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相关概念视频

Magnetism01:30

Magnetism

6.3K
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
6.3K
Magnetic Damping01:17

Magnetic Damping

437
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
437
Ferromagnetism01:31

Ferromagnetism

2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
Diamagnetism01:26

Diamagnetism

2.4K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.4K
Paramagnetism01:30

Paramagnetism

2.5K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.5K
Eddy Currents01:25

Eddy Currents

1.5K
Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
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相关实验视频

Updated: Jun 15, 2025

Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish
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Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish

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磁是一个磁.

E Nasr1, S C Wimbush1, P Noonan1

  • 1United Kingdom Atomic Energy Authority, Culham Campus, Abingdon, Oxfordshire OX14 3DB, UK.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
|August 26, 2024
PubMed
概括
此摘要是机器生成的。

用于能源生产的球形托卡马克 (STEP) 使用高温超导体 (HTS) 进行具有挑战性的圆形场线圈. 研究重点是火保护和确保核聚变反应堆环境中的HTS耐用性.

关键词:
在HTS中,HTS就是HTS.在REBCO,你会得到更多.一步一步一步一步一步.磁铁 磁铁 磁铁 磁铁 磁铁 是一个火灭 火灭超导体是一种超导体.

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A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries
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相关实验视频

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Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish
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A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries
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科学领域:

  • 核聚变工程 核聚变工程
  • 材料科学 材料科学 材料科学

背景情况:

  • 能源生产的球形托卡马克 (STEP) 项目需要先进的高场磁铁设计.
  • 基于REBCO的高温超导体 (HTS) 对于使可拆卸的 toroidal field (TF) 线圈至关重要,支持 STEP 的垂直维护策略.

研究的目的:

  • 解决与 STEP 中的 TF 线圈相关的挑战,包括可拆卸的接头,高储能和空间限制.
  • 研究TF线圈的被动火保护策略,以限制终端电压.
  • 为了评估内部线圈结构的结构完整性和HTS材料的辐射耐受性.

主要方法:

  • 开发被动灭保护,依赖于内部线圈电阻和主动供电加热器.
  • 分析了在各种条件下应力和偏移的概念前的线圈间结构.
  • 进行对玛辐射对HTS电流承载能力的影响的初步实验.
  • 启动实验计划,将HTS冷辐射到与聚变相关的流动,并使用氧离子作为中子对应物.

主要成果:

  • 通过调整线圈电阻和使用主动供电加热器,可以实现被动火保护.
  • 概念前的线圈间结构在稳定状态和初步故障条件下显示了可接受的性能.
  • 即时的马辐射不会对HTS电流承载能力产生负面影响.

结论:

  • 由于HTS要求和操作约束,STEP的TF线圈的设计存在重大挑战.
  • 被动火保护策略在管理TF线圈安全方面表现有前途.
  • 确保HTS材料的长期辐射耐受性对于在核聚变反应堆中实现商业上相关的磁体寿命至关重要.