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DEM
DEM was the ISO 4217 currency code for the Deutsche Mark, former currency of Germany Computing * Digital elevation model, a digital representation of ground-surface topography or terrain ** .dem, a common extension for USGS DEM files * Discrete element method or discrete element modeling, a family of numerical methods for computing the motion of a large number of small particles (like molecules or grains of sand) * Diffuse element method, a numerical simulation method used (for example) to solve partial differential equations * Display Encode Mode, a feature of the AMD's Video Codec Engine * Distance Estimation Method, for drawing Julia sets or Mandelbrot sets Organisations * Department of Environmental Management, a name of various government entities * Democratic Party, short form of the name of the political parties in the world * Democratic Party (United States) * Democrats (Brazil) * Dravske elektrarne Maribor d.o.o., an electric power company in Slovenia * Day Eig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital Elevation Model
A digital elevation model (DEM) or digital surface model (DSM) is a 3D computer graphics representation of elevation data to represent terrain or overlaying objects, commonly of a planet, moon, or asteroid. A "global DEM" refers to a discrete global grid. DEMs are used often in geographic information systems (GIS), and are the most common basis for digitally produced relief maps. A digital terrain model (DTM) represents specifically the ground surface while DEM and DSM may represent tree top canopy or building roofs. While a DSM may be useful for landscape modeling, city modeling and visualization applications, a DTM is often required for flood or drainage modeling, land-use studies, geological applications, and other applications, and in planetary science. Terminology There is no universal usage of the terms ''digital elevation model'' (DEM), ''digital terrain model'' (DTM) and ''digital surface model'' (DSM) in scientific literature. In most cases the term ''digital ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Discrete Element Method
A discrete element method (DEM), also called a distinct element method, is any of a family of numerical methods for computing the motion and effect of a large number of small particles. Though DEM is very closely related to molecular dynamics, the method is generally distinguished by its inclusion of rotational degrees-of-freedom as well as stateful contact and often complicated geometries (including polyhedra). With advances in computing power and numerical algorithms for nearest neighbor sorting, it has become possible to numerically simulate millions of particles on a single processor. Today DEM is becoming widely accepted as an effective method of addressing engineering problems in granular and discontinuous materials, especially in granular flows, powder mechanics, and rock mechanics. DEM has been extended into the Extended Discrete Element Method taking heat transfer, chemical reaction and coupling to CFD and FEM into account. Discrete element methods are relatively com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Democrats (Brazil)
The Democrats ( pt, Democratas, DEM) was a centre-right political party in Brazil that merged with the Social Liberal Party to found the Brazil Union in 2021. It was founded in 1985 under the name of Liberal Front Party (''Partido da Frente Liberal'', PFL) from a dissidence of the defunct Democratic Social Party (PDS), successor to the National Renewal Alliance (ARENA), the official party during the military dictatorship of 1964–1985. It changed to its current name in 2007. The original name reflected the party's support of free market policies,"Liberal Front Party (PFL)" . rather than the identification with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USGS DEM
The USGS DEM standard is a geospatial file format developed by the United States Geological Survey for storing a raster-based digital elevation model. It is an open standard, and is used throughout the world. It has been superseded by the USGS's own SDTS format but the format remains popular due to large numbers of legacy files, self-containment, relatively simple field structure and broad, mature software support. DEM Level A USGS DEM can be classified into one of four levels of quality. This is due to the multiple methods of data collection, and certainty in the data. Format Structure The USGS DEM format is a self-contained (single file) set of ASCII-encoded (text) 1024-byte (1024 ASCII chars) blocks that fall into three record categories called A, B, and C. There is no cross-platform ambiguity since line ending control codes are not used, and all data including numbers is represented in readable text form. There is no known binary analogue of the format, although it is common ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diffuse Element Method
In numerical analysis the diffuse element method (DEM) or simply diffuse approximation is a meshfree method. The diffuse element method was developed by B. Nayroles, G. Touzot and Pierre Villon at the Universite de Technologie de Compiegne, in 1992. It is in concept rather similar to the much older smoothed particle hydrodynamics. In the paper they describe a "diffuse approximation method", a method for function approximation from a given set of points. In fact the method boils down to the well-known moving least squares for the particular case of a global approximation (using all available data points). Using this function approximation method, partial differential equations and thus fluid dynamic problems can be solved. For this, they coined the term diffuse element method (DEM). Advantages over finite element methods are that DEM doesn't rely on a grid, and is more precise in the evaluation of the derivatives of the reconstructed functions. See also * Computational fluid dyn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Display Encode Mode
Video Code Engine (VCE, was earlier referred to as Video Coding Engine, Video Compression Engine or Video Codec Engine in official AMD documentation) is AMD's video encoding application-specific integrated circuit implementing the video codec H.264/MPEG-4 AVC. Since 2012 it was integrated into all of their GPUs and APUs except Oland. VCE was introduced with the Radeon HD 7000 Series on 22 December 2011. VCE occupies a considerable amount of the die surface at the time of its introduction and is not to be confused with AMD's Unified Video Decoder (UVD). As of AMD Raven Ridge (released January 2018), UVD and VCE were succeeded by Video Core Next (VCN). Overview The handling of video data involves computation of data compression algorithms and possibly of video processing algorithms. As the template compression methods shows, lossy video compression algorithms involve the steps: motion estimation (ME), discrete cosine transform (DCT), and entropy encoding (EC). AMD Video Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Julia Set
In the context of complex dynamics, a branch of mathematics, the Julia set and the Fatou set are two complementary sets (Julia "laces" and Fatou "dusts") defined from a function. Informally, the Fatou set of the function consists of values with the property that all nearby values behave similarly under repeated iteration of the function, and the Julia set consists of values such that an arbitrarily small perturbation can cause drastic changes in the sequence of iterated function values. Thus the behavior of the function on the Fatou set is "regular", while on the Julia set its behavior is "chaotic". The Julia set of a function is commonly denoted \operatorname(f), and the Fatou set is denoted \operatorname(f). These sets are named after the French mathematicians Gaston Julia and Pierre Fatou whose work began the study of complex dynamics during the early 20th century. Formal definition Let f(z) be a non-constant holomorphic function from the Riemann sphere o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ISO 4217
ISO 4217 is a standard published by the International Organization for Standardization (ISO) that defines alpha codes and numeric codes for the representation of currencies and provides information about the relationships between individual currencies and their minor units. This data is published in three tables: * Table A.1 – ''Current currency & funds code list'' * Table A.2 – ''Current funds codes'' * Table A.3 – ''List of codes for historic denominations of currencies & funds'' The first edition of ISO 4217 was published in 1978. The tables, history and ongoing discussion are maintained by SIX Group on behalf of ISO and the Swiss Association for Standardization. The ISO 4217 code list is used in banking and business globally. In many countries, the ISO 4217 alpha codes for the more common currencies are so well known publicly that exchange rates published in newspapers or posted in banks use only these to delineate the currencies, instead of transl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Democratic Party (United States)
The Democratic Party is one of the two major contemporary political parties in the United States. Founded in 1828, it was predominantly built by Martin Van Buren, who assembled a wide cadre of politicians in every state behind war hero Andrew Jackson, making it the world's oldest active political party.M. Philip Lucas, "Martin Van Buren as Party Leader and at Andrew Jackson's Right Hand." in ''A Companion to the Antebellum Presidents 1837–1861'' (2014): 107–129."The Democratic Party, founded in 1828, is the world's oldest political party" states Its main political rival has been the Republican Party since the 1850s. The party is a big tent, and though it is often described as liberal, it is less ideologically uniform than the Republican Party (with major individuals within it frequently holding widely different political views) due to the broader list of unique voting blocs that compose it. The historical predecessor of the Democratic Party is considered to be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Demonstrative
Demonstratives ( abbreviated ) are words, such as ''this'' and ''that'', used to indicate which entities are being referred to and to distinguish those entities from others. They are typically deictic; their meaning depending on a particular frame of reference and cannot be understood without context. Demonstratives are often used in spatial deixis (where the speaker or sometimes the listener are to provide context), but also in intra-discourse reference (including abstract concepts) or anaphora, where the meaning is dependent on something other than the relative physical location of the speaker, for example whether something is currently being said or was said earlier. Demonstrative constructions include demonstrative adjectives or demonstrative determiners, which qualify nouns (as in ''Put that coat on''); and demonstrative pronouns, which stand independently (as in ''Put that on''). The demonstratives in English are ''this'', ''that'', ''these'', ''those'', and the archaic ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diethyl Malonate
Diethyl malonate, also known as DEM, is the diethyl ester of malonic acid. It occurs naturally in grapes and strawberries as a colourless liquid with an apple-like odour, and is used in perfumes. It is also used to synthesize other compounds such as barbiturates, artificial flavourings, vitamin B1, and vitamin B6. Structure and properties Malonic acid is a rather simple dicarboxylic acid, with two the carboxyl groups close together. In forming diethyl malonate from malonic acid, the hydroxyl group (−OH) on both of the carboxyl groups is replaced by an ethoxy group (−OEt; −OCH2CH3). The methylene group (−CH2−) in the middle of the malonic part of the diethyl malonate molecule is neighboured by two carbonyl groups (−C(=O)−). The hydrogen atoms on the carbon adjacent to the carbonyl group in a molecule is significantly more acidic than hydrogen atoms on a carbon adjacent to alkyl groups (up to 30 orders of magnitude). (This is known as the α position with res ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deutsche Mark
The Deutsche Mark (; English: ''German mark''), abbreviated "DM" or "D-Mark" (), was the official currency of West Germany from 1948 until 1990 and later the unified Germany from 1990 until the adoption of the euro in 2002. In English, it was typically called the "Deutschmark" (). One Deutsche Mark was divided into 100 pfennigs. It was first issued under Allied occupation in 1948 to replace the Reichsmark and served as the Federal Republic of Germany's official currency from its founding the following year. On 31 December 1998, the Council of the European Union fixed the irrevocable exchange rate, effective 1 January 1999, for German mark to euros as DM 1.95583 = €1. In 1999, the Deutsche Mark was replaced by the euro; its coins and banknotes remained in circulation, defined in terms of euros, until the introduction of euro notes and coins on 1 January 2002. The Deutsche Mark ceased to be legal tender immediately upon the introduction of the euro—in contrast to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
