34results about How to "Avoid or reduce" patented technology

The invention discloses a boron diffusion method of a crystalline silicon solar cell. The method comprises the following steps of: (1) putting a silicon chip which is felted and cleaned into a diffusion furnace tube, raising temperature to 800 to 1,000 DEG C, filling oxygen, and oxidizing for 1 to 30 min; (2) keeping the temperature in the step (1), or raising the temperature to 900 to 1,100 DEG C, and filling a boron source, the oxygen and nitrogen for boron diffusion; (3) stopping filling the source, keeping the temperature or reducing the temperature to 800 to 900 DEG C, and keeping the temperature for 5 to 50 min in the nitrogen atmosphere; and (4) reducing the temperature, taking out the silicon chip, and finishing the diffusion process. By adoption of the method, the uniformity of the boron diffusion can be improved, formation of a boron-rich layer is avoided or reduced, and the minority carrier lifetime of the silicon chip is prolonged; and meanwhile, high surface impurity concentration can be kept, and high ohmic contact is formed, so the performance of the cell is improved.

The invention discloses a method for forming a gate dielectric layer, which comprises the following steps: providing a substrate which is provided with a silicon oxide layer; and executing nitriding process on the silicon oxide layer to form a nitrogen-containing silicon oxide layer, wherein the nitriding process at least comprises a step of ion implantation nitriding process. The invention also provides the gate dielectric layer, a semiconductor device and a manufacturing method thereof. The method can adjust the distribution of nitrogen in the gate dielectric layer according to requirements.

The present invention discloses a pork processing device used for a production of meat products. The pork processing device comprises a base seat, a box body, a stirring chamber and a crushing chamber. Walking wheels are arranged on a bottom part of the base seat, the box body is arranged on the base seat, a sliding chute is arranged on the base seat in the box body, a material taking groove is arranged on the sliding chute via sliding blocks, a second supporting plate is arranged in the box body at an upper side of the material taking groove, the stirring chamber is arranged on the second supporting plate, a first material discharge funnel extending to the material taking groove is arranged on a bottom part of the second supporting plate of an output end of the stirring chamber, and a servo motor is mounted on the second supporting plate at one side of the stirring chamber. The processing device is more comprehensive in a processing of pork. During a stirring in the stirring chamber,working staff can conduct a throwing of seasoning materials at the same time according to an amount of the pork and an amount of water in the stirring chamber. The processing device realizes the stirring and at the same time conducts a blending of the pork, avoids the blending by the working staff in a material discharge of the pork, and is strong in practicality and worthy of promotion and use.

The invention relates to an energy-saving and environment-friendly printer, comprising a printer body and a drying device (10). The energy-saving and environment-friendly printer is characterized in that the drying device (10) comprises an oven cap (20) and a base (50), and is provided with a printing product inlet (03) and a printing product outlet (04); the oven cap (20) is provided with a drying cavity (13) and a recovering cavity (14); an air supply unit (60), a heat pump condenser (88) and a refrigerating evaporator (96) are arranged in the oven cap (20); the air supply unit (60) comprises a fan (30) provided with an air inlet channel (63), an air exhaust channel (64) and an air outlet channel (68) to form an air blowing and circulating system; the heat pump condenser (88) is installed in the air supply unit (60), and the refrigerating evaporator (96) is installed in the recovering cavity (14). In the invention, drying equipment is firstly reformed, and an air channel with skillful interior is utilized to replace the original air channel with complicated structure and signal function, thereby the effects of compact structure, space saving and reduction of material consumption are achieved.

The embodiment of the invention provides a welding system and a welding method for friction stir welding. The welding system comprises a stirring head used for welding two to-be-welded base materials to form a weld joint, and a cooling device used for cooling the weld joint during welding. The welding method comprises the following steps: when the stirring head welds the two to-be-welded base materials to form the weld joint, the weld joint is cooled. According to the embodiment of the invention, the technical problem that the mechanical property of a welding joint formed by welding dissimilar materials through friction stir welding is poor is solved.

The invention belongs to the technical field of circuit board detection, and particularly relates to a circuit board stain and defect type class level-based detection and classification method, which comprises the following steps of: detecting and analyzing a circuit board according to the steps S1 to S6; each step is distinguished, so that the defect type of the defective circuit board is distinguished, the circuit board with known defects and the circuit board with stains is distinguished, and whether the circuit board with the stains is a circuit board with cleanable stains or a circuit board with non-cleanable stains is distinguished by cleaning the circuit board with the stains for multiple times. Therefore, the circuit board with the defects can be accurately divided, the reason for generating the defects is analyzed according to the problems existing in the circuit board with the defects, the production links and modes of the circuit board are adjusted, and then the frequency of generating the defects is avoided or reduced.

The invention relates to a circulating spouting type NOx emission reduction system and a working method thereof. The circulating spouting type NOx emission reduction system comprises a rotary kiln, asmoke chamber, a spouting ring, a fuel system, a tertiary air pipe, a reactor, a first material distribution valve, a first cyclone cylinder, a denitration system, a decomposing furnace, a hopper anda second cyclone cylinder. An air inlet of the smoke chamber is connected with an air outlet of the rotary kiln, an air outlet of the reactor is connected to one side of the decomposing furnace and communicated with the interior of the decomposing furnace, and an air inlet of the reactor is connected with an air outlet of the smoke chamber through the spouting ring. An air outlet of the tertiary air pipe is connected to the bottom of the decomposing furnace, a feeding port of the hopper is connected to the lower portion of the air outlet of the tertiary air pipe, and an air inlet of the secondcyclone is connected with an air outlet of the decomposing furnace; The formation of NOX is effectively avoided or reduced so that the emission reduction efficiency of NOX is improved, and the ammonia water consumption of the denitration system is greatly reduced to save the production cost; meanwhile, the problem of serious material accumulation at the bottom of the decomposing furnace is solved, and secondary pollution can be avoided.

The invention discloses a negative-pressure shoe storage cabinet which comprises a cabinet body, a cabinet door and a piston exhaust pump. A front-end opening of the cabinet body is provided with a sealing socket in the periphery, a rear-end opening of the cabinet door is provided with a sealing insertion edge corresponding to the sealing socket in the periphery, a shoe storage chamber is formed in the cabinet body, and the piston exhaust pump is installed in the shoe storage chamber through an air pump installing opening formed in the side face of the cabinet body. The negative-pressure shoe storage cabinet has an air exhaust function, and a part of air in the cabinet body is exhausted to enable the inside of the airtight shoe storage chamber to be in a negative-pressure state. Due to the fact that bacteria are difficult to survive and propagate in a negative-pressure environment and carbon dioxide gas for a long period of time, bacterial growth can be inhibited, bacterium breeding in shoe storage is avoided or decreased, and the negative-pressure shoe storage cabinet is high in efficiency and low in cost and achieves a good shoe storage purpose.

The invention discloses a negative pressure dry ice artwork storage box. The artwork storage box comprises a box body, a box cover, a piston exhaust pump and a dry ice storage chamber. Sealing inserting openings are formed in an upper end opening of the box body, sealing inserting strips corresponding to the inserting openings are arranged on a lower end opening of the box cover, an artwork storage chamber is formed in the box body and internally provided with the dry ice storage chamber, and the piston exhaust pump is arranged in the artwork storage chamber through an air pump installing opening formed in the side face of the box body. The artwork storage box has the function of pumping and exhausting air, and by pumping and exhausting part of the air in the box body, the sealed artwork storage chamber is internally in a negative pressure state; the dry ice storage chamber has the functions of storing dry ice and releasing carbon dioxide gas, the artwork storage chamber is filled with the released carbon dioxide gas and has the effect of bacteriostasis as bacteria have difficulty in surviving and breeding when located in a negative pressure environment with the carbon dioxide gas, bacterium breeding during artwork storage is avoided or reduced, the artwork storage box is high in efficiency and low in cost, and the purpose of storing artworks well is achieved.

The hard alloy degreasing furnace comprises a furnace body and a controller, a hydrogen input pipe, a nitrogen input pipe, an exhaust pipe, a safety valve and a pressure sensor are connected to the furnace body, valves are arranged on the hydrogen input pipe, the nitrogen input pipe and the exhaust pipe, all the valves and the safety valve are controlled by the controller to be opened and closed, and the pressure sensor is connected with the controller. The dewaxing method comprises the following steps: heating from room temperature to 600 DEG C according to a conventional method; after the temperature reaches 600 DEG C, nitrogen is introduced into the furnace body through a nitrogen input pipe, the ratio of nitrogen to hydrogen in the furnace body is 1: 3, then nitrogen and hydrogen are continuously introduced, the ratio of nitrogen to hydrogen is kept, and the temperature in the furnace body is uniformly increased to 800 DEG C from 600 DEG C within 120 minutes; the nitrogen and the hydrogen are kept to be introduced, the ratio of the nitrogen to the hydrogen is kept, and the temperature in the furnace body is kept at 800 DEG C for 60 minutes; and cooling to room temperature along with the furnace. A brittle third phase generated by W2C and cobalt is avoided or reduced, and the strength of the hard alloy is improved.

The invention discloses a negative-pressure dry ice drawing tool box which comprises a box body, a box cover, a piston exhaust pump and a dry ice storage chamber. An upper-end opening of the box body is provided with a sealing socket, a lower-end opening of the box cover is provided with a corresponding sealing insertion edge, a drawing tool storage chamber is formed in the box body, the dry ice storage chamber is formed in the drawing tool storage chamber, and the piston exhaust pump is installed in the box body through an air pump installing opening formed in the side face of the box body. The negative-pressure dry ice drawing tool box has an air exhaust function, a part of air in the box body is exhausted to enable the inside of the airtight drawing tool storage chamber to be in a negative-pressure state. In addition, the dry ice storage chamber has function of storing dry ice and carbon dioxide gas release functions, and released carbon dioxide gas is filled into the airtight drawing tool storage chamber. Due to the fact that bacteria are difficult to survive and propagate in a negative-pressure environment and carbon dioxide gas for a long period of time, the bacterial inhibiting effect is played, bacterium breeding in drawing tool storage is avoided or decreased, and the negative-pressure dry ice drawing tool box is high in efficiency and low in cost and achieves a good drawing tool storage purpose.

The invention discloses a low voltage boosting device for a rural power grid tail end. The low voltage boosting device for the rural power grid tail end comprises a box body and a protection device arranged at one side of the box body, the protection device is used for forming a magnetic field at the periphery of the box body, and a cavity is formed in the box body. A mounting frame is fixedly mounted in the cavity, an electric power device is fixedly mounted in the mounting frame, and driving mechanisms are fixedly mounted at the left side and the right side of the inner wall of the box body; sliding blocks are in threaded connection with the outer surfaces of the two driving mechanisms, a moving plate is fixedly mounted between the two sliding blocks, a brush is fixedly installed on the rear side wall of the moving plate, and a dust removal mechanism is fixedly installed at the bottom of the cavity. Dust can be discharged into a dust collecting groove through a dust discharging pipe, and convenience is provided for the subsequent cleaning work of workers.

The invention discloses a negative-pressure dry ice shoe storage cabinet which comprises a cabinet body, a cabinet door, a piston exhaust pump and a dry ice storage chamber. A front-end opening of the cabinet body is provided with a sealing socket in the periphery, a rear-end opening of the cabinet door is provided with a sealing insertion edge corresponding to the sealing socket in the periphery, a shoe storage chamber is formed in the cabinet body, the dry ice storage chamber is formed in the shoe storage chamber, and the piston exhaust pump is installed in the shoe storage chamber through an air pump installing opening formed in the side face of the cabinet body. The negative-pressure dry ice shoe storage cabinet has an air exhaust function, and a part of air in the cabinet body is exhausted to enable the inside of the airtight shoe storage chamber to be in a negative-pressure state. In addition, the dry ice storage chamber has function of storing dry ice and carbon dioxide gas release functions, and released carbon dioxide gas is filled into the shoe storage chamber. Due to the fact that bacteria are difficult to survive and propagate in a negative-pressure environment and carbon dioxide gas for a long period of time, the bacterial inhibiting effect is played, bacterium breeding in shoe storage is avoided or decreased, and the negative-pressure dry ice shoe storage cabinet is high in efficiency and low in cost and achieves a good shoe storage purpose.

The invention discloses a negative pressure dry ice book storage box. The negative pressure dry ice book storage box comprises a box body, a box cover, a piston exhaust pump and a dry ice storage chamber. An opening in the upper end of the box body is provided with a sealing insertion opening, and an opening in the lower end of the box cover is provided with a corresponding sealing insertion edge. A book storage chamber is arranged in the box body, and the dry ice storage chamber is arranged in the book storage chamber. The piston exhaust pump is installed in the box body through an air pump installation opening formed in the side face of the box body. The negative pressure dry ice book storage box has the air pumping function, and the negative pressure state is formed in the airtight book storage chamber by pumping out part of air in the box body; meanwhile, the dry ice storage chamber has the dry ice storage and carbon dioxide gas release functions, and the book storage chamber is filled with released carbon dioxide gas; due to the fact that bacteria can not survive or breed easily if the bacteria stay in a negative pressure environment or carbon dioxide gas for a long time, the bacterium restraining effect is achieved, and bacterium breeding in book storage is avoided or reduced; and besides, the negative pressure dry ice book storage box is high in efficiency, low in cost and capable of storing books well.

The invention discloses a portable computer keyboard, the action of pressing and releasing a key position is used for inputting two key positions, so the portable computer keyboard can only use 12 key positions to replace the 121 keys of the previous keyboard of a PC machine and achieve the equivalent input speed.

The invention discloses a negative pressure dry ice drawing paint box which comprises a box body, a box cover, a piston exhaust pump and a dry ice storing chamber. An upper end opening of the box body is provided with a sealing inserting opening. A lower end opening of the box body is provided with a corresponding sealing inserting side. A paint storing chamber is arranged in the box body. The dry ice storing chamber is arranged in the paint storing chamber. The paint storing chamber is divided into a plurality of paint cells. The piston exhaust pump is arranged in the box body through an air pump mounting opening formed in the side face of the box body. The paint box has an air pumping function, by pumping part of air in the box body, a negative pressure state is generated in the closed paint storing chamber, meanwhile, the dry ice storing chamber has functions of carbon dioxide gas releasing and dry ice storing, the paint storing chamber is filled with the released carbon dioxide gas, bacteria are in a negative pressure environment and carbon dioxide gas for a long time and cannot survive and reproduce easily, so that the effect of bacterium restraining is achieved, bacterium breeding in paint storing is avoided or lowered, efficiency is high, cost is low, and the purpose of drawing paint storing is well achieved.

The invention discloses a negative-pressure dry ice clothes storage cabinet which comprises a cabinet body, a cabinet door, a piston exhaust pump and a dry ice storage chamber. A front-end opening of the cabinet body is provided with a sealing socket in the periphery, a rear-end opening of the cabinet door is provided with a sealing insertion edge corresponding to the sealing socket in the periphery, a clothes storage chamber is formed in the cabinet body, the dry ice storage chamber is formed in the clothes storage chamber, and the piston exhaust pump is installed in the clothes storage chamber through an air pump installing opening formed in the side face of the cabinet body. The negative-pressure dry ice clothes storage cabinet has an air exhaust function, and a part of air in the cabinet body is exhausted to enable the inside of the airtight clothes storage chamber to be in a negative-pressure state. In addition, the dry ice storage chamber has function of storing dry ice and carbon dioxide gas release functions, and released carbon dioxide gas is filled into the clothes storage chamber. Due to the fact that bacteria are difficult to survive and propagate in a negative-pressure environment and carbon dioxide gas for a long period of time, the bacterial inhibiting effect is played, bacterium breeding in clothes storage is avoided or decreased, and the negative-pressure dry ice clothes storage cabinet is high in efficiency and low in cost and achieves a good clothes storage purpose.

The invention provides a preparation method o a SOI wafer. The preparation method comprises the following steps: oxidizing the cleaned high-resistance silicon wafer and obtaining the high-resistance silicon wafer with an oxygen-doped polysilicon layer by low-pressure chemical vapor deposition; oxidizing the cleaned low-resistance silicon wafer and performing hydrogen ion injection of the low-resistance silicon wafer with the silicon oxide layer; performing bonding and annealing treatment on the high-resistance silicon wafer with the oxygen-doped polysilicon layer and the injected low-resistance silicon wafer so as to obtain a bonding wafer; splitting the bonding wafer to obtain the SOI with the oxygen-doped polysilicon layer; cleaning the SOI and performing annealing treatment so as to obtain a processed SOI wafer; and performing cleaning and CMP process so as to obtain the SOI wafer with the oxygen-doped polysilicon layer. The preparation method of the SOI wafer can suppress the surface parasitic conductance of the silicon substrate, limit the capacitance change and reduce the power of generated harmonics, thus minimizing the loss of the resistivity of the high-resistance SOI substrate.

The invention discloses a negative pressure clothes storing cabinet which comprises a cabinet body, a cabinet door and a piston exhaust pump. A sealing inserting opening is formed in the periphery of a front end opening of the cabinet body. A sealing inserting side corresponding to the sealing inserting opening is arranged on the periphery of a back end opening of the cabinet door. A clothes storing chamber is arranged in the cabinet body. The piston exhaust pump is arranged in the clothes storing chamber through an air pump mounting opening formed in the side face of the cabinet body. The negative pressure clothes storing cabinet has the function of air pumping, by pumping part of air in the negative pressure clothes storing cabinet, a negative pressure state is generated in the closed clothes storing chamber, bacteria cannot survive and reproduce in a negative pressure environment, so that bacterium growing can be restrained, bacterium breeding in clothes storing is avoided or lowered, efficiency is high, cost is low, and the purpose of clothes storing is well achieved.