Ear

The ear is the organ of the sense of hearing, and in mammals is also an organ of balance. In mammals, the ear is usually described as having three parts—the outer ear, middle ear and the inner ear. The outer ear consists of the auricle or pinna, and the ear canal. The middle ear includes the tympanic cavity and the three ossicles. The inner ear consists of the bony labyrinth which contains the semicircular canals, and the utricle and saccule of the vestibular system, to do with balance, and the cochlea a part of the auditory system.

The ear develops from the first pharyngeal pouch and six small swellings that develop in the early embryo called otic placodes, which are derived from ectoderm.

A number of conditions may relate to the ear, including hearing loss, tinnitus and balance disorders including vertigo, however these may also relate to diseases affecting the pathways in the brain relating to hearing and balance.

Although the entire organ is considered as the ear, it is often just referred to as the visible outer part. In most mammals, the visible ear is a flap of tissue that is also called the pinna (or auricle in humans) and is the first stage in hearing. The ears of vertebrates are placed somewhat symmetrically on either side of the head, an arrangement that aids sound localization.

EAR (file format)

EAR (Enterprise ARchive) is a file format used by Java EE for packaging one or more modules into a single archive so that the deployment of the various modules onto an application server happens simultaneously and coherently. It also contains XML files called deployment descriptors which describe how to deploy the modules.

Ant, Maven, or Gradle can be used to build EAR files.

File structure

An EAR file is a standard JAR file (and therefore a Zip file) with a .ear extension, with one or more entries representing the modules of the application, and a metadata directory called META-INF which contains one or more deployment descriptors.

Module

Developers can embed various artifacts within an EAR file for deployment by application servers:

Ear (disambiguation)

The ear is the sense organ that detects sound.

Ear may also refer to:

EAR may refer to:

Vertex (geometry)

In geometry, a vertex (plural: vertices or vertexes) is a point where two or more curves, lines, or edges meet. As a consequence of this definition, the point where two lines meet to form an angle and the corners of polygons and polyhedra are vertices.

Definition

Of an angle

The vertex of an angle is the point where two rays begin or meet, where two line segments join or meet, where two lines intersect (cross), or any appropriate combination of rays, segments and lines that result in two straight "sides" meeting at one place.

Of a polytope

A vertex is a corner point of a polygon, polyhedron, or other higher-dimensional polytope, formed by the intersection of edges, faces or facets of the object.

In a polygon, a vertex is called "convex" if the internal angle of the polygon, that is, the angle formed by the two edges at the vertex, with the polygon inside the angle, is less than π radians ( 180°, two right angles) ; otherwise, it is called "concave" or "reflex". More generally, a vertex of a polyhedron or polytope is convex if the intersection of the polyhedron or polytope with a sufficiently small sphere centered at the vertex is convex, and concave otherwise.

Ear (rune)

The Ear ᛠ rune of the Anglo-Saxon futhorc is a late addition to the alphabet. It is, however, still attested from epigraphical evidence, notably the Thames scramasax, and its introduction thus cannot postdate the 9th century. It is transliterated as ea, and the Anglo-Saxon rune poem glosses it as

Jacob Grimm in his 1835 Teutonic Mythology (ch. 9)attached a deeper significance to the name. He interprets the Old English poem as describing "death personified", connected to the death-bringing god of war, Ares. He notes that the ear rune is simply a Tyr rune with two barbs attached to it and suggests that Tir and Ear, Old High German Zio and Eor, were two names of the same god. He finds the name in the toponym of Eresburg (*Eresberc) in Westphalia, in Latin Mons martis. Grimm thus suggests that the Germans had adopted the name of Greek Ares as an epithet of their god of war, and Eresberc was literally an Areopagus. Grimm further notes that in the Bavarian (Marcomannic) area, Tuesday (dies Martis) was known as Ertag, Iertag, Irtag, Eritag, Erchtag, Erichtag as opposed to the Swabian and Swiss (Alemannic) region where the same day is Ziestag as in Anglo-Saxon. Grimm concludes that Ziu was known by the alternative name Eor, derived from Greek Ares, and also as Saxnot among the Saxons, identified as a god of the sword.

Ear decomposition

In graph theory, an ear of an undirected graph G is a path P where the two endpoints of the path may coincide, but where otherwise no repetition of edges or vertices is allowed, so every internal vertex of P has degree two in P. An ear decomposition of an undirected graph G is a partition of its set of edges into a sequence of ears, such that the one or two endpoints of each ear belong to earlier ears in the sequence and such that the internal vertices of each ear do not belong to any earlier ear. Additionally, in most cases the first ear in the sequence must be a cycle. An open ear decomposition or a proper ear decomposition is an ear decomposition in which the two endpoints of each ear after the first are distinct from each other.

Ear decompositions may be used to characterize several important graph classes, and as part of efficient graph algorithms. They may also be generalized from graphs to matroids.

Characterizing graph classes

Several important classes of graphs may be characterized as the graphs having certain types of ear decompositions.