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Topic Review
Tapered Optical Fiber Configurations
Understanding environmental information is necessary for functions correlated with human activities to improve healthcare quality and reduce ecological risk. Tapered optical fibers reduce some limitations of such devices and can be considerably more responsive to fluorescence and absorption properties changes.
  • 2.2K
  • 05 Aug 2021
Topic Review
KS X 1001
KS X 1001, "Code for Information Interchange (Hangul and Hanja)", formerly called KS C 5601, is a South Korean coded character set standard to represent hangul and hanja characters on a computer. KS X 1001 is encoded by the most common legacy (pre-Unicode) character encodings for Korean, including EUC-KR and Microsoft's Unified Hangul Code (UHC). It contains Korean Hangul syllables, CJK ideographs (Hanja), Greek, Cyrillic, Japanese (Hiragana and Katakana) and some other characters. KS X 1001 is arranged as a 94×94 table, following the structure of 2-byte code words in ISO 2022 and EUC. Therefore, its code points are pairs of integers 1–94. However, some encodings (UHC and Johab), in addition to providing codes for every code point, provide additional codes for characters otherwise representable only as code point sequences.
  • 2.2K
  • 11 Oct 2022
Topic Review
Lithium-Ion Battery Capacity Estimation Methods for Management Systems
With the widespread use of Lithium-ion (Li-ion) batteries in Electric Vehicles (EVs), Hybrid EVs and Renewable Energy Systems (RESs), much attention has been given to Battery Management System (BMSs). By monitoring the terminal voltage, current and temperature, BMS can evaluate the status of the Li-ion batteries and manage the operation of cells in a battery pack, which is fundamental for the high efficiency operation of EVs and smart grids. Battery capacity estimation is one of the key functions in the BMS, and battery capacity indicates the maximum storage capability of a battery which is essential for the battery State-of-Charge (SOC) estimation and lifespan management.
  • 2.2K
  • 02 Dec 2022
Topic Review
Wood Vinegar as Antimicrobial Agent in Animal Husbandry
Wood vinegar (WV), also known as pyroligneous acid, as an alternative antimicrobial with good potential to replace conventional products. Many studies have demonstrated that WV is a promising product. WV is a nontoxic additive widely employed in the food industry to impart a smoked flavor to foods. Studies have shown that, depending on the WV concentration, good results can be achieved using it as an antimicrobial against pathogenic bacteria and fungi and a valuable growth promoter for poultry and pigs.
  • 2.2K
  • 13 Jan 2025
Topic Review
Liquid Mirror Telescope
Liquid mirror telescopes are telescopes with mirrors made with a reflective liquid. The most common liquid used is mercury, but other liquids will work as well (for example, low melting alloys of gallium). The liquid and its container are rotated at a constant speed around a vertical axis, which causes the surface of the liquid to assume a paraboloidal shape, suitable for use as the primary mirror of a reflecting telescope. The rotating liquid assumes the paraboloidal shape regardless of the container's shape. To reduce the amount of liquid metal needed, and thus weight, a rotating mercury mirror uses a container that is as close to the necessary parabolic shape as possible. Liquid mirrors can be a low cost alternative to conventional large telescopes. Compared to a solid glass mirror that must be cast, ground, and polished, a rotating liquid metal mirror is much less expensive to manufacture. Isaac Newton noted that the free surface of a rotating liquid forms a circular paraboloid and can therefore be used as a telescope, but he could not actually build one because he had no way to stabilize the speed of rotation. The concept was further developed by Ernesto Capocci of the Naples Observatory (1850), but it was not until 1872 that Henry Skey of Dunedin, New Zealand constructed the first working laboratory liquid mirror telescope. Another difficulty is that a liquid metal mirror can only be used in zenith telescopes, i.e., that look straight up, so it is not suitable for investigations where the telescope must remain pointing at the same location of inertial space (a possible exception to this rule may exist for a mercury mirror space telescope, where the effect of Earth's gravity is replaced by artificial gravity, perhaps by rotating the telescope on a very long tether, or propelling it gently forward with rockets). Only a telescope located at the North Pole or South Pole would offer a relatively static view of the sky, although the freezing point of mercury and the remoteness of the location would need to be considered. A very large telescope already exists at the South Pole, but the North Pole is located in the Arctic Ocean. The mercury mirror of the Large Zenith Telescope in Canada was the largest liquid metal mirror ever built. It had a diameter of six meters, and rotated at a rate of about 8.5 revolutions per minute. It is now decommissioned. This mirror was a test, built for $1 million but it was not suitable for astronomy because of the test site's weather. They are now planning to build a larger 8 meter liquid mirror telescope ALPACA for astronomical use and a larger project called LAMA with 66 individual 6.15 meter telescopes with a total collecting power equal to a 55 meter telescope, resolving power of a 70 meter scope.
  • 2.2K
  • 08 Oct 2022
Topic Review
Palladium-Catalyzed Carboxylation Reactions
The efficient incorporation of carbon dioxide into an organic substrate (carboxylation) under catalytic conditions to give high value added molecules is one of the most important and fascinating areas of current organic synthesis. Carbon dioxide is a nonflammable, inexpensive and largely available C-1 feedstock. In fact, it allows converting an important waste (it is well known that carbon dioxide is produced in enormous amounts from the combustion of fossil fuels for the production of energy) into a variety of useful compounds, which can find application as fuels or in the pharmaceutical or material fields.
  • 2.2K
  • 06 Jan 2022
Topic Review
TiO2 as Water Splitting Photocatalyst
Hydrogen produced from water using photocatalysts driven by sunlight is a sustainable way to overcome the intermittency issues of solar power and provide a green alternative to fossil fuels. TiO2 has been used as a photocatalyst since the 1970s due to its low cost, earth abundance, and stability. There has been a wide range of research activities in order to enhance the use of TiO2 as a photocatalyst using dopants, modifying the surface, or depositing noble metals. However, the issues such as wide bandgap, high electron-hole recombination time, and a large overpotential for the hydrogen evolution reaction (HER) persist as a challenge. Here, we review state-of-the-art experimental and theoretical research on TiO2 based photocatalysts and identify challenges that have to be focused on to drive the field further. We conclude with a discussion of four challenges for TiO2 photocatalysts—non-standardized presentation of results, bandgap in the ultraviolet (UV) region, lack of collaboration between experimental and theoretical work, and lack of large/small scale production facilities. We also highlight the importance of combining computational modeling with experimental work to make further advances in this exciting field.
  • 2.2K
  • 24 Mar 2021
Topic Review
Enhancing Lithium-Manganese Oxide Electrochemical Behavior
Lithium manganese oxide is regarded as a capable cathode material for lithium-ion batteries, but it suffers from relative low conductivity, manganese dissolution in electrolyte and structural distortion from cubic to tetragonal during elevated temperature tests. 
  • 2.2K
  • 27 Apr 2021
Topic Review
Chronic Wounds
The chronicity of wounds is affected by several contributory factors, including hormonal imbalances, cytokines, invasive microbial infections, and growth factors. More importantly, bacterial infections have been implicated as the predominant feature in most chronic wound microenvironments, including Staphylococcus aureus and Pseudomonas aeruginosa. These bacteria exist in polymicrobial forms forming biofilms that afford them protection against the host’s immunity and conventional antibiotics. S. aureus biofilms are sometimes present close to the surface of chronic wounds, while P. aeruginosa biofilms appear deep within wound tissue. The recalcitrant disposition of these microbes has been implicated as one of the causalities of antimicrobial resistance.
  • 2.2K
  • 17 May 2022
Topic Review
Impact of Oxidative Stress on Pediatrics Syndromes
Oxidative stress is a condition determined by an imbalance between antioxidant and oxidative factors. Oxidative stress can have serious consequences on our organism. Indeed, it causes both necrosis and cell apoptosis, determining cellular aging, increased carcinogenesis, vascular stiffening, increased autoimmune diseases, and muscle decay. 
  • 2.2K
  • 01 Nov 2022
Topic Review
AMPs Nisin and Food Preservation
This study reports the application of antimicrobial peptides (AMPs) in food preservation because of their ability to inactivate spores and spore-forming bacteria. The review focused more on nisin, which is one of the sufficiently characterised AMPs for use in the food industry. The mechanisms of spore-forming bacteria inactivation, the effectiveness of using nisin AMP alone and the synergistic effect of combining AMPs with other non-thermal emerging technologies were explored.
  • 2.2K
  • 24 Sep 2021
Topic Review
Artificial Downwelling
A technology that uses artificial methods to make sea water flow from top to bottom. The upper oxygen-rich water can be sent to the bottom hypoxic zone to alleviate marine environmental problems.
  • 2.2K
  • 30 Oct 2020
Topic Review
Bile Acids in Retinal Diseases
Bile acids (BAs) are amphipathic sterols primarily synthesized from cholesterol in the liver and released in the intestinal lumen upon food intake. BAs play important roles in micellination of dietary lipids, stimulating bile flow, promoting biliary phospholipid secretion, and regulating cholesterol synthesis and elimination. Emerging evidence, however, suggests that, aside from their conventional biological function, BAs are also important signaling molecules and therapeutic tools. In the last decade, the therapeutic applications of BAs in the treatment of ocular diseases have gained great interest. 
  • 2.2K
  • 22 Sep 2021
Topic Review
Morita Therapy
Morita therapy is an ecological, purpose-centered, response-oriented therapy created through case-based research by Shoma Morita, M.D. (1874–1938). Morita developed his theory of consciousness and medically-grounded four-stage progressive therapeutic method with rigor. The goal of Morita therapy is to have the patient accept life as it is. This does not mean that the patient cannot set and achieve goals, but be able to be satisfied with their life in the moment. Morita therapy places an emphasis on letting nature take its course. This is not to say that patients should be resigned to their mental illness but to respect the laws of nature. Feeling emotions is a law of nature according to Morita therapy. Morita therapy helps its patients understand that experiencing emotions, positive or negative, is a facet of being a human being. Morita describes his own therapy as follows: Morita therapy was originally developed to address shinkeishitsu, an outdated term used in Japan to describe patients who have various types of anxiety. Morita therapy was designed not to completely rid the patient of shinkeishitsu but to lessen the damaging effects. While Morita therapy has been described as cognate to Albert Ellis's rational-emotive therapy, this description does not account for the ecological foundation of the therapy. Morita therapy also has commonalities with existential and cognitive behavioral therapy.
  • 2.2K
  • 10 Nov 2022
Topic Review
Aromatic Hydrocarbon
An aromatic hydrocarbon or arene (or sometimes aryl hydrocarbon) is a hydrocarbon with sigma bonds and delocalized pi electrons between carbon atoms forming a circle. In contrast, aliphatic hydrocarbons lack this delocalization. The term "aromatic" was assigned before the physical mechanism determining aromaticity was discovered, and referred simply to the fact that many such compounds have a sweet or pleasant odour; however, not all aromatic compounds have a sweet odour, and not all compounds with a sweet odour are aromatic. The configuration of six carbon atoms in aromatic compounds is called a "benzene ring", after the simplest possible such hydrocarbon, benzene. Aromatic hydrocarbons can be monocyclic (MAH) or polycyclic (PAH). Not all aromatic compounds are benzene-based; aromaticity can also manifest in heteroarenes, which follow Hückel's rule (for monocyclic rings: when the number of its π electrons equals 4n + 2, where n = 0, 1, 2, 3, ...). In these compounds, at least one carbon atom is replaced by one of the heteroatoms oxygen, nitrogen, or sulfur. Examples of non-benzene compounds with aromatic properties are furan, a heterocyclic compound with a five-membered ring that includes a single oxygen atom, and pyridine, a heterocyclic compound with a six-membered ring containing one nitrogen atom.
  • 2.2K
  • 25 Nov 2022
Topic Review
Chinese Emperors Family Tree (Early)
This is a family tree of Chinese emperors from the foundation of the Qin dynasty in 221 BC (by Qin Shihuangdi), till the end of the Sixteen Kingdoms period, in the first half of the fifth century AD. Chinese emperors family tree (ancient) → Chinese emperors family tree (early) → Chinese emperors family tree (middle) → Chinese emperors family tree (late)
  • 2.2K
  • 29 Nov 2022
Topic Review
Starch-Based Polymer Materials as Adsorbents for Water Treatment
Owing to its non-toxicity, biodegradability, and biocompatibility, starch is a naturally occurring polysaccharide that scientists are looking into as a possible environmentally friendly material for sustainable water remediation. Starch could exhibit significant adsorption capabilities towards pollutants with the substitution of amide, amino, carboxyl, and other functional groups for hydroxyl groups. Starch derivatives may effectively remove contaminants such as oil, organic solvents, pesticides, heavy metals, dyes, and pharmaceutical pollutants by employing adsorption techniques at a rate greater than 90%. The maximal adsorption capacities of starch-based adsorbents for oil and organic solvents, pesticides, heavy metal ions, dyes, and pharmaceuticals are 13,000, 66, 2000, 25,000, and 782 mg/g, respectively.
  • 2.2K
  • 25 Jul 2023
Topic Review
Spherical Nanoparticles
An up-to-date overview of the current state of the art of polysaccharide-based spherical particles as carriers of active/bioactive substances, with a particular emphasis on their applications in the food industry, is provided. Owing to the rapid advances in nanotechnology, much effort has been dedicated to the synthesis and potential uses of these particles.
  • 2.2K
  • 03 Nov 2023
Topic Review
Plant Growth in Altered Gravity/Microgravity
Understanding how plants respond and adapt to extraterrestrial conditions is essential for space exploration initiatives. Deleterious effects of the space environment on plant development have been reported, such as the unbalance of cell growth and proliferation in the root meristem, or gene expression reprogramming. However, plants are capable of surviving and completing the seed-to-seed life cycle under microgravity. A key research challenge is to identify environmental cues, such as light, which could compensate the negative effects of microgravity.
  • 2.2K
  • 31 Oct 2022
Topic Review
Thermal Management System
In gas turbine engines, Thermal Management (TM) is a concept of utilising the engine fluid systems to extract the excess heat generated within the various components and systems of the engine as well as employing the extracted heat for multiple functions that would improve the engine’s performance.
  • 2.2K
  • 14 Jan 2022
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