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Topic Review
Torsion-Resistant Nature-Inspired Structures
The complexity of torsional load, its three-dimensional nature, its combination with other stresses, and its disruptive impact make torsional failure prevention an ambitious goal. However, even if the problem has been addressed for decades, a deep and organized treatment is still lacking in the actual research landscape. For this reason, this review aims at presenting a methodical approach to address torsional issues starting from a punctual problem definition. Accidents and breaks due to torsion, which often occur in different engineering fields such as mechanical, biomedical, and civil industry are considered and critically compared. More in depth, the limitations of common-designed torsion-resistant structures (i.e., high complexity and increased weight) are highlighted, and emerge as a crucial point for a deeper nature-driven analysis of novel solutions. In this context, an accurate screening of torsion-resistant bio-inspired unit cells is presented, taking inspiration specifically from plants, that are often subjected to the torsional effect of winds. As future insights, the actual state of technology suggests an innovative transposition to the industry: these unit cells could be prominently implied to develop novel metamaterials that could be able to address the torsional issue with a multi-scale and tailored arrangement.
  • 1.2K
  • 09 Oct 2021
Topic Review
Torque Ripple Reduction Design Methods
There are some phenomena that affect electric vehicle performance. One of those phenomena is the torque ripple of electric motors, which interferes with traction and the suspension system (causing vibration that stresses this system), and it can also introduce electric current harmonics into the battery, reducing its life, since torque ripple is partly a consequence of non-sinusoidal back EMF. For those reasons this is a topic worth investigating. The torque ripple of permanent magnets (PM) motors can be reduced in design or through control.
  • 1.0K
  • 15 Dec 2022
Biography
Torkel Korling
Torkel Korling (April 24, 1903 – October 22, 1998) was a Swedish-born American -, commercial, portrait and botanical photographer. Torkel Korling was born into a 400-year line of Lutheran Church choir directors and organists in Kristdala, Sweden. His father, Felix Körling, was first to find success beyond the church as a composer and conductor in Sweden. Korling set out to be a botanist. T
  • 389
  • 13 Dec 2022
Topic Review
Torino Scale
The Torino scale is a method for categorizing the impact hazard associated with near-Earth objects (NEOs) such as asteroids and comets. It is intended as a communication tool for astronomers and the public to assess the seriousness of collision predictions, by combining probability statistics and known kinetic damage potentials into a single threat value. The Palermo Technical Impact Hazard Scale is a similar, but more complex scale. Near-Earth objects with a Torino scale of 1 pop up every couple of months or so and may last a few weeks until they have a longer observation arc.
  • 662
  • 21 Nov 2022
Topic Review
Topology Optimisation Methods for Satellite Structures
Launching satellites into the Earth’s orbit is a critical area of research, and very demanding satellite services increase exponentially as modern society takes shape. At the same time, the costs of developing and launching satellite missions with shorter development times increase the requirements of novel approaches in the several engineering areas required to build, test, launch, and operate satellites in the Earth’s orbit, as well as in orbits around other celestial bodies. One area with the potential to save launching costs is that of the structural integrity of satellites, particularly in the launching phase where the largest vibrations due to the rocket motion and subsequent stresses could impact the survival ability of the satellite. To address this problem, two important areas of engineering join together to provide novel, complete, and competitive solutions: topology optimisation methods and additive manufacturing. Topology optimisation methods are mathematical methods that allow iteratively optimising structures (usually by decreasing mass) while improving some structural properties depending on the application (load capacity, for instance), through the maximisation or minimisation of a uni- or multi-objective function and multiple types of algorithms. This area has been widely active in general and has two main core types of algorithms: continuum methods that modify continuous parameters such as density, and discrete methods that work by adding and deleting material elements in a meshing context. 
  • 204
  • 15 Jan 2024
Topic Review
Topology and Symmetry Analysis of Power Converters
Power converters can convert the electrical energy output by power source into specific forms required by target device. They are widely used in various fields such as electrification, transportation, and power systems, and are the core components of the systems. “Symmetry” means “the quality of being very similar or equal” or “the exact match in size and shape between two halves, parts or sides of something”. Symmetry is an important attribute of power converters. Whether it is a two-level, three-level, or multi-level converter, they all have a certain symmetry in structure， which is referred to as "Topological Symmetry of Power converters". This topological symmetry means that the voltage/current output from each phase of the converter are also symmetrical, with only a specific phase angle difference. Studying this symmetry is helpful for the design, operation analysis, and fault diagnosis of power converters.
  • 170
  • 19 Feb 2024
Topic Review
Topologies of T-Type Multilevel Inverters
Multilevel inverters (MLI) consist of a wide range of power converters. They have many designs and have been introduced with different circuit topologies such as neutral point clamped, diode clamped, cascaded H-bridges, and flying capacitors. Some of these MLIs have disadvantages, including design complexity, size, and losses due to the large number of switching devices required when they produce many output voltage levels. They are also bulky in size and may require several DC power sources. 
  • 427
  • 24 May 2023
Topic Review
Topologies for CMOS CP Circuits
CP design topologies have been analyzed with different design and process schemes in the last decades . 
  • 801
  • 08 Apr 2021
Topic Review
Top-Down Polyelectrolytes for Membrane-Based Post-Combustion CO2 Capture
Modern definition of polyelectrolytes (PEs) according to various sources describes them as polymer chains with charged monomer units that can dissolve into a charged macroion and small counterions upon the PE dissolution in a polar solvent. The PEs properties can be ascribed to three major categories: origin, matrix, and charge. The PEs origin associates with the source of the raw polymer precursor, where the molecules such as proteins, cellulose, and deoxyribonucleic acid (DNA) represent the natural PEs. Opposed, with the development of chemical synthesis and especially polymeric chemistry a large field of synthetic polyelectrolytes have emerged to accommodate the needs of petrochemical, pharmaceutical, water recovery, and other industries. These synthetic routes may roughly be distinguished as ‘bottom-up’ by monomer polymerisation and ‘top-down’ by post-synthetic modification of neutral polymers.
  • 729
  • 29 Oct 2021
Topic Review
Toothing
Toothing was originally a hoax claim that Bluetooth-enabled mobile phones or PDAs were being used to arrange random sexual encounters, perpetrated as a prank on the media who reported it. The hoax was created by Ste Curran, then Editor at Large at the gaming magazine Edge, and ex-journalist Simon Byron. They based it on the two concepts dogging and bluejacking that were popular at the time. The creators started a forum in March 2004 where they wrote fake news articles about toothing with other members and then sent them off to well-known Internet-based news services. The point of the hoax was to "highlight how journalists are happy to believe something is true without necessarily checking the facts". Dozens of news organizations, including BBC News, Wired News, and The Independent thought the toothing story was real and printed it. On April 4, 2005, Curran and Byron admitted that the whole thing was a hoax. There have, however, been real Bluetooth dating devices since.
  • 657
  • 27 Oct 2022
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