64results about How to "Improve magnetic strength" patented technology

A jewelry-forming component composing a body member having a first magnetized portion and a female element associated therewith for magnetically attracting and receiving a male element of another jewelry-forming component. The first magnetized portion of the body member provides a minimum magnetic strength that is sufficient to retain the male element within the female element and a maximum magnetic strength that can be overcome by a person's hand strength to separate the male and female elements. The female element defines a cavity having a depth sufficient to receive the male element at different positions therein, and this allows relative movement of the male and female elements to assist in providing the self-sizing nature of the article. The body member also includes a further element that is magnetically responsive for magnetically coupling with another jewelry-forming component, such that a plurality of such components can be magnetically coupled to form an article of jewelry.

A magnetic separator for a mineral feed comprising, a rotatable drum having an attraction surface, an inlet for receiving a stream of the mineral feed and directing it past the rotating drum, means for generating a magnetic field to attract magnetic components in the feed to the attraction surface, a first zone for take off of non-magnetic components of the mineral feed, and a second zone for take off of the magnetic components, wherein the magnetic field generating means are adapted to subject the magnetic components to at least one reversal of polarity of the magnetic field as the drum rotates.

An assembly for loading and conveying ferrous metal articles including a magnet having north and south poles, an axis between the north and south poles, the poles forming an annular belt support; a powered conveyor belt extending over the belt support for rotating the magnet, the magnet being segmented along the polar axis, a first polar axis segment being a magnet mounting plate, a plurality of second polar axis segments being sub-magnets, each such sub-magnet overlying or underlying the magnet mounting plate having north and south poles, and having a polar axis, and a third polar axis segment being a sheath extending annularly about the magnet's first and second polar axis segments, the sheath having a radially outer surface forming the magnet's annular belt support.

The invention provides a preparation method of magnetic fluid, comprising: adding excessive alkaline aqueous solution into the aqueous solution containing ferrous ions and ferric ions; processing precipitation reaction under protective gas, separating the products of precipitation reaction to obtain Fe3O4; adding the Fe3O4 and surface active agent into carrier liquid to be heated, separating to obtain the product of heating process, and obtaining magnetic fluid, wherein the mol ratio of the ferrous ions and the ferric ions in the aqueous solution containing ferrous ions and ferric ions is 1.4-1.8: 1. The invention further provides a preparation method of magnetic chitosan microsphere, adopting the magnetic fluid prepared by the aforementioned method. The magnetic chitosan microsphere containing the inventive magnetic fluid is more suitable to be the carrier of immobilized enzymes.

The invention discloses a preparation method of difunctional magnetic fluorescent nanocomposite Fe3O4@CDs microspheres. Core-shell nanocomposite Fe3O4@CDs are synthesized from bottom to top, firstly,a silane reagent (2(aminoethyl)propyltrimethylsilane/3-aminopropyltriethoxysilane) is utilized for modifying and constructing an Fe3O4@SiO2-NH2 core-shell structure, quenching of CDs fluorescence dueto magnetic particles is effectively reduced, and then a magnetic nanocomposite with high fluorescence intensity is prepared from ammonium citrate/citric acid as a carbon source and ethanediamine/triethylene tetramine as a nitrogen source with a one-pot method. The prepared composite is high in magnetic intensity, good in dispersity and excellent in fluorescence properties, and is expected to be widely applied to the fields of environmental governance, targeted therapy, fluorescence labeling and the like.

The invention relates to an iron-remover for filtering iron filings or steel chippings in ceramic slurries, comprising a magnet and a trap positioned within the range of the magnetic field of the magnet, wherein the trap is used to allow the circulation of materials and simultaneously absorb and remove the iron filings in the materials. The iron-remover provided by the invention is characterized in that the a magnetizer with low magnetic resistance is disposed within the magnetic field of the magnet and arranged along the direction of magnetic induction lines; the trap is embedded in the magnetizer. The magnetic field within the magnetizer is distributed more uniformly and then the magnetic field within the trap embedded in the magnetizer is distributed uniformly so as to avoid the uneven distribution of magnetic force. In the meanwhile, as the magnetic resistance of the magnetizer is less than that of air, the loss of magnetic force transmitted within the magnetizer by the magnetic field is decreased. Therefore, the trap has a greater intensity of magnetic force to absorb and remove the iron filings as well as a better effect for removing iron. The electric magnetic iron-removing effect of the trap is improved simultaneously from two aspects. Thus, the iron-removing effect of the whole iron-remover is more reliable.

Magnetic powder includes: at least one epsilon-phase iron oxide-based compound selected from the group consisting of ε-Fe₂O₃ and a compound represented by Formula (1); and a surface treatment layer including a silane compound on at least a part of a surface. The magnetic powder has an average particle diameter of 8 nm to 20 nm. The content ratio of carbon atoms of the silane compound included in the surface treatment layer to iron atoms of the at least one epsilon-phase iron oxide-based compound selected from the group consisting of ε-Fe₂O₃ and the compound represented by Formula (1) is 0.05% to 0.5% in terms of the number of atoms. A manufacturing method thereof and applications thereof are also provided. In Formula (1), A represents at least one metal element other than Fe and a represents a number that satisfies a relationship of 0<a<2.

ε-A_aFe_2-aO₃  (1)

The invention relates to an electric conversion system of a pure electric vehicle and an electric vehicle, wherein the electric conversion system comprises a vehicle body fixing part, a locking mechanism and a controller; the locking mechanism is used for fixing a battery box body and rotationally locking/unlocking the battery box body on the vehicle body fixing part, and the locking mechanism isprovided with two extension shafts extending outwards; magnetic elements are fixed at the near end parts of the two extension shafts, wherein the magnetic pole directions of the magnetic elements areconsistent with the length directions of the extension shafts; a Hall sensor corresponding to the position of the magnetic element when the locking mechanism is in a locked state is arranged on the vehicle body fixing part; the controller acquires a signal of the Hall sensor to detect the locking/unlocking state in real time. According to the electric conversion system of the pure electric vehicle, a driver and passengers can directly obtain the locking and unlocking states of the locking mechanism according to the detection information of the controller, and the driving safety can be guaranteed.

The invention relates to a preparation method of natural fiber compounded magnetic hydrogel, and belongs to the technical field of hydrogel preparation. Soaking by a sodium hydroxide solution is used for weakening the bonding force among fibers; then, steam blasting treatment is used, so that straw fibers are decomposed into monomer fibers and fiber bundles; then, liquid nitrogen is used for fast cooling, so that the fibers subjected to blasting decomposition are frozen; through ball milling treatment, the fibers are broken into nano-scale fibers; then, a polyhydroxyl characteristic of the surfaces of the nano-scale fibers is used; chemical bonds and physical adsorption are formed with magnetized nanometer ferroferric oxide crystals; through ultrasonic dispersion and freezing treatment, the natural fiber compounded magnetic hydrogel in uniform distribution is obtained. The natural fiber compounded magnetic hydrogel prepared by the method has the advantages that the magnetic intensity is high, and can reach 46.6 to 47.8 emu/g; the stretching intensity is good, and can reach 630 to 720kPa.

A transformer includes a magnetic core assembly and a hollow pad. The magnetic core assembly includes a first magnetic part and a second magnetic part. Each of the first magnetic part and the second magnetic part includes a middle post. The hollow pad is arranged between the middle post of the first magnetic part and the middle post of the second magnetic part. The hollow pad has an opening for accommodating a gluing material. The first magnetic part and the second magnetic part are combined together through the gluing material.

The invention relates to a one-pot method for synthesizing a functional carbon-based magnetic solid acid catalyst. According to the invention, nanometer ferroferric oxide, glucose, citric acid, vanillin and hydroxyethyl sulfonic acid are used as raw materials, and a novel one-step hydrothermal precipitation-sulfonation method is adopted for synthesizing the carbon-based magnetic solid acid catalyst C-SO3H@Fe3O4/C. Research results show that the synthesized catalyst has acidity of up to 1.23 mmol/g and magnetic strength of 15.65 Am<2>/kg. When the catalyst is used for hydrolyzing bagasse havingundergone alkali-freezing pretreatment at 180 DEG C, glucose with a yield of 62.59% and total reducing sugar with a yield of 73.01% can be obtained. In addition, the used catalyst can be separated and recovered under the action of an external magnetic field, and the recovery rate of the used catalyst can reach 93.18%. After the catalyst is recycled five times, the catalyst can still catalyze thehydrolysis of the bagasse to obtain glucose with a yield of 54.47% and total reducing sugar with a yield of 60.65% of total reducing sugar. The C-SO3H@Fe3O4/C catalyst provided by the invention can efficiently catalyze the conversion of bagasse into fermentable sugar, and the catalyst shows good catalytic activity and stability.