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ERF Radio
Erf or ERF may refer to: Industry * Enerplus, a North American energy producer whose stock is listed as ERF under the TSX and NYSE * ERF (truck manufacturer), a former British truck manufacturer Mathematics * Error function, erf * Exponential response formula Science and technology * ERF (gene), coding for ETS domain-containing transcription factor * Electrorheological fluid * Eukaryotic release factors * Event-related field Other uses * Erf (law), in real estate law * Erf (river), in Germany * Estuarine Research Federation, an American environmental organization * Erfurt-Weimar Airport, in Germany (IATA code) * European Racquetball Federation * European Refugee Fund * Extreme Reaction Force, in United States military prisons * Reformed Church of France The Reformed Church of France (french: Église réformée de France, ERF) was the main Protestant denomination in France with a Calvinist orientation that could be traced back directly to John Calvin. In 2013, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Enerplus
Enerplus Corporation is one of Canada’s largest independent oil and gas producers. The company holds oil and natural gas property interest in the United States and in western Canada, in the provinces of Alberta, British Columbia and Saskatchewan. The company is based out of Calgary, Alberta and trades on both the Toronto Stock Exchange and the New York Stock Exchange. It was Canada's first income trust. History Enerplus was established in 1986 by Marcel Tremblay, a pension fund manager and John Brussa, a lawyer. It was originally called Enerplus Resources Fund, and it was Canada's first income trust. Its original purpose was to provide income from mature, aging oil and gas assets to retail investors, taking advantage of the tax advantages of the income trust structure. It started trading on the Toronto Stock Exchange in 1986 with a $10 million IPO. In 1996, Mark Resources renamed itself Enermark, became an income trust, and joined the Enerplus group of companies. This w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ERF (truck Manufacturer)
ERF was a British truck manufacturer established in 1933 by Edwin Richard Foden, from whose initials the company was named. Its factory in Middlewich closed in March 2002, and it was discontinued as a marque by owner MAN in July 2007. History In 1881, the first Foden traction engine was built in Sandbach. Then in 1898, Edwin Richard Foden influenced future truck design by designing the first steam wagon running on steel tyre wheels, which had been successful until 1913, when vulcanised solid-rubber tyre development had advanced to the stage of allowing their fitment on heavy vehicles. Edwin introduced the first pneumatic-tyred Foden steam wagon, but as steam transport appeared to be going out of favour, Edwin turned his attention to the development of a 6- to 8-ton chassis fitted with new Gardner LW (Light Weight) high-speed oil engine. At the beginning of the 1930s, Britain's industry was struggling to survive the worst recession in many years, and unemployment exceeded ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Error Function
In mathematics, the error function (also called the Gauss error function), often denoted by , is a complex function of a complex variable defined as: :\operatorname z = \frac\int_0^z e^\,\mathrm dt. This integral is a special (non-elementary) sigmoid function that occurs often in probability, statistics, and partial differential equations. In many of these applications, the function argument is a real number. If the function argument is real, then the function value is also real. In statistics, for non-negative values of , the error function has the following interpretation: for a random variable that is normally distributed with mean 0 and standard deviation , is the probability that falls in the range . Two closely related functions are the complementary error function () defined as :\operatorname z = 1 - \operatorname z, and the imaginary error function () defined as :\operatorname z = -i\operatorname iz, where is the imaginary unit Name The name "error function ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exponential Response Formula
In mathematics, the exponential response formula (ERF), also known as exponential response and complex replacement, is a method used to find a particular solution of a non-homogeneous linear ordinary differential equation of any order. The exponential response formula is applicable to non-homogeneous linear ordinary differential equations with constant coefficients if the function is polynomial, sinusoidal, exponential or the combination of the three. The general solution of a non-homogeneous linear ordinary differential equation is a superposition of the general solution of the associated homogeneous ODE and a particular solution to the non-homogeneous ODE. Alternative methods for solving ordinary differential equations of higher order are method of undetermined coefficients and method of variation of parameters. Context and method Applicability The ERF method of finding a particular solution of a non-homogeneous differential equation is applicable if the non-homogeneous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ERF (gene)
ETS domain-containing transcription factor ERF is a protein that in humans is encoded by the ''ERF'' gene In biology, the word gene (from , ; "... Wilhelm Johannsen coined the word gene to describe the Mendelian units of heredity..." meaning ''generation'' or ''birth'' or ''gender'') can have several different meanings. The Mendelian gene is a b .... References Further reading * * * * * * * * * * * * External links * Transcription factors {{gene-19-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrorheological Fluid
Electrorheological (ER) fluids are suspensions of extremely fine non-conducting but electrically active particles (up to 50 micrometres diameter) in an electrically insulating fluid. The apparent viscosity of these fluids changes reversibly by an order of up to 100,000 in response to an electric field. For example, a typical ER fluid can go from the consistency of a liquid to that of a gel, and back, with response times on the order of milliseconds. The effect is sometimes called the Winslow effect after its discoverer, the American inventor Willis Winslow, who obtained a US patent on the effect in 1947 and wrote an article published in 1949. The ER effect The change in apparent viscosity is dependent on the applied electric field, i.e. the potential divided by the distance between the plates. The change is not a simple change in viscosity, hence these fluids are now known as ER fluids, rather than by the older term Electro Viscous fluids. The effect is better described as a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eukaryotic Release Factors
A release factor is a protein that allows for the termination of translation by recognizing the termination codon or stop codon in an mRNA sequence. They are named so because they release new peptides from the ribosome. Background During translation of mRNA, most codons are recognized by "charged" tRNA molecules, called aminoacyl-tRNAs because they are adhered to specific amino acids corresponding to each tRNA's anticodon. In the standard genetic code, there are three mRNA stop codons: UAG ("amber"), UAA ("ochre"), and UGA ("opal" or "umber"). Although these stop codons are triplets just like ordinary codons, they are not decoded by tRNAs. It was discovered by Mario Capecchi in 1967 that, instead, tRNAs do not ordinarily recognize stop codons at all, and that what he named "release factor" was not a tRNA molecule but a protein. Later, it was demonstrated that different release factors recognize different stop codons. Classification There are two classes of release factor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Event-related Field
An event-related potential (ERP) is the measured brain response that is the direct result of a specific sensory, cognitive, or motor event. More formally, it is any stereotyped electrophysiological response to a stimulus. The study of the brain in this way provides a noninvasive means of evaluating brain functioning. ERPs are measured by means of electroencephalography (EEG). The magnetoencephalography (MEG) equivalent of ERP is the ERF, or event-related field. Evoked potentials and induced potentials are subtypes of ERPs. History With the discovery of the electroencephalogram (EEG) in 1924, Hans Berger revealed that one could measure the electrical activity of the human brain by placing electrodes on the scalp and amplifying the signal. Changes in voltage can then be plotted over a period of time. He observed that the voltages could be influenced by external events that stimulated the senses. The EEG proved to be a useful source in recording brain activity over the ensuin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erf (law)
In real estate, an erf (pl. erven) is the legal term used in Namibia, South Africa and Eswatini to describe a piece of land registered in a deeds registry as an erf, lot, plot or stand. The term is of Afrikaans origin. Section 102 of the South African Deeds Registries Act, 1937 provides the following definition: Section 1 of the Namibian Deeds Registries Act, 2015 (Act No. 14 of 2015) gives an identical definition. See also * South African property law * Township (South Africa) In South Africa, the terms township and location usually refer to the often underdeveloped racially segregated urban areas that, from the late 19th century until the end of apartheid, were reserved for non-whites, namely Black Africans, Co ... References {{Reflist Real property law Law of Namibia Law of South Africa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erf (river)
Erf is a river of Bavaria and Baden-Württemberg, Germany. In Baden-Württemberg, it is called Erfa. It flows into the Main in Bürgstadt. See also *List of rivers of Baden-Württemberg *List of rivers of Bavaria A list of rivers of Bavaria, Germany: A * Aalbach *Abens * Ach * Afferbach * Affinger Bach * Ailsbach *Aisch * Aiterach *Alpbach *Alster * Altmühl *Alz * Amper * Anlauter * Arbach * Arbachgraben *Aschaff * Aschbach * Attel * Aubach, tributary of ... References Rivers of Baden-Württemberg Rivers of Bavaria Rivers of Germany {{Bavaria-river-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Estuarine Research Federation
The Coastal and Estuarine Research Federation (CERF) is a private, nonprofit organization that was created in 1971. At that time, the members of two regionally based organizations, the Atlantic Estuarine Research Society (AERS) and the New England Estuarine Research Society (NEERS) recognized the need for a third estuarine organization that would address national (now worldwide) estuarine and coastal issues. Today, CERF is a multidisciplinary federation of members and seven regionally based affiliate societies dedicated to the understanding and wise stewardship of estuaries and coasts worldwide. Mission CERF advances understanding and wise stewardship of estuarine and coastal ecosystems worldwide. Its mission is to: https://www.cerf.science/about-us *Promote research in estuarine and coastal ecosystems *Support education of scientists, decision-makers and the public *Facilitate communication among these groups Membership in CERF is open to all who support these goals. The Fede ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
