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Topic Review
Frogs in Culture
Frogs play a variety of roles in culture, appearing in folklore and fairy tales such as the Brothers Grimm story of The Frog Prince. In ancient Egypt and Mesopotamia, frogs symbolized fertility, while in classical antiquity, the Greeks and Romans associated frogs with fertility, harmony, and licentiousness. Frogs are the subjects of fables attributed to Aesop, of proverbs in various cultures, and of art. Frog characters such as Kermit the frog and Pepe the Frog feature in popular culture. They are eaten in some parts of the world including France. In Australia, a fondant dessert is known as frog cake.
  • 5.4K
  • 27 Nov 2022
Topic Review
New Seismotectonic Atlas of Greece
Integration and harmonization of the most recent seismological, geological, tectonic, geophysical and geodetic datasets, with the aim of capturing the potential of ground deformation towards a more reliable evaluation of seismic risk at a national level.
  • 5.4K
  • 20 Nov 2020
Topic Review
Pre-Existence
Pre-existence, preexistence, beforelife, or premortal existence refers to the belief that each individual human soul existed before mortal conception, and at some point before birth enters or is placed into the body. Concepts of pre-existence can encompass either the belief that the soul came into existence at some time prior to conception or the belief that the soul is eternal. Alternative positions are traducianism and creationism, which both hold that the individual human soul does not come into existence until conception. It is to be distinguished from preformation, which is about physical existence and applies to all living things. Ancient Greek thought and Islam affirm pre-existence, but it is generally denied in Christianity.
  • 5.4K
  • 08 Nov 2022
Topic Review
Biological Effects and Mechanisms of Electromagnetic Radiation
Modern humanity wades daily through various radiations, resulting in frequent exposure and causing potentially important biological effects. Among them, the brain is the organ most sensitive to electromagnetic radiation (EMR) exposure.
  • 5.4K
  • 31 Aug 2022
Topic Review
Christian Views on Hell
In Christian theology, Hell is the place or state into which, by God's definitive judgment, unrepentant sinners pass in the general judgment, or, as some Christians believe, immediately after death (particular judgment). Its character is inferred from teaching in the biblical texts, some of which, interpreted literally, have given rise to the popular idea of Hell. Theologians today generally see Hell as the logical consequence of using free will to reject union with God and, because God will not force conformity, it is not incompatible with God's justice and mercy. Different Hebrew and Greek words are translated as "Hell" in most English-language Bibles. These words include: "Sheol" in the Hebrew Bible, and "Hades" in the New Testament. Many modern versions, such as the New International Version, translate Sheol as "grave" and simply transliterate "Hades". It is generally agreed that both sheol and hades do not typically refer to the place of eternal punishment, but to the grave, the temporary abode of the dead, the underworld. "Gehenna" in the New Testament, where it is described as a place where both soul and body could be destroyed (Matthew 10:28) in "unquenchable fire" (Mark 9:43). The word is translated as either "Hell" or "Hell fire" in many English versions. Gehenna was a physical location outside the city walls where they burned garbage and where lepers and outcasts were sent, hence the weeping and gnashing of teeth. The Greek verb ταρταρῶ (tartarō, derived from Tartarus), which occurs once in the New Testament (in 2 Peter 2:4), is almost always translated by a phrase such as "thrown down to hell". A few translations render it as "Tartarus"; of this term, the Holman Christian Standard Bible states: "Tartarus is a Greek name for a subterranean place of divine punishment lower than Hades."
  • 5.4K
  • 18 Oct 2022
Topic Review
Different Composting Technologies
Organic waste management is a major global challenge. It accounts for a significant portion of waste that ends up in landfills, where it gradually decomposes and emits methane, a harmful greenhouse gas. Composting is the most preferred method for managing organic waste, as it applies to the masses, may not require significant areas, and of course, is capable of reducing the rate of the production of waste, while at the same time, producing valuable by-products, in the form of compost with potentially reducing the amount of greenhouse gas emissions, if done properly.
  • 5.4K
  • 23 Sep 2022
Topic Review
Networked Control System
An NCS consists of control loops joined through communication networks in which both the control signal and the feedback signal are exchanged between the system and the controller.
  • 5.4K
  • 01 Apr 2021
Topic Review
The Photosynthetic Apparatus of Plants
Chlorophylls together with carotenoids, serve, noncovalently bound to specific apoproteins, as principal light-harvesting and energy-transforming pigments in oxygenic photosynthetic organisms, including plants.
  • 5.4K
  • 10 Jun 2021
Topic Review
Old Aramaic Language
Old Aramaic refers to the earliest stage of the Aramaic language, considered to give way to Middle Aramaic by the 3rd century (a conventional date is the rise of the Sasanian Empire in 224 AD). Emerging as the language of the city-states of the Arameans in the Levant in the Early Iron Age, Old Aramaic was adopted as a lingua franca, and in this role was inherited for official use by the Achaemenid Empire during classical antiquity. After the fall of the Achaemenid Empire, local vernaculars became increasingly prominent, fanning the divergence of an Aramaic dialect continuum and the development of differing written standards.
  • 5.4K
  • 21 Oct 2022
Topic Review
Biomass Gasification
Lignocellulosic gasification is a valid thermochemical approach for the conversion of organic solid matter into a gaseous mixture that is constituted of hydrogen, carbon monoxide, carbon dioxide and methane, named synthetic gas or syngas. Although about 55% of syngas is still produced from coal, biomass utilization, especially lignocellulose, is constantly growing. Indeed, gasification could be potentially applied to all different kinds of lignocellulosic biomass, unlike other conversion technologies. Moreover, in the last few decades, a wide range of applications of syngas have been intensively studied. Syngas can be directly used as a combustible substance in power plants for heat and power production (steam cycle, co-combustion, combustion in gas turbines or internal combustion engines, high temperature fuel cells), which represents the most common use of biomass-derived syngas. However, syngas also represents a platform that can be employed in a broad range of chemical and microbial processes, leading to gaseous and liquid fuels, as well as to chemicals. Chemical process research has mainly focused on transportation fuel production from syngas, such as Fischer–Tropsch liquid fuels, hydrogen, methanol, dimethyl ether (DME), mixed alcohols, and synthetic natural gas (SNG). Instead, the biochemical conversion route consists of syngas fermentation in which obligate anaerobic microorganisms convert syngas into organic acids, alcohols, and other chemicals. The most commonly used microorganisms are acetogens, which use the Wood–Ljungdahl metabolic pathway. Syngas fermentation is defined as an indirect fermentation process because biomass is not fed directly into the fermenter, but it is previously converted into syngas through gasification. 
  • 5.4K
  • 17 Dec 2020
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