Results 91 to 100 of about 6,198 (204)

Automatic Spatial Calibration of Ultra-Low-Field MRI for High-Accuracy Hybrid MEG--MRI

, 2019
With a hybrid MEG--MRI device that uses the same sensors for both modalities, the co-registration of MRI and MEG data can be replaced by an automatic calibration step. Based on the highly accurate signal model of ultra-low-field (ULF) MRI, we introduce a
Ilmoniemi, Risto J., Mäkinen, Antti J., Zevenhoven, Koos C. J.   +2 more
core   +1 more source

The Search-coil Magnetometer for the THOR mission

, 2016
Turbulence Heating ObserveR (THOR) is the first mission ever flown in space fully dedicated to plasma turbulence. The search-coil magnetometer (SCM) of THOR is a triaxial dual-band antenna dedicated to measuring the magnetic field fluctuations in the frequency range [1Hz,4kHz] and [1,200]kHz.
Sahraoui, Fouad, Pinçon, J.-L., Jannet, Guillaume, Mansour, Malik, Henri, Pierre, Chalumeau, Gilles, Hachemi, Tedjani, Jeandet, A., Briand, Nicolas, Le Contel, Olivier, Rezeau, Laurence   +10 more
openaire   +3 more sources

Limits on new long range nuclear spin-dependent forces set with a K-3He co-magnetometer

, 2010
A magnetometer using spin-polarized K and $^3$He atoms occupying the same volume is used to search for anomalous nuclear spin-dependent forces generated by a separate $^3$He spin source.
G. Vasilakis, J. M. Brown, M. V. Romalis, T. W. Kornack, V. F. Bobrakov   +4 more
core   +1 more source

Retrospective Study on Seismic Ionospheric Anomalies Based on Five-Year Observations from CSES

Remote Sensing
The China Seismo-Electromagnetic Satellite (CSES-01) is the first satellite of the space-based observational platform for the earthquake (EQ) monitoring system in China.
Rui Yan, Jianping Huang, Jian Lin, Qiao Wang, Zhenxia Zhang, Yanyan Yang, Wei Chu, Dapeng Liu, Song Xu, Hengxin Lu, Weixing Pu, Lu Wang, Na Zhou, Wenjing Li, Qiao Tan, Zeren Zhima   +15 more
doaj   +1 more source

A Closer Cooperation between Space and Seismology Communities – a Way to Avoid Errors in Hunting for Earthquake Precursors

Russian Journal of Earth Sciences
The space physicists and the earthquake (EQ) prediction community exploit the same instruments – magnetometers, but for different tasks: space physicists try to comprehend the global electrodynamics of near-Earth space on various time scales, whereas the
Pilipenko Vyacheslav, Shiokawa K.
doaj   +1 more source

改进YOLOv5的闪电哨声波轻量化自动检测模型

Kongjian kexue xuebao
提出一种改进YOLOv5(You-Only-Look-Once version 5)检测模型YOLOv5-Upgraded. 为了更快定位真实边框, 该模型将损失函数CIoU (Complete IoU)替换为SIoU(Scylla IoU); 同时为了避免网络训练过程中梯度消失、梯度爆炸以及神经元坏死等现象, 将激活函数SiLU(Sigmoid-weighted Linear Unit)替换为具有更好梯度流的Mish; 在主干网络中插入注意力 (Coordinate Attention, CA)机制,
路 超, 泽仁 志玛, 杨 德贺, 孙 晓英, 吕 访贤, 冉 子霖, 申 旭辉   +6 more
doaj   +1 more source

Investigation of Noise Reduction and SNR Enhancement in Search Coil Magnetometers at Low Frequencies

, 2014
Here, a generalized induction coil sensor model, more generalized than other models, has been considered and the equivalent magnetic field of the coil thermal noise and the sensor signal to noise ratio are calculated theoretically based on the dimensions and geometry of the coil winding and its core.
Nourmohammadi, Abolghasem, Feiz, Seyed Mohammad Hassan, Asteraki, Mohammad Hassan   +2 more
openaire   +2 more sources

Vector magnetometer design study: Analysis of a triaxial fluxgate sensor design demonstrates that all MAGSAT Vector Magnetometer specifications can be met [PDF]

The design of the vector magnetometer selected for analysis is capable of exceeding the required accuracy of 5 gamma per vector field component. The principal elements that assure this performance level are very low power dissipation triaxial feedback ...
Adams, D. F., Hartmann, U. G., Lazarow, L. L., Maloy, J. O., Mohler, G. W.   +4 more
core   +1 more source

Differential Search Coils Based Magnetometers: Conditioning, Magnetic Sensitivity, Spatial Resolution

, 2012
A theoretical and experimental comparison of optimized search coils based magnetometers, operating either in the Flux mode or in the classical Lenz-Faraday mode, is presented. The improvements provided by the Flux mode in terms of bandwidth and measuring range of the sensor are detailed. Theory, SPICE model and measurements are in good agreement.
Timofeeva, Maria, Allègre, Gilles, Robbes, Didier, Flament, Stéphane   +3 more
openaire   +1 more source

Feasibility of hydromagnetic wave measurements on space shuttle [PDF]

The feasibility of using a hydromagnetic wave sensor on the space shuttles was investigated. It was found that although existing sensors are inadequate in terms of resolution, dynamic range, and frequency range, they can be modified to make the necessary
Mcpherron, R. L.
core   +1 more source