84 results about "Degradation phenomenon" patented technology

The invention discloses a method for improving light degradation of a boron-doped crystalline silicon solar cell. The method comprises the following steps: heating a solar cell to enable the temperature to reach a first temperature and keeping constant temperature for a first preset time; electrifying the solar cell at constant temperature with preset current; electrifying for a second preset time; cooling the solar cell under electrifying state and reducing the temperature to be below the second temperature; after heating and performing constant temperature treatment on the solar cell, electrifying, combining boron atom and oxygen atom in the solar cell into a B-O pair, and combining with hydrogen atom in the surface film and forming into an H-B-O pair; generating the H-B-O pair to enable the B-O pair to deactivate. After the treatment according to the method provided by the invention, the B-O pair complex in the solar cell is reduced, so that the light degradation amplitude is reduced and the light degradation phenomenon of the boron-doped crystalline silicon solar cell can be effectively improved.

The invention discloses a maintenance and spare part supply combined optimization method based on a deterministic inventory degradation model. The maintenance and spare part supply combined optimization method based on the deterministic inventory degradation model comprises the steps of selecting and fitting out the deterministic inventory degradation model according to inventory degradation data, introducing the deterministic inventory degradation model, computing the expected maintenance expense, the expected spare part purchasing expense, the expected spare part storage expense and the expected spare part shortage loss expense, building a maintenance and spare part supply combined optimization model according to the deterministic inventory degradation model, and carrying out optimization solution. The method takes the spare part inventory degradation phenomenon which is ignored but very important in the maintenance optimization process into account, and combines the historical inventory storage degradation data to obtain the deterministic inventory degradation model which describes the spare part inventory degradation phenomenon. Meanwhile, the deterministic inventory degradation model is introduced into the computation of the maintenance and spare part supply related expenses, the combined optimization model is built more reasonably, the combined optimization model is more suitable for the practical situation than an original model, and a more accurate result can be obtained.

The invention relates to a stroke width figure based method for extracting Chinese character data from an image. The method comprises the steps of reading a colored image; clustering colors by the mean clustering algorithm to obtain a first binary image sequence; performing the edge detection algorithm and the morphological connected domain analysis method to obtain a second binary image sequence; filtering the combined sequence for the first time through a geometric filter to obtain a third binary image sequence; calculating a stroke width figure of the third binary image sequence; filtering the third binary image sequence for the second time according to the stroke width figure to obtain a fourth binary image sequence; overlapping all images in the fourth binary image sequence to obtain an extracted character result. Compared with the prior art, the method has the advantages that the distance of the color clustering algorithm can be adaptively selected by determining the image brightness value; the non-uniform illumination and other degradation phenomenon can be treated well; the traditional stroke width calculation method is improved to improve the performance of the character extracting technology.

The invention discloses a preparation method of a gallium-doped polycrystalline silicon ingot. The preparation method comprises the following steps: (1) forming a silicon nitride coating on the inner wall of a crucible; (2) putting the polycrystalline silicon material and a gallium dopant in the crucible to obtain a mixture; (3) putting the crucible filled with the mixture into an ingot furnace, vacuumizing, and heating so that the mixture is gradually melted from top to bottom; (4) at the crystal growth stage, adjusting the temperature of a temperature control thermocouple in the ingot furnace and the upward moving rate of a side thermal insulating cage so that heat radiates downwards and consequently, and the molten silicon grows from bottom to top under a vertically upward temperature gradient; (5) annealing and cooling, thereby obtaining the gallium-doped polycrystalline silicon ingot. Experiments prove that the polycrystalline silicon ingot is long in minority carrier lifetime and low in dislocation density, a polycrystalline silicon solar cell prepared from the polycrystalline silicon ingot is capable of obtaining relatively high photoelectric conversion efficiency, and more importantly, the cell prepared from the polycrystalline silicon is free of light-induced degradation phenomenon.

The invention relates to a water-in-oil emulsion explosive, which is characterized in that the explosive contains ethylene vinyl acetate copolymer, has good storage stability, and is not easy to produce explosives even if it is stored under a load for a long period of one year. Phenomenon of performance degradation and curing, only slight, easily disintegrating curing occurs partially, and is also very suitable for water since it can be filled with a filling machine even after long-term storage and has good water resistance hole blasting.

A method of storing a metal lanthanum sputtering target, wherein a surface of a metal lanthanum target to be stored is processed so as to achieve a roughness Ra of 1 μm or less, a lanthanum fluoride coating is formed on the surface thereof, the metal lanthanum target to which the lanthanum fluoride coating was formed is subsequently charged in a vacuum pack with an oxygen transmission rate of 0.1 cm3 / m2 per 24 h at 1 atm or less and a moisture vapor transmission rate of 0.1 g / m2 per 24 h or less, and the vacuum pack is thereafter subject to vacuum suction and sealing for storage. This invention aims to provide technology for enabling the long-term storage of a sputtering target in a usable state by devising the method of storing a metal lanthanum target as a rare earth metal, and thereby inhibiting the degradation phenomenon caused by the oxidation of the target due to residual air or the inclusion of air.

The invention provides a landfill type electrode structure suitable for a surface acoustic wave device. The landfill type electrode structure comprises a substrate, a groove and an electrode, whereinthe groove is formed in the surface of the substrate, and the electrode is arranged in the groove. The landfill type electrode structure provided by the invention can improve the degradation phenomenon of the metal film electrode at a high temperature, so that the stable working time of the electrode under a high temperature condition is prolonged; according to the landfill type electrode structure, the reflection coefficient and the electromechanical coupling coefficient of the surface acoustic wave device can be improved, the size of the surface acoustic wave device is reduced, and the bandwidth of the device is increased; for a surface acoustic wave device applied to pressure sensing, the landfill type electrode structure provided by the invention can increase the frequency pressure coefficient and improve the pressure sensitivity.

Disclosed is a sharpness improvement apparatus of an image signal which improves a sharpness of an analogue image signal so as to display a clear image. A display device which displays an inputted image signal on a screen can display a clear image with a digital sharpness improvement apparatus which realizes a sharpness of the image signal into a digital method by improving a degradation phenomenon of a signal generated at an analogue image processing into a simple digital circuit.

Disclosed is a high-efficient and quick cultivation technique for gastrodia elata. After low-temperature 'dormancy' treatment is conducted on selected and remained gastrodia seeds, the selected and remained gastrodia seeds are cultivated according to a conventional method, and the degradation phenomenon in the process of artificial cultivation can be avoided. The concrete scheme includes the following steps: placing the gastrodia seeds in an environment with the temperature of 6 to minus 8 DEG C, like a refrigerating chamber of a common refrigerator, for dormancy for 7 to 28 days; or placing the gastrodia seeds in a ventilated environment with the temperature of 3 to 8 DEG C for 15 to 20 days. A worker had better cover the gastrodia seeds with wet sand during the period of the dormancy to avoid excessive water evaporation. The high-efficient and quick cultivation technique for the gastrodia elata is simple and easy to master and popularize, and the serious degradation phenomenon in the process of the artificial cultivation is effectively avoided. A gastrodia elata yield is greatly improved by more than two times compared to cultivated gastrodia elata which do not undergo the dormancy treatment, the gastrodia elata is good in quality, large in size, fine in color, free of pest disease damage, the weight of the largest gastrodia elata is 325 grams, and successive high yield can be achieved. Therefore, the high-efficient and quick cultivation technique for the gastrodia elata provides an ideal method for gastrodia elata high-yield cultivation and suitable for gastrodia elata cultivation in civil air-defense fortifications, indoor sites or other places.