All articles starting with H
20,046 articles
Hiei (飛影) (YuYu Hakusho)
Hiei (飛影), also Jaganshi Hiei, is a fire demon and Jagan (evil eye) wielder in Yoshihiro Togashi's YuYu Hakusho; a thief enemy turned ally of Yusuke, first in both Jump popularity polls, voiced by Nobuyuki Hiyama and Chuck Huber.
Hiei Chu Patera
Hiei Chu Patera is a 139 km patera (scalloped volcanic crater) on Venus at 48.20°N, 97.40°E, IAU-approved in 1985 and named for the Chinese figure credited with converting silkworm product into thread (2698 B.C.).
Hiempsal I
Hiempsal I was a king of Numidia in North Africa who shared the throne with his brother Adherbal and cousin Jugurtha from 118 BC until Jugurtha murdered him in 117 BC.
Hiempsal II
Hiempsal II was a king of Numidia in North Africa from about 88 to 62 BC, the son of King Gauda and father of Juba I.
Hienuki Gun
Hienuki Gun (稗貫郡, Hienuki District) was a district of Iwate Prefecture, Japan, first recorded in 811 in the Nihon Kōki and dissolved January 1, 2006 when Ōhasama and Ishidoriya merged into Hanamaki City.
Hiera (Turkey)
Hiera Germe (Greek: Ἱερά Γέρμη), also called Germa in Hellesponto, was a town of ancient Mysia in Asia Minor, known for a sacred spring and its Roman coinage.
Hiera Oikia at Eleusis
Hiera Oikia (Sacred House) at Eleusis: a Late Geometric, end-8th-century-BC cult building in the sanctuary of Demeter and Kore, interpreted as a hero-ancestor shrine, later replaced by a square hall and a Peisistratean poros temple, distinct from the Dodona Hiera Oikia.
Hieraaetus
Hieraaetus (Kaup, 1844) is a genus of small booted eagles in Accipitridae, including the Booted, Little, Pygmy, Ayres's, and Wahlberg's Eagles plus the extinct Hieraaetus moorei; its split from Aquila remains debated among authorities.
Hieraaetus morphnoides
Hieraaetus morphnoides, the Little Eagle (Aquila morphnoides), is a small 45-55 cm Australian booted eagle with pale and dark morphs, rabbit-heavy diet, Vulnerable in ACT, NSW, SA, and Victoria.
Hieraaetus pennatus
Hieraaetus pennatus, the booted eagle (Aquila pennata), a small trans-Saharan migratory eagle breeding in southern Europe and wintering mainly in the Sahel; IUCN Least Concern, Spain holds about 70% of the European population.
Hieracium
Hieracium (hawkweeds) is a large Asteraceae genus of perennial herbs with yellow flowerheads, 4,614 accepted species, apomictic polyploids, and a split-off relative genus Pilosella; Mendel's later experimental plant.
Hieracon
Hieracon, also recorded as Hierakon and Theracon, was a fortified Roman town in Upper Egypt on the right bank of the Nile, now identified with Deir el-Gabrawi.
Hierakonpolis
Hierakonpolis, the Greek name of ancient Nekhen meaning 'Town of the Falcon', is an ancient Egyptian site on the Nile's west bank near Luxor and the largest Predynastic settlement.
Hierapolis (Ἱεράπολις)
Hierapolis (Ἱεράπολις), the Holy City at Pamukkale, Turkey: a Hellenistic-Roman thermal spa founded by the Attalids in the late 2nd century BC, rebuilt after the 60 AD earthquake, an early Christian bishopric of St. Philip, abandoned by 1190.
Hierapolis-Pamukkale
Hierapolis-Pamukkale, Turkey: white travertine terraces of Pamukkale (cotton castle) below the Greco-Roman spa city of Hierapolis, founded by the Attalids, UNESCO-listed 1988, criteria iii, iv, vii.
Hierapolis/Kastabala
Hierapolis/Kastabala, ancient city in Cilicia (Osmaniye, Turkey), cult center of Artemis Perasia, renamed Hierapolis by Antiochus IV; distinct from the Denizli Hierapolis.
Hierarchical and recursive queries in SQL
Hierarchical and recursive queries in SQL are queries that traverse tree or graph data in relational tables, using recursive CTEs from SQL:1999 or Oracle's CONNECT BY.
Hierarchical Bayesian analysis
Hierarchical Bayesian analysis is a statistical modeling approach in which parameters have priors structured in multiple levels, partially pooling information across groups during Bayesian inference.
Hierarchical black hole merger formation
Hierarchical black hole merger formation is the process in which a black hole formed in an earlier merger pairs with another black hole and merges again.
Hierarchical clustering
Hierarchical clustering, also known as agglomerative clustering, is a family of cluster analysis methods that merge or split clusters to build a nested hierarchy shown as a dendrogram.
Hierarchical Data Format
Hierarchical Data Format (HDF) is a set of file formats and libraries for storing large scientific datasets, created at NCSA in 1987 and best known through its successor HDF5, implemented in 1998.
Hierarchical database model
The hierarchical database model is a data model that organizes records as a tree, enforcing one-to-many relationships, and formed the basis of IBM's IMS, released in 1968.
Hierarchical Dirichlet process
The hierarchical Dirichlet process (HDP) is a Bayesian nonparametric prior introduced by Teh, Jordan, Beal, and Blei in 2006, letting related groups share mixture components.
Hierarchical equations of motion
The hierarchical equations of motion (HEOM), introduced by Yoshitaka Tanimura and Ryogo Kubo in 1989, are coupled equations that describe open quantum systems numerically exactly, without Markovian approximations.
Hierarchical federated learning
Hierarchical federated learning (HFL) is a distributed machine learning method in which model updates are aggregated at edge servers between clients and the cloud, cutting communication.
Hierarchical modulation
Hierarchical modulation, also called layered modulation, is a transmission technique that superimposes two data streams of different priority on a single carrier, protecting one better against noise.
Hierarchical navigable small world
Hierarchical navigable small world (HNSW) is a fully graph-based index for approximate nearest-neighbor search, introduced by Yu. A. Malkov and D. A. Yashunin in a 2018 IEEE paper.
Hierarchical organization
Hierarchical organization: ranked levels of authority in firms, states, and societies, contrasted with decentralized and network forms; evidence on performance, red tape, and history.
Hierarchical reinforcement learning
Hierarchical reinforcement learning (HRL) structures an agent into layers of policies or subgoals so complex tasks decompose into reusable subtasks, using frameworks such as options, MAXQ, and HAMs.
Hierarchical routing
Hierarchical routing is a network routing approach that organizes routers into levels or regions so each keeps detailed state only for its own region, letting large networks scale.