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Topic Review
5G Wearable Devices
One potential way of enhancing capacity and data rates in the current and future mobile and wireless generations is the bandwidth. The data rates are directly proportional to the bandwidth. The higher bandwidth provides higher data rates. However, current frequency bands, i.e., 1.7 GHz GSM band, 1.8 GHz 4G/LTE band, 2.0 GHz 4G/LTE band, 2.1 LTE band, and 2.6 GHz band, provide limited bandwidth. Recently, high-frequency bands including 24 GHz (n258), 28 GHz (n257 and n261), 37 GHz (n260), and 39 GHz (n260) in addition to some future recommended bands, i.e., 47 and 60 GHz, have been considered for 5G applications.
  • 1.6K
  • 11 Jan 2022
Topic Review
Theoretical Framework of Thermoelectric Generation
The world’s growing energy demand poses several concerns regarding the rational and efficient use of energy resources. This is also the case for many industrial processes, where energy losses and particularly thermal losses are common. Thermoelectric generators offer an alternative to address some of these challenges by recovering wasted heat and thereby increasing the overall efficiency of these processes. The successful operation of the thermoelectrical modules meant to carry this process is only possible when pairing these to an external control system; such a system plays an important role in predicting and operating such modules at its maximum power point.
  • 1.6K
  • 20 Jan 2023
Topic Review
Interfaces in State-of-the-Art Cable Connectors
One of the most important causes of insulation system failure is the breakdown of the interface between two solid dielectrics; understanding the mechanisms governing this breakdown phenomenon is therefore critical. Solid–solid interfaces in accessories have non-uniform distributions of electrical fields within them in comparison to cables, where the distribution is mostly radial and symmetrical.
  • 1.6K
  • 07 Dec 2021
Topic Review
Free-Carrier-Depletion-Based Phase Shifter
Free-carrier-dispersion-based phase shifters are favored in the field of telecommunications and data centers due to their high modulation speed and low power consumption. Based on the working mechanism, free-carrier-dispersion-based phase shifters fall into three categories: carrier injection, carrier depletion, and carrier accumulation.
  • 1.6K
  • 28 Sep 2022
Topic Review
Energy Management and Control Techniques for Electric Vehicle
Electric vehicles (EVs) are universally recognized as an incredibly effective method of lowering gas emissions and dependence on oil for transportation. Electricity, rather than more traditional fuels like gasoline or diesel, is used as the main source of energy to recharge the batteries in EVs. Future oil demand should decline as a result of the predicted rise in the number of EVs on the road. The charging infrastructure is considered as a key element of EV technology where the recent research is mostly focused. A strong charging infrastructure that serves both urban and rural areas, especially those with an unstable or nonexistent electrical supply, is essential in promoting the global adoption of EVs.
  • 1.6K
  • 10 Aug 2023
Topic Review
Piezoelectric Rotary Harvesters
Technologies of energy harvesting have been developed intensively since the beginning of the twenty-first century, presenting themselves as alternatives to traditional energy sources (for instance, batteries) for small-dimensional and low-power electronics. Batteries have numerous shortcomings connected, for example, with restricted service life and the necessity of periodic recharging/replacement that create significant problems for portative and remote devices and for power equipment. Environmental energy covers solar, thermal, and oscillation energy. By this, the vibration energy exists continuously around us due to the operation of numerous artificial structures and mechanisms. Different materials (including piezoelectrics) and conversion mechanisms can transform oscillation energy into electrical energy for use in many devices of energy harvesting. Piezoelectric transducers possessing electric mechanical coupling and demonstrating a high density of power in comparison with electromagnetic and electrostatic sensors are broadly applied for the generation of energy from different oscillation energy sources.
  • 1.6K
  • 14 Apr 2022
Topic Review
Viewing Angle Switchable Liquid Crystal Devices
For pure liquid crystals (LCs) system, methods for switchable viewing angle devices are divided into hybrid aligned nematic (HAN) LC cells, double cells, pixel division and three-electrode structure. Utilizing 3M light-control film and PDLC film together to create switchable anti-peeping film, PDLC is a voltage-controlled LC film that can switch between transparent and scattering, light scattering intensity of PDLC film is dependent on electric field, switchable voltage between light scattering (share mode) and transparent state (privacy mode) is approximately 5.0 V.
  • 1.6K
  • 10 Oct 2022
Topic Review
Power Grid Infrastructures
This content presents a comprehensive review of protection systems with the penetration of microgrids in the distribution network. The expansion of a microgrid affects the coordination and protection by a change in the current direction in the distribution network. 
  • 1.6K
  • 01 Dec 2020
Topic Review
Non-Resonant Single-Wire Power Transmission Systems
A single-wire power transmission is an option for reducing the capital cost of power line construction by utilizing fewer conductors and fittings and lighter power transmission towers while lowering operational expenses.
  • 1.6K
  • 31 Jul 2023
Topic Review
Repulsion Motor
A repulsion motor is a type of electric motor for using on alternating current (AC). It was formerly used as a traction motor for electric trains (e.g. SR Class CP and SR Class SL electric multiple units) but has been superseded by other types of motors. Repulsion motors are classified under single phase motors. In repulsion motors the stator windings are connected directly to the AC power supply and the rotor is connected to a commutator and brush assembly, similar to that of a direct current (DC) motor.
  • 1.6K
  • 08 Nov 2022
Topic Review
Swarm Robotics
Swarm robotics is a dynamic research field that integrates two important concepts: Swarm Intelligence (SI) and Multi-Robotics System (MRS).
  • 1.6K
  • 02 Jun 2022
Topic Review
Major High-Voltage Insulator Contamination Level Classification Techniques
Insulators are considered one of the most significant parts of power systems which can affect the overall performance of high-voltage (HV) transmission lines and substations. High-voltage insulators are critical for the successful operation of HV overhead transmission lines, and a failure in any insulator due to contamination can lead to flashover voltage, which will cause a power outage. The electrical performance of HV insulators is highly environment sensitive. The main cause of these flashovers in the industrial, agricultural, desert, and coastal areas, is the insulator contamination caused by unfavorable climatic conditions such as dew, fog, or rain. The different methods adopted to identify the contamination level on high-voltage insulators are discussed.
  • 1.6K
  • 15 Nov 2022
Topic Review
Apple Cinema Display
The Apple Cinema Display is a line of flat-panel computer monitors developed and sold by Apple Inc. between 1999 and 2011. It was initially sold alongside the older line of Studio Displays, but eventually replaced them. Apple offered 20-, 22-, 23-, 24-, 27- and 30-inch sizes, with the last model being a 27-inch size with LED backlighting. There have been three designs for the Cinema Display, one featuring polycarbonate plastic and two featuring anodized aluminum. The first displays were designed to match the colorful plastic of the Power Mac G3 and later the Power Mac G4, while the second revisions were designed to match the aluminum aesthetics of the Power Mac G5 and PowerBook G4. The last available design matched the unibody laptops released in October 2008. The Apple Cinema Display name was retired in July 2011 with the introduction of the Apple Thunderbolt Display, and the Cinema Display models were no longer offered on the Apple Store website as of August 2014.
  • 1.6K
  • 05 Dec 2022
Topic Review
PV based EV Charging Modelling
Electric vehicles (EVs) are one of a prominent solution for the sustainability issues needing dire attention like global warming, depleting fossil fuel reserves, and greenhouse gas (GHG) emissions. Conversely, EVs are shown to emit higher emissions (measured from source to tailpipe) for the fossil fuel-based countries, which necessitates renewable energy sources (RES) for maximizing EV benefits. EVs can also act as a storage system, to mitigate the challenges associated with RES and to provide the grid with ancillary services, such as voltage regulation, frequency regulation, spinning reserve, etc. For extracting maximum benefits from EVs and minimizing the associated impact on the distribution network, modelling optimal integration of EVs in the network is required.
  • 1.6K
  • 02 Nov 2023
Topic Review
Overview of Distributed Generation Sources in Microgrids
In response to increasing environmental concerns, advances in renewable energy technology and reduced costs have caused a significant increase in the penetration of distributed generation resources in distribution networks. Nonetheless, the connection of distributed generation resources to distribution networks has created new challenges in the control, operation, and management of network reliability. From the Electric Power Research Institute (EPRI) point of view, the term distributed generation can be used to refer to “small-scale energy production to meet local needs that has a production capacity in the range of 100 kW to 10 MW”.
  • 1.6K
  • 13 Sep 2022
Topic Review
Electrically Excited Doubly Salient Variable Reluctance Machine
The Electrically Excited Doubly Salient Variable Reluctance Machine (EEDSVRM) is a new type of brushless machine designed according to the principle of air gap reluctance change.
  • 1.6K
  • 14 Jan 2022
Topic Review
Electrical Contacts
An electrical contact is an electrical circuit component found in electrical switches, relays, connectors and circuit breakers. Each contact is a piece of electrically conductive material, typically metal. When a pair of contacts touch, they can pass an electrical current with a certain contact resistance, dependent on surface structure, surface chemistry and contact time; when the pair is separated by an insulating gap, then the pair does not pass a current. When the contacts touch, the switch is closed; when the contacts are separated, the switch is open. The gap must be an insulating medium, such as air, vacuum, oil, SF6. Contacts may be operated by humans in push-buttons and switches, by mechanical pressure in sensors or machine cams, and electromechanically in relays. The surfaces where contacts touch are usually composed of metals such as silver or gold alloys that have high electrical conductivity, wear resistance, oxidation resistance and other properties.
  • 1.6K
  • 04 Nov 2022
Topic Review
Field Measurement Studies on Indoor Air Quality
The Indoor Air Quality (IAQ) is one of the key factors that influence the quality of the indoor environment, as well as the human health.
  • 1.6K
  • 16 Feb 2022
Topic Review
Color Coding Technology for Visualization
Color coding technology for data visualization Data visualization achieves its significance today due to information technology: big data processed in computers with capable visualization software, combined with statistical techniques and color coding on electronic displays. This article is about color coding technology for data visualization. Origins of color coding include rubrics, the Four Color Theorem of cartography and Jacques Bertin's 1967 book, The Semiology of Graphics. Contemporary color coding for data visualization is enabled by four technologies: statistics, color technology, displays and computing. Visualization of data was proceduralized by statisticians John Tukey and Edward Tufte in their respective landmark books Exploratory Data Analysis in 1977 and Visual Display of Quantitative Information in 1982. They did not emphasize the use of color. Others demonstrated the superiority of color coding to speed visual search of displayed information, and to locate and organize information of interest. A third prerequisite for color-coded data visualization is high-resolution, high-contrast, high-luminance color electronic displays. Honeywell Corporation and Boeing Corporation assembled technical data that are still germane to use of color displays. More recently, the US Federal Aviation Administration has published technical guidance for visualization of dynamic (air traffic) data on self-luminous color displays. Humans have an innate ability to perform color-coded visual search. Without training or practice, the search time with color coding can be reduced by a factor of ten or more, compared to a search of the same information display without color coding. 
  • 1.6K
  • 12 Oct 2022
Topic Review
Electric Vehicle Batteries
In electric and hybrid vehicles Life Cycle Assessments (LCAs), batteries play a central role and are in the spotlight of scientific community and public opinion. Automotive batteries constitute, together with the powertrain, the main differences between electric vehicles and internal combustion engine vehicles. For this reason, many decision makers and researchers wondered whether energy and environmental impacts from batteries production, can exceed the benefits generated during the vehicle’s use phase. In this framework, the purpose of the present literature review is to understand how large and variable the main impacts are due to automotive batteries’ life cycle, with particular attention to climate change impacts, and to support researchers with some methodological suggestions in the field of automotive batteries’ LCA. The results show that there is high variability in environmental impact assessment; CO2eq emissions per kWh of battery capacity range from 50 to 313 g CO2eq/kWh. Nevertheless, either using the lower or upper bounds of this range, electric vehicles result less carbon-intensive in their life cycle than corresponding diesel or petrol vehicles.
  • 1.6K
  • 27 Oct 2020
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