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NP Hard
NP may refer to: Arts and entertainment * NP (novel), ''NP'' (novel), by Japanese author Banana Yoshimoto Organizations * Nashua-Plainfield Community School District, Iowa, United States * National Party (other), various political parties * Ngee Ann Polytechnic, Singapore * Nigeria Police Force * Northern Pacific Railway (AAR reporting mark NP) * November Project, free, open-to-the-public exercise group Places * NP postcode area, Newport, Wales, UK * Nepal (ISO 3166-1 alpha-2 country code NP) ** .np, the country code top level domain (ccTLD) for Nepal Science, technology and mathematics Biology and medicine * Nucleoside phosphorylase, an enzyme * Nurse practitioner * Kallikrein 8, an enzyme * Neptunium, symbol Np, a chemical element * Nosocomial pneumonia * Natriuretic peptide Mathematics and computer science * NP (complexity), Nondeterministic Polynomial, a computational complexity class ** NP-complete, a class of decision problems ** NP-hard, a class of problems in c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NP (novel)
''NP'' (N・P) is a novel written by Japanese author Banana Yoshimoto (吉本ばなな) in 1990 in literature, 1990 and translated into English language, English in 1994 in literature, 1994 by Ann Sherif. Plot summary "NP" is both the name of the novel and of a short story collection within the novel's plot, a collection written in English by the character Sarao Takase, who committed suicide before he could translate it into Japanese. Three more people attempting to translate the collection have also committed suicide. The novel is narrated by Kazami Kano, the girlfriend of the last translator to die. Kazami becomes interested in Sarao's children while she is also trying to translate NP into Japanese. Book information ''NP'' (English edition) by Banana Yoshimoto *Hardcover - , published by Grove Press *Paperback - , published by Washington Square Press * References 1990 Japanese novels Novels by Banana Yoshimoto Grove Press books {{1990s-novel-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NP-hard
In computational complexity theory, a computational problem ''H'' is called NP-hard if, for every problem ''L'' which can be solved in non-deterministic polynomial-time, there is a polynomial-time reduction from ''L'' to ''H''. That is, assuming a solution for ''H'' takes 1 unit time, ''H''s solution can be used to solve ''L'' in polynomial time. As a consequence, finding a polynomial time algorithm to solve a single NP-hard problem would give polynomial time algorithms for all the problems in the complexity class NP. As it is suspected, but unproven, that P≠NP, it is unlikely that any polynomial-time algorithms for NP-hard problems exist. A simple example of an NP-hard problem is the subset sum problem. Informally, if ''H'' is NP-hard, then it is at least as difficult to solve as the problems in NP. However, the opposite direction is not true: some problems are undecidable, and therefore even more difficult to solve than all problems in NP, but they are probably not NP- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
No Problem
''No problem'' is an English expression, used as a response to '' thanks'' (among other functions). It is regarded by some as a less formal alternative to '' you're welcome'', which shares the same function. Informality In the culture of younger Americans, ''no problem'' is often used as a more conversational alternative to ''you're welcome''. It is widely believed that younger speakers especially favor ''no problem'' over ''you're welcome'', and empirical research has corroborated this belief. No problemo "No problemo" is "a popular elaboration" of "no problem" also used and popularized in North American English. The expression is sometimes used as an instance of "pseudo- Spanish" or Mock Spanish. An early example appears in a 1959 edition of the ''American Import and Export Bulletin'', with an advertisement stating: "Foreign shipping is No Problemo".''American Import and Export Bulletin - Volumes 50-51'' (1959), p. 278. Its usage as a Spanish expression is incorrect; a corre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Noun Phrase
A noun phrase – or NP or nominal (phrase) – is a phrase that usually has a noun or pronoun as its head, and has the same grammatical functions as a noun. Noun phrases are very common cross-linguistically, and they may be the most frequently occurring phrase type. Noun phrases often function as verb subjects and objects, as predicative expressions, and as complements of prepositions. One NP can be embedded inside another NP; for instance, ''some of his constituents'' has as a constituent the shorter NP ''his constituents''. In some theories of grammar, noun phrases with determiners are analyzed as having the determiner as the head of the phrase, see for instance Chomsky (1995) and Hudson (1990) . Identification Some examples of noun phrases are underlined in the sentences below. The head noun appears in bold. ::This election-year's politics are annoying for many people. ::Almost every sentence contains at least one noun phrase. ::Current economic weakness may be a re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nanoparticle
A nanoparticle or ultrafine particle is a particle of matter 1 to 100 nanometres (nm) in diameter. The term is sometimes used for larger particles, up to 500 nm, or fibers and tubes that are less than 100 nm in only two directions. At the lowest range, metal particles smaller than 1 nm are usually called atom clusters instead. Nanoparticles are distinguished from microparticles (1-1000 μm), "fine particles" (sized between 100 and 2500 nm), and "coarse particles" (ranging from 2500 to 10,000 nm), because their smaller size drives very different physical or chemical properties, like colloidal properties and ultrafast optical effects or electric properties. Being more subject to the Brownian motion, they usually do not sediment, like colloid, colloidal particles that conversely are usually understood to range from 1 to 1000 nm. Being much smaller than the wavelengths of visible light (400-700 nm), nanoparticles cannot be seen with ordinary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Not Placed
A bill of materials or product structure (sometimes bill of material, BOM or associated list) is a list of the raw materials, sub-assemblies, intermediate assemblies, sub-components, parts, and the quantities of each needed to manufacture an end product. A BOM may be used for communication between manufacturing partners or confined to a single manufacturing plant. A bill of materials is often tied to a production order whose issuance may generate reservations for components in the bill of materials that are in stock and requisitions for components that are not in stock. The first hierarchical databases were developed for automating bills of materials for manufacturing organizations in the early 1960s. At present, this BOM is used as a database to identify the many parts and their codes in automobile manufacturing companies. A BOM can also be visually represented by a product structure tree, although they are rarely used in the workplace. For example, one of them is Time-Phase ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Organization For Standardization
The International Organization for Standardization (ISO ; ; ) is an independent, non-governmental, international standard development organization composed of representatives from the national standards organizations of member countries. Membership requirements are given in Article 3 of the ISO Statutes. ISO was founded on 23 February 1947, and () it has published over 25,000 international standards covering almost all aspects of technology and manufacturing. It has over 800 technical committees (TCs) and subcommittees (SCs) to take care of standards development. The organization develops and publishes international standards in technical and nontechnical fields, including everything from manufactured products and technology to food safety, transport, IT, agriculture, and healthcare. More specialized topics like electrical and electronic engineering are instead handled by the International Electrotechnical Commission.Editors of Encyclopedia Britannica. 3 June 2021.Inte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphorus Nitride
Phosphorus nitride refers to several chemical compounds of phosphorus and nitrogen Nitrogen is a chemical element; it has Symbol (chemistry), symbol N and atomic number 7. Nitrogen is a Nonmetal (chemistry), nonmetal and the lightest member of pnictogen, group 15 of the periodic table, often called the Pnictogen, pnictogens. ...: * Phosphorus mononitride * Tetraphosphorus hexanitride * Triphosphorus pentanitride {{Short pages monitor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Power Number
: For Newton number, see also Kissing number in the sphere packing problem. The power number ''N''p (also known as Newton number) is a commonly used dimensionless number relating the resistance force to the inertia force. The power-number has different specifications according to the field of application. E.g., for stirrers the power number is defined as: : N_\mathrm = \frac with *''P'': power *''ρ'': fluid density *''n'': rotational speed in revolutions per second *''D'': diameter In geometry, a diameter of a circle is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle. It can also be defined as the longest Chord (geometry), chord of the circle. Both definitions a ... of stirrer References Dimensionless numbers of fluid mechanics Fluid dynamics {{fluiddynamics-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neper
The neper (symbol: Np) is a logarithmic unit for ratios of measurements of physical field and power quantities, such as gain and loss of electronic signals. The unit's name is derived from the name of John Napier, the inventor of logarithms. As is the case for the decibel and bel, the neper is a unit defined in the international standard ISO 80000. It is not part of the International System of Units (SI), but is accepted for use alongside the SI. Definition Like the decibel, the neper is a unit in a logarithmic scale. While the bel uses the decadic (base-10) logarithm to compute ratios, the neper uses the natural logarithm, based on Euler's number (). The level of a ratio of two signal amplitudes or root-power quantities, with the unit neper, is given by : L = \ln\frac\mathrm, where x_1 and x_2 are the signal amplitudes, and is the natural logarithm. The level of a ratio of two power quantities, with the unit neper, is given by : L = \frac \ln\frac\mathrm, where ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neopentane
Neopentane, also called 2,2-dimethylpropane, is a double-branched-chain alkane with five carbon atoms. Neopentane is a flammable gas at room temperature and pressure which can condense into a highly volatile liquid on a cold day, in an ice bath, or when compressed to a higher pressure. Neopentane is the simplest alkane with a quaternary carbon, and has achiral tetrahedral symmetry. It is one of the three structural isomers with the molecular formula C5H12 (pentanes), the other two being ''n''-pentane and isopentane. Out of these three, it is the only one to be a gas at standard conditions; the others are liquids. It was first synthesized by Russian chemist in 1870. Nomenclature The traditional name neopentane, coined by William Odling in 1876, was still retained in the 1993 IUPAC recommendations, but is no longer recommended according to the 2013 recommendations. The preferred IUPAC name is the systematic name 2,2-dimethylpropane, but the substituent numbers are su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
