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Topic Review
High Voltage Direct Current (HVDC) Technology
Two main high voltage direct current (HVDC) technologies: line-commutated converters (LCC), also known as current-source converters (CSC) using thyristors, and voltage-source converters (VSC)-HVDC, using IGBT transistors, both are suitable for a wide range of applications.
  • 16.6K
  • 07 Mar 2022
Topic Review
Shaft Mining
Shaft mining or shaft sinking is excavating a vertical or near-vertical tunnel from the top down, where there is initially no access to the bottom. Shallow shafts, typically sunk for civil engineering projects differ greatly in execution method from deep shafts, typically sunk for mining projects. When the top of the excavation is the ground surface, it is referred to as a shaft; when the top of the excavation is underground, it is called a winze or a sub-shaft. Small shafts may be excavated upwards from within an existing mine as long as there is access at the bottom, in which case they are called Raises. A shaft may be either vertical or inclined (between 45 and 90 degrees to the horizontal), although most modern mine shafts are vertical. If access exists at the bottom of the proposed shaft and ground conditions allow then raise boring may be used to excavate the shaft from the bottom up, such shafts are called borehole shafts. Shaft sinking is one of the most difficult of all development methods: restricted space, gravity, groundwater and specialized procedures make the task quite formidable. Historically mine shaft sinking has been among the most dangerous of all the mining occupations and the preserve of mining contractors called sinkers. Today shaft sinking contractors are concentrated in Canada , Germany and South Africa .
  • 16.6K
  • 17 Nov 2022
Topic Review
MP3 Player
An MP3 player is an electronic device that can play MP3 digital audio files. It is a type of digital audio player (DAP), or portable media player. Most players play more than the MP3 file format, such as Windows Media Audio (WMA), Advanced Audio Coding (AAC), Vorbis, FLAC, Speex and Ogg.
  • 16.5K
  • 19 Oct 2022
Topic Review
History of VFX
The History of Visual Effects (VFX) is intertwined with that of cinematography, special effects, animation and computer-generated imagery.
  • 16.5K
  • 10 Oct 2022
Topic Review
Hook-Up Culture
Hook-up culture refers to a culture built on the approved practice of engaging in hook-ups, or sexual encounters between two or more individuals where it is understood that commitment, relationships, and emotional feelings are not expected outcomes. Defining a hook-up is ambiguous because it can have a variety of meanings ranging from casual Kissing to foreplay and oral sex, or in some cases, it can mean participating in sexual intercourse. Hook-ups typically only last a short time and those involved are typically only interested in experiencing sexual intimacy and pleasure. Not all hook-ups can be classified as "one-night stands", however, since some people believe they can eventually lead to dating or more personal connections. While people have engaged in casual sex for many years, the act of "hooking-up" has become increasingly popular on college and university campuses in the United States over the last decade. Hooking up has become common for many college students, and the practice has replaced more traditional 20th century ideas about dating. Furthermore, social media sites like Facebook or Match, and phone applications like Grindr and Tinder have given users an opportunity to form connections with other people who have similar sexual interests or desires. Studying hook-up culture focuses on its influences on the formation and management of friendships and romantic relationships. The growth of hook-up culture is also shaping gender roles, specifically in regards to sexual behavior. Aside from these aspects of hook-ups, taking part in uncommitted sex can lead to potential negative physical and emotional impacts.
  • 16.5K
  • 02 Nov 2022
Topic Review
EEG Power Spectrum
The electrical activity of the brain reflected in the electroencephalogram (EEG) is determined by neurons, glia cells, and the blood-brain barrier, which is mainly caused by nerve cells.
  • 16.5K
  • 30 Oct 2020
Topic Review
Polarization (Politics)
Template:Globalize/US In politics, polarization (or polarisation) can refer to the divergence of political attitudes to ideological extremes. Almost all discussions of polarization in political science consider polarization in the context of political parties and democratic systems of government. When polarization occurs in a two-party system, like the United States , moderate voices often lose power and influence.
  • 16.4K
  • 25 Oct 2022
Topic Review
Higher Education and COVID-19
The COVID-19 pandemic had profound consequences on the educational dimension, with the temporary closure of educational institutions, as well as the impediment of face-to-face classes. These challenging conditions can be a critical moment of opportunity to reshape education in higher education, with the implementation, development, and diffusion of digital technologies.
  • 16.4K
  • 20 Oct 2020
Topic Review
Pixar Universe Theory
The Pixar universe theory, or simply Pixar theory, proposes the existence of a "shared universe" in which every film that is created by Pixar takes place, sharing characteristics and an internal logic. Media discussion about a "Pixar Universe" has existed since at least 2003, and has been referred to in disparate sources such as SlashFilm, Washington Times, Reno Gazette-Journal, and MTV News. In To Infinity and Beyond!: The Story of Pixar Animation Studios, the companion book to documentary The Pixar Story, Karen Paik states that there are many internal references between various films in The Pixar Universe. In 2009, CityNews Toronto made comparisons between nine "Pixar Universe" films. In his 2013 thesis entitled "The Pixar Theory", Jon Negroni wrote that all fourteen Pixar movies released at the time took place in a single fictional universe. He acknowledges that the concepts behind his thesis were derived from an episode of the Cracked.com video series After Hours, written by Daniel O'Brien. In his post, Negroni discusses all of the films and how they relate in a timeline of events. The character of Boo in Monsters, Inc. is said to create a time loop, and consequently is the same character as the Witch in Brave. As Pixar released new movies, Negroni wrote new posts to fit each new plotline in the whole theory: in June 2015, he published an article on moviepilot.com and another one on his website explaining how Inside Out also fits into his theory; on December 3, 2015, he wrote another post expanding his theory to The Good Dinosaur and on June 17, 2016 another article explaining how the timeline encompasses Finding Dory as well. Negroni had also fit the Cars spin-off series, Planes, into the theory, even though it was not made by Pixar. The blog io9 described Negroni's work as "a crazy read, one that Negroni has been annotating as readers point to corrections or flaws in his theory. But even as a tinfoil hat theory, it makes some clever connections—and, of course, contains plenty of Pizza Planet trucks." Speaking in an informal 2013 interview, Cars "franchise guardian" Jay Ward rejected the idea that the films take place in the same universe, saying: "It's almost like the 9/11 conspiracy theories... it's like, really? No, the movies were sort of made in a different order by different directors in different times, in different places. It's cool that it all worked out that way, but it probably was not intentional." At the 2015 D23 Expo, during the "Pixar Secrets Revealed" panel, director Mark Andrews also rejected the theory, and Inside Out co-director Ronnie del Carmen said: "Do you know what kinds of meetings we'd have to have to make sure all our movies line up?!"
  • 16.4K
  • 17 Oct 2022
Topic Review
Principalía
The Principalía or noble class was the ruling and usually educated upper class in the pueblos of the Spanish Philippines, comprising the gobernadorcillo (who had functions similar to a town mayor), and the cabezas de barangay (heads of the barangays) who governed the districts. The distinction or status of being part of the principalía was a hereditary right. However, it could also be acquired, as attested by the royal decree of 20 December 1863 (signed in the name of Queen Isabella II by the Minister of the Colonies, José de la Concha). p1 cols 1–4 This distinguished upper class was exempted from tribute (tax) to the Spanish crown during the colonial period. Colonial documents would refer to them as "de privilegio y gratis", in contrast to those who pay tribute ("de pago"). It was the true aristocracy and the true nobility of colonial Philippines, which could be roughly comparable to the patrician class of ancient Rome. The principales (members of the principalía) traced their origin from the pre‑colonial royal and noble class of Datu of the established kingdoms, rajahnates, confederacies, and principalities,(p19) as well as the lordships of the smaller ancient social units called barangays in Visayas, Luzon, and Mindanao. The members of this class enjoyed exclusive privileges: only the members of the principalía were allowed to vote, be elected to public office, and be addressed by the title: Don or Doña.(p624)(p218) The use of the honorific addresses "Don" and "Doña" was strictly limited to what many documents during the colonial period would refer to as "vecinas y vecinos distinguidos". For the most part, the social privileges of the nobles were freely acknowledged as befitting their greater social responsibilities. The gobernadorcillo during that period received a nominal salary and was not provided government funds for public services. In fact more often the gobernadorcillo had to maintain government of his municipality by looking after the post office and the jailhouse, and by managing public infrastructure, using personal resources.(p326)(p294) Principales also provided assistance to parishes by helping in the construction of church buildings, and in the pastoral and religious activities of the priests who, being usually among the few Spaniards in most colonial towns, had success in winning the goodwill of the natives. More often, the clergy were the sole representatives of Spain in many parts of the archipelago. Under the Patronato Real of the Spanish crown, these Spanish churchmen were also the king's effective ambassadors, and promoters of the realm.(p726-727;735) With the end of Spanish sovereignty over the Philippines after the Spanish–American War in 1898 and the introduction of a democratic, republican system during the American Occupation, the Principalía and their descendants lost their legal authority and social privileges. Many were, however, able to integrate into the new socio-political structure, retaining some degree of influence and power.
  • 16.3K
  • 28 Sep 2022
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