16-letter words containing p, a, c, k, r
- anode dark space — the dark region between the anode glow and the anode in a vacuum tube, occurring when the pressure is low.
- aston dark space — the dark region between the cathode and the cathode glow in a vacuum tube, occurring when the pressure is low.
- back-propagation — (Or "backpropagation") A learning algorithm for modifying a feed-forward neural network which minimises a continuous "error function" or "objective function." Back-propagation is a "gradient descent" method of training in that it uses gradient information to modify the network weights to decrease the value of the error function on subsequent tests of the inputs. Other gradient-based methods from numerical analysis can be used to train networks more efficiently. Back-propagation makes use of a mathematical trick when the network is simulated on a digital computer, yielding in just two traversals of the network (once forward, and once back) both the difference between the desired and actual output, and the derivatives of this difference with respect to the connection weights.
- background paper — a report or other piece of writing that is intended to provide contextual and historical information that will help people understand a particular topic or situation
- bacterioplankton — (biology) The bacterial component of marine plankton.
- bankruptcy court — a section of the United States federal court which specializes in the handling of bankruptcy cases
- bankruptcy order — a court order appointing a receiver to manage the property of a debtor or bankrupt
- bashkir republic — a constituent republic of E central Russia, in the S Urals: established as the first Soviet autonomous republic in 1919; rich mineral resources. Capital: Ufa. Pop: 4 012 900 (2002). Area: 143 600 sq km (55 430 sq miles)
- black propaganda — propaganda that does not come from the source it claims to come from
- black woodpecker — a large woodpecker, Dryocopus martius, found in parts of Eurasia and Africa
- black-light trap — a trap for insects that uses ultraviolet light as an attractant.
- blink comparator — an optical instrument used to detect small differences in two photographs of the same field or object by viewing them alternately, switching rapidly from one to the other.
- carpatho-ukraine — a region in W Ukraine: ceded by Czechoslovakia in 1945.
- chernobyl packet — (networking) /cher-noh'b*l pak'*t/ A network packet that induces a broadcast storm and/or network meltdown, named in memory of the April 1986 nuclear accident at Chernobyl in Ukraine. The typical scenario involves an IP Ethernet datagram that passes through a gateway with both source and destination Ethernet address and IP address set as the respective broadcast addresses for the subnetworks being gated between. Compare Christmas tree packet.
- cooperative bank — a cooperative savings institution, chartered and regulated by a state or the federal government, that receives deposits in exchange for shares of ownership and invests its funds chiefly in loans secured by first mortgages on homes.
- cracked up to be — alleged or believed to be
- cracker capacity — The cracker capacity is the amount of a particular product which a refinery can produce.
- educational park — a group of elementary and high schools, usually clustered in a parklike setting and having certain facilities shared by all grades, that often accommodates students from a large area.
- formation packer — A formation packer is a substance that is used as a seal between the casing and the borehole so that part of the hole can be tested.
- hairy woodpecker — a North American woodpecker, Picoides villosus, resembling but larger than the downy woodpecker.
- hard-packed snow — snow which becomes very firmly packed as it becomes refrozen due to cold weather conditions rather than melting
- imperfect market — a market where buyers or sellers can influence the market, and there is a lack of product information
- information pack — a set of leaflets giving information about something
- inter-packet gap — (networking) A time delay between successive data packets mandated by the network standard for protocol reasons. In Ethernet, the medium has to be "silent" (i.e., no data transfer) for a few microseconds before a node can consider the network idle and start to transmit. This is necessary for fairness reasons. The delay time, which approximately equals the signal propagation time on the cable, allows the "silence" to reach the far end so that all nodes consider the net idle.
- kaposi's sarcoma — a form of skin cancer found in Africans and more recently in victims of AIDS
- khakass republic — a constituent republic of S central Russia, formerly in Krasnoyarsk Territory: formed in 1930. Capital: Abakan. Pop: 546 100 (2002). Area: 61 900 sq km (23 855 sq miles)
- knapsack problem — the problem of determining which numbers from a given collection of numbers have been added together to yield a specific sum: used in cryptography to encipher (and sometimes decipher) messages.
- knock for a loop — a portion of a cord, ribbon, etc., folded or doubled upon itself so as to leave an opening between the parts.
- make a pitch for — to give verbal support to
- packing fraction — Physics. a measure of the stability of an atomic nucleus, equal to 10 4 multiplied by the mass defect and divided by the mass number.
- pharmacokinetics — the branch of pharmacology that studies the fate of pharmacological substances in the body, as their absorption, distribution, metabolism, and elimination.
- pocket billiards — pool2 (def 1).
- pocket secretary — a long, narrow walletlike case, usually of leather and containing pockets for credit and business cards, paper money, etc., and sometimes a notepad and pencil.
- pork scratchings — small pieces of crisply cooked pork crackling, eaten cold as an appetizer with drinks
- posigrade rocket — an auxiliary rocket used to separate the sections of a multistage rocket, fired in the direction of flight.
- punctuation mark — any of a group of conventional marks or characters used in punctuation, as the period, comma, semicolon, question mark, or dash.
- rape of the lock — a mock-epic poem (1712) by Alexander Pope.
- river carpsucker — a carpsucker, Carpiodes carpio, found in silty rivers of the central U.S. south to Mexico.
- sick as a parrot — very disappointed
- software package — bundle of files to execute computer program
- spanish mackerel — an American game fish, Scomberomorus maculatus, inhabiting the Atlantic Ocean.
- spotted mackerel — a small mackerel, Scomberomorus queenslandicus, of northern Australian waters
- sticking plaster — an adhesive cloth or other material for covering and closing superficial wounds, holding bandages in place, etc.
- to keep a secret — If you say that someone can keep a secret, you mean that they can be trusted not to tell other people a secret that you have told them.
- trick photograph — a photograph that creates an illusion
- trucking company — a company that transports goods by lorry
- vest-pocket park — pocket park.
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