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Topic Review
Insulation System and Aging Phenomenon
The insulating system of the windings of electrical machines is multi-layer and consists of coil and main (slot) insulation. The thickness of the insulation is selected with a margin so that its durability to breakdown is greater than the existing voltage. 
  • 2.4K
  • 23 Nov 2022
Topic Review
Thin-Film Solar Cells
Due to the surge in silicon demand for solar modules, thin-film photovoltaic (PV) modules have a potential to penetrate the market in significant numbers. As an alternate candidate, thin film technologies in PVs have the ability to achieve better performance. The competing thin-film PV technologies have the flexibility to adapt to any sort of curvature compared to rigid solar cells (SCs). Due to the peculiar characteristics of newer solar materials, stability issues, reflection losses, advancements in electrode materials and dopant materials with a photoactive layer are current challenges driving the industrial-academic voyage of development of solar materials for the betterment of Photo-conversion Efficiency (PCE). Based on the photoactive materials used over time, SC evolution was broadly classified into first, second and third generation SCs.  
  • 2.4K
  • 25 Nov 2022
Topic Review
Smart Electro-Clothing Systems
This entry presents an overview of the smart electro-clothing systems (SeCSs) targeted at health monitoring, sports benefits, fitness tracking, and social activities. Technical features of the available SeCSs, covering both textile and electronic components, are thoroughly discussed and their applications in the industry and research purposes are highlighted. In addition, it also presents the developments in the associated areas of wearable sensor systems and textile-based dry sensors. As became evident during the literature research, such a review on SeCSs covering all relevant issues has not been presented before. This entry will be particularly helpful for new generation researchers who are and will be investigating the design, development, function, and comforts of the sensor integrated clothing materials.
  • 2.4K
  • 01 Nov 2020
Topic Review
Regenerative Brake
Regenerative braking is an energy recovery mechanism that slows down a moving vehicle or object by converting its kinetic energy into a form that can be either used immediately or stored until needed. In this mechanism, the electric traction motor uses the vehicle's momentum to recover energy that would otherwise be lost to the brake discs as heat. This contrasts with conventional braking systems, where the excess kinetic energy is converted to unwanted and wasted heat due to friction in the brakes, or with rheostatic brakes, where the energy is recovered by using electric motors as generators but is immediately dissipated as heat in resistors. In addition to improving the overall efficiency of the vehicle, regeneration can significantly extend the life of the braking system as the mechanical parts will not wear out very quickly.
  • 2.4K
  • 17 Nov 2022
Topic Review
CMOS Amplifiers
CMOS amplifiers are ubiquitous analog circuits which are used in computers, audio systems, smart phones, cameras, telecommunication systems, biomedical circuits and many other systems, and their performance has great impact on the overall specifications of the systems. They take their name from the use of MOSFET (Metal Oxide Semiconductor Field Effect Transistor) as opposite to Bipolar Junction Transistors (BJT). MOSFETS are simpler to fabricate and therefore less expensive than BJT amplifiers, still providing a sufficiently high transconductance to allow the design of very high performance circuits. In high performance CMOS amplifier circuits, transistors are not only used to amplify the signal but are also used as active loads to achieve higher gain and output swing in comparison with resistive loads. CMOS technology had been primarily introduced to design digital circuits. In the last decades, in order to improve speed, power consumption, required area and other aspects of digital integrated circuits (ICs), the feature size of MOSFET transistors has shrunk (minimum channel length of transistors reduces in newer CMOS technologies). This phenomenon predicted by Gordon Moore in 1975, which is called Moore’s law, and states that in about each 2 years, the number of transistors doubles for the same silicon area of ICs. Progress in memory circuits design is an interesting example to see how process advancement have affected the required size and their performance in the last decades. In 1956, a 5MB Hard Disk Drive (HDD) weighted over a tone, while these days having 50000 times more capacity with a weight of several tens of grams is very common. While digital ICs have enormously benefited from the feature size shrinking, analog CMOS amplifiers have not gained corresponding advantages due to the intrinsic limitations imposed by an analog design, like the intrinsic gain reduction of short channel transistors which affects the overall gain of amplifier. Novel techniques to achieve higher gain also create new problems, like stability of amplifier for closed-loop applications. In the following, we will address both aspects and summarize few different methods to overcome these problems.
  • 2.4K
  • 07 Nov 2022
Topic Review
Digital Technologies in the Water System
Urban water supply systems are complex and dynamic in nature, and as a result, can be considered complex to manage owing to enhanced urbanization levels, climate change, growing and varying consumer demands, and limited water resources. The operation of such a system must be managed effectively for sustainable water supply to satisfy the growing consumer demand. With the increasing growth in technology, the water sector is moving to the full phase of digitalization to enhance the sustainability of systems.
  • 2.4K
  • 22 Sep 2022
Topic Review
Flexible AC Transmission Systems Technologies
The advancements in power electronics have shown considerable improvement in satisfying the need for voltage stability and power quality improvement by introducing Flexible AC Transmission Systems (FACTS) technology. The main functions of these devices are reactive power compensation, voltage control, and power flow control to enhance better power quality in modern power systems.
  • 2.4K
  • 05 Jul 2022
Topic Review
Non-Intrusive Load Monitoring and Network
Non-intrusive load monitoring (NILM), also known as energy disaggregation, tries to decompose aggregated energy consumption data and estimate each appliance’s contribution. 
  • 2.4K
  • 05 Aug 2022
Topic Review
Ultrasonic and UWB Technology for Indoor Localization
Evaluations of different technologies and solutions for indoor localization exist but only a few are aimed at the industrial context. It's showed that an acceptable accuracy required for tracking people or objects and could serve as a guideline for the least achievable accuracy when applied for mobile robotics in conjunction with other elements of a robotic navigation stack. 
  • 2.4K
  • 12 Jun 2022
Topic Review
Application of Two-Dimensional Materials towards CMOS-Integrated Gas Sensors
The semiconductor metal oxide (SMO)-based gas sensor, considered the current workhorse of semiconductor-based chemiresistive gas sensor technologies, requires high temperatures to initiate the surface reactions which result in the sensing response, making it difficult to fabricate and prone to high mechanical instability. Therefore, alternatives at lower temperatures are desired, where 2D materials seem to hold the most promise. Even at ambient temperature, their sensitivity is extraordinarily large due to their extremely high surface-to-volume ratio. However, some ongoing issues still need to be resolved before gas sensors based on 2D materials can be widely used and commercialized. The alternative room temperature solutions involve optical signals, either by designing an nondispersive infrared (NDIR) sensor based on the Beer-Lambert law or by introducing an additional UV illumination to SMO sensors. In both cases, complementary metal oxide semiconductor (CMOS) integration is not feasible, which is why continued interest in 2D-material-based gas sensors persists.
  • 2.4K
  • 02 Dec 2022
Topic Review
InP based HEMTs
High Electron Mobility Transistors (HEMT), also known as HFETs or modulation doped Field Effect Transistors (MODFETs), is a form of field effect transistor, which is capable of providing high levels of performances at microwave frequencies.
  • 2.4K
  • 26 May 2021
Topic Review
Power Electronics Converters for Electric Vehicle Auxiliaries
Electric vehicles (EVs) are expected to take over the transportation and mobility market over traditional internal combustion engine (ICE) vehicles soon. The internal power demands of EVs are expected to increase. The reason for this is to achieve a longer driving range for the EV and to provide the required power for the low-voltage (LV) network auxiliary loads. To illustrate, there are extra added sensors, cameras, and small actuating motors, especially for future autonomous vehicles. Therefore, a new electrical/electronic (E/E) architecture is required to convert the high-voltage (HV) traction battery voltage (e.g., 320–800 V DC) to the standard LV levels with high current ratings of 5 kW and more. This HV-LV DC-DC converter is known in the literature as an auxiliary power module (APM). 
  • 2.4K
  • 13 Mar 2023
Topic Review
Multi-Level Inverter
Multilevel inverter had been paid a lot of attention from the academia and research community in recent times due to its role in high and medium power applications. 
  • 2.4K
  • 03 Mar 2021
Topic Review
Resistive Random-Access Memory
Resistive random access memory (RRAM), also often referred to as a memristor, is a non-volatile memory made from the simple structure of a metal–insulator–metal (MIM) sandwich, which is generally integrated into an elementary crossbar circuit. Resistive random access memory stands out among memory technologies due to its scalability, high-speed operation, and low power consumption. 
  • 2.4K
  • 14 Mar 2023
Topic Review
Rotor Dynamic Scattering
Rotor dynamic scattering refers to the phenomenon that a rotating rotor-like component continuously deflects incident radar waves in the observation field to generate dynamic echoes. This scattering feature has obvious dynamic characteristics and periodic characteristics. Factors such as observation angle, radar wave frequency, polarization mode, rotor disc angle and rotor carrier attitude angle are closely related. The emergence of dynamic scattering has transformed the rotor radar cross-section (RCS) problem from static solution to dynamic analysis. Studying rotor dynamic scattering has great engineering value for designing stealth rotors from the dynamic RCS level.
  • 2.4K
  • 30 Oct 2020
Topic Review
Intelligent Buildings in Smart Grids
During the last decade, the smart grid (SG) concept has started to become a reality, mainly thanks to the technical progress achieved in telecommunications, informatics and power electronics, among other domains, leading to an evolution of the traditional electrical grid into an intelligent one. Nowadays, the SG can be seen as a system of smart systems that include cyber and physical parts from different technologies that interact with each other. In this context, intelligent buildings (IBs) constitute a paradigm in which such smart systems are able to guarantee the comfort of residents while ensuring an appropriate tradeoff of energy production and consumption by means of an energy management system (EMS).
  • 2.4K
  • 08 Jun 2021
Topic Review
Wind Energy Conversion Systems Based on Synchronous Generator
Since 20th century, electricity has been widely available, and a large portion of it is produced using coal and gas. Because of its adaptability and simplicity of delivery, electricity is a premium kind of energy. Global demand is rising because of rising consumer electronics, associated industrial activities, and greater consumer access in emerging nations. The most reliable and progressive renewable energy source is wind power. Utilizing the highest amount of wind power available and operating the wind turbine (WT) at its maximum energy conversion output is essential for the rapid adoption of wind generators in electrical grids. To complete this, a wind energy conversion system (WECS) must track or run at the maximum power point.
  • 2.4K
  • 23 Mar 2023
Topic Review
WirelessHART
The industrialization has led to a huge demand for a network control system to monitor and control multi-loop processes with high effectiveness. WirelessHART is a wireless sensor networking technology based on the existing conventional wired Highway Addressable Remote Transducer (HART) protocol. The protocol utilizes a time-synchronized, self-organizing, and self-healing mesh architecture. This is the first wireless communication protocol that adopts over 2.4 GHz radio-frequency channel in the IEEE 802.15.4 for industrial process control applications.
  • 2.4K
  • 26 Jul 2021
Topic Review
GaN-Based LEDs: Modeling and Simulation
Light-emitting diodes (LEDs) based on Gallium Nitride (GaN) have been revolutionizing various applications in lighting, displays, biotechnology, and other fields. Many theoretical models have been developed for GaN-LED simulation, analysis, and design optimization, including carrier transport models, quantum well recombination models, and light extraction models. The overview below is a strongly abbreviated version of Ref. [1].
  • 2.3K
  • 17 Dec 2020
Topic Review
Touch Sensors for Flexible Wearable Devices
The traditional touch sensors are bulky, complicated, inflexible, and difficult-to-wear devices made of stiff materials. The touch screen is gaining further importance with the trend of current IoT technology flexibly and comfortably used on the skin or clothing to affect different aspects of human life. Flexible sensors have advantages over conventional rigid devices. These sensors are nontoxic and lightweight and can be worn comfortably on the body.
  • 2.3K
  • 21 Jul 2022
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