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28-letter words containing t, r, a, i, n, e

  • partial equivalence relation — (PER) A relation R on a set S where R is symmetric (x R y => y R x) and transitive (x R y R z => x R z) and where there may exist elements in S for which the relation is not defined. A PER is an equivalence relation on the subset for which it is defined, i.e. it is also reflexive (x R x).
  • pentaerythritol tetranitrate — a white, crystalline, water-insoluble, explosive solid, C 5 H 8 N 4 O 1 2 , used chiefly as a high explosive and as a vasodilator in treating angina pectoris.
  • permanent virtual connection — Permanent Virtual Circuit
  • persistent organic pollutant — a toxin resulting from a manufacturing process, which remains in the environment for many years
  • personal liability insurance — Personal liability insurance protects the insured if they are sued for claims that are covered by the insurance policy.
  • phenylmethylcarbinyl acetate — methylphenylcarbinyl acetate.
  • plug compatible manufacturer — (company)   (PCM) A manufacturer of equipment that some other manufacturer's system can identify and work with. The PCM's device replaces the original manufacturer's. Most PCMs competed with IBM. PCM devices normally offer a cost-performance benefit over the original device. For example, several PCM versions of the Direct-Access Storage Device IBM 3350 offered twice the storage and improved data access (dual port). Plug compatible devices include replacement CPUs, such as the Hitachi 7/90 series (which could be substituted for IBM 3090 series processors), I/O subsystems, and dumb terminals like the IBM 3270.
  • positron emission tomography — the process of producing a PET scan.
  • potassium antimonyl tartrate — a white, water-soluble, sweet and metallic-tasting, poisonous powder or granules, C 4 H 4 KO 7 Sb, used as a mordant for dyeing textiles and leather, and in medicine as an expectorant, for inducing vomiting, and for infections by schistosomes.
  • principle of complementarity — complementarity principle.
  • probability density function — a function of a continuous variable whose integral over a region gives the probability that a random variable falls within the region.
  • quaternary ammonium compound — any of a class of salts derived from ammonium in which the nitrogen atom is attached to four organic groups, as in benzalkonium chloride; the salts are cationic surface-active compounds used as antiseptics and disinfectants.
  • quick mail queueing protocol — (communications)   (QMQP) A protocol that provides a central e-mail queue for a cluster of hosts. QMOP is supposed to provide fast transfers of messages with many recipients as it can batch them up as a single transaction. It listens on port 628.
  • quick mail transfer protocol — (communications)   (QMTP) An SMTP replacement that works better over high latency links as it doesn't require as much interaction as SMTP. QMTP listens on port 209 and is used by qmail.
  • radio frequency interference — (hardware, testing)   (RFI) Electromagnetic radiation which is emitted by electrical circuits carrying rapidly changing signals, as a by-product of their normal operation, and which causes unwanted signals (interference or noise) to be induced in other circuits. The most important means of reducing RFI are: use of bypass or "decoupling" capacitors on each active device (connected across the power supply, as close to the device as possible), risetime control of high speed signals using series resistors and VCC filtering. Shielding is usually a last resort after other techniques have failed because of the added expense of RF gaskets and the like. The efficiency of the radiation is dependent on the height above the ground or power plane (at RF one is as good as the other) and the length of the conductor in relationship to the wavelength of the signal component (fundamental, harmonic or transient (overshoot, undershoot or ringing)). At lower frequencies, such as 133 MHz, radiation is almost exclusively via I/O cables; RF noise gets onto the power planes and is coupled to the line drivers via the VCC and ground pins. The Rf is then coupled to the cable through the line driver as common node noise. Since the noise is common mode, shielding has very little effect, even with differential pairs. The RF energy is capacitively coupled from the signal pair to the shield and the shield itself does the radiating. At higher frequencies, usually above 500 Mhz, traces get electrically longer and higher above the plane. Two techniques are used at these frequencies: wave shaping with series resistors and embedding the traces between the two planes. If all these measures still leave too much RFI, sheilding such as RF gaskets and copper tape can be used. Most digital equipment is designed with metal, or coated plastic, cases. Switching power supplies can be a source of RFI, but have become less of a problem as design techniques have improved. Most countries have legal requirements that electronic and electrical hardware must still work correctly when subjected to certain amounts of RFI, and should not emit RFI which could interfere with other equipment (such as radios). See also Electrostatic Discharge, Electromagnetic Compatibility.
  • raise specification language — (language)   (RSL) (RAISE = Rigorous Approach to Industrial Software Engineering). A wide-spectrum specification and design language developed by ESPRIT Project 315 at CRI A/S, Denmark. Systems may be modular, concurrent and nondeterministic. Specifications may be applicative or imperative, explicit or implicit, abstract or concrete.
  • read the riot act to someone — to warn or reprimand someone severely
  • real time streaming protocol — (multimedia, networking, protocol)   (RTSP) An application layer protocol for controlling delivery of a stream of real-time multimedia content. RTSP allows users to start playing from a certain position. It does not actually deliver the data, but works alongside existing delivery channels such as UDP, TCP, or IP multicast. RTSP was developed by RealNetworks, Netscape Communications, and Columbia University, and is described in RFC 2326, April 1998. RTSP is an IETF proposed standard.
  • real-estate investment trust — an unincorporated trust created for the purpose of investing in real property or to extend credit to those engaged in construction. Abbreviation: REIT.
  • real-time transport protocol — (protocol)   (RTP) An Internet protocol for transmitting real-time data such as audio and video. RTP itself does not guarantee real-time delivery of data, but it does provide mechanisms for the sending and receiving applications to support streaming data. Typically, RTP runs on top of the UDP protocol, although the specification is general enough to support other transport protocols. RTP has received wide industry support. Netscape intends to base its LiveMedia technology on RTP, and Microsoft claims that its NetMeeting product supports RTP.
  • reflexive transitive closure — Two elements, x and y, are related by the reflexive transitive closure, R+, of a relation, R, if they are related by the transitive closure, R*, or they are the same element.
  • regular expression converter — CONVERT
  • relative index of refraction — a number indicating the speed of light in a given medium as either the ratio of the speed of light in a vacuum to that in the given medium (absolute index of refraction) or the ratio of the speed of light in a specified medium to that in the given medium (relative index of refraction) Symbol: n.
  • robert william andrew feller — Robert William Andrew ("Bob"; "Bullet Bob") 1918–2010, U.S. baseball player.
  • rocky mountain spotted fever — an infectious disease characterized by high fever, pains in joints, bones, and muscles, and a cutaneous eruption, caused by rickettsii and transmitted by ticks: first reported in the Rocky Mountain area, but now more widely distributed.
  • scanning electron microscope — a device in which the specimen is examined point by point directly in a moving electron beam, and electrons reflected by the specimen are used to form a magnified, three-dimensional image on a television screen. Abbreviation: SEM.
  • second law of thermodynamics — any of three principles variously stated in equivalent forms, being the principle that the change of energy of a thermodynamic system is equal to the heat transferred minus the work done (first law of thermodynamics) the principle that no cyclic process is possible in which heat is absorbed from a reservoir at a single temperature and converted completely into mechanical work (second law of thermodynamics) and the principle that it is impossible to reduce the temperature of a system to absolute zero in a finite number of operations (third law of thermodynamics)
  • secondary sex characteristic — any of a number of manifestations, as development of breasts or beard, muscularity, distribution of fat tissue, and change of pitch in voice, specific to each sex and incipient at puberty but not essential to reproduction.
  • self-regulating organization — one of several British organizations set up in 1986 under the auspices of the Securities and Investment Board to regulate the activities of London investment markets
  • semiconservative replication — replication.
  • service advertising protocol — (networking)   (SAP) A Novell NetWare protocol. SAP follows the spirit of the Xerox Clearinghouse protocol, it permits file, print, and gateway servers to advertise their services and addresses.
  • sexually transmitted disease — any disease characteristically transmitted by sexual contact, as gonorrhea, syphilis, genital herpes, and chlamydia. Abbreviation: STD.
  • shared-appreciation mortgage — a type of mortgage that carries a smaller down payment or lower interest rate than usual in return for the lender's sharing in the appreciation of the property at some future date, as at the time of its sale. Abbreviation: SAM.
  • sign one's own death warrant — A death warrant is an official document which orders that someone is to be executed as a punishment for a crime.
  • simulation oriented language — (language)   (SOL) An ALGOL extension for discrete simulation by Donald Knuth and McNeley.
  • single sideband transmission — a method of transmitting radio waves in which either the upper or the lower sideband is transmitted, the carrier being either wholly or partially suppressed. This reduces the required bandwidth and improves the signal-to-noise ratio
  • smooth endoplasmic reticulum — a network of tubular membranes within the cytoplasm of the cell, occurring either with a smooth surface (smooth endoplasmic reticulum) or studded with ribosomes (rough endoplasmic reticulum) involved in the transport of materials.
  • software productivity centre — (body)   (SPC) A non-profit organisation based in Vancouver, BC, Canada with the mandate to assist software developers to improve their software engineering process.
  • special power of appointment — authority to appoint persons from a particular class to take an estate or interest in property
  • spectral luminous efficiency — a measure of the efficiency of radiation of a given wavelength in producing a visual sensation. It is equal to the ratio of the radiant flux at a standard wavelength to that at the given wavelength when the standard wavelength is chosen so that the maximum value of this ratio is unity
  • standard operating procedure — a set of fixed instructions or steps for carrying out usually routine operations. Abbreviation: SOP.
  • state university of new york — (body)   (SUNY) The public university system of New York State, USA, with campuses throughout the state.
  • strictly decreasing function — a function having the property that for any two points in the domain such that one is larger than the other, the image of the larger point is less than the image of the smaller point.
  • strictly increasing function — a function having the property that for any two points in the domain such that one is larger than the other, the image of the larger point is greater than the image of the smaller point.
  • sudden infant death syndrome — death from the sudden cessation of breathing (apnea) of a seemingly healthy infant, almost always during sleep, sometimes traceable to a chronic oxygen deficiency. Abbreviation: SIDS.
  • supplemental security income — income provided by the U.S. government to needy aged, blind, and disabled persons. Abbreviation: SSI.
  • systems administrators guild — (body, job)   (SAGE) A special technical group of the USENIX Association.
  • systems network architecture — (networking)   (SNA) IBM's proprietary high level networking protocol standard, used by IBM and IBM compatible mainframes. Also referred to as "Blue Glue", SNA is a bletcherous protocol once widely favoured at commercial shops. The official IBM definition is "that which binds blue boxes together." It may be relevant that Blue Glue is also a 3M product commonly used to hold down carpets in dinosaur pens.
  • take your eyes off something — When you take your eyes off the thing you have been watching or looking at, you stop looking at it.
  • tannu tuva people's republic — former name of Tuva Autonomous Republic.
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