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Topic Review
Alpha (Ethology)
In studies of social animals, the highest ranking individual of a dominance hierarchy is sometimes designated as the alpha. Males, females, or both, can be alphas, depending on the species. Where one male and one female fulfill this role together, they are sometimes referred to as the alpha pair. Other animals in the same social group may exhibit deference or other species-specific subordinate behavior towards the alpha or alphas. Alpha animals usually gain preferential access to food and other desirable items or activities, though the extent of this varies widely between species. Male or female alphas may gain preferential access to sex or mates; in some species, only alphas or an alpha pair reproduce. Alphas may achieve their status by superior physical strength and aggression, or through social efforts and building alliances within the group, or more often, simply by breeding and being the parent of all in their pack. The individual with alpha status sometimes changes, often through a fight between the dominant and a subordinate animal. These fights are often to the death, depending on the animal.
  • 14.0K
  • 04 Nov 2022
Topic Review
Direct Rule
Direct rule is when an imperial or central power takes direct control over the legislature, executive and civil administration of an otherwise largely self-governing territory.
  • 14.0K
  • 01 Nov 2022
Topic Review
Pi-Stacking
In chemistry, pi stacking (also called π–π stacking) refers to the presumptive attractive, noncovalent interactions (orbital overlap) between the pi bonds of aromatic rings. However this is a misleading description of the phenomena since direct stacking of aromatic rings (the "sandwich interaction") is electrostatically repulsive. What is more commonly observed (see figure to the right) is either a staggered stacking (parallel displaced) or pi-teeing (perpendicular T-shaped) interaction both of which are electrostatic attractive For example, the most commonly observed interactions between aromatic rings of amino acid residues in proteins is a stagered stacked followed by a perpendular orientation. Sandwiched orientations are relatively rare. Pi stacking is repulsive as it places carbon atoms with partial negative charges from one ring on top of other partial negatively charged carbon atoms from the second ring and hydrogen atoms with partial postive charges on top of other hydrogen atoms that likewise carry partial positive charges. In staggered stacking, one of the two aromatic rings is offset sideways so that the carbon atoms with partial negative charge in the first ring are placed above hydrogen atoms with partial positive charge in the second ring so that the electrostatic interactions become attractive. Likewise, pi-teeing interactions in which the two rings are oriented perpendicultar to either other is electrostatically attractive as it places partial postively charged hydrogen atoms in close proximity to partially negatively charged carbon atoms. An alternative explanation for the preference for staggered stacking is due to the balance between van der Waals interactions (attractive dispersion plus Pauli repulsion). These staggered stacking and π-teeing interactions between aromatic rings are important in nucleobase stacking within DNA and RNA molecules, protein folding, template-directed synthesis, materials science, and molecular recognition. Despite the wide use of term pi stacking in the scientific literature, there is no theoretical justification for its use.
  • 14.0K
  • 12 Oct 2022
Topic Review
Mercedes-Benz CLS-Class (W219)
The C219 Mercedes-Benz CLS-Class is the first generation of the CLS-Class range of four-door coupe features a fastback body style by Mercedes-Benz, and was produced between 2004 and 2010. The CLS-Class has only four seats and is marketed by Mercedes as a four-door coupé. For this reason, in Germany and in whole Europe the model code name is C219 while in US the CLS is more commonly named as W219 model. It was the first model globally to introduce this four-door coupe style and VW followed with the Volkswagen CC model in 2008. The car is less practical than the W211 E-Class that it is based on, with less legroom, headroom, and boot space. The CLS-Class is priced above the E-Class, but below the S-Class in the Mercedes model range. It was replaced by the Mercedes-Benz CLS-Class (W218) in 2011.
  • 13.9K
  • 04 Nov 2022
Topic Review
Chinese Swords
Historically, all Chinese swords are classified into two types, jian and dao. Jians are double-edged straight swords while daos are single-edged, and mostly curved from the Song dynasty forward. The jian has been translated at times as a long sword, and the dao a saber or a knife. Bronze jians appeared during the Western Zhou period and switched to wrought iron and steel during the late Warring States period. In modern times, the ceremonial commissioned officer's sword of the Chinese navy has been patterned after the traditional jian since 2008. Other than specialized weapons like the Divided Dao, Chinese swords are usually 70–110 cm (28–43 in) in length, although longer swords have been found on occasion. Outside of China, Chinese swords were also used in Japan from the third to the sixth century AD, but were replaced with Korean and native Japanese swords by the middle Heian era.
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  • 30 Sep 2022
Topic Review
Fish Muscle
Fish muscle, which accounts for 15%–25% of the total protein in fish, is a desirable protein source. Their hydrolysate is in high demand nutritionally as a functional food and thus has high potential added value. The hydrolysate contains physiologically active amino acids and various essential nutrients, the contents of which depend on the source of protein, protease, hydrolysis method, hydrolysis conditions, and degree of hydrolysis.
  • 13.9K
  • 07 Jul 2021
Topic Review
Ethereum
Ethereum is a decentralized, open-source blockchain with smart contract functionality. Ether (ETH or Ξ) is the native cryptocurrency of the platform. Among cryptocurrencies, Ether is second only to Bitcoin in market capitalization. Ethereum was conceived in 2013 by programmer Vitalik Buterin. Additional founders of Ethereum included Gavin Wood, Charles Hoskinson, Anthony Di Iorio and Joseph Lubin. In 2014, development work began and was crowdfunded, and the network went live on 30 July 2015. Ethereum allows anyone to deploy permanent and immutable decentralized applications onto it, with which users can interact. Decentralized finance (DeFi) applications provide a broad array of financial services without the need for typical financial intermediaries like brokerages, exchanges, or banks, such as allowing cryptocurrency users to borrow against their holdings or lend them out for interest. Ethereum also allows users to create and exchange NFTs, which are unique tokens representing ownership of an associated asset or privilege, as recognized by any number of institutions. Additionally, many other cryptocurrencies utilize the ERC-20 token standard on top of the Ethereum blockchain and have utilized the platform for initial coin offerings. A series of upgrades called Ethereum 2.0 includes a transition to proof of stake and aims to increase transaction throughput by using sharding.
  • 13.7K
  • 20 Oct 2022
Biography
Jaggi Vasudev
Jagadish "Jaggi" Vasudev[1] (born 3 September 1957), venerated as Sadhguru,[2][3] is an Indian yoga guru and author.[4][5][6][7] Jaggi Vasudev earned a Bachelor's degree in English from the University of Mysore and has been teaching yoga in southern India since 1982. In 1992 he established the Isha Foundation near Coimbatore, which operates an ashram and yoga centre and is involved in various a
  • 13.7K
  • 22 Nov 2022
Topic Review
Renewable Energy Supply Chain
The renewable energy supply chain (RESC) is defined as “the transformation of raw energy into usable energy and involves an effective set of management principles from the point of acquisition of energy resources to the point of consumption of usable energy”.
  • 13.7K
  • 16 Feb 2021
Topic Review
Electron Rest Mass
The electron rest mass (symbol: me) is the mass of a stationary electron, also known as the invariant mass of the electron. It is one of the fundamental constants of physics. It has a value of about 9.109×10−31 kilograms or about 5.486×10−4 daltons, equivalent to an energy of about 8.187×10−14 joules or about 0.5110 MeV.
  • 13.7K
  • 31 Oct 2022
Topic Review
Energy Management Strategy
A Comprehensive Review on Classification, Energy Management Strategy, and Control Algorithm for Hybrid Electric Vehicles
  • 13.7K
  • 22 Oct 2020
Topic Review
Sensible and Latent Heat Thermal Energy Storage
Sharing renewable energies, reducing energy consumption and optimizing energy management in an attempt to limit environmental problems (air pollution, global warming, acid rain, etc.) has today become a genuine concern of scientific engineering research. Furthermore, with the drastic growth of requirements in building and industrial worldwide sectors, the need for proper techniques that allow enhancement in the thermal performance of systems is increasingly being addressed. It is worth noting that using sensible and latent heat storage materials (SHSMs and phase change materials (PCMs)) for thermal energy storage mechanisms can meet requirements such as thermal comfort in buildings when selected correctly.
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  • 29 Jul 2022
Topic Review
Global South
The Global South is a term often used to identify lower-income countries on one side of the so-called global North–South divide, the other side being the countries of the Global North. As such the term does not inherently refer to a geographical south; for example, most of the Global South is actually within the Northern Hemisphere. The term, as used by governmental and development organizations, was first introduced as a more open and value free alternative to "Third World" and similar potentially "valuing" terms like developing countries. Countries of the Global South have been described as newly industrialized or in the process of industrializing and frequently have a history of colonialism by Northern, often European, states. The countries of Brazil, China, India, Indonesia, and Mexico have the largest populations and economies among Southern states. The overwhelming majority of these countries are located in or near the tropics.
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  • 14 Oct 2022
Topic Review
Tears in Rain Monologue
"Tears in rain" (also known as the "C-Beams Speech") is a monologue delivered by character Roy Batty (portrayed by Rutger Hauer) in the 1982 Ridley Scott film Blade Runner. Written by David Peoples and altered by Hauer from the scripted lines the night before filming, the monologue is frequently quoted; critic Mark Rowlands described it as "perhaps the most moving death soliloquy in cinematic history". The speech appears as the last track on the film's soundtrack album.
  • 13.6K
  • 03 Nov 2022
Topic Review
Power Electronic Switches
As the need for green and effective utilization of energy continues to grow, the advancements in the energy and power electronics industry are constantly driven by this need, as both industries are intertwined for obvious reasons. The developments in the power electronics industry has over the years hinged on the progress of the semiconductor device industry. The semiconductor device industry could be said to be on the edge of a turn into a new era, a paradigm shift from the conventional silicon devices to the wide band gap semiconductor technologies. While a lot of work is being done in research and manufacturing sectors, it is important to look back at the past, evaluate the current progress and look at the prospects of the future of this industry. This paper is unique at this time because it seeks to give a good summary of the past, the state-of-the-art, and highlight the opportunities for future improvements. A more or less ‘forgotten’ power electronic switch, the four-quadrant switch, is highlighted as an opportunity waiting to be exploited as this switch presents a potential for achieving an ideal switch.
  • 13.4K
  • 29 Dec 2020
Biography
Abd Al-Aziz Ibn Baz
Abd al-Aziz ibn Abdullah ibn Baz (Arabic: عبد العزيز بن عبد الله بن باز ʿAbd al-ʿAzīz ibn ʿAbdullāh ibn Baz) (21 November 1910 - 13 May 1999), also known as Sheikh Bin Baz, was a Saudi Arabian Islamic scholar. He was the Grand Mufti of Saudi Arabia from 1993 until his death in 1999. According to French political scientist Gilles Kepel, Baz was a "figurehead" whose "im
  • 13.4K
  • 29 Nov 2022
Topic Review
List of Oxidation States of the Elements
This is a list of known oxidation states of the chemical elements, excluding nonintegral values. The most common states appear in bold. The table is based on that of Greenwood and Earnshaw, with additions noted. Oxidation state 0, which occurs for all elements, is implied by the column with the symbol of the element. The format of the table, which was devised by Dmitri Mendeleev in 1889, shows the periodicity of the oxidation states of the elements.
  • 13.4K
  • 18 Oct 2022
Topic Review
Macroplastic
The term macroplastics describes plastic items with a diameter ≥ 5 mm. With this size definition macroplastics can be directly distinguished from microplastics (diameter < 5 mm). Plastic items ≥ 5 mm are commonly considered to be macroplastics once they are released into the environment. Other terminologies used synonymous to macroplastic are “macro litter", “anthropogenic litter”, “plastic litter”, “marine litter”, “marine plastic” and “plastic debris”. 
  • 13.3K
  • 09 Oct 2020
Topic Review
Catholic Church and Evolution
Early contributions to biology were made by Catholic scientists such as Jean-Baptiste Lamarck and the Augustinian monk Gregor Mendel. Since the publication of Charles Darwin's On the Origin of Species in 1859, the attitude of the Catholic Church on the theory of evolution has slowly been refined. For nearly a century, the papacy offered no authoritative pronouncement on Darwin's theories. In the 1950 encyclical Humani generis, Pope Pius XII confirmed that there is no intrinsic conflict between Christianity and the theory of evolution, provided that Christians believe that God created all things and that the individual soul is a direct creation by God and not the product of purely material forces. (As of 2013), the Church supports theistic evolution(ism), also known as evolutionary creation, although Catholics are free not to believe in any part of evolutionary theory. The Catholic Church holds no official position on the theory of creation or evolution, leaving the specifics of either theistic evolution or literal creationism to the individual within certain parameters established by the Church. According to the Catechism of the Catholic Church, any believer may accept either literal or special creation within the period of an actual six-day, twenty-four-hour period, or they may accept the belief that the earth evolved over time under the guidance of God. Catholicism holds that God initiated and continued the process of his evolutionary creation, that Adam and Eve were real people, and affirms that all humans, whether specially created or evolved, have and have always had specially created souls for each individual. Catholic schools in the United States and other countries teach evolution as part of their science curriculum. They teach the fact that evolution occurs and the modern evolutionary synthesis, which is the scientific theory that explains how evolution proceeds.
  • 13.3K
  • 31 Oct 2022
Topic Review
BMW 5 Series (E34)
The BMW E34 is the third generation of the BMW 5 Series, which was produced from 1987 until 1996. Initially launched as a sedan in January 1988, the E34 also saw a "Touring" wagon (estate) bodystyle in September 1992, a first for the 5 Series. BMW replaced the E34 with the E39 5 Series in December 1995, although E34 Touring models remained in production until June 1996. The E34 generation marked the first time all-wheel drive was incorporated into the 5 Series with the 525iX, and the first V8 engine to be used in a 5 Series. The E34 also saw the introduction of stability control (ASC), traction control (ASC+T) a 6-speed manual transmission and adjustable damping (EDC) to the 5 Series range. There was an unusually large range of engines fitted over its lifetime as nine different engine families were used. These consisted of straight-four, straight-six and V8 engines. The E34 M5 is powered by the S38 straight-six engine and was produced in sedan and wagon body styles.
  • 13.3K
  • 31 Oct 2022
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