You're using an outdated browser. Please upgrade to a modern browser for the best experience.
Subject:
All Disciplines Arts & Humanities Biology & Life Sciences Business & Economics Chemistry & Materials Science Computer Science & Mathematics Engineering Environmental & Earth Sciences Medicine & Pharmacology Physical Sciences Public Health & Healthcare Social Sciences
Sort by:
Most Viewed Latest Alphabetical (A-Z) Alphabetical (Z-A)
Filter:
All Topic Review Biography Peer Reviewed Entry Video Entry
Topic Review
Children's Television Series
Children's television series are television programs designed for children, normally scheduled for broadcast during the morning and afternoon when children are awake. They can sometimes run during the early evening, allowing younger children to watch them after school. The purpose of these shows is mainly to entertain or educate.
  • 13.5K
  • 28 Nov 2022
Topic Review
Importance, Properties and Benefits of Biochar
Biochar can be defined as the carbonaceous product that is obtained when biomass is subjected to heat treatment in an oxygen-limited environment (pyrolysis) and the charred product when applied to soil as an amendment. It is an important and popular carbon sequestration method to mitigate climate change.
  • 13.5K
  • 15 Jun 2022
Topic Review
Large Intestine
The large intestine consists of ascending, transverse, descending, sigmoidal colon and the rectum. The wall of the large intestine can be divided into four anatomically distinct layers (from inner to outer): mucosa, submucosa, muscularis propria (inner circular and outer longitudinal layers), and serosa. Its major physiological functions include absorbing water, moving waste residue down the GI tract, and temporary fecal storage, all of which involve mechanical movement and deformation of the tubular gastrointestinal structure. The biomechanics of the large intestinal tissue plays a key role in those aforementioned physiological functions in both health and disease.  In addition, chronic visceral pain from the colon and rectum has a prominent mechanical component – it is mechanical distension, not heating, pinching, cutting, or inflammation that reliably evokes pain from hollow visceral organs. The structure and function of the large intestine is systematically summarized below with a particular focus on the heterogeneous biomechanical properties at different sub-layers of the intestinal wall.
  • 13.5K
  • 09 Nov 2020
Topic Review
Information Seeking Behavior
Information seeking behavior refers to the way people search for and utilize information. The term was coined by Thomas D. Wilson in his 1981 paper, on the grounds that the current 'information needs' was unhelpful as a basis for a research agenda, since 'need' could not be directly observed, while how people behaved in seeking information could be observed and investigated. However, there is increasing work in the information searching field that is relating behaviors to underlying needs. In 2000, Wilson described information behavior as the totality of human behavior in relation to sources and channels of information, including both active and passive information-seeking, and information use. He described information seeking behavior as purposive seeking of information as a consequence of a need to satisfy some goal. Information seeking behavior is the micro-level of behavior employed by the searcher in interacting with information systems of all kinds, be it between the seeker and the system, or the pure method of creating and following up on a search. A variety of theories of information behavior – e.g. Zipf's principle of least effort, Brenda Dervin's sensemaking, Elfreda Chatman's life in the round – seek to understand the processes that surround information seeking. The analysis of the most cited publications on information behavior during the first years of this century shows its theoretical nature. Together with some works that have a constructivist focus, using references to Dewey, Kelly, Bruner and Vygotsky, others mention sociological concepts, such as Bourdieu's habitus. Several adopt a constructionist-discursive focus, whereas some, such as Chatman, who can in general be described as using an ethnographic perspective, stand out for the quantity and diversity of references to social research. The term 'information behaviour' was also coined by Wilson and occasioned some controversy on its introduction, but now seems to have been adopted, not only by researchers in information science but also in other disciplines. The digital world is changing human information behavior and process. Focused almost exclusively on information seeking and using, information receiving, a central modality of the process is generally overlooked. As information seeking continues to migrate to the Internet, and artificial intelligence continues to advance the analysis of user behavior on the Internet across a range of user interactions, information receiving moves to the heart of the process, as systems "learn" what users like, want and need, as well as their search habits.
  • 13.5K
  • 09 Oct 2022
Topic Review
Astana
Astana, previously known as Akmolinsk, Tselinograd, Akmola and most recently Nur-Sultan, is the capital city of Kazakhstan. The city lies on the banks of the Ishim River in the north-central part of Kazakhstan, within the Akmola Region, though administered as a city with special status separately from the rest of the region. A 2020 official estimate reported a population of 1,136,008 within the city limits, making it the second-largest city in the country, after Almaty, which had been the capital until 1997. The city became the capital of Kazakhstan in 1997; since then it has grown and developed economically into one of the most modern cities in Central Asia. In 2021, the government selected Astana as one of the 10 priority destinations for tourist development. Modern Astana is a planned city, following the process of other planned capitals. After it became the capital of Kazakhstan, the city dramatically changed its shape. The city's master-plan was designed by Japanese architect Kisho Kurokawa. As the seat of the government of Kazakhstan, Astana is the site of the Parliament House, the Supreme Court, the Ak Orda Presidential Palace and numerous government departments and agencies. It is home to a range of futuristic buildings, including many skyscrapers.
  • 13.4K
  • 03 Mar 2023
Topic Review
Armor-Piercing Shell
An armor-piercing shell, armour-piercing shell in Commonwealth English, AP for short, is a type of ammunition designed to penetrate armor. From the 1860s to 1950s, a major application of armor-piercing projectiles was to defeat the thick armor carried on many warships and cause damage to the lightly-armored interior. From the 1920s onwards, armor-piercing weapons were required for anti-tank missions. AP rounds smaller than 20 mm are typically known as "armor-piercing ammunition", and are intended for lightly-armored targets such as body armor, bulletproof glass and light armored vehicles. The AP shell is now seldom used in naval warfare, as modern warships have little or no armor protection. In the anti-tank role, as tank armor improved during World War II newer designs began to use a smaller but dense penetrating body within a larger shell. These lightweight shells were fired at very high muzzle velocity and retained that speed and the associated penetrating power over longer distances. An armor-piercing shell must withstand the shock of punching through armor plating. Shells designed for this purpose have a greatly strengthened body with a specially hardened and shaped nose. One common addition to later shells is the use of a softer ring or cap of metal on the nose known as a penetrating cap. This lowers the initial shock of impact to prevent the rigid shell from shattering, as well as aiding the contact between the target armor and the nose of the penetrator to prevent the shell from bouncing off in glancing shots. Ideally, these caps have a blunt profile, which led to the use of a further thin aerodynamic cap to improve long-range ballistics. AP shells may contain a small explosive charge known as a "bursting charge". Some smaller-caliber AP shells have an inert filling or an incendiary charge in place of the bursting charge. Designs using newer technologies no longer look like the classic artillery shell and have displaced it. Instead the penetrator is a long rod of dense material like tungsten or depleted uranium (DU) that further improves the terminal ballistics. Whether these modern designs are considered to be AP rounds depends on the definition. Accordingly reference sources vary in whether they include or exclude them.
  • 13.4K
  • 02 Nov 2022
Topic Review
Indigenous Aryans
Indigenous Aryans, also known as the Out of India theory (OIT), is the idea that the Aryans are indigenous to the Indian subcontinent, and that the Indo-European languages radiated out from a homeland in India into their present locations. Reflecting traditional Indian views based on the Puranic chronology, the indigenist view proposes an older date than is generally accepted for the Vedic period, and argues that the Indus Valley Civilization was a Vedic civilization. In this view, "the Indian civilization must be viewed as an unbroken tradition that goes back to the earliest period of the Sindhu-Sarasvati (or Indus) tradition (7000 or 8000 BCE)." It is presented as an alternative to the established migration model, which proposes the Pontic steppe as the area of origin of the Indo-European languages. The proposal is based on traditional and religious views on Indian history and identity, and plays a signifcant role in Hindutva politics. Support for this idea mostly exists among Indian scholars of Hindu religion and the history and archaeology of India, and has no support in mainstream scholarship.
  • 13.4K
  • 13 Oct 2022
Biography
Yuval Noah Harari
Yuval Noah Harari (Hebrew: יובל נח הררי‎, [juˈval ˈnoaχ (h)aˈʁaʁi]; born 24 February 1976) is an Israeli historian and a professor in the Department of History at the Hebrew University of Jerusalem.[1] He is the author of the popular science bestsellers Sapiens: A Brief History of Humankind (2014), Homo Deus: A Brief History of Tomorrow (2016), and 21 Lessons for the 21st Centu
  • 13.4K
  • 10 Nov 2022
Topic Review
Allegory of the Cave
The Allegory of the Cave, or Plato's Cave, was presented by the Ancient Greece philosopher Plato in his work Republic (514a–520a) to compare "the effect of education (παιδεία) and the lack of it on our nature". It is written as a dialogue between Plato's brother Glaucon and his mentor Socrates, narrated by the latter. The allegory is presented after the analogy of the sun (508b–509c) and the analogy of the divided line (509d–511e). All three are characterized in relation to dialectic at the end of Books VII and VIII (531d–534e). Plato has Socrates describe a group of people who have lived chained to the wall of a cave all of their lives, facing a blank wall. The people watch shadows projected on the wall from objects passing in front of a fire behind them, and give names to these shadows. The shadows are the prisoners' reality. Socrates explains how the philosopher is like a prisoner who is freed from the cave and comes to understand that the shadows on the wall are not reality at all, for he can perceive the true form of reality rather than the manufactured reality that is the shadows seen by the prisoners. The inmates of this place do not even desire to leave their prison, for they know no better life. The prisoners manage to break their bonds one day, and discover that their reality was not what they thought it was. They discovered the sun, which Plato uses as an analogy for the fire that man cannot see behind. Like the fire that cast light on the walls of the cave, the human condition is forever bound to the impressions that are received through the senses. Even if these interpretations (or, in Kantian terminology, intuitions) are an absurd misrepresentation of reality, we cannot somehow break free from the bonds of our human condition—we cannot free ourselves from phenomenal state just as the prisoners could not free themselves from their chains. If, however, we were to miraculously escape our bondage, we would find a world that we could not understand—the sun is incomprehensible for someone who has never seen it. In other words, we would encounter another "realm", a place incomprehensible because, theoretically, it is the source of a higher reality than the one we have always known; it is the realm of pure Form, pure fact. Socrates remarks that this allegory can be paired with previous writings, namely the analogy of the sun and the analogy of the divided line.
  • 13.4K
  • 15 Nov 2022
Topic Review
Mail-Order Bride
A mail-order bride is a woman who lists herself in catalogs and is selected by a man for marriage. In the twentieth century, the trend was primarily towards women living in developing countries seeking men in more developed nations. In the twenty-first century, the trend is now based primarily on internet-based meeting places which do not per se qualify as mail-order bride services. The majority of the women listed in the twentieth-century and twenty-first-century services are from Southeast Asia, countries of the former Eastern Bloc and (to a lesser extent) from Latin America. Since the collapse of the Soviet Union, large numbers of eastern European women have advertised themselves in such a way, primarily from Russia , Belarus , Ukraine , and Moldova. Men who list themselves in such publications are referred to as "mail-order husbands", although this is much less common. The term "mail-order bride" is both criticized by owners (and customers) of international marriage agencies and used by them as an easily recognizable term.
  • 13.4K
  • 25 Nov 2022
Topic Review
Tracking Technology in Augmented Reality
Augmented reality (AR) is one of the leading expanding immersive experiences of the 21st century. AR has brought a revolution in different realms including health and medicine, teaching and learning, tourism, designing, manufacturing, and other similar industries whose acceptance accelerated the growth of AR in an unprecedented manner. The tracking technologies are the building blocks of AR and establish a point of reference for movement and for creating an environment where the virtual and real objects are presented together. To achieve a real experience with augmented objects, several tracking technologies are presented.
  • 13.4K
  • 03 Jan 2023
Topic Review
Data Envelopment Analysis (DEA)
Data Envelopment Analysis (DEA) is a non-parametric methodology for measuring the efficiency of Decision Making Units (DMUs) using multiple inputs to outputs configurations. This is the most commonly used tool for frontier estimations in assessments of productivity and efficiency applied to all fields of economic activities.
  • 13.4K
  • 28 Jan 2022
Topic Review
God in Catholicism
God in Catholicism is the God of Abraham, Isaac, and Jacob. The Catholic Church believes that there is one true and living God, the Creator and Lord of Heaven and Earth. Despite other opinions, God is All-Perfect; this infinite Perfection is viewed, successively, under various aspects, each of which is treated as a separate perfection and characteristic inherent to the Divine Substance, or Essence. A certain group of these, of paramount import, is called the Divine Attributes. The position of the Catholic Church declared in the Fourth Lateran Council (1215), is again stated in the following pronouncement of the Vatican Council: "The Holy, Catholic, Apostolic, Roman Church believes and confesses that there is one, true, living God, Creator and Lord of heaven and earth, omnipotent, eternal, immense, incomprehensible, infinite in intellect and will, and in every perfection; who, although He is one, singular, altogether simple and unchangeable spiritual substance, must be proclaimed distinct in reality and essence from the world; most blessed in Himself and of Himself, and ineffably most high above all things which are or can be conceived outside Himself."
  • 13.4K
  • 09 Oct 2022
Topic Review
List of Facebook Features
Facebook is a social-network service website launched on February 4, 2004 by Mark Zuckerberg. The following is a list of software and technology features that can be found on the Facebook website and mobile app and are available to users of the social media site.
  • 13.4K
  • 29 Nov 2022
Topic Review
Gravity Well
A gravity well or gravitational well is a conceptual model of the gravitational field surrounding a body in space – the more massive the body, the deeper and more extensive the gravity well associated with it. The Sun is very massive, relative to other bodies in the Solar System, so the corresponding gravity well that surrounds it appears "deep" and far-reaching. The gravity wells of asteroids and small moons, conversely, are often depicted as very shallow. Anything at the center of mass of a planet or moon is considered to be at the bottom of that celestial body's gravity well, and so escaping the effects of gravity from such a planet or moon (to enter outer space) can be likened to "climbing out of the gravity well". The deeper a gravity well is, the more energy any space-bound "climber" must use to escape it. In astrophysics, a gravity well is specifically the gravitational potential field around a massive body. Other types of potential wells include electrical and magnetic potential wells. Physical models of gravity wells are sometimes used to illustrate orbital mechanics. Gravity wells are frequently confused with embedding diagrams used in general relativity theory, but the two concepts are distinctly separate and not directly related.
  • 13.3K
  • 12 Oct 2022
Topic Review
The Tryptophan-Kynurenine Metabolic Pathway
Tryptophan (TRP) is one of the essential amino acids, which participates in protein synthesis. The tryptophan’s main metabolic route is the kynurenine pathway (KP) through which approximately 90-95% of TRP degrades into nicotinamide adenine dinucleotide (NAD+) and other bioactive metabolites. The appropriate amount of NAD+ is essential to maintain the operation and the viability of cells. The other molecules are neurotoxic, neuroprotective, oxidant, antioxidant, and/or immune modifiers. They play an important role in the function of the brain and the peripheral tissues. The change in the levels of the bioactive molecules is considered to contribute to the development of a wide range of illnesses from cancer to immunologic, neurodegenerative, and psychiatric diseases.
  • 13.3K
  • 10 Aug 2021
Topic Review
Puruṣārtha
Puruṣārtha (Sanskrit: पुरुषार्थ) literally means an "object of human pursuit". It is a key concept in Hinduism, and refers to the four proper goals or aims of a human life. The four puruṣārthas are Dharma (righteousness, moral values), Artha (prosperity, economic values), Kama (pleasure, love, psychological values) and Moksha (liberation, spiritual values). All four Purusarthas are important, but in cases of conflict, Dharma is considered more important than Artha or Kama in Hindu philosophy. Moksha is considered the ultimate ideal of human life. At the same time, this is not a consensus among all Hindus, and many have different interpretations of the hierarchy, and even as to whether one should exist. Historical Indian scholars recognized and debated the inherent tension between active pursuit of wealth (Artha purusartha) and pleasure (Kama), and renunciation of all wealth and pleasure for the sake of spiritual liberation (Moksha). They proposed "action with renunciation" or "craving-free, dharma-driven action", also called Nishkam Karma as a possible solution to the tension.
  • 13.3K
  • 14 Oct 2022
Topic Review
Ethnomathematics in Mathematics Education
Ethnomathematics is broadly defined as the study of the relationship between culture and mathematics. It is used to describe the ways in which mathematics is practiced among similar and dissimilar cultural groups.
  • 13.3K
  • 31 May 2022
Topic Review
Tesla Roadster (2008)
The Tesla Roadster is a battery electric vehicle (BEV) sports car, based on the Lotus Elise chassis, that was produced by the electric car firm Tesla Motors (now Tesla, Inc.) in California from 2008 to 2012. The Roadster was the first highway legal serial production all-electric car to use lithium-ion battery cells and the first production all-electric car to travel more than 320 kilometres (200 mi) per charge. It is also the first production car to be launched into orbit, carried by a Falcon Heavy rocket in a test flight on February 6, 2018. Tesla sold about 2,450 Roadsters in over 30 countries, and most of the last Roadsters were sold in Europe and Asia during the fourth quarter of 2012. Tesla produced right-hand-drive Roadsters from early 2010. The Roadster qualified for government incentives in several nations. According to the U.S. EPA, the Roadster can travel 393 kilometres (244 mi) on a single charge of its lithium-ion battery pack, and can accelerate from 0 to 97 km/h (0 to 60 mph) in 3.7 or 3.9 seconds depending on the model. It has a top speed of 201 km/h (125 mph). The Roadster's efficiency, (As of September 2008), was reported as 120 MPGe (2.0 L/100 km). It uses 135 Wh/km (21.7 kW·h/100 mi, 13.5 kW·h/100 km or 490 kJ/km) battery-to-wheel, and has an efficiency of 88% on average.
  • 13.3K
  • 11 Nov 2022
Topic Review
Doubling Time
The doubling time is time it takes for a population to double in size/value. It is applied to population growth, inflation, resource extraction, consumption of goods, compound interest, the volume of malignant tumours, and many other things that tend to grow over time. When the relative growth rate (not the absolute growth rate) is constant, the quantity undergoes exponential growth and has a constant doubling time or period, which can be calculated directly from the growth rate. This time can be calculated by dividing the natural logarithm of 2 by the exponent of growth, or approximated by dividing 70 by the percentage growth rate (more roughly but roundly, dividing 72; see the rule of 72 for details and derivatiatives of this formula). The doubling time is a characteristic unit (a natural unit of scale) for the exponential growth equation, and its converse for exponential decay is the half-life. For example, given Canada's net population growth of 0.9% in the year 2006, dividing 70 by 0.9 gives an approximate doubling time of 78 years. Thus if the growth rate remains constant, Canada's population would double from its 2006 figure of 33 million to 66 million by 2084.
  • 13.3K
  • 28 Nov 2022
  • Page
  • of
  • 2784
Featured Entry Collections
>>

Featured Books

>>
Encyclopedia of COVID-19
Encyclopedia of Engineering
Encyclopedia of Social Sciences
Encyclopedia of Digital Society, Industry 5.0 and Smart City
Academic Video Service
Feedback