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DBm
DBM or dbm may refer to: Science and technology * dBm, a unit for power measurement * DBM (computing), family of key-value database engines including dbm, ndbm, gdbm, and Berkeley DB * Database Manager (DBM), a component of 1987's ''Extended Edition v1.0'' release of IBM's OS/2 operating system * Dibenzoylmethane, an aromatic diketone: 1,3-diphenylpropane-1,3-dione * Dibromomethane, a halomethane * Difference bound matrix, a data structure used in a field of computer science * Dibutyl maleate, an organic chemical compound Other uses * D. B. M. Patnaik (1925–2009), Indian lawyer, politician and communist leader * De Bellis Multitudinis, a wargame ruleset * Department of Budget and Management The Department of Budget and Management (DBM; fil, Kagawaran ng Badyet at Pamamahala) is an executive body under the Office of the President of the Philippines. It is responsible for the sound and efficient use of government resources for nati ..., the executive department in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DBM (computing)
In computing, a DBM is a library and file format providing fast, single-keyed access to data. A key-value database from the original Unix, ''dbm'' is an early example of a NoSQL system. History The original ''dbm'' library and file format was a simple database engine, originally written by Ken Thompson and released by AT&T in 1979. The name is a three letter acronym for ''DataBase Manager'', and can also refer to the family of database engines with APIs and features derived from the original ''dbm''. The ''dbm'' library stores arbitrary data by use of a single key (a primary key) in fixed-size buckets and uses hashing techniques to enable fast retrieval of the data by key. The hashing scheme used is a form of extendible hashing, so that the hashing scheme expands as new buckets are added to the database, meaning that, when nearly empty, the database starts with one bucket, which is then split when it becomes full. The two resulting child buckets will themselves split when the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OS/2
OS/2 (Operating System/2) is a series of computer operating systems, initially created by Microsoft and IBM under the leadership of IBM software designer Ed Iacobucci. As a result of a feud between the two companies over how to position OS/2 relative to Microsoft's new Windows 3.1 operating environment, the two companies severed the relationship in 1992 and OS/2 development fell to IBM exclusively. The name stands for "Operating System/2", because it was introduced as part of the same generation change release as IBM's " Personal System/2 (PS/2)" line of second-generation personal computers. The first version of OS/2 was released in December 1987 and newer versions were released until December 2001. OS/2 was intended as a protected-mode successor of PC DOS. Notably, basic system calls were modeled after MS-DOS calls; their names even started with "Dos" and it was possible to create "Family Mode" applications – text mode applications that could work on both systems. Be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dibenzoylmethane
Dibenzoylmethane (DBM) is an organic compound with the formula (C6H5C(O))2CH2. DBM is the name for a 1,3-diketone, but the compound exists primarily as one of two equivalent enol tautomers. DBM (actually its enol) is a white solid. Due to their high photostability and UV-absorbing properties, derivatives of DBM such as avobenzone, have found applications as sunscreen Sunscreen, also known as sunblock or sun cream, is a photoprotective topical product for the skin that mainly absorbs, or to a much lesser extent reflects, some of the sun's ultraviolet (UV) radiation and thus helps protect against sunburn and ... products. Synthesis and reactions DBM is prepared by condensation of ethyl benzoate with acetophenone. Like other 1,3-diketones (or their enols), DBM condenses with a variety of bifunctional reagents to give heterocycles. Hydrazine gives diphenylpyrazole. Urea and thiourea also condense to give six-membered rings. With metal salts, the conjugate base of DBM forms ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dibromomethane
Preparation Dibromomethane is prepared commercially from dichloromethane via bromochloromethane: :6 CH2Cl2 + 3 Br2 + 2 Al → 6 CH2BrCl + 2 AlCl3 :CH2Cl2 + HBr → CH2BrCl + HCl The latter route requires aluminium trichloride as a catalyst. The bromochloromethane product from either reaction can further react in a similar manner: :6 CH2BrCl + 3 Br2 + 2 Al → 6 CH2Br2 + 2 AlCl3 :CH2BrCl + HBr → CH2Br2 + HCl In the laboratory, it is prepared from bromoform: :CHBr3 + Na3AsO3 + NaOH → CH2Br2 + Na3AsO4 + NaBr using sodium arsenite and sodium hydroxide. Another way is to prepare it from diiodomethane and bromine. Uses Dibromomethane is used as a solvent, gauge fluid, and in organic synthesis (often as 1H-NMR internal standard). It is a convenient agent for converting catechols to their methylenedioxy derivatives. Natural occurrence It is naturally produced by marine algae and liberated to the oceans. Releasing on soil causes it to evaporate and leach into ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Difference Bound Matrix
In model checking, a field of computer science, a difference bound matrix (DBM) is a data structure used to represent some convex polytopes called zones. This structure can be used to efficiently implement some geometrical operations over zones, such as testing emptyness, inclusion, equality, and computing the intersection and the sum of two zones. It is, for example, used in the Uppaal model checker; where it is also distributed as an independent library. More precisely, there is a notion of canonical DBM; there is a one-to-one relation between canonical DBMs and zones and from each DBM a canonical equivalent DBM can be efficiently computed. Thus, equality of zone can be tested by checking for equality of canonical DBMs. Zone A difference bound matrix is used to represents some kind of convex polytopes. Those polytopes are called zone. They are now defined. Formally, a zone is defined by equations of the form x\le c, x\ge c, x_1\le x_2+c and x_1\ge x_2+c, with x_1 and x_2 some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dibutyl Maleate
Dibutyl maleate is an organic compound with the formula (CHCO2Bu)2 (Bu = butyl). It is the diester of the unsaturated dicarboxylic acid maleic acid. It is a colorless oily liquid, although impure samples can appear yellow. Preparation Dibutyl maleate can be prepared by the reaction of maleic acid anhydride and 1-butanol in presence of p-toluenesulfonic acid. Uses Dibutyl maleate is mainly used as a plasticizer for aqueous dispersions of copolymers with vinyl acetate and as an intermediate in the preparation of other chemical compounds. With the invention of polyaspartic technology the material found another use. In this situation, an amine is reacted with a dialkyl maleate - usually diethyl maleate but also dibutyl maleate may be used- utilizing the Michael addition reaction. The resulting products, polyaspartic esters products are then used in coatings, adhesives, sealants and elastomers An elastomer is a polymer with viscoelasticity (i.e. both viscosity and elasticity ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
De Bellis Multitudinis
De Bellis Multitudinis (DBM) () is a ruleset for table-top miniatures wargames for the period 3000 BC to 1485 AD. It is the big battle development of De Bellis Antiquitatis. As its name implies, it is aimed primarily at simulating large battles. The rules allow armies to be chosen from published Army Lists (in 4 books, with about 250 different army lists in total - but many more once all the in-list variants are taken into account) using a points system to select roughly equal armies if required. History DBM was written by the UK based Wargames Research Group (WRG) team of Phil Barker, Richard Bodley Scott and Sue Laflin Barker. ( DBMM is Phil Barker's intended successor to DBM). First published in 1993, it went through a number of formal revisions with the last published version, DBM 3.0, coming out in 2000. Two unpublished, minor revisions have since been made, with the latest, DBM 3.2, coming into use in 2011 and available through WRG's website. DBM evolved from the ear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Department Of Budget And Management
The Department of Budget and Management (DBM; fil, Kagawaran ng Badyet at Pamamahala) is an executive body under the Office of the President of the Philippines. It is responsible for the sound and efficient use of government resources for national development and also as an instrument for the meeting of national socio-economic and political development goals. The department has four undersecretaries and four assistant secretaries. History At the beginning of the 20th century, the Second Philippine Commission, acting as a legislative body, enacted appropriations measures for the annual expenditures of the government. This was in accordance with the Philippine Bill of 1902, which decreed that disbursements from the national treasury were to be authorized only in pursuance of appropriations made by law. With the passage of the Jones Law in 1916, the Philippine Legislature was set up with two chambers: the Philippine Senate and the House of Representative. The governor-general w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
D-flat Minor
D-flat minor is a theoretical key based on D, consisting of the pitches D, E, F, G, A, B, and C. Its key signature has six flats and one double flat. Its relative major is F-flat major, which is usually replaced by E major. Its parallel major is D-flat major, and its direct enharmonic equivalent, C-sharp minor, is normally used. The D-flat natural minor scale is: : Changes needed for the melodic and harmonic versions of the scale are written in with accidentals as necessary. The D-flat harmonic minor and melodic minor scales are: : : D-flat minor is usually notated as the enharmonic key of C-sharp minor, as in the second and third measures of Amy Beach's ''Canticle of the Sun''. However, unusually, two of Verdi's most well-known operas, ''La traviata'' and ''Rigoletto'', both end in D-flat minor (although written with the five-flat key signature of the parallel major). Mahler's thematic motif "der kleine Appell" ("call to order") from his Fourth and Fifth Symp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Downtown Battle Mountain
''Downtown Battle Mountain'' is the debut studio album by American post-hardcore band Dance Gavin Dance, released on May 15, 2007, on Rise Records. The album serves as a follow-up to the band's debut extended play, '' Whatever I Say Is Royal Ocean'', which was released in 2006. The title of the album was inspired by the unincorporated town Battle Mountain, Nevada after the band visited the city. The album was produced by Kris Crummett, who would go on to produce most of the band's future studio releases. The album was supported by four singles; "And I Told Them I Invented Times New Roman", "Lemon Meringue Tie", "The Backwards Pumpkin Song", and "Open Your Eyes and Look North". It is the band's first of two studio albums to feature clean vocalist Jonny Craig. Craig left in late 2007, later re-joining in mid-2010. It is also the band's only full-length to feature guitarist Sean O'Sullivan, who left the band in late 2007. A non-direct sequel to the album, titled ''Downtown Battle M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drake, Beam, Morin
The Adecco Group, is a Swiss- French company based in Zurich, Switzerland, and is the world's second largest Human Resources provider and temporary staffing firm, and a Fortune Global 500 company. They directly employ 700,000 people a day, and with the expansion of its operations to China, the number of people working under them totals up to 3.5 million. The company was formed officially on 1 January 1997 as a result of the merger of the French company Ecco and the Swiss company Adia Interim, and is listed on the SIX Swiss Exchange (ADEN, ISIN CH0012138605). Adia was established in 1957 in Lausanne (Switzerland) by Henri Lavanchy. Ecco was founded in Lyon (France) at the initiative of Philippe Foriel Destezet. In 2000, The Adecco Group acquired Olsten Staffing, in the US, becoming the number one recruitment company in that country. In 2010, it acquired MPS Group and thus became the number one company worldwide. The Adecco Group is the parent company of various brands ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
