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19-letter words containing u, r, i

  • difference equation — (mathematics)   A relation between consecutive elements of a sequence. The first difference is D u(n) = u(n+1) - u(n) where u(n) is the nth element of sequence u. The second difference is u(n+2) + a u(n+1) + b u(n) = 0 can be converted to a difference equation (in this case, a second order linear difference equation): D2 u(n) + p D u(n) + q u(n) = 0 and vice versa. a, b, p, q are constants.
  • differential backup — (operating system)   A kind of backup that copies all files that have changed since the last full backup. Each differential backup will include all files in previous differential backups since the full backup so to restore a version of a file, you only need to search the full backup and the relevant differential backup. Some systems support differential backup by associating an "Archive" flag with each file and setting this flag whenever the file is modified to indicate that it should be included in the next backup. A differential backup does not change this flag, whereas an incremental backup resets it.
  • diminishing returns — any rate of profit, production, benefits, etc., that beyond a certain point fails to increase proportionately with added investment, effort, or skill.
  • directional coupler — (communications)   (tap) A passive device used in cable systems to divide and combine radio frequency signals. A directional coupler has at least three ports: line in, line out, and the tap. The signal passes between line in and line out ports with loss referred to as the insertion loss. A small portion of the signal power applied to the line in port passes to the tap port. A signal applied to the tap port is passed to the line in port less the tap attenuation value. The tap signals are isolated from the line out port to prevent reflections. A signal applied to the line out port passes to the line in port and is isolated from the tap port. Some devices provide more than one tap output line (multi-taps).
  • director of studies — a member of staff at an educational institution who has responsibility for overseeing the curriculum
  • directory enquiries — Directory enquiries is a service which you can telephone to find out someone's telephone number.
  • discovery procedure — any rigorous method by the application of which a grammar might be constructed from a corpus of utterances in a language; an algorithm leading from data to a formulation.
  • discretionary trust — a trust in which the beneficiaries' shares are not fixed in the trust deed but are left to the discretion of other persons, often the trustees
  • discriminated union — (theory)   The discriminated union of two sets A and B is A + B = {(inA, a) | a in A} U {(inB, b)| b in B} where inA and inB are arbitrary tags which specify which summand an element originates from. A type (especially an algebraic data type) might be described as a discriminated union if it is a sum type whose objects consist of a tag to say which part of the union they belong to and a value of the corresponding type.
  • disjunctive pronoun — an inflection of pronouns in some languages that is used alone or after a preposition, such as moi in French
  • distance university — a degree-granting institution operating wholly or mainly by correspondence courses for students not resident on or within commuting distance of the campus.
  • distinctive feature — a feature of the sound system of a language that serves as the crucial distinguishing mark between two phonemes, as the distinctive feature of voicing, which distinguishes b from p in English, or nasality, which distinguishes m from b and p.
  • distributed systems — distributed system
  • distribution system — The distribution system is the part of an electric system after the transmission system that is dedicated to delivering electric energy to an end user.
  • do not disturb sign — A do not disturb sign is a sign that a guest in a hotel hangs outside their room to tell other people not to knock the door or enter.
  • domain architecture — (systems analysis)   A generic, organisational structure or design for software systems in a domain. The domain architecture contains the designs that are intended to satisfy requirements specified in the domain model. A domain architecture can be adapted to create designs for software systems within a domain and also provides a framework for configuring assets within individual software systems.
  • double counterpoint — invertible counterpoint using two transposable voices.
  • double-helical gear — herringbone gear.
  • draw the curtain on — to end
  • dry-bulk cargo ship — a ship that carries an unpackaged dry cargo such as coal or grain; bulk carrier
  • early purple orchid — a Eurasian orchid, Orchis mascula, with purplish-crimson flowers and stems marked with blackish-purple spots
  • earthquake engineer — a civil engineer who studies the effects of seismic activity on structures and consults on earthquake-resistant design and construction.
  • east dunbartonshire — a council area of central Scotland to the N of Glasgow: part of Strathclyde region from 1975 until 1996: mainly agricultural and residential. Administrative centre: Kirkintilloch. Pop: 106 970 (2003 est). Area: 172 sq km (66 sq miles)
  • ebola virus disease — Also called Ebola fever, Ebola hemorrhagic fever, Ebola virus disease. a usually fatal disease, a type of hemorrhagic fever, caused by the Ebola virus and marked by high fever, severe gastrointestinal distress, and bleeding.
  • educational adviser — a person who provides advice and training to teachers about teaching methods and educational policies
  • elastomeric closure — An elastomeric closure is a component that closes a piece of packaging. An elastomeric closure is made from a material that is able to resume its original shape when it is removed from the packaging and may be in direct contact with the drug enclosed in the pack.
  • electroconductivity — Electrical conductivity.
  • electroluminescence — Luminescence produced electrically, especially in a phosphor by the application of a voltage.
  • electron multiplier — a device for amplifying and measuring a flux of electrons. Each electron hits an anode surface and releases secondary electrons that are accelerated to a second surface; after several such stages a measurable pulse of current is obtained
  • electrostatic units — the system of CGS electric and magnetic units that assigns the value of one to the dielectric constant of a vacuum
  • electrotherapeutics — (medicine) the use of electricity in therapeutics.
  • employment tribunal — (in England, Scotland, and Wales) a tribunal that rules on disputes between employers and employees regarding unfair dismissal, redundancy, etc
  • endowment insurance — Endowment insurance is a type of life insurance that pays a particular sum directly to the policyholder at a stated date, or to a beneficiary if the policyholder dies before this date.
  • entry qualification — the qualifications and conditions required to join an organization, club, etc
  • environmental audit — the systematic examination of an organization's interaction with the environment, to assess the success of its conservation or antipollution programme
  • equal opportunities — Equal opportunities refers to the policy of giving everyone the same opportunities for employment, pay and promotion, without discriminating against particular groups.
  • equatorial mounting — an astronomical telescope mounting that allows motion of the telescope about two mutually perpendicular axes, one of which is parallel to the earth's axis
  • equatorial zenithal — a type of map projection in which part of the earth's surface is projected onto a plane tangential to it at the equator
  • euclidean algorithm — Euclid's Algorithm
  • european commission — the executive body of the European Union formed in 1967, which initiates action in the EU and mediates between member governments
  • european parliament — law: assembly in Strasbourg
  • evaluation strategy — reduction strategy
  • exclusion principle — Pauli exclusion principle
  • executive agreement — an agreement made between the US President and the head of a foreign state, having the effect of a treaty
  • executive president — a president in certain systems of government who possesses wide powers
  • executive privilege — Executive privilege is the right that a member of the executive branch of government has to withhold information about matters that they consider to be confidential.
  • executive secretary — supports executives or departments
  • factitious disorder — any of various syndromes, as Münchausen syndrome, characterized by physical or psychological symptoms intentionally produced by a person and under voluntary control.
  • fault tolerant unix — (operating system)   (FTX) Stratus's own Unix System V Release 4 multiprocessor operating system. In 2016, FTX is supported but no longer developed. FTX was one of three operating systems supplied by Stratus on their hardware, the other two, HP-UX and VOS, were the more common choices, FTX was only sold on an exceptional basis. Early FTX 3.x releases used an in-house virtual disk layer (VDL) driver, but later releases switched to a version of Veritas VxVM. FTX supported many of the proprietary communications boards (ISDN, serial, parallel, X.25, etc.).
  • fault tree analysis — (programming)   A form of safety analysis that assesses hardware safety to provide failure statistics and sensitivity analyses that indicate the possible effect of critical failures.
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