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Topic Review
Hybrid Ship Propulsion Systems
Following the trends in the automobile industry, hybrid electric propulsion systems have been proposed and used in ships to achieve higher efficiency, mitigate carbon emissions and reduce overall operational costs by combining traditional mechanical propulsion with electrical propulsion. Studies have been conducted on the diverse types of hybrid marine power systems to understand the behaviour of the ships at different operating and loading conditions to optimise the cost function of the hybrid system model. 
  • 4.2K
  • 06 Jan 2023
Topic Review
Darwin's Fox
Darwin's Fox (Lycalopex fulvipes) is a critically endangered canid species native to Chile, particularly inhabiting the temperate rainforests of Chiloé Island and the Nahuelbuta Range. Named after the renowned naturalist Charles Darwin, this elusive fox is characterized by its small size, reddish-brown fur, and distinctively bushy tail. Threatened by habitat loss, predation by introduced species, and disease, Darwin's Fox faces significant conservation challenges, with concerted efforts underway to protect and preserve this rare and iconic species.
  • 4.2K
  • 08 Mar 2024
Topic Review
Maquis Du Vercors
The Maquis du Vercors was a rural group of the French Forces of the Interior (FFI) (maquis) that resisted the 1940–1944 German occupation of France in World War II. The Maquis du Vercors used the prominent scenic plateau known as the Massif du Vercors (Vercors Plateau) as a refuge. Initially the maquis carried out only sabotage and partisan operations against the Germans, but after the Normandy Invasion on 6 June 1944, the leadership of an army of about 4,000 maquis declared the "Free Republic of Vercors," raised the French flag, and attempted to create a conventional army to oppose the German occupation. The allies supported the maquis with parachute drops of weapons and by supplying teams of advisors and trainers, but the uprising was premature. In July 1944 as many as 10,000 German soldiers invaded the massif and killed more than 600 of the maquis, known as maquisards, and 200 civilians. It was German's largest anti-partisan operation in Western Europe during World War II. In August 1944, shortly after the battle for the Vercors, the area was liberated from German control by the American army allied with the FFI.
  • 4.2K
  • 20 Oct 2022
Topic Review
Closed-Loop Supply Chain
A CLSC can be defined as “a supply chain system entailing design and implementation for enhancing the useful value throughout the product life cycle while dynamically extracting value from different returned products”[1].
  • 4.2K
  • 23 Oct 2020
Topic Review
Valence
In chemistry, the valence (US spelling) or valency (British spelling) of an element is the measure of its combining capacity with other atoms when it forms chemical compounds or molecules.
  • 4.2K
  • 02 Nov 2022
Topic Review
Types of Snow
Types of snow can be designated by the shape of its flakes, description of how it is falling, and by how it collects on the ground. A blizzard and snow storm indicate heavy snowfalls over a large area, snow squalls give heavy snowfalls over narrow bands, while flurries are used for the lightest snowfall. Types which fall in the form of a ball, rather than a flake, are known as graupel, with sleet and snow grains as types of graupel. Once on the ground, snow can be categorized as powdery when fluffy, granular when it begins the cycle of melting and refreezing, and crud or eventually ice once it packs down into a dense drift after multiple melting and refreezing cycles. When powdering, snow drifts with the wind or ground blizzard, sometimes to the depth of several metres. After attaching to hillsides, blown snow can evolve into a snow slab, which is an avalanche hazard on steep slopes.
  • 4.2K
  • 04 Nov 2022
Topic Review
Dragon King Theory
Dragon king (DK) is a double metaphor for an event that is both extremely large in size or impact (a "king") and born of unique origins (a "dragon") relative to its peers (other events from the same system). DK events are generated by / correspond to mechanisms such as positive feedback, tipping points, bifurcations, and phase transitions, that tend to occur in nonlinear and complex systems, and serve to amplify DK events to extreme levels. By understanding and monitoring these dynamics, some predictability of such events may be obtained. The theory has been developed by Didier Sornette, who hypothesizes that many of the crises that we face are in fact DK rather than black swans—i.e., they may be predictable to some degree. Given the importance of crises to the long-term organization of a variety of systems, the DK theory urges that special attention be given to the study and monitoring of extremes, and that a dynamic view be taken. From a scientific viewpoint, such extremes are interesting because they may reveal underlying, often hidden, organizing principles. Practically speaking, one should study extreme risks, but not forget that significant uncertainty will almost always be present, and should be rigorously considered in decisions regarding risk management and design. The theory of DK is related to concepts such as black swan theory, outliers, complex systems, nonlinear dynamics, power laws, extreme value theory, prediction, extreme risks, and risk management.
  • 4.2K
  • 23 Oct 2022
Topic Review
Marine Isotope Stage
Marine isotope stages (MIS), marine oxygen-isotope stages, or oxygen isotope stages (OIS), are alternating warm and cool periods in the Earth's paleoclimate, deduced from oxygen isotope data reflecting changes in temperature derived from data from deep sea core samples. Working backwards from the present, which is MIS 1 in the scale, stages with even numbers have high levels of oxygen-18 and represent cold glacial periods, while the odd-numbered stages are lows in the oxygen-18 figures, representing warm interglacial intervals. The data are derived from pollen and foraminifera (plankton) remains in drilled marine sediment cores, sapropels, and other data that reflect historic climate; these are called proxies. The MIS timescale was developed from the pioneering work of Cesare Emiliani in the 1950s, and is now widely used in archaeology and other fields to express dating in the Quaternary period (the last 2.6 million years), as well as providing the fullest and best data for that period for paleoclimatology or the study of the early climate of the Earth, representing "the standard to which we correlate other Quaternary climate records". Emiliani's work in turn depended on Harold Urey's prediction in a paper of 1947 that the ratio between oxygen-18 and oxygen-16 isotopes in calcite, the main chemical component of the shells and other hard parts of a wide range of marine organisms, should vary depending on the prevailing water temperature in which the calcite was formed. Over 100 stages have been identified, currently going back some 6 million years, and the scale may in future reach back up to 15 mya. Some stages, in particular MIS 5, are divided into sub-stages, such as "MIS 5a", with 5 a, c, and e being warm and b and d cold. A numeric system for referring to "horizons" (events rather than periods) may also be used, with for example MIS 5.5 representing the peak point of MIS 5e, and 5.51, 5.52 etc. representing the peaks and troughs of the record at a still more detailed level. For more recent periods, increasingly precise resolution of timing continues to be developed.
  • 4.2K
  • 03 Nov 2022
Topic Review
Applications of Liquid Crystals-Based Sensors
Liquid crystals are a class of chemical substances that exist in intermediate states between crystalline solids and liquids. They thus share the anisotropic properties of crystalline solids as well as fluid properties of isotropic liquids. 
  • 4.2K
  • 23 Mar 2022
Topic Review
Flat Twin Engine
A flat-twin is a two-cylinder internal combustion engine with the cylinders on opposite sides of the crankshaft. It is a flat engine with two cylinders. Used in motorcycles for more than a century, flat-twins have also been used in automobiles, light aircraft, stationary powerplants, and household appliances. Early flat-twin motorcycles' engines were mounted with the cylinders in line with the frame. This caused uneven cooling of the cylinders and required the motorcycle to have a long wheelbase. Later flat-twin motorcycles' engines were mounted with their cylinders across the frame for better air cooling and a shorter wheelbase. Disadvantages of this layout include torque reaction in the motorcycle in turns and the potential to damage cylinder heads.
  • 4.2K
  • 27 Oct 2022
Topic Review
Concepts, Procedures and Techniques by Forensic Entomologists
Forensic entomology is a branch of forensic science that incorporates insects as a part of solving crime. Insect-based evidence recovered at a crime scene can be used to estimate the minimum postmortem interval, determine if a carcass/corpse has been relocated, and contribute to the cause and manner of death. Sampling and preservation of insect material is paramount if this evidence is presented in court.  To this end, a qualified forensic entomologist should attend the crime scene, however this is not always the case and such evidence is collected and preserved by a proxy.  After reading this paper and following a number of essential protocols, a proxy should be able to submit insect evidence that a forensic entomologist may be able to use and present a best estimate of the time since death.
  • 4.2K
  • 19 Jun 2023
Topic Review
Stakeholder Engagement for Infrastructure Projects
The world is experiencing a major cycle of investment in infrastructure, which is essential for the development and prosperity of countries and societies. Management failures in infrastructure projects are widely known, and some of them involve the weak engagement of project stakeholders. The importance of stakeholder involvement as a key factor in the success of infrastructure projects is widely recognized.
  • 4.2K
  • 25 Jul 2023
Topic Review
Solidarity
Solidarity refers to the unity, cohesion, and mutual support among individuals or groups, often based on shared values, interests, or experiences. It represents a sense of common purpose, identity, and commitment to collective well-being, fostering cooperation, empathy, and reciprocity within social contexts. Solidarity can manifest in various forms, including social, political, economic, and cultural solidarity, and plays a crucial role in promoting social cohesion, resilience, and solidarity within communities and societies.
  • 4.2K
  • 26 Jan 2024
Topic Review
Luminogens with Aggregation-Induced Emission
Luminogens with aggregation-induced emission (AIEgens) have been widely applied in the field of photodynamic therapy. Among them, aggregation-induced emission photosensitizers (AIE–PSs) are demonstrated with high capability in fluorescence and photoacoustic bimodal imaging, as well as in fluorescence imaging-guided photodynamic therapy. They not only improve diagnosis accuracy but also provide an efficient theranostic platform to accelerate preclinical translation as well.
  • 4.2K
  • 21 Jan 2021
Topic Review
Family Language Policy
Family and its language are one of the most important domains when it comes to acquiring a language as a mother tongue. 
  • 4.2K
  • 24 Aug 2022
Topic Review Peer Reviewed
Financial Interdependence: A Social Perspective
Financial interdependence refers to the practice of sharing money as an expression of mutuality. Forms of financial interdependence are often rooted in cultural norms and values and may be carried out as a commitment to the well-being of the family through financial transfers, practiced as informal savings groups, or even established as legally constructed agreements. Financial interdependence can result in either beneficial or harmful outcomes, depending upon the nature of the relationships and the available resources. As a social and cultural concept, it has been generally neglected in the discourse on financial independence, yet it has important implications for society as a basis for collective prosperity.
  • 4.2K
  • 28 Aug 2023
Topic Review
Carbon Nanotube Field-Effect Transistor
Carbon nanotubes (CNTs) are seamless nanotubes made of single or multiple layers of graphene sheets rolled around a central axis with the advantages of being lightweight and having a perfect hexagonal connection structure.
  • 4.2K
  • 29 Mar 2021
Topic Review
Ultrasensitive Magnetic Field Sensors
One of the cutting-edge topics today is the use of magnetic field sensors for applications such as magnetocardiography, magnetotomography, magnetomyography, magnetoneurography, or their application in point-of-care devices. Types of magnetic field sensors include direct current superconducting quantum interference devices, search coil, fluxgate, magnetoelectric, giant magneto-impedance, anisotropic/giant/tunneling magnetoresistance, optically pumped, cavity optomechanical, Hall effect, magnetoelastic, spin wave interferometry, and those based on the behavior of nitrogen-vacancy centers in the atomic lattice of diamond. Current developments of magnetometry in biological diagnostics are revised in review paper DOI: 10.3390/s20061569.
  • 4.2K
  • 11 Jun 2021
Topic Review
Burn Pathophysiology
Burns are a widespread global public health traumatic injury affecting many people worldwide. Non-fatal burn injuries are a leading cause of morbidity, resulting in prolonged hospitalization, disfigurement, and disability, often with resulting stigma and rejection. The treatment of burns is aimed at controlling pain, removing dead tissue, preventing infection, reducing scarring risk, and tissue regeneration. 
  • 4.2K
  • 26 May 2023
Topic Review
Agricultural Extension for Smallholder Farmers
The creation of commercialization opportunities for smallholder farmers has taken primacy on the development agenda of many developing countries. Invariably, most of the smallholders are less productive than commercial farmers and continue to lag in commercialization. Apart from the various multifaceted challenges which smallholder farmers face, limited access to agricultural extension services stands as the underlying constraint to their sustainability. 
  • 4.2K
  • 02 Jul 2021
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