72results about How to "Improve strain performance" patented technology

The invention discloses a lithium ion battery silicon-based cathode composite binder, a preparation method and application thereof. The composite binder comprises modified polyacrylic acid and polyionliquid, wherein the molecular formula of the modified polyacrylic acid is abbreviated as PAAH<1-X>-Li<X>; the polyion liquid PIL / TFSI contains di(trifluoromethyl sulfonyl) imide anions. The compositebinder combines the excellent binding performance of polyacrylic acid and the good ionic conductivity of polyion liquid, and is beneficial to the diffusion and transmission of lithium ions in a silicon negative electrode; in addition, since the PIL / TFSI used in the method has low glass transition temperature and good flexibility, the strain performance of PAAH<1-X>-Li<X> is effectively improved,which is suitable for the expansion of the volume of the silicon cathode and improves the cycling stability of the silicon cathode. The silicon-based cathode material of the lithium ion battery prepared by the composite binder can effectively reduce the internal resistance of lithium ion transmission and effectively improve the cycle stability of the battery.

The invention discloses a high-temperature-resisting anti-corrosive thermal-insulation composite lining structural member and a manufacturing method thereof. The high-temperature-resisting anti-corrosive thermal-insulation composite lining structural member comprises a metal shell, a light thermal-insulation lining material layer, a cellucotton layer and an anchor nail, further comprises a dew-point corrosion preventing coating layer, and can also comprise high-temperature-resisting alloy-steel wires and a high-temperature-resisting fiber paper layer. The manufacturing method comprises the following steps of welding and fixing the head of the anchor nail on the inner wall of the metal shell body, blade-coating the dew-point corrosion preventing coating layer, applying the light thermal-insulation lining material layer, and spray-coating the cellucotton layer. According to the invention, a composite lining layer is formed by the dew-point corrosion preventing coating layer, the light thermal-insulation lining material layer and the cellucotton layer through a special structure, which play the roles of resisting high-temperature, preventing dew-point corrosion and insulating heat simultaneously, and ensures that the composite lining layer can be combined with a shell body of a thermal facility into a firm integer; meanwhile, the composite lining structural member has better strain property on expansion on heating and contraction on cooling, and makes petrochemical thermal power equipment be used for a long time in the reliable and economical premise.

The invention discloses a preparation method of a shearing type piezoelectric fiber composite material. The preparation method comprises the following steps of performing cutting on one surface of a lead zirconate titanate piezoelectric ceramic sheet polarized in the thickness direction to form uniformly arranged piezoelectric fibers; filling the fiber gaps with epoxy resin and performing curing to obtain piezoelectric fibers filled with epoxy resin; performing thinning on one surface, opposite to the cutting surface, of the lead zirconate titanate piezoelectric ceramic sheet to obtain a leadzirconate titanate piezoelectric ceramic-epoxy resin composite layer; enabling the upper and lower surfaces of the lead zirconate titanate piezoelectric ceramic-epoxy resin composite layer to be compounded with flexible interdigital electrodes by epoxy resin, wherein the flexible interdigital electrodes on the upper and lower surfaces are in mirror symmetry, and the finger parts of the flexible interdigital electrodes are parallel to the piezoelectric fibers; and performing curing on the epoxy resin. The method is simple in process, and the obtained piezoelectric fiber composite material has high overall performance and clear piezoelectric fibers, certain flexibility and bending deformation resistance, and high electrical performance, strain performance and driving performance.

The invention discloses a modified phosphogypsum-based concrete prefabricated part and a preparation method thereof. The preparation method sequentially comprises the following steps: S1, modificationof phosphogypsum; S2, preparation of concrete; and S3, preparation of the prefabricated part. According to the method, lime pretreatment is adopted, so that the influence of soluble phosphorus and fluorine on the practical performance of ardealite can be eliminated; the precast concrete component prepared from chemical fibers, additives, concrete raw materials, modified ardealite and the like isexcellent in performance and meets the quality requirements of fabricated building construction.

The invention discloses a method for improving interfacial property and mechanical property of an organic powder-polyurethane composite material. The preparation process comprises the following steps:preparing a polyurethane composite solution, preparing a coagulating bath, performing knife coating on the polyurethane composite solution, and performing phase conversion molding and drying treatment. According to the method, a ternary mixed solvent prepared by blending a poor solvent of polyurethane, N,N-dimethylformamide and a solvent with polarity lower than that of the N,N-dimethylformamideis adopted on premise of not changing the preparation process of the organic powder-polyurethane composite material, so that unmodified organic powder can be well uniformly dispersed in the polyurethane solution, the original characteristics of organic powder particles are remained, and the mechanical property of the composite material is improved. The prepared organic powder-polyurethane composite material has excellent strength and strain property, is simple in preparation process, and has wide market requirement prospects in the fields of textile bionics, clothing and the like.

The invention discloses a wind induction intelligent constant-temperature ecological curtain wall system and a temperature control method and belongs to the field of curtain walls. The system and method solve the problem of high energy consumption of an air-conditioning system. Through combination of a computer system and a constant-temperature curtain wall, multiple work modes are realized, intelligent selection and switch of work modes are achieved according to the temperature in a room, the temperature of a hollow interlayer, the temperature outside the room and the air speed outside the room, so that intelligent temperature control is achieved, energy consumption of the air-conditioning system is reduced during heating and cooling, and energy saving effect and environment adaptability are good.

The invention discloses a manufacturing method of a mechanical uniaxial strain SOI (silicon-on-insulator) wafer. The method comprises the following steps: 1) putting an SOI wafer on a cambered bending table, wherein the top layer (Si layer surface) of the SOI wafer faces up or down; 2) respectively horizontally putting two cylindrical stainless steel pressure bars on both ends of the SOI wafer, wherein the two cylindrical stainless steel pressure bars are respectively 1cm away from the edge of the SOI wafer; 3) slowly rotating a screw cap which connects the pressure bars, so that the SOI wafer is gradually bent along the cambered table until the SOI wafer is completely laminated on the cambered table; 4) putting the cambered bending table carrying the SOI wafer in an annealing furnace, and carrying out annealing; 5) after the annealing finishes, slowly cooling to room temperature, and taking out the cambered bending table carrying the SOI wafer; and 6) rotating the screw cap which connects the pressure bars, and slowly elevating the pressure bars until the bent SOI wafer restores to the original state. The invention has the advantages of 1) favorable strain effect, 2) small surface roughness, 3) fewer surface defects, 4) favorable thermal properties, 5) high electric properties, 6) high yield, 7) wide annealing temperature range, 8) simple manufacturing technique, 9) fewer manufacturing devices which can be self-made, 10) low manufacturing cost and 11) accessible raw materials.

The invention discloses a multi-stage cutting drainage air distribution device. The multi-stage cutting drainage air distribution device comprises a flow guide air hopper, an air distribution plate and an air uniformizing plate. The flow guide air hopper is composed of a plurality of arc-shaped air cutting guide plates with different radians. A first-stage air guide plate cutter opening of each arc-shaped air cutting guide plate is located in one side of an air inlet. The air distribution plate is composed of a plurality of movable air cutting guide plates. A second-stage air guide plate cutter opening of each movable air cutting guide plate faces the side where an air outlet of the flow guide air hopper is located, and the structure of each movable air cutting guide plate can guide the air direction to be the vertical direction. The air uniformizing plate is a plate with a plurality of boxes and is arranged perpendicularly below or above an air outlet of the air distribution plate. The invention further discloses a drying chamber comprising the multi-stage cutting drainage air distribution device and a dryer.

The invention belongs to the field of medical instruments, and relates to a uterine cavity compression hemostatic balloon catheter and a control system thereof. According to the uterine cavity compression hemostasis balloon catheter, a balloon and a balloon catheter are both provided with imaging rubber strips, so that doctors can quickly track and position the displacement of the catheter in a vagina and a uterine cavity at any time, and the operation is convenient and fast; after the balloon is inflated, the balloon is in an inverted pear shape, and in the balloon inflation process, exuded blood can be smoothly discharged out of the uterine cavity from a catheter drainage cavity and an outer surface of the balloon, so that blood clots are prevented from hindering the balloon to adhere tothe uterine wall, which influences the hemostatic effect. The uterine cavity compression hemostaticballoon catheter control system has the advantages of automatic control, safety monitoring and simple operation, can more intelligently and scientifically control the capacity of the balloon, ensures that the balloon can be tightly attached to the uterine cavity, and has a good hemostatic effect; the uterine cavity compression hemostatic balloon catheter can rapidly and accurately position, track and monitor safety.

The invention relates to an air quality-inducing intelligent constant temperature ecological curtain wall system and a temperature control method, belongs to the field of curtain walls and solves the problem that an air conditioning system is high in energy consumption. The system is combined with a constant temperature curtain wall by virtue of a computer system, so that the system has multiple working modes; the working modes are intelligently selected and switched according to the indoor and outdoor temperatures, the temperature of a hollow interlayer and an outdoor air quality, and intelligent temperature control is realized, so that the energy consumption of the air conditioning system in heating and refrigerating processes is reduced, and the system has a good energy-saving effect and an ability of coping with environmental changes.

The invention discloses an integrated rain induction intelligent constant-temperature ecological curtain wall system and a temperature control method and belongs to the field of curtain walls. The problem that an air conditioning system is high in energy consumption is solved. According to the integrated rain induction intelligent constant-temperature ecological curtain wall system and the temperature control method, a constant-temperature curtain wall is combined with a computer system so as to have a plurality of working modes, the working modes are intelligently selected and switched according to an indoor hollow interlayer, the outdoor temperature and the outdoor rainfall, and intelligent temperature control is achieved; and thus, energy consumption of an air conditioning system in heating and refrigerating processes is reduced, and a good energy-saving effect and good environmental change response capacity are achieved.

The present invention provides a supervision and control method for UAV (unmanned aerial vehicle) threat avoidance by a manned vehicle, relating to the field of UAV. According to the method, a supervisory control mode, an environmental factor and threat avoidance action are defined and corresponding values are defined, the inference and judgment of optional threat avoidance actions is carried out, then a final threat avoidance action is judged according to a judgment result, and the threat avoidance is completed. For a known threat, the UAV fully plays independence ability to independently complete threat avoidance or completes operation under the guidance of the manned vehicle. For an unknown threat, the UAV completes avoidance under the guidance of the manned vehicle, and the autonomous execution ability of the UAV and the analysis and judgment ability of a manned vehicle operator are fully played. For an extreme case such as the interruption of communication, the UAV ensures its own safety through adjusting the supervisory control mode. A variable self-supervision and control mode is combined with the characteristics of UAV and the manned vehicle, and the method has good action ability in emergency for different threat types and environmental conditions.

The invention discloses a manufacturing method of a carbon fiber ecological decorating plate. The manufacturing method comprises three steps of plate core treatment, decorating plate treatment, and blank combination and gluing. During plate core gluing, carbon fibers are added, so that the performance of a product can be improved by using such characteristics of the carbon fibers as small density, high intensity, high durability, high resistant to corrosion, high strain capacity and the like; meanwhile, in a manufacturing process, a plate core and a decorating plate are respectively subjected to flame retardant and antibacterial treatment, so that the product is safer and more sanitary to use, and the competitiveness of the product in the market is enhanced.

The invention discloses an intelligent culture system for fish-vegetable co-growth. The system comprises a fish tank as well as an external water source supplementation poor, a recycling poor, a physical filtering bucket, a biologic filtering bucket and a control box disposed on one side of the fish tank, wherein an intelligent monitoring probe and a feeding device are disposed in the fish tank; a pH value control device is disposed on the top of the recycling poor; temperature control devices are disposed on tops of the physical filtering bucket and the biological filtering bucket; a second submerged pump is disposed in the biologic filtering bucket; and multiple vegetable water planting grooves are formed in one side of the physical filtering bucket. The overall structure is simple; design is rational; nitrogen sources of fish and vegetables come from fish fodder; soil, fertilizers and pesticides do not need to be used; the use rate of water is high; only a few of waste is generated; production can be controlled easily, and more manpower can be saved; the output rate is high; the cultivated fish and vegetables have high quality; the culture system can be monitored and operated at other places; the strain capacity to special events is high; and automatic culture can be achieved.

The invention discloses a rain induction intelligent constant-temperature ecological curtain wall system and a temperature control method and belongs to the field of curtain walls. The problem of high energy consumption of an air conditioner system is solved. A computer system is combined with a constant-temperature curtain wall, so that various working modes are achieved. In addition, the working modes are selected and switched intelligently according to the indoor temperature, the temperature of a hollow interlayer, the outdoor temperature and the outdoor rainfall, intelligent temperature control is achieved, energy consumption of the air conditioner system during heating and refrigeration is reduced, and a good energy saving effect and environmental change coping capacity are achieved.

The invention belongs to the technical field of medicine, and particularly relates to a target composition capable of improving light cognition impairment and a preparation method thereof. The targetcomposition is prepared from the following components in percentage by weight: 20 to 30 percent of L-carnitine, 15 to 30 percent of fructus alpiniae oxyphyllae extract, 10 to 30 percent of folium ginkgo extract, 10 to 30 percent of boxthorn leaf extract, 0.005 to 0.02 percent of cyanocobalamin, 0.01 to 0.03 percent of L-5-methyl-tetrahydrofolic acid and 10 to 30 percent of auxiliary material. Thetarget composition has a remarkable effect when used for improving light cognitive impairment.

The disclosure, which belongs to the technical field of computers, provides an unmanned vehicle control method, an unmanned vehicle control device, electronic equipment and a computer readable storagemedium. The method comprises the following steps: mapping an area where a target vehicle is located into a grid map; determining state information of the area according to an obstacle in the area andthe position of the target vehicle in the grid map; inputting the state information into a pre-trained deep reinforcement learning network to obtain a control instruction about the target vehicle; and controlling the target vehicle according to the control instruction. According to the invention, the unmanned vehicle can be effectively controlled, so that the unmanned vehicle can run safely and efficiently.

The invention relates to a compound groove tank for a tanker, which comprises a metal tank body at the inner layer. A casting polyurethane elastomer compound layer is at least integrally compounded outside a cylinder body of the metal tank body and an end enclosure, or a casting polyurethane elastomer belly line covers outside the cylinder body of the metal tank body and the end enclosure. The dead weight of the compound tank body can be effectively lightened, therefore, the weight lightened can be used for increasing the product loading capacity. The invention improves the product conveying quantity under the condition of not changing the total tonnage of the tanker, enhances the conveying efficiency, lowers the conveying cost, has low fuel consumption, and is beneficial to environment protection.

The invention discloses a manufacturing method of a mechanical uniaxial strain GeOI (germanium-on-insulator) wafer based on an SiN buried insulating layer, which comprises the following steps: 1) putting a GeOI wafer on a cambered bending table, wherein the top layer (Ge layer surface) of the GeOI wafer faces up or down; 2) respectively horizontally putting two cylindrical stainless steel pressure bars on both ends of the GeOI wafer, wherein the two cylindrical stainless steel pressure bars are respectively 1cm away from the edge of the GeOI wafer; 3) slowly rotating a screw cap which connects the pressure bars, so that the GeOI wafer is gradually bent along the cambered table until the GeOI wafer is completely laminated on the cambered table; 4) putting the cambered bending table carrying the GeOI wafer in an annealing furnace, and carrying out annealing; 5) after the annealing finishes, slowly cooling to room temperature, and taking out the cambered bending table carrying the GeOI wafer; and 6) rotating the screw cap which connects the pressure bars, and slowly elevating the pressure bars until the bent GeOI wafer restores to the original state. The invention has the advantages of 1) simple manufacturing technique, 2) fewer manufacturing devices, 3) wide annealing temperature range, 4) high strain effect, 5) favorable thermal properties and 6) low manufacturing cost.

The invention relates to a horizontal static load test device for CT scanning, and a method, and belongs to the technical field of geotechnical engineering and geological engineering testing. The horizontal static load test device in the invention comprises a base, a transparent test box, a servo motor, a transmission device and a vertically arranged model pile; the transparent test box is filledwith a soil sample; a vertically arranged transparent support column is arranged at one side of the transparent test box; the top of the transparent support column is fixedly connected with the servomotor; the output end of the servo motor is fixedly connected with the top of the model pile through the transmission device; multiple strain gages are arranged on the outer wall of the model pile; and a data acquirer is also fixedly arranged at the side edge of the transparent support column. The test device in the invention has the benefits that: the test device can be used for monitoring the horizontal resistance of the soil sample at the side of the model pile and the horizontal load of the model pile, so that a p-y curve is obtained; and, the test device can be used for scanning by beingput on an industrial CT turntable, so that deformation of the soil sample and evolution of a shear zone can be observed.

The invention discloses an integrated air quality induction intelligent constant-temperature ecological curtain wall system and a temperature control method, belongs to the field of curtain walls and solves the problem of high energy consumption of an air conditioning system. Through combination of a computer system and a constant-temperature curtain wall, the curtain wall system has a plurality of operating modes; the system is capable of intelligently choosing and switching the operating modes according to indoor, hollow interlayer and outdoor temperatures and outdoor air quality and intelligently controlling the temperature. Through the integrated air quality induction intelligent constant-temperature ecological curtain wall system, the energy consumption of the air conditioning system in the heating and cooling processes can be reduced; the curtain wall system has an excellent energy-saving effect and high response capacity to environment change.

The invention aims to provide a double-acting normally closed electronic unit pump; the double-acting normally closed electronic unit pump comprises a double-peach cam, a roller plunger, a normally closed fuel oil control valve, a fuel oil line reversing valve and a double oil discharge valve; the normally closed fuel oil control valve is installed above the plunger; the fuel oil line reversing valve is installed above the normally closed fuel control valve; the normally closed fuel oil control valve when not being powered on is in a normally closed state; after the normally closed fuel oil control valve is powered on, an oil drainage path is turned on by an oil drainage cone valve. By the normally closed fuel oil control valve, the supply problem of fuel oil under the conditions that an engine is powered down and the like can be solved; by reconstructing the fuel oil path at the place of the oil drainage cone valve and designing the oil path into a step shape, areas for fuel oil pressure at the two ends of the valve are changed; when an electromagnetic valve breaks down, the oil drainage cone valve is pushed open by the excessive fuel oil pressure, thereby accomplishing oil drainage and pressure releasing functions; by the normally closed fuel oil control valve with a protection device, the stability and the safety of the valve itself are improved and then the reliability of hydraulic devices such as the electronic unit pump and an oil sprayer is improved; the stability of the engine in operation is improved.

The invention discloses a wood processing profiling machine, the structure of which comprises: a processing frame, a power motor, a gantry frame, a mounting frame, a controller, a new fixture, a conveying frame, and a base, and the base is located on the upper surface of the conveying frame and integrated with it The new fixture is set inside the conveyor frame, the processing frame is located on the lower surface of the gantry frame and is integrated with the gantry frame, the mounting frame is located on the right side of the gantry frame and is mechanically connected to it, and the controller is located on the mounting frame. Inside, the power motor is embedded inside the gantry frame, so that the clamping methods of the profiling machine can be diversified, and the device can use a set of transmission structure to control two different clamps, so that the device can be used in the process of It can have better adaptability and installation safety during work, so that the device can be more perfect.

The invention discloses an air induction intelligent constant-temperature ecological lighting ceiling and a temperature control method and belongs to the field of lighting ceilings. The problem of high energy consumption of an air conditioner system is solved. A computer system is combined with the lighting ceiling, so that various working modes are achieved. In addition, the working modes are selected and switched intelligently according to the indoor temperature, the temperature of a hollow interlayer, the outdoor temperature and the outdoor air speed, intelligent temperature control is achieved, energy consumption of the air conditioner system during heating and refrigeration is reduced, and a good energy saving effect and environmental change coping capacity are achieved.

The invention discloses a manufacturing method of a uniaxial strain SGOI (SiGe-on-Insulator) wafer on an SiN buried insulating layer based on a mechanical bending table, and the method comprises the following steps: 1) putting an SGOI wafer on a cambered bending table, wherein the top layer (SiGe layer surface) of the SGOI wafer faces up or down; 2) respectively horizontally putting two cylindrical stainless steel pressure bars on both ends of the SGOI wafer, wherein the two cylindrical stainless steel pressure bars are respectively 1cm away from the edge of the SGOI wafer; 3) slowly rotating a screw cap which connects the pressure bars, so that the SGOI wafer is gradually bent along the cambered table until the SGOI wafer is completely laminated on the cambered table; 4) putting the cambered bending table carrying the SGOI wafer in an annealing furnace, and carrying out annealing; 5) after the annealing finishes, slowly cooling to room temperature, and taking out the cambered bending table carrying the SGOI wafer; and 6) rotating the screw cap which connects the pressure bars, and slowly elevating the pressure bars until the bent SGOI wafer restores to the original state. The method disclosed by the invention has the advantages of 1) favorable thermal properties, 2) high strain effect, 3) small surface roughness, 4) wide annealing temperature range, 5) fewer manufacturing devices which can be self-made, and 6) simple manufacturing technique.

The invention aims at providing a normally closed solenoid valve with a protection device. The normally closed solenoid valve comprises a valve body, a solenoid valve part and an oil drain valve part, wherein the solenoid valve part and the oil drain valve part are both arranged on the valve body; the solenoid valve part comprises a solenoid valve shell, an electromagnetic coil, an armature and a valve rod of the solenoid valve; the electromagnetic coil and the armature are mounted in the solenoid valve shell; the valve rod of the solenoid valve is fixed on the armature; the oil drain valve part comprises an oil drain tapered valve, a connection sleeve, a valve rod of an oil drain valve and an oil drain valve spring; the connection sleeve which is provided with a solenoid valve spring at the outer part is in interference fit with the valve rod of the solenoid valve; the connection sleeve is connected with the oil drain tapered valve; the oil drain tapered valve is connected with the valve rod of the oil drain valve; the valve rod of the oil drain valve is arranged in a valve rod sleeve; an oil drain valve spring sleeves the end part of the valve rod of the oil drain valve; the valve body is provided with an oil feeding oil path and an oil drain oil path; the oil feeding oil path and the valve rod sleeve are mutually crossly arranged; the oil drain oil path is communicated to the position of the solenoid valve spring. By virtue of the normally closed solenoid valve with the protection device, the reliability of an engine can be improved.

The invention relates to the technical field of crop planting and discloses a high-yield and high-efficiency double-cropping rice field planting mode. The high-yield and high-efficiency double-cropping rice field planting mode includes the steps of a, garlic planting in winter, namely performing ditching, bedding, raking, fertilizing and sowing after late rice is harvested every year and carryingout harvest at least 12 days before transplanting early rice in the second year; b, early rice planting, namely performing sowing from March 20 to March 30 every year, transplanting from April 25 to May 5 and harvesting from July 15 to July 25; c, late rice planting, namely performing sowing from June 10 to June 20, transplanting from July 20 to July 30 and harvesting from October 15 to October 25. Planting the garlic during winter leisure in double-cropping rice field can effectively make use of photothermal water resources in the winter of the double-cropping rice field, ensure that the soilis good in condition and avoid reduction of soil fertility and the like caused by the idle in winter to affect planting of subsequent double-season rice, both the economic income of the winter and the yield of the double-cropping rice are increased, and the economic benefit is improved again.

The invention discloses an integrated air quality induction smart thermostat ecological lighting greenhouse and a temperature control method, and belongs to the field of lighting greenhouses. The problem that an existing air conditioner system is high in energy consumption is solved. On the basis of combining a computer system and a lighting greenhouse, various working modes are obtained, working modes are intelligently selected and switched according to indoor hollow interlayers and outdoor temperature and outdoor air quality, smart temperature control is achieved, energy consumption of the air-conditioner system in the heating and refrigerating process is lowered, and the good energy-saving effect and the environmental change dealing capacity are achieved.

The invention provides a method for a manned vehicle to supervise and control obstacle avoidance of an unmanned aerial vehicle (UAV), which relates to the field of UAVs. According to the method, the values of environmental factors, obstacle avoidance actions and supervision and control modes are defined, and a UAV infers and judges optional obstacle avoidance actions and makes judgment according to the judgment result so as to avoid obstacles. For a known obstacle, the UAV gives full play to the autonomous ability to independently avoid the obstacle. For an unknown obstacle, the UAV must be guided by a manned vehicle to avoid the obstacle. The variable autonomous supervision and control method gives full play to the autonomous execution ability of the UAV and the analysis and judgment ability of a manned vehicle operator. In an extreme case such as communication interruption, the UAV ensures its own safety by adjusting the supervision and control mode while waiting for the recovery ofcommunication. The variable autonomous supervision and control mode can well adapt to different types of obstacles and environmental conditions based on the characteristics of UAV and the manned vehicle.

The invention relates to a tank of a tank car. The tank is made from polyurethane. The dead weight of a tank body can be effectively lightened so as to be used for increasing the loading capacity of products and improving the traffic volume under the condition of not changing the aggregate tonnage of the tank car, and therefore, the invention can improve traffic efficiency, reduce traffic cost and save fuels and is also beneficial to environmental protection.