All articles starting with B
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Boro people
The Boro people, also referred to as Bodo or Kachari, are an ethnic community of Northeast India and the Brahmaputra valley, speaking the Tibeto-Burman language.
Borobudur
Borobudur (Candi Borobudur) is an eighth- and ninth-century Buddhist stupa complex in Central Java, Indonesia, built by the Syailendra dynasty and listed as a World Heritage Site in 1991.
Borobudur Fossae
Borobudur Fossae is a 395-km-wide fossa (graben) system on Mercury, centered at -32.77°, 271.50°, IAU-approved in 2019 and named after the Borobudur temple in Central Java, Indonesia; it lies within the Rembrandt basin.
Borodino
Borodino (Бородино) is an 1837 narrative poem by Mikhail Lermontov, in which an old soldier recalls the 1812 Battle of Borodino; it made his literary fame.
Borodinsky Coal Mine
Borodinsky Coal Mine (Бородинский разрез) is the largest open-pit coal mine in Russia, working brown coal in the Kansk-Achinsk basin of Krasnoyarsk region since 1949.
Borodyans’kyy Rayon
Borodyans’kyy Rayon (Бородянський район), former raion of Kyiv Oblast, Ukraine, centered on Borodianka; existed 1923–1962, restored 1965, abolished 2020 and merged into Bucha Raion; 934 km², 57,365 people (2013).
Borohoro Mountains
Borohoro Mountains (Borohoro Shan, Borokhoro ula), a 250-km Tian Shan range in Xinjiang, China, up to 4,500 m, separating the Ili River basin from the Junggar Basin, with about 50 glaciers, Late Carboniferous Borohoro pluton bedrock, and a seismically active northern fold-and-thrust belt.
Borohydride
Borohydride is the tetrahydroborate anion, BH₄⁻, and the salts and metal complexes containing it; sodium borohydride, first prepared in 1943, is a widely used selective reducing agent.
Boromir
Boromir, son of Denethor II, is a Tolkien character: Gondorian captain, Fellowship of the Ring member, tempted by the One Ring, redeemed dying defending Merry and Pippin; played by Sean Bean in 2001.
Borommakot
Borommakot, also styled King Maha Thammarachathirat II, was king of Ayutthaya (Siam) from 1733 to 1758, remembered as a golden age of literature whose monks founded the Siam Nikaya in Sri Lanka.
Borommarachathirat I
Borommarachathirat I, also known as Khun Luang Pha Ngua, was the third king of Ayutthaya from 1370 to 1388 and founder of the Suphannaphum dynasty.
Borommarachathirat II
Borommarachathirat II, also known as Chao Sam Phraya, was the seventh king of Ayutthaya from 1424 to 1448, who took Angkor from the Khmer in 1431 and annexed the Sukhothai lands in 1438.
Borommatrailokkanat
Borommatrailokkanat, also known as King Trailok (1431–1488), was the eighth king of Ayutthaya who reigned 40 years and reorganized the Siamese state with his sakdina law.
Boron
Boron is the fifth element of the periodic table, a Group 13 metalloid isolated in 1808 that appears in borosilicate glass, detergents, reactor control rods, and experimental cancer therapy.
Boron arsenide
Boron arsenide (BAs) is a III-V compound semiconductor of boron and arsenic whose thermal conductivity, above 2100 W·m⁻¹·K⁻¹ in the purest crystals, is exceeded among bulk materials only by diamond and graphite.
Boron carbide
Boron carbide (B₄C) is an extremely hard ceramic compound of boron and carbon, second only to diamond and cubic boron nitride, used in lightweight body armor, abrasives, and nuclear reactor control rods.
Boron carbon nitride
Boron carbon nitride (BCN) is a ternary compound of boron, carbon, and nitrogen whose electronic properties can be tuned by composition, between conducting graphene and insulating boron nitride.
Boron clusters
Boron clusters are aggregates of a few to a few dozen boron atoms with planar, cage, and drum-like geometries, studied as borophene precursors and in cancer therapy.
Boron group
The boron group, also called group 13, is the periodic table family of boron, aluminum, gallium, indium, thallium, and nihonium, each with three valence electrons.
Boron injection
Boron injection is the deliberate addition of boric acid solution to a nuclear reactor's primary coolant circuit to add negative reactivity, for routine management or emergency shutdown.
Boron Neutron Capture Therapy
Boron neutron capture therapy (BNCT), also called neutron capture therapy, is a binary radiotherapy using boron-10 drugs plus neutron irradiation; the 10B(n,alpha)7Li reaction kills tumor cells, used for gliomas, melanoma, and recurrent head and neck cancer.
Boron nitride
Boron nitride (BN) is a chemical compound of boron and nitrogen in equal proportions, with crystalline forms structurally analogous to carbon: hexagonal BN resembles graphite and cubic BN resembles diamond.
Boron nitride nanotube
Boron nitride nanotubes (BNNTs) are nanotubes of alternating boron and nitrogen atoms, first synthesized in 1995. Unlike carbon nanotubes, they are insulating and tolerate higher temperatures.
Boron nitride-polymer thermally conductive composites
Boron nitride-polymer thermally conductive composites are polymers filled with boron nitride particles or nanosheets, conducting heat while staying electrically insulating for electronics packaging, batteries, and thermal interface materials.
Boron phosphide
Boron phosphide (BP) is a hard, chemically stable III-V semiconductor of boron and phosphorus with thermal conductivity near 500 W/m·K, studied for thermal management and electronics.
Boron radical anion activation
Boron radical anion activation is a set of photochemical and electrochemical strategies that turn organoboron compounds into boronate radical anions, releasing carbon or boron radicals for synthesis.
Boron radical chemistry
Boron radical chemistry is the branch of chemistry concerned with boron-centered radicals, unstable species whose Lewis base-ligated forms are now generated by photoredox and electrochemical methods.
Boron trichloride
Boron trichloride (BCl₃) is a colorless fuming gas, boiling at 12.5 °C, used as a Lewis acid reagent and as a dopant and etchant in semiconductor manufacturing.
Boron trifluoride
Boron trifluoride, also called trifluoroborane, is a colorless, nonflammable gas and strong Lewis acid used as an acid catalyst in organic synthesis and as a p-type dopant in semiconductor manufacturing.
Boron trifluoride etherate
Boron trifluoride etherate, also called boron trifluoride diethyl etherate, is the 1:1 adduct of boron trifluoride and diethyl ether, a fuming liquid used as a Lewis acid catalyst and convenient BF₃ source in organic synthesis.