Today, it is difficult to have a high-field nuclear magnetic resonance (NMR) device due to the high cost of its acquisition and maintenance. These high-end machines require significant space and specialist personnel for operation and offer exceptional quality in the acquisition, processing, and other advanced functions associated with detected signals. However, alternative devices are low-field nuclear magnetic resonance devices. They benefit from the elimination of high-tech components that generate static magnetic fields and advanced instruments. Instead, they used magnetic fields induced by ordinary conductors. Another category of spectrometers uses the Earth’s magnetic field, which is simple and economical but limited in use. These devices are called Earth-Field Nuclear Magnetic Resonance (EFNMR) devices. This device is ideal for educational purposes, especially for engineers and those who study nuclear magnetic resonance, such as chemistry or other experimental sciences. Students can observe their internal workings and conduct experiments that complement their education without worrying about damaging equipment. This article provides a detailed explanation of the design and construction of electrical technology devices for the excitation of atomic spin resonance using Earth’s magnetic fields. It covers all necessary stages, from research to analysis, including simulation, assembly, construction of each component, and the development of comprehensive software for spectrometer control.

Spain’s National Integrated Energy and Climate Plan (PNIEC) addresses the policies and measures needed to contribute to the European target of a 23% reduction in greenhouse gas emissions by 2030 compared to 1990 levels. To this end, the decarbonization of the transport sector is very important in order to increase electric mobility. Electric mobility depends on the conditions of the electrical infrastructure. This research focuses on the electrical distribution network in terms of its current capacity for recharging electric vehicles, which are estimated to account for 20.7% of vehicles, which is about 4 million vehicles. This, therefore, illustrates the need to legislate to improve the electrical infrastructure for recharging electric vehicles, with the aim of deploying electric vehicles on a larger scale and, ultimately, allowing society to benefit from the advantages of this technology.

A new methodology for visualizing power quality (PQ) events in three-phase circuits is presented. It employs an Euclidean vector space to represent 4D information embedded in a 3D point-cloud-like curve in time domain. We exploit the recently developed concept of Cyclic Histograms in single-phase systems by extending and modifying it to multi-phase power systems. Triplets of voltages (line-to-line or line-to-neutral) are used as coordinates of points that are assigned to specific regions in space (voxels). Over time, a counter for each voxel is incremented whenever the discrete trajectory transits the voxel. A color is then assigned to every voxel depending on the final count. The results showed that the color and shape of the spatial trajectories provide information regarding harmonic distortion, voltage unbalance, and transient phenomena. This method can also be applied to current waveforms. Some examples are provided using real-world waveforms to highlight the benefits of the proposed work.