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Analog Synthesizer
An analog (or analogue) synthesizer is a synthesizer that uses analog circuits and analog signals to generate sound electronically. The earliest analog synthesizers in the 1920s and 1930s, such as the Trautonium, were built with a variety of vacuum-tube (thermionic valve) and electro-mechanical technologies. After the 1960s, analog synthesizers were built using operational amplifier (op-amp) integrated circuits, and used potentiometers (pots, or variable resistors) to adjust the sound parameters. Analog synthesizers also use low-pass filters and high-pass filters to modify the sound. While 1960s-era analog synthesizers such as the Moog used a number of independent electronic modules connected by patch cables, later analog synthesizers such as the Minimoog integrated them into single units, eliminating patch cords in favour of integrated signal routing systems.
  • 554
  • 09 Oct 2022
Topic Review
Analysis of Ancient Bones
The analysis of bone microstructure and histological examination currently provides valuable insights into various facets of bone biology, ancient human existence, and bone-related diseases.
  • 298
  • 31 Jul 2023
Topic Review
Anatta
In Buddhism, the term anattā (Pali) or anātman (Sanskrit) refers to the doctrine of "non-self", that there is no unchanging, permanent self, soul or essence in phenomena. It is one of the seven beneficial perceptions in Buddhism, and one of the three marks of existence along with dukkha (suffering) and anicca (impermanence). The Buddhist concept of anatta or anatman is one of the fundamental differences between Buddhism and Hinduism, with the latter asserting that atman (self, soul) exists.
  • 5.4K
  • 15 Nov 2022
Topic Review
Anaxagoras
Anaxagoras (/ˌænækˈsæɡərəs/; Greek: Ἀναξαγόρας, Anaxagoras, "lord of the assembly"; c. 500 – c. 428 BC) was a Pre-Socratic Greek philosopher. Born in Clazomenae at a time when Asia Minor was under the control of the Persian Empire, Anaxagoras came to Athens. According to Diogenes Laërtius and Plutarch, in later life he was charged with impiety and went into exile in Lampsacus; the charges may have been political, owing to his association with Pericles, if they were not fabricated by later ancient biographers. Responding to the claims of Parmenides on the impossibility of change, Anaxagoras described the world as a mixture of primary imperishable ingredients, where material variation was never caused by an absolute presence of a particular ingredient, but rather by its relative preponderance over the other ingredients; in his words, "each one is... most manifestly those things of which there are the most in it". He introduced the concept of Nous (Cosmic Mind) as an ordering force, which moved and separated out the original mixture, which was homogeneous, or nearly so. He also gave a number of novel scientific accounts of natural phenomena. He deduced a correct explanation for eclipses and described the Sun as a fiery mass larger than the Peloponnese, as well as attempting to explain rainbows and meteors.
  • 819
  • 24 Oct 2022
Topic Review
Anchorite
An anchorite or anchoret (female: anchoress; adj. anchoritic; from Ancient Greek:, anachōrētḗs, "one who has retired from the world", from the verb ἀναχωρέω, anachōréō, signifying "to withdraw", "to retire") is someone who, for religious reasons, withdraws from secular society so as to be able to lead an intensely prayer-oriented, ascetic, or Eucharist-focused life. Whilst anchorites are frequently considered to be a type of religious hermit, unlike hermits they were required to take a vow of stability of place, opting instead for permanent enclosure in cells often attached to churches. Also unlike hermits, anchorites were subject to a religious rite of consecration that closely resembled the funeral rite, following which they would be considered dead to the world, a type of living saint. Anchorites had a certain autonomy, as they did not answer to any ecclesiastical authority other than the bishop. The anchoritic life is one of the earliest forms of Christian monasticism. In the Catholic Church today, it is one of the "Other Forms of Consecrated Life" and governed by the same norms as the consecrated eremitic life. From the 12th to the 16th centuries, female anchorites consistently outnumbered their male equivalents, sometimes by as many as four to one (in the 13th century), dropping eventually to two to one (in the 15th century). The sex of a high number of anchorites, however, is not recorded for these periods.
  • 842
  • 13 Nov 2022
Topic Review
Ancient Egyptian Medicine
The medicine of the ancient Egyptians is some of the oldest documented. From the beginnings of the civilization in the late fourth millennium BC until the Persian invasion of 525 BC, Egyptian medical practice went largely unchanged and included simple non-invasive surgery, setting of bones, dentistry, and an extensive set of pharmacopoeia. Egyptian medical thought influenced later traditions, including the Greeks.
  • 2.0K
  • 20 Oct 2022
Topic Review
Ancient Mithila University
Ancient Mithila University was an ancient university and was famous for Nyaya Shastra and logical sciences.
  • 3.4K
  • 18 Oct 2022
Topic Review
Ancient Urban Land-Use Based on Geographic Information System
As ancient cities are spaces that represent the development of civilization, it is worth exploring and studying their characteristics and conceptions of land use. The city plan was calibrated with the help of satellite remote sensing images and sites. By constructing the “urban element area acquisition and analysis model”, various operations for areas in the city plan were realized, including an area value calculation, land use structure calculation, area modulus analysis, area ratio analysis between areas, and determination of the cultural significance of numbers and ratios. Taking the Sui and Tang dynasties capital city of Chang'an as an example, it will be described in detail below.
  • 514
  • 15 Jun 2023
Topic Review
Andalusian Arabic
Andalusian Arabic, also known as Andalusi Arabic, was a variety or varieties of Arabic spoken in Al-Andalus, the regions of the Iberian Peninsula (modern Spain and Portugal) under Muslim rule (and for some time after) from the 9th century to the 17th century. It became an extinct language in Iberia after the expulsion of the former Hispanic Muslims, which took place over a century after the Granada War by the Catholic Monarchs of Spain. Once widely spoken in Iberia, the expulsions and persecutions of Arabic speakers caused an abrupt end to the language's use on the peninsula. Its use continued to some degree in North Africa after the expulsion, although Andalusi speakers were rapidly assimilated by the Maghrebi communities to which they fled.
  • 1.5K
  • 10 Oct 2022
Topic Review
Angakkuq
The Inuit angakkuq (plural: angakkuit, Inuktitut syllabics ᐊᖓᑦᑯᖅ or ᐊᖓᒃᑯᖅ) Inuvialuktun: angatkuq; Greenlandic: angakkoq, pl. angákut) is an intellectual and spiritual figure in Inuit culture who corresponds to a medicine man. Other cultures, including Alaska Natives, have traditionally had similar spiritual mediators, although the Alaska Native religion has many forms and variants.
  • 659
  • 29 Sep 2022
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