, enabling the diffusion uniformity of the phosphorus to be improved, and improving the conversion efficiency of the solar cell to some extent.

The invention discloses a device and a method of measuring an infiltration performance of a porous metal material on the basis of digital image processing. In the invention, a diffusion process of a drop on the porous metal material by a super depth microscope is recorded, and then the monitored record is processed to quantitatively obtain drop diffusion edge and diffusion speed. When the drop is diffused on the porous metal material, the image pixels of a diffusion zone image is changed through comparison with a background image, so that the drop diffusion process and the drop diffusion zone edge are accurately obtained through the digital image processing and further drop diffusion diameter and drop diffusion rate are quantitatively calculated, thereby solving a problem that the drop diffusion zone edge is fuzzy and is difficult to position in a liquid dropping observation method. The device and the method are especially suitable for diffusion of a transparent liquid work medium and provide reliable measurement of testing and evaluating the infiltration performance of the porous metal material. The method also can be developed and used in the fields of tests of infiltration performances of other porous medium materials.

According to the present invention, when a nitridation process by plasma generated by a microwave is applied to a substrate with an oxide film having been formed thereon to form an oxynitride film, the microwave is intermittently supplied. By the intermittent supply of the microwave, ion bombardment is reduced in accordance with a decrease in electron temperature, and a diffusion velocity of nitride species in the oxide film lowers, which as a result makes it possible to prevent nitrogen from concentrating in a substrate-side interface of an oxynitride film to increase the nitrogen concentration therein. Consequently, it is possible to improve quality of the oxynitride film, resulting in a reduced leakage current, an improved operating speed, and improved NBTI resistance.