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Topic Review
Occurrence of Bearing Currents in Electric Machines
In electrical machines, there are numerous negative phenomena of a destructive nature. The constructors of electrical machines try to limit these phenomena and/or minimize their negative effects. One such phenomenon in electrical machines is the occurrence of bearing voltages and currents. Despite their simple structure, the bearings are susceptible to damage to the raceway surface and rolling elements. Even small traces and imperfections of these surfaces may cause a serious failure resulting in the bearing being excluded from further operation.
  • 599
  • 11 Jul 2022
Topic Review
Bioretention Systems Optimization and Design Characterization Model
Urban stormwater has become a persistent concern on a global scale due to its adverse environmental implications. It is the prime vector of aquatic contaminants worldwide that causes pollutants when water bodies drain. Bioretention systems are increasingly used to alleviate setbacks associated with stormwater run-off in urban locales. It has played a substantial role in the implementation of low impact development (LID), a concept that addresses urban stormwater problems caused by land changes and development. The use of LID technologies is an innovative approach.
  • 597
  • 30 Jun 2022
Topic Review
Overview of the Development of ZnO-Based Varistors
Voltage surge protection devices (SPDs) or surge arresters rely on metal oxide varistors (MOVs) to safeguard electrical equipment in consumer electronics and industrial electric power systems against the destructive temporary overvoltages (TOVs) resulting from transient switching surges or lightning strikes. The primary function of voltage-sensitive MOVs in SPDs is to prevent the damage caused by high-energy transients by clamping or eliminating them when a surge occurs. These MOVs are mounted in parallel with the components that they are designed to protect.
  • 593
  • 29 May 2023
Topic Review
Pedestrian Identification and Classification in Autonomous Vehicles
Pedestrian detection is at the core of autonomous road vehicle navigation systems as they allow a vehicle to understand where potential hazards lie in the surrounding area and enable it to act in such a way that avoids traffic-accidents, which may result in individuals being harmed. This paper demonstrates that the use of image augmentation on training data can yield varying results. 
  • 591
  • 10 Jan 2022
Topic Review
The Discovery of Infrared Radiation
This entry is mainly about the story of infrared radiation
  • 588
  • 02 Dec 2021
Topic Review
Distribution Network Planning with DPG and ESS
Distributed Power Generation and Energy Storage Systems (DPG-ESSs) are crucial to securing a local energy source. Both entities could enhance the operation of Smart Grids (SGs) by reducing Power Loss (PL), maintaining the voltage profile, and increasing Renewable Energy (RE) as a clean alternative to fossil fuel. However, determining the optimum size and location of different methodologies of DPG-ESS in the SG is essential to obtaining the most benefits and avoiding any negative impacts such as Quality of Power (QoP) and voltage fluctuation issues.
  • 588
  • 11 May 2023
Topic Review
Community Connected Microgrids
Renewable energy systems in the form of community microgrids, and grid-connected solar PV-storage are considered primary solutions for powering residential developments. The primary objectives for commissioning such systems include significant electricity cost reductions and carbon emissions abatement. Despite the proliferation of renewables, the uptake of solar and battery storage systems in communities and multi-residential buildings are less researched in the literature, and many uncertainties remain in terms of providing an optimal solution.
  • 586
  • 16 Jul 2021
Topic Review
Lead–Acid Battery Faults
Lead–acid battery technology has been effectively fulfilling a variety of energy needs, ranging from classic car industry requirements to current plug-in hybrid electric vehicle requirements through any stationary system. Depending on the operating conditions, the battery can be affected in many ways. The same deterioration mechanisms affect all types of lead–acid batteries but to varying degrees. Two electrodes with the aqueous H2SO4 electrolyte (sulfuric acid) and the terminals are the main components of a lead–acid battery. A grid and the active material—PbO2 as the positive active material and Pb as the negative active material—make up the electrodes.
  • 583
  • 05 Mar 2024
Topic Review
Power System Balancing
The use of wind power has grown strongly in recent years and is expected to continue to increase in the coming decades. Solar power is also expected to increase significantly. In a power system, a continuous balance is maintained between total production and demand. This balancing is currently mainly managed with conventional power plants, but with larger amounts of wind and solar power, other sources will also be needed. Interesting possibilities include continuous control of wind and solar power, battery storage, electric vehicles, hydrogen production, and other demand resources with flexibility potential.
  • 581
  • 04 Sep 2023
Topic Review
Ionic Liquid Electrolytes
For decades, improvements in electrolytes and electrodes have driven the development of electrochemical energy storage devices. Generally, electrodes and electrolytes should not be developed separately due to the importance of the interaction at their interface. The energy storage ability and safety of energy storage devices are in fact determined by the arrangement of ions and electrons between the electrode and the electrolyte.
  • 579
  • 03 Aug 2021
Topic Review
Batteries for Internet of Things Applications
There has been significant progress in IoT solutions for a variety of fields. The real-time functionality and remote deployment of IoT solutions are two crucial aspects that are necessary for their successful implementation. To achieve this, external batteries play a major role. While lithium–ion batteries are often the go-to choice for IoT devices, it is essential to recognise that different IoT applications have unique needs. Therefore, it is important to conduct a thorough examination of existing battery solutions and their suitability for various IoT applications. 
  • 577
  • 29 Dec 2023
Topic Review
Metamaterial-Based Absorptive Structures
Metamaterials are artificially-engineered synthetic materials having periodic arrangements of sub-wavelength metallic/dielectric structures or resonators. Metamaterials have demanded a lot of recognition, due to their exotic and unique attributes such as negative-refraction, microwave cloaking, absorption of the inverse Doppler effect, etc. After the investigation of the first ‘perfect meta-absorber’ proposed in 2008, metamaterial absorbers (MMAs) have drawn significant interest from the microwave and optics community. These MMAs have multifarious features compared with the conventional Salisbury absorbers, such as a low-profile and light weight. Moreover, they are thinner, more compact, and more efficient than conventional absorbers. They have many applications for wireless communication and other optical systems, including MIMO antenna isolation, EM interference reduction, stealth technology, and solar photovoltaics.
  • 576
  • 16 Nov 2022
Topic Review
Streaming Electrification of Different Insulating Fluids
The comparison of different techniques used to assess the charging tendency of fluids is discussed depending on the flow type (planar or centrifugal), volume of oil, and interface material. The charge separation between the insulating fluid and metallic/pressboard interfaces is explained in terms of the electrical double layer formation involving a fixed layer and diffuse layer. Based on the experimental results, the streaming electrification is observed to be a function of various factors such as speed, temperature, electric field, and surface roughness. Depending on the molecular structure of insulating liquids that come into contact with solid insulation at the interface, the streaming current can increase; hence, a suitable additive (benzotriazole, fullerene, Irgamet 39) is selected based on the type of fluid and charge polarity. The degradation of the insulating liquid upon ageing, which increases the streaming current and reclamation of such aged fluids using adsorbents (Fuller’s earth, activated carbon, bentonite, and alumina), is a possible method to suppress the static current through improving its dielectric properties. The nanofluids show a higher streaming current compared to base fluid with no change observed even after the reclamation process. 
  • 575
  • 14 Dec 2022
Topic Review
Combined Heat and Power-Based Microgrids
The microgrid has emerged to reduce centralized generation problems and make structural changes to power systems. Parallel operation of distributed generation (DG) units, combined heat and power (CHP) units, and energy storage in the microgrids reduces environmental pollution, operation costs, and increases the reliability of energy systems. 
  • 571
  • 05 Jul 2021
Topic Review
Virtual Lab
VirtLAB is a Low-Cost Platform for Electronics Lab Experiments. The recent SARS-CoV2 pandemic has put a great challenge on university courses. Electronics teaching requires real laboratory experiences for students, which cannot be realized if access to physical infrastructures is prohibited. A possible solution would be to distribute to students, at home, electronics equipment suitable for laboratory experiments, but no reasonable product is currently available off-the-shelf.
  • 571
  • 22 Jul 2022
Topic Review
Nationale Plattform Elektromobilität
The German National Platform for Electric Mobility ("Nationale Plattform Elektromobilität") is an advisory council of the German Federal Government for electric vehicle introduction. It consists of the top representatives of industry (10 Members), politics (6), science (3), associations (3) and unions (1). It was officially established on 3 May 2010 during a meeting with German chancellor Angela Merkel. Its task is to push on the National Development Plan for Electric Mobility ("Nationaler Entwicklungsplan Elektromobilität"). The goal for 2020 of the NPE is to develop Germany to the leading supplier and lead market for electric mobility and to gain an employment effect of 30,000 additional jobs.
  • 569
  • 26 Oct 2022
Topic Review
Detection of Phase/Switch Open-Circuit Faults in Multiphase Drives
Phase open-circuit (OC) failures in multiphase electric ac drives involve OCs in stator phases or in converter-machine connections, and switch/diode OCs are frequently dealt with similarly or identically. Thanks to the phase redundancy of multiphase drives (with more than three phases), their operation can be satisfactorily continued under a certain number of OCs.  Phase/switch OC faults can be regarded as one of the most usual electrical failures in ac drives, and for this reason a significant number of works are focused on the diagnosis of this undesired incident. The detection of OC faults and the identification of the affected phases have typically been mandatory tasks in order to ensure a proper postfault reconfiguration. 
  • 567
  • 01 Apr 2022
Topic Review
Power Grid Infrastructural Resilience against Extreme Events
Extreme weather events are one of the main causes of large-scale power outages in distribution systems. The changing climate has led to an increase in the frequency and severity of these events, which, if not mitigated, are expected to lead to more instances of widespread outages and the severe societal and economic damages that ensue. Protecting the power grid against such events, which are high impact yet low frequency, requires a paradigm shift in grid design practices.
  • 566
  • 19 Jan 2023
Topic Review
Decoupling Recurrent Neural Networks in Training and Testing
Recurrent neural networks (RNN) have been shown to outperform other architectures when processing temporally correlated data, such as from wireless communication signals. However, traditional usage assumes a fixed observation interval during both training and testing despite the sample-by-sample processing capabilities of RNNs. Rather than assuming that the testing and observation intervals are equivalent, the observation intervals can be “decoupled" or set independently. This opens the door for processing variable sequence lengths in inference  by defining a decision criteria. "Decoupling" can potentially reduce training times and will allow for trained networks to be adapted to different applications without retraining -- including applications in which the sequence length of the signal of interest may be unknown. 
  • 564
  • 22 Jul 2022
Topic Review
Flexible Planar Monopole Antenna
Flexible antennas consist of a dielectric material (which works as the substrate) and a conductive material (which can be used as a radiating element and/or ground plane).
  • 563
  • 08 Sep 2021
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