|
Aggregation Websites
Aggregation may refer to: Business and economics * Aggregation problem (economics) * Purchasing aggregation, the joining of multiple purchasers in a group purchasing organization to increase their buying power * Community Choice Aggregation, the joining of geographically contiguous communities to bypass a conventional energy utility monopoly and seek a greener energy service Computer science and telecommunication * Aggregate function, a type of function in data processing * Aggregation, a form of object composition in object-oriented programming * Link aggregation, using multiple Ethernet network cables/ports in parallel to increase link speed * Packet aggregation, joining multiple data packets for transmission as a single unit to increase network efficiency * Route aggregation, the process of forming a supernet in computer networking * Aggregation, a process by which Australian country television markets were combined in the late 1980s and 1990s; see Regional television in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aggregation Problem
In economics, an ''aggregate'' is a summary measure. It replaces a vector that is composed of many real numbers by a single real number, or a scalar. Consequently, there occur various problems that are inherent in the formulations that use aggregated variables.Franklin M. Fisher (1987). "aggregation problem," '' The New Palgrave: A Dictionary of Economics'', v. 1, pp.53-55 The aggregation problem is the problem of finding a valid way to treat an empirical or theoretical aggregate as if it reacted like a less-aggregated measure, say, about behavior of an individual agent as described in general microeconomic theory (see representative agent and heterogeneity in economics). The second meaning of "aggregation problem" is the theoretical difficulty in using and treating laws and theorems that include aggregate variables. A typical example is the aggregate production function. Another famous problem is Sonnenschein-Mantel-Debreu theorem. Most of macroeconomic statements comp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platelet
Platelets or thrombocytes () are a part of blood whose function (along with the coagulation#Coagulation factors, coagulation factors) is to react to bleeding from blood vessel injury by clumping to form a thrombus, blood clot. Platelets have no cell nucleus; they are fragments of cytoplasm from megakaryocytes which reside in bone marrow or Lung, lung tissue, and then enter the circulation. Platelets are found only in mammals, whereas in other vertebrates (e.g. birds, amphibians), thrombocytes circulate as intact agranulocyte, mononuclear cells. One major function of platelets is to contribute to hemostasis: the process of stopping bleeding at the site where the lining of vessels (endothelium) has been interrupted. Platelets gather at the site and, unless the interruption is physically too large, they plug the hole. First, platelets attach to substances outside the interrupted endothelium: ''adhesion (medicine), adhesion''. Second, they change shape, turn on receptors and secret ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agrégation
In France, the () is the most competitive and prestigious examination for civil service in the French public education A state school, public school, or government school is a primary school, primary or secondary school that educates all students without charge. They are funded in whole or in part by taxation and operated by the government of the state. State-f ... system. Successful candidates become ''professeurs agrégés'' () and are usually appointed as teachers in Secondary education in France, secondary schools or Classe préparatoire aux grandes écoles, preparatory classes, or as lecturers in universities. Context Originating from the 18th century, the is a highly prestigious and competitive examination. The level of selectivity varies between disciplines: every year, the French Ministry of National Education (France), Ministry of National Education determines and publishes a list of annual quotas for each discipline. There are about 300 to 400 positions open each ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aggregator (other)
Aggregator may refer to: * Job ads aggregator, a website that aggregates job ads from various job boards, multiposter sites, as well as from direct employers and recruiting agencies *News aggregator, software or a website that aggregates news or other content from various sources *Poll aggregator, a website that aggregates polling data to gauge public sentiment on key political issues or to measure likely support for a candidate or party in an upcoming election. *Review aggregator, a website that aggregates reviews of movies or other products or services * Search aggregator, software that aggregates search results from various search engines *Social network aggregation, the collection of content from multiple social network services * Video aggregator, a website that aggregates online videos from various sources See also *Aggregate (other) Aggregate or aggregates may refer to: Computing and mathematics * Aggregate (data warehouse), a part of the dimensional model that is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aggregate (other)
Aggregate or aggregates may refer to: Computing and mathematics * Aggregate (data warehouse), a part of the dimensional model that is used to speed up query time by summarizing tables * Aggregate analysis, a technique used in amortized analysis in computer science, especially in analysis of algorithms * C++ classes#Aggregate classes, Aggregate class, a type of class supported by C++ * Aggregate data, in statistics, data combined from several measurements * Aggregate function, aggregation function, in database management is a function wherein the values of multiple rows are grouped together to form a single summary value * Aggregate Level Simulation Protocol (ALSP), a protocol and supporting software that enables simulations to interoperate with one another * Domain-driven_design#aggregate_root, Aggregate root, a concept in the Domain-driven Design software development process * Aggregate Server Access Protocol, used by the Reliable server pooling (RSerPool) framework * Aggregate th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aggregation (magazine)
''Aggregation'' was a Canadian online magazine published between 2010 and 2012. Each issue collected together stories and trends from five contributors based on hyperlinks they'd discover on the web. It was one of the first Canadian publications designed exclusively for Apple's iPad. ''Aggregation'' was conceived and published by Gary Campbell. It was released online, for free, on the 15th of the month for six consecutive months, from November 2010 to April 2011. After an eight-month hiatus, Campbell announced that a seventh issue was in the works. That issue was eventually published in August 2012 while Campbell was living in New York City. There has been no indication whether more issues are forthcoming. Each magazine cover featured a unique piece of interactive artwork by Campbell. The publication's design often took advantage of the multimedia nature of tablets by including touch-sensitive and video elements. Each issue's contributors were paid for their work through an hono ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aggregation (linguistics)
In linguistics, aggregation is a subtask of natural language generation, which involves merging syntactic constituents (such as sentences and phrases) together. Sometimes aggregation can be done at a conceptual level. Examples A simple example of syntactic aggregation is merging the two sentences ''John went to the shop'' and ''John bought an apple'' into the single sentence ''John went to the shop and bought an apple''. Syntactic aggregation can be much more complex than this. For example, aggregation can embed one of the constituents in the other; e.g., we can aggregate ''John went to the shop'' and ''The shop was closed'' into the sentence ''John went to the shop, which was closed''. From a pragmatic perspective, aggregating sentences together often suggests to the reader that these sentences are related to each other. If this is not the case, the reader may be confused. For example, someone who reads ''John went to the shop and bought an apple'' may infer that the app ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protein Aggregation
In molecular biology, protein aggregation is a phenomenon in which intrinsically disordered proteins, intrinsically-disordered or mis-folded proteins aggregate (i.e., accumulate and clump together) either intra- or extracellularly. Protein aggregates have been implicated in a wide variety of diseases known as amyloidoses, including Amyotrophic lateral sclerosis, ALS, Alzheimer's, Parkinson's and prion disease. After synthesis, proteins typically Protein folding, fold into a particular Protein tertiary structure, three-dimensional conformation that is the most Thermodynamic equilibrium, thermodynamically favorable: their native state. This folding process is driven by the hydrophobic effect: a tendency for hydrophobic (water-fearing) portions of the protein to shield themselves from the hydrophilic (water-loving) environment of the cell by burying into the interior of the protein. Thus, the exterior of a protein is typically hydrophilic, whereas the interior is typically hydrophob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pheromone
A pheromone () is a secreted or excreted chemical factor that triggers a social response in members of the same species. Pheromones are chemicals capable of acting like hormones outside the body of the secreting individual, to affect the behavior of the receiving individuals. There are ''alarm signal, alarm pheromones'', ''food trail pheromones'', ''sex pheromones'', and many others that affect behavior or physiology. Pheromones are used by many organisms, from basic unicellular prokaryotes to complex multicellular eukaryotes. Their use among insects has been particularly well documented. In addition, some vertebrates, plants and ciliates communicate by using pheromones. The ecological functions and evolution of pheromones are a major topic of research in the field of chemical ecology. Background The portmanteau word "pheromone" was coined by Peter Karlson and Martin Lüscher in 1959, based on the Greek language, Greek () and (). Pheromones are also sometimes classified as ec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Overdispersion
In statistics, overdispersion is the presence of greater variability (statistical dispersion) in a data set than would be expected based on a given statistical model. A common task in applied statistics is choosing a parametric model to fit a given set of empirical observations. This necessitates an assessment of the fit of the chosen model. It is usually possible to choose the model parameters in such a way that the theoretical population mean of the model is approximately equal to the sample mean. However, especially for simple models with few parameters, theoretical predictions may not match empirical observations for higher moments. When the observed variance is higher than the variance of a theoretical model, overdispersion has occurred. Conversely, underdispersion means that there was less variation in the data than predicted. Overdispersion is a very common feature in applied data analysis because in practice, populations are frequently heterogeneous (non-uniform) contrary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flocculation
In colloidal chemistry, flocculation is a process by which colloidal particles come out of Suspension (chemistry), suspension to sediment in the form of floc or flake, either spontaneously or due to the addition of a clarifying agent. The action differs from Precipitation (chemistry), precipitation in that, prior to flocculation, colloids are merely suspended, under the form of a stable dispersion (where the internal phase (solid) is dispersed throughout the external phase (fluid) through mechanical agitation) and are not truly dissolved in Solution (chemistry), solution. Coagulation (water treatment), Coagulation and flocculation are important processes in fermentation and water treatment with coagulation aimed to destabilize and aggregate particles through chemical interactions between the coagulant and colloids, and flocculation to sediment the destabilized particles by causing their aggregation into floc. Term definition According to the IUPAC definition, flocculation is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Particle Aggregation
Particle agglomeration refers to the formation of assemblages in a suspension (chemistry), suspension and represents a mechanism leading to the functional destabilization of colloidal systems. During this process, particles dispersed in the liquid phase Cohesion (chemistry), stick to each other, and spontaneously form irregular particle assemblages, flocs, or agglomerates. This phenomenon is also referred to as coagulation (water treatment), coagulation or flocculation and such a suspension is also called ''unstable''. Particle agglomeration can be induced by adding salts or other chemicals referred to as Coagulation (water treatment), ''coagulant'' or ''flocculant''.M. Elimelech, J. Gregory, X. Jia, R. Williams, ''Particle Deposition and Aggregation: Measurement, Modelling and Simulation'', Butterworth-Heinemann, 1998. Particle agglomeration can be a reversible or irreversible process. Particle agglomerates defined as "hard agglomerates" are more difficult to redisperse to the i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
