CN107393381B - A kind of application method of adjustable steady magnetic field experimental provision - Google Patents
A kind of application method of adjustable steady magnetic field experimental provision Download PDFInfo
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- CN107393381B CN107393381B CN201710610305.8A CN201710610305A CN107393381B CN 107393381 B CN107393381 B CN 107393381B CN 201710610305 A CN201710610305 A CN 201710610305A CN 107393381 B CN107393381 B CN 107393381B
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- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
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- G09B23/181—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for electric and magnetic fields; for voltages; for currents
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Abstract
The invention discloses a kind of application methods of adjustable steady magnetic field experimental provision, main flow includes that the model installation of permanent magnet is then selected in the sample stage that sample is put into helix tube, next adjusts the distance between two magnetic poles, sample is finally observed, experimental data is obtained.The present invention can satisfy the experiment of influences principle of the research magnetostatic field for biological cell, can make to test more convenient, while have controllably that multiple variables, the more accurate advantage of experimental data have a wide range of applications in the fields such as biological cell assays.
Description
Technical field
The present invention relates to a kind of application method of novel magnetic experimental provision, specifically a kind of adjustable steady magnetic field experiment
The application method of device.
Background technique
Magnetic field is a kind of special material that cannot be seen or touch.Magnetic field is not and the magnetic field by atom or molecular composition
It is objective reality.Steady magnetic field (static magnetic fields, SMFs): being that magnitude of field intensity is more stable constant
Magnetic field, since its invariable characteristic can be used as biomedical point of penetration.Previous research illustrates stationary magnetic field pair
Different cell has different effects, everything both depends on the size of stationary magnetic field and the type of target cell, and there are also magnetic
The action time etc. of field.In clinical medicine, stationary magnetic field can control the growth of tumour cell and promote bone marrow cell growth.
Influence of the magnetic environment to cell is different, but investigates its essence still by institute's band inside externally-applied magnetic field and cell itself
Certain reaction has occurred between some magnetic field can be to cell change so as to cause magnetic field.Steady magnetic field is to the effect of cell
It is diversified, magnetic field strength, the magnetic field processing magnetic fields factor such as time be influence the biological effects such as cell, bacterium it is main because
Element, the magnetic field in above experiment require a corresponding magnetic field loading device to complete, magnetic required for each is tested
Field intensity difference corresponds to different devices, and current magnetostatic field is control magnetic field strength to most of the research of organism and cell
To complete control experiment.
So, it would be desirable to the steady magnetic field experimental provision and its application method of a controlling magnetic field intensity are designed, to expire
The requirement of the various experiments for needing steady magnetic field of foot.
Summary of the invention
To solve the above problems, the technical solution of the present invention is as follows: a kind of application method of adjustable steady magnetic field experimental provision,
Mainly it is made of pedestal and station two parts.It is characterized by: the pedestal is a horizontal positioned cuboid, rectangular
Two ends of body top surface, symmetrical machining are fixed with fixing seat one and fixing seat two, and two fixing seats are in pedestal cuboid top surface
Above cross section is in rectangle.The inside of two fixing seats, in the horizontal cross of the above rectangular cross section in pedestal cuboid top surface
Central axis on, be symmetrily processed with perforation fixing seat one and fixing seat two mounting hole.The cross section of mounting hole is square
Or it is round, it is straight that square or circular central axis is maintained at a level in the horizontal direction of fixing seat one and fixing seat two
On line.In the central axis horizontal direction of the mounting hole of fixing seat two, it is parallel to base top surface processing and is installed with one towards admittedly
Reservation one, the flat flat rectangular body sample stage of strip.Sample stage can move horizontally installation up and down, guarantee putting examination
After testing sample, the height of sample stage can be adjusted, is in test specimen in the mounting hole water of fixing seat one and fixing seat two
The heart square is upward.Fixing seat one is also machined with a nose bar, the shifting chute essence of nose bar and pedestal below pedestal cuboid top surface
Close fit.Shifting chute is the groove that the horizontal direction in pedestal cuboid, along two both ends of fixing seat one and fixing seat is processed.Nose bar
It is fixedly connected on translation pipe, translation pipe is connected with the motor that moves horizontally in station.In fixing seat one and fixing seat two
Between be also connected with a liquid magnetic helix tube, the circle central axis of liquid magnetic helix tube is overlapped with the central horizontal axis of mounting hole, will
Sample stage packet is in centre.Sample stage is placed at the middle part of helix tube by design, because the magnetic field that helix tube generates has very surely
Fixed feature, so being reached as neutral magnetic field to one stabilization of laboratory sample on sample stage using the magnetic field of helix tube and size can
The magnetostatic field environment of tune.
The station is the hollow truncated rectangular pyramids in monocline face for being provided with button and display screen, is operation with monocline face
The front of platform.In the monocline face left side, button is located on the right of monocline face display location, and pedestal and station weld together as one
A entirety.Consistent, the stabilization of suffered magnetic force of the guarantee sample in magnetic field of axis designs.There is display on design work platform,
The main function of display is to adjust a specific value of distance or the setting of touch screen parameter between the two poles of the earth, and display is right
It is that control platform is moved to the left and moves right respectively while there is button.
The mounting hole of the fixing seat one and fixing seat two is equipped with that pairs of magnetic field strength is consistent, different magnetic field size rule
The permanent magnet of lattice.The outer dimension and mounting hole precision size of permanent magnet cooperate, and permanent magnet can be installed and be moved back in mounting hole
Out.Design achievees the purpose that steady magnetic field is adjustable by the permanent magnet of different magnetic field specification in change mounting hole.Translation pipe
It can be translated back and forth by button or manually in the shifting chute of pedestal, fixing seat one is driven to translate back and forth.Design passes through translation pipe
Change permanent magnet distance in the mounting hole of fixing seat one and fixing seat two, to change the magnetic field strength of steady magnetic field.
The liquid magnetic helix tube is coaxial, the identical straight type cored screw pipe of radius, and liquid magnetic helix tube is internally hollow,
Hollow caliber is divided into 2mm ~ 10mm different size, inside can loading liquid magnetic material, and can be with fixing seat one
Translation is freely stretched and is compressed.Liquid magnetic helix tube has different model according to internal diameter and spirally-wound tubes number.The design of liquid magnetic helix tube
Purpose makes the strength and stability for increasing steady magnetic field, the helix tube of hydraulically full magnetic material, the liquid magnetic material in pipe
It itself is not have magnetic, but liquid under the action of after device both ends have been put into permanent magnet in externally-applied magnetic field in helix tube
Magnetic material has magnetism, generates stable magnetostatic field.Sample stage has different model according to length size, can be according to experiment
Needs, select the sample stage of different length, guarantee that the movement of fixing seat one and fixing seat two is unaffected.
It is characterized in that, application method is as follows:
The first step selects the specification of permanent magnet according to requirement of experiment, and replacement installs permanent magnet, makes fixing seat one and consolidates
The horizontal center line of the permanent magnet of reservation two is on a horizontal linear.Need to select the specification of liquid magnetic helix tube according to experiment,
Replacement installs liquid magnetic helix tube, and adjustment liquid magnetic helix tube makes the central axis of magnetic helix tube, with fixing seat one and fixing seat two
Mounting hole horizontal center line be overlapped.
Second step selects sample stage length specification according to experiment needs, installs sample stage.Test specimen is placed on sample
Behind the middle position of platform, further according to the height for testing sample, the installation of sample stage is adjusted up and down, test specimen is made to be in fixation
In the center line horizontal direction of the mounting hole of seat one and fixing seat two, also on the central axis of liquid magnetic helix tube.
Third step, opening operation platform power supply set experimental period, fixing seat one and fixing seat by button and display screen
Distance parameter between two starts in station and moves horizontally motor, will be between fixing seat one and fixing seat two by translation pipe
Distance is adjusted in desired parameter.Nigration sample again, by test specimen be placed on fixing seat one and fixing seat two it
Between distance mid-point position at.
4th step observes the size in output magnetic field in display screen, confirms that the parameter complication experiment of output is pre- on a display screen
If requirement；Requirement of experiment is not met such as, closes power supply, re-replaces the specification of permanent magnet and liquid magnetic helix tube, repeats to test
Step 1 is to step 4.
5th step, in the case where externally-applied magnetic field has been determined, stabilizing magnetic field caused by the liquid magnetic material in liquid magnetic helix tube
Reach experiment preset value, open experimental period parameter, observes sample, finally obtain data；The prompt terminated according to experimental period,
Power supply is closed, takes sample away.
In above-mentioned technical proposal, the making material of the preferred pedestal is soft magnetic materials；The fixing seat one and fixation
The making material of seat two and testing stand is non-magnetizable material；The hollow truncated rectangular pyramids making material of the station is with electromagnetic shielding
Material, and truncated rectangular pyramids surfaces externally and internally carries out coating for EMI shielding processing.This design ensure that sample stage not by station
The electric field of appliance component influences, and the appliance component in station is not also influenced by the magnetic field of sample stage.
The technology of the present invention feature is that production is simple, easy to operate, and is had professional.The present invention have it is following the utility model has the advantages that
(1) stable magnetic field.Because of the stability with higher of magnetic field caused by helix tube, for what is needed at this stage
High stable perseverance magnetostatic field is extraordinary selection.
(2) experimental precision is good.Selection can be guaranteed outside pulling using liquid magnetic material is filled in hollow helix tube
Add magnetic field rear screw pipe there is no remanent magnetism, the magnetic fields time to laboratory sample can reach point-device control in this way.
Detailed description of the invention
Fig. 1 is simple operations flow diagram of the invention.
Fig. 2 is schematic front view of the invention.
Fig. 3 is left view schematic diagram of the invention.
Fig. 4 is schematic top plan view of the invention.
Fig. 5 is three-dimensional overall schematic of the invention.
Fig. 6 is the end view that fixed block two of the invention faces fixed block one.
Fig. 7 is the schematic top plan view of Fig. 5 of the present invention.
Fig. 8 is pedestal schematic cross-sectional view of the invention.
In figure: 1. liquid magnetic helix tubes；2. fixing seat one；3. fixing seat two；4. translation pipe；5. translating button；6. display screen；
7. pedestal；8. sample stage；9. station；10. mounting hole；11. permanent magnet；12. nose bar；13. shifting chute.
Specific embodiment
The present invention is described further below in conjunction with attached drawing.
Referring to the shape and structure figure of 1 flow chart of attached drawing and Fig. 2 to Fig. 8, a kind of use of adjustable steady magnetic field experimental provision
Method, device are mainly made of pedestal 7 and 9 two parts of station.The pedestal 7 is a horizontal positioned cuboid, in length
Two ends of cube top surface, symmetrical machining are fixed with fixing seat 1 and fixing seat 23, and two fixing seats are in 7 cuboid of pedestal
Cross section more than top surface is in rectangle；The inside of two fixing seats, in the level of the 7 above rectangular cross section in cuboid top surface of pedestal
On lateral central axis, it is symmetrily processed with the mounting hole 10 of perforation fixing seat 1 and fixing seat 23.Mounting hole 10 it is transversal
Face is that square or circle, square or circular central axis are kept in the horizontal direction of fixing seat 1 and fixing seat 23
On a horizontal linear.The mounting hole 10 of the fixing seat 1 and fixing seat 23 be equipped with pairs of magnetic field strength it is consistent,
The permanent magnet of different magnetic field size specification.The outer dimension and 10 precision size of mounting hole of permanent magnet 11 cooperate, 11 energy of permanent magnet
It is enough to install and exit in mounting hole 10.In the central axis horizontal direction of the mounting hole 10 of fixing seat 23, it is parallel to pedestal 7
Top surface processing is installed with one towards fixing seat 1, the flat flat rectangular body sample stage 8 of strip.The sample stage 8 exists
It can be parallel to the central axis of mounting hole 10 in fixing seat 1, move horizontally installation up and down.Sample stage 8 has according to length size
Different model.Fixing seat 1 is also machined with a nose bar 12 below 7 cuboid top surface of pedestal.The movement of nose bar 12 and pedestal 7
13 precision-fit of slot.Shifting chute 13 is that the horizontal direction in 7 cuboid of pedestal, along 23 both ends of fixing seat 1 and fixing seat is processed
Groove.Nose bar 12 is fixedly connected on translation pipe 4, and translation pipe 4 is connected with the motor that moves horizontally in station 9.It is described
Translation pipe 4 can translate back and forth by button 5 or manually in the shifting chute 13 of pedestal 7, and fixing seat 1 is driven to translate back and forth.In
A liquid magnetic helix tube 1, the circle central axis and mounting hole of liquid magnetic helix tube 1 are also connected between fixing seat 1 and fixing seat 23
10 central horizontal axis is overlapped, and sample stage 8 is wrapped in centre.Liquid magnetic helix tube 1 is different according to internal diameter and spirally-wound tubes number
Model.The station 9 is the hollow truncated rectangular pyramids in monocline face for being provided with button 5 and display screen 6, is operation with monocline face
The front of platform 9.Display screen 6 is located at the monocline face left side, and button 5 is located on the right of monocline face, and pedestal 7 welds together with station 9
As an entirety.It is characterized in that, application method is as follows.
The first step selects the specification of permanent magnet 11 according to requirement of experiment, and replacement installs permanent magnet 11, makes fixing seat 1
Horizontal center line with the permanent magnet 11 of fixing seat 23 is on a horizontal linear.It is needed to select liquid magnetic helix tube 1 according to experiment
Specification, replacement installs liquid magnetic helix tube 1, and adjustment liquid magnetic helix tube 1 makes the central axis of magnetic helix tube 1, with fixing seat 1
It is overlapped with the horizontal center line of the mounting hole 10 of fixing seat 23.
Second step selects 8 length specification of sample stage according to experiment needs, installs sample stage 8.Test specimen is placed on sample
Behind the middle position of sample platform 8, further according to the height for testing sample, the installation of sample stage 8 is adjusted up and down, is in test specimen
In the center line horizontal direction of the mounting hole 10 of fixing seat 1 and fixing seat 23, also on the central axis of liquid magnetic helix tube 1.
Third step, 9 power supply of opening operation platform set experimental period, fixing seat 1 by button 5 and display screen 6 and consolidate
Distance parameter between reservation 23 starts in station 9 and moves horizontally motor, by fixing seat 1 and is fixed by translation pipe 4
Distance is adjusted in desired parameter between seat 23.Test specimen is placed on one 2 He of fixing seat by nigration sample again
Between fixing seat 23 at the mid-point position of distance.
4th step observes the size in output magnetic field in display screen 6, the parameter complication experiment of output is confirmed on display screen 6
Preset requirement.Requirement of experiment is not met such as, power supply is closed, re-replaces the specification of permanent magnet 11 and liquid magnetic helix tube 1, is repeated
Experimental procedure one arrives step 4.
5th step, in the case where externally-applied magnetic field has been determined, stabilizing magnetic field caused by the liquid magnetic material in liquid magnetic helix tube 1
Reach experiment preset value, open experimental period parameter, observes sample, finally obtain data.The prompt terminated according to experimental period,
Power supply is closed, takes sample away.
The liquid magnetic helix tube 1 is coaxial, the identical straight type helix tube of radius, what liquid magnetic helix tube 1 was internally hollow, empty
Heart caliber is divided into 2mm ~ 10mm different size, inside can loading liquid magnetic material, and can be flat with fixing seat 1
It is moved from by stretching and compressing.
The making material of the pedestal 7 is soft magnetic materials；The production of the fixing seat 1 and fixing seat 23 and sample stage 8
Material is non-magnetizable material.The hollow truncated rectangular pyramids making material of the station 9 is with electromagnetic shielding material, and in truncated rectangular pyramids
Outer surface carries out coating for EMI shielding processing.
Illustrate: using technical solution of the present invention or those skilled in the art under the inspiration of technical solution of the present invention,
Similar technical solution is designed, and reaches said effect, is to fall into protection scope of the present invention.
Claims (3)
1. a kind of application method of adjustable steady magnetic field experimental provision, device is mainly by pedestal (7) and station (9) two parts group
At；The pedestal (7) is a horizontal positioned cuboid, and in two ends of cuboid top surface, symmetrical machining is fixed with
Reservation one (2) and fixing seat two (3), cross section of two fixing seats more than pedestal (7) cuboid top surface are in rectangle；Two solid
The inside of reservation is symmetrily processed on the central axis of the horizontal cross of the above rectangular cross section in pedestal (7) cuboid top surface
Penetrate through the mounting hole (10) of fixing seat one (2) and fixing seat two (3)；The cross section of mounting hole (10) is square or circle, just
Rectangular or circular central axis is maintained at a horizontal linear in the horizontal direction of fixing seat one (2) and fixing seat two (3)
On；The mounting hole (10) of the fixing seat one (2) and fixing seat two (3) is equipped with that pairs of magnetic field strength is consistent, different magnetic field
The permanent magnet (11) of size specification；The outer dimension and mounting hole (10) precision size of permanent magnet (11) cooperate, permanent magnet (11)
It can install and exit in mounting hole (10)；In the central axis horizontal direction of the mounting hole (10) of fixing seat two (3), in parallel
In pedestal (7) top surface, processing is installed with one towards fixing seat one (2), the flat flat rectangular body sample stage (8) of strip；
The sample stage (8) can be parallel to the central axis of mounting hole (10) in fixing seat one (2), move horizontally installation, sample up and down
Sample platform (8) has different model according to length size；Fixing seat one (2) is also machined with one below pedestal (7) cuboid top surface
Nose bar (12), shifting chute (13) precision-fit of nose bar (12) and pedestal (7)；Shifting chute (13) is edge in pedestal (7) cuboid
The groove of fixing seat one (2) and the processing of the horizontal direction at fixing seat two (3) both ends；Nose bar (12) is fixedly connected on translation pipe (4)
On, translation pipe (4) is connected with the motor that moves horizontally in station (9)；Translation pipe (4) can by button (5) or
The shifting chute (13) in pedestal (7) translates back and forth manually, and fixing seat one (2) is driven to translate back and forth；In fixing seat one (2) and fix
Seat is also connected with a liquid magnetic helix tube (1) between two (3), in the circle central axis of liquid magnetic helix tube (1) and mounting hole (10)
Heart horizontal axis is overlapped, and sample stage (8) are wrapped in centre；Liquid magnetic helix tube (1) has different shaped according to internal diameter and spirally-wound tubes number
Number；The station (9) is the hollow truncated rectangular pyramids in monocline face for being provided with button (5) and display screen (6), is with monocline face
The front of station (9)；Display screen (6) is located at the monocline face left side, and button (5) is located on the right of monocline face, pedestal (7) and station
(9) weld together as an entirety；It is characterized in that, application method is as follows:
The first step selects the specification of permanent magnet (11) according to requirement of experiment, and replacement installs permanent magnet (11), makes fixing seat one
(2) and the horizontal center line of the permanent magnet of fixing seat two (3) (11) is on a horizontal linear；It is needed to select liquid magnetic according to experiment
The specification of helix tube (1), replacement install liquid magnetic helix tube (1), and adjustment liquid magnetic helix tube (1) makes the center of magnetic helix tube (1)
Axis is overlapped with the horizontal center line of fixing seat one (2) and the mounting hole (10) of fixing seat two (3)；
Second step selects sample stage (8) length specification according to experiment needs, installs sample stage (8)；Test specimen is placed on sample
Behind the middle position of sample platform (8), further according to the height for testing sample, the installation of sample stage (8) is adjusted up and down, makes test specimen
It is in the center line horizontal direction of the mounting hole (10) of fixing seat one (2) and fixing seat two (3), also in liquid magnetic helix tube (1)
Central axis on；
Third step, opening operation platform (9) power supply set experimental period, fixing seat one (2) by button (5) and display screen (6)
The distance parameter between fixing seat two (3) starts in station (9) and moves horizontally motor, manages (4) for fixing seat by translation
Distance is adjusted in desired parameter between one (2) and fixing seat two (3)；Nigration sample again places test specimen
Between fixing seat one (2) and fixing seat two (3) at the mid-point position of distance；
4th step observes the size in output magnetic field in display screen (6), the parameter complication experiment of output is confirmed on display screen (6)
Preset requirement；Requirement of experiment is not met such as, is closed power supply, is re-replaced the specification of permanent magnet (11) and liquid magnetic helix tube (1),
It repeats experimental procedure one and arrives step 4；
5th step, in the case where externally-applied magnetic field has been determined, stabilizing magnetic field caused by the liquid magnetic material in liquid magnetic helix tube (1) reaches
To experiment preset value, experimental period parameter is opened, sample is observed, finally obtains data；The prompt terminated according to experimental period is closed
Power supply is closed, takes sample away.
2. a kind of application method of adjustable steady magnetic field experimental provision according to claim 1, it is characterised in that: the liquid
Magnetic helix tube (1) is coaxial, the identical straight type helix tube of radius, what liquid magnetic helix tube (1) was internally hollow, and hollow caliber is divided into
2mm ~ 10mm different size, inside can loading liquid magnetic material, and can freely be drawn with the translation of fixing seat one (2)
It stretches and compresses.
3. a kind of application method of adjustable steady magnetic field experimental provision according to claim 1, it is characterised in that: the bottom
The making material of seat (7) is soft magnetic materials；The making material of the fixing seat one (2) and fixing seat two (3) and sample stage (8) is
Non-magnetizable material；The hollow truncated rectangular pyramids making material of the station (9) is and the appearance in truncated rectangular pyramids with electromagnetic shielding material
Face carries out coating for EMI shielding processing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710610305.8A CN107393381B (en) | 2017-07-25 | 2017-07-25 | A kind of application method of adjustable steady magnetic field experimental provision |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710610305.8A CN107393381B (en) | 2017-07-25 | 2017-07-25 | A kind of application method of adjustable steady magnetic field experimental provision |
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| CN107393381A CN107393381A (en) | 2017-11-24 |
| CN107393381B true CN107393381B (en) | 2019-11-26 |
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| CN1319029A (en) * | 1999-08-07 | 2001-10-24 | Mfh控制体温系统有限公司 | Magnetic field applicator for heating magnetic or magnetizable substances or solids in biological tissue |
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| WO2005065267A2 (en) * | 2003-12-24 | 2005-07-21 | Massachusetts Institute Of Technology | Magnetophoretic cell clarification |
| CN1843957A (en) * | 2005-04-08 | 2006-10-11 | 近藤信一 | Magnet processing apparatus |
| CN101303423A (en) * | 2008-03-27 | 2008-11-12 | 上海理工大学 | Magnetofluid grating |
| CN202047072U (en) * | 2011-04-20 | 2011-11-23 | 四川大学 | Cell loading device with static magnetic field |
| CN106710393A (en) * | 2017-01-01 | 2017-05-24 | 重庆科技学院 | Miniature static magnetic field experiment device |
| CN106876087A (en) * | 2017-03-17 | 2017-06-20 | 云南靖创液态金属热控技术研发有限公司 | A kind of close-coupled high-intensity magnetic field generating means |
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2017
- 2017-07-25 CN CN201710610305.8A patent/CN107393381B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1319029A (en) * | 1999-08-07 | 2001-10-24 | Mfh控制体温系统有限公司 | Magnetic field applicator for heating magnetic or magnetizable substances or solids in biological tissue |
| CN1402833A (en) * | 1999-11-30 | 2003-03-12 | 量子设计公司 | Method and apparatus for making measurements of accumulations of magnetic particles |
| WO2005065267A2 (en) * | 2003-12-24 | 2005-07-21 | Massachusetts Institute Of Technology | Magnetophoretic cell clarification |
| CN1843957A (en) * | 2005-04-08 | 2006-10-11 | 近藤信一 | Magnet processing apparatus |
| CN101303423A (en) * | 2008-03-27 | 2008-11-12 | 上海理工大学 | Magnetofluid grating |
| CN202047072U (en) * | 2011-04-20 | 2011-11-23 | 四川大学 | Cell loading device with static magnetic field |
| CN106710393A (en) * | 2017-01-01 | 2017-05-24 | 重庆科技学院 | Miniature static magnetic field experiment device |
| CN106876087A (en) * | 2017-03-17 | 2017-06-20 | 云南靖创液态金属热控技术研发有限公司 | A kind of close-coupled high-intensity magnetic field generating means |
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| CN107393381A (en) | 2017-11-24 |
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Inventor after: Liao Xiaoling Inventor after: Xu Wenfeng Inventor after: Yang Mei Inventor after: Xia Yiyu Inventor before: Xu Wenfeng Inventor before: Liao Xiaoling Inventor before: Xia Yiyu Inventor before: Yang Mei |
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