39results about How to "Reduce cracking rate" patented technology

The invention discloses a watermelon plastic film full-mulching cultivation method. The watermelon plastic film full-mulching cultivation method comprises a first step of preparing a land and sowing laguminosae, a second step of evening the laguminosae, a third step of conducting irrigation and covering plastic film, and a fourth step of growing watermelon seedlings and conducting filed management. According to the watermelon plastic film full-mulching cultivation method, due to the fact that the land is fully covered by the two-color plastic film, the two-color plastic film has the effects of restraining weeds and avoiding aphids, the aphids and other insects are effectively prevented from spreading diseases, the land temperature inside a ridge is rapidly improved, and effective degradation of green manure plants is improved. Due to the fact that quick lime is applied, soil acidification can be effectively relieved, the calcium content of soil can be increased, and the rate of watermelon cracking in the watermelon mature period is reduced. Due to the fact that a layer of dry straw covers the plastic film arranged between every two ridges, moistures is absorbed, the dryness degree inside a green house is improved, fixation of watermelon vines is facilitated, and watermelon growth is facilitated. The incidence of fusarium wilt is reduced by 96% compared with that of the prior art. The quality of watermelons is remarkably improved. The sugar degree of each watermelon is increased by 1%-3%. The yield is increased by 200%-600% compared with that of the prior art.

The invention discloses a preparation method for a back electrode of a solar battery. The preparation method includes that using soldering flux to form a soldering flux belt at the surface of an aluminum back field, forming a non-silver metal solder belt at the surface of the soldering flux belt, wherein the soldering flux belt can break an alumina film at the surface of the aluminum back field to expose fresh aluminum from the surface of the aluminum back field, the subsequently fed non-silver metal wires (solder) are melted by the heat effect of a soldering head, the molten liquid fuses with the aluminum, the molten solder is well bonded at the surface of the aluminum back field, the silver use is avoided, the cost is lowered, an ultrasonic vibration device is not used, the intensity of a finished product is obviously improved, fragment and crack are obviously reduced, and the quality of the back electrode of the solar battery is greatly improved. The back electrode of the solar battery prepared by the preparation method is low in fragment and crack rate, the adhesion between the back electrode and aluminum back field is strong, the welding with a photovoltaic soldering belt is good, the average photoelectric efficiency conforms to requirement, and the manufacturing cost is low.

The invention discloses a variable water ratio control method of the secondary cooling of a billet caster which can reduce the inner crack rate of casting blanks. The control method can realize that the water flow rate delta and the total amount of water Q increase by stages with the increasing of the casting speed V of casting blanks, namely when the casting speed V of casting blanks is 0-2m / min, the water flow rate delta is 1.35-1.39L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 13.8-14.3V; when the casting speed V of casting blanks is 2-2.4m / min, the water flow rate delta is 1.58-1.64L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 16.2-16.8V; when the casting speed V of casting blanks is 2.4-2.8m / min, the water flow rate delta is 1.67-1.71L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 17.1-17.5V; when the casting speed V of casting blanks is 2.8-3.0m / min, the water flow rate delta is 1.73-1.76L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 17.7-18.1V; and when the casting speed V of casting blanks is 3.0-3.6m / min, the water flow rate delta is 1.8-1.86L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 18.5-19.1V.

The invention provides a curing agent for making bricks after curing water-based drilling cuttings as well as a preparation method and application of curing agent. The invention relates to the technical field of environment-friendly treating of oil field water-based drilling cuttings. The curing agent comprises 2%-5% of a solid surfactant, 30%-50% of industrial waste residues, 30%-50% of cement, 5%-10% of plant shell and 3%-5% of inorganic salt. According to the curing agent, the industrial waste residues such as coal gangue and the like are used, waste is treated with waste, the plant shell and the solid surfactant are introduced, the problems that the sintered brick prepared from the cured water-based drilling cuttings is prone to crisping, high in moisture content, adhesive and the likeare solved, the cured water-based drilling cuttings can be recycled to be used for preparing the sintered brick, and the practical value and the popularization prospect are achieved.

The invention provides a seedless watermelon anti-dehiscence method. According to the anti-dehiscence method, after a seedless watermelon grows to a fruit swelling period, a seedless watermelon anti-dehiscence agent is sprayed. The anti-dehiscence agent is prepared from ammonium molybdate, pectin, xylanase, calcium superphosphate, serine protease, astragalus polysaccharide and water. By the adoption of the seedless watermelon anti-dehiscence method, the fruit dehiscence rate of the planted seedless watermelon is lowered to 3.07-9.39%o.

The invention provides an adhesion method for a crystal bar. The method comprises the steps that before the adhesion of the crystal bar and a bearing plate, adhesives are applied on the crystal bar in advance to form an adhesive layer, and after the adhesive is solidified, adhesion is conducted on the crystal bar with the adhesive layer and the bearing plate by applying the adhesive for a second time. The adhesion method for the crystal bar is simple and efficient, cracks on the adhesive surface of the crystal bar can be reduced, adverse effects caused by the empty adhesive phenomenon are eliminated, the breakage and hidden crack rate in silicon wafer cutting process is further reduced, and the yield of silicon wafers is improved.

The invention provides a heat-dissipating packaging adhesive film and a preparation method thereof. The heat-dissipating encapsulation adhesive film includes a base resin, a phase-change material / heat-conducting filler compound, an initiator and a cross-linking agent dispersed in the base resin. The invention effectively solves the problem that the heat dissipation packaging method of solar photovoltaic modules in the prior art cannot simultaneously take into account heat dissipation, cell cracks, photoelectric conversion efficiency, electrical conductivity safety, anti-PID performance and other aspects. Good, good packaging performance after being applied to solar photovoltaic modules, high conductive safety, high photoelectric conversion rate, good anti-PID performance, low cost, and broad application prospects.