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LDA World
LDA may refer to: Aviation *Localizer type directional aid, an instrument approach to an airport *Landing distance available, the length of runway that is available for the ground run of an airplane landing Law *Legal document assistant, a non-lawyer authorized to assist with the preparation of legal instruments * Lobbying Disclosure Act of 1995, legislation in the United States *Legal drinking age, the minimum age at which one can legally consume alcohol Medicine * Left-displaced abomasum, condition of ruminants *Low dose allergens, a variant of enzyme potentiated desensitization Science and technology * Laser Doppler anemometry, technique to measure velocity *Latent Dirichlet allocation, a generative statistical model * Linear diode array, used for digitizing x-ray images *Linear discriminant analysis, a type of statistical analysis *Lithium diisopropylamide, a strong base in chemistry *Local delivery agent, software that delivers e-mail messages *Local-density approximation, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Localizer Type Directional Aid
A localizer type directional aid (LDA) or Instrument Guidance System (IGS) is a type of localizer-based instrument approach to an airport. It is used in places where, due to terrain and other factors, the localizer antenna array is not aligned with the runway it serves. In these cases, the localizer antenna array may be offset (i.e. pointed or aimed) in such a way that the approach course it projects no longer lies along the extended runway centerline (which is the norm for non-offset and non-LDA localizer systems). If the angle of offset is three degrees or less, the facility is classified as an offset localizer. If the offset angle is greater than three degrees, the facility is classified as a localizer-type directional aid (LDA). Straight-in approaches may be published if the offset angle does not exceed 30 degrees. Only circling minimums are published for offset angles greater than 30 degrees. As a "directional aid", and only a Category I (CAT I) approach, rather than a full-fl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lithium Diisopropylamide
Lithium diisopropylamide (commonly abbreviated LDA) is a chemical compound with the molecular formula . It is used as a strong base and has been widely utilized due to its good solubility in non-polar organic solvents and non-nucleophilic nature. It is a colorless solid, but is usually generated and observed only in solution. It was first prepared by Hamell and Levine in 1950 along with several other hindered lithium diorganylamides to effect the deprotonation of esters at the α position without attack of the carbonyl group. Preparation and structure LDA is commonly formed by treating a cooled (0 to −78 °C) mixture of tetrahydrofuran and diisopropylamine with ''n''-butyllithium. When dissociated, the diisopropylamide anion can become protonated to form diisopropylamine. Diisopropylamine has a p''K''a value of 36. Therefore, its conjugate base is suitable for the deprotonation of compounds with greater acidity, importantly, such weakly acidic compounds (carbon acids) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
London Development Agency
The London Development Agency (LDA) was from July 2000 until 2012 the regional development agency for the London region in England. A functional body of the Greater London Authority, its purpose was to drive sustainable economic growth within London. Projects were inherited from English Partnerships or carried out in collaboration with the Greater London Authority and other public sector organisations, including the Department for International Development, the British Council, and London College of Fashion, alongside London boroughs. Members of the Greater London Authority commissionea 2008 report on these projects The agency was closed on 31 March 2012 as a result of the |
London Democratic Association
The East London Democratic Association (ELDA) was founded in January 1837 by George Julian Harney in opposition to the LWMA, later supported by James Bronterre O'Brien and Feargus O'Connor Feargus Edward O'Connor (18 July 1796 – 30 August 1855) was an Irish Chartist leader and advocate of the Land Plan, which sought to provide smallholdings for the labouring classes. A highly charismatic figure, O'Connor was admired for his .... In April 1838 ELDA was reconstituted as the London Democratic Association (LDA) with an eight-point resolution covering the Charter and more. Closely allied with the northern Chartists, by the end of 1838, the LDA had branches meeting in public houses within the City, Tower Hamlets and Southwark in addition to the regular meeting held at the Trades Hall, Bethnal Green. During its active period, the LDA attracted the largest membership of any early metropolitan Chartist organisation (a little over 3,000 members).{{cite book , last = Chase ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liga Deportiva Alajuelense
Liga Deportiva Alajuelense (LDA, ), commonly known as Alajuelense and nicknamed La Liga (), is a Costa Rican multisport club based in the borough of El Llano, Alajuela, Alajuela province. Although they compete in a number of different sports, Alajuelense is mostly known for its association football team. It plays in the Primera División de Costa Rica, the top tier of the Football in Costa Rica, Costa Rican football league system. Alajuelense is one of two clubs to have List of unrelegated association football clubs, never been relegated, along with Club Sport Herediano, Herediano. Alajuelense was founded on the former Paris Hall, west of Alajuela's Central Park, on June 18, 1919, by six former players of a historic city club, ''Once de Abril'', with the intention of uniting all the sportsmen and associations present at that time in Alajuela under a single banner. However, it wouldn't be until 1928 when Alajuelense managed to become national champions for the first time in a seaso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lahore Development Authority
Lahore Development Authority (LDA) is responsible for new planned development in Lahore, Pakistan. It also regulates and issues permits for new construction and housing projects, private houses, and commercial development. It also manages Lahore's parks and green areas. Its website states that it plans on making Lahore "one of the thirty leading educational, cultural, commercial, industrial, and information technology centres of the world by 2020". History The Provincial Assembly of Punjab established the Lahore Development Authority under the LDA Act of 1975. It had previously been called the "Lahore Improvement Trust". On 9 May 2013, five days after International Firefighters' Day, the LDA Plaza building in central Lahore caught fire, killing 25 people. The fire started on the seventh floor, and media coverage revealed people jumping out of the building to their death. The fire highlighted the irrelevance of fire safety regulations, considering the fact that the very agency ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lobate Debris Apron
Lobate debris aprons (LDAs) are geological features on Mars, first seen by the Viking Orbiters, consisting of piles of rock debris below cliffs. These features have a convex topography and a gentle slope from cliffs or escarpments, which suggest flow away from the steep source cliff. In addition, lobate debris aprons can show surface lineations as do rock glaciers on the Earth. File:Wikictxp13clifflda.jpg, alt=Wide view of mesa with CTX showing Cliff face and location of lobate debris apron (LDA) Location is Ismenius Lacus quadrangle., Wide view of mesa with CTX showing cliff face and location of lobate debris apron (LDA) Location is Ismenius Lacus quadrangle. File:Wikifretesp 028313 2220cliff.jpg, Enlargement of previous CTX image of mesa This image shows the cliff face and detail in the LDA. Image taken with HiRISE under HiWish program. Location is Ismenius Lacus quadrangle. File:Wikildaf03 036777 2287.jpg, alt=Lobate debris aprons (LDAs) around a mesa, as seen by CTX. Mesa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Low Density Amorphous Ice
Amorphous ice (non-crystalline or "vitreous" ice) is an amorphous solid form of water. Common ice is a crystalline material wherein the molecules are regularly arranged in a hexagonal lattice, whereas amorphous ice has a lack of long-range order in its molecular arrangement. Amorphous ice is produced either by rapid cooling of liquid water (so the molecules do not have enough time to form a crystal lattice), or by compressing ordinary ice at low temperatures. Although almost all water ice on Earth is the familiar crystalline ice Ih, amorphous ice dominates in the depths of interstellar medium, making this likely the most common structure for H2O in the universe at large. Just as there are many different crystalline forms of ice (currently more than seventeen are known), there are also different forms of amorphous ice, distinguished principally by their densities. Formation The production of amorphous ice hinges on the fast rate of cooling. Liquid water must be cooled to its ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Local-density Approximation
Local-density approximations (LDA) are a class of approximations to the exchange–correlation (XC) energy functional in density functional theory (DFT) that depend solely upon the value of the electronic density at each point in space (and not, for example, derivatives of the density or the Kohn–Sham orbitals). Many approaches can yield local approximations to the XC energy. However, overwhelmingly successful local approximations are those that have been derived from the homogeneous electron gas (HEG) model. In this regard, LDA is generally synonymous with functionals based on the HEG approximation, which are then applied to realistic systems (molecules and solids). In general, for a spin-unpolarized system, a local-density approximation for the exchange-correlation energy is written as :E_^rho= \int \rho(\mathbf)\epsilon_(\rho(\mathbf))\ \mathrm\mathbf\ , where ''ρ'' is the electronic density and ''ε''xc is the exchange-correlation energy per particle of a homogeneous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Local Delivery Agent
A message delivery agent (MDA), or mail delivery agent, is a computer software component that is responsible for the delivery of e-mail messages to a local recipient's mailbox., ''Internet Mail Architecture'', D. Crocker (July 2009) It is also called a local delivery agent (LDA). Within the Internet mail architecture, local message delivery is achieved through a process of handling messages from the message transfer agent, and storing mail into the recipient's environment (typically a mailbox). Implementation Many mail handling software products bundle multiple message delivery agents with the message transfer agent component, providing for site customization of the specifics of mail delivery to a user. Unix On Unix-like systems, procmail and maildrop are the most popular MDAs. The Local Mail Transfer Protocol (LMTP) is a protocol that is frequently implemented by network-aware MDAs. Invocation The mail delivery agent is generally not started from the command line, but i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linear Discriminant Analysis
Linear discriminant analysis (LDA), normal discriminant analysis (NDA), or discriminant function analysis is a generalization of Fisher's linear discriminant, a method used in statistics and other fields, to find a linear combination of features that characterizes or separates two or more classes of objects or events. The resulting combination may be used as a linear classifier, or, more commonly, for dimensionality reduction before later classification. LDA is closely related to analysis of variance (ANOVA) and regression analysis, which also attempt to express one dependent variable as a linear combination of other features or measurements. However, ANOVA uses categorical independent variables and a continuous dependent variable, whereas discriminant analysis has continuous independent variables and a categorical dependent variable (''i.e.'' the class label). Logistic regression and probit regression are more similar to LDA than ANOVA is, as they also explain a categorical var ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landing Distance Available
According to the International Civil Aviation Organization (ICAO), a runway is a "defined rectangular area on a land aerodrome prepared for the landing and takeoff of aircraft". Runways may be a man-made surface (often asphalt, concrete, or a mixture of both) or a natural surface (grass, dirt, gravel, ice, sand or salt). Runways, as well as taxiways and ramps, are sometimes referred to as "tarmac", though very few runways are built using tarmac. Takeoff and landing areas defined on the surface of water for seaplanes are generally referred to as waterways. Runway lengths are now commonly given in meters worldwide, except in North America where feet are commonly used. History In 1916, in a World War I war effort context, the first concrete-paved runway was built in Clermont-Ferrand in France, allowing local company Michelin to manufacture Bréguet Aviation military aircraft. In January 1919, aviation pioneer Orville Wright underlined the need for "distinctly marked and c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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