Sintered Ndfeb Magnet,Block Sintered Ndfeb Magnets,Strong Sintered Ndfeb Magnet,Rectangular Magnets,Ndfeb Magnet Jinyu Magnet (Ningbo) Co., Ltd. , http://www.magnetbonwin.com
Most vegetables have short growth period and serious pests and diseases. They need to be applied several times during the planting process, and the picking interval is short after application, so that excessive pesticide residues in vegetables are inevitable. When the pesticide remains in the human body to a certain amount, various diseases may occur.
Four simple methods for removing residual pesticides are provided below.
1) Soaking water washing method. This method is applicable to leafy vegetables. You can rinse off the surface dirt with water first, then soak it in water for not less than 10 minutes. The pesticides are mainly organophosphorus pesticides, which are hardly soluble in water. When soaking, you can add fruit and vegetable cleaning agents. Dissolve the pesticide, rinse it with water after soaking.
2) Alkaline water soaking method. Organophosphorus pesticides decompose rapidly under alkaline conditions, so the fruit vegetables can be soaked in alkaline water for 5-15 minutes, which will effectively remove residual pesticides.
3) Peeling method. There are many pesticide residues on the surface of vegetable fruits, so peeling off the skin can effectively remove residual pesticides.
4) Heating method: Carbamate insecticides decompose faster with increasing temperature, so this method can be used for vegetables such as celery, spinach, pakchoi, and beans. Boil the vegetables in boiling water for 2-4 minutes, then rinse with water.
Luonan County Plant Protection Station Qu Junxia
Sintered NdFeB magnets are prepared by the raw materials being melted in a furnace, cast into a mold and cooled to form ingots. The ingots are pulverized and milled; the powder is then sintered into dense blocks. The blocks are then heat-treated, cut to shape, surface treated and magnetized.
As of 2012, 50,000 tons of neodymium magnets are produced officially each year in China, and 80,000 tons in a "company-by-company" build-up done in 2013. China produces more than 95% of rare earth elements, and produces about 76% of the world's total rare-earth magnets.
Neodymium magnets are graded according to their maximum energy product, which relates to the magnetic flux output per unit volume. Higher values indicate stronger magnets and range from N35 up to N52. Letters following the grade indicate maximum operating temperatures (often the Curie temperature), which range from M (up to 100 °C) to EH (200 °C).
Sintered Nd2Fe14B tends to be vulnerable to corrosion, especially along grain boundaries of a sintered magnet. This type of corrosion can cause serious deterioration, including crumbling of a magnet into a powder of small magnetic particles, or spallingof a surface layer.
This vulnerability is addressed in many commercial products by adding a protective coating to prevent exposure to the atmosphere. Nickel plating or two-layered copper-nickel plating are the standard methods, although plating with other metals, or polymer and lacquer protective coatings are also in use.
Neodymium magnets have replaced alnico and ferrite magnets in many of the myriad applications in modern technology where strong permanent magnets are required, because their greater strength allows the use of smaller, lighter magnets for a given application. Some examples are:
ï‚·Head actuators for computer hard disks
ï‚·Magnetic resonance imaging (MRI)
ï‚·Mechanical e-cigarette firing switches
ï‚·Locks for doors
ï‚·Loudspeakers and headphones
ï‚·Magnetic bearings and couplings
ï‚·Electric motors:
ï‚·Cordless tools
ï‚·Servomotors
ï‚·Lifting and compressor motors
ï‚·Synchronous motors
ï‚·Spindle and stepper motors
ï‚·Electrical power steering
ï‚·Drive motors for hybrid and electric vehicles. The electric motors of each Toyota Prius require 1 kilogram (2.2 pounds) of neodymium.
ï‚·Actuators
ï‚·Electric generators for wind turbines (only those with permanent magnet excitation)
ï‚·Direct-drive wind turbines require c. 600 kg of PM material per megawatt
ï‚·Turbines using gears require less PM material per megawatt
ï‚·Toys
Four methods to remove pesticide residues from fruits and vegetables
After the pesticides on the fruits and vegetables are eaten by humans, they are easy to accumulate in the body. When the accumulation reaches a certain level, it will cause chronic poisoning. Therefore, the residual pesticides must be completely removed before eating fruits and vegetables.
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