The Earth’s Magnetic Field in the Space Age: An Introduction to Terrestrial Magnetism

Hulot, Gauthier; Balogh, A.; Christensen, Ulrich R.; Constable, Catherine; Mandea, Mioara; Olsen, Nils

doi:10.1007/s11214-010-9703-6

Cited by 4 publications

(2 citation statements)

References 46 publications

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“…Also, we calculated in MATLAB and FEMM (Finite element method open-source software, USA) the minimal distance necessary to stimulate different culture wells simultaneously without interference between adjacent magnetic fields. Results show that at 85 mm distance between the two target tissues the influence of the adjacent magnetic fields was negligible (<11 μT) being less than the earth’s magnetic field (25–65 μT; Hulot et al, 2010). Hence, two explants cultured in diametrically opposite wells within one plate, could be stimulated simultaneously to increase throughput of different stimulation parameters ( Figure 1A ).…”

Section: Methods and Results: Stimulation Device Design Constructionmentioning

confidence: 95%

In vitro Magnetic Stimulation: A Simple Stimulation Device to Deliver Defined Low Intensity Electromagnetic Fields

Grehl

Martina

Goyenvalle

et al. 2016

Front. Neural Circuits

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Non-invasive brain stimulation (NIBS) by electromagnetic fields appears to benefit human neurological and psychiatric conditions, although the optimal stimulation parameters and underlying mechanisms remain unclear. Although, in vitro studies have begun to elucidate cellular mechanisms, stimulation is delivered by a range of coils (from commercially available human stimulation coils to laboratory-built circuits) so that the electromagnetic fields induced within the tissue to produce the reported effects are ill-defined. Here, we develop a simple in vitro stimulation device with plug-and-play features that allow delivery of a range of stimulation parameters. We chose to test low intensity repetitive magnetic stimulation (LI-rMS) delivered at three frequencies to hindbrain explant cultures containing the olivocerebellar pathway. We used computational modeling to define the parameters of a stimulation circuit and coil that deliver a unidirectional homogeneous magnetic field of known intensity and direction, and therefore a predictable electric field, to the target. We built the coil to be compatible with culture requirements: stimulation within an incubator; a flat surface allowing consistent position and magnetic field direction; location outside the culture plate to maintain sterility and no heating or vibration. Measurements at the explant confirmed the induced magnetic field was homogenous and matched the simulation results. To validate our system we investigated biological effects following LI-rMS at 1 Hz, 10 Hz and biomimetic high frequency, which we have previously shown induces neural circuit reorganization. We found that gene expression was modified by LI-rMS in a frequency-related manner. Four hours after a single 10-min stimulation session, the number of c-fos positive cells increased, indicating that our stimulation activated the tissue. Also, after 14 days of LI-rMS, the expression of genes normally present in the tissue was differentially modified according to the stimulation delivered. Thus we describe a simple magnetic stimulation device that delivers defined stimulation parameters to different neural systems in vitro. Such devices are essential to further understanding of the fundamental effects of magnetic stimulation on biological tissue and optimize therapeutic application of human NIBS.

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Section: Methods and Results: Stimulation Device Design Constructionmentioning

confidence: 95%

In vitro Magnetic Stimulation: A Simple Stimulation Device to Deliver Defined Low Intensity Electromagnetic Fields

Grehl

Martina

Goyenvalle

et al. 2016

Front. Neural Circuits

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“…The measured magnetic field H m is mainly composed of the main magnetic field of the earth and abnormal magnetic fields generated by magnetic objects [19]. The main magnetic field of the earth H e is distributed uniformly.…”

Section: Composition Of the Measured Magnetic Fieldmentioning

confidence: 99%

Feasibility Analysis of Magnetic Navigation for Vehicles

Huang

et al. 2019

Sensors

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Magnetic navigation is a promising positioning technique for scenarios where a global navigation satellite system (GNSS) is unavailable, such as for underwater submarines and aircraft in space. For ground scenarios, it faces more challenges, since the magnetic distribution suffers interference from surrounding objects such as buildings, bridges, and vehicles. It is natural to think how feasible it is to apply magnetic matching positioning to vehicles. In this paper, a theoretic distribution model is proposed to analyze the magnetic field around objects such as buildings, bridges, and vehicles. According to the experiments, it is shown that the proposed model matches the experimental data well. In addition, a comprehensive indicator metric is defined in this paper to describe the feasibility of the magnetic matching method based on the statistical characteristics of magnetic maps. The best length of matching window, anti-noise performance, and pre-comparison of positioning accuracy in different regions can be easily derived using the proposed comprehensive indicator metric. Finally, the metric is verified through a drive test using different building densities.

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Variability of the 0–3 Ma palaeomagnetic field observed from the Boring Volcanic Field of the Pacific Northwest

Lhuillier

Щербаков

Gilder

et al. 2017

Geophysical Journal International

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The Earth’s Magnetic Field in the Space Age: An Introduction to Terrestrial Magnetism

Abstract: . Focussing on the (still very broad) topic of Terrestrial Magnetism, this workshop was the last of a series of three that aimed to present, discuss and summarize recent advances in our understanding of magnetic fields in the solar system. The earlier workshops, on solar and on planetary

Cited by 4 publications

References 46 publications

In vitro Magnetic Stimulation: A Simple Stimulation Device to Deliver Defined Low Intensity Electromagnetic Fields

In vitro Magnetic Stimulation: A Simple Stimulation Device to Deliver Defined Low Intensity Electromagnetic Fields

Feasibility Analysis of Magnetic Navigation for Vehicles

Variability of the 0–3 Ma palaeomagnetic field observed from the Boring Volcanic Field of the Pacific Northwest

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