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Topic Review
Bauxite Tailings
Bauxite tailings, also known as bauxite residue, red mud, red sludge, or alumina refinery residues (ARR), is a highly alkaline waste product composed mainly of iron oxide that is generated in the industrial production of alumina (aluminium oxide, the principal raw material used in the manufacture of aluminium metal and also widely used in the manufacture of ceramics, abrasives and refractories). It is important to differentiate between the alkaline waste generated in the Bayer process and the tailings generated during the mining of bauxite. This article specifically covers the alkaline waste generated when operating the Bayer process. The scale of production makes the waste product an important one, and issues with its storage are reviewed and every opportunity is explored to find uses for it. Over 95% of the alumina produced globally is through the Bayer process; for every tonne of alumina produced, approximately 1 to 1.5 tonnes of bauxite tailings/residue are also produced. Annual production of alumina in 2018 was approximately 126 million tonnes resulting in the generation of over 160 million tonnes of bauxite tailings/residue.
  • 3.6K
  • 02 Nov 2022
Topic Review
International Humanist and Ethical Union
The International Humanist and Ethical Union (IHEU) is an umbrella organisation of humanist, atheist, rationalist, secular, skeptic, freethought and Ethical Culture organisations worldwide. British philosopher and biologist Julian Huxley (also the first director of UNESCO) presided over the founding Congress of the IHEU in Amsterdam, 1952; Dutch philosopher and politician Jaap van Praag became its first chairman until 1975. The IHEU works "to build and represent the global Humanist movement that defends human rights and promotes Humanist values world-wide." In 2002, the IHEU General Assembly unanimously adopted the Amsterdam Declaration 2002, which presents as the "official defining statement of World Humanism". The Happy Human is the official symbol of the IHEU. IHEU holds a World Humanist Congress usually every three years. The next is to be held in Miami, United States , in 2020.
  • 3.6K
  • 24 Nov 2022
Topic Review
Development of Analogs of Thalidomide
The development of analogs of thalidomide was precipitated by the discovery of the anti-angiogenic and anti-inflammatory properties of the drug yielding a new way of fighting cancer as well as some inflammatory diseases after it had been banned in 1961. The problems with thalidomide included; teratogenic side effects, high incidence of other adverse reactions, poor solubility in water and poor absorption from the intestines. In 1998 thalidomide was approved by the U.S. Food and Drug Administration (FDA) for use in newly diagnosed multiple myeloma (MM) under strict regulations. This has led to the development of a number of analogs with fewer side effects and increased potency which include lenalidomide, pomalidomide and apremilast, all of which are currently marketed and manufactured by Celgene.
  • 3.6K
  • 02 Nov 2022
Topic Review
Oral Mucosal Pain
The oral cavity is a portal into the digestive system, which exhibits unique sensory properties. Like facial skin, the oral mucosa needs to be exquisitely sensitive and selective, in order to detect harmful toxins versus edible food. Chemosensation and somatosensation by multiple receptors, including transient receptor potential channels, are well-developed to meet these needs. In contrast to facial skin, however, the oral mucosa rarely exhibits itch responses. Like the gut, the oral cavity performs mechanical and chemical digestion. Therefore, the oral mucosa needs to be insensitive, to some degree, in order to endure noxious irritation. Persistent pain from the oral mucosa is often due to ulcers, involving both tissue injury and infection. Trigeminal nerve injury and trigeminal neuralgia produce intractable pain in the orofacial skin and the oral mucosa, through mechanisms distinct from those seen in the spinal area, which is particularly difficult to predict or treat. The diagnosis and treatment of idiopathic chronic pain, such as atypical odontalgia (idiopathic painful trigeminal neuropathy or post-traumatic trigeminal neuropathy) and burning mouth syndrome, remain especially challenging. The central integration of gustatory inputs might modulate chronic oral and facial pain. A lack of pain in chronic inflammation inside the oral cavity, such as chronic periodontitis, involves the specialized functioning of oral bacteria. A more detailed understanding of the unique neurobiology of pain from the orofacial skin and the oral mucosa should help us develop novel methods for better treating persistent orofacial pain.
  • 3.6K
  • 08 Jun 2021
Topic Review
Pencil (Mathematics)
In geometry, a pencil is a family of geometric objects with a common property, for example the set of lines that pass through a given point in a plane, or the set of circles that pass through two given points in a plane. Although the definition of a pencil is rather vague, the common characteristic is that the pencil is completely determined by any two of its members. Analogously, a set of geometric objects that are determined by any three of its members is called a bundle. Thus, the set of all lines through a point in three-space is a bundle of lines, any two of which determine a pencil of lines. To emphasize the two dimensional nature of such a pencil, it is sometimes referred to as a flat pencil Any geometric object can be used in a pencil. The common ones are lines, planes, circles, conics, spheres and general curves. Even points can be used. A pencil of points is the set of all points on a given line. A more common term for this set is a range of points.
  • 3.6K
  • 10 Oct 2022
Topic Review
Nanoparticles as Drug Delivery Systems
The application of inventions or products from nanotechnology has revolutionised all aspects of everyday life ranging from medical applications to its impact on the food industry. Nanoparticles have made it possible to significantly extend the shelf lives of food product, improve intracellular delivery of hydrophobic drugs and improve the efficacy of specific therapeutics such as anticancer agents. 
  • 3.6K
  • 19 Jun 2023
Topic Review
Gingival Crevicular Fluid
The Gingival Crevicular Fluid (GCF) consists of various host and bacterial-derived products as well as biomarkers which in turn can be evaluated for the diagnosis, prognosis as well as management of the periodontal disease. 
  • 3.6K
  • 23 Apr 2021
Topic Review
BibTeX
BibTeX is reference management software for formatting lists of references. The BibTeX tool is typically used together with the LaTeX document preparation system. Within the typesetting system, its name is styled as [math]\displaystyle{ {\mathrm{B{\scriptstyle{IB}} \! T\!_{\displaystyle E} \! X}} }[/math]. The name is a portmanteau of the word bibliography and the name of the TeX typesetting software. The purpose of BibTeX is to make it easy to cite sources in a consistent manner, by separating bibliographic information from the presentation of this information, similarly to the separation of content and presentation/style supported by LaTeX itself.
  • 3.6K
  • 14 Nov 2022
Topic Review
Steel for Nuclear Pressure Vessels
The nuclear reactor pressure vessel is an important component of a nuclear power plant. It has been used in harsh environments such as high temperature, high pressure, neutron irradiation, thermal aging, corrosion and fatigue for a long time, which puts forward higher standards for the performance requirements for nuclear pressure vessel steel.
  • 3.6K
  • 22 Dec 2022
Topic Review
Sultana (Title)
Sultana or sultanah (/sʌlˈtɑːnə/; Arabic: سلطانة sulṭāna) is a female royal title, and the feminine form of the word sultan. This term has been officially used for female monarchs in some Islamic states, and historically it was also used for sultan's consorts.
  • 3.6K
  • 17 Nov 2022
Topic Review
Battery Energy Storage and Management in Electric Vehicles
Electric vehicle (EV) technology has received massive attention worldwide due to its improved performance efficiency and significant contributions to addressing carbon emission problems. In line with that, EVs could play a vital role in achieving sustainable development goals (SDGs). EVs have a substantial influence on various goals of sustainable development, such as affordable and clean energy, sustainable cities and communities, industry, economic growth, and climate actions.
  • 3.6K
  • 08 Oct 2022
Topic Review
Imagined Interaction
Imagined interactions (IIs) are a type of social cognition and mental imagery grounded in symbolic interactionism in which individuals imagine conversations with significant others for a variety of purposes (Honeycutt, 2003; 2015). The research program was founded and created by James M. Honeycutt in 1987, who was designated an LSU Distinguished Professor in 2012. He provided a keynote address at the American Association for the Study of Mental Imagery at Yale University in 1987 discussing the functions of imagined interactions and mental imagery. In 2006, Honeycutt's book, "Imagined Interactions: Daydreaming about Communication" (2003), was awarded Distinguished Book of the Year by the National Communication Association for developing the original formulations and the II construct which has provided a beneficial mechanism for operationalizing the study of intrapersonal communication, social cognition, daydreaming, and mental imagery. Furthermore, imagined interactions can be used in sports imagery as athletes "imagine" positive outcomes of their executions on specific plays or formations (Keaton, Gearhart, & Honeycutt, 2014).
  • 3.6K
  • 15 Nov 2022
Topic Review
Sustainable Water Resources Management in Saudi Arabia
Saudi Arabia is one of the most water-scarce nations in the world, with a huge demand-supply gap, and the situation is expected to worsen due to climate change. Conventional surface water resources are limited, while nonrenewable groundwater sources are depleted. To build a more resilient and sustainable water sector, the production of non-conventional water resources, specifically desalinated seawater and treated domestic wastewater, has steadily increased in recent years. As the country lacks perennial water resources, such as rivers or water bodies, it relies mainly on nonrenewable groundwater and desalinated water to meet its daily requirements. Although the government is attempting to regulate the agricultural sector, water consumption in agriculture remains relatively high. It presents an environmental challenge due to its heavy reliance on non-renewable groundwater resources. The anticipated increase in temperature and highly uncertain changes in the rainfall patterns in Saudi Arabia could lead to greater uncertainty when attempting to develop effective water resource management plans.
  • 3.6K
  • 22 Dec 2023
Topic Review
Aggregation-Induced Emission and Fluorescent Mechanochromism
Mechanochromic fluorescent polymers are defined as materials that are able to detect a mechanical stress through a fluorescence output. This feature has evoked a growing interest in the last decades, thanks to the progress of fluorogenic molecules whose optical characteristics and chemical functionalities allow their effective insertion in many thermoplastic and thermoset matrices. Among the different types of fluorogenic probes able to detect mechanical solicitations, those with aggregation-induced emission (i.e., AIEgens) have attracted tremendous interest since their discovery in 2001. In this contribution, the main principles behind the AIEgens working behavior are introduced along with the current state of knowledge concerning the design and preparation of the derived mechanochromic fluorescent polymers. Examples are provided concerning the most ingenious solution for the preparation of chromogenic materials, starting from dierent types of commodity plastics or synthetic polymers and combined with the latest AIE technology to provide the most sensitive response to mechanical stress.
  • 3.6K
  • 30 Oct 2020
Topic Review
Carbon-based Materials for Hydrogen Storage
Carbon in its various forms (e.g., nanotubes, fullerenes, graphene) create a family of substances that enable the storage of large amounts of hydrogen in a reversible manner, which is confirmed by both computer simulations and experimental results.The main contraindication to using hydrogen as an energy source in mobile applications is still the low gravimetric density achieved by the available systems (according to the recommendations of the US Department of Energy, it should be 6 wt.%).
  • 3.6K
  • 27 May 2021
Topic Review
Solid State Transformers in Distribution System
Solid State Transformer (SST) is considered to be the most suitable and appropriate conversion device to replace the traditional prevailing transformer. In this device, the weight/volume savings, extensive efficiency enhancement and above all, the cost economization are taken to be the hallmarks. SST configuration comprises of three main stages (i.e., a rectifier, isolation through the HF transformer and finally the DC-AC converter to reproduce line frequency AC).
  • 3.6K
  • 01 Dec 2022
Topic Review
Digitalization of the Restaurant Industry
The COVID-19 pandemic had a severe impact on the restaurant industry. Temporary shutdowns and seating capacity restrictions led to a sharp drop in sales. In this scenario, digitalization emerged as a crucial strategy for business survival, offering opportunities to increase restaurants’ competitiveness and revenues. 
  • 3.6K
  • 30 Nov 2023
Topic Review
Strychnine Poisoning
Strychnine poisoning can be fatal to humans and other animals and can occur by inhalation, swallowing or absorption through eyes or mouth. It produces some of the most dramatic and painful symptoms of any known toxic reaction, making it quite noticeable and a common choice for assassinations and poison attacks. For this reason, strychnine poisoning is often portrayed in literature and film, such as the murder mysteries written by Agatha Christie. The probable lethal oral dose in humans is 1.5 to 2 mg/kg. Similarly, the median lethal dose for dogs, cats, and rats ranges from 0.5 to 2.35 mg/kg.
  • 3.6K
  • 01 Dec 2022
Topic Review
Application of Gas Foil Bearings
Gas foil bearing has been widely used in high-speed turbo machinery due to its oil-free, wide temperature range, low cost, high adaptability, high stability and environmental friendliness. In this paper, state-of-the-art investigations of gas foil bearings are reviewed, mainly on the development of the high-speed turbo machinery in China. After decades of development, progress has been achieved in the field of gas foil bearing in China. Small-scale applications of gas foil bearing have been realized in a variety of high-speed turbo machinery. The prospects and markets of high-speed turbo machinery are very broad. Various high-speed turbomachines with gas foil bearings have been developed. Due to the different application occasions, higher reliability requirements are imposed on the foil bearing technology. Therefore, its design principle, theory, and manufacturing technology should be adaptive to new application occasions before mass production. Thus, there are still a number of inherent challenges that must be addressed, for example, thermal management, rotor-dynamic stability and wear-resistant coatings.
  • 3.6K
  • 16 Jul 2021
Topic Review
Fluidic Thrust Vectoring in Jet Engine Nozzles
Thrust vectoring innovations are demonstrated ideas that improve the projection of aerospace power with enhanced maneuverability, control effectiveness, survivability, performance, and stealth. Thrust vector control systems following a variety of concepts have been considered for modern aircraft and missiles to enhance their military performance. Short Take-off and Landing (STOL) and control effectiveness at lower aircraft speeds can be achieved by employing Fluidic Thrust Vectoring Control (FTVC).
  • 3.6K
  • 10 Aug 2023
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