mining Periodic magnetic field

A regular period for Saturn's magnetic field that may track …

We note that local spin-periodic magnetic field perturbations observed in some of the Pioneer and Voyager data were explained via a 'camshaft' model, which proposed that a hypothetical anomaly ...

Giant Periodic Pseudomagnetic Fields in Strained Kagome …

Quantum materials, particularly Dirac materials with linearly dispersing bands, can be effectively tuned by strain-induced lattice distortions leading to a pseudomagnetic field that strongly modulates their electronic properties. Here, we grow kagome magnet FeSn films, consisting of alternatingly stacked Sn2 honeycomb …

A New Method to Focus SEBs Using the Periodic …

In this paper, a novel method, named PM-E, to focus the sheet electron beam (SEB) is proposed. This new method consists of a …

Numerical Study of Periodic Magnetic Field …

It is found that oscillation period, the magnitude of the magnetic field, and adding nanoparticles have an important effect on heat transfer, temperature field, and flow structure. In this paper, a numerical …

A hysteretic periodic magnetic field solution using Preisach …

The paper presents a computational approach for periodic magnetic field problems including hysteresis. The procedure is based on the finite element method combining scalar Preisach model with Fixed Point technique. The computational scheme is applied to a one-dimensional model problem. The results are validated by comparison with the exact …

CVD Diamond Growth Enhanced by a Dynamic Magnetic Field …

A dynamic magnetic field (DMF) with different angular frequencies (50, 100, and 150 π rad/s) was introduced during diamond growth via hot filament chemical vapor deposition (HFCVD). The effects of the dynamic magnetic field on the growth rate, diamond quality, growth orientation, and deposition uniformity of large-area diamond …

21.1: Magnetism and Magnetic Fields

These effects can be combined into a partial differential equation called the magnetic induction equation: ∂B ∂t = η∇2B +∇ × (u ×B) (21.1.7) (21.1.7) ∂ B ∂ t = η ∇ 2 B + ∇ × ( u × B) In this equation u is the velocity of the fluid, B is the magnetic field, and eta is the magnetic diffusivity. The first term on the right ...

What causes the periodic reversals of the earth's magnetic field…

"The dipole part of the field is usually aligned fairly closely with the Earth's rotation axis; in other words, the magnetic poles are usually fairly close to the geographic poles, which is why a ...

A periodic magnetic field assisted chemical vapor deposition technique

The morphology of samples was characterized by field emission scanning electron microscopy (SEM: FEI Sirion200). The quality of diamond films was investigated by a micro-Raman spectrometer (Lab Raman HR800), at an excitation wavelength of 488 nm (argon ion laser) with a power of 10 mW.The preferential orientation of films was …

The effect of periodic magnetic field on the …

Periodic magnetic field was used to deposit nano-diamond film. •. Magnetic field angular frequency has influence on nano-diamond preparation. •. High …

A New Method to Focus SEBs Using the Periodic …

Kobe 6500023, Japan; dazhi_li@hotmail. Abstract: In this paper, a novel method, named PM-E, to focus the sheet electron beam (SEB) is proposed. This new method consists of a periodic magnetic field and an electrostatic field, which are used to control the thickness and width of the SEB, respectively.

Magnetite | Common Minerals

Magnetite is a black, opaque, magnetic mineral that leaves a black streak when rubbed across a hard rough surface. It is one of the most abundant metal oxides, and its crystal structure contains both the ferrous (Fe+2) and ferric (Fe+3) forms of iron ions. A complex pattern of electrons between the two forms of iron is the source of its ...

Magnetic Survey

Magnetic Survey - Mining Fundamentals. A magnetic survey is one of the exploration tools used for measuring localized changes in the Earth's magnetic field, caused by sedimentary rocks or mineral ore bodies. The magnetic properties of mineral ore bodies and igneous rocks allow them to be easily identified and mapped, via magnetic surveys.

Structure and magnetic field of periodic permanent magnetic focusing

Research highlights For open magnetic rings, both calculated and measured results show that the existence of the radial magnetic field creates a remarkable cosine distribution field along the central axis. A new structure of periodic permanent magnet (PPM) focusing system with open magnetic rings is proposed. The new PPM focusing …

Magnetic Separation | SpringerLink

Magnetic separation is widely used. All materials with magnetism in the magnetic field can be treated by magnetic separation, which is the main method to treat iron ore. All lean magnetite ores need to remove gangue minerals such as quartz through weakly magnetic field magnetic separators to improve the iron grade of concentrate. …

Magnetic Susceptibility

Magnetic Susceptibility - Mining Fundamentals. Magnetic susceptibility is a measure of the ability of a substance to be magnetized in the presence of an external magnetic field. In principle, magnetic susceptibility measurement is based on the amount and type of magnetic minerals within the rocks. In cases of positive magnetic susceptibility ...

Two-dimensional electron gas in a periodic magnetic …

We study the energy spectrum and electronic properties of a two-dimensional (2D) spinless electron gas in a periodic magnetic field which has the …

Perspectives on Permanent Magnetic Materials for …

The magnetic anisotropy field H K defines the strength of magnetic field necessary to direct magnetization in a unit cell from a …

21.5: Magnetic Fields, Magnetic Forces, and Conductors

magnetic field: A condition in the space around a magnet or electric current in which there is a detectable magnetic force, and where two magnetic poles are present. electric field: A region of space around a charged particle, or between two voltages; it exerts a force on charged objects in its vicinity.

Modification of polycrystalline nanodiamonds by using periodic magnetic …

Here, we report a new approach to the modification of nanodiamonds by periodic magnetic field (PMF) enhanced hydrogen plasma. The rotating magnetic field can improve the spatial distribution of hydrogen plasma and keep charged particles in the plasma away from the vacuum chamber wall [13] .

Electrons in a periodic magnetic field

The miniband Aharonov-Bohm oscillations and the interminiband absorption coefficient have been considered theoretically for one-layer superlattices of square and rectangular symmetries, composed of cylindrical quantum rings in the external transverse magnetic field with a periodic vector potential by the lattice constants.

Giant magnetoresistance and possible miniband effects in periodic …

We have investigated the magnetoresistance (MR) of high mobility, near surface two-dimensional electron gases that are subject to a periodic magnetic field of amplitude up to 0.3 T. The fields are produced by sub-micron arrays of ferromagnetic stripes on the surface of the heterostructures. For small applied external magnetic fields …

Impact of Non-Uniform Periodic Magnetic Field on …

The magnetic field is useful in material processes, heat exchangers, and various scientific research. The periodic magnetic field can create a periodic force. This periodic magnetic field is used in …

Phys. Rev. E 80, 026314 (2009)

We have investigated the influence of a time-periodic and spatially homogeneous magnetic field on the linear stability properties and on the nonlinear response of a ferrofluid layer heated from below and from above. A competition between stabilizing thermal and viscous diffusion and destabilizing buoyancy and Kelvin forces …

Periodic magnetic modulation enhanced electrochemical …

Setup of the periodic magnetic field modulation prototype. Periodic movement of MBs was controlled by the external magnetic field with switchable features, alternately generated by a pair of strong neodymium disc magnets (diameter 6 mm × thick 0.8 mm, Magpanda Science and Technology Ltd., Ningbo, China).

Magnetic Susceptibility

Magnetic susceptibility is a measure of the ability of a substance to be magnetized in the presence of an external magnetic field. In principle, magnetic susceptibility …

Improvement of unidirectional focusing periodic

Since the permanent magnet has a thickness h, in order to simplify the analysis process, the center of the lower surface of the permanent magnet can be regarded as the rotation axis.Then an angled bias magnetic field varies with the increase in the rotation angle φ of the periodic permanent magnet. Since the eddy current on the …

Natural convection of a hybrid nanofluid affected by an …

The hybrid nanofluid filling the cavity is Ag–MgO hybrid nanoparticles with water as a base fluid. The magnetic field is exerted on the entire flow domain. The characteristics of a periodic magnetic field are period 2λ and amplitude B 0. Buoyancy forces induced by the temperature difference between two opposite vertical borders are …

Large-area, periodic, and tunable intrinsic pseudo-magnetic fields …

Here, the authors report experimental tuning of large area periodic pseudo-magnetic fields within twisted bilayer graphene and massive Dirac electrons having circularly localized pseudo-Landau levels.

Generation of Periodic Magnetic Field Using Bulk …

Abstract: The generation of strong periodic magnetic fields with short periodic lengths is very attractive for accelerator-based compact high-power future light sources. We have developed a new type of undulator using HTS bulk material to …