54results about How to "Reduce or avoid the generation of" patented technology

The invention discloses a micro-expansive moderate-heat Portland cement and a production method thereof. The cement contains micro-expansive moderate-heat Portland cement clinker and gypsum in a weight ratio of 92:8-98:2, and also comprises grinding aid which accounts for 0-0.1 wt% of the sum of micro-expansive moderate-heat Portland cement clinker and gypsum. The raw meal of the micro-expansive moderate-heat Portland cement clinker is prepared from the following raw materials in percentage by weight: 65-80% of calcium raw material, 5-20% of silicon correction raw material, 5-15% of iron correction raw material and 3-10% of magnesium correction raw material. The micro-expansive moderate-heat Portland cement clinker is prepared by the following steps: grinding the raw meal, dehydrating the slurry, drying and crushing the filter cake, and firing to obtain the clinker. By adopting the low-aluminum high-iron high-magnesium low-saturation-ratio formula, the invention effectively controls the hydration heat of cement, displays the micro-expansive property, and can compensate the volume shrinkage in the concrete cooling process, thereby reducing or avoiding cracks.

The invention provides a magnesium and steel special metal superaudio frequency pulse laser smelting braze-welding wire and a welding method. The welding method comprises the following steps of: forming a beveled edge on a part to be welded of a magnesium alloy and a steel workpiece, and removing oil dirt and an oxidation film from the surface of the workpiece; fixing the magnesium alloy and the steel workpiece on a welding fixture, adjusting the position and the angle of a wire feeding device, automatically feeding the welding wire at a certain angle in front of a laser beam, and protecting a welding seam through argon, wherein the welding wire comprises the following components in percentage by weight: 2 to 10 percent of Al, 0.5 to 5 percent of Zn, 0.1 to 1 percent of Sr, 0.05 to 0.2 percent of B, 0.5 to 2 percent of RE and the balance of Mg; and placing the laser beam on one side of the magnesium alloy workpiece in a slightly deviating way, and heating the welding wire and the magnesium alloy workpiece by using superaudio frequency pulse laser to form a smelting pool, wherein the steel workpiece is kept in a solid state substantially in a welding process and acts with liquid magnesium alloy to form a welding joint. The key and common problem that the improvement of the welding quality of Mg/Fe and Mg/Ti immiscible heterogeneous metal is limited is solved, and the application range of laser smelting braze-welding is expanded.

The invention belongs to the technical field of clad material continuous casting, in particular to clad material solid/liquid composite dual-solidification continuous casting and forming equipment and method. The clad material solid/liquid composite dual-solidification continuous casting and forming equipment and method are characterized in that inversion solidification and forward solidification continuous casting and forming are combined, the measures that core materials are not heated in advance, an inversion solidification device with small capacity is designed, the core materials are prevented from penetrating through clad layer melt metal for a long time, the melt metal flows out from the bottom of a crucible by relying on self-weight, and the size of the inversion solidification device and the size of a water-cooled crystallizer are controlled effectively are taken, the high quality clad materials of needed shapes and sizes are formed through continuous casting, and the equipment and the method are especially suitable for continuous casting forming of the high quality clad materials with the melting point of the clad layer metal lower than that of the core material metal. The equipment and method have the advantages that the equipment is simple in structure, parts are easy to replace, operation and maintenance are convenient to carry out, layout is reasonable and compact, investment is small, industrialized application and popularization are facilitated, the procedure of the forming process is short, energy is saved, environment is protected, cost is low, the combination freedom of the clad layer metal and the core material metal is large, and the prepared clad materials are good in quality and performance.

The invention discloses a method for recycling lithium cobalt oxide from a waste positive electrode of a lithium cobalt oxide battery. The method comprises the following steps of: (1) feeding the waste positive electrode of the lithium cobalt oxide battery into a 1-2mol/L hydrochloric acid lixivium in which citric acid is dissolved, and reacting for 4-6 hours at 60-80 DEG C; (2) filtering the lixivium in the step (1) so as to separate aluminum foil and solid grains; and (3) washing and drying the solid grains; and (4) adding a lithium source into the solid grains to adjust the mass ratio of Co/Li in the solid grains, uniformly mixing, calcining and cooling so as to obtain lithium cobalt oxide. The method adopts the mixed acid of citric acid and hydrochloric acid as the lixivium so as to effectively separate a positive electrode material and the aluminum foil, the process is simple, and no toxic or harmful gases are generated. The first discharge capacity of recovered lithium cobalt oxide can still be 140mAh/g, and the discharge capacity after 40 times of charge and discharge circulation is not less than 90%.

The invention discloses an electric cooking appliance and belongs to the field of household appliances. The electric cooking appliance comprises a chamber, a steam generator and a water purifier, wherein a cooking cavity is defined in the chamber; the steam generator communicates with the cooking cavity and is used for providing steam into the chamber; the water purifier is provided with a raw water inlet and a first purified water outlet which is connected with the steam generator. According to the embodiment of the invention, the electric cooking appliance is high in cooking efficiency, clean and sanitary.

The invention discloses a block type multidirectional forging device, which comprises a frame, a die for forming a product and a hydraulic transmission device. The hydraulic transmission device comprises a main cylinder, a jacking cylinder and at least two lateral extrusion cylinders, wherein a movable element is arranged at the rear end of each lateral extrusion cylinder; and the frame comprisesa bracket and fasteners in wrapped connection with the outer sides of the movable elements and used for fixedly connecting a plurality of movable elements sequentially, and each fastener has a closedannular structure. According to the device, the movable elements are arranged at the rear ends of the lateral extrusion cylinders and fixedly connected with the fasteners, and when each lateral extrusion cylinder extrudes a workpiece, a force reacting on the frame can directly act on the fasteners; and because the fasteners have the closed annular structures, stress balance at each position of the fasteners is ensured, the forging precision is effectively ensured, degraded products are reduced or avoided, the working efficiency is improved, and the production cost is reduced.

The invention relates to a tin plating electrolyte which contains a solvent and the materials with following concentration: 10-20g/L of tin methane sulfonate, 30-60g/L of methanesulfonic acid, 0.4-5g/L of compound additive, and a proper amount of PH regulator; and the compound additive is formed by thiourea, hydroquinone, 2-mercapto benzimidazole and propylene glycol block polyether. For the tin plating electrolyte, by reasonably selecting types and use amount of additives, the problems of instable plating solution and high cost in the methanesulfonic acid system are solved, and by using the tin plating electrolyte, a high-mass plating layer is acquired beneficially.

The embodiment of the invention provides an array substrate, a display panel and a display device. The array substrate comprises a substrate, a transistor, a light shielding component, wherein the transistor includes an active layer disposed on the substrate; and at least part of the light shielding component is located on the active layer, and the light shielding component covers at least part ofthe active layer. According to the array substrate provided by the embodiment of the invention, photon-generated carriers generated by external light in a channel of the transistor can be reduced oravoided, normal and stable operation of the transistor is ensured, and the service life of the array substrate is prolonged. When the array substrate provided by the embodiment of the invention is applied to the display panel, light transmission and display of the display panel can be realized, and under-screen integration of a photosensitive assembly is facilitated.

The invention discloses a method for preparing sugammadex sodium. The method is characterized in that perhalogeno gamma-cyclodextrin and 3-mercaptopropionic acid or/and a sodium salt thereof are subjected to a replacement reaction in a sodium base-reducing agent-organic solvent system for preparing sugammadex sodium, the method effectively controls the formation of process impurities with similarstructure of sugammadex sodium from a reaction process, and obtains high-yield and high-purity product after simple post-treatment. The invention further provides a method for purifying of a crude product of the sugammadex sodium and conversion of impurities to the target product in a one-step reaction, which is simple, efficient and wasteful, the method improves the yield and purity from variousaspects, and solves the problems of complex operation, high requirements on instruments and low yield in the prior art method, and is suitable for industrial mass production of the sugammadex sodium.

The invention discloses a lipoic acid liquid preparation and a preparation method thereof. The lipoic acid liquid preparation comprises main lipoic-acid ingredients, polymerization inhibitor lysine and a pH (potential of hydrogen) modifier. Though simple in component, the preparation can obviously improve stability of liquid medicine under high-temperature sterilization and high-light exposure, and generation of impurities of lipoic acid dimmers can be particularly greatly lowered. The effect of stabilizing the quality of the liquid medicine is further enhanced by adding an auxiliary stabilizer D-sorbitol. The preparation technology of injection is strictly controlled by performing entire nitrogen protection during liquid dosing, dissolution and potting and timely monitoring the oxygen volume of the liquid medicine, degradation of lipoic acid in water solution is effectively controlled, and the lipoic acid liquid preparation is ensured to be safe and effective in clinical application.

The invention provides a semiconductor device and a forming method. The semiconductor device comprises a semiconductor substrate, a dielectric layer and a conductive plug, wherein the dielectric layeris located on the semiconductor substrate. The dielectric layer comprises a dopant, and the total doping concentration of the dopant in the dielectric layer is gradually reduced in the direction faraway from the surface of the semiconductor substrate. A through hole for exposing the conductive structure is formed in the dielectric layer, and the conductive plug is disposed in the through hole. The total doping concentration of the dopant in the dielectric layer of the semiconductor device provided by the invention is gradually reduced in the direction far away from the semiconductor substrate; due to the fact that the dielectric layer with the large doping concentration can be etched and removed more easily, when the dielectric layer is etched to form the through hole, the etching rate cannot be obviously reduced along with the increase of the etching depth, the bottom appearance of the through hole can be improved, the through hole meeting the requirement is formed, and then the performance of the semiconductor device is improved.

The invention discloses a liquid drop type PCR (Polymerase Chain Reaction) chip and a liquid drop type PCR detection system. The liquid drop type PCR chip comprises at least one unit, wherein each unit comprises an oil phase liquid storage tank, a PCR reagent liquid storage tank, a liquid drop tiling cavity and an outlet liquid storage tank; the PCR reagent liquid storage tank and the oil phase liquid storage tank are converged through a fluid flow path and converge to a droplet generation channel; one end of the liquid drop tiling cavity communicates with the liquid drop generation channel so as to receive the generated liquid drops, and the liquid drop tiling cavity provides a PCR amplification reaction place for the liquid drops; the outlet liquid storage tank is connected to the other end of the liquid drop tiling cavity so as to discharge air extruded by the liquid drops in the liquid drop tiling cavity; and each liquid storage tank is also used for receiving mineral oil so as to seal the liquid drop tiling cavity. Therefore, liquid drops are prevented from being squeezed out of the liquid drop tiling cavity due to leakage of bubbles generated by heating in oil phase; and in addition, the vapor pressure generated by heating in the oil phase is retained in the liquid drop type PCR chip after sealing, so that the vapor pressure in the liquid drop tiling cavity is improved, and bubbles generated in the liquid drop type PCR chip can be reduced or avoided.

The invention provides a downward drift layered cemented filling mining method, and belongs to the technical field of layered cemented filling mining methods. The downward drift layered cemented filling mining method provided by the invention avoids tunnelling of a filling tunnel and a small filling well, reduces or avoids a large quantity of rubbles and improves the filling height of a mined-out stope access. By adopting the mining method, the small filling well and the filling tunnel are not tunnelled, so that waste stone produced by tunnelling the small filling well and the filling tunnel is eliminated, ore dilution is reduced, and blasting fume poisoning accidents and susceptible dampness syndromes produced during upward tunnelling are prevented; filling pipes are not erected over the stope access, so that overhead operation is avoided, and the filling pipes are omitted; meanwhile, the stope access can be fully filled to the top, and the safety of stope top plates is improved.

The invention discloses a bolt-free PCB wiring terminal provided with a button. The bolt-free PCB wiring terminal provided with the button includes a base, a flat sheet spring, a clamping part, and a button; wherein the flat sheet spring and the clamping part are adaptively arranged in an accommodating cavity of the base, and the upper part of the flat sheet spring is elastically pressed against the top of the clamping part in an inclined manner; a button groove is arranged in the top of the base, and the button is slidably limited in the button groove; a first through hole for allowing the button to pass through, is arranged in the top of the clamping part, the side part of the base is provided with a wire inserting hole leading to the accommodating cavity and corresponding to the inclined upper part of the flat sheet spring, and the wire inserting hole allows a wire to push away the flat sheet spring and to be clamped between the flat sheet spring and the clamping part. According to the bolt-free PCB wiring terminal provided with the button, through improving a structure, the wiring capacity of the wiring terminal is improved and the reverse warping during wire withdrawing of a clamping spring can be avoided, and the damage to the wire due to wire withdrawing can be reduced; the bolt-free PCB wiring terminal provided with the button has the characteristics of wire fast connection, high reliability, and large wiring capacity.

The invention discloses roasting equipment, and particularly relates to a barbecue oven which comprises a hollow oven body, infrared oven heads and a roasting net, wherein the oven heads are arranged on the left and right side walls in the oven body, respectively; the roasting net is arranged above the oven heads. When the barbecue oven is in use, oil drops generated by food freely drips to the bottom of the oven body; since the infrared oven heads are arranged on the side walls of the oven body, the oil drops do not touch the infrared oven heads, much smoke generated by the oil drops vaporized instantly at high temperature is avoided, and thus environmental pollution is reduced. The barbecue oven provided by the invention is reasonable in structure and convenient to use, and roasted food generates little smoke; moreover, the temperature in the oven is uniform, the roasting quality of heated food is effectively guaranteed, and the heat efficiency of roasting is greatly improved.

The invention discloses making methods of a grid electrode and a thin film transistor. The making method of the grid electrode comprises the following steps of providing a base plate; forming a firstmetal layer on the base plate; forming an aluminum and molybdenum composite metal layer on the first metal layer; forming a second metal layer on the aluminum and molybdenum composite metal layer so as to form the grid electrode. The making methods of the grid electrode and the thin film transistor provided by the embodiment of the invention have the advantages that the generation of a burr structure of the grid electrode can be reduced or avoided; the work efficiency of the thin film transistor is further improved.

The invention discloses a moisture-proof distribution box comprising a bottom plate, a top plate and four side plates, four angle steels vertically distributed at four corners are detachably fixed on the bottom plate, the side plates are detachably connected among the angle steels to form four box walls of the distribution box, and the top plate detachably covers the tops of the angle steels. Each side plate is formed by detachably combining an outer plate body, a heat preservation plate and an inner plate body, the heat preservation plate is located between the outer plate body and the inner plate body, a grid-shaped window is formed in the outer plate body, and a movable blocking cover is arranged on the outer side of the window. The side plates of the distribution box are formed by combining the outer plate bodies, the inner plate bodies and the middle heat insulation plates, and heat exchange between the outside and the interior of the distribution box is blocked by the heat insulation plates at night in winter, so that the condition that hot air in the distribution box is cooled and liquefied is well improved, and fog water generated on the inner wall of the distribution box is reduced or avoided. Therefore, the problems of corrosion and circuit faults in the distribution box are solved, and the service life of the distribution box is prolonged.